Viewing angle measuring device

Abstract

To provide a viewing angle measuring device capable of precisely performing measurement with a compact structure.SOLUTION: A viewing angle measuring device for performing measurement by performing rolling rotation or plane rotation of an optical measuring instrument for a flat-panel display includes a glare protection part, and a rotation holding part for holding rolling rotation and plane rotation so as to be capable of performing them for the optical measuring instrument. The glare protection part includes a glare protection plate part and a spacer part. The rotation holding part is in a nearly ring shape and includes a ring guide part in which a back side of the glare protection part is guided rotatably in parallel with the flat-panel display, and a plane rotation guide part that holds the optical measuring instrument plane-rotatably and is fixed to the ring guide part. The flat-panel display is brought into contact with the spacer part and is held integrally. The optical measuring instrument is rolling-rotated by rotating the ring guide part, and the optical measuring instrument is plane-rotated by the plane rotation guide part for measurement, thus the measurement is performed precisely with a compact structure.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a viewing angle measuring device, and more particularly to a viewing angle measuring device used when measuring with an optical measuring instrument while changing the angle with respect to a display screen. [Background technology]

[0002] 2. Description of the Related Art In recent years, with the development of 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 an optical measuring instrument while changing the angle relative to the display screen.

[0003] That is, in flat displays such as liquid crystal displays, organic electroluminescence displays, and plasma displays, people looking at the screen from an angle may find it difficult to see the screen compared to people looking at it from the front. In addition, because the eye heights of adults and children are different, it is important to see the screen from above, below, left, right, and diagonally. For this reason, liquid crystal displays and the like are improved by using viewing angle improving films, etc. In order to evaluate these, there is a demand for a device that can measure the viewing angle, which is the range of angles at which the screen display can be seen correctly, and that can be used when measuring with an optical measuring device by changing the angle relative to the display screen.

[0004] Such optical measuring instruments include luminance meters and color meters, but the optical measuring instrument must be kept at a predetermined measuring distance from a measurement point on the display screen. There is a demand for a device that can hold the optical measuring instrument at a predetermined angle to this measurement point and rotate it at a predetermined 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.

[0005] 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 a measurement point on a screen to be measured.

[0006] That is, an arc-shaped guide member having a centre 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 which can move freely on the guide member and has its focus set at its centre is set so as to be inclined at a prescribed angle relative to the measurement point, and the guide member is rotated so that the inclined luminance meter measures the luminance of the measurement point over 360°.

[0007] This wide-range, wide-angle luminance measuring device allows measurements over 360° by 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.

[0008] 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 the flat-panel display.

[0009] This characteristic measuring device is used to measure the viewing angle of a flat-panel display, and sets a vertical oscillation axis passing through the center of a reference plane of the display, sets a horizontal oscillation axis perpendicular to the vertical oscillation axis at the center of the reference plane, holds the display near the reference plane with a holding means for setting the reference plane, measures the distances to any three points on the display surface of the display using 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 plane from the distances at each point, moves the holding means to shorten the distance to the reference plane, 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 plane, repeats the process of re-measuring the distances at the three points and re-swinging the display around the vertical oscillation axis and the horizontal oscillation axis until the display is placed on the reference plane, 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.

[0010] That is, this characteristic measuring device adjusts and specifies the viewing angle by swinging the flat display relative to the viewing angle observation means by 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 a 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 the viewing angle observation means is supported so as to be movable up and down, left and right, and back and forth relative to the base.

[0011] Another such device is the vertical rotation type viewing angle varying device disclosed in Non-Patent Document 1. Like the characteristic measuring device disclosed in Patent Document 2, this device is a device that 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.

