JP2008111898A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin projector having a projection angle adjustment device without needing wide storage space. <P>SOLUTION: The data projector is incorporated with a light source device 63 and a cooling fan. The light source device 63 is disposed in the front of the housing of the projector. A light source lower cover 12 located below the light source device 63 can be opened or closed around its rear end serving as a rotation axis. The light source lower cover 12 has approximately triangular side walls at both left and right ends of a cover main body, which is a rectangular thin plate. The light source lower cover 12 has an engagement part 23 in part of the side wall, and also an opening/closing device 15 having a member the leading end of which can be engaged with the engagement part 23. Thus, the opening/closing angle of the light source lower cover 12 is adjusted and fixed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projector having a projection angle adjusting device.

  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.

  Many of such data projectors can adjust the projection angle by providing a projection angle adjusting device at the bottom of the housing. For example, in Japanese Patent Laid-Open No. 10-322036 (Patent Document 1), a projection angle is changed by rotating a screw knob provided on the bottom of the projector to change the length of the screw protruding from the bottom of the projector. An invention to adjust has been proposed.

In Japanese Patent Application Laid-Open No. 2004-054039 (Patent Document 2), a projection angle adjusting device is installed at the bottom of the projector housing, and a button provided on the top is pressed to support height adjustment from this adjusting mechanism. There has been proposed a projector in which a member protrudes and a support member is fixed when the button is released when the member is adjusted to an arbitrary height, and projection is possible at a height at which the button is released.
Japanese Patent Laid-Open No. 10-322036 JP 2004-054039 A

  However, in the conventional projector as described above, since the projection angle adjusting device is provided exclusively, it is necessary to store the mechanism inside the projector, and the projector needs extra space for storing the projection angle adjusting device. It was an obstacle to thinning and downsizing.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a thin projector having a projection angle adjusting device that does not require a large space for storage.

  The projector (1) of the present invention is a data projector including a light source device (63) and a cooling fan, and has the light source device (63) in the front of the projector housing and below the light source device (63). The light source lower cover (12) positioned in the position can be opened and closed with the rear end as a pivot axis.

  The light source lower cover (12) has a substantially triangular side wall at both left and right ends of a rectangular thin plate cover body, and has an engaging portion (23) at a part of the side wall, and the engaging portion (23 ) Has an opening / closing control device (15) provided with a member engageable at its tip, and the opening / closing angle of the light source lower cover (12) can be adjusted and fixed.

  Further, the open / close control device (15) is connected to the open / close button (13), a push spring (16) disposed on the back surface of the open / close button (13), and the end of the open / close button (13). A first interlocking shaft (17) that slides in conjunction with the movement of the open / close button (13), and a shaft sliding hole that connects to the end of the first interlocking shaft (17) and slides the cam shaft in the center. The formed cam plate (18) and the second interlocking shaft (connected to the end of the cam plate (18) and the other end engaged with the engaging groove of the engaging portion (23) of the light source lower cover (12) ( 19).

  The cooling fan is disposed behind the light source device (63), and the casing has an intake side space chamber (121) in which the cooling fan is disposed and an exhaust side space chamber in which the light source device (63) is disposed ( 122) and has an exhaust hole (8) in the front plate (3) of the housing.

  In addition, a lamp lower exhaust plate (131) is provided at the lower part of the light source device (63), and the lamp lower exhaust plate (131) is a lower surface plate (133) having a slightly smaller square shape than the light source lower cover (12). The lower plate (133) has a front plate (134) rising from the front end, and the lower plate (133) and the front plate (133) have through holes (135).

  According to the present invention, it is possible to provide a thin projector having a projection angle adjusting device that does not require a large space for storage.

  The projector 1 according to the best mode for carrying out the present invention is a data projector including a light source device 63 and a cooling fan, and has the light source device 63 in the front inside the housing of the projector, below the light source device 63. The light source lower cover 12 positioned in the position can be opened and closed with the rear end as a rotation axis.

