Wavelength conversion device, light source device, and projector

Abstract

The invention provides a wavelength conversion device, a light source device, and a projector. The cooling efficiency of a phosphor and a driving source can be improved. A wavelength conversion device is provided with: a rotating plate; a wavelength conversion body disposed on the outside of the opening in the radial direction of the rotating plate; a rotating body connected to the rotating plate; a drive source that rotates the rotating plate and the rotating body about a rotating shaft; a suction unit which is formed by combining a rotating plate and a rotating body, is provided inside the opening of the rotating plate, and communicates with a space on the opposite side from the driving source with respect to the rotating plate via the opening; a plurality of fins that rotate together with the rotating plate by means of a driving source; and a plurality of flow paths which are provided between the plurality of fins and through which an air flow flowing into the suction part via the opening flows to the outside of the rotating body.

Description

Technical Field

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

[0002] Conventionally, there is known a phosphor wheel device including a substrate provided with a phosphor region containing a phosphor (see, for example, Patent Document 1).

[0003] The fluorescent wheel device described in Patent Document 1 absorbs excitation light incident on a fluorescent region and emits fluorescent light. The fluorescent region is arranged on a circumference having a first radius from a rotation center of a substrate. The substrate has a ventilation region closer to the rotation axis of the substrate than the fluorescent region, and the ventilation region includes a plurality of first openings and a plurality of second openings.

[0004] Each first opening is in the shape of a quadrilateral and is disposed on a circumference having a second radius smaller than the first radius from the rotation center of the substrate. Each second opening is in the shape of a circle and is disposed on a circumference having a third radius smaller than the second radius from the rotation center of the substrate.

[0005] A plurality of fins are provided on a surface of the substrate opposite to the front surface on which the fluorescent body region is provided. The plurality of fins are provided on a circumference having a third radius from the rotation center of the substrate. That is, the fins and the second openings are provided alternately on the circumference having the third radius from the rotation center of the substrate.

[0006] In Patent Document 1, when the substrate is rotated by the motor, the airflow generated by the plurality of fins passes through the first opening and the second opening and goes around to the front surface side of the substrate, thereby improving the heat dissipation efficiency from the front surface of the fluorescent body wheel device.

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-60175

[0008] Here, in the fluorescent body wheel device described in Patent Document 1, when the substrate rotates, the airflow generated by the plurality of fins first flows toward the plurality of fins, and then flows in the direction opposite to the rotation axis of the substrate. Therefore, the airflow generated by the plurality of fins provided on the back side of the substrate that flows toward the front surface side of the substrate through the plurality of first openings and the plurality of second openings is very small. Therefore, there is a possibility that the fluorescent body region cannot be sufficiently cooled.

[0009] On the other hand, it is considered that when the substrate rotates, the airflow flows from the front surface side of the substrate toward the fins via the second openings arranged alternately with the fins on the circumference having the third radius. However, the plurality of second openings are away from the rotation axis of the substrate. Therefore, the airflow reaching the fins from the front surface side of the substrate via the second openings flows from the fins in the direction opposite to the rotation axis of the substrate, and thus it is difficult to flow to the motor, and thus there is a problem of difficulty in cooling the motor.

[0010] Therefore, a structure capable of improving the cooling efficiency of each of the phosphor and the driving source is desired. Summary of the invention

[0011] A wavelength conversion device according to a first aspect of the present invention comprises: a rotating plate having a first surface, a second surface on a side opposite to the first surface, and an opening penetrating from the first surface to the second surface; a wavelength converter disposed on the rotating plate at a position outside the opening and emitting converted light after converting the wavelength of incident excitation light; a rotating body connected to the rotating plate; a driving source that rotates the rotating plate and the rotating body around a rotating axis; a suction portion that is formed by combining the rotating plate and the rotating body, the suction portion being disposed inside the opening when viewed from a side opposite to the driving source relative to the rotating plate, communicating with a space on a side opposite to the driving source relative to the rotating plate via the opening, a plurality of fins that extend from a portion on the rotating axis side toward an outer side of the rotating plate and are arranged around the suction portion, and rotate together with the rotating plate by means of the driving source; and a plurality of flow paths that are disposed between the plurality of fins and allow an airflow that flows into the interior of the suction portion via the opening to flow to the outside of the rotating body.

[0012] A light source device according to a second aspect of the present invention comprises: the wavelength conversion device according to the first aspect; a housing that accommodates the wavelength conversion device; and a light source that emits excitation light incident on the wavelength conversion device, the housing having an emission portion that emits the converted light to the outside.

[0013] A projector according to a third aspect of the present invention comprises: a light source device according to the second aspect; an image forming device that modulates light emitted from the light source device to form image light; and a projection optical device that projects the image light formed by the image forming device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram showing the structure of the projector according to the first embodiment.

[0015] Figure 2 It is a schematic diagram showing the structure of the light source device according to the first embodiment.

[0016] Figure 3 It is a perspective view showing the wavelength conversion device according to the first embodiment.

[0017] Figure 4 It is a perspective view showing the wavelength conversion device according to the first embodiment.

[0018] Figure 5 It is a diagram showing the wavelength conversion device according to the first embodiment.

[0019] Figure 6 It is a diagram showing the wavelength conversion device according to the first embodiment.

[0020] Figure 7 It is a perspective view showing the driving source of the first embodiment.

[0021] Figure 8 It is a perspective view showing the rotating body of the first embodiment.

[0022] Fig. 9 It is a perspective view showing the rotating body of the first embodiment.

[0023] Fig.10 Schematic diagram showing airflow flowing through the wavelength conversion device according to the first embodiment.

[0024] Fig.11 It is a perspective view showing a wavelength conversion device of a light source device included in a projector according to a second embodiment.

[0025] Fig.12 It is a perspective view showing a wavelength conversion device according to a second embodiment.

[0026] Fig.13 It is an exploded perspective view showing a wavelength conversion device according to the second embodiment.

[0027] Fig.14 It is an exploded perspective view showing a wavelength conversion device according to the second embodiment.

[0028] Fig.15 It is a cross-sectional view showing a wavelength conversion device according to a second embodiment.

[0029] Fig.16 It is a perspective view showing a wavelength conversion device of a light source device included in a projector according to a third embodiment.

[0030] Fig.17 It is a perspective view showing a wavelength conversion device of a light source device included in a projector according to a fourth embodiment.

[0031] Fig.18 It is a perspective view showing a wavelength conversion device of a light source device included in a projector according to a fifth embodiment.

[0032] Fig.19 It is a diagram showing a first modification example of the fluorescent substance wheel according to the first embodiment.

[0033] Fig. 20 It is a diagram showing a second modified example of the fluorescent substance wheel of the first embodiment.

[0034] Description of symbols

[0035] 1: projector; 24: image forming device; 26: projection optical device; 3: light source device; 31: housing (casing) for light source; 311: emission part; 32: light source; 5: wavelength conversion device; 51, 51A, 51B: fluorescent wheel; 52, 52A, 52B: rotating plate; 521: first surface; 522: second surface; 523, 524, 525: opening; 53: wavelength conversion body; 54: reflecting part; 55: driving device; 56: driving source; 561: motor; 5611: rotor; 562: supporting substrate; 5621: control circuit; 563: hub; 5631: main body; 5632: fixing surface; 5633: fitting part; 57: rotating body; 571: fixing part; 572: fitting hole part ; 573: connecting part; 574: suction part; 575: fin; 5751: first end; 5752: second end; 576: flow path; 6, 6A, 6B, 6C: wavelength conversion device; 61, 61A, 61B, 61C: phosphor wheel; 62, 62A, 62B, 62C: rotating plate; 621: first surface; 622: second surface; 623: opening; 624: fin; 6241: first end; 6242: second end; 6243: connecting part; 625: flow path; 626: protrusion; 65: driving device; 66: driving source; 67: rotating body; 671: columnar part; 672: flange part (engaging part); 673: through hole; 68: suction part; Rx: rotating axis; SP: suction space. DETAILED DESCRIPTION

[0036] [First embodiment]

[0037] Hereinafter, a first embodiment of the present invention will be described based on the drawings.

[0038] [Schematic structure of the projector]

[0039] Figure 1 1 is a schematic diagram showing the structure of the projector 1 according to the present embodiment.

[0040] The projector 1 of this embodiment projects image light corresponding to image information. Figure 1As shown, the projector 1 includes an outer casing 11 and an image projection device 2 housed in the outer casing 11. Although not shown in the figure, the projector 1 includes a control device for controlling the operation of the projector 1, a power supply device for supplying power to electronic components of the projector 1, and a cooling device for cooling a cooling object of the projector 1.

[0041] [Structure of image projection device]

[0042] The image projection device 2 forms image light corresponding to input image information and projects the formed image light. The image projection device 2 includes a light source device 3, a uniformizing optical system 21, a color separation optical system 22, a relay optical system 23, an image forming device 24, an optical component housing 25, and a projection optical device 26.

[0043] The light source device 3 emits illumination light toward the uniformizing optical system 21. The structure of the light source device 3 will be described in detail later.

[0044] The uniformizing optical system 21 uniformizes the illumination light emitted from the light source device 3. The uniformized illumination light illuminates a modulation area of ​​a light modulation element 243 described later via the color separation optical system 22 and the relay optical system 23. The uniformizing optical system 21 includes two lens arrays 211 and 212, a polarization conversion element 213, and a superimposing lens 214.

[0045] The color separation optical system 22 separates the illumination light input from the uniformization optical system 21 into red, green, and blue light. The color separation optical system 22 includes two dichroic mirrors 221 and 222 and a reflection mirror 223 that reflects the blue light separated by the dichroic mirror 221 .

[0046] The relay optical system 23 is provided in the optical path of the red light which is longer than the optical path of other colored lights, so as to suppress the loss of the red light. The relay optical system 23 includes an incident side lens 231, a relay lens 233, and reflectors 232 and 234. In the present embodiment, the red light is guided to the relay optical system 23. However, the present invention is not limited thereto, and for example, the colored light which has a longer optical path than other colored lights may be set as blue light, and the blue light may be guided to the relay optical system 23.

[0047] The image forming device 24 modulates the incident red, green and blue light, synthesizes the modulated light, and forms image light. The image forming device 24 has three field lenses 241, three incident side polarizing plates 242, three light modulating elements 243, three outgoing side polarizing plates 244, and one color synthesis optical system 245, which are arranged according to the incident color light.

[0048] The light modulator 243 modulates the light from the light source device 3 to form image light. Specifically, the light modulator 243 modulates the color light incident from the incident side polarizer 242 according to the image signal and emits the modulated color light. The three light modulators 243 include a light modulator 243R that modulates red light, a light modulator 243G that modulates green light, and a light modulator 243B that modulates blue light. As the light modulator 243, a transmissive liquid crystal panel can be exemplified.

[0049] The color synthesis optical system 245 synthesizes the three color lights modulated by the light modulators 243R, 243G, and 243B. The image light synthesized by the color synthesis optical system 245 is incident on the projection optical device 26. In the present embodiment, the color synthesis optical system 245 is composed of a substantially rectangular cross dichroic prism, but may also be composed of a plurality of dichroic mirrors.

[0050] The optical component housing 25 accommodates the above-mentioned uniformizing optical system 21, color separation optical system 22, relay optical system 23, and image forming device 24. In addition, a designed optical axis Ax1 is set in the image projection device 2, and the optical component housing 25 holds the uniformizing optical system 21, color separation optical system 22, relay optical system 23, and image forming device 24 at a predetermined position on the optical axis Ax1. The light source device 3 and the projection optical device 26 are arranged at predetermined positions on the optical axis Ax1.

[0051] The projection optical device 26 projects the image light incident from the image forming device 24 onto a projection surface such as a screen. That is, the projection optical device 26 projects the image light formed by the image forming device 24. The projection optical device 26 may be, for example, a lens assembly having a plurality of lenses (not shown) and a lens barrel 261 housing the plurality of lenses.

[0052] [Structure of light source device]

[0053] Figure 2 2 is a schematic diagram showing the light source device 3 .

[0054] The light source device 3 emits illumination light for illuminating the image forming device 24 toward the uniformizing optical system 21. Figure 2 As shown, the light source device 3 has a light source shell 31, a light source 32, a far-focus optical element 33, a first phase difference element 34, a diffuse transmission element 35, a light separation and synthesis element 36, a first focusing element 37, a second phase difference element 38, a second focusing element 39, a diffuse optical element 40, a third phase difference element 41 and a wavelength conversion device 5.

[0055] An optical axis Ax2 extending linearly and an optical axis Ax3 extending linearly and perpendicular to the optical axis Ax2 are set in the light source device 3. The optical axis Ax3 overlaps with the optical axis Ax1 in the uniformizing optical system 21.

[0056] The light source 32 , the afocal optical element 33 , the first phase difference element 34 , the diffuse transmission element 35 , the light separation and synthesis element 36 , the second phase difference element 38 , the second light condensing element 39 , and the diffuse optical element 40 are arranged on the optical axis Ax2 .

[0057] The wavelength conversion device 5 , the first light converging element 37 , the light separation and combination element 36 , and the third phase difference element 41 are arranged on the optical axis Ax3 .