[0012] In other words, with this device, the desired measurement point can be set at any point on the panel surface, and the distance from that point, as well as the elevation and depression angles can be set arbitrarily, and the device will automatically move to the appropriate position, making it possible to perform display performance evaluation tests on flat panels. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] JP 2000-292256 A [Patent Document 2] JP2007-271350A [Non-patent literature]

[0014] [Non-Patent Document 1] Vertical rotation type viewing angle changer, [Retrieved July 30, 2021], Internet: http: / / www.osk.ecweb.jp / sub2.html Summary of the Invention [Problem to be solved by the invention]

[0015] However, in 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 the screen at the measurement distance, but there is the inconvenience that it is difficult to install accurately without any guide. Also, 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 unit that holds the luminance meter and a rotation mechanism, and there is the inconvenience that it is not easy to move the device.

[0016] In addition, in the technology described in Patent Document 2, since an arm is used for the horizontal axis swing, the distance and vertical position of the viewing angle observation means 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 adjust the viewing angle observation means back and forth and up and down relative to the flat display 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 robust 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 relatively.

[0017] In addition, although the technology described in Non-Patent Document 1 allows measurements while rotating the flat panel screen, it is necessary to hold the flat panel and the characteristic measuring device with high precision, and the entire device has an extremely robust and rigid structure and must be installed in a large space. In addition, larger and larger screens have appeared in recent years, and as the screen size becomes larger, the entire device must also become larger to accommodate it.

[0018] An object of the present invention is to provide a viewing angle measuring device that has a compact structure and is capable of performing measurements with high accuracy. [Means for solving the problem]

[0019] In order to solve the above problems, the present invention employs the following configuration.

[0020] 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.

[0021] 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 instrument is surface rotated.

[0022] The visual field angle measuring device is also characterized by having a rolling rotation locking portion, and is configured so that when the optical measuring device is rolled, it is locked at every second predetermined angle.

[0023] The visual field angle measuring device also 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 shading part and has a front plate hole that is larger or the same size as the shading hole, a rear plate that rotatably holds the rear pivot 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 pivot holding part having a rear pivot support part at a position facing the measurement point at the rear of the surface pivot guide part, and the pivot holding part is configured so that the ring guide part slides rotatably guided via the front plate on the back surface side of the shading part, and the rear pivot 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.

[0024] The rear of the surface rotation guide portion has a rear rotating plate that rotates around the rear rotation support portion, and the rear plate is provided with a rolling rotation locking portion, and the rolling rotation locking portion locks the rear rotating plate, so that when the optical measuring instrument is rolled, it is locked at every second predetermined angle.

[0025] 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 how much the plate has rolled from a reference angle, and the rear plate is provided with a rolling rotation angle display window through which a part of the rolling rotation angle display unit is displayed, thereby enabling the rolling rotation angle to be confirmed from the rear side of the visual field angle measuring device.

[0026] The flat display is placed flat facing upward, and the viewing angle measuring device is placed on the flat display in a horizontal position with the spacer portion facing downward, to measure the luminance. Effect of the Invention

[0027] According to the present invention, since it has the above-mentioned characteristics, it is possible to achieve the following.

[0028] A viewing 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 a 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 planar 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 including the perpendicular axis and the optical axis of the optical measuring device, the viewing angle measuring device having a light shielding unit for blocking unnecessary light from the flat display and a rotation holding unit for holding the optical measuring device so as to enable rolling rotation and planar rotation, the light shielding unit being configured to hold the optical measuring device at a predetermined angle relative to the measurement point on a flat display, The optical measuring instrument is configured to be rotated in a rolling manner by abutting the spacer portion against the flat display and rotating the ring guide portion in a plane around the measurement point, and the optical measuring instrument is configured to be rotated in a rolling manner by a plane rotation guide portion, and the optical measuring instrument is configured to be rotated in a plane around the measurement point by a plane rotation guide portion. Therefore, a viewing angle measuring device having a compact structure and capable of measuring with high accuracy can be obtained.

[0029] In addition, 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 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.

[0030] In addition, the visual field angle measuring device has a rolling rotation locking portion and is configured to be locked at every second predetermined angle when the optical measuring instrument is rolled, so that it is possible to easily lock it at every second predetermined angle when rolling and perform measurements.

