JP2008026723A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device which is thinned, has high efficiency of using emitted light and has high cooling efficiency, and to provide a projector that uses the light source device. <P>SOLUTION: The light source device 63 for the projector is equipped with a reflector 65 whose inner surface is made a reflection surface, which has a front aperture part 131 in front, whose cross section is substantially semi-elliptical and which has an upper notch part 133 and a lower notch part 134 with notches made parallel planes vertically; a discharge lamp 64 fixed by a lamp fixing part 135 inside the reflector; an upper light-shielding plate 137 covering over the upper notch part 133 and the upper part of a lens fixing member 144; and a lower light-shielding plate 138 covering over the lower notch part 134 and the lower part of the lens-fixing member 144. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source device and a projector that projects an image based on a video signal or the like provided with the light source device.

  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 small high-intensity light source device such as a metal highland lamp or an ultra-high pressure mercury lamp, and condenses the light emitted from this light source on a micromirror display element called DMD or a liquid crystal plate. A color image is displayed on a screen.

  Such projectors have been downsized in recent years, and the light source device has been downsized in accordance with the downsizing of the projector housing, and many inventions have been proposed to efficiently use the light emitted from the light source device. Has been.

For example, in Japanese Laid-Open Patent Publication No. 10-171362 (Cited Document 1), a louver is conventionally formed in the opening of the light source device to prevent light from leaking, but a lamp shade is provided instead of the louver. An invention in which light is blocked is proposed. In the present invention, the light shielding efficiency is improved as compared with the case where the light is shielded using a conventional louver, and the cooling air flow is improved, so that the cooling efficiency is improved.
Japanese Patent Laid-Open No. 10-171362

  However, since projectors in recent years are becoming smaller and thinner, the thickness of the projector housing is determined by the thickness of the reflector of the light source device, and a high-intensity light source device using a discharge lamp is Since the discharge lamp has a high temperature close to 1,000 ° C., there is a limit to miniaturization, and it has been difficult to provide a light source device that is thin, has high use efficiency of emitted light, and has high cooling efficiency.

  The present invention has been made in view of the above-described problems of the prior art, and provides a light source device that is thin, has high use efficiency of emitted light, has high cooling efficiency, and a projector using the light source device. For the purpose.

  The light source device (63) of the present invention has an upper cut portion (133) having an inner surface as a reflection surface, a front opening (131) in the front, a substantially semi-elliptical cross section, and a parallel cut surface at the top and bottom. And a reflector (65) having a lower notch (134), a discharge lamp (64) fixed by a lamp fixing part (135) inside the reflector, an upper notch (133) and a lens fixing member (144 ) And a lower light shielding plate (138) covering the lower notch (134) and the lower portion of the lens fixing member (144).

  The lens fixing member (144) is located in front of the front opening (131) and fixes the light source lens (132). The lens fixing member (144) includes the light source lens (132) and the front opening (131). A gap serving as an air flow path is formed between the lamp fixing part (135) and the rear part of the reflector (65), and a cooling air flow path is provided at the periphery of the lamp fixing part (135). The explosion-proof filter (139) is disposed in the vicinity of these gaps.

  The upper light shielding plate (137) includes an explosion proof filter fixing portion (140) for locking the explosion proof filter (139), and a mesh shape is provided between the lower cut portion (134) and the lower light shielding plate (138). The explosion-proof filter (139) is locked between the explosion-proof filter fixing portion (140) and the protection plate (142).

  Furthermore, the upper light-shielding plate (137) and the lower light-shielding plate (138) are formed of members having high thermal conductivity, and the protective plate (142) is formed of a rigid body such as iron. Further, a step (141) serving as an air flow path is provided on the outer surface of the lower light shielding plate (138).

  The projector (10) of the present invention includes a light source device (63), an optical unit (77) including an optical system and a display element (51), and a projector control means (103). ) Is what uses what was mentioned above.

  According to the present invention, it is possible to provide a light source device that is thin, has high use efficiency of emitted light, and has high cooling efficiency, and a projector using the light source device.

  The projector 10 of the best mode for carrying out the present invention includes a light source device 63, an optical unit 77 including a light source side optical system, a projection side optical system 62, a display element 51, and the like, and a projector control means 103. It is.

