WO2013140484A1

WO2013140484A1 - Light-emitting device

Info

Publication number: WO2013140484A1
Application number: PCT/JP2012/008406
Authority: WO
Inventors: 順一木下
Original assignee: 東芝ライテック株式会社
Priority date: 2012-03-21
Filing date: 2012-12-27
Publication date: 2013-09-26
Also published as: JP2013225473A

Abstract

The light-emitting device is configured so that blue laser light emitted from a laser light source is input from the entrance face of an optical fiber and is emitted from the respective emission surfaces of branched first and second optical fibers. At the position facing the emission surface of the first optical fiber, a first light guide is disposed. In the process of guiding the laser light that has been input into the entrance face, a fluorophore layer is excited to generate a transformed light of a wavelength that differs from blue. The transformed light and the laser light are combined and emitted from the emission surface. At the position facing the emission surface of the second optical fiber, a second light guide is disposed. In the process of guiding the laser light that has been input into the entrance face, the light is scattered with a light-scattering processed section formed on the surface of the second light guide and is emitted from the emission surface.

Description

Light emitting device

Embodiments of the present invention relate to a light emitting device using a laser diode as a light source.

Conventionally, there has been considered a light-emitting device that obtains white light or a light bulb color by photosynthesis of emission in the wavelength range of ultraviolet light to visible light and wavelength-converted light emitted by phosphor particles that have absorbed the emission. As such a light emitting device, there is a surface mount device type structure in which phosphor particles are mixed and a sealing layer containing a transparent resin covers a nitride light emitting element chip.

In a surface-mounted device type light-emitting device, a phosphor-containing sealing layer covers the light-emitting element, and a part of blue light from the light-emitting element excites phosphor particles, and yellow light that is wavelength converter light is emitted. The Other parts of the blue light are transmitted or scattered through the sealing layer. The combination of yellow and blue light is emitted as pseudo white light. However, in this method, since the light emitting element itself and its mounting member are present inside the light emitting device, it is absorbed during multiple reflection and causes light loss. Thus, in the structure in which the phosphor-containing sealing layer covers the light emitting element, there is a limit to improving the efficiency of the light source.

In order to solve this problem, the present applicant has previously filed Japanese Patent Application No. 2010-246692. In this application, in order to excite the phosphor and obtain the visible light necessary for illumination, the output of the blue laser light source is optically coupled from one end of the fiber and the wide light guide disposed on the other end side. The light is incident, and a yellow phosphor layer is disposed on the lower side of the side surface, and a white reflective layer is further formed thereon. The blue light incident on the light guide excites the yellow phosphor layer while guiding the light, generates yellow wavelength converted light, and combines the blue wavelength scattered light and the yellow wavelength converted light by the phosphor. A spectrum of white light suitable for illumination is obtained, and the upper side of the light guide is irradiated by the reflective layer.

However, this lighting device has a problem that the chromaticity of the illumination light is uniquely determined from the combination of the blue laser light source and the phosphor.

JP 2000-275444 A

In this embodiment, a light emitting device having a plurality of emission colors and high color rendering properties is provided.

According to the embodiment, the light source device includes a light source unit and a light emitting unit, wherein the light source unit receives a laser light source that emits laser light and the laser light from a light incident surface. A light guide unit that emits light from each emission surface, and the light emitting unit is disposed opposite to the first emission surface to excite the phosphor layer in the process of guiding the incident laser light, A first light guide that generates converted light having a wavelength different from the wavelength of the laser light from the phosphor layer, synthesizes and emits the converted light and the laser light, and the second emission surface. A second light guide that is disposed to face and emits and emits the laser light.

