JPH10312161A - Fixing mechanism for optical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fixing work of optical member without loading eccentric pressure to the optical member by fixing the optical member by inserting a locking member into lock holes on a base bracket, for which the lock hole is opened on a positioning member, and the positioning member. SOLUTION: At a prescribed position on a base bracket 1, a window 2 is arranged and on the side to install an optical member 10, a positioning side 3, positioning piece 4 and projection 5 or the like are respectively arranged. On the positioning piece 4, a lock hole and a lock pawl are respectively provided and a clip 6 is inserted and fixed. The projection 5 is formed while being semispherically projected on the surface of base bracket 1 facing the optical member 10, and the apex part of projection 5 is abutted to the mirror surface of optical member 10 and holds the optical member 10 together with the clip 6. Thus, since the terminal part of the sheet metal of base bracket 1 is not directly abutted to the optical member 10, it is effective for the protection and accuracy maintenance of optical member 10, fixing work is facilitated and a main body is made light in weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing mechanism for an optical member, and more particularly to a fixing mechanism for a flat optical member in a device using a large number of optical members inside, such as a liquid crystal display device. It is.

[0002]

2. Description of the Related Art In recent years, the progress of liquid crystal display technology has been remarkable, and with the advent of liquid crystal panels having excellent contrast and color reproducibility, a liquid crystal color display device that uses a color liquid crystal panel as a single image display and enlarges and projects onto a large screen has become practical. Has been This type of device converges light from a light source into substantially parallel light beams using a converging optical system, irradiates the light to a transmission type color liquid crystal panel, and enlarges and transmits the transmitted light onto a screen via a projection optical system. Inside, many plate-like optical members such as a liquid crystal cell, a cover glass, a transparent glass, and a mirror are used.

FIG. 4 shows a conventional example of such a plate-like optical member mounting mechanism. A pair of positioning sides 13 facing the periphery of the display window 12 and a T-shaped positioning piece 14 are formed in the base 11 made of sheet metal by cutting the base 11 (FIG. 4A). The optical member 10 is specifically an optical mirror, and is used by being fixed to a mirror surface facing the display window 12 side.

As the fixing operation, first, the T-shaped positioning pieces 14 are turned upside down to face each other.
It is bent forward and functions as a so-called positioning side that surrounds four sides of the fixed position where the optical member 10 is fixed together with the positioning side 13. Next, the optical member 10 is placed with the mirror surface facing the display window with respect to the fixed position. Lastly, both wings 15 of the positioning piece 14 are fixed for fixing the optical member 10.
90 degrees. That is, by bending each portion of the positioning piece 14 that is not connected to the base 11 toward the optical member 10, the ends of the two wings 15 of the positioning piece 14 abut on the back surface of the optical member 10, while finely adjusting the contact strength. The optical member 10 is fixed (FIG. 4B).

[0005]

In the fixing mechanism having such a structure, since the optical member 10 and the positioning piece 14, that is, the optical member as a mirror and the sheet metal portion are in direct contact with each other at the end even though the back surface, this fixing mechanism is used. Since the impact received by the equipment itself having the is transmitted directly to the optical member 10 through the end of the positioning piece 14 directly through the base 11, the influence such as cracking or breakage easily occurs on the mirror surface on the front side of the optical member 10, This was the cause of the malfunction. Further, the positioning piece 14
Are cut surfaces of the metal plate, and the installation area on the optical member was small.

Further, not only direct damage such as cracking or breakage, but also a certain strength is required for fixing the optical member. However, the mirror surface of the optical member 10 itself depends on the degree of bending of the positioning piece 14 for that purpose. Pressure is applied, the mirror surface itself is distorted, and this mechanism placed on the optical path of the main body can only achieve insufficient reflection, which may be an obstacle to image formation.