  The light source device 63 has a reflection surface on the inner surface, a front opening 131 on the front, an upper cut portion 133 and a lower cut portion 134 having a substantially semi-elliptical cross section and a plane parallel to the top and bottom. Reflector 65, discharge lamp 64 fixed inside the reflector 65 by a lamp fixing part 135, upper light shielding plate 137 covering the upper notch part 133 and the upper part of the lens fixing member 144, lower notch part 134 and lens fixing A lower light shielding plate 138 covering the lower part of the member 144 is provided.

  The lens fixing member 144 is provided in front of the front opening 131 and fixes the light source lens 132. The lens fixing member 144 has a gap as an air flow path formed between the light source lens 132 and the front opening 131. The lamp fixing part 135 is located at the back of the reflector 65, and a gap serving as a cooling air flow path is formed at the periphery of the lamp fixing part 135, and an explosion-proof filter 139 is provided in the vicinity of these gaps. Are arranged.

  The upper light shielding plate 137 includes an explosion proof filter fixing portion 140 for locking the explosion proof filter 139. The upper light shielding plate 137 includes a mesh-shaped protective plate 142 between the lower cut portion 134 and the lower light shielding plate 138. 139 is locked between the explosion-proof filter fixing part 140 and the protection plate 142.

  Furthermore, the upper light-shielding plate 137 and the lower light-shielding plate 138 are formed of members having high thermal conductivity, and the protective plate 142 is formed of a rigid body such as iron. Further, the outer surface of the lower light shielding plate 138 has a step 141 serving as an air flow path.

  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 includes a lens cover 19 that covers a projection port on a side of a front plate 12 that is a front side plate of a main body case. The front plate 12 is provided with a plurality of exhaust holes 17. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  The top plate 11 as a main body case is provided with a key / indicator section 37. The key / indicator section 37 includes a power switch key, a power indicator for notifying power on / off, and a lamp of the light source device. A key or indicator such as a lamp switch key for turning on the lamp, a lamp indicator for displaying the lighting of the lamp, an overheating indicator for notifying when the light source device or the like overheats is provided.

  Further, on the back surface of the main body case, there are provided various terminals 20 such as an input / output connector portion and a power adapter plug for providing a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal and the like on the back plate. Is.

  A plurality of air intake holes 18 are provided in the vicinity of the lower portion of the right side plate 14 which is a side plate of the main body case (not shown) 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 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.

  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 through the light source side optical system to form an optical image with the reflected light of the display element 51, and 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 out, and individual image data constituting a series of moving images is decompressed 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 discharge lamp 64 of the light source device, and further the cooling fan drive control circuit 43. The temperature detection is performed by a plurality of temperature sensors provided in the light source device, etc., and the rotation speed of the cooling fan is controlled, and the rotation of the cooling fan is continued even after the light source device lamp is turned off by a timer, etc. Further, depending on the result of temperature detection by the temperature sensor, control such as stopping the light source device and turning off the power of the projector main body is also performed.

  These ROM, RAM, IC and circuit elements are attached to the control circuit board 103 as the main control board shown in FIG. 3, and the power system power supply control circuit 41 is incorporated in the lamp power supply circuit block 101 for control. A control circuit board 103 as a main control board of the system and a power control circuit board 102 to which the lamp power circuit block 101 of the power system is attached are formed separately.

  As shown in FIG. 3, the projector 10 has an internal structure in which a power supply control circuit board 102 with a lamp power supply circuit block 101 and the like mounted thereon is disposed in the vicinity of the right side plate 14 and the inside of the casing is divided by a partition wall 120. An intake side space chamber 121 on the back plate 13 side and an exhaust side space chamber 122 on the front plate 12 side are formed in an airtight manner, and a sirocco fan type blower 110 is used as a cooling fan in the intake side space chamber 121 in the vicinity of the back plate 13. The discharge port 113 of the blower 110 is disposed in the exhaust side space chamber 122 on the bottom plate.

  Further, as shown in FIG. 4, a light source device 63 is disposed in the exhaust side space 122, an optical system unit 77 is disposed along the left side plate 15, an illumination side block 78, an image generation block 79, a projection The illumination side block 78 of the optical system unit 77 configured with the side block 80 is in open communication with the exhaust side space chamber 122 so that a part of the optical system unit 77 is located in the exhaust side space chamber 122, and the exhaust side An exhaust temperature reducing device 114 is disposed along the front plate 12 of the space chamber 122.

  Further, the bottom plate 16 of the projector 10 has an opening into which the light source device 63 can be inserted. The light source device 63 is inserted into the exhaust side space chamber 122 through this opening and is fixed from the bottom by a lamp cover. ing. That is, the light source device 63 can be replaced from the opening of the bottom plate 16.