It is a typical perspective view for demonstrating 1st Embodiment regarding a light-emitting device. It is a longitudinal cross-sectional view of the principal part of FIG. It is a partially cutaway side view of the main part of FIG. FIG. 2 is a sectional view taken along line Ia-Ib in FIG. 1. It is a typical block diagram for demonstrating 2nd Embodiment regarding a light-emitting device. It is a schematic block diagram for demonstrating 3rd Embodiment regarding a light-emitting device. It is a block diagram for demonstrating the modification of 3rd Embodiment. It is sectional drawing for demonstrating the modification of the principal part of this embodiment. It is a longitudinal cross-sectional view for demonstrating the other modification of the principal part of this embodiment. FIG. 10 is a longitudinal sectional view taken along line IIa-IIb in FIG. 9. It is a typical perspective view partly notched for demonstrating 4th Embodiment regarding a light-emitting device. It is a side view of FIG. 12 is an enlarged side view showing the main part. It is a typical disassembled perspective view for demonstrating the modification of 4th Embodiment. It is sectional drawing of the principal part for demonstrating 5th Embodiment regarding a light-emitting device. It is sectional drawing which expands and shows the principal part of FIG. It is a typical perspective view for demonstrating 6th Embodiment. FIG. 17 is an enlarged side view showing a main part. 17 is an enlarged perspective view showing another example of the main part. FIG. 20 is a top view of FIG. 19. It is a typical perspective view for explaining a 7th embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings. In the drawings described below, components having the same function are denoted by the same reference numerals, and repeated description is omitted.

(First embodiment)
FIG. 1 is a schematic perspective view for explaining a first embodiment relating to a light emitting device. FIG. 2 is a longitudinal sectional view of the main part of FIG. FIG. 3 is a partially cutaway side view of the main part of FIG. 4 is a cross-sectional view taken along line Ia-Ib of FIG.

The light emitting device 100 includes a light source unit 110 and a light emitting unit 120. The light source unit 110 includes, for example, a laser light source 11 that emits laser light 11 a in a wavelength range (blue) from blue violet to blue, and an optical fiber 12 that is a light guide unit provided apart from the laser light source 11.

The light emitting unit 120 includes

first light guides

131 and 132, a reflector 14, a phosphor layer 15, a reflective layer 16, a second light guide 17 constituting the light emitting unit, and a reflector 18. In addition, as a light guide part, not only an optical fiber but a light guide may be sufficient.

The optical fiber 12 is composed of optical fibers 121 to 123 which are first to third light guide portions branched, for example, from the branch portion 12a. The branch is designed to gradually branch so that the guided light does not leak easily. Blue laser light is incident on the light incident surface 12 b of the optical fiber 12 from the emission surface of the laser light source 11. The laser light source 11 is formed of a nitride semiconductor material that can emit blue laser light.

For example, the size of the emission point of the laser beam 11a can be narrowed to 10 μm or less, the full width at half maximum in the vertical direction is 30 degrees, and the full width at half maximum in the horizontal direction can be narrowed to 10 degrees. For this reason, if light is collected using a lens (not shown) having a diameter of about several millimeters, the light can easily enter the optical fiber 12.

The first optical fiber 121 branched from the branching portion 12a of the optical fiber 12 has an emission surface 12c1 on the side opposite to the light incident surface 12b. The third optical fiber 123 branched from the branch portion 12a of the optical fiber 12 has an emission surface 12c2 on the side opposite to the light incident surface 12b. The second optical fiber 122 branched from the branching portion 12a has an emission surface 12d on the side opposite to the light incident surface 12b. The laser beam 11a incident on the light incident surface 12b of the optical fiber 12 is emitted from the respective emission surfaces 12c1, 12d, 12c2 of the first and second

optical fibers

121, 122, 123.

The light incident surface 13 a at one end of the first light guide 131 is disposed opposite to the emission surface 12 c 1 of the first optical fiber 121. The light incident surface 13 a at one end of the first light guide 132 is disposed opposite to the emission surface 12 c 2 of the third optical fiber 123.

The first light guide 131 into which the laser light 11a of the first optical fiber 121 is incident and the first light guide 132 into which the laser light 11a of the third optical fiber 123 is incident are substantially the same configuration. It has a cylindrical shape. The

first light guides

131 and 132 are arranged in parallel to each other.

