A prism calibration device and parallelism calibration method

Abstract

This invention belongs to the field of parallelism calibration technology, and particularly relates to a prism calibration device and a parallelism calibration method. The prism calibration device includes a cylinder and at least two prism modules spaced apart within the cylinder along its axial direction. Each prism module has a semi-transparent, semi-reflective surface, with one side of the semi-transparent, semi-reflective surface being the incident side and the other side being the transmission side. The semi-transparent, semi-reflective surfaces of the at least two prism modules are parallel and have a 45-degree angle between the incident side of the semi-transparent, semi-reflective surface and the axis of the cylinder. A first calibration hole is provided on the side wall of the cylinder corresponding to the incident side of the semi-transparent, semi-reflective surface. The parallelism calibration method includes the following steps: Step 1, fixing the end of the cylinder corresponding to the incident side of the semi-transparent, semi-reflective surface to an autocollimator to calibrate the prism modules; Step 2, setting the prism calibration device with the product to be calibrated and calibrating the component to be calibrated. This solves the problem of low calibration accuracy of existing parallelism calibration tools.

Description

Technical Field

[0001] This invention belongs to the field of parallelism calibration technology, and particularly relates to a prism calibration device and a parallelism calibration method. Background Technology

[0002] VR / AR products are increasingly appearing in daily life. Common VR / AR products have two VR / AR modules and are binocular products. The installation accuracy between the two VR / AR modules directly affects the accuracy of the VR / AR product and the user experience performance.

[0003] Currently, the two VR / AR modules are positioned using two module mounting fixtures, and then glued to the frame based on these positions. Therefore, to ensure the parallelism between the two VR / AR modules, the parallelism between the two module mounting fixtures must first be ensured. Traditional mechanical calibration uses dial indicators and marble gauges to adjust the parallelism between the two mounting planes. This method has low accuracy and cannot meet the increasingly higher precision requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a prism calibration device and a parallelism calibration method, which aims to solve the problem of low calibration accuracy of existing parallelism calibration tools.

[0005] This invention discloses a prism calibration device, which includes a cylindrical body and at least two prism modules spaced apart within the cylindrical body along its axial direction. Each prism module has a semi-transparent and semi-reflective surface, with one side of the semi-transparent and semi-reflective surface being the incident side and the other side being the transmission side. The semi-transparent and semi-reflective surfaces of the at least two prism modules are parallel and have a 45-degree angle between the incident side of the semi-transparent and semi-reflective surface and the axial direction of the cylindrical body. A first calibration hole is provided on the side wall of the cylindrical body corresponding to the incident side of the semi-transparent and semi-reflective surface of each prism module.

[0006] As an improvement, a second calibration hole is provided on the cylinder sidewall corresponding to the transmission side of the semi-transparent and semi-reflective side of each prism module.

[0007] As an improvement, a first cover and a second cover are respectively provided on the first calibration hole and the second calibration hole.

[0008] As an improvement, the prism module includes a shell forming a cavity, a cover plate covering the cavity opening, and a beam splitter prism positioned between the cover plate and the cavity of the shell. A first shell through hole is provided on the shell sidewall corresponding to the cover plate. A second shell through hole and a third shell through hole are provided on the shell at positions corresponding to the first calibration hole and the second calibration hole, respectively. A cover plate through hole is provided on the cover plate.

[0009] As an improvement, the cover plate is disposed on the transmissive side of the semi-transparent and semi-reflective surface.

[0010] As an improvement, a connecting structure is provided at the end of the cylinder corresponding to the incident side of the semi-transparent and semi-reflective surface.

[0011] As an improvement, a sealing structure is provided at the through hole of the cover plate of the prism module at the end of the cylinder away from the connecting structure, and the sealing structure is integrated with the cover plate.

[0012] As an improvement, the connecting structure includes a plate fixedly connected to the end of the cylinder, a connecting sleeve disposed on the side of the plate away from the cylinder and coaxially disposed with the cylinder, at least two circumferentially spaced slits on the connecting sleeve, the slits extending from the end of the connecting sleeve away from the plate to the side closer to the plate, a corresponding through hole on the plate, and a clamp for fitting onto the connecting sleeve and a fastener for locking the clamp.

