JP2003172975A - Casing for optical components, optical unit, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casing for optical components which prevents distortion of a mirror and adjusts the direction of an incident plane of a mirror independently to the direction of biaxial rotating, an optical unit, and a projector. <P>SOLUTION: A mirror holding member 60 is provided with a mirror holding frame which holds a dichroic mirror 421 universally in rotation which changes the angle of the incident plane of the dichroic mirror 421, first leaf spring which energizes the dichroic mirror 421 to a rotating direction to the mirror holding frame, and second leaf spring 68 which energizes the mirror holding frame to a rotating direction which an axis of a vertical direction is a center of rotation to a light guide main body 2. An elevation angle adjusting screw 70 which presses the dichroic mirror 421 from an opposite side of the energizing direction of the first leaf spring 67, and a right and left rotation adjusting screw 80 which presses the mirror holding frame from an opposite side of the energizing direction of the second leaf spring 68 are provided on the light guide main body 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for optical parts,
The present invention relates to an optical unit and a projector.

[0002]

2. Description of the Related Art Conventionally, as a projector, a light beam emitted from a light source is converted into RGB by a dichroic mirror.
The three color lights are separated, each color light is modulated by three liquid crystal panels according to the image data, and the modulated light beams are combined by the cross dichroic prism, and the color image is displayed on the screen through the projection lens. A so-called three-panel type for enlarging and projecting is known.

[0003]

However, in such a projector, for example, in a dichroic mirror arranged on the optical path, if the accuracy is varied or the position is deviated, the dichroic mirror is incident on the dichroic mirror. When the position of the illumination optical axis of the reflected light with respect to the illumination optical axis of the transmitted light deviates from the designed illumination optical axis position in the light flux separated into the reflected light reflected on the incident surface and the transmitted light transmitted through the incident surface. There is. In this case, the irradiation area in the liquid crystal panel installed for each color light is shifted, the effective irradiation area where each color light is effectively combined becomes small, and a part of the incident light is used for image projection. There was a problem that it was wasted. Therefore, it is necessary to adjust the direction (tilt) of an optical component such as a dichroic mirror in order to increase the effective irradiation area and effectively utilize the light flux.

Therefore, as a technique for adjusting the direction of the incident surface of the mirror, for example, Japanese Patent Laid-Open No. 2000-21436.
There are publications such as No. 3 publication. According to the technique of this publication, a mirror is arranged along the side surface of the housing via the elastic member, and the left and right end portions and the lower surface of the surface (light incident surface) of the mirror opposite to the elastic member. By providing the housing with pin-shaped cams that come into contact with the mirror at three points on the side end, and the elastic member expands and contracts in the direction in which the housing side surface and the mirror face each other according to the operation of these cams. The direction of the incident surface of the mirror can be adjusted independently in the biaxial rotation directions centering on the vertical axis and the horizontal axis passing through the substantially central portion of the mirror. However, in such a case, the cam directly urges the mirror, so that the mirror is apt to be distorted or damaged. There is also a problem that the adjustment position is likely to change.

An object of the present invention is to provide a housing for optical components, an optical unit, and a projector that can suppress the distortion of the mirror and independently adjust the direction of the incident surface of the mirror in the biaxial rotation direction. To do.

[0006]

An optical component casing according to the present invention accommodates a plurality of optical components including a mirror, and these plurality of optical components are provided with a predetermined illumination optical axis defined in a plane. An optical component housing arranged on the top, comprising a mirror holding member for holding the mirror, and a housing body for housing other optical components, the mirror holding member being a plane including the illumination optical axis. And a mirror holding frame for rotatably holding the mirror so that the angle formed by the incident surface of the mirror can be changed, and the mirror holding frame is provided on the mirror holding frame and biases the mirror in the rotational direction with respect to the mirror holding frame. A first biasing member and a second biasing member that biases the mirror holding frame in a rotation direction about a normal line of a plane including the illumination optical axis with respect to the optical component casing. Urging of the first urging member to the housing body A first adjusting member for adjusting a rotational position of the mirror by pressing the mirror from the side opposite to the direction,
A second adjusting member for pressing the mirror holding frame from the side opposite to the urging direction of the second urging member to adjust the rotational position of the mirror holding frame is provided.

Here, the predetermined illumination optical axis defined in a plane means, for example, a one-dot chain line in the figure when the optical component casing is viewed in a plane as shown in FIG. 1 described later. Z
Is the illumination optical axis. The angle formed by the plane including the illumination optical axis and the incident surface of the mirror is the tilt angle of the incident surface of the mirror with respect to the plane including the illumination optical axis, that is, the elevation angle. From the above, the rotation axis of the entrance surface of the mirror is an axis parallel to the plane including the illumination optical axis, for example, an axis parallel to the plane including the illumination optical axis and parallel to the entrance surface of the mirror (horizontal axis and Can be adopted.

The rotation direction about the normal line of the plane including the illumination light axis is the in-plane rotation direction in the plane including the illumination light axis. That is, the rotation axis of the mirror holding frame is the normal line of the plane including the illumination optical axis. At this time, by arranging the mirror to rotate following the rotation of the mirror holding frame, this normal line becomes the rotation axis (referred to as a vertical axis) of the mirror. From the above, the mirror is configured to be rotatable with the horizontal axis and the vertical axis, which are orthogonal to each other, as the rotation axes.

As the first urging member and the second urging member, various kinds of urging members such as leaf springs, coil springs, rubber and resin can be adopted. The mirror to be adjusted includes a general reflection mirror and a dichroic mirror that transmits a part of incident light.

According to such an invention, for example, the rotational position (direction) of the incident surface of the mirror is adjusted by the following procedure. (1) The mirror to be adjusted is held by the mirror holding frame of the mirror holding member while being rotatable about the horizontal axis described above. (2) Attach the first biasing member to the mirror holding frame. At this time, the first urging member is attached to the mirror holding frame so as to urge the mirror in the rotation direction about the horizontal axis. (3) Attach the second biasing member to the mirror holding frame. (4) The mirror holding member configured by attaching the first and second biasing members is rotatable in the in-plane rotation direction about the vertical axis as a rotation axis, and is positioned at a predetermined position of the housing body. To place. At this time, the second biasing member is arranged so as to bias the mirror holding frame in the in-plane rotation direction described above with respect to the optical component casing.

