JP3413666B2 - Optical element rotating device and liquid crystal 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 novel optical element rotating device.
And a liquid crystal projector . For details, the controlled part
Linear model that can move the material in the desired cycle
The optical element rotation device that can rotate the optical element in the direction of the optical axis by the motor and the controlled member
An object of the present invention is to provide a liquid crystal projector capable of fine display by means of a linear motor that can be moved by a wheel .

[0002]

2. Description of the Related Art A liquid crystal projector having a liquid crystal panel, a light source, a projection lens, and a control circuit is known, and video signals of an odd field and an even field are displayed on the same pixel of the liquid crystal panel, and each field has a time. Screen, and the projection position of the image of each field on the screen is shifted vertically by one line in synchronization with the vertical sync signal of the video signal, so that the roughness of the screen There is known a method of compensating for and finely displaying.

[0003]

However, in the past, there was no suitable means for vertically shifting the image of each field.

[0004]

According to the optical element rotating apparatus of the present invention, the width becomes narrower toward one side in the vertical direction, and the horizontal axis orthogonal to the optical axis of the apparatus is rotatable about the machine frame. A wedge prism supported and a drive mechanism are provided, and the wedge prism is reciprocally rotated by the drive mechanism, and the drive mechanism is provided with respect to the machine frame.
A moving member provided slidably in the optical axis direction,
The fixed pin provided on the moving member and the inside of the moving member
Inside the sliding hole formed to extend in the optical axis direction
It can be pushed into the fixing pin
Fixed to one of the moving pin and the machine frame or the moving member.
A coil and a magnet fixed to the other
Is connected to the frame that holds the wedge prism.
The connecting piece to be inserted between the fixed pin and the movable pin.
It is what you have.

[0005]

[0006] In addition, the present invention a liquid crystal projector, the above
Optical element rotation device and odd field and even field
Field is displayed in the same pixel and each field is
LCD panel, light source, and projection
And a light source according to the vertical sync signal.
Drives the optical element rotation device to display the image of odd field and even
Above in different directions with respect to the field image
It is aimed at the wedge prism.

[0007]

[0008]

Therefore, in the optical element rotating device of the present invention,
By rotating the wedge prism by the drive mechanism that reciprocally rotates the wedge prism, light passing through the wedge prism can be vertically swung in a desired cycle. Therefore, by incorporating this optical element rotation device in the optical path of the liquid crystal projector, it is possible to perform fine display, and it is arranged as a single unit between the existing liquid crystal projector and the screen to rotate the wedge prism. If the cycle is controlled by the vertical synchronizing signal of the video signal in the liquid crystal projector,
It is possible to use a normal liquid crystal projector as a liquid crystal projector for fine display.

[0009]

[0010]

Furthermore, the liquid crystal projector of the present invention is capable of fine display.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The optical element rotating device and the liquid crystal display of the present invention will be described below.
Details of the projector will be described according to the illustrated embodiment.

First, a wedge prism rotating device which is an optical element rotating device of the present invention will be described.

Reference numeral 1 in the figure denotes a wedge prism rotating device.

Reference numeral 2 denotes a chassis, on which a wedge prism is rotatably supported, and a drive mechanism for rotating the wedge prism is mounted.

The chassis 2 is formed by integrally forming a front plate 3 having a substantially square front shape and a frame wall 4 protruding rearward from the peripheral edge of the front plate 3 with a metal material.

A large circular opening 5 is formed in the center of the front plate 3. Further, mounting bosses 6, 6, ... Are provided at positions close to the four corners of the rear surface of the front plate 3, and mounting holes 6 are provided in these mounting bosses 6, 6 ,.
a, 6a, ... Are provided in the front-rear direction.

Support bosses 7, 7 are provided on the inner surface of the frame wall 4 at positions facing each other on a horizontal line passing through the central axis of the opening 5. The support bosses 7, 7 are provided with screw holes 7a, 7a extending horizontally.

Reference numeral 8 denotes a wedge prism support frame, which has a substantially annular frame portion and a connecting portion projecting from the upper end of the frame portion. Reference numeral 9 is a substantially annular frame portion, and the frame portion 9
The wedge prism 10 is supported in a fitted shape. The wedge prism 10 is supported by the frame portion 9 in such a direction that the upper end is thickest and the lower end is thinnest.

