A lens zoom stroke testing device and testing method

Abstract

The present invention relates to the technical field of security equipment, and discloses a testing device and a testing method for lens zoom stroke. The lens to be tested includes an adjustment ring, an inner wall of which is provided with an oblique groove, and the adjustment ring also includes a screw hole that radially penetrates the peripheral wall. The testing device for lens zoom stroke includes a center column and a guide column. The center column can be coaxially inserted into the adjustment ring, and a support groove is provided on an end face of one end of the center column. The guide column is placed in the support groove along the radial direction of the center column, and one end of the guide column protrudes from the circumferential side wall of the center column for cooperating with the oblique groove. The present invention shortens the test time, improves the test efficiency, improves the test accuracy, and improves the accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of security equipment, and in particular to a testing device and a testing method for a lens zoom stroke. Background Art

[0002] With the rapid development of society, security issues have become the focus of the entire society today, and security cameras are everywhere. People's requirements for monitoring have gradually evolved from simply displaying images in the early days to being able to zoom in, so the structural design of security lenses requires that the zoom range of the lens frame inside the lens can meet the needs.

[0003] A zoom lens known in the prior art includes a first lens assembly and a second lens assembly that are coaxial and spaced apart from each other. The first lens assembly is fixed in the lens, and a lens is fixed in the first lens assembly. Figure 1-2 As shown in the figure, a second lens assembly known in the prior art is shown. The second lens assembly comprises a coaxially arranged adjustment ring 10, a main barrel 20 and a lens frame 30, wherein a lens is coaxially fixed in the lens frame 30. The inner wall of the main barrel 20 is sleeved outside the lens frame 30, and the adjustment ring 10 is sleeved outside the main barrel 20. The adjustment ring 10, the main barrel 20 and the lens frame 30 can rotate relative to each other. A retaining ring for abutting against the adjustment ring 10 is provided at one end of the main barrel 20, and the other end of the main barrel 20 protrudes from the adjustment ring 10. Figure 3 As shown, the inner wall of the adjustment ring 10 is provided with three inclined grooves 101, and the three inclined grooves 101 are evenly distributed along the inner wall of the adjustment ring 10 in the circumferential direction. The axis X is parallel to the axis of the adjustment ring 10, and the angle between the inclined groove 101 and the axis X is θ. Figure 1-3 As shown, the adjusting ring 10 is also provided with a radially arranged screw hole 102, and the screw hole 102 passes through the peripheral wall of the adjusting ring 10. Figure 4 As shown, three first guide grooves 201 are provided on the wall of the main cylinder 20. The first guide grooves 201 penetrate the peripheral wall of the main cylinder 20. The first guide grooves 201 are arranged along the axial direction of the main cylinder 20, and the three first guide grooves 201 are evenly distributed along the circumferential direction along the inner wall of the main cylinder 20. A second guide groove 202 is also provided on the outer wall of the main cylinder 20. The second guide groove 202 extends along the circumferential surface. The screw passes through the screw hole 102 of the adjustment ring 10 and abuts against the bottom surface of the second guide groove 202. When the adjustment ring 10 is rotated, the screw can slide in the second guide groove 202. Figure 5As shown, the outer wall of the lens frame 30 is provided with a protrusion 301, which passes through the first guide groove 201 and the end of which abuts against the bottom surface of the inclined groove 101. One end of the inclined groove 101 extends to one end of the adjustment ring 10 and passes through the end surface of the adjustment ring 10 to form an opening 1012, and the other end of the inclined groove 101 is a blind end 1011. The protrusion 301 can enter the inclined groove 101 from the opening 1012, and the side wall of the protrusion 301 can eventually abut against the blind end 1011. When the adjustment ring 10 is rotated, the lens frame 30 inside the main tube 20 moves linearly along the axial direction of the main tube 20 due to the limitation of the first guide groove 201, and the adjustment ring 10 only rotates around its own axis due to the limitation of the second guide groove 202, and does not move linearly. When the protrusion 301 moves along the inclined groove 101 and from the opening 1012 to the blind end 1011, the lens of the second lens assembly approaches or moves away from the lens of the first lens assembly to achieve a zooming effect. The distance the frame 30 moves is called the zoom stroke of the lens.