  The light source lower cover 12 has a substantially triangular side wall at the left and right ends of a rectangular thin plate cover body, an engaging portion 23 at a part of the side wall, and a distal end engaged with the engaging portion 23. The light source lower cover 12 has an open / close control device 15 having possible members, and the open / close angle of the light source lower cover 12 can be adjusted and fixed.

  Further, the opening / closing control device 15 is connected to the opening / closing button 13, the push spring 16 disposed on the back surface of the opening / closing button 13, and the end of the opening / closing button 13 connected to the opening / closing button 13, in conjunction with the movement of the opening / closing button 13. The first interlocking shaft 17 that slides, the cam plate 18 that is connected to the end of the first interlocking shaft 17 and has a shaft sliding hole in which the cam shaft slides in the center, and the end of the cam plate 18 The other end includes a second interlocking shaft 19 that engages with the engaging groove of the engaging portion 23 of the light source lower cover 12.

  The cooling fan is disposed behind the light source device 63, and the housing is partitioned into an intake side space chamber 121 in which the cooling fan is disposed and an exhaust side space chamber 122 in which the light source device 63 is disposed. The front plate 3 has an exhaust hole 8.

  Further, a lamp lower exhaust plate 131 is provided at the lower part of the light source device 63. The lamp lower exhaust plate 131 has a rectangular lower surface plate 133 slightly smaller than the light source lower cover 12 and a front rising from the front end of the lower surface plate 133. The bottom plate 133 and the front plate 134 have through holes 135.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the projector housing according to one embodiment of the present invention has a substantially rectangular parallelepiped shape, and has an upper surface opening composed of a front plate 3, a right plate 5, a left plate, a back plate, and a bottom plate. A lower case having a round shape at the corners and a top plate 2 covering the upper side of the lower case.

  A projection port 10 is provided on the side of the front plate 3, and a plurality of exhaust holes 8 are provided in the front plate 3, so that the light in the housing does not leak outside the exhaust holes 8. The louver 11 is provided.

  The top plate 2 is provided with a key / indicator section 40. The key / indicator section 40 has a power switch key, a power indicator for notifying power on / off, and a lamp for lighting a lamp of the light source device. A key and an indicator such as a switch key, a lamp indicator for displaying lamp lighting, and an overheat indicator for notifying when the light source device is overheated are provided.

Further, on the back of the main body case (not shown), a control signal from a power supply adapter plug or a remote controller, and an input / output connector part provided with a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, etc. on the back plate Is provided with an Ir receiving unit or the like.
The right side plate 5 and the left side plate (not shown) are each provided with a plurality of intake holes 9.

  In addition, as shown in FIG. 2, the bottom plate 7 has two legs 27 at both corners on the back plate 4 side, and a bulging portion 21 is formed from a position away from the right plate 5 to a left plate by a predetermined distance. Has been. Further, a lamp outlet 132 is formed in the vicinity of the corner on the front plate 3 and right side plate 5 side of the bulging portion 21, and a light source lower cover 12 that covers the lamp outlet 132 is provided.

  An opening / closing control device storage portion 22 for storing an opening / closing control device, which will be described later, is formed by bulging from the bottom plate 7 from the lamp outlet 132 to the right side plate 5, and the right side plate 5 of the opening / closing control device storage portion 22 is formed. An opening / closing button 13 for controlling opening / closing of the light source lower cover 12 is disposed at the side end.

  A shaft fixing portion 14 is formed at both ends of the lamp outlet 132 on the back plate side. The light source lower cover 12 can be rotated by attaching a cover shaft (not shown) to the shaft fixing portion 14. ing. The light source lower cover 12 and the two legs 27 support the projector 1 at three points, and have a function of adjusting the projection angle of the projector 1. A detailed description of the light source lower cover 12 will be described later.

  As shown in FIG. 3, the projector control means of the projector 1 includes a control unit 41, an input / output interface 32, an image conversion unit 33, a display encoder 34, a display drive unit 35, etc. The image signals of various standards input from the connector unit 31 are converted so as to be unified into image signals of a predetermined format suitable for display by the image conversion unit 33 via the input / output interface 32 and the system bus (SB). Thereafter, it is sent to the display encoder 34.