A connecting part 11 is provided so as to project upward from the upper end of the frame part 9. Reference numeral 12 is a plate-like connecting piece, and the connecting piece 12
Is oriented in the front-rear direction and its lower end is fixed to the connecting portion 11 of the wedge prism support frame 8 by screws 13 and 13.

Pivot shafts 14, 14 having conical tips are projectingly provided from portions located on opposite sides on a horizontal line passing through the center of the frame portion 9.

15 and 15 are pivot bearings and 16 and 16
Is a pivot adjusting screw, one pivot bearing 15 is inserted into the screw hole 7a of the one support boss 7 of the wedge prism support frame 8, and the pivot adjusting screw 16 is screwed to the position of the pivot bearing 15. After the definition, the one pivot shaft 14 of the wedge prism support frame 8 is supported by the pivot bearing 15. Then, the pivot bearing 15 is inserted into the other screw hole 7a, and then the pivot adjusting screw 16 is screwed to support the other pivot shaft 14 on the pivot bearing 15. A compression coil spring 17 is inserted between the pivot bearing 15 and the pivot adjusting screw 16 in the other screw hole 7a, whereby the other pivot bearing 15 is pressed against the other pivot shaft 14, and the wedge prism The support of the support frame 8 is stable.

As described above, the wedge prism 10
Is rotatably supported by the chassis 2.

Reference numeral 18 denotes an upper side portion 4 of the frame wall 4 of the chassis 2.
It is a notch formed in the center on the left and right of a, and the upper end of the connecting piece 12 projects upward through the notch 18. Further, 19 and 19 are screw holes formed at positions close to the left and right ends of the upper side portion 4a.

Reference numeral 20 is a drive mechanism for rotating the wedge prism 10, and a linear motor is used here.

Reference numeral 21 denotes a motor case, which is a rectangular bottom plate 22 which is long in the front-rear direction, a side wall plate 23 which is erected upward from the periphery of the bottom plate 22, and a long side of the bottom plate 22 from the center substantially in the front-rear direction to the side. Mounting pieces 24, 24 projecting inward are integrally formed. Then, the motor case 21 is fixed to the chassis 2 by the screws 25, 25 in which the mounting pieces 24, 24 are screwed into the screw holes 19, 19 formed in the upper side 4a of the frame wall 4 of the chassis 2. To be done.

The bottom plate 22 of the motor case 21 is formed with an opening 26 which is long in the front-rear direction at the center portion in the left-right direction, and the upper end of the connecting piece 12 of the wedge prism support frame 8 extends through the opening 26. It is projected inside.

On the inner surface of the front side portion 23a of the side wall plate 23 of the motor case 21 near one side portion, a stopper protrusion 27 protruding toward the rear side portion 23b is integrally provided. A screw hole 28 is formed in the rear side portion 23b at a position facing the stopper protrusion 27.

A slide base 29 is supported by the motor case 21 so as to be movable in the front-rear direction.

Reference numeral 30 denotes a plate-shaped main portion of the slide base 29, and a supported portion 31 having a prismatic shape extending in the front-rear direction is provided at a position near one side of the lower surface of the main portion 30 so as to project therefrom. The supported portion 3 has a supported hole 3 formed by penetrating it in the front-back direction.
2 is formed. Bearing metals 33, 33 are press-fitted and supported at both front and rear ends of the supported hole 32.

A prismatic connecting portion 34 is provided at a position closer to the other side of the lower surface of the main portion 30, and a notch 35 opening downward is formed at the center of the connecting portion 34 in the front-rear direction. Thus, it is divided into a connection front portion 34a and a connection rear portion 34b with the notch 35 in between.

Reference numeral 36 is a fixing pin, most of which is embedded in the portion of the connecting rear portion 34b on the side of the notch 35, and the tip portion thereof is located in the notch 35. Then, the fixing pin 36
Has a hemispherical tip 36a.

The connecting front portion 34a is formed with a hole 37 penetrating therethrough in the front-rear direction at a position corresponding to the fixing pin 36. The front half portion of the hole 37 is a screw hole 37a, and the rear half portion thereof is slidable. It is a moving hole 37b.

Reference numeral 38 is a slide pin, the tip 38 of which is
a is formed in a hemispherical shape, and the slide pin 38 is slidably supported in the slide hole 37b.

A slide pin adjusting screw 39 is screwed into the screw hole 37a formed in the connecting front portion 34a.

