JP2010102099A - Device for manufacturing optical device, position adjusting method, and position adjusting program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for manufacturing an optical device, which can calculate a focus position with high accuracy, while achieving shortening of adjusting time. <P>SOLUTION: A controller unit 40 constituting the device for manufacturing the optical device includes: a displacement position controller 4351 positioning an optical modulation device at a plurality of displacement positions in a direction where the optical modulation device approaches to and separates from a color synthesizing optical device; an index value calculation part 4352 calculating respective measurement index values showing contrast of respective picked up images picked up by an imaging apparatus when the optical modulation device is positioned at each displacement position; a pseudo index value generation part 4353 generating a pseudo index value at a virtual displacement position between the respective displacement positions based on the respective measurement index values; and a focus position calculation part 4354 calculating the focus position of the optical modulation device where the picked up image is in a focused state by obtaining weighted average of a displacement position where the index value becomes equal to or more than a threshold and the virtual displacement position with each difference obtained by subtracting the predetermined threshold from respective index values such as measuring index value and the pseudo index value as weight. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

Conventionally, three light modulation devices that modulate three color lights of R, G, and B in accordance with image information for each color light, and color combining optics that is mounted with these light modulation devices and combines three modulated light beams There is known a projector including an optical device including the device and a projection lens that magnifies and projects a light beam emitted from the color synthesis optical device.
In such a projector, in order to obtain a clear projection image, each light modulator must be in the back focus position of the projection lens.
For this reason, at the time of manufacturing the projector, focus adjustment for accurately arranging each light modulation device at the back focus position of the projection lens is 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).

  In the technique described in Patent Document 1, when the light modulation device is positioned at each displacement position while displacing the light modulation device in the direction of approaching and separating from the color synthesis optical device, the light modulation device and the color synthesis optics are arranged. The image light that has passed through the apparatus is imaged by the imaging apparatus. In addition, each index value indicating the contrast of each captured image is calculated, a secondary approximate curve representing the relationship between each displacement position and each index value is generated, and the peak position of the secondary approximate curve is calculated as the focus position. is doing.

JP 2005-107360 A

However, with the technique described in Patent Document 1, it is possible to reduce the time required for focus adjustment of the liquid crystal panel (hereinafter referred to as adjustment time), but it is possible to calculate the focus position with high accuracy as described below. There is a problem that is difficult.
That is, when calculating the peak position of the quadratic approximate curve as the focus position, index values must be calculated at many displacement positions. That is, the focus position cannot be calculated with high accuracy unless the number of data for generating the quadratic approximate curve is increased. As in the technique described in Patent Document 1, in order to shorten the adjustment time, when the index value is calculated with a small displacement position such as three, the number of data is small, so the peak position of the second order approximate curve Will deviate from the desired focus position.
Further, the index value becomes smaller as it deviates from a desired focus position, and shows a behavior that converges to a predetermined low value. That is, each index value at a displacement position greatly deviated from the desired focus position deviates greatly from the quadratic curve. Therefore, when calculating index values at many displacement positions in order to calculate the focus position with high accuracy, these index values include index values that deviate significantly from the quadratic curve as described above. In this case, the generated secondary approximate curve has low accuracy, and as a result, the peak position of the secondary approximate curve also deviates from the desired focus position.

  An object of the present invention is to provide an optical device manufacturing apparatus, a position adjustment method, and a position adjustment program capable of calculating a focus position with high accuracy while reducing an adjustment time.

  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 apparatus manufacturing apparatus for manufacturing an optical apparatus including a color combining optical apparatus for combining light, the position adjusting apparatus for adjusting the position of the light modulating apparatus with respect to the color combining optical apparatus, and the light modulating apparatus And an image pickup device that picks up image light via the light modulation device and the color synthesizing optical device, and a control device that controls the position adjustment device. The control device controls the position adjustment device. , When the light modulation device is positioned at a plurality of displacement positions by displacing the light modulation device in the direction of separating and separating the light modulation device from the color synthesis optical device, and when the light modulation device is positioned at each of the displacement positions, The imaging device An index value calculation unit that calculates each measurement index value indicating the contrast of each captured image captured and a pseudo index value at a virtual displacement position between each displacement position is generated based on each measurement index value The pseudo index value generation unit, the displacement position at which each index value is equal to or greater than the threshold value, and the virtual position, each weight being a difference obtained by subtracting a predetermined threshold value from each index value of each measurement index value and pseudo index value And a focus position calculation unit that calculates a weighted average of displacement positions and calculates a focus position of the light modulation device in which the captured image is in focus.

In the present invention, the control device constituting the manufacturing apparatus includes a pseudo index value generation unit and a focus position calculation unit in addition to the displacement position control unit and the index value calculation unit.
Thus, by the process (pseudo index value generation step) by the pseudo index value generation unit, virtual measurement is performed without actually measuring (positioning the liquid crystal panel at the displacement position and calculating the measurement index value based on the captured image). It is possible to generate a pseudo index value (pseudo index value) at a correct displacement position (virtual displacement position). That is, it is possible to add pseudo data (pseudo index value) to actually measured data (measurement index value) and increase the number of data used when calculating the focus position.
In the processing by the focus position calculation unit (focus position calculation step), the focus position can be calculated by weighted average using a large amount of data (measurement index value and pseudo index value) even though the actually measured data is small. Therefore, the focus position can be calculated with high accuracy while reducing the adjustment time.
In particular, in the focus position calculation step, the focus position is calculated by a weighted average without using data whose index value is less than the threshold, and using each difference obtained by subtracting the threshold from the measured index value and the pseudo index value as a weight. For this reason, the weighted average value (focus position) can be brought closer to the desired focus position compared to a configuration in which the focus position is calculated by weighted average using the measurement index value and the pseudo index value as weights. It can be calculated with higher accuracy.

