JP2015111309A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact general-purpose light source device with a simple device configuration, and a projector.SOLUTION: A light source device includes: a substrate 41 which is rotated around a predetermined rotation axis 48; first and second phosphor layers 45R and 45G arranged on a first principal surface of the substrate 41; and a light source which emits excitation light for exciting the first phosphor layer 45R and excitation light for exciting the second phosphor layer 45G. The first phosphor layer 45R is arranged in a first annular region AR1 around the rotation axis 48 of the substrate 41. The second phosphor layer 45G is arranged in a second annular region AR2 outside the first annular region AR1. The light source device emits first fluorescence emitted from the first phosphor layer 45R and second fluorescence emitted from the second phosphor layer 45G.

Description

  The present invention relates to a light source device and a projector.

  In recent years, a light source device including a light source that emits excitation light and a phosphor layer that emits fluorescence when excited by the excitation light emitted from the light source is known. As such a light source device, for example, there is a configuration in which one type of phosphor layer is disposed on a rotating substrate.

  By the way, when the structure of the light source device is a structure in which only one type of phosphor layer is disposed on the rotating substrate, when performing color display in R, G, and B, B light is used as excitation light, R light, In order to obtain the G light as the first fluorescence and the second fluorescence, respectively, a plurality of rotating substrates are required. If a plurality of rotating substrates are provided, the apparatus configuration becomes complicated and it is difficult to reduce the size of the apparatus.

  On the other hand, the light source device of Patent Document 1 has a configuration in which two types of phosphor layers are arranged on a rotating substrate. Three segment regions are formed on the rotating substrate along the rotation direction. Two types of phosphor layers that emit different colored lights (red light and green light) are formed in two of the three segment areas, and excitation light (blue light) is emitted in the remaining segment areas. Scattering scatterers are formed. Thereby, three colored lights can be emitted sequentially using the excitation light and the two types of phosphor layers.

JP 2009-277516 A

  However, since the light source device of Patent Document 1 is configured to emit red, green, and blue light in a time-sharing manner, a liquid crystal that uses a liquid crystal light valve that forms an image by modulating white light as an image forming unit of a projector. It is not suitable for a projector and its use is limited.

  SUMMARY An advantage of some aspects of the invention is that it provides a light source device and a projector that can be used for general purposes while simplifying the device configuration and reducing the size of the device. To do.

  In order to solve the above-described problems, a light source device of the present invention includes a substrate that can rotate around a predetermined rotation axis, a first phosphor layer provided on a first main surface of the substrate, and a second fluorescence. A light source that emits excitation light that excites the first phosphor layer and excitation light that excites the second phosphor layer, and the first phosphor layer is formed on the substrate. Provided in a first annular region around the rotation axis, and the second phosphor layer is provided in a second annular region on the outer periphery side of the first annular region, from the first phosphor layer The first fluorescence emitted and the second fluorescence emitted from the second phosphor layer are emitted.

  In this light source device, since the plurality of phosphor layers are collected on the same substrate, it is easy to reduce the size of the device. The plurality of phosphor layers are provided concentrically around the rotation axis of the substrate. For this reason, even if the irradiation position of light changes due to rotation of the substrate, each phosphor layer is continuously irradiated with light. Therefore, a plurality of color lights can be extracted at the same time, and can be used for general purposes.

  In the light source device, the substrate may be made of a material that transmits both excitation light for exciting the first phosphor layer and excitation light for exciting the second phosphor layer.

  According to this light source device, a transmissive configuration can be realized. In addition, excitation light is incident on the first phosphor layer and the second phosphor layer through the substrate. For this reason, compared with the structure which excitation light injects directly into the 1st fluorescent substance layer and the 2nd fluorescent substance layer, it suppresses that a fluorescent substance becomes high temperature and suppresses the fall of the conversion efficiency to fluorescence. be able to.

  The light source device may include a light guide optical system that divides excitation light for exciting the first phosphor layer from the light source and excitation light for exciting the second phosphor layer.

  According to this light source device, there is no need to separately provide a light source that emits excitation light incident on the first phosphor layer and a light source that emits excitation light incident on the second phosphor layer. That is, excitation light can be incident on the first phosphor layer and the second phosphor layer with a simple configuration in which only one light source is provided.

  In the light source device, the light guide optical system includes a first mirror and a second mirror, and the first mirror transmits a part of light emitted from the light source toward the second mirror. And the remaining part is reflected toward the first phosphor layer, and the second mirror reflects the light transmitted through the first mirror toward the second phosphor layer. The angle formed by the line connecting the center of the first mirror and the rotation axis and the line connecting the center of the second mirror and the rotation axis is 90 degrees or more when viewed from the direction orthogonal to the first main surface It may be 270 degrees or less.

  According to this light source device, since the distance between the first mirror and the second mirror can be increased, the physical interference between the first mirror and the second mirror even when the diameter of the substrate is relatively small. Can be suppressed.

  In the light source device, a first synthesis optical system that synthesizes the first fluorescence emitted from the first phosphor layer and the second fluorescence emitted from the second phosphor layer. You may have.

  According to this light source device, the configuration of the optical system can be simplified as compared with the case where the first fluorescence and the second fluorescence are separately guided toward the illumination target region.

  In the light source device, the first combining optical system includes a third mirror and a fourth mirror, and the third mirror emits the second fluorescence emitted from the second phosphor layer. Reflecting toward the fourth mirror, the fourth mirror may reflect the first fluorescence and transmit the second fluorescence reflected by the third mirror.

  According to this light source device, the first fluorescence emitted from the first phosphor layer and the second fluorescence emitted from the second phosphor layer are synthesized with a simple configuration in which only two mirrors are provided. can do.

  In the light source device, the substrate reflects both the first fluorescence emitted from the first phosphor layer and the second fluorescence emitted from the second phosphor layer. The first phosphor layer is provided on the same side as the side on which excitation light for exciting the first phosphor layer of the substrate is incident, and the second phosphor layer is The substrate may be provided on the same side as the side on which excitation light for exciting the second phosphor layer is incident.

  According to this light source device, a reflective configuration can be realized.

  In the light source device, excitation light that excites the first phosphor layer from the light source and excitation light that excites the second phosphor layer are divided and emitted from the first phosphor layer. In addition, a second synthesis optical system that synthesizes the first fluorescence and the second fluorescence emitted from the second phosphor layer may be provided.

  According to this light source device, excitation light is incident on the first phosphor layer and the second phosphor layer with a simple configuration in which only one light source is provided, and the light is emitted from the first phosphor layer. The first fluorescence and the second fluorescence emitted from the second phosphor layer can be synthesized.

  In the light source device, the second synthesis optical system includes a part of light emitted from the light source, the first fluorescence emitted from the first phosphor layer, and the second phosphor layer. And the second fluorescence emitted from the light source may be synthesized.

  According to this light source device, excitation light is incident on the first phosphor layer and the second phosphor layer with a simple configuration in which only one light source is provided, and a part of the light emitted from the light source. And the first fluorescence emitted from the first phosphor layer and the second fluorescence emitted from the second phosphor layer can be synthesized.

  In the light source device, the second combining optical system includes a first mirror, a second mirror, a third mirror, and a fourth mirror, and the first mirror is configured to transmit light emitted from the light source. A part is transmitted toward the second mirror and the remaining part is reflected toward the first phosphor layer, and the first fluorescence emitted from the first phosphor layer is reflected. Transmitted toward the fourth mirror, and the second mirror reflects the light transmitted through the first mirror toward the second phosphor layer and is emitted from the second phosphor layer. The second fluorescence is transmitted toward the third mirror, the third mirror reflects the second fluorescence transmitted through the second mirror toward the fourth mirror, and the fourth mirror is The first fluorescence transmitted through the first mirror is transmitted and the first fluorescence is transmitted. It may be reflected a second fluorescence reflected by the mirror.

  According to this light source device, excitation light is incident on the first phosphor layer and the second phosphor layer with a simple configuration in which only four mirrors are provided, and the light is emitted from the first phosphor layer. The first fluorescence and the second fluorescence emitted from the second phosphor layer can be synthesized.

  In the light source device, as viewed from a direction orthogonal to the first main surface of the substrate, a line connecting the center of the first mirror and the rotation axis, and a line connecting the center of the second mirror and the rotation axis May be 90 degrees or more and 270 degrees or less.

  According to this light source device, since the distance between the first mirror and the second mirror can be increased, the physical interference between the first mirror and the second mirror even when the diameter of the substrate is relatively small. Can be suppressed.

  In the light source device, as viewed from a direction orthogonal to the first main surface of the substrate, a line connecting the center of the third mirror and the rotation axis, and a line connecting the center of the fourth mirror and the rotation axis May be 90 degrees or more and 270 degrees or less.

  According to this light source device, since the distance between the third mirror and the fourth mirror can be increased, the physical interference between the third mirror and the fourth mirror even when the diameter of the substrate is relatively small. Can be suppressed.

