Wavelength conversion device, light source device, and projector

Abstract

To provide a wavelength conversion device capable of excellently transferring heat from a phosphor, a light source device, and a projector.SOLUTION: A wavelength conversion device comprises: a phosphor configured to serve as a heat source and emit light in a specific wavelength band; and a cooling device having a planar heat receiving section on which the phosphor is arranged and configured to dissipate heat of the phosphor received by the heat receiving section.SELECTED DRAWING: Figure 3

Description

Technical Field

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

Background Art

[0002] Conventionally, a projector is known that modulates light emitted from a light source device according to image information to form image light, and enlarges and projects the formed image light toward a screen or the like (see, for example, Patent Document 1). In the projector described in Patent Document 1, the light source device includes a light source including a plurality of semiconductor lasers, a half-wave plate, a polarization beam splitter, a fluorescent element, a quarter-wave plate, and a diffusive reflection element. The half-wave plate receives the light beam emitted from the light source. The polarization beam splitter receives the light beam that has passed through the half-wave plate. The polarization beam splitter reflects the s-polarization component and transmits the p-polarization component of the incident light beam. The polarization beam splitter transmits light having a wavelength band different from the wavelength band of the light beam emitted from the light source. The fluorescent element includes a substrate that supports a phosphor layer and a reflection layer. The phosphor layer includes phosphor particles that convert the s-polarization component incident from the polarization beam splitter into yellow fluorescent light and emit it. The substrate of the fluorescent element is thermally connected to a main body portion that is a metal case member. The quarter-wave plate is disposed between the polarization beam splitter and the diffusive reflection element. The diffusive reflection element diffusely reflects the circularly polarized light beam incident from the polarization beam splitter via the quarter-wave plate.

[0003] The light beam of the s-polarized light component emitted from the polarization separation element is converted into fluorescent light by the fluorescent element, and the fluorescent light passes through the polarization separation element. The light beam of the p-polarized light component emitted from the polarization separation element passes through a quarter-wave plate and is converted into a circularly polarized light beam, and then enters the diffuse reflection element. Since the polarization rotation direction of the circularly polarized light beam reflected by the diffuse reflection element is opposite to the polarization rotation direction of the circularly polarized light beam incident on the diffuse reflection element, the circularly polarized light beam reflected by the diffuse reflection element is converted into a light beam of the s-polarized light component by the quarter-wave plate. Then, the converted light beam of the s-polarized light component is reflected by the polarization separation element. At the polarization separation element, the light beam of the s-polarized light component and the fluorescent light are combined to generate white illumination light, and the white illumination light is emitted from the light source device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the light source device described in Patent Document 1, the phosphor layer is supported by a substrate, and the substrate is thermally connected to a metal case member. Therefore, the heat generated in the phosphor layer is transmitted to the case member through the substrate. In such a configuration of the light source device, due to the presence of the substrate, the heat transfer efficiency from the phosphor layer to the case member is not sufficiently high, and when the amount of incident light on the phosphor layer increases, there are problems such as a decrease in wavelength conversion efficiency and deterioration of the phosphor layer. Due to such problems, a configuration that can transfer heat well from the phosphor has been desired.

Means for Solving the Problems

[0006] The wavelength conversion device according to the first aspect of the present disclosure is a heat source, includes a phosphor that emits light in a specific wavelength band, and a planar heat receiving portion on which the phosphor is disposed, and a cooling device that dissipates heat of the phosphor heated by the heat receiving portion.

[0007] The light source device according to the second aspect of the present disclosure includes the wavelength conversion device according to the first aspect and a light source that emits light incident on the phosphor.

[0008] The projector according to the third aspect of the present disclosure includes the light source device according to the second aspect, a light modulation element that modulates light from the light source device, and a projection optical device that projects the light modulated by the light modulation element.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0010] [First Embodiment] Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings. [Schematic Configuration of Projector] FIG. 1 is a schematic diagram showing the configuration of a projector 1 according to this embodiment. The projector 1 according to this embodiment projects image light according to image information. As shown in FIG. 1, the projector 1 includes an exterior housing 2 and an image projection device 3 housed in the exterior housing 2. In addition, although not shown, the projector 1 includes a control device that controls the operation of the projector 1, a power supply device that supplies power to the electronic components of the projector 1, and a cooling device that cools the components to be cooled of the projector 1.

[0011] [Configuration of Exterior Housing] The exterior housing 2 has a front portion 21, a rear portion 22, a left side portion 23, and a right side portion 24, and a top portion and a bottom portion (not shown), and is formed in an overall substantially rectangular parallelepiped shape. The front portion 21 and the rear portion 22 constitute surfaces on opposite sides of the exterior housing 2. The front portion 21 has an opening that exposes the end portion on the light emitting side of the projection optical device 36 described later. The left side portion 23 and the right side portion 24 constitute surfaces on opposite sides of the exterior housing 2. The top portion and the bottom portion constitute surfaces on opposite sides of the exterior housing 2. In the following description, three mutually orthogonal directions are defined as the +X direction, the +Y direction, and the +Z direction. Further, the +Z direction is the direction from the rear portion 22 toward the front portion 21, the +X direction is the direction from the right side portion 24 toward the left side portion 23, and the +Y direction is the direction from the bottom portion toward the top portion. Although not shown, the direction opposite to the +X direction is the -X direction, the direction opposite to the +Y direction is the -Y direction, and the direction opposite to the +Z direction is the -Z direction. The axis along the +X direction is the X axis, the axis along the +Y direction is the Y axis, and the axis along the +Z direction is the Z axis.

[0012] [Configuration of Image Projection Device] The image projection device 3 forms image light corresponding to the input image information and projects the formed image light. The image projection device 3 includes a light source device 4, an image light generation device 30, and a projection optical device 36. The light source device 4 emits illumination light to the homogenizing optical system 31. The configuration of the light source device 4 will be described in detail later.

[0013] The image light generation device 30 generates image light from the illumination light emitted from the light source device 4. The image light generation device 30 includes a homogenizing optical system 31, a color separation optical system 32, a relay optical system 33, a light modulation device 34, and a housing for optical components 35. The homogenizing optical system 31 homogenizes the illumination light emitted from the light source device 4. The homogenized illumination light illuminates the modulation region of a light modulation element 343, which will be described later, via the color separation optical system 32 and the relay optical system 33. The homogenizing optical system 31 includes two lens arrays 311 and 312, a polarization conversion element 313, and a superimposing lens 314. The color separation optical system 32 separates the illumination light incident from the homogenizing optical system 31 into red, green, and blue color lights. The color separation optical system 32 includes two dichroic mirrors 321 and 323, a reflection mirror 322 that reflects the blue light separated by the dichroic mirror 321, a lens 324 disposed between the dichroic mirror 321 and the reflection mirror 322, and a lens 325 disposed between the dichroic mirrors 321 and 323.

[0014] The relay optical system 33 is provided in the optical path of the red light, which is longer than the optical paths of the other color lights, and suppresses the loss of the red light. The relay optical system 33 includes an incident-side lens 331, relay lenses 333, and reflection mirrors 332 and 334. In the present embodiment, the relay optical system 33 is configured to guide the red light. However, the present invention is not limited to this, and for example, a color light having a longer optical path than the other color lights may be the blue light, and the blue light may be guided to the relay optical system 33.

[0015] The light modulation device 34 modulates incident red, green, and blue light of each color, synthesizes the modulated light of each color, and forms image light. The light modulation device 34 includes three field lenses 341 provided according to the incident color light, three incident-side polarizing plates 342, three light modulation elements 343, three exit-side polarizing plates 344, and one color synthesis optical system 345.

[0016] The light modulation element 343 modulates the light from the light source device 4 to form image light. Specifically, the light modulation element 343 modulates the color light incident from the incident-side polarizing plate 342 according to an image signal, and emits the modulated color light. The three light modulation elements 343 include a light modulation element 343R that modulates red light, a light modulation element 343G that modulates green light, and a light modulation element 343B that modulates blue light. As the light modulation element 343, a transmissive liquid crystal panel can be exemplified.

[0017] The color synthesis optical system 345 synthesizes the three color lights modulated by the light modulation elements 343R, 343G, and 343B. The image light synthesized by the color synthesis optical system 345 is incident on the projection optical device 36. In the present embodiment, the color synthesis optical system 345 is configured by a substantially rectangular cross dichroic prism, but may be configured by a plurality of dichroic mirrors.