[0013] The present invention also discloses a parallelism calibration method, which is based on the prism calibration device and includes the following steps:

[0014] Step 1: Fix the end of the cylinder corresponding to the incident side of the semi-transparent and semi-reflective surface to the autocollimator to calibrate the prism module of the prism calibration device;

[0015] Step 2: Set the product to be calibrated to correspond with the prism calibration device, so that the component to be calibrated is respectively set to correspond with the prism module, and calibrate the component to be calibrated respectively.

[0016] As an improvement, a self-calibrating reflector is provided below the prism calibration device, so that the plane of the self-calibrating reflector is parallel to the autocollimator, and the prism module is calibrated sequentially from the side closer to the autocollimator to the side farther away from the autocollimator.

[0017] As an improvement, the component to be calibrated is located on one side of the first calibration hole of the prism calibration device, and the component to be calibrated can be calibrated by directly placing the assembled calibration mirror on the component to be calibrated; or, when the component to be calibrated is located on opposite sides of the prism calibration device, the component to be calibrated on one side of the first calibration hole is calibrated first, and then the component to be calibrated on the other side is calibrated.

[0018] Due to the adoption of the above technical solution, the prism calibration device of the present invention includes a cylinder and at least two prism modules spaced apart within the cylinder along the axial direction of the cylinder. Each prism module is provided with a semi-transparent and semi-reflective surface, one side of which is the incident side and the other side is the transmission side. The semi-transparent and semi-reflective surfaces of the at least two prism modules are parallel and have a 45-degree angle between the incident side of the semi-transparent and semi-reflective surface and the axis of the cylinder. A first calibration hole is provided on the side wall of the cylinder corresponding to the incident side of the semi-transparent and semi-reflective surface of each prism module. The parallelism calibration method of the present invention includes the following steps: Step 1: Fix the end of the cylinder corresponding to the incident side of the semi-transparent and semi-reflective surface to an autocollimator to calibrate the prism modules of the prism calibration device. Step 2: Set the product to be calibrated to the prism calibration device so that the component to be calibrated is respectively set to correspond with the prism module and calibrate the component to be calibrated respectively. In use, a self-calibrating mirror is placed below the prism calibration device, with its plane parallel to the autocollimator. The prism module is then calibrated sequentially from the side closest to the autocollimator to the side furthest away. Light emitted from the autocollimator is reflected by the incident side of the semi-transparent, semi-reflective surface of the prism module, passes through the first calibration hole, and illuminates the self-calibrating mirror. The light is then reflected again by the self-calibrating mirror and illuminates the incident side of the semi-transparent, semi-reflective surface of the prism module. After a second reflection, it illuminates the sensor inside the autocollimator, forming a returned image. The prism module is then adjusted based on this returned image to achieve the desired effect. The returned image is located at the center of the sensor inside the autocollimator. After calibration, the semi-transparent and semi-reflective surfaces of at least two prism modules are parallel. Then, the component to be calibrated is set to correspond to the prism calibration device, so that the component to be calibrated is set to correspond to the prism module respectively, and the component to be calibrated is calibrated respectively. Since the parallelism between the semi-transparent and semi-reflective surfaces of at least two prism modules is very high, and the parallelism between the components is calibrated according to the returned image of the autocollimator, the calibration is not only very convenient, but also very accurate. The prism calibration device and parallelism calibration method of the present invention solve the problem of low calibration accuracy of existing parallelism calibration tools. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the prism calibration device according to an embodiment of the present invention;

[0020] Figure 2This is a cross-sectional structural schematic diagram of the prism calibration device according to an embodiment of the present invention;

[0021] Figure 3 This is an exploded structural diagram of the prism calibration device according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the self-calibration structure of the prism calibration device according to an embodiment of the present invention (I);

[0023] Figure 5 This is a schematic diagram (II) of the structure of the prism calibration device for self-calibration according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram (I) of the prism calibration device for calibrating two components according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram (II) of the structure of the prism calibration device for calibrating two components according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the prism calibration device for calibrating four components according to an embodiment of the present invention;