[0031] In addition, 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-shielding part and has a front plate hole that is larger than or the same size as the light-shielding hole, a rear plate that rotatably holds the rear pivot 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, and the pivot holding part has a rear pivot support part at a position facing the measurement point at the rear of the surface pivot guide part, and the pivot holding part is configured so that the ring guide part slides on the back surface side of the light-shielding part while being rotatably guided via the front plate, and the rear pivot support part is rotatably held by the rear plate, and is held vertically by the vertical holding part and rotates in a rolling manner, so that the flat display can be arranged vertically and the visual field angle measuring device can be abutted against the flat display to perform accurate measurements.

[0032] In addition, the rear of the surface rotation guide portion has a rear rotating plate that rotates around the rear rotation support portion, 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 instrument is rolled, it is configured to lock at every second predetermined angle, making it possible to easily perform measurements by rolling rotation.

[0033] In addition, 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 how much the object has been rolled from a reference angle, and the rear plate is provided with a rolling rotation angle display window through which a portion of the rolling rotation angle display unit is displayed, allowing the rolling rotation angle to be confirmed from the rear side of the visual field angle measuring device, so that it is possible to perform measurements by rolling and rotating while checking the rolling rotation angle.

[0034] The flat display is placed flat facing upward, and the viewing angle measuring device is placed on the flat display in a horizontal position with the spacer portion facing downward, and the luminance is measured, so that a viewing angle measuring device with high accuracy can be obtained with a simple configuration. [Brief description of the drawings]

[0035] [Figure 1] FIG. 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. [Diagram 2] 1A and 1B show the configuration of a viewing angle measurement device according to a first embodiment of the present invention, in which (A) is a perspective view seen from the rear direction, and (B) is a perspective view seen from the front direction. [Diagram 3] 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. [Figure 4] 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 (A) is a perspective view seen from above, and (B) is a perspective view seen from below. [Diagram 5] 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 (A) is an exploded perspective view seen from the rear, and (B) is a perspective view seen from the front. [Figure 6] 1A and 1B show the configuration of a viewing angle measurement device according to a first embodiment of the present invention, where (A) is a reference perspective view and (B) is a front view. [Figure 7] 1 shows the configuration of a viewing angle measurement device according to a first embodiment of the present invention, where (C) is a rear view, (D) is a top view, and (E) is a bottom view. [Figure 8] 1 shows 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. [Figure 9] 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. [Figure 10] FIG. 11 is a perspective view seen from above, showing the configuration of a viewing angle measurement device according to a second embodiment of the present invention. [Figure 11] 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. [Figure 12] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] 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 visual angle measuring device is installed on a flat display and seen from the perspective of the person performing the measurement. The direction in which the flat display is located is referred to as the front direction (front direction) and the opposite direction is 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.

[0037] Here, 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 relative to the flat display at a predetermined distance 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.

[0038] (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 viewing angle measurement device 1, Figs. 2(A) and (B) are perspective views showing the configuration of the viewing 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 viewing angle measurement device 1, Fig. 5(A) is an exploded perspective view showing the configuration of another portion of the viewing angle measurement device 1, and Fig. 5(B) is a perspective view showing the configuration of that portion, and Figs. 6 to 8(A) to (H) are diagrams expressing the external shape of the viewing 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.

[0039] Fig. 1 is a usage 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 screen of a flat display 100 with a luminance meter L. As shown in Fig. 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.

[0040] 1, the stand 200 has a holding leg 210, a vertically extending and contracting part 220, an upper plate part 230, and fixing metal parts 240, 240, 240, 240. The stand 200 is stably placed on the floor by the holding leg 210. The vertically extending and contracting part 220 fixed to the upper part of the holding leg 210 is configured to be vertically extendable and contractible by a pantograph mechanism such as a jack, and holds the upper plate part 230 parallel to the floor. The viewing angle measuring device 1 fixed to the upper plate part 230 by the fixing metal parts 240, 240, 240, 240 is held at a predetermined position on the screen of the flat display 100 by the stand 200.