In the optical device manufacturing apparatus of the present invention, the pseudo index value generation unit calculates a first-order approximation function representing a relationship between the displacement position and the measurement index value between adjacent displacement positions, and the 1 The pseudo index value is preferably generated based on the following approximate function.
In the present invention, the pseudo index value generation unit generates the pseudo index value by calculating the above-described first-order approximation function, so that the pseudo index value can be generated by a simple calculation.
In addition, each measurement index value at each displacement position adjacent to the position in the light modulator in the direction of approaching and separating from the color synthesis optical apparatus is linearly approximated, and the index value on the straight line is used as a pseudo index value. A large difference is unlikely to occur between the measurement index value when actually measured at the virtual displacement position and the pseudo index value generated as described above. Therefore, even when the focus position is calculated by adding the pseudo index value generated as described above to the data, a highly accurate focus position can be calculated.

In the optical device manufacturing apparatus of the present invention, the pseudo index value generation unit generates the first-order approximation function that is continuous between adjacent displacement positions, and the focus position calculation unit includes the color synthesis optical device. The range of the position Z in which the position of the light modulation device in the direction of approaching and separating is Z, the primary approximation function is f (Z), the threshold is ft, and each index value is equal to or greater than the threshold ft the when the _Z s to Z _e, the focus position Zfocus, it is preferable to calculate the following formula (1).

In the present invention, as shown in Expression (1), the focus position calculation unit uses the difference obtained by subtracting the threshold value ft from the first-order approximation function f (Z) as a weight, and sets the index value at the position Z where the index value is equal to or greater than the threshold value ft. Since the weighted average is obtained by integrating the ranges Z _{s to} Z _e , the number of data (pseudo index values) used for calculating the focus position can be made infinite, and the focus position can be calculated with higher accuracy.

By the way, for example, in a configuration in which weighted average is performed without integration, when the number of data (measurement index value and pseudo index value) used for calculation of the focus position is small, only data greater than the threshold value ft is increased by one. The calculated focus position tends to shift. That is, when the focus adjustment is performed a plurality of times under the same conditions, the calculated focus positions tend to be different from each other.
In the present invention, since the weighted average is obtained by integrating as described above, the above-described phenomenon is unlikely to occur, and the calculated focus position is determined even when focus adjustment is performed a plurality of times under the same conditions. The positions can be substantially the same. That is, the focus position can be calculated with high accuracy.

  In the optical device manufacturing apparatus of the present invention, the displacement position control unit displaces the light modulation device within a predetermined range, and the control device serves as a start end displacement position that is a start end within the predetermined range, and a terminal end. When it is determined by the index value determination unit that determines whether or not each measurement index value at the terminal displacement position is less than the threshold, and the index value determination unit does not exceed the threshold, It is preferable to include a range extending portion that extends the end displacement position to expand the predetermined range.

By the way, for example, when the measurement index value at the start end displacement position is less than the threshold value, but the measurement index value at the end position displacement is not less than the threshold value, the measurement at the displacement position after the end displacement position is performed. It is in a state where it is impossible to determine how the index value behaves (whether it is higher or lower than the measured index value at the terminal displacement position). That is, in such a state, even if the focus position is calculated based on each measurement index value and the pseudo index value, it is difficult to calculate the focus position with high accuracy.
In the present invention, the control device includes an index value determination unit and a range expansion unit, and extends the end displacement position when each measurement index value of both the start end displacement position and the end displacement position is not less than the threshold value. To expand the range. That is, in the above case, the measurement is continued. Thus, the focus position can be calculated in a state where the behavior of the measurement index value can be determined, and thus the focus position can be calculated with high accuracy.
In addition, since the measurement is continued in the above case, it is not necessary to repeat the measurement from the beginning, and the adjustment time can be further shortened.
In addition, when the measurement index values at both the start and end displacement positions are less than the threshold value, the behavior of the measurement index values can be judged, so adjustments can be made without taking more data than necessary. Time can be further reduced.

In the optical device manufacturing apparatus of the present invention, the control device is configured to measure each measurement index value at each displacement position when the light modulation device is displaced within the predetermined range by the displacement position control unit. It is preferable to include a threshold value calculation unit that sequentially calculates the threshold value by multiplying the maximum measurement index value by a constant.
In the present invention, the control device includes a threshold value calculation unit, and when the light modulation device is displaced, the control index value that is the maximum is multiplied by a constant (a constant smaller than 1), and the predetermined threshold value is sequentially calculated. (Update. The measurement index value varies depending on the brightness of the light source and the performance of the projection lens, in addition to whether the focus is achieved. The brightness of the light source deteriorates over time, and the projection lens varies in quality, so the measurement index value fluctuates every time (the condition that the measurement index value increases at the focused position does not change, The overall measurement index value increases or decreases). For this reason, it is possible to calculate the focus position with higher accuracy by using a threshold value that fluctuates in accordance with the fluctuation of the measurement index value, that is, a constant multiple of the maximum measurement index value, rather than a fixed threshold value.
If data is insufficient, data is added. At this time, the threshold value may fluctuate in the process of adding data. However, since the threshold value is calculated by a constant multiple of the maximum value of the measurement index value, the threshold value may increase but the threshold value will not decrease. In addition, whether or not the data is insufficient is determined by whether or not the measurement index value is less than or equal to the threshold value at the terminal displacement position. The portion that is determined to have sufficient data is not determined to be insufficient after the data is added. For this reason, it is possible to reliably add data.

