JP2002318367A - Method for adjusting position of color combining optical system, system for adjusting position of color combining optical system, color combining optical system adjusted with the method for adjusting position, and projector furnished with the color combining optical system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for adjusting the position of a color combining optical system by which the position of the color combining optical system is accurately performed with respect to an optical component casing which accommodates optical components composing a color separation optical system. SOLUTION: The method for adjusting the position of a color combining optical system by which the position of the color combining optical system is adjusted with respect to the optical component casing which accommodates the color separation optical system, is provided with a laser beam emission process S53 in which a white laser beam is emitted to the optical axis of a light beam which passes through the optical component casing, a combined light detection process S56 in which light beams of respective colors which are separated from the white color laser beam with the color separation optical system are made incident to a light incident end face of the color combining optical system and the light beam combined with the color combining optical system is detected with a detector, and a position adjustment process S55 in which the position of the color combining optical system with respect to the optical component casing is adjusted while performing the combined light detection process S56.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source, a color separation optical system for separating a light beam emitted from the light source into a plurality of color lights, and each color light separated by the color separation optical system as image information. In order to manufacture a projector having a plurality of light modulators that modulate according to the light and a color combining optical system that forms an optical image by combining light fluxes modulated by the respective light modulators,
A position adjusting method of the color combining optical system for adjusting the position of the color combining optical system with respect to an optical component housing for housing the optical components constituting the color separation optical system, a position adjusting system of the color combining optical system, The present invention relates to a color combining optical system adjusted by an adjusting method, and a projector including the color combining optical system.

[0002]

2. Description of the Related Art Conventionally, a projector that modulates a light beam emitted from a light source according to image information and projects the modulated light beam on a screen via a projection lens has been known, and has been used for multimedia presentations at conferences, conferences, exhibitions, and the like. Widely used. Such a projector includes a color separation optical system that separates a light beam emitted from a light source lamp into three color light beams R, G, and B using a dichroic mirror, and an image separation device that separates the separated light beam for each color light beam. There is known a three-plate projector including three light modulation devices that modulate according to information, and a cross dichroic prism that combines light beams modulated by each light modulation device.

Here, optical components such as a dichroic mirror constituting a color separation optical system and a lens array constituting a uniform illumination optical system are provided in an optical component housing in which an optical path from a light source to a light modulator is set. Is stored. The optical component housing includes an upper housing portion having a concave portion for mounting the optical component, and a lower housing portion closing a lower surface of the upper housing portion. A lens mounting part for mounting a lens is provided.

The three light modulators are mounted directly on the light incident end face of the cross dichroic prism, and the cross dichroic prism to which the light modulator is mounted is:
A fixing plate is adhered and fixed to the lower surface, and is fixed to the lower part of the housing by a screw before the optical path of the projection lens using a screw hole formed in the fixing plate. In such a configuration, when the light modulators are fixed on the light incident end face of the cross dichroic prism, if the positions of the respective light modulators are not accurately positioned, a pixel shift or the like may occur. Yes, conventionally, the process of housing the optical components in the housing,
The step of fixing the light modulator to the cross dichroic prism is performed separately, and finally the two are combined.

[0005]

However, in such a conventional method, there are variations in the arrangement positions of the optical component housing and internal optical components and variations in the fixing position of the fixing plate to the cross dichroic prism. In some cases, an appropriate projection image cannot be formed. That is, if the fixed position of the cross dichroic prism with respect to the fixed plate is shifted, the fixed plate is fixed to a predetermined position in the lower part of the housing by screws, and accordingly, the position of the cross dichroic prism is also fixed. Therefore, even if an attempt is made to adjust the cross dichroic prism with respect to the optical axis of the light beam set in the optical component housing, it cannot be adjusted, and it is not possible to synthesize appropriate color light, and the projection lens needs to be adjusted. However, there is a problem that the image quality of the image projected through the camera becomes poor.

An object of the present invention is to provide a light source, a color separation optical system for separating a light beam emitted from the light source into a plurality of color lights,
A plurality of light modulators for modulating each color light separated by the color separation optical system in accordance with image information, and a color combining optical system for forming an optical image by combining light beams modulated by each light modulator. In the projector provided with, for the optical component housing that houses the optical components that constitute the color separation optical system,
Position adjusting method of color synthesizing optical system capable of positioning position of color synthesizing optical system with high accuracy, position adjusting system of color synthesizing optical system, color synthesizing optical system adjusted by this position adjusting method, and color synthesizing An object of the present invention is to provide a projector provided with an optical system.

[0007]

In order to achieve the above object, a method for adjusting the position of a color combining optical system according to the present invention comprises the steps of:
A color separation optical system that separates a light beam emitted from the light source into a plurality of color lights, a plurality of light modulation devices that modulate each color light separated by the color separation optical system according to image information, and a light modulation device. In order to manufacture a projector having a color combining optical system that forms an optical image by synthesizing a light flux modulated by the device, for an optical component housing that houses optical components that constitute the color separation optical system, A method for adjusting the position of the color synthesizing optical system, comprising: a laser light emitting step of emitting white laser light on an optical axis of a light beam passing through the optical component housing; A combined light detection step of causing each color light obtained by separating the laser light by the color separation optical system to be incident on a light incident end face of the color combining optical system, and detecting a light beam combined by the color combining optical system with a detection device; This combined light detection step is performed Reluctant, characterized in that it includes a position adjustment step of adjusting the position of the color synthesizing optical system with respect to the optical component casing.

According to the present invention, when the position of the color synthesizing optical system is adjusted, the laser beam emitting step, the synthesized light detecting step, and the position adjusting step are performed, whereby the white laser light is color-separated. The optical system separates the light into a plurality of color lights such as RGB and makes the light incident on the light incident end face of the color combining optical system. Since the position adjustment of the optical system can be performed, the positioning of the color combining optical system with respect to the optical component casing can be performed with high accuracy.

In the above, when the detecting device is a point sensor, the above-described method of adjusting the position of the color combining optical system adjusts the end of the position adjusting step while monitoring the detection state of the combined light detecting step. Preferably, the method includes a step. Here, as a method of determining the end of the position adjustment step, a method of determining the end of the adjustment when the area of the combined light detected by the point sensor is minimized can be adopted. The determination as to whether or not the area of the combined light is minimized is performed by inputting a detection signal of the detection device to a computer or the like via an image capturing device such as a video capture board, and processing the image with software such as image processing software. Can be performed.

The provision of the adjustment end determination step as described above allows the position adjustment of the color combining optical system to be performed.
Whether or not the adjustment has been completed can be automatically determined by a computer or the like, so that the position adjustment of the color combining optical system can be automatically performed by using a computer or the like. Further, by determining whether or not the position adjustment has been completed when the area of the combined light detected by the point sensor is minimized, one white laser beam separated by the color separation optical system can be used. Since the color combining optical system returns to one white laser beam again, it is determined that the relative position between the optical component housing including the color separation optical system and the color combining optical system has been adjusted to the optimal position. Thus, highly accurate position adjustment can be performed by a simple determination method.

