Light source device and projector

Abstract

The present invention provides a light source device and a projector that achieve improved cooling efficiency and suppress size increase. The light source device comprises: a housing; a phosphor wheel having a phosphor and disposed within the housing; a wheel-side heat dissipation portion having a plurality of fins disposed on the phosphor wheel, wherein rotation of the phosphor wheel generates an airflow flowing from the center of the phosphor wheel to the outside; a drive unit that rotates the phosphor wheel; a heat receiving component having a mounting portion for mounting the drive unit, the heat sink being opposed to the wheel-side heat dissipation portion; a heat sink connected to the heat receiving component on the side opposite to the phosphor wheel and disposed outside the housing; and a plurality of columnar protrusions disposed around the mounting portion and protruding into the housing toward the plurality of fins, wherein at least one columnar protrusion has a larger dimension along the protruding direction than in a direction perpendicular to the protruding direction, and wherein the columnar protrusion on the upstream side of the airflow disperses the airflow toward the other columnar protrusions on the downstream side.

Description

Technical Field

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

[0002] Conventionally, there is known a light source device that includes a phosphor wheel and a housing that houses the phosphor wheel and dissipates heat generated by the phosphor wheel to the outside of the housing (see, for example, Patent Documents 1 and 2).

[0003] In the light source device described in Patent Document 1, a phosphor wheel includes a circular wheel substrate, a phosphor layer disposed on the front of the wheel substrate, and multiple heat sinks disposed on the back of the wheel substrate. Among the multiple heat sinks, the heat sink disposed on the wheel substrate's rotational center side has the best heat dissipation performance, with the heat sink performance decreasing as the location of the heat sink moves away from the rotational center. The housing is provided with multiple fins arranged concentrically around the wheel substrate's rotational center. The multiple fins are nested with the fins of the heat sink. Heat generated in the phosphor layer is transferred to the multiple heat sinks via the wheel substrate, and then to the fins via the fluid between the multiple heat sinks and the fins, where it is dissipated from the housing.

[0004] The light source device described in Patent Document 2 includes a phosphor wheel, a housing for the phosphor wheel device, and a heat sink structure. Heat generated by the phosphors mounted on the phosphor wheel is brought into contact with the heat sink structure via the airflow generated by the rotation of the phosphor wheel. The airflow flows along the fins of the heat sink structure, applying heat to the fins. As a result, the heat generated by the phosphors is dissipated outside the housing for the phosphor wheel device.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-201387

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2016-066061

[0007] However, in the light source device described in Patent Document 1, when the wheel base rotates, heat is transferred from the heat sink to the fins using Taylor vortexes via heat sinks arranged concentrically around the wheel base's rotational center. Therefore, if the wheel base does not rotate at a sufficiently high speed, heat may not be efficiently transferred from the heat sink to the fins.

[0008] Furthermore, in the light source device described in Patent Document 2, since heat dissipation structures are provided on each of the plurality of side surfaces of the housing, there is a problem that the light source device tends to be larger.

[0009] Therefore, a structure of a light source device that can improve cooling efficiency while suppressing an increase in size is desired. Summary of the Invention

[0010] A light source device according to a first embodiment of the present invention comprises: a housing; a fluorescent wheel having a fluorescent body for converting the wavelength of incident light, the fluorescent wheel being arranged in the housing; a wheel-side heat dissipation portion having a plurality of fins provided on one surface of the fluorescent wheel, wherein the plurality of fins generate an airflow flowing from the center side of the fluorescent wheel to the outside as the fluorescent wheel rotates; a driving portion for rotating the fluorescent wheel; a heat receiving component having a mounting portion for mounting the driving portion, the heat receiving component being opposed to the wheel-side heat dissipation portion; and a radiator provided on a side opposite to the fluorescent wheel with respect to the heat receiving component so as to be capable of being dissipated. The heat sink is arranged on the outside of the shell in a manner of heat transfer, and a plurality of columnar protrusions are arranged around the setting portion in a manner capable of heat transfer with the heat-receiving component, and protrude into the shell toward the plurality of fins, the dimension of at least one columnar protrusion along the protruding direction is greater than the dimension of the at least one columnar protrusion in the direction orthogonal to the protruding direction, and the columnar protrusions among the plurality of columnar protrusions that are arranged on the upstream side of the airflow flowing to the plurality of columnar protrusions disperse the airflow toward other columnar protrusions arranged on the downstream side of the airflow.

[0011] A light source device according to a second aspect of the present invention comprises: a housing; a fluorescent wheel having a fluorescent body for converting the wavelength of incident light, the fluorescent wheel being arranged in the housing; a wheel-side heat dissipation portion having a plurality of fins provided on one surface of the fluorescent wheel, wherein the plurality of fins generate an airflow flowing from the center side of the fluorescent wheel to the outside as the fluorescent wheel rotates; a driving portion for rotating the fluorescent wheel; and a heat dissipation component opposed to the wheel-side heat dissipation portion, the heat dissipation component comprising: a setting portion for setting the driving portion; a radiator disposed relative to the setting portion. The portion is arranged on the side opposite to the fluorescent wheel, and the heat sink is arranged on the outside of the shell; and a plurality of columnar protrusions are arranged around the setting portion and protrude into the shell toward the plurality of fins, the dimension of at least one columnar protrusion along the protruding direction is greater than the dimension of the at least one columnar protrusion in the direction orthogonal to the protruding direction, and the columnar protrusions among the plurality of columnar protrusions that are arranged on the upstream side of the airflow flowing to the plurality of columnar protrusions disperse the airflow toward the columnar protrusions arranged on the downstream side of the airflow.

[0012] A projector according to a third aspect of the present disclosure includes: a light source device according to the first aspect or the second aspect; an image forming device that forms image light using 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

[0013] Figure 1 It is a schematic diagram showing the projector according to the first embodiment.

[0014] Figure 2 It is a schematic diagram showing the light source device according to the first embodiment.

[0015] Figure 3 This is a plan view of the phosphor wheel according to the first embodiment as viewed from the incident side of the excitation light.

[0016] Figure 4 This is a plan view of the phosphor wheel and the heat dissipation portion according to the first embodiment as viewed from the side opposite to the incident side of the excitation light.

[0017] Figure 5 It is a perspective view showing the heat dissipation member according to the first embodiment.

[0018] Figure 6 It is a plan view showing the heat dissipation member according to the first embodiment.

[0019] Figure 7 It is a schematic diagram showing the airflow in the storage space of the light source casing according to the first embodiment.

[0020] Figure 8 This is a schematic diagram showing an airflow colliding with one columnar protrusion in the first embodiment.

[0021] Figure 9 This is a plan view of a heat dissipation member of a light source device included in a projector according to a second embodiment, as viewed from the incident side of excitation light.

[0022] Figure 10 It is a schematic diagram showing the airflow in the storage space of the second embodiment.

[0023] Figure 11 This is a plan view of a heat dissipation member of a light source device included in a projector according to a third embodiment, as viewed from the incident side of excitation light.

[0024] Figure 12 This is a diagram schematically showing a cross section of a wavelength converter of a light source device included in a projector according to a fourth embodiment.

[0025] Description of labels

[0026] 1: Projector; 34: Image forming device; 343, 343B, 343G, 343R: Light modulating device; 36: Projection optical device; 4: Light source device; 40: Light source unit; 41: Afocal optical element; 411, 412: Lenses; 42: First phase difference element; 43: Diffuse transmission element; 44: Light separation and synthesis element; 45: Second phase difference element; 46: First light-concentrating element; 461, 462, 463: Lenses; 47: Diffuse optical element; 48: Second light-concentrating element; 481, 482, 483: Lenses; 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 dissipation portion (wheel-side heat dissipation portion); 71: Heat transfer substrate; 72: Fin; 73: Groove portion; 8: Driving portion; 81: Rotating portion; 82: Main body; 9A, 9B, 9C, 9D: Heat dissipation component; 91: Radiator; 92: Heat receiving component; 92A: Surface; 921: Setting portion; 922: Wiring configuration portion; 93A, 93C, 93D: Columnar protrusions; 93A1, 93C1, 93D1: First columnar protrusions; 93A2, 93C2, 93D2: Second columnar protrusions; CA: Housing for light source (housing); FN: Fan; FPC: Wiring. DETAILED DESCRIPTION

[0027] [First embodiment]

[0028] Hereinafter, a first embodiment of the present disclosure will be described based on the drawings.

[0029] [Schematic structure of the projector]

[0030] Figure 1 Schematic diagram showing the configuration of the projector 1 according to this embodiment.

[0031] The projector 1 of this embodiment modulates the light emitted from the light source device 4 to form an image corresponding to the image information, and enlarges and projects the formed image onto a projection surface such as a screen. Figure 1 As shown, the projector 1 includes an outer casing 2 and an image projection device 3. Although not shown in the figure, the projector 1 also 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 objects constituting the projector 1.

[0032] [Structure of the outer casing]

[0033] The exterior casing 2 constitutes the exterior of the projector 1 and houses the image projection device 3 , a power supply device, a control device, and a cooling device therein.

[0034] The exterior case 2 has a front portion 21, a back portion 22, a left side portion 23, and a right side portion 24. Although not shown, the exterior case 2 has a top portion connecting one end of each of the face portions 21 to 24, and a bottom portion connecting the other end of each of the face portions 21 to 24. The exterior case 2 is formed, for example, in a substantially rectangular parallelepiped shape.

[0035] The right side surface portion 24 has an inlet 241. The inlet 241 introduces air outside the exterior casing 2 into the interior of the exterior casing 2. The inlet 241 may be provided with a filter for collecting dust contained in the air passing through the inlet 241.

[0036] The front portion 21 has a passage opening 211 located substantially at the center of the front portion 21. Light projected from a projection optical device 36 described later passes through the passage opening 211.

[0037] The front portion 21 has an exhaust port 212 located on the left side surface 23 side of the front portion 21 .

[0038] The exhaust port 212 discharges the air that has cooled the cooling target provided in the exterior casing 2 to the outside of the exterior casing 2 .

[0039] In the following description, three mutually orthogonal directions are referred to as the +X direction, the +Y direction, and the +Z direction. The +X direction is the direction from the left side of the face 23 toward the right side of the face 24. The +X direction is the direction in which the light source device 4, described later, in the image projection device 3 emits illumination light toward the uniformization device 31. The +Y direction is the direction from the bottom portion toward the top portion. The +Z direction is the direction from the back portion 22 toward the front portion 21. When viewed from the +Y direction, the +Z direction is the direction in which the projection optical device 36, described later, in the image projection device 3 projects image light. Although not shown in the figure, the direction opposite to the +X direction is referred to as the -X direction, the direction opposite to the +Y direction is referred to as the -Y direction, and the direction opposite to the +Z direction is referred to as the -Z direction.

[0040] [Structure of Image Projection Device]

[0041] The image projection device 3 forms an image corresponding 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 uniformization 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.

[0042] Note that the structure of the light source device 4 will be described in detail later.

[0043] The homogenizer 31 homogenizes the light emitted from the light source 4. The homogenized light passes through the color separator 32 and the relay 33, and illuminates the modulation area of ​​the light modulator 343, which will be described later. The homogenizer 31 includes two lens arrays 311 and 312, a polarization conversion element 313, and a superimposing lens 314.

[0044] The color separation device 32 separates the light incident from the uniformization device 31 into red, green, and blue light. 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 .

[0045] The relay device 33 is placed in the optical path of red light, which is longer than the optical paths of other colored lights, to reduce red light loss. The relay device 33 includes an incident-side lens 331, a relay lens 333, and reflectors 332 and 334. In this embodiment, the relay device 33 is placed in the optical path of red light. However, this is not limiting. For example, a configuration may be employed in which the colored light having a longer optical path than the other colored lights is blue light, and the relay device 33 is placed in the optical path of the blue light.

