JP2541115Y2 - Infinity projection display inspection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Industrial Application Field The present invention relates to an inspection device for an infinite projection display such as a helmet mount display.

Such an infinity projection display inspection apparatus can be used, for example, when measuring the viewing angle and collimation error of a helmet mounted display worn by an aircraft operator.

(2) Prior Art As shown in FIG. 9, the helmet mount display includes a combiner 01 inclined forward of the helmet wearer's field of view and information display means 03 such as a CRT supported by a helmet 02. And an optical system 04 for guiding the information displayed on the display surface of the information display means 03 to the eyes of the helmet wearer via the combiner 01. Then, the optical system 04 causes the information displayed on the display surface of the information display means 03 to be seen at infinity when viewed from the helmet wearer, that is, the information is guided as parallel rays to the helmet wearer's eyes. In addition, it is necessary that a predetermined viewing angle be obtained even if the position of the helmet mount display and the position of the eye of the helmet wearer are slightly shifted.

However, it may be difficult to adjust the optical system of the helmet mount display, and a predetermined viewing angle may not be obtained, or the information may not be guided to the eyes of the helmet wearer as parallel rays.

In such a device for inspecting the viewing angle and collimation error of the helmet mount display, the range in which the helmet wearer's eyes are present with respect to the helmet mount display, that is, the YZ plane (Y.
Z: Inside the eye box in the vertical direction (normal, diameter D ≒ 14)
Multiple positions within a circle of about mm (see Fig. 8)
In di, we are inspecting how the display symbols on the helmet mount display look.

As a method for the inspection, a conventional telescope is used, and the object lens of the telescope is arranged at a predetermined position in the eye box, and the inspector looks into the telescope while rotating the telescope about the position, and displays the display symbol. Is testing what it looks like.

However, such an inspection method is inconvenient and inefficient because the inspector has to look into the telescope to perform the inspection work throughout the inspection period. In addition, since the evaluation differs depending on the individual difference of the inspector, the inspection result tends to vary.

(3) Problems to be solved by the present invention In view of the above-mentioned circumstances, the present invention aims to enable an inspector to inspect an infinite projection display such as a helmet mount display without looking into a telescope. Make it an issue.

B. Configuration of the Invention (1) Means for Solving the Problem In order to solve the problem, the infinity projection display inspection device of the present invention is arranged on a base in X-axis, Y-axis and Z-axis directions orthogonal to each other. A translation stage supported so as to be movable and adjustable; a translation amount inspection device for detecting an amount of movement of the translation stage in the X-axis, Y-axis and Z-axis directions; and a rotation adjustment about the Y-axis and the Z-axis on the translation stage. A rotatable stage that is supported, a rotation amount detection device that detects the amount of rotation of the rotatable stage around the Y-axis and the Z-axis, and that can be moved and adjusted in the X-axis, Y-axis, and Z-axis directions on the rotary stage. A light-shielding plate for detachably mounting the light-shielding plate such that a supported position adjustment stage and a light-transmitting aperture formed in the light-shielding plate are disposed in contact with the center of the front surface of the front lens of the lens unit; A lens system unit having a mounting portion and having an optical axis in the X-axis direction supported on the position adjustment stage, an imaging device for imaging an image of light incident on the lens system unit, and an image taken by the imaging device A monitor display for displaying the projected image, and a display holding device for holding the infinity projection display such that display light from the infinity projection display enters the lens system unit from the X-axis direction of the position adjustment stage. The display pattern of the infinity projection display displayed on the display is moved by driving the translation stage and / or the rotation stage, and the optical characteristics of the infinity projection display are inspected based on the translation and / or rotation amount.

Here, the optical characteristics refer to a viewing angle of an infinite projection display, a collimation error, and the like. The display pattern of the projection display at infinity means, for example, a display symbol and an end face of the display unit.

(2) Operation The infinity projection display inspection apparatus of the present invention having the above-described configuration is used for inspecting a viewing angle or a collimation error of an infinity projection display such as a helmet mount display, instead of a telescope. And images taken using the imaging device (for example, images of display symbols on a helmet mount display)
Can be displayed on a monitor display, and the inspection can be performed while watching the display on the monitor display.

