Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
Attorney Ref: 1363P00ICA02
MANUALLY CONTROLLABLE LED CORRELATED
COLOR TEMPERATURE LIGHT FIXTURE
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
This invention relates to LED lighting units, and in particular to LED light
fixtures having
manually controllable correlated color temperature (CCT) to obtain different
correlated color
temperatures.
DESCRIPTION OF THE PRIOR ART
LED lamps incorporate light emitting diodes (LEDs) which are semiconductor
light
sources having a semiconductor diode and photo illuminescent material. An LED
is a diode
which permits the flow of electrical current in only one direction. In an LED,
there are two
conductive materials in contact with each other ¨ a positive or p-material,
and a negative or n-
material. When a p-material is in contact with an n-material, a single p-n
conductor is formed.
The atoms in the n-type material have extra electrons while the p-type
material has electron
deficiencies or holes. When the p-type and n-type material are close to each
other, the extra
electrons of the n-type material transmit its extra electrons to holes in the
p-type material. This
results in the release of photons. However, only those diodes which release
photons that are in
the visible part of the light spectrum emit light and those diodes are LEDs.
LED lights have become very popular because they last longer and use far less
electricity than incandescent bulbs. LED lights, particularly of the type
disclosed herein, generate
white light. White light is a combination of multiple wavelengths of light.
One way of
characterizing white light is by the use of color temperature. This means the
color of light within
the white light. CCT is a specification of color appearance of the light
emitted by a lamp. It
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relates to the color from a reference source which is heated to a particular
temperature, measured
in degrees Kelvin (K). The CCT rating of a lamp in general refers to the
warmth or coolness of
the lamp. CCT is basically a gauge of how blue or yellow the color of light
emitted from a source
of illumination appears. Lamps with a CCT rating below 3200K are considered
warm sources,
whereas those above 4000K are considered cool sources. The color temperature
of a light source
is the temperature of an ideal black-body radiator that radiates light of
comparable color to that
of the light source. As mentioned above, color temperatures over 4000K are
generally called cool
colors (bluish white), while lower temperatures (2700K-3000K) are referred to
as warm colors
(yellowish white through red).
LEDS are usually either indicator-type LEDs if they have low intensity, and
illuminator-type LEDs if they are high power devices that provide illumination
¨ as is the case in
the present invention. LEDS are classified in part according to their CCT. A
color difference has
a threshold at which it becomes observable based on an ellipse (called the
MacAdam ellipse)
over the color space so that the color at its center changes by a certain
amount at any particular
amount along its edge. The scale of this ellipse is referred to as the
standard deviation of color
matching or SDCM. A color difference of 2 SDCM is not readily visible. Color
differences are
intended to be small by light fixture manufacturers. LEDs are "binned" to
classify the LEDs so
that the CCTs of LED in a bin appear to be the same. The present invention
uses LEDs of
different CCTs; hence binning is significant.
Neutral white light is generally 4000K-4500K, direct sun is generally around
4800K,
day-white is 5000K-6000K, cool white is generally 7000K-7500K and blue sky is
considered to
be 10000K. LED downlights have become more and more popular. However, while
these lights
can be mass produced and easily affordable, it has been desirable to
incorporate easily operable,
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manual systems for controlling the CCT that is efficient, effective and
inexpensive.
It has also been found very useful to incorporate such lights in recessed cans
which
are installed in many residences, commercial buildings, hospitals, educational
institutions and the
like.
For LED lamp fixtures, it has been found desirable to use LEDs with various
CCTs
because of different tones of light desired.
For example, there have been various recommendations for CCTs for different
environments. With respect to restaurants, it is been recommended that high-
end restaurants use
warmer color temperatures from 1800K-2700K. Court-serve restaurants, warm, but
not as warm
as high-end restaurants, the recommendation is 2700K-3500K. For hotel lobbies,
a
recommendation in the 1800K-3000K range. For guest rooms in hotels, one
recommendation is
in the 2700K-3000K range to create a warm and inviting atmosphere. However, in
offices, a
recommendation is in the 3000K-4000K range to provide a neutral to cool color
temperature.
With respect to healthcare, such as in hospitals, cooler color temperatures
have been
recommended in the 3500K-5000K range. Of course, if a particular space is used
for different
purposes, it would be very advantageous to be able to change the CCT.
Moreover, different
individuals or groups of individuals may have their own personal preference
for a particular
range of CCTs. Thus. LED light fixtures with easily variable CCTs would be
most advantageous.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide an LED light fixture
having a manually
controllable CCT feature.
Another object is the provision of LED light fixtures including various
manually operable
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CCT switches including toggle switches, rotary switches, pull chain switches,
DIP switches,
push button switches and slide switches.
It is a further object of the present invention to provide improved CCT LED
light fixture of
modest cost with easily accessibly manually variable correlated color
temperatures.
It is also an additional object of the present invention to provide a manually
controllable
LED CCT light fixture having sets of LEDs wherein each set of LEDs has a
different CCT, and
the sets are arranged on a printed circuit board to yield a particular
arrangement of luminosity,
such as uniformly across the printed circuit board.
Another object of the present invention is to provide a manually controllable
CCT for a
recessed LED downlight.
It is a further object of the present invention to provide an LED downlight
which can easily
be installed in a recessed can, and which further has an easily accessible
manual switch for
controlling the correlated color temperature of the LED lamp.
A still further object of the present invention is to provide an economical,
recessed LED
light fixture incorporating an effective and efficient manually operable CCT
control switch.
It is yet another object of the present invention to provide a recessed LED
downlight which
is color tuneable, and which can be easily installed in a recessed can.
It is also an object of the present invention to provide an LED lighting
module which is
color tuneable and incorporates a manually variable CCT switch feature.
An additional object of the present invention is the provision of an LED fan
light kit that is
color tuneable and includes a manually operable CCT select switch.
It is yet a further object of the present invention to provide a flush-
mounted, color tuneable
LED light having a manually operated CCT select switch.
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It is also an object of the present invention to provide an electric fan
assembly including a
manually controllable CCT light kit.
Another object of the present invention is to provide a manually actuable CCT
select
switch in a light fixture which is not readily visible when the light fixture
is in an operative
position, but is easily rendered in an operable position for finger actuation.
Another related object of the invention is the provision of a compartment in a
light fixture
for holding a manually operable CCT select switch, which compartment is not
observable when
the cc"- select switch is not available for use.
A further object of the invention is to provide a concealment for hiding or
making less
obvious the manually actuable CCT switch assembly with respect to light
fixtures incorporating
the manually controllable CCT light fixture.
Another related object is the provision of a compartment for a CCT select
switch which
includes a closure such as a door for selectively holding the CCT select
switch in storage, which
door can be opened for access to the switch.