A compression coil spring 40 is inserted between the slide pin 38 and the slide pin adjusting screw 39, whereby the slide pin 38 has its tip 38.
The moving force is urged so that a is pressed against the tip 36a of the fixing pin 36.

Reference numeral 41 denotes a roller shaft projecting from the center in the front-rear direction of the other side surface of the main portion 30, and the roller 42 is rotatably supported by the roller shaft 41.

Reference numeral 43 denotes a coil bobbin fixed to a position near the other side on the upper surface of the main portion 30, and a coil wire is wound around the coil bobbin 43 to form a coil 44.

Reference numeral 45 denotes a round rod-shaped slide shaft, and the front end portion of the slide shaft 45 is press-fitted and supported by the stopper projection 27 and the front side portion 23a of the side wall plate 23.

Reference numeral 46 denotes an adjusting handle, which is formed by integrally forming a cylindrical shaft portion 47 and a knob 48 located at one end of the shaft portion 47, and a thread 49 is provided on the outer peripheral surface of the shaft portion 47. Has been formed. In addition, the central hole 50 of the shaft portion 47 is
7 has an opening at the center of the other end surface 47a.

A shaft portion 47 of the adjusting handle 46 is screwed into a screw hole 28 formed in the motor case 21, and a rear end portion of the slide shaft 45 is inserted into a center hole 50 thereof. The central hole 5 of the shaft portion 47 of the adjustment handle 46
The inner diameter of 0 is formed to be substantially the same as the outer diameter of the rear end of the slide shaft 45 so that the rear end of the slide shaft 45 does not rattle.

Reference numeral 51 is a compression coil spring, which is compressed between the rear end surface of the slide shaft 45 and the back surface of the center hole 50 of the adjusting handle 46.

Thus, the slide base 29 is positioned inside the motor case 21, and the slide shaft 45 is inserted into the supported hole 32, so that the slide base 29 is supported by the motor case 21 so as to be movable in the front-rear direction. . The roller 42 of the slide base 29 is rotatably mounted on the upper surface of the bottom plate 22 of the motor case 21.

Reference numerals 52 and 52 denote anti-vibration pads, which are made of a material having a cushioning function, and are formed on the rear surface 27a of the stopper projection 27 of the motor case 21 and the shaft portion 4 of the adjusting handle 46.
7 is attached to the front end face 47a.

As described above, the wedge prism support frame 8 is attached to the joint portion 53 including the fixed pin 36, the slide pin 38, the slide pin adjusting screw 39, the compression coil spring 40, etc. of the slide base 29 supported by the motor case 21. The connecting piece 12 has a tip 36 of two pins 36, 38.
It is connected in a sandwiched manner between a and 38a.

At the time of this connection, when the upper end of the connecting piece 12 is moved relatively between the fixing pin 36 and the slide pin 38, the upper end of the connecting piece 12 is moved to the tip 3 of the fixing pin 36.
It is located in the gap formed between the peripheral edge of 6a and the peripheral edge of the tip 38a of the slide pin 38, and when the connecting piece 12 is further inserted between the two pins 36, 38, the connecting piece 12 has two pins 36, Since both tip ends 36a, 38a of 38 are further pressed in the direction in which they are separated from each other, the compression coil spring 40 is further compressed and the slide pin 38 retracts, so that the connecting piece 12
The upper end portion of can be inserted between both tips 36a and 38a.

Reference numeral 54 denotes a yoke body made of a magnetic material, which is formed in a rectangular frame shape that is long in the front-rear direction when viewed from above, and is integrally formed with a core portion 55 that extends in the front-rear direction at the center in the left-right direction.

Such a yoke body 54 is fixed to a position near the upper end of the motor case 21, and a core portion 55 thereof is provided.
Is inserted into the coil bobbin 43 of the coil 44.

Reference numerals 56, 56 are magnets fixed to the inner surfaces of the side pieces 57, 57 extending in the front-rear direction of the yoke body 54 and facing the coil 44.

When the coil 44 is energized, a moving force is applied to the coil 44, and the slide base 29 is moved in the direction corresponding to the energizing direction. Therefore, the slide base 29 reciprocates by appropriately switching the energizing direction.

The connecting piece 12 is the linear motor 2
The wedge prism support frame 8 connected to the zero joint portion 53 is tilted according to the movement of the slide base 29. Since the connecting piece 12 is elastically sandwiched by the fixed pin 36 and the slide pin 38, even if the distance between the fixed pin 36 and the slide pin 38 changes due to the tilting thereof. The sandwiched state of the connection piece 12 becomes stable.

