JP2007148199A - Projector and electrical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of decreasing the temperature of exhaust even though its housing is small. <P>SOLUTION: The projector includes: a light source 63; a light source side optical system 61; a display element 51 that forms a projection image; a projection side optical system 62 that projects a projection image; a cooling fan 110 that cools the light source device 63; and an exhaust temperature decreasing device 114 that decreases the temperature of hot air produced as a result of cooling the light source device 63 by the cooling fan 110; and exhaust holes that expel exhaust from the exhaust temperature decreasing device 114. The exhaust temperature decreasing device 114 has a heat pipe 115 and fins 116, and is disposed through a light source chamber 120 and an air cooling chamber 127. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a device having a heat source in a housing such as a data projector that projects an image based on a video signal or the like.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen.

  This data projector incorporates a compact high-intensity light source such as a metal highland lamp or an ultra-high pressure mercury lamp, and the light from the light source is converted into red, green, and blue light using a red filter, green filter, and blue filter in sequence. The lens is focused on a liquid crystal display element or a micromirror display element called DMD, and a color image is displayed in a screen shape by the amount of light transmitted or reflected by the display element toward the projection port of the projector apparatus. .

  In this micromirror display element, a minute mirror cell is swung by a control signal, the direction of reflected light is controlled, and the light incident on the display element by the illumination side optical system is directed toward the projection lens which is the projection side optical system. The reflected on-state light and the off-state light reflected in the direction of the light absorbing plate are used, and the color image is projected onto the screen by controlling the time during which the red light, green light, and blue light are turned on.

  In such a data projector, a metal highland lamp, an ultrahigh pressure mercury lamp, or the like, which is a light source, has a high temperature and needs to be cooled. Japanese Patent Laid-Open No. 2001-312002 (Patent Document 1) proposes a technique for cooling the temperature of a light source by circulating air in an optical unit of a projector using a heat pipe and a cooling fan. However, when air is circulated inside the optical unit in this way, there is a problem that the internal temperature rises if the lamp is lit for a long time.

In addition, many technologies for cooling the light source by taking in external air have been proposed, but the light source is heated to several hundred to nearly 1000 degrees, and in order to mix the high-temperature exhaust hot air that has cooled these light sources and the outside air. In many cases, a distance from the heat source is required, and it is necessary to increase the thickness of the casing or to increase the size of the casing. In addition, the high-temperature exhaust hot air has a problem of heating the exhaust port and its surroundings.
JP 2001-312002 A

  The present invention has been made in view of the problems of the prior art as described above, and a projector that can reduce the exhaust temperature of high-temperature exhaust air discharged from the light source device to the outside even with a small housing. The purpose is to provide electrical equipment.

  The projector of the present invention generates a projection image by receiving light from the light source device (63), the light source side optical system (61) that transmits light from the light source device (63), and the light source side optical system (61). A display element (51), a projection-side optical system (62) that projects a projection image generated by the display element (51), a cooling fan (110) that cools the light source device (63), and a cooling fan (110) An exhaust temperature reduction device (114) comprising a heat pipe (115) and a plurality of plate-like fins (116) for reducing the temperature of the hot air generated by cooling the light source device (63); A light source chamber (120) for blocking heat from the light source device (63), and exhausting from the light source chamber (63) to the front plate (12) of the projector covering the front surface of the light source chamber (120) Has an exhaust hole (17) for discharging the air to the outside, and further has a blower fan in the vicinity of the light source chamber (63). A part of the temperature reducing device (114) protrudes from the light source chamber (63) and is positioned in the vicinity of the blower fan.

  Further, the fin (116) is processed by bending the plate surface of the fin (116) when it is attached perpendicularly to the longitudinal direction of the heat pipe (115), when it is attached obliquely. There are cases.

  Also, an air cooling chamber (127) is provided in the vicinity of the light source chamber (120), the blower fan (117) is located in the air cooling chamber (127), and the exhaust temperature reducing device (114) includes the air cooling chamber (127) and the light source chamber. (114) may be installed.

  Furthermore, the blower fan is used as an exhaust fan (117) that exhausts the air in the housing through the air cooling chamber (127) to the outside through the exhaust hole of the front plate (12), and before the air is sucked into the air cooling chamber (127). In some cases, an intake fan (118) is discharged from the exhaust hole (17) of the face plate (12).