[0058] In the following description, three mutually perpendicular directions are defined as +X direction, +Y direction, and +Z direction. In the present embodiment, the +X direction is defined as the direction in which the light source 32 emits light along the optical axis Ax2, and the +Z direction is defined as the direction in which the light source device 3 emits illumination light along the optical axis Ax3. Although not shown in the figure, the direction opposite to the +X direction is defined as -X direction, the direction opposite to the +Y direction is defined as -Y direction, and the direction opposite to the +Z direction is defined as -Z direction.

[0059] [Structure of the light source housing]

[0060] The light source housing 31 accommodates a light source 32, an afocal optical element 33, a first phase difference element 34, a diffuse transmission element 35, a light separation and synthesis element 36, a first light focusing element 37, a second phase difference element 38, a second light focusing element 39, a diffuse optical element 40, a third phase difference element 41, and a wavelength conversion device 5. The light source housing 31 is a sealed housing into which dust and the like are difficult to enter.

[0061] In addition, the detailed structure of the light source housing 31 will be described in detail later.

[0062] [Structure of light source]

[0063] The light source 32 has at least one solid light emitting element 321, and at least one solid light emitting element 321 emits light incident on the diffusion optical element 40 and the wavelength conversion device 5 in the +X direction. The solid light emitting element 321 emits blue light as excitation light. For example, the solid light emitting element 321 is an LD (Laser Diode) that emits laser light with a peak wavelength of 440 nm.

[0064] The light emitted from the light source 32 is s-polarized blue light BLs for the light separation and combination element 36 .

[0065] However, the present invention is not limited thereto, and the light emitted from the light source 32 may be p-polarized blue light BLp or a mixture of s-polarized light and p-polarized light for the light separation and combination element 36. In the latter case, the first phase difference element 34 may be omitted.

[0066] [Structure of afocal optical element]

[0067] The afocal optical element 33 adjusts the beam diameter of the blue light BLs incident in the +X direction from the light source 32. The afocal optical element 33 is composed of a lens 331 for converging the incident light and a lens 332 for parallelizing the beam converged by the lens 331. The afocal optical element 33 may not be present.

[0068] [Structure of the First Phase Difference Element]

[0069] The first phase difference element 34 is disposed between the lens 331 and the lens 332. The first phase difference element 34 converts a portion of the incident blue light BLs into blue light BLp, and emits light including s-polarized blue light BLs and p-polarized blue light BLp. The first phase difference element 34 can also be rotated by a rotating device with the rotation axis along the optical axis Ax2 as the center. In this case, the ratio of the s-polarized light component to the p-polarized light component in the blue light emitted from the first phase difference element 34 can be adjusted according to the rotation angle of the first phase difference element 34.

[0070] [Structure of the diffusion transmission element]

[0071] The diffuse transmission element 35 makes the illumination distribution of the blue light BLp and BLs incident in the +X direction from the lens 332 uniform. The blue light BLs and BLp that have passed through the diffuse transmission element 35 are incident on the light separation and synthesis element 36. The diffuse transmission element 35 can be exemplified by a structure having a hologram, a structure having a plurality of small lenses arranged on a plane perpendicular to the optical axis, and a structure having a rough surface on which light passes.

[0072] In addition, a beam homogenizing optical element having a pair of multi-lenses may be used instead of the diffusion transmission element 35 .

[0073] [Structure of light separation and synthesis element]

[0074] The light separating and combining element 36 has a function as a light separating element that separates incident light and a function as a light combining element that combines light incident from two directions.

[0075] The light separation and synthesis element 36 is a polarization beam splitter that separates the s-polarized light component and the p-polarized light component contained in the incident light. Specifically, the light separation and synthesis element 36 reflects the s-polarized light component and transmits the p-polarized light component. In addition, the light separation and synthesis element 36 has a color separation characteristic that allows light with a wavelength above a specified wavelength to pass through any polarization component among the s-polarized light component and the p-polarized light component. Therefore, the p-polarized blue light BLp among the blue light BLp and BLs incident on the light separation and synthesis element 36 from the diffuse transmission element 35 passes through the light separation and synthesis element 36 in the +X direction and is incident on the second phase difference element 38. On the other hand, the s-polarized blue light BLs is reflected by the light separation and synthesis element 36 in the -Z direction and is incident on the first focusing element 37.

[0076] In addition, the light separation and synthesis element 36 may also have the following functions: a half mirror function, which allows a part of the light incident from the light source 32 via the diffuse transmission element 35 to pass through and reflects the remaining light; and a dichroic mirror function, which reflects the blue light incident from the diffuse optical element 40 and allows the fluorescence incident from the wavelength conversion device 5 and having a wavelength longer than the wavelength of the blue light to pass through. In this case, the first phase difference element 34 can be omitted.

[0077] [Structure of the first light concentrating element]

[0078] The first light focusing element 37 constitutes a pickup optical system. The first light focusing element 37 focuses the blue light BLs reflected in the -Z direction by the light separation and synthesis element 36 to the wavelength converter 53 described later of the fluorescent wheel 51 of the wavelength conversion device 5. In addition, the first light focusing element 37 collimates the fluorescent light YL incident in the +Z direction from the wavelength converter 53, and emits the collimated fluorescent light YL to the light separation and synthesis element 36. In the present embodiment, the first light focusing element 37 is composed of three lenses 371, 372, and 373, but the number of lenses constituting the first light focusing element 37 is not limited.

[0079] [Schematic Structure of Wavelength Converter]

[0080] The wavelength conversion device 5 includes a phosphor wheel 51 that converts the wavelength of the blue light BLs incident from the first light focusing element 37 and emits the fluorescence YL. The phosphor wheel 51 is a so-called reflective wavelength conversion element, and emits the fluorescence YL in a direction opposite to the incident direction of the blue light BLs as the excitation light. The structure of the wavelength conversion device 5 will be described in detail later.

[0081] The fluorescence YL emitted from the wavelength converter 5 in the +Z direction is collimated by the first light focusing element 37 and then incident on the light separation and synthesis element 36. As described above, the light separation and synthesis element 36 has a characteristic of transmitting the fluorescence YL, and therefore, the fluorescence YL incident on the light separation and synthesis element 36 along the +Z direction is transmitted through the light separation and synthesis element 36 and incident on the third phase difference element 41.

[0082] [Structure of the Second Phase Difference Element]

[0083] The second phase difference element 38 is arranged in the +X direction relative to the light separation and synthesis element 36. That is, the second phase difference element 38 is arranged between the light separation and synthesis element 36 and the second light focusing element 39. The second phase difference element 38 converts the blue light BLp that has passed through the light separation and synthesis element 36 in the +X direction into circularly polarized blue light BLc. The blue light BLc that has passed through the second phase difference element 38 in the +X direction is incident on the second light focusing element 39.

[0084] [Structure of the second light concentrating element]

[0085] The second condensing element 39 condenses the blue light BLc that passes through the light separation and combination element 36 in the +X direction and enters from the second phase difference element 38 to the optical diffuser 40. The second condensing element 39 collimates the light that enters from the optical diffuser 40 in the -X direction and emits it to the second phase difference element 38.

[0086] In the present embodiment, the second light concentrating element 39 is composed of three lenses 391 , 392 , and 393 , but the number of lenses constituting the second light concentrating element 39 is not limited.

[0087] [Structure of diffusion optical element]

[0088] The diffusion optical element 40 diffuses the incident blue light BLc at the same diffusion angle as the fluorescence YL emitted from the wavelength conversion device 5. Specifically, the diffusion optical element 40 reflects and diffuses the blue light BLc incident from the second focusing element 39 in the +X direction in the -X direction. The diffusion optical element 40 is a reflective element that causes the incident blue light BLc to perform Lambertian reflection. In addition, the diffusion optical element 40 can also be rotated by a rotating device around a rotation axis parallel to the optical axis Ax2.

[0089] The blue light BLc diffused by the diffusion optical element 40 enters the second phase difference element 38 after passing through the second focusing element 39. The blue light BLc incident on the diffusion optical element 40 is converted into circularly polarized light with the rotation direction in the opposite direction when reflected by the diffusion optical element 40. Therefore, the blue light BLc incident on the second phase difference element 38 via the second focusing element 39 is converted into s-polarized blue light BLs by the second phase difference element 38. In addition, the blue light BLs is reflected in the +Z direction by the light separation and synthesis element 36 and enters the third phase difference element 41. That is, the light incident on the third phase difference element 41 from the light separation and synthesis element 36 is white light in which the blue light BLs and the fluorescence YL are mixed.

[0090] [Structure of the Third Phase Difference Element]

[0091] The third phase difference element 41 converts the white light including the blue light BLs and the fluorescence YL incident from the light separation and combination element 36 into white light including a mixture of s-polarized light and p-polarized light. The white light thus converted is emitted in the +Z direction as illumination light LT and enters the uniformization optical system 21 .

[0092] [Structure of wavelength conversion device]

[0093] Figure 3 and Figure 4 is a perspective view showing the wavelength conversion device 5. In detail, Figure 3 is a perspective view showing the wavelength conversion device 5 viewed from the incident side of the excitation light, Figure 4 is a perspective view showing the wavelength conversion device 5 viewed from the side opposite to the incident side of the excitation light. Figure 5 2 is a diagram showing the wavelength conversion device 5 as viewed from the incident side of the excitation light. Figure 6 1 is a diagram showing the wavelength conversion device 5 viewed from the side opposite to the incident side of the excitation light.

[0094] As described above, the wavelength conversion device 5 emits converted light after converting the wavelength of the incident excitation light. Specifically, the wavelength conversion device 5 converts the wavelength of the incident blue light and emits fluorescent light including green light and red light. Figure 3 to Figure 6 As shown, the wavelength conversion device 5 has a phosphor wheel 51 and a driving device 55 .

[0095] In the following description, the -Z direction is the direction in which the excitation light enters the wavelength converter 5. The +Z direction is the incident side of the wavelength converter 5 on the excitation light, and the -Z direction is the side of the wavelength converter 5 opposite to the incident side of the excitation light.

[0096] [Structure of phosphor wheel]

[0097] The fluorescent wheel 51 is rotated about the rotation axis Rx by the driving device 55 , converts the wavelength of the incident excitation light, and emits fluorescent light YL as converted light. The fluorescent wheel 51 includes a rotating plate 52 , a wavelength converter 53 , and a reflector 54 .

[0098] [Structure of the rotating plate]

[0099] The rotating plate 52 is formed in a disk shape with the rotating axis Rx as the center. The rotating plate 52 has a first surface 521 , a second surface 522 , and an opening 523 .

[0100] The first surface 521 is a surface perpendicular to the rotation axis Rx and is a surface facing the +Z direction of the rotating plate 52. That is, the first surface 521 is a surface of the rotating plate 52 on the opposite side to the driving device 55. The wavelength converter 53 is provided on the first surface 521.

[0101] The second surface 522 is a surface perpendicular to the rotation axis Rx and is a surface of the rotating plate 52 on the opposite side to the first surface 521. In other words, the second surface 522 is a surface on the driving device 55 side of the rotating plate 52 and faces the -Z direction. The rotating body 57 of the driving device 55 described later is connected to the second surface 522.

[0102] The opening 523 passes through from the first surface 521 to the second surface 522. That is, the opening 523 passes through the rotating plate 52 along the rotation axis Rx parallel to the Z axis. Therefore, airflow can flow from one of the first surface 521 and the second surface 522 to the other through the opening 523.

[0103] like Figure 5 As shown in FIG. 1 , the opening 523 is formed within a range of a radius r1 centered on the rotation axis Rx. That is, when viewed from the +Z direction, the opening 523 includes an extension line of the rotation axis Rx.

[0104] In addition, when viewed from the +Z direction along the rotation axis Rx, the opening 523 overlaps with the drive source 56. Specifically, when viewed from the +Z direction along the rotation axis Rx, the opening 523 overlaps with the motor 561 constituting the drive source 56. In addition, the fitting portion 5633 of the hub 563 constituting the drive source 56 and connected to the motor 561 is exposed in the opening 523.

[0105] [Structure of wavelength converter]

[0106] The wavelength converter 53 includes a fluorescent material that is excited by incident excitation light and emits converted light having a wavelength longer than the wavelength of the excitation light. In the present embodiment, the fluorescent material emits fluorescent light YL having a wavelength longer than the wavelength of the blue light BLs as the excitation light.

[0107] like Figure 3 and Figure 5As shown in FIG. 1 , when viewed from the +Z direction, the wavelength converter 53 is formed in a ring shape with the rotation axis Rx as the center, and is fixed to the first surface 521 of the rotating plate 52. Specifically, the wavelength converter 53 is provided within a range of a radius greater than or equal to r2 and less than or equal to r3 with the rotation axis Rx as the center, wherein the radius r2 is greater than the radius r1, and the radius r3 is greater than the radius r2. That is, when viewed from the +Z direction, the opening 523 is provided on the inner side of the wavelength converter 53.

