JP2005234424A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of effectively air-cooling the inside of a projector case with exhaust efficiency corresponding to the air sending force of a ventilating fan without generating wind whistle. <P>SOLUTION: A light source 17, a display element 28 displaying a picture by controlling the emission of incident light, an optical system 29 making emitted light from the light source 17 incident on the display element 28, and a projection lens 45 projecting the emitted light from the display element 28 to a projection surface are provided in the projector case 1 having suction parts 56 and 57 and an exhaust part 60 where a plurality of exhaust holes 62a are arrayed, and the exhaust part 60 is provided at an aperture part 64 formed on the case 1 so as to project to the outside of the case 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a projector that includes a display element and projects the display image to the outside.

  A projector that includes a display element and projects a display image thereof includes a light source, a display element that displays an image by controlling emission of incident light, and light emitted from the light source incident on the display element. And a projection lens for projecting the light emitted from the display element to the outside of the projector case.

In this projector, since the heat generation temperature of the light source is very high, an air intake unit and an exhaust unit are provided in the projector case, and an exhaust fan is disposed in the vicinity of the exhaust unit in the projector case so as to face the exhaust unit. Thus, the inside of the projector case is forcibly cooled by air (see Patent Document 1).
JP-A-8-314011

  However, the conventional projector has a nonuniformity in the wind pressure distribution in the cross section of the exhaust flow by the exhaust fan, and the exhaust flow by the exhaust fan disposed in the vicinity of the projector case facing the exhaust portion of the projector case. In addition, when the exhaust part is partially hit with a strong wind pressure, a vortex is generated in the exhaust flow from the exhaust hole of the part, so that not only the exhaust efficiency corresponding to the blowing power of the exhaust fan can be obtained, but also a large wind noise Is generated.

  An object of the present invention is to provide a projector capable of effectively cooling the interior of a projector case with an exhaust efficiency that matches the air blowing power of an exhaust fan and reducing wind noise in the exhaust section. .

  The projector according to the present invention includes a light source, a display element that displays an image by controlling emission of incident light, and an output from the light source in a projector case having an air intake unit and an exhaust unit in which a plurality of exhaust holes are arranged. An optical system that makes incident light incident on the display element, a projection lens that projects the emitted light from the display element to the outside of the projector case, and an exhaust fan that is disposed in the vicinity of the exhaust unit so as to face the exhaust unit, In addition, the exhaust portion is provided in an opening formed in the projector case so as to protrude outside the projector case.

  Further, the projector detects the protrusion of the exhaust part outside the projector case when the power is turned on, starts the lighting of the light source and the driving of the exhaust fan, and when the protrusion of the exhaust part is not detected, It is desirable to provide safety means for instructing the user to project the exhaust part without starting lighting and driving the exhaust fan.

  When the safety means no longer detects the protrusion of the exhaust part during the lighting of the light source and the driving of the exhaust fan, the safety means continues the lighting of the light source and the driving of the exhaust fan, It is preferable to indicate the protrusion.

  In this projector, the display element is disposed on one side portion in the projector case, the light source is disposed on the other side portion in the projector case, and the exhaust portion is disposed on the projector case. It is preferable that the light source is provided on the side surface on which the light source is disposed, and the air intake portion is provided on the other surface of the projector case.

  In this projector, the peripheral surfaces of the plurality of exhaust holes formed in the exhaust panel and the boundary portions between both side edges thereof and the inner surface and the outer surface of the exhaust panel are surfaces perpendicular to or close to the exhaust flow direction. It is desirable to form in a shape that does not exist.

  The peripheral surface of the exhaust hole is preferably formed in a shape that is curved or inclined in a direction in which the hole width increases from the center in the depth direction toward the inner surface and the outer surface of the exhaust panel.

  Further, the exhaust hole is a long hole, and two surfaces of the peripheral surface along the length direction of the exhaust hole are respectively from the inner surface side to the outer surface side of the exhaust panel. It is preferably formed in a shape inclined in one direction orthogonal to the length direction.

  In that case, the exhaust panel is detachably attached to an opening end outside the case of the exhaust cylinder that is movably fitted in the opening of the projector case, and extends in a direction perpendicular to the length direction of the exhaust hole. It is desirable that the both side edges are reversed to be detachable.

  In the projector according to the present invention, since the exhaust part of the projector case is provided in the opening formed in the projector case so as to protrude outside the projector case, the exhaust part protrudes outside the projector case. Accordingly, the distance from the exhaust fan disposed in the vicinity of the projector case so as to face the exhaust unit to the exhaust unit is increased, and the exhaust flow caused by the exhaust fan causes the wind pressure to be substantially over the entire cross section. The averaged air flow can be applied to the entire exhaust portion with a substantially uniform wind pressure.

  Therefore, according to this projector, it is possible to prevent the exhaust part from being exposed to an exhaust flow having a strong wind pressure and generating a vortex in the exhaust flow from the exhaust hole of the part, and the inside of the projector case is used as the ventilation force of the exhaust fan. Air cooling can be effectively performed with an appropriate exhaust efficiency, and wind noise in the exhaust section can be reduced.

  In addition, when the projector is not in use, the projector can be stored or carried without having an obtrusive protrusion by storing the exhaust unit in the opening of the projector case.

  In this projector, the exhaust part has a length larger than a projecting stroke to the outside of the projector case, and an exhaust cylinder fitted into the opening of the projector case so as to be movable inward and outward of the case, and a plurality of exhaust pipes It is preferable that the exhaust panel is formed by an exhaust panel provided at an opening end outside the case of the exhaust cylinder. By doing so, air that has been heated in the projector case The air can be exhausted from the exhaust part without flowing out in the peripheral direction.

  Further, the projector detects the protrusion of the exhaust part outside the projector case when the power is turned on, starts the lighting of the light source and the driving of the exhaust fan, and when the protrusion of the exhaust part is not detected, It is desirable to provide safety means for instructing the user to project the exhaust part without starting the lighting and driving of the exhaust fan, and in this way, the exhaust part can be exhausted in a state where the exhaust part cannot be projected. It is possible to prevent a large wind noise caused by driving the fan and to prevent an abnormal temperature rise in the projector case caused by turning on the light source without driving the exhaust fan.

  When the safety means no longer detects the protrusion of the exhaust part during the lighting of the light source and the driving of the exhaust fan, the safety means continues the lighting of the light source and the driving of the exhaust fan, It is preferable to instruct the protrusion. By doing so, for example, when the exhaust unit is accidentally moved in the projector case during image projection, the exhaust is promptly stopped without stopping the image projection. The part can be returned to the protruding position again.

  In this projector, the display element is disposed on one side portion in the projector case, the light source is disposed on the other side portion in the projector case, and the exhaust portion is disposed on the projector case. It is preferable that the light source is provided on the side surface on which the light source is disposed, and the air intake portion is provided on the other surface of the projector case. With such a configuration, high-temperature air near the light source that is a heat generation source is provided. The projector case can be air-cooled quickly, and outside air can be taken in from an area avoiding the vicinity of the light source to cool the projector case more effectively.

  In this projector, the peripheral surfaces of the plurality of exhaust holes formed in the exhaust panel and the boundary portions between both side edges thereof and the inner surface and the outer surface of the exhaust panel are surfaces perpendicular to or close to the exhaust flow direction. In this way, it is more effective to prevent a vortex from being generated in the exhaust flow from the exhaust hole, to cool the projector case more effectively and to cool the exhaust case. Wind noise can be further reduced.

