Light source device and projector

Abstract

A light source device and a projector. The light source device includes: a first light source that emits first light; a wavelength conversion element that converts the first light into second light; a first optical member that transmits the first light and reflects the second light; a first light guide part for guiding the second light; a first reflection member that reflects the first light and the second light; and a support member that supports the wavelength conversion element. The wavelength conversion element has a first surface on which the first light is incident, a second surface and a third surface that intersect the first surface and face opposite sides to each other, and a fourth surface and a fifth surface that intersect the first surface, the second surface, and the third surface and face opposite sides to each other. The first reflection member is disposed on the second surface side of the wavelength conversion element and the first light guide portion, the second light is emitted from the third surface side of the first light guide portion, and the support member has a first support portion that supports the fourth surface and a second support portion that supports the fifth surface. The first optical member covers a side of the first light guide portion disposed between the first support portion and the second support portion opposite to the wavelength conversion element.

Description

Technical Field

[0001] This invention relates to light source devices and projectors. Background Technology

[0002] As a light source device for a projector, a light source device utilizing fluorescence emitted from a phosphor when excitation light emitted from a light-emitting element is irradiated by the phosphor is proposed. Patent Document 1 discloses a light source device having a flat wavelength conversion member including a phosphor and a light-emitting diode emitting excitation light. In this light source device, excitation light is incident from the incident surface with a large area among the multiple surfaces of the wavelength conversion member, and fluorescence is emitted from the emitting surface with a small area.

[0003] Patent Document 1: International Publication No. 2006 / 054203

[0004] In the light source device of Patent Document 1, fluorescence generated inside the wavelength conversion component propagates within the wavelength conversion component through total internal reflection at the interface between the surface of the wavelength conversion component and the air layer, and is emitted from the emission surface. However, the component of the fluorescence that is incident at an angle less than the critical angle at the interface does not undergo total internal reflection at the interface, and therefore leaks to the outside from the interface before reaching the emission surface. Therefore, there is a problem of reduced fluorescence utilization efficiency. Summary of the Invention

[0005] To address the aforementioned issues, one embodiment of the present invention provides a light source device comprising: a first light source emitting first light in a first wavelength band; a wavelength conversion element converting the first light into second light in a second wavelength band different from the first wavelength band; a first optical component disposed between the first light source and the wavelength conversion element, transmitting the first light and reflecting the second light; a first light guide disposed between the wavelength conversion element and the first optical component, guiding the second light converted by the wavelength conversion element; a first reflective component reflecting the first light and the second light; and a support component supporting the wavelength conversion element, the wavelength conversion element having: a first surface onto which the first light is incident via the first optical component and the first light guide; a second surface and a third surface intersecting with the first surface. The first reflective element is disposed in the region of the second surface of the wavelength conversion element and the region of the second surface of the first light guide. The second light converted by the wavelength conversion element travels in the first light guide and exits from the region of the third surface of the first light guide. The support member has: a first support portion that supports the fourth surface of the wavelength conversion element; and a second support portion that supports the fifth surface of the wavelength conversion element. The first optical element abuts against the first support portion and the second support portion, covering the side of the first light guide disposed between the first support portion and the second support portion opposite to the wavelength conversion element.

[0006] One aspect of the present invention provides a projector comprising: a light source device according to one aspect of the present invention; a light modulation device for modulating light emitted from the light source device; and a projection optics device for projecting light modulated by the light modulation device. Attached Figure Description

[0007] Figure 1 This is a schematic structural diagram of the projector according to the first embodiment.

[0008] Figure 2 This is a side sectional view showing the general structure of the light source device.

[0009] Figure 3 It is along Figure 2 A cross-sectional view along line III-III.

[0010] Figure 4 This is a plan view of the light source device viewed from the +X side to the -X side.

[0011] Figure 5 This is a cross-sectional structural diagram of the light source device according to the second embodiment.

[0012] Label Explanation

[0013] 1 Projector; 30A, 30B Light Source Devices; 4B, 4G, 4R Light Modulation Devices; 6 Projection Optical Devices; 31 Frame; 31K Outlet; 41 First Light Source; 42 Second Light Source; 51, 52 Wavelength Conversion Elements; 51a, 52a Surfaces (First Surface); 51c, 52c First End Faces (Second Surface); 51d, 52d Second End Faces (Third Surface); 51e, 52e First Side Faces (Fourth Surface); 51f, 52f Second Side Faces (Fifth Surface); 55 First Optical Component; 56 Second Optical Component; 71 First Light Guide ; 72 Second light guide part; 80 Support member; 81 First reflective member; 82 Second reflective member; 83 Third reflective member; 88 Pressing member; 711 First light-transmitting member; 551a, 551b, 561a, 561b surfaces; 551 First transparent substrate; 552 First optical layer; 711d, 721d end faces; 712, 722 Air layers; 713 Light-transmitting adhesive; 801 First support part; 802 Second support part; E Excitation light (first light); Y, Y0, Y1, Y2, Y3, Y4 fluorescence (second light). Detailed Implementation

[0014] (First Embodiment)

[0015] Hereinafter, the first embodiment of the present invention will be described with reference to the accompanying drawings.

[0016] The projector in this embodiment is an example of a projector that uses a liquid crystal panel as a light modulation device.

[0017] In the following figures, to facilitate observation of the constituent elements, the scale of the dimensions is sometimes changed according to the constituent elements.

[0018] Figure 1 This is a schematic structural diagram of the projector 1 according to this embodiment.

[0019] like Figure 1 As shown, the projector 1 of this embodiment is a projection-type image display device that displays color images on a screen SCR, which serves as the projection surface. The projector 1 has three light modulation devices corresponding to each color of light: red light LR, green light LG, and blue light LB.

[0020] The projector 1 has a first illumination device 11, a second illumination device 12, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a light combining element 5, and a projection optical device 6.

[0021] The first illumination device 11 emits yellow illumination light WL toward the color separation optical system 3. The second illumination device 12 emits blue light LB toward the light modulation device 4B. The detailed structure of the first illumination device 11 and the second illumination device 12 will be described later.

[0022] The following explanation uses an XYZ orthogonal coordinate system as needed. The Z-axis is the axis along the vertical direction of the projector 1. The X-axis is the axis parallel to the optical axis AX1 of the first illumination device 11 and the optical axis AX2 of the second illumination device 12. The Y-axis is the axis orthogonal to both the X-axis and the Z-axis. The optical axis AX1 of the first illumination device 11 is the central axis of the fluorescence Y emitted from the first illumination device 11. The optical axis AX2 of the second illumination device 12 is the central axis of the blue light LB emitted from the second illumination device 12. One of the two directions along the X-axis is called the +X direction, and its opposite is called the -X direction; one of the two directions along the Y-axis is called the +Y direction, and its opposite is called the -Y direction; one of the two directions along the Z-axis is called the +Z direction, and its opposite is called the -Z direction. Alternatively, the two directions along the X-axis are collectively referred to as the X-axis direction, the two directions along the Y-axis are collectively referred to as the Y-axis direction, and the two directions along the Z-axis are collectively referred to as the Z-axis direction.

[0023] The color separation optical system 3 separates the yellow illumination light WL emitted from the first illumination device 11 into red light LR and green light LG. The color separation optical system 3 has a dichroic mirror 7, a first reflecting mirror 8a, and a second reflecting mirror 8b.

[0024] Dichroic mirror 7 separates the illumination light WL into red light LR and green light LG. Dichroic mirror 7 transmits red light LR and reflects green light LG. A second reflector 8b is positioned in the optical path of the green light LG. The second reflector 8b reflects the green light LG reflected by dichroic mirror 7 towards the optical modulation device 4G. A first reflector 8a is positioned in the optical path of the red light LR. The first reflector 8a reflects the red light LR that has passed through dichroic mirror 7 towards the optical modulation device 4R.

[0025] On the other hand, the blue light LB emitted from the second lighting device 12 is reflected by the reflector 9 toward the light modulation device 4B.

[0026] The structure of the second lighting device 12 will be described below.

[0027] The second lighting device 12 includes a light source 44, a converging lens 45, a diffuser plate 46, a rod lens 47, and a relay lens 48. The light source 44 is composed of at least one semiconductor laser. The light source 44 emits blue light LB composed of laser light. In addition, the light source 44 is not limited to a semiconductor laser, but may also be composed of an LED that emits blue light.

[0028] The converging lens 45 is a convex lens. The converging lens 45 causes the blue light LB emitted from the light source 44 to be incident on the diffuser plate 46 in a substantially convergent state. The diffuser plate 46 diffuses the blue light LB emitted from the converging lens 45 with a predetermined diffusion degree, generating blue light LB having a substantially uniform light distribution distribution similar to the illumination light WL emitted from the first illumination device 11. For example, frosted glass made of optical glass can be used as the diffuser plate 46.

[0029] Blue light LB, diffused by diffuser plate 46, is incident on rod lens 47. Rod lens 47 has a prismatic shape extending along the optical axis AX2 of the second illumination device 12. Rod lens 47 has a light incident end face 47a at one end and a light emitting end face 47b at the other end. Diffuser plate 46 is fixed to light incident end face 47a of rod lens 47 by optical adhesive (not shown). Preferably, the refractive index of diffuser plate 46 is as similar as possible to the refractive index of rod lens 47.

[0030] Blue light LB undergoes total internal reflection and propagates inside the rod lens 47, thus exiting from the light exiting end face 47b in a state with improved uniformity of illuminance distribution. The blue light LB exiting from the rod lens 47 is incident on the relay lens 48. The relay lens 48 causes the blue light LB, with improved uniformity of illuminance distribution after passing through the rod lens 47, to be incident on the reflecting mirror 9.

