WO2011125512A1

WO2011125512A1 - Led light source

Info

Publication number: WO2011125512A1
Application number: PCT/JP2011/057125
Authority: WO
Inventors: 浩志井伊
Original assignee: シャープ株式会社
Priority date: 2010-04-09
Filing date: 2011-03-24
Publication date: 2011-10-13

Abstract

Disclosed is an LED light source wherein an LED chip and a fluorescent body are used. The LED light source is configured such that the chromaticity of synthesized light to be emitted from the LED light source can be adjusted to a predetermined chromaticity, even if the chromaticity of light emitted from the LED chip and the chromaticity of excitation light emitted from the fluorescent body vary. The LED light source (10, 11) is provided with a light emitting section (2), which has the LED chip (21) and the fluorescent body (22), and which emits the synthesized light of the first light (R1) emitted from the LED chip, and the second light (R2) emitted from the fluorescent body by being excited by the first light. Furthermore, the LED light source is provided with reflecting members (a reflector (3) and a reflecting sheet (4)) which emit third light (R3) corresponding to the first light (R1) and the second light (R2) so as to adjust the chromaticity of the synthesized light to the desired chromaticity.

Description

LED light source

The present invention relates to an LED light source that emits light of a predetermined color using an LED chip and a phosphor.

In recent years, lighting devices using LEDs (light-emitting diodes), which have long life and low power consumption and are environmentally friendly, have been put into practical use along with improvement in light emission efficiency and increase in light emission amount. Since the blue LED chip was developed, a white LED light source that emits white light has been developed by combining this blue LED chip and a phosphor that emits excitation light of a predetermined wavelength when excited by light from the LED chip. Has been.

The white LED light source using the LED chip and the phosphor is determined by the combination of the amount and type of the phosphor to be blended and the excitation light. Therefore, it is known that the chromaticity of the manufactured white LED light source itself varies due to variations in the composition of phosphors during manufacture, wavelength variations in LED chips, and the like.

In order to manufacture an LED lighting device having a predetermined emission color, an LED chip that emits light of a predetermined wavelength and an LED light source having a uniform chromaticity packaged by uniformly dispersing a predetermined phosphor are combined. It is essential. For this purpose, the produced LED light sources are classified for each chromaticity, and an illumination device that emits light with a desired emission color is manufactured using the same type of LED light sources classified.

Further, in a backlight device using an LED white lamp (corresponding to a white LED light source) as a light source, an excessive part of the spectrum of light emitted from the LED light source is provided on either the light guide plate or the reflection plate attached to the device. There has already been proposed a white LED light source backlight device capable of performing color correction by performing a reflection process for absorbing light (see, for example, Patent Document 1).

JP 2002-131032 A

LED light sources using LED chips and phosphors vary in the chromaticity of the LED light source itself produced due to variations in the emission wavelength of the LED chips and variations in the amount of phosphor to be blended. The lighting device is configured using the same type of divided and divided types. In addition, an illumination device is configured by combining the same number of LED light sources having different chromaticities. However, LED light sources that cannot be used even when combined are out of rank and cannot be used, resulting in a problem that the yield of LEDs deteriorates.

The backlight device described in Patent Document 1 corrects the chromaticity of the light from the white LED light source by absorbing a part of excess light by the light guide plate or the reflecting plate. In addition to the white LED light source, a member for adjusting the chromaticity is separately provided. Therefore, it becomes necessary to prepare and combine members such as a light guide plate having a reflection function that matches the white LED light source to be used, and the manufacturing process is not simple and complicated.

Therefore, in view of the above problems, the present invention provides an LED light source that uses an LED chip and a phosphor, and the LED light source emits light even if the chromaticity of the light emitted from the LED chip and the excitation light emitted from the phosphor varies. An object of the present invention is to provide an LED light source having a configuration capable of adjusting the chromaticity of the synthesized light to a predetermined chromaticity.

In order to achieve the above object, the present invention includes an LED chip and a phosphor, and a combined light of a first light emitted from the LED chip and a second light emitted from the phosphor when excited by the light. In the LED light source including the light emitting unit that emits light, the light source further emits third light for adjusting the chromaticity of the combined light to a desired chromaticity corresponding to the first light and the second light. A reflection member is provided.

