JP2006332384A - Light source device and method of adjusting same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult for a conventional light source device to adjust chromaticity of output light. <P>SOLUTION: A light source device which outputs excitation light of light emitted by a light emission source has: a first phosphor containing member (14) where a phosphor is partially present; and a second phosphor containing member (12) where the phosphor is partially present. The first and second phosphor containing members (14 and 12) are placed one over the other in the light projection direction of the light source. For adjustment, the second phosphor containing member (12) is rotated or moved almost in parallel to adjust the angle or movement quantity of the second phosphor containing member (12) to the first phosphor containing member (14), and consequently the area ratio of the phosphor viewed from the light source is varied to adjust the chromaticity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an illumination light source device and an adjustment method for the light source device, and more particularly to an illumination light source device for a light receiving display device such as a liquid crystal display device and an adjustment method for the light source device.

Conventionally, for example, in a light source device using a light emitting diode (hereinafter abbreviated as LED), it has been important to set the chromaticity of emitted light to white light close to a natural color.
In addition, there is a method for realizing white color by mixing light emitted from red (hereinafter abbreviated as R), green (hereinafter abbreviated as G), and blue (hereinafter abbreviated as B) LEDs in order to emit white light. It was. On the other hand, in order to reduce the cost, the blue LED is sealed with a resin containing a yellow phosphor, and the blue light emitted from the blue LED and the yellow phosphor are excited and generated. A technique for producing white light by using mixed light with yellow excitation light has been put into practical use.

  FIG. 11A shows a cross-sectional view of such a conventional white LED. In a case 46 whose inner surface is a mirror surface, a BLED 48 that emits blue light is a resin 44 containing a yellow fluorescent member 42. Sealed and packaged. Of the blue light (hereinafter abbreviated as B light) emitted from the BLED 48, the light that has not collided with the yellow fluorescent member 42 in the resin 44 is emitted to the outside as blue light 50. Of the B light emitted from the BLED 48, the light that collides with the yellow fluorescent member 42 in the resin 44 excites the fluorescent member 42, and yellow excitation light (hereinafter abbreviated as Y light) 52 is emitted to the outside. As a result, the LED light source shown in FIG. 11A emits white light that is a mixed color light of B light and Y light.

Therefore, the chromaticity of the white light to be output can be adjusted by adjusting the amount of the fluorescent member 42 in the resin 44.
However, even when the resin 44 and the phosphor 44 are uniformly mixed when the phosphor 42 is mixed with the resin 44, the phosphor 44 generally has a specific gravity greater than that of the resin, so that the resin 44 is cured until the resin 44 is cured. The phosphor 42 has settled as shown in FIG. 11B, and when completed, there has been a problem that the chromaticity is distorted (see, for example, Patent Document 1, -0005, 0006-). ).

As another inexpensive white light generating means, there is a method in which an LED that emits ultraviolet rays is used, and a phosphor that emits red, green, and blue visible rays by excitation of the ultraviolet rays is provided (see, for example, Patent Document 2). . In such a white light generating means, it has been a very difficult problem to make the white light to be output close to natural light.
In the following drawings, the same members are denoted by the same numbers.

JP 2000-022220 JP 2001-156338 A

  The problem to be solved is that it is difficult to adjust the chromaticity of the output light in the conventional light source device.

  The light source device of the present invention is a light source device that outputs excitation light of light emitted from a light source, and includes a first phosphor-containing member in which a phosphor is partially present, and a first phosphor in which the phosphor is partially present. And the first and second phosphor-containing members are stacked in the light emitting direction of the light source.

  In the light source device of the present invention, the light source outputs a mixed color light of a light emission color of the light emitted from the light source and an excitation light color in which the light emitted from the light source is excited by the phosphor. And

  The light source device of the present invention is characterized in that the first phosphor-containing member and the second phosphor-containing member have the same shape and phosphors are distributed.

  The light source device of the present invention is characterized in that the second phosphor-containing member is rotated or moved substantially in parallel with the first phosphor-containing member.

  Further, the light source device of the present invention includes a phosphor that emits white light by using excitation light of light emitted from a light source, and that is a light source device that emits white light. A first phosphor-containing member in which the phosphor is partially present, and a second phosphor-containing member in which the phosphor is partially present, and the light emission direction of the light source The first and second phosphor-containing members are placed on top of each other.

  In the light source device of the present invention, the light source is a light emitting diode.