[0018] The optical component housing 35 houses the above-described homogenization optical system 31, color separation optical system 32, and relay optical system 33 inside. In the image projection device 3, an optical axis Ax is set in terms of design, and the optical component housing 35 holds the homogenization optical system 31, color separation optical system 32, relay optical system 33, and light modulation device 34 at a predetermined position on the optical axis Ax. The light source device 4, light modulation device 34, and projection optical device 36 are arranged at predetermined positions on the optical axis Ax. The projection optical device 36 projects the image light incident from the light modulation device 34 onto a projection surface such as a screen. That is, the projection optical device 36 projects the image light formed by the light modulation device 34. The projection optical device 36 can be, for example, a combination lens including a plurality of lenses and a lens barrel that houses the plurality of lenses.

[0019] [Configuration of Light Source Device] FIG. 2 is a cross-sectional view showing the configuration of the light source device 4. Specifically, FIG. 2 is a view showing a cross-section of the light source device 4 along the XZ plane. The light source device 4 emits illumination light WL in the +X direction toward the homogenizing optical system 31. As shown in FIG. 2, the light source device 4 includes a light source 41, a diffusion transmission part 42, a light separation part 43, a first condenser element 44, a wavelength conversion device 5A, a second condenser element 45, a diffusion optical member 46, and a light source housing 47.

[0020] An optical axis Ax1 along the Z axis and an optical axis Ax2 along the X axis are set for the light source device 4, and the optical axis Ax1 and the optical axis Ax2 are orthogonal to each other. The optical components of the light source device 4 are arranged on the optical axis Ax1 or the optical axis Ax2. Specifically, the light source 41, the diffusion transmission part 42, the light separation part 43, the first condenser element 44, and the wavelength conversion device 5A are arranged on the optical axis Ax1. The diffusion optical member 46, the second condenser element 45, and the light separation part 43 are arranged on the optical axis Ax2. That is, the light separation part 43 is arranged at the intersection of the optical axis Ax1 and the optical axis Ax2. The optical axis Ax2 is connected to the optical axis Ax of the image projection device 3 by the lens array 311 of the homogenizing optical system 31.

[0021] [Configuration of Light Source] The light source 41 emits light in the -Z direction. The light source 41 includes a light emitting element 411 and a substrate 412. The light emitting element 411 emits blue light BL. The blue light BL is excitation light that excites phosphor particles contained in the phosphor of the wavelength conversion device 5A. The light emitting element 411 is, for example, a semiconductor laser that emits laser light with a peak wavelength of 455 nm. The substrate 412 is fixed to the inner surface of the light source housing 47 while supporting the light emitting element 411. The substrate 412 receives heat from the light emitting element 411 and transfers the received heat to the heat dissipation member HD exposed to the outside of the light source housing 47. A plurality of heat pipes HP are provided on the substrate 412. The heat of the light emitting element 411 transferred to the substrate 412 is directly transferred from the substrate 412 to the heat dissipation member HD, and is also transferred from the substrate 412 to the heat dissipation member HD via the plurality of heat pipes HP.

[0022] [Configuration of the diffusion and transmission part] The diffusion and transmission part 42 diffuses the blue light BL incident from the light source 41 and emits light with a uniform illuminance distribution. The blue light BL emitted from the diffusion and transmission part 42 is incident on the light separation part 43. Examples of the configuration of the diffusion and transmission part 42 include a configuration having a hologram, a configuration in which a plurality of small lenses are arranged on a plane orthogonal to the optical axis, and a configuration in which the surface through which light passes is a rough surface. Note that, instead of the diffusion and transmission part 42, a homogenizer optical element having a pair of multi-lens arrays may be adopted in the light source device 4. On the other hand, when the diffusion and transmission part 42 is adopted, the distance from the light source 41 to the light separation part 43 can be made shorter than when the homogenizer optical element is adopted.

[0023] [Configuration of the light separation part] The light separation part 43 has the function of a half mirror that allows a part of the blue light BL incident from the light source 41 through the diffusion and transmission part 42 to pass through and reflects the other blue light BL. That is, the light separation part 43 transmits, in the -Z direction, a first partial light that is a part of the blue light BL incident from the diffusion and transmission part 42 and makes it incident on the first condenser lens 44, and reflects, in the -X direction, a second partial light that is the other blue light BL and makes it incident on the second condenser lens 45. The light separation part 43 further has the function of a dichroic mirror that reflects the fluorescent light YL incident from the wavelength conversion device 5A in the +Z direction and transmits the blue light BL incident from the diffusion optical member 46 in the +X direction.

[0024] [Configuration of the first condenser lens] The first light collecting element 44 condenses the first partial light that has passed through the light separation unit 43 onto the wavelength conversion device 5A. Further, the first light collecting element 44 collimates the fluorescent light YL incident from the wavelength conversion device 5A and makes it incident on the light separation unit 43 along the +Z direction.

[0025] [Schematic Configuration of Wavelength Conversion Device] The wavelength conversion device 5A is a reflective wavelength conversion element that diffuses and emits the converted light obtained by converting the wavelength of the incident light in a direction opposite to the light incident direction. The light emitted from the wavelength conversion device 5A is, for example, non-polarized fluorescent light YL having a peak wavelength in the range of 500 to 700 nm, and the fluorescent light YL includes green light and red light. The configuration of the wavelength conversion device 5A will be described in detail later. The fluorescent light YL emitted from the wavelength conversion device 5A passes through the first light collecting element 44 along the optical axis Ax1 and then is incident on the light separation unit 43. The fluorescent light YL incident on the light separation unit 43 is reflected in the +X direction by the light separation unit 43 and is emitted to the outside of the light source device 4 along the optical axis Ax2.

[0026] [Configuration of Second Light Collecting Element] The second light collecting element 45 condenses the second partial light incident from the light separation unit 43 onto the diffusing optical member 46. The second light collecting element 45 collimates the blue light BL incident from the diffusing optical member 46 and makes it incident on the light separation unit 43 along the +Z direction.

[0027] [Configuration of Diffusing Optical Member] The diffusing optical member 46 reflects and diffuses the blue light BL incident from the second light collecting element 45 at a diffusion angle substantially the same as the diffusion angle of the fluorescent light YL emitted from the wavelength conversion device 5A, or at a diffusion angle slightly smaller than the diffusion angle of the fluorescent light YL. That is, the diffusing optical member 46 reflects and diffuses the incident light without converting the wavelength of the incident light. The blue light BL reflected in the +X direction by the diffusing optical member 46 passes through the second light collecting element 45, then passes through the light separation unit 43 in the +X direction, and is emitted to the outside of the light source device 4 together with the fluorescent light YL. As described above, the illumination light WL emitted to the outside of the light source device 4 is white light in which blue light BL and fluorescent light YL including green light and red light are mixed. The illumination light WL is emitted from the light source device 4 in the +X direction through the passage port 471 provided in the light source housing 47.

[0028] [Configuration of Light Source Housing] The light source housing 47 is the housing of the light source device 4 and is one of the internal housings housed inside the exterior housing 2. The light source housing 47 houses the light source 41, the diffusion transmission part 42, the light separation part 43, the first condenser element 44, the phosphor 51 of the wavelength conversion device 5A, the second condenser element 45, and the diffusion optical member 46. In the present embodiment, the light source housing 47 is a sealed housing in which dust hardly enters. However, the present invention is not limited to this, and the light source housing 47 only needs to be able to house the above-described optical components.

[0029] The light source housing 47 has a passage port 471 and an opening 472. The passage port 471 is an opening through which the illumination light WL passes through the light source housing 47. A support member 54 (to be described later) of the wavelength conversion device 5A is disposed in the opening 472. More specifically, the support member 54 is fitted into the opening 472, and a sealing member (not shown) is provided between the inner edge of the opening 472 and the peripheral edge of the support member 54, thereby maintaining the airtightness inside the light source housing 47.

[0030] [Detailed Configuration of Wavelength Conversion Device] FIG. 3 is a perspective view showing the wavelength conversion device 5A as viewed from the incident side of the excitation light. FIG. 4 is a side view showing the wavelength conversion device 5A as viewed from the incident side of the excitation light. As described above, the wavelength conversion device 5A emits the fluorescent light YL whose wavelength has been converted from the incident blue light BL in the direction opposite to the incident direction of the blue light BL. As shown in FIGS. 3 and 4, the wavelength conversion device 5A includes a phosphor 51 and a cooling device 52A.

[0031] [Configuration of Phosphor] The phosphor 51 emits light in a specific wavelength band. As described above, the phosphor 51 is excited by the incidence of blue light BL, which is excitation light, and emits fluorescence YL. The phosphor 51 has, for example, a phosphor ceramic containing phosphor particles, and a reflective layer formed on a surface of the phosphor ceramic opposite to the incidence side of the excitation light. The phosphor 51 is disposed at a position where the blue light BL is condensed by the first condenser 44. The phosphor 51 is a heat source and is a cooling target. The phosphor 51 is provided on the heat receiving portion 531 of the cooling device 52A. Note that the phosphor 51 is a heat source that generates heat upon the incidence of excitation light.

