Phosphor unit, light source device and projector

Abstract

To provide a phosphor unit, a light source device, and a projector, which can improve the cooling efficiency of a phosphor wheel.SOLUTION: A phosphor unit comprises: a phosphor wheel; a peripheral wall surrounding the phosphor wheel along a circumferential direction around a rotation axis; a heat receiving plate intersecting the rotation axis, facing the phosphor wheel, and spaced apart from the phosphor wheel; and a heat receiving fin fixed to the heat receiving plate and surrounded by the peripheral wall. The phosphor wheel includes: a substrate that has a first surface and a second surface facing the heat receiving plate and rotates around the rotation axis; a wavelength conversion portion disposed on the first surface; and a heat dissipating fin disposed on the second surface, and including a plurality of first fins that generates an airflow in a direction from a center of the second surface toward outside by rotation of the substrate and dissipates heat transferred from the wavelength conversion portion to the airflow. The heat receiving fin includes a plurality of second fins through which an airflow circulating from the phosphor wheel to phosphor wheel via the peripheral wall and the heat receiving plate flows, and that receives heat from the flowing airflow and transfers the heat to the heat receiving plate.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a phosphor unit, a light source device, and a projector. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a projector that modulates light emitted from a light source to form image light and projects the formed image light (see, for example, Patent Document 1). The projector described in Patent Document 1 includes an illumination device, a relay optical system, an image generating section, a projection optical system, and a cabinet. The illumination device includes a plurality of semiconductor lasers that emit blue light, and a phosphor wheel device.

[0003] The phosphor wheel device includes a phosphor wheel that converts excitation light into fluorescent light, and a heat dissipation structure that cools the phosphor wheel. The heat dissipation structure includes a housing that houses a phosphor wheel having phosphors, a heat exchanger having a corrugated plate member, a rotating fin that generates an air flow inside the housing, and a cooling fan. Of these, the rotating fin is rotated together with the phosphor wheel by a wheel motor of the phosphor wheel.

[0004] In such a phosphor wheel device, blue light emitted from a semiconductor laser is sequentially incident on two phosphor regions of a rotating phosphor wheel. One phosphor region is excited by the incident blue light and emits green light, while the other phosphor region is excited by the incident blue light and emits red light. In addition, the rotating fins that rotate together with the phosphor wheel generate airflow in the radial direction, generating an air flow inside the housing. The air heated by the phosphor wheel hits the inner surface of the heat exchanger, and a part of the heat of the phosphor wheel is transferred to the heat exchanger. The cooling fan generates an airflow toward the outer surface of the heat exchanger to cool the heat exchanger. This promotes heat exchange from the inner surface to the outer surface of the plate member of the heat exchanger, cooling the air inside the housing, and ultimately cooling the phosphor wheel. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-22000 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the phosphor wheel device described in Patent Document 1, the plate member is formed in a corrugated shape, so that the air inside the housing heated by the phosphor wheel enters the recesses in the plate member and transfers heat to the inner surface of the plate member. However, because there is no air passage beyond the recess, the air that has entered the recess is likely to remain in the recess even after being cooled. In other words, there is a problem that the air flow in the housing is not circulated efficiently, and the cooling efficiency of the phosphor wheel is low. For this reason, there has been a demand for a configuration that can improve the cooling efficiency of the phosphor wheel. [Means for solving the problem]

[0007] A phosphor unit according to a first aspect of the present disclosure includes a phosphor wheel that rotates around a rotation axis, a peripheral wall that surrounds the phosphor wheel in a circumferential direction around the rotation axis, a heat receiving plate that intersects with the rotation axis on the rotation axis and faces the phosphor wheel and is spaced apart from the phosphor wheel, and a heat receiving fin that is fixed to the heat receiving plate and surrounded by the peripheral wall, wherein the phosphor wheel has a first surface and a second surface that is provided on the opposite side to the first surface and faces the heat receiving plate, and the phosphor unit includes a substrate that rotates around the rotation axis, a front surface that faces the phosphor wheel, and a heat receiving fin that faces the phosphor wheel. The heat receiving fin includes a wavelength conversion unit arranged on the first surface and containing a phosphor that converts the wavelength of incident light, and a heat dissipation fin arranged on the second surface and having a plurality of first fins that generate an airflow from the center of the second surface toward the outside by rotation of the substrate and dissipate heat transferred from the wavelength conversion unit to the generated airflow, and the heat receiving fin has a plurality of second fins through which an airflow circulating from the phosphor wheel via the peripheral wall and the heat receiving plate flows and which receive heat from the circulating airflow and transfers it to the heat receiving plate.

[0008] A phosphor unit according to a second aspect of the present disclosure includes a phosphor wheel that rotates around a rotation axis, a heat receiving plate that is on the rotation axis and intersects with the rotation axis to face the phosphor wheel and is spaced apart from the phosphor wheel, and a heat receiving fin fixed to the heat receiving plate, the phosphor wheel having a first surface and a second surface that is provided on the opposite side to the first surface and faces the heat receiving plate, a substrate that rotates around the rotation axis, a wavelength conversion unit that is disposed on the first surface and contains a phosphor that converts the wavelength of incident light, and a heat receiving fin fixed to the second surface. and a heat dissipation fin having a plurality of first fins arranged on the second surface, which generates an airflow from the center of the second surface toward the outside by the rotation of the substrate, and dissipates heat transferred from the wavelength conversion unit into the generated airflow, the heat receiving fin having a plurality of second fins which transfers the received heat to the heat receiving plate, and a peripheral wall portion located outside the plurality of second fins with respect to the rotation axis, and the airflow flowing from the phosphor wheel circulates to the phosphor wheel via the peripheral wall portion and the plurality of second fins of the heat receiving fin.

[0009] A light source device according to a third aspect of the present disclosure includes a phosphor unit according to the first or second aspect described above, and a solid-state light-emitting element that emits excitation light incident on the phosphor unit, and when the excitation light is incident on the phosphor unit, the phosphor unit emits light containing fluorescence obtained by converting the wavelength of the excitation light.

[0010] A projector according to a fourth aspect of the present disclosure includes the light source device according to the third aspect, a light modulation element that modulates light from the light source device into image light, and a projection optical device that projects the image light. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a projector according to a first embodiment. [Diagram 2] FIG. 1 is a schematic diagram showing a light source device according to a first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing a peripheral wall according to the first embodiment. [Figure 4] FIG. 2 is a diagram showing a phosphor wheel according to the first embodiment. [Diagram 5] FIG. 1 is a cross-sectional view showing a wavelength conversion device according to a first embodiment. [Figure 6] FIG. 2 is a perspective view showing a heat receiving fin according to the first embodiment. [Figure 7] FIG. 2 is a plan view showing a heat receiving fin according to the first embodiment. [Figure 8] 1 is a cross-sectional view showing a heat dissipation device according to a first embodiment. [Figure 9] FIG. 2 is a perspective view showing the light source device according to the first embodiment with a cover member removed. [Figure 10] FIG. 2 is a cross-sectional view showing the phosphor unit according to the first embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a phosphor unit provided in a projector according to a second embodiment. [Figure 12] FIG. 11 is a perspective view showing a heat receiving fin according to a second embodiment. [Figure 13] FIG. 11 is a plan view showing a heat receiving fin according to a second embodiment. [Figure 14] FIG. 11 is a cross-sectional view showing a wavelength conversion device according to a second embodiment. [Figure 15] FIG. 11 is a cross-sectional view showing a heat dissipation fin and a peripheral wall side fin according to a second embodiment. [Figure 16] 10 is a graph showing the relationship between the crossing angle γ and the flow speed of the air current that passes through a plurality of peripheral-wall side fins and flows through the heat-receiving fins toward the peripheral wall according to the second embodiment. [Figure 17] 13 is a graph showing the relationship between the crossing angle γ and the surface temperature of the wavelength converting portion according to the second embodiment. [Figure 18] FIG. 11 is a plan view showing a heat receiving fin of a phosphor unit according to a modification of the second embodiment. [Figure 19] FIG. 11 is a plan view showing a heat receiving fin of a phosphor unit provided in a projector according to a third embodiment. [Figure 20] FIG. 11 is a cross-sectional view showing a heat receiving fin according to a third embodiment. [Figure 21] FIG. 13 is a cross-sectional view showing a phosphor unit provided in a projector according to a fourth embodiment. [Figure 22] FIG. 13 is a perspective view showing a phosphor unit provided in a projector according to a fifth embodiment. [Diagram 23] FIG. 13 is a cross-sectional view showing a phosphor unit according to a fifth embodiment. [Figure 24] FIG. 11 is a perspective view showing a heat dissipation device according to a modification of each embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [First embodiment] Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. [Projector configuration] FIG. 1 is a schematic diagram showing the configuration of a projector 1 according to the present embodiment. A projector 1 according to this embodiment projects image light according to image information. As shown in Fig. 1, the projector 1 includes an exterior housing 11 and an image projection device 2 housed in the exterior housing 11. In addition, although not shown, the projector 1 includes a control device that controls the operation of the projector 1, a power supply device that supplies power to electronic components of the projector 1, and a cooling device that cools a cooling target of the projector 1.

[0013] [Configuration of image projection device] The image projection device 2 forms image light according to input image information and projects the formed image light. The image projection device 2 includes a light source device 3, a homogenization optical system 21, a color separation optical system 22, a relay optical system 23, an image forming device 24, an optical component housing 25, and a projection optical device 26.

[0014] The light source device 3 emits illumination light to the homogenizing optical system 21. The configuration of the light source device 3 will be described in detail later. The homogenizing optical system 21 homogenizes the illumination light emitted from the light source device 3. The homogenized illumination light passes through a color separation optical system 22 and a relay optical system 23, and illuminates a modulation area of ​​a light modulation element 243 (described later). The homogenizing optical system 21 includes two lens arrays 211 and 212, a polarization conversion element 213, and a superimposing lens 214. The color separation optical system 22 separates the illumination light incident from the homogenization optical system 21 into red, green, and blue color lights. The color separation optical system 22 includes two dichroic mirrors 221 and 222, and a reflecting mirror 223 that reflects the blue light separated by the dichroic mirror 221.

[0015] The relay optical system 23 is provided on the optical path of the red light which is longer than the optical paths of the other colored lights, and suppresses loss of the red light. The relay optical system 23 includes an incident side lens 231, a relay lens 233, and reflecting mirrors 232 and 234. In this embodiment, the red light is guided to the relay optical system 23. However, the present invention is not limited to this, and for example, the colored light having a longer optical path than the other colored lights may be blue light, and the blue light may be guided to the relay optical system 23.

[0016] The image forming device 24 modulates the incident red, green, and blue color lights and combines the modulated color lights to form image light. The image forming device 24 has three field lenses 241, three incident-side polarizing plates 242, three light modulation elements 243, three exit-side polarizing plates 244, and one color combining optical system 245, which are provided according to the incident color lights.

[0017] The light modulation elements 243 modulate the light from the light source device 3 into image light. Specifically, the light modulation elements 243 modulate the color light incident from the incident-side polarizing plate 242 in accordance with an image signal, and emit the modulated color light. The three light modulation elements 243 include a light modulation element 243R that modulates red light, a light modulation element 243G that modulates green light, and a light modulation element 243B that modulates blue light. An example of the light modulation elements 243 is a transmissive liquid crystal panel.

[0018] The color synthesis optical system 245 synthesizes the three color lights modulated by the light modulation elements 243R, 243G, and 243B. The image light synthesized by the color synthesis optical system 245 is incident on the projection optical device 26. In this embodiment, the color synthesis optical system 245 is configured by a substantially rectangular parallelepiped cross dichroic prism, but may be configured by a plurality of dichroic mirrors.

[0019] The optical component housing 25 accommodates therein the homogenizing optical system 21, the color separation optical system 22, the relay optical system 23, and the image forming device 24. Note that the image projection device 2 is designed to have an optical axis Ax1, and the optical component housing 25 holds the homogenizing optical system 21, the color separation optical system 22, the relay optical system 23, and the image forming device 24 at predetermined positions on the optical axis Ax1. The light source device 3 and the projection optical device 26 are disposed at predetermined positions on the optical axis Ax1. The projection optical device 26 projects the image light incident from the image forming device 24 onto a projection surface such as a screen. The projection optical device 26 can be, for example, a lens assembly including a plurality of lenses (not shown) and a lens barrel 261 that houses the plurality of lenses.

[0020] [Light source configuration] FIG. 2 is a schematic diagram showing the light source device 3. As shown in FIG. The light source device 3 emits illumination light that illuminates the image forming device 24 to the homogenizing optical system 21. As shown in Fig. 2, the light source device 3 includes a light source housing 31, a light source 32, an afocal optical element 33, a first phase difference element 34, a diffuse transmission element 35, a light separation / combination element 36, a second phase difference element 37, a first light collecting element 38, a diffusion optical element 39, a second light collecting element 40, a third phase difference element 41, and a wavelength conversion device 5A. The light source housing 31 will be described in detail later.

[0021] The light source device 3 is provided with an optical axis Ax2 extending linearly and an optical axis Ax3 extending linearly and perpendicular to the optical axis Ax2. The optical axis Ax3 overlaps with the optical axis Ax1 in the homogenizing optical system 21. The light source 32, the afocal optical element 33, the first phase difference element 34, the diffuse transmission element 35, the light separation / combination element 36, the second phase difference element 37, the first light collecting element 38 and the diffusion optical element 39 are arranged on the optical axis Ax2. The wavelength converter 5A, the second light collecting element 40, the light separating / combining element 36, and the third phase difference element 41 are disposed on the optical axis Ax3. In the following description, the three mutually orthogonal directions are defined as the +X direction, the +Y direction, and the +Z direction. In this embodiment, the +X direction is defined as the direction in which the light source 32 emits light along the optical axis Ax2, and the +Z direction is defined as the direction in which the light source device 3 emits illumination light along the optical axis Ax3. Although not shown in the drawings, the direction opposite to the +X direction is defined as the -X direction, the direction opposite to the +Y direction is defined as the -Y direction, and the direction opposite to the +Z direction is defined as the -Z direction.

[0022] [Light source configuration] The light source 32 includes at least one solid-state light-emitting element 321, which emits light incident on the diffusion optical element 39 and the wavelength conversion device 5A in the +X direction. The solid-state light-emitting element 321 emits blue light, which is excitation light. For example, the solid-state light-emitting element 321 is an LD (Laser Diode) that emits laser light with a peak wavelength of 440 nm. The light emitted by the light source 32 is s-polarized blue light BLs for the light separating / combining element 36. However, the light is not limited to this, and may be p-polarized blue light BLp for the light separating / combining element 36, or may be a mixture of s-polarized and p-polarized blue light. In the latter case, the first phase difference element 34 can be omitted.

[0023] [Configuration of afocal optical elements] The afocal optical element 33 adjusts the beam diameter of the blue light BLs incident in the +X direction from the light source 32. The afocal optical element 33 is composed of a lens 331 that collects the incident light, and a lens 332 that collimates the beam collected by the lens 331. Note that the afocal optical element 33 may not be provided.

