JP5041216B2 - projector - Google Patents

Description

  The present invention relates to a 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, a data projector uses a light source device equipped with a small high-intensity discharge lamp such as a metal highland lamp or an ultra-high pressure mercury lamp, and the light emitted from the light source device is converted into light of three primary colors by a color filter. A display element called a liquid crystal or a DMD (digital micromirror device) is irradiated by a side optical system, and the transmitted light or reflected light of the display element is passed through a lens group which is a projection side optical system having a zoom function. The structure is projected onto the screen.

  Since the light source device used in this data projector becomes very high temperature, a cooling fan is arranged in the case, outside air is taken into the projector case from the periphery of the projector case and circulated, and the exhaust that has become hot is returned again. Projectors that reduce the temperature in the projector housing by discharging to the outside are often used. However, such a projector has a problem in that high-temperature exhaust flows into the periphery of the projection lens and causes fluctuations in the projected image.

  In order to solve such a problem, Japanese Patent Laid-Open No. 2002-372747 (Patent Document 1) proposes a projector including a lens cover that serves as a threshold plate between the exhaust hole and the projection port when opened. Has been made. According to this proposal, it is possible to prevent high-temperature exhaust discharged from the exhaust hole during projection from flowing in front of the projection port during projection, and thus it is possible to prevent fluctuations in the projected image.

Even when the projector is turned off and the discharge lamp is turned off, the light source device and its surroundings are still hot, so the cooling fan can be operated for the required time even after the discharge lamp is turned off using the program switch. After the projector is cooled, all the power supplies are turned off.
JP 2002-372747 A

The present invention aims to exhaust hot discharged from the exhaust hole of the projector to provide a pulp projector to prevent fluctuation of the projected image generated by flowing in front of the projection opening in the projection.

A projector according to the present invention is a housing that includes a light source device, a light source side optical system, a display element, a projection side optical system, a cooling fan, and projector control means, and includes a plurality of exhaust holes and a projection port. A slidable lens cover disposed in the vicinity of the projection port, and the lens cover is in an open state by sliding inward of the housing. A part of a predetermined exhaust hole located in the vicinity is closed, and the exhaust hole is opened in the closed state .

According to the present invention, it is possible to exhaust the high temperature discharged from the exhaust hole of the projector to provide a pulp projector to prevent fluctuation of the projected image generated by flowing in front of the projection opening in the projection.

  The projector 1 of the best mode for carrying out the present invention includes a substantially rectangular parallelepiped projector housing having a front plate 3 in which a plurality of exhaust holes 7 and projection ports 99 are formed, and a position near the projection port 99 during projection. Fluctuation preventing means for closing the predetermined exhaust hole 7 and opening the exhaust hole 7 during non-projection is provided.

  Inside the projector housing, a light source device 61, a light source side optical system composed of a color wheel 71, a light guide device 75, a light source side lens group 62, etc., a display element 50, and a projection side optical system 90 The cooling fan and the projector control means are arranged.

  The fluctuation preventing means is a slidable lens cover 51 disposed in the vicinity of the projection port 99, and the lens cover 51 covers a part of the predetermined exhaust hole 7 positioned in the vicinity of the projection port 99 when the lens cover 51 is open. In the closed and closed state, the exhaust hole 7 is opened in front of the lens.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a projector 1 according to an embodiment of the present invention has a substantially rectangular parallelepiped shape, and has a projection port 99 on the side of a front plate 3 that is a side plate in front of a main body case serving as a projector housing. The front plate 3 is provided with a plurality of exhaust holes 7.

  Further, a key / indicator portion 37 is formed on the upper surface plate 2 which is a main body case. The key / indicator portion 37 is a power switch key, a power indicator for notifying power on / off, and a lamp for lighting a lamp of the light source device. It is provided with keys and indicators such as a switch key, a lamp indicator for displaying the lighting of the lamp, and an overheat indicator for notifying when the light source device is overheated.

  In addition, on the back side of the main body case, an I / O connector section provided with a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, etc., and an Ir receiver that receives control signals from a power adapter plug or a remote controller. This is provided with various terminals 9 such as sections.

  Further, a plurality of air intake holes 8 are formed in the right side plate 4 which is a side plate of the main body case (not shown in FIG. 1) and the left side plate 5 which is the side plate shown in FIG.

