JPH05281512A - Light bulb shifter for projector - Google Patents

Abstract

PURPOSE:To accurately position a light bulb with simple structure. CONSTITUTION:This is a shifter for shifting at least two light bulbs out of light bulbs for R, G, and B of a projector, and the X and Y-direction shifter for shifting a light bulb (for example, a light bulb for R) 30 in X and Y directions is composed of a first device for shifting it with adjusting screws 54 and 64 and a second device for shifting it with digital actuators 84 and 96 being displaced by the digital signals from digital signal output circuits 90 and 98 for driving in X and Y direction. Similarly, the theta-direction turning gear for rotating the light bulb 30 in the theta direction around an axis 70 is composed of a first device for rotating it with an adjusting screw 76 and a second device for rotating it with a digital actuator 102 being displaced with the digital signal from a digital signal output circuit 104 for driving in - or + direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention decomposes light output from a light source into three primary color lights of R, G, B, and then modulates the intensity of the light with a light valve for R, G, B, and then The present invention relates to an improvement of a light valve moving device in a projection device which is combined and projected on a screen by a projection lens.

[0002]

2. Description of the Related Art Conventionally, this type of projection apparatus has been constructed as shown in FIG. That is, the lamp 10 and the reflector 1
The light output from the light source 14 composed of 2 is supplied to the cold mirror.
It is input to the dichroic mirrors 20 and 22 through the 16 and the cold filter 18 and decomposed into three primary color lights of R, G and B. Then, the R, G, and B primary color lights are respectively passed through the condenser lenses 24, 26, and 28 to R,
The light intensity is modulated by inputting it to the liquid crystal light valves 30, 32 and 34 for G and B, and then the dichroic mirror 36,
The colors are combined at 38 and projected onto a screen (not shown) by the projection lens 40. Numerals 42 and 44 are mirrors for guiding light in a predetermined direction.

As shown in FIG. 5, the liquid crystal light valve 30 for R has a large number of pixels (pixels) 46r arranged on one side of a (for example, 100 to 200 .mu.m), and a driving voltage is applied to these pixels 46r. , And horizontal connecting lines 48 ,. The liquid crystal light valves 32 and 34 for G and B are also formed similarly to the liquid crystal light valve 30 for R.

In the projection apparatus, the R, G, and B liquid crystal lights for R, G, and B are accurately overlapped so that each pixel of the projected image on the screen has an appropriate color. The corresponding pixels 46r, 46g of the valves 30, 32, 34,
It is necessary to adjust the position of 46b. In particular, high precision positioning is required when increasing the definition of the display or increasing the screen size. Conventionally, a light valve moving device for adjusting the position of the R (or G) liquid crystal light valve 30 (or 32) has been configured as shown in FIG.

That is, the R liquid crystal light valve 30 is mounted in the mounting hole formed in the central portion of the first frame 49,
Guide tools 50, 50 for slidably guiding the first frame 49 in the X direction are fixed to the second frame 52.
Adjusting screw 54 and compression spring 56 attached to the frame 52,
At 56, the liquid crystal light valve 30 for R is moved in the X direction to perform positioning adjustment, and when the adjustment is completed, the fixing screw 58
Fix with.

Guide members 60, 60 for slidably guiding the second frame 52 in the Y direction are fixed to the third frame 62,
By adjusting the movement of the second frame 52 in the Y direction with the adjusting screw 64 attached to the third frame 62 and the compression springs 66, 66, the positioning adjustment of the R liquid crystal light valve 30 in the Y direction can be performed. After making the adjustment, fix with the fixing screw 68.

A fourth guide means 72, 72 is provided for guiding the third frame 62 to rotate in the Θ direction around the rotation support shaft 70.
The third frame 6 is fixed by the adjusting screw 76 and the compression springs 78, 78 fixed to the frame 74 and attached to the fourth frame 74.
The position adjustment of the R liquid crystal light valve 30 in the Θ direction is performed by adjusting the Θ direction of 2 and the fixing screws 80, 80 are fixed after the adjustment is completed. The mechanism for moving and adjusting the liquid crystal light valve 32 for G has the same structure as the mechanism for moving and adjusting the liquid crystal light valve 30 for R as shown in FIG.

