JP2008242099A - Manufacture device for optical device, position adjusting method, position adjusting program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacture device for an optical device by which an optical modulator is accurately positionally adjusted. <P>SOLUTION: A controller 40 constituting the manufacture device includes: a pattern forming part 433 making the optical modulator form a one-dot pattern where only one display pixel is set to prescribed brightness in an adjusting area used for position adjustment out of the image forming area of the optical modulator thereon; a center-of-gravity position calculation part 4,362A calculating the position of the center of gravity in a corresponding area corresponding to a display pixel in a picked-up image picked up by an imaging apparatus on the basis of each luminance value of every pixel in the picked-up image; a deviation calculation part 4,362B calculating deviation between the position of the center of gravity and a preset reference position; and a fine adjustment control part 4,362C positioning the optical modulator at the prescribed position relative to a color synthesizing optical device by driving and controlling a position adjusting device on the basis of the deviation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical device manufacturing apparatus, a position adjustment method, a position adjustment program, and a recording medium.

Conventionally, three light modulation devices (liquid crystal panels) that modulate three color lights of R, G, and B according to image information for each color light, and these liquid crystal panels are attached to synthesize three modulated light beams A projector is known that includes an optical device that includes a color synthesis optical device (cross dichroic prism) and a projection optical device (projection lens) that magnifies and projects a light beam emitted from the cross dichroic prism.
In such a projector, in order to obtain a clear image, each liquid crystal panel must be at the back focus position of the projection lens. Further, in order to obtain a clearer image, it is necessary to prevent occurrence of pixel shift between the liquid crystal panels.
For this reason, at the time of manufacturing the projector, focus adjustment for accurately disposing each liquid crystal panel at the back focus position of the projection lens and alignment adjustment for matching the pixels of each liquid crystal panel are performed with high accuracy. An optical apparatus manufacturing apparatus that performs such adjustment to manufacture an optical apparatus is known (see, for example, Patent Document 1).

The manufacturing apparatus described in Patent Document 1 performs alignment adjustment as described below.
That is, an image pattern in which each pixel in a predetermined rectangular area in the image forming area of the liquid crystal panel is set to a predetermined brightness is formed on the liquid crystal panel, and the projection displayed on the screen via the cross dichroic prism and the projection lens The four corners of the image (image pattern) are respectively imaged by four CCD cameras. Also, the positions of the four corners (the positions of the four corners of the liquid crystal panel) are detected by comparing each captured image captured by the four CCD cameras with a preset reference pattern (pattern matching process). Then, a deviation amount of the liquid crystal panel from a desired alignment position (a deviation amount in a plane perpendicular to the optical axis direction (Z-axis direction) of the light beam incident on the liquid crystal panel) is calculated. Then, based on the calculated shift amount, the liquid crystal panel is moved within the plane and positioned at a desired alignment position.

JP 2006-208472 A (FIGS. 18, 24, 25)

By the way, the light beam passing through the side of the projection lens that is away from the lens optical axis is affected by the lens characteristics (flare) of the projection lens. That is, in the projected image displayed on the screen, each pixel at the four corners does not form the outline shape (substantially rectangular shape) of each pixel of the liquid crystal panel due to the flare, but becomes a substantially elliptical shape having a spread. . For example, when the pixel pitch of the liquid crystal panel is small, each pixel at the four corners in the projection image has a shape that has spread due to the influence of flare, and thus overlaps each other.
Therefore, even if the pattern matching process is performed on the captured image and the reference pattern of the four corners of the projection image affected by the flare, the shape of the pixel of the preset reference pattern and the shape of the pixel of the actual projection image Therefore, there is a problem that the result of the pattern matching process is adversely affected and the position of the liquid crystal panel cannot be accurately adjusted.

  An object of the present invention is to provide an optical device manufacturing apparatus, a position adjustment method, a position adjustment program, and a recording medium that can adjust the position of a light modulation device with high accuracy.

  The optical device manufacturing apparatus according to the present invention includes a plurality of light modulation devices that modulate image light for each color light according to image information to form image light, and each image formed by the plurality of light modulation devices. An optical device manufacturing apparatus for manufacturing an optical device including a color combining optical device for combining light, which is formed by the light modulation device and enlarged on the screen by the projection optical device via the color combining optical device. An image pickup device that picks up a projected image of the projected image light, and a position adjustment that holds any one of the plurality of light modulation devices and adjusts the position of the light modulation device with respect to the color synthesis optical device And a control device that controls the light modulation device and the position adjustment device, and the control device includes only one display pixel in an adjustment region used for position adjustment in an image forming region of the light modulation device. Where The display in the captured image is based on a pattern forming unit that causes the light modulation device to form a one-dot pattern set to the brightness of the image and each luminance value for each pixel in the captured image captured by the imaging device Based on the deviation, a centroid position calculation unit that calculates a centroid position of a corresponding region corresponding to the pixel, a deviation calculation unit that calculates a deviation between the centroid position and a preset reference position, and the position adjustment device. And an adjustment control unit that controls driving and positions the light modulation device at a predetermined position with respect to the color synthesizing optical device.

In the present invention, the control device constituting the manufacturing apparatus includes a pattern forming unit, a centroid position calculating unit, a deviation calculating unit, and an adjustment control unit.
As a result, the pattern forming unit forms a 1-dot pattern on the light modulation device (pattern formation step) and displays a projected image of the 1-dot pattern on the screen, so that the pixel pitch of the light modulation device is small. However, the pixels do not overlap each other in the projected image.
In addition, since the center-of-gravity position calculation unit calculates the center-of-gravity position of the corresponding area corresponding to the display pixel in the captured image captured by the imaging device (center-of-gravity position calculation step), the planar position of the display pixel, that is, the light modulation device Plane position (position in a plane orthogonal to the Z-axis direction) can be specified.
Then, the deviation calculation unit calculates the deviation between the center of gravity position and a preset reference position (deviation calculation step), and the adjustment control unit positions the light modulation device at a predetermined position with respect to the color synthesis optical device based on the deviation ( Since the adjustment control step), the amount of deviation of the light modulation device from the desired alignment position (the amount of deviation from the reference position in the plane) can be calculated, and the light modulation device can be positioned at the desired alignment position.
Therefore, even when the pixel pitch of the light modulation device is small, the light modulation device can be aligned with high accuracy, and a high accuracy optical device can be manufactured.

In the optical apparatus manufacturing apparatus of the present invention, the barycentric position calculation unit is configured by comparing each luminance value for each pixel in the captured image with a preset threshold value and each pixel having a luminance value equal to or greater than the threshold value. It is preferable to recognize the area to be processed as the corresponding area.
By the way, in the projected image of the one-dot pattern, the area expanded by the influence of the flare of the display pixel is darker than the corresponding area for specifying the planar position of the display pixel.
In the present invention, the center-of-gravity position calculation unit compares each luminance value for each pixel in the captured image with a preset threshold value, for example, an area (corresponding to each pixel having a luminance value equal to or higher than the threshold value) Area) and an area composed of pixels having a luminance value less than the threshold value (including an area widened by the influence of flare) can be discriminated. For this reason, the center-of-gravity position calculation unit can recognize the corresponding area corresponding to the display pixel in a virtual state that is not affected by flare of the projection optical apparatus, and calculates the center-of-gravity position of the corresponding area to obtain the plane of the display pixel. The position, that is, the planar position of the light modulation device can be specified with high accuracy.

In the optical device manufacturing apparatus of the present invention, it is preferable that at least three adjustment regions are provided.
In the present invention, at least three adjustment regions are provided. That is, the centroid position calculation unit calculates the centroid position of each corresponding area corresponding to each display pixel in at least three adjustment areas. Accordingly, at least three positions in the plane of the light modulation device are specified, and alignment adjustment can be performed so that the specified at least three points match each reference position. Accordingly, the light modulation device is not limited to the X-axis direction (horizontal direction) and Y-axis direction (vertical direction) orthogonal to the Z-axis direction in the plane, but also in the rotation direction (Zθ direction) about the Z-axis. The light modulation device can be adjusted with high accuracy.

  In the optical device manufacturing apparatus of the present invention, the pattern forming unit sets at least each pixel positioned at the outer edge to a predetermined brightness in a rectangular region including the adjustment region in the image forming region of the light modulation device. And the display pixel is a pixel positioned at a corner of the rectangular area, and the control device has a first reference corresponding to the vicinity of the edge of the window pattern. A reference pattern storage unit storing a pattern and a second reference pattern corresponding to the vicinity of a corner of the window pattern, and a reference pattern stored in the reference pattern storage unit in a captured image captured by the imaging device A pattern determination unit that determines whether or not the image is present, and the pattern determination unit includes the first reference pattern in the captured image. If determined, the movement direction of the light modulation device is determined, and the position adjustment device is driven and controlled until the pattern determination unit determines that the second reference pattern exists in the captured image. And a coarse adjustment control unit that moves the light modulation device in the movement direction.

By the way, when the corresponding area corresponding to the display pixel of the 1-dot pattern is not located in the imaging area of the imaging device at the initial stage of performing the alignment adjustment, the above-described center-of-gravity position calculating step, deviation calculating step, and The adjustment control step cannot be executed.
In the present invention, the pattern forming unit is configured to be able to form a window pattern in the light modulation device. Further, the control device includes a reference pattern storage unit, a pattern determination unit, and a coarse adjustment control unit. Accordingly, if the rough alignment adjustment described below is performed before the above-described center-of-gravity position calculation step, deviation calculation step, and adjustment control step are performed, the corresponding region corresponding to the display pixel of the one-dot pattern is imaged. The center-of-gravity position calculation step, the deviation calculation step, and the adjustment control step described above can be suitably performed.

