Light source device and projection display device

Abstract

Provided is a light source device capable of achieving different cooling performance according to a heat source and achieving reduction in size. This light source device comprises: a first heat source; a second heat source; a duct member that forms a first cooling air passage for cooling the first heat source and a second cooling air passage for cooling the second heat source; a first heat exchange part that is located in the first cooling air passage and radiates heat generated from the first heat source; a second heat exchange part that is located in the second cooling air passage and radiates heat generated from the second heat source; a suction fan that is located at an upstream-side end of the first cooling air passage and disposed on the upstream side of the first heat exchange part; and an exhaust fan that is located at a downstream-side end of the second cooling air passage and disposed on the downstream side of the second heat exchange part. The duct member has a partition member that separates the first cooling air passage and the second cooling air passage, and a part of the flow in the first cooling passage and a part of the flow in the second cooling passage have the same direction with the partition member interposed therebetween.

Description

Light source device and projection display device

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

[0002] Conventionally, a light source device including a plurality of light sources, a plurality of heat dissipation members, and a cooling fan has been known. For example, such a light source device includes a first light source disposed on a first surface of a support, a first heat receiving portion that receives heat generated by the first light source, and a first heat dissipation portion that receives heat from the first heat receiving portion and dissipates heat, and the first heat dissipation portion is disposed on the side of a fourth surface of the support. Further, the light source device includes a second light source disposed on a second surface of the support, a second heat receiving portion that receives heat generated by the second light source, and a second heat dissipation portion that receives heat from the second heat receiving portion and dissipates heat, and the second heat dissipation portion is disposed on the side of the fourth surface of the support, and a second heat transfer portion that transfers heat from the second heat receiving portion to the second heat dissipation portion. Furthermore, the light source device includes blowing means for blowing air to the first heat dissipation portion and the second heat dissipation portion, the first heat dissipation portion and the second heat dissipation portion are arranged side by side in the blowing direction of the blowing means, a space is provided between the second heat dissipation portion and the fourth surface, and the blowing means blows air into the space (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2017-45002

[0004] The present disclosure provides a light source device and a projection display device that can achieve different cooling performances according to heat sources and can also achieve miniaturization.

[0005] One aspect of the present disclosure is a light source device comprising: a duct member forming a first heat source, a second heat source, a first cooling air passage for cooling the first heat source, and a second cooling air passage for cooling the second heat source; a first heat exchange unit located in the first cooling air passage and dissipating heat generated from the first heat source; a second heat exchange unit located in the second cooling air passage and dissipating heat generated from the second heat source; an intake fan located at the upstream end of the first cooling air passage and positioned upstream of the first heat exchange unit; and an exhaust fan located at the downstream end of the second cooling air passage and positioned downstream of the second heat exchange unit, wherein the duct member has a partition member separating the first cooling air passage and the second cooling air passage, and a portion of the flow in the first cooling passage and a portion of the flow in the second cooling passage are in the same direction with respect to the partition member.

[0006] One aspect of this disclosure is a projection-type display device equipped with the above-described light source device.

[0007] According to this disclosure, different cooling performance can be achieved depending on the heat source, and miniaturization can also be achieved.

[0008] Diagram showing the optical configuration of the projection display device according to Embodiment 1 Front view of the light source device with multiple heat-generating elements attached to a heat sink Plan view of the light source device Perspective view of the duct member to which the heat sink is attached, viewed from the rear Exploded perspective view of the duct member in Embodiment 1 Perspective view of the main part showing the positional relationship between the heat source and the heat exchange section Perspective view of the main part showing the positional relationship between the fan and the heat exchange section Perspective view of the light source device with a portion of the heat exchange section visible from the rear Perspective view of the light source device showing the relative positional relationship between the intake fan, inlet surface, outlet surface and exhaust fan Rear view of the main part showing the degree of overlap between the intake fan and exhaust fan in the Y direction Perspective view of the first and second heat exchange sections Perspective view of the interior of the light source device in Embodiment 2, viewed from the rear Perspective view of the first and second heat exchange sections in the light source device in Embodiment 2 Exploded perspective view of the duct member in Embodiment 2

[0009] Embodiments of the present disclosure will be described in detail below, with appropriate reference to the drawings. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters and redundant explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily verbose and to facilitate understanding by those skilled in the art. The accompanying drawings and the following explanation are provided to enable those skilled in the art to fully understand the present disclosure and are not intended to limit the subject matter of the claims.

[0010] (Background to obtaining the embodiments of this disclosure) The light source device of Patent Document 1 has a configuration in which different heat pipes with different heat dissipation fins for cooling different light sources are arranged on the same airflow path and cooled in a single flow path. However, when there are multiple light sources in the light source device, the amount of heat generated may differ for each light source. For this reason, it is desirable to have different cooling performance depending on the light source, but in Patent Document 1, multiple heat dissipation fins for cooling light sources are installed on the same airflow path, making it difficult to adjust the cooling performance according to the light source, and there is room for improvement. Also, because it is a straight airflow path, the size of the light source device is simply the sum of the sizes of the individual fins, which tends to make the light source device large.

[0011] The following embodiments describe a light source device and a projection display device that can achieve different cooling performances depending on the heat source and can also be miniaturized.

[0012] [Embodiment 1] Figure 1 is a diagram showing the optical configuration of a projection display device 11 according to Embodiment 1 of the present disclosure. Embodiment 1 illustrates the case in which red component light R, green component light G, blue component light B, and yellow component light Ye1 are used as the image light.

[0013] The projection display device 11 includes an RGB light source unit 15, an excitation light source unit 13, a phosphor wheel 17, a dichroic mirror 19, a rod integrator 21, a DMD (Digital Mirror Device) 23, and a projection unit 25.

[0014] The RGB light source unit 15 is composed of, for example, a red light source, a green light source, and a blue light source. The red light source is composed of, for example, a red light source heat sink substrate, a plurality of red light source emitters, and a plurality of red light source collimating lenses. The green light source is composed of, for example, a green light source heat sink substrate, a plurality of green light source emitters, and a plurality of green light source collimating lenses. The blue light source is composed of, for example, a blue light source heat sink substrate, a plurality of blue light source emitters, and a plurality of blue light source collimating lenses. The red light source emitters, green light source emitters, and blue light source emitters are composed of, for example, laser diodes (LDs) and light-emitting diodes (LEDs). The RGB light source unit 15 may also further include, for example, mirrors and dichroic mirrors.