Further, in recent years, weight reduction of the electronic device main body has been an urgent problem, and it has been necessary to make the base 11 lighter without lowering the precision.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and does not apply an uneven pressure to an optical member.
An object of the present invention is to provide an optical member fixing mechanism for simplifying an optical member fixing operation.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plate-shaped optical member and a window having a shape facing a display surface of the optical member. By providing a positioning member that stands upright along the side of the optical member at a fixed position, a base bracket having a locking hole formed in the positioning member, and a locking member inserted into the locking hole of the positioning member, The optical member is fixed, and is realized by an optical member fixing mechanism.

The locking member is formed of an elastic metal plate, and includes a pressing piece that contacts the optical member and a locking piece that is engaged by a locking claw provided near the locking hole. This is realized by an optical member fixing mechanism, which is a clip made of

[0011] It is preferable that a base bracket having a hemispherical projection provided at the same position as the pressing piece of the clip abutting on the optical member and fixing the optical member by clamping the pressing piece is used. This is realized by a characteristic optical member fixing mechanism.

The base bracket used for the fixing mechanism is realized by an optical member fixing mechanism, which is made of resin.

[0013]

According to the present invention, since the end of the sheet metal of the base bracket does not directly contact the optical member, it is useful for protecting the optical member and maintaining the accuracy, and also simplifies the fixing work.
Reduce the body weight.

[0014]

FIG. 1 is a process perspective view showing an embodiment of the present invention. FIG. 2 is an enlarged perspective view of a main part of one embodiment of the present invention. FIG. 3 is also an enlarged side sectional view of a main part of one embodiment of the present invention. First, unlike the conventional example, the base bracket 1 has a complicated structure in the vicinity of the positioning piece 4, is difficult to be formed by sheet metal, and is made of resin in this embodiment in order to reduce the weight of the main body. The type of resin used is a polycarbonate resin, and there is no problem in strength at all.

A window 2 is provided at a predetermined position of the base bracket 1.
However, the positioning side 3,
The positioning piece 4, the projection 5, and the like are arranged.
The positioning side 3 is erected so as to be in contact with the side of the optical member 10 as in the related art.

The positioning piece 4 is brought into contact with the remaining side of the positioning side 3 which is in contact. In this embodiment, the positioning pieces 4 are provided at two locations on each side, that is, a total of four locations. Further, as shown in FIG.
a and a locking claw 4b are provided, and a clip 6 described later is inserted.
Fixed.

The projection 5 is provided on the optical member 1 of the base bracket 1.
The positioning piece 4 is formed so as to bulge in a hemispherical shape on the surface opposing the positioning piece 4 (the window 2 side). The apex portion of the hemispherical projection 5 abuts on the mirror surface (surface) of the optical member 10, and holds the optical member 10 together with the clip 6.

The clip 6 is a so-called stopper. In this embodiment, a thin metal plate (thin strip) is formed by bending. The clips 6 are prepared by the number of the locking holes 4a of the positioning pieces 4, and after the optical member 10 is placed at a predetermined position, the clips 6 are pushed into the locking holes 4a from outside. As shown in detail in FIG. 3, the clip 6 is brought into contact with the optical member 10 by a pressing piece 6 a paired with the projection 5 and holding the optical member 10, and a locking claw 4 b provided on the positioning piece 4. The clip 6 itself includes a locking piece 6b for preventing the clip 6 from dropping out of the locking hole 4a.

The optical member 10 is a mirror made of a glass plate, and is installed with the mirror surface facing the base bracket 1.
The light that has passed through the window 2 of the base bracket 1 is reflected, and the reflected light is reflected again on the optical system (not shown) through the window 2.

Next, the work of installing the optical member 10 will be described in detail. FIG. 1A shows an arrangement of each member on the base bracket 1 without the optical member 10 on the base bracket 1. In this embodiment, four positioning pieces 4 are arranged on each side, two on each side, which are the upper side and the lower side of the optical member 10. This is a necessary and sufficient minimum arrangement for fixing the optical member 10 having a side of about 200 mm, but it goes without saying that the number is increased for larger equipment. In addition, the operator does not touch the mirror surface near the center of the upper side and the lower side of the optical member 10, or
Since it is usual to handle the optical member 10 while holding both ends, the positioning piece 4 is not arranged at that position.