First, the pattern forming unit forms a window pattern on the light modulation device and displays a projected image of the window pattern on the screen.
Next, the pattern determination unit determines whether or not the reference pattern stored in the reference pattern storage unit exists in the captured image captured by the imaging device (pattern matching process).
The coarse adjustment control unit determines that the pattern determination unit determines that the first reference pattern corresponding to the vicinity of the edge of the window pattern exists in the captured image, that is, the corner of the window pattern is within the imaging region. If the edge of the window pattern is positioned within the imaging region, the plane position of the light modulation device is predicted and the movement direction of the light modulation device is determined. The coarse adjustment control unit then determines that the pattern determination unit determines that the second reference pattern corresponding to the vicinity of the corner of the window pattern exists in the captured image, that is, the corner of the window pattern (one dot pattern). The position adjustment device is driven and controlled to move the light modulation device in the moving direction until the position of the corresponding region corresponding to the display pixel is positioned in the imaging region.
When the rough alignment adjustment as described above is performed, the corresponding area corresponding to the display pixel of the 1-dot pattern is not located in the imaging area, and the edge of the window pattern is located in the imaging area In addition, the light modulation device can be quickly moved to the position where the corresponding region is located in the imaging region, and the alignment time of the light modulation device can be smoothly adjusted to shorten the manufacturing time of the optical device.

  In the optical device manufacturing apparatus of the present invention, the window pattern is a pattern in which each pixel positioned at an outer edge in the rectangular region and each pixel positioned in the rectangular region are set to a predetermined brightness, The control device includes a brightness calculation unit that calculates the brightness of the captured image based on each luminance value for each pixel in the captured image captured by the imaging device, and the coarse adjustment control unit includes the pattern Based on the brightness calculated by the brightness calculation unit when it is determined by the determination unit that both the first reference pattern and the second reference pattern are not present in the captured image. Determining the moving direction of the light modulation device, and driving and controlling the position adjustment device until the pattern determination unit determines that the second reference pattern exists in the captured image. It is preferable to move the light modulation device in the moving direction.

By the way, the coarse alignment adjustment described above is configured such that the light modulation device can be moved to a position where the corresponding area is located in the imaging area only when the edge of the window pattern is located in the imaging area. For this reason, when the edge of the window pattern is not located in the imaging area, the light modulation device cannot be moved to a position where the corresponding area is located in the imaging area.
In the present invention, since the window pattern is configured as described above and the control device includes the brightness calculation unit, the edge of the window pattern is not located in the imaging region as described below. However, it is possible to perform rough alignment adjustment in which the light modulation device is moved to a position where the corresponding region is located in the imaging region.
That is, when the pattern determination unit determines that both the first reference pattern and the second reference pattern are not present in the captured image, the coarse adjustment control unit determines the brightness of the captured image calculated by the brightness calculation unit. Recognize For example, when the inside of the window pattern is located within the imaging area, the brightness of the captured image is relatively large, and when the outside of the window pattern is located within the imaging area, Since the brightness is relatively small, the coarse adjustment control unit predicts the planar position of the light modulation device based on the brightness of the captured image calculated by the brightness calculation unit, and the light modulation device Determine the direction of movement. The coarse adjustment control unit then determines that the second reference pattern is present in the captured image by the pattern determination unit, that is, the corner of the window pattern (the corresponding region corresponding to the display pixel of the one-dot pattern). The position adjusting device is driven and controlled to move the light modulation device in the moving direction until the (position) is positioned within the imaging region.
By performing the coarse alignment adjustment as described above, the light modulation device can be moved to a position where the corresponding area is located in the imaging area even when the edge of the window pattern is not located in the imaging area. Thus, it is possible to suitably achieve the effect that the alignment adjustment of the light modulation device described above can be smoothly performed and the manufacturing time of the optical device can be shortened.

The position adjustment method of the present invention includes a plurality of light modulation devices that form image light by modulating a plurality of color lights according to image information for each color light, and each image light formed by the plurality of light modulation devices. A position adjustment method used in an optical apparatus manufacturing apparatus that manufactures an optical apparatus including a color combining optical apparatus for combining, in an adjustment area used for position adjustment in an image forming area of the light modulation device, Based on a pattern forming step for causing the light modulation device to form a one-dot pattern in which only one display pixel is set to a predetermined brightness, and each luminance value for each pixel in a captured image captured by the imaging device A centroid position calculating step of calculating a centroid position of a corresponding region corresponding to the display pixel in the image; a deviation calculating step of calculating a deviation of the centroid position and a preset reference position; Based on the serial deviation, drives and controls the position adjustment device, characterized in that it comprises an adjustment control step of causing positioning said light modulation device in a predetermined position relative to the color combining optical device.
Since the position adjusting method of the present invention is a method used in the above-described optical device manufacturing apparatus, it can enjoy the same operations and effects as the above-described optical device manufacturing apparatus.

  The position adjustment program of the present invention includes a plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light to form image light, and each image light formed by the plurality of light modulation devices. A position adjustment program used in an optical apparatus manufacturing apparatus for manufacturing an optical apparatus including a color combining optical apparatus to be combined, wherein the computer executes the position adjustment method described above.

The recording medium of the present invention is characterized in that the above-described position adjustment program is recorded in a computer-readable manner.
Since the position adjustment program and the recording medium configured as described above are used to implement the position adjustment method described above, the same operations and effects as those of the position adjustment method described above can be enjoyed.
Further, since the position adjustment program described above is recorded on the recording medium, the handling of the program becomes easy.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[1. Projector configuration)
FIG. 1 is a diagram schematically showing a structure of a projector 100 including an optical device to be manufactured.
The projector 100 modulates the light beam emitted from the light source according to image information to form a color image, and enlarges and projects the formed color image on a screen (not shown). As shown in FIG. 1, the projector 100 is roughly composed of an outer casing 100A and an optical unit 100B.
Although not specifically shown in FIG. 1, in the exterior casing 100A, in addition to the optical unit 100B, a cooling unit including a cooling fan that cools each component in the projector 100, and the projector A control device or the like for controlling each component in the 100 is disposed.

  The optical unit 100B optically processes the light beam emitted from the light source under the control of the control device to form a color image corresponding to the image signal (image information), and enlarges it on the screen Sc (see FIG. 2). Project. As shown in FIG. 1, the optical unit 100B includes a light source device 110 having a light source lamp 111, a reflector 112, and the like, an illumination optical device 120 having lens arrays 121 and 122, a polarization conversion element 123, a superimposing lens 124, and the like. A color separation optical device 130 having dichroic mirrors 131 and 132, a reflection mirror 133, and the like; a relay optical device 140 having an incident side lens 141, a relay lens 142, reflection mirrors 143 and 144, and the like; Three liquid crystal panels 151 (the liquid crystal panel for red light is 151R, the liquid crystal panel for green light is 151G, and the liquid crystal panel for blue light is 151B), three incident side polarizing plates 152, three outgoing side polarizing plates 153 and a cross dichroic prism 154 as a color synthesis optical device It includes an optical device 150 having a projection lens 160 as a projection optical device and an optical component casing 170 disposed at a predetermined position with respect to these illumination optical axis A of the optical components 110 to 160 are set therein.

In the following description, in each of the optical components 110 to 160, the optical components 110 to 140 are used as an optical system for various general projectors. Only the projection lens 160 will be described.
The three incident-side polarizing plates 152 transmit only polarized light having substantially the same polarization direction as the polarization direction aligned by the polarization conversion element 123 among the light beams separated by the color separation optical device 130, and other light beams. The polarizing film is affixed on the translucent substrate.
The three liquid crystal panels 151 have a configuration in which a liquid crystal, which is an electro-optical material, is hermetically sealed in a pair of transparent glass substrates, and the alignment state of the liquid crystal is controlled according to a drive signal from the control device, The polarization direction of the polarized light beam emitted from the incident side polarizing plate 152 is modulated.

The three exit-side polarizing plates 153 have substantially the same function as the incident-side polarizing plate 152 and transmit polarized light in a certain direction among the light beams emitted through the liquid crystal panel 151 and absorb other light beams. To do.
The cross dichroic prism 154 synthesizes each color light modulated for each color light emitted from the emission side polarizing plate 153 to form a color image. The cross dichroic prism 154 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films are emitted from the liquid crystal panel 151G facing the projection lens 160 and transmit color light (image light) through the emission side polarizing plate 153, and are emitted from the other liquid crystal panels 151R and 151B and emitted side polarized light. Each color light (image light) through the plate 153 is reflected. In this way, each color light (each image light) is combined to form a color image.

  Although not specifically shown, among the members 151 to 154 constituting the optical device 150 described above, the three liquid crystal panels 151, the three exit-side polarizing plates 153, and the cross dichroic prism 154 are the cross dichroic prism 154. The optical device main body 150A is configured to be fixed in a state of being opposed to the respective light beam incident side end faces 154A (FIG. 1). Here, the configuration is not limited to the configuration in which the three liquid crystal panels 151 and the three exit side polarizing plates 153 are directly fixed to the light incident side end face 154A, but the three liquid crystal panels 151 and the three exit side polarizing plates 153 It may be configured to be fixed to the light incident side end face 154A via a member (such as a translucent substrate or a holding member that holds the optical elements 151 and 153). Further, the optical device main body 150A may employ a configuration in which the three incident side polarizing plates 152 are integrated in addition to the three liquid crystal panels 151, the three exit side polarizing plates 153, and the cross dichroic prism 154.