[0015] In this embodiment, as an example, the red light source emitter is composed of a red laser diode that emits light with a dominant wavelength of 642 nm (red component light R), the green light source emitter is composed of a green laser diode that emits light with a dominant wavelength of 525 nm (green component light G), and the blue light source emitter is composed of a blue laser diode that emits light with a dominant wavelength of 465 nm (blue component light B). However, these wavelengths are not limited; for example, the dominant wavelength of the red light source emitter may be 630.650 nm, the dominant wavelength of the green light source emitter may be 515.535 nm, and the dominant wavelength of the blue light source emitter may be 440.470 nm. The light emitted from the RGB light source unit 15 is white light, which is a composite of red component light R, green component light G, and blue component light B.

[0016] The excitation light source unit 13 is composed of, for example, an excitation light source. The excitation light source is composed of, for example, an excitation light source heat dissipation substrate, a plurality of excitation light source emitters, and a plurality of excitation light source collimating lenses. The excitation light source emitters are composed of, for example, laser diodes (LDs) or light-emitting diodes (LEDs). The excitation light source unit 13 may also further include, for example, mirrors.

[0017] In this embodiment, as an example, the excitation light source emitter is composed of a blue laser diode that emits light with a main wavelength of 455 nm (excitation light Ex). However, this wavelength is not limited; for example, the main wavelength of the excitation light source emitter may be 440.470 nm, or it may be the same main wavelength as the blue light source emitter.

[0018] The phosphor wheel 17 comprises a substrate 67, a reflective film (not shown) formed on one side of the substrate 67, a phosphor film 69 coated in an annular shape on the reflective film, and a motor 71 for rotating the substrate 67. The phosphor wheel 17 is an example of a wavelength conversion element.

[0019] The phosphor film 69 is composed of a yellow phosphor film that emits yellow light (light with a main wavelength of 560-590 nm) when irradiated with excitation light Ex. The yellow light mentioned above is an example of colored light output by a wavelength conversion element. The phosphor film 69 can be manufactured, for example, by mixing ceramic phosphor powder with an adhesive (silicone resin), coating it onto a substrate 67, and curing it at a high temperature. Examples of ceramic phosphors used in the phosphor film 69 include cerium-equipped active garnet structure phosphors such as YAG phosphors and LAG phosphors.

[0020] As the phosphor wheel 17 rotates with the motor 71, the position to which the excitation light Ex is irradiated changes circumferentially, and emitted light Ye0 is emitted from the phosphor film 69. In this embodiment, a phosphor wheel 17 is used, but a stationary, non-rotating fluorescent light source may also be used.

[0021] Returning to Figure 1, the dichroic mirror 19 has a coating characteristic that transmits red component light R, green component light G, and blue component light B, and reflects yellow component light Ye1 from the emitted light Ye0.

[0022] Referring to Figure 1, we will first explain the optical paths of the red component light R, the green component light G, and the blue component light B.

[0023] The light emitted from the RGB light source unit 15 (red component light R, green component light G, blue component light B) is guided to the rod integrator 21 via, for example, a mirror 73, a diffuser plate 75, a lens 77, a mirror 79, a diffuser plate 81, a mirror 83, a lens 85, a dichroic mirror 19, a lens 87, a mirror 89, and a lens 91.

[0024] Next, we will describe the optical path consisting of excitation light Ex, emitted light Ye0, and yellow component light Ye1.

[0025] The light emitted from the excitation light source unit 13 (excitation light Ex) is irradiated onto the phosphor wheel 17 via, for example, the diffuser plate 93, the dichroic mirror 19, the lens 95, and the lens 97. Upon irradiation with the excitation light Ex, emitted light Ye0 is emitted from the phosphor wheel 17. The emitted light Ye0 is guided to the rod integrator 21 via, for example, the lens 97, the lens 95, the dichroic mirror 19, the lens 87, the mirror 89, and the lens 91. At this time, a portion of the emitted light Ye0 is reflected by the dichroic mirror 19 to become yellow component light Ye1.

[0026] The rod integrator 21 is made of a transparent material such as glass. The rod integrator 21 homogenizes the light emitted from the RGB light source unit 15 and the light emitted from the phosphor wheel 17. The light emitted from the rod integrator 21 passes through lenses 99, 101, and 103, enters a total internal reflection prism including triangular prisms 105 and 107, and then enters the DMD 23.

[0027] The DMD 23 modulates the color component light (red component light R, green component light G, blue component light B, yellow component light Ye1) generated by the RGB light source unit 15 and the phosphor wheel 17 in a time-division manner. In detail, the DMD 23 is composed of multiple micro-mirrors, and these micro-mirrors are movable. Each micro-mirror basically corresponds to one pixel. The DMD 23 switches whether or not to reflect light towards the projection unit by modulating the angle of each micro-mirror according to the video signal.

[0028] The image light generated by the DMD23 passes through the triangular prism 105 and the triangular prism 107 and enters the projection unit 25. The image light that enters the projection unit 25 is projected onto a screen (not shown) at an enlarged size.

[0029] Figure 2 is a front view of a light source device 111 in which multiple heat-generating elements are attached to a heat sink 109.

[0030] The RGB light source unit 15 and the excitation light source unit 13 are arranged in thermal contact with a single heat sink 109 to constitute the light source device 111. The projection display device 11 according to Embodiment 1 is configured to include this light source device 111.

[0031] The light source device 111 includes a first heat source and a second heat source. The first heat source includes a first light source unit, and the second heat source includes a second light source unit. In Embodiment 1, the first light source unit is, for example, the excitation light source unit 13 described above, and the second light source unit is, for example, the RGB light source unit 15 described above.

[0032] In addition to the light source, the projection display device 11 also contains heat sources such as optical components, circuit boards, and electronic components (such as processors). The light source device 111 and the projection display device 11 may also have these optical components, circuit boards, and electronic components as heat sources.

[0033] The heat sink 109 is assembled to the duct member 113. The heat sink 109 assembled to the duct member 113 may be a separate component from the duct member 113, or it may be a component of the duct member 113 that forms a part of the duct member 113. The duct member 113 includes a lower duct 115, an upper duct 117, a partition duct 119, and fasteners such as screws 121 that fasten them together.

[0034] Figure 3 is a plan view of the light source device 111.

[0035] In a plan view, the light source device 111 has a roughly trapezoidal shape with a first surface 123 and a second surface 125 perpendicular to each other. The heat sink 109 to which the RGB light source unit 15 and the excitation light source unit 13 are fixed is mounted on a surface parallel to the first surface 123. In this embodiment, the surface to which the heat sink 109 is attached is referred to as the front of the light source device 111, the opposite side (i.e., the first surface 123) is referred to as the back, and the second surface 125 is referred to as the side. Therefore, light from the RGB light source unit 15 and the excitation light source unit 13 is emitted from the light source device 111 in the Z direction perpendicular to the front.

[0036] Figure 4A is a perspective view of the duct member 113, to which the heat sink 109 is assembled, as seen from the rear side.

