A virtual image distance shortening detection system for a VR projection lens module

Abstract

The application discloses a VR projection lens module virtual image distance compression detection system, which comprises a test box body, an industrial camera and a motion module. The test lens module is arranged on the box body. The test lens module comprises a symmetrical optical system and a distance compression optical system arranged along an optical axis. The light emitted by the measured lens is received by the industrial camera to form an image after passing through the symmetrical optical system and the distance compression optical system. The distance compression optical system or the industrial camera is arranged on the motion module and moves forward and backward along the optical axis by the motion module. After the system is used, AA process technology can be used for production. The distance compression optical system can take an image from the local part of the VR screen, so that the realization of the local combination analysis method is ensured. Moreover, the distance compression optical system or the industrial camera is arranged on the motion module and moves forward and backward along the optical axis by the motion module. The distance between the industrial camera and the distance compression optical system changes, the light path changes, and the change of the simulation distance is realized.

Description

TECHNICAL FIELD

[0001] The application relates to a VR projection lens module detection, in particular to a VR projection lens module virtual image distance shortening detection system. BACKGROUND

[0002] The VR glasses 100 are mainly composed of a VR projection lens and a VR screen, and the VR glasses 100 need to simulate a 0.5-meter-to-infinite object distance range, and the object distance range is large. For the detection of the VR glasses 100, an existing method generally uses an industrial camera and a special lens to form an eye camera 200 at the exit pupil position of the VR glasses 100 to replace the human eye to obtain an image (as shown in Figure 2 The shape of the image on the industrial camera is analyzed through software, mainly based on an MTF data graph, to determine the clarity of the graph, so as to determine whether the position assembly of the VR projection lens and the VR screen meets the requirements. The industrial camera and the special lens must be very close to the VR glasses 100, and the distance is the same as that from the human eye 300 to the VR glasses 100 (as shown in Figure 1 The detection method using the eye camera 300 can only use one camera to detect the entire VR projection image, that is, the image displayed on the VR screen is projected onto the industrial camera through the special lens, and then the clarity of the image projected onto the industrial camera is analyzed through software to determine whether the assembly of the VR projection lens and the VR screen meets the standard. The above detection method has the following disadvantages: because the number of pixels of the entire screen image is huge, but the resolution needs to be ensured, the requirement for the industrial camera is also very high, thereby causing high cost, and when the pixel data is transmitted to the background for analysis, the data transmission time is long due to the large amount of data.

[0003] Therefore, the local combination analysis method is adopted to solve the above problems: that is, a plurality of regions, generally five, are directly selected on the VR screen, and then the image of each region is projected onto the corresponding industrial camera through the corresponding VR projection lens module virtual image distance shortening detection system. The data of the images on the five industrial cameras are collected and the image shape is analyzed through software to determine the clarity of the graph, so as to determine whether the position assembly of the VR projection lens and the VR screen meets the requirements.

[0004] The above method does not need to project the entire screen image, thereby greatly reducing the resolution requirement of each industrial camera, thereby greatly reducing the cost, and even the total price of five cameras is lower than that of one camera before, and the data transmission amount is also small, thereby greatly reducing the data transmission time. The application is proposed for the VR projection lens module virtual image distance shortening detection system. SUMMARY

[0005] To overcome the shortcomings of existing technologies, this invention provides a VR projection lens module virtual image distance reduction detection system.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A VR projection lens module virtual image distance reduction detection system is characterized by comprising a test chamber, an industrial camera, and a motion module. The test lens module is mounted on the test chamber and includes a symmetrical optical system and a reduction optical system arranged along the optical axis. The light emitted by the lens under test is received by the industrial camera after passing through the symmetrical optical system and the reduction optical system to form an image. The reduction optical system or the industrial camera is mounted on the motion module and moves back and forth along the optical axis by the motion module.

[0008] The symmetrical optical system includes lens group one and lens group two. Lens group one includes lens one, lens two, lens three and lens four. Lens group two includes lens five, lens six, lens seven and lens eight. Lens one and lens eight have the same structure and are symmetrically arranged with respect to the virtual plane. Lens two and lens seven have the same structure and are symmetrically arranged with respect to the virtual plane. Lens three and lens six have the same structure and are symmetrically arranged with respect to the virtual plane. Lens four and lens five have the same structure and are symmetrically arranged with respect to the virtual plane. The virtual plane is located at the center between lens group one and lens group two and is perpendicular to the optical axis.