[0024] [Configuration of the first phase difference element] The first phase difference element 34 is provided between the lens 331 and the lens 332. The first phase difference element 34 converts a part of the incident blue light BLs into blue light BLp, and emits light including s-polarized blue light BLs and p-polarized blue light BLp. The first phase difference element 34 may be rotated by a rotation device about a rotation axis along the optical axis Ax2. In this case, the ratio of s-polarized components and p-polarized components in the blue light emitted from the first phase difference element 34 can be adjusted according to the rotation angle of the first phase difference element 34.

[0025] [Configuration of diffuse transmission element] The diffuse transmission element 35 homogenizes the illuminance distribution of the blue light BLp, BLs incident in the -Z direction from the lens 332. The blue light BLs, BLp that passes through the diffuse transmission element 35 is incident on the light separation / combination element 36. Examples of the diffuse transmission element 35 include a configuration having a hologram, a configuration in which a plurality of small lenses are arranged on a plane perpendicular to the optical axis, and a configuration in which the surface through which light passes is rough. Instead of the diffuse transmission element 35, a homogenizer optical element having a pair of multi-lenses may be used.

[0026] [Configuration of the light splitting / combining element] The light separating / combining element 36 functions as a light separating element that separates incident light, and also functions as a light combining element that combines light incident from two directions. The light separation / combining element 36 is a polarizing beam splitter, and separates the s-polarized component and the p-polarized component contained in the incident light. Specifically, the light separation / combining element 36 reflects the s-polarized component and transmits the p-polarized component. The light separation / combining element 36 also has a color separation characteristic that transmits light of a predetermined wavelength or more, regardless of whether the polarized component is the s-polarized component or the p-polarized component. Therefore, of the blue light BLp, BLs incident on the light separation / combining element 36 from the diffuse transmission element 35, the p-polarized blue light BLp transmits through the light separation / combining element 36 in the +X direction and enters the second phase difference element 37. On the other hand, the s-polarized blue light BLs is reflected by the light separation / combining element 36 in the -Z direction and enters the second light collecting element 40. The light separation / synthesis element 36 may have a function of a half mirror that transmits a part of the light incident from the light source 32 via the diffuse transmission element 35 and reflects the remaining light, and a function of a dichroic mirror that reflects the blue light incident from the diffusion optical element 39 and transmits the fluorescence that is incident from the wavelength conversion device 5A and has a wavelength longer than that of the blue light. In this case, the first phase difference element 34 can be omitted.

[0027] [Configuration of the second phase difference element] The second phase difference element 37 is disposed in the +X direction with respect to the light separation / synthesis element 36. That is, the second phase difference element 37 is disposed between the light separation / synthesis element 36 and the first light collecting element 38. The second phase difference element 37 converts the blue light BLp having passed through the light separation / synthesis element 36 in the +X direction into circularly polarized blue light BLc. The blue light BLc having passed through the second phase difference element 37 in the +X direction is incident on the first light collecting element 38.

[0028] [Configuration of the first light-collecting element] The first light collecting element 38 collects the blue light BLc, which has passed through the light separation / synthesis element 36 in the +X direction and is incident from the second phase difference element 37, onto the diffusing optical element 39. The first light collecting element 38 also collimates the light incident from the diffusing optical element 39 in the -X direction and outputs the collimated light to the second phase difference element 37. In this embodiment, the first light collecting element 38 is composed of three lenses 381, 382, ​​and 383, but the number of lenses constituting the first light collecting element 38 is not limited.

[0029] [Configuration of diffusive optical element] The diffusing optical element 39 diffuses the incident blue light BLc at the same diffusion angle as the fluorescence YL emitted from the wavelength conversion device 5A. Specifically, the diffusing optical element 39 reflects the blue light BLc incident in the +X direction from the first light collecting element 38 in the -X direction to diffuse it. The diffusing optical element 39 is a reflecting element that performs Lambertian reflection on the incident blue light BLc. The diffusing optical element 39 may be rotated around a rotation axis parallel to the optical axis Ax2 by a rotating device. The blue light BLc diffused by the diffusing optical element 39 passes through the first concentrating element 38 and then enters the second phase difference element 37. When the blue light BLc incident on the diffusing optical element 39 is reflected by the diffusing optical element 39, it is converted into circularly polarized light with the opposite rotation direction. Therefore, the blue light BLc incident on the second phase difference element 37 via the first concentrating element 38 is converted into s-polarized blue light BLs by the second phase difference element 37. Then, the blue light BLs is reflected in the +Z direction by the light separating / combining element 36 and enters the third phase difference element 41.

[0030] [Configuration of the second light-collecting element] The second light collecting element 40 collects the blue light BLs reflected in the -Z direction by the light separating / combining element 36 onto a wavelength converting section 53 (described later) of a phosphor wheel 51 included in the wavelength conversion device 5A. The second light collecting element 40 also collimates the fluorescence YL incident in the +Z direction from the wavelength converting section 53, and emits the collimated fluorescence YL to the light separating / combining element 36. In this embodiment, the second light collecting element 40 is composed of three lenses 401, 402, and 403, but the number of lenses constituting the second light collecting element 40 is not limited.

[0031] [Outline of wavelength conversion device] The wavelength conversion device 5A constitutes a phosphor unit PS1 together with a peripheral wall 311 (described later) of the light source housing 31. That is, the light source device 3 includes the phosphor unit PS1. The wavelength converter 5A includes a phosphor wheel 51 that converts the wavelength of the blue light BLs incident from the second light collecting element 40 and emits the fluorescence YL. The phosphor wheel 51 is a so-called reflective wavelength conversion element, and emits the fluorescence YL in the opposite direction to the incident direction of the blue light BLs, which is the excitation light. The configuration of the wavelength converter 5A will be described in detail later.

[0032] The fluorescence YL emitted in the +Z direction from the wavelength conversion device 5A is collimated by the second light collecting element 40 and then enters the light separating / synthesizing element 36. As described above, since the light separating / synthesizing element 36 has the property of transmitting the fluorescence YL, the fluorescence YL that enters the light separating / synthesizing element 36 along the +Z direction passes through the light separating / synthesizing element 36 and enters the third phase difference element 41. In other words, the light that enters the third phase difference element 41 from the light separating / synthesizing element 36 is white light that is a mixture of blue light BLs and fluorescence YL.

[0033] [Configuration of the third phase difference element] The third phase difference element 41 converts the white light including the blue light BLs and the fluorescence YL incident from the light separation / combination element 36 into white light including a mixture of s-polarized light and p-polarized light. The white light thus converted is emitted in the +Z direction as the illumination light LT and enters the homogenization optical system 21 described above.

[0034] [Light source housing configuration] The light source housing 31 accommodates the light source 32, the afocal optical element 33, the first phase difference element 34, the diffuse transmission element 35, the light separation / combination element 36, the second phase difference element 37, the first light collecting element 38, the diffusive optical element 39, the second light collecting element 40, the third phase difference element 41, and a part of the wavelength conversion device 5 A. The light source housing 31 is a sealed housing into which dust and the like are unlikely to enter.

[0035] [Configuration of the perimeter wall] Fig. 3 is a cross-sectional view showing the light source casing 31 at the arrangement position of the wavelength converter 5A. That is, Fig. 3 is a diagram showing a cross section of the peripheral wall 311 along the XY plane. As shown in Figures 2 and 3, the light source housing 31 is arranged around the phosphor wheel 51 of the wavelength conversion device 5A and has a peripheral wall 311 that surrounds the phosphor wheel 51 in the circumferential direction centered on the rotation axis Rx of the phosphor wheel 51. The peripheral wall 311 constitutes a part of the phosphor unit PS1. As shown in Fig. 3, the inner edge of the peripheral wall 311 is formed in a circular shape matching the shape of the phosphor wheel 51 when viewed from the incident side of the blue light BLs. As will be described in detail later, when the phosphor wheel 51 rotates, an air flow is generated that flows from the region on the rotation axis Rx side of the phosphor wheel 51 toward the outside of the phosphor wheel 51. The peripheral wall 311 turns back the air flow that has flowed to the outside of the phosphor wheel 51, and causes it to flow to the heat receiving plate 57 and the heat receiving fins 58, which will be described later. Such peripheral wall 311 is made of a metal with high thermal conductivity, and receives heat from the airflow that contacts peripheral wall 311 and releases the received heat from the outer surface of peripheral wall 311.

[0036] [Configuration of wavelength conversion device] The wavelength converter 5A includes a phosphor wheel 51 as shown in FIGS. 2 and 3, and also includes a rotation device 56 as shown in FIG. The rotation device 56 is configured by, for example, a motor, and rotates the substrate 52 of the phosphor wheel 51. The rotation device 56 is disposed in the center of the phosphor wheel 51.

[0037] [Phosphor wheel configuration] The phosphor wheel 51 is rotated about a rotation axis Rx along the optical axis Ax3 by a rotation device 56. As shown in Fig. 2 and Fig. 3, the phosphor wheel 51 includes a substrate 52, a wavelength conversion section 53, and a reflection section 54, as well as heat dissipation fins 55 shown in Fig. 2.

[0038] [Board configuration] 3, the substrate 52 is, for example, a plate-like body formed into a disk shape, and is rotated about a rotation axis Rx by a rotation device 56. The substrate 52 functions as a support for supporting the wavelength conversion unit 53, the reflecting unit 54, and the heat dissipation fins 55, and also functions as a heat transfer body for transferring heat generated in the wavelength conversion unit 53 to the heat dissipation fins 55. The substrate 52 has a first surface 521 facing the +Z direction, and a second surface 522 provided on the opposite side to the first surface 521. The second surface 522 faces a heat receiving plate 57 described later.

[0039] [Configuration of wavelength conversion section and reflector section] 2 and 3, the wavelength conversion unit 53 is disposed on the first surface 521. The wavelength conversion unit 53 contains a phosphor that converts the wavelength of the excitation light incident from the second light collecting element 40. That is, the wavelength conversion unit 53 is excited by the blue light BLs, which is the excitation light, and emits unpolarized fluorescence YL having a wavelength longer than the wavelength of the blue light BLs. The fluorescence YL is light that contains green light and red light, and further contains s-polarized components and p-polarized components with respect to the light separating / combining element 36. 3, the wavelength conversion unit 53 is formed in a ring shape centered on the rotation axis Rx, and the incident position of the blue light BLs on the wavelength conversion unit 53 moves as the substrate 52 rotates. This prevents the blue light BLs from continuing to be locally incident on the wavelength conversion unit 53, and prevents the temperature of the wavelength conversion unit 53 from increasing locally. The wavelength conversion unit 53 generates heat due to the incidence of the blue light BLs. Some of the heat generated in the wavelength conversion unit 53 is directly dissipated from the wavelength conversion unit 53, and the other heat is transferred to the substrate 52 via the reflecting unit 54 and dissipated. The reflecting section 54 is provided between the wavelength converting section 53 and the first surface 521, and reflects the light incident from the wavelength converting section 53 in the +Z direction. Note that, if the first surface 521 can be used as a reflective surface, the reflecting section 54 may not be provided.

[0040] [Heat dissipation fin configuration] 2, the heat dissipation fins 55 are disposed on the second surface 522 and rotate together with the substrate 52. Heat from the wavelength conversion unit 53 is transferred to the heat dissipation fins 55 via the substrate 52. When the substrate 52 rotates, the heat dissipation fins 55 generate an airflow that flows from the center of the second surface 522 toward the outside as viewed from the -Z direction. The heat dissipation fins 55 dissipate the heat transferred from the wavelength conversion unit 53 to the generated airflow.

[0041] Fig. 4 is a diagram showing phosphor wheel 51 as viewed from the opposite side to the incident side of blue light BLs. That is, Fig. 4 is a diagram showing heat dissipation fins 55 as viewed from the -Z direction. In Fig. 4, of the multiple first fins 551 constituting heat dissipation fin 55, only some of the first fins 551 are labeled with reference numerals. As shown in FIG. 4, the heat dissipation fin 55 has a plurality of first fins 551. Each of the multiple first fins 551 extends from the end on the rotation axis Rx side toward the outside of the phosphor wheel 51, and is arranged along the circumferential direction centered on the rotation axis Rx. In detail, each of the multiple first fins 551 is curved in the opposite direction to the R1 direction, which is the rotation direction of the phosphor wheel 51, as it approaches the outside of the phosphor wheel 51. When the substrate 52 provided with such heat dissipation fins 55 rotates in the R1 direction, an air current that flows from the center side of the second surface 522 toward the outside of the substrate 52 is generated.

[0042] [Other configurations of wavelength conversion device] FIG. 5 is a diagram showing a cross section of the wavelength converter 5A along the YZ plane. 5, the wavelength converter 5A includes a heat receiving plate 57, a heat receiving fin 58, a thermoelectric conversion element 59, and a heat dissipation device 60, in addition to the phosphor wheel 51 and the rotation device 56 described above. That is, the phosphor unit PS1 includes a peripheral wall 311, the phosphor wheel 51, the rotation device 56, the heat receiving plate 57, the heat receiving fin 58, the thermoelectric conversion element 59, and the heat dissipation device 60, as shown in FIGS.

[0043] [Heat receiving plate configuration] The heat receiving plate 57 is fixed to the light source housing 31 and seals the light source housing 31. The heat receiving plate 57 is disposed on the rotation axis Rx, intersecting the rotation axis Rx, facing the phosphor wheel 51, and spaced apart from the phosphor wheel 51. The heat receiving plate 57 receives heat from the airflow that flows along the heat dissipation fins 55 of the rotating phosphor wheel 51 and carries heat. In detail, the heat receiving plate 57 receives heat directly from the airflow, and also receives heat transferred from the heat receiving fins 58. The heat receiving plate 57 has a heat receiving surface 571 facing the phosphor wheel 51, a heat dissipation surface 572 on the opposite side to the heat receiving surface 571, and an arrangement portion 573.

[0044] The heat receiving surface 571 faces the +Z direction and faces the second surface 522 of the phosphor wheel 51. On the heat receiving surface 571, a heat receiving fin 58 is provided. The heat dissipation surface 572 faces the -Z direction. The thermoelectric conversion element 59 is connected to the heat dissipation surface 572. The arrangement portion 573 is a portion that protrudes from the center of the heat receiving surface 571 toward the phosphor wheel 51 side beyond the heat receiving surface 571. The rotation device 56 is arranged on the arrangement portion 573. That is, the heat receiving plate 57 intersects with the rotation axis Rx on the rotation axis Rx. In this embodiment, the heat receiving plate 57 is configured by a vapor chamber, and the heat transferred to the heat receiving surface 571 is diffused inside the heat receiving plate 57 and transferred to the heat dissipation surface 572. This allows the heat received by the heat receiving surface 571 to be efficiently transported to the heat dissipation surface 572. However, the present invention is not limited to this, and the heat receiving plate 57 may be a metal plate such as copper.

[0045] [Heat receiving fin configuration] Fig. 6 is a perspective view of the heat receiving fins 58 as viewed from the +Z direction. Fig. 7 is a plan view of the heat receiving fins 58 as viewed from the +Z direction. 6 and 7, the heat receiving fin 58 has an inner peripheral edge and an outer peripheral edge each formed in a substantially circular shape centered on the rotation axis Rx when viewed from the phosphor wheel 51 side. That is, the heat receiving fin 58 is formed in a ring shape centered on the rotation axis Rx so as to avoid the arrangement portion 573. As shown in Fig. 3, the outer diameter of the heat receiving fin 58 centered on the rotation axis Rx is larger than the outer diameter of the phosphor wheel 51 centered on the rotation axis Rx. The center of the heat receiving fin 58 when viewed from the +Z direction intersects with the rotation axis Rx that passes through the center of the second surface 522 of the phosphor wheel 51.

