Lens macular height detection comprehensive fixture

Abstract

The application provides a lens yellow spot height detection comprehensive jig, which comprises a detection jig, a socket seat and a displacement sensor. The socket seat is used for fixing a measured lens and has a reference surface which is used for abutting against a flange surface of the measured lens. The displacement sensor is fixedly installed on the socket seat, and a test end of the displacement sensor faces a yellow spot height test surface of the measured lens. The zero return jig comprises a zero return block, a gasket and a socket. The socket is detachably connected with the zero return block, and the gasket is clamped between the socket and the zero return block, so that when the socket is installed on the socket seat, a flange reference surface of the socket is flush with a zero return surface of the zero return block. In the case that the socket is installed on the socket seat, the flange reference surface of the socket abuts against the reference surface, and the test end of the displacement sensor is opposite to the zero return surface of the zero return block. The reference of the yellow spot height detection is unified to the flange surface of the lens by means of the zero return jig, so that the accuracy of the detection result is ensured and the consistency with the lens is ensured.

Description

Technical Field

[0001] This application belongs to the field of testing fixture technology, and more specifically, relates to a comprehensive fixture for detecting the macular height of a lens. Background Technology

[0002] The lens's rangefinder focusing simulates the double-image superposition principle of traditional rangefinder cameras within the electronic viewfinder. When the user rotates the manual focus ring on the lens, the camera adjusts the relative positions of the two offset images in real time based on the amount of rotation. When the two images completely overlap without any misalignment at a certain angle, it indicates that the current focusing distance matches the subject distance, and focusing is complete.

[0003] However, after prolonged use, the mechanical components of the camera's spot focusing system, such as the spot linkage mechanism within the lens mount and the arm connected to the cam, will wear down due to frequent operation. Furthermore, when the camera is subjected to external forces such as impacts or vibrations, the mechanical components in the spot focusing system may shift, causing a deviation in the spot height, resulting in a discrepancy between the position the spot is focused on and the actual position of the sharp focus. Additionally, different lenses have different optical structures and focusing characteristics, which may not be perfectly compatible with the camera's spot focusing system. When using multiple lenses, if it is found that the actual image is not at its sharpest when one or more lenses are in focus, the spot height of the lenses needs to be adjusted to suit the camera.

[0004] The most common method currently is to use a lens macular height detection fixture to assist in adjusting the macular height. This fixture often uses handheld detection elements, which can cause detection errors due to hand tremors, resulting in poor detection accuracy. Utility Model Content

[0005] The purpose of this application is to provide a comprehensive fixture for detecting the macular height of a lens, so as to solve the technical problem of low accuracy in macular height detection in the prior art.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a comprehensive fixture for detecting the macular height of a lens, comprising: The testing fixture includes a bayonet mount and a displacement sensor. The bayonet mount is used to fix the lens under test. The bayonet mount has a reference surface, which is used to abut against the flange surface of the lens under test. The displacement sensor is fixedly installed on the bayonet mount, and the test end of the displacement sensor faces the macular height test surface of the lens under test. A zeroing fixture includes a zeroing block, a gasket, and a bayonet. The bayonet is detachably connected to the zeroing block. The gasket is sandwiched between the bayonet and the zeroing block so that when the bayonet is installed on the bayonet seat, the flange reference surface of the bayonet is flush with the zeroing surface of the zeroing block. When the bayonet is installed on the bayonet seat, the flange reference surface of the bayonet abuts against the reference surface. The test end of the displacement sensor is opposite to the zeroing surface of the zeroing block.

[0007] Optionally, the displacement sensor is fixed to the bayonet seat by a clamp.

[0008] Optionally, the clamp includes a base plate, a seat, and a locking member. The base plate is fixedly connected to the bayonet seat, and the seat is fixed to the base plate. The seat has a clamping cavity and two connecting lugs. The channel between the two connecting lugs communicates with the clamping cavity. The detection end of the displacement sensor extends into the bayonet seat through the clamping cavity. The locking member is detachably installed on the connecting lugs and can clamp and release the displacement sensor in the clamping cavity.

[0009] Optionally, the base plate and the seat body are an integral structure; and / or, the seat body is provided with a through hole.

[0010] Optionally, the bayonet seat is annular, and the side of the base plate opposite to the seat body abuts against one end face of the bayonet seat. The base plate and the bayonet seat are fixedly connected by a plurality of fasteners.

[0011] Optionally, the base plate is provided with a clearance hole corresponding to the inner ring of the bayonet seat, and the diameter of the clearance hole is not less than the inner ring diameter of the bayonet seat.

