JP2006259119A - Light source device and projector with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device in which thermal deterioration in a color wheel caused by light from a light source part can be prevented. <P>SOLUTION: The light source device is equipped with: a light source part 15 which reflects light radiated from a light source lamp arranged inside, in a converging direction by a reflector 17 and emits the light from an open part in the front surface of the reflector 17; a light guiding rod 24 which is arranged to locate an incident plane 24a in the vicinity of the converging point of the light reflected by the reflector of the light source part 15, guides the light entering from the incident plane 24a and emits the light having a uniform intensity distribution from a light-emitting surface 24b; a color wheel 25 which is composed of a rotary plate where color filters of a plurality of colors are provided in such a manner that they are alternately placed side by side in a peripheral direction and arranged in such a manner that one side from the center of the rotation of the rotary plate crosses the optical path of the light emitted from the light source part 15; and a color wheel cover 27 which is disposed to be close to the incident side surface of the color wheel 25 and transmits the light reflected by the reflector 17 to make it incident on the color wheel 25 and intercepts the light going in a direction different from that of the light reflected by the reflector 17, out of the light emitted from the light source part 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light source device and a projector including the same.

  A projector that projects a display image of an image display element includes an image display element that displays an image by controlling emission of incident light in a projector case, and a projection that projects a display image of the image display element onto an external projection surface A lens, a light source device, and a light source side optical system for allowing light emitted from the light source device to enter the image display element are provided.

  The projector is composed of a light source lamp and a concave reflector whose front surface is open. The light emitted from the light source lamp disposed in the reflector is reflected by the reflector in the condensing direction and is emitted from an open portion of the front surface. A light source portion having light incident surfaces and light exit surfaces on one end and the other end, and the light incident portion on the light exit side of the light source portion is positioned near a condensing point of reflected light by the reflector of the light source portion. And a light guide rod that guides light incident from the incident surface and emits light having a uniform intensity distribution from the emission surface.

Further, the projector includes a liquid crystal display element or a micromirror display element that does not include a color filter as an image display element, and a color image is displayed on the image display element by field sequential display. In a projector of this type, a color wheel comprising a rotating plate in which a plurality of color filters are alternately arranged in the circumferential direction on the incident side or the emission side of the light guide rod is provided on one side from the center of rotation. Is arranged so as to intersect with the optical path of the light emitted from the light source unit, and the light emitted from the light source unit is sequentially colored into the plurality of colors by the rotation of the color wheel and used ( Patent Document 1).
JP 2003-149599 A

  The light source unit of the light source device reflects and emits the radiated light from the light source lamp in the condensing direction by the reflector, and the light directed from the light source lamp toward the open part of the reflector is condensed. It is emitted without being done.

  Therefore, the light emitted from the light source unit is reflected in the light condensing direction by the reflector, the light having a uniform intensity distribution by the light guide rod, and directly emitted from the light source lamp. And unwanted light with a large spread angle.

  In the light source device provided with the color wheel, the use light reflected by the reflector out of the light emitted from the light source unit is rotated in the limited area on the outer periphery of the color wheel as the color wheel rotates. The temperature of the color wheel due to the heat of the utilized light is relatively low because the incident light is continuously changed in the circumferential direction.

  However, of the light emitted from the light source unit, the unnecessary light having a large divergence angle directly emitted from the light source lamp is incident on a wide area of the color wheel. Therefore, the incident time of the unnecessary light per unit area on the color wheel is large. For this reason, the color wheel becomes very hot due to the heat of the unnecessary light, which causes thermal degradation.

  It is an object of the present invention to provide a light source device that can prevent thermal deterioration of a color wheel due to light from the light source section, and to provide a projector including the light source device.

  The light source device according to the present invention includes a light source lamp and a concave reflector whose front surface is open. The light emitted from the light source lamp disposed in the reflector is reflected in the light collecting direction by the reflector, and an open portion on the front surface thereof. A light source part that emits light from the light source, and a light incident surface and a light emission surface at one end and the other end, and on the light emission side of the light source part, the incident surface is near the condensing point of the reflected light by the reflector of the light source part. A light guide rod that is disposed and guides light incident from the incident surface and emits light having a uniform intensity distribution from the output surface, and a plurality of color filters are alternately arranged in the circumferential direction. A color wheel that is composed of a rotating plate and is arranged so that one side from the rotation center intersects the optical path of the light emitted from the light source unit, and sequentially colors the light emitted from the light source unit into the plurality of colors; Colorho The light emitted from the light source unit is transmitted close to the incident side surface of the lens, and the light reflected by the reflector is transmitted to enter the color wheel, and the light travels in a direction different from the light reflected by the reflector. And a color wheel cover for shutting off.