[0027] Among them, 11, cylinder; 12, first calibration hole; 13, second calibration hole; 20, prism module; 21, outer shell; 22, cover plate; 23, beam splitter prism; 231, first right-angle triangular prism; 232, second right-angle triangular prism; 233, semi-transparent and semi-reflective film; 24, first outer shell through hole; 25, second outer shell through hole; 26, third outer shell through hole; 27, cover plate through hole; 30, connecting structure; 31, plate; 32, connecting sleeve; 33, seam; 34, clamp; 35, fastener; 36, plate through hole; 40a, first cover; 40b, second cover; 50, autocollimator; 60a, self-calibrating reflector; 60b, assembled calibration reflector; 70a, first component to be calibrated; 70b, second component to be calibrated; 70c, third component to be calibrated; 70d, fourth component to be calibrated. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Figures 1 to 8 This is a schematic diagram of the structure of the prism calibration device according to an embodiment of the present invention, wherein, Figure 1 A three-dimensional structural schematic diagram of the prism calibration device according to an embodiment of the present invention is shown. Figure 2 A cross-sectional structural schematic diagram of the prism calibration device according to an embodiment of the present invention is shown. Figure 3An exploded view of the prism calibration device according to an embodiment of the present invention is shown. Figure 4 This diagram illustrates the self-calibration structure of the prism calibration device according to an embodiment of the present invention (I). Figure 5 This is a schematic diagram (II) of the self-calibration structure of the prism calibration device according to an embodiment of the present invention. Figure 6 This diagram illustrates the structure (I) of the prism calibration device according to an embodiment of the present invention for calibrating two components. Figure 7 This diagram illustrates the structure (II) of the prism calibration device according to an embodiment of the present invention for calibrating two components. Figure 8 A schematic diagram of the prism calibration device according to an embodiment of the present invention is shown, illustrating the calibration of four components. For ease of explanation, only the parts relevant to the present invention are shown in the figure.

[0030] It should be noted that if the present invention involves directional indications (such as up, down, front, back, left, right, etc.), the directional indications are only used to explain the relative positional relationship between the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. If the present invention involves descriptions such as "first", "second", etc., the descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.

[0031] Depend on Figure 1 , Figure 2 and Figure 3 It is known that the prism calibration device includes a cylinder 11 and at least two prism modules 20 arranged at intervals within the cylinder 11 along the axial direction of the cylinder 11. Each prism module 20 is provided with a semi-transparent and semi-reflective surface. One side of the semi-transparent and semi-reflective surface is the incident side, and the other side of the semi-transparent and semi-reflective surface is the transmission side. The semi-transparent and semi-reflective surfaces of the at least two prism modules 20 are parallel and have a 45-degree angle between the incident side of the semi-transparent and semi-reflective surface and the axial direction of the cylinder 11. A first calibration hole 12 is provided on the side wall of the cylinder 11 corresponding to the incident side of the semi-transparent and semi-reflective surface of each prism module 20.

[0032] For ease of understanding, please refer to Figure 4 , Figure 5 and Figure 6 The principle and use of the prism calibration device are explained as follows:

