JP2018067001A - Structure for attaching projection optical system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to suppress position deviations of a curve mirror due to manufacturing errors of a stationary member itself or assembling errors thereof in a projection optical system in which a curve mirror holding member and a lens barrel are coupled by a stationary member.SOLUTION: A mirror holding member has: a first holding member 11; and a second holding member 12. A curve mirror 1 is held by the first holding member 11, and the first holding member 11 is held by the second holding member 12. The second holding member 12 is held by a stationary member 21, and has a first position adjustment mechanism C1 that enables a parallel movement of a position of the curve mirror 1 in a first direction orthogonal to an optical axis of the curve mirror 1 with respect to the stationary member 21, and has a second position adjustment mechanism that enables the parallel movement of the position of the curve mirror 1 in a second direction vertical to each of the optical axis of the curve mirror 1 and the first direction with respect to the stationary member 21.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a projection optical system mounting structure in which a mirror holding member that holds a curved mirror and a lens barrel are connected by a fixing member.

  A refractive optical system constituted by a lens element, a projection optical system having a configuration in which a curved mirror is disposed on the projection side of the refractive optical system, and a projector having a short projection distance using the configuration are known (for example, Patent Document 1). reference).

  Various proposals have been made as adjustment methods when the curved mirror is tilted with respect to the optical axis of the refractive optical system (see, for example, Patent Document 2).

  In addition, the refractive optical system and the curved mirror are aligned by interposing a fixing member that connects the lens barrel and the curved mirror (see, for example, Patent Document 3).

JP 2004-258620 A JP 2011-059459 A JP 2010-107778 A

  However, in the case of the configuration as in Patent Document 1, the change in optical performance with respect to the change in the angle and position of the curved mirror is large, and the accuracy of adjustment between the optical axis of the refractive optical system and the curved mirror optical axis is required.

Moreover, there are hardly any countermeasures against the shift deviation in which the optical axis of the curved mirror is shifted in the orthogonal direction with respect to the optical axis of the refractive optical system.
Although the cause of the shift is dependent on the accuracy of each part, the problem is likely to be an error during assembly when fixing the position of the lens barrel and the curved mirror on the optical axis.

  Then, as in Patent Document 3, when the refractive optical system and the curved mirror are aligned by interposing a fixing member that couples the lens barrel and the curved mirror, the coupling between the lens barrel and the fixing member is performed. The position is too far from the curved mirror. For this reason, even when the fixing member itself warps or a small amount of inclination occurs during assembly at the coupling portion, the shift deviation of the curved mirror itself relative to the optical axis of the refractive optical system increases as the distance from the coupling portion to the curved mirror increases.

  SUMMARY OF THE INVENTION An object of the present invention is to suppress a positional deviation of a curved mirror due to a manufacturing error or an assembly error of a fixed member itself in a projection optical system in which a curved mirror holding member and a lens barrel are connected by a fixed member. Is to do.

In order to solve the above problems, the invention described in claim 1
A projection optical system mounting structure in which a mirror holding member that holds a curved mirror and a lens barrel are connected by a fixing member,
The mirror holding member has a first holding member 11 and a second holding member 12,
The curved mirror 1 is held by a first holding member 11,
The first holding member 11 is held by the second holding member 12,
The second holding member 12 is held by the fixing member 21,
A first position adjustment mechanism C1 is provided that allows the fixed member 21 to translate the position of the curved mirror 1 in a first direction (X-axis direction) orthogonal to the optical axis (Z-axis) of the curved mirror 1. And
The position of the curved mirror 1 with respect to the fixed member 21 is set to a second direction (Y axis / vertical direction) perpendicular to the optical axis (Z axis) and the first direction (X axis direction) of the curved mirror 1. Having a second position adjustment mechanism that enables parallel movement to
It is characterized by that.

The invention described in claim 2
A projection optical system mounting structure in which a mirror holding member that holds a curved mirror and a lens barrel are connected by a fixing member,
The mirror holding member has a first holding member 11 and a second holding member 12,
The curved mirror 1 is held by a first holding member 11,
The first holding member 11 is held by the second holding member 12,
The second holding member 12 is held by the fixing member 21,
A first position adjusting mechanism that enables parallel movement of the position of the second holding member 12 with respect to the fixed member 21 in a first direction (X-axis direction) orthogonal to the optical axis (Z-axis) of the curved mirror 1; Have
The position of the second holding member 12 with respect to the fixing member 21 or the position of the first holding member 12 with respect to the second holding member 11, the optical axis (Z axis) of the curved mirror 1 and the first direction ( X-axis direction) and a second position adjustment mechanism that enables parallel movement in a second direction (Y-axis / vertical direction) perpendicular to each other,
It is characterized by that.

The invention according to claim 3
3. The projection optical system mounting structure according to claim 1, wherein the first position adjusting mechanism C <b> 1 extends perpendicularly to the first direction one by one at spaced positions in the first direction of the second holding member 12. An adjustment screw hole 12p formed in the flat surface portion 12n, a wall 21p formed at a position corresponding to the adjustment screw hole 12p when the second holding member 12 of the fixing member 21 is incorporated, and an adjustment It consists of an adjustment screw 26 that is screwed into the screw hole 12p.
It is characterized by that.

The invention according to claim 4
In the mounting structure of the projection optical system according to claim 3,
After the adjustment of the position of the curved mirror 1 by the first position adjustment mechanism C1, the fixing member 21 and the second holding member 12 are fixed in a direction orthogonal to the adjustment direction by the first position adjustment mechanism C1. Has a posture holding mechanism B3 for holding the adjustment state.
It is characterized by that.