(5) The first adjusting member is arranged on the housing body.
At this time, the first adjusting member is arranged so as to press the mirror from the side opposite to the urging direction of the first urging member. Therefore,
Since the first biasing member expands and contracts by the pressing of the mirror by the first adjusting member, it is possible to adjust the rotational position of the mirror about the horizontal axis, that is, the elevation angle of the incident surface of the mirror. (6) The second adjusting member is arranged on the housing body. At this time, the second
The adjusting member is arranged so as to press the mirror holding frame from the side opposite to the urging direction of the second urging member. Therefore, since the second biasing member expands and contracts by the pressing of the mirror holding frame by the second adjusting member, it is possible to adjust the rotational position of the mirror holding frame in the in-plane rotation direction described above. At this time, the position of the entrance surface of the mirror in the in-plane rotation direction can be adjusted by rotating the mirror following the rotation of the mirror holding frame.

In order to perform the adjustment in the above-described procedure, the incident surface of the mirror is independently adjusted from the outside of the housing body with two axes (the above-mentioned horizontal axis and the vertical axis) orthogonal to each other as rotation centers. it can. Further, the second adjusting member urges the mirror holding frame of the mirror holding member,
Since the direction of the incident surface of the mirror is adjusted, it is possible to effectively prevent the damage or distortion of the mirror surface as compared with the case where the mirror surface is directly biased.

In the optical component casing as described above, it is preferable that the first adjusting member and the second adjusting member are attached to the casing body by a screw structure. With such a screwing structure, since the screwing condition can be slightly changed, it is possible to finely adjust the degree of biasing by each adjusting portion,
The direction of the incident surface of the mirror can be adjusted more accurately, and the adjusted position can be stably held.

In the optical component casing as described above, the mirror is provided with an abutting portion attached to the mirror in correspondence with the biasing position of the first biasing member and contacting the first biasing member. Is preferred. With such a configuration, the first
The biasing member does not directly bias the mirror, but biases the contact portion attached to the mirror to indirectly bias the mirror. For this reason, it is possible to more effectively prevent the occurrence of damage or distortion of the mirror surface.

Further, it is preferable that a rotation axis about which the mirror rotates with respect to the mirror holding frame is set within a plane including an entrance surface of the mirror. Further, it is preferable that the rotation axis of the mirror holding frame is set within a plane including the incident surface of the mirror. In such cases,
Since each rotation axis is set on the incident surface of the mirror, the incident surface of the mirror can be always arranged in the designed optical path position, and the adjustment work becomes easy.

Further, it is preferable that the second urging member is constructed so as to transmit a reaction force to the housing body. With this configuration, the spatial position of the housing body, the second biasing member, and the mirror holding member can be fixed at a fixed position at all times.

Here, conventional Japanese Patent Laid-Open No. 2000-21436.
The technique disclosed in Japanese Patent No. 3 has a problem that the mirror is unstable because the mirror is not fixed in particular after adjusting the direction of the mirror. Therefore, even if the mirror is fixed to the housing by adhesion or the like, it is difficult to readjust the mirror direction this time. Therefore, it is preferable that the optical component casing as described above be provided with a fixing member for screwing and fixing the mirror holding frame to the casing body. In such a case, for example, by screwing and fixing the mirror holding frame to the housing body with a shaft-shaped member or the like, after adjusting the rotational position of the mirror holding frame and adjusting the direction of the incident surface of the mirror, The posture of the mirror after adjustment can be reliably maintained without the need for adhesive fixing with an adhesive or the like. At this time, since it is fixed by screwing instead of adhesive fixing,
The direction of the entrance surface of the mirror can be easily readjusted.

An optical unit according to the present invention is characterized by including the optical component casing as described above and the mirror. According to such an invention, it is possible to achieve the same actions and effects as those of the optical component casing described above, and it becomes possible to project an optical image of high brightness and high quality.

In such an optical unit, it is preferable that the mirror is a dichroic mirror that transmits a part of incident light. With such a configuration, each member such as the first adjusting member, the second adjusting member, the first elastic member, and the second elastic member can be arranged so as not to be located on the main part of the exit surface of the mirror, and the incident light It is also suitable for a dichroic mirror that transmits a part.

A projector according to the present invention is characterized by being provided with the optical component casing or the optical unit. According to such an invention, it is possible to achieve the same actions and effects as those of the optical component casing and the optical unit described above, and it is possible to project a high-luminance and high-quality image.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. [1. Configuration of Optical Unit of Projector] FIG. 1 is a schematic view showing a part of a projector 1 according to the present invention in plan view. The projector 1 is configured to include an optical unit 4 that is substantially L-shaped in a plane and accommodated in a resin-made exterior case (not shown) that is configured in a substantially rectangular parallelepiped shape. The optical unit 4 is a unit that optically processes the light flux emitted from the light source lamp 411 to form an optical image corresponding to image information, and includes an integrator illumination optical system 41, a color separation optical system 42, and The relay optical system 43 and the electro-optical device 4
4, a cross dichroic prism 45 as a color combining optical system, and a projection lens 46 as a projection optical system.

As shown in FIG. 1, the light source lamp 41
The light flux emitted from 1 travels as indicated by a chain line Z in the figure. An alternate long and short dash line Z on this FIG. 1 indicates a predetermined illumination optical axis defined in a plane in the claims.

The integrator illumination optical system 41 includes three liquid crystal panels 441 (red,
Liquid crystal panels 441R and 441 for green and blue color lights respectively
G, 441B) is an optical system for illuminating an image forming area of the light source device 413, a first lens array 418, a second lens array 414, a polarization conversion element 415, and a superimposing lens 416. Equipped with.

The light source device 413 includes a light source lamp 411 that emits a radial ray, an elliptical mirror 412 that reflects the emitted light emitted from the light source lamp 411, and an elliptical mirror 412 that is emitted from the light source lamp 411. And a collimating concave lens 413A that collimates the collimated light. A UV filter (not shown) is provided on the plane portion of the parallelizing concave lens 413A. Also, the light source lamp 4
As 11, a halogen lamp, a metal halide lamp, and a high-pressure mercury lamp are frequently used. Furthermore, the ellipsoidal mirror 4
A parabolic mirror may be used instead of 12 and the collimating concave lens 413A.

