JP2002214702A - Position adjustment device for optical modulator - Google Patents

Abstract

(57) Abstract: Provided is a position adjusting device for an optical modulation device that can reduce an occupied space and can accurately adjust the position of the optical modulation device. A reflection device is provided for reflecting a projection light projected from a light source unit via a projection lens toward a screen, and the reflection device is arranged to face the projection lens. The projection distance from the projection lens 160 to the screen 53 via the reflection device 60 is an integral multiple of the distance between the reflection device 60 and the projection lens 160, so that the projection distance can be accurately set, and the position adjustment can be performed. Accuracy can be improved. The projection distance can be easily set according to the model of the optical unit by allowing the reflection device 60 to approach and separate from the projection lens 160.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of light modulating devices, a synthesizing optical system for synthesizing light modulated by these light modulating devices, and an enlarged projection of a light beam synthesized by the synthesizing optical system. The present invention relates to a position adjustment device of a light modulation device that adjusts a position of each light modulation device in order to manufacture a projector including a projection optical system that forms a projection image.

[0002]

2. Description of the Related Art Conventionally, a plurality of light modulators (liquid crystal panels) for modulating a plurality of color lights for each color light according to image information.
And a color synthesizing optical system (cross dichroic prism) for synthesizing the color light modulated by each light modulator, and a projection optical system (projection optical system for enlarging and projecting the light flux synthesized by the color synthesizing optical system to form a projection image. (A lens). As such a projector,
For example, a light beam emitted from a light source is separated into three color lights of RGB by a dichroic mirror, and modulated according to image information for each color light by three liquid crystal panels, and the light beam after the modulation is processed by a cross dichroic prism. There is known a so-called three-plate type projector that synthesizes and enlarges and projects a color image via a projection lens. In such a projector, optical components that constitute an optical system from the light source to the front of the three liquid crystal panels are usually housed in a housing called a light guide. An opening for irradiating light to an image forming area of the liquid crystal panel is provided on a surface of the light guide facing the liquid crystal panel.

In order to obtain a clear projected image with such a projector, in order to prevent the occurrence of a pixel shift between the liquid crystal panels and a shift in the distance from the projection lens, the distance between the liquid crystal panels during the production of the projector must be reduced. The mutual focus / alignment adjustment must be performed with high precision. Here, the focus adjustment refers to an adjustment for accurately arranging each liquid crystal panel at the back focus position of the projection lens, and the alignment adjustment refers to an adjustment for matching pixels of each liquid crystal panel. The same applies to the description. And, conventionally, the focus and
The alignment adjustment is performed for the optical unit including the three liquid crystal panels, the cross dichroic prism, and the projection lens. (1) The luminous flux is incident on the image forming area of each liquid crystal panel, and (2) the cross dichroic prism and the projection (3) imaging the reflected light of the projected image on the screen with a detection device such as a CCD camera fixed at a predetermined position;
The relative position of each liquid crystal panel is adjusted by a position adjusting mechanism while checking the focus, pixel position, etc. of each liquid crystal panel detected by the CD camera. That is, the position of each liquid crystal panel is adjusted based on the position of the image projected on the screen.

Conventionally, an optical unit and a screen are arranged along the optical axis of a projection lens, and the projection light from the optical unit is directly projected on the screen (conventional example 1), or the light passes through a liquid crystal panel and a prism. A reflecting device for reflecting light of the light source along the first direction in a second direction different from the first direction, and a screen for projecting the light of the light source reflected in the second direction by the reflecting device. (Japanese Unexamined Patent Application Publication No. 2000-147654; Conventional Example 2).

[0005]

In the prior art 1, since the optical unit and the screen are arranged in a straight line along the optical axis of the projection lens, there is a disadvantage that a large space is required for the entire apparatus. On the other hand, in the second conventional example, by reflecting the light projected from the projection lens via the mirror by the reflection device, the space occupied by the entire device can be reduced as compared with the first conventional example. Can be played. However, the reflecting device in Conventional Example 2 includes a mirror having a reflecting surface inclined with respect to the optical axis of the projection lens, and the screen on which the light reflected from the mirror is projected is positioned obliquely above the mirror. , The light emitted from the optical axis of the projection lens is refracted and reflected and projected on the screen, and the projection distance from the projection lens to the screen via the reflection device is set accurately. Can not do. Therefore, there is a limit in improving the accuracy of the position adjustment of the liquid crystal panel.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a position adjusting device for an optical modulator that can reduce the occupied space and can adjust the position of the optical modulator with high accuracy.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention provides a reflecting device for reflecting projection light emitted from a projection optical system toward a screen, facing the projection optical system, and
It is an object of the present invention to achieve the above object by making it possible to approach and separate from the projection optical system.

More specifically, a position adjusting device for a light modulator according to the present invention includes a plurality of light modulators, a combining optical system for combining light modulated by each light modulator, and a combining optical system. A position adjustment device of a light modulation device that adjusts a position of the light modulation device, with an optical unit including a projection optical system that forms a projection image by enlarging and projecting the combined light beam, wherein A light source that emits light toward the modulation device, a screen that displays an image projected through the projection optical system, a detection device that detects information of the projection image displayed on the screen, A position adjustment mechanism that adjusts the position of the light modulation device based on the detected information; and a reflection device that reflects projection light projected from the light source via the projection optical system toward the screen. I The reflector is directly facing disposed in the projection optical system, and characterized in that it is movable in the proximity spacing direction relative to the projection optical system.

According to the present invention, since the projection light from the projection optical system is reflected by the reflection device and projected on the screen, the projection light is projected directly on the screen from the projection optical system. The space occupied by the device itself can be reduced. In addition, since the reflection device is directly opposed to the projection optical system, the projection distance from the projection optical system to the screen via the reflection device can be set accurately, and the accuracy of position adjustment can be improved. In addition, the projection distance can be easily set according to the model of the optical unit by allowing the reflection device to be able to approach and separate from the projection optical system.