  In the optical device main body 150A having the above-described structure, the focus adjustment, alignment adjustment, and fixing of each liquid crystal panel 151 are performed when each liquid crystal panel 151 is fixed to each light beam incident side end surface 154A of the cross dichroic prism 154. Therefore, a manufacturing apparatus capable of performing focus adjustment, alignment adjustment, and fixing of each liquid crystal panel 151 is required. The configuration of the manufacturing apparatus will be described later.

  The projection lens 160 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel, and enlarges and projects the color image emitted from the cross dichroic prism 154 onto the screen Sc.

[2. Configuration of optical device body manufacturing apparatus]
FIG. 2 is a diagram schematically illustrating a schematic configuration of the manufacturing apparatus 1 of the optical apparatus main body 150A.
As shown in FIG. 2, the manufacturing apparatus 1 is roughly composed of a screen Sc, three six-axis position adjusting devices 10 as position adjusting devices, an adjustment light source device 20, an imaging device 30, a control device 40, and the like. Has been.
The screen Sc is configured as a so-called transmission screen that transmits and projects incident image light, and the optical device main body 150A and the projection lens 160 to be manufactured are installed at predetermined positions inside the manufacturing device 1, The image light formed by the liquid crystal panel 151 and enlarged and projected by the projection lens 160 via the cross dichroic prism 154 is projected and displayed. The screen Sc is not limited to a transmissive screen, and may be configured as a so-called reflective screen that reflects and projects incident image light.

  As shown in FIG. 2, the three six-axis position adjusting devices 10 face each light beam incident side end surface 154 </ b> A (the emission side polarizing plate 153 is attached) of the cross dichroic prism 154 installed at a predetermined position inside the manufacturing apparatus 1. The position of each liquid crystal panel 151 with respect to each light beam incident side end face 154A is adjusted while holding each liquid crystal panel 151 from the light beam incident side. Although not specifically shown, the 6-axis position adjusting device 10 is configured to approach and separate from the light incident side end surface 154A (hereinafter referred to as the Z-axis direction), and to the biaxial direction orthogonal to the Z-axis (X-axis direction ( In FIG. 2, the direction parallel to the paper surface, the Y-axis direction (the direction perpendicular to the paper surface in FIG. 2), the rotation direction around the Z axis (hereinafter referred to as Zθ direction), and the rotation direction around the X axis ( Hereinafter, it is configured to be movable in the Xθ direction) and in a rotation direction around the Y axis (hereinafter referred to as the Yθ direction), and the 6-axis position adjusting device 10 is driven by a control device 40 such as a motor (not shown). The position of the held liquid crystal panel 151 is adjusted in the X axis direction, the Y axis direction, the Z axis direction, the Xθ direction, the Yθ direction, and the Zθ direction with respect to the light incident end surface 154A.

  The adjustment light source device 20 is a light source of a position adjusting light beam used for adjusting the position of the liquid crystal panel 151 in the six-axis position adjustment device 10. For example, a discharge light emitting lamp such as a metal halide lamp, an LED (Light Emitting Diode), or the like. ) And the like, and is driven (lighted) under the control of a light source driving circuit (not shown) by the control device 40. Then, the adjustment light source device 20 supplies the respective R, G, and B color lights to the three six-axis position adjustment devices 10, and the respective liquid crystal panels 151 R and 151 G from the tip portions of the six-axis position adjustment devices 10. , 151B are irradiated to the liquid crystal panels 151 respectively.

The imaging device 30 is formed by the liquid crystal panel 151 under the control of the control device 40, and is projected onto the screen Sc by the projection lens 160 through the cross dichroic prism 154 and is projected onto the screen Sc (FIG. 2). ). As shown in FIG. 2, the imaging device 30 includes four CCD cameras 31.
FIG. 3 is a diagram schematically showing the arrangement position of each CCD camera 31.
Each CCD camera 31 is an area sensor using a CCD as an image sensor, captures a projected image F displayed on the screen Sc, and outputs a signal corresponding to the captured image to the control device 40. More specifically, each CCD camera 31 is arranged on the back side of the screen Sc (the side opposite to the side on which image light is projected). Further, as shown in FIG. 3, each CCD camera 31 has a screen corresponding to a rectangular area Ar1 including a window pattern and a one-dot pattern, which will be described later, formed on the liquid crystal panel 151 when the alignment of the liquid crystal panel 151 is adjusted. The rectangular areas Ar1 ′ displayed in Sc are arranged in a state of being separated from each other corresponding to the corner positions C1 to C4 of the four corners.
In the following, when viewed from the back side of the screen Sc, the CCD camera 31 disposed at the upper left is referred to as a first CCD camera 31A, and the CCD camera 31 disposed at the upper right is referred to as a second CCD camera 31B, and disposed at the lower left. The CCD camera 31 to be used is a third CCD camera 31C, and the CCD camera 31 disposed in the lower right is a fourth CCD camera 31D.

FIG. 4 is a block diagram illustrating a schematic configuration of the control device 40.
The control device 40 is composed of a computer having a CPU (Central Processing Unit) and a hard disk, and controls the entire manufacturing apparatus 1 by executing various programs. As shown in FIG. 4, the control device 40 includes an operation unit 41, a display unit 42, a control unit 43, and the like.
The operation unit 41 includes various operation buttons (not shown) that are input with a keyboard and a mouse, for example. By performing the input operation of the operation buttons, the control device 40 is appropriately operated, and for example, the operation content of the control device 40 is set for the information displayed on the display unit 42. Then, a predetermined operation signal is appropriately output from the operation unit 41 to the control unit 43 by an input operation of the operation unit 41 by the operator.

  The display unit 42 is controlled by the control unit 43 and displays a predetermined image. For example, it is output from the control unit 43 when setting or inputting information to be stored in a memory described later of the control unit 43 by displaying an image processed by the control unit 43 or by an input operation of the operation unit 41. The data in the memory is displayed as appropriate.

The control unit 43 is configured as a program developed on an OS (Operating System) that controls the CPU. The control unit 43 executes a predetermined program in response to an input of an operation signal from the operation unit 41, and the entire manufacturing apparatus 1 and the liquid crystal display. The panel 151 is driven and controlled. As shown in FIG. 4, the control unit 43 includes a control unit main body 431 and a memory 432 as a reference pattern storage unit.
The control unit main body 431 is a part that executes predetermined processing in accordance with a program stored in the memory 432, and as shown in FIG. 4, a pattern forming unit 433, a captured image data acquisition unit 434, and a focus adjustment unit 435. And an alignment adjustment unit 436 and the like.

FIG. 5 is a diagram schematically showing various patterns formed on the liquid crystal panel 151.
The pattern forming unit 433 outputs a predetermined drive signal to the liquid crystal panel 151 and causes the liquid crystal panel 151 to form images of various patterns.
For example, as shown in FIG. 5, the pattern forming unit 433 uses a window pattern PW (see FIG. 5B) in a predetermined rectangular area Ar1 in the image forming area Arf as a pattern for performing alignment adjustment of the liquid crystal panel 151. ) And a one-dot pattern PD (FIG. 5C).

The window pattern PW is a pattern used when the rough alignment adjustment of the liquid crystal panel 151 is performed. As shown in FIG. 5B, all pixels in the rectangular area Ar1 have a predetermined brightness (white display (white display (white display)). ), And all other pixels except for the rectangular area Ar1 in the image forming area Arf are displayed in black (tone value indicating black).
The 1-dot pattern PD is a pattern used when fine alignment adjustment of the liquid crystal panel 151 is performed. As shown in FIG. 5C, corner portions of the rectangular adjustment areas Ar2 at the four corners of the rectangular area Ar1. This is an image in which each display pixel Px located in (the four corners of the rectangular area Ar1) is displayed in white and all other pixels except for the display pixels Px in the image forming area Arf are displayed in black.

Further, for example, as shown in FIG. 5, the pattern forming unit 433 forms a focus adjustment pattern PF (see FIG. 5) in a predetermined rectangular area Ar3 in the image forming area Arf as a pattern for performing the focus adjustment of the liquid crystal panel 151. 5 (D)). The rectangular area Ar3 is set as shown below.
That is, the rectangular area Ar3 is set to be larger than the above-described rectangular area Ar1 (FIG. 5A), and a rectangular area Ar3 ′ (FIG. 3) displayed on the screen Sc corresponding to the rectangular area Ar3. The four CCD cameras 31 are set so as to cover the arrangement positions.
As shown in FIG. 5D, the focus adjustment pattern PF displays all pixels in the rectangular area Ar3 as white display and black display every other pixel along the vertical and horizontal directions. This is an image in which all the pixels other than the rectangular area Ar3 in Arf are displayed in black (tone value indicating black).

  The captured image data acquisition unit 434 outputs a predetermined control signal to each CCD camera 31 and causes each CCD camera 31 to capture the projection image F displayed on the screen Sc. The captured image data acquisition unit 434 receives an electrical signal output from each CCD camera 3 and converts it into a signal (digital signal) that can be read by a computer. Captured image data including information on a pixel value (gradation value, luminance value) having a tone of 256) is acquired. Then, the captured image data acquisition unit 434 outputs the acquired captured image data to the focus adjustment unit 435 and the alignment adjustment unit 436.

The focus adjustment unit 435 adjusts the focus of the liquid crystal panel 151 based on each captured image data output from the captured image data acquisition unit 434 when the projection image F of the focus adjustment pattern PF is displayed on the screen Sc. carry out. Specifically, the focus adjustment unit 435 performs predetermined image processing on each captured image data, and based on the processing result, the focus position of the liquid crystal panel 151 (the Z-axis direction, the Xθ direction of the liquid crystal panel 151, and the (Each position in the Yθ direction) is calculated. Then, the focus adjustment unit 435 drives and controls the 6-axis position adjustment device 10 via a drive unit such as a motor, and performs focus adjustment for positioning the liquid crystal panel 151 at the calculated focus position.
The focus position refers to the respective captured images in the four corner areas of the projected images F captured by the four CCD cameras 31 when the projected image F of the focus adjustment pattern PF is displayed on the screen Sc. It means the position of the liquid crystal panel 151 in a state.

