Light source device and projector

Abstract

The present invention provides a light source device and a projector that can suppress the temperature of the wavelength conversion component from becoming too high. [Solution] The light source device of the present invention comprises a light source unit having a light-emitting element that emits light, a light guide member into which light emitted from the light-emitting element is incident and which emits light, and a support member that supports the light guide member. The support member has a support surface that faces a first direction intersecting the longitudinal direction in which the light guide member extends and supports the light guide member, a heat transfer member that extends in a second direction intersecting the longitudinal direction, and a holding part that holds the heat transfer member. The heat transfer member is arranged inside the holding part, and the thermal conductivity of the heat transfer member is greater than the thermal conductivity of the holding part.

Description

Technical Field

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

Background Art

[0002] As a light source device used in a projector, there has been proposed a light source device that emits fluorescence emitted from a phosphor when excitation light emitted from a light emitting element is irradiated onto a phosphor rod. Patent Document 1 below discloses a light source device configured to fix a phosphor rod to a metal holder by an elastic member such as a spring. In the light source device having such a configuration, heat generated when the phosphor rod emits fluorescence is transmitted to the holder, and heat is dissipated from the outer surface of the holder.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique described in Patent Document 1, since the phosphor rod is rod-shaped, it is difficult for the phosphor rod to transmit heat generated in the phosphor rod to the holder in a direction intersecting the longitudinal direction of the phosphor rod. Therefore, there is a risk that the temperature of the phosphor rod becomes too high. If the temperature of the phosphor rod becomes too high, there is a risk that temperature quenching of fluorescence increases in the phosphor rod. Therefore, there is a risk that the wavelength conversion efficiency, which is the efficiency of converting excitation light into fluorescence by the phosphor rod, decreases.

Means for Solving the Problems

[0005] To solve the above problems, a light source device according to one aspect of the present invention comprises a light source unit having a light-emitting element that emits light, a light guide member into which the light emitted from the light-emitting element is incident and which emits light, and a support member that supports the light guide member, wherein the support member has a support surface that faces a first direction intersecting the longitudinal direction in which the light guide member extends and supports the light guide member, a heat transfer member that extends in a second direction intersecting the longitudinal direction, and a holding portion that holds the heat transfer member, wherein the heat transfer member is disposed inside the holding portion, and the thermal conductivity of the heat transfer member is greater than the thermal conductivity of the holding portion.

[0006] A projector according to one aspect of the present invention comprises a light source device according to one aspect of the present invention, an optical modulator for modulating light emitted from the light source device, and a projection optical device for projecting the light modulated by the optical modulator. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of a projector according to one embodiment. [Figure 2] This is a schematic diagram of the first lighting device. [Figure 3] This is a plan view of the light source device as seen from the first direction. [Figure 4] This is a cross-sectional view of the light source device along line IV-IV in Figure 3. [Figure 5] This is a cross-sectional view of the light source device along the VV line in Figure 3. [Figure 6] This is a cross-sectional view of the light source device along the line VI-VI in Figure 3. [Figure 7] This is a plan view of the light source device of the second embodiment as seen from the first direction. [Figure 8] This is a cross-sectional view of the light source device along line VIII-VIII in Figure 7. [Figure 9] This is a plan view of the light source device of the third embodiment as seen from the first direction. [Figure 10] This is a cross-sectional view of the light source device along line XX in Figure 9. [Figure 11]This is a plan view of the light source device of the fourth embodiment, as seen from the first direction. [Figure 12] This is a cross-sectional view of the light source device along the line XII-XII in Figure 11. [Figure 13] This is a cross-sectional view showing a light source device according to the fifth embodiment. [Figure 14] This is a cross-sectional view showing a light source device according to the sixth embodiment. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described below. The projector of this embodiment is an example of a projector that uses a liquid crystal panel as an optical modulation device. In the following drawings, the dimensions of each component may be shown on a different scale to make them easier to see.

[0009] In the following explanation, the XYZ Cartesian coordinate system will be used in the drawings as needed. The X-axis is the axis that extends in the direction in which the light guide member of the embodiment described below extends. In the following explanation, the direction in which the X-axis extends (X-axis direction) may be referred to as the "longitudinal direction". The Z-axis is an axis perpendicular to the X-axis. The Z-axis is an axis that runs along the vertical direction of the projector. In the following explanation, the direction in which the Z-axis extends will be referred to as the Z-axis direction. The Y-axis is an axis that is perpendicular to both the X-axis and the Z-axis. In the following explanation, the direction in which the Y-axis extends (Y-axis direction) may be referred to as the "incident direction". The incident direction is the direction in which the first light enters the light guide member. In the following explanation, the side in which the X-axis arrow points will be referred to as the +X side, and the opposite side as the -X side; the side in which the Y-axis arrow points will be referred to as the +Y side, and the opposite side as the -Y side; and the side in which the Z-axis arrow points will be referred to as the +Z side, and the opposite side as the -Z side.

[0010] Hereinafter, in the drawings, the first direction D1 and the second direction D2 are shown as necessary. The first direction D1 is the direction in which the support surface of the support member faces. The first direction D1 is a direction intersecting the longitudinal direction. In the following description, the side toward which the arrow of the first direction D1 points is called the +D1 side, and the opposite side is called the -D1 side. The second direction D2 is the direction in which the heat transfer member extends. The second direction D2 is a direction intersecting the longitudinal direction. In the following description, the side toward which the arrow of the second direction D2 points is called the +D2 side, and the opposite side is called the -D2 side.

[0011] (First Embodiment) FIG. 1 is a schematic configuration diagram of the projector 1 of the present embodiment. As shown in FIG. 1, the projector 1 is a projection-type image display device that displays a color image on a screen SCR that is a projection surface. The projector 1 includes three light modulation devices 4R, 4G, and 4B corresponding to each color light of red light LR, green light LG, and blue light LB. The projector 1 includes a first illumination device 20, a second illumination device 80, a color separation optical system 3, light modulation devices 4R, 4G, 4B, a light combining element 5, and a projection optical device 6.

[0012] The first illumination device 20 emits the yellow second light L2 toward the color separation optical system 3. The second light L2 is light emitted from a light source device 21 included in the first illumination device 20. The second illumination device 80 emits blue light LB toward the light modulation device 4B. Details of the first illumination device 20 and the second illumination device 80 will be described later.

[0013] The first optical axis J1 appropriately shown in each figure is the central axis of the second light L2 emitted from the first illumination device 20. The second optical axis J2 shown in FIG. 1 is the central axis of the blue light LB emitted from the second illumination device 80. The first optical axis J1 and the second optical axis J2 extend in a direction parallel to the longitudinal direction (X-axis direction).

[0014] The color separation optical system 3 separates the yellow second light L2 emitted from the first illumination device 20 into red light LR and green light LG. The color separation optical system 3 includes a dichroic mirror 7, a first reflection mirror 8a, and a second reflection mirror 8b.

[0015] The dichroic mirror 7 separates the second light L2 into red light LR and green light LG. The dichroic mirror 7 transmits the red light LR and reflects the green light LG. The second reflection mirror 8b is disposed in the optical path of the green light LG. The second reflection mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the optical modulation device 4G. The first reflection mirror 8a is disposed in the optical path of the red light LR. The first reflection mirror 8a reflects the red light LR transmitted through the dichroic mirror 7 toward the optical modulation device 4R.

[0016] The blue light LB emitted from the second illumination device 80 is reflected by the reflection mirror 9 toward the optical modulation device 4B. The second illumination device 80 includes a second light source unit 81, a condenser lens 82, a diffusion plate 83, a rod lens 84, and a relay lens 85. The second light source unit 81 is composed of at least one semiconductor laser. The second light source unit 81 emits blue light LB composed of laser light toward the condenser lens 82. Note that the second light source unit 81 is not limited to a semiconductor laser and may be composed of an LED that emits blue light.

[0017] The condenser lens 82 is composed of a convex lens. The condenser lens 82 makes the blue light LB emitted from the second light source unit 81 incident on the diffusion plate 83 in a state where the blue light LB is condensed. The diffusion plate 83 generates blue light LB having a uniform light distribution by diffusing the blue light LB emitted from the condenser lens 82 with a predetermined diffusion degree. The diffusion plate 83 is composed of, for example, ground glass made of optical glass.

[0018] The blue light LB diffused by the diffusion plate 83 is incident on the rod lens 84. The rod lens 84 has a prismatic shape extending along the direction of the second optical axis J2. The rod lens 84 has a light incident end face 84a provided at one end and a light emission end face 84b provided at the other end. The diffusion plate 83 is fixed to the light incident end face 84a of the rod lens 84 via an optical adhesive (not shown). It is desirable that the refractive index of the diffusion plate 83 and the refractive index of the rod lens 84 coincide as much as possible.

[0019] The blue light LB propagates through the inside of the rod lens 84 while undergoing total internal reflection, and is emitted from the light-emitting end face 84b with enhanced uniformity of illumination distribution. The blue light LB emitted from the rod lens 84 is incident on the relay lens 85. The relay lens 85 causes the blue light LB, whose uniformity of illumination distribution has been enhanced by the rod lens 84, to be incident on the reflection mirror 9. The shape of the light-emitting end face 84b of the rod lens 84 is a rectangle that is approximately similar in shape to the image-forming region of the optical modulator 4B. As a result, the blue light LB emitted from the rod lens 84 is efficiently incident on the image-forming region of the optical modulator 4B.

[0020] The optical modulator 4R modulates the red light LR according to the image information to form image light corresponding to the red light LR. The optical modulator 4G modulates the green light LG according to the image information to form image light corresponding to the green light LG. The optical modulator 4B modulates the blue light LB according to the image information to form image light corresponding to the blue light LB. For each of the optical modulators 4R, 4G, and 4B, for example, a transmissive liquid crystal panel can be used. Polarizing plates (not shown) are placed on the incident and exit sides of each of the optical modulators 4R, 4G, and 4B. The polarizing plates allow only linearly polarized light in a specific direction to pass through. As described above, the red light LR and green light LG are light obtained by separating the second light L2 by the dichroic mirror 7. Therefore, the optical modulators 4R and 4G modulate the second light L2, i.e., the light emitted from the light source device 21.

[0021] A field lens 10R is positioned on the incident side of the optical modulator 4R. The field lens 10R parallelizes the principal rays of the red light LR incident on the optical modulator 4R. A field lens 10G is positioned on the incident side of the optical modulator 4G. The field lens 10G parallelizes the principal rays of the green light LG incident on the optical modulator 4G. A field lens 10B is positioned on the incident side of the optical modulator 4B. The field lens 10B parallelizes the principal rays of the blue light LB incident on the optical modulator 4B.

[0022] The photosynthetic element 5 synthesizes the modulated image light from each of the light modulators 4R, 4G, and 4B, and emits the synthesized image light toward the projection optical device 6. For example, a cross dichroic prism can be used as the photosynthetic element 5.

[0023] The projection optical device 6 consists of multiple projection lenses (not shown). The projection optical device 6 magnifies and projects the image light synthesized in the photosynthesis element 5 toward the screen SCR. The projection optical device 6 projects the light modulated by the light modulators 4R, 4G, and 4B toward the screen SCR. As a result, a color image is displayed on the screen SCR.