[0031] The shape of the light-emitting end face 47b of the rod lens 47 is rectangular, roughly similar in shape to the image-forming area of ​​the light modulation device 4B. Thus, the blue light LB emitted from the rod lens 47 is efficiently incident on the image-forming area of ​​the light modulation device 4B.

[0032] Optical modulation device 4R modulates the red light LR according to the image information to form an image light corresponding to the red light LR. Optical modulation device 4G modulates the green light LG according to the image information to form an image light corresponding to the green light LG. Optical modulation device 4B modulates the blue light LB according to the image information to form an image light corresponding to the blue light LB.

[0033] The light modulation devices 4R, 4G, and 4B each use a transmissive liquid crystal panel, for example. Furthermore, polarizing plates (not shown) are disposed on the incident and emission sides of the liquid crystal panel. The polarizing plates allow only linearly polarized light of a specific direction to pass through.

[0034] A field lens 10R is disposed on the incident side of the optical modulation device 4R. A field lens 10G is disposed on the incident side of the optical modulation device 4G. A field lens 10B is disposed on the incident side of the optical modulation device 4B. The field lens 10R parallelizes the principal ray of the red light LR incident on the optical modulation device 4R. The field lens 10G parallelizes the principal ray of the green light LG incident on the optical modulation device 4G. The field lens 10B parallelizes the principal ray of the blue light LB incident on the optical modulation device 4B.

[0035] The light combining element 5 combines the image light corresponding to the red light LR, green light LG, and blue light LB by incident on the image light emitted from the light modulation devices 4R, 4G, and 4B, and then emits the combined image light toward the projection optical device 6. The light combining element 5 may be, for example, a cross-shaped dichroic prism.

[0036] The projection optics 6 consists of multiple projection lenses. The projection optics 6 magnifies and projects the image light synthesized by the light-combining element 5 toward the SCR screen. Thus, a color image is displayed on the SCR screen.

[0037] Next, the structure of the first lighting device 11 will be described.

[0038] The first illumination device 11 includes a light source device 30A, an integrating optical system 90, a polarization conversion element 93, and an overlapping optical system 94.

[0039] Figure 2 This is a side sectional view showing the schematic structure of the light source device 30A of this embodiment. Figure 3 It is along Figure 2 A cross-sectional view along line III-III.

[0040] like Figure 2 As shown, the light source device 30A of this embodiment includes a frame 31, a first light source 41, a second light source 42, a wavelength conversion element 51, a first optical component 55, a second optical component 56, a first light guide 71, a second light guide 72, a support member 80, a pressing member 88, a first reflective member 81, a second reflective member 82, and a third reflective member 83.

[0041] The frame 31 constitutes the outer casing of the light source device 30A. The frame 31 houses the first light source 41, the second light source 42, the wavelength conversion element 51, the first optical component 55, the first reflective component 81, the second reflective component 82, the third reflective component 83, the second optical component 56, the first light guide 71, the second light guide 72, and the support component 80. The frame 31 is composed of a base plate 32 and a cover 33.

[0042] The frame 31 has an outlet 31K, which is used to extract the yellow fluorescent Y emitted from the wavelength conversion element 51, the first light guide 71, and the second light guide 72 as illumination light WL to the outside. The outlet 31K is an opening divided by the opening 33K provided in the second side wall portion 33d of the cover 33 (described later) and a part of the frame portion 32b of the bottom plate portion 32. In addition, the structure of the outlet 31K is not particularly limited, and the outlet 31K may also adopt a structure in which the frame 31 is sealed by a cover made of a light-transmitting member.

[0043] The frame 31 is constructed by arranging the base plate 32 and the side walls of the cover 33 together in a mating manner. The cover 33 and the base plate 32 are fixed to each other by fasteners such as adhesives or screws (not shown). In this way, in the light source device 30A, the structural elements of the first light source 41, the second light source 42, the wavelength conversion element 51, the first optical component 55, the first reflective component 81, the second reflective component 82, the third reflective component 83, the second optical component 56, the first light guide 71, the second light guide 72, and the support component 80 are housed in the space surrounded by the frame 31. As a result, it is possible to suppress the adhesion of foreign objects such as dust to the above-mentioned structural elements.

[0044] The bottom plate 32 has a generally plate-like shape. The cover 33 has a box shape with one side open, and has a top wall 33a, a first side wall 33c, a second side wall 33d, a third side wall 33e, a fourth side wall 33f, and an opening 33K.

[0045] The base plate portion 32 is arranged along the XZ plane and has a recess for accommodating the second light source 42. The base plate portion 32 has a base portion 32a and a frame portion 32b. The base portion 32a is a plate-shaped member constituting the main body of the base plate portion 32 and extends relatively long in the X-axis direction. The frame portion 32b is integrally formed with the base portion 32a and is provided on the surface of the base portion 32a located on the +Y side.

[0046] The base plate 32 is connected to the second light source 42 in a heat-conducting manner. Therefore, the base plate 32 is preferably made of a material with specified strength and high thermal conductivity. Therefore, the material of the base plate 32 is, for example, metals such as aluminum and stainless steel, and particularly preferably aluminum alloys such as 6061 series.

[0047] In the cover 33, the top wall portion 33a is arranged along the XZ plane and has a recess for receiving the first light source 41. The first side wall portion 33c and the second side wall portion 33d intersect the X-axis along the length direction of the light source device 30A and are located on opposite sides in the X-axis direction. The first side wall portion 33c is located on one side of the X-axis direction, i.e., the -X side. The second side wall portion 33d is located on the other side of the X-axis direction, i.e., the +X side. The third side wall portion 33e and the fourth side wall portion 33f are located on opposite sides in the Z-axis direction, which intersects the length direction of the light source device 30A. In this embodiment, the third side wall portion 33e is located on one side of the Z-axis direction, i.e., the +Z side. The fourth side wall portion 33f is located on the other side of the Z-axis direction, i.e., the -Z side.

[0048] The top wall portion 33a is connected to the first light source 41 in a heat-conducting manner. Therefore, the cover 33, like the bottom plate portion 32, is preferably made of a material with specified strength and high thermal conductivity. Therefore, the material of the cover 33 is the same as that of the bottom plate portion, for example, using metals such as aluminum or stainless steel, and particularly preferably using aluminum alloys such as 6061 series.

[0049] The first light source 41 has a plurality of first light-emitting elements 411. The plurality of first light-emitting elements 411 are respectively mounted on the top wall portion 33a of the frame 31. In addition, the number of first light-emitting elements 411 in the first light source 41 is not particularly limited.

[0050] The first light-emitting element 411 emits an excitation light E1 in a first wavelength band. The first light-emitting element 411 is, for example, a light-emitting diode (LED). The first light-emitting element 411 is arranged opposite to the wavelength conversion element 51 and emits the excitation light E1 toward the wavelength conversion element 51. The first wavelength band is, for example, the violet to blue band from 400nm to 480nm, with a peak wavelength of, for example, 445nm. A plurality of first light-emitting elements 411 are arranged along the length direction of the wavelength conversion element 51, i.e., the X-axis direction. In this way, the first light source 41 emits an excitation light E composed of a plurality of blue excitation lights E1 toward the wavelength conversion element 51.

[0051] The second light source 42 is positioned opposite the wavelength conversion element 51 to the first light source 41. The second light source 42 has a plurality of second light-emitting elements 421. These multiple second light-emitting elements 421 are respectively mounted in recesses of the base plate portion 32 of the frame 31. Furthermore, the number of second light-emitting elements 421 in the second light source 42 is not particularly limited. The second light-emitting elements 421 are composed of the same light-emitting elements as the first light-emitting element 411. Therefore, the second light source 42 emits an excitation light E composed of multiple blue excitation rays E1 toward the wavelength conversion element 51.

[0052] The excitation light E in this embodiment is an example of the "first light" of the present invention.

[0053] The wavelength conversion element 51 has a cylindrical shape extending along the X-axis and has six faces. The side of the wavelength conversion element 51 extending along the X-axis is longer than the sides extending along the Y-axis and the Z-axis. The X-axis direction corresponds to the length direction of the wavelength conversion element 51. The Y-axis direction is parallel to the shortest side among the sides of the wavelength conversion element 51. The length of the side along the Y-axis is shorter than the length of the side along the Z-axis. That is, the cross-sectional shape of the wavelength conversion element 51 cut along the YZ plane is as follows: Figure 3 The image shown is a rectangle.

[0054] The wavelength conversion element 51 has a surface 51a and a back surface 51b, a first end surface 51c and a second end surface 51d, and a first side surface 51e and a second side surface 51f. The surface 51a and the back surface 51b intersect the Y-axis and face opposite sides of each other along the Y-axis. In this embodiment, the surface 51a is the surface located on one side of the Y-axis direction, i.e., the +Y side. The back surface 51b is the surface located on the other side of the Y-axis direction, i.e., the -Y side. Excitation light E is incident on the surface 51a from the first light source 41 disposed on the top wall portion 33a via the first optical component 55 and the first light guide portion 71. The surface 51a of this embodiment corresponds to an example of the "first surface of the wavelength conversion element" of the present invention.

[0055] like Figure 2 As shown, the first end face 51c and the second end face 51d intersect with the surface 51a and the back surface 51b, and face opposite to each other in the X-axis direction along the length of the wavelength conversion element 51. In this embodiment, the first end face 51c is located on one side of the X-axis direction, i.e., the -X side. The second end face 51d is located on the other side of the X-axis direction, i.e., the +X side. The first end face 51c of this embodiment corresponds to an example of the "second surface of the wavelength conversion element" of the present invention, and the second end face 51d of this embodiment corresponds to an example of the "third surface of the wavelength conversion element" of the present invention.

