Camera alignment jig
The camera alignment jig addresses the issue of display surface damage and complexity in conventional alignment methods by using a beveled half-mirror plate and support mechanism for precise, damage-free alignment, enabling efficient MTF measurements.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NIPPON HOSO KYOKAI
- Filing Date
- 2022-10-17
- Publication Date
- 2026-06-26
AI Technical Summary
Conventional methods for aligning the optical axis of a camera with a display surface for measurement require bulky equipment and can damage the display surface due to manual operation, necessitating a simpler and safer alignment method.
A camera alignment jig comprising a half-mirror plate with a beveled edge and a support mechanism that contacts the display surface, using a string-like member and weight to maintain contact without scratching, allowing for precise alignment without manual manipulation.
The camera alignment jig provides a simple, easy-to-use solution that minimizes display surface damage and ensures accurate alignment of the camera and display, facilitating precise measurements like MTF without the need for complex equipment.
Smart Images
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Abstract
Description
Technical Field
[0005]
[0001] The present invention relates to a camera alignment jig for aligning a camera used for measurement with a display before measuring characteristics of a display such as MTF (Modulation Transfer Function).
Background Art
[0002] Generally, when measuring characteristics of a display such as MTF, the optical axis of the camera is adjusted to be perpendicular to the display surface before measurement. For example, it is known that a laser oscillator is used to align the optical axis of the camera. Also, when aligning the optical axis of the camera with the display surface, for example, it is performed by a measuring device (see Non-Patent Document 1) incorporating a small camera. <000,0010>
Prior Art Documents
Patent Documents
[0003] [[ID=2′]]
Patent Document 1
Non-Patent Documents
Non-Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] However, conventional methods for aligning the optical axis require the use of laser oscillators and other components, resulting in bulky equipment. Furthermore, when using measuring devices with built-in small cameras, alignment is performed on the display surface, requiring operators to manually move the device to the appropriate position on the display screen, which can easily damage the display surface. In addition, there is a need for a simpler and easier-to-use device that incorporates mechanical components such as cameras in the part of the measuring device that contacts the display surface.
[0006] This invention was conceived in view of the aforementioned problems, and aims to provide a camera alignment jig that is simple in structure, easy to use, and less likely to scratch the display surface. [Means for solving the problem]
[0007] In one embodiment of the present invention, the camera alignment jig is a camera alignment jig that is placed on a display surface to align the display and the camera, and comprises a half-mirror plate that is placed with a first surface facing the display surface, and a support mechanism installed on a second surface which is the opposite surface of the first surface of the half-mirror plate, and which supports the first surface to contact the display surface, wherein the periphery of the first surface that contacts the display surface is beveled. [Effects of the Invention]
[0008] According to one aspect of the present invention, the camera alignment jig has a simple structure, is easy to use, and is less likely to scratch the display surface. [Brief explanation of the drawing]
[0009] [Figure 1] This is a perspective view showing the overall configuration using the camera alignment jig according to the embodiment. [Figure 2] This is a side view showing the overall configuration using the camera alignment jig shown in Figure 1. [Figure 3] This is a perspective view showing the camera alignment jig according to the embodiment positioned on the display surface. [Figure 4] This is a perspective view showing the support mechanism of the camera alignment jig according to the embodiment, viewed from the back side of the display. [Figure 5] (a) to (e) show the camera alignment jig according to the embodiment with the string-like member removed, where (a) is a front view of the camera alignment jig, (b) is a rear view of the camera alignment jig, (c) is a side view of the camera alignment jig, (d) is a top view of the camera alignment jig, and (e) is a perspective view of the camera alignment jig. [Figure 6] (a) is a front view showing a positioning mark on the display in an embodiment, and (b) is a front view showing a reference mark on the PC in an embodiment. [Figure 7] (a) is a front view showing the display positioning mark