JP4798442B2 - projector - Google Patents

Description

The present invention relates to projector.

  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 the 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 flow path is formed so as to distinguish a light source device that has a particularly high temperature and a large amount of heat generation from other heat generation sources, and a light source with cooling air that cools an optical system at a temperature lower than that of the light source device. Has been proposed, in which the power supply unit or the like is cooled by cooling air using 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 1 is a projector in which the 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

  However, since recent projectors are downsized, it is difficult to secure a wide space for cooling, and various optical systems are often integrated as an optical system unit. The optical system on the light source side close to the apparatus and the optical system on the projection side must be arranged close to each other. For this reason, there is a problem that heat is transmitted from the optical system on the light source side to the optical system on the projection side, and fluctuations or the like occur in the projected image.

The present invention has been made in view of the above-described problems of the prior art. The entire projector can be efficiently cooled, and the optical system on the projection side and the optical system on the light source side are arranged close to each other. Even in such a case, an object is to provide a small projector including an optical system unit in which the optical system on the projection side does not become a high temperature.

Projector of the present invention, section and a light source equipment, an optical system unit comprising various optical systems, and a cooling fan for cooling the light source equipment, the interior of the housing to the intake side space chamber and the exhaust side space compartment A partition wall for partitioning, the suction port of the cooling fan is located in the intake side space chamber, the discharge port of the cooling fan is opened in the exhaust side space chamber, and the light source device is connected to the exhaust side disposed in the space chamber, the cooling fan is disposed on the intake side space chamber, the optical system unit includes an illumination side block, an image generating block, and a projection side block, the illumination side block the click and the projection side block are disposed adjacent to each other, between the projection side block and the illumination side block is sucked from the outside, on the illumination side block of heat the projection side block have the air flow path to prevent the transmitted The The illumination side block of the septum wall having an-out cut unplug provided for air to flow cooling fan for cooling the light source equipment, air sucked from the outside flows through the air passage was followed, Ri cut disconnect Kiyo provided on the illumination side block of the partition wall, flows into the intake side space compartment, and then flows into the suction port of the cooling fan, the light source is discharged from the discharge port of the cooling fan The apparatus is cooled .

  According to the present invention, the entire projector can be efficiently cooled, and even when the projection side optical system and the light source side optical system are arranged close to each other, the optical unit that does not cause the projection side optical system to become high temperature. And a projector provided with the said optical system unit can be provided.

  The projector 10 according to the best mode for carrying out the present invention is composed of a substantially rectangular parallelepiped housing. Inside the housing is a light source device 63, an optical system unit 77, and a blower as a cooling fan for cooling the light source device 63. 110.

  A partition wall 120 for partitioning the intake-side space chamber 121 and the exhaust-side space chamber 122 is provided, the light source device 63 is provided in the exhaust-side space chamber 122, and the suction port 110 of the cooling fan is provided in the intake-side space chamber 121. In addition, the cooling fan discharge port 113 opens into the exhaust side space chamber 122, the side plate of the casing on the intake side space chamber 121 side has an intake hole 18, and the casing on the exhaust side space chamber 122 side. The side plate has an exhaust hole 17.

  The optical system unit 77 includes an illumination side block 78, an image generation block 79, and a projection side block 80. The illumination side block 78 and the projection side block 80 are adjacent to each other so that their optical axes are substantially parallel. The image generation block 79 is arranged so as to connect the illumination side block 78 and the projection side block 80, and has a gap as an air flow path between the illumination side block 78 and the projection side block 80. It is what.

  The illumination-side block 78 is communicated with the exhaust-side space chamber 122, and the image generation block 79 is disposed so as to connect the illumination-side block 78 and the projection-side block 80, and refracts the emitted light from the light source device. Project.

  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. In addition, the front plate 12 is provided with a plurality of exhaust holes 17. The exhaust holes 17 prevent light in the casing from leaking to the outside and prevent exhaust heat from flowing in front of the projection port. It has the louver 20 for.

  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 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.

  A plurality of air intake holes 18 are provided in the right side plate 14 which is a side plate of the main body case (not shown) 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 lamp 64 of the light source device, and the cooling fan drive control circuit 43 Is to detect the temperature by a temperature sensor provided in the light source device or the like to control the rotation speed of the cooling fan, and to maintain the rotation of the cooling fan even after the lamp of the light source device is turned off by a timer or the like.

