Cooling device, light source device and projection device

Abstract

To provide a cooling device with a cooling function improved, a light source device and a projection device.SOLUTION: A cooling device comprises: a heat radiation member (92) forming a flow path P; a first heating member (94A) and a second heating member (94B) connected to the heat radiation member (92) in the flow path P; and a rectification member 924 that is provided in the flow path P, and guides cooling fluid (L) flowing in the flow path P to the second heating member (94B).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a cooling device, a light source device, and a projection device. [Background technology]

[0002] Today, projection devices (projectors) are used to project image data stored on personal computer screens, video screens, memory cards, etc. onto a screen. These projection devices focus light emitted from a light source onto a micromirror display element called a DMD (Digital Micromirror Device) or a liquid crystal panel, and display a color image on the screen.

[0003] For example, Patent Document 1 discloses a cooling device (forced air-cooled comb-shaped heat sink) in which the fins, which are the object to be cooled, are arranged in a comb shape with their tips positioned downward. This cooling device has flow straightening members (louvers) on the fins arranged on one side of a base on which a heat generating element is mounted. The flow straightening members are inclined at an angle of 10 to 45 degrees from the flow direction of the cooling fluid toward the base, and are uniformly distributed in a single row closer to the tips of the fins than the center of the cooling device in the height direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-118972 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the cooling device of Patent Document 1, the base, which is the heat generating part, is located at the upper end of the wall that forms the flow path, which results in poor heat conduction efficiency and heat dissipation efficiency, and limited cooling effect.

[0006] An object of the present invention is to provide a cooling device, a light source device, and a projection device with improved cooling performance. [Means for solving the problem]

[0007] A cooling device according to one aspect of the present invention includes a heat dissipation member that forms a flow path, a first heat generating member and a second heat generating member that are connected to the heat dissipation member within the flow path, a first straightening member that is provided within the flow path and that guides a cooling fluid flowing within the flow path to the first heat generating member, a second straightening member that guides the cooling fluid to the second heat generating member, and a cooling device that guides the cooling fluid to the first heat generating member. Above and a third heat generating element provided on the upstream side of the flow path, wherein the length of the first straightening element provided on the upstream side of the flow path is shorter than the length of the second straightening element provided on the downstream side of the flow path. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a cooling device, a light source device, and a projection device with improved cooling performance. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention. [Figure 2] FIG. 1 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention. [Figure 3] 1 is a perspective view of a cooling device according to an embodiment of the present invention; [Figure 4] FIG. 2 is a perspective view of a fin according to an embodiment of the present invention. [Figure 5] 4 is a VV cross-sectional view of the cooling device shown in FIG. 3 according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described below. Fig. 1 is a functional circuit block diagram of a projection device 10. The projection device control unit includes a CPU including an image conversion unit 23 and a control unit 38, a front-end unit including an input / output interface 22, and a formatter unit including a display encoder 24 and a display driver 26. Image signals of various standards input from an input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and system bus SB to unify them into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

[0011] Furthermore, the display encoder 24 develops and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display driver .

[0012] The display driver 26 drives the display element 51, which is a spatial light modulator (SOM), at an appropriate frame rate in response to the image signal output from the display encoder 24. The projection device 10 forms an optical image with the light reflected from the display element 51 by irradiating the light beam emitted from the light source device 60 onto the display element 51 via a light guide optical system, and projects and displays the image on a projection target such as a screen (not shown) via a projection optical system 220 (see FIG. 2). Note that the movable lens group 235 of this projection optical system 220 can be driven by a lens motor 45 for zoom adjustment and focus adjustment.

[0013] Furthermore, the image compression / expansion unit 31 performs a recording process in which the luminance signal and color difference signal of the image signal are compressed by processes such as ADCT and Huffman coding, and the data is sequentially written to a memory card 32, which is a removable recording medium. Furthermore, the image compression / expansion unit 31 reads image data recorded on the memory card 32 in the playback mode, expands each piece of image data constituting a series of moving images on a frame-by-frame basis, and outputs the expanded data to the display encoder 24 via the image conversion unit 23. Thus, the image compression / expansion unit 31 can output moving images, etc., based on the image data stored in the memory card 32.

[0014] The control unit 38 controls the operation of each circuit in the projection device 10, and is composed of a CPU, a ROM that permanently stores operation programs such as various settings, and a RAM used as a work memory.

[0015] The key / indicator section 37 is composed of main keys and indicators provided on the housing. Operation signals from the key / indicator section 37 are sent directly to the control section 38. In addition, key operation signals from the remote controller are received by the Ir receiving section 35, demodulated into code signals by the Ir processing section 36, and output to the control section 38.

