JP5136833B2 - projector - Google Patents

Description

  The present invention relates to a projector.

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

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

  The micromirror display element swings a minute mirror cell by a control signal to control the direction of reflected light, and the light incident on the display element by the light source side optical system directs the direction of the projection lens which is the projection side optical system. The on-state light reflected on the light and the off-state light reflected in the direction of the light absorbing plate are used to project a color image on the screen by controlling the time during which the red light, green light, and blue light are turned on. .

In such a projector, a metal highland lamp or an ultra-high pressure mercury lamp, which is a light source, is very hot, so the light source is cooled by a cooling device such as a cooling fan. However, there is a problem that the heat of the light source is transmitted and the temperature becomes high. In Japanese Patent Application Laid-Open No. 2005-121704 (Patent Document 1), the heat of the light source is transmitted to the housing or the like by disposing a vacuum heat insulating material between the light source and another member, such as between the light source and the housing. Proposals have been made to prevent this.
JP 2005-121704 A

  As described above, a light source such as a metal highland lamp or an ultra-high pressure mercury lamp used in a projector becomes very high temperature, and thus the light source is cooled using a cooling fan or the like. However, there has been a problem that the high-temperature exhaust air after cooling the light source hits a louver or the like provided with exhaust holes or that the louver becomes hot due to radiant heat from the light source when the distance between the light source and the louver is short.

  Further, when the rotational speed of the cooling fan is increased in order to enhance the cooling effect of the light source, there is a problem in that the exhaust air hits the lattice of the louver to generate turbulence and increase the wind noise. Furthermore, in order to prevent hot air from hitting the lattice portion of the louver and causing the louver to become hot, there is an idea that the louver is formed of a resin having a heat insulating performance, but it has been difficult to realize due to the problem of strength.

  The present invention has been made in view of such problems, and provides a projector that can prevent a casing portion in which an exhaust hole such as a louver is formed from becoming hot and can also reduce noise caused by exhaust air. For the purpose.

  A projector according to the present invention includes a light source device, a light source side optical system, a display element, a projection side optical system, a cooling fan, a projector control means, and a projector housing incorporating these various devices. The projector housing has a lattice-like louver provided with exhaust holes, and a plurality of heat insulating members are arranged inside the lattice of the louver.

  The lattice of the louver is provided with grooves on the inside.

  Further, an exhaust temperature reducing device is disposed in the vicinity of the louver, and the heat insulating member is disposed between the exhaust temperature reducing device and the louver.

  The heat insulating member is a cylindrical long bar.

  The heat insulating member is formed of an elastomer.

  Further, the heat insulating member is fixed to the louver by a fixing member.

The fixing member is also made of an elastomer.
Moreover, the said heat insulation member is arrange | positioned so that the said groove | channel of the grating | lattice of the said louver may be plugged up.

  ADVANTAGE OF THE INVENTION According to this invention, the housing part which formed exhaust holes, such as a louver, can be prevented from becoming hot, and the projector which can also reduce the noise by exhaust air can be provided.

  The projector 10 of the best mode for carrying out the present invention includes a light source device 63, a light source side optical system 66, a display element 51, a projection side optical system 90, a cooling fan, projector control means, and these A projector housing containing various devices, the projector housing has a lattice-like louver 12 with exhaust holes 17, and a plurality of heat insulating members 151 are arranged inside the lattice of the louver 12, The lattice of the louver 12 is provided with grooves 12a on the inside.

  The projector housing is air-tightly divided into an exhaust-side space chamber 122 in which various devices such as a light source device 63 that is at a high temperature are arranged and an intake-side space chamber 121 in which various devices at a low temperature are arranged. The louver 12 located in the exhaust side space chamber 122 has an exhaust hole 17, and the cooling fan is a blower 110, the suction port 111 is located in the intake side space chamber 121, and the discharge port 113 is located in the exhaust side space chamber 122. The exhaust temperature reducing device 114 for reducing the exhaust temperature is arranged in parallel with the louver 12, and the heat insulating member 151 is arranged between the exhaust temperature reducing device 114 and the louver 12.