Here, in the position adjusting device having the above-described configuration, the light source irradiates a plurality of lights toward each of the light modulation devices, and the reflection device adjusts the position of the projection light to be irradiated. A configuration having a plurality of mirrors arranged in the same plane is preferable. With this configuration, when light is emitted from the light source to the corner of the light modulation device, the plurality of lights emitted from the light source are each reflected by the mirror and are reliably projected on the screen. Adjustments can be made accurately. In addition, since one mirror is provided instead of one mirror, it is not necessary to prepare a large mirror. Therefore, the structure of the mirror itself can be reduced in size.

Further, in the present invention, it is preferable that the reflecting device includes a plurality of sets each having a reflecting surface, and the reflecting surfaces of each set are arranged to face each other. In this configuration, by providing a plurality of sets of reflecting devices, the number of reflections is increased, thereby shortening the projection distance set between the projection optical system and the reflecting devices, thereby saving the space of the device. Can be achieved.

[0012] It is preferable that the detecting device detects information of a projected image displayed on the front of the screen from the back of the screen. In this configuration, since the projection light reflected by the reflection device is not blocked by the detection device, the projection light is reliably projected on the screen. Therefore, the information of the projection image displayed on the screen can be accurately detected by the detection device, and the accurate position adjustment of the light modulation device can be performed.

Further, an adjusting section main body is provided with the light source and the position adjusting mechanism, and a projection section main body is provided with the screen, the detecting device and the reflecting device. A laser position locating device for directly arranging the laser beam irradiating device, the laser position locating device is provided in the adjusting section main body, and irradiates a laser beam toward the reflecting device, and the reflecting device. It is preferable to include a laser light detection device that detects the laser light reflected by the laser beam detector, and a determination device that determines the attitude of the reflection device based on the detection by the laser light detection device. In this configuration, the entire apparatus is divided into the adjustment unit main body and the projection unit main body, so that transportation and storage are facilitated. Even when the entire apparatus is divided in this manner, when combining them, accurate positioning can be performed by the laser positioning apparatus, so that the accuracy of the position adjustment of the light modulation apparatus does not decrease.

[0014] The position adjusting mechanism may determine a back focus position of the projection optical system to be adjusted and a position of the position adjusting mechanism according to the light modulator and the combining optical system for each model of the optical unit. A configuration having a control device for storing the information in the memory is preferable. In this configuration, the back focus position of the projection optical system and the position of the light modulation device according to the light modulation device and the combining optical system are stored in advance by the control device according to the model of the optical unit, and the optical unit At the time of mounting, these positions are called from the control device. Therefore, it is not necessary to perform a positioning operation according to the model of the optical unit only by setting the center position of the combining optical system or the projection optical system. Therefore, even if the entire apparatus is downsized, the position of these optical systems can be easily adjusted.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. (1) Structure of Projector Using Lens Array FIG. 1 shows a plurality of light modulation devices, a color synthesis optical system, and a plurality of light modulation devices to be adjusted by a position adjustment device of the light modulation device according to the embodiment of the present invention. 1 shows a structure of a projector 100 employing an optical unit including a projection optical system. The projector 100 includes an integrator illumination optical system 11
0, a color separation optical system 120, a relay optical system 130, an electro-optical device 140, a cross dichroic prism 150 as a color combining optical system, and a projection lens 160 as a projection optical system.

The integrator illumination optical system 110 includes:
A light source device 111 including a light source lamp 111A and a reflector 111B; a first lens array 113; a second lens array 115; a reflecting mirror 117;
19 is provided. The luminous flux emitted from the light source lamp 111A is made uniform in the emission direction by the reflector 111B, is divided into a plurality of partial luminous fluxes by the first lens array 113, and the emission direction is changed to 90 by the reflection mirror 117.
After being bent, an image is formed near the second lens array 115. Each of the partial light beams emitted from the second lens array 115 has a central axis (principal ray),
A plurality of partial luminous fluxes that are incident perpendicularly to the incident surface of the liquid crystal panel 19 and are emitted from the superimposing lens 119 are used to form three liquid crystal panels 141 constituting an electro-optical device 140 described later.
R, 141G, and 141B.

The color separation optical system 120 includes two dichroic mirrors 121 and 122 and a reflection mirror 123, and a plurality of partial light beams emitted from the integrator illumination optical system 110 by these mirrors 121, 122 and 123. Has a function of separating light into three color lights of red, green and blue. The relay optical system 130 includes the incident-side lens 1
31, a relay lens 133, and a reflection mirror 135;
137, and has a function of guiding the color light separated by the color separation optical system 120, for example, blue light B, to the liquid crystal panel 141B. The electro-optical device 140 includes liquid crystal panels 141R, 141G, and 141 serving as three light modulation devices.
B using, for example, a polysilicon TFT as a switching element. Each of the color lights separated by the color separation optical system 120 is subjected to image information by these three liquid crystal panels 141R, 141G, and 141B. To form an optical image.

The cross dichroic prism 150 serving as the color synthesizing optical system includes the three liquid crystal panels 141.
A color image is formed by combining images modulated for each color light emitted from R, 141G, and 141B. In the cross dichroic prism 150, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in an approximately X shape along the interface of the four right-angle prisms. The three colored lights are combined by the dielectric multilayer film. Then, the color image synthesized by the cross dichroic prism 150 is output to the projection lens 160.
And projected on a screen.

(2) Structure of Optical Unit to be Adjusted In such a projector 100, the electro-optical device 140, the cross dichroic prism 150, and the projection lens 160 are integrated as an optical unit. That is, as shown in FIG.
No. 0 is provided with a head body 171 which is a side surface L-shaped structure made of a magnesium alloy. The projection lens 160 is fixed to the outside of the L-shaped vertical surface of the head body 171 by a screw. The cross dichroic prism 150 is similarly fixed by screws on the upper side of the L-shaped horizontal surface of the head body 171.