The invention described in claim 5
In the mounting structure of the projection optical system according to any one of claims 1 to 4,
The second position adjusting mechanism includes a hole portion 11f formed in an extending portion 11e formed on both side surfaces on the outer peripheral side in the first direction of the first holding member 11, and a first holding member of the second holding member 12. 11 fixing screw holes 12f formed one by one at positions corresponding to the 11 holes 11f, fixing screws 13 inserted into the holes 11f and screwed into the fixing screw holes 12f, and the holes 11f. And at least one flat washer 16 disposed between the fixing screw hole portion 12f,
It is characterized by that.

The invention described in claim 6
5. The projection optical system mounting structure according to claim 1, wherein the second position adjustment mechanism is a second portion formed on a flat surface portion 12 m formed in the first direction of the second holding member 12. The hole 12k penetrating in the direction, the fixing screw hole 21k formed at a position corresponding to the hole 12k of the second holding member 12 of the fixing member 21, and the hole 12k are inserted and fixed. A fixing screw 22 screwed into the screw hole portion 21k, and at least one flat washer 25 disposed between the hole portion 12k and the fixing screw hole portion 21k.
It is characterized by that.

The other first invention is:
A projection optical system mounting structure in which a mirror holding member that holds a curved mirror and a lens barrel are connected by a fixing member,
A first engagement surface is provided on the lens barrel,
A second engagement surface is provided on the fixing member,
In a state where the first engagement surface and the second engagement surface are fixed together, the first engagement surface is positioned closer to the projection side than half of the total length of the projection optical system in the optical axis direction. Features.
Another second invention is:
Another mounting structure of the projection optical system of the first invention,
An opening is provided in the second engagement surface,
The first engaging surface and the second engaging surface are brought into contact with each other while the fixing member is overlapped with the position of the lens barrel on the optical axis so that the projection side of the lens barrel is inserted into the opening. It is characterized by that.
The other third invention is:
Another mounting structure of the projection optical system of the first or second invention,
The first engagement surface and the second engagement surface are surfaces orthogonal to the optical axis.
Another fourth invention is:
A projection optical system mounting structure according to any one of the first to third inventions,
An adjustment mechanism is provided between the first engagement surface and the second engagement surface to adjust the distance in the optical axis direction of each engagement surface.
Another fifth invention is:
A projection optical system mounting structure according to any one of the first to fourth inventions,
The fixing member is not formed closer to the main body than the second engagement surface.
Another sixth invention is:
A projection optical system mounting structure according to any one of the first to fifth inventions,
The first engagement surface is located on the projection side with respect to a position on the optical axis of an intermediate image formed inside the refractive optical system inside the lens barrel in the optical axis direction.
Another seventh invention is:
A projection optical system mounting structure according to any one of the first to sixth inventions,
The outer shapes of the first engaging portion and the second engaging portion are smaller than the maximum outer diameter of the lens barrel.

Another eighth invention is:
A projection optical system mounting structure in which a mirror holding member that holds a curved mirror and a lens barrel are connected by a fixing member,
The lens barrel is separable into a main body side lens barrel on the main body side and a projection side lens barrel on the projection side,
The fixing member is integrally provided on the projection side of the projection side lens barrel,
A third engagement surface is provided on the main body side lens barrel,
A fourth engagement surface is provided on the projection side lens barrel,
In a state where the third engagement surface and the fourth engagement surface are fixed together, the third engagement surface is positioned closer to the projection side than the half of the total length of the projection optical system in the optical axis direction. Features.

Another ninth invention is:
A projection optical system mounting structure according to another eighth invention,
The third engagement surface and the fourth engagement surface are surfaces orthogonal to the optical axis.

Another tenth invention is:
A projection optical system mounting structure according to another eighth or ninth invention,
An adjusting mechanism is provided between the third engaging surface and the fourth engaging surface to adjust the distance in the optical axis direction of each engaging surface.

Another eleventh aspect of the invention is
A projection optical system mounting structure according to another fourth or tenth aspect of the invention,
The adjusting mechanism is a washer.

Another twelfth invention is:
A projection optical system mounting structure according to any of the eighth to eleventh inventions,
The fixing member is not formed on the main body side with respect to the fourth engagement surface.

Another thirteenth invention is
A projection optical system mounting structure according to any of the eighth to twelfth inventions,
The first engagement surface and the third engagement surface are located closer to the projection side than the position on the optical axis of the intermediate image formed inside the refractive optical system inside the lens barrel in the optical axis direction. It is characterized by that.

Another fourteenth invention is
A projection optical system mounting structure according to any one of the eighth to thirteenth inventions,
An outer shape of the third engagement surface and the fourth engagement surface is smaller than a maximum outer diameter of the lens barrel.

Another fifteenth aspect of the invention is
A projection optical system mounting structure according to any one of the first to fourteenth inventions,
The mirror holding member supports the curved mirror so that the angle and position of the curved mirror can be adjusted with respect to the optical axis of the refractive optical system inside the lens barrel.

The other sixteenth invention is
A projection optical system mounting structure according to another eleventh invention,
The washer and the first engagement surface and the second engagement surface or / and the third engagement surface and the fourth engagement surface have substantially the same shape.

