JPH10133279A - Liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the directions of θ angle, X axis and Y axis with simple constitution without increasing the number of parts. SOLUTION: A fixed plate 29 is provided with adjusting screws 33L, R rotatable around the Y axis on the upper part, and dowels 31L, R on the surface. A Y axis support plate 40 is provided with abutment parts 44L, R abutted on with the adjusting screws 33L, R and dowels 43L, R on the upper part left/ right, and the abutment part 44R is provided with the adjusting screw 45 rotatable around the Y axis, and vertically long dowel holes 42L, R fitted to with the dowels 31L, R are provided on the surface. An X axis support plate 53 is provided with an abutment part 57 abutted on with the adjusting screw 45 and having a surface of 45 deg. on the upper part right side, and is provided with the long sideways dowel holes 56L, R fitted to with the dowels 43L, R, and the constitution fixing a liquid crystal panel 10 on the surface. They are laminatedly supported to the fixed plate 29 in order of the Y axis support plate 40, the X axis support plate 53. The adjusting screws 33L, R adjust in the directions of the Y axis and θ, and the adjusting screw 45 adjusts in the direction of the X axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal projector for projecting an optical image on a screen using a liquid crystal panel.

[0002]

2. Description of the Related Art As means for displaying a large image, conventionally,
An optical image of each color formed according to each video signal is illuminated with illumination light using one liquid crystal panel, and synthesized by a dichroic prism, and the synthesized optical image is transmitted through a projection lens (projection lens). 2. Description of the Related Art A liquid crystal projector that performs enlarged projection on a screen is known.

[0003] The optical images of each color formed by each of the three liquid crystal panels must be accurately superimposed and then incident on a dichroic prism.

Japanese Unexamined Patent Publication No. Hei 8-95013 discloses a support adjustment mechanism that enables adjustment of a mounting position of a liquid crystal panel. This conventional support adjustment mechanism incorporates a Z-axis stage 50, a Y-axis stage 40, a θ-axis stage 20, and an X-axis stage 10 on a base stage 60 in this order, and attaches a Z-axis adjustment screw to the base stage 60. , The Y-axis adjustment screw can be screwed into the Y-axis stage 40 and the X-axis adjustment screw can be screwed into the θ-axis stage 20 from the same direction (that is, adjustable). Accordingly, adjustment in each of the axial direction and the θ direction is enabled.

[0005]

However, the above-described conventional liquid crystal panel support and adjustment mechanism enables adjustment from the same direction, and the engaging portion of the adjustment member slides in the slide groove in accordance with the amount of tightening. Thus, since a so-called link mechanism is used to impart movement and rotation to each stage, a complicated structure is unavoidable.

The present invention has been made in view of the above circumstances, and provides a liquid crystal projector capable of adjusting the θ angle, the X axis, and the Y axis directions with a simple configuration without increasing the number of parts. The purpose is to provide.

[0007]

In order to solve the above-mentioned problems, the present invention irradiates an optical image of each color from a liquid crystal panel formed according to each video signal with illumination light, and combines the images with a dichroic prism. After that, in a liquid crystal projector that projects onto a screen, at least one of the liquid crystal panels is supported by a support adjustment mechanism, and the support adjustment mechanism has a hole through which an optical image passes. First and second adjustment members are movably attached in the Y-axis direction to an end of the first plate-shaped member on one side in the Y-axis direction. A fixed portion and a window hole through which an optical image passes are formed, a regulating portion is formed in the X-axis direction, and first and second abutments which are pressed by the first and second adjusting members are provided. In the second plate-shaped member in which the portion is formed Therefore, a third adjusting member is attached to the same side as the first and second adjusting members so as to be movable substantially in the direction of the Y axis, and the first and second abutting portions are connected to the third adjusting member. A first support portion that moves in accordance with the received pressure and a window through which the optical image passes are pierced to form an engagement portion that engages with the restriction portion. A third plate-shaped member having a third abutting portion that is pressed by the adjusting member, wherein movement in the X-axis direction is restricted by the restricting portion and the engaging portion, A liquid crystal projector having a second support portion that moves in accordance with the pressure received by the contact portion.

