Light source device, projector, wavelength conversion member, and light transmission member

Abstract

To provide a light source device that can prevent peeling of an angle conversion member, a projector, a wavelength conversion member, and a light transmission member.SOLUTION: A light source device comprises: a light guide body that has side faces extending in a first direction, and a first end face and a second end face intersecting the side faces and located on the opposite sides to each other; a light source that emits light to be incident on the light guide body; an angle conversion body that is joined to the first end face, and converts the angle of the light emitted from the first end face; and a holder that has a holding part holding the end faces and a stationary part fixed to the angle conversion body, and is arranged over a joint portion of the light guide body and the angle conversion body.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present disclosure relates to a light source device, a projector, a wavelength conversion member, and a light transmission member. [Background technology]

[0002] Conventionally, light source devices have been known that include a wavelength conversion device that converts the wavelength of light incident from a light source and outputs the converted light. As such light source devices, light source devices that include a long and thin columnar wavelength conversion body are known (see, for example, Patent Documents 1 and 2). The light source apparatus described in Patent Document 1 is an illumination device including a plurality of solid-state light sources, a luminescence concentrator, and a collimator. The luminescence concentrator has an elongated light-transmitting body, and the light-transmitting body contains a ceramic material that converts the wavelength of at least a portion of the source light emitted from the plurality of solid-state light sources. The light-transmitting body has first and second surfaces that define the length of the light-transmitting body, as well as a radiation incident surface that intersects the first and second surfaces. The plurality of solid-state light sources are arranged along the radiation incident surface and emit the source light to the radiation incident surface. The collimator is, for example, a compound parabolic concentrator (CPC), and is fixed to the second surface of the light-transmitting body. Such an illumination device converts the wavelength of the source light emitted from each of the plurality of solid-state light sources in the light-transmitting body, and emits the converted light from the collimator.

[0003] The light source device described in Patent Document 2 includes a light source unit, a wavelength conversion member, and an angle conversion member. The wavelength conversion member is configured in a quadrangular prism shape and has an emission end face, a reflection end face, and first to fourth side faces. The light source unit has a plurality of light-emitting elements arranged facing the first and second side faces of the wavelength conversion member, respectively, and emits excitation light to the first and second side faces. The wavelength conversion member converts the excitation light of a first wavelength band incident on the first and second side faces into fluorescence of a second wavelength band different from the first wavelength band, and emits the fluorescence from the emission end face to the angle conversion member. The angle conversion member is configured as a compound parabolic concentrator or a tapered rod, and is attached to the emission end face via an adhesive. The angle conversion member has a convex portion protruding toward the emission end face of the wavelength conversion member, and the convex portion increases the contact area with the adhesive, thereby increasing the bonding strength between the angle conversion member and the wavelength conversion member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2020-526877 [Patent Document 2] Japanese Patent Application Publication No. 2023-128282 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the light source device described in Patent Document 1, for example, the collimator, which is a compound parabolic concentrator, is fixed to the second surface of the light-transmitting body. However, because the contact area between the collimator and the second surface is small and the difference between the cross-sectional area of the collimator and the cross-sectional area of the light-transmitting body is large, the collimator is easily peeled off from the light-transmitting body due to external impact, etc. When the collimator peels off from the light-transmitting body, it becomes difficult to transmit light from the light-transmitting body to the collimator, resulting in a problem that the amount of light emitted from the collimator decreases relative to the amount of light emitted from the light source to the light-transmitting body.

[0006] In contrast, the light source device described in Patent Document 2 has a convex portion on the angle conversion member, but because the angle conversion member is small, it is difficult to sufficiently increase the contact area with the adhesive, even with the convex portion, and it is therefore difficult to obtain sufficient adhesive strength with the adhesive. Furthermore, because a small-diameter wavelength conversion member transmits high-density light to the angle conversion member, the temperature of the adhesive is likely to increase due to the incident light. This makes the adhesive more susceptible to deterioration, and the adhesive's bonding strength to the angle conversion member is likely to decrease. Furthermore, if the angle conversion member peels off from the wavelength conversion member, it becomes difficult to transmit fluorescence from the wavelength conversion member to the angle conversion member, which, as described above, causes a problem in that the amount of fluorescence emitted from the angle conversion member decreases relative to the amount of light emitted to the wavelength conversion member. Due to these problems, there has been a demand for a configuration that can prevent the angle conversion member from peeling off. [Means for solving the problem]

[0007] A light source device according to a first aspect of the present disclosure comprises a light guide having a side extending in a first direction and first and second end faces that intersect the side faces and are positioned opposite each other; a light source that emits light that is incident on the light guide; an angle converter that is joined to the first end face and converts the angle of the light emitted from the first end face; and a holder that has a holding portion that holds the side faces and a fixing portion that is fixed to the angle converter, and is positioned across the joint between the light guide and the angle converter.

[0008] A projector according to a second aspect of the present disclosure includes a light source device according to the first aspect, an image forming device that modulates light emitted from the light source device to form image light, and a projection optical device that projects the image light.

[0009] A wavelength conversion member according to a third aspect of the present disclosure comprises a wavelength converter having a side extending in a first direction, and first and second end faces that intersect the side faces and are located opposite each other, and emitting converted light that converts the wavelength of incident excitation light, an angle converter joined to the first end face and converts the angle of light emitted from the first end face, a holder having a holding portion that holds the side faces and a fixing portion that is fixed to the angle converter, and is positioned across the joint between the wavelength converter and the angle converter.

[0010] An optical transmission component according to a fourth aspect of the present disclosure comprises a light guide having a side extending in a first direction, and first and second end faces that intersect the side face and are located on opposite sides of each other, wherein light is incident on the side face; an angle converter joined to the first end face and converts the angle of light emitted from the first end face; a holder having a holding portion that holds the side face and a fixing portion that is fixed to the angle converter, and arranged across the joint between the light guide and the angle converter. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a projector according to a first embodiment. [Figure 2] FIG. 1 is a perspective view showing a light source device according to a first embodiment. [Figure 3] FIG. 1 is a perspective view showing a light source device according to a first embodiment. [Figure 4] FIG. 1 is a side view showing a fluorescent light emitting device according to a first embodiment. [Figure 5] FIG. 1 is a side view showing a fluorescent light emitting device according to a first embodiment. [Figure 6] FIG. 1 is an exploded perspective view showing a fluorescent light emitting device according to a first embodiment. [Figure 7] 3A and 3B are six-sided views showing the light output member according to the first embodiment. [Figure 8] FIG. 3 is a plan view showing the light output member from which the first holding member according to the first embodiment has been removed. [Figure 9] FIG. 3 is a rear view showing the angle converter according to the first embodiment. [Figure 10]FIG. 3 is a diagram showing the optical paths of fluorescence emitted from the light guide and the angle converter according to the first embodiment. [Figure 11] FIG. 2 is a perspective view showing a first holding member according to the first embodiment. [Figure 12] FIG. 3 is a perspective view showing a second holding member according to the first embodiment. [Figure 13] FIG. 2 is a cross-sectional view showing the light output member according to the first embodiment. [Figure 14] FIG. 2 is a cross-sectional view showing the light output member according to the first embodiment. [Figure 15] FIG. 2 is a cross-sectional view showing the light output member according to the first embodiment. [Figure 16] FIG. 1 is an exploded perspective view showing a light source device according to a first embodiment. [Figure 17] FIG. 1 is an exploded perspective view showing a light source device according to a first embodiment. [Figure 18] FIG. 2 is a perspective view showing a base according to the first embodiment. [Figure 19] FIG. 2 is a plan view showing the base according to the first embodiment. [Figure 20] FIG. 3 is a cross-sectional view showing the base according to the first embodiment. [Figure 21] FIG. 1 is a cross-sectional view showing a light source device according to a first embodiment. [Figure 22] FIG. 1 is a cross-sectional view showing a light source device according to a first embodiment. [Figure 23] FIG. 1 is a cross-sectional view showing a light source device according to a first embodiment. [Figure 24] FIG. 10 is a perspective view showing a part of a light output member that configures a light source device provided in a projector according to a second embodiment. [Figure 25] FIG. 11 is an exploded perspective view showing a part of a light output member that configures a light source device provided in a projector according to a third embodiment. [Figure 26] FIG. 10 is a perspective view showing a holder according to a third embodiment. [Figure 27] FIG. 10 is a diagram showing a light output member that configures a light source device provided in a projector according to a fourth embodiment. [Figure 28] FIG. 13 is a cross-sectional view showing a light output member that configures a light source device provided in a projector according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] [First embodiment] Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. [Projector configuration] FIG. 1 is a schematic diagram showing the configuration of a projector 1 according to this embodiment. The projector 1 according to this embodiment is a display device that modulates light emitted from a light source to form image light, and enlarges and projects the formed image light onto a projection surface SC such as a screen. As shown in Fig. 1, the projector 1 includes an exterior housing 11 that forms the exterior of the projector 1, and an image projection device 2 that is housed within the exterior housing 11. In addition, although not shown, the projector 1 also includes a control device that controls the operation of the projector 1, a cooling device that cools an object to be cooled, and a power supply device that supplies power to the electronic components that make up the projector 1.

[0013] [Configuration of image projection device] The image projection device 2 projects image light according to image information under the control of the control device. The image projection device 2 includes an illumination device 21, a color separation optical system 24, a reflecting mirror 25, a collimating lens 26, a light modulation device 27, a color synthesis device 28, and a projection optical device 29. The illumination device 21 includes a first illumination device 22 that emits fluorescence YL containing green light GL and red light RL, and a second illumination device 23 that emits blue light BL.

[0014] [Configuration of the first lighting device] The first illumination device 22 irradiates the color separation optical system 24 with the fluorescence YL. The first illumination device 22 includes a light source device 3A, a collimating optical system 221, an integrator optical system 222, a polarization conversion element 223, and a superimposing optical system 224. The light source device 3A emits fluorescent light YL. The configuration of the light source device 3A will be described in detail later.

[0015] The collimating optical system 221 collimates the fluorescence YL emitted from the light source device 3A. The integrator optical system 222 homogenizes the illuminance distribution of the fluorescence YL incident from the light source device 3A via the collimating optical system 221. In this embodiment, the integrator optical system 222 is composed of a first lens array 2221 and a second lens array 2222. Although detailed illustration is omitted, the first lens array 2221 has a plurality of first lenses arranged in a matrix, and the second lens array 2222 has a plurality of second lenses corresponding to the plurality of first lenses. The first lens array 2221 splits the fluorescence YL incident from the collimating optical system 221 into a plurality of partial beams, and the plurality of partial beams pass through corresponding ones of the plurality of second lenses. The integrator optical system 222 may be composed of a rod integrator. The polarization conversion element 223 receives the plurality of partial light beams emitted from the second lens array 2222. That is, the fluorescence YL is incident on the polarization conversion element 223. The polarization conversion element 223 converts the incident fluorescence YL into one type of linearly polarized light and emits it. The superimposing optical system 224 superimposes the partial beam of green light GL, of the multiple partial beams incident via the polarization conversion element 223, onto the modulation area of the green light modulation device 27G, and superimposes the partial beam of red light RL onto the modulation area of the red light modulation device 27R. The fluorescence YL emitted from the superimposing optical system 224 is incident on the color separation optical system 24.

[0016] [Configuration of the second lighting device] The second illumination device 23 irradiates the reflecting mirror 25 with blue light BL. The second illumination device 23 includes a blue light source 231, a condensing element 232, a homogenizing device 233, and a relay lens 236. The blue light source 231 has at least one light emitting element that emits blue light BL. The light collecting element 232 collects the blue light BL emitted from the blue light source 231 onto the homogenizer 233. The light collecting element 232 has a plurality of lenses 2321 and 2322, for example. The homogenizer 233 homogenizes the illuminance distribution of the blue light BL incident from the light collecting element 232. In this embodiment, the homogenizer 233 has a diffuser 234 and a rod integrator 235. The relay lens 236 relays the blue light BL incident from the homogenizer 233 to the reflecting mirror 25 .

[0017] [Configuration of color separation optical system and reflecting mirror] The color separation optical system 24 separates the fluorescence YL incident from the first illumination device 22 into green light GL and red light RL, and guides the green light GL to the green light modulation device 27G and the red light RL to the red light modulation device 27R. The color separation optical system 24 includes a dichroic mirror 241 and reflecting mirrors 242 and 243. The dichroic mirror 241 separates the fluorescence YL incident from the first illumination device 22 into green light GL and red light RL. The reflecting mirror 242 reflects the green light GL reflected by the dichroic mirror 241 toward the green light modulation device 27G. The reflecting mirror 243 reflects the red light RL transmitted through the dichroic mirror 241 toward the red light modulation device 27R. The reflecting mirror 25 reflects the blue light BL incident from the second illumination device 23 toward the blue light modulation device 27B.

[0018] [Configuration of collimating lens] The collimating lens 26 is a field lens that collimates incident light, and includes a blue collimating lens 26B, a green collimating lens 26G, and a red collimating lens 26R. The blue collimating lens 26B is provided in the optical path of the blue light BL between the reflecting mirror 25 and the blue light modulation device 27B. The blue collimating lens 26B collimates the blue light BL incident on the blue light modulation device 27B. The green collimating lens 26G is provided in the optical path of the green light GL between the reflecting mirror 242 and the green light modulation device 27G. The green collimating lens 26G collimates the green light GL incident on the green light modulation device 27G. The red collimating lens 26R is provided in the optical path of the red light RL between the reflecting mirror 243 and the red light modulation device 27R. The red collimating lens 26R collimates the green light GL incident on the red light modulation device 27R.

