JP7680919B2 - Viewing angle measuring device - Google Patents

Description

Patent Law Article 30, Paragraph 2 applied On June 8, 2021, Entrust Co., Ltd. published the following in the publication: Entrust Co., Ltd. "CORPORATE PROFILE" company introduction pamphlet, page 7

The present invention relates to a viewing angle measuring device. More specifically, it relates to a viewing angle measuring device used when measuring with an optical measuring instrument while changing the angle with respect to a display screen.

In recent years, in order to develop flat-panel displays that are easy for multiple people to view, there has been a demand for devices that can be used to measure with optical measuring instruments by changing the angle relative to the display screen.

In other words, with flat displays such as liquid crystal displays, organic EL displays, and plasma displays, people looking at the screen from an angle may find it harder to see than people looking at it from the front. In addition, because the eye heights of adults and children are different, it is important to see how the screen looks from above, below, left, right, and at an angle. For this reason, LCD displays and other displays are improved by using viewing angle improvement films, etc. To evaluate these, there is a demand for a device that can be used when measuring with an optical measuring instrument by changing the angle relative to the display screen, and that can measure the viewing angle, which is the range of angles at which the screen display can be seen correctly.

Such optical measuring instruments include luminance meters and color meters, but the optical measuring instrument must be kept at a specified measurement distance from the measurement point on the display screen. There is a demand for a device that can hold the optical measuring instrument at a specified angle to this measurement point and rotate it at a specified angle relative to the measurement point around an axis perpendicular to the display screen that passes through the measurement point, or rotate it relative to the measurement point along a plane that includes this perpendicular axis and the optical axis of the optical measuring instrument.

One such device is the wide-range, wide-angle luminance measuring device disclosed in Patent Document 1. This device improves the accuracy of luminance measurement by measuring the luminance from all directions of the measurement point on the screen being measured when measuring the luminance of the screen.

That is, an arc-shaped guide member with its center position at any position on the screen to be measured is moved in the XY axis direction relative to the screen to be measured to position the measurement point, a luminance meter that can move freely on the guide member and has its focus set at the center position is set to be tilted at a predetermined angle relative to the measurement point, and the guide member is rotated to measure the luminance of the measurement point over 360° using the tilted luminance meter.

This wide-range, wide-angle luminance measurement device allows measurements over 360° using a luminance meter with an inclination angle relative to the measurement point on the screen being measured, making it possible to accurately measure the luminance generated by the screen from all directions and all angle positions, and also making it possible to automate the process.

Another such device is the characteristics measuring device disclosed in Patent Document 2. This device is capable of easily placing the display surface on a reference plane and measuring characteristics at a specified or arbitrary position without being affected by the size, shape, or mounted parts of a flat-panel display.

This characteristic measuring device is used to measure the viewing angle of a flat display, and it sets a vertical oscillation axis passing through the center of the reference surface of the display, sets a horizontal oscillation axis perpendicular to the vertical oscillation axis at the center of the reference surface, holds the display near the reference surface with a holding means for setting the reference plane, measures the distances between any three points on the display surface of the display with a distance measuring device located at an arbitrary distance from the display surface of the display, calculates the tilt angle and the distance between the display and the reference surface from the distances of each point, moves the holding means to reduce the distance to the reference surface, swings the display around the vertical oscillation axis and the horizontal oscillation axis around the intersection of the vertical oscillation axis and the horizontal oscillation axis to make it closer to parallel to the reference surface, repeats the process of re-measuring the distances of the three points and re-swinging the display around the vertical oscillation axis and the horizontal oscillation axis to place the display on the reference surface, replaces the distance measuring device with a viewing angle observation means, and swings the display around the vertical oscillation axis and the horizontal oscillation axis to adjust and specify the viewing angle.

In other words, this characteristic measuring device adjusts and specifies the viewing angle by swinging the flat display relative to the viewing angle observation means using the vertical axis direction swinging means and the horizontal axis direction swinging means. Here, in the vertical axis direction swinging means, a vertical direction swinging shaft is attached to the tip of an arm that is part of the horizontal axis direction swinging means, and a support plate is supported at the upper end of this vertical direction swinging shaft so that it can rotate freely and hold any position, and a display support shaft is fixed to this support plate, and a clamp, which is a holding means for holding the flat display, is attached to this display support shaft. In addition, the vertical axis swinging means is attached to a base, and the distance measuring device or viewing angle observation means is supported so that it can move up and down, left and right, and back and forth relative to the base.

Another such device is the vertical rotation type viewing angle variable device disclosed in Non-Patent Document 1. Like the characteristic measuring device disclosed in Patent Document 2, this device measures by swiveling and rocking a flat panel relative to a measuring camera, and is also configured to be able to rotate the flat panel.

In other words, with this device, you can set the desired measurement point on the panel surface at any point, and then set the distance from that point, as well as the elevation and depression angles, and the device will automatically move to the appropriate position, making it possible to perform display performance evaluation tests on flat panels.

JP 2000-292256 A JP 2007-271350 A

Vertical rotation type viewing angle changer, [searched on July 30, 2021], Internet <http://www.osk.ecweb.jp/sub2.html>

However, with the technology described in Patent Document 1, the measuring device must be installed relative to the screen to be measured in a position directly opposite it at the measurement distance, but there is the inconvenience that it is difficult to install accurately without any guide. In addition, the flat panel display and the measuring device are placed at a distance from each other, and in order to increase the measurement accuracy, the measuring device must be constructed with a robust structure, including an arc guide section that holds the luminance meter and a rotation mechanism, and there is the inconvenience that it is not easy to move the device.

In addition, in the technology described in Patent Document 2, an arm is used for the horizontal axis swing, so the distance from the viewing angle observation means and the vertical position change when the viewing angle is swung in the horizontal axis direction. This causes the focal position of the viewing angle observation means to shift, and each time this happens, there is the inconvenience of having to move the viewing angle observation means back and forth and up and down relative to the flat display to adjust it to a specified position. In addition, it is necessary to hold the flat display and the viewing angle observation means with high precision, and the base of the device must have a sturdy structure, which makes it difficult to carry around. In addition, although it is possible to swing the flat display in the vertical axis direction and the horizontal axis direction, there is the inconvenience of it being difficult to perform measurements by rotating the flat display relative to the other display.

In addition, with the technology described in Non-Patent Document 1, although it is possible to perform measurements while rotating the flat panel screen, it is necessary to hold both the flat panel and the characteristic measuring device with high precision, which means that the entire device has an extremely robust and rigid structure and must be installed in a large location, which is an inconvenience. Also, with the appearance of increasingly larger screens in recent years, there has been the inconvenience that as the screen size becomes enormous, the entire device must also become larger to accommodate it.