  According to the present invention, a first heat source and a second heat source that generate less heat than the first heat source are provided in the housing, and the first cooling fan that cools the first heat source, the housing An electric device may be provided with a second cooling fan that cools the inside of the body, and an exhaust temperature reduction device that reduces the temperature of the high-temperature air generated by the first cooling fan cooling the first heat source. . The exhaust temperature reducing device has a part in contact with the exhaust of the first cooling fan and the other part in contact with the exhaust of the second cooling fan.

  According to the present invention, it is possible to provide an electrical apparatus such as a projector that can reduce the exhaust temperature of exhaust air discharged from the light source device to the outside even in a small housing.

  The projector 10 of the best mode for carrying out the invention has a substantially rectangular parallelepiped shape, and receives light from the light source device 63, the light source side optical system 61 that transmits light of the light source device 63, and the light source side optical system 61. Display element 51 that creates an image, projection-side optical system 62 that projects the image created by display element 51, cooling fan 110 that cools light source device 63, and cooling fan 110 that cools the light source device An exhaust temperature reducing device 114 for reducing the temperature of the hot air to be heated, a light source chamber 120 for shielding heat of the light source device 63 from the optical system, an air cooling chamber 127 located in the vicinity of the light source chamber 120, and an air cooling chamber And a blower fan 117 which is located inside 127 and cools the exhaust temperature reducing device 114.

Further, the front plate 12 is provided with an exhaust hole 17 provided with a louver 20 that exhausts exhausted hot air from the light source chamber 120 and the air cooling chamber 127 to the outside.
The light source chamber 120 is partitioned from the interior of the projector 10 by a first partition 121, a second partition 122, a third partition 123, a fourth partition 124, and a fifth partition 125, which are walls. A front plate 12 is provided in front, and the upper portion is covered with a house cover 130.

  The air cooling chamber 127 is partitioned from the interior of the projector 10 by the second partition wall 122 and the sixth partition wall 126 which are walls, and the front plate 12 is provided in front and the upper portion is covered with the house cover 130. The outside air is sucked by the intake fan 118 from the intake port 18 provided on the side wall of the projector 10, and the exhaust temperature reducing device 114 protruding into the air cooling chamber 127 is cooled to cool the exhaust temperature reducing device 114. It is assumed that the air is discharged from the exhaust hole 17 of the front plate 12.

  According to the present embodiment, a projector capable of preventing the hot air discharged to the front of the projector 10 from becoming extremely hot even in a small housing and effectively cooling the light source device 63 that becomes hot. Can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a projector according to an embodiment of the present invention has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers a projection port on the side of a front plate 12 that is a main body case. The face plate 12 is provided with a plurality of exhaust holes 17, and the exhaust holes 17 are provided with louvers 20 for preventing the light in the housing from leaking to the outside and preventing the exhaust hot air from flowing in front of the projection port. Yes.

  Although not shown in FIG. 1, a key / indicator portion is provided on the top plate 11 which is a main body case. The key / indicator portion includes a power switch key and power on / off. Are provided, such as a power indicator for informing the lamp, a lamp switch key for lighting the lamp of the light source device, a lamp indicator for displaying the lighting of the lamp, an overheat indicator for notifying when the light source device or the like is overheated.

  Further, on the back of the main body case (not shown), a control signal from a power supply adapter plug or a remote controller, and an input / output connector part provided with a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, etc. Is provided with an Ir receiving unit or the like.

  A plurality of air intake holes 18 are provided in the right side plate 14 which is a side plate of the main body case (not shown in FIG. 1) and the left side plate 15 which is the side plate shown in FIG.

  As shown in FIG. 2, the control circuit of the projector 10 includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, etc. The image signals of various standards input from the unit 21 are converted so as to be unified into image signals of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). Are sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted image signal in the video RAM, generates a video signal from the stored contents of the video RAM, and outputs the video signal to the display drive unit 26.

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. Yes, the light from the light source device 63 is incident on the display element 51 via the light source side optical system, thereby generating an optical image with the reflected light of the display element 51 and passing through the projection system lens group serving as the projection side optical system. An image is projected and displayed on a screen (not shown), and the movable lens group 97 of the projection system lens group is driven by a lens motor 45 for zoom adjustment and focus adjustment.