Further, the above-described color synthesizing optical system includes a prism for synthesizing color light, and a fixing plate which is adhered to a lower surface of the prism with a photo-curing adhesive and is mechanically fixed to a housing for an optical component. If provided, the position adjustment method of the color combining optical system is such that the position adjustment step is performed in a state where the photocurable adhesive is uncured, and after the adjustment end determination step, the photocurable adhesive is irradiated with a light beam. Preferably, an adhesive curing step of curing the adhesive is provided. The irradiation of the light beam in the adhesive curing step can be performed from the upper surface side of the prism.

By performing the position adjusting step in a state where the photocurable adhesive is not cured, the position of the prism with respect to the fixing plate can be freely adjusted. The position of the prism can be adjusted to an appropriate position, and after the completion of the adjustment, light is irradiated to cure the photocurable adhesive, and the prism can be positioned at an optimum position.

The fixing plate has a spherical bulge formed on the fixing surface of the prism. In the position adjusting step, the adhesive is in an uncured state and the prism is bulged. It is preferable to adjust the position of the prism three-dimensionally on the fixed plate in a state where the prism is in contact with the protrusion.

When a color synthesizing prism and a fixing plate are bonded and fixed by a conventional method, as shown in FIG.
When the prism 150 with poor cutting accuracy is pressed against the fixing plate 152 and fixed, both surfaces are aligned with each other, and the vapor deposition surface and the side surface outer position of the prism 150 are inclined. The prism 150 cannot be arranged on the optical axis. In the present invention, as shown in FIG. 1B, a spherical bulging portion 152B is formed on the end surface of the fixing plate 152, and the color synthesizing prism 150 comes into contact with the bulging portion 152B of the fixing plate 152. In this state, the prism 150 for color synthesis and the bulging portion 152B of the fixing plate 152 contact at a point by being adhered by the ultraviolet curing adhesive 153, and the prism 1 for color synthesis is bonded.
Even when the cutting accuracy of the prism 50 is poor, the vapor deposition surface and the side profile of the prism 150 can be adjusted three-dimensionally without being affected by the cutting accuracy of the prism 150. Ensuring accuracy,
The prism 150 and the fixing plate 152 can be properly fixed.

It is preferable that the photocurable adhesive is filled so as to fill a gap between the lower surface of the prism and the fixing plate, which is formed by a bulging portion of the fixing plate. In such a configuration, the photocurable adhesive is
As shown in (b), by filling the gap between the lower surface of the prism 150 for color synthesis and the fixed plate 152,
The lower surface of the prism 150 for color synthesis is supported by the fixing plate 152.
Not only support by point contact by the bulging portion 152B,
The cover can be covered with the filled ultraviolet curing adhesive 153, and the fixing between the prism 150 and the fixing plate 152 can be stably maintained.

In the above-mentioned bulging portion, the height of the bulging portion is in the range of 50 to 100% with respect to the maximum tolerance of the cutting accuracy of the lower surface of the prism, and the radius of curvature of the bulging portion is Preferably, the area of the bulging portion is determined to be 1 to 50% of the area of the lower surface of the prism. Here, when the height of the above-mentioned bulging portion is formed so as to be smaller than 50% with respect to the maximum cutting accuracy tolerance of the lower surface of the color synthesizing prism, as shown in FIG.
When trying to adjust the side profile of the prism 150,
The bulging portion 152B of the fixing plate 152 does not contact the lower surface of the prism 150, and the prism 150 cannot be adjusted. In addition, the height of the bulging portion 152B is adjusted by the prism 1 for color synthesis.
In the case where the lower surface of the prism 50 is formed to be larger than the maximum tolerance A of the cutting accuracy, the lower surface of the prism 150 is separated from the fixed plate 152 as shown in FIG. A large amount of the UV-curable adhesive 153 to be filled in the gap is required, which increases the cost and deteriorates the workability. Therefore, it is preferable that the height of the bulging portion 152B of the fixing plate 152 is formed in the range of 50 to 100% with respect to the maximum cutting accuracy A of the lower surface of the prism 150 for color synthesis.

Furthermore, when the radius of curvature of the bulging portion is determined so that the area of the bulging portion becomes larger than 50% of the area of the lower surface of the color synthesizing prism, as shown in FIG. Since the contact point between the lower surface of the prism 150 and the bulging portion 152B is farther than the center of the prism 150, the fixing between the prism 150 and the fixing plate 152 becomes unstable.
In addition, the bulge 15
The bulging portion 15 is formed so that the area of 2B becomes smaller than 1%.
When the radius of curvature of 2B is determined, as shown in FIG. 2D, the strength of the bulging portion 152B with respect to the fixing plate 152 becomes weak, and the fixing between the prism 150 and the fixing plate 152 becomes unstable. Therefore, the radius of curvature of the bulging portion 152B is larger than the area of the lower surface of the color synthesizing prism 150.
It is preferable to determine the area of 2B to be 1 to 50%.

Further, in the position adjusting system for a color combining optical system according to the present invention, a light source, a color separating optical system for separating a light beam emitted from the light source into a plurality of color lights, and the color separating optical system. To manufacture a projector including a plurality of light modulators that modulate each color light according to image information, respectively, and a color combining optical system that forms an optical image by combining light beams modulated by the respective light modulators. A position adjusting system of a color combining optical system that adjusts a position of the color combining optical system with respect to an optical component housing that houses optical components constituting the color separation optical system, wherein the inside of the optical component housing is A laser light emitting device that supplies white laser light on the optical axis of a light beam passing therethrough, and each color light obtained by separating the white laser light by the color separation optical system is incident on a light incident end face of the color synthesis optical system; Synthesized by color synthesis optics A combined light detector for detecting light bundle, based on the detected combined light in the combined light detection device, characterized in that it includes a position adjustment device for adjusting the position of the color synthesizing optical system. According to such a position adjusting system for a color combining optical system of the present invention, the above-described method for adjusting the position of the color combining optical system can be performed.
The above-described functions and effects can be similarly enjoyed.

In the position adjustment system, it is preferable that the combined light detection device includes an adjustment end determination unit that determines the end of position adjustment of the color combining optical system while checking the detection state of the combined light. By providing the adjustment end determination unit, the adjustment end determination step of the position adjustment method can be performed. Further, when the color combining optical system includes a prism and a fixing plate that is adhered to a lower surface of the prism with a light-curable adhesive and is mechanically fixed to the optical component housing, the position adjustment device includes: It is preferable to include a prism holding unit that holds the prism, and a light irradiation unit that emits a light beam that cures the photocurable adhesive. By providing the prism holding unit and the light beam irradiating unit in this way, it is possible to perform the adhesive curing step of the position adjusting method.

In the above-described color synthesizing optical system, the fixing plate has a spherical bulge formed on a fixing surface of the prism, and the prism has at least a part of the bulge. It is preferable that the fixing plate is adhered and fixed to the fixing plate while being in contact with the protrusion. In such a configuration, the fixing plate has a spherical bulge formed on the fixing surface of the prism, and the prism is bonded in a state where at least a part of the prism is in contact with the bulge. Therefore, the position of the prism can be adjusted three-dimensionally with respect to the fixed plate, and the same operation and effect as those of the above-described position adjustment method can be obtained. Here, it is preferable that the photo-curing adhesive is applied so as to fill a gap between the lower surface of the prism and the fixing plate, which is formed by a bulging portion of the fixing plate. Further, the height of the bulging portion of the fixing plate is 50 to 10 with respect to the maximum tolerance of cutting accuracy on the lower surface of the prism.
0%, and the radius of curvature of the bulging portion is such that the area of the bulging portion is 1 to 50% with respect to the area of the lower surface of the prism.
It is preferable to be determined so that In such a configuration, the light-curing adhesive interposed between the prism and the fixing plate and the bulging portion formed with the appropriate dimensions described above,
The color synthesizing optical system whose position has been adjusted with high precision can be stably maintained.

