Light source device and projector

Abstract

A light source device and a projector capable of improving cooling efficiency. The light source device has: a light source module; a plurality of heat receiving plates connected to the light source module; a cooling plate connected to the plurality of heat receiving plates, through which a coolant flows inside, the cooling plate having: an inflow portion; an outflow portion; an upstream side flow passage through which the coolant flowing from the inflow portion flows in the second direction perpendicular to the first direction; a downstream side flow passage through which the coolant flowing after the upstream side flow passage flows in the opposite direction of the second direction; a plurality of heat transfer portions provided to at least one of the upstream side flow passage and the downstream side flow passage, arranged in the second direction, the plurality of heat transfer portions having: a plurality of fins extending in the second direction and arranged in the first direction; and a plurality of flow paths provided between the plurality of fins, the plurality of heat receiving plates being arranged in the second direction, the plurality of heat transfer portions being separated from each other in the second direction between the plurality of heat receiving plates.

Description

Technical Field

[0001] This disclosure relates to light source devices, projectors, and cooling plates. Background Technology

[0002] Previously, projectors with a light source device were known, which had multiple solid-state light sources (see, for example, Patent Document 1).

[0003] In the projector described in Patent Document 1, the light source device includes a first light source and a second light source, each having a light source array and a light source cooling section for cooling the light source array. The light source array has multiple light source modules arranged along the short side of a single light source module. Each of the multiple light source modules has multiple solid-state light sources arranged horizontally and vertically, and a support section that supports the multiple solid-state light sources and fixes them to the light source cooling section.

[0004] The light source cooling unit has a first component that fixes the light source array and a second component disposed on the opposite side of the light source array relative to the first component. The light source cooling unit is constructed by combining the first component and the second component.

[0005] The first component has multiple mounting portions for mounting multiple light source modules. Additionally, the first component has a first fin and a second fin on the side opposite to the side where the multiple mounting portions are located. When the first and second components are combined, the first and second fins form part of a flow path for the flow of liquid refrigerant.

[0006] Liquid refrigerant flows between the multiple fin elements forming the first fin and between the multiple fin elements forming the second fin. Specifically, the liquid refrigerant flowing into the interior of the light source cooling section via the inlet is divided into liquid refrigerant flowing on the first fin side and liquid refrigerant flowing on the second fin side. The liquid refrigerant flowing on the first fin side flows between the multiple fin elements of the first fin while reversing its flow direction multiple times. Similarly, the liquid refrigerant flowing on the second fin side flows between the multiple fin elements of the second fin while reversing its flow direction multiple times. The liquid refrigerant flowing on the first fin side and the liquid refrigerant flowing on the second fin side are discharged to the outside of the light source cooling section via the outlet. That is, the light source cooling section has a meandering flow path for the liquid refrigerant to flow from the inlet to the outlet.

[0007] Patent Document 1: Japanese Patent Application Publication No. 2020-79950

[0008] However, in the light source device described in Patent Document 1, the fin elements are relatively long in the extension direction, resulting in a large pressure loss of the coolant. Furthermore, in the light source cooling section that diverts the liquid refrigerant flowing from the inlet to the first and second fins, the pressure loss increases before the liquid refrigerant reaches the multiple fin elements of the first fin and the multiple fin elements of the second fin.

[0009] To address this issue, a large pump is considered as the pump supplying liquid refrigerant to the light source cooling unit. However, this would lead to problems such as an increased size of the cooling device, and consequently, a larger projector.

[0010] Therefore, other structures that can efficiently cool the object being cooled are desired. Summary of the Invention

[0011] The light source device of the first aspect of this disclosure includes: a light source module having multiple substrates on which light-emitting elements are disposed; multiple heating plates connected to the light source module; and a cooling plate connected to the multiple heating plates respectively, wherein a coolant flows through the cooling plate, the cooling plate having: an inlet portion disposed at a portion along a first direction at an end for the coolant to flow into; an outlet portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inlet portion flows along a second direction perpendicular to the first direction; and a downstream flow portion in which the coolant flowing through the upstream flow portion flows. Coolant flows in the downstream flow section in the opposite direction to the second direction; and a plurality of heat transfer sections are disposed in at least one of the upstream and downstream flow sections and arranged in the second direction. The plurality of heat transfer sections have: a plurality of fins that extend in the second direction and are arranged in the first direction; and a plurality of flow paths disposed between the plurality of fins, in which the coolant can flow. The plurality of heating plates are disposed in the second direction corresponding to the at least one flow section. The plurality of heat transfer sections are separated from each other at positions in the second direction corresponding to the positions between the plurality of heating plates.

[0012] The light source device of the second aspect of this disclosure includes: a light source module having a plurality of substrates on which light-emitting elements are disposed; a heating plate connected to the light source module; and a cooling plate connected to the heating plate, wherein a coolant flows through the cooling plate, the cooling plate having: an inlet portion disposed at a portion along a first direction at an end for the coolant to flow into; an outlet portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inlet portion flows along a second direction perpendicular to the first direction; and a downstream flow portion in which the coolant flowing after passing through the upstream flow portion flows along... The opposite direction of the second direction flows in the downstream flow section; and a plurality of heat transfer sections are disposed in at least one of the upstream and downstream flow sections, arranged in the second direction, the plurality of heat transfer sections having: a plurality of fins extending along the second direction and arranged along the first direction; and a plurality of flow paths disposed between the plurality of fins, in which coolant can flow, the plurality of substrates arranged in the second direction, and the plurality of heat transfer sections being separated from each other at positions corresponding to the positions between two light-emitting elements arranged along the second direction.

[0013] The light source device of the third aspect of this disclosure includes: a light source module having a plurality of substrates on which light-emitting elements are disposed; a plurality of heating plates connected to the light source module; and a cooling plate connected to the plurality of heating plates respectively, wherein a coolant flows through the cooling plate, the cooling plate having: an inflow portion disposed at a portion along a first direction at an end for the coolant to flow into; an outflow portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inflow portion flows along a second direction perpendicular to the first direction; and a downstream flow portion in which the coolant flowing after flowing through the upstream flow portion flows along the opposite direction of the second direction; and a plurality of heat transfer portions disposed in at least one of the upstream flow portion and the downstream flow portion. The plurality of heat transfer portions, arranged along the second direction, include: a plurality of fins extending along the second direction and arranged along the first direction; and a plurality of flow paths disposed between the plurality of fins, through which coolant can flow. A plurality of substrates are arranged in the second direction. The plurality of heating plates include: an upstream heating plate corresponding to the upstream flow portion; and a downstream heating plate corresponding to the downstream flow portion. The plurality of substrates include: a plurality of upstream substrates arranged in the second direction and connected to the upstream heating plate; and a plurality of downstream substrates arranged in the second direction and connected to the downstream heating plate. The plurality of heat transfer portions are separated from each other at positions corresponding to the positions between two light-emitting elements arranged along the second direction.

[0014] The projector of the fourth aspect of this disclosure includes: a light source device of any one of the first to third aspects described above; an image forming apparatus that modulates light emitted from the light source device to form image light; and a projection optical apparatus that projects the image light formed by the image forming apparatus.

[0015] The cooling plate of the fifth aspect of this disclosure is a cooling plate in which coolant can flow internally, comprising: an inlet portion disposed at a portion along a first direction at an end for the coolant to flow into; an outlet portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inlet portion flows along a second direction perpendicular to the first direction; a downstream flow portion in which the coolant flowing after flowing in the upstream flow portion flows along the opposite direction of the second direction; and a plurality of heat transfer portions disposed at at least one of the upstream and downstream flow portions, arranged in the second direction, the plurality of heat transfer portions comprising: a plurality of fins extending along the second direction and arranged along the first direction; and a plurality of flow paths disposed between the plurality of fins, in which the coolant can flow, the plurality of heat transfer portions being separated from each other in the second direction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the structure of the projector according to the first embodiment.

[0017] Figure 2 This is a schematic diagram showing the structure of the light source device according to the first embodiment.

[0018] Figure 3 This is a schematic diagram showing the structure of the light source unit in the first embodiment.

[0019] Figure 4 This is a top view showing the first light source unit of the first embodiment.

[0020] Figure 5 This is an exploded perspective view showing the first cooling plate of the first embodiment.

[0021] Figure 6 This is an exploded perspective view showing the first cooling plate of the first embodiment.

[0022] Figure 7 This is a cross-sectional view showing the first cooling plate of the first embodiment.

[0023] Figure 8 This is a schematic diagram showing the positional relationship between the first heating plate and the heat transfer section in the first embodiment.

[0024] Figure 9 This is a perspective view showing the connection state between the first cooling plate and the second cooling plate in the first embodiment.

[0025] Figure 10 This is a schematic diagram showing a modification of the first light source unit in the first embodiment.

[0026] Figure 11 This is a schematic diagram showing the first light source unit of the light source device included in the projector of the second embodiment.

[0027] Figure 12 This is a schematic diagram showing a modification of the first light source unit in the second embodiment.

[0028] Figure 13 This is a schematic diagram showing the first light source unit of the light source device included in the projector of the third embodiment.

[0029] Figure 14 This is a schematic diagram showing the first light source unit of the light source device included in the projector of the fourth embodiment.

[0030] Label Explanation

[0031] 1: Projector; 34: Image forming apparatus; 36: Projection optics; 4: Light source apparatus; 6: Light source unit; 61, 61A, 64, 64A, 65, 66: First light source unit; 611, 611A, 641, 661: First light source module (light source module); 612, 642, 662: Substrate; 612A, 662A: Upstream substrate; 612B, 662B: Downstream substrate; 613: Light-emitting element; 614, 644, 644A, 654, 664: First heating plate (heated plate); 614A, 664A: Upstream heating plate; 614B, 664B: Downstream heating plate; 615, 655: First cooling plate 615A, 655A: End; 616: First plate element; 616A: First surface; 617: Heat transfer section; 6171: Fin; 6172: Flow path; 617A: Upstream heat transfer section; 617B: Downstream heat transfer section; 618: Second plate element; 618B: End; 6181: Inflow section; 6182: Outflow section; 6183: Recess; 6184: Partition wall; 6185: Upstream flow section; 6186: Downstream flow section; 6187: Connecting section; 62: Second light source section; 621: Second light source module (light source module); 624: Second heating plate; 625: Second cooling plate; GP1, GP2: Gap. Detailed Implementation

[0032] [First Implementation]

[0033] Hereinafter, the first embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0034] [General Structure of a Projector]

[0035] Figure 1 This is a schematic diagram showing the structure of the projector 1 in this embodiment.

[0036] In this embodiment, the projector 1 modulates the light emitted from the light source device 4 to form an image corresponding to image information, and then magnifies and projects the formed image onto a projection surface such as a screen. Figure 1 As shown, the projector 1 has an outer casing 2 and an image projection device 3. Furthermore, although not shown in the figures, the projector 1 includes: a power supply device that supplies power to the electronic components constituting the projector 1; a control device that controls the operation of the projector 1; and a cooling device that cools the components constituting the projector 1.

[0037] Additionally, the cooling device includes a first cooling plate 615 and a second cooling plate 625, which will be described later (see reference). Figure 3 The cooling device has a circulation path for the coolant circulating in the system. Specifically, the cooling device includes a tank for storing coolant, a radiator for cooling the coolant, a pump for pumping the coolant, and multiple pipes. The multiple pipes connect the tank, radiator, pump, first cooling plate 615, and second cooling plate 625 in a manner that allows coolant to flow.

[0038] [Structure of the outer casing]

[0039] The outer casing 2 constitutes the outer casing of the projector 1, and internally houses the image projection device 3, power supply device, control device, and cooling device.

[0040] The outer casing 2 has a front portion 21, a back portion 22, a left side portion 23, and a right side portion 24. Although not shown in the figure, the outer casing 2 has a top portion connecting one end of each of the portions 21 to 24 and a bottom portion connecting the other end of each of the portions 21 to 24. The outer casing 2 is formed, for example, in a generally cuboid shape.

[0041] The right side panel 24 has an inlet 241. The inlet 241 introduces air from outside the outer housing 2 into the interior of the outer housing 2. A filter may also be provided at the inlet 241 to capture dust contained in the air passing through the inlet 241.

[0042] The front portion 21 has a passage 211 located approximately in the center of the front portion 21. Light projected from the projection optical device 36, described later, passes through the passage 211.

[0043] The front part 21 has an exhaust port 212 located on the left side of the front part 21, on the side of the left face 23.

[0044] The exhaust port 212 discharges the air that has cooled the object housed inside the outer casing 2 to the outside of the outer casing 2.

[0045] In the following description, the three mutually perpendicular directions are designated as the +X direction, +Y direction, and +Z direction. The +X direction is from the left face 23 towards the right face 24. The +X direction is the direction in which illumination light is emitted from the light source device 4 to the homogenizing device 31, as described later. The +Y direction is from the bottom face towards the top face. The +Z direction is from the back face 22 towards the front face 21. When viewed from the +Y direction, the +Z direction is the direction in which image light is projected by the projection optics device 36, as described later. Although the illustration is omitted, the opposite direction of the +X direction is designated as the -X direction, the opposite direction of the +Y direction as the -Y direction, and the opposite direction of the +Z direction as the -Z direction.

[0046] [Structure of the image projection device]

[0047] The image projection device 3 forms an image corresponding to the image information input from the control device and projects the formed image. The image projection device 3 includes a light source device 4, a homogenization device 31, a color separation device 32, a relay device 33, an image forming device 34, an optical component housing 35, and a projection optical device 36.

[0048] Furthermore, the structure of the light source device 4 will be described in detail later.

[0049] The homogenization device 31 homogenizes the light emitted from the light source device 4. The homogenized light passes through the color separation device 32 and the relay device 33 to illuminate the modulation area of ​​the light modulation device 343, which will be described later. The homogenization device 31 has two lens arrays 311 and 312, a polarization conversion element 313, and an overlapping lens 314.

[0050] The color separation device 32 separates the light incident from the homogenizing device 31 into red, green, and blue light. The color separation device 32 has two dichroic mirrors 321 and 322 and a reflector 323 that reflects the blue light separated by the dichroic mirror 321.

