WO2016152035A1

WO2016152035A1 - Projection optical device and projector

Info

Publication number: WO2016152035A1
Application number: PCT/JP2016/001090
Authority: WO
Inventors: 直人竹花; 伸行大月; 哲小松
Original assignee: セイコーエプソン株式会社
Priority date: 2015-03-25
Filing date: 2016-03-01
Publication date: 2016-09-29

Abstract

Provided are a projection optical device that prevents dust from flowing into the inside of a projection optics housing through a gap between a light transmission plate and the projection optics housing, and a projector equipped with the projection optical device. A projection optical device 5 including a dioptric system and a catoptric system is provided with a projection optics housing 51, and a light transmission plate 56 for transmitting projection light. The projection optics housing 51 is provided with a light transmission plate holding unit 55 (an opening 551 for allowing projection light to pass therethrough, and a holder 552 for holding the light transmission plate 56). A flexible intervening member 57 (first intervening member 571, and second intervening member 572) is placed between the light transmission plate 56 and the holder 552, dividing the holder 552 to cover the entire circumference thereof. The first intervening member 571 is placed on the holder 552 or on the sides 562 of the light transmission plate 56, and the second intervening member 572 is placed on the outer peripheral end surface 561 of the light transmission plate 56. The intervening member 57 is held on the light transmission plate holding unit 55 while being pressed on by the light transmission plate 56.

Description

Projection optical device and projector

The present invention relates to a projection optical apparatus and a projector including the projection optical apparatus.

2. Description of the Related Art Conventionally, there is known a projector that modulates light emitted from a light source (emitted light) with a light modulation device according to image information and enlarges and projects it with a projection optical device. Some projectors project on a projection surface such as a screen with a wide angle of view from a short distance. In such a projector, a short-focus projection optical apparatus is used as a projection optical apparatus capable of projecting at a short distance and a wide angle of view. In recent years, a refraction / reflection composite optical system is used together with a refraction optical system as a projection optical system for achieving a wide angle of view at a short distance.

Projection optical devices usually have a projection optical housing that houses a refraction / reflection composite optical system. Further, the projection optical casing is accommodated in, for example, an exterior casing of a projector. The projection optical housing is provided with a translucent plate that transmits light reflected from the reflection optical system from the projection optical housing toward the screen. Further, the light transmitted through the light transmissive plate is emitted from an opening provided in the exterior casing of the projector and formed corresponding to the light transmissive plate.

Also, the projector has a cooling mechanism inside the exterior housing. Then, the cooling mechanism drives a cooling fan that constitutes the cooling mechanism to allow the outside air to flow into the exterior casing, and blows the flowing outside air onto the optical component that generates heat as cooling air to cool it. The projector is provided with a filter for the purpose of removing dust contained in the outside air when the outside air flows into the exterior housing.

Patent Document 1 discloses an inexpensive and compact mirror-type projection optical system in which a small mirror is mounted and a good image can be obtained without impairing the wide-angle property.

JP 2012-203139 A

• If dust continues to adhere to the filter provided in the projector, the filter is likely to be clogged. When the filter is clogged, by driving the cooling fan, the outside air flows into the exterior casing through the gaps between the constituent members constituting the projector. In such a case, dust will flow directly into the exterior housing.

The projection optical device housed in the outer casing is no exception, and dust is projected through the opening between the outer casing and the gap between the translucent plate and the projection optical casing where the translucent plate is installed. Flows into the housing. When dust flows into the projection optical housing, the dust adheres to the surfaces of various lenses constituting the optical system. When an image is projected in a state where dust adheres to the surfaces of various lenses, the dust is projected as a shadow on a screen or the like. Thereby, there is a problem that the quality of the projected image is deteriorated.

Accordingly, there has been a demand for a projection optical device that suppresses the inflow of dust into the projection optical housing through the gap between the light transmitting plate and the projection optical housing, and a projector equipped with the projection optical device.

The present invention has been made to solve at least a part of the problems described above, and can be realized as the following forms or application examples.

Application Example 1 A projection optical apparatus according to this application example is a projection optical apparatus including a refractive optical system having a plurality of lenses and a reflective optical system having a reflecting mirror, and includes the refractive optical system and the reflective optical system. A projection optical housing to be housed, and a translucent plate that is installed in the projection optical housing and transmits the projection light emitted from the reflective optical system, and the projection optical housing holds the translucent plate A translucent plate holding unit, the translucent plate holding unit including an opening that allows projection light to pass therethrough, and a holding unit that is formed along the opening to install the translucent plate, and the translucent plate and the holding unit The intermediate member is provided with elasticity between the first intermediate member and the second intermediate member. The intermediate member divides the holding portion and covers the entire circumference. The 1 intervening member is installed on the side of the holding part or the translucent plate, and the second interposing member is installed on the outer peripheral end surface of the translucent plate Is, the transparent plate is characterized in that by pressing is held in transparent plate holding portion of the first intervening member and the second intermediate member relative to the holding portion.