[0037] The duct member 113 forms a first cooling air passage 127 for cooling the excitation light source unit 13 and a second cooling air passage 129 for cooling the RGB light source unit 15. The first cooling air passage 127 is formed in the space between the lower duct 115 and the upper duct 117, with the downstream side of the air passage partitioned by the upper duct 117 and the partition duct 119. The second cooling air passage 129 is formed in the space between the partition duct 119 and the lower duct 115. In other words, the first cooling air passage 127 and the second cooling air passage 129 formed within the duct member 113 are separated by the partition duct 119 (partition member).

[0038] The back surface of a heat sink 109, to which an excitation light source unit 13 and an RGB light source unit 15 are attached, is exposed at the front of each of the first cooling air passage 127 and the second cooling air passage 129. The first cooling air passage 127 and the second cooling air passage 129 have a rectangular through-hole 131 formed in the upstream part of the air passage, through which the heat exchange section described later passes. The first cooling air passage 127 has an intake fan mounting section 133 at the upstream end of the air passage and an outlet surface 135 at the downstream end of the air passage. The second cooling air passage 129 has an inlet surface 137 at the upstream end of the air passage and an exhaust fan mounting section 139 at the downstream end of the air passage.

[0039] It is not essential that the first cooling air passage 127 is located above (in the +Y-axis direction) the second cooling air passage 129. The first cooling air passage 127 may be located below (in the -Y-axis direction) the second cooling air passage 129.

[0040] Figure 4B is an exploded perspective view of the duct member 113 of Embodiment 1.

[0041] The duct member 113 of Embodiment 1 has a lower duct 115, an upper duct 117, a partition duct 119, and an auxiliary duct 116. The duct member 113 is formed by assembling the lower duct 115, the upper duct 117, the partition duct 119, and the auxiliary duct 116.

[0042] Figure 5 is a perspective view of the main components showing the positional relationship between the heat source and the heat exchange section.

[0043] The light source device 111 has a first heat exchange unit 141. The first heat exchange unit 141 is located inside the first cooling air passage 127 and dissipates heat generated from the excitation light source unit 13 (an example of a first heat source). The light source device 111 also has a second heat exchange unit 143. The second heat exchange unit 143 is located inside the second cooling air passage 129 and dissipates heat generated from the RGB light source unit 15 (an example of a second heat source).

[0044] The RGB light source unit 15 and the excitation light source unit 13 each have a plurality of light sources arranged side by side in the X direction. A plurality of light sources (an example of a heat source) are arranged, for example, on the downstream side of the flow path, where a heat source that requires higher cooling performance is located. The excitation light source unit 13 and the first heat exchange unit 141 are thermally contacted by a heat pipe 145. That is, the heat pipe 145 has a heat absorption part 147 contacting the back surface of the heat dissipation plate 109 corresponding to the position of the excitation light source unit 13, and the heat dissipation part 149 on the opposite side contacts the first heat exchange unit 141. The heat absorption part 147 is formed, for example, flat in order to increase the contact area with the heat dissipation plate 109. The heat pipe 145 penetrates the first heat exchange unit 141 and is formed, for example, as a circular pipe. The outer periphery of the circular pipe contacts the flange part formed in the through hole of the fin described later, thereby ensuring a large contact area with the fin. Also, since the first heat exchange unit 141 is arranged, for example, by brazing on the back surface of the heat dissipation plate 109, the excitation light source unit 13 and the first heat exchange unit 141 are partially thermally contacted even without passing through the heat pipe 145. Thus, heat transfer from the excitation light source unit 13 to the first heat exchange unit 141 is made possible.

[0045] The RGB light source unit 15 and the second heat exchange unit 143 are thermally contacted by a heat pipe 145. That is, the heat pipe 145 has a heat absorption part 147 contacting the back surface of the heat dissipation plate 109 corresponding to the position of the RGB light source unit 15, and the heat dissipation part 149 on the opposite side contacts the second heat exchange unit 143. Thereby, heat transfer from the RGB light source unit 15 to the second heat exchange unit 143 is made possible. Also, since a part of the second heat exchange unit 143 is arranged, for example, by brazing on the back surface of the heat dissipation plate 109, the RGB light source unit 15 and the second heat exchange unit 143 are partially thermally contacted even without passing through the heat pipe 145.

[0046] The heat pipe 145, as an example, has a fibrous, porous, or fin-shaped groove (wick) with small gaps provided on the inner peripheral wall of a single sealed pipe, and transports the working fluid by capillary action. In the heat pipe 145, the heat transmitted from the high-temperature heat absorption part 147 boils and evaporates the liquid in the wick, and is transported at high speed in the form of vapor to the low-temperature heat radiation part 149. The working fluid condenses there to become a liquid, penetrates into the wick, and flows back to the heat absorption part 147 again by capillary action.

[0047] FIG. 6 is a perspective view of a main part showing the positional relationship between the fan and the heat exchange part.

[0048] The light source device 111 has an intake fan 151. The intake fan 151 is located in the first cooling air passage 127 and is arranged upstream of the first heat exchange part 141. The intake fan 151 is attached to the intake fan attachment part 133 (see FIG. 4A) of the duct member 113. Further, the light source device 111 has an exhaust fan 153. The exhaust fan 153 is located in the second cooling air passage 129 and is arranged downstream of the second heat exchange part 143. The exhaust fan 153 is attached to the exhaust fan attachment part 139 (see FIG. 4A) of the duct member 113.

[0049] FIG. 7 is a perspective view of the light source device 111 with a part of the heat exchange part seen through from the back side.

[0050] On the back side of the duct member 113, the intake fan 151 of the first cooling air passage 127 and the second heat exchange part 143 are exposed in the light source device 111. Also, on the side surface side of the duct member 113, the outlet surface 135 of the first cooling air passage 127 and the exhaust fan 153 are exposed. In other words, in the light source device 111, the parts excluding the intake fan 151, the inlet surface 137, the outlet surface 135, and the exhaust fan 153 are covered by the outer shell of the duct member 113 and the heat radiation plate 109.

[0051] The light source device 111 has a partition inside the outer shell of the duct member 113 that divides into a first cooling air passage 127 and a second cooling air passage 129, which are not in series. This partition is not strictly airtight and allows for some airflow from the first cooling air passage 127 to the second cooling air passage 129. This airflow allows for adjustment of the amount of air passing through the first cooling air passage 127 and the second heat exchange section 143. As a result, the light source device 111 allows, for example, the intake fan 151 to reinforce the airflow performance of the exhaust fan 153, or conversely, the exhaust fan 153 to reinforce the airflow performance of the intake fan 151.

[0052] Figure 8 is a perspective view of the light source device 111 showing the relative positional relationship between the intake fan 151, the inlet surface 137, the outlet surface 135, and the exhaust fan 153.