  According to the present invention, it is possible to suppress positional deviation of the curved mirror due to manufacturing errors and assembly errors of the fixing member itself by bringing the coupling position of the fixing member and the lens barrel closer to the curved mirror side.

FIG. 2 is an exploded perspective view showing a configuration of a curved mirror adjustment device provided in a projection optical system to which the present invention is applied, and showing a relationship between a curved mirror and a first holding member (mirror holding member) from the curved mirror side. It is the figure seen from the 1st holding member side contrary to FIG. The curved mirror of FIG.1 and FIG.2 and a 1st holding member are couple | bonded, and the relationship with a 2nd holding member (mirror holding member) is shown, The perspective view (a) seen from the 1st holding member side, It is the figure (b) seen from the other side. FIG. 4 is a perspective view (a) viewed from the adjustment screw side and a view (b) viewed from the opposite side, showing a state in which the curved mirror of FIG. 3 and the first holding member and the second holding member are coupled. . FIG. 5 is a perspective view (a) seen from the fixed member side and a view (b) seen from the opposite side, showing the relationship between the curved mirror of FIG. 4 and the first holding member and the second holding member and the fixing member. . FIG. 5 shows a relationship between the curved mirror, the first holding member, the second holding member, the fixing member, and the jig member in FIG. 5, a perspective view (a) viewed from the jig member side, and a view (b) viewed from the opposite side. ). 6 is a perspective view (a) seen from the jig member side, and a view seen from the opposite side (a), showing the coupled state of the curved mirror, the first holding member, the second holding member, the fixing member, and the jig member of FIG. b). The relationship between a curved mirror and a 1st holding member is shown, and is the schematic diagram (a) seen from the back side, and its center longitudinal cross-sectional view (b). The relationship between a curved mirror and a 1st holding member is shown, and is the schematic diagram (a) seen from the front side, and its center longitudinal cross-sectional view (b). It is a principal part vertical side view which shows the relationship of the 1st holding member with respect to a 2nd holding member. It is a principal part vertical side view which shows the relationship of the 2nd holding member with respect to a fixing member. FIG. 7 is a longitudinal side view showing an assembled state in a case where the lens barrel and the fixing member are separate types, showing the configuration of an embodiment of the projection optical system mounting structure to which the present invention is applied. FIG. 13 is an exploded view of the lens barrel and the fixing member of FIG. 12. It is the perspective view of the assembly state of FIG. 12, (a) seen from the projection side, and (b) seen from the main body side. It is the figure (a) seen from the projection side, and the figure (b) seen from the main body side. FIG. 9 is a longitudinal side view illustrating an assembled state in the case where the lens barrel and the fixing member are integrated, showing the second embodiment. FIG. 17 is an exploded view of the lens barrel and the fixing member of FIG. 16. It is the perspective view of the assembly state of FIG. 16, (a) seen from the projection side, and (b) seen from the main body side. It is the perspective view of the decomposition | disassembly state of FIG. 17, (a) seen from the projection side, and (b) seen from the main body side.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
First, a curved mirror adjustment device provided in a projection optical system to which the present invention is applied will be described.

(Curved surface mirror adjustment device)
FIG. 1 and FIG. 2 show the relationship between the curved mirror 1 and the first holding member 11 of the mirror holding member as the configuration of the curved mirror adjusting device provided in the projection optical system to which the present invention is applied. Further, the relationship between the mirror holding member and the second holding member 12 is shown, FIG. 5 further shows the relationship with the fixing member 21, and FIGS. 6 and 7 further show the relationship with the jig member 31.

  8 and 9 schematically show the relationship between the curved mirror 1 and the first holding member 11, FIG. 10 shows the relationship of the first holding member 11 with respect to the second holding member 12, and FIG. The relationship of the 2nd holding member 12 with respect to the member 21 is shown.

"Assumptions"
First, image light from the image adjusting element is incident on an image forming optical system composed of refractive optical elements, and a light beam emitted from the image forming optical system is reflected by the reflecting surface of the curved mirror 1 to the projection surface. In the projection optical system for enlarging and projecting image light, as shown in FIG. 1, the light beam of the imaging optical system is orthogonal to the Z axis and the Z axis in the plane where the locus of the light beam emitted from the image center of the image adjustment element exists. An axis to be defined is defined as a Y-axis, an axis orthogonal to the Z-axis and the Y-axis is defined as an X-axis, and directions parallel to the respective axes are defined as a Z-axis direction, a Y-axis direction, and an X-axis direction, respectively.

  When the projection optical system is installed on the ground so that the optical axis is parallel to the ground, the image adjustment element side is defined as the front side and the projection surface side is defined as the rear side in the Z-axis direction. When the front side is viewed from the rear side, the left and right sides are defined as the left side and the right side, respectively. In the Y-axis direction, the top and bottom when the rear side is viewed from the front side are defined as the upper side and the lower side, respectively. The axial direction and the vertical direction correspond to the Y-axis direction, and the front-rear direction corresponds to the Z-axis direction.

  The curved mirror 1 uses a part of an aspheric surface formed by rotating a non-circular curve with the Z axis as a rotation axis and does not include a surface on the Z axis that is a mirror axis. The optical axis of the imaging optical system and the mirror axis of the curved mirror 1 are coaxial.

"Curved mirror"
As shown in FIG. 1 and FIG. 2, groove-like engaging portions 1 a are formed on the first axis parallel to the X axis on the outer peripheral surface outside the reflecting surface of the curved mirror 1, one on each side. In the groove-like engaging portion 1a, a groove is formed from the front side to the rear side of the curved mirror 1, and the reflection surface side is open.