  In this light source device, the color wheel cover has an area that covers the entire incident side surface of the color wheel, and a light transmission hole that partially transmits light reflected by the reflector out of light emitted from the light source unit. A light shielding plate provided with is desirable.

  The color wheel cover is preferably formed of a material having thermal conductivity, and the color wheel cover is preferably provided with a heat transfer portion to other members.

  In this light source device, the color wheel and the color wheel cover may be arranged on the incident side of the light guide rod with the emission side surface of the color wheel facing the incident surface of the light guide rod, or the light guide The color wheel cover may be disposed on the emission side of the light rod so as to face the emission surface of the light guide rod.

  In the light source device, the light source unit is fitted in a cylindrical explosion-proof cover that projects forward from the periphery of the opening of the reflector, and an opening at the front end of the explosion-proof cover. A light-shielding plate provided with a transparent explosion-proof glass fixed to a cover, having an area covering the entire outer surface of the explosion-proof glass, and a light transmission hole provided in a portion through which reflected light from the reflector passes. Is desirable.

  In that case, it is preferable that the holding member of the explosion-proof glass is made of a material having thermal conductivity, and the holding member is provided with a heat transfer portion to other members.

The projector of the present invention is
In the projector case provided with an intake part that takes in outside air and an exhaust part that discharges internal air,
An image display element for controlling the emission of incident light to display an image;
A projection lens that projects a display image of the image display element onto an external projection surface;
A light source unit including a light source lamp and a concave reflector whose front surface is opened, and a light source unit configured to reflect the emitted light from the light source lamp disposed in the reflector in a light collecting direction by the reflector and to emit the light from the front opening unit; The light incident surface and the light exit surface are provided at one end and the other end, and on the light exit side of the light source unit, the incident surface is disposed near the condensing point of the reflected light by the reflector of the light source unit, It consists of a light guide rod that guides light incident from the incident surface and emits light with a uniform intensity distribution from the output surface, and a rotating plate in which a plurality of color filters are alternately arranged in the circumferential direction. A color wheel that is arranged so that one side from the center intersects the optical path of the light emitted from the light source unit, and sequentially colors the light emitted from the light source unit into the plurality of colors, and close to the incident side surface of the color wheel A color wheel cover that transmits light reflected from the reflector and enters the color wheel out of light emitted from the light source unit, and blocks light traveling in a direction different from the light reflected by the reflector; A light source device comprising:
And a light source side optical system for allowing light emitted from the light source device to enter the image display element.

  In this projector, the color wheel cover of the light source device is formed of a material having thermal conductivity, the color wheel cover is provided with a heat transfer portion to other members, and the heat transfer portion is connected to the projector case. It is preferable to do this.

  In this projector, the light source unit of the light source device is fitted into a cylindrical explosion-proof cover that projects forward from the periphery of the opening of the reflector, and an opening at the front end of the explosion-proof cover, A transparent explosion-proof glass fixed to the explosion-proof cover, the pressing member has an area covering the entire outer surface of the explosion-proof glass, and a light transmission hole is provided in a portion through which reflected light from the reflector passes. It is desirable to use a light shielding plate.

  In that case, it is preferable that the holding member of the explosion-proof glass is formed of a material having thermal conductivity, the heat transfer portion to the other member is provided on the holding member, and the heat transfer portion is connected to the projector case. .

  The light source device according to the present invention includes a light source unit that reflects light emitted from a light source lamp in a condensing direction by a reflector and emits the light from an open portion on a front surface thereof, and an incident surface on an emission side of the light source unit. A light guide rod that is disposed near the condensing point of the reflected light by the reflector, guides light incident from the incident surface, and emits light having a uniform intensity distribution from the output surface, and one of the light guide rods from the rotation center. A color wheel arranged with its side intersecting the optical path of the light emitted from the light source unit, and a light reflected from the reflector among the light emitted from the light source unit, arranged close to the incident side surface of the color wheel. And a color wheel cover that blocks the light traveling in a direction different from the reflected light from the reflector. Of the emitted light, the light reflected in the light collecting direction by the reflector, that is, the light reflected by the reflector in the light collecting direction, and the intensity distribution is made uniform by the light guide rod and used for displaying the image display element. The incident light is incident on the color wheel, and the light traveling in a direction different from the reflected light by the reflector, that is, unnecessary light having a large spread angle directly emitted from the light source lamp can be blocked by the color wheel cover, Therefore, thermal deterioration of the color wheel due to light from the light source unit can be prevented.

