Light source device and projector

Abstract

To provide a light source device capable of emitting light having a desired hue.SOLUTION: The light source apparatus according to the present disclosure includes the first light source that outputs the first light, the second light source that outputs the second light, the wavelength converter that converts the first light and the second light into the third light, the first optical layer that transmits the first light and reflects the third light, the light guide section that guides the light, the incident angle adjustment system that adjusts the angle of incidence of the second light incident on the wavelength converter, and the second optical layer that transmits the second light and reflects the third light. The wavelength conversion element has a first surface, a second surface, and a third surface. The first light enters the wavelength conversion element from the third surface via the first optical layer and the light guide section. The third light is emitted from a region on the first surface side of the light guide portion. The second light is adjusted in incident angle by the incident angle adjustment optical system, and then enters the area at the second surface side of the light guide section via the second optical layer, and a part of the second light enters the wavelength conversion element from the third surface to be converted into the third light, and another part of the second light is emitted from the area at the first surface side of the light guide section.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a light source device and a projector. [Background technology]

[0002] As a light source device for use in a projector, a light source device that utilizes fluorescence emitted from a phosphor when the phosphor is irradiated with excitation light emitted from a light-emitting element has been proposed. Patent Document 1 listed below discloses a light source device that includes a first light source that emits excitation light, a phosphor rod that wavelength-converts the excitation light to yellow light, a second light source that emits blue light, and a transparent rod that transmits yellow light and blue light. Patent Document 1 describes that in this light source device, white light, which is a combination of yellow light and blue light, can be extracted from the transparent rod by turning on the first light source and the second light source. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-9981 Summary of the Invention [Problem to be solved by the invention]

[0004] The light source device of Patent Document 1 has a blue light-emitting diode (LED) constituting a second light source, which is positioned opposite the side surface of a transparent rod. Blue light is incident on the side surface of the transparent rod and exits from the end surface. However, with this configuration, the blue light has many angular components, and many of these components are incident on the side surface of the transparent rod at angles smaller than the critical angle before reaching the end surface of the transparent rod. As a result, much of the blue light leaks out from the side surface of the transparent rod, making it difficult to adjust the ratio of the amount of yellow light to the amount of blue light. This poses a problem in that the desired white light cannot be obtained. [Means for solving the problem]

[0005] In order to solve the above problems, a light source device according to one embodiment of the present invention includes: a first light source that emits first light in a first wavelength band; a second light source that emits second light in a second wavelength band; a wavelength conversion element that converts the first light and the second light into third light in a third wavelength band different from the first wavelength band and the second wavelength band; a first optical layer disposed between the first light source and the wavelength conversion element and transmitting the first light and reflecting the third light; a light guide disposed between the first optical layer and the wavelength conversion element and guiding each of the first light, the second light, and the third light; an incident angle adjusting optical system disposed between the second light source and the light guide and adjusting the incident angle of the second light with respect to the wavelength conversion element; and a second optical layer disposed between the incident angle adjusting optical system and the light guide and transmitting the second light and reflecting the third light. The wavelength conversion element has first and second surfaces facing opposite to each other and a third surface intersecting the first and second surfaces. The first light emitted from the first light source passes through the first optical layer and the light guiding section and enters the wavelength conversion element from the third surface. The third light converted by the wavelength conversion element travels through the light guiding section and is emitted from a region of the light guiding section on the first surface side. The second light emitted from the second light source has its incident angle adjusted by the incident angle adjusting optical system and enters the region of the light guiding section on the second surface side through the second optical layer. A portion of the second light that entered the light guiding section enters the wavelength conversion element from the third surface and is converted into the third light, and another portion of the second light that entered the light guiding section is emitted from the region of the light guiding section on the first surface side.

[0006] A projector according to one aspect of the present invention comprises a light source device according to one aspect of the present invention, an optical modulation device that modulates light emitted from the light source device, and a projection optical device that projects the light modulated by the optical modulation device. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic configuration diagram of a projector according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the light source device of the first embodiment. [Figure 3] 3 is a cross-sectional view of the light source device taken along line III-III in FIG. 2. FIG. [Figure 4] FIG. 10 is a cross-sectional view of a light source device according to a second embodiment. [Figure 5] 10 is a diagram illustrating the operation of the light source device of the third embodiment, when the light source device is viewed from the Z-axis direction. FIG. [Figure 6] 10A and 10B are diagrams illustrating the operation of the light source device of the third embodiment, when the light source device is viewed from the Y-axis direction. [Figure 7] FIG. 10 is a cross-sectional view of a light source device according to a fourth embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a light source device according to a fifth embodiment. [Figure 9] FIG. 10 is a cross-sectional view of a light source device according to a sixth embodiment. [Figure 10] FIG. 13 is a cross-sectional view of a light source device according to a seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] [First embodiment] A first embodiment of the present invention will be described below with reference to the drawings. The projector of this embodiment is an example of a projector that uses a liquid crystal panel as a light modulation device. In the drawings below, the dimensions of some components may be shown on different scales to make them easier to see.

[0009] FIG. 1 is a schematic configuration diagram of a projector 10 according to the present embodiment. 1, the projector 10 of this embodiment is a projection-type image display device that displays a color image on a screen SCR, which is a projection surface. The projector 10 is equipped with three light modulation devices corresponding to red light LR, green light LG, and blue light LB.

[0010] The projector 10 includes an illumination device 20, a color separation light-guiding optical system 200, a red light optical modulation device 400R, a green light optical modulation device 400G, a blue light optical modulation device 400B, a light combining element 500, and a projection optical device 600.

[0011] The illumination device 20 includes a light source device 30A, an integrator optical system 90, a polarization conversion element 97, and a superimposing optical system 94. The illumination device 20 emits white light LW containing red light LR, green light LG, and blue light LB. The specific configuration of the illumination device 20 will be described later.

[0012] In the following drawings, an XYZ Cartesian coordinate system will be used as necessary. The X axis is an axis parallel to the optical axis AX1 of the lighting device 20 and extends along the front-to-rear direction of the projector 10. The Y axis is an axis perpendicular to the X axis and extends along the up-down direction of the projector 10. The Z axis is an axis perpendicular to the X and Y axes and extends along the left-to-right direction of the projector 10. These notations are used to explain the positional relationship of the components of the projector 10 and do not limit the installation posture or direction of the projector 10. The optical axis AX1 of the lighting device 20 is the central axis of the white light LW emitted from the lighting device 20.

[0013] In the following explanation, one of the two directions along the X axis will be referred to as the +X direction, and the opposite direction will be referred to as the -X direction. One of the two directions along the Y axis will be referred to as the +Y direction, and the opposite direction will be referred to as the -Y direction. One of the two directions along the Z axis will be referred to as the +Z direction, and the opposite direction will be referred to as the -Z direction. When referring to two directions along the X axis collectively without distinction, they will be referred to as the X-axis direction. When referring to two directions along the Y axis collectively without distinction, they will be referred to as the Y-axis direction. When referring to two directions along the Z axis collectively without distinction, they will be referred to as the Z-axis direction.

[0014] The color separation and light-guiding optical system 200 includes a first dichroic mirror 210, a second dichroic mirror 220, a first reflecting mirror 230, a second reflecting mirror 240, a third reflecting mirror 250, a first relay lens 260, and a second relay lens 270. The color separation and light-guiding optical system 200 separates white light LW emitted from the illumination device 20 into red light LR, green light LG, and blue light LB, and guides the red light LR to a red light optical modulation device 400R, the green light LG to a green light optical modulation device 400G, and the blue light LB to a blue light optical modulation device 400B.

[0015] A field lens 300R is disposed between the color separation and light-guiding optical system 200 and the red light optical modulator 400R. A field lens 300G is disposed between the color separation and light-guiding optical system 200 and the green light optical modulator 400G. A field lens 300B is disposed between the color separation and light-guiding optical system 200 and the blue light optical modulator 400B. The field lens 300R collimates the chief ray of the red light LR incident on the red light optical modulator 400R. The field lens 300G collimates the chief ray of the green light LG incident on the green light optical modulator 400G. The field lens 300B collimates the chief ray of the blue light LB incident on the blue light optical modulator 400B.

[0016] The first dichroic mirror 210 transmits the red light LR and reflects the green light LG and blue light LB. The second dichroic mirror 220 reflects the green light LG and transmits the blue light LB. The first reflecting mirror 230 reflects the red light LR. The second reflecting mirror 240 and the third reflecting mirror 250 each reflect the blue light LB.

[0017] The red light optical modulator 400R, the green light optical modulator 400G, and the blue light optical modulator 400B each modulate the color light incident thereon in accordance with image information to generate image light. Each of the red light optical modulator 400R, the green light optical modulator 400G, and the blue light optical modulator 400B is composed of a liquid crystal panel.

[0018] Although not shown in the figure, incident-side polarizing plates are arranged between field lens 300R and red light optical modulator 400R, between field lens 300G and green light optical modulator 400G, and between field lens 300B and blue light optical modulator 400B. In addition, exit-side polarizing plates are arranged between red light optical modulator 400R and light combining element 500, between green light optical modulator 400G and light combining element 500, and between blue light optical modulator 400B and light combining element 500. The incident-side polarizing plate and the exit-side polarizing plate only transmit light linearly polarized in a specific direction.

[0019] The light combining element 500 receives the image lights emitted from the red light optical modulation device 400R, the green light optical modulation device 400G, and the blue light optical modulation device 400B, combines the image lights corresponding to the red light LR, the green light LG, and the blue light LB, and emits the combined image light toward the projection optical device 600. The light combining element 500 may be, for example, a cross dichroic prism.

[0020] The projection optical device 600 is composed of a plurality of projection lenses. The projection optical device 600 enlarges and projects the image light combined by the light combining element 500 onto the screen SCR, thereby displaying an image on the screen SCR.