[0051] The relay device 33 is positioned in the optical path of red light, which has a longer optical path than other colors of light, to suppress the loss of red light. The relay device 33 includes an incident-side lens 331, a relay lens 333, and reflectors 332 and 334. Furthermore, in this embodiment, it is assumed that the relay device 33 is positioned in the optical path of red light. However, it is not limited to this; for example, it could be configured such that the color with a longer optical path than other colors of light is blue light, and the relay device 33 is positioned in the optical path of blue light.

[0052] The image forming apparatus 34 modulates incident red, green, and blue light, and combines the modulated light to form image light. That is, the image forming apparatus 34 modulates light emitted from the light source device 4 to form image light. The image forming apparatus 34 includes three field lenses 341, three incident-side polarizers 342, three light modulation devices 343, three field-view compensation plates 344, three exit-side polarizers 345, and one color combining unit 346, all configured according to the incident light colors.

[0053] The light modulation device 343 modulates the light emitted from the light source device 4 according to image information. The three light modulation devices 343 include a light modulation device 343R for modulating red light, a light modulation device 343G for modulating green light, and a light modulation device 343B for modulating blue light. Each light modulation device 343 is composed of a transmissive liquid crystal panel, and a liquid crystal light valve is formed by an incident-side polarizer 342, the light modulation device 343, and an exit-side polarizer 345.

[0054] The color combining unit 346 combines the three colors of light modulated by the light modulation devices 343B, 343G, and 343R to form image light, and then emits the formed image light toward the projection optical device 36. In this embodiment, the color combining unit 346 is composed of a cross-shaped dichroic prism, but it is not limited to this; for example, it may also be composed of multiple dichroic mirrors.

[0055] The optical component housing 35 houses the aforementioned devices 31 to 34. Furthermore, the image projection device 3 has an illumination optical axis Ax, which serves as the design optical axis, and the optical component housing 35 holds each device 31 to 34 at a predetermined position on the illumination optical axis Ax. The light source device 4 and the projection optical device 36 are positioned at predetermined positions on the illumination optical axis Ax.

[0056] The projection optical device 36 is a projection lens that magnifies and projects the image light incident from the image forming apparatus 34 onto the projection surface. That is, the projection optical device 36 projects the image light formed by the image forming apparatus 34. As the projection optical device 36, a lens group having multiple lenses and a cylindrical lens barrel that houses the multiple lenses can be exemplified.

[0057] [Structure of the light source device]

[0058] Figure 2 This is a schematic diagram showing the light source device 4.

[0059] The light source device 4 emits illumination light to the homogenizing device 31 to illuminate the image forming device 34. For example... Figure 2As shown, the light source device 4 includes a light source housing CA, a focal-free optical element 41, a first phase difference element 42, a diffusion transmission element 43, a light separation and synthesis element 44, a second phase difference element 45, a first focusing element 46, a diffusion optical element 47, a second focusing element 48, a wavelength conversion element 49, a third phase difference element 50, and a light source section 6.

[0060] The light source device 4 includes: an illumination optical axis Ax1, which extends in a straight line along the -Z direction; and an illumination optical axis Ax2, which is perpendicular to the illumination optical axis Ax1 and extends in a straight line along the +X direction.

[0061] The light source unit 6, the afocal optical element 41, the first phase difference element 42, the diffusion transmission element 43, the light separation and synthesis element 44, the second phase difference element 45, the first focusing element 46, and the diffusion optical element 47 are arranged on the illumination optical axis Ax1.

[0062] Wavelength conversion element 49, second focusing element 48, light separation and synthesis element 44 and third phase difference element 50 are arranged on illumination optical axis Ax2.

[0063] [Structure of the housing for the light source]

[0064] The housing CA for the light source is a sealed housing that houses the afocal optical element 41, the first phase difference element 42, the diffusion transmission element 43, the light separation and synthesis element 44, the second phase difference element 45, the first focusing element 46, the diffusion optical element 47, the second focusing element 48, the wavelength conversion element 49, the third phase difference element 50, and the light source section 6, and is difficult for dust and other particles to penetrate into.

[0065] [Structure of the light source section]

[0066] Figure 3 This is a schematic diagram showing the structure of the light source unit 6. Specifically, Figure 3 This is a schematic diagram showing a cross-section of the light source section 6 as viewed from the -X direction.

[0067] The light source unit 6 emits the light incident on the diffusion optical element 47 and the wavelength conversion element 49 (described later) in the -Z direction. For example... Figure 3 As shown, the light source unit 6 includes a first light source unit 61, a second light source unit 62, and a light synthesis component 63.

[0068] The first light source unit 61 is disposed in the light source unit 6 in the +Z direction. The first light source unit 61 has a first light source module 611, a first heat receiving plate 614, and a first cooling plate 615, and emits light as blue light in the -Z direction. The first cooling plate 615 transfers the heat transferred from the first light source module 611 via the first heat receiving plate 614 to the coolant flowing inside, thereby cooling the first light source module 611.

[0069] The second light source unit 62 is disposed in the light source unit 6 in the -Y direction. The second light source unit 62 includes a second light source module 621, a plurality of second heat receiving plates 624, and a second cooling plate 625, and emits light as blue light in the +Y direction. The second cooling plate 625 transfers the heat transferred from the second light source module 621 via the plurality of second heat receiving plates 624 to the coolant flowing inside, thereby cooling the second light source module 621.

[0070] Furthermore, the detailed structure of the first light source unit 61 and the second light source unit 62 will be described in detail later.

[0071] A light combining component 63 is disposed at the intersection of the light path of the light emitted from the first light source unit 61 and the light path of the light emitted from the second light source unit 62. The light combining component 63 combines the light emitted from the first light source unit 61 in the -Z direction and the light emitted from the second light source unit 62 in the +Y direction, and emits the combined light in the -Z direction. A stripe mirror can be exemplified as the light combining component 63.

[0072] The light emitted by such a light source unit 6 is, for example, a laser with a peak wavelength of 440 nm. More specifically, the light emitted by the light source unit 6 is relatively... Figure 2 The light-splitting and combining element 44 shown emits s-polarized blue light BLs. Alternatively, the light source unit 6 can emit p-polarized blue light BLp relative to the light-splitting and combining element 44, or it can emit blue light containing a mixture of s-polarized and p-polarized light. In the latter case, the first phase difference element 42 can be omitted.

[0073] [Structure of afocal optical element]

[0074] The afocal optical element 41 adjusts the beam diameter of the blue light BLs incident from the light source unit 6 in the -Z direction. The afocal optical element 41 is composed of a lens 411 that converges the incident light and a lens 412 that parallelizes the beam converged by the lens 411. Alternatively, the afocal optical element 41 may be omitted.

[0075] [Structure of the first phase difference element]

[0076] A first phase-difference element 42 is disposed between lenses 411 and 412. The first phase-difference element 42 converts a portion of the incident blue light BLs, emitting light containing s-polarized blue light BLs and p-polarized blue light BLp. The first phase-difference element 42 can also be rotated about the rotation axis along the illumination optical axis Ax1 by a rotating device. In this case, the ratio of the s-polarized component to the p-polarized component in the blue light emitted from the first phase-difference element 42 can be adjusted according to the rotation angle of the first phase-difference element 42.

[0077] [Structure of a diffusion transmission element]

[0078] The diffusion transmission element 43 homogenizes the illuminance distribution of blue light BLp and BLs incident from lens 412 in the -Z direction. The diffusion transmission element 43 can be exemplified by a structure with a holographic element, a structure with multiple small lenses arranged on a plane perpendicular to the optical axis, and a structure with a rough surface through which light passes.

[0079] Alternatively, a beam equalizer optical element with a pair of multiple lenses can be used instead of the diffuser transmission element 43.

[0080] [Structure of the optical separation and synthesis element]

[0081] Blue light BLs and BLp passing through diffusion transmission element 43 is incident on light separation and synthesis element 44.

[0082] The light-splitting and combining element 44 functions as both a light-splitting element that separates incident light and a light-combining element that combines light incident from two directions. In other words, the light-splitting and combining element 44 functions as both a light-splitting element and a light-combining element.

[0083] The light-splitting and combining element 44 is a polarization beam splitter that separates the s-polarized and p-polarized components contained in the incident light. Specifically, the light-splitting and combining element 44 reflects the s-polarized component and allows the p-polarized component to pass through. In addition, the light-splitting and combining element 44 has color-splitting characteristics that allow light of a specified wavelength or higher to pass through regardless of whether it is the s-polarized or p-polarized component. Therefore, the p-polarized blue light BLp of the blue light BLp and BLs incident from the diffusion transmission element 43 to the light-splitting and combining element 44 passes through the light-splitting and combining element 44 in the -Z direction and is incident on the second phase difference element 45. On the other hand, the s-polarized blue light BLs is reflected by the light-splitting and combining element 44 in the -X direction and is incident on the second focusing element 48.

[0084] Alternatively, the light-splitting and synthesizing element 44 may also function as a semi-transparent mirror that allows a portion of the light incident from the light source 6 via the diffusion and transmission element 43 to pass through and reflects the remaining light, and as a dichroic mirror that reflects blue light incident from the diffusion optical element 47 and allows fluorescence incident from the wavelength conversion element 49 with a wavelength longer than that of blue light to pass through. In this case, the first phase difference element 42 can be omitted.

[0085] [Structure of the second phase difference element]

[0086] The second phase difference element 45 is disposed in the -Z direction relative to the light splitter and combiner element 44. That is, the second phase difference element 45 is disposed between the light splitter and combiner element 44 and the first focusing element 46. The second phase difference element 45 converts the blue light BLp that has passed through the light splitter and combiner element 44 into circularly polarized blue light BLc. The blue light BLc that has passed through the second phase difference element 45 in the -Z direction is incident on the first focusing element 46.

[0087] [Structure of the first focusing element]

[0088] The first focusing element 46 converges the blue light BLc incident from the second phase difference element 45 in the -Z direction through the light separation and combining element 44 to the diffusion optical element 47. In addition, the first focusing element 46 parallelizes the light incident from the diffusion optical element 47 in the +Z direction and emits it towards the second phase difference element 45.

[0089] In this embodiment, the first focusing element 46 is composed of three lenses 461, 462, and 463, but there is no limitation on the number of lenses constituting the first focusing element 46.

[0090] [Structure of a diffusion optical element]

[0091] The diffusion optical element 47 diffuses the incident blue light BLc at the same diffusion angle as the fluorescence YL emitted from the wavelength conversion element 49. Specifically, the diffusion optical element 47 diffuses the blue light BLc incident from the first focusing element 46 in the -Z direction by reflecting it in the +Z direction. The diffusion optical element 47 is a reflective element that causes the incident blue light BLc to undergo Lambertian reflection. Alternatively, the diffusion optical element 47 can also be rotated by a rotating device around a rotation axis parallel to the illumination optical axis Ax1.

[0092] The blue light Blc, diffused by the diffuser optics 47, is incident on the second phase-difference element 45 after passing through the first focusing element 46. Upon reflection by the diffuser optics 47, the blue light Blc is converted into circularly polarized light with the opposite rotation direction. Therefore, the blue light Blc incident on the second phase-difference element 45 via the first focusing element 46 is converted into s-polarized blue light BLs by the second phase-difference element 45. Then, the blue light BLs is reflected in the +X direction by the light-splitting and combining element 44 and incident on the third phase-difference element 50.

[0093] [Structure of the second focusing element]

[0094] The second focusing element 48 focuses the blue light BLs reflected by the light splitting and combining element 44 in the -X direction onto the wavelength conversion element 49. In addition, the second focusing element 48 parallelizes the fluorescent YL incident from the wavelength conversion element 49 in the +X direction, and emits the parallelized fluorescent YL toward the light splitting and combining element 44.

[0095] In this embodiment, the second focusing element 48 is composed of three lenses 481, 482, and 483, but there is no limitation on the number of lenses constituting the second focusing element 48.

[0096] [Simplified structure of wavelength conversion element]

[0097] Wavelength conversion element 49 converts the wavelength of blue light BLs incident from the second focusing element 48.

[0098] That is, the wavelength conversion element 49 converts the blue light BLs incident from the second focusing element 48 into fluorescent light YL with a wavelength longer than that of the blue light BLs and emits it. The wavelength conversion element 49 is a reflective wavelength conversion element that emits fluorescent light YL towards the incident side of the blue light BLs. The blue light BLs incident on the wavelength conversion element 49 is equivalent to the excitation light or the light of the first band, and the fluorescent light YL is equivalent to the converted light or the light of the second band.

[0099] The wavelength conversion element 49 has a phosphor wheel 491 and a rotating device 495 for rotating the phosphor wheel 491. The phosphor wheel 491 has a wavelength conversion layer 492, a reflective layer 493, and a support substrate 494.

[0100] The wavelength conversion layer 492 contains a phosphor and is arranged in a ring shape with the rotation axis of the phosphor wheel 491 as the center. The reflective layer 493 is disposed on the side opposite to the incident side of the excitation light relative to the wavelength conversion layer 492, and reflects the light incident from the wavelength conversion layer 492. The support substrate 494 supports the wavelength conversion layer 492 and the reflective layer 493.

[0101] Alternatively, the wavelength conversion element 49 can also be a structure that is not rotated by the rotating device.

[0102] The fluorescent YL emitted from the wavelength conversion element 49 in the +X direction is parallelized by the second focusing element 48 and then incident on the light-splitting and combining element 44. As described above, the light-splitting and combining element 44 has the characteristic of allowing the fluorescent YL to pass through. Therefore, the fluorescent YL incident on the light-splitting and combining element 44 along the +X direction passes through the light-splitting and combining element 44 and is incident on the third phase-difference element 50. That is, the light incident from the light-splitting and combining element 44 onto the third phase-difference element 50 is white light containing a mixture of blue light BLs and fluorescent YL.

[0103] [Structure of the third phase difference element]

[0104] The third phase difference element 50 converts the white light containing blue light BLs and fluorescent YL incident from the light separation and synthesis element 44 into a mixture of s-polarized and p-polarized white light. The converted white light is then emitted as illumination light LT in the +X direction and incident on the homogenization device 31 described above.

