JP2022053443A - Projection device - Google Patents

Abstract

To suitably cool a projection device with one cooling fan.SOLUTION: A projection device 10 includes an optical device 60, a control circuit board 300 disposed on an upper side of the optical device 60, a cooling fan 280 disposed near a suction part 264, which is a rear surface suction part of a case 250 on the opposite side of a projecting direction, and having an upper surface suction port 280a that sucks from an upper surface and a lower surface suction port 280b that sucks from a lower surface, and heat sinks (first heat sink 281 and second heat sink 282) provided according to a discharge port 280c of the cooling fan 280 and connected to the optical device 60. The flow channel resistance on the lower surface suction port 280b side is lower than the flow channel resistance on the upper surface suction port 280a side.SELECTED DRAWING: Figure 6

Description

The present invention relates to a projection device.

Conventionally, there has been a technology for cooling a light source, a control substrate, etc. provided in a projection device that projects an image formed by using a micromirror display element called a DMD (Digital Micromirror Device) or a liquid crystal plate on a screen. Proposed. For example, the projection device of Patent Document 1 has a partition portion for partitioning a first region including an optical unit including a light source and a transmissive liquid crystal plate and a second region in which a power supply and a control substrate are arranged, and each region. Each is provided with a cooling fan, and outside air is sucked in through a dustproof filter. The second region has less dust resistance than the first region and improves the cooling efficiency of the second region.

Japanese Unexamined Patent Publication No. 2016-80957

When the projection device is desired to have a compact shape, a plurality of heat generating members inside the case of the projection device are densely packed. Then, even if an attempt is made to divide the inside of the compact case by a partition portion as in the conventional case, there is no space for providing the partition portion, the partition portion itself has a complicated shape, and so on. It may be difficult to divide into the areas to be covered. Then, when trying to cool the first region and the second region with one cooling fan for the miniaturization of the projection device, it may be difficult to satisfactorily cool the entire internal parts of the case of the projection device.

An object of the present invention is to satisfactorily cool a projection device with one cooling fan.

The projection device of the present invention is arranged near the optical device, the control circuit board arranged on the upper side of the optical device, and the rear intake portion of the case on the side opposite to the projection direction, and takes in air from the upper surface. A cooling fan having a port, a lower surface intake port for sucking air from the lower surface, and a heat sink provided corresponding to the discharge port of the cooling fan and connected to the optical device are provided, and the lower surface intake port side is provided. The flow path resistance is smaller than the flow path resistance on the upper surface intake port side.

According to the present invention, one cooling fan can satisfactorily cool the projection device.

It is a front side perspective view which shows the appearance of the projection apparatus which concerns on embodiment of this invention. It is a rear side perspective view which shows the appearance of the projection apparatus which concerns on embodiment of this invention. A projection device according to an embodiment of the present invention is shown, (a) is an exploded perspective view seen from above, and (b) is an exploded perspective view seen from below. It is an exploded perspective view which looked at the optical apparatus in the projection apparatus which concerns on embodiment of this invention from the lower side. It is a figure which shows the cooling fan in the projection apparatus which concerns on embodiment of this invention, (a) is a top view, (b) is a bottom view. FIG. 3 is a sectional view taken along line VI-VI of FIG. 1 in which the inside of the optical case in the projection apparatus according to the embodiment of the present invention is omitted and shaded. It is a perspective view which shows the heat sink for the IC chip of the substrate in the projection apparatus which concerns on embodiment of this invention. It is VIII-VIII cross-sectional view of FIG. 1, which shows by omitting the inside of the optical case in the projection apparatus which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line IX-IX of FIG. 1 in which the inside of the optical case in the projection apparatus according to the embodiment of the present invention is omitted and shaded. It is a figure which shows the functional circuit block of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the flow of the cooling air in the projection apparatus which concerns on embodiment of this invention. 11 is a cross-sectional view taken along the line XIII-XIII of FIG. 11 showing a case of a projection device and a power supply circuit board according to an embodiment of the present invention.

Hereinafter, embodiments for carrying out the present invention will be described. As shown in FIGS. 1 and 2, the projection device 10 has a compact shape, and has six outer peripheral surfaces (upper surface 250a, lower surface 250b, left side surface 250c (second side surface), right side surface 250d). (First side surface), front surface 250e, rear surface 250f) (Note that the first side surface and the second side surface face each other), and the case 250 having a substantially long rectangular box shape with the left-right direction as the longitudinal direction is provided. .. The projection device 10 has a projection port 11 on the front surface 250e side. The projection device 10 emits projected light from the projection port 11. In the following description, the left and right sides of the projection device 10 refer to the left and right directions with respect to the projection direction from the projection port 11, and the front and back directions refer to the front and back directions with respect to the traveling direction of the projected light of the projection device 10. show.

The case 250 has an upper case 251 and a lower case 252, a left panel 253, a front panel 254, and a rear panel 255. As shown in FIGS. 3A and 3B, the upper case 251 has an upper panel portion 251a provided with an upper surface 250a and an upper right panel portion 251b provided with a surface to be a part of the upper side of the right side surface 250d. .. The lower case 252 has a lower panel portion 252a having a lower surface 250b and a lower right panel portion 252b having a surface that becomes a part of the lower side of the right side surface 250d. The connection portion between the upper panel portion 251a and the upper right panel portion 251b and the connection portion between the lower panel portion 252a and the lower right panel portion 252b are curved in an R shape. The left panel 253, the front panel 254, and the rear panel 255 are outer peripheral plates together with the upper panel portion 251a of the upper case 251, the upper right panel portion 251b, the lower panel portion 252a of the lower case 252, and the lower right panel portion 252b.

A power plug 15 is provided on the lower rear side of the right side surface 250d (the rear side of the lower right panel portion 252b). The lower case 252 is manufactured by die casting using a metal material such as a magnesium alloy or an aluminum alloy. The upper case 251 and the front / rear and left panels are molded from a resin material.

A projection image adjusting unit 12 having one or a plurality of rotary knobs is provided on the upper surface of the upper case 251 corresponding to the projection port 11. By operating the rotary knob of the projection image adjustment unit 12, the position of the operating lens of the projection optical system is adjusted, and the size and focus of the projection image are adjusted. Further, a key / indicator portion 37 is provided on the upper surface on the rear side of the upper case 251. The key / indicator unit 37 includes a power switch key, a power indicator for notifying power on / off, a projection switch key for switching projection on / off, an optical device 60, a display element 51 (described later in FIG. 11), or a control circuit. Keys and indicators for making various settings such as an overheat indicator that notifies when the device overheats are arranged.