  The heat insulating member 151 is a cylindrical long bar formed of an elastomer, and is fixed to the louver 12 by a fixing member 153 formed of an elastomer.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a projector 10 according to an embodiment of the present invention has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers a projection port on a side of a louver 12 that is a front panel of a main body case. The louver 12 is provided with a plurality of exhaust holes 17 formed by arranging a vertical frame and a horizontal frame in a lattice pattern.

  The top panel 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 light source device lamp. And a lamp switch key for lighting the lamp, a lamp indicator for displaying the lighting of the lamp, and a key and an indicator such as an overheat indicator for notifying when the light source device is overheated.

  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, etc. on the rear panel. Is.

  Note that the right side panel 14 which is a side panel of the main body case (not shown) and the left side panel 15 which is the side panel shown in FIG. 1 are each provided with a plurality of intake holes 18.

  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. A projection system lens that forms a light image with the reflected light of the display element 51 and makes the light beam emitted from the light source device 63 incident on the display element 51 via the light source side optical system, and serves as a projection side optical system An image is projected and displayed through a group on a screen (not shown). The movable lens group 97 of the projection side optical system 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.

  In addition, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper panel 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. The control circuit board 103, which is the main control board of the control system, and the power supply control circuit board 102 to which the lamp power circuit block 101 of the power system is attached are formed separately.

  As shown in FIG. 3, the projector 10 has an internal structure in which an optical system unit 65 provided with various optical systems is provided with a power control circuit board 102 to which a lamp power circuit block 101 and the like are attached in the vicinity of the right panel 14. Are arranged in parallel with the left panel 15, and the inside of the casing is airtightly partitioned by a partition wall 120 into an intake side space chamber 121 on the back panel 13 side and an exhaust side space chamber 122 on the front side. In addition, a sirocco fan type blower 110 as a cooling fan is arranged in the approximate center in the housing, the suction port 111 of the blower 110 is located in the intake side space chamber 121, and the discharge port 113 of the blower 110 is the exhaust side space chamber It is located at the boundary between 122 and the intake side space chamber 121.

  The exhaust-side space chamber 122 is formed by a reflector in which the top and bottom of an elliptical spherical shape are cut into a planar shape, and a discharge lamp using halogen or the like built in the reflector, and is located near the louver 12. The wheel motor 69 is provided with a light source device 63 arranged, a first reflection mirror 67 that reflects light emitted from the light source device 63 to the color wheel 68, and color filters for red light, green light, and blue light around the wheel motor 69. A rotating color wheel 68 and an exhaust temperature reducing device 114 are disposed, and a plurality of heat insulating members 151 are disposed in the vicinity of the inside of the louver 12.

  The optical system unit 65 is composed of three blocks of 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, and is arranged along the left panel 15. It is.

  The illumination side block 78 includes a part of the light source side optical system 66 that guides the light emitted from the light source device 63 and colored by the color wheel 68 to the display element 51 provided in the image generation block 79. The light source side optical system 66 includes a light guide rod 71 that is a light guide device that uses light transmitted through the filter of the color wheel 68 as a light flux having a uniform intensity distribution, and a light collecting device that collects light transmitted through the light guide rod 71. There is a light lens 72 and the like.

  The image generation block 79 includes a second reflection mirror 70 that changes the direction of the light emitted from the light guide rod 71, and a plurality of lenses that collect the light reflected by the second reflection mirror 70 on the display element 51. The light source side lens group 83 and the irradiation mirror 84 that irradiates the display element 51 with light transmitted through the light source side lens group 83 at a predetermined angle are provided as the light source side optical system 66, and the DMD is used as the display element 51. (Digital micromirror device). A display element cooling device 53 for cooling the display element 51 is disposed on the rear panel 13 side of the display element 51 to prevent the display element 51 from becoming high temperature.

  The projection-side block 80 has a lens group of a projection-side optical system 90 that emits light that is reflected by the display element 51 and forms an image to the screen. The projection-side optical system 90 is a fixed built-in lens barrel. The lens group 93 and the movable lens group 97 built in the movable lens barrel are used as a variable focus lens with a zoom function, and the zoom lens and focus adjustment are performed by moving the movable lens group 97 by a lens motor. It is what is possible.

