JPH10268448A - Fixing method and structure for optical system constituting part of liquid crystal video projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing method and a structure for the optical system constituting parts of a liquid crystal video projection device by which accurate positioning and setting can be performed based on the specified arrangement of an optical system. SOLUTION: A recessed part 21 to which the both-side edge parts of the optical system constituting part are inserted and held, and plural projections 22 abutting on a lower side edge part are formed on a fixed base 20, and the part 21 restricts the dispersion of the position of an upper side edge part caused by tilt when the optical system constituting part is inserted. Thus, the optical system constituting part can be arranged on the base 20 with a simple operation. At least one or more projections 32 abutting on the upper side edge part of the optical system constituting part and performing positioning are formed on a fixed lid 30; and the projections 32 abut on the reflecting surface of the optical system constituting part, press the optical system constituting part in a non-reflecting surface direction, position and fix it when the cap 30 is attached to the base 20. Thus, an attaching position and an attaching angle can be accurately set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal projection apparatus for enlarging and projecting an output image of a personal computer, a word processor or the like onto a screen as it is, and more particularly to a plurality of mirrors constituting an optical system for guiding light from a light source to a liquid crystal panel. It relates to a fixing method and its structure.

[0002]

2. Description of the Related Art Heretofore, there has been known a liquid crystal video projection apparatus for synthesizing a color image on a screen using a transmissive liquid crystal panel of red, green and blue.

In this liquid crystal video projection apparatus, as disclosed in Japanese Utility Model Laid-Open Publication No. 1-63276 and FIG. 4, the light from a light source is translucent or totally reflected so that each color of red, green and blue is obtained. In general, the light is separated into light, and the separated color light is transmitted through a transmissive liquid crystal panel arranged on each optical path, then is color-combined by a dichroic prism, and the combined light is enlarged and projected on a screen through a projection lens. Has been awarded.

A plurality of dichroic mirrors, total reflection mirrors and the like are usually arranged on the optical path of the color light transmitted through the transmissive liquid crystal panel in accordance with a predetermined arrangement of the optical system. Of these, components constituting an optical system such as a lens that restricts only visible light and transmits the same and a convergent lens disposed on an optical path of color light are also configured. The components constituting these optical systems are arranged on a fixed base together with the dichroic prism and the transmissive liquid crystal panel.

Further, as a method of attaching the optical system components to the fixing table, there is a method of fixing a mirror disclosed in Japanese Patent Application Laid-Open No. 5-72455.

According to the technique disclosed in the above publication, the mounting positions and angles of mirrors such as a dichroic mirror and a total reflection mirror are kept constant, these mirrors are mounted on a fixed frame, and the fixed frame is screwed to the fixed base. The purpose of the present invention is to prevent color non-uniformity (non-uniformity of illumination light) due to the fact that the mirror is not accurately fixed, thereby improving image quality.

[0007]

The method of fixing a mirror as described above is performed by forming a groove in a fixing base, forming a projection on a fixing frame, and pressing one surface of the projection against the wall surface of the groove. Is fixed with screws or the like. However, this fixing method requires a fixing frame, and the work of attaching a mirror to the fixing frame and screwing it to the fixing base is complicated, and it has been a problem to improve workability. Further, since the fixing frame is fixed to the fixing base by screwing, the mounting position and the mounting angle of the mirror are set by the screwing position or the screw tightening force of the fixing frame. Therefore, to position and accurately set components such as mirrors based on the predetermined arrangement of the optical system,
Setting the mirror through the fixed frame and screwing the fixed frame has a disadvantage that the accuracy of the fixed position and angle of the mirror is reduced. The present invention solves the above-mentioned drawbacks of the conventional mirror fixing method.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a concave portion for inserting and holding both side edges of an optical system component on a fixed base and a plurality of recesses contacting a lower side edge. A projection is formed, and at least one projection is formed on the fixed lid so as to be in contact with the upper edge of the optical system component and positioned.
Thereby, the variation in the position of the upper side edge portion due to the fall when the optical system component is inserted into the concave portion formed in the fixing base is limited. When the fixed lid is attached to the fixed base, the optical system components are urged toward the non-reflective surface by the contact of the projections formed on the fixed lid with the reflective surface, and are positioned and fixed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal projection device according to one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing the fixed base seen from the fixed lid side, and FIG. 2 is a plan view showing the fixed base seen from the fixed base side. 1 and 2, the screen and the projection lens for enlarging and projecting the color image synthesized on the screen are not shown.