  As shown in FIGS. 4 and 5, the optical system unit 77 includes three blocks: an illumination side block 78 located in the vicinity of the light source device 63, an image generation block 79, and a projection side block 80. The illumination side block 78 is provided with a first reflecting mirror 72 for reflecting light emitted from the light source device 63 to the color wheel 71, and color filters for red light, green light, and blue light are provided around the wheel. A color wheel 71 that is rotated by a motor 73 and a light tunnel 75 that uses light transmitted through a filter of the color wheel 71 as a light flux having a uniform intensity distribution are provided. In addition, as shown in FIG. 4, an illumination-side block partition wall 127 connected to the partition partition wall 120 so as to penetrate the light tunnel 75 is provided.

  The image generation block 79 includes a second reflection mirror 74 that changes the direction of light emitted from the light tunnel 75, and a plurality of lenses that condenses the light reflected by the second reflection mirror 74 on the display element 51. A light source side lens group 83 formed in step (1), an irradiation mirror 84 for irradiating the light transmitted through the light source side lens group 83 to the display element 51 at a predetermined angle, and the DMD (digital micromirror) serving as the display element 51 A device), a display element unit for holding the display element 51, and the like. A display element cooling device 53 for cooling the display element 51 is disposed on the back plate 13 side of the display element 51.

  Further, the projection side block 80 has a lens group of the projection side optical system 62 that emits light that is reflected by the display element 51 and forms an image to the screen. The projection side optical system 62 includes a fixed lens barrel. The lens is composed of a fixed lens group 93 built in the lens and a movable lens group 97 built in the movable lens barrel, and is a variable focus type lens having a zoom function. The lens is moved by moving the movable lens group 97 by a lens motor. Adjustment and focus adjustment are possible.

  An optical system control board 86 for controlling zoom and focus adjustment of the projection-side optical system is disposed between the optical unit 77 and the left side plate 15, and this optical system control board 86 is movable or movable. By controlling the operation of the lens group 97, a zoom function and focus adjustment can be performed.

  Further, the illumination side block 78 and the projection side block 80 are arranged adjacent to each other so as to form a gap 128 serving as a cooling air flow path between both blocks, and a part of each block has an outer wall. It has. The image generation block 79 connects the illumination side block 78 and the projection side block 80, and the optical system unit 77 has the optical axis of the illumination side block 78 and the optical axis of the projection side block 80 parallel to each other as a whole. It has a shape of the shape. Further, the outer wall of the illumination-side block 78 that is at a high temperature of the optical system unit 77 is formed using a heat insulating member having a low thermal conductivity such as a resin in order to reduce heat conduction.

In some cases, the outer wall of the illumination side block 78 is formed using a metal that is light in weight and high in heat conduction, such as aluminum, and the heat of the illumination side block 78 is radiated to the outside.
Further, the illumination-side block partition wall 127 of the illumination-side block 78 has a cutout 129 serving as an air flow path in the upper part near the light tunnel 75.

  As shown in FIGS. 6 to 10, the light source device 63 includes a reflector 65 having a reflective film on the inner surface and a front opening 131 in the front, and a halogen incorporated in the reflector 65. A lens fixing member 144 having an opening through which cooling air can flow into the reflector 65 is disposed at the front end of the front opening 131 of the reflector 65. The light source lens 132 is fixed to the lens fixing member 144.

  Further, the reflector 65 is thin by forming an upper cut portion 133 and a lower cut portion 134 having a substantially semi-elliptical cross section and having upper and lower cut surfaces parallel to each other. Furthermore, a lamp fixing part 135 for fixing the discharge lamp 64 is provided at the back of the reflector 65, and a gap serving as a cooling air flow path is formed at the periphery of the lamp fixing part 135. A lead wire 143 for supplying power is connected to an end portion on the rear side. The lead wire 143 is connected to a connector 136 that is connected to the power supply unit of the projector 10.

  An upper light shielding plate 137 and a lower light shielding plate 138 for blocking light and heat leakage are fixed to the upper cut portion 133 and the lower cut portion 134. As shown in FIG. 7, the upper light shielding plate 137 covers from the opening on the upper surface side of the lens fixing member 144 to the upper cut portion 133 of the reflector 65, and is an explosion-proof for locking an explosion-proof filter 139 described later. A filter fixing unit 140 is provided to block light from the discharge lamp 64.