[0021]

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 FIG. 3 shows a color separation optical system, a plurality of light modulation devices, a color synthesis optical system, and a projection to be adjusted by the position adjustment system of the light modulation device according to the embodiment of the present invention. The structure of a projector 100 employing an optical unit including an optical system is shown. The projector 100 includes an integrator illumination optical system 110, a color separation optical system 120, a relay optical system 130, an electro-optical device 140, a cross dichroic prism 150 serving as a color combining optical system, and a projection lens 160 serving as a projection optical system. I have.

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 141B serving as three light modulating devices, each of which uses, for example, a polysilicon TFT as a switching element. 12
0 are separated by these three liquid crystal panels 14.
The optical image is modulated by the 1R, 141G, and 141B in accordance with image information. The cross dichroic prism 150 serving as the color combining optical system forms a color image by combining images modulated for each color light emitted from the three liquid crystal panels 141R, 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 emitted from the projection lens 160 and is enlarged and projected on a screen.

(2) Structure of Optical Unit to be Adjusted In such a projector 100, the optical components constituting the integrator illumination optical system 110, the color separation optical system 120, and the relay optical system 130 are as shown in FIG. In addition, it is housed inside an upper light guide 171 constituting a housing for an optical component, and attached to the upper light guide 171 with a clip or the like.

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. More 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 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 incident end surface 151 of the cross dichroic prism 150. Have been. Here, a rectangular opening 143B is formed in the holding frame 143,
Each of the liquid crystal panels 141R, 141G, and 141B is exposed at the opening 143B, and this portion becomes an image forming area. That is, each of the liquid crystal panels 141R, 141G, 14
Each color light R, G, B is introduced into this portion of 1B, and an optical image is formed according to image information.

The cross dichroic prism 15
A fixing plate 152 is bonded and fixed to the lower surface of the base plate 0 with an ultraviolet curable adhesive, and a hole 152A for screw fixing is formed in the fixing plate 152. This fixing plate 152
As shown in FIG. 6, a spherical bulge 152B is provided at the center.
The cross dichroic prism 150 is filled with an uncured ultraviolet curable adhesive 153 between the cross dichroic prism 150 and the fixing plate 152 with the lower surface of the cross dichroic prism 150 abutting on the bulging portion 152B. The position adjustment of 150 is performed, and after the position adjustment is completed, ultraviolet light is irradiated from the upper surface to the lower surface of the cross dichroic prism 150 to cure the ultraviolet curable adhesive 153. The spherical bulge 152B is formed on the fixed plate 152 because position adjustment in the tilt direction with respect to the optical axis is required.

Here, the actual cross dichroic prism 150 has a tolerance in manufacturing the cross dichroic prism 150 as shown in FIG.
In the present embodiment, the cross dichroic prism 150
Of the spherical bulging portion 15 with respect to the
By setting the height h and the radius of curvature R of 2B to appropriate dimensions, the cross dichroic prism 150 is stably supported. That is, assuming that the maximum tolerance of the cutting accuracy of the cross dichroic prism 150 is A, the height h of the bulging portion 152B is formed to have a dimension of ・ · A, and the area of the lower surface of the cross dichroic prism 150 is Sa. The radius of curvature R of the bulging portion 152B is determined so that the surface area Sb of the bulging portion 152B becomes 1/2 · Sa. By forming the shape of the bulging portion 152B in this way, the bulging portion 152B and the cross dichroic prism 1 are formed.
Reference numeral 50 is a point contact at the center, and the cross dichroic prism 150 can be stably supported and fixed.

The cross dichroic prism 150 and the liquid crystal panels 141R, 141G,
141B is a lower light guide 172 as shown in FIG.
The screw 154 is inserted into the hole 152A of the fixing plate 152 at the stage before the optical path of the projection lens 160, and is fixed to the lower light guide 172 constituting the optical component housing, and the upper light guide 171 and the lower light guide 172 are combined. Thus, an optical unit is configured.

The optical unit having such a configuration is as follows.
Integrator illumination optical system 110, color separation optical system 12
0 and optical components constituting the relay optical system 130 are stored in the upper light guide 171. Next, the lower dichroic prism 15 is attached to the lower light guide 172.
0 and the liquid crystal panels 141R, 141G, 141B,
The fixing adhesive is attached in an uncured state. Then, the upper light guide 171 and the lower light guide 172
Are combined, the positions of the cross dichroic prism 150 and the liquid crystal panels 141R, 141G, and 141B are adjusted using the light beam emitted from the light source, and finally, the adhesive is fixed to the cross dichroic prism 150 and the liquid crystal panel. 141R, 141G, 1
41B is positioned and fixed.

(3) Structure of Position Adjusting System of Light Modulating Apparatus FIGS. 9 and 10 show positions for adjusting the positions of the liquid crystal panels 141R, 141G, 141B and the cross dichroic prism 150 constituting the optical unit. The position adjustment system 2 is shown. The position adjusting system 2 basically includes an adjusting unit main body 3 which is an adjusting device main body.
The optical unit 170 is configured on the adjustment unit main body 30 to perform position adjustment, as shown in FIG.

The adjusting unit main body 30 includes a UV light shielding cover 20A.
And three six-axis position adjustment units 31 for position adjustment of the liquid crystal panels 141R, 141G, and 141B, a prism position adjustment unit 32 for position adjustment of the cross dichroic prism 150, a white laser beam for optical axis position determination, and And a light source unit 37 for emitting an adjustment light source. The UV light shielding cover 20 </ b> A includes a side plate 21 surrounding the six-axis position adjustment unit 31, a bottom plate 22, a door 24 openably and closably provided on the side plate 21, and a mounting table 25 provided below. I have. A transmission window 2 for transmitting the light emitted from the light source unit 37 and transmitted through the projection lens 160 to the projection unit body 40 is provided on the side plate 21.
1A is provided.

The door 24 is provided when the optical unit 170 to be adjusted is supplied and removed, and when the six-axis position adjusting unit 31 is adjusted, and is formed 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,
It comprises a reflection device 60 and a dark room 20B. The dark room 20B includes a side plate 26, a bottom plate 27, and a top plate 28 surrounding the screen unit 50 and the reflection device 60;
The mounting table 29 is provided. The side plate 26 is provided with a transmission window 26A for transmitting light emitted from the light source unit 37 via the optical unit 170, and a caster 29A is provided below the mounting table 29.