[0008]

However, the conventional light valve moving device shown in FIG. 6 has the following problems. (A) Adjustment screws 54, 64, 76 and compression springs 56, 5
6, 66, 66, 78, 78 were used to adjust the positioning of the liquid crystal light valve 30 for R in the X, Y, and Θ directions, and when the adjustment was completed, it was fixed with fixing screws 58, 68, 80, 80. Therefore, the structure is simple, but the positioning accuracy is poor.

(B) A moving device for positioning adjustment is incorporated in the housing of the projection device, and mechanical liquid energy is used to move the liquid crystal light valves 30, 32, 34 to move X,
Since the positioning adjustments in the Y and Θ directions were made, when the liquid crystal light valves 30, 32, and 34 were misaligned with time, the device had to be disassembled and corrected.
There was a problem that the correction operation of was troublesome. Also,
When the liquid crystal light valves 30, 32, and 34 are moved to perform positioning adjustment at the time of product shipment, the adjustment operation in the maker is troublesome because the adjustment must be performed without the lid. there were.

The present invention has been made in view of the above-mentioned problems, and the R, G, and B light valves can be accurately positioned without complicating the structure, and for correction and adjustment. It is an object of the present invention to provide a light valve moving device of a projection device that can facilitate the operation of.

[0011]

According to the present invention, light output from a light source is decomposed into three primary color lights of R, G and B, and then R,
In a projection device in which light intensities for G and B are used to modulate light intensities, and then the colors are combined and projected on a screen by a projection lens, at least one of the R, G, and B light valves is used. A moving device for moving the two light valves, the moving device for moving the light valve in the X and Y directions of the light valve surface, and the light valve for moving the light valve perpendicular to the light valve surface. A Θ direction rotating device for rotating in the Θ direction around the axis, wherein the X, Y direction moving device is a first X, Y direction moving device for sliding the light valve by mechanical energy. And a second X- and Y-direction moving device that slides the light valve by driving a corresponding number of piezoelectric elements with a digital signal, wherein the Θ-direction rotating device is mechanical energy. La A first Θ direction rotating device for rotating the light valve, and a second Θ direction rotating device for rotating the light valve by driving a corresponding number of piezoelectric elements by a digital signal. To do.

In order to simplify the structure of the moving device for moving the light valve, a plurality of piezoelectric elements of the second X and Y direction moving device are provided at the tip of the driving portion of the first X and Y direction moving device. The plurality of piezoelectric elements of the second Θ-direction rotating device are coupled to the tip of the driving unit of the first Θ-direction rotating device.

[0013]

The light output from the light source is R,
Decompose into three primary colors of G and B, then modulate the intensity of the light with R, G, and B light valves, then combine the colors and project on a screen with a projection lens, then project on the screen. Display the image. At this time, at least two (for example, R and G) light valves of the R, G, and B light valves are moved in the X and Y directions of the light valve surface by the X and Y direction moving devices. Positional deviation can be adjusted,
The Θ-direction rotating device can rotate in the Θ-direction around an axis perpendicular to the light valve surface to adjust the rotational deviation.

In addition, the X, Y direction moving device drives the light valve by driving a corresponding number of piezoelectric elements by digital signals in addition to the first X, Y direction moving device which slides the light valve by mechanical energy. Since it is equipped with a second X- and Y-direction moving device that slides on and off,
Directional movement can be controlled by digital signals. The Θ-direction rotating device is a second Θ-direction rotating device that rotates a light valve by driving a corresponding number of piezoelectric elements with a digital signal, in addition to a first Θ-direction rotating device that rotates a light valve with mechanical energy. Therefore, the rotation of the light valve in the Θ direction can be controlled by a digital signal. Therefore, it is possible to easily and accurately superpose the pixels.