[0046] 5, the heat receiving fin 58 has a plurality of second fins 581 provided between the heat receiving surface 571 of the heat receiving plate 57 and the heat dissipation fin 55 in the direction along the rotation axis Rx. In this embodiment, the plurality of second fins 581 correspond to a plurality of heat receiving plate side fins. 6 and 7, the multiple second fins 581 are arranged in the circumferential direction centered on the rotation axis Rx. Each of the multiple second fins 581 is fixed in contact with the heat-receiving surface 571 and stands up from the heat-receiving surface 571. That is, each of the multiple second fins 581 is connected to the heat-receiving surface 571 so as to be capable of transferring heat. Each of the multiple second fins 581 extends from the portion on the rotation axis Rx side toward the peripheral wall 311. More specifically, each of the multiple second fins 581 extends linearly so as to be inclined clockwise toward the outer circumferential edge of the heat receiving fin 58 when viewed from the +Z direction.

[0047] Between the fins of the second fins 581, there is formed a gap through which airflow can flow. Therefore, the airflow that flows to the outside of the phosphor wheel 51 and is turned back by the peripheral wall 311 as the phosphor wheel 51 rotates flows through the second fins 581 and flows toward the rotation axis Rx along the second fins 581. That is, between the fins of the second fins 581, airflow that circulates from the phosphor wheel 51 to the phosphor wheel 51 via the peripheral wall 311 and the heat receiving plate 57 flows. The second fins 581 receive heat from the airflow flowing between the fins and transfer the received heat to the heat receiving plate 57. As a result, the airflow flowing through the central portion where the second surface 522 of the phosphor wheel 51 is negative pressure is cooled.

[0048] [Structure of thermoelectric conversion element] The thermoelectric conversion element 59 shown in FIG. 5 is disposed between the heat receiving plate 57 and the heat dissipation device 60 , and transports the heat transferred from the heat receiving plate 57 to the heat dissipation device 60 . The thermoelectric conversion element 59 has a first surface 591 connected to the heat dissipation surface 572 of the heat receiving plate 57, and a second surface 592 connected to the heat sink 601 of the heat dissipation device 60. The first surface 591 and the second surface 592 are surfaces of the thermoelectric conversion element 59 that are opposite to each other. In this embodiment, the thermoelectric conversion element 59 is configured by a Peltier element. In the thermoelectric conversion element 59 which is a Peltier element, the first surface 591 functions as a heat absorption surface, and the second surface 592 functions as a heat dissipation surface. The thermoelectric conversion element 59 actively absorbs heat from the heat receiving plate 57 at the first surface 591, and dissipates the heat to the heat dissipation device 60 via the second surface 592. If heat transfer from the heat receiving plate 57 to the heat dissipation device 60 is good, the thermoelectric conversion element 59 is not necessary. In this case, the heat dissipation device 60 is connected to the heat dissipation surface 572 of the heat receiving plate 57 so as to be capable of transferring heat.

[0049] [Heat dissipation device configuration] FIG. 8 is a diagram showing a cross section of the heat dissipation device 60 along the XZ plane. The heat dissipation device 60 is provided on the opposite side of the heat receiving plate 57 to the phosphor wheel 51. The heat dissipation device 60 dissipates heat transferred from the heat receiving plate 57 via the thermoelectric conversion element 59 to the outside of the light source housing 31. As shown in FIG. 8, the heat dissipation device 60 includes a heat sink 601, a duct 602, and a cooling fan 603.

[0050] [Heat sink configuration] Fig. 9 is a perspective view showing the light source device 3 in a state where a cover member 6023 constituting the duct 602 is removed. In Fig. 9, only some of the fins 6011 out of the multiple fins 6011 are labeled with reference numerals. 5 and 8, the heat sink 601 is connected to the second surface 592 of the thermoelectric conversion element 59 in a heat transferable manner, and is provided inside the duct 602 as shown in Fig. 8 and 9. The heat sink 601 transfers the heat transferred from the heat receiving plate 57 via the thermoelectric conversion element 59 to the cooling gas flowing inside the duct 602.

[0051] The heat sink 601 has a plurality of fins 6011 extending in the flow direction of the cooling gas flowing through the duct 602. Specifically, as shown in Fig. 9, each of the plurality of fins 6011 extends along the +X direction and is arranged side by side in the +Y direction. The cooling gas flowing through the duct 602 is caused to flow through each fin 6011 by the cooling fan 603, and each fin 6011 transfers the transferred heat of the phosphor wheel 51 to the cooling gas. A recess 6012 provided in the center of the heat sink 601 is a portion for accommodating a screw (not shown) for fixing the rotating device 56 to the heat receiving plate 57 .

[0052] Duct Configuration 8, the duct 602 accommodates a cooling fan 603 and a heat sink 601, and allows a cooling gas circulated by the cooling fan 603 to flow through the heat sink 601. The duct 602 has a duct body 6021 and a cover member 6023. The duct body 6021 is connected to the heat receiving plate 57. The duct body 6021 has an opening 6022 that opens in the -Z direction. The duct body 6021 is made of a material with good thermal conductivity, and the duct body 6021 dissipates a part of the heat transferred from the heat receiving plate 57. The cover member 6023 is a plate-like body that is attached to the duct body 6021 and closes the opening 6022. An inlet 6024 that introduces gas outside the duct 602 into the duct 602 is provided in a portion of the cover member 6023 in the -X direction. Such a duct 602 has an outlet 6025 at the end in the +X direction, which is formed by combining a duct body 6021 and a cover member 6023 .

[0053] [Cooling fan configuration] 8 and 9, the cooling fan 603 is disposed in the duct 602, sucks in gas outside the duct 602 through the inlet 6024 shown in Fig. 8, and sends it out as cooling gas into the duct 602. The cooling gas sent out from the cooling fan 603 in the +X direction flows between the fins of the multiple fins 6011, and is then discharged to the outside of the duct 602 through the outlet 6025. The cooling fan 603 may be disposed on the downstream side instead of the upstream side of the flow path of the cooling gas flowing through the heat sink 601.

[0054] [Air flow and heat transport in phosphor unit] FIG. 10 is a diagram showing a cross section of the phosphor unit PS1 as viewed from the -Z direction, illustrating the flow direction of air currents in the phosphor unit PS1 and the transfer direction of heat generated in the phosphor wheel 51. As shown in FIG. 10, an air current flows toward the outside of the phosphor wheel 51 due to the heat dissipation fins 55. The heat dissipation fins 55 transfer heat transferred from the wavelength conversion unit 53 via the substrate 52 to the air current flowing between the fins of the multiple first fins 551. Therefore, the air current flowing out from the heat dissipation fins 55 to the outside of the phosphor wheel 51 picks up heat from the heat dissipation fins 55. The airflow discharged to the outside of the phosphor wheel 51 is turned back by the inner surface of the peripheral wall 311 as shown by the arrow A2, and flows to the heat receiving plate 57 facing the second surface 522. Since the heat receiving plate 57 is provided with the heat receiving fins 58, the airflow turned back by the peripheral wall 311 flows between the fins of the plurality of second fins 581 constituting the heat receiving fins 58 toward the rotation axis Rx as shown by the arrow A3. The airflow flowing in this manner is cooled by receiving heat from the plurality of second fins 581. The airflow flowing toward the rotation axis Rx is sucked in again by the rotating phosphor wheel 51, and flows out to the outside of the phosphor wheel 51 through the heat dissipation fins 55 as shown by the arrow A1.

[0055] On the other hand, the heat received by the heat receiving fins 58 is transferred from the heat receiving fins 58 to the heat receiving plate 57 as shown by the arrow B1, and then transferred to the heat sink 601 of the heat dissipation device 60 via the thermoelectric conversion element 59. As indicated by arrow C1, cooling gas is circulated through the heat sink 601 by the cooling fan 603. The cooling gas to which heat has been transferred by the heat sink 601 is exhausted to the outside of the duct 602 through the exhaust port 6025, and further to the outside of the light source housing 31. As a result, heat generated in the wavelength conversion section 53 of the phosphor wheel 51 is discharged to the outside of the light source casing 31, and the temperature inside the light source casing 31, and therefore the temperature of the wavelength conversion section 53, are kept low.

[0056] [Effects of the first embodiment] The projector 1 according to the present embodiment described above provides the following advantages. The projector 1 includes a light source device 3, a light modulation element 243 that modulates the light from the light source device 3 into image light, and a projection optical device 26 that projects the image light. The light source device 3 includes a phosphor unit PS1 and a solid-state light emitting element 321 that emits blue light BLs that is excitation light incident on the phosphor unit PS1. When the blue light BLs is incident on the phosphor unit PS1, the phosphor unit PS1 emits light that contains fluorescence YL obtained by converting the wavelength of the blue light BLs.

[0057] The phosphor unit PS1 includes a phosphor wheel 51, a peripheral wall 311, a heat receiving plate 57, and a heat receiving fin 58. The phosphor wheel 51 rotates about a rotation axis Rx. The phosphor wheel 51 includes a substrate 52, a wavelength conversion portion 53, and heat dissipation fins 55. The substrate 52 has a first surface 521 and a second surface 522 that is provided on the opposite side to the first surface 521 and faces the heat receiving plate 57. The substrate 52 rotates about a rotation axis Rx. Wavelength converting portion 53 is disposed on first surface 521 and contains a phosphor that converts the wavelength of incident light. Heat dissipation fins 55 are disposed on second surface 522. Heat dissipation fins 55 have a plurality of first fins 551 that generate an airflow from the center of second surface 522 toward the outside by the rotation of substrate 52 and dissipate heat transferred from wavelength conversion unit 53 to the generated airflow.

[0058] The peripheral wall 311 surrounds the phosphor wheel 51 in the circumferential direction centered on the rotation axis Rx. The heat receiving plate 57 is disposed on the rotation axis Rx, intersecting the rotation axis Rx, facing the phosphor wheel 51, and spaced apart from the phosphor wheel 51. The heat-receiving fins 58 are fixed to the heat-receiving plate 57 and surrounded by the peripheral wall 311. The heat-receiving fins 58 have a plurality of second fins 581. The airflow circulating from the phosphor wheel 51 to the phosphor wheel 51 via the peripheral wall 311 and the heat receiving plate 57 flows through the multiple second fins 581. The multiple second fins 581 receive heat from the circulating airflow and transfer the heat to the heat receiving plate 57.

[0059] According to this configuration, the phosphor contained in wavelength conversion unit 53 generates heat when converting the wavelength of incident light. A part of the heat generated by the phosphor is transferred to substrate 52, and a part of the heat transferred to substrate 52 is transferred to heat dissipation fins 55 via substrate 52. When substrate 52 rotates, the gas around first surface 521 of substrate 52 flows through wavelength converting section 53 , thereby cooling wavelength converting section 53 . Furthermore, when the substrate 52 rotates, the heat dissipation fins 55 provided on the second surface 522 generate an airflow in a direction from the center of the second surface 522 toward the outside. The generated airflow flows between the fins of the multiple first fins 551, and the heat transferred from the wavelength conversion unit 53 to the multiple first fins 551 via the substrate 52 is transferred to the airflow. This causes the wavelength conversion unit 53 to be further cooled.

[0060] The airflow that has passed through the heat dissipation fin 55 is turned back by the peripheral wall 311 arranged around the phosphor wheel 51, and flows toward the center of the second surface 522, which is negatively pressurized by the rotation of the substrate 52. That is, the airflow that has passed outside the phosphor wheel 51 circulates to the center of the second surface 522 via the peripheral wall 311 and the heat receiving plate 57. The circulating airflow passes between the fins of the multiple second fins 581 of the heat receiving fin 58 fixed to the heat receiving plate 57, and the multiple second fins 581 receive heat from the airflow. The heat received by the multiple second fins 581 is transferred to the heat receiving plate 57, and the heat receiving plate 57 also receives heat from the airflow. As a result, the airflow toward the center of the second surface 522 is cooled. Then, the cooled airflow passes through the heat dissipation fin 55 again in the process of passing from the central region of the second surface 522 to the outside. In this way, the temperature of the airflow passing through the heat dissipation fins 55 can be kept low by the heat receiving fins 58 fixed to the heat receiving plate 57, thereby improving the cooling efficiency of the wavelength conversion unit 53. In addition, the airflow passes through the space surrounded by the phosphor wheel 51, the peripheral wall 311, and the heat receiving plate 57, and cools the heat dissipation fins 55. This allows the cooling structure of the wavelength conversion unit 53 to be configured compactly. In addition, since the cooling effect of the wavelength conversion unit 53 is high, it is possible to increase the amount of excitation light incident on the wavelength conversion unit 53. Therefore, it is possible to configure a light source device 3 with a large amount of emitted light, and also to configure a projector 1 capable of projecting image light with high brightness.

[0061] In the phosphor unit PS1, each of the multiple second fins 581 stands up from the heat receiving plate 57. Each of the multiple second fins 581 extends from a portion on the rotation axis Rx side toward the peripheral wall 311. In other words, each of the multiple second fins 581 extends from the outer circumferential edge of the heat receiving fin 58 toward the rotation axis Rx. According to this configuration, the multiple second fins 581 can be arranged along the flow direction of the airflow circulating in the space surrounded by the phosphor wheel 51, the peripheral wall 311, and the heat receiving plate 57. This makes it easier for the airflow to flow between the multiple second fins 581, and makes it easier for each second fin 581 to receive heat from the airflow. Therefore, the efficiency of heat transfer from the airflow to the heat receiving fins 58 can be improved.

[0062] In the phosphor unit PS1, the multiple second fins 581 correspond to multiple heat receiving plate side fins arranged between the heat receiving plate 57 and the heat dissipation fin 55 in the direction along the rotation axis Rx. The airflow that flows from the heat dissipation fin 55 to the outside of the phosphor wheel 51 flows through the multiple second fins 581 after being turned back by the peripheral wall 311, and the multiple second fins 581 cause the airflow turned back by the peripheral wall 311 to flow toward the rotation axis Rx side. According to this configuration, the multiple second fins 581 can receive heat from the airflow that flows outward from the heat dissipation fins 55 and turns back at the peripheral wall 311. Therefore, while circulating the airflow, the heat of the airflow can be transferred to the heat receiving plate 57, thereby cooling the phosphor wheel 51.

[0063] In the phosphor unit PS1, the heat receiving plate 57 is formed of a vapor chamber. According to this configuration, the heat transferred from the heat dissipation fins 55 to the heat receiving plate 57 via the airflow and the heat receiving fins 58 is diffused throughout the entire heat receiving plate 57, which is a vapor chamber. This makes it possible to prevent heat from being locally transferred from the heat receiving plate 57 to the heat dissipation device 60, and allows heat to be efficiently transferred from the heat receiving plate 57 to the heat dissipation device 60. This allows the heat to be efficiently dissipated by the heat dissipation device 60.