First, the light from the light source is decomposed into red, green, and blue light, and each of the decomposed color lights is irradiated on the liquid crystal panel.

Light L0 incident from the light source 1 passes through the first lens 2a, where ultraviolet rays are cut, reflected by the total reflection mirror 3, and further, infrared rays are cut through the second lens 2b. Thus, the light from the light source is only visible light.

Thereafter, the visible light is color-separated by the dichroic mirror 4a, the red light (R) is transmitted and travels toward the optical path L1, and the other color lights are reflected and travel toward the optical path L2. Then, in the optical path L1, the red light (R) transmitted through the dichroic mirror 4a advances and is reflected by the total reflection mirror 5a, then transmits through the third lens 6a, and furthermore, the two red polarizing plates 7a, After passing through 7a, it passes through liquid crystal panel 8a.

In the optical path L2, other color lights are separated by the dichroic mirror 4b, green light (G) is reflected and travels toward the optical path L3, and blue light (B) is transmitted and travels toward the optical path L4. Go on. And the optical path L3
Then, the reflected green light (G) transmits through the third lens 6b, further transmits through the two green polarizing plates 7b, 7b, and then transmits through the liquid crystal panel 8b.

On the optical path L4, the blue light (B) transmitted through the dichroic mirror 4b is reflected by two total reflection mirrors 5.
b, 5c, and pass through relay lenses 9a, 9b that adjust the convergence of light on the optical path due to the reflection. Then, the transmitted blue light (B) transmits through the third lens 6c, further transmits through the two blue polarizing plates 7c, 7c, and then transmits through the liquid crystal panel 8c.

In this manner, the red, green, and blue light beams transmitted through the liquid crystal panels 8a, 8b, and 8c provided in the optical paths L1, L3, and L4 respectively pass through the dichroic prism 1.
After being combined with a color image by 0, the combined light is enlarged and projected on a screen by a projection lens (not shown).

On the other hand, the components constituting the above-described optical system include:
It is arranged on the fixed base 20 based on a predetermined position of the optical system,
The fixed base 20 is provided on a base (not shown) of the liquid crystal projection device. Here, among the components making up the optical system as described above, especially, the mirrors of the dichroic mirror and the total reflection mirror, etc., have misalignments in their mounting positions and angles, which cause color unevenness (illumination light unevenness) and degrade image quality. Let it. Therefore, in the present embodiment, in particular, for the optical system components such as mirrors, the fixed lid 30 shown in FIG. It is arranged on the fixed base 20. Then, by fixing the fixing cover 30 so as to face the fixing base 20 and attach it, the optical system components such as the mirror are positioned and fixed at the same time.

Hereinafter, a fixing method and a fixing structure of the optical system component will be described.

First, in FIG. 1, a concave portion 2 for inserting and holding both side edges of the above-mentioned optical system component is mounted on a fixing base 20.
1 and 21 are formed at positions corresponding to the respective side edges. Further, on the bottom surface of the fixing base 20, a plurality of protrusions 22 for positioning the lower side edge of the optical system component are formed at two or more places at a predetermined interval or an equal interval with respect to the interval between both side ends. Is done.

The fixing base 30 shown in FIG.
Similarly to 0, concave portions 31, 31 for inserting and holding both side edges of the optical system component are formed at positions corresponding to the respective side edges. Also, the projection 3 for positioning the upper edge of the optical system component with respect to the bottom surface of the fixed lid 30.
2 are formed at least at one position with respect to the interval between both side edges.