  In this light source device, the color wheel cover has an area that covers the entire incident side surface of the color wheel, and a light transmission hole that partially transmits light reflected by the reflector out of light emitted from the light source unit. The light-shielding plate provided with is desirable, and by doing so, unnecessary light from the light source unit can be more reliably blocked.

  The color wheel cover is preferably made of a material having thermal conductivity, and the color wheel cover is preferably provided with a heat transfer portion to other members. Temperature rise of the color wheel cover due to heat of light can be suppressed, and radiant heat from the color wheel cover can be lowered to prevent thermal deterioration of the color wheel more effectively.

  In this light source device, the color wheel and the color wheel cover may be arranged on the incident side of the light guide rod with the emission side surface of the color wheel facing the incident surface of the light guide rod, or the light guide The color wheel cover may be disposed on the light exit side of the light rod so as to face the light exit surface of the light guide rod. In either case, the color wheel is prevented from being thermally deteriorated by light from the light source unit. Can do.

  In the light source device, the light source unit is fitted in a cylindrical explosion-proof cover that projects forward from the periphery of the opening of the reflector, and an opening at the front end of the explosion-proof cover. A light-shielding plate provided with a transparent explosion-proof glass fixed to a cover, having an area covering the entire outer surface of the explosion-proof glass, and a light transmission hole provided in a portion through which reflected light from the reflector passes. In this way, it is possible to reduce the emission of unnecessary light having a large spread angle from the light source unit, and to further effectively reduce the thermal deterioration of the color wheel by the synergistic effect with the color wheel cover. Can be prevented.

  In that case, the holding member of the explosion-proof glass is preferably formed of a material having thermal conductivity, and it is preferable that the holding member is provided with a heat transfer portion to other members. The temperature rise can be suppressed, and the radiant heat from the pressing member can be lowered.

  The projector according to the present invention includes an image display element that displays an image by controlling emission of incident light in a projector case provided with an intake unit that takes in outside air and an exhaust unit that discharges internal air. A projection lens that projects a display image of a display element onto an external projection surface, a light source device according to the present invention, and a light source side optical system that causes light emitted from the light source device to enter the image display element. In addition, according to this projector, it is possible to prevent thermal deterioration of the color wheel due to light from the light source unit of the light source device, so that the life of the color wheel can be extended and the maintenance cost can be reduced.

  In this projector, the color wheel cover of the light source device is formed of a material having thermal conductivity, and the color wheel cover is provided with a heat transfer portion to other members, and the heat transfer portion is connected to the projector case. In this way, the temperature of the color wheel cover due to the heat of unnecessary light from the light source unit is suppressed by heat transfer to the projector case, and the radiant heat from the color wheel cover is reduced. Thus, thermal deterioration of the color wheel can be more effectively prevented.

  In this projector, the light source unit of the light source device is fitted into a cylindrical explosion-proof cover that projects forward from the periphery of the opening of the reflector, and an opening at the front end of the explosion-proof cover, A transparent explosion-proof glass fixed to the explosion-proof cover, the pressing member has an area covering the entire outer surface of the explosion-proof glass, and a light transmission hole is provided in a portion through which reflected light from the reflector passes. It is desirable to use a light-shielding plate, and in this way, emission of unnecessary light having a large spread angle from the light source unit is reduced, and the thermal deterioration of the color wheel is further reduced by a synergistic effect with the color wheel cover. Can be effectively prevented.

  In that case, it is preferable that the holding member for the explosion-proof glass is formed of a material having thermal conductivity, and a heat transfer portion to the other member is provided on the holding member, and the heat transfer portion is connected to the projector case. By doing so, it is possible to suppress the temperature rise of the presser member by heat transfer to the projector case, to reduce the radiant heat from the presser member, and to eliminate the thermal influence on the surrounding electronic components and the like. it can.

  1 to 5 show an embodiment of the present invention. FIGS. 1 and 2 are a perspective view of a projector and a sectional view taken along a horizontal plane, and FIG. 3 is an enlarged view taken along a vertical plane of a light source device arrangement portion of the projector. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a plan view of the light source device.

  First, the projector shown in FIGS. 1 and 2 will be described. The projector includes an image display element 11 that displays an image by controlling the emission of incident light in a projector case 1 having a thin box shape, and the image display. A projection lens 12 that projects a display image of the element 11 onto an external projection surface (not shown), a light source device 14 that emits light incident on the image display element 11, and light emitted from the light source device 14 that emits light from the image display element 11 is provided with a light source side optical system 29 that is incident on the light source 11.

  The projection lens 12 is a zooming lens. The projection lens 12 has a lens optical axis directed in the front-rear direction of the projector case 1 in the vicinity of one of the left and right side surfaces of the projector case 1, and an emission end provided on the front surface of the projector case 1. The zooming operation unit 13 is disposed so as to face the projection window 2 and correspond to the zooming opening 3 provided on the side surface of the projector case 1.

