JP4986019B2 - Optical system unit and projector - Google Patents

Description

  The present invention relates to an optical system unit and a projector including the optical system unit.

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

  In many cases, this data projector uses a small high-intensity light source such as a metal highland lamp or an ultra-high pressure mercury lamp, and light emitted from the light source is converted into light of three primary colors by a color filter. It is structured to irradiate a display element called DMD (Digital Micro Device) and project the transmitted light or reflected light of the display element onto a screen through a lens group which is a projection side optical system having a zoom function. Yes.

  This data projector incorporates a plurality of heat sources such as a light source, a light source side optical system, a power supply circuit, and a display element, and the light source is heated to nearly 1000 degrees. For this reason, a mechanism for cooling the light source device, the power supply circuit, and the like, which are heat sources by providing an air cooling fan, is incorporated. As such a cooling mechanism, a cooling air flow path is formed so that a light source device having a high temperature and a large amount of heat generation is separated from other heat generation sources, and cooling is performed by cooling an optical system at a temperature lower than that of the light source device. Proposals have been made of cooling a light source with wind and cooling with a cooling air in which a power source unit or the like is provided with a flow path different from that of the light source.

  For example, in Japanese Patent Application Laid-Open No. 2005-173020 (Patent Document 1), a plurality of cooling fans are used to cool a heat source of each partition flow path by providing a substrate and partition walls for creating an air flow in a housing. Air inside the housing is exchanged with outside air through the exhaust holes and intake holes.

  However, the light source becomes hot from several hundred degrees to nearly 1000 degrees, and in order to reduce the exhaust temperature by mixing high-temperature exhaust hot air that has cooled these light sources and the outside air, a distance from the heat source may be required. In many cases, it has become necessary to increase the thickness of the projector or increase the size of the housing. In addition, the high-temperature exhaust hot air sometimes heats the exhaust hole and its surroundings, and there is also a problem that if the exhaust hot air circulates in front of the projection lens, the projection image fluctuates.

  Further, the light source side optical system and the projection side optical system are made to be L-shaped by crossing the optical axis of the light source side optical system and the optical axis of the projection side optical system so that the exhaust heat from the light source is not transmitted to the projection side optical system. Many of them are arranged to increase the distance between the light source and the projection-side optical system (for example, Patent Document 2).

  Further, in JP-A-2001-174920 (Patent Document 2), an intake fan is disposed in the vicinity of the projection port, an exhaust fan is disposed in the vicinity of the light source device, and an air flow path is formed between them. Thus, there has been proposed a cooling mechanism for a projection apparatus in which various optical systems are cooled with low-temperature air sucked from an intake fan and then the light source device is cooled.

The projector of Patent Document 2 is a projector in which exhaust from the exhaust fan does not affect the air sucked from the intake fan because the intake fan and the exhaust fan can be arranged at a distance.
JP 2005-173020 A Japanese Patent Laid-Open No. 2001-174920

  In recent years, projectors have been reduced in size and thickness, and it is difficult to secure a wide space for cooling, and various optical systems are often integrated as an optical system unit. The light source side optical system close to the apparatus and the projection side optical system have to be arranged close to each other.

  In addition, the projection-side optical system is heated to transmit most of the light emitted from the light source device, and the lens may expand, resulting in fluctuations in the projected image and defocusing. In addition, a bonded lens is used. However, the laminated lens has a problem that it may be peeled off or damaged due to the difference in thermal expansion coefficient.

  SUMMARY An advantage of some aspects of the invention is that it provides an optical system unit with high cooling efficiency of a projection-side optical system and a projector including the optical system unit. And

The projector (10) of the present invention includes a light source device (63), an optical system unit (77) including an optical system and a display element (51), and a control circuit board (103) including a projector control means, The optical system unit (77) illuminates the illumination element block (78) that guides light from the light source device (63), and the light that has passed through the illumination element block (78) to the display element (51). An image generation block (79) having an image generation means for generating image light by the display element (51), and a projection side block (80) having a projection lens for enlarging and projecting the image light by the projection side optical system (62) in is formed, the projection side block (80) state, and are not covered with the upper by barrel cover comprising a heat sink (91) on the upper surface (92), also the barrel cover (92), the barrel The cover (92) has a rectifying wall (93) that divides the upper part of the projection side optical system (62) into an upper part and a side part of the projection side optical system (62).