[0033] In use, the end of the cylinder corresponding to the incident side of the semi-transparent and semi-reflective surface is fixedly connected to the autocollimator 50. A self-calibrating reflector 60a is placed below the prism calibration device, ensuring the plane of the self-calibrating reflector 60a is parallel to the autocollimator 50. Then, the prism module 20 is calibrated sequentially from the side closest to the autocollimator 50 to the side furthest away. Light emitted from the autocollimator 50 is reflected by the incident side of the semi-transparent and semi-reflective surface of the prism module 20, passes through the first calibration hole 12, and illuminates the self-calibrating reflector 60a. The light is then reflected again by the self-calibrating reflector 60a and illuminates the incident side of the semi-transparent and semi-reflective surface of the prism module 20. After being reflected again, it illuminates the sensor inside the autocollimator 50, forming a returned image on the autocollimator 50. The prism module 20 is adjusted according to the returned image so that the returned image is located at the center of the sensor inside the autocollimator 50. Figure 4 and Figure 5 As shown, after calibration, the semi-transparent and semi-reflective surfaces of at least two prism modules 20 are parallel. This embodiment of the invention uses two VR / AR modules (such as...) assembled into a VR / AR product. Figure 6 Hehe Figure 7 Taking the example shown, the first component to be calibrated 70a and the second component to be calibrated 70b (the module mounting fixture for the two VR / AR modules) are respectively located below the two prism modules 20. The assembly calibration mirror 60b is placed on the first component to be calibrated 70a, and the first component to be calibrated 70a is adjusted according to the returned image of the autocollimator 50 until the returned image is located at the center of the sensor within the autocollimator 50. Then the assembly calibration mirror 60b is placed on the second component to be calibrated 70b, and the second component to be calibrated 70b is adjusted according to the returned image of the autocollimator 50 until the returned image is located at the center of the sensor within the autocollimator 50. Since the parallelism between the semi-transparent and semi-reflective surfaces of at least the two prism modules 20 is very high, and the parallelism between the components to be calibrated is calibrated according to the returned image of the autocollimator 50, the calibration is not only very convenient, but also has very high calibration accuracy. The prism calibration device of the present invention solves the problem of low calibration accuracy of existing parallelism calibration tools.

[0034] In this embodiment of the invention, a second calibration hole 13 is provided on the side wall of the cylinder 11 corresponding to the transmissive side of the semi-transparent and semi-reflective surface of each prism module 20. This allows for parallel calibration of the four components. Figure 7 and Figure 8Above the two prism modules 20 of the prism calibration device, a third component 70c and a fourth component 70d (e.g., two camera lenses) are respectively provided. After the first component 70a and the second component 70b are calibrated, the light reflected by the assembly calibration mirror 60b shines on the incident side of the semi-transparent and semi-reflective surface of the prism module 20. Part of the light shines into the autocollimator 50 after being reflected by the incident side of the semi-transparent and semi-reflective surface, and another part of the light shines through the transmission side of the semi-transparent and semi-reflective surface to shine on the camera lens. The camera lens can be adjusted according to the image in the camera lens so that the image of the camera lens is located at its center. In this way, the axis of the camera lens is perpendicular to the assembly calibration mirror 60b, that is, the axis of the camera lens is set in the same direction as the first component 70a / second component 70b, so that four components can be calibrated.

[0035] In this embodiment of the invention, in order to facilitate the protection and dust prevention of the prism module 20, a first cover 40a and a second cover 40b are respectively provided on the first calibration hole 12 and the second calibration hole 13. When in use, the first cover 40a and the second cover 40b are removed, and when not in use, the first cover 40a and the second cover 40b are placed on the first calibration hole 12 and the second calibration hole 13.

[0036] In this embodiment of the invention, the prism module 20 includes a shell 21 forming a cavity, a cover plate 22 covering the cavity opening, and a beam splitter prism 23 disposed between the cover plate 22 and the cavity of the shell 21. A first shell through hole 24 is provided on the shell side wall corresponding to the cover plate 22. A second shell through hole 25 and a third shell through hole 26 are respectively provided on the shell 21 at the positions corresponding to the first calibration hole 12 and the second calibration hole 13. A cover plate through hole 27 is provided on the cover plate 22.

[0037] Typically, the cover plate 22 is positioned on the transmissive side of the semi-transparent, semi-reflective surface.

[0038] Specifically, the beam splitter 23 includes a first right-angled triangular prism 231, a second right-angled triangular prism 232, and a semi-transparent and semi-reflective membrane 233 disposed between the inclined surfaces of the first right-angled triangular prism 231 and the second right-angled triangular prism 232. The semi-transparent and semi-reflective membrane 233 forms a semi-transparent and semi-reflective surface. The first right-angled triangular prism 231, the semi-transparent and semi-reflective membrane 233, and the second right-angled triangular prism 232 are fixedly connected to form a cubic structure. Typically, the semi-transparent and semi-reflective membrane 233 is fixed to the inclined surfaces of the first right-angled triangular prism 231 and the second right-angled triangular prism 232 by optical adhesive.