3A and 3B are explanatory views for explaining a concave portion for inserting and holding the optical system component and a projection for positioning. FIG. 3A is a perspective view of the concave portion, and FIG. It is the side view seen. FIG. 4 is an explanatory view for explaining a projection for positioning and fixing an optical system component. For convenience of explanation, the recesses for inserting and holding both side edges of the optical system component are respectively arranged in the same shape and opposed to the side edges, so that one side of the optical system component is provided. A description will be given of the concave portion with respect to the edge.

In FIG. 3A, a concave portion 21 and a concave portion 31 for inserting and holding both side edges Ms of the optical system component M are respectively formed in the fixing base 20 and the fixing lid 30 in a U-shaped cross section. It is formed with a place.

The recess 21 and the recess 31 are respectively formed in the first recess 21 into which the end Mst of the side edge Ms is inserted.
a, 31a, and second recesses 21b, 31b for guiding the peripheral edge to the first recess at the time of insertion.
The a and 31a are formed to have a width W1 slightly larger than the thickness W0 of the optical system component M (a recess width 0.05 mm larger than the thickness of the optical system component M in the embodiment).

As shown in FIG. 3B, the second recess 21b
And 31b are respectively the first recesses 21a, 31b.
and is formed to have inclined surfaces 21c and 31c. Then, the inclined surface 21c formed in the second recess 21b
Of the inclined surface 31 formed in the second recess 31b.
c is formed to be larger than the inclination angle C.

With this arrangement, when the optical system component M is inserted into the first recess 21a of the concave portion 21 when the optical system component M is prepared for mounting on the fixing base 20, the variation due to the inclination is reduced by the inclined surface. 21c so that the positions of the upper side edges Mu are substantially the same. Then, when the fixed lid 30 is attached, the upper edge Mu of the optical system component M is slidably brought into contact with the inclined surface 31c of the concave portion 31 to be almost simultaneously inserted into the first concave portion 31a.

That is, the optical system component M includes the inclined surface 2
Due to the difference between the inclination angle B of 1c and the inclination angle C of the inclined surface 31c, the work for attaching the fixed lid 30 to the fixed base 20 is easily performed.

The fixed base 20 has an optical system component M
Are formed at a plurality of positions (two positions in the embodiment) of the lower side edge portion Md at equal or predetermined intervals at a position where the protrusions 22 and 22 are in contact with the reflection surface. Further, the fixed lid 30
Also, at least one protrusion 32 is formed on the upper side edge Mu at a position where it comes into contact with the reflection surface of the optical system component M.

Accordingly, the optical system component M is inserted while the projection 32 abuts on the reflecting surface in accordance with the attachment of the fixing cover 30 to the fixing base 20, so that the lower side is simultaneously formed with the upper side edge Mu. The edge Md is also urged toward the non-reflective surface.

That is, as shown in FIG. 4, the optical system component M urges the reflecting surface in one direction by the projections 22 and 22 on the lower edge Md and by the projection 32 on the upper edge Mu. Thus, the position and the angle are accurately set based on the arrangement of the optical system.

[0030]

As described above, according to the present invention, the recess 21 for inserting and holding the both side edges of the optical system component on the fixing base 20 is provided.
And a plurality of projections 22 that are in contact with the lower side edge portion, and the concave portion 21 limits variation in the position of the upper side edge portion due to the fall when the optical system component is inserted. The optical system components can be arranged on the fixed base 20 by a simple operation of simply inserting the optical system components into the recess 21.
Therefore, it is possible to omit the assembling work of mounting the optical system component on the fixed frame and screwing the fixed frame to the fixed base as in the related art.

Also, at least one projection 32 for positioning the fixed lid 30 in contact with the upper side edge of the optical system component.
When the fixing lid 30 is attached to the fixing base 20, the projection 32 urges the optical system component toward the non-reflective surface by abutting the optical system component against the reflective surface, and the positioning is performed. Since the optical system components are fixed, the mounting positions and angles of the optical system components can be accurately set based on the arrangement of the optical system. Therefore, the work of adjusting the mounting position and the angle of the optical system component when attaching the fixed lid to the fixed base as in the related art can be eliminated.