  The display encoder 34 develops and stores the transmitted image signal in the video RAM 44, generates a video signal from the stored contents of the video RAM 44, and outputs the video signal to the display drive unit 35.

  A display driver 35 to which a video signal is input from the display encoder 34 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. The movable lens group 97 in the projection system lens group is driven for zoom adjustment and focus adjustment by the lens motor 45.

  In addition, the image compression / decompression unit 36 performs recording processing such as sequentially writing the luminance signal and color difference signal of the image signal to a memory card 37 that is a removable recording medium by compressing the data by processing such as ADTC and Huffman coding. In the mode, the image data recorded in the memory card 37 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 34 via the image conversion unit 33. A moving image or the like can be displayed based on the stored image data.

  The control unit 41 controls operation of each circuit in the projector 1, 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 40 composed of the main key and the indicator provided on the upper surface plate 2 of the main body case is directly sent to the control unit 41, and the key operation signal from the remote controller is received by Ir. The code signal received by the unit 38 and demodulated by the Ir processing unit 39 is sent to the control unit 41.

  An audio processing unit 47 is connected to the control unit 41 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 in the projection mode and the reproduction mode. The speaker 48 can be driven to emit loud sounds.

  The control unit 41 controls the power supply control circuit 42. When the lamp switch key is operated, the power supply control circuit 42 turns on the lamp of the light source device 63, and the cooling fan drive control circuit 43 The temperature is detected by a temperature sensor provided in the light source device 63 or an exhaust side space chamber, which will be described later, and the rotation speed and the number of rotations of the cooling fan are controlled, and the light source device 63 is turned off by a timer or the like. This also keeps the cooling fan rotating.

  These ROM, RAM, IC and circuit elements are attached to the control circuit board 103 as the main control board shown in FIG. 4, and the power system power control circuit 42 is incorporated in the lamp power 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.

  Further, as shown in FIGS. 4 and 5, the internal structure of the projector 1 is such that a power control circuit board 102 with a lamp power circuit block 101 and the like mounted thereon is disposed in the vicinity of the right side plate 5, and the inside of the housing is partitioned. 120, an air intake side space chamber 121 on the back plate 4 side and an air exhaust side space chamber 122 on the front plate 3 side are formed in an airtight manner, and a sirocco fan type blower 110 is used as a cooling fan in the air intake side space chamber 121. It is arranged on the bottom plate in the vicinity, and the discharge port 113 of the blower 110 is arranged in the exhaust side space chamber 122.

  Further, the light source device 63 is disposed in the exhaust side space 122, and the optical system unit 77 is disposed along the left side plate 6. The illumination side block 78, the image generation block 79, and the projection side block 80 are configured. The illumination-side block 78 of the optical system unit 77 to be opened is communicated with the exhaust-side space chamber 122 so that a part of the optical system unit 77 is positioned in the exhaust-side space chamber 122. Further, an exhaust temperature reducing device 114 is disposed in the vicinity of the front plate 3.

  This optical system unit 77 is composed of 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. As shown in FIG. 5, 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 are provided around and rotated by a wheel motor 73. And a light tunnel 75 as an integrator rod 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 image generation block 79 includes a second reflection mirror 74 that changes the direction of the light emitted from the light tunnel 75 by 90 degrees, and a plurality of sheets that collect the light reflected by the second reflection mirror 74 on the display element 51. The light source side lens group 83 formed by the lens and the light transmitted through the light source side lens group 83 are irradiated on the display element 51 at a predetermined angle from a front obliquely lower side, reflected by the irradiation mirror 84 and reflected on the display element 51. A DMD (digital micromirror device) serving as the display element 51, a display element unit for holding the display element 51, etc. It has.

  The DMD reflects light incident from the front obliquely lower side by dividing the light into an on-state light beam reflected in the front direction and an off-state light beam reflected obliquely upward by switching the tilt directions of the plurality of micromirrors. The image is displayed, and the light incident on the micromirror tilted in one tilt direction is turned into an on-state light beam reflected in the front direction by this micromirror, and incident on the micromirror tilted in the other tilt direction. The light is reflected obliquely upward by this micromirror to form an off-state light beam, and this off-state light beam is irradiated toward the upper surface of the image generation block 79 without being incident on the entrance of the projection-side optical system 62. An image is generated and displayed by an on-state light beam reflected in a direction.

