U.S. patent application number 13/340169 was filed with the patent office on 2013-07-04 for multi-cavities light emitting device.
This patent application is currently assigned to INTEMATIX TECHNOLOGY CENTER CORP.. The applicant listed for this patent is Tzu-Chi Cheng, Hsi-Yan CHOU. Invention is credited to Tzu-Chi Cheng, Hsi-Yan CHOU.
Application Number | 20130170174 13/340169 |
Document ID | / |
Family ID | 48694650 |
Filed Date | 2013-07-04 |
United States Patent
Application |
20130170174 |
Kind Code |
A1 |
CHOU; Hsi-Yan ; et
al. |
July 4, 2013 |
MULTI-CAVITIES LIGHT EMITTING DEVICE
Abstract
A Multi-Cavities light emitting device includes a base, a blue
light emitting unit, at least two red light emitting units, a light
conversion layer and a lens, and the base has a central slot and at
least two side slots symmetrically formed on external sides of the
central slot, and the blue light emitting unit is installed in the
central slot, and the two red light emitting units are installed in
the two side slots respectively, and the light conversion layer is
covered onto the blue light emitting unit, and the lens is
protruded from the base and sealed onto the central slot and at
least two side slots, so as to achieve the effects of improving the
light extraction efficiency of an LED chip and the yield rate of
the product and reducing the overall assembling time and cost.
Inventors: |
CHOU; Hsi-Yan; (Yangmei,
TW) ; Cheng; Tzu-Chi; (Yangmei, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHOU; Hsi-Yan
Cheng; Tzu-Chi |
Yangmei
Yangmei |
|
TW
TW |
|
|
Assignee: |
INTEMATIX TECHNOLOGY CENTER
CORP.
|
Family ID: |
48694650 |
Appl. No.: |
13/340169 |
Filed: |
December 29, 2011 |
Current U.S.
Class: |
362/84 ; 362/231;
362/249.01 |
Current CPC
Class: |
F21Y 2105/10 20160801;
H01L 2924/181 20130101; H01L 33/483 20130101; H01L 2224/48137
20130101; H01L 2924/0002 20130101; H01L 25/0753 20130101; H01L
2224/16225 20130101; F21Y 2115/10 20160801; F21V 5/04 20130101;
F21K 9/00 20130101; H01L 33/58 20130101; H01L 2224/48091 20130101;
H01L 33/50 20130101; H01L 2224/48227 20130101; F21Y 2113/13
20160801; F21Y 2105/12 20160801; H01L 33/62 20130101; H01L 27/153
20130101; H01L 2224/48091 20130101; H01L 2924/00014 20130101; H01L
2924/0002 20130101; H01L 2924/00 20130101; H01L 2924/181 20130101;
H01L 2924/00012 20130101 |
Class at
Publication: |
362/84 ;
362/249.01; 362/231 |
International
Class: |
F21V 9/16 20060101
F21V009/16; F21V 21/00 20060101 F21V021/00; F21V 9/00 20060101
F21V009/00; F21V 5/04 20060101 F21V005/04 |
Claims
1. A Multi-Cavities light emitting device, comprising: a base,
having a central slot and at least two side slots symmetrically
formed on external sides of the central slot; a blue light emitting
unit, installed in the central slot; at least two red light
emitting units, installed in the at least two side slots
respectively; a light conversion layer, covered onto the blue light
emitting unit; and a lens, protruded from the base and sealed onto
the central slot and the at least two side slots.
2. The Multi-Cavities light emitting device of claim 1, wherein the
base is a ceramic base, and the base includes a plurality of
conductive holes and an inner-layer circuit, and the blue light
emitting unit and the red light emitting units are electrically
coupled through the conductive holes and the inner-layer
circuit.
3. The Multi-Cavities light emitting device of claim 1, wherein the
base includes four side slots formed around external sides of the
central slot, and the central slot and the side slots are
substantially in a long elliptical shape, and a gap between the
central slot and each of the side slots is greater than 0.5 mm.
4. The Multi-Cavities light emitting device of claim 1, wherein the
central slot and the side slots are formed in an area greater than
50% of the area of the base.
5. The Multi-Cavities light emitting device of claim 1, wherein the
blue light emitting unit is a blue LED chip array, and each of the
red light emitting units is a red LED chip array, and lights
emitted from the blue light emitting unit and the red light
emitting units and collected have a color temperature range from
2700K to 4000K.
6. The Multi-Cavities light emitting device of claim 1, wherein the
light conversion layer contains a yellow or green phosphor and the
yellow phosphor is yttrium aluminum garnet (YAG).
