JP2007316519A - Projection type video apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent image shake without changing optical performance and increasing the number of components and manufacturing costs. <P>SOLUTION: A rear projection TV has, in a housing, an image display element and a front group lens 206 for magnifying and projecting an image displayed on the image display element onto a screen. The rear projection TV includes a fastening mechanism by which a lens barrel 207 for a rear group lens fixed to a housing and a front group lens 206 are fastened in a direction perpendicular to the direction of the optical axis of the front group lens 206. This prevents vibration of the front group lens 206 without changing the optical performance of the rear projection TV. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projection type projection apparatus.

  2. Description of the Related Art Conventionally, there is a projection type projection apparatus that includes an image display element and a projection lens that enlarges and projects an image displayed on the image display element onto a screen. Such a projection type projection apparatus includes a projection lens for enlarging an image displayed on the image display element.

  As a projection type projection apparatus, there is a rear projection type projection apparatus in which an image display element and a projection lens are accommodated in a housing, and an image is projected from a housing to a screen. In a rear projection type projection apparatus, for example, when a projection lens vibrates due to the generation of heavy bass from a bass speaker, the projection position of the image on the screen changes, and the image projected on the screen vibrates. Shake occurs.

  Since image shaking is a cause of deterioration in the quality of an image projected on a screen, there have been various techniques for preventing image shaking caused by vibration of a projection lens. For example, there is a technique in which an actuator that operates so as to cancel the vibration of the projection lens is provided, and image shaking is prevented by controlling this actuator.

  In addition, for example, there is a technique for preventing image shaking by fastening a lens barrel supporting a projection lens to a fixing member fixed to a housing to prevent vibration of the projection lens (for example, , See Patent Document 1 below). In the technique described in Patent Document 1, for example, a lens barrel is fastened to a fixing member using a screw mechanism or an adhesive.

JP 2005-352293 A

  However, among the above-described conventional techniques, the technique for controlling the actuator requires an actuator and an electric circuit for controlling the actuator, which increases the number of parts and the manufacturing cost.

  Of the conventional techniques described above, in the technique described in Patent Document 1, for example, when a screw is excessively tightened or an adhesive is excessively used, depending on the fastening method, the projection lens may be used. On the other hand, there is a concern that a force that causes the optical axis of the projection lens to tilt from the position of the normal optical axis is applied, causing a change in the optical performance of the rear projection type projection apparatus.

  The present invention eliminates the problems caused by the prior art described above, and a projection type projection apparatus capable of preventing image shaking without changing the optical performance and without increasing the number of parts and the manufacturing cost. The purpose is to provide.

  A projection type projection apparatus according to the present invention includes an image display element and a projection lens for enlarging and projecting an image displayed on the image display element onto a screen. There is provided fastening means for fastening a fixed member provided in a fixed manner and a holding member for holding the projection lens in a direction orthogonal to the direction of the optical axis of the projection lens.

  According to the present invention, the fixing member and the holding member can be fastened without applying a force that causes the optical axis of the projection lens to tilt from the normal optical axis to the projection lens. Further, according to the present invention, the fixing member and the holding member can be fastened without providing an actuator for preventing vibration or an electric circuit for driving the actuator.

  That is, according to the present invention, the vibration of the projection lens can be achieved by fastening the fixing member and the holding member without changing the optical performance of the projection type projection apparatus and without increasing the number of parts and the manufacturing cost. Can be prevented, and image shaking can be prevented.

  In the projection type projection apparatus according to the present invention, the fastening means fastens the fixing member and the holding member at a position within a plane including the optical axis and outside the projection lens. Features.

  According to the present invention, the direction of the force generated by fastening the fixing member and the holding member and the direction of rotating the projection lens around the optical axis are the same direction, so the optical axis of the projection lens is normal. Since the fixing member and the holding member can be fastened without applying a force that inclines from the optical axis to the projection lens, vibration of the projection lens can be performed without changing the optical performance of the projection type projection apparatus. It is possible to prevent image shaking.

  The projection type projection apparatus according to the present invention further includes a reinforcing stay provided on the holding member or the fixing member and extending toward the fixing member or the holding member, and the fastening means includes the reinforcing stay. The fixing member or the holding member is fastened.

  According to the present invention, by adjusting the shape and arrangement position of the reinforcing stay, the fixing member and the holding member can be fastened regardless of the positional relationship between the fixing member and the holding member, thereby preventing image shaking. Therefore, it is possible to improve the degree of freedom in designing a projection-type projection apparatus that can perform the projection.