A plurality of piezoelectric elements of the second X- and Y-direction moving device are coupled to a tip portion of a driving portion of the first X and Y-direction moving device to rotate the plurality of piezoelectric elements of the second Θ-direction rotating device in the first Θ-direction. When the light valve is coupled to the tip of the drive unit of the device, the structure of the moving device for moving the light valve can be further simplified.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a light valve moving device for a projection device according to the present invention will be described below with reference to FIGS. 1 and 2, the same parts as those in FIGS. 4 to 6 are designated by the same reference numerals. In FIGS. 1 and 2, reference numeral 49 is a first frame, and an R liquid crystal light valve 30 is mounted in a mounting hole formed in the central portion of the first frame 49.

Reference numeral 52a denotes a second portion having a light transmitting hole formed in the central portion.
A guide 50, 5 for guiding the first frame 49 slidably in the X direction to the second frame 52a.
0 is fixed. The second frame 52a is provided with compression springs 56, 56 for urging the first frame 49 in one direction in the X direction (from left to right) by a spring force, and a bearing. 82 is fixed. This bearing 82
An adjusting screw 54 is screwed into the screw, and the tip of the adjusting screw 54 is passed through the digital actuator 84 to the first frame.
It is in contact with the side surface of the frame 49.

The guides 50, 50, the adjusting screw 54 and the compression springs 56, 56 are mechanically energies to drive the first member.
Frame 49 (hence liquid crystal light valve 30)
Forming a first X-direction moving device that slides in the direction.
That is, by turning the adjusting screw 54, the first frame 49 is pushed and slid in the other direction (right to left) in the X direction against the spring force of the compression springs 56, 56. It is constructed so that it can slide in the opposite direction.

The digital actuator 84 is constructed as shown in FIG. 1 (b). That is, seven piezoelectric elements (for example, piezoelectric ceramic elements) 86 to 86 are connected in series, electrodes 88 to 88 are fixed to both end portions and boundary portions thereof, and the first electrode 88 counted from the tip side is connected to the first terminal ( Three
Terminal for inputting LSB signal of bit signal) D
1, the third electrode 88 is coupled to the second terminal D2, and the fifth and seventh electrodes 88, 88 are the third terminal (the MSB signal of the 3-bit signal is input) D3.
The second, fourth, sixth, and eighth electrodes 88 to 88 are connected to a common terminal (for example, a common terminal for grounding) C.

The first, second and third terminals D1, D2, D
An X-direction driving digital signal output circuit 90 is coupled to the circuit 3, and the X-direction driving digital signal output circuit 90 and the digital actuator 84 are first digital signals.
Frame 49 (hence liquid crystal light valve 30)
Forming a second X-direction moving device that slides in the direction.

That is, the corresponding piezoelectric signal DS is supplied from the X-direction driving digital signal output circuit 90 to the piezoelectric elements 86 to 86 via the first, second and third terminals D1, D2 and D3. Figure 1
As shown in (b) of FIG.
It is configured to be able to push and slide by the distance L in the other direction (direction from right to left) in the X direction against the spring force of 6, 56. The data of the digital signal DS is given, for example, by manually turning the volume or by a control signal from a microcomputer controlled by the deviation correction program.

Reference numeral 62a is a third frame having a light transmitting hole 92 formed in the center thereof, and the second frame 52a is guided to the third frame 62a so as to be slidable in the Y direction. The guide tools 60, 60 are fixed, and an engagement hole 93 is formed. The third frame 62a is provided with compression springs 66, 66 for urging the second frame 52a in one direction in the Y direction (a direction from top to bottom) by a spring force, and a bearing. 94 is fixed. An adjusting screw 64 is screwed onto the bearing 94, and the tip end of the adjusting screw 64 is in contact with the side surface of the second frame 52a via a digital actuator 96.

The guides 60, 60, the adjusting screw 64, and the compression springs 66, 66 are mechanical energy to drive the second member.
A first Y-direction moving device that slides the frame 52a (and therefore the liquid crystal light valve 30) in the Y-direction is formed. That is, by turning the adjusting screw 64, the second frame 52a is pressed and slid in the other direction of the Y direction (from the bottom to the top) against the spring force of the compression springs 66, 66, and vice versa. It is configured so that it can slide in any direction.