(3-1) Structure of Adjusting Unit Main Body The UV shielding cover 20A of the adjusting unit main body 30 has
A shaft position adjusting unit 31 and a clamp jig 33 for supporting and fixing the optical unit 170 to be adjusted are provided. The light source unit 37 is installed below the mounting surface of the optical unit 170 of the clamp jig 33. ing. Also,
Above the clamp jig 33 of the adjustment unit main body 30, a prism position adjustment unit 32 movable in a three-dimensional direction is provided. Although not shown in FIG. 9, the mounting table 25
In the lower part, the adjustment unit main body 30 and the screen unit 50
And a computer 70 (described later), which is a control device for controlling the reflection device 60, cures an ultraviolet-curable adhesive and causes the liquid crystal panels 141 R, 141 G, and 1 of the optical unit 170 to cure.
A fixing ultraviolet light source device for fixing 41B on the cross dichroic prism 150 is provided.

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 end surface 151 of the cross dichroic prism 150. As shown in FIG. 11, the six-axis position adjustment unit 31 includes a plane position adjustment unit 311 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 position of the cross dichroic prism 150 with respect to the light incident end surface 151 and the plane position thereof.
A base 311A slidably mounted on the base 311A;
11A and a leg 311B standing on the
B, which is provided at an upper end portion of the upper surface B, and is provided with an in-plane rotational position adjusting unit 31.
3 is provided with a connection portion 311C to which the connection portion 3 is connected. Base 31
1A moves the mounting table 25 in the Z-axis direction (the left-right direction in FIG. 11) 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. 11) with respect to the base 311A by a driving mechanism (not shown) such as a motor provided on the side. Connection part 311
C is moved in the Y-axis direction (vertical direction in FIG. 11) with respect to the leg 311B by a driving mechanism such as a motor (not shown).

The in-plane rotational position adjusting unit 313 is a unit for adjusting the in-plane rotational positions of the liquid crystal panels 141R, 141G, and 141B with respect to the light incident end surface 151 of the cross dichroic prism 150.
And a rotation adjusting section 313B provided rotatably in the circumferential direction of the base 313A. Then, the rotation adjusting unit 3
13B, the light incident end face 1 can be adjusted.
Liquid crystal panels 141R, 141G, 141B for 51
Can be adjusted with high precision.

The out-of-plane rotation position adjustment unit 315 is a part that adjusts the out-of-plane rotation positions of the liquid crystal panels 141R, 141G, and 141B with respect to the light incident end surface 151 of the cross dichroic prism 150. The out-of-plane rotation position adjustment unit 315 is fixed to the distal end of the in-plane rotation position adjustment unit 313, and has a base 315A having a concave curved surface that forms an arc in the horizontal direction at the end.
A first adjusting portion 315B, which is provided slidably along the arc on the concave curved surface of A and has a concave curved surface that forms an arc in the vertical direction at the tip portion, and a concave surface of the first adjusting portion 315B. Second adjusting portion 315C provided slidably along an arc
And When the motor (not shown) provided on the side of the base 315A is rotationally driven, the first adjusting unit 3
When the motor 15B slides and rotates a motor (not shown) provided above the first adjustment unit 315, the second adjustment unit 315C slides and the liquid crystal panel 141 with respect to the light incident end surface 151.
The out-of-plane rotational positions of R, 141G, and 141B can be adjusted with high accuracy.

The liquid crystal panel holding section 317 serving as a holding section includes:
Liquid crystal panels 141R, 141G, 141 to be adjusted
B, which is provided at the distal end of the second adjusting portion 315C, and is configured to be movable in the Y-axis direction by an actuator 315D provided in the second adjusting portion 315C.

As shown in FIG. 12, the liquid crystal panel holding portion 317 is formed of a metal plate having a substantially Z-shaped side surface, and has a base portion at the upper left in the figure attached to the second adjusting portion 315C. Hole 317A is formed. At the lower right end in the figure, a suction surface 317B for sucking the image forming areas of the liquid crystal panels 141R, 141G, and 141B, and the suction surface 317A.
Suction hole 3 formed at substantially the center of B for sucking air.
17C and four light beam transmission holes 317D penetrating the front and back surfaces of the holding portion 317 on the suction surface 317B. Further, four mirrors 317E are arranged above and below the suction surface 317B so as to form an angle of 45 ° with respect to the suction surface 317B.
Two holes 317F for ultraviolet irradiation are formed at positions corresponding to 17E. Incidentally, the light beam transmitting hole 317D is used.
Are the liquid crystal panels 141R, 141G, 141B to be held.
Are formed at the positions where the luminous flux is introduced into the four corners of the image forming area.

As shown in FIG. 13, the liquid crystal panel holding portion 317 holds the liquid crystal panel 14 on the suction surface 317B.
The liquid crystal panels 141R, 141, and 141B are held while the image forming areas of 1R, 141G, and 141B are attracted. The adjustment light flux emitted from the light source unit 37 and passing through the light guide along the illumination optical axis passes through the light flux transmission hole 317D, and the liquid crystal panels 141R, 141G, 14
1B is incident on the image forming area. The mirror 317E has an optical fiber 38 projecting from the lower surface of the clamp jig 33 and the liquid crystal panel holding portion 31.
The ultraviolet light emitted from the optical fiber 39 disposed on the inner surface of the mirror 7 enters, and the ultraviolet light reflected by each mirror 317E is
The light enters the base end portion of the transparent pin 145, and the front end and the holding frame 143 of the liquid crystal panels 141R, 141G, 141B.
The ultraviolet-curable adhesive applied to the inner surface of the hole 143A formed in the above is cured.

The light source unit 37 includes a cross dichroic prism 150 and liquid crystal panels 141R, 141R.
G and 141B have a light source for position adjustment.
As shown in FIG. 7, a light source section main body 371 and a light guide section 372 are provided. The light source unit main body 371 has a configuration in which a light source lamp 371A serving as a light source for adjustment is housed in a housing, and is a part that supplies a light beam to the optical unit 170. Although not shown, the housing is provided with an opening for cooling the light source lamp 371A and a cooling fan inside the opening. The light-on / off (shutter) control of the light source lamp 371A is performed by a computer 70 described later.

The light guide section 372 is formed of a vertically extending cylindrical body, and has an opening 372A at the upper end thereof, and an opening 372A inside the opening corresponding to the position of the opening 372A. A mirror 372B is provided which is arranged at approximately 45 ° to the opening surface.

The lower end of the light guide 372 extends to the lower part of the mounting table 25, and an opening 372 C is formed in the side surface of the lower end of the light guide 372, and the laser light of the laser light output unit 373 installed at the lower part of the mounting table 25. It faces the injection part. In addition, inside the light guide 372 corresponding to the opening 372C, an opening 3 is provided.
Mirror 3 at an angle of approximately 45 ° with respect to the opening surface of 72C.
72D are arranged.

Further, an opening 372E is formed at a position corresponding to the light emitting portion of the light source lamp 371A of the light source unit main body 371 in the intermediate portion of the light guide 372.
A movable mirror 372F that can be adjusted within a range of approximately 0 to 45 ° with respect to the opening surface of the opening 372E is disposed inside the light guide unit 372 corresponding to E.

Using such a light source unit 37,
When adjusting the optical unit 170 to be adjusted,
The opening 372A at the top of the light guide 372 and the optical unit 1
The light source lamp 371 </ b> A and the laser light output unit 373 of the light source unit main body 371 are brought into contact with the light source lamp replacement opening 70.
The light flux emitted from the light guide is introduced into the light guide, and the cross dichroic prism 150 and the liquid crystal panels 141R,
Position adjustment of 41G and 141B is performed.