[0021] The configurations of the light source device 30A and the illumination device 20 will be described below. Fig. 2 is a cross-sectional view of the light source device 30A of this embodiment, Fig. 3 is a cross-sectional view of the light source device 30A taken along line III-III in Fig. 2.

[0022] As shown in Figures 2 and 3, the light source device 30A of this embodiment includes a first light source 41, a wavelength conversion element 51, a first light guiding section 71, a second light guiding section 72, a first optical layer 61, a second light source 82, a collimating optical system 83, an incident angle adjustment optical system 45, a second optical layer 62, and a reflective layer 65.

[0023] The first light source 41 has a third light source 43 and a fourth light source 44. The third light source 43 and the fourth light source 44 have the same configuration. Each of the third light source 43 and the fourth light source 44 has a plurality of light-emitting elements 411. The plurality of light-emitting elements 411 are mounted on a substrate 412. Note that the number of light-emitting elements 411 included in the first light source 41 is not particularly limited.

[0024] The light emitting element 411 emits excitation light rays in a first wavelength band. The light emitting element 411 is composed of a light emitting diode (LED). By configuring the light emitting element 411 with an LED, it is possible to reduce the cost of the light source device 30A and improve the light emitting efficiency. The light emitting element 411 is arranged opposite the wavelength conversion element 51 and emits excitation light rays toward the wavelength conversion element 51. The first wavelength band is, for example, a wavelength band from purple to blue of 400 nm to 480 nm. The center wavelength of the first wavelength band is, for example, 455 nm. The multiple light emitting elements 411 are arranged along the X-axis direction, which is the longitudinal direction of the wavelength conversion element 51.

[0025] The third light source 43 emits a plurality of excitation light beams toward the wavelength conversion element 51 via the first light guiding section 71. The fourth light source 44 is disposed opposite to the third light source 43 with the wavelength conversion element 51 interposed therebetween. The fourth light source 44 emits a plurality of blue excitation light beams toward the wavelength conversion element 51 via the second light guiding section 72. In this manner, the first light source 41 causes excitation light E of a first wavelength band consisting of a plurality of blue excitation light beams to be incident on the wavelength conversion element 51. The excitation light E in this embodiment corresponds to the first light in the claims.

[0026] The wavelength conversion element 51 has a plate-like shape extending along the X-axis and has six faces. The sides of the wavelength conversion element 51 extending along the X-axis are longer than the sides extending along the Y-axis and the Z-axis. The X-axis direction corresponds to the longitudinal direction of the wavelength conversion element 51. The Y-axis direction is a direction parallel to the shortest side of the wavelength conversion element 51. The length of the sides along the Y-axis is shorter than the length of the sides along the Z-axis. That is, the cross-sectional shape of the wavelength conversion element 51 cut along a plane along the YZ plane is rectangular, as shown in FIG. 3.

[0027] The wavelength conversion element 51 has a first end face 51a and a second end face 51b, a first side face 51c and a second side face 51d, a third side face 51e and a fourth side face 51f. The first end face 51a and the second end face 51b face opposite each other in the X-axis direction along the longitudinal direction of the wavelength conversion element 51. In this embodiment, the first end face 51a is located on the +X side, which is one side in the X-axis direction. The second end face 51b is located on the -X side, which is the other side in the X-axis direction. The first end face 51a of this embodiment corresponds to face 1 in the claims. The second end face 51b of this embodiment corresponds to face 2 in the claims.

[0028] The first side surface 51c and the second side surface 51d intersect the first end surface 51a and the second end surface 51b and face opposite each other along the Y axis. In this embodiment, the first side surface 51c is located on the +Y side, which is one side in the Y axis direction. The second side surface 51d is located on the -Y side, which is the other side in the Y axis direction. Excitation light E is incident on the first side surface 51c from the third light source 43 via the first light guiding section 71. Excitation light E is incident on the second side surface 51d from the fourth light source 44 via the second light guiding section 72. The first side surface 51c and the second side surface 51d in this embodiment correspond to the third side of the claims.

[0029] 3, the third side surface 51e and the fourth side surface 51f intersect with the first end surface 51a and the second end surface 51b, and with the first side surface 51c and the second side surface 51d, and face opposite each other in the Z axis direction. The third side surface 51e is located on one side, the +Z side, in the Z axis direction. The fourth side surface 51f is located on the other side, the -Z side, in the Z axis direction.

[0030] The wavelength conversion element 51 contains at least a yellow phosphor and converts the excitation light E in a first wavelength band emitted from the first light source 41 into yellow fluorescence Y in a third wavelength band that is different from the first wavelength band and a second wavelength band described later. As will be described in detail later, a portion of the yellow fluorescence Y generated inside the wavelength conversion element 51 is emitted from the first side surface 51c to the first light guiding unit 71, and another portion of the yellow fluorescence Y is emitted from the second side surface 51d to the second light guiding unit 72.

[0031] The wavelength conversion element 51 includes a ceramic phosphor made of a polycrystalline phosphor that converts the wavelength of the excitation light E into yellow fluorescence Y. The wavelength conversion element 51 is made of a phosphor with light scattering properties, a so-called scattering phosphor. The third waveband of the yellow fluorescence Y is, for example, a yellow waveband of 490 to 750 nm. The central wavelength of the third waveband is, for example, 550 nm. In other words, the fluorescence Y is yellow fluorescence containing a red light component and a green light component. The yellow fluorescence Y of this embodiment corresponds to the third light in the claims.

[0032] The wavelength conversion element 51 may contain a single crystal phosphor instead of a polycrystalline phosphor. Alternatively, the wavelength conversion element 51 may be made of fluorescent glass. Alternatively, the wavelength conversion element 51 may be made of a material in which a large number of phosphor particles are dispersed in a binder made of glass or resin. A wavelength conversion element 51 made of such a material converts blue excitation light E into yellow fluorescence Y.

[0033] Specifically, the material of the wavelength conversion element 51 includes, for example, an yttrium-aluminum-garnet (YAG) phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, the material of the wavelength conversion element 51 may be a material obtained by mixing raw material powders containing constituent elements such as Y2O3, Al2O3, and CeO3 and causing a solid-phase reaction, Y-Al-O amorphous particles obtained by a wet method such as a coprecipitation method or a sol-gel method, or YAG particles obtained by a gas-phase method such as a spray-drying method, a flame pyrolysis method, or a thermal plasma method.

[0034] The first optical layer 61 is disposed between the first light source 41 and the wavelength conversion element 51. That is, the first optical layer 61 is disposed between the third light source 43 and the wavelength conversion element 51, and between the fourth light source 44 and the wavelength conversion element 51. The first optical layer 61 has optical properties of transmitting the excitation light E and reflecting the yellow fluorescence Y. The first optical layer 61 is formed of, for example, a dielectric multilayer film. The first optical layer 61 is disposed on a second side surface 73d of a translucent member 73, which will be described later, facing the first light source 41.

[0035] The first light guiding section 71 and the second light guiding section 72 are disposed between the first optical layer 61 and the wavelength conversion element 51. That is, the first light guiding section 71 is disposed between the first optical layer 61 facing the third light source 43 and the first side surface 51c of the wavelength conversion element 51. The second light guiding section 72 is disposed between the first optical layer 61 facing the fourth light source 44 and the second side surface 51d of the wavelength conversion element 51. The first light guiding section 71 and the second light guiding section 72 have the same configuration.

[0036] The first light guiding section 71 and the second light guiding section 72 each guide the excitation light E emitted from the first light source 41, the yellow fluorescence Y converted by the wavelength conversion element 51, and the blue light B emitted from the second light source 82. In this embodiment, the first light guiding section 71 and the second light guiding section 72 each include a light-transmitting member 73 that transmits the excitation light E, the yellow fluorescence Y, and the blue light B. The light-transmitting member 73 is a plate-shaped member, and is bonded to the first side surface 51 c and the second side surface 51 d of the wavelength conversion element 51 with an optical adhesive (not shown). The first light guiding section 71 and the second light guiding section 72 in this embodiment correspond to the light guiding section in the claims.

[0037] The light-transmitting member 73 is made of a light-transmitting material such as borosilicate glass (e.g., BK7), quartz, synthetic quartz, crystal, SiC, GaN, MgO, YAG, sapphire, or diamond. As described above, the light-transmitting member 73 must be made of a material that can transmit the excitation light E, yellow fluorescence Y, and blue light B. The light-transmitting member 73 has a plate-like shape extending along the X-axis. As shown in FIG. 3, the light-transmitting member 73 has a rectangular cross-section cut along the YZ plane and extends elongatedly in the X-axis direction. As shown in FIG. 2, of the two end faces of the light-transmitting member 73 that intersect with the X-axis, the end face on the side of the first end face 51a of the wavelength conversion element 51 is referred to as the first end face 73a, and the end face on the side of the second end face 51b of the wavelength conversion element 51 is referred to as the second end face 73b. Of the side surfaces of the light-transmitting member 73, the side surfaces in contact with the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 are referred to as first side surfaces 73c, and the side surface opposite to the first side surface 73c is referred to as second side surface 73d. Note that the light-transmitting member 73 may have a shape other than a plate shape (rectangular parallelepiped).

[0038] It is desirable that the thermal conductivity of the light-transmitting member 73 be greater than that of the wavelength conversion element 51. Materials for the light-transmitting member 73 that satisfy this relationship include, for example, SiC, GaN, MgO, YAG, sapphire, and diamond. With this configuration, heat from the wavelength conversion element 51 is efficiently transferred to the light-transmitting member 73, thereby suppressing a temperature rise in the wavelength conversion element 51. This makes it possible to suppress a decrease in conversion efficiency due to a temperature rise in the wavelength conversion element 51.