In the liquid crystal projector having the above structure, when the third adjusting member is moved, the second support moves in the X-axis direction in accordance with the pressing by the third adjusting member.

[0009]

FIG. 1 is a perspective view of a part of a liquid crystal projector according to an embodiment of the present invention, which is composed of a liquid crystal panel, a support adjusting mechanism, a dichroic prism, and a projection lens. FIG. 2 is an overall configuration diagram of the liquid crystal projector according to the present embodiment.

In FIG. 2, a light source 1 is a metal halide lamp which emits white light of random polarization. The parabolic mirror 2 has a reflecting surface 2a whose section is axisymmetrically formed on a part of the surface including the pole of the rotating paraboloid, and has a focal point (light source 1).
Is set at this focal position. ) Is a mirror that reflects the light radiated from the opening 2b to the outside (downward in FIG. 2) of the opening 2b. The IR-UV cut filter 3 is disposed near the opening 2b, and removes light in a wavelength range that is unnecessary for light of the three primary colors from the direct light from the light source 1 and the reflected light from the reflecting surface 2a. It is a filter for. The first lens array 4 constituting the optical integrator includes a plurality of first lenses 4a two-dimensionally arranged.
A direct light from the light source 1 and a reflected light from the reflecting surface 2a of the parabolic mirror 2 from which light in a wavelength range that is unnecessary for the three primary colors is removed. The light beam is split into a plurality of light beams and emitted. The aperture shapes of the plurality of first lenses 4a are the same. Note that the first lens array 4 is positioned at a position closer to the parabolic mirror 2 so that the IR
-It is arranged near the output side of the UV cut filter 3.

The polarization beam splitter 5 is a separation section of a triangular prism-shaped polarization conversion optical system, and converts each of the plurality of light beams split by the first lens array 4 into a first linearly polarized light whose polarization direction is orthogonal to each other. The light is separated into a light flux 6 of the component and a light flux 7 of the second linearly polarized light component. A polarization separation surface 5a is formed on the rear surface, which is the inclined surface of the right-angle prism included in the polarization beam splitter 5, and the first linearly polarized light component of the light incident from the first lens array 4 is converted into a polarization separation surface. 5a
And is reflected at a right angle to the incident angle of 45 degrees, and is emitted as a light flux 6. The total reflection surface 5c is formed so as to face the polarization separation surface 5a with an interval of the thickness 5b, and is orthogonal to the first linearly polarized light component of the light incident from the first lens array 4. The second linearly polarized light component is
At c, the light is reflected at a right angle to the incident angle of 45 degrees and emitted as a light flux 7. The dimensions of the thickness 5b are determined by the pitch at which the light flux 6 and the light flux 7 are emitted ( ^21/2 times the thickness 5b) and the second lens 8
The pitch is set based on the pitch a.

The second lens array 8 constituting the optical integrator is arranged two-dimensionally in the vicinity where the plurality of light beams 6 and 7 separated by the light beam splitter 5 converge. Is a lens array having the same number of second lenses 8a as the number of luminous fluxes 7. That is, the second lens array 8 has twice as many lenses as the number of the plurality of first lenses 4a of the first lens array 4, and each two lenses vertically adjacent to each other in FIG. The second lens 8a corresponds to each one of the first lenses 4a. A part of the exit surface of the second lens array 8 from which the light beam 7 is emitted is provided for converting the second linearly polarized light of the light beam 7 into the same polarization direction as the first linearly polarized light of the light beam 6. A half-wave plate 9 is attached. The half-wave plate 9 is a conversion unit of the polarization conversion optical system, and forms a polarization conversion optical system together with the polarization beam splitter 5 described above.