More specifically, when white laser light is introduced into the optical unit 170, the movable mirror 372F is moved along the opening 372E, that is, at 0 ° with respect to the opening surface of the opening 372E. In this state, white laser light is emitted from the laser light output unit 373 to make the computer adjust the position of the cross dichroic prism 150 and the optical axis position of the optical unit 170 itself. On the other hand, in a state where the movable mirror 372F is inclined by 45 °, a light beam for adjustment is emitted from the light source lamp 371A of the light source unit main body 371, and the liquid crystal panels 141R, 141G,
The focus and alignment of 41B are adjusted.

The prism position adjusting unit 32 is provided as shown in FIG.
As shown in the figure, the position of the cross dichroic prism 150 is adjusted. The prism holding portion 321 for sucking and holding the cross dichroic prism 150 is connected to the prism holding portion 321. And a drive shaft 322 connected to the mechanism.

The prism holding section 321 has a plane shape substantially similar to the plane shape of the cross dichroic prism 150 to be held, adsorbs the upper surface of the cross dichroic prism 150, and
0 position adjustment is performed. For this reason, the prism holding unit 321
A suction hole 323 is formed on the surface in contact with the cross dichroic prism 150.

The contact surface is provided with an ultraviolet irradiation section 32.
When the prism 4 is formed and the position adjustment by the prism position adjustment unit 32 is completed, the ultraviolet irradiation unit 324 irradiates the ultraviolet light from the ultraviolet irradiation unit 324 to the cross dichroic prism 1.
Through 50, the ultraviolet curable adhesive 153 on the lower surface side is cured. The drive shaft 322 is driven by a motor or the like,
This is a portion for adjusting the attitude of the prism holding portion 321, and the cross dichroic prism 150 adsorbed on the prism holding portion 321 can be adjusted to a three-dimensionally free position.

(3-2) Structure of Projection Unit Main Body In FIG. 9, 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, is disposed on the upper surface of the bottom plate 27 of the dark room 20B, and serves as a projection surface of the optical unit 170 to be adjusted; A CCD camera 55 which is provided on the back surface of the light modulation device and constitutes a detection device of a position adjusting device of the light modulation device; , 56 to the transmissive screen 53
And a moving mechanism 57 for moving along the surface.
The transmission screen 53 is provided with a transmission window 53A for transmitting light emitted from the light source unit 37 via the optical unit 170. A position sensor 58 for detecting white laser light output from the laser light output unit 373 is provided at the lower center of the mirror 63.

As shown in FIG. 16, 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.

Each of the CCD camera 55 as a detecting device and the CCD camera 56 as a light ray detecting section is an area sensor using a charge coupled device as an image pickup device, and is formed on the back side of the screen main body 533. The detected projected image is detected and output as an electric signal. In the present embodiment, the CCD camera 55,
56 is attached via a moving mechanism 57 near four corners of a rectangular projection image displayed on the transmissive screen 53, and the CCD camera 55 is near the four corners of the projection image, and the CCD camera 56 is near the four corners of the projection image. , Are arranged at substantially the center of the projected image. Note that these CCD cameras 55 and 56
Has a zoom / focus mechanism for detecting a projected image with high accuracy, and can freely adjust the zoom / focus by remote control. The position sensor 58 serving as a point sensor is a device that includes a semiconductor position detecting element and measures a two-dimensional position of a light spot such as white laser light, and a photodiode is used as the detecting element.

The moving mechanism 57 includes a horizontal portion 571 extending along the horizontal direction of the frame 531, a vertical portion 573 extending vertically, and a camera mounting portion 575 to which the CCD cameras 55 and 56 are mounted. In the CCD camera 55, the vertical portion 573 slides horizontally with respect to the horizontal portion 571,
When the camera mounting portion 575 slides vertically with respect to the vertical portion 573, the camera mounting portion 575 can move freely along the transmissive screen 53.

On the other hand, the CCD camera 56 is
The horizontal portion 571 slides in the vertical direction, and the camera mounting portion 575 slides in the horizontal direction with respect to the horizontal portion 571, so that the horizontal portion 571 can move freely along the transmissive screen 53. . Further, the white laser light is detected by the position sensor 58 when adjusting the prism position, which will be described later, and the white laser light is detected by the position sensor 58 when the optical axis of the optical unit 170 is determined. When adjusting the prism position, the position sensor 5 is used.
8 is used for the cross dichroic prism 15
This is because, when the position of 0 is adjusted, the position of the light spot by the white laser light largely moves, so that it can be detected following the position. These CCD cameras 55, 5
6 and the position sensor 58 can be moved by remote control by a servo control mechanism inside the mounting table 51.

9 and 10, the reflection device 60
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 main body 61 directly opposed to the projection lens 160, and a reflector main 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 section main body 61 includes a mirror 63 disposed in the same plane according to the position of the projection light to be irradiated, a mounting plate 64 to which the mirror 63 is mounted, and a mounting plate 6.
4 and a support plate 65 for supporting the lower part of the support plate 4. The mirror 63 has a reflecting surface 63A whose projection lens 16
It is formed so as to be orthogonal to the optical axis of the projection light emitted from 0.

The reflecting section moving mechanism 62 includes a plurality of rails 66 provided on the bottom plate 22 of the dark room 20B so as to extend in a direction perpendicular to the plane of the transmissive screen 53;
The wheel 67 includes a wheel 67 rotatably movable on the support plate 65 and a driving mechanism (not shown) for driving the wheel 67 to rotate.

(3-3) Control Structure of Position Adjusting System The adjusting unit main body 30, the screen unit 50 and the reflecting 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 controls the CCD camera 55, 56, and a position sensor 58
Is connected to

The projection image picked up by the CCD camera 55 is input to a computer 70 via an image capturing device.
After being converted to an image signal suitable for the computer, the CP
Image processing is performed by an image processing program developed on an OS that controls the operation of the computer 70 including the U, and focus and alignment adjustment of the liquid crystal panels 141R, 141G, and 141B are performed. The projection image captured by the CCD camera 56 is similarly processed by a prism position adjustment program and an optical axis calculation program developed on the OS, and the position adjustment of the cross dichroic prism 150 and the optical axis calculation of the optical unit 170 are performed. Will be The position of the light spot detected by the position sensor 58 is
The data is captured by the computer 70 and processed.

(4) Position Adjusting Operation of Prism and Liquid Crystal Panel by Position Adjusting System In such a position adjusting system 2 of the light modulator,
The adjustment operation of the optical unit 170 to be adjusted is shown in FIG.
This is performed based on the flowchart shown in FIG. (1) First, an optical unit 170 to be adjusted is configured by combining an upper light guide 171 incorporating various optical components shown in FIG. 4 and a lower light guide 172 shown in FIG. Clamp jig 3 for main body 30
Set to 3 (process S1). At this time, only the fixing plate 152 is fixed to the lower light guide 172 with the screw 154, and the ultraviolet curing adhesive 153 is applied to the mounting surface of the cross dichroic prism 150 in an uncured state.

(2) Next, the prism position adjusting unit 3
2, the cross dichroic prism 150 is attached (processing S2), and the liquid crystal panels 141R, 141G, and 141B are attached to the six-axis position adjustment unit 31 (processing S3). The liquid crystal panels 141R, 141G, 141
Attachment of B is performed by inserting pins 145 coated with an ultraviolet-curable adhesive into holes 143A formed at four corners of the holding frame 143 shown in FIG. 5 so that the adhesive is in an uncured state.

