CN209793631U - Pressing ring dismounting device for optical lens group - Google Patents
Pressing ring dismounting device for optical lens group Download PDFInfo
- Publication number
- CN209793631U CN209793631U CN201920586075.0U CN201920586075U CN209793631U CN 209793631 U CN209793631 U CN 209793631U CN 201920586075 U CN201920586075 U CN 201920586075U CN 209793631 U CN209793631 U CN 209793631U
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- China
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- clamping ring
- lens group
- pressing ring
- spanner
- ring spanner
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Abstract
The utility model relates to an optics mirror group clamping ring dismounting device solves the problem that current clamping ring demolishs the method and easily causes optics mirror surface fish tail, pollution and manufacturing cost to increase. The dismounting device comprises a central positioning shaft, a lens group positioning sleeve, a nut, a second spacer sleeve, a first spacer sleeve, a pressing ring spanner handle, a pressing ring spanner straight rod, a pressing ring spanner arm seat and a pressing ring spanner torsion rod; the lens group positioning sleeve is sleeved outside the lens base; the upper end of the lens group positioning sleeve is provided with a beam, the lower end of the central positioning shaft is provided with a positioning cylinder, and the positioning cylinder is matched with a positioning hole on the beam; the lower end of the central positioning shaft is fixedly connected with the cross beam, and the upper end of the central positioning shaft is sequentially sleeved with a first spacer bush, a second spacer bush, a pressing ring spanner straight rod and a nut from bottom to top; one end of the pressing ring spanner arm seat is slidably sleeved on the pressing ring spanner straight rod, the other end of the pressing ring spanner arm seat is fixedly connected with the pressing ring spanner torsion rod, and the pressing ring spanner handle is arranged at the end part of the pressing ring spanner straight rod.
Description
Technical Field
the utility model relates to an optics precision apparatus field, concretely relates to prevent optical lens group clamping ring dismounting device of mirror surface fish tail.
background
in order to ensure that the optical lens has excellent imaging quality, in the assembling and adjusting process, the micro-stress assembly of the lens in each lens group is required to be ensured besides the consistency of the optical axes of the lens groups, and the micro-stress assembly of the lens is an important link in the assembly of the optical lens and is also a difficult point.
in the lens assembly structure shown in fig. 2, the lens 11 and the lens holder 13 are in clearance fit, and the lens 11 is first mounted on the lens holder 13 and then screwed into the pressing ring 14. In order to ensure the micro-stress assembly of the optical lens and enable the optical lens to adapt to working conditions such as vibration, impact and the like, a small amount of silica gel is coated on the external thread of the pressing ring 14 to prevent looseness before the pressing ring 14 is screwed in, and then the silica gel is injected from the outer circle gel hole of the lens base 13 to fix the lens. Even so, the assembling stress and optical finishing often cause the deterioration of the lens surface shape, and finally the image quality of the whole lens is deteriorated. At this time, the only way is to remove the lens 11 with the deteriorated surface shape and perform the micro-stress mounting again. The first step of disassembling the lens 11 is to disassemble the pressing ring 14, and as mentioned above, the pressing ring 14 of the lens set is coated with silicone on the external threads before screwing into the lens base 13, and at this time, a sufficiently large torque (especially for lenses with a caliber larger than 100 mm) must be applied to unscrew the pressing ring 14, which is very likely to cause scratches on the lens surface.
The first method is to adopt a common non-positioning pressing ring spanner to disassemble the lens group, the spanner is clamped into a clamping groove of the pressing ring during disassembly, and the spanner is easy to fall out of the clamping groove to scratch an optical mirror surface during the process of screwing out the pressing ring; the second method is to perform destructive dismantling by machining, for example, a lathe or a milling machine is used for turning off or cutting off a lens group pressing ring, the method is at the cost of destroying the structure of a mechanical part, on one hand, the mirror surface is easily scratched by chips generated in machining, and the mirror surface is polluted by oil stains, on the other hand, the mechanical structure part is damaged and must be re-machined, so that the production progress is prolonged, and the production cost is increased.