  The position adjustment method of the present invention includes a position adjustment device that adjusts the position of a light modulation device relative to a color synthesis optical device, and image light that is introduced into the light modulation device and passes through the light modulation device and the color synthesis optical device. A position adjustment method used in an optical device manufacturing apparatus for manufacturing an optical device having a plurality of the light modulation devices and the color combining optical device. A displacement position control step for controlling the position adjustment device, displacing the light modulation device in the direction of approaching and separating the color synthesis optical device, and positioning the light modulation device at a plurality of displacement positions; An index value calculating step for calculating each measurement index value indicating a contrast of each captured image captured by the imaging device when the light modulation device is positioned at a displacement position; Based on the measurement index value, a pseudo index value generation step for generating a pseudo index value at a virtual displacement position between the displacement positions, and a predetermined threshold value from each of the measurement index value and each index value of the pseudo index value Using each subtracted difference as a weight, a weighted average of the displacement position and the virtual displacement position at which each index value is equal to or greater than the threshold is calculated, and the focus position of the light modulation device at which the captured image is in focus is calculated. And executing a focus position calculating step.

  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 position adjustment device that adjusts the position of the light modulation device with respect to the color synthesis optical device, and image light that is introduced into the light modulation device and passes through the light modulation device and the color synthesis optical device. A position adjustment program for use in an optical device manufacturing apparatus that manufactures an optical device that includes a plurality of the light modulation devices and the color combining optical device, and an image pickup device that controls the position adjustment device. The position adjustment method described above is executed by the control device.
Since the position adjustment program of the present invention is used to implement the position adjustment method described above, the same operation and effect as the position adjustment method described above can be enjoyed.

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 and the like for controlling each component inside 100 are arranged.

  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, and 3 as a light modulation device Three liquid crystal panels 151 (the red light side liquid crystal panel is 151R, the green light side liquid crystal panel is 151G, and the blue light side liquid crystal panel is 151B), three incident side polarizing plates 152, three outgoing side polarizing plates 153 , And a cross dichroic prism 154 (hereinafter referred to as a color synthesis optical device) Includes an optical device 150 having the prism 154 and described), etc., and a projection lens 160 as a projection optical device.

In addition, about each optical component 110-160 mentioned above, since it is utilized as an optical system of various general projectors, concrete description is abbreviate | omitted.
In the optical unit 100B, with the configuration described above, the light beam emitted from the light source device 110 and passing through the illumination optical device 120 is separated into three color lights of R, G, and B by the color separation optical device 130. Each separated color light is modulated in accordance with image information in each liquid crystal panel 151 under the control of the control device, and image light for each color light is formed. The image light for each color light is synthesized by the prism 154 and enlarged and projected on a screen (not shown) by the projection lens 160.

Here, although not specifically illustrated, among the members 151 to 154 constituting the optical device 150 described above, the three liquid crystal panels 151 and the three exit-side polarizing plates 153 are incident on the light beams of the prism 154. The optical device main body 150A is configured to be fixed in a state of being opposed to the side end surfaces 154A (FIG. 1).
Note that the three liquid crystal panels 151 and the three exit-side polarizing plates 153 are not limited to being directly fixed to the light-incident-side end surface 154A, but may be a predetermined member (translucent substrate or each member 151, 153). It may be configured to be fixed to the light incident side end face 154A via a holding member or the like for holding the light. Further, as the optical device main body 150A, a configuration in which the three incident side polarizing plates 152 in addition to the three liquid crystal panels 151, the three exit side polarizing plates 153, and the prism 154 may be integrated.

[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.
The manufacturing apparatus 1 adjusts the position of each liquid crystal panel 151 with respect to the prism 154, and then fixes the liquid crystal panel 151 to the light beam incident side end surface 154A to manufacture the optical device body 150A. As shown in FIG. 2, the manufacturing apparatus 1 is roughly composed of a screen Sc, three position adjusting devices 10, an adjustment light source device 20, an imaging device 30, a control device 40, and the like.
The screen Sc is configured as a so-called transmissive screen that transmits and projects incident image light. The screen Sc is formed by the liquid crystal panel 151 in a state where the optical device main body 150A and the projection lens 160 to be manufactured are installed at predetermined positions inside the manufacturing device 1, and is attached to the projection lens 160 via the prism 154. The projected image light 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 position adjusting devices 10 are arranged to face each light beam incident side end surface 154 </ b> A (the emission side polarizing plate 153 is attached) of the prism 154 installed at a predetermined position inside the manufacturing apparatus 1. While holding the liquid crystal panel 151 from the light beam incident side, the position of each liquid crystal panel 151 with respect to each light beam incident side end surface 154A is adjusted. Although not specifically shown, the 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 in the biaxial direction (X-axis direction (FIG. 2) perpendicular to the Z-axis. Medium, direction parallel to the paper surface), Y-axis direction (direction perpendicular to the paper surface in FIG. 2), rotation direction around the Z axis (hereinafter referred to as Zθ direction), rotation direction around the X axis (hereinafter referred to as Xθ direction) and a rotation direction around the Y axis (hereinafter referred to as Yθ direction), and the position adjustment device 10 is controlled by a control unit 40 that controls a driving unit 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 side end surface 154A.

  The adjustment light source device 20 is a light source of a position adjusting light beam used when adjusting the position of the liquid crystal panel 151 in the position adjustment device 10, and is, for example, a discharge light emitting lamp such as a metal halide lamp, an LED (Light Emitting Diode), or 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 R, G, and B color lights to the three position adjustment devices 10, respectively, and corresponds to the liquid crystal panels 151R, 151G, and 151B from the tip portion of each position adjustment device 10. Each color light to be irradiated is irradiated to each liquid crystal panel 151.

