JP2843720B2 - LCD module position adjustment mechanism for LCD projector - Google Patents

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 and, more particularly, to a liquid crystal module position adjusting mechanism for matching each screen of an RGB liquid crystal module and matching each liquid crystal module with a back focus position of a projection lens. .

[0002]

2. Description of the Related Art FIG. 5 shows an example of the structure of a liquid crystal projector. As shown in the figure, light emitted from a light source a is reflected by a mirror b, passes through a filter c, and enters a dichroic mirror d. The red light is reflected by the dichroic mirror d, and the green light and the blue light pass through the dichroic mirror d. The red light reflected by the dichroic mirror d is reflected by the mirror e, passes through the condenser lens f and the polarizing plate g, and the passing position is controlled by the red image information by the red liquid crystal module h. The light passes through and enters the projection lens k.

The green light and the blue light that have passed through the dichroic mirror d enter the dichroic mirror I. The blue light is reflected by the dichroic mirror l, and the green light passes through the dichroic mirror l. After the blue light reflected by the dichroic mirror 1 passes through the condenser lens f and the polarizing plate g, the passing position is controlled by the blue image information in the blue liquid crystal module m, reflected by the dichroic mirror i, and passed through the dichroic mirror j. Then, the light is incident on the projection lens k.

The green light that has passed through the dichroic mirror 1 passes through a condenser lens f and a polarizing plate g,
The passing position is controlled by the green liquid crystal module n based on the green-blue image information, reflected by the mirror o, further reflected by the dichroic mirror j, and incident on the projection lens k.

[0005] As described above, the light flux having each of the red, blue and green image information incident on the projection lens k is projected by the projection lens k so as to form an image on the same screen. Accordingly, each of the red, blue and green liquid crystal modules is disposed at the back focus position of the projection lens k, the optical path length from the projection lens k of each liquid crystal module is equal, and the images correspond to the X-axis and Y-axis directions. Points must overlap. For this purpose, the positions of the other two liquid crystal modules in the optical axis direction, the X axis direction, and the Y axis direction are adjusted with respect to the reference liquid crystal module.

FIG. 6 shows an example of such a conventional liquid crystal module position adjusting mechanism. 1 shown in the figure is a base plate,
The condenser lens support plate 2 and the left side plate 1b are integrally mounted. A condenser lens is mounted on the condenser lens support plate 2. The condenser lens support plate 2 is mounted to be inclined with respect to the base plate 1 so that the condenser lens is inclined by about 6 ° with respect to the liquid crystal module.

A bent portion is provided on the right side of the base plate 1, and an eccentric screw 3 is screwed into the bent portion. The head of the eccentric screw 3 is engaged with a long hole provided in the right frame, and by turning the eccentric screw 3, the position of the right side of the base plate 1 in the optical axis direction is adjusted. After the adjustment, the screw is screwed into the right bent portion of the base plate 1 through the elongated hole of the right frame on the left and right of the eccentric screw 3 and is fixed to the adjustment position.

An eccentric screw 3 is screwed into the left frame through a long hole provided in the left plate 1b spot-welded to the left of the base plate 1. By turning the eccentric screw 3, the position on the left side of the base plate 1 in the optical axis direction is adjusted. After adjustment,
The eccentric screw 3 is fixed to the adjustment position by a screw that is screwed into the left frame through the long hole of the left plate 1b on the left and right sides.

Screws 6 and 6 are screwed on the left and right sides of the X-axis adjusting plate 5, and the collars 6 a and 6 a through which the screws 6 and 6 are inserted engage the elongated holes 1 a and 1 a of the base plate 1 in the X-axis direction. doing. The collars 6b, 6b into which the screws 6, 6 are inserted are engaged with the elongated holes 4a, 4a in the Y-axis direction of the Y-axis adjustment plate 4. Thus, the X-axis adjustment plate 5 is supported movably in the X-axis direction with respect to the base plate 1, and the Y-axis adjustment plate 4 is supported movably in the Y-axis direction with respect to the X-axis adjustment plate 5.