[0009] Lens 1 and Lens 8 are biconcave lenses; Lens 2, Lens 4, Lens 5, and Lens 7 are biconvex lenses; Lens 3 and Lens 6 are convex-concave lenses; Lens 1 is a negative focal lens with equal curvature values ​​on both sides; Lens 2 is a positive focal lens with the side with the smaller radius of curvature facing the lens under test and the side with the larger radius of curvature facing the industrial camera; Lens 3 is a negative focal lens with the convex side facing the lens under test and the concave side facing the industrial camera; Lens 4 is a positive focal lens with the side with the larger radius of curvature facing the lens under test and the side with the smaller radius of curvature facing the industrial camera; Lens 5 is a positive focal lens with the side with the smaller radius of curvature facing the lens under test and the side with the larger radius of curvature facing the industrial camera; Lens 6 is a negative focal lens with the concave side facing the lens under test and the convex side facing the industrial camera; Lens 7 is a positive focal lens with the side with the larger radius of curvature facing the lens under test and the side with the smaller radius of curvature facing the industrial camera; Lens 8 is a negative focal lens with equal curvature values ​​on both sides.

[0010] The lens one refractive index range: 1.55~1.75, dispersion coefficient range: 25~45, surface one curvature radius: -110mm~ -130mm, surface two curvature radius: 110mm~130mm; lens two refractive index range: 1.70~1.90, dispersion coefficient range: 35~55, surface one curvature radius: 50mm~70mm, surface two curvature radius: -80mm~ -100mm; lens three refractive index range: 1.70~1.90; dispersion coefficient range: 35~55, curvature radius: surface one: 40~60, surface two: 30~50; lens four refractive index range: 1.40~1.6; dispersion coefficient range: 70~90, curvature radius: surface one: 70~90, surface two: -40~ -60; lens five refractive index range: 1.40~1.6; dispersion coefficient range: 70~90, curvature radius: surface one: 40~60, surface two: -70~ -90; lens six refractive index range: 1.70~1.90; dispersion coefficient range: 35~55, curvature radius: surface one: -30~ -50, surface two: -40~ -60; lens seven refractive index range: 1.70~1.90, dispersion coefficient range: 35~55, surface one curvature radius: 80mm~100mm, surface two curvature radius: -50mm~ -70mm; lens eight refractive index range: 1.55~1.75, dispersion coefficient range: 25~45, surface one curvature radius: -110mm~ -130mm, surface two curvature radius: 110mm~130mm.

[0011] The lens one focal length: f=-90mm; lens two focal length: f=45mm; lens three focal length: f=-300mm; lens four focal length: f=60mm; lens five focal length: f=60mm; lens six focal length: f=-300mm; lens seven focal length: f=45mm; lens eight focal length: f=-90mm.

[0012] The condensing optical system includes lens nine, lens ten, lens eleven, lens twelve and lens thirteen, the lens eleven is a double concave lens, the lens nine, lens twelve and lens thirteen are double convex lenses, the lens ten is a plano-convex lens, the lens nine is a positive focal length lens and the surface with larger curvature radius value faces the surface with smaller curvature radius value of the measured lens and faces the industrial camera; the lens ten is a positive focal length lens and the convex surface faces the plane of the measured lens and faces the industrial camera; the lens eleven is a negative focal length lens and the surface with larger curvature radius value faces the surface with smaller curvature radius value of the measured lens and faces the industrial camera; the lens twelve is a positive focal length lens and the surface with larger curvature radius value faces the surface with smaller curvature radius value of the measured lens and faces the industrial camera; the lens thirteen is a positive focal length lens and the surface with larger curvature radius value faces the surface with smaller curvature radius value of the measured lens and faces the industrial camera.

[0013] The lens nine refractive index range: 1.60~1.80; dispersion coefficient range: 40~60, curvature radius: surface one: 45~65, surface two: -5~-25; lens ten refractive index range: 1.75~1.95; dispersion coefficient range: 10~30, curvature radius: surface one: 10~30, surface two: plane; lens eleven refractive index range: 1.50~1.70; dispersion coefficient range: 50~70, curvature radius: surface one: -120~-140, surface two: 70~90; lens twelve refractive index range: 1.55~1.75; dispersion coefficient range: 40~60, curvature radius: surface one: 90~110, surface two: -60~-80; lens thirteen refractive index range: 1.40~1.60; dispersion coefficient range: 70~90, curvature radius: surface one: 40~60, surface two: -20~-40.

