KR20000011867U - Total reflection mirror installation structure of LCD system optical system - Google Patents

Abstract

The present invention improves the workability when the total reflection mirror is installed, and relates to the total reflection mirror installation structure of the liquid crystal projector optical system configured to prevent the total reflection mirror from tilting inside the mirror insertion groove even after a long period of time.

A first support wall having an opening to expose the reflection surface of the total reflection mirror, a second support wall formed at both rear sides of the first support wall to form a mirror insertion groove into which the total reflection mirror is inserted, and a rear surface of the total reflection mirror. A liquid crystal projector provided by means of pressing means such that the front surface of the total reflection mirror of the mirror insertion hole made of the third support wall formed by connecting the end of the second support wall to support the pressure contact with the inner surface of the first support wall. In the total reflection mirror mounting structure of the optical system, the pressing means includes a total reflection mirror support inserted into a space of the mirror insertion groove with an elastic piece elastically contacting at least one of the rear surface of the total reflection mirror and the inner surface of the third wall. Characterized in that made.

Description

Total reflection mirror installation structure of LCD system optical system

The present invention relates to a total reflection mirror mounting structure of an optical system of a liquid crystal projector, and more particularly, improves workability when installing a total reflection mirror, and is configured such that the total reflection mirror is not tilted inside the mirror insertion groove even after a long time. A total reflection mirror mounting structure of a liquid crystal projector optical system.

Today, with the development of the information industry, the demand for image display means having a larger screen has been increasing. However, the direct view cathode ray tube composed of a television receiver screen, which is a conventional image display means, has a cathode ray tube itself in order to enlarge a screen. Due to various realistic constraints that must be produced in large size, there was a limit to the degree of large size.

In addition, even if it is possible to produce a large-sized cathode ray tube to some extent by overcoming the technical difficulties described above, another increase in the production of a television set having a large cathode ray tube on the screen due to the increased load of the cathode ray tube Due to the technical difficulties due to the constraints, there was no limit to the production of a television with a large cathode ray tube on the screen.

Under such a background, a projected projection system such as a projection television or a video projector has been developed and put into practical use to overcome the difficulties of various technical factors and obtain a larger screen.

Such an image projection system generates an image using an image display means such as a specially made small cathode ray tube (CRT) or a liquid crystal display device (hereinafter referred to as LCD), and enlarges the image through an optical lens to enlarge a large screen. As a system of projecting on, such a system is increasing in demand from the advantage of obtaining a large screen that can satisfy the needs of consumers in recent years.

A typical example of the above-described imaging system will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram illustrating a configuration of an optical system of a liquid crystal projector using an LCD in the above-described image projection system.

As shown, of the light emitted from the halogen lamp, which is an example of the light source 1, the blue light B is first reflected by the blue reflective dichroic mirror 2 and passes through the total reflection mirror 5 before the LCD panel 7 Incident).

On the other hand, green light of the remaining red light (R) and green light (G) transmitted from the blue reflective dichroic mirror (2) is reflected by the green reflective dichroic mirror (3) and incident on the LCD panel (8), In addition, the red light transmitted from the green reflective dichroic mirror 3 passes through the total reflection mirror 4.6 and then enters the LCD panel 9.

In this way, each of the red, green, and blue images transmitted according to the screen reproduced by each of the LCD panels 7, 8, 9 are + -shaped dichroic mirror 12 and blue reflective dichroic mirrors 11, 11. '), And the blue and red images are reflected and then merged into the red reflective dichroic mirror 10, and the green images are transmitted and merged with them to form a screen (not shown) through the projection lens 13. Projected enlarged to).

FIG. 2 is an exploded perspective view showing the total reflection mirror mounting structure of the above-described liquid crystal projector optical system, and FIG. 3 is a combined cross-sectional view of FIG.

The housing 20 is not shown in its entirety in the drawings, only a part thereof is shown, and an optical path is formed inside the housing 20 to allow light emitted from the light source 1 to pass therethrough.

The above-described total reflection mirrors 4, 5, 6 (hereinafter, denoted as 4) are provided at appropriate positions of the housing 20.

The housing 20 is provided with a mirror mounting portion 21 so that the entirety of the total reflection mirror 4 can be inserted thereon.

The mirror mounting portion 21 includes a first support wall 211 having an opening 211a so that the reflection surface 4a of the total reflection mirror 4 is exposed, and a mirror insertion groove into which the total reflection mirror 4 is inserted. The second support wall 212 formed at both rear sides of the first support wall 211 so as to form 212a and the end of the second support wall 212 are formed to support the rear surface of the total reflection mirror 4. Consisting of a third support wall 213.