[0056] like Figure 3 As shown, the first side surface 51e and the second side surface 51f intersect with the surface 51a, the back surface 51b, the first end surface 51c, and the second end surface 51d, and are oriented opposite to each other in the Z-axis direction. In this embodiment, the first side surface 51e is located on one side of the Z-axis direction, i.e., the +Z side, and the second side surface 51f is located on the other side of the Z-axis direction, i.e., the -Z side. The first side surface 51e of this embodiment corresponds to an example of the "fourth surface of the wavelength conversion element" of the present invention, and the second side surface 51f of this embodiment corresponds to an example of the "fifth surface of the wavelength conversion element" of the present invention.

[0057] The wavelength conversion element 51 includes at least a yellow phosphor that converts the excitation light E emitted from the first light source 41 and the second light source 42 in a first band into a yellow phosphor Y in a second band, which is different from the first band. Details will be described later. A portion of the yellow phosphor Y generated inside the wavelength conversion element 51 is emitted from the surface 51a towards the first light guide 71, and another portion of the phosphor Y is emitted from the back surface 51b towards the second light guide 72.

[0058] The wavelength conversion element 51 comprises a ceramic phosphor made of a polycrystalline phosphor that converts the wavelength of the excitation light E into a yellow fluorescent Y. In this embodiment, the wavelength conversion element 51 is made of a so-called transparent phosphor, which does not have light scattering properties. The yellow fluorescent Y has a second wavelength band, for example, a yellow band of 490 nm to 750 nm. The center wavelength of the second wavelength band is, for example, 550 nm. That is, the fluorescent Y is a yellow fluorescence containing both red and green light components. The yellow fluorescent Y in this embodiment corresponds to an example of the "second light" of the present invention.

[0059] In this specification, a transparent phosphor is, for example, a phosphor with a total transmittance of 80% or more for fluorescence. As a transparent phosphor constituting the wavelength conversion element 51, there are transparent single crystals or polycrystalline materials with a total transmittance of 80% or more, such as a YAG ceramic-based ceramic phosphor formed by sintering multiple YAG phosphor particles.

[0060] The wavelength conversion element 51, made of such material, converts the excitation light E into yellow fluorescent Y.

[0061] The wavelength conversion element 51 may also comprise 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 multiple phosphor particles are dispersed in a binder made of glass or resin. The wavelength conversion element 51 made of such a material converts the excitation light E into yellow fluorescence Y.

[0062] Specifically, the material of the wavelength conversion element 51 may include, for example, a 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 carrying out a solid-phase reaction, Y-Al-O amorphous particles obtained by wet methods such as co-precipitation and sol-gel methods, or YAG particles obtained by gas-phase methods such as spray drying, flame thermal decomposition, and thermal plasma methods.

[0063] like Figure 2As shown, the first reflective component 81 is disposed on the -X side of the first light source 41, the second light source 42, the wavelength conversion element 51, the first optical component 55, the second optical component 56, the first light guide 71, and the second light guide 72. The first reflective component 81 is disposed on a portion of the first side wall portion 33c of the cover 33 and a portion of the frame portion 32b of the base plate portion 32. Furthermore, the first reflective component 81 may not necessarily cover all of the aforementioned areas; it is sufficient to be disposed at least on the area on the first end face 51c side of the wavelength conversion element 51, the first optical component 55, the second optical component 56, the first light guide 71, and the second light guide 72.

[0064] The first reflective component 81 reflects the fluorescence Y that propagates within the wavelength conversion element 51, the first light guide 71, and the second light guide 72 and reaches the first reflective component 81. Furthermore, the first reflective component 81 reflects the excitation light E that propagates within the first light guide 71 and the second light guide 72 and reaches the first reflective component 81. That is, the first reflective component 81 reflects both the fluorescence Y and the excitation light E. The first reflective component 81 may be constructed, for example, of a metal film, a dielectric multilayer film, or a scattering component containing barium sulfate.

[0065] like Figure 3 As shown, the wavelength conversion element 51 is supported by the support member 80 in the Z-axis direction. The support member 80 has a first support portion 801 and a second support portion 802.

[0066] A first support portion 801 is disposed on the third side wall portion 33e of the cover 33, supporting the first side surface 51e of the wavelength conversion element 51 (described later). A second reflective member 82 is disposed on the surface of the first support portion 801 on the side of the wavelength conversion element 51. More specifically, the second reflective member 82 is disposed on the side surface 801c of the first support portion 801 opposite to the area on the first side surface 51e of the wavelength conversion element 51 and the area on the first side surface 51e of the first light guide portion 71. The third side wall portion 33e of the cover 33 is connected to the wavelength conversion element 51 via the support member 80 and the second reflective member 82 in a manner that allows for heat transfer.

[0067] The second reflective component 82 reflects the fluorescence Y and the excitation light E. The second reflective component 82 is, for example, composed of a metal film, a dielectric multilayer film, a scattering component, etc.

[0068] Therefore, the second reflective member 82, for example, reflects the excitation light E that has passed through the wavelength conversion element 51, the first light guide 71, and the second light guide 72 and reaches the second reflective member 82, so that it is incident on the wavelength conversion element 51. This improves the conversion efficiency from the excitation light E to the fluorescence Y. Furthermore, the second reflective member 82 reflects the fluorescence Y that has emitted from the wavelength conversion element 51 and propagated within the first light guide 71 and the second light guide 72 to reach the second reflective member 82. This improves the extraction efficiency of the fluorescence Y.

[0069] The second support portion 802 is disposed on the fourth side wall portion 33f of the cover 33, supporting the second side surface 51f of the wavelength conversion element 51 (described later). The third reflective member 83 is disposed on the surface of the second support portion 802 on the side of the wavelength conversion element 51. More specifically, the third reflective member 83 is disposed on the side surface 802c of the second support portion 802 opposite to the area on the second side surface 51f of the wavelength conversion element 51 and the second side surface 51f of the second light guide portion 72. The fourth side wall portion 33f of the cover 33 is connected to the wavelength conversion element 51 via the support member 80 and the third reflective member 83 in a manner that allows for heat transfer.

[0070] Furthermore, the third reflective element 83 reflects the fluorescence Y and the excitation light E. The third reflective element 83 is, for example, composed of a metal film, a dielectric multilayer film, a scattering element, etc.

[0071] Therefore, the third reflecting member 83, for example, reflects the excitation light E that has passed through the wavelength conversion element 51, the first light guide 71, and the second light guide 72 and reaches the third reflecting member 83, so that it is incident on the wavelength conversion element 51. This improves the conversion efficiency from the excitation light E to the fluorescence Y. Furthermore, the third reflecting member 83 reflects the fluorescence Y that has emitted from the wavelength conversion element 51 and propagated within the first light guide 71 and the second light guide 72 to reach the third reflecting member 83. This improves the extraction efficiency of the fluorescence Y.

[0072] Thus, according to the light source device 30 of this embodiment, by efficiently releasing the heat of the wavelength conversion element 51 to the outside via the cover 33, the temperature rise of the wavelength conversion element 51 can be suppressed, and the decrease in wavelength conversion efficiency accompanying the temperature rise of the wavelength conversion element 51 can be suppressed.

[0073] The first light guide 71 is supported in the Z-axis direction by the second reflective member 82 and the third reflective member 83 on the first support 801 and the second support 802. In addition, the first light guide 71 is disposed in the Y-axis direction between the wavelength conversion element 51 and the first optical member 55 to guide the fluorescent Y converted by the wavelength conversion element 51.

[0074] The first light guide portion 71 of this embodiment includes a first light-transmitting component 711 and an air layer 712. The first light-transmitting component 711 is fixed to the surface 51a of the wavelength conversion element 51 by a light-transmitting adhesive 713, transmitting excitation light E and yellow fluorescence Y. The air layer 712 is disposed between the first light-transmitting component 711 and the first optical component 55.

[0075] According to the first light guide portion 71 of this embodiment, the first light-transmitting member 711 is coupled to the wavelength conversion element 51, therefore, there is no air layer between the first light-transmitting member 711 and the wavelength conversion element 51. Therefore, the fluorescence Y emitted from the wavelength conversion element 51 is less likely to undergo total internal reflection at the interface with the first light-transmitting member 711, thus efficiently entering the first light-transmitting member 711. Therefore, the first light guide portion 71 can efficiently capture the fluorescence Y.

[0076] In this embodiment, the refractive index (1.4: quartz) of the first light-transmitting component 711 is smaller than that of the wavelength conversion element 51 (YAG: 1.7). The material of the first light-transmitting component 711, besides quartz, can be, for example, borosilicate glass such as BK7, synthetic quartz, or crystal. According to this structure, when fluorescence Y is incident from the wavelength conversion element 51 onto the first light-transmitting component 711, it is refracted, thereby reducing the angle between the fluorescence Y and the X-axis along the long axis of the first light-transmitting component 711. That is, the fluorescence Y propagating within the first light-transmitting component 711 is incident at a smaller angle relative to the end face 711d on the side perpendicular to the X-axis. Therefore, the first light-transmitting component 711 can efficiently extract fluorescence Y from the end face 711d on the side of the second end face 51d.

[0077] Furthermore, it is preferable that the thermal conductivity of the first light-transmitting component 711 is greater than that of the wavelength conversion element 51. The material of the first light-transmitting component 711 that satisfies this relationship is, for example, SiC, GaN, MgO, YAG, sapphire, and diamond. In this embodiment, the first light-transmitting component 711 is, for example, made of quartz. According to this structure, heat from the wavelength conversion element 51 is efficiently transferred to the first light-transmitting component 711 via the light-transmitting adhesive 713, thus suppressing the temperature rise of the wavelength conversion element 51. Therefore, the decrease in luminous efficiency accompanying the temperature rise of the wavelength conversion element 51 can be suppressed.