According to such a projection optical apparatus, it has the 1st interposition member and 2nd interposition member which cover the perimeter in the form which divides | segments a holding | maintenance part, and a translucent board is 1st interposition member and 2nd. The interposition member is pressed against the holding portion and held by the translucent plate holding portion. As a result, the gap between the translucent plate and the projection optical housing (translucent plate holding portion) can be closed by the interposition member, so that the inflow of dust into the projection optical housing can be suppressed. .
In addition, since the first interposition member is installed on the holding portion or the side of the translucent plate and the second interposition member is installed on the outer peripheral end surface of the translucent plate, for example, the translucent plate holding portion It is possible to cope with the case where the interposition member cannot be uniformly installed in the holding portion, such as when the holding portion is not formed uniformly or when the holding portion is formed in an irregular shape.

Application Example 2 In the projection optical apparatus according to the application example described above, the translucent plate is formed in a rectangular shape, and the outer peripheral end surface is inserted into the holding portion corresponding to the outer peripheral end surface on one side of the translucent plate. The second interposition member is installed on the outer peripheral end surface on one side, and the first interposition member is a side part on the other three sides of the translucent plate, or a holding part corresponding to the side part It is preferable that it is installed in.

According to such a projection optical apparatus, when the translucent plate is formed in a rectangular shape and the holding portion corresponding to the outer peripheral end surface on one side of the translucent plate is provided with the insertion portion, the outer peripheral end surface on one side of the translucent plate A second interposed member is installed in Thereby, when inserting a translucent board into an insertion part, even if it inserts the outer peripheral end face of one side of a translucent board, the 2nd interposition member can be inserted without peeling, and the 2nd interposition member can be inserted. The holding part can be pressed. In addition, the first interposition member is installed on the other three sides of the translucent plate or the holding unit corresponding to the side, so that even when the translucent plate is inserted into the insertion unit, One interposition member and the second interposition member can be pressed. Thereby, the clearance gap between a translucent board and a holding | maintenance part can be block | closed, and the inflow of dust to the inside of the housing for projection optics can be suppressed.

Application Example 3 In the projection optical apparatus according to the application example described above, the translucent plate is formed in a rectangular shape, and includes a pressing member that presses one of the side portions where the first interposition member of the translucent plate is disposed. The translucent plate is preferably held by the translucent plate holding part by the pressing member.

According to such a projection optical apparatus, one of the side portions of the translucent plate where the first interposed member is disposed is pressed by the pressing member. Thereby, a translucent board is stably hold | maintained at the translucent board holding | maintenance part in the state which pressed the interposition member.

Application Example 4 In the projection optical apparatus according to the application example described above, it is preferable that the first interposed member and the second interposed member are made of cushion members.

According to such a projection optical apparatus, the first interposed member and the second interposed member can be simply configured by configuring the first interposed member and the second interposed member as cushion members. it can.

Application Example 5 A projector according to this application example projects a light source device that emits light, a light modulation device that modulates light according to image information, and a modulated light modulated by the light modulation device. The projection optical device according to any one of the above, and a light source device, a light modulation device, and an exterior housing that houses the projection optical device and constitutes an exterior, and the exterior housing is an opening of the projection optical housing Corresponding to the above, an opening that allows the projection light that has passed through the opening to pass therethrough is provided.

According to such a projector, since the projection optical device that can suppress the inflow of dust into the projection optical housing through the gap between the translucent plate and the projection optical housing is provided, The quality of the projected image can be improved.

FIG. 3 is a perspective view showing a usage pattern of the projector according to the embodiment. The figure which shows typically the optical unit of a projector. The perspective view of a projection optical apparatus. 1 is a schematic sectional view of a projection optical device. The disassembled perspective view of a translucent board holding | maintenance part, a translucent board, and an interposition member. FIG. 3 is a schematic cross-sectional view of a state where a light transmissive plate is held by a holding unit. The perspective view which shows the upper housing | casing of a modification. The top view which looked at the upper side housing | casing in which the translucent board in a modification was arrange | positioned from the translucent board side.

Hereinafter, embodiments will be described with reference to the drawings.

[Embodiment]

[Usage and operation of projector 1]
FIG. 1 is a perspective view showing a usage pattern of the projector 1 according to the present embodiment. Note that the projector 1 includes a projection optical device 5 according to the present embodiment inside an exterior housing 10 of the projector 1.

As shown in FIG. 1, the projector 1 according to the present embodiment is supported and installed on a support device SD installed on a wall surface W such that the bottom surface 1A is on the upper side and the upper surface 1B is on the lower side. Further, the screen SC as a projection surface is installed at a position close to the projector 1 below the wall surface W where the projector 1 is installed.

The projector 1 modulates the emitted light emitted from the light source device 31 by a liquid crystal panel 351 as a light modulation device according to image information, and uses the modulated light as image light to project the projection optical device 5 (both see FIG. 2). This is an apparatus for enlarging and projecting through the projector. Note that the projector 1 projects the image light (projection light) reflected by the reflection optical system (reflection mirror 71 (see FIG. 2 and subsequent figures)) of the projection optical device 5 onto the screen SC from the opposite side of the bottom surface 1A. The projector 1 of the present embodiment is configured as a so-called short focus type projector that projects a large screen (wide angle of view) from a short distance to the screen SC.

[Configuration and operation of the optical unit 3 of the projector 1]
FIG. 2 is a diagram schematically showing the optical unit 3 of the projector 1. The optical unit 3 operates based on control by a control unit (not shown), and forms image light according to image information. As shown in FIG. 2, the optical unit 3 includes a light source device 31 having a light source lamp 311 and a reflector 312, an illumination optical device having

lens arrays

321 and 322, a polarization conversion element 323, a superimposing lens 324, and a collimating lens 325. 32. The optical unit 3 includes a color separation optical device 33 having

dichroic mirrors

331 and 332 and a reflection mirror 333, and an incident side lens 341, a relay lens 343, and a relay optical device 34 having reflection mirrors 342 and 344. ing.