[0019] [Configuration of optical modulation device] The light modulation device 27 is an image forming device that modulates incident light in accordance with image information. The light modulation device 27 includes a blue light modulation device 27B that modulates blue light BL, a green light modulation device 27G that modulates green light GL, and a red light modulation device 27R that modulates red light RL. In this embodiment, each of the light modulation devices 27B, 27G, and 27R is configured by a transmissive liquid crystal panel and a pair of polarizing plates sandwiching the liquid crystal panel. That is, the light modulation device 27 is a transmissive liquid crystal light valve.

[0020] [Color synthesis device and projection optical device] The color light beams BL, GL, and RL modulated by the light modulators 27R, 27G, and 27B are incident on the color combiner 28. The color combiner 28 combines the color light beams BL, GL, and RL incident thereon to generate image light that is projected by the projection optical device 29. In this embodiment, the color combiner 28 is configured with a cross dichroic prism, but may also be configured with multiple dichroic mirrors. The projection optical device 29 projects the image light combined by the color combining device 28 onto the projection surface SC through the projection opening 111 of the exterior housing 11. That is, the projection optical device 29 projects light modulated by the light modulation device 27. An example of the projection optical device 29 is a lens assembly having a plurality of lenses and a cylindrical lens barrel in which the plurality of lenses are housed.

[0021] [Light source configuration] FIG. 2 is a perspective view showing the light source device 3A as seen from the emission side of the fluorescent light YL, and FIG. 3 is a perspective view showing the light source device 3A as seen from the opposite side to the emission side of the fluorescent light YL. As shown in FIGS. 2 and 3, the light source device 3A includes a fluorescent light emitting device 4A and a housing 7 that accommodates the fluorescent light emitting device 4A. In the following description, the three mutually orthogonal directions are referred to as the +X direction, +Y direction, and +Z direction. In this embodiment, the +Z direction is the direction in which the light source device 3A emits fluorescence YL, and the +Y direction is the direction in the housing 7 in which the cover members 74 and 75 are located relative to a base 71 (described later). The +X direction is the right direction when viewed from the +Z direction with the +Y direction facing upward. Although not shown in the drawings, the direction opposite the +X direction is referred to as the -X direction, the direction opposite the +Y direction is referred to as the -Y direction, and the direction opposite the +Z direction is referred to as the -Z direction. Furthermore, the axis along the +X direction is referred to as the X axis, the axis along the +Y direction is referred to as the Y axis, and the axis along the +Z direction is referred to as the Z axis.

[0022] [Configuration of the fluorescence emission device] Fig. 4 is a side view showing the fluorescent light emitter 4A seen from the +X direction. Fig. 5 is a side view showing the fluorescent light emitter 4A seen from the +X direction in a state where the first holding member 66 and the second holding member 67 of the holder 65 are spaced apart. Fig. 6 is an exploded perspective view showing the fluorescent light emitter 4A seen from the -Z direction in a state where the first holding member 66 and the second holding member 67 are spaced apart. The fluorescent light emitting device 4A is accommodated in a housing 7 and emits fluorescent light YL. As shown in FIGS. 4 to 6, the fluorescent light emitting device 4A includes a light source section 5 and a light emitting member 6A.

[0023] [Light source configuration] The light source unit 5 emits light to a light guide 61 (described later) of the light output member 6A. In this embodiment, the light source unit 5 emits excitation light to the light guide 61, which excites the phosphor contained in the light guide 61. The light source unit 5 is disposed in the +Y direction with respect to the light guide 61. The light source unit 5 has a substrate 51, a light source 52 mounted on the substrate 51, and a connector 53. The substrate 51 is disposed on the opposite side of the housing 7 from a base 71 (described later) across the light guide 61, covers the light guide 61, and is fixed to the base 71. The substrate 51 has a first surface 51A facing the +Y direction and a second surface 51B facing the -Y direction. When the substrate 51 is fixed to the base 71, the first surface 51A forms the outer surface of the light source device 3A. The second surface 51B is the surface opposite to the first surface 51A. A light source 52 and a connector 53 are mounted on the second surface 51B.

[0024] The light source 52 emits excitation light in the -Y direction. The light source 52 is configured with at least one light-emitting element 521 arranged along the Z axis, and the light emission surface of the light-emitting element 521 faces a first side surface 611 (described later) of the light guide 61. That is, the plurality of light-emitting elements 521 emit excitation light that is incident on the first side surface 611. The excitation light emitted by the light-emitting element 521 is light in a first wavelength band of, for example, 400 nm to 480 nm, and the peak wavelength of the excitation light is, for example, 445 nm. In this embodiment, the light-emitting element 521 is an LED (Light Emitting Diode) element, but may be another light-emitting element such as an LD (Laser Diode) element. The connector 53 is provided on the second surface 51B at a position in the −X direction relative to the light source 52. Electric power for lighting the light emitting element 521 is supplied to the connector 53 from an external source.

[0025] [Configuration of light output member] Fig. 7 is a six-view diagram showing the light output member 6A. More specifically, Fig. 7(A) is a front view showing the light output member 6A as viewed from the +Z direction, Fig. 7(B) is a plan view showing the light output member 6A as viewed from the +Y direction, Fig. 7(C) is a rear view showing the light output member 6A as viewed from the -Z direction, Fig. 7(D) is a side view showing the light output member 6A as viewed from the +X direction, Fig. 7(E) is a side view showing the light output member 6A as viewed from the -X direction, and Fig. 7(F) is a bottom view showing the light output member 6A as viewed from the -Y direction. Note that the directions included in the names of the figures do not limit the direction in which the light output member 6A is arranged. The light output member 6A has a function of guiding light based on the light output from the light source unit 5 to the outside of the light source device 3A. In this embodiment, the light output member 6A converts the wavelength of the excitation light output from the light source unit 5 to generate fluorescence YL, and then guides the fluorescence YL to the outside of the light source device 3A. In other words, the light output member 6A is a wavelength conversion member and a light transmission member. As shown in FIGS. 5 to 7, the light output member 6A includes a light guide 61, a reflecting element 62, an angle converter 63, an adhesive 64, and a holder 65.

[0026] [Light guide configuration] The light guide 61 is a light emitting member into which excitation light from the light emitting element 521 is incident along the -Y direction. The light guide 61 emits light based on the incident excitation light in the +Z direction intersecting the -Y direction. In this embodiment, the light guide 61 contains a phosphor that is excited by the incident excitation light. The light guide 61 generates fluorescence YL having a wavelength different from that of the incident excitation light and emits it in the +Z direction. In other words, the light guide 61 is a wavelength converter that converts the wavelength of the incident excitation light and emits the fluorescence YL. The phosphor contained in the light guide 61 can be, for example, a YAG-based phosphor containing yttrium, aluminum, and garnet. 5 to 7, the light guide 61 has a first side surface 611, a second side surface 612, a third side surface 613, a fourth side surface 614, a first end surface 615, and a second end surface 616, and is configured in a substantially rectangular prism shape that is long along the Z axis. The area of the cross section of the light guide 61 perpendicular to the Z axis is substantially constant along the Z axis, and is 0.25 mm 2 Over 4.00mm 2 The following is the result.

[0027] The side surfaces 611 to 614 extend along the Z axis. As shown in Figures 5 and 6, the first side surface 611 is an outer surface facing the +Y direction, and the third side surface 613 is an outer surface facing the -Y direction. As shown in Figure 6, the second side surface 612 is an outer surface facing the -X direction, and the fourth side surface 614 is an outer surface facing the +X direction. As shown in FIGS. 5 and 6, the first side surface 611 faces the light source 52 and includes an incident area onto which excitation light from the light source 52 is incident.

[0028] 7, the light guide 61 has four corners C1 to C4 formed by side surfaces 611 to 614. The first corner C1 is formed by a first side surface 611 and a second side surface 612 that intersect with each other, and the second corner C2 is formed by a third side surface 613 and a fourth side surface 614 that intersect with each other. The third corner C3 is formed by the second side surface 612 and the third side surface 613 that intersect with each other, and the fourth corner C4 is formed by the first side surface 611 and the fourth side surface 614 that intersect with each other. In other words, the second corner C2 is a diagonal to the first corner C1, and the fourth corner C4 is a diagonal to the third corner C3.

[0029] FIG. 8 is a plan view of the light output member 6A seen from the +Y direction in a state where the first holding member 66 that constitutes the holder 65 has been removed. 8, the first end face 615 and the second end face 616 are faces located on opposite sides of the Z axis, with the first end face 615 being an outer face facing the +Z direction and the second end face 616 being an outer face facing the -Z direction. Each of the first end face 615 and the second end face 616 intersects with each of the side faces 611 to 614. Each of the first end face 615 and the second end face 616 is square in shape. Reflecting element 62 is pressed against second end face 616 by biasing member 73, which will be described later. Light emitted from second end face 616 to the outside of light guide 61 is reflected by reflecting element 62 and enters light guide 61 through second end face 616, which will be described in detail later. The first end surface 615 is an emission surface that emits the fluorescence YL generated within the light guide 61. The angle converter 63 is bonded to the first end surface 615 with an adhesive 64.

[0030] [Angle converter configuration] Angle converter 63 is provided on first end surface 615. Angle converter 63 is a compound parabolic concentrator (CPC) and is configured in a substantially quadrangular pyramid shape using a light-transmitting material such as borosilicate glass and cycloolefin resin. As shown in FIGS. 5, 6, and 8, angle converter 63 has an incident end surface 631, an exit end surface 632, side surfaces 633, 634, 635, 636, and a flange 637.

[0031] 5 and 8, the incident end surface 631 is disposed opposite the first end surface 615 and is bonded to the first end surface 615 with an adhesive 64. The fluorescence YL emitted from the first end surface 615 is incident on the incident end surface 631. The exit end surface 632 is the surface opposite to the incident end surface 631. The exit end surface 632 emits the fluorescence YL that has entered the angle converter 63 from the incident end surface 631.

[0032] FIG. 9 is a rear view showing the angle converter 63 as viewed from the −Z direction. The four side surfaces 633 to 636 are outer surfaces that intersect with the incident end surface 631 and the emitting end surface 632, respectively, and extend in the circumferential direction around the optical axis Ax of the angle converter 63. Each of the side surfaces 633 to 636 is a parabolic curved surface. 9, the first side surface 633 faces the +Y direction, and the third side surface 635 faces the -Y direction. The second side surface 634 faces the -X direction, and the fourth side surface 636 faces the +X direction. The inner surfaces of the side surfaces 633 to 636 function as reflective surfaces that reflect the fluorescence YL that has entered the inside of the angle converter 63 via the incident end surface 631 toward the output end surface 632.

[0033] As shown in Figures 5 and 8, the cross-sectional area of the angle converter 63 perpendicular to the optical axis Ax, i.e., the cross-sectional area of the angle converter 63 perpendicular to the Z axis, increases from the incident end face 631 to the exit end face 632, and the area of the exit end face 632 is larger than the area of the incident end face 631. As shown in FIG. 8, the dimensions of the side surfaces 633 and 635 along the X axis increase from the incident end surface 631 toward the exit end surface 632. As shown in FIG. 5, the dimensions of the side surfaces 634 and 636 along the Y axis increase from the incident end surface 631 toward the exit end surface 632. The X-axis and Y-axis are axes that are perpendicular to the optical axis Ax of the angle converter 63 that is along the Z-axis. The optical axis Ax of the angle converter 63 passes through the center of each of the incident end face 631 and the exit end face 632 and is parallel to the Z-axis. The optical axis Ax of the angle converter 63 coincides with the optical axis of the first lighting device 22.

[0034] The flange 637 is a portion that protrudes radially outward from the light-emitting end of the angle converter 63, centered on the optical axis Ax, and the +Z-direction surface of the flange 637 coincides with the emitting end face 632. The flange 637 is provided in an area of the angle converter 63 through which the fluorescence YL that enters through the incident end face 631 and exits from the emitting end face 632 does not pass. In other words, the flange 637 protrudes radially outward from the optical axis Ax with respect to the area of the emitting end face 632 through which the fluorescence YL passes.

[0035] As shown in FIG. 9, the flange 637 has fixing regions 6371 to 6374 provided on a surface 63A of the flange 637 facing the −Z direction. The first fixed area 6371 is an area in the +Y direction on the surface 63A. The second fixed region 6372 is a region in the −X direction on the surface 63A. The third fixed region 6373 is a region in the −Y direction on the surface 63A. The fourth fixed region 6374 is a region in the +X direction on the surface 63A. The first fixing region 6371 and the second fixing region 6372 are fixed to the first holding member 66 of the holder 65 , and the third fixing region 6373 and the fourth fixing region 6374 are fixed to the second holding member 67 of the holder 65 .

[0036] [Adhesive composition] 5, 6, and 8, the adhesive 64 bonds the first end face 615 of the light guide 61 to the incident end face 631 of the angle converter 63. In this embodiment, the adhesive 64 is provided in the entire area between the first end face 615 and the incident end face 631. Here, of the fluorescence YL that enters the inner surface of the first end face 615 from inside the light guide 61, the fluorescence YL that enters at an angle equal to or greater than the critical angle is totally reflected by the inner surface of the first end face 615 and cannot enter the angle converter 63. In the region where a gap is provided between the first end face 615 and the incident end face 631, the critical angle is small, and therefore the amount of fluorescence YL that passes through the first end face 615 and enters the angle converter 63 is reduced. In contrast, if the adhesive 64 is provided in the entire region between the first end face 615 and the incident end face 631 and no gap exists between the first end face 615 and the incident end face 631, it is possible to prevent the critical angle from becoming smaller and reduce the amount of fluorescence YL that cannot enter the angle converter 63. In other words, if no gap exists between the first end face 615 and the incident end face 631, it is possible to make it easier for the fluorescence YL to enter the incident end face 631 from the first end face 615. From this viewpoint, it is desirable that the difference between the refractive index of the light guide 61 and the refractive index of the adhesive 64, and the difference between the refractive index of the adhesive 64 and the refractive index of the angle converter 63, are as small as possible.