The first light guides 131 and 132 are glass rods having a circular cross section with a diameter of 2 mm and a length of 600 mm, for example. In addition, even when the first light guides 131 and 132 are air layers, the light incident surface 13a represents the same position.

The reflectors 14 are attached to the other ends of the first light guides 131 and 132, respectively. The reflector 14 serves to reflect the laser light 11a incident from the light incident surface 13a of the first light guides 131 and 132 and return it to the first light guides 131 and 132 side again. The first light guides 131 and 132 are made of a transmissive material, and for example, transparent resin or glass is used. Or an air layer may be sufficient.

The flat surface 13b is formed in the lower part of the outer peripheral surface of the first light guides 131 and 132 along the longitudinal direction. A phosphor layer 15 is formed on the flat surface 13b. The phosphor layer 15 is formed by using, for example, yellow phosphor particles such as YAG: Ce, and dispersing and dispersing the phosphor particles in a transparent resin, glass, or the like, and applying and curing on the flat surface 13b. Further, the phosphor particles may be provided directly on the reflector 14 by printing or printing.

When the phosphor layer 15 is extended along the longitudinal direction of the first light guides 131 and 132, the light density from the laser light source 11 is reduced, and deterioration of the phosphor itself can be suppressed. The first light guides 131 and 132 are not limited to a cylindrical shape, and may be a rectangular parallelepiped, for example. In the case of a rectangular parallelepiped, the amount of emitted light can be increased by forming a reflector excluding the surface emitted from the light guide. The width of the phosphor layer 15 is about 0.2 mm, which is smaller than the width of the first light guides 131 and 132 (diameter 2 mm).

A reflection layer 16 having a function of a reflector is provided outside the phosphor layer 15. The reflective layer 16 is made of a metal material such as aluminum, and the surface thereof is formed of a mirror-finished reflective surface. Alternatively, a reflective sheet may be attached to a material having low reflectivity to form the reflective layer 16.

The light incident surface 17 a at one end of the cylindrical second light guide 17 is disposed opposite to the emission surface 12 d of the second optical fiber 122. The second light guide 17 is smaller than the diameter of the first light guides 131 and 132, and is disposed in parallel between the first light guides 131 and 132. As shown in FIGS. 3 and 4, a diffusing agent that scatters light is enclosed inside the second light guide 17. The light scattering processing section 17b is formed by diffusion coating or cutting flaws having a pattern with an appropriate shape.

The light introduced into the second light guide 17 is diffused by the light scattering processing unit 17b and emitted from the surface of the second light guide 17 that is perpendicular to the light introduction direction. The light scattering processing unit 17b may be formed in a pattern in which a diffusion paint is applied.

A reflector 18 is attached to the other end of the second light guide 17. The reflector 18 serves to reflect the laser light 11a incident from the light incident surface 17a of the second light guide 17 and return it again to the second light guide 17 side. The second light guide 17 is made of a transmissive material, and for example, transparent resin or glass is used. Or an air layer may be sufficient.

Here, the branched laser light 11a is incident on the first light guides 131 and 132 and the second light guide 17, and then the first light guides 131 and 132 and the second light guide. The operation of the body 17 will be described.

First, part of the blue laser light 11a incident on the light incident surfaces 13a of the first light guides 131 and 132 excites the phosphor layer 15 and emits wavelength-converted light. From the emission surfaces of the first light guides 131 and 132, blue scattered light and wavelength-converted light are directly emitted, or reflected by the surface of the phosphor and the reflection layer 16, and then on the side opposite to the reflection layer 16. The light is emitted from the emission surface 13c of the first light guides 131 and 132.

As shown in FIG. 2, the pseudo white light obtained by combining the blue scattered light and the wavelength converted light emitted from the phosphor layer 15 is reflected directly or on the reflection surface in the first light guides 131 and 132. After that, the light is emitted from the emission surface 13 c of the first light guides 131 and 132. The emission surface 13c is a region above the broken line mn of the first light guide 13. The first light guides 131 and 132 have a circular cross-sectional shape that functions as a collimating lens for a thin light emitting region that emits pseudo white light. When the shapes of the phosphor layer 15 and the reflective layer 16 are changed, the light emission distribution can be controlled along the light guide direction of the first light guides 131 and 132.