  In addition, the image compression / decompression unit 31 performs a recording process for sequentially writing a luminance signal and a color difference signal of an image signal to a memory card 32 that is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded on the memory card 32 is read, and individual image data constituting a series of moving images is expanded in units of one frame and sent to the display encoder 24 via the image conversion unit 23. A moving image or the like can be displayed based on the stored image data.

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

  Further, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface plate 11 of the main body case is directly sent to the control unit 38, and the key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is sent to the control unit 38.

  An audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts the audio data into analog data in the projection mode and the playback mode. The speaker 48 can be driven to emit loud sounds.

  The control unit 38 controls the power supply control circuit 41. When the lamp switch key is operated, the power supply control circuit 41 turns on the lamp of the light source device 63, and the cooling fan drive control circuit 43 Is to detect the temperature by a temperature sensor provided in the light source device 63 or the like and to control the rotation speed of the cooling fan.

  These ROM, RAM, IC and circuit elements are attached to the control circuit board 103 as the main control board. The power system power control circuit 41 is incorporated in the lamp power circuit block 101 to control the main control system. The control circuit board 103 as a board and the lamp power circuit block 101 of the power system are formed separately.

  Further, as shown in FIGS. 3 to 5, the internal structure of the projector 10 is such that a lamp power circuit block 101 incorporating a power control circuit 41 is disposed in the vicinity of the right side plate 14, and a sirocco is placed in the approximate center of the bottom plate 16. The fan type blower 110 is arranged as a cooling fan, the light source chamber 120 is arranged near the discharge port 113 of the blower 110, the air cooling chamber 127 is arranged near the right end of the light source chamber 120, and the air cooling chamber 127 and the lamp power supply circuit block An exhaust fan 117 is arranged at the boundary between a circuit such as 101 and various members, the projection side optical system 62 is arranged along the left side plate 15, and the back surface of the light source chamber 120 between the blower 110 and the projection side optical system 62 A light source side optical system 61 is arranged on the side.

  As shown in FIG. 6, the light source chamber 120 includes a first partition wall 121, a second partition wall 122, a third partition wall 123, a fourth partition wall 124, and a fifth partition wall 125, which are walls. The front plate 12 is provided in front of the housing 12 and the upper portion is covered with a house cover 130 as shown in FIG. In addition, a light source device 63, a first reflection mirror 72, a color wheel 71, a wheel motor 73, a part of the light guide rod 75, and a part of the exhaust temperature reducing device 114 are provided inside, and a blower 110 is provided. All the exhaust air from the blower 110 is discharged into the light source chamber 120.

  The first partition wall 121 is first obliquely arranged at an arbitrary length from the discharge port 113 of the blower 110 in a direction substantially intersecting the front plate 12 and the right side surface 14, and then parallel to the front plate 12 from the end of the oblique portion. Slightly protrudes toward the right side 14.

  The second partition 122 is a partition for partitioning the light source chamber 120 and the air cooling chamber 127 and extends from the end of the first partition 121 to the front plate 12 parallel to the right side surface 14. An exhaust temperature reducing device 114 is inserted in the vicinity of the front plate 12.

  The third partition wall 123 is a wall for allowing a part of the exhaust air from the discharge port 113 of the blower 110 to flow to the color wheel 71 and the wheel motor 73. From the discharge port 113 of the blower 110, the left side surface 13 and the back plate 15 Are inclined at an arbitrary length in the direction of the substantially intersection. Further, vent holes and slits are formed so that the exhaust air from the discharge port 113 of the blower 110 directly hits the color wheel 71.

  The fourth partition wall 124 is a wall for separating the light source side optical system 61 and the light source device 63, and reaches the vicinity of the projection side optical system 62 through the light guide rod 75 from the end of the second partition wall 122.

  The fifth partition 125 is a wall that separates the projection-side optical system 61 and the light source device 63 and is provided to prevent high-temperature air from flowing into the projection-side optical system 62. The fifth partition 125 extends from the end of the fourth partition 124 to the front plate 12 in parallel with the left side surface 13.

  The air cooling chamber 127 is partitioned from the interior of the projector by a second partition wall 122 and a sixth partition wall 126 that are wall bodies, and is provided with a front plate 12 provided in front and covered with a house cover 130 above. Inside, a part of the exhaust temperature reduction device 114 and an exhaust fan 117 are provided.