  The peripheral surface of the exhaust hole is preferably formed in a shape that is curved or inclined in a direction in which the hole width increases from the center in the depth direction toward the inner surface and the outer surface of the exhaust panel. As a result, it is possible to substantially completely prevent the vortex from being generated in the exhaust flow from the exhaust hole, to further effectively cool the inside of the projector case, and to substantially eliminate wind noise in the exhaust section.

  Further, the exhaust hole is a long hole, and two surfaces of the peripheral surface along the length direction of the exhaust hole are respectively from the inner surface side to the outer surface side of the exhaust panel. Preferably, it is formed in a shape that is inclined in one direction orthogonal to the length direction of the projector. By doing so, it is possible to substantially completely prevent a vortex from being generated in the exhaust flow from the exhaust hole, and The inside can be effectively air-cooled, almost no wind noise in the exhaust part can be eliminated, and the exhaust from the exhaust part can be discharged in one direction orthogonal to the length direction of the exhaust hole.

  In that case, the exhaust panel is detachably attached to an opening end outside the case of the exhaust cylinder that is movably fitted in the opening of the projector case, and extends in a direction perpendicular to the length direction of the exhaust hole. It is desirable that the direction of the both side edges is reversed so that it can be mounted. By doing so, the direction of the exhaust discharged from the exhaust hole is set to one direction orthogonal to the length direction of the exhaust hole and the other direction. The direction can be arbitrarily selected.

  1 to 5 show a first embodiment of the present invention. FIGS. 1 and 2 are external perspective views of the projector in use and non-use, FIG. 3 is a cross-sectional plan view of the projector, and FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.

  This projector has a light source 17 and a display area in which a plurality of pixels are arranged in a matrix in a row direction and a column direction in a projector case 1 having a rectangular planar shape, and light incident on the plurality of pixels. The display element 28 for controlling the emission of light, displaying the image, the light source side optical system 29 for making the light emitted from the light source 17 incident on the display element 28, and the light emitted from the display element 28 outside the projector case 1. For example, a projection lens 45 that projects onto a projection surface such as an external screen (not shown) is disposed.

  The projector case 1 includes a case main body 1a that constitutes both side surfaces, a rear surface, and a bottom surface, a top panel 1b, and a front panel 1c. On the rear surface, a USB terminal and a color image signal for a personal computer are provided. An audio signal input terminal, a video signal input terminal, and a power connector (all not shown) are provided.

  Further, on the upper surface of the projector case 1, a power key 2, a light source lighting indicator 3, a light source overheat indicator 4, an automatic image quality adjustment key 5a, a manual image quality adjustment key 5b, and a standby in which the power connector is connected to a commercial power source. A power / standby indicator 6 whose lighting color changes depending on the state and when the power key 2 is turned on, and various information such as lighting of the light source, light source overheating, image quality adjustment menu, presence / absence of an external input signal, and the like are displayed. A use state display unit 7, various adjustment keys (not shown) that are operated by opening the opening / closing lid 8, and a sound emitting unit 9 for speakers are provided on the front surface, and a remote control that receives an infrared signal from a remote controller (not shown) A receiving unit 10 is provided.

  A projection port 11 having a projection lens cover 12 that can be opened and closed is provided on one side of the front surface of the projector case 1. An opening is formed in the center of the projection lens cover 12, and a red translucent plate 13 is provided in the opening, for example.

  Further, on the bottom surface of the projector case 1, a pair of left and right rear foot members 14a disposed on both sides of the rear region, and a position slightly rearward from the front edge of the case near the center of the front region. One forefoot member 14b is provided.

  The rear foot member 14a and the front foot member 14b support the projector case 1 in an obliquely upward state with the front side thereof being raised when the projector is used (during projection). The pair of rear foot members 14a The forefoot member 14b is held by a leg locking mechanism (not shown) provided in the projector case 1 so as to be slidable in the vertical direction. The rod leg 15 is fixed to the lower end of the rod leg 15 so that the protruding height from the bottom of the case can be adjusted.

  The leg lock mechanism unlocks the rod leg 15 by depressing a lock release knob 16 provided on the front panel 1c, and automatically activates by a spring force when the lock release knob 16 is released. The rod leg 15 is locked to the projector case 1 so that when the projector is used, the lock release knob 16 is pushed down so that the rod leg 15 can be freely lowered together with the forefoot member 14b by its own weight, In this state, after the front side of the projector case 1 is lifted and the projection direction of the projection lens 45 is adjusted to the projection surface, the lock release knob 16 is released and the rod leg 15 is locked, thereby Supported by the state.

  Next, the light source 17 will be described. As shown in FIGS. 3 and 4, the light source 17 has a light source lamp 18 and an open surface for emitting light, and the light source lamp 18 is disposed inside. Reflector 21 that reflects the emitted light and emits it from the open surface, and an explosion-proof glass 22 disposed on the front side of the open surface of the reflector 21.

  The light source lamp 18 includes a pair of rod-like electrodes 20a and 20b made of molybdenum or the like in a glass bulb 19 having a spherical bulge portion at an intermediate portion thereof, with respective tips close to and opposed to each other in the bulge portion. A high pressure mercury lamp or the like in which a portion is provided to be exposed outside the glass bulb 19 from both ends of the glass bulb 19, and a substance that emits light by an arc generated between the tips of the electrodes 20 a and 20 b is enclosed in the glass bulb 19. This is a short arc lamp.

  The reflector 21 is an ellipsoidal reflector having a focal point at a point in the reflector on the axis and a point in front of the open surface, and the hollow ellipsoidal sphere is cut perpendicularly to the major axis. The heat-resistant glass reflector body having a shape has a configuration in which an ultraviolet transmissive reflective film 21a is provided on the entire inner surface of the reflector body.

  The light source lamp 18 has one end side positioned in the reflector 21 and the other end side projected from the opening provided at the center of the inner back surface of the reflector 21 to the rear side of the reflector 21. The glass bulb 19 is provided such that the axis of the glass bulb 19 coincides with the axis of the reflector 21, and the light emitting point between the tips of the pair of electrodes 20 a, 20 b coincides with the focal point inside the reflector 21.

  The explosion-proof glass 22 has an ultraviolet filter function. In this embodiment, the explosion-proof glass 22 is provided with an ultraviolet reflection film 23 on one surface and a low reflection film 24 on the other surface. Yes.

  In FIGS. 3 and 4, the explosion-proof glass 22 is provided with the ultraviolet reflection film 23 formed surface facing the reflector 21 and the low reflection film 24 formed surface facing the emission side. Contrary to the figure, 22 may be provided with the formation surface of the low reflection film 24 facing the reflector 21 and the formation surface of the ultraviolet reflection film 23 facing the emission side.

  Further, the light source 17 includes a cylindrical explosion-proof cover 25 made of a metal cylinder or a heat-resistant resin cylinder disposed on the front side of the open surface of the reflector 21.

  The explosion-proof cover 25 has a non-reflective treatment applied to the entire inner peripheral surface of a tapered cylindrical body that is open at both ends and has a large diameter from one end side to the other end side. The opening edge of the diameter side end is formed perpendicular to the axis of the explosion-proof cover 25, and the other end, that is, the opening edge of the small diameter side end is an inclined surface inclined at a predetermined angle with respect to the plane perpendicular to the axis. Is formed.

  The explosion-proof cover 25 is provided by connecting the peripheral edge of one end (large-diameter side end) to the peripheral edge of the open surface of the reflector 21 by means such as screws. On the inner circumference of the end (small diameter side end), the explosion-proof glass 22 is inclined at a predetermined angle in one direction with respect to the optical axis of the light emitted from the reflector 21, that is, the plane perpendicular to the axis of the reflector 21. Are mated.

