JPH07301777A - Liquid crystal projector device - Google Patents

Abstract

PURPOSE:To provide a notch on a dichroic mirror and a mirror so as to easily distinguish between them and to provide a projection at an attaching spot so as to prevent them from being inadvertently attached. CONSTITUTION:The corner parts of the dichroic mirrors 4, 6, 14 and 16 and mirrors 5 and 15 are cut or the notch is provided at the edges thereof; and the projection corresponding to the shape of the cutting or the notch is provided at the spot of the housing where they are attached; then the position or the shape of the notch is made different every dichroic mirror, so that the direction of the dichroic mirror is discriminated and the dichroic mirror is prevented from being inadvertently attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector device, and more particularly to a device for facilitating mounting or adjustment of a dichroic mirror and a mirror.

[0002]

2. Description of the Related Art In a three-panel liquid crystal projector device composed of a light source, a color separation optical system, a liquid crystal panel, an image combining optical system and a projection optical system, white light from a light source is converted into red light by a dichroic mirror of the color separation optical system. It is divided into three colors, green and blue, and each liquid crystal panel corresponding to each color is irradiated, and the light image-modulated by the video signal for each color in each liquid crystal panel is image-combined by the dichroic mirror and mirror of the image composition optical system. , Display the image by projecting it on the screen with the projection lens. In this way, the dichroic mirror has different transmission / reflection characteristics depending on the resolution / composite color, and if the wrong type is attached, a normal projected image cannot be obtained. Since the dichroic mirror and the mirror that are combined combine the three color image lights generated by the three liquid crystal panels into one, it is possible to prevent color deviation in the image projected on the screen, that is, In order to make the three images similar, the angle of the reflection surface must be accurate.

In order to improve the mounting accuracy of these dichroic mirrors or mirrors, it is conceivable that the dimensional tolerance of each component will be tightened, but demanding high dimensional precision lowers the yield of the components and raises the cost. There's a problem. Also, the dichroic mirrors have different transmission / reflection characteristics (differences in what colors are transmitted and what colors are reflected), and since mirrors with the same shape as these dichroic mirrors are also used, they can be assembled. An unfamiliar worker has a problem that it is difficult to distinguish these, and the front and back are confused.

[0004]

In view of the above, the present invention provides notches at the edges or corners that do not affect the color separation or image composition of the dichroic mirrors and the mirrors, and determines the front-back direction and type. Do not make a mistake, or install a protrusion corresponding to these notches in the mounting position to prevent accidental mounting, and increase the size and shape accuracy of only one axial direction of the dichroic mirror etc. The purpose is to adjust the axial direction by a simple operation so that the yield of parts is good and high mounting accuracy is obtained.

[0005]

In order to solve the above-mentioned problems, the present invention provides a three-plate liquid crystal projector device comprising a light source, a color separation optical system, a liquid crystal panel, an image combining optical system and a projection optical system. Notches are provided at the corners of the dichroic mirror and the mirror that are attached to the optical system and the image synthesizing optical system, and protrusions corresponding to the shapes of the notches are provided at the mounting positions of the dichroic mirror and the mirror, respectively. It is intended to provide a liquid crystal projector device in which the notch and the protrusion prevent the mounting direction from being erroneous when mounted.

[0006]

With the above construction, in the liquid crystal projector device according to the present invention, the dichroic mirror and the mirror can be distinguished in the type and the front-back direction by the notches formed at the edges or corners. A protrusion having a shape corresponding to the cutout is provided at a position corresponding to the cutout to prevent erroneous mounting. Further, the mounting accuracy of the dichroic mirror and the mirror is, for example, by increasing the dimensional accuracy of the parts so that the horizontal angle is high and adjusting the vertical angle at the time of assembly, the component cost and We will be able to reduce both the assembly time.

[0007]

Embodiments of the liquid crystal projector device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration diagram of a main part of an embodiment of a liquid crystal projector device according to the present invention. In the figure, 1 is a light source, 2 is a reflector, and 3 is a cold filter. White light from a metal halide lamp or the like of the light source 1 is condensed by the reflector 2, and ultraviolet rays and infrared rays are cut by the cold filter 3. Four
Is a dichroic mirror that transmits red (R) light.
A total reflection mirror 5 reflects the light from the dichroic mirror 4. A dichroic mirror 6 reflects G light and transmits B light among the green (G) light and blue (B) light reflected by the dichroic mirror 4. The dichroic mirrors 4 and 6 and the mirror 5 constitute a color separation optical system. Reference numeral 7 denotes a box body on which the components of these color separation optical systems are mounted.

Reference numerals 8, 10 and 12 are condenser lenses, and 9
Is a liquid crystal panel for R image, 11 is a liquid crystal panel for G image,
Reference numeral 13 denotes a liquid crystal panel for B image. Each liquid crystal panel for each color is driven by a video signal for each color and modulates light from a condenser lens to generate image light of each color.