  The image display element 11 is a reflective display element that reflects light incident from the display surface and emits the light from the display surface. In this embodiment, a plurality of micromirrors (not shown) are arranged in a row direction and a column. A micromirror display element having display areas arranged in a matrix in the direction is used. Hereinafter, the reflective image display element 11 is referred to as a micromirror display element.

  The micromirror display element 11 changes the reflection direction of light incident at a predetermined incident angle from an incident direction inclined in one direction with respect to the front direction by switching the tilt direction of the plurality of micromirrors. An image is displayed while being controlled in a slanting direction, and is arranged behind the projection lens 12 such that the emission direction of the image light reflected in the front direction is directed toward the incident end of the projection lens 12.

  The light source device 14 is an image light that is emitted from the micromirror display element 11 and incident on the projection lens 12 on the side opposite to the arrangement side of the micromirror display element 11 and the projection lens 12 in the projector case 1. The light source side that causes the light emitted from the light source device 14 to enter the micromirror display element 11 from its display surface between the light source device 14 and the micromirror display element 11. An optical system 29 is provided.

  In addition, an intake portion 5 for taking in outside air is provided on the side surface of the projector case 1 on the side where the micromirror display element 11 and the projection lens 12 are arranged, and on the opposite side, that is, on the side where the light source device 14 is arranged. An exhaust unit 6 for exhausting internal air is provided on the side surface, and a plurality of air-cooling units for forcibly exhausting the air in the projector case 1 are provided in the projector case 1 so as to correspond to the exhaust unit 6. Fans 7a, 7b, 7c are arranged.

  Furthermore, a sound emitting unit 8 and a keyboard 9 are provided on the upper surface of the projector case 1, and a speaker (not shown) is disposed in the projector case 1 so as to correspond to the sound emitting unit 8. A control unit including a power supply unit, a display element driving circuit, a light source driving circuit, a speaker driving circuit, a fan driving circuit, etc., avoiding the arrangement of the mirror display element 11, the projection lens 12, the light source device 14, and the light source side optical system 29. 10 is arranged.

  Next, the light source device 14 of the projector will be described. The light source device 14 comprises a light source lamp 16 and a concave reflector 17 whose front surface is open as shown in FIGS. A light source unit 15 that reflects the emitted light from the arranged light source lamp 16 in the condensing direction by the reflector 17 and emits it from an open portion on the front surface thereof, and a light guide rod arranged on the emission side of the light source unit 15 24 and a color wheel 25 arranged on the incident side of the light guide rod 24.

  The light source lamp 16 of the light source unit 15 is, for example, an ultra-high pressure mercury lamp, and is arranged in the reflector 17 with its axis line coincident with the center line of the reflector 17, and one end thereof is provided at the center of the rear end of the reflector. The lamp is inserted into the lamp insertion hole, and is supported by a lamp support 18 provided outside the center of the rear end of the reflector 17.

  The reflector 17 is a glass reflector in which a reflective film (not shown) is provided on the inner peripheral surface or outer peripheral surface of a reflector body made of heat-resistant glass, and the reflective surface reflects the radiated light from the light source lamp 16. It is formed in an elliptical spherical surface that reflects in the direction of focusing on one point on the center line and exits from the open part of the front surface of the reflector.

  The light source unit 15 is fitted into a cylindrical explosion-proof cover 19 projecting forward from the periphery of the opening of the reflector 17 and an opening at the front end of the explosion-proof cover 19. And a transparent explosion-proof glass 20 fixed to the explosion-proof cover 19 by a presser member 21 secured to the screw.

  In this embodiment, of the light radiated from the light source lamp 16 and reflected by the reflector 17 in the light collecting direction, the light reflected by the glass surface of the explosion-proof glass 20 and returned into the reflector 17 is transmitted to the light source lamp 16. In order to prevent the light source lamp 16 from being abnormally heated by condensing light, the explosion-proof glass 20 is provided obliquely with respect to the reflector center line.

  Although not shown in the figure, on the peripheral surface of the explosion-proof cover 19, an intake port and an exhaust for allowing cooling air flowing in the projector case 1 to flow into the reflector 17 and the explosion-proof cover 19 and air-cooling the inside thereof. Mouth is provided.