  The explosion-proof cover 25 has ventilation holes 26 for air-cooling the internal space of the reflector 21 and the light source lamp 18 on one side and the other side of the peripheral surface on the connection end side to the reflector 21. 27 is provided.

  On the other hand, the display element 28 (see FIG. 3) is a display element that does not have a means for coloring incident light such as a color filter. In this embodiment, a micromirror display element (Digital Micromirror) generally abbreviated as DMD. Device). Hereinafter, the display element 28 is referred to as a micromirror display element.

  Although the configuration of the micromirror display element 28 is not shown, each pixel is formed by a micromirror that is tilted in one tilt direction and the other tilt direction by a CMOS-based mirror driving element. These micromirrors are made of ultrathin metal pieces (for example, aluminum pieces) having a vertical and horizontal width of 10 μm to 20 μm.

  The micromirror display element 28 converts light incident at an incident angle within a predetermined angle range from an incident direction inclined in one direction with respect to the front direction to the front direction by switching the inclination directions of the plurality of micromirrors. Reflects the image in an oblique direction and displays an image. Light incident on the micromirror tilted in one tilt direction is reflected in the front direction by this micromirror and tilted in the other tilt direction. The light incident on is reflected by the micromirror in an oblique direction, and an image is displayed by bright display by reflection in the front direction and dark display by reflection in the oblique direction.

  The brightness of the bright display can be arbitrarily changed by controlling the time during which the micromirror is tilted in the one tilt direction (the tilt direction in which incident light is reflected in the front direction). The micromirror display element 28 can display an image with gradation in brightness.

  The micromirror display element 28 is arranged on one side of the rear region in the projector case 1 with its front direction facing the projection port 11 provided on one side of the front surface of the projector case 1. Yes.

  Further, as shown in FIGS. 3 and 4, the light source side optical system 29 that causes the light emitted from the light source 17 to enter the micromirror display element 28 converts the light emitted from the light source 17 into red, green, and blue. A color wheel 30 for sequentially coloring the three colors, a light guide rod 33 for making the intensity distribution of the light emitted from the light source 17 uniform, and a color wheel 30 that is colored by the light guide rod 33. It consists of two light source side lenses 34 and 35 and a mirror 37 before and after projecting light having a uniform intensity distribution toward the front surface of the micromirror display element 28.

  The color wheel 30 is composed of a rotating plate in which fan-shaped three color filters 31R, 31G, and 31B of red, green, and blue are arranged in the circumferential direction, the center of which is emitted light from the light source 17 It is fixed to the rotating shaft of the color wheel rotation motor 32 arranged on the side of the optical path, and is arranged with a part in the wheel circumferential direction interposed in the optical path of the emitted light from the light source 17.

  The color wheel 30 is rotationally driven at high speed by the motor 32 so that the three color filters 31R, 31G, and 31B sequentially traverse the optical path of the emitted light from the light source 17.

  The light guide rod 33 has a cross-sectional shape similar to the outer shape of the display area in which a plurality of pixels of the micromirror display element 28 are arranged in a matrix, and has a reflection film (not shown) on the entire inner peripheral surface. 1), an incident surface for entering light is formed at one end, and an exit surface for light incident from the incident surface is formed at the other end.

The light guide rod 33 guides the light incident from the incident surface while being reflected by the reflection film on the inner peripheral surface of the rod, and emits light having a uniform intensity distribution from the output surface. Is arranged such that the incident surface is opposed to the light source 17 via the color wheel 30 on the emission side of the color wheel 30 and is emitted from the open surface of the reflector 21 of the light source 17 and obliquely toward the front side of the reflector. In order to make the light refracted and transmitted through the explosion-proof glass 22 disposed at an angle enter the incident surface, the optical axis of the light transmitted through the explosion-proof glass 22, that is, the light emitted from the open surface of the reflector 21. the optical axis is arranged to match the rod center axis to the optical axis O ₂ was shifted parallel to the (refraction direction of the explosion-proof glass 22) in one direction with respect to O ₁ (the axis of the reflector 21) That.

In addition, the light source side lenses 34 and 35 are arranged in a lens support cylinder 36 disposed on the light exit side of the light guide rod 33, and the lens center extends from the light source rod 33, that is, from the light source 17. Are arranged so as to coincide with the optical axis O ₂ of the emitted light (light emitted through the explosion-proof glass 22).

  In this embodiment, a cylindrical light guide rod support portion is formed on the incident side of the lens support tube 36, and a side portion corresponding to the arrangement portion of the color wheel rotation motor 32 is notched. The light guide rod 33 is fitted in the rod support portion.

  The light guide rod 33 is formed of a transparent rectangular bar having a cross-sectional shape similar to the display area of the micromirror display element 28, and light incident from one incident surface is the rod outer peripheral surface and the outside air. The light guide rod may be guided while being totally reflected at the interface with the air layer and emit light having a uniform intensity distribution from the exit surface at the other end. In this case, the inner diameter of the light guide rod support portion of the lens support tube 36 is increased. And the light guide rod which consists of the said square rod-shaped body should just arrange | position the space between the inner peripheral surface in the said light guide rod support part.

  The reflector 21 of the light source 17, the color wheel rotation motor 32 of the light source side optical system 29, and the lens support cylinder 36 that supports the light guide rod 33 and the light source side lenses 34 and 35 are open at both ends. 38 is fixed in a predetermined positional relationship.

As shown in FIGS. 3 and 4, the light source side housing 38 is disposed on the micromirror in both side surfaces of the projector case 1 in the region from the center to the rear side in the front-rear direction in the projector case 1. The light source 17 is directed to the side opposite to the display element 28 side, the exit end of the lens support tube 36 is opposed to the area in the front direction of the micromirror display element 28, and the light source 17. The optical axis O ₂ of the emitted light from the light is installed so as to be substantially orthogonal to the front direction of the micromirror display element 28.

The mirror 37 of the light source side optical system 29 is a plane mirror. The mirror 37 has openings 40, 41, 42 on one side, a rear surface, and a front surface. The front end of the micromirror display element 28 is inserted into a mirror housing 39 installed in the projector case 1 with the exit end of the lens support tube 36 inserted and the rear opening 41 facing the micromirror display element 28. The color wheel 30 is opposed to the emission end of the lens support cylinder 36 across an area, is inclined at a predetermined angle with respect to the optical axis O ₂ of the light emitted from the light source 17, and is emitted from the light source 17. The light transmitted through the light guide rod 33 and the light source side lenses 34 and 35 is reflected toward the micromirror display element 28, and the reflected light is reflected on the micromirror. -It arrange | positions so that it may project on the display element 28 from the direction inclined in one direction with respect to the front direction.

  On the other hand, a cover glass 43 that protects the micromirror display element 28 is disposed on the front surface of the micromirror display element 28, and is provided on the front side of the opening on the rear surface of the mirror housing 39. The light emitted from the light source 17 and projected from the light source side optical system 29 to the micromirror display element 28 from a direction inclined in one direction with respect to the front direction is predetermined with respect to the front direction of the micromirror display element 28. A relay lens 44 for correcting the parallel light along the inclined direction to enter the micromirror display element 28 and allowing the image light emitted from the micromirror display element 28 to enter the projection lens 45 is disposed.

  The relay lens 44 has a characteristic of emitting the light reflected on the surface of the relay lens surface out of the projection light from the light source side optical system 29 in a direction other than the projection direction by the projection lens 45.