The three liquid crystal panels 141 R, 141 G, 141 B constituting the electro-optical device 140 are arranged so as to surround three sides of the cross dichroic prism 150. Specifically, as shown in FIG.
The holes 41R, 141G, and 141B are housed in the holding frame 143, and the holes 14 formed in the four corners of the holding frame 143.
By inserting a transparent resin pin 145 into the 3A together with an ultraviolet curable adhesive, the pin 145 is fixed to the cross dichroic prism 150 by a so-called POP (Panel On Prism) structure, which is bonded and fixed to the light beam incident end surface 151 of the cross dichroic prism 150. Have been. here,
A rectangular opening 143B is formed in the holding frame 143, and each of the liquid crystal panels 141R, 141G, 141B is exposed through the opening 143B, and this portion becomes an image forming area. That is, each liquid crystal panel 141R, 141G, 1
Each color light R, G, B is introduced into this portion of 41B, and an optical image is formed according to image information.

In the optical unit 170 employing the POP structure, the liquid crystal panels 141R, 141G,
When the liquid crystal panels 141R, 141G, 141 are attached and fixed to the cross dichroic prism 150,
Since the focus adjustment, alignment adjustment, and fixing of B must be performed at the same time (within about 8 minutes), the assembly is usually performed in the following procedure.

1) The projection lens 160 and the cross dichroic prism 150 are attached and fixed to the head body 171. 2) A first liquid crystal panel, for example, a liquid crystal panel 141G is bonded and fixed to the cross dichroic prism 150. Specifically, first, a pin 145 having a tip coated with an ultraviolet curable adhesive is inserted into a hole 143A of the holding frame 143 of the liquid crystal panel 141G. 3) Next, the tip portion of the pin 145 is brought into contact with the light incident surface 151 of the cross dichroic prism 150. 4) In this state, a light beam is introduced into the image forming area of the liquid crystal panel 141G, and while checking the projected image displayed on the projection surface via the projection lens 160, the advancing / retreating position with respect to the light beam incident end surface 151, the plane position, and the like. Adjust the rotation position,
The focus and alignment of the liquid crystal panel 141G are adjusted.

5) When proper focus and alignment are obtained, ultraviolet rays are irradiated from the base end of the pin 145 to completely cure the ultraviolet curable adhesive. 6) The other liquid crystal panels 141R and 141B are also adhered and fixed in the same manner as described above, but in adjustment, the pixel positions of the image forming area of the liquid crystal panel 141G already fixed are taken into consideration.
That is, the plane position with respect to the light beam incident end face 151 and the rotational position with respect to the light beam incident end face 151 are adjusted with reference to the pixel position of the liquid crystal panel 141G that has already been fixed. Therefore, when assembling the optical unit 170 employing such a POP structure, each of the liquid crystal panels 141R,
A position adjusting device that adjusts the focus and alignment between 41G and 141B is required.

(3) Structure of Position Adjusting Device of Light Modulating Device FIGS. 4 and 5 show a position adjusting device 2 for adjusting the focus and alignment between the liquid crystal panels 141R, 141G and 141B of the optical unit 170. It is shown. The position adjustment device 2 includes an adjustment unit main body 30 and a projection unit main body 40. The adjustment unit main body 30 includes a light source unit 37 (see FIG. 6) as a light source, three six-axis position adjustment units 31 serving as position adjustment mechanisms, and a UV light shielding cover 20A. The UV light shielding cover 20 </ b> A is a side plate 21 surrounding the six-axis position adjustment unit 31.
, A bottom plate 22, a door 24 provided on the side plate 21 so as to be openable and closable, and a mounting table 25 provided at a lower portion. The side plate 21 is provided with a transmission window 21A for transmitting light emitted from the light source unit 37 and transmitted through the projection lens 160 to the projection unit main body 40.

The door 24 is provided when the POP adjustment work is supplied and removed, and when the six-axis position adjustment unit 31 is adjusted, and is made of an acrylic plate that does not transmit ultraviolet rays. The mounting table 25 is provided with a caster 25A at a lower portion thereof so that the adjusting section main body 30 can be easily moved when the apparatus is installed. The projection unit body 40 includes a screen unit 50, a reflection device 60,
And a dark room 20B. The dark room 20B is
It comprises a side plate 21, a bottom plate 22 and a top plate 23 surrounding the screen unit 50 and the reflection device 60, and a mounting table 25. The side plate 21 is provided with a transmission window 21A for transmitting light emitted from the light source unit 37 via the optical unit 170.

(3-1) Structure of Adjusting Unit Main Body The inside of the UV light shielding cover 20A of the adjusting unit main body 30 includes
A shaft position adjusting unit 31 and a clamp jig 33 for supporting and fixing the optical unit 170 to be adjusted are provided. Although not shown in FIG. 4, a computer 70 (described later), which is a control device for controlling the adjustment unit main body 30, the screen unit 50 and the reflection device 60, and an optical unit to be adjusted are provided below the mounting table 25. When performing the adjustment work of 170, the adjustment light source device for introducing the adjustment light source and the liquid crystal panels 141R, 141G, 141B of the optical unit 170 by curing the ultraviolet curing adhesive.
Is mounted on the cross dichroic prism 150.

The six-axis position adjusting unit 31 adjusts the positions of the liquid crystal panels 141R, 141G, and 141B with respect to the light incident surface 151 of the cross dichroic prism 150. As shown in FIG. 6, the six-axis position adjustment unit 31 includes a plane position adjustment unit 311 that is movably installed along the rail 351 of the bottom plate 22 of the UV light shielding cover 20A, and a tip of the plane position adjustment unit 311. In-plane rotation position adjustment section 313 provided at the portion, out-of-plane rotation position adjustment section 315 provided at the tip of this in-plane rotation position adjustment section 313, and out-of-plane rotation position adjustment section 3
And a liquid crystal panel holding portion 317 provided at the front end of the liquid crystal panel.