In a first aspect, this document discloses An LED light fixture comprising: at
least two
electrically operated LED light sources for emitting illumination, the
illumination of each of said
at least two LED light sources having different, predetermined correlated
color temperatures; and
an electric circuit connectable to an electric power source for supplying
electric power to one of
the group consisting of a selected one of said at least two LED light sources
and a selected
combination of said at least two LED light sources, said electrical circuit
comprising: a switching
circuit operable for connecting said selected one of the group consisting of a
selected one of said
at least two LED light sources, and said combination of said at least two LED
light sources, to said
electrical circuit to receive electrical current and emit illumination of a
predetermined correlated
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color temperature; a manually controllable correlated color temperature
switching assembly to
operate said switching circuit to connect said selected one of said group to
the electric power source
to effect the illumination of said selected one of said group of one of said
at least two LED sources
and a combination of said at least two LED light sources, said manually
controllable correlated
color temperature switching assembly including a digitally operated switch
actuating member for
actuating said manually controllable correlated color temperature switching
assembly; a switch
holding structure for holding for operation said digitally operated switch
actuating member; and a
concealment for concealing said switch holding structure to render said
digitally operated switch
actuating member inaccessible for operation, and for selectively rendering
said digitally operated
switch actuating member accessible for digital operation.
In a second aspect, this document discloses an LED light fixture comprising: a
housing
assembly; at least one printed circuit board operatively attached to said
housing assembly; at least
two sets of LED light sources mounted on said at least one printed circuit
board, each of said sets
of at least two LED light sources having a correlated color temperature
different from the
.. correlated color temperature of every other of said sets of LED light
sources; an electric circuit
operable to supply electricity to said at least two sets of LED light sources
wherein said electric
circuit comprises at least two subcircuits, each of said at least two
subcircuits including one of said
sets of LED light sources, said subcircuits being mounted on said at least one
printed circuit board;
and a manually controllable correlated color temperature switching assembly
including: a
manually controllable correlated color temperature switch selectively
connectable to one or a
combination of said at least two subcircuits to actuate the selected one of
the group consisting of
said at least two sets of LED light sources in said selected at least two
subcircuits and the selected
set of LED light sources in said combination of said at least two subcircuits;
and a digitally
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operable actuating member for making said selective connection of said
manually controllable
correlated color temperature switch; wherein said digitally operable actuating
member makes said
selective connection of said manually controllable correlated color
temperature switch.
In a third aspect, this document discloses an LED light fixture comprising: at
least two
groups of LEDs, each of said at least two groups of LEDs being electrically
coupled together for
emitting illumination of a particular correlated color temperature different
from the correlated
color temperature of said other of said at least two groups of LEDs in
response to receiving electric
power, at least a respective one of said LEDs being incorporated in at least
one of said at least two
groups of LEDs; electrical circuitry including at least three electrical
circuits, each of said at least
three electrical circuits including at least one group of said at least two
groups of LEDs and at least
one selected combination of said at least two groups of LEDs; electrical
switching components for
each of said at least three electrical circuits, said electrical switching
components being actuated
for connecting a selected one of the group consisting of said at least two
groups of LEDs and said
at least one selected combination of said at least two groups of LEDs in one
of said electrical
circuits to electrical power to effect the emission of illumination of at
least one of said at least three
values of correlated color temperatures; and a controllable correlated color
temperature switching
assembly to actuate a selected one of said electrical switching components to
connect a selected
group of one of said at least two groups of LEDs and said at least one
selected combination of said
at least two groups of LEDs to electrical power, to cause said selected group
of one of said at least
two groups of LEDs to emit illumination of the particular correlated color
temperature of said
selected group of one of said at least two groups of LEDs, said controllable
correlated color
temperature switching assembly including a digitally operated switch actuating
member for
actuating said controllable correlated color temperature switching assembly;
and a switch holding
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structure for holding for operation said digitally operated switch actuating
member.
In a fourth aspect, this document discloses an LED light fixture comprising: a
set of at least
two LED light sources, said set of at least two LED light sources being
respectively connected in
at least three electric circuits, each of said at least three electric
circuits effecting the generation of
illumination having a correlated color temperature different from the
correlated color temperature
emitted by the LED light sources in each of the others of said at least three
electric circuits; and a
controllable correlated color temperature switching assembly comprising a
manually controllable
correlated color temperature switch for selectively connecting one of said set
of at least two LED
light sources in a separate one of said at least three electric circuits, each
of said at least three
electric circuits having a correlated color temperature different from the
correlated color
temperature of the others of said at least three electric circuits, and
another of said set of at least
two LED light sources in a separate one of said at least three electric
circuits having a second
correlated color temperature different from the correlated color temperature
of each of the others
of said set of at least two LED light sources in any of said at least three
electric circuits, and a
combination of said set of at least two LED light sources in a separate one of
said at least three
electric circuits having a third correlated color temperature different from
the correlated color
temperature of each of the others of said LED light sources in any of the
other at least three electric
circuits; said manually controllable correlated color temperature switch being
concealed when said
LED light fixture is mounted for operation.
In a fifth aspect, this document discloses an LED light fixture comprising: a
set of LED light
sources for emitting illumination, at least two portions of said set of LED
light sources being
connected in at least three respective electric circuits, the LED light
sources in each of said at least
three respective electric circuits generating illumination having different
correlated color
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temperatures from each of the other of said at least three respective
electrical circuits; and a
switching circuit operable for connecting alternatively: a selected one of
said at least two portions
of said set of LED light sources in one of said at least three respective
circuits to generate
illumination of one correlated color temperature, and for respectively
connecting another of said
at least two portions of said set of LED light sources in another of said at
least three respective
electrical circuits to generate illumination of another of said correlated
color temperatures in
response to electric power being sent to said another of said at least three
respective circuits; and
a combination of said at least two portions of said set of LED light sources
in said respective
electric circuits to generate illumination of a correlated temperature
different from the correlated
color temperature of the illumination of the LED light sources in each of the
other of said at least
three electric circuits; and a correlated color temperature switching assembly
to operate said
switching circuit to connect a selected one of the group consisting of a
selected one of said at least
two portions of said set of LED light sources and said selected combination of
said at least two
portions of said set of LED light sources in said respective electric circuits
to an electric power
source, to effect the illumination of said LED light sources in said selected
one of said group
consisting of a selected one of said at least two portions of said set of LED
light sources to effect
the illumination of LED light sources in said selected one of said group
consisting of a selected
one of said at least two portions of said LED light sources.
In a sixth aspect, this document discloses an LED light fixture comprising: at
least two
electrically operated LED light sources for emitting illumination, the
illumination of each of said
at least two LED light sources having different, predetermined correlated
color temperatures;
an electric circuit connectable to an electric power source for supplying
electric power to one of
the group consisting of a selected one of said at least two LED light sources
and a selected
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combination of said at least two LED light sources, said electric circuit
comprising: a switching
circuit operable for connecting said selected one of the group consisting of a
selected one of said
at least two LED light sources and said combination of said at least two LED
light sources, to said
electric circuit to receive electrical current and emit illumination of a
predetermined correlated
color temperature; a manually controllable correlated color temperature
switching assembly to
operate said switching circuit to connect said selected one of said group
consisting of a selected
one of said at least two light sources and said combination of said at least
two LED light sources,
to the electric power source to effect the illumination of said selected one
of said groups consisting
of a selected one of said at least two LED sources and said combination of
said at least two LED
light sources, said manually controllable correlated color temperature
switching assembly
including a digitally operated switch actuating member for actuating said
manually controllable
correlated color temperature switching assembly; and
a switch holding structure for holding for operation said digitally operated
switch actuating
member.