On the lower end side of the curved mirror 1, a projection 1b whose axis is oriented in the Y-axis direction and orthogonal to the Z-axis is formed. The protrusion 1b has a hole 1c penetrating in the front-rear direction.
Further, on the upper end portion side of the curved mirror 1, a projection 1d whose axis is directed in the Y-axis direction and orthogonal to the Z-axis is formed.

"First holding member"
As shown in FIGS. 1 and 2, a first holding member 11 is disposed on the outer peripheral side of the curved mirror 1. The first holding member 11 is formed to hold the curved mirror 1 on the inner peripheral side.
The first holding member 11 is formed with a through-hole 11a penetrating in the left-right direction at a position corresponding to the groove-shaped engaging portion 1a of the curved mirror 1. In the left and right through-holes 11a, first engaged members 2 of shaft-like members each having an axial center on a first axis parallel to the X axis are fitted. By engaging the first engaged member 2, the groove-like engaging portion 1 a is rotatably held by the first holding member 11 with the first axis as the rotation axis.

A spring washer 3 is inserted between the first engaged member 2 and the first holding member 11. The curved washer 1 is pressed against the other of the first holding members 11 together with the first engaged member 2 by the spring washer 3.
On the first holding member 11, a protrusion 11 b is formed at a position corresponding to the protrusion 1 b of the curved mirror 1. The protruding portion 11b is formed with a counterbore-shaped hole portion 11c that penetrates in the front-rear direction and has a narrow opening on the front side and has a screw hole shape. Then, the adjusting screw 4 is inserted into the hole 1c of the curved mirror 1 and the hole 11c of the first holding member 11 from the rear side, and is screwed into the screw hole of the hole 11c. A compression spring 5 is inserted into the hole 11c from the rear side.

  In the first holding member 11, a position adjusting groove 11 d is formed at a position corresponding to the protrusion 1 d of the curved mirror 1. The position adjusting groove 11d has a groove width in the left-right direction larger than the diameter of the protrusion 1d, and the depth of the groove in the front-rear direction is substantially equal to the diameter of the protrusion 1d. Then, after the protrusion 1d is inserted into the position adjusting groove 11d from the rear side of the first holding member 11, the protrusion 1d is positioned by the leaf spring 7 fixed with the screw 6 from the rear side of the position adjusting groove 11d. It is pressed against the front wall surface which is the bottom of the adjusting groove 11d.

  At the upper end of the first holding member 11, one end of two leaf springs 8 is fixed with screws 9 at positions separated in the left-right direction. The other end of the leaf spring 8 projects forward from the front end portion of the first holding member 11 and biases the upper end portion of the outer peripheral portion of the curved mirror 1 inside the first holding member 11.

  Therefore, as shown in FIGS. 8 and 9, the curved mirror 1 is adjusted by adjusting the adjustment screw 4 while holding the curved mirror 1 with respect to the first holding member 11 via the first engaged member 2. The first angle adjusting mechanism A1 is configured to be rotatable with respect to the first holding member 11 about the first axis (X) as a rotation axis. By this first angle adjustment mechanism A1, the angle adjustment and fixing of the reflection surface of the curved mirror 1 are possible.

  Further, the spring washer 3 suppresses backlash in the X-axis direction, the leaf spring 7 suppresses the fall of the curved mirror 1 from the first engaged member 2 and backlash in the Z-axis direction, and the leaf spring 8 suppresses the backlash in the Y-axis direction. 1st attitude | position holding mechanism B1 which suppressed this rattling is comprised.

Furthermore, one extending portion 11e is formed on each side surface of the first holding member 11 on the outer peripheral side in the left-right direction. The extended portion 11e is formed with an elongated hole portion 11f that penetrates in the vertical direction and has a larger diameter in the front-rear direction than in the left-right direction.
One extending portion 11g extending downward is formed at each rear end of the two extending portions 11e. The extending portion 11g is formed with a hole portion 11h penetrating in the Z-axis direction.

  An adjustment hole 11 i is formed at the upper end of the first holding member 11. The central axis of the adjustment hole portion 11i is in the Y-axis direction orthogonal to the Z-axis, and the intersection of the central axis and the Z-axis is connected near the front surface of the curved mirror 1.

"Second holding member"
As shown in FIG. 3, the second holding member 12 is disposed on the back side of the first holding member 11. The second holding member 12 is formed to be able to hold the first holding member 11 holding the curved mirror 1 on the inner peripheral side.
In the second holding member 12, one fixing screw hole portion 12 f is formed on the left and right sides at a position corresponding to the hole portion 11 f of the first holding member 11. The fixing screw hole portion 12f is formed at the axial center of the protruding portion 12e protruding on the end portion of the second holding member 12 in the Y-axis direction.
The movement of the first holding member 11 is restricted with respect to the second holding member 12 by inserting the fixing screw 13 into the hole portion 11f and screwing it into the fixing screw hole portion 12f.

  When connecting with the fixing screw 13, the spring washer 14 and the flat washer 15 are first fitted into the fixing screw 13, and the flat washer 16 is sandwiched between the first holding member 11 and the second holding member 12. Then, the fixing screw 13 is screwed into the fixing screw hole 12f.