The alignment adjustment unit 436 uses the liquid crystal panel 151 based on each captured image data output from the captured image data acquisition unit 434 when the projected image F of the window pattern PW or 1-dot pattern PD is displayed on the screen Sc. Perform alignment adjustment. Specifically, the alignment adjustment unit 436 performs predetermined image processing on each captured image data, and based on the processing result, the alignment position of the liquid crystal panel 151 (the X axis direction, the Y axis direction of the liquid crystal panel 151, Each position in the Zθ direction) is calculated. Then, the alignment adjustment unit 436 drives and controls the 6-axis position adjustment device 10 via a drive unit such as a motor, and positions the liquid crystal panel 151 at the calculated alignment position.
The alignment position means the position of the liquid crystal panel 151 where the pixels of the liquid crystal panels 151R, 151G, and 151B substantially match.

As shown in FIG. 4, the alignment adjustment unit 436 includes a coarse adjustment unit 4361 and a fine adjustment unit 4362.
The coarse adjustment unit 4361 performs coarse alignment adjustment of the liquid crystal panel 151 based on each captured image data output from the captured image data acquisition unit 434 when the projection image F of the window pattern PW is displayed on the screen Sc. To do. Specifically, the coarse adjustment unit 4361 is arranged via a drive unit such as a motor so that each captured image data includes the angular positions C1 to C4 (FIG. 5) of the four corners of the projection image F of the window pattern PW. The six-axis position adjusting device 10 is driven and controlled, and the liquid crystal panel 151 is moved. As shown in FIG. 4, the coarse adjustment unit 4361 includes a pattern determination unit 4361A, a brightness calculation unit 4361B, and a coarse adjustment control unit 4361C.

The pattern determination unit 4361A performs pattern matching processing on the captured image data and the reference pattern stored in the memory 432, and determines whether or not the reference pattern exists in the captured image data.
FIG. 6 is a diagram schematically showing the reference pattern. Specifically, FIG. 6A shows a reference pattern corresponding to the first CCD camera 31A. FIGS. 6B to 6D show reference patterns corresponding to the second CCD camera 31B, the third CCD camera 31C, and the fourth CCD camera 31D, respectively.

Here, the reference pattern is a pattern used when pattern matching processing is performed. As shown in FIG. 6, two first reference patterns PS1H and PS1V and one corresponding to each CCD camera 31 are provided. A second reference pattern PS2 is set for each.
Specifically, the two first reference patterns PS1HA and PS1VA and the second reference pattern PS2A corresponding to the first CCD camera 31A are as follows.
That is, as shown in FIG. 6A, the first reference pattern PS1HA corresponds to the vicinity of the upper edge E1 (FIG. 3) extending in the horizontal direction of the projection image F (rectangular area Ar1 ′) of the window pattern PW. This is the reference pattern.
As shown in FIG. 6A, the first reference pattern PS1VA is a reference pattern corresponding to the vicinity of the left edge E2 (FIG. 3) extending in the vertical direction of the rectangular area Ar1 ′.
As shown in FIG. 6A, the second reference pattern PS2A is a reference pattern corresponding to the vicinity of the corner position C1 of the rectangular area Ar1 ′.

The two first reference patterns PS1HB and PS1VB and the second reference pattern PS2B corresponding to the second CCD camera 31B are as follows.
That is, the first reference pattern PS1HB is the same pattern as the first reference pattern PS1HA described above, as shown in FIG. 6B.
As shown in FIG. 6B, the first reference pattern PS1VB is a reference pattern corresponding to the vicinity of the right edge E3 (FIG. 3) extending in the vertical direction of the rectangular area Ar1 ′.
As shown in FIG. 6B, the second reference pattern PS2B is a reference pattern corresponding to the vicinity of the corner position C2 of the rectangular area Ar1 ′.

The two first reference patterns PS1HC and PS1VC and the second reference pattern PS2C corresponding to the third CCD camera 31C are as follows.
That is, as shown in FIG. 6C, the first reference pattern PS1HC is a reference pattern corresponding to the vicinity of the lower edge E4 (FIG. 3) extending in the horizontal direction of the rectangular area Ar1 ′.
As shown in FIG. 6C, the first reference pattern PS1VC is the same pattern as the first reference pattern PS1VA described above.
As shown in FIG. 6C, the second reference pattern PS2C is a reference pattern corresponding to the vicinity of the corner position C3 of the rectangular area Ar1 ′.

The two first reference patterns PS1HD and PS1VD and the second reference pattern PS2D corresponding to the fourth CCD camera 31D are as follows.
That is, the first reference pattern PS1HD is the same pattern as the first reference pattern PS1HC described above, as shown in FIG.
As shown in FIG. 6D, the first reference pattern PS1VD is the same pattern as the first reference pattern PS1VB described above.
As shown in FIG. 6D, the second reference pattern PS2D is a reference pattern corresponding to the vicinity of the corner position C4 of the rectangular area Ar1 ′.

  The brightness calculation unit 4361B calculates the brightness of the captured image captured by the CCD camera 31 based on the luminance value for each pixel in the captured image data. As the brightness, for example, an average value of luminance values of all pixels in the captured image data can be adopted.

When the pattern determination unit 4361A determines that the first reference patterns PS1H and PS1V are present in the captured image data, the coarse adjustment control unit 4361C determines the moving direction of the liquid crystal panel 151, and the pattern determination unit 4361A Until it is determined that the second reference pattern PS2 is present in the captured image data, the six-axis position adjusting device 10 is driven and controlled via a driving unit such as a motor to move the liquid crystal panel 151 in the moving direction.
The coarse adjustment control unit 4361C calculates brightness when the pattern determination unit 4361A determines that both the first reference patterns PS1H and PS1V and the second reference pattern PS2 do not exist in the captured image data. The moving direction of the liquid crystal panel 151 is determined based on the brightness calculated by the unit 4361B, and the motor or the like until the pattern determining unit 4361A determines that the second reference pattern PS2 exists in the captured image data. The six-axis position adjusting device 10 is driven and controlled via the driving unit to move the liquid crystal panel 151 in the moving direction.

  The fine adjustment unit 4362 performs fine alignment adjustment of the liquid crystal panel 151 based on each captured image data output from the captured image data acquisition unit 434 when the projected image F of the 1-dot pattern PD is displayed on the screen Sc. carry out. Specifically, fine adjustment unit 4362 calculates the alignment position of liquid crystal panel 151 based on each captured image data. The fine adjustment unit 4362 controls the driving of the 6-axis position adjustment device 10 via a drive unit such as a motor, and positions the liquid crystal panel 151 at the calculated alignment position. As shown in FIG. 4, the fine adjustment unit 4362 includes a gravity center position calculation unit 4362A, a deviation calculation unit 4362B, and a fine adjustment control unit 4362C as an adjustment control unit.

The center-of-gravity position calculation unit 4362A calculates the center-of-gravity position of the corresponding region corresponding to the display pixel Px in the captured image data based on each luminance value for each pixel in the captured image data.
Deviation calculation unit 4362B calculates the deviation between the center of gravity position calculated by center of gravity position calculation unit 4362A and the reference position (the center position in the imaging region of CCD camera 31).
Fine adjustment control unit 4362C calculates the alignment position of liquid crystal panel 151 based on the four deviations calculated by deviation calculation unit 4362B. Fine adjustment control unit 4362C drives and controls 6-axis position adjustment device 10 via a drive unit such as a motor, and positions liquid crystal panel 151 at the calculated alignment position.

The memory 432 stores a predetermined program (including a position adjustment program), model data corresponding to the model of the projector, information processed by the control unit main body 431, and the like.
Here, as the model data, for example, each reference pattern (each first reference pattern PS1H, each first reference pattern PS1V, and each second reference) according to the model of the projector, that is, the model of the optical device main body 150A. Data relating to the reference pattern PS2), data relating to the threshold (hereinafter referred to as brightness threshold) used in the coarse adjustment control unit 4361C, data relating to the threshold used in the center-of-gravity position calculating unit 4362A (hereinafter referred to as luminance threshold), and optical device main body 150A There are initial position data (data on coordinate values) of each liquid crystal panel 151 constituting the.

[3. (Position adjustment method)
Next, a manufacturing method of the optical device main body 150A by the manufacturing apparatus 1 described above will be described with reference to the drawings.
In the following, a method for adjusting the position of each liquid crystal panel 151 with respect to the cross dichroic prism 154 will be mainly described, and the description of the rest (such as a fixing method) will be omitted.
FIG. 7 is a flowchart illustrating a method for adjusting the position of the liquid crystal panel 151.
First, the operator installs the cross dichroic prism 154 to which each emission-side polarizing plate 153 is attached and the projection lens 160 at predetermined positions in the manufacturing apparatus 1. Each liquid crystal panel 151 is held by each 6-axis position adjusting device 10.
Next, the operator operates the operation unit 41 of the control device 40 and performs an input operation for manufacturing the optical device main body 150A. The control unit main body 431 reads a program (including a position adjustment program) stored in the memory 432 and starts manufacturing (position adjustment) of the optical device main body 150A as shown below.