(3) By operating the computer, the model data registered for each model of the projector, which is stored in advance in the storage device, is called and loaded on the memory of the CPU (process S4). The model data includes the cross dichroic prism 150 to be adjusted and the liquid crystal panel 1
Design positions of 41R, 141G, and 141B are included, and when each position is adjusted, adjustment is performed using these design positions as initial positions. (4) When the preparation for the adjustment as described above is completed, the prism position is adjusted (process S5), specifically, based on the flowchart shown in FIG.

(4-1) The CPU of the computer 70 outputs a control command to the prism position adjustment unit 32 based on the design position of the cross dichroic prism 150 in the model data loaded on the memory. The prism position adjusting unit 32, based on this control command,
The cross dichroic prism 150 is set to the initial position (Step S51). At this time, the CPU also outputs a control command to the 6-axis position adjustment unit 31 and retracts the attached liquid crystal panels 141R, 141G, 141B to a position where they do not interfere with the white laser light for adjustment of the cross dichroic prism 150. Let it be.

(4-2) The CPU of the computer 70 moves the position sensor 58 to approximately the center of the projected image projected on the transmissive screen 53, and prepares for detection by the position sensor 58 (step S52). . Further, the movable mirror 372F of the light source unit 37 is moved to emit white laser light from the laser light output unit 373 (processing S53: laser light emission step). (4-3) The white laser light emitted from the light source unit 37 is separated into three color lights of RGB in the optical unit 170 and then synthesized again by the cross dichroic prism 150, and the position sensor 58 outputs all the color lights. A light spot image is detected (Step S54).

(4-4) The light spot image detected by the position sensor 58 is taken into the computer 70 as a numerical signal, and the CPU of the computer 70 makes the prism position adjusting unit 32 based on the taken numerical signal.
To adjust the position of the cross dichroic prism 150 (step S55: position adjustment step), and after the adjustment, detect the light spot image again (step S5).
6: synthetic light detection step).

(4-5) The CPU of the computer 70 calculates the area of the light spot image while performing the prism position adjustment, and determines whether or not to end the adjustment based on the calculated area (processing). S57: Adjustment end determination step). Specifically, when the cross dichroic prism 150 is at a position shifted from the illumination optical axis, as shown in FIG. 20, the light spot images SR and S of the separated RGB color lights are separated.
G and SB are formed at shifted positions, and the light spot images SR and
The sum of the areas of SG and SB is larger than the area of the original light spot image SO of the white laser light. Therefore, a state in which the sum of the areas of the light spot images SR, SG, and SB is equal to the area of the original light spot image SO of the white laser light may be determined as the end of the adjustment.

(4-6) Cross dichroic prism 1
When the position adjustment of 50 is completed, the CPU outputs a control command to the prism position adjustment unit 32, and based on this, the prism position adjustment unit 32 irradiates ultraviolet rays from the ultraviolet irradiation unit 324 of the prism holding unit 321. Then, the ultraviolet curable adhesive 153 on the fixing plate 152 is cured (process S58: adhesive curing step), and the position adjustment of the cross dichroic prism 150 is completed.

(5) After the prism position adjusting step is completed,
When the cross dichroic prism 150 is positioned, the optical axis positioning of the optical unit 170 is started (step S6). Specifically, this is performed based on the flowchart shown in FIG. (5-1) First, the projection lens 160 having average optical characteristics is attached to the optical unit 170 as a master lens (step S61). (5-2) Next, the CPU of the computer 70 outputs a control signal to the moving mechanism 57, and causes the position sensor 58 to
The state is switched to the D camera 56, and the detection state of the CCD camera 56 is prepared (step S62).

(5-3) The CPU of the computer 70 outputs a control signal to the laser output unit 373 to irradiate a white laser beam, and projects a spot image on the transmission screen 53 via the projection lens 160. (Processing S63), the spot image projected on the transmissive screen 53 is
It is detected by the CD camera 56 (S64) and output to the computer 70 as a numerical signal. (5-4) The CPU of the computer 70 calculates the center of gravity of the laser spot on the CCD camera 56 at that time (step S65), and stores the optical axis position of the optical unit 170 in the memory (step S66). .

(6) When the optical axis position of the optical unit 170 is determined, the CPU of the computer 70 generates a control command based on the designed positions of the liquid crystal panels 141R, 141G, and 141B included in the model data. And outputs it to the 6-axis position adjustment unit 31.
Move the liquid crystal panels 141R, 141G, and 141B so that the pins 145 move to the cross dichroic prism 15.
It is set to an initial position where it comes into contact with the light incident end face 151 of 0 (process S7).

(7) When the positioning of the optical axis is completed, the liquid crystal panel 14 with respect to the cross dichroic prism 150 is
1R, 141G, and 141B are adjusted (processing S
8) Specifically, it is performed based on the flowchart shown in FIG. (7-1) The CPU of the computer 70 is the light source unit 3
7, the control command is output to the light source unit 37, the movable mirror 372F of the light source unit 37 is moved, the white laser light is switched to the light source lamp 371A of the light source unit main body 371 (process S81), and the light source lamp 371A is turned on. (Shutter open). The light beam emitted from the light source lamp 371A is
The light is supplied to the inside of the optical unit 170 through the light guide 372, enters the liquid crystal panels 141 R, 141 G, and 141 B from the light beam transmission holes 317 D of the liquid crystal panel holding part 317, and enters the four corners of the transmission screen 53 through the projection lens 160. To form a projected image. (7-2) The CPU of the computer 70 moves the four CCD cameras 55 arranged at the corners to the four corner positions based on the optical axis position of the optical unit 170 grasped in the optical axis positioning step. Then, the projected image can be detected by each CCD camera 55 (step S82).

(7-3) In this state, the CPU of the computer 70 outputs an image signal, outputs an image signal including an image pattern for alignment adjustment only to the liquid crystal panel to be adjusted, and outputs another image signal. An image signal for displaying a black image is output to the panel (step S83). In this example, since the position of the liquid crystal panel 141G is adjusted first, and then the position of the liquid crystal panels 141R and 141B is adjusted, different image signals are sequentially output in accordance with the adjustment. The liquid crystal panels 141R, 141G, 141
When adjusting the position of B, 3 CC
Using the D camera, three liquid crystal panels 141R and 14
The positions of 1G and 141B may be adjusted at the same time. If the positions are adjusted at the same time, the speed of the adjustment can be greatly increased.

(7-4) The CPU of the computer 70 adjusts the focus of the liquid crystal panel 141G so as not to move the optical axis position obtained in the preprocessing S7 (processing S8).
4) When the focus adjustment is completed, alignment adjustment is performed using the image pattern (process S85). (7-5) When the position adjustment of the liquid crystal panel 141G is completed,
Ultraviolet rays are radiated from the optical fibers 38 and 39 to
(5) The ultraviolet curable adhesive at the tip is cured (Step S8).
6) Then, an image signal is output and the next liquid crystal panel 1 is output.
Start adjustment of 41R, all liquid crystal panels 141R,
The above procedure is repeated until the position adjustment of 141G and 141B is completed (process S87).