[0012] Optionally, the displacement sensor is a digital micrometer, and the probe of the digital micrometer extends into the bayonet mount so as to abut against the macular test surface of the lens under test.

[0013] Optionally, a test block is installed at the probe end of the digital micrometer.

[0014] Optionally, it also includes a connector, which has a first threaded section and a second threaded section. The first threaded section is threadedly connected to the probe of the digital micrometer, and the second threaded section is threadedly connected to the test block.

[0015] Optionally, the outer peripheral wall of the zeroing block has a stepped surface, the stepped surface including a radial surface extending radially along the zeroing block and an axial surface extending axially along the zeroing block, the latch is sleeved on the axial surface, and the gasket is sleeved outside the axial surface and sandwiched between the latch and the axial surface.

[0016] The beneficial effects of the lens magnificence height detection fixture provided in this application are as follows: Compared with the prior art, in this application, the displacement sensor is fixed on the bayonet mount, avoiding the shaking and errors caused by hand measurement; in addition to the detection fixture, it also includes a zeroing fixture, which unifies the benchmark for magnificence height detection to the flange surface of the lens, ensuring the accuracy of the detection results and consistency with the lens; at the same time, the zeroing fixture includes a separately set zeroing block, a shim, and a bayonet, and the zeroing surface of the zeroing block is flush with the flange reference surface of the bayonet by adjusting the shim, thereby compensating for the manufacturing tolerance of the zeroing fixture, so that the test end of the displacement sensor can achieve high-precision virtual zeroing on the flange surface of the lens even if it cannot directly detect the flange surface of the lens. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an exploded structural diagram of the testing fixture provided in an embodiment of this application.

[0019] Figure 2 This is a three-dimensional structural diagram of the lens provided in an embodiment of this application.

[0020] Figure 3 for Figure 1 The diagram shows a cross-sectional structure of the inspection fixture used to inspect the lens.

[0021] Figure 4 This is a three-dimensional structural diagram of the zeroing fixture provided in the embodiments of this application.

[0022] Figure 5 for Figure 4 The diagram shows a cross-sectional structure of the zeroing fixture and the testing fixture after assembly.

[0023] The following are the labeling elements in the figure: 100. Testing fixture; 110. Bayonet seat; 111. Reference surface; 120. Displacement sensor; 130. Clamp; 131. Base plate; 132. Seat body; 133. Locking component; 134. Clamping cavity; 135. Connecting lug; 136. Through hole; 137. Clearance hole; 140. Fastener; 150. Test block; 160. Connector; 161. First threaded section; 162. Second threaded section; 200. Zeroing fixture; 210. Zeroing block; 211. Zeroing surface; 212. Stepped surface; 220. Gasket; 230. Bayonet; 231. Flange reference surface; 300, Lens under test; 310, Flange surface; 320, Macular height test surface. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] This application provides a comprehensive fixture for detecting the macular height of a lens, such as... Figure 1 and Figure 4 As shown, the device includes a testing fixture 100 and a zeroing fixture 200. The testing fixture 100 is used to test the macula height of the lens 300 under test. The zeroing fixture 200 is used to zero-calibrate the displacement sensor 120 before the testing fixture 100 tests the macula height.

[0029] like Figure 1As shown, the testing fixture 100 includes a bayonet mount 110 and a displacement sensor 120. The bayonet mount 110 is used to fix the lens under test 300, and the displacement sensor 120 is fixedly installed on the bayonet mount 110. The bayonet mount 110 has a reference surface 111, which abuts against the flange surface 310 of the lens under test 300. The test end of the displacement sensor 120 faces the macular height test surface 320 of the lens under test 300. The displacement sensor 120 is zeroed using the flange surface 310 of the lens under test as a reference. When the lens under test 300 is mounted on the bayonet mount 110, the test end of the displacement sensor 120 faces the macular height test surface 320, and the detected value is the macular height.

[0030] like Figure 4 and Figure 5 As shown, the zeroing fixture 200 includes a zeroing block 210, a gasket 220, and a bayonet 230. The bayonet 230 is detachably connected to the zeroing block 210. The gasket 220 is sandwiched between the bayonet 230 and the zeroing block 210 so that when the bayonet 230 is installed on the bayonet seat 110, the flange reference surface 231 of the bayonet 230 is flush with the zeroing surface 211 of the zeroing block 210. Specifically, when the bayonet 230 is installed on the bayonet seat 110, the flange reference surface 231 of the bayonet 230 abuts against the reference surface 111, and the test end of the displacement sensor 120 is opposite to the zeroing surface 211 of the zeroing block 210.