  Further, the fastening means in the projection type projection apparatus according to the present invention includes a recess provided in the fixing member or the holding member and having a direction perpendicular to the optical axis direction as an axial direction, and the reinforcing stay. And an abutting member provided on the inserting member and abutting against the reinforcing stay from the opposite side of the concave portion with the reinforcing stay interposed therebetween. .

  According to the present invention, since the fixing member and the holding member can be fastened with a simple configuration, the increase in the number of parts of the projection type projection apparatus and the number of work steps in assembling can be suppressed. be able to.

  Further, the projection type projection apparatus according to the present invention is provided with a support means for supporting the holding member so as to be movable in the optical axis direction, and provided in the reinforcing stay, penetrating in the fastening direction by the fastening means, and A slit having an axial direction as a longitudinal direction, and the insertion member is inserted into the recess in a state of being inserted at an arbitrary position in the slit.

  According to the present invention, the fixing member and the holding member can be fastened regardless of the position of the holding member that moves with the adjustment of the focal position of the projection lens with respect to the screen (hereinafter referred to as “focus adjustment”). it can. Further, according to the present invention, the position of the projection lens after focus adjustment (hereinafter referred to as “focus lock”) can be shared by the fastening means.

  Further, in the projection type projection apparatus according to the present invention, the fastening means is a screw hole provided in the fixing member or the holding member and a screw screwed into the screw hole in a state of being inserted into the slit. It is characterized by.

  According to this invention, since the screw screwed into the screw hole can be loosened or removed, the focus adjustment and the focus lock can be performed again even after the fixing member and the holding member are once fastened.

  According to the projection type projection apparatus of the present invention, it is possible to prevent image shaking without changing the optical performance, and without increasing the number of parts and the manufacturing cost.

  Exemplary embodiments of a projection type projection apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings. This embodiment shows an application example to a rear projection type television (hereinafter referred to as “rear pro television”) that realizes the projection type projection apparatus according to the present invention.

  FIG. 1 is a perspective view showing a rear professional television according to the embodiment. As shown in FIG. 1, the rear professional television 100 includes a housing 101 that forms an outline of the rear professional television 100. The housing 101 includes an upper cabinet 102 disposed on the upper side and a lower cabinet 103 disposed on the lower side. Note that the housing 101 can be configured integrally without being divided into the upper cabinet 102 and the lower cabinet 103.

  The housing 101 is provided with a screen 104, a high-frequency speaker 105, and a low-frequency speaker 106. The screen 104, the treble speaker 105, and the bass speaker 106 are provided in the housing 101 so as to be oriented in the same direction. Hereinafter, the side of the housing 101 on which the screen 104, the high-frequency speaker 105, and the low-frequency speaker 106 are provided is the front side of the rear pro TV 100, and the side opposite to the front side of the rear pro TV 100 in the housing 101 is the back side of the rear pro TV 100. Let it be the side. Although not shown, the housing 101 is provided with an antenna that receives a television signal transmitted from a television station.

  FIG. 2 is a longitudinal side view showing the rear professional television 100 of the embodiment. As shown in FIG. 2, a television control unit 201 is provided in the housing 101. Although not shown, the antenna described above is connected to the television control unit 201. The television control unit 201 detects a signal related to image information and a signal related to audio information from the television signal received by the antenna, and controls the operation of each unit included in the rear pro television 100 based on the detected signal. .

  In addition, when a user operates a remote controller (not shown), the television control unit 201 may control the operation of each unit included in the rear pro television 100 according to the operation content. The remote controller includes, for example, operation keys that accept user operations, a display unit that displays operation details, and a communication unit that transmits operation details to the television control unit 201. The operation keys and the display unit are not limited to those provided separately from the housing 101 and may be provided in the housing 101.

  In the housing 101, an image display element 202 is provided on the front side of the television control unit 201. The image display element 202 receives an image signal output from the television control unit 201 and displays an image based on a signal relating to image information detected from the television signal. The image display element 202 can be configured using, for example, a liquid crystal panel.

  In the housing 101, a projection lens system 203 is provided on the front side of the image display element 202. The projection lens system 203 enlarges the image displayed by the image display element 202. The projection lens system 203 includes a rear group lens 204, an intermediate mirror 205, and a front group lens 206.

