Light source device and projector

Abstract

To provide a light source device and a projector that can improve cooling efficiency and prevent an increase in size.SOLUTION: A light source device comprises: a housing; a phosphor wheel that has a phosphor and is arranged inside the housing; a wheel-side heat radiation unit that has a plurality of fins provided on the phosphor wheel, and generates an air flow circulating from the center to the outside of the phosphor wheel through the rotation of the phosphor wheel; a driving unit that rotates the phosphor wheel; a heat receiving member that has an installation part where the driving unit is installed and faces the wheel-side heat radiation unit; a heat sink that is connected with the heat receiving member on the opposite side of the phosphor wheel and is arranged outside the housing; and a plurality of columnar projections that are provided around the installation part and project inside the housing toward the plurality of fins. The dimensions along the projection direction of at least one columnar projection are larger than the dimensions in an orthogonal direction to the projection direction, and the columnar projections on the upstream side of the air flow disperse the air flow toward the other columnar projections on the downstream side.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Conventionally, a light source device is known that includes a phosphor wheel and a housing that houses the phosphor wheel, and dissipates heat generated in the phosphor wheel to the outside of the housing (see, for example, Patent Documents 1 and 2). In the light source device described in Patent Document 1, the phosphor wheel includes a circular wheel substrate, a phosphor layer provided on the surface of the wheel substrate, and a plurality of heat dissipation members provided on the back surface of the wheel substrate. Among the plurality of heat dissipation members, the heat dissipation performance of the heat dissipation member provided on the rotation center side of the wheel substrate is the highest, and the heat dissipation performance of the heat dissipation member decreases as the arrangement position moves away from the rotation center. The housing is provided with a plurality of concentric fins centered on the rotation center of the wheel substrate. The plurality of fins are arranged in a nested manner with the fins of the heat dissipation member. Then, the heat generated in the phosphor layer is transmitted to the plurality of heat dissipation members through the wheel substrate, and is transmitted to the fins by the fluid between the plurality of heat dissipation members and the fins, and is dissipated from the housing. The light source device described in Patent Document 2 includes a phosphor wheel, a phosphor wheel device housing, and a heat sink structure. The heat generated in the phosphor provided on the phosphor wheel contacts the heat sink structure by the air flow generated by the rotation of the phosphor wheel. As the air flow circulates along the fins of the heat sink structure, heat is transferred to the fins, and thereby the heat generated in the phosphor is discharged outside the phosphor wheel device housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the light source device described in Patent Document 1, when the wheel substrate rotates, heat is transferred from the heat dissipation member to the fins by Taylor vortices by a heat dissipation member provided concentrically around the rotation center of the wheel substrate. For this reason, unless the wheel substrate is rotated at a sufficiently high rotational speed, heat transfer from the heat dissipation member to the fins may not be performed efficiently. In addition, in the light source device described in Patent Document 2, since a heat sink structure is provided on each of a plurality of side surfaces of the housing, there is a problem that the light source device tends to be enlarged. For these reasons, there has been a demand for a configuration of a light source device that can increase the cooling efficiency and suppress the enlargement.

Means for Solving the Problems

[0005] The light source device according to the first aspect of the present disclosure includes a housing, a phosphor wheel having a phosphor that converts the wavelength of incident light and disposed in the housing, a plurality of fins provided on one surface of the phosphor wheel, and a wheel-side heat dissipation unit that generates an air flow flowing from the center side to the outside of the phosphor wheel by rotation of the phosphor wheel by the plurality of fins, a drive unit that rotates the phosphor wheel, an installation unit on which the drive unit is installed, a heat receiving member facing the wheel-side heat dissipation unit, a heat sink disposed outside the housing and heat-transferably connected to the heat receiving member on the side opposite to the phosphor wheel, and a plurality of columnar protrusions provided around the installation unit so as to be heat-transferable to the heat receiving member and protruding into the housing toward the plurality of fins. Among the plurality of columnar protrusions, the dimension along the protruding direction of at least one columnar protrusion is larger than the dimension in the direction orthogonal to the protruding direction of the at least one columnar protrusion, and among the plurality of columnar protrusions, the columnar protrusions disposed on the upstream side of the air flow flowing through the plurality of columnar protrusions disperse the air flow toward other columnar protrusions disposed on the downstream side of the air flow.

[0006] The light source device according to the second aspect of the present disclosure includes a housing, a phosphor that converts the wavelength of incident light, a phosphor wheel disposed in the housing, and a plurality of fins provided on one surface of the phosphor wheel. When the phosphor wheel rotates, a wheel-side heat radiating portion that generates an air flow flowing from the center side to the outside of the phosphor wheel by the plurality of fins, a driving portion that rotates the phosphor wheel, and a heat radiating member facing the wheel-side heat radiating portion. The heat radiating member includes an installation portion where the driving portion is installed, a heat sink provided on the opposite side of the installation portion from the phosphor wheel and disposed outside the housing, and a plurality of columnar protrusions provided around the installation portion and protruding into the housing toward the plurality of fins. Among the plurality of columnar protrusions, the dimension along the protruding direction of at least one columnar protrusion is larger than the dimension in the direction orthogonal to the protruding direction of the at least one columnar protrusion. Among the plurality of columnar protrusions, the columnar protrusions disposed on the upstream side of the air flow flowing through the plurality of columnar protrusions disperse the air flow toward the columnar protrusions disposed on the downstream side of the air flow.

[0007] The projector according to the third aspect of the present disclosure includes the light source device according to the first aspect or the second aspect, an image forming device that forms image light using the light emitted from the light source device, and a projection optical device that projects the image light formed by the image forming device.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

[0009] [First Embodiment] Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings. [Schematic Configuration of Projector] FIG. 1 is a schematic diagram showing the configuration of the projector 1 according to the present embodiment. The projector 1 according to the present embodiment modulates the light emitted from the light source device 4 to form an image according to the image information, and enlarges and projects the formed image onto a projection surface such as a screen. As shown in FIG. 1, the projector 1 includes an exterior housing 2 and an image projection device 3. In addition, although not shown, the projector 1 includes a power supply device that supplies power to the electronic components constituting the projector 1, a control device that controls the operation of the projector 1, and a cooling device that cools the cooling target constituting the projector 1.

[0010] [Configuration of Exterior Housing] The exterior housing 2 constitutes the exterior of the projector 1 and houses the image projection device 3, the power supply device, the control device, and the cooling device inside. The exterior housing 2 has a front portion 21, a rear portion 22, a left side portion 23, and a right side portion 24. Although not shown, the exterior housing 2 has a top surface portion that connects between one end portions of the respective surface portions 21 to 24, and a bottom surface portion that connects between the other end portions of the respective surface portions 21 to 24. The exterior housing 2 is formed, for example, in a substantially rectangular parallelepiped shape.

[0011] The right side portion 24 has an inlet 241. The inlet 241 introduces the air outside the exterior housing 2 into the interior of the exterior housing 2. A filter for collecting dust contained in the air passing through the inlet 241 may be provided at the inlet 241. The front portion 21 has a passage opening 211 located substantially at the center of the front portion 21. The light projected from the projection optical device 36 described later passes through the passage opening 211. The front portion 21 has an exhaust port 212 located on the left side portion 23 side of the front portion 21. The exhaust port 212 discharges the air that has cooled the object to be cooled provided inside the exterior housing 2 to the outside of the exterior housing 2.

[0012] In the following description, three directions orthogonal to each other are defined as the +X direction, the +Y direction, and the +Z direction. The +X direction is the direction from the left side portion 23 toward the right side portion 24. The +X direction is along the direction in which the light source device 4 described later in the image projection device 3 emits illumination light to the homogenizing device 31. The +Y direction is the direction from the bottom surface portion toward the top surface portion. The +Z direction is the direction from the rear portion 22 toward the front portion 21. The +Z direction is along the direction in which the projection optical device 36 described later in the image projection device 3 projects image light as viewed from the +Y direction. Although not shown, the opposite direction of the +X direction is defined as the -X direction, the opposite direction of the +Y direction is defined as the -Y direction, and the opposite direction of the +Z direction is defined as the -Z direction.

[0013] [Configuration of Image Projection Device] The image projection device 3 forms an image according to the image information input from the control device and projects the formed image. The image projection device 3 includes a light source device 4, a homogenizing device 31, a color separation device 32, a relay device 33, an image forming device 34, an optical component housing 35, and a projection optical device 36. The configuration of the light source device 4 will be described in detail later.

[0014] The homogenizing device 31 homogenizes the light emitted from the light source device 4. The homogenized light illuminates the modulation region of a light modulation device 343, which will be described later, via the color separation device 32 and the relay device 33. The homogenizing device 31 includes two lens arrays 311 and 312, a polarization conversion element 313, and a superimposing lens 314. The color separation device 32 separates the light incident from the homogenizing device 31 into red, green, and blue color lights. The color separation device 32 includes two dichroic mirrors 321 and 322, and a reflection mirror 323 that reflects the blue light separated by the dichroic mirror 321.

[0015] The relay device 33 is provided in the optical path of the red light, which is longer than the optical paths of the other color lights, and suppresses the loss of the red light. The relay device 33 includes an incident-side lens 331, relay lenses 333, and reflection mirrors 332 and 334. In this embodiment, the relay device 33 is provided in the optical path of the red light. However, the present invention is not limited to this, and for example, a color light whose optical path is longer than that of the other color lights may be the blue light, and the relay device 33 may be provided in the optical path of the blue light.

[0016] The image forming device 34 modulates the incident red, green, and blue color lights, synthesizes the modulated color lights, and forms an image. The image forming device 34 includes three field lenses 341 provided according to the incident color light, three incident-side polarizing plates 342, three light modulation devices 343, three viewing angle compensation plates 344, three exit-side polarizing plates 345, and one color combining section 346.

[0017] The light modulation device 343 modulates the light emitted from the light source device 4 according to the image information. The three light modulation devices 343 include a light modulation device 343R that modulates red light, a light modulation device 343G that modulates green light, and a light modulation device 343B that modulates blue light. The light modulation device 343 is composed of a transmissive liquid crystal panel, and a liquid crystal light valve is composed of an incident side polarizing plate 342, the light modulation device 343, and an exit side polarizing plate 345. The color combining unit 346 combines the three color lights modulated by the light modulation devices 343B, 343G, and 343R to form an image, and emits the formed image to the projection optical device 36. In the present embodiment, the color combining unit 346 is composed of a cross dichroic prism, but is not limited thereto, and for example, it can also be composed of a plurality of dichroic mirrors.

[0018] The optical component housing 35 houses each of the above-described devices 31 to 34 inside. In the image projection device 3, an illumination optical axis Ax, which is a design optical axis, is set, and the optical component housing 35 holds the devices 31 to 34 at predetermined positions on the illumination optical axis Ax. The light source device 4 and the projection optical device 36 are arranged at predetermined positions on the illumination optical axis Ax.

[0019] The projection optical device 36 is a projection lens that enlarges and projects the image incident from the image forming device 34 onto the projection surface. That is, the projection optical device 36 projects the light modulated by the light modulation device 343. Examples of the projection optical device 36 include a combined lens having a plurality of lenses and a cylindrical lens barrel in which the plurality of lenses are housed.

[0020] [Configuration of Light Source Device] FIG. 2 is a schematic diagram showing the light source device 4. The light source device 4 emits illumination light for illuminating the light modulation device 343 to the homogenizing device 31. As shown in FIG. 2, the light source device 4 includes a light source housing CA, a light source unit 40, an afocal optical element 41, a first phase difference element 42, a diffusing transmission element 43, a light separation and combination element 44, a second phase difference element 45, a first condensing element 46, a diffusing optical element 47, a second condensing element 48, a third phase difference element 49, and a wavelength conversion device 5A.

[0021] In the light source device 4, an illumination optical axis Ax1 extending linearly along the -Z direction and an illumination optical axis Ax2 orthogonal to the illumination optical axis Ax1 and extending linearly along the +X direction are set. The light source unit 40, the afocal optical element 41, the first phase difference element 42, the diffusion transmission element 43, the light separation / combination element 44, the second phase difference element 45, the first condenser lens 46, and the diffusion optical element 47 are arranged on the illumination optical axis Ax1. The wavelength conversion device 5A, the second condenser lens 48, the light separation / combination element 44, and the third phase difference element 49 are arranged on the illumination optical axis Ax2.