In a seventh aspect, this document discloses an LED light fixture comprising:
a housing
assembly; at least one printed circuit board operatively attached to said
housing assembly; at least
two sets of LED light sources mounted on said at least one printed circuit
board, each of said at
least two sets of LED light sources having a correlated color temperature
different from the
correlated color temperature of every other of said at least two sets of LED
light sources; an electric
circuit for supplying electricity to selected one of the group consisting of a
selected one of said at
least two sets of LED light sources and a combination of said at least two
sets of LED light sources;
and a controllable correlated color temperature switch for selectively
connecting said electric
circuit to a selected one of said at least two sets of LED light sources and a
combination of said at
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least two LED light sources to actuate said selected one of said at least two
sets with LED light
sources and a combination of said at least two LED light sources, to effect
the selective
illumination of said at least one LED in said selected one of said at least
two sets of LED light
sources and said combination of said at least two LED light sources to emit
illumination of the
color correlated temperature of said selected one with said at least two sets
of LED light sources
and a combination of said at least two LED light sources, said operated switch
being operatively
attached to said housing assembly and comprising a digitally operable
actuating member to effect
the selection of one of the at least two sets of LED light sources and a
combination of said at least
two sets of LED light sources.
In an eighth aspect, this document discloses an LED light fixture comprising:
at least three
sets of LEDs, each of said at least three sets of LEDs being respectively
electrically coupled
together for emitting illumination of a particular correlated color
temperature different from the
correlated color temperature different from the correlated color temperature
of the remainder of
said at least three sets of LEDs in response to receiving electrical power; at
least one electricity
provider connectable respectively to at least one of said at least three sets
of LEDs; electrical
circuitry connectable to said at least one electricity provider for connecting
said at least one of said
electricity providers to at least one of said at least three sets of LEDs; and
at least one of a
controllable correlated color temperature electricity provider switching
assembly connected to said
at least one electricity provider for enabling said at least one electricity
provider to supply
electricity to at least one of said at least three sets of LEDs to effect the
illumination of at least one
of said at least three sets of LEDs, said at least one controllable correlated
color temperature
electricity provider switching assembly including a digitally operated switch
actuating member for
actuating said controllable correlated color temperature electricity provider
switching assembly.
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In a ninth aspect, this document discloses an LED light fixture comprising:
electrical
circuitry for receiving electricity from a source of electricity, said
electrical circuitry including:
an electrical transmitter for transmitting electricity from said source of
electricity; at least two
groups of LED light sources, each of said at least two groups of LED light
sources emitting
illumination in response to receiving electricity of certain electrical
characteristics, said
illumination of said respective at least two groups of LED light sources
having a correlated color
temperature different from the correlated color temperature of each of the
other of said at least two
groups of LED light sources; at least three subcircuits, each of said at least
three subcircuits
including a different one of said at least two groups of LED light sources and
at least one selected
combination of said at least two groups of LEDs; and actuable electrical
switching components for
connecting to said electrical transmitter a selected one of said at least
three subcircuits, said
electrical switching components being actuable for connecting a selected one
of said at least three
subcircuits to connect a selected one of the group consisting of one of said
at least two groups of
LED light sources and at least one selected combination of said at least two
groups of LED light
sources to said electrical transmitter; and a manually controllable correlated
color temperature
switching assembly manually actuable for actuating said electrical switching
components to
connect said selected one of the groups consisting of said at least three
subcircuits to connect a
selected one of said at least two groups of LED light sources and a selected
combination of said at
least two groups of LED light sources to said electrical transmitter to
receive transmitted electricity
of said certain electrical characteristics to effect the LED light source
emission of illumination of
the correlated color temperature of said finally selected one of said at least
two groups of LED
light sources and the selected combination of said at least two LED light
sources.
In a tenth aspect, this document discloses an LED light fixture comprising: a
housing
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assembly; at least one printed circuit board operatively attached to said
housing assembly; at least
two sets of LED light sources mounted on said at least one printed circuit
board, each of said sets
of at least two LED light sources having a correlated color temperature
different from the
correlated color temperature of every other of said sets of LED light sources;
LED light source
selecting subcircuits actuable for selecting one of the group consisting of a
predetermined one of
said at least two sets of LED light sources and a combination of said group
consisting of at least
two sets of LEI) light sources from said at least two sets of LED light
sources; an electric circuit
operable to supply electricity to a selected one of said at least two sets of
LED light sources and
said combination of said group consisting of at least two sets of LED light
sources from said at
least two sets of LED light sources; a manually controllable correlated color
temperature switch
for selectively connecting and actuating said electric circuit to a selected
one of said at least two
sets of LED light sources and said combination of said group consisting of at
least two sets of LED
light sources, to effect the selective illumination of said group consisting
of at least one LED light
sources in said selected one of said sets of LED light sources and said group
consisting of at least
.. two sets of LED light sources, to emit illumination of the color correlated
temperature of said
selected one with said one set of LED light sources and said group consisting
of LED light sources,
said manually operated switch comprising a digitally operable actuating member
to effect the
selection of one of the sets of LED light sources and said combination of said
group consisting of
at least two sets of LED light sources.
In an eleventh aspect, this document discloses an LED light fixture
comprising:
a main electric circuit comprising at least three electric subcircuits; a set
of LED light sources for
emitting illumination, said set of LED light sources being comprised of at
least three actuable
portions of said set of LED light sources, a selected one of said at least
three actuable portions of
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said set of LED light sources being respectively connectable in at least one
of said three electric
subcircuits, at least one of said at least three respective electric
subcircuits being a combination of
at least two of said at least three actuatable portions of said set of LED
light sources, each of said
at least three actuatable portions of said set of said LED light sources when
connected in said at
least one of said three electric subcircuits generating illumination having a
different correlated
color temperature from each of other said at least three portions of said set
of LED light sources;
and a switching circuit operable for connecting a selected one of said at
least three actuatable
portions of said set of LED light sources in one of said at least three
respective electric subcircuits
to generate illumination of one correlated color temperature in response to
electric power being
sent to said selected one of said at least three respective electric
subcircuits; and a correlated color
temperature switching assembly being actuable to connect said selected one of
said at least three
actuatable portions of said LED light sources to a power source to actuate
said selected one of said
at least three actuatable portions of said set of LEL) light sources.
It is a general object of the present invention to provide an LED light
fixture including a
.. manually controllable, easily accessible CCT select switch that is an
easily operated,
inexpensive, efficient and effective.
Other objects are apparent from the description to follow and from the
appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of a recessed LED downlight with selectable color
temperature
with a manually controllable CCT select switch according to a preferred
embodiment of the
invention for insertion into a recessed can.
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Fig. 2 is a perspective view of another preferred embodiment of the invention
which is
another form of the recessed LED downlight having selectable color temperature
and provided
with a manually controllable color temperature for insertion in a recessed
can.
Fig. 3 is an exploded view of a recessed LED downlight as shown in Fig. 1.
Fig. 4 is a side view of the recessed LED downlight shown in Figs. 1 and 3,
and Fig. 5 is a
front view thereof.
Fig. 6 is an exploded view of the recessed LED downlight shown in Fig. 2.
Fig. 7 is a side view of the recessed LED downlight shown in Figs. 2 and 6.
Fig. 8 is an enlarged front view of a manually operated switch for selecting a
CCT for an
LED light fixture with an indicator showing three possible settings for the
switch.
Fig. 9 is a side view of a CCT downlight switch for the recessed LED downlight
shown in
Fig. 1, and Figs. 10-12 are perspective, rear and a cross-sectional view taken
in the direction 12-
12 in Fig. 11.
