JP6784293B2 - Optical property measuring device - Google Patents

Description

The present invention relates to a technique for measuring the optical characteristics of an exit pupil of a virtual image display device.

The virtual image projection type head-mounted display is an example of a virtual image display device, and displays a virtual image of an image displayed on an image display unit (for example, a liquid crystal display) of the head-mounted display. When the human pupil is positioned at the exit pupil of the head-mounted display while the head-mounted display displays the virtual image, the human can see the virtual image.

Devices capable of measuring the optical characteristics (for example, brightness and chromaticity) of an image display device such as the liquid crystal display are disclosed in, for example, Patent Document 1 and Patent Document 2. Patent Document 1 discloses an optical characteristic measuring device capable of forming an image of a measurement target on a two-dimensional sensor and measuring the brightness and chromaticity of the measurement target in two dimensions.

Patent Document 2 describes an aperture mirror, an objective lens that forms an image of an object to be measured on the aperture mirror, a finder system that displays the image of the object to be measured by using the light reflected by the aperture mirror, and an aperture mirror. A brightness meter including a light receiving element that receives light that has passed through is disclosed. In this luminance meter, the image to be measured is imaged on the aperture mirror, not on the light receiving element.

Ideally, the brightness and chromaticity on the exit pupil of the head-mounted display are uniform. However, the optical system provided in the virtual image projection type head-mounted display is complicated, and as a result, the brightness and chromaticity on the exit pupil are non-uniform.

The size of the human pupil changes according to the brightness of the surroundings. When the surroundings are bright, the eyes become smaller, and when the surroundings are dark, the eyes become larger. The range in which the size of the pupil changes is generally in the range of 2 mm to 7 mm in diameter. The exit pupil of a head-mounted display is usually larger than the human pupil. Therefore, when the brightness and chromaticity on the exit pupil are non-uniform, the brightness and chromaticity of the virtual image appear different when the position of the pupil moves. Therefore, a device capable of measuring the brightness and chromaticity of each position on the exit pupil of the head-mounted display is desired.

International Publication No. 2015/182571 Japanese Unexamined Patent Publication No. 63-259425

An object of the present invention is to provide an optical characteristic measuring device capable of measuring the optical characteristics of each position on the exit pupil of the virtual image display device.

The optical characteristic measuring apparatus according to the present invention that achieves the above object includes an imaging optical system, a diaphragm unit, an image sensor, and a calculation unit. The imaging optical system displays the virtual image formed by light passing through the position of the exit pupil in a state where the virtual image that can be seen from the position of the exit pupil of the virtual image display device is displayed by the virtual image display device. , Image is formed at a predetermined position. The throttle portion is arranged at the predetermined position and has an opening through which light constituting a part of the virtual image formed at the predetermined position is passed. The image sensor receives light that has passed through the aperture and has spread to form the part thereof. The calculation unit calculates the optical characteristics of each position on the exit pupil by using the signal output from the image sensor.

The above and other objectives, features and advantages of the present invention will become apparent from the following detailed description and accompanying drawings.

It is a schematic diagram which shows the state which a human is looking at the virtual image displayed by the head-mounted display (HMD) of the virtual image projection type. It is a block diagram which shows the structure of the optical characteristic measuring apparatus which concerns on 1st to 5th Embodiment. It is a block diagram which shows the structure of the light receiving part provided in the optical characteristic measuring apparatus which concerns on 1st Embodiment. It is a top view of the exit pupil seen from the direction of the optical axis. It is explanatory drawing explaining the course of light La in 1st Embodiment. It is explanatory drawing explaining the course of light Lb in 1st Embodiment. It is explanatory drawing explaining the course of light Lc in 1st Embodiment. It is a top view of the exit pupil seen from the direction of the optical axis, and the light La, the light Lb, and the light Lc seen from the direction of the optical axis at the position of the exit pupil. It is explanatory drawing explaining the maximum diameter of the exit pupil which can measure by an optical characteristic measuring apparatus. It is explanatory drawing explaining the relationship of a focal length L2, a distance L3, etc. in the measurement of an exit pupil having a diameter of 20 mm. It is explanatory drawing explaining the method of measuring the brightness of each position on the exit pupil about the light which constitutes the peripheral part of the image displayed on the image display part. It is a block diagram which shows the structure of the light receiving part provided in the optical characteristic measuring apparatus which concerns on 2nd Embodiment. In the second embodiment, it is explanatory drawing explaining the course of light La when the second diaphragm part and the 2D image sensor are moved to the position where light La can pass through an opening. In the second embodiment, it is explanatory drawing explaining the course of light Lc when the 2nd diaphragm part and 2D image sensor are moved to the position where light Lc can pass through an opening. It is a block diagram which shows the structure of the light receiving part provided in the optical characteristic measuring apparatus which concerns on 3rd Embodiment. It is explanatory drawing explaining the course of light La in 3rd Embodiment. It is a block diagram which shows the structure of the light receiving part provided in the optical characteristic measuring apparatus which concerns on 4th Embodiment. It is explanatory drawing explaining the course of light Lb and light Lc in 4th Embodiment. It is explanatory drawing explaining the course of light La in 4th Embodiment. It is a block diagram which shows the structure of the light receiving part provided in the optical characteristic measuring apparatus which concerns on 5th Embodiment in the measurement mode of the luminance and chromaticity of each position on an exit pupil. It is explanatory drawing explaining the course of light La in the measurement mode of the luminance and chromaticity of each position on an exit pupil. It is a block diagram which shows the structure of the light receiving part provided in the optical characteristic measuring apparatus which concerns on 5th Embodiment in the mode which measures the luminance and chromaticity of each position on the image displayed on the image display part. It is explanatory drawing explaining the course of light La, Lb, Lc in the mode of measuring the luminance and chromaticity of each position on the image displayed on the image display part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the configurations with the same reference numerals indicate that they are the same configuration, and the description of the configurations already described will be omitted.

Embodiments of the present invention include first to fifth embodiments. The object measured by these embodiments is a virtual image display device. Examples of the virtual image display device include a virtual image projection type head-mounted display and a virtual image type optical finder. Here, the former will be described as an example. FIG. 1 is a schematic view showing a state in which a human is viewing a virtual image VI displayed by a virtual image projection type head-mounted display (hereinafter, HMD) 20.

The HMD 20 includes an image display unit 21 and an optical system 22. The image display unit 21 is, for example, a liquid crystal display. Among the lights constituting the image displayed on the image display unit 21, light La, light Lb, and light Lc are shown. The light La, the light Lb, and the light Lc are all lights that form a part of an image. Therefore, the light La, the light Lb, and the light Lc are the lights that form a part of the virtual image VI.