According to this configuration, the reflection member that emits the third light that can obtain a desired emission color is provided even if the chromaticity of the light emitted from the LED chip and the excitation light emitted from the phosphor varies. Therefore, it is possible to emit combined light that emits light in a desired color, and an LED light source that can adjust the chromaticity of the combined light to a desired chromaticity can be obtained.

According to the present invention, in the LED light source configured as described above, the reflecting member includes a reflecting surface having a reflectance that is different from that of light having a different wavelength with respect to light having a predetermined wavelength, and is a reflector that reflects light in a predetermined direction. It is characterized by. According to this configuration, a predetermined color that causes variation in chromaticity because there are many specific color components according to variations in chromaticity between the first light emitted from the LED chip and the second light emitted from the phosphor. By using a reflector having a reflecting surface having a low reflectance with respect to the wavelength of the component, it is possible to reduce predetermined color components that cause variations in chromaticity, and to emit combined light having a predetermined chromaticity A light source can be obtained.

Moreover, this invention is an LED light source of the said structure, The said reflection member is provided with the reflective surface which has a different reflectance from the light of another wavelength with respect to the light of a predetermined wavelength, and is a reflecting sheet which reflects light in a predetermined direction. It is characterized by that. According to this configuration, a predetermined color that causes variation in chromaticity because there are many specific color components according to variations in chromaticity between the first light emitted from the LED chip and the second light emitted from the phosphor. By using a reflection sheet having a reflection surface having a low reflectance with respect to the component wavelength, it is possible to reduce predetermined color components that cause variations in chromaticity, and emit synthesized light having a predetermined chromaticity. An LED light source can be obtained.

Further, the present invention provides the LED light source having the above-described configuration, wherein the LED chip is a blue LED chip that emits blue light, and the phosphor receives the blue light and emits yellow excitation light, or A red phosphor and a green phosphor that receive blue light and emit red and green excitation light, wherein white light is emitted as synthesized light obtained by combining these excitation light and the blue light. It is said. According to this configuration, even if the chromaticity variation occurs in the product of the light emitting unit in which the LED chip and the phosphor are integrally packaged, the predetermined white light is emitted by using the predetermined reflecting member. Thus, all LED packages can be used without generating defective products, and the yield of LEDs can be improved.

Further, the present invention is characterized in that in the LED light source configured as described above, the reflective surface is formed of a reflective film having a reflectance different from that of light of other wavelengths with respect to light of a predetermined wavelength. According to this configuration, even if chromaticity variation occurs in the product of the light emitting unit in which the LED chip, the phosphor, and the reflective member are integrally packaged, by forming a predetermined reflective film on the reflective surface of the reflective member, It is possible to reduce a predetermined color component that causes a variation in chromaticity, and it is possible to emit third light that can generate uniform synthesized light.

The present invention is also characterized in that, in the LED light source having the above configuration, the reflective film is a metal thin film. According to this configuration, the color of the first light emitted from the LED chip and the second light emitted from the phosphor is obtained by using a reflective surface on which a metal thin film having a low reflectance with respect to light of a predetermined wavelength is used. A reflecting member capable of reflecting predetermined third light that generates desired combined light according to the variation in the degree can be obtained.

The present invention is also characterized in that, in the LED light source having the above-described configuration, the metal thin film is a gold plating film. According to this configuration, since a gold plating film having a low reflectance of light in the blue wavelength region is used as a reflection film, a white LED light source using a blue LED and a yellow phosphor, which tends to be strong in blue, has a desired color. A light source can be obtained.

According to the present invention, in addition to the first light emitted from the LED chip and the second light emitted from the phosphor, the chromaticity of these combined lights further corresponds to the first light and the second light. Since the LED light source is provided with a reflecting member that emits the third light for adjusting the chromaticity to the desired chromaticity, even if the chromaticity of the light emitted from the LED chip and the excitation light emitted from the phosphor varies. Thus, it is possible to emit synthetic light emitted in a desired color, and an LED light source capable of adjusting the chromaticity of the synthetic light to a desired chromaticity can be obtained.