[0046] Image forming device 34 modulates the incident red, green, and blue light and synthesizes the modulated light to form an image. Image forming device 34 includes three field lenses 341, three incident-side polarizing plates 342, three light modulators 343, three viewing angle compensation plates 344, three exit-side polarizing plates 345, and a color synthesizer 346, arranged according to the incident color light.

[0047] The light modulator 343 modulates the light emitted from the light source device 4 according to image information. The three light modulators 343 include a light modulator 343R that modulates red light, a light modulator 343G that modulates green light, and a light modulator 343B that modulates blue light. The light modulators 343 are composed of transmissive liquid crystal panels. The incident-side polarizing plate 342, the light modulator 343, and the outgoing-side polarizing plate 345 form a liquid crystal light valve.

[0048] The color synthesizer 346 synthesizes the three color lights modulated by the light modulators 343B, 343G, and 343R to form an image, and projects the formed image toward the projection optical device 36. In this embodiment, the color synthesizer 346 is formed by a cross dichroic prism, but is not limited to this and may also be formed by, for example, a plurality of dichroic mirrors.

[0049] The optical component housing 35 houses the aforementioned devices 31 to 34. Furthermore, the image projection device 3 has an illumination optical axis Ax, which serves as a design optical axis. The optical component housing 35 holds the devices 31 to 34 at predetermined positions along the illumination optical axis Ax. The light source device 4 and the projection optical device 36 are positioned at predetermined positions along the illumination optical axis Ax.

[0050] The projection optical device 36 is a projection lens that magnifies the image incident from the image forming device 34 and projects it onto the projection surface. In other words, the projection optical device 36 projects light modulated by the light modulating device 343. An example of the projection optical device 36 is a lens assembly having a plurality of lenses and a cylindrical lens barrel that houses the plurality of lenses.

[0051] [Structure of light source device]

[0052] Figure 2 Schematic diagram showing the light source device 4 .

[0053] The light source device 4 emits illumination light for illuminating the light modulating device 343 toward the homogenizing device 31. Figure 2 As shown, the light source device 4 has a light source shell CA, a light source part 40, a telefocus optical element 41, a first phase difference element 42, a diffuse transmission element 43, a light separation and synthesis element 44, a second phase difference element 45, a first focusing element 46, a diffuse optical element 47, a second focusing element 48, a third phase difference element 49 and a wavelength conversion device 5A.

[0054] The light source device 4 is provided with an illumination optical axis Ax1 extending linearly in the −Z direction and an illumination optical axis Ax2 extending linearly in the +X direction and being perpendicular to the illumination optical axis Ax1 .

[0055] The light source unit 40 , the afocal optical element 41 , the first phase difference element 42 , the diffuser and transmissive element 43 , the light separation and combination element 44 , the second phase difference element 45 , the first condenser element 46 , and the diffuser optical element 47 are arranged on the illumination optical axis Ax1 .

[0056] The wavelength converter 5A, the second light converging element 48 , the light separating and combining element 44 , and the third phase difference element 49 are arranged on the illumination optical axis Ax2 .

[0057] [Structure of the light source housing]

[0058] The light source casing CA is equivalent to a housing. The light source casing CA is a sealed housing that accommodates the light source unit 40, the afocal optical element 41, the first phase difference element 42, the diffuser and transmissive element 43, the light separation and synthesis element 44, the second phase difference element 45, the first light converging element 46, the diffuser optical element 47, the second light converging element 48, the third phase difference element 49, and the wavelength converter 5A, and is difficult for dust and the like to enter.

[0059] The light source housing CA has a storage space CA1 and an opening CA2. The storage space CA1 accommodates a portion of the wavelength conversion device 5A. Specifically, the storage space CA1 houses the phosphor wheel 6, the heat dissipation unit 7, the drive unit 8, and the heat receiving component 92 of the heat dissipation component 9A. The opening CA2 is used to accommodate a portion of the wavelength conversion device 5A within the storage space CA1 and is closed by the heat receiving component 92 of the heat dissipation component 9A. When the opening CA2 is closed by the heat dissipation component 9A, the storage space CA1 is sealed.

[0060] [Structure of the light source]

[0061] The light source unit 40 includes a light source 401 that emits blue light in the −Z direction and a plurality of collimating lenses 404 .

[0062] The light source 401 includes a plurality of solid light sources 402 and a supporting member 403 .

[0063] Multiple solid-state light sources 402 are each composed of a semiconductor laser that emits blue light. Specifically, solid-state light sources 402 emit s-polarized blue light BLs in the +Z direction relative to light separation and combination element 44. Alternatively, solid-state light sources 402 may be configured to emit p-polarized blue light BLp relative to light separation and combination element 44. The blue light emitted by the solid-state light sources is, for example, laser light having a peak wavelength of 440 nm. The blue light emitted from multiple solid-state light sources 402 is incident on collimating lens 404.

[0064] The support member 403 supports the plurality of solid light sources 402 arranged in an array on a plane perpendicular to the illumination optical axis Ax1. The support member 403 is a metal member having thermal conductivity.

[0065] The plurality of collimating lenses 404 converts the blue light incident from the plurality of solid light sources 402 into parallel beams. The blue light emitted from the plurality of collimating lenses 404 is incident on the afocal optical element 41.

[0066] In this embodiment, the light source 401 emits s-polarized blue light BLs. However, the present invention is not limited thereto and the light source 401 may emit p-polarized blue light BLp or a mixture of s-polarized and p-polarized blue light. In the latter case, the first phase difference element 42 may be omitted.

[0067] [Structure of afocal optical element]

[0068] The afocal optical element 41 adjusts the beam diameter of the blue light BLs incident in the -Z direction from the light source unit 40. The afocal optical element 41 includes a lens 411 that converges the incident light and a lens 412 that collimates the beam converged by the lens 411.

[0069] Alternatively, the afocal optical element 41 may be omitted.

[0070] [Structure of the First Retardation Element]

[0071] The first phase difference element 42 is disposed between the lens 411 and the lens 412. The first phase difference element 42 converts a portion of the incident blue light BLs, emitting light comprising s-polarized blue light BLs and p-polarized blue light BLp. The first phase difference element 42 can also be rotated by a rotation device about a rotation axis along the illumination optical axis Ax1. 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.

[0072] [Structure of the diffusion transmission element]

[0073] The diffuser transmissive element 43 makes the illumination distribution of the blue light BLp and BLs incident in the -Z direction from the lens 412 uniform. Examples of the diffuser transmissive element 43 include a hologram, a plurality of small lenses arranged on a plane perpendicular to the optical axis, and a roughened surface through which light passes.

[0074] In addition, a beam homogenizer optical element having a pair of multi-lenses may be used instead of the diffusion transmission element 43 .

[0075] [Structure of the light separation and combination element]

[0076] The blue light beams BLs and BLp that have passed through the diffusion and transmission element 43 enter the light separation and combination element 44 .

[0077] The light separating and combining element 44 functions as a light separating element that separates incident light and as a light combining element that combines light incident from two directions. In other words, the light separating and combining element 44 functions as both a light separating element and a light combining element.

[0078] The light separation and combination element 44 is a polarization beam splitter that separates the s-polarized light component and the p-polarized light component included in the incident light. Specifically, the light separation and combination element 44 reflects the s-polarized light component and transmits the p-polarized light component. Furthermore, the light separation and combination element 44 has a color separation characteristic that transmits light with a wavelength above a predetermined wavelength, regardless of whether it is the s-polarized light component or the p-polarized light component. Therefore, of the blue light BLp and BLs incident on the light separation and combination element 44 from the diffuse transmission element 43, the p-polarized blue light BLp transmits the light separation and combination element 44 in the -Z direction and enters the second phase difference element 45. On the other hand, the s-polarized blue light BLs is reflected by the light separation and combination element 44 in the -X direction and enters the second focusing element 48.

[0079] Alternatively, the light separation and combination element 44 may function as a half mirror that transmits a portion of the light incident from the light source unit 40 via the diffuser / transmitter element 43 and reflects the remaining light, and as a dichroic mirror that reflects the blue light incident from the diffuser optical element 47 and transmits light incident from the wavelength converter 5A and having a wavelength longer than that of the blue light. In this case, the first phase difference element 42 may be omitted.

[0080] [Structure of the Second Phase Difference Element]

[0081] The second phase difference element 45 is positioned in the -Z direction relative to the light separation and combination element 44. Specifically, the second phase difference element 45 is positioned between the light separation and combination element 44 and the first light converging element 46. The second phase difference element 45 converts the blue light BLp that has passed through the light separation and combination element 44 into circularly polarized blue light BLc. The blue light BLc that has passed through the second phase difference element 45 in the -Z direction enters the first light converging element 46.

[0082] [Structure of the First Concentrating Element]

[0083] The first light converging element 46 converges the blue light BLc incident from the second phase difference element 45 in the -Z direction after passing through the light separation and combination element 44, onto the optical diffuser 47. Furthermore, the first light converging element 46 collimates the light incident from the optical diffuser 47 in the +Z direction and emits the collimated light toward the second phase difference element 45.

[0084] In this embodiment, the first light concentrating element 46 is composed of three lenses 461 , 462 , and 463 . However, the number of lenses constituting the first light concentrating element 46 is not limited.

[0085] [Structure of the diffusion optical element]

[0086] The optical diffuser 47 diffuses the incident blue light BLc at the same diffusion angle as the fluorescence YL emitted from the wavelength converter 5A. Specifically, the optical diffuser 47 reflects the blue light BLc incident from the first light converging element 46 in the -Z direction toward the +Z direction, thereby diffusing the light. The optical diffuser 47 is a reflective element that causes the incident blue light BLc to undergo Lambertian reflection. Furthermore, the optical diffuser 47 can be rotated by a rotating device about an axis parallel to the illumination optical axis Ax1.

[0087] After being diffused by the optical diffuser 47, the blue light BLc passes through the first light concentrating element 46 and then enters the second phase difference element 45. Upon reflection from the optical diffuser 47, the blue light BLc entering the optical diffuser 47 is converted into circularly polarized light with an opposite rotational direction. Consequently, the blue light BLc entering the second phase difference element 45 via the first light concentrating element 46 is converted by the second phase difference element 45 into s-polarized blue light BLs. The blue light BLs is then reflected in the +X direction by the light separation and combination element 44 and enters the third phase difference element 49.

[0088] [Structure of the Second Concentrating Element]

[0089] The second light converging element 48 converges the blue light BLs reflected in the −X direction by the light separating and combining element 44 toward the wavelength converter 5A. Furthermore, the second light converging element 48 collimates the fluorescence YL incident in the +X direction from the wavelength converter 5A and emits the collimated fluorescence YL toward the light separating and combining element 44.

[0090] In this embodiment, the second light concentrating element 48 is composed of three lenses 481 , 482 , and 483 , but the number of lenses constituting the second light concentrating element 48 is not limited.

[0091] [Schematic Structure of Wavelength Converter]

[0092] The wavelength converter 5A converts the wavelength of the blue light BLs incident from the second light converging element 48 .

[0093] Specifically, the wavelength converter 5A emits fluorescent light YL having a wavelength longer than that of the incident blue light BLs. Specifically, the wavelength converter 5A is a reflective wavelength conversion element that emits the fluorescent light YL toward the incident side of the blue light BLs. The blue light BLs incident on the wavelength converter 5A corresponds to the excitation light or light in the first wavelength band, while the fluorescent light YL corresponds to the converted light or light in the second wavelength band. The structure of the wavelength converter 5A will be described in detail later.

[0094] The fluorescent light YL emitted from the wavelength converter 5A in the +X direction is collimated by the second light converging element 48 and then enters the light separating and combining element 44. As described above, the light separating and combining element 44 has the property of transmitting the fluorescent light YL. Therefore, the fluorescent light YL incident on the light separating and combining element 44 in the +X direction passes through the light separating and combining element 44 and enters the third phase difference element 49. In other words, the light incident on the third phase difference element 49 from the light separating and combining element 44 is white light containing a mixture of blue light BLs and fluorescent light YL.