[0039] The second light source 82 includes a first light-emitting element 821 and a second light-emitting element 822. The number of light-emitting elements included in the second light source 82 is two in this embodiment, but is not particularly limited thereto. The light-emitting elements 821 and 822 emit blue light beams B1 and B2 in a second wavelength band toward the light-transmitting member 73. The first light-emitting element 821 and the second light-emitting element 822 are each configured as a chip-shaped laser diode (LD) that emits the blue light beams B1 and B2. By configuring the light-emitting elements 821 and 822 as LDs, which are point light sources, collimated light can be obtained using the collimating optical system 83. In this embodiment, the light-emitting elements 821 and 822 are disposed opposite the second end surface 73b of the light-transmitting member 73 that constitutes the first light-guiding section 71. The ellipses B1 and B2 in FIG. 3 schematically represent the intensity distributions of the blue light beams B1 and B2. The second wavelength band is, for example, a blue wavelength band of 440 nm to 450 nm. The center wavelength of the second wavelength band is, for example, 445 nm. The blue light B emitted from the second light source is composed of blue light beams B1 and B2. The blue light B in this embodiment corresponds to the second light in the claims.

[0040] Each light-emitting element 821, 822 is arranged so that the light-emitting surface of the laser diode chip faces the +X side, the long side of the rectangular light-emitting surface faces the Y-axis direction, and the short side of the light-emitting surface faces the Z-axis direction. The central axis of each blue light beam B1, B2 emitted from each light-emitting element 821, 822 is parallel to the X-axis. The divergence angle of each blue light beam B1, B2 differs in the Y-axis direction and the Z-axis direction, with the divergence angle in the Z-axis direction being significantly larger than the divergence angle in the Y-axis direction. Therefore, as shown in FIG. 3, the cross-section of each blue light beam B1, B2 emitted from each light-emitting element 821, 822 perpendicular to the central axis is an elongated ellipse, with the major axis of the ellipse facing the Z-axis direction and the minor axis of the ellipse facing the Y-axis direction.

[0041] The collimating optical system 83 is disposed on the light emission side of the second light source 82. The collimating optical system 83 has a first collimating element 831 and a second collimating element 832. Each of the first collimating element 831 and the second collimating element 832 is composed of a collimator lens. The first collimating element 831 is disposed on the light emission side of the first light-emitting element 821 and collimates the blue light beam B1 emitted from the first light-emitting element 821. The second collimating element 832 is disposed on the light emission side of the second light-emitting element 822 and collimates the blue light beam B2 emitted from the second light-emitting element 822.

[0042] The incident angle adjustment optical system 45 is disposed between the second light source 82 and the first and second light guiding units 71 and 72. The incident angle adjustment optical system 45 adjusts the angle of incidence of the blue light B emitted from the second light source 82 with respect to the wavelength conversion element 51. The incident angle adjustment optical system 45 has a first convex lens 451 and a second convex lens 452. As an example, the incident angle adjustment optical system 45 has two convex lenses 451 and 452, but the number of convex lenses is not particularly limited and may be three or more. The curvature of the lens surface of the first convex lens 451 and the curvature of the lens surface of the second convex lens 452 are different from each other. That is, the focal length of the first convex lens 451 and the focal length of the second convex lens 452 are different from each other. Furthermore, the first convex lens 451 and the second convex lens 452 are interchangeable. As a specific configuration, for example, like a turret of a microscope, two convex lenses 451, 452 may be fixed on a rotatable support member, and the convex lenses to be used may be switched by rotating the support member. However, the present invention is not limited to this configuration.

[0043] The second optical layer 62 is disposed on the −X side of the wavelength conversion element 51, the first light guiding section 71, and the second light guiding section 72. Specifically, the second optical layer 62 is disposed opposite the second end surface 51b of the wavelength conversion element 51 and the second end surface 73b of the light-transmitting member 73. The second optical layer 62 is composed of a dielectric multilayer film that transmits blue light and reflects yellow light. Therefore, the blue light B emitted from the second light source 82 passes through the collimating optical system 83 and the incident angle adjusting optical system 45, then transmits through the second optical layer 62 and enters the first light guiding section 71 and the second light guiding section 72. The yellow fluorescence Y converted by the wavelength conversion element 51 propagates through the first light guiding section 71 and the second light guiding section 72 toward the −X side, and upon entering the second optical layer 62, is reflected by the second optical layer 62 and propagates through the first light guiding section 71 and the second light guiding section 72 toward the +X side.

[0044] As shown in FIG. 3 , the reflective layer 65 is disposed on both sides of the first light guiding section 71, the second light guiding section 72, and the wavelength conversion element 51 in the Z-axis direction. The reflective layer 65 reflects the excitation light E, the yellow fluorescence Y, and the blue light B. Therefore, the reflective layer 65 does not directly enter the wavelength conversion element 51, but reflects the excitation light E that enters the reflective layer 65 and makes it enter the wavelength conversion element 51. This improves the conversion efficiency of the excitation light E to the yellow fluorescence Y. The reflective layer 65 also reflects the yellow fluorescence Y and the blue light B that propagate through the first light guiding section 71 and the second light guiding section 72. This reduces the loss of the yellow fluorescence Y and the blue light B. The reflective layer 65 is formed of, for example, a metal film, a dielectric multilayer film, a scattering layer, or the like.

[0045] 1, an integrator optical system 90 is provided on the light emission side of the light source device 30A. The integrator optical system 90 has a first lens array 91 and a second lens array 92. The integrator optical system 90, together with a superimposing optical system 94, functions as a uniform illumination optical system that uniformizes the intensity distribution of the white light LW emitted from the light source device 30A in each of the light modulation devices 400R, 400G, and 400B, which are the illuminated areas. The white light LW emitted from the light source device 30A is incident on the first lens array 91.

[0046] The first lens array 91 has a plurality of first lenses 91a. The plurality of first lenses 91a are arranged in a matrix in a plane parallel to the YZ plane orthogonal to the optical axis AX1 of the illumination device 20. The plurality of first lenses 91a split the white light LW emitted from the light source device 30A into a plurality of partial light beams. The shape of each of the first lenses 91a is rectangular, which is approximately similar to the shape of the image formation areas of the light modulation devices 400R, 400G, and 400B. This allows each of the partial light beams emitted from the first lens array 91 to efficiently enter the image formation areas of the light modulation devices 400R, 400G, and 400B.

[0047] The white light LW emitted from the first lens array 91 travels toward the second lens array 92. The second lens array 92 is disposed opposite the first lens array 91. The second lens array 92 has a plurality of second lenses 92a corresponding to the plurality of first lenses 91a of the first lens array 91. The second lens array 92, together with the superimposing optical system 94, forms each of the images of the plurality of first lenses 91a of the first lens array 91 near the image forming areas of the light modulation devices 400R, 400G, and 400B. The plurality of second lenses 92a are arranged in a matrix in a plane parallel to the YZ plane that is perpendicular to the optical axis AX1 of the illumination device 20. The superimposing optical system 94 is composed of a single convex lens.

[0048] In this embodiment, the first lenses 91a of the first lens array 91 and the second lenses 92a of the second lens array 92 have the same size, but may have different sizes. Also, in this embodiment, the first lenses 91a of the first lens array 91 and the second lenses 92a of the second lens array 92 are arranged so that their optical axes coincide with each other, but they may be arranged eccentrically with each other.

[0049] The polarization conversion element 97 converts the polarization direction of the white light LW emitted from the second lens array 92. Specifically, the polarization conversion element 97 converts each partial beam of the white light LW split by the first lens array 91 and emitted from the second lens array 92 into linearly polarized light. The polarization conversion element 97 has a polarization separation layer (not shown), a reflection layer (not shown), and a phase difference layer (not shown). The polarization separation layer transmits one linearly polarized component of the polarization components contained in the white light LW emitted from the light source device 30A as is, and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1. The reflection layer reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1. The phase difference layer converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

[0050] The behavior of light in the light source device 30A of this embodiment will be described below. As shown in FIG. 2, in the light source device 30A, the excitation light E emitted from the first light source 41 passes through the first optical layer 61 and the light-transmitting member 73 and enters the wavelength conversion element 51.

[0051] When excitation light E is incident on the wavelength conversion element 51, the phosphor contained in the wavelength conversion element 51 is excited, and yellow fluorescence Y is emitted from any light-emitting point. At this time, the excitation light E incident on the phosphor is diffused and propagates over an area wider than the incident area, thereby expanding the width of the emission area of ​​the yellow fluorescence Y, resulting in so-called bleeding of the yellow fluorescence Y.

[0052] The yellow fluorescence Y that is incident from the light-emitting point of the wavelength conversion element 51 onto the first side surface 51c and the second side surface 51d at an incident angle less than the critical angle is emitted from the wavelength conversion element 51, enters the light-transmitting member 73, and propagates inside the light-transmitting member 73. At this time, the fluorescence Y traveling toward the +X side is reflected by the first optical layer 61 and re-enters the wavelength conversion element 51. In the present embodiment, since the wavelength conversion element 51 is made of a scattering phosphor, the yellow fluorescence Y is scattered inside the wavelength conversion element 51, is emitted again from the wavelength conversion element 51 to the light-transmitting member 73, propagates through the light-transmitting member 73, and then emitted to the outside from the first end surface 73a of the light-transmitting member 73.

[0053] Yellow fluorescence generated inside the wavelength conversion element 51 and incident on the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 at an incident angle equal to or greater than the critical angle is once totally reflected by the first side surface 51c and the second side surface 51d of the wavelength conversion element 51. However, in the present embodiment, because the wavelength conversion element 51 is made of a scattering phosphor, the traveling direction of the yellow fluorescence changes inside the wavelength conversion element 51, and the incident angle of the yellow fluorescence Y with respect to the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 changes. As a result, the yellow fluorescence Y is emitted from the wavelength conversion element 51 to the light-transmitting member 73, propagates through the light-transmitting member 73, and then emitted to the outside from the first end surface 73a of the light-transmitting member 73.