The object of the present invention is to provide a visual field measuring device that has a compact structure and is capable of performing accurate measurements.

To solve the above problems, the present invention adopts the following configuration.

The present invention relates to a viewing angle measuring device that is configured to hold an optical measuring instrument at a predetermined angle relative to a measurement point on a flat display at a predetermined distance, which is the measurement distance of the optical measuring instrument, perform a rolling rotation in which the optical measuring instrument is rotated relative to the flat display at a predetermined angle around an axis perpendicular to the flat display that passes through the measurement point, and perform a planar rotation in which the optical measuring instrument is rotated relative to the flat display at a predetermined distance around the measurement point along a plane that includes the perpendicular axis and the optical axis of the optical measuring instrument.
The viewing angle measuring device has a shading section for blocking unnecessary light from the flat display, and a rotating holding section for holding the optical measuring instrument so as to allow rolling rotation and surface rotation, the shading section having a shading plate section having a shading hole of a predetermined size centered on the measurement point, and a spacer section for separating the flat display and the shading plate section in parallel by a predetermined distance, the rotating holding section having a ring guide section which is approximately ring-shaped and guides the back side of the shading section so as to be rotatable parallel to the flat display around the measurement point, and a surface rotation guide section which is fixed to the ring guide section and holds the luminance meter so as to be surface rotatable around the measurement point, and is configured to abut the spacer section against the flat display and rotate the ring guide section to perform rolling rotation of the optical measuring instrument, and to perform measurement by surface rotation of the optical measuring instrument using the surface rotation guide section.

The surface rotation guide portion also has a surface rotation locking portion, and is configured to be locked at every first predetermined angle when the optical measuring device is surface rotated.

The visual field measuring device also has a rolling rotation locking portion, and is configured to be locked at every second predetermined angle when the optical measuring device is rolled.

The visual field angle measuring device has a vertical holding part for holding the visual field angle measuring device vertically, the vertical holding part having a front plate that is fixed in close contact with the back surface of the light blocking part and has a front plate hole that is larger than or equal to the light blocking hole, a rear plate that rotatably holds the rear rotation support part, a lower connecting part that connects the lower parts of the front plate and the rear plate, and an upper connecting part that connects the upper parts of the front plate and the rear plate, the rotation holding part has a rear rotation support part at a position facing the measurement point at the rear of the surface rotation guide part, and the rotation holding part is configured such that the ring guide part slides on the back surface side of the light blocking part while being rotatably guided via the front plate, and the rear rotation support part is rotatably held by the rear plate, so that the vertical holding part holds the visual field angle measuring device vertically and rotates in a rolling manner.

The rear of the surface rotation guide has a rear rotating plate that rotates around the rear rotation support, and the rear plate is provided with a rolling rotation locking portion, and is configured to lock the rear rotating plate at every second predetermined angle when the optical measuring device is rolled.

The rear surface of the rear rotating plate has a rolling rotation angle display unit that displays the rolling rotation angle, which is the angle of the rolling rotation from the reference angle, and the rear plate is provided with a rolling rotation angle display window, and a part of the rolling rotation angle display unit is displayed through the rolling rotation angle display window, so that the rolling rotation angle can be confirmed from the rear side of the visual field angle measuring device.

The flat display is placed flat facing upwards, and the viewing angle measuring device is placed horizontally on the flat display with the spacer portion facing downwards, to measure the luminance.

The present invention has the above-mentioned characteristics, which makes it possible to achieve the following:

A visual field angle measuring device configured to hold an optical measuring device at a predetermined angle relative to a measurement point on a flat display at a predetermined distance, which is the measurement distance of the optical measuring device, perform a rolling rotation in which the optical measuring device is rotated at a predetermined angle relative to the flat display around an axis perpendicular to the flat display that passes through the measurement point, and perform a surface rotation in which the optical measuring device is rotated at a predetermined distance relative to the flat display around the measurement point along a plane that includes the perpendicular axis and the optical axis of the optical measuring device, the visual field angle measuring device has a light shielding section for blocking unnecessary light from the flat display, and a rotation holding section for holding the optical measuring device so that the rolling rotation and surface rotation are possible, the light shielding section is configured to hold the optical measuring device at a predetermined angle relative to the measurement point on a flat display, The optical measuring device has a light shielding plate portion having a light shielding hole of a predetermined size centered on the light shielding plate portion, and a spacer portion for separating the flat display and the light shielding plate portion by a predetermined distance in parallel, and the rotating holding portion has a ring guide portion that is approximately ring-shaped and guides the back side of the light shielding portion to be rotatable parallel to the flat display around the measurement point, and a surface rotation guide portion that is fixed to the ring guide portion and holds the luminance meter so that it can be rotated around the measurement point, and is configured such that the optical measuring device is rotated in a rolling manner by abutting the spacer portion against the flat display and rotating the ring guide portion, and the optical measuring device is rotated by the surface rotation guide portion to perform measurement, thereby making it possible to obtain a viewing angle measuring device that has a compact structure and is capable of performing accurate measurements.

The surface rotation guide portion also has a surface rotation locking portion, and is configured to be locked at every first predetermined angle when the optical measuring instrument is surface rotated, so that it is possible to easily lock it at every first predetermined angle when rotating the surface and perform measurements.

The visual field angle measuring device also has a rolling rotation locking section and is configured to lock at every second predetermined angle when the optical measuring device is rolled, so that it is possible to easily lock at every second predetermined angle when rolling and perform measurements.

The visual field angle measuring device has a vertical holding part for holding the visual field angle measuring device vertically, and the vertical holding part has a front plate that is fixed in close contact with the back surface of the light blocking part and has a front plate hole that is larger than or equal to the light blocking hole, a rear plate that rotatably holds the rear rotation support part, a lower connecting part that connects the lower part of the front plate and the rear plate, and an upper connecting part that connects the upper part of the front plate and the rear plate, and the rotation holding part has a rear rotation support part at a position facing the measurement point at the rear of the surface rotation guide part, and the rotation holding part is configured so that the ring guide part slides on the back surface side of the light blocking part while being rotatably guided via the front plate, and the rear rotation support part is rotatably held by the rear plate, so that the vertical holding part holds the visual field angle measuring device vertically and rotates in a rolling manner, so that the flat display is placed vertically and the visual field angle measuring device is brought into contact with the flat display, making it possible to perform accurate measurements.