Further, the optical unit 3 includes three liquid crystal panels 351 (red light (R light) liquid crystal panel 351R, green light (G light) liquid crystal panel 351G, blue light (B light)) as light modulation devices. The electro-optical device 35 includes three incident-side polarizing plates 352, three emitting-side polarizing plates 353, and a cross dichroic prism 354 as a color synthesizing optical device. The optical unit 3 also includes a projection optical device 5 and an optical component housing 36 that houses the optical devices 31 to 35.

The optical unit 3 separates light emitted from the light source device 31 and passing through the illumination optical device 32 into three color lights of R light, G light, and B light by the color separation optical device 33 with the above-described configuration. Each separated color light is modulated by each liquid crystal panel 351 according to image information, and formed as modulated light for each color light. The modulated light for each color light enters the cross dichroic prism 354, is synthesized as image light, and is enlarged and projected onto the screen SC (FIG. 1) or the like via the projection optical device 5. Note that the optical devices 31 to 35 described above are used as optical systems of various general projectors, and thus detailed description thereof is omitted.

[Outline of Projection Optical Device 5]
FIG. 3 is a perspective view of the projection optical device 5. FIG. 4 is a schematic sectional view of the projection optical device 5. FIG. 3 is a perspective view of the projection optical device 5 as viewed from the upper rear side. FIG. 4 is a cross-sectional view of the projection optical device 5 on a plane passing through the optical axis C and extending in the vertical direction. With reference to FIGS. 3 and 4, the projection optical apparatus 5 will be schematically described including the configuration and operation of each member constituting the projection optical apparatus 5. In FIG. 4, the illustration of the interposed member 57 is omitted.

In FIG. 3 and subsequent figures, for convenience of explanation, the incident side on which the image light is incident on the refractive optical system (first optical system 6) of the projection optical apparatus 5 is the rear side, and the image light is emitted from the first optical system 6. The injection side is the front side. Also, in the diagram shown in FIG. 3, the upper direction of the paper is the upper side and the lower direction is the lower side. Further, the left and right directions when viewed along the emission side from which the image light is emitted from the first optical system 6 are appropriately used as the left side and the right side. Therefore, in the state of use shown in FIG. 1, the projection optical device 5 is installed in a state where the top, bottom, left and right are reversed. This is a state where the projector 1 is turned upside down.

As shown in FIGS. 3 and 4, the projection optical device 5 is configured as an optical system that combines a first optical system 6 (refractive optical system) and a second optical system 7 (reflection optical system) as a projection optical system. Has been. In the projection optical apparatus 5 of the present embodiment, the image light emitted from the cross dichroic prism 354 is refracted by the first optical system 6 and reflected by the second optical system 7 constituted by the reflection mirror 71 to the screen SC. Project. The projection optical device 5 includes, as the first optical system 6, a plurality of lens groups having one or a plurality of lenses as one lens group, and these lens groups are arranged along the optical axis C. . Note that the projection optical apparatus 5 of the present embodiment is configured as a short focus projection optical apparatus, and the first optical system 6 has a function of adjusting the focus of incident image light.

The projection optical device 5 includes a projection optical housing 51 serving as a base of the device, a first optical system 6 and a second optical system 7 housed in the projection optical housing 51, and reflection reflected by the reflection mirror 71. A light transmission plate 56 that transmits light (projection light) is schematically configured. The projection optical housing 51 includes a lower housing 52 that houses the first optical system 6 and the second optical system 7, and an upper housing that covers the upper portion of the lower housing 52 and holds the light transmitting plate 56. And a body 53.

The first optical system 6 includes a guide cylinder 65, a cam cylinder 66, and a first lens group L1 to a fourth lens group L4 arranged in order from the front side along the optical axis C, and a corresponding lens group L1 to L4. The first lens frame 61 to the fourth lens frame 64 to be held are provided. The second optical system 7 includes an aspheric reflecting mirror 71.

The projection optical device 5 optically processes the image light incident from the fourth lens group L4 by the first optical system 6, and then emits the light from the first lens group L1 to the reflection mirror 71 of the second optical system 7, The emitted image light is reflected by the reflecting mirror 71 and emitted as projection light upward in the first lens unit L1. The first lens unit L1 is the foremost stage of the first optical system 6 that emits light to the reflection mirror 71.

[General configuration of lower casing 52]
The lower housing 52 of the projection optical housing 51 extends to the flange 521 disposed at the incident side end, the first housing portion 522 extending from the flange 521 to the front side, and the first housing portion 522. And a second housing portion 523 that expands to the front side. The flange 521 is formed in a rectangular shape in plan view, and the electro-optical device 35 is fixed to the rear end surface. In addition, a rear side of the fourth lens frame 64 that has an insertion hole 5211 and holds the fourth lens unit L4 is inserted in the center portion of the flange 521.