  In the light source device of the present invention, the light emitting diode is a blue light emitting diode, and the phosphor is a YAG body.

  In the light source device of the present invention, the light source is a light emitting diode that emits ultraviolet light, and the phosphor is a phosphor that emits red, green, and blue light, and is excited by the ultraviolet light to emit red light, It outputs a mixed color light of green light and blue light.

  The light source device adjustment method of the present invention is the light source device adjustment method for outputting the excitation light of the light emitted from the light source, wherein the phosphor is partially present, and the phosphor A second phosphor-containing member partially present, and the first and second phosphor-containing members are stacked in the light emitting direction of the light source, and the second phosphor-containing member is rotated. Or by changing the angle of the second phosphor-containing member with respect to the first phosphor-containing member or the amount of movement thereof by moving substantially in parallel, thereby changing the area ratio of the phosphor visible from the light source. The chromaticity is adjusted by the above.

  The light source device adjustment method of the present invention is a light source device adjustment method that outputs excitation light of light emitted from a light emission source, wherein the excitation light source that emits the excitation light is packaged with a member containing a phosphor, A first phosphor-containing member in which the phosphor is partially present, and a second phosphor-containing member in which the phosphor is partially present, and the first and first phosphors in the light emitting direction of the light source. The two phosphor-containing members are placed on top of each other, and the second phosphor-containing member is rotated or moved substantially in parallel, whereby the angle of the second phosphor-containing member with respect to the first phosphor-containing member Alternatively, the chromaticity is adjusted by changing the area ratio of the phosphor seen from the light source by adjusting the movement amount.

  According to the present invention, since the chromaticity of the output light of the light source device can be easily adjusted, the output light with a desired chromaticity can be obtained, and the quality of the light source device can be improved. In addition, since adjustment is possible even after the light source device is packaged, the non-defective product rate of the light source device can be significantly increased, which is effective in reducing the cost.

  The light source device of the present invention is a light source device that outputs excitation light of light emitted from a light source, and includes a first phosphor-containing member in which a phosphor is partially present, and a first phosphor in which the phosphor is partially present. Two phosphor-containing members, and the first and second phosphor-containing members are stacked in the light emitting direction of the light source. In the light source device of the present invention, the first and second phosphor-containing members are placed on a light emitting device in which an excitation light source and a phosphor are packaged. In the adjustment, the angle or the amount of movement of the second phosphor-containing member with respect to the first phosphor-containing member is adjusted by rotating or substantially parallelly moving the second phosphor-containing member. Thus, the chromaticity was adjusted by changing the area ratio of the phosphor visible from the light source.

FIG. 1 is a diagram for explaining a first embodiment of a light source device according to the present invention.
In FIG. 1, a first phosphor-containing member 14 and a second phosphor-containing member 12 are stacked in the light emission direction of the LED light source 10.

Here, the phosphor-containing member will be described with reference to FIG.
FIG. 3A is a plan view of the phosphor-containing member 12, and FIG. 3B is an example of a side view of the phosphor-containing member 12 as viewed from below in FIG.
In the phosphor-containing member 12 shown in FIG. 3A, the hatched portion 18 is a portion containing the phosphor, and the plain portion 16 is a colorless and transparent portion not containing the phosphor. . The portion containing the phosphor is provided in a wing shape every 30 ° in a pattern like a windmill, and the portion containing the phosphor is set to occupy 50% of the entire area. .
As shown in FIG. 3B, the side surface of the phosphor-containing member 12 viewed from below in FIG. 3A is provided with a dent part in a colorless and transparent sheet-like member 16, and the dent part. A resin 18 containing a phosphor is applied or embedded. That is, the fluorescent material is partially present in the containing member used in the present invention, and the existing portion is the hatched portion shown in the plan view of FIG.
Further, since the phosphor-containing member is placed on the light source 10 in the light emitting direction of the LED light source 10, there is no influence even if the phosphor settles in the process of hardening the resin.