The rear of the surface rotation guide has a rear rotating plate that rotates around the rear rotation support, and the rear plate is provided with a rolling rotation locking portion. The rolling rotation locking portion locks the rear rotating plate, so that when the optical measuring device is rolled, it is locked at every second predetermined angle, making it easy to perform measurements by rolling.

The rear surface of the rear rotating plate has a rolling rotation angle display that displays the rolling rotation angle, which is the angle of the rolling rotation from the reference angle, and the rear plate is provided with a rolling rotation angle display window, which displays part of the rolling rotation angle display, allowing the rolling rotation angle to be confirmed from the rear side of the visual field angle measuring device, making it possible to perform measurements by rolling while checking the rolling rotation angle.

The flat display is placed flat with the display facing upwards, and the viewing angle measuring device is placed horizontally on the flat display with the spacer portion facing downwards to measure the luminance, so that a viewing angle measuring device with high accuracy can be obtained with a simple configuration.

1 is a perspective view showing an example of use of a viewing angle measurement device according to a first embodiment of the present invention; 1A and 1B show the configuration of a viewing angle measurement device according to a first embodiment of the present invention, in which FIG. 1A is a perspective view seen from the rear direction, and FIG. 1 is an exploded perspective view showing the configuration of a viewing angle measurement device according to a first embodiment of the present invention, as viewed from behind. FIG. 1A and 1B show the configuration of a main part of a viewing angle measurement device according to a first embodiment of the present invention, in which FIG. 1A is a perspective view seen from above, and FIG. 1A and 1B show the configuration of a main part of a viewing angle measurement device according to a first embodiment of the present invention, in which FIG. 1A is an exploded perspective view seen from the rear, and FIG. 1A and 1B show the configuration of a viewing angle measurement device according to a first embodiment of the present invention, where FIG. 1A is a reference perspective view and FIG. 1A to 1E show the configuration of a viewing angle measurement device according to a first embodiment of the present invention, with FIG. 1C being a rear view, FIG. 1A to 1H show the configuration of a viewing angle measurement device according to a first embodiment of the present invention, where (F) is a left side view, (G) is a right side view, and (H) is a reference perspective view. FIG. 11 is a perspective view seen from above, showing an example of use of a viewing angle measurement device according to a second embodiment of the present invention. FIG. 11 is a perspective view showing the configuration of a viewing angle measurement device according to a second embodiment of the present invention, as viewed from above. FIG. 11 is a perspective view seen from above showing the configuration of a main part of a viewing angle measurement device according to a second embodiment of the present invention. FIG. 11 is a perspective view seen from above showing the configuration of a main part of a viewing angle measurement device according to a second embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
In the following explanation, the front-to-back, up-down, and left-to-right directions are indicated when the viewing angle measuring device is installed on a flat display and seen from the perspective of the person performing the measurement, with the direction in which the flat display is located being referred to as the front direction (front direction) and the opposite direction being referred to as the rear direction (rear direction).
However, the directions such as front-back, up-down, left-right, etc. shown below are shown for the convenience of explanation, and the application of the present technology is not limited to these directions.

The viewing angle measuring device of the present invention is configured to hold the optical measuring instrument at a predetermined angle relative to a measurement point on a flat display at a predetermined distance, which is the measurement distance of the optical measuring instrument, perform a rolling rotation in which the optical measuring instrument is rotated at a predetermined angle relative to the flat display around an axis perpendicular to the flat display that passes through the measurement point, and perform a planar rotation in which the optical measuring instrument is rotated at a predetermined distance relative to the flat display around the measurement point along a plane that includes this perpendicular axis and the optical axis of the optical measuring instrument, and the details of this are described below.

(First embodiment)
A viewing angle measuring device 1 according to a first embodiment of the present invention will be described with reference to FIGS.
Fig. 1 is a perspective view showing an example of use of the visual field angle measurement device 1, Figs. 2(A) and (B) are perspective views showing the configuration of the visual field angle measurement device 1, and Fig. 3 is an exploded perspective view. Figs. 4(A) and (B) are perspective views showing the configuration of a portion of the visual field angle measurement device 1, Fig. 5(A) is an exploded perspective view showing the configuration of another portion of the visual field angle measurement device 1, and Fig. 5(B) is a perspective view showing the configuration of that portion. Figs. 6 to 8(A) to (H) are diagrams expressing the external shape of the visual field angle measurement device 1 in a design sense.
In this embodiment, a case will be described in which luminance is measured using a luminance meter L as an optical measuring instrument.

Figure 1 is a diagram showing a situation in which a person is using a viewing angle measuring device 1 fixed on a stand 200 to measure the luminance at a measurement point P on a flat display 100 with a luminance meter L. As shown in Figure 1, the viewing angle measuring device 1 is abutted against the screen of the flat display 100 at a predetermined position on the screen of the flat display 100, which is placed vertically on the floor, and is positioned and installed as one unit.

As shown in FIG. 1, the stand 200 has a support leg 210, a vertical expansion section 220, an upper plate section 230, and fixing bracket sections 240, 240, 240, 240. The stand 200 is stably placed on the floor by the support leg 210. The vertical expansion section 220 fixed to the upper part of the support leg 210 is configured to be freely expandable and contractable up and down by a pantograph mechanism such as a jack, and holds the upper plate section 230 parallel to the floor. The viewing angle measuring device 1 fixed to the upper plate section 230 by the fixing bracket sections 240, 240, 240, 240 is held at a predetermined position on the screen of the flat display 100 by the stand 200.

The configuration of the viewing angle measuring device 1 will now be described with reference to FIGS.
Fig. 2(A) is a perspective view of the viewing angle measurement device 1 seen from the rear, (B) is a perspective view of the viewing angle measurement device 1 seen from the front, and Fig. 3 is an exploded perspective view of the viewing angle measurement device 1 seen from the rear. Note that Figs. 1, 2(A) and 2(B) show views in which the luminance meter L is shifted to the right of the viewing angle measurement device 1, but Fig. 3 shows a view in which the luminance meter L is shifted to the left.

As shown in Figures 2(A), (B) and 3, the viewing angle measurement device 1 has a light shielding section 10 (light shielding section) for blocking unnecessary light from the flat display 100, a rotating holder 20 (rotating holder) for rotatably holding the luminance meter L, and a vertical holder 30 (vertical holder) for holding the viewing angle measurement device 1 vertically. The luminance meter L is held by the rotating holder 20 via the luminance meter holder 40.