[0016] The control unit 38 is connected to an audio processing unit 47 via a system bus SB. The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts audio data into analog data in the projection mode and playback mode, driving a speaker 48 to emit amplified sound.

[0017] The control unit 38 controls the light source control circuit 41. The light source control circuit 41 individually controls the operation of the excitation light irradiation device 70 (see FIG. 2) of the light source device 60 and the timing of synchronization of the phosphor wheel 101, etc., so that light in a predetermined wavelength band required for image generation is emitted from the light source device 60.

[0018] Furthermore, the control unit 38 causes the cooling fan drive control circuit 43 to detect temperatures using a plurality of temperature sensors provided in the light source device 60, etc., and controls the rotation speed of a cooling fan (not shown) in the projection device 10 based on the results of this temperature detection. The control unit 38 also controls the cooling fan drive control circuit 43 to continue rotating the cooling fan using a timer or the like even after the power to the projection device 10 main body is turned off, or to turn off the power to the projection device 10 main body based on the results of temperature detection by the temperature sensors.

[0019] FIG. 2 is a schematic plan view showing the internal structure of the projection device 10. In the following description of the projection device 10, left and right refer to the left and right directions relative to the projection direction, and front and rear refer to the front and rear directions relative to the traveling direction of the light beam of the projection device 10 (toward the screen). The projection device 10 is provided with a control circuit board 241 near the right panel 14. This control circuit board 241 includes a power supply circuit block, a light source control block, and the like. The projection device 10 also includes a light source device 60 in approximately the center of the housing of the projection device 10. The projection device 10 also includes a light source side optical system 170 and a projection optical system 220 between the light source device 60 and the left panel 15.

[0020] The light source device 60 includes an excitation light irradiating device 70, a green light source device 80 (including the excitation light irradiating device 70 and the fluorescent wheel device 100) that is a light source of green wavelength band light, and a red light source device 120 that is a light source of red wavelength band light. The light source device 60 also includes a light-guiding optical system 140 that guides the light of each color wavelength band. The light-guiding optical system 140 guides the light of each color wavelength band emitted from each device (the excitation light irradiating device 70, the green light source device 80, and the red light source device 120) to a light-source-side optical system 170.

[0021] The excitation light irradiation device 70 is disposed in the vicinity of the rear panel 13, at approximately the center in the left-right direction of the housing of the projection device 10. The excitation light irradiation device 70 includes a light source group made up of a plurality of blue laser diodes 71, which are semiconductor light-emitting elements, disposed so that their optical axes are parallel to the rear panel 13, a reflection mirror group 75 that converts the optical axis of the light emitted from each blue laser diode 71 by 90 degrees toward the front panel 12, and a heat sink 920 disposed between the blue laser diodes 71 and the right panel 14.

[0022] The light source group is formed by arranging a plurality of blue laser diodes 71 in a matrix. In the example of this embodiment, a total of six blue laser diodes 71 are arranged in a matrix of 2 rows and 3 columns as viewed from the side of the left panel 15, with the vertical direction in FIG. 2 being the rows and the direction perpendicular to the paper surface being the columns (details not shown).

[0023] A plurality of collimator lenses 73 are arranged on the optical axis of each blue laser diode 71 to convert blue wavelength band light emitted from each blue laser diode 71 into parallel light so as to increase the directivity. The reflecting mirror group 75 is formed by arranging a plurality of reflecting mirrors in a stepped pattern and integrating them with a mirror base. The reflecting mirror group 75 reduces the beam of light emitted from the blue laser diode 71 in one direction and outputs it toward the first dichroic mirror 141.

[0024] A blower 93 with a built-in fan is disposed between the heat sink 920 and the rear panel 13, and the blue laser diode 71 is cooled by a cooling device 90 (see FIG. 3) including the blower 93 and the heat sink 920. Furthermore, a blower 93 is disposed between the reflective mirror group 75 and the rear panel 13, and the reflective mirror group 75 and the like are cooled by this blower 93.

[0025] Fluorescent wheel device 100 is disposed on the optical path of the excitation light emitted from excitation light irradiating device 70, near front panel 12. Fluorescent wheel device 100 includes phosphor wheel 101, motor 110, condenser lens group 111, and condenser lens 115.