[0105] [Structure of the first light source section]

[0106] Figure 4 This is a schematic top view of the first light source unit 61 as seen from the -Z direction. That is, Figure 4 This is a schematic diagram showing the first light source unit 61 as seen from the side from which the light is emitted.

[0107] like Figure 4 As shown, the first light source unit 61 includes a first light source module 611, a first heating plate 614, and a first cooling plate 615.

[0108] [Structure of the first light source module]

[0109] The first light source module 611 emits blue light. The first light source module 611 has a plurality of substrates 612 arranged in a plane perpendicular to the optical axis of the emitted blue light. The first light source module 611 has a plurality of substrates 612 arranged in the +X direction and the +Y direction.

[0110] Multiple substrates 612 are each formed into a cuboid shape that is longer in the +Y direction. Each substrate 612 holds at least one light-emitting element 613. That is, the substrate 612 is a support component that supports the light-emitting element 613. The substrate 612 is made of a metal with high thermal conductivity, which transfers the heat generated by the light-emitting element 613 to the first heating plate 614.

[0111] In this embodiment, each of the plurality of substrates 612 has two light-emitting elements 613 arranged in the +Y direction. The +Y direction corresponds to the first direction. However, the number of light-emitting elements 613 in the substrate 612 can be appropriately varied. Specifically, the number of light-emitting elements 613 in the substrate 612 can be one or more.

[0112] The light-emitting element 613 is a semiconductor laser that emits blue light BLs. However, the light-emitting element 613 can also be configured to emit p-polarized blue light BLp from the light-splitting and combining element 44. As described above, the blue light emitted by the light-emitting element 613 is, for example, a laser with a peak wavelength of 440 nm. The blue light emitted from the plurality of light-emitting elements 613 is parallelized by a collimating lens (not shown) before being emitted.

[0113] Here, the plurality of substrates 612 include: six upstream substrates 612A disposed in the +Y direction and arranged in the +X direction; and six downstream substrates 612B disposed in the -Y direction and arranged in the +X direction. That is, the first light source module 611 has 12 substrates 612.

[0114] The six upstream-side substrates 612A are substrates 612 arranged corresponding to the upstream-side flow section 6185 provided in the first cooling plate 615 described later. The upstream-side substrates 612A are mounted on the upstream-side heating plates 614A described later in a plurality of first heating plates 614.

[0115] The six downstream substrates 612B are substrates 612 configured corresponding to the downstream flow section 6186 provided in the first cooling plate 615. The downstream substrates 612B are mounted on the downstream heat receiving plates 614B described later in a plurality of first heat receiving plates 614.

[0116] [Structure of the first heating plate]

[0117] Multiple first heating plates 614 are disposed between the first light source module 611 and the first cooling plate 615. The multiple first heating plates 614 support multiple substrates 612 and receive heat from the light-emitting elements 613 transferred from the substrates 612, transferring it to the first cooling plate 615. Viewed from the light emission side of the first light source module 611, i.e., the -Z direction, the multiple first heating plates 614 are each formed as approximately rectangular shapes larger than the substrates 612.

[0118] In this embodiment, the plurality of first heating plates 614 include three upstream heating plates 614A arranged in the +Y direction and arranged in the +X direction, and three downstream heating plates 614B arranged in the -Y direction and arranged in the +X direction.

[0119] The three upstream heating plates 614A are first heating plates 614 arranged corresponding to the upstream flow section 6185 within the first cooling plate 615. Each of the three upstream heating plates 614A supports two of the six upstream substrates 612A. That is, the three upstream heating plates 614A are arranged along the +X direction while supporting two upstream substrates 612A respectively.

[0120] The three downstream heating plates 614B are the first heating plates 614 arranged corresponding to the downstream flow section 6186 within the first cooling plate 615. Each of the three downstream heating plates 614B also supports two of the six downstream substrates 612B. That is, the three downstream heating plates 614B are arranged along the +X direction while supporting two downstream substrates 612B.

[0121] [Structure of the first cooling plate]

[0122] Figure 5 This is an exploded perspective view of the first cooling plate 615 as seen from the side where the light source is emitted. Figure 6 This is an exploded perspective view of the first cooling plate 615 as seen from the side opposite to where the light source is emitted.

[0123] The first cooling plate 615 has an internal cooling flow path for coolant to circulate, and transfers the heat to a heat exchanger for the coolant. For example... Figure 5 and Figure 6 As shown, the first cooling plate 615 has a first plate element 616 and a second plate element 618, and the second plate element 618 is fixed to the first plate element 616 by a plurality of screws SC.

[0124] [Structure of elements in panel 1]

[0125] like Figure 5 As shown, the first plate element 616 has a first surface 616A on which a plurality of first heating plates 614 are disposed. Three upstream heating plates 614A are disposed in the +Y direction portion of the first surface 616A in a manner capable of heat transfer, and three downstream heating plates 614B are disposed in the -Y direction portion of the first surface 616A in a manner capable of heat transfer. That is, the first surface 616A is a heating surface that receives heat from the plurality of first heating plates 614.

[0126] like Figure 6 As shown, the first plate element 616 has a plurality of heat transfer portions 617, grooves 6161 and sealing members 6162 on the second surface 616B opposite to the first surface 616A.

[0127] Multiple heat transfer sections 617 are disposed within the recess 6183 of the second plate element 618 described later. The multiple heat transfer sections 617 include: three upstream heat transfer sections 617A disposed on the second surface 616B in the +Y direction and arranged in the +X direction; and three downstream heat transfer sections 617B disposed in the -Y direction and arranged in the +X direction.

[0128] When the first plate element 616 and the second plate element 618 are combined, the three upstream heat transfer sections 617A are disposed in the upstream flow section 6185 within the recess 6183 (see reference). Figure 6 and Figure 7 The three upstream heat transfer sections 617A are separated from each other in the +X direction. In other words, the first cooling plate 615 has a gap GP1 between the three upstream heat transfer sections 617A in the +X direction.

[0129] When the first plate element 616 and the second plate element 618 are combined, the three downstream heat transfer sections 617B are disposed in the downstream flow section 6186 within the recess 6183 (see reference). Figure 6 and Figure 7 The three downstream heat transfer sections 617B are separated from each other in the +X direction. In other words, the first cooling plate 615 has a gap GP2 between the three downstream heat transfer sections 617B in the +X direction.

[0130] The multiple heat transfer sections 617 each have multiple fins 6171 and multiple flow paths 6172.

[0131] Multiple fins 6171 extend along the +X direction (second direction) and are arranged along the +Y direction (first direction). The multiple fins are formed of a metal with high heat transfer.

[0132] Multiple flow paths 6172 are disposed between multiple fins 6171, providing pathways for coolant to flow. When multiple heat transfer sections 617 are disposed within a recess 6183, coolant within the recess 6183 flows along the multiple flow paths 6172. At this time, heat is transferred from the multiple fins 6171 to the coolant.

[0133] A groove 6161 is provided on the second surface 616B and surrounds a plurality of heat transfer portions 617 when viewed from the +Z direction, which is the side of the second plate element 618. The groove 6161 is recessed from the second surface 616B in the -Z direction.

[0134] A sealing member 6162 is disposed within a groove 6161. More specifically, the sealing member 6162 is a seal fitted within the groove 6161. The sealing member 6162 prevents coolant leakage to the outside of the first cooling plate 615 by sealing between the first plate element 616 and the second plate element 618.

[0135] [Structure of elements in panel 2]

[0136] like Figure 5 and Figure 6 As shown, the second plate element 618 is disposed on the opposite side of the first light source module 611 and the plurality of first heating plates 614 relative to the first plate element 616, and is mounted on the second surface 616B by a plurality of screws SC.

[0137] The second plate element 618 has a facing surface 618A opposite to the first plate element 616, an inflow portion 6181, an outflow portion 6182, a recess 6183, a partition wall 6184, an upstream flow portion 6185, a downstream flow portion 6186, and a connecting portion 6187.

[0138] The inflow portion 6181 is located in the end portion 618B of the second plate element 618 in the -X direction, at a position along the +Y direction (first direction) of the end portion 618B. Coolant flows into the inflow portion 6181 from the outside. The inflow portion 6181 communicates with the space within the recess 6183, and the coolant flowing into the inflow portion 6181 flows into the space within the recess 6183. In addition, the end portion 618B constitutes the end portion 615A of the first cooling plate 615 in the -X direction.

[0139] The outlet 6182 is located in the end 618B of the second plate element 618 in the -X direction, at a position in the -Y direction (opposite to the first direction) relative to the position where the inflow 6181 is located in the +Y direction. The outlet 6182 communicates with the space within the recess 6183, allowing the coolant flowing within the recess 6183 to flow outward.

[0140] The recess 6183 is located approximately in the center of the opposing surface 618A. It is a recess that is recessed to the side opposite to the first plate element 616 and is roughly rectangular when viewed from the side of the first plate element 616.

[0141] Two sides of the outer edge of the recess 6183 are along the +X direction, and the other two sides are along the +Y direction.

[0142] The partition wall 6184 divides the space within the recess 6183. Specifically, the partition wall 6184 extends from the center in the +Y direction toward the +X direction on the inner wall of the recess 6183 in the -X direction to a position that does not reach the inner edge of the recess 6183 in the +X direction.

[0143] The upstream flow section 6185 and the downstream flow section 6186 are spaces within the recess 6183 separated by the partition wall 6184. The upstream flow section 6185 is the space within the recess 6183 separated by the partition wall 6184 in the +Y direction relative to the partition wall 6184. The downstream flow section 6186 is the space within the recess 6183 separated by the partition wall 6184 in the -Y direction relative to the partition wall 6184.

[0144] When the first plate element 616 and the second plate element 618 are combined, three upstream heat transfer sections 617A are arranged in the upstream flow section 6185. Similarly, three downstream heat transfer sections 617B are arranged in the downstream flow section 6186.

[0145] A connecting portion 6187 is provided within a recess 6183 on the opposite side of the inflow portion 6181 and the outflow portion 6182, connecting the upstream flow portion 6185 and the downstream flow portion 6186. The connecting portion 6187 is formed by the partition wall 6184 not reaching the inner wall of the recess 6183 in the +X direction.

[0146] [Cooling flow path in the first cooling plate]

[0147] Figure 7 This is a diagram showing a cross-section of the first cooling plate 615 along the XY plane. In other words, Figure 7 This is a diagram showing the flow path of the coolant within the first cooling plate 615. Additionally, in Figure 7 In the image, the bold arrow AR indicates the direction of coolant flow.

[0148] like Figure 7 As shown, the coolant flowing from the inlet 6181 into the first cooling plate 615 flows in the +X direction through the upstream flow section 6185 separated by the partition wall 6184. At this time, the coolant has multiple flow paths 6172 in the upstream heat transfer section 617A located on the most upstream side of the three upstream heat transfer sections 617A (see reference). Figure 6 After flowing through the upstream flow section 6185, the coolant reaches the gap GP1 in the -X direction. Then, after flowing through the multiple flow paths 6172 of the upstream heat transfer section 617A located at the center in the +X direction, the coolant reaches the gap GP1 in the +X direction. Furthermore, after flowing through the multiple flow paths 6172 of the upstream heat transfer section 617A located at the downstream end, the coolant reaches the connecting section 6187. Thus, during the flow of the coolant in the upstream flow section 6185, heat is transferred to the coolant from the multiple fins 6171 of each of the three upstream heat transfer sections 617A.

[0149] The coolant reaching the connecting portion 6187 flows in the -Y direction within the connecting portion 6187 and in the -X direction within the downstream flow portion 6186 separated by the partition wall 6184. At this time, the coolant flows sequentially through the multiple flow paths 6172 of the downstream heat transfer portion 617B in the +X direction, the gap GP2 in the +X direction, the multiple flow paths 6172 of the central downstream heat transfer portion 617B, the gap GP2 in the -X direction, and the multiple flow paths 6172 of the downstream heat transfer portion 617B in the -X direction. Thus, during the flow of the coolant in the downstream flow portion 6186, heat is transferred to the coolant from the multiple fins 6171 of each of the three downstream heat transfer portions 617B.

[0150] The coolant flowing in the downstream flow section 6186 is discharged to the outside of the first cooling plate 615 via the outflow section 6182.

[0151] [Separate configuration of heat transfer section]

[0152] As described above, the three upstream heat transfer sections 617A are separated from each other in the +X direction of coolant flow. In other words, a gap GP1 is provided between the three upstream heat transfer sections 617A to separate adjacent upstream heat transfer sections 617A. Therefore, compared to the case where a single heat transfer section with the combined dimensions of the three upstream heat transfer sections 617A and the two gaps GP1 is provided in the +X direction instead of the three upstream heat transfer sections 617A, the pressure loss of the coolant flowing in the upstream flow section 6185 can be reduced. Therefore, even if a large pump is not used in the cooling device, the coolant can easily flow through the three upstream heat transfer sections 617A. Therefore, in addition to improving the cooling efficiency of the first cooling plate 615 on the multiple upstream substrates 612A, that is, the cooling efficiency of the light-emitting elements 613 disposed on the multiple upstream substrates 612A, it is also possible to suppress the enlargement of the projector 1.

[0153] The three downstream heat transfer sections 617B are also separated from each other in the +X direction of coolant flow by the gaps GP2. Therefore, compared to the case where a single heat transfer section with the combined dimensions of the three downstream heat transfer sections 617B and the two gaps GP2 is provided in the +X direction instead of the three downstream heat transfer sections 617B, the pressure loss of the coolant flowing in the downstream heat transfer sections 617B can be reduced. Thus, even without using a large pump in the cooling device, coolant can easily flow to the downstream flow section 6186. Therefore, in addition to improving the cooling efficiency of the first cooling plate 615 on the multiple downstream substrates 612B, i.e., the cooling efficiency of the light-emitting elements 613 disposed on the multiple downstream substrates 612B, it is also possible to suppress the enlargement of the projector 1.