[0053] In the light source device 111, the opening surface 155 of the intake fan 151 and the inlet surface 137 of the second cooling air passage 129 are located on the same first surface 123. Similarly, the opening surface 157 of the exhaust fan 153 and the outlet surface 135 of the first cooling air passage 127 are located on the same second surface 125. These first surface 123 and second surface 125 are perpendicular to each other.

[0054] Furthermore, the orthogonality between the first surface 123 and the second surface 125 includes not only orthogonality with strict precision, but also intersection angles other than orthogonality resulting from the small curvature arc sides and arc backs of the housing of the projection display device 11. In this case, the intersection angle may include, for example, a range of approximately 90° ± 10°. Also, as will be described later, since the use of the projector's corner is assumed, the angle between the two surfaces that form a typical projector corner is included in the orthogonality intended by this disclosure.

[0055] Furthermore, the light source device 111 has relatively little impact on cooling performance even if the area of ​​the outlet surface 135 of the first cooling air passage 127 is reduced. By making the area T of the outlet surface 135 of the first cooling air passage 127 smaller than the area S of the opening surface 157 of the exhaust fan 153, the duct member 113 can be made smaller. For example, the same type of axial flow blower is used for the intake fan 151 and the exhaust fan 153, but the area through which air can actually pass is smaller than the rectangular opening area required to install the fan because the fan is circular and there is shielding from the motor part. For example, if the diameter of the fan is H, even without considering shielding from the motor part, the area through which air can pass is (H / 2)^2 × π, which is about 78% (approximately 80%) of the opening area H^2 required for fan installation. If the diameter of the motor section is approximately 38% of the fan diameter (approximately 46 cm in diameter for a 120 cm square fan), the ratio of the opening area will be approximately 46%. In this way, the area T of the outlet surface 135 of the first cooling air passage 127 on the second surface 125 can be reduced to about half the area S of the opening surface 157 of the exhaust fan 153 (T ≈ S / 2). Therefore, the light source device 111 achieves miniaturization of the duct member 113 by suppressing the area of ​​the outlet surface 135 within a range that does not impair cooling performance.

[0056] Figure 9 is a rear view of the main components showing the degree of overlap between the intake fan 151 and the exhaust fan 153 in the Y direction.

[0057] In the light source device 111, the intake fan 151 and the exhaust fan 153 are arranged to overlap in a first direction (i.e., the Y direction) parallel to the first surface 123 and the second surface 125. This overlap dimension is defined, for example, as Ovl. If the height of the intake fan 151 in the Y direction is H1 and the height of the exhaust fan 153 in the Y direction is H2, and the two fans are arranged on either the first surface 123 or the second surface 125, the light source device 111 will require a height of at least (H1 + H2) in the Y direction. In contrast, according to the light source device 111 of this embodiment, since the intake fan 151 and the exhaust fan 153 are distributed to the inlet and outlet of the air passage, the height in the Y direction can be made approximately (H1 + H2 - Ovl), and the device can be made lower in profile by the amount of Ovl.

[0058] Furthermore, if the light source device 111 uses one fan to configure one or more airflow paths, it becomes necessary to use a fan with high static pressure (for example, a sirocco fan), which results in the disadvantage of increased noise.

[0059] Figure 10 is a perspective view of the main parts of the first heat exchange section 141 and the second heat exchange section 143.

[0060] In the light source device 111, the first heat exchange section 141 includes a first heat dissipation fin 159, and the second heat exchange section 143 includes a second heat dissipation fin 161. The first heat exchange section 141 and the second heat exchange section 143 may each have fins of different shapes. The first heat exchange section 141 and the second heat exchange section 143 can be formed as a single unit by having a shared bottom fin 163.

[0061] Specifically, multiple bottom fins 163 are stacked in the Y direction with predetermined spacing between them, and then fins specific to the first heat exchange section 141 and fins specific to the second heat exchange section 143 are stacked on top of them in the Y direction with predetermined spacing between them. A heat pipe 145 is integrated into the fin portion constituting the first heat exchange section 141 by passing through it in the Y direction. A heat pipe 145 is integrated into the fin portion constituting the second heat exchange section 143 by passing through it in the Y direction. As a result, the first heat exchange section 141 and the second heat exchange section 143 can be made into a continuous, integrated structure by the bottom fins 163. In this configuration, the bottom fins 163 are positioned in the aforementioned through-hole portion 131 (see Figure 4A).

[0062] Next, I will explain the function of the above-described configuration.

[0063] The light source device 111 according to Embodiment 1 is a light source device 111 having a plurality of heat sources, comprising a first heat source, a second heat source, and a heat dissipation plate 109 arranged in thermal contact with the first heat source and the second heat source. The light source device 111 has a duct member 113 that forms a first cooling air passage 127 for cooling the first heat source and a second cooling air passage 129 for cooling the second heat source. The light source device 111 has a first heat exchange unit 141 located in the first cooling air passage that dissipates heat generated from the first heat source, and a second heat exchange unit 143 located in the second cooling air passage that dissipates heat generated from the second heat source. The light source device 111 includes an intake fan 151 located in the first cooling air passage and positioned upstream of the first heat exchange unit 141, and an exhaust fan 153 located in the second cooling air passage and positioned downstream of the second heat exchange unit 143. The opening surface 155 of the intake fan 151 and the inlet surface 137 of the second cooling air passage 129 are located on the same first surface 123. The opening surface 157 of the exhaust fan 153 and the outlet surface 135 of the first cooling air passage 127 are located on the same second surface 125. The first surface 123 and the second surface 125 are perpendicular to each other.

[0064] The heat sink 109 may be one or more. If there are multiple, the first heat source may be placed on one heat sink 109 and the second heat source on another heat sink 109. The installation of the heat sink 109 may also be omitted. The opening surface 155 of the intake fan 151 is located on the first surface 123, but the first surface 123 may be a different surface from the inlet surface 137 of the second cooling air passage 129. The opening surface 157 of the exhaust fan 153 is located on the second surface 125, but the second surface 125 may be a different surface from the outlet surface 135 of the first cooling air passage 127. The first surface 123 and the second surface 125 may intersect in a manner other than perpendicular to each other.

[0065] In the light source device 111 according to Embodiment 1, the first heat source and the second heat source are arranged on a single heat sink 109. That is, heat sources with different heat generation amounts are arranged on the heat sink 109 in thermal contact. This heat sink 109 is assembled to a duct member 113. The heat sink 109 assembled to the duct member 113 may be a separate component from the duct member 113, or it may be a component that forms a part of the duct member 113. Furthermore, the heat sink 109 does not necessarily have to be a single component; the first heat source and the second heat source may each be arranged on separate heat sinks and assembled to the duct member 113.