[0039] In some embodiments, in order to facilitate the fixed connection between the prism calibration device and the autocollimator 50, a connection structure 30 is provided at the end of the cylinder 11 corresponding to the incident side of the semi-transparent and semi-reflective surface, which can quickly and conveniently be fixedly connected to the autocollimator 50.

[0040] Specifically, the connecting structure 30 includes a plate 31 fixedly connected to the end of the cylinder 11, a connecting sleeve 32 disposed on the side of the plate 31 away from the cylinder 11 and coaxially disposed with the cylinder 11, at least two slots 33 spaced apart circumferentially on the connecting sleeve 32, the slots 33 extending from the end of the connecting sleeve 32 away from the plate 31 toward the side closer to the plate 31, a corresponding through hole 36 on the plate 31, and also includes a clamp 34 for fitting onto the connecting sleeve 32 and a fastener 35 for locking the clamp 34, typically a bolt.

[0041] Specifically, there are four seam openings 33. Of course, the number of seam openings 33 can be selected according to the actual situation.

[0042] In order to facilitate the protection of the beam splitter prism 23 and prevent external light from affecting the calibration, a sealing structure is provided at the cover plate through hole 27 of the cover plate 22 of the prism module 20 at the end of the cylinder 11 away from the connecting structure 30, which can prevent light from passing through the cover plate 22.

[0043] Typically, the sealing structure is integrated with the cover plate 22.

[0044] This invention also discloses a parallelism calibration method, which includes the following steps:

[0045] Step 1: Fix the end of the cylinder 11 corresponding to the incident side of the semi-transparent and semi-reflective surface to the autocollimator 50, and calibrate the prism module 20 of the prism calibration device. Usually, the connection structure 30 of the prism calibration device is fixedly connected to the autocollimator 50.

[0046] Specifically, a self-calibrating reflector 60a is set below the prism calibration device, so that the plane of the self-calibrating reflector 60a is parallel to the autocollimator 50, and the prism module 20 is calibrated sequentially from the side closer to the autocollimator 50 to the side farther away from the autocollimator 50. During calibration, the light emitted from the autocollimator 50 is reflected by the incident side of the semi-transparent and semi-reflective surface of the prism module 20 and passes through the first calibration hole 12 to illuminate the self-calibrating mirror 60a. The light is then reflected by the self-calibrating mirror 60a and illuminates the incident side of the semi-transparent and semi-reflective surface of the prism module 20. After being reflected again, the light illuminates the sensor inside the autocollimator 50, forming a return image on the autocollimator 50. Based on the return image, the prism module 20 is adjusted so that the return image is located at the center of the sensor inside the autocollimator 50. In this way, the illumination light path and the return light path are completely coincident, that is, the angle between the semi-transparent and semi-reflective surface of the prism module 20 and the setting direction of the autocollimator 50 is 45 degrees, which can make the semi-transparent and semi-reflective surfaces of at least two prism modules 20 parallel.

[0047] Step 2: Set the prism calibration device corresponding to the product to be calibrated, so that the components to be calibrated are respectively set to correspond to the prism module 20, and calibrate the components to be calibrated respectively.

[0048] Specifically, the assembly calibration mirror 60b is placed on the component to be calibrated, and the component to be calibrated with the assembly calibration mirror 60b is adjusted according to the returned image of the autocollimator 50 until the returned image is located at the center of the sensor inside the autocollimator 50.

[0049] like Figure 6 and Figure 7 As shown, when the component to be calibrated is located on the same side of the prism calibration device, the component to be calibrated can be calibrated by directly placing the assembled calibration mirror 60b on the component to be calibrated. After calibration, the component to be calibrated is fixedly installed, such as two VR / AR modules of a VR / AR product.

[0050] like Figure 8 As shown, when the components to be calibrated are located on opposite sides of the prism calibration device, the component to be calibrated is first calibrated on the side of the first calibration hole 12, and then the component to be calibrated is calibrated on the side of the second calibration hole 13. Since the angle between the transmission side of the semi-transparent and semi-reflective surface and the axis of the cylinder 11 is 135 degrees, the light reflected by the transmission side of the semi-transparent and semi-reflective surface cannot be reflected to the autocollimator 50. The component to be calibrated on the side of the second calibration hole 13 can only be a photosensitive component, such as a camera lens.

