JP2016180935A - Projection optical device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection optical device and a projector equipped with the projection optical device that can realize a configuration for holding the reflection mirror at an initial reference position and a mechanism capable of adjusting the position of the reflection mirror with high accuracy. To do. A reflection mirror of a projection optical device includes a fulcrum part installed on an optical axis of a projection optical casing, a rotation restricting part installed opposite to the fulcrum part, And a pair of receiving parts 73 that move the reflecting mirror 70 while being controlled by the rotation restricting part 72. In addition, the projection optical casing 51 has a coil spring 8 that urges the receiving portion 73 from the reflecting surface 702 side, a restriction plate 42 that restricts the movement of the receiving portion 73, and a direction opposite to the urging direction of the coil spring 8. The adjusting screw 9 that moves forward and backward by moving the receiving portion 73 forward and backward by pressing the receiving portion 73 installed against the urging force and pressing the receiving portion 73, the restricting plate 42 and the receiving portion 73, And an opening 554 that exposes the gap between them. [Selection] Figure 7

Description

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

  2. Description of the Related Art Conventionally, there has been known a projector that modulates light emitted from a light source (emitted light) with a light modulation device in accordance with 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.

  The reflection optical system includes a reflection mirror. The reflection mirror is an optical component that has an aspherical surface, reflects image light emitted from the refractive optical system at a wide angle of view, and projects it onto a projection surface such as a screen at a short distance. For this reason, the position of the reflection mirror needs to be adjusted with high accuracy.

  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

  When performing various optical adjustments of the projection optical apparatus, there is a case where a projection optical apparatus (what is called an actual machine) that is actually a product is used without using a case, a lens, or a mirror as a master. For example, in a refractive / reflective composite optical system projection optical device, when performing optical adjustment (focus adjustment, back focus adjustment, etc.) of the refractive optical system, the reflection mirror of the refractive optical system places the adjustment image at a predetermined position. Used for projection purposes. In this case, there is a problem that a configuration for holding the reflecting mirror at an initially set position (initial reference position) is required. Further, when the position adjustment of the reflection optical system (reflection mirror) is performed after the optical adjustment of the refractive optical system is completed, there is a problem that a mechanism capable of performing the position adjustment of the reflection mirror with high accuracy is required.

  Therefore, there is a demand for a projection optical device that realizes a configuration that holds the reflection mirror at an initial reference position, a mechanism that can adjust the position of the reflection mirror with high accuracy, and a projector that includes the projection optical device. It was.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projection optical apparatus according to this application example includes a refractive optical system having a plurality of lenses, a reflective optical system having a reflecting mirror, and a projection optical housing that houses the refractive optical system and the reflective optical system. The reflection optical device includes a fulcrum part that is installed on the optical axis of the projection optical housing and operates as a fulcrum, and a reflection mirror that faces the fulcrum part on a vertical plane including the optical axis. A rotation restricting portion that is installed on the outer peripheral portion to restrict rotation about the optical axis, and a pair of receiving portions that are installed on the outer peripheral portion of the reflecting mirror and are moved to move the reflecting mirror with the fulcrum portion as a fulcrum. The projection optical housing includes a biasing member that biases the receiving portion from the reflecting surface side of the reflecting mirror, a restriction plate that restricts movement of the receiving portion biased by the biasing member, Against the biasing force of the biasing member from the direction opposite to the biasing direction of the biasing member, An adjustment member that is installed on the control plate and presses the receiving portion to advance and retreat, thereby moving the receiving portion forward and backward, and an opening that exposes the space between the regulating plate and the receiving portion. And

  According to such a projection optical apparatus, when the receiving portion is urged and moved by the urging member from the reflecting surface side by the restriction plate, the movement of the receiving portion is restricted by contacting the restriction plate. Further, the adjustment member is installed on the regulation plate from the direction opposite to the urging direction. The adjustment member can be moved forward and backward. And an adjustment member presses a receiving part by moving forward / backward, and moves a receiving part against the biasing force of a biasing member. In addition, when a receiving part moves, a reflective mirror makes a fulcrum part installed on an optical axis a fulcrum, and is installed in the perimeter part of a reflective mirror opposite to a fulcrum part on the vertical plane containing an optical axis. The rotation restricting portion moves while being restricted from rotating about the optical axis. And since the receiving part is provided with one pair, the movement amount of a receiving part can each be adjusted by adjusting the amount which the adjustment member advances and retreats, respectively. With this configuration, the projection optical apparatus can adjust the position of the reflecting mirror with high accuracy.

Moreover, since the opening part which exposes between a control board and a receiving part is provided, the member which has predetermined dimensions, such as a gauge, is inserted from an opening part, and between the control board and receiving part which are exposed It is possible to insert a gauge. In this case, the gauge is inserted by pressing the receiving portion and moving the receiving portion against the urging force of the urging member. Thereby, the reflecting mirror can be easily held at the initial reference position. Therefore, when performing optical adjustment (focus adjustment, back focus adjustment, etc.) of the refractive optical system using an actual machine, it is easy to project an adjustment image at a predetermined position.
Therefore, according to such a projection optical apparatus, it is possible to realize a configuration that holds the reflecting mirror at an initial reference position and a mechanism that can adjust the position of the reflecting mirror with high accuracy.