(5) Effects of the Embodiment According to the present embodiment, the following effects can be obtained. When adjusting the position of the cross dichroic prism 150 serving as a color synthesizing optical system, the laser light emitting step S5
3. Synthetic light detection step S56 and position adjustment step S55
Is performed to convert the white laser light into the color separation optical system 1.
At 20, the light is separated into three color lights of RGB and made incident on the light incident end face 151 of the cross dichroic prism 150,
Since the position of the cross dichroic prism 150 can be adjusted while detecting the combined light beam with the position sensor 58, the positioning of the cross dichroic prism 150 with respect to the optical unit 170 can be performed with high accuracy.

Since the adjustment end determination step S57 is provided, the end of the position adjustment of the cross dichroic prism 150 can be automatically determined by the computer 70, so that the adjustment of the cross dichroic prism 150 can be speeded up and simplified. Can be achieved. Further, the determination as to whether or not the position adjustment has been completed is made based on the light spots SR and S.
By performing the processing by minimizing the sum of the areas of G and SB, the position of the cross dichroic prism 150 with respect to the optical unit 170 can be adjusted to an optimum position, and highly accurate position adjustment can be realized by a simple determination method.

Since the position adjustment step S55 is performed with the ultraviolet-curable adhesive 153 uncured, the position of the cross dichroic prism 150 can be freely adjusted. Agent curing process S
Since step 58 is performed, the position of the cross dichroic prism 150 with respect to the optical unit 170 can be determined at an optimum position.

Since the spherical bulge 152B is formed on the fixing plate 152, the cross dichroic prism 150 and the bulge 152B come into contact at a point, and even if the cross dichroic prism 150 has poor cutting accuracy,
The position of the cross dichroic prism 150 can be three-dimensionally adjusted by using the prism position adjustment unit 32, and the position of the outer shape of the side surface of the cross dichroic prism 150 and the vapor deposition surface formed in a substantially X-shape can be appropriately adjusted. Can be. Similarly, the position of the cross dichroic prism 150 can be properly adjusted without being affected by the surface roughness of the cross dichroic prism 150.

The lower surface of the cross dichroic prism 150 is supported by filling the ultraviolet curable adhesive 153 so as to fill the gap between the lower surface of the cross dichroic prism 150 and the fixing plate 152. The cross dichroic prism 150 and the fixing plate 152, which can be covered by the filled ultraviolet curing adhesive 153 as well as the support by the point contact by the 152B and are fixed by the position adjusting step S5, can be stably maintained. it can.

Further, assuming that the maximum tolerance h of the cross dichroic prism 150 is A, the height h of the bulging portion 152B has a height of ・ · A. The protruding portion 152B contacts the lower surface of the cross dichroic prism 150 at a point, so that the position of the cross dichroic prism 150 can be properly adjusted, and the ultraviolet curing adhesive 153 can be fixed in an appropriate amount. The radius of curvature R of the bulging portion 152B is
The area S of the bulging portion 152B is larger than the area Sa of the joining surface of the cross dichroic prism 150 with the fixing plate 152.
Since b is formed so as to be 1 / 2.Sa, the bulging portion 152B of the fixing plate 152 can support the cross dichroic prism 150 at the central portion of the lower surface, so that stable fixing can be performed. Since the curvature radius is large, the strength of the bulging portion 152B with respect to the fixing plate 152 can be maintained.

(6) Modifications of Embodiment The present invention is not limited to the above-described embodiments, but includes the following modifications. In the above embodiment, the optical axis positioning S7 is performed after the position adjustment of the cross dichroic prism 150, but the present invention is not limited to this. That is, after the position adjustment and positioning of the cross dichroic prism, the position adjustment process of the ordinary light modulation device may be performed.

In the above embodiment, the computer 7
Cross dichroic prism 1 automatically using 0
Although the position adjustment of 50 was performed, the position adjustment is not limited to this, and the position adjustment may be performed manually. Furthermore, in the above-described embodiment, the adjustment target is the optical unit 170 of the projector that performs light modulation using the liquid crystal panels 141R, 141G, and 141B. However, the present invention is not limited to this. The present invention may be adopted to perform the position adjustment of (1). In short, the present invention can be applied to any projector that has a plurality of light modulation devices and needs to combine light beams modulated by each light modulation device with a color combining optical system.

In the above-described embodiment, the end of the position adjustment of the cross dichroic prism 150 is determined in a state where the area of the light spot is minimized. However, the present invention is not limited to this. That is, a state in which the area of the white portion of the light spot is minimized using a CCD camera instead of the point sensor may be used as a criterion of the adjustment end determination. In addition, specific structures, shapes, and the like at the time of carrying out the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0084]

According to the position adjusting method of the color synthesizing optical system of the present invention as described above, when adjusting the position of the color synthesizing optical system, the laser light emitting step, the synthetic light detecting step, and the position adjusting step are performed. Is performed, the white laser light is separated into a plurality of color lights such as RGB by a color separation optical system and is incident on the light incident end face of the color synthesis optical system, and the light flux synthesized by the color synthesis optical system is detected by a detection device. Since the position adjustment of the color combining optical system with respect to the optical component casing can be performed while detecting, the positioning of the color combining optical system with respect to the optical component casing can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a mounting structure of a color combining optical system for explaining an operation of the present invention.

FIG. 2 is a side view illustrating a mounting structure of a color combining optical system for explaining an operation of the present invention.

FIG. 3 is a schematic diagram illustrating a structure of an optical unit to be adjusted by a position adjusting method according to the embodiment of the present invention.

FIG. 4 is a schematic perspective view illustrating a structure of an optical component casing in the embodiment.

FIG. 5 is a schematic perspective view illustrating a structure for attaching a light modulation device to the color combining optical system in the embodiment.

FIG. 6 is a side view illustrating a mounting structure of a color combining optical system in the embodiment.

FIG. 7 is a side view illustrating a mounting structure of a color combining optical system in the embodiment.

FIG. 8 is a schematic perspective view illustrating a structure of an optical component casing in the embodiment.

FIG. 9 is a side view illustrating a structure of a position adjustment system of the light modulation device that performs the position adjustment method of the color combining optical system in the embodiment.

FIG. 10 is a plan view illustrating a structure of a position adjustment system of the light modulation device in the embodiment.

FIG. 11 is a side view illustrating a structure of a position adjusting mechanism of the light modulation device in the embodiment.

FIG. 12 is a schematic perspective view illustrating a structure of a holding unit of the light modulation device in the embodiment.

FIG. 13 is a vertical sectional view illustrating a structure for attaching a light modulation device to a color combining optical system in the embodiment.

FIG. 14 is a schematic diagram illustrating a structure of an adjustment light source and a laser light output unit in the embodiment.

FIG. 15 is a side view and a plan view illustrating a structure of a position adjusting device of the color combining optical system in the embodiment.

FIG. 16 is a front view showing a screen for projecting a projection image, a detecting device, and an optical axis detecting device in the embodiment.

FIG. 17 is a block diagram showing a control structure of the system in the embodiment.

FIG. 18 is a flowchart illustrating a procedure of position adjustment in the embodiment.

FIG. 19 is a flowchart illustrating a procedure of prism position adjustment in the embodiment.