[0037] In this embodiment, the light guide 61 is made of a material containing a YAG phosphor, and the angle converter 63 is made of a light-transmitting material such as borosilicate glass. The refractive index of the light guide 61 is approximately 1.8, and the refractive index of the angle converter 63 is 1.50 or more and 1.55 or less. This makes it difficult to match the refractive index of the light guide 61 with that of the angle converter 63. For this reason, it is preferable to make the difference between the refractive index of the angle converter 63 and that of the adhesive 64 as small as possible. When the angle converter 63 is made of borosilicate glass, the refractive index of the angle converter 63 is approximately 1.5. In contrast, if the adhesive 64 is made of a phenyl-based silicone resin adhesive and additives are added as necessary to appropriately adjust the refractive index of the adhesive 64, the refractive index of the adhesive 64 that joins the light guide 61 and the angle converter 63 can be made approximately 1.5. This reduces the difference between the refractive index of the angle converter 63 and the refractive index of the adhesive 64, making it easier for the fluorescence YL to enter the angle converter 63 from the light guide 61. The adhesive 64 has optical transparency because the fluorescence YL emitted from the first end face 615 needs to be incident on the incident end face 631. The adhesive 64 is preferably a phenyl-based silicone resin adhesive that is thermosetting or ultraviolet-curable, among phenyl-based silicone resin adhesives.

[0038] [Fluorescence emission by light guide and angle converter] FIG. 10 is a diagram showing a cross section of the fluorescence emitting device 4A along the YZ plane, and is a diagram showing the optical paths of the fluorescence YL emitted from the light guide 61 and the angle converter 63. 10 , when excitation light EL emitted from the light source 52 is incident on the first side surface 611 of the light guide 61, which is a wavelength converter, phosphors contained inside the light guide 61 are excited, and fluorescence YL is diffused and emitted from any light-emitting point. The fluorescence YL travels in all directions from any light-emitting point, and the fluorescence YL that has traveled toward the side surfaces 611 to 614 of the light guide 61 travels inside the light guide 61 toward the first end surface 615 or the second end surface 616 while repeatedly being totally reflected at multiple points on the inner surfaces of the side surfaces 611 to 614. The first end face 615 emits the fluorescence YL that has traveled inside the light guide 61. The fluorescence YL traveling toward the first end face 615 is emitted from the first end face 615 and enters the angle converter 63 via the adhesive 64. The fluorescence YL traveling toward the second end face 616 is reflected by the reflecting element 62, then enters the second end face 616 and travels toward the first end face 615.

[0039] Of the excitation light EL incident on the light guide 61, a portion of the excitation light EL that is not used to excite the phosphor is reflected by the surrounding members of the light guide 61, including the light emitting element 521 of the light source 52, or by the reflecting element 62 provided on the second end face 616. Therefore, a portion of the excitation light EL is trapped inside the light guide 61 and reused. The surrounding members of the light guide 61 include the inner surface of a first housing portion 711 of the base 71, which will be described later.

[0040] While the fluorescence YL incident on the angle converter 63 travels inside the angle converter 63, each time the fluorescence YL is totally reflected by the inner surfaces of the side surfaces 633 to 636, the traveling direction of the fluorescence YL changes so as to approach a direction parallel to the optical axis Ax of the angle converter 63. In this way, the angle converter 63 converts the emission angle distribution of the fluorescence YL emitted from the first end face 615 of the light guide 61. Specifically, the angle converter 63 makes the maximum emission angle of the fluorescence YL at the emission end face 632 smaller than the maximum incidence angle of the fluorescence YL at the incidence end face 631.

[0041] Generally, the etendue of light, which is defined as the product of the area of the light exit region and the solid angle (maximum exit angle) of the light, is preserved, and therefore the etendue of the fluorescence YL is preserved both before and after passing through the angle converter 63. As described above, the area of the exit end face 632 is larger than the area of the incident end face 631. For this reason, from the viewpoint of etendue preservation, the angle converter 63 can make the maximum exit angle of the fluorescence YL at the exit end face 632 smaller than the maximum incident angle of the fluorescence YL incident on the incident end face 631.

[0042] [Holder configuration] 8, the holder 65 is disposed across the joint between the light guide 61 and the angle converter 63, and holds the light guide 61 and the angle converter 63. In other words, the holder 65 covers the +Z direction ends of the side surfaces 611 to 614 of the light guide 61, the side surfaces 633 to 636 of the angle converter 63, and the adhesive 64, and fixes the angle converter 63 to the light guide 61. The holder 65 also has heat dissipation properties and dissipates heat transferred from, for example, the light guide 61 and the angle converter 63. Such a holder 65 can be made of metal or synthetic resin. As shown in FIGS. 5 to 7, the holder 65 has a first holding member 66 and a second holding member 67, and is configured by combining the first holding member 66 and the second holding member 67 with each other.

[0043] [Configuration of first holding member] FIG. 11 is a perspective view showing the first holding member 66 as seen from the +Z direction. The first holding member 66 is disposed in the +Y direction and the -X direction relative to the light guide 61 and the angle converter 63, and is connected to the second holding member 67. As shown in Fig. 11, the first holding member 66 is formed in a substantially right-angled isosceles triangular prism shape when viewed from the -Z direction or the +Z direction. The first holding member 66 has a first holding portion 661, a first fixing portion 662, a first cover portion 663, a first connecting surface 664, and a first recess 665.

[0044] The first holding portion 661 holds the first side surface 611 and the second side surface 612 of the light guide 61. That is, the first holding portion 661 is provided on a portion of the first holding member 66 corresponding to a portion of the light guide 61 that is further in the -Z direction than the first end face 615. The first holding portion 661 is configured as a recess having a first contact portion 6611 along the XZ plane and a second contact portion 6612 along the YZ plane.

[0045] The first contact portion 6611 comes into contact with the first side surface 611. The first contact portion 6611 is formed in a generally arc-like shape protruding in the -Y direction. More specifically, the first contact portion 6611 is formed in a frustum shape whose dimension along the +Z direction decreases as it protrudes in the -Y direction, and the surface of the tip of the first contact portion 6611 in the protruding direction is formed in an arc-like shape centered on an axis along the Z axis. Therefore, the first contact portion 6611 comes into line contact with the first side surface 611 along the Z axis. The second contact portion 6612 comes into contact with the second side surface 612. The second contact portion 6612 is formed in a generally arc-like shape protruding in the +X direction. More specifically, the second contact portion 6612 is formed in a frustum shape whose dimension along the +Z direction decreases as it protrudes in the +X direction, and the surface of the tip of the second contact portion 6612 in the protruding direction is formed in an arc-like shape centered on an axis along the Z axis. Therefore, the second contact portion 6612 comes into line contact with the second side surface 612 along the Z axis.

[0046] The first fixing portion 662 is a portion fixed to the angle converter 63, and is provided on a surface 66A facing the +Z direction of the first holding member 66. The first fixing portion 662 has a first fixing region 6621 and a second fixing region 6622. The first fixing region 6621 is located in the +Y direction on the surface 66A and extends along the X axis. The first fixing region 6621 is fixed to the first fixing region 6371 of the flange 637 with an adhesive. The second fixing region 6622 is located in the −X direction on the surface 66A and extends along the Y axis. The second fixing region 6622 is fixed to the second fixing region 6372 of the flange 637 with an adhesive.

[0047] The first cover portion 663 is a recess provided in the +Z direction relative to the first holding portion 661. The first cover portion 663 forms a space therein for accommodating the angle converter 63 when the first holding member 66 and the second holding member 67 are connected. The first cover portion 663 has a first inner surface 6631 along the XZ plane and a second inner surface 6632 along the YZ plane. The first inner surface 6631 faces the −Y direction and faces the first side surface 633 of the angle converter 63. The second inner surface 6632 faces the +X direction and faces the second side surface 634 of the angle converter 63.

[0048] The first connecting surface 664 faces the +X direction and the -Y direction and is inclined at approximately 45° with respect to each of the XZ plane and the YZ plane. A pair of first connecting surfaces 664 are provided with the first holding portion 661 and the first cover portion 663 sandwiched between them. That is, the first connecting surface 664 includes a first connecting region 6641 and a second connecting region 6642 located on the opposite side of the first connecting region 6641 with the first holding portion 661 and the first cover portion 663 sandwiched between them. The second connecting region 6642 is provided in the -Y direction with respect to the first connecting region 6641. When the first holding member 66 and the second holding member 67 are connected to each other, the first connecting surface 664 is bonded to a second connecting surface 674 (described later) of the second holding member 67 via an adhesive.

[0049] The first recess 665 is a recess provided in a portion of the first coupling surface 664 on the first holding portion 661 side, and together with a second recess 675 of the second holding member 67, constitutes adhesive escape portions 653, 654 described below. Two first recesses 665 are provided in the first holding member 66. The two first recesses 665 include a first recess 6651 provided in the portion of the first connecting region 6641 on the first holding portion 661 side, and a first recess 6652 provided in the portion of the second connecting region 6642 on the first holding portion 661 side.

[0050] [Configuration of second holding member] FIG. 12 is a perspective view showing the second holding member 67 as seen from the +Z direction. The second holding member 67 is connected to the first holding member 66 to hold the light guide 61 and fix the angle converter 63 to the light guide 61. As shown in Fig. 12 , the second holding member 67 has a structure that is line-symmetric with respect to the first holding member 66 about the optical axis Ax of the angle converter 63. In other words, the second holding member 67 is mirror-symmetric with respect to the first holding member 66. The second holding member 67 has a second holding portion 671, a second fixing portion 672, a second cover portion 673, a second connecting surface 674, and a second recess 675.

[0051] The second holding portion 671 holds the third side surface 613 and the fourth side surface 614 of the light guide 61. That is, the second holding portion 671 is provided at a position of the second holding member 67 corresponding to a portion of the light guide 61 that is further in the -Z direction than the first end face 615. The second holding portion 671 is configured as a recess having a third contact portion 6711 along the XZ plane and a fourth contact portion 6712 along the YZ plane.

[0052] The third contact portion 6711 comes into contact with the third side surface 613. The third contact portion 6711 is formed in a generally arc-like shape protruding in the +Y direction. More specifically, the third contact portion 6711 is formed in a frustum shape whose dimension along the +Z direction decreases as it protrudes in the +Y direction, and the surface of the tip of the third contact portion 6711 in the protruding direction is formed in an arc-like shape centered on an axis along the Z axis. Therefore, the third contact portion 6711 comes into line contact with the third side surface 613 along the Z axis. The fourth contact portion 6712 comes into contact with the fourth side surface 614. The fourth contact portion 6712 is formed in a generally arcuate shape protruding in the -X direction. More specifically, the fourth contact portion 6712 is formed in a frustum shape whose dimension along the +Z direction decreases as it protrudes in the -X direction, and the surface of the tip of the fourth contact portion 6712 in the protruding direction is formed in an arcuate shape centered on an axis along the Z axis. Therefore, the fourth contact portion 6712 comes into line contact with the fourth side surface 614 along the Z axis.

[0053] The second fixing portion 672 is a portion fixed to the angle converter 63, and is disposed on a surface 67A facing the +Z direction of the second holding member 67. The second fixing portion 672 has a third fixing region 6721 and a fourth fixing region 6722. The third fixing region 6721 is located in the −Y direction on the surface 67A and extends along the X axis. The third fixing region 6721 is fixed to the third fixing region 6373 of the flange 637 with an adhesive. The fourth fixing region 6722 is located in the +X direction on the surface 67A and extends along the Y axis. The fourth fixing region 6722 is fixed to the fourth fixing region 6374 of the flange 637 with an adhesive.

[0054] The second cover portion 673 is a recess provided in the +Z direction relative to the second holding portion 671. The second cover portion 673 forms a space therein for accommodating the angle converter 63 when the first holding member 66 and the second holding member 67 are combined. The second cover portion 673 has a third inner surface 6731 along the XZ plane and a fourth inner surface 6732 along the YZ plane. The third inner surface 6731 is a surface facing the +Y direction and faces the third side surface 635 of the angle converter 63. The fourth inner surface 6732 faces the −X direction and faces the fourth side surface 636 of the angle converter 63.

[0055] The second connecting surfaces 674 face in the -X direction and the +Y direction and are inclined at approximately 45° with respect to each of the XZ plane and the YZ plane. A pair of second connecting surfaces 674 are provided with the second holding portion 671 and the second cover portion 673 sandwiched between them. That is, the second connecting surfaces 674 include a third connecting region 6741 and a fourth connecting region 6742 located on the opposite side of the third connecting region 6741 with the second holding portion 671 and the second cover portion 673 sandwiched between them. The fourth connecting region 6742 is provided in the -Y direction with respect to the third connecting region 6741. The second connecting surface 674 is bonded to the first connecting surface 664 of the first holding member 66 via the adhesive 68. At this time, the third connecting region 6741 is bonded to the first connecting region 6641, and the fourth connecting region 6742 is bonded to the second connecting region 6642. In other words, when the first holding member 66 and the second holding member 67 are connected, the first connecting surface 664 and the second connecting surface 674 face each other and are parallel to each other. Note that the adhesive 68 bonding the first connecting surface 664 and the second connecting surface 674 can be made of a light-transmitting adhesive, similar to the adhesive 64.