  Application Example 2 In the projection optical apparatus according to the application example described above, the fulcrum portion includes a first protrusion portion having a spherical shape, the rotation restricting portion includes a second protrusion portion having a columnar shape, and the projection optical housing includes The fulcrum receiving part that slidably holds the first protrusion, the fulcrum pressing plate that presses the first protrusion against the fulcrum support, and the optical axis of the second protrusion. It is preferable to include a rotation restriction receiving portion that restricts movement in the rotation direction.

  According to such a projection optical apparatus, the fulcrum portion includes the first protrusion having a spherical shape. The first protrusion is pressed by the fulcrum pressing plate and is slidably installed on the fulcrum receiving part. Thereby, a fulcrum part supports a reflective mirror so that movement (rotation) is possible also in any direction. The rotation restricting portion includes a second protrusion having a cylindrical shape. The second projecting portion is installed in the rotation restricting receiving portion with restricted movement in the rotational direction about the optical axis. Thereby, a rotation control part supports a reflective mirror so that a movement or rotation is possible in the direction along the receiving part for rotation control. As a result, when the position of the reflection mirror is adjusted, the fulcrum portion can be slidable at the center position, and the movement direction of the reflection mirror can be restricted by the rotation restricting portion and the rotation restricting receiving portion. Therefore, highly accurate position adjustment of the reflecting mirror can be performed efficiently.

  Application Example 3 In the projection optical apparatus according to the application example described above, it is preferable that the receiving part is installed symmetrically with respect to a vertical line passing through the center of the fulcrum part.

  According to such a projection optical apparatus, the pair of receiving portions are installed symmetrically with respect to the vertical line passing through the center of the fulcrum portion, and thus are restricted by the rotation restricting portion with the fulcrum portion serving as a fulcrum, respectively. It can be moved in the direction and can be adjusted efficiently. Further, since the adjustment amount of the adjustment member and the movement amount of the receiving part are the same, the adjustment can be facilitated.

  Application Example 4 In the projection optical apparatus according to the application example, it is preferable that the urging member is configured by a coil spring and the adjustment member is configured by a screw member.

  According to such a projection optical apparatus, since the urging member is constituted by the coil spring, the receiving portion can be urged with a simple configuration. In addition, since the adjustment member is configured by a screw member, the adjustment member can be configured with a simple configuration. Further, the screw member can be installed on the restricting plate, and can be moved forward and backward by an easy operation of rotating the screw member.

  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. And a projection optical apparatus according to any one of the above.

  According to such a projector, since the projector is equipped with a projection optical device that realizes a configuration that holds the reflection mirror at an initial reference position and a mechanism that can adjust the position of the reflection mirror with high accuracy, the projection image The optical quality can be greatly 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 the structural member for installing a reflective mirror in a mirror accommodating part. The perspective view of the state which looked at the reflective mirror from the back side. The figure explaining the method of position adjustment of a reflective mirror. The figure explaining how to hold a reflective mirror in a predetermined standard position.

  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 of the present embodiment is installed on a support device SD installed on a wall surface W so that the bottom surface 1 </ b> A is on the upper side and the upper surface 1 </ b> B 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. The projector 1 projects the image light (projection light) reflected by the reflection optical system (reflection mirror 70 (see FIG. 2 and subsequent figures)) of the projection optical device 5 from the opposite side of the bottom surface 1A onto the screen SC. 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 includes a projection optical device 5 and an optical component housing 36 that houses the optical devices 31 to 35.

  With the above-described configuration, the optical unit 3 separates light emitted from the light source device 31 and passed 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. 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. In addition, about each optical apparatus 31-35 mentioned above, since it is utilized as an optical system of various general projectors, concrete description is abbreviate | 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 apparatus 5 as viewed from the front upper side. FIG. 4 is a cross-sectional view of the projection optical device 5 cut in the vertical direction along the optical axis C. 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. 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 relative to 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 70 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 is schematically configured to include a projection optical housing 51 serving as a base of the device, and a first optical system 6 and a second optical system 7 housed in the projection optical housing 51. . 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 54. And a body 53. The translucent plate 54 held by the upper housing 53 transmits the reflected light (projection light) reflected by the reflection mirror 70. The projection light transmitted through the light transmitting plate 54 is projected as an image on the screen SC.

  The first optical system 6 includes a first lens group L1 to a fourth lens group L4 and a corresponding lens group L1 to L4 that are arranged in order from the front side along the guide cylinder 65, the cam cylinder 66, and the optical axis C. A first lens frame 61 to a fourth lens frame 64 to be held. The second optical system 7 includes an aspheric reflecting mirror 70.

  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 70 of the second optical system 7, The emitted image light is reflected by the reflection mirror 70 and emitted upward as the projection light 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 70.

[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 substantially semi-cylindrical shape (half-conical truncated cone shape) whose upper side is cut off with the central axis as a boundary. The front end 5231 of the second housing portion 523 is opened, and the reflection mirror 70 is installed on the inner surface near the front end 5231. Note that a region in which the reflection mirror 70 of the second housing portion 523 is housed is referred to as a mirror housing portion 55. Details of the configuration of the mirror housing 55 will be described later.