Next, the blue laser light 11 a incident on the light incident surface 17 a of the second light guide 17 guides the second light guide 17. The laser light 11a in the second light guide 17 is gradually scattered in the entire circumferential direction along the light guide direction and emitted by the light scattering processing unit 17b. Accordingly, blue light is emitted from the second light guide 17. Further, the laser light 11a reflected by the reflector 18 and guided in the direction returning to the light incident surface 17a is also gradually scattered and emitted in the entire circumferential direction by the light scattering processing unit 17b. The second light guide 17 emits blue light based on the blue laser light 11a.

Thus, white light is emitted from the first light guides 131 and 132, and blue light is emitted from the second light guide 17. These lights are mixed with each other to enhance color rendering.

In this embodiment, by using a branched optical fiber and a plurality of light guides, it is possible to realize a light-emitting light source having a plurality of light-emitting colors and a high color rendering property.

(Second Embodiment)
FIG. 5 is a schematic configuration diagram for explaining a second embodiment related to the light-emitting device.

In this embodiment, the blue laser light 11a emitted from the laser light source 11 is distributed to the first optical fiber 121a and the second optical fiber 122a with the rotating mirror 51 around the rotating shaft 52.

The light source unit 110 includes a laser light source 11, a rotating mirror 51, and

optical fibers

121a and 122a, and the light emitting unit 120 includes a first light guide 13 and a second light guide 17.

When the rotating mirror 51 is in the first position, the laser light 11a emitted from the laser light source 11 enters the light incident surface 121b of the first optical fiber 121a. The light guided through the first optical fiber 121 a is emitted from the emission surface 12 c and enters the light incident surface 13 a of the first light guide 13.

When the rotating mirror 51 is in the second position, the laser light 11a emitted from the laser light source 11 is incident on the light incident surface 122b of the second optical fiber 122a. Then, the light is emitted from the emission surface 12 d of the second optical fiber 122 a and enters the light incident surface 17 a of the second light guide 17.

Thus, the rotating mirror 51 is rotated around the rotating shaft 52 so as to be in the first and second positions. Thereby, either the optical fiber 121 and the first optical fiber 121a or the second optical fiber 122a can be selectively optically coupled. The common laser light source 11 emits white light from the first light guide 13 and emits blue light from the second light guide 17. The emitted light from the first light guide 13 and the second light guide 17 can be switched and illuminated.

The rotating mirror 51 is a polygon mirror, a MEMS (Micro Electro Mechanical Systems) mirror that scans the light emitted from the laser light source toward the irradiated object, a refractive index biased scanner (acousto-optic effect, electro-optic effect), etc. Can be substituted.

Further, the rotating mirror 51 is rotated and switched to the first optical fiber 121a and the second optical fiber 122a so as to receive light. Not limited to this, the angle of the rotating mirror 51 is fixed, and the position is changed so that the first optical fiber 121a and the second optical fiber 122a or more optical fibers can selectively enter light. Good. In this case, more various colors of emitted light can be obtained.

In the embodiment of this embodiment, since a rotating mirror is used, a light emitting light source having a plurality of emitting colors is realized by emitting light whose emission color changes by periodically changing the angle of the rotating mirror. Can do.

In this embodiment, only one first light guide 13 is used, but two may be used as in the first embodiment.

(Third embodiment)
FIG. 6 is a schematic configuration diagram for explaining a third embodiment related to the light-emitting device. In this embodiment, an optical directional branching unit is used instead of the rotating mirror of the second embodiment to branch from one optical fiber.