2(A), (B) and 3, the light shielding unit 10 has a light shielding plate 11 (light shielding plate) made of a resin plate and spacer portions 12, 12, 12, 12 (spacer portions) made of a flexible material such as rubber or elastomer. The light shielding plate 11 is a perforated disk shape having a light shielding hole 13 (light shielding hole) of a predetermined size centered on an axis (hereinafter referred to as the measurement point P axis) that passes through the measurement point P and is perpendicular to the screen of the flat display 100, and has a rectangular bulging shape at the bottom. The light shielding hole 13 is configured to be of a size such that the light shielding plate 11 does not interfere with the measurement when the luminance meter L is tilted and measured. The spacer portions 12, 12, 12, 12 are provided near the upper, lower, left and right edges of the front part of the light shielding plate 11 and are configured to abut against the screen of the flat display 100 to keep the light shielding plate 11 parallel to the screen at a predetermined distance.

As shown in Figs. 2(A), (B) and 3, the vertical placement holding section 30 has a front frame section 50, a rear frame section 60, an upper connecting section 31 (upper connecting section) and a lower connecting section 32 (lower connecting section), and is made of a metal plate or the like. The pivoting holding section 20 is held by the front frame section 50 and the rear frame section 60 so as to be pivotable from the front and rear. The upper and lower parts of the front frame section 50 and the rear frame section 60 are connected and fixed by the upper connecting section 31 and the lower connecting section 32, respectively. The lower connecting section 32 is configured so as to be able to be placed on a flat surface such as the upper plate section 230, and the front frame section 50 and the rear frame section 60 are configured so as to be perpendicular to the lower connecting section 32.

As shown in Figures 2(A), (B) and 3, the front frame section 50 has a flat front plate section 51 (front plate) and pivot fixing sections 52, 52, 52 for pivotally fixing the pivot holding section 20 to the back surface of the front plate section 51 as described below. The front plate section 51 has an outer shape that is approximately the same as the outer shape of the light shielding plate section 11, and is approximately ring-shaped with a large front plate hole section 53 centered on the axis of the measurement point P on the inner side of a narrow, approximately predetermined width from the outer diameter, and its lower part is formed into a rectangular bulging shape. The edge of the front plate hole section 53 on the back surface of the front plate section 51 is formed thinly in a step shape of a predetermined width around the entire circumference, and forms a front plate guide section 54 that guides the pivot holding section 20 as described below.

As shown in Figures 2(A), (B) and 3, the rear frame section 60 has a flat, approximately trapezoidal rear plate section 61 (rear plate) and a rear plate sliding plate section 62 (rolling rotation locking section) that slides on the front upper surface of the rear plate section 61. A rear holding hole section 63 for rotatably holding the rotating holding section 20 is provided at the intersection of the rear plate section 61 and the measurement point P axis. Details of the movement of the rear plate sliding plate section 62 will be explained separately below.

As shown in Figures 2(A), (B) and 3, the rotation holding part 20 has a flat ring-shaped rolling rotation guide part 21 (ring guide part), a semicircular surface rotation guide part 22 (surface rotation guide part) with a rectangular bulge at the rear, and a flat disc-shaped rolling rotation display part 23 (rear rotating plate), and is made of a metal plate or the like.

As shown in Figures 2(A), (B) and 3, the rolling rotation guide section 21 is completely housed in the step of the front plate guide section 54 on the back surface of the front plate section 51, and the rotating fixed sections 52, 52, 52 are fixed to the front plate section 51, so that the rolling rotation guide section 21 is configured to slide within the front plate guide section 54. In addition, the rotating fixed sections 52, 52, 52 each have rollers (not shown) and hold the outer diameter section of the rolling rotation guide section 21 from three sides. In other words, the rolling rotation guide section 21 is configured to be rotatable around the measurement point P axis while sliding along the back surface of the front plate section 51.

As shown in Figures 2(A), (B) and 3, the surface rotation guide 22 is fixed vertically to the rolling rotation guide 21 at a slightly off-center position so that the optical axis of the luminance meter L passes through the measurement point P. The rolling rotation display 23 is fixed vertically to the rear of the surface rotation guide 22 so that its center passes through the axis of the measurement point P. A rear holding shaft 24 (rear rotation support) is fixed to the center of the back of the rolling rotation display 23, protruding toward the rear, and is configured to be rotatably held by the rear holding hole 63 of the rear plate 61.

In other words, the rotating holder 20 is held rotatably with the rolling rotation guide 21 positioned up, down, and left, right by the front frame 50, and the rear holder shaft 24 positioned by the rear frame 60. Here, the front-to-back positioning of the rotating holder 20 is performed by the front frame 50 sliding on the back of the front plate 51, and the rear holder shaft 24 is provided with a small clearance in the front-to-back direction, so it is not involved in the front-to-back positioning.

Now, using Figures 4(A) and (B), we will explain how the luminance meter L is held so as to be able to rotate around the surface rotation guide unit 22 via the luminance meter holder 40. Figure 4(A) is a perspective view of the surface rotation guide unit 22 and related parts as seen from above, and Figure 4(B) is a perspective view as seen from below. Note that Figures 4(A) and (B) show the luminance meter L shifted to the right of the viewing angle measuring device 1.

As shown in Figures 4 (A) and (B), the surface rotation guide section 22 has a surface rotation guide plate section 25, a surface rotation ratchet plate section 26, and surface rotation guide plate handle sections 27, 27. The luminance meter holding section 40 has a luminance meter fixing section 41, a luminance meter fixing roller section 42, 42, a luminance meter holding slide plate section 43 (surface rotation locking section), and a luminance meter holding section handle section 44, 44. The outer peripheral edge section of the surface rotation ratchet plate section 26 has projections and recesses formed at 5 degree intervals, which is the first predetermined angle.

As shown in Figures 4(A) and (B), the surface rotation guide plate 25 has an arc-shaped luminance meter holding guide hole 28 centered on the measurement point P, and the arc-shaped surface rotation ratchet plate 26 is fixed to the edge of the lower outer diameter. The luminance meter fixing part 41 is configured to slide on the upper surface of the surface rotation guide plate 25 while sandwiching the upper and lower surfaces of the surface rotation guide plate 25 to which the surface rotation ratchet plate 26 is fixed. The approximately cross-shaped luminance meter holding slide plate 43 is biased and held by a biasing means such as a spring (not shown) so that it can slide in the inner diameter direction on the lower surface of the surface rotation guide plate 25, and has a roller (not shown) at the tip in the outer diameter direction.