[0014] The lens nine focal length: f=10mm; lens ten focal length: f=20mm; lens eleven focal length: f=-80mm; lens twelve focal length: f=60mm; lens thirteen focal length: f=40mm.

[0015] The motion module comprises a motor, a screw rod assembly and a guide rail assembly.

[0016] The beneficial effects of the present application are: the present application sets a symmetric optical system between the measured lens and the telecentric optical system, the symmetric optical system mirrors the virtual image of the measured lens to the entrance pupil of the telecentric optical system, the telecentric optical system receives the virtual image from the entrance pupil and images it on the CCD of the industrial camera, thus greatly increasing the distance between the VR glasses and the detection system, thereby solving the problems that the VR glasses or VR lens module detection requires a larger space, a longer distance and is inconvenient to detect; solving the problem that the VR glasses detection needs to be detected at the entrance pupil position, after using the system, AA process technology can be used for production; and the telecentric optical system of the present application can take an image from the local part of the VR screen, thereby ensuring the realization of the local combination analysis method.

[0017] And the telecentric optical system or the industrial camera is arranged on the motion module and moves back and forth along the optical axis by the motion module. The distance between the industrial camera and the telecentric optical system changes, the optical path changes, and the change of the simulated distance is realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings and examples.

[0019] Figure 1 is a schematic diagram of a human eye looking at VR glasses;

[0020] Figure 2 is a schematic diagram of a human eye camera looking at VR glasses;

[0021] Figure 3 is a light path diagram of the present application;

[0022] Figure 4 is a light path diagram of the present application; Figure 3 at A of

[0023] Figure 5 is a light path diagram of the present application; Figure 3 at B of

[0024] Figure 6 is an internal structure diagram of a test case;

[0025] Figure 7 is a lens arrangement diagram;

[0026] Figure 8 is a data diagram of field curvature and distortion;

[0027] Figure 9 is a data diagram of the present system when testing a VR glass MTF . DETAILED DESCRIPTION

[0028] Advantages and features of the present disclosure and methods of accomplishing the same will be described by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Further, the present disclosure is defined only by the scope of the claims.

[0029] The shapes, sizes, ratios, angles, and numbers disclosed in the accompanying drawings for describing embodiments of the present disclosure are merely examples and thus the present disclosure is not limited to the illustrated details. Throughout the specification, like drawing reference numerals refer to like elements. In the following description, detailed descriptions of functions or configurations that are related to known functions or configurations will be omitted when it is determined that such detailed description will unnecessarily obscure the gist of the present disclosure. In the case where "include", "have", and "comprise" are used in the specification, other components can be added unless "only" is used. Unless indicated to the contrary, singular forms can include plural forms.

[0030] In explaining elements, although not explicitly described, the elements are understood to include an error range.

[0031] In describing positional relationships, for example, when the positional relationship is described as "on", "above", "below", and "adjacent to", one or more parts can be arranged between two other parts unless "immediately" or "directly" is used.

[0032] In describing a relationship of time, for example, when a time sequence is described as "after", "subsequently", "next", and "before", unless "just" or "directly" is used, discontinuous cases can be included.

[0033] It should be understood that although the terms "first", "second", etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from other elements. For example, a first element can be called a second element, and similarly, a second element can be called a first element without departing from the scope of the present disclosure.

[0034] As a person skilled in the art can fully understand, the features of different embodiments of the present disclosure can be partially or entirely coupled or combined with each other, and can be cooperated with each other in various ways and technically driven. Embodiments of the present disclosure can be executed independently of each other, or can be executed together in a mutually dependent relationship.