The liquid crystal panel 10 is a transmissive liquid crystal panel, and forms an optical image of B of RGB. The liquid crystal panel 11 is a transmissive liquid crystal panel, and G of RGB
To form an optical image. The liquid crystal panel 12 is a transmissive liquid crystal panel, and forms an optical image of R of RGB.

A color separation optical system for illuminating each of the three liquid crystal panels 10 to 12 with light of the corresponding primary color and separating each of the three primary colors comprises two dichroic filters 1.
3 and 16. The dichroic filter 13 has a cutoff value of a wavelength of 510 nm, reflects a light beam in the B wavelength band, and transmits a light beam in the R and G wavelength bands. The total reflection mirror 14 is for directing the separated light beam in the B wavelength band to the liquid crystal panel 10 side. The field lens 15 reflects the B reflected by the total reflection mirror 14.
This is for irradiating the liquid crystal panel 10 with the luminous flux of the wavelength band of. The dichroic filter 16 has a wavelength of 580
It has a cut-off value of nm, reflects the G-wavelength band among the R- and G-wavelength light beams transmitted through the dichroic filter 13, and transmits the R-wavelength light beam. The field lens 17 is a dichroic filter 16
This is for irradiating the liquid crystal panel 11 with the luminous flux of the G wavelength band separated by. The lenses 18 and 19 and the total reflection mirrors 20 and 21 constitute a relay optical system for guiding the light flux in the R wavelength band transmitted through the dichroic filter 16 to the liquid crystal panel 12 while maintaining its illuminance. Is the R derived by the relay optics
This is for irradiating the liquid crystal panel 12 with the luminous flux in the wavelength band of.

The dichroic prism 23 is provided with the aforementioned R
This is a three-primary-color combining optical system for combining each of the GB optical images. The dichroic prism 23 has four joined right-angle prisms 23a forming a cube or a rectangular parallelepiped. The junction has a first dichroic mirror 23b that reflects the optical image of B at right angles to the incident angle of 45 degrees and transmits the optical images of R and G.
Is reflected at a right angle to the incident angle of 45 degrees, and G
And a second dichroic mirror portion 23c for transmitting the optical images B and B.

The projection lens 24 is a projection optical system for enlarging and projecting a color optical image synthesized by the dichroic prism 23 on a screen (not shown).

Next, a support mechanism for the liquid crystal panel 11 will be described with reference to FIG.

The fixing plate 25 supports the liquid crystal panel 11 and is attached to a predetermined position on the upper surface of the pedestal 63. The fixing plate 25 is connected to the display surface 1 of the liquid crystal
A rectangular window hole (hidden on the back surface of the liquid crystal panel 11) corresponding to 1a is formed in the center, and the liquid crystal panel 11 is attached to two places above and one place below the window hole. Screw holes (located at the liquid crystal panel mounting screws 26 and hidden behind the liquid crystal panel 11). At the left and right ends of the lower end of the fixing plate 25, a left mounting portion 27L and a right mounting portion 27 bent at right angles are provided.
R is formed. Left mounting part 27L and right mounting part 27
A screw hole (hidden by the screw 28) is formed near each center of the R, and the fixing plate 25 is screwed to the pedestal 63 by the screw 28.

A mechanism for adjusting the support of the liquid crystal panels 10 and 12 will be described. The liquid crystal panel 12 is attached to a support adjustment mechanism facing the support adjustment mechanism to which the liquid crystal panel 10 is attached, with the dichroic prism 23 interposed therebetween. The support adjustment mechanisms used for the liquid crystal panel 10 and the liquid crystal panel 12 have basically the same structure except for the point of symmetry.

Therefore, a support adjustment mechanism for the liquid crystal panel 10 will be described below.

FIG. 3 is an assembly configuration diagram of the liquid crystal panel 10 and its support adjustment mechanism, and FIG. 4 is an assembly perspective view thereof.