The screw rod 7 whose axial position is regulated by the bent portion of the X-axis adjusting plate 5 is screwed with the right bent portion of the base plate 1. 5 is adjusted in the X-axis direction. After the adjustment, the X-axis adjustment plate 5 is screwed into the base plate 1 through a long hole of the X-axis adjustment plate 5.
Is fixed to the base plate 1.

A link 8 is rotatably supported on a shaft 5a erected on the X-axis adjustment plate 5. A screw rod 10 is screwed into a pin 9 fitted to the link 8, and the screw rod 10 is connected to the X-axis adjustment plate 5.
The position in the axial direction is restricted by the L-shaped bracket 5b spot-welded. By turning the screw rod 10, the link 8 rotates, and the position of the Y-axis adjustment plate 4 on the right side in the Y-axis direction is adjusted via the pins 8 a provided upright on the link 8. Similarly, the Y-axis direction position on the left side of the Y-axis adjustment plate 4 is adjusted by turning the screw rod 10a. After the adjustment, the Y-axis adjustment plate 4 is screwed into the Y-axis adjustment plate 5 through a long hole of the Y-axis adjustment plate 4.
Is fixed to the X-axis adjustment plate 5.

The polarizing plates are fastened to the pins 11a, 11a,... Provided on the surface of the liquid crystal module fixing plate 11, and the pins 11b, 11b,
The liquid crystal modules are fastened to 11b. Such a liquid crystal module fixing plate 11 is positioned on pins 4c, 4c and 4d, 4d erected on the Y-axis adjustment plate 4 and fastened to the Y-axis adjustment plate 4 with screws. That is, the liquid crystal module is fixed to the Y-axis adjustment plate 4 and the Y-axis adjustment plate 4
Is adjusted in the Y-axis direction with respect to the X-axis adjustment plate 5, the X-axis adjustment plate 5 is adjusted in the X-axis position with respect to the base plate 1, and the base plate 1 is adjusted in the optical axis position with respect to the frame. Adjusted. In this way, the position of the liquid crystal module in the optical axis direction, the position in the X axis direction, and the position in the Y axis direction are independently adjusted.

[0013]

In the prior art described above, when the position in the optical axis direction is adjusted, right and left are separately adjusted. At that time, the other end is fastened to the frame. There is a drawback that a stress is generated in the base plate, and the position is changed by the stress after the adjustment, so that fine adjustment is difficult.

In addition, since the adjustment is made separately with left and right eccentric screws or links, the relationship between the amount of rotation and the amount of displacement at the current position is unclear, and it is difficult to reproduce the initial position. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to adjust the position of a liquid crystal module of a liquid crystal projector in which the relationship between an initial position and a current position is clear and adjustment is easy. It is to provide a mechanism.

[0016]

A liquid crystal module position adjusting mechanism for a liquid crystal projector according to the present invention supports a base plate to which a condenser lens is fixed so as to be movable in the optical axis direction on a frame, and a wedge-shaped member is interposed on the base plate. Then, the X-axis adjustment plate mounting base plate is fastened, and the X-axis adjustment plate is supported on the X-axis adjustment plate mounting base plate so as to be movable in the X-axis direction, which is one axis of the liquid crystal module, and the X-axis adjustment plate X by the rotation of the cam lever rotatably supported on the mounting base plate
The position in the axial direction can be adjusted, and the rotation angle of the cam lever can be adjusted by adjusting screws supported in the Y-axis direction perpendicular to the X-axis and the optical axis on the X-axis adjusting plate mounting base plate. The X-axis adjustment plate is supported so as to be movable in the Y-axis direction, and the adjustment screw is supported on the X-axis adjustment plate in the Y-axis direction.
The axial position can be adjusted, and the liquid crystal module fixing plate to which the liquid crystal module and the polarizing plate are tightened
The rotation angle is adjustable by an adjustment screw supported in a Y-axis direction on a Y-axis adjustment plate while being supported rotatably in the Y-plane.

In the liquid crystal module position adjusting mechanism of the liquid crystal projector, a pinion fixed to an adjusting shaft rotatably supported in the Y-axis direction on the base plate is engaged with a rack fixed to a frame. By rotating the shaft, the position of the base plate in the optical axis direction is adjusted.