  The rear lens group 204 in the projection lens system 203 focuses the light rays of the image displayed by the image display element 202 and passes them to the intermediate mirror 205 side. The rear lens group 204 can be constituted by a single convex lens, for example. In addition, the rear group lens 204 can be configured by combining, for example, one or more convex lenses and one or more concave lenses. The rear group lens 204 is disposed on the front side of the image display element 202 in the housing 101 and is supported by a rear group lens barrel 207.

  The rear lens group barrel 207 can be formed using, for example, aluminum die-casting or engineering plastic. Specific examples of the engineering plastic include polycarbonate and PPS. The rear lens group barrel 207 is fixed to the lower cabinet 103 by a fixing method such as screw fixing. In this embodiment, a fixing member is realized by the rear-group lens barrel 207.

  The intermediate mirror 205 in the projection lens system 203 is disposed in the housing 101 on the front side of the rear group lens 204, and reflects the light beam that has passed through the rear group lens 204 toward the front group lens 206. The intermediate mirror 205 is held by a folding lens barrel 208. The bending lens barrel 208 is fixed to the rear lens group lens barrel 207 using screws (see FIG. 3).

  The front lens group 206 in the projection lens system 203 diffuses the light beam reflected by the intermediate mirror 205 and passes it to the screen 104 side. In this embodiment, a projection lens is realized by the front group lens 206. The front lens group 206 can be constituted by, for example, a single concave lens.

  Further, the front group lens 206 can be configured by combining, for example, one or more concave lenses and one or more convex lenses. Furthermore, the front group lens 206 can be configured by combining a plurality of types of convex lenses, for example.

  The front lens group 206 is disposed on the optical axis of the light beam reflected by the intermediate mirror 205 in the housing 101. More specifically, the front group lens 206 is disposed at a position where the optical axis of the light beam reflected by the intermediate mirror 205 matches the optical axis of the front group lens 206. The front group lens 206 is supported by a front group lens barrel 209. In this embodiment, the holding member is realized by the front group lens barrel 209.

  The front lens group barrel 209 can be formed using aluminum die-casting or the above-described engineering plastic. The front lens group barrel 209 is connected to the folding lens barrel 208 in a state where it can be brought into contact with and separated from the folding lens barrel 208 described above.

  In the projection lens system 203, in place of the above-described configuration, the intermediate mirror 205 is not provided, and the optical axis of the front group lens 206 and the optical axis of the rear group lens 204 are configured to be the same optical axis. Is also possible. In this case, for example, in order to focus the rear group lens 204 and the front group lens 206, one or a plurality of lenses movable in the optical axis direction may be included.

  In the housing 101, an image projection mirror 210 is provided on the optical path from the projection lens system 203 to the screen 104. The image projection mirror 210 reflects the light beam that has passed through the front lens group 206 toward the screen 104. The image projection mirror 210 may be singular or plural.

  Note that the light beam that has passed through the front lens group 206 may be directly projected onto the screen 104 from the back side of the screen 104 without providing the image projection mirror 210. Specifically, for example, when the projection lens system 203 is configured such that the optical axis of the front group lens 206 and the optical axis of the rear group lens 204 are the same optical axis without providing the intermediate mirror 205. Can easily realize a configuration in which the light beam that has passed through the front lens group 206 is directly irradiated onto the screen 104.

  FIG. 3 is an exploded perspective view (part 1) showing the projection lens system 203. FIG. As shown in FIG. 3, the folding lens barrel 208 that supports the intermediate mirror 205 is fixed to the rear lens group lens barrel 207 using a fixing screw 301. The rear group lens barrel 207 is provided with a screw hole 303 as a recess into which a fastening screw 302 as an insertion member is screwed. The screw hole 303 is provided with the direction perpendicular to the optical axis direction in the optical path from the intermediate mirror 205 to the image projection mirror 210 as the axial direction.

  In the embodiment, the recess is realized by the screw hole 303. Further, in the embodiment, in the fastening screw 302, an insertion member is realized by a shaft portion on which a thread is formed, and a contact member is realized by a head portion to which a tool such as a screwdriver is applied. The contact member may be a washer or the like positioned between the head portion of the fastening screw 302 and the reinforcing stay 305.

  Reference numeral 304 in FIG. 3 denotes a focus ring that connects the bending lens barrel 208 and the front lens group lens barrel 209. Also, reference numeral 305 in FIG. 3 is a reinforcing stay provided in the front lens group barrel 209. The reinforcing stay 305 extends from the front group lens barrel 209 toward the rear group lens barrel 207 in a state where the bending lens barrel 208 and the front group lens barrel 209 are connected. Is provided.