[0064] The phosphor unit PS1 includes a heat dissipation device 60 that is provided on the opposite side of the heat receiving plate 57 from the phosphor wheel 51 and dissipates heat transferred to the heat receiving plate 57. According to this configuration, the heat of the wavelength converting section 53 transferred to the heat receiving plate 57 can be dissipated by the heat dissipation device 60, so that the heat of the wavelength converting section 53 can be quickly dissipated. Therefore, the cooling efficiency of the wavelength converting section 53 can be improved.

[0065] The phosphor unit PS1 includes a thermoelectric conversion element 59 provided between a heat receiving plate 57 and a heat dissipation device 60. According to this configuration, the thermoelectric conversion element 59 can assist in the heat transfer from the heat receiving plate 57 to the heat dissipation device 60. Therefore, the efficiency of the heat transfer from the heat receiving plate 57 to the heat dissipation device 60 can be improved, and the efficiency of the heat dissipation device 60 in dissipating the heat from the wavelength conversion unit 53 can be improved.

[0066] In the phosphor unit PS1, the heat dissipation device 60 includes a heat sink 601. According to this configuration, the heat transferred to the heat receiving plate 57 is dissipated by the heat sink 601. Therefore, the heat dissipation device 60 can be configured with a relatively simple structure.

[0067] [Second embodiment] Next, a second embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector 1 according to the first embodiment, but the configuration of the heat-receiving fins of the phosphor unit is different. Note that in the following description, parts that are the same or approximately the same as parts already described will be denoted by the same reference numerals and description thereof will be omitted.

[0068] [Projector configuration] FIG. 11 is a cross-sectional view showing a phosphor unit PS2 according to this embodiment. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a phosphor unit PS2 shown in Fig. 11 instead of the phosphor unit PS1 according to the first embodiment. That is, the light source device 3 according to this embodiment has the same configuration and functions as the light source device 3 according to the first embodiment, except that it has a phosphor unit PS2 instead of the phosphor unit PS1 according to the first embodiment.

[0069] [Phosphor unit configuration] The phosphor unit PS2 has the same configuration and function as the phosphor unit PS1 according to the first embodiment, except that it has a heat-receiving fin 61 shown in Fig. 11 instead of the heat-receiving fin 58 according to the first embodiment. Specifically, the phosphor unit PS2 has a peripheral wall 311 of the light source casing 31 and a wavelength conversion device 5B. As shown in Fig. 11, the wavelength conversion device 5B has a phosphor wheel 51, a heat-receiving plate 57, a heat-receiving fin 61, and a heat dissipation device 60, as well as a rotation device 56 and a thermoelectric conversion element 59 which are not shown in Fig. 11.

[0070] [Heat receiving fin configuration] Fig. 12 is a perspective view showing the heat receiving fin 61 provided in the phosphor unit PS2. Fig. 13 is a plan view showing the heat receiving fin 61 as viewed from the +Z direction. In Fig. 12 and Fig. 13, of the multiple second fins 611 constituting the heat receiving fin 61, only some of the second fins 611 are labeled with reference numerals, and of the multiple peripheral wall side fins 612 and multiple heat receiving plate side fins 613 constituting the second fins 611, only some of the peripheral wall side fins 612 and some of the heat receiving plate side fins 613 are labeled with reference numerals. 12 and 13, the heat-receiving fin 61 is provided on the heat-receiving plate 57 so as to be capable of transferring heat. The heat-receiving fin 61 has a plurality of second fins 611 that receive heat from the airflow after passing through the heat-dissipating fins 55 of the phosphor wheel 51 and transfers the received heat to the heat-receiving plate 57. Each of the multiple second fins 611 stands up from the heat receiving plate 57 and extends from the portion on the rotation axis Rx side toward the peripheral wall 311. The multiple second fins 611 are arranged in the circumferential direction around the rotation axis Rx of the phosphor wheel 51. The multiple second fins 611 include multiple peripheral wall side fins 612 and multiple heat receiving plate side fins 613. In this embodiment, the peripheral wall side fins 612 and the heat receiving plate side fins 613 are separate from each other.

[0071] [Configuration of peripheral fins] Fig. 14 is a diagram showing a cross section of the wavelength converter 5B along the XZ plane. In other words, Fig. 14 is a diagram showing the positions of the peripheral wall side fins 612 and the heat dissipation fins 55 in the +Z direction. Note that in Fig. 14, the thermoelectric conversion elements 59 and the heat dissipation devices 60 are omitted from the illustration. As shown in Fig. 11, the multiple peripheral wall side fins 612 are provided between the phosphor wheel 51 and the peripheral wall 311 when viewed from the +Z direction. That is, the multiple peripheral wall side fins 612 are provided between the phosphor wheel 51 and the peripheral wall 311 in a direction perpendicular to the rotation axis Rx. As shown in Fig. 14, the multiple peripheral wall side fins 612 stand upright in the +Z direction from the heat receiving plate 57, and the +Z direction end of each peripheral wall side fin 612 is disposed further in the +Z direction than the -Z direction end of the heat dissipation fin 55. That is, the peripheral wall side fins 612 and the heat dissipation fin 55 are disposed so as to overlap each other in a direction perpendicular to the rotation axis Rx. 11 and 13, the multiple peripheral wall side fins 612 are aligned in the circumferential direction centered on the rotation axis Rx. Each of the multiple peripheral wall side fins 612 extends linearly so as to be inclined clockwise from the end on the rotation axis Rx side toward the peripheral wall 311 when viewed from the +Z direction. That is, each of the multiple peripheral wall side fins 612 extends linearly so as to be inclined in the R1 direction, which is the rotation direction of the phosphor wheel 51, from the end on the rotation axis Rx side toward the peripheral wall 311.

[0072] An air current generated by the rotation of the phosphor wheel 51 flows through each peripheral wall side fin 612. Specifically, among the air currents flowing outward from the phosphor wheel 51, the air currents before reaching the peripheral wall 311 flow through the +Z direction region of each peripheral wall side fin 612. The airflow that is turned back by the peripheral wall 311 flows through the -Z direction region of each peripheral-wall-side fin 612. Therefore, in the peripheral-wall-side fin 612, the flow direction of the airflow flowing through the +Z direction region and the flow direction of the airflow flowing through the -Z direction region are opposite to each other. Each peripheral wall side fin 612 receives heat from the passing air current and transfers the received heat to the heat receiving plate 57 .

[0073] Fig. 15 is a diagram showing a cross section of the heat dissipation fins 55 and the peripheral wall side fins 612 along a plane perpendicular to the +Z direction. In other words, Fig. 15 is a diagram showing the extension direction of the peripheral wall side fins 612. As described above, the first fins 551 constituting the heat dissipation fins 55 extend while curving in the opposite direction to the R1 direction from the end on the rotation axis Rx side toward the outside of the substrate 52. For this reason, the air current that passes between the fins of the first fins 551 flows radially from the outer periphery of the phosphor wheel 51 with the rotation axis Rx as the center, and flows while wrapping around in the R1 direction. 15, each circumferential-wall-side fin 612 extends at an incline in the R1 direction with respect to an imaginary line VL1 connecting the inner circumferential end of the circumferential-wall-side fin 612 and the rotation axis Rx. The inner circumferential end of the circumferential-wall-side fin 612 is the end of the circumferential-wall-side fin 612 on the rotation axis Rx side. In other words, each circumferential-wall-side fin 612 extends at an incline in the opposite direction to the rotation direction of the phosphor wheel 51 with respect to a tangent to the outer circumferential edge of the phosphor wheel 51 on the imaginary line VL1 connecting the inner circumferential end of the circumferential-wall-side fin 612 and the rotation axis Rx.

[0074] In this embodiment, the angle α between the imaginary line VL1 and the extension direction of one of the peripheral wall fins 612 is set to 0°≦α<90°. That is, the intersection angle γ between a tangent TG at the outer periphery of the phosphor wheel 51 located on the imaginary line VL1 connecting the inner periphery end of one of the peripheral wall fins 612 and the rotation axis Rx and the extension direction of the one of the peripheral wall fins 612 is set to 0°<γ≦90°. In other words, the intersection angle γ between a virtual line VL2 that is parallel to the tangent TG and passes through the inner periphery end of the one of the peripheral wall fins 612 and the extension direction of the one of the peripheral wall fins 612 is set to 0°<γ≦90°. More specifically, the multiple peripheral wall side fins 612 are arranged so that the intersection angle γ satisfies 35°≦γ≦85°, and preferably satisfies 40°≦γ≦70°. These ranges are based on the following experimental results.

[0075] FIG. 16 is a graph showing the relationship between the intersection angle γ and the flow speed of the airflow passing through the multiple peripheral-wall side fins 612 and flowing toward the peripheral wall 311. The surface temperature of the wavelength conversion unit 53 can be kept low by smoothly circulating a low-temperature air current through the heat dissipation fins 55. That is, by reducing the flow path resistance when the air current generated by the rotation of the phosphor wheel 51 passes through the multiple peripheral wall side fins 612, the air current can be circulated smoothly, and the surface temperature of the wavelength conversion unit 53 can be maintained low. Based on this knowledge, the inventors of the present invention conducted an experiment in which a plurality of phosphor units PS2 each having a plurality of peripheral fins 612 with different crossing angles γ were constructed, and the flow speed of the air flow passing through the plurality of peripheral fins 612 was measured when the phosphor wheel 51 was rotated. The results of such an experiment are shown in FIG. In the experiment, the number of rotations per unit time of the phosphor wheel 51 was set to 6000 rpm. This number of rotations was determined in consideration of the cooling efficiency of the phosphor wheel 51, as well as the case where the number of rotations per unit time of the phosphor wheel 51 and the driving frequency of the light modulation element 243 coincide with each other, causing flickering.

[0076] According to the experimental results of FIG. 16, it was found that when the crossing angle γ satisfies 35°≦γ≦85°, the flow velocity of the airflow passing through the multiple peripheral wall side fins 612 toward the peripheral wall 311 can be maintained high, and when the crossing angle γ satisfies 40°≦γ≦70°, the flow velocity of the airflow can be maintained even higher.

[0077] FIG. 17 is a graph showing the relationship between the crossing angle γ and the surface temperature of the wavelength converting portion 53. As shown in FIG. The inventors of the present invention have also developed a phosphor having a plurality of peripheral wall side fins 612 with different crossing angles γ. When a plurality of units PS2 are configured and excitation light is incident on the rotating phosphor wheel 51, An experiment was carried out to measure the surface temperature of the wavelength conversion portion 53. The results of such an experiment are shown in FIG. In addition, the number of rotations per unit time of the phosphor wheel 51 in the experiment was the same as in the above experiment. The same is 6000 rpm. According to the experimental results of FIG. 17, when the crossing angle γ satisfies 35°≦γ≦85°, The surface temperature of the conversion portion 53 can be kept low, and the crossing angle γ 40°≦γ≦70° If It was found that the surface temperature of the wavelength converting portion 53 could be maintained even lower. From these experimental results, it was found that the crossing angle γ of the heat receiving fin 61 in this embodiment is 35 The multiple peripheral wall side fins 612 are arranged so as to satisfy the condition of γ≦85°. This improves the cooling efficiency of the length conversion section 53.

[0078] [Configuration of heat receiving plate fins] 14, the heat receiving plate side fins 613 are provided between the heat receiving plate 57 and the heat dissipation fins 55 in the direction along the rotation axis Rx. As shown in Fig. 12 to Fig. 14, the heat receiving plate side fins 613 are provided in an area on the rotation axis Rx side with respect to the peripheral wall side fins 612 when viewed from the +Z direction. The multiple heat receiving plate side fins 613 have the same configuration and function as the multiple second fins 581. That is, each of the multiple heat receiving plate side fins 613 extends from a portion on the rotation axis Rx side toward the peripheral wall 311, and extends linearly so as to be inclined clockwise as it approaches the peripheral wall 311. That is, each of the multiple heat receiving plate side fins 613 extends linearly so as to be inclined in the R1 direction as it approaches the peripheral wall 311 from the end on the rotation axis Rx side. Each of the multiple heat receiving plate side fins 613 is aligned in the circumferential direction centered on the rotation axis Rx. The airflow that has been turned back by the peripheral wall 311 and passed through the multiple peripheral wall fins 612 flows through each heat receiving plate side fin 613, and the multiple heat receiving plate side fins 613 cause the airflow to flow toward the rotation axis Rx. Each heat receiving plate side fin 613 receives heat from the flowing airflow and transfers the received heat to the heat receiving plate 57.

[0079] 13, the fin pitch of the multiple peripheral wall side fins 612 in the circumferential direction centered on the rotation axis Rx is different from the fin pitch of the multiple heat receiving plate side fins 613 in the circumferential direction. To be more specific, the fin pitch of the multiple peripheral wall side fins 612 is smaller than the fin pitch of the multiple heat receiving plate side fins 613. In this embodiment, the fin pitch of the multiple peripheral wall side fins 612 in the circumferential direction is 3.6°, whereas the fin pitch of the multiple heat receiving plate side fins 613 in the circumferential direction is 5.0°. By arranging the multiple peripheral wall side fins 612 and the multiple heat receiving plate side fins 613 at such a fin pitch, the multiple peripheral wall side fins 612 having a large dimension between the outer periphery and the rotation axis Rx can be arranged more densely than the multiple heat receiving plate side fins 613 having a small dimension between the outer periphery and the rotation axis Rx. Therefore, the contact area between the airflow and each of the fins 612, 613 is increased, and smooth circulation of the airflow is realized.

[0080] [Effects of the second embodiment] The projector according to this embodiment described above provides the following effects in addition to the effects similar to those of the projector 1 according to the first embodiment. In the phosphor unit PS1, the multiple second fins 611 include multiple peripheral wall fins 612 arranged between the phosphor wheel 51 and the peripheral wall 311 in a direction perpendicular to the rotation axis Rx. The multiple peripheral wall fins 612 cause the airflow that has flowed to the outside of the phosphor wheel 51 via the peripheral wall fins 612 on the phosphor wheel 51 side to flow to the peripheral wall 311. The peripheral wall 311 then turns the airflow back and causes it to flow to the peripheral wall fins 612 on the heat receiving plate 57 side. The peripheral wall fins 612 on the phosphor wheel 51 side refer to the +Z direction portion of the peripheral wall fins 612, and the peripheral wall fins 612 on the heat receiving plate 57 side refer to the -Z direction portion of the peripheral wall fins 612. According to this configuration, the entirety of the multiple peripheral wall fins 612 standing up from the heat receiving plate 57 can be used to efficiently receive heat from the airflow passing through the heat dissipation fins 55, thereby lowering the temperature of the airflow passing through the heat dissipation fins 55. Therefore, the cooling efficiency of the phosphor wheel 51 can be improved. In addition, the multiple peripheral wall side fins 612 also enable the air current circulating between the phosphor wheel 51, the peripheral wall 311, and the heat receiving plate 57 to circulate smoothly.