Fig. 13 is a circuit diagram of a circuit that could be incorporated in the
recessed LED
.. downlights shown in Figs. 1 and 2.
Figs. 14A-14B are respectively a schematic diagram and a symbolic symbol of a
single
pole single throw toggle switch that could be used in the manually
controllable LED/CCT light
fixture according to the present invention.
Figs. 15A and 15B are respectively a schematic drawing and a symbolic symbol
of a single
pole double throw toggle switch as another type of switch that could be used
in a light fixture
according to an embodiment of the present invention.
Figs. 16A-16B are respectively a schematic drawing and a symbolic symbol of a
double
pole double throw toggle switch as still another switch for use in a light
fixture incorporating the
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present inventive concepts of another embodiment of the invention.
Fig. 17 is a symbolic symbol for one pole of a three pole way rotary switch as
yet another
switch for use in an embodiment of the present invention.
Figs. 18A and 18B are two symbolic symbols of push button switches which also
can be
used as CCT manual switch in an embodiment of the present invention.
Figs. 19A and 19B are respectively electronic symbols of push-to-make and push-
to-break
switch for employment in other embodiments of the invention.
Fig. 20 is a side view of a ceiling fan LED light kit incorporating a manually
variable CCT
according to an embodiment of the invention.
Fig. 21 is a fan connect assembly incorporated in the fan LED light kit shown
in Fig. 20.
Fig. 22 is an exploded view of the ceiling fan LED light kit shown in Fig. 20.
Fig. 23 is a circuit diagram for the ceiling fan LED light kit that could be
used in the LED
light kit shown in Fig. 20 and 22.
Fig. 24 is an enlarged front view of slide switch assembly with an indicator
showing three
possible settings of the slide switch for use in the present embodiments, and
particularly on those
shown in Figs. 20 and 22.
Fig. 25 is a perspective view of an LED color changing ceiling light
incorporating the
present invention, and Fig. 26-28 are a second perspective view, a side view
and a front plan
view of the ceiling light shown in Fig. 25.
Figs. 29-31 are perspective, side and plan views of the interior portion of
the ceiling light
shown in Figs. 25-28 when the ceiling light is in a position to be attached to
a ceiling.
Figs. 32-34 are perspective, side and front plan views of another version of
the LED color
changing ceiling light fixture according to the present invention.
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Figs. 35-37 are perspective, side and front plan views of the interior of the
ceiling light
fixture shown in Figs. 32-34.
Fig. 38A-38C are circuit diagrams of alternate circuitry for each of the
ceiling light fixtures
shown in Figs. 25-37 and 39-50. Fig. 38 D is a circuit diagram for a related
circuit that could be
.. used in such ceiling light fixtures.
Figs. 39-40 are a perspective and a side view of a flush mount light fixture
according to
another embodiment of the invention.
Fig. 41 is an exploded view of the embodiment of the invention shown in Figs.
39 and 40.
Figs. 42-46 are, respectively, a top perspective view, a bottom perspective
view, a bottom
plan view, a cross sectional side view taken along the lines 45-45 in Fig. 44
and a side view, of
the bottom cover incorporated in the light fixture shown in Figs. 39-41.
Fig. 47 is a plan view of the printed circuit board used in the embodiment of
Figs. 39-46.
Figs. 48-50 are, respectively, a perspective view, a bottom view and a cross-
sectional view
taken along the lines 50-50 in Fig. 49, of a loop incorporated in the flush
mount light fixture
.. shown in Figs. 39-41.
Fig. 51 is a front view of a compartment for a CCT select switch showing a
door for
providing access to the switch.
Fig. 52 is a front view of the compartment shown in Fig. 51 with the door in
an open
position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As explained earlier, changing CCT is very desirable, and with the growing
popularity of
LED lamps and light fixtures incorporating such lamps, it is most desirable to
provide easily
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variable CCTs for LED lights and light fixtures. The present invention
provides manually
controllable or operable LED CCTs for many commonly available LED light
fixtures, including
downlights installable in a downlight receptacle referred to as a frame or
"can," conventional
LED lamps, appliances such as LED fan light kits, ceiling mountable LED light
fixtures such as
flush mount light fixtures and the like. The invention involves a manually
operable switch
incorporated in an electric circuit for powering an LED light that has a
controllable CCT, the
circuit including electronic components which are manually selectively
actuable for activating
one of a series of components of different light temperature. The term
"manually controllable"
includes controlled by a person's fingers, i.e. digitally. By means of mere
manual movements of
a switch, especially digital movements, an accessible switching element can be
adjusted to select
a specific CCT. Although any number of correlated color temperatures could be
employed, three
light temperatures has often been found to be appropriate ¨ particularly for
household, industrial
and institutional uses.
Referring first to Figs. 1 and 3, these figures show respectively an assembled
and an
exploded view of a 5 inch/6 inch recessed LED downlight 100 with manually
variable CCTs.
Referring specifically to Fig. 3, downlight 100 incorporates a light module 1,
and light module 1
includes a housing assembly comprising a box or electronics container 3 for
holding electrical
components which in turn holds a driver 5; light module 1 further comprises a
housing 7 which
includes a truncated heat sink 9 and a shade 11, and a manually controllable
CCT switching
device in the form of an easily accessible manually operable CCT switching
assembly 13. Driver
box 3 is attached to heat sink 9. Shade 11 is located on the inside of heat
sink 9. A printed circuit
board 15 is located proximal a closed end 17 of heat sink 9. A reflector 19 is
in effect a liner for
shade 11, and is attached to closed end 17 of heat sink 9 with screws 21
extending through tabs
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23 having holes therein, passing through peripheral notches 25 in printed
circuit board 15. A
diffuser 27 is attached to housing 7 by means of radially extending tabs 29
extending into a
recess between shade 11 and housing 7. A mounting assembly 31 is composed of a
pair of V-clip
supporting brackets 33, to which are attached V-clips or torsion springs 35,
and the foregoing
component parts of mounting assembly 31 are connected together by a set of
screws 37
extending through slots in each of V-clip supporting brackets 33 into screw
holes in mounting
assembly supporting brackets 39.
A more detailed discussion of the components of light module I will now be
described.
Referring to Figs. 3, 4 and 5, the respective exploded, side and front views
of the 5 inch/6 inch
recessed LED downlight I are shown. Heat sink 9 is provided for absorbing heat
generated by
the LED light sources incorporated in recessed LED downlight 1 on printed
circuit board 15, and
shade 11 is a liner for heat sink 11. Bracket 33 is provided for holding V-
clips 35 in place.
Diffuser 27 transmits light emitted by the LEDs mounted on printed circuit
board 15 of module
1. Reflector 19 located inside of heat sink 9 and lies against the inner
surface of housing 7 on
shade 11. A gasket 43 sits on a plastic rim 45 of housing 7. Housing 7
includes a truncated
plastic portion 47 out from which extend a series of parallel annular rings 49
(Fig. 5) having a
common longitudinal axis. Housing 7 overall has the shape of a truncated cone.