As the rectifying wall (93), the rectifying wall (93) is disposed in parallel with the optical axis of the projection-side optical system (62), and the tip of the rectifying wall (93) in the projection direction is refracted in the direction in which outside air flows, The outside air that flows in may be divided into two. In this case, the front end portion in the projection direction of the heat sink (91) formed on the projection side optical system (62) may be refracted in the direction in which the outside air flows.
Further, the lens barrel cover (92) has a rectifying wall (93) at the upper part of both side ends of the projection side optical system, and a heat sink (91) may be formed between the rectifying wall (93). .

The housing in the vicinity of the optical system unit (77) has a plurality of air intake holes (18), and the upper portion of the housing is disposed between the projection side block (80) and the side plate of the housing. 11) has an air flow path forming plate in contact with the front end of the air flow path forming plate located behind the front end portion of the projection side block (80), and the air inlet port is in front of the air flow path forming plate. The illumination side block (78) is arranged such that the optical axis of the illumination side block (78) and the optical axis of the projection side block (80) are parallel, and the illumination side block (78) and the projection side Between the blocks (80), there is an illumination side block partition wall (127), an air flow path forming plate, an illumination side block partition wall (127), a lens barrel cover (92), and an upper surface plate (11 ) And the optical system control board (86) may be used as an air flow path forming plate, and further includes an optical system control board. The air flow path It is also one in which there is to be Naruban.

Further, the optical system unit (77) of the present invention irradiates the illumination element block (78) for guiding the light from the light source and the display element (51) with the light via the illumination block (78). An image generation block (79) for generating image light by the display element (51) and a projection side block (80) for enlarging and projecting the image light by the projection side optical system (62), the projection side block (80) The upper surface is covered with a lens barrel cover (92) having a heat sink (91) on the upper surface, and the lens barrel cover (92) is arranged on the upper side of the lens barrel cover (92) of the projection side optical system (62). It has a rectifying wall (93) partitioned into an upper part and a side part of the projection side optical system (62).

  ADVANTAGE OF THE INVENTION According to this invention, the projector provided with the optical system unit with the high cooling efficiency of a projection side optical system, and the said optical system unit can be provided.

  The projector 10 of the best mode for carrying out the present invention includes a light source means, an image generating means for irradiating the display element 51 with light from the light source means and generating image light by the display element 51, and image light. A projection lens for enlarging and projecting a part of the projection lens, and a part of the projection lens is covered with a lens barrel cover 92 having a heat dissipation structure.

  The light source device 63 includes a light source device 63, an optical system unit 77 including an optical system and a display element 51, and a control circuit board 103 including a projector control unit. An illumination side block 78 that guides light, and an image generation block 79 that includes image generation means for irradiating the light through the illumination side block 78 to the display element 51 to generate image light on the display element 51; The projection side block 80 is formed with a projection side block 80 provided with a projection lens for enlarging and projecting image light by the projection side optical system 62, and the projection side block 80 is covered with a lens barrel cover 92 having a heat sink 91 having a heat dissipation structure on the upper surface. It is what.

  Also, the housing near the optical system unit 77 has a plurality of air intake holes 18, and an air flow path is formed between the projection side block 80 and the housing side plate so that the upper portion is in contact with the upper surface plate 11 of the housing. The front end of the air flow path forming plate is located behind the front end of the projection side block 80, has an air inlet 94 in front of the air flow path forming plate, Between the projection side block 80, there is an illumination side block partition wall 127, and an air flow surrounded by the air flow path forming plate, the illumination side block partition wall 127, the lens barrel cover 92, and the upper surface plate 11 of the housing. It is equipped with a road.

  Then, the optical system unit 77 illuminates the on-state light beam by irradiating the display element 51 with the illumination-side block 78 that guides the light from the light source and reflecting the light through the illumination-side block 78 to the display element 51. The image generation block 79 for generating the on-state light and the projection-side block 80 for enlarging and projecting the on-state light beam by the projection-side optical system 62. It is what has been broken.