The first lens array 418 has a structure in which small lenses having a substantially rectangular contour when viewed in the optical axis direction are arranged in a matrix. Each small lens has a light source lamp 4
The light flux emitted from 11 is divided into a plurality of partial light fluxes.
The contour shape of each small lens is set to be substantially similar to the shape of the image forming area of the liquid crystal panel 441.
For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel 441 is 4: 3, the aspect ratio of each small lens is also set to 4: 3.

The second lens array 414 has substantially the same structure as the first lens array 418, and has a structure in which small lenses are arranged in a matrix. The second lens array 414 has a function of forming an image of each small lens of the first lens array 418 on the liquid crystal panel 441 together with the superimposing lens 416.

The polarization conversion element 415 is arranged between the second lens array 414 and the superimposing lens 416 and is unitized with the second lens array 414. The polarization conversion element 415 as described above converts the light from the second lens array 414 into one type of polarized light, and thus the light utilization efficiency in the electro-optical device 44 is improved. As shown by a chain double-dashed line 410 in FIG. 1, the unitized polarization conversion element 415 and the second lens array 414 and the first lens array 418 are integrally unitized.

More specifically, the polarization conversion element 415 sets 1
Each of the partial lights converted into the polarized light of the type has a superposition lens 41.
6 by the liquid crystal panel 44 of the electro-optical device 44
Substantially superimposed on 1R, 441G and 441B. In the projector 1 (electro-optical device 44) using the liquid crystal panel 441 that modulates polarized light, since only one type of polarized light can be used, almost all of the light from the light source lamp 411 that emits other types of randomly polarized light is used. Half are not used.
Therefore, by using the polarization conversion element 415, all the light emitted from the light source lamp 411 is converted into one type of polarized light, and the light utilization efficiency in the electro-optical device 44 is improved.
Such a polarization conversion element 415 is introduced in, for example, Japanese Patent Laid-Open No. 8-304739.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and reflection mirrors 423 and 424.
And has a function of separating a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422 into three color lights of red, green and blue.

The relay optical system 43 includes an incident side lens 43.
1, relay lens 433, and reflection mirrors 432, 4
34, and has a function of guiding the color light (red light) separated by the color separation optical system 42 to the liquid crystal panel 441R.

In such an optical system 4, the dichroic mirror 421 of the color separation optical system 42 transmits the blue light component of the luminous flux emitted from the integrator illumination optical system 41, and also separates the red light component and the green light component. reflect. The blue light component transmitted by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 417, and reaches the blue liquid crystal panel 441B. The field lens 417 converts each partial light flux emitted from the second lens array 414 into a light flux parallel to the central axis (chief ray) thereof. Other liquid crystal panel 4
The same applies to the field lens 417 provided on the light incident side of 41R and 441G.

Of the red light and the green light reflected by the dichroic mirror 421, the green light is reflected by the dichroic mirror 422 and passes through the field lens 417 to reach the liquid crystal panel 441G for green. On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical system 43, further passes through the field lens 417, and reaches the liquid crystal panel 441R for red light. The relay optical system 43 is used for red light because the optical path length of the red light is longer than the optical path lengths of the other color lights, so that the reduction of the light use efficiency due to the diffusion of the light or the like is prevented. This is because. That is, the partial light flux that has entered the incident side lens 431 is directly transmitted to the field lens 417.

The electro-optical device 44 is provided with three liquid crystal panels 441R, 441G and 441B as light modulators, and uses, for example, a polysilicon TFT as a switching element and is separated by the color separation optical system 42. Each of the colored lights is generated by these three liquid crystal panels 441R and 441.
G, 441B modulates according to image information to form an optical image.

The cross dichroic prism 45 has three
The image modulated for each color light emitted from the liquid crystal panels 441R, 441G, and 441B is combined to form a color image. In the cross dichroic prism 45, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interfaces of the four rectangular prisms. Three color lights are combined by the dielectric multilayer film. Then, the color image combined by the cross dichroic prism 45 is
It is emitted from the projection lens 46 and enlarged and projected on the screen.

[2. Configuration of Light Guide] Next, the configuration of the light guide 100 as the optical component casing according to the present invention will be described. FIG. 2 is an enlarged perspective view showing a main part of the light guide 100, that is, a part indicated by reference numeral A in FIG. FIG. 3 is a perspective view showing a mirror holding member 60 which is a part of the mirror holding unit 3 in which the dichroic mirror 421 is housed. FIG. 4 is a front view showing the mirror holding member 60. FIG. 5 is a vertical sectional view showing the mirror holding member 60.

As shown in FIG. 1, the light guide 100 accommodates the above-mentioned optical systems 41 to 45, and each of these optical systems 41 to 45 is a dashed line Z which is an illumination optical axis defined in a plane. It is a resin housing to be placed on top of. The light guide 100 includes a light guide main body 2 that is a housing main body, and a mirror holding unit 3 installed in the light guide main body 2.

The light guide body 2, which is partially shown in FIG. 2, has optical components 416, 417, 422-424, 4 respectively.
The lower light guide 21 is provided with a groove portion into which 31 to 434 (FIG. 1) is slidably fitted from above, and a lid-shaped upper light guide 22 that closes an upper opening of the lower light guide 21. . The light guide body 2
Is provided with a structure for attaching the mirror holding unit 3, and the details of such a structure will be described later.

Next, the structure of the mirror holding unit 3 and the mounting structure of the light guide body 2 and the mirror holding unit 3 will be described. Here, the dichroic mirror 421 to be adjusted is formed in a substantially rectangular plate shape having a thickness dimension T, as shown in FIGS. Further, as shown in FIG. 5, in this dichroic mirror 421, the surface on which the light flux reflected by the reflection mirror 424 (FIG. 1) is incident is an incident surface 421A, and the surface through which this incident light flux is transmitted and is emitted. This is the surface 421B.

As shown in FIG. 3, for the sake of convenience, the incident surface 421A and the exit surface 421 of the dichroic mirror 421 are shown.
The direction in which B and B face each other is referred to as P direction. Further, an axis passing through the center of the incident surface 421A of the dichroic mirror 421 and extending in the vertical direction in the figure is defined as a Q axis. Further, an axis extending on the incident surface 421A of the dichroic mirror 421 and extending in the left-right direction in the drawing and intersecting the axis Q perpendicularly is defined as an R axis.