  The relay lens 44 is a meniscus lens having one surface formed as a convex surface and the other surface formed as a concave surface. The convex surface is opposed to the micromirror display element 28, and the concave surface is the light source side optical. The lens 29 is opposed to the system 29 and the projection lens 45 and the center of the lens is the edge of the display area of the micromirror display element 28 opposite to the direction in which the projection light from the light source side optical system 29 enters. It is arranged to face the vicinity of the center.

  The concave surface facing the light source side optical system 29 and the projection lens 45 of the relay lens 44 is a projection direction by the projection lens 45 of the light reflected from the concave surface of the projection light from the light source side optical system 29. The convex surface that is formed on a surface having a curvature that is emitted in a direction other than the above and that faces the micromirror display element 28 is configured to cause projection light from the light source side optical system 29 to be formed into the concave surface and the convex surface based on the curvature of the concave surface. The light is refracted in a direction inclined by a predetermined angle with respect to the front direction of the micromirror display element 28 and is incident on the micromirror display element 28, and light emitted from the micromirror display element 28 in the front direction is the convex and concave surfaces. And is formed on a surface having a curvature to be refracted and incident on the projection lens 45.

  The effective area of the relay lens 44 is a part corresponding to the display area of the micromirror display element 28 in the circular lens, and the other part is an ineffective area. In this embodiment, the circular lens A relay lens 44 having a shape obtained by cutting off the ineffective area is used.

  The projection lens 45 includes an incident-side fixed lens barrel 46 and an emission-side movable lens barrel 47 that is engaged with the fixed lens barrel 46 and moves forward and backward in the axial direction by a rotation operation. 46 and 47 are variable focus lenses provided with lens groups 48 and 49 each formed by combining a plurality of lens elements. The projection lens 45 has a base end of a fixed lens barrel 46 at the base of the mirror housing. The fixed lens barrel 46 is inserted into the opening 42 on the front surface 39, the incident end of the fixed lens barrel 46 is opposed to the micromirror display element 28 via the relay lens 44, and the output end of the movable lens barrel 47 is connected to the projector case 1. The projector case 1 is movably fitted in a projection port 11 provided on one side of the front surface and is disposed in the projector case 1.

  On the side surface of the projector case 1 on the side where the projection lens is disposed, the movable lens barrel 47 of the projection lens 45 is manually rotated and moved in the axial direction to adjust the focus of the projection lens 45. Is provided.

  In the projector case 1, a display / audio system circuit board 51 is arranged in a standing state between a rear surface portion and the light source side housing 38. A USB terminal (not shown) provided on the rear surface of the projector case 1, an input terminal for color image signals and audio signals, a video signal input terminal, the micromirror display element 28, and a speaker for the upper surface in the projector case 1. A speaker (not shown) disposed to face the sound unit 9 is connected.

  Further, in the space on the front side of the light source side housing 38 in the projector case 1, a power system circuit board 52 connected to a power connector (not shown) provided on the rear surface of the projector case 1 is disposed horizontally. The power source circuit board 52 is connected to the light source lamp 18 of the light source 17 via lead wires 53a and 53b connected to the exposed portions of the pair of electrodes 20a and 20b, respectively, and the color wheel rotation motor. 32 is connected via a lead wire (not shown).

  Of the pair of electrodes 20 a and 20 b of the light source lamp 18, the lead wire 53 a connected to the exposed portion of the electrode 20 a inside the reflector 21 is drawn out of the reflector 21 through a lead insertion hole provided in the reflector 21. Further, it is pulled out from the end of the light source side housing 38 and connected to the power system circuit board 52.

  In the projector case 1, a projector control circuit board 54 is horizontally disposed between the upper surface of the projector case 1 and the light source side housing 38 and the mirror housing 39. The audio system circuit board 51 and the power system circuit board 52, the power key 2 provided on the upper surface of the projector case 1, the light source lighting indicator 3, the light source overheat indicator 4, the automatic image quality adjustment key 5a, the manual image quality adjustment key 5b, and the power / A standby indicator 6, various adjustment keys operated by opening the opening / closing lid 8, a receiving element (not shown) provided in the projector case 1 facing the remote control receiving unit 10 on the front surface thereof, and the light source side housing 38 Connected to the light source temperature measuring sensor (not shown) disposed in the vicinity of the reflector 21

  The usage state display unit 7 on the upper surface of the projector case 1 includes a display window provided on the upper surface of the projector case 1 and a display panel (not shown) disposed in the projector case 1 so as to face the display window (for example, Liquid crystal display panel) and a drive circuit thereof, and the drive circuit is connected to the projector control circuit board 54.

  Further, the projector case 1 has intake portions 55, 56, 57 and an exhaust portion 60 for air-cooling the projector case 1.

  The intake portions 55, 56, and 57 are provided on the bottom surface of the projector case 1, the side surface of the projector case 1 on the side where the projection lens 45 is disposed, and the rear surface of the projector case 1. The portions 55, 56, and 57 are respectively formed in the projector case 1 by providing a plurality of air intake holes 55 a, 56 a, and 57 a that are long holes at close intervals.

  The light source side housing 38 and the power system circuit board 52 are arranged with a ventilation space between the bottom surface portion of the projector case 1 and a plurality of intake holes 55a forming the intake portions 55 on the bottom surface of the case. Are provided on the lower side of the light source side housing 38 and the power supply system circuit board 52 at dense intervals, respectively. Note that the lower intake hole of the power circuit board 52 is not shown.

  The projection lens 45 is disposed with a ventilation space between the side surface portion of the projector case 1 and a plurality of air intake holes 56a forming the air intake portion 56 on the side surface of the case are projected on the side surface of the case. The lens focus adjustment openings 50 are provided at a close interval over substantially the entire rear portion of the lens focus adjustment opening 50.

  Further, the display / audio system circuit board 51 is disposed with a ventilation space between the display case and the upper surface portion of the projector case 1, and a plurality of intake holes 57a forming the intake portions 57 on the rear surface of the case are provided with The portions corresponding to the arrangement portions of the micromirror display elements 28 are provided at a close interval.

  Of the intake portion 55 on the bottom surface of the case, a portion (not shown) provided on the lower side of the power circuit board 52 and the intake portion 56 on the side surface of the case are respectively a natural intake portion and an intake portion 55 on the bottom surface of the case. An air intake portion 57 provided in a lower portion of the light source side housing 38 and a portion corresponding to the arrangement portion of the micromirror display element 28 on the rear surface of the case is a forced air intake portion. The intake fans 58 and 59 are arranged to face the forced intake portions 55 and 57, respectively.

  On the other hand, the exhaust part 60 is provided so as to protrude outside the projector case 1 in an opening part 64 formed on the side surface of the projector case 1 on the side where the light source 17 is disposed.

  The opening 64 is formed on substantially the entire side surface of the projector case 1, and the exhaust unit 60 is provided on the substantially entire side surface of the projector case 1.

  The exhaust part 60 has a length longer than the projecting stroke to the outside of the projector case 1 and is a rectangular cylindrical exhaust pipe fitted in the opening 64 of the projector case 1 so as to be movable inward and outward of the case. 61 and a plurality of exhaust holes 62a are arranged at close intervals, and is constituted by a rectangular plate-like exhaust panel 62 provided at an opening end outside the case of the exhaust cylinder 61.

  The plurality of exhaust holes 62a formed in the exhaust panel 62 are long holes, and the boundary between the peripheral surface of these exhaust holes 62a and both side edges thereof and the inner surface and outer surface of the exhaust panel 62 is in the exhaust flow direction. Is formed in a shape having no surface perpendicular to or close to the angle.