It is a schematic explanatory drawing which shows the structure of the LED light source which concerns on this invention. It is a schematic explanatory drawing which shows the structure of the modification of the LED light source which concerns on this invention. It is a schematic explanatory drawing of the illuminating device which mounts the LED light source which concerns on this invention. It is a spectral waveform figure which shows an example of the emission spectrum of a white LED light source. It is a schematic explanatory drawing which shows an example of the spectral reflectance of each metal plating film. It is a schematic explanatory drawing which shows an example of the spectral reflectance of white resin. It is a figure which shows an example of the spectral waveform which synthesize | combined the reflectance of the gold plating film and silver plating film which are shown in FIG. 5 to the emission spectrum of the white LED light source shown in FIG. It is a chromaticity diagram which shows the change degree of the luminescent color of the LED light source correct | amended with a gold plating film and a silver plating film. It is a chromaticity diagram which shows the dispersion | variation in the luminescent color of an LED light source, and the adjusted state.

Embodiments of the present invention will be described below with reference to the drawings. Moreover, the same code | symbol is used about the same structural member, and detailed description is abbreviate | omitted suitably.

First, an example of the LED light source of this embodiment will be described with reference to FIG.

An LED light source 10 shown in FIG. 1 includes a substrate 1, a light emitting unit 2 in which an LED chip 21, a phosphor 22 and a sealing resin 23 are packaged and integrated, and light from the light emitting unit 2 in a predetermined direction. A reflector 3 serving as a reflecting member, and a first light R1 emitted from the LED chip 21, a second light R2 emitted from the phosphor 22 when excited by the light R1, and a third light emitted from the reflector 3. The synthesized light R4 obtained by synthesizing the light R3 is emitted.

Further, the reflecting surface of the reflector 3 is a reflecting surface that exhibits a specific reflectance with respect to light of a predetermined wavelength. For this purpose, the reflector 3 may be made of a material that exhibits a specific reflectance with respect to light of a predetermined wavelength, and a reflection that exhibits a specific reflectance with respect to light of a predetermined wavelength. The reflector 3 provided with the film | membrane 31 may be sufficient.

As described above, in this embodiment, since there are many specific color components depending on the chromaticity variation of the first light R1 emitted from the LED chip and the second light R2 emitted from the phosphor, the chromaticity variation. The reflector 3 having a reflecting surface having a low reflectivity with respect to the wavelength of a predetermined color component that causes the above-described factor is used. In this way, the third light R3 for adjusting the chromaticity of the composite light R4 is emitted in a predetermined direction for synthesizing the composite light R4, and a predetermined color component that causes variation in chromaticity Thus, the LED light source 10 that can emit the combined light of a predetermined chromaticity can be obtained.

For example, in the present embodiment, the reflector 3 including the reflective film 31 that exhibits a specific reflectance with respect to light of a predetermined wavelength is used. In such a configuration, the light R3 reflected by the reflective film 31 formed on the reflector 3 becomes light reflected at a specific reflectance with respect to light having a predetermined wavelength, and the combined light R4 emitted from the LED light source 10. Is an adjusted combined light whose hue is different from the light simply synthesized from the first light R1 emitted from the LED chip 21 and the second light R2 emitted from the phosphor 22.

In addition, the second light R2 emitted from the phosphor receives blue light and emits red and green light even with light having a monochromatic emission peak, such as a yellow phosphor that emits yellow excitation light upon receiving blue light. The light may have light emission peaks of two colors emitted from a red phosphor and a green phosphor emitting light. Moreover, it may be light having a plurality of emission peaks of two or more colors, and all light emitted from the phosphor upon receiving the first light R1 emitted from the LED chip is generically referred to as second light R2.

As described above, the combined light R4 emitted from the LED light source 10 corresponds to the first light R1 emitted from the LED chip 21 and the second light R2 emitted from the phosphor 22, and the combined light having a predetermined chromaticity. The light is chromatically adjusted so that it can be generated. With this configuration, the chromaticity of one or both of the light emitted from the LED chip 21 and the excitation light emitted from the phosphor 22 varies, and the LED chip 21 and the phosphor 22 are integrated. Even if the chromaticity of the luminescent color of the light emitting unit 2 is out of the desired chromaticity rank ranked, the desired chromaticity rank range can be obtained by adjusting using the reflective film 31 having a predetermined reflecting function. It becomes possible to emit the synthetic light R4 that emits light. Therefore, according to this embodiment, the LED light source 10 which can adjust the chromaticity of synthetic | combination light R4 to desired chromaticity can be obtained.