First, the control unit main body 431 performs focus adjustment of the liquid crystal panel 151G as described below according to the position adjustment program (step S1).
FIG. 8 is a flowchart for explaining focus adjustment.
First, the focus adjustment unit 435 reads design coordinate values (initial position data) of the liquid crystal panel 151G included in the model data stored in the memory 432, and the 6-axis position adjustment device 10 via a drive unit such as a motor. Is controlled to install the liquid crystal panel 151G at the initial position (step S1A).
After step S1A, the control unit main body 431 drives and controls the adjustment light source device 20 via the light source drive circuit, and irradiates the liquid crystal panel 151G with G-color light (step S1B).

  After step S1B, the pattern forming unit 433 outputs a predetermined drive signal to the liquid crystal panel 151G to form the focus adjustment pattern PF on the liquid crystal panel 151G (step S1C). The focus adjustment pattern PF formed by the liquid crystal panel 151G is enlarged and projected onto the screen Sc by the projection lens 160 via the cross dichroic prism 154, and the projection image F of the focus adjustment pattern PF is formed on the screen Sc. Is displayed.

After step S1C, the captured image data acquisition unit 434 outputs a predetermined control signal to each CCD camera 31, and the corners of the four corners of the projection image F (rectangular area Ar3 ') of the focus adjustment pattern PF are output to each CCD camera 31. Each part is imaged (step S1D).
FIG. 9 is a diagram illustrating a captured image Fg (imaging region PAr) captured by each CCD camera 31. Specifically, FIG. 9A is a diagram illustrating a captured image FgA captured by the first CCD camera 31A. FIGS. 9B to 9D are diagrams illustrating captured images FgB to FgD captured by the second CCD camera 31B, the third CCD camera 31C, and the fourth CCD camera 31D, respectively.
As described above, since the rectangular area Ar3 ′ is set so as to cover the arrangement positions of the four CCD cameras 31, the four CCD cameras 31 are arranged as shown in FIGS. The four corner areas of the focus adjustment pattern PF are imaged. Then, the captured image data acquisition unit 434 outputs each captured image data related to the captured image captured by each CCD camera 31 to the focus adjustment unit 435.

After step S1D, the focus adjustment unit 435 calculates an index value related to the contrast of the four captured images FgA to FgD based on the luminance value for each pixel in the four captured image data (step S1E). Then, the focus adjustment unit 435 stores the calculated four index values in the memory 432 according to the displacement position (position in the Z-axis direction) of the liquid crystal panel 151G.
Note that the index value relating to contrast may be an index value indicating the sharpness of the captured images FgA to FgD. For example, the index value is calculated based on the maximum luminance value and the minimum luminance value of all the pixels in the captured image data. A value (contrast value) may be adopted as an index value, or a variation in luminance values of a plurality of pixels within a predetermined area in a captured image, that is, a variance value (σ ² ) of luminance values is adopted as an index value. May be.

After step S1E, the focus adjustment unit 435 checks the information stored in the memory 432, and determines whether or not index values have been calculated at all displacement positions (for example, five displacement positions) (step S1F). .
In step S1F, when the focus adjustment unit 435 determines “N”, that is, when it is determined that the index values are not calculated at all the displacement positions, the six axes are connected via a drive unit such as a motor. The position adjustment device 10 is driven and controlled, the liquid crystal panel 151G is moved by a predetermined displacement amount in the Z-axis direction, and the liquid crystal panel 151G is moved to the next displacement position (step S1G). Then, the above-described steps S1D and S1E are performed to calculate the index value.

Then, as a result of repeatedly performing the above-described processes S1D to S1G, the focus adjustment unit 435 determines that “Y” is determined in process S1F, that is, if it is determined that index values have been calculated at all displacement positions. Reads out information stored in the memory 432, and the index values of the captured images FgA to FgD corresponding to the four corner areas of the projection image F are substantially equal based on the four index values corresponding to the displacement positions. And the position (focus position) at which the captured image FgA to FgD is in focus is calculated (step S1H).
After step S1H, the focus adjustment unit 435 drives and controls the six-axis position adjustment device 10 via a drive unit such as a motor, and moves the liquid crystal panel 151G in the Z-axis direction, the Xθ direction, and the Yθ direction, thereby liquid crystal. The panel 151G is positioned at the focus position (step S1I).

After step S1, the control unit main body 431 performs alignment adjustment as described below according to the position adjustment program (step S2). In the following processing, step S1B is continuously performed, and the G color light is irradiated to the liquid crystal panel 151G.
First, the control unit main body 431 performs rough alignment adjustment of the liquid crystal panel 151G as described below (step S21).

FIG. 10 is a flowchart for explaining the rough alignment adjustment.
FIG. 11 is a diagram for explaining the rough alignment adjustment.
The pattern forming unit 433 outputs a predetermined drive signal to the liquid crystal panel 151G to form the window pattern PW on the liquid crystal panel 151G (step S21A). The window pattern PW formed by the liquid crystal panel 151G is enlarged and projected onto the screen Sc by the projection lens 160 via the cross dichroic prism 154, and the projection image F of the window pattern PW is displayed on the screen Sc.
Here, even when the liquid crystal panel 151G is positioned at a desired focus position in step S1, the positions of the liquid crystal panel 151G in the X axis direction, the Y axis direction, and the Zθ direction are deviated from the desired alignment positions. For example, as shown in FIG. 11, the corner positions C1 to C4 of the rectangular area Ar1 ′ of the window pattern PW may be shifted from the arrangement positions of the CCD cameras 31. In such a case, the CCD cameras 31 cannot capture the angular positions C1 to C4. That is, the corresponding area corresponding to each display pixel Px of the 1-dot pattern PD cannot be captured by each CCD camera 31. For this reason, the control part main body 431 cannot perform fine alignment adjustment of the liquid crystal panel 151G. Therefore, first, the rough alignment adjustment of the liquid crystal panel 151G is performed in step S21 to move the liquid crystal panel 151G to a position where each of the corner positions C1 to C4 can be imaged by each CCD camera 31, and then the liquid crystal panel in step S22. 151G fine alignment adjustment is performed.

  After step S21A, the captured image data acquisition unit 434 outputs a predetermined control signal to the CCD camera 31, and causes each CCD camera 31 to capture an image (step S21B). Then, the captured image data acquisition unit 434 outputs each captured image data related to the captured image captured by each CCD camera 31 to the alignment adjustment unit 436.

  FIG. 12 is a diagram showing the positional relationship of the projection image F (rectangular area Ar1 ′) of the window pattern PW with respect to the arrangement position of each CCD camera 31. As shown in FIG. Specifically, FIG. 12A is a diagram showing the positional relationship of the projection image F of the window pattern PW with respect to the arrangement position of the first CCD camera 31A. 12B to 12D are views showing the positional relationship of the projection image F of the window pattern PW with respect to the arrangement positions of the second CCD camera 31B, the third CCD camera 31C, and the fourth CCD camera 31D. In FIG. 12, the positional relationship of the projection image F of the window pattern PW with respect to the arrangement position of each CCD camera 31 is roughly divided into nine types of positional relationships R1 to R9. In FIG. 12, in order to simplify the description, the arrangement positions of the CCD cameras 31 are different, but the arrangement positions of the CCD cameras 31 are actually fixed.

After step S21B, the pattern determination unit 4361A performs pattern matching processing on the captured image data and the reference pattern stored in the memory 432 (step S21C).
After step S21C, the pattern determination unit 4361A determines whether or not the second reference pattern PS2 exists in the captured image data (step S21D).
For example, the pattern determination unit 4361A first performs Steps S21C and S21D based on the captured image data relating to the captured image captured by the first CCD camera 31A.
Here, the pattern determination unit 4361A has a positional relationship R1 shown in FIG. 12A with respect to the position of the projected image F of the window pattern PW with respect to the arrangement position of the first CCD camera 31A, that is, the first CCD camera 31A. In the state where the angular position C1 is located inside the imaging area PArA, the second reference pattern PS2A is present in the captured image data. Therefore, “Y” is determined in step S21D, and the process proceeds to step S21J.

On the other hand, in the case of the positional relationship R2 to R9 shown in FIG. 12A, that is, in the state where the angular position C1 is not located inside the imaging area PArA of the first CCD camera 31A, the pattern determination unit 4361A Since the second reference pattern PS2A does not exist, “N” is determined in step S21D.
If the pattern determination unit 4361A determines “N” in step S21D, the pattern determination unit 4361A determines whether or not the first reference patterns PS1H and PS1V exist in the captured image data (step S21E).

Here, in the case of the positional relationship R2 and R3 shown in FIG. 12A, the pattern determination unit 4361A, that is, the edge E1 or the edge E2 of the rectangular area Ar1 ′ is located inside the imaging area PArA of the first CCD camera 31A. In this state, since the first reference patterns PS1HA and PS1VA exist in the captured image data, “Y” is determined in step S21E.
When it is determined as “Y” in step S21E, the coarse adjustment control unit 4361C determines the moving direction of the liquid crystal panel 151G, and drives and controls the six-axis position adjusting device 10 via a driving unit such as a motor. Then, the liquid crystal panel 151G is moved in the moving direction by a predetermined displacement amount (step S21F). And it transfers to step S21B again.

For example, in the case of the positional relationship R2 shown in FIG. 12A, it can be predicted that the angular position C1 is positioned inside the imaging region PArA by moving the projection image F to the right. Therefore, when the pattern determination unit 4361A determines that the first reference pattern PS1HA is present in the captured image data, the coarse adjustment control unit 4361C moves the liquid crystal so as to move the projection image F to the right. The panel 151G is moved in the X direction.
Further, for example, in the case of the positional relationship R3 shown in FIG. 12A, it can be predicted that the angular position C1 is positioned inside the imaging region PArA by moving the projection image F downward. Therefore, when the pattern determination unit 4361A determines that the first reference pattern PS1VA exists in the captured image data, the coarse adjustment control unit 4361C moves the liquid crystal so as to move the projection image F downward. The panel 151G is moved in the Y direction.

