JP2966566B2 - Liquid crystal panel mounting device in optical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical apparatus having a liquid crystal panel unit such as a liquid crystal video projector.
When adjusting the mounting position of the liquid crystal panel units and combining the light that has passed through each liquid crystal panel on the light receiving surface of the projection lens, adjust the optical path length for each liquid crystal panel unit to obtain a just-focused image with the same image focus. It is something that can be obtained.

[0002]

2. Description of the Related Art As shown in FIG.
Equipped with a dichroic mirror (20), a total reflection mirror (21), and a liquid crystal panel unit (30), the white light emitted from the light source lamp (10) is separated into R, G, and B light, and each is separated into each liquid crystal panel. Then, the images are synthesized at the position of the light receiving surface of the projection lens (90). In order for the light that has been split and passed through each liquid crystal panel unit to be correctly combined at the position of the light receiving surface of the projection lens, the optical path length from each liquid crystal panel unit to the light receiving surface must match. That is, it is necessary that the relationship of A + B = E + C + D = F + D is maintained in FIG. If any one of the liquid crystal panel units is displaced, the above relationship is broken and the image shown on the screen becomes unclear.

Conventionally, as shown in FIG. 9, a mounting bracket (33) for a liquid crystal panel unit (30) having a condenser lens (31), a liquid crystal panel (70), and an inlet and an outlet polarizer is attached to upper and lower chassis. When mounting, one of the chassis and bracket has a long hole in the center of the bracket in the direction perpendicular to the optical axis.
(52) and a pair of long holes (55) parallel to the optical axis on both sides thereof, and the eccentric pin (34) fitted in the central long hole (52) is adjusted to move the unit (30) to the optical axis. The bracket (33) around the eccentric pin (34) by hand.
The liquid crystal unit (30) was tilted to the left and right in the range of (5) to determine the optical path length of the liquid crystal unit (30), and was disposed so as to be orthogonal to the optical axis.

[0004] The above-mentioned adjustment structure is provided with respect to the eccentric pin (34).
Since the unit (30) is manually tilted, skill is required, and the adjusting operation is difficult. In addition, since the adjustment of the attachment to the lower chassis is performed once the upper chassis is removed, the operation is troublesome.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an eccentric pin (34).
The present invention provides a device which can easily adjust the mounting position of a liquid crystal panel unit using a tool having a flat tip such as a screwdriver.

Another object of the present invention is to easily adjust the mounting positions of the upper and lower mounting brackets (33) and (56) from the same direction outside the chassis without removing the chassis. It is an object of the present invention to provide a device that can perform

[0007]

[Configuration] The liquid crystal panel unit (30) is connected to the upper and lower chassis (50) (5
From the top and bottom of the unit, attach the bracket (3
3) (56) protruding, each bracket (33) (56) is upper and lower chassis
(50) and (51) are mounted movably in the optical axis direction, and at least one bracket (33) is cut into both sides with the optical axis in between (36) (3)
6), and a receiving portion (53) is provided on the chassis (51) so as to face the outside of the cut (36). The other bracket (56)
Apply cuts (36) and (36) on both sides of the optical axis in the same manner as the bracket (33), and the chassis (52) is provided with receiving portions (54) and (54) at opposing positions outside the cut. I have.

[0008]

When the liquid crystal panel unit is mounted on the chassis (50) (51), the unit (30) is moved back and forth in the direction of the optical axis, and the optical path length is set so as to substantially conform to predetermined conditions. Next, as shown in FIG. 7, a tool (1) having a flat tip such as a flathead screwdriver is fitted into the receiving portion (53) of the chassis and the notch (36) of the bracket, and the liquid crystal panel unit is twisted by the tool (1). Can rotate. Lower the tool (1) through the hole in the receiving part (53) of the upper chassis (51) to the lower chassis (50).
The orientation of the liquid crystal panel unit with respect to the optical axis can be adjusted by simultaneously fitting the tip of (1) into the notch (36) of the lower bracket and the recess of the receiving portion (54) provided on the lower chassis and twisting the tool. When the left and right adjustments are opposite and of the same amount, the bracket translates in the direction of the optical axis, and can be tilted left or right with different amounts of adjustment. By performing the same operation for each of the upper bracket and the lower bracket, the optical path length can be adjusted to a constant value over the entire surface of the liquid crystal panel (70).