and reference mark superimposed on the PC monitor screen in an embodiment, and (b) is a front view showing the state after the camera lens has been moved and aligned from the state in (a). [Figure 8] (a) is a front view showing the state in which the image of the lens reflected in the half mirror and the reference mark are superimposed and displayed on the PC monitor screen in an embodiment, (b) is a front view showing the state in which the camera lens has been moved and aligned from the state in (a), and (c) is a top view front view showing the state in which the reference circle of the reference mark is aligned with the diameter of the camera lens. [Figure 9] (a) and (b) are a side view and a perspective view showing modified examples of the rod of the camera alignment jig according to the embodiment. [Figure 10] (a) and (b) are a side view and a perspective view showing a first application example of the camera alignment jig according to the embodiment. [Figure 11] (a) and (b) are a side view and a perspective view showing a second application example of the camera alignment jig according to the embodiment. [Modes for carrying out the invention]
[0010] The embodiments of the present invention will be described below, with an example of their application to the camera alignment jig 1. As shown in Figures 1, 2 and 5(a) to (e), the camera alignment jig 1 is positioned on the display surface 11 to align the display 10 and the camera 20. The camera alignment jig 1, as an example, includes a half-mirror plate 2 positioned with its first surface 2a facing the display surface 11, and a support mechanism 5 installed on the second surface 2b of the half-mirror plate 2, which is the opposite surface of the first surface 2a, and supports the first surface 2a so as to contact the display surface 11. The periphery 2c of the first surface 2a of the half-mirror plate 2 that contacts the display surface 11 is beveled.
[0011] The display 10 on which the camera alignment jig 1 is used is, for example, the object to be measured for MTF. The display 10 has a display surface 11 located within a frame 12 supported by legs 13, and has a housing 14 for displaying an image on the display surface 11 integrally on the back side of the display surface 11. Furthermore, it is preferable that the display 10 is fixed by a fixing device 15 so as not to be affected by vibrations when placed on the workbench T via the legs 13. The display 10 is configured so that a positioning mark P1, which serves as a reference for moving the position of the lens 21 of the camera 20 to the correct position, can be displayed on the display surface 11 by operation of the PC 30.
[0012] The fixing device 15 includes, as an example, an assembly block 16 having a through hole, a vertical support rod 17 inserted through the through hole of the assembly block 16, a horizontal support rod 18 inserted through the through hole of the assembly block 16 in a direction perpendicular to the vertical support rod 17, and a contact portion 19 that contacts the display 10. The contact portion 19 includes a first contact portion 19a installed on one end of the horizontal support rod 18 and contacting the back side of the display 10, and a second contact portion 19b that contacts the leg portion 13 of the display 10 to fix it in place. The workbench T has multiple recesses formed at regular intervals on its mounting surface (not shown), and an engaging projection 17a located at one end of the vertical support rod 17 of the fixing device 15 can engage with the recesses of the workbench T. In addition, the engaging pin 19b1 of the second contact portion 19b of the contact portion 19 can engage with the recesses of the workbench T.
[0013] The first contact portion 19a is formed of an elastic member such as rubber installed on one end side of the horizontal support bar 18. The first contact portion 19a is, as an example, formed in a disk shape with a predetermined thickness. Further, the second contact portion 19b includes, as an example, a first portion that contacts the upper surface of the leg portion 13, a second portion that contacts the upper surface of the workbench T, and a portion that connects the first portion and the second portion. By inserting the engaging pin 19b1 into the recess of the workbench T through the through hole formed in the second portion, the leg portion 13 side is fixed. In this way, the contact portion 19 fixes the display 10 so as not to vibrate by the first contact portion 19a contacting the back side of the display 10 at a plurality of locations and the second contact portion 19b contacting a plurality of locations on the leg portion 13 side on the front side of the display. Note that the number of installations of the first contact portion 19a and the second contact portion 19b is arbitrary, and the number of installations is not limited as long as the display 10 can be fixed so as not to vibrate.