[0081] In the phosphor unit PS2, the second fins 611 include a plurality of peripheral wall side fins 612 and a plurality of heat receiving plate side fins 613. The multiple peripheral wall side fins 612 are disposed between the phosphor wheel 51 and the peripheral wall 311 in a direction perpendicular to the rotation axis Rx. The heat-receiving-plate-side fins 613 are provided on the rotation axis Rx side of the peripheral-wall-side fins 612, and are disposed between the heat-receiving plate 57 and the heat-dissipating fins 55 in the direction along the rotation axis Rx. The multiple peripheral wall side fins 612 direct the airflow that has flowed outside the phosphor wheel 51 to the peripheral wall 311, and the multiple heat receiving plate side fins 613 direct the airflow that has been turned back by the peripheral wall 311 to the side of the rotation axis Rx. According to this configuration, the air flow that flows outside the phosphor wheel 51 flows through the multiple peripheral wall side fins 612 and the multiple heat receiving plate side fins 613, and then flows toward the rotation axis Rx side, so that heat can be efficiently received from the air flow, and the cooling efficiency of the air flowing through the phosphor wheel 51, and ultimately the cooling efficiency of the wavelength conversion section 53, can be improved.

[0082] In the phosphor unit PS2, each of the peripheral wall side fins 612 is arranged in the circumferential direction centered on the rotation axis Rx, and each of the heat receiving plate side fins 613 is arranged in the circumferential direction centered on the rotation axis Rx. The fin pitch of the peripheral wall side fins 612 is smaller than the fin pitch of the heat receiving plate side fins 613. With this configuration, the air current circulating through the phosphor wheel 51, the peripheral wall 311, and the heat receiving plate 57 can be smoothly circulated through the multiple peripheral wall side fins 612 and the multiple heat receiving plate side fins 613 arranged as described above. Furthermore, the multiple peripheral wall side fins 612 can be densely arranged outside the multiple heat receiving plate side fins 613. This increases the contact area between the peripheral wall side fins 612 and the airflow, thereby improving the cooling efficiency of the airflow and, ultimately, the cooling efficiency of the phosphor wheel 51. For this reason, the cooling efficiency of the wavelength conversion section 53 relative to the volume of the phosphor unit PS2 is high, and it is possible to reduce the size of the cooling structure of the wavelength conversion section 53. This can therefore contribute to the miniaturization of the phosphor unit PS2, and in turn, the miniaturization of the light source device 3 in which the phosphor unit PS2 is adopted, and further the miniaturization of the projector 1.

[0083] In the phosphor unit PS2, each of the multiple peripheral wall side fins 612 is inclined in the rotation direction of the phosphor wheel 51 from the end on the rotation axis Rx side toward the peripheral wall 311. The intersection angle γ between a tangent TG at the outer periphery of the phosphor wheel 51 located on an imaginary line VL1 connecting an inner periphery side end of one of the multiple peripheral wall side fins 612 and the rotation axis Rx and the extension direction of the one peripheral wall side fin 612 is 35° or more and 85° or less. According to this configuration, the airflow that flows out from the heat dissipation fins 55 to the outside of the phosphor wheel 51 can be efficiently caused to flow between the fins of the multiple peripheral wall side fins 612. Therefore, the efficiency with which the multiple peripheral wall side fins 612 receive heat from the airflow can be improved.

[0084] [Modification of the second embodiment] In the phosphor unit PS2 described above, the heat receiving fin 61 includes a plurality of second fins 611 including a plurality of peripheral wall side fins 612 and a plurality of heat receiving plate side fins 613. The plurality of peripheral wall side fins 612 and the plurality of heat receiving plate side fins 613 are separate. However, this is not limited thereto, and the plurality of second fins 611 constituting the heat receiving fin 61 may be fins in which the peripheral wall side fins 612 and the heat receiving plate side fins 613 are integrated.

[0085] FIG. 18 is a plan view of a heat receiving fin 61A of a phosphor unit PS2A which is a modification of the phosphor unit PS2, viewed from the +Z direction. Specifically, a phosphor unit PS2A which is a modification of the phosphor unit PS2 has a heat receiving fin 61A shown in FIG. 18 instead of the heat receiving fin 61, and has the same configuration and function as the phosphor unit PS2.

[0086] The heat receiving fin 61A has a plurality of second fins 611A arranged in a circumferential direction centered on the rotation axis Rx, and each of the plurality of second fins 611A extends at an incline in the R1 direction from the end on the rotation axis Rx side toward the peripheral wall 311. Each of such second fins 611A is an integrated fin of the peripheral-wall-side fin 612 and the heat-receiving-plate-side fin 613. That is, each of the multiple second fins 611A is a single fin having a peripheral-wall-side fin portion 612A and a heat-receiving-plate-side fin portion 613A. Therefore, the inter-fin pitch of the multiple second fins 611A on the outer periphery of the heat receiving fin 61A is the same as the inter-fin pitch of the multiple second fins 611A on the inner periphery. A projector including such a phosphor unit PS2A can also achieve the same effects as the projector including the above-mentioned phosphor unit PS2.

[0087] [Third embodiment] Next, a third embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector according to the second embodiment, but differs in that the heat-receiving fins have a peripheral wall portion that surrounds a plurality of peripheral-wall side fins 612. In the following description, parts that are the same or approximately the same as parts already described are given the same reference numerals and description thereof will be omitted.

[0088] [Projector configuration] FIG. 19 is a plan view of the heat receiving fins 62 of the phosphor unit PS3 provided in the projector according to this embodiment, viewed from the +Z direction. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a phosphor unit PS3 shown in Fig. 19 instead of the phosphor unit PS1. That is, the light source device 3 according to this embodiment has the same configuration and functions as the light source device 3 according to the first embodiment, except that it has a phosphor unit PS3 instead of the phosphor unit PS1.

[0089] [Phosphor unit configuration] The phosphor unit PS3 has a heat-receiving fin 62 shown in Fig. 19 instead of the heat-receiving fin 58 according to the first embodiment, and has the same configuration and function as the phosphor unit PS1 according to the first embodiment. Specifically, the phosphor unit PS3 has a wavelength conversion device 5C. The wavelength conversion device 5C has the same configuration and function as the wavelength conversion device 5B according to the second embodiment, and has the same configuration and function as the wavelength conversion device 5B according to the second embodiment, and has the same configuration and function as the wavelength conversion device 5B according to the second embodiment. That is, the phosphor unit PS3 includes a phosphor wheel 51, a rotating device 56, a heat receiving plate 57, a heat receiving fin 62, a thermoelectric conversion element 59, and a heat dissipation device 60.

[0090] [Heat receiving fin configuration] The heat receiving fin 62 has the same configuration and function as the heat receiving fin 62 according to the second embodiment, except for further including a peripheral wall portion 624. In detail, the heat receiving fin 62 has a plurality of second fins 611 including a plurality of peripheral wall side fins 612 and a plurality of heat receiving plate side fins 613 according to the second embodiment, and a peripheral wall portion 624.

[0091] [Configuration of the peripheral wall] The peripheral wall portion 624 is located outside the multiple second fins 611 with respect to the rotation axis Rx. The peripheral wall portion 624 is formed in a ring shape surrounding the multiple peripheral wall side fins 612 with the rotation axis Rx as the center, and is disposed closer to the rotation axis Rx side than the peripheral wall 311 of the light source housing 31. More specifically, the peripheral wall portion 624 is formed in a ring shape connecting the outer circumferential end portions of the multiple peripheral wall side fins 612 when viewed from the +Z direction. The dimension of the peripheral wall portion 624 in the +Z direction is approximately the same as the dimension of the peripheral wall side fins 612 in the +Z direction. The end portion of the peripheral wall portion 624 in the −Z direction is connected to the heat receiving plate 57, but it does not have to be connected to the heat receiving plate 57. When the +Z direction end of the peripheral wall side fin 612 is located in the +Z direction further than the second surface 522 of the phosphor wheel 51, the peripheral wall portion 624 may connect between portions of the multiple peripheral wall side fins 612 facing in the +Z direction.

[0092] Fig. 20 is a diagram showing a cross section of the heat receiving fin 62 along the XZ plane. In Fig. 20, in order to make it easier to understand the function of the peripheral wall portion 624, the peripheral wall side fins 612 and the heat receiving plate side fins 613 are partially omitted from the illustration. As shown in Figure 20, the peripheral wall portion 624, like the peripheral wall 311 of the phosphor unit PS2 of the second embodiment, bends back the air flow that is discharged from the rotating phosphor wheel 51 to the outside of the phosphor wheel 51 and flows between the multiple peripheral wall side fins 612.

[0093] Specifically, when the phosphor wheel 51 rotates, an airflow is generated by the heat dissipation fins 55 that flows from the rotation axis Rx side to the outside, as shown by the arrow D1. The airflow that flows out of the phosphor wheel 51 flows between the fins in the +Z direction area of ​​the multiple peripheral wall side fins 612, as shown by the arrow D2, and then turns back at the peripheral wall portion 624. The turned back airflow flows between the fins in the -Z direction area of ​​the multiple peripheral wall side fins 612 to the rotation axis Rx side. The airflow that flows between the fins of the multiple peripheral wall side fins 612 flows between the fins of the multiple heat receiving plate side fins 613 to the rotation axis Rx side, as shown by the arrow D3. Then, the airflow that flows through the center of the heat receiving fin 62 is sucked in again by the rotating phosphor wheel 51, and flows out to the outside of the phosphor wheel 51 via the heat dissipation fins 55, as shown by the arrow D1. In this way, since the peripheral wall portion 624 turns back the air current, the phosphor unit PS3 does not need to include the peripheral wall 311 of the light source housing 31.

[0094] [Effects of the third embodiment] The projector according to the present embodiment described above provides the following effects in addition to the effects achieved by the projector according to the second embodiment. That is, the phosphor unit PS3 includes a phosphor wheel 51, a heat receiving plate 57 and a heat receiving fin 62. The phosphor wheel 51 rotates about a rotation axis Rx. The phosphor wheel 51 includes a substrate 52, a wavelength conversion portion 53, and heat dissipation fins 55. The substrate 52 has a first surface 521 and a second surface 522 that is provided on the opposite side to the first surface 521 and faces the heat receiving plate 57. The substrate 52 rotates about a rotation axis Rx. Wavelength converting portion 53 is disposed on first surface 521 and contains a phosphor that converts the wavelength of incident light. Heat dissipation fins 55 are disposed on second surface 522. Heat dissipation fins 55 have a plurality of first fins that generate an airflow from the center of second surface 522 toward the outside by the rotation of substrate 52 and dissipate heat transferred from wavelength conversion unit 53 to the generated airflow.

[0095] The heat receiving plate 57 is disposed on the rotation axis Rx and intersects with the rotation axis Rx, and faces the phosphor wheel 51. The heat receiving plate 57 is spaced apart from the phosphor wheel 51. The heat receiving fin 62 is fixed to the heat receiving plate 57. The heat receiving fin 62 has a peripheral wall portion 624 and a plurality of second fins 611. The peripheral wall portion 624 includes a plurality of second fins 611 and a peripheral wall portion 624 . The multiple second fins 611 transfer the received heat to the heat-receiving plate 57 . The peripheral wall portion 624 is located outside the multiple second fins 611 with respect to the rotation axis Rx. The airflow from the phosphor wheel 51 circulates to the phosphor wheel 51 via the peripheral wall portion 624 of the heat receiving fin 62 and the plurality of second fins 611 .

[0096] According to such a configuration, like the phosphor unit PS2 according to the second embodiment, the wavelength conversion section 53 can be effectively cooled. Specifically, the airflow passing through the heat dissipation fins 55 and flowing from the phosphor wheel 51 circulates to the phosphor wheel 51 via the peripheral wall portion 624 and the plurality of second fins 611. The circulating airflow passes through the plurality of second fins 611 of the heat receiving fin 62 fixed to the heat receiving plate 57, and the plurality of second fins 611 receive heat from the airflow. The heat received by the plurality of second fins 611 is not only transferred to the heat receiving plate 57, but also received by the heat receiving plate 57 from the airflow. This cools the airflow passing through the heat dissipation fins 55. In this way, the temperature of the airflow passing through the heat dissipation fins 55 can be kept low by the heat receiving fins 62 fixed to the heat receiving plate 57, so that the cooling efficiency of the wavelength conversion unit 53 can be improved. Furthermore, the airflow passing through the heat dissipation fins 55 circulates through the space surrounded by the phosphor wheel 51, the peripheral wall portion 624, and the multiple second fins 611, thereby cooling the heat dissipation fins 55. For this reason, the cooling efficiency of the wavelength conversion section 53 relative to the volume of the phosphor unit PS3 is high, and the cooling structure of the wavelength conversion section 53 can be made compact. This can therefore contribute to the miniaturization of the phosphor unit PS3, and in turn, the miniaturization of the light source device 3 in which the phosphor unit PS3 is employed, and further the projector 1. In addition, similar to the phosphor unit PS2A relating to the modified example of the second embodiment described above, each of the multiple second fins 611 that constitute the heat receiving fin 62 has a peripheral wall side fin portion and a heat receiving plate side fin portion, and may be a fin in which the peripheral wall side fin 612 and the heat receiving plate side fin 613 are integrated.

[0097] [Fourth embodiment] Next, a fourth embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector according to the third embodiment, but differs in that it further includes a heat pipe, which is a heat transport element. Note that in the following description, parts that are the same or substantially the same as parts already described will be given the same reference numerals and descriptions thereof will be omitted.

[0098] [Projector configuration] Fig. 21 is a diagram showing a cross section along the XZ plane of the phosphor unit PS4 included in the projector according to this embodiment. Note that in Fig. 21, the duct 602 and the cooling fan 603 that configure the heat dissipation device 60 are omitted. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a phosphor unit PS4 shown in Fig. 21 instead of the phosphor unit PS1. That is, the light source device 3 according to this embodiment has the same configuration and functions as the light source device 3 according to the first embodiment, except that it has a phosphor unit PS4 instead of the phosphor unit PS1.

[0099] [Phosphor unit configuration] 21 , the phosphor unit PS4 has the same configuration and function as the phosphor unit PS3 according to the third embodiment, except that it further includes a plurality of heat pipes 63. Specifically, the phosphor unit PS4 includes a peripheral wall 311 and a wavelength conversion device 5D. The wavelength conversion device 5D includes a phosphor wheel 51, a rotation device 56, a heat receiving plate 57, a heat receiving fin 62, a thermoelectric conversion element 59, and a heat dissipation device 60, as well as a plurality of heat pipes 63.

[0100] The heat pipes 63 connect the heat receiving fins 62 and the heat dissipation device 60 and transport a portion of the heat received by the heat receiving fins 62 from the airflow to the heat dissipation device 60 . More specifically, each of the heat pipes 63 passes through the heat receiving plate 57 and the thermoelectric conversion element 59 along the rotation axis Rx. One end of each heat pipe 63 is connected to the heat receiving fin 62, and the other end of the heat pipe 63 is connected to the heat sink 601 of the heat dissipation device 60. Each heat pipe 63 is disposed so as to be exposed between the plurality of second fins 611 constituting the heat receiving fin 62, and receives heat from the airflow passing between the plurality of second fins 611.

[0101] The multiple heat pipes 63 include multiple first heat pipes 631 and multiple second heat pipes 632 . Each of the multiple first heat pipes 631 is connected to at least one of the multiple peripheral wall side fins 612 constituting the heat receiving fin 62. The first heat pipe 631 transports a portion of the heat received by the at least one peripheral wall side fin 612 to the heat sink 601. In addition, the first heat pipe 631 transports heat received from the airflow flowing between the multiple peripheral wall side fins 612 to the heat sink 601. Each of the multiple second heat pipes 632 is connected to at least one of the multiple heat receiving plate side fins 613 constituting the heat receiving fin 62. The second heat pipe 632 transports a portion of the heat received by the at least one heat receiving plate side fin 613 to the heat sink 601. In addition, the second heat pipe 632 transports heat received from the airflow flowing between the fins of the multiple heat receiving plate side fins 613 to the heat sink 601.