  The second holding member 12 is formed with one left and right hole 12 h at a position corresponding to the hole 11 h of the first holding member 11. The hole portion 12h has a rear opening having a large diameter, but the front opening has a small diameter and has a counterbore shape that is a screw hole shape. Further, as shown in FIG. 10, a compression spring 18 is inserted into the hole 12h from the rear side.

  As shown in FIG. 4, the adjusting screw 17 is inserted into the hole portion 11h, the compression spring 18, and the hole portion 12h from the rear side, and the adjusting screw 17 is screwed into the screw hole portion of the hole portion 12h.

  In addition, two adjustment jigs are located at the rear end of the second holding member 12 coaxially with the hole 12h in the left-right direction and closer to the optical axis of the curved mirror 1 than the hole 12h. A fixed portion 12j is formed.

  Therefore, as shown in FIGS. 6 and 7, the jig member 31 is fixed to the adjustment jig fixing portion 12j from the back surface with a pair of jig fixing screws 32, and the protrusion 31i formed on the jig member 31 is fixed. By engaging with the adjustment hole 11i formed in the first holding member 11, the first holding member 11 is rotatable about a central axis parallel to the Y axis of the adjustment hole 11i as a rotation axis, and Translation is restricted.

  Therefore, as shown in FIG. 10, the second angle adjusting mechanism A <b> 2 that adjusts the angle of the first holding member 11 with respect to the second holding member 12 with the second axis (Y) as the rotation center by the adjusting screw 17. Is configured.

  In addition, the second posture holding mechanism B2 that can hold the adjusted posture by adjusting the angle of the reflecting surface of the curved mirror 1 and then tightening the fixing screw 13 is configured.

  Here, the jig member 31 may be removed after the first holding member 11 has been adjusted with respect to the second holding member 12, or may be left as a reinforcing member.

  Further, as shown in FIG. 3, the second holding member 12 has one hole on each of the left and right sides at a position that is coaxial with the projecting portion 12 e and spaced forward from the projecting portion 12 e in the front-rear direction. 12k is formed. The hole portion 12k has a long hole shape that penetrates in the vertical direction and has a larger diameter in the left-right direction than in the front-rear direction.

  Further, the flat surface portion 12m in which the hole portion 12k of the second holding member 12 is formed has a flat surface portion 12n extending in the downward direction perpendicular to the edge portion spaced from the optical axis in the left-right direction. The planar portion 12n is formed with an adjustment screw hole portion 12p that is coaxial with the hole portion 12k in the left-right direction and penetrates in the left-right direction.

  In this way, the curved mirror 1, the first holding member 11, and the second holding member 12 that are fixedly held after adjusting the angle and position of the reflecting surface are combined to form a reflecting surface holding mechanism.

`` Fixing member ''
As shown in FIG. 5, a fixing member 21 is disposed on the lower surface side of the reflection surface holding mechanism. The fixing member 21 is formed on the inner peripheral side so as to be able to hold the reflecting surface holding mechanism. The reflection surface holding mechanism is disposed at the rear end portion of the fixing member 21.
The fixing member 21 has fixing engaging portions 21a for fixing to a lens barrel (not shown) that includes an imaging optical system using a refractive optical element, at both left and right ends of the front side.

The fixing member 21 is formed with fixing screw holes 21k on the left and right sides at positions corresponding to the holes 12k of the second holding member 12. The fixing screw hole 21k is formed in the axial center of the protruding portion 21b protruding on the end portion of the fixing member 21.
The movement of the second holding member 12 is restricted with respect to the fixing member 21 by inserting the fixing screw 22 into the hole portion 12k and screwing it with the fixing screw hole portion 21k.

  When connecting with the fixing screw 22, the spring washer 23 and the flat washer 24 are first fitted into the fixing screw 22, and the flat washer 25 is sandwiched between the second holding member 12 and the fixing member 21. The screw 22 is screwed into the fixing screw hole 21k.

  The fixing member 21 has a wall portion 21p that is a wall surface and has no hole at a position corresponding to the adjustment screw hole portion 12p of the second holding member 12. When the adjustment screw 26 is screwed into the adjustment screw hole portion 21p, the adjustment screw 26 penetrates the adjustment screw hole portion 12p, and the tip portion pushes the wall portion 21p of the fixing member 21.

  Therefore, as shown in FIG. 6, the first position adjusting mechanism C <b> 1 that adjusts the position of the reflecting surface by moving the second holding member 12 in the X-axis direction with respect to the fixing member 21 with the adjusting screw 26. Is configured.

  Further, as shown in FIG. 11, the third posture holding mechanism B3 that can hold the post-adjustment posture by tightening the fixing screw 22 after the position of the reflecting surface is determined is configured. .

  As described above, the adjusting device for the curved mirror 1 includes the first angle adjustment mechanism A1 having the first axis (X) as the rotation center, the second angle adjustment mechanism A2 having the second axis (Y) as the rotation center, 1 posture holding mechanism B1, 2nd posture holding mechanism B2, 3rd posture holding mechanism B3, and 1st position adjustment mechanism C1 to the 1st axis (X) direction are provided.

  As described above, according to the adjusting device for the curved mirror 1, the first angle adjusting mechanism A1, the second angle adjusting mechanism A2, the first attitude holding mechanism B1, the second attitude holding mechanism B2, the third attitude holding mechanism B3, and the first angle adjusting mechanism A2. By providing the position adjustment mechanisms C1 independently of each other, the angle, posture, and position of the reflecting surface can be independently adjusted, and can be easily adjusted with higher accuracy.