[0154] [The location of the gap that separates the heat transfer parts]

[0155] Figure 8 This is a schematic diagram showing the positional relationship between the first heating plate 614 and the heat transfer section 617. In other words, Figure 8 This is a schematic diagram showing the positions where the multiple heat transfer parts 617 are separated, namely the positions of gaps GP1 and GP2.

[0156] The following describes the positions where the multiple heat transfer parts 617 are separated from each other, that is, the positions of the gaps GP1 and GP2 provided between the multiple heat transfer parts 617.

[0157] like Figure 8 As shown, the heat transfer section 617 is provided corresponding to the first heating plate 614.

[0158] Specifically, the three upstream heat transfer sections 617A are respectively provided with corresponding upstream heat receiving plates 614A.

[0159] As described above, by providing a gap GP1 between two adjacent upstream heat transfer sections 617A, the pressure loss of the coolant can be reduced. The gap GP1 provided between each of the three upstream heat transfer sections 617A corresponds to the gap between each of the three upstream heat receiving plates 614A.

[0160] Since there is no upstream heat transfer section 617A in the gap GP1, it is difficult to transfer heat to the coolant in the gap GP1. However, since the upstream heat transfer section 617A is provided corresponding to the upstream heat receiving plate 614A, the heat of the upstream substrate 612A can be efficiently transferred to the upstream heat transfer section 617A via the upstream heat receiving plate 614A. As a result, the heat of the light-emitting element 613 can be efficiently transferred from the upstream heat transfer section 617A to the coolant.

[0161] Similarly, each of the three downstream heat transfer sections 617B is provided corresponding to one of the three downstream heat receiving plates 614B. Therefore, the gap GP2 provided between each of the three downstream heat transfer sections 617B is provided corresponding to one of the three downstream heat receiving plates 614B. As described above, by providing the gap GP2 between two adjacent downstream heat transfer sections 617B, the pressure loss of the coolant can be reduced.

[0162] There is no downstream heat transfer section 617B in the gap GP2, so no heat is transferred to the coolant in the gap GP2. However, since the downstream heat transfer section 617B is provided corresponding to the downstream heat receiving plate 614B, the heat of the downstream substrate 612B can be efficiently transferred to the downstream heat transfer section 617B via the downstream heat receiving plate 614B. As a result, the heat of the light-emitting element 613 can be efficiently transferred to the coolant from the downstream heat transfer section 617B.

[0163] [Structure of the second light source section]

[0164] The second light source unit 62 has the same structure as the first light source unit 61. That is, as shown in the figure. Figure 3 As shown, the second light source unit 62 includes a second light source module 621, a plurality of second heating plates 624, and a second cooling plate 625.

[0165] The second light source module 621 has the same structure as the first light source module 611. Specifically, the first light source unit 611 is described in detail below. Figure 4 The second light source module 621 has a plurality of substrates 612, each substrate 612 having at least one light-emitting element 613. The plurality of substrates 612 include three upstream substrates 612A arranged in the +X direction and three downstream substrates 612B arranged in the +X direction.

[0166] The plurality of second heating plates 624 have the same structure as the plurality of first heating plates 614. Specifically, the plurality of second heating plates 624 include three upstream heating plates 614A arranged in the +X direction and three downstream heating plates 614B arranged in the +X direction.

[0167] The second cooling plate 625 has the same structure as the first cooling plate 615. For example, the second cooling plate 625 has an inlet portion 6181 and an outlet portion 6182.

[0168] [Flow path structure of the first and second cooling plates]

[0169] Figure 9 This is a perspective view showing the connection state between the first cooling plate 615 and the second cooling plate 625. In other words, Figure 9 This is a perspective view of a light source housing CA in which the first light source unit 61 and the second light source unit 62 are installed.

[0170] The outlet 6182 of the first cooling plate 615 is connected to the inlet 6181 of the second cooling plate 625 via a pipe CM. Therefore, as Figure 3 and Figure 9 As shown, the coolant flowing out from the outlet 6182 of the first cooling plate 615 flows into the inlet 6181 of the second cooling plate 625. Furthermore, as... Figure 9 As indicated by the dashed arrow, the coolant flowing into the second cooling plate 625 passes through the upstream flow section 6185, the connecting section 6187, and the downstream flow section 6186 of the second cooling plate 625 in sequence (see reference). Figure 5 and Figure 7 It flows through the second cooling plate 625 and is discharged from the outlet 6182.

[0171] Here, coolant at a relatively low temperature flows into the inlet 6181 of the first cooling plate 615, and the coolant, having been heated by the first cooling plate 615, flows through the inlet 6181 of the second cooling plate 625. Therefore, the temperature of the coolant increases in the following order: upstream flow section 6185 of the first cooling plate 615, downstream flow section 6186 of the first cooling plate 615, upstream flow section 6185 of the second cooling plate 625, and downstream flow section 6186 of the second cooling plate 625.

[0172] On the other hand, generally speaking, within the effective temperature range, the lower the temperature of the light-emitting element 613, the greater the amount of light emitted by the light-emitting element 613; and the higher the temperature of the light-emitting element 613, the lower the amount of light emitted by the light-emitting element 613.

[0173] Therefore, the first light source unit 61 and the second light source unit 62 are configured to combine the light emitted from the portion of the first light source unit 61 with a large amount of light emitted and the light emitted from the portion of the second light source unit 62 with a small amount of light emitted by the light combining member 63, and to combine the light emitted from the portion of the first light source unit 61 with a small amount of light emitted and the light emitted from the portion of the second light source unit 62 with a large amount of light emitted.

[0174] Specifically, such as Figure 3 As shown, the first light source unit 61 and the second light source unit 62 are configured such that light emitted from the upstream substrate 612A of the first light source unit 61 is combined with light emitted from the downstream substrate 612B of the second light source unit 62, and light emitted from the downstream substrate 612B of the first light source unit 61 is combined with light emitted from the upstream substrate 612A of the second light source unit 62. This allows for approximately uniform illuminance of the light emitted from the light source unit 6.

[0175] Furthermore, in this embodiment, in addition to separating the multiple upstream heat transfer sections 617A from each other in the +X direction, the multiple downstream heat transfer sections 617B are also separated from each other in the +X direction, thereby increasing the flow rate of the coolant. In this way, the heat transferred from the multiple light-emitting elements 613 can be easily transferred to the coolant, thus suppressing uneven brightness in the light emitted from the light source section 6.

[0176] [Effects of the first embodiment]

[0177] The projector 1 of this embodiment described above has the following effects.

[0178] The projector 1 includes: a light source device 4; an image forming device 34 that modulates light emitted from the light source device 4 to form image light; and a projection optical device 36 that projects the image light formed by the image forming device 34.

[0179] The light source device 4 has a light source section 6, which includes a first light source section 61 and a second light source section 62. The first light source section 61 includes a first light source module 611, a plurality of first heating plates 614, and a first cooling plate 615. The first light source module 611 corresponds to a light source module, the plurality of first heating plates 614 corresponds to a plurality of heating plates, and the first cooling plate 615 corresponds to a cooling plate. The first light source module 611 has a plurality of substrates 612 on which light-emitting elements 613 are disposed. The plurality of first heating plates 614 are connected to the first light source module 611.

[0180] The first cooling plate 615 is connected to a plurality of first heating plates 614 respectively, and coolant flows inside it. The first cooling plate 615 has an inlet 6181, an outlet 6182, an upstream flow section 6185, a downstream flow section 6186 and a plurality of heat transfer sections 617.

[0181] An inflow portion 6181 is provided in the first cooling plate 615 at a position in the +Y direction (first direction) of the end portion 615A along the -X direction, into which coolant flows. An outflow portion 6182 is provided in the end portion 615A at a position in the -Y direction relative to the +Y direction portion where the inflow portion 6181 is provided, for coolant to flow out. In the upstream flow portion 6185, the coolant flowing in from the inflow portion 6181 flows in the +X direction (second direction). In the downstream flow portion 6186, the coolant flowing in the upstream flow portion 6185 flows in the -X direction. A plurality of heat transfer portions 617 are respectively provided in the upstream flow portion 6185 and the downstream flow portion 6186, arranged in the +X direction.

[0182] Multiple heat transfer sections 617 have multiple fins 6171 and multiple flow paths 6172. The multiple fins 6171 extend along the +X direction and are arranged along the +Y direction. The multiple flow paths 6172 are flow paths through which coolant can flow and are disposed between the multiple fins 6171. Multiple first heating plates 614 are arranged along the +X direction corresponding to the upstream flow section 6185 and the downstream flow section 6186. The multiple heat transfer sections 617 are separated from each other between the multiple first heating plates 614 in the +X direction.

[0183] The second light source unit 62 includes: a second light source module 621 having the same structure as the first light source module 611; a plurality of second heating plates 624 having the same structure as the plurality of first heating plates 614; and a second cooling plate 625 having the same structure as the first cooling plate 615. That is, the second light source module 621 is equivalent to a light source module, the plurality of second heating plates 624 are equivalent to a plurality of heating plates, and the second cooling plate 625 is equivalent to a cooling plate.

[0184] With this structure, compared to the case where multiple heat transfer sections 617 are provided in the +X direction and a single heat transfer section has a gap length corresponding to the length of the gap, the flow path 6172 along the +X direction can be shortened in each heat transfer section 617, thus reducing the pressure loss of the coolant. This allows the coolant to flow easily in the multiple heat transfer sections 617, thereby increasing the coolant flow rate in the first cooling plate 615 without using a large pump. Therefore, the cooling efficiency of the first cooling plate 615, which transfers heat from the first light source module 611 via the first heating plate 614, can be improved. The same applies to the second light source section 62, which has a second light source module 621, multiple second heating plates 624, and a second cooling plate 625.

[0185] Furthermore, the positions where the multiple heat transfer sections 617 are separated from each other correspond to the positions between the multiple first heating plates 614 arranged in the +X direction. This allows the positions where the multiple heat transfer sections 617 are separated to be positioned where heat transfer from the multiple first heating plates 614 to the first cooling plate 615 is difficult. In other words, heat can be easily transferred from the multiple first heating plates 614 to the multiple heat transfer sections 617. Therefore, heat generated by the first light source module 611 can be easily transferred to the multiple heat transfer sections 617, and heat can be transferred to the coolant through the multiple heat transfer sections 617, thereby improving the cooling efficiency of the first light source module 611. The same applies to the second light source section 62.

[0186] As described above, without the need for a large pump, the coolant can easily flow through the first cooling plate 615 and the second cooling plate 625, thus enabling miniaturization of the projector 1. Furthermore, since the cooling efficiency of the first light source module 611 and the second light source module 621 is increased, the amount of light emitted from each light source module 611, 621 can be easily increased. Therefore, the brightness of the projected image can be improved.

[0187] In the light source device 4, the first cooling plate 615 has a partition wall 6184 that extends in the +X direction and divides the internal space of the first cooling plate 615 into an upstream flow section 6185 and a downstream flow section 6186.

[0188] With this structure, compared to the case where the upstream flow section 6185 and the downstream flow section 6186 are surrounded by different outer walls, the distance between the upstream flow section 6185 and the downstream flow section 6186 in the +Y direction can be shortened. Therefore, the first cooling plate 615 and the second cooling plate 625 can be miniaturized.

[0189] In the light source device 4, a plurality of heat transfer sections 617 are provided in the upstream flow section 6185 and the downstream flow section 6186 along the +X direction. That is, the plurality of heat transfer sections 617 include a plurality of upstream heat transfer sections 617A disposed in the upstream flow section 6185 and arranged along the +X direction, and a plurality of downstream heat transfer sections 617B disposed in the downstream flow section 6186 and arranged along the +X direction.

[0190] With this structure, the pressure loss of the coolant in the upstream flow section 6185 and the downstream flow section 6186 can be reduced respectively. Therefore, without using a large pump, the cooling efficiency of the first cooling plate 615, which transfers heat from the first light source module 611 via the first heating plate 614, can be further improved. The same applies to the second cooling plate 625.

[0191] Furthermore, in the first light source unit 61, heat generated by the first light source module 611 can be easily transferred to multiple heat transfer sections 617 in both the upstream flow section 6185 and the downstream flow section 6186. Therefore, the multiple heat transfer sections 617 transfer heat to the coolant, thereby improving the cooling efficiency of the first light source module 611. The same applies to the second light source unit 62.

[0192] In the light source device 4, the plurality of first heating plates 614 include an upstream heating plate 614A disposed corresponding to the upstream flow section 6185 and a downstream heating plate 614B disposed corresponding to the downstream flow section 6186.

[0193] With this structure, heat from the substrate 612, on which the light-emitting element 613 is disposed, can be transferred via the upstream heating plate 614A to the heat transfer section 617 (upstream heat transfer section 617A) disposed in the upstream flow section 6185. Similarly, heat from the substrate 612, on which the light-emitting element 613 is disposed, can be transferred via the downstream heating plate 614B to the heat transfer section 617 (downstream heat transfer section 617B) disposed in the downstream flow section 6186. Thus, heat generated by the first light source module 611 can be easily transferred to the coolant flowing in the upstream flow section 6185 and the downstream flow section 6186, respectively, via the upstream heat transfer section 617A and the downstream heat transfer section 617B. Therefore, the cooling efficiency of the first light source module 611 can be improved. The same applies to the second light source section 62, which has the same structure as the first light source section 61.

[0194] The first cooling plate 615 is a cooling plate in which coolant can flow. The first cooling plate 615 has an inlet 6181, an outlet 6182, an upstream flow section 6185, a downstream flow section 6186, and multiple heat transfer sections 617. The inlet 6181 is located in the +Y direction (first direction), and coolant flows into the inlet 6181. The outlet 6182 is located in the -Y direction, allowing coolant to flow out. In the upstream flow section 6185, coolant flowing in from the inlet 6181 flows in the +X direction (second direction). In the downstream flow section 6186, coolant flowing in the upstream flow section 6185 flows in the -X direction. The multiple heat transfer sections 617 are arranged along the +X direction in the upstream flow section 6185 and the downstream flow section 6186, respectively. The multiple heat transfer sections 617 have multiple fins 6171 and multiple flow paths 6172. Multiple fins 6171 extend along the +X direction and are arranged along the +Y direction. Multiple flow paths 6172 are disposed between the multiple fins 6171, allowing coolant to flow through the multiple flow paths 6172. Multiple heat transfer sections 617 are separated from each other in the +X direction.