SUMMERY OF THE UTILITY MODEL
the utility model aims at solving the problem that the current clamping ring demolition method easily causes optical mirror surface fish tail, pollution and manufacturing cost increase, providing an optical lens group clamping ring dismounting device that can avoid the mirror surface fish tail.
The utility model discloses specific technical scheme does:
An optical lens group clamping ring dismounting device comprises a lens group positioning assembly and a distance-adjustable spanner assembly; the lens group positioning assembly comprises a central positioning shaft, a lens group positioning sleeve, a nut, a second spacer bush and a first spacer bush; the adjustable-distance wrench assembly comprises a clamping ring wrench handle, a clamping ring wrench straight rod, a plurality of groups of clamping ring wrench arm seats and a plurality of groups of clamping ring wrench torsion bars; the lens group positioning sleeve is sleeved outside the lens base, and the circumferential limiting of the lens group positioning sleeve and the lens base is realized through a limiting device; the upper end of the lens group positioning sleeve is provided with a cross beam, the lower end of the central positioning shaft is provided with a positioning cylinder, and the positioning cylinder is matched with a positioning hole in the cross beam to realize the coaxial installation of the positioning cylinder and the lens group positioning sleeve; the lower end of the central positioning shaft is fixedly connected with the cross beam, and the central positioning shaft is sequentially sleeved with a first spacer bush, a second spacer bush, a straight rod of a ring pressing wrench and a nut from bottom to top; the nut is in threaded connection with the central positioning shaft; the multi-group clamping ring spanner arm seats are located on two sides of the central positioning shaft, one end of each clamping ring spanner arm seat is slidably sleeved on a clamping ring spanner straight rod, the other end of each clamping ring spanner arm seat is fixedly connected with a clamping ring spanner torsion rod, the disassembly end of the clamping ring spanner torsion rod is matched with the clamping ring for realizing disassembly and assembly of the clamping ring, and a clamping ring spanner handle is arranged at the end of the clamping ring spanner straight rod.
Furthermore, the limiting device is a limiting screw, a limiting hole is formed in the outer peripheral surface of the lens group positioning sleeve, and the limiting screw penetrates through the limiting hole and a rubber hole in the lens base to achieve circumferential limiting of the lens group positioning sleeve and the lens base.
Furthermore, the disassembly end of the torsion bar of the pressing ring wrench is in a flat head shape or a conical head shape and is used for disassembling and assembling the pressing ring.
Furthermore, gasket groups sleeved on the central positioning shaft are arranged between the second spacer sleeve and the pressing ring spanner straight rod and between the pressing ring spanner straight rod and the nut, and each gasket group comprises two polytetrafluoroethylene gaskets which are arranged in a stacked mode.
Furthermore, the lower end of the central positioning shaft is provided with a connecting flange, and the central positioning shaft is fixedly connected with the cross beam through the connecting flange.
further, the straight rod of the pressing ring spanner is a straight rod with a rectangular cross section, and the arm seat of the pressing ring spanner is assembled on the straight rod of the pressing ring spanner through a square hole at the head part of the arm seat.
Furthermore, the two ends of the straight rod of the pressing ring wrench are provided with screws, and the handle of the pressing ring wrench is in threaded connection with the straight rod of the pressing ring wrench.
furthermore, the lower end of the pressing ring spanner arm seat is provided with a cylindrical hole, one end of the pressing ring spanner torsion bar is inserted into the cylindrical hole, and the pressing ring spanner arm seat is fixedly connected with the pressing ring spanner torsion bar through a set screw.
The utility model has the advantages that:
1. The utility model discloses a central location axle has realized adjustable distance spanner subassembly with the spacing dismantlement of waiting to tear open the mirror group with the mirror group position sleeve, has avoided in the dismouting of mirror group clamping ring too big out of control hard, leads to clamping ring spanner torsion bar to deviate from and to look off the clamping ring draw-in groove of mirror group and arouse optical mirror surface fish tail and optical component damage problem.