The first accommodating portion 522 is substantially cylindrical and is formed in a substantially semi-cylindrical shape with the upper side cut off from the central axis, and the first optical system 6 is accommodated therein. A fixing portion 5221 for fixing the projection optical device 5 to a fixing member (not shown) inside the projector 1 is formed on the front side and the rear side of the upper end portion of the first housing portion 522.

The second storage portion 523 is a cylindrical shape that expands to the front side, and is formed in a generally semi-cylindrical shape (half-conical truncated cone shape) with the upper side cut off from the central axis. The front side end 5231 of the second accommodating portion 523 is opened, and the reflection mirror 71 is installed on the inner surface near the front side end 5231.

[General configuration of upper casing 53]
The upper housing 53 of the projection optical housing 51 is installed on the upper portion of the lower housing 52 so as to cover from the front end portion 5231 of the second housing portion 523 to the middle of the front side of the first housing portion 522. . Further, the upper casing 53 has an angle substantially perpendicular to the projection optical axis, which is a line connecting the centers of the projection light beams, with a rectangular transparent translucent plate 56 that transmits the projection light reflected by the reflection mirror 71. The light transmitting plate holding portion 55 and the inclined portion 54 formed at an angle that does not block the projection light transmitted through the light transmitting plate 56 are generally configured.

The upper casing 53 is fixed to the upper end of the lower casing 52 with screws SC1. Note that by fixing the upper housing 53 to the lower housing 52, leakage of light emitted from the first optical system 6 and the second optical system 7 to the outside can be prevented. In addition, by fixing the upper casing 53 to the lower casing 52, the engaging area between the upper casing 53 and the lower casing 52 is fixed in contact with each other. We suppress as much as possible. For this reason, dust and the like are prevented from entering the projection optical casing 51.

In the present embodiment, the projection optical device 5 is installed inside the exterior casing 10 that constitutes the exterior of the projector 1. As shown in FIG. 4, the upper surface 1 B of the projector 1 (exterior housing 10) is transmitted through the light transmitting plate 56 corresponding to the outer shape of the light transmitting plate 56 (the opening 551 of the light transmitting plate holding portion 55). An opening 11 through which the projection light that has passed through the opening 551 passes is formed.

[Configuration and Operation of Optical System of Projection Optical Apparatus 5]
The guide tube 65 is formed with a rectilinear groove 6521 cut out along the direction of the optical axis C from the front side toward the rear side. The guide tube 65 covers the outer peripheral sides of the first lens frame 61 and the second lens frame 62. The guide tube 65 is fixed to the inside of the lower housing 52 with screws.

The cam cylinder 66 is formed in a cylindrical shape, and a part of the guide cylinder 65 is inserted inside the cam cylinder 66 so that the cam cylinder 66 can rotate around the optical axis C with respect to the guide cylinder 65. The cam cylinder 66 is formed on the inner peripheral surface with a guide groove (not shown) cut out along the direction of the optical axis C from the front end portion toward the rear side, and a predetermined path.

Cam grooves

663, 664, and 665 for defining the moving operation of L1 to third lens unit L3 are formed.

A fixing portion (not shown) for fixing a lever member (not shown) is formed on the outer peripheral surface of the cam cylinder 66. When performing the focus adjustment, the cam cylinder 66 is rotated relative to the guide cylinder 65 by rotating the lever member.

As shown in FIG. 4, the first lens group L1, the second lens group L2, and the third lens group L3 are held by a first lens frame 61, a second lens frame 62, and a third lens frame 63, respectively, for guidance. It is inserted into the cylinder 65 and configured to be movable along the optical axis C. Cam pins 61P, 62P, and 63P are formed on the lens frames 61, 62, and 63, and these cam pins 61P, 62P, and 63P are a straight advance groove 6521 of the guide cylinder 65 and

cam grooves

663 and 664 of the cam cylinder 66, respectively. , 665 is engaged.

The lens frames 61, 62, and 63 are arranged along the optical axis C direction by the cam pins 61 P, 62 P, and 63 P being guided to intersections of the rectilinear grooves 6521 and the

cam grooves

663, 664, and 665 by the rotation of the cam cylinder 66. Move. As a result of this movement, the lens groups L1, L2, and L3 are moved, thereby adjusting the focus of the image light.
The fourth lens unit L4 is held by the fourth lens frame 64 and is fitted into the guide tube 65. The fourth lens unit L4 is rotated with respect to the guide tube 65 to perform back focus adjustment, and is fixed to the guide tube 65 after the adjustment.

FIG. 5 is an exploded perspective view of the translucent plate holding part 55, the translucent plate 56, and the interposition member 57. With reference to FIGS. 3 to 5, the configuration, assembly, and function of the translucent plate holding portion 55, the translucent plate 56, the interposition member 57, and the like will be described.

[Configuration of Translucent Plate 56]
The translucent plate 56 is a member that transmits the image light reflected by the reflection mirror 71 from the projection optical device 5 to the outside. In the present embodiment, since the opening 11 (see FIG. 4) of the exterior housing 10 that houses the projection optical device 5 is configured to be opened, the light transmitting plate 56 functions as an exterior. And exposed to the outside. In this embodiment, the light transmitting plate 56 is made of a transparent glass member. Moreover, the translucent plate 56 is formed in a rectangular shape.