[0024] Figure 2 is a schematic diagram of the first illumination device 20. Figure 3 is a plan view of the light source device 21 as seen from the first direction D1. Figure 4 is a cross-sectional view of the light source device 21 along the line IV-IV in Figure 3. Figure 5 is a cross-sectional view of the light source device 21 along the line VV in Figure 3. Figure 6 is a cross-sectional view of the light source device 21 along the line VI-VI in Figure 3. As shown in Figure 2, the first illumination device 20 comprises a light source device 21, an integrator optical system 50, a polarization conversion element 55, and a superimposed optical system 56. In other words, the projector 1 includes a light source device 21.

[0025] In this embodiment, the first direction D1 is parallel to the incident direction (Y-axis direction). The first direction D1 is perpendicular to the longitudinal direction (X-axis direction). In this embodiment, the second direction D2 is a direction that intersects both the longitudinal direction and the first direction D1. In this embodiment, the second direction D2 is parallel to the Z-axis direction. In this embodiment, the second direction D2 is perpendicular to both the longitudinal direction and the first direction D1. Note that the second direction D2 does not have to be perpendicular to at least one of the longitudinal direction and the first direction D1. In this case, the angle between the second direction D2 and the longitudinal direction should be 45° or more.

[0026] The light source device 21 converts the first light L1 into a yellow second light L2 and emits the second light L2 toward the integrator optical system 50. The light source device 21 comprises a wavelength conversion member 30, a light source unit 34, an angle conversion member 38, a mirror 40, and a support member 41. As shown in Figure 3, the light source device 21 includes a pressing member 61. The wavelength conversion member 30 in this embodiment corresponds to the "light guide member" in the claims. Therefore, the light source device 21 includes a light guide member.

[0027] The wavelength conversion member 30 has a rectangular prism shape extending along its longitudinal direction (X-axis direction) and has six faces. The longitudinal dimension of the wavelength conversion member 30 is larger than the dimensions in the incident direction (Y-axis direction) and the Z-axis direction. The dimensions in the incident direction and the Z-axis direction of the wavelength conversion member 30 are approximately the same. Therefore, the cross-sectional shape of the wavelength conversion member 30 when cut by a plane perpendicular to the longitudinal direction is approximately square. The cross-sectional shape of the wavelength conversion member 30 when cut by a plane perpendicular to the longitudinal direction may be other shapes such as a rectangle. Furthermore, the wavelength conversion member 30 does not necessarily have to have a rectangular prism shape; for example, it may have shapes such as a triangular prism or a cylinder.

[0028] The wavelength conversion member 30 has a first surface 30a and a second surface 30b that are perpendicular to the incident direction (Y-axis direction) and located on opposite sides of the incident direction to each other. The second surface 30b is located on the +Y side of the first surface 30a. The first surface 30a and the second surface 30b face opposite sides to each other. The wavelength conversion member 30 has a third surface 30c and a fourth surface 30d that are perpendicular to the longitudinal direction (X-axis direction) and located on opposite sides of the longitudinal direction to each other. The fourth surface 30d is located on the -X side than the third surface 30c. The third surface 30c and the fourth surface 30d face opposite each other. As shown in Figure 4, the wavelength conversion member 30 has a fifth surface 30e and a sixth surface 30f that are perpendicular to the Z-axis direction and located on opposite sides of the Z-axis direction from each other. The sixth surface 30f is located on the -Z side of the fifth surface 30e. The fifth surface 30e and the sixth surface 30f face opposite each other.

[0029] As shown in Figure 2, the wavelength conversion member 30 includes a phosphor 33 and converts the first light L1, which has a first wavelength band, emitted from the light source unit 34, into a second light L2, which has a second wavelength band different from the first wavelength band. The wavelength conversion member 30 emits the second light L2 toward the angle conversion member 38. The first light L1 is emitted from the light source unit 34 in the incident direction (Y-axis direction) and enters the wavelength conversion member 30 from the first surface 30a. The second light L2 is guided through the inside of the wavelength conversion member 30 and then emitted toward the angle conversion member 38 from the third surface 30c.

[0030] In this embodiment, the phosphor 33 is a ceramic phosphor made of a polycrystalline phosphor that converts the first light L1 to the second light L2. The second wavelength band of the second light L2 is, for example, the yellow wavelength band of 490 nm to 900 nm. That is, the second light L2 is yellow fluorescence containing red and green light components. Note that the phosphor 33 may be a single-crystal phosphor. The wavelength conversion member 30 may be made of fluorescent glass. The wavelength conversion member 30 may be made of a material in which a large number of phosphor particles are dispersed in a binder made of glass or resin.

[0031] In this embodiment, the wavelength conversion member 30 contains, for example, a yttrium aluminum garnet (YAG) phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, the material used for the wavelength conversion member 30 may be a material obtained by mixing raw material powders containing constituent elements such as Y2O3, Al2O3, and CeO3 and performing a solid-phase reaction, Y-Al-O amorphous particles obtained by wet methods such as the coprecipitation method and the sol-gel method, or YAG particles obtained by gas-phase methods such as the spray drying method, flame decomposition method and the thermal plasma method.

[0032] When the first light L1 is incident on the wavelength conversion member 30, the phosphor 33 absorbs the first light L1 and emits the second light L2 having a second wavelength band. As a result, the wavelength conversion member 30 converts the first light L1 into the second light L2. When the phosphor 33 absorbs the first light L1, the phosphor 33 generates heat. This causes the temperature of the wavelength conversion member 30 to rise.

[0033] The light source unit 34 irradiates the wavelength conversion member 30 with the first light L1. The light source unit 34 is positioned opposite the first surface 30a of the wavelength conversion member 30 in the incident direction (Y-axis direction). As shown in Figure 4, the light source unit 34 has a substrate 35 and a light-emitting element 36. The light source unit 34 may also have other optical elements such as a light guide plate, a diffuser plate, and a lens.

[0034] The substrate 35 is plate-shaped, extending in a direction perpendicular to the incident direction (Y-axis direction). Viewed from the incident direction, the substrate 35 is approximately rectangular in shape, with its longer side extending in the longitudinal direction (X-axis direction). The substrate 35 has a surface 35a. Surface 35a is the outer surface of the substrate 35 facing the +Y side. Surface 35a faces the wavelength conversion member 30 in the incident direction.

[0035] The light-emitting element 36 is mounted on the surface 35a of the substrate 35. The light-emitting element 36 is composed of, for example, a light-emitting diode (LED). The light-emitting element 36 has a light-emitting surface 36a. The light-emitting surface 36a faces the first surface 30a of the wavelength conversion member 30 in the incident direction (Y-axis direction). The light-emitting element 36 emits first light L1 having a first wavelength band, i.e., light, from its light-emitting surface 36a toward the first surface 30a of the wavelength conversion member 30. As a result, the first light L1 emitted from the light-emitting element 36 is incident on the wavelength conversion member 30. As shown in Figure 2, the wavelength conversion member 30 converts the first light L1 into second light L2 and emits the second light L2. In this embodiment, the first wavelength band is, for example, a wavelength band from blue to violet, from 400 nm to 480 nm. The peak wavelength of the first light L1 is, for example, 445 nm.

[0036] The light source unit 34 has a plurality of light-emitting elements 36. In this embodiment, the light source unit 34 has four light-emitting elements 36. Each light-emitting element 36 is arranged at intervals along the longitudinal direction (X-axis direction). Each light-emitting element 36 faces the first surface 30a in the incident direction (Y-axis direction). The number of light-emitting elements 36 in the light source unit 34 is not particularly limited and may be three or fewer, or five or more.

[0037] The support member 41 supports the wavelength conversion member 30, i.e., the light guide member. Heat generated in the wavelength conversion member 30 is transferred to the support member 41, and this heat is dissipated to the outside of the light source device 21. As shown in Figure 5, the support member 41 has a holding portion 42 and a heat transfer member 70.

[0038] As shown in Figure 6, the holding portion 42 extends in the longitudinal direction (X-axis direction) and holds the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the holding portion 42, and this heat is dissipated from the outer surface of the holding portion 42 to the outside of the light source device 21. For this reason, it is desirable that the holding portion 42 be made of a material that has a predetermined strength and high thermal conductivity. As the material that makes up the holding portion 42, aluminum and stainless steel can be used, and it is particularly desirable to use an aluminum alloy such as the 6061 series. In this embodiment, the holding portion 42 is made of aluminum. As shown in Figure 4, when viewed from the longitudinal direction, the holding portion 42 has a U-shape. As shown in Figure 3, the holding portion 42 has a support groove 42a, a side wall portion 42c, a first housing portion 48a, a second housing portion 48b, a third housing portion 48c, a fourth housing portion 48d, a fifth housing portion 48e, a sixth housing portion 48f, a recess 49a, and a fixing portion 49c. As shown in Figure 6, the retaining portion 42 has a housing hole 42k.

[0039] As shown in Figure 4, the support groove 42a is a groove that recesses from the -Y-facing surface of the holding portion 42 toward the +Y side. As shown in Figure 3, the support groove 42a extends in the longitudinal direction (X-axis direction). The wavelength conversion member 30 is housed in the support groove 42a. As shown in Figure 4, the support groove 42a has a support surface 43 and a side wall surface 44. That is, the support member 41 has a support surface 43.

[0040] The support surface 43 is the inner surface of the support groove 42a facing the -Y side. In other words, the support surface 43 is the surface facing the -D1 side. That is, the support surface 43 faces the first direction D1. The support surface 43 supports the second surface 30b of the wavelength conversion member 30 in the incident direction (Y axis direction). In this way, the support surface 43 supports the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the holding part 42 via the support surface 43.

[0041] The side wall portion 42c is the portion of the holding portion 42 that faces the wavelength conversion member 30 in the Z-axis direction. In this embodiment, the holding portion 42 has two side wall portions 42c. The two side wall portions 42c include a first side wall portion 42e and a second side wall portion 42f.

[0042] The first side wall portion 42e is the part of the holding portion 42 located on the +Z side of the support groove 42a. The first side wall portion 42e faces the fifth surface 30e of the wavelength conversion member 30 with a gap in the Z direction. The second side wall portion 42f is the part of the holding portion 42 located on the -Z side of the support groove 42a. The second side wall portion 42f faces the sixth surface 30f of the wavelength conversion member 30 with a gap in the Z direction.

[0043] The side wall surface 44 is the inner surface of the support groove 42a that faces the wavelength conversion member 30 in the Z-axis direction. In this embodiment, the support groove 42a has two side wall surfaces 44. The two side wall surfaces 44 include a first side wall surface 45 and a second side wall surface 46.

[0044] The first side wall surface 45 is the outer surface of the first side wall portion 42e facing the -Z side. The first side wall surface 45 faces the fifth surface 30e of the wavelength conversion member 30. The first side wall surface 45 has a first side portion 45a located on the side farther from the support surface 43, and a second side portion 45b located on the side closer to the support surface 43. The first side portion 45a extends in a direction perpendicular to the support surface 43. The second side portion 45b is an inclined surface that approaches the wavelength conversion member 30 as it approaches the support surface 43.