[0095] [Structure of the Third Retardation Element]

[0096] The third phase difference element 49 converts the white light including the blue light BLs and the fluorescence YL incident from the light separation and combination element 44 into a mixture of s-polarized and p-polarized white light. The converted white light is emitted in the +X direction as illumination light LT and enters the homogenizer 31.

[0097] [Detailed Structure of Wavelength Converter]

[0098] like Figure 2 As shown, the wavelength conversion device 5A includes a phosphor wheel 6, a heat sink 7, a drive unit 8, and a heat sink 9A. The phosphor wheel 6, the heat sink 7, the drive unit 8, and a portion of the heat sink 9A are disposed in the housing space CA1.

[0099] In the following description, the blue light BLs incident on the wavelength converter 5A from the second light converging element 48 is referred to as excitation light.

[0100] [Structure of the phosphor wheel]

[0101] Figure 3 This is a plan view of the fluorescent wheel 6 as viewed from the incident side of the excitation light.

[0102] The fluorescent wheel 6 is arranged on the second light converging element 48 side relative to the driving unit 8, and is rotated by the driving unit 8 about a rotation axis Rx substantially parallel to the illumination optical axis Ax2. Figure 3 As shown, the phosphor wheel 6 is a wavelength conversion element including a phosphor layer 61 , a reflective layer 62 , and a support substrate 63 .

[0103] The phosphor layer 61 converts the wavelength of the incident excitation light. The phosphor layer 61 contains phosphor particles, which are excited by the incident excitation light and emit fluorescent light YL having a wavelength longer than that of the incident excitation light. In other words, the phosphor layer 61 acts as a phosphor. Fluorescent light YL, for example, has a peak wavelength of 500 nm to 700 nm. Specifically, fluorescent light YL includes green and red light. When viewed from the side where the excitation light is incident, the phosphor layer 61 is formed into a ring centered on the rotation axis Rx of the support substrate 63.

[0104] The reflective layer 62 is provided between the phosphor layer 61 and the support substrate 63. The reflective layer 62 reflects light incident from the phosphor layer 61. Alternatively, the reflective layer 62 may constitute the first surface 63A of the support substrate 63.

[0105] The support substrate 63 is a disk-shaped substrate that supports the fluorescent layer 61 and the reflective layer 62. The support substrate 63 has a first surface 63A serving as a surface on the incident side of the excitation light and a fitting hole 631 provided in the center of the support substrate 63.

[0106] The fluorescent layer 61 and the reflective layer 62 are arranged on the first surface 63A. That is, the first surface 63A is a surface that supports the fluorescent layer 61 and the reflective layer 62.

[0107] A portion 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 supporting substrate 63 is rotated about the rotation axis Rx by the driving unit 8 .

[0108] Figure 4 This is a plan view of the fluorescent wheel 6 and the heat dissipation portion 7 as viewed from the side opposite to the incident side of the excitation light. Figure 4 In the figure, for ease of viewing, only some of the fins 72 and the grooves 73 included in the heat dissipation portion 7 are denoted by reference numerals.

[0109] like Figure 4 As shown, the support substrate 63 includes a second surface 63B that is a surface opposite to the first surface 63A, and a connection portion 632 .

[0110] The connection portion 632 is a portion in the center of the second surface 63B. A portion of the driving unit 8 is connected to the connection portion 632 .

[0111] [Structure of the heat dissipation unit]

[0112] The heat dissipation portion 7 corresponds to the wheel-side heat dissipation portion. The heat dissipation portion 7 is provided in an annular shape on the second surface 63B, outside the connection portion 632. The heat dissipation portion 7 is connected to the second surface 63B of the support substrate 63 in a heat-transferable manner, dissipating heat transferred from the phosphor layer 61 via the support substrate 63. Specifically, the heat dissipation portion 7 transfers heat transferred from the phosphor layer 61 to the gas circulated by the rotation of the phosphor wheel 6, thereby cooling the phosphor layer 61.

[0113] The heat dissipation portion 7 includes a heat transfer substrate 71 , a plurality of fins 72 , and a plurality of grooves 73 provided between the plurality of fins 72 .

[0114] The heat transfer substrate 71 is an annular substrate formed of a metal with high thermal conductivity such as aluminum. The heat transfer substrate 71 is attached to the second surface 63B outside the connection portion 632 and transfers heat transferred from the second surface 63B to the plurality of fins 72 .

[0115] A plurality of fins 72 extend from the heat transfer substrate 71 toward the side opposite to the side on which the excitation light enters the wavelength conversion device 5A. The fins 72 are arranged at approximately equal intervals along the +D1 direction, the direction of rotation of the phosphor wheel 6. Specifically, the fins 72 extend in an arc shape from a base point BP, which is set at approximately equal intervals along the +D1 direction, 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 fins 72 extend in an arc shape in the -D1 direction, the direction opposite to the +D1 direction, as they extend from the base point BP toward the outer edge 7T.

[0116] When the phosphor wheel 6 having such a heat dissipation portion 7 is rotated by the driving unit 8, an airflow is generated that flows from the center side of the second surface 63B toward the outside through the groove portion 73. As the airflow flows through the groove portion 73, it contacts the fins 72 that sandwich the groove portion 73 in the +D1 direction, transferring heat from the fins 72 to the airflow. This cools the fins 72, and in turn, cools the phosphor layer 61.

[0117] The airflow generated by the rotation of the fluorescent wheel 6 flows toward the heat sink 9A provided at a position opposite to the plurality of fins 72. The heat of the airflow is thereby transferred to the heat sink 9A, which is then dissipated outside the light source housing CA.

[0118] [Structure of the drive unit]

[0119] The driving unit 8 rotates the support substrate 63 in the +D1 direction about the rotation axis Rx, thereby rotating the fluorescent wheel 6 in the +D1 direction. The driving unit 8 includes a rotating unit 81 that rotates about the rotation axis Rx and a main body 82 that rotates the rotating unit 81.

[0120] The rotating portion 81 is arranged relative to the main body 82 on the incident side of the excitation light with respect to the wavelength conversion device 5A. Figure 3 As shown, the rotating portion 81 is fixed to the support base plate 63 in a state in which a portion of the rotating portion 81 is fitted into the fitting hole 631 .

[0121] The main body 82 includes a motor for rotating the rotating portion 81. The main body 82 is provided on the heat dissipation member 9A.

[0122] By rotating the phosphor wheel 6 using the driving unit 8, the excitation light is prevented from continuously entering a single point in the phosphor layer 61. This not only suppresses a decrease in wavelength conversion efficiency in the phosphor layer 61, but also cools the phosphor wheel 6 by the airflow generated by the rotation of the phosphor wheel 6.

[0123] [Structure of heat dissipation components]

[0124] Figure 5 It is a perspective view showing the heat dissipation member 9A.

[0125] The heat sink 9A receives heat generated by the phosphor layer 61 via the airflow generated by the rotation of the phosphor wheel 6, and dissipates the received heat outside the light source housing CA. The heat sink 9A is positioned within the light source housing CA opposite the heat sink 7. Specifically, the heat sink 9A is positioned on the side of the phosphor wheel 6 and heat sink 7 opposite to the side on which the excitation light is incident, and is fixed in a position to close the aforementioned opening CA2.

[0126] like Figure 5 As shown, the heat dissipation component 9A includes a heat sink 91, a heat receiving component 92, and a plurality of columnar protrusions 93A. The heat receiving component 92 and the plurality of columnar protrusions 93A may be integrally formed by integral molding, or the heat sink 91, the heat receiving component 92, and the plurality of columnar protrusions 93A may all be integrally formed by integral molding. Alternatively, the heat sink 91, the heat receiving component 92, and the plurality of columnar protrusions 93A may be integrally formed by connecting them.

[0127] [Structure of Radiator]

[0128] The heat sink 91 acts as a heat dissipation portion on the heat dissipation component side, dissipating heat transferred via the heat receiving component 92. When the wavelength conversion device 5A is mounted in the light source housing CA, the heat sink 91 is positioned outside the light source housing CA. Therefore, heat transferred to the heat sink 91 via the heat receiving component 92 is dissipated outside the light source housing CA.

[0129] Although not shown in the figure, a fan FN constituting the aforementioned cooling device is provided outside the light source housing CA, and the cooling air within the outer casing 2 is circulated through the fan FN to the radiator 91. The cooling air, having transferred heat from the radiator 91, is discharged to the outside of the outer casing 2 through the exhaust port 212.

[0130] [Structure of heat-receiving parts]

[0131] Figure 6 It is a plan view of the heat dissipation member 9A as viewed from the incident side of the excitation light with respect to the wavelength conversion device 5A.

[0132] The heat receiving member 92 is a substantially rectangular plate-shaped body, which is equivalent to the heat receiving member. Figure 2 As shown in FIG. 1 , the heat receiving member 92 closes the opening CA2 and substantially seals the storage space CA1. The heat receiving member 92 receives heat from the airflow generated by the rotation of the fluorescent wheel 6 and transfers the received heat to the heat sink 91. Figure 5 as well as Figure 6 As shown, the heat receiving member 92 includes a setting portion 921 and a wiring arrangement portion 922 which are arranged on a surface 92A of the heat receiving member 92 on the side of the heat radiating portion 7 .

[0133] like Figure 5 and Figure 6 As shown, the installation portion 921 is provided substantially at the center of the surface 92A of the heat receiving member 92 on the phosphor wheel 6 side. The main body 82 of the driving unit 8 is provided in the installation portion 921. Specifically, the installation portion 921 is a substantially circular recessed portion that is recessed toward the side opposite to the phosphor wheel 6, and the main body 82 is embedded in the installation portion 921.

[0134] The wiring arrangement portion 922 is a flat portion extending in one direction from the installation portion 921 toward the outside of the heat receiving member 92. The wiring arrangement portion 922 has a wiring FPC connected to the driving unit 8 arranged in the installation portion 921.

[0135] In the present embodiment, the wiring FPC is formed of a flexible printed circuit board, but may be another wiring component such as a cable.

[0136] [Structure of columnar protrusions]

[0137] The airflow generated by the rotation of the fluorescent wheel 6 flows through the plurality of columnar protrusions 93A, and the plurality of columnar protrusions 93A transfers the heat received from the flowing airflow to the heat receiving member 92 .

[0138] The plurality of columnar protrusions 93A are arranged around the setting portion 921 in a manner that enables heat transfer with the heat receiving component 92. Specifically, the plurality of columnar protrusions 93A are arranged around the setting portion 921 on the surface 92A and avoid the wiring arrangement portion 922. In other words, the plurality of columnar protrusions 93A are provided in a portion of the surface 92A of the heat receiving component 92 other than the wiring arrangement portion 922. The plurality of columnar protrusions 93A protrude from the surface 92A toward the plurality of fins 72 of the heat dissipation portion 7 into the light source housing CA. In this embodiment, the plurality of columnar protrusions 93A rise from the surface 92A in a generally truncated cone shape.

[0139] Specifically, the plurality of columnar protrusions 93A are arranged on concentric circles centered on the mounting portion 921. In this embodiment, a plurality of reference circles CR1, CR2, and CR3 are defined on the surface 92A as concentric circles centered on the mounting portion 921 and spaced approximately equally apart. The plurality of columnar protrusions 93A are arranged on the plurality of reference circles CR1, CR2, and CR3. Reference circles CR1 to CR3 are imaginary concentric circles, with reference circle CR1 being the innermost reference circle and reference circle CR3 being the outermost reference circle.

[0140] The plurality of columnar protrusions 93A are provided on each of the reference circles CR1 to CR3 at equal intervals in the +D2 direction, which is the circumferential direction centered on the installation portion 921. Specifically, the plurality of columnar protrusions 93A are provided on each of the reference circles CR1 to CR3 at intervals of 20° in the +D2 direction.