7. A Multi-Cavities light emitting device, comprising: a base,
having a central slot and at least two side slots symmetrically
formed on external sides of the central slot; a red light emitting
unit, installed in the central slot; at least two blue light
emitting units, installed in the at least two side slots
respectively; at least two light conversion layers, covered onto
the corresponding blue light emitting units respectively; and a
lens, protruded from the base, and sealed onto the central slot and
the at least two side slots.
8. The Multi-Cavities light emitting device of claim 7, wherein the
base is a ceramic base, and the base includes a plurality of
conductive holes and an inner-layer circuit, and the blue light
emitting unit and the red light emitting units are electrically
coupled through the conductive holes and the inner-layer
circuit.
9. The Multi-Cavities light emitting device of claim 7, wherein the
base includes four side slots formed around external sides of the
central slot, and the central slot and the side slots are
substantially in a long elliptical shape, and a gap between the
central slot and each of the side slots is greater than 0.5 mm.
10. The Multi-Cavities light emitting device of claim 7, wherein
the central slot and the side slots are formed in an area greater
than 50% of the area of the base.
11. The Multi-Cavities light emitting device of claim 7, wherein
the red light emitting unit is a red LED chip array, and each of
the blue light emitting units is a blue LED chip array, and lights
emitted from the red light emitting unit and the blue light
emitting units and collected have a color temperature range from
2700K to 4000K.
12. The Multi-Cavities light emitting device of claim 7, wherein
the light conversion layers contain a yellow or green phosphor and
the yellow phosphor is yttrium aluminum garnet (YAG).
13. A Multi-Cavities light emitting device, comprising: a base,
having a central slot and at least two side slots symmetrically
formed on external sides of the central slot, and the central slot
and the side slots being formed in an area greater than 50% of the
area of the base; a first light emitting unit, installed in the
central slot; and at least two second light emitting units,
installed in the at least two side slots respectively.
14. The Multi-Cavities light emitting device of claim 13, further
comprising a light conversion layer, and the first light emitting
unit is a blue light emitting unit, and each of the second light
emitting units is a red light emitting unit, and the light
conversion layer is covered onto the first light emitting unit.
15. The Multi-Cavities light emitting device of claim 13, further
comprising at least two light conversion layers, and the first
light emitting unit is a red light emitting unit, and each of the
second light emitting units is a blue light emitting unit, and the
light conversion layers are covered onto the second light emitting
units.
16. The Multi-Cavities light emitting device of claim 13, wherein
the base is a ceramic base, and the base includes a plurality of
conductive holes and an inner-layer circuit, and the blue light
emitting unit and the red light emitting units are electrically
coupled through the conductive holes and the inner-layer
circuit.
17. The Multi-Cavities light emitting device of claim 13, wherein
the base includes four side slots formed around external sides of
the central slot, and the central slot and the side slots are
substantially in a long elliptical shape, and a gap between the
central slot and each of the side slots is greater than 0.5 mm.
18. The Multi-Cavities light emitting device of claim 14, wherein
the blue light emitting unit is a blue LED chip array, and the red
light emitting unit is a red LED chip array, and lights emitted
from the first light emitting unit and the second light emitting
units and collected have a color temperature range from 2700K to
4000K.
19. The Multi-Cavities light emitting device of claim 15, wherein
the blue light emitting unit is a blue LED chip array, and the red
light emitting unit is a red LED chip array, and lights emitted
from the first light emitting unit and the second light emitting
units and collected have a color temperature range from 2700K to
4000K.
20. The Multi-Cavities light emitting device of claim 14, wherein
the light conversion layer contains a yellow or green phosphor and
the yellow phosphor is yttrium aluminum garnet (YAG).
21. The Multi-Cavities light emitting device of claim 15, wherein
the light conversion layer contains a yellow or green phosphor and
the yellow phosphor is yttrium aluminum garnet (YAG).
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a light emitting device, in
particular to a Multi-Cavities light emitting device capable of
emitting a warm white light.
BACKGROUND OF THE INVENTION
[0002] With the features of low power consumption, good
power-saving effect, long service life, small volume and quick
response, light emitting diodes (LED) have gradually replaced
traditional tungsten bulbs, fluorescent lamps or mercury lamps, and
the LEDs are applied extensively in various types of lamps.
[0003] With reference to FIGS. 1 and 2 for a schematic planar view
and a partial cross-sectional view of a conventional LED module
respectively, the LED module 1a comprises a substrate 10a, a
plurality of LED chips (such as blue LED chips) 20a, a fluorescent
plastic (such as a yellow fluorescent plastic) 30a and a plurality
of lenses 40a, wherein the substrate 10a includes a plurality of
slots 11a arranged in a matrix, and the LED chips 20a are installed
into the slots 11a respectively, and the fluorescent plastic 30a is
filled into the slots 11a for covering the LED chips 20a and
emitting a desired light color, and finally the lenses 40a are
combined and formed onto the fluorescent plastic 30a and the LED
chips 20a to seal each LED chip 20a. With the lens 40a, the light
emitting efficiency of the LED chip 20a can be improved to provide
a white light source.