  FIG. 5 is an enlarged cross-sectional view of the exhaust hole 62a. In this embodiment, the cross-sectional shape of the portion between the adjacent exhaust holes 62a of the exhaust panel 62 is a horizontally long rhombus, that is, the thickness direction of the exhaust panel 62. Is formed in a rhombus shape whose diagonal length is larger than the diagonal length in the direction parallel to the plate surface of the exhaust panel 62, so that the circumferential surface of the plurality of exhaust holes 62a is arranged in the depth direction (thickness direction of the exhaust panel 62). Are formed in a chevron surface shape inclined in the direction in which the hole width increases toward the inner surface and the outer surface of the exhaust panel 62 from the center portion thereof, and the peripheral surface and both side edges of the exhaust hole 62a and the inner surface and the outer surface of the exhaust panel 62 The boundary portion is formed into a shape having no surface perpendicular to or close to the exhaust flow direction.

  Further, on the side of the projector case 1 where the exhaust part 60 is provided, a rectangular cylindrical exhaust comprising an inner surface of the case upper surface part and a bottom surface part and a guide wall 65 provided inside the case front and rear surface part. A part guide part is formed, and a case sliding part 62a provided with a roller ball that rolls on a peripheral surface of the exhaust part guide part is provided on an outer periphery of an end part inside the case of the exhaust cylinder 61, The exhaust part 60 is guided by a case sliding part 62 a of the exhaust cylinder 61 by the exhaust part guide part in the projector case 1 and protrudes out of the projector case 1 by a predetermined stroke.

  Further, exhaust part moving knobs 63 that are exposed to the outside of the projector case 1 from slit parts 66 formed on the front and rear faces of the projector case 1 are provided on the front and rear faces of the case inner end of the exhaust cylinder 61, respectively. The exhaust portion 60 is projected out of the projector case 1 by sliding the exhaust portion moving knob 63 in the case side direction, and the side surface of the projector case 1 by sliding the exhaust portion moving knob 63 in the reverse direction. It is moved back to the opening 64.

  The exhaust part moving knob 63 is a case where the opening part of the slit part 66 (the part opposite to the direction in which the exhaust part moving knob 63 is moved) when the knob 63 is slid in the side surface direction of the case. 1 has a slit cover 63a that covers from the inside to prevent the air in the case from flowing out from the slit portion 66.

  The exhaust unit 60 is a forced exhaust unit, and the projector case 1 includes a plurality of exhaust units 60 corresponding to substantially the entire region of the exhaust unit 60, that is, the entire region of the side surface of the projector case 1 on the side where the light source 17 is disposed. For example, three large wind exhaust fans 67, 68 and 69 are arranged.

  And, the intake fans 58, 59 disposed in the projector case 1 so as to face the forced intake portions 55, 57, respectively, and the exhaust fans 67, 68, 69 disposed in correspondence with the exhaust portion 60, The power supply system circuit board 52 is connected.

  Further, the projector of this embodiment detects the protrusion of the exhaust part 60 to the outside of the projector case 1 when the power is turned on, starts the lighting of the light source 17 and the driving of the exhaust fans 67, 68, 69, and the exhaust part 60 When the projection of the exhaust section 60 is not detected, the projector user is instructed to project the exhaust section 60 without starting the lighting of the light source 17 and the driving of the intake fans 58, 59 and the exhaust fans 67, 68, 69. It has security means to do.

  This security means is provided in a projector (for example, a micro switch) 70 provided in the projector case 1 for detecting the protrusion of the exhaust part 60 to the outside of the projector case 1, and the power key 2 is When turned on, the detection of the protrusion of the exhaust part 60 by the detector 70 is confirmed, and when the protrusion of the exhaust part 60 is detected, a light source lighting signal and a fan drive signal are output, and the exhaust part When the protrusion of 60 is not detected, the light source lighting signal and the fan drive signal are not output, and a safety circuit (not shown) that outputs an exhaust part protrusion instruction signal for causing the exhaust part 60 to protrude is formed. The safety circuit is formed on the projector control circuit board 54, and the detector 70 is connected to the safety circuit.

  In this embodiment, when the protrusion of the exhaust part 60 is not detected, the security means is connected to the display panel drive circuit (not shown) and the display / audio system circuit provided in the use state display part 7 from the safety circuit. An exhaust part ejecting instruction signal is supplied to each of the substrates 51, and an instruction to eject the exhaust part 60 to the user is displayed on the use state display part 7 and a sound or alarm from the speaker sound emitting part 9 I'm trying to do both.

  Further, in this embodiment, when the light source 17 is not turned on and the protrusion of the exhaust part 60 is not detected while the intake and exhaust fans 58, 59, 67, 68, 69 are driven, While the lighting and intake / exhaust fans 58, 59, 67, 68, 69 are continuously driven, the user is instructed to project the exhaust part 60.

  This projector is used in a state where the projection lens cover 12 is opened to expose the emission end of the projection lens 45 and the exhaust part 60 is projected out of the projector case 1. In this state, the power key 2 Is turned on, the light source lamp 18 of the light source 17 is turned on, the color wheel 30 of the light source side optical system 29 is rotationally driven at high speed, and red, green and blue lights are sequentially projected onto the micromirror display element 28, The red, green, and blue light sequentially emitted from the micromirror display element 28 is projected by the projection lens 45, and the intake fans 59 and 60 and the exhaust fans 67, 68, and 69 are driven. Air cooling is started.

  Further, the posture adjustment of the projector case 1 that matches the projection direction of the projection lens 45 with the projection surface is performed by adjusting the protrusion height of the forefoot member 14 in a state where the red, green, and blue light is projected by the projection lens 45. Is done.

  In this projector, light emitted from the light source 17 and incident on the light source side optical system 29 is sequentially colored into three colors of red, green, and blue by the color wheel 30, and further the intensity distribution by the light guide rod 33. And is projected toward the micromirror display element 28 by the light source side lenses 34 and 35 and the mirror 37, and is synchronized with the projection period of the red, green and blue light on the micromirror display element 28. By sequentially writing red, green, and blue monochromatic image data, the micromirror display element 28 sequentially displays red, green, and blue monochromatic images, and the red, green, and blue that are sequentially emitted from the micromirror display element 28, The blue monochromatic image light is magnified by the projection lens 45 and projected onto the projection plane. The full-color monochromatic image of red, green, and blue appears to overlap the projection plane. To display a color image.

  When no image signal or video signal is input from the personal computer, red, green, and blue light are sequentially emitted from the entire display area of the micromirror display element 28, and the light is projected by the projection lens 45. Therefore, the projection area of the projection surface at this time is white throughout.

  When the image signal or the video signal is input, red, green, and blue single-color image data are sequentially written in the micromirror display element 28, and three colors of red, green, and blue are displayed on the projection surface. Images are sequentially projected to display a full color image.

  In this projector, the light source 17 reflects the emitted light from the light emitting point of the light source lamp 18 in the condensing direction by the reflector 21 and emits the light from the open surface, and the light is emitted to the front side of the open surface of the reflector 21. It passes through the arranged explosion-proof glass 22 and is emitted.

  Light emitted from the light source 17 is sequentially colored into three colors of red, green, and blue by the color wheel 30 of the light source side optical system 29 and enters the light guide rod 33.

The light emitted from the light source 17, that is, the light emitted from the open surface of the reflector 21 and refracted and transmitted through the explosion-proof glass 22 disposed obliquely is transmitted with its optical axis O ₂ as described above. Is the light shifted in one direction with respect to the optical axis O ₁ of the light emitted from the open surface of the reflector 21. In this projector, the light guide rod 33 is moved from the light source 17 to the rod central axis. Since the light is transmitted through the explosion-proof glass 22 and aligned with the optical axis O ₂ of the emitted light, the emitted light from the light source 17 can be incident on the light guide rod 33 from its incident surface.