As shown in Figures 4(A) and (B), the luminance meter fixing roller parts 42, 42 of the luminance meter fixing part 41 are separated by a predetermined width and abut the inner peripheral edge of the surface rotation ratchet plate part 26. In addition, the rollers (not shown) of the luminance meter holding slide plate part 43 are urged inwardly and abut against the uneven outer peripheral edge of the surface rotation ratchet plate part 26. That is, the luminance meter fixing part 41 is guided by the luminance meter fixing roller parts 42, 42 and the rollers (not shown) of the luminance meter holding slide plate part 43, which clamp the surface rotation ratchet plate part 26 and engage with the unevenness. Then, the luminance meter L slides on the upper surface of the surface rotation guide plate part 25 via the luminance meter fixing part 41, and performs surface rotation around the measurement point P while being engaged at every first predetermined angle.

The surface rotation guide plate handles 27, 27 are used when the measurer rotates the rotating holder 20 in a rolling motion. The luminance meter holder handles 44, 44 are used when the measurer rotates the surface of the luminance meter L. As shown in FIG. 4(A), the top surface of the surface rotation guide plate 25 has a scale and letters indicating the angle of surface rotation, and the luminance meter fixing part 41 has a surface rotation indicator (not shown) so that the measurer can read the surface rotation angle.

5A, 5B, and the like, the relationship between the rolling rotation display unit 23 and the rear frame unit 60 will be described. Fig. 5A is an exploded view of the rear frame unit 60 and related components as seen from the rear direction, and Fig. 5B is a perspective view as seen from the front direction.
5A and 5B, a rolling rotation angle display window 64 (rolling rotation angle display window) is formed as an arc-shaped hole above the rear holding hole 63, and a rear plate sliding plate picking hole 65 which is a vertically long hole above that is formed. The rear plate sliding plate 62 is biased downward by a biasing means such as a spring (not shown), and is configured to be able to slide up and down on the upper front surface of the rear plate 61.

As shown in Figures 5(A) and (B), the outer peripheral edge of the rolling rotation display unit 23 has recesses formed at every second predetermined angle, here every 22.5 degrees, and the inner peripheral side of the back surface has a scale and letters (rolling rotation angle display unit) indicating the angle of rolling rotation. In addition, the upper end of the rear plate sliding plate portion 62 is formed with a rear plate sliding plate knob portion 66 that protrudes toward the rear surface, and the lower end is formed with a rear plate sliding plate protrusion portion 67 that can fit into the recess of the rolling rotation display unit 23.

As shown in Figs. 5(A), (B) and 2(A), when the rotating holder 20 is rotated, the rolling rotation display unit 23 also rotates, and the scale and characters on the back of the rolling rotation display unit 23 are displayed in the rolling rotation angle display window 64. In addition, since the rear plate slide plate protrusion 67 fits into the recess of the rolling rotation display unit 23, the rotating holder 20 can be rotated while being locked at every second predetermined angle. In addition, since the rear plate slide plate knob 66 protrudes toward the rear side from the rear plate slide plate knob hole 65, the rear plate slide plate knob 66 is lifted from the rear side of the visual field angle measuring device 1 to rotate the rotating holder 20. This is to enable measurement by rotating the surface while being securely locked at a predetermined rolling rotation angle.

As shown in FIG. 2(A), the person measuring can visually check the rolling rotation angle through the rolling rotation angle display window 64 on the back of the visual field angle measuring device 1. In addition, the person measuring can lift the rear plate slide plate gripping portion 66 with one hand and hold the surface rotation guide plate handle portion 27 with the other hand to perform rolling rotation, allowing efficient measurement while visually checking the rolling rotation angle.

Figures 6 to 8 are design drawings of the external shape of the visual field angle measuring device 1. That is, Figure 6 (A) is a reference perspective view of the visual field angle measuring device 1 as seen from the front direction, Figure 6 (B) is a front view, Figure 7 (C) is a rear view, Figure 7 (D) is a top view, Figure 7 (E) is a bottom view, Figure 8 (F) is a left side view, Figure 8 (G) is a right side view, and Figure 8 (H) is a reference perspective view as seen from the rear direction.

As described above, the viewing angle measuring device 1 of the present invention positions the light shielding plate 11 in a parallel position at a predetermined distance by directly abutting the screen of the flat display 100 with the spacer portions 12, 12, 12, 12. The rolling rotation guide portion 21, which is a wide-area ring, slides on the back side of the light shielding plate portion 11, so that the rolling rotation guide portion 21 is also held precisely in a parallel position to the flat display 100. The surface rotation guide portion 22, which holds the luminance meter L so that it can rotate on the surface, is fixed to the rolling rotation guide portion 21, so that the luminance meter L is integrated with the flat display 100 at a position based on the screen and held precisely. In other words, it has become possible to configure a viewing angle measuring device 1 that is compact in structure and capable of precise measurements.

In this way, the measurer can easily measure the luminance meter L at a predetermined rolling rotation angle or surface rotation angle for the measurement point P of the flat display 100 by using the viewing angle measurement device 1. In particular, since the luminance meter L is configured to be locked at each predetermined angle when the luminance meter L is rolled or surface rotated, the measurer can perform the measurement extremely efficiently even if the measurement is performed manually. That is, if the viewing angle measurement device 1 does not have a surface rotation locking part or a rolling rotation angle locking part, when measuring at a certain angle, the measurer needs to fix the rotation according to the angle while looking at the scale and characters, and then perform the measurement. Moreover, this has to be repeated for each predetermined angle, which takes a lot of time and effort.
Here, the measurement point P refers to the center point of the measurement area of the luminance meter L.

The viewing angle measuring device 1 of the present invention has a compact structure yet is capable of performing measurements with high accuracy, and it is believed that the use of this viewing angle measuring device 1 will make a significant contribution to the development of improved viewing angles for flat panel displays.
In particular, whereas conventionally it would have been necessary to carry a flat display to a location where a measuring device was installed in order to carry out measurements, the viewing angle measuring device 1 is compact and can be easily carried to a location where a flat display is located and measurements can be taken.

For example, if the floor surface is uneven, it will be difficult to hold the viewing angle measuring device 1 integrally with the flat display 100, but it has been confirmed that measurements can be taken sufficiently practically in an actual room. Of course, if necessary, spacers can be inserted between the holding legs 210 of the stand 200 and the floor surface, a height adjustment mechanism can be provided on the holding legs 210, or a swivel mechanism can be provided.

In this embodiment, the rear holding shaft 24 at the center of the back surface of the rolling rotation display unit 23 serves as the rear rotation support part, and is rotatably held by the rear holding hole 63 of the rear plate 61, but this is not limited to the above. For example, it is of course possible to provide a hole, rather than an axis, at the center of the back surface of the rolling rotation display unit 23, and to hold it rotatably by an axis provided in the rear plate 61.