As shown in FIGS. 2 to 5, the mirror holding unit 3 is a member for adjusting the direction of the incident surface 421A of the dichroic mirror 421 with respect to the incident light beam in the light guide body 2, and the dichroic mirror 42.
1 and the mirror holding member 60.
And two elevation angle adjusting screws 70 as the first adjusting member,
A left-right rotation adjusting screw 80 as a second adjusting member, a plate 90, and two fixing screws 110 are provided.

As shown in FIGS. 4 and 5, the biasing member 50 has the incident surface 4 on the upper side of the dichroic mirror 421.
It is a member made of metal or resin that is mounted on the dichroic mirror 421 by sandwiching it from both sides of 21A and the emission surface 421B. The biasing member 50 has a concave shape in a front view, and two contact portions 51, 52 having a rectangular shape in a front view are formed at predetermined intervals at portions of the concave shape that project upward at both ends. Has been done. The biasing member 50 is attached to a predetermined position of the dichroic mirror 421 so that the tip end portions of the elevation angle adjusting screws 70 (FIG. 2) come into contact with these two contact portions 51 and 52, respectively.

As shown in FIGS. 3 and 4, the mirror holding member 60 allows the dichroic mirror 421 to rotate about the Q axis and the R axis, and the mirror holding frame 6
1, a first leaf spring 67 as a first biasing member provided on the mirror holding frame 61, a second leaf spring 68 as a second biasing member similarly provided on the mirror holding frame 61, and Two third leaf springs 6 provided on the mirror holding frame 61
9 and.

As shown in FIGS. 3 and 4, the mirror holding frame 61 is a substantially rectangular parallelepiped metal or resin frame-shaped member for accommodating the dichroic mirror 421.
A shaft portion 63 formed on the upper and lower sides of the central portion of the frame main body 62 in the figure, and a protruding portion 64 protruding from the frame main body 62.
And a fixing portion 65 as a fixing member for stopping rotation of the mirror holding frame 61 itself with the Q axis as a rotation axis.

As shown in FIG. 3, in the frame body 62,
Ejection surface 421 of dichroic mirror 421 to be stored
On the exit side plate 621 on the B side, a rectangular opening 6 having a size substantially the same as or slightly smaller than the exit surface 421B is provided at a position corresponding to the exit surface 421B of the dichroic mirror 421.
21A is formed. Further, this ejection side plate 621
In the above, a rectangular opening 621B extending along the R-axis direction is formed above the opening 621A. Further, in the central portion of the ejection side plate 621, the opening 621 is formed.
On the upper and lower sides with B sandwiched, a bent portion 6 bent to the light exit side
21C are formed respectively.

On the other hand, although not clearly shown in FIG. 3, in the frame body 62, the dichroic mirror 4 to be housed is stored.
The entrance side plate 622, which is on the entrance surface 421A side of the reference numeral 21, is provided at a position corresponding to the entrance surface 421A of the dichroic mirror 421 at an opening 622A similar to the opening 621A.
Are formed.

Further, as shown in FIG. 3, in the frame main body 62, the upper plate 623, which is the upper side surface of the frame main body 62, is provided with the urging member 50 mounted on the dichroic mirror 421.
An opening 623A is formed to expose the upper side of 2. The opening 623A has a size such that it can be moved only slightly in the P direction. The frame body 62
When attaching the dichroic mirror 421 to
The dichroic mirror 421 is inclined and inserted from the opening 621A or the opening 622A of the frame body 62. This has the advantage that the thickness dimension of the frame body 62 in the P direction can be reduced.

Further, as shown in FIGS. 4 and 5, on the inner surface of the exit side plate 621, two projections 66 projecting toward the light beam entrance side are formed at predetermined intervals at the lower end portion thereof.
The incident side plate 622 side of these protrusions 66 has a spherical shape.

When the dichroic mirror 421 is housed in the frame body 62, the spherical surface portion 662, which is the spherical portion of the projection 66, and the exit surface 421B of the dichroic mirror 421 are in contact at each projection 66 at one point. It will be in the state of doing. That is, the lower surface of the exit surface 421B of the dichroic mirror 421 is supported at two points.

As shown in FIG. 4, the shaft portion 63 is a portion that allows the frame body 62 to rotate in the direction of arrow B about the Q axis as the center of rotation. The shaft portion 63 includes an upper shaft portion 631 formed on the upper side of the frame body 62, and a lower shaft portion 632 coaxially with the upper shaft portion 631 and below the frame body 62.
With. As shown in FIG. 3, the upper shaft portion 631 includes a tongue-shaped extending plate 631A extending from the bent portion 621C of the frame body 62 to the incident side plate 622 side, and a cylinder formed on the upper surface of the extending plate 631A. Cylindrical portion 631B and this cylindrical portion 63
1B and a shaft 631C formed in the central portion of the upper surface. The lower shaft portion 632, as shown in FIG.
In the main body bottom plate 624, which is the bottom surface part of the circular plate 632, the circular plate 632 having the same diameter is formed at a position coaxial with the above-mentioned cylindrical portion 631B.
A and the central portion of the lower surface of the disc 632A,
The shaft 631C and the coaxial shaft 632B are provided.

The projecting portion 64 is provided with a left / right rotation adjusting screw 80.
As shown in FIG. 3, it is a substantially rectangular shape which is formed so as to project upward and leftward from the upper left end portion of the incident side plate 622 of the frame body 62 as shown in FIG. It is a plate material.

As shown in FIG. 3, the fixing portion 65 has a fixing screw 110 (FIG. 2) screwed from the outside to fix the rotation of the frame body 62 around the Q axis in the direction of arrow B. One portion is formed on each of the left and right ends of the ejection side plate 621. Each fixing portion 65 includes, on the emission side plate 621, an extension portion 651 extending from the upper portion of the opening 621B to the light beam emission side, and a cylindrical tube portion 652 formed on the upper surface of the extension portion 651. Prepare This tube portion 652
A cylindrical screw hole 652A is formed in the central portion of the.

As shown in FIG. 3, the first leaf spring 67 is a leaf spring between the frame body 62 and the biased member 50,
A base 671 attached to the frame body 62 and the base 6
71 and two arm portions 672 extending in opposite directions from each other. The base 671 has a U-shaped cross section and a rectangular shape in plan view. This rectangular portion has a plurality of holes 671A.
Are formed at predetermined positions. The base 671 is the frame body 6
It is arranged so as to straddle the upper and lower bent portions 621C, and is screwed to the upper and lower bent portions 621C through a plurality of holes 671A.