With the total reflection mirror 4 interposed in the mirror insertion groove 212a, the mirror insertion groove 212a between both rear portions of the rear reflection mirror 4 and the third support wall 213 of the mirror mounting portion 21. The pair of sponges 30 spaced apart by a predetermined interval are interposed in a compressed state.

The lower end of the sponge 30 is rounded to be easily inserted into the mirror insertion groove 212a.

Since the sponge 30 is interposed as described above, both front surfaces of the total reflection mirror 4 are in pressure contact with the expansion force of the sponge 30 on the inner surface of the first support wall 212 of the mirror mounting portion 21. Becomes

Hereinafter, the installation procedure of the total reflection mirror according to the prior art will be described.

First, the sponges 30 are attached to both rear sides of the total reflection mirror 4 via double-sided tapes (not shown). Thereafter, the total reflection mirror 4 having the sponge 30 attached thereto is inserted into the mirror insertion groove 212a formed in the mirror mounting portion 21 of the housing 20, but is inserted downward from the top of the housing 20. .

Subsequently, the sponge 30 inserted into the mirror insertion groove 212a of the mirror mounting portion 21 is compressed between both rear sides of the total reflection mirror 4 and the third support wall 213 of the mirror mounting portion 21. On the other hand, both sides of the front surface of the total reflection mirror 4 are formed on the inner surface of the first support wall 211 of the mirror mounting portion 21 by the elastic restoring force by which the compressed sponge 30 is expanded. It will be in a pressure contact state.

However, according to the total reflection mirror mounting structure of the conventional liquid crystal projector optical system configured as described above, in order to install the total reflection mirror 4 to the mirror mounting portion 21 of the housing 20, sponges are provided at both rear sides of the total reflection mirror 4. When attaching (30) via the double-sided tape, there was a problem that its workability is lowered because care should be taken not to get foreign matter on the double-sided tape.

In addition, since the sponge ages or loses its elasticity after a long time, the total reflection mirror cannot be kept in pressure contact with the contact portions of the front sides of the housing, so that the total reflection mirror is formed inside the mirror insertion groove. There was also a problem in that it was tilted, eventually failing to reflect the light back to the LCD panel at the correct angle.

The present invention has been made to solve the above problems, and improves the workability when the total reflection mirror is installed, and the liquid crystal projector optical system is configured so that the total reflection mirror is not tilted inside the mirror insertion groove even after a long time. The purpose is to provide a total reflection mirror installation structure.

1 is a schematic diagram showing a configuration of a general liquid crystal projector optical system.

2 is an exploded perspective view showing a total reflection mirror mounting structure of a liquid crystal projector optical system according to the prior art;

3 is a combined cross-sectional view of FIG. 2.

Figure 4 is an exploded perspective view showing a total reflection mirror installation structure of the liquid crystal projector optical system according to the present invention.

5 is an enlarged view of a leader line “A” of FIG. 4.

Figure 6 is a cross sectional view of the combination of Figure 4;

<Description of Main Parts of Drawing>

4: total reflection mirror 4a: reflective surface

21: mirror mounting portion 40: total reflection mirror support

41: elastic piece 42: space part

43: protrusion 211: first support wall

211a: opening 212: second support wall

212a: mirror insertion groove 213: third support wall

The present invention for achieving the above object, the first support wall having an opening so that the reflective surface of the total reflection mirror is exposed, and formed at both ends of the rear end of the first support wall to form a mirror insertion groove into which the total reflection mirror is inserted. The front surface of the total reflection mirror of the mirror insertion hole of the mirror installation portion formed by connecting the end of the second support wall and the second support wall formed to connect the end of the second support wall to support the rear surface of the total reflection mirror is pressed against the inner surface of the first support wall. In the total reflection mirror mounting structure of the liquid crystal projector optical system installed through the pressing means so as to be in contact, the pressing means includes an elastic piece elastically contacting at least one of the rear surface of the total reflection mirror and the inner surface of the third wall. And a total reflection mirror support inserted into the space of the mirror insertion groove.

Hereinafter, a preferred embodiment of the total reflection mirror mounting structure of the liquid crystal projector optical system according to the present invention will be described in detail with reference to the accompanying drawings.

4 is an exploded perspective view showing a total reflection mirror mounting structure of the liquid crystal projector optical system according to the present invention, FIG. 5 is an enlarged view of a portion “A” of FIG. 4, and FIG. 6 is a cross sectional view of FIG. 4.

The total reflection mirror mounting portion 21 according to the present invention has a first support wall 211 having an opening 211a and a total reflection mirror 4 so that the reflective surface 4a of the total reflection mirror 4 is exposed as in the related art. The second support wall 212 formed at both rear sides of the first support wall 211 so as to form the mirror insertion groove 212a into which the second insertion wall is inserted, and the second support wall 212 so as to support the rear surface of the total reflection mirror 4. It consists of a third support wall 213 formed by connecting the ends of the).