Therefore, if the color of light emitted from the light emitting unit 2 that originally combines the LED chip 21 and the phosphor 22 is a desired color, light in the wavelength range of all visible rays is reflected substantially evenly. A reflector 3 having a reflecting surface is used. For example, when a reflector made of a white resin or a reflector coated with a white resin is used as the reflector 3, a reflection surface that reflects on average almost all light in the visible light region is obtained.

In addition, if the color of light emitted from the light emitting unit 2 that combines the LED chip 21 and the phosphor 22 is chromaticity that is superior to blue, the reflective surface that absorbs blue wavelength light and has low blue reflectance. It is possible to emit combined light having a desired color using the reflector 3 having the above.

In addition, if the color of light emitted from the light emitting unit 2 in which the LED chip 21 and the phosphor 22 are combined is a chromaticity in which yellow has won, a reflecting surface that absorbs yellow wavelength light and has a low yellow reflectance. It is possible to emit combined light having a desired color using the reflector 3 having the above.

In this way, when the chromaticity of the light emitted from the light emitting unit 2 that combines the LED chip 21 and the phosphor 22 deviates from the desired chromaticity, the light of a better color is absorbed and the light By using a reflecting member (for example, the reflector 3) having a reflecting surface with a low reflectance, the LED light source 10 capable of emitting synthesized light having a desired color can be manufactured.

For example, a reflection film 31 made of a metal thin film such as gold or silver is formed on the resin reflector 3 so that a reflectance different from that of other wavelengths can be exhibited with respect to light of a predetermined wavelength. This metal thin film can be formed by vapor deposition or plating. As an example of the reflectance of the metal thin film, FIG. 5 shows an example of the spectral reflectance of various metal plating films.

As shown in the figure, the gold (Au) plating film has extremely low reflectance with respect to light having a wavelength of 350 nm to 500 nm, and shows a spectral reflectance that increases in a convex shape in the wavelength region of 500 nm to 750 nm. Yes. Further, the silver (Ag) plating film shows a higher reflectance than other metal plating films in the wavelength region of 350 nm to 750 nm. In particular, the reflectance for light with a wavelength of 350 nm to 500 nm is higher than that of other metal plating films.

The copper (Cu) metal plating film has a relatively low reflectance in the wavelength region of 350 nm to 550 nm, increases in a convex shape in the wavelength region of 550 nm to 750 nm, and generally has a higher reflectance than gold. However, in the wavelength region of 520 to 580 nm, the reflectance is lower than that of gold. Further, the aluminum (Al) metal plating film shows a reflectivity that gradually increases from 50% at 350 nm to 400 nm to 60% at 650 nm to 750 nm.

Thus, by selecting the type of metal, it is possible to form a reflective film having a reflectance different from that of light of other wavelengths with respect to light of a predetermined wavelength. In particular, in an LED light source that emits white light using a blue LED chip that emits blue light and a yellow phosphor that receives blue light and emits yellow excitation light, since blue tends to be strong, By using a reflector in which a reflective film having a low reflectance is formed in the blue wavelength region of 450 to 490 nm, the intensity of blue can be reduced. Therefore, in this case, it is preferable to use a reflector in which a gold thin film (for example, a plating film) having a low reflectance in a wavelength region of 500 nm or less is formed.

FIG. 6 shows the spectral reflectance of the white resin. As is clear from this figure, it can be seen that the white resin exhibits a high reflectance of 90% or more in the visible light region of 450 nm to 750 nm. Therefore, when a reflector made of white resin is used as the reflector 3, almost all light in the visible light region is reflected on average.