[0056] The second recess 675 is a recess provided in a portion of the second coupling surface 674 on the second holding portion 671 side, and together with the first recess 665 of the first holding member 66, constitutes adhesive escape portions 653, 654 described below. Two second recesses 675 are provided in the second holding member 67. The two second recesses 675 include a second recess 6751 provided in a portion of the third connecting region 6741 on the second holding portion 671 side, and a second recess 6752 provided in a portion of the fourth connecting region 6742 on the second holding portion 671 side. As will be described in detail later, the second recess 6751 forms the adhesive escape portion 653 together with the first recess 6651, and the second recess 6752 forms the adhesive escape portion 654 together with the first recess 6652.

[0057] [Fixing the angle converter to the light guide using a holder] 13 is a diagram showing a cross section of the light output member 6A along the XZ plane, in other words, a cross section taken along line XIII-XIII in FIG. As described above, holder 65 is configured by combining first holding member 66 and second holding member 67. More specifically, as shown in Fig. 13, first holding member 66 and second holding member 67 are combined by bonding first connecting region 6641 and third connecting region 6741 with adhesive 68, and bonding second connecting region 6642 and fourth connecting region 6742. In this way, the first connecting region 6641 and the third connecting region 6741 are joined by the adhesive 68 to form a first connecting portion 651 that connects the first holding member 66 and the second holding member 67. Furthermore, the second connecting region 6642 and the fourth connecting region 6742 are joined by the adhesive 68 to form a second connecting portion 652 that connects the first holding member 66 and the second holding member 67. That is, the holder 65 includes connecting portions 651 and 652 that connect the first holding member 66 and the second holding member 67 with the first connecting surface 664 and the second connecting surface 674 facing each other.

[0058] When the first holding member 66 and the second holding member 67 are connected, an adhesive escape portion 653 is formed by the first recess 6651 of the first holding member 66 and the second recess 6751 of the second holding member 67, and an adhesive escape portion 654 is formed by the first recess 6652 of the first holding member 66 and the second recess 6752 of the second holding member 67. In other words, the holder 65 has the adhesive escape portions 653, 654. Each of the adhesive escape portions 653, 654 is a portion that prevents excess adhesive 68 from flowing into the light guide 61. The adhesive escape portion 653 is provided between the first connecting portion 651 and the light guide 61, and the adhesive escape portion 654 is provided between the second connecting portion 652 and the light guide 61. This is a widened portion between first connecting surface 664 and second connecting surface 674. More specifically, the distance between first connecting surface 664 and second connecting surface 674 in adhesive escape portion 653 is greater than the distance between first connecting surface 664 and second connecting surface 674 in connecting portion 651. Furthermore, the distance between first connecting surface 664 and second connecting surface 674 in adhesive escape portion 654 is greater than the distance between first connecting surface 664 and second connecting surface 674 in connecting portion 652.

[0059] FIG. 14 is a diagram showing a cross section of the light output member 6A along the YZ plane, and FIG. 15 is a diagram showing a cross section of the light output member 6A along the XZ plane. When the holder 65 is attached to the light guide 61 and the angle converter 63, as shown in Figures 14 and 15, the first holding portion 661 and the second holding portion 671 of the holder 65 hold the side surfaces 611 to 614 of the light guide 61, and the first fixing portion 662 and the second fixing portion 672 of the holder 65 are fixed to the flange 637 of the angle converter 63. In detail, as shown in Figure 14, the first contact portion 6611 of the first holding portion 661 makes line contact with the first side surface 611 of the light guide 61 along the Z axis, and the third contact portion 6711 of the second holding portion 671 makes line contact with the third side surface 613 of the light guide 61 along the Z axis. Note that first fixing region 6621 of first fixing portion 662 is fixed to first fixing region 6371 of flange 637 with adhesive, and third fixing region 6721 of second fixing portion 672 is fixed to third fixing region 6373 of flange 637 with adhesive.

[0060] Also, as shown in Figure 15, the second contact portion 6612 of the first holding portion 661 is in line contact with the second side surface 612 of the light guide 61 along the Z axis, and the fourth contact portion 6712 of the second holding portion 671 is in line contact with the fourth side surface 614 of the light guide 61 along the Z axis. The second fixing region 6622 of the first fixing portion 662 is fixed to the second fixing region 6372 of the flange 637 with an adhesive, and the fourth fixing region 6722 of the second fixing portion 672 is fixed to the fourth fixing region 6374 of the flange 637 with an adhesive. In this way, the holder 65, which is disposed across the adhesive 64 that forms the joint between the light guide 61 and the angle converter 63, can prevent the angle converter 63 from peeling off from the light guide 61. Furthermore, the holder 65 and the light guide 61 are in line contact at the contact portions 6611, 6612, 6711, and 6712, which reduces the contact area between the holder 65 and the light guide 61. This makes it possible to prevent the fluorescence YL and the excitation light EL from leaking out of the light guide 61.

[0061] [Housing configuration] FIG. 16 is an exploded perspective view showing light source device 3A as viewed from the +Z direction, and FIG. 17 is an exploded perspective view showing light source device 3A as viewed from the -Z direction. 2, 3, 16, and 17, the housing 7 supports the fluorescent light emitter 4A and accommodates the light emission member 6A of the fluorescent light emitter 4A therein. As shown in FIGS. 16 and 17, the housing 7 includes a base 71, two fixing members 72, a biasing member 73, a first cover member 74, and a second cover member 75.

[0062] [Base configuration] The base 71 supports the fluorescent light emitting device 4A from the -Y direction. That is, the light emitting member 6A is disposed on the base 71. In addition, a first cover member 74 and a second cover member 75 are fixed to the base 71. The base 71 is a metal body made of a metal such as aluminum, iron, or stainless steel, and has heat dissipation properties. The base 71 is formed in the shape of a rectangular plate that is long along the Z axis when viewed from the +Y direction. The base 71 has surfaces 71A, 71B, 71C, 71D, 71E, and 71F. In the base 71, the first surface 71A faces in the +Y direction, and the second surface 71B faces in the -Y direction. The second surface 71B is the surface opposite to the first surface 71A. In the base 71, the third surface 71C faces in the +Z direction, and the fourth surface 71D faces in the -Z direction. The fourth surface 71D is the surface opposite to the third surface 71C. In the base 71, the fifth surface 71E faces in the −X direction, and the sixth surface 71F faces in the +X direction. The sixth surface 71F is the surface opposite to the fifth surface 71E. In this way, the surfaces 71C, 71D, 71E, and 71F are surfaces that intersect with the first surface 71A and the second surface 71B, respectively.

[0063] Fig. 18 is a perspective view showing the base 71 as viewed from the +Y direction, and Fig. 19 is a plan view showing the base 71 as viewed from the +Y direction. Note that Figs. 18 and 19 show the base 71 in a state in which the light output member 6A is arranged. The base 71 further has a first accommodating portion 711, a second accommodating portion 712, a first recess 713, a second recess 714, an arrangement portion 715, and a third recess 716, and each of the portions 711 to 715 is provided on the first surface 71A.

[0064] [Configuration of the first storage section] 20 is a diagram showing a cross section of the base 71 along the XY plane in the first housing portion 711. In other words, FIG. 20 is a diagram showing a cross section of the base 71 taken along the line XX-XX in FIG. The first housing portion 711 houses the light guide 61. More specifically, the light guide 61 is fixed to the first housing portion 711 with the first side surface 611 exposed. The first housing portion 711 is a groove that extends linearly along the Z axis and opens in the +Y direction. More specifically, the first housing portion 711 is provided in the center of the first surface 71A in the X axis direction, and extends along the Z axis. As shown in FIG. 20, the first housing portion 711 has a support surface 7111, a first wall surface 7112, and a second wall surface 7115 as inner surfaces, and the cross section of the first housing portion 711 along the XY plane is substantially U-shaped.

[0065] The support surface 7111 faces the +Y direction and corresponds to the bottom surface of the first housing portion 711. When the light guide 61 is placed in the first housing portion 711, the support surface 7111 supports the third side surface 613. The first wall surface 7112 and the second wall surface 7115 intersect the support surface 7111 and face each other. The first wall surface 7112 faces the +X direction, and the second wall surface 7115 faces the -X direction. When the light guide 61 is placed in the first housing portion 711, the first wall surface 7112 faces the second side surface 612, and the second wall surface 7115 faces the fourth side surface 614. A gap is provided between the first wall surface 7112 and the second side surface 612, and a gap is provided between the second wall surface 7115 and the fourth side surface 614.

[0066] The first wall surface 7112 has a first portion 7113 in the +Y direction that is far from the support surface 7111 and a second portion 7114 in the −Y direction that is close to the support surface 7111 . The first portion 7113 is a surface perpendicular to the support surface 7111 . The second portion 7114 is an inclined surface that is inclined so as to approach the second wall surface 7115 as it moves from the end of the first portion 7113 on the support surface 7111 side toward the support surface 7111. In other words, the second portion 7114 is inclined so as to approach the second side surface 612 as it moves toward the support surface 7111.

[0067] The second wall surface 7115 has a configuration similar to that of the first wall surface 7112. That is, the second wall surface 7115 has a first portion 7116 in the +Y direction that is far from the support surface 7111, and a second portion 7117 in the -Y direction that is closer to the support surface 7111. The first portion 7116 is a surface perpendicular to the support surface 7111, and the second portion 7117 is an inclined surface that slopes toward the first wall surface 7112 and the fourth side surface 614 as it moves from the end of the first portion 7113 on the support surface 7111 side toward the support surface 7111.

[0068] Such a first accommodating portion 711 can be formed by cutting the base 71. Therefore, each of the wall surfaces 7112, 7115 is formed by the surface of the metal. In this embodiment, the wall surfaces 7112, 7115 are further mirror-finished, and thus have light reflectivity. Therefore, the wall surfaces 7112, 7115 reflect the incident excitation light EL. Note that the wall surfaces 7112, 7115 may be formed of another metal film formed on the surface of the metal, or a dielectric multilayer film.

[0069] Here, the dimension along the X-axis of the light-emitting surface of light-emitting element 521 constituting light source 52 is larger than the dimension along the X-axis of light guide 61 and smaller than the dimension along the X-axis between first portion 7113 and first portion 7116. Therefore, both ends of the light-emitting surface of light-emitting element 521 along the X-axis protrude outside first side surface 611 of light guide 61. On the other hand, the dimension along the X-axis of support surface 7111 is larger than the dimension along the X-axis of light guide 61. Therefore, a portion of the excitation light EL emitted from the light-emitting element 521 travels through the gap between the second side surface 612 of the light guide 61 and the first portion 7113 of the first wall surface 7112, and is then reflected by the second portion 7114 inclined with respect to the support surface 7111 to enter the second side surface 612. The same applies to the excitation light EL that passes through the gap between the fourth side surface 614 of the light guide 61 and the second wall surface 7115. This makes it easier for the excitation light EL that passes through the gap between the second side surface 612 and the first wall surface 7112 and the excitation light EL that passes through the gap between the fourth side surface 614 and the second wall surface 7115 to enter the light guide 61.

[0070] [Configuration of the second storage section] FIG. 21 is a diagram showing a part of a cross section of the light source device 3A along the XZ plane in the second housing portion 712. As shown in FIG. 18 and 19, the second accommodating section 712 is provided in the +Z direction relative to the first accommodating section 711. As shown in Fig. 21, the second accommodating section 712 has inner surfaces 7121, 7122, 7123, and 7124, is a recess that opens in the +Y and +Z directions, and is formed in a rectangular shape when viewed from the +Y direction. The inner surfaces 7121, 7122, 7123, and 7124 correspond to second inner surfaces. The inner surface 7121 faces the +Y direction and forms the bottom of the second accommodating portion 712. The inner surface 7122 faces the +X direction, and the inner surface 7123 faces the −X direction. The inner surfaces 7122 and 7123 face each other. The inner surface 7124 faces the +Z direction.

[0071] The second accommodating portion 712 communicates with the first accommodating portion 711 that accommodates the light guide 61, and accommodates a part of the accommodated portion 6AP of the light output member 6A. That is, when the first cover member 74 is fixed to the base 71, the second accommodating portion 712, together with the first cover member 74, forms an accommodation space SP that accommodates the accommodated portion 6AP of the light output member 6A. The accommodated portion 6AP is a portion of the light output member 6A that is accommodated in the accommodation space SP. The accommodated portion 6AP is a portion that is configured by the end portion of the light guide 61 in the +Z direction, the angle converter 63, the adhesive 64, and the holder 65, and the second accommodation portion 712 accommodates the portion of the accommodated portion 6AP in the -Y direction.

[0072] [Configuration of the first recess and the second recess] 18 and 19, each of the first recess 713 and the second recess 714 is a recess that extends along the X-axis across the first accommodation portion 711 that extends along the Z-axis, and is recessed in the -Y direction from the first surface 71A. The first recess 713 and the second recess 714 are spaced apart from each other along the Z-axis, and the second recess 714 is provided in the -Z direction relative to the first recess 713. A first fixing member 72A of the fixing member 72 is disposed in the first recess 713, and a second fixing member 72B of the fixing member 72 is fixed in the second recess 714 with a screw.