[0018]

According to the liquid crystal module position adjusting mechanism of the liquid crystal projector of the present invention, the base plate is supported by the frame so as to be freely movable in the optical axis direction. Adjustment is easy.

When a rack and a pinion are used as the fine adjustment mechanism, the initial position is clarified by marking a specific position on the rack and the pinion.
The relationship between the rotation amount and the movement amount of the pinion is always constant.

Further, not only the X-axis direction and the Y-axis direction but also XY
Since the rotation angle on the surface can also be adjusted, each liquid crystal module can be surely matched over the entire surface. Further, since the directions of the adjusting screw and the adjusting shaft are all the same, the adjustment is easy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal module position adjusting mechanism of a liquid crystal projector according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are exploded perspective views showing a liquid crystal module position adjusting mechanism of a liquid crystal projector according to a first embodiment of the present invention. Reference numeral 1 shown in the figure is a base plate, to which a condenser lens support plate 2 is fastened with screws. The condenser lens support plate 2 presses and fixes the condenser lens f to the base plate 1 by elasticity.

A screw inserted through a long hole in the optical axis direction of the frame is screwed into a screw hole provided in the upper bent portion of the base plate 1, and an optical axis provided in the lower bent portion of the base plate 1. The screws that have passed through the long holes in the direction are screwed with the screw holes provided in the frame.
Can be translated in the optical axis direction.

With the base plate 1 in a movable state, the jig 1
2 is inserted into the hole of the base plate 1, the optical axis position of the base plate 1 is adjusted by the jig 12, and the screws are tightened, whereby the base plate 1 is fixed to the frame.

The base plate 1 has an X-axis adjusting plate mounting base 13
The wedge-shaped member 14 is sandwiched in the upper part, and the X-axis adjusting plate mounting base 13 is mounted to be inclined about 6 ° with respect to the base plate 1.

An elongated hole in the X-axis direction of the X-axis adjustment plate 5 is engaged with a pin erected on the X-axis adjustment plate mounting base 13.
The axis adjustment plate 5 is supported by the X-axis adjustment plate mounting base 13 so as to be movable in the X-axis direction.

A pin 15a erected on a cam lever 15 rotatably supported by a pin erected on the X-axis adjustment plate mounting base 13 engages with a long hole of the X-axis adjustment plate 5 to engage the X-axis adjustment plate. 5
The position in the X-axis direction is adjusted by the rotation of the cam lever 15.

The pin 9 passes through the cam groove 15b of the cam lever 15 and the elongated hole in the Y-axis direction of the X-axis adjustment plate mounting base 13, and is supported by the X-axis adjustment plate mounting base 13 with its position in the Y-axis direction regulated. It is screwed with the threaded rod 7. By rotating the screw rod 7, the cam lever 15 rotates, and accordingly, the position of the X-axis adjustment plate 5 in the X-axis direction is adjusted.

The X-axis positioning screw 16 is inserted through the elongated hole of the X-axis adjusting plate in the X-axis direction, and is screwed with the screw hole of the X-axis adjusting plate mounting base 13. After the adjustment, the X-axis adjustment plate 5 is fixed by tightening the screw.

An elongated hole in the Y-axis direction of the Y-axis adjustment plate 4 is engaged with a pin provided on the X-axis adjustment plate 5, and the Y-axis adjustment plate 4 moves on the X-axis adjustment plate 5 in the Y-axis direction. Supported as possible.

A screw rod 10 supported by the X-axis adjustment plate 5 with its position in the Y-axis direction regulated is screwed with a screw hole of the Y-axis adjustment plate 4. The position of the adjustment plate 4 in the Y-axis direction is adjusted.

The Y-axis positioning screw 17 is the Y-axis adjusting plate 4
The Y-axis adjustment plate 4 is fixed by tightening this screw after adjusting the Y-axis direction position of the Y-axis adjustment plate 4 by inserting the long hole in the axial direction and screwing with the screw hole of the X-axis adjustment plate 5. Is done.