[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 that is substantially perpendicular to the projection optical axis that is a line connecting the centers of the projection light fluxes with a rectangular transparent translucent plate 54 that transmits the projection light reflected by the reflection mirror 70. Are generally configured to include a translucent plate holding portion 531 that is held in step S3 and an inclined portion 532 that is formed at an angle that does not block the projection light that has passed through the translucent plate 54.

  The upper housing 53 is fixed to the upper end of the lower housing 52 with screws (not shown). 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.

[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 about 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 that define the movement operation of L1 to the 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 </ b> P, 62 </ b> P, and 63 </ b> 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 components for installing the reflection mirror 70 in the mirror housing 55. FIG. 5 is a perspective view of the projection optical device 5 as viewed from the front upper side. FIG. 6 is a perspective view of the reflecting mirror 70 as viewed from the rear side. With reference to FIGS. 3-6, the structure of the reflection mirror 70 and the mirror accommodating part 55, an assembly, and a function are demonstrated.

[Configuration of reflection mirror 70]
As shown in FIGS. 5 and 6, the reflecting mirror 70 includes a mirror body 701 having a substantially rectangular shape in a curved plan view with a rear side formed in a predetermined aspheric shape, and an aspheric surface on the rear side of the mirror body 701. A reflective surface 702 formed by depositing a reflective film in the shape region. The reflection mirror 70 is provided with a fulcrum portion 71 at the substantially center at the outer peripheral end of the upper portion of the mirror main body 701. The fulcrum part 71 is formed at a position substantially intersecting the optical axis C when the reflection mirror 70 is installed in the mirror housing part 55. The fulcrum portion 71 is a portion that operates as a fulcrum when the position of the reflection mirror 70 is adjusted.

  Specifically, as shown in FIG. 6, the fulcrum portion 71 includes a first protrusion 711 that protrudes toward the reflecting surface 702 and has a spherical shape. Further, as shown in FIG. 5, the fulcrum portion 71 includes a pressing protrusion 712 having a spherical shape that protrudes forward on the front side opposite to the first protrusion 711.

  The reflection mirror 70 is provided with a rotation restricting portion 72 at a substantially central portion at the outer peripheral end portion of the lower portion of the mirror main body 701. The rotation restricting portion 72 is formed on the outer peripheral portion of the reflecting mirror 70 facing the fulcrum portion 71. Specifically, the rotation restricting portion 72 is formed on a vertical plane including the optical axis C when the reflecting mirror 70 is installed in the mirror housing portion 55. The rotation restricting portion 72 includes a second projecting portion 721 having a columnar shape that extends downward from the outer peripheral end portion of the lower portion of the mirror main body 701. When the position of the reflection mirror 70 is adjusted, the rotation restricting portion 72 restricts the movement of the reflecting mirror in the rotation direction by restricting the movement of the second protrusion 721 in the rotation direction around the optical axis C. Part.

  The reflection mirror 70 is provided with a pair of receiving portions 73 that extend outward at the outer peripheral end portion, which is generally a corner portion, below the mirror body 701. The receiving part 73 is formed in a substantially symmetrical shape at a symmetrical position around a vertical line passing through the center position of the fulcrum part 71 (first projecting part 711). The receiving portion 73 is formed so as to be substantially parallel to a vertical plane orthogonal to the optical axis C when the reflecting mirror 70 is installed in the mirror housing portion 55.

  As shown in FIG. 5, the receiving portion 73 is provided with a contact surface 731 on the front side thereof, on which an adjustment screw 9 described later contacts. On the rear surface side, as shown in FIG. 6, a spring receiving portion 732 that receives a tip portion of a coil spring 8 described later is formed in a concave shape.

[Configuration of Mirror Housing 55]
The mirror housing portion 55 is configured on the inner surface side of the open front end portion of the lower housing 52, and holds the reflection mirror 70 so that the position of the reflection mirror 70 can be adjusted. As shown in FIG. 4, the mirror housing portion 55 includes a fulcrum receiving portion 551 that is formed on the optical axis C and that slidably receives the first protrusion 711 of the fulcrum portion 71. The fulcrum receiving portion 551 is formed with a conical groove, and receives the first protrusion 711 having a spherical shape with this groove. Further, as shown in FIG. 5, the mirror accommodating portion 55 is provided with a cylindrical fixing dowel 5511 having a hole for fixing a fulcrum pressing plate 41 described later near both sides of the fulcrum receiving portion 551. ing. Further, a reference projection 5512 serving as a reference when fixing the fulcrum pressing plate 41 is formed adjacent to the fixing dowel 5511.

  As shown in FIGS. 4 and 5, the mirror housing portion 55 slides the rotation restricting portion 72 (second projecting portion 721) of the reflecting mirror 70 on the inner surface of the lower outer peripheral portion facing the fulcrum receiving portion 551. A rotation restricting receiving portion 552 is provided that is held movably. The rotation restricting receiving portion 552 is formed so as to have a groove with a predetermined width from the opening tip portion along the optical axis C, and the second protrusion 721 having a columnar shape is slidably received by the groove.