  Further, as shown in FIGS. 9 and 10, the lower light shielding plate 138 blocks the lens fixing member 144 from the bottom surface side to the lower cut portion 134 and extends further rearward, and shields light from the discharge lamp 64. ing. Further, as shown in FIG. 8, when the light source device 63 is fixed to the projector housing, a step 141 for forming an air flow path for cooling is formed between the lamp cover and the light source device 63. Yes.

  The upper and lower light shielding plates 137 and 138 are extremely hot because they are directly irradiated with the light from the discharge lamp 64, and therefore there is a problem that the metal plates are deformed when a metal having poor thermal conductivity is used. Therefore, in this embodiment, the deformation is prevented by forming using a metal having a good thermal conductivity such as an aluminum material or copper.

  Further, a mesh-shaped protective plate 142 is disposed between the lower light shielding plate 138 and the reflector 65, and this protective plate 142 is formed using a rigid body such as iron in order to fix the explosion-proof filter 139 and the like. ing. Further, the protective plate 142 can prevent direct contact with the reflector 65 that becomes high temperature when the light source device 63 is replaced.

  Further, in the vicinity of the opening of the lens fixing member 144 and the vicinity of the gap formed at the periphery of the lamp fixing portion 135, a mesh shape for preventing the glass or the like from jumping to the outside when the discharge lamp 64 explodes. An explosion-proof filter 139 is arranged. The explosion-proof filter 139 is engaged with the explosion-proof filter fixing portion 140 and the protection plate 142 of the upper light shielding plate 137.

  In addition, as shown in FIG. 10, the discharge lamp 64 is a spherical light emitting portion and two sealing portions attached coaxially through the center of the light emitting portion at symmetrical positions on the outer surface of the light emitting portion. A first sealing part and a second sealing part are provided, and an end of the first sealing part has a lamp cap serving as an electrode, and a lead wire 143 is attached to the end of the second sealing part And connected to the lamp power supply circuit via the connector 136.

  As shown in FIG. 3, the blower 110 as a cooling fan for cooling the light source device 63 has a suction port 111 in the center, and the discharge port 113 has a substantially square cross section. 120 and an illumination side block partition wall 127, and exhaust air from the blower 110 is exhausted to an exhaust side space 122 partitioned by the partition partition wall 120 and the illumination side block partition wall 127. A control circuit board 103 is disposed in the vicinity of the suction port 111.

  Further, as shown in FIGS. 3 to 5, the partition wall 120 includes an intake side space chamber 121 in which relatively low temperature devices such as various optical systems and various substrates are arranged, and a light source device 63. The apparatus is partitioned into a high-temperature device and an exhaust-side space chamber 122 in which a light source unit such as a first reflection mirror 72 and a color wheel 71 disposed near the light source device 63 is disposed.

Each partition wall 120 is composed of a plate-shaped first partition wall 123 and a second partition wall 124. Further, as shown in FIG. The upper part of the side space chamber 122 is a multilayer.
The first partition wall 123 is a partition wall for guiding a part of the exhaust air from the discharge port 113 of the blower 110 to the illumination side block 78 that is disposed in the vicinity of the light source device 63 of the optical system unit 77 and becomes high temperature. In addition, an oblique length is provided obliquely from the blower air outlet 113 toward the back plate 15 and connected to the end of the illumination-side block partition wall 127 in the optical system unit 77. Although not shown, the first partition wall 123 is formed with a vent or a slit so that the exhaust air from the discharge port 113 of the blower 110 directly hits the color wheel 71.

  The second partition 124 is a partition for creating a space between the front plate 12 and circuits such as the lamp power supply circuit block 101 and the like, and is directed to the front plate 12 from the air outlet 113 of the blower. An oblique length is provided in an oblique direction, extending from this end to the right side 14 near the right side 14 in parallel with the front plate 12, and finally from the end to the right side 14 in parallel. 12 is a substantially bowl-shaped shape connected to 12. The shape of the second partition 124 is for dispersing the hot exhaust gas in the exhaust-side space chamber 121 over the entire front plate 12.