[0014] The assembly block 16 is a block provided with through holes through which at least two of the vertical support bar 17 and the horizontal support bar 18 are inserted. This assembly block 16 has a first through hole through which the vertical support bar 17 is inserted, a vertical positioning screw 16a for contacting the vertical support bar 17 inserted through the first through hole and positioning the vertical support bar 17 at that position, a second through hole through which the horizontal support bar 18 is inserted, and a horizontal positioning screw 16b for contacting the horizontal support bar 18 inserted through the second through hole and positioning the horizontal support bar 18 at that position, and can be attached. Note that the fixing device 15 is not limited as long as it is a general one that can fix the display 10 to the workbench T. Further, as will be described later, one of the assembly blocks 16 supports the rotary shaft bar 8 of the support mechanism 5 with the assembly block 16 in a state where the direction of use is changed by 90 degrees compared to the other assembly blocks 16. And in the tightened state of the horizontal positioning screw 16b, the rotary shaft bar 8 is made rotatable or held.
[0015] The support mechanism 5 supports the half-mirror plate 2 in a position facing the display surface 11 and the camera 20, and abuts the half-mirror plate 2 against the display surface 11. The support mechanism 5 includes, as an example, a rod-shaped rod 3 disposed on the second surface 2b of the half-mirror plate 2, a weight 4 having a diameter larger than the diameter of the rod 3 disposed on the tip side of the rod 3, and a string-like member 6 engaged with the rod 3 and supported on the housing side of the display 10. Here, the support mechanism 5 rotatably supports a rotary shaft rod 8 for rotatably winding and feeding out the string-like member 6 on the assembly block 16. Further, the support mechanism 5 attaches the string-like member 6 to the rod 3 via an attachment ring 7.
[0016] The rod 3 is installed on the second surface 2b of the half-mirror plate 2. The rod 3 may be made of a material different from that of the half-mirror plate 2 or the same resin material. For example, when the half-mirror plate 2 is formed of an acrylic resin, it is preferable that the rod 3 is also formed of an acrylic resin from the viewpoint of adhesion strength. As an example, the rod 3 is formed in a cylindrical shape. When the half-mirror plate 2 is disposed on the display surface 11, the rod 3 is disposed so as to be above the center of the half-mirror plate 2. The length of the rod 3 is set within a range in which the first surface 2a of the half-mirror plate 2 suspended by the string-like member 6 can abut against the display surface 11 when the weight 4 is disposed on one end side of the rod 3.
[0017] The weight 4 facilitates contact between the half-mirror plate 2 and the display surface 11. The weight 4 is installed on one end of the rod 3. The weight 4 is, for example, a cylindrical member, preferably made of a material with a higher specific gravity than the material of the rod 3. Here, rubber, synthetic rubber, silicone rubber, etc., are used for the weight 4. The weight 4 may be fixed to the rod 3 with adhesive or the like, or it may be connected to the rod 3 so that it can be easily inserted and removed. The presence of the weight 4 ensures that a force is always applied in the direction that the half-mirror plate 2, which is suspended by the string-like member 6, comes into contact with the display surface 11. Since there are various configurations for the display 10 facing the camera 20, if the weight 4 is connected to the rod 3 so that it can be easily inserted and removed, the position of the weight 4 on the rod 3 can be changed to match the configuration of the display 10, making it possible to adjust the half-mirror plate 2 to properly contact the display surface 11. Furthermore, to allow the position of weight 4 to be adjusted along the longitudinal direction of rod 3, this can be achieved by detachably inserting rod 3 into the through-hole of weight 4 without using adhesive or the like.
[0018] The string-like member 6 is attached to the rod 3 via a mounting ring 7 at one end, and the other end is wound around a retractable rotating shaft 8 that can be wound up and fed out. The string-like member 6 may be made of a common material, such as cotton or a resin such as nylon. Furthermore, the cross-sectional shape of the string-like member 6 is not particularly limited and may be circular or flat. In addition, the thickness of the string-like member 6 is not limited as long as it is thick enough to hold the half-mirror plate 2, the rod 3, and the weight 4.