The digital actuator 96 is constructed in the same manner as the digital actuator 84, and is connected to a Y direction driving digital signal output circuit 98 to form a second Y direction moving device. That is, by applying a predetermined digital signal DS from the Y direction driving digital signal output circuit 98 to the piezoelectric element of the digital actuator 96, the corresponding piezoelectric element is displaced, and the second frame 52a is compressed by the compression springs 66, 66. It is configured so as to be able to push and slide by the distance L in the other direction of the Y direction (direction from the bottom to the top) against the spring force of.

Reference numeral 74a denotes a fourth frame having a light transmitting hole 95 formed in the central portion thereof. The fourth frame 74a is rotatably engaged with the engaging hole 93 of the third frame 62a. A mating rotary support shaft 70 is projected. The fourth frame 74a is provided with guides 72, 72 for guiding the third frame 62a to rotate in the Θ direction around the rotation support shaft 70. The fourth frame 74a is provided with compression springs 78, 78 for biasing the third frame 62a in one direction (counterclockwise direction) of the Θ direction by a spring force, and a bearing 100 is provided. It is fixed. This bearing 100
An adjusting screw 76 is screwed into the screw, and the tip of the adjusting screw 76 is in contact with the side surface of the third frame 62a via the digital actuator 102.

The guides 72, 72, the adjusting screw 76 and the compression springs 78, 78 are mechanical energy to cause the third member to move.
It forms a first Θ direction rotating device that rotates the frame 62a (and therefore the liquid crystal light valve 30) in the Θ direction. That is, by turning the adjustment 76, the third frame
It is configured such that the shaft 62a can be rotated in one direction (clockwise direction) in the Θ direction against the spring force of the compression springs 78, 78 and can be rotated in the opposite direction.

The digital actuator 102 has the same structure as the digital actuator 84, and forms a second Θ direction rotating device by being combined with the Θ direction driving digital signal output circuit 104. That is,
The corresponding piezoelectric element is displaced by applying a predetermined digital signal DS from the Θ direction driving digital signal output circuit 104 to the piezoelectric element of the digital actuator 102, and the third frame 62a is compressed by the compression springs 78, 78. It is configured so that it can be rotated by an angle corresponding to the distance L in one direction (clockwise direction) of the Θ direction against the force.

The liquid crystal light valve 32 for G is similar to the liquid crystal light valve 30 for R in that the first, second X and Y direction moving devices for G and the first and second θ direction rotating devices are used. , X, Y-direction sliding adjustment and Θ-direction rotating adjustment. The configuration of the projection device is the same as the configuration shown in FIG. 4 except the configuration for moving and rotating the R and G liquid crystal light valves 30, 32.

Next, the operation of the above embodiment will be described with reference to FIGS. 3 and 4. (A) In FIG. 4, the light output from the light source 14 is decomposed by the dichroic mirrors 20, 22 into three primary color lights of R, G, B, and then R, G, B via the condenser lenses 24, 26, 28. To the liquid crystal light valves 30, 32, and 34 for modulating the light intensity, and the dichroic mirror 36,
The colors are combined at 38 and projected on the screen by the projection lens 40, and the projected image is displayed on the screen.

(B) Observing the overlapping state of the pixels in the projected image on the screen, the rough adjustment and the fine adjustment for superposition are performed. For example, the overlapping state of the pixels is determined by observing the colors of the overlapping portions of the R, G, and B pixels in the test area of the projected image. And
Based on this determination, the first X and Y direction moving device and the first Θ
The position of the liquid crystal light valve 30 for R is roughly adjusted by a method similar to the conventional example using the directional rotating device.

That is, by turning the adjusting screw 54 of the first X-direction moving device, the first frame 49 is compressed by the compression spring 5.
It moves in the first Y direction by pressing and sliding in one direction (from right to left) in the X direction against the spring force of 6, 56 and by sliding in the opposite direction to adjust the position in the X direction. By turning the adjusting screw 64 of the device, the second frame 52a is pressed and slid in one direction (from the bottom to the top) in the Y direction against the spring force of the compression springs 66, 66, or in the opposite direction. By sliding or adjusting the position in the Y direction, and turning the adjusting screw 76 of the first Θ direction rotating device, the third frame 62a is moved against the spring force of the compression springs 78, 78 in one of the Θ directions ( Adjust the position in the Θ direction by rotating in the clockwise direction or in the opposite direction.