  Further, the upper heat insulating case 125 covers the entire upper part of the exhaust side space chamber 122, and is formed in substantially the same shape as the upper part of the exhaust side space chamber 122 as shown in FIGS. Yes. In addition, a plurality of spacers 157 are formed on the upper surface side to keep the space between the upper partition plate 126 stacked on the upper heat insulating case 125 at a certain level or more. Further, a peripheral wall 159 that supports the upper partition plate 126 and is engaged with the partition wall of the exhaust-side space chamber 122 is provided on the peripheral edge excluding the side located on the front plate 12 side of the projector 10. The upper end of the peripheral wall 159 has an L-shaped cross section so that the upper partition plate 126 can be locked while maintaining a constant distance from the upper partition plate 126.

  Further, a rectangular opening serving as an air inlet 151 that allows exhaust from the blower 110 to flow into the upper part of the upper heat insulating case 125 is formed at a position in the vicinity of the light source device 63. On the front plate 12 side of 151, a thin plate 152 made of stainless steel or the like is attached to the upper surface of the upper heat insulating case 125 to block a part of the air inlet 151. The thin plate 152 is formed thinner than the upper heat insulating case 125. Further, a small hole 155 for position support is formed in the vicinity of the center, and a putty 158 for filling gaps with various members is disposed at the end on the front plate 12 side.

  And this upper heat insulation case 125 is arrange | positioned so that the space for cooling used as an air flow path may be formed between the upper light-shielding plates 137 of the light source device 63, as shown in FIGS. Air flowing in from the air inlet 151 cools the upper light shielding plate 137 of the light source device 63. Further, the upper heat insulating case 125 forms an air inlet 151 from a position near the discharge port 113 of the blower 110 to a position directly above the light source device 63, and the upper heat insulating case 125 just above the light source device 63 of the air inlet 151. By placing a thin plate 152 made of stainless steel or the like thinner than the thickness of the light source device 63, a space that is wider by the difference in the thickness of both members than a case where a cooling space is formed only by the upper heat insulating case 125 is provided. The cooling efficiency can be increased.

  Further, the edge of the upper heat insulating case 125 on the front plate 12 side is airtightly attached to an exhaust temperature reducing device 114 described later, and high-temperature air exhausted to the outside from the exhaust side space chamber 122 is exhaust temperature reducing device 114. Is formed so that it always passes.

  The upper partition plate 126 is disposed on the L-shaped portion of the peripheral wall 159 formed on the peripheral edge of the upper heat insulation case 125, and a plurality of spacers 157 attached on the upper heat insulation case 125 provide a certain distance. In this state, a space serving as an air flow path is maintained between the upper heat insulating case 125 and the upper heat insulating case 125. Further, as shown in FIG. 16, the upper partition plate 126 is also provided with a position support small hole 155 through which the position support protrusion 156 formed on the back surface of the upper surface plate 11 of the projector 10 passes. This prevents the displacement of the arrangement positions of the upper heat insulating case 125 and the upper partition plate 126. Further, the front plate 12 side of the upper partition plate 126 is connected to the front plate 126.

  The upper heat insulation case 125 can prevent such seizure because the periphery of the fixture may be burned out if the fixture with high thermal conductivity such as metal is used. Therefore, a plurality of pressing members 153 formed of a cushion such as silicon material are arranged at arbitrary positions between the upper insulating case 125 and the upper partition plate 126, and the upper insulating plate 125 is pressed by pressing the upper partition plate 126. The shape is fixed.

  In addition, a temperature sensor 154 that detects abnormally high temperatures is disposed on the upper surface side of the upper heat insulating case 125, and a fixing tool having a high thermal conductivity such as metal is also used when attaching such a temperature sensor 154. Instead of using, it is fixed using a pressing material 153 formed of a cushion material such as a silicon material.

  Further, the upper partition plate 126 is also not provided with a metal fixing tool, like the upper heat insulating case 125, and a pressing member 153 formed of a cushioning material such as a silicon material is disposed between the upper surface plate and the upper partition plate 126. The upper partition plate 126 is pressed by the pressing material 153 and fixed.

  In addition, an aluminum sheet 161 is attached to the back side of the top plate 11 of the projector housing. By sticking the aluminum sheet 161 in this manner, the high temperature heat in the vicinity of the light source device 63 can be dispersed throughout the upper surface plate 11 to keep the temperature of the upper surface plate 11 uniform.

  The first partition wall 123 and the second partition wall 124 are made of a heat insulating member such as a resin similarly to the optical system unit 77. Accordingly, it is possible to prevent high heat generated by the light source device 63 in the exhaust side space chamber 122 from leaking to the intake side space chamber 121.