On the other hand, the pattern determination unit 4361A has the positional relationship R4 to R9 shown in FIG. 12A, that is, the edge E1 or the edge E2 of the rectangular area Ar1 ′ is located inside the imaging area PArA of the first CCD camera 31A. If not, since the first reference patterns PS1HA and PS1VA do not exist in the captured image data, “N” is determined in step S21E.
If it is determined as “N” in step S21E, the brightness calculation unit 4361B calculates the brightness of the captured image based on the luminance value for each pixel in the captured image data (step S21G).

After step S21G, coarse adjustment control unit 4361C compares the brightness calculated by brightness calculation unit 4361B with the brightness threshold value stored in memory 432 (step S21H).
After step S21H, the coarse adjustment control unit 4361C determines the moving direction of the liquid crystal panel 151G based on the comparison result, and drives and controls the six-axis position adjustment device 10 via a driving unit such as a motor. 151G is moved in the moving direction by a predetermined displacement amount (step S21I). And it transfers to step S21B again.

For example, in the case of the positional relationship R4 shown in FIG. 12A, since the inside of the rectangular area Ar1 ′ is located inside the imaging area PArA, the brightness of the captured image is relatively large (brightness threshold value). Above). Further, it can be predicted that the angular position C1 and the edges E1 and E2 are positioned inside the imaging region PArA by moving the projection image F in the lower right direction. For this reason, when the coarse adjustment control unit 4361C determines that the brightness calculated by the brightness calculation unit 4361B is equal to or greater than the brightness threshold value, the liquid crystal so as to move the projection image F in the lower right direction. The panel 151G is moved.
For example, in the case of the positional relationships R5 to R9 shown in FIG. 12A, the brightness of the captured image is relatively small because the outside of the rectangular area Ar1 ′ is located inside the imaging area PArA. (Below brightness threshold). Further, it can be predicted that the angular position C1 and the edges E1 and E2 are positioned inside the imaging region PArA by moving the projection image F in the upper left direction. Therefore, when the coarse adjustment control unit 4361C determines that the brightness calculated by the brightness calculation unit 4361B is less than the brightness threshold value, the liquid crystal panel is configured to move the projection image F in the upper left direction. Move 151G.

Then, the above-described steps S21B to S21I are repeatedly performed until it is determined as “Y” in step S21D, that is, until the angular position C1 is located inside the imaging region PArA.
If it is determined as “Y” in step S21D, the above-described steps S21A to S21I are performed based on the respective captured image data relating to the captured images captured by the other CCD cameras 31B to 31D. It is determined whether or not the angular positions C2 to C4 are respectively located in the regions PArB, PArC, and PArD (FIGS. 12B to 12D) (step S21J).
If it is determined as “Y” in step S21J, the coarse alignment adjustment is terminated.

Steps S21A to S21I that are performed based on the captured image data relating to the captured images captured by the CCD cameras 31B to 31D will be briefly described below.
The rough alignment adjustment performed based on each captured image data regarding the captured image captured by the second CCD camera 31B is as follows.
That is, in the case of the positional relationship R1 shown in FIG. 12B, that is, in a state where the angular position C2 is located inside the imaging region PArB of the second CCD camera 31B, the second reference pattern is included in the captured image data. Since PS2B exists, “Y” is determined in step S21D.
In the case of the positional relationship R2 and R3 shown in FIG. 12B, that is, in the state where the edge E1 or the edge E3 of the rectangular area Ar1 ′ is located inside the imaging area PArB, Since the first reference patterns PS1HB and PS1VB exist, “Y” is determined in step S21E.

Here, in the case of the positional relationship R2 shown in FIG. 12B, it can be predicted that the angular position C2 can be positioned inside the imaging region PArB by moving the projection image F to the left, so that the coarse adjustment control unit In step S21F, 4361C moves the liquid crystal panel 151G in the X direction so as to move the projection image F in the left direction.
In the case of the positional relationship R3 shown in FIG. 12B, it is possible to predict that the angular position C2 is positioned inside the imaging region PArB by moving the projection image F downward, so that the coarse adjustment control unit 4361C In step S21F, the liquid crystal panel 151G is moved in the Y direction so that the projected image F is moved downward.

In the case of the positional relationships R4 to R9 shown in FIG. 12B, “N” is determined in step S21E.
Here, in the case of the positional relationship R4 shown in FIG. 12B, the brightness of the captured image is relatively large (above the brightness threshold), and the projected image F is moved to the lower left direction to move to the angular position. Since it can be predicted that C2 and the edges E1 and E3 are positioned inside the imaging region PArB, the coarse adjustment control unit 4361C moves the liquid crystal panel 151G so as to move the projection image F in the lower left direction in step S21I. .
In the case of the positional relationships R5 to R9 shown in FIG. 12B, the brightness of the captured image is relatively small (less than the brightness threshold value), and the projected image F is moved in the upper right direction to move to the angular position. Since it can be predicted that C2 and the edges E1 and E3 are positioned inside the imaging region PArB, the coarse adjustment control unit 4361C moves the liquid crystal panel 151G so as to move the projection image F in the upper right direction in step S21I. .

The coarse alignment adjustment performed based on each captured image data related to the captured image captured by the third CCD camera 31C is as follows.
That is, in the case of the positional relationship R1 shown in FIG. 12C, that is, in a state where the angular position C3 is located inside the imaging region PArC of the third CCD camera 31C, the second reference pattern is included in the captured image data. Since PS2C exists, it is determined as “Y” in step S21D.
In the case of the positional relationship R2 and R3 shown in FIG. 12C, that is, in the state where the edge E2 or the edge E4 of the rectangular area Ar1 ′ is located inside the imaging area PArC, Since the first reference patterns PS1HC and PS1VC exist, “Y” is determined in step S21E.

Here, in the case of the positional relationship R2 shown in FIG. 12C, it can be predicted that the angular position C3 is positioned inside the imaging region PArC by moving the projection image F in the right direction. In step S21F, 4361C moves the liquid crystal panel 151G in the X direction so as to move the projection image F in the right direction.
In the case of the positional relationship R3 shown in FIG. 12C, it can be predicted that the angular position C3 is positioned inside the imaging region PArC by moving the projection image F upward, so that the coarse adjustment control unit 4361C In step S21F, the liquid crystal panel 151G is moved in the Y direction so as to move the projection image F upward.

In the case of the positional relationships R4 to R9 shown in FIG. 12C, “N” is determined in step S21E.
Here, in the case of the positional relationship R4 shown in FIG. 12C, the brightness of the captured image is relatively large (above the brightness threshold), and the projected image F is moved in the upper right direction to move to the angular position. Since it can be predicted that C3 and the edges E2 and E4 are positioned within the imaging region PArC, the coarse adjustment control unit 4361C moves the liquid crystal panel 151G so as to move the projection image F in the upper right direction in step S21I. .
In the case of the positional relationships R5 to R9 shown in FIG. 12C, the brightness of the captured image is relatively small (less than the brightness threshold value), and the projected image F is moved in the lower left direction to move to the angular position. Since it can be predicted that C3 and the edges E2 and E4 are positioned within the imaging region PArC, the coarse adjustment control unit 4361C moves the liquid crystal panel 151G so as to move the projection image F in the lower left direction in step S21I. .

The coarse alignment adjustment performed based on each captured image data related to the captured image captured by the fourth CCD camera 31D is as follows.
That is, in the case of the positional relationship R1 shown in FIG. 12D, that is, in the state where the angular position C4 is located inside the imaging region PArD of the fourth CCD camera 31D, the second reference pattern is included in the captured image data. Since PS2D exists, “Y” is determined in step S21D.
In the case of the positional relationship R2 and R3 shown in FIG. 12D, that is, in the state where the edge E3 or the edge E4 of the rectangular area Ar1 ′ is located inside the imaging area PArD, Since the first reference patterns PS1HD and PS1VD exist, “Y” is determined in step S21E.

Here, in the case of the positional relationship R2 shown in FIG. 12D, it can be predicted that the angular position C4 is positioned inside the imaging region PArD by moving the projection image F in the left direction. In step S21F, 4361C moves the liquid crystal panel 151G in the X direction so as to move the projection image F in the left direction.
In the case of the positional relationship R3 shown in FIG. 12D, it is possible to predict that the angular position C4 is positioned inside the imaging region PArD by moving the projection image F upward, and thus the coarse adjustment control unit 4361C. In step S21F, the liquid crystal panel 151G is moved in the Y direction so as to move the projection image F upward.