[0004] Currently, if Figure 6 As shown, the method for testing whether the zoom stroke of the lens is qualified is to first assemble the second lens assembly of the lens, insert the part of the main barrel 20 protruding from the adjustment ring 10 into the ring gauge 40, adjust the position of the adjustment ring 10 so that the protrusion 301 is at the opening 1012, and record the position of one end face of the frame 30 at this time as the initial position. Rotate the adjustment ring 10 until the protrusion 301 abuts against the blind end 1011, record the position of the above end face of the frame 30 at this time as the final position, calculate the distance that the frame 30 moves along the axial direction between the initial position and the final position, which is the zoom stroke, and then compare the zoom stroke with the qualified zoom stroke range to check whether the zoom stroke of this lens is qualified. This test method requires the second lens assembly of the lens to be installed before testing, which takes a long time to test and is inefficient. In addition, there are many parts, which can easily cause the superposition of various errors, resulting in a decrease in test accuracy and a reduction in the reliability of the test results, thereby failing to guarantee the functionality of the security camera.

[0005] Based on this, a lens zoom stroke testing device and a testing method are urgently needed to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a testing device for lens zoom stroke, which shortens the testing time, improves the testing efficiency, improves the testing precision, and improves the accuracy of the testing results.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A testing device for lens zoom stroke, wherein the lens to be tested comprises an adjustment ring, an inner wall of the adjustment ring is provided with an oblique groove, and the adjustment ring further comprises a screw hole penetrating the peripheral wall in a radial direction, and the testing device comprises:

[0009] A center column can be coaxially inserted into the adjustment ring, and a radially extending support groove is formed on an end surface of one end of the center column;

[0010] A guide post is placed in the support groove along the radial direction of the center post, and the end of the guide post protrudes from the circumferential side wall of the center post for matching with the inclined groove.

[0011] Preferably, a ring platform is convexly provided on the end surface of one end of the center column, the axis of the ring platform coincides with the axis of the center column, and the outer circular surface of the ring platform coincides with the circumferential side wall of the center column, and the support groove is arranged on the end surface of the ring platform, and the support groove passes through the ring platform.

[0012] Preferably, a central support truncated cone is protruding from the end surface of the central column on which the annular table is arranged. The central support truncated cone is coaxial with the annular table and is arranged at intervals. The other end of the guide column abuts against the side wall of the central support truncated cone.

[0013] Preferably, a clamping groove is provided on the side wall of the central supporting truncated cone, the bottom surface of the clamping groove is arranged parallel to the axis of the central column, and the end of the guide column abuts against the bottom surface of the clamping groove.

[0014] Preferably, the other end of the central column is connected to a base.

[0015] Preferably, the distance between the axis of the guide column and the base is greater than the axial height of the adjustment ring.

[0016] Preferably, the lens zoom stroke testing device further comprises a verification post, wherein the verification post is used to be inserted into the screw hole arranged along the radial direction of the adjustment ring, and the axis of the verification post is colinear with the axis of the screw hole.

[0017] Preferably, the guide posts and the support grooves are uniformly distributed in plurality along the circumference of the center post, and the number of the guide posts and the support grooves is the same as the number of the inclined grooves of the adjustment ring, and the plurality of guide posts are respectively arranged in a plurality of corresponding support grooves.

[0018] Another object of the present invention is to provide a method for testing the zoom stroke of a lens, which shortens the testing time, improves the testing efficiency, improves the testing precision, and improves the accuracy of the testing results.

[0019] To achieve this object, the present invention adopts the following technical solutions:

[0020] A testing method using the lens zoom stroke testing device as described above comprises the following steps:

[0021] S1. Installation: Coaxially sleeve the adjustment ring on the center column, and rotate the adjustment ring so that the end of the guide column enters the inclined groove from the opening of the inclined groove and moves to the blind end of the inclined groove;

[0022] S2. Measurement: measuring the angle β between the axis of the guide post and the axis of the screw hole of the adjustment ring;

[0023] S3, verification: comparing the included angle β with a preset angle range. If the included angle β is within the preset angle range, the zoom stroke of the lens to be tested is qualified.