[0054] On the other hand, the yellow fluorescence Y that travels through the light-transmitting member 73 toward the -X side and reaches the second optical layer 62 is reflected by the second optical layer 62, travels toward the +X side, and follows the same path as the above-mentioned yellow fluorescence Y. That is, the yellow fluorescence Y propagates inside the light-transmitting member 73 or the wavelength conversion element 51 while repeatedly reflecting between the first optical layer 61 and the first side surface 51c or the second side surface 51d of the wavelength conversion element 51, and is emitted to the outside from the first end surface 73a of the light-transmitting member 73 or the first end surface 51a of the wavelength conversion element 51.

[0055] In contrast, blue light ray B1 emitted from first light-emitting element 821 of second light source 82 is collimated by first collimating element 831 of collimating optical system 83. Blue light ray B2 emitted from second light-emitting element 822 of second light source 82 is collimated by second collimating element 832 of collimating optical system 83. Next, blue light B passing through collimating optical system 83 is focused by first convex lens 451 of incident angle adjustment optical system 45. At this time, because blue light B is composed of blue light ray B1 and blue light ray B2, each of blue light ray B1 and blue light ray B2 is refracted by first convex lens 451 in a direction that brings each of blue light ray B1 and B2 closer to optical axis AX1 while in a collimated state.

[0056] As a result, blue light ray B1 incident on the light-transmitting member 73 of the first light guiding unit 71 travels obliquely inside the light-transmitting member 73 and is incident on the wavelength conversion element 51 at an arbitrary position on the first side surface 51c. Similarly, blue light ray B2 incident on the light-transmitting member 73 of the second light guiding unit 72 travels obliquely inside the light-transmitting member 73 and is incident on the wavelength conversion element 51 at an arbitrary position on the second side surface 51d. A portion of the blue light rays B1 and B2 incident on the wavelength conversion element 51 contributes to wavelength conversion as excitation light, is converted into yellow fluorescence Y, travels inside the light-transmitting member 73, and is emitted to the outside from the first end surface 73a of the light-transmitting member 73. Meanwhile, another portion of the blue light rays B1 and B2 does not contribute to wavelength conversion and is emitted to the outside from the first end surface 73a of the light-transmitting member 73 as blue light B.

[0057] In this way, the light source device 30A can emit to the outside white light LW that is a combination of the yellow fluorescence Y emitted from the first end face 51a of the wavelength conversion element 51 and the first end face 73a of the light-transmitting member 73 and the blue light B emitted from the first end face 73a of the light-transmitting member 73. This makes it possible for the light source device 30A to reduce the etendue of the white light LW, thereby reducing loss of the white light LW in optical members such as the integrator optical system 90 that are arranged downstream of the light source device 30A. As a result, the utilization efficiency of the white light LW in the light source device 30A can be improved.

[0058] (Effects of the first embodiment) The light source device 30A of this embodiment includes: a first light source 41 that emits excitation light E; a second light source 82 that emits blue light B; a wavelength conversion element 51 that converts the excitation light E and the blue light B into yellow fluorescence Y; a first optical layer 61 that is disposed between the first light source 41 and the wavelength conversion element 51 and that transmits the excitation light E and reflects the fluorescence Y; a first light guiding section 71 and a second light guiding section 72 that are disposed between the first optical layer 61 and the wavelength conversion element 51 and that guide the excitation light E, the blue light B, and the yellow fluorescence Y, respectively; an incident angle adjustment optical system 45 that is disposed between the second light source 82 and each of the light guiding sections 71, 72 and that adjusts the angle of incidence of the blue light B with respect to the wavelength conversion element 51; and a second optical layer 62 that is disposed between the incident angle adjustment optical system 45 and each of the light guiding sections 71, 72 and that transmits the blue light B and reflects the yellow fluorescence Y. The wavelength conversion element 51 has a first end face 51a and a second end face 51b facing opposite each other, and a first side face 51c and a second side face 51d intersecting the first end face 51a and the second end face 51b. Excitation light E emitted from the first light source 41 passes through the first optical layer 61 and the light guiding sections 71 and 72 and enters the wavelength conversion element 51 from the first side face 51c and the second side face 51d. Yellow fluorescence Y converted by the wavelength conversion element 51 travels through the light guiding sections 71 and 72 and is emitted from the first end face 73a. The blue light B emitted from the second light source 82 has its incident angle adjusted by the incident angle adjustment optical system 45 and enters the second end face 73b through the second optical layer 62, and a portion of the blue light B enters the wavelength conversion element 51 from the first side face 51c and the second side face 51d and is converted into yellow fluorescence Y, and the other portion of the blue light B is emitted from the first end face 73a.

[0059] In conventional light source devices, a blue LED is positioned opposite the side of a transparent rod, and blue light enters the rod from the side. Therefore, much of the blue light enters the rod's side multiple times at angles of incidence smaller than the critical angle before reaching the rod's end face. As a result, much of the blue light leaks out from the side of the transparent rod, reducing the balance between the amount of yellow light and the amount of blue light. However, conventional light source devices lack a means for adjusting the ratio between the amount of yellow light and the amount of blue light, making it difficult to obtain the desired white light. While the ratio can be adjusted by sufficiently reducing the amount of yellow light, the amount of white light decreases.

[0060] To address this issue, the light source device 30A of this embodiment is equipped with an incident angle adjustment optical system 45 in which a first convex lens 451 and a second convex lens 452 having different focal lengths are interchangeable, and by interchanging the first convex lens 451 and the second convex lens 452, the incident angle of blue light B relative to the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 can be adjusted.

[0061] For example, assume that the focal length of the first convex lens 451 is longer than the focal length of the second convex lens 452. That is, assume that the curvature of the lens surface of the first convex lens 451 is smaller than the curvature of the lens surface of the second convex lens 452. In this case, as shown in FIG. 2, when the first convex lens 451 is used, the angle of incidence of the blue light B with respect to the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 becomes relatively large, so that the blue light B enters a region relatively close to the first end surface 51a of the wavelength conversion element 51. In this case, the blue light B travels a relatively long distance through each of the light guiding sections 71, 72 and then enters the wavelength conversion element 51 at a position close to the light exit port. Therefore, the proportion of the blue light B that contributes to wavelength conversion and is converted into yellow fluorescence Y becomes relatively small, and the ratio of the amount of blue light to the amount of yellow light becomes large. Conversely, when the second convex lens 452 is used, the angle of incidence of the blue light B with respect to the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 becomes relatively small, so that the blue light B is incident on an area relatively close to the second end surface 51b of the wavelength conversion element 51. At this time, the proportion of the blue light B that contributes to wavelength conversion and is converted into yellow fluorescence Y becomes relatively large, so the ratio of the amount of blue light to the amount of yellow light becomes small.

[0062] As described above, according to the light source device 30A of this embodiment, the ratio between the amount of yellow fluorescence Y and the amount of blue light B can be adjusted by replacing the first convex lens 451 and the second convex lens 452 of the incident angle adjustment optical system 45. This makes it possible to obtain white light LW with a desired color without reducing the overall amount of light. While this embodiment uses two convex lenses, using more convex lenses allows for more precise adjustment of the ratio between the amount of yellow fluorescence Y and the amount of blue light B. Furthermore, even if the white balance of the white light LW is disrupted due to deterioration over time of the LD constituting the second light source 82 or the LED constituting the first light source 41, deterioration over time of the phosphor of the wavelength conversion element 51, or the like, the light source device 30A of this embodiment can adjust the ratio between the amount of yellow fluorescence Y and the amount of blue light B to obtain white light with the original white balance.

[0063] The inventors performed a simulation to calculate the ratio of the amount of blue light to the amount of yellow light when the focal length of the convex lens is changed. As a result, it was confirmed that the ratio of the amount of blue light to the amount of yellow light can be significantly changed by gradually increasing the focal length (focal position) of the convex lens from the position of the second end face 51b of the wavelength conversion element 51 to the position of the first end face 51a. For example, under specific simulation conditions, when the focal position of the convex lens was aligned with the second end face 51b of the wavelength conversion element 51, the ratio of the amount of blue light to the amount of yellow light was approximately 1%, and when the focal position of the convex lens was aligned with the first end face 51a of the wavelength conversion element 51, the ratio of the amount of blue light to the amount of yellow light was approximately 80%. This means that when the focal position of the convex lens is set to the second end face 51b of the wavelength conversion element 51, most of the blue light is converted to yellow light and almost no component is emitted as blue light; on the other hand, when the focal position of the convex lens is set to the first end face 51a of the wavelength conversion element 51, approximately 80% of the blue light is emitted as blue light.

[0064] In the light source device 30A of this embodiment, the wavelength conversion element 51 has a first side surface 51c and a second side surface 51d facing opposite to each other, the light guiding section has a first light guiding section 71 arranged opposite to the first side surface 51c and a second light guiding section 72 arranged opposite to the second side surface 51d, and the first light source 41 has a third light source 43 that causes excitation light E to be incident on the wavelength conversion element 51 via the first light guiding section 71, and a fourth light source 44 that causes excitation light E to be incident on the wavelength conversion element 51 via the second light guiding section 72.

[0065] According to this configuration, the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 are in contact with the light-transmitting member 73, so that heat from the wavelength conversion element 51 is efficiently transferred to the light-transmitting member 73, and a temperature rise in the wavelength conversion element 51 is suppressed. This makes it possible to suppress a decrease in wavelength conversion efficiency that accompanies a temperature rise in the wavelength conversion element 51. Furthermore, because the excitation light E emitted from each of the third light source 43 and the fourth light source 44 is incident on the wavelength conversion element 51 from the two side surfaces 51c, 51d, it is possible to ensure the amount of excitation light E and the amount of yellow fluorescence Y.