[0004] In the foregoing structure, the lenses 40a are combined with
the LED chips 20a one by one, so that the overall assembling time
and cost will be increased. In addition, a large number of slots
11a are densely disposed, so that a substrate with a larger area is
required, and the strength of the substrate 10a will be affected
adversely, and the substrate 10a may be cracked or broken easily to
result in a low yield rate.
[0005] In view of the drawbacks of the conventional LED module, the
inventor of the present invention based on years of experience in
the related industry to conduct extensive researches and
experiments, and finally developed a feasible design to overcome
the aforementioned drawbacks of the prior art.
SUMMARY OF THE INVENTION
[0006] Therefore, it is a primary objective of the present
invention to provide a Multi-Cavities light emitting device to
achieve the effects of improving the light extraction efficiency of
an LED chip and the yield rate of the product and reducing the
overall assembling time and cost.
[0007] To achieve the aforementioned objective, the present
invention provides a Multi-Cavities light emitting device,
comprising a base, a blue light emitting unit, at least two red
light emitting units, a light conversion layer and a lens, and the
base has a central slot and at least two side slots symmetrically
formed on external sides of the central slot, and the blue light
emitting unit is installed in the central slot, and the at least
two red light emitting units are installed in the corresponding
side slots respectively, and the light conversion layer is covered
onto the blue light emitting unit, and the lens is protruded from
the base and sealed onto the central slot and the at least two side
slots.
[0008] To achieve the aforementioned objective, the present
invention provides a Multi-Cavities light emitting device,
comprising a base, a red light emitting unit, at least two blue
light emitting units, a light conversion layer, and a lens, and the
base has a central slot and at least two side slots symmetrically
formed on external sides of the central slot, and the red light
emitting unit is installed in the central slot, and the at least
two blue light emitting units are installed in the two
corresponding side slots respectively, and the light conversion
layer is covered onto the blue light emitting unit, and the lens is
protruded from the base and sealed onto the central slot and the at
least two side slots.
[0009] To achieve the aforementioned objective, the present
invention provides a Multi-Cavities light emitting device,
comprising: a base, a first light emitting unit, and at least two
second light emitting units, and the base has a central slot and at
least two side slots symmetrically formed on external sides of the
central slot. The central slot and the side slots are formed in an
area greater than 50% of the area of the base, and the first light
emitting unit is installed in the central slot, and the two second
light emitting units are installed in the at least two side slots
respectively.
[0010] Another objective of the present invention is to provide a
Multi-Cavities light emitting device, wherein a ceramic material is
used for making the base, and a gap between the central slot and
each of the side slots is greater than 0.5 mm to maintain the
strength of the base, so as avoid the substrate from being cracked
or broken, and improve the yield rate of the product.
[0011] Compared with the prior art, the light emitting device of
the present invention comprises at least three slots formed on the
base, and the blue LED chip and the red LED chip are installed into
each corresponding slot, and the blue LED chip is covered by a
plastic layer containing a yellow or green phosphor, so as to emit
a warm white light. Since the red LED chip is not covered with a
fluorescent plastic layer, therefore the light extraction
efficiency of the red LED chip will not be affected, and the
overall light extraction efficiency of the light emitting device
can be improved. In addition, the lens is integrally sealed onto
the central slot and at least two side slots, and thus it is not
necessary to seal the slots one by one, and the manufacturing time
and labor of the light emitting device can be reduced to lower the
overall cost. The invention can minimize the light emitting area
effectively to facilitate a secondary optical design at a later
stage, so as to provide a more practical use of the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is a schematic planar view of a conventional LED
module;
[0013] FIG. 2 is a partial cross-sectional view of a conventional
LED module;
[0014] FIG. 3 is a schematic planar view of a Multi-Cavities light
emitting device of the present invention;
[0015] FIG. 4 is a cross-sectional view of a Multi-Cavities light
emitting device of the present invention;
[0016] FIG. 5 is a cross-sectional view of a Multi-Cavities light
emitting device in accordance with another embodiment of the
present invention; and
[0017] FIG. 6 is a cross-sectional view of another Multi-Cavities
light emitting device in accordance with a further embodiment of
the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] The technical characteristics and contents of the present
invention will become apparent with the following detailed
description and related drawings. The drawings are provided for the
purpose of illustrating the present invention only, but not
intended for limiting the scope of the invention.