[0022] [Configuration of the light source housing] The light source housing CA corresponds to the housing. The light source housing CA houses the light source unit 40, the afocal optical element 41, the first phase difference element 42, the diffusion transmission element 43, the light separation / combination element 44, the second phase difference element 45, the first condenser lens 46, the diffusion optical element 47, the second condenser lens 48, the third phase difference element 49, and the wavelength conversion device 5A, and is a sealed housing in which dust and the like hardly enter. The light source housing CA has a housing space CA1 and an opening CA2. The housing space CA1 houses a part of the wavelength conversion device 5A. Specifically, the housing space CA1 houses the phosphor wheel 6, the heat dissipation part 7, the drive part 8, and the heat receiving member 92 of the heat dissipation member 9A. The opening CA2 is an opening for housing a part of the wavelength conversion device 5A in the housing space CA1, and is closed by the heat receiving member 92 of the heat dissipation member 9A. When the opening CA2 is closed by the heat dissipation member 9A, the housing space CA1 is sealed.

[0023] [Configuration of the light source unit] The light source unit 40 includes a light source 401 that emits blue light in the -Z direction and a plurality of collimator lenses 404. The light source 401 includes a plurality of solid light sources 402 and a support member 403. Each of the plurality of solid light sources 402 is composed of a semiconductor laser that emits blue light. Specifically, the solid light source 402 emits s-polarized blue light BLs in the +Z direction with respect to the optical separation and synthesis element 44. Note that the solid light source 402 may be configured to emit p-polarized blue light BLp with respect to the optical separation and synthesis element 44. The blue light emitted by the solid light source is, for example, laser light with a peak wavelength of 440 nm. The blue light emitted from the plurality of solid light sources 402 enters the collimator lens 404. The support member 403 supports a plurality of solid light sources 402 arranged in an array in a plane orthogonal to the illumination optical axis Ax1. The support member 403 is a metal member having thermal conductivity.

[0024] The plurality of collimator lenses 404 convert the blue light incident from the plurality of solid light sources 402 into parallel light beams. The blue light emitted from the plurality of collimator lenses 404 enters the afocal optical element 41. In this embodiment, the light source 401 is assumed to emit s-polarized blue light BLs. However, the present invention is not limited to this, and the light source 401 may emit p-polarized blue light BLp, or may emit blue light in which s-polarized light and p-polarized light are mixed. In the latter case, the first phase difference element 42 can be omitted.

[0025] [Configuration of afocal optical element] The afocal optical element 41 adjusts the beam diameter of the blue light BLs incident from the light source unit 40 in the -Z direction. The afocal optical element 41 is composed of a lens 411 that condenses the incident light and a lens 412 that collimates the light beam condensed by the lens 411. Note that the afocal optical element 41 may be omitted.

[0026] [Configuration of first phase difference element] The first phase difference element 42 is provided between the lens 411 and the lens 412. The first phase difference element 42 converts a part of the incident blue light BLs and emits light containing s-polarized blue light BLs and p-polarized blue light BLp. The first phase difference element 42 may be rotated about a rotation axis along the illumination optical axis Ax1 by a rotating device. In this case, the ratio of the s-polarized component to the p-polarized component in the blue light emitted from the first phase difference element 42 can be adjusted according to the rotation angle of the first phase difference element 42.

[0027] [Configuration of the diffusing transmission element] The diffusing transmission element 43 equalizes the illuminance distribution of the blue light BLp and BLs incident from the lens 412 in the -Z direction. Examples of the configuration of the diffusing transmission element 43 include a configuration having a hologram, a configuration in which a plurality of small lenses are arranged on a plane orthogonal to the optical axis, and a configuration in which the surface through which light passes is a rough surface. Note that instead of the diffusing transmission element 43, a homogenizer optical element having a pair of multi-lenses may be employed.

[0028] [Configuration of the optical separation and synthesis element] The blue light BLs and BLp that have passed through the diffusing transmission element 43 are incident on the optical separation and synthesis element 44. The optical separation and synthesis element 44 has a function as an optical separation element that separates incident light and a function as an optical synthesis element that synthesizes light incident from two directions. In other words, the optical separation and synthesis element 44 functions as an optical separation element and also functions as an optical synthesis element. The optical separation and synthesis element 44 is a polarization beam splitter that separates the s-polarized component and the p-polarized component contained in the incident light. Specifically, the optical separation and synthesis element 44 reflects the s-polarized component and transmits the p-polarized component. Further, the optical separation and synthesis element 44 has a color separation characteristic of transmitting light having a predetermined wavelength or longer for any polarized component of the s-polarized component and the p-polarized component. Therefore, among the blue light BLp and BLs incident from the diffusing transmission element 43 to the optical separation and synthesis element 44, the p-polarized blue light BLp passes through the optical separation and synthesis element 44 in the -Z direction and is incident on the second phase difference element 45. On the other hand, the s-polarized blue light BLs is reflected in the -X direction by the optical separation and synthesis element 44 and is incident on the second condenser lens 48. Note that the optical separation and combination element 44 may have the function of a half mirror that allows part of the light incident from the light source unit 40 through the diffusion transmission element 43 to pass through and reflects the remaining light, and the function of a dichroic mirror that reflects the blue light incident from the diffusion optical element 47, transmits the light incident from the wavelength conversion device 5A and having a wavelength longer than that of the blue light. In this case, the first retardation element 42 can be omitted.

[0029] [Configuration of the second retardation element] The second retardation element 45 is arranged in the -Z direction with respect to the optical separation and combination element 44. That is, the second retardation element 45 is arranged between the optical separation and combination element 44 and the first condenser element 46. The second retardation element 45 converts the blue light BLp that has passed through the optical separation and combination element 44 into circularly polarized blue light BLc. The blue light BLc that has passed through the second retardation element 45 in the -Z direction is incident on the first condenser element 46.

[0030] [Configuration of the first condenser element] The first condenser element 46 condenses the blue light BLc that has passed through the optical separation and combination element 44 in the -Z direction and is incident from the second retardation element 45 onto the diffusion optical element 47. Also, the first condenser element 46 collimates the light incident from the diffusion optical element 47 in the +Z direction and emits it to the second retardation element 45. In the present embodiment, the first condenser element 46 is composed of three lenses 461, 462, and 463, but the number of lenses constituting the first condenser element 46 is not limited.

[0031] [Configuration of the diffusion optical element] The diffusion optical element 47 diffuses the incident blue light BLc at the same diffusion angle as the fluorescence YL emitted from the wavelength conversion device 5A. Specifically, the diffusion optical element 47 reflects and diffuses the blue light BLc incident from the first condenser element 46 in the -Z direction in the +Z direction. The diffusion optical element 47 is a reflection element that Lambert reflects the incident blue light BLc. Note that the diffusion optical element 47 may be rotated about a rotation axis parallel to the illumination optical axis Ax1 by a rotation device. The blue light BLc diffused by the diffusion optical element 47 enters the second retardation element 45 after passing through the first condensing element 46. When the blue light BLc incident on the diffusion optical element 47 is reflected by the diffusion optical element 47, it is converted into circularly polarized light with the opposite rotation direction. Therefore, the blue light BLc incident on the second retardation element 45 through the first condensing element 46 is converted into s-polarized blue light BLs by the second retardation element 45. Then, the blue light BLs is reflected in the +X direction by the optical separation and synthesis element 44 and enters the third retardation element 49.

[0032] [Configuration of the Second Condensing Element] The second condensing element 48 condenses the blue light BLs reflected in the -X direction by the optical separation and synthesis element 44 onto the wavelength conversion device 5A. Also, the second condensing element 48 collimates the fluorescence YL incident from the wavelength conversion device 5A in the +X direction and emits the collimated fluorescence YL to the optical separation and synthesis element 44. In the present embodiment, the second condensing element 48 is composed of three lenses 481, 482, and 483, but the number of lenses constituting the second condensing element 48 is not limited.

[0033] [Schematic Configuration of the Wavelength Conversion Device] The wavelength conversion device 5A converts the wavelength of the blue light BLs incident from the second condensing element 48. That is, the wavelength conversion device 5A emits fluorescence YL having a wavelength longer than the wavelength of the incident blue light BLs. More specifically, the wavelength conversion device 5A is a reflection-type wavelength conversion element that emits fluorescence YL on the incident side of the blue light BLs. The blue light BLs incident on the wavelength conversion device 5A corresponds to excitation light or light in the first wavelength band, and the fluorescence YL corresponds to converted light or light in the second wavelength band. The configuration of the wavelength conversion device 5A will be described in detail later. The fluorescent light YL emitted from the wavelength conversion device 5A in the +X direction is collimated by the second condenser 48 and then enters the optical separation and synthesis element 44. As described above, since the optical separation and synthesis element 44 has the property of transmitting the fluorescent light YL, the fluorescent light YL incident on the optical separation and synthesis element 44 along the +X direction passes through the optical separation and synthesis element 44 and enters the third retardation element 49. That is, the light incident on the third retardation element 49 from the optical separation and synthesis element 44 is white light in which the blue light BLs and the fluorescent light YL are mixed.

[0034] [Configuration of the Third Retardation Element] The third retardation element 49 converts the white light including the blue light BLs and the fluorescent light YL incident from the optical separation and synthesis element 44 into white light in which s-polarized light and p-polarized light are mixed. The white light thus converted is emitted in the +X direction as illumination light LT and enters the above-described homogenizing device 31.

[0035] [Detailed Configuration of the Wavelength Conversion Device] As shown in FIG. 2, the wavelength conversion device 5A includes a phosphor wheel 6, a heat radiating part 7, a driving part 8, and a heat radiating member 9A. Among these, the phosphor wheel 6, the heat radiating part 7, the driving part 8, and a part of the heat radiating member 9A are arranged in the accommodation space CA1. In the following description, the blue light BLs incident on the wavelength conversion device 5A from the second condenser 48 is referred to as excitation light.

[0036] [Configuration of the Phosphor Wheel] FIG. 3 is a plan view of the phosphor wheel 6 as viewed from the excitation light incident side. The phosphor wheel 6 is arranged on the second condenser 48 side with respect to the driving part 8 and is rotated by the driving part 8 about a rotation axis Rx substantially parallel to the illumination optical axis Ax2. As shown in FIG. 3, the phosphor wheel 6 is a wavelength conversion element including a phosphor layer 61, a reflection layer 62, and a support substrate 63. The phosphor layer 61 converts the wavelength of the incident excitation light. The phosphor layer 61 contains phosphor particles that are excited when the excitation light is incident and emit fluorescence YL having a wavelength longer than that of the incident excitation light. That is, the phosphor layer 61 corresponds to the phosphor. The fluorescence YL is, for example, light having a peak wavelength of 500 to 700 nm. That is, the fluorescence YL includes green light and red light. The phosphor layer 61 is formed in a ring shape centered on the rotation axis Rx of the support substrate 63 when viewed from the incident side of the excitation light. The reflective layer 62 is provided between the phosphor layer 61 and the support substrate 63. The reflective layer 62 reflects the light incident from the phosphor layer 61. Note that the reflective layer 62 may be the first surface 63A of the support substrate 63.

[0037] The support substrate 63 is a disk-shaped substrate that supports the phosphor layer 61 and the reflective layer 62. The support substrate 63 has a first surface 63A that is the surface on the incident side of the excitation light, and a fitting hole 631 provided at the center of the support substrate 63. The phosphor layer 61 and the reflective layer 62 are disposed on the first surface 63A. That is, the first surface 63A is a surface that supports the phosphor layer 61 and the reflective layer 62. A part of the driving unit 8 is fitted into the fitting hole 631 from the side opposite to the incident side of the excitation light. The support substrate 63 is rotated about the rotation axis Rx by the driving unit 8.

[0038] FIG. 4 is a plan view of the phosphor wheel 6 and the heat dissipation unit 7 as viewed from the side opposite to the incident side of the excitation light. In FIG. 4, for the sake of clarity, only some of the fins 72 and some of the groove portions 73 of the heat dissipation unit 7 are labeled. As shown in FIG. 4, the support substrate 63 has a second surface 63B that is the surface opposite to the first surface 63A, and a connection portion 632. The connection portion 632 is a central portion on the second surface 63B. A part of the driving unit 8 is connected to the connection portion 632.