[0041] 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 (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.

[0042] 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 rotational holding section 20 (rotational holding section) for rotatably holding the luminance meter L, and a vertical placement holding section 30 (vertical placement holding section) for holding the viewing angle measurement device 1 in a vertical position. The luminance meter L is held by the rotational holding section 20 via the luminance meter holding section 40.

[0043] As shown in Figs. 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 inclined. 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.

[0044] As shown in Figures 2(A), (B) and 3, the vertical placement holding part 30 has a front frame part 50, a rear frame part 60, an upper connecting part 31 (upper connecting part) and a lower connecting part 32 (lower connecting part), and is made of a metal plate or the like. The rotating holding part 20 is held by the front frame part 50 and the rear frame part 60 so as to be rotatable from the front and rear. The upper and lower parts of the front frame part 50 and the rear frame part 60 are connected and fixed by the upper connecting part 31 and the lower connecting part 32, respectively. The lower connecting part 32 is configured so as to be able to be placed on a flat surface such as the upper plate part 230, and the front frame part 50 and the rear frame part 60 are configured so as to be perpendicular to the lower connecting part 32.

[0045] 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 rear surface of the front plate section 51 as described later. The front plate section 51 has an outer shape substantially the same as that of the light shielding plate section 11, and is substantially 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, substantially 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 rear surface of the front plate section 51 is thinly formed 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 later.

[0046] 2(A), (B) and 3, the rear frame section 60 has a flat, generally 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 described separately below.

[0047] As shown in Figures 2(A), (B) and 3, the rotation holding portion 20 has a flat, ring-shaped rolling rotation guide portion 21 (ring guide portion), a semicircular surface rotation guide portion 22 (surface rotation guide portion) with a square bulge at the rear, and a flat, disc-shaped rolling rotation display portion 23 (rear rotating plate), and is made of a metal plate or the like.

[0048] 2(A), (B) and 3, the rolling rotation guide section 21 is completely housed in a 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 slides within the front plate guide section 54. The rotating fixed sections 52, 52, 52 each have a roller (not shown) and hold the outer diameter section of the rolling rotation guide section 21 from three sides. That is, the rolling rotation guide section 21 is configured to be rotatable about the measurement point P axis while sliding along the back surface of the front plate section 51.

[0049] 2(A), (B) and 3, surface rotation guide section 22 is fixed vertically to rolling rotation guide section 21 in a slightly off-center position so that the optical axis of luminance meter L passes through measurement point P. Rolling rotation display section 23 is fixed vertically to the rear of surface rotation guide section 22 so that its center passes through the axis of measurement point P. A rear holding shaft section 24 (rear rotation support section) is fixed to the center of the rear surface of rolling rotation display section 23 so as to protrude toward the rear surface, and is configured to be rotatably held by rear holding hole section 63 of rear plate section 61.

[0050] That is, the rotating holder 20 is rotatably held with the rolling rotation guide 21 positioned up and down and left and right by the front frame 50, and the rear holding shaft 24 positioned by the rear frame 60. Here, the positioning of the rotating holder 20 in the front-to-back relationship is performed by the front frame 50 sliding on the back surface of the front plate 51, and the rear holding shaft 24 is provided with a small clearance in the front-to-back direction, so that it is not involved in the front-to-back positioning.

[0051] Now, with reference to Figures 4(A) and (B), we will explain how the luminance meter L is held so as to be capable of surface rotation via the luminance meter holding part 40 around the surface rotation guide part 22. Figure 4(A) is a perspective view of the surface rotation guide part 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 views in which the luminance meter L is shifted to the right of the viewing angle measuring device 1.

[0052] 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, luminance meter fixing roller sections 42, 42, a luminance meter holding slide plate section 43 (surface rotation locking section), and luminance meter holding section handle sections 44, 44. The outer peripheral edge section of the surface rotation ratchet plate section 26 has projections and recesses formed at intervals of 5 degrees, which is a first predetermined angle.