[0031] The macula height is the height difference between the flange surface 310 of the lens under test 300 and the macula height test surface 320. From Figure 2 As can be seen, the magnifying glass surface 320 and the flange surface 310 of the lens under test 300 are not in the same position. Since the displacement sensor 120, after being fixed to the bayonet mount 110, faces the magnifying glass surface 320 of the lens under test 300, it cannot be directly zeroed on the flange surface 310 of the lens under test 300. A zeroing fixture 200 is needed to zero the displacement sensor 120 first. Specifically, before using the testing fixture 100, the zeroing fixture 200 is used to zero the displacement sensor 120 on the flange surface 310 of the lens under test 300. Then, the zeroing fixture 200 is removed from the testing fixture 100 and the lens under test 300 is installed. At this point, the magnifying glass surface 320 of the lens under test 300 will face the testing end of the displacement sensor 120, and the value detected by the displacement sensor 120 is the magnifying glass height of the lens under test 300.

[0032] If the zeroing fixture 200 adopts an integrated structure, it will have a flange reference surface 231 and a zeroing surface 211. After the zeroing fixture 200 is installed on the bayonet seat 110, the flange reference surface 231 abuts against the reference surface 111. The flange reference surface 231 and the zeroing surface 211 are located on the same plane, and their relative positions are the same as the relative positions of the flange surface 310 and the macula height testing surface 320 in the lens under test 300. Thus, the displacement sensor 120 can be zeroed using the zeroing surface 211. However, due to the existence of tolerances in machining, it cannot be guaranteed that there are no tolerances between the flange reference surface 231 and the zeroing surface 211 in the integrated zeroing fixture 200. Therefore, if... Figure 4 and Figure 5 As shown, the zeroing fixture 200 provided in this embodiment includes a zeroing block 210, a gasket 220, and a bayonet 230, which are separately arranged. The end face of the zeroing block 210 serves as the zeroing surface 211 facing the test end of the displacement sensor 120. The end face of the bayonet 230 serves as the flange reference surface 231, which abuts against the reference surface 111. By compensating with gaskets 220 of different thicknesses, the flange reference surface 231 and the zeroing surface 211 are approximately without tolerance or even absolutely flush, which improves the accuracy of the zeroing operation and helps to reduce the error in the detection of the macula height.

[0033] After zeroing the testing fixture 100, the lens's magnifying glass height can be measured. First, fix the lens on the mount 110, then rotate the lens's focus ring. At this time, the magnifying glass ring, i.e., the magnifying glass height testing surface 320, will move towards the testing end of the displacement sensor 120. The displacement value detected by the displacement sensor 120 is the magnifying glass height at the required focus distance. After recording the magnifying glass height data, the next lens can be replaced. Understandably, there is no need to recalibrate when changing lenses, allowing for quick measurement of the next lens and improving repair and adjustment efficiency.

[0034] The bayonet 230 has a similar structure to the bayonet 230 at the end of the lens 300 under test, and can be mounted on the bayonet mount 110 to perform zeroing operation on the displacement sensor 120. For example, if the end of the lens uses an M-mount, and the bayonet mount 110 uses a standard M-mount mount, both the zeroing fixture 200 and the lens can be installed and positioned in conjunction with the bayonet mount 110.

[0035] The lens macular height detection fixture provided in this application embodiment has a displacement sensor 120 fixed on a bayonet mount 110 to avoid shaking and errors caused by handheld measurement. In addition to the detection fixture 100, it also includes a zeroing fixture 200. The zeroing fixture 200 unifies the benchmark for macular height detection to the flange surface 310 of the lens, ensuring the accuracy of the detection results and consistency with the lens. At the same time, the zeroing fixture 200 includes a separately configured zeroing block 210, a shim 220, and a bayonet mount 230. The shim 220 is adjusted to make the zeroing surface 211 of the zeroing block 210 flush with the flange reference surface 231 of the bayonet mount 230, thereby compensating for the manufacturing tolerance of the zeroing fixture 200. This allows the test end of the displacement sensor 120 to achieve high-precision virtual zeroing on the flange surface 310 of the lens even if it cannot directly detect the flange surface 310 of the lens.