  Although not shown in the figure, lead wires for connecting the light source lamp 16 to the light source driving circuit of the control unit 10 are connected to both ends of the light source lamp 16, respectively. A lead wire connected to the inner lamp end is led out of the reflector 17 through a lead through hole provided in a part of the reflector 17. The projector case 1 is provided with a lamp replacement opening 1a that is opened by removing the cover plate 1b, corresponding to the arrangement part of the light source unit 15, on the bottom surface of the projector case 1. The light source unit is supported on a light source unit support plate 22 that can be taken out of the projector case 1 by means such as screws at the replacement port 1a, and the light source unit 16 is replaced when the light source lamp 16 is replaced. The unit support plate 22 is taken out of the case 1.

  The light source part fixing member 23 has a plate part fixed to the upper surface of the light source part support plate 22 and a light source part fixing plate having an opening corresponding to the open part of the reflector 17 erected on the plate part. The light source unit sandwiches the light source unit fixing plate between flanges provided on the outer periphery of the open end of the reflector 17 and the end of the explosion-proof cover 19 on the reflector side, and the reflector The flange portions of both the 17 and the explosion-proof cover 19 are fixed to the light source portion fixing plate by fastening with bolts.

  The light guide rod 24 is composed of a rectangular bar or a rectangular tube having a cross-sectional shape corresponding to the display area of the micromirror display element 11, and has a light incident surface 24a and an exit at one end and the other end. It has a surface 24b.

  The light guide rod 24 guides the light incident from the incident surface 24a at one end while reflecting the light from the interface between the rod outer peripheral surface and the outside air (air) or the reflection film formed on the rod outer peripheral surface, and the other exit surface. 24b emits light having a uniform intensity distribution. On the exit side of the light source unit 15, the rod central axis is made to coincide with the center line of the reflector 17, and the incident surface 24a is disposed on the reflector of the light source unit 15. 17 is located near the condensing point of the reflected light by 17.

  The color wheel 25 is composed of a rotating plate in which a plurality of color filters, for example, three color filters (not shown) of red, green, and blue are alternately arranged in the circumferential direction. The center is fixed to the rotation shaft of the wheel rotation motor 26.

  The color wheel 25 is rotationally driven at a high speed by the motor 26 and sequentially colors light emitted from the light source unit 15 into the three unit colors of red, green, and blue. The light guide rod 24 On the light incident side, the exit side surface of the color wheel 25 is opposed to the incident surface 24a of the light guide rod 24, and one side from the rotation center is arranged to intersect the optical path of the light emitted from the light source unit 15. ing.

  Further, the light source device 14 is disposed in the vicinity of the incident side surface (surface on the light source unit 15 side) of the color wheel 25, and transmits the light reflected by the reflector 17 out of the light emitted from the light source unit 15. And a color wheel cover 27 that blocks the light that enters the color wheel 25 and travels in a direction different from the light reflected by the reflector 17.

  The color wheel cover 27 has an area covering the entire incident side surface of the color wheel 25, and a light transmission hole 27 a through which the reflected light from the reflector 17 out of the light emitted from the light source unit 15 is partially transmitted. It consists of a light shielding plate provided.

  In this embodiment, the color wheel cover 27 is formed into a shape composed of a disk part having a slightly larger diameter than the color wheel 25 and an annular edge surrounding the outer periphery of the color wheel 25 formed at the peripheral part thereof. The light transmission hole 27a is formed in the disk portion.

  The color wheel cover 27 is made of a material having good thermal conductivity, for example, a stainless steel plate, and a heat transfer portion 27b to other members is provided at a part of the periphery thereof.

  In this embodiment, the heat transfer portion 27b of the color wheel cover 27 is formed in a strip shape extending downward from the lower edge portion of the color wheel cover 27, and the tip of the heat transfer portion 27b is formed on the projector case 1. Connected to the inner bottom surface with screws.

  The holding member 21 for fixing the explosion-proof glass 20 to the explosion-proof cover 19 of the light source unit 15 has an area covering the entire outer surface of the explosion-proof glass 20, and a light transmitting hole 21a is formed in a portion through which reflected light from the reflector 17 passes. It consists of a shading plate provided with.

  This explosion-proof glass pressing member 21 is made of a material having good thermal conductivity, for example, an aluminum plate, and a heat transfer portion 21b to other members is provided at a part of the peripheral edge thereof.

  In this embodiment, the heat transfer portion 27b of the explosion-proof glass presser member 21 is formed in a strip shape extending downward from the lower edge portion of the explosion-proof glass presser member 21, and the tip of the heat transfer portion 21b is the projector case. 1 is connected to the projector case 1 by being sandwiched between the edge of the lamp replacement opening 1a and the light source support plate 22.