FIG. 20 is a schematic diagram showing a criterion for judging the end of the adjustment of the prism position adjustment in the embodiment.

FIG. 21 is a flowchart showing a procedure for determining an optical axis position of the light modulation device in the embodiment.

FIG. 22 is a flowchart showing a procedure of position adjustment of the light modulation device in the embodiment.

[Explanation of symbols]

2 Position Adjustment System 32 Prism Position Adjustment Unit (Position Adjustment Device) 58 Point Sensor (Detection Device, Synthetic Light Detection Device) 120 Color Separation Optical System 141R, 141G, 141B Liquid Crystal Panel (Light Modulation Device) 150 Cross Dichroic Prism (Color Synthesis) Optical system) 152 Fixing plate 152B Swelling portion 153 UV-curable adhesive (light-curable adhesive) 171 and 172 Light guide (housing for optical component) 321 Prism holding unit 324 Ultraviolet irradiation unit (light irradiation unit) S53 laser Light emission step S56 Synthetic light detection step S55 Position adjustment step S58 Adhesive curing step A Maximum cutting accuracy tolerance h Height of bulging part R Radius of curvature of bulging part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 21/00 G03B 33/12 33/12 G02B 7/18 A (72) Inventor Hidetoshi Hashizume Suwa City, Nagano Prefecture Daiwa 3-chome 3-5 Seiko Epson Corporation F-term (reference) 2H042 CA06 CA10 CA14 CA15 CA17 2H043 AD06 AD08 AD11 AD14 AD16 AD17 AD21 BA00 2H052 BA02 BA03 BA09 BA14

Claims (14)

[Claims] A light source, a color separation optical system for separating a light beam emitted from the light source into a plurality of color lights, and a plurality of color light beams separated by the color separation optical system, each of which modulates the light in accordance with image information. In order to manufacture a projector including a light modulating device and a color synthesizing optical system that forms an optical image by synthesizing a light flux modulated by each light modulating device, the optical components forming the color separation optical system are housed. A position adjusting method of a color combining optical system for adjusting a position of the color combining optical system with respect to an optical component casing, wherein white laser light is emitted on an optical axis of a light beam passing through the optical component casing. A laser light emitting step, and each color light obtained by separating the white laser light by the color separation optical system is incident on a light incident end face of the color synthesis optical system, and a light flux synthesized by the color synthesis optical system is detected by a detection device. A combined light detection step for detecting While performing the Shigemitsu detection process, the position adjustment method of a color combining optical system characterized by comprising a position adjustment step of adjusting the position of the color synthesizing optical system with respect to the optical component casing. 2. The position adjusting method for a color combining optical system according to claim 1, wherein the detecting device is a point sensor, and monitors the detection state of the combined light detecting step to terminate the position adjusting step. A position adjusting method for a color combining optical system, comprising: an adjusting end determining step. 3. The position adjusting method for a color combining optical system according to claim 2, wherein the adjusting end determining step determines that the adjusting is completed when the area of the combined light detected by the point sensor is minimized. A position adjusting method of the color combining optical system. 4. A position adjusting method for a color synthesizing optical system according to claim 2, wherein said color synthesizing optical system includes a prism for color light synthesis, and a photo-curing type on a lower surface of said prism. A fixing plate that is adhered by an adhesive and is mechanically fixed to the optical component housing, wherein the position adjustment step is performed in a state where the photocurable adhesive is uncured; A method for adjusting the position of a color synthesizing optical system, comprising an adhesive curing step of irradiating a light beam to the photocurable adhesive after the step to cure the adhesive. 5. The position adjusting method for a color combining optical system according to claim 4, wherein said fixing plate has a spherical bulge formed on a fixing surface of said prism. , The adhesive is in an uncured state, and
A position adjusting method for a color synthesizing optical system, wherein a position of a prism is three-dimensionally adjusted on a fixing plate in a state where the prism is in contact with a bulging portion. 6. The method for adjusting the position of a color synthesizing optical system according to claim 5, wherein the photocurable adhesive is formed by a bulging portion of the fixing plate and the lower surface of the prism and the fixing plate. A method of adjusting the position of a color synthesizing optical system, wherein the method is applied so as to fill a gap between the two. 7. The method for adjusting the position of a color synthesizing optical system according to claim 5, wherein the height of the bulging portion of the fixing plate is set at 50 to the maximum tolerance of cutting accuracy on the lower surface of the prism. -100%, and the radius of curvature of the bulge is determined so that the area of the bulge is 1 to 50% with respect to the area of the lower surface of the prism. How to adjust the position of the color combining optical system. 8. A light source, a color separation optical system for separating a light beam emitted from the light source into a plurality of color light beams, and a plurality of color light separation devices for modulating each of the color light beams separated by the color separation optical system according to image information. In order to manufacture a projector including a light modulating device and a color synthesizing optical system that forms an optical image by synthesizing a light flux modulated by each light modulating device, the optical components forming the color separation optical system are housed. A position adjusting system of a color synthesizing optical system for adjusting a position of the color synthesizing optical system with respect to an optical component housing to supply white laser light on an optical axis of a light beam passing through the optical component housing. A laser light emitting device, and a combining unit that causes each color light obtained by separating the white laser light by the color separation optical system to be incident on a light incident end face of the color combining optical system, and detects a light flux combined by the color combining optical system. Photodetector and this combined light Based on the detected detection device combined light, the position adjustment system of a color combining optical system characterized by comprising a position adjusting device for adjusting the position of the color synthesizing optical system. 9. The position adjusting system for a color combining optical system according to claim 8, wherein the combined light detection device determines the end of the position adjustment of the color combining optical system while monitoring a detection state of the combined light. A position adjustment system for a color combining optical system, comprising: 10. The position adjusting system for a color synthesizing optical system according to claim 8, wherein said color synthesizing optical system comprises a color synthesizing prism and a photo-curing adhesive on a lower surface of said prism. A fixing plate that is bonded and mechanically fixed to the optical component casing, the position adjustment device irradiates a prism holding unit that holds the prism, and a light beam that cures the photocurable adhesive. A position adjusting system for a color synthesizing optical system, comprising: 11. A color synthesizing optical system comprising a color synthesizing prism and a fixing plate that is adhered to the lower surface of the prism with a light-curing adhesive and is mechanically fixed to an optical component housing. The fixing plate has a spherical bulge formed on a fixing surface of the prism, and the prism is fixed in a state where at least a part of the prism is in contact with the bulge. A color combining optical system characterized by being fixedly adhered to a plate. 12. The color synthesizing optical system according to claim 11, wherein the photocurable adhesive fills a gap between the lower surface of the prism and the fixing plate, which is formed by a bulging portion of the fixing plate. A color synthesizing optical system characterized by being applied as follows. 13. The color synthesizing optical system according to claim 11, wherein the height of the bulging portion of the fixing plate is 5 to the maximum cutting accuracy tolerance on the lower surface of the prism.
The radius of curvature of the bulging portion is 1 to 100% with respect to the area of the lower surface of the prism.
A color synthesizing optical system characterized in that it is determined to be 〜50%. 14. A projector comprising a color synthesizing optical system adjusted by the method for adjusting a color synthesizing optical system according to any one of claims 1 to 7.