When performing such an inspection method, the center position of the front surface of the lens system of the television camera for inspection is arranged at a predetermined position in the eye box, and the lens system is centered on the center position of the front surface of the lens system. It is necessary to inspect how the captured image (image of the display symbol of the helmet mount display) looks when rotated.

For this reason, it is necessary to support the lens system of the lens system unit on the rotary stage such that the center of the front surface thereof coincides with the center of rotation of the rotary stage. Therefore, the operation of supporting the lens system of the lens system unit on the rotary stage so that the center of the front surface thereof coincides with the rotation center of the rotary stage is performed as follows.

That is, a light-shielding plate having the aperture is mounted on the light-shielding plate mounting portion, a light source for emitting a light beam is disposed in front of the optical axis of the lens system, and an optical sensor is disposed behind.

By the way, when the rotary stage is rotated while the light beam is incident on the optical sensor through the aperture of the light shielding plate (that is, the aperture is on the optical path of the laser beam), the position of the aperture is changed to the position of the rotary stage. If the center of rotation coincides with the center of rotation, there is no change in the amount of light received by the optical sensor. If not, the amount of received light decreases because the position of the aperture deviates from the optical path.

Therefore, while the position adjustment stage is moved to adjust the position of the lens system on the rotation stage, or the position of the light sensor is not changed when the rotation stage is rotated while adjusting the position of the light beam. By calculating, the position of the aperture, that is, the center position of the front surface of the lens system is made to coincide with the center of rotation of the rotary stage,
The lens system can be supported on a rotating stage.

After performing such adjustment, the display holding device holds the projection display at infinity such that display light enters the lens system unit from the X-axis direction. In this state, a predetermined pattern (for example, display symbol S) is displayed on the display surface of the projection display at infinity. The display light passes through the lens unit and is imaged by an imaging device. The video imaged by the imaging device is displayed on a monitor display.

In this state, for example, the viewing angle with respect to the infinity projection display can be inspected as follows.

The orientation of the lens system unit is adjusted so that the image on the display surface of the infinity projection display is displayed at the center of the monitor display. This operation is performed while the operator monitors the monitor display.

Next, while viewing the image of the bright display surface of the infinity projection display displayed on the monitor display with the entire display surface of the infinity projection display brightened, rotate the lens system unit around the Z axis. The rotation angle range of the lens system unit when the left end of the image on the bright display surface of the infinity projection display is displayed at a fixed position (for example, the center position) of the monitor display and then the right end is displayed (ie, The rotation amount of the rotation stage detected by the rotation amount detection device) is detected. The detected rotation angle range is the horizontal viewing angle.

Note that, as the display image of the infinity projection display, a bar-shaped pattern or a grid-like pattern displayed from the left to right ends of the entire display surface may be used instead of an image in which the entire display surface is brightened. It is possible.

In addition, while viewing the image of the bright display surface of the infinity projection display displayed on the monitor display,
The rotation angle range around the Y axis of the lens system unit when the upper and lower ends of the display pattern are displayed at a fixed position (for example, the center position) of the monitor display by rotating the lens system unit around the Y axis (ie, The rotation amount of the rotation stage detected by the rotation amount detection device) is detected. The detected rotation angle range is the vertical viewing angle.

(3) Embodiment The infinity projection display inspection apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is an overall explanatory view of an infinity projection display inspection apparatus according to the present invention. An HMD mount (mount for a helmet mount display) 2 is erected on a base 1, and the HMD mount 2 is used for infinity. An HMD (helmet mount display) 3 as a projection display is held in a predetermined posture. The HMD 3 has a built-in CRT display (not shown), and the display symbols generated by the symbol generator 4 are displayed on the CRT display via the display driver unit 5. The display driver unit 5 is controlled by a control panel 6 so that the brightness and the like are adjusted.

The base 1 is provided with a Z translation stage 7 having a built-in Z-direction moving table (not shown) that is adjusted to move in the vertical direction (Z direction) by an amount corresponding to the amount of rotation of the manual knob 7a. The Z-direction moving amount of the Z-direction moving table is controlled by the manual knob.
7a is displayed on the Z movement amount display portion 8 _Z translation amount counter 8 for counting the pulses generated each time the predetermined amount of rotation (e.g. pulses rotary encoder (not shown) is generated). Therefore, in this embodiment, the manual knob 7a
A pulse generating means (not shown) for generating a pulse each time the .phi. Rotates a predetermined amount and the translation amount counter 8 for counting the pulses constitute a translation amount detecting device in the Z-axis direction.