Furthermore, as a locking structure for rolling rotation, the rear panel slide plate protrusion 67 is adapted to fit into a recess in the rolling rotation display unit 23. The rotation holder 20 can be rotated by lifting the rear panel slide plate knob 66, but this is not limiting. Of course, it may be adapted to simply give a clicking sensation, as with the locking structure for surface rotation. Here, by providing a strong lock during rolling rotation, as described above, it has the effect of being firmly locked at a specified rolling angle, and the luminance meter L can be surface-rotated at that angle to perform measurements.

Furthermore, when the luminance meter is rotated by surface rotation or rolling, it is said that the first predetermined angle is locked at every 5 degrees and the second predetermined angle is locked at every 22.5 degrees, but this is not limited to this. Of course, it is also possible to lock at every 2.5 degrees, 10 degrees, or 30 degrees. It is also of course possible to change the depth of the recess so that a strong clicking sensation is obtained at larger angles, for example, every 90 degrees.

The viewing angle measuring device 1 of this embodiment is configured to perform measurements by moving it manually, but is not limited to this, and it is of course possible to add a geared motor, angle sensor, position sensor, etc. to configure it so that rolling rotation and surface rotation are performed electrically. In addition, it is of course possible to motorize the stand 200 so that it can be configured to extend and retract up and down or move on the floor surface by itself, so that a specified position on the screen of the flat display 100 can be measured automatically.

In addition, although the present embodiment has been described as using a luminance meter L to measure luminance as an optical measuring instrument, the viewing angle measuring device 1 may of course also be used when measuring chromaticity using a colorimeter or when performing various optical measurements. In this case, it is also possible to change the configuration of the luminance meter holding unit 40 and the rotating holding unit 20 by changing the measurement distance to suit the optical measuring instrument being used.

Flat display 100 generally has multiple screw holes at specified positions on the back in accordance with the VESA (registered trademark) (Video Electronics Standards Association) standard. Using these screw holes, flat display 100 can be easily configured to be held perpendicular to the floor surface. Furthermore, even if the screen size of flat display 100 becomes huge, it can be held perpendicular to the floor surface in the same manner, so that it can be measured by the viewing angle measuring device 1 of the present invention simply by enlarging the stand 200.

Second Embodiment
A second embodiment of the present invention will now be described with reference to FIGS.
In this second embodiment, the viewing angle measurement device 1 has a similar configuration to that of the first embodiment, but whereas in the first embodiment the viewing angle measurement device 1 is placed vertically for measurement, this embodiment is configured to measure the viewing angle in a horizontal position with the device facing downwards. Hereinafter, the same parts as in the first embodiment are given the same reference numerals, and descriptions thereof will be omitted, and only the different parts will be described. Note that in this embodiment as well, a case will be described in which luminance is measured using a luminance meter L as an optical measuring instrument.

Figure 9 is a perspective view showing an example of use of the visual field angle measurement device 1 in the second embodiment, Figure 10 is a perspective view showing the configuration of the visual field angle measurement device 1, Figure 11 is a perspective view showing the configuration of a portion of the visual field angle measurement device 1, and Figure 12 is a perspective view showing the configuration of another portion of the visual field angle measurement device 1.

As shown in FIG. 9, in the second embodiment, the flat display 100 is placed flat facing upward, and the viewing angle measuring device 1 is placed on the screen of the flat display 100 in a horizontal position with the spacer parts 12, 12 (spacer parts) facing downward, to measure the luminance. The viewing angle measuring device handle parts 14, 14 protruding upward are provided on both left and right ends of the light shielding plate part 11 (light shielding part). This is so that the viewing angle measuring device 1 can be placed by holding the viewing angle measuring device handle parts 14, 14 with both hands. In addition, the spacer part 12 has a larger area than the first embodiment. This is so that the weight is distributed by the wide spacer parts 12, 12, and strong force is not applied to part of the screen of the flat display 100.

The viewing angle measuring device 1 will now be described in detail with reference to FIGS.
As shown in Fig. 10, the viewing angle measurement device 1 has a light shielding part 10, a rotating holder 20 (rotating holder), and a luminance meter holder 40, but does not have a vertical holder 30 as in the first embodiment. This is because the viewing angle measurement device 1 is placed horizontally, and therefore does not require the vertical holder 30 for holding the viewing angle measurement device 1 in a vertical position. In addition, gravity makes it possible to more firmly attach the viewing angle measurement device 1 to the screen of the flat display 100, and the rotating holder 20 to the light shielding part 10.

As shown in FIG. 10, the light shielding unit 10 has a light shielding plate 11, spacer portions 12, 12, and viewing angle measuring device handle portions 14, 14, as well as a light shielding hole portion 13 (light shielding hole portion), rotation fixing portions 15, 15, 15, a rolling rotation slide plate portion 16 (rolling rotation lock portion), and a rolling rotation angle indicating plate portion 17. The light shielding plate portion 11 is made of a single plate of light metal such as aluminum with a matte coating. The spacer portions 12, 12 are made of a flexible material such as rubber, elastomer, or foam rubber in a rectangular shape, and are configured not to scratch the screen when placed on the flat display 100, and not to easily move the viewing angle measuring device 1 on the screen during measurement.

As shown in FIG. 10, the rotating holder 20 is made of a metal plate or the like, and has a rolling rotating guide 21 (ring guide) in the shape of a flat ring of a predetermined width, and a surface rotating guide 22 (surface rotating guide) fixed at both ends to the rolling rotating guide 21. The rolling rotating guide 21 has a circular outer diameter and an uneven inner diameter. The rolling rotating guide 21 is placed on the upper surface of the light shielding plate 11, and the rotating fixing parts 15, 15, 15 are fixed to the light shielding plate 11, so that the rolling rotating guide 21 slides on the upper surface of the light shielding plate 11. The rotating fixing parts 15, 15, 15 each have a roller (not shown) and hold the outer diameter of the rolling rotating guide 21 from three sides. That is, the rolling rotating guide 21 is configured to be rotatable around the measurement point P axis while sliding on the upper surface of the light shielding plate 11.

As shown in FIG. 10, the surface rotation guide 22 has a semicircular arch shape, an open outer periphery, and a generally U-shaped cross section, with projections and recesses formed on the outer periphery edge. The surface rotation guide 22 rotatably holds the luminance meter holder 40 and functions to rotate the luminance meter L, the details of which will be described later.