[0032] [Configuration of Cooling Device] The cooling device 52A supports the phosphor 51. The cooling device 52A receives heat from the phosphor 51, dissipates the received heat to the outside of the light source housing 47, and cools the phosphor 51. The cooling device 52A includes a heat transport member 53, a support member 54, a heat dissipation member 55, a duct 56, and a fan 57.

[0033] [Configuration of Heat Transport Member] The heat transport member 53 is disposed on the support member 54 along the Y axis while supporting the phosphor 51. The heat transport member 53 transports the heat received from the phosphor 51 to the heat dissipation member 55 via the support member 54. The heat transport member 53 has a heat receiving portion 531 and a heat dissipation portion 532. In the present embodiment, the heat transport member 53 is a heat pipe in which a working fluid is enclosed. That is, the heat transport member 53 evaporates the liquid-phase working fluid by the heat received at the heat receiving portion 531 to change the liquid-phase working fluid into a gas-phase working fluid, and dissipates the heat of the gas-phase working fluid from the heat dissipation portion 532 to change the gas-phase working fluid into a liquid-phase working fluid.

[0034] The heat receiving part 531 constitutes the first planar surface 53A facing the +Z direction in the heat transport member 53. That is, the heat receiving part 531 is configured in a planar shape. The phosphor 51 is fixed to the heat receiving part 531 by either metal bonding with solder or firing and fixing of the metal. The heat receiving part 531 receives heat from the phosphor 51. Thus, the cooling device 52A has the heat receiving part 531 that receives heat from the phosphor 51. The heat radiating part 532 is composed of a second surface 53B which is a flat surface facing the -Z direction in the heat transport member 53, a third surface 53C which is a convex curved surface facing the +X direction, and a fourth surface 53D which is a convex curved surface facing the -X direction. The second surface 53B is the surface on the opposite side of the first surface 53A in the heat transport member 53. The heat radiating part 532 radiates the heat of the phosphor 51 to the heat radiating member 55 via the support member 54.

[0035] [Configuration of the support member] The support member 54 is disposed in the opening 472 of the light source housing 47 while supporting the phosphor 51. The support member 54 is connected to the heat radiating member 55 in a heat transferable manner, and transfers the heat of the phosphor 51 transmitted from the heat transport member 53 to the heat radiating member 55. The support member 54 has a first surface 54A facing the +Z direction and a second surface 54B facing the -Z direction, and the first surface 54A and the second surface 54B are surfaces on opposite sides of each other in the support member 54. The first surface 54A is provided with a groove 541 that is recessed in the -Z direction and extends along the Y axis. The heat transport member 53 is disposed in the groove 541. The heat radiating part 532 of the heat transport member 53 is connected to the inner surface of the groove 541 in a heat transferable manner. That is, the heat of the phosphor 51 radiated from the heat transport member 53 is transmitted to the inner surface of the groove 541. A substantially flat surface to which the base 551 of the heat radiating member 55 is connected is provided on the second surface 54B. The second surface 54B is exposed to the outside of the light source housing 47 when the support member 54 is fitted into the opening 472. The support member 54 is a metallic member such as aluminum and copper, and transfers the heat of the phosphor 51 transmitted to the groove 541 of the first surface 54A to the base 551 of the heat radiating member 55 connected to the second surface 54B.

[0036] [Configuration of the heat radiating member] The heat radiating member 55 is fixed to the second surface 54B exposed outside the light source housing 47 and is disposed inside a duct 56 combined with the light source housing 47. The heat radiating member 55 is a heat sink having a base portion 551 and a plurality of fins 552 extending from the base portion 551. The base portion 551 is formed in a flat plate shape having a first surface 551A facing the +Z direction and a second surface 551B facing the -Z direction. The first surface 551A and the second surface 551B are surfaces on opposite sides of the base portion 551, and the first surface 551A is connected to the second surface 54B. Each of the plurality of fins 552 extends in the -Z direction from the second surface 551B of the base portion 551 and is arranged side by side along the Y axis. The heat of the phosphor 51 transmitted from the support member 54 to the base portion 551 is transmitted to the plurality of fins 552. At least a part of the plurality of fins 552 is disposed inside the duct 56, and the plurality of fins 552 transmit the heat of the phosphor 51 to the cooling gas flowing inside the duct 56. Thereby, the heat radiating member 55, and thus the phosphor 51, is cooled.

[0037] [Configuration of Duct] FIG. 5 is a perspective view showing the wavelength conversion device 5A as viewed from the side opposite to the incident side of the excitation light. The duct 56 is configured such that a cooling gas can flow therethrough, and houses a part of the heat radiating member 55 and a fan 57 therein. That is, the duct 56 circulates the cooling gas sent out from the fan 57 to the heat radiating member 55 disposed inside the duct 56 and discharges it. The duct 56 has an inlet 561 shown in FIGS. 2 and 5, and also has openings 562 and an outlet 563 shown in FIGS. 2 to 4.

[0038] As shown in FIGS. 2 and 5, the inlet 561 is provided in the duct 56 in the +X direction and the -Z direction and opens in the -Z direction. The inlet 561 introduces the gas outside the duct 56 into the duct 56 as a cooling gas. As shown in FIGS. 3 and 4, the opening 562 is provided substantially at the center of the X-axis of the surface facing the +Z direction in the duct 56. The opening 562 is a rectangular opening when viewed from the +Z direction, and the -Z direction portion of the heat radiating member 55 is inserted from the +Z direction. Thereby, the -Z direction portions of the plurality of fins 552 are arranged in the duct 56. As shown in FIGS. 2 and 3, the discharge port 563 is provided on the surface of the duct 56 facing the -X direction and opens in the -X direction. The discharge port 563 discharges the cooling gas sent from the fan 57 in the -X direction and flowing through the heat radiating member 55 to the outside of the duct 56.

[0039] [Configuration of Fan] The fan 57 is arranged in the -X direction portion in the duct 56 to circulate the cooling gas in the duct 56. The fan 57 is a centrifugal fan such as a sirocco fan, and is arranged such that the intake surface 571 faces the -Z direction and the discharge surface 572 faces the -X direction. The fan 57 sucks the gas outside the duct 56 through the inlet 561 and sends the sucked cooling gas to the heat radiating member 55 located in the -X direction. The cooling gas sent to the heat radiating member 55 flows between the plurality of fins 552 extending along the X-axis and receives heat from the plurality of fins 552. Thereby, the plurality of fins 552, and thus the phosphor 51, are cooled. The cooling gas heated by the plurality of fins 552 further flows in the -X direction and is discharged to the outside of the duct 56 through the discharge port 563.

[0040] [Effects of the First Embodiment] The projector 1 according to the present embodiment described above has the following effects. The projector 1 includes a light source device 4, a light modulation element 343, and a projection optical device 36. The light modulation element 343 modulates the light from the light source device 4. The projection optical device 36 projects the light modulated by the light modulation element 343. The light source device 4 includes a wavelength conversion device 5A and a light source 41 that emits light incident on the phosphor 51 of the wavelength conversion device 5A. The wavelength conversion device 5A includes a phosphor 51 and a cooling device 52A. The phosphor 51 is a heat source and emits light in a specific wavelength band. The cooling device 52A has a planar heat receiving portion 531 on which the phosphor 51 is disposed, and dissipates the heat of the phosphor 51 heated by the heat receiving portion 531.

[0041] According to such a configuration, the cooling device 52A can receive the heat generated by the phosphor 51 at the heat receiving portion 531 and dissipate the received heat, thereby cooling the phosphor 51. In such a cooling device 52A, since the heat receiving portion 531 is configured in a planar shape, the contact area between the heat receiving portion 531 and the phosphor 51 can be increased, and since the phosphor 51 is disposed on the heat receiving portion 531, heat can be efficiently transferred from the phosphor 51 to the heat receiving portion 531. Therefore, the phosphor 51 can be effectively cooled. With such a wavelength conversion device 5A, the amount of light incident on the wavelength conversion device 5A can be increased, so that a light source device 4 capable of emitting high-intensity light can be configured, and a projector 1 capable of projecting high-intensity image light can be configured.