[Brief description of the drawings]

FIG. 1 is a plan view of a fixing base on which optical system components are arranged in a liquid crystal projection device according to the present invention, as viewed from a fixing lid side.

FIG. 2 is a plan view of a fixing lid in the liquid crystal projection device of the present invention as viewed from a fixing table side.

3A and 3B are explanatory views illustrating a concave portion for inserting and holding an optical system component and a projection for positioning the liquid crystal projection device according to the present invention, FIG. 3A is a perspective view thereof, and FIG. It is the side view seen from A direction.

FIG. 4 is an explanatory view illustrating a projection for positioning and fixing an optical system component in the liquid crystal projection device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 fixing base 21 recess (fixing base 20) 21a first recess (fixing base 20) 21b second recess (fixing base 20) 21c inclined surface (fixing base 20) 22 protrusion (fixing base 20) 30 fixing lid 31 recess (Fixed lid 30) 31a First recess (fixed lid 30) 31b Second recessed (fixed lid 30) 31c Inclined surface (fixed lid 30) 32 Projection (fixed lid 30) M Optical system component Ms Side edge Md Lower edge Mu Upper edge

Claims (5)

[Claims] The light from a light source is decomposed into red, green, and blue light, and the decomposed color light is transmitted to each transmissive liquid crystal panel and synthesized by a dichroic prism. In a liquid crystal video projection apparatus for enlarging and projecting on a screen, on a light path of each of red, green, and blue color lights guided to the transmission type liquid crystal panel, at least a predetermined color light of light incident from the light source is transmitted. An optical system is constituted by a dichroic mirror that reflects the light of the color and a total reflection mirror that totally reflects the light incident from the light source, and a concave portion is formed to insert and hold both side edges of these optical system components. And a fixing table provided with a plurality of projections abutting on the lower side edge of the optical system component, and positioned on the upper side edge of the optical system component. The fixing lid has at least one projection provided thereon, and the fixing lid has one side of the optical system component facing the other side by the insertion of the projection accompanying attachment to the fixing base. A method of fixing an optical system component of a liquid crystal video projection device, characterized in that the device is energized. 2. The liquid crystal according to claim 1, wherein one surface of said optical system component urged by said projection is a reflection surface, and the other surface of said optical system component is a non-reflection surface. A method for fixing an optical system component of a video projection device. 3. The light from a light source is decomposed into red, green, and blue color lights, and the decomposed color lights are transmitted through respective transmissive liquid crystal panels and are synthesized by a dichroic prism. In a liquid crystal video projection apparatus for enlarging and projecting on a screen, on a light path of each of red, green, and blue color lights guided to the transmission type liquid crystal panel, at least a predetermined color light of light incident from the light source is transmitted. An optical system is configured by a dichroic mirror that reflects the light of the color and a total reflection mirror that totally reflects the light incident from the light source, and a concave portion and a lower portion for inserting and holding both side edges of these optical system components. A fixed base having a plurality of projections abutting on a side edge, and at least one projection for abutting and positioning on an upper edge of the optical system component are formed. When the fixed lid is attached to the fixed base, a projection formed on the fixed lid abuts one surface to position the optical system component and attaches it to the other surface. A structure for fixing optical system components of a liquid crystal video projection device, wherein 4. The liquid crystal according to claim 3, wherein one surface of the optical system component urged by the projection is a reflective surface, and the other surface of the optical system component is a non-reflective surface. Fixing structure of optical system components of video projection device. 5. The concave portion is formed with a concave width slightly larger than the thickness of the optical system component, and the extending end of the concave portion limits variation in the position of the upper edge of the optical system component. 4. The structure for fixing an optical system component of a liquid crystal video projection device according to claim 3, wherein the structure is formed as an inclined surface.