In the light source device, the second combining optical system includes a first mirror, a second mirror, a third mirror, a fourth mirror, a fifth mirror, and a sixth mirror, and the first mirror. Transmits a part of the light emitted from the light source toward the second mirror and reflects the remaining part toward the first phosphor layer, and the first phosphor layer. The first fluorescence emitted from the first mirror is transmitted toward the sixth mirror, and the second mirror transmits a part of the light transmitted through the first mirror toward the third mirror and the remaining mirror. Part of the light is reflected toward the fifth mirror, and the third mirror reflects the excitation light transmitted through the second mirror toward the second phosphor layer and from the second phosphor layer. The emitted second fluorescence is transmitted toward the fourth mirror. The fourth mirror reflects the second fluorescence transmitted through the third mirror toward the fifth mirror, and the fifth mirror reflects the excitation light reflected by the second mirror in the sixth mirror. Reflecting the second fluorescence reflected by the fourth mirror in the same direction as the reflection direction of the excitation light reflected by itself,
The sixth mirror transmits the first fluorescence transmitted through the first mirror and reflects both the excitation light reflected by the fifth mirror and the second fluorescence transmitted through the fifth mirror. Also good.

  According to this light source device, excitation light is incident on the first phosphor layer and the second phosphor layer with a simple configuration in which only six mirrors are provided, and a part of the light emitted from the light source. And the first fluorescence emitted from the first phosphor layer and the second fluorescence emitted from the second phosphor layer can be synthesized.

  In the light source device, the second mirror may be disposed on an optical path of light that travels linearly between the first mirror and the third mirror.

  According to this light source device, the first mirror, the second mirror, and the third mirror are linearly arranged. For this reason, each mirror is disposed at a position overlapping the substrate when viewed from a direction orthogonal to the upper surface of the substrate. That is, the second mirror is not disposed at a position that does not overlap the substrate when viewed from the direction orthogonal to the upper surface of the substrate. Therefore, the apparatus can be reduced in size.

  In the light source device, when viewed from a direction orthogonal to the first main surface of the substrate, the fourth mirror overlaps with the third mirror, the fifth mirror overlaps with the second mirror, and the sixth mirror It may overlap with the first mirror.

  According to this light source device, the fourth mirror, the fifth mirror, and the sixth mirror are linearly arranged. For this reason, each mirror is disposed at a position overlapping the substrate when viewed from a direction orthogonal to the upper surface of the substrate. Therefore, the apparatus can be reduced in size.

  In the light source device, the excitation light may be blue light, the first fluorescence may be red light, and the second fluorescence may be green light.

  According to this light source device, RGB color display using blue light as excitation light can be realized.

  In the light source device, the light source may be a semiconductor element.

  According to this light source device, it is possible to reduce the size of the device and extend the life of the light source.

  In the light source device, the light source may be a semiconductor laser.

  According to this light source device, since light is condensed and irradiated on the phosphor layer, a highly efficient light source can be realized.

  In the light source device, the light intensity of the excitation light incident on the second phosphor layer may be greater than the light intensity of the excitation light incident on the first phosphor layer.

  Since the substrate rotates around the rotation axis, the moving speed of the excitation light beam spot in the second annular region is larger than the moving speed of the excitation light beam spot in the first annular region. Therefore, if the energy density of the excitation light on the second phosphor layer and the energy density of the excitation light on the first phosphor layer are equal to each other, the unit area of the second phosphor layer is irradiated per unit time. The energy of the excitation light is smaller than the energy of the excitation light irradiated per unit time on the unit area of the first phosphor layer. Therefore, according to this light source device, even when it is necessary to irradiate relatively strong excitation light to the second phosphor layer, a light saturation phenomenon occurs in the second phosphor layer or the phosphor becomes high temperature. Can be suppressed, and a decrease in conversion efficiency to fluorescence can be suppressed.

  In the light source device, a first reflecting surface that reflects the first fluorescence emitted from the first phosphor layer is formed between the substrate and the first phosphor layer, and A second reflecting surface that reflects the second fluorescence emitted from the second phosphor layer may be formed between the substrate and the second phosphor layer.

According to this light source device, the light emitted from each phosphor layer is reflected to the side opposite to the substrate.
Therefore, it is possible to efficiently extract light from each phosphor layer.

  The projector according to the present invention includes the light source device described above, a light modulation device that modulates light emitted from the light source device according to image information, and a projection optical system that projects the modulated light from the light modulation device as a projection image. And.

  According to this projector, since the light source device described above is provided, it is possible to provide a projector that can be used for general purposes while reducing the size of the device.

It is a schematic diagram which shows the structure of the light source device which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the light emitting element with which a light source device is provided. It is a schematic diagram which shows the structure of a fluorescent substance layer similarly. It is a schematic diagram which shows the structure of a light diffusing plate equally. It is a figure which shows the arrangement | positioning state of the light guide optical system with respect to a board | substrate. It is a schematic diagram which shows a projector similarly. It is explanatory drawing of a polarization conversion element similarly. It is a schematic diagram which shows the structure of the light source device which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the light source device which concerns on 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. Such an embodiment shows one aspect of the present invention, and is not intended to limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, an actual structure and a scale, a number, and the like in each structure are different.

[First Embodiment]
FIG. 1 is a schematic diagram illustrating a configuration of a light source device 100 according to the present embodiment. As shown in FIG. 1, the light source device 100 includes a light source unit 10, a collimating optical system 20, a light guiding optical system 30, a light emitting element 40, a light diffusing plate 46, a pickup lens 50, a dichroic mirror 60, a combining optical system (first optical system). (Combining optical system) 70. In the light source device 100, the liquid crystal light is emitted from the red phosphor layer (first phosphor layer) 45R included in the light emitting element 40 by irradiating the light emitting element 40 with the blue laser beam B emitted from the light source unit 10. Red fluorescence (first fluorescence) R used as illumination light for the bulb is emitted, and similarly green fluorescence (second fluorescence) G is emitted from the green phosphor layer (second phosphor layer) 45G. Further, the white light L can be emitted by synthesizing these color lights with the laser light which is blue light. In the following description, the red phosphor layer 45R and the green phosphor layer 45G may be collectively referred to as the phosphor layer 45.

  The light source device 100 of this embodiment can be suitably used as illumination light for a projector. Hereinafter, the configuration of the light source device 100 will be described in order.

  The light source unit 10 is a laser light source array that includes a plurality (three in the drawing) of laser light sources (semiconductor lasers) 11 and emits blue (light emission intensity peak: about 445 nm) laser light B as excitation light. . In the light source unit 10, for example, by arranging the laser light sources 11 in a two-dimensional manner, a high output excitation light source can be obtained.

  The light source unit 10 may use only one laser light source instead of the laser light source array. In addition, other solid-state light sources (semiconductor elements) such as LEDs can be used instead of the laser light source. Furthermore, it may be a light source that emits colored light having a peak wavelength other than 445 nm as long as it is light having a wavelength that can excite a fluorescent substance to be described later.

  In the collimating optical system 20, a collimator lens array 21, a condenser lens 23, and a collimating lens 25 are arranged in this order on the optical path. The laser beam B emitted from the light source unit 10 is incident on a small lens of a collimator lens array 21 provided corresponding to the laser light source of the light source unit 10 as one body 1 and is collimated. By passing through the collimating lens 25 after being condensed, the beam bundle as a whole is reduced.

  The light guide optical system 30 includes a first light guide mirror 31, a second light guide mirror (first mirror) 32, and a third light guide mirror (second mirror) 33. Among these, the first light guide mirror 31 and the second light guide mirror 32 are beam splitters that reflect a part of incident light and transmit the remaining part. The third light guide mirror 33 is a reflection mirror that reflects light.

  The first light guide mirror 31 and the second light guide mirror 32 have a configuration in which a light separation film such as a dielectric multilayer film is formed on a transparent substrate. The ratio of the reflected light and the transmitted light of the first light guide mirror 31 and the second light guide mirror 32 to be used can be arbitrarily controlled by controlling the configuration (refractive index, thickness, etc.) of the light separation film.

  The laser beam B emitted from the collimating optical system 20 is incident on the first light guide mirror 31, and a part of the laser beam B is reflected and incident on the light diffusion plate 46 as the first excitation light B1. Further, the remaining part of the laser light transmitted through the first light guide mirror 31 is incident on the second light guide mirror 32, and a part of the laser light is reflected to become the second excitation light B2. The second excitation light B <b> 2 is reflected by the second light guide mirror 32 and enters the green phosphor layer 45 </ b> G provided in the light emitting element 40. The remaining part of the laser light B that passes through the second light guide mirror 32 is reflected by the third light guide mirror 33 and enters the red phosphor layer 45R provided in the light emitting element 40 as the third excitation light B3. . In this way, the laser beam B is divided into three beam bundles of the first excitation beam B1, the second excitation beam B2, and the third excitation beam B3, and the first excitation beam B1 enters the light diffusion plate 46, The second excitation light B2 enters the green phosphor layer 45G, and the third excitation light B3 enters the red phosphor layer 45R. The second excitation light B2 is excitation light that excites the green phosphor layer 45G, and the third excitation light B3 is excitation light that excites the red phosphor layer 45R. The first excitation light B1 is not light that excites the light diffusion plate 46. The first excitation light B1 is diffused by the light diffusing plate 46 and emitted from the light diffusing plate 46 as blue light whose light distribution is changed.