[0108] [Structure of the reflection part]

[0109] The reflection part 54 is arranged between the rotating plate 52 and the wavelength converter 53. The reflection part 54 reflects the light incident from the wavelength converter 53 toward the wavelength converter 53 side.

[0110] The reflective portion 54 can be configured as a reflective layer provided on the first surface 521 or the wavelength converter 53. In this case, the reflective portion 54 may be a reflective layer provided on substantially the entire surface of the first surface 521. In addition, when the first surface 521 has sufficiently high light reflectivity, the first surface 521 can be used as the reflective portion 54.

[0111] [Structure of the driving device]

[0112] The driving device 55 is connected to the rotating plate 52 of the fluorescent body wheel 51 to rotate the fluorescent body wheel 51. The driving device 55 is arranged in the -Z direction relative to the fluorescent body wheel 51. Figure 4 and Figure 6 As shown, the driving device 55 includes a driving source 56 and a rotating body 57 .

[0113] [Structure of driving source]

[0114] Figure 7 It is a perspective view showing the driving source 56 viewed from the +Z direction.

[0115] like Figure 4 , Figure 6 as well as Figure 7 As shown, the driving source 56 includes a motor 561 , a support substrate 562 , and a hub 563 .

[0116] like Figure 7 As shown, the motor 561 includes a rotor 5611 and a stator (not shown) for rotating the rotor 5611. The motor 561 is controlled by a control circuit 5621 of a support substrate 562, and the rotor 5611 is rotated by the stator.

[0117] The support substrate 562 supports the motor 561. Figure 4 and Figure 6As shown, the support substrate 562 has a control circuit 5621, and the control circuit 5621 is connected to the above-mentioned control device via the flexible printed substrate FP. The control circuit 5621 drives the motor 561 according to an electrical signal input via the flexible printed substrate FP.

[0118] like Figure 7 As shown, the hub 563 is arranged in the +Z direction with respect to the motor 561. The hub 563 is fixed to the rotor 5611, and rotates around the rotation axis Rx together with the rotor 5611 by the motor 561. The hub 563 has a main body 5631 and a fitting part 5633.

[0119] The main body 5631 is the main part of the hub 563. The main body 5631 is formed in a circular shape when viewed from the +Z direction, and the outer diameter of the main body 5631 when viewed from the +Z direction is substantially the same as the outer diameter of the motor 561. In the main body 5631, the surface in the +Z direction is a fixing surface 5632 that faces the rotating body 57 and fixes the rotating body 57 by an adhesive or the like.

[0120] The fitting portion 5633 is formed in a cylindrical shape centered on the rotation axis Rx, and protrudes in the +Z direction from the fixing surface 5632. The fitting portion 5633 is inserted into a fitting hole portion 572 of the rotating body 57, which will be described later, from the -Z direction, and is fitted in the rotating body 57.

[0121] [Structure of the rotating body]

[0122] Figure 8 and Fig. 9 is a perspective view showing the rotating body 57. In detail, Figure 8 2 is a perspective view showing the rotating body 57 viewed from the +Z direction. Fig. 9 It is a perspective view showing the rotating body 57 viewed from the -Z direction.

[0123] The rotating body 57 is fixed to the hub 563 of the driving source 56, and is rotated around the rotation axis Rx by the driving source 56. Figure 3 As shown in FIG. 5 , the rotating body 57 is connected to the rotating plate 52 of the fluorescent body wheel 51, so that the rotating plate 52 rotates. In other words, the rotating body 57 rotates integrally with the rotating plate 52. Figure 8 and Fig. 9 As shown, the rotating body 57 has a fixing portion 571 , a fitting hole portion 572 , a connecting portion 573 , a suction portion 574 , a plurality of fins 575 , and a plurality of flow paths 576 .

[0124] [Structure of the fixing portion and the fitting hole portion]

[0125] The fixing portion 571 is an annular portion of the rotating body 57 fixed to the main body 5631 of the hub 563. When viewed from the +Z direction, the outer diameter of the fixing portion 571 centered on the rotation axis Rx is substantially the same as the outer diameter of the hub 563 centered on the rotation axis Rx.

[0126] The fitting hole portion 572 is formed in the fixing portion 571 in a circular shape centered on the rotation axis Rx, and is a hole portion that penetrates the fixing portion 571 along the rotation axis Rx.

[0127] When the fitting portion 5633 of the hub 563 is inserted into the fitting hole 572 , the −Z direction surface of the fixing portion 571 is fixed to the fixing surface 5632 of the main body 5631 by adhesive or the like, so that the rotating body 57 is fixed to the hub 563 .

[0128] [Structure of the connecting part]

[0129] The connecting portion 573 is provided in the rotating body 57 so as to be separated from the fixing portion 571 in the +Z direction relative to the fixing portion 571. The connecting portion 573 is an annular portion connected to the rotating plate 52. The outer diameter of the connecting portion 573 centered on the rotating axis Rx is larger than the outer diameter of the fixing portion 571 centered on the rotating axis Rx. The inner diameter of the connecting portion 573 centered on the rotating axis Rx is larger than the inner diameter of the opening 523 centered on the rotating axis Rx. That is, the connecting portion 573 is connected to the outer side of the opening 523 at the second surface 522 of the rotating plate 52.

[0130] The surface of the connecting portion 573 in the +Z direction is fixed to the second surface 522 of the rotating plate 52 by an adhesive or the like, so that the rotating plate 52 and the rotating body 57 are integrated.

[0131] [Structure of the suction part]

[0132] The suction portion 574 is formed by combining the rotating plate 52 and the rotating body 57 connected to the hub 563, and is provided on the opposite side of the driving source 56 relative to the rotating plate 52, that is, on the inner side of the opening 523 when viewed from the +Z direction. In addition, when viewed from the +Z direction, the rotation axis Rx is included inside the opening 523 and the suction portion 574.

[0133] The suction portion 574 is a recessed portion opened in the +Z direction via the opening 523 , and the bottom of the suction portion 574 is formed by the fitting portion 5633 of the hub 563 and the fixing portion 571 . A portion of the inner side surface of the suction portion 574 is formed by a plurality of fins 575 .

[0134] The details will be described later. When the rotating plate 52 and the rotating body 57 rotate, the space in the suction part 574 becomes negative pressure by means of the plurality of fins 575 rotating around the rotation axis Rx. Therefore, the airflow flows into the suction part 574 from the space in the +Z direction relative to the rotating plate 52 through the opening 523. That is, the space in the suction part 574 is the suction space SP that sucks the airflow from the space in the +Z direction relative to the rotating plate 52 through the opening 523 by means of the plurality of fins 575, and the wavelength conversion device 5 has the suction space SP. In other words, the suction space SP in the suction part 574 can be said to be a negative pressure generating space that generates negative pressure when the rotating plate 52 and the rotating body 57 rotate.

[0135] [Multiple fin structure]

[0136] The plurality of fins 575 extend from the portion on the side of the rotation axis Rx toward the outside of the rotating plate 52 and are arranged around the suction portion 574. In other words, the plurality of fins 575 are arranged at equal intervals around the suction portion 574 in the circumferential direction centered on the rotation axis Rx. Specifically, the plurality of fins 575 extend from the portion on the side of the rotation axis Rx toward the outside of the rotating plate 52 and are arranged around the suction portion 574 in the circumferential direction centered on the rotation axis Rx. Furthermore, the plurality of fins 575 rotate together with the rotating plate 52 through the driving source 56.

[0137] The plurality of fins 575 connect the fixing portion 571 fixed to the hub 563 and the connecting portion 573 connected to the second surface 522 of the rotating plate 52. That is, the hub 563 of the driving source 56 and the rotating plate 52 are connected via the plurality of fins 575. In other words, the rotating plate 52 and the driving source 56 are connected via the plurality of fins 575.

[0138] Each of the plurality of fins 575 extends radially from the periphery of the fitting hole portion 572 to the periphery of the connection portion 573 with the rotation axis Rx as the center.

[0139] Each of the plurality of fins 575 has a first end 5751 on the rotation axis Rx side and a second end 5752 on the opposite side to the rotation axis Rx.

[0140] like Figure 3 and Figure 5 As shown, when the rotating body 57 is viewed from the +Z direction, the first end 5751 is disposed inside the opening 523 of the rotating plate 52. Specifically, the first end 5751 is disposed inside or within the suction portion 574 in the radial direction of the rotating plate 52.

[0141] like Figure 4 , Figure 6 as well as Figure 8As shown, the second end portion 5752 is disposed on the periphery of the connecting portion 573 .

[0142] The plurality of fins 575 extend linearly in a radial pattern with the rotation axis Rx as the center. However, the present invention is not limited thereto, and the fins 575 may extend linearly in the direction of rotation of the rotating body 57 or in the direction opposite to the rotation direction of the rotating body 57 as they move away from the rotation axis Rx. In addition, the plurality of fins 575 may extend in a curved shape. In this case, for example, the fins 575 may extend in a curved shape in the direction of rotation of the rotating body 57 or in the direction opposite to the rotation direction of the rotating body 57 as they move away from the rotation axis Rx. In addition, the plurality of fins 575 may also be located at positions where the extension lines on the side of the rotation axis Rx deviate from the rotation axis Rx. That is, the extension lines of each fin 575 extending to the side of the rotation axis Rx may not intersect with the rotation axis Rx.

[0143] In the present embodiment, the number of fins 575 is 11. That is, the fins 575 are provided at intervals of approximately 32.7° about the rotation axis Rx. However, the present invention is not limited to this, and the number of fins 575 can be changed as appropriate.

[0144] [Multiple flow path structure]

[0145] The plurality of flow paths 576 are formed by a plurality of holes provided between the plurality of fins 575 in the rotating body 57. Specifically, the plurality of flow paths 576 are provided between two adjacent fins 575 among the plurality of fins 575, and are formed by holes penetrating the rotating body 57 in a direction intersecting the rotation axis Rx. Therefore, the plurality of flow paths 576 communicate the suction space SP in the suction part 574 with the space outside the rotating body 57 relative to the rotation axis Rx.

[0146] The plurality of flow paths 576 are flow paths for allowing the airflow flowing into the suction space SP inside the suction portion 574 through the opening 523 to flow to the outside of the rotating body 57 when the rotating plate 52 and the rotating body 57 rotate. The details will be described later. The airflow flowing through the plurality of flow paths 576 flows along the second surface 522 of the rotating plate 52.

[0147] [Structure of the storage chamber of the light source housing]

[0148] like Figure 2 As shown, the light source housing 31 has an emission portion 311 that emits the illumination light LT.

[0149] That is, the light source housing 31 includes an emission portion 311 that emits converted light obtained by converting the excitation light by the wavelength conversion device 5 .

[0150] In addition, the light source housing 31 has a peripheral wall 312 that surrounds the wavelength conversion device 5 when viewed from the +Z direction, and a closed wall 313 that closes the peripheral wall 312 substantially perpendicular to the rotation axis Rx, and a storage chamber 314 for storing the wavelength conversion device 5 is formed inside by the peripheral wall 312 and the closed wall 313. That is, the light source housing 31 has the storage chamber 314 in which the wavelength conversion device 5 is arranged.

[0151] In the storage chamber 314 , the wavelength conversion device 5 is arranged so that the driving device 55 is arranged between the sealing wall 313 and the rotating plate 52 .

[0152] [Airflow when the phosphor wheel rotates]

[0153] Fig.10 Schematic diagram showing the airflow flowing toward the wavelength conversion device 5 when the fluorescent wheel 51 rotates.

[0154] As described above, when the rotating body 57 is rotated about the rotation axis Rx by the driving source 56 , the rotating plate 52 connected to the rotating body 57 rotates in one direction about the rotation axis Rx.

[0155] When the rotating plate 52 and the rotating body 57 rotate, the suction space SP in the suction portion 574 becomes negative pressure. Fig.10 As shown, airflow is generated from the space on the opposite side of the rotating plate 52 from the drive source 56 toward the rotating plate 52. That is, inside the light source housing 31, airflows AF1 and AF2 are generated from the space in the +Z direction toward the rotating plate 52.

[0156] The airflow AF1 of the airflows AF1 and AF2 toward the rotating plate 52 collides with the first surface 521 of the rotating plate 52, and flows along the first surface 521 toward the outer side in the radial direction of the first surface 521. The wavelength converter 53 provided on the first surface 521 of the rotating plate 52 and the first surface 521 of the rotating plate 52 to which the heat is transferred from the wavelength converter 53 are cooled by such a part of the airflow AF1.

[0157] The airflow AF1 flowing along the first surface 521 toward the outside of the first surface 521 in the radial direction collides with the peripheral wall 312, and becomes the airflow AF3 flowing along the peripheral wall 312 in the +Z direction. In this way, inside the light source housing 31, by rotating the rotating plate 52 and the rotating body 57, the gas in the space in the +Z direction relative to the rotating plate 52 is stirred and circulated.

[0158] In addition, a part of the airflow that collides with the peripheral wall 312 intends to flow in the -Z direction relative to the rotating plate 52, that is, the driving source 56 side. However, such a part of the airflow collides with the airflow that flows along the second surface 522 and collides with the peripheral wall 312 and intends to flow in the +Z direction. As a result, almost all of the airflow AF1 that flows along the first surface 521 flows to the space in the +Z direction relative to the rotating plate 52.