When a part is expressed as a spot, the light La is light that constitutes a spot located at the center of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. The light Lb is light that constitutes a spot located above the center of the image (virtual image VI) among the spots constituting the peripheral portion of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. is there. The light Lc is light that constitutes a spot located below the center of the image (virtual image VI) among the spots that constitute the peripheral portion of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. Is.

The optical system 22 generates a virtual image VI of the image displayed on the image display unit 21. In FIG. 1, one lens is shown as the optical system 22, but the optical system 22 is composed of a large number of optical components (aperture, lens, etc.) (not shown). The exit pupil 23 of the HMD 20 is an image of the diaphragm formed by a lens located on the image side of the diaphragm (in other words, located behind the diaphragm). When the human pupil is positioned on the exit pupil 23 while the HMD 20 displays the virtual image VI, the human can see the virtual image VI.

FIG. 2 is a block diagram showing the configuration of the optical characteristic measuring device 101 according to the first embodiment. FIG. 2 is also a block diagram showing the configuration of the optical characteristic measuring devices 102 to 105 according to the second to fifth embodiments. The optical characteristic measuring device 101 according to the first embodiment includes a light receiving unit 1, a control calculation unit 3, an input unit 5, and an output unit 7.

The light receiving unit 1 will be described first. FIG. 3 is a block diagram showing a configuration of a light receiving unit 1 provided in the optical characteristic measuring device 101 according to the first embodiment. The optical characteristic measuring device 101 is a device for measuring brightness, and is a first diaphragm portion 10, an objective lens 11, a visibility filter 12, a second diaphragm portion 13, and a second diaphragm portion 13 arranged in order along the optical axis Ax. A two-dimensional image sensor 14 is provided.

In FIG. 3, similarly to FIG. 1, light La, light Lb, and light Lc are illustrated among the lights constituting the image displayed on the image display unit 21 of the HMD 20. The light constituting the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21 passes through the exit pupil 23 of the HMD 20 and is incident on the optical characteristic measuring device 101 from the first diaphragm unit 10. When the distance L1 between the first diaphragm portion 10 and the virtual image VI is infinite (∞), the light passing through the position of the exit pupil 23 becomes parallel light. In reality, the distance L1 is often finite, and the light passing through the position of the exit pupil 23 is divergent light. FIG. 4 is a plan view of the exit pupil 23 as viewed from the direction of the optical axis Ax. The exit pupil 23 has a circular shape when viewed from the direction of the optical axis Ax (in the case of an axisymmetric optical system).

With reference to FIG. 3, the first diaphragm portion 10 has an opening 10a for passing light incident on the optical characteristic measuring device 101. The first diaphragm portion 10 has a function of regulating the light incident on the optical characteristic measuring device 101.

The objective lens 11 is an example of an imaging optical system, and in a state where the virtual image VI is displayed by the HMD 20, a virtual image VI composed of light passing through the position of the exit pupil 23 is imaged at a predetermined position. The distance between the predetermined position and the objective lens 11 is the focal length L2 of the objective lens 11.

The luminosity factor filter 12 is arranged in an optical path between the objective lens 11 and the second diaphragm portion 13, and light passing from the objective lens 11 to the second diaphragm portion 13 passes through. The luminosity factor 12 is a kind of color filter, and is a filter that corrects the sensitivity of the two-dimensional image sensor 14 so as to match the luminosity factor of human beings. The position where the luminosity factor 12 is arranged is not limited to between the objective lens 11 and the second aperture portion 13, but is arranged in the optical path between the first aperture portion 10 and the two-dimensional image sensor 14. Can be done.

The second diaphragm portion 13 functions as a field diaphragm of the objective lens 11. The second throttle portion 13 is arranged at the predetermined position. Therefore, the distance between the second diaphragm portion 13 and the objective lens 11 is the focal length L2. When the virtual image VI is displayed by the HMD 20, the objective lens 11 forms an image of the virtual image VI composed of the light passing through the position of the exit pupil 23 on the second diaphragm portion 13. In other words, the light constituting the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21 passes through the position of the exit pupil 23 and is imaged at the position of the second aperture unit 13. The second diaphragm portion 13 has an opening 13a through which light constituting a part of the virtual image VI is passed. FIG. 3 shows a case where the light forming a part of the virtual image VI is light La.

The two-dimensional image sensor 14 is an example of an image sensor, and is arranged at a position separated from the second throttle portion 13 by a predetermined distance L3. The light forming a part of the virtual image VI becomes divergent light after passing through the opening 13a and is received by the two-dimensional image sensor 14. In this way, the two-dimensional image sensor 14 passes through the opening 13a and receives the light that forms a part of the spread virtual image VI. The spread light is not limited to divergent light, but may be parallel light. The two-dimensional image sensor 14 is, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary MOS), and is an optical sensor having a two-dimensional region as a measurement range.

With reference to FIG. 2, the control calculation unit 3 is a microcomputer realized by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and operates the optical characteristic measuring device 101. The control required for the above and various calculations (for example, brightness calculation) are executed.

The input unit 5 is a device for inputting commands (commands), data, and the like from the outside to the optical characteristic measuring device 101, and is realized by a keyboard. The touch panel may be the input unit 5. The output unit 7 is a device for outputting commands and data input from the input unit 5, calculation results of the control calculation unit 3, and the like, and is realized by a display. A printing device such as a printer may be used as the output unit 7.

The paths of the light La, the light Lb, and the light Lc shown in FIG. 3 will be described. FIG. 5 is an explanatory diagram for explaining the path of the optical La. FIG. 6 is an explanatory diagram for explaining the path of the optical Lb. FIG. 7 is an explanatory diagram for explaining the path of the optical Lc. In these figures, some optical components (for example, the objective lens 11 shown in FIG. 3) located in the path of light are not shown. The light La, the light Lb, and the light Lc are parallel light at the position of the exit pupil 23, and are light gathered at one point at the position of the second diaphragm portion 13. The paths of the light Lb and the light Lc are blocked by the second diaphragm portion 13, but the light La passes through the opening 13a and becomes divergent light at the position of the two-dimensional image sensor 14. The center of the exit pupil 23 is the position P1. The two points that define the diameter of the exit pupil 23 are the position P2 and the position P3.

FIG. 8 is a plan view of the exit pupil 23 seen from the direction of the optical axis Ax, and the light La, the light Lb, and the light Lc seen from the direction of the optical axis Ax at the position of the exit pupil 23. The exit pupil 23, the light La, the light Lb, and the light Lc have circular shapes having the same area and overlap each other in the case of an ideal optical system when viewed from the direction of the optical axis Ax (actually). May not be circular or may not overlap).