[0066] The projector 10 of this embodiment includes a light source device 30A, light modulation devices 400R, 400G, and 400B that modulate the light emitted from the light source device 30A, and a projection optical device 600 that projects the light modulated by the light modulation devices 400R, 400G, and 400B. According to this configuration, since the light source device 30A emits white light LW, there is no need to prepare a light source device that emits blue light separately from a light source device that emits yellow fluorescent light, and a projector 10 with a highly efficient and simple configuration can be realized.

[0067] [Second embodiment] A second embodiment of the present invention will be described below with reference to FIG. The basic configuration of the light source device of the second embodiment is the same as that of the first embodiment, but the configuration of the incident angle adjusting optical system is different from that of the first embodiment, so a description of the basic configuration of the light source device will be omitted. 4 is a cross-sectional view of a light source device 30B of the second embodiment cut along the XY plane. In FIG. 4, components common to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0068] As shown in FIG. 4, the light source device 30B of this embodiment includes a first light source 41, a wavelength conversion element 51, a first light guiding section 71, a second light guiding section 72, a first optical layer 61, a second light source 82, a collimating optical system 83, an incident angle adjusting optical system 46, a second optical layer 62, and a reflective layer (not shown).

[0069] The incident angle adjustment optical system 46 has a convex lens 461. The convex lens 461 is movable along the optical axis direction (X-axis direction) of the convex lens 461. As a specific configuration, for example, a configuration can be adopted in which the convex lens 461 is supported on a guide rail extending in the optical axis direction, and the convex lens 461 is moved by sliding along the guide rail. However, the configuration is not limited to this. The other configurations of the light source device 30B are similar to those of the light source device 30A of the first embodiment.

[0070] In the incident angle adjustment optical system 46 of this embodiment, when the convex lens 461 is moved to the side farther from the collimating optical system 83 (toward the +X side), the incident angle of the blue light B with respect to the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 becomes relatively large, and therefore the blue light B is incident on an area relatively close to the first end surface 51a of the wavelength conversion element 51. At this time, the proportion of the blue light B that contributes to wavelength conversion and is converted into yellow fluorescence Y becomes relatively small, and therefore the ratio of the amount of blue light to the amount of yellow light becomes large.

[0071] Conversely to the above, when the convex lens 461 is moved to the side closer to the collimating optical system 83 (the -X side), the angle of incidence of the blue light B with respect to the first side surface 51c and the second side surface 51d of the wavelength conversion element 51 becomes relatively small, so that the blue light B is incident on an area relatively closer to the second end surface 51b of the wavelength conversion element 51. At this time, the proportion of the blue light B that contributes to wavelength conversion and is converted into yellow fluorescence Y becomes relatively large, so the ratio of the amount of blue light to the amount of yellow light becomes smaller.

[0072] (Effects of the second embodiment) In this embodiment, too, the ratio between the amount of yellow fluorescence Y and the amount of blue light B can be adjusted by moving the convex lens 461 of the incident angle adjustment optical system 46 along the optical axis, thereby achieving the same effect as in the first embodiment, that is, the desired white light LW can be obtained.

[0073] [Third embodiment] A third embodiment of the present invention will be described below with reference to FIGS. The basic configuration of the light source device of the second embodiment is the same as that of the first embodiment, but the configuration of the incident angle adjusting optical system is different from that of the first embodiment, so a description of the basic configuration of the light source device will be omitted. Fig. 5 is a diagram showing the operation of light source device 30C of the third embodiment, as viewed from the Z-axis direction. Fig. 6 is a diagram showing the operation of light source device 30C of the third embodiment, as viewed from the Y-axis direction. In Figs. 5 and 6, components common to those in the first embodiment are designated by the same reference numerals, and descriptions thereof will be omitted.

[0074] In the first and second embodiments, the convex lens constituting the incident angle adjustment optical system is a general convex lens whose focal length in the Y-axis direction is equal to that in the Z-axis direction. In contrast, in light source device 30C of this embodiment, convex lens 465 constituting the incident angle adjustment optical system is an anamorphic lens, as shown by the solid lines in FIGS. 5 and 6 . The radius of curvature of the lens surface of the anamorphic lens along the Y-axis direction is longer than the radius of curvature of the lens surface along the Z-axis direction. That is, the curvature of the lens surface of the anamorphic lens along the Y-axis direction is smaller than the curvature of the lens surface along the Z-axis direction. In other words, the focal length of the lens surface of the anamorphic lens along the Y-axis direction is longer than the focal length of the lens surface along the Z-axis direction. As described in the first embodiment, the major axis direction of the ellipse, which is the cross-sectional shape perpendicular to the optical axis of blue light B, is the Z-axis direction, and the minor axis direction of the ellipse is the Y-axis direction. Therefore, to rephrase the above relationship, the focal length of the anamorphic lens in the major axis direction of the cross-sectional shape perpendicular to the optical axis of the blue light B is shorter than the focal length of the anamorphic lens in the minor axis direction of the cross-sectional shape. The other configurations of the light source device 30C are similar to those of the light source device 30A of the first embodiment and the light source device 30B of the second embodiment.

[0075] (Effects of the third embodiment) In this embodiment, too, by replacing the convex lens 465 of the incident angle adjustment optical system or moving it along the optical axis, the ratio between the amount of yellow fluorescence Y and the amount of blue light B can be adjusted, thereby obtaining the desired white light LW, which is an effect similar to that of the first embodiment.

[0076] Furthermore, according to this embodiment, the following effects can be obtained. The inventors have found that in designing an actual light source device, ideal white light can be obtained by setting the focal position of the convex lens at the first end surface 51a of the wavelength conversion element 51 or at a position farther away from the first end surface 51a. In this case, as shown in Fig. 5, due to the relative dimensional relationship between the various members, when viewed from the direction of the major axis of the ellipse, which is the cross-sectional shape perpendicular to the optical axis of the blue light beams B1 and B2, the ends of the blue light beams B1 and B2 in the direction of the minor axis cannot enter the light-transmitting member 73, which may result in a loss of blue light B.

[0077] In this situation, if a convex lens whose focal length in the Z-axis direction is equal to its focal length in the Y-axis direction were used instead of an anamorphic lens, the result would be the state shown by dashed line B3 in FIG. 6 . That is, when viewed from the minor axis direction of the ellipse, which is the cross-sectional shape perpendicular to the optical axis of blue light ray B3, both ends of the blue light ray B3 in the major axis direction would not be able to enter the translucent member 73, resulting in even greater loss of blue light B. To solve this problem, as shown by the solid line in FIG. 6 , a convex lens 465 is used, which is an anamorphic lens whose focal length in the Z-axis direction is shorter than its focal length in the Y-axis direction. In this case, the ellipse, which is the cross-sectional shape perpendicular to the optical axis of blue light rays B1 and B2, is reduced in the major axis direction compared to the ellipse B3 obtained when a normal convex lens is used. This reduces the loss of blue light B at the second end surface 73b of the translucent member 73, thereby improving the utilization efficiency of blue light B.

[0078] [Fourth embodiment] A fourth embodiment of the present invention will be described below with reference to FIG. The basic configuration of the light source device of the fourth embodiment is the same as that of the first embodiment, but the configuration of the second light source is different from that of the first embodiment, so a description of the basic configuration of the light source device will be omitted. 7 is a cross-sectional view of a light source device 30D of the fourth embodiment cut along the XY plane. In Fig. 7, components common to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0079] As shown in FIG. 7, the light source device 30D of this embodiment includes a first light source 41, a wavelength conversion element 51, a first light guiding section 71, a second light guiding section 72, a first optical layer 61, a second light source 96, a collimating optical system 93, a light beam width reduction optical system 95, an incident angle adjustment optical system 45, a second optical layer 62, and a reflective layer (not shown).

[0080] The second light source 96 has a first light-emitting element 961, a second light-emitting element 962, a third light-emitting element 963, and a fourth light-emitting element 964. The four light-emitting elements are arranged in the following order from the -Y side to the +Y side: the first light-emitting element 961, the third light-emitting element 963, the fourth light-emitting element 964, and the second light-emitting element 962. The four light-emitting elements 961, 962, 963, and 964 are configured with the same LDs that emit blue light beams B1, B2, B3, and B4. However, the polarization directions of the blue light beams B1 and B3 emitted from the first light-emitting element 961 and the third light-emitting element 963 are different from the polarization directions of the blue light beams B2 and B4 emitted from the second light-emitting element 962 and the fourth light-emitting element 964. Specifically, the blue light beams B1 and B3 emitted from the first light-emitting element 961 and the third light-emitting element 963 are P-polarized light with respect to the polarization separation mirror of the light beam width reduction optical system 95, which will be described later. The blue light beams B2 and B4 emitted from the second light-emitting element 962 and the fourth light-emitting element 964 are S-polarized light with respect to the polarization separation mirror of the light beam width reduction optical system 95, which will be described later. Therefore, a half-wave plate (not shown) is provided on the light emission side of either the first light-emitting element 961 and the third light-emitting element 963, or the second light-emitting element 962 and the fourth light-emitting element 964.

[0081] The collimating optical system 93 is disposed on the light emission side of the second light source 96. The collimating optical system 93 includes a first collimating element 931, a second collimating element 932, a third collimating element 933, and a fourth collimating element 934. Each of the first collimating element 931, the second collimating element 932, the third collimating element 933, and the fourth collimating element 934 is composed of a collimator lens. The first collimating element 931 collimates the blue light ray B1 emitted from the first light-emitting element 961. The second collimating element 932 collimates the blue light ray B2 emitted from the second light-emitting element 962. The third collimating element 933 collimates the blue light ray B3 emitted from the third light-emitting element 963. The fourth collimating element 934 collimates the blue light ray B4 emitted from the fourth light-emitting element 964.