  The sixth partition wall 126 is a partition wall for forming a space between the front plate 12 and the circuit and various members such as the lamp power circuit block 101. The sixth partition wall 126 is located in front of the intersection of the first partition wall 121 and the second partition wall 122. It goes straight to the vicinity of the right side surface 14 parallel to the face plate 12 and then reaches the front plate 12 parallel to the right side surface 14. On the surface of the sixth partition wall 126 that faces the circuit and various members such as the lamp power circuit block 101, the exhaust fan 117 sucks and exhausts air that has cooled the circuits and various members such as the lamp power circuit block 101. Vents and slits are provided so that the air temperature reducing device 114 can be exhausted.

The first partition 121, the second partition 122, the third partition 123, the fourth partition 124, the fifth partition 125, and the house cover 130 are made of heat-insulating plate materials. Thereby, the heat in the light source chamber 120 can be prevented from leaking to the outside.
In addition, the sixth partition wall 126 may be an integral wall that is continuous with the first partition wall 121, and the sixth partition wall 126 is provided with a vent or a slit so that a circuit such as the lamp power supply circuit block 101 or the like can be used. Although the exhaust fan can exhaust the air that has cooled the member, it is also possible to attach the exhaust fan 117 directly to the sixth partition wall 126.

  The exhaust temperature reducing device 114 is a heat conductive member, and in this embodiment, a heat pipe 115 having a capillary structure on the inner wall and a metal pipe having a vacuum inside is sealed with a working fluid such as pure water or perfluorocarbon. The fins 116 are used, and are arranged in the vicinity of the front plate 12 in parallel with the front plate 12.

  The exhaust temperature reducing device 114 has a structure in which a long rod-like heat pipe 115 is formed in a plate shape so as to penetrate through the center of the plurality of fins 116 and penetrates the second partition wall 122. The fin 116 is removed in the vicinity of the portion. At this time, the fin 116 is attached to the heat pipe 115 in a perpendicular direction. In other words, the light source chamber 120 and the air cooling chamber 127 are positioned on both sides of the second partition 122 and the exhaust temperature reducing device 114 passes through the second partition 122 perpendicularly.

  By attaching the fin 116 to the heat pipe 115 in this way, the fin 116 located on the light source chamber 120 side absorbs heat from the high-temperature exhaust and releases heat to the heat pipe 115, and the fin 116 located on the air cooling chamber 127 side performs air cooling. Heat can be radiated into the chamber 127, and the exhaust temperature reducing device 114 can be kept at a uniform temperature as a whole, and the exhaust temperature reducing device 114 can be kept at a low temperature. Accordingly, in this embodiment, the high temperature on the light source chamber 120 side can be efficiently moved to the air cooling chamber 127 side, and the exhaust temperature reducing device 114 as a whole can be kept at a relatively low temperature. It should be noted that the heat pipe 115 and the fin 116 can obtain the same effect by separate molding or integral molding.

  As shown in FIG. 4 or FIG. 6, the optical system of the projector 10 includes a light source device 63 in which an ultrahigh pressure mercury lamp is provided as a discharge lamp 64 inside a reflector 65 whose front surface is covered with an explosion-proof glass 68. A light source side optical system 61 that irradiates a DMD (digital micromirror device) that uses light emitted from the light source device 63 as a display element 51, a display element 51, and light that is reflected by the display element 51 to form an image. Is constituted by a lens group of the projection-side optical system 62 that emits the light to the screen.

  The light source side optical system 61 includes a first reflection mirror 72 that reflects light emitted from the light source device 63 to the color wheel 71, and color filters for red light, green light, and blue light in the surroundings, and a wheel motor. The color wheel 71 rotated by 73, the light guide rod 75 that uses the light transmitted through the filter of the color wheel 71 as a light beam having a uniform intensity distribution, and the direction of the light emitted from the light guide rod 75 is changed by 90 degrees. A light source side lens group 83 formed by a second reflection mirror 74 and a plurality of lenses for condensing the light reflected by the second reflection mirror 74 on the display element 51, and the light transmitted through the light source side lens group 83 as a display element 51 is formed by an irradiation mirror 85 that irradiates 51 at a predetermined angle.

The second reflection mirror 74 is fixed to the house cover 130 with a mirror fixture 70.
Although the second reflecting mirror 74 is used in this embodiment, it is only necessary to change the direction of light from the light guide rod 75, and the same effect can be obtained by using the light guide rod 75 and a prism in combination. be able to.