Further, in the above linear motor 20,
By adjusting the screwing amount of the adjusting handle 46 into the screw hole 28 of the motor case 21, the position of the tip end surface 47a of the shaft portion 47 can be adjusted to adjust the reciprocating stroke of the slide base 29. Therefore, the tilt angle of the wedge prism support frame 8, that is, the wedge prism 10
It is possible to arbitrarily adjust the tilt angle of the.

Further, since the anti-vibration pad 52 is attached to the rear surface 27a of the stopper projection 27 and the tip surface 47a of the shaft portion 47 of the adjusting handle 46, which defines the moving range of the slide base 29, the slide base 52 is attached. As soon as 29 abuts them, they can stop there.

Furthermore, the slide base 29 is supported by the slide shaft 45, and the roller 4
Since 2 is guided on the bottom plate 22 of the motor case 21, its moving operation is performed smoothly.

Next, the liquid crystal projector 5 according to the present invention.
8 will be described.

Reference numeral 59 denotes a light source section, which includes a reflecting mirror 60, a light bulb 61 arranged at a predetermined position on the reflecting mirror 60, and the reflecting mirror 6.
It is composed of a condensation lens 62 arranged on the front surface of 0, and a parallel light flux is emitted by these.

Reference numeral 63 is a liquid crystal panel arranged in front of the light source unit 59. 64 is a liquid crystal panel drive circuit,
Upon receiving a signal from the video signal processing and synchronous reproduction circuit 65, the liquid crystal panel 63 displays the images of the odd field and the even field alternately by the same pixel in time. The switching between the image display of the odd field and the image display of the even field is performed in synchronization with the vertical synchronizing signal.

Reference numeral 66 denotes a projection lens arranged on the front side of the liquid crystal panel 63, and the light flux transmitted through the liquid crystal panel 63 is projected on the front screen 67 by the projection lens. The projection lens 66 includes a movable lens 68 for fitting with a pin.

The wedge prism rotating device 1 is arranged in front of the projection lens 66.

A control circuit 69 includes a projection lens control circuit and a wedge prism control circuit.

Reference numeral 70 denotes a projection lens control circuit, which includes a position detection circuit 71, a zoom transmission circuit 72, and an automatic pitch adjustment circuit 73. Then, the position detection circuit 71 measures the distance to the screen 67, and based on the measurement result, the movable lens 6 is moved through the automatic pitch adjustment circuit 73.
8 is moved to adjust the focus.

The wedge prism control circuit 74 includes an optical sensor 75, a position detection circuit 76, an optical correction circuit 77, a comparison correction circuit 78, a polarity switching circuit 79, and a drive circuit 80. Then, the position information of the wedge prism 10 is obtained from these, and the tilt angle of the wedge prism 10 is determined by comparing this with the distance information to the screen 67 obtained by the position detection circuit 71. The wedge prism 10 is tilted back and forth while synchronizing the polarity with the vertical synchronizing signal obtained from the processing / synchronization reproducing circuit 65 while switching the polarity between the odd field reproduction and the even field reproduction.

Thus, for example, when reproducing an odd field, as shown in FIG. 11, the wedge prism 10 is rotated counterclockwise to 81,
When the image is projected onto the positions indicated by 81, ... And the even field is reproduced, the wedge prism 10 is rotated clockwise as shown in FIG. The image is projected at the position indicated by. Therefore, it is possible to display a fine image even though the projector uses the liquid crystal panel.

The wedge prism rotating device 1 described above is used.
Can be used by incorporating it into a single liquid crystal projector, but it can also be used in combination with an existing liquid crystal projector, specifically, in the state of being placed in front of the projection lens of the existing liquid crystal projector. It is also possible to use.

[0065]

As is apparent from the above description, the optical element rotating apparatus of the present invention has a width that narrows toward one side in the vertical direction and a horizontal axis orthogonal to the optical axis is used as the rotating axis. a wedge prism which is rotatably supported on the machine frame, and a drive mechanism, so as to reciprocally rotate the wedge prism by the drive mechanism, the drive
The moving mechanism can slide in the optical axis direction with respect to the above machine frame.
And a moving member provided on the moving member.
The fixing pin and the moving member extend approximately in the optical axis direction.
It is inserted into the sliding hole formed so that
The movable pin that is urged toward the fixed pin and the machine frame or the above
A coil fixed to one of the moving members and a coil fixed to the other
And a wedge magnet.
The connecting piece connected to the frame that holds the
And the movable pin.