Manually operable CCT switch assembly 13 includes a slide switch 51 shown in
Figs. 8-
12. Slide switch 51 comprises a digitally operated switch actuating member
such as a slide 52
constructed as a hollow stem that is digitally slideable to result in the
actuating of a switch
member SI shown in the circuit diagram of Fig. 13 to change the CCT depending
to which
contact 1, 3 or 4 of CCT switch assembly 13 operatively is connected. Slide
switch 51 of CCT
switch assembly 13 further comprises a curved plate 53 which is slideable
along a curved wall 55
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of CCT switch assembly 13 (Fig. 3). Curved wall 55 has the same curvature as
does curved plate
53. Driver box 3 has an opening 57 (also shown also in Fig. 3) through which
slide 52 extends so
that a user with the user's fingers can move slide 52 along opening 57 to
select a specific
correlated color temperature. Slide switch 51 is shown in detailed view of
Fig. 8. Opening 57 in
driver box 3 can advantageously have three settings for color temperatures
3000K, 4000K and
5000K shown on a setting scale 60.
Manually controllable CCT switching assembly 13 is a preferably manually
controllable by
means of slide switch 51, but other types of CCT switching devices fall within
the scope of the
invention. For example, toggle switches are possible. Referring to Figs. 14A
and 14B, a single
pole single throw toggle switch (SPTS) 61 is shown schematically. SPTS switch
61 has a
manually movable actuator 63 movable between ON and OFF positions indicated by
arrow 65.
SPTS switch 61 could be modified for any number of correlated color
temperatures to be
selected. Contact is made by switching actuator 63 with an ON connect 67 to
connect an electric
power source to the lighting circuit, and for switching to an OFF contact 69,
to disconnect the
power source from the lighting circuit. SPTS 61 could be connected to replace
slide switch 51.
Another switch for replacing slide switch 51 is a single pole double throw
(SPDT) switch 71 as
depicted in Figs. 15A and 15B. SPDT switch 71 includes a manually movable
actuator 73
movable between an up position to connect a terminal 79 which is connected to
one power
source to a common terminal 77 and disconnected from terminal 75, and a down
position which
connects another power sources at terminal 75 to common terminal 77 and
disconnects the power
source from electrical connector 79 from common terminal 77. SPDT switch 71
could also be
modified for different CCTs to be selected. Another toggle switch that could
be used in place of
slide switch 51 is a double pole double throw (DPDT) switch 81 which operates
like two
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separate SPDT switches connected to the same circuit, and shown in Fig. 16A
and with a
schematic symbol shown in Fig. 16B. DPDT switch 81 has a manually movable
actuator 83
having a pair of connected switch arms 85 and 87. DBDT switch 81 could be
altered for any
number of CCTs to be selected. When actuator 83 is in the UP position, switch
arm 85 is not
engaging terminal A, and arm 85 is disconnected from terminal A and connected
to terminal B to
connect terminal B and common terminal C; arm 87 is simultaneously not
engaging terminal D
but does connect common terminal E to terminal F. When actuator 83 is in the
DOWN position,
switch arm 85 connects common terminal C and terminal A and is disconnected
from terminal B;
and switch arm 87 simultaneously connects common terminal E to terminal D and
is
disconnected from terminal D.
Another appropriate switch for being used in place of slide switch 51 is a
rotary switch.
Fig. 17 shows a circuit for one pole of a three pole four way rotary switch
91. Rotary switch 91
has a spindle 89 which is movable between four poles A, B, C and D. These
poles would be
modified to correspond to terminals corresponding in number to terminals 1, 2
and 4 in Fig. 13.
Rotary switches come in a variety of pin arrangements. The most common are the
following: 1
pole 12 way, 2 pole 6 way, 3 pole 4 way and 4 pole 3 way. In a 3 pole 4 way
switch, for
example, a pole A is connected to ways 1, 2, 3 and 4; pole B to ways 5, 6, 7
and 8; and a pole is
connected to poles 9, 10, 11 and 12. Turning spindle 86 connects each pole to
one of its ways in
turn, with each pole/way set switching.
Another manually operable type of switch that can be used as an alternative to
slide switch
51 is a DIP switch which is known in the art. A DIP switch is a manually
operable switch
packaged with others in a group in a standard dual in-line package (DIP). DIP
switches are
designed for use on printed circuit boards with other electronic components.
DIP switches are of
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various types including the rotary type, the slide type (two common slide
switches in a DIP
package are recessed slide switch and a non-recessed or extended slide
switches) and a rocker
type. Rotary DIP switches have multiple electrical contacts, and a switch is
rotated to align it
with a number printed on the package. These could be large that could be
changed by thumb
wheels, or very small so that a screwdriver must be used. The slide and rocker
types having
arrays of single pole, single throw (SPST) contacts that can be either on or
off. This permits each
switch to select a one-bit binary value. The values of all switches in the
package to be interpreted
as one number. A double-pole double throw DIP switch are available as SPST
switches.
The DIP switch package also has socket pins to provide an electrical path from
the switch
contacts to the circuit board. It is common to convert the circuits to high
and low signals rather
than using the contacts directly. When used to convert the circuits to high
and low signals, the
circuit board needs interface circuitry for the DIP switch, which consist of a
series of pull-up or
pull-down resistors, a buffer, decade logic and other components. In most
cases, the device's
firmware reads the DIP switch when the device is powered on. DIP switches are
small,
inexpensive and use low current and low voltage.
A push switch is another alternative to slide switch 51. Two types of push
button switches
are shown in Figs. 18A and 18B by symbolic symbols 93 and 94. Figs. 19A and
19B show,
respectively, a push-to-make switch 95, shown as a symbolic symbol in Figs.
19A, and a push-
to-break switch 96 shown as a symbolic symbol in Fig. 19B. Such push button
switches are non-
latching switches to cause a temporary change in a circuit when activated,
with an automatic
return mechanism such as a spring used to return the switch to its stable
state. Push-to-make
switch 95 includes an actuator 97 for engaging electrical contacts 99.
Similarly, push-to-break
switch 96 includes an actuator 101 which is biased to close electrical
contacts 103 and must be
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pressed to open the circuit. Push switches can also be used to replace slide
switch 51 which
function as a push-to-make or a push-to-break switch, depending on the wiring.
Push-to-make
switches 95 and push-to-break switches 96 could be modified to actuate
different numbers of
CCTs.
Referring to Fig. 2, and Figs. 6 and 7, a 4 inch recessed LED downlight 200
with selectable
correlated color temperature is shown having an LED light module 60. Module 60
includes a
heat sink 62, a shade 64, three clips 66, a diffuser 68, a driver box 70
holding a driver 72, and a
rim 74. Diffuser 68 is attached to a reflector 76. A printed circuit board 78
is connected to heat
sink 62 by screws 80 extending through appropriate screw receiving holes.
Clips 66 are
preferably made of sheet metal and are attached to heat sink 62 by screws 82
extending through
screw receiving holes in heat sink 62. Clips 66 have bent-over flanges 84 for
engaging the wall
of a downlight receiving well in a ceiling or the like. An electrical
receptacle assembly 86
receives an electrical plug within a downlight receiving well to provide
electrical power to driver
72. A slide switch 32 corresponds both in structure and as being part of a
manually operable
CCT switch assembly corresponding to CCT switch assembly 13 described in
detail above with
respect to downlight 100, and reference is made thereto, as well as to other
switch variations in
different types of switches for varying the CCTs.
Each of recessed LED downlights 10 and 200 are installed in a receptacle R,
and the
cooperation of respective downlights 100 and 200 and receptacles R form a
concealment for
concealing slide switches 51 and 32, to render slide switches 51 and 32 non-
observable and
inaccessible for operation. Once downlights 100 or 200 are partially or
completely removed from
the receptacle, the respective slide switches are accessible for operation.