[0042] In the wavelength conversion device 5A, the cooling device 52A includes a heat transport member 53 and a heat dissipation member 55. The heat dissipation member 55 dissipates the transferred heat. The heat transport member 53 evaporates the liquid-phase working fluid by the heat received at the heat receiving portion 531 to change the liquid-phase working fluid into a gas-phase working fluid, and dissipates the heat of the gas-phase working fluid to the heat dissipation member 55 via the support member 54 to change the gas-phase working fluid into a liquid-phase working fluid. The heat receiving portion 531 is provided on the heat transport member 53. According to such a configuration, the working fluid that has changed from the liquid phase to the gas phase due to the heat received at the heat receiving portion 531 changes from the gas phase to the liquid phase by transferring heat to the heat dissipation member 55. According to this, the heat received at the heat receiving portion 531 can be quickly transferred to the heat dissipation member 55 by the working fluid. Therefore, the heat of the phosphor 51 can be quickly transferred to the heat dissipation member 55, so that the cooling efficiency of the phosphor 51 can be increased.

[0043] The wavelength conversion device 5A further includes a support member 54 having a groove 541 in which the heat transport member 53 is disposed. The heat transport member 53 is a heat pipe. According to such a configuration, since the heat pipe, which is the heat transport member 53, is disposed in the groove 541 of the support member 54, the heat transport member 53 can be stably disposed.

[0044] In the wavelength conversion device 5A, the support member 54 receives heat from the heat transport member 53, and the heat dissipation member 55 is connected to the support member 54. According to such a configuration, heat can be transferred from the heat transport member 53 disposed in the groove 541 to the support member 54, and the support member 54 can be used as another heat dissipation member. Further, since the heat dissipation member 55 and the support member 54 are connected, the heat transferred to the support member 54 can be transferred to the heat dissipation member 55. Therefore, the heat transport path from the phosphor 51 to the heat dissipation member 55 can be increased, so that the heat transfer efficiency from the phosphor 51 to the heat dissipation member 55 can be increased, and the cooling efficiency of the phosphor 51 can be increased.

[0045] The wavelength conversion device 5A includes a duct 56 and a fan 57. Inside the duct 56, the heat dissipation member 55 is disposed. The duct 56 allows a cooling gas to flow inside. The fan 57 circulates the cooling gas in the duct 56. According to such a configuration, since the heat dissipation member 55, to which the heat of the phosphor 51 is transferred, is disposed in the duct 56 in which the cooling gas circulates by the fan 57, the heat dissipation member 55 can be effectively cooled, and thus the cooling efficiency of the phosphor 51 can be increased.

[0046] In the wavelength conversion device 5A, the phosphor 51 is fixed to the heat receiving portion 531 by either metal bonding with solder or baking and fixing of the metal. According to such a configuration, the thermal resistance between the phosphor 51 and the heat receiving portion 531 can be lowered, so that heat can be favorably transferred from the phosphor 51 to the heat receiving portion 531. Therefore, the cooling efficiency of the phosphor 51 can be increased.

[0047] [Second Embodiment] Next, a second embodiment of the present disclosure will be described. The projector according to this embodiment has the same configuration as the projector 1 according to the first embodiment, but the configuration of the heat transport member and the arrangement of the heat dissipation member are different. In the following description, parts that are the same as or substantially the same as the parts already described will be given the same reference numerals and the description thereof will be omitted.

[0048] [Schematic Configuration of Projector and Light Source Device] FIG. 6 is a perspective view showing a wavelength conversion device 5B included in the projector according to this embodiment, and FIG. 7 is a cross-sectional view of the wavelength conversion device 5B viewed from the +Y direction. In FIG. 6, the duct 56 and the fan 57 are not shown. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it includes the wavelength conversion device 5B shown in FIGS. 6 and 7 instead of the wavelength conversion device 5A. That is, the light source device 4 according to this embodiment includes the wavelength conversion device 5B instead of the wavelength conversion device 5A.

[0049] [Configuration of Wavelength Conversion Device] Similar to the wavelength conversion device 5A according to the first embodiment, the wavelength conversion device 5B emits the fluorescence YL obtained by converting the wavelength of the incident blue light BL in a direction opposite to the incident direction of the blue light BL. The wavelength conversion device 5B has the same configuration and functions as the wavelength conversion device 5A, except that it includes a cooling device 52B instead of the cooling device 52A. That is, the wavelength conversion device 5B includes a phosphor 51 and a cooling device 52B.

[0050] [Configuration of Cooling Device] Similar to the cooling device 52A according to the first embodiment, the cooling device 52B supports the phosphor 51 and cools the phosphor 51. The cooling device 52B includes a heat transport member 63, a support member 64, a heat dissipation member 65, a duct 66, and a fan 57.

[0051] [Configuration of Heat Transport Member] Similar to the heat transfer member 53, the heat transfer member 63 supports the phosphor 51 and transfers the heat received from the phosphor 51 to the support member 64 and the heat dissipation member 65. In the present embodiment, the heat transfer member 63 is a heat pipe formed in a substantially U shape, and a working fluid is enclosed therein. The heat transfer member 63 has a first extending portion 631 along the X-axis, a first bending portion 632, a second extending portion 633, a second bending portion 634, and a third extending portion 635.

[0052] The first extending portion 631 is a portion extending along the X-axis and is provided at the center of the heat transfer member 63 on the X-axis. The first extending portion 631 has a heat receiving portion 6311 and a heat dissipating portion 6312. The heat receiving portion 6311 constitutes a planar first surface 631A of the first extending portion 631 facing in the +Z direction. That is, the heat receiving portion 6311 is formed in a planar shape. The phosphor 51 is fixed to the heat receiving portion 6311 by either metal bonding with solder or firing and fixing of metal, and the heat receiving portion 6311 receives heat from the phosphor 51. Thus, the cooling device 52B has the heat receiving portion 6311 that receives heat from the phosphor 51. The heat dissipating portion 6312 is the outer peripheral surface of the first extending portion 631 facing the groove 641 when the first extending portion 631 is disposed in the groove 641 provided in the support member 64. The heat dissipating portion 6312 dissipates a part of the heat of the phosphor 51 heated at the heat receiving portion 6311 to the support member 64.

[0053] The first bending portion 632 is provided at the -X direction end of the first extending portion 631 and is curved so as to be located in the -Z direction as it goes in the -X direction. The second extending portion 633 extends linearly in the -Z direction from the -Z direction end of the first bending portion 632. The first heat dissipation member 65A of the heat dissipation member 65 is provided on the second extending portion 633 so as to be heat transferable. The second extending portion 633 is a heat dissipating portion that dissipates another part of the heat of the phosphor 51 heated at the heat receiving portion 6311 to the first heat dissipation member 65A. The second bending portion 634 is provided at the +X direction end of the first extending portion 631 and is curved so as to be located in the -Z direction as it goes in the +X direction. The third extending portion 635 extends linearly in the -Z direction from the end portion in the -Z direction of the second bending portion 634. The second heat radiating member 65B of the heat radiating member 65 is provided on the third extending portion 635 in a heat-transferable manner. The third extending portion 635 is a heat radiating portion that radiates another part of the heat of the phosphor 51 heated at the heat receiving portion 6311 to the second heat radiating member 65B.

[0054] [Configuration of the support member] The support member 64 is disposed in the opening 472 of the light source housing 47 in a state of supporting the heat transport member 63 to which the phosphor 51 is fixed. Similar to the support member 54, the support member 64 has a first surface 64A facing the +Z direction and a second surface 64B facing the -Z direction. On the first surface 64A, a concave groove 641 extending along the X axis and recessed in the -Z direction is formed. That is, the support member 64 has the groove 641. The first extending portion 631 of the heat transport member 63 is disposed in the groove 641. The second surface 64B is the surface of the support member 64 on the side opposite to the first surface 64A. In the present embodiment, a gap is formed between the second surface 64B and the duct 66. That is, the support member 64 is disposed at a distance from the duct 66. However, the present invention is not limited to this, and the support member 64 may be connected to the duct 66 such that the second surface 64B contacts the surface of the duct 66 facing the +Z direction.

[0055] [Configuration of the heat radiating member] The heat radiating member 65 radiates the heat of the phosphor 51 transmitted by the heat transport member 63. Specifically, the heat radiating member 65 is disposed in the duct 66 and radiates the transmitted heat of the phosphor 51 to the cooling gas flowing from the fan 57. The heat radiating member 65 includes a first heat radiating member 65A and a second heat radiating member 65B provided at both ends of the heat transport member 63, respectively. The first heat radiating member 65A is attached to the second extending portion 633 of the heat transport member 63 in a heat-transferable manner. The first heat radiating member 65A has a plurality of fins 65A1. The second heat radiating member 65B is attached to the third extending portion 635 of the heat transport member 63 in a heat-transferable manner. The second heat radiating member 65B has a plurality of fins 65B1. Each of the plurality of fins 65A1 is orthogonal to the -Z direction which is the extending direction of the second extending portion 633. Each of the plurality of fins 65B1 is orthogonal to the -Z direction which is the extending direction of the third extending portion 635. That is, between the plurality of fins 65A1 and between the plurality of fins 65B1, the cooling gas sent from the fan 57 in the -X direction can flow.