[0078] The second light guide portion 72 is supported in the Z-axis direction by the second reflective member 82 and the third reflective member 83 on the first support portion 801 and the second support portion 802. In addition, the second light guide portion 72 is disposed between the wavelength conversion element 51 and the second optical member 56 to guide the fluorescent Y converted by the wavelength conversion element 51.

[0079] The second light guide portion 72 of this embodiment includes a second light-transmitting member 721 and an air layer 722. The second light-transmitting member 721 is configured to be bonded to the back surface 51b of the wavelength conversion element 51 using a light-transmitting adhesive 713, and transmits excitation light E and yellow fluorescence Y. The air layer 722 is disposed between the second light-transmitting member 721 and the second optical member 56.

[0080] According to the second light guide 72 of this embodiment, similar to the first light guide 71, there is no air layer between the first light-transmitting member 711 and the wavelength conversion element 51. As a result, total internal reflection of fluorescence Y at the interface is suppressed, and thus, fluorescence Y can be efficiently captured into the second light-transmitting member 721.

[0081] Like the first light-transmitting component 711, the second light-transmitting component 721 is made of a material with a lower refractive index than the wavelength conversion element 51. Therefore, the second light-transmitting component 721 can efficiently extract the fluorescence Y from the end face 721d on the second end face 51d side. Furthermore, like the first light-transmitting component 711, the second light-transmitting component 721 is preferably made of a material with a higher thermal conductivity than the wavelength conversion element 51. According to this structure, the heat from the wavelength conversion element 51 is efficiently transferred to the second light-transmitting component 721, thus suppressing the decrease in luminous efficiency that accompanies the increase in temperature of the wavelength conversion element 51.

[0082] According to the light source device 30A of this embodiment, by providing an air layer 712 with a larger refractive index difference relative to the first light-transmitting member 711 in the first light guide section 71, total internal reflection of the fluorescence Y generated in the wavelength conversion element 51 at the interface between the first light-transmitting member 711 and the air layer 712 can be easily achieved. Similarly, in the second light guide section 72, by providing an air layer 722 with a larger refractive index difference relative to the second light-transmitting member 721, total internal reflection of the fluorescence Y generated in the wavelength conversion element 51 at the interface between the second light-transmitting member 721 and the air layer 722 can be easily achieved.

[0083] Therefore, according to the light source device 30A of this embodiment, fluorescence Y propagating in the first light-transmitting member 711 via total internal reflection in the first light guide 71 can be emitted from the end face 711d on the second end face 51d side of the first light-transmitting member 711, and fluorescence Y propagating in the second light guide 721 via total internal reflection in the second light-transmitting member 72 can be emitted from the end face 721d on the second end face 51d side of the second light-transmitting member 721. Therefore, the extraction efficiency of fluorescence Y can be improved.

[0084] Fluorescent Y, which is emitted through the first light-transmitting component 711 and into the air layer 712, is incident on the first optical component 55.

[0085] The first optical component 55 is disposed between the first light source 41 and the wavelength conversion element 51. For example... Figure 3As shown, the first optical component 55 is disposed on the upper surface 801a of the first support portion 801 on the +Y side and the upper surface 802a of the second support portion 802 on the +Y side. Thus, the first optical component 55 covers the side (+Y side) of the first light guide portion 71 disposed between the first support portion 801 and the second support portion 802 that is opposite to the wavelength conversion element 51. The first optical component 55 transmits excitation light E and reflects fluorescence Y.

[0086] The first optical component 55 has a first transparent substrate 551 and a first optical layer 552.

[0087] The first transparent substrate 551 is made of, for example, a light-transmitting material such as borosilicate glass (BK7), quartz, synthetic quartz, crystal, SiC, GaN, MgO, YAG, sapphire, and diamond. The first transparent substrate 551 needs to be made of a material capable of transmitting at least the excitation light E. The first transparent substrate 551 has a plate-like shape extending along the X-axis. Figure 3 As shown, the first transparent substrate 551 has a rectangular cross-sectional shape when cut along the YZ plane and extends relatively long in the X-axis direction.

[0088] The first optical layer 552 is, for example, composed of a dielectric multilayer film and has the optical properties of transmitting excitation light E and reflecting fluorescence Y. The first optical layer 552 is formed on the surface of the first transparent substrate 551. The first optical layer 552 is disposed between the wavelength conversion element 51 and the first transparent substrate 551. That is, the first optical layer 552 is disposed on the surface 551a of the first transparent substrate 551 opposite to the wavelength conversion element 51. According to this structure, as described later, the fluorescence Y does not incident on the first transparent substrate 551 but is reflected by the first optical layer 552. Therefore, the loss of fluorescence Y caused by propagation within the first transparent substrate 551 can be suppressed, and the utilization efficiency of fluorescence Y can be improved.

[0089] The first optical component 55 is pressed against the support component 80 by the pressing member 88. The pressing member 88 is disposed between the first optical component 55 and the top wall portion 33a of the cover 33 in the frame 31. The pressing member 88 is composed of an elastic member that generates a pressing force that presses the first optical component 55 toward the support component 80. Furthermore, as the elastic member constituting the pressing member 88, a spring member, an elastic body, etc., can be used, for example.

[0090] The pressing member 88 abuts against the surface 551b of the first transparent substrate 551 of the first optical member 55, which is opposite to the first optical layer 552. According to this structure, the pressing member 88 does not directly press the first optical layer 552, thus suppressing the occurrence of defects such as deformation or damage caused by applying external force to the first optical layer 552.

[0091] Thus, the first optical component 55 covers the +Y side of the first light guide portion 71 sandwiched between the first support portion 801 and the second support portion 802 in the Z-axis direction. The width of the first optical component 55 in the Z-axis direction is larger than the gap generated between the first support portion 801 and the second support portion 802. That is, the first optical component 55 is configured to span between the first support portion 801 and the second support portion 802 in the Z-axis direction. Therefore, both ends of the first optical component 55 are disposed on the first support portion 801 and the second support portion 802.

[0092] Here, in the first optical component 55, the first optical layer 552 is formed on the entire surface of the first transparent substrate 551. Therefore, it is difficult to uniformly form the first optical layer 552 to the end of the first transparent substrate 551. Furthermore, during the manufacturing process of the first optical component 55, the end face of the first transparent substrate 551 on which the first optical layer 552 is formed is ground. However, at this time, it is easy to generate a notch on the end face of the first transparent substrate 551, and a portion of the first optical layer 552 may be damaged along with the end face of the first transparent substrate 551. Thus, the end of the first optical layer 552 is considered a defective region where the desired optical properties cannot be obtained due to defects caused by poor film formation or defects.

[0093] In the light source device 30A of this embodiment, the first optical component 55 spans between the first support portion 801 and the second support portion 802. Therefore, the ends of the first optical layer 552, which correspond to the aforementioned defective portions, can be positioned outside the gap between the first support portion 801 and the second support portion 802. In this embodiment, an air layer 712 of the first light guide portion 71 is provided in the gap on the +Y side of the first support portion 801 and the second support portion 802.

[0094] Furthermore, in this embodiment, the first optical layer 552 abuts against the first support portion 801 and the second support portion 802, therefore, as Figure 3 As shown, the defective portion 552K of the first optical layer 552 is not connected to the air layer 712 located in the gap between the first support portion 801 and the second support portion 802. Therefore, there is no situation where a portion of the fluorescence Y propagating within the air layer 712 leaks out to the first light source 41 side due to incident on the defective portion 552K, thus becoming a loss. Therefore, by suppressing the light loss caused by the defective portion 552K of the first optical layer 552, the light utilization efficiency of the fluorescence Y can be improved.

[0095] Fluorescent Y, which is emitted through the second light-transmitting component 721 and into the air layer 722, is incident on the second optical component 56.

[0096] The second optical component 56 is disposed between the second light source 42 and the wavelength conversion element 51. For example... Figure 3 As shown, the second optical component 56 is disposed on the lower surface 801b of the first support portion 801 on the -Y side and the lower surface 802b of the second support portion 802 on the -Y side. Thus, the second optical component 56 covers the side (-Y side) of the second light guide portion 72 disposed between the first support portion 801 and the second support portion 802 that is opposite to the wavelength conversion element 51. The second optical component 56 transmits excitation light E and reflects fluorescence Y.

[0097] The second optical component 56 has a second transparent substrate 561 and a second optical layer 562.

[0098] The second transparent substrate 561, like the first transparent substrate 551, is made of a light-transmitting material such as borosilicate glass (BK7), quartz, synthetic quartz, crystal, SiC, GaN, MgO, YAG, sapphire, and diamond. The second transparent substrate 561 needs to be made of a material capable of transmitting at least the excitation light E. The second transparent substrate 561 has a plate-like shape extending along the X-axis. Figure 3 As shown, the cross-sectional shape of the second transparent substrate 561 cut along the YZ plane has a rectangular shape and extends relatively long in the X-axis direction.

[0099] The second optical layer 562 is composed of the same dielectric multilayer film as the first optical layer 552 and has the optical properties of transmitting excitation light E and reflecting fluorescence Y. The second optical layer 562 is disposed on the side 561a opposite to the wavelength conversion element 51 of the two surfaces of the second transparent substrate 561. According to this structure, as will be described later, the fluorescence Y does not incident on the second transparent substrate 561 but is reflected by the second optical layer 562. Therefore, the loss of fluorescence Y caused by propagation inside the second transparent substrate 561 can be suppressed, and the utilization efficiency of fluorescence Y can be improved.

[0100] Like the first optical component 55, the second optical component 56 is pressed against the support component 80 by the pressing component 88. The pressing component 88 is disposed between the second optical component 56 and the top wall portion 33a of the cover 33 in the frame 31. The pressing component 88 abuts against the surface 561b of the second transparent substrate 561 opposite to the second optical layer 562, and does not directly press the second optical layer 562. Therefore, it can suppress the occurrence of deformation and damage in the second optical layer 562.