  In this embodiment, a part of the light guide rod 75 and the color wheel 71 are disposed in the light source chamber 120, but the color wheel 71 and the light guide rod 75 are disposed outside the light source chamber 120. Thus, the light source chamber 120 may be formed.

  Furthermore, as the projection-side optical system 62, as a fixed lens group 93 built in the fixed barrel 91 and a movable lens group 97 built in the movable barrel 95, a variable focus type lens having a zoom function is used. The movable lens group 97 is moved by the lens motor 45 to enable zoom adjustment and focus adjustment.

  Further, the back plate 13 is provided with an intake hole 18 in the rear portion of the display element 51, and an air flow path is formed by the back plate 15 and the display element mounting plate 55, and the intake hole 18 provided in the back plate 15 and Outside air sucked from an intake hole 18 provided behind the left side plate 15 is caused to flow along the back plate 15 in the direction of the blower 110.

  A display element heat radiating plate 53 is disposed behind the display element mounting plate 55, and the control circuit board 103 serves as two control boards between the two control circuit boards 103 or two control circuits. The air flowing along the control circuit board 103 above or below the board 103 is sucked into the suction port 111 of the blower 110.

  Therefore, when the blower 110 is rotated, the blower 110 serving as a cooling fan sucks in air around the blower 110 and sucks in air around the blower 110 inside the projector 10 so that a large number of intake air provided in the main body case of the projector 10 is sucked. Outside air is sucked into the projector 10 from the hole 18.

  Then, a part of the outside air sucked from the rear intake hole 18 in the left side plate 15 and the intake hole 18 provided in the rear plate 13, the rear plate 13 and the display element mounting plate 55 so as to cool the display element heat radiating plate 53. Between the air flow path between the control circuit board 103 and the upper and lower surfaces of the control circuit board 103 and the space between the control circuit boards 103 and sucked into the suction port 111 of the blower 110. Further, other outside air sucked from the suction hole 18 of the left side plate 15 cools the projection side optical system 62, the second reflection mirror 74, the exposed portion of the light guide rod 75, and the like, and is sucked into the suction port 111 of the blower 110. It is.

  Further, part of the outside air sucked into the projector 10 from the intake hole 18 of the right side plate 14 reaches the control circuit board 103 so as to pass around the lamp power circuit block 101 and flows along the control circuit board 103. In this way, the air is sucked into the air inlet 111 of the blower 110. Further, the remaining sucked outside air is sucked into the vent hole of the sixth partition wall 126 by the exhaust fan 117, and after the exhaust temperature reducing device 114 is cooled, it is discharged to the outside from the front plate 12.

  Also, a part of the exhaust flow of the blower 110 blown into the light source chamber 120 flows along the color wheel 71 from the vent hole of the third partition wall 123, and most of the flow flows around the light source device 63, as shown in FIGS. 6, a part of the air flowing around the light source device 63 flows from the opening provided in the reflector 65 so as to pass through the interior of the reflector 65, thereby cooling the light source device 63 and the color wheel 71.

  The hot air in the light source chamber 120 after cooling the light source device 63 and the color wheel 71 is guided to the first partition wall 121 and the second partition wall 122 and flows into the exhaust temperature reduction device 114, where the temperature is reduced. The air is discharged from the exhaust hole 17 of the front plate 12 to the outside.

  Thus, since the high-temperature air after cooling the light source device 63 is cooled by the heat pipe 115 and the fins 116, the cooled air can be discharged to the outside and provided in the exhaust hole 17 of the front plate 12. It is possible to prevent the generated louver 20 from becoming hot. Further, since the fins 116 are straightly formed on the heat pipe 115, the exhaust resistance of air from the light source device 63 can be reduced, and the temperature of the fins 116 can be prevented from becoming high.

  Also, the exhaust temperature reduction device 114 is divided into a light source chamber 120 for high-temperature exhaust and an air cooling chamber 127 side that exhausts air by flowing a relatively low-frequency air in the housing by an exhaust fan 117. Therefore, the exhaust from the light source chamber 120 can be discharged outside as a low-temperature exhaust. The cooling fan is not limited to the sirocco fan type blower 110.