[0082] The light beam width reduction optical system 95 is disposed on the light exit side of the collimating optical system 93. The light beam width reduction optical system 95 has a first polarization separation mirror 951, a second polarization separation mirror 952, a first reflecting mirror 953, a second reflecting mirror 954, a third reflecting mirror 955, and a fourth reflecting mirror 956.

[0083] P-polarized blue light ray B1 emitted from first light-emitting element 961 is collimated by first parallelizing element 931, then passes through first polarization separation mirror 951 and travels toward the +X side. S-polarized blue light ray B4 emitted from fourth light-emitting element 964 is collimated by fourth parallelizing element 934, then reflected by first reflecting mirror 953 and travels toward first polarization separation mirror 951, where it is reflected by first polarization separation mirror 951 and combined with P-polarized blue light ray B1 emitted from first light-emitting element 961 and travels toward the +X side. P-polarized blue light ray B3 emitted from third light-emitting element 963 is collimated by third parallelizing element 933, then passes through second polarization separation mirror 952 and travels toward the +X side. S-polarized blue light ray B2 emitted from second light-emitting element 962 is collimated by second collimating element 932, reflected by second reflecting mirror 954, and travels toward second polarization separation mirror 952. It is then reflected by second polarization separation mirror 952 and combined with P-polarized blue light ray B3 emitted from third light-emitting element 963, and travels toward the +X side. The combined blue light of blue light ray B2 and blue light ray B3 is reflected by third reflecting mirror 955, and then reflected by fourth reflecting mirror 956, and travels toward the +X side. In this way, light beam width reduction optical system 95 reduces the beam width of blue light B, which includes blue light rays B1, B2, B3, and B4 emitted from four light-emitting elements 921, 922, 923, and 924. The other configurations of the light source device 30D are similar to those of the light source device 30A of the first embodiment.

[0084] (Effects of the fourth embodiment) In this embodiment, too, by replacing the first convex lens 451 and the second convex lens 452 of the incident angle adjustment optical system 45, the ratio between the amount of yellow fluorescence Y and the amount of blue light B can be adjusted, and the desired white light LW can be obtained, thereby achieving the same effect as in the first embodiment.

[0085] In the light source device 30D of the present embodiment, the number of light-emitting elements constituting the second light source 96 is increased compared to the first embodiment, and therefore the amount of blue light B emitted from the second light source 96 can be increased. However, as the number of light-emitting elements increases, the overall luminous flux width of the blue light B increases, making it difficult to cause the blue light B to be incident on the second end surface 73b of the translucent member 73 without causing loss of the blue light B. In contrast, in the light source device 30D of the present embodiment, the luminous flux width of the blue light B is reduced by the luminous flux width reduction optical system 95 disposed upstream of the translucent member 73, and therefore the blue light B can be incident on the second end surface 73b of the translucent member 73 without causing loss of the blue light B. As a result, the amount of white light LW can be increased.

[0086] [Fifth embodiment] Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. The basic configuration of the light source device of the fifth embodiment is the same as that of the first embodiment, but the configuration of the light guide section is different from that of the first embodiment, so a description of the basic configuration of the light source device will be omitted. Fig. 8 is a cross-sectional view of a light source device 30E of the fifth embodiment cut along the XY plane. In Fig. 8, components common to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0087] As shown in FIG. 8, the light source device 30E of this embodiment includes a first light source 41, a wavelength conversion element 51, a first light guiding section 75, a second light guiding section 76, a first optical layer 61, a second light source 82, a collimating optical system 83, an incident angle adjusting optical system 45, a second optical layer 62, and a reflective layer (not shown).

[0088] In the light source device 30A of the first embodiment, the first light guiding section 71 and the second light guiding section 72 are formed of a light-transmitting member 73. In contrast, in the light source device 30E of the present embodiment, the first light guiding section 75 and the second light guiding section 76 are formed of an air layer 77. That is, the first optical layer 61 and the wavelength conversion element 51 are disposed apart from each other, and air exists between the first optical layer 61 and the wavelength conversion element 51. Therefore, the yellow fluorescence Y converted by the wavelength conversion element 51 and the blue light B emitted from the second light source 82 are emitted from the region of the air layer 77 on the first end surface 51 a side. The other configurations of the light source device 30E are similar to those of the light source device 30A of the first embodiment.

[0089] (Effects of the fifth embodiment) In this embodiment, too, by replacing the first convex lens 451 and the second convex lens 452 of the incident angle adjustment optical system 45, the ratio between the amount of yellow fluorescence Y and the amount of blue light B can be adjusted, and the desired white light LW can be obtained, thereby achieving the same effect as in the first embodiment.

[0090] In this embodiment, the first light guiding section 75 and the second light guiding section 76 are formed with an air layer 77. This increases the difference in refractive index between the wavelength conversion element 51 and each light guiding section 75, 76 compared to when the first light guiding section and the second light guiding section are formed with a translucent material such as quartz. Therefore, the refraction angle of the fluorescence Y when it is emitted from the wavelength conversion element 51 to each light guiding section 75, 76 increases, and the fluorescence Y travels in a direction that forms a small angle with respect to the first side surface 51c and the second side surface 51d of the wavelength conversion element 51, i.e., a small angle with respect to the X-axis. Furthermore, because the regions of the first end surfaces 51a of each light guiding section 75, 76 are open to the external space and do not have a refractive index interface, the fluorescence Y that reaches the regions of the first end surfaces 51a of each light guiding section 75, 76 is emitted directly into the external space without reflection or refraction. As a result, the light source device 30E of this embodiment can improve the extraction efficiency of yellow fluorescence Y compared to the first embodiment.

[0091] [Sixth embodiment] A sixth embodiment of the present invention will be described below with reference to FIG. The basic configuration of the light source device of the sixth embodiment is the same as that of the first embodiment, but the arrangement of the wavelength conversion element and the light guide section is different from that of the first embodiment, so a description of the basic configuration of the light source device will be omitted. 9 is a cross-sectional view of a light source device 30F of the sixth embodiment cut along the XY plane. In Fig. 9, components common to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0092] As shown in Figure 9, the light source device 30F of this embodiment includes a first light source 41, a first wavelength conversion element 511, a second wavelength conversion element 512, a light guide section 70, a first optical layer 61, a second light source 82, a collimation optical system 83, an incident angle adjustment optical system 84, a second optical layer 62, and a reflective layer (not shown).

[0093] The light source device 30F of this embodiment includes two wavelength conversion elements: a first wavelength conversion element 511 and a second wavelength conversion element 512. The first wavelength conversion element 511 and the second wavelength conversion element 512 have the same configuration and are arranged spaced apart from each other in the Y-axis direction. The first wavelength conversion element 511 and the second wavelength conversion element 512 each convert the excitation light E emitted from the first light source 41 into yellow fluorescence Y. The excitation light E emitted from the third light source 43 is incident on the first wavelength conversion element 511. The excitation light E emitted from the fourth light source 44 is incident on the second wavelength conversion element 512.

[0094] The light guiding unit 70 is composed of a plate-shaped light-transmitting member 73 made of quartz or the like. The first wavelength conversion element 511 and the second wavelength conversion element 512 are bonded to two side surfaces 73c, 73d of the light-transmitting member 73 with an optical adhesive. The yellow fluorescence Y converted by the first wavelength conversion element 511 and the second wavelength conversion element 512 is emitted from each wavelength conversion element 511, 512, travels inside the light guiding unit 70, and is emitted to the outside from a first end surface 73a of the light guiding unit 70.

[0095] The incident angle adjustment optical system 84 has a first concave lens 841 and a second concave lens 842. As an example, a configuration in which the incident angle adjustment optical system 84 has two concave lenses is shown, but the number of concave lenses is not particularly limited and may be three or more. The curvature of the lens surface of the first concave lens 841 and the curvature of the lens surface of the second concave lens 842 are different from each other. The first concave lens 841 and the second concave lens 842 are interchangeable with each other. Note that the incident angle adjustment optical system may have a configuration in which one concave lens is movable in the optical axis direction, as in the second embodiment. The other configurations of the light source device 30F are similar to those of the light source device 30A of the first embodiment.

[0096] In this embodiment, the blue light B collimated by the collimating optical system 83 is diverged by the first concave lens 841 of the incident angle adjusting optical system 84. At this time, since the blue light B is composed of blue light rays B1 and B2, each of the blue light rays B1 and B2 is refracted by the first concave lens 841 in a direction away from the optical axis AX1 as each of the blue light rays B1 and B2 travels through the light-transmitting member 73.

[0097] As a result, blue light ray B1 incident on the light-transmitting member 73 of the light-guiding unit 70 from the second end face 73b travels obliquely inside the light-transmitting member 73 and enters the second wavelength conversion element 512. Similarly, blue light ray B2 incident on the light-transmitting member 73 from the second end face 73b travels obliquely inside the light-transmitting member 73 and enters the first wavelength conversion element 511. A portion of the blue light rays B1 and B2 incident on each wavelength conversion element 511 and 512 contributes to wavelength conversion as excitation light, is converted into yellow fluorescence Y, travels inside the light-transmitting member 73, and is emitted to the outside from the first end face 73a of the light-transmitting member 73. In addition, another portion of the blue light rays B1 and B2 incident on the wavelength conversion element 51 does not contribute to wavelength conversion and is emitted to the outside from the first end face 73a of the light-transmitting member 73 as blue light B.

