JP3430274B2 - Optical component fixing mechanism - Google Patents

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 optical parts, and more particularly to a fixing mechanism for each optical part in a device such as a liquid crystal display device which uses a large number of optical parts inside. is there.

[0002]

2. Description of the Related Art In recent years, the progress of liquid crystal display technology has been remarkably advanced, and with the advent of liquid crystal panels having excellent contrast and color reproducibility, a color liquid crystal panel that uses a color liquid crystal panel as an image display unit and magnifies and projects on a large screen. Projectors have been put to practical use. This type of device focuses light from a light source into substantially parallel rays with a converging optical system, irradiates a transmissive color liquid crystal panel, and magnifies and projects the transmitted light onto a screen through a projection optical system. Therefore, many plate-shaped optical components such as a liquid crystal cell, a cover glass, a transparent glass, and a mirror are used inside.

As shown in FIG. 3, such an optical component 30 is usually screwed and fixed while being sandwiched between an optical base bracket 31 and a pair of rod-shaped brackets 32 for fixing both side portions. Is configured.

The outer shape of the optical base bracket 31 is formed to be approximately the same size as the optical component 30, and a window 33 having a size corresponding to the display surface 30a of the optical component 30 is formed in the central portion. The window 33 is transparently provided, and at the position corresponding to the frame 34 of the window 33, screw holes 3 are provided at the four corners.
5 is transparently installed.

In the width direction of the pair of brackets 32 for fixing the both side portions of the optical component 30, the side portions of the optical component 30 are in contact with each other, and the gap portion 3 having a thickness substantially corresponding to the plate thickness of the optical component 30 is formed.
6 is formed in a swollen state, and screw holes 37 facing the screw holes 35 of the optical base bracket 31 are transparently provided at both ends in the length direction.

With such a structure, the optical component 30
When assembling, the optical base bracket 31 is positioned and placed on the upper surface of the optical base bracket 31 so that the display surface 30a of the optical component 30 faces the window 33, and then the pair of brackets 32 is mounted.
The bracket 32 is positioned so that both sides of the optical component 30 come into contact with the gap portion 36 of the optical component 30, and the screw 38 is screwed into the screw holes 37 and 35 through the washer 39.
0 is positioned and fixed while being sandwiched between the optical base bracket 31 and the bracket 32.

[0007]

The optical component 30 mounted on the optical base bracket 31 is simply pressed by the clearance between the plate thickness of the optical component 30 and the gap portion 36 of the bracket 32. If the gap portion 36 is wider than the plate thickness of the optical component 30, even if the bracket 32 and the optical base bracket 31 are screwed to each other with the screw 38, the optical component 30 rattles and is accurately positioned and fixed. There was a problem that I could not do it.

On the other hand, if the gap 36 is too narrower than the plate thickness of the optical component 30, the optical component 30 may be damaged when the optical component 30 is screwed and fixed.
There is a problem in that careful attention is required for the assembling, the assembling time is accordingly long, and the burden on the operator is also increased. Further, sometimes special tools such as a torque driver are required, which is one of the causes of cost increase.

Further, there has been a strong demand at the precision assembly site to reduce the number of parts as much as possible, and also to avoid using ordinary tools or special tools.

[0010]

SUMMARY OF THE INVENTION The present invention has a plate-like optical component and a size substantially equal to the optical component.
A window having a shape facing the display surface of the optical component is provided through, and a pair of locking holes facing each other is provided through on both sides of the window frame. Along the side line of the base, the base bracket is bent downward at a right angle to the vertical surface to form a positioning side, and both sides of the optical component are formed by elastic members and both sides of the window frame and the base. A pressing piece that is held and pressed by the bracket, an upper bending piece that extends from both ends of the pressing piece and bends upward with respect to a vertical surface, and a downward bending that follows the upper bending piece and a downward direction. It is formed into a substantially V shape with the bent piece, and the optical component is a base.
A clip composed of a movable piece for elastically positioning and fixing to the base bracket, and the optical part is positioned by inscribed in the central portion of the pressing piece of the clip in a plane perpendicular to the positioning side of the base bracket. The movable bracket has a fixed contact piece, and the lower bent piece of the movable piece is provided with a pair of clips formed with claws that engage with the peripheral edge of the locking hole of the base bracket. Place the optical component on the frame and insert the lower bent piece of the movable piece of the clip into the locking hole of the window frame from the upper surfaces of both sides of the optical element to engage with the claw to attach the optical component. -The bracket is positioned and fixed by a bracket and a clip.

[0011]

The optical component 30 mounted on the base bracket 1
When the lower bent pieces 8b of the clip 6 are inserted into the locking holes 5 from the upper surfaces of the both sides of the claws 9, the claws 9 are locked to the peripheral edges of the locking holes 5, so that the pressing pieces 7 are positioned on both sides of the optical component 30. The fixed contact piece 7a is inscribed in the positioning side 4 of the base bracket 1 by pressing. Therefore, the optical component 30 is sandwiched between the base bracket 1 and the clip 6 and positioned and fixed.