[0159] A part of the suction part 574 is constituted by the rotating body 57. In addition, since the rotating body 57 is provided on the rotor 5611 of the driving source 56, the heat of the driving source 56 is transferred to the rotating body 57.

[0160] On the other hand, of the airflows AF1 and AF2 flowing toward the rotating plate 52, the airflow AF2 flows into the suction space SP in the suction portion 574 through the opening 523 of the rotating plate 52. The rotating body 57 is cooled by the airflow AF2 flowing into the suction space SP, and the driving source 56 is cooled.

[0161] The airflow AF2 flowing into the suction space SP in the suction part 574 is discharged to the outside of the rotating body 57 centered on the rotation axis Rx through the plurality of flow paths 576 by the rotation of the plurality of fins 575. The airflow AF2 discharged to the outside of the rotating body 57 becomes the airflow AF4 and flows along the second surface 522. Thus, the second surface 522 of the rotating plate 52 to which the heat of the wavelength converter 53 is transferred is cooled.

[0162] Furthermore, the gas in the space on the driving source 56 side relative to the rotating plate 52 is pulled by the airflow AF4 flowing along the second surface 522 and toward the outer side in the radial direction of the second surface 522, thereby generating the airflow AF5 flowing from the driving source 56 side toward the second surface 522. Such airflow AF5 flowing toward the second surface 522 flows along the driving source 56 to cool the driving source 56.

[0163] Furthermore, the airflow AF4 flowing along the second surface 522 toward the radially outer side of the second surface 522 collides with the peripheral wall 312. Although not shown in the figure, a part of the airflow AF4 colliding with the peripheral wall 312 flows toward the +Z direction relative to the rotating plate 52.

[0164] The other airflows in the airflow AF4 that collides with the peripheral wall 312 flow in the -Z direction after colliding with the peripheral wall 312, and flow toward the drive source 56 side along the closed wall 313. The airflow AF5 that flows to the drive source 56 side is sucked again by the rotating plurality of fins 575, and flows along the drive source 56. In this way, a part of the airflows AF4 and AF5 in the space surrounded by the peripheral wall 312, the closed wall 313, and the rotating plate 52 circulates in the space, and cools the second surface 522 of the rotating plate 52 and the drive source 56.

[0165] In addition, by generating airflows AF1 and AF2 flowing toward the rotating plate 52, the airflow Figure 2 Flowing in the first light focusing element 37 as the pickup optical system shown in FIG. In the first light focusing element 37, the heat generated by the lenses 371, 372, and 373 increases due to the blue light BLs incident on the wavelength converter 53 and the fluorescent light YL emitted from the wavelength converter 53. When the heat is increased, the optical performance of the lens is affected. In contrast, in the light source device 3 of the present embodiment, it is easy to dissipate the heat generated by the lenses 371, 372, and 373 of the first light focusing element 37 to the airflows AF1 and AF2, so that the lenses 371, 372, and 373 can be effectively cooled, and the reduction in the optical performance of the first light focusing element 37 can be suppressed.

[0166] Here, the light source housing 31 is formed of a material with high thermal conductivity, and the heat in the light source housing 31 is transferred to the light source housing 31 and dissipated to the outside of the light source housing 31 .

[0167] Therefore, for example, a heat dissipating member for dissipating heat received from the space inside the light source housing 31 may be provided on at least one of the peripheral wall 312 and the closing wall 313. Furthermore, a circulation device for circulating a cooling fluid through the heat dissipating member may be provided.

[0168] [Effects of the First Embodiment]

[0169] The projector 1 according to the present embodiment described above has the following effects.

[0170] The projector 1 includes a light source device 3 , an image forming device 24 that modulates light emitted from the light source device 3 to form image light, and a projection optical device 26 that projects the image light formed by the image forming device 24 .

[0171] The light source device 3 includes a wavelength converter 5, a light source housing 31 housing the wavelength converter 5, and a light source 32 emitting blue light BLs incident on the wavelength converter 5. The light source housing 31 corresponds to the housing in the present invention, and the blue light BLs corresponds to the excitation light.

[0172] The light source housing 31 includes an emission portion 311 that emits the fluorescent light YL, which is the converted light emitted from the wavelength conversion device 5, to the outside.

[0173] The wavelength conversion device 5 includes a rotating plate 52 , a wavelength converter 53 , a driving source 56 , a rotating body 57 , a suction portion 574 , a plurality of fins 575 , and a plurality of flow paths 576 .

[0174] The rotating plate 52 has a first surface 521, a second surface 522 on the opposite side of the first surface 521, and an opening 523 that passes through the first surface 521 to the second surface 522. The first surface 521 is a surface on the opposite side of the driving source 56 and is a surface facing the +Z direction. The second surface 522 is a surface on the driving source 56 side and is a surface facing the -Z direction.

[0175] The wavelength converter 53 is arranged outside the opening 523 in the radial direction of the rotating plate 52. The wavelength converter 53 emits fluorescent light YL obtained by converting the wavelength of the incident blue light BLs.

[0176] The rotating body 57 is connected to the second surface 522 of the rotating plate 52 .

[0177] The driving source 56 rotates the rotating plate 52 and the rotating body 57 around the rotating axis Rx.

[0178] The suction portion 574 is formed by combining the rotating plate 52 and the rotating body 57. The suction portion 574 is provided on the inner side of the opening 523 when viewed from the side opposite to the driving source 56 of the rotating plate 52. That is, when viewed from the +Z direction, the suction portion 574 is provided on the inner side of the opening 523. The suction portion 574 communicates with the space in the +Z direction relative to the rotating plate 52 via the opening 523.

[0179] The plurality of fins 575 extend from the portion on the rotation axis Rx side toward the outside of the rotating plate 52 and are arranged around the suction portion 574. That is, the plurality of fins 575 extend from the portion on the rotation axis Rx side toward the outside of the rotating plate 52 and are arranged around the suction portion 574 in a circumferential direction centered on the rotation axis Rx. The plurality of fins 575 rotate together with the rotating plate 52 by means of the driving source 56.

[0180] The plurality of flow paths 576 are provided between the plurality of fins 575 . The plurality of flow paths 576 allow the airflow flowing into the inside of the suction part 574 through the opening 523 to flow to the outside of the rotating body 57 .

[0181] According to such a structure, when the rotating plate 52 and the rotating body 57 are rotated with the help of the driving source 56, the suction space SP in the suction part 574 becomes negative pressure with the help of multiple fins 575 arranged around the suction part 574, and the air flows AF1 and AF2 flow from the space on the side opposite to the driving source 56 relative to the rotating plate 52 toward the opening 523.

[0182] The air flow AF1 toward the opening 523 collides with the first surface 521 of the rotating plate 52 and flows along the first surface 521 , thereby cooling the rotating plate 52 .

[0183] On the other hand, the airflow AF2 toward the opening 523 flows into the suction portion 574 through the opening 523. The airflow flowing into the suction portion 574 cools the drive source 56 through the rotating body 57. Furthermore, the airflow flowing into the suction portion 574 flows to the outside of the rotating body 57 through the plurality of flow paths 576 due to the rotation of the plurality of fins 575. The airflow AF4 flowing to the outside of the rotating body 57 flows along the second surface 522 of the rotating plate 52, thereby cooling the rotating plate 52.

[0184] Here, the heat of the wavelength converter 53 provided on the rotating plate 52 is transferred to the entire rotating plate 52. Therefore, the two surfaces of the rotating plate 52 are cooled by the airflow AF1 flowing along the first surface 521 of the rotating plate 52 and the airflow AF4 flowing along the second surface 522 of the rotating plate 52, and the wavelength converter 53 is further cooled.

[0185] When the plurality of fins 575 rotate, the airflow AF5 also flows from the space on the driving source 56 side of the rotating plate 52 toward the rotating plate 52. Since part of the airflow AF5 flows along the driving source 56, the driving source 56 is cooled by part of the airflow AF5.

[0186] In addition, at least a portion of the suction portion 574 through which the airflow flows through the opening 523 is composed of the rotating body 57 that connects the driving source 56 and the rotating plate 52, and a plurality of flow paths 576 are provided around the suction portion 574 to allow the airflow flowing into the inside of the suction portion 574 to flow to the outside of the rotating body 57. Therefore, it is difficult for heat to be transferred from the rotating body 57 to the driving source 56. Thus, it is possible to suppress the heat of the rotating plate 52 on which the wavelength converter 53 is arranged from being transferred to the driving source 56.

[0187] In this way, in addition to making it difficult for the heat of the wavelength converter 53 to be transferred to the drive source 56, the airflow generated by the rotation of the plurality of fins 575 can be used to cool the drive source 56 and the rotating plate 52, and further to cool the wavelength converter 53. Therefore, the cooling efficiency of each of the drive source 56 and the wavelength converter 53 can be improved.

[0188] In addition, in a general wavelength conversion device, in order to improve the cooling effect of the wavelength converter, a large-diameter rotating plate is used, and the wavelength converter is arranged on the peripheral side of the rotating plate. In contrast, the wavelength conversion device 5 of this embodiment can improve the cooling efficiency of the wavelength converter 53, so even if the rotating plate 52 is reduced in diameter, the wavelength converter 53 can be effectively cooled. Therefore, by using a small-diameter rotating plate 52, a low-output driving source can be used as the driving source 56 for driving the rotating plate 52. As a result, in addition to being able to miniaturize the wavelength conversion device 5, the power consumption of the driving source 56 can also be reduced.

[0189] Furthermore, in the light source device 3 having the light source housing 31 as a shell for accommodating the wavelength conversion device 5, the airflow flowing along the rotating plate 52 is convected in the light source housing 31, and then flows toward the suction part 574 again by means of the rotation of the plurality of fins 575. Therefore, the airflow in the light source housing 31 is circulated. In this way, the airflow flowing toward the suction part 574 is the airflow that has convected in the light source housing 31, so the temperature of the airflow flowing toward the wavelength conversion device 5 can be reduced. Therefore, the cooling efficiency of each of the wavelength converter 53 and the drive source 56 can be improved.

[0190] In addition, since the wavelength conversion device 5 is cooled by circulating the airflow in the light source housing 31, a sealed housing can be used as the light source housing 31 that accommodates the wavelength conversion device 5. In this case, dust can be prevented from entering the light source housing 31, and dust can be prevented from adhering to the light source 32 and the wavelength conversion device 5.

[0191] As described above, the cooling efficiency of the wavelength conversion device 5 can be improved, so that the quality of the projected image can be suppressed from being degraded, and the life of the projector 1 can be extended.

[0192] In the wavelength conversion device 5, when viewed from the side opposite to the drive source 56 with respect to the rotating plate 52, the first end 5751 of each of the plurality of fins 575 on the side of the rotation axis Rx is arranged inside the opening 523. According to such a structure, the airflow flowing into the suction part 574 through the opening 523 can be quickly circulated to the outside of the rotating body 57 by the rotating plurality of fins 575. Thus, the flow rate of the airflow flowing into the suction part 574 can be increased, and the flow rate of the airflow flowing along the second surface 522 of the rotating plate 52 can be increased. Therefore, the cooling efficiency of each of the wavelength converter 53 and the drive source 56 can be improved.

[0193] In the wavelength conversion device 5 , the rotating plate 52 and the driving source 56 are connected via a plurality of fins 575 .

[0194] According to such a structure, the interval between the rotating plate 52 and the driving source 56 can be reduced, and the suction part 574 having a plurality of fins 575 provided around it can be easily configured. Therefore, the wavelength conversion device 5 can be miniaturized in the Z axis along the rotation axis Rx.

[0195] In the wavelength conversion device 5 , the opening 523 overlaps with the driving source 56 when viewed along the rotation axis Rx.

[0196] According to such a configuration, the airflow flowing into the suction portion 574 can be easily caused to flow toward the rotating body 57 and further toward the hub 563 of the driving source 56. Therefore, the cooling efficiency of the driving source 56 can be improved.

[0197] In the wavelength conversion device 5 , an extension line of the rotation axis Rx passes through the opening 523 .

[0198] According to such a structure, the opening 523 is arranged on the rotation axis Rx. Therefore, when the rotating plate 52 and the rotating body 57 rotate, it is easy to make the opening 523 have a negative pressure, and it is easy to make the air flow flow into the suction part 574 through the opening 523. Therefore, the flow rate of the air flow flowing to the rotating plate 52 and the rotating body 57 can be increased, and thus, the cooling efficiency of each of the wavelength converter 53 and the driving source 56 can be further improved.

[0199] Here, it is possible to consider forming openings on the rotating plate by punching. When multiple openings are provided on the rotating plate by such a method, the rotating plate generates strain, which causes deformation of the wavelength converter and further damage to the wavelength converter. Therefore, it is necessary to study a structure that suppresses deformation of the wavelength converter.

[0200] On the other hand, the opening 523 is arranged on the rotation axis Rx, and thus one opening 523 is provided in the rotating plate 52. Therefore, it is possible to suppress the rotation plate 52 from being strained, and to suppress the wavelength converter 53 from being deformed or damaged.