The plane position adjuster 311 adjusts the forward / backward position and the plane position of the cross dichroic prism 150 with respect to the light-incident end surface 151, and the mounting table 2
5, a base 311A slidably provided on the base 5, a leg 311B standing upright on the base 311A, and a leg 31
1B, an in-plane rotational position adjusting unit 3
13 is connected. Base 3
Reference numeral 11A moves the mounting table 25 in the Z-axis direction (the horizontal direction in FIG. 6) by a driving mechanism such as a motor (not shown). The leg 311B is moved in the X-axis direction (a direction perpendicular to the plane of FIG. 6) with respect to the base 311A by a driving mechanism (not shown) such as a motor provided on the side. Connection part 311C
Is driven by a driving mechanism such as a motor (not shown).
It moves in the Y-axis direction (vertical direction in FIG. 6) with respect to 11B.

The in-plane rotational position adjustment unit 313 is a unit that adjusts the in-plane rotational positions of the liquid crystal panels 141R, 141G, and 141B with respect to the light beam incident end surface 151 of the cross dichroic prism 150.
The base 313A includes a cylindrical base 313A fixed to the distal end of the first base 313, and a rotation adjuster 313B rotatably provided in a circumferential direction of the base 313A. Then, by adjusting the rotation position of the rotation adjusting unit 313B, the liquid crystal panels 141R, 141G, 14G with respect to the light beam incident end face 151 are adjusted.
The in-plane rotational position of 1B can be adjusted with high accuracy.

The out-of-plane rotation position adjustment unit 315 is a part that adjusts the out-of-plane rotation position of the liquid crystal panels 141R, 141G, and 141B with respect to the light beam incident end surface 151 of the cross dichroic prism 150. The out-of-plane rotational position adjusting section 315 is fixed to the distal end portion of the in-plane rotational position adjusting section 313, and has a base 315A formed at the distal end with a concave curved surface that forms an arc in the horizontal direction.
5A is provided so as to be slidable along a circular arc on the concave curved surface of 5A.
An adjusting portion 315B and a second adjusting portion 315 provided slidably along a circular arc on a concave curved surface of the first adjusting portion 315B.
C. When the motor (not shown) provided on the side of the base 315A is rotationally driven, the first adjustment unit 315B slides, and when the motor (not shown) provided on the first adjustment unit 315 is rotated, the second adjustment is performed. Part 315C
Slides on the liquid crystal panel 14 with respect to the light-incident end face 151.
The rotational positions of the 1R, 141G, 141B in the out-of-plane direction can be adjusted with high precision.

The liquid crystal panel holding portion 317 is a portion for holding the liquid crystal panels 141R, 141G, 141B to be adjusted. The liquid crystal panel holding portion 317 includes a fixed holding piece 317A fixed to the tip of the second adjusting portion 315C, 2 A movable holding piece 317B slidably provided at the tip of the adjusting section 315C.
And the actuator 3 for operating the movable holding piece 317B
17C. And the actuator 317
By operating the movable holding piece 317B with C, the liquid crystal panels 141R, 141G, and 141B can be held. Further, by changing the initial slide position of the movable holding piece 317B, it is possible to hold the liquid crystal panels 141R, 141G, and 141B having different sizes.

The light source unit 37 is arranged between the fixed holding piece 317A and the movable holding piece 317B of the liquid crystal panel holding portion 317. This light source unit 3
Reference numeral 7 denotes a unit light source for supplying the adjustment light source light and the fixing light source light to the liquid crystal panels 141R, 141G, and 141B, and a unit body 371 contacting the liquid crystal panels 141R, 141G, and 141B, and a light source light for the unit body 371. And four optical fibers 372 for supplying the light.

The distal end of the optical fiber 372 is connected to an adjusting light source device and a fixing light source device installed below the mounting table 25. Liquid crystal panel 1 of unit body 371
The contact surfaces with 41R, 141G and 141B are shown in FIG.
As shown in (A), the liquid crystal panels 141R, 141G,
An adjustment light source 371A set according to the corner of the rectangular image forming area 141B and a fixing light source 371A arranged outside the image forming area and in contact with the base end of the transparent resin pin 145. And a light source unit 371B. Note that the unit main body 371 which is in contact with the liquid crystal panels 141R, 141G, and 141B is, as shown in FIG. 7A, an adjustment light source unit 371 as shown in FIG. 7B.
The liquid crystal panel 141 includes one in which the fixing light source 371C is arranged along the outer side of A, and one in which the arrangement of the fixing light source 371B is different as shown in FIG.
By properly using these unit bodies 371 according to the types of R, 141G, and 141B, liquid crystal panels having different fixed structures can be handled.

The clamp jig 33 is shown in FIGS.
As shown in the figure, a substrate 331 installed on the bottom plate 22;
A plurality of legs 333 erected on the substrate 331;
There is provided a set plate 335 provided on the upper part of the leg 333 and to which the optical unit 170 to be adjusted is attached. The set plate 335 includes a mounting portion 339 that supports the head body 171, a lens support portion 341 that supports the projection lens 160, and an ND holder 34 for arranging an ND filter that reduces the amount of light emitted from the projection lens 160.
3, a clamp lever 345 for holding and fixing the optical unit 170 installed on the mounting portion 339, and the flutter cutter 3 disposed between the projection lens 160 and the opening window.
47, and the center of the optical unit 170 can be positioned and fixed.