The front panel 254, which is long in the left-right direction, extends to the left front corner portion 250 g of the case 250, and the left front corner portion 250 g is formed into an R-shaped corner. Similarly, the rear panel 255, which is long in the left-right direction, extends to the left rear corner portion 250h of the case 250, and the left rear corner portion 250h has an R-shaped corner. The left panel 253 is provided between the front panel 254 extending to the left front corner 250 g and the rear panel 255 extending to the left rear corner 250 h.

The left side panel 253, the front side panel 254, and the rear side panel 255 are provided with horizontal ribs 256 over the respective panels at substantially the center in the vertical direction. The upper side and the lower side of the horizontal rib 256 in each panel are formed in a substantially horizontally long grid pattern. The left side panel 253, the front side panel 254, and the rear side panel 255 have the horizontal rib 256 as the top, and the upper side and the lower side of the horizontal rib 256 are inclined toward the inner side of the case 250.

In the region extending from the substantially central portion to the rear side of the left panel 253, an intake portion 261 having a plurality of narrow horizontally elongated intake holes in a horizontally long grid pattern is provided. The intake unit 261 is provided with a plurality of narrow horizontally long intake holes along a substantially horizontally long grid pattern. On the front side of the left panel 253, a speaker portion 48a in which a part of the horizontally long grid is opened is provided. A speaker 48 is provided inside the speaker unit 48a. An input / output connector portion 21 for image signals is provided on the rear side of the left panel 253.

In the front panel 254, the predetermined area on the right end side is the exhaust unit 260, and the predetermined area in the substantially central portion is the intake unit 262. The intake unit 262 includes a right side intake unit 262a and a left side intake unit 262b. The front panel 254 is provided with a projection port opening 254a facing the projection port 11 in the vicinity of the left front corner portion 250 g. The right front corner portion 250i to which the front panel 254 and the upper right panel portion 251b and the lower right panel portion 252b of the right side surface 250d are connected is formed to have a right angle in a plan view.

The exhaust portion 260 is provided with inclined ribs 254b on the upper side and the lower side in the radial direction from the right end of the lateral rib 256, respectively. Further, the exhaust portion 260 is provided with two vertical ribs 254c on the upper side and the lower side of the horizontal rib 256 at predetermined intervals closer to the center than the inclined ribs 254b. The exhaust portion 260 is provided with double horizontally long U-shaped ribs 254d over the inclined ribs 254b and the vertical ribs 254c. The exhaust portion 260 has a larger hole than the intake portions 261,262,263,264.

As shown in FIG. 11, the inclined ribs 254b and the vertical ribs 254c are provided so as to be inclined so that the exhaust direction is to the right. The regions other than the exhaust portion 260 and the projection port opening 254a of the front panel 254 are formed in a substantially horizontally long grid pattern.

The rear panel 255 is provided with an output plug 14 to an audio device on the upper left side. The right end side of the rear panel 255 is a substantially U-shaped grid that imitates the horizontally long grid of other parts. From the left side of the rear panel 255 to the substantially central portion, an intake portion 263 provided with a horizontally elongated intake hole having a horizontally long grid pattern is provided. On the right side portion of the rear panel 255, an intake portion 264 (rear intake portion) similarly provided with an intake hole (a narrow horizontally long intake hole and a substantially U-shaped thin intake hole) is provided. The right rear corner portion 250j to which the rear side panel 255, the upper right panel portion 251b of the right side surface 250d, and the lower right panel portion 252b are connected is formed to have a right-angled shape in a plan view.

In this way, the projection device 10 includes an intake / exhaust unit including an intake unit 261 to 264 having a plurality of intake holes and exhaust holes and an exhaust unit 260. In other words, the intake / exhaust portion of the projection device 10 has a plurality of intake / exhaust holes.

Next, the storage form of the case 250 of the projection device 10 will be described. As shown in FIGS. 3A and 3B, the case 250 of the projection device 10 houses an optical case 61, a control circuit board 300, a cooling fan 280, a first heat sink 281 and a second heat sink 282. The optical case 61 is arranged with various light sources of the optical device 60 and optical members such as lenses and mirrors, and a lens barrel 225 is attached to the optical case 61.

As shown in FIGS. 3B and 4, the optical case 61 is provided with an opening 61a on the lower side (the lower surface 250b side of the case 250, the lower side in the thickness direction of the case 250). A cover member 62 is fixed to the opening 61a together with a seal member (not shown) by a plurality of bolts to prevent dust. The sealing member is arranged along the edge of the opening 61a. The opening 61a is covered with a cover member 62, and the inside of the optical case 61 is a closed space. When manufacturing the optical device 60, an optical member such as a lens or a mirror or a light source is attached to the inside of the optical case 61 through the opening 61a. Here, FIG. 4 shows an exploded perspective seen from below by omitting an optical member such as a condenser lens housed inside the optical case 61.

The fluorescent plate device 100, which will be described later, is partially covered with a cover 65 so as to project through an opening on the upper surface of the optical case 61. The mounting range of the cover 65 is limited as compared with the cover member 62, and the mounting range of the cover 65 is small. Therefore, it is easy to take dustproof measures such as a sealing member for the opening covered by the cover 65.

As shown in FIG. 3A, a control circuit board 300 serving as a main board is provided on the upper surface side of the optical case 61. The control circuit board 300 is fixedly arranged on the upper side of the case 250 by being screwed to a boss or a bracket standing upright from the upper surface of the optical case 61 or the inner side surface of the lower panel portion 252a of the lower case 252. .. As shown in FIG. 11, a blower-type cooling fan 280 using a sirocco fan is located behind the right side of the optical case 61 (in other words, in the vicinity of the intake portion 264 of the case 250 on the opposite side of the projection direction). Be placed. The projection device 10 is provided with only one cooling fan 280, and is not provided with a plurality of cooling fans 280.