[0019] The mounting ring 7 is for attaching the string-like member 6 to the rod 3. The mounting ring 7 is formed as a C-shaped ring of resin or metal, with a portion of the annular shape being inconsistent. The mounting ring 7 can be forcibly widened in its C-shaped opening to become larger than the diameter of the rod 3, allowing it to be attached to the rod 3 detachably. Alternatively, the mounting ring 7 may be installed in an annular shape, pre-attached to the rod 3, and then the weight 4 can be attached to the rod 3.
[0020] The rotating shaft 8 is rotatably supported by the assembly block 16 and is used to wind up and unwind the string-like member 6. The rotating shaft 8 is inserted into the second through hole in the assembly block 16 into which the horizontal support rod 18 is inserted, with its orientation 90 degrees different from the other assembly blocks 16, and is supported by a horizontal position fixing screw 16b. Therefore, the operator releases the tightening of the horizontal position fixing screw 16b and rotates the rotating shaft 8 with their fingers to unwind and wind up the string-like member 6. Although the rotating shaft 8 has been described as being rotatably supported via the assembly block 16 of the fixing device 15, it may also be supported and used with a device that can perform winding and unwinding independently of the fixing device 15. Furthermore, although the rotating shaft 8 has been described as being rotated by the operator's fingers, it may also be configured to be rotated electrically via a drive motor.
[0021] As shown in Figures 1, 5(a) to 5(e), and 6, the half-mirror plate 2 is positioned so that the center of the camera 20 and the center of the half-mirror plate 2 that contacts the display surface 11 are directly aligned. The half-mirror plate 2 is formed, for example, by making a circular shape out of transparent acrylic resin. This half-mirror plate 2 can be formed by providing or attaching a thin metal film or a dielectric multilayer film to one or both of the first surface 2a or the second surface 2b. The edge of the peripheral edge 2c of the first surface 2a of the half-mirror plate 2 is beveled. Note that although the half-mirror plate 2 is shown with the edge of the peripheral edge 2c of the first surface 2a beveled, the edge of the peripheral edge of the second surface 2b may also be further beveled.
[0022] The beveled edge 2c of the first surface 2a of the half-mirror plate 2 prevents damage to the display surface 11 even when the edge 2c of the half-mirror plate 2 comes into contact with it when the half-mirror plate 2 is manipulated to position it on the display surface 11. The size of the half-mirror plate 2 is preferably such that it can reflect the entire lens of the camera 20 and capture it as an image. In addition, although the shape of the half-mirror plate 2 is shown as circular, it is not limited to a rectangle, regular polygon, or any other shape that can capture the image of the lens from the front of the camera 20, in addition to its size. The half-mirror plate 2 is positioned approximately in the center of the positioning mark P1 displayed on the display surface 11 via a support mechanism 5.
[0023] As shown in Figures 1 and 2, the camera 20 comprises a lens 21, a camera body 22, and an attitude control mechanism 23. Preferably, the camera 20 has the accuracy to determine the characteristics of the display 10. For example, the camera 20 can measure MTF. The camera 20 is attitude-controlled so that the positioning mark P1 displayed on the display aligns with the center of the lens 21. The image captured by the camera 20 is set to be displayed on the monitor screen 31 of a personal computer (hereinafter referred to as PC) 30 prepared on the workbench T.
[0024] The attitude control mechanism 23 for camera 20 adjusts the position of camera 20 mounted on the table. The attitude control mechanism 23 controls the attitude of camera 20 by moving the table surface by rotating a knob in the X direction, the Y direction perpendicular to the X direction, the Z direction perpendicular to the XY plane, and the θ direction around the Z direction, when the work surface of the workbench T is considered the XY plane. The attitude control mechanism 23 can use a general configuration used in this type of camera, such as a tilting and rotating stage or an X / Y / Z stage. The camera 20 used here is configured to display the captured video on the monitor screen 31 of PC 30 via wireless (such as Bluetooth®) or wired connection. For example, PC 30 is configured to capture images with camera 20 and operate the display 10.