[0039] [Configuration of the heat dissipation unit] The heat radiating portion 7 corresponds to the wheel side heat radiating portion. The heat radiating portion 7 is provided in a ring shape outside the connecting portion 632 on the second surface 63B. The heat radiating portion 7 is connected to the second surface 63B of the support substrate 63 so as to be heat transferable, and radiates the heat transmitted from the phosphor layer 61 through the support substrate 63. Specifically, the heat radiating portion 7 transfers the heat transmitted from the phosphor layer 61 to the gas flowing due to the rotation of the phosphor wheel 6, thereby cooling the phosphor layer 61.

[0040] The heat radiating portion 7 includes a heat transfer substrate 71, a plurality of fins 72, and a plurality of groove portions 73 provided between the plurality of fins 72. The heat transfer substrate 71 is a ring-shaped substrate and is formed of a metal having high thermal conductivity such as aluminum. The heat transfer substrate 71 is attached outside the connecting portion 632 on the second surface 63B and transfers the heat transmitted from the second surface 63B to the plurality of fins 72. The plurality of fins 72 stand up from the heat transfer substrate 71 on the side opposite to the incident side of the excitation light with respect to the wavelength conversion device 5A. The plurality of fins 72 are arranged at substantially equal intervals along the +D1 direction which is the rotation direction of the phosphor wheel 6. That is, each fin 72 extends in an arc shape from a base point BP set at substantially equal intervals along the +D1 direction at a portion on the inner edge 7S side of the heat transfer substrate 71 toward the outer edge 7T of the heat transfer substrate 71. Specifically, the plurality of fins 72 extend in an arc shape in the -D1 direction which is the direction opposite to the +D1 direction from the base point BP toward the outer edge 7T.

[0041] When the phosphor wheel 6 having such a heat radiating portion 7 is rotated by the driving portion 8, an air flow is generated that flows through the groove portion 73 from the center side to the outside of the second surface 63B. When the air flow flows through the groove portion 73, the air flow contacts the fins 72 that sandwich the groove portion 73 in the +D1 direction, and heat is transferred from the fins 72 to the air flow. Thereby, the fins 72 are cooled, and thus the phosphor layer 61 is cooled. Note that, as will be described in detail later, the air flow generated by rotating the phosphor wheel 6 flows through the heat radiating member 9A provided at a position facing the plurality of fins 72. Thereby, the heat of the air flow is transmitted to the heat radiating member 9A, and the heat transmitted to the heat radiating member 9A is radiated outside the light source housing CA.

[0042] [Configuration of drive unit] The drive unit 8 rotates the support substrate 63 about the rotation axis Rx in the +D1 direction, thereby rotating the phosphor wheel 6 in the +D1 direction. The drive unit 8 includes a rotating portion 81 that rotates about the rotation axis Rx and a main body portion 82 that rotates the rotating portion 81. The rotating portion 81 is disposed on the incident side of the excitation light with respect to the wavelength conversion device 5A with respect to the main body portion 82. As shown in FIG. 3, the rotating portion 81 is fixed to the support substrate 63 in a state where a part of the rotating portion 81 is fitted into the fitting hole 631. The main body portion 82 includes a motor that rotates the rotating portion 81. The main body portion 82 is installed on the heat radiating member 9A. By rotating the phosphor wheel 6 by such a drive unit 8, continuous incidence of excitation light on one point in the phosphor layer 61 is prevented. Thereby, a decrease in the wavelength conversion efficiency in the phosphor layer 61 is suppressed, and the phosphor wheel 6 is cooled by the air flow generated by the rotation of the phosphor wheel 6.

[0043] [Configuration of heat radiating member] FIG. 5 is a perspective view showing the heat radiating member 9A. The heat radiating member 9A receives the heat generated in the phosphor layer 61 through the air flow generated by the rotation of the phosphor wheel 6, and radiates the received heat outside the light source housing CA. The heat radiating member 9A is disposed at a position facing the heat radiating portion 7 in the light source housing CA. That is, the heat radiating member 9A is disposed on the side opposite to the incident side of the excitation light with respect to the phosphor wheel 6 and the heat radiating portion 7, and is fixed at a position closing the above-described opening CA2. As shown in FIG. 5, the heat radiating member 9A includes a heat sink 91, a heat receiving member 92, and a plurality of columnar protrusions 93A. The heat receiving member 92 and the plurality of columnar protrusions 93A may be integrally formed by integral molding, or all of the heat sink 91, the heat receiving member 92, and the plurality of columnar protrusions 93A may be integrally formed by integral molding. Alternatively, they may be integrally formed by connecting the heat sink 91, the heat receiving member 92, and the plurality of columnar protrusions 93A.

[0044] [Configuration of Heat Sink] The heat sink 91 corresponds to the heat radiating portion on the heat radiating member side and radiates the heat transmitted through the heat receiving member 92. The heat sink 91 is disposed outside the light source housing CA when the wavelength conversion device 5A is attached to the light source housing CA. Therefore, the heat transmitted to the heat sink 91 through the heat receiving member 92 is radiated outside the light source housing CA. Although not shown, a fan FN constituting the above-described cooling device is provided outside the light source housing CA, and the cooling gas in the exterior housing 2 circulates through the heat sink 91 by the fan FN. The cooling gas to which heat has been transferred from the heat sink 91 is discharged to the outside of the exterior housing 2 through the exhaust port 212 described above.

[0045] [Configuration of Heat Receiving Member] FIG. 6 is a plan view of the heat radiating member 9A as viewed from the incident side of the excitation light with respect to the wavelength conversion device 5A. The heat receiving member 92 is a substantially rectangular plate-like body and corresponds to the heat receiving member. As shown in FIG. 2, the heat receiving member 92 closes the opening CA2 and substantially seals the accommodation space CA1. The heat receiving member 92 receives the heat of the air flow generated by the rotation of the phosphor wheel 6 and transmits the received heat to the heat sink 91. As shown in FIGS. 5 and 6, the heat receiving member 92 includes an installation portion 921 and a wiring arrangement portion 922 disposed on the surface 92A on the heat radiating portion 7 side of the heat receiving member 92.

[0046] As shown in FIGS. 5 and 6, the installation portion 921 is provided substantially at the center of the surface 92A on the phosphor wheel 6 side in the heat receiving member 92. The main body portion 82 of the drive portion 8 is installed in the installation portion 921. More specifically, the installation portion 921 is a substantially circular concave portion that is concave on the side opposite to the phosphor wheel 6, and the main body portion 82 is installed by being fitted into the installation portion 921. The wiring arrangement portion 922 is a flat portion that extends from the installation portion 921 along one direction to the outside of the heat receiving member 92 from the installation portion 921. A wiring FPC connected to the drive portion 8 disposed in the installation portion 921 is disposed in the wiring arrangement portion 922. In the present embodiment, the wiring FPC is constituted by a flexible printed circuit board, but other wiring constituent members such as a cable may be used.

[0047] [Configuration of Columnar Projections] Airflow generated as the phosphor wheel 6 rotates flows through the plurality of columnar projections 93A, and the plurality of columnar projections 93A transfer heat received from the flowing airflow to the heat receiving member 92. The plurality of columnar projections 93A are provided around the installation portion 921 so as to be heat transferable with the heat receiving member 92. More specifically, the plurality of columnar projections 93A are provided at positions around the installation portion 921 on the surface 92A and avoiding the wiring arrangement portion 922. That is, the plurality of columnar projections 93A are provided at portions of the surface 92A of the heat receiving member 92 excluding the wiring arrangement portion 922. The plurality of columnar projections 93A protrude into the light source housing CA from the surface 92A toward the plurality of fins 72 of the heat radiating portion 7. In the present embodiment, the plurality of columnar projections 93A stand up in a substantially frustum shape from the surface 92A.

[0048] More specifically, the plurality of columnar projections 93A are provided on concentric circles centered on the installation portion 921. In the present embodiment, a plurality of reference circles CR1, CR2, CR3, which are concentric circles centered on the installation portion 921 and set at substantially equal intervals, are set on the surface 92A, and the plurality of columnar projections 93A are arranged on the plurality of reference circles CR1, CR2, CR3. The reference circles CR1 to CR3 are virtual concentric circles, the innermost reference circle is the reference circle CR1, and the outermost reference circle is the reference circle CR3. The plurality of columnar protrusions 93A are provided at equal intervals in the +D2 direction, which is the circumferential direction centered on the installation portion 921, in each of the reference circles CR1 to CR3. Specifically, the plurality of columnar protrusions 93A are provided on each of the reference circles CR1 to CR3 at 30° intervals in the +D2 direction.

[0049] And the phase of the arrangement period of the columnar protrusions 93A in the odd-numbered reference circles CR1 and CR3 is shifted from the phase of the arrangement period of the columnar protrusions 93A in the even-numbered reference circle CR2. In the present embodiment, when a virtual straight line connecting the installation portion 921 (for example, the center CT of the installation portion 921) and one of the plurality of columnar protrusions 93A arranged on the reference circle CR1 is defined as the reference line SL1, in the odd-numbered reference circles CR1 and CR3, they are provided at 20° intervals in the +D2 direction from the reference line SL1. Similarly, when a virtual straight line connecting the installation portion 921 (for example, the center CT of the installation portion 921) and one of the plurality of columnar protrusions 93A arranged on the reference circle CR2 is defined as the reference line SL2, in the even-numbered reference circle CR2, they are provided at 20° intervals in the +D2 direction from the reference line SL2. And the intersection angle α between the reference line SL1 and the reference line SL2 closest to the reference line SL1 in the +D2 direction is 10°. Thus, in the present embodiment, the plurality of columnar protrusions 93A have the phases of the arrangement periods of the columnar protrusions 93A shifted from each other between the odd-numbered reference circles and the even-numbered reference circles. In this way, by shifting the phases, the airflow flowing along the surface 92A can be made to easily collide with the columnar protrusions 93A, and the heat of the airflow can be easily transferred to the columnar protrusions 93A. Note that the outer diameter of each of the plurality of columnar protrusions 93A is the same in the reference circles CR1 to CR3 where the columnar protrusions 93A are provided. Also, although not shown, in the present embodiment, the height dimension of the columnar protrusion 93A in the standing direction in which the columnar protrusion 93A stands up from the surface 92A is more than twice the outer diameter of the columnar protrusion 93A.

[0050] Such a plurality of columnar protrusions 93A can be said to include a plurality of first columnar protrusions arranged on the installation portion 921 side as viewed from the phosphor wheel 6, and a plurality of second columnar protrusions arranged outside the plurality of first columnar protrusions as viewed from the phosphor wheel 6. As the plurality of first columnar protrusions, a plurality of columnar protrusions 93A arranged on a reference circle CR1 set on the installation portion 921 side can be exemplified, and as the plurality of second columnar protrusions, a plurality of columnar protrusions 93A arranged on reference circles CR2 and CR3 set outside the installation portion 921 than the reference circle CR1 can be exemplified.

[0051] [Airflow generated during rotation of the phosphor wheel in the accommodation space] FIG. 7 is a schematic diagram showing an airflow AF in the accommodation space CA1 of the light source housing CA. The airflow AF generated during the rotation of the phosphor wheel 6 by the drive unit 8 will be described. When the phosphor wheel 6 is rotated, as shown in FIG. 7, an airflow is generated by a plurality of fins 72 constituting the heat radiating portion 7 provided on the side opposite to the incident side of the excitation light with respect to the phosphor wheel 6. Among the airflows generated by the plurality of fins 72, the main airflow is the airflow AF mainly directed from the center of the phosphor wheel 6 toward the outside, and the other airflow is an airflow (not shown) directed from the phosphor wheel 6 toward the heat radiating member 9A. The airflow AF flows from the center of the phosphor wheel 6 toward the outside along the plurality of groove portions 73 while heat is transferred from the plurality of fins 72. The airflow AF corresponds to the first airflow.