With reference to FIGS. 5 and 8, the light La is divergent light at the position of the two-dimensional image sensor 14, and the divergent light is received by the two-dimensional image sensor 14. The luminance distribution of this divergent light corresponds to the luminance distribution of the exit pupil 23. For example, the position P1 on the exit pupil 23 corresponds to the position p1 on the two-dimensional image sensor 14, the position P2 on the exit pupil 23 corresponds to the position p2 on the two-dimensional image sensor 14, and is on the exit pupil 23. The position P3 corresponds to the position p3 on the two-dimensional image sensor 14. Therefore, the luminance calculated by the control calculation unit 3 shown in FIG. 2 using the light receiving signal at the position p1 of the two-dimensional image sensor 14 indicates the brightness at the position P1 and is calculated using the light receiving signal at the position p2. The brightness indicates the brightness at the position P2, and the brightness calculated using the received signal at the position p3 indicates the brightness at the position P3.

The control calculation unit 3 is an example of a calculation unit, and when the two-dimensional image sensor 14 is receiving light La, the light-receiving signal output from the two-dimensional image sensor 14 is used to display each of the light-receiving signals on the exit pupil 23. Calculate the brightness of the position. The output unit 7 outputs the result of this calculation.

As described above, with reference to FIG. 3, the light constituting the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21 passes through the position of the exit pupil 23 and is the second diaphragm. An image is formed at the position of the portion 13. The light (here, light La) forming a part of the virtual image VI formed at this position is parallel light having a predetermined spread at the position of the exit pupil 23. This parallel light is the light distributed throughout the exit pupil 23 when viewed from the front of the exit pupil 23 (FIG. 8). The light that constitutes the above part is the light that spreads at the position of the two-dimensional image sensor 14. The present inventor uses the light receiving signal output from the two-dimensional image sensor 14 that receives this light to display each position on the exit pupil 23 (each on the virtual image VI) in a state where the HMD 20 is displaying the virtual image VI. It was found that the optical characteristics (not the position) are required. The first embodiment is a case where the optical characteristic is luminance. As described above, according to the optical characteristic measuring device 101 according to the first embodiment, the brightness of each position on the exit pupil 23 of the HMD 20 can be measured.

The brightness distribution on the exit pupil 23 is obtained by the brightness of each position on the exit pupil 23. Since the optical characteristic measuring device 101 according to the first embodiment uses the two-dimensional image sensor 14 as the image sensor, the brightness distribution on the exit pupil 23 is a two-dimensional brightness distribution. A line sensor can be used instead of the two-dimensional image sensor 14. In the case of the line sensor, since the measurement range is one-dimensional, the brightness of each position on the exit pupil 23 is measured not in two dimensions but in one dimension. Therefore, the luminance distribution on the exit pupil 23 is a one-dimensional luminance distribution.

The maximum diameter of the exit pupil 23 that can be measured by the optical characteristic measuring device 101 will be described. FIG. 9 is an explanatory diagram illustrating this. In FIG. 9, reference numeral P4 and the like are added to FIG. When the distance L1 (FIG. 3) between the first diaphragm portion 10 and the virtual image VI is infinite, the optical characteristic measuring device 101 has an exit pupil 23 having a diameter substantially the same as the diameter of the opening 10a of the first diaphragm portion 10. The brightness of each position on the exit pupil 23 can be measured. The diameter substantially the same as the diameter of the opening 10a is the diameter of the exit pupil 23 defined by the positions P4 and P5.

The position P4 corresponds to the position p4 on the two-dimensional image sensor 14, and the position P5 corresponds to the position p5 on the two-dimensional image sensor 14. Therefore, the luminance calculated by the control calculation unit 3 shown in FIG. 2 using the light receiving signal at the position p4 of the two-dimensional image sensor 14 indicates the brightness at the position P4, and is calculated using the light receiving signal at the position p5. The brightness indicates the brightness at position P5.

When the distance L1 is finite (for example, 1 to 2 m), the optical characteristic measuring device 101 measures the brightness of each position on the exit pupil 23 with respect to the exit pupil 23 having a diameter slightly smaller than the diameter of the opening 10a. Can be done.

Specific values will be described for the maximum diameter of the exit pupil 23 that can be measured by the optical characteristic measuring device 101. The diameter of the exit pupil 23 of a general HMD 20 is 2 mm to 15 mm. Therefore, it is desirable that the maximum diameter of the exit pupil 23 that can be measured by the optical characteristic measuring device 101 is about 20 mm. The size of the focal length L2, the distance L3, and the two-dimensional image sensor 14 for realizing this will be described. FIG. 10 is an explanatory diagram illustrating this. Let H be the height of the exit pupil 23 with respect to the optical axis Ax, and let D be the distance on the two-dimensional image sensor 14 with reference to the center of the two-dimensional image sensor 14. The following equation 1 holds for the focal length L2, the distance L3, the height H, and the distance D.

When the maximum diameter of the exit pupil 23 is 20 mm, the height H is 10 mm. When the focal length L2 is 50 mm and the distance L3 is 9 mm, the distance D is 1.8 mm. Therefore, if the two-dimensional image sensor 14 having a size of 1/3 inch or more is used, the maximum diameter of the measurable exit pupil 23 can be set to about 20 mm. The size of 1/3 inch means a width of 4.8 mm and a height of 3.6 mm.

The measurement angle of the optical characteristic measuring device 101 will be described with reference to FIG. When the measurement angle is θ and the diameter of the opening 13a of the second throttle portion 13 is d, the measurement angle θ is expressed by the following equation 2.

As the measurement angle θ becomes smaller, the luminance distribution of the divergent light received by the two-dimensional image sensor 14 becomes clearer, so that the luminance distribution of the exit pupil 23 is shown more clearly. However, as the measurement angle θ becomes smaller, the amount of divergent light received by the two-dimensional image sensor 14 becomes smaller. Therefore, it is necessary to set the measurement angle θ in consideration of these.

Focusing will be described. With reference to FIG. 3, the measurer sets the position of the objective lens 11 in order to form a virtual image VI composed of the light passing through the position of the exit pupil 23 on the second diaphragm portion 13. (Focusing). The optical characteristic measuring device 101 does not have a finder that allows the measurer to confirm the position of the virtual image VI. Therefore, the measurer sets the position of the objective lens 11 in consideration of the distance L1 between the first diaphragm portion 10 and the virtual image VI.

The aperture diaphragm will be described. With reference to FIG. 3, in the optical characteristic measuring device 101, the aperture 10a of the first diaphragm portion 10 does not function as an aperture diaphragm (aperture diaphragm of the objective lens 11). The light receiving area of each pixel constituting the two-dimensional image sensor 14 functions as an aperture diaphragm. Therefore, even if the position of the objective lens 11 is changed in order to focus, the amount of light incident on each pixel constituting the two-dimensional image sensor 14 does not change.