  As shown in FIG. 2, the control circuit as the projector control means of the projector 1 includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. Thus, the image signals of various standards input from the input / output connector unit 21 are 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). After being converted to, it is sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  A display driving unit 26 to which a video signal is input from the display encoder 24 drives a display element 50, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. A projection lens group that forms a light image with the reflected light of the display element 50 and makes it a projection-side optical system 90 by allowing light from the light source device 61 to enter the display element 50 via the light source-side optical system. The movable lens group 97 of 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 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, and individual image data constituting a series of moving images is expanded 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 operation of each circuit in the projector 1, and includes a ROM that stores operation programs such as a CPU and various settings in a fixed manner, 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 2 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.

  This control unit 38 controls the power supply control circuit 41 and the like, and when the lamp switch key is operated, the power supply control circuit 41 turns on the discharge lamp of the light source device, and further the cooling fan drive control circuit 43 The temperature is detected by multiple temperature sensors provided in the light source device, etc., and the rotation speed of the cooling fan is controlled, and the cooling fan continues to rotate even after the light source device lamp is turned off by a timer, etc. Further, depending on the result of temperature detection by the temperature sensor, control such as stopping the light source device and turning off the power of the projector main body is also performed.

  As shown in FIG. 3, the internal structure of the projector 1 is divided into an air-intake side space chamber 121 and an exhaust-side space chamber 122 by a partition wall 120, and a sirocco fan type blower as a cooling fan. 110 is arranged such that the suction port 111 is positioned in the intake side space chamber 121 and the discharge port 113 is positioned in the exhaust side space chamber 122.

  In the intake-side space chamber 121, a power control circuit board 102 provided with a lamp power circuit block 101 and the like, a main control circuit board 103 provided with projector control means, an image generation block 79 of an optical system unit 77 described later, and The projection side block 80 is arranged.

  The exhaust-side space chamber 122 includes a light source device 61, an illumination-side block 78 of the optical system unit 77, an exhaust temperature reducing device 114 for reducing the exhaust temperature arranged in parallel with the front plate 3, and the lens cover 51. And a lens cover storage portion 55 formed near the projection port 99 of the front plate 3 to be stored. Further, a rectifying plate is disposed in the exhaust hole 7 of the front plate 3 so that the exhaust discharged from the exhaust side space 122 to the outside does not go to the periphery of the projection port 99, and is exhausted in a direction away from the projection port 99. It has become so.

  The blower 110 includes a suction port 111 and a discharge port 113. The discharge port 113 has a substantially square cross section and is connected to the partition wall 120. The air in the suction side space chamber 121 is sucked into and discharged from the suction port 111. The air is discharged to the exhaust side space chamber 122, and the light source device 61 and the like disposed in the exhaust side space chamber 122 are cooled and discharged from the front exhaust hole 7 to the outside.

  The optical system unit 77 includes three blocks, an illumination side block 78 located in the vicinity of the light source device 61, an image generation block 79, and a projection side block 80. A first reflecting mirror 72 that reflects the emitted light to the color wheel 71, a color wheel 71 that includes a color filter, a light guide device 75 that uses the light transmitted through the filter of the color wheel 71 as a light bundle having a uniform intensity distribution, and the like The light source side optical system and a wheel motor 73 for rotating the color wheel 71 are provided.

  The image generation block 79 includes a mirror and a lens group as a light source side optical system, and reflects the light emitted from the light guide device 75 toward the irradiation mirror, and this second reflection mirror. A light source side lens group 62 for condensing the light reflected by the mirror 74 on the display element 50, and an irradiation mirror 84 for irradiating the light transmitted through the light source side lens group 62 to the display element 50 from the front obliquely downward at a predetermined angle; The display device 50 includes a DMD (digital micromirror device).

  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 obliquely reflected by the micromirror to form an off-state light beam, and an image is generated and displayed by the on-state light beam reflected in the front direction.

  The projection-side block 80 has a lens group of the projection-side optical system 90 that projects the light that forms the image reflected by the display element 50 onto the screen. The projection-side optical system 90 includes the fixed lens group 93. The movable lens group 97 is a variable focus lens having a zoom function, and the movable lens group 97 is moved by a lens motor to enable zoom adjustment and focus adjustment.

  The projector 1 has a cooling mechanism in which ambient air is sucked into the suction port 111 of the blower 110, thereby taking outside air into the suction side space chamber 121 through the suction holes 8, and various members arranged in the suction side space chamber 121. After cooling, the cooling air is discharged from the discharge port 113 of the blower 110 to the exhaust-side space chamber 122, and various members of the exhaust-side space chamber 122 are cooled by this exhaust air, and the exhaust gas that has become hot is discharged to the exhaust temperature reducing device 114. Through the exhaust hole 7 of the front plate 3.