[0073] [Configuration of placement section and third recessed section] The arrangement portion 715 is provided at the end of the first surface 71A in the -Z direction, and is a recess that is recessed from the first surface 71A in the -Y direction. The biasing member 73 is arranged in the arrangement portion 715. The arrangement portion 715 is covered in the +Y direction by the second cover member 75. The third recess 716 is a recess recessed in the +X direction from the fifth surface 71E of the base 71, and is open in each of the -X, +Y, and -Y directions. When the light source unit 5 is fixed to the base 71, the connector 53 of the substrate 51 is disposed in the third recess 716.

[0074] [Configuration of fixed parts] Each of the two fixing members 72 is fixed to the base 71 in a state in which it presses the light guide 61 toward the base 71 from the +Y direction. The two fixing members 72 include a first fixing member 72A disposed in the first recess 713 and a second fixing member 72B disposed in the second recess 714. The second fixing member 72B is spaced apart from the first fixing member 72A in the -Z direction. Each of the fixing members 72A and 72B has two fixing portions 721 and a pressing portion 722, and in this embodiment is made of a leaf spring. The two fixing portions 721 are provided on both ends in the longitudinal direction of the fixing member 72 along the X axis. Each fixing portion 721 is fixed to the bottom surface of the first recess 713 or the bottom surface of the second recess 714 by a screw. The pressing portion 722 is provided at a position sandwiched between the two fixing portions 721. The pressing portion 722 comes into contact with the first side surface 611 of the light guide 61 and presses the light guide 61 toward the support surface 7111 of the first housing portion 711. This fixes the light guide 61 to the first housing portion 711.

[0075] [Configuration of the biasing member and the second cover member] The biasing member 73 is disposed in the disposing portion 715 and biases the reflecting element 62 toward the second end surface 616 of the light guide 61. The biasing member 73 can be formed of, for example, a leaf spring. 16 and 17, the second cover member 75 is fixed to the base 71 and covers the biasing member 73 arranged in the arrangement portion 715 in the +Y direction. The second cover member 75 is arranged in the -Z direction with respect to the substrate 51 of the light source unit 5, and is fixed to the end of the base 71 in the -Z direction.

[0076] [Configuration of first cover member] 16 and 17, the first cover member 74 is disposed in the +Z direction with respect to the substrate 51 of the light source unit 5, and is fixed to the base 71 so as to cover the second accommodation portion 712 in the +Y direction. When combined with the base 71, the first cover member 74 surrounds the accommodation portion 6AP of the light output member 6A disposed on the base 71, and forms an accommodation space SP that accommodates the accommodation portion 6AP. The first cover member 74 is made of metal or the like and has heat dissipation properties.

[0077] The first cover member 74 has a first surface 74A, a second surface 74B, a third surface 74C, a fourth surface 74D, a fifth surface 74E, and a sixth surface 74F. The first surface 74A faces in the +Y direction. The second surface 74B faces the -Y direction and is the surface opposite to the first surface 74A. When the first cover member 74 is placed on the base 71, the second surface 74B faces the first surface 71A of the base 71. The third surface 74C is a surface facing the +Z direction. When the first cover member 74 is fixed to the base 71, the third surface 74C substantially coincides with an extension of the third surface 71C of the base 71. The fourth surface 74D faces in the −Z direction and is the surface opposite to the third surface 74C. The fourth surface 74D faces the surface of the substrate 51 of the light source unit 5 facing in the +Z direction. The fifth surface 74E faces in the -X direction. The sixth surface 74F faces in the +X direction and is the surface opposite to the fifth surface 74E. When the first cover member 74 is fixed to the base 71, the fifth surface 74E substantially coincides with an extended surface of the fifth surface 71E of the base 71, and the sixth surface 74F substantially coincides with an extended surface of the sixth surface 71F of the base 71.

[0078] Fig. 22 is a diagram showing a portion of a cross section of the light source device 3A taken along the YZ plane, and more specifically, Fig. 22 is a diagram showing a portion of a cross section of the light source device 3A including the optical axis Ax of the angle converter 63. Fig. 23 is a diagram showing a portion of a cross section of the light source device 3A taken along the XZ plane at the first cover member 74. The first cover member 74 further has an accommodating recess 741. The accommodating recess 741 is a recess recessed from the second surface 74B in the +Y direction, and is open in the -Y, +Z, and -Z directions. That is, the accommodating recess 741 penetrates the first cover member 74 along the Z axis. The accommodating recess 741 has an inner surface 742 shown in FIG. 22 and inner surfaces 743 and 744 shown in FIG. 23. The inner surfaces 742 to 744 correspond to first inner surfaces.

[0079] The inner surface 742 faces in the -Y direction. The inner surface 743 faces the +X direction and is substantially aligned with an extension of the inner surface 7122 of the second accommodating portion 712. The inner surface 744 faces the −X direction and is substantially aligned with an extension of the inner surface 7123 of the second accommodating portion 712. The inner surface 743 and the inner surface 744 face each other and intersect with the inner surface 742 . The dimension between inner surface 742 and inner surface 743, i.e., the dimension of accommodating recess 741 on the X axis, is approximately the same as the dimension of second accommodating portion 712 on the X axis, and the dimension of accommodating recess 741 on the Z axis is approximately the same as the dimension of second accommodating portion 712 on the Z axis. When the first cover member 74 is placed on the base 71, the accommodating recess 741 of the first cover member 74 and the second accommodating portion 712 of the base 71 form the accommodating space SP. That is, the accommodating recess 741 accommodates the +Y direction portion of the accommodated portion 6AP.

[0080] [Arrangement of contained parts in the containment space] The portion of the light guide 61 fixed to the first housing portion 711 by the fixing member 72 is the fixed end. Specifically, the portion of the light guide 61 in the −Z direction from the contact portion with the first fixing member 72A is the fixed end fixed to the first housing portion 711. On the other hand, the portion of the light guide 61 in the +Z direction from the contact portion with the first fixing member 72A is a free end. More specifically, the portion of the light guide 61 in the +Z direction from the contact portion with the first fixing member 72A and the portion of the light guide 61 on the angle converter 63 side including the first end face 615 to which the angle converter 63 is joined is a free end. In other words, in the light output member 6A, the portion in the -Z direction from the contact point with the first fixing member 72A is the fixed end, and the portion in the +Z direction from the contact point with the first fixing member 72A is the free end, and the free end of the light output member 6A includes the accommodated portion 6AP.

[0081] As shown in FIGS. 21 to 23, the accommodated portion 6AP is not in contact with the inner surfaces 7121 to 7124 of the second accommodating portion 712 and the inner surfaces 742 to 744 of the first cover member 74, which form the accommodation space SP. Here, when excitation light EL is incident from the light source unit 5, the light guide 61, which is a wavelength converter, generates heat and expands, and in this case, the accommodated portion 6AP expands in the +Z direction. In contrast, as shown in FIGS. 21 to 23, the accommodated portion 6AP is not in contact with the second accommodating portion 712 and the first cover member 74 in the Z axis direction. 22 , when the light guide 61 is not expanded, the accommodated portion 6AP is spaced apart from the inner surface 7124 of the second accommodation unit 712, which is located in the −X direction relative to the accommodated portion 6AP, and a gap GP1 is provided between the accommodated portion 6AP and the inner surface 7124. When the light guide 61 is not expanded, the accommodated portion 6AP is spaced apart from the substrate 51 of the light source unit 5, which is located in the −X direction relative to the accommodated portion 6AP, and a gap GP2 is provided between the accommodated portion 6AP and the substrate 51. Therefore, even when the light guide 61 is not expanded, the accommodated portion 6AP is not in contact with the inner surface 7124 and the substrate 51. Therefore, even when the light guide 61 expands or contracts along the Z axis, the accommodated portion 6AP is prevented from coming into contact with the inner surfaces 7121-7124 of the second accommodating portion 712 and the inner surfaces 742-744 of the first cover member 74, which form the accommodating space SP.

[0082] On the other hand, when an impact is applied to the light source device 3A in a direction intersecting the Z axis, the housed portion 6AP swings in the direction of the impact and in the direction opposite to the direction of the impact. 22 , a gap GP3 is provided between the accommodated portion 6AP and the inner surface 7121 of the second accommodating portion 712 in the Y axis, and a gap GP4 is provided between the accommodated portion 6AP and the inner surface 742 of the accommodating recess 741. That is, the accommodated portion 6AP is not in contact with the inner surface 7121 of the second accommodating portion 712 and the inner surface 742 of the accommodating recess 741 in the Y axis. Therefore, when an impact is applied to the light source device 3A along the Y axis, the accommodated portion 6AP is prevented from coming into contact with at least one of the inner surface 7121 of the second accommodating portion 712 and the inner surface 742 of the accommodating recess 741.

[0083] 21, a gap GP5 is provided between the accommodated portion 6AP and the inner surface 7122 of the second accommodating portion 712 on the X axis, and a gap GP6 is provided between the accommodated portion 6AP and the inner surface 7123 of the second accommodating portion 712. Therefore, the accommodated portion 6AP is not in contact with the inner surfaces 7122, 7123 of the second accommodating portion 712 on the X axis. 23, a gap GP7 is provided between the accommodated portion 6AP and the inner surface 743 of the accommodating recess 741 along the X axis, and a gap GP8 is provided between the accommodated portion 6AP and the inner surface 744 of the accommodating recess 741. Therefore, the accommodated portion 6AP is not in contact with the inner surfaces 743, 744 of the accommodating recess 741 along the X axis. Therefore, when an impact acts on the light source device 3A along the X-axis, the accommodated portion 6AP is prevented from coming into contact with at least one of the inner surface 7122 of the second accommodating portion 712 and the inner surface 743 of the accommodating recess 741, and the inner surface 7123 of the second accommodating portion 712 and the inner surface 744 of the accommodating recess 741.

[0084] In other words, the housing 7 has an opening AP that opens in the +Z direction and in which the accommodated portion 6AP is disposed. The opening AP is an opening through which the emission end surface 632 of the angle converter 63 is exposed, and therefore can be said to be an emission port for the fluorescence YL emitted by the fluorescence emission device 4A. The opening AP has an inner surface AP1 facing the +Y direction, an inner surface AP2 facing the -Y direction, an inner surface AP3 facing the +X direction, an inner surface AP4 facing the -X direction, and a bottom surface AP5 facing the +Z direction. The inner surfaces AP1 to AP4 and the bottom surface AP5 are formed by the inner surfaces of the second accommodating portion 712 and the accommodating recess 741, respectively. Specifically, the inner surface AP1 is formed by the inner surface 7121, and the inner surface AP2 is formed by the inner surface 742. The inner surface AP3 is formed by the inner surfaces 7122 and 743, and the inner surface AP4 is formed by the inner surfaces 7123 and 744. The bottom surface AP5 is formed by the inner surface 7124 and a surface of the substrate 51 facing the +Z direction.

[0085] A gap GP3 is provided between the accommodated portion 6AP and the inner surface AP1, and a gap GP4 is provided between the accommodated portion 6AP and the inner surface AP2. Gaps GP5 and GP7 are provided between the accommodated portion 6AP and the inner surface AP3, and gaps GP6 and GP8 are provided between the accommodated portion 6AP and the inner surface AP4. Gaps GP1 and GP2 are provided between the accommodated portion 6AP and the bottom surface AP5. Therefore, the accommodated portion 6AP is out of contact with the inner surfaces AP1 and AP2 along the Y axis, is out of contact with the inner surfaces AP3 and AP4 along the X axis, and is out of contact with the bottom surface AP5 along the Z axis. Therefore, when the light guide 61 expands or contracts, and when an impact is applied to the light source device 3A along the X-axis or Y-axis, the accommodated portion 6AP is prevented from coming into contact with the inner surfaces AP1 to AP4 and the bottom surface AP5.

[0086] [Effects of the first embodiment] The projector 1 according to the present embodiment described above has the following advantages. The projector 1 includes a light source device 3A, a light modulation device 27, and a projection optical device 29. The light modulation device 27 corresponds to an image forming device, and forms image light by modulating the light emitted from the light source device 3A. The projection optical device 29 projects the formed image light.

[0087] The light source device 3A includes a light source 52, a light guide 61, an angle converter 63, and a holder 65. Light guide 61 has side surfaces 611 to 614 extending in the +Z direction, and a first end surface 615 and a second end surface 616 located on opposite sides and intersecting with side surfaces 611 to 614. The +Z direction corresponds to the first direction. The light source 52 emits light that enters the light guide 61 . The angle converter 63 is bonded to the first end surface 615 and converts the angle of the light emitted from the first end surface 615 . The holder 65 has a first holding portion 661 that holds the side surfaces 611 and 612, a second holding portion 671 that holds the side surfaces 613 and 614, and a first fixing portion 662 and a second fixing portion 672 that are fixed to the angle converting body 63. The holder 65 is disposed across the joint between the light guide 61 and the angle converting body 63. The first holding portion 661 and the second holding portion 671 correspond to holding portions, and the first fixing portion 662 and the second fixing portion 672 correspond to fixing portions.

[0088] According to this configuration, the holding portions 661, 671 hold the side surfaces 611 to 614 of the light guide 61, and the holder 65, to which the fixing portions 662, 672 are fixed to the angle converter 63, is disposed across the joint between the light guide 61 and the angle converter 63. This makes it possible to protect the joint between the light guide 61 and the angle converter 63. This makes it possible to prevent the angle converter 63 from peeling off from the light guide 61 even if an external force is applied to the angle converter 63. This makes it possible to configure a light source device 3A that can stably emit light, and ultimately to configure a projector 1 that can stably emit image light.