In FIG. 3, the brightness of each position on the exit pupil 23 is measured with respect to the light La constituting the central portion of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. A method of measuring the brightness of each position on the exit pupil 23 of the HMD 20 with respect to the light constituting the peripheral portion of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21 will be described. FIG. 11 is an explanatory diagram illustrating this method. The light receiving portion 1 of the optical characteristic measuring device 101 is arranged at a slight inclination. By rotating the light receiving unit 1 or the HMD 20, the measurer can measure the brightness of each position on the exit pupil 23 of the HMD 20 with respect to the light constituting the peripheral portion. In FIG. 11, of the light La, the light Lb, and the light Lc, the light Lc passes through the opening 13a, diffuses into divergent light, and is received by the two-dimensional image sensor 14.

The second embodiment will be described. As described above, in the first embodiment, the measurer rotates the light receiving unit 1 or the HMD 20 to measure the brightness of each position on the exit pupil 23 with respect to the light constituting the peripheral portion. In the second embodiment, the positions of the second aperture 13 and the two-dimensional image sensor 14 are moved, and the brightness of each position on the exit pupil 23 of the HMD 20 is measured with respect to the light constituting the peripheral portion.

FIG. 12 is a block diagram showing a configuration of a light receiving unit 1 provided in the optical characteristic measuring device 102 according to the second embodiment. The difference from the optical characteristic measuring device 101 according to the first embodiment shown in FIG. 3 will be described. The axes that define the plane perpendicular to the direction of the optical axis Ax are the x-axis and the y-axis. The light receiving unit 1 includes a second throttle unit 13 and a moving unit 15 for moving the two-dimensional image sensor 14.

The moving unit 15 is a position where light (for example, light Lc) constituting another part different from a part of the virtual image VI imaged at the position (predetermined position) of the second diaphragm portion 13 can pass through the opening 13a. The second diaphragm portion 13 is moved.

The moving unit 15 will be described in detail. The moving unit 15 includes a holding plate 150, a stepping motor M1 and a stepping motor M2. The holding plate 150 holds the second drawing portion 13 and the two-dimensional image sensor 14. The stepping motor M1 generates power to move the holding plate 150 along the x-axis direction. As the stepping motor M1 rotates, the holding plate 150 moves along the x-axis direction. The stepping motor M2 generates power to move the holding plate 150 along the y-axis direction. As the stepping motor M2 rotates, the holding plate 150 moves along the y-axis direction.

The moving unit 15 can move the positions of the second narrowing unit 13 and the two-dimensional image sensor 14. As a result, among the lights constituting the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21, the light passing through the opening 13a can be selected. FIG. 13 is an explanatory diagram illustrating the course of the light La when the second diaphragm portion 13 and the two-dimensional image sensor 14 are moved to a position where the light La can pass through the opening 13a. FIG. 14 is an explanatory diagram illustrating the course of the light Lc when the second diaphragm portion 13 and the two-dimensional image sensor 14 are moved to a position where the light Lc can pass through the opening 13a. In FIGS. 13 and 14, some optical components (for example, the objective lens 11 shown in FIG. 12) located in the path of light are not shown. As shown in FIG. 13, of the light constituting the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21, the light La passes through the opening 13a and diffuses to form the two-dimensional image sensor 14. Is being received by. As shown in FIG. 14, of the light constituting the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21, the light Lc passes through the opening 13a and diffuses to form the two-dimensional image sensor 14. Is being received by.

As described above, according to the second embodiment, the second diaphragm portion 13 is moved to a position where the light (for example, the light Lc) constituting the other part of the virtual image VI can pass through the opening 13a. Can be done. Therefore, with respect to the light that constitutes a part of the virtual image VI (for example, the light La that constitutes the central portion of the virtual image VI), the brightness of each position on the ejection pupil 23 is measured, or another part of the virtual image VI is formed. With respect to light (for example, light Lc constituting a peripheral portion of a virtual image), the brightness of each position on the ejection pupil 23 can be measured.

The moving unit 15 automatically moves the second throttle unit 13 and the two-dimensional image sensor 14 by the stepping motor M1 and the stepping motor M2. Instead of the moving unit 15, the second aperture unit 13 and the two-dimensional image sensor 14 may be manually moved.

If the size of the two-dimensional image sensor 14 is large, only the second throttle portion 13 may be moved without moving the two-dimensional image sensor 14.

In the optical characteristic measuring device 102 according to the second embodiment shown in FIG. 12, the front focal position of the objective lens 11 is at the position of the aperture 10a. As a result, when the exit pupil 23 of the HMD 20 is positioned at the opening 10a, the optical system becomes an image-side telecentric optical system (this also applies to the third to fifth embodiments described later). Therefore, the above equation 1 also holds for the light constituting the peripheral portion of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. Therefore, even when measuring the brightness of each position on the exit pupil 23 with respect to the light constituting the peripheral portion, the position on the two-dimensional image sensor 14 and the position on the exit pupil 23 can be made to correspond to each other.

The third embodiment will be described. FIG. 15 is a block diagram showing a configuration of a light receiving unit 1 provided in the optical characteristic measuring device 103 according to the third embodiment. The optical characteristic measuring device 103 according to the third embodiment is a colorimeter capable of measuring brightness and chromaticity, and includes an optical finder (observation optical system 18a) capable of observing a virtual image VI by a measurer. The difference from the optical characteristic measuring device 101 according to the first embodiment shown in FIG. 3 will be described.

With reference to FIG. 15, the front focal position of the objective lens 11 is at the position of the aperture 10a. This is the same as the optical characteristic measuring device 102 according to the second embodiment shown in FIG.

In the optical characteristic measuring device 103 according to the third embodiment, the second diaphragm portion 13 is an aperture mirror, includes a mirror portion 13b located around the opening 13a and reflecting light. The mirror portion 13b reflects light other than the light that has passed through the opening 13a in the light that constitutes the virtual image VI imaged at the position (predetermined position) of the second diaphragm portion 13. In other words, the mirror unit 13b reflects the light that constitutes the rest of the virtual image VI imaged at the position of the second diaphragm unit 13. The second diaphragm portion 13 is arranged at an angle of 45 degrees with respect to the optical axis Ax.

The light receiving unit 1 of the optical characteristic measuring device 103 does not include the luminosity factor 12 and the two-dimensional image sensor 14 shown in FIG. 3, and includes a relay lens 16, a mirror 17a, a mirror 17b, an X filter 121, a Y filter 122, and Z. It includes a filter 123 and two-dimensional image sensors 141, 142, and 143.

The relay lens 16, the mirror 17a, and the mirror 17b are arranged in this order in the optical path of the light passing through the opening 13a. The relay lens 16 converts the light that has passed through the aperture 13a into parallel light or divergent light and guides the light to the mirror 17a.

The mirror 17a and the mirror 17b are arranged at an angle of 45 degrees with respect to the optical axis Ax. The mirror 17a is a mirror having a reflectance of 33% and a transmittance of 66%. The mirror 17b is a mirror having a reflectance of 50% and a transmittance of 50%. The X filter 121 and the two-dimensional image sensor 141 are arranged in this order in the optical path of the light reflected by the mirror 17a. The light reflected by the mirror 17a passes through the X filter 121 and is received by the two-dimensional image sensor 141.