[0056] [Configuration of Duct] Similar to the duct 56, the duct 66 guides the cooling gas sent from the fan 57 disposed inside to the heat dissipation member 65, and discharges the cooling gas whose heat has been transferred by the heat dissipation member 65. Similar to the duct 56, the duct 66 has an inlet 561 and an outlet 563 (not shown in FIG. 7), and also has insertion ports 661 and 662 shown in FIG. 7. The insertion ports 661 and 662 are provided on the surface of the duct 66 facing the +Z direction. The first curved portion 632 of the heat transport member 63 is inserted through the insertion port 661. The second curved portion 634 of the heat transport member 63 is inserted through the insertion port 662. Thereby, the first extending portion 631 to which the phosphor 51 is fixed is disposed outside the duct 66, and the heat transport member 63 is disposed such that the second extending portion 633 to which the first heat dissipation member 65A is attached and the third extending portion 635 to which the second heat dissipation member 65B is attached are disposed inside the duct 66.

[0057] [Heat Dissipation of Phosphor] Of the heat of the phosphor 51 received by the heat receiving portion 6311 of the heat transport member 63, part of the heat is transferred to the support member 64, and the other heat is transferred to the second extending portion 633 and the third extending portion 635 by the working fluid in the heat transport member 63, and then transferred to each of the heat dissipation members 65A and 65B. Between the plurality of fins 65A1 of the first heat dissipation member 65A and between the plurality of fins 65B1 of the second heat dissipation member 65B, the cooling gas sent from the fan 57 in the -X direction flows, whereby each of the heat dissipation members 65A and 65B, and thus the phosphor 51, is cooled. The cooling gas that has cooled each of the fins 65A1 and 65B1 is discharged in the -X direction from an outlet 563 (not shown) of the duct 66.

[0058] [Effect of the Second Embodiment] The projector according to the present embodiment described above has the same effects as the projector 1 according to the first embodiment, and also has the following effects. In the wavelength conversion device 5B, the heat dissipation member 65 is provided at each of both ends of the heat transport member 63 which is a heat pipe. Specifically, the heat dissipation member 65 includes a first heat dissipation member 65A and a second heat dissipation member 65B. The first heat dissipation member 65A is provided at the end of the heat transport member 63 in the -X direction, and the second heat dissipation member 65B is provided at the end of the heat transport member 63 in the +X direction. According to such a configuration, the heat dissipation area of the phosphor 51 can be expanded. Also, compared with the case where a heat receiving part is provided at one end of the heat pipe and a heat dissipation member is provided at the other end, the distance between the heat receiving part 6311 and the heat dissipation member 65 can be shortened, so that the heat of the phosphor 51 can be quickly and efficiently transmitted to the heat dissipation member 65. Therefore, the cooling efficiency of the phosphor 51 can be enhanced.

[0059] [Third Embodiment] Next, a third embodiment of the present disclosure will be described. The projector according to the present embodiment has the same configuration as the projector 1 according to the first embodiment, but the heat transport member and the support member constituting the wavelength conversion device are different. In the following description, parts that are the same as or substantially the same as the parts already described will be denoted by the same reference numerals and the description thereof will be omitted.

[0060] [Schematic Configuration of Projector and Light Source Device] FIG. 8 is a cross-sectional view of the wavelength conversion device 5C included in the projector according to the present embodiment as viewed from the +Y direction. The projector according to the present embodiment includes the wavelength conversion device 5C shown in FIG. 8 instead of the wavelength conversion device 5A, and has the same configuration and function as the projector 1 according to the first embodiment. That is, the light source device 4 according to the present embodiment includes the wavelength conversion device 5C instead of the wavelength conversion device 5A.

[0061] [Configuration of Wavelength Conversion Device] Similar to the wavelength conversion devices 5A and 5B according to the first and second embodiments, the wavelength conversion device 5C emits the fluorescence YL obtained by converting the wavelength of the incident blue light BL in a direction opposite to the incident direction of the blue light BL. The wavelength conversion device 5C has the same configuration and functions as the wavelength conversion device 5A, except that it includes a cooling device 52C instead of the cooling device 52A. That is, the wavelength conversion device 5C includes a phosphor 51 and a cooling device 52C.

[0062] [Configuration of Cooling Device] Similar to the cooling device 52A according to the first embodiment, the cooling device 52C supports the phosphor 51 and cools the phosphor 51. The cooling device 52C includes a heat transfer member 73, a heat radiating member 55, a duct 56, and a fan 57. In the cooling device 52C, a support member that supports the heat transfer member and is connected to the heat radiating member is omitted, and the heat transfer member 73 and the heat radiating member 55 are connected to each other so as to be heat transferable. However, the cooling device 52C is not limited thereto and may include a support member that supports the heat transfer member 73 and the heat radiating member 55.

[0063] [Configuration of Heat Transfer Member] Similar to the heat transfer member 53 according to the first embodiment, the heat transfer member 73 supports the phosphor 51 and receives heat from the phosphor 51. The heat transfer member 73 is formed in a substantially flat plate shape, and is disposed in the opening 472 of the light source housing 47 in a state of supporting the phosphor 51, and is fixed in the opening 472. The heat transfer member 73 has a first surface 73A that is a flat surface facing the +Z direction and a second surface 73B that is a flat surface facing the -Z direction, and the first surface 73A and the second surface 73B are surfaces on opposite sides of each other in the heat transfer member 73. In addition, the heat transfer member 73 has a heat receiving portion 731 and a heat radiating portion 732.

[0064] The heat receiving part 731 is a part where the phosphor 51 is fixed on the first surface 73A either by metal bonding with solder or by baking and fixing of metal, and is configured in a planar shape. That is, the heat receiving part 731 is disposed on the first surface 73A. The heat receiving part 531 receives heat from the phosphor 51. Thus, the cooling device 52C has a heat receiving part 731 that receives heat from the phosphor 51. The heat radiating part 732 constitutes the second surface 73B, and radiates the heat of the phosphor 51 heated by the heat receiving part 731 to the first surface 551A of the base part 551 that the heat radiating member 55 connected to the second surface 73B has. Such a heat transport member 73 can be constituted by a vapor chamber in which a working fluid is enclosed, or can be constituted by a Peltier element which is a thermoelectric conversion element.

[0065] [Heat radiation of phosphor] The heat of the phosphor 51 heated by the heat receiving part 731 of the heat transport member 73 is transmitted to the heat radiating member 55 by the heat transport member 73. The heat of the phosphor 51 transmitted to the heat radiating member 55 is transmitted to a plurality of fins 552 that the heat radiating member 55 has. Similar to the cooling device 52A according to the first embodiment, between the plurality of fins 552, the cooling gas sent from the fan 57 in the -X direction circulates. Thereby, the heat radiating member 55, and thus the phosphor 51, is cooled. The cooling gas that has cooled each fin 552 is discharged in the -X direction from the discharge port 563 of the duct 56.

[0066] [Effects of the third embodiment] The projector according to the present embodiment described above has the same effects as the projector 1 according to the first embodiment, and in addition, has the following effects. In the wavelength conversion device 5C, the heat transport member 73 is a vapor chamber. The heat transport member 73 has a first surface 73A and a second surface 73B. The first surface 73A is a planar surface on which the heat receiving part 731 is disposed. The second surface 73B is a surface on the opposite side of the first surface 73A in the heat transport member 73. The heat radiating member 55 is connected to the second surface 73B. According to such a configuration, the vapor chamber has high heat diffusivity. Therefore, the heat of the phosphor 51 heated by the heat receiving portion 731 disposed on the first surface 73A can be easily transmitted to the heat radiating member 55 connected to the second surface 73B opposite to the first surface 73A. Accordingly, the heat of the phosphor 51 can be efficiently transmitted to the heat radiating member 55, and the cooling efficiency of the phosphor 51 can be increased.

[0067] Alternatively, in the wavelength conversion device 5C, the heat transport member 73 is a Peltier element. In this case, the heat transport member 73 has a flat first surface 73A that is the heat receiving portion 731 and a second surface 73B opposite to the first surface 73A. The heat radiating member 55 is connected to the second surface 73B. According to such a configuration, by applying a voltage to the Peltier element, the heat of the phosphor 51 heated at the heat receiving portion 731 disposed on the first surface 73A can be efficiently transmitted to the heat radiating member 55 fixed to the second surface 73B opposite to the first surface 73A. Accordingly, the cooling efficiency of the phosphor 51 can be increased.