(Modification 1)
In addition, the washer 16 between the first holding member 11 and the second holding member 12 and / or the flat washer 25 between the second holding member 12 and the fixing member 21 changes the thickness of the washer and the number of sandwiched pieces. Thus, it is possible to provide a function as a second position adjusting mechanism capable of adjusting the position of the reflecting surface in the vertical direction.

  At that time, since there are two height adjustment mechanisms on the same axis in the X-axis direction and spaced apart in the left-right direction, the number and thickness of washers sandwiched between the two can be made different from those of the other. It is also possible to rotate the reflecting surface about the axis.

(Modification 2)
In the above adjusting apparatus, the axis orthogonal to the optical axis is the first axis, the axis orthogonal to the optical axis, and the axis orthogonal to the first axis is the second axis. An axis parallel to the axis to be aligned may be a first axis, an axis orthogonal to the optical axis and an axis parallel to the axis orthogonal to the first axis may be the second axis.
Furthermore, it is needless to say that other specific detailed structures can be appropriately changed.

Next, an embodiment of the present invention will be described.
In the following embodiments, the same members as those described in the above-described curved mirror adjustment device are denoted by the same reference numerals.

(Embodiment 1)
This embodiment corresponds to the case where the fixing member 21 and the lens barrel are separate members.

  FIGS. 12 to 15 show a case where the lens barrel and the fixing member are separate as a configuration of an embodiment of the projection optical system mounting structure to which the present invention is applied. As described in the above-described curved mirror adjustment device, FIGS. Reference numeral 1 denotes a curved mirror, 21 denotes a fixing member, 41 denotes a projection side lens barrel, and 42 denotes a main body side lens barrel.

In the embodiment, as shown in the figure, the projection optical system composed of the refractive optical system and the curved mirror 1, the lens barrels 41 and 42 including the refractive optical system, and the angle and position of the curved mirror 1 are finely adjusted. A projection optical system having mirror holding members 11 and 12 that are supported in an adjustable manner, and a lens barrel that includes the projection optical system.
The fixing member 21 connects the lens barrels 41 and 42 and the mirror holding members 11 and 12 to define and fix the position of the curved mirror 1 with respect to the lens barrels 41 and 42 in the optical axis direction.

The lens barrels 41 and 42 and the fixing member 21 are fixed as follows.
That is, as shown in FIGS. 13 and 15, the lens barrels 41 and 42 are formed with a first engagement surface 41 </ b> A, and the fixing member 21 is formed with a second engagement surface 21 </ b> A.
The first engagement surface 41A and the second engagement surface 21A are fixed with screws, screws, or the like in a state of being combined in the facing state, as shown in FIGS.

Here, the first engagement surface 41A and the second engagement surface 21A are planes orthogonal to the lens optical axis. As shown in FIG. 12, the first engagement surface 41A is a projection optical device in the optical axis direction. It is located on the projection side rather than half the total length of the system.

Specifically, the lens barrel is configured by fixing the projection side lens barrel 41 and the main body side lens barrel 42 via screws, screws, or the like.
A first flange portion 41F in the direction orthogonal to the optical axis is formed on the outer peripheral surface of the main body side end portion of the projection side lens barrel 41. The projection side end surface of the first flange portion 41F is a first engagement surface 41A.

In addition, a second flange portion 21 </ b> F perpendicular to the optical axis is formed at the main body side end of the fixing member 21. The main body side end surface of the second flange portion 21F is a second engagement surface 21A.
Further, as shown in FIG. 15, a circular opening 21B is formed in the second flange portion 21F.

  Here, the maximum outer diameters of the first flange portion 41F and the second flange portion 21F described above are smaller than the maximum outer diameter of the lens barrels 41 and 42 as shown in the figure, and the engagement surfaces 41A and 21A have Each has a plurality of screw hole portions for fixing the lens barrel formed in a direction parallel to the optical axis.

  As described above, the mirror holding members 11 and 12 include the curved mirror 1, and the curved mirror 1 can be rotated about two axes that are orthogonal to the optical axis, respectively. It can be fixed while maintaining its posture in a state, and can also be shifted in each axial direction.

As described above, the fixing member 21 in which the mirror holding members 11 and 12 are fixed to one of the front ends has the second engagement surface 21A formed at the other end of the first flange portion of the projection side lens barrel 41. It is made to face 41 A of 1st engagement surfaces formed in the projection side of 41F.
Then, the projection side lens barrel 41 is inserted into the opening 21B of the second engagement surface 21A from the main body side, and the first engagement surface 41A and the second engagement surface 21A are in contact with each other with screws or screws. By being fixed, the fixing member 21 is attached to the lens barrels 41 and 42.

  In the above, the first engagement surface 41A of the projection-side lens barrel 41 and the second engagement surface 21A of the fixing member 21 are arranged inside when the lens barrels 41 and 42 are engaged to form a barrel. With respect to the total length of the projection optical system formed by the refracting optical system and the curved mirror 1 arranged on the projection side of the lens barrels 41 and 42, the projection optical system is arranged at least on the projection side.

  Here, as specific numerical values, for example, the total length of the refractive optical system is 115.1 mm, the total length of the projection optical system is 176.1 mm, and the length 89 on the optical axis from the lens surface closest to the main body to the first engagement surface 41A is 89. .6 mm, and the length on the optical axis from the first engagement surface 41A to the surface of the curved mirror 1 is 86.5 mm.