[0036] In some alternative embodiments, see Figure 1 and Figure 3 The displacement sensor 120 is fixed to the bayonet seat 110 by a clamp 130. Specifically, the clamp 130 includes a base plate 131, a seat body 132, and a locking member 133. The base plate 131 is fixedly connected to the bayonet seat 110, and the seat body 132 is fixed to the base plate 131. The seat body 132 has a clamping cavity 134 and two connecting lugs 135, and the channel between the two connecting lugs 135 communicates with the clamping cavity 134. The detection end of the displacement sensor 120 extends into the bayonet seat 110 through the clamping cavity 134. The locking member 133 is detachably installed on the connecting lugs 135 and can clamp and release the displacement sensor 120 by the clamping cavity 134.

[0037] There is a gap between the connecting lug 135 and the base plate 131, and it is cantilevered. For example... Figure 1 As shown, the locking element 133 is a fastening bolt, and each of the two connecting lugs 135 has a connecting hole. The fastening bolt passes through the connecting holes on the two connecting lugs 135. When the fastening bolt is tightened, the two connecting lugs 135 move closer together, and the clamping cavity 134 contracts to clamp the displacement sensor 120. When the fastening bolt is loosened, the two connecting lugs 135 move further apart, and the clamping cavity 134 opens to release the displacement sensor 120.

[0038] Optionally, the base plate 131 and the seat 132 are an integral structure. To reduce the weight of the entire inspection fixture 100 and facilitate lens focusing, the seat 132 is provided with a through hole 136. The projection of the through hole 136 onto the bayonet mount 110 falls within the inner ring of the bayonet mount 110.

[0039] See Figure 1 and Figure 3 The bayonet seat 110 is annular, and the side of the base plate 131 opposite to the seat body 132 abuts against one end face of the bayonet seat 110. The base plate 131 and the bayonet seat 110 are fixedly connected by multiple fasteners 140.

[0040] Optionally, the fastener 140 is a screw. Multiple fasteners 140 are evenly spaced along the axial direction of the bayonet seat 110 to improve the stability of the connection between the bayonet seat 110 and the base plate 131. Figure 1 As shown, the four fasteners 140 are arranged in a square array.

[0041] The base plate 131 has a clearance hole 137 on the inner ring of the bayonet seat 110. The diameter of the clearance hole 137 is not less than the diameter of the inner ring of the bayonet seat 110, so that the test end of the displacement sensor 120 and the end face of the lens are not interfered with by the base plate 131.

[0042] The displacement sensor 120 is a digital dial indicator. The probe of the digital dial indicator extends into the bayonet mount 110 so as to abut against the macular test surface of the lens 300 being tested.

[0043] During testing, the lens is fixed on the mount 110, and the lens's focus ring is rotated. At this time, the magnifying ring, also known as the magnifying height test surface 320, will cause the test end of the digital micrometer to extend or retract. The magnifying height at the required focus distance can then be read from the digital micrometer. After recording the magnifying height data, the next lens can be replaced.

[0044] A digital dial indicator can display the test data in real time, allowing the operator to monitor changes in the macula height during lens focusing. Compared to traditional methods relying on visual inspection or intuition, this embodiment uses a digital dial indicator to directly read precise changes in macula height throughout the entire process of rotating the focus ring.

[0045] In some specific embodiments of this application, a test block 150 is installed at the probe end of the digital micrometer. The probe end of the digital micrometer is usually made of precision-ground hard alloy, which will wear down due to repeated contact with the workpiece being measured, affecting the detection accuracy of the digital micrometer. The test block 150 is detachably installed at the end of the digital micrometer and can be replaced after wear occurs, thus protecting the digital micrometer.

[0046] Optionally, the test block 150 may be spherical or cylindrical. See also Figure 1 The outer periphery of the test block 150 is cylindrical, and the probe of the digital micrometer is inserted radially along the cylindrical test block 150. The macular height test surface 320 is planar. During testing, when the lens under test 300 is mounted on the bayonet mount 110, the cylindrical surface of the test block 150 abuts against the macular height test surface 320. At this time, the test block 150 and the macular height test surface 320 are tangent and in line contact, which can reduce the detection error caused by the manufacturing error of the macular height test surface 320.

[0047] See Figure 1The lens macular height detection fixture also includes a connector 160, which has a first threaded section 161 and a second threaded section 162. The first threaded section 161 is threadedly connected to the probe of the digital micrometer, and the second threaded section 162 is threadedly connected to the test block 150.