On the Z-direction movable stage of the Z translation stage 7, an X-directional movable stage 9b having a built-in X-directional movable stage 9b which is moved and adjusted in the front-rear direction (X direction) by an amount corresponding to the rotation amount of the manual knob 9a.
Is provided. The X-direction moving amount of the X-direction moving table is represented by an X-moving amount display unit 8 _{X of the} translation amount counter 8 that counts a pulse generated each time the manual knob 9a rotates a fixed amount.
Is displayed in.

On the X-direction moving table 9b of the X-translating stage 9, a Y-translating stage 10 having a built-in Y-direction moving table 10b moved and adjusted in the left-right direction (Y direction) by an amount corresponding to the rotation amount of the manual knob 10a is provided. Is provided. The Y-direction moving amount in the Y-direction moving table 10b is displayed on the manual knob 10a is Y movement amount display portion 8 _Y of the translation amount counter 8 for counting the pulses generated each time the predetermined amount of rotation.

In this embodiment, a pulse generator (not shown) that generates a pulse each time the manual knobs 7a, 9a, and 10a rotate by a predetermined amount, and the translation amount counter 8 that counts those pulses are used to determine the X. A translation amount detection device for detecting the movement amounts in the directions of the axis, the Y axis, and the Z axis is configured.

An AZ (Azimuth) rotation stage 11 having a built-in azimuth adjustment table (not shown) on the Y-direction movable table 10b, which is rotated around a vertical axis by an amount corresponding to the amount of rotation of the manual knob 11a.
Is provided. The rotation amount of the azimuth adjustment table is represented by an AZ (Azimuth) rotation amount display unit 1 of a rotation amount counter 12 that counts a pulse generated each time the manual knob 11a rotates a fixed amount.
2 Displayed on _AZ .

On the azimuth adjustment table of the AZ rotation stage 11, an EL (Eleva) having a built-in inclination angle adjustment table 13b that is rotated around a horizontal axis in the horizontal direction by an amount corresponding to the amount of rotation of the manual knob 13a.
tion) A rotary stage 13 is provided. The rotation amount of the tilt angle adjustment table 13b is determined by the EL of a rotation amount counter 12 that counts a pulse generated each time the manual knob 13a rotates a fixed amount.
(Elevation) Displayed on the rotation amount display section 12 _EL . The AZ rotation stage 11 and the EL rotation stage 13 constitute a rotation stage 14 of this embodiment. A pulse generating means (not shown) for generating a pulse each time the manual knobs 11a and 13a rotate by a predetermined amount, and a rotation amount counter 12 for counting those pulses, A detection device is configured.

A Z-position adjustment stage 15 having a built-in Z-direction movable table (not shown), which is vertically adjusted (Z-direction) in order from the bottom, is mounted on the tilt angle adjustment table 13b of the rotary stage 14; A Y-position adjustment stage 16 having a Y-direction movable table that is moved and adjusted in the (Y-direction); and an X-position adjustment stage 17 having an X-direction movable table that is moved and adjusted in the front-rear direction (X direction) on the Y-direction movable table. Are supported.

On the position adjustment stage 18, a lens unit 19
And a CCD (Charge Co
solid-state imaging devices such as an upled device 20 are supported. The lens system unit 19 is provided with a slit for mounting a light shielding plate described later, that is, a light shielding plate mounting portion 19a.

The display information of the HMD 3 captured by the CCD 20 is displayed on the monitor display 22 via the camera controller 21.

The helmet mount display inspection apparatus shown in FIG. 1 having the above-described configuration has the center point on the front surface of the front lens of the lens system of the lens system unit 19 coincident with the rotation center O of the AZ rotation stage 11 and the EL rotation stage 13. It is necessary to arrange it.

Next, referring to FIGS. 2 to 4, the center point of the front surface of the front lens of the lens system unit 19 is set to the center of rotation of the AZ rotation stage 11 and the EL rotation stage 13 (that is, the center of rotation of the rotation stage 14). A description will be given of a method for arranging them so as to coincide with O.