[0201] [Second embodiment]

[0202] Next, a second embodiment of the present invention will be described.

[0203] The projector of this embodiment has the same structure as the projector 1 of the first embodiment, but is different in that the rotating plate has a nozzle. In the following description, the same or substantially the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.

[0204] [Structure of projector and light source device]

[0205] Fig.11 and Fig.12 : is a perspective view showing a wavelength conversion device 6 of a light source device included in the projector of this embodiment. Fig.11 is a perspective view showing the wavelength conversion device 6 viewed from the +Z direction, Fig.12 This is a perspective view of the wavelength conversion device 6 as viewed from the -Z direction. Fig.13 is an exploded perspective view showing the wavelength conversion device 6 viewed from the +Z direction, Fig.14 is an exploded perspective view of the wavelength conversion device 6 viewed from the -Z direction. Figure 11 to Figure 14 In the figure, in addition to only a part of the plurality of fins 624 being labeled with reference numerals, only a part of the plurality of flow paths 625 are also labeled with reference numerals.

[0206] The projector of this embodiment has a second embodiment instead of the wavelength conversion device 5 of the first embodiment. Figure 11 to Figure 14 That is, the light source device of this embodiment has the same structure and function as the light source device 3 of the first embodiment except that the wavelength conversion device 5 is replaced by the wavelength conversion device 6.

[0207] [Structure of wavelength conversion device]

[0208] The wavelength conversion device 6 is housed in the light source housing 31 as a shell, similarly to the wavelength conversion device 5, and emits converted light after converting the wavelength of the incident excitation light. Specifically, the wavelength conversion device 6 emits fluorescent light YL having a wavelength longer than the wavelength of the incident blue light BLs. The wavelength conversion device 6 includes a fluorescent body wheel 61, a driving device 65, and an intake unit 68.

[0209] The fluorescent substance wheel 61 has the same structure and function as the fluorescent substance wheel 51 of the first embodiment except that the rotating plate 62 is provided instead of the rotating plate 52. That is, the fluorescent substance wheel 61 includes the rotating plate 62, the wavelength converter 53, and the reflecting part 54.

[0210] The driving device 65 includes a driving source 66 and a rotating body 67 .

[0211] The suction portion 68 is formed by combining the rotating plate 62 and the rotating body 67 .

[0212] Next, the structure of the wavelength conversion device 6 will be described.

[0213] [Structure of the driving device]

[0214] First, the driving device 65 will be described.

[0215] The driving device 65 rotates the fluorescent wheel 61 around the rotation axis Rx as the center, similarly to the driving device 55 of the first embodiment. Figure 12 to Figure 14 As shown, the driving device 65 includes a driving source 66 and a rotating body 67 .

[0216] The driving source 66 has the same structure and function as the driving source 56 of the first embodiment except that the hub 563 is not provided. Fig.13 As shown, the driving source 66 includes a motor 561 and a support substrate 562 .

[0217] The rotating body 67 is a hub provided on the driving source 66 instead of the hub 563 of the first embodiment. Fig.11 as well as Fig.13As shown, the rotor 5611 of the motor 561 is fixed. The rotating body 67 is connected to the driving source 66 and the rotating plate 62, and rotates together with the rotating plate 62 through the driving source 66. The rotating body 67 is arranged in the +Z direction with respect to the motor 561. The rotating body 67 has a columnar portion 671 and a flange portion 672.

[0218] The columnar portion 671 is a portion that protrudes in the +Z direction in a cylindrical shape with the rotation axis Rx as the center.

[0219] The flange portion 672 is equivalent to the engaging portion in the present invention. The flange portion 672 is a portion arranged outside the columnar portion 671 and is a portion formed in a disc shape with the rotation axis Rx as the center. The flange portion 672 engages with the protrusion 626 of the rotating plate 62 described later. Specifically, the flange portion 672 contacts the end of the protrusion 626 in the -Z direction.

[0220] When viewed from the +Z direction, the outer diameter of the flange portion 672 is larger than the outer diameter of the motor 561. A plurality of through holes 673 penetrating the flange portion 672 along the rotation axis Rx are provided on the periphery of the flange portion 672.

[0221] The plurality of through holes 673 are arranged at equal intervals in the circumferential direction with the rotation axis Rx as the center. Specifically, the plurality of through holes 673 are arranged in the flange portion 672 at positions corresponding to the protrusions 626. The screws SC connecting the rotating plate 62 to the rotating body 67 are inserted through each through hole 673 along the +Z direction. Moreover, the screws SC inserted through the through holes 673 are fixed to the protrusions 626, thereby connecting the rotating body 67 to the rotating plate 62.

[0222] [Structure of the rotating plate]

[0223] The rotating plate 62 supports the wavelength converter 53 and the reflector 54 in the same manner as the rotating plate 52 of the first embodiment. The rotating plate 62 is rotated around the rotation axis Rx by a driving device 65 having a rotating body 67 connected to the rotating plate 62. The rotating plate 62 is configured to be a disk centered on the rotation axis Rx and is formed of, for example, metal. Figure 11 to Figure 14 As shown, the rotating plate 62 has a first surface 621 , a second surface 622 and an opening 623 .

[0224] The first surface 621 is a surface facing the +Z direction.

[0225] The second surface 622 is a surface on the opposite side to the first surface 621 and faces the −Z direction.

[0226] The opening 623 penetrates the rotating plate 62 along the rotation axis Rx from the first surface 621 to the second surface 622. The opening 623 is formed in a circular shape when viewed from the incident side of the excitation light, that is, the +Z direction. The details will be described later. When the rotating plate 62 rotates, the airflow flows from the space in the +Z direction relative to the rotating plate 62 to the suction part 68 through the opening 623.

[0227] [Structure of multiple protrusions]

[0228] like Fig.12 and Fig.14 As shown, the rotating plate 62 has a plurality of fins 624 and a plurality of flow paths 625. Fig.14 As shown, there are also a plurality of protrusions 626 .

[0229] The plurality of protrusions 626 are located outside the opening 623 in the radial direction of the second surface 622, and are arranged at equal intervals in the circumferential direction centered on the rotation axis Rx at positions near the periphery of the opening 623. That is, the plurality of protrusions 626 protrude from the second surface 622 toward the rotating body 67 in the -Z direction. The plurality of protrusions 626 each have a screw hole 6261 for inserting a screw SC in the +Z direction. The screw SC that is inserted into the through hole 673 of the rotating body 67 in the +Z direction is inserted into the screw hole 6261, and the screw SC is fixed to the protrusion 626, thereby connecting the rotating plate 62 and the rotating body 67.

[0230] [Multiple fin structure]

[0231] A plurality of fins 624 are provided on the second surface 622 of the rotating plate 62 facing the driving source 66. Fig.14 As shown, the plurality of fins 624 extend from the portion on the side of the rotation axis Rx toward the outside of the rotating plate 62, and are arranged around the suction portion 68 described later. In other words, the plurality of fins 624 are arranged at equal intervals around the suction portion 68 in the circumferential direction centered on the rotation axis Rx. In detail, the plurality of fins 624 extend from the portion on the side of the rotation axis Rx toward the outside of the rotating plate 62, and are arranged around the suction portion 68 in the circumferential direction centered on the rotation axis Rx. The plurality of fins 624 rotate together with the rotating plate 62 by means of the driving source 66.

[0232] The plurality of fins 624 respectively include a first end portion 6241 , a second end portion 6242 , and a connecting portion 6243 .

[0233] The first end portion 6241 is arranged outside the opening 623 or outside the opening 623 and in the vicinity of the peripheral edge of the opening 623 in the radial direction of the rotating plate 62 .

[0234] The second end portion 6242 is disposed at an edge portion of the rotating plate 62 on the opposite side to the rotating axis Rx. That is, the second end portion 6242 is disposed at the peripheral edge of the second surface 622 of the rotating plate 62.

[0235] The connection portion 6243 is a step portion of the portion provided on the rotation axis Rx side in the fin 624. Specifically, the connection portion 6243 is provided on the rotation axis Rx side including the first end portion 6241 in the fin 624. The connection portion 6243 is a portion of the fin 624 whose protruding dimension from the second surface 622 to the -Z direction is smaller than the protruding dimension of other portions. The connection portion 6243 contacts the surface of the flange portion 672 of the rotating body 67 in the +Z direction when the rotating plate 62 is connected to the rotating body 67. That is, the rotating plate 62 and the rotating body 67 are connected via the connection portion 6243 of each fin 624. In addition, the connection portion 6243 does not necessarily have to be a step portion. That is, the surface of each fin 624 facing the rotating body 67 functions as the connection portion 6243 and is connected to the flange portion 672 of the rotating body 67. On the other hand, each of the plurality of fins 624 may not be in contact with the rotating body 67. In other words, the connecting portion 6243 may not be present in the fin 624.

[0236] Although described in detail later, when the rotating plate 62 and the rotating body 67 are connected, the suction portion 68 is provided between the second surface 622 and the surface of the flange portion 672 in the +Z direction.

[0237] In the present embodiment, each fin 624 extends in a curved shape so as to be closer to the direction opposite to the rotation direction of the rotating plate 62 as it moves from the first end portion 6241 toward the outside of the rotating plate 62 .

[0238] However, the present invention is not limited thereto, and each fin 624 may extend in a curved shape as it moves from the first end 6241 toward the outer side of the rotating plate 62 and approaches the rotation direction of the rotating plate 62. Moreover, each fin 624 may extend in a straight line as in the fin 575 of the first embodiment. In this case, each fin 624 may extend radially with the rotation axis Rx as the center, or may extend in a straight line as it moves from the first end 6241 toward the outer side of the rotating plate 62 and approaches the rotation direction of the rotating plate 62 or the direction opposite to the rotation direction of the rotating plate 62. In addition, each fin 624 may also be present at a position where the extension line on the side of the rotating axis Rx deviates from the rotating axis Rx. That is, the extension line of each fin 624 extending to the side of the rotating axis Rx may not intersect with the rotating axis Rx.

[0239] [Multiple flow path structure]

[0240] The plurality of flow paths 625 are provided between the plurality of fins 624. Specifically, the plurality of flow paths 625 are provided between two adjacent fins 624. The plurality of flow paths 625 are flow paths for allowing the airflow flowing into the suction part 68 described later through the opening 623 to flow to the outside of the rotating body 67.

[0241] [Structure of the suction part]

[0242] Fig.15 It is a diagram showing a cross section of the wavelength conversion device 6 along the YZ plane.

[0243] The suction part 68 is a part formed when the rotating plate 62 and the rotating body 67 are combined in the wavelength conversion device 6. Fig.11 As shown, when viewed from the +Z direction, the suction portion 68 is disposed on the inner side of the opening 623. Fig.15 As shown, it is the portion between the rotating plate 62 and the rotating body 67. That is, the suction portion 68 is provided on the side opposite to the driving source 66 relative to the rotating body 67, that is, it is provided on the inner side of the opening 623 when viewed from the +Z direction, and is connected to the space in the +Z direction relative to the rotating plate 62 through the opening 623. In detail, the suction portion 68 is a gap portion formed between the second surface 622 of the rotating plate 62 and the surface of the rotating body 67 facing the +Z direction by bringing the connecting portions 6243 of the plurality of fins 624 and the plurality of protrusions 626 into contact with the flange portion 672 of the rotating body 67.

[0244] The space in the suction portion 68 is a suction space SP that becomes negative pressure by means of a plurality of fins 624 provided on the rotating plate 62 when the rotating plate 62 and the rotating body 67 rotate, and sucks air from the space in the +Z direction relative to the rotating plate 62 through the opening 623. That is, the suction space SP in the suction portion 68 can be said to be a negative pressure generating space that generates negative pressure when the rotating plate 62 and the rotating body 67 rotate.

[0245] The airflow flowing into the suction space SP is sucked by the rotating fins 624 , and flows from the periphery of the opening 623 toward the outer periphery of the rotating plate 62 through the flow paths 625 provided between the fins 624 .

[0246] [Airflow when the phosphor wheel rotates]

[0247] Although not shown in the figure, the flow of airflow when the fluorescent substance wheel 61 is rotated by the driving device 65 is the same as that of the wavelength conversion device 5 of the first embodiment.

[0248] That is, when the rotating plate 62 and the rotating body 67 rotate about the rotation axis Rx, the suction space SP in the suction portion 68 becomes negative pressure. Therefore, airflow from the space in the +Z direction relative to the rotating plate 62 toward the rotating plate 62 is generated in the light source housing 31 .

[0249] A portion of the airflow toward the rotating plate 62 is Fig.10 The airflow AF1 shown in the figure collides with the first surface 621 of the rotating plate 62 in the same manner, and flows along the first surface 621 toward the outer side in the radial direction of the first surface 621. By such an airflow, the wavelength converter 53 provided on the first surface 621 and the first surface 621 to which heat is transferred from the wavelength converter 53 are cooled. In addition, the airflow flowing toward the outer side in the radial direction of the first surface 621 flows along the peripheral wall 312 in the +Z direction, generates convection inside the light source housing 31, and flows toward the rotating plate 62 again. That is, in the light source housing 31, by rotating the rotating plate 62 and the rotating body 67, the gas in the space in the +Z direction relative to the rotating plate 62 is stirred and circulated. At this time, at least a part of the airflow that generates convection inside the light source housing 31 and flows toward the rotating plate 62 flows, for example, along the first focusing element 37, and cools the first focusing element 37.