[0026] The phosphor wheel 101 is disposed so as to be substantially parallel to the front panel 12, that is, so as to be perpendicular to the optical axis of the light emitted from the excitation light irradiating device 70. A motor 110 drives and rotates the phosphor wheel 101. A condensing lens group 111 condenses the excitation light emitted from the excitation light irradiating device 70 onto the phosphor wheel 101, and also condenses the fluorescent light emitted from the phosphor wheel 101 toward the rear panel 13. A condensing lens 115 condenses the fluorescent light emitted from the phosphor wheel 101 toward the front panel 12. A blower 93 is disposed on the front panel 12 side of the motor 110, and this blower 93 cools the fluorescent wheel device 100 and the like.

[0027] The phosphor wheel 101 is formed in a substantially disk shape. The central axis of the phosphor wheel 101 is fixed to the shaft portion of the motor 110. The base material of the phosphor wheel 101 can be formed from a metal such as copper or aluminum. The surface of the base material on the excitation light irradiation device 70 side is mirror-finished by silver deposition or the like. Near the outer periphery of the phosphor wheel 101, on the excitation light incident side, a fluorescent light-emitting region and a transmission region that emit green wavelength band light are arranged side by side in the circumferential direction. The fluorescent light-emitting region and the transmission region are each formed in an arc shape at a predetermined angle.

[0028] The phosphor layer of the fluorescence-emitting region is formed on the mirror-finished surface of phosphor wheel 101. When this phosphor layer is irradiated with blue wavelength band light emitted from excitation light irradiation device 70, it emits green wavelength band light as fluorescent light toward condenser lens group 111. The transmission region is formed, for example, by fitting a translucent substrate into a notch formed on the outer periphery of the substrate of phosphor wheel 101. When irradiated with blue wavelength band light emitted from excitation light irradiation device 70, the transmission region transmits or diffuses and transmits the blue wavelength band light from the front side of phosphor wheel 101 toward condenser lens 115 on the back side.

[0029] The red light source device 120 is provided with a red light source 121 arranged so that its optical axis is parallel to that of the blue laser diode 71, and a condenser lens group 125 that condenses the light emitted from the red light source 121. The red light source 121 is a light-emitting diode, which is a semiconductor light-emitting element that emits light in the red wavelength band. The red light source device 120 is arranged so that the optical axis of the red wavelength band light emitted by the red light source device 120 intersects with the optical axis of the green wavelength band light emitted from the phosphor wheel 101. The red light source device 120 also includes a heat sink 920 on the right panel 14 side of the red light source 121. A blower 93 is arranged between the heat sink 920 and the front panel 12. The red light source 121 is cooled by a cooling device 90 (see FIG. 3 ) that includes the blower 93 and the heat sink 920.

[0030] The light guide optical system 140 is made up of dichroic mirrors (first dichroic mirror 141, second dichroic mirror 148), a reflecting mirror 145 that converts the optical axes of light beams of each color wavelength band to the same optical axis, and condenser lenses 146, 147, and 149 that condense light beams of each color wavelength band. Each component will be described below.

[0031] The first dichroic mirror 141 is disposed at a position between the reflecting mirror group 75 and the condenser lens group 111. The first dichroic mirror 141 reflects the green wavelength band light emitted from the phosphor wheel 101 side and guides it toward the condenser lens 149 side. The first dichroic mirror 141 also transmits the blue wavelength band light and the red wavelength band light. The red wavelength band light emitted by the red light source 121 transmits through the first dichroic mirror 141, and the green wavelength band light emitted by the phosphor wheel 101 is reflected by the first dichroic mirror 141, so that the red wavelength band light and the green wavelength band light follow the same optical path toward the left panel 15.

[0032] The optical axis of the blue wavelength band light reflected by reflecting mirror 143 is converted by 90 degrees toward left panel 15. A condensing lens 146 is arranged on the left panel 15 side of reflecting mirror 143. A reflecting mirror 145 is arranged further toward left panel 15 from condensing lens 146. Reflecting mirror 145 converts the optical axis of the blue wavelength band light that has been guided by reflecting mirror 143 and converted by condensing lens 146 by 90 degrees toward rear panel 13.

[0033] The condenser lens 147 is disposed on the rear panel 13 side of the reflecting mirror 145. The second dichroic mirror 148 is disposed on the left panel 15 side of the condenser lens 149, on the rear panel 13 side of the condenser lens 147. The second dichroic mirror 148 reflects light in the green wavelength band and light in the red wavelength band, and transmits light in the blue wavelength band.

[0034] The blue wavelength band light collected by the collecting lens 147 passes through the second dichroic mirror 148 and is collected by the collecting lens 173 of the light source side optical system 170 .