  Further, when the light source device 100 according to the present embodiment is employed as a light source of a projector, the first excitation light B1 is laser light, and thus speckle noise is generated in an image formed by the first excitation light B1. However, speckle noise can be reduced if the position where the first excitation light B1 is incident on the light diffusion plate 46 is changed with time, for example, by rotating the light diffusion plate 46 around a predetermined rotation axis. Can do.

  The light emitting element 40 uses the phosphor layer 45 provided in the light emitting element 40 to convert the second excitation light B2 and the third excitation light B3 into green fluorescence G and red fluorescence R, respectively, and emits them.

  The light emitting element 40 will be described with reference to FIGS. FIG. 2 is a plan view of the light emitting element 40, and FIG. 3 is a partial cross-sectional view of the red phosphor layer 45 </ b> R provided in the light emitting element 40.

  As shown in FIG. 2, the light emitting element 40 includes a circular substrate 41 in plan view, a red phosphor layer 45 </ b> R provided in the first annular region AR <b> 1 on the first main surface 41 a of the substrate 41, And a green phosphor layer 45G provided in the second annular region AR2 on the first main surface 41a. The first annular area AR1 and the second annular area AR2 are set concentrically. The second annular area AR2 is set on the outer peripheral side of the first annular area AR1. The light intensity of the excitation light B2 incident on the green phosphor layer 45G is higher than the light intensity of the excitation light B3 incident on the red phosphor layer 45R.

  The light emitting element 40 has a rotating shaft 48 provided in parallel to a normal passing through the center of the substrate 41 and is connected to a motor 49 so as to be rotatable. The light emitting element 40 is disposed such that the second main surface 41b on which the phosphor layer 45 is not formed faces the light guide optical system 30.

  The substrate 41 includes a substrate body 42, a wavelength selection film 43 provided between the substrate body 42 and the phosphor layer 45, and an antireflection coating provided on the surface of the substrate body 42 opposite to the wavelength selection film 43. And a film 44.

  The substrate body 42 uses a material that transmits blue light, which is excitation light, as a forming material. For example, quartz glass, crystal, sapphire (single crystal corundum), transparent resin, or the like can be used. Among these, quartz glass, quartz, and sapphire, which are inorganic materials, are preferably used so as not to be deformed by heating with excitation light. Further, when the substrate 41 is made to dissipate heat generated when light is emitted from the phosphor layer 45, it is preferable to use quartz as a forming material in consideration of heat transfer and the like.

  The wavelength selection film 43 is a light separation film such as a dielectric multilayer film laminated on the surface of the substrate body 42. The wavelength selection film 43 has wavelength selectivity that selectively transmits colored light in the wavelength band of the excitation light and reflects colored light in other wavelength bands. Specifically, the wavelength selection film 43 transmits blue light (for example, light having a wavelength of about 445 nm) and reflects light having a longer wavelength than blue light (for example, light having a longer wavelength than 480 nm). That is, the wavelength selection film 43 has a reflection surface that reflects the red fluorescence R and the green fluorescence G. As a result, the excitation light that is blue light passes through the wavelength selection film 43 and enters the phosphor layer 45. Further, it is possible to prevent the red fluorescence R and the green fluorescence G generated in the phosphor layer 45 from returning in the direction of the light guide optical system 30 and to be directed in the emission direction (the direction of the synthesis optical system 70).

  As the antireflection film 44, a film composed of a generally known dielectric multilayer film can be used. The refractive index of the plurality of layers constituting the antireflection film 44 is adjusted so as to prevent reflection of the excitation light B. Thereby, the loss of the excitation light in the 2nd main surface 41b can be suppressed.

As shown in FIG. 3, the red phosphor layer 45 </ b> R includes a plurality of phosphor particles 451 </ b> R that emit fluorescence, and a base material 452 having optical transparency. The red phosphor layer 45R is provided on the side of the substrate 41 opposite to the side on which the third excitation light B3 that excites the red phosphor layer 45R is incident.
The third excitation light B3 enters the red phosphor layer 45R, and a part thereof is converted to red fluorescence R.

The phosphor particles 451R are particulate fluorescent materials that absorb the third excitation light B3 and emit red fluorescence R. As such phosphor particles 451R, those having an average particle diameter of about 1 μm to several tens of μm are known to exhibit high luminous efficiency. As the phosphor particles 451R, a commonly known red phosphor can be used. For example, a material such as a phosphor having a composition represented by (Sr, Ca) AlSiN ₃ : Eu having an average particle diameter of 10 μm can be used.

  Note that the phosphor particles 451R may be formed of a single material, or a mixture of particles formed using two or more materials may be used as the phosphor particles 451R.

  Here, the average particle diameter of the phosphor particles 451R can be measured using a particle size distribution measuring apparatus (for example, SALD2200 (manufactured by Shimadzu Corporation)) based on a laser diffraction scattering method. In this embodiment, the median particle size (Median Size: median of particle size distribution) is adopted as the average particle size.

  3 shows the red phosphor layer 45R, but the green phosphor layer 45G shown in FIG. 2 has the same structure by replacing the phosphor particles 451R with phosphor particles emitting green fluorescence. A configuration can be employed. As shown in FIG. 1, the second excitation light B2 is incident on the green phosphor layer 45G, and a part thereof is converted into green fluorescence G.

As such phosphor particles, a generally known green phosphor can be used. For example, a material such as a phosphor having a composition represented by (YGd) ₃ Al ₅ O ₁₂ : Ce having an average particle diameter of 10 μm can be used. The green phosphor may also be a particle formed from one type of forming material, or a mixture of particles formed using two or more types of forming materials.

  The base material 452 functions as a binder for the phosphor particles 451R. As a material for forming the base material 452, a resin material having optical transparency can be used, and among them, a silicone resin having high heat resistance can be preferably used.

FIG. 4 is a partial cross-sectional view illustrating the configuration of the light diffusing plate 46.
First, as illustrated in FIG. 4A, the light diffusion plate 46 </ b> A includes a substrate 460, a filler 461, and a base material 462. The light diffusing plate 46A can employ a configuration in which a filler 461 having a high refractive property such as TiO ₂ is dispersed in a base material 462 having a light transmitting property. As the base material 462, a resin material similar to that of the above-described base material 452 can be used.
Such a light diffusing plate 46A can be formed by applying and curing a precursor of a base material 462 in which a filler 461 is dispersed.

  As shown in FIG. 4A, in such a light diffusing plate 46A, the first excitation light B1 enters the light diffusing plate 46A and is refracted and scattered by the filler 461, thereby changing the light distribution. Emitted as blue light.

  In addition, as shown in FIG. 4B, the light diffusing plate 46 </ b> B can employ a configuration in which a plurality of irregularities are provided on the surface of a light-transmitting base material 463. In FIG. 4B, the surface of the base material 463 is illustrated as being provided with a plurality of recesses 464. Such a light diffusion plate 46B is formed by applying the precursor of the base material 463, curing the base material 463 in a state of being embossed using a convex mold corresponding to the concave portion 464, and removing the convex mold after curing. Can be formed.

  As shown in FIG. 4B, in such a light diffusing plate 46B, the first excitation light B1, which is a laser beam having high straightness, is incident on the light diffusing plate 46B and refracted and scattered by the concave portion 464. Thus, the light is emitted as blue light whose light distribution is changed.

  Further, when the light source device 100 according to the present embodiment is employed as a light source of a projector, the first excitation light B1 is laser light, and thus speckle noise is generated in an image formed by the first excitation light B1. However, speckle noise can be reduced if the position where the first excitation light B1 is incident on the light diffusing plate 46B is changed with time, for example, by rotating the light diffusing plate 46B around a predetermined rotation axis. Can do.