[0025] Next, we will explain how to use the camera alignment jig 1. First, the display 10 is fixed to the workbench T using the fixing device 15. Here, the legs 13 of the display 10 are fixed by the second contact portion 19b of the contact portion 19, and the first contact portion 19a of the contact portion 19 is brought into contact with the housing portion 14, which is the back surface of the display 10, by the vertical support rod 17 and the horizontal support rod 18 inserted through the assembly block 16, thereby fixing the display 10 to the workbench T. Note that the workbench T has a number of recesses formed in the matrix direction at predetermined intervals, and the display 10 is fixed to the workbench T by the fixing device 15 by engaging the engaging pin 19b1 of the fixing device 15 and the engaging projection 17a of the vertical support rod 17 with these recesses.
[0026] Once the display 10 is fixed to the workbench T with a fixing device 15, the rotating shaft rod 8 of the camera alignment jig 1 is placed on one of the assembly blocks 16. The camera alignment jig 1 is then positioned so that the first surface 2a of the half-mirror plate 2 faces the display surface 11 of the display 10, with one end of the string-like member 6 wrapped around the rotating shaft rod 8 and the other end of the string-like member 6 attached to the rod 3 via the mounting ring 7. Furthermore, the length of the string-like member 6 is adjusted by rotating the rotating shaft rod 8 so that the positioning mark P1 is located approximately in the center of the half-mirror plate 2. Since the half-mirror plate 2 has a weight 4 via the rod 3, it is always biased toward the display surface 11 by the weight 4, and the first surface 2a is in contact with the display surface 11. Furthermore, because of the weight 4, the half-mirror plate 2 is always in contact with the display surface 11. When moving and adjusting the half-mirror plate 2 to the appropriate position, the periphery 2c of the first surface 2a of the half-mirror plate 2 is chamfered, and there is no edge, so the display surface 11 will not be scratched by the half-mirror plate 2. After setting up the camera alignment jig 1, the orientation of the camera 20 is adjusted. As shown in Figure 6(a), the display 10 is set to display the positioning mark P1 for alignment by operating the PC 30.
[0027] Camera 20 is positioned at a certain distance from the front of the display 10. Often, camera 20 is mounted on a rail that allows it to move toward the display 10, and it is convenient to be able to adjust the relative position of camera 20 and the display 10 by moving it via this rail (not shown in the diagram). The distance between the camera 20 and the display 10 is adjusted after the half-mirror plate 2 is positioned on the display surface 11 via the support mechanism 5. The distance between the camera 20 and the display 10 is adjusted by moving the camera 20 to a position where the entire captured image of the half-mirror plate 2 is displayed on the monitor screen 31 of the PC 30, while the image captured by the camera 20 is displayed on the monitor screen 31.
[0028] Incidentally, as shown in Figure 6(a), the display 10 displays a positioning mark P1, which is a mark indicating the reference position. Also, as shown in Figure 6(b), the monitor screen 31 of the PC 30 displays a reference mark S for aligning the lens 21 of the camera 20, which was determined by the MTF measurement software used for pre-measurement. As shown in Figure 7(a), the camera 20 is focused on the positioning mark P1 on the display surface 11, and the image P1g of the positioning mark P1 is displayed on the monitor screen 31 of the PC 30, superimposed on the reference mark S. Then, the attitude control mechanism 23 of the camera 20 is operated to align the image P1g of the positioning mark P1 being captured with the center intersection of the reference marks S, as shown in Figure 7(b). The attitude control mechanism 23 can adjust the position, tilt, and rotation of the lens 21 of the camera 20, so the operator adjusts the position of the camera 20 to adjust the position of the lens 21 in the image. In the drawing, the position of the lens 21 is adjusted by operating the knobs of the attitude control mechanism 23 that move in each direction.