[0045] The second side wall surface 46 is the outer surface of the second side wall portion 42f facing the +Z side. The second side wall surface 46 faces the sixth surface 30f of the wavelength conversion member 30. The second side wall surface 46 has a third side portion 46a located on the side farther from the support surface 43, and a fourth side portion 46b located on the side closer to the support surface 43. The third side portion 46a extends in a direction perpendicular to the support surface 43. The fourth side portion 46b is an inclined surface that approaches the wavelength conversion member 30 as it approaches the support surface 43.

[0046] As shown in Figure 3, the first housing portion 48a is a recess that communicates with the +X side end of the support groove 42a. The first housing portion 48a penetrates to the +X side outer edge 42h of the holding portion 42. The first housing portion 48a accommodates the first protrusion 32a of the wavelength conversion member 30 that protrudes from the support groove 42a towards the +X side. The first housing portion 48a also holds the angle conversion member 38 fixed to the third surface 30c of the wavelength conversion member 30.

[0047] The second housing portion 48b is a recess that communicates with the -X side end of the support groove 42a. The second housing portion 48b penetrates to the -X side outer edge 42h of the holding portion 42. The second housing portion 48b accommodates the second protrusion 32c of the wavelength conversion member 30 that protrudes from the support groove 42a toward the -X side. The second housing portion 48b also accommodates the mirror 40 provided on the fourth surface 30d of the wavelength conversion member 30.

[0048] The third housing portion 48c is a recess extending from the first housing portion 48a toward the +Z side. The third housing portion 48c houses the position regulating portion 66a that holds the portion of the first protrusion 32a toward the +Z side.

[0049] The fourth housing portion 48d is a recess extending from the first housing portion 48a toward the -Z side. The fourth housing portion 48d houses the position regulating portion 66b that holds the -Z side portion of the first protrusion 32a.

[0050] The fifth housing portion 48e is a recess extending in the +Z direction from the second housing portion 48b. The fifth housing portion 48e houses the position regulating portion 66c that holds the +Z side portion of the second protrusion 32c.

[0051] The sixth housing section 48f is a recess extending in the -Z direction from the second housing section 48b. The sixth housing section 48f houses the position regulating section 66d that holds the -Z side portion of the second protrusion 32c.

[0052] The position restricting parts 66a, 66b, 66c, and 66d hold the first or second protruding part 32a or second protruding part 32c that protrudes longitudinally (in the X-axis direction) from the support groove 42a of the holding part 42, and restrict the position of the wavelength conversion member 30 relative to the support groove 42a. Each position restricting part 66a, 66b, 66c, and 66d is fixed to the holding part 42 by a screw 68. The positions of the position restricting parts 66a and 66b can be adjusted relative to each other in the Z-axis direction by an adjustment mechanism (not shown). Similarly, the positions of the position restricting parts 66c and 66d can be adjusted relative to each other in the Z-axis direction by an adjustment mechanism (not shown).

[0053] As shown in Figure 5, the recess 49a is a hole recessed to the +Y side from the -Y side surface of the retaining portion 42. More specifically, the recess 49a is a hole recessed to the +Y side from the -Y side surface of the first side wall portion 42e and the -Y side surface of the second side wall portion 42f, respectively. The interior of the recess 49a connects to the interior of the support groove 42a. The dimension of the recess 49a in the incident direction (Y-axis direction) is smaller than the dimension of the support groove 42a in the incident direction. The dimension of the recess 49a in the Z-axis direction is larger than the dimension of the support groove 42a in the Z-axis direction. As shown in Figure 3, viewed from the incident direction, the recess 49a is substantially rectangular in shape with its long side extending in the Z-axis direction. The retaining portion 42 has a plurality of recesses 49a. In this embodiment, the retaining portion 42 has two recesses 49a. Each recess 49a is spaced apart from each other in the longitudinal direction (X-axis direction).

[0054] As shown in Figure 5, the fixing portion 49c is the surface of the inner surface of the recess 49a facing the -Y side. More specifically, the fixing portion 49c is composed of the surface of the first side wall portion 42e facing the -Y side and the surface of the second side wall portion 42f facing the -Y side. The pressing member 61 is fixed to the fixing portion 49c. As shown in Figure 3, the holding portion 42 has a plurality of fixing portions 49c. In this embodiment, the holding portion 42 has two fixing portions 49c. Different pressing members 61 are fixed to each fixing portion 49c. The two fixing portions 49c include a first fixing portion 49d and a second fixing portion 49e.

[0055] The first fixing portion 49d is the surface facing the -Y side of the recess 49a located on the +X side of the two recesses 49a. The second fixing portion 49e is the surface facing the -Y side of the recess 49a located on the -X side of the two recesses 49a. The first fixing portion 49d and the second fixing portion 49e are spaced apart from each other in the longitudinal direction (X-axis direction). That is, the multiple fixing portions 49c are spaced apart from each other in the longitudinal direction. As shown in Figure 5, each fixing portion 49c is provided with two holes 49g. Each hole 49g is a female screw hole recessed toward the +Y side from the fixing portion 49c. In each fixing portion 49c, one hole 49g is recessed toward the +Y side from the surface facing the -Y side of the first side wall portion 42e. In each fixing portion 49c, the other hole 49g is recessed toward the +Y side from the surface facing the -Y side of the second side wall portion 42f. The two holes 49g provided in each fixing portion 49c are arranged along the Z-axis direction, flanking the support groove 42a.

[0056] As shown in Figure 5, the housing hole 42k is a hole recessed toward the -D2 side from the +D2 side surface of the retaining portion 42. That is, the housing hole 42k is a hole extending in the second direction D2. The housing hole 42k may also be a hole that penetrates the retaining portion 42 in the second direction D2. The housing hole 42k is provided on the +D1 side of the support groove 42a. As shown in Figure 6, as viewed from the second direction D2, the housing hole 42k is substantially circular in shape. As viewed from the second direction D2, the housing hole 42k may also have other shapes such as triangular and square shapes. The heat transfer member 70 is housed inside the housing hole 42k. The retaining portion 42 has a plurality of housing holes 42k. In this embodiment, the retaining portion 42 has 6 housing holes 42k. The number of housing holes 42k in the retaining portion 42 may be 5 or less, or 7 or more. Each of the housing holes 42k is spaced apart from one another along the longitudinal direction (X-axis direction). As shown in Figure 3, when viewed from the first direction D1, a portion of each housing hole 42k overlaps with the wavelength conversion member 30.

[0057] As shown in Figure 2, the mirror 40 is provided on the fourth surface 30d of the wavelength conversion member 30. The mirror 40 guides light through the interior of the wavelength conversion member 30 and reflects the second light L2 that reaches the fourth surface 30d toward the third surface 30c. The mirror 40 is made of a metal film or dielectric multilayer film formed on the fourth surface 30d of the wavelength conversion member 30.

[0058] The first light L1 emitted from the light-emitting element 36 toward the first surface 30a enters the interior of the wavelength conversion member 30 from the first surface 30a. When the first light L1 enters the interior of the wavelength conversion member 30, the phosphor 33 is excited by the first light L1 and emits second light L2. The second light L2 propagates radially from the phosphor 33. The second light L2, traveling toward the first surface 30a, the second surface 30b, the fifth surface 30e, and the sixth surface 30f of the wavelength conversion member 30, undergoes repeated total internal reflection at each surface 30a, 30b, 30e, and 30f, and then travels toward the third surface 30c or the fourth surface 30d. The second light L2 traveling toward the fourth surface 30d is reflected by the mirror 40 and travels toward the third surface 30c. As a result, the second light L2 emitted by the phosphor 33 travels toward the third surface 30c, passes through the third surface 30c, and enters the angle conversion member 38. As described above, when the phosphor 33 absorbs the first light L1, the phosphor 33 generates heat. This causes the temperature of the wavelength conversion member 30 to rise.

[0059] The angle conversion member 38 is provided on the emission side of the third surface 30c of the wavelength conversion member 30. The second light L2 emitted from the third surface 30c is incident on the angle conversion member 38. The angle conversion member 38 is made of a translucent material such as a tapered rod. The angle conversion member 38 has an incident surface 38a into which the second light L2 emitted from the wavelength conversion member 30 is incident, an emission surface 38b that emits the second light L2, and a reflective side surface 38c that reflects the second light L2 toward the emission surface 38b. The incident surface 38a faces the third surface 30c in the longitudinal direction (X-axis direction).

[0060] The angle conversion member 38 has a truncated square pyramidal shape, and the cross-sectional area of ​​the section perpendicular to the first optical axis J1 widens along the direction of propagation of the second light L2. Therefore, the area of ​​the emission surface 38b is larger than the area of ​​the incident surface 38a. In this embodiment, the optical axis of the angle conversion member 38 coincides with the first optical axis J1.

[0061] The second light L2 incident on the angle conversion member 38 changes its direction of travel each time it undergoes total internal reflection at the reflective surface 38c, so as to approach a direction parallel to the first optical axis J1. In this way, the angle conversion member 38 converts the emission angle distribution of the second light L2 emitted from the wavelength conversion member 30. More specifically, the angle conversion member 38 makes the maximum emission angle of the second light L2 at the emission surface 38b smaller than the maximum incident angle of the second light L2 at the incident surface 38a.

[0062] Generally, the etendu of light, which is defined by the product of the area of ​​the light emission region and the maximum emission angle (which is the solid angle of light), is preserved. Therefore, the etendu of the second light L2 is preserved before and after transmission through the angle conversion member 38. As described above, the angle conversion member 38 has a configuration in which the area of ​​the emission surface 38b is larger than the area of ​​the incident surface 38a. For this reason, from the viewpoint of etendu preservation, the angle conversion member 38 can make the maximum emission angle of the second light L2 at the emission surface 38b smaller than the maximum incident angle of the second light L2 at the incident surface 38a.

[0063] The angle conversion member 38 is fixed to the wavelength conversion member 30 via an optical adhesive (not shown) such that its incident surface 38a faces the third surface 30c of the wavelength conversion member 30. That is, the angle conversion member 38 and the wavelength conversion member 30 are in contact via the optical adhesive, and there is no gap, such as an air layer, between the angle conversion member 38 and the wavelength conversion member 30. If there were a gap between the angle conversion member 38 and the wavelength conversion member 30, the second light L2 that reaches the incident surface 38a of the angle conversion member 38 at an angle greater than or equal to the critical angle would undergo total internal reflection at the incident surface 38a and would not be incident on the angle conversion member 38. In contrast, as in this embodiment, if there is no gap between the angle conversion member 38 and the wavelength conversion member 30, the loss component of the second light L2 that cannot be incident on the angle conversion member 38 due to total internal reflection can be reduced. From this viewpoint, it is desirable that the refractive index of the angle conversion member 38 and the refractive index of the wavelength conversion member 30 match as much as possible.

[0064] The configuration of the angle conversion member 38 is not limited to this embodiment; for example, a compound parabolic concentrator (CPC) may be used. Even when a CPC is used as the angle conversion member 38, the same effect as when a tapered rod is used can be obtained. Furthermore, the light source device 21 does not need to be equipped with the angle conversion member 38.

[0065] The integrator optical system 50 has a first lens array 52 and a second lens array 53. The integrator optical system 50 functions as a uniform illumination optical system that homogenizes the intensity distribution of the second light L2 emitted from the light source device 21 together with the superimposed optical system 56 in the light modulation devices 4R and 4G, which are the illuminated regions. The second light L2 emitted from the emission surface 38b of the angle conversion member 38 is incident on the first lens array 52.