FIG. 5 is a schematic diagram illustrating an arrangement state of the light guide optical system 30 with respect to the substrate 41.
In FIG. 5, CP is the center of rotation of the substrate 41 (center of the rotation axis), CP1 is the center of the second light guide mirror 32, and CP2 is the center of the third light guide mirror 33. Θ is the center CP1 of the second light guide mirror 32 and the center of rotation of the substrate 41 as viewed from the direction orthogonal to the first main surface 41a of the substrate 41, that is, from the direction parallel to the rotation axis of the substrate 41. This is an angle formed by a line connecting CP and a line connecting the center CP2 of the third light guide mirror 33 and the rotation center CP of the substrate 41. In other words, the intersection of the rotation axis of the substrate 41 and the first main surface 41a is CP ′, the projection of the center CP1 of the second light guide mirror 32 onto the first main surface 41a is CP1 ′ (not shown), When the projection of the center CP2 of the third light guide mirror 33 onto the first main surface 41a is CP2 ′ (not shown), θ is a straight line connecting CP ′ and CP1 ′, and CP ′ and CP2 ′. It is the angle formed by the straight line connecting

  As shown in FIG. 5, when viewed from a direction orthogonal to the first main surface 41 a of the substrate 41, a line connecting the center CP <b> 1 of the second light guide mirror 32 and the rotation center CP of the substrate 41 and the third light guide mirror 33. The angle θ formed by the line connecting the center CP2 and the rotation center CP of the substrate 41 is 180 degrees. Thereby, the 2nd light guide mirror 32 and the 3rd light guide mirror 33 are arranged so that it may not contact mutually. Note that θ is not limited to 180 degrees, and may be in the range of 90 degrees to 270 degrees. That is, when the second light guide mirror 32 is fixed at a predetermined position, the center CP2 of the third light guide mirror 33 only needs to be disposed in the semicircular region ARM in a plan view shown by hatching in FIG. . According to this, even when the diameter of the substrate 41 is relatively small, the second light guide mirror 32 and the third light guide mirror 32 are prevented from contacting each other. An optical mirror 33 can be arranged.

  Returning to FIG. 1, the motor 49 rotates the light emitting element 40 at, for example, 7500 rpm when in use. In this case, the region (beam spot) irradiated with the excitation light (second excitation light B2, third excitation light B3) in the light emitting element 40 moves in the circumferential direction. That is, the motor 49 functions as a position displacement unit that displaces the position of the beam spot in the light emitting element 40. Thereby, since excitation light does not continue irradiating the same position on the light emitting element 40, the thermal deterioration of an irradiation position can be prevented and a lifetime of an apparatus can be extended.

  The first excitation light B1 emitted from the light diffusion plate 46, the light emitted from the green phosphor layer 45G, and the light emitted from the red phosphor layer 45R are the light diffusion plate 46, the green phosphor layer 45G, and the red fluorescence. The light enters the pickup lens 50 provided corresponding to the body layer 45R. The pickup lens 50 collimates the light emitted while diffusing from the light diffusion plate 46, the green phosphor layer 45G, and the red phosphor layer 45R.

Light emitted from the green phosphor layer 45G and transmitted through the pickup lens 50 is incident on a dichroic mirror 60 provided corresponding to the green phosphor layer 45G. The light emitted from the red phosphor layer 45R and transmitted through the pickup lens 50 is incident on the dichroic mirror 60 provided corresponding to the red phosphor layer 45R. The dichroic mirror 60 has wavelength selectivity that selectively reflects colored light in the wavelength band of excitation light and transmits colored light in other wavelength bands. Specifically, blue light (for example, light having a wavelength of about 445 nm) is reflected, and light having a longer wavelength than blue light (for example, light having a longer wavelength than 480 nm) is transmitted.
The dichroic mirror 60 has a dielectric multilayer film.

  Here, in the light emitted from the green phosphor layer 45G and the red phosphor layer 45R, excitation light components (second excitation light B2 and third excitation light B3) that have not been converted into fluorescence in each phosphor layer are included. include. However, these excitation light components are separated by the dichroic mirror 60 and reflected toward each phosphor layer.

Thereby, the excitation light, which is blue light, reenters the phosphor layer and is used for fluorescence emission.
Further, light emitted from the green phosphor layer 45G and the red phosphor layer 45R becomes green fluorescence G and red fluorescence R having high color purity, and is emitted in the direction of the synthesis optical system 70.

  The combining optical system 70 includes a first combining mirror (third mirror) 71, a second combining mirror (fourth mirror) 72, and a third combining mirror 73. Among these, the 1st synthetic | combination mirror 71 is a reflective mirror which reflects light. The second composite mirror 72 is a dichroic mirror that transmits red light and reflects green light. Furthermore, the third composite mirror 73 is a dichroic mirror that transmits blue light and reflects light having a longer wavelength than blue light (for example, light having a longer wavelength than 480 nm). The second composite mirror 72 and the third composite mirror 73 have a configuration in which a light separation film such as a dielectric multilayer film is formed on a transparent substrate.

  The red fluorescence R emitted from the light emitting element 40 is reflected by the first synthesis mirror 71, passes through the second synthesis mirror 72, is reflected by the third synthesis mirror 73, and is emitted to the outside. Further, the green fluorescence G emitted from the light emitting element 40 is reflected by the second synthesis mirror 72, then reflected by the third synthesis mirror 73, and emitted outside. And the 1st excitation light B1 inject | emitted from the light diffusing plate 46 permeate | transmits the 3rd synthetic | combination mirror 73, and inject | emits outside.

In this way, the red fluorescence R, the green fluorescence G, and the first excitation light B1 are combined and emitted as white light L.
The light source device 100 of this embodiment functions as described above.

  FIG. 6 is a schematic diagram showing the projector PJ of this embodiment. As shown in FIG. 6, the projector PJ includes a light source device 100, a color separation optical system 200, liquid crystal light valves (light modulation elements) 400R, 400G, and 400B, a color composition element 500, and a projection optical system 600.

The projector PJ generally operates as follows. The light emitted from the light source device 100 is separated into a plurality of color lights by the color separation optical system 200. The plurality of color lights separated by the color separation optical system 200 are incident on the corresponding liquid crystal light valves 400R, 400G, and 400B and modulated. A plurality of color lights modulated by the liquid crystal light valves 400R, 400G, and 400B are incident on the color synthesis element 500 and synthesized. The light synthesized by the color synthesizing element 500 is enlarged and projected by a projection optical system 600 onto a screen SCR such as a wall or a screen, and a full-color projection image is displayed.
Hereinafter, each component of the projector PJ will be described.

  The collimating optical system 110 includes a first lens 112 that suppresses the spread of light emitted from the light source device 100 and a second lens 114 that substantially collimates light incident from the first lens 112, and as a whole, the light source device. The light emitted from 100 is collimated. In the present embodiment, the first lens 112 and the second lens 114 are configured as convex lenses.

  The lens arrays 120 and 130 make the luminance distribution of the light emitted from the collimating optical system 110 uniform. The lens array 120 includes a plurality of first small lenses 122, and the lens array 130 includes a plurality of second small lenses 132. The first small lens 122 has a one-to-one correspondence with the second small lens 132. Light emitted from the collimating optical system 110 is spatially divided and incident on the plurality of first small lenses 122. The first small lens 122 causes the incident light to form an image on the corresponding second small lens 132. Thereby, a secondary light source image is formed on each of the plurality of second small lenses 132. The outer shapes of the first small lens 122 and the second small lens 132 are substantially similar to the outer shapes of the image forming areas of the liquid crystal light valves 400R, 400G, and 400B.

The polarization conversion element 140 aligns the polarization state of the light L emitted from the lens arrays 120 and 130. As shown in FIG. 7, the polarization conversion element 140 includes a plurality of polarization conversion cells 141. The polarization conversion cell 141 has a one-to-one correspondence with the second small lens 132.
The light L from the secondary light source image formed on the second small lens 132 enters the incident region 142 of the polarization conversion cell 141 corresponding to the second small lens 132.

  Each polarization conversion cell 141 is provided with a polarization beam splitter film 143 (hereinafter referred to as a PBS film 143) and a phase difference plate 145 corresponding to the incident region 142. The light L incident on the incident region 142 is separated by the PBS film 143 into P-polarized light L1 and S-polarized light L2 with respect to the PBS film 143. One of the P-polarized light L1 and the S-polarized light L2 (here, S-polarized light L2) is reflected by the reflecting member 144 and then enters the phase difference plate 145. The S-polarized light L2 incident on the phase difference plate 145 is converted into the polarization state of the other polarization (here, P-polarized light L1) by the phase difference plate 145 to become the P-polarized light L3, and is emitted together with the P-polarized light L1. .

  The superimposing lens 150 superimposes the light emitted from the polarization conversion element 140 in the illuminated area. The light emitted from the light source device 100 is spatially divided and then superimposed, whereby the luminance distribution is made uniform and the axial symmetry around the light axis 100ax is enhanced.

  The color separation optical system 200 includes a dichroic mirror 210, a dichroic mirror 220, a mirror 230, a mirror 240, a mirror 250, a field lens 300R, a field lens 300G, a field lens 300B, a relay lens 260, and a relay lens 270. The dichroic mirror 210 and the dichroic mirror 220 are obtained by, for example, laminating a dielectric multilayer film on a glass surface. The dichroic mirror 210 and the dichroic mirror 220 have a characteristic of selectively reflecting color light in a predetermined wavelength band and transmitting color light in other wavelength bands. Here, the dichroic mirror 210 reflects green light and blue light, and the dichroic mirror 220 reflects green light.

  The light L emitted from the light source device 100 enters the dichroic mirror 210. The red light R of the light L enters the mirror 230 through the dichroic mirror 210, is reflected by the mirror 230, and enters the field lens 300R. The red light R is collimated by the field lens 300R and then enters the liquid crystal light valve 400R.