As shown in FIG. 8, the flare cutter 347 is provided at a tip end of a rod 349 rotatably provided on a rising portion 348 provided upright at an end of the set plate 335. Rotate the flare cutter 347
Is disposed immediately before the projection lens 160, the flare light of the light beam emitted from the projection lens 160 is regulated, and a clear image can be projected on the screen unit 50. The ND holder is provided so as to hold an ND filter for adjusting the amount of light and adjust the amount of light, since the amount of emitted light varies depending on the manufacturing model. When the optical unit 170 to be adjusted is installed, the optical unit 170 is installed on the mounting section 339 and the projection lens 160 is attached to the lens support section 3.
After making contact with the head 41, the clamp lever 345 is rotated, and the head body 171 of the optical unit 170 is held and fixed.

Here, for each model of the optical unit 170,
Six-axis position adjustment unit 3 according to the back focus position of optical unit 170, liquid crystal panels 141R, 141G, 141B and cross dichroic prism 150
Although the position 1 is different, in the present embodiment, the back focus position and the position of the 6-axis position adjustment unit 31 are stored in the computer 70 for each model of the optical unit 170, and the optical unit 170 is installed. At this time, these position adjustments are called from the computer 70 and performed.

(3-2) Structure of Projection Unit Main Body In FIG. 4, the screen unit 50 and the reflection device 60 constituting the projection unit main body 40 are arranged to face each other inside the dark room 20B. The screen unit 50 is
A transmissive screen 53 that is disposed on the 6-axis position adjustment unit 31 side of the dark room 20B and is disposed on the upper surface of the bottom plate 22 of the dark room 20B and serves as a projection surface of the optical unit 170 to be adjusted. A CCD camera 55 serving as a detection device installed on the back surface;
A moving mechanism 57 for moving the camera 55 along the surface of the transmissive screen 53. Transmission screen 5
3, a transmission window 53A for transmitting light emitted from the light source unit 37 via the optical unit 170 is provided.

As shown in FIG. 10, the transmission screen 53 includes a rectangular frame 531 provided around the screen 5 and a screen body 5 provided inside the frame 531.
33 are provided. The screen body 533 is, for example,
The optical beads can be uniformly dispersed and arranged on the opaque resin layer. When a light beam enters from the side where the optical beads are arranged, the optical beads become a lens, and the light beam is formed on the back side of the screen main body 533. It is designed to inject into.

The CCD camera 55 as a detection device is an area sensor using a charge coupled device as an image pickup device, detects a projected image formed on the back side of the screen main body 533, and outputs it as an electric signal. Output. In the present embodiment, the CCD camera 55
Are arranged via a moving mechanism 57 near four corners of a rectangular projection image displayed on the transmission screen 53. The CCD camera 55 is provided with a zoom / focus mechanism in order to detect a projection image with high accuracy, and can freely adjust the zoom / focus by remote control.

The moving mechanism 57 includes a base 571 provided in the vicinity of the four corners of the frame 531 and four shafts slidably provided in the X-axis direction (left and right directions in FIG. 10) with respect to the base 571. The member 573 and each shaft member 573 have Y
The camera includes four camera mounting portions 575 that are slidably mounted in the axial direction (the vertical direction in FIG. 10) and to which the CCD camera 55 is mounted. And each camera mounting part 5
Reference numeral 75 moves in the X-axis direction and the Y-axis direction by a servo control mechanism inside the mounting table 51.

Referring to FIGS. 4 and 5, a reflecting device 60 is shown.
Is for reflecting the projection light projected from the light source unit 37 via the projection lens 160 toward the transmissive screen 53, and includes a reflector body 61 directly opposed to the projection lens 160, and a reflector body 61. Moving mechanism 6 for moving the lens in the direction of approaching and separating from the projection lens 160
And 2. The reflecting portion main body 61 supports four mirrors 63 arranged in the same plane according to the position of the projection light to be irradiated, a mounting plate 64 to which these mirrors 63 are mounted, and a lower portion of the mounting plate 64. Support plate 65
It is comprised including. These mirrors 63 are formed such that their reflection surfaces 63A are orthogonal to the optical axis of the projection light emitted from the projection lens 160. The reflecting portion moving mechanism 62 is provided on the bottom plate 22 of the dark room 20B so as to extend in a direction orthogonal to the plane of the transmissive screen 53, a plurality of rails 66, and is rotatable on these rails 66. The provided wheel 67 and the wheel 67
And a drive mechanism (not shown) for rotationally driving the motor.

(4) Positioning of Adjustment Unit Main Body and Projection Unit Main Body In order to arrange the adjustment unit main body 30 and the projection unit main body facing each other, a laser positioning device 80 shown in FIG. 11 is used. The laser positioning device 80 is provided on the clamp jig 33 of the adjustment unit main body 30, and has a structure in which a casing 81 is provided with a laser light irradiation device 82, a laser light detection device 83, and a determination device 84. .

The laser beam irradiation device 82 is a laser oscillator that irradiates the mirror 63 of the reflection device 60 with laser light. The laser light detection device 83 is a laser light irradiation device 82
Transmits the laser beam emitted from the
Is a half mirror that reflects the laser light reflected by the device toward the determination device 84 in order to detect the laser light. Judgment device 84
Is provided on the upper part of the casing 81, and the configuration is shown in FIG.

In FIG. 12, the judgment device 84 is a window 8 to which the laser beam reflected from the laser detection device 83 is irradiated.
4A, and the window 84A has a laser beam irradiation device 82
A center point 84B is displayed which indicates a position where the laser light emitted from the laser light and the laser light reflected by the mirror 63 match. Thus, the attitude of the reflecting device 60 having the mirror 63 is determined. Mirror 63 is laser positioning device 8
0, the window 84A of the determination device 84
, The point 84C of the laser beam reflected by the mirror 63 is displayed away from the center point 84B. The mirror 63 is adjusted so that the point 84C reflected by the mirror coincides with the center point 84B.
Is changed.

(5) Adjustment operation by position adjustment device The adjustment unit main body 30, the screen unit 50 and the reflection device 60 described above, as shown in the block diagram of FIG.
It is electrically connected to a computer 70 as a control device. The computer 70 includes a CPU and a storage device, controls the operation of the servo mechanism of the adjustment unit main body 30, the screen unit 50, and the reflection device 60, and also performs image processing of a projection image captured by the CCD camera 55.