  The reinforcing stay 305 in the embodiment is formed integrally with the front lens group barrel 209. The reinforcing stay 305 may be formed by a member different from the front lens group barrel 209 and fixed to the front lens group lens barrel 209 using screws, an adhesive, or the like. The reinforcing stay 305 is provided with a slit 306 whose longitudinal direction is the optical axis direction of the front lens group 206. The slit 306 is provided so as to penetrate the reinforcing stay 305 in the thickness direction of the reinforcing stay 305.

  4 and 5 are exploded perspective views (part 2) and (part 3) showing the projection lens system 203. FIG. 6 and 7 are perspective views (No. 1) and (No. 2) showing the projection lens system 203. FIG. As shown in FIGS. 4 and 5, the folding lens barrel 208 has the folding lens barrel 208 fixed to the rear lens group lens barrel 207 and the above-described front lens via the focus ring 304. A group lens barrel 209 is connected.

  The focus ring 304 has a cylindrical shape with the optical axis in the optical path from the intermediate mirror 205 to the image projection mirror 210 as the axial direction, and is provided so as to be rotatable relative to the folding lens barrel 208. It has been. Although not shown in the drawings, the inner peripheral surface of the focus ring 304 and the outer peripheral surface of the front lens group barrel 209 are provided with screw threads having a pitch designed to be screwed together.

  The focus ring 304 and the front group lens barrel 209 are connected by screwing the threads of each other (see FIGS. 5 and 6). When the focus ring 304 is rotated relative to the front group lens barrel 209 in a state where the focus ring 304 and the front group lens barrel 209 are connected, the inner peripheral surface of the focus ring 304 and the front group lens are rotated. The meshing amount of the screw mechanism provided on the outer peripheral surface of the lens barrel 209 changes. Thereby, the positional relationship between the focus ring 304 and the front lens barrel 209 can be adjusted. In the embodiment, the support means is realized by a screw mechanism provided on the inner peripheral surface of the focus ring 304 and the outer peripheral surface of the front group lens barrel 209.

  Although not shown, a convex portion protruding in the outer circumferential direction is provided on the outer circumferential surface of the front lens group barrel 209. This convex portion is inserted into a concave portion (not shown) provided on the folding lens barrel 208 when the front lens group lens barrel 209 is connected to the folding lens barrel 208. As described above, when the convex portion is inserted into the concave portion, the rotation of the front lens group barrel 209 with respect to the folding barrel 208 is restricted.

  Therefore, when the focus ring 304 is rotated relative to the front group lens barrel 209 in a state where the focus ring 304 and the front group lens barrel 209 are connected, the front group lens barrel 209 is rotated. Moves in the direction of moving toward and away from the bending lens barrel 208 in the optical axis direction. Accordingly, in the rear professional television 100, the front lens group 206 can be moved in the optical axis direction as indicated by an arrow 501 in FIG.

  When the front lens group 206 is moved in the optical axis direction, the fastening screw 302 is removed from the screw hole 303 as shown in FIG. When the position of the front lens group 206 in the optical axis direction is determined, the fastening screw 302 and the screw hole 303 are screwed together via the reinforcing stay 305 as shown in FIG. In this embodiment, a fastening mechanism 601 as a fastening means is realized by a fastening screw 302 and a screw hole 303. The fastening mechanism 601 screwes the screw 302 and the screw hole 303 at a position in the plane including the optical axis and outside the front group lens 206.

  The screw 302 and the screw hole 303 are screwed together, and an urging force attracting each other acts between the reinforcing stay 305 and the rear group lens barrel 207, but the front group lens 206 is within the plane including the optical axis. When the screw 302 and the screw hole 303 are screwed together at a position on the outside, the direction in which the urging force acts is the direction in which the front lens group 206 is rotated around the optical axis. As a result, the front group lens barrel 209 is fixed to the rear group lens barrel 207 without applying a force to the front group lens 206 so that the optical axis of the front group lens 206 is tilted from the normal optical axis. can do.

  As described above, since the reinforcing stay 305 is provided with the slit 306 whose longitudinal direction is the optical axis direction of the front group lens 206, the front group lens barrel regardless of the position of the front group lens 206. 209 can be fixed to the rear lens barrel 207.