A ceiling fan LED light kit with a manually controllable CCT switch according
to the
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invention will now be described. Referring first to Figs. 20 and 22, a ceiling
fan assembly 300
includes a ceiling fan LED light kit 102 incorporating a manually controllable
CCT switch 103 is
shown. Ceiling fan LED light kit 102 includes a diffuser in the form of a
light transmitting cover
104 attached to a cover support in the form of a base plate assembly 106.
Between cover 104 and
base plate 106 are disposed a printed circuit board adapter structure which
advantageously
includes a first printed circuit board adapter 108, a second printed board
adapter structure 120
and three printed circuit board adapters 124. Ceiling fan LED kit 102
comprises an electrical
components container box in the form of a driver box 110 attached to base
plate assembly 106 by
screws 111 extending through tabs 112, a driver 114 shielded by an insulator
116 and held in
.. place in driver box 110 by a driver box cover 118. Also included in the LED
light kit are a
second printed circuit board adapter 120 noted above, a switch holder 122,
screws 128 holding
manually adjustable CCT switch 103 in place, and a pull chain 130 extending
from a pull chain
holder 132. Extending upwardly from base plate 106 are a screw base 134 and a
socket 136 into
which an LED light source with an Edison adapter can be installed. Fig. 21
shows a fan connect
assembly 138 on which can be attached to an appropriate cap. Manually
adjustable switch 103 is
a slide switch corresponding in structure and with its electrical circuitry to
that described above
with respect to manually operable CCT switch assembly 13, and reference is
made thereto for a
detailed description as used in ceiling fan assembly light fan kit 102.
Manually adjustable switch
103 is used to change the correlated color temperature of the light by an easy
manual operation.
The electronic circuitry for manually controllable fan light 120 is shown in
Fig. 23.
Cover 104 has a diffuser 144 configured as a spherical segment for diffusing
illumination
from the LED light source incorporated in assembly light fan kit 102. It
incorporates bayonet
threading 145 for enabling it to be twisted in place on corresponding
threading 148 on base plate
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assembly 106. Diffuser 144 is easily removable to provide manual access to CCT
switch for easy
manual operations. The fan would be operated separately from the LED light.
Ceiling fan LED light kit 102 could use a slide switch corresponding to that
shown and
described in Figs. 8-12. The body of the LED light kit is a concealment to the
CCT switch. Any
of the other switches described hereinabove could be used as well, adapted to
the purpose
required for the ceiling fan LED light kit.
A slide switch assembly 146 shown in Fig. 24 is an appropriate manually
controllable CCT
switch ceiling fan light kit 102. It includes a housing 147 which could be
made from an
appropriate plastic, for housing the electronic circuitry and a slide 148
which is used to manually
change the CCT. A slot 149 is used to contain and enable the sliding of slide
148 between
various CCTs for which CCT switch assembly is adjustable. Slide 148 is
slidable between three
CCTs, namely 3000K, 4000K and 5000K. Of course any number of CCTs are
possible, and in
any values of CCT. It has been found that 3000K, 4000K and 5000K are
particularly
advantageous, 3000K referring to yellow light, 4000K referring to bright white
light and 5000K
referring to daylight. An indicator 150 designates the proper stopping point
for slide 148. A pair
of stops 151 are provided at opposite ends of slot 149 to indicate to the user
the endpoints to
which slide 148 can be moved.
One version of an LED color changing ceiling light fixture is shown in Figs.
25-28, whose
interior portion is shown in Figs. 29-31. Considering the exterior portion
first, a color changing
ceiling light fixture 152 has a generally square cross-section when viewed at
an angle
perpendicular to its longitudinal central axis when fixture 152 is hung from a
ceiling. It only has
a "general" square cross-section with rounded corners. LED color changing
ceiling light fixture
152 incorporates a translucent diffuser 154 through which light is
transmitted, and an exterior
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frame 156 for holding the interior of fixture 152 as described below, a base
158 disposed on top
of fixture 152 when fixture 152 is proximal a ceiling when fixture 152 is
attached to the ceiling.
Sets of holding brackets 160 which are removable from frame 156 enable the
removal of diffuser
154 from frame 156 and base 158 to provide access to slide switch assembly 146
as discussed
below. Each bracket 160 includes a central rod 162 flanked by two rods 164.
Each bracket is
composed of three rods having rectangular cross sections with parallel end
portions; each rod
including a central portion which extend vertically along frame 156 when
fixture 152 is attached
to a ceiling. The portions of each bracket 160 are generally horizontal with
the lower portions
being engageable with diffuser 154 to hold diffuser 154 in place to prevent
the discharge of
diffuser 154 from frame 156. The upper horizontal portions of each bracket 160
act like a fingers
to retain the respective brackets in place when diffuser 154 is being held
against frame 156. Rods
162 and 164 of each bracket 160 are integral so that the entire respective
brackets 160 must be
removed in order to enable the discharge of diffuser 154 from fixture 152.
The interior of LED color changing ceiling light fixture 152 is shown in Figs.
29-31. The
interior portion is designated by numeral 170. Base 158 also has a generally
square cross-section
and is contoured to receive frame 156 along its border. A printed circuit
board 172 is attached to
base 158 by means of a set of screws 174. Mounted on printed circuit board 172
is a series of
LEDs 176. LEDs 176 are arranged according to respective CCTs, the number of
types of LEDs
is determined according to the number of CCTs to which LED color changing
ceiling light
fixture can be set. Although different LEDs 176 with respective CCTs are not
indicated in Figs.
29 and 31, they preferably would be distributed on printed circuit board 172
in a uniform manner
so that the illumination for any selected CCT would be constant and uniform
when fixture 152 is
illuminated for each of the color temperatures. Sets of keyholes 178 and 179
are provided in base
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158 for receiving mounting screws to attach plate 158 to an electric outlet
box.
A housing 180 located in interior portion 170 of base 158 holds the
electronics for
operating the LEDs which follow the circuitry shown in Figs. 38A-38C discussed
below. Also
mounted on base 158 is a manually adjustable switch, which is shown as
manually adjustable
slide switch assembly 146 shown in Fig. 24. Switch assembly 146 includes
indicator 148, which
is not shown in Figs. 29 and 31 due to space limitations. As explained above,
slide 147 can be
manually adjusted to select a desired CCT. Also not shown are the electrical
conductors
extending from the circuitry inside of housing 180 to printed circuit board
172, since these were
omitted for the sake of clarity of Figs 29 and 31.
In order to remove brackets 160 from obstructing removal of diffuser 154, a
pair of
releasable latches 182 was partly shown in Figs. 29-31. Latches 182 have latch
arms 183
mounted on posts 185 to enable the rotation of arms 183 to selectively retain
or release diffuser
154. Latches 182 enable the removal of diffuser 154 from fixture 152 to make
possible the
desired easy setting of slide switch assembly 146, and to enable the
replacement of diffuser 154
on fixture 152 once the proper setting of slide 147 has been achieved.
Diffuser 154 is a
concealment to render slide switch assembly 146 unobservable and inaccessible
when it is
connected to base 158, and renders slide switch assembly 146 observable and
accessible once it
is removed from base 158.