As shown in FIG. 1, in the light source device of the present invention, the first phosphor-containing member 14 and the second phosphor-containing member 12 are placed in the light emitting direction of the LED light source 10, but the color of the light source device The operation status of the first and second phosphor-containing members 14 and 12 when adjusting the degree will be described with reference to FIG.
4A and 4B, the phosphor-containing members 14 and 12 shown in FIG. 3A are overlapped, and the phosphor-containing member 112 is rotated to rotate the second phosphor-containing member 12 with respect to the first phosphor-containing member 14. The example which changed the angle is shown. That is, an example is shown in which phosphors are distributed in the same shape on the first phosphor-containing member 14 and the second phosphor-containing member 12.
4A shows an example in which the angle of the second phosphor-containing member is not changed with respect to the first phosphor-containing member 14, FIG. 4B shows an example in which the angle is rotated by 10 °, and FIG. (D) is an example rotated 30 °.

  In FIG. 4A, the light emitted from the LED light source 10 is transmitted as it is in the region 26 where the phosphor is not distributed, and the light emitted from the LED light source 10 excites the phosphor in the region 24 where the phosphor is distributed. Then, excitation light from the phosphor is emitted. The light transmitted through the phosphor-containing member in this way becomes a mixed color light of the light emitted from the LED light source 10 and the excitation light from the phosphor. For example, when a blue LED is used as the LED light source 10 and a YAG body that is a yellow phosphor is used as the phosphor, blue light is transmitted from the region 26 where the phosphor is not distributed, and the region where the phosphor is distributed. 24 emits yellow light, and the light source device emits white light which is a mixed color of blue and yellow.

In FIG. 4 (b), since it is rotated by 10 °, the portion 24 where the phosphor is distributed in both the first phosphor-containing member 14 and the second phosphor-containing member 12 is fluorescent only in one. The regions 28 and 30 where the body is distributed and the region 26 where the phosphor is not distributed are generated. Depending on the amount of the phosphor in the phosphor distribution region, when a sufficient amount of the phosphor is distributed, the phosphor is distributed to both the first phosphor-containing member 14 and the second phosphor-containing member 12. The transmitted light is considered to be substantially the same between the portion 24 where the light is distributed and the portions 28 and 30 where the phosphor is distributed only on one side. Therefore, the transmitted light when adjusted as shown in FIG. 4B is stronger than that when adjusted as shown in FIG. 4A.
In FIG. 4 (c), the region 26 where the phosphor is not distributed in both the first phosphor-containing member 14 and the second phosphor-containing member 12 is further reduced because it is rotated by 20 °. In 4 (d), the region 26 where the phosphor is not distributed on both sides is almost disappeared because it is rotated by 30 °.
In this way, if the angle is adjusted by rotating and stacking at least two phosphor-containing members as shown in FIG. 3, the chromaticity is linearly changed between 0 ° and 30 °. Is very easy.
In addition, such a pattern has an advantage that adjustment is possible even if the center points of the first and second phosphor-containing members are slightly shifted.

The adjustment range can be freely set by adjusting how to select the pattern of the phosphor-containing member, the amount of phosphor distribution, and the like.
1, 3 and 4 use the same pattern for the first phosphor-containing member 14 and the second phosphor-containing member 12, so that only one type of phosphor-containing member is produced. The effect of the invention can be obtained, which is advantageous in terms of cost.

Returning to FIG. 1, the first phosphor-containing member 14 and the second phosphor-containing member 12 described in FIGS. 3 and 4 are overlapped in the light emitting direction of the LED 10 in FIG. By rotating the second phosphor-containing member 12 and adjusting the angle of the second phosphor-containing member 12 with respect to the first phosphor-containing member 14, the color ratio can be changed by changing the area ratio of the phosphor visible from the light source. The degree is adjusted.
Although two phosphor-containing members are used here, it is of course possible to use three or more in order to perform finer adjustment. The present invention produces an effect by using two or more phosphor-containing members. .

Here, when realizing a white light source using a blue LED, the light source 10 is a blue LED, and the phosphor contained in the phosphor-containing members 12 and 14 is a YAG phosphor.
When a white light source using an ultraviolet LED is realized, the light source 10 is an ultraviolet LED, and the phosphor contained in the phosphor-containing members 12 and 14 is a white phosphor. As the white phosphor, for example, a blue and green luminescent substance, a mixture of barium (Ba), magnesium (Mg), and aluminate (A12 O3) (BAM fluorescent substance), and a red luminescent substance, yttrium (Y) , Gallium (Ga), borate (BO3) and the like, and a white phosphor can be realized by a mixture thereof. Actually, white light is output by mixed color light of red light, green light, and blue light excited and emitted by ultraviolet light. Thus, when using ultraviolet LED, it is also possible to individually adjust RGB by using a plurality of phosphor sheets that individually emit R, G, and B.
Further, for example, in the case of a light source device that individually outputs R, G, and B colors, the chromaticity can be adjusted by a method similar to the method shown in FIG. If these adjusted RGB colors are mixed, the natural color can be reproduced more accurately.