A program called by the computer 70 displays a display screen 71 shown in FIG. 14 on a display, and performs focus and alignment adjustment based on various information displayed on the display screen 71. The display screen 71 includes a screen display view 72 for directly displaying an image from the CCD camera 55 and a
An image processing view 73 for performing image processing of the video signal from the CPU, and an axis movement amount display view 74 for displaying each axis adjustment amount of the six-axis position adjustment unit 31 as a result of the image processing.

For the focus and alignment adjustment of the optical unit 170 to be adjusted, a model registration operation for setting an adjustment condition according to the model of the optical unit 170 and an actual adjustment operation are performed by calling up the registered adjustment conditions. Adjustment operation. Hereinafter, the model registration operation and the adjustment operation will be described in detail. (5-1) Model registration operation The model registration operation uses a sample of the optical unit 170 whose focus position and alignment position have been adjusted in advance,
It is executed according to the flowchart of FIG.

1) First, the model data set in the program developed on the computer 70 is cleared (process S11), and a state is established in which new model data can be registered. 2) Next, the user inputs image processing settings according to the program (process S12). Specifically, the setting of the distance between the CCD cameras 55 is input. The distance between the CCD cameras 55 is set by calculation in consideration of where the four corners of the image forming areas of the liquid crystal panels 141R, 141G, and 141B are reflected on the transmission screen 53. 3) When the input of the image processing setting is completed, a file name to be used as model data is designated, and the designated distance is saved as model data in the storage device with the file name (process S13).

4) After saving the model data, the CCD
The reference position of the camera 55 is set (process S14). CC
The reference position of the D camera 55 is set by a teaching operation. When a teaching operation is selected from among the programs, a crosshair as a reference of the position of the CCD camera 55 is displayed on the screen display view 72. The CCD camera 55 is moved by the moving mechanism 57 while watching the crosshairs,
The CCD camera 55 is arranged at a desired position. The reference position is an image projected from the projection lens 160 to the screen 53 when the projection lens 160 having no deviation of the optical axis from the liquid crystal panel 141G is located at a normal position (an image normally projected). Is a position where an image can be taken.

5) When the reference position setting of the CCD camera 55 is completed, the model number of the optical unit 170 and the position of the CCD camera 55 at this model number are registered as model data in the above file (process S15). 6) The adjustment start position of the six-axis position adjustment unit 31 for adjusting the position of the liquid crystal panel 141G is registered in the above file. This position corresponds to the liquid crystal panel 141 in the product design.
The position of the center of the G image forming area is set (process S16). 7) The size of one pixel of the CCD camera 55 is set (step S17) and registered in the above file (step S1).
8).

8) Finally, an alignment reference pattern is registered (step S19). Specifically, as shown in FIG. 16, a substantially square region in which the ratio of the sides of the pixel portion G1 and the portion G2 other than the pixel is approximately 2: 1 (area ratio 4: 5) is defined as the reference pattern BP. The shape of the pattern BP and the arrangement position on the projection image area are registered. Note that this reference pattern BP corresponds to each of the liquid crystal panels 141R, 141G, 14G.
It is necessary to set corresponding to the four corners of 1B.
Two (4 × 3) reference patterns and 12 (4 × 3) retry patterns are registered. 9) When the registration of all reference patterns is completed, these data are formally registered in the above file as model data (process S20).

(5-2) Adjustment Operation 1) First, after selecting the clamp jig 33 according to the model of the optical unit 170 to be adjusted, the optical unit 170 is fixed to the clamp jig 33, and the clamp jig is clamped. The jig 33 is set at a predetermined position on the mounting table 25. 2) On the program developed on the computer 70, the model data corresponding to the optical unit 170 to be adjusted is called from the model data registered by the previous model registration operation. 3) When the model data is called on the program, the liquid crystal panel 141G located opposite to the projection lens 160 and the cross dichroic prism 150 is used to
The arrangement position of the D camera 55 is corrected. This work is shown in FIG.
According to the flowchart.

3-1) First, the CCD registered in the model data
The arrangement position of the camera 55 is output from the computer 70,
The moving mechanism 57 is moved by a servo mechanism inside the mounting table 52. The CCD camera 55 is moved along the surface of the screen 53 by the moving mechanism 57 and set at the reference position (step S231). 3-2) The liquid crystal panel 141G is moved in a plane parallel to the screen 53 (Step S232). This liquid crystal panel 14
1G movement means that the image projected on the screen 53 is CC
The process is performed until the reference position of the D camera 55 is matched (step S233).

3-3) Next, the amount of movement of the CCD camera 55 is calculated from the amount of movement D measured in step S233 (step S234). The amount of movement is the distance between the liquid crystal panel 141G and the projection lens 160, and the distance between the projection lens 160 and the screen 53.
Is obtained by multiplying the ratio of the distance to the distance by the movement amount. 3-4) Thereafter, the CCD camera 55 is moved along the screen 53 (Step S235). 3-5) Further, the liquid crystal panel 141G is returned to the adjustment start position registered in the processing S16 shown in FIG. 15 (processing S
236). As a result, there is no shift between the position of the image forming area of the liquid crystal panel 141G and the position of the opening of the light guide LG. 3-6) After the above work is completed, 6-axis position adjustment unit 3
The actual focus and alignment adjustment by 1 is started.

