JP2014167502A - Image projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image projection device in which air heated by a light source can be favorably cooled and exhausted.SOLUTION: An image projection device includes: a light source 61; image projection means such as an optical engine unit 100 that projects an image by using light from the light source 61; and mixing means that intakes and mixes air heated by the light source 61 and air with lower temperature than that air, and exhausts the air mixed by the mixing means to the outside. The mixing means includes a mixing portion that intakes and mixes the air heated by the light source 61 and the air with lower temperature than that air; and an agitation member such as a cylindrical fan that agitates the air inside the mixing portion.

Description

  The present invention relates to an image projection apparatus.

  2. Description of the Related Art Conventionally, an image forming unit including a light modulation element that modulates light based on image data from a personal computer or the like and an irradiation unit that emits light from a light source to the light modulation element is provided. 2. Description of the Related Art An image projection apparatus that forms an image formed on a projection surface using a projection optical unit is known.

  As the light source of the image projection apparatus, a halogen lamp, a metal halide lamp, a high-pressure mercury lamp, or the like is used, and these lamps are heated to high temperatures. Therefore, air is blown to the light source by a blowing means such as a blower or a fan to cool the light source. Air whose temperature has risen due to heat removal from the light source (hereinafter, air after cooling the light source) is discharged from the exhaust port to the outside of the apparatus. There was a problem in that the air after cooling the light source exhausted from the exhaust port was hot.

  Patent Document 1 discloses a mixing unit that mixes air after cooling from a light source that has been heated to remove heat from the light source and outside air that is cooler than the air after cooling from the light source that has been taken into the apparatus by a cooling fan (hereinafter referred to as cooling air). An image projection apparatus is described in which the air is poured into a mixing duct and the air and cooling air are mixed after cooling the light source, the temperature is lowered, and then the air is exhausted outside the apparatus.

  However, in the image projection apparatus described in Patent Document 1, the cooling air and the air after cooling the light source are caused to flow into the mixing duct from the same direction. Then, the cooling air and the air after cooling the light source are passively mixed with the flow of the cooling air in the mixing duct and the air after cooling the light source. For this reason, if the flow velocity in the mixing duct of cooling air and the flow velocity in the mixing duct of air after cooling the light source are different, a layer of cooling air and a layer of air after cooling the light source are formed in the mixing duct. There was a risk of it. As a result, air could not be sufficiently mixed in the mixing duct, and high-temperature air might be exhausted from the exhaust port.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an image projection apparatus that can cool and exhaust air heated by a light source.

  In order to achieve the above object, the invention of claim 1 is directed to a light source, image projection means for projecting an image using light from the light source, air heated by the light source, and air having a temperature lower than the air. An image projection apparatus for exhausting the air mixed by the mixing means to the outside of the apparatus, wherein the mixing means includes air heated by the light source and air having a temperature lower than the air And a mixing member that mixes and mixes the air in the mixing unit.

  According to the present invention, the air heated by the light source in the mixing unit and the air having a temperature lower than that of the air are agitated by the stirring member, so that the air heated by the light source in the mixing unit and the low-temperature air are Mix well. As a result, the air heated by the light source in the mixing section can be cooled well and exhausted outside the apparatus.

The perspective view which shows the projector and projection surface which concern on this embodiment. FIG. 2A is a perspective view of the inside of the projector as viewed from the front side of FIG. FIG. 2B is a perspective view of the inside of the projector viewed from the back side of FIG. An optical path diagram from the projector to the projection surface. FIG. 2 is a schematic perspective view showing an internal configuration of a projector. The schematic perspective view of a light source part. The perspective view which shows the optical system components accommodated in the illumination part with other parts. The perspective view which looked at the illumination part, the projection lens part, and the image formation part from the A direction of FIG. The figure explaining the optical path of the light in an illumination part. The perspective view of an image formation part. The perspective view which shows a 1st optical part with an illumination part and an image formation part. AA sectional drawing of FIG. The perspective view which shows the 2nd optical system which a 2nd optical part hold | maintains with a projection lens part, an illumination part, and an image formation part. The perspective view which shows a 2nd optical part with a 1st optical part, an illumination part, and an image formation part. The perspective view which shows the optical path from a 1st optical system to a projection surface. The schematic diagram which showed the arrangement | positioning relationship of each part in an apparatus. The perspective view which shows the internal structure of a projector. Explanatory drawing explaining the flow of the air in a projector. The figure which shows the arrangement | positioning relationship of the axial flow fan for intake, a light source housing, and a sirocco fan. The perspective view which shows the flow of the air inhaled by the axial flow fan for intake. The perspective view of the projector which shows the arrangement | positioning relationship of a power supply part. The perspective view which shows the flow of the air which cools a light source part. Perspective view with the intake axial fan removed The figure seen from the D direction of FIG. The perspective view which shows the flow of the air from a sirocco fan to an intake / exhaust port. The principal part perspective view which shows the projector of a modification. The figure which shows the flow of the air in the projector of a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the overall configuration of the image projection apparatus according to the present invention will be described.
FIG. 1 is an external perspective view showing a projector 1 as an image projection apparatus and a projection surface 101 such as a screen according to an embodiment of the present invention. In the following description, as shown in FIG. 1, the normal direction of the projection plane 101 is the X direction, the short axis direction (vertical direction) of the projection plane is the Y direction, and the long axis direction (horizontal direction) of the projection plane 101 is. Let it be the Z direction.

  The projector is a device that forms a projection image based on image data input from a personal computer, a video camera, or the like, and projects and displays the projection image P on a projection surface 101 such as a screen. In particular, liquid crystal projectors have recently been improved in terms of high resolution and low price due to high resolution of liquid crystal panels, high efficiency of light sources (lamps), and the like. In addition, a small and light projector 1 using a micro drive mirror device DMD (Digital Micro-mirror Device: registered trademark) has become widespread, and the projector 1 has been widely used not only in offices and schools but also at home. It is coming. Front-type projectors have improved portability and are now being used for small meetings of several people. Such a projector is required to be able to project an image on a large screen (enlarge the projection screen) and to make the “projection space required outside the projector” as small as possible. As will be described later, in the projector 1 according to the present embodiment, a transmission optical system such as a projection lens is set in parallel with the projection surface 101, and the light beam is folded by a folding mirror, and then the light beam is projected to the projection surface 101 by a free-form curved mirror. And is configured to enlarge and project. With this configuration, it is possible to reduce the size of the optical engine unit in a vertical three-dimensional manner.

  On the upper surface of the projector 1, a transmissive glass 51 from which the light flux of the projection image P is emitted is provided, and the light flux that has passed through the transmissive glass 51 is projected onto the projection surface 101. An operation unit 83 for the user to operate the projector 1 is provided on the upper surface of the projector 1. A focus lever 33 for adjusting the focus is provided on the side surface of the projector 1.