In the case of the positional relationships R4 to R9 shown in FIG. 12D, “N” is determined in step S21E.
Here, in the case of the positional relationship R4 shown in FIG. 12D, the brightness of the captured image is relatively large (brightness threshold or more), and the projected image F is moved in the upper left direction to move to the angular position. Since it can be predicted that C4 and the edges E3 and E4 are positioned inside the imaging region PArD, the coarse adjustment control unit 4361C moves the liquid crystal panel 151G so as to move the projection image F in the upper left direction in step S21I. .
In the case of the positional relationships R5 to R9 shown in FIG. 12D, the brightness of the captured image is relatively small (less than the brightness threshold), and the projected image F is moved in the lower right direction to move to the angular position. Since it can be predicted that C3 and the edges E3 and E4 are positioned inside the imaging region PArD, the coarse adjustment control unit 4361C moves the liquid crystal panel 151G so as to move the projection image F in the lower right direction in step S21I. Let

After step S21, the control unit main body 431 performs fine alignment adjustment of the liquid crystal panel 151G as described below (step S22).
FIG. 13 is a flowchart for explaining fine alignment adjustment.
The pattern forming unit 433 outputs a predetermined drive signal to the liquid crystal panel 151G, and forms a one-dot pattern PD on the liquid crystal panel 151G (step S22A: pattern forming step). The 1-dot pattern PD formed on the liquid crystal panel 151G is enlarged and projected onto the screen Sc by the projection lens 160 via the cross dichroic prism 154, and the projected image F of the 1-dot pattern PD is displayed on the screen Sc. The

After step S22A, the captured image data acquisition unit 434 outputs a predetermined control signal to each CCD camera 31, and the corners of the four corners of the projected image F (rectangular area Ar1 ') of the one-dot pattern PD to each CCD camera 31. Are imaged (step S22B).
FIG. 14 is a diagram illustrating a captured image Fg (imaging region PAr) captured by each CCD camera 31. Specifically, FIG. 14A is a diagram illustrating a captured image FgA captured by the first CCD camera 31A. FIGS. 14B to 14D are diagrams illustrating captured images FgB to FgD captured by the second CCD camera 31B, the third CCD camera 31C, and the fourth CCD camera 31D, respectively.
Since the light formed by each display pixel Px in the liquid crystal panel 151G passes through the side away from the lens optical axis of the projection lens 160, it is affected by the lens characteristics (flare) of the projection lens 160. For this reason, in the projection image F, the display pixel Px is displayed so as to have a substantially elliptical shape instead of a rectangular shape, which is the original contour shape, as shown in FIG.

After step S22B, the center-of-gravity position calculation unit 4362A, based on the luminance value for each pixel in the four captured image data, stores the corresponding region Px ′ corresponding to the display pixel Px in each captured image data as shown below. A gravity center position is calculated (step S22C: gravity center position calculation step).
FIG. 15 is a diagram for explaining a method of calculating the centroid position by the centroid position calculation unit 4362A. Specifically, FIG. 15A is a diagram illustrating a captured image Fg (imaging region PAr) of the CCD camera 31. FIG. 15B is a diagram showing a luminance distribution on the line BB ′ in FIG.
The center-of-gravity position calculation unit 4362A uses the following equation (1) based on each luminance value for each pixel in the captured image data and the luminance threshold value BS (FIG. 15B) stored in the memory 432: The gravity center position GP (GPA to GPD (FIG. 14)) of the corresponding region Px ′ is calculated.

In the above equation (1), Xg represents a horizontal position in the captured image Fg at the center of gravity position GP, and Yg represents a vertical position in the captured image Fg at the center of gravity position GP. In addition, n indicates the number of pixels in the horizontal direction of the captured image Fg, and m indicates the number of pixels in the vertical direction of the captured image Fg. g (x, y) is a luminance threshold value BS from the luminance value f (x, y) when the luminance value at the horizontal pixel position x and the vertical pixel position y is f (x, y). The subtracted value is shown. Note that g (x, y) = 0 when the luminance value f (x, y) is equal to or smaller than the luminance threshold BS.
That is, the center-of-gravity position calculation unit 4362A compares each luminance value f (x, y) for each pixel in the captured image data with the luminance threshold BS, as shown in the above equation (1), and is equal to or higher than the luminance threshold BS. A corresponding area Px ′ (FIG. 15) constituted by each pixel having a luminance value is recognized. Then, the center-of-gravity position calculation unit 4362A calculates the center-of-gravity position GP (GPA to GPD) of the corresponding region Px ′ based on the above formula (1).

  After step S22C, the deviation calculation unit 4362B calculates the gravity center positions GPA to GPD calculated by the gravity center position calculation unit 4362A and the reference position SP (SPA to SPD (center positions of the imaging regions PArA to PArD)). Deviations (X-direction deviations XA to XD, Y-direction deviations YA to YD) are calculated (step S22D: deviation calculation step). Then, the deviation calculation unit 4362 </ b> B stores the calculated deviation in the memory 432.

After step S22D, fine adjustment control unit 4362C checks the information stored in memory 432, and determines whether or not deviations have been calculated for each of captured images FgA to FgD (step S22E).
If the fine adjustment control unit 4362C determines “Y” in step S22E, based on the deviations, the alignment positions of the liquid crystal panel 151 at which the gravity center positions GPA to GPD substantially match the reference positions SPA to SPD, respectively. (Each position in the X-axis direction, the Y-axis direction, and the Zθ direction) is calculated (step S22F). Then, fine adjustment control unit 4362C drives and controls 6-axis position adjustment device 10 via a drive unit such as a motor, and positions liquid crystal panel 151G at the calculated alignment position (step S22G: adjustment control step).

Through the above steps S1 and S2, the liquid crystal panel 151G is positioned at a desired position with respect to the cross dichroic prism 154. Then, for example, the liquid crystal panel 151 is fixed to the cross dichroic prism 154 with an adhesive or the like.
For the other liquid crystal panels 151R and 151B, the above-described steps S1 and S2 are performed to position the liquid crystal panels 151R and 151B at desired positions with respect to the cross dichroic prism 154. Then, for example, by fixing the liquid crystal panels 151R and 151B to the cross dichroic prism 154 with an adhesive or the like, the optical device body 150A is manufactured.

According to this embodiment described above, the following effects are obtained.
In the present embodiment, the control device 40 constituting the manufacturing apparatus 1 includes a pattern forming unit 433, a gravity center position calculating unit 4362A, a deviation calculating unit 4362B, and a fine adjustment control unit 4362C.
As a result, the pattern forming unit 433 forms the 1-dot pattern PD on the liquid crystal panel 151 (pattern formation step S22A), and the projected image F of the 1-dot pattern PD is displayed on the screen Sc, so that the pixel pitch of the liquid crystal panel 151 Is small (for example, 8 μm pitch), the pixels in the projected image F do not overlap each other.
In addition, since the center-of-gravity position calculation unit 4362A calculates the center-of-gravity position GP of the corresponding region Px ′ corresponding to the display pixel Px in the captured image captured by the imaging device 30 (the center-of-gravity position calculation step S22C), A plane position, that is, a plane position of the liquid crystal panel 151 (a position in a plane orthogonal to the Z-axis direction) can be specified.
Then, the deviation calculation unit 4362B calculates the deviation between the center of gravity position GP and the preset reference position SP (deviation calculation step S22D), and the fine adjustment control unit 4362C liquid crystals at a predetermined position with respect to the cross dichroic prism 154 based on the deviation. Since the panel 151 is positioned (adjustment control step S22G), the amount of deviation of the liquid crystal panel 151 from the desired alignment position (the amount of deviation from the reference position in the plane) can be calculated, and the liquid crystal panel 151 is placed at the desired alignment position. Can be positioned.
Therefore, even when the pixel pitch of the liquid crystal panel 151 is small, the alignment of the liquid crystal panel 151 can be adjusted with high accuracy, and the optical device main body 150A with high accuracy can be manufactured.

  Here, the center-of-gravity position calculation unit 4362A compares each luminance value for each pixel in the captured image data with the luminance threshold value BS, thereby configuring an area (corresponding to each pixel having a luminance value equal to or higher than the luminance threshold value BS). It is possible to discriminate between the region Px ′) and a region (other regions including a region widened by the influence of flare) composed of pixels having luminance values less than the luminance threshold BS. Therefore, the center-of-gravity position calculation unit 4362A can recognize the corresponding area Px ′ corresponding to the display pixel Px in a virtual state that is not affected by the flare of the projection lens 160, and calculates the center-of-gravity position GP of the corresponding area Px ′. Thus, the plane position of the display pixel Px, that is, the plane position of the liquid crystal panel 151 can be specified with high accuracy.

By the way, for example, each luminance value for each pixel in the corresponding area Px ′ is binarized into “0” and “1” by a predetermined threshold, and the center of gravity position of the corresponding area Px ′ is based on each binarized luminance value. Is calculated simply by calculating the position of the center of gravity according to the shape of the corresponding region Px ′, and the position shifted from the desired position due to the flare is set as the position of the center of gravity (the planar position of the display pixel Px). It will be calculated.
On the other hand, in the present embodiment, the center-of-gravity position calculation unit 4362A calculates the center-of-gravity position GP of the corresponding region Px ′ using the above equation (1). Thus, the gravity center position GP can be calculated in a state where the influence of flare is reduced, and the plane position of the display pixel Px, that is, the plane position of the liquid crystal panel 151 can be specified with higher accuracy.

  Further, four adjustment regions Ar2 are provided. That is, the gravity center position calculation unit 4362A calculates the gravity center positions GPA to GPD of the corresponding regions Px ′ corresponding to the display pixels Px in the four adjustment regions Ar2. As a result, four positions in the plane of the liquid crystal panel 151 are specified, and the alignment can be adjusted so that the specified four points match each reference position. Therefore, the liquid crystal panel 151 can be adjusted not only in the X-axis direction and the Y-axis direction but also in the Zθ direction within the plane, and the alignment of the liquid crystal panel 151 can be adjusted with high accuracy.

  Further, the pattern forming unit 433 is configured to be able to form the window pattern PW on the liquid crystal panel 151. In addition, the control device 40 includes a memory 432, a pattern determination unit 4361A, a brightness calculation unit 4361B, and a coarse adjustment control unit 4361C. Thus, before executing the fine alignment adjustment (step S22), the coarse alignment adjustment (step S21) can be executed, and the angular positions C1 to C1 of the window pattern PW (rectangular area Ar1 ′) in the imaging area PAr. Even when C4 is not located, the liquid crystal panel 151 can be quickly moved to the positions where the angular positions C1 to C4 are located in the imaging region PAr, and the alignment adjustment (step S2) of the liquid crystal panel 151 is smoothly performed. Thus, the manufacturing time of the optical device main body 150A can be shortened.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In the embodiment, four adjustment regions Ar2 are provided. However, any number of adjustment regions Ar2 may be used as long as at least three plane positions of the liquid crystal panel 151 can be specified. .