Under the control of the control device 40, the imaging device 30 captures the projection image F (FIG. 2) of the image light enlarged and projected on the screen Sc by the projection lens 160 via the optical device main body 150A. As shown in FIG. 2, the imaging device 30 includes four CCD cameras 31 and images four corner areas in the projection image F.
FIG. 3 is a diagram schematically illustrating the arrangement position of the imaging device 30.
Each CCD camera 31 is an area sensor that uses a CCD (Charge Coupled Detector) as an imaging device, images four corner areas in a rectangular projection image F displayed on the screen Sc, and controls a signal corresponding to the captured image. Output to the device 40. More specifically, each CCD camera 31 is disposed on the back side of the screen Sc (the side opposite to the side on which image light is projected). In addition, as shown in FIG. 3, each CCD camera 31 has a second rectangular area Ar2 including an alignment adjustment pattern (described later) formed on the liquid crystal panel 151 when the alignment adjustment of the liquid crystal panel 151 is performed (see FIG. 5). ) Corresponding to the corner positions C1 to C4 of the four corners of the second rectangle corresponding area Ar2 ′ displayed on the screen Sc.
Hereinafter, 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 camera 31A, and the CCD camera 31 disposed at the upper right is referred to as a second camera 31B, and disposed at the lower left. The CCD camera 31 to be used is a third camera 31C, and the CCD camera 31 disposed in the lower right is a fourth 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 controls the entire manufacturing apparatus 1 and the liquid crystal panel 151 in response to an operation signal input from the operation unit 41. As shown in FIG. 4, the control unit 43 includes a control unit main body 431 and a memory 432.
The control unit main body 431 is configured as a program developed on an OS (Operating System) that controls the CPU, and executes predetermined processing according to the program stored in the memory 432. As shown in FIG. 4, the control unit main body 431 includes a pattern forming unit 433, a captured image data acquisition unit 434, a focus adjustment unit 435, 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 forms a second rectangle centered on the center position O in the image forming area Arf in the liquid crystal panel 151 as a pattern for performing alignment adjustment of the liquid crystal panel 151. An alignment adjustment pattern PA (FIG. 5B) is formed in the region Ar2.
In the alignment adjustment pattern PA, as shown in FIG. 5B, all the pixels in the second rectangular area Ar2 have a predetermined brightness (white display (tone value indicating white)), and the image forming area Arf. This is an image in which all other pixels except for the second rectangular area Ar2 are displayed in black (tone value indicating black).

Further, for example, as shown in FIG. 5, the pattern forming unit 433 uses the first rectangular area Ar1 centered on the center position O in the image forming area Arf as a pattern for adjusting the focus of the liquid crystal panel 151. Then, a focus adjustment pattern PF (FIG. 5C) is formed. The first rectangular area Ar1 is set as described below.
That is, the first rectangular area Ar1 is set to be larger than the second rectangular area Ar2 described above (FIG. 5A), and is displayed on the screen Sc corresponding to the first rectangular area Ar1. The first rectangular corresponding area Ar1 ′ (FIG. 3) is set so as to cover the arrangement positions of the four CCD cameras 31 in a plane.
In the focus adjustment pattern PF, as shown in FIG. 5C, all the pixels in the first rectangular area Ar1 are displayed in white and black every other pixel along the vertical and horizontal directions. This is an image in which all the pixels other than the first rectangular area Ar1 in the image forming area Arf are displayed in 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 the electrical signal output from each CCD camera 31 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 controls the position adjustment device 10 via a drive unit such as a motor, and performs focus adjustment to position the liquid crystal panel 151 at the calculated focus position.
Note that the focus position means that the captured images in the four corner areas of the projected image F captured by the CCD cameras 31 when the projected image F of the focus adjustment pattern PF is displayed on the screen Sc are in a focused state. It means the position of the liquid crystal panel 151.

As shown in FIG. 4, the focus adjustment unit 435 includes a displacement position control unit 4351, an index value calculation unit 4352, a pseudo index value generation unit 4353, a focus position calculation unit 4354, an index value determination unit 4355, A range expansion unit 4356 and a threshold calculation unit 4357 are provided.
The displacement position control unit 4351 controls the position adjustment device 10 and moves the position adjustment device 10 in the Z-axis direction, thereby positioning the position Z in the Z-axis direction on the liquid crystal panel 151 at a plurality of preset displacement positions. .
The plurality of displacement position has been set at equal intervals in the predetermined displacement amount in the Z-axis direction, in this embodiment, a primary reference displacement position Z ₁ from the ninth displaced position Z ₉ Nine displacement positions up to (see FIG. 8) are set.
Then, the displacement position control section 4351, the reference displacement position _{Z 1} to 9 displaced position _{Z 9,} displaces the liquid crystal panel 151 in the Z-axis direction within a predetermined range W.
The displacement position control section 4351, if the range W is expanded in a range extension 4356 is beyond the ninth displacement position _{Z 9,} 10 displaced position _{Z 10,} 11 displaced position _{Z 11,} · ..., and the n displacement position Z _n, is displaced by the displacement amount minutes to position the liquid crystal panel 151 to the respective displacement position.

When the liquid crystal panel 151 is positioned at each displacement position, the index value calculation unit 4352 converts the luminance value for each pixel in the four captured image data captured by the imaging device 30 and output from the captured image data acquisition unit 434. Based on this, each index value f regarding the contrast of the four captured images is calculated.
Here, the contrast-related index value f may be an index value indicating the sharpness of the captured image. For example, a value calculated based on the maximum luminance value and the minimum luminance value of all pixels in the captured image data. (Contrast value) may be adopted as an index value, or variation in luminance values of a plurality of pixels in a predetermined area in a captured image, that is, a variance value (σ ² ) of luminance values is adopted as an index value. Also good.
Hereinafter, the index value f calculated by the index value calculation unit 4352 will be described as the measured index value f.

The pseudo index value generation unit 4353 generates a pseudo index value at a virtual displacement position between the displacement positions based on each measurement index value f.
In the present embodiment, the pseudo index value generation unit 4353 calculates a continuous first-order approximation function f (Z) representing the relationship between the displacement position and the measurement index value f for each adjacent displacement position.
That is, the pseudo index value generation unit 4353 generates a pseudo index value at an arbitrary position Z (virtual displacement position) in addition to each displacement position by calculating a continuous first-order approximation function f (Z). ing.