  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.
Further, the right side plate 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. 1 are provided with a plurality of intake holes 18 for taking in outside air when the inside of the casing is cooled. is there.

  As shown in FIG. 2, the projector control means 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, and the like. The image signals of various standards input from the connector unit 21 are converted so as to be unified 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). Thereafter, it is 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 of the light source device, and the cooling fan drive control circuit 43 The temperature is detected 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 or the like. 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.

  The internal structure of the projector 10 is arranged in the vicinity of the blower 110 using the control circuit board 103 as a cooling fan, and the power supply control circuit board 102 to which the lamp power circuit block 101 and the like are attached is arranged in the vicinity of the right side plate 14. The intake side space chamber 121 on the back plate 13 side and the exhaust side space chamber 122 on the front plate 12 side are partitioned by a partition wall 120 in the housing to form an airtight space between the intake side space chamber 121 and the intake side space chamber 121. In addition, a sirocco fan type blower 110 is arranged as a cooling fan on the bottom plate in the vicinity of the back plate 13, and a discharge port 113 of the blower 110 is arranged in the exhaust side space chamber 122.

  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.

  The optical system unit 77 includes three blocks including an illumination side block 78, an image generation block 79, and a projection side block 80 located in the vicinity of the light source device 63, as shown in FIGS. It is configured.

The illumination side block 78 is provided with 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 to provide a wheel motor 73. And a light tunnel 75 that converts the light transmitted through the filter of the color wheel 71 into a light beam having a uniform intensity distribution. 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 illumination-side block partition wall 127 is located between the illumination-side block 78 and the projection-side block 80, and the upper end is in contact with the upper surface plate 11.

  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 behind the display element 51.

  Further, as shown in FIG. 6, the projection-side block 80 has a lens group of the projection-side optical system 62 that emits light reflected by the display element 51 to form an image to the screen. 62 is composed of a fixed lens group 96 built in the fixed lens barrel and a movable lens group 97 built in the movable lens barrel, and is a variable focus type lens having a zoom function. The group 97 is moved to enable zoom adjustment and focus adjustment.

  Further, the projection side block 80 has a substantially rectangular shape with a cross section perpendicular to the optical axis, the central upper portion projects in an arc shape so as to cover the upper peripheral edge of the lens, and the projection side optical block 80 is centered on the projection side block 80. A lens group of system 62 is arranged. A movable mechanism for moving the movable lens group 97, a lens fixing member, and the like are disposed on both sides of the central projection-side optical system. The upper part of the projection side block 80 is covered with a lens barrel cover 92 in which a cooling heat sink 91 is formed in parallel with the optical axis on the entire upper surface.

  Further, between the optical system unit 77 and the left side plate 15, there is an optical system control board 86 for controlling the zoom and focus adjustment of the projection side optical system, and this optical system control board 86 is a movable lens barrel or a movable lens. By controlling the operation of the group 97, a zoom function and focus adjustment can be performed. Further, the upper end of the optical system control board 86 is in contact with the upper surface plate 11, and the front end portion of the projection side block 80 projects forward from the front end portion of the optical system control board 86.

An air flow path is formed above the projection side block 80 between the optical system control board 86 and the illumination side block partition wall 127, the lens barrel cover 92, and the upper surface plate 11, and the front end portion of the optical system control board 86. An air inflow port 94 is formed further forward. As a result, the outside air that has flowed in from the intake hole 18 of the left side plate 15 can flow into the upper part of the lens barrel cover 92 only from the air inlet 94 near the front of the projection side block 80. That is, the optical system control board 86 functions as an air flow path forming plate that forms an air flow path above the lens barrel cover 92 and allows air to flow above the lens barrel cover 92.
The outside air that has flowed into the lens barrel cover 92 from the front side of the projection side block 80 serving as the air inlet 94 flows along the heat sink 91 to cool the projection side block 80.

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 by 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 such as aluminum, which is light in weight and high in heat conduction, and the heat of the illumination side block 78 is radiated to the outside.