  The light incident on the light guide rod 33 from the incident surface is made uniform in intensity distribution by the light guide rod 33 and emitted from the output surface, and the light source side lenses 34 and 35 and the mirror 37 cause the micromirror display element. 28 is projected from a direction inclined in one direction with respect to the front direction, and is corrected to parallel light along a direction inclined by a predetermined angle with respect to the front direction of the micromirror display element 28 by the relay lens 44. Then, the light enters the micromirror display element 28.

  The micromirror display element 28 sequentially writes red, green, and blue monochromatic image data in synchronization with the red, green, and blue light projection periods, and sequentially displays red, green, and blue monochromatic images. .

  Then, the red, green, and blue monochromatic image lights sequentially emitted from the micromirror display element 28 are collected by the relay lens 44 and incident on the projection lens 45, and are magnified by the projection lens 45 to be projected onto the projection surface. Projected.

  In this projector, a meniscus lens in which the surface facing the micromirror display element 28 is formed as a convex surface and the surface facing the light source side optical system 29 and the projection lens 45 is formed as a concave surface is formed on the relay lens 44. Therefore, the projection light from the light source side optical system 29 is corrected to parallel light along a direction inclined at a predetermined angle with respect to the front direction of the micromirror display element 28 and is incident on the micromirror display element 28. The image light emitted from the micromirror display element 28 is incident on the projection lens 45 and, of the projection light from the light source side optical system 29, the light source side optical system 29 and the projection lens 45 of the relay lens 44. The light reflected from the opposite concave surface can be emitted in a direction other than the projection direction of the image light by the projection lens 45. Thus, the light reflected by the concave surface facing the light source side optical system 29 and the projection lens 45 of the relay lens 44 is not projected onto the projection plane by the projection lens 45, and therefore the luminance is reflected on the projection plane. It is possible to display a high-quality projected image without unevenness or contrast reduction.

  Further, the air cooling in the projector case 1 is performed by using the large wind exhaust fans 67, 68, and the air in the case from the exhaust portion 60 provided substantially over the side surface of the projector case 1 on the side where the light source 17 is disposed. 69 is forcibly exhausted from an intake portion 55 provided in a lower portion of the light source side housing 38 on the bottom surface of the case, and an intake portion 57 provided in correspondence with the arrangement portion of the micromirror display element 28 on the rear surface of the case. Outside air is forcibly sucked into the case 1 by the intake fans 58 and 59, and an unillustrated intake portion provided in a lower part of the power supply circuit board 52 on the bottom surface of the case and a projection lens 45 of the projector case 1 are arranged. The outside air is supplied to the case by the natural intake accompanying the exhaust of the air in the case from the exhaust part 60 from the intake part 56 provided on the side surface of the exhausted side. Then, the cooling air sucked from each of the intake portions 55, 56, and 57 is ventilated through the projector case 1 as shown by broken arrows in FIG. A part of the light source 17 flows into the reflector 21 from the ventilation hole 26 provided on one side of the explosion-proof cover 25 of the light source 17, and the air in the reflector 21 is provided on the other side of the explosion-proof cover 25. Then, it is discharged into the case and air-cooled the internal space of the reflector 21 and the light source lamp 18.

  Further, after the image projection is completed, the input of the image signal or video signal is stopped, and then the power key 2 is turned off. When the power key 2 is turned off, the light source lamp 18 of the light source 17 is turned off. The rotation driving of the color wheel 30 is stopped, and the driving of the intake fans 59, 60 and the exhaust fans 67, 68, 69 is stopped after a certain period of time or when the temperature of the light source falls below a certain temperature. .

  The projection lens cover 12 is closed as shown in FIG. 2 after driving of the intake fans 59, 60 and exhaust fans 67, 68, 69 is stopped. After the driving of 60 and the exhaust fans 67, 68, 69 are stopped, they are returned to and stored in the opening 64 on the side surface of the projector case 1 as shown in FIG.

  When the input of the image signal or the video signal is stopped and the image projection is finished, the entire projection area of the projection surface becomes white as described above. Therefore, the projection lens cover 12 is not turned off without turning off the power key 2. In this case, the lighting of the light source lamp 18 and the driving of the color wheel 30, the intake fans 59 and 60, and the exhaust fans 67, 68, and 69 are continued, and power is wasted.

  However, in this projector, since the opening is formed in the central portion of the projection lens cover 12 and the translucent plate 13 is provided in the opening, the projection lens cover 12 is closed without turning off the power key 2. In some cases, the translucent plate 13 appears to shine upon receiving light emitted from the projection lens 45. Therefore, the user can be made aware that he has forgotten to turn off the power.

  Further, since this projector is provided with the exhaust part 60 of the projector case 1 in the opening 64 formed in the projector case 1 so as to protrude outside the projector case 1, the exhaust part 60 is illustrated in FIG. 1 and FIGS. 3 and 4, the exhaust fans 67, 68, 69 are disposed in the projector case 1 so as to face the exhaust part 60 and in the vicinity thereof by projecting out of the projector case 1 as indicated by solid lines. The distance from the exhaust unit 60 to the exhaust unit 60 is increased, and the exhaust flow by the exhaust fans 67, 68, 69 becomes an air flow in which the wind pressure is averaged over substantially the entire cross section, and is substantially uniform over the entire exhaust unit 60. It can be made to hit with various wind pressures.

  Therefore, according to this projector, it is possible to prevent the exhaust portion 60 from being partially exposed to an exhaust flow having a strong wind pressure and generating a vortex in the exhaust flow from the exhaust hole 62a of the portion. , 68 and 69 can be effectively air-cooled with an exhaust efficiency corresponding to the air blowing power, and wind noise in the exhaust section 60 can be reduced.

  In addition, when the projector is not in use, the exhaust unit 60 is stored in the opening 64 of the projector case 1 as shown by the chain line in FIGS. Or you can carry it around.

  In the projector, as described above, the exhaust part 60 has a length larger than the projecting stroke to the outside of the projector case 1 and is fitted in the opening 64 of the projector case 1 so as to be movable in the case inside and outside. It is preferable that the exhaust pipe 61 is provided, and a plurality of exhaust holes 62a are formed, and the exhaust panel 61 is provided at an opening end outside the case of the exhaust pipe 61. The air heated in the projector case 1 can be exhausted from the exhaust part 60 without flowing out in the peripheral direction of the exhaust part 60.

  Further, the projector detects the protrusion of the exhaust part 60 outside the projector case 1 when the power is turned on by the detector 70 to turn on the light source 17 and drive the intake / exhaust fans 58, 59, 67, 68, 69. When the exhaust unit 60 is not detected and the projection of the exhaust unit 60 is not detected, the light source 17 is not turned on and the driving of the intake / exhaust fans 58, 59, 67, 68, 69 is not started. Is provided with a safety means for instructing the projection of the exhaust fan 60, so that generation of a loud wind noise caused by driving the exhaust fans 67, 68, 69 in a state where the exhaust section 60 cannot be projected is prevented. Abnormal temperature rise in the projector case 1 due to lighting of the light source 17 without driving the 68 and 69 can be prevented.