FIG. 4 shows an example of a spectral waveform of white light synthesized using a blue LED chip that emits blue light and a yellow phosphor that receives blue light and emits yellow excitation light. Further, the horizontal axis of this figure indicates the wavelength, and the vertical axis indicates the specific energy. As can be seen from this figure, the white light composed of the blue LED chip and the yellow phosphor has a high peak in the blue wavelength region of 420 nm to 470 nm and a gentle peak of a mixed color of green, yellow, and orange from 500 nm to 640 nm. Have

FIG. 7 shows spectral waveforms of the light reflected from the reflection surface of the gold (Au) plating film and the light reflected from the reflection surface of the silver (Ag) plating film.

The graph of + Ag shown in the figure is a spectral waveform of light reflected by the reflection surface of the silver (Ag) plating film, and the graph of + Au is the spectrum of light reflected by the reflection surface of the plating film of gold (Au). Waveform is shown.

As can be seen from this figure, the spectral waveform of the reflected light changes between the gold (Au) plating film and the silver (Ag) plating film, and there is a clear difference particularly in the wavelength region near 450 nm. It can be seen. That is, the intensity of the light changes in the blue wavelength region.

FIG. 8 is an xy chromaticity diagram of the XYZ color system, showing the degree of change in the emission color described above. A chromaticity diagram is a chromaticity coordinate in which hue and saturation are developed in a planar shape, and the distance between two points in the diagram is proportional to the degree of feeling a difference in color.

In this figure, the xy coordinates of the original white light (Original) are x: 0.2633, y: 0.2354, and a silver (Ag) plating film, x: 0.2652, y: 0.2389. It is shown that the gold (Au) plating film changes significantly to x: 0.2893 and y: 0.2713.

That is, it can be seen that when the light is reflected by the gold (Au) plating film, the degree of light emission is changed from the original white light or the light reflected by the silver (Ag) plating film.

Next, the chromaticity adjustment of the LED light source actually manufactured will be described with reference to FIG.

DA and DB in the figure are the actual LED light emitting members actually manufactured. As shown in the group A LED light-emitting members DA located at the lower left in the chromaticity diagram and the group B LED light-emitting members DB located at the upper right, they are manufactured as two groups with varying chromaticity.

In the present embodiment, the group A LED light-emitting members DA located at the lower left in the figure are adjusted to a predetermined chromaticity using a predetermined reflective film, and the group A LED light-emitting members DA are emitted from the group B LEDs. It can be used together with the member DB. For example, by using an LED light source equipped with a reflector having a metal plating film of copper (Cu), the chromaticity coordinates shown as DA + Cu in the figure can be adjusted. Further, by using an LED light source equipped with a reflector having a gold (Au) plating film, it is possible to adjust the chromaticity coordinates shown as DA + Au in the drawing.

As described above, even if the light emitting chromaticity varies for each LED light emitting member to be manufactured, the combined light having the predetermined chromaticity is emitted by using the reflector on which the reflecting film exhibiting the predetermined reflectance is formed. LED light source can be manufactured. Therefore, by using a predetermined reflecting member, LED light emitting members of different ranks can be used simultaneously for LED light sources of the same light emission chromaticity, and all LED light emitting members can be used without generating defective products. It becomes possible, and the yield of LED can be improved.

In this manner, a configuration is provided in which a reflective member that emits third light that can obtain a desired light emission color is provided even if the chromaticity of the light emitted from the LED chip and the excitation light emitted from the phosphor varies. Thus, it is possible to emit a synthesized light of a desired color, and an LED light source capable of adjusting the chromaticity of the synthesized light to a desired chromaticity can be obtained.

Next, a modified LED light source 11 shown in FIG. 2 will be described.

This LED light source 11 is an example using a reflection sheet 4 that includes a reflection surface having a reflectance different from that of light of other wavelengths with respect to light of a predetermined wavelength and reflects light in a predetermined direction as a reflection member. In this case, it is preferable to use the reflection sheet 4 made of a material that absorbs light of a predetermined color and has a low reflectance of the light. Moreover, it is good also as a structure which provides the reflective film 41 in which the light of a predetermined | prescribed hue is absorbed in the reflective surface of the reflective sheet 4, and the reflectance of the said light is low.