  As shown in FIG. 5, the mirror housing portion 55 includes spring installation portions 553 for installing the coil springs 8 in the vicinity of the left and right corners of the lower outer peripheral portion. The spring installation portion 553 is formed to protrude in a cylindrical shape. In the spring installation portion 553, the coil spring 8 is installed inside the cylindrical shape. Further, the mirror housing portion 55 includes a cylindrical fixing dowel 5531 having a hole for fixing a regulating plate 42 to be described later in the vicinity of both sides of the spring installation portion 553. In addition, a reference projection 5532 serving as a reference when fixing the restriction plate 42 is formed adjacent to the fixing dowel 5531.

  As shown in FIG. 5, the mirror housing portion 55 is formed with a hole penetrating the mirror housing portion 55 (second housing portion 523) in each outer peripheral portion facing the spring installation portion 553 and the fixing dowel 5531. An opening 554 is provided. Specifically, the opening 554 is formed at a position where the space between the receiving portion 73 of the reflection mirror 70 and the restriction plate 42 is exposed when the reflection mirror 70 and the restriction plate 42 are installed in the mirror housing portion 55. Yes.

  The fulcrum pressing plate 41 slidably installs the fulcrum part 71 of the reflection mirror 70 in the mirror housing part 55 (fulcrum receiving part 551). In this embodiment, the fulcrum pressing plate 41 is formed of a metal plate member, and a hole portion 411 through which the fixing screw SC <b> 2 is inserted is formed corresponding to the hole portion of the fixing dowel 5511. Further, in the vicinity of the hole 411, a reference hole 412 corresponding to the reference protrusion 5512 is formed which serves as a reference when the fulcrum pressing plate 41 is installed on the fixing dowel 5511.

  When the coil spring 8 and the reflection mirror 70 are installed in the mirror housing portion 55, the restriction plate 42 restricts the movement of the reflection mirror 70 that moves forward by the biasing force of the coil spring 8 to the front side of the receiving portion 73. In this embodiment, the restriction plate 42 is made of a metal plate member, and includes a threaded portion 421 that is threaded for screwing the adjusting screw 9. Further, on both sides of the threaded portion 421, a hole portion 422 through which the fixing screw SC <b> 3 is inserted is formed corresponding to the hole portion of the fixing dowel 5531. In addition, a reference hole 423 corresponding to a reference protrusion 5532 is formed near the hole 422 and serves as a reference when the restricting plate 42 is installed on the fixing dowel 5531.

  In this embodiment, a coil spring 8 is used as the biasing member as shown in FIG. The coil spring 8 urges the receiving portion 73 of the reflecting mirror 70 from the reflecting surface 702 side. The coil spring 8 is composed of a compression coil spring.

  In this embodiment, as the adjustment member, as shown in FIG. 5, an adjustment screw 9 is used. The adjusting screw 9 is installed on the restricting plate 42 so as to be rotatable (movable forward and backward). Specifically, the adjustment screw 9 includes a screw portion 91 and is installed by being screwed into the threaded portion 421 of the restriction plate 42. The adjusting screw 9 includes a screw head 92 and is moved forward and backward with reference to the regulating plate 42 by being rotated by a jig such as a screwdriver. The tip end portion 911 of the screw portion 91 is a portion that abuts against the receiving portion 73 and presses it.

[Installation Method of Reflection Mirror 70 to Mirror Housing 55]
With reference to FIGS. 4-6, the installation method to the mirror accommodating part 55 of the reflective mirror 70 is demonstrated.
First, the coil spring 8 is installed in each spring installation part 553. Next, the fulcrum part 71 of the reflection mirror 70 is installed on the fulcrum receiving part 551 so that the tip of the installed coil spring 8 contacts the spring receiving part 732 of the reflection mirror 70 (receiving part 73). In addition, the second protrusion 721 of the reflection mirror 70 (rotation restricting portion 72) is inserted into the rotation restricting receiving portion 552 of the mirror housing portion 55. When the fulcrum part 71 is installed on the fulcrum receiving part 551, the first projecting part 711 is installed so as to contact the groove of the fulcrum receiving part 551.

  Next, the fulcrum pressing plate 41 is installed from the front side of the fulcrum part 71. In that case, the reference hole 412 of the fulcrum pressing plate 41 is inserted into the reference protrusion 5512. Next, the screw SC <b> 2 is inserted from the front side into the hole 411 of the fulcrum pressing plate 41 and screwed into the hole of the fixing dowel 5511. Thereby, the fulcrum pressing plate 41 is fixed to the fixing dowel 5511 in a state where the fulcrum part 71 is pressed. The fulcrum pressing plate 41 is fixed in a state where it abuts and presses against the pressing projection 712 of the fulcrum part 71 formed in a spherical shape.