A hole 11c of the liquid crystal module fixing plate 11 shown in FIG. 2 is engaged with a pin 4e provided upright on the Y axis adjusting plate 4, and the liquid crystal module fixing plate 11 is rotatable with the Y axis adjusting plate 4. Supported. The pin 18 which engages with the hole of the liquid crystal module fixing plate 11 is screwed with a screw rod 19 whose position in the Y-axis direction is regulated and supported by the Y-axis adjusting plate 4. LCD module fixing plate 1
1 is adjusted.

The θ-positioning screw 20 is inserted through the long hole of the liquid crystal module fixing plate 11 and is screwed with the screw hole of the Y-axis adjusting plate 4. The liquid crystal module fixing plate 11 is fixed by tightening. The incident side polarizing plate g is fastened via a frame 22 to a boss erected on the liquid crystal mounting bracket 21. The output side polarizing plate p is fastened to the liquid crystal module m via the frame 23, and the liquid crystal module m is fastened to the liquid crystal mounting bracket 21.

The holes provided in the upper and lower bent portions of the liquid crystal mounting bracket 21 are positioned on the pins provided in the upper and lower bent portions of the liquid crystal module fixing plate 11, and the liquid crystal mounting bracket 21 is fixed by screws 24. It is fastened to the plate 11. Thus, the liquid crystal module m, the incident side polarizing plate g, and the output side polarizing plate p are fixed to the liquid crystal module fixing plate 11.

Further, the position of the liquid crystal module m in the optical axis direction,
The position in the X-axis direction and the position in the Y-axis direction are independently adjusted. The condenser lens f fixed parallel to the base plate 1 is inclined by about 6 ° with respect to the liquid crystal module m.

FIG. 3 shows a part of a liquid crystal module position adjusting mechanism of a liquid crystal projector according to a second embodiment of the present invention. In this embodiment, a metal fitting 25 is fastened to the base plate 1,
The adjustment shaft 26 is rotatably supported by the metal fitting 25 in the Y-axis direction. A pinion 27 fixed to the adjustment shaft 26 is engaged with a rack 28 fixed to the frame.

In this embodiment, the optical axis position of the base 1 is adjusted by an adjusting shaft 26 instead of the jig 12 in the first embodiment. Other configurations are the same as those of the first embodiment.

The operation of adjusting the position of the liquid crystal module in the second embodiment will be described with reference to FIG. As shown in FIG. 4A, when the screw rod 7 supported by the X-axis adjustment plate mounting base 13 is rotated, the pin 9 screwed with the screw rod 7 moves up and down, and the cam lever 15 is rotated. The cam lever 15 moves the X-axis adjustment plate 5 in the X-axis direction to adjust the position of the liquid crystal module in the X-axis direction. The stroke of the pin 9 is regulated by the elongated hole of the X-axis adjustment plate mounting base 13 and the X-axis of the liquid crystal module is adjusted.
The axial movement range is determined. After the position in the X-axis direction has been adjusted, the X-axis adjustment plate 5 is fixed to the X-axis adjustment plate mounting base 13 by tightening the X-axis positioning screw 16.

As shown in FIG. 4B, when the screw rod 10 supported by the X-axis adjustment plate 5 is rotated, the Y-axis adjustment plate 4 screwed with the screw rod 10 moves in the Y-axis direction, and Is adjusted in the Y-axis direction. After the position in the Y-axis direction is adjusted, the Y-axis adjustment plate 4 is fixed to the X-axis adjustment plate 5 by tightening the Y-axis positioning screw 17.

As shown in FIG. 4C, when the adjustment shaft 26 supported on the base plate 1 via the metal fitting 25 is rotated, the base plate 1 moves in the optical axis direction due to the engagement between the pinion 27 and the rack 28. The position in the optical axis direction is adjusted. After the position in the optical axis direction is adjusted, the base plate 1 is fixed to the frame by tightening the screws for tightening the base plate 1 to the frame.

As shown in FIG. 4D, when the screw rod 19 supported on the Y-axis adjusting plate 4 is rotated, the pin 18 screwed with the screw rod 19 moves up and down, and the pin 18 is fixed to the liquid crystal module. By rotating the plate 11 around the pin 4e, the rotation angle of the liquid crystal module in the XY plane is adjusted. After the rotation angle is adjusted, the liquid crystal module fixing plate 11 is fixed to the Y-axis adjusting plate 4 by tightening the θ positioning screw 20.