  The exhaust temperature reduction device 114 is disposed in the vicinity of the inside of the louver 12, reduces the temperature of the exhaust that has been exhausted from the discharge port 113 of the blower 110 and has cooled the light source device 63, and emits light from the exhaust hole 17 of the louver 12. Is functioning as a light shielding means for preventing leakage of the liquid to the outside.

  The louver 12, which is the front panel of the projector housing, has a lattice shape with the exhaust holes 17 as described above. As shown in FIG. 4, grooves 12a are formed inside the lattice, and upper and lower ends. The frame of the part is provided with a locking hole 12b through which a locking claw 154b of a fixing member 153 described later is inserted.

  The heat insulating member 151 prevents the outer surface of the louver 12 from being heated by the radiant heat of the light source device 63 or the exhaust air hitting the inside of the lattice of the louver 12. As shown in FIG. 5, the heat insulating member 151 is a plurality of cylindrical long bars formed of an elastomer having a high heat insulating effect, and closes the grooves 12 a formed inside the lattice of the louver 12. The louver 12 is disposed in the vicinity of the inner side of each horizontal frame forming the lattice, and is fixed to the louver 12 by a fixing member 153.

  The fixing member 153 fixes the heat insulating member 151 to the louver 12 and is formed of an elastomer like the louver 12, and a plurality of heat insulating members 151 are held in parallel at the same interval as the horizontal frame interval of the lattice. The heat insulating member holding portion 154 and a connecting portion 155 for connecting the upper and lower end portions of the plurality of heat insulating member holding portions 154 are provided.

  The heat insulating member holding portion 154 has a heat insulating member fitting portion 154a formed at substantially the same interval as the horizontal frame of the louver 12, and a locking claw 154b formed so as to protrude from the upper and lower ends. In addition, the upper and lower end portions are connected by the connecting portion 155 so as to be substantially the same as the interval of the vertical frames of the louver 12.

  Then, as shown in FIG. 4, the fixing member 153 is configured to fit the plurality of heat insulating members 151 into the heat insulating member fitting portion 154a of the heat insulating member holding portion 154, and keep the heat insulating member 151 fitted. The heat insulating member 151 is fixed to the inside of the louver 12 by inserting the locking claws 154b of 154 into the locking holes 12b of the louver 12.

  Next, the cooling mechanism in the housing of the projector 10 of this embodiment will be described. As shown in FIG. 6, when the blower 110 rotates, peripheral air is sucked into the suction port 111, and external air flows into the intake side space chamber 121 from the intake hole 18 and is arranged in the intake side space chamber 121. The power supply control circuit board 102, the control circuit board 103, the display element 51 and the like provided with the lamp power supply circuit block 101 are cooled.

  Then, the air sucked from the suction port 111 of the blower 110 is blown into the exhaust side space chamber 122 from the discharge port 113, cools a high-temperature device such as the light source device 63, and then passes through the exhaust temperature reducing device 114 to be discharged. The temperature is reduced and the air is exhausted from the exhaust hole 17 of the louver 12 to the outside. At this time, the exhaust air that has passed through the exhaust temperature reducing device 114 is rectified toward the exhaust hole 17 by the heat insulating member 151 and exhausted to the outside as shown in FIG. The wind is not directly hit, and the heat of the exhaust wind can be prevented from being transmitted to the lattice of the louver 12. Further, it is possible to prevent the radiant heat of the light source device 63 from being transmitted to the lattice of the louver 12 by the heat insulating member 151.

  According to the present embodiment, by disposing the heat insulating member 151 inside the lattice of the louver 12, the exhaust air hits the inside of the lattice of the louver 12 to heat the inside of the lattice, and the heat causes the surface of the louver 12 to be heated. Can be prevented. Even if the light source device 63 is arranged in the vicinity of the louver 12, the louver 12 can be prevented from being heated by the radiant heat from the light source device 63. Also, by forming the grooves 12a inside the lattice of the louver 12, an air layer is formed between the heat insulating member 151 and the lattice, so that the heat of the heat insulating member 151 is transmitted to the surface of the louver 12 through the lattice, and the louver The 12 surfaces can be prevented from being heated.