[0102] [Effects of the fourth embodiment] The projector according to this embodiment achieves the same effects as the projector according to the third embodiment, and also achieves the following effects. The phosphor unit PS4 includes a heat pipe 63 that connects the heat receiving fin 62 and the heat dissipation device 60. According to this configuration, the heat received by the heat receiving fins 62 from the airflow can be transferred not only to the heat dissipation device 60 via the heat receiving plate 57, but also from the heat receiving fins 62 to the heat dissipation device 60 via the heat pipes 63. Therefore, the heat received by the heat receiving fins 62 can be efficiently transferred to the heat dissipation device 60. The phosphor unit PS4 does not necessarily have to include the thermoelectric conversion element 59. Moreover, the phosphor unit PS4 may include, instead of the heat-receiving fin 62, the heat-receiving fin 58 according to the first embodiment or the heat-receiving fin 61 according to the second embodiment.

[0103] [Fifth embodiment] Next, a fifth embodiment of the present disclosure will be described. The projector according to this embodiment has a similar configuration to the projector according to the first embodiment, but differs in that a heat pipe is provided in addition to the configuration and arrangement of the heat receiving fins in the phosphor unit. Note that in the following explanation, parts that are the same or approximately the same as parts already explained are given the same reference numerals and explanations thereof are omitted.

[0104] [Projector configuration] Fig. 22 is a perspective view showing a phosphor unit PS5 included in a projector according to this embodiment, and Fig. 23 is a diagram showing a cross section of the phosphor unit PS5 along the XZ plane. Note that in Figs. 22 and 23, the duct 602 and the cooling fan 603 are omitted, and in Fig. 21, the peripheral wall 311 is also omitted. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a phosphor unit PS5 shown in Fig. 22 and Fig. 23 instead of the phosphor unit PS1. That is, the light source device 3 according to this embodiment has the same configuration and functions as the light source device 3 according to the first embodiment, except that it has a phosphor unit PS5 instead of the phosphor unit PS1.

[0105] [Phosphor unit configuration] The phosphor unit PS5 includes a peripheral wall 311 and a wavelength conversion device 5E. The phosphor units PS1 to PS4 in this embodiment have the same functions as those of the phosphor units PS1 to PS4 in this embodiment. The wavelength converter 5E includes, instead of the heat receiving fin 58, the thermoelectric conversion element 59, and the heat dissipation device 60, In addition to the heat receiving fins 64, the heat pipes 65, and the heat dissipation device 66, Wavelength conversion device 5A and The wavelength conversion device 5E has the same configuration and function as the phosphor wheel 51. The device includes a heat transfer device 56, a heat receiving plate 57, a heat receiving fin 64, a heat pipe 65, and a heat dissipation device 66. .

[0106] [Heat receiving fin configuration] The heat receiving fin 64, like the heat receiving fins 58, 61, and 62, receives heat from the air current flowing outward from the phosphor wheel 51. The heat receiving fin 64 is fixed to the heat receiving plate 57 by a heat pipe 65, which will be described in detail later. The heat receiving fin 64 includes a plurality of second fins 641 extending in a direction perpendicular to the rotation axis Rx and arranged along the rotation axis Rx so as to overlap with the heat receiving plate 57. The second fins 641 include a plurality of peripheral wall side fins 642 and a plurality of heat receiving plate side fins 643. As shown in Fig. 22, each of the peripheral wall side fins 642 and each of the heat receiving plate side fins 643 is formed in a ring shape when viewed from the +Z direction, and as shown in Fig. 23, each of the peripheral wall side fins 642 and each of the heat receiving plate side fins 643 is formed in a flat plate shape.

[0107] 22 and 23, the multiple peripheral wall side fins 642 are disposed between the phosphor wheel 51 and the peripheral wall 311 in a direction perpendicular to the rotation axis Rx, and are disposed side by side in a direction along the rotation axis Rx. That is, the multiple peripheral wall side fins 642 are disposed inside the peripheral wall 311 and surround the phosphor wheel 51. The multiple peripheral wall side fins 642 are disposed between the second surface 522 of the phosphor wheel 51 and the surface 55A of the heat dissipation fin 55 facing the heat receiving plate 57 in the +Z direction along the rotation axis Rx, as shown in FIG. As the phosphor wheel 51 rotates, the air flow that flows from the heat dissipation fin 55 to the outside of the phosphor wheel 51 flows between the fins of the multiple peripheral wall side fins 642, is heated by each peripheral wall side fin 642, and then flows toward the peripheral wall 311. In this embodiment, two peripheral wall side fins 642 are provided.

[0108] 23 , the multiple heat receiving plate side fins 643 are disposed between the surface 55A of the heat dissipation fin 55 and the heat receiving surface 571 of the heat receiving plate 57 in the +Z direction along the rotation axis Rx. The multiple heat receiving plate side fins 643 allow the airflow turned back by the peripheral wall 311 to flow toward the rotation axis Rx side. The multiple heat receiving plate side fins 643 receive heat from the airflow flowing toward the rotation axis Rx side as it flows between the fins of the multiple heat receiving plate side fins 643. Each heat receiving plate side fin 643 has an inner region 6431 overlapping with the heat dissipation fin 55 when viewed from the -Z direction, and an outer region 6432 disposed outside the heat dissipation fin 55. By providing such an outer region 6432 on the heat receiving plate side fin 643, the surface area of ​​the heat receiving plate side fin 643 can be increased, and therefore the contact area with the airflow can be increased. In this embodiment, five heat receiving plate side fins 643 are provided.

[0109] [Heat dissipation device configuration] For convenience of explanation, the heat dissipation device 66 will be described before the heat pipe 65. The heat dissipation device 66 dissipates the heat transferred from the heat pipe 65 to the outside of the light source housing 31. As shown in Fig. 22 and Fig. 23, the heat dissipation device 66 includes a heat sink 661, and also includes a duct 602 and a cooling fan 603 according to the first embodiment, although not shown in Fig. 22 and Fig. 23. The heat sink 661 has a configuration in which a plurality of plate-shaped fins 6611 perpendicular to the rotation axis Rx are arranged along the rotation axis Rx. That is, the cooling gas discharged from the cooling fan 603 and flowing through the duct 602 can flow along the +X direction between the fins of the plurality of fins 6611. The plurality of fins 6611 transfer heat transferred from the heat pipe 65 to the cooling gas flowing between the fins in the +X direction.

[0110] [Heat pipe configuration] Similar to the heat pipe 63 according to the fourth embodiment, the heat pipe 65 connects the heat receiving fins 64 and the heat dissipation device 66. More specifically, the heat pipe 65 connects each second fin 641 of the heat receiving fins 64 and the heat sink 661 of the heat dissipation device 66 in a manner capable of thermal transfer. The heat pipe 65 transports the heat received by the multiple second fins 641 to the heat sink 661.

[0111] In this embodiment, a plurality of heat pipes 65 are provided. Each of the plurality of heat pipes 65 extends along the rotation axis Rx and penetrates the heat receiving plate 57. As shown in FIG. 23 , the plurality of heat pipes 65 include a plurality of first heat pipes 651 and a plurality of second heat pipes 652. An end portion in the +Z direction of each first heat pipe 651 is connected to each peripheral wall side fin 642 and an outer region 6432 of each heat receiving plate side fin 643, and penetrates the heat receiving plate 57 along the rotation axis Rx. In other words, the first heat pipe 651 functions as a support for fixing the peripheral wall side fins 642 and the heat receiving plate side fins 643 to the heat receiving plate 57. An end portion in the -Z direction of each first heat pipe 651 is connected to each fin 6611 of the heat sink 661. An end portion in the +Z direction of each second heat pipe 652 is connected to the inner region 6431 of each heat receiving plate side fin 643, and penetrates the heat receiving plate 57 along the rotation axis Rx. In other words, the second heat pipe 652 functions as a support for fixing the heat receiving plate side fin 643 to the heat receiving plate 57. An end portion in the -Z direction of each second heat pipe 652 is connected to each fin 6611 of the heat sink 661.

[0112] [Heat transfer in phosphor unit] The airflow that has passed between the fins of the heat dissipation fins 55 and been sent to the outside of the phosphor wheel 51 passes between the fins of the multiple peripheral wall side fins 642, has its heat received by each of the peripheral wall side fins 642, and then reaches the peripheral wall 311. The airflow that has been turned back at the peripheral wall 311 passes between the fins of the multiple heat receiving plate side fins 643 toward the rotation axis Rx, and has its heat received by the multiple heat receiving plate side fins 643. The airflow that has passed along each of the heat receiving plate side fins 643 is sucked in by the phosphor wheel 51, passes between the fins of the heat dissipation fins 55 again, and is sent to the outside of the phosphor wheel 51.

[0113] The heat received by the peripheral wall side fins 642 , the heat receiving plate side fins 643 and the heat receiving surface 571 of the heat receiving plate 57 is transported via the heat pipes 65 to the fins 6611 in the duct 602 . The heat transported to the plurality of fins 6611 is transferred to a cooling gas flowing between the plurality of fins 6611 by the cooling fan 603. The cooling gas flowing between the plurality of fins 6611 is exhausted to the outside of the duct 602. In this manner, the heat of the wavelength conversion section 53 disposed inside the light source housing 31 , which is a sealed housing, is dissipated to the outside of the light source housing 31 .

[0114] [Effects of the fifth embodiment] The projector according to the present embodiment described above provides the following effects in addition to the effects achieved by the projector according to the first embodiment. In the phosphor unit PS5, each of the multiple second fins 641 of the heat receiving fin 64 extends in a direction intersecting the rotation axis Rx of the phosphor wheel 51 and is arranged along the rotation axis Rx so as to overlap the heat receiving plate 57. According to this configuration, the airflow flows between the multiple second fins 641 arranged to overlap the heat receiving plate 57. This allows the heat to be transferred from the airflow that has received the heat of the wavelength converting unit 53 to the multiple second fins 641, and the temperature of the airflow flowing through the wavelength converting unit 53 can be lowered.

[0115] In the phosphor unit PS5, the second fins 641 are provided between the heat receiving plate 57 and the heat dissipation fins 55 in the direction along the rotation axis Rx, and include a plurality of heat receiving plate side fins 643 arranged along the rotation axis Rx. The heat receiving plate side fins 643 cause the airflow turned back by the peripheral wall 311 to flow toward the rotation axis Rx side. According to this configuration, the plurality of heat receiving plate side fins 643 receive heat from the airflow that flows from the heat dissipation fins 55 to the peripheral wall 311 and is turned back at the peripheral wall 311 while allowing the airflow to flow toward the rotation axis Rx. This allows the airflow to be smoothly circulated while receiving heat from the airflow.

[0116] In the phosphor unit PS5, the multiple second fins 641 are provided between the phosphor wheel 51 and the peripheral wall 311 in a direction perpendicular to the rotation axis Rx, and include multiple peripheral wall side fins 642 arranged along the rotation axis Rx. The multiple peripheral wall side fins 642 cause the airflow that has circulated outside the phosphor wheel 51 to circulate to the peripheral wall 311. According to this configuration, the airflow that has passed through the heat dissipation fins 55 flows to the peripheral wall side fins 642, and then passes through the peripheral wall 311. The airflow that has passed through the peripheral wall 311 is turned back at the peripheral wall 311, passes through the heat receiving fins 64, and passes through to the rotation axis Rx side. This makes it possible to receive heat from the airflow while smoothly circulating the airflow.

[0117] In the phosphor unit PS5, the second fins 641 include a plurality of peripheral wall side fins 642 and a plurality of heat receiving plate side fins 643. The multiple peripheral wall side fins 642 are provided between the phosphor wheel 51 and the peripheral wall 311 in a direction perpendicular to the rotation axis Rx, and are arranged along the rotation axis Rx. The heat-receiving-plate-side fins 643 are provided between the heat-receiving plate 57 and the heat-dissipating fins 55 in the direction along the rotation axis Rx, and are arranged along the rotation axis Rx. The multiple peripheral wall side fins 642 direct the airflow that has flowed outside the phosphor wheel 51 to the peripheral wall 311, and the multiple heat receiving plate side fins 643 direct the airflow that has been turned back by the peripheral wall 311 to the side of the rotation axis Rx. According to this configuration, the airflow that has flowed outside the phosphor wheel 51 flows through the multiple peripheral wall side fins 642 and the multiple heat receiving plate side fins 643, and then flows toward the rotation axis Rx side, so that heat can be efficiently received from the airflow and the airflow can be smoothly circulated. Therefore, the cooling efficiency of the airflow flowing through the phosphor wheel 51, and therefore the cooling efficiency of the wavelength conversion unit 53, can be improved.

[0118] The phosphor unit PS5 includes a heat pipe 6 that connects the heat receiving fin 64 and the heat dissipation device 66. Equipped with 5. According to this configuration, the heat received by the heat receiving fins 64 from the air flow is transferred to the heat receiving plate 57. The heat received by the heat receiving fins 64 can be transferred to the heat dissipation device 66. The heat can be efficiently transferred to the heat dissipation device 66 . Also, The first heat pipe 651 , including peripheral wall side fins 642 and heat receiving plate side fins 643 The second fins 641 function as supports for fixing the second fins 641 to the heat receiving plate 57. There is no need to provide a separate support. Therefore, the heat transfer from the heat receiving fin 64 to the heat dissipation device 66 is efficient. In order to efficiently carry out the process, the phosphor unit PS5 is configured and the phosphor unit PS5 is This makes it possible to prevent an increase in the number of parts.

[0119] [Modifications of the embodiment] The present disclosure is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present disclosure are included in the present disclosure. In each of the above-described embodiments, the heat dissipation devices 60, 66 include the heat sinks 601, 661, the duct 602, and the cooling fan 603. That is, the heat dissipation devices 60, 66 dissipate heat from the wavelength conversion unit 53 to the cooling gas circulating outside the light source housing 31. However, the present invention is not limited to this, and the heat dissipation devices may include other configurations.

[0120] FIG. 24 is a perspective view showing a heat dissipation device 67 connected to a heat dissipation surface 572 of a heat receiving plate 57 via a thermoelectric conversion element 59. As shown in FIG. For example, instead of the heat dissipation devices 60 and 66, a heat dissipation device 67 shown in FIG. 24 may be employed for the phosphor units PS1, PS2, PS2A, and PS3. The heat dissipation device 67 has an inflow portion 671 and an outflow portion 672, and is configured so that a cooling liquid can flow inside. That is, inside the heat dissipation device 67, a flow path (not shown) through which the cooling liquid flows is provided. In the heat dissipation device 67, the cooling liquid flowing to the inlet portion 671 along the arrow F1 flows through a flow path in the heat dissipation device 67 along the arrow F2, and is discharged from the outlet portion 672 along the arrow F3. The heat dissipation device 67 transfers heat transferred from the heat receiving plate 57 via the thermoelectric conversion element 59 to the cooling liquid flowing inside.