[0024] Preferably, the step S2 specifically includes:

[0025] S21, inserting a check column into the screw hole of the adjustment ring;

[0026] S22, measuring the angle between the axis of the guide column and the axis of the verification column as the angle β.

[0027] Beneficial effects of the present invention:

[0028] An embodiment of the present invention provides a testing device for the zoom stroke of a lens. During testing, the adjustment ring is rotated and sleeved on the center column until the guide column abuts against the blind end of the bevel groove, and the test is completed. During measurement, only one part, the adjustment ring, is required to complete the test, which saves the time of assembling parts and simplifies the test operation, thereby shortening the test time and improving the test efficiency. In addition, the number of parts required for the test is reduced, error accumulation is avoided, the accuracy of the test is improved, and the accuracy of the test results is improved. The center column and the adjustment ring are coaxially installed, which can simplify the test process and improve the accuracy of the test results. The guide column is fixed to the center column to avoid the movement of the guide column when the adjustment ring is installed, further improving the accuracy of the test. The provision of a support groove can shorten the axial dimension of the test device, improve the compactness of the structure, and reduce the space occupied.

[0029] The embodiment of the present invention provides a method for testing the zoom stroke of a lens. Generally, when processing the adjustment circle, the angle θ between the inclined groove and the axis X is fixed, and the distance of the lens frame moving along the axial direction between the initial position and the final position of the lens frame is the distance between the opening of the inclined groove and the blind end along the axial direction. The angle between the line connecting the blind end and the adjustment circle center and the screw hole axis is β. The angle β has a one-to-one correspondence with the distance between the opening of the inclined groove and the blind end along the axial direction. When the angle θ between the inclined groove and the axis X is fixed, the preset angle range of the angle β can be calculated according to the preset qualified inclined groove distance range along the axial direction, and the actual inclined groove distance along the axial direction, i.e., the zoom stroke, can be judged according to the angle β value obtained by actual measurement, and compared with the above-mentioned preset angle range, whether the zoom stroke is qualified. In the testing process of this testing method, the operation is simple, the testing efficiency is improved, and the time cost is saved. Moreover, the time for assembling components is saved, the testing operation is simplified, thereby shortening the testing time and improving the testing efficiency. In addition, the number of parts required for the test is reduced, error accumulation is avoided, the accuracy of the test is improved, and the accuracy of the test results is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of a second lens assembly in the prior art;

[0031] Figure 2 is a cross-sectional view of a second lens assembly in the prior art;

[0032] Figure 3 It is a cross-sectional view of the adjustment ring in the prior art;

[0033] Figure 4 It is a structural schematic diagram of the main cylinder in the prior art;

[0034] Figure 5 It is a structural schematic diagram of a mirror frame in the prior art;

[0035] Figure 6 It is a structural schematic diagram of a method for testing the zoom stroke of a lens in the prior art;

[0036] Figure 7 It is a structural schematic diagram of a lens zoom stroke testing device provided by an embodiment of the present invention;

[0037] Figure 8 It is a structural schematic diagram of a first viewing angle of a method for testing a lens zoom stroke provided by an embodiment of the present invention;

[0038] Fig. 9 It is a flowchart of the main steps of the method for testing the zoom range of a lens provided by an embodiment of the present invention;

[0039] Fig.10It is a structural schematic diagram of a second viewing angle of a method for testing a lens zoom stroke provided by an embodiment of the present invention;

[0040] Fig.11 It is a detailed step flow chart of a method for testing the zoom stroke of a lens provided in an embodiment of the present invention.

[0041] In the figure:

[0042] 10, adjustment ring; 101, inclined groove; 1011, blind end; 1012, opening; 102, screw hole;

[0043] 20, main cylinder; 201, first guide groove; 202, second guide groove;

[0044] 30, frame; 301, bulge;

[0045] 40. Ring gauge;

[0046] 1. Center column; 11. Center support truncated table; 111. Snap-in groove; 12. Ring table; 121. Support groove;

[0047] 2. Guide pillar;

[0048] 3. Base;

[0049] 4. Check the column. DETAILED DESCRIPTION

[0050] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0054] At present, the test method of lens zoom range requires the second lens assembly of the lens to be installed before testing, which takes a long time and is inefficient. In addition, there are many parts, which easily cause the superposition of various errors, resulting in a decrease in test accuracy and the reliability of test results, thus failing to guarantee the functionality of the security camera.