  Further, since the slit 306 is continuously opened in the optical axis direction of the front group lens 206, when the front group lens 206 is moved in the optical axis direction, the fastening screw 302 is completely removed from the screw hole 303. It is sufficient to loosen the lens barrel 209 for the front lens group as much as possible without removing it.

  In FIG. 7, an arrow indicated by reference numeral 701 represents the rotation direction of the focus ring 304. The focus ring 304 rotates around the optical axis of the front lens group 206. The rotation surface due to the rotation of the focus ring 304 is orthogonal to the optical axis of the front group lens 206. In FIG. 7, an arrow denoted by reference numeral 702 represents the screwing direction of the fastening screw 302 and the screw hole 303, that is, the fastening direction of the fastening mechanism 601. The fastening direction of the fastening mechanism 601 is parallel to the rotation surface due to the rotation of the focus ring 304 and is a direction orthogonal to the optical axis direction.

  With such a configuration, when the focus ring 304 is rotated relative to the front group lens barrel 209, the rotation of the front group lens barrel 209 with respect to the folding lens barrel 208 is restricted. Therefore, the front group lens 206 moves only in the direction in which the front group lens barrel 209 is in contact with and away from the bending lens barrel 208, that is, in the optical axis direction. The front lens group 206 is moved when the focal position of the image projected on the screen 104 is adjusted.

  By the way, when the front lens group 206 is molded by injection molding of a molten resin into a mold, a thin line (hereinafter referred to as a “weld line”) is formed at a portion where the molten resin flows and fused in the mold. May occur. When the front group lens 206 in which a weld line is generated is used, a shadow of the weld line enters the image light when passing through the front group lens 206, and a shadow of the weld line is projected onto the image projected on the screen 104. There is a concern that the quality of the image projected on the screen 104 may be reduced.

  It is assumed that image quality degradation due to the occurrence of weld lines will be regarded as important in the future in accordance with the recent demand for higher image quality. However, in general, when the front lens group 206 is molded by injection molding, in order to completely eliminate the occurrence of the weld line, the yield in manufacturing the front lens group 206 is reduced and the cost of the front lens group 206 is increased. Is concerned. It has been found that even the front lens group 206 in which a weld line is generated does not significantly affect the quality of the image projected on the screen 104 depending on the position of the weld line on the optical path.

  In the rear professional television 100 of this embodiment, since the front lens group 206 can be moved only in the optical axis direction with respect to the folding lens barrel 208, the quality of the image projected on the screen 104 is greatly affected. A convex portion provided on the outer peripheral surface of the front lens group lens barrel 209 is provided on the folding lens barrel 208 in a state where the position of the front lens group 206 is adjusted so that the weld line is positioned at a position that does not extend. By inserting the concave portion, the quality of the image projected on the screen 104 can be prevented from being lowered even when the front lens group 206 in which a weld line is generated is used.

  As described above, in the rear professional television 100 of the embodiment, since the fastening direction of the fastening mechanism 601 is a direction orthogonal to the optical axis direction, the force that causes the optical axis of the front group lens 206 to tilt from the normal optical axis. The front group lens 206 can be fastened to the rear group lens barrel 207 without acting on the front group lens 206. In the rear professional television 100 of the embodiment, the front group lens barrel 209 is fastened to the rear group lens barrel 207 without providing an actuator for preventing vibration or an electric circuit for driving the actuator. Can do.

  That is, according to the rear professional television 100 of the embodiment, the front group lens barrel 209 is used for the rear group lens without changing the optical performance of the rear professional television 100 and without increasing the number of parts and the manufacturing cost. By fastening to the lens barrel 207, the vibration of the front lens group 206 can be prevented, and the image shake caused by the vibration of the front lens group 206 can be prevented.

  Further, in the rear professional television 100 of the embodiment, the screw 302 and the screw hole 303 are screwed at a position within the plane including the optical axis and outside the front group lens 206, thereby generating the screwing. The direction in which the biasing force is applied can be a direction in which the front lens group 206 is rotated around the optical axis. As a result, the front group lens barrel 209 is fixed to the rear group lens barrel 207 without applying a force to the front group lens 206 so that the optical axis of the front group lens 206 is inclined from the normal optical axis. can do.