[0066] The duct member 113 forms a first cooling air passage 127 for cooling a first heat source and a second cooling air passage 129 for cooling a second heat source in parallel (two-flow channel configuration). Specifically, the first cooling air passage 127 and the second cooling air passage 129 are separated by a partition duct 119 (partition member), and the two-flow channel configuration is such that the airflow in each is in the same direction on either side of the partition duct 119. In other words, the inside of the outer shell of the duct member 113 is divided into the first cooling air passage 127 and the second cooling air passage 129, which are not in series. This partition does not need to be a partition with strict airtightness.

[0067] A first cooling air passage 127, located inside the duct member 113, is provided with a first heat exchange section 141 that dissipates heat generated from the first heat source. A second cooling air passage 129, also located inside the duct member 113, is provided with a second heat exchange section 143 that dissipates heat generated from the second heat source. In other words, the heat generated by the first heat source is transferred to the heat sink 109, and then from the heat sink 109 to the first heat exchange section 141. Similarly, the heat generated by the second heat source is transferred to the heat sink 109, and then from the heat sink 109 to the second heat exchange section 143.

[0068] Here, the heat sink 109 and the first heat exchange section 141, and the heat sink 109 and the second heat exchange section 143 are connected by different heat pipes 145. In other words, there are at least two or more heat pipes 145, one for the first heat exchange section 141 and one for the second heat exchange section 143. One end of the heat pipe 145 is a heat absorption section 147 that contacts the heat sink 109, which is a high heat source, and the other end is a heat dissipation section 149 that contacts the heat exchanger, which is a low heat source. The heat transfer from the heat absorption section 147 to the heat dissipation section 149 within the heat pipe may be much larger than that of metal heat conduction.

[0069] As mentioned above, since the first heat exchange section 141 and the second heat exchange section 143 are in contact with the heat sink 109, heat transfer is possible even without the heat pipes 145. In particular, since the first heat exchange section 141 is located on the back of the excitation light source unit 13, the same effect can be obtained even without the heat pipes 145. Reducing the number of heat pipes 145 makes it possible to provide a light source device at an even lower cost. Furthermore, the same effect can be obtained by using a material with a heat diffusion effect, such as a vapor chamber, instead of heat pipes.

[0070] The duct member 113 is provided with an intake fan 151 and an exhaust fan 153. The intake fan 151 is located in the first cooling air passage and is positioned upstream of the first heat exchange unit 141. The exhaust fan 153 is located in the second cooling air passage and is positioned downstream of the second heat exchange unit 143.

[0071] When the intake fan 151 is driven, outside air is drawn in through the opening 155 of the intake fan 151, passes through the first cooling air passage 127, and is discharged to the outside through the outlet 135 of the first cooling air passage 127. When the exhaust fan 153 is driven, the air in the second cooling air passage 129 is discharged to the outside through the opening 157 of the exhaust fan 153, and in response, outside air is drawn into the second cooling air passage 129 from the inlet 137 of the second cooling air passage 129.

[0072] Therefore, the first heat source and the second heat source are driven, and heat is transferred to the heat sink 109 by thermal conduction. When the heat sink 109 becomes hot, a temperature difference is created between the hot heat sink 109 and the cold first heat exchange section 141 and the second heat exchange section 143. The heat from the heat sink 109 is transferred to the first heat exchange section 141 and the second heat exchange section 143 by the heat pipe 145. In addition, since the first heat exchange section 141 and the second heat exchange section 143 are in contact with the heat sink 109, some of the heat is transferred directly from the heat sink 109 to the first heat exchange section 141 and the second heat exchange section 143.

[0073] The first heat exchange section 141 and the second heat exchange section 143, which have become hot due to heat transfer from the heat sink 109 and heat pipe 145, transfer heat to the air passing through their respective cooling air passages. As a result, the duct member 113 exhausts the hot air to the outside through the outlet surface 135 of the first cooling air passage 127 and the opening surface 157 of the exhaust fan 153.

[0074] In this configuration, the light source device 111 has the opening surface 155 of the intake fan 151 and the inlet surface 137 of the second cooling air passage 129 positioned on the first surface 123, and the opening surface 157 of the exhaust fan 153 and the outlet surface 135 of the first cooling air passage 127 positioned on the second surface 125. The first surface 123 and the second surface 125 are in an orthogonal positional relationship.

[0075] In the light source device 111, a first heat source (e.g., a first light source unit) and a second heat source (e.g., a second light source unit) are arranged on one side of the heat sink 109. The heat absorption portion 147 of the heat pipe 145 is attached to the heat sink 109 in thermal contact with it. The heat dissipation portion 149 of the heat pipe 145, opposite to the heat absorption portion 147, is in contact with either the first heat exchange portion 141 or the second heat exchange portion 143.

[0076] For example, a heat pipe 145 that approaches the first heat source and has its heat absorption section 147 in contact with it will have its heat dissipation section 149 in contact with the first heat exchange section 141. Also, for example, a heat pipe 145 that approaches the second heat source and has its heat absorption section 147 in contact with it will have its heat dissipation section 149 in contact with the second heat exchange section 143. As a result, the light source device 111 can adjust the cooling performance to be different for each light source by separating the cooling air passages. Furthermore, since the light source device 111 has individual cooling fans for each cooling air passage, the rotation speed of each fan can be set individually. This improves the degree of freedom in adjusting the cooling performance of the first heat exchange section 141 and the second heat exchange section 143.

[0077] Furthermore, the design of the heat dissipation fin size in each heat exchange section becomes easier according to the cooling performance of each heat source. In addition, since heat sources requiring high cooling performance (heat dissipation section 149) can be placed downstream of the cooling air passage, the degree of freedom in the set layout can be increased. In other words, there is a need to arrange heat sources with different heat generation characteristics and different heat generation conditions in a predetermined order on a single heat sink 109. This cooling mechanism makes it easy to meet these requirements. As a result, the light source device 111 enables the realization of a cooling mechanism that is compact and easy to adjust in terms of performance.

[0078] Furthermore, a heat pipe 145 that is close to the first heat source and has its heat absorption section 147 in contact with it may have its heat dissipation section 149 in contact with the second heat exchange section 143. Alternatively, a heat pipe 145 that is close to the second heat source and has its heat absorption section 147 in contact with it may have its heat dissipation section 149 in contact with the first heat exchange section 141.

[0079] In other words, when the first heat source and the second heat source each consist of multiple light sources, the light source device 111 can divide any number of light sources into groups and connect each group to either the first heat exchange unit 141 or the second heat exchange unit 143 using any number of heat pipes 145.

[0080] As a result, even when the amount of heat generated differs for each light source, the light source device 111 can easily provide different cooling performances depending on the light source, compared to the conventional configuration in which the heat pipes 145 are arranged in the same airflow path. In other words, the light source device 111 can easily optimize the balance between the amount of heat absorbed and the amount of heat dissipated.