[0066] The first lens array 52 has a plurality of first small lenses 52a. Each first small lens 52a is arranged in a matrix on a plane perpendicular to the first optical axis J1. Each first small lens 52a divides the second light L2 emitted from the angle conversion member 38 into a plurality of partial light beams. The shape of each first small lens 52a is a rectangle that is approximately similar in shape to the image forming region of the optical modulators 4R, 4G. As a result, each of the partial light beams emitted from the first lens array 52 is efficiently incident on the image forming region of the optical modulators 4R, 4G.

[0067] The second lens array 53 is positioned on the exit side of the first lens array 52. ​​The second light L2 emitted from the first lens array 52 enters the second lens array 53. The second lens array 53 has a plurality of second small lenses 53a corresponding to the plurality of first small lenses 52a of the first lens array 52. ​​Each second small lens 53a is arranged in a matrix on a plane orthogonal to the first optical axis J1. Together with the superimposed optical system 56, the second lens array 53 images the second light L2 emitted from each first small lens 52a of the first lens array 52 near the image forming area of ​​the optical modulators 4R and 4G.

[0068] In this embodiment, each first small lens 52a of the first lens array 52 and each second small lens 53a of the second lens array 53 have the same size, but they may also have different sizes. Also, in this embodiment, the first small lens 52a of the first lens array 52 and the second small lens 53a of the second lens array 53 are positioned so that their optical axes coincide, but they may also be positioned eccentrically.

[0069] The polarization conversion element 55 includes a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the second light L2 emitted from the light source device 21 as is, while reflecting the other linearly polarized component in a direction perpendicular to the first optical axis J1; a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the first optical axis J1; and a phase difference plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into the other linearly polarized component. The polarization conversion element 55 converts the polarization direction of the second light L2 emitted from the second lens array 53. More specifically, the polarization conversion element 55 converts each partial beam of the second light L2, which is divided by the first lens array 52 and emitted from the second lens array 53, into linearly polarized light.

[0070] The second light L2, having passed through the polarization conversion element 55, is incident on the superimposed optical system 56. The superimposed optical system 56 works in cooperation with the integrator optical system 50 to form a uniform illumination optical system that homogenizes the intensity distribution of the second light L2 in the light modulation devices 4R and 4G, which are the illuminated regions. The superimposed optical system 56 causes the second light L2 to be incident on the color separation optical system 3.

[0071] The pressing member 61 shown in Figure 5 presses the wavelength conversion member 30, i.e., the light guide member, against the support surface 43. The pressing member 61 is a leaf spring extending in the Z-axis direction. The pressing member 61 is elastic. As shown in Figure 3, the light source device 21 comprises a plurality of pressing members 61. In this embodiment, the light source device 21 comprises two pressing members 61. Each pressing member 61 is located inside a different recess 49a. Each pressing member 61 is spaced apart from each other in the longitudinal direction (X-axis direction). Each of the plurality of pressing members 61 is fixed to a different fixing part 49c. More specifically, one pressing member 61 is fixed to a first fixing part 49d, and the other pressing member 61 is fixed to a second fixing part 49e.

[0072] As shown in Figure 5, elastic members 62 that can be elastically deformed in the incident direction (Y-axis direction) are positioned between one end of the pressing member 61 and the fixing part 49c, and between the other end of the pressing member 61 and the fixing part 49c. In this embodiment, the elastic member 62 is a coil spring. When the screw 63 is inserted into the hole at one end of the pressing member 61 and the hole at the other end of the pressing member 61 and tightened into the hole 49g, an elastic force directed toward the -Y side is applied to the pressing member 61 by the elastic member 62. This determines the position of the pressing member 61 in the incident direction, and the pressing member 61 is fixed to the fixing part 49c. The central part of the pressing member 61 in the Z-axis direction presses the first surface 30a of the wavelength conversion member 30 from the -Y side. More specifically, the pressing member 61 applies a pressing force Fp directed towards the +Y side to the wavelength conversion member 30, thereby pressing the second surface 30b of the wavelength conversion member 30 against the support surface 43. In this way, the pressing member 61 presses the wavelength conversion member 30 against the support surface 43.

[0073] As described above, the multiple pressing members 61 are arranged at intervals from each other in the longitudinal direction (X-axis direction). As shown in Figure 6, in this embodiment, the wavelength conversion member 30 has a first portion 30h and a second portion 30j. The first portion 30h is the portion of the wavelength conversion member 30 that overlaps with the pressing member 61 when viewed from the first direction D1. In this embodiment, the wavelength conversion member 30 has two first portions 30h. Each first portion 30h is arranged at intervals in the longitudinal direction. Each first portion 30h is pressed against the support surface 43 by the pressing member 61.

[0074] The second portion 30j is the portion of the wavelength conversion member 30 located between the two pressing members 61 in the longitudinal direction (X-axis direction). In the longitudinal direction, the second portion 30j is located between the two fixing portions 49c. Therefore, the pressing force exerted by the second portion 30j against the support surface 43 is smaller than the pressing force exerted by the first portion 30h against the support surface 43. Consequently, the thermal resistance between the second portion 30j and the support surface 43 is greater than the thermal resistance between the first portion 30h and the support surface 43.

[0075] As shown in Figure 5, the heat transfer member 70 is columnar in shape extending in the second direction D2. In this embodiment, the heat transfer member 70 is substantially cylindrical in shape extending in the second direction D2. The heat transfer member 70 may also be substantially cylindrical in shape extending in the second direction D2. The heat transfer member 70 is located inside the housing hole 42k. In this embodiment, the heat transfer member 70 is made of copper. The thermal conductivity of the heat transfer member 70 is greater than the thermal conductivity of the holding part 42. As shown in Figure 6, the support member 41 has a plurality of heat transfer members 70. In this embodiment, the support member 41 has 6 heat transfer members 70. The number of heat transfer members 70 in the support member 41 may be 5 or less, or 7 or more. Each heat transfer member 70 is located inside a different housing hole 42k. That is, each heat transfer member 70 is located inside the holding part 42. The plurality of heat transfer members 70 are arranged along the longitudinal direction (X-axis direction). In this embodiment, each heat transfer member 70 is fitted into the inner surface of the housing hole 42k. As a result, the holding portion 42 holds each heat transfer member 70. As shown in Figure 5, the outer surface of each heat transfer member 70 is in contact with the inner surface of the housing hole 42k. Note that each heat transfer member 70 may be fixed to the inner surface of the housing hole 42k with an adhesive.

[0076] As described above, the heat transfer member 70 is substantially cylindrical in shape and extends in the second direction D2. Furthermore, the thermal conductivity of the heat transfer member 70 is greater than that of the holding part 42. As a result, compared to the case where the support member 41 does not have the heat transfer member 70, the amount of heat H1 transferred from the center of the support member 41 in the second direction D2 to both ends of the support member 41 in the second direction D2 can be increased. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding part 42 facing the second direction D2 can be increased. This increases the amount of heat dissipated from the outer surface of the holding part 42 facing the second direction D2 to the outside of the light source device 21. Consequently, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 21 via the support member 41 can be increased. This prevents the temperature of the wavelength conversion member 30 from becoming too high.

[0077] As described above, when viewed from the first direction D1, a portion of each housing hole 42k overlaps with the wavelength conversion member 30. Therefore, as shown in Figure 3, when viewed from the first direction D1, the central portion of each heat transfer member 70 in the second direction D2 overlaps with the wavelength conversion member 30. In other words, when viewed from the first direction D1, at least a portion of the heat transfer member 70 overlaps with the wavelength conversion member 30, i.e., the light guide member. Also, as shown in Figure 6, when viewed from the first direction D1, the first portion 30h of the wavelength conversion member 30, i.e., the portion of the wavelength conversion member 30 that is pressed by the pressing member 61, overlaps with the heat transfer member 70. Note that when viewed from the first direction D1, the first portion 30h of the wavelength conversion member 30 does not necessarily have to overlap with the heat transfer member 70. Furthermore, in this embodiment, of the multiple heat transfer members 70, the third heat transfer member 70 positioned from the +X side and the fourth heat transfer member 70 positioned from the +X side each overlap with the second portion 30j of the wavelength conversion member 30 when viewed from the first direction D1. As described above, in the longitudinal direction (X-axis direction), the second portion 30j is located between the two fixed portions 49c. Thus, in this embodiment, in the longitudinal direction, at least a portion of the heat transfer member 70 is positioned between the multiple fixed portions 49c.

[0078] According to this embodiment, the light source device 21 includes a light source unit 34 having a light-emitting element 36 that emits a first light L1, i.e., light; a wavelength conversion member 30, i.e., a light guide member, to which the first light L1 emitted from the light-emitting element 36 is incident and which emits a second light L2, i.e., light; and a support member 41 that supports the wavelength conversion member 30. The support member 41 has a support surface 43 that supports the wavelength conversion member 30 and faces a first direction D1 that intersects the longitudinal direction (X-axis direction) in which the wavelength conversion member 30 extends; a heat transfer member 70 that extends in a second direction D2 that intersects the longitudinal direction; and a holding part 42 that holds the heat transfer member 70. The heat transfer member 70 is arranged inside the holding part 42, and the thermal conductivity of the heat transfer member 70 is greater than the thermal conductivity of the holding part 42. As described above, when the phosphor 33 of the wavelength conversion member 30 absorbs the first light L1, the phosphor 33 generates heat. The heat from the wavelength conversion member 30 is transferred to the support member 41 via the support surface 43 and dissipated from the outer surface of the support member 41 to the outside of the light source device 21. In contrast, in this embodiment, as described above, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding part 42 facing the second direction D2 can be increased by the heat transfer member 70. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 21 via the support member 41 can be increased, thus preventing the temperature of the wavelength conversion member 30 from becoming too high. Furthermore, since the temperature of the wavelength conversion member 30 can be prevented from becoming too high, the temperature quenching of the second light L2 in the wavelength conversion member 30 can be reduced. Therefore, the wavelength conversion efficiency of the wavelength conversion member 30 can be increased.

[0079] Furthermore, in this embodiment, compared to the case where the support member 41 does not have a heat transfer member 70, the amount of heat transferred from the support surface 43 to the outer surface of the holding portion 42 facing the second direction D2 can be increased, thereby reducing the temperature of the support surface 43. As a result, the temperature difference between the wavelength conversion member 30 and the support surface 43 can be increased, and the amount of heat transferred from the wavelength conversion member 30 to the holding portion 42 via the support surface 43 can be increased. Therefore, it is possible to more effectively suppress the temperature of the wavelength conversion member 30 from becoming too high.

[0080] According to this embodiment, the second direction D2 is a direction that intersects both the longitudinal direction (X-axis direction) and the first direction D1. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding part 42 facing the second direction D2 can be increased by the heat transfer member 70. This increases the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 21 via the support member 41. Consequently, it is possible to suppress the temperature of the wavelength conversion member 30 from becoming too high.