  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 built into the lens and a movable lens group built into the movable lens barrel, and is a variable focus type lens with a zoom function. Adjustment is possible.

  In addition, an optical system control board 86 for controlling zoom and focus adjustment of the projection side optical system is disposed between the optical system unit 77 and the left side plate 6. By controlling the operation of the movable lens group, a zoom function and focus adjustment can be performed.

  The blower 110 has a suction port 111, and the discharge port 113 has a substantially square cross section and is connected to the partition wall 120, and is partitioned by the partition wall 120 and the illumination side block partition 127 of the illumination side block 78. Exhaust air from the blower 110 is discharged into the exhaust-side space chamber 122, and a control circuit board 103 is disposed in the vicinity of the suction port 111 of the blower 110.

  In addition, the partition wall 120 is close to the intake side space chamber 121 in which relatively low temperature devices such as various optical systems and various substrates are arranged, and to a high temperature device such as the light source device 63 and the light source device 63. Are divided into an exhaust-side space chamber 122 in which a light source unit such as a first reflecting mirror 72 and a color wheel 71 are arranged.

  Further, as shown in FIG. 5, the light source device 63 disposed in the exhaust-side space chamber 122 is provided with an ultrahigh pressure mercury lamp as a discharge lamp 64 inside a reflector 65 whose front surface is covered with explosion-proof glass. . As shown in FIG. 6, a lamp lower exhaust plate 131 for preventing heat from the light source device 63 from being directly transmitted to the housing is disposed below the light source device 63, and the light source device 63 of the bottom plate 7 is disposed. A lamp take-out port 132 for replacing the lamp is formed at a position where is located, and a light source lower cover 12 that covers the lamp take-out port 132 is further disposed.

  The lamp lower exhaust plate 131 includes a bottom plate 133 that is a rectangular thin plate in which a plurality of through holes 135 are formed, and a front plate 134 that rises vertically from the front end of the bottom plate 133 and that has a plurality of through holes 135 formed therein. It is formed from. Further, the lamp lower exhaust plate 131 is fixed to the projector housing by a fixing screw 136 so as to form a slight gap between the lower end of the light source device 63.

  Further, as shown in FIG. 7, the light source lower cover 12 includes a cover main body that is a rectangular thin plate having substantially the same shape as the lamp outlet 132, and two substantially triangular side walls that rise vertically from the left and right ends of the thin plate. The two side walls have a shaft fixing portion that is formed so as to extend in the vicinity of the front end portion so as to extend the side wall, and has a shaft hole through which the cover shaft is inserted. A fan-shaped engagement portion 23 having a plurality of engagement grooves is formed in the vicinity of the front end portion of the side wall with the front end of the side wall as a center, and protrudes forward on one side wall not having the engagement portion 23. A knob protrusion 24 is provided. Since the central angle of the engaging portion 23 is larger than the tip angle of the side wall, a part of the engaging portion 23 has a shape protruding from the bottom of the side wall. A flange portion is formed at the lower end of the engaging portion 23, so that a second interlocking shaft 19 to be described later is hardly detached from the engaging portion 23.

  Further, as shown in FIG. 8, an opening / closing control device 15 for controlling the opening / closing angle of the light source lower cover 12 is disposed near the bottom plate 7 between the light source lower cover 12 and the right side plate 5. The open / close control device 15 includes an open / close button 13, a push spring 16 that is disposed between the back surface of the open / close button 13 and a protrusion in the projector housing and returns the pressed open / close button 13, and an end of the open / close button 13. The first interlocking shaft 17 that slides in parallel with the front plate 3 in conjunction with the movement of the open / close button 13 and the shaft sliding that connects with the end of the first interlocking shaft 17 and the cam shaft penetrates through the center. A cam plate 18 having a hole, and a second interlocking shaft 19 that is connected to the end of the cam plate 18 and whose other end engages with the engaging groove of the engaging portion 23 of the light source lower cover 12 is provided. .