As shown in FIG. 5A, an upper surface intake port 280a for sucking air from the upper surface of the cooling fan 280 is provided on the upper surface of the cooling fan 280. The upper surface intake port 280a is composed of three substantially arcuate openings. On the other hand, a lower surface intake port 280b is provided on the lower surface of the cooling fan 280. The lower surface intake port 280b consists of one circular opening. The area of the lower surface intake port 280b is larger than the area of the upper surface intake port 280a (the total area of the three substantially arcuate openings). The cooling fan 280 is taken in from the upper surface intake port 280a and the lower surface intake port 280b, and is exhausted from the discharge port 280c whose opening direction is orthogonal to the opening direction of the upper surface intake port 280a and the lower surface intake port 280b.

Further, as shown in FIG. 6, the cooling fan 280 is provided in the vicinity of the right side surface 250d (upper right panel portion 251b and lower right panel portion 252b). Here, the right side surface 250d is not provided with intake / exhaust holes, and outside air is not taken in from the right side surface 250d. Further, the cooling fan 280 is arranged on the upper side of the case 250 in the thickness direction. That is, the space below the cooling fan 280 in the case 250 (lower space Y surrounded by a two-dot chain line and hatched inside) is the space above the cooling fan 280 in the case 250 (two-dot chain line). It is wider than the upper space X) surrounded by and hatched inside. Therefore, the flow path resistance on the lower surface intake port 280b side is smaller than the flow path resistance on the upper surface intake port 280a side. In FIG. 6, members such as a condenser lens and a mirror inside the optical device 60 are omitted, and the inside is shaded.

Returning to FIG. 3A, heat sinks (first heat sink 181 and second heat sink 282) connected to the optical device 60 are provided on the front side of the cooling fan 280 corresponding to the discharge port 280c of the cooling fan 280. .. Specifically, a second heat sink 282 is provided on the front side of the discharge port 280c of the cooling fan 280, and a first heat sink 281 is provided on the front side of the second heat sink 282. A power supply circuit board 310 (see FIG. 6) is arranged directly below the cooling fan 280 (between the cooling fan 280 and the lower case 252, that is, the lower space Y). Further, a third heat sink 283 connected to the optical device 60 is provided on the substantially central rear side of the optical case 61. The third heat sink 283 has a plurality of fins. A concave grip portion 270 is provided at the front center portion of the lower surface 250b of the lower case 252.

An IC heat sink 285 for cooling the IC chip 301 provided on the lower surface of the control circuit board 300 is attached to the control circuit board 300 at the left end on the front side. As shown in FIG. 7, the IC heat sink 285 is composed of a sheet metal member, and has a contact plate 285a arranged in a flat plate shape so as to abut on the IC chip 301 and a comb extending vertically downward from the contact plate 285a. It has a tooth-shaped first fin 285b and a second fin 285c that is adjacent to the first fin 285b in a direction perpendicular to the first fin and is inclined inward. The IC heat sink 285 is attached to the corner of the optical case 61 with the first fin 285b facing the front surface 250e. Therefore, the first fin 285b and the second fin 285c are arranged along the outer circumference of the optical case 61.

As shown in FIGS. 8 and 9, a gap is provided between the case 250 of the projection device 10 and the optical case 61 (optical device 60). Then, a region including a gap between the upper surface of the optical case 61 (optical device 60) and the lower surface of the upper panel portion 251a in the upper case 251 of the case 250 (the upper region surrounded by the two-dot chain line hatched inside). ) Is the first air flow passage 91 through which the cooling air flows. Further, a region (inside hatching) including a gap between the lower surface of the optical case 61 (optical device 60) (lower surface of the cover member 62) and the upper surface of the lower panel portion 252a in the lower case 252 of the case 250 is provided. The lower region surrounded by the alternate long and short dash line) is a second air flow passage 92 through which cooling air flows. In FIGS. 8 and 9, members such as a condenser lens and a mirror inside the optical device 60 are omitted, and the inside of the enclosed space is shown by shading.

The gap between the optical case 61 and the case 250 in the first air flow passage 91 is larger than the gap between the optical case 61 and the case 250 in the second air flow passage 92. In other words, the cross-sectional area of the vertical cross section of the first air flow passage 91 as shown in the vertical cross section of FIGS. 8 and 9 is larger than the cross section of the vertical cross section of the second air flow passage 92. In other words, the first airflow passage 91 is wider than the second airflow passage 92. Therefore, the flow rate of the cooling air in the first air flow passage 91 is larger than the flow rate of the cooling air in the second air flow passage 92. That is, the flow path resistance of the first air flow passage 91 is smaller than the flow path resistance of the second air flow passage 92. Then, the cooling air of the second air flow passage 92 flows through the cover member 62 side of the optical case 61.

FIG. 10 is a functional circuit block diagram of the 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 drive unit 26. The image signals of various standards input from the input / output connector unit 21 are converted into an image signal of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus SB. After that, it is output to the display encoder 24.

Further, the display encoder 24 expands 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 drive unit 26.

The display drive unit 26 drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. The projection device 10 irradiates the display element 51 with a bundle of light rays emitted from the optical device 60 via the light guide optical system to form an optical image with the reflected light of the display element 51, and the projection side optical system 220. The image is projected and displayed on a projected object such as a screen (not shown). The movable lens group 235 of the projection side optical system 220 can be driven by the lens motor 45 for zoom adjustment and focus adjustment.

Further, the image compression / decompression unit 31 performs a recording process of compressing the luminance signal and the color difference signal of the image signal by processing such as ADCT and Huffman coding and sequentially writing them to the memory card 32 which is a detachable recording medium. Further, the image compression / decompression unit 31 reads out the image data recorded in the memory card 32 in the reproduction mode, decompresses the individual image data constituting the series of moving images in units of one frame, and decompresses the individual image data in units of one frame, via the image conversion unit 23. Output to the display encoder 24. Therefore, the image compression / decompression unit 31 can output a moving image or the like based on the image data stored in the memory card 32.

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

The key / indicator unit 37 is composed of a main key, an indicator, and the like provided in the housing. The operation signal of the key / indicator unit 37 is sent directly to the control unit 38. Further, the key operation signal from the remote controller is received by the Ir receiving unit 35, demodulated into a code signal by the Ir processing unit 36, and output to the control unit 38.