[0052] The air flow AF1 collides with the inner wall CA11 that intersects the flow direction of the air flow AF1 among the inner walls constituting the accommodation space CA1, and flows along the inner wall CA11 toward the heat receiving member 92. The air flow AF that has flowed toward the heat receiving member 92 flows from the outside to the center of the heat receiving member 92 along the surface 92A of the heat receiving member 92. At this time, since a plurality of columnar protrusions 93A are arranged on the surface 92A, the air flow AF flowing along the surface 92A collides with the plurality of columnar protrusions 93A and flows toward the installation portion 921 arranged at the center of the surface 92A. Then, the air flow AF flows along the driving portion 8 located in the installation portion 921 toward the phosphor wheel 6 side, and flows to the center of the second surface 63B of the support substrate 63 constituting the phosphor wheel 6. After that, the air flow AF is circulated again from the center to the outside of the phosphor wheel 6 along the plurality of grooves 73 by the plurality of fins 72.

[0053] FIG. 8 is a schematic diagram showing the air flow AF that has collided with one columnar protrusion 93A. Here, as shown in FIG. 8, the air flow AF that has collided with one columnar protrusion 93A among the plurality of columnar protrusions 93A branches into two and flows toward other columnar protrusions 93A. That is, the columnar protrusion 93A disperses the air flow AF1 (the first air flow) flowing through the columnar protrusion 93A among the air flows AF (the first air flow) generated as the phosphor wheel 6 rotates into a plurality of air flows AF2 (the second air flow) flowing toward other columnar protrusions 93A. Thereby, since it is possible to easily circulate the air flow AF through each of the plurality of columnar protrusions 93A, heat exchange between each columnar protrusion 93A and the air flow AF can be promoted, and heat can be easily transferred from the air flow AF to the columnar protrusion 93A.

[0054] Further, as shown in FIG. 8, when the columnar protrusion 93A disperses the airflow AF1 flowing through the columnar protrusion 93A to the airflow AF2 flowing through the other columnar protrusions 93A, the columnar protrusion 93A generates an airflow AF2 that is drawn in on the surface opposite to the surface where the airflow collides. That is, turbulent flow is generated on the side opposite to the collision side of the airflow AF1 in each columnar protrusion 93A. Thereby, since the contact area with the airflow can be increased in the columnar protrusion 93A, heat exchange between the columnar protrusion 93A and the airflow AF can be promoted, and heat can be easily transferred from the airflow AF to the columnar protrusion 93A. Thus, the heat transferred to the columnar protrusion 93A is transferred to the heat sink 91 via the heat receiving member 92 as described above. Then, since the heat transferred to the heat sink 91 is radiated outside the light source housing CA, the temperature in the accommodation space CA1, that is, the temperature of the gas flowing through the heat radiating portion 7 provided on the phosphor wheel 6 can be lowered.

[0055] In addition, in order for the airflow generated when the phosphor wheel 6 rotates to efficiently flow toward the heat receiving member 92 side after colliding with the inner wall CA11 of the accommodation space CA1 and circulate the airflow in the accommodation space CA1, the distance from the inner wall CA11 of the accommodation space CA1 to the outer periphery of the plurality of fins 72 provided on the phosphor wheel 6 is preferably a predetermined distance. According to the research results by the inventor of the present case, the distance from the rotation axis Rx of the phosphor wheel 6 to the outer edge of the fin 72 is preferably 10% or more and 30% or less of the distance from the rotation axis Rx to the inner wall CA11. By including the distance from the rotation axis Rx to the outer edge of the fin 72 within such a range, the airflow AF can be efficiently circulated between the heat radiating portion 7, which is the wheel-side heat radiating portion, and the heat radiating member 9A.

[0056] [Effects of the First Embodiment] The projector 1 according to the present embodiment described above has the following effects. The projector 1 includes a light source device 4, an image forming device 34 that forms image light using the light emitted from the light source device 4, and a projection optical device 36 that projects the image light formed by the image forming device 34. The light source device 4 includes a light source housing CA, a phosphor wheel 6, a heat radiating part 7, a driving part 8, a heat sink 91, a heat receiving member 92, and a plurality of columnar protrusions 93A. The light source housing CA corresponds to a housing. The phosphor wheel 6 has a phosphor layer 61 that converts the wavelength of incident light, and is disposed in the accommodation space CA1 of the light source housing CA. The phosphor layer 61 corresponds to a phosphor. The heat radiating part 7 corresponds to a wheel-side heat radiating part. The heat radiating part 7 has a plurality of fins 72 provided on the second surface 63B of the support substrate 63 of the phosphor wheel 6. The second surface 63B corresponds to one surface of the phosphor wheel 6. The heat radiating part 7 generates an air flow that circulates from the center side to the outside of the phosphor wheel 6 by the rotation of the phosphor wheel 6 by means of the plurality of fins 72. The driving part 8 rotates the phosphor wheel 6. The heat receiving member 92 has an installation part 921 where the driving part 8 is installed. The heat receiving member 92 is disposed at a position facing the heat radiating part 7. The heat receiving member 92 corresponds to a heat receiving member. The heat sink 91 is heat-transferably connected to the heat receiving member 92 on the side opposite to the phosphor wheel 6. The heat sink 91 is disposed outside the light source housing CA. The plurality of columnar protrusions 93A are provided around the installation part 921 in a heat-transferable manner. The plurality of columnar protrusions 93A project into the accommodation space CA1 of the light source housing CA toward the plurality of fins 72. In each of the plurality of columnar protrusions 93A, the dimension along the protruding direction is larger than the dimension in the direction orthogonal to the protruding direction. Among the plurality of columnar protrusions 93A, the columnar protrusions 93A disposed on the upstream side of the air flow flowing through the plurality of columnar protrusions 93A disperse the air flow toward the other columnar protrusions 93A disposed on the downstream side of the air flow.

[0057] According to such a configuration, when the phosphor wheel 6 is rotated by the driving part 8, an air flow from the center to the outside of the phosphor wheel 6 is generated by the plurality of fins 72 of the heat radiating part 7. At this time, since the heat of the phosphor wheel 6, that is, the heat generated in the phosphor layer 61, is transferred from the plurality of fins 72 to the air flow, the phosphor layer 61 can be cooled. In addition, in the heat receiving member 92 disposed at a position facing the heat radiating portion 7, an air flow generated by the rotation of the phosphor wheel 6 circulates. Around the installation portion 921 of the heat receiving member 92, a plurality of columnar protrusions 93A protruding into the light source housing CA toward the plurality of fins 72 are provided. Since the plurality of columnar protrusions 93A are connected to the heat receiving member 92 in a heat transferable manner, the heat received by the plurality of columnar protrusions 93A is transferred to the heat sink 91 via the heat receiving member 92 and radiated to the outside of the light source housing CA. Thereby, the temperature in the accommodation space CA1 of the light source housing CA can be reduced, and the temperature of the air flow flowing through the plurality of fins 72 can be lowered, so that the cooling efficiency of the phosphor layer 61 of the phosphor wheel 6 can be enhanced. Furthermore, the heat receiving member 92 is disposed at a position facing the heat radiating portion 7. The plurality of columnar protrusions 93A connected to the heat sink 91 in a heat transferable manner via the heat receiving member 92 protrude toward the plurality of fins 72. The heat sink 91 is connected to the heat receiving member 92 in a heat transferable manner on the side opposite to the phosphor wheel 6. Therefore, it is possible to reduce the configuration protruding outside the light source housing CA other than the heat sink 91. Thereby, compared with the configuration in which heat sinks are provided on each of the plurality of side surfaces of the light source housing CA, the increase in size of the light source device 4 can be suppressed. Therefore, it is possible to improve the cooling efficiency of the light source device 4 and suppress the increase in size.

[0058] In the light source device 4, each of the plurality of columnar protrusions 93A generates a turbulent flow (air flow AF3) that collides with the surface on the side opposite to the surface with which the air flow collides against the columnar protrusion 93A. According to such a configuration, in the columnar protrusion 93A, the contact area with the air flow that has passed through the heat radiating portion 7 and is heated can be increased. Therefore, the heat transfer of the air flow to the columnar protrusion 93A can be promoted, and the cooling efficiency of the phosphor layer 61 can be enhanced.

[0059] In the light source device 4, the heat receiving member 92 has a wiring arrangement portion 922 where the wiring FPC connected to the driving portion 8 is disposed. The plurality of columnar protrusions 93A are provided in a portion of the surface 92A of the heat receiving member 92 excluding the wiring arrangement portion 922. According to such a configuration, it is possible to suppress the wiring FPC connected to the drive unit 8 from coming into contact with the columnar protrusions 93A through which the heat of the phosphor layer 61 is transmitted via the air flow. Therefore, it is possible to suppress the heat from affecting the wiring FPC and the drive unit 8.

[0060] The light source device 4 includes a light source housing CA, a phosphor wheel 6, a heat radiating unit 7, a drive unit 8, and a heat radiating member 9A. The light source housing CA corresponds to the housing. The phosphor wheel 6 has a phosphor layer 61 that converts the wavelength of incident light. The phosphor layer 61 corresponds to the phosphor. The phosphor wheel 6 is disposed within the accommodation space CA1 of the light source housing CA. The heat radiating unit 7 corresponds to the wheel-side heat radiating unit. The heat radiating unit 7 has a plurality of fins 72 provided on the second surface 63B of the support substrate 63 included in the phosphor wheel 6. The second surface 63B corresponds to one surface of the phosphor wheel 6. The heat radiating unit 7 generates an air flow that circulates from the center side to the outside of the phosphor wheel 6 by means of the plurality of fins 72 as the phosphor wheel 6 rotates. The drive unit 8 rotates the phosphor wheel 6. The heat radiating member 9A faces the heat radiating unit 7. The heat radiating member 9A includes an installation portion 921, a heat sink 91, and a plurality of columnar protrusions 93A. The installation portion 921 is where the drive unit 8 is installed. The heat sink 91 is provided on the side opposite to the phosphor wheel 6 with respect to the installation portion 921 and is disposed outside the light source housing CA. The plurality of columnar protrusions 93A are provided around the installation portion 921 and protrude into the accommodation space CA1 of the light source housing CA toward the plurality of fins 72. In the plurality of columnar protrusions 93A, the dimension along the protruding direction is larger than the dimension in the direction orthogonal to the protruding direction. Among the plurality of columnar protrusions 93A, the columnar protrusions 93A disposed on the upstream side of the air flow flowing through the plurality of columnar protrusions 93A disperse the air flow toward the columnar protrusions 93A disposed on the downstream side of the air flow. According to such a configuration, the above-described effects can be achieved.

[0061] [Second Embodiment] Next, a second embodiment of the present disclosure will be described. The projector according to this embodiment has the same configuration as the projector 1 according to the first embodiment, but the configuration of a plurality of columnar protrusions provided on the heat-receiving member constituting the heat-radiating member is different. In the following description, parts that are the same as or substantially the same as the parts already described are denoted by the same reference numerals and the description thereof is omitted.

[0062] [Schematic Configuration of Projector and Light Source Device] FIG. 9 is a plan view of the heat-radiating member 9B of the light source device included in the projector according to this embodiment, as viewed from the excitation light incident side. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it includes the wavelength conversion device 5B shown in FIG. 9 instead of the wavelength conversion device 5A according to the first embodiment. That is, the light source device according to this embodiment has the same configuration and functions as the light source device 4 according to the first embodiment, except that it includes the wavelength conversion device 5B instead of the wavelength conversion device 5A. The wavelength conversion device 5B has the same configuration and functions as the wavelength conversion device 5A, except that it includes the heat-radiating member 9B instead of the heat-radiating member 9A. That is, the wavelength conversion device 5B includes a phosphor wheel 6, a heat-radiating part 7, a driving part 8, and a heat-radiating member 9B.

[0063] [Configuration of Heat-Radiating Member] The heat-radiating member 9B includes a heat sink 91, a heat-receiving member 92, and a plurality of columnar protrusions 93A, in the same manner as the heat-radiating member 9A according to the first embodiment. However, in the heat-radiating member 9B, as shown in FIG. 9, the arrangement of the plurality of columnar protrusions 93A is different from the arrangement of the plurality of columnar protrusions 93A in the heat-radiating member 9A.