Thus, in the optical axis direction of the liquid crystal module,
The position of each liquid crystal module can be adjusted by adjusting the positions in the X-axis direction and the Y-axis direction and adjusting the rotation angle in the XY plane.

[0043]

According to the liquid crystal module position adjusting mechanism of the liquid crystal projector of the present invention, since the base plate is supported by the frame so as to be able to move in parallel in the optical axis direction, no stress is generated when adjusting the position in the optical axis direction. Fine adjustments can be made easily.

When a rack and a pinion are used as the fine adjustment mechanism, the initial position is clarified by marking a specific position on the rack and the pinion.
The relationship between the rotation amount and the movement amount of the pinion is always constant.

Further, not only the X-axis direction and the Y-axis direction but also XY
Since the rotation angle on the surface can also be adjusted, each liquid crystal module can be surely matched over the entire surface. Further, since the directions of the adjusting screw and the adjusting shaft are all the same, the adjustment is easy.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a part of a liquid crystal module position adjusting mechanism of a liquid crystal projector according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a part of a liquid crystal module position adjusting mechanism of the liquid crystal projector according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a part of a liquid crystal module position adjusting mechanism of a liquid crystal projector according to a second embodiment of the present invention.

FIG. 4 is a diagram showing an adjusting operation of a liquid crystal module position adjusting mechanism of the liquid crystal projector according to the embodiment of the present invention.

FIG. 5 is a configuration diagram illustrating an example of a structure of a liquid crystal projector.

FIG. 6 is an exploded perspective view showing an example of a liquid crystal module position adjusting mechanism of a conventional liquid crystal projector.

[Explanation of symbols]

 Reference Signs List 1 base plate 2 condenser lens support plate 3 eccentric screw 4 Y-axis adjustment plate 5 X-axis adjustment plate 6 screw 7 screw rod 10 screw rod 11 liquid crystal module fixing plate 12 jig 13 X-axis adjustment plate mounting base 14 wedge-shaped member 15 cam lever 16 X-axis positioning screw 17 Y-axis positioning screw 18 Pin 19 Screw rod 20 θ Positioning screw 21 LCD mounting bracket 25 Metal fitting 26 Adjustment axis 27 Pinion 28 Rack

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/13 505 G02F 1/1333 G02F 1/1335 G02B 7/00 H04N 5/74 H04N 9/31 G09F 9 / 00 G03B 33/12

Claims (2)

(57) [Claims] 1. A base plate to which a condenser lens is fixed is supported on a frame so as to be movable in the optical axis direction, and a wedge-shaped member is interposed between the base plate and an X-axis adjustment plate mounting base plate is fastened to adjust the X-axis. The plate is movably supported on the X-axis adjustment plate mounting base plate in the X-axis direction, which is one axis of the liquid crystal module, and the X-axis is rotated by the rotation of a cam lever rotatably supported on the X-axis adjustment plate mounting base plate. The position of the cam lever can be adjusted, and the rotation angle of the cam lever can be adjusted with an adjustment screw supported on the X-axis adjustment plate mounting base plate in the Y-axis direction perpendicular to the X axis and the optical axis. Y on X-axis adjustment plate
It is supported so that it can move in the axial direction, and Y
The position of the liquid crystal module and the liquid crystal module fixing plate to which the polarizing plate is fastened is supported on the Y axis adjustment plate so as to be rotatable in the XY plane, and the Y axis is adjusted. A liquid crystal module position adjustment mechanism of a liquid crystal projector in which a rotation angle can be adjusted with an adjustment screw supported on an adjustment plate in a Y-axis direction. 2. The light of the base plate is rotated by engaging a pinion fixed to an adjustment shaft rotatably supported in the Y-axis direction on the base plate with a rack fixed to a frame and rotating the adjustment shaft. 2. The mechanism for adjusting the position of a liquid crystal module of a liquid crystal projector according to claim 1, wherein the position is adjusted in the axial direction.