FIG. 2 is an internal perspective view of the inside of the projector 1 with the main body cover removed. 2A is a perspective view of the inside of the projector 1 viewed from the front side of FIG. 1, and FIG. 2B is a perspective view of the inside of the projector 1 viewed from the back side of FIG. FIG. 3 is an optical path diagram from the projector 1 to the projection plane 101.
The projector 1 includes an optical engine unit 100 and a light source unit 60 having a light source that emits white light. The optical engine unit 100 includes an image forming unit A as an image forming unit that forms an image using light from a light source, and a projection optical unit for projecting a light beam of an image formed by the image forming unit A onto a projection surface 101. B.

  The image forming unit A folds the light from the light source and irradiates the DMD 12 with the light modulation unit 10 having the DMD 12 that is a micro-drive mirror device having a large number of micro mirrors that can be driven so as to change the inclination of the reflection surface. The illumination unit 20 is used. The projection optical unit 102 includes a first projection optical system 30 including a coaxial first optical system 70 including at least one transmissive refractive optical system and having positive power, and a folding mirror 41 and positive power. The second projection optical system 40 includes a curved mirror 42 having the curved mirror 42.

  The DMD 12 emits light from the light source by the illumination unit 20 and modulates the light emitted by the illumination unit 20 to generate an image. The optical image generated by the DMD 12 is projected onto the projection surface 101 via the optical system 70 of the first projection optical system 30, the folding mirror 41 and the curved mirror 42 of the second projection optical system 40.

FIG. 5 is a perspective view of the light source unit 60.
The light source unit 60 includes a light source bracket 62 that is a holding member that holds the light source 61, and a light source 61 such as a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is mounted on the light source bracket 62. Further, the light source bracket 62 is provided with a connector portion 62a for connecting to a power supply side connector (not shown) connected to the power supply portion 80 (see FIG. 15).

  A holder 64 holding a reflector 67 and the like is screwed to the light emitting side of the light source 61 above the light source bracket 62. An exit window 63 is provided on the surface of the holder 64 opposite to the light source 61 arrangement side. The light emitted from the light source 61 is condensed on the emission window by the reflector 67 held by the holder and is emitted from the emission window 63.

  In addition, light source positioning portions 64a1 to 64a3 are provided on the upper surface of the holder 64 and on both ends in the X direction of the lower surface of the holder in order to position the light source portion 60 on the illumination bracket 26 (see FIGS. 6 and 7) of the illumination portion 20. Yes. The light source positioning portion 64a3 provided on the upper surface of the holder 64 has a protruding shape, and the two light source positioning portions 64a1 and 64a2 provided on the lower surface of the holder 64 have a hole shape.

  In addition, a light source inlet 64 c serving as an intake port through which air for cooling the light source 61 flows is provided on the upper surface of the holder 64. Further, a light source exhaust port 64 b through which air heated by the heat of the light source 61 is exhausted is provided on the side surface except the upper surface of the holder 64.

FIG. 6 is a perspective view of the illumination unit 20 showing the optical system components housed in the illumination unit 20 together with other components.
As shown in FIG. 6, the illumination unit 20 includes a color wheel 21, a light tunnel 22, two relay lenses 23, a cylinder mirror 24, and a concave mirror 25, which are held by an illumination bracket 26. Yes. The illumination bracket 26 has a housing-like portion 261 in which the two relay lenses 23, the cylinder mirror 24, and the concave mirror 25 are accommodated. Of the four side portions of the housing-like portion 261, Only the right side in the figure has a side surface, and the other three surfaces are open. An OFF light plate 27 (see FIG. 7) is attached to the side opening on the far side in the X direction in the figure, and the side opening on the near side in the X direction in the figure is shown in any drawing. An uncovered cover member is attached. Thus, the two relay lenses 23, the cylinder mirror 24, and the concave mirror 25 housed in the housing-like portion 261 of the illumination bracket 26 are illustrated in the illumination bracket 26, the OFF light plate 27, and any drawing. The cover member is not covered.

  Further, an irradiation through-hole 26d for exposing the DMD 12 is provided on the lower surface of the housing-like portion 261 of the illumination bracket 26.

  The lighting bracket 26 has three leg portions 29. These leg portions 29 are in contact with a base member 53 (see FIG. 14) as an installation surface of the projector 1 and are weighted to the first projection optical system 30 and the second projection optical system 40 that are stacked and fixed on the illumination bracket 26. Support. Further, by providing the leg portion 29, a space for air to flow in is formed in the heat sink 13 (see FIG. 7) as a cooling means for cooling the DMD 12 as the image generating means of the light modulation section 10.

  6 are the leg portions of the lens holder 32 of the first projection optical system 30, and the reference numeral 45a3 is the screwing portion 45a3 of the second projection optical system 40.

FIG. 7 is a perspective view of the illumination unit 20, the projection lens unit 31, and the light modulation unit 10 as viewed from the direction A in FIG.
An upper surface 26b orthogonal to the Y direction in the figure is provided on the upper portion of the housing-like portion 261 of the illumination bracket 26. In the four corners of the upper surface 26b, through holes through which screws for screwing the first projection optical system 30 pass are provided (in FIG. 7, the through holes 26c1 and 26c2 are shown, and the rest The through hole is not shown). Further, positioning holes 26e1 and 26e2 for positioning the first projection optical system 30 in the illumination unit 20 are provided adjacent to the through holes 26c1 and 26c2 on the near side in the X direction in the drawing. Of the two positioning holes provided on the near side in the X direction in the figure, the positioning hole 26e1 on the arrangement side of the color wheel 21 is a main reference for positioning and has a round hole shape. Further, the positioning hole 26e2 on the side opposite to the color wheel 21 arrangement side is a secondary reference for positioning, and is a long hole extending in the Z direction. Further, the periphery of each of the through holes 26c1 and 26c2 protrudes from the upper surface 26b of the illumination bracket 26, and serves as a positioning projection 26f for positioning the first projection optical system 30 in the Y direction. When the positional accuracy in the Y direction is increased without providing the positioning protrusions 26f, it is necessary to increase the flatness of the entire upper surface of the illumination bracket 26, which increases the cost. On the other hand, by providing the positioning projection 26f, it is only necessary to increase the flatness of only the portion of the positioning projection 26f. Therefore, the cost can be reduced and the positional accuracy in the Y direction can be increased.

  In addition, a light shielding plate 262 into which the lower portion of the projection lens unit 31 is fitted is provided in the opening on the upper surface of the illumination bracket 26 to prevent light from entering the housing-like portion 261 from above.

