JP6202402B2 - Image projection device - Google Patents

Description

The present invention relates to images projector.

  Conventionally, an image forming unit comprising a DMD (Digital Mirror Device) as an image generating element that generates an image based on image data from a personal computer or the like, and an irradiation unit that irradiates light from the light source to the image generating element. An image projection apparatus is known that forms an image in an image forming unit and forms an image formed by the image forming unit on a projection surface using a projection optical unit (for example, Patent Document 1).

  Specifically, light from a light source that travels parallel to the DMD image generation surface is folded toward the DMD image generation surface by an illumination optical system such as a folding mirror, and is irradiated onto the DMD image generation surface. A plurality of movable micromirrors are arranged in a grid on the image generation surface of the DMD. 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 is reflected toward the projection optical unit. When the micromirror is “OFF”, the light from the light source is reflected toward the light absorber provided inside the apparatus. . Therefore, by driving each mirror individually, the projection of light can be controlled for each pixel of the image data, and an image can be generated. The image generated by the DMD is imaged on the projection plane through the projection optical unit.

  The present applicant arranges the components so that the components are arranged along a direction perpendicular to the installation surface of the apparatus main body, for example, a desk, a wall surface, or a ceiling, on which the apparatus main body is installed, and projects the projection onto the projection plane. An image projection apparatus is being developed in which the length in the direction orthogonal to the plane of the projected image is shortened. When the projection optical unit and the image forming unit are arranged to be connected along the direction perpendicular to the installation surface of the apparatus main body, and the image forming element and the image forming unit include a heat radiating unit, the image forming unit There is a demand for disposing the heat dissipating part between the image forming unit and the member facing the installation surface on which the main body is installed, and for preventing the heat dissipating unit from contacting the member facing the installation surface.

  The image forming unit and the projection optical unit that are connected and arranged along the direction perpendicular to the installation surface are supported so that the heat radiating unit of the image forming unit does not contact the member facing the installation surface of the apparatus main body. As a method, it is conceivable that both the image forming unit and the projection optical unit are fixed to opposite surfaces as has been conventionally done. In other words, it is conceivable to fix the image forming unit and the projection optical unit to a member that forms a surface perpendicular to the installation surface of the apparatus main body. In this case, for example, by providing a support portion such as a screw receiver on a member that forms a surface perpendicular to the installation surface of the apparatus body, and fixing the image forming portion and the projection optical portion to the support portion, the image forming portion and the projection It becomes a structure which receives the weight of an optical part with the member which comprises a surface perpendicular | vertical to the installation surface of an apparatus main body.

  However, in this case, the supporting portion provided on the member constituting the surface perpendicular to the installation surface of the apparatus main body is a member constituting the surface perpendicular to the installation surface of the apparatus main body due to the weight of the image forming unit and the projection optical unit. Since a bending moment is applied, a member constituting a surface perpendicular to the installation surface of the apparatus main body is required to have strength. In order to increase the strength of the members constituting the surface perpendicular to the installation surface of the apparatus main body, it is necessary to increase the thickness of the members constituting the surface perpendicular to the installation surface of the apparatus main body or to provide ribs. The material cost of the member which comprises the surface perpendicular | vertical to the installation surface of a main body increases, and the malfunction that it leads to the high cost of an apparatus arises.

  Furthermore, when fixed to any one of the members constituting a surface perpendicular to the installation surface of the plurality of apparatus main bodies surrounding the image forming unit and the projection optical unit, the weight balance becomes worse, and the image projection device tends to fall down. The ease of falling down of the image projection apparatus due to this poor balance is solved by making the entire image projection apparatus heavy, but if the image projection apparatus is made heavy, the convenience of carrying is reduced.

The present invention has been made in view of the above problems, and its purpose is to achieve a balanced load when optical elements such as an image forming unit and a projection optical unit are arranged in a direction perpendicular to the installation surface of the apparatus main body. to provide a good Ige image projection apparatus.

To achieve the above object, the invention of claim 1 includes a structure including an image forming unit that forms an image using light from a light source and a projection optical unit that projects an image formed by the image forming unit. In the image projection apparatus including the body, the facing portion that faces the installation surface on which the apparatus main body is placed, and the structure is in order of the image forming portion and the projection optical portion from the facing portion side. And a support unit that installs the structure on the facing unit, and the projection optical unit projects onto a plane perpendicular to the installation surface, and is between the image forming unit and the facing unit. A first air flow path provided in
A fan that blows air to the first air flow path, a second air flow path that is provided between the light source and the facing portion, and into which air flows from the first air flow path, The light source is cooled by air flowing into the second air flow path.

According to the first aspect of the present invention, it is possible to provide an image projection apparatus having a good balance of weight when optical elements such as an image forming section and a projection optical section are arranged in a direction perpendicular to the installation surface of the apparatus main body. It becomes possible.

The perspective view which shows the projector and projection surface which concern on this embodiment. 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 unit. The perspective view which shows the optical system components accommodated in the illumination unit with other units. The perspective view which looked at the illumination unit, the projection lens unit, and the image formation unit from the A direction of FIG. The figure explaining the optical path of the light in an illumination unit. The perspective view of an image forming unit. The perspective view which shows a 1st optical unit with an illumination unit and an image formation unit. AA sectional drawing of FIG. The perspective view which shows the 2nd optical system which a 2nd optical unit hold | maintains with a projection lens unit, an illumination unit, and an image formation unit. The perspective view which shows a 2nd optical unit with a 1st optical unit, an illumination unit, and an image formation unit. 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 unit in an apparatus. FIG. 4 is a diagram illustrating an example of use of the projector according to the present embodiment. The figure which shows the usage example of the projector which has arrange | positioned the light source and the illumination unit in the direction orthogonal to a projection surface . The figure which shows the usage example of the conventional projector different from FIG. The figure which shows another example of use of the projector of this embodiment. The perspective view which looked at the installation surface side of the projector. The perspective view which shows a mode that the opening / closing cover 54 was removed from the apparatus. Explanatory drawing explaining the flow of the air in a projector. The perspective view which shows the cooling part which cools DMD etc. with both an illumination unit and a light source unit. FIG. 23 is a cross-sectional view of FIG. 22. The perspective view which shows a horizontal duct, a light source unit, and a base member. The figure which looked at the flow of the air from a horizontal duct to a light source bracket from the lower side. The perspective view which looked at the flow of the air from a horizontal duct to a light source bracket from the upper side. The figure which showed the structure shown in FIG. 21 more concretely. AA sectional drawing of FIG. BB sectional drawing of FIG. CC sectional drawing of FIG. DD sectional drawing of FIG. EE sectional drawing of FIG.