First, in a state where the HMD 3 is removed from the HMD mount 2, the lens system unit 19 is placed on the X position adjusting stage 17 of the position adjusting stage 18 supported on the tilt angle adjusting table 13 b of the rotary stage 14 so that the optical axis thereof is the X axis. It is fixed and supported so as to match the direction. At this time, the CCD 20 is detached from the lens unit 19. As shown in FIGS. 2 to 4, on the front surface of the lens at the forefront of the lens system unit 19, a light shielding plate 23a is formed in the slit (that is, a light shielding plate mounting portion) 19a.
Is mounted, and the aperture 23a of the light shielding plate 23 is arranged in contact with the center of the front surface of the frontmost lens of the lens system unit 19.

The CCD 20 is located at the rear of the lens unit 19.
Sensor unit 24 with photodiodes instead of
Attach. The light amount signal output from the optical sensor unit 24 is displayed on the display 26 via the amplifier 25.

A laser beam emitting device 27 is disposed in front of the optical axis of the lens system unit 19.

By the way, when the laser beam L is emitted from the laser beam emitting device 27 and the optical path of the laser beam L coincides with the optical axis of the lens system unit 19 as shown in FIG. Passes through the aperture 23a, and a light quantity proportional to the area of the aperture 23a enters the optical sensor unit 24.

When the aperture 23a is at the center of rotation of the rotary stage 14, even if the rotary stage 14 is rotated, for example, as shown in FIG.
Does not deviate from the optical path of the optical sensor unit 24, the detected light amount of the optical sensor unit 24 does not change.

However, for example, as shown in FIG. 5, when the aperture 23a is at a position deviated by X _O and Z _O from the rotation center O of the rotation stage 14, when the EL rotation stage 13 of the rotation stage 14 is rotated, the aperture 23a Since the position deviates from the optical path of the laser beam L, the amount of light detected by the optical sensor unit 24 decreases.

At this time, the EL rotation stage 13 is rotated while the X-position adjustment stage 17 is adjusted to gradually move the position of the lens system unit 19 in the X-axis direction, and the optical sensor unit 24 is rotated.
Find the position where the change in the detected light amount is the least.

Then, the position of the aperture 23a becomes a position deviated by Z _O from the rotation center O of the rotary stage 14 as shown in FIG. In this state shown in FIG. 6, even if the EL rotary stage 13 is slightly rotated, the position of the aperture 23a is maintained at the position of the laser beam L.
, The amount of light detected by the optical sensor unit 24 does not change much.

However, in the state shown in FIG.
When is rotated greatly, the amount of light detected by the optical sensor unit 24 decreases. Therefore, the EL rotation stage 13 is rotated while gradually adjusting the position of the laser beam L in the Z-axis direction or the Z position adjustment stage 15 to find a position where the change in the detected light amount signal of the optical sensor unit 24 is the least. At this time, the height of the laser beam L, that is, the position in the Z direction becomes the same as the height of the rotation center O together with the position of the aperture 23a.

Next, the position of the laser beam L in the Y-axis direction
The AZ rotation stage 11 is rotated while gradually adjusting the position of the position adjustment stage 16 to find the position where the change in the detected light amount signal of the optical sensor unit 24 is the least. At this time,
The position of the laser beam L in the Y direction becomes the same as the rotation center O together with the position of the aperture 23a.

By the above operation, the optical path of the laser beam L passes through the rotation center O of the rotary stage 14. In this way,
Once the positioning of the laser beam L has been performed, the operation for aligning the center point of the front surface of the front lens of the lens system of the other lens system unit 19 with the rotation center O of the rotary stage 14 is performed next. Therefore, it is not necessary to adjust the position of the laser beam L. That is, once the laser beam L is positioned, the Z position adjustment stage 15,
By simply adjusting the positions of the Y position adjustment stage 16 and the X position adjustment stage 17, the center point on the front surface of the frontmost lens of the lens system of the lens system unit 19 can be matched with the rotation center O of the rotation stage 14. become.

Next, as described above, after the center point of the front surface of the forefront lens of the lens system unit 19 on the position adjustment stage 18 is aligned with the rotation center O of the rotation stage 14, the HMD ( The case where the inspection of the helmet mount display 3 is performed will be described.

When the inspection of the HMD 3 is started, first, the optical sensor unit 24 mounted on the rear surface of the lens system unit 19 is removed and the light shielding plate 23 is removed.