  Further, as will be described later, the second projection optical system 40 is notched between the through holes 26c1 and 26c2 on the upper surface 26b of the illumination bracket 26 so as not to interfere with the screwing of the second projection optical system 40 to the first projection optical system 30. ing.

  A protruding light source positioning portion 64a3 (see FIG. 5) provided on the upper surface of the holder 64 of the light source portion 60 is fitted to the end portion of the illumination bracket 26 on the color wheel 21 side (the front side in the Z direction in the drawing). A cylindrical light source positioned portion 26a3 having a through hole formed in the vertical direction is provided. Further, below the light source positioned portion 26a3, two protruding light source positioned portions 26a1 into which two hole-shaped light source positioning portions 64a1 and 64a2 provided on the light source bracket 62 side of the holder 64 are fitted. 26a2 are provided. Then, the three light source positioning portions 64a1 to 64a3 of the holder 64 are fitted into the three light source positioned portions 26a1 to 26a3 provided on the illumination bracket 26 of the illumination unit 20, so that the light source unit 60 is provided with the illumination unit. Positioned and fixed to 20 (see FIG. 4).

  An illumination cover 28 is attached to the illumination bracket 26 so as to cover the color wheel 21 and the light tunnel 22.

FIG. 8 is an explanatory diagram showing the optical path L in the illumination unit 20.
The color wheel 21 has a disk shape and is fixed to the motor shaft of the color motor 21a. The color wheel 21 is provided with filters such as R (red), G (green), and B (blue) in the rotation direction. Light collected by a reflector (not shown) provided in the holder 64 of the light source unit 60 passes through the emission window 63 and reaches the peripheral end of the color wheel 21. The light that reaches the peripheral end of the color wheel 21 is separated into R, G, and B light in a time-sharing manner by the rotation of the color wheel 21.

  The light separated by the color wheel 21 enters the light tunnel 22. The light tunnel 22 has a rectangular tube shape, and the inner peripheral surface thereof is a mirror surface. The light that has entered the light tunnel 22 is reflected by the inner peripheral surface of the light tunnel 22 a plurality of times, is converted into a uniform surface light source, and is emitted toward the relay lens 23.

  The light passing through the light tunnel 22 passes through the two relay lenses 23, is reflected by the cylinder mirror 24 and the concave mirror 25, and is focused on the image generation surface of the DMD 12 to form an image.

FIG. 9 is a perspective view of the light modulation unit 10.
As shown in FIG. 9, the light modulation unit 10 includes a DMD board 11 on which a DMD 12 is mounted. The DMD 12 is mounted on a socket 11 a provided on the DMD board 11 with an image generation surface on which micromirrors are arranged in a lattice shape facing upward. The DMD board 11 is provided with a drive circuit for driving the DMD mirror. A heat sink 13 as light modulation element cooling means for cooling the DMD 12 is fixed to the back surface of the DMD board 11 (the surface opposite to the surface on which the socket 11a is provided). A portion of the DMD board 11 where the DMD 12 is mounted passes through a through hole (not shown). The heat sink 13 is formed with a protrusion 13a (see FIG. 8) to be inserted into the through hole. The tip of the protrusion 13a is planar. The protrusion 13a is inserted into a through hole (not shown), and the flat surface at the tip of the protrusion 13a is brought into contact with the back surface (the surface opposite to the image generation surface) of the DMD 12. A heat transfer sheet that can be elastically deformed is affixed to the flat portion or the place where the heat sink 13 on the back surface of the DMD 12 abuts to improve the adhesion between the flat portion of the protrusion 13a and the back surface of the DMD 12, thereby increasing the thermal conductivity. May be.

  The heat sink 13 is pressed and fixed to the surface opposite to the surface on which the socket 11a of the DMD board 11 is provided by the fixing member 14. The fixing member 14 has a plate-like fixing portion 14a facing the right side portion of the rear surface of the DMD board 11 in the drawing and a plate-like fixing portion 14a facing the left portion of the rear surface of the DMD board 11 in the drawing. doing. A pressing portion 14b provided to connect the left and right fixing portions is provided near one end and the other end in the X direction of each fixing portion.

  When the light modulation unit 10 is screwed to the lighting bracket 26 (see FIG. 7), the heat sink 13 is pressed and fixed to the surface opposite to the surface on which the socket 11a of the DMD board 11 is provided by the fixing member 14. The

  Below, fixation of the illumination bracket 26 of the light modulation part 10 is demonstrated. First, the light modulation unit 10 is positioned on the illumination bracket 26 so that the DMD 12 faces the opening surface of the irradiation through hole 26d provided on the lower surface of the illumination bracket 26 of the illumination unit 20 shown in FIG. Next, a screw is inserted from the lower side in the drawing so as to pass through a through hole (not shown) provided in the fixing portion 14 a and the through hole 15 of the DMD board 11. Then, a screw is screwed into a screw hole provided on the lower surface of a screwing portion 263 (see FIG. 4) provided on the illumination bracket 26 to fix the light modulation unit 10 to the illumination bracket 26. Further, when a screw is screwed into a screwing portion 263 provided on the lighting bracket 26, the pressing portion 14b presses the heat sink 13 on the DMD board side. Thereby, the heat sink 13 is pressed and fixed by the fixing member 14 to the surface opposite to the surface on which the socket 11a of the DMD board 11 is provided.

  As described above, the light modulation unit 10 is fixed to the illumination bracket 26, and the three legs 29 shown in FIG. 6 also support the weight of the light modulation unit 10.

  A plurality of movable micromirrors are arranged in a lattice pattern on the image generation surface of the DMD 12. Each micromirror can tilt the mirror surface by a predetermined angle around the twist axis, and can have two states of “ON” and “OFF”. When the micromirror is “ON”, the light from the light source 61 is reflected toward the first optical system 70 (see FIG. 3) as indicated by the arrow L2 in FIG. When “OFF”, the light from the light source 61 is reflected toward the OFF light plate 27 held on the side surface of the illumination bracket 26 shown in FIG. 7 (see arrow L1 in FIG. 8). Therefore, by driving each mirror individually, light projection can be controlled for each pixel of the image data, and an image can be generated.

  The light reflected toward the OFF light plate 27 (not shown) is absorbed as heat and cooled by the flow of outside air.

FIG. 10 is a perspective view showing the first projection optical system 30 together with the illumination unit 20 and the light modulation unit 10.
As shown in FIG. 11, the first projection optical system 30 is disposed above the illumination unit 20, and the projection lens unit 31 holds a first optical system 70 (see FIG. 3) composed of a plurality of lenses. And a lens holder 32 for holding the projection lens unit 31. The lens holder 32 is provided with four leg portions 32a1 to 32a4 extending downward (only the leg portions 32a2 and 32a3 are shown in FIG. 10. The leg portion 32a1 is shown in FIG. 4 and the leg portion 32a4. 6), screw holes for being screwed to the illumination bracket 26 are formed on the bottom surfaces of the leg portions 32a1 to 32a4.