Hereinafter, an embodiment of a projector as an image projection apparatus to which the present invention is applied will be described. FIG. 1 is a perspective view showing a projector 1 and a projection surface 101 such as a screen according to the present embodiment. In the following description, 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 the Z direction.
As shown in FIG. 1, a transmissive glass 51 from which a projected image P is emitted is provided on the upper surface of the projector 1, and the projected image P emitted from the transmissive glass 51 is projected onto a projection surface 101 such as a screen. .
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 optical path diagram from the projector 1 to the projection plane 101.
The projector 1 includes a light source unit (not shown) provided with a light source and an image forming unit A that forms an image using light from the light source. The image forming unit A includes an image forming unit 10 having a DMD 12 (Digital Mirror Device) as an image forming element, and an illumination unit 20 that folds light from a light source and irradiates the DMD 12 to generate an image. ing. In addition, a projection optical unit B for projecting an image onto the projection plane 101 is provided. The projection optical unit B includes at least one refractive optical system and includes a first optical unit 30 including a coaxial first optical system 70 having a positive power, a folding mirror 41, and a curved mirror having a positive power. And a second optical unit 40 provided with 42. A container for storing the optical elements such as the image forming unit A and the projection optical unit B is an exterior cover 59 as shown in FIG. Of the exterior cover 59, the surface provided with the transmissive glass 51 is the cover upper surface 59a, the surface close to the projection surface 101 is the cover front surface 59b, and the surface far from the projection surface 101 is the cover rear surface 59c. The first member facing the installation surface, which is the surface to be mounted, is the base member 53, and the remaining surface is the cover side surface 59d.

  The DMD 12 is irradiated with light from a light source (not shown) by the illumination unit 20 to generate an image. The image generated by the DMD 12 is projected onto the projection surface 101 via the first optical system 70 of the first optical unit 30, the folding mirror 41 of the second optical unit 40, and the curved mirror 42.

FIG. 3 is a schematic perspective view showing the internal configuration of the projector 1.
As shown in FIG. 3, the image forming unit 10, the illumination unit 20, the first optical unit 30, and the second optical unit 40 are arranged side by side in the Y direction, which is a direction parallel to the projection plane. Further, a light source unit 60 is disposed on the right side of the illumination unit 20 in the drawing.

  3 are the leg portions of the lens holder 32 of the first optical unit 30, and the reference numeral 262 is a screwing portion for screwing the image forming unit 10 to the illumination unit 20. .

  Next, the structure of each unit will be described in detail.

First, the light source unit 60 will be described.
FIG. 4 is a schematic perspective view of the light source unit 60.
The light source unit 60 has a light source bracket 62, 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. 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 unit 80 (see FIG. 14).

  A holder 64 holding a reflector (not shown) 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 collected on the emission window by a reflector (not shown) held by the holder and is emitted from the emission window 63.

  Further, light source positioning portions 64a1 to 64a3 are provided on the upper surface of the holder 64 and both ends in the X direction of the lower surface of the holder in order to position the light source unit 60 on the illumination bracket 26 (see FIG. 6) of the illumination unit 20. 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.

  Further, a light source air inlet 64b through which air for cooling the light source 61 flows is provided on the side surface excluding the upper surface of the holder 64. Air heated by the heat of the light source 61 is provided on the upper surface of the holder 64. Is provided with a light source exhaust port 64c through which air is exhausted.

  As will be described later, the light source bracket 62 is provided with a duct portion 65 into which air sucked from an intake blower 91 (see FIG. 21 and the like) flows. Further, in order to allow a part of the air flowing into the duct portion 65 to flow between the light source unit 60 and an opening / closing cover 54 (see FIG. 7) to be described later, on the air inflow side on the near side of the duct portion 65 in the drawing. The opening 65a is provided. The cooling of the light source unit 60 will be described later.

  Further, when the flat surface portion 64d2 provided with the light source positioning protrusion 64a3 and the flat surface portion 64d1 provided with the light source positioning holes 64a1 and 64a2 shown in FIG. It is an abutting part which abuts against the lighting bracket.

Next, the lighting unit 20 will be described.
FIG. 5 is a perspective view showing the optical system components housed in the illumination unit 20 together with other units.
As shown in FIG. 5, 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. 6) is attached to the side opening on the back 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. As a result, 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 either the illumination bracket 26 or the OFF light plate 27 (see FIG. 6). It is covered with a cover member not shown in the drawing.

  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 the base member 53 (see FIG. 19) of the projector 1 and support the weight of the first optical unit 30 and the second optical unit 40 that are stacked and fixed on the illumination bracket 26. Further, by providing the leg portions 29, heat generated in the DMD 12 of the image forming unit 10 is dissipated, and the outside air flows into the heat sink 13 (see FIG. 6) as a heat dissipating portion for cooling the DMD 12, as will be described later. A space for inflow is formed. In general, since the member is stronger in the axial force than the bending moment, the base member 53 and the leg portion 29 can easily ensure sufficient rigidity to support the image forming unit A and the projection optical unit B. it can. Therefore, compared with the configuration in which the image forming unit A and the projection optical unit B are fixed to the cover front surface 59b, the cover rear surface 59c, or the cover side surface 59d of the exterior cover 59 shown in FIG. 1, the cover front surface 59b, the cover rear surface 59c or The heat sink 13 can be disposed between the image forming portion A and the base member 53 without considering the strength of the cover side surface 59d. Two of the three leg portions 29, one leg portion 29b, is provided at each end of the side of the lighting bracket 26 near the cover rear surface 59c. The remaining one of the three leg portions 29, the leg portion 29 a, is provided on the side of the illumination bracket 26 near the cover front surface 59 b. By arranging the three leg portions 29 in this manner, the poor balance between the image forming unit A and the projection optical unit B by the curved mirror 42 can be eliminated.

  Note that reference numerals 32a3 and 32a4 shown in FIG. 5 are leg portions of the lens holder 32 of the first optical unit 30, and reference numeral 45a3 is a screwing portion 45a3 of the second optical unit 40.