[0012]

Embodiments of the present invention will be described in detail with reference to FIGS. 1 is an exploded perspective view showing an embodiment of the present invention, and FIG. 2 is a clip 6 for fixing an optical component 30.
FIG. The same parts as those of the conventional example are given the same names and the description thereof is omitted.

In FIG. 1, 1 is a base bracket,
A plane portion on which the optical component 30 is placed is formed to be approximately the same size as the optical component 30, and a window 2 having a shape facing the display surface 30a of the optical component 30 is provided therethrough. The window frame 3 is formed. Positioning sides 4 which are bent at right angles downward (Z-axis direction) with respect to the vertical surface are formed along the lateral lines of the window 2 on either side of either one of the window frames 3. The positioning side 4 is for positioning the optical component 30 in the Y-axis direction, and the interval T (length in the Y-axis direction) between the positioning sides 4 on both sides is formed so as to coincide with both side lines of the optical component 30. And serves as a reference for positioning the optical component 30 in the Y-axis direction.

On both sides of the window frame 3 of the base bracket 1, a pair of locking holes 5 are provided so as to face each other, and a distance D between the pair of locking holes 5 is an optical component. Three
0 is the same as the length of the optical axis 30 in the X-axis direction.
It serves as a reference for axial positioning.

As shown in FIGS. 1 and 2, 6 is a clip, which is made of an elastic material such as carbon steel, alloy steel, stainless steel, brass, bronze, phosphor bronze, aluminum alloy,
It is for pressing both sides of the optical component 30 to the base bracket 1 and fixing them, and is formed in a band shape as a whole, and a pair is formed.

The clip 6 holds pressing both side portions of the optical component 30 between both side portions of the window frame 3 and the base bracket 1 and presses the pressing piece 7 from both end portions of the pressing piece 7, respectively. An upper bent piece 8a that extends and bends upward with respect to the vertical surface (Z-axis direction) is formed, and then the upper bent piece 8a.
a and a movable piece 8 for elastically positioning and fixing the optical component 30 to the base bracket 1 by being formed in a substantially V shape by a downward bent piece 8b bent downward.

A fixed contact piece 7a is formed in the central portion of the pressing piece 7, and the fixed contact piece 7a is positioned along the side line (X-axis direction) of the optical component 30 and the positioning side of the base bracket 1. The optical component 30 is positioned and fixed in the Y-axis direction by being inscribed in the plane perpendicular to the surface 4 (Z-axis direction). In this embodiment, a pair of notches 10 are formed in the central portion of the pressing piece 7, and the portions between the notches 10 are cut and raised downward (Z-axis direction) at right angles.

The fixed contact piece 7a may have any length (in the X-axis direction). At least the pair of fixed contact sides 7a facing each other is a base while holding the side line of the optical component 30.
It suffices if the length is such that the optical component 30 can be positioned and fixed by being inscribed in the positioning side 4 of the bracket 1.

Further, the fixed tangential edge 7a is, as in this embodiment,
It may be formed integrally with the pressing piece 7. Alternatively, the elongated fixed contact piece 7a may be formed as a separate component, and the elongated fixed contact piece 7a may be adhered to a predetermined portion of the pressing piece 7 to be formed. The width of the fixed contact piece 7a in the vertical direction (Z-axis direction) is formed to be shorter than the width of the positioning side 4 of the base bracket 1.

The lower bent pieces 8b of the pair of movable pieces 8 are formed with claws 9 that engage with the locking holes 5 of the window frame 3 in a state of opening in opposite directions. Therefore, when the clip 6 and the base bracket 1 are engaged, the movable piece 8
The lower bent piece 8b is inserted into the locking hole 5 and the claw 9 is locked to the peripheral edge of the locking hole 5, so that the clip does not fall out of the base bracket 1.

Further, (length of pressing piece 7) + (length of upper bent piece 8a extending at both ends of pressing piece 7) = (interval D between a pair of locking holes 5) When the length of the side line of the component 30 (X-axis direction) is equal to this distance D, the optical component 30 is accurately positioned and fixed by the base bracket 1 and the clip 6.

In this embodiment, the movable piece 8 of the clip 6 is integrally formed with the pressing piece 7 by bending both end portions of the pressing piece 7 upward and then bending downward to form a substantially V shape. The claw 9 is formed by cutting and raising, but not limited to this, the movable piece 8 is formed as a separate part and is fixed to both ends of the pressing piece 7. Good.