  When the projection optical system is attached to the projector main body and image light from the light valve installed on the main body side is incident on the projection optical system, the refraction of the refractive optical elements of a part of the refractive optical system in the projection optical system By the action, as shown in FIG. 12, the first intermediate image P1 is formed by forming an image once in the refractive optical system.

  Further, when the second intermediate image is formed by forming an image between the refractive optical system and the curved mirror 1 by the refraction action of the other refractive optical elements of the refractive optical system, the projection side is closer to the first intermediate image P1. First engagement surface 41A and second engagement surface 21A are arranged.

  Here, as a specific numerical value, for example, the length on the optical axis from the lens surface closest to the main body to the first intermediate image P1 is 68.1 mm.

  As shown in FIGS. 13 and 15, the opening of the second engagement surface 21 </ b> A is provided between the first engagement surface 41 </ b> A of the projection side lens barrel 41 and the second engagement surface 21 </ b> A of the fixing member 21. At least one washer 43 having an opening having substantially the same shape as 21B is inserted.

The washer 43 constitutes a position (distance) adjusting mechanism, and has a plurality of types having specific thicknesses ranging from 0.01 to 0.10 mm, for example.
The position (distance) in the optical axis direction between the lens barrels 41 and 42 and the fixing member 21 can be adjusted by replacing the washer 43 or adjusting the thickness by inserting one or more sheets. ing.

  As described above, according to the projection optical system mounting structure in which the mirror holding members 11 and 12 and the lens barrels 41 and 42 of the curved mirror 1 of the embodiment are connected by the fixing member 21, the first engagement of the lens barrels 41 and 42 is achieved. Since the first engagement surface 41A is positioned closer to the projection side than the half of the entire length of the projection optical system in the optical axis direction in a state where the mating surface 41A and the second engagement surface 21A of the fixing member 21 are fixed together, the fixed The coupling position of the member 21 and the lens barrels 41 and 42 can be made closer to the curved mirror 1 side, and the positional deviation of the curved mirror 1 due to the manufacturing error and assembly error of the fixing member 21 itself can be suppressed.

(Embodiment 2)
The second embodiment corresponds to the case where the fixing member 21 and the projection side lens barrel 41 are integrally molded.

  FIGS. 16 to 19 show a case where the lens barrel and the fixing member are integrated as Embodiment 2, and like Embodiment 1, 1 is a curved mirror, 21 is a fixing member, and 41 is a projection side lens barrel. , 42 are main body side lens barrels.

  That is, in the second embodiment, as shown in FIGS. 17 and 19, the projection-side lens barrel 41 and the fixing member 21 are connected to the first engagement surface 41 </ b> A and the second engagement surface 41 </ b> A of the first flange portion 41 </ b> F in the first embodiment described above. The flange portion 21F is integrally molded in a shape when it comes into contact with the second engagement surface 21A.

  Here, in the case where the fixing member 21 and the projection side lens barrel 41 are integrally formed, a part of the lower portion of the fixing member 21 is notched for convenience of manufacture, and the notch portion appears in FIG. Absent.

  A third flange portion 42F in the direction orthogonal to the optical axis is formed on the outer peripheral surface of the projection side end portion of the main body side lens barrel 42. The projection side end surface of the third flange portion 42F is a third engagement surface 42A.

  Further, a fourth flange portion 44F in a direction orthogonal to the optical axis is formed on the outer peripheral surface of the main body side end portion of the projection side lens barrel 41. The end surface on the main body side of the fourth flange portion 44F is a fourth engagement surface 44A.

  Here, the maximum outer diameters of the third flange portion 42F and the fourth flange portion 44F described above are smaller than the maximum outer diameter of the lens barrels 41 and 42, as shown in the drawing, And a plurality of screw hole portions for fixing the lens barrel formed in a direction parallel to the optical axis.

The above lens barrels 41 and 42 are fixed as follows.
That is, the fourth engagement surface 44A of the fourth flange portion 44F of the projection side lens barrel 41 integral with the fixing member 21 and the third engagement surface 42A of the third flange portion 42F of the main body side lens barrel 42 are provided. Fix with screws or screws in contact with each other.

  In the above, the fourth engagement surface 44A of the projection side lens barrel 41 integrated with the fixing member 21 and the third engagement surface 42A of the main body side lens barrel 41 engage the lens barrels 41 and 42, respectively. More than at least half of the total length of the projection optical system formed by the refractive optical system arranged inside the lens barrel and the curved mirror 1 arranged on the projection side of the lens barrels 41 and 42. Arranged on the projection side.

  Here, as specific numerical values, for example, the total length of the refractive optical system is 115.1 mm, the total length of the projection optical system is 176.1 mm, and the length 92 on the optical axis from the lens surface closest to the main body to the third engagement surface 42A. .1 mm, 84 mm on the optical axis from the third engagement surface 42A to the surface of the curved mirror 1

  Further, when the second intermediate image is formed by forming an image between the refractive optical system and the curved mirror 1 by the refraction action of the other refractive optical elements of the refractive optical system, the projection side is closer to the first intermediate image P1. The third engagement surface 43A and the fourth engagement surface 44A are arranged on the front.

  Here, as a specific numerical value, for example, the length on the optical axis from the lens surface closest to the main body to the first intermediate image P1 is 68.1 mm.

  Then, a washer 45 is inserted between the third engagement surface 42A and the fourth engagement surface 44A as shown in FIGS.