(6) Effects of the Embodiment According to the present embodiment, the following effects can be obtained. That is, the liquid crystal panels 141R, 141G, 141
A light source unit 37 for irradiating light toward B, a screen 53 for displaying an image projected via the projection lens 160, a CCD camera 55 for detecting information of the projected image displayed on the screen 53, CCD camera 5
5 based on the information detected by the liquid crystal panel 141.
A six-axis position adjustment unit 31 for adjusting the positions of R, 141G, and 141B;
Since the position adjusting device 2 includes the reflection device 60 that reflects the projection light projected through the screen 53 toward the screen 53, the projection light from the projection lens 160 is reflected by the reflection device 60 and the screen 53. Therefore, the space occupied by the device itself can be reduced as compared with the case where the projection light is directly projected onto the screen 53 from the projection lens 160.

Further, the reflecting device 60 is connected to the projection lens 160.
, The projection lens 160 and the reflection device 6
The projection distance to the screen 53 via 0 is approximately twice the distance between the reflection device 60 and the projection lens 160. Therefore, the projection distance can be set accurately,
The accuracy of position adjustment can be improved. In addition, by making the reflection device 60 capable of approaching and separating from the projection lens 160 (servo drive), the projection distance can be easily set according to the model of the optical unit 170.

The light source unit 37 is provided for each liquid crystal panel 141.
R, 141G, and 141B are provided with four optical fibers 372 that irradiate light toward the light source, and the reflecting device 60 is disposed in the same plane according to the position of the projection light emitted from the four optical fibers 372. Of the liquid crystal panels 141R, 141G, 141B.
By irradiating the light from the light source unit 37 to the corners of the liquid crystal panel, the four lights emitted from the light source unit 37 are reflected by the mirrors 63 and are reliably projected on the screen 53. 141R, 141G, 14
1B position adjustment can be performed accurately. Moreover, since the mirror 63 is divided into four mirrors, it is not necessary to prepare a large mirror having a high surface accuracy, so that the structure of the mirror itself can be reduced in size and cost can be reduced. be able to.

Also, a CCD camera 55 as a detecting device
Is configured to detect the information of the projected image displayed on the transmissive screen 53 from the rear side, so that the projection light reflected by the reflecting device 60 is not blocked by the CCD camera 55, so that the screen Is projected. Therefore, the information of the projected image displayed on the screen 53 can be accurately detected by the CCD camera 55, and accurate position adjustment of the liquid crystal panels 141R, 141G, 141B can be performed.

Further, the adjusting section main body 30 is provided with the light source unit 37 and the 6-axis position adjusting unit 31, and the projection section main body 40 is provided with the transmission screen 53, the CCD camera 55 and the reflecting device 60. Since the entire apparatus is divided into the adjustment section main body 30 and the projection section main body 40, transportation and storage of the apparatus are facilitated. In the present embodiment, even when the entire apparatus is divided into two, when these are combined, accurate positioning can be performed by the laser positioning apparatus 80, so that the accuracy of the position adjustment does not decrease. The laser positioning device 80 includes a laser light irradiating device 82 provided on the adjustment unit main body 30 and irradiating the reflecting device 60 with laser light, a laser light detecting device 83 for detecting the laser light reflected by the reflecting device 60, Since the determination device 84 for determining the attitude of the reflection device 60 based on the detection by the laser light detection device 83 is provided, the structure of the device itself can be simplified.

The back focus position of the projection lens 160 to be adjusted and the liquid crystal panels 141R, 141G, 14
1B and the position of the six-axis position adjustment unit 31 corresponding to the cross dichroic prism 150
Since a computer 70 is provided for storing data for each model 0,
Cross dichroic prism 150 and projection lens 16
It is not necessary to perform these positioning operations only by setting the center position of 0. Therefore, even if the entire apparatus is downsized, the position of these optical systems can be easily adjusted.

(7) Modifications of the Embodiment The present invention is not limited to the above-described embodiment, but includes the following modifications. For example, in the present invention, as shown in FIGS.
The reflecting device 60 includes a plurality of sets each having a reflecting surface 63A,
For example, three sets may be provided, and the reflecting surfaces 63A of each set may be arranged to face each other. That is, a reflecting device that reflects light from the projection lens 160 is a first set of reflecting devices 60, and a second set of reflecting devices 60 that reflects light reflected by the reflecting device 60 is provided on the transmission screen 53, A structure in which a third set of reflecting devices 60 that reflect light reflected by the second set of reflecting devices 60 may be provided in the first set of reflecting devices 60 may be used. The first set of reflecting devices 60 and the third set of reflecting devices 60 have mirrors 63 mounted at different positions on the mounting plate 64, respectively, and the reflecting surfaces 63A of the first set and the third set of reflecting devices 60 The reflection surfaces 63A of the second set of reflection devices 60 face each other. In this configuration, by providing a plurality of sets of the reflecting devices 60, the number of reflections is increased, thereby shortening the projection distance set between the projection lens 160 system and the reflecting device 60, and saving the space of the device. Can be achieved more.

In the present invention, as shown in FIG. 20, the transmission screen may have a curved shape.
In FIG. 20, the transmission screen 153 has a curved structure with a central portion protruding. The transmission screen 153 is provided with a mirror 163 of the second set of reflection devices 60, and the mounting plate 64 is provided with a first mirror 163. Mirror 6 of set of reflectors 60
3 and a mirror 163 of the third set of reflecting devices 60 are provided. Here, the mirrors 163 constituting the second and third sets of the reflecting devices 60 are formed in a substantially trapezoidal plane, unlike the mirrors 163 formed in a flat plate shape. With this structure, it is possible to reduce the size of the device in the direction facing the projection optical axis. If the surface of the transmission screen 153 has a hemispherical shape, the size in the vertical direction can be reduced.

Further, in the above-described embodiment, the object to be adjusted is the optical unit 170 used for the projector using the transmissive liquid crystal panel. However, the present invention is not limited to this. Can also be applied. Also, the number of panels is not limited to three, but may be any number as long as it is plural. Depending on the number of panels, some panels may simply modulate the intensity of light (modulate light that is not colored light). Furthermore, the optical system that synthesizes light modulated by multiple panels does not have an optical element that synthesizes color light such as a cross dichroic prism, but uses an optical system that synthesizes color-independent light such as a polarizing beam splitter. In some cases, it is configured.