  When the high-temperature exhaust discharged to the outside from the exhaust hole 7 flows into the periphery of the projection port 99, the air on the optical axis fluctuates due to the high temperature, and the projection image may fluctuate. In order to prevent this fluctuation, the projector 1 of this embodiment includes fluctuation preventing means that closes the exhaust hole 7 located in the vicinity of the projection port 99 during projection and opens the exhaust hole 7 during non-projection.

  As shown in FIG. 1, the lens cover 51 serving as a fluctuation preventing means has a plate-like flat plate portion on the front surface and covers the front of the lens, and is used when the lens cover 51 is opened and closed. When the lens cover 51 is opened by sliding the lens cover 51 in the vicinity of the left side plate 5, the lens cover 51 is housed inside the front plate 3 as shown in FIG. 3 or FIG. Thus, the predetermined exhaust hole 7 located in the vicinity of the projection port 99 is closed.

  In this way, when the lens cover 51 in the open state closes the exhaust hole 7 located in the vicinity of the projection port 99 in the open state, the exhaust discharged from the front plate 3 is discharged to a location away from the projection port 99. Thus, high-temperature exhaust does not flow in the forward direction of the projection port 99, and fluctuations in the projected image can be prevented.

  Further, by closing the lens cover 51 after the lamp is turned off, the entire surface of the exhaust hole 7 formed in the front plate 3 is opened, so that the cooling efficiency of the light source device 61 can be increased, and the discharge lamp is turned off. Cool down time can be shortened.

  According to the projector 1 of the present embodiment, the air in the vicinity of the projection port 99 is provided with a fluctuation preventing means that closes the exhaust hole 7 located in the vicinity of the projection port 99 during projection and opens the exhaust hole 7 during non-projection. Fluctuations in the projected image that occur due to fluctuations due to the exhaust air can be prevented, and at the time of non-projection, the exhaust holes 7 are opened to exhaust the exhaust gas from the entire surface of the front plate 3, thereby improving the cooling efficiency.

  In addition, the lens cover 51 is used as a means for preventing fluctuations, and the shape of the exhaust hole 7 located in the vicinity of the projection port 99 is closed during projection, thereby preventing fluctuations by utilizing the lens cover 51 provided in a conventional projector. Therefore, it is possible to provide the projector 1 that realizes the prevention of fluctuations with almost no change in the structure of the conventional projector 1.

  Although the lens cover 51 is manually opened, a tooth profile is formed on the inner side of the lens cover 51, and an operating motor is disposed in the vicinity of the lens cover 51, and this operating motor is linked to the power source of the projector 1 and the like. By opening and closing the lens cover 51 using a pinion gear, the lens cover 51 is automatically opened when the power of the projector 1 is turned on, and the lens cover 51 is automatically closed when the power of the projector 1 is turned off. The projector 1 can also be provided with a lens cover 51 as an automatic open / close fluctuation preventing means.

  In another embodiment, a slit plate may be used as a fluctuation preventing means. In the above-described embodiment, the lens cover 51 is used as a means for preventing fluctuation, and the lens cover 51 is configured to close the exhaust hole 7 of the front plate 3 by opening the lens cover 51 in the direction of the exhaust hole 7 of the front plate. In the embodiment, as shown in FIG. 5, a slidable slit plate 130 is disposed inside the front plate 3 in the vicinity of the projection port 99 as a fluctuation preventing means, and the operation unit 132 of the slit plate 130 protrudes from the projector housing. It is something to be made.

  As shown in FIG. 6, the slit plate 130 is a plate-like body in which a plurality of slits 131 having substantially the same shape as the exhaust holes 7 of the front plate 3 are formed. As shown in FIG. 5A, the slit 131 of the slit plate 130 and the position of the exhaust hole 7 are overlapped to allow exhaust from the entire surface of the front plate 3 during non-projection. When the projection is performed, the slit plate 130 is slid by pulling out the operation unit 132, and as shown in FIG. 5B, the positions of the slit 131 and the exhaust hole 7 of the slit plate 130 are alternated, and the exhaust hole 7 is slit. The plate 130 can be closed. For this reason, when projecting, the exhaust hole 7 is blocked by the slit plate 130 as necessary, so that the exhaust gas from the exhaust hole 7 in the vicinity of the projection port 99 is not exhausted and the high-temperature exhaust gas flows around the front of the projection port 99. It can be prevented.

  According to this embodiment, by arranging the slit plate 130 in the vicinity of the projection port 99 of the front plate 3, it is possible to prevent fluctuations in the projected image and at the time of non-projection such as projection interruption or cool down with the lens cover closed. For example, it is possible to increase the cooling efficiency by discharging the exhaust from the entire surface of the front plate 3 by opening the exhaust hole 7. Further, since the slit plate 130 is disposed in the vicinity of the projection port 99 of the front plate 3, there is no need for a major design change of the projector 1, and the projector 1 provided with the fluctuation preventing means can be provided easily.