[0029] Next, as shown in Figure 8(a), the camera's focus is switched to the image 21g of the lens 21 of the camera 20, which is reflected in the half-mirror 2. Then, the image 21g of the lens 21 is displayed on the monitor screen 31 of the PC 30, superimposed on the reference mark S. Then, as shown in Figure 8(b), the position of the lens 21 is adjusted by operating the attitude control mechanism 23 of the camera 20 so that the image 21 of the lens 21 is centered on the reference mark S. Furthermore, as shown in Figure 8(c), by adjusting the diameter of the reference circle S2 of the reference mark S to match the diameter of the image 21g of the lens 21, alignment between the image 21g of the lens 21 and the reference mark S can be achieved. In other words, by matching the diameter of the reference circle S2 with the diameter of the image 21g of the lens 21, it becomes easier to judge positional misalignment, and highly accurate alignment becomes possible.
[0030] Furthermore, the operations performed in Figures 7(a) and 7(b) are repeated, followed by the operations performed in Figures 8(a) and 8(b). The attitude control mechanism 23 is repeatedly operated until, on the monitor screen 31 of the PC 30 shown in Figure 7(a), the intersection point of the image P1g of the positioning mark P1 and the reference line S1 of the reference mark S coincides, and on the monitor screen 31 of the PC 30 shown in Figure 8(a), the image 21g of the lens 21 and the reference circle S2 of the reference mark S overlap and coincide in the center. By performing this alignment work, the optical axis of the lens 21 of the camera 20 and the positioning mark P1 of the display 10 are aligned, and the lens 21 of the camera 20 and the display 10 are directly facing each other.
[0031] Here, we have explained that the display 10 and camera 20 are aligned by first aligning the image P1g of the positioning mark P1 on the display 10 with the reference mark S, and then aligning the image 21g of the lens 21 of the camera 20 with the reference mark S, and repeating these operations. This alignment operation can also be performed by first aligning the image 21g of the lens 21 of the camera 20 with the reference mark S, then aligning the positioning mark P1 on the display 10 with the reference mark S, and repeating these operations alternately.
[0032] Although the operation of the camera 20's attitude control mechanism 23 was described as being performed manually by the operator, it is also acceptable to use an attitude control mechanism that can be controlled in conjunction with the PC 30, and to operate the camera 20's attitude control mechanism 23 by pressing the arrow button on the PC 30. Furthermore, it is also acceptable to pre-configure the PC 30 so that when the camera 20's attitude control mechanism 23 moves the lens 21 and the center of the camera's image 21g aligns with the image P1g of the positioning mark P1, the PC can emit a sound or display when they align.
[0033] Once the alignment between the positioning mark P1 on the display surface 11 and the center of the lens 21 of the camera 20 is complete, the camera alignment jig 1 can be removed from the display 10, and the camera 20, now facing the display 10, can be used to accurately perform tasks such as measuring the MTF of the display 10. When measuring the MTF of the display 10, for example, a reference plate 40 (see Figures 1 and 2) prepared in advance on the workbench T can be used. Thus, the camera alignment jig 1 has a simple structure and is easy to operate, and it also makes it easy to align the display 10 and the camera 20.
[0034] The camera alignment jig 1 may have a configuration such as those shown in Figures 9 to 11. In the following description, the camera alignment jig may be omitted from illustrations and its description may be omitted if the same reference numerals are used for components that have already been described. As shown in Figure 9, the camera alignment jig 1A has a rod 3A with grooves or recesses in a direction perpendicular to the longitudinal direction. As an example, the camera alignment jig 1A may be configured to have multiple protrusions 3A1 and recesses 3A2 continuously arranged in the longitudinal direction on the rod 3A. By providing the rod 3A with protrusions 3A1 and recesses 3A2, the position of the mounting ring 7 of the string-like member 6 can be fixed, preventing it from shifting during operation. In addition, by changing the position of the mounting ring 7 on the rod 3A, the state in which the load of the weight 4 is applied can be changed, and the half-mirror plate 2 can accurately contact the display surface 11. Note that although the shapes of the protrusions 3A1 and recesses 3A2 are shown as sharp-angled concave and concave shapes, they may also be wave-shaped concave and concave shapes, and the shape of the concave and concave shapes is not limited.