[0141] Furthermore, the phase of the arrangement period of the columnar protrusions 93A in the odd-numbered reference circles CR1 and CR3 and the phase of the arrangement period of the columnar protrusions 93A in the even-numbered reference circle CR2 are shifted from each other.

[0142] In this embodiment, assuming that the imaginary straight line connecting the setting portion 921 (e.g., the center CT of the setting portion 921) and one of the plurality of columnar protrusions 93A arranged on the reference circle CR1 is the reference line SL1, the lines are arranged at intervals of 20° from the reference line SL1 in the +D2 direction on the odd-numbered reference circles CR1 and CR3. Similarly, assuming that the imaginary straight line connecting the setting portion 921 (e.g., the center CT of the setting portion 921) and one of the plurality of columnar protrusions 93A arranged on the reference circle CR2 is the reference line SL2, the lines are arranged at intervals of 20° from the reference line SL2 in the +D2 direction on the even-numbered reference circle CR2. Furthermore, the intersection angle α between the reference line SL1 and the closest reference line SL2 to the reference line SL1 in the +D2 direction is 10°.

[0143] Thus, in this embodiment, the phases of the arrangement periods of the plurality of columnar protrusions 93A are shifted between the odd-numbered reference circles and the even-numbered reference circles. This phase shift makes it easier for the airflow flowing along the surface 92A to collide with the columnar protrusions 93A, and the heat of the airflow is easily transferred to the columnar protrusions 93A.

[0144] Furthermore, the outer diameters of the plurality of columnar protrusions 93A are the same within reference circles CR1 to CR3 in which the columnar protrusions 93A are provided. Furthermore, although not shown in the figure, in this embodiment, the height of the columnar protrusions 93A in the direction in which the columnar protrusions 93A rise from the surface 92A is at least twice the outer diameter of the columnar protrusions 93A.

[0145] It can be said that the plurality of columnar protrusions 93A include a plurality of first columnar protrusions arranged on the installation portion 921 side when viewed from the phosphor wheel 6, and a plurality of second columnar protrusions arranged outside the plurality of first columnar protrusions when viewed from the phosphor wheel 6. The plurality of first columnar protrusions may be exemplified by the plurality of columnar protrusions 93A arranged on the reference circle CR1 set on the installation portion 921 side, and the plurality of second columnar protrusions may be exemplified by the plurality of columnar protrusions 93A arranged on reference circles CR2 and CR3 set outside the installation portion 921 relative to reference circle CR1.

[0146] [Airflow generated by the rotation of the fluorescent wheel in the storage space]

[0147] Figure 7 Schematic diagram showing the airflow AF in the accommodation space CA1 of the light source casing CA.

[0148] The airflow AF generated when the fluorescent wheel 6 is rotated by the driving unit 8 will be described.

[0149] When the fluorescent wheel 6 rotates, Figure 7 As shown, airflow is generated by a plurality of fins 72 constituting the heat sink 7, which is provided on the side opposite to the incident side of the excitation light relative to the phosphor wheel 6. The main airflow generated by the plurality of fins 72 is the airflow AF that flows from the center of the phosphor wheel 6 toward the outside. Other airflows (not shown) are airflows that flow from the phosphor wheel 6 toward the heat sink 9A.

[0150] The air flow AF flows from the center of the fluorescent wheel 6 toward the outside along the grooves 73 while transferring heat from the fins 72. The air flow AF corresponds to the first air flow.

[0151] The airflow AF collides with inner wall CA11, which intersects the direction of the airflow AF's flow, within the inner walls of the storage space CA1 and flows along inner wall CA11 toward the heat receiving component 92. The airflow AF flowing toward the heat receiving component 92 flows along surface 92A of the heat receiving component 92, from the outside toward the center. Because surface 92A is provided with a plurality of columnar protrusions 93A, the airflow AF flowing along surface 92A collides with these protrusions and flows toward the mounting portion 921 located in the center of surface 92A. The airflow AF then flows along the drive unit 8 located in mounting portion 921 toward the phosphor wheel 6, reaching the center of the second surface 63B of the support substrate 63 that forms the phosphor wheel 6. The airflow AF then passes through the plurality of fins 72, flowing again from the center of the phosphor wheel 6 toward the outside, along the plurality of grooves 73.

[0152] Figure 8 Schematic diagram showing the airflow AF colliding with one columnar protrusion 93A.

[0153] Here, if Figure 8 As shown, the airflow AF that collides with one of the multiple columnar protrusions 93A splits into two, each flowing toward the other columnar protrusions 93A. Specifically, the columnar protrusion 93A disperses the airflow AF1 (first airflow) flowing toward the columnar protrusion 93A, generated by the rotation of the phosphor wheel 6, into multiple airflows AF2 (second airflows) flowing toward the other columnar protrusions 93A. This facilitates the airflow AF to flow through each of the multiple columnar protrusions 93A, thereby promoting heat exchange between each columnar protrusion 93A and the airflow AF, and facilitating heat transfer from the airflow AF to the columnar protrusions 93A.

[0154] In addition, if Figure 8 As shown, when a columnar protrusion 93A disperses the airflow AF1 flowing through that columnar protrusion 93A into the airflow AF2 flowing through another columnar protrusion 93A, it generates an entrained airflow AF3 on the surface of that columnar protrusion 93A opposite the surface where it collides with the airflow. In other words, turbulence is generated on the side of each columnar protrusion 93A opposite the side where it collides with the airflow AF1. This increases the contact area between columnar protrusion 93A and the airflow, thereby promoting heat exchange between columnar protrusion 93A and the airflow AF and facilitating heat transfer from the airflow AF to columnar protrusion 93A.

[0155] As described above, the heat transferred to the columnar protrusions 93A is transferred to the heat sink 91 via the heat receiving member 92. Furthermore, the heat transferred to the heat sink 91 is dissipated outside the light source housing CA, thereby reducing the temperature in the housing space CA1, that is, the temperature of the gas flowing to the heat dissipation portion 7 provided in the phosphor wheel 6.

[0156] Furthermore, in order to allow the airflow generated when the phosphor wheel 6 rotates to efficiently flow toward the heat receiving component 92 after colliding with the inner wall CA11 of the storage space CA1 and circulate within the storage space CA1, it is preferred that the distance between the inner wall CA11 of the storage space CA1 and the outer periphery of the plurality of fins 72 provided on the phosphor wheel 6 be a predetermined distance.

[0157] According to the inventors' research, the distance from the rotation axis Rx of the fluorescent 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 keeping the distance from the rotation axis Rx to the outer edge of the fin 72 within this range, the airflow AF can be efficiently circulated between the heat sink 7 (which serves as the wheel-side heat sink) and the heat sink member 9A.

[0158] [Effects of the First Embodiment]

[0159] The projector 1 according to the present embodiment described above provides the following effects.

[0160] The projector 1 includes a light source device 4 , an image forming device 34 that forms image light using 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 .

[0161] The light source device 4 includes a light source housing CA, a phosphor wheel 6, a heat sink 7, a drive unit 8, a heat sink 91, a heat receiving member 92, and a plurality of columnar protrusions 93A. The light source housing CA corresponds to the housing. The phosphor wheel 6 includes a phosphor layer 61 that converts the wavelength of incident light and is disposed within a housing space CA1 of the light source housing CA. The phosphor layer 61 corresponds to the phosphor. The heat sink 7 corresponds to the wheel-side heat sink. The heat sink 7 includes a plurality of fins 72 disposed 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. As the phosphor wheel 6 rotates, the heat sink 7 generates airflow from the center of the phosphor wheel 6 to the outside using the plurality of fins 72. The drive unit 8 rotates the phosphor wheel 6. The heat receiving member 92 includes a mounting portion 921 for mounting the drive unit 8. The heat receiving member 92 is disposed opposite the heat sink 7. The heat receiving member 92 corresponds to the heat receiving member. The heat sink 91 is connected to the side of the heat receiving component 92 opposite to the phosphor wheel 6 in a heat transfer manner. The heat sink 91 is arranged on the outside of the light source housing CA. A plurality of columnar protrusions 93A are arranged around the installation portion 921 in a manner that allows heat transfer to the heat receiving component 92. The plurality of columnar protrusions 93A protrude into the storage space CA1 of the light source housing CA toward the plurality of fins 72. The dimension of each of the plurality of columnar protrusions 93A 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 arranged on the upstream side of the airflow flowing through the plurality of columnar protrusions 93A disperse the airflow toward the other columnar protrusions 93A arranged on the downstream side of the airflow.

[0162] With this structure, when the phosphor wheel 6 is rotated by the driving unit 8, an airflow is generated from the center of the phosphor wheel 6 toward the outside via the plurality of fins 72 included in the heat dissipation unit 7. At this time, heat from the phosphor wheel 6, that is, heat generated by the phosphor layer 61, is transferred from the plurality of fins 72 to the airflow, thereby cooling the phosphor layer 61.

[0163] Furthermore, the airflow generated by the rotation of the phosphor wheel 6 flows toward the heat receiving member 92, which is positioned opposite the heat dissipation portion 7. A plurality of columnar protrusions 93A are provided around the mounting portion 921 of the heat receiving member 92, projecting into the light source housing CA toward the plurality of fins 72. The columnar protrusions 93A are connected to the heat receiving member 92 in a heat transferable manner. Therefore, heat received by the columnar protrusions 93A is transferred to the heat sink 91 via the heat receiving member 92 and dissipated to the exterior of the light source housing CA. This reduces the temperature within the housing space CA1 of the light source housing CA and the temperature of the airflow flowing toward the plurality of fins 72, thereby improving the cooling efficiency of the phosphor layer 61 of the phosphor wheel 6.

[0164] Furthermore, the heat-receiving component 92 is positioned opposite the heat dissipation portion 7. Multiple columnar protrusions 93A, which are connected to the heat sink 91 via the heat-receiving component 92 in a heat-transferable manner, protrude toward the multiple fins 72. The heat sink 91 is connected to the heat-receiving component 92 on the side opposite the phosphor wheel 6 in a heat-transferable manner. Therefore, other than the heat sink 91, the structure protruding toward the outside of the light source housing CA can be reduced. This can prevent the light source device 4 from becoming larger than a structure in which heat sinks are provided on multiple side surfaces of the light source housing CA.

[0165] Therefore, it is possible to improve the cooling efficiency of the light source device 4 and suppress an increase in size.

[0166] In the light source device 4 , each of the plurality of columnar projections 93A generates a turbulent flow (airflow AF3 ), and the turbulent flow (airflow AF3 ) collides with the surface of the columnar projection 93A opposite to the surface collided with by the airflow.

[0167] This structure increases the contact area of ​​columnar projections 93A with the airflow heated by heat flowing through heat dissipation section 7 . This promotes heat transfer from the airflow to columnar projections 93A, improving the cooling efficiency of phosphor layer 61 .

[0168] In light source device 4 , heat receiving member 92 includes wiring arrangement portion 922 for arranging wiring FPC connected to drive unit 8 . Plural columnar projections 93A are provided on surface 92A of heat receiving member 92 except wiring arrangement portion 922 .

[0169] This configuration can prevent the wiring FPC connected to the drive unit 8 from coming into contact with the columnar projections 93A to which the heat of the phosphor layer 61 is transferred via the airflow.