Then, as shown in FIG.
19 The CCD 20 is mounted on the rear surface, and the HMD 3 is mounted on the HMD mount 2.

In that state, the field of view of HMD3, eye box (EYE BOX)
And check for collimation errors.
Next, these inspection methods will be described step by step.

(A) Visual field inspection (A ₁ ) Cross hatch measurement point P as shown in FIG.
Is displayed.

(A ₂ ) Next, the manual knob 7 is adjusted so that the crosshair S _O always displayed at the center of the monitor display 22 and the center of the display symbol S coincide with each other on the monitor display 22.
a, 9a, 10a, 11a and 13a to rotate the Z, X, Y translation stage
The positions or postures of the AZ rotation stage 11 and the EL rotation stage 13 are adjusted.

(A ₃ ) Then, at this time, the reset buttons of the translation amount counter 8 and the rotation amount counter 12 are pressed to set the display values of those counters to zero.

(A ₄ ) Next, the brightness is maximized, and the manual knob 13 a of the EL rotary stage 13 is turned to the right until the end face of the CRT tube built in the HMD 3 matches the cross hair S _O of the monitor display 22.
The numerical value displayed on the EL rotation amount display section 12 _EL at this time is α.

(A ₅₎ in the same manner as the (A _4), turn the manual knob 13a of the EL rotary stage 13 on the left side to the end face of the CRT tube face built in HMD3 matches crosshair S _O of the monitor display 22.
The numerical value displayed on the EL rotation amount display section 12 _EL at this time is β.

(A ₆ ) α-β is the size of the visual field in the EL direction (vertical direction).

(A ₇₎ to check the size of the field in the same procedure also AZ direction (lateral direction).

(B) Inspection of eye box (EYE BOX) (B ₁ ) Cross hatch measurement point P as shown in FIG.
Is displayed.

(B ₂ ) Next, the manual knob 7 is adjusted so that the center of the display symbol S and the crosshair S _O constantly displayed at the center of the monitor display 22 match on the monitor display 22.
a, 9a, 10a, 11a and 13a to rotate the Z, X, Y translation stage
The positions or postures of the AZ rotation stage 11 and the EL rotation stage 13 are adjusted.

(B ₃ ) Next, at this time, the reset buttons of the translation amount counter 8 and the rotation amount counter 12 are pressed to set the display values of those counters to zero.

(B ₄ ) Next, maximize the brightness and set the monitor display 22
Is turned to the right until the display symbol S displayed on the right side disappears. The displayed number to the Y moving amount display portion 8 _Y at this time is a.

(B ₅₎ in the same manner as the (B _4), the monitor display 22
Turn the manual knob 10a of the Y translation stage 10 to the left until just before the display symbol S displayed on the Y-axis becomes invisible. The displayed number to the Y moving amount display portion 8 _Y at this time is b.

(B ₆ ) ab is the size of the eye box in the Y direction (left-right direction).

(B ₇₎ Z direction (vertical direction) to inspect the extent of the eye box in the same procedure also.

(C) Inspection of collimation error (C ₁ ) Cross-hatch measurement point P as shown in FIG.
Is displayed.

(C ₂ ) Next, the manual knob 7 is adjusted so that the center of the display symbol S and the crosshair S _O always displayed at the center of the monitor display 22 match on the monitor display 22.
a, 9a, 10a, 11a and 13a to rotate the Z, X, Y translation stage
The positions or postures of the AZ rotation stage 11 and the EL rotation stage 13 are adjusted.

(C ₃ ) Next, at this time, the reset buttons of the translation amount counter 8 and the rotation amount counter 12 are pressed to set the display values of those counters to zero.

(C ₄ ) Next, set the appropriate brightness, and
As the cross-hairs S _O that appears in the center of one and always monitor display 22 in the crosshatched measurement point P of the display symbols S displayed matches on the monitor display 22, the manual knob 11a and Turn 13a to turn the AZ
The position or posture of the rotation stage 11 and the EL rotation stage 13 are adjusted. Numerical value at this time is displayed in the AZ rotation amount display unit 12 _AZ and EL rotation amount display unit 12 _EL rotation amount counter 12 is the viewing angle of the crosshatched measurement point P.

(C ₅ ) Next, press the reset button of the rotation amount counter 12
The numerical value displayed on the AZ rotation amount display section 12 _AZ and the EL rotation amount display section 12 _EL is set to 0.