  The light source device 14 includes a housing 28 that surrounds the light source unit 15, the light guide rod 24, and the color wheel 25 therebetween and above and on both sides. The housing 28 is formed by bending an aluminum plate or the like into a grooved plate shape whose lower surface is open, and both side edges of the open portion are screwed to the inner bottom surface of the projector case 1.

  The light source device 14 includes a light source unit 15 that reflects radiated light from the light source lamp 16 in a condensing direction by a reflector 17 and emits the light from an open portion on the front surface thereof, and an incident surface 24a on the emission side of the light source unit 15. The light guide rod 24 is disposed near the condensing point of the reflected light by the reflector 17 of the light source unit 15 and guides the light incident from the incident surface 24a and emits light having a uniform intensity distribution from the output surface 24b. And a color wheel 25 disposed on one side of the rotation center so as to intersect with the optical path of the light emitted from the light source unit 15, and disposed close to the incident side surface of the color wheel 25. Of the light emitted from the light, the light reflected by the reflector 17 is transmitted and incident on the color wheel 25, and the light traveling in a direction different from the light reflected by the reflector 17 is transmitted. Since it is provided with a color wheel cover 27 to be cut off, out of the light emitted from the light source unit 15, the utilization light reflected in the light collecting direction by the reflector, that is, reflected in the light collecting direction by the reflector 17. The light that has been made uniform in intensity distribution by the light guide rod 24 and used for display on the micromirror display element 11 is incident on the color wheel as indicated by the arrow in FIGS. 3 and 5, and the reflector is used. The light traveling in a direction different from the light reflected by the light source 17, that is, unnecessary light (not shown) having a large divergence angle directly emitted from the light source lamp 16 can be blocked by the color wheel cover 27. Thus, thermal deterioration of the color wheel 25 due to light from 15 can be prevented.

  In the light source device 14 of this embodiment, the color wheel cover 27 has an area covering the entire incident side surface of the color wheel 25, and the reflector of the light emitted from the light source unit 15 is partially included. Since the light-shielding plate is provided with the light transmission hole 27a through which the reflected light from 17 is transmitted, unnecessary light from the light source unit 15 can be blocked more reliably.

  Further, in this embodiment, the color wheel cover 27 is made of a material having thermal conductivity, and the color wheel cover 27 is provided with a heat transfer portion 27b to other members. The temperature of the color wheel cover 27 due to the heat of unnecessary light can be suppressed, and the radiant heat from the color wheel cover 27 can be lowered to prevent thermal deterioration of the color wheel 25 more effectively.

  The light source device 14 of this embodiment is fitted to the light source unit 15 in a cylindrical explosion-proof cover 19 that projects forward from the periphery of the open portion of the reflector 17 and an opening at the front end of the explosion-proof cover 19. And a transparent explosion-proof glass 20 fixed to the explosion-proof cover 19 by a holding member 21. The holding member 21 has an area covering the entire outer surface of the explosion-proof glass 20, and is reflected by the reflector 17. Since the light-shielding plate is provided with a light transmission hole 21a in the portion through which the light passes, the emission of unnecessary light having a large divergence angle from the light source unit 15 is reduced, and the color wheel is combined with the color wheel cover 27 due to a synergistic effect. The thermal degradation of 25 can be prevented more effectively.

  In this embodiment, the holding member 21 of the explosion-proof glass 20 is formed of a material having thermal conductivity, and the holding member 21 is provided with a heat transfer portion 21b to other members. The temperature rise of 21 can be suppressed, and the radiant heat from this pressing member 21 can be lowered.

  As shown in FIG. 2, the light source device 14 emits the light emission direction from the light source device 14 in the projector case 1 from the micromirror display element 11 and enters the projection lens 12. It is arranged toward the optical path of light.

  Further, the light source side optical system 29 that causes the light emitted from the light source device 14 to enter the micromirror display element 11 is colored by the color wheel 25 from the light source device 14 and has a uniform intensity distribution by the light guide rod 24. The condenser lens 30 that corrects the emitted light into parallel light, and the light emitted from the condenser lens 30 is reflected to the micromirror display element 11 at a predetermined incident angle (micromirror display element 11) from its display surface. The condenser lens 30 is emitted from the micromirror display element 11 and is incident on the projection lens 12. The reflector 31 is disposed between the optical path of the image light and the light source device 14, and the reflection plate 31 sandwiches the optical path of the image light. It is disposed on the opposite side to the arrangement side of the apparatus 14.

  Then, the projector makes unit light of three colors of red, green, and blue emitted from the light source device 14 colored by the color wheel 25 sequentially enter the micromirror display element 11 and the micromirror display element 11. By sequentially writing unit color image data of three colors of red, green, and blue in correspondence with the incidence periods of the unit color lights of three colors of red, green, and blue, the micromirror display element 11 A full-color image in which three unit color images of red, green, and blue are sequentially displayed, and the unit color images are sequentially projected onto an external projection surface so that the unit color images of red, green, and blue appear to overlap. Is displayed on the projection plane.