The light transmitted through the mirror 17a is half reflected and half transmitted by the mirror 17b. The Y filter 122 and the two-dimensional image sensor 142 are arranged in this order in the optical path of the light reflected by the mirror 17b. The light reflected by the mirror 17b passes through the Y filter 122 and is received by the two-dimensional image sensor 142.

The Z filter 123 and the two-dimensional image sensor 143 are arranged in this order in the optical path of the light transmitted through the mirror 17b. The light transmitted through the mirror 17b passes through the Z filter 123 and is received by the two-dimensional image sensor 143.

Among the lights forming the virtual image VI formed at the position of the second diaphragm portion 13, the light La is shown as the light passing through the opening 13a, as in the first embodiment shown in FIG. FIG. 16 is an explanatory diagram illustrating the path of the optical La in the third embodiment. In FIG. 16, some optical components (for example, the objective lens 11 shown in FIG. 15) located in the path of light are not shown.

After passing through the aperture 13a, the light La is diffused, converted into parallel light by the relay lens 16 (FIG. 15), and guided to the positions of the two-dimensional image sensors 141, 142, and 143. Parallel light is received by the two-dimensional image sensors 141, 142, and 143. Since the two-dimensional image sensor 141 receives the parallel light through the X filter 121 (FIG. 15), it outputs a light receiving signal indicating X in the XYZ color system. Since the two-dimensional image sensor 142 receives the parallel light through the Y filter 122 (FIG. 15), it outputs a light receiving signal indicating Y in the XYZ color system. Since the two-dimensional image sensor 143 receives the parallel light through the Z filter 123 (FIG. 15), it outputs a light receiving signal indicating Z in the XYZ color system.

For example, the position P1 on the exit pupil 23 corresponds to the position p1 on the two-dimensional image sensors 141, 142, 143, and the position P2 on the exit pupil 23 is the position p2 on the two-dimensional image sensors 141, 142, 143. Corresponding to, the position P3 on the exit pupil 23 corresponds to the position p3 on the two-dimensional image sensors 141, 142, 143. Therefore, the control calculation unit 3 shown in FIG. 2 uses the light-receiving signal (light-receiving signal indicating X, light-receiving signal indicating Y, and light-receiving signal indicating Z) at the position p1 of the two-dimensional image sensors 141, 142, and 143. The calculated luminance and chromaticity indicate the luminance and chromaticity at position P1, and the luminance and chromaticity calculated using the light receiving signal at position p2 indicate the luminance and chromaticity at position P2, and the received light at position p3. The luminance and chromaticity calculated using the signal indicate the luminance and chromaticity at position P3.

The control calculation unit 3 uses the light receiving signal output from the two-dimensional image sensors 141, 142, 143 when the two-dimensional image sensors 141, 142, 143 are receiving light La, on the exit pupil 23. Calculate the brightness and chromaticity of each position. The output unit 7 outputs the result of this calculation. Therefore, according to the optical characteristic measuring device 103 according to the third embodiment, the brightness and the chromaticity of each position on the exit pupil 23 of the HMD 20 can be measured.

With reference to FIG. 15, the light receiving unit 1 of the optical characteristic measuring device 103 includes an observation optical system 18a. The observation optical system 18a is an optical finder (an example of the finder unit), and is a lens 181, a plane mirror 182, an aperture 183, and a lens in order along the optical path of the light reflected by the mirror unit 13b of the second aperture unit 13. 184, a field aperture 185, and an eyepiece lens 186 are arranged. These optical components are ordinary components used in an optical finder, and detailed description thereof will be omitted.

The mirror portion 13b reflects light other than the light passing through the opening 13a among the lights constituting the virtual image VI imaged at the position of the second diaphragm portion 13. Therefore, the measurer can see the remaining part of the virtual image VI other than the part composed of the light passing through the aperture 13a through the eyepiece lens 186.

The measurer sets the position of the objective lens 11 (focusing) in order to form an image of the virtual image VI composed of the light passing through the position of the exit pupil 23 on the second diaphragm portion 13. The optical characteristic measuring device 103 according to the third embodiment is an optical finder that displays a virtual image VI (not the entire virtual image VI, but the rest other than a part of the virtual image VI) using the light reflected by the mirror unit 13b. (Observation optical system 18a) is provided, so that the measurer can easily confirm whether or not the optical characteristic measuring device 103 is in focus on the virtual image VI. The finder unit is not limited to the optical finder and may be an electronic view finder. The fourth embodiment described below is an electronic viewfinder.

When the distance L1 is finite, the measurer operates the optical characteristic measuring device 103 to move the objective lens 11 in the direction of the optical axis Ax to focus. The distance L1 can be known from the amount of movement of the objective lens 11 at this time.

A fourth embodiment will be described. FIG. 17 is a block diagram showing a configuration of a light receiving unit 1 provided in the optical characteristic measuring device 104 according to the fourth embodiment. The optical characteristic measuring device 104 is a colorimeter provided with an electronic viewfinder and capable of measuring brightness and chromaticity. The difference from the optical characteristic measuring device 103 according to the third embodiment shown in FIG. 15 will be described.

The observation optical system 18b provided in the light receiving unit 1 of the optical characteristic measuring device 104 is an electronic view finder, and the lenses 181 and the lenses 181 are sequentially arranged along the optical path of the light reflected by the mirror unit 13b of the second diaphragm unit 13. A plane mirror 182, an aperture 183, a lens 184, a visibility filter 187, and a two-dimensional image sensor 188 are arranged. These optical components are ordinary components used in an electronic viewfinder, and detailed description thereof will be omitted.

The observation optical system 18b further includes a display unit 189. The two-dimensional image sensor 188 outputs a light receiving signal by receiving the light reflected by the mirror portion 13b of the second diaphragm portion 13. This received light signal is a signal indicating a virtual image VI formed at the position of the second diaphragm portion 13. However, as in the third embodiment, the mirror unit 13b reflects light other than the light passing through the opening 13a among the light constituting the virtual image VI imaged at the position of the second diaphragm unit 13. Therefore, it is not a signal indicating the entire virtual image VI, but a signal indicating the remaining portion of the virtual image VI other than a portion composed of light passing through the opening 13a.

The light receiving signal output from the two-dimensional image sensor 188 is sent to the control calculation unit 3 shown in FIG. 2, and the control calculation unit 3 causes the display unit 189 to display an image generated by using the light receiving signal. The image displayed on the display unit 189 is not the entire virtual image VI, but the rest of the virtual image VI other than a part of the virtual image VI.