  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.

  Further, as shown in FIG. 3, the projector 10 has an internal structure in which a power control circuit board 102 with a lamp power circuit block 101 and the like attached thereto is disposed in the vicinity of the right side plate 14, and as shown in FIG. A partition wall 120 for the inside of the body forms an airtight space chamber 121 on the back plate 13 side and an exhaust side space chamber 122 on the front plate 12 side in an airtight manner. In the vicinity of the back plate 13, it is arranged on the bottom plate 16, 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, the optical system unit 77 is disposed along the left side plate 15, and 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 is in open communication 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.

In the light source device 63, an ultrahigh pressure mercury lamp is provided as a discharge lamp 64 inside a reflector 65 whose front surface is covered with explosion-proof glass.
Further, as shown in FIG. 5, the 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. 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 around the wheel block 73. A color wheel 71 that is rotated 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 are provided. Further, 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. A light source side lens group 83 formed of the above lens, 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 device), a display element unit for holding the display element 51, and the like.

  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. It is composed of a fixed lens group 93 built in 91 and a movable lens group 97 built in the movable lens barrel 95, and is a variable focus type lens having a zoom function. The movable lens group 97 is moved by a lens motor. Thus, zoom adjustment and focus adjustment are possible.

  Further, 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 provided with the movable lens barrel 95 and the like. By controlling the operation of the action lens group 97, a zoom function and focus adjustment can be performed.

In addition, the illumination side block 78 and the projection side block 80 are arranged adjacent to each other so as to form a gap 128 so as to have a cooling air flow path between both blocks. Has an outer wall. 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.
In addition, the 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.

  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.

The partition wall 120 is composed of a plate-like first partition wall 123, a second partition wall 124, a third partition wall 125, and an upper surface partition wall and a lower surface partition wall (not shown).
The first partition wall 123 is connected to the end portion of the partition wall 127 included in the optical system unit 77, extends substantially in parallel with the front plate 12 from the end portion of the partition wall included in the optical system unit 77, and the discharge port of the blower 110. The power supply control circuit board 102 is separated by penetrating 113. The first partition wall 123 is a partition wall provided for exhausting exhaust from the discharge port 113 of the blower 110 completely to the exhaust side space chamber 120 side.

  Further, the second partition wall 124 is separated from the end portion of the first partition wall 123 to the end portion of the power supply control circuit board 102 substantially in parallel with the power supply control circuit board 102. The third partition 125 is separated from the end of the second partition 124 to the right side surface 14 substantially in parallel with the front plate 12. The second partition wall 124 and the third partition wall 125 are partition walls provided to partition the power supply control circuit board 102 and the exhaust side space chamber 122.

  The upper partition and the lower partition are arranged so that the heat of the exhaust side space 122 is not directly transferred to the top plate 11 and the bottom plate 12, and the exhaust side space 122, the top plate 11 and the bottom plate are arranged. 12 has a space between them.

  The first partition wall 123, the second partition wall 124, and the third partition wall 125 use heat insulating members such as resin as in the optical system unit 77. Thereby, it is possible to prevent the high heat generated by the light source device 63 in the exhaust side space 122 from leaking to the outside.

  Next, the flow of air in the projector 10 will be described. As shown in FIG. 5, 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 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.

  A display element heat radiating plate 53 is arranged behind the display element. The control circuit board 103 serves as two control boards between the two control circuit boards 103 or between the two control circuit boards 103. Above or below, 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 10, so that the side plate of the casing 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, 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. 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.

  In this way, the high-temperature air after cooling the light source device 63 and the color wheel 71 in the exhaust-side space chamber 122 spreads throughout the front plate 12 and is discharged from the exhaust holes 17 provided in the front plate 12. . Since the louver 20 is attached to the exhaust hole 17, it is possible to block the internal light so as not to leak to the outside, and to reduce the exhaust temperature discharged to the outside. Since the louver 20 is attached obliquely toward the side, it is possible to prevent high-temperature exhaust from being discharged toward the projection-side optical system 62.

  Further, as shown in FIG. 6, the air flow in the vicinity of the optical system unit 77 is a part of the air sucked from the intake hole 18 of the left side plate 15 between the optical system unit 77 and the bottom plate 16. And flows into the gap 128 between the illumination side block 78 and the projection side block 80 to prevent 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.