[0035] With reference to Figure 3 and Figure 7 , a VR projection lens module virtual image distance compression detection system is disclosed, which comprises a test box body 1, an industrial camera 2, a motion module (not shown in the figure), a test lens module is arranged on the test box body 1, in order to facilitate integration, the industrial camera 2, the motion module and the test lens module are all installed in the test box body 1, the test lens module comprises a symmetrical optical system 3 and a compression distance optical system 4 arranged along the optical axis, the light emitted by the measured lens is received by the industrial camera 2 after passing through the symmetrical optical system 3 and the compression distance optical system 4 to form an image, the measured lens is a VR glasses, the image position 5 of the virtual image generated by the VR glasses is located on one side of the symmetrical optical system 3, and the VR glasses is located between the image position 5 of the virtual image and the symmetrical optical system 3, the compression distance optical system 4 or the industrial camera 2 is arranged on the motion module and moves forward and backward along the optical axis by the motion module, in this application, the compression distance optical system 4 is connected with the motion module to move, so that the distance between the industrial camera 2 and the compression distance optical system 4 changes, the specific structure is that the symmetrical optical system 3 is arranged at the front end of the large lens barrel, the compression distance optical system 4 is arranged in the small lens barrel, and the end of the small lens barrel is located in the large lens barrel, the motion module is connected with the small lens barrel to drive the small lens barrel to move along the central axis of the large lens barrel, the motion module contains a motor, a screw assembly and a guide rail assembly, so they are all conventional elements in the mechanical field, and the installation structure and motion principle of the motor, the screw assembly and the guide rail assembly are clear to those skilled in the art, which will not be described in detail. By precisely controlling the motion precision, the distance between the industrial camera 2 and the compression distance optical system 4 changes, so that the light path changes to realize the change of the simulated distance, the industrial camera used for testing is special, which is an industrial camera without lens itself.

[0036] As shown in Figure 4 The symmetric optical system 3 includes lens group one and lens group two, the lens group one includes lens one 8, lens two 9, lens three 10 and lens four 11, the lens group two includes lens five 12, lens six 13, lens seven 14 and lens eight 15, the lens one 8 and the lens eight 15 are the same structure and symmetrically arranged relative to the virtual plane; the lens two 9 and the lens seven 14 are the same structure and symmetrically arranged relative to the virtual plane; the lens three 10 and the lens six 13 are the same structure and symmetrically arranged relative to the virtual plane; the lens four 11 and the lens five 12 are the same structure and symmetrically arranged relative to the virtual plane, the virtual plane is located at the center position between the lens group one and the lens group two and is perpendicular to the optical axis, the symmetric optical system 3 mirrors the virtual image of the VR glasses to the entrance pupil 7 of the telecentric optical system 4, thereby increasing the distance between the VR glasses and the detection system.

[0037] As shown in the figure, the lens one 8 and the lens eight 15 are double concave lenses, the lens two 9, the lens four 11, the lens five 12 and the lens seven 14 are double convex lenses, the lens three 10 and the lens six 13 are convex-concave lenses, the lens one 8 is a negative focal length lens and the curvature values of the two surfaces are equal; the lens two 9 is a positive focal length lens and the surface with smaller curvature radius value faces the measured lens with larger curvature radius value and the surface with larger curvature radius value faces the industrial camera 2; the lens three 10 is a negative focal length lens and the convex surface faces the measured lens and the concave surface faces the industrial camera 2; the lens four 11 is a positive focal length lens and the surface with larger curvature radius value faces the measured lens and the surface with smaller curvature radius value faces the industrial camera 2; the lens five 12 is a positive focal length lens and the surface with smaller curvature radius value faces the measured lens and the surface with larger curvature radius value faces the industrial camera 2; the lens six 13 is a negative focal length lens and the concave surface faces the measured lens and the convex surface faces the industrial camera 2; the lens seven 14 is a positive focal length lens and the surface with larger curvature radius value faces the measured lens and the surface with smaller curvature radius value faces the industrial camera 2; the lens eight 15 is a negative focal length lens and the curvature values of the two surfaces are equal.

[0038] The lens one refractive index range: 1.55-1.75, dispersion coefficient range: 25-45, surface one curvature radius: -110mm-130mm, surface two curvature radius: 110mm-130mm; lens two refractive index range: 1.70-1.90, dispersion coefficient range: 35-55, surface one curvature radius: 50mm-70mm, surface two curvature radius: -80mm-100mm; lens three refractive index range: 1.70-1.90; dispersion coefficient range: 35-55, curvature radius: surface one: 40-60, surface two: 30-50; lens four refractive index range: 1.40-1.6; dispersion coefficient range: 70-90, curvature radius: surface one: 70-90, surface two: -40--60; lens five refractive index range: 1.40-1.6; dispersion coefficient range: 70-90, curvature radius: surface one: 40-60, surface two: -70--90; lens six refractive index range: 1.70-1.90; dispersion coefficient range: 35-55, curvature radius: surface one: -30--50, surface two: -40--60; lens seven refractive index range: 1.70-1.90, dispersion coefficient range: 35-55, surface one curvature radius: 80mm-100mm, surface two curvature radius: -50mm-70mm; lens eight refractive index range: 1.55-1.75, dispersion coefficient range: 25-45, surface one curvature radius: -110mm-130mm, surface two curvature radius: 110mm-130mm.