[0101] Furthermore, the second optical component 56 covers the -Y side of the second light guide portion 72 sandwiched between the first support portion 801 and the second support portion 802 in the Z-axis direction. The second optical component 56 is configured to span between the first support portion 801 and the second support portion 802 in the Z-axis direction, with both ends of the second optical component 56 located on the first support portion 801 and the second support portion 802. Additionally, the second optical component 56 has the same structure as the first optical component 55; therefore, it is considered that a defect portion is also generated at the end of the second optical layer 562.

[0102] In the light source device 30A of this embodiment, the second optical component 56 spans between the first support portion 801 and the second support portion 802. Therefore, the end of the second optical layer 562, which corresponds to the defect portion, is located outside the gap between the first support portion 801 and the second support portion 802. In this embodiment, an air layer 712 of the first light guide portion 71 is provided in the gap on the -Y side of the first support portion 801 and the second support portion 802.

[0103] Furthermore, in this embodiment, the second optical layer 562 abuts against the first support portion 801 and the second support portion 802, therefore, as Figure 3 As shown, the defective portion 562K of the second optical layer 562 is not connected to the air layer 722 located in the gap between the first support portion 801 and the second support portion 802. Therefore, there will be no situation where a portion of the fluorescence Y propagating within the air layer 722 leaks out to the second light source 42 side due to incident on the defective portion 562K, thus becoming a loss. Therefore, by suppressing the light loss caused by the defective portion 562K of the second optical layer 562, the light utilization efficiency of the fluorescence Y can be improved.

[0104] Figure 4 This is a plan view of the light source device 30A viewed from the +X side towards the -X side. That is, Figure 4 This is a plan view taken along the normal direction of the second end face 51d of the YZ plane in the wavelength conversion element 51, i.e., in the X-axis direction. For example... Figure 4 As shown, the outlet 31K overlaps with the first light guide 71, the wavelength conversion element 51, and the second light guide 72. Therefore, the outlet 31K of the frame 31 has a shape that exposes the first light guide 71, the wavelength conversion element 51, and the second light guide 72 inside.

[0105] The light source device 30A of this embodiment can extract the yellow fluorescent Y that propagates inside the first light guide 71, the wavelength conversion element 51 and the second light guide 72 via the outlet 31K of the frame 31 and emit it as illumination light WL.

[0106] like Figure 1As shown, an integrating optical system 90 is provided on the light emission side of the light source device 30A. The integrating optical system 90 has a first lens array 91 and a second lens array 92. Together with the overlapping optical system 94, the integrating optical system 90 functions as a uniform illumination optical system that homogenizes the intensity distribution of the illumination light WL emitted from the light source device 30A in each of the light modulation devices 4R, 4G, and 4B, which are the illuminated areas.

[0107] 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 first illumination device 11. The plurality of first lenses 91a divides the illumination light WL emitted from the light source device 30A into multiple partial beams. Each of the first lenses 91a has a rectangular shape that is approximately similar in shape to the image forming areas of the light modulation devices 4R, 4G, and 4B. Thus, the partial beams emitted from the first lens array 91 are efficiently incident on the image forming areas of the light modulation devices 4R, 4G, and 4B, respectively.

[0108] The illumination light WL emitted from the first lens array 91 travels toward the second lens array 92. The second lens array 92 is arranged opposite to 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. Together with the overlapping optical system 94, the second lens array 92 images the images of the plurality of first lenses 91a of the first lens array 91 onto the vicinity of the image forming areas of the light modulation devices 4R, 4G, and 4B, respectively. The plurality of second lenses 92a are arranged in a matrix in a plane parallel to the YZ plane orthogonal to the optical axis AX1 of the first illumination device 11. The overlapping optical system 94 is composed of a single convex lens.

[0109] In this embodiment, each first lens 91a of the first lens array 91 and each second lens 92a of the second lens array 92 have the same size as each other, but they may also have different sizes. In addition, in this embodiment, the first lens 91a of the first lens array 91 and the second lens 92a of the second lens array 92 are arranged at a position aligned with each other's optical axes, but they may also be arranged in a state of being off-center from each other.

[0110] The polarization conversion element 93 converts the polarization direction of the illumination light WL emitted from the second lens array 92. Specifically, the polarization conversion element 93 converts the portions of the illumination light WL, which are divided by the first lens array 91 and emitted from the second lens array 92, into linearly polarized light. The polarization conversion element 93 has a polarization separation layer, a reflective layer, and a phase difference layer (not shown). The polarization separation layer allows the linearly polarized component of one of the polarization components contained in the illumination light WL emitted from the light source device 30A to pass directly through, and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1. The reflective 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 reflective layer into a single linearly polarized component.

[0111] The behavior of light in the light source device 30A of this embodiment will be described below.

[0112] like Figure 2 As shown, in the light source device 30A, excitation light E emitted from the first light source 41 passes through the first optical component 55 and the first light guide 71 and is incident on the wavelength conversion element 51. Furthermore, excitation light E emitted from the second light source 42 passes through the second optical component 56 and the second light guide 72 and is incident on the wavelength conversion element 51. When the excitation light E is incident on the wavelength conversion element 51, the phosphor contained within the wavelength conversion element 51 is excited, emitting fluorescence Y from any emission point in various directions.

[0113] The fluorescence Y1 emitted from the wavelength conversion element 51 is incident at an angle less than the critical angle relative to the surface 51a of the wavelength conversion element 51 and enters the first light-transmitting member 711 of the first light guide 71.

[0114] Furthermore, the fluorescence Y1 is totally reflected when incident at an angle greater than the critical angle at the interface between the first light-transmitting member 711 and the air layer 712, and is emitted outward from the end face 711d on the side of the second end face 51d of the first light-transmitting member 711. Although the figure is omitted, a portion of the fluorescence Y that is totally reflected at the interface between the first light-transmitting member 711 and the air layer 712 propagates within the first light-transmitting member 711 through total internal reflection and is emitted outward from the end face 711d on the side of the second end face 51d of the first light-transmitting member 711.

[0115] Furthermore, the fluorescence Y2 emitted from the wavelength conversion element 51 is incident at an angle less than the critical angle relative to the interface between the first light-transmitting member 711 and the air layer 712, thereby passing through the first light-transmitting member 711 and entering the air layer 712. The fluorescence Y2 is reflected by the first optical layer 552 of the first optical member 55 and passes through the air layer 712, re-entering the first light-transmitting member 711, and is emitted outward from the end face 711d on the second end face 51d side of the first light-transmitting member 711. Although not shown in the figure, a portion of the fluorescence Y that re-enters the first light-transmitting member 711 propagates within the first light-transmitting member 711 by total internal reflection and is emitted outward from the end face 711d on the second end face 51d side.

[0116] Furthermore, the fluorescence Y3 emitted from the wavelength conversion element 51 and reaching the first reflective member 81 is reflected by the first reflective member 81 and travels toward the +X side, for example, being reflected between the first optical layer 552 of the first optical member 55 and the first light-transmitting member 711 or air layer 712, thereby propagating inside the first light guide 71 and being emitted outward from the region on the second end face 51d side of the first light guide 71.

[0117] Furthermore, the fluorescence Y4 emitted from the wavelength conversion element 51, which is incident at an angle of incidence greater than the critical angle relative to the surface 51a of the wavelength conversion element 51, is reflected by the surface 51a and guided inside the wavelength conversion element 51. In this embodiment, the wavelength conversion element 51 is made of a transparent phosphor, so no scattering of the fluorescence Y4 occurs inside the wavelength conversion element 51, and the incident angle of the fluorescence Y4 relative to the surface 51a or the back surface 51b of the wavelength conversion element 51 does not change. Therefore, the fluorescence Y4 traveling toward the +X side is repeatedly reflected between the surface 51a and the back surface 51b of the wavelength conversion element 51 and emitted from the second end face 51d. On the other hand, the fluorescence Y4 traveling toward the -X side, like the fluorescence Y3, is reflected by the first reflecting member 81, travels toward the +X side, is repeatedly reflected between the surface 51a and the back surface 51b of the wavelength conversion element 51, and emitted from the second end face 51d.

[0118] In this way, the fluorescence Y emitted from the wavelength conversion element 51 is repeatedly reflected between the wavelength conversion element 51 or the first light-transmitting component 711 of the first light guide 71 and the first optical layer 552 of the first optical component 55, thereby propagating inside the first light-transmitting component 711 and the air layer 712, and being emitted to the outside from the end face 711d on the second end face 51d side of the first light-transmitting component 711 and the area on the second end face 51d side of the air layer 712.

[0119] In this embodiment, the behavior of the fluorescence Y incident directly from the wavelength conversion element 51 or via the first light guide 71 or the first optical component 55 onto the side of the second light guide 72 can also be described as the same.

[0120] Therefore, in the light source device 30A of this embodiment, the fluorescence Y converted by the wavelength conversion element 51 travels through the wavelength conversion element 51, the first light guide 71, and the second light guide 72, and is emitted from the second end face 51d side of the wavelength conversion element 51, the first light guide 71, and the second light guide 72. Therefore, according to the light source device 30A of this embodiment, the illumination light WL containing fluorescence Y can be efficiently extracted to the outside from the extraction port 31K of the frame 31.

[0121] Furthermore, in this embodiment, the wavelength conversion element 51 is made of a transparent phosphor, therefore, as Figure 2 As shown, the direction of travel of the fluorescence Y0 emitted from the wavelength conversion element 51, which is incident from the normal direction onto the first optical layer 552 or the second optical layer 562 and reflected perpendicularly, does not change significantly during its transmission through the interior of the wavelength conversion element 51, and is repeatedly reflected between the first optical layer 552 and the second optical layer 562. Thus, the fluorescence Y0 repeatedly reflected between the first optical layer 552 and the second optical layer 562 is absorbed during its multiple propagations within the wavelength conversion element 51.