In FIG. 3, the fixing plate 29 has a square shape, and a square window hole 30 slightly larger than the display surface 10a of the liquid crystal panel 10 is formed in the center. Window hole 30
A left dowel 31L and a right dowel 31R having a columnar shape are formed at two places on the left and right sides of the upper part of the table. On both left and right sides of the upper end of the fixed plate 29, support pieces 32L and 32R bent in the Z-axis direction (the direction of luminous flux projection) are formed. At the center of the support pieces 32L and 32R, screw holes 34 corresponding to the adjustment screws 33L and 33R (see FIG. 4) are screwed.

On the left and right sides of the lower end of the fixing plate 29, mounting pieces 35L and 35R bent at right angles are formed. Further, at the center of the lower end, a support piece 36 is similarly bent and formed. Mounting piece 3
5L and 35R are screwed at the center thereof with screw holes 37 for screwing to the pedestal 63 by screws 28 (see FIG. 1). At the center of the support piece 36, the movement in the Z-axis direction is restricted with a central portion of a rod-shaped spring 38 (see FIG. 4) arranged parallel to the X-axis (parallel and horizontal to the liquid crystal panel). A pair of hooks 39 are formed.

The Y-axis support plate 40 has a square shape, and a square window hole 41 slightly larger than the display surface 10a of the liquid crystal panel 10 is formed in the center. A vertically long left dowel hole 42L and a right dowel hole 42R are formed in two places on the left and right sides above the window hole 41. Above the left dowel hole 42L and the right dowel hole 42R, a cylindrical left dowel 43 is provided, respectively.
L and a right dowel 43R are formed. Y-axis support plate 40
The contact pieces 44L and 44R that are bent at right angles are formed on the upper left and right portions of the upper end of the contact piece. Contact piece 44
On the right side of R, a screw hole 46 corresponding to the adjustment screw 45 (see FIG. 4) is screwed.

A support piece 47 and a locking piece 48D bent in the Z-axis direction are formed substantially at the center and below the left side of the Y-axis support plate 40. Y-axis support plate 4
0, a step is formed between the support piece 47 and the locking piece 48D. It is located close to. A bar-shaped spring 49 disposed parallel to the Y-axis (vertical direction) is provided on the surface of the support piece 47 on the window hole 41 side.
A support piece 50 for regulating movement in the Z-axis direction is formed with the center portion of the support piece 50 interposed therebetween (see FIG. 4). Locking piece 48D
An engagement hole 481 for locking the lower end of the spring 49 is provided at the center of the spring 49. Locking pieces 52L and 52R bent in the Z-axis direction are formed at the left and right ends of the lower end of the Y-axis support plate 40. Locking pieces 52L and 52R
An engagement hole 521 for locking the left end and the right end of the spring 38 in a state of being bowed via the support piece 36 is provided at the center of the spring 38. As a result, as shown in FIG. 4, the bar-shaped spring 38 is bent in an arc shape, and a biasing force in the Y-axis upward direction is applied to the Y-axis support plate 40 against the fixed plate 29.

The X-axis support plate 53 has a square shape, and a square window hole 54 slightly larger than the display surface 10a of the liquid crystal panel 10 is formed in the center. A screw hole 55 to which the screw 26 can be screwed is screwed at two places at the upper part and one place at the lower part of the window hole 54, and is further above the two screw holes 55 at the upper part, and is provided at the left dowel 43L. A horizontally long left dowel hole 56L is formed at a position facing the right dowel hole 56R, and a horizontally long right dowel hole 56R is formed at a position facing the right dowel 43R. At the right end on the upper end side of the X-axis support plate 53, a contact piece portion 57 that is bent in the Z-axis direction and has a contact surface whose upper half is inclined in the X-axis direction is provided.