[0039] As specific data:

[0040] The lens one 8 focal length preferably: f=-90mm; lens two 9 focal length preferably: f=45mm; lens three 10 focal length preferably: f=-300mm; lens four 11 focal length preferably: f=60mm; lens five 12 focal length preferably: f=60mm; lens six 13 focal length preferably: f=-300mm; lens seven 14 focal length preferably: f=45mm; lens eight 15 focal length preferably: f=-90mm.

[0041] The lens one 8 refractive index preferably: 1.65; dispersion coefficient preferably: 35; surface one curvature radius preferably: -120mm, surface two curvature radius preferably: 120mm;

[0042] The lens two 9 refractive index preferably: 1.80; dispersion coefficient preferably: 45; surface one curvature radius preferably: 60mm, surface two curvature radius preferably: -90mm;

[0043] The lens three 10 refractive index preferably: 1.80; dispersion coefficient preferably: 45; surface one curvature radius preferably: 50mm, surface two curvature radius preferably: 40mm;

[0044] Lens four 11 refractive index preferably: 1.50; dispersion coefficient preferably: 80; surface one curvature radius preferably: 80mm, surface two curvature radius preferably: -50mm;

[0045] Lens five 12 refractive index preferably: 1.50; dispersion coefficient preferably: 80; surface one curvature radius preferably: 50mm, surface two curvature radius preferably: -80mm;

[0046] Lens six 13 refractive index preferably: 1.80; dispersion coefficient preferably: 45; surface one curvature radius preferably: -40mm, surface two curvature radius preferably: -50mm;

[0047] Lens seven 14 refractive index preferably: 1.80; dispersion coefficient preferably: 45; surface one curvature radius preferably: 90mm, surface two curvature radius preferably: -60mm;

[0048] Lens eight 15 refractive index preferably: 1.65; dispersion coefficient preferably: 35; surface one curvature radius preferably: -120mm, surface two curvature radius preferably: 120mm;

[0049] The above specific lens settings can make the working distance of the symmetrical optical system 3 reach 80mm, that is, the symmetrical optical system 3 has a distance of 80mm from the front entrance pupil position, and the symmetrical optical system mirrors the virtual image of the front entrance pupil position 6 to the entrance pupil 7 of the telecentric optical system, so that the telecentric optical system can receive the virtual image, so the system can realize a working distance of 80mm, and the distance between the front entrance pupil position 6 and the VR glasses is very short, only tens of millimeters, and the human eye camera can only be placed at this position to receive the virtual image of the VR glasses, which is not conducive to the AA process technology.

[0050] As shown in Figure 5 , the telecentric optical system 4 includes lens nine 16, lens ten 17, lens eleven 18, lens twelve 19 and lens thirteen 20, the lens eleven 18 is a double concave lens, the lens nine 16, lens twelve 19 and lens thirteen 20 are double convex lenses, the lens ten 17 is a plano-convex lens, the lens nine 16 is a positive focal length lens and the surface with a larger curvature radius value faces the surface with a smaller curvature radius value of the measured lens towards the industrial camera 2; the lens ten 17 is a positive focal length lens and the convex surface faces the plane of the measured lens towards the industrial camera 2; the lens eleven 18 is a negative focal length lens and the surface with a larger curvature radius value faces the surface with a smaller curvature radius value of the measured lens towards the industrial camera 2; the lens twelve 19 is a positive focal length lens and the surface with a larger curvature radius value faces the surface with a smaller curvature radius value of the measured lens towards the industrial camera 2; the lens thirteen 20 is a positive focal length lens and the surface with a larger curvature radius value faces the surface with a smaller curvature radius value of the measured lens towards the industrial camera 2.