  Green light G and blue light B in the light L are reflected by the dichroic mirror 210 and enter the dichroic mirror 220. The green light G is reflected by the dichroic mirror 220 and enters the field lens 300G. The green light G is collimated by the field lens 300G and then enters the liquid crystal light valve 400G.

  The blue light B that has passed through the dichroic mirror 220 passes through the relay lens 260 and is reflected by the mirror 240, then passes through the relay lens 270, is reflected by the mirror 250, and enters the field lens 300B. The blue light B is collimated by the field lens 300B and then enters the liquid crystal light valve 400B.

  The liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B are configured by a light modulation device such as a transmissive liquid crystal light valve. The liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B are electrically connected to a signal source (not shown) such as a PC that supplies an image signal including image information. The liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B modulate the incident light for each pixel based on the supplied image signal to form an image. The liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B form a red image, a green image, and a blue image, respectively. The light (formed image) modulated by the liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B enters the color composition element 500.

The color composition element 500 is configured by a dichroic prism or the like. The dichroic prism has a structure in which four triangular prisms are bonded to each other. The surface to be bonded in the triangular prism becomes the inner surface of the dichroic prism. On the inner surface of the dichroic prism, a mirror surface that reflects red light and transmits green light and a mirror surface that reflects blue light and transmits green light are formed orthogonal to each other. The green light incident on the dichroic prism is emitted as it is through the mirror surface. The red light and blue light incident on the dichroic prism are selectively reflected or transmitted by the mirror surface and emitted in the same direction as the emission direction of the green light. In this way, the three color lights (images) are superimposed and combined, and the combined color light is enlarged and projected onto the screen SCR by the projection optical system 600.
The projector PJ of this embodiment has the above configuration.

  According to the light source device 100 having the above-described configuration, the red phosphor layer 45R and the green phosphor layer 45G are integrated on the same substrate 41, so that it is easy to reduce the size of the device. The red phosphor layer 45R and the green phosphor layer 45G are provided concentrically around the rotation axis 48 of the substrate 41. For this reason, even if the irradiation position of light changes due to the rotation of the substrate 41, the red phosphor layer 45R and the green phosphor layer 45G are continuously irradiated with light. Therefore, a plurality of color lights can be extracted at the same time, and can be used for general purposes.

  Further, according to this configuration, a transmission type configuration can be realized. Excitation light is incident on the red phosphor layer 45R and the green phosphor layer 45G via the substrate 41. For this reason, compared with the structure which excitation light injects into a fluorescent substance layer directly, it can suppress that a fluorescent substance becomes high temperature and can suppress the fall of the conversion efficiency to fluorescence.

  In addition, according to this configuration, since the light guide optical system 30 is provided, a light source that emits excitation light incident on the red phosphor layer 45R and a light source that emits excitation light incident on the green phosphor layer 45G are individually provided. There is no need to provide it. That is, excitation light can be incident on the red phosphor layer 45R and the green phosphor layer 45G with a simple configuration in which only one light source unit 10 is provided.

  Further, according to this configuration, excitation light can be incident on the red phosphor layer 45R and the green phosphor layer 45G with a simple configuration in which only the two mirrors 32 and 33 are provided.

  Further, according to this configuration, θ is 90 degrees or more and 270 degrees or less, so that the distance between the second light guide mirror 32 and the third light guide mirror 33 can be increased. Therefore, even if the diameter of the substrate 41 is relatively small, physical interference between the second light guide mirror 32 and the third light guide mirror 33 can be suppressed.

  Further, according to this configuration, since the synthesis optical system 70 is provided, the configuration of the optical system is simplified compared to the case where the first fluorescence and the second fluorescence are separately guided toward the illumination target region. Can be

  Further, according to this configuration, the red fluorescence R emitted from the red phosphor layer 45R and the green fluorescence G emitted from the green phosphor layer 45G can be obtained with a simple configuration in which only two mirrors 71 and 72 are provided. Can be synthesized.

  Further, according to this configuration, since the excitation light is blue light, the first light is red light, and the second light is green light, an RGB color display using blue light as excitation light is realized. be able to.

  In addition, according to this configuration, when a semiconductor element is used as the light source 11, it is possible to reduce the size of the apparatus and extend the life of the light source.

  Further, according to this configuration, since a semiconductor laser is used as the light source 11, light is condensed and irradiated on the phosphor layer, so that a highly efficient light source can be realized.

  Since the substrate 41 rotates around the rotation axis, the moving speed of the excitation light beam spot in the second annular area AR2 is larger than the moving speed of the excitation light beam spot in the first annular area AR1. Therefore, if the energy density of the second excitation light B2 on the green phosphor layer 45G is equal to the energy density of the third excitation light B3 on the red phosphor layer 45R, the unit area of the green phosphor layer 45G is reached. The energy of the second excitation light B2 irradiated per unit time is smaller than the energy of the third excitation light B3 irradiated per unit time to the unit area of the red phosphor layer 45R. Therefore, even when it is necessary to irradiate the green phosphor layer 45G with relatively strong excitation light, it is possible to suppress the occurrence of a light saturation phenomenon or a high temperature of the phosphor in the green phosphor layer 45G. A reduction in conversion efficiency can be suppressed. In the present embodiment, the red phosphor layer 45R is provided in the first annular region AR1, and the green phosphor layer 45G is provided in the second annular region AR2, but the red phosphor layer 45R is irradiated with relatively strong excitation light. If necessary, the green phosphor layer 45G may be provided in the first annular region AR1, and the red phosphor layer 45R may be provided in the second annular region AR2.

  In addition, according to this configuration, since the wavelength selection film 43 is provided between the substrate 41 and the phosphor layer 45, light emitted from the red phosphor layer 45 </ b> R and the green phosphor layer 45 </ b> G is emitted from the substrate 41. Is reflected to the opposite side. Therefore, light from the red phosphor layer 45R and the green phosphor layer 45G can be efficiently extracted.

  Further, according to the projector PJ having the above-described configuration, the apparatus can be reduced in size and the image formation is performed using the light source device 100 that emits white light without interruption, so that high-quality image display is possible. Become.

  In the present embodiment, the wavelength selection film 43 is provided on the entire surface of the substrate body 42. However, the first annular region AR1 in which the red phosphor layer 45R is provided and the green phosphor layer 45G are provided. As long as it is provided in the second annular area AR2 provided, it may not be in another area.

[Second Embodiment]
FIG. 8 is a schematic diagram showing the configuration of the light source device 101 according to the second embodiment of the present invention.
The light source device 101 of this embodiment is partly in common with the light source device 100 of the first embodiment.
Therefore, in this embodiment, the same code | symbol is attached | subjected about the component which is common in 1st Embodiment, and detailed description is abbreviate | omitted.

  As shown in FIG. 8, the light source device 101 includes a light source unit 10, a collimating optical system 20, a light emitting element 40A, a light diffusing plate 46, a pickup lens 50, a pickup lens 51, and a combining optical system (second combining optical system) 70A. Have.

  In the light source device 101 of the present embodiment, the light emitting element 40A differs from the light source device 100 of the first embodiment described above, and fluorescence is emitted from the side where the excitation light enters the light emitting element 40A and from the light emitting element 40A. The side has the same so-called reflection type configuration. The laser beam B emitted from the light source unit 10 and transmitted through the collimating optical system 20 to reduce the light flux is converted into a green phosphor layer 45G and a red phosphor layer provided in the light emitting element 40A through the synthetic optical system 70A. It is incident on 45R.

  The combining optical system 70A includes a first mirror 71A, a second mirror 72A, a first reflecting mirror 73A, a second reflecting mirror 74A, a third mirror 75A, and a fourth mirror 76A.

  First, the laser light B emitted from the light source unit 10 is supplied to the first excitation light B1, the second excitation light B2, and the third light by the first mirror 71A, the second mirror 72A, and the first reflection mirror 73A included in the combining optical system 70A. The light is incident on the light emitting element 40A while being separated into the excitation light B3.

  The first mirror 71A is a beam splitter that reflects a part of the incident laser light B, transmits the remaining part, and further transmits green light. The second mirror 72A is a beam splitter that reflects a part of the incident laser light B, transmits the remaining part, and transmits red light. The first reflection mirror 73A is a reflection mirror that reflects light. The first mirror 71A and the second mirror 72A have a configuration in which a light separation film such as a dielectric multilayer film is formed on a transparent substrate.

  The red fluorescence R and the green fluorescence G emitted from the light emitting element 40A and the first excitation light B1 reflected by the first reflection mirror 73A are the second reflection mirror 74A and the third reflection light that the synthesis optical system 70A has. The light is synthesized by the mirror 75A and the fourth mirror 76A and emitted as white light L to the outside.

  Specifically, the second reflection mirror 74A is a reflection mirror that reflects light. The third mirror 75A is a dichroic mirror that transmits blue light and reflects red light. Further, the fourth mirror 76A is a dichroic mirror that transmits green light and reflects red light and blue light. The third mirror 75A and the fourth mirror 76A have a configuration in which a light separation film such as a dielectric multilayer film is formed on a transparent substrate.