[0053] 4(A) and (B), the surface rotation guide plate 25 is provided with 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 substantially cross-shaped luminance meter holding slide plate 43 is biased and held by a biasing means such as a spring (not shown) so as to be slidable in the inner diameter direction on the lower surface of the surface rotation guide plate 25, and has a roller (not shown) at its tip in the outer diameter direction.

[0054] As shown in Fig. 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 against the inner peripheral edge of the surface rotation ratchet plate part 26. Also, 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 hold the surface rotation ratchet plate part 26 and are engaged by 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 about the measurement point P while being engaged at every first predetermined angle.

[0055] The surface rotation guide plate grips 27, 27 are used when the measurer rotates the rotating holder 20 in a rolling manner. The luminance meter holder grips 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 is provided with 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.

[0056] 5(A), (B), etc., the relationship between the rolling rotation display unit 23 and the rear frame unit 60 will be described. Fig. 5(A) is an exploded view of the rear frame unit 60 and related components seen from the rear direction, and Fig. 5(B) is a perspective view seen from the front direction. 5(A) and (B), a rolling rotation angle display window 64 (rolling rotation angle display window), which is an arc-shaped hole, is formed above the rear holding hole 63, and further above that a rear plate sliding plate picking hole 65, which is a vertically long hole, 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.

[0057] 5(A) and (B), the outer peripheral edge of the rolling rotation display part 23 is formed with recesses at every second predetermined angle, here every 22.5 degrees, and a scale and letters (rolling rotation angle display part) indicating the angle of rolling rotation are provided on the inner peripheral side of the back surface. In addition, a rear plate sliding plate knob part 66 that protrudes toward the back surface is formed at the upper end part of the rear plate sliding plate part 62, and a rear plate sliding plate protrusion part 67 that can be fitted into the recess part of the rolling rotation display part 23 is formed at the lower end part.

[0058] As shown in Figs. 5(A), (B) and 2(A), when the rotating holder 20 is rotated in a rolling manner, 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 in a rolling manner 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.

[0059] 2(A), the person measuring can visually confirm the rolling rotation angle through the rolling rotation angle display window 64 on the back of the visual field angle measurement device 1. In addition, the person measuring can lift the rear slide plate knob 66 ​​with one hand and hold the surface rotation guide plate handle 27 with the other hand to perform rolling rotation, which enables efficient measurement while visually checking the rolling rotation angle.

[0060] Figures 6 to 8 are design drawings showing 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.

[0061] As described above, the viewing angle measuring device 1 of the present invention directly abuts the screen of the flat display 100 with the spacer parts 12, 12, 12, 12, so that the light shielding plate part 11 is arranged in a parallel position at a predetermined distance. Since the rolling rotation guide part 21, which is a ring with a large area, is slid on the back side of the light shielding plate part 11, the rolling rotation guide part 21 is also held in a parallel position with the flat display 100 with high precision. Since the surface rotation guide part 22 that holds the luminance meter L so that it can be surface-rotated is fixed to the rolling rotation guide part 21, the luminance meter L is integrated with the flat display 100 at a position based on the screen of the flat display 100 and held with high precision. In other words, it has become possible to configure a viewing angle measuring device 1 that can perform accurate measurements with a compact structure.

[0062] In this way, the person using the viewing angle measuring device 1 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 L is configured to be locked at each predetermined angle when the luminance meter L is rolled or surface rotated, the person can perform the measurement very efficiently even if the person performs the measurement manually. That is, if the viewing angle measuring device 1 does not have a surface rotation locking part or a rolling rotation angle locking part, when measuring at a certain angle, the person 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.

[0063] The viewing angle measuring device 1 of the present invention has a compact structure yet is capable of performing accurate measurements, 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 display devices. 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, 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.