[0035] Furthermore, the condenser lens 149 is disposed on the left panel 15 side of the first dichroic mirror 141. The green wavelength band light and the red wavelength band light guided by the first dichroic mirror 141 are incident on the condenser lens 149. The green wavelength band light and the red wavelength band light that are incident on and collected by the condenser lens 149 are reflected by the second dichroic mirror 148 and collected by the condenser lens 173 of the light-source-side optical system 170. In this way, the blue wavelength band light, the green wavelength band light, and the red wavelength band light are guided to the light-source-side optical system 170.

[0036] The light source side optical system 170 is composed of a condenser lens 173, a light guiding device 175, a condenser lens 178, an optical axis conversion mirror 181, a condenser lens 183, an irradiation mirror 185, a condenser lens 195, etc. In this embodiment, a case where a light tunnel is used as the light guiding device 175 is illustrated, but a microlens array may also be used. Note that the condenser lens 195 emits image light emitted from the display element 51 arranged on the rear panel 13 side of the condenser lens 195 toward the projection optical system 220, and is therefore also a part of the projection optical system 220.

[0037] The condenser lens 173 is disposed near the entrance of the light guide device 175 and condenses the light source light. The light of each color wavelength band condensed by the condenser lens 173 is emitted toward the light guide device 175.

[0038] The optical axis conversion mirror 181 is disposed behind the condenser lens 178, on the optical axis of the light guiding device 175 on the rear panel 13 side. The light beam emitted from the exit port of the light guiding device 175 is condensed by the condenser lens 178, and then the optical axis is converted by the optical axis conversion mirror 181 toward the left panel 15 side.

[0039] The light beam reflected by the optical axis conversion mirror 181 is collected by the collecting lens 183, and then irradiated at a predetermined angle by the irradiation mirror 185 via the condenser lens 195 onto the display element 51. In this embodiment, a DMD is used as the display element 51. The display element 51 is cooled by a heat sink 920 provided on the rear panel 13 side.

[0040] A bundle of rays, which is light source light irradiated onto the image forming surface of the display element 51 by the light source side optical system 170, is reflected by the image forming surface of the display element 51 and projected as projection light onto a screen via the projection optical system 220. Here, the projection optical system 220 is composed of a condenser lens 195, a movable lens group 235, a fixed lens group 225, etc. The movable lens group 235 is formed so as to be movable by a lens motor. The movable lens group 235 and the fixed lens group 225 are built into a fixed lens barrel. Therefore, the fixed lens barrel equipped with the movable lens group 235 is a variable focus lens, and is formed so as to be able to adjust zoom and focus.

[0041] By configuring the projection device 10 in this manner, when the phosphor wheel 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at appropriate timing, light of each of the blue, green, and red wavelength bands is incident on the display element 51 via the light-guiding optical system 140 and the light-source-side optical system 170. Therefore, the DMD, which is the display element 51 of the projection device 10, displays light of each color in a time-division manner according to data, thereby projecting a color image onto the screen.

[0042] Next, a cooling device 90 of this embodiment will be described with reference to FIGS. 3 to 5. FIG. 3 is a perspective view schematically illustrating the cooling device 90. The cooling device 90 includes a heat-source-side heat transfer member 91, a heat sink 920, and a blower 93 that sends air L (cooling fluid) to the heat sink 920. The heat sink 920 and the blower 93 provided near the excitation light irradiation device 70, the red light source device 120, the fluorescent wheel device 100, and the display element 51 in the projection device 10 of FIG. 2 can be configured similarly to the heat sink 920 and the blower 93 of the cooling device 90 of FIG. 3. Note that cooling devices having the same configuration as the cooling device 90 may be arranged corresponding to some or all of the excitation light irradiation device 70, the red light source device 120, the fluorescent wheel device 100, and the display element 51.

[0043] The heat transfer member 91 and the heat sink 920 are connected by heat pipes 94 (a first heat pipe 94A and a second heat pipe 94B). The heat pipes 94 are heat-generating members connected to the heat source side when viewed from the heat sink 920 side.

[0044] The heat transfer member 91 is formed in a substantially rectangular plate shape and has linear grooves 911 recessed in a concave arc shape on one side. Two grooves 911 are provided in parallel and can engage with the heat pipes 94 formed in a cylindrical rod shape. The grooves 911 can be connected by brazing the side surfaces of the heat pipes 94. The heat transfer member 91 is directly or indirectly thermally connected to the light source elements (including the blue laser diode 71, red light source 121, and phosphor wheel 101 in this embodiment), which are the heat sources, by, for example, being fixed to a holder that holds the light source elements.

[0045] The heat sink 920 has a plurality of fins 92 to which a first heat pipe 94A (first heat generating member) and a second heat pipe 94B (second heat generating member) are connected. The fins 92, which are heat dissipation members, are thermally connected to the light source element, which is a heat source, via the first heat pipe 94A and the second heat pipe 94B.