[0055] In order to solve the above problems, the present embodiment provides a lens zoom stroke testing device, which shortens the testing time, improves the testing efficiency, improves the testing precision, and improves the accuracy of the testing results.

[0056] Specifically, Figure 1-7As shown, the lens to be tested includes an adjustment ring 10, an inner wall of which is provided with an oblique groove 101, and the adjustment ring 10 also includes a screw hole 102 that radially penetrates the peripheral wall. A test device for lens zoom stroke includes a center column 1 and a guide column 2. The center column 1 can be coaxially arranged in the adjustment ring 10. A radially extending support groove 121 is arranged on the end surface of one end of the center column 1, and the guide column 2 is placed in the support groove 121 along the radial direction of the center column 1, and one end of the guide column 2 protrudes from the circumferential side wall of the center column 1, and the guide column 2 is used to cooperate with the oblique groove 101. The end surface of the guide column 2 can abut against the bottom surface of the oblique groove 101 of the adjustment ring 10, and the guide column 2 can slide from the opening 1012 to the blind end 1011 along the oblique groove 101. During the test, the adjustment ring 10 is rotated and sleeved on the center column 1 until the guide column 2 abuts against the blind end 1011 of the oblique groove 101, and the test can be completed. During measurement, only one part, the adjustment ring 10, is needed to complete the test, which saves the time of assembling parts and simplifies the test operation, thereby shortening the test time and improving the test efficiency. In addition, the number of parts required for the test is reduced, error accumulation is avoided, the accuracy of the test is improved, and the accuracy of the test results is improved. The center column 1 is coaxially installed with the adjustment ring 10, which can simplify the test process and improve the accuracy of the test results. The guide column 2 is fixed to the center column 1 to avoid the movement of the guide column 2 when the adjustment ring 10 is installed, further improving the accuracy of the test. The support groove 121 is provided to shorten the axial dimension of the test device, improve the compactness of the structure, and reduce the space occupied.

[0057] In this embodiment, for ease of assembly, the width of the support groove 121 is the same as the width of the guide column 2. The guide column 2 and the support groove 121 are fixedly bonded by glue.

[0058] In this embodiment, when the adjustment ring 10 is sleeved on the center column 1, the center column 1 and the adjustment ring 10 have an interference fit, and it is also necessary to ensure that the adjustment ring 10 can be smoothly removed from the center column 1 after the test is completed.

[0059] Preferably, multiple guide columns 2 and support grooves 121 are evenly distributed along the circumference of the center column 1, and the number of guide columns 2 and support grooves 121 is the same as the number of inclined grooves 101 of the adjustment ring 10. Multiple guide columns 2 are respectively arranged in multiple corresponding support grooves 121, so that during testing, a guide column 2 is arranged in each inclined groove 101 for abutment, ensuring that each inclined groove 101 can be tested, thereby improving the credibility of the test results.

[0060] In this embodiment, since there are three inclined grooves 101 on the tested adjustment ring 10, there are three guide pillars 2 and three support grooves 121, and the three guide pillars 2 and the support grooves 121 are evenly distributed along the same circumferential direction, that is, the angle between two adjacent guide pillars 2 is 120°, and the angle between two adjacent support grooves 121 is 120°.

[0061] Preferably, a ring platform 12 is convexly provided on the end surface of one end of the center column 1, the axis of the ring platform 12 coincides with the axis of the center column 1, and the outer cylindrical surface of the ring platform 12 coincides with the circumferential side wall of the center column 1, and a support groove 121 is provided on the end surface of the ring platform 12, and the support groove 121 passes through the ring platform 12, that is, the two ends of the support groove 121 are connected to the outer cylindrical surface and the inner cylindrical surface respectively. The guide column 2 is fixed in the support groove 121 on the ring platform 12, which can reduce the contact area between the guide column 2 and the center column 1, reduce the processing requirements of the center column 1, reduce the cost, and also improve the accuracy of the placement of the guide column 2, improve the accuracy of the test, and improve the accuracy of the test results.