[0051] The lens nine 16 has a refractive index range of 1.60-1.80 and a dispersion coefficient range of 40-60, and a curvature radius of face one: 45-65, and face two: -5--25; the lens ten 17 has a refractive index range of 1.75-1.95 and a dispersion coefficient range of 10-30, and a curvature radius of face one: 10-30, and face two: plane; the lens eleven 18 has a refractive index range of 1.50-1.70 and a dispersion coefficient range of 50-70, and a curvature radius of face one: -120--140, and face two: 70-90; the lens twelve 19 has a refractive index range of 1.55-1.75 and a dispersion coefficient range of 40-60, and a curvature radius of face one: 90-110, and face two: -60--80; the lens thirteen 20 has a refractive index range of 1.40-1.60 and a dispersion coefficient range of 70-90, and a curvature radius of face one: 40-60, and face two: -20--40.

[0052] As specific data:

[0053] The lens nine 16 has a focal length of preferably f=10mm; the lens ten 17 has a focal length of preferably f=20mm; the lens eleven 18 has a focal length of preferably f=-80mm; the lens twelve 19 has a focal length of preferably f=60mm; and the lens thirteen 20 has a focal length of preferably f=40mm.

[0054] The lens nine 16 has a refractive index of preferably 1.70, a dispersion coefficient of preferably 50, a curvature radius of face one of preferably 55mm, and a curvature radius of face two of preferably -15mm;

[0055] The lens ten 17 has a refractive index of preferably 1.85, a dispersion coefficient of preferably 20, and a curvature radius of face one of preferably 20mm;

[0056] The lens eleven 18 has a refractive index of preferably 1.60, a dispersion coefficient of preferably 60, a curvature radius of face one of preferably -130mm, and a curvature radius of face two of preferably 80mm;

[0057] The lens twelve 19 has a refractive index of preferably 1.65, a dispersion coefficient of preferably 50, a curvature radius of face one of preferably 100mm, and a curvature radius of face two of preferably -70mm;

[0058] The lens thirteen 20 has a refractive index of preferably 1.50, a dispersion coefficient of preferably 80, a curvature radius of face one of preferably 50mm, and a curvature radius of face two of preferably -30mm;

[0059] In the above, face one indicates Figure 3 the left side surface of each lens, and face two indicates Figure 3 the right side surface of each lens.

[0060] As Figure 8 and 9As shown, through the setting of the above specific lens, the distortion and field curvature of the test lens module of the present application are very small, and the field angle of the close-up optical system 4 of the present application is very small within ten degrees, preferably nine degrees, while the field angle of the previous special lens is very large, so the close-up optical system 4 of the present application is designed separately to adapt to the implementation of the local combination analysis method, and directly receives the local image through the small field angle and then projects it onto the industrial camera 2.

[0061] The above describes in detail a VR projection lens module virtual image distance close-up detection system provided by the embodiment of the present application, and the principles and implementation manners of the present application are described by applying specific examples; the above embodiment description is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A VR projection lens module virtual image distance compression detection system, characterized in that: The utility model provides a kind of test device, including test box, industrial camera, motion module, the box is equipped with test lens module, the test lens module includes symmetric optical system and shortening optical system along optical axis, the light emitted by measured lens is received after symmetric optical system, shortening optical system by industrial camera and forms image, the shortening optical system or industrial camera is arranged on motion module, and it is moved along optical axis by motion module drive and before and after, the symmetric optical system includes lens group one and lens group two, the lens group one includes lens one, lens two, lens three and lens four, the lens group two includes lens five, lens six, lens seven and lens eight, the lens one and lens eight structure are identical and symmetrically arranged relative to virtual plane;The lens two and lens seven structure are identical and symmetrically arranged relative to virtual plane;The lens three and lens six structure are identical and symmetrically arranged relative to virtual plane;The lens four and lens five structure are identical and symmetrically arranged relative to virtual plane, the virtual plane is located in the center position between lens group one and lens group two and with optical axis vertical, the lens one, lens eight is double-concave lens, the lens two, lens four, lens five, lens seven is double-convex lens, the lens three, lens six is convex-concave lens, the lens one is negative focus lens and two curvature values are equal;The lens two is positive focus lens and the curvature radius value of small side faces towards measured lens curvature radius value of big side faces towards industrial camera; The lens three is negative focus lens and convex side faces towards measured lens concave side faces towards industrial camera;The lens four is positive focus lens and the curvature radius value of big side faces towards measured lens curvature radius value of small side faces towards industrial camera;The lens five is positive focus lens and the curvature radius value of small side faces towards measured lens curvature radius value of big side faces towards industrial camera;The lens six is negative focus lens and concave side faces towards measured lens convex side faces towards industrial camera;The lens seven is positive focus lens and the curvature radius value of big side faces towards measured lens curvature radius value of small side faces towards industrial camera;The lens eight is negative focus lens and two curvature values are equal.