  In the opening / closing control device 15, when the opening / closing button 13 is pressed, the end of the cam plate 18 connected to the first interlocking shaft 17 is pulled by sliding the first interlocking shaft 17, and the cam plate 18 The end connected to the second interlocking shaft 19 moves in the opposite direction to the end connected to the first interlocking shaft 17 by sliding the periphery of the cam shaft through the shaft sliding hole, and the second interlocking The shaft 19 is pulled by the cam plate 18 and slides in the direction opposite to the operation direction of the first interlocking shaft 17, whereby the engagement with the engagement portion 23 is released. As a result, the light source lower cover 12 is rotatable.

  When the opening / closing button 13 is released, the push spring 16 extends to return the opening / closing button 13, so that the first interlocking shaft 17, the cam plate 18, and the second interlocking shaft 19 also return in conjunction with each other. The front end of the light source engages with the unevenness of the engaging part 23 of the light source lower cover 12, and the light source lower cover 12 is fixed. If the end of the second interlocking shaft 19 exceeds the flange formed at the lower end of the engaging portion 23, the tip of the second interlocking shaft 19 is the light source lower cover as shown in FIG. Since the light source lower cover 12 can be opened and closed freely, the openable angle of the light source lower cover 12 is not less than vertical. By removing the fixing screw 136, the lamp lower exhaust plate 131 is removed, and the light source device 63 can be replaced.

  Further, when the light source lower cover 12 is closed by the light source lower cover 12, the exhaust is discharged to the outside through a through hole 135 formed in the front plate 134 of the lamp lower exhaust plate 131, and the light source lower cover 12 is When it is open, it is discharged from the through hole 135 of the front plate 134 and exhaust is also discharged from the through hole 135 formed in the lower surface plate 133 of the lamp lower exhaust plate 131, and the exhaust discharged from this lower surface plate 133 Is a device that flows forward along the light source lower cover 12 and is discharged to the outside, and prevents exhaust air from hitting the upper surface of a table or the like on which the projector 1 is placed.

  When the projector 1 is disposed horizontally, as shown in FIG. 9, the light source lower cover 12 and the two legs 27 are held horizontally by placing the light source lower cover 12 in a closed state, When placing the projector at an angle, open the light source lower cover 12 by lowering the knob projection 24 of the light source lower cover 12 while pressing the open / close button 13, release the open / close button 13 at a predetermined height, and remove the light source lower cover 12. By fixing, as shown in FIG. 10, the projector casing is held in an inclined state by the two legs 27 and the open light source lower cover 12.

  In addition, a plurality of temperature sensors are disposed in and near the exhaust side space chamber 122, and the number of rotations of the blower 110 serving as a cooling fan is controlled according to the temperature of the exhaust side space chamber 122. When the cover 12 is in the open state, the temperature of the exhaust side space 122 is lowered, so that the rotational speed of the blower 110 is lowered, and the noise is thereby reduced.

  The exhaust temperature reduction device 114 disposed in the exhaust side space 122 is a heat conductive member, and in this embodiment, the inner wall has a capillary structure and the inside is a vacuumed metal pipe that operates pure water, perfluorocarbon, etc. The heat pipe 115 in which the liquid is sealed and the fins 116 are used, and are arranged between the exhaust hole 8 formed in the projector casing and the light source device 63 which is a high-temperature heat generation source. The exhaust temperature reducing device 114 is disposed over the entire surface of the exhaust hole 8.

  The exhaust temperature reducing device 114 has a structure in which a heat pipe 115, which is a long bar-like heat conducting member, is formed in a plate shape and penetrates through the center of a plurality of fins 116. The fin 116 has a dogleg shape refracted toward the right side plate 5 in the middle.