6 is a perspective view of the illumination unit 20, the projection lens unit 31, and the image forming 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. The four corners of the upper surface 26b are provided with through holes through which screws for screwing the first optical unit 30 pass (the through holes 26c1 and 26c2 are shown in FIG. The through hole is not shown). In addition, positioning holes 26e1 and 26e2 for positioning the first optical unit 30 in the illumination unit 20 are provided adjacent to the through holes 26c1 and 26c2 on the front 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 color wheel 21 arrangement side is a main reference for positioning and has a round hole shape. The positioning hole 26e2 on the opposite side is a positioning secondary reference and is a long hole extending in the Z direction. Further, the periphery of each through hole 26c1, 26c2 protrudes from the upper surface 26b of the illumination bracket 26, and serves as a positioning projection 26f for positioning the first optical unit 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 at the opening on the upper surface of the illumination bracket 26, and prevents light from entering the housing-like portion 261 from above.

  Further, between the through holes 26c1 and 26c2 on the upper surface 26b of the illumination bracket 26, as will be described later, the second optical unit 40 is cut out so as not to be an obstacle when screwed to the first optical unit 30. .

  A projection-like light source positioning portion 64a3 (see FIG. 4) provided on the upper surface of the holder 64 of the light source unit 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 figure). 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 an illumination unit. Positioned and fixed to 20 (see FIG. 3).

  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. 7 is a diagram illustrating an optical path L of light within 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 on 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.

Next, the image forming unit 10 will be described.
FIG. 8 is a perspective view of the image forming unit 10.
As shown in FIG. 8, the image forming unit 10 includes a DMD board 11 on which the 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 a 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 penetrates, and the heat sink 13 is formed with a protrusion 13a (see FIG. 7) to be inserted into a through hole (not shown). 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 image forming unit 10 is screwed to the illumination bracket 26 (see FIG. 6), 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. The

  Hereinafter, fixing of the illumination bracket 26 of the image forming unit 10 will be described. First, the DMD 12 positions the image forming unit 10 on the illumination bracket 26 so as to face 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, and the screw is provided in the lighting bracket 26. The image forming unit 10 is fixed to the illumination bracket 26 by screwing into a screw hole provided on the lower surface of the stopper 262 (see FIG. 3). Further, when a screw is screwed into a screwing portion 262 provided on the illumination 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 image forming unit 10 is fixed to the illumination bracket 26, and the three legs 29 shown in FIG. 5 also support the weight of the image forming 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. 2) as indicated by the arrow L2 in FIG. When it is “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. 6 (see arrow L1 in FIG. 7). Therefore, by driving each mirror individually, the projection of light 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.

Next, the first optical unit 30 will be described.
FIG. 9 is a perspective view showing the first optical unit 30 together with the illumination unit 20 and the image forming unit 10.
As shown in FIG. 9, the first optical unit 30 is disposed above the illumination unit 20, and has a projection lens unit 31 holding a first optical system 70 (see FIG. 2) 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. 9. The leg portion 32a1 is shown in FIG. 3 and the leg portion 32a4. 5), 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, the 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.

  The lens holder 32 has screw through holes 32c1 to 32c3 through which screws 48 for screwing the second optical unit 40 to the first optical unit 30 pass (four in FIG. 9). The screw through-holes are illustrated, and the screw through-holes 32c1 to 32c3 each show a state in which the screw 48 is penetrated, and what is visible in the figure is the tip side of the screw portion of the screw 48 .) Further, second optical unit 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. 9).

FIG. 10 is a cross-sectional view taken along the line AA of FIG.
As shown in FIG. 10, the leg portions 32a1 and 32a2 are provided with positioning protrusions 32b1 and 32b2. The right-side positioning protrusion 32b1 in the drawing is a round hole-shaped positioning hole 26e1 that is the main reference for positioning provided on the upper surface 26b of the illumination bracket 26, and the left-side positioning protrusion 32b2 in FIG. Positioning in the Z-axis direction and the X-axis direction is performed by inserting the reference holes into the long hole-shaped positioning holes 26e2, respectively. Then, screws 37 are inserted into the through holes 26c1 to 26c4 provided on the upper surface 26b of the lighting bracket 26, and the screws 37 are screwed into the screw holes provided in the respective leg portions 32a1 to 32a4 of the lens holder 32. One optical unit 30 is positioned and fixed to the illumination unit 20.

  The upper side of the lens holder 32 of the projection lens unit 31 is covered with a mirror holder 45 (see FIG. 12) of the second optical unit described later. As shown in FIG. 3, 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. 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.

Next, the second optical unit 40 will be described.
FIG. 11 is a perspective view showing the second optical system provided in the second optical unit 40 together with the projection lens unit 31, the illumination unit 20, and the image forming unit 10.
As shown in FIG. 11, the second optical unit 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 light can be a spherical surface, a rotationally symmetric aspherical surface, a free curved surface shape, or the like.

FIG. 12 is a perspective view showing the second optical unit 40 together with the first optical unit 30, the illumination unit 20, and the image forming unit 10.
As shown in FIG. 12, the second optical unit 40 transmits the 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 optical unit 40 includes a mirror bracket 43 that holds the folding mirror 41 and the transmission glass 51, a free mirror bracket 44 that holds the curved mirror 42, and a mirror holder 45 to which the mirror bracket 43 and the free mirror bracket 44 are attached. have.

  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, and the inclined part is on the near side in the X direction in the figure from the parallel part. 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 includes an inclined surface 43a that is inclined so as to rise from the front end in the X direction in the drawing, which contacts the inclined portion of the upper opening edge of the mirror holder 45, and the mirror holder 45. And a parallel surface 43b parallel to the X direction that contacts the parallel portion of the edge of the upper opening. 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 back side in the X direction toward the front side in the figure, on the front side and the back side in the Z-axis direction. The free mirror bracket 44 has a connecting portion 44b that connects these two arm portions 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 transmission glass 51 side is pressed against the connecting portion 44b of the free mirror bracket 44 by a leaf spring-like free mirror pressing member 49, and the Z axis direction in the drawing on the first optical system side Both ends are fixed to the arm portion 44a of the free mirror bracket 44 by screws.

  The second optical unit 40 is stacked and fixed on the lens holder 32 of the first optical unit 30. Specifically, a lower surface 451 facing the upper surface of the lens holder 32 is provided at the lower portion of the mirror holder 45, and the lower surface 451 has a cylindrical shape for screwing to the first optical unit 30. Four screwing portions 45a1 to 45a3 are formed (see FIG. 11 for the screwing portions 45a1 and 45a2, see FIG. 5 for the screwing portions 45a3, and the remaining screwing portions are not shown). The second optical unit 40 passes the screws 48 through the screw through holes 32c1 to 32c3 provided in the lens holder 32 of the first optical unit 30, and screws the screws 48 into the screw fixing portions 45a1 to 45a3. The first optical unit 30 is screwed. At this time, the lower surface of the mirror holder 45 of the second optical unit 40 contacts the second optical unit positioning protrusions 32d1 to 32d4 of the lens holder 32, and the second optical unit 40 is positioned and fixed in the Y direction. .