The control unit 38 is connected to the voice processing unit 47 via the system bus SB. The voice processing unit 47 includes a sound source circuit such as a PCM sound source, converts voice data into analog in the projection mode and the reproduction mode, and drives the speaker 48 to emit loud sound.

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 of the optical device 60 so that light in a predetermined wavelength band required at the time of image generation is emitted from the optical device 60.

Further, the control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature by a plurality of temperature sensors provided in the optical device 60 or the like, and controls the rotation speed of the cooling fan 280 from the result of the temperature detection. Further, the control unit 38 maintains the rotation of the cooling fan 280 even after the power of the projection device 10 is turned off by a timer or the like in the cooling fan drive control circuit 43, or the projection device 10 main body depends on the result of temperature detection by the temperature sensor. It also controls such as turning off the power of.

Next, the internal structure of the optical device 60 will be described with reference to FIG. Note that FIG. 11 shows the first heat sink 281 and the second heat sink 282 in cross section so that the plurality of fins of the first heat sink 281 and the second heat sink 282 appear.

The optical device 60 is a red light source device 120 which is a light source of red wavelength band light, a green light source device 80 which is a light source of green wavelength band light, a blue light source device which is a light source of blue wavelength band light, and an excitation light source. A certain excitation light irradiation device 70 is provided. The green light source device 80 is composed of an excitation light irradiation device 70 and a fluorescent plate device 100. The optical device 60 has a light guide optical system 140. The light guide optical system 140 combines the light bundles of the green wavelength band light, the blue wavelength band light, and the red wavelength band light, and guides the light bundles of each color wavelength band on the same optical path.

The excitation light irradiation device 70 is arranged on the right rear side of the optical case 61. The excitation light irradiation device 70 includes a plurality of semiconductor light emitting elements arranged so that the optical axis is parallel to the rear panel 255. The semiconductor light emitting device of this embodiment is a plurality of blue laser diodes 71 that emit blue wavelength band light. A collimator lens 73 that enhances the directivity of the light emitted from the blue laser diode 71 and converts it into parallel light is integrally attached to each blue laser diode 71. These blue laser diodes 71 are fixed to the holding plate 74. The holding plate 74 is provided with a total of eight blue laser diodes 71 in 2 rows and 4 columns.

Further, the excitation light irradiation device 70 includes a reflection mirror group 76, a condenser lens 77, and a diffuser plate 78. The reflection mirror group 76 converts the optical axis of the light emitted from each blue laser diode 71 emitted from the right side to the left side by approximately 90 degrees from the rear side to the front side, that is, toward the condenser lens 77. The diffuser plate 78 arranged on the front side of the condenser lens 77 diffuses the light emitted from each blue laser diode 71 reflected by the reflection mirror group 76 and condensed by the condenser lens 77 at a predetermined diffusion angle. do.

The excitation light irradiation device 70 is connected to the heat pipe 79 on the back surface side of the holding plate 74. The heat pipe 79 is connected to the first heat sink 281. The plurality of blue laser diodes 71, which are lasers, are cooled by the first heat sink 281. The tips of the plurality of fins 281a on the left side of the first heat sink 281 are inclined like the inclined ribs 254b and the vertical ribs 254c in the exhaust portion 260.

The red light source device 120 is provided on the front side of the excitation light irradiation device 70 in the optical case 61. The red light source device 120 includes a red light source 121 arranged so that the light bundle of the blue laser diode 71 and the optical axis are parallel to each other, and a condenser lens group 125 that collects the light emitted from the red light source 121. .. The red light source 121 is a red light emitting diode which is a semiconductor light emitting device that emits red wavelength band light. 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 the optical axis of the green wavelength band light emitted from the fluorescent plate 101. The back side of the red light source device 120 is connected to the heat pipe 129. The heat pipe 129 is connected to the second heat sink 282. The red light source 121, which is a light emitting diode, is cooled by the second heat sink 282.

The fluorescent plate device 100 constituting the green light source device 80 includes a fluorescent plate 101, a motor 110, and a condenser lens group 117 on the incident side. The fluorescent plate 101 is a fluorescent wheel arranged so as to be orthogonal to the optical axis of the light emitted from the excitation light irradiation device 70. The fluorescent plate 101 is rotationally driven by a motor 110. The condenser lens group 117 concentrates the light bundle of the excitation light emitted from the excitation light irradiation device 70 on the fluorescent plate 101.

Although not shown, the fluorescence plate 101 has a fluorescence emission region and a diffusion transmission region arranged side by side in the circumferential direction. The fluorescence emission region receives the blue wavelength band light emitted from the blue laser diode 71 as excitation light, and emits fluorescence in the excited green wavelength band. The diffuse transmission region diffuses and transmits the light emitted from the blue laser diode 71. The diffused and transmitted emitted light is emitted as blue wavelength band light of the optical device 60.

The light guide optical system 140 includes a first dichroic mirror 141, a first reflection mirror 143, a condenser lens 146, a second dichroic mirror 148, a condenser lens 149, a second reflection mirror 145, and a condenser lens 147. The first dichroic mirror 141 is located at a position where the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent plate 101 intersect with the red wavelength band light emitted from the red light source device 120. Is placed in. The first dichroic mirror 141 transmits blue wavelength band light and red wavelength band light, and reflects green wavelength band light. The optical axis of the green wavelength band light reflected by the first dichroic mirror 141 is converted by 90 degrees in the direction of the left panel 253 toward the condenser lens 149. Therefore, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 coincides with the optical axis of the green wavelength band light reflected by the first dichroic mirror 141.

The condenser lens 149 is arranged on the left side of the first dichroic mirror 141. The red wavelength band light transmitted through the first dichroic mirror 141 and the green wavelength band light reflected by the first dichroic mirror 141 are both incident on the condenser lens 149. The second dichroic mirror 148 is located on the left side of the condenser lens 149 and behind the condenser lens 147. The second dichroic mirror 148 reflects the red wavelength band light and the green wavelength band light, and transmits the blue wavelength band light. Therefore, the red wavelength band light and the green wavelength band light collected by the condenser lens 149 are reflected by the second dichroic mirror 148 and converted to the rear side by 90 degrees. A condenser lens 173 is arranged behind the second dichroic mirror 148. The red wavelength band light and the green wavelength band light reflected by the second dichroic mirror 148 are incident on the condenser lens 173.