[0064] Specifically, in the heat dissipation member 9B, similar to the plurality of columnar protrusions 93A according to the first embodiment, the plurality of columnar protrusions 93A are provided around the installation portion 921 so as to be heat-transferable with the surface 92A of the heat receiving member 92, and protrude into the accommodation space CA1 of the light source housing CA toward the plurality of fins 72 of the heat dissipation portion 7. Then, in the accommodation space CA1, the plurality of columnar protrusions 93A are heated by the air flow AF generated by the plurality of fins 72 as the phosphor wheel 6 rotates, and the heat received is transmitted to the heat sink 91 via the heat receiving member 92. In the heat dissipation member 9B, a plurality of reference circles CR1 to CR6, which are substantially equally spaced concentric circles centered on the installation portion 921, are set on the surface 92A. The reference circles CR1 to CR6 are virtual concentric circles, and the reference circles CR1, CR2, CR3, CR4, CR5, and CR6 are set in this order from the installation portion 921 toward the outside.

[0065] The plurality of columnar protrusions 93A are provided at equal intervals in the circumferential direction (+D2 direction) centered on the installation portion 921 on each of the reference circles CR1 to CR6. Specifically, the columnar protrusions 93A1 arranged on the reference circles CR1 to CR3 on the installation portion 921 side are provided at every first angle centered on the installation portion 921. In this embodiment, the first angle is 30°, and the columnar protrusions 93A arranged on the reference circles CR1 to CR3 are the first columnar protrusions 93A1. Note that the arrangement period of the first columnar protrusions 93A1 arranged on the reference circles CR1 and CR3 and the arrangement period of the first columnar protrusions 93A1 arranged on the reference circle CR2 are shifted in phase by 15°. This phase shift angle is half of the arrangement angle of the first columnar protrusions 93A1 centered on the installation portion 921 on each of the reference circles CR1 to CR3. The first angle is the angle formed by a straight line connecting the center of the reference circles CR1 to CR3, which is also the center of the installation portion 921, and one first columnar protrusion 93A1, and a straight line connecting the center of the reference circles CR1 to CR3 and a first columnar protrusion 93A1 adjacent to the one first columnar protrusion 93A1.

[0066] The columnar protrusions 93A disposed on the reference circles CR4 to CR6 outside the installation portion 921 are provided at every second angle centered on the installation portion 921. In the present embodiment, the second angle is 15°, and the columnar protrusions 93A disposed on the reference circles CR4 to CR6 are the second columnar protrusions 93A2. Note that in the arrangement period of the second columnar protrusions 93A2 disposed on the reference circles CR4 to CR6, the phases are the same. The second angle is the angle formed by a straight line connecting the center of the reference circles CR4 to CR6, which is also the center of the installation portion 921, and one second columnar protrusion 93A2, and a straight line connecting the center of the reference circles CR4 to CR6 and a second columnar protrusion 93A2 adjacent to the one second columnar protrusion 93A2.

[0067] As described above, in the wavelength conversion device 5B, the plurality of columnar protrusions 93A include a plurality of first columnar protrusions 93A1 disposed on the installation portion 921 side as viewed from the phosphor wheel 6, and a plurality of second columnar protrusions 93A2 disposed outside the plurality of first columnar protrusions 93A1 as viewed from the phosphor wheel 6. The angle (first angle) at which the first columnar protrusions 93A1 are disposed around the installation portion 921 is different from the angle (second angle) at which the second columnar protrusions 93A2 are disposed around the installation portion 921. More specifically, the second angle is smaller than the first angle.

[0068] FIG. 10 is a diagram schematically showing a cross section of the wavelength conversion device 5B. In other words, FIG. 10 is a schematic diagram showing the air flow AF in the accommodation space CA1. Note that the plurality of second columnar protrusions 93A2 are provided according to the region where the phosphor layer 61 of the phosphor wheel 6 is provided, as shown in FIG. 10. More specifically, when the wavelength conversion device 5B is viewed from the excitation light incident side, the plurality of second columnar protrusions 93A2 are provided according to the region where the phosphor layer 61 is provided. Note that the plurality of fins 72 are arranged on the second surface 63B of the support substrate 63 so as to include a region corresponding to the phosphor layer 61 provided on the first surface 63A.

[0069] Even in the light source device including such a heat radiating member 9B, when the phosphor wheel 6 rotates, an air flow AF mainly occurs from the center of the phosphor wheel 6 toward the outside by the plurality of fins 72 provided on the phosphor wheel 6. The air flow AF flows along the inner wall CA11 of the accommodation space CA1 and flows to the heat receiving member 92 facing the plurality of fins 72, similarly to the first embodiment. The air flow AF that has flowed to the heat receiving member 92 collides with the plurality of second columnar protrusions 93A2 and the plurality of first columnar protrusions 93A1, and flows between the plurality of second columnar protrusions 93A2 and between the plurality of first columnar protrusions 93A1 along the surface 92A toward the installation portion 921. In this process, heat is transferred from the air flow AF to the plurality of columnar protrusions 93A. The air flow AF that has flowed between the plurality of columnar protrusions 93A and has been cooled is sucked by the plurality of fins 72.

[0070] [Effect of Second Embodiment] The projector according to the present embodiment described above can achieve the same effects as the projector 1 according to the first embodiment, and further has the following effects. In the light source device according to the present embodiment, the plurality of columnar protrusions 93A include a plurality of first columnar protrusions 93A1 arranged on the installation portion 921 side when viewed from the phosphor wheel 6, and a plurality of second columnar protrusions 93A2 arranged outside the plurality of first columnar protrusions 93A1 when viewed from the phosphor wheel 6. Here, when the air flow AF generated by the plurality of fins 72 flows along the heat receiving member 92 as the phosphor wheel 6 rotates, the air flow AF flows from the outside of the heat receiving member 92 toward the installation portion 921. Therefore, in the process of the air flow AF flowing toward the installation portion 921, the air flow AF can be easily made to flow along each of the second columnar protrusion 93A2 and the first columnar protrusion 93A1. According to this, heat can be easily transferred from the air flow AF to the columnar protrusion 93A. Therefore, the cooling efficiency of the air flow AF can be increased, and thus the cooling efficiency of the phosphor layer 61 can be increased.

[0071] In the light source device according to this embodiment, the plurality of first columnar protrusions 93A1 and the plurality of second columnar protrusions 93A2 are arranged in a concentric circle centered on the installation portion 921. The plurality of first columnar protrusions 93A1 are provided at each first angle centered on the installation portion 921. The plurality of second columnar protrusions 93A2 are provided at each second angle centered on the installation portion 921. The first angle and the second angle are different. Specifically, the second angle is smaller than the first angle. According to such a configuration, the number of the second columnar protrusions 93A2 arranged on the outer side can be made larger than the number of the first columnar protrusions 93A1 arranged on the installation portion 921 side. Further, since the number of the first columnar protrusions 93A1 is smaller than the number of the second columnar protrusions 93A2, the gap between the plurality of first columnar protrusions 93A1 can be enlarged. Thereby, the airflow AF can be made to flow through the plurality of second columnar protrusions 93A2 to promote heat transfer from the airflow AF to the second columnar protrusions 93A2, and the airflow can be made to easily flow between the plurality of first columnar protrusions 93A1. Therefore, the temperature of the airflow AF flowing through the heat dissipation portion 7 to which the heat of the phosphor layer 61 is transferred can be lowered, and the cooling efficiency of the phosphor layer 61 can be enhanced.

[0072] In the light source device according to this embodiment, the plurality of second columnar protrusions 93A2 are arranged corresponding to the region where the phosphor layer 61 is provided in the phosphor wheel 6. Here, when the phosphor wheel 6 rotates, the airflow AF mainly flows from the center side to the outer side of the phosphor wheel 6, and the airflow also flows from the plurality of fins 72 toward the heat receiving member 92. For this reason, by arranging the plurality of second columnar protrusions 93A2 as described above, it is possible to easily transfer the heat generated in the phosphor layer 61 to the plurality of second columnar protrusions 93A2 via the airflow AF. Therefore, it is possible to easily transfer the heat generated in the phosphor layer 61 to the columnar protrusions 93A at a position far from the installation portion 921 where the driving portion 8 is installed.

[0073] [Third Embodiment] Next, a third embodiment of the present disclosure will be described. The projector according to this embodiment has the same configuration as the projector 1 according to the first embodiment, but the configuration of the plurality of columnar protrusions is different. In the following description, parts that are the same as or substantially the same as the parts already described are denoted by the same reference numerals and the description thereof is omitted.

[0074] [Schematic Configuration of Projector and Light Source Device] FIG. 11 is a plan view of the heat dissipation member 9C of the light source device included in the projector according to this embodiment, as viewed from the incident side of the excitation light. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it includes the wavelength conversion device 5C shown in FIG. 11 instead of the wavelength conversion device 5A according to the first embodiment. That is, the light source device according to this embodiment has the same configuration and functions as the light source device 4 according to the first embodiment, except that it includes the wavelength conversion device 5C instead of the wavelength conversion device 5A. The wavelength conversion device 5C has the same configuration and functions as the wavelength conversion device 5A, except that it includes the heat dissipation member 9C instead of the heat dissipation member 9A. That is, the wavelength conversion device 5C includes a phosphor wheel 6, a heat dissipation part 7, a drive part 8, and a heat dissipation member 9C.

[0075] [Configuration of Heat Dissipation Member] The heat dissipation member 9C has the same configuration and functions as the heat dissipation member 9B according to the second embodiment, except that it has a plurality of columnar protrusions 93C instead of the plurality of columnar protrusions 93A. That is, the heat dissipation member 9C includes a heat sink 91, a heat receiving member 92, and a plurality of columnar protrusions 93C.

[0076] As shown in FIG. 11, the plurality of columnar protrusions 93C are provided around the installation part 921 so as to be heat-transferable with the surface 92A of the heat receiving member 92, and project into the accommodation space CA1 of the light source housing CA toward the plurality of fins 72 of the heat dissipation part 7. Then, in the accommodation space CA1, the plurality of columnar protrusions 93C receive heat from the air flow AF generated by the plurality of fins 72 as the phosphor wheel 6 rotates, and transfer the received heat to the heat sink 91 via the heat receiving member 92. On the surface 92A of the heat receiving member 92 of the heat radiating member 9C, a plurality of reference circles CR1 to CR6, which are concentric circles at substantially equal intervals centered on the installation portion 921, are set in the same manner as the heat receiving member 92 of the heat radiating member 9B.

[0077] The plurality of columnar protrusions 93C are provided at equal intervals in the circumferential direction (+D2 direction) centered on the installation portion 921 on each of the reference circles CR1 to CR6. Specifically, each of the plurality of columnar protrusions 93C arranged on the reference circles CR1 to CR3 on the side of the installation portion 921 is a first columnar protrusion 93C1 provided at each first angle centered on the installation portion 921. In the present embodiment, the first angle is 30°. Also, the arrangement period of the first columnar protrusions 93C1 arranged on the reference circles CR1 and CR3 and the arrangement period of the first columnar protrusions 93C1 arranged on the reference circle CR2 are shifted in phase by 15°. However, it is not limited to this, and the first angle may be other angles, and the phases of the arrangement periods of the first columnar protrusions 93C1 arranged on the reference circles CR1, CR2, and CR3 may be the same.

[0078] Each of the plurality of columnar protrusions 93C arranged on the reference circles CR4 to CR6 outside the installation portion 921 is a second columnar protrusion 93C2 provided at each second angle centered on the installation portion 921. In the present embodiment, the second angle is 30°, which is the same as the first angle. The area of the cross section orthogonal to the protruding direction from the surface 92A of the second columnar protrusion 93C2 is larger than the area of the cross section orthogonal to the protruding direction from the surface 92A of the first columnar protrusion 93C1. In other words, the area of the cross section of the second columnar protrusion 93C2 orthogonal to the protruding direction into the accommodation space CA1 is larger than the area of the cross section of the first columnar protrusion 93C1 orthogonal to the protruding direction. Note that the arrangement period of the second columnar protrusions 93C2 arranged on the reference circles CR4 and CR6 is out of phase by 15° with the arrangement period of the second columnar protrusions 93C2 arranged on the reference circle CR5. However, this is not the only case, and the second angle may be other angles, and the phases of the arrangement periods of the first columnar protrusions 93C1 arranged on the reference circles CR4, CR5, and CR6 may be the same. Also, the second angle may be smaller than the first angle or larger than the first angle.