2. The VR projection lens module virtual image distance shrinkage detection system according to claim 1, characterized in that: The lens one refractive index range: 1.55~1.75, dispersion coefficient range: 25~45, surface one curvature radius: -110mm~ -130mm, surface two curvature radius: 110mm~130mm; lens two refractive index range: 1.70~1.90, dispersion coefficient range: 35~55, surface one curvature radius: 50mm~70mm, surface two curvature radius: -80mm~ -100mm; lens three refractive index range: 1.70~1.90; dispersion coefficient range: 35~55, curvature radius: surface one: 40~60, surface two: 30~50; lens four refractive index range: 1.40~1.6; dispersion coefficient range: 70~90, curvature radius: surface one: 70~90, surface two: -40~ -60; lens five refractive index range: 1.40~1.6; dispersion coefficient range: 70~90, curvature radius: surface one: 40~60, surface two: -70~ -90; lens six refractive index range: 1.70~1.90; dispersion coefficient range: 35~55, curvature radius: surface one: -30~ -50, surface two: -40~ -60; lens seven refractive index range: 1.70~1.90, dispersion coefficient range: 35~55, surface one curvature radius: 80mm~100mm, surface two curvature radius: -50mm~ -70mm; lens eight refractive index range: 1.55~1.75, dispersion coefficient range: 25~45, surface one curvature radius: -110mm~ -130mm, surface two curvature radius: 110mm~130mm. 3.The VR projection lens module virtual image distance detection system of claim 1, wherein: The lens one focal length: f=-90mm; lens two focal length: f=45mm; lens three focal length: f=-300mm; lens four focal length: f=60mm; lens five focal length: f=60mm; lens six focal length: f=-300mm; lens seven focal length: f=45mm; lens eight focal length: f=-90mm.

4. The virtual image distance and magnification detection system of claim 1, wherein: The short-distance optical system includes lens nine, lens ten, lens eleven, lens twelve and lens thirteen, the lens eleven is a double concave lens, the lens nine, lens twelve and lens thirteen are double convex lenses, the lens ten is a plano-convex lens, the lens nine is a positive focal length lens and the surface with larger curvature radius value faces the measured lens and the surface with smaller curvature radius value faces the industrial camera; the lens ten is a positive focal length lens and the convex surface faces the measured lens and the flat surface faces the industrial camera; the lens eleven is a negative focal length lens and the surface with larger curvature radius value faces the measured lens and the surface with smaller curvature radius value faces the industrial camera; the lens twelve is a positive focal length lens and the surface with larger curvature radius value faces the measured lens and the surface with smaller curvature radius value faces the industrial camera; the lens thirteen is a positive focal length lens and the surface with larger curvature radius value faces the measured lens and the surface with smaller curvature radius value faces the industrial camera.

5. The virtual image distance and magnification detection system of claim 4, wherein: The lens nine refractive index range: 1.60~1.80; dispersion coefficient range: 40~60, radius of curvature: surface one: 45~65, surface two: -5~-25; lens ten refractive index range: 1.75~1.95; dispersion coefficient range: 10~30, radius of curvature: surface one: 10~30, surface two: plane; lens eleven refractive index range: 1.50~1.70; dispersion coefficient range: 50~70, radius of curvature: surface one: -120~-140, surface two: 70~90; lens twelve refractive index range: 1.55~1.75; dispersion coefficient range: 40~60, radius of curvature: surface one: 90~110, surface two: -60~-80; lens thirteen refractive index range: 1.40~1.60; dispersion coefficient range: 70~90, radius of curvature: surface one: 40~60, surface two: -20~-40.

6. The virtual image distance and magnification detection system of claim 4, wherein: The lens nine focal length: f=10mm; lens ten focal length: f=20mm; lens eleven focal length: f=-80mm; lens twelve focal length: f=60mm; lens thirteen focal length: f=40mm. 7.The VR projection lens module virtual image distance detection system of claim 1, wherein: The motion module comprises a motor, a screw rod assembly and a guide rail assembly.

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