[0062] Preferably, a central support truncated cone 11 is convexly provided on the end surface of the central column 1 on which the annular cone 12 is provided, and the central support truncated cone 11 is coaxial with the annular cone 12 and spaced apart, and the other end of the guide column 2 abuts against the side wall of the central support truncated cone 11. The guide column 2 abuts against the central support truncated cone 11, which improves the position accuracy of the guide column 2, and also ensures that when the adjustment ring 10 is installed, the axis of the guide column 2 always coincides with the radial direction of the adjustment ring 10, and also avoids the movement of the guide column 2, thereby improving the precision and accuracy of the test.

[0063] Preferably, a snap-in groove 111 is provided on the side wall of the central supporting truncated table 11 , the bottom surface of the snap-in groove 111 is arranged parallel to the axis of the central column 1 , and the end of the guide column 2 abuts against the bottom surface of the snap-in groove 111 , thereby improving the stability of the placement of the guide column 2 .

[0064] In this embodiment, three engaging grooves 111 are provided corresponding to the number and position of the guide pillars 2. The end surface of the guide pillar 2 is a plane, so the bottom surface of the engaging groove 111 that contacts the end surface of the guide pillar 2 is also a plane, further increasing the contact area and ensuring the stability of the abutment.

[0065] In other embodiments, the end surface of the guide pillar 2 may also be hemispherical, and in this case, the engaging groove 111 is a conical groove.

[0066] Preferably, one end of the center column 1 away from the ring platform 12 is connected to the base 3, that is, the other end of the center column 1 is connected to the base 3, which improves the placement stability of the lens zoom stroke test device and improves the test precision and accuracy.

[0067] Preferably, the distance between the axis of the guide column 2 and the base 3 is greater than the axial height of the adjustment ring 10, ensuring that when the adjustment ring 10 is installed on the test device, the guide column 2 can contact the blind end 1011 of the inclined groove 101, thereby ensuring the precision and accuracy of the test.

[0068] Preferably, if Figure 8As shown, the testing device for the lens zoom stroke also includes a verification column 4, which is used to be inserted into a screw hole 102 radially arranged along the adjustment ring 10, and the axis of the verification column 4 is colinear with the axis of the screw hole 102. The verification column 4 is coaxial with the screw hole 102, which simplifies the test operation and improves the accuracy of the test.

[0069] This embodiment also provides a testing method using the above-mentioned lens zoom stroke testing device, such as Figure 9-10 As shown,. Fig. 9 The main steps of the test method for lens zoom travel include:

[0070] S1. Installation: Coaxially sleeve the adjusting ring 10 on the central column 1, and rotate the adjusting ring 10 to allow the end of the guide column 2 to enter the inclined groove 101 from the opening 1012 of the inclined groove 101 and move to the blind end 1011 of the inclined groove 101.

[0071] S2. Measurement: Measure the angle β between the axis of the guide post 2 and the axis of the screw hole 102 of the adjustment ring 10.

[0072] S3, verification: compare the included angle β with the preset angle range. If the included angle β is within the preset angle range, the zoom stroke of the lens is qualified.

[0073] If the included angle β is within the preset angle range, the focusing stroke of the adjustment ring 10 is qualified; if the included angle β is not within the preset angle range, the focusing stroke of the adjustment ring 10 is unqualified.