  When the second optical unit 30 is mounted and fixed on the lens holder 32 of the first optical unit 30, the upper part of the projection lens unit 31 above the lens holder 32 is a mirror of the second optical unit 40 as shown in FIG. It is stored in the holder 45. Further, when the second optical unit 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. 9) enters the gap. It becomes a shape.

FIG. 13 is a perspective view showing an optical path from the first optical system 70 to the projection surface 101 (screen).
The light beam that has passed 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 image is incident on the concave curved mirror 42, and is projected and formed on the projection plane 101 by the curved mirror 42 to change the intermediate image into a “further enlarged image”.

  As described above, the projection optical unit 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. 13, the first optical unit 30 and the second optical unit 40 are stacked and fixed on the illumination bracket 26. The image forming 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 optical unit 30, the second optical unit 40 and the image forming unit 10.

FIG. 14 is a schematic diagram showing the arrangement relationship of each unit in the apparatus.
As shown in the figure, the image forming unit 10, the illumination unit 20, the first optical unit 30, and the second optical unit 40 are stacked in the Y direction, which is the minor axis direction of the projection surface. The image forming unit 10, the illumination unit 20, the first optical unit 30, and the second optical unit 40 are arranged in the Z direction, which is the major axis direction of the projection plane, with respect to the stacked body. Thus, in this embodiment, the image forming unit 10, the illumination unit 20, the first optical unit 30, the second optical unit 40, and the light source unit are in a direction parallel to the projected image and the projection plane 101. Arranged side by side in the direction or Z direction. More specifically, with respect to the direction in which the image forming unit A including the image forming unit 10 and the illumination unit 20 and the projection optical unit B including the first optical unit 30 and the second optical unit 40 are stacked. The light source unit 60 is connected to the image forming unit A in the orthogonal direction. 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. .

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

Figure 15 is a diagram showing an example of use of the projector 1 of this embodiment, a diagram showing an example of the use of FIG. 16, a conventional projector 1A, 1 17, projection plane 101 a light source 60 and the lighting unit 20 It is a figure which shows the usage example of the project 1B arranged side by side in the direction orthogonal to.
As shown in FIGS. 15 to 17, when the projector 1 is used in, for example, a conference room, the projector 1 is used by projecting an image onto a projection surface 101 such as a whiteboard by placing the projector 1 on a table 100.

  As shown in FIG. 16, a conventional projector 1 </ b> A is a projection image in which a DMD 12 (image generation element), an illumination unit 20, a first optical system 70, and a second optical system (curved mirror 42) are projected onto a projection plane 101. Are arranged in series in a direction perpendicular to the plane of the. Therefore, the projector 1A becomes longer in the direction orthogonal to the projection plane 101 (X direction), and the projector 1A takes up a space in the direction orthogonal to the projection plane 101. A chair on which a person who views the projection image P projected on the projection plane 101 and a desk to be used are generally arranged in a direction orthogonal to the projection plane 101. If space is taken in the orthogonal direction, the arrangement space of the chair and the arrangement space of the desk are limited, and the convenience is poor.

  In the projector 1B shown in FIG. 17, the DMD 12 (image forming element), the illumination unit 20, and the first optical system 70 are arranged in series in parallel with the plane of the projection image P projected onto the projection plane 101. Therefore, the length in the direction orthogonal to the projection plane 101 can be shortened compared to the projector 1B shown in FIG. However, in the projector 1B shown in FIG. 17, since the light source 61 is arranged in a direction orthogonal to the plane of the projection image with respect to the illumination unit 20, the length in the direction orthogonal to the projection plane 101 of the projector is long. It cannot be shortened sufficiently.

  On the other hand, in the projector 1 of the present embodiment shown in FIG. 15, the image forming unit A composed of the image forming unit 10 and the illumination unit 20 and the projection optical unit B composed of the first optical unit 30 and the folding mirror 41 are provided. The projection plane 101 and the image plane of the projection image projected onto the projection plane 101 are arranged in series in the Y direction in the drawing. In addition, the light source unit 60 and the illumination unit 20 are arranged in series in the Z direction in the drawing in a direction parallel to the plane of the projection image projected on the projection plane 101. That is, in the projector 1 according to the present embodiment, the light source unit 60, the image forming unit 10, the illumination unit 20, the first optical unit 30, and the folding mirror 41 are on the plane of the projection image projected on the projection plane 101. The light source unit 60, the image forming unit 10, the illumination unit 20, the first optical unit 30, and the folding mirror 41 are each projected onto a projection surface. And it arrange | positions so that a plane parallel to the image plane of a projection image may be crossed. Thus, the light source unit 60, the image forming unit 10, the illumination unit 20, the first optical unit 30, and the folding mirror 41 are parallel to the plane of the projection image projected on the projection plane 101 (in the drawing). (Z direction or Y direction), as shown in FIG. 15, the length in the direction orthogonal to the projection plane 101 (X direction in the figure) is shorter than that of the projector shown in FIG. 16 or FIG. can do. Thereby, it can suppress that the projector 1 becomes the obstruction of the arrangement space of a chair and the arrangement space of a desk, and the highly convenient projector 1 can be provided.

  In the present embodiment, as shown in FIG. 14, a power supply unit 80 for supplying power to the light source 61 and the DMD 11 is stacked above the light source unit 60. Thereby, the Z direction of the projector 1 is also shortened.

FIG. 18 is a diagram for explaining another example of use of the projector 1 according to the present embodiment.
As shown in FIG. 18, the projector 1 according to the present embodiment can be used by being suspended from the ceiling 105. Also in this case, since the projector 1 of the present embodiment is short in the direction orthogonal to the projection plane 101, when the projector 1 is installed on the ceiling 105, the projector 1 does not interfere with the lighting fixture 106 arranged on the ceiling 105. Can be installed.

  In the present embodiment, the second optical system is configured by the folding mirror 41 and the curved mirror 42. However, the second optical system may be configured by only the curved mirror 42. The folding mirror 41 may be a plane mirror, a mirror having a positive refractive power, or a mirror having a negative refractive power. In this embodiment, a concave mirror is used as the curved mirror 42, but a convex mirror can also be used. In this case, the first optical system 70 is configured not to form an intermediate image between the first optical system 70 and the curved mirror 42.

  Since the light source 61 reaches the end of its life when used over time, it needs to be periodically replaced. For this reason, in this embodiment, the light source unit 60 is detachably provided from the apparatus main body.