2. the utility model discloses optical lens group clamping ring dismounting device has avoided the problem that conventional destruction formula dismantlement (the method turning clamping ring that utilizes machining and use specialized tool to its drop) leads to clamping ring structural damage, uses reuse after the clamping ring clearance of this device dismantlement, has reduced processing cycle, has improved production efficiency, has practiced thrift manufacturing cost.
3. the utility model discloses clamping ring dismounting device is organized to optics mirror simple structure, and the preparation is convenient, convenient to use.
Drawings
Fig. 1 is a cross-sectional structural view of the optical lens group clamping ring dismounting device of the present invention;
FIG. 2 is a schematic view of a conventional optical lens assembly;
Fig. 3 is a schematic structural view of the optical lens group clamping ring dismounting device of the present invention;
fig. 4 is a schematic view of the lens group positioning sleeve structure of the optical lens group clamping ring detaching device of the present invention;
Fig. 5 is a schematic view of the central positioning shaft structure of the optical lens group clamping ring dismounting device of the present invention;
Fig. 6 is a schematic diagram of a torsion bar structure of a pressing ring wrench of the device for detaching a pressing ring of an optical lens assembly of the present invention;
Fig. 7 is a schematic view of a pressing ring structure.
reference numerals: 1-a clamping ring wrench handle, 2-a clamping ring wrench straight rod, 3-a clamping ring wrench arm seat, 4-a central positioning shaft, 5-a nut, 6-a second spacer, 7-a first spacer, 8-a clamping ring wrench torsion bar, 9-a lens group positioning sleeve, 10-a limiting device, 11-a lens, 12-a set screw, 13-a lens seat, 14-a clamping ring, 15-a rubber column, 41-a positioning cylinder, 42-a connecting flange, 91-a cross beam, 92-a positioning hole, 93-a limiting hole and 141-a clamping groove.
Detailed Description
the invention is described in further detail below with reference to the following figures and specific examples:
The utility model provides a can avoid optical lens group clamping ring dismounting device of mirror surface fish tail, this clamping ring dismounting device can divide into the adjustable apart from spanner subassembly that the lens group locating component who plays the positioning action and be used for dismantling the clamping ring according to the function.
as shown in fig. 1 to 6, the lens group positioning assembly includes a central positioning shaft 4, a nut 5, a second spacer 6, a first spacer 7 and a lens group positioning sleeve 9; the adjustable-distance wrench assembly comprises a clamping ring wrench handle 1, a clamping ring wrench straight rod 2, two groups of clamping ring wrench arm seats 3 and two groups of clamping ring wrench torsion bars 8; the lens group positioning sleeve 9 is sleeved on the outer side of the lens base 13, and the circumferential limiting of the lens group positioning sleeve 9 and the lens base 13 is realized through a limiting device 10; the upper end of the lens group positioning sleeve 9 is provided with a beam 91, and the lower end of the central positioning shaft 4 is fixedly connected with the beam 91 of the lens group positioning sleeve 9; specifically, the lower end of the center positioning shaft 4 is provided with a connecting flange 42, and the center positioning shaft 4 is fixedly connected with the cross beam 91 through the connecting flange 42. The upper end of the central positioning shaft 4 is sequentially sleeved with a first spacer 7, a second spacer 6, a straight rod 2 of a clamping ring spanner and a nut 5 from bottom to top; the nut 5 is in threaded connection with the central positioning shaft 4, so that the straight rod 2 of the ring pressing wrench can only rotate and cannot move up and down; the multiple groups of clamping ring spanner arm seats 3 are positioned on two sides of the central positioning shaft 4, one end of each clamping ring spanner arm seat 3 is slidably sleeved on the clamping ring spanner straight rod 2, the other end of each clamping ring spanner arm seat is fixedly connected with a clamping ring spanner torsion rod 8, and the disassembly end of each clamping ring spanner torsion rod 8 is in a flat head shape and is used for disassembling and assembling a clamping ring 14; the pressing ring spanner handle 1 is arranged at the end part of the straight rod 2 of the pressing ring spanner, so that the straight rod 2 of the pressing ring spanner can rotate conveniently. The straight rod 2 of the clamping ring wrench is a straight rod with a rectangular cross section, and the clamping ring wrench arm seat 3 is assembled on the straight rod 2 of the clamping ring wrench through a square hole at the head part of the clamping ring wrench arm seat. The two ends of the straight rod 2 of the pressing ring spanner are provided with screw rods, and the handle 1 of the pressing ring spanner is in threaded connection with the straight rod 2 of the pressing ring spanner. The lower extreme of clamping ring spanner arm seat 3 is provided with the cylinder hole, and the one end of clamping ring spanner torsion bar 8 is the conical head, and the conical head inserts the cylinder hole and realizes clamping ring spanner arm seat 3 and the fixed connection of clamping ring spanner torsion bar 8 through holding screw 12. Gasket groups sleeved on the central positioning shaft 4 are arranged between the second spacer bush 6 and the pressing ring spanner straight rod 2 and between the pressing ring spanner straight rod 2 and the nut 5, and the gasket groups can specifically comprise two polytetrafluoroethylene gaskets which are arranged in a stacked mode.