Projecting pieces 58, 59R and 59L for alignment at the time of stacking and fixing with other support plates are provided at the center of the upper end side of the X-axis support plate 53 and at the lower part of the left and right end sides.
Is provided. Further, a locking piece 48U bent in the Z-axis direction is formed in the upper part of the left end side of the X-axis support plate 53, and an engagement hole for engaging the upper end of the rod-shaped spring 49 is formed in the center thereof. 481 are formed. Then, as shown in FIG. 4, the bar-shaped spring 49 is bent in an arc shape by the support piece 47 and the locking pieces 48U and 48D, and the Y-axis support plate 40 is bent.
In contrast, the X-axis support plate 53 is provided with a biasing force in the X-axis positive direction.

The upper part 2 of the display surface 10a of the liquid crystal panel 10
The screw hole 55 of the X-axis support plate 53
, A hole 60 for inserting the screw 26 is formed.

In FIG. 5, a clip 61 is a U-shaped clip. On one side of the inner surface, a groove into which each of the protruding pieces 58, 59L and 59R shown in FIG. 62 are formed. The left dowel 43L and the right dowel 4L
The 3R, the left dowel hole 56L, the right dowel hole 56R, the midpoint of the slope of the contact portion 57, and the lower end of the adjusting screw 45 are designed to be aligned in the X-axis direction as shown in FIG.

Next, the operation of the present embodiment will be described.

First, the operation of the liquid crystal projector itself will be described. Returning to FIG. 2, the light beam of the randomly polarized light radiated from the light source 1 is reflected by the IR-IR light together with the light reflected by the reflection surface 2a of the parabolic mirror 2. The UV cut filter 3 removes unnecessary wavelength regions for the three RGB wavelength bands. The light from which the unnecessary wavelength band has been removed is split into a plurality of light beams by the first lens array 4.

Each of the plurality of light beams split by the first lens array 4 is converted by a polarizing beam splitter 5 into a first linearly polarized light beam 6 and a second linearly polarized light beam whose polarization directions are orthogonal to each other. 7 is separated. That is, the light beam coming from the exit surface of the first lens array 4 passes through the polarization beam splitter 5 straight as incident light. The first linearly polarized light component of the incident light is
At a, the light is reflected at a right angle to the incident angle of 45 degrees and emitted as a light beam 6. In addition, a second light beam that passes through the optical path generated by the thickness 5b without being reflected by the polarization separation surface 5a and travels straight further.
The incident light of the linearly polarized light component is reflected by the total reflection surface 5c at a right angle to the incident angle of 45 degrees, and exits as a light flux 7.

The plurality of light beams 6 and the plurality of light beams 7 are respectively divided by the first lens array 4 in the vicinity of the second lens array 8 by the image forming action of the first lens array 4. The same number of small light sources is formed.
Here, of the small light sources formed on the second lens array 8, a half-wave plate 9 is attached to the exit surface of the second lens 8 a where the small light source formed by the light flux 7 is located. Therefore, the polarization direction of the second linearly polarized light component of the light beam 7 is converted into the polarization direction of the first linearly polarized light component of the light beam 6,
The polarization directions of all the small light sources are aligned.

Light beams emitted from the second lens array 8 to which the half-wave plate 9 is attached and whose polarization directions are aligned are separated by the dichroic filters 13 and 16 into wavelength bands of three colors of RGB. That is, the luminous flux in the wavelength band of B separated by the dichroic filter 13 is reflected by the total reflection mirror 14 and transmits through the field lens 15, and then illuminates the liquid crystal panel 10. The light beams in the R and G wavelength bands pass through the dichroic filter 13, and the light beam in the G wavelength band is reflected by the dichroic filter 16 and illuminates the liquid crystal panel 11 after passing through the field lens 17. The luminous flux in the R wavelength band passes through the dichroic filter 16 and is guided to a relay optical system including two lenses 18 and 19 and two total reflection mirrors 20 and 21, and then passes through a field lens 22. The liquid crystal panel 12 is illuminated. Here, the liquid crystal panel 1
The distance between the second lens array 8 and the second lens array 8 is
Since the distance between 0 and 11 and the second lens array 8 is different, the illumination state of the liquid crystal panel 12 is made equal to the illumination state of the other liquid crystal panels 10 and 11 by using the lenses 18 and 19 of the relay optical system. Like that.