[0195] With this structure, compared to the case where multiple heat transfer sections 617 are provided in the +X direction and a single heat transfer section corresponds to the length of the gap, the flow path 6172 along the +X direction can be shortened in each heat transfer section 617, thus reducing the pressure loss of the coolant. This allows the coolant to flow easily through the multiple heat transfer sections 617, thereby increasing the coolant flow rate in the first cooling plate 615 without using a large pump. Therefore, the cooling efficiency of the first cooling plate 615 can be improved. The same applies to the second cooling plate 625, which has the same structure as the first cooling plate 615.

[0196] [Modifications of the first embodiment]

[0197] In the aforementioned light source unit 6, the first light source module 611 and the second light source module 621 have three upstream-side substrates 612A and three downstream-side substrates 612B. However, this is not a limitation; the number of upstream-side substrates 612A and downstream-side substrates 612B in the first light source module 611 can be appropriately changed, and the number of upstream-side substrates 612A and downstream-side substrates 612B in the second light source module 621 can also be appropriately changed.

[0198] Figure 10 This is a schematic diagram of the first light source section 61A, a modified version of the first light source section 61, viewed from the side where the light is emitted from the light source.

[0199] For example, instead of the first light source unit 61, a different light source unit 6 can be used in the light source unit 6. Figure 10 The first light source unit 61A shown.

[0200] The first light source unit 61A includes a first light source module 611A, multiple first heating plates 614, and a first cooling plate 615.

[0201] In the first light source unit 61A, three first heating plates 614 are provided, including two upstream heating plates 614A and one downstream heating plate 614B.

[0202] One of the two upstream heating plates 614A is configured corresponding to one of the three upstream heat transfer sections 617A in the -X direction, and the other upstream heating plate 614A is configured corresponding to one of the three upstream heat transfer sections 617A in the +X direction.

[0203] One downstream heating plate 614B and one of the three downstream heat transfer sections 617B are respectively arranged with the downstream heat transfer section 617B located in the center in the +X direction.

[0204] The first light source module 611A emits light in the -Z direction. The first light source module 611A has multiple substrates 612 on which light-emitting elements 613 are disposed. Specifically, the first light source module 611A has multiple substrates 612 including four upstream substrates 612A and two downstream substrates 612B.

[0205] Two of the four upstream-side substrates 612A are disposed on the upstream-side heating plate 614A in the -X direction, and the other two upstream-side substrates 612A are disposed on the upstream-side heating plate 614A in the +X direction. Two downstream-side substrates 612B are disposed on one downstream-side heating plate 614B.

[0206] The light source device 4, which has a first light source unit 61A instead of the first light source unit 61, can also achieve the same effect as the light source device 4 with the first light source unit 61. Furthermore, the second light source unit 62 can also have the same structure as the first light source unit 61A.

[0207] [Second Implementation]

[0208] Next, the second embodiment of this disclosure will be described.

[0209] The projector of this embodiment has the same structure as the projector 1 of the first embodiment, but the difference lies in the structure of the substrate and the structure of the heating plate of the light source device. Furthermore, in the following description, parts that are the same as or substantially the same as those already described are marked with the same reference numerals and their descriptions are omitted.

[0210] [Brief Structure of Projector and Light Source Device]

[0211] Figure 11 This is a schematic diagram of the first light source unit 64 of the light source device 4 of the projector in this embodiment, viewed from the side where the light is emitted.

[0212] The projector in this embodiment, in addition to replacing the first light source unit 61 of the first embodiment, has Figure 11 Except for the first light source unit 64 shown, the light source device 4 of this embodiment has the same structure and function as the projector 1 of the first embodiment. That is, except that the light source device 4 of this embodiment has the first light source unit 64 instead of the first light source unit 61 of the first embodiment, it has the same structure and function as the light source device 4 of the first embodiment.

[0213] [Structure of the first light source section]

[0214] The first light source unit 64 emits light as blue light BLs in the -Z direction, just like the first light source unit 61. The first light source unit 64 includes a first light source module 641, a plurality of first heat receiving plates 644, and a first cooling plate 615.

[0215] [Structure of the first light source module]

[0216] The first light source module 641 has a plurality of substrates 642. In this embodiment, the first light source module 641 has six substrates 642 arranged in the +X direction.

[0217] Multiple substrates 642 are arranged in the +X direction, spanning the positions corresponding to the upstream flow section and the downstream flow section in the first cooling plate 615, respectively.

[0218] Multiple substrates 642 respectively support multiple light-emitting elements 613 arranged in a matrix in the +X and +Y directions. Specifically, in one substrate 642, two light-emitting elements 613 are arranged in the +X direction and four in the +Y direction, for a total of eight. Among the eight light-emitting elements 613 disposed in one substrate 642, the four light-emitting elements 613 in the +Y direction are arranged at positions corresponding to the upstream flow section, and the four light-emitting elements 613 in the -Y direction are arranged at positions corresponding to the downstream flow section. Furthermore, the upstream and downstream flow sections are the same as those in the first embodiment. Figure 5 The upstream flow section 6185 and the downstream flow section 6186 shown have the same structure.

[0219] [Structure of the first heating plate]

[0220] Multiple first heating plates 644 are disposed between the first light source module 641 and the first cooling plate 615, supporting each substrate 642. The dimension of the first heating plate 644 in the +X direction is smaller than the dimension of the substrate 642 in the +X direction.

[0221] Multiple first heating plates 644 are arranged in the +X direction. Moreover, the multiple first heating plates 644 are respectively connected to the ends of the corresponding substrates 642 in the +X direction.

[0222] Specifically, the first heating plate 644 disposed at the end in the +X direction is connected to the end of the base 642 disposed at the end in the +X direction. The first heating plate 644 disposed at the end in the -X direction is connected to the end of the base 642 disposed at the end in the -X direction. Other first heating plates 644 are disposed between two adjacent bases 642 in such a way that they are connected to the ends of the bases 642 disposed in the +X direction and the ends of the bases 642 disposed in the -X direction. In other words, each first heating plate 644 is disposed between two adjacent light-emitting elements 613 in the +X direction among the plurality of light-emitting elements 613 in the first light source module 641.

[0223] In this way, the plurality of first heating plates 644 are respectively connected to the ends of the corresponding base 642 in the +X direction of the plurality of bases 642.

[0224] Multiple first heating plates 644 are respectively disposed across the positions corresponding to the upstream flow portion and the downstream flow portion in the first cooling plate 615, similar to the base 642. Furthermore, the size of the first heating plate 644 in the +Y direction is larger than the size of the base 642 in the +Y direction. Therefore, the +Y end of the first heating plate 644 is located further in the +Y direction than the +Y end of the corresponding base 642, and the -Y end of the first heating plate 644 is located further in the -Y direction than the -Y end of the corresponding base 642.

[0225] In this embodiment, seven first heating plates 644 are provided.

[0226] In this first light source section 64, the gaps GP1 and GP2 of the first cooling plate 615 are positioned between the plurality of first heating plates 644. That is, the plurality of heat transfer sections 617 are separated between the plurality of first heating plates 644.

[0227] More specifically, the gap GP1 in the -X direction is positioned between the second and third first heating plates 644 counting from the end in the -X direction. The gap GP1 in the +X direction is positioned between the second and third first heating plates 644 counting from the end in the +X direction.

[0228] Similarly, the gap GP2 in the -X direction is positioned between the second and third first heating plates 644 counting from the end in the -X direction. The gap GP2 in the +X direction is positioned between the second and third first heating plates 644 counting from the end in the +X direction.

[0229] In this way, gap GP1 is positioned, and multiple upstream heat transfer parts 617A are separated from each other; gap GP2 is positioned, and multiple downstream heat transfer parts 617B are separated from each other.

[0230] Therefore, it is possible to reduce the flow in the upstream section 6185 (refer to) Figure 5 ) and downstream circulation section 6186 (refer to Figure 5 The pressure loss of the coolant flowing in the cooling plate 615 is reduced. Furthermore, the heat from the multiple substrates 642 can be efficiently transferred to the upstream heat transfer section 617A and the downstream heat transfer section 617B via the multiple first heating plates 644. Therefore, the coolant can flow easily, and the cooling efficiency of the first cooling plate 615 on the light-emitting element 613 can be improved.

[0231] Furthermore, the second light source unit 62 may have the same structure as the first light source unit 64. In this case, the pressure loss of the coolant can be reduced in the second light source unit 62, the coolant can flow easily within the second cooling plate 625, and the cooling efficiency of the second cooling plate 625 for the light-emitting element 613 can be improved.

[0232] Each of the multiple heat transfer sections 617 separates at a position corresponding to all of the multiple first heating plates 644 arranged along the +X direction, not due to coolant pressure loss. They separate from each other at positions corresponding to the specified first heating plates 644. That is, the gap GP1 may not correspond to all portions between the multiple first heating plates 644 arranged in the +X direction.

[0233] Furthermore, the locations where the multiple heat transfer sections 617 separate in the upstream heat transfer section 617A and the locations where the multiple heat transfer sections 617 separate in the downstream heat transfer section 617B are not limited to the same locations, and may also be different.

[0234] [Effects of the second implementation method]

[0235] In addition to having the same effect as the projector 1 of the first embodiment, the projector described above also has the following effects.

[0236] The projector of this embodiment has a light source device 4, which includes a light source section 6. The light source section 6 includes a first light source section 64 and a second light source section 62. The first light source section 64 includes: a first light source module 641, which has a plurality of substrates 642; a plurality of first heating plates 644; and a first cooling plate 615.

[0237] Multiple substrates 642 are arranged in the +X direction (second direction). Multiple first heating plates 644 are arranged in the +X direction and connected to the +X direction ends of corresponding substrates 642. The multiple first heating plates 644 are equivalent to multiple heating plates.

[0238] According to this structure, the heat generated by the substrate 642 is transferred to the first cooling plate 615 via the first heating plate 644 connected to the end of the substrate 642. Here, since the multiple heat transfer sections 617 are separated from each other among the multiple first heating plates 644 in the +X direction, a heat transfer section 617 is present in the first cooling plate 615 at the connection point connecting the first heating plates 644. Therefore, the heat generated by the substrate 642 can be transferred to the heat transfer section 617 via the first heating plates 644. Thus, the cooling efficiency of the first light source module 641 having multiple substrates 642 can be improved.

[0239] [Modifications of the second embodiment]

[0240] In the first light source unit 64 described above, a plurality of first heating plates 644 are connected to the ends of each substrate 642 in the +X direction. However, this is not a limitation, and they may also be connected to the central portion of each substrate 642 in the +X direction.

[0241] Figure 12 This is a schematic diagram of the first light source section 64A, a modified version of the first light source section 64, viewed from the side where the light is emitted from the light source.

[0242] For example, it can also replace the first light source unit 64 with Figure 12 The first light source unit 64A shown.

[0243] The first light source unit 64A has the same structure as the first light source unit 64, but also has multiple first heating plates 644A. The first heating plates 644A are also equivalent to heating plates.

[0244] Multiple first heating plates 644A support the base 642 in the same manner as the first heating plate 644, and transfer the heat from the base 642 to the first cooling plate 615. The multiple first heating plates 644A are disposed between the multiple first heating plates 644. The dimensions of the first heating plate 644A in the +X direction are the same as those of the first heating plate 644 in the +X direction, and the dimensions of the first heating plate 644A in the +Y direction are the same as those of the first heating plate 644 in the +Y direction.

[0245] In this first light source unit 64A, the gaps GP1 and GP2 between the plurality of heat transfer sections 617 of the first cooling plate 615 are positioned at positions corresponding to those between the first heating plate 644 and the first heating plate 644A. That is, the plurality of heat transfer sections 617 are separated from each other at the portions corresponding to those between the first heating plate 644 and the first heating plate 644A.

[0246] More specifically, the gap GP1 in the -X direction is positioned between the second first heating plate 644A and the third first heating plate 644 counting from the -X direction. The gap GP1 in the +X direction is positioned between the second first heating plate 644A and the third first heating plate 644 counting from the +X direction.

[0247] Thus, in this embodiment, the gap GP1 is positioned at a location corresponding to the light-emitting element 613, and the plurality of upstream heat transfer portions 617A are separated from each other at positions corresponding to the light-emitting element 613. In other words, the upstream flow portion 6185 (see reference) Figure 5 The multiple heat transfer parts 617 of the light-emitting element 613 are separated from each other at the position where they overlap with the light-emitting element 613.

[0248] Similarly, the gap GP2 in the -X direction is positioned between the second first heating plate 644A and the third first heating plate 644 counting from the -X direction. The gap GP2 in the +X direction is positioned between the second first heating plate 644A and the third first heating plate 644 counting from the +X direction.

[0249] Thus, in this embodiment, the gap GP2 is positioned at a location corresponding to the light-emitting element 613, and the plurality of downstream heat transfer portions 617B are separated from each other at positions corresponding to the light-emitting element 613. In other words, the downstream flow portion 6186 (see reference) Figure 5 The multiple heat transfer parts 617 of the light-emitting element 613 are separated from each other at the positions corresponding to the light-emitting element 613.

[0250] In addition to having the same effect as the light source device 4 having the first light source unit 64A as described above, the light source device 4 having the first light source unit 64A also has the following effects.

[0251] In the first light source section 64A of the light source device 4, a plurality of heat transfer sections 617 are separated from each other at positions overlapping with the light-emitting element 613.

[0252] With this structure, even if the multiple heat transfer sections 617 are separated from each other at positions corresponding to the light-emitting elements 613, heat from the multiple substrates 642 can still be transferred to the multiple heat transfer sections 617 via the multiple first heating plates 644, 644A. Therefore, in addition to easily and arbitrarily setting the number of light-emitting elements 613 disposed on the substrate 642, the degree of freedom in the layout of the light-emitting elements 613 in the substrate 642 can also be increased. Therefore, the design freedom of the first light source module 641 can be increased.