The focus position calculation unit 4354 uses, as a weight, each difference obtained by subtracting a predetermined threshold value from each index value of each measurement index value f and pseudo index value, and a weighted average of the displacement position and the virtual displacement position at which each index value is equal to or greater than the threshold value. The focus positions of the four corner areas of the liquid crystal panel 151 where the respective captured images of the four corner areas of the projection image F captured by the imaging device 30 are in focus are calculated. The focus position calculation unit 4354 controls the position adjustment device 10 and moves the position adjustment device 10 in the Z-axis direction, the Xθ direction, and the Yθ direction, thereby positioning the four corner regions of the liquid crystal panel 151 at the respective focus positions. .
In this embodiment, as shown in the following formula (2), the focus position calculation unit 4354 uses a value obtained by subtracting a predetermined threshold value ft from the approximate function f (Z) as a weight, and the value of the approximate function f (Z). The focus position Zfocus is calculated by taking a weighted average by integrating over the range (position Z _s to position Z _e ) of the displacement position where the (measurement index value and pseudo index value) is equal to or greater than the predetermined threshold ft.

The index value determination unit 4355 performs each measurement at the start end displacement position (reference displacement position Z ₁ ) serving as the start end in the range W and the end displacement position serving as the end (the ninth displacement position Z _{9 in} the above setting). It is determined whether or not the index value f is less than the threshold value ft.
When the index value determination unit 4355 determines that the range expansion unit 4356 does not fall below the threshold value ft, the range expansion unit 4356 extends the end displacement position and expands the range W.
When the displacement position control unit 4351 is displacing the liquid crystal panel 151 within the range W, the threshold value calculation unit 4357 is set to a constant (the maximum measurement index value f among the measurement index values f at each displacement position). In this embodiment, the threshold value ft is calculated (updated) sequentially by multiplying by 0.8).

  The alignment adjustment unit 436 adjusts the alignment 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 alignment adjustment pattern PA is displayed on the screen Sc. carry out. 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 controls the 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 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.

[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 prism 154 will be mainly described, and description of the other components (such as a fixing method) is omitted.
FIG. 6 is a flowchart for explaining a method for adjusting the position of the liquid crystal panel 151.
First, the operator installs the 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. In addition, each liquid crystal panel 151 is held by each position adjustment 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. 7 is a flowchart for explaining focus adjustment.
The focus adjustment unit 435 reads design coordinate values (the coordinate value in the Z-axis direction is the reference displacement position Z ₁ ) of the liquid crystal panel 151G included in the model data stored in the memory 432, and passes through a drive unit such as a motor. Then, the position adjusting device 10 is controlled to install the liquid crystal panel 151G at the initial position (step S1A).

After step S1A, the control unit main body 431 controls the adjustment light source device 20 via the light source driving circuit to irradiate 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 on the liquid crystal panel 151G is enlarged and projected onto the screen Sc by the projection lens 160 via the prism 154, and the projection image F of the focus adjustment pattern PF is displayed on the screen Sc. The

After step S <b> 1 </ b> C, the captured image data acquisition unit 434 outputs a predetermined control signal to the imaging device 30, and outputs the projection image F (first rectangular correspondence area Ar <b> 1 ′) of the focus adjustment pattern PF to each CCD camera 31. Each of the four corner regions is imaged (step S1D).
After step S1D, the index value calculation unit 4352 calculates the measurement index value f related to the contrast of the four captured images based on the luminance value for each pixel in the four captured image data output from the captured image data acquisition unit 434. (Step S1E: index value calculation step). Then, the index value calculation unit 4352 stores the calculated four measurement index values f in the memory 432 according to the displacement position of the liquid crystal panel 151G and according to the imaged CCD camera 31.
The “captured CCD camera 31” means the CCD camera 31 that captured a captured image used when calculating the measurement index value f. That is, the measurement index value f is stored in the memory 32 in association with the corner positions C1 to C4 at the four corners where the imaged CCD camera 31 is disposed. The same applies hereinafter.

After step S1E, the threshold value calculation unit 4357 checks the information stored in the memory 432, and sets the maximum measured index value f among the measured index values f at each displacement position for each captured CCD camera 31. The threshold value ft is calculated by multiplying by “0.8” (step S1F). Then, the threshold value calculation unit 4357 stores the calculated threshold value ft in the memory 432 according to the CCD camera 31 that captured the image.
After step S1F, the displacement position control unit 4351 confirms the information stored in the memory 432, and whether the measurement index value f is calculated at all the displacement positions (start end displacement position Z ₁ to end displacement position Z ₉ ). It is determined whether or not (step S1G).
In step S1G, when the displacement position control unit 4351 determines “N”, that is, when it is determined that the measurement index value f has not been calculated at all the displacement positions, the displacement position control unit 4351 passes a driving unit such as a motor. Then, the position adjusting device 10 is 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 S1H: displacement position control step). And step S1D-S1H mentioned above is repeatedly implemented, and the measurement parameter | index value f and the threshold value ft are calculated sequentially.

FIG. 8 is a diagram for explaining processing by the index value determination unit 4355 and the range expansion unit 4356.
Here, in FIG. 8, the horizontal axis indicates the position Z in the Z-axis direction of the liquid crystal panel 151G, and the vertical axis indicates the index value.
Further, in FIG. 8, within W, measured index value at the reference displacement position Z ₁ f ₁ is the lowest, the measurement index value f sequentially in accordance with a change in displacement position, increases, the ninth displacement position (end displacement position) measured index value f ₉ at Z ₉ is illustrates the case highest.
Then, in the example of FIG. 8, the result of step S1D~S1H described above is repeated, the threshold ft calculated, as shown by broken lines, the most metrics value f at high ninth displaced position Z ₉ The measurement index value f ₉ is multiplied by “0.8”.

Then, the index value determination unit 4355 as a result of the processing described above S1D~S1H is repeated, the processing S1G, when it is determined that the "Y", namely, all the displacement position (reference displacement position _{Z 1} ~ 9 When it is determined that the measurement index value f has been calculated at the displacement position Z ₉ ), the information stored in the memory 432 is read, and the measurement index values f at the reference displacement position Z ₁ and the terminal displacement position are threshold values. It is determined whether it is less than ft (step S1I).