Hereinafter, for convenience of explanation, the outer

peripheral end surfaces

561a, 561b, 561c, and 561d are clockwise from the upper side with respect to the outer peripheral end surfaces 561 of the four sides of the translucent plate 56. In addition, a region in the vicinity of the outer peripheral end surface 561 on the four sides of the translucent plate 56 is defined as a side portion 562, and is defined as

side portions

562a, 562b, 562c, and 562d in a clockwise direction from the upper side.

[Configuration of Translucent Plate Holding Section 55]
The translucent plate holding unit 55 is a component that holds and fixes the translucent plate 56 to a holding unit 552 described later. The translucent plate holding part 55 is configured according to the outer shape of the translucent plate 56. As shown in FIG. 5, the translucent plate holder 55 includes a rectangular opening 551 that allows projection light to pass therethrough. The translucent plate holding unit 55 includes a holding unit 552 that is formed along the opening 551 and holds the translucent plate 56. The holding portion 552 includes a holding surface portion 553 formed by a uniform surface having substantially the same width on all four sides, and a wall portion 554 protruding upward from the holding surface portion 553 along the rectangular opening portion 551. Yes.

Hereinafter, for convenience of explanation, the holding surface portions 553 are set to the holding

surface portions

553a, 553b, 553c, and 553d clockwise from the upper side. Further, the

wall portions

554a, 554b, 554c, and 554d are clockwise from the upper side with respect to the wall portion 554.

An upper holding portion 555 that protrudes from the top surface of the wall portion 554c and extends toward the opening portion 551 is formed in the lower wall portion 554c that is one side of the wall portion 554. In addition, an insertion part is comprised by the area | region enclosed by the upper side holding | maintenance part 555, the holding surface part 553c, and the wall part 554c. The outer peripheral end surface 561c of the translucent plate 56 is inserted into the insertion portion. Fixed portions 558 are formed at both ends of the upper wall portion 554a facing the one-side wall portion 554c.

[Configuration of Fixing Unit 558]
The fixing unit 558 is a component that fixes the light transmitting plate 56 installed in the holding unit 552 using a fixing plate 58 described later. The fixing portion 558 has a mounting surface 5581 on which the fixing plate 58 is mounted and a screw hole 5582 in the center. Further, dowels 5583 for positioning the fixing plate 58 are formed on both sides of the screw hole 5582.

[Configuration of Fixing Plate 58]
The fixing plate 58 as a pressing member is a member that is installed on the fixing portion 558 and presses the translucent plate 56 to fix it to the holding portion 552. The fixed plate 58 is formed in a rectangular shape using a metal plate member. One end surface 581 of the fixing plate 58 is bent in accordance with the inclination angle of the holding portion 552. The fixing plate 58 has a hole 582 through which the screw SC 2 is inserted at a substantially central portion, and positioning holes 583 are formed on both sides of the hole 582.

[Configuration of Interposition Member 57]
In the present embodiment, an interposition member 57 is installed between the translucent plate 56 and the holding portion 552. The interposition member 57 has a function of compressing in the pressing direction when pressed against a gap generated when the translucent plate 56 is installed in the holding portion 552 and closing the gap.

In the present embodiment, the interposed member 57 includes a first interposed member 571 and a second interposed member 572. And the interposition member 57 is formed in the state which covers the perimeter by the form which divides the holding | maintenance part 552 with the 1st interposition member 571 and the 2nd interposition member 572. In this embodiment, the 1st interposition member 571 and the 2nd interposition member 572 are comprised by the cushion member which has elasticity. Specifically, the first interposed member 571 and the second interposed member 572 use a polyethylene resin foam having a three-dimensional network structure as a cushion member. The cushion member is not limited to this, and a urethane sponge having a three-dimensional network structure may be used. Further, an elastic rubber member may be used.

As shown in FIG. 5, the first interposed member 571 is installed on the holding

surface portions

553 a, 553 b, and 553 d on the three sides of the holding surface portion 553. The first interposed member 571 is formed in a frame shape corresponding to the shape of the holding surface portion 553 on the three sides, and is formed in a plate shape in which the lower side is cut out. An adhesive is installed on the lower surface of the first interposed member 571. In this embodiment, as the pressure-sensitive adhesive, a so-called double-sided tape (not shown) in which an adhesive is applied to both sides of the tape is used.

The 2nd interposition member 572 is installed in the outer peripheral end surface 561c by the side of the translucent board 56, as shown in FIG. The second interposed member 572 is formed in a rectangular plate shape corresponding to the shape of the outer peripheral end surface 561c. Note that the above-described double-sided tape (not shown) is attached to one end face of the second interposed member 572.

[Installation of Interposition Member 57]
As described above, the first interposed member 571 is installed (attached) from above on the holding

surface portions

553a, 553b, and 553d on the three sides of the holding surface portion 553. In other words, the first interposed member 571 is attached to the holding portions 552 (holding

surface portions

553a, 553b, 553d) corresponding to the

side portions

562a, 562b, 562d on the three sides of the translucent plate 56. Moreover, the 2nd interposition member 572 is installed (adhered) to the outer peripheral end surface 561c of the one side of the translucent board 56 as mentioned above.