[0074] Generally, when processing the adjustment ring 10, the angle θ between the inclined groove 101 and the axis X is fixed, and the distance of the lens frame 30 moving along the axial direction between the initial position and the final position of the lens frame 30 is the distance between the opening 1012 of the inclined groove 101 and the blind end 1011 along the axial direction. The angle between the line connecting the blind end 1011 and the center of the adjustment ring 10 and the axis of the screw hole 102 is β. The angle β has a one-to-one correspondence with the distance between the opening 1012 of the inclined groove 101 and the blind end 1011 along the axial direction, that is, each time the axial distance of an inclined groove 101 is determined, an angle β can be determined. When the angle θ between the inclined groove 101 and the axis X is fixed, the preset angle range of the angle β can be calculated according to the preset range of the distance of the qualified inclined groove 101 along the axial direction. According to the angle β actually measured, by comparing it with the above preset angle range, it can be judged whether the distance of the inclined groove 101 along the axial direction, that is, the zoom stroke, is qualified. In the testing process of this test method, the operation is simple, the test efficiency is improved, and the time cost is saved. Moreover, the time for assembling components is saved, the test operation is simplified, thereby shortening the test time and improving the test efficiency. In addition, the number of parts required for the test is reduced, error accumulation is avoided, the test accuracy is improved, and the accuracy of the test results is improved.

[0075] Fig.11 This is a detailed flow chart of the lens zoom travel test method, combined with Figure 10-11 The following is a detailed description of the lens zoom travel test method, which includes the following steps:

[0076] S1. Installation: Coaxially sleeve the adjusting ring 10 on the central column 1, and rotate the adjusting ring 10 to allow the end of the guide column 2 to enter the inclined groove 101 from the opening 1012 of the inclined groove 101 and move to the blind end 1011 of the inclined groove 101.

[0077] Furthermore, before step S1 , the test device should be placed on a flat horizontal surface, specifically, a surface of the base 3 away from the central column 1 should be in contact with the surface.

[0078] S2. Measurement: The angle between the axis of the guide column 2 and the axis of the screw hole 102 of the adjustment ring 10 is measured as angle β.

[0079] Specifically, the axis of the guide post 2 and the axis of the screw hole 102 are projected onto the horizontal plane. The adjustment ring 10 is then projected onto the horizontal plane to obtain the center O. Since the axis of the guide post 2 and the axis of the screw hole 102 are both along the radial direction of the adjustment ring 10, the projection line of the axis of the guide post 2 and the projection line of the axis of the screw hole 102 intersect at the center O, and the angle between the two projection lines is β.

[0080] Furthermore, step S2 specifically includes:

[0081] S21, inserting the verification column 4 into the screw hole 102 of the adjustment ring 10.

[0082] By using the calibration column 4 arranged along the axial direction of the screw hole 102, the axis of the screw hole 102 can be materialized, which is convenient for measurement and calculation.

[0083] S22, measuring the angle between the axis of the guide column 2 and the axis of the verification column 4 as angle β.

[0084] Specifically, the axis of the guide post 2 and the axis of the inspection post 4 are projected onto the horizontal plane. The adjustment ring 10 is then projected onto the horizontal plane to obtain the center O. Since the axis of the guide post 2 and the axis of the screw hole 102 are both along the radial direction of the adjustment ring 10, and the axis of the inspection post 4 is colinear with the axis of the screw hole 102, the projection line of the axis of the guide post 2 and the projection line of the axis of the inspection post 4 intersect at the center O, and the angle between the two projection lines is β.

[0085] Furthermore, after projecting the axis of the guide column 2 and the axis of the check column 4 onto the horizontal plane, the midpoint of the projection line of the axis of the guide column 2 is taken as A, the midline of the projection line of the axis of the check column 4 is taken as B, and the angle between the line segment OA and the line segment OB is β. Using the line between the two points instead of the projection line of the two axes can avoid the influence of the placement accuracy of the guide column 2 and the check column 4 on the test results, avoid error accumulation, improve the test accuracy, and improve the accuracy of the test results.

[0086] In this embodiment, the selected position of point A should be close to the ring stage 12, and the selected position of point B should be close to the adjustment ring 10, which can further improve the test accuracy.

[0087] S3, verification: compare the included angle β with the preset angle range. If the included angle β is within the preset angle range, the zoom stroke of the lens is qualified.