[0170] The light source device 4 includes a light source housing CA, a phosphor wheel 6, a heat sink 7, a drive unit 8, and a heat sink component 9A. The light source housing CA corresponds to the housing. The phosphor wheel 6 includes 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 housing space CA1 of the light source housing CA. The heat sink 7 corresponds to the wheel-side heat sink. The heat sink 7 includes a plurality of fins 72 disposed 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. As the phosphor wheel 6 rotates, the heat sink 7 generates airflow from the center of the phosphor wheel 6 to the outside using the plurality of fins 72. The drive unit 8 rotates the phosphor wheel 6. The heat sink component 9A faces the heat sink 7. The heat sink component 9A includes a mounting portion 921, a heat sink 91, and a plurality of columnar protrusions 93A. The mounting portion 921 is used to mount the drive unit 8. The heat sink 91 is located on the side of the mounting portion 921 opposite the phosphor wheel 6 and is disposed outside the light source housing CA. A plurality of columnar protrusions 93A are disposed around the mounting portion 921, protruding into the housing space CA1 of the light source housing CA toward the plurality of fins 72. The dimension of the plurality of columnar protrusions 93A along the protruding direction is larger than the dimension in a direction perpendicular to the protruding direction. Among the plurality of columnar protrusions 93A, columnar protrusions 93A disposed upstream of the airflow flowing through the plurality of columnar protrusions 93A disperse the airflow toward the columnar protrusions 93A disposed downstream of the airflow.

[0171] According to such a structure, the above-mentioned effects can be achieved.

[0172] [Second embodiment]

[0173] Next, a second embodiment of the present disclosure will be described.

[0174] The projector of this embodiment has the same structure as the projector 1 of the first embodiment, but the structure of the multiple columnar protrusions provided on the heat receiving member constituting the heat dissipation member is different. In addition, in the following description, the same or substantially the same parts as those already described are marked with the same reference numerals and the description thereof is omitted.

[0175] [Schematic Structure of Projector and Light Source Device]

[0176] Figure 9 This is a plan view of a heat dissipation member 9B of a light source device included in the projector according to the present embodiment, as viewed from the incident side of excitation light.

[0177] The projector of this embodiment has a second wavelength converter 5A instead of the wavelength converter 5A of the first embodiment. Figure 9The projector 1 of the first embodiment has the same structure and function as the projector 1 of the first embodiment, except for the wavelength converter 5B shown. That is, the light source device of this embodiment has the same structure and function as the light source device 4 of the first embodiment, except for the wavelength converter 5B replacing the wavelength converter 5A.

[0178] The wavelength converter 5B has the same structure and function as the wavelength converter 5A except that it includes the heat sink 9B instead of the heat sink 9A. Specifically, the wavelength converter 5B includes the phosphor wheel 6, the heat sink 7, the drive unit 8, and the heat sink 9B.

[0179] [Structure of heat dissipation components]

[0180] The heat dissipation component 9B is similar to the heat dissipation component 9A of the first embodiment and includes a heat sink 91, a heat receiving component 92, and a plurality of columnar protrusions 93A. Figure 9 As shown, the arrangement of the plurality of columnar protrusions 93A is different from the arrangement of the plurality of columnar protrusions 93A in the heat dissipation member 9A.

[0181] Specifically, similar to the plurality of columnar protrusions 93A of the first embodiment, the plurality of columnar protrusions 93A of the heat dissipating member 9B are provided around the mounting portion 921 so as to enable heat transfer with the surface 92A of the heat receiving member 92. These protrusions protrude into the housing space CA1 of the light source housing CA, toward the plurality of fins 72 of the heat dissipating portion 7. Furthermore, the plurality of columnar protrusions 93A are heated within the housing space CA1 by the airflow AF generated by the plurality of fins 72 as the phosphor wheel 6 rotates, and the heat is transferred to the heat sink 91 via the heat receiving member 92.

[0182] In heat sink 9B, surface 92A is defined with a plurality of reference circles CR1 to CR6, which are concentric circles spaced approximately equally apart and centered around mounting portion 921. Reference circles CR1 to CR6 are imaginary concentric circles, and are defined in order from mounting portion 921 outward.

[0183] The plurality of columnar protrusions 93A are provided at equal intervals in the circumferential direction (+D2 direction) around the installation portion 921 in each of the reference circles CR1 to CR6 .

[0184] Specifically, columnar protrusions 93A1 arranged on reference circles CR1 to CR3 on the side of mounting portion 921 are arranged at intervals of a first angle centered on mounting portion 921. In this embodiment, the first angle is 30°, and the columnar protrusions 93A arranged on reference circles CR1 to CR3 are referred to as first columnar protrusions 93A1. Furthermore, the arrangement period of the first columnar protrusions 93A1 arranged on reference circles CR1 and CR3 is phase-shifted by 15° from the arrangement period of the first columnar protrusions 93A1 arranged on reference circle CR2. This phase shift angle is half the angle of the arrangement of the first columnar protrusions 93A1 centered on mounting portion 921 on each of reference circles CR1 to CR3. The first angle is an angle formed by a straight line connecting the centers of reference circles CR1 to CR3, which also serve as the center of the installation portion 921, and one first columnar protrusion 93A1, and a straight line connecting the centers of reference circles CR1 to CR3 and a first columnar protrusion 93A1 adjacent to the one first columnar protrusion 93A1.

[0185] The columnar protrusions 93A arranged on reference circles CR4-CR6 outside the installation portion 921 are arranged at a second angle centered on the installation portion 921. In this embodiment, the second angle is 15°, and the columnar protrusions 93A arranged on reference circles CR4-CR6 are second columnar protrusions 93A2. Furthermore, the arrangement period of the second columnar protrusions 93A2 arranged on reference circles CR4-CR6 is aligned in phase. The second angle is the angle formed by a straight line connecting the center of reference circles CR4-CR6, which also serves as the center of the installation portion 921, and a second columnar protrusion 93A2, and a straight line connecting the center of reference circles CR4-CR6 and a second columnar protrusion 93A2 adjacent to the second columnar protrusion 93A2.

[0186] Thus, 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 when viewed from the phosphor wheel 6, and a plurality of second columnar protrusions 93A2 disposed outward of the plurality of first columnar protrusions 93A1 when viewed from the phosphor wheel 6. The angle (first angle) at which the first columnar protrusions 93A1 are disposed with respect to the installation portion 921 differs from the angle (second angle) at which the second columnar protrusions 93A2 are disposed with respect to the installation portion 921. Specifically, the second angle is smaller than the first angle.

[0187] Figure 10 Schematically shows a cross section of the wavelength conversion device 5B. Figure 10 It is a schematic diagram showing the airflow AF in the accommodation space CA1.

[0188] In addition, if Figure 10As shown, the plurality of second columnar protrusions 93A2 are provided corresponding to the area where the phosphor layer 61 of the phosphor wheel 6 is provided. Specifically, when the wavelength conversion device 5B is viewed from the incident side of the excitation light, the plurality of second columnar protrusions 93A2 are provided corresponding to the area where the phosphor layer 61 is provided. Furthermore, the plurality of fins 72 are arranged on the second surface 63B of the support substrate 63 so as to include the area corresponding to the phosphor layer 61 provided on the first surface 63A.

[0189] In a light source device equipped with such a heat sink 9B, when the phosphor wheel 6 rotates, the plurality of fins 72 provided on the phosphor wheel 6 generate an airflow AF that primarily flows from the center of the phosphor wheel 6 toward the outside. Similar to the first embodiment, the airflow AF flows along the inner wall CA11 of the storage space CA1 toward the heat receiving component 92, which faces the plurality of fins 72. The airflow AF that has flowed into the heat receiving component 92 collides with the plurality of second columnar protrusions 93A2 and the plurality of first columnar protrusions 93A1, and then flows along the surface 92A between the plurality of second columnar protrusions 93A2 and between the plurality of first columnar protrusions 93A1 toward the installation portion 921. During this process, heat is transferred from the airflow AF to the plurality of columnar protrusions 93A. The airflow AF, cooled by flowing between the plurality of columnar protrusions 93A, is then drawn into the plurality of fins 72.

[0190] [Effects of the Second Embodiment]

[0191] The projector according to the present embodiment described above can achieve the following effects in addition to the same effects as those of the projector 1 according to the first embodiment.

[0192] In the light source device of this 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 .

[0193] Here, when the airflow AF generated by the plurality of fins 72 flows along the heat receiving member 92 as the fluorescent wheel 6 rotates, the airflow AF flows from the outside of the heat receiving member 92 toward the installation portion 921 .

[0194] Therefore, as airflow AF flows toward installation portion 921, it can easily flow along both second columnar protrusions 93A2 and first columnar protrusions 93A1. This facilitates heat transfer from airflow AF to columnar protrusions 93A. This improves the cooling efficiency of airflow AF, and consequently, the cooling efficiency of phosphor layer 61.

[0195] In the light source device of this embodiment, the plurality of first columnar protrusions 93A1 and the plurality of second columnar protrusions 93A2 are arranged concentrically around the mounting portion 921. The plurality of first columnar protrusions 93A1 are arranged at intervals of a first angle around the mounting portion 921. The plurality of second columnar protrusions 93A2 are arranged at intervals of a second angle around the mounting portion 921. The first angle and the second angle are different. Specifically, the second angle is smaller than the first angle.

[0196] With this structure, the number of second columnar protrusions 93A2 arranged on the outside can be greater than the number of first columnar protrusions 93A1 arranged on the installation portion 921 side. Furthermore, by making the number of first columnar protrusions 93A1 smaller than the number of second columnar protrusions 93A2, the gaps between the plurality of first columnar protrusions 93A1 can be increased. This allows the airflow AF to flow through the plurality of second columnar protrusions 93A2, promoting heat transfer from the airflow AF to the second columnar protrusions 93A2. Furthermore, it facilitates the flow of air between the plurality of first columnar protrusions 93A1. Consequently, the temperature of the airflow AF flowing to the heat dissipation portion 7, to which the heat of the phosphor layer 61 is transferred, can be reduced, thereby improving the cooling efficiency of the phosphor layer 61.

[0197] In the light source device of the present 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 .

[0198] Here, when the phosphor wheel 6 rotates, the air flow AF mainly flows from the center side of the phosphor wheel 6 toward the outside, and also flows from the plurality of fins 72 toward the heat receiving member 92 .

[0199] Therefore, by arranging the plurality of second columnar protrusions 93A2 as described above, heat generated in the phosphor layer 61 can be easily transferred to the plurality of second columnar protrusions 93A2 via the air flow AF. Therefore, heat generated in the phosphor layer 61 can be easily transferred to the columnar protrusions 93A at a location away from the installation portion 921 where the drive unit 8 is installed.

[0200] [Third embodiment]

[0201] Next, a third embodiment of the present disclosure will be described.

[0202] The projector of this embodiment has the same structure as the projector 1 of the first embodiment, but the structure of the plurality of columnar protrusions is different. In the following description, the same or substantially the same parts as those already described are denoted by the same reference numerals and their description is omitted.

[0203] [Schematic Structure of Projector and Light Source Device]

[0204] Figure 11 This is a plan view of a heat dissipation member 9C of a light source device included in the projector according to the present embodiment, as viewed from the incident side of the excitation light.

[0205] The projector of this embodiment has a second wavelength converter 5A instead of the wavelength converter 5A of the first embodiment. Figure 11 The light source device of this embodiment has the same structure and function as the projector 1 of the first embodiment, except for the wavelength converter 5C shown. That is, the light source device of this embodiment has the same structure and function as the light source device 4 of the first embodiment, except for the wavelength converter 5C being replaced by the wavelength converter 5A.

[0206] The wavelength converter 5C has the same structure and function as the wavelength converter 5A except that it includes a heat sink 9C instead of the heat sink 9A. Specifically, the wavelength converter 5C includes the phosphor wheel 6, the heat sink 7, the drive unit 8, and the heat sink 9C.

[0207] [Structure of heat dissipation components]

[0208] The heat dissipating member 9C has the same structure and function as the heat dissipating 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.

[0209] like Figure 11 As shown, a plurality of columnar protrusions 93C are provided around the mounting portion 921 so as to enable heat transfer with the surface 92A of the heat receiving member 92. The protrusions 93C protrude into the housing space CA1 of the light source housing CA, toward the plurality of fins 72 of the heat dissipating portion 7. Furthermore, the columnar protrusions 93C are heated within the housing space CA1 by the airflow AF generated by the plurality of fins 72 as the phosphor wheel 6 rotates. The heat is then transferred to the heat sink 91 via the heat receiving member 92.