[0081] According to this embodiment, when viewed from the first direction D1, at least a portion of the heat transfer member 70 overlaps with the wavelength conversion member 30, i.e., the light guide member. Therefore, when viewed from the first direction D1, the distance between the heat transfer member 70 and the wavelength conversion member 30 can be shortened compared to the case where the heat transfer member 70 does not overlap with the wavelength conversion member 30. As a result, the thermal resistance between the heat transfer member 70 and the wavelength conversion member 30 can be reduced. This allows the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding portion 42 by the heat transfer member 70 to be more effectively increased. Consequently, the temperature of the wavelength conversion member 30 can be more effectively prevented from becoming too high.

[0082] According to this embodiment, the heat transfer member 70 is columnar or cylindrical, extending in the second direction D2. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding part 42 facing the second direction D2 can be increased by the heat transfer member 70. This increases the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 21 via the support member 41. Consequently, it is possible to prevent the temperature of the wavelength conversion member 30 from becoming too high.

[0083] According to this embodiment, the support member 41 has a plurality of heat transfer members 70, and the plurality of heat transfer members 70 are arranged along the longitudinal direction (Z-axis direction). Therefore, it is easy to reduce temperature variations of the wavelength conversion member 30 in the longitudinal direction. As a result, it is possible to suitably suppress the temperature of a part of the wavelength conversion member 30 from becoming too high in the longitudinal direction, and thus the overall temperature of the wavelength conversion member 30 can be more suitably reduced. Consequently, since the temperature quenching of the second light L2 can be reduced throughout the wavelength conversion member 30, the wavelength conversion efficiency of the wavelength conversion member 30 can be more suitably increased.

[0084] According to this embodiment, the light source device 21 includes a pressing member 61 that presses the wavelength conversion member 30, i.e., the light guide member, against the support surface 43. When viewed from the first direction D1, the first portion 30h, i.e., the portion of the wavelength conversion member 30 that is pressed by the pressing member 61, overlaps with the heat transfer member 70. Since the first portion 30h is pressed against the support surface 43 by the pressing member 61, the thermal resistance between the first portion 30h and the support surface 43 is small. Furthermore, in this embodiment, as described above, when viewed from the first direction D1, the first portion 30h overlaps with the heat transfer member 70. As a result, the thermal resistance between the first portion 30h and the heat transfer member 70 can be reduced. Therefore, in this embodiment, the amount of heat transferred from the wavelength conversion member 30 to the heat transfer member 70 can be more favorably increased. This allows for a more favorable increase in the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 21 via the support member 41. Therefore, it is possible to more effectively suppress the temperature of the wavelength conversion member 30 from becoming too high.

[0085] According to this embodiment, the light source device 21 includes a plurality of pressing members 61 arranged at intervals from each other in the longitudinal direction (X-axis direction), and the support member 41 has a plurality of fixing parts 49c arranged at intervals from each other in the longitudinal direction, each of the plurality of pressing members 61 is fixed to a different fixing part 49c, and at least a portion of the heat transfer member 70 is arranged between the plurality of fixing parts 49c in the longitudinal direction. As described above, the thermal resistance between the second part 30j, which is the part of the wavelength conversion member 30 between the plurality of fixing parts 49c, and the support surface 43 is greater than the thermal resistance between the first part 30h and the support surface 43. Therefore, if the heat transfer member 70 is not arranged between the plurality of fixing parts 49c in the longitudinal direction, the amount of heat transferred from the second part 30j to the holding part 42 tends to be small, and the temperature of the second part 30j tends to be high. In contrast, in this embodiment, since at least a portion of the heat transfer member 70 is positioned between a plurality of fixing portions 49c in the longitudinal direction, the amount of heat transferred from the portion of the support surface 43 that contacts the second portion 30j to the outer surface of the holding portion 42 facing the second direction D2 can be increased. As a result, the temperature difference between the second portion 30j and the support surface 43 can be increased, and the amount of heat transferred from the second portion 30j to the holding portion 42 can be increased. Therefore, it is possible to more effectively suppress the temperature of the second portion 30j of the wavelength conversion member 30 from becoming too high.

[0086] According to this embodiment, the light-emitting element 36 emits first light L1 having a first wavelength band, and the light-guiding member is a wavelength conversion member 30 that includes a phosphor 33 and converts the first light L1 into second light L2 having a second wavelength band different from the first wavelength band, and emits the second light L2. As described above, in this embodiment, it is possible to suppress the temperature of the wavelength conversion member 30 from becoming too high. Therefore, since the temperature quenching of the second light L2 in the wavelength conversion member 30 can be reduced, it is possible to suppress a decrease in the wavelength conversion efficiency of the wavelength conversion member 30.

[0087] According to this embodiment, the projector 1 comprises a light source device 21, optical modulators 4R, 4G, and 4B that modulate the light emitted from the light source device 21, and a projection optical device 6 that projects the light modulated by the optical modulators 4R, 4G, and 4B. As described above, in this embodiment, the wavelength conversion efficiency of the wavelength conversion member 30 can be increased, so the amount of second light L2 emitted from the wavelength conversion member 30 can be increased. As a result, the amount of first light L1 required to emit a predetermined amount of second light L2 can be reduced. Therefore, since the amount of first light L1 emitted by the light-emitting element 36 can be reduced, the power consumed by the projector 1 can be suppressed.

[0088] (Second Embodiment) The projector 201 of the second embodiment will be described below. The basic configuration of the projector 201 of this embodiment is the same as that of the projector 1 of the first embodiment. In the projector 201 of this embodiment, the heat transfer member 270 is a cylindrical heat pipe extending in the second direction D2. In the following description, components that are identical in form to those of the projector 1 of the first embodiment described above are denoted by the same reference numerals, and their descriptions are omitted.

[0089] Figure 7 is a plan view of the light source device 221 of this embodiment as seen from a first direction D1. Figure 8 is a cross-sectional view of the light source device 221 along the line VIII-VIII in Figure 7. As shown in Figure 8, the light source device 221 of the first illumination device 220 comprises a wavelength conversion member 30, a light source unit 34, an angle conversion member 38, a mirror 40, a support member 241, a pressing member 61, and a heat sink 275.

[0090] The support member 241 supports the wavelength conversion member 30. Heat generated by the wavelength conversion member 30 is transferred to the support member 241, and this heat is dissipated to the outside of the light source device 221. The support member 241 has a holding portion 42 and a heat transfer member 270. The configuration of the holding portion 42 in this embodiment is the same as the configuration of the holding portion 42 in the first embodiment described above.

[0091] As shown in Figure 7, the heat transfer member 270 extends in the second direction D2. As shown in Figure 8, the heat transfer member 270 in this embodiment is a cylindrical heat pipe. The thermal conductivity of the heat transfer member 270 in this embodiment is greater than that of the heat transfer member 70 in the first embodiment described above. The thermal conductivity of the heat transfer member 270 is greater than that of the holding portion 42. The heat transfer member 270 is located inside the housing hole 42k. The heat transfer member 270 contains a working fluid (not shown) inside a cylindrical pipe extending in the second direction D2. Metal materials such as copper and aluminum can be used as the material constituting the pipe. In this embodiment, the pipe is made of copper. Liquids such as water and ethanol can be used as the working fluid. In this embodiment, the working fluid is ethanol. The working fluid absorbs heat from the holding portion 42 and vaporizes in the central part in the second direction D2, and transfers heat to the holding portion 42 and condenses in the parts on both sides of the second direction D2. This increases the amount of heat H1 (see Figure 7) transferred from the central part of the support member 241 in the second direction D2 to both ends of the support member 241 in the second direction D2. As a result, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding part 42 facing the second direction D2 can be increased. Also, as shown in Figure 8, the working fluid absorbs heat from the -D1 side of the holding part 42, i.e., the part on the wavelength conversion member 30 side, vaporizes, and transfers heat to the +D1 side of the holding part 42, i.e., the part on the heat sink 275 side, and condenses. This increases the amount of heat H2 transferred from the -D1 side to the +D1 side of the support member 241. As a result, the amount of heat transferred from the wavelength conversion member 30 to the heat sink 275 can be increased. In this way, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 221 via the support member 241 can be increased.

[0092] The support member 241 has a plurality of heat transfer members 270. In this embodiment, the support member 241 has six heat transfer members 270. Each heat transfer member 270 is arranged inside a different housing hole 42k. The holding part 42 holds each heat transfer member 270.

[0093] As shown in Figure 7, when viewed from the first direction D1, at least a portion of the heat transfer member 270 overlaps with the wavelength conversion member 30. Also, as shown in Figure 8, when viewed from the first direction D1, the first portion 30h of the wavelength conversion member 30, that is, the portion of the wavelength conversion member 30 that is pressed by the pressing member 61, overlaps with the heat transfer member 270. Furthermore, in this embodiment, of the multiple heat transfer members 270, the third heat transfer member 270 positioned from the +X side and the fourth heat transfer member 270 positioned from the +X side each overlap with the second portion 30j of the wavelength conversion member 30 when viewed from the first direction D1. In other words, in the longitudinal direction (X-axis direction), at least a portion of the heat transfer member 270 is positioned between multiple fixing portions 49c. Other configurations of the support member 241 in this embodiment are the same as other configurations of the support member 41 in the first embodiment described above.

[0094] In this embodiment, each heat transfer member 270 is arranged at intervals in the longitudinal direction (X-axis direction), but each heat transfer member 270 may be connected to one another. In this case, the pipe of the heat transfer member has a plurality of portions extending in a second direction D2 which are arranged at intervals along the longitudinal direction, and portions extending in a first direction D1 for connecting each of the portions extending in the second direction D2.

[0095] The heat sink 275 is attached to the surface of the retaining portion 42 facing the +D1 side. That is, the heat sink 275 is attached to the outer surface of the retaining portion 42 that faces away from the support surface 43. The heat sink 275 is made of metal. In this embodiment, the heat sink 275 is made of aluminum. It is preferable that the thermal conductivity of the heat sink 275 is greater than that of the retaining portion 42. The heat sink 275 has a plurality of heat dissipation fins 275a.

[0096] Each heat sink 275a protrudes towards the +D1 side. Although not shown in the illustration, each heat sink 275a is plate-shaped and extends in the Z-axis direction. Each heat sink 275a is spaced apart from each other along the longitudinal direction (X-axis direction). Note that each heat sink 275a may be plate-shaped and extend in the longitudinal direction. In this case, each heat sink 275a is spaced apart from each other along the Z-axis direction. In this embodiment, since the heat sink 275 has multiple heat sinks 275a, the surface area of ​​the heat sink 275 can be increased. This increases the amount of heat dissipated from the support member 241 to the outside of the light source device 221 via the heat sink 275. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 221 via the support member 241 and the heat sink 275 can be increased. Other configurations of the light source device 221 in this embodiment are the same as other configurations of the light source device 21 in the first embodiment described above.

[0097] According to this embodiment, the heat transfer member 270 is a cylindrical heat pipe extending in the second direction D2. Therefore, as described above, the amount of heat H1 transferred from the central part of the support member 241 in the second direction D2 to both ends of the support member 241 in the second direction D2 can be increased. As a result, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding part 42 facing the second direction D2 can be increased by the heat transfer member 270. Consequently, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 221 via the support member 241 can be increased, thus more effectively preventing the temperature of the wavelength conversion member 30 from becoming too high.