[0081] Furthermore, the light source device 111 can connect any number of light sources to the first heat exchange unit 141 or the second heat exchange unit 143, which are located in the first cooling air passage 127 and the second cooling air passage 129, respectively, which are arranged in parallel. As a result, the light source device 111 can be made smaller by shortening the overall length in the airflow direction of the duct member 113 compared to the case where multiple heat exchange units are arranged in series in a straight air passage.

[0082] Furthermore, the light source device 111 is equipped with an intake fan 151 in the first cooling air passage 127 and an exhaust fan 153 in the second cooling air passage 129. Therefore, the light source device 111 can suppress the enlargement of the inlet surface 137 or outlet surface 135 of the duct member 113 compared to a structure in which two blowers are placed on either the inlet surface 137 or the outlet surface 135 of the duct member 113.

[0083] Furthermore, the light source device 111 has a first surface 123 where the opening surface 155 of the intake fan 151 and the inlet surface 137 of the second cooling air passage 129 are located, and a second surface 125 where the opening surface 157 of the exhaust fan 153 and the outlet surface 135 of the first cooling air passage 127 are located, which are perpendicular to each other. Therefore, the projection display device 11 can effectively utilize the corners of the housing to compactly house the light source device 111. This also increases the density of arrangement of various components, enabling the overall miniaturization of the projection display device 11.

[0084] Furthermore, the light source device 111 occupies less space in the axial direction than in the direction perpendicular to the axis, allowing quiet axial fans (intake fan 151, exhaust fan 153) to be distributed and arranged on the first surface 123 and the second surface 125. In this way, the light source device 111 processes the heat from the heat source by distributing it between the first heat exchange section 141 and the second heat exchange section 143, thereby shortening the length of the fins in the airflow direction of the heat exchange section, and enabling even axial fans with low static pressure to exert a sufficient cooling effect. Therefore, the light source device 111 can be made quieter.

[0085] In the light source device 111, the intake fan 151 and the exhaust fan 153 may be arranged to overlap in a first direction parallel to the first surface 123 and the second surface 125.

[0086] In this light source device 111, the intake fan 151 located on the first surface 123 and the exhaust fan 153 located on the second surface 125 are arranged to overlap in a first direction (Y direction) parallel to the first surface 123 and the second surface 125. That is, the two flow paths overlap in a direction perpendicular to the flow path direction. As a result, the light source device 111 can reduce the Y direction (e.g., height direction) of the duct member 113 (reduce its height), thereby enabling miniaturization of the light source device 111.

[0087] In the light source device 111, the area of ​​the outlet surface 135 of the first cooling air passage 127 may be smaller than the area of ​​the opening surface 157 of the exhaust fan 153. Preferably, the area of ​​the outlet surface 135 of the first cooling air passage 127 may be 80% or less of the area of ​​the opening surface 157 of the exhaust fan 153. More preferably, the area of ​​the outlet surface 135 of the first cooling air passage 127 may be half or less of the area of ​​the opening surface 157 of the exhaust fan 153.

[0088] In this light source device 111, the area of ​​the outlet surface 135 of the first cooling air passage 127 is set to be smaller than the area of ​​the opening surface 157 of the exhaust fan 153 (for example, 80% or less, or half or less). Even if the area of ​​the outlet surface 135 of the first cooling air passage 127 is made relatively small, the cooling performance of the first cooling air passage 127 does not change much. In other words, even if the area of ​​the outlet surface 135 of the light source device 111 is made smaller than the area of ​​the opening surface 157 of the exhaust fan 153, the cooling performance of the first cooling air passage 127 can be maintained while achieving miniaturization of the duct member 113.

[0089] In the light source device 111, the first heat exchange section 141 includes a first heat dissipation fin 159, and the second heat exchange section 143 includes a second heat dissipation fin 161. The first heat dissipation fin 159 and the second heat dissipation fin 161 may be formed integrally.

[0090] In this light source device 111, the first heat dissipation fin 159 and the second heat dissipation fin 161 in the heat exchange section can be formed from a single sheet metal member. That is, the light source device 111 is press-formed as a single-shaped sheet metal member with both fins joined on a plane. As a result, the number of parts in the heat exchange section of the light source device 111 can be reduced. In addition, in the light source device 111, the first heat exchange section 141 and the second heat exchange section 143 are in thermal contact, so when there is excess cooling capacity in one heat exchange section, the cooling capacity of the other heat exchange section can be reinforced.

[0091] In the light source device 111, the first heat source may include a first light source unit, and the second heat source may include a second light source unit.

[0092] This light source device 111 can efficiently cool light sources that require high cooling performance. By dividing the cooling channel, the light source device 111 disperses the absorbed heat and dissipates it, thereby reducing the temperature rise of the light source. Furthermore, different light sources may require different cooling performance. Even in this case, the light source device 111 has a high degree of freedom in matching the position of the heat sink 109 that the heat absorption section 147 contacts and the position of the heat exchange section that the heat dissipation section 149 contacts, so it can cool suitably with different cooling performance.

[0093] Furthermore, if the heat sink 109 of the light source device 111 is constructed from a single component, multiple light sources can be arranged on the same heat sink 109. This reduces misalignment of the light sources, making it possible to provide a light source device with higher optical accuracy.

[0094] The projection display device 11 according to Embodiment 1 may include a light source device 111.

[0095] In the projection-type display device 11 according to Embodiment 1, the first surface 123 and the second surface 125 of the light source device 111 are, for example, orthogonal, so the corners of the housing of the projection-type display device 11 can be effectively utilized to compactly house the light source device 111. This also increases the arrangement density of various components in the projection-type display device 11, enabling miniaturization of the entire device.

[0096] In the example described, the projection display device 11 has a first heat source that is a first light source and a second heat source that is a second light source, but it is not limited to this. The first heat source and the second heat source may be optical components, circuit boards, or electronic components (such as a processor).

[0097] [Embodiment 2] Next, a light source device according to Embodiment 2 of the present disclosure will be described. The light source device of Embodiment 2 has substantially the same configuration as the light source device of Embodiment 1, but the configuration of the heat dissipation fins of the heat exchange section is slightly different. In Embodiment 2, the description of the same configuration as in Embodiment 1 will be omitted or simplified.

[0098] Figure 11 is a perspective view of the light source device 165 of Embodiment 2, seen from the rear side with a transparent view of the interior. In Embodiment 2, the same reference numerals are used for the same components as those shown in Figures 1 to 10, and redundant explanations are omitted.

[0099] The light source device 165 according to Embodiment 2 includes a first heat exchange section 141 which includes a first heat dissipation fin 167, and a second heat exchange section 143 which includes a second heat dissipation fin 169.

[0100] Figure 12 is a perspective view of the main parts of the first heat exchange section 141 and the second heat exchange section 143 in the light source device 165 of the second embodiment.