[0079] As described above, the plurality of columnar protrusions 93C includes a plurality of first columnar protrusions 93C1 and a plurality of second columnar protrusions 93C2. The plurality of first columnar protrusions 93C1 are arranged on the installation portion 921 side as viewed from the phosphor wheel 6. The plurality of second columnar protrusions 93C2 are arranged outside the plurality of first columnar protrusions 93C1 as viewed from the phosphor wheel 6, and the area of the cross section of the second columnar protrusion 93C2 is larger than the area of the cross section of the first columnar protrusion 93C1. Note that not limited to the comparison by the cross-sectional area, the volume of the first columnar protrusion and the volume of the second columnar protrusion may be compared. In this case, the volume of the second columnar protrusion 93C2 may be larger than the volume of the first columnar protrusion 93C1. Similar to the plurality of second columnar protrusions 93A2 according to the second embodiment, the plurality of second columnar protrusions 93C2 are provided according to the region where the phosphor layer 61 of the phosphor wheel 6 is provided. Specifically, when the wavelength conversion device 5C is viewed from the incident side of the excitation light, the plurality of second columnar protrusions 93C2 are provided according to the region where the phosphor layer 61 is provided. Note that the plurality of fins 72 are arranged on the second surface 63B of the support substrate 63 so as to include a region corresponding to the phosphor layer 61 provided on the first surface 63A.

[0080] Even in the light source device including such a heat radiating member 9C, when the phosphor wheel 6 rotates, an air flow AF mainly generated from the center of the phosphor wheel 6 toward the outside is generated by a plurality of fins 72 provided on the phosphor wheel 6. Similar to the first embodiment, the air flow AF flows along the inner wall CA11 of the accommodation space CA1 and flows into the heat receiving member 92 facing the plurality of fins 72. The air flow AF flowing into the heat receiving member 92 collides with the plurality of second columnar protrusions 93C2 and the plurality of first columnar protrusions 93C1, and flows along the surface 92A between the plurality of second columnar protrusions 93C2 and between the plurality of first columnar protrusions 93C1 toward the installation portion 921. In this process, heat is transferred from the air flow AF to the plurality of columnar protrusions 93C. The air flow AF cooled by flowing between the plurality of columnar protrusions 93C is sucked by the plurality of fins 72.

[0081] [Effect of the Third Embodiment] The projector according to the present embodiment described above can achieve the same effects as the projectors according to the first and second embodiments, and can also achieve the following effects. In the light source device according to the present embodiment, the area of the cross section of the second columnar protrusion 93C2 orthogonal to the protruding direction of the light source housing CA into the accommodation space CA1 is larger than the area of the cross section of the first columnar protrusion 93C1 orthogonal to the protruding direction. Here, when the area of the cross section of the first columnar protrusion disposed on the installation portion 921 side is large, the interval between the plurality of first columnar protrusions becomes small, so that the air flow AF in the portion of the heat receiving member 92 on the installation portion 921 side is likely to be obstructed. On the contrary, by making the area of the cross section of the second columnar protrusion 93C2 larger than the area of the cross section of the first columnar protrusion 93C1, heat can be easily transferred from the air flow AF to the columnar protrusion 93C at the outer portion of the heat receiving member 92 where the air flow AF easily flows. Therefore, the temperature of the air flow AF flowing through the heat radiating portion 7 can be lowered, and the cooling efficiency of the phosphor layer 61 can be enhanced.

[0082] [Fourth Embodiment] Next, a fourth embodiment of the present disclosure will be described. The projector according to this embodiment has the same configuration as the projector 1 according to the first embodiment, but the configuration of the plurality of columnar protrusions of the heat dissipation member is different. Specifically, among the plurality of columnar protrusions according to this embodiment, the second columnar protrusion is provided at a position closer to the phosphor wheel and the heat dissipation part than the first columnar protrusion. In the following description, parts that are the same as or substantially the same as the parts already described are denoted by the same reference numerals and the description thereof is omitted.

[0083] [Schematic Configuration of Projector and Light Source Device] FIG. 12 is a diagram schematically showing a cross section of a wavelength conversion device 5D of a light source device included in the projector according to this embodiment. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it includes the wavelength conversion device 5D shown in FIG. 12 instead of the wavelength conversion device 5A according to the first embodiment. That is, the light source device according to this embodiment has the same configuration and functions as the light source device 4 according to the first embodiment, except that it includes the wavelength conversion device 5D instead of the wavelength conversion device 5A. The wavelength conversion device 5D has the same configuration and functions as the wavelength conversion device 5A, except that it includes a heat dissipation member 9D instead of the heat dissipation member 9A. That is, the wavelength conversion device 5C includes a phosphor wheel 6, a heat dissipation part 7, a drive part 8, and a heat dissipation member 9D.

[0084] [Configuration of Heat Dissipation Member] The heat dissipation member 9D has the same configuration and functions as the heat dissipation member 9B according to the second embodiment, except that it has a plurality of columnar protrusions 93D instead of the plurality of columnar protrusions 93A. That is, the heat dissipation member 9D includes a heat sink 91, a heat receiving member 92, and a plurality of columnar protrusions 93D.

[0085] As shown in Fig. 12, the plurality of columnar protrusions 93D are provided around the installation portion 921 in heat transferable contact with the surface 92A of the heat receiving member 92, and protrude into the accommodation space CA1 of the light source housing CA toward the plurality of fins 72 of the heat radiating portion 7. Then, within the accommodation space CA1, the plurality of columnar protrusions 93D are heated by the airflow AF generated by the plurality of fins 72 as the phosphor wheel 6 rotates, and the heat received is transmitted to the heat sink 91 via the heat receiving member 92.

[0086] Although not shown in the figure, on the surface 92A of the heat receiving member 92 of the heat radiating member 9D, a plurality of reference circles CR1 to CR6, which are substantially equally spaced concentric circles centered on the installation portion 921, are set in the same manner as the heat receiving member 92 of the heat radiating member 9B. The plurality of reference circles CR1 to CR6 are virtual concentric circles. The plurality of columnar protrusions 93D include a plurality of first columnar protrusions 93D1 arranged at each first angle around the installation portion 921 on the reference circles CR1 to CR3 on the side of the installation portion 921, and a plurality of second columnar protrusions 93D2 arranged at each second angle around the installation portion 921 on the reference circles CR4 to CR6 set outside the reference circles CR1 to CR3. That is, the plurality of columnar protrusions 93D include a plurality of first columnar protrusions 93D1 arranged on the side of the installation portion 921 as viewed from the phosphor wheel, and a plurality of second columnar protrusions 93D2 arranged outside the plurality of first columnar protrusions 93D1 as viewed from the phosphor wheel 6. Note that the first angle and the second angle can be changed as appropriate, and the second angle may be the same as the first angle or different from the first angle. In the latter case, the second angle may be smaller or larger than the first angle.

[0087] In this embodiment, the dimension of the second columnar protrusion 93D2 in the protruding direction into the accommodation space CA1 is larger than the dimension of the first columnar protrusion 93D1 in the protruding direction into the accommodation space CA1. In other words, the dimension of the second columnar protrusion 93D2 in the protruding direction from the heat-receiving member 92 is larger than the dimension of the first columnar protrusion 93D1 in the protruding direction from the heat-receiving member 92. That is, the distance between each of the plurality of second columnar protrusions 93D2 and the heat-radiating part 7 is smaller than the distance between each of the plurality of first columnar protrusions 93D1 and the heat-radiating part 7. Further, the distance between each of the plurality of second columnar protrusions 93D2 and the phosphor wheel 6 is smaller than the distance between each of the plurality of first columnar protrusions 93D1 and the phosphor wheel 6. Note that the dimension of the first columnar protrusion 93D1 in the protruding direction into the accommodation space CA1 is larger than the dimension in the direction orthogonal to the protruding direction into the accommodation space CA1 (outer diameter) of the first columnar protrusion 93D1. Also, the dimension of the second columnar protrusion 93D2 in the protruding direction into the accommodation space CA1 is larger than the dimension in the direction orthogonal to the protruding direction into the accommodation space CA1 (outer diameter) of the second columnar protrusion 93D2.

[0088] Also in this embodiment, the area of the cross-section orthogonal to the protruding direction into the accommodation space CA1 of the first columnar protrusion 93D1 and the area of the cross-section orthogonal to the protruding direction into the accommodation space CA1 of the second columnar protrusion 93D2 are the same. However, it is not limited to this, and the area of the above cross-section of the first columnar protrusion 93D1 and the area of the above cross-section of the second columnar protrusion 93D2 may be different. For example, like the first columnar protrusion 93C1 and the second columnar protrusion 93C2, the area of the above cross-section of the second columnar protrusion 93D2 may be larger than the area of the above cross-section of the first columnar protrusion 93D1.

[0089] Even in a light source device including such a heat radiating member 9D, when the phosphor wheel 6 rotates, an air flow AF mainly generated from the center of the phosphor wheel 6 toward the outside is generated by a plurality of fins 72 provided on the phosphor wheel 6. The air flow AF flows along the inner wall CA11 of the accommodation space CA1 and flows into the heat receiving member 92 facing the plurality of fins 72, similar to the first embodiment. The air flow AF that has flowed into the heat receiving member 92 collides with the plurality of second columnar protrusions 93D2 and the plurality of first columnar protrusions 93D1, and flows along the surface 92A between the plurality of second columnar protrusions 93D2 and between the plurality of first columnar protrusions 93D1 toward the installation portion 921. In this process, heat is transferred from the air flow AF to the plurality of columnar protrusions 93D. The air flow AF that has flowed between the plurality of columnar protrusions 93D and has been cooled is sucked by the plurality of fins 72. Also, the distance between each of the plurality of second columnar protrusions 93D2 and the heat radiating portion 7 is smaller than the distance between each of the plurality of first columnar protrusions 93D1 and the heat radiating portion 7. That is, the contact area between the second columnar protrusion 93D2 and the air flow AF is larger than the contact area between the first columnar protrusion 93D1 and the air flow AF. Therefore, heat of the air flow AF can be transferred to the heat receiving member 92 and the heat sink 91 through the columnar protrusion 93D at the outer portion away from the installation portion 921.

[0090] [Effects of the Fourth Embodiment] According to the projector according to the present embodiment described above, in addition to being able to achieve the same effects as the projectors according to the first to third embodiments, the following effects can be achieved. In the light source device according to the present embodiment, the distance between each of the plurality of second columnar protrusions 93D2 and the heat radiating portion 7 is smaller than the distance between each of the plurality of first columnar protrusions 93D1 and the heat radiating portion 7. The heat radiating portion 7 corresponds to the heat radiating portion on the wheel side. According to such a configuration, it is possible to facilitate the transfer of heat from the heat radiating portion 7 to the columnar protrusion 93D through the air flow AF at a position away from the installation portion 921 where the driving portion 8 is installed. Therefore, the transfer of heat to the driving portion 8 can be suppressed, and the influence of heat on the driving portion 8 can be suppressed.

[0091] [Modifications of the Embodiment] The present disclosure is not limited to the above-described embodiments, and modifications, improvements, etc. within the scope that can achieve the object of the present disclosure are included in the present disclosure. In each of the above embodiments, the heat dissipation part 7 includes a heat transfer substrate 71 provided on the second surface 63B of the support substrate 63 of the phosphor wheel 6, which is opposite to the first surface 63A where the phosphor layer 61 is provided, and a plurality of fins 72 standing up from the heat transfer substrate 71. However, it is not limited to this, and the heat transfer substrate 71 may be omitted, and the plurality of fins 72 may be directly provided on the second surface 63B. Further, the plurality of fins 72 may be provided on the same surface as the surface where the phosphor layer 61 is provided in the phosphor wheel 6. Also, it is assumed that the plurality of fins 72 are curved in a direction opposite to the rotation direction of the phosphor wheel 6 as they go from the center side to the outside of the support substrate 63. However, it is not limited to this, and the shape of the fins 72 may be other shapes, such as a shape extending linearly.