[0035] As shown in Figure 10, the camera alignment jig 1B is equipped with a support mechanism 5B on the second surface 2b of the half-mirror plate 2. The support mechanism 5B includes a support leg 6B connected at one end to the lower side of the center of the second surface 2b of the half-mirror plate 2, and a fixing part 8B that supports the other end of the support leg 6B and is positioned on the installation surface. The support leg 6B is a bendable metal wire and is configured to support the half-mirror plate 2 while maintaining the bent state of the metal wire. One end 7B2 of the support leg 6B is rotatably connected to a receiving portion 7B1 which is formed in a spherical shape and installed on the second surface 2b.
[0036] In other words, it is preferable that the support leg 6B is configured such that the connecting portion 7B is a universal monkey joint. The other end of the support leg 6B is connected to the fixing portion 8B which serves as a base. For example, the support leg 6B has a metal wire inside and the outside of the metal wire is covered with a covering material such as resin, rubber, or silicone rubber. The support leg 6B has two legs, a first support leg and a second support leg, connected to a position below the center of the second surface 2b of the half mirror plate 2, and the operator can freely bend the two support legs 6B with their fingers to bring the first surface 2a of the half mirror plate 2 into contact with the display surface 11. For example, the fixing portion 8B is formed in a disc shape and is preferably made of metal. In addition, by having one end of the support leg 6B below the center of the second surface 2b of the half mirror plate 2, the support leg is prevented from appearing in the image and does not interfere with the adjustment of the lens position.
[0037] When the camera alignment jig 1B is placed on the workbench T with the first surface 2a of the half-mirror plate 2 in contact with the display surface 11, the connecting portion 7B operates so that the first surface 2a of the half-mirror plate 2 is always in contact with the display surface 11. In other words, because the connection between the connecting portion 7B and the support legs 6B is loose, the half-mirror plate 2 connected at the connecting portion 7B can follow the position of the side it is in contact with. Furthermore, since the first and second support legs 6B can be freely bent, the height position of the half-mirror plate 2 from the workbench T can be freely adjusted.
[0038] As shown in Figure 11, the camera alignment jig 1C is equipped with a support mechanism 5C on the second surface 2b of the half-mirror plate 2. The support mechanism 5C has support legs 6C that are positioned downward from the center of the half-mirror plate 2 via a connecting portion 7C. The connecting portion 7C is a universal joint that rotatably supports one end 7C2 of the support leg 6C. The connecting portion 7C rotatably supports the spherical end 7C2 on a receiving portion 7C1. A fixing portion 8C for support on a workbench T is attached to the other end of the support leg 6C. This fixing portion 8C is made of an elastic material such as rubber, synthetic rubber, silicone rubber, or synthetic silicone rubber, and the side that rests on the workbench T is formed in a hemispherical shape. As an example, the support leg 6C comprises two support legs, a first support leg and a second support leg, and is formed in a rod shape from resin, metal, wood, etc. Preferably, the connecting portion 7C is positioned at the left and right ends in the center of the height direction of the half-mirror plate 2.
[0039] When the camera alignment jig 1C is placed on the workbench T with the first surface 2a of the half-mirror plate 2 in contact with the display surface 11, the connecting part 7C operates so that the first surface 2a of the half-mirror plate 2 is always in contact with the display surface 11. In other words, because the connection between the connecting part 7C and the support leg 6C is loose, the contact state is maintained by its own weight, and the half-mirror plate 2 connected to the connecting part 7C can follow the position of the side it is in contact with. Furthermore, by increasing the inclination angle of the support leg 6C with respect to the workbench T, the height position of the half-mirror plate 2 from the workbench T can be freely adjusted. Even when the inclination angle of the support leg 6C with respect to the workbench T is increased, one end of the fixing part 8C is hemispherical, so it is possible to maintain a state in which the half-mirror plate 2 can be properly supported on the workbench T.