[0253] Furthermore, the second light source unit 62 may have the same structure as the first light source unit 61A. Alternatively, the first light source unit 64 may be configured to have multiple first heat receiving plates 644A instead of multiple first heat receiving plates 6444.

[0254] [Third Implementation]

[0255] Next, the third embodiment of this disclosure will be described.

[0256] The projector of this embodiment has the same structure as the projector of the second embodiment, but the structure of the heat-receiving plate that transfers the heat generated by the plurality of substrates 642 to the first cooling plate 615 is different. Furthermore, in the following description, parts that are the same as or substantially the same as those already described are marked with the same reference numerals and their descriptions are omitted.

[0257] [Brief Structure of Projector and Light Source Device]

[0258] Figure 13This is a schematic diagram of the first light source unit 65 of the light source device 4 of the projector in this embodiment, viewed from the side where the light is emitted.

[0259] The projector in this embodiment, in addition to replacing the first light source unit 61 of the first embodiment, has Figure 13 Except for the first light source unit 65 shown, the light source device 4 of this embodiment has the same structure and function as the projector 1 of the first embodiment. That is, except that the first light source unit 65 is provided in place of the first light source unit 61, the light source device 4 of this embodiment has the same structure and function as the light source device 4 of the first embodiment.

[0260] [Structure of the first light source section]

[0261] The first light source unit 65 emits light as blue light BLs in the -Z direction, just like the first light source unit 61. The first light source unit 65 includes a first light source module 641, a first heat receiving plate 654, and a first cooling plate 655. That is, in this embodiment, the first light source unit 65 has one first heat receiving plate 654.

[0262] As described above, the first light source module 641 has a plurality of substrates 642 arranged in the +X direction, and the plurality of substrates 642 each have a plurality of light-emitting elements 613 arranged in a matrix along the +X direction and the +Y direction.

[0263] [Structure of the first heating plate]

[0264] The first heating plate 654 acts as a heat-receiving plate. Viewed from the -Z direction, the first heating plate 654 is larger than the first light source module 641 and supports multiple substrates 642. The first heating plate 654 spans across the first cooling plate 615. Figure 5 The upstream flow section 6185 and the downstream flow section 6186 shown are configured.

[0265] [Structure of the first cooling plate]

[0266] The first cooling plate 655, like the first cooling plate 615 in the first embodiment, transfers heat from the plurality of substrates 642 via the first heating plate 654 to the cooling liquid flowing inside, thereby cooling the plurality of light-emitting elements 613.

[0267] The first cooling plate 655 has the same structure and function as the first cooling plate 615.

[0268] However, compared to the first cooling plate 615 having multiple heat transfer sections 617 including three upstream heat transfer sections 617A and three downstream heat transfer sections 617B, the first cooling plate 655 has multiple heat transfer sections 617 including two upstream heat transfer sections 617A and two downstream heat transfer sections 617B.

[0269] Furthermore, the inflow portion 6181 of the first cooling plate 655 is provided at the end portion 655A in the -X direction of the first cooling plate 655, located along the +Y direction of the end portion 655A. The outflow portion 6182 of the first cooling plate 655 is provided in the -Y direction of the end portion 655A, relative to the +Y direction portion where the inflow portion 6181 is provided. The end portion 618B of the second plate element 618 constitutes the end portion 655A.

[0270] In the first light source unit 65, the gaps GP1 and GP2 between the plurality of heat transfer portions 617 of the first cooling plate 615 are positioned at positions corresponding to the positions between two adjacent substrates 642 in the +X direction. More specifically, the gaps GP1 and GP2 are positioned at positions corresponding to the positions between the light-emitting elements 613 of the two adjacent substrates 642 in the +X direction. That is, the plurality of heat transfer portions 617 are disposed on two adjacent substrates 642 in the +X direction and are separated from each other at positions corresponding to the positions between two adjacent light-emitting elements 613 in the +X direction.

[0271] Specifically, the gap GP1 between the two upstream heat transfer portions 617A is positioned corresponding to the position between the two substrates 642 located centrally in the +X direction. That is, the two upstream heat transfer portions 617A are separated at the position corresponding to the position between the two substrates 642 located centrally in the +X direction. In other words, the two upstream heat transfer portions 617A are separated at the position corresponding to the light-emitting element 613 disposed in the +X direction in the substrate 642 located centrally in the +X direction and the light-emitting element 613 disposed in the -X direction in the substrate 642 located in the +X direction.

[0272] Similarly, the gap GP2 between the two downstream heat transfer portions 617B is positioned at a position corresponding to the two substrates 642 located centrally in the +X direction. That is, the two downstream heat transfer portions 617B are separated at a position corresponding to the two substrates 642 located centrally in the +X direction. In other words, the two downstream heat transfer portions 617B are separated at a position corresponding to the light-emitting element 613 disposed in the +X direction in the substrate 642 located centrally in the +X direction and the light-emitting element 613 disposed in the -X direction in the substrate 642 located in the +X direction.

[0273] By positioning the gaps GP1 and GP2 in this way, the impact on... Figure 5The pressure loss of the coolant flowing in the upstream flow section 6185 and the downstream flow section 6186 shown is reduced, and the heat from the multiple substrates 642 can be efficiently transferred to the upstream heat transfer section 617A and the downstream heat transfer section 617B via the first heating plate 654. Therefore, the coolant can flow easily, and the cooling efficiency of the first cooling plate 655 for the light-emitting element 613 can be improved.

[0274] Alternatively, the positions of gaps GP1 and GP2 may not be between the same two substrates 642. For example, gap GP1 may be positioned between the second and third substrates 642 counting from the +X direction, and gap GP2 may be positioned between the fourth and fifth substrates 642 counting from the +X direction.

[0275] Alternatively, for example, one of the gaps GP1 and GP2 can be configured at a position corresponding to the two light-emitting elements 613 adjacent to each other in the +X direction in a substrate 642.

[0276] [Effects of the third embodiment]

[0277] The projector described above in this embodiment has the same effect as the projector 1 in the first embodiment.

[0278] That is, the projector of this embodiment has a light source device 4, which includes a light source section 6, and the light source section 6 has a first light source section 65 and a second light source section 62. The first light source section 65 includes a first light source module 641, a first heating plate 654, and a first cooling plate 655. The first light source module 641 is equivalent to a light source module. The first light source module 641 has a plurality of substrates 642 on which light-emitting elements 613 are disposed. The first heating plate 654 is equivalent to a heating plate and is connected to the first light source module 641. The first cooling plate 655 is equivalent to a cooling plate and is connected to the first heating plate 654. Coolant flows inside the first cooling plate 655.

[0279] The first cooling plate 655 has an inlet 6181, an outlet 6182, an upstream flow section 6185, a downstream flow section 6186, and a plurality of heat transfer sections 617. The inlet 6181 is located along the +Y direction (first direction) of the end portion 618B, and coolant flows into the inlet 6181. The outlet 6182 is located in the -Y direction relative to the +Y direction portion of the inlet 6181 in the end portion 618B, and coolant flows out from the outlet 6182. In the upstream flow section 6185, the coolant flowing in from the inlet 6181 flows in the +X direction (second direction). In the downstream flow section 6186, the coolant flowing in the upstream flow section 6185 flows in the -X direction. The plurality of heat transfer sections 617 are respectively provided in the upstream flow section 6185 and the downstream flow section 6186, arranged in the +X direction. Multiple heat transfer sections 617 have multiple fins 6171 and multiple flow paths 6172. The multiple fins 6171 extend along the +X direction and are arranged along the +Y direction. The multiple flow paths 6172 are disposed between the multiple fins 6171 and are flow paths through which coolant can flow. Multiple substrates 642 are arranged in the +X direction. The multiple heat transfer sections 617 are separated from each other at positions corresponding to two light-emitting elements 613 arranged along the +X direction. In other words, the multiple heat transfer sections 617 are separated from each other at positions that do not overlap with two light-emitting elements 613 arranged in the +X direction.

[0280] With this structure, similar to the first cooling plate 615, the pressure loss of the coolant flowing within the first cooling plate 655 can be reduced. Therefore, the coolant can easily flow through the multiple heat transfer sections 617, thus increasing the coolant flow rate in the first cooling plate 655 without the need for a large pump. Consequently, the cooling efficiency of the first cooling plate 655, which transfers heat from the first light source module 641 via the first heating plate 654, can be improved.

[0281] Furthermore, by positioning the multiple heat transfer sections 617 separately at locations where heat is difficult to transfer from the multiple light-emitting elements 613 to the first cooling plate 655, heat from the multiple light-emitting elements 613 can be easily transferred to the multiple heat transfer sections 617. Therefore, the cooling efficiency of the first light source module 641 can be improved.

[0282] Alternatively, the second light source unit 62 may have the same structure as the first light source unit 65. In this case, the pressure loss of the coolant can be reduced in the second light source unit 62, the coolant can flow more easily within the second cooling plate 625, and the cooling efficiency of the second cooling plate 625 on the light-emitting element 613 can be improved.

[0283] Furthermore, the positions of gaps GP1 and GP2 can also be other positions. That is, the two adjacent upstream heat transfer parts 617A in the +X direction only need to be separated from each other by the two adjacent substrates 642 or the two light-emitting elements 613 in the +X direction, and the position of gap GP1 and the number of upstream heat transfer parts 617A are not limited. Similarly, the two adjacent downstream heat transfer parts 617B in the +X direction only need to be separated from each other by the two adjacent substrates 642 or the two light-emitting elements 613 in the +X direction, and the position of gap GP2 and the number of downstream heat transfer parts 617B are not limited.

[0284] [Fourth Implementation]

[0285] Next, the fourth embodiment of this disclosure will be described.

[0286] The projector of this embodiment has the same structure as the projector 1 of the first embodiment, but differs in that it is provided with a heat-receiving plate corresponding to the upstream flow portion and a heat-receiving plate corresponding to the downstream flow portion in the cooling plate. Furthermore, in the following description, parts that are the same as or substantially the same as those already described are marked with the same reference numerals and their descriptions are omitted.

[0287] [Brief Structure of Projector and Light Source Device]

[0288] Figure 14 This is a schematic diagram of the first light source unit 66 of the light source device 4 of the projector in this embodiment, viewed from the side where the light is emitted.

[0289] The projector in this embodiment, in addition to replacing the first light source unit 61 of the first embodiment, has Figure 14 Except for the first light source unit 66 shown, the light source device 4 of this embodiment has the same structure and function as the projector 1 of the first embodiment. That is, except that the light source device 4 of this embodiment has the same structure and function as the light source device 4 of the first embodiment, except that it has the first light source unit 66 instead of the first light source unit 61 of the first embodiment.

[0290] [Structure of the first light source section]

[0291] The first light source unit 66 emits light as blue light BLs in the -Z direction, just like the first light source unit 61. The first light source unit 66 includes a first light source module 661, a plurality of first heat receiving plates 664, and a first cooling plate 615.

[0292] [Structure of the first light source module]

[0293] The first light source module 661 has a plurality of substrates 662 arranged in the +X direction, and each substrate 662 has a plurality of light-emitting elements 613 arranged in a matrix along the +X and +Y directions. In this embodiment, each substrate 662 has two light-emitting elements 613 in the +X direction and two light-emitting elements 613 in the +Y direction, for a total of four light-emitting elements 613.

[0294] Multiple substrates 662 include an upstream flow portion 6185 with the first cooling plate 615 (see reference). Figure 5 Correspondingly configured and arranged along the +X direction are multiple upstream side substrates 662A and downstream flow section 6186 (see reference). Figure 5 A plurality of downstream substrates 662B are correspondingly configured and arranged along the +X direction. In this embodiment, the number of upstream substrates 662A is 6, and the number of downstream substrates 662B is 6.

[0295] [Structure of the first heating plate]

[0296] Multiple first heating plates 664 support multiple substrates 662 and transfer heat from the multiple substrates 662 to a first cooling plate 615. The multiple first heating plates 664 include an upstream heating plate 664A disposed on a first surface 616A corresponding to an upstream flow portion 6185 of the first cooling plate 615, and a downstream heating plate 664B disposed on the first surface 616A corresponding to a downstream flow portion 6186.

[0297] The upstream heating plate 664A supports six upstream substrates 662A. Viewed from the -Z direction, the upstream heating plate 664A is larger than the six upstream substrates 662A, but smaller than the upstream flow section 6185.

[0298] The downstream heating plate 664B supports six downstream substrates 662B. Viewed from the -Z direction, the downstream heating plate 664B is larger than the six downstream substrates 662B, but smaller than the downstream flow section 6186.

[0299] In the first light source unit 66, the gaps GP1 and GP2 between the plurality of heat transfer portions 617 of the first cooling plate 615 are positioned at positions corresponding to the light-emitting elements 613 of one of the plurality of substrates 662. That is, the plurality of heat transfer portions 617 are separated from each other at positions corresponding to the positions between two adjacent light-emitting elements 613 in the +X direction within one substrate 662.

[0300] In detail, the gap GP1 in the -X direction is positioned in the second upstream substrate 662A from the -X direction at a position corresponding to the two adjacent light-emitting elements 613 in the +X direction. That is, the two upstream heat transfer portions 617A in the -X direction are separated from each other at the positions corresponding to the two adjacent light-emitting elements 613 in the +X direction in the second upstream substrate 662A from the -X direction.

[0301] Furthermore, the gap GP1 in the +X direction is positioned in the second upstream substrate 662A from the +X direction at a position corresponding to the two adjacent light-emitting elements 613 in the +X direction. That is, the two upstream heat transfer portions 617A in the +X direction are separated from each other at positions corresponding to the two adjacent light-emitting elements 613 in the +X direction in the second upstream substrate 662A from the +X direction.

[0302] The two gaps GP2 between the three downstream heat transfer sections 617B are positioned in the same way as the two gaps GP1. That is, the positions at which the three downstream heat transfer sections 617B are separated from each other are the same as those of the three upstream heat transfer sections 617A.