At the other end of the optical fiber 121 facing the laser light source 11, a directional branching device 60 composed of a prism 61a and a mirror 61b is installed. The blue laser light 11 a from the laser light source 11 enters the prism 61 a of the directional branch device 60. In the prism 61a, the laser light 11a is made to travel straight and enter the light incident surface 13a of the first light guide 13 through the first optical fiber 121a. Further, the spectrum reflected to the right side in the drawing by the reflecting surface of the prism 61a is reflected by the reflecting plate 61b and enters the light incident surface 17a of the second light guide 17 through the second optical fiber 122a. .

Thereby, for example, the first light guide 13 emits pseudo white light when a phosphor that converts the blue laser light 11a to yellow is used. The second light guide 17 scatters and emits the blue laser light 11a. An illumination device that emits light of different colors can be obtained from the first light guide 13 and the second light guide 17.

In the case of this embodiment, it is also possible to select the light emitted from the first light guide 13 and the light emitted from the second light guide 17 by using a shutter.

FIG. 7 is a schematic configuration diagram for explaining a modified example in which the directional branching means of the third embodiment is multi-staged and the number of different emission colors can be increased.

In the directional branching device 601, the number of prisms and reflectors is increased. The blue laser light 11 a from the laser light source 11 enters the prism 61 a of the directional branch device 60. The prism 61a advances the laser beam 11a straight and enters the light incident surface 13a1 of the first light guide 131 via the first optical fiber 121a1. Further, the spectrum reflected to the right side in the figure by the reflecting surface of the prism 61a is reflected by the reflecting plate 61b. The laser beam 11a reflected by the reflecting plate 61b travels straight by the second prism 62a and enters the light incident surface 17a of the second light guide 17 through the second optical fiber 122a. The light reflected by the reflecting surface of the second prism 62a (right side in the figure) is reflected by the reflecting plate 62b and enters the light incident surface 13a2 of the first light guide 132 through the third optical fiber 121a2. To do.

In this case, laser light emitted from one optical fiber can be incident on three light guides. Furthermore, the light emission colors of the respective light guides can be different, and light having different light emission colors can be obtained. By increasing the number of prisms and reflectors, it is possible to install four or more light guides, and it is possible to realize a lighting device having a plurality of emission colors.

FIG. 8 is a cross-sectional view for explaining a modification of the first light guide 13 of each of the above-described embodiments. In this modification, the flat surface 13b of the first light guide 13 is eliminated, the spherical surface is made the same as the other side surfaces, and the phosphor layer 151 is also curved.

In this case, the light whose chromaticity has been converted by the phosphor layer 151 can emit the light directly emitted from the emission surface 13c and the light reflected and collected by the reflection layer 161. The illuminance emitted from the light body 13 can be increased.

FIG. 9 is a longitudinal sectional view for explaining a modification of the second light guide body 17 of each of the above-described embodiments, and FIG. 10 is a longitudinal sectional view taken along the line IIa-IIb in FIG.

In this modification, the reflective layer 101 is formed on the remaining part of the emission surface 17c in order to emit light in a specific direction from the light scattering processing unit 17b.

The laser light 11a in this case is emitted by photosynthesis of the light scattered from the light scattering processing section 17b and the light emitted directly from the light emission surface 17c and the light reflected from the reflection layer 101 and emitted from the light emission surface 17c. The amount of light emitted can be increased by emitting the emitted light together with the amount of reflection of the reflective layer 101 rather than the amount of light emitted only by the light scattering processing unit 17b.

(Fourth embodiment)
11 to 13 are for explaining a fourth embodiment relating to the light emitting device. FIG. 11 is a schematic perspective view with a part cut away, FIG. 12 is a side view of FIG. 11, and FIG. It is an enlarged view of the principal part.

In this embodiment, the common light reflector 70 reflects the light emitted from the first light guide body 13 and the second

light guide bodies

171 and 172, respectively. The reflector 70 is composed of three substantially U-shaped reflecting

surfaces

701, 702, and 703 that leave the emitting surface 13 c of the first light guide 13 and the emitting surface 17 c of the second light guides 171 and 172. Composed.

In the center of the reflector 70, the first light guide 13 is disposed. The second light guides 171 and 172 having a smaller diameter than the first light guide 13 are disposed at positions where they are combined with the light emitted from the first light guide 13.