[0250] Part of the airflow toward the rotating plate 62 flows into the suction space SP in the suction portion 68 through the opening 623. The rotating body 67 is cooled by the airflow flowing into the suction space SP, and the driving source 66 is cooled.

[0251] The airflow flowing into the suction space SP is discharged to the outside of the rotating body 67 through the plurality of flow paths 625 by the rotation of the plurality of fins 624. The airflow discharged to the outside of the rotating body 67 further flows along the second surface 622 through the plurality of flow paths 625. Thus, the second surface 622 to which the heat of the wavelength converter 53 is transferred is cooled.

[0252] In addition, the gas in the space on the driving source 66 side relative to the rotating plate 62 is pulled by the airflow flowing along the second surface 622 toward the outside in the radial direction of the second surface 522, thereby generating an airflow flowing from the driving source 66 side toward the second surface 622. The driving source 66 is cooled by such airflow.

[0253] A portion of the airflow flowing along the second surface 622 toward the outside in the radial direction of the second surface 622 collides with the peripheral wall 312, and then flows toward the -Z direction relative to the rotating plate 62. Such airflow flows toward the drive source 66 side along the closed wall 313, and is sucked again by the rotating plurality of fins 624 to flow along the drive source 66. In this way, the gas in the space surrounded by the peripheral wall 312, the closed wall 313, and the rotating plate 62 circulates in the space, cooling the second surface 622 of the rotating plate 62 and the drive source 66.

[0254] As described above, for example, a heat dissipating member for dissipating heat received from the space inside the light source housing 31 may be provided in at least one of the peripheral wall 312 and the closing wall 313. Furthermore, a circulation device for circulating a cooling fluid through the heat dissipating member may be provided.

[0255] [Effects of the Second Embodiment]

[0256] The projector according to the present embodiment described above has the following effects in addition to the same effects as those of the projector 1 according to the first embodiment.

[0257] For example, the projector of this embodiment includes: a light source device having the same structure and function as the light source device 3; an image forming device 24 and a projection optical device 26. The light source device of this embodiment includes a wavelength conversion device 6, a light source housing 31 and a light source 32, and the light source housing 31 as an outer shell has an emission portion 311 that emits the converted light, that is, the fluorescent light YL emitted from the wavelength conversion device 6 to the outside.

[0258] The wavelength conversion device 6 includes a rotating plate 62 , a wavelength converter 53 , a driving source 66 , a rotating body 67 , a suction unit 68 , a plurality of fins 624 , and a plurality of flow paths 625 .

[0259] The rotating plate 62 has a first surface 621, a second surface 622 on the opposite side of the first surface 621, and an opening 623 that passes through the first surface 621 to the second surface 622. The first surface 621 is a surface on the opposite side of the driving source 66 and is a surface facing the +Z direction. The second surface 622 is a surface on the driving source 66 side and is a surface facing the -Z direction.

[0260] The wavelength converter 53 is arranged outside the opening 623 in the radial direction of the rotating plate 62. The wavelength converter 53 emits fluorescent light YL obtained by converting the wavelength of the incident blue light BLs.

[0261] The rotating body 67 is connected to the second surface 622 of the rotating plate 62 .

[0262] The driving source 66 rotates the rotating plate 62 and the rotating body 67 around the rotating axis Rx.

[0263] The suction part 68 is formed by combining the rotating plate 62 and the rotating body 67. When viewed from the side opposite to the driving source 66 with respect to the rotating plate 62, the suction part 68 is provided on the inner side of the opening 623. That is, when viewed from the +Z direction, the suction part 68 is provided on the inner side of the opening 623. The suction part 68 communicates with the space in the +Z direction with respect to the rotating plate 62 via the opening 623.

[0264] The plurality of fins 624 are arranged around the suction portion 68. The plurality of fins 624 extend from the portion on the rotation axis Rx side toward the outside of the rotating plate 62. The plurality of fins 624 rotate together with the rotating plate 62 by the driving source 66. In the present embodiment, the plurality of fins 624 are provided on the second surface 622 of the rotating plate 62.

[0265] The plurality of flow paths 625 are provided between the plurality of fins 624. The plurality of flow paths 625 allow the airflow flowing into the inside of the suction portion 68 through the opening 623 to flow toward the outside of the rotating body 67 around the rotation axis Rx.

[0266] According to such a structure, the same effect as the wavelength conversion device 5 of the first embodiment can be achieved. Therefore, the light source device of this embodiment having the wavelength conversion device 6 and the projector of this embodiment having the light source device can achieve the same effect as the light source device 3 and the projector 1 of the first embodiment.

[0267] In addition, the wavelength conversion device 6 of this embodiment can improve the cooling efficiency of the wavelength conversion body 53, similarly to the wavelength conversion device 5 of the first embodiment, and therefore, the wavelength conversion body can be cooled even if the diameter of the rotating plate 62 is reduced. Therefore, by adopting a rotating plate 62 with a small diameter, a low-output driving source can be adopted as the driving source 66 for driving the rotating plate 62. In addition, the plurality of fins 624 forming the plurality of flow paths 625 extend to the edge of the rotating plate 62 on the side opposite to the rotation axis Rx side, and therefore, the wavelength conversion device 6 of this embodiment can improve the cooling efficiency of the wavelength conversion body 53 compared to the wavelength conversion device 5 of the first embodiment. Therefore, the wavelength conversion device 6 can contribute to miniaturization and reduced power consumption compared to the above-mentioned wavelength conversion device 5.

[0268] In addition, by generating an airflow toward the rotating plate 62, the airflow Figure 2 The blue light BLs and the fluorescent light YL are incident on the first light collecting element 37, which is a pickup optical system. The heat generated by the lenses 371, 372, and 373 of the first light collecting element 37 can be easily dissipated into such airflow. Therefore, the lenses 371, 372, and 373, which are heated by the incident blue light BLs and the fluorescent light YL, can be effectively cooled.

[0269] In the wavelength converter 6, the first end 6241 of each of the plurality of fins 624 on the rotation axis Rx side is arranged outside the opening 623 when viewed from the drive source 66 side relative to the rotating plate 62. That is, the first end 6241 of each fin 624 is arranged outside the opening 623 when viewed from the -Z direction.

[0270] According to such a configuration, the volume in the suction section 68 can be increased. Therefore, the flow rate of the airflow flowing into the suction space SP in the suction section 68 through the opening 623 can be increased. Therefore, the cooling efficiency of each of the wavelength converter 53 and the drive source 66 can be improved.

[0271] In the wavelength conversion device 6, the second end 6242 of each of the plurality of fins 624 on the opposite side to the rotation axis Rx is arranged on the outer periphery of the rotating plate 62. The outer periphery corresponds to the edge of the rotating plate 62 on the opposite side to the rotation axis Rx.

[0272] According to such a structure, when the plurality of fins 624 rotate, the flow rate of the airflow flowing toward the outer peripheral edge of the rotating plate 62 can be increased. In addition, the flow rate of the airflow flowing from the space on the driving source 66 side relative to the rotating plate 62 toward the rotating plate 62 can be increased, and thus the flow rate of the airflow flowing toward the driving source 66 can be increased. Therefore, the cooling performance of each of the wavelength converter 53 and the driving source 66 provided on the rotating plate 62 can be improved.

[0273] In the wavelength conversion device 6, the rotating plate 62 has a protrusion 626 that protrudes toward the rotating body 67. The rotating body 67 has a flange portion 672 that engages with the protrusion 626. The flange portion 672 corresponds to an engaging portion.

[0274] According to such a configuration, the interval between the rotating plate 62 and the rotating body 67 can be adjusted by adjusting the protruding dimension of the protrusion 626 , thereby making it possible to easily configure the suction portion 68 through which the airflow flows through the opening 623 .

[0275] In addition, the rotating body 67 may include a protrusion that protrudes toward the rotating plate 62, and the rotating plate 62 may include an engaging portion that engages with the protrusion. In this case, the same effects as above can be achieved.

[0276] [Third Embodiment]

[0277] Next, a third embodiment of the present invention will be described.

[0278] The projector of this embodiment has the same structure as the projector of the second embodiment, but the difference is that the rotating plate constituting the wavelength conversion device has a wall portion rising from the first surface and surrounding the opening. 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 is omitted.

[0279] [Structure of projector and light source device]

[0280] Fig.16 1 is a perspective view showing a wavelength conversion device 6A of a light source device included in the projector of this embodiment. Fig.16is a perspective view showing the wavelength conversion device 6A viewed from the +Z direction. Fig.16 In the figure, in addition to only a part of the plurality of fins 624 being labeled with reference numerals, only a part of the plurality of flow paths 625 are also labeled with reference numerals.

[0281] The projector of this embodiment has a second embodiment in place of the wavelength conversion device 6. Fig.16 That is, the light source device of this embodiment has the same structure and function as the light source device 3 of the first embodiment and the light source device of the second embodiment, except that the wavelength conversion device 6A is replaced by the wavelength conversion device 5 and 6.

[0282] [Structure of wavelength conversion device]

[0283] The wavelength conversion device 6A has the same structure and function as the wavelength conversion device 6 except that it includes a fluorescent wheel 61A instead of the fluorescent wheel 61. That is, the wavelength conversion device 6A includes the fluorescent wheel 61A, the driving device 65, and the suction unit 68.

[0284] The fluorescent substance wheel 61A has the same structure and function as the fluorescent substance wheel 61 of the second embodiment except that it includes a rotating plate 62A instead of the rotating plate 62. That is, the fluorescent substance wheel 61A includes the rotating plate 62A, the wavelength converter 53, and the reflecting section 54.

[0285] [Structure of the rotating plate]

[0286] like Fig.16 As shown, the rotating plate 62A has the same structure and function as the rotating plate 62 except for the wall portion 627. That is, the rotating plate 62A has the wall portion 627 in addition to the first surface 621, the second surface 622, the opening 623, the plurality of fins 624, the plurality of flow paths 625 and the plurality of protrusions 626.

[0287] The wall portion 627 is provided on the side of the rotating plate 62A opposite to the driving source 66, that is, on the first surface 621 facing the +Z direction. The wall portion 627 rises from the first surface 621 in the +Z direction and is formed into a cylindrical shape surrounding the opening 623. By providing such a wall portion 627, the airflow flowing to the suction portion 68 through the opening 623 is rectified.

[0288] In addition, in the present embodiment, the wall portion 627 is formed into a cylindrical shape with an outer diameter and an inner diameter approximately uniform around the rotation axis Rx. However, the present invention is not limited thereto, and the wall portion 627 may be formed into a shape in which at least one of the outer diameter and the inner diameter around the rotation axis Rx becomes smaller as it rises from the first surface 621 toward the +Z direction, or may be formed into a shape in which at least one of the outer diameter and the inner diameter around the rotation axis Rx becomes larger.

[0289] [Effects of the Third Embodiment]

[0290] The projector according to the present embodiment described above has the following effects in addition to the same effects as those of the projector according to the second embodiment.

[0291] In the wavelength conversion device 6A, the first surface 621 of the rotating plate 62A is the surface of the rotating plate 62A facing the opposite side of the driving source 66. That is, the first surface 621 is the surface facing the +Z direction. The rotating plate 62A has a wall portion 627 that rises from the first surface 621 in the +Z direction and surrounds the opening 623.

[0292] According to such a structure, the wall portion 627 can be used to rectify the airflow flowing into the suction portion 68 through the opening 623. As a result, the flow velocity and flow rate of the airflow flowing into the suction portion 68 can be increased, so in addition to increasing the flow velocity and flow rate of the airflow flowing along the second surface 622 on the driving source 66 side of the rotating plate 62, the flow velocity and flow rate of the airflow flowing along the driving source 66 and toward the second surface 622 of the rotating plate 62 can also be increased. Therefore, the cooling efficiency of each of the wavelength converter 53 and the driving source 66 can be further improved.

[0293] [Fourth Embodiment]

[0294] Next, a fourth embodiment of the present invention will be described.

[0295] The projector of this embodiment has the same structure as the projector of the second embodiment, but the structure of the multiple fins provided on the rotating plate constituting the wavelength conversion device 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 is omitted.

[0296] [Structure of projector and light source device]

[0297] Fig.17 1 is a perspective view showing a wavelength conversion device 6B of a light source device included in the projector of this embodiment. Fig.17 is a perspective view showing the wavelength conversion device 6B viewed from the +Z direction. Fig.17In the figure, in addition to only a part of the fins 624B being labeled with reference numerals, only a part of the flow paths 625 are also labeled with reference numerals.