The two arm portions 672 are spring portions between the frame main body 62 and the abutting portions 51 and 52 of the biasing member 50, and as shown in FIG. It is formed to be slightly smaller than the opening size O of the opening 621B formed in the emission side plate 621 of the main body 62. Therefore, the two arm portions 672 can be inserted into the opening 621B.
These two arm portions 672 are inserted into the opening 621B, and the two abutting portions 51, 52 of the biased member 50.
Is urged.

From the above, when the dichroic mirror 421 is housed in the frame body 62, the dichroic mirror 4
The lower end portion of 21 is abutted against the spherical surface portion 662 of the protrusion 66, so that the lower end portion 21 is supported by a slight movement within the frame body 62. On the other hand, the upper part of the dichroic mirror 421 is
The first leaf spring 67 causes the biased member 50 to move the incident surface 421.
Since it is biased toward the A side, it moves along the arrow C in FIG. 5 by the opening dimension of the opening 623A of the frame body 62. Therefore, when only the dichroic mirror 421 is inserted into the frame main body 62, the dichroic mirror 421 housed in the frame main body 62 is inclined inside the frame main body 62 toward the incident surface 421A.

As shown in FIGS. 2, 3 and 5, the second leaf spring 68 is a spring member that functions as an elastic body between the frame body 62 and a part of the lower light guide 21, and is attached to the frame body 62. The base 681 is provided with two arms 682 extending from the base 681 in opposite directions. As shown in FIG. 3, the base 681 has a U-shaped cross section. The dimension of the U-shaped opening is approximately the same as or slightly larger than the thickness of the frame body 62. Base 681
Is inserted from the opening portion and is screwed to the left end portion of the frame body 62 from the light beam emission side.

The two arms 682 function as elastic members between the frame body 62 and a part of the lower light guide 21. The two arms 682 are, as shown in FIG. 5, one of the facing surfaces 68 of the base 681.
It is a portion extending from 1A in two outer directions. A bent portion 682A, which is bent toward the other surface 681B of the facing surface of the base 681, is formed at the tip of each arm 682. These two bent portions 682A are parallel to each other. Here, as shown in FIG. 2, when the frame body 62 is housed in the lower light guide 21 with the second leaf spring 68 attached to the frame body 62, these two bent portions are The 682A abuts on a wall surface 21X, which will be described later, which is a part of the lower light guide 21, in a state substantially parallel to the wall surface 21X.

As shown in FIG. 5, the third leaf spring 69 is an elastic member having a substantially U-shaped cross section. In the third leaf spring 69, one of the facing surfaces 69A has a central portion bent toward the facing surface. This third leaf spring 69 is
The other surface (surface on the body emission surface side) of the opposing surfaces that are inserted into the lower end portion of the frame main body 62 from the U-shaped opening portion.
At 69B, it is screwed to the ejection side plate 621 of the frame body 62. At this time, the tip 6 of the bent portion of the one surface 69A
9A1 is the spherical surface portion 6 of the protrusion 66 formed on the frame body 62.
The position is approximately the same height as the tip of 62. Bend point 6
A gap is provided between 9A1 and the tip of the spherical surface portion 662 of the protrusion 66. This gap is formed to have a size that is substantially the same as or slightly smaller than the thickness of the dichroic mirror 421. In this gap, the dichroic mirror 421
The lower part of is inserted.

Here, as shown in FIG. 2, on the inner surface of the bottom plate of the lower light guide 21, a frame body 62 of the mirror holding frame 61 is provided.
A bearing 21A that supports the lower shaft portion 632 on the lower side is formed. The lower light guide 21 has a frame body 6
A wall surface 21 </ b> X that abuts the second leaf spring 63 when the second plate 2 is attached is formed.

As shown in FIG. 2, the upper light guide 22
Includes a first upper plate 221 and a second upper plate 222 formed on the light flux incident surface side of the first upper plate 221 so as to be lowered from the first upper plate 221 by one step. The first upper plate 221 has a bearing 22 that supports the upper shaft portion 631 of the frame body 62 on the upper side.
1A is formed. This bearing 221A has a shaft portion 6
It is a through hole into which the shaft 631C of 31 is fitted. Also,
Two openings 221B are formed in the first upper plate 221. Each opening 221B has an elongated shape extending in the direction of arrow B shown in FIG. Three rectangular notches 221C are formed in the first upper plate 221.

Further, in the side plate connecting the first upper plate 221 and the second upper plate 222, the three notches 2 of the first upper plate 221 are formed.
A similar notch is formed at a position corresponding to 21C. As a result, three recesses are formed in the upper light guide 22. The upper light guide 22 is opened in these three recessed portions, and the inside and outside thereof communicate with each other. The communicating recesses allow the rotational positions of the dichroic mirror 421 and the mirror holding frame 61 to be adjusted from the outside.

When the upper light guide 22 is installed on the lower light guide 21 to which the frame main body 62 including the dichroic mirror 421 is installed, these three recessed portions are biased by the bias applied to the dichroic mirror 421. The upper light guide 22 corresponds to the contact portions 51 and 52 of the member 50 and the projecting portion 64 of the frame body 62.
Are formed at predetermined positions.

The two elevation angle adjusting screws 70 are screw members for adjusting the elevation angle of the dichroic mirror 421, that is, the direction of the incident surface 421A in the direction of arrow C in FIG. More specifically, as shown in FIGS. 2 and 5, the two elevation angle adjusting screws 70 are inserted into the two recessed portions of the upper light guide 22 from the outside to the inside, and are attached to the dichroic mirror 421. Abutting portion 5 of biasing member 50
1, 52 are pressed to the ejection side plate 621 side of the frame body 62,
As a result, the incident surface 42 of the dichroic mirror 421 is
The direction of 1A is adjusted in the direction of arrow C.

The left / right rotation adjusting screw 80 is used for the mirror holding frame 6
1 right and left rotation, that is, by adjusting the direction of the side plates 621 and 622 of the frame body 62 in the direction of arrow B shown in FIG.
Finally, the incident surface 42 of the dichroic mirror 421
A screw member for adjusting the direction of 1A in the direction of arrow B.
The left / right rotation adjusting screw 80 is inserted from the outer side to the inner side in the leftmost concave portion of the upper light guide 22, and presses the projecting portion 64 of the mirror holding frame 61 in the P direction.