The optical images formed by each of the three liquid crystal panels 10 to 12 are synthesized by the dichroic prism 23. That is, the optical image of B formed by the liquid crystal panel 10 passes through the dichroic prism 23 as light incident on the dichroic prism 23, and is reflected by the first dichroic mirror 23b at a right angle to the incident angle of 45 degrees. The light is emitted toward the projection lens 24. LCD panel 12
The R optical image formed by the above also transmits straight through the inside as the incident light of the dichroic prism 23, is reflected by the second dichroic mirror 23c at a right angle to the incident angle of 45 degrees, and is directed toward the projection lens 24. And inject. The G optical image formed by the liquid crystal panel 11 passes through the inside of the dichroic prism 23 as incident light and travels straight through the first and second dichroic mirrors 23b, 23b.
The light further travels straight through without being reflected by 23 c and is emitted toward the projection lens 24.

Thus, the three liquid crystal panels 10 to 10
The optical image formed by each of the optical elements 12 is synthesized by being emitted toward the projection lens 24 in the same direction with the optical axes aligned. The synthesized optical image is enlarged and projected on a screen by the projection lens 24.

Here, the assembly of the liquid crystal panel 10 and its supporting and adjusting mechanism will be described with reference to FIG. The liquid crystal panel 10 is placed on the front surface of the X-axis support plate 53 with the incident surface facing upward, and the three holes 60 of the liquid crystal panel 10 and the three screw holes 55 of the X-axis support plate 53 are formed. The screws 26 are inserted into the holes 60 by adjusting the positions, and screwed. Thus, the liquid crystal panel 10 is attached to the X-axis support plate 53. The bar-shaped spring 49 (see FIG. 4) is parallel to the Y-axis, and the lower end thereof is engaged with the engaging hole 481 from the outer surface of the engaging piece 48D. It catches in the groove of the part 50.

Next, the left dowel 43L and the right dowel 43R are respectively moved from the surface of the locking piece 48U on the side facing the window hole 54 while the upper end of the rod spring 49 is engaged with the engaging hole 481. The X-axis support plate 53 is superposed on the front surface of the Y-axis support plate 40 so as to fit into the dowel hole 56L and the right dowel hole 56R.

Thereafter, from the lower surface of the locking piece 52L,
One end of the rod-shaped spring 38 is hooked on the engagement hole 521, and similarly,
The other end of the bar spring 38 is engaged with the engagement hole 521 of the locking piece 52R. Then, while hooking the center portion of the rod-shaped spring 38 on the support piece 39, the left dowel 31L and the right dowel 31R
Are fitted in the left dowel hole 42L and the right dowel hole 42R, respectively, and the Y-axis support plate 40 is superposed on the front surface of the fixing plate 29. Next, the support plates 40 and 53 laminated on the fixing plate 29 are aligned with the fixing plate 29, and in this state, the respective portions of the projecting pieces 58, 59L and 59R are fastened with the clips 61. By this, three boards,
It is restricted that they are shifted from each other in the Z-axis direction.

The same applies to the mounting of the liquid crystal panel 12. Since the attachment of the liquid crystal panel 11 is clear, the description thereof is omitted. The support mechanism for mounting the liquid crystal panel 11 and the support adjustment mechanism for mounting the liquid crystal panels 10 and 12, respectively, as shown in FIG.
3 attached. Then, the adjusting screw 33L, the adjusting screw 33R, and the adjusting screw 45 are supported by the support pieces 32L, 32R.
And attached to the contact piece 44R.

Subsequently, the directionality (X, Y, θ) of the optical image
The adjustment of the support adjustment mechanism to make the adjustments coincide will be described. In the present embodiment, the G liquid crystal panel 11 serves as a reference for positioning an optical image. That is, the directions of the optical images of the liquid crystal panel 10 and the liquid crystal panel 12 may be made to coincide with the directions of the optical images of the liquid crystal panel 11, and the three optical images may be accurately superimposed.