  The projection lens unit 31 is provided with a focus gear 36, and the idler gear 35 is engaged with the focus gear 36. A lever gear 34 meshes with the idler gear 35, and a focus lever 33 is fixed to the rotation shaft of the lever gear 34. The tip portion of the focus lever 33 is exposed from the apparatus main body as shown in FIG.

  When the focus lever 33 is moved, the focus gear 36 is rotated via the lever gear 34 and the idler gear 35. When the focus gear 36 rotates, a plurality of lenses constituting the first optical system 70 in the projection lens unit 31 move in predetermined directions, and the focus of the projection image is adjusted.

  Further, the lens holder 32 has screw through holes 32c1 to 32c3 through which screws 48 for screwing the second projection optical system 40 to the first projection optical system 30 pass (four in FIG. 10). Three screw through holes are shown, and each screw through hole 32c1 to 32c3 shows a state in which the screw 48 is penetrated. It is the tip side.) In addition, second projection optical system positioning protrusions 32d1 to 32d3 protruding from the surface of the lens holder 32 are formed around the screw through holes 32c1 to 32c4 (32d1 to 32d3 are shown in FIG. 10). .

11 is a cross-sectional view taken along line AA in FIG.
As shown in FIG. 11, positioned protrusions 32b1 and 32b2 are provided on the leg portions 32a1 and 32a2. The positioning protrusion 32b1 on the right side in the drawing is inserted into a round hole-shaped positioning hole 26e1, which is a main reference for positioning, provided on the upper surface 26b of the illumination bracket 26. In addition, the positioning protrusion 32b2 on the left side in the drawing is inserted into a long hole-shaped positioning hole 26e2 which is a positioning reference. Thereby, positioning in the Z-axis direction and the X-axis direction is performed. Then, screws 37 are inserted into through holes 26c1 to 26c4 provided on the upper surface 26b of the illumination bracket 26, and the screws 37 are screwed into screw holes provided in the leg portions 32a1 to 32a4 of the lens holder 32. As a result, the first projection optical system 30 is positioned and fixed to the illumination unit 20.

  The upper side of the projection lens unit 31 with respect to the lens holder 32 is covered with a mirror holder 45 (see FIG. 13) of the second projection optical system described later. As shown in FIG. 4, the portion between the lens holder 32 below the lens holder 32 of the projection lens unit 31 and the upper surface 26b of the illumination bracket 26 of the illumination unit 20 is exposed. However, since the projection lens unit 31 is fitted with the lens holder 32, light does not enter the optical path of the image from the exposed portion.

  FIG. 12 is a perspective view showing the second optical system included in the second projection optical system 40 together with the projection lens unit 31, the illumination unit 20, and the light modulation unit 10. As shown in FIG. 12, the second projection optical system 40 includes a folding mirror 41 and a concave curved mirror 42 constituting the second optical system. The surface of the curved mirror 42 that reflects the light can be a spherical surface, a rotationally symmetric aspherical surface, a free curved surface shape, or the like.

  FIG. 13 is a perspective view showing the second projection optical system 40 together with the first projection optical system 30, the illumination unit 20, and the light modulation unit 10. As shown in FIG. 13, the second projection optical system 40 transmits a light image reflected from the curved mirror 42 and also includes a transmission glass 51 for protecting the optical system components in the apparatus.

  The second projection optical system 40 has a mirror bracket 43 that holds the folding mirror 41 and the transmission glass 51. Further, it also has a free mirror bracket 44 that holds the curved mirror 42, a mirror bracket 43, and a mirror holder 45 to which the free mirror bracket 44 is attached.

  The mirror holder 45 has a box shape, and has an upper surface, a lower surface, and a back side in the X direction in the drawing, and has a substantially U-shape when viewed from above. Edges extending in the X direction on the Z direction front side and the back side of the upper opening of the mirror holder 45 are inclined so as to rise from the X direction front side end portion to the X direction back side in the drawing. Part and a parallel part parallel to the X direction in the figure. Further, the inclined portion is on the near side in the X direction in the figure from the parallel portion. Further, the edge of the upper opening of the mirror holder 45 extending in the Z direction on the near side in the X direction in the drawing is parallel to the Z direction in the drawing.

  The mirror bracket 43 is attached to the upper part of the mirror holder 45. The mirror bracket 43 has an inclined surface 43a that is inclined so as to rise from the front end portion in the X direction in the drawing in contact with the inclined portion of the upper opening edge of the mirror holder 45 to the far side in the X direction. . In addition, the mirror holder 45 also has a parallel surface 43b parallel to the X direction that contacts the parallel portion of the upper opening edge of the mirror holder 45. Each of the inclined surface 43a and the parallel surface 43b has an opening, the folding mirror 41 is held so as to close the opening of the inclined surface 43a, and is transmitted so as to close the opening of the parallel surface 43b. A glass 51 is held.

  The folding mirror 41 is positioned and held on the inclined surface 43 a of the mirror bracket 43 by pressing both ends in the Z direction against the inclined surface 43 a of the mirror bracket 43 by a plate pressing member 46 having a leaf spring shape. The one end of the folding mirror 41 in the Z direction is fixed by two mirror pressing members 46, and the other end is fixed by one mirror pressing member 46.

  The transmissive glass 51 is positioned and fixed to the mirror bracket 43 by pressing both ends in the Z direction against the parallel surface 43b of the mirror bracket 43 by the plate spring-like glass pressing members 47. The transmissive glass 51 is held by one glass pressing member 47 at each of both ends in the Z direction.

  The free mirror bracket 44 that holds the curved mirror 42 has arm portions 44a that are inclined so as to descend from the rear side in the X direction toward the front side in the figure on the front side and the rear side in the Z axis direction. The free mirror bracket 44 has a connecting portion 44b that connects the two arm portions 44a at the upper portion of the arm portion 44a. The free mirror bracket 44 has an arm portion 44 a attached to the mirror holder 45 so that the curved mirror 42 covers the opening on the back side in the X direction of the mirror holder 45 in the figure.

  In the curved mirror 42, the substantially central portion of the end portion on the side of the transmissive glass 51 is pressed against the connecting portion 44b of the free mirror bracket 44 by a free spring holding member 49 having a leaf spring shape. Further, both ends in the Z-axis direction in the drawing on the first optical system side of the curved mirror 42 are fixed to the arm portion 44a of the free mirror bracket 44 by screws.