As shown in FIG. 2, the plate 90 is a member that is fixed to the second upper plate 222 of the upper light guide 22 and supports the adjusting screws 70 and 80 at predetermined positions, and is a rectangular plate-shaped plate body. 91, and a tongue-shaped fixing portion 92 formed vertically from substantially the center of one long side of the plate body 91. When the plate main body 91 is attached to the upper light guide 22, screw holes 91A are formed at positions corresponding to the three recessed portions. These screw holes 91A are formed so that the adjusting screws 70 and 80 can be screwed together. Each adjusting screw 70, 80 is attached to the light guide main body 2 via a plate 90 by a screwing structure. In addition, the plate 90 is a plate body 91.
Is fixed to the side plate of the upper light guide 22, the fixing portion 92 is screwed and fixed to a fixing projection portion (not shown) of the second upper plate 222.

The two fixing screws 110 are screw members for fixing the movement of the mirror holding frame 61 in the light guide main body 2, and include a screw main body 111 and a plain washer 112.
Each of the fixing screws 110 has a first washer 221 of the upper light guide 22 with the screw body 111 inserted through the flat washer 112.
Is screwed into the screw hole 652A in the cylindrical portion 652 of the fixing portion 65 of the mirror holding frame 61 from the outer side of the first upper plate 221 through the opening portion 221B. As a result, the mirror holding frame 61 is fixed in the light guide body 2.

[3. Adjustment Method of Incident Surface Direction of Dichroic Mirror] Next, with respect to the incident light flux, the direction of the incident surface 421A of the dichroic mirror 421, that is, the adjustment method of the attitude of the dichroic mirror 421 will be described.
A description will be given based on the flowchart shown in FIG. <1> The biasing member 50 is attached to the dichroic mirror 421, and the dichroic mirror 421 in this state is housed in the mirror holding frame 61 (process S1). At this time, the projection surface 421B of the dichroic mirror 421 is attached to the two projections 6
6 is brought into contact with the tip of the spherical surface portion 662.

<2> The two third leaf springs 69 are screwed and fixed to the lower end portion of the frame body 62 (step S2). At this time, the tip end 69A1 of the bent portion of the third leaf spring 69 urges the lower end portion of the incident surface 421A of the dichroic mirror 421 toward the projection 66 side, and the lower end portion of the dichroic mirror 421 is substantially moved within the mirror holding frame 61. Make it fixed.

<3> The second leaf spring 68 is screwed and fixed to the left end portion of the frame body 62 so that the two arm portions 682 are on the ejection side plate 621 side (step S3). <4> The base portion 671 of the first leaf spring 67 is screwed and fixed to the bent portion 621C of the frame body 62, and the two arm portions 672 are brought into contact with the corresponding contact portions 51 and 52 (Process S
4).

By the above procedure, the lower part of the dichroic mirror 421 is substantially fixed in the frame body 62. The upper portion of the dichroic mirror 421 is in a state of being moved by the opening dimension of the opening 623A of the frame body 62.

<5> The mirror holding frame 61 is incorporated into the lower light guide 21 (process S5). Specifically, the lower shaft portion 632 of the mirror holding frame 61 is pivotally supported by the bearing 21A of the lower light guide 21. At this time, the bent portions 682A of the two arm portions 682 of the second leaf spring 68 are arranged so as to contact the wall surface 21X of the lower light guide 21.

<6> In the plate 90, the three screw holes 91A of the plate body 91 are provided with the two elevation angle adjusting screws 70.
Then, the left and right rotation adjusting screws 80 are screwed to some extent, and are temporarily assembled (step S6). <7> The plate 90 in which the adjusting screws 70 and 80 are thus temporarily assembled is screwed and fixed to the upper light guide 22 (step S7). Specifically, with the plate body 91 along the side plate of the upper light guide 22, the upper light guide 22
The fixing portion 92 is screwed and fixed to a fixing protrusion (not shown) of the second upper plate 222.

<8> The upper light guide 22 as described above is installed at a correct position on the lower light guide 21 (process S).
8). Specifically, first, the upper light guide 22 is brought closer to the lower light guide 21. At this time, the shaft 631C of the upper shaft portion 631 of the mirror holding frame 61 is fitted into the bearing 221A, which is a through hole formed in the upper plate 473 of the upper light guide 22, to support the shaft. Since the bearing 221A is a through hole, whether or not the shaft 631C and the bearing 221A are fitted can be confirmed from the outside of the light guide body 2. Then, the left / right rotation adjusting screw 80 biases the projecting portion 64 toward the ejection side plate 621, and the two elevation angle adjusting screws 70 cause the contact portions 51,
52 is biased toward the ejection side plate 621. In this way, the upper light guide 22 is installed on the lower light guide 21.

<9> Here, the two fixing screws 110 are screwed into the screw holes 652A of the cylindrical portion 652 to some extent and temporarily assembled (process S9).

<10> When the left / right rotation adjusting screw 80 is rotated by using a tool such as a screwdriver, the left / right rotation adjusting screw 8
0 and the protruding portion 64, the frame main body 62
Since the two arm portions 682 of the second leaf spring 68 expand and contract between the lower light guide 21 and the wall surface 21X of the lower light guide 21, the mirror holding frame 61 rotates in the rotation direction about the Q axis (arrow B in FIG. 4). Direction). At this time, as the mirror holding frame 61 rotates, the dichroic mirror 421 also follows and rotates. Therefore, by rotating the left / right rotation adjusting screw 80 and stopping the rotation operation at a predetermined position, the mirror holding frame 6
1, that is, the attitude of the dichroic mirror 421 is adjusted (process S10). As described above, the direction of the incident surface 421A of the dichroic mirror 421 in the rotation direction around the Q axis is adjusted.

<11> Mirror holding frame 6 adjusted in this way
In order to prevent 1 from moving, it is securely screwed and fixed with the two fixing screws 110 (step S11). Specifically, plain washer 1
The fixing screw body 111 through which the 12 is inserted is attached to the upper light guide 2
For the two openings 221B of the second first upper plate 221,
They are inserted from the outer side to the inner side and screwed into the screw holes 652A in the cylindrical portion 652 of the fixing portion 65 of the mirror holding frame 61, respectively. As described above, since the temporary assembly and the main assembly are divided into two and fixed by the fixing screw 110, it is possible to suppress the distortion due to the screw fixing.