[0089] In the light source device 3A, the light guide 61 has a first corner C1 and a second corner C2 diagonally opposite the first corner C1. The side surfaces 611 to 614 include a first side surface 611 and a second side surface 612 that form the first corner C1, and a third side surface 613 and a fourth side surface 614 that form the second corner C2. The holders 661 and 671 have a first holder 661 that contacts the first side surface 611 and the second side surface 612, respectively, and a second holder 671 that contacts the third side surface 613 and the fourth side surface 614, respectively. With this configuration, the holder 65 clamps the light guide 61 at the first corner C1 and the second corner C2 that form diagonal angles on the light guide 61 using the first holding portion 661 and the second holding portion 671, thereby preventing the angle converter 63 from peeling off from the light guide 61 regardless of the direction of the external force acting on the angle converter 63.

[0090] In the light source device 3A, at least one of the first holding portion 661 and the second holding portion 671 makes line contact with the light guide 61 along the +Z direction. In this embodiment, the contact between each of the holding portions 661, 671 and the light guide 61 is line contact with the light guide 61 along the +Z direction. Here, in areas where the side of the light guide 61 is in contact with other components, the critical angle at which light traveling within the light guide 61 is internally reflected is likely to be smaller than in areas where the side is in contact with air, and light is more likely to leak outside the light guide 61. In contrast, the above configuration can reduce the contact area of each of the first holding portion 661 and the second holding portion 671 with the light guide 61. This can suppress light leakage from the contact portions between the light guide 61 and the first holding portion 661 and the second holding portion 671.

[0091] In light source device 3A, holder 65 has a first holding member 66 having a first holding portion 661 and a first connecting surface 664, a second holding member 67 having a second holding portion 671 and a second connecting surface 674, and connecting portions 651 and 652. The second connecting surface 674 faces the first connecting surface 664. The connecting portions 651 and 652 connect first holding member 66 and second holding member 67 with the first connecting surface 664 and the second connecting surface 674 facing each other. According to this configuration, the holder 65 sandwiches the light guide 61 between the first holding member 66 and the second holding member 67 in a direction in which the first corner C1 and the second corner C2, which form diagonal angles in the light guide 61, face each other. This makes it possible to prevent the angle converter 63 from peeling off from the light guide 61 using the holder 65, which has a relatively simple configuration.

[0092] In the light source device 3A, the connecting portions 651, 652 are formed by adhesive 68 provided between the first connecting surface 664 and the second connecting surface 674 with the first holding portion 661 and the second holding portion 671 each in contact with the light guide 61. This configuration makes it easy to join the first connecting surface 664 and the second connecting surface 674. In addition, because the adhesive 68 can absorb tolerances, high precision is not required for the dimensional precision of the first holding member 66 and the second holding member 67, and for the surface precision of the side surface of the light guide 61. Therefore, the holder 65 and the light guide 61 can be easily processed.

[0093] In light source device 3A, holder 65 has adhesive escape portions 653, 654. Adhesive escape portion 653 is provided between coupling portion 651 and light guide 61 in the gap between first coupling surface 664 and second coupling surface 674. Adhesive escape portion 654 is provided between coupling portion 652 and light guide 61 in the gap between first coupling surface 664 and second coupling surface 674. The distance between the first connecting surface 664 and the second connecting surface 674 in the adhesive escape portions 653 and 654 is greater than the distance between the first connecting surface 664 and the second connecting surface 674 in the connecting portions 651 and 652. With this configuration, of the adhesive 68 interposed between the first connecting surface 664 and the second connecting surface 674, excess adhesive 68 can be retained in the adhesive escape portions 653, 654. This allows the adhesive 68 to adhere to the light guide 61 and the angle converter 63, and prevents light from leaking from the light guide 61 and the angle converter 63 via the adhered adhesive 68.

[0094] In the light source device 3A, the holder 65 has heat dissipation properties, and the adhesive 68 is a light-transmitting adhesive. Here, light leaking from at least one of the light guide 61 and the angle converter 63 may enter the adhesive 68 . According to the above configuration, the adhesive 68 is translucent, and therefore can transmit light incident on the adhesive 68. This makes it possible to prevent the temperature of the adhesive 68 from rising and causing deterioration of the adhesive 68. Furthermore, the holder 65 has heat dissipation properties, and therefore can dissipate heat generated in the adhesive 68 and transferred to the holder 65, as well as heat generated by light incident on the holder 65, to the outside of the holder 65.

[0095] In the light source device 3A, the area of the cross section of the light guide 61 perpendicular to the +Z direction is 0.25 mm 2 Over 4.00mm 2 The following is the result. Here, since the angle converter 63 is bonded to the first end surface 615, the angle converter 63 is likely to peel off from the light guide 61 if the cross-sectional area of the light guide 61 is small. In contrast, by arranging the holder 65 as described above, it is possible to effectively prevent the angle converter 63 from peeling off from the thin light guide 61.

[0096] In the light source device 3A, the light source 52 outputs excitation light EL. The light guide 61 is a wavelength converter that emits fluorescence YL, which is converted light obtained by converting the wavelength of the incident excitation light EL. With this configuration, the light guide 61 can convert the wavelength of the excitation light EL emitted from the light source 52 and emit the fluorescence YL. Here, because the light guide 61 extends in the +Z direction, the optical path along which the incident excitation light EL travels within the light guide 61 can be lengthened. Therefore, the efficiency with which the light guide 61 converts the excitation light EL into fluorescence YL can be increased.

[0097] In the light source device 3A, the first side surface 611 includes an incident area onto which the excitation light EL is incident. With this configuration, since the first side surface 611 extends in the +Z direction, the amount of excitation light EL incident on the light guide 61 can be easily increased, and ultimately the amount of emitted light of fluorescence YL can be easily increased.

[0098] The light output member 6A corresponds to a wavelength conversion member and includes a light guide 61 which is a wavelength conversion body, an angle conversion body 63, and a holder 65. The light guide 61 has side surfaces 611 to 614 extending in the +Z direction, and a first end surface 615 and a second end surface 616 located opposite each other and intersecting the side surfaces 611 to 614. The light guide 61 emits fluorescence YL, which is converted light obtained by converting the wavelength of the incident excitation light EL. The angle converter 63 is bonded to the first end face 615 and converts the angle of the fluorescence YL emitted from the first end face 615. The holder 65 has holding portions 661 and 671 that hold the side surfaces 611 to 614, and fixing portions 662 and 672 that are fixed to the angle converter 63. The holder 65 is disposed across the joint between the light guide 61 and the angle converter 63. According to this configuration, similarly to the light source device 3A described above, even if an external force is applied to the angle converter 63, it is possible to prevent the angle converter 63 from peeling off from the light guide 61. Therefore, it is possible to configure a wavelength conversion member that can stably emit fluorescence YL.

[0099] The light output member 6A corresponds to a light transmission member. The light output member 6A includes a light guide 61, an angle converter 63, and a holder 65. The light guide 61 has side surfaces 611 to 614 extending in the +Z direction, and a first end surface 615 and a second end surface 616 positioned opposite each other and intersecting the side surfaces 611 to 614. Light is incident on the first side surface 611. The angle converter 63 is bonded to the first end surface 615. The angle converter 63 converts the angle of the light emitted from the first end surface 615. The holder 65 has holding portions 661 and 671 that hold the side surfaces 611 to 614, and fixing portions 662 and 672 that are fixed to the angle converter 63. The holder 65 is disposed across the joint between the light guide 61 and the angle converter 63. According to this configuration, similarly to the light source device 3A described above, even if an external force is applied to the angle converter 63, it is possible to prevent the angle converter 63 from peeling off from the light guide 61. Therefore, it is possible to configure a light transmission member that can stably emit light.

[0100] [Second embodiment] Next, a second embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector 1 according to the first embodiment, but differs in that the holder that constitutes the light output member of the light source device has fins. Note that in the following explanation, parts that are the same or approximately the same as parts that have already been explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0101] [Outline of projector and light source device] FIG. 24 is a perspective view showing a part of a light output member 6B that configures a light source device 3A provided in a projector according to this embodiment. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a light output member 6B, part of which is shown in Fig. 24, instead of the light output member 6A. That is, the light source device 3A according to this embodiment has a light output member 6B instead of the light output member 6A.

[0102] [Configuration of light emitting component] The light output member 6B has a holder 65B instead of the holder 65, but has the same configuration and function as the light output member 6A according to the first embodiment. Like the holder 65, the holder 65B includes a first holding member 66B and a second holding member 67B, and is configured by joining the holding members 66B and 67B together with an adhesive 68.

[0103] The first holding member 66B has the same configuration and function as the first holding member 66, except that it further has a plurality of fins 666. The multiple fins 666 protrude in the -X direction from an outer surface 66B1 of the first holding member 66B facing the -X direction, and are aligned along the Z axis. The multiple fins 666 may be aligned along the Y axis. The multiple fins 666 may also protrude in the +Y direction from an outer surface 66B2 of the first holding member 66B facing the +Y direction, or may be provided on both the outer surface 66B1 and the outer surface 66B2.

[0104] The second holding member 67B has the same configuration and function as the second holding member 67, except that it further has a plurality of fins 676. The multiple fins 676 protrude in the +X direction from an outer surface 67B1 of the second holding member 67B facing the +X direction, and are aligned along the Z axis. The multiple fins 676 may be aligned along the Y axis. The multiple fins 676 may also protrude in the -Y direction from an outer surface 67B2 of the second holding member 67B facing the -Y direction, or may be provided on both the outer surface 67B1 and the outer surface 67B2.

[0105] [Effects of the second embodiment] The projector according to this embodiment described above has the same effects as the projector 1 according to the first embodiment, and also has the following effects. In the light source device 3A according to this embodiment, the holder 65B has a plurality of fins 666 and 676. With this configuration, heat transferred from the light guide 61 and the angle converter 63 can be easily dissipated to the outside of the holder 65B, thereby suppressing temperature increases in the light guide 61 and the angle converter 63.

[0106] [Third embodiment] Next, a third embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector 1 according to the first embodiment, but differs in the configuration for connecting the first holding member and the second holding member of the holder. In the following explanation, parts that are the same or substantially the same as parts that have already been explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0107] [Outline of projector and light source device] FIG. 25 is an exploded perspective view showing a part of a light output member 6C that configures a light source device 3A provided in a projector according to this embodiment. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a light output member 6C, part of which is shown in Fig. 25, instead of the light output member 6A. That is, the light source device 3A according to this embodiment has a light output member 6C instead of the light output member 6A.

[0108] [Configuration of light output member] The light output member 6C has the same configuration and function as the light output member 6A according to the first embodiment, except that it has a holder 65C and a fixture 69C instead of the holder 65. Similar to holder 65, holder 65C includes first holding member 66C and second holding member 67C, and is configured by connecting holding members 66C, 67C with fastener 69C. Moreover, holder 65C has first connecting portion 65C1 and second connecting portion 65C2 instead of first connecting portion 651 and second connecting portion 652 configured with adhesive 68.

[0109] The first holding member 66C has an insertion hole 66C3 that opens in an outer surface 66C1 facing the -X direction and a locking portion 66C4 that is provided on an outer surface 66C2 facing the +Y direction, and other than that, has the same configuration and function as the first holding member 66. The first holding member 66C may have a plurality of fins 666. The insertion hole 66C3 opens to the outer surface 66C1 and the second connecting region 6642. A fixing member 69C is inserted through the insertion hole 66C3. The insertion hole 66C3 constitutes the first connecting portion 65C1. The locking portion 66C4 opens to the outer surface 66C2 and the first connecting region 6641. The locking portion 66C4 locks a fixing device 69C inserted through an insertion hole 67C3 (described later). In this embodiment, the locking portion 66C4 is a screw hole and constitutes the second connecting portion 65C2.

[0110] The second holding member 67C has an insertion hole 67C3 that opens to an outer surface 67C1 facing the +X direction and a locking portion 67C4 that is provided on an outer surface 67C2 facing the +Y direction, and other than that, has the same configuration and function as the second holding member 67. The second holding member 67C may have a plurality of fins 676. The insertion hole 67C3 opens to the outer surface 67C1 and the third connecting region 6741. A fixing device 69C is inserted into the insertion hole 67C3. The insertion hole 67C3 constitutes the second connecting portion 65C2. When the first holding member 66C and the second holding member 67C are combined, the central axis of the insertion hole 67C3 and the central axis of the locking portion 66C4 approximately coincide with each other. The locking portion 67C4 opens to the outer surface 66C2 and the fourth connecting region 6742. The locking portion 67C4 locks the fastener 69C inserted through the insertion hole 66C3. In this embodiment, the locking portion 67C4 is a screw hole and constitutes the first connecting portion 65C1. When the first holding member 66C and the second holding member 67C are combined, the central axis of the locking portion 67C4 and the central axis of the insertion hole 66C3 approximately coincide with each other. The fixing device 69C is composed of two screws 69C1 and 69C2.

[0111] FIG. 26 is a perspective view showing a holder 65C in which a first holding member 66C and a second holding member 67C are combined. 26 , when connecting the first holding member 66C and the second holding member 67C, with the first connecting region 6641 and the third connecting region 6741 in contact and the second connecting region 6642 and the fourth connecting region 6742 in contact, a screw 69C1 is inserted into the insertion hole 66C3 of the first holding member 66C from the outer surface 66C1 side so as to be positioned in the −Y direction as it moves in the +X direction, and then the tip of the screw 69C1 is locked into the locking portion 67C4 of the second holding member 67C. Similarly, a screw 69C2 is inserted into the insertion hole 67C3 of the second holding member 67C from the outer surface 67C1 side so as to be positioned in the +Y direction as it moves in the −X direction, and then the tip of the screw 69C2 is locked into the locking portion 66C4 of the first holding member 66C. As a result, the first holding member 66C and the second holding member 67C are connected to each other, and the holder 65C holds the light guide 61.