[0051] The above description is merely some embodiments of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A prism calibration device, characterized in that, The device includes a cylindrical body and at least two prism modules spaced apart within the cylindrical body along its axial direction. Each prism module has a semi-transparent, semi-reflective surface, with one side of the semi-transparent, semi-reflective surface being the incident side and the other side being the transmission side. The semi-transparent, semi-reflective surfaces of the at least two prism modules are parallel, and a 45-degree angle is formed between the incident side of the semi-transparent, semi-reflective surface and the axial direction of the cylindrical body. A first calibration hole is provided on the cylinder sidewall corresponding to the incident side of the semi-transparent and semi-reflective surface of each prism module, and a second calibration hole is provided on the cylinder sidewall corresponding to the transmission side of the semi-transparent and semi-reflective surface of each prism module. A connecting structure is provided at the end of the cylinder corresponding to the incident side of the semi-transparent and semi-reflective surface; it also includes an autocollimator fixedly connected to the connecting structure. The light emitted by the autocollimator is reflected by the incident side of the semi-transparent and semi-reflective surface of the prism module and passes through the first calibration hole to illuminate the self-calibrating reflector provided below the prism calibration device. The light is reflected by the self-calibrating reflector and then illuminates the incident side of the semi-transparent and semi-reflective surface of the prism module. After being reflected again, it illuminates the autocollimator. The autocollimator forms a return image. The prism module is adjusted according to the return image so that the return image is located at the center of the sensor inside the autocollimator. After calibration, the semi-transparent and semi-reflective surfaces of at least two prism modules are parallel. The prism module includes a shell forming a cavity, a cover plate covering the cavity opening, and a beam splitter prism positioned between the cover plate and the cavity of the shell. A first shell through hole is provided on the shell sidewall corresponding to the cover plate. A second shell through hole and a third shell through hole are provided on the shell at positions corresponding to the first calibration hole and the second calibration hole, respectively. A cover plate through hole is provided on the cover plate.

2. The prism calibration device according to claim 1, characterized in that, A first cover and a second cover are respectively provided on the first calibration hole and the second calibration hole.

3. The prism calibration device according to claim 1, characterized in that, The cover plate is disposed on the transmissive side of the semi-transparent and semi-reflective surface.

4. The prism calibration device according to claim 3, characterized in that, A sealing structure is provided at the through hole of the cover plate of the prism module at the end of the cylinder away from the connecting structure, and the sealing structure is integrated with the cover plate.

5. The prism calibration device according to claim 1, characterized in that, The connecting structure includes a plate fixedly connected to the end of the cylinder, a connecting sleeve disposed on the side of the plate away from the cylinder and coaxially disposed with the cylinder, at least two circumferentially spaced openings on the connecting sleeve, the openings extending from the end of the connecting sleeve away from the plate to the side closer to the plate, a corresponding through hole on the plate, and a clamp for fitting onto the connecting sleeve and a fastener for locking the clamp.

6. A parallelism calibration method, characterized in that, Based on the prism calibration device according to any one of claims 1 to 5, the method includes the following steps: Step 1: Fix the connecting structure at the end of the cylinder corresponding to the incident side of the semi-transparent and semi-reflective surface to the autocollimator, and calibrate the prism module of the prism calibration device. Step 2: Set the product to be calibrated to correspond with the prism calibration device, so that the component to be calibrated is respectively set to correspond with the prism module, and calibrate the component to be calibrated respectively.

7. The parallelism calibration method according to claim 6, characterized in that, A self-calibrating reflector is placed below the prism calibration device, so that the plane of the self-calibrating reflector is parallel to the autocollimator. The prism module is calibrated sequentially from the side closer to the autocollimator to the side farther away from the autocollimator.

8. The parallelism calibration method according to claim 7, characterized in that, The component to be calibrated is located on one side of the first calibration hole of the prism calibration device. The component can be calibrated simply by placing the assembled calibration mirror directly onto it; or... When the components to be calibrated are located on opposite sides of the prism calibration device, the component to be calibrated is first calibrated on one side of the first calibration hole, and then the component to be calibrated is calibrated on the other side.

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