[0068] [Fourth Embodiment] Hereinafter, a fourth embodiment of the present disclosure will be described. The projector according to the present embodiment has the same configuration as the projector 1 according to the first embodiment, but the configuration of the heat transport member included in the wavelength conversion device is different. In the following description, parts that are the same as or substantially the same as the parts already described are denoted by the same reference numerals, and the description thereof is omitted.

[0069] [Schematic Configuration of Projector and Light Source Device] FIG. 9 is a schematic diagram showing the configuration of a wavelength conversion device 5D included in the projector according to the present embodiment. The projector according to the present embodiment has the same configuration and function as the projector 1 according to the first embodiment, except that it includes the wavelength conversion device 5D shown in FIG. 9 instead of the wavelength conversion device 5A. That is, the light source device 4 according to the present embodiment includes the wavelength conversion device 5D instead of the wavelength conversion device 5A.

[0070] [Configuration of Wavelength Conversion Device] Similar to the wavelength conversion devices 5A, 5B, and 5C according to the first to third embodiments, the wavelength conversion device 5D emits the fluorescence YL obtained by converting the wavelength of the incident blue light BL in a direction opposite to the incident direction of the blue light BL. The wavelength conversion device 5D has the same configuration and functions as the wavelength conversion device 5A, except that it includes a cooling device 52D instead of the cooling device 52A. That is, the wavelength conversion device 5D includes a phosphor 51 and a cooling device 52D.

[0071] [Configuration of Cooling Device] Similar to the cooling devices 52A, 52B, and 52C according to the first to third embodiments, the cooling device 52D supports the phosphor 51 and cools the phosphor 51. The cooling device 52C includes a cold plate 81, a pump 82, a radiator 83, a plurality of tubular members 84, a cooling fan 85, and a heat dissipation member 86. Among these, the configuration of the cold plate 81 will be described in detail later.

[0072] Each of the plurality of tubular members 84 is configured such that a cooling medium can flow through its interior. The plurality of tubular members 84 includes tubular members 841, 842, and 843. The tubular member 841 connects the cold plate 81 and the pump 82. The tubular member 842 connects the pump 82 and the radiator 83. The tubular member 843 connects the radiator 83 and the cold plate 81. In this way, the plurality of tubular members 84 connect the cold plate 81, the pump 82, and the radiator 83 to form a circular circulation flow path for the cooling medium.

[0073] The pump 82 sends the cooling medium that has flowed through the cold plate 81 to the radiator 83. The radiator 83 cools the cooling medium flowing in from the pump 82 and circulates the cooled cooling medium to the cold plate 81. The radiator 83 has a heat receiving pipe 831 connected to the tubular member 842 and the tubular member 843, and a plurality of fins 832 provided on the heat receiving pipe 831. The heat receiving pipe 831 receives heat from the cooling medium flowing inside, and the plurality of fins 832 release the heat of the cooling medium flowing in the heat receiving pipe 831 to the outside of the heat receiving pipe 831. The cooling medium thus deprived of heat and cooled circulates to the cold plate 81 through the tubular member 843. The cooling fan 85 circulates the cooling gas through the plurality of fins 832 and cools the plurality of fins 832.

[0074] [Configuration of Cold Plate] The cold plate 81 is disposed in the opening 472 of the light source housing 47 while supporting the phosphor 51. The cold plate 81 is configured such that a cooling medium can flow inside. The cold plate 81 has a heat receiving portion 811 and heat radiating portions 812, 813, and radiates the heat received at the heat receiving portion 811 at the heat radiating portions 812, 813 provided at positions different from the heat receiving portion 811.

[0075] The heat receiving portion 811 is disposed on a part of the outer surface of the cold plate 81 and is a planar portion that receives heat from the object to be cooled by the cold plate 81. More specifically, the heat receiving portion 811 is disposed on the planar first surface 81A of the cold plate 81 facing the +Z direction. The phosphor 51 is fixed to the heat receiving portion 811 by either metal bonding with solder or firing and fixing of the metal, and the heat receiving portion 811 receives heat from the phosphor 51. Although detailed illustration is omitted, the heat radiating portion 812 is constituted by fins provided inside the cold plate 81. A part of the heat received at the heat receiving portion 811 is transmitted to the cooling medium flowing in the cold plate 81 at the heat radiating portion 812. The heat dissipation part 813 is arranged on a surface of the outer surface of the cold plate 81 different from the heat receiving part 811. Specifically, the heat dissipation part 813 is arranged on the second surface 81B of the cold plate 81 opposite to the first surface 81A on which the heat receiving part 811 is arranged in the cold plate 81. The heat dissipation part 813 dissipates another part of the heat received at the heat receiving part 811 to the heat dissipation member 86 arranged at the heat dissipation part 813. Note that the heat dissipation member 86 can be constituted by a heat sink having a plurality of fins.

[0076] [Heat dissipation of the phosphor] A part of the heat of the phosphor 51 heated by the heat receiving part 811 of the cold plate 81 is transmitted by the heat dissipation part 812 to the cooling medium flowing in the cold plate 81. The cooling medium to which the heat of the phosphor 51 is transmitted flows through the radiator 83 via the pump 82, and the heat of the cooling medium flowing through the radiator 83 is dissipated by the fins 832 of the radiator 83. The cooling medium cooled by passing through the radiator 83 flows through the cold plate 81 again. Another part of the heat of the phosphor 51 heated by the heat receiving part 811 of the cold plate 81 is dissipated by the heat dissipation part 813 to the heat dissipation member 86, and the heat dissipation member 86 dissipates the transmitted heat. In this way, the heat of the phosphor 51 is dissipated and the phosphor 51 is cooled. Note that in the circulation flow path of the cooling device 52D, the flow direction of the cooling medium may be the opposite direction to the above.

[0077] [Effects of the fourth embodiment] The projector according to the present embodiment described above has the same effects as the projector 1 according to the first embodiment, and also has the following effects. In the wavelength conversion device 5D, the cooling device 52D includes a cold plate 81 through which a cooling medium flows inside. The cold plate 81 has a planar first surface 81A on which the heat receiving part 811 is arranged. The heat receiving part 811 receives heat from the phosphor 51 fixed to the heat receiving part 811. According to such a configuration, the cold plate 81 can dissipate the heat of the phosphor 51 heated at the heat receiving portion 811 to the cooling medium flowing in the cold plate 81. Therefore, the cooling efficiency of the phosphor 51 can be improved.

[0078] The wavelength conversion device 5D includes a heat dissipation member 86 fixed to a surface different from the first surface 81A in the cold plate 81. According to such a configuration, the heat transmitted to the cold plate 81 can be dissipated to the periphery of the cold plate 81 by the heat dissipation member 86. Therefore, the heat of the phosphor 51 can be dissipated not only to the cooling medium but also to the gas around the cold plate 81 by the cold plate 81. Therefore, the cooling efficiency of the phosphor 51 can be improved.

[0079] [Fifth Embodiment] Next, a fifth embodiment of the present disclosure will be described. The projector according to the present embodiment has the same configuration as the projector 1 according to the first embodiment, but is different in that it does not include the heat transport member 53 and the support member 54, and the phosphor 51 is directly fixed to the heat dissipation member 55. In the following description, parts that are the same as or substantially the same as the parts already described will be denoted by the same reference numerals and the description thereof will be omitted.

[0080] [Schematic Configuration of Projector and Light Source Device] FIG. 10 is a cross-sectional view of the wavelength conversion device 5E included in the projector according to the present embodiment as viewed from the +Y direction. The projector according to the present embodiment has the same configuration and function as the projector 1 according to the first embodiment, except that it includes the wavelength conversion device 5E shown in FIG. 10 instead of the wavelength conversion device 5A. That is, the light source device 4 according to the present embodiment includes the wavelength conversion device 5E instead of the wavelength conversion device 5A.

[0081] [Configuration of Wavelength Conversion Device] The wavelength conversion device 5E emits the fluorescence YL obtained by converting the wavelength of the incident blue light BL in a direction opposite to the incident direction of the blue light BL, similar to the wavelength conversion devices 5A, 5B, 5C, and 5D according to the first to fourth embodiments. The wavelength conversion device 5E has the same configuration and functions as the wavelength conversion device 5A, except that it includes a cooling device 52E instead of the cooling device 52A. That is, the wavelength conversion device 5D includes a phosphor 51 and a cooling device 52E.