Slide switch assembly 146 is attached to base 158 by means of a pair of screws
184 which
extend through tabs extending from a housing 186 of switch assembly 145 as
shown in Figs. 29
and 31. Housing 180 also has a pair of tabs for which another set of screws
188 is used to attach
housing 180 to base 158. Although not shown, a set of electrical leads are
disposed on a side 190
opposite to the side of base 158 shown in Figs. 29 and 31. These leads would
be operatively
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connected to the appropriate circuitry in the ceiling to which fixture 152 is
to be electrically
connected.
Another version of an LED color changing ceiling light fixture is shown in
Figs. 32-37 and
identified by the numeral 192. Electrical structure and operation of fixture
192 is nearly identical
to that of LED color changing ceiling light fixture 152, and reference for a
full description of
fixture 192 is made to the description of fixture 152. Thus, LED color
changing ceiling light
fixture 192 includes a diffuser 194, which is basically round in a plan view
as shown in Fig. 34.
Diffuser 194 is mounted against a frame 196 and held in place by a set of
brackets 198 whose
structure and function is virtually the same as that of brackets 160 in Figs.
25-28, to which
reference is made for a more detailed description of brackets 198. Fixture 192
includes a base
200 as shown in Fig. 33, which is proximal a ceiling when fixture 192 is
mounted to the ceiling.
Base 200 extends above frame 196 when fixture 192 is mounted to the ceiling.
Base 200 has a
rim 202 which is shown in Fig. 33. Diffuser 194 is a concealment to the slide
switch assembly
when it is attached to base 200 as discussed with respect to ceiling light
fixture 152.
Figs. 35-37 show the interior of fixture 192. Mounted on base 200 is a printed
circuit board
203 which can be identical to circuit board 172 shown in Figs. 29 and 31.
Printed circuit board
203 is mounted against base 200 by means of a set of screws 204. There is the
same variation in
a set of different CCTs of sets of LEDs 207 as existed in the set of LEDs 176
shown in Figs. 29
and 31. Sets of LEDs 207 are attached to printed circuit in the same manner as
LEDs 176 were
attached to printed circuit board 172 in the embodiment shown in Figs. 26-31.
Circuit board 203
is essentially U-shaped, providing room for a housing 208 which is held in
place by screws 212
extending through tabs 210 extending from the corners of housing 208 and into
an appropriate
hole in base 200. Manually adjustable switch assembly 146 is also attached to
base 200 by means
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of screws 214 extending through tabs on the corners of switch assembly 146
through holes in
base 200. Rim 202 extends around base 200 as mentioned earlier, and is raised
upwardly from
base 200 when fixture 192 is mounted on a ceiling, and extends far enough to
cover printed
circuit board 206.
Extending through the base 200 of fixture 192 are sets of keyholes 213 and
215. These key
holes are provided to enable the connection of LED color changing ceiling
light fixture 192 to an
electric outlet box by means of mounting screws.
Circuit diagrams for the switching circuitry used for operating the manually
controllable
LED CCT light fixtures shown in Figs. 25-37 (color changing ceiling lights)
and described
herein, and those shown in Figs. 39-50 (color changing flush mount) and
described herein below,
are shown in Figs. 38A-38C. Referring first to Fig. 38A, a switch 219A
controls current running
through resisters R1-R6 and the two LEDs Cl and W1 as shown. When switch 219
is the I and
l' position, current flows through LED Cl. When switch 219A is in the 2 and 2'
position, part of
the current flows through R1 and Cl, and part of the current flows through R4
and WI. When
switch 219A is in the 3 and 3' position, part of the current flows through R2
to Cl, and part of
the current flows through R5 and WI. When switch 219A is in the 4 and 4'
position, part of the
current flows through R3 and Cl, and part of the current flows through R6 and
WI. Finally,
when switch 219A is in the 5 and 5' position, with current flows to LED Wl.
Variations are possible with the switching circuits shown in Figs. 38B and
38C. Referring
to Fig. 38B, when switch 219B is in 1-1' position, current flows to LED Cl.
When switch 219B
is in the 2-2' position, current flows through RI and LED Cl, and through R2
and LED WI.
Finally, when switch 219B is in the 3-3' position, current only flows to LED
WI. Lastly,
referring to Fig. 38C, when switch 219 is in the 1-1' position, current flows
to LED Cl. When
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switch 219C is in the 2-2' position, current flows through R1 an LED Cl. When
switch 219C is
in the 3-3' position, current flows through R2 and LED Cl, and through R5 and
LED WI. When
switch 219C is in the 4-4' position, current flows to LED Wl. Fig. 38D is
another version of a
related switching circuit.
Referring first to Figs. 39-41, an LED light fixture 220 is shown. Light
fixture 220 is a
flush mount light fixture. Light fixture 220 includes a diffuser 222 which is
preferably made of a
translucent plastic, and a bottom cover 224. Bottom cover 224 has a
peripheral, forwardly-
extending outer wall 226 that is frusto-conical in configuration, flaring
outwardly to an
outwardly-flared, frusto-conical rim 228 having a greater amount of chamfer
than does outer
wall 226. Housing base 224 has a forward housing base portion 230. Forward
refers to being
proximal a floor when LED light fixture 220 is mounted to a ceiling with
diffuser 222 facing
downwards, and rearward likewise means proximal the ceiling. LED light fixture
220 is defined
as being "integral" because all of the components are self-contained; all one
needs to do is
simply screw the integral LED light fixture 220 into an incandescent light
bulb socket.
Fig. 41 is an exploded view of LED light fixture 220 showing diffuser 222 and
housing
base 224 described above. A socket base 234 is provided in the rear portion of
lamp base 224,
and it includes a junction body 236 which is permanently connected to an
Edison lamp base or
incandescent light bulb socket assembly 238 by means of a junction body stem
240 which is
inserted into Edison lamp base 238. Lamp base 238 is preferably an E26 lamp
base and has
external threads 242 which can be screwed into an incandescent bulb socket.
Socket base 234 is
permanently affixed to the rear part of housing base 224.
Considering both exploded view of Fig. 41, and Figs. 42-46, a further
description of
housing base 224 is now set forth. Housing base 224 has a relatively large
cylindrical forwardly-
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extending central portion 244 protruding from a horizontal wall 246 as
depicted in Figs. 42 and
44, and central portion 244 has a vertical wall 248 that is opposite to and
parallel with a
forwardly-extending interior wall 250, the latter being the interior of the
peripheral outer wall
226. Forwardly-extending interior wall 250 extends from an outer edge portion
252. Outer edge
portion 252 is the edge of horizontal wall 246. Horizontal wall 246, vertical
wall 248 and interior
wall 250 form an annular housing base recess 254. Protruding from the central
part of central
portion 244 is a smaller cylindrical central portion 256 having frusto-conical
wall 258. The
forward part of central portion 244 is a flat annular face 260, and the
forward part of smaller
cylindrical central portion 256 has a flat, generally-cylindrical face 262.
A pair of holes 264 in the shape of church-keyholes are provided in face 260
for receiving
mounting screws to attach LED light fixture 220 to an electric outlet box. A
set of fastener holes
266 are provided in face 260. A wire-holding slot 268 extends in central
portion 244, and a
correspondingly aligned wire-holding slot 270 extends in smaller cylindrical
central portion 256.
A set of interior tabs 272 are on the inside of rim 228. A set of fastener
holes 274 are provided in
face 260.