First, the optical member 10 is placed on the base bracket 1 as in the conventional example. FIG. 1B shows a state where the optical member 10 is mounted on the base bracket 1. Since each positioning side 3 and each positioning piece 4 are located at positions where they come into contact with each side of the optical member 10, the optical member 10 is positioned at a position required for the window 2. However, specifically, unlike the related art, the optical member 1 is directly provided on the base bracket 1.
Since 0 does not abut, but abuts on the apex of each projection 5, a gap corresponding to the height of the projection 5 is slightly opened between the base bracket 1 and the optical member 10.

Finally, the clip 6 is inserted into the locking hole 4a of each positioning piece 4 (FIG. 3). In the present embodiment, the order of insertion is not determined, and any clip 6 may be inserted. That is, since the pressing piece 6a of the clip 6 is a thin metal plate having elasticity as described above, the optical member 10 is appropriately pressed by the elastic force even when inserted from any clip, so that the optical member 10 may not be distorted. Absent. The contact portion of the pressing piece 6a of the clip 6 with the optical member 10 forms a pair with the apex of the projection 5, and holds the optical member 10 (FIG. 4). Also, as the clip 6 is inserted, the locking portion 6b also bends while expanding along the inclination of the positioning claw 4b, and when the insertion is completed, the positioning claw 4b fits into the center portion of the locking portion 6b to prevent the clip 6 from dropping off. I do.

[0023]

As described above in detail, according to the fixing mechanism according to the present invention, according to the fixing mechanism of the present invention, the positioning member of the base bracket having the positioning member is provided so that the optical member can be fixed at a predetermined position of the base bracket. Since the locking member can be inserted by providing a locking hole, the operation can be simplified, and the level of mounting accuracy can be improved and generalized regardless of the skill level of the operator.

Further, according to the fixing mechanism of the present invention, the locking member is made of an elastic metal plate, and the projection which is paired with the locking member and holds the optical member is made of resin. There is no possibility that a biased pressure is applied to the optical member, and the elastic force of the locking member absorbs the vibration applied to the main body, so that the vibration is not directly transmitted to the optical member and the optical member can be prevented from being damaged.

Further, according to the fixing mechanism of the present invention,
Since the base bracket for fixing the optical member is made of resin, the body can be reduced in weight and can be easily carried.

[Brief description of the drawings]

FIG. 1 is a process perspective view showing one embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of one embodiment of the present invention.

FIG. 3 is an enlarged side sectional view of a main part of one embodiment of the present invention.

FIG. 4 is a process perspective view of a conventional fixing mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base bracket 2 Window 3 Positioning side 4 Positioning piece 5 Projection 6 Clip 10 Optical member

Claims (4)

[Claims] 1. A plate-shaped optical member, and a positioning member which penetrates a window having a shape facing a display surface of the optical member and which stands upright along a side of the optical member at a fixed position of the optical member. And a base bracket having a locking hole formed in the positioning member; and an optical member fixed by inserting the locking member into the locking hole of the positioning member. A mechanism for fixing members. 2. The pressing member according to claim 1, wherein the locking member is formed of a metal plate having elasticity.
2. The optical member fixing mechanism according to claim 1, wherein the clip comprises a locking piece engaged with a locking claw provided near the locking hole. 3. 3. A base bracket having a hemispherical projection provided at the same position as the pressing piece of the clip abutting on the optical member and fixing the optical member by clamping the pressing piece. The optical member fixing mechanism according to claim 1 or 2, wherein: 4. The optical member fixing mechanism according to claim 1, wherein the base bracket is made of resin.