[0121] Like this Heat dissipation device 67 is used in phosphor units PS1, PS2, PS2A, and PS3. If this is done, the following effects can be achieved. The heat dissipation device 67 transfers the transferred heat to a cooling liquid flowing inside. According to this configuration, the heat transferred from the heat receiving plate 57 is transferred to the cooling liquid flowing inside. Therefore, the heat dissipation efficiency of the heat dissipation device 67 can be improved. 3. The cooling efficiency can be improved. In addition, a part of the heat pipe 65 is disposed inside the heat dissipation device 67, If the heat transported by the phosphor unit 5 can be transferred to the cooling liquid, the phosphor unit according to the fourth embodiment can be used. It is also possible to employ a heat dissipation device 67 in the PS4.

[0122] In each of the above embodiments, the peripheral wall 311 constitutes a part of the light source housing 31. However, this is not limited thereto, and the peripheral wall constituting the phosphor unit may be a member independent of the light source housing 31, like the peripheral wall portion 624 according to the third embodiment. In this case, the peripheral wall may be a member connected to the light source housing 31.

[0123] In the second to fourth embodiments, the heat receiving fins 61, 62 have a plurality of second fins 611 including a plurality of peripheral wall side fins 612 and a plurality of heat receiving plate side fins 613. In the fifth embodiment, the heat receiving fin 64 has a plurality of second fins 641 including a plurality of peripheral wall side fins 642 and a plurality of heat receiving plate side fins 643. However, this is not limited thereto, and the plurality of second fins constituting the heat receiving fin may include either the peripheral wall side fins or the heat receiving plate side fins, and may not include the other fin. Furthermore, the number of the peripheral wall side fins and the number of the heat receiving plate side fins are not limited to the above and may be changed as appropriate.

[0124] In the second to fourth embodiments, the peripheral wall side fins 612 are inclined in the rotation direction of the phosphor wheel 51 from the end on the rotation axis Rx side toward the peripheral wall 311. The intersection angle γ between the tangent TG at the outer periphery of the phosphor wheel 51 located on the imaginary line VL1 connecting the end of the peripheral wall side fin 612 on the rotation axis Rx side and the rotation axis Rx and the extension direction of the peripheral wall side fins 612 from the end on the rotation axis Rx side is 35° or more and 85° or less. However, this is not limited to the above, and the extension direction of the peripheral wall side fins is not limited to the above.

[0125] In the above embodiments, the phosphor units PS1, PS2, PS2A, PS3, PS4, and PS5 are provided with the heat dissipation devices 60 and 66. As described above, the phosphor units PS1, PS2, PS2A, PS3, PS4, and PS5 can employ the heat dissipation device 67. However, this is not limiting, and for example, as long as the heat can be efficiently dissipated to the outside of the light source housing 31 by the heat receiving plate 57, the heat dissipation device may not be necessary.

[0126] In the above-described embodiments, the phosphor units PS1, PS2, PS2A, PS3, PS4, and PS5 each include a thermoelectric conversion element 59 provided between the heat receiving plate 57 and the heat dissipation device 60, 66. However, this is not limiting, and the thermoelectric conversion element 59 may be omitted. The same applies to the case where the heat dissipation device 67 is employed.

[0127] In each of the above embodiments, the projector includes three light modulation elements 243R, 243G, and 243B. However, the present invention is not limited to this, and the above configuration can be applied to a projector including two or less light modulation elements, or four or more light modulation elements. In each of the above-described embodiments, the optical components constituting the image projection device 2 are disposed in the substantially L-shaped optical components housing 25 as shown in Fig. 1. However, the present invention is not limited to this, and the optical components constituting the image projection device 2 may be disposed in, for example, a substantially U-shaped optical components housing.

[0128] In the above embodiments, a transmissive liquid crystal panel having different light incident and light exit surfaces is exemplified as the light modulation element 243. However, the light modulation element may be configured with a reflective liquid crystal panel having the same light incident and light exit surfaces. In addition, a light modulation element other than a liquid crystal may be used, such as a device using a micromirror, for example, a DMD (Digital Micromirror Device), etc., as long as the light modulation element is capable of modulating an incident light beam to form an image according to image information.

[0129] In each of the above embodiments, the light source device 3 is applied to a projector. However, the light source device according to the present disclosure may be used in lighting fixtures, headlights of automobiles, and the like.

[0130] [Summary of this disclosure] The following is a summary of this disclosure. [Appendix 1] a phosphor wheel that rotates around an axis of rotation; a peripheral wall surrounding the phosphor wheel in a circumferential direction about the rotation axis; a heat receiving plate that is disposed on the rotation axis, intersects with the rotation axis, faces the phosphor wheel, and is spaced apart from the phosphor wheel; a heat receiving fin fixed to the heat receiving plate and surrounded by the peripheral wall, The phosphor wheel is a substrate having a first surface and a second surface provided on the opposite side of the first surface and facing the heat receiving plate, the substrate rotating about the rotation axis; a wavelength conversion unit disposed on the first surface and containing a phosphor that converts the wavelength of incident light; a heat dissipation fin having a plurality of first fins that are disposed on the second surface, generate an airflow from the center of the second surface toward the outside by rotation of the substrate, and dissipate heat transferred from the wavelength conversion unit into the generated airflow; The phosphor unit is characterized in that the heat receiving fin has a plurality of second fins through which air circulating from the phosphor wheel via the peripheral wall and the heat receiving plate flows, receiving heat from the circulating air flow and transferring it to the heat receiving plate.

[0131] According to this configuration, the phosphor contained in the wavelength conversion unit generates heat when converting the wavelength of the incident light. A part of the heat generated by the phosphor is transferred to the substrate, and a part of the heat transferred to the substrate is transferred to the heat dissipation fins via the substrate. When the substrate rotates, the gas around the first surface of the substrate flows through the wavelength converting section, cooling the wavelength converting section. Furthermore, when the substrate rotates, the heat dissipation fins provided on the second surface generate an airflow from the center of the second surface to the outside. The generated airflow flows through the first fins, and the heat transferred from the wavelength conversion unit to the first fins via the substrate is transferred to the airflow. This further cools the wavelength conversion unit.

[0132] The airflow that has passed through the heat dissipation fins is turned back by the peripheral wall surrounding the phosphor wheel and flows toward the center of the second surface, which becomes negative pressure due to the rotation of the substrate. That is, the airflow that has passed outside the phosphor wheel circulates to the center of the second surface via the peripheral wall and the heat receiving plate. The circulating airflow passes between the second fins of the heat receiving fin fixed to the heat receiving plate, and the second fins receive heat from the airflow. The heat received by the second fins is not only transferred to the heat receiving plate, but also received by the heat receiving plate from the airflow. This cools the airflow toward the area on the central side of the second surface. The cooled airflow then passes through the heat dissipation fins again in the process of passing from the center of the second surface to the outside. In this way, the temperature of the air flowing through the heat dissipation fins can be kept low by the heat receiving fins fixed to the heat receiving plate, so that the cooling efficiency of the wavelength conversion section can be improved. Furthermore, the airflow passing through the heat dissipation fins passes through the space surrounded by the phosphor wheel, the peripheral wall, and the heat receiving plate, thereby cooling the heat dissipation fins, allowing the cooling structure for the wavelength conversion section to be configured compactly.

[0133] [Appendix 2] In the phosphor unit according to Supplementary Note 1, The phosphor unit according to claim 1, wherein each of the second fins stands up from the heat receiving plate and extends from a portion on the rotating shaft side toward the peripheral wall. According to this configuration, the second fins can be arranged along the flow direction of the airflow from the peripheral wall to the rotating shaft side. This makes it easier for the airflow to flow between the second fins, and makes it easier for each second fin to receive heat from the airflow. This increases the efficiency of heat transfer from the airflow to the heat receiving fins.

[0134] [Appendix 3] In the phosphor unit according to Supplementary Note 1 or 2, the second fins include a plurality of heat receiving plate side fins arranged between the heat receiving plate and the heat dissipation fin in a direction along the rotation axis, The phosphor unit according to claim 1, wherein the plurality of heat receiving plate side fins allow the airflow that is turned back by the peripheral wall to flow toward the rotation shaft side. With this configuration, the heat receiving plate side fins can receive heat from the airflow that flows outward from the heat dissipation fins and turns back at the peripheral wall. Therefore, while circulating the airflow, the heat of the airflow can be transferred to the heat receiving plate to cool the phosphor wheel.

[0135] [Appendix 4] In the phosphor unit according to Supplementary Note 1 or 2, the second fins include a plurality of peripheral wall fins disposed between the phosphor wheel and the peripheral wall in a direction perpendicular to the rotation axis, The phosphor unit according to claim 1, wherein the plurality of peripheral wall side fins allow an air flow that has circulated outside the phosphor wheel to circulate around the peripheral wall. With this configuration, the peripheral wall fins can efficiently receive heat from the airflow passing through the heat dissipation fins, thereby lowering the temperature of the airflow passing through the heat dissipation fins, thereby improving the cooling efficiency of the phosphor wheel. In addition, the multiple peripheral wall fins can ensure smooth airflow between the phosphor wheel, the peripheral wall, and the heat receiving plate.

[0136] [Appendix 5] In the phosphor unit according to Supplementary Note 1 or 2, The plurality of second fins include a plurality of peripheral wall side fins disposed between the phosphor wheel and the peripheral wall in a direction perpendicular to the rotation axis; a plurality of heat receiving plate side fins provided on the rotation shaft side of the plurality of peripheral wall side fins and disposed between the heat receiving plate and the heat dissipation fins in a direction along the rotation shaft; the plurality of peripheral wall side fins allow the airflow that has circulated around the outside of the phosphor wheel to circulate around the peripheral wall; The phosphor unit according to claim 1, wherein the plurality of heat receiving plate side fins allow the airflow that is turned back by the peripheral wall to flow toward the rotation shaft side. With this configuration, the air flow that flows outside the phosphor wheel flows through multiple peripheral wall side fins and multiple heat receiving plate side fins, and then flows to the rotating shaft side, so that heat can be efficiently received from the air flow, and the cooling efficiency of the air flow flowing through the phosphor wheel, and ultimately the cooling efficiency of the wavelength conversion section, can be improved. Therefore, the cooling efficiency of the wavelength conversion unit relative to the volume of the phosphor unit is high, and the cooling structure for the wavelength conversion unit can be made compact, which contributes to the miniaturization of the phosphor unit and, in turn, the miniaturization of devices such as light source devices in which the phosphor unit can be used.

[0137] [Appendix 6] In the phosphor unit according to Supplementary Note 5, Each of the plurality of peripheral wall side fins is arranged along a circumferential direction centered on the rotation axis, Each of the plurality of heat receiving plate side fins is arranged along a circumferential direction around the rotation axis, A phosphor unit, characterized in that the pitch between the peripheral wall side fins is smaller than the pitch between the heat receiving plate side fins. With this configuration, the peripheral fins can be densely arranged outside the heat receiving plate fins, which increases the contact area between the peripheral fins and the airflow, thereby improving the cooling efficiency of the airflow and, ultimately, the cooling efficiency of the phosphor wheel.

[0138] [Appendix 7] In the phosphor unit according to any one of Supplementary Note 4 to Supplementary Note 6, each of the peripheral wall side fins is inclined in a rotation direction of the phosphor wheel from the end of the peripheral wall side toward the rotation shaft side, A phosphor unit characterized in that the intersection angle between a tangent to the outer peripheral edge of the phosphor wheel located on a virtual line connecting the rotation shaft side end of one of the multiple peripheral wall side fins and the rotation shaft and the extension direction of the one peripheral wall side fin from the rotation shaft side end is 35° or more and 85° or less. With this configuration, the airflow flowing out from the heat dissipation fins can be efficiently introduced into the spaces between the peripheral fins, thereby improving the efficiency with which the peripheral fins receive heat from the airflow.

[0139] [Appendix 8] In the phosphor unit according to Supplementary Note 1, A phosphor unit characterized in that each of the multiple second fins extends along a plane intersecting the rotation axis and is arranged along the rotation axis so as to overlap the heat receiving plate. With this configuration, the airflow flows between the multiple second fins arranged to overlap the heat receiving plate, so that the heat from the wavelength conversion unit can be transferred from the airflow to the multiple second fins, thereby lowering the temperature of the airflow flowing through the wavelength conversion unit.

[0140] [Appendix 9] In the phosphor unit according to Supplementary Note 8, the second fins are provided between the heat receiving plate and the heat dissipation fin in a direction along the rotation axis, and include a plurality of heat receiving plate side fins arranged along the rotation axis, The phosphor unit according to claim 1, wherein the plurality of heat receiving plate side fins allow the airflow that is turned back by the peripheral wall to flow toward the rotation shaft side. According to this configuration, the plurality of heat receiving plate fins receive heat from the airflow that flows from the heat dissipation fins to the peripheral wall and is then turned back by the peripheral wall while circulating the airflow toward the rotating shaft. This allows the airflow to be smoothly circulated while receiving heat from the airflow.

[0141] [Appendix 10] In the phosphor unit according to Supplementary Note 8 or 9, the second fins are provided between the phosphor wheel and the peripheral wall in a direction perpendicular to the rotation axis, and include a plurality of peripheral wall side fins arranged along the rotation axis; The phosphor unit according to claim 1, wherein the plurality of peripheral wall side fins allow an air flow that has circulated outside the phosphor wheel to circulate around the peripheral wall. With this configuration, the airflow that has passed through the heat dissipation fins flows to the peripheral wall fins and then passes through the peripheral wall. The airflow that has passed through the peripheral wall is turned back at the peripheral wall, passes through the heat receiving fins, and passes through the rotating shaft side. This allows the airflow to circulate smoothly while receiving heat from the airflow.

[0142] [Appendix 11] In the phosphor unit according to Supplementary Note 8, The plurality of second fins include a plurality of peripheral wall side fins provided between the phosphor wheel and the peripheral wall in a direction perpendicular to the rotation axis and arranged along the rotation axis; a plurality of heat receiving plate side fins provided between the heat receiving plate and the heat dissipation fins in a direction along the rotation axis and arranged along the rotation axis; the plurality of peripheral wall side fins allow the airflow that has circulated around the outside of the phosphor wheel to circulate around the peripheral wall; The phosphor unit according to claim 1, wherein the plurality of heat receiving plate side fins allow the airflow that is turned back by the peripheral wall to flow toward the rotation shaft side. According to this configuration, the airflow that has flowed outside the phosphor wheel flows through the multiple peripheral wall fins and the multiple heat receiving plate fins, and then flows to the rotating shaft side, so that heat can be efficiently received from the airflow and the airflow can be smoothly circulated. Therefore, the cooling efficiency of the airflow flowing through the phosphor wheel, and therefore the cooling efficiency of the wavelength conversion unit, can be improved.