  The light source device 63 includes a reflector that is a rotating body having an inner surface as a reflecting surface and a substantially semi-elliptical cross section, and a high-intensity discharge lamp that uses halogen or the like built in the reflector.

  The blower 110 as a cooling fan for cooling the light source device 63, the optical system unit 77, various substrates and the like has a suction port 111 in the center as shown in FIG. 3, and the discharge port 113 has a substantially square shape. The cross section is connected to the partition wall 120 and the illumination side block partition 127, and exhaust air from the blower 110 is discharged to the exhaust side space 122 partitioned by the partition wall 120 and the illumination side block partition 127. A control circuit board 103 is disposed in the vicinity of the suction port 111 of the blower 110.

  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.

  The partition wall 120 is composed of a plate-like first partition wall 123 and a second partition wall 124, and an upper partition plate 126 covers the upper part of the exhaust side space chamber 122 in an airtight manner.

  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. Yes, it is obliquely inclined at an arbitrary length from the discharge port 113 of the blower 110 toward the back plate 13 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 arbitrarily inclined forward and diagonally from the discharge port 113 of the blower 110. The length is obliquely extended, extends from this end to the right side plate 14 in parallel with the front plate 12 toward the right side plate 14, and finally connected to the front plate 12 from this end in parallel to the right side plate 14. It is a saddle shape. The shape of the second partition 124 is for dispersing the hot exhaust gas in the exhaust-side space chamber 122 over the entire front plate 12.

  The upper partition plate 126 covers the entire upper portion of the exhaust-side space chamber 122, is formed in substantially the same shape as the upper portion of the exhaust-side space chamber 122, and is disposed between the upper surface plate of the projector housing. It is arranged with a space.

  Further, as shown in FIG. 4, an exhaust temperature reducing device 114 that reduces the exhaust temperature in the exhaust side space chamber 122 and releases it to the outside is provided near the front plate 12 in the exhaust side space chamber 122. The exhaust temperature reducing device 114 is a heat conductive member. In this embodiment, the exhaust temperature reducing device 114 is a heat conductive member having a capillary structure on the inner wall and a metal pipe having a vacuum inside sealed with a working fluid such as pure water or perfluorocarbon. These heat pipes and a plurality of fins are used, and are arranged in the vicinity of the front plate 12 in parallel with the front plate 12.

The exhaust temperature reduction device 114 has a shape in which a plurality of fins that are plate-like bodies are arranged in parallel, and a plurality of fins are connected through a long rod-like heat conduction member passing through substantially the center of the fin. That is, the heat conducting member is in a plate shape and is in contact with the plate surface of the plurality of fins.
By attaching the fins to the heat conducting member in this manner, the heat absorbed by the fins can be released to the heat conducting member, and the entire exhaust temperature reducing device can be kept at a uniform temperature.

  Next, the flow of air in the projector 10 will be described. As shown in FIG. 7, when the fan of the blower 110 is rotated, the blower 110 serving as a cooling fan sucks ambient air from the suction port 111 and sucks air around the blower 110 inside the projector 10. Outside air can be sucked into the inside of the projector 10 from a large number of intake holes 18 provided in the side plate of the housing.

  The back plate 13 is provided with an intake hole 18 at a rear portion of the place where the display element 51 is located, and an air flow path is formed between the back plate 13 and the optical system unit 77 having the display element 51, thereby Outside air sucked from the intake holes 18 provided in the face 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.

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

  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 123 and is sucked into the suction port 111 of the blower 110.

  A part of the outside air sucked from the intake hole 18 of the left side plate 15 flows along the optical system control board 86 in front of or behind the optical system control board 86, and the outside air that flows in front of the optical system control board 86 is The projection side optical system flows into the lens barrel cover 92 from the air inlet 94 and passes the air flow path between the optical system control board 86 and the illumination side block partition wall 127 along the heat sink 91 toward the image generation block 79. 62 flows while cooling, and then flows in the vicinity of the image generation block 79 and the illumination side block 78 and flows into the suction port 111 of the blower 110 while cooling.

  Further, the outside air that flows behind the optical system control board 86 flows into the image generation block 79 from the rear end of the optical system control board 86, and flows into the suction port 111 of the blower 110 while cooling the periphery of the image generation block 79. Is.