Of the light La, the light Lb, and the light Lc shown in FIG. 17, the light Lb and the light Lc are reflected by the mirror portion 13b, and the light La passes through the opening 13a. Therefore, the light Lb and the light Lc are received by the two-dimensional image sensor 188. FIG. 18 is an explanatory diagram illustrating the paths of the light Lb and the light Lc. In this figure, some optical components (for example, the objective lens 11 shown in FIG. 17) located in the path of light are not shown. The image display unit 21 and the two-dimensional image sensor 188 have an optical conjugate relationship. For example, the position P6 on the image displayed on the image display unit 21 corresponds to the position p6 on the two-dimensional image sensor 188, and the position P7 on the image displayed on the image display unit 21 corresponds to the position p6 on the two-dimensional image sensor 188. Corresponds to the upper position p7.

The control calculation unit 3 (an example of the second calculation unit) shown in FIG. 2 uses a light receiving signal output from the two-dimensional image sensor 188 to display an image (virtual image displayed by the HMD 20) on the image display unit 21. In the remaining part of VI), the brightness of each position is calculated. For example, the brightness calculated using the light receiving signal output from the position p6 indicates the brightness at the position P6, and the brightness calculated using the light receiving signal output from the position p7 indicates the brightness at the position P7. Therefore, according to the optical characteristic measuring device 104 according to the fourth embodiment, the brightness distribution at each position is measured in the remaining portion of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. be able to.

It is also possible to measure the distribution of the brightness and chromaticity at each position in the remaining portion of the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. In this aspect, the observation optical system 18b shown in FIG. 17 includes an X filter, a Y filter, and a Z filter instead of the luminosity factor 187, and instead of the two-dimensional image sensor 188, the light passing through the X filter is transmitted. It includes a two-dimensional image sensor that receives light, a two-dimensional image sensor that receives light that has passed through a Y filter, and a two-dimensional image sensor that receives light that has passed through a Z filter. The method in which these two-dimensional image sensors receive light may be either a method using the mirror 17a and the mirror 17b described with reference to FIG. 15 or a method using the three-plate prism 17c described below. In order to measure the brightness and chromaticity of the image displayed on the image display unit 21, a method using the rotary filter 40 (FIG. 20) described in the fifth embodiment can also be used. In this case, only one two-dimensional image sensor is required.

With reference to FIG. 17, among the light passing through the position of the exit pupil 23, the light passing through the opening 13a is incident on the three-plate prism 17c. The three-plate prism 17c disperses this light into three optical paths. The first optical path (light passing through the first optical path) passes through the X filter 121 and is received by the two-dimensional image sensor 141. The second optical path (light passing through the second optical path) passes through the Y filter 122 and is received by the two-dimensional image sensor 142. The third optical path (light passing through the third optical path) passes through the Z filter 123 and is received by the two-dimensional image sensor 143.

FIG. 19 is an explanatory diagram illustrating a course of optical La. In this figure, some optical components (for example, the objective lens 11 shown in FIG. 17) located in the path of light are not shown. FIG. 19 is the same as FIG. 16 except that a three-plate prism 17c is shown instead of the mirror 17a and the mirror 17b. Therefore, the optical characteristic measuring device 104 according to the fourth embodiment measures the brightness and chromaticity of each position on the exit pupil 23 of the HMD 20 in the same manner as the optical characteristic measuring device 103 according to the third embodiment shown in FIG. can do.

With reference to FIG. 17, the optical characteristic measuring device 104 according to the fourth embodiment employs a method using a three-plate prism 17c as a method in which the two-dimensional image sensors 141, 142, and 143 receive light. , The method using the mirror 17a and the mirror 17b described with reference to FIG. 15 may be used. As the optical characteristic measuring device 104, it is also possible to adopt the rotary filter 40 (FIG. 20) described in the fifth embodiment. In this case, only one two-dimensional image sensor is required.

A fifth embodiment will be described. In the fourth embodiment shown in FIG. 17, the brightness of each position on the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21 using the two-dimensional image sensor 188 provided in the observation optical system 18b. And measure the chromaticity. On the other hand, in the fifth embodiment, the image (displayed by the HMD 20) displayed on the image display unit 21 is used by using the two-dimensional image sensor used to measure the brightness and chromaticity of each position on the ejection pupil 23. The brightness and chromaticity of each position on the virtual image VI) are measured. FIG. 20 is a block diagram showing a configuration of a light receiving unit 1 provided in the optical characteristic measuring device 105 according to the fifth embodiment in the brightness and chromaticity measurement modes of each position on the exit pupil 23. The difference from the optical characteristic measuring device 101 according to the first embodiment shown in FIG. 3 will be described.

With reference to FIG. 20, the front focal position of the objective lens 11 is at the position of the aperture 10a. This is the same as the optical characteristic measuring device 102 according to the second embodiment shown in FIG.

The light receiving unit 1 of the optical characteristic measuring device 105 does not include the visibility filter 12, but includes a slide rail 19, a relay lens 16, a driving unit 30, and a rotary filter 40.

The second diaphragm portion 13 is slidable along the slide rail 19 (an example of the first switching portion). By sliding the second throttle portion 13 along the slide rail 19, the position of the second throttle portion 13 can be switched between a predetermined position and a position deviated from the predetermined position. As described above, the predetermined position is the position where the virtual image VI formed by the light passing through the position of the exit pupil 23 is formed (the position of the second diaphragm portion 13 in FIG. 20). The position deviated from the predetermined position is a position deviated from the optical path of the light passing through the objective lens 11 (the position of the second diaphragm portion 13 in FIG. 22).

The measurer may manually slide the second diaphragm portion 13 to switch the position of the second diaphragm portion 13, or automatically slide the second diaphragm portion 13 by a motor or the like to perform the second diaphragm. The position of the unit 13 may be switched.

A relay lens 16 and a rotary filter 40 are arranged in this order in the optical path of the light passing through the opening 13a. The relay lens 16 guides the light that has passed through the opening 13a to the rotary filter 40. The relay lens 16 is an example of a relay optical system arranged in an optical path between a diaphragm portion (second diaphragm portion 13) and an image sensor (two-dimensional image sensor 14).

The rotary filter 40 includes an X filter 121, a Y filter 122, a Z filter (not shown), and a rotary plate 401 that holds these filters. As the rotating plate 401 rotates around the shaft 402, the X filter 121, the Y filter 122, and the Z filter (not shown) are sequentially positioned at positions through which the light relayed by the relay lens 16 passes.

The drive unit 30 (an example of the second switching unit) drives the relay lens 16 along the direction of the optical axis Ax. When the relay lens 16 is in the position shown in FIG. 20, the relay lens 16 passes through the opening 13a, converts the diffused light into parallel light, and guides the diffused light to the rotary filter 40. Light La is shown as the light passing through the opening 13a. FIG. 21 is an explanatory diagram for explaining the path of the optical La. In FIG. 21, some optical components (for example, the objective lens 11 shown in FIG. 20) located in the path of light are not shown.