[0019] With reference to FIGS. 3 and 4 for a schematic planar view
and a cross-sectional view of a Multi-Cavities light emitting
device of the present invention respectively, the Multi-Cavities
light emitting device 1 comprises a base 10, a first light emitting
unit 20, at least two second light emitting units 30, a light
conversion layer 40 and a lens 50.
[0020] The base 10 has a central slot 11 and at least two side
slots 12 symmetrically formed on external sides of the central slot
11. The base 10 can be a ceramic base having a plurality of
conductive holes 13 and an inner-layer circuit 14, but the
invention is not limited to such arrangement only.
[0021] In this preferred embodiment, the first light emitting unit
20 is a blue light emitting unit, and each of the second light
emitting units 30 is a red light emitting unit, and the central
slot 11 and the side slots 12 are substantially in a long
elliptical shape, and a gap between the central slot 11 and each of
the side slots 12 is greater than 0.5 mm. In addition, the central
slot 11 and the side slots 12 are formed in an area greater than
50% of the area of the base 10.
[0022] The first light emitting unit 20 is installed in the central
slot 11, and the two second light emitting units 30 are installed
into two corresponding side slots 12 respectively. The first light
emitting unit 20 (which is the blue light emitting unit) and the
second light emitting units 30 (which are the red light emitting
units) are electrically coupled through the conductive holes 13 and
the inner-layer circuit 14, and the substrate 10 includes a
plurality of electric connecting pads 15 installed at the bottom of
the substrate 10. In this preferred embodiment, the blue light
emitting unit installed in the central slot 11 is a blue LED chip
array, and the red light emitting units installed on both external
sides of the blue light emitting unit are red LED chip arrays.
[0023] The light conversion layer 40 is a plastic layer containing
a yellow or green phosphor, and the light conversion layer 40 is
covered onto the first light emitting unit 20 (which is the blue
light emitting unit). For example, yttrium aluminum garnet (YAG) is
one of the yellow phosphors. After lights of the first light
emitting unit 20 (which is the blue light emitting unit) and the
second light emitting units 30 (which are the red light emitting
units) covered with the light conversion layer 40 are collected, a
warm white light is produced, wherein the warm white light has a
color temperature range from 2700K to 4000K.
[0024] The lens 50 is protruded from the base for sealing the
central slot 11 and the at least two side slots 12, and the lens 50
is made of resin, silicone, or epoxy resin, and a diffusion agent
is added into the material of the lens to form the shape of a lens
naturally, so as to enhance the light extraction and mix the lights
emitted from the first light emitting unit 20 (which is the blue
light emitting unit) and the second light emitting units 30 (which
are the red light emitting units).
[0025] With reference to FIG. 5 for a cross-sectional view of a
Multi-Cavities light emitting device in accordance with another
embodiment of the present invention, the difference between FIG. 5
and FIG. 4 resides on that the blue light emitting unit 20 is
combined into the central slot 11 by the method of a flip chip.
[0026] It is noteworthy to point out that the blue light emitting
unit and the red light emitting unit can be interchangeable. In
other words, the first light emitting unit 20 can be a red light
emitting unit, and each of the second light emitting units 30 can
be a blue light emitting unit. The red light emitting unit is
installed in the central slot 11. On the other hand, the side slots
12 include the blue light emitting units installed therein
respectively, and the side slots 12 are filled with the light
conversion layers 40, and the light conversion layers 40 are
disposed at positions corresponding to the blue light emitting
units for covering the blue light emitting unit, and the lens 50 is
provided for sealing the central slot 11 and side slots 12, so as
to complete assembling the light emitting device 1.
[0027] With reference to FIG. 6 for a Multi-Cavities light emitting
device in accordance with another preferred embodiment of the
present invention, this preferred embodiment is substantially the
same as the first preferred embodiment, and the light emitting
device 1' of this preferred embodiment comprises a base 10', a
first light emitting unit 20' (which is a blue light emitting
unit), at least four second light emitting units 30' (which are red
light emitting units), a light conversion layer 40' and a lens 50'.
In this preferred embodiment, the base 10' has a central slot 11'
and four side slots 12', and the side slots 12' are formed around
external sides of the central slot 11', wherein each side slot 12'
includes a second light emitting unit 30' installed therein, and
each second light emitting unit 30' (which is the red light
emitting unit) includes a plurality of red LED chips connected in
series with each other, and the red light emitting unit can be
substituted by a red LED array.
[0028] It is noteworthy to point out that in the use of the light
emitting device 1, 1' of the present invention, the quantity and
position of the second light emitting units 30' and the first light
emitting units 20' are not limited, so that the desired brightness
and color temperature can be adjusted flexibly.
[0029] While the invention has been described by means of specific
embodiments, numerous modifications and variations could be made
thereto by those skilled in the art without departing from the
scope and spirit of the invention set forth in the claims.
* * * * *