  Next, the restriction plate 42 is installed from the front side of the receiving portion 73. In that case, the reference hole 423 of the restriction plate 42 is inserted into the reference protrusion 5532. Next, the screw SC3 is inserted through the hole 422 of the restricting plate 42 from the front side and screwed into the hole of the fixing dowel 5531. Thereby, the restriction plate 42 is fixed to the fixing dowel 5531. The restricting plate 42 is fixed in a state where it abuts on the receiving portion 73 (abutting surface 731) that is biased by the coil spring 8 and moves to the front side and presses the abutting surface 731.

Next, the adjusting screw 9 is installed on the threaded portion 421 from the front side of the regulating plate 42. More specifically, the screw head 91 is installed by rotating the screw head 92 of the adjustment screw 9 to screw the screw portion 91 into the threaded portion 421. The adjustment screw 9 can be moved forward and backward with the restricting plate 42 as a reference by rotating the screw head 92. As the screw portion 91 moves forward, when the tip end portion 911 of the screw portion 91 protrudes from the regulation plate 42 to the reflecting surface 702 side (rear side), the tip end portion 911 comes into contact with the contact surface 731 of the receiving portion 73.
With the above assembly, the reflecting mirror 70 is installed in the mirror housing 55 as shown in FIG.

  FIG. 7 is a diagram for explaining how to adjust the position of the reflecting mirror 70. FIG. 8 is a diagram for explaining how to hold the reflecting mirror 70 at a predetermined reference position. 7 and 8 are perspective views showing a state in which a main part including the receiving part 73 is cut along a vertical plane parallel to the optical axis C. FIG.

[How to adjust the position of the reflection mirror 70]
In the present embodiment, the position adjustment of the second optical system 7 (reflection mirror 70) is performed after the optical adjustment (focus adjustment, back focus adjustment, etc.) of the first optical system 6 is performed, and then the projection optical apparatus 5 is finally adjusted. As an optical adjustment. The position of the reflecting mirror 70 is adjusted by adjusting the position of the reflecting mirror 70 so that the projection light reflected by the reflecting mirror 70 matches a predetermined projection range. By performing the position adjustment of the reflection mirror 70 with high accuracy, the projected image does not suffer from curvature of field or a decrease in contrast due to aberration variation, and the image quality can be greatly improved.

  The adjusting screw 9 of the present embodiment is formed with a right screw. As shown in FIG. 7, by rotating the adjusting screw 9 installed on the regulating plate 42 in the right direction (clockwise), the adjusting screw 9 moves (forward) in the direction of the reflecting surface 702 (rear side). To do. On the other hand, by rotating in the left direction (counterclockwise), it moves (retreats) to the opposite side (front side) to the reflecting surface 702 direction.

  Hereinafter, for convenience of explanation, the case where the tip end portion 911 of the adjustment screw 9 does not protrude from the rear surface 424 of the regulating plate 42 (when the tip end portion 911 is located inside the threaded portion 421) will be described as the initial position. In this case, the contact surface 731 of the receiving portion 73 is in contact with the rear surface 424 of the restriction plate 42 by the biasing force of the coil spring 8.

  In this state, by rotating the adjustment screw 9 (right rotation), the tip end portion 911 of the adjustment screw 9 starts to protrude from the rear surface 424 of the regulation plate 42. As a result, the distal end portion 911 starts to contact the contact surface 731 of the receiving portion 73. By further rotating, the tip end portion 911 starts to press the coil spring 8 against the urging force of the coil spring 8 via the contact surface 731 (receiving portion 73). By further rotating the adjustment screw 9, the adjustment screw 9 moves forward against the biasing force of the coil spring 8, and as shown in FIG. 7, the tip end portion 911 moves the receiving portion 73 backward.

  When the receiving portion 73 (reflection mirror 70) moves, the fulcrum portion 71 is used as a fulcrum, and the rotation restricting portion 72 moves while being restricted from rotating about the optical axis C. Specifically, since the first protrusion 711 having a spherical shape is slidably installed on the fulcrum receiving portion 551, the fulcrum 71 can move (rotate) the reflecting mirror 70 in any direction. To support. Further, the second protrusion 721 having a columnar shape is installed in a rotation restricting receiving portion 552 formed by a groove along the direction of the optical axis C so as to be slidable while restricting the moving direction. The restricting portion 72 supports the reflection mirror 70 so as to be rotatable or movable in the front-rear direction along the groove of the rotation restricting receiving portion 552. Thereby, the reflecting mirror 70 is driven by the adjustment screw 9 to move forward and backward, and the movement direction and the movement amount are regulated by the rotation regulating unit 72 and the rotation regulating receiving unit 552 with the fulcrum unit 71 as the center position. Moving.

Here, for convenience of explanation, the following description will be made with the left direction as the left side (right direction as the right side) when viewed relative to the emission side from which the image light is emitted from the first optical system 6.
Since the receiving portions 73 are installed in a pair in the left-right direction, for example, when the right adjustment screw 9 is advanced and the right receiving portion 73 is moved to the rear side, the reflecting mirror 70 is centered on the fulcrum portion 71. The rotation is restricted by the rotation restricting portion 72 and rotates leftward. On the other hand, when the left adjustment screw 9 is moved forward and the left receiving portion 73 is moved to the rear side, the reflection mirror 70 is restricted by the rotation restricting portion 72 around the fulcrum portion 71 and moved in the right direction. Rotate. Further, the adjustment screw 9 can be moved backward to rotate in the direction opposite to the forward movement.