In the embodiment, the center of gravity position GP is calculated using the above formula (1), but the method of calculating the center of gravity position is not limited to this. For example, each luminance value for each pixel in the corresponding area Px ′ is binarized into “0” and “1” by a predetermined threshold, and the center of gravity position of the corresponding area Px ′ is calculated based on each binarized luminance value. It does not matter as a structure to do.
In the embodiment, the corresponding area Px ′ is recognized based on the luminance threshold BS, and the barycentric position GP of the corresponding area Px ′ is calculated. However, the present invention is not limited to this. For example, the center-of-gravity position may be calculated using the above formula (1) based on each luminance value for every pixel in the imaging region PAr.

In the embodiment, the flow shown in FIGS. 8, 10, and 13 is not limited to this, and the order may be changed as appropriate.
In the embodiment, three six-axis position adjusting devices 10 as position adjusting devices are provided. However, the present invention is not limited to this, and only one six-axis position adjusting device 10 is provided, and the cross dichroic prism 154 is appropriately configured. It may be configured to be rotatable to each position facing each light beam incident side end face 154A.

In the embodiment, the light source device 110 is configured as a discharge light-emitting type light source device. May be adopted.
In the above-described embodiment, only one light source device 110 is used and the color separation optical device 130 separates the three color lights. However, the color separation optical device 130 is omitted, and three color lights are respectively emitted. You may comprise the said solid light emitting element as a light source device.

In the embodiment, the optical device main body 150A includes the three liquid crystal panels 151. However, the configuration is not limited thereto, and the optical device main body 150A may include two liquid crystal panels or four or more liquid crystal panels. In addition, the optical device main body 150A has a G-color liquid crystal panel arranged on the light beam incident side end surface 154A facing the projection lens 160 among the three light beam incident side end surfaces 154A of the cross dichroic prism 154, and the other two light beams. Although the liquid crystal panel for R color light and the liquid crystal panel for B color light are arranged on the incident side end face 154A, the arrangement position is not limited to this, and for example, the light incident side end face 154A facing the projection lens 160 is for R color light. A configuration in which a liquid crystal panel or a liquid crystal panel for B color light is arranged may be employed.
In the above embodiment, only an example of a front type projector that projects from the direction of observing the screen has been described, but the present invention is also applicable to a rear type projector that projects from the side opposite to the direction of observing the screen. Is possible.

  The present invention can be used as a manufacturing apparatus for manufacturing an optical device of a projector because the position of the light modulation device can be adjusted with high accuracy.

The figure which shows typically the structure of a projector provided with the optical apparatus made into the manufacture object in this embodiment. The figure which shows typically schematic structure of the manufacturing apparatus of the optical apparatus main body in the said embodiment. The figure which shows typically the arrangement | positioning position of each CCD camera in the said embodiment. The block diagram which shows schematic structure of the control apparatus in the said embodiment. The figure which shows typically the various patterns formed in the liquid crystal panel in the said embodiment. The figure which shows the reference | standard pattern in the said embodiment typically. 6 is a flowchart for explaining a liquid crystal panel position adjustment method in the embodiment. 6 is a flowchart for explaining focus adjustment in the embodiment. The figure which shows the captured image (imaging area | region) imaged with each CCD camera in the said embodiment. The flowchart explaining the rough alignment adjustment in the said embodiment. The figure for demonstrating the rough alignment adjustment in the said embodiment. The figure which shows the positional relationship of the projection image of a window pattern with respect to the arrangement position of each CCD camera in the said embodiment. 5 is a flowchart for explaining fine alignment adjustment in the embodiment. The figure which shows the captured image (imaging area | region) imaged with each CCD camera in the said embodiment. The figure for demonstrating the calculation method of the gravity center position by the gravity center position calculation part in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus, 10 ... Position adjustment apparatus, 30 ... Imaging apparatus, 40 ... Control apparatus, 150 ... Optical apparatus, 151 ... Liquid crystal panel (light modulation apparatus), 154. .. Cross dichroic prism (color synthesis optical device), 432... Memory (reference pattern storage unit), 433... Pattern formation unit, 4361A... Pattern determination unit, 4361B. ... coarse adjustment control unit, 4362A ... center of gravity position calculation unit, 4362B ... deviation calculation unit, 4362C ... fine adjustment control unit (adjustment control unit), Ar1 ... rectangular area, Ar2 ... Adjustment area, Arf: Image formation area, BS: Luminance threshold, E1 to E4: Edge, GP: Center of gravity position, Px: Display pixel, Px ′: Corresponding area, PD ... 1 dot putter , PS1H, PS1V ... first reference pattern, PS2 ... second reference pattern, PW ... window pattern, SP ... reference position, S22A ... pattern formation step, S22C ... center of gravity Position calculation step, S22D... Deviation calculation step, S22G... Adjustment control step.

Claims (8)

A plurality of light modulation devices that modulate image light for each color light according to image information to form image light, and a color combining optical device that combines the image lights formed by the plurality of light modulation devices An optical device manufacturing apparatus for manufacturing an optical device comprising:
An imaging device that captures a projection image of image light formed by the light modulation device and enlarged and projected on a screen by the projection optical device via the color synthesis optical device;
A position adjustment device that holds any one of the plurality of light modulation devices and adjusts the position of the light modulation device with respect to the color synthesis optical device;
A control device for controlling the light modulation device and the position adjustment device,
The controller is
A pattern forming unit that causes the light modulation device to form a one-dot pattern in which only one display pixel is set to a predetermined brightness in an adjustment region used for position adjustment in the image formation region of the light modulation device;
A center-of-gravity position calculation unit that calculates a center-of-gravity position of a corresponding region corresponding to the display pixel in the captured image based on each luminance value for each pixel in the captured image captured by the imaging device;
A deviation calculating unit for calculating a deviation between the center of gravity position and a preset reference position;
An apparatus for manufacturing an optical device, comprising: an adjustment control unit that drives and controls the position adjustment device based on the deviation and positions the light modulation device at a predetermined position with respect to the color synthesis optical device. In the manufacturing apparatus of the optical device according to claim 1,
The center-of-gravity position calculation unit
An optical apparatus characterized by comparing each luminance value for each pixel in the captured image with a preset threshold value and recognizing an area composed of each pixel having a luminance value equal to or higher than the threshold value as the corresponding area. Manufacturing equipment. In the manufacturing apparatus of the optical device according to claim 1 or 2,
The apparatus for manufacturing an optical device is characterized in that at least three adjustment regions are provided. In the manufacturing apparatus of the optical apparatus in any one of Claims 1-3,
The pattern forming unit forms, in the light modulation device, a window pattern in which each pixel positioned at an outer edge is set to a predetermined brightness in a rectangular region including the adjustment region in the image forming region of the light modulation device. Let
The display pixel is a pixel positioned at a corner of the rectangular region,
The controller is
A reference pattern storage unit storing a first reference pattern corresponding to the vicinity of the edge of the window pattern and a second reference pattern corresponding to the vicinity of a corner of the window pattern;
A pattern determination unit that determines whether or not a reference pattern stored in the reference pattern storage unit exists in a captured image captured by the imaging device;
When the pattern determination unit determines that the first reference pattern is present in the captured image, the pattern determination unit determines a moving direction of the light modulation device, and the pattern determination unit includes the first reference pattern in the captured image. And a coarse adjustment control unit that drives and controls the position adjustment device until the light modulation device is moved in the movement direction until it is determined that two reference patterns exist. apparatus. In the manufacturing apparatus of the optical device according to claim 4,
The window pattern is a pattern in which each pixel positioned at an outer edge in the rectangular area and each pixel positioned in the rectangular area are set to a predetermined brightness,
The controller is
A brightness calculation unit that calculates the brightness of the captured image based on each luminance value for each pixel in the captured image captured by the imaging device;
The coarse adjustment control unit
Based on the brightness calculated by the brightness calculation unit when the pattern determination unit determines that both the first reference pattern and the second reference pattern do not exist in the captured image. Determining the moving direction of the light modulation device, and driving and controlling the position adjustment device until the pattern determination unit determines that the second reference pattern exists in the captured image. An apparatus for manufacturing an optical apparatus, wherein the apparatus is moved in the moving direction. A plurality of light modulation devices that modulate image light for each color light according to image information to form image light, and a color combining optical device that combines the image lights formed by the plurality of light modulation devices A position adjustment method used in an optical device manufacturing apparatus for manufacturing an optical device comprising:
A pattern forming step of causing the light modulation device to form a one-dot pattern in which only one display pixel is set to a predetermined brightness in an adjustment region used for position adjustment in the image formation region of the light modulation device;
A center-of-gravity position calculation step of calculating a center-of-gravity position of a corresponding region corresponding to the display pixel in the captured image based on each luminance value for each pixel in the captured image captured by the imaging device;
A deviation calculating step for calculating a deviation between the center of gravity position and a preset reference position;
A position adjustment method comprising: an adjustment control step of driving and controlling a position adjustment device based on the deviation and positioning the light modulation device at a predetermined position with respect to the color synthesis optical device. A plurality of light modulation devices that modulate image light for each color light according to image information to form image light, and a color combining optical device that combines the image lights formed by the plurality of light modulation devices A position adjustment program for use in an optical device manufacturing apparatus for manufacturing an optical device,
A position adjustment program for causing a computer to execute the position adjustment method according to claim 6.   A recording medium on which the position adjustment program according to claim 7 is recorded so as to be readable by a computer.

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