The washer 45 constitutes a position (distance) adjustment mechanism, similar to the washer 43 of the first embodiment. Specific types of numerical values include, for example, a plurality of types having different thicknesses between 0.01 and 0.10 mm. have.
By changing the thickness by replacing the washer 45 or adding one or more of the washer 45, the optical axis direction of the projection side lens barrel 41 and the main body side lens barrel 42 integrated with the fixing member 21 is adjusted. The position (distance) can be adjusted.

  As described above, according to the projection optical system mounting structure in which the mirror holding members 11 and 12 of the curved mirror 1 and the lens barrels 41 and 42 of the second embodiment are connected by the fixing member 21, the third lens barrel 42 of the main body side is used. In a state in which the engagement surface 42A and the fourth engagement surface 44A of the projection-side lens barrel 41 integrated with the fixing member 21 are combined and fixed, the third engagement surface 42A has the entire length of the projection optical system in the optical axis direction. Since the projection side lens barrel 41 and the main body side lens barrel 42 integrated with the fixing member 21 are positioned closer to the projection side than the half, the manufacturing error of the fixing member 21 itself is caused. Further, the positional deviation of the curved mirror 1 due to the assembly error can be suppressed.

(Other variations)
Needless to say, in addition to the above-described embodiments, specific detailed structures and the like can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Curved surface mirror 2 1st to-be-engaged member 3 Spring washer 4 Adjustment screw 5 Compression spring 6 Screw 7 Leaf spring 8 Leaf spring 9 Screw 11 Mirror holding member 12 Mirror holding member 13 Fixing screw 14 Spring washer 15 Flat washer 16 Flat Washer 17 Adjustment screw 18 Compression spring 21 Fixing member 21A Second engagement surface 21B Opening 21F Second flange 22 Fixing screw 23 Spring washer 24 Flat washer 25 Flat washer 26 Adjustment screw 31 Jig member 32 Fixing screw 41 Projection side lens barrel 41A First engagement surface 41F First flange portion 42 Main body side lens barrel 42A Third engagement surface 42F Third flange portion 43 Distance adjustment mechanism (washer)
44A Fourth engagement surface 44F Fourth flange portion 45 Distance adjustment mechanism (washer)
A1 First angle adjustment mechanism A2 Second angle adjustment mechanism B1 First attitude holding mechanism B2 Second attitude holding mechanism B3 Third attitude holding mechanism C1 First position adjustment mechanism

Claims (6)

A projection optical system mounting structure in which a mirror holding member that holds a curved mirror and a lens barrel are connected by a fixing member,
The mirror holding member has a first holding member and a second holding member,
The curved mirror is held by the first holding member;
The first holding member is held by the second holding member,
The second holding member is held by the fixing member,
A first position adjusting mechanism that enables parallel movement of the position of the curved mirror in a first direction perpendicular to the optical axis of the curved mirror with respect to the fixing member;
A second position adjusting mechanism that allows the position of the curved mirror to translate in a second direction perpendicular to the optical axis of the curved mirror and the first direction with respect to the fixing member; ,
A projection optical system mounting structure characterized by that. A projection optical system mounting structure in which a mirror holding member that holds a curved mirror and a lens barrel are connected by a fixing member,
The mirror holding member has a first holding member and a second holding member,
The curved mirror is held by the first holding member;
The first holding member is held by the second holding member,
The second holding member is held by the fixing member,
A first position adjustment mechanism that enables translation of the position of the second holding member with respect to the fixing member in a first direction orthogonal to the optical axis of the curved mirror;
The position of the second holding member with respect to the fixing member or the position of the first holding member with respect to the second holding member with respect to the optical axis of the curved mirror and the first direction, respectively. Having a second position adjustment mechanism that enables translation in a vertical second direction;
A projection optical system mounting structure characterized by that. 3. The projection optical system mounting structure according to claim 1, wherein the first position adjusting mechanism is perpendicular to the first direction one by one at spaced positions in the first direction of the second holding member. An adjustment screw hole formed in the extended flat portion, a wall formed at a position corresponding to the adjustment screw hole when the second holding member of the fixing member is incorporated, and the adjustment Consists of adjusting screws that screw into the screw holes.
A projection optical system mounting structure characterized by that. In the mounting structure of the projection optical system according to claim 3,
After adjusting the position of the curved mirror by the first position adjustment mechanism, the first position adjustment is performed by fixing the fixing member and the second holding member in a direction orthogonal to the adjustment direction by the first position adjustment mechanism. It has a posture holding mechanism that holds the adjustment state by the mechanism,
A projection optical system mounting structure characterized by that. In the mounting structure of the projection optical system according to any one of claims 1 to 4,
The second position adjusting mechanism includes a hole formed in an extending portion formed on both side surfaces on the outer peripheral side in the first direction of the first holding member, and the first holding member of the second holding member. A fixing screw hole formed one by one at a position corresponding to the hole, a fixing screw inserted into the hole and screwed into the fixing screw hole, the hole and the fixing Consisting of at least one flat washer arranged between the screw holes for
A projection optical system mounting structure characterized by that. 5. The projection optical system mounting structure according to claim 1, wherein the second position adjusting mechanism is a second portion formed in a flat portion formed in a first direction of the second holding member. A hole penetrating in the direction of the fixing member, a fixing screw hole formed one by one at a position corresponding to the hole of the second holding member of the fixing member, and the fixing member inserted into the hole A fixing screw screwed into the screw hole, and at least one flat washer disposed between the hole and the fixing screw hole.
A projection optical system mounting structure characterized by that.

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