  This projector includes a micromirror display element 11 for controlling the emission of incident light and displaying an image in a projector case 1 provided with an intake section 5 for taking in outside air and an exhaust section 6 for discharging internal air. The projection lens 12 that projects the display image of the micromirror display element 11 onto an external projection surface, the light source device 14, and the light source side optical that causes the emitted light from the light source device 14 to enter the micromirror display element 11. According to this projector, since the thermal deterioration of the color wheel 25 due to light from the light source unit 15 of the light source device 14 can be prevented, the life of the color wheel 25 is extended. Maintenance costs can be reduced.

  In the projector of this embodiment, the color wheel cover 27 of the light source device 14 is formed of a material having thermal conductivity, and the color wheel cover 27 is provided with a heat transfer portion 27b to other members. Since the heat part 27b is connected to the projector case 1, the temperature of the color wheel cover 27 due to the heat of unnecessary light from the light source part 15 is suppressed by heat transfer to the projector case 1, and this color wheel cover The radiant heat from 27 can be lowered to prevent the color wheel 25 from being deteriorated more effectively.

  Further, the projector of this embodiment has a cylindrical explosion-proof cover 19 projecting forward from the periphery of the open portion of the reflector 17 to the light source unit 15 of the light source device 14 and an opening at the front end of the explosion-proof cover 19. A transparent explosion-proof glass 20 that is fitted and fixed to the explosion-proof cover 19 by a holding member 21, has an area that covers the entire outer surface of the explosion-proof glass 20, and is formed by the reflector 17. Since the light-shielding plate is provided with the light transmission hole 21a in the portion where the reflected light passes, the emission of unnecessary light having a large spread angle from the light source unit 15 is reduced, and due to the synergistic effect with the color wheel cover 27, The thermal deterioration of the color wheel 25 can be more effectively prevented.

  In this embodiment, the holding member 21 of the explosion-proof glass 20 is formed of a material having thermal conductivity, and the holding member 21 is provided with a heat transfer portion 21b to other members, and the heat transfer portion 21b is provided. Since it is connected to the projector case 1, the temperature rise of the explosion-proof glass pressing member 21 is suppressed by heat transfer to the projector case 1, the radiant heat from the explosion-proof glass pressing member 21 is lowered, and the surrounding electronic components, etc. The heat effect on can be eliminated.

  In the light source device 14 of the above embodiment, the color wheel 25 and the color wheel cover 27 are arranged on the incident side of the light guide rod 24. The color wheel 25 and the color wheel cover 27 are shown in FIG. As in another embodiment, the color wheel cover 27 may be disposed on the light exit side of the light guide rod 24 so as to face the light exit surface 24b of the light guide rod 24. It is possible to prevent thermal deterioration of the color wheel 25 due to light from the portion 15.

  Moreover, the light source device 14 of the said Example forms the color wheel cover 27 and the explosion-proof glass holding member 21 with the material which has heat conductivity, and provides the heat-transfer parts 27b and 21b to each other member in each. However, one or both of the color wheel cover 27 and the explosion-proof glass pressing member 21 may be formed of a heat insulating material, and in that case, it is not necessary to provide a heat transfer portion to other members.

  In the projector of the above embodiment, a micromirror display element is used as the image display element 11 for controlling the emission of incident light and displaying an image. However, the image display element may be a reflective liquid crystal display element. Furthermore, the image display element may be a transmissive liquid crystal display element, and the light source device 14 may be disposed on the rear side.

1 is a perspective view of a projector showing an embodiment of the present invention. Sectional drawing which follows the horizontal surface of the said projector. The expanded sectional view which follows the vertical plane of the light source device arrangement | positioning part of the said projector. Sectional drawing which follows the IV-IV line of FIG. The top view of the said light source device. The top view of the light source device which shows the other Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector case 5 ... Intake part, 6 ... Exhaust part, 7a, 7b, 7c ... Air-cooling fan, 11 ... Micromirror display element (image display element), 12 ... Projection lens, 14 ... Light source device, 15 ... Light source part 16 ... Light source lamp, 17 ... Reflector, 19 ... Explosion-proof cover, 20 ... Explosion-proof glass, 21 ... Explosion-proof glass pressing member, 21a ... Light transmission hole, 21b ... Heat transfer part, 24 ... Light guide rod, 24a ... Incident surface, 24b: emitting surface, 25 ... color wheel, 27 ... color wheel cover, 27a ... light transmitting hole, 27b ... heat transfer section, 29 ... light source side optical system.