[0098] The curvature of the second concave lens 842 is assumed to be greater than that of the first concave lens 841. In this case, by replacing the first concave lens 841 with the second concave lens 842, the blue light rays B1 and B2 can be incident at positions closer to the second end faces 511b and 512b of the wavelength conversion elements 511 and 512. Therefore, by using the second concave lens 842, it is possible to relatively increase the proportion of blue light B that contributes to wavelength conversion as excitation light. Conversely, by using the first concave lens 841, it is possible to relatively increase the proportion of blue light B that is emitted without contributing to wavelength conversion.

[0099] (Effects of the sixth embodiment) In this embodiment, too, by replacing the first concave lens 841 and the second concave lens 842 of the incident angle adjustment optical system 84, the ratio between the amount of yellow fluorescence Y and the amount of blue light B can be adjusted, and the desired white light LW can be obtained, thereby achieving the same effect as in the first embodiment.

[0100] [Seventh embodiment] The seventh embodiment of the present invention will be described below with reference to FIG. The basic configuration of the light source device of the seventh embodiment is the same as that of the first embodiment, but differs from the first embodiment in that a light diffusion element is added, so a description of the basic configuration of the light source device will be omitted. Fig. 10 is a cross-sectional view of a light source device 30G of the seventh embodiment cut along the XY plane. In Fig. 10, components common to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0101] As shown in Figure 10, the light source device 30G of this embodiment includes a first light source 41, a wavelength conversion element 51, a first light guiding section 71, a second light guiding section 72, a first optical layer 61, a second light source 82, a collimating optical system 83, an incident angle adjustment optical system 45, a second optical layer 62, a light diffusing element 89, and a reflective layer (not shown).

[0102] The light diffusion element 89 is disposed on the first end surface 73a of the light-transmitting member 73 that constitutes the first light guide section 71 and the second light guide section 72. Specifically, the light diffusion element 89 is bonded to the first end surface 73a of the light-transmitting member 73 with an optical adhesive. The light diffusion element 89 may be made of frosted glass having a random uneven structure. Alternatively, the light diffusion element 89 may be made of a microlens array diffuser plate having a regular uneven structure. The light diffusion element 89 diffuses blue light B emitted from the first end surface 73a of the light-transmitting member 73. The light diffusion element 89 of this embodiment corresponds to the light diffusion portion in the claims. Note that the light diffusion portion may be formed by directly unevenly processing the first end surface 73a of the light-transmitting member 73. The other configurations of the light source device 30G are similar to those of the light source device 30A of the first embodiment.

[0103] (Effects of the Seventh Embodiment) In this embodiment, too, by replacing the first convex lens 451 and the second convex lens 452 of the incident angle adjustment optical system 45, the ratio between the amount of yellow fluorescence Y and the amount of blue light B can be adjusted, and the desired white light LW can be obtained, thereby achieving the same effect as in the first embodiment.

[0104] The blue light beams B1 and B2 propagating through the light guides 71 and 72 are collimated light beams from the LD point light source, and therefore have a narrow divergence angle and a narrow peak when emitted from the first end surface 73a of the translucent member 73. On the other hand, the fluorescence Y emitted from the wavelength conversion element 51 has a wide divergence angle and a Lambertian luminous intensity distribution. Therefore, the white light LW obtained by combining the blue light B and the yellow fluorescence Y may cause color unevenness in the downstream optical system due to the difference in the luminous intensity distribution between the blue light and the yellow light. In contrast, the light source device 30G of this embodiment includes a light diffusion element 89 on the first end surface 73a of the translucent member 73. The blue light B is diffused by the light diffusion element 89 and emitted to the outside. This allows the luminous intensity distribution of the blue light B to be closer to that of the yellow fluorescence Y, thereby reducing color unevenness in the downstream optical system.

[0105] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the first light source is disposed facing both the first side surface and the second side surface of the wavelength conversion element, and excitation light is incident from both the first side surface and the second side surface. However, instead of this configuration, the first light source may be disposed facing only one of the first side surface and the second side surface of the wavelength conversion element, and excitation light may be incident from one side surface. In this case, a heat conductive member such as a housing may be brought into contact with the side surface on which the excitation light is not incident. This allows heat from the wavelength conversion element to be efficiently dissipated.

[0106] In addition, the specific descriptions of the shape, number, arrangement, materials, etc. of each component of the light source device and the projector are not limited to the above-described embodiments and can be modified as appropriate. Furthermore, in the above-described embodiments, an example was shown in which the light source device according to the present invention was mounted in a projector using a liquid crystal panel, but this is not limiting. The light source device according to the present invention may also be applied to a projector using a digital micromirror device as a light modulation device. Furthermore, the projector does not need to have multiple light modulation devices, and may have only one light modulation device.

[0107] In the above embodiment, the light source device of the present invention is applied to a projector, but the present invention is not limited to this. The light source device of the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

[0108] Summary of this disclosure A summary of this disclosure is provided below.

[0109] (Appendix 1) a first light source that emits first light in a first wavelength band; a second light source that emits second light in a second wavelength band; a wavelength conversion element that converts the first light and the second light into third light of a third wavelength band different from the first wavelength band and the second wavelength band; a first optical layer disposed between the first light source and the wavelength conversion element, the first optical layer transmitting the first light and reflecting the third light; a light guiding section disposed between the first optical layer and the wavelength conversion element and guiding each of the first light, the second light, and the third light; an incident angle adjusting optical system disposed between the second light source and the light guiding unit, which adjusts an incident angle of the second light with respect to the wavelength conversion element; a second optical layer disposed between the incident angle adjusting optical system and the light guiding unit, the second optical layer transmitting the second light and reflecting the third light; Equipped with the wavelength conversion element has a first surface and a second surface facing opposite to each other, and a third surface intersecting the first surface and the second surface; the first light emitted from the first light source passes through the first optical layer and the light guiding portion and enters the wavelength conversion element from the third surface, the third light converted by the wavelength conversion element travels through the light guiding section and is emitted from a region on the first surface side of the light guiding section, the second light emitted from the second light source has an incident angle adjusted by the incident angle adjusting optical system, and is incident on a region on the second surface side of the light guiding unit through the second optical layer, a light source device in which a portion of the second light incident on the light guiding section is incident on the wavelength conversion element from the third surface and converted into the third light, and another portion of the second light incident on the light guiding section is emitted from an area on the first surface side of the light guiding section.

[0110] According to the configuration of Supplementary Note 1, by adjusting the incident angle of the second light with respect to the wavelength conversion element using the incident angle adjusting optical system, it is possible to adjust the balance between the amount of the third light converted by the wavelength conversion element and the amount of the second light emitted without being converted by the wavelength conversion element, thereby obtaining combined light having a desired color.

[0111] (Appendix 2) the light guide portion has a light-transmitting member that transmits the first light, the second light, and the third light, 2. The light source device according to claim 1, wherein the second light and the third light are emitted from an end face of the light-transmitting member on the first surface side.

[0112] According to the configuration of Supplementary Note 2, the combined light of the second light and the third light can be extracted to the outside through the light-transmitting member constituting the light-guiding section. In addition, since the heat of the wavelength conversion element is transferred to the light-transmitting member, it is possible to suppress a temperature rise of the wavelength conversion element and a decrease in wavelength conversion efficiency.

[0113] (Appendix 3) the light guide portion has an air layer, 2. The light source device according to claim 1, wherein the second light and the third light are emitted from a region of the air layer on the first surface side.

[0114] According to the configuration of Supplementary Note 3, the combined light of the second light and the third light can be extracted to the outside through the air layer that constitutes the light-guiding section. In addition, since the area on the first surface side of the air layer is open to the outside space, there is no refraction or reflection at the end face, and the extraction efficiency of the combined light can be increased.

[0115] (Appendix 4) the third surface of the wavelength conversion element has a first side surface and a second side surface facing in opposite directions, the light guiding section includes a first light guiding section disposed opposite the first side surface and a second light guiding section disposed opposite the second side surface, The light source device according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the first light source includes a third light source that causes the first light to be incident on the wavelength conversion element via the first light guiding section, and a fourth light source that causes the first light to be incident on the wavelength conversion element via the second light guiding section.

[0116] According to the configuration of Supplementary Note 4, the amount of the first light incident on the wavelength conversion element can be increased, and therefore the amount of the third light can be increased.

[0117] (Appendix 5) the incident angle adjusting optical system includes a first convex lens and a second convex lens having different focal lengths; 5. The light source device according to claim 4, wherein the first convex lens and the second convex lens are interchangeable with each other.

[0118] According to the configuration of Supplementary Note 5, by exchanging the first convex lens and the second convex lens with each other, the incident angle of the second light with respect to the wavelength conversion element can be easily adjusted.

[0119] (Appendix 6) 6. The light source device according to claim 5, wherein each of the first convex lens and the second convex lens is an anamorphic lens.

[0120] According to the configuration of Supplementary Note 6, the reduction ratio of the second light in a specific direction can be made smaller than the reduction ratio of the second light in other directions, thereby reducing the loss of the second light at the incident position of the light-guiding section and increasing the utilization efficiency of the second light.

[0121] (Appendix 7) the incident angle adjusting optical system has a convex lens, 5. The light source device according to claim 4, wherein the convex lens is movable along an optical axis direction of the convex lens.

[0122] According to the configuration of Supplementary Note 7, the incident angle of the second light with respect to the wavelength conversion element can be easily adjusted by moving the convex lens in the optical axis direction.

[0123] (Appendix 8) 8. The light source device according to claim 7, wherein the convex lens is an anamorphic lens.

[0124] According to the configuration of Appendix 8, the reduction ratio of the second light in a specific direction can be made smaller than the reduction ratio of the second light in other directions, thereby reducing the loss of the second light at the incident position of the light-guiding section and increasing the utilization efficiency of the second light.