[0143] [Appendix 12] a phosphor wheel that rotates around an axis of rotation; a heat receiving plate that is disposed on the rotation axis, intersects with the rotation axis, faces the phosphor wheel, and is spaced apart from the phosphor wheel; A heat receiving fin fixed to the heat receiving plate, The phosphor wheel is a substrate having a first surface and a second surface provided on the opposite side of the first surface and facing the heat receiving plate, the substrate rotating about the rotation axis; a wavelength conversion unit disposed on the first surface and containing a phosphor that converts the wavelength of incident light; a heat dissipation fin having a plurality of first fins that are disposed on the second surface, generate an air flow from the center of the second surface toward the outside by rotation of the substrate, and dissipate heat transferred from the wavelength conversion unit into the generated air flow; The heat receiving fin is A plurality of second fins that transfer the received heat to the heat receiving plate; a peripheral wall portion located outside the plurality of second fins with respect to the rotation axis, A phosphor unit, characterized in that an air flow flowing from the phosphor wheel circulates to the phosphor wheel via the peripheral wall portion of the heat receiving fin and the plurality of second fins.

[0144] According to this configuration, like the phosphor unit described above, the wavelength conversion section can be effectively cooled. That is, the airflow that flows from the phosphor wheel through the heat dissipation fins circulates to the phosphor wheel via the peripheral wall and the multiple second fins. The circulating airflow flows through the multiple second fins of the heat receiving fin fixed to the heat receiving plate, and the multiple second fins receive heat from the airflow. The heat received by the multiple second fins is not only transferred to the heat receiving plate, but the heat receiving plate also receives heat from the airflow. This cools the airflow that flows through the heat dissipation fins. In this way, the temperature of the air flowing through the heat dissipation fins can be kept low by the heat receiving fins fixed to the heat receiving plate, so that the cooling efficiency of the wavelength conversion section can be improved. In addition, the airflow passing through the heat dissipation fins circulates through the space surrounded by the phosphor wheel, the peripheral wall, and the multiple second fins to cool the heat dissipation fins. Therefore, the cooling efficiency of the wavelength conversion unit relative to the volume of the phosphor unit is high, and the cooling structure for the wavelength conversion unit can be made compact. This contributes to the miniaturization of the phosphor unit, and ultimately to the miniaturization of devices such as light source devices in which the phosphor unit can be used.

[0145] [Appendix 13] 13. The phosphor unit according to claim 1, A phosphor unit, characterized in that the heat receiving plate is constituted by a vapor chamber. With this configuration, the heat transferred from the heat dissipation fins to the heat receiving plate is diffused throughout the entire heat receiving plate, which is the vapor chamber. This makes it possible to prevent heat from being transferred locally from the heat receiving plate to the heat dissipation device, and allows the heat to be efficiently transferred from the heat receiving plate to the heat dissipation device. Therefore, the heat can be efficiently dissipated by the heat dissipation device.

[0146] [Appendix 14] In the phosphor unit according to any one of Supplementary Note 1 to Supplementary Note 13, A phosphor unit comprising: a heat dissipation device provided on the opposite side of the heat receiving plate from the phosphor wheel, the heat dissipation device dissipating heat transferred to the heat receiving plate. According to this configuration, the heat dissipated to the heat receiving plate can be dissipated by the heat dissipation device, so that the heat of the wavelength conversion section can be dissipated quickly, thereby improving the cooling efficiency of the wavelength conversion section.

[0147] [Appendix 15] In the phosphor unit according to Supplementary Note 14, A phosphor unit comprising a heat pipe connecting the heat receiving fin and the heat dissipation device. According to this configuration, the heat received by the heat receiving fins from the airflow can be transferred not only to the heat receiving plate but also to the heat dissipation device, so that the heat received by the heat receiving fins can be efficiently transferred to the heat dissipation device.

[0148] [Appendix 16] In the phosphor unit according to Supplementary Note 14 or 15, A phosphor unit comprising a thermoelectric conversion element provided between the heat receiving plate and the heat dissipation device. According to this configuration, the thermoelectric conversion element can assist the heat transfer from the heat receiving plate to the heat dissipation device, thereby improving the efficiency of the heat transfer from the heat receiving plate to the heat dissipation device, and thus improving the efficiency of the heat dissipation device in dissipating the heat from the wavelength conversion unit.

[0149] [Appendix 17] 17. The phosphor unit according to claim 14, The phosphor unit, wherein the heat dissipation device comprises a heat sink. According to this configuration, the heat transferred to the heat receiving plate is dissipated by the heat sink, so that the heat dissipation device can be configured with a relatively simple structure.

[0150] [Appendix 18] 17. The phosphor unit according to claim 14, The phosphor unit is characterized in that the heat dissipation device transfers the transferred heat to a cooling liquid flowing inside the phosphor unit. According to this configuration, the heat transferred from the heat receiving plate is transferred to the cooling liquid flowing inside, so that the heat dissipation efficiency of the heat dissipation device can be improved, and therefore the cooling efficiency of the wavelength conversion section can be improved.

[0151] [Appendix 19] A phosphor unit according to any one of Supplementary Note 1 to Supplementary Note 18; a solid-state light-emitting element that emits excitation light incident on the phosphor unit; The light source device is characterized in that, when the excitation light is incident on the phosphor unit, the phosphor unit emits light containing fluorescence obtained by converting the wavelength of the excitation light. According to such a configuration, the wavelength conversion section of the phosphor wheel has a high cooling effect, so that the amount of excitation light incident on the wavelength conversion section can be increased, and a light source device with a large amount of emitted light can be configured.

[0152] [Appendix 20] A light source device according to claim 19; a light modulation element that modulates light from the light source device into image light; a projection optical device that projects the image light. According to such a configuration, it is possible to obtain the same effect as the light source device, and it is possible to configure a projector capable of projecting image light with high brightness. [Explanation of symbols]

[0153] 1...projector, 243...light modulation element, 26...projection optical device, 3...light source device, 31...light source housing, 311...peripheral wall, 32...light source, 321...solid light emitting element, 5A, 5B, 5C, 5D, 5E...wavelength conversion device, 51...phosphor wheel, 52...substrate, 521...first surface, 522...second surface, 53...wavelength conversion section, 54...reflection section, 55...heat dissipation fin, 551...first fin, 56...rotation device, 57...heat receiving plate, 571...heat receiving surface, 572...heat dissipation surface, 58...heat receiving fin, 581...second fin (heat receiving plate side fin), 59...thermoelectric conversion element, 60...heat dissipation device, 601...heat sink, 602...duct , 6025...exhaust port, 603...cooling fan, 61...heat receiving fin, 611...second fin, 612...circumferential wall side fin, 613...heat receiving plate side fin, 62...heat receiving fin, 624...circumferential wall portion, 63...heat pipe, 631...first heat pipe, 632...second heat pipe, 64...heat receiving fin, 641...second fin, 642...circumferential wall side fin, 643...heat receiving plate side fin, 65...heat pipe, 651...first heat pipe, 652...second heat pipe, 66...heat dissipation device, 661...heat sink, 67...heat dissipation device, PS1, PS2, PS2A, PS3, PS4, PS5...phosphor unit.

Claims

1. a phosphor wheel that rotates around an axis of rotation; a peripheral wall surrounding the phosphor wheel in a circumferential direction about the rotation axis; a heat receiving plate that is disposed on the rotation axis, intersects with the rotation axis, faces the phosphor wheel, and is spaced apart from the phosphor wheel; A heat receiving fin fixed to the heat receiving plate, The phosphor wheel is a substrate having a first surface and a second surface provided on an opposite side to the first surface and facing the heat receiving plate, the substrate rotating about the rotation axis; A wavelength conversion unit disposed on the first surface and containing a phosphor that converts the wavelength of incident light; a heat dissipation fin having a plurality of first fins that are disposed on the second surface, generate an air flow from the center of the second surface toward the outside by rotation of the substrate, and dissipate heat transferred from the wavelength conversion unit into the generated air flow; the heat receiving fin includes a plurality of second fins through which an air flow circulating from the phosphor wheel through the peripheral wall and the heat receiving plate flows, the second fins receive heat from the circulating air flow, and transfer the heat to the heat receiving plate; The plurality of second fins include a plurality of peripheral wall side fins disposed between the phosphor wheel and the peripheral wall in a direction perpendicular to the rotation axis; a plurality of heat receiving plate side fins provided on the rotation shaft side of the plurality of peripheral wall side fins and disposed between the heat receiving plate and the heat dissipation fins in a direction along the rotation shaft; the plurality of peripheral wall side fins allow the airflow that has circulated around the outside of the phosphor wheel to circulate around the peripheral wall; The plurality of heat receiving plate side fins allow the airflow turned back by the peripheral wall to flow toward the rotating shaft, Each of the plurality of peripheral wall side fins is arranged along a circumferential direction centered on the rotation axis, Each of the plurality of heat receiving plate side fins is arranged along a circumferential direction around the rotation axis, A phosphor unit, characterized in that the pitch between the peripheral wall side fins is smaller than the pitch between the heat receiving plate side fins.

2. The phosphor unit according to claim 1 , each of the peripheral wall side fins is inclined in a rotation direction of the phosphor wheel from the end of the peripheral wall side toward the rotation shaft side, A phosphor unit characterized in that the intersection angle between a tangent to the outer peripheral edge of the phosphor wheel located on a virtual line connecting the rotation shaft side end of one of the multiple peripheral wall side fins and the rotation shaft and the extension direction of the one peripheral wall side fin from the rotation shaft side end is 35° or more and 85° or less.

3. A phosphor wheel that rotates around an axis of rotation; a peripheral wall surrounding the phosphor wheel in a circumferential direction about the rotation axis; a heat receiving plate that is disposed on the rotation axis, intersects with the rotation axis, faces the phosphor wheel, and is spaced apart from the phosphor wheel; A heat receiving fin fixed to the heat receiving plate, The phosphor wheel is a substrate having a first surface and a second surface provided on an opposite side to the first surface and facing the heat receiving plate, the substrate rotating about the rotation axis; A wavelength conversion unit disposed on the first surface and containing a phosphor that converts the wavelength of incident light; a heat dissipation fin having a plurality of first fins that are disposed on the second surface, generate an air flow from the center of the second surface toward the outside by rotation of the substrate, and dissipate heat transferred from the wavelength conversion unit into the generated air flow; the heat receiving fin includes a plurality of second fins through which an air flow circulating from the phosphor wheel through the peripheral wall and the heat receiving plate flows, the second fins receive heat from the circulating air flow, and transfer the heat to the heat receiving plate; Each of the plurality of second fins extends along a plane intersecting the rotation axis, and A phosphor unit, characterized in that it is arranged along the rotation axis so as to overlap the heat receiving plate.

4. The phosphor unit according to claim 3 , The phosphor unit, characterized in that the plurality of second fins allow the air flow that is turned back by the peripheral wall to flow toward the rotation shaft.

5. The phosphor unit according to claim 3 , The second fins are provided between the heat receiving plate and the heat dissipation fin in a direction along the rotation axis, and include a plurality of heat receiving plate side fins arranged along the rotation axis, The phosphor unit according to claim 1, wherein the plurality of heat receiving plate side fins allow the airflow that is turned back by the peripheral wall to flow toward the rotation shaft side.

6. The phosphor unit according to claim 3 , the second fins are provided between the phosphor wheel and the peripheral wall in a direction perpendicular to the rotation axis, and include a plurality of peripheral wall side fins arranged along the rotation axis; The phosphor unit according to claim 1, wherein the plurality of peripheral wall side fins allow an air flow that has circulated outside the phosphor wheel to circulate around the peripheral wall.

7. The phosphor unit according to claim 3 , The plurality of second fins include a plurality of peripheral wall side fins provided between the phosphor wheel and the peripheral wall in a direction perpendicular to the rotation axis and arranged along the rotation axis; a plurality of heat receiving plate side fins provided between the heat receiving plate and the heat dissipation fins in a direction along the rotation axis and arranged along the rotation axis; the plurality of peripheral wall side fins allow the airflow that has circulated around the outside of the phosphor wheel to circulate around the peripheral wall; The phosphor unit according to claim 1, wherein the plurality of heat receiving plate side fins allow the airflow that is turned back by the peripheral wall to flow toward the rotation shaft side.

8. a phosphor wheel that rotates around an axis of rotation; a heat receiving plate that is disposed on the rotation axis, intersects with the rotation axis, faces the phosphor wheel, and is spaced apart from the phosphor wheel; A heat receiving fin fixed to the heat receiving plate, The phosphor wheel is a substrate having a first surface and a second surface provided on an opposite side to the first surface and facing the heat receiving plate, the substrate rotating about the rotation axis; A wavelength conversion unit disposed on the first surface and containing a phosphor that converts the wavelength of incident light; a heat dissipation fin having a plurality of first fins that are disposed on the second surface, generate an air flow from the center of the second surface toward the outside by rotation of the substrate, and dissipate heat transferred from the wavelength conversion unit into the generated air flow; The heat receiving fin is A plurality of second fins that transfer the received heat to the heat receiving plate; a peripheral wall portion located outside the plurality of second fins with respect to the rotation axis, the airflow from the phosphor wheel circulates to the phosphor wheel via the peripheral wall portion of the heat receiving fin and the plurality of second fins; A phosphor unit, characterized in that the heat receiving plate is constituted by a vapor chamber.

9. A phosphor wheel that rotates around an axis of rotation; a peripheral wall surrounding the phosphor wheel in a circumferential direction about the rotation axis; a heat receiving plate that is disposed on the rotation axis, intersects with the rotation axis, faces the phosphor wheel, and is spaced apart from the phosphor wheel; A heat receiving fin fixed to the heat receiving plate, The phosphor wheel is a substrate having a first surface and a second surface provided on an opposite side to the first surface and facing the heat receiving plate, the substrate rotating about the rotation axis; A wavelength conversion unit disposed on the first surface and containing a phosphor that converts the wavelength of incident light; a heat dissipation fin having a plurality of first fins that are disposed on the second surface, generate an air flow from the center of the second surface toward the outside by rotation of the substrate, and dissipate heat transferred from the wavelength conversion unit into the generated air flow; the heat receiving fin includes a plurality of second fins through which an air flow circulating from the phosphor wheel through the peripheral wall and the heat receiving plate flows, the second fins receive heat from the circulating air flow, and transfer the heat to the heat receiving plate; A phosphor unit, characterized in that the heat receiving plate is constituted by a vapor chamber.

10. The phosphor unit according to any one of claims 1 to 9, A phosphor unit comprising: a heat dissipation device provided on the opposite side of the heat receiving plate from the phosphor wheel, the heat dissipation device dissipating heat transferred to the heat receiving plate.

11. The phosphor unit according to claim 10, A phosphor unit comprising a heat pipe connecting the heat receiving fin and the heat dissipation device.

12. The phosphor unit according to claim 10, A phosphor unit comprising a thermoelectric conversion element provided between the heat receiving plate and the heat dissipation device.

13. The phosphor unit according to claim 10, The phosphor unit, wherein the heat dissipation device comprises a heat sink.

14. The phosphor unit according to claim 10, The phosphor unit is characterized in that the heat dissipation device transfers the transferred heat to a cooling liquid flowing inside the phosphor unit.

15. The phosphor unit according to any one of claims 1 to 9, a solid-state light-emitting element that emits excitation light incident on the phosphor unit; The light source device is characterized in that, when the excitation light is incident on the phosphor unit, the phosphor unit emits light containing fluorescence obtained by converting the wavelength of the excitation light.

16. The light source device according to claim 15 ; a light modulation element that modulates light from the light source device into image light; a projection optical device that projects the image light.

Images