Claims (11)

A light source unit including a light source lamp and a concave reflector whose front surface is opened, and a light source unit configured to reflect the emitted light from the light source lamp disposed in the reflector in a light collecting direction by the reflector and to emit the light from the front opening unit;
The light incident surface and the light exit surface are provided at one end and the other end, and on the light exit side of the light source unit, the incident surface is disposed near the condensing point of the reflected light by the reflector of the light source unit, A light guide rod that guides light incident from an incident surface and emits light having a uniform intensity distribution from the emission surface;
A color filter of a plurality of colors is composed of a rotating plate arranged alternately in the circumferential direction, and one side from the rotation center is arranged so as to intersect the optical path of the light emitted from the light source unit. A color wheel for sequentially coloring the emitted light into the plurality of colors;
Arranged close to the incident side of the color wheel, of the light emitted from the light source unit, the light reflected by the reflector is transmitted and incident on the color wheel, and is directed in a different direction from the light reflected by the reflector. A light source device comprising a color wheel cover for blocking light.   The color wheel cover has an area that covers the entire incident side surface of the color wheel, and includes a light shielding plate that is provided with a light transmission hole that partially transmits the reflected light from the reflector of the light emitted from the light source unit. The light source device according to claim 1, wherein:   The light source device according to claim 1 or 2, wherein the color wheel cover is made of a material having thermal conductivity, and the color wheel cover is provided with a heat transfer portion to other members.   2. The light source according to claim 1, wherein the color wheel and the color wheel cover are arranged on an incident side of the light guide rod with an emission side surface of the color wheel facing the incident surface of the light guide rod. apparatus.   2. The light source device according to claim 1, wherein the color wheel and the color wheel cover are arranged on an emission side of the light guide rod so that the color wheel cover is opposed to an emission surface of the light guide rod.   The light source unit includes a cylindrical explosion-proof cover that projects forward from the periphery of the opening of the reflector, and a transparent explosion-proof glass that is fitted to the opening at the front end of the explosion-proof cover and is fixed to the explosion-proof cover by a pressing member. The holding member has an area covering the entire outer surface of the explosion-proof glass, and is composed of a light shielding plate provided with a light transmission hole in a portion through which reflected light from the reflector passes. The light source device according to claim 1.   The light source device according to claim 6, wherein the holding member of the explosion-proof glass is made of a material having thermal conductivity, and the holding member is provided with a heat transfer portion to other members. In the projector case provided with an intake part that takes in outside air and an exhaust part that discharges internal air,
An image display element for controlling the emission of incident light to display an image;
A projection lens that projects a display image of the image display element onto an external projection surface;
A light source unit including a light source lamp and a concave reflector whose front surface is opened, and a light source unit configured to reflect the emitted light from the light source lamp disposed in the reflector in a light collecting direction by the reflector and to emit the light from the front opening unit; The light incident surface and the light exit surface are provided at one end and the other end, and on the light exit side of the light source unit, the incident surface is disposed near the condensing point of the reflected light by the reflector of the light source unit, It consists of a light guide rod that guides light incident from the incident surface and emits light with a uniform intensity distribution from the output surface, and a rotating plate in which a plurality of color filters are alternately arranged in the circumferential direction. A color wheel that is arranged so that one side from the center intersects the optical path of the light emitted from the light source unit, and sequentially colors the light emitted from the light source unit into the plurality of colors, and close to the incident side surface of the color wheel A color wheel cover that transmits light reflected from the reflector and enters the color wheel out of light emitted from the light source unit, and blocks light traveling in a direction different from the light reflected by the reflector; A light source device comprising:
A projector comprising: a light source side optical system that causes light emitted from the light source device to enter the image display element.   The color wheel cover of the light source device is made of a material having thermal conductivity, the color wheel cover is provided with a heat transfer part to other members, and the heat transfer part is connected to the projector case. The projector according to claim 8.   The light source unit of the light source device includes a cylindrical explosion-proof cover that protrudes forward from the periphery of the opening of the reflector, and a transparent member that is fitted to the opening of the front end of the explosion-proof cover and is fixed to the explosion-proof cover by a pressing member. An explosion-proof glass, and the pressing member has an area covering the entire outer surface of the explosion-proof glass, and is made of a light shielding plate provided with a light transmission hole in a portion through which reflected light from the reflector passes. The projector according to claim 8 or 9, characterized in that   The explosion-proof glass holding member is made of a material having thermal conductivity, the holding member is provided with a heat transfer portion to other members, and the heat transfer portion is connected to a projector case. The projector according to claim 10.

Images