  Then, by disposing the heat insulating member 151 between the exhaust temperature reducing device 114 and the louver 12, the exhaust air cooled by the exhaust temperature reducing device 114 blows into the heat insulating member 151 and the exhaust hole 17, so that the heat insulating effect of the louver 12 is achieved. And the light from the light source device 63 can be prevented from leaking from the exhaust hole 17 to the outside.

  Further, by forming the heat insulating member 151 in a cylindrical shape, an air layer is formed inside, so that the heat conductivity of the heat insulating member 151 can be lowered, the heat insulating effect can be increased, and the outer edge is curved so that the exhaust is exhausted. The wind does not hit the heat insulating member 151 to generate turbulent flow, and noise can be prevented.

  Furthermore, by forming the heat insulating member 151 from an elastomer, the heat insulating effect can be enhanced, the manufacturing can be facilitated, noise can be absorbed by the elasticity of the elastomer, and noise can be reduced.

  Further, fixing the heat insulating member 151 to the louver 12 by the fixing member 153 makes it easy to fix the heat insulating member 151, and further, forming the fixing member 153 by an elastomer increases the heat insulating effect and the noise reduction effect. At the same time, since the elastomer is flexible, the projector 10 can be easily manufactured by attaching to the louver 12.

  In the present embodiment, the heat insulating member 151 has a cylindrical shape, but the same effect can be obtained even if it is formed in a streamline shape. 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 panel removed. The perspective view which looked at the heat insulation member and louver which concern on the Example of this invention from the inner side. The disassembled perspective view of the heat insulation member which concerns on the Example of this invention. FIG. 3 is a top view of the projector according to the embodiment of the present invention with the top panel showing the flow of exhaust air removed. The figure which shows the flow of the exhaust_gas | exhaustion in the exhaust side space chamber of the projector which concerns on the Example of this invention.

Explanation of symbols

10 Projector 11 Top panel
12 louver 12a groove
12b Locking hole
13 Rear panel 14 Right panel
15 Left panel 17 Exhaust hole
18 Air intake hole 19 Lens cover
20 Various terminals 21 Input / output connector
22 I / O interface 23 Image converter
24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit
32 Memory card 35 Ir receiver
36 Ir processing section 37 Key / indicator section
38 Control unit 41 Power control circuit
43 Cooling fan drive control circuit 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 53 Display element cooling device
63 Light source device 65 Optical system unit
66 Light source side optical system 67 First reflection mirror
68 Color wheel 69 Wheel motor
70 Second reflection mirror 71 Light guide rod
72 Condenser lens 78 Illumination side block
79 Image generation block 80 Projection side block
83 Light source side lens group 84 Irradiation mirror
90 Projection side optical system 93 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 151 Heat insulation member
153 Fixing member
154 Heat insulation member holding part 154a Heat insulation member fitting part
154b Locking claw 155 Connecting part

Claims (8)

A light source device, a light source side optical system, a display element, a projection side optical system, a cooling fan, a projector control means, and a projector housing incorporating these various devices,
The projector housing has a lattice-like louver provided with exhaust holes, and a plurality of heat insulating members are arranged inside the lattice of the louver.   The projector according to claim 1, wherein the lattice of the louver includes a groove on an inner side. An exhaust temperature reducing device is disposed in the vicinity of the louver,
The projector according to claim 1, wherein the heat insulating member is disposed between the exhaust temperature reducing device and the louver.   The projector according to claim 1, wherein the heat insulating member is a cylindrical long bar.   The projector according to claim 1, wherein the heat insulating member is made of an elastomer.   The projector according to claim 1, wherein the heat insulating member is fixed to the louver by a fixing member.   The projector according to claim 6, wherein the fixing member is made of an elastomer. The projector according to claim 2, wherein the heat insulating member is disposed so as to close the groove of the lattice of the louver.

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