Next, the assembling method will be described. When the display surface 30a of the optical component 30 is placed on the upper surface of the base bracket 1 so as to face the window 2, the peripheral portion of the optical component 30 is placed on the window frame 3. Next, the clips 6 are attached to the base bracket 1 from the upper surfaces of both sides of the optical component 30, respectively. In this case, the lower bent pieces 8b of the pair of movable pieces 8 are held in the locking holes 5 while being held by fingers. When each is inserted, the claw 9 is locked to the peripheral edge of the locking hole 5, and the pressing piece 7 presses both sides of the optical component 30,
The fixed contact piece 7 a is inscribed in the positioning side 4 of the base bracket 1. Therefore, the optical component 30 is sandwiched between the base bracket 1 and the clip 6 and positioned and fixed.

[0024]

According to the present invention, a plate-like optical component and a window having a size substantially equal to that of the optical component and having a shape facing the display surface of the optical component are provided through the both sides of the window frame. A pair of locking holes facing each other are provided through the
A base bracket formed by bending one of both sides of the window frame along the lateral line of the window at a right angle downward with respect to a vertical plane to form a positioning side, and an elastic member formed on both sides of the optical component. A pressing piece that holds the part on both sides of the window frame and the base bracket and presses it, and an upward bending piece that extends from both ends of the pressing piece and bends upward with respect to a vertical plane. A clip which is formed in a substantially V shape by an upper bent piece and a lower bent piece that bends downward, and a movable piece for elastically positioning and fixing an optical component to a base bracket. At the center of the pressing piece of the clip, there is a fixed contact piece that contacts the positioning side of the base bracket in a vertical plane and positions and fixes the optical component. The lower bent piece of the movable piece has a base bracket. Forming a claw that engages with the peripheral edge of the locking hole of And a pair of clips, and the optical parts are placed on the window frame of the base bracket, and the downward bent pieces of the movable pieces of the clips are inserted into the locking holes of the window frame from the upper surfaces of both sides of the optical parts. Since the optical parts are inserted and engaged with the claws to position and fix the optical parts by the base bracket and the clip, the positioning and fixing of the optical parts can be performed with one touch, so that the assembly process is simplified.

Moreover, unlike the conventional case, it is not necessary to screw the assembly site. Therefore, it does not require a special skill for assembling and can be easily assembled. There is no need to use parts such as screws or assembly parts such as a driver, and no special tools. The elastic force of the clip always gives a fixed fixing force to the optical parts, and the optical parts can be fixed securely without fear of breakage or decomposition.

Since the fixed contact piece provided on the pressing piece of the clip is formed by cutting and raising from the pressing piece, the base bracket can be easily manufactured.

Further, in the movable piece of the clip, both ends of the pressing piece are bent upward, and then bent downward to be formed into a substantially V shape so as to be integrally formed with the pressing piece, and the claw is lowered. Since it is formed by cutting and bending from a bent piece, the clip can be manufactured easily and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a clip 6.

FIG. 3 is a perspective view showing a conventional example.

[Explanation of symbols]

1 base bracket 2 windows 3 window frames 4 Positioning side 5 locking holes 6 clips 7 pressing piece 7a Fixed contact piece 8 movable pieces 8a Upper bent piece 8b Lower bent piece 9 nails 30 optical components

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Claims (3)

(57) [Claims] 1. A plate-shaped optical component and a window having a size substantially equal to that of the optical component and having a shape facing the display surface of the optical component are provided so as to penetrate each other on both sides of the window frame. A base having a pair of locking holes opposed to each other and having both sides of one of the window frames bent downward at right angles to a vertical surface along the side line of the window to form a positioning side. A pressing piece formed of a bracket and an elastic member for holding both side portions of the optical component by the both side portions of the window frame and the base bracket and extending from both end portions of the pressing piece. Is formed into a substantially V shape by an upper bent piece bent upward with respect to a vertical plane and a lower bent piece bent downwardly following the upper bent piece, and the optical component is formed into the base.
A clip composed of a movable piece for elastically positioning and fixing to the base bracket, wherein the central portion of the pressing piece of the clip is inscribed in a plane perpendicular to the positioning side of the base bracket. The movable piece has a fixed contact piece for positioning and fixing the optical component, and the lower bent piece of the movable piece is provided with a pair of the clips formed with claws that engage with the peripheral edge portion of the locking hole of the base bracket. The optical component is placed on the window frame of the base bracket, and the lower bent pieces of the movable piece of the clip are inserted into the locking holes of the window frame from the upper surfaces of both sides of the optical component. A fixing mechanism for an optical component, characterized in that the optical component is inserted and engaged with the claw, and the optical component is positioned and fixed by a base bracket and a clip. 2. The fixing mechanism for an optical component according to claim 1, wherein the fixing contact piece provided on the pressing piece of the clip is formed by cutting and raising from the pressing piece. 3. A movable piece of the clip is formed by bending both end portions of the pressing piece in an upward direction and then bending in a downward direction to substantially V
3. The fixing mechanism for an optical component according to claim 1, wherein the claw is formed in a shape and formed integrally with the pressing piece, and the claw is cut and raised from a downward bent piece. .