[0064] Here, 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 in an actual room, measurement can be performed sufficiently practically. Of course, if necessary, spacers may be inserted between the holding legs 210 of the stand 200 and the floor surface, or a height adjustment mechanism or a swing mechanism may be provided on the holding legs 210.

[0065] In this embodiment, the rear holding shaft 24 at the center of the back surface of the rolling rotation display unit 23 is used 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 limiting. For example, it is of course possible to provide a hole, rather than a shaft, at the center of the back surface of the rolling rotation display unit 23, and to hold this rotatably by a shaft provided in the rear plate 61.

[0066] Furthermore, as a locking structure during rolling rotation, the rear panel slide plate protrusion 67 is adapted to fit into the recess of the rolling rotation display unit 23. The rotation holding unit 20 is configured to be able to be rotated by lifting the rear panel slide plate knob 66, but is not limited thereto. Of course, it may be configured to simply give a clicking sensation, as with the locking structure during planar rotation. Here, by providing a strong lock during rolling rotation, as described above, it has the effect of being firmly locked at a predetermined rolling angle, and the luminance meter L can be planarly rotated at that angle to perform measurements.

[0067] Furthermore, although it has been described that the luminance meter is locked at every 5 degrees as the first predetermined angle and every 22.5 degrees as the second predetermined angle when rotated by surface rotation or rolling, this is not limiting. Of course, it may be locked at every 2.5 degrees, 10 degrees, or 30 degrees. Also, it is of course possible to change the depth of the recess so as to obtain a strong clicking sensation at large angles, for example, every 90 degrees.

[0068] Furthermore, although the viewing angle measuring device 1 of this embodiment is configured to perform measurement by manually moving it, the present invention is not limited to this, and it is of course possible to configure it so that rolling rotation and surface rotation are performed electrically by adding a geared motor, an angle sensor, a position sensor, etc. Also, it is of course possible to motorize the stand 200 so that it can be configured to extend and retract up and down or to move on the floor surface by itself, so that a predetermined position on the screen of the flat display 100 can be automatically measured.

[0069] Although the embodiment has been described with the luminance meter L used as the optical measuring instrument to measure luminance, 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. In this case, it goes without saying that the configurations of the luminance meter holding unit 40 and the rotary holding unit 20 may be changed by changing the measurement distance in accordance with the optical measuring instrument to be used.

[0070] Furthermore, the flat display 100 generally has a plurality of screw holes at predetermined positions on the back surface in accordance with the VESA (registered trademark) (Video Electronics Standards Association) standard. By using these screw holes, it is possible to easily configure the flat display 100 so that it is held perpendicular to the floor surface. Furthermore, even if the screen size of the flat display 100 becomes huge, it can be held perpendicular to the floor surface in the same manner, so that it becomes possible to perform measurements using the viewing angle measuring device 1 of the present invention simply by enlarging the stand 200.

[0071] Second Embodiment A second embodiment of the present invention will 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 in a horizontal position with the viewing angle measurement device 1 facing downwards. In the following, the same parts as those in the first embodiment are given the same reference numerals, and explanations will be omitted, and only the different parts will be explained. 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.

[0072] FIG. 9 is a perspective view showing an example of use of the visual field angle measurement device 1 in the second embodiment, FIG. 10 is a perspective view showing the configuration of the visual field angle measurement device 1, FIG. 11 is a perspective view showing the configuration of a portion of the visual field angle measurement device 1, and FIG. 12 is a perspective view showing the configuration of another portion of the visual field angle measurement device 1.

[0073] 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 that of the first embodiment. This is so that the weight is distributed by the wide spacer parts 12, 12, and a strong force is not applied to a part of the screen of the flat display 100.

[0074] Now, the viewing angle measuring device 1 will be described in detail with reference to FIGS. 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, and does not have a vertical placement 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 placement holder 30 for holding the viewing angle measurement device 1 in a vertical position. Also, 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.

[0075] As shown in Fig. 10, the light shielding unit 10 has a light shielding plate portion 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.