  The second projection optical system 40 is stacked and fixed on the lens holder 32 of the first projection optical system 30. Specifically, a lower surface 451 facing the upper surface of the lens holder 32 is provided below the mirror holder 45. On the lower surface 451, four cylindrical screwing portions 45a1 to 45a3 for screwing to the first projection optical system 30 are formed (see FIG. 12 for screwing portions 45a1 and 45a2). (Refer to FIG. 6 for the stopper 45a3, and the remaining screws are not shown). The second projection optical system 40 passes the screws 48 through the screw through holes 32c1 to 32c3 provided in the lens holder 32 of the first projection optical system 30, and screws the screws 48 into the screw fixing portions 45a1 to 45a3. Thus, the first projection optical system 30 is screwed. At this time, the lower surface of the mirror holder 45 of the second projection optical system 40 comes into contact with the second projection optical system positioning protrusions 32d1 to 32d4 of the lens holder 32, and the second projection optical system 40 is positioned in the Y direction. Fixed.

  When the second projection optical system 40 is mounted and fixed on the lens holder 32 of the first projection optical system 30, as shown in FIG. 10, the portion above the lens holder 32 of the projection lens unit 31 is the second projection optical system. It is stored in the mirror holder 45 of the system 40. Further, when the second projection optical system 40 is mounted and fixed on the lens holder 32, there is a gap between the curved mirror 42 and the lens holder 32, and the idler gear 35 (see FIG. 10) enters the gap. It becomes a shape.

FIG. 14 is a perspective view showing an optical path from the first optical system 70 to the projection surface 101 (screen).
The light beam transmitted through the projection lens unit 31 constituting the first optical system 70 forms an intermediate image conjugate with the image generated by the DMD 12 between the folding mirror 41 and the curved mirror 42. This intermediate image is formed as a curved surface image between the folding mirror 41 and the curved mirror 42. Next, the divergent light beam after forming the intermediate image is incident on the concave curved mirror 42 and becomes a convergent light beam. The curved mirror 42 converts the intermediate image into a “further enlarged image” on the projection surface 101. Projection imaging.

  As described above, the projection optical system is configured by the first optical system 70 and the second optical system, and an intermediate image is formed between the first optical system 70 and the curved mirror 42 of the second optical system. By performing the enlarged projection with the mirror 42, the projection distance can be shortened, and it can be used even in a narrow conference room.

  As shown in FIG. 14, the first projection optical system 30 and the second projection optical system 40 are stacked and fixed on the illumination bracket 26. Further, the light modulation unit 10 is also fixed. Therefore, the leg portion 29 of the illumination bracket 26 is fixed to the base member 53 so as to support the weight of the first projection optical system 30, the second projection optical system 40, and the light modulation unit 10.

  FIG. 15 is a schematic diagram showing an arrangement relationship of each part in the apparatus. As illustrated in FIG. 15, the light modulation unit 10, the illumination unit 20, the first projection optical system 30, and the second projection optical system 40 are stacked in the Y direction, which is the minor axis direction of the projection surface. The light source unit 60 is arranged in the Z direction, which is the major axis direction of the projection plane, with respect to the stacked body in which the light modulation unit 10, the illumination unit 20, the first projection optical system 30, and the second projection optical system 40 are stacked. Yes. As described above, in this embodiment, the light modulation unit 10, the illumination unit 20, the first projection optical system 30, the second projection optical system 40, and the light source unit are parallel to the projection image and the projection plane 101. They are arranged side by side in a certain Y direction or Z direction. More specifically, in the direction in which the image forming unit A composed of the light modulation unit 10 and the illumination unit 20 and the projection optical unit B composed of the first projection optical system 30 and the second projection optical system 40 are stacked. The light source unit 60 is connected to the image forming unit A in a direction orthogonal to the image forming unit A. Further, the image forming unit A and the light source unit 60 are disposed on the same straight line parallel to the base member 53. The image forming unit A and the projection optical unit B are arranged on the same straight line perpendicular to the base member 53, and are arranged in the order of the image forming unit A and the projection optical unit B from the base member 53 side. . Thereby, it can suppress that the installation space of an apparatus is taken in the direction orthogonal to the surface of the projection image projected on the projection surface 101. FIG. Accordingly, when the image projection apparatus is used on a desk or the like, the apparatus can be prevented from interfering with the arrangement of the desk or chair even in a small room.

  In the present embodiment, a power supply unit 80 for supplying power to the light source 61 and the DMD 11 is disposed above the light source unit 60 in a stacked manner. The light source unit 60, the power source unit 80, the image forming unit A, and the projection optical unit B are composed of the upper surface of the projector described above, the base member 53, and an exterior cover 59 (see FIG. 21) that covers the periphery of the projector 1. It is stored in the container of the projector 1.

FIG. 16 is a perspective view showing the internal configuration of the projector 1, and FIG. 17 is an explanatory diagram for explaining the flow of air in the projector. In FIG. 16, the power supply unit 80 is not shown.
As shown in FIGS. 16 and 17, one of the side surfaces of the projector 1 (the right side in the drawing) is provided with an intake port 85 that is open for taking outside air into the projector 1. On the other side (left side in the figure) of the projector 1, an intake / exhaust port 84 is provided that takes in outside air into the projector 1 and exhausts air inside the projector 1. Further, an intake axial flow fan 86 is provided so as to face the intake port 97a for taking in air for cooling the light source 61 in the light source housing 97 that houses the light source unit 60. The intake axial flow fan 86 is disposed with the intake surface directed toward the operation portion 83 and the discharge surface directed toward the intake port 97a. In addition, at least a part of the intake / exhaust port 84 and the intake port 85 is positioned above the intake axial flow fan 86 in the vertical direction (Y direction in the drawing).

FIG. 18 is a diagram showing the positional relationship among the intake axial flow fan 86, the light source housing 97, and the sirocco fan 95.
As shown in FIG. 18, an opening 97b is provided at a location facing the light source exhaust port 64b of the light source housing 97, and suction is performed on both sides so as to oppose the light source exhaust port 64b through the opening 97b. A sirocco fan 95 of the type is provided. Specifically, one suction surface of the sirocco fan 95 is disposed so as to face the light source exhaust port 64b, and the other suction surface 95b faces the side surface of the exterior cover 59 of the apparatus. Further, the exhaust port 95c of the sirocco fan 95 is arranged so that the exhaust of the sirocco fan 95 is directed to the heat sink 13 for cooling the DMD 12.

  As shown in FIG. 17, an exhaust axial fan 91 is provided on the lower left side of the apparatus main body so as to face the lower side of the intake / exhaust port 84.