FIG. 11 shows the rolling rotation locking structure of this embodiment.
As shown in FIG. 11, the rolling rotation guide 21 has a recess on the inner circumference side at a second predetermined angle, here every 5 degrees, and the upper surface is provided with a scale and letters indicating the angle of rolling rotation in accordance with this recess. In addition, a rolling rotation angle indicator plate 17 for reading the angle of rolling rotation is fixed to the upper surface of the light shielding plate 11, and the rolling rotation slide plate 16 is provided so as to be slidable in the outer circumferential direction. The rolling rotation slide plate 16 has a roller at the tip in the outer circumferential direction, and is biased in the outer circumferential direction by a biasing means such as a spring (not shown). The roller of the rolling rotation slide plate 16 engages with the recess of the rolling rotation guide 21, so that it is configured to be locked at every second predetermined angle when rolling.

FIG. 12 shows the surface rotation locking structure of this embodiment.
As shown in FIG. 12, the luminance meter holding part 40 has a luminance meter fixing part 41, luminance meter fixing roller parts 42, 42, luminance meter holding slide plate parts 43, 43 (surface rotation locking parts), and a luminance meter holding slide plate roller part 45. In addition, a surface rotation angle display window part 46 is formed in the luminance meter holding slide plate part 43 on the back side. The luminance meter fixing part 41 is in the shape of a square tube, and the luminance meter L is completely accommodated and fixed in the inner part of the square tube. The upper part of the luminance meter fixing part 41 protrudes in the shape of an arm in the left and right directions, and is configured to rotatably hold the luminance meter fixing roller parts 42, 42. In addition, the front and rear surfaces of the luminance meter fixing part 41 are provided with rolling rotation slide plate parts 43, 43 that are slidable in the normal direction and biased in the inner diameter direction by a biasing means such as a spring, and the luminance meter holding slide plate roller part 45 is rotatably held at the tip part in the outer shape direction.

As shown in FIG. 12, the luminance meter fixing roller parts 42, 42 of the luminance meter fixing part 41 are rollers with flanges, which are spaced apart from each other by a predetermined width to the left and right and abut the inner peripheral surface of the surface rotation guide part 22. In addition, the luminance meter holding slide plate roller part 45 held by the luminance meter holding slide plate parts 43, 43 is biased inwardly and abuts against the uneven outer peripheral edge part of the surface rotation guide part 22. That is, the luminance meter fixing part 41 is guided while being engaged by the unevenness of the outer peripheral part of the surface rotation guide part 22, with the surface rotation guide part 22 sandwiched between the luminance meter fixing roller parts 42, 42 and the luminance meter holding slide plate roller part 45. Then, the luminance meter L moves through the surface rotation guide part 22 via the luminance meter fixing part 41, and performs surface rotation around the measurement point P while being engaged every 5 degrees, which is the first predetermined angle.

As described above, the viewing angle measuring device 1 of this embodiment is configured to be placed directly on the flat display 100, which is placed flat facing upward. Therefore, gravity brings the light shielding plate 11 into close contact with the flat display 100, and the light shielding plate 11 is placed in a parallel position at a predetermined distance. The rolling rotation guide 21, which is a wide-area ring, slides on the upper surface side of the light shielding plate 11, so that the rolling rotation guide 21 is also held precisely in a parallel position to the flat display 100. The rolling rotation guide 22, which holds the luminance meter L so that it can rotate on the surface, is fixed to the rolling rotation guide 21, so that the luminance meter L is held precisely in a position based on the screen of the flat display 100. In other words, it is possible to configure a viewing angle measuring device 1 that can measure precisely with a compact structure. In addition, since the viewing angle measuring device 1 is placed horizontally, the vertical holding unit 30 used in the first embodiment is no longer necessary, and a more compact and simple structure can be achieved.

In this way, by using the viewing angle measuring device 1, the measurer can easily measure the luminance meter L at a predetermined rolling rotation angle or surface rotation angle for the measurement point P of the flat display 100. In particular, since the luminance meter is configured to be locked at each predetermined angle when it is rolled or surface rotated, the measurer can perform measurements extremely efficiently even when performing manual measurements.

The viewing angle measurement device 1 of this embodiment has a compact structure yet is capable of performing measurements with high accuracy, and it is believed that the use of this viewing angle measurement device 1 will make a significant contribution to the development of improved viewing angles for flat panel displays.
In particular, whereas in the past it was necessary to bring a flat display to a location where a measuring device was installed in order to perform measurements, the viewing angle measuring device 1 of the present embodiment is even more compact and can be easily carried to a location where a flat display is located and measurements can be taken.

In addition, the viewing angle measuring device 1 is configured with the light shielding plate portion 11 and the spacer portion 12, 12 as separate bodies, but this is not limited to this and they may be configured as one body. For example, a thick resin plate with a light shielding hole portion 13 in the center may be used as the light shielding portion 10, and the bottom surface of the resin plate may be placed directly on the flat display 100.

In addition, although the viewing angle measuring device 1 of this embodiment has been described as being used in a horizontal position, this is not limited to this. For example, if the viewing angle measuring device handles 14, 14 are fixed to a mounting base of a frame such as an L-shaped structure, it can of course be used for vertical mounting as in the first embodiment. It can also of course be configured so that it can be used in an oblique position, etc., in accordance with the mounting angle of the flat display 100.

In addition, in the first embodiment, the surface rotation guide plate handles 27, 27 and the luminance meter holding part handles 44, 44 are used to perform rolling rotation and surface rotation, but in the second embodiment, no handles are used. Of course, in the second embodiment, such handles can be attached as appropriate to perform rolling rotation and surface rotation.

Although the viewing angle measurement device 1 of this embodiment is configured to perform measurements by moving it manually, the present invention is not limited to this, and it is of course possible to add a geared motor, angle sensor, position sensor, etc. to configure it to perform rolling rotation and surface rotation electrically. It is also of course possible to add electric wheels, etc. to the viewing angle measurement device 1 so that it can automatically move to a specified position on the screen of the flat display 100 and perform automatic measurements. This type of automatic measurement makes it possible to handle even large flat displays.

In addition, although the present embodiment has been described with respect to a case where luminance is measured using a luminance meter L as the optical measuring instrument, it goes without saying that the viewing angle measuring device 1 may also be used to measure chromaticity using a colorimeter or to perform various optical measurements, as in the first embodiment. In this case, it goes without saying that the configuration of the luminance meter holding unit 40 and the rotating holding unit 20 may be changed by changing the measurement distance in accordance with the optical measuring instrument being used.