FIG. 19 is a perspective view of the projector 1 as viewed from the installation surface side.
As shown in FIG. 19, the base member 53 constituting the bottom surface of the projector 1 is provided with an opening / closing cover 54, and the opening / closing cover 54 is provided with a rotation operation portion 54 a. When the rotation operation unit 54a is rotated, the fixing of the opening / closing cover 54 and the apparatus main body is released, and the opening / closing cover 54 can be detached from the apparatus main body. A power inlet 56 is provided at a location adjacent to the X direction of the opening / closing cover 54 of the base member 53.

  Further, as shown in FIG. 19, on one YX plane of the exterior cover 59 of the projector 1, an air inlet 84 and an external input unit 88 for inputting image data from an external device such as a personal computer are provided. It has been.

FIG. 20 is a perspective view showing a state in which the opening / closing cover 54 is removed from the apparatus.
When the opening / closing cover 54 is removed, as shown in FIG. 20, the surface of the light source bracket 60 opposite to the side where the light source 61 is mounted is exposed. A handle portion 66 is attached to the light source bracket 62 so as to be rotatable with respect to the light source bracket 62 with O1 indicated by a dotted line in the figure as a rotation center.

  When the light source unit 60 is taken out from the apparatus main body, the light source unit 60 is removed from the opening of the apparatus main body by rotating the handle portion 66 and grasping the handle portion 66 and pulling it out to the front side in the figure. When the light source unit 60 is attached to the apparatus main body, the light source unit 60 is inserted from the opening of the apparatus main body. When the light source unit 60 is inserted into the apparatus main body, the connector 62a shown in FIG. 4 is connected to a power supply side connector (not shown) of the apparatus main body, and the three light source positionings of the holder 64 shown in FIG. The portions 64a1 to 64a3 are fitted into the three light source positioned portions 26a1 to 26a3 provided on the illumination bracket 26 of the illumination unit 20 shown in FIG. 6, and the light source unit 60 is positioned on the apparatus main body. The installation of 60 is completed. Then, the opening / closing cover 54 is attached to the base member 53. In the present embodiment, the light source unit 60 is provided with the portion 66. However, as shown in FIG. 20, a duct portion 65 provided to protrude toward the opening / closing cover 54 may be used as the handle portion.

  Further, the base member 53 is provided with three leg portions 55. By rotating the leg portion 55, the amount of protrusion from the base member 53 is changed, and the height direction (Y direction) is adjusted. Can be done.

  As shown in FIG. 20, an exhaust port 85 is provided on the other YX plane of the exterior cover 59.

FIG. 21 is an explanatory diagram illustrating the flow of air in the projector 1 of the present embodiment. This figure is a diagram of the projector 1 viewed from a direction (X direction) orthogonal to the projection plane 101. In FIG. 27, configurations corresponding to the respective reference numerals in FIG. 21 in the present embodiment are numbered. In FIG. 21 and FIG. 27, the arrows in the drawings indicate the direction of air flow. 28 is a cross-sectional view taken along line AA in FIG. 27, and FIG. 29 is a cross-sectional view taken along line BB in FIG. 30 is a cross-sectional view taken along the line CC of FIG. 30 is a cross-sectional view taken along the line DD of FIG. 30 is a cross-sectional view taken along line EE in FIG.
As shown in FIG. 21, one of the side surfaces of the projector 1 (left side in the drawing) is provided with an intake port 84 that is open for taking outside air into the projector 1, and the other side surface of the projector 1 (right side in the drawing). Is provided with an open exhaust port 85 for exhausting air in the projector 1. An exhaust fan 86 is provided so as to face the exhaust port 85.

  Part of the exhaust port 85 and the intake port 84 is provided so as to be between the light source unit 60 and the operation unit 83 when the projector 1 is viewed from a direction (X direction) orthogonal to the projection plane 101. Yes. Further, a flow path through which air can flow is formed between the back surface of the curved mirror 42 and the exterior cover 59 facing the back surface. As a result, the outside air taken in from the intake port 84 wraps around the ZY plane of the mirror holder 45 of the second optical unit 40 and the back surface of the curved mirror 42 shown in FIG. It moves toward the intake port 85 along the curved surface on the back surface (see FIG. 30). The curved mirror 42 is a concave mirror having a positive power as described above, and the back surface of the curved mirror 42 is a convex shape that roughly follows the shape of the surface. The power supply unit 80 disposed at the upper part of the light source unit 60 has a substantially square U-shape having only a side on the light source unit 60 side when viewed from the Z direction in the figure. Then, the outside air taken in from the intake port 84 is directed to the intake port 85 along the curved surface of the back surface of the mirror holder 45 and the curved mirror 42, and the three directions except for the light source unit 60 side in the four directions are directed to the power supply unit 80. It flows into the enclosed space and is discharged from the exhaust port 85.

  In this way, a part of the exhaust port 85 and the intake port 84 is located between the light source unit 60 and the operation unit 83 when the projector 1 is viewed from a direction (X direction) orthogonal to the projection plane 101. By providing the air flow, it is possible to generate an air flow that passes between the light source unit 60 and the operation unit 83 and is discharged from the exhaust port 85.

  Further, a light source blower 95 is arranged at a location where air around a color motor 21a (see FIG. 5) for rotating the color wheel 21 of the illumination unit 20 can be sucked (see FIG. 28). Thereby, the color motor 21 a and the light tunnel 22 can be cooled by the airflow generated by the intake of the light source blower 95.

  The air sucked by the light source blower 95 passes through the light source duct 96 and flows into the light source air inlet 64b (see FIG. 4) of the holder 64. A part of the air flowing into the light source duct 96 flows between the light source housing 97 and the exterior cover 59 through an opening 96 a formed on the surface of the light source duct 96 facing the exterior cover 59.

  The air flowing between the light source housing 97 and the exterior cover 59 from the opening 96 a of the light source duct 96 is discharged from the exhaust port 85 by the exhaust fan 86 after cooling the light source housing 97 and the exterior cover 59.