By attaching the fin 116 to the heat pipe 115 in this way, the heat absorbed by the fin 116 is released to the heat pipe 115 in the high temperature portion, and the heat of the heat pipe 115 is released to the outside through the fin 116 in the low temperature portion. As a result, the exhaust temperature reducing device 114 can be maintained at a uniform temperature. And in any different place of the exhaust temperature reducing device 114, the air discharged from the cooling fan, the air passing through the interior of the light source device 63 which is a high-temperature heat source, or the air passing through the space slightly away from the light source device 63, etc. Since air of different temperatures is hit, heat is absorbed by the fins 116 that are exposed to high-temperature air, and heat is dissipated by the fins 116 that are exposed to low-temperature air.
Further, since the fins 116 are attached so as to be inclined toward the right side plate 5, the exhaust does not flow to the projection port 10, and image fluctuations can be prevented.

  Next, the flow of air in the projector 1 will be described. As shown in FIGS. 4 and 5, the back plate 4 is provided with an intake hole 9 in the rear portion of the place where the display element 51 is located, and between the back plate 4 and the optical system unit 77 having the display element 51. An air flow passage is formed so that outside air sucked from the intake holes 9 provided in the back plate 4 and the intake holes 9 provided behind the left side plate 6 flows in the direction of the blower 110 along the back plate 4.

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

  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 1, so that the side plate of the casing of the projector 1 The outside air can be sucked into the projector 1 from a large number of intake holes 9 provided in the projector 1.

  Then, a part of the outside air sucked from the suction holes 9 provided in the left side plate 6 and the back plate 4 flows through the air flow path between the back plate 4 and the optical system unit 77 so as to cool the display element heat sink. Then, the air 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 along the control circuit board 103. The other outside air sucked from the suction hole 9 of the left side plate 6 cools the optical system unit 77.

  In addition, the outside air sucked into the projector 1 from the intake hole 9 of the right side plate 5 partially reaches the control circuit board 103 while cooling the power supply control circuit board 102 through the periphery of the lamp power supply circuit block 101 and the like. The air flows along the control circuit board 103 and is sucked into the suction port 111 of the blower 110. The remaining sucked outside air flows along the partition wall 120 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. In addition, a part of the air flowing around the light source device 63 flows from the opening provided in the reflector 65 so as to pass through the inside of the reflector 65, and the other part is in the vicinity of the first reflecting mirror 72, the color wheel 71, and the like. Then, each part of the light source unit is cooled together with the light source device 63.

  Further, when the light source lower cover 12 is closed, the exhaust gas flowing under the light source device 63 is guided to the through hole 135 of the lamp lower exhaust plate 131 while cooling the light source device 63 as shown in FIG. Then, it flows in the direction of the front plate 3 and is discharged to the outside through the exhaust hole 8 of the front plate 134.

  When the light source lower cover 12 is open, as shown in FIG. 12, the exhaust is discharged to the outside through the exhaust hole of the lamp lower exhaust plate 131 and the exhaust is emitted from the through hole 135 of the lamp lower exhaust plate 131. The liquid flows through the lower cover 12 and is discharged along the light source lower cover 12 in the forward direction of the projector 1.

  Further, the high-temperature air after cooling the light source device 63 and the color wheel 71 in the exhaust-side space chamber 122 spreads over the entire front plate 3 of the exhaust temperature reducing device 114 and from the exhaust holes 8 provided in the front plate 3. It is discharged by the outside.

  According to the present invention, the projection angle can be adjusted by using the light source lower cover 12 as one of the legs of the projector 1 and adjusting the opening / closing angle of the light source lower cover 12, so that the projection angle It is not necessary to provide an adjustment mechanism separately, and an extra space in the projector housing can be deleted.

  Further, since the projection can be performed with the light source lower cover 12 opened, an exhaust port for exhausting the cooling exhaust is located immediately below the light source device 63 that is at the highest temperature, thereby reducing the temperature inside the projector housing. Can be further enhanced.

  Furthermore, since the temperature in the exhaust-side space chamber 122 is lowered by opening the light source lower cover 12, the rotational speed of the blower 110 is lowered, and noise due to rotational noise is reduced. Further, since the exhaust discharged from the lower surface plate 133 of the lamp lower exhaust plate 131 flows along the light source lower cover 12, it is possible to prevent high temperature exhaust from directly hitting the table or the like on which the projector 1 is installed.