[Installation of Translucent Plate 56 to Holding Portion 552]
First, the translucent plate 56 is inserted into the insertion portion (a region surrounded by the upper holding portion 555, the holding surface portion 553c, and the wall portion 554c) from obliquely above. Specifically, the outer peripheral end surface 561c side of the translucent plate 56 to which the second interposed member 572 is attached is inserted into the insertion portion. Then, the second interposed member 572 is brought into contact with the wall portion 554c facing in the insertion direction and further inserted, thereby pressing the second interposed member 572 and compressing it toward the wall portion 554c. Then, the translucent plate 56 in the inserted state is installed (tilted) on the holding

surface portions

553a, 553b, and 553d that are inside the

wall portions

554a, 554b, and 554d on the three sides. Thereby, the side part 562c of the inserted translucent board 56 is controlled to move upward.

After the translucent plate 56 is installed on the holding

surfaces

553a, 553b, and 553d on the three sides, the two fixing plates 58 are installed on the fixing unit 558, respectively. Specifically, the fixing plate 58 is positioned by placing the hole 583 into the dowel 5583 of the fixing portion 558 with the end surface 581 of the fixing plate 58 facing the opening 551, and the fixing plate 58 is mounted on the mounting surface 5581. Next, the screw SC2 is inserted from above into the hole 582 of the fixing plate 58 and screwed into the screw hole 5582 of the fixing portion 558. Thereby, the translucent plate 56 is pressed by the fixed plate 58 and moves to the holding surface portion 553 side. When the translucent plate 56 moves to the holding surface portion 553 side, the first interposed member 571 adhered to the holding

surface portions

553a, 553b, and 553d is pressed and compressed to the holding surface portion 553 side.

FIG. 6 is a schematic cross-sectional view of the state in which the translucent plate 56 is held by the holding portion 552, and is a cross-sectional view seen from the left side.

[Gap in the state where the light transmitting plate 56 is held by the holding portion 552]
As shown in FIG. 6, in a state where the translucent plate 56 is held by the holding portion 552 and is fixed to the holding portion 552 by the fixing plate 58 and the upper holding portion 555 (insertion portion), the first interposed member 571 is made transparent. By the pressing of the optical plate 56, the holding

surface portions

553a, 553b, and 553d are compressed. As a result, the gaps between the translucent plate 56 (specifically, the

side portions

562a, 562b, and 562d on the back surface side) and the holding

surface portions

553a, 553b, and 553d are closed by the first interposed member 571. .

Further, the second interposed member 572 is compressed to the wall portion 554c side by pressing of the light transmitting plate 56. Thereby, the clearance gap between the translucent board 56 (specifically outer peripheral end surface 561c) and the wall part 554c will be in the state closed by the 2nd interposition member 572.

Note that, at both end portions of the holding surface portion 553c (regions where the holding surface portion 553c and the holding

surface portions

553b and 553d intersect), the gap between the outer peripheral end surface 561c of the translucent plate 56 and the wall portion 554c by the second interposed member 572. The first interposed member 571 closes the gap between the both end portions of the holding surface portion 553c and the side portion 562c on the back surface side of the translucent plate 56.

As described above, the translucent plate 56 is fixed in a state where the gap with the holding portion 552 (the translucent plate holding portion 55) is closed by the first interposing member 571 and the second interposing member 572.

According to the embodiment described above, the following effects can be obtained.
According to the projection optical apparatus 5 of the present embodiment, the translucent plate 56 is formed in a rectangular shape, and the second interposed member 572 is installed on the outer peripheral end surface 561 c on one side of the translucent plate 56. Then, the outer peripheral end surface 561c is inserted into the insertion portion (the region surrounded by the upper holding portion 555, the holding surface portion 553c, and the wall portion 554c) provided in the holding portion 552 corresponding to the outer peripheral end surface 561c on one side. To do. In this case, even if the outer peripheral end surface 561c is inserted, the second interposed member 572 can be inserted without peeling, and the second interposed member 572 can be pressed against the holding portion 552 (wall portion 554c). The first interposed member 571 is installed in the holding portion 552 (holding

surface portions

553a, 553b, 553d) corresponding to the side portions 562 (562a, 562b, 562d) on the other three sides of the translucent plate 56. Pressed by the light plate 56. Therefore, in the case where the holding portion 552 is configured to have a non-uniform shape, such as an installation structure in which the translucent plate 56 is inserted into the insertion portion, the interposed member 57 is replaced with the first interposed member 571 and the second interposed member. The gap between the translucent plate 56 and the holding portion 552 can be closed by pressing the first interposed member 571 and the second interposed member 572. Thereby, the inflow of dust into the projection optical housing 51 can be suppressed.

According to the projection optical device 5 of the present embodiment, the outer peripheral end surface 561c on one side of the translucent plate 56 is held by the insertion portion, and the side portions 562 (562a, 562b, 562d) on the three sides of the translucent plate 56 are retained. Among these, the side part 562a is pressed by the pressing member (fixing plate 58). Thereby, the translucent plate 56 is stably held by the translucent plate holding part 55 in a state where the interposition member 57 is pressed.

According to the projection optical apparatus 5 of the present embodiment, the first interposed member 571 and the second interposed member 572 are simply configured by the cushion member, so that the first interposed member 571 and the second interposed member 572 are simply configured. be able to.

According to the projector 1 of the present embodiment, the inside of the projection optical housing 51 through the gap between the translucent plate 56 and the projection optical housing 51 (the holding portion 552 of the translucent plate holding portion 55). Since the projection optical device 5 that can suppress the inflow of dust into the projector is provided, the quality of the projected image can be improved.

Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the scope of the invention. A modification will be described below.

In the projection optical apparatus 5 of the above-described embodiment, the holding portion 552 is provided with an insertion portion, and the outer peripheral end surface 561c to which the second interposed member 572 is attached is inserted to close the gap. However, the interposition member 57 (for example, the second interposition member 572) is installed on one of the outer peripheral end surfaces 561 (for example, the outer peripheral end surface 561c) of the translucent plate 56, even if the holding portion 552 is not provided with an insertion portion. It may be. Accordingly, for example, the interposition member 572 can be compressed by pressing the wall portion 554c with the outer peripheral end surface 561c. Accordingly, for example, the holding surface portion 553c around the wall portion 554c is not configured uniformly with the other holding

surface portions

553a, 553b, and 553d, and it is possible to cope with the case where the holding surface portion 553c cannot be used. In this case, the translucent plate 56 may be fixed using the fixing portion 558 and the fixing plate 58 of the present embodiment.

In the projection optical device 5 of the above embodiment, among the side portions 562 (562a, 562b, 562d) on the three sides of the light transmitting plate 56, the side portion 562a is pressed by the pressing member (fixing plate 58). However, the present invention is not limited to this, and any of the side portions (for example, the

side portions

562b and 562d) where the first interposed member 571 is disposed may be pressed by the pressing member.

In the projection optical apparatus 5 according to the above-described embodiment, the insertion portion is configured as the lower wall portion 554c in the holding portion 552 (wall portion 554), but may be configured as the upper wall portion 554a. In that case, the fixing portion 558 may be configured on the lower wall portion 554c. In this case, the light transmitting plate 56 may be formed by inserting the outer peripheral end surface 561 provided with the second interposed member 572 into the insertion portion.

In the projection optical apparatus 5 of the above embodiment, the first interposed member 571 is installed on the holding

surface portions

553a, 553b, and 553d of the holding portion 552 (holding surface portion 553). However, the present invention is not limited to this, and the first interposed member 571 may be installed on the

side portions

562a, 562b, and 562d of the light transmitting plate 56 corresponding to the holding

surface portions

553a, 553b, and 553d. In this case, the second interposed member 572 is installed on the outer peripheral end surface 561c of the translucent plate 56, and the first intervening member 571 is installed on the

side portions

562a, 562b, 562d of the translucent plate 56. .

In the projection optical apparatus 5 of the embodiment, the first interposed member 571 is formed in a frame shape corresponding to the shape on the three sides of the holding surface portion 553, and is formed in a plate shape in which the lower side is cut out. It is installed on the holding

surface portions

553a, 553b, and 553d of the holding portion 552 (holding surface portion 553). Further, the second interposed member 572 is formed in a rectangular plate shape corresponding to the shape of the outer peripheral end surface 561 c and is installed on the outer peripheral end surface 561 c of the translucent plate 56. However, the present invention is not limited to this configuration, and the first interposed member may be formed in a rectangular plate shape corresponding to the shape of one side of the holding surface portion 553, and may be installed on the holding surface portion 553a, for example. For example, the second interposed member is formed in a rectangular plate shape corresponding to the shape (including length) of the outer peripheral end surfaces 561b, 561c, and 561d, and the second interposed member is formed as the outer peripheral end surfaces 561b, 561c. , 561d may be attached. Even if the translucent plate 56 is installed in the holding portion 552 with this configuration, the same effect can be obtained.

In the projection optical device 5 of the above-described embodiment, the first interposed member 571 and the second interposed member 572 use a cushion member (in this embodiment, a polyethylene resin foam) that is configured similarly. However, the present invention is not limited to this, and the first interposed member 571 and the second interposed member 572 may be configured by different cushion members. For example, even if it is the same kind of cushion member, the elasticity (hardness) may be different. Further, the configuration of the cushion member itself may be different.

The translucent plate holding portion 55 in the upper housing 53 of the embodiment has an opening 551 (see FIG. 5) formed in a rectangular shape, but may have a shape that allows the projection light reflected by the reflection mirror 71 to pass therethrough. For example, it is not limited to a rectangular shape.
FIG. 7 is a perspective view showing a modified upper housing 153. FIG. 8 is a plan view of the upper housing 153 in which the translucent plate 56 is disposed as viewed from the translucent plate 56 side. An area 71L where the projection light reflected by the reflecting mirror 71 enters the translucent plate 56 is illustrated. It is the figure shown with the dashed-two dotted line.
As shown in FIG. 8, the region 71L has a shape in which the rear side (the outer peripheral end surface 561c side of the translucent plate 56) expands from the front side (the outer peripheral end surface 561a side). The opening 1551 of the translucent plate holding part 155 in the upper housing 153 is formed in a polygonal shape whose inner peripheral edge is separated from the region 71L and approximates the shape of the region 71L. Specifically, the holding surface portion 1553 in which the opening portion 1551 is formed has a shape extending at the four corners of the rectangular opening portion 551. As shown in FIG. 7, the extending portion 1553A extending at both front corners is wider than the extending portion 1553B extending at both rear corners, and the opening 1551 is formed in an octagonal shape. Yes.
As described above, since the holding surface portion 1553 is formed widely, it is possible to further suppress the inflow of dust into the projection optical casing 51 and to block the leaked light that does not contribute to the projection image. Thus, the quality of the projected image can be improved.