[0112] [Effects of the third embodiment] The projector according to this embodiment described above has the same effects as the projector 1 according to the first embodiment, and also has the following effects. The light source device 3A according to this embodiment includes a fixture 69C that fixes a first holding member 66C and a second holding member 67C. The holder 65C includes a first connecting portion 65C1 and a second connecting portion 65C2. The first connecting portion 65C1 and the second connecting portion 65C2 correspond to the connecting portions.

[0113] The first connecting portion 65C1 has an insertion hole 66C3 and a locking portion 67C4. The insertion hole 66C3 is provided in the first holding member 66C out of the first holding member 66C and the second holding member 67C. A screw 69C1 of the fixing tool 69C is inserted into the insertion hole 66C3. The locking portion 67C4 is provided on the second holding member 67C out of the first holding member 66C and the second holding member 67C. The locking portion 67C4 locks the screw 69C1 inserted through the insertion hole 66C3.

[0114] The second connecting portion 65C2 has an insertion hole 67C3 and a locking portion 66C4. The insertion hole 67C3 is provided in the second holding member 67C out of the first holding member 66C and the second holding member 67C. A screw 69C2 of the fixing tool 69C is inserted into the insertion hole 67C3. The locking portion 66C4 is provided on the first holding member 66C out of the first holding member 66C and the second holding member 67C. The locking portion 66C4 locks the screw 69C2 inserted through the insertion hole 67C3. With this configuration, the first holding member 66C and the second holding member 67C can be firmly and easily fixed together, and therefore the light guide 61 and the angle converter 63 can be firmly and easily fixed together by the holder 65C, effectively preventing the angle converter 63 from peeling off from the light guide 61.

[0115] [Fourth embodiment] Next, a fourth embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector 1 according to the first embodiment, but differs in the configuration for connecting the first holding member and the second holding member of the holder. In the following explanation, parts that are the same or substantially the same as parts that have already been explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0116] [Outline of projector and light source device] FIG. 27 is a diagram showing a light output member 6D that constitutes a light source device 3A provided in a projector according to this embodiment, viewed from the +Z direction. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a light output member 6D shown in Fig. 27 instead of the light output member 6A. That is, the light source device 3A according to this embodiment has a light output member 6D instead of the light output member 6A.

[0117] [Configuration of light emitting component] The light output member 6D has the same configuration and function as the light output member 6A according to the first embodiment, except that it has a holder 65D and a fixture 69D instead of the holder 65. Like holder 65, holder 65D includes first holding member 66 and second holding member 67. Holder 65D may or may not include first connecting portion 651 and second connecting portion 652 formed by adhesive 68 provided between first connecting surface 664 and second connecting surface 674.

[0118] The fixing device 69D is an elastic member that clamps the holder 65D and fixes the holder 65D to the light guide 61. More specifically, the fixing device 69D is a leaf spring. The fixing device 69D has a first pressing piece 69D1, a second pressing piece 69D2, and a connecting piece 69D3. The first pressing piece 69D1 comes into contact with the outer surface F11 of the first holding member 66 facing the −X direction and the outer surface F12 facing the +Y direction, and presses the first holding member 66 in a direction toward the second holding member 67. The second pressing piece 69D2 comes into contact with an outer surface F21 of the second holding member 67 facing the +X direction and an outer surface F22 facing the −Y direction, and presses the second holding member 67 in a direction toward the first holding member 66. The connection piece 69D3 connects the first pressing piece 69D1 and the second pressing piece 69D2. Such fixing device 69D presses first holding member 66 and second holding member 67 in directions in which they approach each other, so that the first holding member 66 and second holding member 67 are maintained in a connected state.

[0119] [Effects of the fourth embodiment] The projector according to this embodiment described above has the same effects as the projector 1 according to the first embodiment, and also has the following effects. The light source device 3A according to this embodiment includes a fixture 69D that fixes the holder 65D to the light guide 61 by clamping the holder 65D. Holder 65D has a first holding member 66 and a second holding member 67. First holding member 66 has a first holding portion 661, a first fixing portion 662, and a first connecting surface 664. Second holding member 67 has a second holding portion 671, a second fixing portion 672, and a second connecting surface 674.

[0120] The fixing member 69D, which is an elastic member, has a first pressing piece 69D1, a second pressing piece 69D2, and a connecting piece 69D3. The first pressing piece 69D1 presses the first holding member 66 in a direction toward the second holding member 67. The second pressing piece 69D2 presses the second holding member 67 in a direction toward the first holding member 66. The connecting piece 69D3 connects the first pressing piece 69D1 and the second pressing piece 69D2. With this configuration, the fixing device 69D can be easily attached to the holder 65D, and the first holding member 66 and the second holding member 67 can be easily clamped together. Therefore, the holder 65D can be easily attached to the light guide 61 and the angle converter 63, and peeling of the angle converter 63 from the light guide 61 can be easily prevented.

[0121] The first pressing piece 69D1 may sandwich the outer surface F12 of the first holding member 66 and the outer surface F21 of the second holding member 67 and press the first holding member 66 and the second holding member 67 in a direction in which they approach each other. The second pressing piece 69D2 may sandwich the outer surface F11 of the first holding member 66 and the outer surface F22 of the second holding member 67 and press the first holding member 66 and the second holding member 67 in a direction in which they approach each other.

[0122] [Fifth embodiment] Next, a fifth embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector 1 according to the first embodiment, but the state of contact between the holder and the light guide is different. In the following explanation, parts that are the same or approximately the same as parts that have already been explained will be assigned the same reference numerals and explanations thereof will be omitted.

[0123] [Outline of projector and light source device] FIG. 28 is an enlarged view showing a part of a cross section along the YZ plane of a light output member 6E that constitutes a light source device 3A provided in a projector according to this embodiment. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a light output member 6E, part of which is shown in Fig. 28, instead of the light output member 6A. That is, the light source device 3A according to this embodiment has a light output member 6E instead of the light output member 6A.

[0124] [Configuration of light output member] The light output member 6E has the same configuration and function as the light output member 6A according to the first embodiment, except that it includes a holder 65E instead of the holder 65. The holder 65E includes a first holding member 66E and a second holding member 67E. The first holding member 66E has the same configuration and function as any one of the first holding members 66, 66B, and 66C according to the first, second, and third embodiments. Here, the first contact portion 6611 of the first holding portion 661 of the first holding member 66E is provided with a plurality of recesses 6613. Therefore, the first contact portion 6611 comes into point contact with the first side surface 611 of the light guide 61 at a plurality of points along the +Z direction of the first contact portion 6611. Although not shown, the second contact portion 6612 of the first holding portion 661 of the first holding member 66E also has a plurality of similar recesses 6613. Therefore, the second contact portion 6612 comes into point contact with the second side surface 612 of the light guide 61 at a plurality of points along the +Z direction of the second contact portion 6612.

[0125] The second holding member 67E has the same configuration and function as any one of the second holding members 67, 67B, 67C according to the first, second, and third embodiments. Here, a third contact portion 6711 of a second holding portion 671 of the second holding member 67E is provided with a plurality of recesses 6713. Therefore, the third contact portion 6711 comes into point contact with the third side surface 613 of the light guide 61 at a plurality of points on the third contact portion 6711 along the +Z direction. Although not shown, a fourth contact portion 6712 of the second holding portion 671 of the second holding member 67E also has a plurality of similar recesses 6713. Therefore, the fourth contact portion 6712 comes into point contact with the fourth side surface 614 of the light guide 61 at a plurality of locations along the +Z direction of the fourth contact portion 6712.

[0126] [Effects of the fifth embodiment] The projector according to this embodiment described above has the same effects as the projector 1 according to the first embodiment, and also has the following effects. In the light source device 3A according to this embodiment, the contact between at least one of the first holding portion 661 and the second holding portion 671 and the light guide 61 is point contact at multiple locations along the +Z direction. In this embodiment, the contact between the first contact portion 6611 of the first holding portion 661 and the first side surface 611 of the light guide 61 and the second contact portion 6612 of the first holding portion 661 and the second side surface 612 of the light guide 61 are each point contact at multiple locations along the +Z direction. Similarly, the contact between the third contact portion 6711 of the second holding portion 671 and the third side surface 613 of the light guide 61 and the fourth contact portion 6712 of the second holding portion 671 and the fourth side surface 614 of the light guide 61 are each point contact at multiple locations along the +Z direction. Here, in areas where the side of the light guide 61 is in contact with other components, the critical angle at which light traveling within the light guide 61 is internally reflected is likely to be smaller than in areas where the side is in contact with air, and light is more likely to leak outside the light guide 61. In contrast, the above configuration can reduce the contact area of each of the first holding portion 661 and the second holding portion 671 with the light guide 61. This can suppress light leakage from the contact portions between the light guide 61 and the first holding portion 661 and the second holding portion 671.

[0127] [Modification of the embodiment] The present disclosure is not limited to the above-described embodiments, and modifications and improvements within the scope of achieving the object of the present disclosure are included in the present disclosure. In each of the above embodiments, the projector includes three light modulation devices 27. However, the present disclosure is not limited to this, and can also be applied to a projector including two or less light modulation devices, or four or more light modulation devices.

[0128] In each of the above embodiments, the light guide 61 is a wavelength converter containing a phosphor that is excited by incident excitation light. However, the present invention is not limited to this. The light guide 61 may emit incident light without converting its optical properties, such as its wavelength. Alternatively, the light guide 61 may convert optical properties of the incident light other than its wavelength.

[0129] In the above embodiments, the holders 65, 65B, 65C, 65D, and 65E include the first holding members 66, 66B, 66C, and 66E and the second holding members 67, 67B, 67C, and 67E. However, this is not limiting, and the holders may be integrated. In this case, the light guide 61 to which the angle converter 63 is joined may be inserted into the holder along the Z axis so that the holding portions 661 and 671 come into contact with the side surfaces 611 to 614 of the light guide 61.

[0130] In the above-described embodiments, the holder 65 has the adhesive escape portions 653, 654. However, this is not limiting, and the adhesive escape portions 653, 654 may be omitted. The same applies to the other holders 65, 65B, 65D, and 65E.

[0131] In each of the above embodiments, the cross-sectional area of the light guide 61 perpendicular to the +Z direction is 0.25 mm 2 Over 4.00mm 2 However, the area of the cross section of the light guide 61 perpendicular to the +Z direction is not limited to this, and is 0.25 mm 2 May be less than 4.00 mm 2 may exceed.

[0132] In each of the above embodiments, the light guide 61 has side surfaces 611 to 614 that intersect with the first end surface 615 and the second end surface 616, and the excitation light EL is incident on the first side surface 611. However, this is not limiting, and when the first end surface 615 is used as the light emission surface, the other side surface or the second end surface may include an incident region where the light is incident.

[0133] In each of the above embodiments, the base 71 and the first cover member 74 of the housing 7 are separate bodies, and the first cover member 74 is fixed to the base 71. However, this is not limiting, and the housing 7 may include the base 71 with the first cover member 74 integrated therewith.

[0134] In each of the above embodiments, the light modulation device 27 has a transmissive liquid crystal panel having different light incident and light exit surfaces. However, the present invention is not limited to this, and the light modulation device may have a reflective liquid crystal panel having the same light incident and light exit surfaces. Furthermore, as long as the light modulation device is capable of modulating an incident light beam to form an image according to image information, a light modulation device other than a liquid crystal device, such as a device using a micromirror, for example, a DMD (Digital Micromirror Device), may be used.

[0135] In the above embodiments, examples have been given in which the light source devices 3A and 3F according to the present disclosure are applied to projectors. However, the light source device according to the present disclosure may also be used in lighting fixtures, headlights of automobiles, and the like.

[0136] Summary of this disclosure A summary of this disclosure is provided below. [Appendix 1] a light guide having a side surface extending in a first direction and a first end surface and a second end surface intersecting the side surface and positioned on opposite sides of each other; a light source that emits light incident on the light guide; an angle converter bonded to the first end surface and configured to convert the angle of light emitted from the first end surface; a holder having a holding portion that holds the side surface and a fixing portion that is fixed to the angle converter, the holder being disposed across a joint portion between the light guide and the angle converter; A light source device characterized by:

[0137] With this configuration, the holding portion holds the side surface of the light guide, and the holder, whose fixing portion is fixed to the angle converter, is positioned across the joint between the light guide and the angle converter, thereby protecting the joint between the light guide and the angle converter. This prevents the angle converter from peeling off from the light guide even when an external force is applied to the angle converter. Therefore, a light source device that can stably emit light can be configured.

[0138] [Appendix 2] 2. The light source device according to claim 1, The light guide is A first corner portion; a second corner portion diagonally opposite the first corner portion, The aspect is a first side surface and a second side surface that form the first corner portion; a third side surface and a fourth side surface that constitute the second corner portion, The holding portion is a first holding portion that contacts each of the first side surface and the second side surface; and a second holding portion that contacts each of the third side surface and the fourth side surface. A light source device characterized by: With this configuration, the holder clamps the light guide at the first and second diagonal corners of the light guide using the first and second holding portions, thereby preventing the angle converter from peeling off from the light guide regardless of the direction of the external force acting on the angle converter.