FIG. 19 is a perspective view showing the flow of air taken in by the intake axial flow fan 86.
The intake surface of the intake axial flow fan 86 faces the operation unit 83. Accordingly, a flow path that descends toward the light source side is formed in the space between the light source unit 60 and the operation unit 83. As a result, the air heated by the light source unit 60 and rising toward the operation unit 83 is lowered by the airflow descending toward the light source unit 60. As a result, it is possible to suppress the air heated by the light source unit 60 from hitting the operation unit 83, and to suppress an increase in temperature of the operation unit 83.

  In addition, due to intake by the intake axial flow fan 86, the space between the light source unit 60 and the operation unit 83 becomes negative pressure, and outside air is taken in from the intake port 85 and the intake / exhaust port 84, and the outside air is converted into the light source unit 60. And flow into the flow path between the operation unit 83. In the present embodiment, as shown in FIG. 17, the intake port 85 is positioned above the intake axial flow fan 86. Therefore, the outside air taken in from the intake port 85 becomes a downward airflow that flows from the upper intake port 85 to the lower intake axial fan 86.

  Between the back surface of the curved mirror 42 and the exterior cover 59 facing the back surface, or between the mirror holder 45 and the exterior cover 59 of the second projection optical system 40, there is a flow path (gap) for air to flow. Is formed. Therefore, outside air taken in from the upper portion of the intake / exhaust port 84 not facing the exhaust axial flow fan 91 flows between the mirror holder 45 and the exterior cover 59, the back surface of the curved mirror 42, and the exterior cover 59. It flows into the flow path between the light source part 60 and the operation part 83 through the flow path between them.

  The exhaust air intake port 84 takes in outside air, the flow path between the mirror holder 45 and the exterior cover 59, and the flow path between the back surface of the curved mirror 42 and the exterior cover 59 from the exhaust axial flow fan 91. Is also above. Therefore, the outside air taken in from the intake / exhaust port 84 also becomes a descending airflow that flows downward from above. As a result, in the space above the light source unit 60 in the apparatus main body, a layer of descending airflow directed toward the intake axial fan 86 is formed. Thereby, it is possible to inhibit the air that has been heated and raised by the light source unit 60 from being directed to the operation unit 83 by the layer of the descending airflow. Thereby, the temperature rise of the operation part 83 can be suppressed favorably.

  In addition, the air taken into the apparatus main body through the intake port 85 first passes in the vicinity of the operation unit 83, cools the self-heating of the operation unit 83, and then flows into the light source housing 97 through the intake axial fan 86. Go. Therefore, the temperature rise due to the self-heating of the operation unit 83 itself can be satisfactorily suppressed.

FIG. 20 is a perspective view of the projector showing the arrangement relationship of the power supply unit 80.
As shown in FIG. 20, the power supply unit 80 is provided between the intake axial fan 86 and the operation unit 83 in the vertical direction, and travels toward the light source between the light source unit 60 and the operation unit 83. It is provided so as to form the side surface of the flow path. The power supply unit 80 includes a large number of electric elements such as capacitors, coils, and resistors, and these electric elements generate heat and the temperature rises. When the temperature of the power supply unit 80 rises and becomes high, the operation performance and the durability may be deteriorated. In general, the power supply unit 80 has a rated temperature of 100 ° C., and when the temperature exceeds 100 ° C., the power supply is cut off by a thermal switch (not shown) provided in the power supply unit 80. . In order to avoid the temperature rise of the power supply unit 80, it may be possible to provide a heat sink or the like in an electric element such as a capacitor, a coil, or a resistor, but this leads to an increase in the cost of the apparatus.

  In the present embodiment, as shown in FIG. 20, the power supply unit 80 is provided in such a manner as to form a side surface of the descending flow path toward the light source between the light source unit 60 and the operation unit 83. Therefore, the power supply unit 80 can be cooled by the air taken into the apparatus main body through the intake port 85. In addition, the power supply unit 80 can be cooled by air having a low temperature before the light source unit 60 is cooled. Thereby, the power supply part 80 can be cooled favorably and the performance of the power supply part 80 and the fall of durability can be suppressed.

21 is a perspective view showing the flow of air for cooling the light source unit 60, FIG. 22 is a perspective view with the intake axial flow fan 86 removed, and FIG. 23 is seen from the direction D in FIG. FIG.
The air sucked by the suction axial flow fan 86 flows to the intake port 97a of the light source housing shown in FIG. Part of the cooling air that has flowed from the intake port 97a into the light source housing 97 flows to the light source inlet port 64c that faces the intake axial flow fan 86 via the intake port 97a.
The air that has flowed into the light source inlet 64 c passes through the holder 64, cools the light emitting portion of the light source 61, the reflector, and the like, and then is exhausted from the light source exhaust port 64 b provided on the side surface of the holder 64. The air exhausted from the light source exhaust port 64 b passes through the opening 97 b of the light source housing 97 and is sucked into one suction surface 95 a of the sirocco fan 95.

  The air that has flowed outside the light source inlet 64 c cools the outer periphery of the light source 61, passes through the opening 97 b of the light source housing 97, and is sucked into one suction surface 95 a of the sirocco fan 95.

  In the present embodiment, a high-pressure mercury lamp is used as the light source 61. When the light source 61 is at a high temperature, the deterioration of the seal portion for sealing the gas in the light source 61 is accelerated, and the life is shortened. When a high-pressure mercury lamp is used as the light source, the sealing portion of the light source 61 must be 270 to 350 ° C. or lower, and the bulb temperature must be suppressed to 1000 ° C. or lower. In the present embodiment, the seal portion of the light source 61 can be suppressed to 350 ° C. or lower and the bulb temperature can be suppressed to 850 to 870 ° C. by the cooling air flowing into the light source housing 97 from the intake port 97a.

  The air that takes heat away from the high temperature light source unit 60 and cools the light source unit 60 is heated to a high temperature. In particular, the air exhausted from the light source exhaust port 64b after cooling the high temperature reflector becomes very high temperature. When the air in the light source housing 97 is exhausted by a one-side suction type sirocco fan or an axial fan, the exterior cover 59 is heated by the air after cooling the light source that has been heated to a side surface near the light source unit 60. The problem that the base member 53 becomes high temperature will newly arise. In addition, the temperature of the components and the elements of the electric device arranged on the downstream side in the air flow direction after cooling the light source is higher than that of the sirocco fan.

  Therefore, in the present embodiment, the air after cooling the light source after cooling the light source unit 60 exhausted from the light source housing 97 using the both-side suction type sirocco fan 95, and air having a lower temperature than the air after cooling the light source, The air was exhausted after cooling the light source.