[0046] As shown in FIG. 4 , the fin 92 is formed from a rectangular metal sheet approximately 0.3 mm thick. The fin 92 has an upper plate portion 922a and a lower plate portion 922b, each of which has opposite edges bent toward one side. A rectangular, flat-plate-shaped main body portion 921, which accounts for the majority of the fin 92, is provided with a circular through-hole 923 and a rectifying member 924. A first heat pipe 94A and a second heat pipe 94B are inserted into the through-hole 923 and secured by brazing. The rectifying member 924 is formed by cutting a portion of the inner region of the main body portion 921 of the fin 92 and bending a cantilevered, short, plate-shaped tongue portion. The rectifying member 924 is provided at approximately the same height as the upper plate portion 922a and the lower plate portion 922b in the same protruding direction. The rectifying member 924 is formed as a long, rectangular, flat plate protruding from the plate surface of the main body portion 921. The upper plate portion 922 a, the lower plate portion 922 b, and the flow regulating member 924 are disposed substantially perpendicular to the main body portion 921 .

[0047] 5, the through-holes 923 are provided at two locations in a direction parallel to the extension direction of the upper plate portion 922a and the lower plate portion 922b (the direction of the flow path axis P1 of the flow path P). Accordingly, the first heat pipe 94A and the second heat pipe 94B are also arranged side by side at two locations in a direction parallel to the extension direction of the upper plate portion 922a and the lower plate portion 922b (the direction of the flow path axis P1 of the flow path P). The multiple fins 92 are arranged side by side in the plate thickness direction of the fins 92 (the depth direction in FIG. 5). The first heat pipe 94A and the second heat pipe 94B are commonly inserted through the through-hole 923 of each fin 92, and the fins 92 are connected to each other. 4, a tip 922a1 of an upper plate portion 922a of a fin 92 abuts or is adjacent to a base end 922a2 (in other words, an end of a main body portion 921) of the upper plate portion 922a of an adjacent fin 92 (see the enlarged view of portion A in FIG. 3). A tip of a lower plate portion 922b of a fin 92 also abuts or is adjacent to a base end (in other words, an end of a main body portion 921) of the lower plate portion 922b of an adjacent fin 92 (details not shown). In addition, a tip of a rectifying member 924 also abuts or is adjacent to a base end of the rectifying member of an adjacent fin 92 (details not shown). Therefore, as shown in the cross-sectional view of FIG. 5, the heat sink 920 is surrounded by the upper plate portion 922a, the lower plate portion 922b, and the opposing main body portion 921 of the fin 92 to form a flow path P, and is configured to include a cylindrical flow path P that opens in the direction of a flow path axis P1 of the flow path P. In the heat sink 920, a plurality of such flow paths P are arranged in parallel in the longitudinal direction of the heat pipe 94.

[0048] The upstream first heat pipe 94A and the downstream second heat pipe 94B shown in FIG. 5 are connected to fins 92 (heat dissipation members) on the inside of the width direction (vertical direction) of the flow path P. A rectifying member 924 is provided in the flow path P and guides air L (cooling fluid) flowing through the flow path P to the second heat pipe 94B. The rectifying member 924 is provided vertically below the first heat pipe 94A and the second heat pipe 94B and is arranged so as to slope upward toward the downstream side along the flow path axis P1. The rectifying member 924 in this embodiment is inclined at 45 degrees with respect to the flow path axis P1. The rectifying member 924 has a guide surface 924a that guides air L (cooling fluid) flowing from upstream in the flow path P upward. The rectifying member 924 is provided upstream of the second heat pipe 94B in the flow path P. A portion of the rectifying member 924 is located below the first heat pipe 94A. Another part of the rectifying member 924 is located below and between the first heat pipe 94A and the second heat pipe 94B.

[0049] The blower 93 has a case 931 and a fan 932. Note that the fan 932 is shown schematically in FIG. 5. The blower 93 has air intakes 931a and 931b on the top and bottom surfaces of the case 931, and has a fan 932 inside corresponding to the air intakes 931a and 931b. In this embodiment, a sirocco fan is used as the fan 932. The upper air intakes 931a are provided intermittently at three positions around the axis of the fan 932 (see FIG. 3). The lower air intake 931b is formed in a substantially circular shape. The air intakes 931a and 931b are arranged inside the outer diameter of the fan 932.