[0098] According to this embodiment, the light source device 221 is equipped with a heat sink 275 attached to the outer surface of the holding portion 42, on the side facing away from the support surface 43. Therefore, as described above, the amount of heat dissipated from the support member 241 to the outside of the light source device 221 can be increased via the heat sink 275. Consequently, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 221 can be increased via the support member 241 and the heat sink 275, which can more effectively suppress the temperature of the wavelength conversion member 30 from becoming too high.

[0099] Furthermore, in this embodiment, as described above, the amount of heat H2 transferred from the -D1 side portion to the +D1 side portion of the support member 241 can be increased by the heat transfer member 270. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the heat sink 275 via the support member 241 can be increased. Consequently, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 221 via the support member 241 and the heat sink 275 can be more favorably increased, thereby more favorably preventing the temperature of the wavelength conversion member 30 from becoming too high.

[0100] (Third embodiment) The projector 301 of the third embodiment will be described below. The basic configuration of the projector 301 in this embodiment is the same as that of the projector 201 in the second embodiment. In this embodiment, the second direction D2 is a direction inclined from the longitudinal direction (X-axis direction) toward the first direction D1. In this embodiment, the second direction D2 is parallel to the first direction D1. The second direction D2 does not have to be parallel to the first direction D1. In the following description, components that are identical in form to those of the projector 201 in the second embodiment described above are denoted by the same reference numerals, and their descriptions are omitted.

[0101] Figure 9 is a plan view of the light source device 321 of this embodiment as seen from a first direction D1. Figure 10 is a cross-sectional view of the light source device 321 along line XX in Figure 9. As shown in Figure 10, the light source device 321 of the first illumination device 320 comprises a wavelength conversion member 30, a light source unit 34, an angle conversion member 38, a mirror 40, a support member 341, a pressing member 61, and a heat sink 275.

[0102] The support member 341 supports the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the support member 341, and this heat is dissipated to the outside of the light source device 321. The support member 341 has a holding portion 342 and a heat transfer member 370.

[0103] The holding portion 342 extends in the longitudinal direction (X-axis direction) and holds the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the holding portion 342, and this heat is dissipated from the outer surface of the holding portion 342 to the outside of the light source device 21. The holding portion 342 has a housing hole 342k.

[0104] The housing hole 342k is a hole recessed toward the -D2 side from the +D2 side surface of the holding portion 342. That is, the housing hole 342k is a hole extending in the second direction D2. The housing hole 342k is provided on the +D1 side of the support groove 42a. As shown in Figure 9, when viewed from the second direction D2, the housing hole 342k is substantially circular in shape. As shown in Figure 10, the heat transfer member 370 is housed inside the housing hole 342k. The holding portion 342 has a plurality of housing holes 342k. In this embodiment, the holding portion 342 has six housing holes 342k. As shown in Figure 9, each housing hole 342k is provided spaced apart from each other along the longitudinal direction (X-axis direction). When viewed from the first direction D1, each housing hole 342k overlaps with the wavelength conversion member 30. The other configurations of the holding portion 342 in this embodiment are the same as the other configurations of the holding portion 42 in the second embodiment described above.

[0105] As shown in Figure 10, the heat transfer member 370 is a cylindrical heat pipe extending in the second direction D2. The thermal conductivity of the heat transfer member 370 is greater than that of the holding portion 342. The heat transfer member 370 is located inside the housing hole 342k. The heat transfer member 370 contains a working fluid (not shown) inside the cylindrical pipe extending in the second direction D2. The working fluid absorbs heat from the -D1 side of the holding portion 342, i.e., the portion on the wavelength conversion member 30 side, vaporizes, and transfers heat to the +D1 side of the holding portion 342, i.e., the portion on the heat sink 275 side, and condenses. This increases the amount of heat H2 transferred from the -D1 side portion to the +D1 side portion of the support member 341. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding portion 342 facing the +D1 side can be increased. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 321 via the support member 341 can be increased. Furthermore, in this embodiment, the amount of heat H2 transferred from the -D1 side portion to the +D1 side portion of the support member 341 can be increased, thereby increasing the amount of heat transferred from the wavelength conversion member 30 to the heat sink 275. As a result, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 321 via the support member 341 can be increased.

[0106] The support member 341 has a plurality of heat transfer members 370. In this embodiment, the support member 341 has six heat transfer members 370. Each heat transfer member 370 is arranged inside a different housing hole 342k. The holding part 342 holds each heat transfer member 370.

[0107] As shown in Figure 9, when viewed from the first direction D1, at least a portion of the heat transfer member 370 overlaps with the wavelength conversion member 30. Also, as shown in Figure 10, when viewed from the first direction D1, the first portion 30h of the wavelength conversion member 30, that is, the portion of the wavelength conversion member 30 that is pressed by the pressing member 61, overlaps with the heat transfer member 370. Furthermore, in this embodiment, of the multiple heat transfer members 370, the third heat transfer member 370 positioned from the +X side and the fourth heat transfer member 370 positioned from the +X side each overlap with the second portion 30j of the wavelength conversion member 30 when viewed from the first direction D1. In other words, in the longitudinal direction (X-axis direction), at least a portion of the heat transfer member 370 is positioned between multiple fixing portions 49c. Other configurations of the support member 341 in this embodiment are the same as other configurations of the support member 241 in the second embodiment described above. The other configurations of the light source device 321 in this embodiment are the same as those of the light source device 221 in the second embodiment described above.

[0108] According to this embodiment, the second direction D2 is a direction inclined from the longitudinal direction (X-axis direction) toward the first direction D1. Therefore, as described above, the amount of heat H2 transferred from the -D1 side portion to the +D1 side portion of the support member 341 by the heat transfer member 370 can be increased. This increases the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding portion 342 facing the +D1 side. Consequently, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 321 via the support member 341 can be increased, thus effectively preventing the temperature of the wavelength conversion member 30 from becoming too high.

[0109] Furthermore, in this embodiment, as described above, the amount of heat transferred from the wavelength conversion member 30 to the heat sink 275 can be increased by the heat transfer member 370. This allows for a more favorable increase in the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 321. Therefore, it is possible to more favorably suppress the temperature of the wavelength conversion member 30 from becoming too high.

[0110] (Fourth Embodiment) The projector 401 of the fourth embodiment will be described below. The basic configuration of the projector 401 in this embodiment is the same as that of the projector 1 in the first embodiment. In this embodiment, the heat transfer member 470 is a plate-shaped vapor chamber that extends in the first direction D1. In the following description, components that are identical in form to those of the projector 1 in the first embodiment described above are denoted by the same reference numerals, and their descriptions are omitted.

[0111] Figure 11 is a plan view of the light source device 421 of this embodiment as seen from a first direction D1. Figure 12 is a cross-sectional view of the light source device along the line XII-XII in Figure 11. As shown in Figure 12, the light source device 421 of the first illumination device 420 comprises a wavelength conversion member 30, a light source unit 34, an angle conversion member 38, a mirror 40, a support member 441, a pressing member 61, and a heat sink 275.

[0112] The support member 441 supports the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the support member 441, and this heat is dissipated to the outside of the light source device 421. The support member 441 has a holding portion 442 and a heat transfer member 470.

[0113] The holding portion 442 extends in the longitudinal direction (X-axis direction) and holds the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the holding portion 442, and this heat is dissipated from the outer surface of the holding portion 442 to the outside of the light source device 21. The holding portion 442 has a housing hole 442k.

[0114] As shown in Figure 11, the housing hole 442k is a hole that recesses from the +D2 side of the retaining portion 442 toward the -D2 side. The housing hole 442k is a hole that extends in a direction perpendicular to the first direction D1. Viewed from the first direction D1, the housing hole 442k is approximately rectangular in shape with its longer side extending in the longitudinal direction (X-axis direction). As shown in Figure 12, viewed from the second direction D2, the housing hole 442k is approximately rectangular in shape with its longer side extending in the longitudinal direction. As shown in Figure 11, in the longitudinal direction, the +X side end of the housing hole 442k is in approximately the same position as the +X side end of the support groove 42a. In the longitudinal direction, the -X side end of the housing hole 442k is in approximately the same position as the -X side end of the support groove 42a. In the second direction D2, the -D2 side end of the housing hole 442k is in approximately the same position as the -D2 side end of the recess 49a. Viewed from the first direction D1, the housing hole 442k overlaps with the wavelength conversion member 30. As shown in Figure 12, the housing hole 442k is located on the +D1 side of the support groove 42a. The heat transfer member 470 is housed inside the housing hole 442k. Other configurations of the holding part 442 in this embodiment are the same as those of the holding part 42 in the first embodiment described above.

[0115] As shown in Figures 11 and 12, the heat transfer member 470 in this embodiment is a plate-shaped vapor chamber that extends in a direction intersecting the first direction D1. The thermal conductivity of the heat transfer member 470 is greater than that of the holding portion 442. In this embodiment, the heat transfer member 470 is plate-shaped and extends in a direction perpendicular to the first direction D1. The plate surface of the heat transfer member 470 faces the first direction D1. The plate surface of the heat transfer member 470 may also face a direction inclined from the first direction D1. The heat transfer member 470 is located inside the housing hole 442k. The holding portion 442 holds the heat transfer member 470. The heat transfer member 470 contains a working fluid (not shown) inside a hollow plate-shaped chamber that extends in a direction perpendicular to the first direction D1. The working fluid absorbs heat from the holding portion 442 in the central part of the second direction D2 and vaporizes, and then transfers heat to the holding portion 442 on both sides of the second direction D2 and condenses. As a result, as shown in Figure 11, the amount of heat H1 transferred from the central part of the support member 441 in the second direction D2 to both ends of the support member 441 in the second direction D2 can be increased. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding portion 442 facing the second direction D2 can be increased. Also, as shown in Figure 12, the working fluid absorbs heat from the -D1 side of the holding portion 442 and vaporizes, and then transfers heat to the +D1 side of the holding portion 442 and condenses. As a result, the amount of heat H2 transferred from the -D1 side to the +D1 side of the support member 441 can be increased. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the heat sink 275 can be increased. These features make it possible to increase the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 441.

[0116] The housing hole 442k may also be open to the +D1 side. In this case, the heat sink 275 can be attached to the surface of the heat transfer member 470 facing the +D1 side. This reduces the thermal resistance between the heat transfer member 470 and the heat sink 275. Therefore, the amount of heat transferred from the wavelength conversion member 30 to the heat sink 275 can be more effectively increased.

[0117] As shown in Figure 11, when viewed from the first direction D1, at least a portion of the heat transfer member 470 overlaps with the wavelength conversion member 30. Also, as shown in Figure 12, when viewed from the first direction D1, the first portion 30h of the wavelength conversion member 30, that is, the portion of the wavelength conversion member 30 that is pressed by the pressing member 61, overlaps with the heat transfer member 470. Furthermore, in this embodiment, when viewed from the first direction D1, the heat transfer member 470 overlaps with the second portion 30j of the wavelength conversion member 30. In other words, in the longitudinal direction (X-axis direction), at least a portion of the heat transfer member 470 is positioned between multiple fixing portions 49c. Other configurations of the support member 441 in this embodiment are the same as other configurations of the support member 41 in the first embodiment described above. Other configurations of the light source device 421 in this embodiment are the same as other configurations of the light source device 21 in the first embodiment described above.