The first reflection mirror 143 is arranged on the optical axis of the blue wavelength band light transmitted through the fluorescent plate 101. The first reflection mirror 143 reflects the blue wavelength band light and converts the optical axis of the blue wavelength band light by 90 degrees to the left. The condenser lens 146 is arranged on the left side of the first reflection mirror 143. Further, the second reflection mirror 145 is arranged on the left side of the condenser lens 146. The second reflection mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflection mirror 143 and condensed by the condenser lens 146 to the rear side by 90 degrees. The condenser lens 147 is arranged behind the second reflection mirror 145. The blue wavelength band light reflected by the second reflection mirror 145 passes through the second dichroic mirror 148 via the condenser lens 147 and is incident on the condenser lens 173. In this way, the light bundles of the red, green, and blue wavelength band lights guided by the light guide optical system 140 are guided on the same optical path of the light source side optical system 170.

The light source side optical system 170 includes a condenser lens 173, an optical axis conversion mirror 179, a microlens array 175, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 is also a part of the projection side optical system 220 because the image light emitted from the display element 51 arranged on the rear side of the condenser lens 195 is emitted toward the projection side optical system 220. ..

Each light beam bundle emitted from the condenser lens 173 is reflected substantially to the left by the optical axis conversion mirror 179 arranged behind the condenser lens 173. Each ray bundle reflected by the optical axis conversion mirror 179 is made into a ray bundle having a uniform intensity distribution by the microlens array 175, is incident on the irradiation mirror 185 through the condenser lens 183, and is reflected. Each light beam bundle reflected by the irradiation mirror 185 is irradiated to the display element 51 at a predetermined angle via the condenser lens 195. The display element 51 is connected to the heat pipe 59 on the back side. The heat pipe 59 is connected to the third heat sink 283. The display element 51, which is a DMD, is cooled by the third heat sink 283.

The light bundle, which is the light source light applied to 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 onto the screen as projected light via the projection side optical system 220. Will be done. The projection side optical system 220 includes a condenser lens 195 and a lens barrel 225. The lens barrel 225 includes a movable lens group 235 and a fixed lens group.

By configuring the projection device 10 in this way, when the fluorescent plate 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, the red, green, and blue wavelength band optics are guided. It is incident on the condenser lens 173 of the light source side optical system 170 via the optical system 140, and further incident on the display element 51 via the light source side optical system 170. Therefore, the DMD, which is the display element 51 of the projection device 10, displays the light of each color in a time-division manner according to the data, so that the color image can be projected on the screen from the projection port 11.

While the projection device 10 is in use, air is taken into the upper surface intake port 280a and the lower surface intake port 280b of the cooling fan 280 from the front surface 250e, the left side surface 250c, and the rear surface 250f according to the operation of the cooling fan 280, and the first heat sink. It is discharged to the outside from the exhaust unit 260 via 281 and the second heat sink 282. As shown in FIG. 12, the outside air is taken into the cooling fan 280 from the intake units 261,262,263,264. At this time, the outside air from the intake portions 261,262,263 facing the first airflow passage 91 and the second airflow passage 92 has a large cross-sectional area of the flow path (the flow path is wide, the flow path resistance is high). (Small) The flow rate of the outside air flowing through the first air flow passage 91 is large and the flow rate of the outside air flowing through the second air flow passage 92 is small. Therefore, since the amount of outside air flowing through the second air flow passage 92 flowing on the cover member 62 side of the optical case 61 is small, the inside of the optical case 61 is entered through the opening 61a of the optical case 61 covered with the cover member 62. The mixing of dust is reduced.

Further, as described above, the amount of outside air flowing through the second air flow passage 92 is reduced to reduce the mixing of dust into the optical case 61. Therefore, in the projection device 10, the intake units 261 to 264 are used to prevent dust. No filter is provided. This eliminates the need for maintenance such as filter replacement, and does not cause downtime due to filter clogging.

By making the case 250 into a compact shape, the projection device 10 generates heat from the first heat sink 281, the second heat sink 282, the excitation light irradiation device 70, the red light source device 120, the display element 51, the control circuit board 300, and the like. Internal parts including parts are crowded. However, in the projection device 10, the cooling fan 280, the first heat sink 281 and the second heat sink 282 are arranged on the right side surface 250d side, and the intake portions 261 to 264 are on the front surface 250e, the left side surface 250c, and the rear surface 250f other than the right side surface 250d. Is provided, and air can be taken into the inside from these three surfaces to satisfactorily cool the internal parts.

The following is mainly the flow of the cooling air in the first air flow passage 91. The outside air taken in from the left side intake part 262b of the intake part 262 of the front surface 250e of the projection device 10 mainly cools the IC chip 301 (IC heat sink 285), and the right side intake part 262a mainly cools the fluorescent plate device 100. .. Of the outside air taken in from the left side intake unit 262b of the intake unit 262, the IC heat sink 285 is also cooled by the outside air flowing on the side surface of the optical case 61. The cooling air from the intake unit 262 that has cooled the IC chip 301 (IC heat sink 285) and the fluorescent plate device 100 cools the red light source device 120 next.

On the other hand, the outside air taken in from the intake unit 261 of the left side surface 250c of the projection device 10 mainly cools the projection optical system 220. Further, the outside air taken in from the intake unit 263 of the rear surface 250f of the projection device 10 directly cools the third heat sink 283 and the display element 51. Then, the cooling air from the intake unit 261 and the cooling air from the intake unit 263 merge. The combined cooling air further merges with the cooling air from the intake unit 262 that has cooled the IC chip 301 (IC heat sink 285), the fluorescent plate device 100, and the red light source device 120, and cools the excitation light irradiation device 70.

The cooling air flowing through the first air flow passage 91 according to the operation of the cooling fan 280 cools the control circuit board 300 while performing the above cooling. Since the control circuit board 300 is arranged at a substantially central position in the vertical direction in the first air flow passage 91, the cooling air flows substantially evenly on the upper side and the lower side of the control circuit board 300. Further, in the second air flow passage 92, the outside air taken in from each intake unit 261,262,263 flows and cools the entire lower surface of the optical case 61.