A dichroic mirror 14 transmits the R image light from the liquid crystal panel 9 and reflects the G image light from the liquid crystal panel 11. A total reflection mirror 15 reflects the B image light from the liquid crystal panel 13. 16 is a dichroic mirror,
The R image light and the G image light from the dichroic mirror 14 are transmitted, and the B image light from the total reflection mirror 15 is reflected.
The dichroic mirrors 14 and 16 and the mirror 15 constitute an image combining optical system. Reference numeral 17 is a box in which the components of these image synthesizing optical systems are mounted. A projection lens 18 projects the image light combined by the dichroic mirror 16 onto a screen (not shown).

The dichroic mirrors 4, 6, 14, 1
6. As shown in FIG. 2, the mirrors 5 and 15 are cut at the corners 21 which do not interfere with the transmission / reflection of light, and the boxes 7 and 17 for mounting these dichroic mirrors and the like are cut. A protrusion 22 having a shape corresponding to the cut 21 is provided at a position corresponding to 21 to prevent the dichroic mirror or the like from being mounted in the opposite direction. Alternatively, a notch 23 is provided at the edge of the dichroic mirror or the like, and a protrusion having a shape corresponding to the position corresponding to the notch 23 of the boxes 7 and 17 is formed.
Provide 24. The notch 23 and the protrusion 24 are provided at different positions for each type of dichroic mirror or the like so as to prevent a mounting error. Alternatively, these notches 23 and protrusions
The 24 may have different shapes and may be provided at the same location. By providing these notches and protrusions, even an operator who is unfamiliar with the handling of the dichroic mirror and has difficulty in distinguishing the types can perform the assembly work.

FIG. 3 is a perspective view of a main part of another embodiment of the liquid crystal projector device according to the present invention, and FIG. 4 is a side view of the main part of the tilt adjusting device for the dichroic mirrors 14 and 16 of the image combining optical system. In the figure, reference numerals 4 to 18 are the same as those in FIG. Figure 3
In the case of the structure in which the box body 17 is divided into upper (17) and lower (17 ') as in the example shown in Fig. 4, as shown in Fig. 4, the lower box body 17'
A rib 32 is provided at the mounting position of the dichroic mirrors 14 and 16 on the lower surface side of the dichroic mirrors 14 and 16, and the lower sides of the dichroic mirrors 14 and 16 and the mirror 15 are sandwiched between the plate-shaped biasing spring 33 and the upper sides of the dichroic mirrors 14 and 16 are eccentric. Pin 34 at the tip of pin 31
And the plate-shaped biasing spring 35. Eccentric pin
31 is rotatably provided in a hole formed in the upper surface of the box body 17, a groove is provided in the upper surface, and it can be rotated from the upper surface of the box body 17 by a driver or the like. The position of the pin 34 moves by turning the eccentric pin 31, and the dichroic mirror is clamped by the biasing spring 35.
Make the upper side of 14 etc. move in the front-back direction (left-right direction in the figure).

The rib 32 is set so that an error does not occur in the angle with respect to the optical axis of the dichroic mirror or the like in the left-right direction (front and back directions in FIG. 4), and the eccentric pin 31 is rotated for the vertical angle (tilt). Adjust accordingly. In this way, the yield of the parts is increased by relaxing the dimensional accuracy in the vertical direction, and the adjustment does not become complicated, so that the box body is divided into two parts as in this example. It becomes possible to relax the requirement for the dimensional accuracy of. In this example, the vertical angle error is compensated by adjustment, but the horizontal angle may be adjusted depending on the structure of the box body.

5A and 5B are perspective views of a main part of another embodiment of the liquid crystal projector device according to the present invention. FIG. 5A is a perspective view from above and FIG. 5B is a perspective view from the bottom side. Reference numeral 4 in the figure
18 to 18 are the same as in FIG. Color separation optics, etc. (box 7)
Although it is possible to suppress the distortion of the optical system due to the assembling accuracy by integrally configuring the image forming optical system and the like (the box body 17) with each other, the distortion may occur due to the large shape. Therefore, as shown in the figure, the box body 7 and the box body 17 are connected by the gutter-shaped portion 41 to form an integrated structure, so that the positioning work when mounting each box body on a housing (not shown) is simplified. At the same time, the gutter-shaped portion 41 absorbs mechanical strain between the box body 7 and the box body 17. Alternatively, the box body 7, the box body 17, and the gutter-shaped portion 41 may be integrally formed using a synthetic resin or the like. The liquid crystal panels 9, 11, 13 and the like are mounted on liquid crystal mounting plates 42, 43 and 44, respectively. The upper sides of the liquid crystal mounting plates 42, 43 and 44 are fixed to the box body 17, and the lower side is a trough portion 41. Try to install. Accordingly, it is possible to prevent optical distortion of the liquid crystal panel and the image combining optical system without increasing the strength of each box. In the illustrated example, the gutter-shaped portion 41 has a rectangular cross section, but may have a semicircular shape or a V-shaped shape.