[0082] [Configuration of Cooling Device] Similar to the cooling device 52A according to the first embodiment, the cooling device 52E supports the phosphor 51 and cools the phosphor 51. The cooling device 52E includes a duct 56, a fan 57, and a heat radiating member 58. In other words, the cooling device 52E has the same configuration and functions as the cooling device 52A, except that it includes a heat radiating member 58 instead of the heat transport member 53, the support member 54, and the heat radiating member 55.

[0083] [Configuration of Heat Radiating Member] The heat radiating member 58 supports the phosphor 51 and radiates the heat transferred from the phosphor 51 to the cooling gas flowing in the duct 56. That is, the +Z-direction portion of the heat radiating member 58 is exposed in the light source housing 47 through the opening 472, and the -Z-direction portion of the heat radiating member 58 is exposed in the duct 56 through the opening 562. The heat radiating member 58 has a base portion 581 and a plurality of heat radiating fins 582.

[0084] The base portion 581 is formed in a substantially rectangular flat plate shape when viewed from the +Z direction and is disposed and fixed in the opening 472. The base portion 581 has a planar first surface 581A facing the +Z direction and a planar second surface 581B facing the -Z direction, and further has a planar heat receiving portion 5811 disposed on the first surface 581A and a planar heat radiating portion 5812 disposed on the second surface 581B. Note that the first surface 581A and the second surface 581B are surfaces on opposite sides of the base portion 581. The phosphor 51 is fixed to the first surface 581A by either metal bonding with solder or firing and fixing of metal. The heat receiving portion 5811 receives the heat of the phosphor 51 fixed to the first surface 581A. The heat radiating part 5812 radiates the heat of the phosphor 51 heated at the heat receiving part 5811 to a plurality of heat radiating fins 582.

[0085] The plurality of heat radiating fins 582 are provided side by side along the Y axis on the second surface 581B, and each of the plurality of heat radiating fins 582 extends in the -Z direction from the second surface 581B. The portions in the -Z direction of the plurality of heat radiating fins 582 are arranged in the duct 56. Therefore, the plurality of heat radiating fins 582 radiate the heat of the phosphor 51 heated at the heat receiving part 5811 to the cooling gas flowing in the -X direction in the duct 56 by the fan 57. That is, the plurality of heat radiating fins 582 radiate the heat of the phosphor 51 transmitted from the heat radiating part 5812 to the cooling gas flowing in the duct 56. Thereby, the phosphor 51 is cooled.

[0086] [Effects of the Fifth Embodiment] The projector according to the present embodiment described above has the same effects as the projector 1 according to the first embodiment, and also has the following effects. In the wavelength conversion device 5E, the cooling device 52E includes a heat radiating member 58 that radiates the transmitted heat. The heat radiating member 58 includes a base portion 581 and heat radiating fins 582. The base portion 581 has a planar first surface 581A on which the heat receiving portion 5811 is disposed, and a second surface 581B opposite to the first surface 581A. The heat radiating fins 582 are provided on the second surface 581B. According to such a configuration, the heat of the phosphor 51 is received at the heat receiving part 5811 disposed on the first surface 581A, and is radiated by the heat radiating fins 582 provided on the second surface 581B opposite to the first surface 581A. According to this, since the heat of the phosphor 51 can be efficiently transmitted to the heat radiating fins 582, the cooling efficiency of the phosphor 51 can be increased.

[0087] [Modifications of the Embodiment] The present disclosure is not limited to the above-described embodiments, and modifications, improvements, etc. within the scope that can achieve the object of the present disclosure are included in the present disclosure. In the above-described first, second, third, and fifth embodiments, the cooling devices 52A, 52B, 52C, and 52E are provided with ducts 56 and 66 that house the heat dissipation members 55, 58, and 65. However, the present invention is not limited to this, and the cooling devices 52A, 52B, 52C, and 52E may not be provided with the ducts 56 and 66. Further, the cooling devices 52A, 52B, 52C, and 52E are provided with fans 57 that circulate cooling gas within the ducts 56 and 66. However, the present invention is not limited to this, and the fans 57 may be omitted, and cooling gas that cools other objects to be cooled may circulate through the heat dissipation members 55, 58, and 65.

[0088] In the above-described embodiments, the projector is provided with three light modulation elements 343B, 343G, and 343R. However, the present invention is not limited to this, and the present disclosure is also applicable to projectors provided with two or fewer or four or more light modulation elements. In the above-described embodiment, the image projection device 3 has a substantially L-shaped configuration shown in FIG. 1. However, the present invention is not limited to this, and for example, a substantially U-shaped configuration may be used, and the optical components employed in the image projection device and the layout of the optical components can be changed as appropriate.

[0089] In the above-described embodiments, the light modulation element 343 has a transmissive liquid crystal panel in which the light incident surface and the light exit surface are different. However, the present invention is not limited to this, and the light modulation element may have a reflective liquid crystal panel in which the light incident surface and the light exit surface are the same. Further, any light modulation element that can modulate an incident light beam to form an image according to image information may be used, such as a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like, and a light modulation element other than liquid crystal may be used.

[0090] In the above-described embodiments, an example in which the light source device 4 provided with the wavelength conversion devices 5A, 5B, 5C, 5D, and 5E is applied to a projector has been given. However, the present invention is not limited to this, and the light source device according to the present disclosure may be used in lighting fixtures and headlamps of automobiles and the like.

[0091] [Summary of the Present Disclosure] The summary of the present disclosure is appended below. [Appendix 1] A phosphor that is a heat source and emits light in a specific wavelength band, A cooling device having a planar heat receiving portion on which the phosphor is disposed, and dissipating heat of the phosphor heated by the heat receiving portion. A wavelength conversion device characterized by the above. According to such a configuration, the cooling device can cool the phosphor by receiving the heat generated by the phosphor at the heat receiving portion and dissipating the received heat. In such a cooling device, since the heat receiving portion is configured in a planar shape, the contact area between the heat receiving portion and the phosphor can be increased, and since the phosphor is disposed on the heat receiving portion, heat can be efficiently transferred from the phosphor to the heat receiving portion. Therefore, the phosphor can be effectively cooled.

[0092] [Appendix 2] In the wavelength conversion device according to Appendix 1, The cooling device is A heat radiating member that radiates the transferred heat, A heat transport member that evaporates a liquid-phase working fluid by heat received at the heat receiving portion to change the liquid-phase working fluid to a gas-phase working fluid, and radiates heat of the gas-phase working fluid to the heat radiating member to change the gas-phase working fluid to the liquid-phase working fluid. The heat receiving portion is provided on the heat transport member. A wavelength conversion device characterized by the above. According to such a configuration, the working fluid changed from the liquid phase to the gas phase by heat received at the heat receiving portion changes from the gas phase to the liquid phase by transferring heat to the heat radiating member. According to this, the heat received at the heat receiving portion can be quickly transferred to the heat radiating member by the working fluid. Therefore, since the heat of the phosphor can be quickly transferred to the heat radiating member, the cooling efficiency of the phosphor can be increased.

[0093] [Appendix 3] In the wavelength conversion device according to Appendix 2, Further comprising a support member having a groove in which the heat transport member is disposed, The heat transport member is a heat pipe. A wavelength conversion device characterized by the following. According to such a configuration, since the heat transport member, which is a heat pipe, is arranged in the groove of the support member, the heat transport member can be stably arranged.

[0094] [Appendix 4] In the wavelength conversion device described in Appendix 3, the support member receives heat from the heat transport member, the heat dissipation member is connected to the support member, A wavelength conversion device characterized by the following. According to such a configuration, heat can be transferred from the heat transport member arranged in the groove to the support member, and the support member can be used as another heat dissipation member. Also, since the heat dissipation member and the support member are connected, the heat transferred to the support member can be transferred to the heat dissipation member. Therefore, the heat transport path from the phosphor to the heat dissipation member can be increased, so the heat transfer efficiency from the phosphor to the heat dissipation member can be increased, and the cooling efficiency of the phosphor can be increased.

[0095] [Appendix 5] In the wavelength conversion device described in Appendix 3 or Appendix 4, the heat dissipation member is provided at each of both ends of the heat pipe, A wavelength conversion device characterized by the following. According to such a configuration, the heat dissipation area of the phosphor can be expanded. Also, compared with the case where a heat receiving part is provided at one end of the heat pipe and a heat dissipation member is provided at the other end, the distance between the heat receiving part and the heat dissipation member can be shortened, so the heat of the phosphor can be transferred to the heat dissipation member quickly and efficiently. Therefore, the cooling efficiency of the phosphor can be increased.