Moreover, a pair of receiving part 73 is installed symmetrically with respect to the vertical line which passes along the center of the fulcrum part 71 in this embodiment. In other words, the pair of receiving portions 73 are formed symmetrically with respect to a straight line connecting the centers of the first protruding portion 711 and the second protruding portion 721. Therefore, the adjustment amount (rotation amount) of the adjustment screw 9 and the movement amount of the receiving portion 73 are the same on the left and right. When the left and right adjustment screws 9 are moved forward (or retracted), the reflecting mirror 70 moves in the opposite direction.
As described above, the position of the reflection mirror 70 can be adjusted with high accuracy by rotating each adjustment screw 9.

  When the position adjustment of the reflection mirror 70 is completed, the adjustment screw 9 is urged by the pressing force of the coil spring 8, and the screw portion 91 is fixed to the threaded portion 421 of the regulating plate 42, and the adjusted reflection mirror is adjusted. 70 is held.

  In the present embodiment, the adjustment screw 9 is fixed to the regulation plate 42 using an adhesive or the like with respect to the adjustment screw 9 after the adjustment is completed. By fixing the adjustment screw 9 to the regulation plate 42 using an adhesive or the like, the adjustment screw 9 and the regulation plate 42 are screwed together when vibration or impact is applied to the adjusted projection optical device 5. It is further prevented that the position of the reflection mirror 70 is shifted due to the loose state as compared with the case where it is not bonded. As a result, the optical performance of the projection optical device 5 is further prevented from being deteriorated compared to the case where the projection optical device 5 is not bonded.

  Regarding adhesion, in the present embodiment, an adhesive is applied and fixed between the screw portion 91 of the adjusting screw 9 and the threaded portion 421 of the regulating plate 42. The adhesive uses an ultraviolet curable adhesive, but is not limited to this.

[How to hold the reflecting mirror 70 at a predetermined reference position]
In the present embodiment, optical adjustment (focus adjustment, back focus adjustment, etc.) of the first optical system 6 is performed using an actual machine. In that case, the adjustment image is projected onto a predetermined position. Therefore, it is necessary to hold the reflection mirror 70 at an initially set position (initial reference position). In order to hold the reflecting mirror 70 at the initial reference position, in the present embodiment, the opening 554 is used.

  As shown in FIG. 8, in this embodiment, a member having a predetermined dimension (thickness) is inserted between the pair of exposed regulating plates 42 and the receiving portion 73 through the opening 554. The receiving unit 73 is moved rearward by a predetermined dimension (thickness) to hold the reflection mirror 70 at the initial reference position. The predetermined dimension is determined in accordance with the amount of movement necessary for the reflection mirror 70 to project an adjustment image at a predetermined position. In this embodiment, a plate-like gauge G formed of a metal plate is used as a member having a predetermined dimension. In the gauge G, a tapered portion G1 is formed at the distal end portion on the insertion side to improve the ease of insertion. The gauge G has an outer shape that can be inserted into the opening 554.

  In the present embodiment, when the gauge G is inserted, the tip end portion 911 of the adjustment screw 9 does not protrude from the rear surface 424 of the regulating plate 42 (the tip end portion 911 is positioned inside the threaded portion 421). State). In this case, the contact surface 731 of the receiving portion 73 is in contact with the rear surface 424 of the restriction plate 42 by the biasing force of the coil spring 8.

In this state, the gauge G is inserted into the opening 554 from the outside of the mirror housing 55 (second housing 523). And the front-end | tip part of the insertion side (taper part G1) of the gauge G is applied and pressed between the control board 42 exposed by the opening part 554, and the receiving part 73. FIG. By this operation, the gauge G is inserted between the regulating plate 42 and the receiving portion 73 by pressing the receiving portion 73 and moving the receiving portion 73 against the biasing force of the coil spring 8. Can do.
As described above, by inserting the gauge G between the regulating plate 42 and the receiving portion 73, the reflecting mirror 70 is moved by the thickness of the gauge G (predetermined dimension) and held at the initial reference position. can do.

  In the present embodiment, when the gauge G is inserted, the position of the adjustment screw 9 is such that the tip end portion 911 does not protrude from the rear surface 424 of the restricting plate 42, but is not limited thereto. If the gauge G can be inserted and the receiving portion 73 can be moved by the thickness of the gauge G, the initial position of the adjusting screw 9 does not matter.

  When the optical adjustment of the first optical system 6 is completed, the inserted gauge G is extracted from between the regulating plate 42 and the receiving portion 73. Thereafter, the final position adjustment of the reflecting mirror 70 itself is performed.