[0122] In this embodiment, the light source device 30A extracts the illumination light WL from the outlet 31K of the housing 31. Therefore, the optical spread of the illumination light WL is small, which reduces the loss of the illumination light WL in optical components such as the integrating optical system 90 disposed in the subsequent stage of the light source device 30A. As a result, the utilization efficiency of the illumination light WL in the light source device 30A can be improved.

[0123] (Effects of the first embodiment)

[0124] The light source device 30A of this embodiment includes: a first light source 41 that emits excitation light E; a wavelength conversion element 51 that converts the excitation light E into yellow fluorescence Y; a first optical component 55 disposed between the first light source 41 and the wavelength conversion element 51, transmitting the excitation light E and reflecting the fluorescence Y; a first light guide 71 disposed between the wavelength conversion element 51 and the first optical component 55, guiding the fluorescence Y converted by the wavelength conversion element 51; a first reflective component 81 that reflects the excitation light E and the fluorescence Y; and a support component 80 that supports the wavelength conversion element 51. The wavelength conversion element 51 includes: a surface 51a into which the excitation light E is incident via the first optical component 55 and the first light guide 71; a first end surface 51c and a second end surface 51d that intersect the surface 51a and face opposite sides to each other; and a first side surface 51e and a second side surface 51f that intersect the surface 51a, the first end surface 51c, and the second end surface 51d and face opposite sides to each other. The first reflective member 81 is disposed in the region on the first end face 51c side of the wavelength conversion element 51 and the region on the first end face 51c side of the first light guide 71. The fluorescence Y converted by the wavelength conversion element 51 travels in the first light guide 71 and is emitted from the region on the second end face 51d side of the first light guide 71. The support member 80 has: a first support portion 801, which supports the first side surface 51e of the wavelength conversion element 51; and a second support portion 802, which supports the second side surface 51f of the wavelength conversion element 51. The first optical member 55 abuts against the first support portion 801 and the second support portion 802, covering the side of the first light guide 71 disposed between the first support portion 801 and the second support portion 802 opposite to the wavelength conversion element 51.

[0125] Furthermore, the light source device 30A of this embodiment also includes: a second light source 42, which is disposed opposite to the first light source 41 relative to the wavelength conversion element 51 and emits excitation light E; a second optical component 56, which is disposed between the second light source 42 and the wavelength conversion element 51, transmits the excitation light E and reflects fluorescence Y; and a second light guide 72, which is disposed between the wavelength conversion element 51 and the second optical component 56, and guides the fluorescence Y converted by the wavelength conversion element 51. The fluorescence Y converted by the wavelength conversion element 51 travels in the second light guide 72 and is emitted from the region of the second end face 51d of the second light guide 72. The second optical component 56 abuts against the first support portion 801 and the second support portion 802, covering the side of the second light guide 72 disposed between the first support portion 801 and the second support portion 802 opposite to the wavelength conversion element 51.

[0126] According to the light source device 30A of this embodiment, the fluorescence Y generated by the wavelength conversion element 51 travels in the first light guide section 71 and is emitted from the region on the side of the second end face 51d of the first light-transmitting member 711 and the region on the side of the second end face 51d of the air layer 712. Furthermore, the fluorescence Y generated by the wavelength conversion element 51 travels in the second light guide section 72 and is emitted from the region on the side of the second end face 51d of the second light-transmitting member 721 and the region on the side of the second end face 51d of the air layer 722.

[0127] Therefore, compared with conventional light source devices that only propagate and extract fluorescence inside the wavelength conversion element through total internal reflection, the light source device 30A of this embodiment has less loss of fluorescence Y and can improve the utilization efficiency of fluorescence Y.

[0128] Furthermore, in the light source device 30A of this embodiment, the first optical component 55 covers the side of the first light guide 71 opposite to the wavelength conversion element 51, and the second optical component 56 covers the side of the second light guide 72 opposite to the wavelength conversion element 51. Therefore, the defective portion 552K generated at the end of the first optical layer 552 and the defective portion 562K generated at the end of the second optical layer 562 are not connected to the air layers 712 and 722 between the first support portion 801 and the second support portion 802. Therefore, it is possible to suppress a portion of the fluorescent Y propagating in the air layers 712 and 722 from incident on the defective portions 552K and 562K as light loss, and the light utilization efficiency of the fluorescent Y can be further improved.

[0129] Furthermore, in this embodiment, at the extraction port 31K, the air layers 712 and 722 are open to the external space and do not have a refractive index interface. Therefore, the fluorescent Y reaching the extraction port 31K through the air layers 712 and 722 is emitted directly into the external space without reflection or refraction. Thus, the first light guide portion 71 and the second light guide portion 72 include the air layers 712 and 722, thereby improving the extraction efficiency of the fluorescent Y.

[0130] The projector 1 of this embodiment includes: a light source device 30A; light modulation devices 4R, 4G, and 4B that modulate the light emitted from the light source device 30A; and a projection optical device 6 that projects the light modulated by the light modulation devices 4R, 4G, and 4B.

[0131] The projector 1 according to this embodiment has a first illumination device 11 that includes a light source device 30A that efficiently extracts illumination light WL containing fluorescence Y, and therefore has excellent light utilization efficiency.

[0132] (Second Implementation)

[0133] The following uses Figure 5 The second embodiment of the present invention will be described.

[0134] The basic structure of the light source device in the second embodiment is the same as that in the first embodiment; therefore, the description of the basic structure of the light source device is omitted.

[0135] Figure 5 This is a cross-sectional view showing the light source device 30B of the second embodiment cut along the XY plane. Figure 5 In this document, the same reference numerals are used for the same constituent elements as those used in the first embodiment, and descriptions are omitted.

[0136] like Figure 5 As shown, the light source device 30B of this embodiment includes a frame 31, a first light source 41, a second light source 42, a wavelength conversion element 52, a first optical component 55, a second optical component 56, a first light guide 71, a second light guide 72, a support component 80, a pressing component 88, a first reflective component 81, and a second and third reflective components (not shown).

[0137] In the light source device 30A of the first embodiment, the wavelength conversion element 51 is composed of a transparent phosphor. In contrast, in the light source device 30B of this embodiment, the wavelength conversion element 52 is composed of a phosphor with light-scattering properties. A phosphor with light-scattering properties can be achieved by dispersing a scattering medium, such as pores or fillers, with a refractive index different from that of the transparent phosphor within the transparent phosphor. The wavelength conversion element 52 has a surface 52a and a back surface 52b, a first end surface 52c and a second end surface 52d, and a first side surface 52e and a second side surface 52f.

[0138] The other structures of the light source device 30B are the same as those of the light source device 30A in the first embodiment.

[0139] The surface 52a, the first end face 52c, the second end face 52d, the first side face 52e, and the second side face 52f of this embodiment correspond to an example of the "first face, second face, third face, fourth face, and fifth face" of the present invention, respectively.

[0140] (Effects of the second implementation method)

[0141] In this embodiment, the fluorescence Y propagates within the first light guide section 71 and the second light guide section 72, achieving the same effect as in the first embodiment: a light source device 30B with low fluorescence Y loss and excellent fluorescence Y utilization efficiency, and a light source device 30B capable of efficiently emitting illumination light WL. Furthermore, the same effect as in the first embodiment is achieved: a light source device 30B that further improves the light utilization efficiency of fluorescence Y by suppressing a portion of the fluorescence Y propagating within the air layers 712 and 722 from incident on the defect locations 552K and 562K.

[0142] In the first embodiment, the wavelength conversion element 51 is made of a transparent phosphor. Therefore, the fluorescence Y emitted from the wavelength conversion element 51 is perpendicularly incident on the first optical layer 552 or the second optical layer 562 (see reference). Figure 2 The direction of travel of the wavelength conversion element 51 is not easily changed, and it is repeatedly reflected between the first optical layer 552 and the second optical layer 562, resulting in loss.

[0143] In contrast, in the case of the light source device 30B of this embodiment, the wavelength conversion element 52 is made of a phosphor with light scattering properties, therefore, as Figure 5 As shown, when the fluorescence Y reflected by the first optical layer 552 or the second optical layer 562 is incident on the wavelength conversion element 52, a lot of scattering occurs, and the direction of travel of the fluorescence Y changes each time it is scattered.

[0144] Therefore, for example, the fluorescence Y0 reflected by the first optical layer 552 and incident perpendicularly onto the wavelength conversion element 52 is also scattered within the wavelength conversion element 52, resulting in angle conversion. Consequently, it ultimately propagates within the first light guide 71 and exits from the region on the second end face 51d side of the first light-transmitting member 711 and the region on the second end face 51d side of the air layer 712. Alternatively, it propagates within the second light guide 72 and exits from the region on the second end face 51d side of the second light-transmitting member 721 and the region on the second end face 51d side of the air layer 722.

[0145] Thus, in the light source device 30B of this embodiment, the fluorescence Y propagates within the first light guide 71 and is emitted from the region on the second end face 51d side of the first light guide 71 while undergoing at least one of scattering by the wavelength conversion element 52, reflection by the first optical layer 552 of the first optical component 55, and reflection by the surface of the first light-transmitting component 711 in contact with the air layer 712. Furthermore, the fluorescence Y propagates within the second light guide 72 and is emitted from the region on the second end face 51d side of the second light guide 72 while undergoing at least one of scattering by the wavelength conversion element 52, reflection by the second optical layer 562 of the second optical component 56, and reflection by the surface of the second light-transmitting component 721 in contact with the air layer 722.