Further, the fin 116 used in the exhaust temperature reducing device 114 is not limited to one that is formed straight and perpendicular to the heat pipe 115, and may have other configurations.
For example, as shown in FIG. 7, the fin 116 may be slightly rotated toward the fourth partition wall 124 and fixed in a state of being inclined with respect to the heat pipe 115.

Thereby, it is possible to prevent the exhaust air from the light source chamber 120 from flowing in the forward direction of the projection port.
Therefore, it is possible to more efficiently prevent the fluctuation of the projection image that occurs due to the flow of high-temperature air in the light irradiated on the screen from the projection-side optical system 62. Moreover, since the angle is provided, the air resistance is increased, and the temperature of the discharged air can be lowered more effectively.

  Further, as shown in FIGS. 8 to 10, the plate-like fins 116 may be bent, and the bent fins 116 may be attached to the heat pipe 115. Thereby, it is possible to prevent high-temperature exhaust gas from flowing in the forward direction of the projection port, and it is possible to prevent fluctuations in the projection image that are generated when high-temperature air flows into the projected light. Moreover, since there is an angle, the air resistance is increased, and the temperature of the discharged air can be effectively reduced.

Further, since the light is not leaked to the outside because it is bent halfway, there is no need to attach a louver 20 to the exhaust hole 17 of the front plate 12, reducing the exhaust resistance at the exhaust hole 17 of the front plate 12 and improving the exhaust efficiency. Can be better.
In addition, the place to be bent is not particularly limited, and as shown in the drawing, when the fin 116 is formed by reducing the portion orthogonal to the heat pipe 115, or the portion orthogonal to the heat pipe 115 and the inclined portion. In the case where they are substantially equal, there are cases in which the fins 116 are provided with many orthogonal portions.

  Next, another embodiment of the present invention will be described. The projector 10 of this embodiment is characterized by the structure of the air cooling chamber 127. As shown in FIG. 11, the air cooling chamber 127 of the present embodiment is molded by being surrounded by the second partition 122, the seventh partition 128, the front plate 12, and the right side surface 14.

  The seventh partition wall 128 extends from the intersection of the first partition wall 121 and the second partition wall 122 to the right side surface 14 in parallel with the front plate 12. An intake fan 118 is disposed between the seventh partition wall 128 and the front plate 12 in the vicinity of the right side surface 14.

  The intake fan 118 sucks outside air into the air cooling chamber 127 from the intake hole 18 on the right side surface 14, and the low temperature air thus sucked cools the air cooling chamber 127 side of the outside air temperature reducing device 114. As a result, the heat pipe 115 can be kept at a low temperature, and the temperature of the outside air temperature reducing device 114 on the light source chamber 120 side can be kept low.

In the previous embodiment, the outside air temperature reducing device 114 is cooled by using air that has cooled the circuits such as the lamp power circuit block 101 and various members, but in this embodiment, the outside air is cooled by the outside air temperature reducing device 114. Since it is directly used for this purpose, the cooling effect can be further enhanced.
Other configurations are the same as in the previous embodiment.
Further, in this embodiment, the air cooling chamber 127 is provided and the exhaust fan 117 is installed in the air cooling chamber 127. However, a part of the air that has cooled the circuits such as the power supply circuit block 101 and various members is connected to the exhaust temperature reducing device 114. Any structure can be used as long as it can be cooled, and the same effect can be obtained by installing the exhaust fan 117 without providing the air cooling chamber 127.

  The exhaust temperature reducing device of the present invention is not limited to a projector, and the above-described projector that generates less heat than the first heat source, which is a light source in the case of the above-described projector, in the housing. In other words, the first cooling fan has a second heat source corresponding to a circuit board or the like, and cools the first heat source, the second cooling fan that cools the inside of the housing, and the first cooling fan is the first cooling fan. An exhaust temperature reduction device that reduces the temperature of the high-temperature air generated by cooling the heat source, the exhaust temperature reduction device partly contacting the exhaust of the first cooling fan, and the other part It can be used as an electric device having a structure that contacts the exhaust of the second cooling fan, and can also be applied to a device using a rear projection TV, a personal computer, or a fuel cell.

  And this invention is not limited to the above Example, A change and improvement are freely possible in the range which does not deviate from the summary of invention.