[0139] [Appendix 3] 3. The light source device according to claim 2, contact between at least one of the first holding portion and the second holding portion and the light guide is line contact along the first direction or point contact at a plurality of points along the first direction; A light source device characterized by: Here, in areas where the side of the light guide is in contact with other components, the critical angle at which light traveling within the light guide is internally reflected is likely to be smaller than in areas where the light guide is in contact with air, and light is more likely to leak outside the light guide. In contrast, with the above configuration, the contact area of each of the first and second holding parts with the light guide can be reduced, thereby suppressing light leakage from the contact areas between the light guide and the first and second holding parts.

[0140] [Appendix 4] 4. The light source device according to claim 3, The holder is a first holding member having the first holding portion and a first connecting surface; a second holding member having the second holding portion and a second connecting surface opposite the first connecting surface; a connecting portion that connects the first holding member and the second holding member with the first connecting surface and the second connecting surface facing each other, A light source device characterized by: With this configuration, the holder clamps the light guide between the first holding member and the second holding member in a direction in which the first and second diagonal corners of the light guide face each other, and thus, the holder, which has a relatively simple configuration, can prevent the angle converter from peeling off from the light guide.

[0141] [Appendix 5] 5. The light source device according to claim 4, the connecting portion is formed by an adhesive provided between the first connecting surface and the second connecting surface in a state where the first holding portion and the second holding portion are in contact with the light guide, A light source device characterized by: This configuration allows for easy joining of the first and second connecting surfaces. Furthermore, because the adhesive can absorb tolerances, high dimensional accuracy of the first and second holding members and surface accuracy of the side surfaces of the light guide are not required. Therefore, the holder and the light guide can be easily processed.

[0142] [Appendix 6] 6. The light source device according to claim 5, the holder has an adhesive escape portion provided between the connecting portion and the light guide in a gap between the first connecting surface and the second connecting surface, a distance between the first connecting surface and the second connecting surface in the adhesive escape portion is greater than a distance between the first connecting surface and the second connecting surface in the connecting portion; A light source device characterized by: With this configuration, excess adhesive interposed between the first and second connecting surfaces can be retained in the adhesive relief portion, thereby preventing the adhesive from adhering to at least one of the light guide and the angle converter, and preventing light from leaking from the at least one of the light guide and the angle converter via the adhesive.

[0143] [Appendix 7] 10. The light source device according to claim 5, the holder has heat dissipation properties, The adhesive is a light-transmitting adhesive. A light source device characterized by: Here, light leaking from at least one of the light guide and the angle converter may enter the adhesive. According to the above configuration, the adhesive is translucent, allowing light incident on the adhesive to pass through. This prevents the adhesive from increasing in temperature and deteriorating. Furthermore, the holder has heat dissipation properties, allowing heat generated in the adhesive and transferred to the holder, as well as heat generated by light incident on the holder, to be dissipated to the outside of the holder.

[0144] [Appendix 8] 5. The light source device according to claim 4, a fastener for fastening the first holding member and the second holding member; The connecting portion is an insertion hole provided in one of the first holding member and the second holding member, through which the fixing device is inserted; a locking portion provided on the other of the first holding member and the second holding member, which locks the fixing device inserted through the insertion hole, A light source device characterized by: With this configuration, the first holding member and the second holding member can be firmly and easily fixed together, and therefore the light guide and the angle converter can be firmly and easily fixed by the holder, effectively preventing the angle converter from peeling off from the light guide.

[0145] [Appendix 9] 8. The light source device according to claim 3, an elastic member that clamps the holder and fixes the holder to the light guide; The holder is a first holding member having the first holding portion and a first connecting surface; a second holding member having the second holding portion and a second connecting surface facing the first connecting surface, The elastic member is a first pressing piece that presses the first holding member in a direction toward the second holding member; a second pressing piece that presses the second holding member in a direction toward the first holding member; A connecting piece that connects the first pressing piece and the second pressing piece, A light source device characterized by: With this configuration, the elastic member can be easily attached to the holder, and the first holding member and the second holding member can be easily clamped together. Therefore, the holder can be easily attached to the light guide and the angle converter, and separation of the angle converter from the light guide can be easily prevented.

[0146] [Appendix 10] 10. The light source device according to claim 1, The holder has fins. A light source device characterized by: With this configuration, heat transferred from the light guide and the angle converter can be easily dissipated to the outside of the holder, thereby suppressing temperature increases in the light guide and the angle converter.

[0147] [Appendix 11] 11. The light source device according to claim 1, The cross-sectional area of the light guide perpendicular to the first direction is 0.25 mm 2 Over 4.00mm 2 Below is the A light source device characterized by: Here, since the angle converter is bonded to the end face of the light guide, if the cross-sectional area of the light guide is small, the angle converter is likely to peel off from the light guide. In contrast, by arranging the holder as described above, it is possible to effectively prevent the angle converter from peeling off from the thin light guide.

[0148] [Appendix 12] 12. The light source device according to claim 1, the light source outputs excitation light; The light guide is a wavelength converter that converts the wavelength of the incident excitation light and emits converted light. A light source device characterized by: According to this configuration, the light guide can convert the wavelength of the excitation light emitted from the light source and emit the converted light. Here, since the light guide extends in the first direction, the optical path along which the incident excitation light travels within the light guide can be lengthened. Therefore, the efficiency of conversion of the excitation light into the converted light by the light guide can be improved.

[0149] [Appendix 13] 13. The light source device according to claim 12, The side surface includes an incident area onto which the excitation light is incident. A light source device characterized by: With this configuration, the side surface of the light guide extends in the first direction, so that the amount of excitation light incident on the light guide can be easily increased, and thus the amount of emitted converted light can be easily increased.

[0150] [Appendix 14] A light source device according to any one of Supplementary Note 1 to Supplementary Note 13; an image forming device that modulates the light emitted from the light source device to form image light; a projection optical device that projects the image light, A projector characterized by: According to such a configuration, it is possible to achieve the same effects as the light source device described above, and also to configure a projector that can stably emit image light.

[0151] [Appendix 15] a wavelength converter having a side surface extending in a first direction and a first end surface and a second end surface intersecting the side surface and positioned opposite to each other, the wavelength converter converting the wavelength of incident excitation light and emitting converted light; an angle converter bonded to the first end surface and configured to convert the angle of light emitted from the first end surface; a holder having a holding portion that holds the side surface and a fixing portion that is fixed to the angle converter, the holder being arranged across a joint portion between the wavelength converter and the angle converter; A wavelength conversion member characterized by: According to this configuration, similar to the light source device described above, even if an external force is applied to the angle converter, it is possible to prevent the angle converter from peeling off from the light guide, thereby forming a wavelength conversion member that can stably emit converted light.

[0152] [Appendix 16] a light guide having a side surface extending in a first direction and a first end surface and a second end surface intersecting the side surface and positioned opposite to each other, the light being incident on the side surface; an angle converter bonded to the first end surface and configured to convert the angle of light emitted from the first end surface; a holder having a holding portion that holds the side surface and a fixing portion that is fixed to the angle converter, the holder being disposed across a joint portion between the light guide and the angle converter; An optical transmission component characterized by: According to this configuration, similar to the light source device and wavelength conversion member described above, even if an external force is applied to the angle converter, it is possible to prevent the angle converter from peeling off from the light guide, thereby providing an optical transmission member that can stably emit light. [Explanation of symbols]

[0153] 1...Projector, 27...Light modulation device, 27B...Blue light modulation device, 27G...Green light modulation device, 27R...Red light modulation device, 29...Projection optical device, 3A, 3F...Light source device, 4A...Fluorescent light emitting device, 5...Light source section, 51...Substrate, 52...Light source, 521...Light emitting element, 53...Connector, 6A, 6B, 6C, 6D, 6E...Light emitting member (wavelength conversion member, light transmission member), 61...Light guide (wavelength conversion body), 611...First side, 612...Second side, 6 13...third side surface, 614...fourth side surface, 615...first end surface, 616...second end surface, 62...reflecting element, 63...angle conversion body, 631...incident end surface, 632...exiting end surface, 633...first side surface, 634...second side surface, 635...third side surface, 636...fourth side surface, 637...flange, 64...adhesive, 65, 65B, 65C, 65D, 65E...holder, 651...first connecting portion, 652...second connecting portion, 653...adhesive escape portion, 654...adhesive escape portion, 66, 66B, 66C, 66E...first holding member, 661...first holding portion, 662...first fixing portion, 663...first cover portion, 664...first connecting surface, 665...first recessed portion, 666...fin, 66C3, 67C3...through hole, 66C4, 67C4...locking portion, 67, 67B, 67C, 67E...second holding member, 671...second holding portion, 672...second fixing portion, 673...second cover portion, 674...second connecting surface, 675...second recessed portion, 676...fin, 68...adhesive , 69C...fixing device, 69C1, 69C2...screw, 7...housing, 71...base, 711...first accommodating portion, 712...second accommodating portion, 7121, 7122, 7123, 7124...inner surface, 713...first recess, 714...second recess, 715...positioning portion, 72...fixing member, 73...urge member, 74...first cover member (cover member), 741...accommodating recess, 742, 743, 744...inner surface, 75...second cover member, C1...first corner portion, C2...second corner portion.

Claims

1. a light guide having a side surface extending in a first direction and a first end surface and a second end surface intersecting the side surface and positioned on opposite sides of the side surface; a light source that emits light incident on the light guide; an angle converter bonded to the first end surface and configured to convert an angle of light emitted from the first end surface; a holder having a holding portion that holds the side surface and a fixing portion that is fixed to the angle converter, the holder being disposed across a joint portion between the light guide and the angle converter; A light source device characterized by:

2. 2. The light source device according to claim 1, The light guide is A first corner portion; a second corner portion diagonally opposite the first corner portion, The aspect is a first side surface and a second side surface that form the first corner portion; a third side surface and a fourth side surface that constitute the second corner portion, The holding portion is a first holding portion that contacts each of the first side surface and the second side surface; a second holding portion that contacts each of the third side surface and the fourth side surface, A light source device characterized by:

3. 3. The light source device according to claim 2, a contact between at least one of the first holding portion and the second holding portion and the light guide body is a line contact along the first direction or a point contact at a plurality of points along the first direction; A light source device characterized by:

4. 4. The light source device according to claim 3, The holder is a first holding member having the first holding portion and a first connecting surface; a second holding member having the second holding portion and a second connecting surface opposite the first connecting surface; a connecting portion that connects the first holding member and the second holding member with the first connecting surface and the second connecting surface facing each other, A light source device characterized by:

5. 5. The light source device according to claim 4, the connecting portion is configured by an adhesive provided between the first connecting surface and the second connecting surface in a state where the first holding portion and the second holding portion are in contact with the light guide, respectively. A light source device characterized by:

6. 6. The light source device according to claim 5, the holder has an adhesive escape portion provided between the connecting portion and the light guide in a gap between the first connecting surface and the second connecting surface, a distance between the first connecting surface and the second connecting surface in the adhesive escape portion is greater than a distance between the first connecting surface and the second connecting surface in the connecting portion; A light source device characterized by:

7. 7. The light source device according to claim 5, the holder has heat dissipation properties, The adhesive is a light-transmitting adhesive. A light source device characterized by:

8. 5. The light source device according to claim 4, a fastener for fastening the first holding member and the second holding member; The connecting portion is an insertion hole provided in one of the first holding member and the second holding member, through which the fixing device is inserted; a locking portion provided on the other of the first holding member and the second holding member, the locking portion locking the fixing device inserted through the insertion hole; A light source device characterized by:

9. 4. The light source device according to claim 3, an elastic member that clamps the holder and fixes the holder to the light guide; The holder is a first holding member having the first holding portion and a first connecting surface; a second holding member having the second holding portion and a second connecting surface facing the first connecting surface, The elastic member is a first pressing piece that presses the first holding member in a direction toward the second holding member; a second pressing piece that presses the second holding member in a direction toward the first holding member; a connecting piece that connects the first pressing piece and the second pressing piece, A light source device characterized by:

10. 7. The light source device according to claim 1, The holder has fins. A light source device characterized by:

11. 7. The light source device according to claim 1, The cross-sectional area of the light guide perpendicular to the first direction is 0.25 mm ２ Over 4.00 mm ２ Below is the A light source device characterized by:

12. 7. The light source device according to claim 1, the light source outputs excitation light; The light guide is a wavelength converter that converts the wavelength of the incident excitation light and emits converted light. A light source device characterized by:

13. 13. The light source device according to claim 12, The side surface includes an incident area onto which the excitation light is incident. A light source device characterized by:

14. The light source device according to any one of claims 1 to 6, an image forming device that modulates the light emitted from the light source device to form image light; a projection optical device that projects the image light, A projector characterized by:

15. a wavelength converter having a side surface extending in a first direction and a first end surface and a second end surface intersecting the side surface and positioned opposite to each other, the wavelength converter converting the wavelength of incident excitation light and emitting converted light; an angle converter bonded to the first end surface and configured to convert an angle of light emitted from the first end surface; a holder having a holding portion that holds the side surface and a fixing portion that is fixed to the angle converter, the holder being arranged across a joint portion between the wavelength converter and the angle converter; A wavelength conversion member characterized by:

16. a light guide having a side surface extending in a first direction and a first end surface and a second end surface intersecting the side surface and positioned opposite to each other, the light being incident on the side surface; an angle converter bonded to the first end surface and configured to convert an angle of light emitted from the first end surface; a holder having a holding portion that holds the side surface and a fixing portion that is fixed to the angle converter, the holder being disposed across a joint portion between the light guide and the angle converter; An optical transmission component characterized by:

Images