<12> When the two elevation angle adjusting screws 70 are respectively rotated by using a tool such as a screwdriver, the mirror holding frame 61 and the mirror holding frame 61 are moved according to the contact state between the elevation angle adjusting screws 70 and the biased member 50. Between the biased member 50, the first leaf spring 6
Since the two arm portions 672 of No. 7 expand and contract, the dichroic mirror 421 rotates within the frame body 62 about the R axis. Therefore, the elevation angle of the dichroic mirror 421 is adjusted by rotating each elevation angle adjusting screw 70 and stopping the rotation operation at a predetermined position (process S12). That is, the incident surface 42 of the dichroic mirror 421 in the rotation direction about the R axis (the direction of arrow C in FIG. 5).
Adjust the direction of 1A. The attitude of the dichroic mirror 421 is adjusted by the above procedure.

[4. Effects] According to this embodiment, the following effects are obtained. (1) The direction of the incident surface 421A of the dichroic mirror 421 can be adjusted independently from the outside of the light guide body 2 with the Q axis and the R axis orthogonal to each other as rotation centers.

(2) Since the adjusting screws 70 and 80 do not directly press the entrance surface 421A or the exit surface 421B of the dichroic mirror 421 in the adjustment in either direction, the entrance surface 421A of the dichroic mirror 421 is directly biased. Compared with the case, it is possible to effectively prevent the dichroic mirror 421 from being damaged or distorted.

(3) After adjusting the direction of the incident surface 421A of the dichroic mirror 421, the screw hole 6 of the fixing portion 65 is
Since the rotation of the mirror holding frame 61, that is, the dichroic mirror 421 is stopped by screwing 52A and the fixing screw 110, the dichroic mirror 4 after adjustment is adjusted.
The posture of 21 can be reliably maintained.

(4) Since the adjusted mirror holding frame 61 is fixed by screwing the fixing screw 110 into the screw hole 652A of the fixing portion 65, for example, compared with the case where the mirror holding frame 61 is fixed by adhesion using an adhesive or the like. Then, the direction of the mirror holding frame 61, that is, the incident surface 421A of the dichroic mirror 421 can be easily readjusted by a simple operation of rotating the fixing screw 110.

(5) First upper plate 221 of upper light guide 22
Since the opening 221B extending along the rotation direction of the mirror holding frame 61 is formed on the above, even if the mirror holding frame 61 rotates in the direction of the arrow B, the fixed portion 65 is always provided below the opening 221B. Since the screw hole 652A of the cylindrical portion 652 is located, the fixing of the mirror holding frame 61 with the fixing screw 110 can be easily performed.

(6) Since the Q axis and the R axis, which are rotation centers, are set on the incident surface 421A of the dichroic mirror 421, the incident surface 421A of the dichroic mirror 421 can always be placed at the designed optical path position.

(7) Since the screw members of the elevation angle adjusting screw 70 and the left / right rotation adjusting screw 80 are used to adjust the direction of the dichroic mirror 421, a simple adjustment can be made simply by rotating the screws. Can be implemented.

(8) Since the posture of the dichroic mirror 421 is adjusted by the adjusting screws 70 and 80 which are screw members, the amount of advance and retreat of each adjusting screw 70 and 80 can be finely adjusted, and the dichroic mirror 421 can be adjusted. Incident surface 4
The direction of 21A can be adjusted accurately.

(9) Install the first leaf spring 67 from the base portion 671 to 2
Since one arm portion 672 is a single member that extends, the number of members can be reduced and the cost can be suppressed as compared with the case where two elastic members such as leaf springs corresponding to the contact portions 51 and 52 are provided. it can.

(10) Since the second leaf spring 68 is configured to transmit the reaction force to the light guide body 2, the spatial positions of the light guide body 2, the second leaf spring 68, and the mirror holding frame 61 relative to each other. Can always be fixed in a fixed position.

(11) Since the second leaf spring 68 is attached to the side of the frame body 62, the second leaf spring 68 has a dichroic mirror compared to the case where the second leaf spring 68 is attached to the wall surface 21X of the lower light guide 21. Since it is not necessary to carefully attach the second leaf spring 68 to the wall surface 21X or the like of the lower light guide 21 so as not to contact the 421, the second leaf spring 6
8 can be installed easily and properly.

(12) Attach the projection 66 having a spherical tip to the frame main body 62.
Since two are formed on the
Of the dichroic mirror 421 and the incident surface 42 of the dichroic mirror 421
1A and 2A contact at two points. Therefore, the dichroic mirror 421 can rotate in the direction of arrow C.

(13) Since the leaf springs 67 to 69 are arranged so as not to be in the central portion of the exit surface 421B of the dichroic mirror 421, they are also suitable for the dichroic mirror 421 that transmits a part of the incident light. The target of adjustment can be expanded.

(14) The first leaf spring 67 is attached to the frame body 62 after the dichroic mirror 421 is housed in the frame body 62.
It is possible to prevent an obstacle when inserting and arranging 1 in the frame body 62.

[5. Modification] The present invention is not limited to the above-described embodiment, and includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention. For example, in the above-described embodiment, the adjustment target is the dichroic mirror 421, but the present invention is not limited to this, and another dichroic mirror 422 may be used. Further, it may be an ordinary reflection mirror. In short, the type of mirror to be adjusted is not limited to the dichroic mirror.

In the above embodiment, the two elevation angle adjusting screws 7 are used.
0, the biasing member 5 of the dichroic mirror 421
Although 0 is pressed at two points, the present invention is not limited to this. For example, one elevation angle adjusting screw 70 presses the biased member 50 of the dichroic mirror 421 to adjust the direction of the incident surface 421A. You may comprise. In this case,
For example, it is possible to adopt a configuration in which the central portion of the upper end of the dichroic mirror 421 is biased. The number of elevation angle adjusting screws 70 is not limited to one or two, and may be any number. Further, the left / right rotation adjusting screw 80 is attached to the frame body 62.
Although the upper left side is pressed, the pressing part is not particularly limited and is not particularly limited as long as the Q axis can be the center of rotation. At this time, the number of right / left rotation adjusting screws 80 may be plural.