[0146] In this embodiment, almost no fluorescence Y is not emitted to the outside due to propagation inside the wavelength conversion element 52. Therefore, the light source device 30B according to this embodiment can efficiently extract the fluorescence Y as illumination light WL.

[0147] Furthermore, the wavelength conversion element 52, which is made of a light-scattering phosphor, is more prone to reabsorption of the transmitted fluorescence Y compared to the wavelength conversion element 51 of the first embodiment, which is made of a transparent phosphor. Therefore, it is preferable that the dimension of the wavelength conversion element 52 in the X-axis direction, i.e., the direction in which the fluorescence Y is extracted, is shorter than that of the wavelength conversion element 51 of the first embodiment. In addition, the X-axis direction corresponds to the length direction of the wavelength conversion element 52.

[0148] According to the light source device 30B of this embodiment, compared with the structure of the first embodiment, the length dimension of the wavelength conversion element 52 can be shortened, and the light utilization efficiency of the fluorescent Y can be improved.

[0149] Therefore, the light source device 30B of this embodiment can realize a light source device that can miniaturize the device structure and improve the light utilization efficiency of fluorescent Y.

[0150] Furthermore, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0151] For example, in the above embodiment, a composite phosphor containing AlN and Ce:YAG can be used as the constituent material of the first wavelength conversion element. According to this structure, even in a structure where the contact area between the first wavelength conversion element and the frame is small and a large number of heat dissipation paths cannot be ensured, the thermal conductivity of the first wavelength conversion element can be improved compared to the case of using a Ce:YAG monomer phosphor. This improves the cooling efficiency of the first wavelength conversion element. Consequently, the maximum light intensity of the first excitation light can be increased, and the maximum output of yellow fluorescence can be increased. Similarly, a composite phosphor can also be used for the second wavelength conversion element.

[0152] Furthermore, the light source devices described in the above embodiments all include a second light source, but a structure that only includes a first light source is also possible. In this case, the second light guide 72 and the second optical component 56 may be omitted. In this case, the frame 31 may be configured to support the back surface 52b of the wavelength conversion element 51.

[0153] Furthermore, in the above-described embodiment, both the first light guide portion and the second light guide portion of the light source device are composed of a light-transmitting component and an air layer; however, at least either the first light guide portion or the second light guide portion may be composed solely of an air layer. Alternatively, at least either the first light guide portion or the second light guide portion may be composed solely of a light-transmitting component.

[0154] Furthermore, the specific descriptions regarding the shape, quantity, arrangement, materials, etc., of the various components of the light source device and projector are not limited to the above embodiments and can be appropriately modified. Additionally, the above embodiments show an example of mounting the light source device of the present invention on a projector using a liquid crystal panel, but this is not a limitation. The light source device of the present invention can also be applied to a projector using a digital micromirror device as a light modulation device. Furthermore, the projector may not have multiple light modulation devices, or it may have only one light modulation device.

[0155] The above embodiments illustrate an example of applying the light source device of the present invention to a projector, but are not limited thereto. The light source device of the present invention can also be applied to lighting fixtures, automotive headlights, etc.

[0156] [Summary of this disclosure]

[0157] The following is a summary published in this note.

[0158] (Postscript 1)

[0159] A light source device comprising: a first light source emitting first light of a first wavelength band; a wavelength conversion element converting the first light into second light of a second wavelength band different from the first wavelength band; a first optical component disposed between the first light source and the wavelength conversion element, transmitting the first light and reflecting the second light; a first light guide disposed between the wavelength conversion element and the first optical component, guiding the second light converted by the wavelength conversion element; a first reflective component reflecting the first light and the second light; and a support component supporting the wavelength conversion element, the wavelength conversion element having: a first surface onto which the first light is incident via the first optical component and the first light guide; a second surface and a third surface intersecting the first surface and facing each other. The first reflective component is disposed in the region of the second surface of the wavelength conversion element and the region of the second surface of the first light guide. The second light converted by the wavelength conversion element travels in the first light guide and exits from the region of the third surface of the first light guide. The supporting component has: a first supporting portion that supports the fourth surface of the wavelength conversion element; and a second supporting portion that supports the fifth surface of the wavelength conversion element. The first optical component abuts against the first supporting portion and the second supporting portion, covering the side of the first light guide disposed between the first supporting portion and the second supporting portion opposite to the wavelength conversion element.

[0160] According to this light source device, the second light generated by the wavelength conversion element travels in the first light guide section and is emitted from the region on the third surface side of the first light guide section. Therefore, compared with existing light source devices that only propagate and extract the second light inside the wavelength conversion element through total internal reflection, this light source device has less loss of the second light and can improve light utilization efficiency.

[0161] Furthermore, in this light source device, the first optical component covers the side of the first light guide opposite to the wavelength conversion element. Therefore, the defective portion generated at the end of the first optical component does not communicate with the first light guide located between the first support and the second support. Thus, a portion of the second light propagating within the first light guide is suppressed from incident on the defective portion and becoming light loss, thereby further improving the light utilization efficiency of the second light.

[0162] (Postscript 2)

[0163] According to the light source device described in Appendix 1, the first optical component includes: a first transparent substrate that transmits the first light; and a first optical layer disposed on the surface of the first transparent substrate on the side of the wavelength conversion element, which transmits the first light and reflects the second light.

[0164] According to this structure, by forming the first optical layer on the flat first light-transmitting member, the first optical layer can be formed as a flat film. Furthermore, the second light does not incident on the first light-transmitting member but is reflected by the first optical layer, thus suppressing the loss caused by the propagation of the second light within the first light-transmitting member.

[0165] (Note 3)

[0166] According to the light source device described in Appendix 1 or 2, the first light guide portion includes a first light-transmitting member disposed on the first surface of the wavelength conversion element, transmitting the first light and the second light.

[0167] The second light, converted by the wavelength conversion element, propagates inside the first light-transmitting component and exits from the end face of the third surface side of the first light-transmitting component.

[0168] According to this structure, the refractive index difference between the wavelength conversion element and the light guide is small, and the critical angle at the interface between the wavelength conversion element and the light guide is reduced. Therefore, it is easy to extract the second light generated by the wavelength conversion element to the first light guide, and losses caused by the reabsorption of the second light can be suppressed. This structure can be formed.

[0169] (Note 4)

[0170] According to the light source device described in Appendix 3, the first light guide further includes an air layer disposed between the first light-transmitting component and the first optical component, wherein the second light converted by the wavelength conversion element propagates inside the first light-transmitting component and within the air layer, and is emitted from the end face of the third surface side of the first light-transmitting component and the region of the third surface side of the air layer.

[0171] According to this structure, the second light is refracted when emitted from the first transparent component, and therefore travels in a direction at a small angle to the length direction of the wavelength conversion element. Furthermore, on the third surface side, the air layer is open to the outside and does not have a refractive index interface; therefore, the second light reaching the region on the third surface side is not reflected or refracted and is emitted directly into the external space. Thus, the extraction efficiency of the second light can be improved.

[0172] (Note 5)

[0173] According to the light source device described in Appendix 3 or 4, the first light-transmitting component and the first surface of the wavelength conversion element are fixed by a light-transmitting adhesive.

[0174] According to this structure, the first light-transmitting component is bonded to the wavelength conversion element, therefore, there is no air layer between the first light-transmitting component and the wavelength conversion element. Therefore, the second light emitted from the wavelength conversion element is less likely to undergo total internal reflection at the interface with the first light-transmitting component, thus efficiently entering the first light-transmitting component. Therefore, the first light guide can efficiently capture the second light.

[0175] (Note 6)

[0176] According to the light source device described in Appendix 3 or 4, the refractive index of the first light-transmitting component is less than the refractive index of the wavelength conversion element.

[0177] According to this structure, when the second light is incident from the wavelength conversion element onto the first transparent component, the second light is refracted, thereby reducing the angle between the second light and the long axis of the first transparent component. That is, the second light propagating within the first transparent component is incident at a small angle relative to the surface orthogonal to the long axis. Therefore, the first transparent component can efficiently extract the second light from the end face on the third surface side.

[0178] (Note 7)

[0179] The light source device according to any one of Annexes 1 to 6, wherein the light source device further comprises: a frame housing the wavelength conversion element, the first optical component, and the support component; and a pressing component disposed between the first optical component and the frame, pressing the first optical component against the support component.

[0180] According to this structure, the first optical component abuts against the support component, thereby enabling it to effectively cover the side of the first light guide portion opposite to the wavelength conversion element.

[0181] (Postscript 8)

[0182] The light source device according to any one of Appendices 1 to 7, wherein the light source device further comprises a frame housing the wavelength conversion element, the first optical component and the support component, the frame having an outlet for extracting the second light emitted from the region on the third surface side of the first light guide to the outside, wherein the outlet overlaps with the first light guide and the wavelength conversion element when viewed along the normal direction of the third surface of the wavelength conversion element.

[0183] According to this structure, the first optical component, the first light guide, the wavelength conversion element and the first reflective component can be protected by the frame, and the second light propagating inside the first light guide can be taken out as illumination light through the outlet of the frame to the outside.

[0184] (Note 9)

[0185] According to any one of Appendices 1 to 8, the light source device further comprises a second reflecting member and a third reflecting member that reflect the first light and the second light, the second reflecting member being disposed on a surface in the first support portion opposite to the region of the fourth surface of the wavelength conversion element and the fourth surface side of the first light guide portion, and the third reflecting member being disposed on a surface in the second support portion opposite to the region of the fifth surface of the wavelength conversion element and the fifth surface side of the first light guide portion.

[0186] According to this structure, the conversion efficiency from the first light to the second light can be improved by using the second and third reflective components. In addition, the loss of each light caused by light emitted from the fourth and fifth surfaces and absorbed by the frame can be suppressed.