  The other part of the outside air sucked from the intake hole 18 of the left side plate 15 flows into the lower side of the projection side block 80, and after cooling the projection side block 80 from the lower side, flows around the periphery of the image generation block 79. Then, the air flows into the suction port 111 of the blower 110.

  Then, the exhaust of the blower 110 blown into the exhaust side space 122 flows partly along the color wheel 71, and mostly flows around the light source device 63 that has become hot, while cooling the light source device 63. It flows into the exhaust temperature reducing device 114, is cooled, and is discharged from the exhaust hole 17 provided in the front plate 12.

  According to the present embodiment, the lens barrel cover 92 having the heat sink 91 on the surface is formed on the projection side block 80, and the air flow between the optical system control board 86, the illumination side block partition wall 127, and the upper surface plate 11 is achieved. By forming the path, the area in contact with the outside air flowing on the projection side block 80 is widened and the fluid resistance is increased, thereby increasing the cooling efficiency of the projection side optical system 62. It is possible to prevent the projection image from fluctuating and defocusing, and the bonded lens from being peeled off or damaged due to the difference in thermal expansion coefficient.

  Next, a modified example of the lens barrel cover 92 will be described. As shown in FIG. 8, the lens barrel cover 92 has a heat sink 91 on the entire surface, and a rectifying wall that divides the vicinity of the high-temperature light source, the high-temperature portion located above the projection-side optical system, and the low-temperature portion. 93.

  The rectifying wall 93 is located at the outer end of the projection-side optical system 62 disposed inside the projection-side block 80, and is formed from the vicinity of the image generation block 79 toward the front in parallel with the optical axis, at a predetermined position. From the air to the vicinity of the air inlet 94. Further, the upper part of the rectifying wall 93 is in contact with the upper surface plate 11 to prevent the outside air flowing on the heat sink 91 from flowing from the high temperature part side to the low temperature part or from the low temperature part side to the high temperature part.

  Further, at the end of the rectifying wall 93, a large amount of air flows into the vicinity of the illumination side block 78 and the projection lens group that become high temperature, and a small amount of air flows into the vicinity of the left side plate 15 that becomes low temperature. The air inlet 94 is divided into a high temperature portion side inlet and a low temperature side inlet, so that the size of the inlet of the air inlet 94 is different.

  The front end of the heat sink 91 projects from the front end of the optical system control board 86 located behind the front end of the projection side optical system 62 to the top of the front end of the projection side optical system 62 on the illumination side block 78 side. It is arranged so as to be cut obliquely at the front end of the side block 80, and is formed so that the inflow of outside air from the air inlet 94 is easy and reliable in the air flow path.

  In this way, by forming the rectifying wall 93 on the surface of the lens barrel cover 92 and partitioning it on the high temperature side and the low temperature side, a large amount of air flows into the high temperature side, which requires a large amount of air to cool, A small amount of air will flow into the low temperature side, and the cooling efficiency can be increased.

  Further, as shown in FIG. 9, the vicinity of the air inlet 94 of the heat sink 91 located on the projection-side optical system may be inclined to the air inlet 94 side. By forming in this way, the outside air can easily flow into the projection side optical system that needs to be cooled most, so that the cooling efficiency can be increased.

  As yet another modification, as shown in FIG. 10, a rectifying wall 93 is formed on both side ends of the lens barrel cover 92 on the projection side optical system, and a heat sink 91 is formed only between the rectifying walls 93. There is also. The vicinity of the air inlet 94 of the rectifying wall 93 and the heat sink 91 is formed to be inclined toward the air inlet 94.

  By forming the heat sink 91 only on the projection side optical system in this way, a large amount of outside air flows into the projection side optical system that needs to be cooled most, and the heat sink 91 can improve the cooling efficiency.

  Although the optical system control board 86 is an air flow path forming plate, it is naturally possible to arrange an air flow path forming plate separately. Further, instead of disposing the air flow path forming plate, the heat sink 91 positioned at the side end of the lens barrel cover 92 is formed so as to be in contact with the upper surface plate 11 of the housing, and the air is formed above the lens barrel cover 92. It is also possible to form a flow path.