  Further, an exhaust temperature reducing device 114 for reducing the exhaust temperature in the exhaust side space chamber 122 and releasing it to the outside is provided near the front plate in the exhaust side space chamber 122. This exhaust temperature reducing device 114 is a heat conductive member, and in this embodiment, a heat conductive member 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 heat pipe and a plurality of fins 116 are used, and are arranged in the vicinity of the front plate 12 in parallel with the front plate 12.

  This exhaust temperature reduction device 114 has a plurality of fins 116 that are plate-like bodies arranged in parallel, and a long rod-like heat conduction member 115 passes through the approximate center of the fins 116 to connect the plurality of fins 116. Shape. That is, the heat conducting member 114 is in a plate shape and is in common contact with the plate surface of the plurality of fins 116.

  By attaching the fin 116 to the heat conducting member 115 in this way, the heat absorbed by the fin 116 can be released to the heat conducting member 115, and the exhaust temperature reducing device 114 can be kept at a uniform temperature as a whole.

  Further, the exhaust temperature reducing device 114 is located near the light source, and provides a difference in fluid resistance between a high temperature portion where high temperature exhaust hot air flows and its vicinity and a position away from the high temperature portion. Specifically, in the vicinity of the light source device 63 that is at a high temperature, the arrangement interval of the fins 116 is made close to suppress the outflow of air, and conversely, as the distance from the light source device 63 is increased, the arrangement interval of the fins 116 is gradually increased. As a result, the outflow of air is gradually increased.

  By adopting such a configuration, in a high-temperature portion where the arrangement interval is close, it becomes difficult to exhaust the air to the outside, so that the wind speed of the exhaust becomes slow, and thereby the fins 116 can sufficiently absorb heat, and the heat conducting member The endothermic efficiency of 115 is increased. On the other hand, since the wind speed of exhaust becomes high at a position away from the high temperature part where the arrangement interval is wide, it becomes easy to exhaust outside.

  For this reason, the heat contained in the exhaust of the high temperature part is absorbed by the heat conduction member, dissipated to the exhaust air at a position away from the high temperature part, and the heat is distributed and uniformed throughout the exhaust air, so that Since it is possible to prevent a large amount of high-temperature exhaust from being discharged, and the spacing between the fins 116 is gradually increased as the distance from the light source device 63 increases, the vicinity of the light source device 63 moves away from the light source device 63. The air flows, and the exhaust temperature reducing device 114 can be efficiently used to keep the exhaust temperature low.

  Next, the flow of air in the projector 10 will be described. As shown in FIG. 17, the back plate 13 is provided with an intake hole 18 at a rear portion where the display element 51 is located, and an air flow path between the back plate 13 and the optical system unit 77 having the display element 51. The outside air sucked from the intake holes 18 provided in the back plate 13 and the intake holes 18 provided behind the left side plate 15 is caused to flow along the back plate 13 in the direction of the blower 110.

  The control circuit board 103 serves as two control boards, and the air flowing along the control circuit board 103 is located between the two control circuit boards 103 or above or below the two control circuit boards 103. The air is sucked into the air inlet 111.

  Therefore, when the fan of the blower 110 is rotated, the blower 110 serving as a cooling fan sucks the surrounding air from the suction port 111 and sucks the air around the blower 110 inside the projector 10, so that the side plate of the housing of the projector 10 The outside air can be sucked into the projector 10 through a large number of intake holes 18 provided in the projector 10.

  A part of the outside air sucked from the intake holes 18 provided in the left side plate 15 and the back plate 13 forms an air flow path between the back plate 13 and the optical system unit 77 so as to cool the display element heat radiating plate 53. The air flows along the control circuit board 103 and is sucked into the suction port 111 of the blower 110 through the upper and lower surfaces of the control circuit board 103 and the space between the control circuit boards 103. The other outside air sucked from the suction hole 18 of the left side plate 15 cools the optical unit 77.

  In addition, the air flow in the vicinity of the optical system unit 77 is such that a part of the air sucked from the intake hole 18 of the left side plate 15 flows through the space between the optical system unit 77 and the bottom plate 16 and the illumination side block. It flows into the gap 128 between the projection side block 78 and the projection side block 80, and prevents the high temperature heat of the illumination side block 78 from being transmitted to the projection side block 80. The air flowing into the gap 128 flows into the intake side space chamber 121 in the housing through the cutout 129, and further sucked into the suction port 111 of the blower 110 and exhausted into the exhaust side space chamber 122.