The width W of the mirror insertion groove 212a, which is the distance between the first support wall 211 and the third support wall 213, is formed to be larger than the thickness t of the total reflection mirror 4.

That is, the width W ′ of the remaining mirror insertion groove 212a after the total reflection mirror 4 is inserted is equal to the total reflection mirror at the width W of the mirror insertion groove 212a in which the total reflection mirror 4 is not inserted. The thickness t of 4) may be excluded.

The mirror insertion groove 212a excluding the thickness of the total reflection mirror 4 is provided with pressing means for causing the front surface of the total reflection mirror 4 to be in pressure contact with the inner surface of the first support wall 211.

The pressing means has an elastic piece 41 which is in elastic contact with at least one of the rear surface of the total reflection mirror 4 and the inner surface of the third support wall 213 to reduce the thickness t of the total reflection mirror 4. It consists of a total reflection mirror support 40 is inserted into the mirror insertion groove 212a.

The total reflection mirror support 40 is formed with a space portion 42 of the recess of a predetermined depth so that the elastic piece 31 can be flexed elastically.

Here, the lower end of the total reflection mirror support 40 is rounded to be easily inserted into the mirror insertion groove 212a.

Moreover, the protrusion part 43 is formed in the outer edge part of the elastic piece 41. As shown in FIG.

Here, it is preferable that a plurality of elastic pieces 41 are formed on the total reflection mirror support 40 corresponding to both sides of the rear surface of the total reflection mirror 4 in the vertical direction.

The reason is that the elastic support force of the elastic piece 41 is transmitted to both sides of the rear side of the total reflection mirror 4 on both sides of the front surface of the total reflection mirror support 40, and eventually the front surface of the total reflection mirror 4 is mirror-mounted portion 21. This is because it is an optimal point to press-contact the inner surface of the first support wall 211 of the C1) so that the total reflection mirror 4 does not flow.

Referring to the installation procedure of the total reflection mirror according to the present invention configured as described above are as follows.

First, the total reflection mirror 4 is inserted into the mirror insertion groove 212a formed in the mirror installation portion 21, but is inserted downward from the top of the mirror insertion groove 212a.

Thereafter, the total reflection mirror support 40 is inserted into the mirror insertion groove 212a except for the total reflection mirror 4.

During the insertion process of the total reflection mirror support 40, the projections 43 protruding at the end of the elastic piece 41 is in contact with the rear surface of the total reflection mirror 4, so that the elastic piece 41 of the groove It is elastically bent into the space 42.

Subsequently, when the insertion process of the total reflection mirror support 40 is completed, the elastic piece 41 continuously maintains the elastically bent state in the space 42 of the recess, but the elastic piece 41 to be restored to its original state. By virtue of its own properties, both front surfaces of the total reflection mirror 4 are continuously maintained in pressure contact with the inner surface of the first support wall 211 of the mirror mounting portion 21.

Therefore, even after a long time in which the total reflection mirror is installed as described above, both front surfaces of the total reflection mirror are always kept in pressure contact with the inner surface of the first support wall of the mirror mounting portion, which is the inside of the mirror insertion groove. By acting as a factor to prevent tilting, it becomes possible to smoothly perform the reflection mirror dynamics of reflecting light to the LCD panel at the correct angle.

As described above, according to the present invention, the installation work can be simplified when the total reflection mirror is installed, and workability can be improved, and the total reflection mirror is not tilted inside the mirror insertion groove even when the mirror is installed for a long time. .

Claims (2)

A first support wall having an opening to expose the reflection surface of the total reflection mirror, a second support wall formed at both rear sides of the first support wall to form a mirror insertion groove into which the total reflection mirror is inserted, and the total reflection mirror Pressing means for inserting the mirror of the mirror mounting portion consisting of a third support wall formed by connecting the end of the second support wall to support the rear surface of the pressure mirror so that the front surface of the total reflection mirror is in pressure contact with the inner surface of the first support wall. In the total reflection mirror installation structure of the liquid crystal projector optical system interposed therebetween, The pressing means comprises a total reflection mirror support having an elastic piece in elastic contact with at least one of a rear surface of the total reflection mirror and an inner surface of the third wall and inserted into a space of the mirror insertion groove. Total reflection mirror installation structure of liquid crystal projector optical system. The method of claim 1, wherein the total reflection mirror support is formed with a space of a predetermined depth, the elastic reflection is formed on the total reflection mirror support to bend into the interior of the space portion, characterized in that the projection is formed on the outer end of the elastic piece. Total reflection mirror mounting structure of the liquid crystal projector optical system.