1. Adjustment of Y axis and angle θ FIG. 6 is an explanatory diagram of adjustment of Y axis and angle θ.
This will be described with reference to FIG. Since the Y-axis support plate 40 is always pushed up in the Y-axis negative direction by the bar spring 38 shown in FIG. 4, the contact pieces 44L and 44R are respectively connected to the support pieces 32L and 32R of the fixed plate 29. The lower end of the screw 33L and the lower end of the adjustment screw 33R are in contact with each other. Therefore, when the adjusting screw 33L is turned and the lower end thereof is moved by a desired dimension in the positive direction (downward) of the Y-axis, the upper surface of the contact piece 44L is pushed down by the adjusting screw 33L, and the Y-axis support plate 40 Rotates counterclockwise on the XY plane. Conversely, turn the adjusting screw 33L and move its lower end to Y
When a desired dimension is moved in the negative direction of the shaft, the locking piece 52L shown in FIG. 3 is pushed up by the rod-shaped spring 38, so that the Y-axis support plate 40 rotates clockwise on the XY plane. The same applies to the function of the adjusting screw 33R. However, the turning direction of the Y-axis support plate 40 by the adjusting screw 33R is opposite to the turning direction by the adjusting screw 33L.

By turning the adjustment screws 33L and 33R in the same direction by the same amount, the entire liquid crystal panels 10 and 12 move in the Y direction.

Therefore, the adjusting screw 33L and the adjusting screw 33
By adjusting the amount of rotation and the direction of rotation with respect to R, the liquid crystal panels 10 and 12 can be moved in the positive and negative directions of the Y axis, and can be rotated clockwise or counterclockwise on the XY plane by a predetermined angle. Can be rotated. Thereby, the angle θ axis of each axis on the XY plane of each optical image of the liquid crystal panels 10 and 12 can be matched with the angle of each axis on the XY plane of the optical image of the liquid crystal panel 11. The position of each optical image 12 in the Y-axis direction on the XY plane can be matched with the position of the liquid crystal panel 11 in the Y-axis direction.

2. Adjustment of X-axis The adjustment of the X-axis will be described with reference to FIG. Since the X-axis support plate 53 is constantly pressed in the negative direction of the X-axis by the rod-shaped spring 49, the contact piece 57 is screwed to the contact piece 44R of the Y-axis support plate 40. It is in contact with the lower end of the component adjusting screw 45 at an angle of about 45 degrees. The left dowel hole 56L and the right dowel hole 5L
Since the vertical inner diameter of 6R is approximately equal to the width of the outer diameter of left dowel 43L and right dowel 43R, the X-axis support plate 53 can move only in the positive and negative directions of the X-axis. Therefore, when the adjustment screw 45 is turned and its lower end is moved by a desired dimension in the positive direction of the Y axis, the contact piece 57
Is pushed down, and the X-axis support plate 53 moves in the positive direction of the X-axis. On the other hand, when the adjusting screw 45 is turned in the opposite direction to the above and the lower end thereof is moved by a desired dimension in the negative direction of the Y-axis, the contact piece 57 rises.
Is pushed in the negative direction of the X axis by the spring 49 and moves in that direction.

Therefore, by adjusting the adjustment screw 45, the liquid crystal panels 10, 12 can be moved in the positive and negative directions of the X axis. Thus, the position of each optical image of the liquid crystal panels 10 and 12 in the X-axis direction on the XY plane is set to the X-axis position of the liquid crystal panel 11.
It can be adjusted to the axial position.

In this embodiment, as shown in FIG. 7, the adjusting screw 45 is set so as to press the upper half of the contact piece 57 at an inclination angle of about 45 degrees. As shown in FIG. 5, the right end of the contact piece 44R including the screw hole 46 (see FIG. 3) may be bent clockwise at an angle of 10 degrees or less with respect to the left end. As a result, the force applied to the contact piece 57 by the adjusting screw 45 includes more positive components in the X-axis direction, and the frictional force is reduced, so that the X-axis support plate 53 can be more smoothly moved. It can be moved in the positive direction of the X axis.