[0040] Furthermore, a center mark indicating the center point may be provided at the center of the half-mirror plate 2, with a different shape from the positioning mark displayed on the display surface 11. This center mark may be, for example, drawn directly on the surface of the half-mirror plate 2, attached with a sticker, or formed by laser or mechanically engraving or drilling a hole in the surface. The center mark may be, for example, a cross, and should be aligned with the center of the camera 20 lens and the positioning mark P1 on the display surface 11 before alignment is performed. In other words, by moving the half-mirror plate 2 so that the positioning mark P1 on the display surface 11 and the center mark of the half-mirror plate 2 coincide, the half-mirror plate 2 can be positioned in a more appropriate location.
[0041] The embodiments and modifications of the present invention have been described above. The present invention is not limited to the embodiments and modifications described above. It can be modified as appropriate within the scope of the technical idea of the invention. Furthermore, the embodiments and modifications do not necessarily have to be used independently. The embodiments and modifications may be combined. [Explanation of Symbols]
[0042] 1, 1A, 1B, 1C Camera alignment jig 2 Half-mirror plate 2a 1st page 2b 2nd side 2c Periphery 3, 3A Rod 3A1 protrusion 3A2 recess 4 weights 5, 5B Support mechanism 6. String-like member 6B, 6C Support legs 7 Mounting ring 7B2, 7C2 One end 7B1, 7C1 receiving part 7B, 7C connection part 8 Rotating shaft rods 8B, 8C fixed part 10 displays 11 Display surface 12 Frame 13 Legs 14. Enclosure 15 Fixtures 16 Assembly Blocks 16a Vertical positioning screw 16b Horizontal positioning screw 17 Vertical support rod 17a Engagement protrusion 18 Horizontal support rod 19 Contact part 19b1 Engaging pin 19a 1st contact part 19b Second contact part 20 cameras 21 lenses 21g (lens) image 22 Camera body 23 Attitude control mechanism 30 PC 31 Monitor screen 40 Reference plate P1 Positioning Mark P1g (positioning mark) video T Workbench
Claims
1. A camera alignment jig that is positioned on the display surface to ensure the display and camera are aligned directly, A half-mirror plate is positioned with its first surface facing the display surface, The half-mirror plate is provided with a support mechanism installed on the second surface, which is the opposite surface to the first surface, and which supports the first surface so as to be in contact with the display surface. The aforementioned half-mirror plate is a camera alignment jig in which the periphery of the first surface that contacts the display surface is beveled.
2. The camera alignment jig according to claim 1, wherein the half-mirror plate is circular.
3. The camera alignment jig according to claim 1, wherein the half-mirror plate is made of acrylic resin.
4. The support mechanism comprises a rod-shaped rod positioned on the second surface of the half-mirror plate, a weight positioned at the tip of the rod having a larger diameter than the rod, and a string-like member that engages with the rod and is supported on the housing side of the display. The camera alignment jig according to claim 1 or claim 2, wherein the rod is positioned above the center of the half-mirror plate on the display surface.
5. The support mechanism comprises a support leg with one end connected downward from the center of the second surface of the half-mirror plate, and a fixing part that supports the other end of the support leg and is positioned on the installation surface. The camera alignment jig according to claim 1 or 2, wherein the support legs are bendable metal wires, and the half-mirror plate is supported while maintaining the bent state of the metal wires.
6. The support mechanism has support legs that are positioned downward from the center of the second surface of the half-mirror plate via a connecting portion. The camera alignment jig according to claim 1 or claim 2, wherein the connecting portion is a universal joint rotatably supported at one end of the support leg.