  As in the above-described embodiment, an operating motor is arranged in the vicinity of the slit plate 130, and this operating motor is linked to the power source of the projector 1, so that the slit plate is automatically turned on when the power of the projector 1 is turned on. When the projector 130 is closed and the projector 1 is turned off and the lamp is turned off, the slit plate 130 can be automatically opened.

  In still another embodiment, a rotatable louver as a fluctuation preventing means is attached to the exhaust hole 7 located in the vicinity of the projection port 99. This louver has a rotation shaft between the slit-like exhaust hole 7 and the exhaust hole 7, and it is possible to open and close the exhaust hole 7 by simultaneously rotating the rotating blades according to the position of each exhaust hole 7. Is.

  Therefore, when not projecting, the rotating blades of the louver are rotated to open the exhaust hole 7 so that the exhaust is exhausted from the entire surface of the front plate 3. During projection, the rotating blades of the louver are rotated to project. A predetermined exhaust hole 7 located in the vicinity of the opening 99 can be closed so that exhaust is not discharged from the exhaust hole 7.

  By arranging the louver having the rotatable wings in this way, the projection image generated by the high-temperature exhaust discharged from the exhaust hole 7 in the vicinity of the projection port 99 during the projection flows into the front of the projection port 99. Distortion can be prevented and the cooling effect can be enhanced by opening the entire front plate 3.

  As in the above-described embodiments and modifications, an operating motor is arranged in the vicinity of the louver, and this operating motor is linked to the power source of the projector 1 so that the louver is automatically turned on when the power of the projector 1 is turned on. When the projector is closed and the projector 1 is turned off, the louver can be automatically opened. In addition, as an operation switch of an operation motor for driving a slit plate or a louver, a limit switch for detecting opening / closing of the open / close lens cover shown in FIG. 5 is provided, and the exhaust hole 7 can be opened / closed by this limit switch. is there.

  Further, when the lens cover 51 is rotated and opened using a link mechanism such as a lever, the exhaust plate 7 is closed by pushing up the slit plate with a link bar or the like or rotating the rotating blades of the louver. It is also possible to adopt a structure in which the exhaust hole 7 is closed by operating a slit plate or a rotating blade when the is closed. By linking with the opening and closing of the lens cover 51 in this way, the projector closes the exhaust hole 7 in the vicinity of the projection port 99 when the lens cover 51 is open, and opens the exhaust hole 7 when the lens cover 51 is closed. Can provide one.

  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 front 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 top view of the projector according to the embodiment of the present invention with a part of the top plate removed. FIG. 3 is a front perspective view of the projector according to the embodiment of the invention with the lens cover opened. The expansion perspective view of the projector which concerns on the modification of this invention. The front view of the slit board with which the projector concerning the modification of the present invention is provided.

Explanation of symbols

1 Projector 2 Top plate
3 Front panel 4 Right panel
5 Left side plate 7 Exhaust hole
8 Air intake holes 9 Various terminals
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Power supply control circuit 43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 50 Display element
51 Lens cover 52 Opening / closing knob
55 Lens cover storage 61 Light source device
62 Light source side lens group 71 Color wheel
72 First reflection mirror 73 Wheel motor
74 Second reflection mirror 75 Light guide device
77 Optical system unit 78 Illumination side block
79 Image generation block 80 Projection side block
84 Irradiation mirror 90 Projection side optical system
93 Fixed lens group 97 Movable lens group
99 Projection port
101 Lamp power circuit block 102 Power control circuit board
103 Main control circuit board 110 Blower
111 Suction port 113 Discharge port
114 Exhaust temperature reduction device 120 Partition wall
121 Inlet side space 122 Exhaust side space
130 Slit plate 131 Slit
132 Control panel

Claims (3)

A housing containing a light source device, a light source side optical system, a display element, a projection side optical system, a cooling fan, and a projector control means, and having a plurality of exhaust holes and projection ports formed therein Have a body,
Furthermore, it has a slidable lens cover arranged near the projection port,
The lens cover slides inward of the housing to close a part of a predetermined exhaust hole located in the vicinity of the projection port when opened, and to open the exhaust hole when closed. Projector. The projector according to claim 1, wherein the lens cover has an opening / closing knob on a side opposite to an exhaust hole that is blocked in the open state. The projector according to claim 1, wherein the lens cover has a plate-like flat plate portion and has a shape that covers the front of the projection port when the lens cover is in a closed state.

Images