In this embodiment, the rod springs 38,
Instead of 49, an elastic member such as a leaf spring or a spring-like spring may be used.

In the present embodiment, the fixing plate 29, Y
Although the shaft support plate 40, the X-axis support plate 53, and the liquid crystal panel 10 are placed and fixed in this order, the fixed plate, the X-axis support plate,
The Y-axis support plate and the liquid crystal panel may be placed and fixed in this order.

In this embodiment, the springs 38, 49
However, a member such as an adhesive that is deformed and solidified by pressing by adjustment may be used.

Further, in the present embodiment, dowels 31L, R
Although the movement in the Y-axis direction is regulated by using the dowel holes 42L and 42R, the movement may be regulated by a pair of dowels and dowel holes.
In particular, they need not be provided.

[0052]

As is clear from the above, according to the present invention, the θ angle, the X axis and the Y axis can be adjusted without increasing the number of parts.

[Brief description of the drawings]

FIG. 1 is a perspective view of a part of a liquid crystal projector according to an embodiment of the present invention, which includes a liquid crystal panel, a support adjustment mechanism, a dichroic prism, and a projection lens.

FIG. 2 is an overall configuration diagram of a liquid crystal projector according to the present invention.

FIG. 3 is an assembly configuration diagram of a liquid crystal panel and a support adjustment mechanism thereof.

FIG. 4 is an assembled perspective view of a liquid crystal panel and a support adjustment mechanism thereof.

FIG. 5 is a perspective view of a clip.

FIG. 6 is an explanatory diagram of the adjustment operation of the Y axis and the θ angle.

FIG. 7 is an explanatory diagram of an X-axis adjustment operation.

FIG. 8 is a diagram showing a state where the X component adjusting screw is tilted clockwise at an angle of 10 degrees or less.

[Explanation of symbols]

 10, 11, 12 Liquid crystal panel 23 Dichroic prism 24 Projection lens 25, 29 Fixing plate 26, 28 Screw 35L / R Mounting part 30, 41, 54 Window hole 31L / R, 43L / R Left / right dowel 32L / R Support piece Part 34, 46, 55 Screw hole 36, 47 Support piece part 37, 60 hole 38, 49 Rod spring 40 Y support shaft support plate 42L / R, 56L / R Left / right dowel hole 44L / R Contact piece part 45 Adjustment Screw 48U / D, 52L / R Locking piece 53 X-axis support plate 57 Contact piece 58, 59L / R Protruding piece 61 Clip

Claims (1)

[Claims] 1. A liquid crystal projector which irradiates an optical image of each color from a liquid crystal panel formed in accordance with each video signal with illumination light, synthesizes the image with a dichroic prism, and projects the image on a screen. Is supported by a support adjustment mechanism, and the support adjustment mechanism is a first plate-shaped member provided with a window hole through which an optical image passes, and is provided on one side in the Y-axis direction. A fixed portion to which the first and second adjustment members are movably attached in the Y-axis direction and a window through which an optical image passes are formed at an end of the first plate-shaped member. A second plate-shaped member having a regulating portion formed in the X-axis direction and having first and second contact portions which are pressed by the first and second adjustment members, On the same side as the first and second adjustment members, a third A first support portion which is mounted so as to be movable substantially in the direction of the Y-axis, and which moves in accordance with the pressure received by the first and second contact portions; and a window through which an optical image passes. Is formed, and an engagement portion that engages with the restriction portion is formed, and a third contact portion that is pressed by the third adjustment member on a surface inclined in the X-axis direction is formed. A third support member, wherein the movement is restricted in the X-axis direction by the restricting portion and the engaging portion, and the second supporting portion moves in accordance with the pressure received by the third contact portion. Characteristic liquid crystal projector.