[0088] In this embodiment, the angle between every two guide pillars 2 is known to be 120°, so any guide pillar 2 can be selected as the midpoint A. If the measured angle β is not within the preset angle range, the measured angle β value can be further calculated, and the calculated value is also compared with the preset angle range. If the calculated value is within the preset angle range, the zoom stroke of the adjustment ring 10 is qualified; if the calculated value is also not within the preset angle range, the zoom stroke of the adjustment ring 10 is unqualified.

[0089] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A lens zoom stroke testing device, wherein the lens to be tested comprises an adjustment ring (10), an inner wall of the adjustment ring (10) is provided with an inclined groove (101), one end of the inclined groove (101) is provided with an opening (1012), and the other end of the inclined groove (101) is provided with a blind end (1011), and the adjustment ring (10) further comprises a screw hole (102) penetrating the peripheral wall in a radial direction, wherein: The testing device comprises: A center column (1) can be coaxially inserted into the adjustment ring (10), and a radially extending support groove (121) is formed on an end surface of one end of the center column (1); A guide column (2), wherein the guide column (2) is placed in the support groove (121) along the radial direction of the center column (1), and the end of the guide column (2) protrudes from the circumferential side wall of the center column (1) and is used to cooperate with the inclined groove (101), and the guide column (2) can slide along the inclined groove (101) from the opening (1012) to the blind end (1011).

2. The lens zoom stroke testing device according to claim 1, characterized in that: A ring platform (12) is convexly provided on the end surface of one end of the center column (1), the axis of the ring platform (12) coincides with the axis of the center column (1), and the outer circumferential surface of the ring platform (12) coincides with the circumferential side wall of the center column (1), and the support groove (121) is provided on the end surface of the ring platform (12), and the support groove (121) passes through the ring platform (12).

3. The lens zoom stroke testing device according to claim 2, characterized in that: A central support truncated platform (11) is also protruded from the end surface of the central column (1) on which the annular platform (12) is arranged. The central support truncated platform (11) is coaxial with the annular platform (12) and is arranged at a distance. The other end of the guide column (2) abuts against the side wall of the central support truncated platform (11).

4. The lens zoom stroke testing device according to claim 3, characterized in that: A clamping groove (111) is provided on the side wall of the central supporting truncated table (11), the bottom surface of the clamping groove (111) is arranged parallel to the axis of the central column (1), and the end of the guide column (2) abuts against the bottom surface of the clamping groove (111).

5. The lens zoom stroke testing device according to claim 2, characterized in that: The other end of the central column (1) is connected to a base (3).

6. The lens zoom stroke testing device according to claim 5, characterized in that: The distance between the axis of the guide column (2) and the base (3) is greater than the axial height of the adjustment ring (10).

7. The lens zoom stroke testing device according to claim 1, characterized in that: The lens zoom stroke testing device further comprises a calibration column (4), wherein the calibration column (4) is used to be inserted into the screw hole (102) radially arranged along the adjustment ring (10), and the axis of the calibration column (4) is colinear with the axis of the screw hole (102).

8. The lens zoom stroke testing device according to claim 1, characterized in that: A plurality of the guide pillars (2) and the support grooves (121) are evenly distributed along the circumference of the central pillar (1), and the number of the guide pillars (2) and the support grooves (121) is the same as the number of the inclined grooves (101) of the adjustment ring (10), and the plurality of guide pillars (2) are respectively arranged in a plurality of corresponding support grooves (121).

9. A testing method using the lens zoom stroke testing device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Installation: The adjusting ring (10) is coaxially sleeved on the central column (1), and the adjusting ring (10) is rotated so that the end of the guide column (2) enters the inclined groove (101) from the opening (1012) of the inclined groove (101) and moves to the blind end (1011) of the inclined groove (101); S2, measurement: measuring the angle β between the axis of the guide column (2) and the axis of the screw hole (102) of the adjustment ring (10); S3, verification: comparing the included angle β with a preset angle range. If the included angle β is within the preset angle range, the zoom stroke of the lens is qualified.

10. The method for testing the zoom range of a lens according to claim 9, characterized in that: The step S2 specifically includes: S21, inserting the verification column (4) into the screw hole (102) of the adjustment ring (10); S22, measuring the angle between the axis of the guide column (2) and the axis of the verification column (4) as the angle β.

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