In the above-described embodiment, the dichroic mirror 4 is arranged with the R axis in the lower portion of the frame body 62 as the center of rotation.
Although the elevation angle of 21 is adjusted, the present invention is not limited to this. For example, the protrusion 66 is provided at the center of the frame body 62 in the height direction.
May be formed so that the center of rotation in adjusting the elevation angle passes through the center of the illumination optical axis of the incident light. That is, the height position of the rotation center in the elevation angle adjustment is not particularly limited. Further, although the two protrusions 66 are formed on the lower portion of the frame body 62, the number of the protrusions 66 is not limited.

Further, in the above-described embodiment, the plate 90 is prepared as a separate body, and the plate 90 is installed on the side plate of the upper light guide 22, but the present invention is not limited to this.
For example, the plate 90 may be integrated with the upper light guide 22. Further, the plate 90 is integrally formed on the lower light guide 21, and when the upper light guide 22 is installed on the lower light guide 21, the portion corresponding to the plate 90 is located at a predetermined position. You may.

In the above embodiment, the plate 9
Nothing is provided between 0 and the upper light guide 22, but the plate 90 may be distorted depending on the positions of the adjusting screws 70 and 80, so that the distorting or the like does not occur. As described above, a reinforcing member may be interposed between the plate 90 and the side plate of the upper light guide 22. Further, this reinforcing member may be formed integrally with the lower light guide 21.

Although leaf springs are used as the first and second urging members, the present invention is not limited to this, and other urging members including, for example, coil springs, rubber, resin, sponge and the like can be used.
Further, although the screw structure is adopted as the first and second adjusting members, the structure is not limited to this, and the structure may be such that it is biased by pressure of air or the like or electromagnetic action.

In the above embodiment, the dichroic mirror 421 is the adjustment target, but the present invention is not limited to this, and other mirrors such as a reflection mirror can be the adjustment target. Further, although the mirror direction adjusting mechanism of the present invention is adopted in the projector 1, the present invention is not limited to this and can be adopted in other optical devices and electronic devices having a mirror. In addition, the specific structure, shape, and the like at the time of carrying out the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0098]

As described above, according to the present invention,
The effect that the distortion of the mirror is suppressed and the direction of the incident surface of the mirror can be adjusted independently in the biaxial rotation direction.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an optical unit of a projector according to an embodiment of the invention.

FIG. 2 is a perspective view showing a part of FIG. 1 in an enlarged manner.

FIG. 3 is a perspective view showing a mirror holding member including a dichroic mirror.

FIG. 4 is a front view showing the mirror holding member.

FIG. 5 is a vertical sectional view showing the mirror holding member.

FIG. 6 is a flowchart showing a procedure for adjusting the attitude of the dichroic mirror.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projector 2 Light guide main body 4 as a case main body 4 Optical unit 21 Lower light guide 22 Upper light guide 41 Integrator illumination optical system 42 which is an optical component Color separation optical system 43 which is an optical component Relay optical system 44 which is an optical component Electro-optical device 45 which is a component 45 Cross dichroic prisms 51 and 52 which are optical components Abutting portion 60 Mirror holding member 61 Mirror holding frame 67 First leaf spring 68 as a first urging member Second as a second urging member Leaf spring 70 Elevation angle adjusting screw as a first adjusting member 80 Left and right rotation adjusting screw as a second adjusting member 92 Fixing portion 110 as a fixing member Fixing screw 100 Light guide 421 as a housing for optical components Dichroic mirror 421A as a mirror Incident surface 441 (441R, 441G, 441B) Liquid crystal panel Rotation axis Z planarly defined dashed line indicating a predetermined illumination optical axis rotation axis R mirror Q frame main body is rotated

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/74 G02B 7/18 BF term (reference) 2H043 AA03 AA23 AB05 AB07 AB09 AB18 AB35 AD21 AE16 BC02 2H088 EA14 EA15 EA19 HA13 HA24 HA28 MA20 5C058 AA06 AB06 BA23 BA35 EA02 EA11 EA26

Claims (10)

[Claims] 1. A plurality of optical components including a mirror are accommodated,
A housing for optical components, in which a plurality of these optical components are arranged on a predetermined illumination optical axis defined in a plane, a mirror holding member for holding the mirror, and a housing for storing other optical components. A mirror body, the mirror holding member holds the mirror rotatably so that an angle formed by a plane including the illumination optical axis and an incident surface of the mirror can be changed, and the mirror holding frame. And a first urging member for urging the mirror in the rotational direction with respect to the mirror holding frame, and a normal line of a plane including the illumination optical axis with respect to the optical component casing as an axis. A second urging member for urging the mirror holding frame in a rotation direction, wherein the housing body is pressed against the mirror from a side opposite to the urging direction of the first urging member. A first adjusting member for adjusting the rotational position of the Optical component casing, characterized in that the second adjusting member is provided for adjusting the rotational position of the mirror support frame and presses said mirror support frame from the side opposite to the biasing direction of the energizing member. 2. The optical component casing according to claim 1, wherein the first adjusting member and the second adjusting member are attached to the casing main body by a screw structure. Case. 3. The optical component casing according to claim 1, wherein the mirror is attached to the mirror so as to correspond to a biasing position of the first biasing member, and the first biasing member is provided. An optical component casing, comprising an abutting portion that abuts. 4. The optical component casing according to claim 1, wherein a rotation shaft about which the mirror rotates with respect to the mirror holding frame is a plane including an incident surface of the mirror. A housing for optical parts, which is set inside. 5. The optical component casing according to claim 1, wherein the rotation axis of the mirror holding frame is set within a plane including the incident surface of the mirror. Characteristic optical component housing. 6. The optical component casing according to claim 1, wherein the second biasing member is configured to transmit a reaction force to the casing body. A housing for optical parts. 7. The optical component casing according to claim 1, further comprising a fixing member for screwing and fixing the mirror holding frame to the casing main body. Case for. 8. An optical unit comprising the optical component casing according to any one of claims 1 to 7 and the mirror. 9. The optical unit according to claim 8, wherein the mirror is a dichroic mirror that transmits a part of incident light. 10. The optical component casing according to any one of claims 1 to 7, or claim 8 or claim 9.
A projector comprising the optical unit according to the above 1.