  The air that has flowed to the light source inlet 64 b flows into the light source 61, cools the light source 61, and is then exhausted from the light source exhaust port 64 c provided on the upper surface of the holder 64. The air exhausted from the light source exhaust port 64c flows from the opening on the upper surface of the light source housing 97 toward the exhaust port 85 along the fluid guide 87, as shown in FIG. Thereafter, the low-temperature air that has entered the second optical unit 40 and flows into the space surrounded by the power supply unit 80 is mixed with the low-temperature air, and is then discharged from the exhaust port 85 by the exhaust fan 86. As described above, the high-temperature air exhausted from the light source exhaust port 64c is mixed with the outside air and then exhausted, whereby the air exhausted from the exhaust port 85 can be prevented from becoming high temperature. The fluid guide 87 is not always necessary, and even if the fluid guide 87 is not provided, the high-temperature air exhausted from the light source exhaust port 64c is a space surrounded by a main PFC power supply board 80a and a sub PFC power supply board 80b described later. Thus, the air is exhausted from the exhaust port 85 by the air passing from the intake port 84 to the exhaust port 85 through the back surface of the curved mirror 42. However, by using the fluid guide 87, it is possible to suppress the high-temperature air exhausted from the light source exhaust port 64c from going directly to the vicinity of the main PFC power supply board 80a and the sub PFC power supply board 80b. However, if all of the high-temperature air exhausted from the light source exhaust port 64c is avoided from the main PFC power supply board 80a and the sub PFC power supply board 80b by the fluid guide, it is mixed with the air that has passed through the back surface of the phase mirror 42. Since all the high-temperature air is exhausted from the exhaust port 85 without lowering the temperature, the exhaust port 85 is heated. Therefore, the air exhausted from the light source exhaust port 64c and passing through the fluid guide 87 surely passes through the space surrounded by the main PFC power supply board 80a and the sub PFC power supply board 80b more reliably from the intake port 84 to the curved mirror 42. It can be mixed with the air which goes to the exhaust port 85 through the back surface.

  Moreover, it is preferable that the operation unit 83 operated by the user is provided on the upper surface of the apparatus so that the user can easily operate. However, in this embodiment, since the transmissive glass 51 for projecting an image on the projection surface 101 is provided on the upper surface of the projector 1, the operation unit is located at a position overlapping the light source 61 when the projector is viewed from the Y direction. 83 must be provided.

  In the present embodiment, air that has flowed between the light source unit 60 and the operation unit 83 from the air inlet 84 toward the air outlet 85 and that has cooled the light source 61 and has reached a high temperature is exhausted toward the air outlet. Therefore, it is possible to suppress the movement of the high-temperature air to the operation unit 83. Thereby, it is possible to suppress the temperature of the operation unit 83 from rising due to the air heated to a high temperature by cooling the light source 61. Further, a part of the air that flows around the second optical unit 40 from the intake port 84 and flows toward the exhaust port 85 passes just below the operation unit 83 to cool the operation unit 83. This can also suppress the temperature rise of the operation unit 83.

  Further, outside air is taken in from the power supply inlet 56 provided in the base member 53 shown in FIG. A ballast substrate (not shown) for supplying stable power (current) to the light source 61 is arranged behind the light source housing 97 in the X direction in the drawing, and the outside air sucked from the power supply inlet 56 is The ballast substrate is cooled while moving upward between the light source housing 97 and a ballast substrate (not shown). Then, after flowing into a space surrounded by the power supply unit 80 disposed above the ballast substrate, the exhaust fan 86 exhausts the air from the exhaust port 85.

  In the present embodiment, the fan that generates the airflow from the intake port 84 to the exhaust port 85 is provided on the exhaust side as the exhaust fan 86. Therefore, compared with the case where a fan is provided at the intake port, the fan is connected to the inside of the apparatus. The supply amount of air supplied to can be increased. This is because when the fan is provided at the intake port 84, the second optical unit 40 is in the direction of sending out the air of the fan, so that the air volume of the outside air supplied from the fan to the inside of the apparatus is reduced by the second optical unit 40. Resulting in. On the other hand, when a fan is provided on the exhaust port 85 side as the exhaust fan 86, normally there is no object on the exhaust side of the exhaust port 85, so the amount of air discharged from the exhaust fan 86 does not decrease. Therefore, since the same amount of air as the amount of exhaust exhausted from the exhaust fan 86 is taken in from the intake port 84, the supply amount of air supplied from the intake port to the inside of the apparatus may decrease as a result. Absent. Therefore, air can flow from the intake port 84 toward the exhaust port 85 with a predetermined wind pressure, and the heated air rising from the light source 61 is sent to the exhaust port 85 by an air flow from the intake port 84 to the exhaust port 85. Can go well.

  A cooling unit 120 that cools the heat sink 13 of the image forming unit 10, the light source unit 60, the light source bracket 62, and the like is disposed on the lower left side of the apparatus main body. The cooling unit 120 includes an intake blower 91, a vertical duct 92, and a horizontal duct 93.

The intake blower 91 is disposed oppositely below the intake port 84, and sucks outside air from the surface facing the intake port 84 via the intake port 84, and from the surface opposite to the surface facing the intake port. The inside air is sucked and flows into a vertical duct 92 disposed below the suction blower 91. The air flowing into the vertical duct 92 moves downward and is sent to the horizontal duct 93 connected at the lower part of the vertical duct 92.
The heat sink 13 is disposed in the horizontal duct 93, and the air flowing in the horizontal duct 93 contacts the heat sink 13 to take heat away from the heat sink 13, so that the heat sink 13 is cooled by the air flowing in the horizontal duct 93. Is done. The heat sink 13 has a fin structure, and air flows between the fins. By cooling the heat sink 13, the DMD 12 can be efficiently cooled, and the DMD 12 can be prevented from reaching a high temperature. The heat sink 13 is arranged so as not to contact the base member 53 so that the heat of the heat sink 13 is not easily transmitted to the base member 53. In addition, air is configured to flow also in the space between the heat sink 13 and the base member 53.

  As shown in FIG. 32, the base member 53 is provided with a leg receiving portion 15 into which the leg portion 29 is fitted. The leg portion 29 is connected to the base member 53 by fitting the leg portion 29 into the leg receiving portion 15. The leg receiving portion 15 is disposed outside the horizontal duct 93 so as not to obstruct the flow in the horizontal duct 93 and not to receive heat radiated from the heat sink 13. By disposing the leg portion 29 and the leg receiving portion 15 outside the horizontal duct 93, heat radiated from the heat sink 13 is prevented from being transmitted to the image forming portion A and the projection optical portion B through the leg portion 29. Yes. Further, one leg receiving portion 15 is arranged between the horizontal duct 93 and the cover front surface 59b, and two leg receiving portions 15 are arranged on the rear side of the cover with respect to the one leg receiving portion 15. Therefore, the leg portion 29 has one leg portion 29a closest to the cover front surface 59b side with respect to the lighting bracket 26, and two leg portions 29b are arranged on the cover rear surface 59c side from the one leg portion 29a. . The two leg portions 29b are disposed on the illumination bracket 26 at a larger interval than the length of the heat sink 13 in the direction in which the air flows. In this way, a larger number of legs 29 are provided on the cover rear face 59c side than the cover front face 59b side, and the two leg parts 29b are provided at a larger interval than the length of the heat sink 13 in the direction of air flow. The weight of the mirror 42 is supported in a well-balanced manner. Further, as can be seen from the arrangement of the leg receiving portions 15, the straight line connecting one of the leg portions 29 b to the other overlaps the heat sink 13. Since the straight line connecting one leg of the leg portion 29 b overlaps the heat sink 13, the installation area of the projector 1 is reduced. In the present embodiment, the leg portion 29 is provided in the image forming portion A and is fitted to the leg receiving portion 15 formed in the base member 53. However, the leg portion is provided in the base member 53 and the image forming portion A is provided. It may be fitted to the formed leg receiving portion 15.