[0050] Here, we will explain the movement of air in the cooling device 90. When the fan 932 of the blower 93 is driven to rotate, a negative pressure is generated such that air is taken in through the air intakes 931a and 931b, and air is taken in from outside the projection device 10 through air intakes (details not shown) provided at any location on the exterior case (including the front panel 12, the rear panel 13, the right panel 14, and the left panel 15) of the projection device 10 shown in Fig. 2. The blower 93 takes in the air taken in from outside the projection device 10 through the air intakes 931a and 931b, and sends it toward the heat sink 920 by the fan 932.

[0051] Of the air L sent toward the heat sink 920, part of the air L1 entering from below passes below the rectifying member 924, and another part of the air L1 is guided upward in the flow path P by the guide surface 924a of the rectifying member 924. Of the air L sent toward the heat sink 920, part of the air L2 entering from above hits the first heat pipe 94A and passes above the first heat pipe 94A, and another part of the air L2 is sent to the first heat pipe 94A and passes below the first heat pipe 94A. The air L21 that passes below the first heat pipe 94A is pushed up by part of the air L11 flowing on the lower side and guided upward by the rectifying member 924, and is guided to be sent to the second heat pipe 94B located downstream of the first heat pipe 94A.

[0052] 5, air L21 is sent to the second heat pipe 94B and then passes above the second heat pipe 94B. Meanwhile, air L11 guided by the rectifying member 924 is also pushed upward, sent to the second heat pipe 94B, and then passes below the second heat pipe 94B. Thereafter, the entire air L passing through the flow path P is exhausted from the opening on the downstream side of the heat sink 920.

[0053] In the cooling device 90, heat transferred from the heat source side via the first heat pipe 94A and the second heat pipe 94B is transferred from above the fins 92 to the entire main body 921. Furthermore, because the first heat pipe 94A and the second heat pipe 94B are both connected above the fins 92, the upper side of the fins 92 is hotter than the lower side. Therefore, without the rectifying member 924, the air L2 flowing upward is relatively slow, and the air L2 whose temperature has increased after passing near the first heat pipe 94A mainly flows into the second heat pipe 94B, resulting in a decrease in the heat dissipation efficiency around the second heat pipe 94B.

[0054] The heat pipes 94 (first heat pipe 94A and second heat pipe 94B) can also be provided at the widthwise center side of the flow path P (the vertical center side in FIG. 5 ) relative to the fins 92. In this case, however, depending on the surrounding configuration in which the cooling device 90 is installed, it may be necessary to bend the heat pipes 94. However, the amount of heat that each heat pipe 94 can transport is limited, and bending the heat pipes 94 may reduce the amount of heat that can be transported.

[0055] In the cooling device 90 of this embodiment, a rectifying member 924 is provided below the first heat pipe 94A and the second heat pipe 94B to guide the relatively low-temperature air L1 flowing below toward the second heat pipe 94B while avoiding blowing it toward the first heat pipe 94A (see, for example, the flow path of air L11). Therefore, both the first heat pipe 94A and the second heat pipe 94B can be cooled by the low-temperature air. Even if the first heat pipe 94A and the second heat pipe 94B are connected to positions offset toward one side of the fin 92 (the upper side in this embodiment) due to the surrounding structure of the cooling device 90, the rectifying member 924 guides the flow of air L in the flow path P, allowing the air L to flow at a high flow rate toward the second heat pipe 94B, which is a heat-generating component downstream, thereby efficiently cooling the second heat pipe 94B. Furthermore, in this embodiment, since the air intake ports 931a, 931b are provided above and below the blower device 93, even if sufficient space cannot be secured above and below the cooling device 90, it is possible to reduce the flow resistance on the intake side and prevent a decrease in intake capacity, thereby improving the cooling function.

[0056] It is also possible to provide a plurality of through holes 923 at three or more locations, and to provide a plurality of heat pipes 94 arranged in the through holes 923 at three or more locations. This allows heat to be transported to the heat sink 920 side even when the heat source generates a large amount of heat. Furthermore, the three or more through holes 923 and heat pipes 94 can be arranged in the direction of flow of the cooling fluid. In this case, low-temperature air L is circulated through a portion of the flow path P, and the rectifying member 924 can send the low-temperature air L to any portion of the heat pipe 94, thereby selectively cooling the area around a specific heat pipe 94.

[0057] Furthermore, when heat pipes 94 are provided at three or more locations, a plurality of rectifying members 924 may also be provided corresponding to the downstream heat pipes 94. In this case, the rectifying members 924 may be provided corresponding to each of the downstream heat pipes 94, or may be provided corresponding to some of them. Furthermore, when heat pipes 94 are provided at three or more locations and rectifying members 924 are provided at multiple locations, the length of the upstream rectifying member 924 may be shorter than the length of the downstream rectifying member 924. Furthermore, the rectifying members 924 may be provided along the flow path axis P1 direction, or may be provided in multiple stages (e.g., upper and lower stages) parallel to the flow path axis P1.