FIG. 2 is a diagram for explaining a second embodiment of the light source device according to the present invention.
In the light source device of FIG. 2, a light emitting device 22 in which an LED as an excitation light source and a phosphor are packaged as shown in FIG. 11 is used as the light source, and other parts are the same as those in FIG.
When the light source device is configured as shown in FIG. 2, the chromaticity of the packaged LED light source is measured, and only those having chromaticity deviation are adjusted using two phosphor-containing members that are the technique of the present invention. It is possible to increase the non-defective product rate of the light source device significantly, which is effective in reducing the cost.

  Note that placing the first phosphor-containing member 14 in the package in advance has a great effect on production.

5, 6 and 7 are diagrams showing various patterns that can be used for the phosphor-containing members 12 and 14.
FIG. 5 is a diagram showing a second pattern that can be used for the phosphor-containing member, where (a) is a plan view showing the pattern, and (b) is a rotation of the phosphor-containing member having the pattern. It is a figure at the time of shifting.
The pattern of FIG. 5 is formed by a combination of a large circle 32 and a small circle 34 as shown in FIG. 5A, and as shown in FIG. 5B, two phosphor-containing members are rotated. As the position is shifted, the area ratio of the phosphor-containing portion increases.

FIG. 6 is a diagram showing a third pattern that can be used for the phosphor-containing member, where (a) is a plan view showing the pattern, and (b) is a rotation of the phosphor-containing member having the pattern. It is a figure at the time of shifting.
The pattern of FIG. 6 is formed by a lattice pattern as shown in FIG. 5A, and as shown in FIG. 6B, the phosphors are changed as the two phosphor-containing members are rotated and shifted. The area ratio of the included part changes.

FIG. 7 is a diagram showing fourth and fifth patterns that can be used for the phosphor-containing member.
FIG. 7A shows the fourth pattern, which is composed of a circle on a spiral.
FIG. 7B is a modification of the pattern shown in FIG. 3, in which a large number of rod-shaped phosphor-containing portions are arranged finer than in FIG.
Many patterns that can be applied in this way are conceivable, but the present invention is not limited to a specific pattern, and two or more phosphor-containing members are placed and the positional relationship of the phosphor-containing members is changed. This is characterized in that the chromaticity of the emitted light is adjusted.

FIG. 8 is a diagram showing a pattern example for adjusting the chromaticity by moving the phosphor-containing member substantially in parallel.
The pattern of FIG. 8 is formed by a large strip-shaped pattern as shown in FIG. 8 (a). As shown in FIG. 8 (b), two phosphor-containing members having the same pattern are almost formed. The area ratio of the portion containing the phosphor increases as the position is shifted in parallel. Therefore, the chromaticity can be adjusted.
As described above, in the present invention, the chromaticity can also be adjusted by moving the two phosphor-containing members substantially in parallel.

  FIG. 9 is a diagram showing a case where the patterns of the phosphor-containing portions of the first phosphor-containing member 14 and the second phosphor-containing member 12 are different, and the pattern 38 shown in FIG. The pattern of the first or second phosphor-containing member, and the pattern 40 shown in FIG. 9B is the pattern of the second or first phosphor-containing member. As in the case of FIG. 3, the hatched portion is a portion containing a phosphor.

FIG. 10 is a diagram showing a phosphor pattern when the first phosphor-containing member and the second phosphor-containing member having the patterns shown in FIGS. 9A and 9B are overlapped, FIG. 10A shows a case where the rotation is not performed, and FIG. 10B shows a case where the rotation is performed by 90 °. As is apparent from the figure, the area ratio of the portion including the phosphor changes between 0 ° and 90 °. Therefore, the chromaticity can be adjusted with the pattern shown in FIG.
Thus, the pattern of the part which has the fluorescent substance of the 1st fluorescent substance containing member and the 2nd fluorescent substance containing member may be the same, or may differ. How to set a specific pattern is a design problem.
Similarly, placing the first phosphor-containing member in the package indicated by 22 in FIG. 2 has a great effect on production.
Furthermore, if the pattern as shown in FIG. 9 is used, there is no problem even if the center points of the first and second phosphor-containing members are slightly shifted.