Further, as shown in FIG. 13, the second light guide 171 is provided with a light scattering processing section 17b in a part in the circumferential direction. The light scattering processing unit 17 b is disposed so that the emitted light faces the first light guide 13. As a result, the light emitted from the second light guide 171 in a specific direction and the light emitted from the first light guide can be emitted as light synthesized from the opening 704 of the reflector 70. . The light scattering processing unit 17 b is also applied to the second light guide 172 so that the scattered light is directed to the first light guide 13.

In this embodiment, the reflected light emitted from the first light guide 13 and the second light guides 171 and 172 is reflected using a common reflector. For this reason, it is possible to suppress leakage of the light emitted from the opening of the reflector to the other, which contributes to improvement in light emission efficiency.

FIG. 14 is a schematic exploded perspective view for explaining a modification of the fourth embodiment. In this modification, a plurality of light emitting devices of the second embodiment are connected, and a diffusion plate 80 that diffuses light emitted from the respective openings 704 is disposed. In this case, it can be used as illumination or backlight with high brightness by a laser light source.

(Fifth embodiment)
FIGS. 15 and 16 are for explaining a fifth embodiment relating to the light emitting device. FIG. 15 is a schematic cross-sectional view of the main part, and FIG. 16 is an enlarged cross-sectional view of the main part of FIG. FIG.

In this embodiment, the emission surface 17c of the second light guide 17 is disposed toward a position opposite to the emission surface 13c of the first light guide 13. On both sides of the second light guide 17, phosphor layers 15 </ b> R and 15 </ b> G whose upper surfaces are attached to the first light guide 13 are disposed.

Reflective layers

16a and 16b are disposed on the lower surfaces of the phosphor layers 15R and 15G.

The phosphor layers 15R and 15G are of different types. For example, the phosphor layer 15R is formed of a phosphor that emits red light as wavelength-converted light by excitation of the laser light 11a. The phosphor layer 15G is formed of a phosphor that emits green light as wavelength-converted light by excitation of the laser light 11a.

Further, as shown in FIG. 16, the second light guide 17 is provided with a light scattering processing unit 17 b so as to emit light toward the first light guide 13. The light scattering processing unit 17b is the emission surface 17c.

The laser light guided through the second light guide 17 is emitted through the light scattering processing unit 17b as the emission surface 17c. The emitted light excites the phosphor layers 15R and 15G and is emitted from the emission surface 13c of the first light guide 13 as wavelength converted light. Further, the laser light guided through the first light guide 13 excites the phosphor layers 15R and 15G, reflects the reflected light at the reflecting

layers

16a and 16b as wavelength converted light, and emits the light from the emission surface 13c. At this time, the phosphor layer 16a is a light emitter that is excited by the laser light 11a and emits light in the red wavelength band. The phosphor layer 16b is a light emitter that is excited by the laser light 11a and emits light in the green wavelength band.

Then, from the emission surface 13c of the first light guide, the red light emitted from the phosphor layer 16a, the green light emitted from the phosphor layer 16b, and the blue light emitted from the second light guide 17 are combined. Emits white light.

In this embodiment, since the second light guide is arranged side by side at the position of the phosphor layer, it is possible to save the space for installing the second light guide. For this reason, since many 1st light guides can be arranged in a small area, a high-intensity light-emitting device is realizable.

(Sixth embodiment)
FIG. 17 is a schematic perspective view for explaining the sixth embodiment. In this embodiment, the laser light source of the first embodiment is used as a first light source, and light in which the output of a second light source that emits a different wavelength is optically combined is incident on a common optical fiber. Is.

Specifically, as shown in FIG. 17, a laser light source 111 is incident on a common optical fiber 12 as a second light source that emits a wavelength different from the laser light of the laser light source 11. A prism 171 is disposed between the

laser light sources

11 and 111 and the optical fiber 12. The second light source need only be different from the wavelength of the first light source, and may be not only a laser light source but also a light emitting diode, for example.