  As shown in FIGS. 22 and 23, the sirocco fan 95 is disposed so that one intake surface 95 a of the sirocco fan 95 faces the light source exhaust port 64 b through the opening 97 b of the light source housing 97. As a result, one of the intake surfaces 95a of the sirocco fan 95 can suck in hot air in the light source housing 97, and the other intake surface 95b can take in cold air inside the apparatus. The cylindrical fan as an agitating member provided inside the sirocco fan 95 has a large number of blades and has a high air agitating ability. Therefore, it is possible to satisfactorily stir the high-temperature air-cooled air sucked from one intake surface 95a and the low-temperature air sucked from the other intake surface 95b inside the sirocco fan as a mixing unit. In this manner, the air after cooling the high-temperature light source inside the sirocco fan 95 and the low-temperature air inside the apparatus are agitated to exhaust air having a temperature intermediate between the two air from the exhaust port 95c of the sirocco fan 95. can do. Thereby, the temperature rise of the air exhausted from the exhaust port 95c of the sirocco fan 95 can be suppressed.

  In addition, the light source unit 60 sends air to the light source housing 97 by the intake axial flow fan 86 and is cooled by forced air cooling. Also, since the volume of the light source housing 97 itself is small, the air flowing into the light source housing 97 is used. The flow rate of is faster. On the other hand, since the inside of the apparatus has a large volume, the flow velocity of air flowing inside the apparatus is generally slower than the flow velocity of air flowing inside the light source housing 97. Therefore, as in the image projection apparatus of Patent Document 1, air after cooling the light source from the light source housing 97 and low-temperature air inside the apparatus are caused to flow through the duct, and the air flows in the duct. When mixing, it is easy to separate into a low-temperature air layer and a light-air-cooled air layer due to the difference in flow velocity. On the other hand, as in the present embodiment, forcible stirring inside the sirocco fan by the cylindrical fan allows mixing without being divided into two air layers.

  In the present embodiment, the sirocco fan 95 is disposed so as to face the light source exhaust port 64 b through the opening 97 b of the light source housing 97. Accordingly, it is possible to prevent the side surface near the light source unit 60 and the base member 53 from being heated by the air exhausted from the light source housing 97. Moreover, the air after light source cooling immediately after exiting from the opening 97b of the light source housing 97 can be cooled. As a result, it is possible to prevent the temperature of the components and the elements of the electric device on the downstream side in the air flow direction after cooling the light source from the opening 97b of the light source housing 97.

  Further, in the present embodiment, the double-sided suction type sirocco fan 95 is used as a mixing means for mixing the air after cooling the light source and the low-temperature air in the apparatus. Thus, unlike the image projection apparatus described in Patent Document 1 in which a duct is provided from the light source to the exhaust port of the apparatus, and the air after cooling the light source is mixed in the duct with the low-temperature air in the apparatus, a very short flow The temperature can be lowered in the road. As a result, compared with the image projection apparatus described in Patent Document 1, space saving inside the housing can be achieved, and the apparatus can be downsized.

  Further, by sucking air inside the apparatus from the other intake surface 95b of the sirocco fan 95, the periphery of the sirocco fan 95 becomes negative pressure. Therefore, a part of the air taken in from the intake port 85 disposed above the sirocco fan 95 flows to the sirocco fan 95. Thereby, a descending airflow from the air inlet 85 toward the sirocco fan 95 is also generated inside the apparatus, and it is possible to further suppress the air heated by the light source unit 60 from rising to the operation unit 83.

FIG. 24 is a perspective view showing the air flow from the sirocco fan 95 to the intake / exhaust port 84.
As shown in FIG. 24, the air exhausted from the exhaust port 95 c of the sirocco fan 95 moves toward the exhaust axial fan 91 by the intake air of the exhaust axial fan 91. The air exhausted from the exhaust port 95c flows into the heat sink 13 for cooling the DMD 12 disposed between the exhaust axial flow fan 91 and the sirocco fan 95 in the Z direction in the figure, and the heat dissipated from the heat sink 13 To the intake / exhaust port 84. As described above, the air exhausted from the sirocco fan 95 flowing to the heat sink 13 is mixed with low-temperature air and the temperature is lowered. Therefore, even with the air exhausted from the sirocco fan 95, the heat sink 13 can be cooled satisfactorily, and a decrease in the cooling efficiency of the heat sink 13 can be suppressed.

  Although the rated temperature of the DMD 12 is stricter than that of the power supply unit 80 at 90 ° C., the DMD 12 is configured to actively dissipate heat by the heat sink 13. Therefore, the temperature of the DMD 12 does not exceed the rated temperature even if the air is slightly heated from the exhaust port 95c of the sirocco fan 95.

  The air deprived of heat from the heat sink 13 is exhausted from the intake / exhaust port 84 to the outside by the exhaust axial flow fan 91.

  Next, a modification of this embodiment will be described.

[Modification]
FIG. 25 is a main part perspective view showing a modified projector.
As shown in FIG. 25, in the projector according to this modification, an intake axial fan 86 is disposed so as to face the intake port 85. Further, a duct 99 is provided between the light source unit 60 and the operation unit 83 to guide the outside air taken from the intake port 85 to the intake port 97a of the light source housing 97.

  In this way, by arranging the intake axial flow fan 86 so as to face the intake port 85, it is possible to efficiently take in outside air from the intake port 85. Further, by providing the duct 99, the outside air taken in from the intake port 85 can be efficiently sent to the light source housing 97. Thereby, the light source 61 can be cooled favorably.

  Further, as indicated by Z1 and Z2 in the figure, the duct 99 extends from the device center side end (Z1) of the operation unit 83 to the device center side. Thereby, it is possible to suppress the air heated by the heat of the light source unit 60 inside the apparatus from hitting the operation unit 83 by the duct 99. Further, the temperature around the duct 99 is lowered by the low temperature air flowing in the duct 99. Therefore, the high-temperature air flowing around the duct 99 is mixed with the low-temperature air around the duct 99 and the temperature is lowered. Thereby, it is possible to prevent the temperature of the upper surface around the operation unit 83 from rising.

FIG. 26 is a diagram illustrating the air flow in the projector according to the modification.
As shown in FIG. 26, the outside air taken in from the intake port 85 by the intake axial flow fan 86 flows downward from above due to the shape of the duct 99 bent in an L shape, and flows into the light source housing 97. As described above, since the air current flows downward from above in the duct 99, it is possible to prevent the air heated from the light source housing 97 from rising in the duct 99.