[0058] Furthermore, the fins 92, which are heat dissipation members, may be connected to other heat generating members such as solid rod-shaped members, instead of the heat pipes 94, to allow heat transfer from the heat source side.

[0059] Furthermore, the rectifying member 924 is not limited to the configuration shown in this embodiment and may be provided by other methods. For example, the rectifying member may be formed as a long, flat plate separate from the fins 92, and may be disposed in the flow path P by being commonly inserted through slit-shaped openings provided in the plurality of fins 92.

[0060] Furthermore, the blower 93 may have a configuration different from that shown in this embodiment. For example, the fan 932 is not limited to a sirocco fan, and other fans such as an axial fan or a turbo fan may be applied. The intake ports 931a, 931b may be provided in any position and shape depending on the configuration of the fan.

[0061] As described above, the cooling device 90 according to the embodiment of the present invention, and the light source device 60 and projection device 10 equipped with the cooling device 90, include a heat dissipation member (92) that forms a flow path P, a first heat-generating member (94A) and a second heat-generating member (94B) that are connected to the heat dissipation member (92) within the flow path P, and a rectifying member 924 that is provided within the flow path P and guides the cooling fluid (air L) flowing within the flow path P to the second heat-generating member (94B). This allows the rectifying member 924 to guide the air L within the flow path P to a heat-generating part with a high temperature, thereby improving the cooling function of the cooling device 90.

[0062] Furthermore, the first heat-generating member (94A) provided on the upstream side of the flow path P and the second heat-generating member (94B) provided on the downstream side of the flow path P are arranged side by side in the direction of the flow path axis P1 of the flow path P, and the flow straightening member 924 is provided below the first heat-generating member (94A) and the second heat-generating member (94B), and has a guide surface 924a that guides upward the cooling fluid (air L) flowing from upstream in the flow path P. Therefore, the low-temperature air L1 flowing on the lower side can be guided to the high-temperature second heat-generating member (94B) on the downstream side, thereby enabling efficient cooling.

[0063] Furthermore, the cooling device 90 in which the straightening member 924 is inclined and disposed upstream of the second heat-generating member (94B) in the flow path P can guide the air L1 toward the second heat-generating member (94B) without significantly interfering with the flow of the air L1 guided by the straightening member 924.

[0064] In addition, a configuration has been described in which a portion of the rectifying member 924 is located below the first heat generating member (94A) and another portion of the rectifying member 924 is located below and between the first heat generating member (94A) and the second heat generating member (94B). This allows the lower temperature air L1 from below to be blown toward the second heat generating member (94B) together with the air L21 that has circulated near the first heat generating member (94A) while avoiding being guided toward the first heat generating member (94A).

[0065] The heat dissipation members (92) are fins 92 formed from a metal plate on which rectifying members 924 are provided, and the rectifying members 924 are formed by bending parts of the fins 92. This allows the fins 92 to be easily configured, and the heat sink 920 including the rectifying members 924 in the flow path P to be easily configured.

[0066] Also, a configuration has been described in which a heat sink 920 including a cylindrical flow path P that is open in the direction of the flow path axis P1 of the flow path P is provided by a plurality of fins 92 to which a first heat generating member (94A) and a second heat generating member (94B) are connected. The first heat generating member (94A) and the second heat generating member (94B) are heat pipes 94 connected to a heat source. This allows air L to circulate efficiently within the flow path P, and heat can be efficiently dissipated from the fins 92, which are cooling members that surround the flow path P.

[0067] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the inventions and their equivalents as defined in the claims.