(C) Next, fine adjustment peculiar to the present invention is performed using the second X and Y direction moving device and the second Θ direction rotating device. First, the fine adjustment by the second X-direction moving device will be described. From the X-direction driving digital signal output circuit 90 of the second X-direction moving device, the first, second, and third terminals D1, D2,
The corresponding piezoelectric element 8 is provided by giving a predetermined digital signal DS to the digital actuator 84 via D3.
6 to 86 are displaced, and as shown in FIG.
The frame 49 is pressed and slid by a distance L in one direction in the X direction (direction from right to left) against the spring force of the compression springs 56, 56.

The above-mentioned relationship between DS and L is, for example, as shown in FIG. 3, when DS is "000", "001", "01".
When “0”, ..., “111”, L is “0”,
“1ΔL”, “2ΔL”, ..., “7ΔL”. Here, ΔL represents the displacement amount of one piezoelectric element 86, and has a predetermined value within the range of 2 to 4 μm, for example. For this reason, even for a fine pixel, the amount is sufficiently small, and accurate movement adjustment in the X direction can be performed.

Next, fine adjustment by the second Y-direction moving device will be described. From the Y direction driving digital signal output circuit 98 of the second Y direction moving device to the digital actuator 9
When a predetermined digital signal DS is given to 6, the above-mentioned second X
Similarly to the movement adjustment in the X direction by the direction moving device, the second frame 52a is pressed by the distance L in one direction in the Y direction (from the bottom to the top) against the spring force of the compression springs 66, 66. Slide.

Next, fine adjustment by the second Θ direction rotating device will be described. When a predetermined digital signal DS is given to the digital actuator 102 from the Θ-direction driving digital signal output circuit 104 of the second Θ-direction rotating device, substantially the same as the X-direction movement adjustment by the second X-direction moving device described above, The third frame 62a is rotated against the spring force of the compression springs 78, 78 in one direction (clockwise direction) in the Θ direction around the rotation support shaft 70 by an angle corresponding to the distance L.

(D) Then, the rough adjustment and the fine adjustment of the liquid crystal light valve 32 for G are performed by the same method as the position adjustment for the liquid crystal light valve 30 for R described in (b) and (c) above. Do. As a result, the corresponding R, G, and B pixels of the projected image can be overlapped with a predetermined accuracy (for example, the LSB has an accuracy of 0.4 pixel),
The liquid crystal light valves 30 and 32 for R and G are fixedly held at optimum positions. The B liquid crystal light valve 34 is fixed and held in advance at a predetermined position.

In the above embodiment, the plurality of piezoelectric elements of the second X and Y direction moving device are coupled to the tip of the driving portion of the first X and Y direction moving device, and the plurality of piezoelectric elements of the second θ direction rotating device are connected. Is connected to the tip of the drive unit of the first Θ direction rotating device to simplify the configuration, but the present invention is not limited to this, and a plurality of piezoelectric elements of the second X and Y direction moving device is provided. And a plurality of piezoelectric elements of the second θ-direction rotating device,
Of course, it may be provided at a position independent of the first X-direction and Y-direction moving devices and the first Θ-direction rotating device.

In the above embodiment, the moving device for moving the R, G light valves of the R, G, B light valves is provided, but the present invention is not limited to this. A moving device for moving at least two light valves of the R, G, B light valves. For example, it may be a moving device for moving all of the R, G, B light valves, or a device for moving the G, B light valves.

[0039]

As described above, the light valve moving device of the projection device according to the present invention is such that the X, Y direction moving device slides the light valve by mechanical energy, and the first X and Y direction moving device is provided. Second X, Y sliding the light valve by driving a corresponding number of piezoelectric elements with digital signals
A first rotation device for rotating the light valve with mechanical energy, and a light signal rotation device for driving a corresponding number of piezoelectric elements with a digital signal. Since the second Θ direction rotation device is provided, the following effects are obtained.