As shown in FIG. 18, the prism 171 is incident on the light incident surface 12 b of the optical fiber 12 by directing the laser light 11 a of the laser light source 11. The prism 171 reflects the laser beam 111 a of the laser light source 111 by the reflecting surface 172 and enters the incident surface 12 b of the optical fiber 12.

FIG. 19 shows an example in which a light guide unit 191 is used instead of the prism 171. The light guide unit 191 is disposed between the

laser light sources

11 and 111 that emit laser beams having different wavelengths and the optical fiber 12.

As shown in FIG. 20, the light guide 191 includes a light incident surface 192 and an output surface 193, and is formed so as to become gradually narrower from the light incident surface 192 to the output surface 193. Laser

light sources

11 and 111 that emit different wavelengths are disposed on the light incident surface 192. The laser beams of the

laser light sources

11 and 111 are incident on the light incident surface 12 b of the optical fiber 12 from the emission surface 193.

The

laser beams

11a and 111a are guided from the light incident surface 192 side to the light emitting surface 193 side while repeating total reflection inside the light guide 191. As a result, the

laser beams

11 a and 111 a of the

laser light sources

11 and 111 can enter the common optical fiber 12.

In addition, although the example which has arrange | positioned the two

laser light sources

11 and 111 was given to the light-incidence surface 192 of the light guide part 191, it is possible to arrange | position three or more laser light sources.

(Seventh embodiment)
FIG. 21 is a schematic perspective view for explaining the seventh embodiment. The optical fiber 12 of the first embodiment has a common light incident surface 12b and is branched from the middle to have a plurality of light exit surfaces.

In this embodiment, light of different wavelengths is incident on a plurality of single optical fibers.

As shown in FIG. 21, the optical fiber 121 receives laser light 11a from the laser light source 11 as the first light source. The optical fiber 122 receives light 112 a that is a second light source, for example, from a light emitting diode 112.

The second light guide 17 forms a flat portion 17d like the first light guide 13, and a light scattering layer 17e and a reflection layer 17f are laminated on the flat portion 17d.

The light incident on the second light guide 17 from the light incident surface 17a via the optical fiber 122 is scattered by the light scattering layer 17e. The scattered light is emitted from the radiation surface 17c, and the light reflected by the reflection layer 17 is emitted from the radiation surface 17c.

It should be noted that the second light source need only be different from the wavelength of the first light source, and may be a laser light source other than the light emitting diode 112. In this case, the laser light cannot be directly emitted, so that it is necessary to generate light having a wavelength converted using a fluorescent material like the first light guide 13.

It is not limited to the above-described embodiment. For example, blue laser light is scattered and emitted in the second light guide, but a phosphor may be used as in the first light guide. In this case, it is also possible to obtain light emission having a chromaticity different from that of the first light guide using the phosphor by changing the composition and type of the phosphor. If a red phosphor is used, red and magenta can be emitted, and if a green phosphor is used, green and blue-green can be emitted. Furthermore, it is possible to realize a single illumination system in which light emission of a white color having a high color temperature and a light bulb color having a low color temperature are simultaneously synthesized.

Although several embodiments have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 100 Light-emitting device 110 Light source part 120 Light-emitting part 11,111 Laser

light source

11a, 111a Laser light 12,121 Optical fiber (light guide part)
12a Branch part 121,121a, 121a1,121a2 1st optical fiber (1st light guide part)
122, 122a Second optical fiber (second light guide)
12b, 13a, 17a, 121b, 122b, 83a Light incident surface 12c, 12c1, 12c2, 12d, 13c,

17c Emitting surface

13, 131, 132 First light guides 14, 18, 70 Reflector 15

Phosphor layer

16 , 161, 101, 17f

Reflective layer

17, 171, 172 Second light guide 17b Light scattering processing unit 17e Light scattering layer 51