  In the rear professional television 100 according to the embodiment, the reinforcing stay 305 is fastened to the rear group lens barrel 207. Therefore, the rear stay lens barrel 207 is adjusted by adjusting the shape and arrangement position of the reinforcing stay 305. Regardless of the positional relationship with the front group lens barrel 209, the rear group lens barrel 207 and the front group lens barrel 209 can be fastened together. As a result, the rear professional television 100 can improve the degree of freedom in designing the rear professional television 100.

  Further, according to the rear professional television 100 of the embodiment, the rear group lens barrel 207 and the front group lens barrel 209 can be fastened with a simple configuration. The increase in the number of work processes can be suppressed.

  In addition, according to the rear professional television 100 of the embodiment, the rear group lens barrel 207 and the front group lens regardless of the position of the front group lens barrel 209 that moves in accordance with the focus adjustment operation of the front group lens 206. The lens barrel 209 can be fastened.

  Further, according to the rear professional television 100 of the embodiment, the fastening mechanism 601 can be used together without providing an adhesive for focus lock and a dedicated mechanism. This eliminates the need for, for example, an adhesive for fixing the position of the front lens group 206 or parts constituting a dedicated mechanism, and reduces the cost and manufacturing of parts compared to the case where an adhesive or a dedicated mechanism is provided. Can be reduced.

  Further, according to the rear professional television 100 of the embodiment, the fastening screw 302 screwed into the screw hole 303 can be loosened or removed, so that the rear group lens barrel 207 and the front group lens barrel 209 are temporarily provided. The focus adjustment and the focus lock can be performed again even after the connection is established. As a result, according to the rear pro television 100 of the embodiment, it is possible to improve the accuracy of focus adjustment and project a high-quality image on the screen 104.

  Further, in the rear professional television 100 of the embodiment, the rear group lens barrel 207 and the front group lens barrel 209 are fastened by screwing the fastening screw 302 and the screw hole 303, so The lens barrel 209 for the front lens group can be easily and reliably fixed to the lens barrel 207, and the work for fixing the front lens group 206 can be facilitated and the reliability for preventing image shake can be improved. it can.

  As described above, according to the projection type projection apparatus according to the present invention, the rear projection type is useful for a display apparatus for enlarging an image, and displays a large screen by a mechanism provided in a housing having a limited volume. Suitable for projection equipment.

It is a perspective view which shows the rear pro television of embodiment. It is a vertical side view which shows the rear professional television of embodiment. It is a disassembled perspective view (the 1) which shows a projection lens system. It is a disassembled perspective view (the 2) which shows a projection lens system. It is a disassembled perspective view (the 3) which shows a projection lens system. It is a perspective view (the 1) which shows a projection lens system. It is a perspective view (the 2) which shows a projection lens system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Rear projection type television 101 Housing 104 Screen 202 Image display element 206 Front group lens 207 Rear group lens barrel 209 Front group lens barrel 302 Fastening screw 303 Screw hole 305 Reinforcement stay 306 Slit 601 Fastening mechanism

Claims (6)

In a projection type projection apparatus provided in a housing with an image display element and a projection lens for enlarging and projecting an image displayed on the image display element on a screen,
It is characterized by comprising fastening means for fastening a fixing member fixed to the housing and a holding member for holding the projection lens in a direction orthogonal to the direction of the optical axis of the projection lens. Projection type projector.   2. The projection mold according to claim 1, wherein the fastening means fastens the fixing member and the holding member at a position within a plane including the optical axis and outside the projection lens. Projection device. A reinforcing stay provided on the holding member or the fixing member and extending toward the fixing member or the holding member;
The projection type projection apparatus according to claim 1, wherein the fastening means fastens the reinforcing stay to the fixing member or the holding member.   The fastening means includes a recess provided in the fixing member or the holding member and having a direction perpendicular to the optical axis direction as an axial direction, an insertion member that passes through the reinforcement stay and is inserted into the recess, The projection type projection apparatus according to claim 3, further comprising: an abutting member provided on the insertion member and abutting on the reinforcing stay from a side opposite to the concave portion with the reinforcing stay interposed therebetween. Support means for supporting the holding member so as to be movable in the optical axis direction;
A slit provided in the reinforcing stay, penetrating in a fastening direction by the fastening means, and having a longitudinal direction in the optical axis direction;
The projection type projection apparatus according to claim 4, wherein the insertion member is inserted into the recess while being inserted at an arbitrary position in the slit. 6. The projection according to claim 5, wherein the fastening means is a screw hole that is screwed into the screw hole in a state of being inserted into the screw hole and the slit provided in the fixing member or the holding member. Type projection device.

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