  As shown in FIG. 8, in the light emitting element 40A of the present embodiment, a red phosphor layer 45R and a green phosphor layer 45G similar to those of the first embodiment are provided concentrically on the first main surface 41Aa of the substrate 41A. ing. The light emitting element 40A included in the light source device 101 of the present embodiment is different from the light source device of the first embodiment described above, on the side where excitation light is incident on the light emitting element 40A and on the side where fluorescence is emitted from the light emitting element 40A. Have the same so-called reflective configuration.

  The substrate 41A has a reflecting surface that reflects blue light that is excitation light and red light and green light that are fluorescence. As a forming material of the substrate 41A, for example, a light-transmitting forming plate material such as a metal substrate such as an aluminum substrate, quartz glass, crystal, sapphire (single crystal corundum), transparent resin or the like can be used. What formed the reflecting film in the surface of the board | plate material of the forming material which has can be used. It is assumed that the substrate 41A of this embodiment is formed using an aluminum substrate.

  When excitation light is incident on the red phosphor layer 45R and the green phosphor layer 45G provided on the substrate 41A, the fluorescence emitted from each phosphor layer is reflected by the substrate 41A, and the excitation light is incident. Injected in the direction.

  Similarly to the first embodiment, as viewed from a direction orthogonal to the first main surface 41Aa of the substrate 41A, a line connecting the center of the first mirror 71A and the rotation center of the substrate 41A and the center of the second mirror 72A The angle formed by the line connecting the rotation center of the substrate 41A is 180 degrees. Accordingly, the first mirror 71A and the second mirror 72A are arranged so as not to contact each other. The angle formed is not limited to 180 degrees, and may be in the range of 90 degrees to 270 degrees. According to this, even when the diameter of the substrate 41A is relatively small, the first mirror 71A and the second mirror 72A are arranged so that the first mirror 71A and the second mirror 72A do not contact each other. Can do.

  Further, as viewed from a direction orthogonal to the first main surface 41Aa of the substrate 41A, a line connecting the center of the third mirror 75A and the rotation center of the substrate 41A, and the center of the fourth mirror 76A and the rotation center of the substrate 41A are connected. The angle made with the line is 180 degrees. Thus, the third mirror 75A and the fourth mirror 76A are arranged so as not to contact each other. The angle formed is not limited to 180 degrees, and may be in the range of 90 degrees to 270 degrees. According to this, even when the diameter of the substrate 41A is relatively small, the third mirror 75A and the fourth mirror 76A are arranged so that the third mirror 75A and the fourth mirror 76A do not contact each other. Can do.

  In the light source device 101 having such a configuration, excitation light and fluorescence are emitted to the outside while exhibiting the following light behavior.

  First, the laser beam B incident on the first mirror 71A is partially reflected to the pickup lens 51 provided facing the green phosphor layer 45G provided on the light emitting element 40A as the second excitation light B2. Incident. The pickup lens 51 condenses the second excitation light B2 on the green phosphor layer 45G. In the green phosphor layer 45G, the phosphor is excited by the second excitation light B2 and emits green fluorescence G. The pickup lens 51 condenses the fluorescence emitted from the green phosphor layer 45G (pickup) and makes it parallel.

  The remaining part of the excitation light transmitted through the first mirror 71A is incident on the second mirror 72A, a part of which is transmitted to become the first excitation light B1, and the remaining part is reflected to become the third excitation light B3.

  The third excitation light B3 is reflected by the second mirror 72A and enters the pickup lens 51 provided facing the red phosphor layer 45R provided in the light emitting element 40A. The pickup lens 51 condenses the third excitation light B3 on the red phosphor layer 45R. In the red phosphor layer 45R, the phosphor is excited by the third excitation light B3 and emits red fluorescence R. The pickup lens 51 collects the fluorescence emitted from the red phosphor layer 45R (pickup) and makes it parallel.

  The first excitation light B1 passes through the second mirror 72A, is reflected by the first reflection mirror 73A, and enters the light diffusion plate 46. The first excitation light B <b> 1 diffused in the light diffusing plate 46 is incident on a pickup lens 50 provided facing the light diffusing plate 46. The pickup lens 50 collimates the light emitted while diffusing from the light diffusion plate 46.

  The green fluorescence G emitted from the green phosphor layer 45G passes through the first mirror 71A and the fourth mirror 76A and is emitted to the outside.

  The red fluorescence R emitted from the red phosphor layer 45R passes through the second mirror 72A, is reflected by the third mirror 75A, is reflected by the fourth mirror 76A, and is emitted to the outside.

  Then, the first excitation light B1 emitted from the light diffusion plate 46 is reflected by the second reflection mirror 74A arranged in the emission direction of the first excitation light B1, passes through the third mirror 75A, and then the fourth mirror. Reflected by 76A and emitted to the outside.

In this way, the red fluorescence R, the green fluorescence G, and the first excitation light B1 are combined and emitted as white light L.
The light source device 101 of this embodiment functions as described above.

  According to the light source device 101 configured as described above, a reflective configuration can be realized.

  Further, according to this configuration, the excitation light is incident on the red phosphor layer 45R and the green phosphor layer 45G with a simple configuration in which only one light source unit 10 is provided. And the red fluorescence R emitted from the red phosphor layer 45R and the green fluorescence G emitted from the green phosphor layer 45G can be synthesized.

  Further, according to this configuration, it is simple to provide only six mirrors (first mirror 71A, second mirror 72A, first reflection mirror 73A, second reflection mirror 74A, third mirror 75A, and fourth mirror 76A). In the configuration, the excitation light is incident on the red phosphor layer 45R and the green phosphor layer 45G, and part of the light emitted from the light source and the red fluorescence R and the green phosphor layer emitted from the red phosphor layer 45R. The green fluorescence G emitted from 45G can be synthesized.

  Further, according to this configuration, as viewed from a direction orthogonal to the first main surface 41Aa of the substrate 41A, a line connecting the center of the first mirror 71A and the rotation center of the substrate 41A, the center of the second mirror 72A, and the substrate 41A Since the angle formed by the line connecting with the rotation center is 90 degrees or more and 270 degrees or less, the distance between the first mirror 71A and the second mirror 72A can be increased. Therefore, even when the diameter of the substrate 41A is relatively small, physical interference between the first mirror 71A and the second mirror 72A can be suppressed.

  Further, according to this configuration, as viewed from the direction orthogonal to the first main surface 41Aa of the substrate 41A, a line connecting the center of the third mirror 75A and the rotation center of the substrate 41A, the center of the fourth mirror 76A, and the substrate 41A Since the angle formed by the line connecting with the rotation center is 90 degrees or more and 270 degrees or less, the distance between the third mirror 75A and the sixth mirror 75A can be increased. Therefore, even when the diameter of the substrate 41A is relatively small, physical interference between the third mirror 75A and the fourth mirror 76A can be suppressed.

  In the present embodiment, the combining optical system 70A (second combining optical system) separates the light emitted from the light source unit 10 into the first excitation light B1, the second excitation light B2, and the third excitation light B3. In addition, the red fluorescence R, the green fluorescence G, and the first excitation light B1 are combined, but the present invention is not limited to this. For example, the second synthesis optical system is configured to separate the light emitted from the light source unit 10 into the second excitation light B2 and the third excitation light B3 and synthesize the red fluorescence R and the green fluorescence G. May be. That is, the combining optical system 70 </ b> A only needs to be configured to separate at least part of the light emitted from the light source unit 10.

  Further, the second synthesis optical system is configured to separate the light emitted from the light source unit 10 into the second excitation light B2 and the third excitation light B3, and to synthesize the red fluorescence R and the green fluorescence G. When it is, the 1st reflective mirror and the 2nd reflective mirror are unnecessary.

[Third Embodiment]
FIG. 9 is a schematic diagram showing a configuration of a light source device 102 according to the third embodiment of the present invention.
The light source device 102 of this embodiment is partly in common with the light source device 101 of the second embodiment.
Therefore, in this embodiment, the same code | symbol is attached | subjected about the component which is common in 2nd Embodiment, and detailed description is abbreviate | omitted.

  As shown in FIG. 9, the light source device 102 includes a light source unit 10, a collimating optical system 20, a light emitting element 40A, a light diffusion plate 46, a pickup lens 50, a pickup lens 51, and a combining optical system (second combining optical system) 70B. Have.

  Unlike the light source device 101 of the second embodiment, the light source device 102 of the present embodiment differs from the light source device 101 of the second embodiment described above in a position overlapping the substrate 41A when viewed from the direction orthogonal to the first main surface 41Aa of the substrate 41A. It has an arranged configuration. The laser beam B emitted from the light source unit 10 and transmitted through the collimating optical system 20 to reduce the light flux is converted into a green phosphor layer 45G and a red phosphor layer provided in the light emitting element 40A via the synthesis optical system 70B. It is incident on 45R.