[0066]

[0067] In addition, the present invention a liquid crystal projector, the above
Optical element rotation device and odd field and even field
Field is displayed in the same pixel and each field is
LCD panel, light source, and projection
And a light source according to the vertical sync signal.
Drives the optical element rotation device to display the image of odd field and even
Above in different directions with respect to the field image
It is aimed at the wedge prism.

[0068]

Therefore, in the optical element rotating apparatus of the present invention, the wedge prism is rotated by the drive mechanism for reciprocally rotating the wedge prism, so that the light transmitted therethrough is desired. It can be shaken vertically in a cycle. Therefore, by incorporating this optical element rotation device in the optical path of the liquid crystal projector, it is possible to perform fine display, and it is arranged as a single unit between the existing liquid crystal projector and the screen to rotate the wedge prism. If the cycle is controlled by the vertical synchronizing signal of the video signal in the liquid crystal projector, a normal liquid crystal projector can be used as a liquid crystal projector for fine display.

[0070]

[0071]

Furthermore, the liquid crystal projector of the present invention enables fine display.

It should be noted that the specific shapes and structures of the respective parts shown in the above-mentioned embodiments are merely examples of the embodiment when the present invention is carried out, and the technical scope of the present invention can be considered by these. Is not limitedly interpreted.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of an optical element rotating device together with FIGS. 2 to 9, and is a front view.

FIG. 2 is a rear view.

FIG. 3 is a side view.

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

5 is a cross-sectional view taken along the line VV of FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a cross-sectional view taken along the line VII-VII of FIG.

FIG. 8 is a perspective view with a part cut away.

FIG. 9 is a perspective view showing an exploded main part.

FIG. 10 is an exploded perspective view showing a linear motor.

FIG. 11 is a diagram showing an outline of a liquid crystal projector when displaying odd-numbered fields.

FIG. 12 is a diagram showing an outline of a liquid crystal projector at the time of displaying even fields.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Wedge prism rotation device (optical element rotation device) 2 Chassis (machine frame) 9 Frame part 10 Wedge prism 12 Connection piece 20 Linear motor (driving mechanism) 29 Slide base (moving member) 36 Fixing pin 37b Sliding hole 38 Slide pin (movable pin) 44 Coil 56 Magnet 58 Liquid crystal projector 59 Light source unit (light source) 63 Liquid crystal panel 66 Projection lens

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02B 26/08 G02F 1/13

Claims (2)

(57) [Claims] 1. A wedge prism rotatably supported by a machine frame about a horizontal axis which becomes narrower toward one side in the vertical direction and which is orthogonal to the optical axis of the wedge prism, and the wedge prism is reciprocally rotated. An optical element rotation device including a drive mechanism for moving the drive mechanism, wherein the drive mechanism slides in the optical axis direction with respect to the machine frame.
A movable member provided so as to be movable, a fixed pin provided on the movable member, and formed so as to extend approximately in the optical axis direction within the movable member.
Is inserted into the sliding hole and facing the fixing pin.
And a coil fixed to one of the machine frame and the moving member.
And a magnet fixed to the other side, and a connection connected to the frame portion holding the wedge prism.
An optical element rotation device , wherein a piece is sandwiched between the fixed pin and the movable pin . 2. The width becomes narrower toward one side in the vertical direction.
And the horizontal axis orthogonal to the optical axis
The wedge prism rotatably supported on the machine frame and the wedge prism
Light with a drive mechanism that reciprocally rotates the wedge prism
In the optical element rotation device, the drive mechanism slides in the optical axis direction with respect to the machine frame.
A movable member provided so as to be movable, a fixed pin provided on the movable member, and formed so as to extend approximately in the optical axis direction within the movable member.
Is inserted into the sliding hole and facing the fixing pin.
And a coil fixed to one of the machine frame and the moving member.
And a magnet fixed to the other side, and a connection connected to the frame portion holding the wedge prism.
A piece was sandwiched between the fixed pin and the movable pin.
Same optical device rotation device and odd field and even field video signals
Displayed in pixels and each field is displayed alternately in time
A liquid crystal panel, a light source, and a projection lens are configured to drive the optical element rotating device according to a vertical synchronization signal,
For odd field and even field images
The wedge prism in different directions.
A liquid crystal projector characterized by that.