The light La is made into parallel light by the relay lens 16 and guided to the two-dimensional image sensor 14. This parallel light is received by the two-dimensional image sensor 14.

When the two-dimensional image sensor 14 receives the parallel light through the X filter 121 (FIG. 20), the two-dimensional image sensor 14 outputs a light receiving signal indicating X in the XYZ color system. When the two-dimensional image sensor 14 receives the parallel light through the Y filter 122 (FIG. 20), the two-dimensional image sensor 14 outputs a light receiving signal indicating Y of the XYZ color system. When the two-dimensional image sensor 14 receives the parallel light through a Z filter (not shown), the two-dimensional image sensor 14 outputs a light receiving signal indicating Z in the XYZ color system.

For example, the position P1 on the exit pupil 23 corresponds to the position p1 on the two-dimensional image sensor 14, the position P2 on the exit pupil 23 corresponds to the position p2 on the two-dimensional image sensor 14, and is on the exit pupil 23. The position P3 corresponds to the position p3 on the two-dimensional image sensor 14. Therefore, the luminance and color calculated by the control calculation unit 3 shown in FIG. 2 using the light-receiving signal (light-receiving signal indicating X, light-receiving signal indicating Y, and light-receiving signal indicating Z) at the position p1 of the two-dimensional image sensor. Degree indicates the brightness and chromaticity of position P1, and the brightness and chromaticity calculated using the received signal at position p2 indicates the brightness and chromaticity of position P2, and is calculated using the received signal at position p3. The brightness and chromaticity obtained indicate the brightness and chromaticity at position P3. Therefore, according to the optical characteristic measuring device 105 according to the fifth embodiment, the brightness and the chromaticity of each position on the exit pupil 23 of the HMD 20 can be measured.

FIG. 22 is provided with the optical characteristic measuring device 105 according to the fifth embodiment in a mode for measuring the brightness and chromaticity of each position on the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. It is a block diagram which shows the structure of the light receiving part 1. The difference from FIG. 20 is that the second diaphragm portion 13 is located outside the optical path of the light passing through the position of the exit pupil 23, and the relay lens 16 is moved to the rotary filter 40 side.

The virtual image VI composed of the light passing through the position of the exit pupil 23 is imaged by the objective lens 11 at a predetermined position (the position of the second diaphragm portion 13 shown in FIG. 20), and constitutes this image formation. The light diffuses and enters the relay lens 16, and the relay lens 16 forms a virtual image VI on the two-dimensional image sensor 14. FIG. 23 is an explanatory diagram illustrating a path of light in a mode for measuring the brightness and chromaticity of each position on the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. In FIG. 23, some optical components (for example, the objective lens 11 shown in FIG. 22) located in the path of light are not shown.

When the two-dimensional image sensor 14 receives light through the X filter 121 (FIG. 22), the two-dimensional image sensor 14 outputs a light receiving signal indicating X in the XYZ color system. When the two-dimensional image sensor 14 receives light through the Y filter 122 (FIG. 22), the two-dimensional image sensor 14 outputs a light receiving signal indicating Y in the XYZ color system. When the two-dimensional image sensor 14 receives light through a Z filter (not shown), the two-dimensional image sensor 14 outputs a light receiving signal indicating Z in the XYZ color system.

For example, the position P6 on the image displayed on the image display unit 21 corresponds to the position p6 on the two-dimensional image sensor 14, and the position P7 on the image displayed on the image display unit 21 corresponds to the two-dimensional image sensor 14. The position P8 on the image corresponding to the upper position p7 and displayed on the image display unit 21 corresponds to the position p8 on the two-dimensional image sensor 14. Therefore, the brightness and color calculated by the control calculation unit 3 shown in FIG. 2 using the light-receiving signal (light-receiving signal indicating X, light-receiving signal indicating Y, light-receiving signal indicating Z) at the position p6 of the two-dimensional image sensor. The degree indicates the brightness and chromaticity of the image displayed on the image display unit 21 at the position P6, and the brightness and chromaticity calculated using the received signal at the position p7 are the brightness and chromaticity of the image displayed on the image display unit 21. The luminance and chromaticity of the position P7 are shown, and the luminance and chromaticity calculated by using the received signal at the position p8 indicate the luminance and chromaticity of the image displayed on the image display unit 21. Therefore, according to the optical characteristic measuring device 105, the brightness and chromaticity of each position on the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21 can be measured.

As described above, with reference to FIGS. 20 and 22, the drive unit 30 (an example of the second switching unit) switches the position of the relay lens 16 between the first position and the second position. The first position is the position of the relay lens 16 shown in FIG. 20, and when the position of the second diaphragm portion 13 is the above-mentioned predetermined position, it passes through the opening 13a and constitutes a part of the widened virtual image VI. This is the position where the relay lens 16 can relay the light (light La) to the two-dimensional image sensor 14. The second position is the position of the relay lens 16 shown in FIG. 22, and when the position of the second diaphragm portion 13 is out of the above position, the virtual image VI formed at the predetermined position is displayed on the relay lens. It is a position where an image can be formed on the two-dimensional image sensor 14 by 16.

The control calculation unit 3 (FIG. 2) is an example of the calculation unit, in which the second diaphragm unit 13 is in the predetermined position and the relay lens 16 is in the first position (state shown in FIG. 20). ), The optical characteristics (brightness, chromaticity, etc.) of the ejection pupil 23 are calculated using the signal output from the two-dimensional image sensor 14, and the second diaphragm portion 13 is in the position deviated from the above. With the relay lens 16 in the second position (the state shown in FIG. 22), the optical characteristics (brightness, chromaticity, etc.) of the virtual image VI are calculated using the signal output from the two-dimensional image sensor 14.

According to the optical characteristic measuring device 105 according to the fifth embodiment, the two-dimensional used for measuring the brightness and chromaticity of each position on the image (virtual image VI displayed by the HMD 20) displayed on the image display unit 21. The image sensor 14 and the two-dimensional image sensor 14 used for measuring the brightness and chromaticity of each position on the ejection pupil 23 can be shared.

(Summary of embodiments)
The optical characteristic measuring device according to the present embodiment is composed of light that has passed through the position of the ejection pupil in a state where a virtual image that can be seen from the position of the ejection pupil of the virtual image display device is displayed by the virtual image display device. An imaging optical system for forming an image of the virtual image at a predetermined position, and an aperture for passing light arranged at the predetermined position and forming a part of the virtual image formed at the predetermined position. The optical characteristics of each position on the ejection pupil are calculated using the unit, the image sensor that receives the light that has passed through the aperture and spreads to form the part, and the signal output from the image sensor. It includes a calculation unit.