  The combining optical system 70B includes a first mirror 71B, a second mirror 72B, a third mirror 73B, a fourth mirror 74B, a fifth mirror 75B, and a sixth mirror 76B.

  First, the laser light B emitted from the light source unit 10 is supplied with the first excitation light B1, the second excitation light B2, and the third excitation by the first mirror 71B, the second mirror 72B, and the third mirror 73B included in the synthesis optical system 70B. The light is incident on the light emitting element 40A while being separated into the light B3. That is, the first mirror 71B, the second mirror 72B, and the third mirror 73B have the same function as the light guide optical system 30 of the first embodiment.

  The first mirror 71B is a beam splitter that reflects part of incident excitation light, transmits the remaining part, and further transmits green light. The second mirror 72B is a beam splitter that reflects a part of the incident laser beam B and transmits the remaining part. The third mirror 73B is a beam splitter that reflects the incident laser beam B and transmits the red light. The first mirror 71B, the second mirror 72B, and the third mirror 73B have a configuration in which a light separation film such as a dielectric multilayer film is formed on a transparent substrate.

  The second mirror 72B is disposed on the optical path of light that travels linearly between the first mirror 71B and the third mirror 73B.

  The first excitation light B1 emitted from the light emitting element 40A and reflected by the red fluorescence R, the green fluorescence G, and the third mirror 73B is the fourth mirror 74B, the fifth mirror 75B, the first mirror 75B, and the third mirror 73B. It is synthesized by the six mirrors 76B and emitted as white light L to the outside.

  When viewed from the direction orthogonal to the first main surface 41a of the substrate 41, the fourth mirror 74B overlaps with the third mirror 73B, the fifth mirror 75B overlaps with the second mirror 72B, and the sixth mirror 76B overlaps with the first mirror 71B. They are arranged so as to overlap.

Specifically, the fourth mirror 74B is a reflection mirror that reflects light. The fifth mirror 75B is a dichroic mirror that transmits red light and reflects blue light.
Further, the sixth mirror 76B is a dichroic mirror that transmits green light and reflects red light and blue light. The fifth mirror 75B and the sixth mirror 76B have a configuration in which a light separation film such as a dielectric multilayer film is formed on a transparent substrate.

  In the light source device 102 having such a configuration, excitation light and fluorescence are emitted to the outside while exhibiting the following light behavior.

  First, a part of the laser beam B incident on the first mirror 71B is reflected by the first mirror 71B and provided as the second excitation light B2 facing the green phosphor layer 45G provided in the light emitting element 40A. Is incident on the pickup lens 51. The pickup lens 51 condenses the second excitation light B2 on the green phosphor layer 45G. In the green phosphor layer 45G, the phosphor is excited by the second excitation light B2 and emits green fluorescence G. The pickup lens 51 condenses the fluorescence emitted from the green phosphor layer 45G (pickup) and makes it parallel.

  The remaining part of the excitation light transmitted through the first mirror 71B is separated into the third excitation light B3 and the first excitation light B1 by the second mirror 72B.

  The first excitation light B1 is reflected by the second mirror 72B and enters the light diffusion plate 46. The first excitation light B <b> 1 diffused in the light diffusing plate 46 is incident on a pickup lens 50 provided facing the light diffusing plate 46. The pickup lens 50 collimates the light emitted while diffusing from the light diffusion plate 46.

  The third excitation light B3 is reflected by the third mirror 73B and enters the pickup lens 51 provided facing the red phosphor layer 45R provided in the light emitting element 40A. The pickup lens 51 condenses the third excitation light B3 on the red phosphor layer 45R. In the red phosphor layer 45R, the phosphor is excited by the third excitation light B3 and emits red fluorescence R. The pickup lens 51 collects the fluorescence emitted from the red phosphor layer 45R (pickup) and makes it parallel.

  The green fluorescence G emitted from the green phosphor layer 45G passes through the first mirror 71B and the sixth mirror 76B and is emitted to the outside.

  The first excitation light B1 emitted from the light diffusing plate 46 is reflected by the fifth mirror 75B arranged in the emission direction of the first excitation light B1, and then reflected by the sixth mirror 76B to the outside. It is injected.

  The red fluorescence R emitted from the red phosphor layer 45R is transmitted through the third mirror 73B, reflected by the fourth mirror 74B, transmitted through the fifth mirror 75B, and then reflected by the sixth mirror 76B. It is injected outside.

In this way, the red fluorescence R, the green fluorescence G, and the first excitation light B1 are combined and emitted as white light L.
The light source device 102 of this embodiment functions as described above.

  According to the light source device 102 having the above-described configuration, the red phosphor layer 45R can be simply configured by simply providing six mirrors (mirror 71B, mirror 72B, mirror 73B, mirror 74B, mirror 75B, mirror 76B). Excitation light is incident on the green phosphor layer 45G, and part of the light emitted from the light source, red fluorescence R emitted from the red phosphor layer 45R, and green fluorescence G emitted from the green phosphor layer 45G Can be synthesized.

  Further, according to this configuration, the first mirror 71B, the second mirror 72B, and the third mirror 73B are linearly arranged. For this reason, the mirror 71B, the mirror 72B, and the mirror 73B are arranged at a position overlapping the substrate 41A when viewed from the direction orthogonal to the first main surface 41Aa of the substrate 41A. That is, when viewed from the direction orthogonal to the first main surface 41Aa of the substrate 41A, the second mirror 72B is not disposed at a position that does not overlap the substrate 41A. Therefore, the apparatus can be reduced in size.

  Further, according to this configuration, the fourth mirror 74B, the fifth mirror 75B, and the sixth mirror 76B are linearly arranged. For this reason, the mirror 74B, the mirror 75B, and the mirror 76B are disposed at a position overlapping the substrate 41A when viewed from the direction orthogonal to the first main surface 41Aa of the substrate 41A. Therefore, the apparatus can be reduced in size.

  The present invention is applicable not only when applied to a front projection type projector that projects from the side that observes the projected image, but also when applied to a rear projection type projector that projects from the side opposite to the side that observes the projected image. can do.

  In each of the above embodiments, the example in which the light source device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the light source device of the present invention can be applied to other optical devices (for example, an optical disc device, a car headlamp, a lighting device, etc.).

DESCRIPTION OF SYMBOLS 11 ... Laser light source (light source), 30 ... Light guide optical system, 32 ... 2nd light guide mirror (1st mirror)
, 33 ... third light guide mirror (second mirror), 41 ... substrate, 45 ... phosphor layer, 45R ... red phosphor layer (first phosphor layer), 45G ... green phosphor layer (second fluorescence) Body layer), 48 ... rotation axis,
70: Synthetic optical system (first synthetic optical system), 70A: Synthetic optical system (second synthetic optical system), 70B
... Synthetic optical system (second synthetic optical system), 71 ... First synthetic mirror (third mirror), 71A, 71
B ... 1st mirror, 72 ... 2nd synthetic | combination mirror (3rd mirror), 72A, 72B ... 2nd mirror,
75A, 73B ... third mirror, 76A, 74B ... fourth mirror, 75A, 75B ... fifth mirror, 76A, 76B ... sixth mirror, 100, 101, 102 ... light source device, AR1 ... first annular region, AR2 ... second annular region, CP1 ... center of first mirror, CP2 ... center of second mirror, θ ... angle formed, 400R, 400G, 400B ... liquid crystal light valve (light modulation device),
600: Projection optical system, PJ: Projector