The cooling air from the first air flow passage 91 that cooled the excitation light irradiation device 70 is mainly taken into the upper surface intake port 280a of the cooling fan 280, and the cooling air from the second air flow passage 92 is mainly taken into the cooling fan. It is taken into the lower surface intake port 280b of 280. On the other hand, the outside air from the intake portion 264 of the rear surface 250f located on the rear side of the cooling fan 280 is mainly taken into the lower surface intake port 280b of the cooling fan 280. At this time, the power supply circuit board 310 arranged directly under the cooling fan 280 is cooled by the outside air from the intake unit 264. A part of the cooling air from the first air flow passage 91 and the cooling air from the second air flow passage 92 is also used for cooling the power supply circuit board 310.

The cooling air taken in by the cooling fan 280 is discharged from the discharge port 280c of the cooling fan 280. The cooling air discharged from the discharge port 280c cools the second heat sink 282 arranged on the discharge port 280c side, then cools the first heat sink 281 arranged on the front surface 250e side, and goes out from the exhaust unit 260 to the outside. It is released. The exhaust direction from the exhaust portion 260 is inclined in a direction away from the intake direction of the adjacent intake portion 262 by the tip portions of the inclined rib 254b and the vertical rib 254c of the exhaust portion 260 and the fin 281a of the first heat sink 281. ing.

The projection device 10 is exhausted from one exhaust unit 260 arranged on the front surface 250e. Therefore, even in the projection device 10 provided with the blower type cooling fan 280 that requires consideration for exhaust resistance, other devices can be arranged close to each other on the top, bottom, left, right, and rear side of the projection device 10. Therefore, the projection device 10 is easy to use as an embedded device.

In this way, the outside air (cooling air) taken in from the intake units 261,262,263,264 according to the operation of the cooling fan 280 has a relatively low calorific value (IC chip 301, heat sink device 100, red color). The members having a high heat generation amount (excitation light irradiation device 70, power supply circuit board 310, second heat sink 282, first heat sink 281) are gradually cooled from the light source device 120, the display element 51, and the third heat sink 283). Then, in consideration of the amount of heat generated by the member, the excitation light irradiation device 70 is arranged on the leeward side of the red light source device 120, and the first heat sink 281 is arranged on the leeward side of the second heat sink 282.

Here, the front panel 254 includes a partition plate 254e that separates the first heat sink 281 from the first air flow passage 91 and the second air flow passage 92. The partition plate 254e is arranged at the left end of the exhaust unit 260 (that is, the left side of the first heat sink 281). Further, between the right side surface of the first heat sink 281 and the second heat sink 282 and the upper right panel portion 251b of the upper case 251 and the lower right panel portion 252b of the lower case 252, the upper right panel portion 251b and the lower right panel portion 252b. A plurality of vertical rib-shaped closing plates 258 erected from the inner surface of the above are provided. The closing plate 258 reduces the possibility that the air exhausted from the exhaust unit 260 is caught in the right side of the first heat sink 281 and taken into the cooling fan 280.

Further, as shown in FIG. 13, the lower case 252 is provided with a shield wall 252c in close proximity to the intake portion 264. The shield wall 252c is provided integrally with the lower case 252 molded by metal die casting. The shield wall 252c is provided parallel to the rear panel 255. The shield wall 252c has a plurality of distribution holes 252c1. The positions and shapes of the plurality of flow holes 252c1 match those of the intake holes 264a as the intake portions 264 provided on the rear panel 255, respectively. Specifically, both the flow hole 252c1 and the intake hole 264a are narrow horizontally elongated holes, and both overlap each other in front view (when the flat plate-shaped rear panel 255 is viewed from the flat plate side (front-back direction of the projection device 10)). Arranged like this.

Even if the power supply circuit board 310 is arranged in the vicinity of the plurality of intake holes 264a due to the shield wall 252c, static electricity or electromagnetic waves from the outside of the projection device 10 via the intake holes 264a of the intake unit 264 are applied to the power supply circuit board 310. The impact can be reduced. Since the flow holes 252c1 and the intake holes 264a are arranged so as to coincide with each other, the shield wall 252c does not obstruct the inflow of outside air from the intake portion 264.

Although the embodiment of the present invention has been described above, the present invention is not limited to the present embodiment and can be carried out with appropriate modifications. For example, in the present embodiment, the first air flow passage 91 is provided on the upper side of the projection device 10 and the second air flow passage 92 is provided on the lower side. Regardless of this, for example, the opening of the optical case 61 is provided. When the portion 61a is provided on the upper surface side and the cover member 62 is provided on the upper surface side of the optical case 61, the second air flow passage 92 is provided on the upper side of the projection device 10 and the first air flow is provided on the lower side. A road 91 may be provided. Further, the shield wall 252c may be provided separately from the lower case 252. Further, the cooling fan 280 is arranged in front of the first heat sink 281 to cool the air that has cooled the second heat sink 282 and the first heat sink 281 from the first air flow passage 91 and the second air flow passage 92 to the cooling fan 280. The air may be taken in by the cooling fan 280 and the air may be discharged to the outside directly from the cooling fan 280 via the exhaust unit 260.

According to the above embodiment of the present invention, the projection device 10 includes an optical device 60, a control circuit board 300 arranged on the upper side of the optical device 60, and a rear intake portion of a case 250 on the side opposite to the projection direction. A cooling fan 280 having an upper surface intake port 280a for sucking air from the upper surface and a lower surface intake port 280b for sucking air from the lower surface, which is arranged in the vicinity of the intake unit 264, and a discharge port 280c for the cooling fan 280 are provided. The flow path resistance on the lower surface intake port 280b side is smaller than the flow path resistance on the upper surface intake port 280a side.

As a result, the outside air sucked from the intake unit 264 is mainly taken in from the lower surface intake port 280b of the cooling fan 280, and the air that has cooled the control circuit board 300 is taken in from the upper surface intake port 280a, so that one cooling fan 280 can use one cooling fan 280. The projection device 10 can be cooled well.

Further, the lower surface intake port 280b of the cooling fan 280 is larger than the upper surface intake port 280a. As a result, more outside air can be taken in from the intake unit 264 via the lower surface side of the cooling fan 280 having a small flow path resistance.

Further, the cooling fan 280 is arranged on the upper side in the thickness direction of the case 250, and the lower space Y of the cooling fan 280 in the case 250 is wider than the upper space X of the cooling fan 280 in the case 250. This makes it possible to more efficiently take in outside air from the lower side of the cooling fan 280 via the intake unit 264.