[0096] [Appendix 6] In the wavelength conversion device described in Appendix 2, the heat transport member is a vapor chamber, the vapor chamber has a planar first surface on which the heat receiving part is arranged, and a second surface on the opposite side of the first surface, The heat radiating member is connected to the second surface. A wavelength conversion device characterized by the above. According to such a configuration, the vapor chamber has high heat diffusivity. Therefore, it is possible to easily transfer the heat of the phosphor heated by the heat receiving portion disposed on the first surface to the heat radiating member connected to the second surface on the side opposite to the first surface. Accordingly, the heat of the phosphor can be efficiently transferred to the heat radiating member, and the cooling efficiency of the phosphor can be enhanced.

[0097] [Appendix 7] In the wavelength conversion device according to Appendix 1, the cooling device includes a Peltier element having a flat first surface that is the heat receiving portion and a second surface on the side opposite to the first surface, and a heat radiating member connected to the second surface. A wavelength conversion device characterized by the above. According to such a configuration, by applying a voltage to the Peltier element, the heat of the phosphor heated at the heat receiving portion which is the first surface can be efficiently transferred to the heat radiating member fixed to the second surface on the side opposite to the first surface. Accordingly, the cooling efficiency of the phosphor can be enhanced.

[0098] [Appendix 8] In the wavelength conversion device according to Appendix 1, the cooling device includes a cold plate having a flat first surface on which the heat receiving portion is disposed and through which a cooling medium flows inside. A wavelength conversion device characterized by the above. According to such a configuration, by the cold plate, the heat of the phosphor heated at the heat receiving portion can be radiated to the cooling medium flowing inside the cold plate. Accordingly, the cooling efficiency of the phosphor can be enhanced.

[0099] [Appendix 9] In the wavelength conversion device according to Appendix 8, the cold plate includes a heat radiating member fixed to a surface different from the first surface. A wavelength conversion device characterized by the above. According to such a configuration, the heat transferred to the cold plate can be dissipated to the surroundings of the cold plate by the heat dissipation member. Therefore, the heat of the phosphor can be dissipated not only to the cooling medium but also to the gas around the cold plate by the cold plate. Therefore, the cooling efficiency of the phosphor can be increased.

[0100] [Appendix 10] In the wavelength conversion device described in Appendix 1, the cooling device includes a heat dissipation member that dissipates the transferred heat, the heat dissipation member has a base portion having a planar first surface on which the heat receiving portion is disposed and a second surface opposite to the first surface, and heat dissipation fins provided on the second surface. A wavelength conversion device characterized by the above. According to such a configuration, the heat of the phosphor is received at the first surface which is the heat receiving portion, and is dissipated by the heat dissipation fins provided on the second surface opposite to the first surface. According to this, the heat of the phosphor can be efficiently transferred to the heat dissipation fins, so that the cooling efficiency of the phosphor can be increased.

[0101] [Appendix 11] In the wavelength conversion device according to any one of Appendix 2 to Appendix 7, Appendix 9, and Appendix 10, a duct in which the heat dissipation member is disposed inside and through which a cooling gas can flow, and a fan for flowing the cooling gas in the duct. A wavelength conversion device characterized by the above. According to such a configuration, since the heat dissipation member is disposed in the duct through which the cooling gas flows inside by the fan, the heat dissipation member to which the heat of the phosphor is transferred can be effectively cooled, and thus the cooling efficiency of the phosphor can be increased.

[0102] [Appendix 12] In the wavelength conversion device according to any one of Appendix 1 to Appendix 11, the phosphor is fixed to the heat receiving portion by either metal bonding with solder or firing and fixing of the metal. A wavelength conversion device characterized by the following. According to such a configuration, the thermal resistance between the phosphor and the heat-receiving part can be reduced, so that heat can be well transferred from the phosphor to the heat-receiving part. Therefore, the cooling efficiency of the phosphor can be increased.

[0103] [Appendix 13] The wavelength conversion device according to any one of Appendices 1 to 12, and a light source that emits light incident on the phosphor, characterized by the following. A light source device. According to such a configuration, the same effects as those of the above-described wavelength conversion device can be achieved. Therefore, the amount of light incident on the wavelength conversion device can be increased, and a light source device capable of emitting high-brightness light can be configured.

[0104] [Appendix 14] The light source device according to Appendix 13, an optical modulation element that modulates the light from the light source device, and a projection optical device that projects the light modulated by the optical modulation element, characterized by the following. A projector. According to such a configuration, the same effects as those of the above-described light source device can be achieved, so that a projector capable of projecting high-brightness image light can be configured.

Explanation of Reference Numerals

[0105] 1... Projector, 343B, 343G, 343R... Optical modulation element, 36... Projection optical device, 4... Light source device, 41... Light source, 5A, 5B, 5C, 5D, 5E... Wavelength conversion device, 51... Phosphor, 52A, 52B, 52C, 52D, 52E... Cooling device, 53, 63, 73... Heat transfer member, 531, 6311, 731, 811... Heat receiving part, 53A... First surface, 53B... Second surface, 53C... Third surface, 53D... Fourth surface, 73A... First surface, 73B... Second surface, 54, 64... Support member, 541... Groove, 54A... First surface, 54B... Second surface, 55, 65... Heat radiating member, 551... Base, 551A... First surface, 551B... Second surface, 552... Fin, 56, 66... Duct, 562... Opening, 563... Outlet, 57... Fan, 58... Heat radiating member, 581... Base, 5811... Heat receiving part, 581A... First surface, 581B... Second surface, 582... Heat radiating fin, 81... Cold plate, 81A... First surface.

Claims

1. A phosphor that is a heat source and emits light in a specific wavelength band, A cooling device having a planar heat receiving portion on which the phosphor is disposed, and radiating heat of the phosphor heated by the heat receiving portion, A wavelength conversion device characterized by the above.

2. In the wavelength conversion device according to Claim 1, The cooling device, A heat radiating member that radiates the transmitted heat, A heat transport member that evaporates a liquid-phase working fluid by the heat received at the heat receiving portion to change the liquid-phase working fluid into a gas-phase working fluid, and radiates the heat of the gas-phase working fluid to the heat radiating member to change the gas-phase working fluid into a liquid-phase working fluid, The heat receiving portion is provided on the heat transport member, A wavelength conversion device characterized by the above.

3. In the wavelength conversion device according to Claim 2, Further comprising a support member having a groove in which the heat transport member is disposed, The heat transport member is a heat pipe, A wavelength conversion device characterized by the above.

4. In the wavelength conversion device according to Claim 3, The support member receives heat from the heat transport member, The heat radiating member is connected to the support member, A wavelength conversion device characterized by the above.

5. In the wavelength conversion device according to Claim 3, The heat radiating member is provided at each of both ends of the heat pipe, A wavelength conversion device characterized by the above.

6. In the wavelength conversion device according to Claim 2, The heat transport member is a vapor chamber, The vapor chamber, A planar first surface on which the heat receiving portion is disposed, A second surface opposite to the first surface, The heat radiating member is connected to the second surface, A wavelength conversion device characterized by the above.

7. In the wavelength conversion device according to Claim 1, The cooling device, A Peltier element having a flat first surface that is the heat receiving portion and a second surface opposite to the first surface, A heat radiating member connected to the second surface, A wavelength conversion device characterized by the above.

8. In the wavelength conversion device according to Claim 1, The cooling device has a planar first surface on which the heat receiving portion is disposed, and includes a cold plate through which a cooling medium flows inside, A wavelength conversion device characterized by the above.

9. In the wavelength conversion device according to Claim 8, The cold plate includes a heat radiating member fixed to a surface different from the first surface, A wavelength conversion device characterized by the above.

10. In the wavelength conversion device according to claim 1, the cooling device includes a heat radiating member that radiates the transferred heat, the heat radiating member includes a base having a planar first surface on which the heat receiving portion is disposed and a second surface opposite to the first surface, and heat radiating fins provided on the second surface, and is characterized by the wavelength conversion device.

11. In the wavelength conversion device according to any one of claims 2 to 7, claim 9, and claim 10, a duct in which the heat radiating member is disposed and through which a cooling gas can flow inside, and a fan that circulates the cooling gas in the duct, and is characterized by the wavelength conversion device.

12. In the wavelength conversion device according to any one of claims 1 to 10, the phosphor is fixed to the heat receiving portion by either metal bonding with solder or baking and fixing of the metal, and is characterized by the wavelength conversion device.

13. A wavelength conversion device according to any one of claims 1 to 10, and a light source that emits light incident on the phosphor, and is characterized by the light source device.

14. A light source device according to claim 13, an optical modulation element that modulates the light from the light source device, and a projection optical device that projects the light modulated by the optical modulation element, and is characterized by the projector.

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