The figure which shows the external appearance of the data projector concerning one Example of this invention. The control block diagram of the data projector concerning one Example of this invention. The perspective view which removed the upper surface board of the data projector concerning one Example of this invention. The perspective view which removed the upper surface board and house cover of the data projector concerning one Example of this invention. The perspective view which shows the flow of the air of the data projector concerning one Example of this invention. Explanatory drawing of the light source room of the data projector concerning one Example of this invention. Explanatory drawing of the light source room of the data projector concerning one Example of this invention. Explanatory drawing of the light source room of the data projector concerning one Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overview of an outside temperature reducing device for a data projector according to one embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overview of an outside temperature reducing device for a data projector according to one embodiment of the present invention. The perspective view of the projector of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Projector 11 Top plate 12 Front plate 13 Back plate 14 Right side plate 15 Left side plate 16 Bottom plate 17 Exhaust hole 18 Intake hole 19 Lens cover 20 Louver 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM 26 display drive unit 31 image compression / decompression unit 32 memory card 35 Ir reception unit 36 Ir processing unit 37 key / indicator unit 38 control unit 41 power supply control circuit 43 cooling fan drive control unit 45 lens motor 47 audio processing unit 48 speaker 51 display element 53 heat sink 55 display element mounting plate 61 light source side optical system 62 projection side optical system 63 light source device 64 discharge lamp 65 reflector 66 opening 68 explosion proof glass 70 mirror fixture 71 color wheel 72 first reflection mirror 73 wheel Motor 74 Second reflection mirror 75 Light guide rod 81 Lens barrel 83 Light source side lens group 85 Irradiation mirror 91 Fixed barrel 93 Fixed lens group 95 Movable barrel 97 Movable lens group 101 Lamp power supply circuit block 103 Control circuit board 110 Blower 111 Suction port 113 Discharge port 114 Exhaust temperature reducing device 115 Heat pipe 116 Fin 117 Exhaust fan 118 Intake fan 120 Light source chamber 121 First partition 122 Second partition 123 Third partition 124 Fourth partition 125 fifth partition 126 Sixth partition 127 Air cooling Chamber 128 Seventh partition 130 House cover

Claims (11)

A light source device;
A light source side optical system;
A display element for generating a projection image;
A projection-side optical system for projecting the generated projection image;
A cooling fan for cooling the light source device;
An exhaust temperature reduction device that reduces the temperature of the high-temperature air generated by the cooling fan cooling the light source device;
Having a light source chamber for cutting off heat from the light source device;
The front plate of the projector that covers the front of the light source chamber has an exhaust hole for exhausting the exhaust from the light source chamber to the outside,
Further, the projector has a blower fan in the vicinity of the light source chamber, and a part of the exhaust temperature reducing device protrudes from the light source chamber and is positioned in the vicinity of the blower fan.   The projector according to claim 1, wherein the exhaust temperature reducing device is disposed between the front plate and the light source device and is located in the vicinity of the front plate.   The exhaust temperature reducing device includes a heat pipe and a plurality of plate-shaped fins, and the heat pipe is connected through a central portion of the plate surface of the plate-shaped fins. The projector according to claim 1, wherein:   The projector according to claim 3, wherein the fin is attached perpendicularly to a longitudinal direction of the heat pipe.   The projector according to claim 3, wherein the fin is attached to the heat pipe at an angle.   The projector according to any one of claims 3 to 5, wherein the fin is processed by bending a plate surface.   The air cooling chamber is provided in the vicinity of the light source chamber, and the blower fan and a part of the exhaust temperature reducing device protruding from the light source chamber are disposed in the air cooling chamber. 6. The projector according to any one of 6.   The projector according to claim 7, wherein the air cooling chamber and the light source chamber share a single partition, and the exhaust temperature reduction device is installed through the partition.   9. The projector according to claim 7, wherein the blower fan is an exhaust fan that exhausts air in the housing to the outside from an exhaust hole of the front plate through an air cooling chamber.   The projector according to claim 7 or 8, wherein the blower fan is an intake fan that sucks outside air into the air cooling chamber and discharges the air from an exhaust hole of the front plate. In an electrical apparatus having a first heat source in a housing and a second heat source that generates less heat than the first heat source,
A first cooling fan for cooling the first heat source;
A second cooling fan for cooling the inside of the housing;
An exhaust temperature reducing device for reducing the temperature of hot air generated by the first cooling fan cooling the first heat source;
A part of the exhaust temperature reducing device is in contact with the exhaust of the first cooling fan, and the other part is in contact with the exhaust of the second cooling fan.

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