The configuration using the reflection sheet 4 includes the substrate 1, the light emitting unit 2 in which the LED chip 21, the phosphor 22, and the sealing resin 23 are packaged and integrated, as described above. The LED light source 10 is the same as the first light R1 emitted from the LED chip 21, the second light R2 emitted from the phosphor 22 when excited by the light R1, and the third light reflected by the reflecting surface. It is the same that the combined light R4 obtained by combining the light R3 is emitted. However, the difference is that the reflective sheet 4 is used instead of the reflector 3.

Even in this configuration, the third light R3 reflected by the reflection surface of the reflection sheet 4 is formed by forming the reflection film 41 that exhibits a specific reflectance with respect to light having a predetermined wavelength on the reflection surface. Corresponding to the first light R1 emitted from the LED chip 21 and the second light R2 emitted from the phosphor 22, the light is chromatically adjusted so as to generate the combined light R4 having a predetermined chromaticity. For this reason, even when the reflection sheet 4 is used, when the chromaticity of the light emitted from the LED chip 21 and the excitation light emitted from the phosphor 22 varies, the synthesized light emitted in a desired color is emitted in a predetermined direction. The LED light source 11 that can be adjusted so as to be emitted toward the target and can adjust the chromaticity of the combined light R4 to a desired chromaticity can be obtained.

Therefore, as in the case of the LED light source 10 described above, if the light emission from the light emitting unit 2 that originally combines the LED chip 21 and the phosphor 22 has a desired color, all visible light wavelengths are used. A reflective sheet 4 having a reflective surface that reflects light in a range substantially evenly may be used. In addition, if the color of light emitted from the light emitting unit 2 that combines the LED chip 21 and the phosphor 22 is chromaticity that is superior to blue, the reflective surface that absorbs blue wavelength light and has low blue reflectance. If the chromaticity is such that yellow is a superior chromaticity, it is possible to absorb yellow light and use the reflective sheet 4 having a reflective surface with a low reflectance of yellow to obtain a desired color tone. It becomes possible to emit synthetic light.

Next, an example of an illumination device equipped with the LED light source 10 according to the present embodiment will be described with reference to FIG.

The illumination device 50 shown in FIG. 3 is an edge light type surface emitting illumination device, and a plurality of LED light sources 10 are installed on the side portion of the light guide plate 5, and light enters the inside of the light guide plate 5 from this side end portion. Thus, the backlight emits light in a planar shape from the light emitting surface 51.

Therefore, in order to emit light with a uniform color over the entire light emitting surface 51, the light emission color of each of the plurality of LED light sources 10 installed, that is, the color of the combined light R4 emitted from each LED light source 10 is determined. It is preferable that they are aligned.

In the present embodiment, each LED light source 10 uses the reflector 3 on which each appropriate reflective film 31 necessary for synthesizing the predetermined combined light R4 is used, so that each LED light source 10 emits. The light (synthetic light R4) becomes light with a substantially uniform hue. Therefore, the illumination device 50 has a configuration capable of receiving light of a substantially uniform color from a plurality of LED light sources 10 installed on the side of the light guide plate 5.

Further, not only the reflective film 31 of the reflector 3 but also the reflective sheet 6 provided on the upper surface side and the lower surface side of the light guide plate 5 is formed with a reflective film 61 that exhibits a specific reflectance with respect to light of a predetermined wavelength. In addition, it is possible to finely adjust the hue of the composite light R4 by emitting the reflected light R3A having a different hue.

With the above configuration, the first light R1 emitted from the LED chip 21, the second light R2 emitted from the phosphor 22, and the third light R3 reflected by the reflector 3 are combined and adjusted to a desired chromaticity. In the illumination device 50 provided with a large number of LED light sources 10, the light emission chromaticity of a predetermined color can be finely adjusted via the reflection sheet 6 disposed in the periphery in order to collect the light from the LED light sources 10. It becomes.

Of course, in the illumination device 50 having the above-described configuration, the LED light source 11 including the reflective sheet 4 having the predetermined reflective film 41 can be used instead of the LED light source 10. In addition, using the LED light source 11 and the reflective sheet 6 having the reflective film 61, the color of the composite light R4 can be finely adjusted.