[0118] According to this embodiment, the heat transfer member 470 is a plate-shaped vapor chamber that extends in a direction intersecting the first direction D1. Therefore, as described above, the amount of heat H1 transferred from the central part of the support member 441 in the second direction D2 to both ends of the support member 441 in the second direction D2 can be increased by the heat transfer member 470. As a result, the amount of heat transferred from the wavelength conversion member 30 to the outer surface of the holding part 442 facing the second direction D2 can be increased. Consequently, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 441 can be increased, thus effectively preventing the temperature of the wavelength conversion member 30 from becoming too high.

[0119] Furthermore, in this embodiment, since the heat transfer member 470 is plate-shaped and extends in the longitudinal direction (X-axis direction), it is easy to suppress temperature variations on the support surface 43 in the longitudinal direction. Therefore, variations in the amount of heat transferred from the wavelength conversion member 30 to the support member 441 in the longitudinal direction can be suitably suppressed. As a result, temperature variations of the wavelength conversion member 30 in the longitudinal direction can be suitably suppressed. Therefore, it is possible to more suitably suppress the temperature of a part of the wavelength conversion member 30 from becoming too high in the longitudinal direction.

[0120] (Fifth embodiment) The projector 501 of the fifth embodiment will be described below. The basic configuration of the projector 501 in this embodiment is the same as that of the projector 401 in the fourth embodiment. In this embodiment, the support surface 543 includes the outer surface of the heat transfer member 470 that faces the first direction D1. In the following description, components that are identical in form to those of the projector 401 in the fourth embodiment described above are denoted by the same reference numerals, and their descriptions are omitted.

[0121] Figure 13 is a cross-sectional view showing the light source device 521 of this embodiment. As shown in Figure 13, the light source device 521 of the first illumination device 520 comprises a wavelength conversion member 30, a light source unit 34, an angle conversion member 38, a mirror 40, a support member 541, a pressing member 61, and a heat sink 275.

[0122] The support member 541 supports the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the support member 541, and this heat is dissipated to the outside of the light source device 521. The support member 541 has a holding portion 542, a heat transfer member 470, and a support surface 543.

[0123] The holding portion 542 extends in the longitudinal direction (X-axis direction) and holds the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the holding portion 542, and this heat is dissipated from the outer surface of the holding portion 542 to the outside of the light source device 21. The holding portion 542 has a housing hole 542k.

[0124] The housing hole 542k is a hole recessed toward the -D2 side from the +D2 side surface of the retaining portion 542. The housing hole 442k is a hole that extends in a direction perpendicular to the first direction D1. Although not shown in the figures, when viewed from the first direction D1, the housing hole 542k is substantially rectangular in shape with its longer side extending in the longitudinal direction (X-axis direction). The housing hole 542k is provided on the +D1 side of the support groove 42a. In this embodiment, the housing hole 542k is open toward the -D1 side. The heat transfer member 470 is housed inside the housing hole 542k. The other configurations of the retaining portion 542 in this embodiment are the same as the other configurations of the retaining portion 442 in the fourth embodiment described above.

[0125] The heat transfer member 470 in this embodiment is a plate-shaped vapor chamber that extends in a direction intersecting the first direction D1. The plate surface of the heat transfer member 470 faces the first direction D1.

[0126] The support surface 543 is the outer surface of the support member 541 facing the -D1 side. The support surface 543 supports the second surface 30b of the wavelength conversion member 30 in the incident direction (Y-axis direction). In this embodiment, the support surface 543 is composed of the inner surface of the support groove 42a facing the -D1 side and the outer support surface 470a of the heat transfer member 470 facing the -D1 side. That is, the support surface 543 includes the outer surface of the heat transfer member 470 facing the first direction D1. The outer support surface 470a is in direct contact with the wavelength conversion member 30. As a result, in this embodiment, the thermal resistance between the wavelength conversion member 30 and the heat transfer member 470 can be reduced, and the amount of heat transferred from the wavelength conversion member 30 to the heat transfer member 470 can be suitably increased. Other configurations of the support member 541 in this embodiment are the same as other configurations of the support member 441 in the fourth embodiment described above. The other configurations of the light source device 521 in this embodiment are the same as those of the light source device 421 in the fourth embodiment described above.

[0127] According to this embodiment, the plate surface of the heat transfer member 470 faces the first direction D1, and the support surface 543 includes the support outer surface 470a, that is, the outer surface of the heat transfer member 470 that faces the first direction D1. Therefore, as described above, the thermal resistance between the wavelength conversion member 30 and the heat transfer member 470 can be reduced, and the amount of heat transferred from the wavelength conversion member 30 to the heat transfer member 470 can be suitably increased. Consequently, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 521 via the support member 541 can be increased, and the temperature of the wavelength conversion member 30 can be suitably prevented from becoming too high.

[0128] (Sixth Embodiment) The projector 601 of the sixth embodiment will be described below. The basic configuration of the projector 601 in this embodiment is the same as that of the projector 201 in the second embodiment. In the projector 601 of this embodiment, the holding portion 642 has a first holding portion 651 and a second holding portion 652. In the following description, components that are identical in form to those of the projector 201 in the first embodiment described above are denoted by the same reference numerals, and their descriptions are omitted.

[0129] Figure 14 is a cross-sectional view showing the light source device 621 of this embodiment. As shown in Figure 14, the light source device 621 of the first illumination device 620 comprises a wavelength conversion member 30, a light source unit 34, an angle conversion member 38 (see Figure 3), a mirror 40 (see Figure 3), a support member 641, a pressing member 61 (see Figure 3), and a heat sink 275.

[0130] The support member 641 supports the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the support member 641, and this heat is dissipated to the outside of the light source device 621. The support member 641 has a holding portion 642 and a heat transfer member 270. The holding portion 642 has a first holding portion 651 and a second holding portion 652.

[0131] The first holding portion 651 has a support surface 43 that supports the wavelength conversion member 30. The dimensions of the first holding portion 651 in the incident direction (Y-axis direction) and the Z-axis direction are smaller than the dimensions of the holding portion 42 in the incident direction and the Z-axis direction of the holding portion 42 of the second embodiment. The other configurations of the first holding portion 651 in this embodiment are the same as the other configurations of the holding portion 42 of the second embodiment described above.

[0132] The second retaining portion 652 extends in the longitudinal direction (X-axis direction). The second retaining portion 652 holds the first retaining portion 651. In this embodiment, the second retaining portion 652 is made of aluminum. The second retaining portion 652 has a receiving groove 652a and a receiving hole 642k.

[0133] The housing groove 652a is a groove that recesses from the -Y-facing surface of the second retaining portion 652 toward the +Y side. Although not shown in the illustration, the housing groove 652a extends in the longitudinal direction (X-axis direction). Viewed from the longitudinal direction, the housing groove 652a is approximately rectangular in shape. The first retaining portion 651 is housed inside the housing groove 652a. In this embodiment, the first retaining portion 651 is fitted into the inner surface of the housing groove 652a. As a result, the second retaining portion 652 holds the first retaining portion 651. The first retaining portion 651 may be fixed to the inner surface of the housing groove 652a with an adhesive.

[0134] The housing hole 642k is a hole recessed toward the -D2 side from the +D2 side surface of the second holding portion 652. That is, the housing hole 642k is a hole extending in the second direction D2. The housing hole 642k is provided on the +D1 side of the support groove 42a. Although not shown in the figure, the housing hole 642k is approximately circular in shape when viewed from the second direction D2. Although not shown in the figure, the second holding portion 652 has six housing holes 642k. Each housing hole 642k is provided spaced apart from each other along the longitudinal direction (X-axis direction). A heat transfer member 270 is housed in each housing hole 642k. As a result, the heat transfer member 270 is positioned inside the second holding portion 652. The other configurations of the support member 641 in this embodiment are the same as the other configurations of the support member 241 in the second embodiment described above. The other configurations of the light source device 621 in this embodiment are the same as those of the light source device 221 in the second embodiment described above.

[0135] According to this embodiment, the holding portion 642 has a first holding portion 651 having a support surface 43, and a second holding portion 652 that holds the first holding portion 651, and the heat transfer member 270 is arranged inside the second holding portion 652. When the heat transfer member 270 is arranged inside the first holding portion 651, it is necessary to provide a hole in the first holding portion 651 to accommodate the heat transfer member 270. When such a hole is provided in the first holding portion 651 by machining such as cutting, there is a risk that the flatness of the support surface 43 of the first holding portion 651 will decrease. If the flatness of the support surface 43 decreases, the thermal resistance between the wavelength conversion member 30 and the support surface 43 will increase, and the amount of heat transferred from the wavelength conversion member 30 to the first holding portion 651 will decrease. In contrast, in this embodiment, the heat transfer member 270 is arranged inside the second holding portion 652. Therefore, it is not necessary to provide a hole in the first holding portion 651 to accommodate the heat transfer member 270. Therefore, since a decrease in the flatness of the support surface 43 can be suppressed, an increase in thermal resistance between the wavelength conversion member 30 and the support surface 43 can be suppressed. Therefore, since a decrease in the amount of heat transferred from the wavelength conversion member 30 to the first holding part 651 can be suppressed, the temperature of the wavelength conversion member 30 can be suppressed from becoming too high.

[0136] Furthermore, in this embodiment, the second holding portion 652 only needs to have the function of holding the first holding portion 651 and the heat transfer member 270 respectively, so high machining precision is not required for the second holding portion 652. Therefore, since the machining precision of the second holding portion 652, which is a part of the holding portion 642, can be reduced, it is possible to suppress an increase in the manufacturing cost and manufacturing man-hours of the support member 641.

[0137] Although embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. Furthermore, one aspect of the present invention can be a configuration that appropriately combines the characteristic features of each of the above embodiments.

[0138] In the above-described embodiment, an example was given in which the present invention is applied to a light source device equipped with a wavelength conversion member. However, instead of this configuration, the present invention may also be applied to a light source device that propagates incident light without wavelength conversion and then emits it, for example, by controlling the angular distribution. In this case, the wavelength conversion member in the above-described embodiment is replaced by the light guide member, and the light emitted from the light-emitting element is emitted to the angle conversion member as light in its original wavelength band.

[0139] The specific details regarding the shape, number, arrangement, materials, etc., of each component of the light source device and projector are not limited to the above embodiments and can be modified as appropriate. Furthermore, although the above embodiments show an example in which the light source device according to the present invention is mounted on a projector using a liquid crystal panel, the invention is not limited to this. The light source device according to the present invention may also be applied to a projector using a digital micromirror device as an optical modulator. In addition, the projector does not have to have multiple optical modulators, but may have only one optical modulator.

[0140] The above embodiment shows an example of applying the light source device of the present invention to a projector, but it is not limited to this. The light source device of the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

[0141] [Summary of this disclosure] A summary of this disclosure is provided below.

[0142] (Note 1) A light source device comprising: a light source unit having a light-emitting element that emits light; a light guide member into which the light emitted from the light-emitting element is incident and which emits light; and a support member that supports the light guide member, wherein the support member has a support surface that faces a first direction intersecting the longitudinal direction in which the light guide member extends and supports the light guide member, a heat transfer member that extends in a second direction intersecting the longitudinal direction, and a holding portion that holds the heat transfer member, wherein the heat transfer member is disposed inside the holding portion, and the thermal conductivity of the heat transfer member is greater than the thermal conductivity of the holding portion.