[0303] By positioning the gaps GP1 and GP2 in this way, the impact on... Figure 5 The pressure loss of the coolant flowing in the upstream flow section 6185 and the downstream flow section 6186 is shown. Furthermore, heat from the multiple upstream substrates 662A can be efficiently transferred to the upstream heat transfer section 617A via the upstream heating plate 664A, and heat from the multiple downstream substrates 662B can be efficiently transferred to the downstream heat transfer section 617B via the downstream heating plate 664B. Therefore, coolant flow is facilitated, and the cooling efficiency of the first cooling plate 615 on the light-emitting element 613 can be improved.

[0304] In this embodiment, the positions where the two adjacent heat transfer portions 617 in the +X direction are separated, i.e., the positions of gaps GP1 and GP2, are set to correspond to the positions between adjacent light-emitting elements 613 in the +X direction. However, this is not a limitation; the positions of gaps GP1 and GP2 may also correspond to the positions between adjacent substrates 662 in the +X direction.

[0305] [Effects of the fourth implementation method]

[0306] The projector described above in this embodiment has the same effect as the projector 1 in the first embodiment.

[0307] That is, the projector of this embodiment has a light source device 4, which includes a light source section 6, and the light source section 6 has a first light source section 66 and a second light source section 62. The first light source section 66 has a first light source module 661, a plurality of first heating plates 664, and a first cooling plate 615. The first light source module 661 is equivalent to a light source module. The first light source module 661 has a plurality of substrates 662 on which light-emitting elements 613 are disposed. The plurality of first heating plates 664 are equivalent to heating plates and are connected to the first light source module 661. The first cooling plate 615 is equivalent to a cooling plate and is connected to the plurality of first heating plates 664. Coolant flows inside the first cooling plate 615.

[0308] The first cooling plate 615 is connected to a plurality of first heating plates 614, and coolant flows through it. The first cooling plate 615 has an inlet portion 6181, an outlet portion 6182, an upstream flow portion 6185, a downstream flow portion 6186, and a plurality of heat transfer portions 617. The inlet portion 6181 is located along the +Y direction (first direction) of the end portion 618B, and coolant flows into the inlet portion 6181. The outlet portion 6182 is located in the -Y direction relative to the +Y direction portion of the inlet portion 6181 in the end portion 618B, and coolant flows out from the outlet portion 6182. In the upstream flow portion 6185, the coolant flowing in from the inlet portion 6181 flows in the +X direction (second direction). In the downstream flow portion 6186, the coolant flowing in the upstream flow portion 6185 flows in the -X direction. Multiple heat transfer sections 617 are respectively disposed in the upstream flow section 6185 and the downstream flow section 6186, and are arranged in the +X direction.

[0309] The plurality of first heating plates 664 include an upstream heating plate 664A disposed corresponding to the upstream flow section 6185 and a downstream heating plate 664B disposed corresponding to the downstream flow section 6186.

[0310] The plurality of substrates 662 include: a plurality of upstream substrates 662A arranged in the +X direction and connected to the upstream heating plate 664A; and a plurality of downstream substrates 662B arranged in the +X direction and connected to the downstream heating plate 664B. The plurality of heat transfer portions 617 are separated from each other between two adjacent light-emitting elements 613 in the +X direction among the plurality of light-emitting elements 613. In other words, the plurality of heat transfer portions 617 are separated from each other at positions that do not overlap with two adjacent light-emitting elements 613 in the +X direction among the plurality of light-emitting elements 613 arranged in the +X direction.

[0311] With this structure, the pressure loss of the coolant flowing within the first cooling plate 615 can be reduced. Therefore, the coolant can easily flow through the multiple heat transfer sections 617, thus increasing the coolant flow rate in the first cooling plate 615 without the need for a large pump. Consequently, the cooling efficiency of the first cooling plate 615, which transfers heat from the first light source module 661 via the first heating plate 664, can be improved.

[0312] Furthermore, the positions where the multiple heat transfer sections 617 are separated from each other are located between the multiple light-emitting elements 613 arranged in the +X direction. Therefore, the positions where the multiple heat transfer sections 617 are separated from each other, i.e., the gaps GP1 and GP2, can be positioned where heat is difficult to transfer from the multiple light-emitting elements 613 to the first cooling plate 615. In other words, the heat transfer sections 617 are arranged corresponding to the light-emitting elements 613, thus facilitating the transfer of heat from the multiple light-emitting elements 613 to the multiple heat transfer sections 617. Therefore, the heat generated by the first light source module 661 can be easily transferred to the multiple heat transfer sections 617, improving the cooling efficiency of the first light source module 661.

[0313] Furthermore, heat from the multiple upstream substrates 662A is transferred to the upstream flow section 6185 via the upstream heating plate 664A, and heat from the multiple downstream substrates 662B is transferred to the downstream flow section 6186 via the downstream heating plate 664B. Therefore, compared to the case where the heat from the multiple upstream substrates 662A and the multiple downstream substrates 662B is concentrated in one of the upstream flow section 6185 and the downstream flow section 6186, the heat generated by the first light source module 661 can be easily transferred to the coolant flowing in the upstream flow section 6185 and the downstream flow section 6186. Thus, the cooling efficiency of the first light source module 661 can be further improved.

[0314] [Variations on the implementation method]

[0315] This disclosure is not limited to the above-described embodiments. Modifications and improvements within the scope of achieving the purpose of this disclosure are included in this disclosure.

[0316] In the above embodiments, the light source device 4 includes one of the first light source sections 61, 61A, 64, 64A, 65, and 66, a second light source section 62, and a light-combining component 63. However, it is not limited to this; the light source device of the present invention may also have a first light source section but not a second light source section or a light-combining component. On the other hand, in addition to the first light source section, the second light source section, and the light-combining component, the light source device may also have a third light source section, which has the same structure as one of the first and second light source sections. Furthermore, it is also possible that at least one of the plurality of light source sections of the light source device has the same structure as one of the first light source sections 61, 61A, 64, 64A, 65, and 66, and the remaining light source sections have the same structure as the other of the first light source sections 61, 61A, 64, 64A, 65, and 66.

[0317] In the above embodiments, the number of upstream heat transfer sections 617A disposed in the upstream flow section 6185 is 2 or 3, and the number of downstream heat transfer sections 617B disposed in the downstream flow section 6186 is 2 or 3. However, it is sufficient that the number of upstream heat transfer sections 617A is 2 or more, and the number of downstream heat transfer sections 617B is 2 or more. In addition, the number of substrates in the light source module can also be appropriately changed, and the number of light-emitting elements disposed on the substrates can also be appropriately changed. For example, the light-emitting elements mounted on one of the substrates 612 shown in the first embodiment, the substrate 612 shown in the variation of the first embodiment, and the substrate 662 shown in the fourth embodiment may be arranged in the +Y or -Y direction with 4 elements. Alternatively, the light-emitting elements mounted on one of the multiple substrates 612, 642, and 662 shown in the above embodiments may be arranged not only 1 or 2, but also 4 in the +X or -X direction.

[0318] In the above embodiments, a plurality of heat transfer sections 617 arranged in the +X direction are respectively provided in the upstream flow section 6185 and the downstream flow section 6186. However, it is not limited to this, the plurality of heat transfer sections 617 may also be provided in only one of the flow sections of the upstream flow section 6185 and the downstream flow section 6186.

[0319] In the above embodiments, the first cooling plates 615, 655 and the second cooling plate 625 have a partition wall 6184 that divides the space within the recess 6183 into an upstream flow portion 6185 and a downstream flow portion 6186. However, this is not a limitation, and the partition wall 6184 may be omitted. For example, the cooling module may also be formed in a U-shape, with the upstream portion of the internal space of the cooling module serving as the upstream flow portion and the downstream portion serving as the downstream flow portion.

[0320] In the first embodiment described above, the two substrates 612 arranged in the +X direction are supported by one first heating plate 614. In the second embodiment described above, one substrate 642 is supported by two first heating plates 644, or two first heating plates 644 and one first heating plate 644A. In the third embodiment described above, all substrates 642 are supported by one first heating plate 654. In the fourth embodiment described above, the six substrates 612 arranged in the +X direction are supported by an upstream heating plate 664A or a downstream heating plate 664B. However, this is not a limitation; the number of substrates supported by one heating plate can be appropriately varied, and the number of heating plates supporting one substrate can also be appropriately varied.

[0321] In the above embodiments, substrates 612, 642, and 662, and first heating plates 614, 644, 654, and 664, respectively, are provided with light-emitting elements 613 corresponding to the upstream flow section 6185 and the downstream flow section 6186. However, this is not a limitation; substrates and heating plates may also be provided with only one of the flow sections, the upstream flow section 6185 and the downstream flow section 6186.

[0322] In the above embodiments, the light source device 4 has Figure 2 The structure and layout shown are not limited to the examples described above. However, the structure and layout of the light source device of this disclosure are not limited to the examples described above. The same applies to projectors that have the light source device of this disclosure.

[0323] In the above embodiments, the image forming apparatus 34 has three optical modulation devices 343B, 343G, and 343R. However, it is not limited to this, and the present disclosure can also be applied to projectors that have an image forming apparatus containing two or fewer optical modulation devices or four or more optical modulation devices.

[0324] In the above embodiments, the light modulation device 343 has a transmissive liquid crystal panel with different light incident and light exit surfaces. However, it is not limited to this; the light modulation device in the projector of this disclosure can also be configured as a reflective liquid crystal panel with the same light incident and light exit surfaces. In addition, as long as the light modulation device is capable of modulating the incident light beam to form an image corresponding to image information, light modulation devices other than liquid crystals, such as devices using micromirrors like DMDs (Digital Micromirror Devices), can also be used in the projector.

[0325] In the above embodiments, examples of applying the light source device of this disclosure to a projector are given. However, it is not limited thereto, and the light source device of this disclosure can also be applied to electronic devices other than projectors, such as lighting devices and headlights of automobiles.

[0326] In the above embodiments, the cooling plate is used as a component for cooling the light-emitting element disposed on the substrate. However, it is not limited to this, and the cooling plate of this disclosure can also be used for cooling other objects.

[0327] [Summary of this disclosure]

[0328] The following is a summary published in this note.

[0329] The light source device of the first aspect of this disclosure includes: a light source module having multiple substrates on which light-emitting elements are disposed; multiple heating plates connected to the light source module; and a cooling plate connected to the multiple heating plates respectively, wherein a coolant flows through the cooling plate, the cooling plate having: an inlet portion disposed at a portion along a first direction at an end for the coolant to flow into; an outlet portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inlet portion flows along a second direction perpendicular to the first direction; and a downstream flow portion in which the coolant flowing through the upstream flow portion flows. Coolant flows in the downstream flow section in the opposite direction to the second direction; and a plurality of heat transfer sections are disposed in at least one of the upstream and downstream flow sections and arranged in the second direction. The plurality of heat transfer sections have: a plurality of fins that extend in the second direction and are arranged in the first direction; and a plurality of flow paths disposed between the plurality of fins, in which the coolant can flow. The plurality of heating plates are disposed in the second direction corresponding to the at least one flow section. The plurality of heat transfer sections are separated from each other at positions in the second direction corresponding to the positions between the plurality of heating plates.

[0330] With this structure, compared to the case of a single heat transfer section corresponding to the length of multiple heat transfer sections in the second direction, the flow path of the coolant in each heat transfer section can be shortened, thus reducing the pressure loss of the coolant. This allows the coolant to flow easily through multiple heat transfer sections, thereby increasing the coolant flow rate in the cooling plate without using a large pump. Therefore, the cooling efficiency of the cooling plate, which transfers heat from the light source module via the heated plate, can be improved.

[0331] Furthermore, the multiple heat transfer sections are separated from each other at a position between the multiple heated plates arranged in the second direction. This allows the separation of the multiple heat transfer sections to be positioned where heat is difficult to transfer from the multiple heated plates to the cooling plates. In other words, heat can be easily transferred from the multiple heated plates to the multiple heat transfer sections. Therefore, heat generated by the light source module can be easily transferred to the multiple heat transfer sections, and heat can be transferred to the coolant through the multiple heat transfer sections, thereby improving the cooling efficiency of the light source module.

[0332] In the first embodiment described above, the cooling plate may also have a partition wall that extends along the second direction, dividing the internal space of the cooling plate into an upstream flow section and a downstream flow section.

[0333] With this structure, compared to the case where the upstream and downstream flow sections are surrounded by different outer walls, the distance between the upstream and downstream flow sections in the first direction can be shortened. Therefore, the cooling plate can be miniaturized.

[0334] In the first method described above, the plurality of heat transfer parts may also be respectively disposed in the upstream flow section and the downstream flow section.

[0335] With this structure, the pressure loss of the coolant can be reduced in both the upstream and downstream flow sections, thus improving the cooling efficiency of the cooling plate that transfers heat from the light source module via the heated plate without using a large pump.

[0336] In addition, the heat generated by the light source module can be easily transferred to multiple heat transfer sections in both the upstream and downstream flow sections. As a result, the multiple heat transfer sections transfer heat to the coolant, thereby improving the cooling efficiency of the light source module.

[0337] In the first method described above, the plurality of heating plates may include: an upstream heating plate, which is configured corresponding to the upstream flow section; and a downstream heating plate, which is configured corresponding to the downstream flow section.

[0338] With this structure, heat from the substrate containing the light-emitting element can be transferred to at least one of the multiple heat transfer sections disposed in the upstream flow section via the upstream heating plate. Similarly, heat from the substrate containing the light-emitting element can be transferred to at least one of the multiple heat transfer sections disposed in the downstream flow section via the downstream heating plate. Therefore, heat generated by the light source module can be easily transferred to the coolant flowing in the upstream and downstream flow sections, respectively, via the heat transfer sections disposed in the upstream and downstream flow sections. Thus, the cooling efficiency of the light source module can be improved.

[0339] In the first method described above, the plurality of substrates may be arranged in the second direction, and the plurality of heating plates may be arranged in the second direction respectively, and connected to the ends of the corresponding substrates in the second direction.

[0340] With this structure, heat generated in the substrate is transferred to the cooling plate via a heat-receiving plate connected to the end of the substrate. Here, multiple heat transfer sections are separated from each other in the second direction among the multiple heat-receiving plates. Therefore, a heat transfer section exists at the connection point between the cooling plate and the heat-receiving plate, allowing heat generated in the substrate to be transferred to the heat transfer section via the heat-receiving plate. Thus, the cooling efficiency of a light source module having multiple substrates can be improved.