LED light fixture 220 incorporates a printed circuit board or light engine 276
and AC
circuitry 278 for supplying alternating current for enabling the illumination
of LEDs 280. Printed
circuit board 276 is shown in both the exploded view of Fig. 41 and in Fig.
47.
Printed circuit board 276 has an inner imaginary ring 282 about a central
longitudinal axis
.. 284 and a concentric imaginary outer ring 286. Disposed on imaginary inner
ring 282 are a series
of LEDs 288, and another series of LEDs 290 are disposed in imaginary outer
ring 286. Series of
LEDs 288 and 290 are dispersed having different correlated color temperatures
when
illuminated, each color being part of a group which are illuminated according
to the setting of a
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manually controllable CCT switching assembly discussed below. LEDs 290 are so
arranged that
when any particular LEDs with its particular CCT is switched on to be
illuminated occurs. Each
array of LEDs of a particular CCT can be arranged so that the illumination of
the selected CCT
illumination is uniform. LEDs 290 have also been arranged to have illumination
characteristics
besides being uniform as well. Printed circuit board 276 has a pair of holes
292 which are
arranged to fit precisely over holes 264 in flat annular face 260 so that
holes 264 and 292 overly
each other to enable access to the respective holes by the mounting screws for
securing fixture
192 to an outlet box. A set of holes 338 are provided in printed circuit board
for receiving screws
336 to attach printed circuit board 276 to face 260 of central portion 244, as
explained below,
.. extends through printed circuit board 276.
LED light fixture 220 has a forward side 296 and a rearward side 298 when it
is attached to
a ceiling. Referring to Fig. 44 which is a rearward view of bottom cover 224,
annular housing
base recess 254 extends around central portion 244. A pair of slots 299 and
301 extends through
horizontal wall 246 and can be seen in Figs. 42, 43 and 44. Slot 301 renders a
manually operable
CCT switch assembly 302 actuable by a person standing beneath the ceiling on
which flush
mount light fixture 220 is mounted. The entire body of LED light fixture 220
is a concealment to
CCT switch assembly 302, and light fixture 220 must be removed from the socket
on the ceiling
to render CCT switch assembly 302 observable and accessible for operation. CCT
switch
assembly 302 is shown in exploded view in Fig. 41 and is composed of a switch
components
304. Switch assembly 302 is attached by means of screws 308 to horizontal wall
246 and has a
slide extending through slot 301 which is manually actuable while light
fixture 220 is not
attached to an Edison socket attached to a ceiling. Alternatively, switch
assembly 302 can be
rendered accessible by a person by rendering it available by the simple
removal of diffuser 222
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as was done with the embodiments shown in Figs. 25-37.
Manually operated CCT switch assembly 302 is fixedly attached to horizontal
wall 246.
The setting of CCT assembly 302 can be changed by changing the location of the
slide of CCT
switch assembly 302 by the manual movement of slide (not shown) that extends
through slot 301
.. which is accessible once diffuser 722 has been removed as explained below.
As indicated
previously, the different correlated card color temperatures can be selected
any range of values,
but all as also indicated previously an advantageous setting is one of 3000K,
4000K and 5000K.
These are all noted on a setting scale 301 shown in Fig. 44 which can be
virtually identical to
setting scales 60 and 140 discussed previously.
Referring back to the exploded view of Fig. 41 and further to Figs. 48-50,
another portion
of the structure of LED light fixture 220 is a loop 322. Loop 322 is a
cylindrical tube having a
cylindrical wall 324 having at one end a partial annulus 326 in the form of a
radial arc which is
preferably integral with cylindrical wall 324, perpendicular to wall 324 and
concentric with wall
324. Partial annulus 326 has three equiangular tabs 328. Each tab has a screw
hole 330, each
.. having a cylindrical axis which is parallel with the axis of loop 322.
Annulus 326 terminates at
opposing ends 331 to define a gap 332.
Loop 322 is attached to horizontal wall 246 of bottom cover 224 by means of a
set of
screws 333 which extend through screw holes 330 and into screw holes 334 in
horizontal wall
246 to render loop 322 concentric with peripheral outer wall 226. Loop 322 and
peripheral outer
wall 226 of bottom cover 224 define between them an annular recess which is
concentric with
each of peripheral wall 324 of loop 322 and peripheral outer wall 226. Gap 332
in loop 322
provides an access to horizontal wall 246 wherein switch 304 is secured to
horizontal wall 246.
By the foregoing arrangement, loop 322 is secured to housing base 224, and
switch assembly
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Attorney Ref: 1363P001CA02
302 is attached to horizontal wall 246.
Referring to Fig. 41, printed circuit board 290 is secured to housing base 224
by means of a
screw 336 which extends through a screw hole 294 in printed circuit board 276,
and into a screw
hole in central portion 244.
In order to protect printed circuit board 290, a protective cap 342 shown in
Fig. 41 is
secured to printed circuit board 290 and to central portion 244 of housing
base 224. Protective
cap 342 is preferably a rigid, clear plastic unitary structure having a
generally flat upper portion
344 with a uniformly curved periphery 346. Protective cap 342 is secured to
central portion 244
by means of screws 348 which extend through equiangularly spaced screw holes
350 extending
through portion 344, through screw holes 352 in printed circuit board 290, and
thereafter
screwed in tightly into screw holes 354 in central portion 244 of housing base
224.
Figs. 51 and 52 depict a compartment for a manually actuable CCT switch
according to the
invention, including the manually actuable portion. Illustrated are a portion
of an LED light
fixture 356 (which could be any LED light fixture according to the invention)
having a manually
operable CCT switch assembly 358 (which could be any such CCT switch assembly
falling
within the scope of the invention) and a releasable latching assembly 360
(also within the scope
of the invention). The manually actuable CCT switch assembly 358 will not be
discussed at this
time, since it was discussed previously and references made thereto.
Releasable latching assembly 360 further includes a closure 362 composed of a
door 364
which is mounted to a housing or base 366 by means of a hinge assembly 368.
Hinge assembly
368 can be a simple barrel hinge assembly having a pair of barrels 370 that
are affixed to door
364, and a hinge pin 372 affixed to housing 366 and about which door 364
pivots. A latch
assembly 374 includes a male latching member 376 extending from door 364 and
having
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Attorney Ref: 1363P001CA02
extending from it flanges 378. A female latching member 380 having biased
catches 381 extends
from a recess 382 and base 366, and recess 382 extends further back from the
surface of base
366 from a larger recess. Female latching member 382 is in the line of swing
of male latching
member 376 and flanges 378 are engaged by members 380 when door 364 is moved
to the
closed position as shown in Fig. 51. As door 364 moves to its closed position,
male latching
member 376 pushes female latching member 380 into recess 382, and the frame of
recess 382
urges catches 381 against male latching member 376 and behind flanges 378 to
releasably retain
male latching member 376 in recess 382 and hold door 364 in the closed
position. An
appropriate handle 384 can be grasped by the user's fingers to open door 364
and withdraw
.. female latching member 380 from recess 382. Catches 381 are biased to their
open positions, to
release flanges 378 to enable the user to open door 364 and enable the user's
fingers to change
the setting of CCT switch assembly 358.
The invention has been described in detail with particular emphasis on the
preferred
embodiments thereof, but variations and modifications may occur to those
skilled in the art from
the preceding discussion and from the following claims.
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