According to the embodiment described above, the following effects can be obtained.
According to the projection optical apparatus 5 of the present embodiment, when the receiving portion 73 is urged by the coil spring 8 from the reflecting surface 702 side and moves to the front side, the receiving portion 73 is brought into contact with the restriction plate 42 and is restricted from moving to the front side. The Further, the adjustment screw 9 is installed on the regulation plate 42 from the direction opposite to the urging direction. The adjustment screw 9 can be moved forward and backward. The adjustment screw 9 moves forward and backward to press the receiving portion 73 and move the receiving portion 73 against the urging force of the coil spring 8. In addition, when the receiving part 73 moves, the reflection mirror 70 uses the fulcrum part 71 installed on the optical axis C as a fulcrum, and the reflection mirror 70 faces the fulcrum part 71 on the vertical plane including the optical axis C. It moves while being restricted from rotating about the optical axis C by a rotation restricting portion 72 installed on the outer periphery of the lens. And since the receiving part 73 is provided with one pair, the movement amount of the receiving part 73 can each be adjusted by adjusting the amount to which the adjustment screw 9 advances and retreats, respectively. With this configuration, the projection optical apparatus 5 can adjust the position of the reflection mirror 70 with high accuracy.

Further, since the opening 554 that exposes the space between the regulation plate 42 and the receiving portion 73 is provided, a gauge G having a predetermined dimension is inserted from the opening 554, and the gap between the regulation plate 42 and the receiving portion 73 is inserted. It becomes possible to insert the gauge G into the. Thereby, the reflecting mirror 70 can be easily held at the initial reference position. Therefore, when performing optical adjustment (focus adjustment, back focus adjustment, etc.) of the first optical system 6 (refractive optical system) using an actual machine, it becomes easy to project an adjustment image at a predetermined position. . Thus, the optical adjustment of the first optical system 6 can be performed while viewing the adjustment image projected at the predetermined position.
Therefore, according to the projection optical apparatus 5 of the present embodiment, a configuration that holds the reflection mirror 70 at the initial reference position and a mechanism that can adjust the position of the reflection mirror 70 with high accuracy can be realized with an easy configuration. Can do.

  According to the projection optical apparatus 5 of the present embodiment, since the first optical system 6 is optically adjusted using the actual machine with the configuration in which the reflection mirror 70 is held at the initial reference position, the optical adjustment corresponding to the actual machine is performed. Yes. Thereby, compared with the case where the optical adjustment of the 1st optical system 6 is performed using not a real machine but a master, optical adjustment can be performed with high precision.

  According to the projection optical device 5 of the present embodiment, the fulcrum portion 71 (first protrusion 711) that is the center position when the position of the reflection mirror 70 is adjusted is configured on the optical axis C. For example, compared to a configuration in which the fulcrum portion 71 is installed at a position shifted from the optical axis C, it is possible to simplify the optical design of the aspherical reflecting mirror 70 and simplify the mold manufacturing, and to achieve high accuracy. Position adjustment can be easily performed.

  According to the projection optical apparatus 5 of the present embodiment, the fulcrum portion 71 includes the first protrusion 711 having a spherical shape. The first protrusion 711 is slidably installed on the fulcrum receiving portion 551 by being pressed by the fulcrum pressing plate 41. Thereby, the fulcrum part 71 can support the reflection mirror 70 so that it can move (rotate) in any direction. The rotation restricting portion 72 includes a second protrusion 721 having a cylindrical shape. The second projecting portion 721 is placed on the rotation restricting receiving portion 552 while being restricted from moving in the rotational direction about the optical axis C. Accordingly, the rotation restricting portion 72 can support the reflection mirror 70 so as to be movable or rotatable in a direction along the rotation restricting receiving portion 552. Accordingly, when the position of the reflection mirror 70 is adjusted, the fulcrum portion 71 is set to the slidable center position, and the movement direction of the reflection mirror 70 can be restricted by the rotation restricting portion 72 and the rotation restricting receiving portion 552. Therefore, highly accurate position adjustment of the reflecting mirror 70 can be performed efficiently.

  According to the projection optical apparatus 5 of the present embodiment, the pair of receiving portions 73 are installed symmetrically with respect to the vertical line passing through the center of the fulcrum portion 71, so that the rotation restricting portion with the fulcrum portion 71 as a fulcrum. 72, and can be moved in opposite directions, so that efficient adjustment can be performed. Further, since the adjustment amount (rotation amount) of the adjustment screw 9 and the movement amount of the receiving portion 73 are the same on the left and right, the adjustment can be facilitated.

  According to the projection optical apparatus 5 of the present embodiment, since the biasing member is configured by the coil spring 8, the receiving portion 73 can be biased with a simple configuration. Moreover, since the adjustment member is composed of the adjustment screw 9 as a screw member, the adjustment member can be configured with a simple configuration. Further, the adjustment screw 9 can be installed on the restricting plate 42 and can be moved forward and backward by an easy operation of rotating the adjustment screw 9.