At this time, the reflection sheets 6 may all be made of the same material, or a reflection film having a predetermined reflection function may be formed in part. For example, in the illumination device 50 having a configuration in which a large number of LED light sources (10, 11) are arranged at a predetermined pitch, a gold (Au) metal thin film is provided in the periphery of each LED light source, and the rest is formed of a white member. The reflection intensity can be adjusted.

As described above, in the case of the LED light source according to the present invention, in addition to the first light emitted from the LED chip and the second light emitted from the phosphor, the chromaticity of these combined lights is further set to a desired chromaticity. Since the LED light source has a configuration in which a reflecting member that emits third light for adjustment is provided, even if variations occur in the chromaticity of the light emitted from the LED chip and the excitation light emitted from the phosphor, the desired color can be obtained. The combined light can be emitted, and an LED light source that emits light in a desired color can be obtained.

For example, using a blue LED chip that emits blue light, a yellow phosphor that emits yellow excitation light in response to the blue light, and a reflective member having a reflective film that has a low reflectivity for a desired wavelength, a desired color tone is obtained. It is possible to obtain a white LED light source that emits white light.

In addition, a pseudo-white light source that combines a blue LED chip that emits blue light, a phosphor that emits red excitation light upon receiving the blue light, and a phosphor that emits green excitation light, has a desired wavelength. A white LED light source that emits white light of a desired color can be obtained using a reflective member having a reflective film having a low reflectance.

Therefore, even if chromaticity variation occurs in the product of the light emitting unit in which the LED chip and the phosphor are packaged together, adjustment is made so that predetermined white composite light is emitted by using a predetermined reflecting member. This makes it possible to use all the LED packages without generating defective products, thereby improving the yield of LEDs.

As described above, according to the present invention, in the LED light source using the LED chip and the phosphor, even if the chromaticity of the light emitted from the LED chip and the excitation light emitted from the phosphor varies, the predetermined reflecting member is provided. It is possible to obtain an LED light source having a configuration in which the chromaticity of the combined light emitted from the LED light source can be adjusted to a predetermined chromaticity.

The LED light source according to the present invention is an LED light source that can emit predetermined synthesized light by adjusting the variation of the light emitting unit using the LED chip and the phosphor, and is therefore used for an LED illumination device including a plurality of light emitting units. It can be suitably used for an LED light source.

1 substrate 2 light emitting part 3 reflector (reflective member)
4 Reflective sheet (reflective member)
DESCRIPTION OF SYMBOLS 5 Light guide plate 6 Reflection sheet 10 LED light source 11 LED light source 21 LED chip 22 Phosphor 23 Sealing resin 31 Reflective film (metal thin film)
41 Reflective film 50 Illumination device R1 First light R2 Second light R3 Third light R4 Combined light

Claims

An LED chip and a phosphor, the first light emitted by the LED chip;
In an LED light source comprising a light emitting unit that emits combined light with second light emitted from the phosphor that is excited by the light,
The LED further comprises a reflecting member that emits third light for adjusting the chromaticity of the combined light to a desired chromaticity corresponding to the first light and the second light. light source.
2. The LED according to claim 1, wherein the reflection member is a reflector that includes a reflection surface that has a reflectance different from that of light of another wavelength with respect to light of a predetermined wavelength, and reflects the light in a predetermined direction. light source.
2. The reflection sheet according to claim 1, wherein the reflection member is a reflection sheet that includes a reflection surface having a reflectance different from that of light of other wavelengths with respect to light of a predetermined wavelength, and reflects light in a predetermined direction. LED light source.
The LED chip is a blue LED chip that emits blue light, and the phosphor emits yellow excitation light by receiving the blue light, or red and green excitation by receiving the blue light. 4. A red phosphor and a green phosphor emitting light, wherein white light is emitted as a synthesized light obtained by synthesizing these excitation light and the blue light. LED light source of description.
5. The LED light source according to claim 2, wherein the reflective surface is formed of a reflective film having a reflectance that is different from that of light having a predetermined wavelength with respect to light having a predetermined wavelength.
The LED light source according to claim 5, wherein the reflective film is a metal thin film.
The LED light source according to claim 6, wherein the metal thin film is a gold plating film.