As described above, according to the present invention, the chromaticity of the light source device can be easily adjusted, and the quality of the light source device can be improved. Further, since adjustment is possible even after the light source device is packaged, the non-defective product rate of the light source device can be significantly increased, which is effective in reducing the cost.
In the adjustment, there can be various selections such as preparing members with various patterns, preparing members with various phosphor contents, and preparing members with various phosphor ratios.

It is a figure explaining the 1st Example of the light source device by this invention. It is a figure explaining the 2nd Example of the light source device by this invention. It is the figure which showed the example of the fluorescent substance containing member. It is a figure explaining the operation condition of the 1st and 2nd fluorescent substance containing member at the time of adjusting chromaticity of a light source device. It is the figure which showed the 2nd pattern which can be used for a fluorescent substance containing member. It is the figure which showed the 3rd pattern which can be used for a fluorescent substance containing member. It is the figure which showed the 4th, 5th pattern which can be used for a fluorescent substance containing member. It is the figure which showed the example of a pattern which moves a fluorescent substance containing member substantially parallel, and adjusts chromaticity. It is the figure which showed the case where the pattern of the part which has a fluorescent substance differs between the 1st fluorescent substance containing member and the 2nd fluorescent substance containing member. It is the figure which showed the pattern at the time of overlapping the pattern of FIG. It is sectional drawing of the conventional white LED.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light emission source 14 1st fluorescent substance containing member 12 2nd fluorescent substance containing member 22 Light emitting device which packaged excitation light source and fluorescent substance

Claims (10)

In a light source device that outputs excitation light of light emitted from a light source,
A first phosphor-containing member in which the phosphor is partially present;
A second phosphor-containing member in which the phosphor is partially present;
A light source device, wherein the first and second phosphor-containing members are stacked in the light emitting direction of the light source.   2. The light source according to claim 1, wherein the light source outputs mixed light of a light emission color of the light emitted from the light source and an excitation light color obtained by exciting the light emitted from the light source by the phosphor. apparatus.   The light source device according to claim 1, wherein the first phosphor-containing member and the second phosphor-containing member have the same shape and phosphors are distributed.   4. The light source device according to claim 3, wherein the second phosphor-containing member is rotated or moved substantially in parallel with the first phosphor-containing member. In the light source device that uses the excitation light of the light emitted from the light source and contains a fluorescent material that emits fluorescence and emits white light, on the light emitting device that packages the excitation light source and the phosphor,
A first phosphor-containing member in which the phosphor is partially present;
A second phosphor-containing member in which the phosphor is partially present;
A light source device, wherein the first and second phosphor-containing members are stacked in the light emitting direction of the light source.   The light source device according to claim 1, wherein the light source is a light emitting diode.   The light source device according to claim 6, wherein the light emitting diode is a blue light emitting diode, and the phosphor is a YAG body.   The light source is a light emitting diode that emits ultraviolet light, and the phosphor is a phosphor that emits red, green, and blue light, and is mixed with light of red light, green light, and blue light that is excited and emitted by the ultraviolet light. The light source device according to any one of claims 1 to 5, wherein In the adjustment method of the light source device that outputs the excitation light of the light emitted from the light emitting source,
A first phosphor-containing member in which the phosphor is partially present;
A second phosphor-containing member in which the phosphor is partially present,
Laminating the first and second phosphor-containing members in the light emitting direction of the light source,
By adjusting the angle or the amount of movement of the second phosphor-containing member relative to the first phosphor-containing member by rotating or substantially parallelly moving the second phosphor-containing member, A method of adjusting a light source device, wherein the chromaticity is adjusted by changing an area ratio of a visible phosphor. In the adjustment method of the light source device that outputs the excitation light of the light emitted from the light emitting source,
The excitation light source that emits the excitation light is packaged with a member containing a phosphor,
A first phosphor-containing member in which the phosphor is partially present;
A second phosphor-containing member in which the phosphor is partially present,
Laminating the first and second phosphor-containing members in the light emitting direction of the light source,
By adjusting the angle or the amount of movement of the second phosphor-containing member relative to the first phosphor-containing member by rotating or substantially parallelly moving the second phosphor-containing member, A method of adjusting a light source device, wherein the chromaticity is adjusted by changing an area ratio of a visible phosphor.

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