[0101] In this light source device 165, the first heat dissipation fin 167 and the second heat dissipation fin 169 are formed separately. That is, the first heat exchange section 141 and the second heat exchange section 143 do not have the bottom fin 163 shown in Embodiment 1 (see Figure 10). The first heat exchange section 141 and the second heat exchange section 143 are formed to be independent of each other. In this case as well, the independent first heat exchange section 141 and the second heat exchange section 143 may each be formed to have multiple types of fins with different shapes.

[0102] Figure 13 is an exploded perspective view of the duct member 113 of this embodiment.

[0103] The duct member 113 of this embodiment includes a lower duct 115, an upper duct 117, a partition duct 119, and an auxiliary component 118. The duct member 113 of this embodiment is constructed by assembling the lower duct 115, the upper duct 117, the partition duct 119, and the auxiliary component 118.

[0104] Thus, in the light source device 165 of the second embodiment, the first heat exchange section 141 includes a first heat dissipation fin 167, and the second heat exchange section 143 includes a second heat dissipation fin 169. The first heat dissipation fin 167 and the second heat dissipation fin 169 may be formed separately.

[0105] This light source device 165 can be formed with a simple shape in which the first heat dissipation fin 167 and the second heat dissipation fin 169 in the heat exchange section are separate components. That is, each fin of the light source device 165 can be press-formed into, for example, a simple rectangle. As a result, the light source device 165 does not require the manufacture of heat dissipation fins with complex shapes, the mold can be made inexpensive, and the cost of the heat exchange section can be reduced. In addition, the design of the heat dissipation fin size can be easily adjusted according to the cooling performance of each heat source.

[0106] Therefore, according to the light source device 111 of Embodiment 1, the light source device 165 of Embodiment 2, and the projection display device 11, different cooling performances can be achieved depending on the heat source, and miniaturization can also be achieved.

[0107] (Summary of Embodiments) Based on the above, this disclosure includes at least the following. The components etc. in parentheses are examples of those corresponding to the embodiments described above, but are not limited thereto.

[0108] [Item 1] A light source device (light source device 111) having multiple heat sources, comprising: a first heat source (excitation light source unit 13, optical component, circuit board, or electronic component); a second heat source (RGB light source unit 15, optical component, circuit board, or electronic component); a duct member (duct member 113) forming a first cooling air passage (first cooling air passage 127) for cooling the first heat source and a second cooling air passage (second cooling air passage 129) for cooling the second heat source; a first heat exchange section (first heat exchange section 141) located in the first cooling air passage and dissipating heat generated from the first heat source; and a second heat exchange section (second heat exchange section 143) located in the second cooling air passage and dissipating heat generated from the second heat source. A light source device comprising: an intake fan (intake fan 151) located in the first cooling air passage and positioned upstream of the first heat exchange section; and an exhaust fan (exhaust fan 153) located in the second cooling air passage and positioned downstream of the second heat exchange section, wherein the opening surface of the intake fan is positioned on the first surface (first surface 123), the opening surface of the exhaust fan is positioned on the second surface (second surface 125), and the first surface and the second surface intersect.

[0109] This allows the light source device to cool different heat sources using different cooling airflow paths, thus achieving different cooling performances depending on the heat source. Furthermore, since the different cooling airflow paths are not arranged in a straight line, the light source device can be miniaturized.

[0110] [Item 2] The light source device according to Item 1, wherein the intake fan and the exhaust fan are arranged to overlap in a first direction (Y direction) parallel to the first surface and the second surface.

[0111] This allows the light source device to have a shorter (lower profile) duct member along the first direction, thereby enabling miniaturization of the light source device.

[0112] [Item 3] The light source device according to Item 1, wherein the area of ​​the outlet surface (outlet surface 135) of the first cooling air passage is smaller than the area of ​​the opening surface of the exhaust fan.

[0113] This allows the light source device to achieve miniaturization of the duct components while maintaining the cooling performance of the first cooling air passage.

[0114] [Item 4] The light source device according to any one of items 1 to 3, wherein at least one of the intake fan and the exhaust fan is an axial flow fan.

[0115] This allows the light source device to have a quieter fan, and the entire photoelectric device to be quieter as well.

[0116] [Item 5] The light source device according to any one of Items 1 to 4, wherein the first heat source and the second heat source are arranged on a single heat sink (heat sink 109).

[0117] As a result, the light source device arranges multiple light sources on the same heat sink, allowing for efficient heat dissipation from multiple light sources, reducing misalignment of the light sources, and improving optical accuracy when using multiple light sources.

[0118] [Item 6] The light source device according to any one of Items 1 to 5, wherein the inlet surface (inlet surface 137) of the second cooling air passage is located on the first surface, and the outlet surface of the first cooling air passage is located on the second surface.

[0119] This allows the light source device to concentrate the openings of each fan and the inlet and outlet surfaces of each cooling air passage onto a limited surface, thereby improving the arrangement efficiency of each surface in the light source device.

[0120] [Item 7] A light source device according to any one of Items 1 to 6, wherein the first surface and the second surface are orthogonal to each other.

[0121] This improves the arrangement efficiency of the light source device, for example, when it is housed in a casing with orthogonal surfaces.

[0122] [Item 8] The light source device according to any one of items 1 to 7, wherein the first heat exchange section includes a first heat dissipation fin (first heat dissipation fin 167), the second heat exchange section includes a second heat dissipation fin (second heat dissipation fin 169), and the first heat dissipation fin and the second heat dissipation fin are integrally formed.

[0123] This allows the light source device to be press-formed as a single-shaped sheet metal member with both heat dissipation fins joined on a flat surface, thereby reducing the number of parts in the heat exchange section.

[0124] [Item 9] The light source device according to any one of items 1 to 7, wherein the first heat exchange section includes a first heat dissipation fin, the second heat exchange section includes a second heat dissipation fin, and the first heat dissipation fin and the second heat dissipation fin are formed separately.

[0125] This eliminates the need to manufacture complexly shaped heat dissipation fins for the light source device, allowing for cheaper molds and reduced costs for the heat exchange section. Furthermore, it makes it easier to design the heat dissipation fin size according to the cooling performance of each heat source.

[0126] [Item 10] The light source device according to any one of items 1 to 9, wherein the first heat source includes a first light source unit (excitation light source unit 13), and the second heat source includes a second light source unit (RGB light source unit 15).

[0127] This allows the light source device to cool different light source sections with different cooling airflow paths, enabling efficient cooling of, for example, light sources that generate a lot of heat.

[0128] [Item 11] A projection display device (projection display device 11) equipped with a light source device as described in any one of items 1 to 10.