When it is determined “N” in step S1I, range extension unit 4356 extends the terminal displacement position (step S1J), and proceeds to the process of step S1H.
For example, as shown in FIG. 8, when the measurement index value f ₉ at the terminal displacement position (the ninth displacement position Z ₉ ) is not less than the threshold value ft (broken line in FIG. 8), the ninth displacement position Z What behavior each measurement index value f at the displacement position after ₉ (10th displacement position Z ₁₀ , 11th displacement position Z ₁₁ ,... Nth displacement position Z _n ) shows (measurement index value f or it becomes higher than _9, or in a state that can not determine) will become lower than the measured index value f _9. That is, in such a state, even if the focus position is calculated based on the measurement index values f _{1 to} f ₉ , it is difficult to calculate the focus position with high accuracy.
Therefore, in the present embodiment, when the measurement index values f at the reference displacement position Z1 and the terminal displacement position are not less than the threshold value ft, the terminal displacement position is extended (steps S1I and S1J). The calculation of the measurement index value f and the threshold value ft at the displacement positions after the ninth displacement position Z9 is continued until “Y” is determined.

In the example of FIG. 8, as a result of repeated steps S1D~S1J by extending the end displacement position to the 16 position of displacement Z _16, in step S1I, when it is determined that "Y", i.e., the reference displacement position The case where it is determined that the measurement index values f ₁ and f _{16 at} Z ₁ and the terminal displacement position (the 16th displacement position Z ₁₆ ) are less than the threshold value ft is illustrated.
Further, in FIG. 8, the threshold value ft is indicated by a solid line, a result of the repeated step S1D～S1J, because now the highest metrics value measured index value _{f 11} at the 11th position of displacement _{Z 11,} measured index value f ₁₁ is multiplied by “0.8”.

FIG. 9 is a diagram for explaining a calculation method of the focus position.
Here, in FIG. 9, the horizontal and vertical axes are the same as those in FIG.
In FIG. 9, for convenience of explanation, the terminal displacement position as a result of repeatedly performing Steps S1D to S1H or Steps S1D to S1J is defined as Z _n (measurement index value f _n ), and the third displacement position Z ₃ and The illustration between the (n−2) th displacement position Z _n−2 (measurement index value f _n−2 ) is omitted.
Then, if it is determined as “Y” in step S1I, the pseudo index value generation unit 4353, as shown in FIG. 9, between each displacement position and each measurement index value, between adjacent displacement positions. A continuous first-order approximation function f (Z) representing the relationship is generated (step S1K: pseudo index value generation step).
In step S1K, the pseudo index value generation unit 4353 generates the continuous approximate function f (Z) for each imaged CCD camera 31 (for each corner position C1 to C4).

After step S1K, the focus position calculation unit 4354 finally performs the approximation function f (Z) calculated in step S1K and steps S1D to S1H or steps S1D to S1J as a result of repetition. Is used to calculate the focus position Zfocus according to the equation (2) (step S1L: focus position calculation step).
In step S1L, the focus position calculation unit 4354 calculates the focus position Zfocus for each captured CCD camera 31 (for each of the four corner positions C1 to C4).

  After step S1L, the focus position calculation unit 4354 controls the position adjustment device 10 via a driving unit such as a motor, and moves the liquid crystal panel 151G in the Z direction, the Xθ direction, and the Yθ direction to capture the CCD camera 31. The four corner positions of the image forming area Arf in the liquid crystal panel 151G corresponding to (the four corner positions C1 to C4) are positioned at the respective focus positions (step S1M).

After step S1, the control unit main body 431 performs alignment adjustment of the liquid crystal panel 151G (step S2).
The process in step S2 is the same as the conventional method, and will be described in a simplified manner below.
That is, the pattern forming unit 433 outputs a predetermined drive signal to the liquid crystal panel 151G, and causes the liquid crystal panel 151G to form the alignment adjustment pattern PA.
The alignment adjustment unit 436 checks the captured images (the four corner areas of the alignment adjustment pattern PA (second rectangular corresponding area Ar2 ′)) captured by each CCD camera 31 in advance in the memory 432. A pattern matching process is performed with the stored reference pattern, and the alignment position of the liquid crystal panel 151G where the captured image matches the reference pattern is calculated. Then, the alignment adjustment unit 436 controls the position adjustment device 10 via a drive unit such as a motor, and moves the liquid crystal panel 151G in the X direction, the Y direction, and the Zθ direction and positions the liquid crystal panel 151G at the alignment position.

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

According to this embodiment described above, the following effects are obtained.
In the present embodiment, the control device 40 configuring the manufacturing apparatus 1 includes a pseudo index value generation unit 4353 and a focus position calculation unit 4354 in addition to the displacement position control unit 4351 and the index value calculation unit 4352.
Thus, the process (pseudo index value generation step S1K) by the pseudo index value generation unit 4353 actually measures (positions the liquid crystal panel 151 at the displacement position and calculates the measurement index value f based on the captured image). Instead, it is possible to generate a pseudo index value (pseudo index value) at a virtual displacement position (virtual displacement position). That is, it is possible to add pseudo data (pseudo index value) to actually measured data (measurement index value f) to increase the number of data used when calculating the focus position Zfocus.
In the processing by the focus position calculation unit 4354 (focus position calculation step S1L), the focus position is calculated by weighted average using a large amount of data (measurement index value f and pseudo index value) even though the actually measured data is small. Since Zfocus can be calculated, the focus position Zfocus can be calculated with high accuracy while reducing the adjustment time.

  In particular, in the focus position calculation step S1L, the data for which the index value is less than the threshold value ft is not used, and each difference obtained by subtracting the threshold value ft from the measurement index value f and the pseudo index value is used as a weight. Is calculated. For this reason, the weighted average value (focus position Zfocus) can be brought closer to the desired focus position as compared with a configuration in which the focus position Zfocus is calculated by weighted average using the measurement index value f and the pseudo index value as weights. The focus position can be calculated with higher accuracy.