(A) The movement of the light valve in the X and Y directions and the rotation in the Θ direction can be directly controlled by mechanical energy and can be controlled by a digital signal, so that R, G and B can be controlled. It is possible to easily and accurately superimpose the corresponding pixels of the light valve for use.

(B) Since the positioning of the R, G, and B light valves can be adjusted by the digital signal, it is easy to correct the time lag and adjust the product. For example, since the position of the light valve moving device itself can be adjusted by a digital signal from the outside while it is still installed in the housing, it is easy for the user to correct the time lag and for the manufacturer to adjust the position when shipping the product. become.

A plurality of piezoelectric elements of the second X- and Y-direction moving device are coupled to the tips of the driving parts of the first X and Y-direction moving device to rotate the plurality of piezoelectric elements of the second θ-direction rotating device in the first θ direction. When the light valve is coupled to the tip of the drive unit of the device, the structure of the moving device for moving the light valve can be further simplified.

[Brief description of drawings]

FIG. 1 shows a main part of an embodiment of a light valve moving device of a projection device according to the present invention, in which (a) is a plan view of a device part for moving a light valve for R in X, Y and Θ directions. , (B) are explanatory views for explaining the digital actuator 84 of (a) and its surroundings.

FIG. 2 is an exploded perspective view showing a main part of FIG.

FIG. 3 is a characteristic diagram showing characteristics of the digital actuator 84 of FIG.

FIG. 4 is a schematic configuration diagram showing a general configuration of a projection device.

FIG. 5 is an explanatory diagram illustrating a pixel of the liquid crystal light valve of FIG.

FIG. 6 is a plan view showing a light valve moving device of a conventional projection device.

[Explanation of symbols]

30 ... R liquid crystal light valve, 32 ... G liquid crystal light valve, 34 ... B liquid crystal light valve, 49 ...
First frame, 50, 60, 72 ... Guide tool, 52a ...
Second frame, 54, 64 ... Adjusting screws, 56, 66,
78 ... Compression spring, 62a ... Third frame, 70 ... Rotating spindle, 74a ... Fourth frame, 84, 96, 102 ...
Digital actuator, 86 ... Piezoelectric element, 86 ... Electrode, 90 ... X-direction driving digital signal output circuit, 98
... Y direction driving digital signal output circuit, 104 ... Θ direction driving digital signal output circuit, C ... Common terminal for digital signal supply (for example, common terminal for grounding), D1, D
2, D3 ... Individual terminals for digital signal supply, .THETA .... Direction of rotation of light valve.

Claims (2)

[Claims] 1. A light output from a light source is decomposed into three primary color lights of R, G and B, and then the intensity of the light is modulated by a light valve for R, G and B, and then color combination is performed by a projection lens. Screen
In a projection device adapted to project on
A moving device for moving at least two light valves of the G and B light valves, which is an X, Y direction moving device for moving the light valves in the X and Y directions of the light valve surface. , A Θ direction rotating device for rotating the light valve in a Θ direction around an axis perpendicular to the light valve surface, wherein the X and Y direction moving device slides the light valve with mechanical energy. A first X and Y direction moving device that moves, and a second X and Y direction moving device that slides on the light valve by driving a corresponding number of piezoelectric elements by a digital signal.
The direction rotating device includes a first θ direction rotating device that rotates the light valve with mechanical energy, and a second θ direction rotating device that rotates the light valve by driving a corresponding number of piezoelectric elements with a digital signal. A light valve moving device for a projection device, comprising: a rotating device. 2. A plurality of piezoelectric elements of a second X and Y direction moving device are coupled to a tip portion of a driving portion of the first X and Y direction moving device, and a plurality of piezoelectric elements of a second θ direction rotating device. Is
2. The light valve moving device for a projection device according to claim 1, wherein the light valve moving device is connected to a tip portion of a drive portion of the first Θ direction rotation device.