[0210] Similar to the heat receiving member 92 of the heat dissipating member 9B, a plurality of reference circles CR1 to CR6 , which are concentric circles approximately equally spaced around the installation portion 921 , are defined on the surface 92A of the heat receiving member 92 of the heat dissipating member 9C.

[0211] The plurality of columnar protrusions 93C are provided at equal intervals in the circumferential direction (+D2 direction) around the installation portion 921 on each of the reference circles CR1 to CR6 .

[0212] Specifically, the plurality of columnar protrusions 93C arranged on reference circles CR1 to CR3 on the side of the mounting portion 921 are first columnar protrusions 93C1 arranged at intervals of a first angle centered on the mounting portion 921. In this embodiment, the first angle is 30°. Furthermore, the arrangement period of the first columnar protrusions 93C1 arranged on reference circles CR1 and CR3 is shifted by 15° from the arrangement period of the first columnar protrusions 93C1 arranged on reference circle CR2. However, this is not limiting; the first angle may be another angle, and the arrangement periods of the first columnar protrusions 93C1 arranged on reference circles CR1, CR2, and CR3 may also be aligned in phase.

[0213] The plurality of columnar protrusions 93C arranged on reference circles CR4 to CR6 outside the installation portion 921 are second columnar protrusions 93C2 provided at a second angle centered on the installation portion 921. In this embodiment, the second angle is 30°, which is the same as the first angle.

[0214] The area of ​​the cross section of the second columnar protrusion 93C2 perpendicular to the protruding direction from the surface 92A is larger than the area of ​​the cross section of the first columnar protrusion 93C1 perpendicular to the protruding direction from the surface 92A.

[0215] In other words, the area of ​​the cross section of the second columnar protrusion 93C2 perpendicular to the protruding direction into the accommodation space CA1 is larger than the area of ​​the cross section of the first columnar protrusion 93C1 perpendicular to the protruding direction.

[0216] Furthermore, the arrangement period of the second columnar protrusions 93C2 arranged on reference circles CR4 and CR6 is shifted by 15° from the arrangement period of the second columnar protrusions 93C2 arranged on reference circle CR5. However, this is not limiting; the second angle may be another angle, and the arrangement periods of the second columnar protrusions 93C2 arranged on reference circles CR4, CR5, and CR6 may be the same in phase. Furthermore, the second angle may be smaller or larger than the first angle.

[0217] Thus, 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 side of the mounting portion 921 as viewed from the phosphor wheel 6. The plurality of second columnar protrusions 93C2 are arranged outward of the plurality of first columnar protrusions 93C1 as viewed from the phosphor wheel 6. The cross-sectional area of ​​the second columnar protrusions 93C2 is larger than the cross-sectional area of ​​the first columnar protrusions 93C1.

[0218] Furthermore, the comparison is not limited to the comparison of the cross-sectional areas, and the volumes of the first columnar protrusions and the second columnar protrusions 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.

[0219] Furthermore, similar to the plurality of second columnar protrusions 93A2 of the second embodiment, the plurality of second columnar protrusions 93C2 are provided in correspondence with the region of the phosphor wheel 6 where the phosphor layer 61 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 in correspondence with the region where the phosphor layer 61 is provided. Furthermore, the plurality of fins 72 are arranged on the second surface 63B of the support substrate 63 so as to include the region corresponding to the phosphor layer 61 provided on the first surface 63A.

[0220] In a light source device equipped with such a heat sink 9C, when the phosphor wheel 6 rotates, the plurality of fins 72 provided on the phosphor wheel 6 generate an airflow AF that primarily flows from the center of the phosphor wheel 6 toward the outside. Similar to the first embodiment, the airflow AF flows along the inner wall CA11 of the storage space CA1 toward the heat receiving component 92, which faces the plurality of fins 72. The airflow AF that has flowed into the heat receiving component 92 collides with the plurality of second columnar protrusions 93C2 and the plurality of first columnar protrusions 93C1, and then flows along the surface 92A between the plurality of second columnar protrusions 93C2 and between the plurality of first columnar protrusions 93C1 toward the mounting portion 921. During this process, heat is transferred from the airflow AF to the plurality of columnar protrusions 93C. The airflow AF, cooled by flowing between the plurality of columnar protrusions 93C, is then drawn into the plurality of fins 72.

[0221] [Effects of the Third Embodiment]

[0222] The projector according to the present embodiment described above can achieve the same effects as those of the projectors according to the first and second embodiments, and further achieve the following effects.

[0223] In the light source device of this embodiment, the cross-sectional area of ​​the second columnar protrusion 93C2 perpendicular to the protruding direction into the accommodation space CA1 of the light source casing CA is larger than the cross-sectional area of ​​the first columnar protrusion 93C1 perpendicular to the protruding direction.

[0224] Here, when the cross-sectional area of ​​the first columnar protrusions arranged on the installation portion 921 side is large, the intervals between the plurality of first columnar protrusions become small, and thus the airflow AF in the portion of the heat receiving member 92 on the installation portion 921 side is easily obstructed.

[0225] In contrast, by making the cross-sectional area of ​​the second columnar protrusion 93C2 larger than the cross-sectional area of ​​the first columnar protrusion 93C1 , heat can be easily transferred from the airflow AF to the columnar protrusion 93C in the outer portion of the heat receiving member 92 where the airflow AF easily flows.

[0226] Therefore, the temperature of the air flow AF flowing toward the heat dissipating portion 7 can be lowered, and the cooling efficiency of the phosphor layer 61 can be improved.

[0227] [Fourth embodiment]

[0228] Next, a fourth embodiment of the present disclosure will be described.

[0229] The projector of this embodiment has the same structure as the projector 1 of the first embodiment, but the structure of the multiple columnar protrusions of the heat dissipation component is different. Specifically, the second columnar protrusion of the multiple columnar protrusions of this embodiment is located closer to the phosphor wheel and the heat dissipation unit than the first columnar protrusion. In the following description, parts that are identical or substantially identical to parts already described are denoted by the same reference numerals, and their description will be omitted.

[0230] [Schematic Structure of Projector and Light Source Device]

[0231] Figure 12 1 is a diagram schematically showing a cross section of a wavelength converter 5D of a light source device included in the projector according to this embodiment.

[0232] The projector of this embodiment has a second wavelength converter 5A instead of the wavelength converter 5A of the first embodiment. Figure 12 The light source device of this embodiment has the same structure and function as the projector 1 of the first embodiment, except for the wavelength converter 5D shown. That is, the light source device of this embodiment has the same structure and function as the light source device 4 of the first embodiment, except for the wavelength converter 5D being replaced by the wavelength converter 5A.

[0233] The wavelength converter 5D has the same structure and function as the wavelength converter 5A except that it includes a heat sink 9D instead of the heat sink 9A.

[0234] [Structure of heat dissipation components]

[0235] The heat dissipating member 9D has the same structure and function as the heat dissipating member 9B of the second embodiment, except that it has a plurality of columnar protrusions 93D instead of the plurality of columnar protrusions 93A.

[0236] like Figure 12As shown, a plurality of columnar protrusions 93D are provided around the installation portion 921 so as to enable heat transfer with the surface 92A of the heat receiving member 92, and protrude into the housing space CA1 of the light source housing CA toward the plurality of fins 72 included in the heat dissipation portion 7. Furthermore, the plurality of columnar protrusions 93D are heated within the housing space CA1 by the airflow AF generated by the plurality of fins 72 as the phosphor wheel 6 rotates, and the received heat is transferred to the heat sink 91 via the heat receiving member 92.

[0237] Although not shown, similar to the heat receiving member 92 of the heat sink 9B, the surface 92A of the heat receiving member 92 of the heat sink 9D is defined with a plurality of reference circles CR1 to CR6, which are concentric circles centered on the mounting portion 921 and spaced approximately equally apart. The plurality of reference circles CR1 to CR6 are imaginary concentric circles. Furthermore, the plurality of columnar protrusions 93D include: a plurality of first columnar protrusions 93D1 arranged at first angles around the mounting portion 921 on reference circles CR1 to CR3 on the side of the mounting portion 921; and a plurality of second columnar protrusions 93D2 arranged at second angles around the mounting portion 921 on reference circles CR4 to CR6, which are defined outside the reference circles CR1 to CR3. Specifically, the plurality of columnar protrusions 93D include a plurality of first columnar protrusions 93D1 disposed on the installation portion 921 side when viewed from the phosphor wheel, and a plurality of second columnar protrusions 93D2 disposed outside the plurality of first columnar protrusions 93D1 when viewed from the phosphor wheel 6 .

[0238] Furthermore, the first angle and the second angle can be modified as appropriate, and the second angle can be the same as or different from the first angle. In the latter case, the second angle can be smaller or larger than the first angle.

[0239] In this embodiment, the dimension of the second columnar protrusions 93D2 in the direction of protrusion into the accommodating space CA1 is larger than the dimension of the first columnar protrusions 93D1 in the direction of protrusion into the accommodating space CA1. In other words, the dimension of the second columnar protrusions 93D2 in the direction of protrusion from the heat receiving component 92 is larger than the dimension of the first columnar protrusions 93D1 in the direction of protrusion from the heat receiving component 92. In other words, the distance between each of the plurality of second columnar protrusions 93D2 and the heat dissipating portion 7 is smaller than the distance between each of the plurality of first columnar protrusions 93D1 and the heat dissipating portion 7. Furthermore, 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.

[0240] Furthermore, the dimension of the first columnar protrusion 93D1 in the direction of protrusion into the accommodating space CA1 is larger than the dimension (outer diameter) of the first columnar protrusion 93D1 in the direction perpendicular to the protrusion direction into the accommodating space CA1. Furthermore, the dimension of the second columnar protrusion 93D2 in the direction of protrusion into the accommodating space CA1 is larger than the dimension (outer diameter) of the second columnar protrusion 93D2 in the direction perpendicular to the protrusion direction into the accommodating space CA1.

[0241] In this embodiment, the cross-sectional area of ​​the first columnar protrusion 93D1, perpendicular to the direction of protrusion into the accommodation space CA1, and the cross-sectional area of ​​the second columnar protrusion 93D2, perpendicular to the direction of protrusion into the accommodation space CA1, are equal. However, this is not limiting, and the cross-sectional area of ​​the first columnar protrusion 93D1 and the cross-sectional area of ​​the second columnar protrusion 93D2 may be different. For example, as with the first columnar protrusion 93C1 and the second columnar protrusion 93C2, the cross-sectional area of ​​the second columnar protrusion 93D2 may be greater than the cross-sectional area of ​​the first columnar protrusion 93D1.

[0242] In a light source device equipped with such a heat sink 9D, when the phosphor wheel 6 rotates, the plurality of fins 72 provided on the phosphor wheel 6 generate an airflow AF that primarily flows from the center of the phosphor wheel 6 toward the outside. Similar to the first embodiment, the airflow AF flows along the inner wall CA11 of the storage space CA1 toward the heat receiving component 92, which faces the plurality of fins 72. The airflow AF that has flowed into the heat receiving component 92 collides with the plurality of second columnar protrusions 93D2 and the plurality of first columnar protrusions 93D1, and then 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. During this process, heat is transferred from the airflow AF to the plurality of columnar protrusions 93D. The airflow AF, cooled by flowing between the plurality of columnar protrusions 93D, is then drawn into the plurality of fins 72.

[0243] Furthermore, the distance between each of the plurality of second columnar protrusions 93D2 and the heat dissipation portion 7 is smaller than the distance between each of the plurality of first columnar protrusions 93D1 and the heat dissipation portion 7. In other words, the contact area between the second columnar protrusions 93D2 and the airflow AF is larger than the contact area between the first columnar protrusions 93D1 and the airflow AF. Therefore, in the portion away from the outside of the installation portion 921, the heat of the airflow AF can be transferred to the heat receiving component 92 and the heat sink 91 via the columnar protrusions 93D.