As described above, the present invention can be applied to a light modulator that modulates non-color light and a projector using a combining optical system other than the color light combining optical system.
Further, the light modulator is not limited to the liquid crystal panel, and may be a light modulator using a plasma element or a micro mirror. That is, the position adjustment device 2 and the series of work procedures described above can be applied to various projectors having a plurality of light modulation devices. In addition, the specific structure, shape, and the like of the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0065]

As described above, according to the position adjusting device of the light modulator of the present invention, the occupied space can be reduced and the position of the light modulator can be adjusted with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a structure of a projector including an optical unit to be adjusted by a position adjustment device of a light modulation device according to an embodiment of the present invention.

FIG. 2 is an external perspective view illustrating a structure of an optical unit to be adjusted in the embodiment.

FIG. 3 is an exploded perspective view illustrating a structure of an optical unit to be adjusted in the embodiment.

FIG. 4 is a side view illustrating a structure of a position adjusting device of the light modulation device in the embodiment.

FIG. 5 is a plan view illustrating a structure of a position adjusting device of the light modulation device in the embodiment.

FIG. 6 is a side view illustrating a structure of a position adjustment mechanism that constitutes an adjustment device main body according to the embodiment.

FIG. 7 is a front view illustrating a light source arrangement of the light source unit in the embodiment.

FIG. 8 is an external perspective view illustrating a structure of a clamp jig that constitutes the adjustment device main body according to the embodiment.

FIG. 9 is a vertical sectional view showing a structure of a clamp jig in the embodiment.

FIG. 10 is a rear view showing the structure of the transmission screen in the embodiment.

FIG. 11 is a schematic configuration diagram of a laser positioning device.

FIG. 12 is a schematic view showing a determination device of the laser positioning device.

FIG. 13 is a block diagram for explaining the control of the position adjusting device of the light modulation device and the structure of image processing in the embodiment.

FIG. 14 is a screen display when a program for controlling the position adjusting device of the light modulation device in the embodiment is executed.

FIG. 15 is a flowchart illustrating a procedure for performing focus alignment adjustment in the embodiment.

FIG. 16 is a schematic diagram for explaining a reference pattern setting method in the embodiment.

FIG. 17 is a flowchart illustrating a specific procedure for executing position correction of the CCD camera.

FIG. 18 is a view showing a structure of a different position adjusting device according to the present invention and corresponding to FIG. 4;

FIG. 19 is a view showing a structure of a different position adjusting device of the present invention and corresponding to FIG. 5;

FIG. 20 is a view corresponding to FIG. 5 and showing the structure of still another position adjusting device according to the present invention.

[Explanation of symbols]

2 Position Adjusting Device for Light Modulator 30 Adjusting Unit Main Body 40 Projecting Unit Main Body 31 Position Adjusting Mechanism 53 Screen 55 Detecting Device (CCD Camera) 60 Reflecting Device 63 Mirror 63A Reflecting Surface 70 Control Device (Computer) 80 Laser Positioning Device 62 Laser Light irradiation device 83 Laser light detection device 84 Judgment device 141R, 141G, 141B Light modulation device (liquid crystal panel) 311 Planar position adjustment unit 150 Color synthesis optical system (cross dichroic prism) 160 Projection optical system (projection lens)

Claims (6)

[Claims] A plurality of light modulating devices; a synthesizing optical system for synthesizing light modulated by the light modulating devices; and a projection optical system for enlarging and projecting a light beam synthesized by the synthesizing optical system to form a projection image. A position adjustment device of a light modulation device that adjusts a position of the light modulation device with an optical unit including a light source irradiating light toward the light modulation device; and the projection optical system. A screen for displaying an image projected through the screen, a detecting device for detecting information of the projected image displayed on the screen, and adjusting the position of the light modulator based on the information detected by the detecting device. A position adjusting mechanism, and a reflecting device that reflects the projection light projected from the light source via the projection optical system toward the screen, wherein the reflecting device is directly opposed to the projection optical system. Or The position adjusting apparatus for an optical modulation device, characterized in that it is movable in the proximity spacing direction relative to the projection optical system. 2. The position adjusting device for a light modulation device according to claim 1, wherein the light source emits a plurality of lights toward each of the light modulation devices, and the reflection device emits the projected light. A position adjusting device for an optical modulation device, comprising a plurality of mirrors arranged in the same plane according to the position of the light modulator. 3. The position adjusting device according to claim 1, wherein the reflecting device includes a plurality of sets each having a reflecting surface.
The position adjusting device of the light modulation device, wherein the reflecting surfaces of each of these sets are arranged to face each other. 4. The position adjusting device for a light modulation device according to claim 1, wherein said detecting device detects information of a projected image displayed on a front surface of said screen from a back surface of said screen. A position adjusting device for an optical modulation device, comprising: 5. The position adjusting device for a light modulation device according to claim 1, wherein said light source and said position adjusting mechanism comprise an adjusting portion main body, and said screen, said detecting device and said reflection device. A projection unit main body is provided with a device, and a laser positioning device for directly arranging the adjustment unit main body and the projection unit main body with each other is provided, and the laser positioning device is provided in the adjustment unit main body. A laser light irradiation device that irradiates laser light toward the reflection device, a laser light detection device that detects the laser light reflected by the reflection device, and a reflection device based on the detection by the laser light detection device. A position adjusting device for an optical modulation device, comprising: a determination device for determining an attitude. 6. The position adjustment device for a light modulation device according to claim 1, wherein the position adjustment mechanism is configured to adjust a back focus position of the projection optical system to be adjusted, the light modulation device and the back focus position. A position adjusting device for an optical modulation device, comprising: a control device that stores a position of the position adjusting mechanism according to a combined optical system for each model of the optical unit.