The visual field angle measuring device of the present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the spirit and scope of the present invention.
For example, in the above-mentioned embodiment, the flat display to be measured for luminance has been described as having a large screen that the spacer part can abut, but this is not limited to this. In the case of a flat display with a small screen, measurement is possible by drilling a hole in the flat plate so that the flat display can fit in it, fixing the flat display flush with the surface of the flat plate, and abutting the spacer part against the flat plate. Of course, the viewing angle measuring device may be configured to be attached with a jig and a flat display with a small screen may be fixed to the jig for measurement.

L Luminance meter P Measurement point 1 View angle measuring device 10 Shading portion 11 Shading plate portion 12 Spacer portion 13 Shading hole portion 14 View angle measuring device grip portion 15 Rotation fixing portion 16 Rolling rotation slide plate portion 17 Rolling rotation angle indication plate portion 20 Rotation holding portion 21 Rolling rotation guide portion 22 Surface rotation guide portion 23 Rolling rotation display portion 24 Rear holding shaft portion 25 Surface rotation guide plate portion 26 Surface rotation ratchet plate portion 27 Surface rotation guide plate grip portion 28 Luminance meter holding portion guide hole portion 30 Vertical placement holding portion 31 Upper connecting portion 32 Lower connecting portion 40 Luminance meter holding portion 41 Luminance meter fixing portion 42 Luminance meter fixing roller portion 43 Luminance meter holding slide plate portion 44 Luminance meter holding portion grip portion 45 Luminance meter holding slide plate roller portion 46 Surface rotation angle display window portion 50 Front frame portion 51 Front plate portion 52 Rotation fixing portion 53 Front plate hole portion 54 Front plate guide portion 60 Rear frame portion 61 Rear plate portion 62 Rear plate sliding plate portion 63 Rear holding hole portion 64 Rolling rotation angle display window portion 65 Rear plate sliding plate gripping hole portion 66 Rear plate sliding plate gripping portion 67 Rear plate sliding plate protrusion portion 100 Flat display 200 Stand 210 Holding leg portion 220 Up and down extension portion 230 Upper plate portion 240 Fixing metal fitting portion

Claims (7)

A viewing angle measuring device configured to hold an optical measuring instrument at a predetermined angle relative to a measurement point on a flat display at a predetermined distance, which is a measurement distance of the optical measuring instrument, perform a rolling rotation to rotate the optical measuring instrument relatively to the flat display at the predetermined angle around an axis perpendicular to the flat display that passes through the measurement point, and perform a planar rotation to rotate the optical measuring instrument relatively to the flat display at the predetermined distance around the measurement point along a plane including the perpendicular axis and an optical axis of the optical measuring instrument,
the viewing angle measurement device includes a light blocking unit for blocking unnecessary light from the flat display, and a rotation holding unit for holding the optical measurement device so as to enable the rolling rotation and the plane rotation,
the light blocking unit includes a light blocking plate unit having a light blocking hole of a predetermined size centered on the measurement point, and a spacer unit for separating the flat display and the light blocking plate unit by a predetermined distance in parallel with each other,
the rotation holding portion has a ring guide portion that is substantially ring-shaped and is guided to be rotatable about the measurement point on the back side of the light blocking portion in parallel to the flat display, and a surface rotation guide portion that is fixed to the ring guide portion and holds the optical measuring device so as to be planar rotatable about the measurement point,
A visual field angle measuring device characterized by being configured to abut the spacer portion against the flat display, rotate the ring guide portion to cause a rolling rotation of the optical measuring instrument, and perform measurement by surface rotation of the optical measuring instrument using the surface rotation guide portion. 2. The visual field angle measuring device according to claim 1, wherein the surface rotation guide portion has a surface rotation locking portion, and is configured to be locked at every first predetermined angle when the optical measuring device is surface rotated. 3. The visual field angle measuring device according to claim 1, further comprising a rolling rotation locking portion configured to be locked at every second predetermined angle when the optical measuring instrument is rolled. the viewing angle measurement device has a vertical placement holding part for holding the viewing angle measurement device vertically,
the rotation holding portion has a rear rotation support portion at a position facing the measurement point at the rear of the surface rotation guide portion,
the vertical placement holding part includes a front plate that is fixed in close contact with the rear surface of the light-shielding part and has a front plate hole that is larger than or equal to the light-shielding hole, a rear plate that rotatably holds the rear rotation support part, a lower connecting part that connects the lower parts of the front plate and the rear plate, and an upper connecting part that connects the upper parts of the front plate and the rear plate ,
The visual field angle measuring device according to claim 3, characterized in that the rotational holding portion is configured so that the ring guide portion slides on the back side of the light-shielding portion while being rotatably guided via the front plate, and the rear rotation support portion is rotatably held by the rear plate, thereby being held vertically by the vertical holding portion and capable of rolling rotation. a rear rotating plate that rotates around the rear rotation support portion at the rear of the surface rotation guide portion,
5. The visual field angle measuring device according to claim 4, characterized in that the rear plate is provided with the rolling rotation locking portion, and the rolling rotation locking portion locks the rear rotating plate, thereby locking the optical measuring instrument at every second predetermined angle when the optical measuring instrument is rolled. A rolling rotation angle display unit is provided on the rear surface of the rear rotating plate for displaying a rolling rotation angle, which is an angle of how much the rear rotating plate has rolled from a reference angle,
6. The visual field angle measuring device according to claim 5, characterized in that the rear plate is provided with a rolling rotation angle display window, and a part of the rolling rotation angle display unit is displayed through the rolling rotation angle display window, thereby making it possible to check the rolling rotation angle from the rear side of the visual field angle measuring device. the viewing angle measurement device is configured to measure luminance by placing the flat display facing upward and flatly, and placing the viewing angle measurement device on the flat display in a horizontal position with the spacer portion facing downward,
the light blocking plate portion is made of a single plate and has the spacer portion made of a flexible material on its underside; when the flat display is placed flat facing upward and the viewing angle measuring device is placed directly on top of the flat display, the light blocking plate portion is placed in a position parallel to the flat display due to gravity,
the ring guide portion is ring-shaped, and is held in a parallel position to the flat display by sliding on an upper surface of the light shielding plate portion, and is configured to be capable of rolling rotation about the measurement point;
The surface rotation guide portion has a semicircular arch shape, both ends are fixed to the ring guide portion, and is configured to hold the optical measuring device so as to be surface rotatable about the measurement point.
4. The viewing angle measuring device according to claim 1, wherein the viewing angle is measured by a measuring device.

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