Further, since the pseudo index value generation unit 4353 generates the pseudo index value by calculating the first order approximation function f (Z), the pseudo index value can be generated by a simple calculation.
Further, since each measurement index value f at each displacement position adjacent to the position Z on the liquid crystal panel 151 is linearly approximated and the index value on the straight line is set as a pseudo index value, the measurement is actually performed at the virtual displacement position. It is difficult for a large difference to occur between the measured index value at 1 and the pseudo index value generated as described above. Accordingly, even when the focus position Zfocus is calculated by adding the pseudo index value generated as described above to the data, the focus position Zfocus can be calculated with high accuracy.

In addition, the focus position calculation unit 4354 uses the difference obtained by subtracting the threshold value ft from the first order approximation function f (Z) as a weight, and the range of the position Z where the index value is equal to or greater than the threshold value ft, as shown in Expression (2). Since the weighted average is obtained by integrating Z _{s to} Z _e , the number of data (pseudo index values) used for calculating the focus position Zfocus can be made infinite, and the focus position Zfocus can be calculated with higher accuracy. .
Further, since the weighted average is obtained by integrating as described above, the calculated focus position Zfocus can be set to substantially the same position even when the focus adjustment is performed a plurality of times under the same conditions. it can. That is, the focus position Zfocus can be calculated with high accuracy.

The controller 40 includes an index value determination unit 4355 and the range extension section 4356, if the reference displacement position Z ₁ and each measured indicator value f of both end displacement position has not been less than the threshold ft is terminated The range W is expanded by extending the displacement position. That is, in the above case, the measurement is continued. Thus, the focus position Zfocus can be calculated in a state where the behavior of the measurement index value f can be determined, and thus the focus position Zfocus can be calculated with high accuracy.
Furthermore, since the measurement is continued in the above case, it is not necessary to restart the measurement itself from the beginning, and the adjustment time can be further shortened.
Further, since the reference displacement position Z ₁ and each measured indicator value f of both end displacement position when it becomes less than the threshold value ft, is a state that could determine the behavior of the measured index value f, takes a data unnecessarily The adjustment time can be further shortened.

Further, the control device 40 includes a threshold value calculation unit 4357, and calculates (updates) the threshold value ft sequentially by multiplying the maximum measurement index value f by a constant when the liquid crystal panel 151 is displaced. The measurement index value f varies depending on the brightness of the adjustment light source device 20 and the performance of the projection lens 160, in addition to whether the focus is achieved. Since the brightness of the adjustment light source device 20 deteriorates with time and the projection lens 160 has a variation in quality, the measurement index value f fluctuates every time (the measurement index value f at the in-focus position is The condition of increasing does not change, and the measurement index value f increases or decreases as a whole). For this reason, the focus position Zfocus is more accurately determined by setting the threshold value ft to be a fixed value, rather than a threshold value that fluctuates in accordance with the fluctuation of the measurement index value f, that is, a constant multiple of the maximum measurement index value f. It can be calculated.
If data is insufficient, data is added. At this time, the threshold value ft may fluctuate in the process of adding data, but since the threshold value ft is calculated by a constant multiple of the maximum value of the measurement index value f, the threshold value ft may increase, but the threshold value ft Does not decrease (see the threshold value ft of the broken line and the solid line in FIG. 8). Whether data is insufficient is determined based on whether the measurement index value f is equal to or less than the threshold value ft at the terminal displacement position. Therefore, even if the threshold value ft fluctuates in the process of adding data, the data A portion that is determined to have sufficient data before the addition is not determined to have insufficient data after the data is added. For this reason, it is possible to reliably add data.

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 above embodiment, when calculating the focus position Zfocus, the formula (2) is used, that is, the weighted average is obtained by integration. However, the present invention is not limited to this, and the focus position Zfocus is calculated as shown below. It doesn't matter.
That is, at least one pseudo index value at an arbitrary position Z (virtual displacement position) is generated from the primary approximation function f (Z). Then, by taking each difference obtained by subtracting the threshold value ft from each index value of each measurement index value f and pseudo index value as a weight, a weighted average of the displacement position and the virtual displacement position at which each index value is equal to or greater than the threshold value ft is obtained. The focus position Zfocus is calculated.

In the embodiment, when generating the pseudo index value, each measurement index value f at each displacement position adjacent to the position Z on the liquid crystal panel 151 is linearly approximated, and the index value on the straight line is used as the pseudo index value. However, the present invention is not limited to this, and a pseudo index value may be generated as shown below.
That is, a spline curve passing through each measurement index value f at each displacement position adjacent to the position Z is calculated. Then, the index value on the spline curve is generated as a pseudo index value.
At this time, the focus position Zfocus may be calculated by calculating the spline curve with a function and integrating the result as shown in Equation (2) to obtain a weighted average, or at least on the spline curve. The focus position Zfocus may be calculated by using one pseudo index value and taking a weighted average without integrating as described above.

In the above embodiment, as the displacement position of the design, the reference displacement position Z ₁ but nine displacement position of the ninth displacement position Z ₉ is set, the number is not limited to nine, as other numbers It doesn't matter.
In the above-described embodiment, the manufacturing apparatus 1 includes the screen Sc and captures the projected image F on the screen Sc. However, the present invention is not limited to this, and the screen Sc is omitted and emitted from the optical apparatus body 150A to be manufactured. The image light may be directly detected by an imaging device such as a CCD camera.