  Further, in the above embodiment, when the light source 17 is turned on and the exhaust fan 67, 68, 69 is not detected while the exhaust unit 60 is not detected, the security means turns on the light source 17 and supplies / exhausts the light source 17. Since the configuration is such that the user is instructed to project the exhaust unit 60 while the fans 58, 59, 67, 68, and 69 are continuously driven, the exhaust unit 60 is mistakenly projected during image projection, for example. Is moved inwardly in the projector case 1, the exhaust part 60 can be quickly returned to the protruding position again without stopping image projection.

  In the above embodiment, when the safety means does not detect the protrusion of the exhaust part 60 outside the projector case 1 when the power is turned on, both the intake fans 58 and 59 and the exhaust fans 67, 68 and 69 are driven. However, the intake fans 58 and 59 may be driven when the power is turned on regardless of the detection of the protrusion of the exhaust part 60.

  In the projector of the above embodiment, the micromirror display element 20 is disposed on one side in the projector case 1 and the light source 17 is disposed on the other side in the projector case 1. Since the exhaust part 60 is provided on the side surface of the projector case 1 on the side where the light source 17 is disposed, and the intake parts 55, 56, 57 are provided on the other surface of the projector case 1, It is possible to quickly exhaust the high-temperature air near the light source 17 and take outside air from a region avoiding the vicinity of the light source 17 to cool the projector case 1 more effectively.

  Furthermore, in the projector according to the above embodiment, the exhaust unit 60 is provided in substantially the entire side surface of the projector case 1 on the side where the light source 17 is disposed, and in the projector case 1 in the approximately entire region of the exhaust unit 60. Correspondingly, a plurality of exhaust fans 67, 68, 69 are arranged, so that the amount of exhaust can be increased and the inside of the projector case 1 can be cooled more effectively.

  Moreover, in the said Example, the said intake parts 55,56,57 are made into the some surfaces other than the side surface in which the said exhaust part 60 of the said projector case 1 was provided, for example, the bottom face of the projector case 1, and the projection lens 45. Is provided on each of the side surface and the rear surface on which the is disposed, the outside air can be taken in from the plurality of surfaces and the projector case 1 can be effectively air-cooled.

  Furthermore, in the above-described embodiment, the air intake 56 is provided on the surface of the projector case 1 opposite to the side on which the exhaust 60 is provided, that is, on the side on which the projection lens 45 is disposed. The substantially whole area in the projector case 1 can be air-cooled.

  In the above embodiment, the light source side housing 38 on the bottom surface of the case among the plurality of air intake portions 55, 56, 57 provided on a plurality of surfaces other than the side surface on which the exhaust portion 60 of the projector case 1 is provided. An air intake portion 55 provided in the lower portion and an air intake portion 57 provided in a portion corresponding to the arrangement portion of the micromirror display element 28 on the rear surface of the case serve as a forced air intake hole, Since the intake fans 58 and 59 are arranged to face the intake portions 55 and 57, respectively, the air cooling effect in the projector case 1 can be further enhanced.

  Furthermore, in the projector according to the above-described embodiment, the cross-sectional shape of the portion between the adjacent exhaust holes 62a of the exhaust panel 62 that constitutes the exhaust unit 60 is changed to a horizontally long rhombus shape, so that the peripheral surfaces of the plurality of exhaust holes 62a. Is formed in a chevron shape that is inclined in the direction in which the hole width increases from the center in the depth direction toward the inner and outer surfaces of the exhaust panel 62, and the peripheral surface of the exhaust hole 62a and both side edges thereof and the exhaust panel Since the boundary between the inner surface and the outer surface of 62 is formed into a shape having no surface perpendicular to or close to the exhaust flow direction, it is more effective that vortices are generated in the exhaust flow from the exhaust holes 62. This can prevent the projector case 1 from being air-cooled more effectively and can further reduce wind noise in the exhaust section 62.

  That is, FIG. 6 shows an exhaust hole 62b of a comparative example in which the peripheral surface is formed on a straight surface perpendicular to the plate surface of the exhaust panel 62, and the exhaust hole 62b of the comparative example has both side edges of the peripheral surface. Since the boundary between the inner surface and the outer surface of the exhaust panel 62 is a right angle, a vortex is generated in the exhaust flow from the exhaust hole 62b as shown by the arrow in the figure, and the blowing force of the exhaust fans 67, 68, 69 is generated. In addition to not being able to obtain exhaust efficiency commensurate with, wind noise is generated.

  On the other hand, the exhaust hole 62a having a peripheral surface formed in the shape of a chevron as in the above embodiment is a surface perpendicular to or close to the boundary between the peripheral surface and both side edges thereof and the inner surface and outer surface of the exhaust panel 62. Since the exhaust flow from the exhaust hole 62a is exhausted with almost no vortex as shown by the arrow in FIG. 5, it is almost completely possible that the vortex is generated in the exhaust flow from the exhaust hole 62a. Can be prevented.

  Therefore, according to the projector of the above embodiment, the effect of preventing the vortex generation of the exhaust flow by projecting the exhaust part 60 out of the projector case 1, the peripheral surface of the exhaust hole 62 a and its both side edges, and the exhaust panel 62 The inside of the projector case 1 is more effectively air-cooled by both the effect of preventing the vortex generation of the exhaust flow by making the boundary between the inner surface and the outer surface perpendicular to the exhaust flow direction or having no surface at an angle close thereto. In addition, wind noise in the exhaust part 62 can be further reduced.

  In the above embodiment, the peripheral surfaces of the plurality of exhaust holes 62a of the exhaust panel 62 are formed in a chevron shape, but the peripheral surfaces of the exhaust holes 62a are not limited to the chevron shape, A shape that curves or inclines in a direction in which the hole width increases from the center in the depth direction toward the inner surface and outer surface of the exhaust panel 62, that is, the peripheral surface of the exhaust hole 62a and both side edges thereof and the inner surface and outer surface of the exhaust panel 62. The boundary portion may be a shape that can be formed into a shape having no surface perpendicular to or close to the exhaust flow direction.

  FIG. 7 is a cross-sectional view of an exhaust hole 62a showing a second embodiment of the present invention. In this embodiment, the cross-sectional shape of a portion between adjacent exhaust holes 62a of the exhaust panel 62 is defined as the thickness of the exhaust panel 62. A direction in which the hole width of the peripheral surface of the plurality of exhaust holes 62a increases from the center in the depth direction toward the inner surface and the outer surface of the exhaust panel 62 by forming a horizontally long elliptical shape having a long axis in the vertical direction. And the boundary between the peripheral surface of the exhaust hole 62a and both side edges thereof and the inner surface and outer surface of the exhaust panel 62 has no surface perpendicular or close to the exhaust flow direction. Moreover, the exhaust panel 62 is formed in a shape that is continuous in a streamline shape from the inner surface side to the outer surface side.

  FIG. 8 is a cross-sectional view of an exhaust hole 62a showing a third embodiment of the present invention. In this embodiment, the cross-sectional shape of the portion between the adjacent exhaust holes 62a of the exhaust panel 62 is shown in FIG. A portion on the outer surface side from the vicinity of the central portion in the thickness direction has a wedge shape in which the thickness decreases toward the outer surface, and a portion on the inner surface side from the vicinity of the central portion has a semicircular shape continuous with the wedge-shaped portion. Thus, the peripheral surface of the plurality of exhaust holes 62a is formed in an arc shape in which the inner surface side of the exhaust panel 62 bulges outward, and the hole width increases from the arc-shaped portion toward the outer surface direction of the exhaust panel 62. And the boundary between the peripheral surface of the exhaust hole 62a and both side edges thereof and the inner surface and outer surface of the exhaust panel 62 has no surface perpendicular to or close to the exhaust flow direction. And the inner surface of the exhaust panel 62 It is obtained by a shape in a shape continuous with the streamlined planar over the outer surface side from.