[0092] In each of the above embodiments, the heat dissipation members 9A to 9D have a heat sink 91 that is heat-transferably connected to the heat-receiving member 92 on the side opposite to the phosphor wheel 6 and is disposed outside the light source housing CA. However, it is not limited to this, and the heat sink 91 and the heat-receiving member 92 may be an integral member.

[0093] In each of the above embodiments, each of the plurality of columnar protrusions 93A, 93C, 93D is configured to generate turbulent flow that collides with a surface opposite to the surface where the air flow collides with the columnar protrusion. However, it is not limited to this, and the columnar protrusion that generates turbulent flow may be at least one of the plurality of columnar protrusions of the heat dissipation member. That is, it is not necessarily required that all of the plurality of columnar protrusions of the heat dissipation member generate turbulent flow. Also, such turbulent flow may not occur.

[0094] In the above-described first embodiment, it was assumed that the plurality of columnar protrusions 93A are arranged on a plurality of reference circles CR1 to CR3 that are concentric circles centered on the installation portion 921. That is, the plurality of columnar protrusions 93A include the plurality of columnar protrusions 93A arranged on the reference circle CR1 on the installation portion 921 side as viewed from the phosphor wheel 6, and the plurality of columnar protrusions 93A arranged on the reference circles CR2 and CR3 arranged outside the reference circle CR1 as viewed from the phosphor wheel 6. In the above-described second to fourth embodiments, it was assumed that the plurality of columnar protrusions 93A, 93C, and 93D are arranged on a plurality of reference circles CR1 to CR6 that are concentric circles centered on the installation portion 921. That is, the plurality of columnar protrusions 93A, 93C, and 93D include a plurality of first columnar protrusions 93A1, 93C1, and 93D1 arranged on the installation portion 921 side as viewed from the phosphor wheel 6, and a plurality of second columnar protrusions 93A2, 93C2, and 93D2 arranged outside the plurality of first columnar protrusions 93A1, 93C1, and 93D1 as viewed from the phosphor wheel 6. However, the present invention is not limited to this, and the columnar protrusions included in the heat radiating members 9A to 9D may be provided around the installation portion 921 of the heat receiving member 92, and the arrangement of the columnar protrusions can be appropriately changed. For example, the plurality of columnar protrusions may be randomly arranged around the installation portion 921.

[0095] In the above-described second embodiment, the plurality of first columnar protrusions 93A1 are provided at every first angle centered on the installation portion 921, the plurality of second columnar protrusions 93A2 are provided at every second angle centered on the installation portion 921, and the second angle is smaller than the first angle. However, the present invention is not limited to this, and the second angle may be the same as the first angle or may be larger than the first angle. The same applies to the third and fourth embodiments in which the plurality of columnar protrusions 93C and 93D include a plurality of first columnar protrusions 93C1 and 93D1 provided at every first angle centered on the installation portion 921 and a plurality of second columnar protrusions 93C2 and 93D2 provided at every second angle centered on the installation portion 921.

[0096] In the above-described third embodiment, the area of the cross-section orthogonal to the protruding direction of the second columnar protrusion 93C2 protruding into the accommodation space CA1 from the surface 92A of the heat-receiving member 92 toward the plurality of fins 72 is set to be larger than the area of the cross-section orthogonal to the protruding direction of the first columnar protrusion 93C1 protruding into the accommodation space CA1 from the surface 92A of the heat-receiving member 92 toward the plurality of fins 72. However, the present invention is not limited to this, and the area of the above cross-section of the second columnar protrusion 93C2 may be smaller than the area of the above cross-section of the first columnar protrusion 93C1. When the area of the cross-section of one of the columnar protrusions of the first columnar protrusion 93C1 and the second columnar protrusion 93C2 is larger than the area of the cross-section of the other columnar protrusion, one of the first angle and the second angle may be larger than the other angle, or may be the same.

[0097] In the above-described fourth embodiment, the distance between the second columnar protrusion 93D2 and the heat-radiating portion 7 is set to be smaller than the distance between the first columnar protrusion 93D1 and the heat-radiating portion 7. However, the present invention is not limited to this, and the distance between the second columnar protrusion 93D2 and the heat-radiating portion 7 may be larger than the distance between the first columnar protrusion 93D1 and the heat-radiating portion 7, or may be the same. Further, among the plurality of columnar protrusions, if the distance between at least one columnar protrusion and the heat-radiating portion 7 is smaller than the distance between the other columnar protrusions and the heat-radiating portion 7, the position of the at least one columnar protrusion is not limited. The same applies to other embodiments.

[0098] In the above-described second to fourth embodiments, the second columnar protrusions 93A2, 93C2, 93D2 are arranged corresponding to the region where the phosphor layer 61 is provided in the phosphor wheel 6. However, the present invention is not limited to this, and the second columnar protrusions 93A2, 93C2, 93D2 may not be arranged corresponding to the region where the phosphor layer 61 is provided in the phosphor wheel 6. For example, the second columnar protrusions may be provided in a range wider than the region where the phosphor layer 61 is provided, or may be provided in a range narrower than the region where the phosphor layer 61 is provided. Further, the second columnar protrusions may be arranged regardless of the region where the phosphor layer 61 is provided.

[0099] In each of the above embodiments, it is assumed that the phase of the arrangement period of the columnar protrusions arranged on the reference circle CR1 is different from the phase of the arrangement period of the columnar protrusions arranged on the reference circle CR2. However, the present invention is not limited to this, and the reference circle in which the phase of the arrangement period of the columnar protrusions is different from that of the other columnar protrusions may be another reference circle. Further, the phases of the arrangement periods of the columnar protrusions may be the same or different from each other in all the reference circles. In each of the above embodiments, it is assumed that the columnar protrusions 93A, 93C, and 93D are formed in a substantially frustum shape. However, the present invention is not limited to this, and the columnar protrusions 93A, 93C, and 93D may be formed in a substantially frustum pyramid shape, or may be formed in a substantially cylindrical shape or a substantially prismatic shape.

[0100] In the first embodiment, it is assumed that three reference circles CR1 to CR3 centered on the installation portion 921 are set on the surface 92A of the heat receiving member 92. In the second to fourth embodiments, it is assumed that six reference circles CR1 to CR6 centered on the installation portion 921 are set on the surface 92A of the heat receiving member 92. However, the present invention is not limited to this, and the number of reference circles on which the columnar protrusions are arranged can be set as appropriate.

[0101] In each of the above embodiments, it is assumed that the heat receiving member 92 includes a wiring arrangement portion 922 in which a wiring FPC connected to the driving portion 8 arranged in the installation portion 921 is arranged. And it is assumed that the plurality of columnar protrusions 93A, 93C, and 93D are provided in a portion excluding the wiring arrangement portion 922. However, the present invention is not limited to this, and the wiring arrangement portion 922 may be omitted. Further, a part of the driving portion 8 may be arranged outside the light source housing CA, and the wiring FPC connected to the driving portion 8 may be connected to the driving portion 8 outside the light source housing CA. Furthermore, the wiring FPC does not have to be a flexible printed circuit board.

[0102] In each of the above embodiments, it is assumed that the light source device 4 has the configuration and layout shown in FIG. 2. However, the present invention is not limited to this, and the configuration and layout included in the light source device of the present disclosure are not limited to the above examples. The same applies to the projector including the light source device of the present disclosure.

[0103] In each of the above embodiments, it is assumed that the projector includes three light modulation devices 343B, 343G, and 343R. However, the present disclosure is not limited to this, and can also be applied to projectors including two or less or four or more light modulation devices. In each of the above embodiments, it is assumed that the light modulation device 343 has a transmissive liquid crystal panel in which the light incident surface and the light exit surface are different. However, the present disclosure is not limited to this, and the light modulation device included in the projector of the present disclosure may be configured to include a reflective liquid crystal panel in which the light incident surface and the light exit surface are the same. Further, any light modulation device that can modulate an incident light beam to form an image according to image information, such as a device using a micromirror such as a DMD (Digital Micromirror Device), may be used as the light modulation device other than liquid crystal in the projector.

[0104] In each of the above embodiments, an example in which the light source device of the present disclosure is applied to a projector is given. However, the present disclosure is not limited to this, and the light source device of the present disclosure may be applied to electronic devices other than projectors, such as lighting devices and headlights of automobiles.

[0105] [Summary of the Present Disclosure] The summary of the present disclosure is appended below. The light source device according to the first aspect of the present disclosure includes a housing, a phosphor wheel having a phosphor that converts the wavelength of incident light, and is disposed within the housing, and a plurality of fins provided on one surface of the phosphor wheel. When the phosphor wheel rotates, a wheel-side heat dissipation portion that generates an air flow flowing from the center side to the outside of the phosphor wheel by the plurality of fins, a drive portion that rotates the phosphor wheel, an installation portion where the drive portion is installed, a heat receiving member facing the wheel-side heat dissipation portion, and a heat sink disposed outside the housing and heat-transferably connected to the heat receiving member on the side opposite to the phosphor wheel with respect to the heat receiving member, and a plurality of columnar protrusions provided around the installation portion so as to be heat-transferable with the heat receiving member and protruding into the housing toward the plurality of fins. Among the plurality of columnar protrusions, the dimension along the protruding direction of at least one columnar protrusion is larger than the dimension in the direction orthogonal to the protruding direction of the at least one columnar protrusion. Among the plurality of columnar protrusions, the columnar protrusions disposed on the upstream side of the air flow flowing through the plurality of columnar protrusions disperse the air flow toward the other columnar protrusions disposed on the downstream side of the air flow.

[0106] According to such a configuration, when the phosphor wheel is rotated by the drive portion, an air flow from the center to the outside of the phosphor wheel is generated by the plurality of fins of the wheel-side heat dissipation portion. At this time, since the heat of the phosphor wheel, that is, the heat generated by the phosphor, is transferred from the plurality of fins to the air flow, the phosphor can be cooled. In addition, an air flow generated by the rotation of the phosphor wheel flows through the heat receiving member disposed at a position facing the wheel-side heat dissipation portion. A plurality of columnar protrusions protruding into the housing toward the plurality of fins are provided around the installation portion of the heat receiving member. Since the plurality of columnar protrusions are heat-transferably connected to the heat receiving member, the heat received by the plurality of columnar protrusions is transferred to the heat sink via the heat receiving member and dissipated to the outside of the housing. Thereby, the temperature inside the housing can be reduced, and the temperature of the air flow flowing through the plurality of fins can be lowered, so that the cooling efficiency of the phosphor of the phosphor wheel can be enhanced. Furthermore, the heat receiving member is disposed at a position facing the wheel side heat radiating portion. A plurality of columnar protrusions that are heat transferably connected to the heat sink via the heat receiving member protrude toward the plurality of fins of the wheel side heat radiating portion. The heat sink is heat transferably connected to the heat receiving member on the side opposite to the phosphor wheel. For this reason, it is possible to reduce the configuration that protrudes outside the housing other than the heat sink. Thereby, compared with the configuration in which the heat sink is provided on each of the plurality of side surfaces of the housing, the increase in the size of the light source device can be suppressed. Therefore, it is possible to improve the cooling efficiency of the light source device and suppress the increase in size.

[0107] In the first aspect, at least one of the plurality of columnar protrusions may generate a turbulent flow that collides with a surface opposite to the surface with which the airflow collides with respect to the at least one columnar protrusion. According to such a configuration, in the columnar protrusion, the contact area with the airflow that has flowed through the wheel side heat radiating portion and is heated can be increased. Therefore, the heat transfer of the airflow to the columnar protrusion can be promoted, and the cooling efficiency of the phosphor can be enhanced.

[0108] In the first aspect, the plurality of columnar protrusions may include a plurality of first columnar protrusions disposed on the installation portion side when viewed from the phosphor wheel, and a plurality of second columnar protrusions disposed outside the plurality of first columnar protrusions when viewed from the phosphor wheel. Here, when the airflow generated by the plurality of fins circulates along the heat receiving member as the phosphor wheel rotates, the airflow circulates from the outside of the heat receiving member toward the installation portion. Therefore, a plurality of columnar protrusions provided around the installation part so as to be thermally conductive to the heat receiving member include a plurality of first columnar protrusions arranged on the installation part side and second columnar protrusions arranged outside the plurality of first columnar protrusions. Thus, in the process of the air flow flowing toward the installation part, the air flow can be easily made to flow along each of the second columnar protrusions and the first columnar protrusions. According to this, heat can be easily transferred from the air flow to the columnar protrusions. Therefore, the cooling efficiency of the air flow can be increased, and thus, the cooling efficiency of the phosphor can be increased.