In the embodiment described above, the flows shown in FIGS. 6 and 7 are not limited to this, and other flows such as changing the order as appropriate may be adopted.
For example, in the above-described embodiment, the focus adjustment S1 and the alignment adjustment S2 are performed once, and then the liquid crystal panel 151 is fixed to the prism 154. However, the present invention is not limited to this, and the focus adjustment S1 and the alignment adjustment S2 are performed. Then, the focus adjustment S1 and the alignment adjustment S2 may be performed again to fix the liquid crystal panel 151 to the prism 154. If the focus adjustment S1 and the alignment adjustment S2 are repeatedly performed in this way, the liquid crystal panel 151 can be positioned at a desired position with respect to the prism 154 with high accuracy.
In the embodiment, the three position adjusting devices 10 are provided. However, the position adjusting device 10 is not limited to this, and only one position adjusting device 10 is provided, and each position of the prism 154 facing each light beam incident side end surface 154A is appropriately provided. It does not matter even if it is made to move to.

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 the above embodiment, each liquid crystal panel 151 employs a transmissive liquid crystal panel. However, the present invention is not limited to this, and a reflective liquid crystal panel 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 focus position can be calculated with high accuracy while shortening the adjustment time.

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 position of the imaging device 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. 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 for demonstrating the process by the index value determination part in the said embodiment, and the range expansion part. The figure for demonstrating the calculation method of the focus position in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus, 10 ... Position adjustment apparatus, 40 ... Control apparatus, 150 ... Optical apparatus, 151 ... Liquid crystal panel (light modulation apparatus), 154 ... Cross dichroic prism (color) Synthetic optical device), 4351, displacement position control unit, 4352, index value calculation unit, 4353, pseudo index value generation unit, 4354, focus position calculation unit, 4355, index value determination unit , 4356... Range expansion unit, 4357... Threshold calculation unit, S1E... Index value calculation step, S1H... Displacement position control step, S1K. Position calculation step.

Claims (7)

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:
A position adjusting device that adjusts the position of the light modulation device with respect to the color combining optical device; an image pickup device that is introduced into the light modulating device and picks up image light through the light modulating device and the color combining optical device; A control device for controlling the position adjustment device,
The control device includes:
A displacement position control unit that controls the position adjustment device and displaces the light modulation device in the direction of approaching and separating from the color synthesis optical device to position the light modulation device at a plurality of displacement positions;
An index value calculation unit that calculates each measurement index value indicating the contrast of each captured image captured by the imaging device when the light modulation device is positioned at each of the displacement positions;
A pseudo index value generating unit that generates a pseudo index value at a virtual displacement position between the displacement positions based on the measurement index values;
A weighted average of the displacement position and the virtual displacement position at which each index value is equal to or greater than the threshold value is obtained by weighting each difference obtained by subtracting a predetermined threshold value from each index value of each measurement index value and the pseudo index value. An optical device manufacturing apparatus comprising: a focus position calculation unit that calculates a focus position of the light modulation device in which the captured image is in focus. In the manufacturing apparatus of the optical device according to claim 1,
The pseudo index value generation unit
Calculating a first-order approximation function representing a relationship between the displacement position between the adjacent displacement positions and the measurement index value, and generating the pseudo-index value based on the first-order approximation function. Manufacturing device for optical devices. The manufacturing apparatus according to claim 2,
The pseudo index value generation unit
Generating the first-order approximation function continuous between the adjacent displacement positions;
The focus position calculation unit
The position of the light modulation device in the direction of approaching and separating from the color synthesizing optical device is Z, the linear approximation function is f (Z), the threshold is ft, and each index value is equal to or greater than the threshold ft. the range of the position Z in the case of the _Z s to Z _e, a focus position Zfocus,

An apparatus for manufacturing an optical device, characterized in that it is calculated by the formula: In the manufacturing apparatus of the optical apparatus in any one of Claims 1-3,
The displacement position controller is
Displacing the light modulator within a predetermined range;
The control device includes:
An index value determination unit that determines whether or not each of the measurement index values at the start end displacement position that is the start end within the predetermined range and the end end displacement position that is the end is less than the threshold;
A device for manufacturing an optical device, comprising: a range expansion unit that extends the terminal displacement position and expands the predetermined range when it is determined by the index value determination unit that the threshold value is not less than the threshold value. . In the manufacturing apparatus of the optical device according to claim 4,
The control device includes:
When the light modulation device is displaced within the predetermined range by the displacement position control unit, the measurement index value that is the maximum of the measurement index values at each displacement position is multiplied by a constant, and sequentially An optical device manufacturing apparatus comprising: a threshold value calculation unit that calculates the threshold value. A position adjusting device that adjusts the position of the light modulation device with respect to the color synthesis optical device; an imaging device that is introduced into the light modulation device and that captures image light through the light modulation device and the color synthesis optical device; and the position adjustment. A position adjusting method used in a manufacturing apparatus for an optical device that manufactures an optical device that includes a plurality of the light modulation devices and the color combining optical device.
The control device is
A displacement position control step of controlling the position adjustment device and displacing the light modulation device in the direction of approaching and separating the color synthesis optical device to position the light modulation device at a plurality of displacement positions;
An index value calculating step of calculating each measurement index value indicating the contrast of each captured image captured by the imaging device when the light modulation device is positioned at each of the displacement positions;
A pseudo index value generation step for generating a pseudo index value at a virtual displacement position between the displacement positions based on the measurement index values;
A weighted average of the displacement position and the virtual displacement position at which each index value is equal to or greater than the threshold value is obtained by weighting each difference obtained by subtracting a predetermined threshold value from each index value of each measurement index value and the pseudo index value. And a focus position calculation step of calculating a focus position of the light modulation device in which the captured image is in focus. A position adjusting device that adjusts the position of the light modulation device with respect to the color synthesis optical device; an imaging device that is introduced into the light modulation device and that captures image light through the light modulation device and the color synthesis optical device; and the position adjustment. A position adjustment program for use in an optical apparatus manufacturing apparatus that manufactures an optical apparatus having a plurality of the light modulation devices and the color combining optical device.
A position adjustment program that causes the control device to execute the position adjustment method according to claim 6.