  In addition, some of the outside air sucked into the projector 10 from the air intake hole 18 of the right side plate 14 passes through the periphery of the lamp power circuit block 101 and the like, reaches the control circuit board 103 while cooling the power circuit board 102, and is controlled. The air flows along the circuit board 103 and is sucked into the suction port 111 of the blower 110. The remaining sucked outside air flows along the first partition wall 121 and is sucked into the suction port 111 of the blower 110.

  A part of the exhaust from the blower 110 blown into the exhaust side space 122 flows along the color wheel 71, and most of the exhaust flows around the light source device 63 that has become hot. A part of the air flowing around the light source device 63 flows from the opening provided in the reflector 65 through the reflector 65 to the periphery of the discharge lamp, and from the gap of the lens fixing member 144 to the inside of the reflector 65. The other part flows in the vicinity of the first reflecting mirror 72, the color wheel 71, etc., and cools each part of the light source unit together with the light source device 63.

  Further, a part of the exhaust of the blower 110 blown into the exhaust side space 122 flows from the air inlet 151 of the upper heat insulating case 125 to the space between the upper light shielding plate 137 and the upper heat insulating case 125 of the light source device 63. The light source device 63 is cooled. Further, it flows into the space between the upper heat insulating case 125 and the upper partition plate 126, and prevents the heat in the exhaust side space chamber 122 from being transmitted to the upper surface plate.

  In addition, a part of the exhaust of the blower 110 also flows in the space between the step 141 formed on the bottom side of the lower light shielding plate 138 of the light source device 63 and the lamp cover, and the bottom plate 16 and the lamp cover of the casing of the projector 10 Prevents from becoming hot.

  In this way, the high-temperature air after the light source device 63 and the color wheel 71 are cooled in the exhaust-side space chamber 122 flows into the exhaust temperature reducing device 114, and is cooled and exhaust holes 17 provided in the front plate 12. Is more discharged.

  According to the present embodiment, by forming cuts on the top and bottom of the reflector 65 of the light source device 63, the thickness of the light source device 63 in the vertical direction is reduced, and the entire projector is thinned to provide a thin projector 10. In addition, by arranging the light shielding plates 137 and 138 in the notches, light leakage can be prevented and light can be prevented from directly irradiating anywhere in the projector, and the temperature inside the projector housing can be reduced. While being able to reduce, the temperature rise of a housing | casing can be prevented. Further, by arranging the light shielding plates 137 and 138 in this way, the light emitted from the discharge lamp 64 does not leak to the outside, and the utilization efficiency of the light emitted is increased.

  In addition, by forming several spaces in the vicinity of the light source device 63, a large number of cooling spaces can be provided even in a thin projector, enabling efficient cooling, and further, the temperature of the housing. The rise can be prevented.

  The present invention is not limited to the above-described embodiments, and can be freely changed and improved without departing from the gist of the invention.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. FIG. 3 is a diagram illustrating a functional circuit block of the projector according to the embodiment of the invention. FIG. 3 is a top view of the projector according to the embodiment of the present invention with the top plate removed. FIG. 3 is a top view showing the inside of an exhaust side space chamber of the projector according to the embodiment of the invention. FIG. 2 is a partially cutaway top view of the projector according to the embodiment of the invention. The perspective view of the upper part of the light source device which concerns on the Example of this invention. The top view of the light source device which concerns on the Example of this invention. The perspective view of the bottom part of the light source device which concerns on the Example of this invention. The bottom view of the light source device which concerns on the Example of this invention. Sectional drawing of the light source device which concerns on the Example of this invention. The top view of the upper heat insulation case which concerns on the Example of this invention. The bottom view of the upper heat insulation case which concerns on the Example of this invention. 1 is a cross-sectional view of a projector according to an embodiment of the invention. 1 is a cross-sectional perspective view of a projector according to an embodiment of the invention. 1 is a partial cross-sectional perspective view of a projector according to an embodiment of the invention. 1 is a simplified cross-sectional view of a projector according to an embodiment of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified diagram illustrating an air flow of a projector according to an embodiment of the invention.