[0048] Specifically, connector 160 is a double-ended screw, with threaded sections at both ends. For example... Figure 1 As shown, one end of the connector 160 is provided with a first threaded section 161, and the other end is provided with a second threaded section 162. When the test block 150 is worn, the test block 150 can be removed from the probe of the digital micrometer to replace it with a new test block 150.

[0049] The outer peripheral wall of the zeroing block 210 has a stepped surface 212, which includes a radial surface extending radially along the zeroing block 210 and an axial surface extending axially along the zeroing block 210. The bayonet 230 is sleeved on the axial surface, and the gasket 220 is sleeved on the outside of the axial surface and sandwiched between the bayonet 230 and the axial surface.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A comprehensive fixture for detecting the macular height of a lens, characterized in that: include: The testing fixture (100) includes a bayonet mount (110) and a displacement sensor (120). The bayonet mount (110) is used to fix the lens under test (300). The bayonet mount (110) has a reference surface (111). The reference surface (111) is used to abut against the flange surface (310) of the lens under test (300). The displacement sensor (120) is fixedly installed on the bayonet mount (110). The test end of the displacement sensor (120) faces the macular height test surface (320) of the lens under test (300). The zeroing fixture (200) includes a zeroing block (210), a gasket (220), and a bayonet (230). The bayonet (230) is detachably connected to the zeroing block (210). The gasket (220) is sandwiched between the bayonet (230) and the zeroing block (210) so that when the bayonet (230) is installed on the bayonet seat (110), the flange reference surface (231) of the bayonet (230) is flush with the zeroing surface (211) of the zeroing block (210). When the bayonet (230) is installed on the bayonet seat (110), the flange reference surface (231) of the bayonet (230) abuts against the reference surface (111). The test end of the displacement sensor (120) is opposite to the zeroing surface (211) of the zeroing block (210).

2. The integrated fixture for detecting the macular height of a lens as described in claim 1, characterized in that: The displacement sensor (120) is fixed to the bayonet seat (110) by a clamp (130).

3. The integrated fixture for detecting the macular height of a lens as described in claim 2, characterized in that: The clamp (130) includes a base plate (131), a seat (132), and a locking member (133). The base plate (131) is fixedly connected to the bayonet seat (110). The seat (132) is fixed on the base plate (131). The seat (132) has a clamping cavity (134) and two connecting lugs (135). The channel between the two connecting lugs (135) communicates with the clamping cavity (134). The detection end of the displacement sensor (120) passes through the clamping cavity (134) and extends into the bayonet seat (110). The locking member (133) is detachably installed on the connecting lugs (135) and can clamp and release the displacement sensor (120) in the clamping cavity (134).

4. The integrated fixture for detecting the macular height of a lens as described in claim 3, characterized in that: The base plate (131) and the seat (132) are an integral structure; and / or, the seat (132) is provided with a through hole (136).

5. The integrated fixture for detecting the macular height of a lens as described in claim 3, characterized in that: The bayonet seat (110) is annular, and the side of the base plate (131) opposite to the seat body (132) abuts against one end face of the bayonet seat (110). The base plate (131) and the bayonet seat (110) are fixedly connected by a plurality of fasteners (140).

6. The integrated fixture for detecting the macular height of a lens as described in claim 5, characterized in that: The base plate (131) is provided with a clearance hole (137) corresponding to the inner ring of the bayonet seat (110), and the diameter of the clearance hole (137) is not less than the inner ring diameter of the bayonet seat (110).

7. The integrated fixture for detecting the macular height of a lens as described in claim 1, characterized in that: The displacement sensor (120) is a digital micrometer, and the probe end of the digital micrometer extends into the bayonet mount (110) so as to abut against the macular test surface of the lens under test (300).

8. The integrated fixture for detecting the macular height of a lens as described in claim 7, characterized in that: The probe end of the digital micrometer is equipped with a test block (150).

9. The integrated fixture for detecting the macular height of a lens as described in claim 8, characterized in that: It also includes a connector (160), which has a first threaded section (161) and a second threaded section (162). The first threaded section (161) is threadedly connected to the probe of the digital micrometer, and the second threaded section (162) is threadedly connected to the test block (150).

10. The integrated fixture for detecting the macular height of a lens as described in claim 1, characterized in that: The outer peripheral wall of the zeroing block (210) has a stepped surface (212), the stepped surface (212) includes a radial surface extending radially along the zeroing block (210) and an axial surface extending axially along the zeroing block (210), the latch (230) is sleeved on the axial surface, and the gasket (220) is sleeved outside the axial surface and sandwiched between the latch (230) and the axial surface.

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