[0143] With this light source device configuration, the amount of heat transferred from the wavelength conversion member to the outer surface of the holding part facing the second direction can be increased by the heat transfer member. Therefore, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member can be increased, thus preventing the temperature of the wavelength conversion member from becoming too high.

[0144] (Note 2) The light source device as described in Appendix (1), wherein the second direction is a direction that intersects both the longitudinal direction and the first direction.

[0145] This configuration allows the heat transfer member to increase the amount of heat transferred from the wavelength conversion member to the outer surface of the holding part facing the second direction. This increases the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member. Therefore, it is possible to suppress the temperature of the wavelength conversion member from becoming too high.

[0146] (Note 3) The light source device as described in Appendix (1), wherein the second direction is a direction inclined from the longitudinal direction to the first direction.

[0147] This configuration allows for an increase in the amount of heat transferred from the wavelength conversion member to the outer surface of the holding part facing the +D1 side. Therefore, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member can be increased, effectively suppressing the temperature of the wavelength conversion member from becoming too high.

[0148] (Note 4) A light source device according to any one of the appendices (1) to (3), wherein, when viewed from the first direction, at least a portion of the heat transfer member overlaps with the light guide member.

[0149] This configuration allows for a shorter distance between the heat transfer member and the wavelength conversion member. Therefore, the thermal resistance between the heat transfer member and the wavelength conversion member can be reduced. This allows for a more favorable increase in the amount of heat transferred from the wavelength conversion member to the outer surface of the holding portion by the heat transfer member. Consequently, the temperature of the wavelength conversion member can be more effectively prevented from becoming excessively high.

[0150] (Note 5) The heat transfer member is columnar or cylindrical, extending in the second direction, as described in any of the appendices (1) to (4) of the light source device.

[0151] This configuration allows the heat transfer member to increase the amount of heat transferred from the wavelength conversion member to the outer surface of the holding part facing the second direction. This increases the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member. Therefore, it is possible to suppress the temperature of the wavelength conversion member from becoming too high.

[0152] (Note 6) The heat transfer member is a cylindrical heat pipe extending in the second direction, as described in any of the appendices (1) to (4) of the light source device.

[0153] With this configuration, the amount of heat transferred from the wavelength conversion member to the outer surface of the holding part facing the second direction can be increased by the heat transfer member. Therefore, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member can be increased, thus more effectively suppressing the temperature of the wavelength conversion member from becoming too high.

[0154] (Note 7) The light source device according to any one of the appendices (1) to (6), wherein the support member has a plurality of heat transfer members, and the plurality of heat transfer members are arranged along the longitudinal direction.

[0155] This configuration makes it easier to reduce temperature variations in the wavelength conversion member in the longitudinal direction. As a result, it is possible to effectively suppress the temperature of a part of the wavelength conversion member from becoming too high in the longitudinal direction, thereby more effectively reducing the overall temperature of the wavelength conversion member.

[0156] (Note 8) The light source device according to any one of the appendices (1) to (4), wherein the heat transfer member is a plate-shaped vapor chamber extending in a direction intersecting the first direction.

[0157] This configuration makes it easier to suppress temperature variations on the support surface in the longitudinal direction. Therefore, variations in the amount of heat transferred from the wavelength conversion member to the support member in the longitudinal direction can be suitably suppressed. As a result, temperature variations in the wavelength conversion member in the longitudinal direction can be suitably suppressed. Therefore, it is possible to more suitably prevent the temperature of a part of the wavelength conversion member from becoming too high in the longitudinal direction.

[0158] (Note 9) The light source device according to Appendix (8), wherein the plate surface of the heat transfer member faces the first direction, and the support surface includes the outer surface of the heat transfer member that faces the first direction.

[0159] This configuration allows for a reduction in thermal resistance between the wavelength conversion member and the heat transfer member, thereby effectively increasing the amount of heat transferred from the wavelength conversion member to the heat transfer member. Consequently, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member can be increased, effectively preventing the temperature of the wavelength conversion member from becoming too high.

[0160] (Note 10) A light source device according to any one of the appendices (1) to (9), comprising a pressing member for pressing the light guide member against the support surface, wherein, when viewed from the first direction, the portion of the light guide member pressed by the pressing member overlaps with the heat transfer member.

[0161] This configuration reduces the thermal resistance between the portion of the wavelength conversion member pressed by the pressing member and the heat transfer member. Therefore, the amount of heat transferred from the wavelength conversion member to the heat transfer member can be more effectively increased. This, in turn, allows for a more effectively increased amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member. Consequently, excessive temperature increases in the wavelength conversion member can be more effectively suppressed.

[0162] (Note 11) The light source device according to Appendix (10), comprising a plurality of pressing members arranged at intervals from each other in the longitudinal direction, wherein the support member has a plurality of fixing portions arranged at intervals from each other in the longitudinal direction, each of the plurality of pressing members is fixed to different fixing portions, and at least a portion of the heat transfer member is arranged between the plurality of fixing portions in the longitudinal direction.

[0163] This configuration allows for an increase in the amount of heat transferred from the portion of the support surface that contacts the area between the multiple fixed parts of the wavelength conversion member to the outer surface of the holding part facing the second direction. This increases the temperature difference between the area between the multiple fixed parts of the wavelength conversion member and the support surface, thereby increasing the amount of heat transferred from the second portion to the holding part. Consequently, it is possible to more effectively suppress the temperature of the area between the multiple fixed parts of the wavelength conversion member from becoming too high.

[0164] (Note 12) The light source device according to any one of the appendices (1) to (11), wherein the holding portion comprises a first holding portion having the support surface and a second holding portion that holds the first holding portion, and the heat transfer member is disposed inside the second holding portion.

[0165] With this configuration, there is no need to provide a hole in the first holding portion to accommodate the heat transfer member. Therefore, a decrease in the flatness of the support surface can be suppressed, and thus an increase in the thermal resistance between the wavelength conversion member and the support surface can be suppressed. Therefore, a decrease in the amount of heat transferred from the wavelength conversion member to the first holding portion can be suppressed, and thus the temperature of the wavelength conversion member can be prevented from becoming too high.

[0166] (Note 13) A light source device according to any one of the appendices (1) to (12), comprising a heat sink attached to the outer surface of the holding portion that faces away from the support surface.

[0167] This configuration allows for increased heat dissipation from the support member to the outside of the light source device via the heat sink. Therefore, since the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member and heat sink can be increased, it is possible to more effectively suppress the temperature of the wavelength conversion member from becoming too high.

[0168] (Note 14) The light source device according to any one of the appendices (1) to (13), wherein the light-emitting element emits first light having a first wavelength band, and the light guide member is a wavelength conversion member that includes a phosphor and converts the first light into second light having a second wavelength band different from the first wavelength band, and emits the second light.

[0169] This configuration prevents the temperature of the wavelength conversion member from becoming too high. Therefore, the temperature quenching of the second light in the wavelength conversion member can be reduced, thus preventing a decrease in the wavelength conversion efficiency of the wavelength conversion member.

[0170] (Note 15) A projector comprising a light source device described in any of the appendices (1) to (14), an optical modulator for modulating light emitted from the light source device, and a projection optical device for projecting light modulated by the optical modulator.

[0171] This projector configuration allows for increased wavelength conversion efficiency in the wavelength conversion element, thereby increasing the amount of second light emitted from the wavelength conversion element. This reduces the amount of first light required to emit a predetermined amount of second light. Consequently, the amount of first light emitted by the light-emitting element can be reduced, thus suppressing the power consumption of the projector. [Explanation of symbols]

[0172] 1, 201, 301, 401, 501, 601…Projector, 4R, 4G, 4B…Optical Modulator, 6…Projection Optical Device, 21, 221, 321, 421, 521, 621…Light Source Device, 30…Wavelength Conversion Member (Light Guide Member), 33…Phosphor, 34…Light Source Unit, 36…Light Emitting Device, 41, 241, 341, 441, 541, 641… Support member, 42, 342, 442, 542, 642... Holding part, 43, 543... Support surface, 49c... Fixing part, 61... Pressing member, 70, 270, 370, 470... Heat transfer member, 275... Heat sink, 651... First holding part, 652... Second holding part, D1... First direction, D2... Second direction, L1... First light (light), L2... Second light (light).

Claims

1. A light source unit having a light-emitting element that emits light, A light guide member into which the light emitted from the light-emitting element is incident and which emits light, A support member that supports the light guide member, Equipped with, The aforementioned support member is The light guide member has a support surface that faces a first direction intersecting the longitudinal direction in which the light guide member extends, and supports the light guide member, A heat transfer member extending in a second direction intersecting the longitudinal direction, A holding portion for holding the heat transfer member, It has, The heat transfer member is arranged inside the holding portion. The thermal conductivity of the heat transfer member is greater than that of the holding portion. Light source device.

2. The second direction is a direction that intersects both the longitudinal direction and the first direction. The light source device according to claim 1.

3. The second direction is a direction inclined from the longitudinal direction to the first direction. The light source device according to claim 1.

4. Viewed from the first direction, at least a portion of the heat transfer member overlaps with the light guide member. The light source device according to claim 1.

5. The heat transfer member is columnar or cylindrical, extending in the second direction. A light source device according to any one of claims 1 to 4.

6. The heat transfer member is a cylindrical heat pipe extending in the second direction. A light source device according to any one of claims 1 to 4.

7. The support member has a plurality of heat transfer members, The multiple heat transfer members are arranged along the longitudinal direction. A light source device according to any one of claims 1 to 4.

8. The heat transfer member is a plate-shaped vapor chamber that extends in a direction intersecting the first direction. A light source device according to any one of claims 1 to 4.

9. The plate surface of the heat transfer member faces the first direction, The support surface includes the outer surface of the heat transfer member that faces the first direction. The light source device according to claim 8.

10. The light guide member is further provided with a pressing member that presses it against the support surface. Viewed from the first direction, the portion of the light guide member that is pressed by the pressing member overlaps with the heat transfer member. A light source device according to any one of claims 1 to 4.

11. The pressing members are arranged at intervals from one another in the longitudinal direction, The support member has a plurality of fixing parts that are spaced apart from each other in the longitudinal direction, Each of the multiple pressing members is fixed to a different fixing part, In the longitudinal direction, at least a portion of the heat transfer member is positioned between a plurality of the fixed portions. The light source device according to claim 10.

12. The holding portion comprises a first holding portion having the support surface, and a second holding portion that holds the first holding portion. The heat transfer member is disposed inside the second holding portion. A light source device according to any one of claims 1 to 4.

13. The heat sink is attached to the outer surface of the holding portion that faces away from the support surface. A light source device according to any one of claims 1 to 4.

14. The light-emitting element emits first light having a first wavelength band, The light guide member is a wavelength conversion member that includes a phosphor and converts the first light into a second light having a second wavelength band different from the first wavelength band, and emits the second light. A light source device according to any one of claims 1 to 4.

15. A light source device according to any one of claims 1 to 4, A light modulator that modulates the light emitted from the aforementioned light source device, A projection optical device that projects light modulated by the aforementioned optical modulation device, Equipped with, projector.

Images