Explanation 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 Various terminals
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Power supply control circuit 43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 51 Display element
53 Display element cooling device 62 Projection side optical system
63 Light source device 64 Discharge lamp
65 Reflector 71 Color wheel
72 First reflection mirror 73 Wheel motor
74 Second reflection mirror 75 Light tunnel
77 Optical system unit 78 Illumination side block
79 Image generation block 80 Projection side block
83 Light source side lens group 84 Irradiation mirror
86 Optical system control board 93 Fixed lens group
97 Movable lens group
101 Lamp power circuit block 102 Power control circuit board
103 Control circuit board 110 Blower
111 Suction port 113 Discharge port
114 Exhaust temperature reduction device 115 Heat conduction member
116 fin 120 partition wall
121 Inlet side space 122 Exhaust side space
123 1st partition 124 2nd partition
125 Upper insulation case 126 Upper partition plate
127 Lighting block block 128 Gap
129 Cutout 131 Front opening
132 Light source lens 133 Top notch
134 Lower notch 135 Lamp fixing part
136 Connector 137 Upper shading plate
138 Lower shading plate 139 Explosion-proof filter
140 Explosion-proof filter fixing part 141 Step
142 Protection plate 143 Lead wire
144 Lens fixing member 151 Air inlet
152 Thin plate 153 Pressing material
154 Temperature sensor 155 Position support small hole
156 Position support protrusion 157 Spacer
158 Putty 159 Perimeter wall
161 Aluminum sheet

Claims (14)

A reflector having an upper cut portion and a lower cut portion having an inner surface as a reflection surface, a front opening at the front, a substantially semi-elliptical cross section, and a cut surface parallel to the upper and lower sides;
A discharge lamp fixed inside the reflector by a lamp fixing part;
An upper light shielding plate covering the upper cut portion and the upper portion of the lens fixing member;
A light source device comprising: the lower cut portion and a lower light shielding plate that covers a lower portion of the lens fixing member. A lens fixing member that is positioned in front of the front opening and fixes the light source lens;
In the lens fixing member, a gap serving as an air flow path is formed between the light source lens and the front opening,
2. The light source device according to claim 1, wherein the lamp fixing part is located in a back part of the reflector, and a gap serving as an air flow path for cooling is formed at a periphery of the lamp fixing part. .   The light source device according to claim 2, wherein an explosion-proof filter is disposed in the vicinity of the gap between the light source lens and the front opening and the gap on the periphery of the lamp fixing portion. The upper light shielding plate includes an explosion-proof filter fixing portion for locking the explosion-proof filter,
A mesh-shaped protective plate is provided between the lower cut portion and the lower light shielding plate,
4. The light source device according to claim 1, wherein the explosion-proof filter is locked between the explosion-proof filter fixing portion and the protection plate. 5.   5. The light source device according to claim 1, wherein the upper light shielding plate and the lower light shielding plate are formed of a member having high thermal conductivity.   The light source device according to claim 4, wherein the protection plate is formed of a rigid body such as iron.   The light source device according to any one of claims 1 to 6, wherein a back surface of the lower light shielding plate has a step serving as an air flow path. A light source device;
An optical unit including an optical system, a display element, and the like;
Projector control means,
The light source device is
A reflector having an upper incision and a lower incision having an inner surface as a reflection surface, a front opening at the front, a substantially semi-elliptical cross section, and a cut plane parallel to the upper and lower sides;
A discharge lamp fixed inside the reflector by a lamp fixing part;
An upper shading plate covering the upper cut portion and the upper portion of the lens fixing member;
A projector comprising: the lower cut portion; and a lower light shielding plate that covers a lower portion of the lens fixing member. A lens fixing member that is positioned in front of the front opening and fixes the light source lens;
In the lens fixing member, a gap serving as an air flow path is formed between the light source lens and the front opening,
The projector according to claim 8, wherein the lamp fixing part is located in a back part of the reflector, and a gap serving as an air flow path for cooling is formed at a peripheral edge of the lamp fixing part.   The projector according to claim 9, wherein an explosion-proof filter is disposed in the vicinity of the gap between the light source lens and the front opening and the gap on the periphery of the lamp fixing portion. The upper light shielding plate includes an explosion-proof filter fixing portion for locking the explosion-proof filter,
A mesh-shaped protective plate is provided between the lower cut portion and the lower light shielding plate,
The light source device according to claim 8, wherein the explosion-proof filter is locked between the explosion-proof filter fixing portion and the protection plate.   The projector according to any one of claims 8 to 11, wherein the upper light shielding plate and the lower light shielding plate are formed of a member having high thermal conductivity.   The projector according to claim 11, wherein the protection plate is formed of a rigid body such as iron.   The light source device according to claim 8, wherein a back surface of the lower light shielding plate has a step serving as an air flow path.

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