In order to solve the above problems, a light source device according to an aspect of the present invention includes a substrate that can rotate around a predetermined rotation axis, a first phosphor layer provided on a first main surface of the substrate, A second phosphor layer; and a light source that emits excitation light for exciting the first phosphor layer and excitation light for exciting the second phosphor layer, the first phosphor layer comprising: The second phosphor layer is provided in a second annular region on the outer peripheral side of the first annular region, and is provided in the first annular region around the rotation axis of the substrate. The substrate emits first fluorescence emitted from the phosphor layer and second fluorescence emitted from the second phosphor layer, and the substrate emits excitation light for exciting the first phosphor layer and the first fluorescence. The first phosphor is made of a material that transmits both of the excitation light that excites the two phosphor layers and is emitted from the light source. A light guide optical system that divides excitation light for exciting the light and excitation light for exciting the second phosphor layer, and the light guide optical system includes a first mirror and a second mirror, The first mirror transmits a part of the light emitted from the light source toward the second mirror and reflects the remaining part toward the first phosphor layer, and the second mirror The light transmitted through the first mirror is reflected toward the second phosphor layer, and the center of the first mirror and the rotation axis are connected when viewed from a direction orthogonal to the first main surface of the substrate. An angle formed by a line and a line connecting the center of the second mirror and the rotation axis is 90 degrees or more and 270 degrees or less.
In order to solve the above problems, a light source device according to an aspect of the present invention includes a substrate that can rotate around a predetermined rotation axis, a first phosphor layer provided on a first main surface of the substrate, A second phosphor layer; and a light source that emits excitation light for exciting the first phosphor layer and excitation light for exciting the second phosphor layer, the first phosphor layer comprising: The second phosphor layer is provided in a second annular region on the outer peripheral side of the first annular region, and is provided in the first annular region around the rotation axis of the substrate. The first fluorescence emitted from the phosphor layer and the second fluorescence emitted from the second phosphor layer are emitted, and the substrate emits the first fluorescence emitted from the first phosphor layer. The first phosphor layer has a reflection surface that reflects both the fluorescence of the second phosphor and the second fluorescence emitted from the second phosphor layer. The second phosphor layer is provided on the same side as the side on which the excitation light for exciting the first phosphor layer of the substrate is incident, and the second phosphor layer excites the second phosphor layer of the substrate. The excitation light for exciting the first phosphor layer and the excitation light for exciting the second phosphor layer are separated from the light emitted from the light source. And a part of the light emitted from the light source, the first fluorescence emitted from the first phosphor layer, and the second fluorescence emitted from the second phosphor layer. And a second combining optical system, and the second combining optical system includes a first mirror, a second mirror, a third mirror, and a fourth mirror, and the first mirror includes: A part of the light emitted from the light source is transmitted toward the second mirror and the remaining part is transmitted to the first fluorescent light. Reflecting toward the body layer and transmitting the first fluorescence emitted from the first phosphor layer toward the fourth mirror, and the second mirror transmitted through the first mirror The light is reflected toward the second phosphor layer and the second fluorescence emitted from the second phosphor layer is transmitted toward the third mirror, and the third mirror The second fluorescence transmitted through the two mirrors is reflected toward the fourth mirror, and the fourth mirror transmits the first fluorescence transmitted through the first mirror and is reflected by the third mirror. 2 is reflected, and the line connecting the center of the first mirror and the rotation axis and the center of the second mirror and the rotation axis are viewed from a direction orthogonal to the first main surface of the substrate. The angle formed with the line is 90 degrees or more and 270 degrees or less. It is characterized by that.
In order to solve the above-described problems, a light source device of the present invention includes a substrate that can rotate around a predetermined rotation axis, a first phosphor layer provided on a first main surface of the substrate, and a second fluorescence. A light source that emits excitation light that excites the first phosphor layer and excitation light that excites the second phosphor layer, and the first phosphor layer is formed on the substrate. Provided in a first annular region around the rotation axis, and the second phosphor layer is provided in a second annular region on the outer periphery side of the first annular region, from the first phosphor layer The first fluorescence emitted and the second fluorescence emitted from the second phosphor layer are emitted.

Claims (21)

A substrate rotatable around a predetermined rotation axis;
A first phosphor layer and a second phosphor layer provided on the first main surface of the substrate;
A light source that emits excitation light for exciting the first phosphor layer and excitation light for exciting the second phosphor layer;
With
The first phosphor layer is provided in a first annular region around a rotation axis of the substrate;
The second phosphor layer is provided in a second annular region on the outer peripheral side of the first annular region,
A light source device that emits first fluorescence emitted from the first phosphor layer and second fluorescence emitted from the second phosphor layer.   2. The light source device according to claim 1, wherein the substrate is made of a material that transmits both excitation light for exciting the first phosphor layer and excitation light for exciting the second phosphor layer. .   A light guide optical system is provided that divides excitation light for exciting the first phosphor layer and excitation light for exciting the second phosphor layer from light emitted from the light source. The light source device according to claim 2. The light guide optical system includes a first mirror and a second mirror,
The first mirror transmits a part of the light emitted from the light source toward the second mirror and reflects the remaining part toward the first phosphor layer,
The second mirror reflects the light transmitted through the first mirror toward the second phosphor layer;
The angle formed by a line connecting the center of the first mirror and the rotation axis and a line connecting the center of the second mirror and the rotation axis when viewed from a direction orthogonal to the first main surface of the substrate is 90. The light source device according to claim 3, wherein the light source device has a degree of 270 degrees or more and 270 degrees or less.   A first combining optical system for combining the first fluorescence emitted from the first phosphor layer and the second fluorescence emitted from the second phosphor layer; The light source device according to claim 2, wherein the light source device is a light source device. The first combining optical system includes a third mirror and a fourth mirror,
The third mirror reflects the second fluorescence emitted from the second phosphor layer toward the fourth mirror;
The light source device according to claim 5, wherein the fourth mirror reflects the first fluorescence and transmits the second fluorescence reflected by the third mirror. The substrate has a reflecting surface that reflects both the first fluorescence emitted from the first phosphor layer and the second fluorescence emitted from the second phosphor layer;
The first phosphor layer is provided on the same side of the substrate as the side on which excitation light for exciting the first phosphor layer is incident; and
2. The light source device according to claim 1, wherein the second phosphor layer is provided on the same side as the side on which excitation light for exciting the second phosphor layer of the substrate is incident.   The excitation light that excites the first phosphor layer and the excitation light that excites the second phosphor layer are separated from the light emitted from the light source and emitted from the first phosphor layer. The light source according to claim 7, further comprising: a second synthesis optical system that synthesizes the first fluorescence and the second fluorescence emitted from the second phosphor layer. apparatus.   The second synthesis optical system includes a part of light emitted from the light source, the first fluorescence emitted from the first phosphor layer, and the first phosphor emitted from the second phosphor layer. The light source device according to claim 8, wherein the second fluorescence is synthesized. The second combining optical system includes a first mirror, a second mirror, a third mirror, and a fourth mirror,
The first mirror transmits a part of the light emitted from the light source toward the second mirror, reflects the remaining part toward the first phosphor layer, and the first mirror. Transmitting the first fluorescence emitted from the phosphor layer toward the fourth mirror,
The second mirror reflects the light transmitted through the first mirror toward the second phosphor layer, and causes the second mirror emitted from the second phosphor layer to the third mirror. Transparent to
The third mirror reflects the second fluorescence transmitted through the second mirror toward the fourth mirror;
The light source according to claim 8 or 9, wherein the fourth mirror transmits the first fluorescence transmitted through the first mirror and reflects the second fluorescence reflected by the third mirror. apparatus.   The angle formed by a line connecting the center of the first mirror and the rotation axis and a line connecting the center of the second mirror and the rotation axis when viewed from a direction orthogonal to the first main surface of the substrate is 90. The light source device according to claim 10, wherein the light source device has a degree of 270 degrees or more and 270 degrees or less.   The angle formed by the line connecting the center of the third mirror and the rotation axis and the line connecting the center of the fourth mirror and the rotation axis when viewed from the direction orthogonal to the first main surface of the substrate is 90. The light source device according to claim 10 or 11, wherein the light source device has a degree of 270 degrees or more and 270 degrees or less. The second combining optical system includes a first mirror, a second mirror, a third mirror, a fourth mirror, a fifth mirror, and a sixth mirror.
The first mirror transmits a part of the light emitted from the light source toward the second mirror, reflects the remaining part toward the first phosphor layer, and the first mirror. Transmitting the first fluorescence emitted from the phosphor layer toward the sixth mirror,
The second mirror transmits a part of the light transmitted through the first mirror toward the third mirror and reflects the remaining part toward the fifth mirror,
The third mirror reflects the second fluorescence emitted from the second phosphor layer and reflects the excitation light transmitted through the second mirror toward the second phosphor layer. To penetrate toward
The fourth mirror reflects the second fluorescence transmitted through the third mirror toward the fifth mirror;
The fifth mirror reflects the excitation light reflected by the second mirror toward the sixth mirror and reflects the second fluorescence reflected by the fourth mirror by the reflection direction of the excitation light reflected by itself. Is transmitted in the same direction as
The sixth mirror transmits the first fluorescence transmitted through the first mirror and reflects both the excitation light reflected by the fifth mirror and the second fluorescence transmitted through the fifth mirror. The light source device according to claim 9.   The light source device according to claim 13, wherein the second mirror is disposed on an optical path of light that linearly travels between the first mirror and the third mirror.   When viewed from a direction orthogonal to the first main surface of the substrate, the fourth mirror overlaps the third mirror, the fifth mirror overlaps the second mirror, and the sixth mirror overlaps the first mirror. The light source device according to claim 14, wherein the light source device is a light source device.   The light source device according to claim 1, wherein the excitation light is blue light, the first fluorescence is red light, and the second fluorescence is green light. .   The light source device according to claim 1, wherein the light source is a semiconductor element.   The light source device according to claim 17, wherein the light source is a semiconductor laser.   The light intensity of excitation light incident on the second phosphor layer is higher than the light intensity of excitation light incident on the first phosphor layer. The light source device according to 1. A first reflection surface that reflects the first fluorescence emitted from the first phosphor layer is formed between the substrate and the first phosphor layer, and
The second reflecting surface for reflecting the second fluorescence emitted from the second phosphor layer is formed between the substrate and the second phosphor layer. Item 20. The light source device according to any one of Items 1 to 19. The light source device according to any one of claims 1 to 20,
A light modulation device that modulates light emitted from the light source device according to image information;
A projection optical system that projects modulated light from the light modulation device as a projection image;
A projector comprising:

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