[0076] As shown in FIG. 10, the rotation holding part 20 is made of a metal plate or the like, and has a rolling rotation guide part 21 (ring guide part) in the shape of a flat ring of a predetermined width, and a surface rotation guide part 22 (surface rotation guide part) fixed at both ends to the rolling rotation guide part 21. The rolling rotation guide part 21 has a circular outer diameter part and an uneven inner diameter part. The rolling rotation guide part 21 is placed on the upper surface of the light shielding plate part 11, and is configured to slide on the upper surface of the light shielding plate part 11 by fixing the rotation fixing parts 15, 15, 15 to the light shielding plate part 11. In addition, the rotation fixing parts 15, 15, 15 each have a roller not shown, and hold the outer diameter part of the rolling rotation guide part 21 from three sides. That is, the rolling rotation guide part 21 is configured to be rotatable about the measurement point P axis while sliding on the upper surface of the light shielding plate part 11.

[0077] 10, the surface rotation guide part 22 has a semicircular arch shape, has a generally U-shaped cross section that is open on the outer periphery, and has projections and recesses on the outer periphery edge. The surface rotation guide part 22 rotatably holds the luminance meter holding part 40 and functions to surface rotate the luminance meter L, the details of which will be described later.

[0078] 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 able to slide 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 and the recess of the rolling rotation guide 21 engage with each other, so that the rolling rotation is stopped at every second predetermined angle when the rolling rotation is performed.

[0079] 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.

[0080] 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 separated from each other by a predetermined width on the left and right sides and are in contact with the inner peripheral surface of the surface rotation guide part 22. Also, the luminance meter holding slide plate roller part 45 held by the luminance meter holding slide plate parts 43, 43 is biased inwardly and in contact with the uneven outer peripheral edge part of the surface rotation guide part 22. That is, the luminance meter fixing part 41 is guided while the surface rotation guide part 22 is sandwiched between the luminance meter fixing roller parts 42, 42 and the luminance meter holding slide plate roller part 45 and is locked by the unevenness of the outer peripheral part of the surface rotation guide part 22. Then, the luminance meter L moves through the surface rotation guide part 22 via the luminance meter fixing part 41 and performs surface rotation about the measurement point P while being locked every 5 degrees, which is the first predetermined angle.

[0081] As described above, the viewing angle measuring device 1 of this embodiment is configured to be placed directly on the flat display 100 that is placed flat facing upward, so that the light shielding plate 11 is placed in a parallel position at a predetermined distance by gravity. The rolling rotation guide 21, which is a ring with a large area, is slid 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 surface rotation guide 22 that holds the luminance meter L so that it can be rotated is fixed to the rolling rotation guide 21, so that the luminance meter L is integrated with the flat display 100 at a position based on the screen of the flat display 100 and held precisely. That is, 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 not necessary, and a more compact and simple structure can be achieved.

[0082] 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 with respect to the measurement point P of the flat display 100. In particular, since the luminance meter is configured to be locked at every predetermined angle when it is rolled or surface rotated, the measurer can perform the measurement extremely efficiently even when performing the measurement manually.

[0083] The viewing angle measurement device 1 of this embodiment has a compact structure yet is capable of performing accurate measurements, 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 display devices. 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 this embodiment is even more compact and can be easily carried to a location where a flat display is located and measurements can be taken.

[0084] In the viewing angle measuring device 1, the light shielding plate portion 11 and the spacer portions 12, 12 are configured as separate bodies, but the present invention is not limited to this and they may be configured as one body. For example, a thick resin plate having a light shielding hole portion 13 in the center may be used as the light shielding portion 10, and the lower surface of the resin plate may be placed directly on the flat display 100.

[0085] In addition, although the viewing angle measuring device 1 of this embodiment has been described as being used in a horizontally placed state, this is not limited thereto. For example, if the viewing angle measuring device handles 14, 14 are fixed to a mounting stand of a frame such as an L-shaped structure, it can of course be used for a vertically placed state as in the first embodiment. Also, it can of course be configured so that it can be used in an obliquely placed state in accordance with the mounting angle of the flat display 100.