  In the present embodiment, a plurality of air intake holes are formed in the left side plate 15 of the projector housing, but one air intake hole 18 is provided in the vicinity of the front end, and the lens barrel cover 92 is formed from the one air intake hole 18. When the outside air is allowed to flow into the upper part of the left side plate 15 and a plurality of intake holes 18 are provided on the upper and lower sides of the left side plate 15, the outside air that has flowed in from above is caused to flow into the lens barrel cover 92. It is also possible to adopt a configuration of flowing.

  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. 3 is a partially cutaway top view of the projector according to the embodiment of the invention. Sectional drawing of the light source unit which concerns on the Example of this invention. FIG. 4 is a top view of the projector according to the embodiment of the present invention with the top plate showing the air flow removed. The top view which removed the upper surface board of the projector which concerns on the modification of this invention. The top view which removed the upper surface board of the projector which concerns on the other modification of this invention. The top view which removed the upper surface board of the projector which concerns on another modification of this invention.

Explanation of symbols

10 Projector
11 Top plate 12 Front plate
13 Back plate 14 Right 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 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 91 Heat sink
92 Tube cover 93 Rectifier wall
94 Air inlet 96 Fixed lens group
97 Movable lens group 101 Lamp power circuit block
102 Power supply control circuit board 103 Control circuit board
110 Blower 111 Air inlet
113 Discharge port 114 Exhaust temperature reduction device
120 Partition wall 121 Inlet side space
122 Exhaust side space 123 First partition
124 2nd partition wall 126 Upper partition plate
127 Bulkhead for lighting side block

Claims (7)

A light source device ;
An optical system unit including an optical system, a display element, and the like;
A control circuit board provided with a projector control means,
The optical system unit is:
An illumination side block which guides light from the light source device, an image generation block having a picture image generator that generates an image light in the display device by irradiating the display element light through the illumination side block When formed by a projection side block with projecting shadow lens you enlarge and project the image light by the projection side optical system,
The projection side block is covered top by barrel cover Ru provided with a heat sink on the top surface,
The lens barrel cover includes a rectifying wall that divides an upper portion of the lens barrel cover into an upper portion of the projection side optical system and a side portion of the projection side optical system . The baffle wall, the arranged parallel to the optical axis of the projection side optical system, a projection direction of the distal end portion of the rectifying wall that bisects the outside air refracted toward the outside air flows, flows The projector according to claim 1 . Projection direction of the distal end portion of the heat sink formed on the projection side optical system, projector according to claim 1 or claim 2, characterized in that it is refracted in a direction in which outside air flows. The lens barrel cover has an upper rectifying wall of each side of the projection side optical system, any of claims 1 to 3, characterized in that the heat sink between the baffle wall is formed A projector according to any one of the above. A side plate of the housing in the vicinity of the optical system unit has a plurality of air intake holes, and an air flow path forming plate is provided between the projection side block and the side plate of the housing so that the upper portion is in contact with the upper surface plate of the housing. And
The front end of the air flow path forming plate is located behind the front end of the projection side block, and has an air inflow port in front of the air flow path forming plate,
The illumination side block is arranged with the optical axis of the illumination side block and the optical axis of the projection side block in parallel,
Between the illumination side block and the projection side block, there is an illumination side block partition,
Wherein the air flow path forming plate, the illumination side block for partition walls, one of claims 1 to 4, characterized in that it comprises an air flow path surrounded by the upper plate of the barrel cover and the housing Projector. 6. The projector according to claim 5 , further comprising an optical system control board, wherein the optical system control board is an air flow path forming plate. An illumination side block for guiding light from the light source, an image generation block for generating image light by the display element by irradiating the light through the illumination side block to the display element, and image light by the projection side optical system It is formed with a projection-side block that magnifies and projects,
The projection side block is covered at the top by a lens barrel cover having a heat sink on the upper surface ,
The lens barrel cover has an rectifying wall that divides an upper portion of the lens barrel cover into an upper portion of the projection side optical system and a side portion of the projection side optical system. unit.

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