  According to the present embodiment, since the gap 128 serving as an air flow path is formed between the illumination side block 78 and the projection side block 80 constituting the optical system unit 77, the heat of the illumination side block 78 is transferred to the projection side block 80. The projection side block 80 becomes hot due to the heat of the illumination side block 78, and it is possible to prevent the projection image from defocusing and fluctuations in the projection image. By forming the optical system unit 77, the cooling effect of the optical system unit 77 can be enhanced, and the entire projector 10 can be easily reduced in size as the small optical system unit 77.

  In the above-described embodiment shown in the drawings, the illumination side block 78 is communicated with the exhaust side space 122 in an opening, and the illumination side block partition wall 127 partially illuminates the image side block 78 and the projection side block. The illumination side block 78 is arranged inside the exhaust side space chamber 122 without communicating with the exhaust side space chamber 122, or is transparent between the illumination side block 78 and the light source device 63. The entire optical system unit 77 including the illumination side block 78 may be disposed in the intake side space chamber 121 instead of the exhaust side space chamber 122 while providing the partition wall and disposing the illumination side block 78 in the vicinity of the light source device 63.

  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. The cooling fan is not limited to the sirocco fan type blower 110.

1 is a perspective view of a projector according to an 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 perspective view of the projector according to the embodiment of the present invention with a part of the top plate removed. 1 is a perspective view of a projector according to an embodiment of the present invention with a top plate removed. Explanatory drawing which shows the flow of the air of the projector which concerns on the Example of this invention. Sectional drawing of the optical system unit which concerns on the Example of this 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 Air intake hole 19 Lens cover
20 Louver 21 Input / output connector
22 I / O interface 23 Image converter
24 Display encoder 26 Display drive
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 heat sink 62 Projection side optical system
63 Light source device 64 Discharge lamp
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
91 Fixed lens barrel
93 Fixed lens group 95 Movable lens barrel
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 120 Partition wall
121 Inlet side space 122 Exhaust side space
123 1st partition 124 2nd partition
125 3rd partition 127 Lighting side block partition
128 Gap 129 Cutout

Claims (7)

A light source device, an optical system unit including various optical systems, a cooling fan that cools the light source device, and a partition wall that partitions the inside of the housing into an intake side space chamber and an exhaust side space chamber ,
The suction port of the cooling fan is located in the intake side space chamber, and the discharge port of the cooling fan opens into the exhaust side space chamber,
The light source device is disposed in the exhaust side space chamber,
The cooling fan is disposed in the intake side space chamber,
The optical system unit is:
An illumination side block, an image generation block, and a projection side block;
Wherein the illumination side block and the projection side block are disposed adjacent to each other, between the illumination side block and the projection side block is sucked from the outside, the heat of the illumination side block is transmitted to the projection side block Has an air flow path to prevent
The partition of the illumination side block has a cutout provided for flowing air to a cooling fan for cooling the light source device,
After air sucked from the outside is flowing the air flow path, from the cut-out provided in the partition wall of the illumination side block, it flows into the intake side space compartment, and then narrowing the flow to the inlet of the cooling fan, projector characterized that you cool the light source device is discharged from the discharge port of the cooling fan. The projector according to claim 1, the side plate of the front Symbol intake side space compartment side of the housing has an intake hole, wherein the side plate of the exhaust side space compartment side of the housing and having an exhaust hole.   The projector according to claim 2, wherein the suction holes are provided in at least the left and right side plates of the housing, and the exhaust holes are provided in a front side plate.   The projector according to claim 2 or 3, wherein the illumination side block of the optical system unit is in open communication with the exhaust side space chamber. The image generation block connects the illumination side block and the projection side block, the illumination side block, the image generation block, and the projection side block are arranged in a U-shape,
The projector according to any one of claims 1 to 4, wherein the light emitted from the light source device is refracted and projected.   The projector according to any one of claims 1 to 5, wherein outer walls of the illumination side block and the projection side block are formed of a member having heat insulation properties. The illumination side block includes a first reflection mirror that reflects light from the light source device, a color wheel, a wheel motor, and a light tunnel,
The image generation block includes a second reflection mirror, an irradiation mirror, a light source side lens group, a display element,
The projector according to claim 1, wherein the projection side block includes a projection side optical system.

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