Further, the cooling fan 280 is provided in the vicinity of the right side surface 250d which is the first side surface of the case 250, and the front surface 250e and the first side surface where the projection port 11 in the case 250 is provided according to the operation of the cooling fan 280. The outside air is taken into the case 250 from the three surfaces of the left side surface 250c facing the (right side surface 250d) and the rear surface 250f facing the front surface 250e, and the outside air is not taken in from the right side surface 250d. As a result, the entire control circuit board 300 can be cooled satisfactorily.

Even if the intake portion is provided on the right side surface 250d where the cooling fan 280 and the heat sink for the light source (first heat sink 281 and second heat sink 282) are arranged, the amount of air taken in from the other three surfaces is reduced. Therefore, the overall cooling efficiency deteriorates. Therefore, it is desirable that the right side surface 250d of the case 250 is not provided with an intake portion.

Further, if the intake portion is provided on the upper surface 250a of the case 250, it may be possible to cool the excitation light irradiation device 70 provided with the laser light source close to the cooling fan 280, but the other three surfaces are also the same. Since the amount of air taken in from the air is reduced, the overall cooling balance is disturbed and the overall cooling efficiency is deteriorated. Therefore, it is desirable that the upper surface 250a of the case 250 is not provided with an intake portion.

Further, if the intake portion is provided on the lower surface 250b of the case 250, a cooling effect may be expected. However, the lower surface 250b side is closer to the installation surface side of the case 250, and is more susceptible to the user's place of use and usage mode than the upper surface 250a side. For example, if the case 250 is installed on a cushion, there is a risk that air cannot be taken in well inside. In addition, we want to eliminate the internal space as much as possible in order to make the entire product compact. Therefore, in this embodiment, a design is adopted in which almost no space is provided on the lower surface 250b side, and the cover member 62 of the optical device 60 is provided on the lower surface 250b side. Such a design also has an advantage from the viewpoint of dust resistance. From this, it is desirable that the lower surface 250b of the case 250 is not provided with an intake portion.

Further, only one cooling fan 280 is provided in the case 250, and a plurality of cooling fans 280 are not provided. This makes it possible to reduce the size of the projection device 10.

Further, a first heat sink 281 for a laser (blue laser diode 71) and a second heat sink 282 for a light emitting diode (red light source 121) are provided on the cooling fan 280 side of the first heat sink 281. As a result, the cooling air is blown in order from the one with the smallest calorific value to the one with the largest calorific value, so that the cooling efficiency can be further improved.

Further, the control circuit board 300 is arranged in the first air flow passage 91 provided on the upper side of the optical device 60, and the cooling fan 280 passes through the first air flow passage 91 according to the operation of the cooling fan 280. The air taken into the control circuit board 300 cools the control circuit board 300. As a result, the control circuit board 300 including the electronic component having a high heat generation amount can be satisfactorily cooled.

Further, an IC heat sink 285 made of a sheet metal member for cooling the IC chip 301 is arranged in the first air flow passage 91. This makes it possible to satisfactorily cool the IC chip 301 that generates a particularly high calorific value.

Further, the first air flow passage 91 is wider than the second air flow passage 92 provided under the optical device 60, and the flow path resistance of the first air flow passage 91 is the second air flow passage. It is smaller than the flow path resistance of 92. As a result, a sufficient space can be secured in the first air flow passage 91, and equipment having a high heat generation amount can be arranged.

Further, the opening 61a of the optical device 60 is provided on the lower side in the thickness direction of the case 250, and the opening 61a is closed by the cover member 62. As a result, by narrowing the gap between the lower side of the optical device 60 and the bottom plate of the case 250, the amount of air flow, that is, the inflow of dust can be reduced, so that dust can be mixed into the inside of the optical device 60. Can be reduced. Further, it is not necessary to provide a dustproof filter in the intake units 261 to 264.

Further, the case 250 includes an intake / exhaust section including an intake section 262 and an exhaust section 260 on the front surface 250e provided with the projection port 11, and the exhaust direction of the exhaust section 260 is relative to the intake direction of the intake section 262. Tilt in the direction of separation. As a result, it is possible to reduce that the heated air discharged from the exhaust unit 260 arranged on the front surface 250e side is again taken in from the intake unit 262 without providing a separate flow passage such as a duct. Therefore, the intake unit 262 can also be provided on the front surface 250e side.

Further, the case 250 has a metal shield wall 252c having a plurality of flow holes 252c1 overlapping with a plurality of intake holes 264a of the intake unit 264, which are a plurality of intake / exhaust holes of the intake / exhaust unit. As a result, it is possible to reduce an adverse electrical effect on the power supply circuit board 310 arranged in the vicinity of the intake unit 264. It should be noted that such a shield wall 252c can be provided not only in the intake portion 264 but also in the exhaust portion, that is, in the intake / exhaust portion having the intake / exhaust holes.

The embodiments described above are presented as examples, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The inventions described in the first claims of the present application are described below.
[1] Optical equipment and
The control circuit board arranged on the upper side of the optical device and
A cooling fan which is arranged in the vicinity of the rear intake portion of the case on the side opposite to the projection direction and has an upper surface intake port for intake from the upper surface and a lower surface intake port for intake from the lower surface.
A heat sink provided corresponding to the discharge port of the cooling fan and connected to the optical device,
Equipped with
The projection device, characterized in that the flow path resistance on the lower surface intake port side is smaller than the flow path resistance on the upper surface intake port side.
[2] The lower surface intake port is larger than the upper surface intake port.
The projection device according to the above [1].
[3] The cooling fan is arranged on the upper side in the thickness direction of the case.
The space below the cooling fan in the case is wider than the space above the cooling fan in the case.
The projection device according to the above [1] or [2].
[4] The cooling fan is provided in the vicinity of the first side surface of the case.
Depending on the operation of the cooling fan, outside air enters the case from three surfaces: the front surface of the case where the projection port is provided, the second side surface facing the first side surface, and the rear surface facing the front surface. Captured,
Outside air is not taken in from the first side,
The projection device according to any one of [1] to [3].
[5] Only one cooling fan is provided in the case, and a plurality of cooling fans are not provided.
The projection device according to any one of [1] to [4].
[6] The heat sink includes a first heat sink for a laser and a second heat sink for a light emitting diode on the cooling fan side of the first heat sink.
The projection device according to any one of the above [1] to [5].
[7] The control circuit board is arranged in a first air flow passage provided on the upper side of the optical device.
In response to the operation of the cooling fan, the air taken into the cooling fan through the first air flow passage cools the control circuit board.
The projection device according to any one of [1] to [6].
[8] An IC heat sink made of a sheet metal member for cooling an IC chip is arranged in the first air flow passage.
The projection device according to the above [7].
[9] The first air flow passage is wider than the second air flow passage provided under the optical device, and the flow path resistance of the first air flow passage is the second air flow passage. Less than the flow path resistance of
The projection device according to the above [7] or [8].
[10] The opening of the optical device is provided on the lower side in the thickness direction of the case.
The opening is closed by a cover member.
The projection device according to any one of [1] to [9].
[11] The case includes an intake / exhaust portion provided with an intake portion and an exhaust portion on the front surface provided with a projection port.
The exhaust direction of the exhaust portion is inclined in a direction away from the intake direction of the intake portion.
The projection device according to any one of [1] to [10].
[12] The case has a metal shield wall having a plurality of flow holes that overlap with the plurality of intake / exhaust holes of the intake / exhaust portion in a front view.
The projection device according to the above [11].