[0009]

According to the present invention, a notch (36) and a receiving hole (53) formed in the bracket (33) and the chassis (51) respectively using a tool having a flat tip such as a screwdriver from the outside of the chassis.
Can be used to make precise adjustments and does not require skill. When the tool is further pushed in from the hole in the receiving part of the upper panel and extended to the lower chassis, the inclination of the lower bracket (56) can be adjusted by the same operation, without removing the upper chassis, and adjusting the upper bracket Since the mounting adjustment of the lower bracket can be performed from the same side as above, the adjustment and the mounting operation are extremely easy.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the liquid crystal panel unit is a condenser lens as shown in FIGS.
(31) and a fixed-side unit to be attached to the upper and lower chassis including an entrance-side polarizing plate (46), and a pilot provided between the fixed-side unit including a liquid crystal panel (70) and an exit-side polarizing plate (71). By fitting the pin (68) and the receiving hole (73), the fixed unit is detachably attached to the detachable unit.

The fixed unit includes a condenser lens (3
1) and the lens mounting frame (32) provided with the entrance side polarizing plate (46) are fixed to the fixed frame (40) via the spacer (37), and the fixed frame (4
In contrast to (0), the movable frame (60) is mounted in a plane parallel to the plane of the fixed frame so as to be able to move and rotate vertically and horizontally. The upper and lower parts of the lens mounting frame (32) are chassis (50)
It is bent in parallel with (51) to form brackets (33) and (56). As shown in FIG. 6, the upper bracket (33) is provided with screw holes (35) on both sides of the eccentric screw (34) and the eccentric screw across the optical axis, respectively, as shown in FIG. Corresponding to the eccentric screw (34) and the screw hole (35), respectively, a long hole (52) extending in the direction orthogonal to the optical axis and a pair of long holes (55) parallel to the optical axis are respectively opened, and the eccentric screw ( The upper bracket (33) is fixed to the upper chassis (51) by fitting the set screws (34) into the elongated holes (52), the set screws (38) into the screw holes (35) through the elongated holes (55), respectively.

As shown in FIG. 8, the lower bracket (56) has a long hole (57) extending in a direction perpendicular to the optical axis and a pair of two holes extending in the optical axis direction on both sides of the long hole (57) with the optical axis interposed therebetween. Three holes (3) formed in the upper bracket (33).
Insert the tool from 9), adjust the eccentric screw (58) and adjust the slot (5).
9) Attach the set screw (43) to each.

The upper bracket (33) forms V-shaped cuts (36) on both sides as shown in FIGS. 6 and 7, and the upper chassis (51) is located at a position corresponding to the cuts (36). A receiving portion (53) having a V-shaped cut and a rectangular portion is punched and opened.
The cut of the receiving part (53) and the V-shaped cut of the bracket (36)
As shown in FIG. 7, the tip of a flat screwdriver or the like is flattened, and the bracket (33)
Can turn the eccentric pin (34) as a fulcrum. After correctly aligning the lens mounting frame (32) in a direction perpendicular to the optical axis, the set screw (38) is tightened and fixed.

A fixed frame (40) is integrally mounted on the lens mounting frame (32) via a spacer (37). The fixed frame
The movable frame (60) is attached to the (40) so as to be able to move up and down, right and left, and rotate in parallel with the plane of the fixed frame. As shown in FIG. 4, the movable frame (60) is attached to the fixed frame (40) by passing a mounting pin through a washer (44) into a large hole provided at each of the four corners of the movable frame, and by a holding plate (45). Retainable, movable frame
(60) can freely move in a plane parallel to the fixed frame (40) in the range of the large hole.

A projecting piece (63) protrudes above the fixed frame above the moving frame, an elongated hole (64) in the optical axis direction is opened at the center, and an eccentric pin (64) is formed above the fixed frame (40). The movable frame is fitted in the elongated hole (64) of the movable frame. Furthermore, as shown in FIG.
A compression spring (78) is arranged between the mounting bracket (33) and the projection (63) to push up and urge the screw, and screw the holding screw (65) into the spring (78). Pushing down the protruding piece (63).
The movable frame (60) can be moved laterally by rotating the eccentric pin (42). The movable frame (60) can be straightened by adjusting the right and left push-down screws because the movable frame can be pushed down against the compression spring (78) by screwing in the left and right holding screws (65) (65). Up and down movement or right and left rotation movement adjustment can be performed.