  The air that has moved through the horizontal duct 93 flows into the duct portion 65 or the opening 65a provided in the light source bracket 62 of the light source unit 60 shown in FIG. The air flowing into the opening 65a flows between the opening / closing cover 54 and the light source bracket 62, and cools the opening / closing cover 54.

  On the other hand, the air that has flowed into the duct portion 65 cools the light source bracket 62, then flows into the portion of the light source 61 opposite to the emission side, and cools the side of the light source 61 opposite to the reflecting surface of the reflector 67. Thus, the reflector 67 of the light source 61 is cooled. Therefore, the air passing through the passage portion 65 takes heat from both the light source bracket 62 and the light source 61. The air that has passed near the reflector 67 passes through the exhaust duct 94 that guides the air from the height of the light source bracket 62 to the height near the lower portion of the exhaust fan 86, and then merges with the air exhausted from the light source exhaust port 64C. The fluid guide 87 is passed to the exhaust port 85. The exhaust fan 86 exhausts the exhaust port 85. The air flowing between the opening / closing cover 54 and the light source bracket 62 through the opening 65 a cools the opening / closing cover 54, moves inside the apparatus, and is discharged from the exhaust port 85 by the exhaust fan 86. .

  FIG. 22 is a perspective view showing the cooling unit 120 together with the illumination unit 20 and the light source unit 60, and the positional relationship among the cooling unit, the illumination unit 20, and the light source unit 60 is as shown in the figure.

  FIG. 23 is a cross-sectional view of FIG. 22, and the air flowing in from the intake blower 91 flows as shown by arrows K0, K1, and K3.

FIG. 24 is a perspective view showing the base member 53, the horizontal duct 93, and the light source bracket 62.
As shown in the drawing, the horizontal duct 93 is fixed to the base member 53 of the projector 1, and a part of the upper surface thereof is opened. The image forming unit is disposed on the horizontal duct 93 so that the heat sink 13 of the image forming unit 10 passes through the opening.

FIG. 25 is a view of the air flow from the horizontal duct 93 to the light source bracket 62 as seen from below, and FIG. 26 is a view as seen from above.
As shown in FIGS. 25 and 26, the air that has moved in the horizontal duct 93 flows into the duct portion 65 or the opening 65 a provided in the light source bracket 62 of the light source unit 60. The air flowing into the opening 65a flows between the opening / closing cover 54 and the light source bracket 62, and cools the opening / closing cover 54.

  As shown in FIG. 22, the horizontal duct 93 is disposed below the illumination unit 20 by the legs 29 that support the weight of the image forming unit 10, the first optical unit 30, and the second optical unit 40 of the illumination unit 20. It can be seen that a space that can be secured can be secured. Thereby, the heat sink 13 which is a heat radiating portion can be disposed in the horizontal duct 93, and the heat sink 13 can be air-cooled. Thereby, DMD12 can be cooled favorably and the temperature rise of DMD12 can be suppressed.

  In the present embodiment, the image forming unit A (illumination bracket 26 of the illumination unit 20) is provided with legs, but for example, the projection optical unit B may be provided with legs, or as a base unit. The base member 53 may be provided with legs. In this case, a plurality of legs extending vertically upward from the base member 53 are provided, and the image forming unit A (illumination unit 20) is stacked and fixed on the upper surfaces of these legs.

  In the present embodiment, as described above, the image forming unit A and the projection optical unit B are supported by the plurality of legs 29, so that the image can be satisfactorily achieved with a simple configuration as compared with the case of supporting by the exterior cover 59. The forming part A and the projection optical part B can be supported. Thereby, compared with the case where the image forming unit A and the projection optical unit B are supported by the exterior cover 59, the apparatus can be made inexpensive.

  Further, in the present embodiment, the projection optical unit B (integrated unit composed of the first optical unit 30 and the second optical unit 40) is added to the image forming unit A (integrated unit of the illumination unit 20 and the image forming unit 10). The image forming unit A and the projection optical unit B are supported by positioning and fixing, and the leg unit supporting the image forming unit A and the leg unit supporting the projection optical unit B. It may be provided separately. In this case, the leg portion that supports the image forming portion A forms the leg portion so as to secure a space in which the heat sink 13 as the heat radiating portion can be disposed between the base member 53 as the base portion and the DMD 12 as the image forming element. . The legs that support the projection optical unit B form legs so that the projection optical unit B is disposed above the image forming unit A.

Further, it is preferable that the weight of the image forming unit A and the projection optical unit B is supported at three or more points, so that the image forming unit A and the projection optical unit B can be stably supported. Further, even two leg portions 29 can support the image forming portion A and the projection optical portion B at three or more points. Specifically, a rod-like leg portion extending to the base member 53 is provided on the front side in the X direction of the lighting unit 20, and a rod-like leg portion and a plate are provided as plate-like leg portions extending to the base member 53 on the far side in the X direction. The image forming part A and the projection optical part B are supported by two of the leg portions. Also in this case, the image forming unit A and the projection optical unit B are supported at three points, that is, the rod-shaped leg portion and at least both end portions that are in contact with the base member of the plate-like leg portion. Thus, the image forming unit A and the projection optical unit B are supported.
Further, as in the present embodiment, the image forming unit A and the projection optical unit B can be stably supported without play as compared with the case of supporting with four or more legs by supporting with three legs. And can be supported.