The imaging optical system forms a virtual image composed of light that has passed through the position of the exit pupil at the position of the diaphragm portion (predetermined position). The light forming a part of the virtual image formed at the position of the diaphragm portion is parallel light having a predetermined spread at the position of the exit pupil. This parallel light is the light distributed throughout the exit pupil when viewed from the front of the exit pupil. The light constituting the above part is the spread light (divergent light or parallel light) at the position of the image sensor. The present inventor can obtain the optical characteristics of each position on the exit pupil of the virtual image display device in a state where the virtual image display device is displaying a virtual image by using the light receiving signal output from the image sensor that receives the light. I found that it was possible. For example, in the case of brightness, the brightness of each position on the exit pupil of the virtual image display device (not the brightness of each position on the virtual image) can be obtained. Therefore, according to the optical characteristic measuring device according to the present embodiment, it is possible to measure the optical characteristic of each position on the exit pupil of the virtual image display device.

In the above configuration, a moving portion for moving the diaphragm portion is further provided at a position where light constituting another portion of the virtual image different from the partial image formed at the predetermined position can pass through the opening.

According to this configuration, the diaphragm portion can be moved to a position where the light constituting the other part of the virtual image can pass through the opening. Therefore, with respect to the light that constitutes a part of the virtual image (for example, the central portion of the virtual image), the optical characteristics of each position on the exit pupil are measured, and other parts of the virtual image (for example, the peripheral portion of the virtual image) are formed. With respect to light, the optical characteristics of each position on the exit pupil can be measured.

In the above configuration, the diaphragm portion includes a mirror portion located around the aperture and reflecting light constituting the remaining portion other than the portion of the virtual image formed at the predetermined position, and the optical The characteristic measuring device further includes a finder unit that displays the remaining portion of the virtual image by using the light reflected by the mirror unit.

Since this configuration includes the finder unit, the measurer can easily confirm whether or not the optical characteristic measuring device is in focus on the virtual image. The finder unit may be either an optical finder or an electronic viewfinder.

In the above configuration, the diaphragm portion includes a mirror portion located around the aperture and reflecting light constituting the remaining portion other than the portion of the virtual image formed at the predetermined position, and the optical The characteristic measuring device further uses a two-dimensional image sensor that receives the light reflected by the mirror portion and a light receiving signal output from the two-dimensional image sensor at each position in the remaining portion of the virtual image. It is provided with a second calculation unit for calculating the optical characteristics of the above.

According to this configuration, in addition to the optical characteristics of each position on the exit pupil, the optical characteristics of each position on the virtual image displayed by the virtual image display device (not all the virtual images but each position of the remaining part) are measured. be able to.

In the above configuration, the relay optical system arranged in the optical path between the aperture portion and the image sensor, a position deviated from the optical path of the light passing through the imaging optical system, and the predetermined position are located. When the position of the throttle portion is the predetermined position, the first switching portion for switching the position of the throttle portion and the light that passes through the opening and spreads to form the part of the virtual image are transmitted to the relay optical system. When the first position that can be relayed to the image sensor and the position of the throttle portion are the positions that are out of the position, the virtual image formed at the predetermined position is imaged by the relay optical system. A second position at which an image can be formed on the sensor and a second switching unit for switching the position of the relay optical system are further provided, and the calculation unit has the aperture unit at the predetermined position. In addition, with the relay optical system in the first position, the optical characteristics of each position on the ejection pupil are calculated using the signal output from the image sensor, and the throttle portion is disengaged. The optical characteristics of each position on the virtual image are calculated using the signal output from the image sensor in a state where the relay optical system is in the second position.

According to this configuration, an image sensor used to measure the optical characteristics of each position on the exit pupil of the virtual image display device and an image sensor used to measure the optical characteristics of each position on the virtual image displayed by the virtual image display device are used. It can be shared with the image sensor.

This application is based on Japanese Patent Application No. 2016-083494 filed on April 19, 2016, the contents of which are included in the present application.

In order to express the present invention, the present invention has been appropriately and sufficiently described through the embodiments with reference to the drawings above, but those skilled in the art can easily change and / or improve the above embodiments. It should be recognized that it can be done. Therefore, unless the modified or improved form implemented by a person skilled in the art is at a level that deviates from the scope of rights of the claims stated in the claims, the modified form or the improved form is the scope of rights of the claims. It is interpreted as being included in.

According to the present invention, it is possible to provide an optical characteristic measuring device.

Claims (5)

A virtual image that can be seen from the position of the exit pupil of the virtual image display device is displayed at a predetermined position by forming the virtual image composed of light that has passed through the position of the exit pupil while being displayed by the virtual image display device. Imaging optical system to make
A diaphragm portion arranged at the predetermined position and having an opening for passing light constituting a part of the virtual image formed at the predetermined position.
An image sensor that receives light that passes through the opening and spreads to form the part thereof,
An optical characteristic measuring device including a calculation unit that calculates an optical characteristic of each position on the exit pupil using a signal output from the image sensor. The first aspect of claim 1, further comprising a moving portion for moving the diaphragm portion at a position where light constituting another portion of the virtual image different from the partial image formed at the predetermined position can pass through the opening. Optical characteristic measuring device. The diaphragm portion includes a mirror portion located around the opening and reflecting light constituting the remaining portion other than the portion of the virtual image formed at the predetermined position.
The optical characteristic measuring apparatus according to claim 1 or 2, wherein the optical characteristic measuring apparatus further includes a finder portion that displays the remaining portion of the virtual image by using the light reflected by the mirror portion. The diaphragm portion includes a mirror portion located around the opening and reflecting light constituting the remaining portion other than the portion of the virtual image formed at the predetermined position.
The optical characteristic measuring device further
A two-dimensional image sensor that receives the light reflected by the mirror unit and
The optics according to claim 1 or 2, further comprising a second calculation unit that calculates the optical characteristics of each position in the remaining portion of the virtual image using the received light signal output from the two-dimensional image sensor. Characteristic measuring device. A relay optical system arranged in an optical path between the aperture and the image sensor,
A first switching unit that switches the position of the diaphragm portion between a position deviated from the optical path of light passing through the imaging optical system and the predetermined position.
When the position of the diaphragm portion is the predetermined position, the relay optical system can relay the light that has passed through the opening and spreads to form the part of the virtual image to the image sensor. When the position and the position of the diaphragm portion are out of the position, the virtual image formed at the predetermined position can be imaged on the image sensor by the relay optical system. In addition, a second switching unit for switching the position of the relay optical system is further provided.
The calculation unit uses a signal output from the image sensor in a state where the diaphragm unit is in the predetermined position and the relay optical system is in the first position, and is on the ejection pupil. The optical characteristics of each position are calculated, and the signal output from the image sensor is used in the state where the diaphragm portion is in the detached position and the relay optical system is in the second position. The optical characteristic measuring apparatus according to any one of claims 1 to 3, which calculates the optical characteristics of each position on a virtual image.

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