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

FIG. 3 is a perspective view of the upper surface side of the projector according to the embodiment of the invention. FIG. 3 is a perspective view of the bottom side of the projector according to the embodiment of the invention. FIG. 3 is a control block diagram 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. The bottom view which removed the bottom plate of the projector which concerns on the Example of this invention. FIG. 2 is an exploded perspective view from the bottom surface direction of the projector according to the embodiment of the invention. The perspective view from the bottom face direction which removed the bottom face plate of the state which the light source lower cover of the projector which concerns on the Example of this invention opened. The perspective view of the opening / closing control apparatus which concerns on the Example of this invention. 1 is a perspective view of a projector according to an embodiment of the present invention in a horizontally mounted state. The perspective view of the state which inclined the projection angle of the projector which concerns on the Example of this invention. Sectional drawing of the state which closed the light source lower cover of the projector which concerns on the Example of this invention. Sectional drawing of the state which the light source lower cover of the projector which concerns on the Example of this invention opened.

Explanation of symbols

1 Projector 2 Top plate
3 Front plate 4 Back plate
5 Right side plate 6 Left side plate
7 Bottom plate 8 Exhaust hole
9 Air intake 10 Projection port
11 Louver 12 Light source lower cover
13 Open / close button 14 Shaft fixing part
15 Open / close control device 16 Push spring
17 First interlocking shaft 18 Cam plate
19 Second interlocking shaft 21 Bump
22 Opening / closing control device storage part 23 Engagement part
24 Knob protrusion 27 Leg
31 I / O connector section
32 I / O interface 33 Image converter
34 Display encoder 35 Display driver
36 Image compression / decompression unit 37 Memory card
38 Ir receiver 39 Ir processor
40 Key / Indicator section 41 Control section
42 Power supply control circuit 43 Cooling fan drive control circuit
44 Video RAM 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 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 Lighting block 79 Image generation block
80 Projection side block 83 Light source side lens group
84 Irradiation mirror 86 Optical system control board
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
115 heat pipe 116 fin
120 Partition wall 121 Inlet side space
122 Exhaust side space 127 Lighting side block bulkhead
131 Lamp exhaust plate 132 Lamp outlet
133 Bottom plate 134 Front plate
135 Through hole 136 Fixing screw

Claims (7)

  A data projector including a light source device and a cooling fan, the light source device having a light source device in front of the housing of the projector, and a light source lower cover positioned below the light source device can be opened and closed with a rear end as a rotation axis A projector characterized by being.   The light source lower cover has a substantially triangular side wall at both left and right ends of a rectangular thin plate cover body, an engaging portion at a part of the side wall, and a member whose tip can be engaged with the engaging portion. The projector according to claim 1, further comprising an opening / closing control device provided, wherein an opening / closing angle of the light source lower cover can be adjusted and fixed.   The open / close control device includes an open / close button, a push spring disposed on the back surface of the open / close button and returning the open / close button, and a first interlocking shaft connected to an end of the open / close button and sliding in conjunction with the movement of the open / close button. And a cam plate that is connected to the end of the first interlocking shaft and has a shaft sliding hole in which the cam shaft slides in the center, and an end that is connected to the end of the cam plate and the other end is an engaging portion of the light source lower cover The projector according to claim 2, further comprising a second interlocking shaft that engages with the engagement groove.   The cooling fan is disposed behind the light source device, and the casing is partitioned into an intake side space chamber in which a cooling fan is disposed and an exhaust side space chamber in which the light source device is disposed. The projector according to claim 1, wherein the face plate has an exhaust hole.   5. The projector according to claim 1, further comprising a lamp lower exhaust plate at a lower portion of the light source device.   6. The projector according to claim 5, wherein the lamp lower exhaust plate has a rectangular lower surface plate slightly smaller than the light source lower cover and a front plate rising from a front end of the lower surface plate. The projector according to claim 6, wherein the lamp lower exhaust plate has through holes in a lower surface plate and a front plate.

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