[0244] [Effects of the Fourth Embodiment]

[0245] According to the projector of the present embodiment described above, in addition to the same effects as those of the projectors of the first to third embodiments, the following effects are also achieved.

[0246] In the light source device of this embodiment, the distance between each of the plurality of second columnar protrusions 93D2 and the heat dissipation portion 7 is smaller than the distance between each of the plurality of first columnar protrusions 93D1 and the heat dissipation portion 7. The heat dissipation portion 7 corresponds to the wheel-side heat dissipation portion.

[0247] With this structure, heat can be easily transferred from the heat dissipating portion 7 to the columnar protrusion 93D via the airflow AF at a position away from the installation portion 921 where the drive unit 8 is installed. Therefore, the transfer of heat to the drive unit 8 can be suppressed, and the influence of heat on the drive unit 8 can be suppressed.

[0248] [Variations of the Embodiments]

[0249] The present disclosure is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present disclosure are included in the present disclosure.

[0250] In the above-described embodiments, the heat dissipation unit 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 on which the phosphor layer 61 is provided; and a plurality of fins 72 extending from the heat transfer substrate 71. However, this is not limiting; the heat transfer substrate 71 may be omitted, and the plurality of fins 72 may be provided directly on the second surface 63B. Furthermore, the plurality of fins 72 may be provided on the same surface of the phosphor wheel 6 as the surface on which the phosphor layer 61 is provided.

[0251] The fins 72 are curved in a direction opposite to the rotation direction of the fluorescent wheel 6 as they extend outward from the center of the support substrate 63. However, the present invention is not limited thereto, and the fins 72 may have other shapes, such as a linearly extending shape.

[0252] In each of the above embodiments, the heat dissipating components 9A to 9D include a heat sink 91 connected to a heat receiving component 92 on the opposite side of the phosphor wheel 6 in a heat transferable manner and disposed outside the light source housing CA. However, this is not limiting; the heat sink 91 and heat receiving component 92 may be an integral component.

[0253] In the above-described embodiments, the plurality of columnar protrusions 93A, 93C, and 93D each generate turbulent flow by colliding with a surface opposite to the surface where the airflow collides with the columnar protrusion. However, this is not limiting. The columnar protrusion generating turbulence may also be at least one of the plurality of columnar protrusions on the heat dissipation component. In other words, not all of the plurality of columnar protrusions on the heat dissipation component generate turbulent flow. Furthermore, such turbulence may not be generated.

[0254] In the first embodiment described above, the plurality of columnar protrusions 93A are arranged on a plurality of reference circles CR1 to CR3, which are concentric circles centered on the installation portion 921. Specifically, the plurality of columnar protrusions 93A include: a plurality of columnar protrusions 93A arranged on the reference circle CR1 on the installation portion 921 side when viewed from the phosphor wheel 6; and a plurality of columnar protrusions 93A arranged on the reference circles CR2 and CR3, which are outside the reference circle CR1 when viewed from the phosphor wheel 6.

[0255] In the second to fourth embodiments described above, the plurality of columnar protrusions 93A, 93C, and 93D are arranged on a plurality of reference circles CR1 to CR6, which are concentric circles centered on the installation portion 921. Specifically, 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 when viewed from the phosphor wheel 6, and a plurality of second columnar protrusions 93A2, 93C2, and 93D2 arranged outward of the plurality of first columnar protrusions 93A1, 93C1, and 93D1 when viewed from the phosphor wheel 6.

[0256] However, the present invention is not limited thereto, and the columnar protrusions of the heat dissipating members 9A to 9D may be provided around the installation portion 921 of the heat receiving member 92 . The arrangement of the columnar protrusions may be modified as appropriate. For example, a plurality of columnar protrusions may be randomly arranged around the installation portion 921 .

[0257] In the second embodiment described above, the plurality of first columnar protrusions 93A1 are arranged at intervals of a first angle about the mounting portion 921, and the plurality of second columnar protrusions 93A2 are arranged at intervals of a second angle about the mounting portion 921, the second angle being smaller than the first angle. However, this is not limiting, and the second angle may be the same as or 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 the plurality of first columnar protrusions 93C1 and 93D1 arranged at intervals of a first angle about the mounting portion 921, and the plurality of second columnar protrusions 93C2 and 93D2 arranged at intervals of a second angle about the mounting portion 921.

[0258] In the third embodiment described above, the area of ​​the cross section of the second columnar protrusion 93C2, which protrudes from the surface 92A of the heat receiving member 92 toward the plurality of fins 72 into the accommodation space CA1, is greater than the area of ​​the cross section of the first columnar protrusion 93C1, which protrudes from the surface 92A of the heat receiving member 92 toward the plurality of fins 72 into the accommodation space CA1, which is greater than the area of ​​the cross section of the first columnar protrusion 93C1, which protrudes from the surface 92A of the heat receiving member 92 toward the plurality of fins 72 into the accommodation space CA1. However, this is not limiting, and the area of ​​the cross section of the second columnar protrusion 93C2 may be smaller than the area of ​​the cross section of the first columnar protrusion 93C1.

[0259] When the cross-sectional area of ​​one of the first columnar protrusion 93C1 and the second columnar protrusion 93C2 is larger than the cross-sectional area of ​​the other columnar protrusion, one of the first angle and the second angle may be larger than the other or may be the same.

[0260] In the fourth embodiment described above, the distance between the second columnar protrusion 93D2 and the heat dissipation portion 7 is smaller than the distance between the first columnar protrusion 93D1 and the heat dissipation portion 7. However, this is not limiting. The distance between the second columnar protrusion 93D2 and the heat dissipation portion 7 may be larger than the distance between the first columnar protrusion 93D1 and the heat dissipation portion 7, or they may be equal. Furthermore, as long as the distance between at least one of the plurality of columnar protrusions and the heat dissipation portion 7 is smaller than the distance between the other columnar protrusions and the heat dissipation portion 7, the position of the at least one columnar protrusion is not limited. This applies to other embodiments as well.

[0261] In the second to fourth embodiments described above, the second columnar protrusions 93A2, 93C2, and 93D2 are arranged corresponding to the region of the phosphor wheel 6 where the phosphor layer 61 is provided. However, this is not limiting, and the second columnar protrusions 93A2, 93C2, and 93D2 may not be arranged corresponding to the region of the phosphor wheel 6 where the phosphor layer 61 is provided. For example, the second columnar protrusions may be arranged in a wider area than the region where the phosphor layer 61 is provided, or in a narrower area than the region where the phosphor layer 61 is provided. Furthermore, the second columnar protrusions may be arranged regardless of the region where the phosphor layer 61 is provided.

[0262] In each of the above embodiments, the phase of the arrangement period of the columnar protrusions arranged on reference circle CR1 is different from the phase of the arrangement period of the columnar protrusions arranged on reference circle CR2. However, this is not limiting. The reference circle in which the phase of the arrangement period of the columnar protrusions is different from the phase of the arrangement period of other columnar protrusions may be another reference circle. Furthermore, the phase of the arrangement period of the columnar protrusions may be the same or different for all reference circles.

[0263] In the above embodiments, the columnar protrusions 93A, 93C, and 93D are formed in a substantially truncated cone shape. However, the present invention is not limited thereto and the columnar protrusions 93A, 93C, and 93D may be formed in a substantially truncated cone shape, a substantially cylindrical shape, or a substantially prismatic shape.

[0264] In the first embodiment, three reference circles CR1 to CR3 are set on the surface 92A of the heat receiving member 92, centered on the installation portion 921. In the second to fourth embodiments, six reference circles CR1 to CR6 are set on the surface 92A of the heat receiving member 92, centered on the installation portion 921. However, this is not limiting, and the number of reference circles on which the columnar protrusions are arranged can be set as appropriate.

[0265] In each of the above-mentioned embodiments, the heat-receiving component 92 includes a wiring arrangement portion 922 for arranging a wiring FPC connected to the driving unit 8 arranged in the setting portion 921. Furthermore, a plurality of columnar protrusions 93A, 93C, and 93D are provided in a portion other than the wiring arrangement portion 922. However, the present invention is not limited thereto, and the wiring arrangement portion 922 may not be provided. In addition, a portion of the driving unit 8 may be arranged outside the light source housing CA, and the wiring FPC connected to the driving unit 8 may be connected to the driving unit 8 outside the light source housing CA. Furthermore, the wiring FPC may not be a flexible printed circuit board.

[0266] In each of the above embodiments, the light source device 4 has Figure 2 However, the present invention is not limited to the structure and layout of the light source device. The same applies to the projector equipped with the light source device of the present invention.

[0267] In each of the above embodiments, the projector includes three light modulators 343B, 343G, and 343R. However, the present disclosure is not limited thereto and can be applied to a projector including two or fewer or four or more light modulators.

[0268] In each of the above-described embodiments, the light modulator 343 includes a transmissive liquid crystal panel with different light incident and light exit surfaces. However, this is not limiting, and the light modulator included in the projector of the present disclosure may also be a reflective liquid crystal panel with the same light incident and light exit surfaces. Furthermore, light modulators other than liquid crystals, such as those using micromirrors such as a DMD (Digital Micromirror Device), may also be used in the projector, as long as the light modulator can modulate an incident light beam to form an image corresponding to the image information.

[0269] In the above embodiments, the light source device of the present disclosure is applied to a projector. However, the light source device of the present disclosure is not limited thereto and can also be applied to electronic devices other than projectors, such as lighting devices and headlights of automobiles.

[0270] [Summary of the present disclosure]

[0271] The following is a summary of the present disclosure.

[0272] A light source device according to a first embodiment of the present invention comprises: a housing; a fluorescent wheel having a fluorescent body for converting the wavelength of incident light, the fluorescent wheel being arranged in the housing; a wheel-side heat dissipation portion having a plurality of fins provided on one surface of the fluorescent wheel, wherein the plurality of fins generate an airflow flowing from the center side of the fluorescent wheel to the outside as the fluorescent wheel rotates; a driving portion for rotating the fluorescent wheel; a heat receiving component having a mounting portion for mounting the driving portion, the heat receiving component being opposed to the wheel-side heat dissipation portion; and a radiator provided on a side opposite to the fluorescent wheel with respect to the heat receiving component so as to be capable of being dissipated. The heat sink is arranged on the outside of the shell in a manner of heat transfer, and a plurality of columnar protrusions are arranged around the setting portion in a manner capable of heat transfer with the heat-receiving component, and protrude into the shell toward the plurality of fins, the dimension of at least one columnar protrusion along the protruding direction is greater than the dimension of the at least one columnar protrusion in the direction orthogonal to the protruding direction, and the columnar protrusions among the plurality of columnar protrusions that are arranged on the upstream side of the airflow flowing to the plurality of columnar protrusions disperse the airflow toward other columnar protrusions arranged on the downstream side of the airflow.

[0273] With this configuration, when the phosphor wheel is rotated by the drive unit, airflow is generated from the center of the phosphor wheel toward the outside via the multiple fins of the wheel-side heat sink. Heat from the phosphor wheel, i.e., heat generated by the phosphor, is transferred from the multiple fins to the airflow, thereby cooling the phosphor.

[0274] Furthermore, the airflow generated by the rotation of the phosphor wheel flows toward a heat-receiving component positioned opposite the wheel-side heat sink. A plurality of columnar protrusions are provided around the portion where the heat-receiving component is located, projecting into the housing toward the plurality of fins. The plurality of columnar protrusions are connected to the heat-receiving component in a heat-transferable manner. Therefore, heat received by the plurality of columnar protrusions is transferred to the heat sink via the heat-receiving component and dissipated to the exterior of the housing. This reduces the temperature within the housing and the temperature of the airflow flowing toward the plurality of fins, thereby improving the cooling efficiency of the phosphors in the phosphor wheel.