  FIG. 9 is a cross-sectional view of an exhaust hole 62a showing a fourth embodiment of the present invention. This embodiment shows the length of the exhaust hole 62a in the peripheral surface of the exhaust hole 62a formed of a long hole. Each of the two surfaces along the direction is one direction orthogonal to the length direction of the exhaust hole 62a with the blade surface shape of the third embodiment shown in FIG. And the boundary between the peripheral surface of the exhaust hole 62a and both side edges thereof and the inner surface and outer surface of the exhaust panel 62 is perpendicular or close to the exhaust flow direction. In addition, the exhaust panel 62 is formed in a continuous shape from the inner surface side to the outer surface side of the exhaust panel 62, and two peripheral surfaces along the length direction of the exhaust hole 62a are formed on the exhaust hole 62a. One perpendicular to the length direction of It is obtained by inclined in the direction.

  In any of the second to fourth embodiments, the peripheral surface of the plurality of exhaust holes 62a and the boundary portions between the both side edges thereof and the inner surface and outer surface of the exhaust panel 62 are perpendicular to or close to the exhaust flow direction. Further, the exhaust panel 62 is continuous in a streamline shape from the inner surface side to the outer surface side, and is inclined in one direction orthogonal to the length direction of the exhaust hole 62a. Therefore, it is possible to substantially completely prevent the vortex from being generated in the exhaust flow from the exhaust hole 62a, to further effectively cool the inside of the projector case 1, and to almost eliminate the wind noise in the exhaust unit 60. .

  Further, in the fourth embodiment, two circumferential surfaces along the length direction of the exhaust hole 62a are inclined in one direction perpendicular to the length direction of the exhaust hole 62a. The exhaust from the plurality of exhaust holes 61 can be discharged in one direction orthogonal to the length direction of the long holes.

  When the exhaust hole 62a of the fourth embodiment is adopted, the exhaust panel 62 is attached to and detached from the opening end outside the case of the exhaust cylinder 61 that is movably fitted in the opening 64 of the projector case 1. It is desirable that the exhaust holes 62a can be mounted so that both side edges in the direction orthogonal to the length direction of the exhaust holes 62a are opposite to each other. By doing so, the direction of the exhaust gas discharged from the exhaust holes 62a Can be arbitrarily selected in one direction perpendicular to the length direction of the exhaust hole 62a and the other direction.

  In the projector of the above embodiment, the color wheel 30 is disposed on the incident side of the light guide rod 33 of the light source side optical system 29. However, the color wheel 30 extends from the light source 17 to the incident end of the projection lens 45. If it is in the optical path up to, it may be arranged at another position.

  Further, the projector of the above embodiment uses the micromirror display element 28 as a display element. However, if the display element displays an image by controlling the emission of incident light, for example, on the rear side. It may be a reflective liquid crystal display element provided with a reflective film, or a transmissive liquid crystal display element that controls and displays the emission of light incident from the rear side to the front side. When a reflective liquid crystal display element is used, Light that is incident from one incident direction inclined with respect to the front direction, passes through the liquid crystal layer, and is reflected by the reflective film is refracted by a prism sheet or the like and is emitted in the front direction. When a liquid crystal display element is used, the arrangement position of the light source 17 and the configuration of the light source side optical system 29 may be changed so that light is projected from the rear surface to the transmissive liquid crystal display element.

  Further, when a liquid crystal display element is used as the display element, the liquid crystal display element may be a color display element having a plurality of colors corresponding to a plurality of pixels, for example, red, green, and blue color filters, When this color display element is used, the color wheel 30 may be omitted from the light source side optical system 29 and white light may be projected onto the color display element.

FIG. 2 is an external perspective view of the projector in use according to the first embodiment of the present invention. FIG. 3 is an external perspective view of the projector when not in use. The cross-sectional top view of the said projector. Sectional drawing which follows the IV-IV line | wire of FIG. The expanded sectional view of the exhaust hole of the exhaust part of the said projector. Sectional drawing of the exhaust hole of the comparative example which formed the surrounding surface in the linear surface perpendicular | vertical to the plate | board surface of an exhaust panel. Sectional drawing of the exhaust hole which shows 2nd Example of this invention. Sectional drawing of the exhaust hole which shows the 3rd Example of this invention. Sectional drawing of the exhaust hole which shows the 4th Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector case, 17 ... Light source, 28 ... Micromirror display element, 29 ... Light source side optical system, 30 ... Color wheel, 33 ... Light guide rod, 34, 35 ... Light source side lens, 37 ... Mirror, 43 ... Cover glass 44 ... Relay lens, 45 ... Projection lens, 55, 56, 57 ... Intake section, 55a, 56a, 57a ... Intake section hole, 58, 59 ... Intake fan, 60 ... Exhaust section 61 ... Exhaust tube, 62 ... Exhaust panel 62a ... exhaust hole, 64 ... opening, 67, 68, 69 ... exhaust fan, 70 ... exhaust part protrusion detector.

Claims (9)

  In a projector case having an air intake section and an exhaust section in which a plurality of exhaust holes are arranged, a light source, a display element for controlling the emission of incident light and displaying an image, and the light emitted from the light source on the display element An incident optical system; a projection lens for projecting light emitted from the display element to the outside of the projector case; and an exhaust fan disposed in the vicinity of the exhaust unit so as to face the exhaust unit; and the exhaust unit The projector is characterized in that it is provided in an opening formed in the projector case so as to protrude outside the projector case.   The exhaust part has a length longer than the projecting stroke to the outside of the projector case, and an exhaust cylinder fitted into the opening of the projector case so as to be movable inward and outward of the case and a plurality of exhaust holes are formed. The projector according to claim 1, comprising an exhaust panel provided at an opening end outside the case of the exhaust cylinder.   When the power is turned on, the projection of the exhaust part to the outside of the projector case is detected and the lighting of the light source and the driving of the exhaust fan are started. When the projection of the exhaust part is not detected, the lighting of the light source and the driving of the exhaust fan are started. 2. The projector according to claim 1, further comprising a security unit that instructs the user to project the exhaust unit.   The safety means instructs the user to project the exhaust part while continuing to turn on the light source and drive the exhaust fan when the exhaust part is not detected while the light source is turned on and the exhaust fan is driven. The projector according to claim 3.   The display element is disposed on one side portion in the projector case, the light source is disposed on the other side portion in the projector case, and the exhaust portion is disposed on a side surface of the projector case on the side where the light source is disposed. The projector according to claim 1, wherein the air intake portion is provided on another surface of the projector case.   The peripheral surface of the plurality of exhaust holes formed on the exhaust panel and the boundary between both side edges thereof and the inner surface and the outer surface of the exhaust panel are formed in a shape having no surface perpendicular to or near the angle to the exhaust flow direction. The projector according to claim 1.   The peripheral surface of the exhaust hole is formed in a shape that is curved or inclined in a direction in which the hole width increases from the center in the depth direction toward the inner surface and the outer surface of the exhaust panel. Projector.   The exhaust holes are long holes, and two of the peripheral surfaces along the length direction of the exhaust holes are the lengths of the exhaust holes from the inner surface side to the outer surface side of the exhaust panel. The projector according to claim 6, wherein the projector is formed in a shape inclined in one direction orthogonal to the direction.   The exhaust panel is detachably attached to the opening end of the exhaust case that is movably fitted in the opening of the projector case, and both side edges in the direction perpendicular to the length direction of the exhaust hole are reversed. The projector according to claim 8, wherein the projector is detachable.

Images