[0125] (Appendix 9) 9. The light source device of claim 6, wherein a focal length of the anamorphic lens in a major axis direction of a cross-sectional shape perpendicular to the optical axis of the second light is shorter than a focal length of the anamorphic lens in a minor axis direction of the cross-sectional shape.

[0126] According to the configuration of Supplementary Note 9, the reduction ratio of the second light in the long axis direction of the cross-sectional shape can be made smaller than the reduction ratio of the second light in the short axis direction, thereby effectively reducing the loss of the second light at the incident position of the light-guiding section.

[0127] (Appendix 10) the wavelength conversion element includes a first wavelength conversion element that converts the first light and the second light into the third light, and a second wavelength conversion element that converts the first light and the second light into the third light, the light guiding portion is disposed between the first wavelength conversion element and the second wavelength conversion element, The light source device according to any one of claims 1 to 3, wherein the first light source includes a third light source that causes the first light to be incident on the first wavelength conversion element and a fourth light source that causes the first light to be incident on the second wavelength conversion element.

[0128] According to the configuration of Supplementary Note 10, the amount of the first light incident on the wavelength conversion element can be increased, and therefore the amount of the third light can be increased.

[0129] (Appendix 11) the incident angle adjusting optical system includes a first concave lens and a second concave lens having lens surfaces with different curvatures, 11. The light source device according to claim 10, wherein the first concave lens and the second concave lens are interchangeable with each other.

[0130] According to the configuration of Supplementary Note 11, by exchanging the first concave lens and the second concave lens with each other, the incident angle of the second light with respect to the wavelength conversion element can be easily adjusted.

[0131] (Appendix 12) the incident angle adjusting optical system has a concave lens, 11. The light source device according to claim 10, wherein the concave lens is movable along an optical axis direction of the concave lens.

[0132] According to the configuration of Supplementary Note 12, the incident angle of the second light with respect to the wavelength conversion element can be easily adjusted by moving the concave lens in the optical axis direction.

[0133] (Appendix 13) the first light is blue light; the second light is blue light; 13. The light source device according to any one of claims 1 to 12, wherein the third light is yellow light containing a green light component and a red light component.

[0134] According to the configuration of Supplementary Note 13, a light source device capable of efficiently emitting white light can be realized.

[0135] (Appendix 14) 14. The light source device according to claim 1, wherein the second light source has a laser diode that emits the second light.

[0136] According to the configuration of Supplementary Note 14, by configuring the light emitting element with a laser diode, which is a point light source, it is possible to obtain parallel light using a collimating optical system.

[0137] (Appendix 15) 15. The light source device according to claim 14, further comprising a light diffusion section arranged in a region on the first surface side of the light guide section and diffusing the second light.

[0138] According to the configuration of Supplementary Note 15, even when a laser diode is used, the light distribution of the second light can be widened to approach the light distribution of the third light, thereby reducing color unevenness in the downstream optical system.

[0139] (Appendix 16) 16. The light source device according to claim 14, wherein the first light source has a light emitting diode that emits the first light.

[0140] According to the configuration of Supplementary Note 16, it is possible to reduce the cost of the light source device and improve the light emission efficiency.

[0141] (Appendix 17) the second light source includes a first light-emitting element that emits the second light and a second light-emitting element that emits the second light, The light source device according to any one of claims 1 to 16, further comprising a beam width reduction optical system that reduces the width of a beam including the second light emitted from the first light-emitting element and the second light emitted from the second light-emitting element.

[0142] According to the configuration of Supplementary Note 17, by reducing the beam width of the second light using the beam width reduction optical system, the amount of light of the second light can be increased while suppressing loss, and the overall amount of light of the combined light of the second light and the third light can be increased.

[0143] (Appendix 18) A light source device according to any one of Supplementary Note 1 to Supplementary Note 17; a light modulation device that modulates the light emitted from the light source device; a projection optical device that projects the light modulated by the light modulation device; A projector equipped with

[0144] According to the configuration of Appendix 18, the light source device emits a combined light that combines the second light and the third light, so only one light source device is required, making it possible to realize a projector that is highly efficient and has a simple configuration. [Explanation of symbols]

[0145] 10...Projector, 30A, 30B, 30C, 30D, 30E, 30F, 30G...Light source device, 41...First light source, 82, 96...Second light source, 43...Third light source, 44...Fourth light source, 45, 46, 84...Incident angle adjustment optical system, 51...Wavelength conversion element, 51a...First end face (first surface), 51b...Second end face (second surface), 51c...First side face (third surface), 51d...Second side face (third surface), 61...First optical layer, 62...Second optical layer, 70...Light guiding section, 71, 75...First light guiding section, 72, 76...Second light guiding section, 73... Light-transmitting member, 77...air layer, 89...light diffusion element (light diffusion section), 95...light beam width reduction optical system, 451...first convex lens, 452...second convex lens, 461...convex lens, 511...first wavelength conversion element, 512...second wavelength conversion element, 821, 961...first light-emitting element, 822, 962...second light-emitting element, 841...first concave lens, 842...second concave lens, 400B, 400G, 400R...light modulation device, 600...projection optical device, E...excitation light (first light), B...blue light (second light), Y...yellow fluorescence (third light).

Claims

1. a first light source that emits first light in a first wavelength band; a second light source that emits second light in a second wavelength band; a wavelength conversion element that converts the first light and the second light into third light of a third wavelength band different from the first wavelength band and the second wavelength band; a first optical layer disposed between the first light source and the wavelength conversion element, the first optical layer transmitting the first light and reflecting the third light; a light guiding portion disposed between the first optical layer and the wavelength conversion element and configured to guide each of the first light, the second light, and the third light; an incident angle adjusting optical system disposed between the second light source and the light guiding unit, which adjusts an incident angle of the second light with respect to the wavelength conversion element; a second optical layer disposed between the incident angle adjusting optical system and the light guiding unit, the second optical layer transmitting the second light and reflecting the third light; Equipped with the wavelength conversion element has a first surface and a second surface facing opposite to each other, and a third surface intersecting the first surface and the second surface; the first light emitted from the first light source passes through the first optical layer and the light guiding portion and is incident on the wavelength conversion element from the third surface, the third light converted by the wavelength conversion element travels through the light guiding portion and is emitted from a region on the first surface side of the light guiding portion, the incident angle of the second light emitted from the second light source is adjusted by the incident angle adjusting optical system, and the second light is incident on a region of the second surface side of the light guiding unit through the second optical layer, a light source device in which a portion of the second light incident on the light guiding section is incident on the wavelength conversion element from the third surface and converted into the third light, and another portion of the second light incident on the light guiding section is emitted from an area on the first surface side of the light guiding section.

2. the light guide portion has a light-transmitting member that transmits the first light, the second light, and the third light, The light source device according to claim 1 , wherein the second light and the third light are emitted from an end face of the light-transmitting member on the first surface side.

3. the light guide portion has an air layer, The light source device according to claim 1 , wherein the second light and the third light are emitted from a region of the air layer on the first surface side.

4. the third surface of the wavelength conversion element has a first side surface and a second side surface facing opposite to each other, the light guiding section includes a first light guiding section disposed opposite the first side surface and a second light guiding section disposed opposite the second side surface, 2. The light source device according to claim 1, wherein the first light source includes a third light source that causes the first light to be incident on the wavelength conversion element via the first light guiding section, and a fourth light source that causes the first light to be incident on the wavelength conversion element via the second light guiding section.

5. the incident angle adjusting optical system includes a first convex lens and a second convex lens having different focal lengths; The light source device according to claim 4 , wherein the first convex lens and the second convex lens are interchangeable with each other.

6. The light source device according to claim 5 , wherein each of the first convex lens and the second convex lens is an anamorphic lens.

7. the incident angle adjusting optical system has a convex lens, The light source device according to claim 4 , wherein the convex lens is movable along an optical axis direction of the convex lens.

8. The light source device according to claim 7 , wherein the convex lens is an anamorphic lens.

9. 9. The light source device according to claim 6, wherein a focal length of the anamorphic lens in a major axis direction of a cross-sectional shape perpendicular to the optical axis of the second light is shorter than a focal length of the anamorphic lens in a minor axis direction of the cross-sectional shape.

10. the wavelength conversion element includes a first wavelength conversion element that converts the first light and the second light into the third light, and a second wavelength conversion element that converts the first light and the second light into the third light, the light guiding portion is disposed between the first wavelength conversion element and the second wavelength conversion element, 4. The light source device according to claim 1, wherein the first light source includes a third light source that causes the first light to be incident on the first wavelength conversion element, and a fourth light source that causes the first light to be incident on the second wavelength conversion element.

11. the incident angle adjusting optical system includes a first concave lens and a second concave lens having lens surfaces with different curvatures; The light source device according to claim 10 , wherein the first concave lens and the second concave lens are interchangeable with each other.

12. the incident angle adjusting optical system has a concave lens, The light source device according to claim 10 , wherein the concave lens is movable along an optical axis direction of the concave lens.

13. the first light is blue light, the second light is blue light, The light source device according to claim 1 , wherein the third light is yellow light containing a green light component and a red light component.

14. The light source device according to claim 1 , wherein the second light source has a laser diode that emits the second light.

15. The light source device according to claim 14 , further comprising a light diffusion section arranged in a region on the first surface side of the light guide section, the light diffusion section diffusing the second light.

16. 16. The light source device according to claim 14, wherein the first light source has a light emitting diode that emits the first light.

17. the second light source includes a first light-emitting element that emits the second light and a second light-emitting element that emits the second light, 4. The light source device according to claim 1, further comprising a beam width reduction optical system that reduces a width of a beam including the second light emitted from the first light-emitting element and the second light emitted from the second light-emitting element.

18. The light source device according to any one of claims 1 to 3; a light modulation device that modulates the light emitted from the light source device; a projection optical device that projects the light modulated by the light modulation device; A projector equipped with

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