What was demonstrated above is an example, and there exists an effect peculiar for every following (1)-(6) aspect.
(1)
A light source unit (light source unit 60), an image forming unit (image forming unit A) that forms an image using light from the light source unit, and the image forming unit that dissipates heat from the image forming unit. In an image projection apparatus that includes a heat radiating section (heat sink 13) and projects an image formed by the image forming section, a first member (base) that faces the installation surface in order to install the apparatus main body on the installation surface A member 53) and a leg 29 on the opposite side of the installation surface of the first member and holding the image forming portion with a space between the first member, The leg portion holds the image forming portion so that the heat dissipating portion is located in the space and does not contact the first member.
With this configuration, the heat sink 13 can be disposed between the image forming portion A and the base member 53 so as not to contact the base member 53 as described in the embodiment. Further, the weight of the image forming portion A is received by the base member 53 via the leg portion 29, and the required strength is reduced as compared with the case where the weight is received by the cover front surface 59b or the cover rear surface 59c.
In addition, compared to a configuration in which the image forming unit is fixed to a surface perpendicular to the installation surface, a heat radiating unit is disposed between the image forming unit and the facing member without considering the strength of the surface perpendicular to the installation surface. It becomes possible.

(2)
In the image projection device according to the aspect described in (1) above, a flow path (horizontal duct 93) for guiding air from the heat radiating section to the light source section is provided, and the heat radiating section is in contact with air flowing in the flow path. The legs are arranged so as not to contact the air flowing in the flow path.
By providing such a configuration, there is no possibility that the leg portion 29 receives the heat radiated by the heat sink 13 and is transmitted to the image forming portion A.

(3)
The image projection apparatus according to the aspect described in (1) or (2) above includes a projection optical unit (projection optical unit B) that forms a projection image of the image formed by the image forming unit, and is provided on the installation surface side. The heat radiating unit, the image forming unit, and the projection optical unit are arranged in this order, and the image forming unit and the projection optical unit are supported by the leg unit 29.
Thereby, the strength required for the cover front surface 59b or the cover rear surface 59c is further reduced.

(4)
In the image projection apparatus according to the aspect described in (3) above, the projection optical unit is positioned and fixed to the image forming unit, and the leg portion 29 is provided in the image forming unit.
With this configuration, the leg portion 29 can support the image forming unit and the projection optical unit.

(5)
Further, in the image projection apparatus according to any one of the above aspects (1) to (4), air blowing means (intake air) that sends air to the flow path to generate an air flow from the heat radiating portion toward the light source portion. A blower 91) was provided.
By providing such a configuration, it is possible to generate an air flow in the flow path, to suppress a temperature rise of a heat radiating portion such as the heat sink 13, and to cool an image generating element such as the DMD 12 well. it can.

(6)
Further, in the image projection apparatus according to any one of the above (1) to (5), the projection optical unit A is disposed above the image forming unit B, and the light source 61 and the image forming unit A are arranged in the projected image. They are arranged side by side in a direction parallel to the plane, and are arranged side by side in a direction parallel to the plane of the projection image projected onto the projection plane.
With this configuration, the length in the direction orthogonal to the plane of the projection image projected on the projection plane of the apparatus can be shortened. Thereby, it can suppress that the installation space of an apparatus is taken in the direction orthogonal to the surface of a projection image. 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 addition, when the image projection device is suspended from a ceiling or the like, when the image projection device is installed on the ceiling, it can be prevented from interfering with a lighting fixture or the like placed on the ceiling, and can be placed at a predetermined position. An image projection device can be installed. Thereby, a highly convenient image projection apparatus can be provided.

1: Projector 10: Image generation unit 11a: Socket 11: DMD board 12: DMD
13: Heat sink 14: Fixing member 15: Leg receiving part 20: Illumination unit 21: Color wheel 22: Light tunnel 23: Relay lens 24: Cylinder mirror 25: Concave mirror 26: Illumination brackets 26a1 to 26a3: Light source positioning part 26c1 26c4: Through hole 26d: Irradiation through holes 26e1, 26e2: Positioning hole 26f: Positioning projection 27: OFF light plate 28: Illumination cover 29: Leg part 29a: Leg part 29b near the front face of the cover: Leg part 30 near the rear face of the cover: First optical unit 31: Projection lens unit 32: Lens holders 32a1 to 32a4: Leg portions 32b1 to 32b4: Positioned protrusions 32c1 to 32c4: Screw through holes 32d1 to 32d4: Second optical unit positioning protrusions 33: Focus lever 34: Lever gear 35: Idler gear 3 6: Focus gear 40: Second optical unit 41: Folding mirror 42: Curved mirror 43: Mirror bracket 44: Free mirror bracket 45: Mirror holders 45a1 to 45a4: Screw fixing portion 46: Mirror pressing member 47: Glass pressing member 49: Free mirror pressing member 51: Transmission glass 53: Base member 53c: Light source unit outlet 53d: Notch 53e: Hooked portion 54: Opening / closing cover 54a: Rotating operation unit 59: Exterior cover 59a: Cover upper surface 59b: Cover front surface 59c: Cover rear surface 59d: Cover side surface 60: Light source unit 61: Light source 62: Light source bracket 62a: Connector portion 64: Holders 64a1 to 64a3: Light source positioning portion 64b: Inlet 64c: Exhaust port 65: Duct portion 65a: Opening 70: No. 1 optical system 80: power supply unit 3: Operation unit 84: Intake port 85: Exhaust port 86: Exhaust fan 91: Intake blower 92: Vertical duct 93: Horizontal duct 94: Exhaust duct 95: Light source blower 96: Light source duct 100: Table 101: Projection plane 105: Ceiling 106: Lighting fixture A: Image forming unit B: Projection optical unit

JP 2008-134432 A

Claims (3)

An image projection apparatus comprising: an image forming unit that forms an image using light from a light source ; and a structure including a projection optical unit that projects an image formed by the image forming unit.
An opposing portion that faces an installation surface on which the apparatus main body is installed, and a support that installs the structure on the opposing portion so that the structure is in order of the image forming unit and the projection optical unit from the opposing portion side. With
The projection optical unit projects on a plane perpendicular to the installation surface,
A first air flow path provided between the image forming portion and the facing portion;
A fan for blowing air into the first air flow path;
A second air flow path that is provided between the light source and the facing portion and into which air flows from the first air flow path, and the light source is caused by the air flowing into the second air flow path. An image projection apparatus characterized by cooling. The image projector according to claim 1,
The image projection apparatus according to claim 1, wherein the support portion is a leg portion. The image projection apparatus according to claim 2,
The projection optical unit includes a curved mirror whose reflecting surface faces the projection surface,
An image projection apparatus, wherein more legs are arranged on the side farther from the projection surface than on the side closer to the projection surface.

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