[0298] The projector of this embodiment has a second embodiment in place of the wavelength conversion device 6. Fig.17 That is, the light source device of this embodiment has the same structure and function as the light source device of the first to third embodiments except that the wavelength conversion device 6B is replaced by the wavelength conversion device 5, 6, 6A.

[0299] [Structure of wavelength conversion device]

[0300] The wavelength conversion device 6B has the same structure and function as the wavelength conversion device 6 except that it includes a fluorescent wheel 61B instead of the fluorescent wheel 61. That is, the wavelength conversion device 6B includes a fluorescent wheel 61B, a driving device 65, and a suction unit 68.

[0301] The fluorescent substance wheel 61B has the same structure and function as the fluorescent substance wheel 61 of the second embodiment except that it includes a rotating plate 62B instead of the rotating plate 62. That is, the fluorescent substance wheel 61B includes the rotating plate 62B, the wavelength converter 53, and the reflecting section 54.

[0302] [Structure of the rotating plate]

[0303] The rotating plate 62B has the same structure and function as the rotating plate 62, except that it has a plurality of fins 624B instead of the plurality of fins 624. That is, the rotating plate 62B has a first surface 621, a second surface 622, an opening 623, a plurality of fins 624B, a plurality of flow paths 625, and a plurality of protrusions 626. The plurality of flow paths 625 are respectively provided between two adjacent fins 624B among the plurality of fins 624B. In addition, the rotating plate 62B may also have a wall portion 627 of the third embodiment.

[0304] The plurality of fins 624B are arranged around the suction portion 68. The plurality of fins 624B extend from the portion on the rotation axis Rx side toward the outside of the rotating plate 62B. Specifically, the plurality of fins 624B extend from the portion on the rotation axis Rx side toward the outside of the rotating plate 62B, and are arranged around the suction portion 68 along the circumferential direction centered on the rotation axis Rx. The plurality of fins 624B, like the plurality of fins 624, have a first end portion 6241 and a second end portion 6242, and also have a Fig.17 The connecting portion 6243 shown in the figure is omitted.

[0305] Here, in the fin 624 of the second embodiment, the first end 6241 on the rotation axis Rx side is arranged outside the opening 623. In contrast, in the fin 624B of this embodiment, the first end 6241 on the rotation axis Rx side is arranged inside the opening 623 when viewed from the +Z direction.

[0306] Therefore, when the plurality of fins 624B rotates together with the rotating plate 62B, the airflow flowing into the suction space SP in the suction portion 68 can be easily circulated to the outside of the rotating body 67 via the plurality of flow paths 625 .

[0307] [Effects of the Fourth Embodiment]

[0308] The projector according to the present embodiment described above has the following effects in addition to the same effects as those of the projector according to the second embodiment.

[0309] In the wavelength converter 6B, when viewed from the opposite side of the rotating plate 62B from the driving source 66 , ie, the +Z direction, the first end 6241 of each of the plurality of fins 624B on the rotating axis Rx side is arranged inside or at the inner side of the opening 623 .

[0310] According to such a structure, the rotating plurality of fins 624B can make the airflow flowing into the suction part 68 through the opening 623 flow quickly to the outside of the rotating body 67. As a result, the flow rate of the airflow flowing into the suction part 68 can be increased, and the flow rate of the airflow flowing along the second surface 622 of the rotating plate 62B can be increased. Therefore, the cooling efficiency of each of the wavelength converter 53 and the drive source 66 can be improved.

[0311] [Fifth Embodiment]

[0312] Next, a fifth embodiment of the present invention will be described.

[0313] The projector of this embodiment has the same structure as the projector of the second embodiment, but is different in the structure of a plurality of fins provided on a rotating plate constituting a wavelength conversion device.

[0314] In the following description, the same reference numerals are given to parts that are the same as or substantially the same as parts that have already been described, and description thereof will be omitted.

[0315] [Structure of projector and light source device]

[0316] Fig.18 1 is a perspective view showing a wavelength conversion device 6C of a light source device included in the projector of this embodiment. Fig.18 is a perspective view showing the wavelength conversion device 6C viewed from the +Z direction. Fig.18In the figure, in addition to only a part of the fins 624C being labeled with reference numerals, only a part of the flow paths 625 are also labeled with reference numerals.

[0317] The projector of this embodiment has a second embodiment in place of the wavelength conversion device 6. Fig.18 That is, the light source device of this embodiment has the same structure and function as the light source devices of the first to fourth embodiments except that the wavelength conversion device 6C is replaced by the wavelength conversion device 5, 6, 6A, 6B.

[0318] [Structure of wavelength conversion device]

[0319] The wavelength conversion device 6C has the same structure and function as the wavelength conversion device 6 except that it includes a fluorescent wheel 61C instead of the fluorescent wheel 61. That is, the wavelength conversion device 6C includes the fluorescent wheel 61C, the driving device 65, and the suction unit 68.

[0320] The fluorescent substance wheel 61C has the same structure and function as the fluorescent substance wheel 61 of the second embodiment except that a rotating plate 62C is provided instead of the rotating plate 62. That is, the fluorescent substance wheel 61C includes the rotating plate 62C, the wavelength converter 53, and the reflecting section 54.

[0321] [Structure of the rotating plate]

[0322] The rotating plate 62C has the same structure and function as the rotating plate 62, except that it has a plurality of fins 624C instead of the plurality of fins 624. That is, the rotating plate 62C has a first surface 621, a second surface 622, an opening 623, a plurality of fins 624C, a plurality of flow paths 625, and a plurality of protrusions 626. The plurality of flow paths 625 are respectively provided between two adjacent fins 624C among the plurality of fins 624C. In addition, the rotating plate 62C may also have a wall portion 627 of the third embodiment.

[0323] The plurality of fins 624C are arranged around the suction portion 68. The plurality of fins 624C extend from the portion on the rotation axis Rx side toward the outside of the rotating plate 62C. Specifically, the plurality of fins 624C extend from the portion on the rotation axis Rx side toward the outside of the rotating plate 62C, and are arranged around the suction portion 68 along the circumferential direction centered on the rotation axis Rx. The plurality of fins 624C, like the plurality of fins 624, have a first end portion 6241 and a second end portion 6242, and also have a Fig.18 The connecting portion 6243 shown in the figure is omitted.

[0324] In each fin 624C, a first end portion 6241 on the rotation axis Rx side protrudes from the peripheral edge of the opening 623 toward the inside of the opening 623 in the radial direction of the rotating plate 62C. In other words, the first end portion 6241 of each fin 624C is arranged inside or in the opening 623.

[0325] [Effects of the Fifth Embodiment]

[0326] The projector according to the present embodiment described above achieves the same effects as those of the projector according to the fourth embodiment.

[0327] In addition, a part of the fin 624C protrudes from the periphery of the opening 623 toward the inner side or the interior of the opening 623. Thus, the airflow flowing into the suction part 68 through the opening 623 can be easily guided to the plurality of flow paths 625 provided between the plurality of fins 624C. Therefore, the airflow can be easily circulated along the second surface 622 of the rotating plate 62C, and thus the cooling efficiency of each of the wavelength converter 53 and the drive source 66 can be improved.

[0328] [Variations of Embodiments]

[0329] The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.

[0330] In the first embodiment, the rotating plate 52 has one opening 523 including the rotation axis Rx when viewed from the +Z direction. However, the present invention is not limited thereto, and the rotating plate 52 may have more than one opening, and the opening may not include the rotation axis Rx when viewed from the +Z direction.

[0331] Fig.19 This is a diagram of a fluorescent substance wheel 51A as a first modification of the fluorescent substance wheel 51 as viewed from the +Z direction.

[0332] For example, the fluorescent substance wheel 51A includes a rotating plate 52A, and a wavelength converter 53 and a reflecting portion 54 provided on a first surface 521 of the rotating plate 52A.

[0333] The rotating plate 52A has the same function and structure as the rotating plate 52 except that it has a plurality of openings 524 instead of the openings 523. The plurality of openings 524 are arranged in a circumferential direction centered on the rotation axis Rx. When viewed from the +Z direction, the plurality of openings 524 are each formed in a circular shape, and the suction portion 574 is connected to the space in the +Z direction relative to the rotating plate 52A via the plurality of openings 524.

[0334] In addition, Fig.19 In the example of FIG. 5 , eight openings 524 are provided. However, the present invention is not limited thereto, and the number of openings 524 can be appropriately changed as long as it is one or more.

[0335] Fig. 20 This is a diagram of a fluorescent substance wheel 51B as a second modification of the fluorescent substance wheel 51 as viewed from the +Z direction.

[0336] For example, the fluorescent substance wheel 51B includes a rotating plate 52B, and a wavelength converter 53 and a reflecting portion 54 provided on a first surface 521 of the rotating plate 52B.

[0337] The rotating plate 52B has the same function and structure as the rotating plate 52 except that it has a plurality of openings 525 instead of the openings 523. The plurality of openings 525 are arranged in a circumferential direction centered on the rotation axis Rx. When viewed from the +Z direction, the plurality of openings 525 are respectively formed in a fan shape, and the suction portion 574 is connected to the space in the +Z direction relative to the rotating plate 52B via the plurality of openings 525.

[0338] In addition, Fig. 20 In the example of FIG. 5 , four openings 525 are provided. However, the present invention is not limited thereto, and the number of openings 525 can be appropriately changed as long as it is one or more.

[0339] Even when the wavelength conversion device 5 is provided with the rotating plates 52A and 52B instead of the rotating plate 52 , the same effects as those achieved by the wavelength conversion device 5 including the rotating plate 52 can be achieved.

[0340] The number, shape and layout of the openings provided in the rotating plate can also be applied to the rotating plates 62, 62A, 62B and 62C. In this case, the plurality of fins 624 and 624B may also be provided outside the region of the rotating plate where the plurality of openings are provided.

[0341] Furthermore, the opening provided in the rotating plate may not overlap with the driving sources 56 and 66 when viewed along the rotating axis Rx. That is, the opening may be provided outside the driving sources 56 and 66 in the rotating plate without overlapping with the driving sources 56 and 66 when viewed from the +Z direction.

[0342] In the above-mentioned embodiments, the wavelength converter 53 is provided on the first surface 521, 621 of the rotating plate 52, 52A, 52B, 62, 62A, 62B, 62C. However, the present invention is not limited thereto, and the wavelength converter 53 may be provided on the second surface 522, 622 of the rotating plate 52, 52A, 52B, 62, 62A, 62B, 62C. In this case, the blue light BLs as the excitation light may be incident on the wavelength converter 53 from the -Z direction, and when the rotating plate 52, 52A, 52B, 62, 62A, 62B, 62C has light transmittance, the blue light BLs may be incident on the wavelength converter 53 from the +Z direction via the rotating plate.

[0343] In addition, when the wavelength converter 53 is provided on the second surface 622 , the plurality of fins 624 , 624B, and 624C may be provided so as to avoid the wavelength converter 53 .

[0344] In the above-mentioned embodiments, the wavelength conversion devices 5, 6A, 6B, and 6C are reflective wavelength conversion devices that emit converted light toward the incident side of the excitation light. However, the wavelength conversion device of the present invention is not limited to this, and may also be a transmissive wavelength conversion device that emits converted light along the incident direction of the excitation light. In this case, the rotating plates 52, 52A, 52B, 62, 62A, 62B, and 62C only need to have light-transmitting properties.

[0345] In addition, similarly to the above, the plurality of fins 624 , 624B, and 624C may be provided so as to avoid the optical path of the light incident on the wavelength converter 53 and the optical path of the light emitted from the wavelength converter 53 .

[0346] In the first embodiment, the rotating plate 52 and the driving source 56 are connected via the plurality of fins 575 provided on the rotating body 57. In the second to fifth embodiments, the rotating plates 62, 62A, 62B, 62C and the driving source 66 are connected via the plurality of fins 624, 624B, 624C provided on the rotating plates 62, 62A, 62B, 62C. However, the present invention is not limited thereto, and the rotating plate 52 and the driving source 56 may be connected without the plurality of fins.

[0347] On the other hand, as long as the rotating plate 52 and the driving source 56 can be connected via the plurality of fins, the protrusion 626 and the insertion hole 673 may not be provided.

[0348] That is, the connection method between the rotating plate and the rotating body and the connection method between the rotating body and the driving source are not limited to the above-mentioned methods.

[0349] In the third embodiment, the rotating plate 62A includes the wall 627. The rotating plates 62B and 62C in the fourth and fifth embodiments may also include the wall 627. The rotating plate 52 in the first embodiment may also include the wall 627.

[0350] In each of the above embodiments, the projector includes three light modulators 243R, 243G, and 243B, but the present invention is not limited thereto, and the present invention can be applied to a projector including two or less or four or more light modulators.

[0351] In the above-mentioned embodiments, the image projection device 2 has Figure 1 However, the optical components and layout of the image projection device 2 are not limited to the above.

[0352] In each of the above-mentioned embodiments, a transmissive liquid crystal panel having different light incident surfaces and light exit surfaces is exemplified as the light modulator 243. However, the light modulator used in the projector of the present invention is not limited thereto, and the light modulator used in the projector of the present invention may also be a reflective liquid crystal panel having the same light incident surface and light exit surface. In addition, as long as the light modulator can modulate the incident light beam to form an image corresponding to the image information, a light modulator other than liquid crystal, such as a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device), etc., may also be applied to the projector.