10 Projection device 11 Projection port 12 Projection image adjustment unit 14 Output plug 15 Power plug 21 Input / output connector unit 22 Input / output interface 23 Image conversion unit 24 Display encoder 25 Video RAM
26 Display drive 31 Image compression / decompression 32 Memory card 35 Ir receiver 36 Ir processing 37 Key / indicator 38 Control 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Voice processing 48 Speaker 48a Speaker Part 51 Display element 59 Heat pipe 60 Optical device 61 Optical case 61a Opening 62 Cover member 65 Cover 70 Excitation light irradiation device 71 Blue laser diode 73 Collimeter lens 74 Holding plate 76 Reflection mirror group 77 Condensing lens 78 Diffusing plate 79 Heat pipe 80 Green light source device 91 First air flow path 92 Second air flow path 100 Fluorescent plate device 101 Fluorescent plate 110 Motor 117 Condensing lens group 120 Red light source device 121 Red light source 125 Condensing lens group 129 Heat guide optical system 141 First dichroic mirror 143 First reflection mirror 145 Second reflection mirror 146 Condensing lens 147 Condensing lens 148 Second dichroic mirror 149 Condensing lens 170 Light source side optical system 173 Condensing lens 175 Microlens array 179 Optical axis conversion mirror 183 Condensing lens 185 Irradiation mirror 195 Condenser lens 220 Projection side optical system 225 Lens lens barrel 235 Movable lens group 250 Case 250a Top side 250b Bottom side 250c Left side (second side) 250d Right side (first side)
250e Front 250f Rear 250g Left front corner 250h Left rear corner 250i Right front corner 250j Right rear corner 251 Upper case 251a Upper panel 251b Upper right panel 252 Lower case 252a Lower panel 252b Lower right panel 252c Shield wall 252c1 Flow hole 253 Left panel 254 Front panel 254a Projection port opening 254b Inclined rib 254c Vertical rib 254d U-shaped rib 254e Partition plate 255 Rear panel 256 Horizontal rib 258 Blocking plate 260 Exhaust section 261 Intake section 262 Intake section 262a Right intake section 262b Left side intake part 263 Intake part 264 Intake part 264a Intake hole 270 Grip part 280 Cooling fan 280a Top intake port 280b Bottom intake port 280c Discharge port 281 1st heat sink 281a Fin 282 2nd heat sink 283 3rd heat sink 285 IC heat sink 285a Plate 285b 1st fin 285c 2nd fin 300 Control circuit board 301 IC chip 310 Power supply circuit board SB system bus

Claims (12)

Optical equipment and
The control circuit board arranged on the upper side of the optical device and
A cooling fan which is arranged in the vicinity of the rear intake portion of the case on the side opposite to the projection direction and has an upper surface intake port for intake from the upper surface and a lower surface intake port for intake from the lower surface.
A heat sink provided corresponding to the discharge port of the cooling fan and connected to the optical device,
Equipped with
The projection device, characterized in that the flow path resistance on the lower surface intake port side is smaller than the flow path resistance on the upper surface intake port side. The lower surface intake port is larger than the upper surface intake port.
The projection device according to claim 1. The cooling fan is arranged on the upper side in the thickness direction of the case.
The space below the cooling fan in the case is wider than the space above the cooling fan in the case.
The projection device according to claim 1 or 2. The cooling fan is provided in the vicinity of the first side surface of the case.
Depending on the operation of the cooling fan, outside air enters the case from three surfaces: the front surface of the case where the projection port is provided, the second side surface facing the first side surface, and the rear surface facing the front surface. Captured,
Outside air is not taken in from the first side,
The projection device according to any one of claims 1 to 3. Only one cooling fan is provided in the case, and a plurality of cooling fans are not provided.
The projection device according to any one of claims 1 to 4. The heat sink includes a first heat sink for a laser and a second heat sink for a light emitting diode on the cooling fan side of the first heat sink.
The projection device according to any one of claims 1 to 5. The control circuit board is arranged in a first air flow passage provided above the optical device.
In response to the operation of the cooling fan, the air taken into the cooling fan through the first air flow passage cools the control circuit board.
The projection device according to any one of claims 1 to 6. An IC heat sink made of a sheet metal member for cooling an IC chip is arranged in the first air flow passage.
The projection device according to claim 7. The first air flow passage is wider than the second air flow passage provided under the optical device, and the flow path resistance of the first air flow passage is the flow path of the second air flow passage. Less than resistance,
The projection device according to claim 7 or 8. The opening of the optical device is provided on the lower side in the thickness direction of the case.
The opening is closed by a cover member.
The projection device according to any one of claims 1 to 9. The case includes an intake / exhaust section having an intake section and an exhaust section on the front surface provided with a projection port.
The exhaust direction of the exhaust portion is inclined in a direction away from the intake direction of the intake portion.
The projection device according to any one of claims 1 to 10. The case has a metal shield wall having a plurality of flow holes that overlap with the plurality of intake / exhaust holes of the intake / exhaust portion in a front view.
The projection device according to claim 11.

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