Rotating mirror

60, 601 Directional branching

device

61a,

62a Prism

61b, 62b Mirror 83 Third Light guide 171 prism 191 light guide

Claims

A light emitting device comprising a light source part and a light emitting part,
The light source unit includes a laser light source that emits laser light, and a light guide unit that receives the laser light from a light incident surface and emits the laser light from first and second light emission surfaces,
The light emitting unit is disposed opposite to the first emission surface, excites the phosphor layer in the process of guiding the incident laser beam, and has a wavelength different from the wavelength of the laser beam from the phosphor layer. A first light guide that generates converted light, synthesizes and emits the converted light and the laser light, and is disposed opposite to the second emission surface, and receives and emits the laser light. A light-emitting device.
The light guiding unit includes a common light incident surface on which the laser light is incident, a branching portion that branches the laser light incident from the light incident surface into a plurality of portions, and the laser light branched from the branching portion. The light-emitting device of Claim 1 provided with the 1st and 2nd discharge | release surface which discharge | releases.
The light guide unit includes a first light incident surface on which the laser light is incident, and a first light emission surface that guides and emits the laser light incident from the first light incident surface. A first light guide unit that performs light input, a second light incident surface that receives the laser light, and a second light emission surface that guides and emits the laser light incident from the first light incident surface. The light-emitting device of Claim 1 provided with the 2nd light guide part which comprises these.
The light emitting device according to claim 1, wherein the second light guide is subjected to a light scattering processing for scattering and emitting the incident laser light.
The light emitting device according to claim 1, further comprising: a phosphor layer that is excited when the laser light guides the second light guide, and obtaining emitted light whose wavelength is converted from the second light guide. apparatus.
The light emitting device according to claim 5, wherein the phosphor layer that excites the laser light guided through the first and second light guides and converts the wavelength of the laser light is of a type that converts different wavelengths. .
6. The light emitting device according to claim 5, wherein a reflective layer is disposed outside the phosphor layer for converting the wavelength of the laser light guided through the first and second light guides.
The light emitting device according to claim 3, wherein the laser light is selectively incident on the first or second light guide.
4. The light emitting device according to claim 3, wherein a common light guide portion is interposed between the light incident surface of the first or second light guide portion and the light source portion.
The light-emitting device according to claim 1, further comprising a reflector that also reflects light emitted from the first and second light guides.
The phosphor excited by the laser light guided to the first light guide is arranged in a first region and a second region divided in the longitudinal direction of the first light guide, The second light guide is disposed between the first region and the second region, and the emission light of the second light guide and the excitation light of the phosphor divided The light-emitting device according to claim 1, wherein the light-emitting devices are synthesized and emitted from the first light guide.
Different types of the divided phosphors, excitation light of different colors that can be excited by the laser light that guides the first light guide, and emission light from the second light guide The light-emitting device according to claim 11, which is synthesized and emitted from the first light guide.
A second light source that emits second light having a wavelength different from that of the laser light;
The light emitting device according to claim 1, wherein the second light is incident on the first light guide and the second light guide together with the laser light.
A first light source that emits first light from a laser;
A second light source that emits second light having a wavelength different from that of the first light;
A first light guide unit that receives and guides the first light from a first light incident surface, and emits the first light from a first light emission surface;
A second light guide unit that receives and guides the second light from a second light incident surface, and emits the second light from a second light emission surface;
The phosphor layer is disposed in opposition to the first emission surface of the first light guide portion and guides the incident laser light, and the wavelength of the laser light from the phosphor layer is determined. A first light guide that generates converted light of different wavelengths, combines the converted light and the laser light, and emits the light;
A second light guide that is disposed opposite to the second emission surface of the second light guide and that receives and emits the second light.
The light-emitting device according to claim 14, wherein the second light guide is subjected to a light scattering processing for scattering and releasing the incident second light.
The light-emitting device according to claim 1, wherein a diffusion plate for diffusing the emitted light is disposed at a position where the emitted light from the first and second light guides is emitted.
The light-emitting device according to claim 14, wherein a diffusion plate for diffusing the emitted light is disposed at a position where the emitted light from the first and second light guides is emitted.