[0341] In the first method described above, the plurality of heat transfer parts may be separated from each other at the positions overlapping with the light-emitting element.

[0342] With this structure, even if multiple heat transfer sections separate at their overlapping positions with the light-emitting elements disposed on the substrate, heat from the substrate can still be transferred to the multiple heat transfer sections via multiple heating plates. Therefore, in addition to easily and arbitrarily setting the number of light-emitting elements disposed on the substrate, the layout freedom of the light-emitting elements in the substrate can also be increased. Thus, the design freedom of the light source module can be improved.

[0343] The light source device of the second aspect of this disclosure includes: a light source module having a plurality of substrates on which light-emitting elements are disposed; a heating plate connected to the light source module; and a cooling plate connected to the heating plate, wherein a coolant flows through the cooling plate, the cooling plate having: an inlet portion disposed at a portion along a first direction at an end for the coolant to flow into; an outlet portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inlet portion flows along a second direction perpendicular to the first direction; and a downstream flow portion in which the coolant flowing after passing through the upstream flow portion flows along... The opposite direction of the second direction flows in the downstream flow section; and a plurality of heat transfer sections are disposed in at least one of the upstream and downstream flow sections, arranged in the second direction, the plurality of heat transfer sections having: a plurality of fins extending along the second direction and arranged along the first direction; and a plurality of flow paths disposed between the plurality of fins, in which coolant can flow, the plurality of substrates arranged in the second direction, and the plurality of heat transfer sections being separated from each other at positions corresponding to the positions between two light-emitting elements arranged along the second direction.

[0344] Based on this structure, it can achieve the same effect as the light source device of the first method described above.

[0345] That is, compared to the case of setting one heat transfer section corresponding to the length of multiple heat transfer sections in the second direction, the flow path of the coolant in each heat transfer section can be shortened, thus reducing the pressure loss of the coolant. As a result, the coolant can easily flow in multiple heat transfer sections, so the flow rate of the coolant in the cooling plate can be increased without using a large pump, thereby improving the cooling efficiency of the cooling plate that transfers heat from the light source module to the heated plate.

[0346] Furthermore, the multiple heat transfer sections are separated from each other at positions between the multiple light-emitting elements arranged in the second direction. This allows the separation of the multiple heat transfer sections to be positioned where heat transfer from the multiple light-emitting elements to the cooling plate is difficult. In other words, the heat transfer sections are arranged corresponding to the light-emitting elements, thus facilitating heat transfer from the light-emitting elements to the multiple heat transfer sections. Therefore, heat generated by the light source module can be easily transferred to the multiple heat transfer sections, and the multiple heat transfer sections can transfer heat to the coolant, thereby improving the cooling efficiency of the light source module.

[0347] The light source device of the third aspect of this disclosure includes: a light source module having a plurality of substrates on which light-emitting elements are disposed; a plurality of heating plates connected to the light source module; and a cooling plate connected to the plurality of heating plates respectively, wherein a coolant flows through the cooling plate, the cooling plate having: an inflow portion disposed at a portion along a first direction at an end for the coolant to flow into; an outflow portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inflow portion flows along a second direction perpendicular to the first direction; and a downstream flow portion in which the coolant flowing after flowing through the upstream flow portion flows along the opposite direction of the second direction; and a plurality of heat transfer portions disposed in at least one of the upstream flow portion and the downstream flow portion. The plurality of heat transfer portions, arranged along the second direction, include: a plurality of fins extending along the second direction and arranged along the first direction; and a plurality of flow paths disposed between the plurality of fins, through which coolant can flow. A plurality of substrates are arranged in the second direction. The plurality of heating plates include: an upstream heating plate corresponding to the upstream flow portion; and a downstream heating plate corresponding to the downstream flow portion. The plurality of substrates include: a plurality of upstream substrates arranged in the second direction and connected to the upstream heating plate; and a plurality of downstream substrates arranged in the second direction and connected to the downstream heating plate. The plurality of heat transfer portions are separated from each other at positions corresponding to the positions between two light-emitting elements arranged along the second direction.

[0348] Based on this structure, it can achieve the same effect as the light source device of the first and second methods mentioned above.

[0349] That is, compared to the case of setting one heat transfer section corresponding to the length of multiple heat transfer sections in the second direction, the flow path of the coolant in each heat transfer section can be shortened, thus reducing the pressure loss of the coolant. As a result, the coolant can easily flow in multiple heat transfer sections, so the flow rate of the coolant in the cooling plate can be increased without using a large pump, thereby improving the cooling efficiency of the cooling plate that transfers heat from the light source module to the heated plate.

[0350] Furthermore, the multiple heat transfer sections are separated from each other at positions between the multiple light-emitting elements arranged in the second direction. This allows the separation of the multiple heat transfer sections to be positioned where heat transfer from the multiple light-emitting elements to the cooling plate is difficult. In other words, the heat transfer sections are arranged corresponding to the light-emitting elements, thus facilitating heat transfer from the light-emitting elements to the multiple heat transfer sections. Therefore, heat generated by the light source module can be easily transferred to the multiple heat transfer sections, and the multiple heat transfer sections can transfer heat to the coolant, thereby improving the cooling efficiency of the light source module.

[0351] Furthermore, heat from multiple upstream substrates is transferred to the upstream flow section via the upstream heating plate, and heat from multiple downstream substrates is transferred to the downstream flow section via the downstream heating plate. Therefore, compared to the case where the heat from multiple upstream and downstream substrates is concentrated in one of the upstream or downstream flow sections, the heat generated by the light source module can be easily transferred to the coolant flowing in both the upstream and downstream flow sections. Thus, the cooling efficiency of the light source module can be further improved.

[0352] In the second and third embodiments described above, the cooling plate may also have a partition wall that extends along the second direction, dividing the internal space of the cooling plate into the upstream flow section and the downstream flow section.

[0353] Based on this structure, similarly to the case described above, compared to the case where the upstream flow section and the downstream flow section are surrounded by different outer walls, the distance between the upstream flow section and the downstream flow section in the first direction can be shortened, and the cooling plate can be miniaturized.

[0354] In the second and third methods described above, the plurality of heat transfer parts may also be respectively disposed in the upstream flow section and the downstream flow section.

[0355] Based on this structure, similarly to the above, the pressure loss of the coolant can be reduced in both the upstream and downstream flow sections. Therefore, without using a large pump, the cooling efficiency of the cooling plate, which transfers heat from the light source module via the heat-receiving plate, can be improved. Furthermore, in both the upstream and downstream flow sections, heat generated by the light source module can be easily transferred to multiple heat transfer sections, thus transferring heat to the coolant and improving the cooling efficiency of the light source module.

[0356] The projector of the fourth aspect of this disclosure includes: a light source device of the first to third aspects described above; an image forming apparatus that modulates light emitted from the light source device to form image light; and a projection optical apparatus that projects the image light formed by the image forming apparatus.

[0357] Based on this structure, the same effect as the light source device of the first to third methods described above can be achieved, enabling miniaturization of the projector. Furthermore, since the cooling efficiency of the light source module is increased, the amount of light emitted from the light source module can be easily increased, thereby improving the brightness of the projected image.

[0358] The cooling plate of the fifth aspect of this disclosure is a cooling plate in which coolant can flow internally, comprising: an inlet portion disposed at a portion along a first direction at an end for the coolant to flow into; an outlet portion disposed at a portion opposite to the first direction for the coolant to flow out; an upstream flow portion in which the coolant flowing in from the inlet portion flows along a second direction perpendicular to the first direction; a downstream flow portion in which the coolant flowing after flowing in the upstream flow portion flows along the opposite direction of the second direction; and a plurality of heat transfer portions disposed at at least one of the upstream and downstream flow portions, arranged in the second direction, the plurality of heat transfer portions comprising: a plurality of fins extending along the second direction and arranged along the first direction; and a plurality of flow paths disposed between the plurality of fins, in which the coolant can flow, the plurality of heat transfer portions being separated from each other in the second direction.

[0359] With this structure, compared to the case of a single heat transfer section corresponding to the length of multiple heat transfer sections in the second direction, the flow path of the coolant in each heat transfer section can be shortened, thus reducing the pressure loss of the coolant. As a result, the coolant can easily flow through multiple heat transfer sections, thereby increasing the coolant flow rate in the cooling plate without using a large pump, and improving the cooling efficiency of the cooling plate.

Claims

1. A light source device, characterized in that, The light source device has the following features: A light source module having multiple substrates configured with light-emitting elements; Multiple heating plates, which are connected to the light source module; and Cooling plates, which are respectively connected to the plurality of heating plates, have coolant flowing inside them. The cooling plate has: An inlet section is provided at a location along the first direction from the end, for the coolant to flow into; An outlet portion is provided in the opposite direction to the first direction relative to the aforementioned portion, for the coolant to flow out; The coolant flowing in from the inlet flows in the upstream flow section along a second direction perpendicular to the first direction. The coolant that has flowed through the upstream flow section flows in the downstream flow section in the opposite direction to the second direction. as well as Multiple heat transfer sections, respectively disposed in the upstream flow section and the downstream flow section, are arranged in the second direction. The plurality of heat transfer units include: An upstream heat transfer section is disposed in the upstream flow section; and A downstream heat transfer section is disposed in the downstream flow section and is separated from the upstream heat transfer section in the first direction. The upstream heat transfer section and the downstream heat transfer section each have: Multiple fins extending along the second direction and arranged along the first direction; and Multiple flow paths are disposed between the multiple fins, and the coolant can flow through the multiple flow paths. The plurality of heating plates include: An upstream heating plate, which is disposed along the second direction corresponding to the upstream flow section; and A downstream heating plate, which is disposed along the second direction corresponding to the downstream flow section, is separated from the upstream heating plate in the first direction. The plurality of heat transfer parts are separated from each other at positions corresponding to the positions between the plurality of heated plates in the second direction.

2. The light source device according to claim 1, characterized in that, The cooling plate has a partition wall that extends along the second direction, dividing the internal space of the cooling plate into an upstream flow section and a downstream flow section.

3. The light source device according to claim 1 or 2, characterized in that, The plurality of substrates are arranged in the second direction. The plurality of heated plates are arranged in the second direction and connected to the ends of the corresponding substrates in the second direction.

4. The light source device according to claim 3, characterized in that, The plurality of heat transfer portions are separated from each other at the positions where they overlap with the light-emitting element.

5. A projector, characterized in that, This projector has the following features: The light source device according to any one of claims 1 to 4; An image forming apparatus 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 apparatus.

6. A light source device, characterized in that, The light source device has the following features: A light source module having multiple substrates configured with light-emitting elements; A heating plate connected to the light source module; and A cooling plate, connected to the heating plate, through which coolant flows. The cooling plate has: An inlet section is provided at a location along the first direction from the end, for the coolant to flow into; An outlet portion is provided in the opposite direction to the first direction relative to the aforementioned portion, for the coolant to flow out; The coolant flowing in from the inlet flows in the upstream flow section along a second direction perpendicular to the first direction. The coolant that has flowed through the upstream flow section flows in the downstream flow section in the opposite direction to the second direction. as well as Multiple heat transfer sections, disposed in at least one of the upstream flow section and the downstream flow section, are arranged in the second direction. The plurality of heat transfer parts have: Multiple fins extending along the second direction and arranged along the first direction; and Multiple flow paths are disposed between the multiple fins, and the coolant can flow through the multiple flow paths. The plurality of substrates are arranged in the second direction. The plurality of heat transfer portions are separated from each other at positions corresponding to the positions between two of the plurality of light-emitting elements arranged along the second direction.

7. The light source device according to claim 6, characterized in that, The cooling plate has a partition wall that extends along the second direction, dividing the internal space of the cooling plate into an upstream flow section and a downstream flow section.

8. The light source device according to claim 6 or 7, characterized in that, The plurality of heat transfer sections are respectively disposed in the upstream flow section and the downstream flow section.

9. A projector, characterized in that, This projector has the following features: The light source device according to any one of claims 6 to 8; An image forming apparatus 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 apparatus.

10. A light source device, characterized in that, The light source device has the following features: A light source module having multiple substrates configured with light-emitting elements; Multiple heating plates, which are connected to the light source module; and Cooling plates, which are respectively connected to the plurality of heating plates, have coolant flowing inside them. The cooling plate has: An inlet section is provided at a location along the first direction from the end, for the coolant to flow into; An outlet portion is provided in the opposite direction to the first direction relative to the aforementioned portion, for the coolant to flow out; The coolant flowing in from the inlet flows in the upstream flow section along a second direction perpendicular to the first direction. The coolant that has flowed through the upstream flow section flows in the downstream flow section in the opposite direction to the second direction. as well as Multiple heat transfer sections are disposed in at least one of the upstream flow section and the downstream flow section, and are arranged along the second direction. The plurality of heat transfer parts have: Multiple fins extending along the second direction and arranged along the first direction; and Multiple flow paths are disposed between the multiple fins, and the coolant can flow through the multiple flow paths. The plurality of substrates are arranged in the second direction. The plurality of heating plates include: An upstream heating plate, which is disposed corresponding to the upstream flow section; and A downstream heating plate is provided, corresponding to the downstream flow section. The plurality of substrates includes: Multiple upstream-side substrates, arranged in the second direction and connected to the upstream-side heating plate; and Multiple downstream substrates are arranged in the second direction and connected to the downstream heating plate. The plurality of heat transfer portions are separated from each other at positions corresponding to the positions between two of the plurality of light-emitting elements arranged along the second direction.

11. The light source device according to claim 10, characterized in that, The cooling plate has a partition wall that extends along the second direction, dividing the internal space of the cooling plate into an upstream flow section and a downstream flow section.

12. The light source device according to claim 10 or 11, characterized in that, The plurality of heat transfer sections are respectively disposed in the upstream flow section and the downstream flow section.

13. A projector, characterized in that, This projector has the following features: The light source device according to any one of claims 10 to 12; An image forming apparatus 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 apparatus.

Images