In the above embodiment, the translucent plate 56 is configured to be held using the two fixing plates 58 and the upper holding portion 555 (see FIG. 3). However, the fixing plate 58 is replaced with the upper holding portion 555. A configuration to be used, that is, a configuration in which the translucent plate 56 is held using three fixing plates 58 as shown in FIG. 8 is also possible.

As shown in FIG. 1, the projector 1 according to the embodiment is installed on the wall surface W so that the bottom surface 1 A is on the upper side via the support device SD, and the projection image is displayed on the screen SC installed on the lower side of the projector 1. Projecting. However, the method of installing the projector 1 is not limited, and the projector 1 may be installed on a ceiling surface, a floor surface, a desk surface, or the like and projected onto the screen SC installed on the wall surface W. Alternatively, the projector 1 may be installed on the desk surface and projected on the same desk surface.

In the projector 1 of the embodiment, the electro-optical device 35 employs a so-called three-plate method using three light modulation devices corresponding to R light, G light, and B light. However, the present invention is not limited to this, and a single plate type light modulation device may be adopted. Further, a light modulation device for improving the contrast may be additionally employed.

In the projector 1 of the embodiment, the electro-optical device 35 employs a transmissive light modulator (transmissive liquid crystal panel 351). However, the present invention is not limited to this, and a reflective light modulation device may be employed.

In the projector 1 according to the embodiment, the electro-optical device 35 employs a liquid crystal panel 351 as a light modulation device. However, the present invention is not limited to this, and it is generally sufficient that it modulates an incident light beam based on an image signal. For example, another type of light modulation device such as a micromirror light modulation device can be employed. For example, a DMD (Digital Micromirror Device) can be used as the micromirror type light modulation device.

In the projector 1 according to the embodiment, the optical unit 3 employs a lens integrator optical system including

lens arrays

321 and 322 as the illumination optical device 32 that equalizes the illuminance of the light beam emitted from the light source device 31. However, the present invention is not limited to this, and a rod integrator optical system including a light guide rod can also be employed.

In the optical unit 3 of the projector 1 according to the embodiment, the light source lamp 311 of the light source device 31 employs a discharge lamp such as an ultrahigh pressure mercury lamp. However, a laser diode, LED (Light Emitting Diode), organic EL ( Various solid state light emitting devices such as an electroluminescent device and a silicon light emitting device may be employed.

DESCRIPTION OF SYMBOLS 1 ... Projector, 5 ... Projection optical apparatus, 6 ... 1st optical system (refractive optical system), 7 ... 2nd optical system (reflection optical system), 31 ... Light source device, 51 ... Projection optical housing, 53, 153 ... Upper casing, 55, 155 ... Translucent plate holding part, 56 ... Translucent plate, 57 ... Interposing member, 58 ... Fixed plate (pressing member), 71 ... Reflecting mirror, 323 ... Polarization conversion element, 351 ... Liquid crystal panel (Light modulation device), 552... Holding part, 553, 1553... Holding surface part, 554... Wall part, 555... Upper holding part, 561. Intervening member.

Claims

A projection optical apparatus comprising a refractive optical system having a plurality of lenses and a reflective optical system having a reflective mirror,
A projection optical housing that houses the refractive optical system and the reflective optical system;
A translucent plate that is installed in the projection optical housing and transmits the projection light emitted from the reflection optical system;
The projection optical housing includes a translucent plate holding unit that holds the translucent plate,
The translucent plate holding unit includes an opening that allows the projection light to pass therethrough, and a holding unit that is formed along the opening to install the translucent plate,
Comprising an interposed member installed with elasticity between the translucent plate and the holding portion;
The interposition member has a first interposition member and a second interposition member, divides the holding portion and covers the entire circumference,
The first interposed member is installed on a side of the holding portion or the light transmitting plate, and the second interposed member is installed on an outer peripheral end surface of the light transmitting plate,
The projection optical apparatus, wherein the light transmissive plate is held by the light transmissive plate holding portion by pressing the first interposed member and the second interposed member against the holding portion.
The projection optical apparatus according to claim 1,
The translucent plate is formed in a rectangular shape,
The holding portion corresponding to the outer peripheral end surface on one side of the translucent plate includes an insertion portion that is installed by inserting the outer peripheral end surface;
The second interposed member is installed on the outer peripheral end surface of the one side,
The projection optical apparatus, wherein the first interposed member is installed on a side portion on the other three sides of the translucent plate or the holding portion corresponding to the side portion.
The projection optical apparatus according to claim 1,
The translucent plate is formed in a rectangular shape,
A pressing member that presses any one of the side portions where the first interposition member of the translucent plate is disposed;
The projection optical apparatus, wherein the light transmissive plate is held by the light transmissive plate holding portion by the pressing member.
A projection optical apparatus according to any one of claims 1 to 3,
The projection optical apparatus, wherein the first interposed member and the second interposed member are formed of a cushion member.
A light source device for emitting light;
A light modulation device for modulating the light according to image information;
The projection optical apparatus according to any one of claims 1 to 4, which projects the modulated light modulated by the light modulation apparatus.
An exterior housing that houses the light source device, the light modulation device, and the projection optical device, and constitutes an exterior;
The exterior casing includes an opening that allows the projection light that has passed through the opening to correspond to the opening of the projection optical casing.