(C ₆ ) Next, the manual knobs 10a of the Y translation stage 10 and the Z translation stage 7 up to predetermined measurement positions (indicated by nine circles) di in an eye box having a diameter D (D ≒ 14 mm) shown in FIG. And 7a to rotate the lens unit 19 and the CCD 20.
Is moved to the position of the small video camera K composed of.

When (C ₇₎ the miniature video camera K in (C ₆₎ at a predetermined measurement position di moves, when the crosshatched measurement point P of the display symbol S the crosshair S _O is misaligned, they match AZ rotating stage 11 and EL
The manual knobs 11a and 13a of the rotary stage 13 are turned. Display value of AZ and EL rotation amount display unit 12 _AZ and 12 _EL at this time becomes the collimation errors.

(C ₈ ) The above-described measurement of the collimation error is performed for all the measurement positions di shown in FIG. 8 and all the cross hatch measurement points P shown in FIG.

As described above, the embodiment of the apparatus for adjusting the position of the lens system on the rotary stage according to the present invention has been described in detail. However, the present invention is not limited to the above-described embodiment, and is described in the claims for utility model registration. Various design changes can be made without departing from the invention.

For example, the rotary stage 11 can be configured to support the AZ rotary stage 11 on the EL rotary stage 13 instead of supporting the EL rotary stage 13 by the AZ rotary stage 11, and to adjust the position. Stage 18 is Z
Instead of a configuration in which the Y and X position adjustment stages 16 and 17 are sequentially supported on the position adjustment stage 15, a configuration in which the Z and X position adjustment stages are sequentially supported on the Y position adjustment stage may be used. Further, the X, Y, and Z movement amounts and the AZ and EL rotation amounts displayed by the translation amount display device 8 and the rotation amount display device 12 can be displayed on a monitor display. The translation amount display device 8 and the rotation amount display device 12 can be omitted. In addition, by using a computer to operate the entire apparatus according to a computer program, it is possible to automate the inspection of a projection display at infinity.

C. Effects of the Invention The infinity projection display inspection device of the present invention
The use of the lens unit and the imaging device eliminates the need for the inspector to look into the telescope during the inspection work. Therefore, the inspection work becomes easier and the work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of an infinity projection display inspection apparatus according to the present invention, FIG. 2 is a plan view of a use state when determining a support position of a lens system in the embodiment, FIG. FIG. 4 is a view showing a state different from FIG. 2 in the plan view, and FIGS. 5 and 6 are views for explaining a method of determining a support position of the lens system in the embodiment, FIGS. FIG. 8 is an explanatory view of the operation of the infinity projection display inspection apparatus of FIG. 1, and FIG. 9 is an explanatory view of a helmet mount display (infinity projection display). 14 ... Rotating stage, 18 ... Position adjustment stage, 19 ...
Lens unit, 19a… Shield plate mounting part, 23… Shield plate, 23a… aperture

Claims (1)

(57) [Scope of request for utility model registration] 1. A translation stage supported on a base so as to be movable in X, Y, and Z directions orthogonal to each other, and detecting the amount of movement of the translation stage in the X, Y, and Z axes. A translation amount detecting device, a rotation stage supported on the translation stage so as to be able to rotate around the Y axis and the Z axis, and a Y of the rotation stage.
A rotation amount detection device for detecting a rotation amount around the axis and the Z axis; a position adjustment stage supported on the rotation stage so as to be movable and adjustable in the X-axis, Y-axis, and Z-axis directions; A light-shielding plate mounting portion for detachably mounting the light-shielding plate so that an aperture for light transmission is disposed in contact with a front center portion of a front lens of the lens unit, and supported on the position adjustment stage; A lens unit having an optical axis in the X-axis direction, an imaging device for capturing an image of light incident on the lens system unit, a monitor display for displaying an image captured by the imaging device, and an infinity projection display Holding device for holding a projection display at infinity so that display light from the lens enters the lens unit from the X-axis direction of the position adjustment stage. The provided, the display pattern of infinite Totoutsu display to be displayed on the monitor display is moved by the drive of the translation stage and / or rotation stage, the translational and /
Alternatively, an inspection device for infinity projection display, wherein the optical characteristic of the infinity projection display is inspected from the rotation amount.