According to the projection optical device 5 of the present embodiment, the restriction plate 42 is provided on the front side of the receiving portion 73 with respect to the receiving portion 73 biased by the coil spring 8 from the reflecting surface 702 side (rear side) of the reflecting mirror 70. The receiving portion 73 is received. The restricting plate 42 is made of a metal plate, and the adjusting screw 9 for moving the receiving portion 73 is installed in the threaded portion 421 of the restricting plate 42.
Here, in order to compare with the present embodiment, an example of a configuration different from the configuration of the present embodiment will be given. For example, the coil spring 8 is installed in the same manner as in this embodiment, and the screw head 92 of the adjusting screw 9 is positioned on the front side of the reflecting mirror 70 (receiving portion 73) without using the regulating plate 42. Abut. Then, the threaded portion 91 is inserted through the inside of the coil spring 8, and the threaded portion that is screwed with the threaded portion 91 is installed in the mirror accommodating portion 55 that receives the coiled spring 8 on the rear side of the receiving portion 73. The threaded portion is inserted into the mirror housing 55 using a nut.
Compared with this configuration, in this embodiment, the screw length can be shortened, and the distance between the screw head 92 and the threaded portion (threaded portion) can be shortened. When moving, it is possible to perform stable adjustment without rattling or the like, and to improve reliability after position adjustment.

  According to the projector 1 of the present embodiment, the projection optical device 5 that realizes a configuration that holds the reflection mirror 70 at an initial reference position and a mechanism that can adjust the position of the reflection mirror 70 with high accuracy with an easy configuration. Therefore, the optical quality of the projected image can be greatly improved.

  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 embodiment, the coil spring 8 is used as the biasing member. However, the urging member is not limited to a coil spring, and a leaf spring or the like may be used.

  In the projection optical device 5 according to the embodiment, the pair of receiving portions 73 are installed symmetrically with respect to a vertical line passing through the center of the fulcrum portion 71. However, the pair of receiving portions 73 may be installed so as not to be symmetric. If not symmetrical, the amount of movement of the receiving portion with respect to the amount of movement of the adjustment member will be different, but the reflection mirror 70 can be adjusted.

  In the projection optical apparatus 5 according to the embodiment, the opening 554 is formed by a hole that penetrates the mirror housing 55 and exposes the space between the receiving portion 73 and the regulating plate 42. However, the opening 554 only needs to expose the space between the receiving portion 73 and the restriction plate 42, and may be formed in a notch shape at the front end of the mirror housing portion 55.

  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 </ b> 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 according to the embodiment, the electro-optical device 35 adopts 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 of 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 adopted as the micromirror type light modulation device.

  In the projector 1 of 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 uniformizes 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 ultra-high pressure mercury lamp, but a laser diode, LED (Light Emitting Diode), organic EL ( Various solid light-emitting elements such as an electro luminescence element and a silicon light-emitting element 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), 8 ... Coil spring (biasing member), 9 ... Adjustment screw (Adjustment) Member), 31 ... light source device, 41 ... fulcrum pressing plate, 42 ... regulation plate, 51 ... projection optical housing, 55 ... mirror housing portion, 70 ... reflection mirror, 71 ... fulcrum portion, 72 ... rotation restriction portion, 73 ... receiving part, 351 ... liquid crystal panel (light modulation device), 421 ... threaded part, 551 ... receiving part for fulcrum, 552 ... receiving part for rotation restriction, 553 ... spring setting part, 554 ... opening, 702 ... reflecting surface, 711 ... 1st protrusion part, 721 ... 2nd protrusion part, C ... Optical axis.

Claims (5)

A projection optical apparatus comprising a refractive optical system having a plurality of lenses, a reflective optical system having a reflective mirror, and a projection optical housing that houses the refractive optical system and the reflective optical system,
The reflection mirror is
A fulcrum portion installed on the optical axis of the projection optical housing and operating as a fulcrum;
On a vertical plane including the optical axis, a rotation restricting portion that is installed on an outer peripheral portion of the reflecting mirror facing the fulcrum portion and restricts rotation around the optical axis;
A pair of receiving portions that are installed and pressed on the outer peripheral portion of the reflecting mirror to move the reflecting mirror with the fulcrum portion serving as a fulcrum;
The projection optical casing is:
A biasing member that biases the receiving portion from the reflecting surface side of the reflecting mirror;
A restricting plate for restricting movement of the receiving portion biased by the biasing member;
By placing the receiving part against the urging force of the urging member from the direction opposite to the urging direction of the urging member, pressing the receiving part against the urging force of the urging member, moving the receiving part forward and backward. An adjustment member for moving forward and backward;
An projection optical apparatus comprising: an opening that exposes a space between the restriction plate and the receiving portion. The projection optical apparatus according to claim 1,
The fulcrum portion includes a first protrusion having a spherical shape,
The rotation restricting portion includes a second protrusion having a cylindrical shape,
The projection optical casing is:
A fulcrum receiving portion for slidably holding the first protrusion,
A fulcrum pressing plate that slidably presses the first protrusion against the fulcrum receiving portion;
A rotation restricting receiving portion for restricting movement of the second projecting portion in the rotation direction about the optical axis;
A projection optical apparatus comprising: The projection optical apparatus according to claim 1 or 2,
The projection optical apparatus according to claim 1, wherein the receiving part is installed symmetrically with respect to a vertical line passing through a center of the fulcrum part. A projection optical apparatus according to any one of claims 1 to 3,
The projection optical apparatus, wherein the biasing member is configured by a coil spring, and the adjustment member is configured by a screw 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 claim 1, wherein the projection optical apparatus modulates modulated light modulated by the light modulation apparatus.
A projector comprising:

Images