[0187] (Postscript 10)

[0188] The light source device according to any one of Appendices 1 to 9, wherein the wavelength conversion element is composed of a transparent phosphor.

[0189] According to this structure, even when using a wavelength conversion element made of a transparent phosphor, it is possible to realize a light source device that efficiently extracts the second light from the third surface side of the first light guide to the outside.

[0190] (Postscript 11)

[0191] The light source device according to any one of Appendices 1 to 9, wherein the wavelength conversion element is composed of a phosphor with light scattering properties.

[0192] According to this structure, the direction of travel of the second light changes in various directions due to the scattering of light by the wavelength conversion element, allowing it to propagate inside the first light guide section and be efficiently emitted from the region on the third surface. Therefore, the loss of the second light can be suppressed, further improving the light extraction efficiency of the second light.

[0193] (Postscript 12)

[0194] According to the light source device described in Appendix 10, the wavelength conversion element comprises a yellow phosphor, the first light is blue light, the second light is yellow fluorescence, and the first light guide comprises: a first light-transmitting member disposed on the first surface of the wavelength conversion element, transmitting the first light and the second light; and an air layer disposed between the first light-transmitting member and the first optical member, wherein the fluorescence propagates within the first light-transmitting member and the air layer while being repeatedly reflected by at least one of the wavelength conversion element, the first optical member, and the surface of the first light-transmitting member in contact with the air layer, and is emitted from the end face of the third surface of the first light-transmitting member and the region of the third surface of the air layer.

[0195] According to this structure, the yellow fluorescence generated by the wavelength conversion element can be efficiently extracted from the region on the third side of the first light guide section.

[0196] (Postscript 13)

[0197] According to the light source device described in Appendix 11, the wavelength conversion element comprises a yellow phosphor, the first light is blue light, the second light is yellow fluorescence, and the first light guide comprises: a first light-transmitting member disposed on the first surface of the wavelength conversion element, transmitting the first light and the second light; and an air layer disposed between the first light-transmitting member and the first optical member, wherein the fluorescence propagates within the first light-transmitting member and the air layer while being repeatedly scattered by the wavelength conversion element, reflected by the first optical member, and reflected by the surface of the first light-transmitting member in contact with the air layer, and is emitted from the end face of the third surface of the first light-transmitting member and the region of the third surface of the air layer.

[0198] Based on this structure, fluorescence can be scattered through a wavelength conversion element.

[0199] (Postscript 14)

[0200] According to any one of Appendices 1 to 13, the light source device further comprises: a second light source disposed on the side opposite to the first light source relative to the wavelength conversion element, emitting the first light; a second optical component disposed between the second light source and the wavelength conversion element, transmitting the first light and reflecting the second light; and a second light guide disposed between the wavelength conversion element and the second optical component, guiding the second light converted by the wavelength conversion element, wherein the second light converted by the wavelength conversion element travels in the second light guide and is emitted from the region on the third surface side of the second light guide, the second optical component abutting against the first support portion and the second support portion, and covering the side of the second light guide disposed between the first support portion and the second support portion opposite to the wavelength conversion element.

[0201] According to this structure, the second light generated by the wavelength conversion element travels in the second light guide section and exits from the region on the third surface side of the second light guide section, thus further improving the light utilization efficiency of the second light. Furthermore, since the second optical component covers the side of the second light guide section opposite to the wavelength conversion element, the defective portion generated at the end of the second optical component does not communicate with the second light guide section located between the first support section and the second support section. Therefore, a portion of the second light propagating within the second light guide section is suppressed from incident on the defective portion and becoming light loss, thus further improving the light utilization efficiency of the second light.

[0202] (Postscript 15)

[0203] A projector comprising: a light source device as described in any one of Annexes 1 to 14; a light modulation device for modulating light emitted from the light source device; and a projection optics device for projecting light modulated by the light modulation device.

[0204] The projector based on this structure has a light source device that efficiently extracts light, thus providing a projector with excellent light utilization efficiency.

Claims

1. A light source device, comprising: a first light source that emits first light of a first wavelength band; a wavelength conversion element that converts the first light into second light of a second wavelength band different from the first wavelength band; a first optical member that is disposed between the first light source and the wavelength conversion element, transmits the first light, and reflects the second light; a first light guide portion that is disposed between the wavelength conversion element and the first optical member, and guides the second light converted by the wavelength conversion element; a first reflecting member that reflects the first light and the second light; and a support member that supports the wavelength conversion element, wherein the wavelength conversion element has a first surface into which the first light is incident via the first optical member and the first light guide portion, a second surface and a third surface that cross the first surface and face opposite sides of each other, and a fourth surface and a fifth surface that cross the first surface, the second surface, and the third surface and face opposite sides of each other, wherein the first reflecting member is disposed in a region on the second surface side of the wavelength conversion element and on the second surface side of the first light guide portion, wherein the second light converted by the wavelength conversion element travels in the first light guide portion and is emitted from a region on the third surface side of the first light guide portion, wherein the support member has a first support portion that supports the fourth surface of the wavelength conversion element, and a second support portion that supports the fifth surface of the wavelength conversion element, and wherein the first optical member abuts against the first support portion and the second support portion, and covers a side of the first light guide portion opposite the wavelength conversion element, which is disposed between the first support portion and the second support portion.

2. The light source device according to claim 1, wherein the first optical member has: a first transparent substrate that transmits the first light; and a first optical layer that is provided on a surface of the first transparent substrate on the wavelength conversion element side, transmits the first light, and reflects the second light.

3. The light source device according to claim 1, wherein the first light guide portion includes a first light-transmissive member that is disposed on the first surface of the wavelength conversion element, transmits the first light and the second light, and wherein the second light converted by the wavelength conversion element propagates inside the first light-transmissive member and is emitted from an end surface on the third surface side of the first light-transmissive member.

4. The light source device according to claim 3, wherein the first light guide portion further includes an air layer that is provided between the first light-transmissive member and the first optical member, and wherein the second light converted by the wavelength conversion element propagates inside the first light-transmissive member and in the air layer, and is emitted from an end surface on the third surface side of the first light-transmissive member and a region on the third surface side of the air layer.

5. The light source device according to claim 3, wherein the first light-transmissive member and the first surface of the wavelength conversion element are fixed by a light-transmissive adhesive.

6. The light source device according to claim 3, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The first light-transmissive member has a refractive index smaller than a refractive index of the wavelength conversion element.

7. The light source device according to any one of claims 1 to 6, wherein The light source device further has: a frame that houses the wavelength conversion element, the first optical member, and the support member; and a pressing member that is disposed between the first optical member and the frame and presses the first optical member against the support member.

8. The light source device according to any one of claims 1 to 6, wherein The light source device further has a frame that houses the wavelength conversion element, the first optical member, and the support member, the frame has an extraction port that extracts the second light, which is emitted from a region on the third face side of the first light guide, to the outside, the extraction port overlaps the first light guide and the wavelength conversion element in a state viewed in a normal direction of the third face of the wavelength conversion element.

9. The light source device according to any one of claims 1 to 6, wherein The light source device further has a second reflection member and a third reflection member that reflect the first light and the second light, the second reflection member is provided to a face of the first support member that opposes the fourth face of the wavelength conversion element and a region on the fourth face side of the first light guide, the third reflection member is provided to a face of the second support member that opposes the fifth face of the wavelength conversion element and a region on the fifth face side of the first light guide.

10. The light source device according to any one of claims 1 to 6, wherein The wavelength conversion element is composed of a transparent phosphor.

11. The light source device according to any one of claims 1 to 6, wherein The wavelength conversion element is composed of a phosphor having light scattering properties.

12. The light source device according to claim 10, wherein The wavelength conversion element contains a yellow phosphor, the first light is blue light, the second light is yellow fluorescent light, the first light guide contains: a first light-transmissive member that is disposed on the first face of the wavelength conversion element and transmits the first light and the second light; and an air layer that is disposed between the first light-transmissive member and the first optical member, The fluorescent light repeatedly performs at least one of reflection of the wavelength conversion element, reflection of the first optical member, and reflection of a face of the first light-transmissive member that is in contact with the air layer, while propagating inside the first light-transmissive member and the air layer, and is emitted from an end face on the third face side of the first light-transmissive member and a region on the third face side of the air layer.

13. The light source device according to claim 11, wherein The wavelength conversion element contains a yellow phosphor, the first light is blue light, the second light is yellow fluorescent light, the first light guide contains: a first light-transmitting member disposed on the first surface of the wavelength conversion element and transmitting the first light and the second light, and an air layer disposed between the first light-transmitting member and the first optical member, the fluorescent light repeatedly performing at least one of scattering by the wavelength conversion element, reflection by the first optical member, and reflection by the surface of the first light-transmitting member in contact with the air layer, propagating inside the first light-transmitting member and the air layer, and exiting from the end surface on the third surface side of the first light-transmitting member and the region on the third surface side of the air layer.

14. The light source device according to any one of claims 1 to 6, wherein the light source device further has: a second light source disposed on the side opposite to the first light source with respect to the wavelength conversion element and emitting the first light; a second optical member disposed between the second light source and the wavelength conversion element, transmitting the first light and reflecting the second light; and a second light guide disposed between the wavelength conversion element and the second optical member and guiding the second light converted by the wavelength conversion element, the second light converted by the wavelength conversion element travels in the second light guide and exits from the region on the third surface side of the second light guide, the second optical member abuts against the first support portion and the second support portion, and covers the side opposite to the wavelength conversion element of the second light guide disposed between the first support portion and the second support portion.

15. A projector having: the light source device according to any one of claims 1 to 6; a light modulation device that modulates the light emitted from the light source device; and a projection optical device that projects the light modulated by the light modulation device. ​ ​

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