[0109] In the first aspect, the plurality of first columnar protrusions and the plurality of second columnar protrusions are arranged in a concentric circle centered on the installation part. The plurality of first columnar protrusions are provided at each first angle centered on the installation part, and the plurality of second columnar protrusions are provided at each second angle centered on the installation part. The first angle and the second angle may be different. According to such a configuration, by making the second angle smaller than the first angle, the number of the second columnar protrusions arranged on the outer side can be made larger than the number of the first columnar protrusions arranged on the installation part side. Further, since the number of the first columnar protrusions is smaller than the number of the second columnar protrusions, the gap between the plurality of first columnar protrusions can be enlarged. Thereby, the air flow can be made to flow through the plurality of second columnar protrusions to promote heat transfer from the air flow to the second columnar protrusions, and the air flow can be easily made to flow between the plurality of first columnar protrusions. On the other hand, by making the second angle larger than the first angle, the gap between the plurality of second columnar protrusions can be enlarged, and the number of the plurality of first columnar protrusions arranged on the installation part side can be increased. Thereby, the air flow can be easily made to flow through the plurality of first columnar protrusions. Therefore, the temperature of the air flow flowing through the wheel side heat radiating part to which the heat of the phosphor is transferred can be lowered, and the cooling efficiency of the phosphor can be increased.

[0110] In the first aspect, the second angle may be smaller than the first angle. According to such a configuration, as described above, the number of the second columnar protrusions arranged on the outside can be increased, and the gap between the plurality of first columnar protrusions arranged on the installation portion side can be increased. Thereby, the air flow can be circulated through the plurality of second columnar protrusions to promote heat transfer from the air flow to the second columnar protrusions, and the air flow can easily flow between the plurality of first columnar protrusions. Therefore, the cooling efficiency of the phosphor can be increased.

[0111] In the first aspect, the area of the cross section of the second columnar protrusion orthogonal to the protruding direction may be larger than the area of the cross section of the first columnar protrusion orthogonal to the protruding direction. Here, when the area of the cross section of the first columnar protrusion is large, the interval between the plurality of first columnar protrusions becomes small, so that the air flow in the portion on the installation portion side of the heat receiving member is likely to be obstructed. On the other hand, by making the area of the cross section of the second columnar protrusion larger than the area of the cross section of the first columnar protrusion, heat can be easily transferred from the air flow to the columnar protrusion in the outer portion where the air flow easily flows in the heat receiving member. Therefore, the temperature of the air flow flowing through the wheel side heat radiating portion can be lowered, and the cooling efficiency of the phosphor can be increased.

[0112] In the first aspect, the distance between each of the plurality of second columnar protrusions and the wheel side heat radiating portion may be smaller than the distance between each of the plurality of first columnar protrusions and the wheel side heat radiating portion. According to such a configuration, heat can be easily transferred from the wheel side heat radiating portion to the columnar protrusion at a position away from the installation portion where the driving portion is installed. Therefore, the transfer of heat to the driving portion can be suppressed, and the influence of heat on the driving portion can be suppressed.

[0113] In the first aspect, the plurality of second columnar protrusions may be arranged corresponding to the region where the phosphor is provided in the phosphor wheel. Here, when the phosphor wheel rotates, the air flow mainly flows from the center side to the outside of the phosphor wheel, and the air flow also flows from the plurality of fins toward the heat receiving member. Therefore, by arranging a plurality of second columnar protrusions as described above, it is possible to easily transfer the heat generated in the phosphor to the plurality of second columnar protrusions via the air flow. Accordingly, it is possible to easily transfer the heat generated in the phosphor to the columnar protrusions at a position away from the installation portion where the driving portion is installed.

[0114] In the first aspect, the heat receiving member may have a wiring arrangement portion where wirings connected to the driving portion are arranged, and the plurality of columnar protrusions may be provided in a portion of the heat receiving member excluding the wiring arrangement portion. According to such a configuration, it is possible to suppress the wirings connected to the driving portion from coming into contact with the columnar protrusions through which the heat of the phosphor is transferred via the air flow. Accordingly, it is possible to suppress the heat from affecting the wirings and the driving portion.

[0115] The light source device according to the second aspect of the present disclosure includes a housing, a phosphor that converts the wavelength of incident light, a phosphor wheel disposed in the housing, a wheel-side heat radiating portion having a plurality of fins provided on one surface of the phosphor wheel, and the phosphor wheel rotates to generate an air flow that circulates from the center side to the outside of the phosphor wheel by the plurality of fins, a driving portion that rotates the phosphor wheel, and a heat radiating member that faces the wheel-side heat radiating portion. The heat radiating member includes an installation portion where the driving portion is installed, a heat sink provided on the opposite side of the phosphor wheel with respect to the installation portion and disposed outside the housing, and a plurality of columnar protrusions provided around the installation portion and protruding into the housing toward the plurality of fins. Among the plurality of columnar protrusions, the dimension along the protruding direction of at least one columnar protrusion is larger than the dimension in the direction orthogonal to the protruding direction of the at least one columnar protrusion. Among the plurality of columnar protrusions, the columnar protrusions arranged on the upstream side of the air flow flowing through the plurality of columnar protrusions disperse the air flow toward the columnar protrusions arranged on the downstream side of the air flow. According to such a configuration, the same effects as those of the light source device according to the first aspect can be achieved.

[0116] The projector according to the third aspect of the present disclosure includes the light source device according to the first aspect or the second aspect, an image forming device that forms image light using the light emitted from the light source device, and a projection optical device that projects the image light formed by the image forming device. According to such a configuration, the same effects as those of the light source device according to the first aspect or the second aspect can be achieved. In addition, since the cooling efficiency of the phosphor can be increased, the intensity of the light incident on the phosphor can be increased, and the luminance of the light emitted from the light source device can be increased. Therefore, the luminance of the projected image light can be increased.

Description of Reference Numerals

[0117] 1... Projector, 34... Image forming device, 343, 343B, 343G, 343R... Light modulation device, 36... Projection optical device, 4... Light source device, 40... Light source unit, 41... Afocal optical element, 411, 412... Lens, 42... First phase difference element, 43... Diffusion transmission element, 44... Optical separation and combination element, 45... Second phase difference element, 46... First condensing element, 461, 462, 463... Lens, 47... Diffusion optical element, 48... Second condensing element, 481, 482, 483... Lens, 49... Third phase difference element, 5A, 5B, 5C, 5D... Wavelength conversion device, 6... Phosphor wheel, 61... Phosphor layer (phosphor), 62... Reflective layer, 63... Support substrate, 63A... First surface, 63B... Second surface, 7... Heat radiating part (heat radiating part on the wheel side), 71... Heat transfer substrate, 72... Fin, 73... Groove part, 8... Driving part, 81... Rotating part, 82... Main body part, 9A, 9B, 9C, 9D... Heat radiating member, 91... Heat sink, 92... Heat receiving member, 92A... Surface, 921... Installation part, 922... Wiring arrangement part, 93A, 93C, 93D... Columnar protrusion, 93A1, 93C1, 93D1... First columnar protrusion, 93A2, 93C2, 93D2... Second columnar protrusion, CA... Light source housing (housing), FN... Fan, FPC... Wiring.

Claims

1. A housing, a phosphor wheel having a phosphor for converting the wavelength of incident light and disposed within the housing, a wheel-side heat radiating portion having a plurality of fins provided on one surface of the phosphor wheel, and generating an air flow that circulates from the center side to the outside of the phosphor wheel by rotation of the phosphor wheel by the plurality of fins, a driving portion for rotating the phosphor wheel, an installation portion where the driving portion is installed, a heat receiving member facing the wheel-side heat radiating portion, a heat sink disposed outside the housing and heat transferably connected to the heat receiving member on the side opposite to the phosphor wheel, a plurality of columnar protrusions provided around the installation portion so as to be heat transferable with the heat receiving member and protruding into the housing toward the plurality of fins, Among the plurality of columnar protrusions, a dimension along the protruding direction of at least one columnar protrusion is larger than a dimension in a direction orthogonal to the protruding direction of the at least one columnar protrusion, The plurality of columnar protrusions, a plurality of first columnar protrusions disposed on the installation portion side as viewed from the phosphor wheel, a plurality of second columnar protrusions disposed outside the plurality of first columnar protrusions as viewed from the phosphor wheel, The plurality of first columnar protrusions and the plurality of second columnar protrusions are arranged in a concentric circle centered on the installation portion, The plurality of first columnar protrusions are provided at each first angle centered on the installation portion, The plurality of second columnar protrusions are provided at each second angle centered on the installation portion, The first angle and the second angle are different, and a light source device characterized by this.

2. In the light source device according to Claim 1, Among the plurality of columnar protrusions, at least one columnar protrusion generates a turbulent flow that collides with a surface on the side opposite to the surface with which the air flow collides with respect to the at least one columnar protrusion, and a light source device characterized by this.

3. In the light source device according to Claim 1 or 2, The second angle is smaller than the first angle, and a light source device characterized by this.

4. In the light source device according to any one of Claims 1 to 3, The cross-sectional area of the second columnar protrusion orthogonal to the protruding direction is larger than the cross-sectional area of the first columnar protrusion orthogonal to the protruding direction, and a light source device characterized by this.

5. In the light source device according to any one of Claims 1 to 4, The distance between each of the plurality of second columnar protrusions and the wheel-side heat dissipation part is smaller than the distance between each of the plurality of first columnar protrusions and the wheel-side heat dissipation part. A light source device characterized by this.

6. In the light source device according to any one of Claims 1 to 5, the plurality of second columnar protrusions are arranged corresponding to the region where the phosphor is provided in the phosphor wheel. A light source device characterized by this.

7. In the light source device according to any one of Claims 1 to 6, the heat receiving member has a wiring arrangement part where wiring connected to the driving part is arranged, the plurality of columnar protrusions are provided in a part of the heat receiving member excluding the wiring arrangement part. A light source device characterized by this.

8. A housing, a phosphor wheel having a phosphor for converting the wavelength of incident light and arranged in the housing, a plurality of fins provided on one surface of the phosphor wheel, and by rotation of the phosphor wheel, a wheel-side heat dissipation part that generates an air flow flowing from the center side to the outside of the phosphor wheel by the plurality of fins, a driving part for rotating the phosphor wheel, a heat dissipation member facing the wheel-side heat dissipation part, and comprising: the heat dissipation member has an installation part where the driving part is installed, a heat sink provided on the side opposite to the phosphor wheel with respect to the installation part and arranged outside the housing, a plurality of columnar protrusions provided around the installation part and protruding into the housing toward the plurality of fins, and comprising: among the plurality of columnar protrusions, the dimension along the protruding direction in at least one columnar protrusion is larger than the dimension in the direction orthogonal to the protruding direction in the at least one columnar protrusion, the plurality of columnar protrusions include a plurality of first columnar protrusions arranged on the installation part side when viewed from the phosphor wheel, and a plurality of second columnar protrusions arranged outside the plurality of first columnar protrusions when viewed from the phosphor wheel, the plurality of first columnar protrusions and the plurality of second columnar protrusions are arranged in a concentric shape centered on the installation part, the plurality of first columnar protrusions are provided at every first angle centered on the installation part, the plurality of second columnar protrusions are provided at every second angle centered on the installation part, the second angle is smaller than the first angle. A light source device characterized by this.

9. In the light source device according to any one of Claims 1 to 7, the airflow flowing from the center side to the outside of the phosphor wheel flows through between the plurality of second columnar protrusions and between the plurality of first columnar protrusions via the inner wall of the housing toward the installation portion, and the light source device is characterized by this.

10. A light source device according to any one of Claims 1 to 9, an image forming device that forms image light using the light emitted from the light source device, and a projection optical device that projects the image light formed by the image forming device, and a projector comprising the same.

Images