[0353] In the above-mentioned embodiments, examples of applying the wavelength conversion device 5, 6, 6A, 6B, 6C to the light source device 3 are shown, and examples of applying the light source device 3 having the wavelength conversion device 5, 6, 6A, 6B, 6C to a projector are shown. However, the present invention is not limited thereto, and the wavelength conversion device of the present invention may also be used in electronic devices other than the light source device, and the light source device of the present invention may also be used in electronic devices other than the projector, such as electronic devices such as lighting devices.

[0354] [Summary of the Invention]

[0355] Hereinafter, a summary of the present invention will be described.

[0356] [Note 1]

[0357] A wavelength conversion device, characterized by comprising: a rotating plate having a first surface, a second surface on a side opposite to the first surface, and an opening penetrating from the first surface to the second surface; a wavelength converter, which is arranged at a position outside the opening in the radial direction of the rotating plate and emits converted light after converting the wavelength of incident excitation light; a rotating body connected to the rotating plate; a driving source, which rotates the rotating plate and the rotating body around a rotating axis; a suction part, which is composed of the rotating plate and the rotating body, and is arranged inside the opening when viewed from the side opposite to the driving source relative to the rotating plate, and communicates with a space on the side opposite to the driving source relative to the rotating plate through the opening; a plurality of fins, which extend from a portion on the rotating axis side toward the outside of the rotating plate and are arranged around the suction part, and rotate together with the rotating plate by the driving source; and a plurality of flow paths, which are arranged between the plurality of fins, and allow the airflow flowing into the inside of the suction part through the opening to flow to the outside of the rotating body.

[0358] According to such a structure, when the rotating plate and the rotating body are rotated by the driving source, the space in the suction part becomes negative pressure due to the multiple fins provided around the suction part, and the airflow flows from the space on the side opposite to the driving source relative to the rotating plate toward the opening.

[0359] A part of the airflow toward the opening collides with the surface of the rotating plate on the opposite side to the driving source, flows along the opposite side surface, and cools the rotating plate.

[0360] On the other hand, another part of the airflow toward the opening flows into the suction part through the opening. The airflow flowing into the suction part cools the driving source through the rotating body. Moreover, by rotating the plurality of fins, the airflow flowing into the suction part flows to the outside of the rotating body through the plurality of flow paths with the rotating axis as the center. Such airflow flows along the surface of the driving source side of the rotating plate to cool the rotating plate.

[0361] Here, the heat of the wavelength converter provided on the rotating plate is transferred to the entire rotating plate. Therefore, the two surfaces of the rotating plate are cooled by the airflow flowing along the surface of the rotating plate opposite to the driving source and the airflow flowing along the surface of the rotating plate on the driving source side, thereby cooling the wavelength converter.

[0362] Furthermore, when the plurality of fins rotate, airflow also flows from the space on the driving source side relative to the rotating plate toward the rotating plate. Since a part of such airflow flows along the driving source, the driving source is cooled by a part of the airflow.

[0363] In addition, at least a portion of the intake portion through which the airflow flows is formed by a rotating body connecting the driving source and the rotating plate, and a plurality of flow paths are provided around the intake portion so that the airflow flowing into the interior of the intake portion flows to the outside of the rotating body. Therefore, it is difficult for heat to be transferred from the rotating plate to the driving source. Thus, it is possible to suppress the heat of the rotating plate provided with the wavelength converter from being transferred to the driving source.

[0364] In this way, in addition to making it difficult for the heat of the wavelength converter to be transferred to the drive source, the airflow generated by the rotation of the plurality of fins can be used to cool the drive source and the rotating plate, and further the wavelength converter. Therefore, the cooling efficiency of each of the drive source and the wavelength converter can be improved.

[0365] [Note 2]

[0366] The wavelength conversion device according to Supplementary Note 1 is characterized in that, when viewed from the opposite side of the driving source with respect to the rotating plate, an end portion of each of the plurality of fins on the rotating shaft side is arranged inside the opening.

[0367] According to such a structure, the airflow flowing into the suction part through the opening can be quickly circulated to the outside of the rotating body by using the rotating multiple fins. As a result, the flow rate of the airflow flowing into the suction part can be increased, and the flow rate of the airflow flowing along the surface of the driving source side of the rotating plate can be increased. Therefore, the cooling efficiency of each of the wavelength converter and the driving source can be improved.

[0368] [Note 3]

[0369] The wavelength conversion device according to Supplementary Note 1 is characterized in that, when viewed from the driving source side relative to the rotating plate, an end portion of each of the plurality of fins on the rotating shaft side is arranged outside the opening.

[0370] According to such a structure, the volume in the suction part can be increased. Therefore, the flow rate of the airflow flowing into the suction part through the opening can be increased. Therefore, the cooling efficiency of each of the wavelength converter and the drive source can be improved.

[0371] [Note 4]

[0372] The wavelength conversion device according to Supplementary Note 2 or 3, characterized in that the end portion of each of the plurality of fins on the side opposite to the rotation axis side is arranged on an edge portion of the rotating plate on the side opposite to the rotation axis.

[0373] According to such a structure, when the plurality of fins rotate, the flow rate of the airflow flowing toward the periphery of the rotating plate can be increased. In addition, the flow rate of the airflow flowing toward the rotating plate from the space on the driving source side relative to the rotating plate can be increased, and the flow rate of the airflow flowing toward the driving source can be increased. Therefore, the cooling performance of each of the wavelength converter and the driving source provided on the rotating plate can be improved.

[0374] [Note 5]

[0375] The wavelength conversion device according to any one of Supplementary Notes 1 to 4 is characterized in that the rotating plate and the driving source are connected via the plurality of fins.

[0376] According to such a structure, the distance between the rotating plate and the driving source can be reduced, and the suction part having a plurality of fins provided around it can be easily configured. Therefore, the wavelength conversion device can be miniaturized in the direction along the rotation axis.

[0377] [Note 6]

[0378] The wavelength conversion device according to any one of Notes 1 to 4 is characterized in that one of the rotating plate and the rotating body has a protrusion protruding toward the other of the rotating plate and the rotating body, and the other of the rotating plate and the rotating body has a locking portion that locks with the protrusion.

[0379] According to such a configuration, the interval between the rotating plate and the rotating body can be adjusted by adjusting the protruding size of the protrusion, thereby easily forming a suction portion through which air flows through the opening.

[0380] [Note 7]

[0381] The wavelength conversion device according to any one of Notes 1 to 6 is characterized in that the first surface is a surface of the rotating plate facing the side opposite to the driving source, and the rotating plate has a wall portion that stands up from the first surface and surrounds the opening.

[0382] According to such a structure, the wall portion can be used to rectify the airflow flowing into the suction portion through the opening. As a result, the flow velocity and flow rate of the airflow flowing into the suction portion can be increased. Therefore, in addition to increasing the flow velocity and flow rate of the airflow flowing along the surface of the driving source side on the rotating plate, the flow velocity and flow rate of the airflow flowing along the driving source and toward the rotating plate can also be increased. Therefore, the cooling efficiency of each of the wavelength converter and the driving source can be further improved.

[0383] [Note 8]

[0384] The wavelength conversion device according to any one of Supplementary Notes 1 to 7, wherein the opening overlaps with the driving source when viewed along the rotation axis.

[0385] According to such a configuration, the airflow flowing into the suction portion can be easily caused to flow toward the rotating body and further toward the driving source, thereby improving the cooling efficiency of the driving source.

[0386] [Note 9]

[0387] The wavelength conversion device according to Supplementary Note 8, wherein an extension line of the rotation axis passes through the opening.

[0388] According to such a structure, the opening is arranged on the rotating shaft. Therefore, when the rotating plate and the rotating body rotate, it is easy to make the opening negative pressure, and it is easy to make the air flow flow into the suction part through the opening. Therefore, the flow rate of the air flow flowing into the rotating plate and the rotating body can be increased, and thus, the cooling efficiency of the wavelength converter and the driving source can be further improved.

[0389] Here, it is possible to consider forming openings on the rotating plate by punching. When multiple openings are provided on the rotating plate by such a method, the rotating plate generates strain, which causes deformation of the wavelength converter and further damage to the wavelength converter. Therefore, it is necessary to study a structure that suppresses deformation of the wavelength converter.

[0390] On the other hand, since the opening is arranged on the rotating shaft, a single opening is provided on the rotating plate, so that the rotating plate can be prevented from being strained, and the wavelength converter can be prevented from being deformed or damaged.

[0391] [Note 10]

[0392] A light source device, characterized in that the light source device comprises: a wavelength conversion device as described in any one of Notes 1 to 9; a housing that accommodates the wavelength conversion device; and a light source that emits excitation light incident on the wavelength conversion device, the housing having an emission portion that emits the converted light to the outside.

[0393] According to such a structure, the same effect as the above-mentioned wavelength conversion device can be achieved.

[0394] In addition, the airflow flowing along the rotating plate is convected in the housing, and then flows toward the suction part again by means of the rotation of the plurality of fins, so that the airflow in the housing circulates. In this way, the airflow flowing toward the suction part is the airflow that has convected in the housing, so the temperature of the airflow flowing toward the wavelength conversion device can be reduced. Therefore, the cooling efficiency of each of the wavelength converter and the drive source can be improved.

[0395] In addition, since the wavelength conversion device is cooled by circulating the airflow in the housing, a sealed housing can be used as the housing for accommodating the wavelength conversion device. In this case, dust can be prevented from entering the housing and adhering to the light source and the wavelength conversion device.

[0396] Furthermore, the airflow circulating in the housing can also cool other optical components arranged in the housing, thereby improving the cooling efficiency of the entire light source device.

[0397] [Note 11]

[0398] A projector, characterized in that the projector comprises: a light source device as described in Appendix 10; an image forming device which modulates light emitted from the light source device to form image light; and a projection optical device which projects the image light formed by the image forming device.

[0399] According to such a configuration, the same effects as those of the above-mentioned light source device can be achieved. In addition, the cooling efficiency of the wavelength conversion device can be improved, so that the quality of the projected image can be suppressed from being degraded and the life of the projector can be extended.

Claims

1. A wavelength conversion device, characterized in that: have: A rotating plate having a first surface, a second surface opposite to the first surface, and an opening extending from the first surface to the second surface; a wavelength converter disposed at an outer side of the opening in the radial direction of the rotating plate and emitting converted light obtained by converting the wavelength of the incident excitation light; A rotating body connected to the rotating plate; A driving source that causes the rotating plate and the rotating body to rotate around a rotating axis; a suction portion, which is formed by combining the rotating plate and the rotating body, and is arranged on the inner side of the opening when viewed from the side opposite to the driving source relative to the rotating plate, and is communicated with the space on the side opposite to the driving source relative to the rotating plate through the opening, A plurality of fins, each extending from a portion on the rotating shaft side toward the outside of the rotating plate and arranged around the suction portion, and rotating together with the rotating plate by means of the driving source; as well as A plurality of flow paths are provided between the plurality of fins and allow the airflow flowing into the inside of the suction part through the opening to flow to the outside of the rotating body.

2. The wavelength conversion device according to claim 1, characterized in that: When viewed from a side opposite to the driving source with respect to the rotating plate, an end portion of each of the plurality of fins on the rotating shaft side is arranged inside the opening.

3. The wavelength conversion device according to claim 1, characterized in that: When the rotating plate is viewed from the driving source side, an end portion of each of the plurality of fins on the rotating shaft side is arranged outside the opening.

4. The wavelength conversion device according to claim 2 or 3, characterized in that: The end portion of each of the plurality of fins on the side opposite to the rotation axis side is arranged at an edge portion of the rotation plate on the side opposite to the rotation axis side.

5. The wavelength conversion device according to any one of claims 1 to 3, characterized in that: The rotating plate and the driving source are connected via the plurality of fins.

6. The wavelength conversion device according to any one of claims 1 to 3, characterized in that: One of the rotating plate and the rotating body has a protrusion that protrudes toward the other of the rotating plate and the rotating body. The other of the rotating plate and the rotating body has an engaging portion that engages with the protrusion.

7. The wavelength conversion device according to any one of claims 1 to 3, characterized in that: The first surface is a surface of the rotating plate facing the opposite side to the driving source. The rotating plate has a wall portion that stands from the first surface and surrounds the opening.

8. The wavelength conversion device according to any one of claims 1 to 3, characterized in that: The opening overlaps the driving source when viewed along the rotation axis.

9. The wavelength conversion device according to claim 8, characterized in that: An extension line of the rotation axis passes through the opening.

10. A light source device, characterized in that: have: The wavelength conversion device according to any one of claims 1 to 3; a housing for housing the wavelength conversion device; and a light source that emits excitation light incident on the wavelength conversion device, The housing includes an emission portion that emits the converted light to the outside.

11. A projector, characterized in that: have: The light source device according to claim 10; an image forming device that modulates the light emitted from the light source device to form image light; and A projection optical device projects the image light formed by the image forming device.

Images