[0086] In the first embodiment, the rolling rotation and surface rotation are performed using the surface rotation guide plate handles 27, 27 and the luminance meter holding part handles 44, 44, but in the second embodiment, no handles are used. Of course, in the second embodiment, such handles may be attached as appropriate to perform the rolling rotation and surface rotation.

[0087] Furthermore, although the viewing angle measurement device 1 of this embodiment is configured to perform measurement by moving it manually, the present invention is not limited to this, and it is of course possible to add a geared motor, an angle sensor, a 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 by itself to a predetermined position on the screen of the flat display 100 and perform automatic measurement. Such automatic measurement makes it possible to handle even huge flat displays.

[0088] 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 viewing angle measuring device 1 may also be used when measuring chromaticity using a colorimeter or performing various optical measurements, as in the first embodiment. In this case, it goes without saying that the configurations of luminance meter holding unit 40 and rotating holding unit 20 may be changed by changing the measurement distance in accordance with the optical measuring instrument to be used.

[0089] 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. [Explanation of symbols]

[0090] L Luminance meter P Measurement point 1. Visual field measurement device 10 Light shielding section 11 Light shielding plate 12 Spacer part 13 Light-shielding hole 14 Viewing angle measuring device handle 15 Rotating fixed part 16 Rolling rotation slide plate section 17 Rolling angle indicator plate 20 Rotational support part 21 Rolling rotation guide part 22-surface rotating guide 23 Rolling display unit 24 Rear holding shaft 25-surface rotating guide plate 26-sided rotating ratchet plate 27-plane rotation guide plate handle 28 Luminance meter holder guide hole 30 Vertical installation support 31 Upper connection part 32 Lower connection part 40 Luminance meter holder 41 Luminance meter fixed part 42 Luminance meter fixed roller part 43 Luminance meter holding slide plate 44 Luminance meter holding part handle 45 Luminance meter holding slide plate roller part 46 Face rotation angle display window 50 Front frame part 51 Front plate part 52 Rotating fixed part 53 Front panel hole 54 Front plate guide 60 Rear frame section 61 Rear plate part 62 Rear plate slide plate section 63 Rear holding hole 64 Rolling rotation angle display window 65 Rear slide plate gripping hole 66 Rear plate slide plate knob 67 Rear slide plate protrusion 100 Flat screen display 200 Stand 210 Holding legs 220 Vertical telescoping section 230 Upper plate part 240 Fixing bracket part

Claims

1. 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, The spacer portion is brought into contact with the flat display, the ring guide portion is rotated to cause the optical measuring device to perform rolling rotation, and the optical measuring device is subjected to plane rotation by the plane rotation guide portion to perform measurement. A visual field angle measuring device comprising:

2. 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 instrument is surface rotated.

2. The viewing angle measuring device according to claim 1.

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

3. The viewing angle measuring device according to claim 1, wherein the viewing angle is measured by a measuring device.

4. 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 rotation holding portion is configured such that the ring guide portion slides on the back side of the light blocking portion while being rotatably guided via the front plate, and the rear rotation support portion is rotatably held by the rear plate, so that the rotation holding portion is held vertically by the vertical holding portion and rotates in a rolling manner.

4. The viewing angle measuring device according to claim 3.

5. a rear rotating plate that rotates around the rear rotation support portion at the rear of the surface rotation guide portion, The rear plate is provided with the rolling rotation locking portion, and the rolling rotation locking portion locks the rear rotating plate, so that the optical measuring instrument is locked at every second predetermined angle when the optical measuring instrument is rotated by rolling.

5. The viewing angle measuring device according to claim 4.

6. 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, A rolling rotation angle display window is provided on the rear plate, 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.

6. The viewing angle measuring device according to claim 5.

7. 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.

Images