[0275] Furthermore, the heat-receiving component is positioned opposite the wheel-side heat dissipation portion. Multiple columnar protrusions, connected to the heat sink via the heat-receiving component in a heat-transferable manner, project toward the multiple fins of the wheel-side heat dissipation portion. The heat sink is connected to the side of the heat-receiving component opposite the phosphor wheel in a heat-transferable manner. This reduces the amount of structure other than the heat sink protruding outward from the housing. This reduces the size of the light source device compared to a structure in which heat sinks are provided on multiple side surfaces of the housing.

[0276] Therefore, it is possible to improve the cooling efficiency of the light source device and suppress an increase in size.

[0277] In the first aspect, at least one of the plurality of columnar projections may generate a turbulent flow, and the turbulent flow may collide with a surface of the at least one columnar projection opposite to a surface collided with by the airflow.

[0278] With this structure, the columnar protrusions can increase their contact area with the airflow carrying heat flowing through the wheel-side heat sink, thereby promoting heat transfer from the airflow to the columnar protrusions and improving the cooling efficiency of the phosphor.

[0279] 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.

[0280] Here, when the airflow generated by the plurality of fins flows along the heat receiving member as the phosphor wheel rotates, the airflow flows from the outside of the heat receiving member toward the installation portion.

[0281] Therefore, the plurality of columnar protrusions arranged around the mounting portion in a manner capable of transferring heat to the heat-receiving component include a plurality of first columnar protrusions arranged on the side of the mounting portion and a second columnar protrusion arranged outside the plurality of first columnar protrusions. As a result, when air flows toward the mounting portion, the airflow can easily flow along the second columnar protrusions and the first columnar protrusions, respectively. This facilitates heat transfer from the airflow to the columnar protrusions. Consequently, the cooling efficiency of the airflow can be improved, thereby improving the cooling efficiency of the phosphor.

[0282] In the above-mentioned first method, it may also be that the multiple first columnar protrusions and the multiple second columnar protrusions are arranged in concentric circles with the setting portion as the center, the multiple first columnar protrusions are set at a first angle with the setting portion as the center, and the multiple second columnar protrusions are set at a second angle with the setting portion as the center, and the first angle is different from the second angle.

[0283] With this structure, by making the second angle smaller than the first angle, the number of second columnar protrusions arranged on the outside can be greater than the number of first columnar protrusions arranged on the installation portion side. Furthermore, by making the number of first columnar protrusions smaller than the number of second columnar protrusions, the gaps between the multiple first columnar protrusions can be increased. This allows airflow to flow through the multiple second columnar protrusions, promoting heat transfer from the airflow to the second columnar protrusions and facilitating airflow between the multiple first columnar protrusions.

[0284] On the other hand, by making the second angle larger than the first angle, the gaps between the second columnar protrusions can be increased, and the number of first columnar protrusions disposed on the installation portion can be increased, thereby facilitating airflow to the first columnar protrusions.

[0285] Therefore, the temperature of the airflow flowing toward the wheel-side heat dissipation portion to which the heat of the phosphor is transferred can be lowered, and the cooling efficiency of the phosphor can be improved.

[0286] In the above-mentioned first aspect, the second angle may be smaller than the first angle.

[0287] With this structure, as described above, the number of second columnar protrusions arranged on the outside can be increased, and the gaps between the plurality of first columnar protrusions arranged on the mounting portion can be widened. This allows airflow to flow through the plurality of second columnar protrusions, promoting heat transfer from the airflow to the second columnar protrusions. Furthermore, airflow can be easily passed between the plurality of first columnar protrusions. Consequently, the cooling efficiency of the phosphor can be improved.

[0288] In the first aspect described above, an area of ​​a cross section of the second columnar protrusion perpendicular to the protruding direction may be larger than an area of ​​a cross section of the first columnar protrusion perpendicular to the protruding direction.

[0289] Here, if the cross-sectional area of ​​the first columnar projections is large, the intervals between the plurality of first columnar projections become small, and thus the air flow at the portion of the heat receiving member on the installation portion side is easily obstructed.

[0290] In contrast, by making the cross-sectional area of ​​the second columnar protrusion larger than that of the first columnar protrusion, heat can be easily transferred from the airflow to the columnar protrusion in the outer portion of the heat-receiving component where airflow easily flows. This reduces the temperature of the airflow flowing to the wheel-side heat dissipation portion, improving the cooling efficiency of the phosphor.

[0291] In the first aspect described above, a distance between each of the plurality of second columnar protrusions and the wheel-side heat dissipation portion may be smaller than a distance between each of the plurality of first columnar protrusions and the wheel-side heat dissipation portion.

[0292] According to this structure, heat can be easily transferred from the wheel-side heat dissipation portion to the columnar protrusion at a position away from the installation portion where the drive unit is installed. Therefore, the transfer of heat to the drive unit can be suppressed, and the influence of heat on the drive unit can be suppressed.

[0293] In the first aspect described above, the plurality of second columnar protrusions may be arranged corresponding to regions of the fluorescent body wheel where the fluorescent body is provided.

[0294] Here, when the phosphor wheel rotates, the airflow mainly flows in a direction from the center side of the phosphor wheel toward the outside, and also flows in a direction from the plurality of fins toward the heat receiving member.

[0295] Therefore, by arranging the plurality of second columnar protrusions as described above, the heat generated by the phosphor can be easily transferred to the plurality of second columnar protrusions via the airflow. Therefore, the heat generated by the phosphor can be easily transferred to the columnar protrusions at a location away from the installation portion where the drive unit is installed.

[0296] In the first aspect, the heat receiving member may include a wiring arrangement portion for arranging wiring connected to the driving unit, and the plurality of columnar projections may be provided on a portion of the heat receiving member excluding the wiring arrangement portion.

[0297] According to this structure, the wiring connected to the driving unit can be prevented from coming into contact with the columnar projections to which the heat of the phosphor is transferred via the airflow, thereby suppressing the influence of heat on the wiring and the driving unit.

[0298] A light source device according to a second aspect of the present invention comprises: a housing; a fluorescent wheel having a fluorescent body for converting the wavelength of incident light, the fluorescent wheel being arranged in the housing; a wheel-side heat dissipation portion having a plurality of fins provided on one surface of the fluorescent wheel, wherein the plurality of fins generate an airflow flowing from the center side of the fluorescent wheel to the outside as the fluorescent wheel rotates; a driving portion for rotating the fluorescent wheel; and a heat dissipation component opposed to the wheel-side heat dissipation portion, the heat dissipation component comprising: a setting portion for setting the driving portion; a radiator disposed relative to the setting portion. The portion is arranged on the side opposite to the fluorescent wheel, and the heat sink is arranged on the outside of the shell; and a plurality of columnar protrusions are arranged around the setting portion and protrude into the shell toward the plurality of fins, the dimension of at least one columnar protrusion along the protruding direction is greater than the dimension of the at least one columnar protrusion in the direction orthogonal to the protruding direction, and the columnar protrusions among the plurality of columnar protrusions that are arranged on the upstream side of the airflow flowing to the plurality of columnar protrusions disperse the airflow toward the columnar protrusions arranged on the downstream side of the airflow.

[0299] According to such a configuration, it is possible to achieve the same effects as those of the light source device according to the first aspect described above.

[0300] A projector according to a third aspect of the present disclosure includes: a light source device according to the first aspect or the second aspect; an image forming device that forms image light using light emitted from the light source device; and a projection optical device that projects the image light formed by the image forming device.

[0301] This structure can achieve the same effects as the light source device of the first or second embodiment described above. Furthermore, since the cooling efficiency of the phosphor can be improved, the intensity of light incident on the phosphor can be increased, thereby increasing the brightness of the light emitted from the light source device. Consequently, the brightness of the projected image light can be increased.

Claims

1. A light source device, characterized in that: The light source device comprises: case; a phosphor wheel having a phosphor for converting the wavelength of incident light, the phosphor wheel being disposed within the housing; a wheel-side heat dissipation portion having a plurality of fins provided on one surface of the phosphor wheel, wherein the plurality of fins generate an airflow flowing from the center side of the phosphor wheel to the outside as the phosphor wheel rotates; a driving unit that rotates the fluorescent wheel; a heat receiving component having a mounting portion for mounting the driving portion, the heat receiving component being opposite to the wheel-side heat dissipating portion; a heat sink connected to the heat receiving component on a side opposite to the phosphor wheel in a heat transfer manner, the heat sink being arranged outside the housing; as well as a plurality of columnar protrusions, the plurality of columnar protrusions being arranged around the setting portion in a manner capable of conducting heat transfer with the heat receiving component and protruding into the housing toward the plurality of fins; The dimension of at least one of the plurality of columnar protrusions along the protruding direction is larger than the dimension of the at least one columnar protrusion in a direction perpendicular to the protruding direction. The plurality of columnar protrusions include: a plurality of first columnar protrusions arranged on the side of the installation portion when viewed from the fluorescent body wheel; as well as 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 concentric circles centered on the installation portion. The plurality of first columnar protrusions are arranged at intervals of a first angle centered on the setting portion. The plurality of second columnar protrusions are arranged at intervals of a second angle centered on the setting portion. The first angle is different from the second angle.

2. The light source device according to claim 1, wherein At least one of the plurality of columnar projections generates a turbulent flow, and the turbulent flow collides with a surface of the at least one columnar projection opposite to a surface collided with by the airflow.

3. The light source device according to claim 1, wherein The second angle is smaller than the first angle.

4. The light source device according to any one of claims 1 to 3, characterized in that: An area of ​​a cross section of the second columnar protrusion perpendicular to the protruding direction is larger than an area of ​​a cross section of the first columnar protrusion perpendicular to the protruding direction.

5. The light source device according to any one of claims 1 to 3, characterized in that: A distance between each of the plurality of second columnar protrusions and the wheel-side heat dissipation portion is smaller than a distance between each of the plurality of first columnar protrusions and the wheel-side heat dissipation portion.

6. The light source device according to any one of claims 1 to 3, characterized in that: The plurality of second columnar protrusions are arranged corresponding to regions of the phosphor wheel where the phosphor is provided.

7. The light source device according to any one of claims 1 to 3, characterized in that: The heat receiving member includes a wiring arrangement portion for arranging wiring connected to the driving portion. The plurality of columnar protrusions are provided on a portion of the heat receiving member excluding the wiring arrangement portion.

8. The light source device according to any one of claims 1 to 3, characterized in that: The airflow flowing from the center side of the fluorescent body wheel toward the outside flows toward the installation portion between the plurality of second columnar protrusions and between the plurality of first columnar protrusions via the inner wall of the housing.

9. A light source device, characterized in that: The light source device comprises: case; a phosphor wheel having a phosphor for converting the wavelength of incident light, the phosphor wheel being disposed within the housing; a wheel-side heat dissipation portion having a plurality of fins provided on one surface of the phosphor wheel, wherein the plurality of fins generate an airflow flowing from the center side of the phosphor wheel to the outside as the phosphor wheel rotates; a driving unit that rotates the fluorescent wheel; and a heat dissipation component, which is opposite to the wheel-side heat dissipation portion, The heat dissipation component comprises: a setting portion, which is used to set the driving portion; a heat sink disposed on a side opposite to the fluorescent wheel relative to the installation portion, the heat sink being arranged on an outer side of the housing; as well as a plurality of columnar protrusions, the plurality of columnar protrusions being arranged around the setting portion and protruding into the housing toward the plurality of fins; The dimension of at least one of the plurality of columnar protrusions along the protruding direction is larger than the dimension of the at least one columnar protrusion in a direction perpendicular to the protruding direction. The plurality of columnar protrusions include: a plurality of first columnar protrusions arranged on the side of the installation portion when viewed from the fluorescent body wheel; as well as 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 concentric circles centered on the installation portion. The plurality of first columnar protrusions are arranged at intervals of a first angle centered on the setting portion. The plurality of second columnar protrusions are arranged at intervals of a second angle centered on the setting portion. The second angle is smaller than the first angle.

10. A projector comprising: The 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 projects the image light formed by the image forming device.

Images