[0014]

As described above, according to the liquid crystal projector device of the present invention, the dichroic mirror and the mirror can be distinguished in type and direction by cutting at the corners or notches at the edges, and the box body Since the protrusion at the mounting position can prevent erroneous mounting, the assembly work will not be hindered even if knowledge of the dichroic mirror or the like is insufficient. Also,
Since the dichroic mirror or the like of the image synthesizing optical system only needs to have high accuracy in either the vertical direction or the horizontal direction, the yield of parts such as boxes can be increased.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of an optical system of an embodiment of a liquid crystal projector device according to the present invention.

FIG. 2 is a partial perspective view of an embodiment of the liquid crystal projector device according to the present invention.

FIG. 3 is a perspective view of a main part of an embodiment of the liquid crystal projector device according to the present invention.

FIG. 4 is a partial side view of a liquid crystal projector device according to the present invention.

FIG. 5 is a perspective view of a main part of another embodiment of the liquid crystal projector device according to the present invention, in which (a) is a perspective view from the top side;
(B) is a perspective view from the bottom side.

[Explanation of symbols]

1 light source 4 dichroic mirror (for red light transmission, green, blue light reflection) 5 total reflection mirror 6 dichroic mirror (for blue light transmission, green light reflection) 7 box 9 liquid crystal panel 11 liquid crystal panel 13 liquid crystal panel 14 dichroic mirror (red) Light transmission, green light reflection) 15 Total reflection mirror 16 Dichroic mirror (for red light, green light transmission, blue light reflection) 17 Box 18 Projection lens 21 Notch 22 Protrusion 23 Notch 24 Protrusion 31 Eccentric pin 34 Pin

Claims (9)

[Claims] 1. A three-plate liquid crystal projector device comprising a light source, a color separation optical system, a liquid crystal panel, an image combining optical system and a projection optical system, wherein a dichroic mirror and a mirror are mounted on the color separating optical system and the image combining optical system. A liquid crystal projector device in which notches are provided at respective corners so that the mounting direction can be identified by the notches when the dichroic mirror or the mirror is mounted. 2. The liquid crystal projector device according to claim 1, wherein the dichroic mirrors of the color separation optical system and the image combining optical system and projections corresponding to the shapes of the cutouts are provided at the mounting positions of the mirrors. 3. A three-plate liquid crystal projector device comprising a light source, a color separation optical system, a liquid crystal panel, an image combining optical system, and a projection optical system, wherein a dichroic mirror and a mirror mounted on the color separating optical system and the image combining optical system. Notch portions having different shapes are provided at the edge portions of the dichroic mirror and the mirror, and a projection portion corresponding to the shape of each notch portion is provided at a position corresponding to each notch portion at each mounting position of the dichroic mirror and the mirror. A liquid crystal projector device capable of identifying the type of dichroic mirror or mirror to be mounted and the mounting direction when mounted. 4. The cutouts are provided at different positions on the edges of the dichroic mirror and the mirror, and the cutouts are provided at positions corresponding to the cutouts at the respective mounting positions of the dichroic mirror and the mirror. The liquid crystal projector device according to claim 3, further comprising a protruding portion. 5. The dichroic mirror and the mirror are provided with cutouts of the same shape at different positions on the respective edges thereof, and the dichroic mirror and the mirror are attached at respective positions corresponding to the cutouts. 4. The liquid crystal projector device according to claim 3, further comprising a protrusion corresponding to 6. A three-plate liquid crystal projector device comprising a light source, a color separation optical system, a liquid crystal panel, an image synthesizing optical system and a projection optical system, wherein at least one side of the dichroic mirror of the image synthesizing optical system and the image synthesizing optical system. The eccentric pin is sandwiched by a sandwiching portion formed on one side of the box body on which parts and the like are mounted, and the side opposite to the one side is sandwiched by an eccentric pin and a biasing spring provided on the other side of the box body. A liquid crystal projector device in which the dichroic mirror or the tilt of the mirror can be changed by rotating the. 7. The dichroic mirror and one of the other dichroic mirrors except one of the mirrors or one side of the mirror is clamped by a clamping part formed on one side of a box part for mounting image combining optical system parts, and the one side. 7. The liquid crystal according to claim 6, wherein a side opposite to is clamped by an eccentric pin and an urging spring provided on the other side of the box body, and the tilt of the dichroic mirror or the mirror can be varied by rotating the eccentric pin. Projector device. 8. A three-plate type liquid crystal projector device comprising a light source, a color separation optical system, a liquid crystal panel, an image combining optical system and a projection optical system, wherein the color separation optical system is mounted first.
A trough-shaped body formed of a box part, a second box part for mounting the liquid crystal panel, the image combining optical system and the projection optical system, and a synthetic resin for connecting the first box part and the second box part And a liquid crystal projector device configured to absorb optical distortion between the liquid crystal panel and the image synthesizing optical system due to distortion of a mounting surface or the like when mounted on a housing or the like by bending of the gutter-shaped portion. . 9. The liquid crystal projector device according to claim 8, wherein the first box body portion, the second box body portion, and the gutter-shaped portion are integrally formed of synthetic resin or the like.