[0129] As a result, the projection-type display device can achieve the same effect as item 1. Furthermore, even if the housing of the projection-type display device is, for example, roughly rectangular in shape, the corners of the housing can be effectively utilized to compactly house the light source device 111. Therefore, the projection-type display device can increase the density of arrangement of various components and achieve overall miniaturization of the device.

[0130] In the embodiments described above, the cases in which the opening surface 155 of the intake fan 151 is located on the first surface 123 and the opening surface 157 of the exhaust fan 153 is located on the second surface 125, and further, the cases in which the inlet surface 137 of the second cooling air passage 129 is located on the first surface 123 and the outlet surface 135 of the first cooling air passage 127 is located on the second surface 125 were described as examples. However, the present disclosure is not limited to these forms. The opening surface 155 of the intake fan 151 and the inlet surface 137 of the second cooling air passage 129 do not have to be located on the same first surface 123, but may be located side by side in close proximity to each other. Also, the opening surface 157 of the exhaust fan 153 and the outlet surface 135 of the first cooling air passage 127 do not have to be located on the same second surface 125, but may be located side by side in close proximity to each other.

[0131] The opening surface 155 of the intake fan 151 and the opening surface 157 of the exhaust fan 153 may be considered simply as "openings" rather than as "surfaces". For example, in Figure 8, the intake direction at the opening of the intake fan 151 is in the +Z direction, and the exhaust direction at the opening of the exhaust fan 153 is in the -X direction. The intake direction at the opening of the intake fan 151 and the exhaust direction at the opening of the exhaust fan 153 are perpendicular to each other. However, the intake direction and exhaust direction are not limited to being perpendicular to each other in this way; they may also be intersecting directions.

[0132] The outlet surface 135 of the first cooling air passage 127 and the inlet surface 137 of the second cooling air passage 129 may also be considered simply as "openings" rather than as "surfaces," and may be considered as the exhaust port of the first cooling air passage 127 and the intake port of the second cooling air passage 129. For example, in Figure 8, the exhaust direction at the exhaust port of the first cooling air passage 127 is in the -X direction, and the intake direction at the intake port of the second cooling air passage 129 is in the +Z direction.

[0133] In the above description, it was explained that in the light source device 111, the intake fan 151 and the exhaust fan 153 are arranged to overlap in a first direction (i.e., the Y direction) parallel to the first surface 123 and the second surface 125. For example, the first direction may be expressed as a direction perpendicular to the exhaust direction at the exhaust port of the first cooling air passage 127 and the intake direction at the intake port of the second cooling air passage 129.

[0134] The above description described a case where the first cooling air passage 127 and the second cooling air passage 129 are separated by a partition duct 119 (partition member), and the flow in each passage is in the same direction on either side of the partition duct 119. The present disclosure is not limited to this form. For example, it is sufficient if a portion of the flow in the first cooling air passage 127 and a portion of the flow in the second cooling air passage 129 are in the same direction on either side of the partition duct 119.

[0135] While embodiments have been described above with reference to the attached drawings, this disclosure is not limited to such examples. It is clear to those skilled in the art that various modifications, alterations, substitutions, additions, deletions, and equivalents can be conceived within the scope of the claims, and these are also understood to fall within the technical scope of this disclosure. Furthermore, the components of the embodiments described above can be combined in any way without departing from the spirit of the invention.

[0136] This disclosure is useful as a light source device and projection display device, etc., that can achieve different cooling performances depending on the heat source and can also be miniaturized.

[0137] 11 Projection-type display device 13 Excitation light source unit 15 RGB light source unit 109 Heat sink 111 Light source device 113 Duct member 123 First surface 125 Second surface 127 First cooling air passage 129 Second cooling air passage 135 Outlet surface 137 Inlet surface 141 First heat exchange section 143 Second heat exchange section 151 Intake fan 153 Exhaust fan 155 Opening surface 157 Opening surface 159 First heat dissipation fin 161 Second heat dissipation fin 165 Light source device 167 First heat dissipation fin 169 Second heat dissipation fin Y First direction

Claims

1. A light source device comprising: a duct member forming a first heat source, a second heat source, a first cooling air passage for cooling the first heat source, and a second cooling air passage for cooling the second heat source; a first heat exchange unit located in the first cooling air passage and dissipating heat generated from the first heat source; a second heat exchange unit located in the second cooling air passage and dissipating heat generated from the second heat source; an intake fan located at the upstream end of the first cooling air passage and positioned upstream of the first heat exchange unit; and an exhaust fan located at the downstream end of the second cooling air passage and positioned downstream of the second heat exchange unit, wherein the duct member has a partition member separating the first cooling air passage and the second cooling air passage, and the flow of a part of the first cooling passage and the flow of a part of the second cooling passage are in the same direction on either side of the partition member.

2. The light source device according to claim 1, wherein the intake direction at the opening of the intake fan and the exhaust direction at the opening of the exhaust fan are in directions that intersect each other.

3. The light source device according to claim 2, wherein an intake port is provided at the upstream end of the second cooling air passage, an exhaust port is provided at the downstream end of the first cooling air passage, the opening of the intake fan and the intake port of the second cooling air passage are arranged side by side, and the opening of the exhaust fan and the exhaust port of the first cooling air passage are arranged side by side.

4. The light source device according to claim 2 or 3, wherein the intake fan and the exhaust fan are arranged to overlap in a first direction perpendicular to the intake direction and the exhaust direction.

5. The light source device according to claim 2 or 3, wherein the area of ​​the exhaust port of the first cooling air passage is smaller than the area of ​​the opening of the exhaust fan.

6. The light source device according to claim 2 or 3, wherein at least one of the intake fan and the exhaust fan is an axial flow fan.

7. The light source device according to claim 2 or 3, wherein the first heat source and the second heat source are arranged on a single heat sink, and the single heat sink is thermally connected to the first heat exchange section and the second heat exchange section.

8. The light source device according to claim 2 or 3, wherein the intake direction at the opening of the intake fan and the exhaust direction at the opening of the exhaust fan are perpendicular to each other.

9. The light source device according to claim 2 or 3, wherein the first heat exchange section includes a first heat dissipation fin, the second heat exchange section includes a second heat dissipation fin, and the first heat dissipation fin and the second heat dissipation fin are integrally formed.

10. The light source device according to claim 2 or 3, wherein the first heat exchange section includes a first heat dissipation fin, the second heat exchange section includes a second heat dissipation fin, and the first heat dissipation fin and the second heat dissipation fin are formed separately.

11. The light source device according to claim 9, wherein the first heat source includes a first light source unit, and the second heat source includes a second light source unit.

12. The light source device according to claim 10, wherein the first heat source includes a first light source unit, and the second heat source includes a second light source unit.

13. A projection-type display device comprising the light source device described in claim 11.

14. A projection-type display device comprising the light source device described in claim 12.

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