The detachable unit has projecting pieces (74) and (72) projecting above and below the liquid crystal panel mounting frame, and the lower projecting piece (72) matches the position of the pilot pin (68) provided on the movable frame. Receiving hole (73). The dowels (small hemispherical protrusions) (66) provided on the upper protruding piece (63) on the movable frame and the mounting screw holes
In response to (69), a receiving hole (75) and a through hole (76) are opened.

The detachable unit and the fixed unit are connected by lowering the detachable unit from the opening formed in the upper chassis and fitting the receiving hole (73) into the lower pilot pin (68). Raise and project the protruding piece (74) onto the movable frame. The receiving hole (75) can be positioned by fitting into the dowel (66).
It can be screwed to (69) and the two units can be integrally connected. The liquid crystal panel (70) and the exit-side polarizing plate (71) are
Since the movable frame is moved in the horizontal direction by the eccentric screw (42), the liquid crystal panel (70) is horizontally moved by a small amount with respect to the optical axis, and the image projected on the screen is fixed. Convergence can be adjusted. By adjusting the left and right holding screws (65) on the movable frame and tilting the movable frame (65) to the left or right, the polarization direction of the exit-side polarizing plate (71) with respect to the entrance-side polarizing plate (46) is changed. Can be adjusted to direct light. Further, by adjusting the left and right holding screws (65) by the same amount, the liquid crystal plate can be moved up and down, and the convergence of the image projected on the screen can be improved.

To replace the liquid crystal panel (70), the operation at the time of mounting may be performed in the reverse direction. remove. If you pull the unit upward, you can take it out of the chassis.

The implementation of the present invention is not limited to the above embodiment, and design changes can be made within the scope of the claims. For example, a block having a cut may be mounted on the lower bracket (56) of the lens mounting frame, and a V-shaped receiving hole may be punched and opened in the lower chassis (50) corresponding to the block. The elongated hole and the eccentric pin formed between the chassis and the bracket are, for example, provided with an eccentric pin in the upper chassis (51) and an elongated hole in the mounting bracket (33) to operate the eccentric pin on the chassis. Mounting frame (3
It is natural that 2) can be moved and adjusted in the optical axis direction.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal projector.

FIG. 2 is a perspective view showing a state where a detachable unit and a fixed unit are detached from each other;

FIG. 3 is a longitudinal sectional view of the same.

FIG. 4 is a longitudinal sectional view showing a state where a liquid crystal panel unit is attached to a chassis.

FIG. 5 is a front view of the liquid crystal panel unit.

FIG. 6 is a plan view of the liquid crystal panel unit.

FIG. 7 is an enlarged plan view of a cut portion of the mounting bracket.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 4;

FIG. 9 is a plan view of a conventional liquid crystal panel unit.

[Explanation of symbols]

 (1) Tool (30) LCD panel unit (32) Lens mounting frame (33) Mounting bracket (36) Notch (50) Lower chassis (51) Upper chassis (52) Slot (53) Receiver (60) Movable Frame (70) Liquid crystal panel (71) Exit side polarizing plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/13 505 G02F 1/1335 G02B 7/00 G02B 27/62

Claims (2)

(57) [Claims] 1. A condenser lens (31), an entrance-side polarizing plate
(46), a liquid crystal panel (70), a liquid crystal panel unit equipped with an exit-side polarizing plate (71), and upper and lower mounting brackets (33) (46)
In the optical device mounted on the upper and lower chassis (50) (51) so that the position can be adjusted, one bracket (33) pivots the center part to the chassis (51) and both sides sandwiching the optical axis. Notches (36) on both sides of the mounting bracket (33) at
Wherein the chassis is provided with receiving portions (53) each having a notch facing the outside of the notch (36) of the bracket (33). 2. The upper and lower brackets (33) and (5) of the liquid crystal panel.
6) pivots the center part to the upper and lower chassis (50) (51), respectively, and cuts (36) (36) respectively on both sides of the optical axis
The upper and lower chassis (50), (51) are provided with receiving portions (53), (54) each having a cut facing the outside of the cut (36). apparatus.