[0068] The invention described in the first claim of the present application is as follows: [1] A heat dissipation member that forms a flow path; a first heat generating member and a second heat generating member connected to the heat dissipation member within the flow path; a flow straightening member provided in the flow path and guiding the cooling fluid flowing in the flow path to the second heat-generating member; A cooling device comprising: [2] The first heat generating member provided on the upstream side of the flow path and the second heat generating member provided on the downstream side of the flow path are arranged side by side in a flow path axial direction of the flow path, the flow straightening member is provided below the first heat generating member and the second heat generating member, and has a guide surface that guides the cooling fluid flowing from upstream in the flow path upward. The cooling device according to [1] above. [3] The cooling device according to [1] or [2], wherein the straightening member is provided at an incline upstream of the second heat-generating member in the flow path. [4] A portion of the rectifying member is located below the first heat-generating member, another part of the rectifying member is located below and between the first heat generating member and the second heat generating member; The cooling device according to any one of [1] to [3] above, characterized in that: [5] The heat dissipation member is a fin formed of a metal plate on which the rectifying member is provided, The rectifying member is configured by bending a part of the fin. The cooling device according to any one of [1] to [4] above, characterized in that: [6] A heat sink including a cylindrical flow path that is open in a flow path axial direction of the flow path, with a plurality of fins to which the first heat generating member and the second heat generating member are connected, the first heat generating member and the second heat generating member are heat pipes connected to a heat source side; The cooling device according to [5] above, characterized in that [7] The cooling device according to any one of [1] to [6] above, a light source element that is a heat source thermally connected to the heat dissipation member; A light source device comprising: [8] The light source device according to [7] above, a display element that is irradiated with light from the light source device and forms image light; a projection optical system that projects the image light emitted from the display element onto a screen; a control unit that controls the display element and the light source device; A projection device comprising: [Explanation of symbols]

[0069] 10 Projection device 12 Front panel 13 Rear panel 14 Right side panel 15 Left side panel 21 Input / output connector section 22 Input / output interface 23 Image conversion unit 24 Display Encoder 25 Video RAM 26 Display driver 31 Image compression / expansion unit 32 Memory card 35 IR receiver 36 Ir processing section 37 Key / indicator section 38 control unit 41 light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 51 Display element 60 Light source device 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 75 Reflecting mirror group 80 Green light source device 90 Cooling device 91 heat transfer member 92 fin 93 Blower 94 Heat pipe 94A First heat pipe 94B Second heat pipe 100 Fluorescent wheel device 101 Phosphor wheel 110 motor 111 condenser lens group 115 condenser lens 120 red light source device 121 Red light source 125 Condenser lens group 140 light guide optical system 141 first dichroic mirror 143 Reflective mirror 145 Reflective mirror 146 Condenser Lens 147 Condenser Lens 148 Second dichroic mirror 149 Condenser lens 170 Light source side optical system 173 Condenser lens 175 Light guide device 178 Condenser lens 181 Optical axis conversion mirror 183 Condenser lens 185 Illumination mirror 195 Condenser lens 220 Projection optical system 225 Fixed lens group 235 Movable lens group 241 Control circuit board 911 Groove 920 Heat sink 921 Main body 922a Upper plate 922a1 Tip 922a2 Base end 922b Lower plate part 923 Through hole 924 Straightening member 924a Guide surface 931 case 931a intake 931b Air intake 932 Fan L, L1, L2, L11, L21 Air P flow path P1 Flow path axis SB System bus

Claims

1. a heat dissipation member that forms a flow path; a first heat generating member and a second heat generating member connected to the heat dissipation member within the flow path; a first flow straightening member provided in the flow path and configured to guide the cooling fluid flowing in the flow path to the first heat generating member; and a second flow straightening member configured to guide the cooling fluid to the second heat generating member. a third heat generating member provided upstream of the flow path relative to the first heat generating member; Equipped with a length of the first flow straightening member provided on the upstream side of the flow path is shorter than a length of the second flow straightening member provided on the downstream side of the flow path; A cooling device characterized by:

2. the first heat generating member provided on the upstream side of the flow path and the second heat generating member provided on the downstream side of the flow path are arranged side by side in a flow path axial direction of the flow path, the first and second flow straightening members are provided below the first and second heat generating members, and have guide surfaces that guide the cooling fluid flowing from upstream in the flow path upward.

2. The cooling device according to claim 1.

3. 3. The cooling device according to claim 1, wherein the first flow straightening member and the second flow straightening member are provided so as to incline upward from the upstream side to the downstream side of the flow path.

4. the heat dissipation member is a fin formed of a metal plate on which the first and second flow rectifying members are provided, The first and second flow rectifying members are formed by bending a portion of the fin.

4. The cooling device according to claim 1, wherein the cooling device is a cooling device having a cooling function.

5. a heat sink including a cylindrical flow path that is open in a flow path axial direction of the flow path and includes a plurality of fins to which the first heat generating member and the second heat generating member are connected, the first heat generating member and the second heat generating member are heat pipes connected to a heat source side; 5. The cooling device according to claim 4.

6. A cooling device according to any one of claims 1 to 5; a light source element that is a heat source thermally connected to the heat dissipation member; A light source device comprising:

7. The light source device according to claim 6 ; a display element that is irradiated with light from the light source device and forms image light; a projection optical system that projects the image light emitted from the display element onto a screen; a control unit that controls the display element and the light source device; A projection device comprising:

Images