  As described above, part of the air flowing into the light source housing 97 from the duct 99 flows into the light source inlet 64c, cools the light emitting portion of the light source 61, the reflector, and the like, and the rest flows in the light source housing 97. The outer periphery of the light source 61 is cooled. Then, as described above, the sirocco fan 95 is agitated with low-temperature air and exhausted from the exhaust port of the sirocco fan 95 whose temperature has been lowered. Thereafter, as described above, the heat flows to the heat sink 13, cools the heat sink 13, and is then discharged out of the apparatus by the exhaust axial flow fan 91.

  Also in this modification, a part of the wall constituting the duct 99 may be configured by the power supply unit 80, and the power supply unit 80 may be cooled by the air flowing from the air inlet 85 to the light source housing 97. Further, in this modification, the air sucked from the intake port 85 by the intake axial flow fan 86 is caused to flow into the light source housing 97 through the cylindrical duct 99. However, any configuration may be used as long as the air sucked from the intake port 85 is lowered by the intake axial flow fan 86 and guided to the intake port 97 a of the light source housing 97. For example, only the wall portion (99a shown in FIG. 26) extending upward (operation portion) from the edge portion on the apparatus center side of the intake port 97a may be used. Even in such a configuration, the air sucked from the suction port 85 by the suction axial flow fan 86 hits the wall portion 99a and then descends toward the intake port 97a of the light source housing 97 that has become negative pressure due to the suction of the sirocco fan 95. . Further, the wall 99a may be an inclined surface with the upper portion positioned on the intake port 85 side. Even with this configuration, the air sucked from the intake port 85 by the intake axial fan 86 can be lowered toward the intake port 97 a of the light source housing 97.

  In the above description, the light source cooling air is sent to the light source housing 97 by the intake axial flow fan 86, but the light source cooling air may be sent to the light source housing 97 by the suction of the sirocco fan 95. With such a configuration, the intake axial flow fan 86 can be eliminated, and problems such as an increase in the number of parts, an increase in cost, and an increase in weight can be solved.

  In the present embodiment, the double-sided intake sirocco fan is used to stir and discharge the air after cooling the light source and the low-temperature air inside the apparatus. However, the present invention is not limited to this. For example, the structure which provided the duct which takes in the air after light source cooling and the low temperature air inside an apparatus, and the stirring member which stirs air, such as a screw in this duct, may be provided. Also in this case, the air after cooling the light source in the duct and the low-temperature air inside the apparatus are agitated, and the temperature of the air after cooling the light source can be lowered and discharged from the duct.

What has been described above is an example, and the present invention has a specific effect for each of the following aspects.
(Aspect 1)
Mixing of light source 61, image projection means such as optical engine unit 100 that projects an image using light from light source 61, air heated by light source 61, and air having a temperature lower than that of air In the image projection apparatus that exhausts the air mixed by the mixing means to the outside of the apparatus, the mixing means includes a mixing unit that takes in and mixes the air heated by the light source 61 and air having a temperature lower than the air, and And a stirring member such as a cylindrical fan that stirs the air in the mixing section.
By providing such a configuration, as described in the embodiment, it is possible to cool the air after cooling the light source well in the mixing unit and exhaust it outside the apparatus.

(Aspect 2)
In (Aspect 1), the mixing means is a double-sided suction type sirocco fan 95, which sucks air heated by the light source 61 from one suction port, and air having a temperature lower than that of the air heated by the light source from the other suction port. Inhale.
By using a double-side suction sirocco fan as the mixing means, the air heated by the light source 61 by the cylindrical fan of the sirocco fan 95 and the air whose temperature has not risen can be agitated. As a result, the air can be cooled well after the light source is cooled in the mixing section and exhausted outside the apparatus.
Further, by using a double-side suction type sirocco fan as the mixing means, as described in the embodiment, the mixing duct into which the air heated by the light source 61 and the air whose temperature has not increased flows, and the mixing duct Compared with a device provided with a stirring member, the space inside the housing can be saved, and the apparatus can be miniaturized.

(Aspect 3)
In (Aspect 2), one suction port 95a of the both-side suction type sirocco fan 95 is opposed to an exhaust port such as an opening 97b through which air heated by the light source 61 of the light source housing 97 that houses the light source 61 is exhausted. Thus, a double-sided suction type sirocco fan 95 was arranged.
By providing such a configuration, as described in the embodiment, it is possible to cool the air after cooling the light source immediately after exiting from the exhaust port such as the opening 97b of the light source housing 97. Thereby, it can suppress that the side surface near the light source part 60 and the base member 53 become high temperature by air after light source cooling. Moreover, the air after light source cooling immediately after exiting from the opening 97b of the light source housing 97 can be cooled. In addition, it is possible to prevent the temperature of the components and the elements of the electric device on the downstream side in the air flow direction after cooling the light source from the opening 97b of the light source housing 97.

(Aspect 4)
In any one of (Aspect 1) to (Aspect 3), the light modulation element such as the heat sink 13 that cools the light modulation element such as the DMD 12 of the image projection unit such as the optical engine unit 100 with the air mixed by the mixing unit. Cool the cooling means.
By providing such a configuration, as described in the embodiment, the temperature rise of the light modulation element such as the DMD 12 can be suppressed.

1: Projector 12: DMD
13: Heat sink 51: Transmission glass 59: Exterior cover 60: Light source unit 61: Light source 64b: Air port 64c after light source cooling: Light source inlet 80: Power source unit 83: Operation unit 84: Intake / exhaust port 85: Inlet port 86: Intake air Axial flow fan 91: exhaust axial flow fan 95: sirocco fan 97: light source housing 97a: intake port 97b: opening 99: duct 99a: wall 100: optical engine unit 101: projection plane A: image forming unit B: Projection optics

JP 2007-316334 A

Claims (4)

A light source;
Image projecting means for projecting an image using light from the light source;
A mixing means for taking in and mixing air heated by the light source and air at a temperature lower than the air;
In the image projection apparatus for exhausting the air mixed by the mixing means to the outside of the apparatus,
The mixing means includes an mixing unit that takes in and mixes air heated by the light source and air at a temperature lower than the air, and a stirring member that stirs the air in the mixing unit. apparatus. The image projection apparatus according to claim 1.
The mixing means is a double-sided suction sirocco fan,
An image projection apparatus, wherein air heated by the light source is sucked from one suction port, and air having a temperature lower than that of the air heated by the light source is sucked from the other suction port. The image projection apparatus according to claim 2.
The both-side suction type sirocco fan is arranged so that one suction port of the both-side suction type sirocco fan faces the exhaust port from which the air heated by the light source of the light source housing that houses the light source is exhausted. An image projection apparatus. The image projection device according to any one of claims 1 to 3,
An image projection apparatus, wherein the light modulation element cooling means for cooling the light modulation element of the image projection unit is cooled by the air mixed by the mixing means.

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