the limiting device 10 may be a limiting screw, a limiting hole 93 is formed in the outer peripheral surface of the lens group positioning sleeve 9, and the limiting screw penetrates through the limiting hole 93 and a rubber hole in the lens base 13 to achieve circumferential limiting of the lens group positioning sleeve 9 and the lens base 13. The outer cylindrical surface of the lens group positioning sleeve 9 is provided with a plurality of straight groove structures (namely, limiting holes 93) uniformly distributed in quantity, and the straight groove structures are used for installing limiting screws to realize circumferential limiting of the lens group positioning sleeve 9 and a lens group to be disassembled. The number of the linear grooves can be set according to the number of the glue injection holes of the lens group lens bases, the glue injection holes of the lens group lens bases are generally uniformly distributed in 3, 4 or 6, and therefore the number of the linear grooves can meet the general requirements by taking 12 minimum common multiples, and can be customized if meeting special numbers.
As shown in fig. 4, a cross beam 91 is designed at the top of the lens group positioning sleeve 9, a positioning hole 92 is designed at the intersection position of the cross beam 91 and the axis of the inner cylindrical surface of the positioning sleeve, the hole is in close clearance fit with the positioning cylinder 41 of the central positioning shaft 4 (preferably, the clearance is 0.02 mm to 0.05 mm), and screw holes are uniformly distributed around the hole for installing the central positioning shaft 4. The through hole of the straight rod 2 of the pressing ring wrench is sleeved on the central positioning shaft 4, and the fit clearance is preferably 0.02-0.05 mm, so that the X, Y-direction displacement of the wrench with the adjustable distance pressing ring 14 can be limited.
The central positioning shaft 4 is of a stepped shaft section structure, a counter bore is designed on a mounting flange at the lower end, and an inner hexagonal counter head screw penetrates through the counter bore to mount the central positioning shaft 4 on the cross beam 91; the central positioning shaft 4 is sequentially provided with a first spacer 7, a second spacer 6 (used for adjusting the Z-direction relative height of a pressing ring wrench torsion bar 8 and a lens group pressing ring 14 in a matching mode), a lower polytetrafluoroethylene gasket group (double gasket group), a pressing ring wrench straight bar 2, an upper polytetrafluoroethylene gasket group (double gasket group) and a nut 5 (capable of being replaced by the double gasket 5), the structure limits Z-direction displacement of the pressing ring wrench 14 and rotation around the X, Y shaft, and therefore the pressing ring wrench 14 can only rotate around the Z shaft. The upper polytetrafluoroethylene gasket group and the lower polytetrafluoroethylene gasket group reduce damping of the adjustable-pitch clamping ring 14 during wrench rotation by utilizing self-lubricating effect of polytetrafluoroethylene gasket materials.
The adjustable-distance pressing ring spanner straight rod 2 is of a rectangular cross-section straight rod structure, and screw sections at two ends are used for mounting a pressing ring spanner handle 1; the pressing ring spanner arm seat 3 is assembled on the pressing ring spanner straight rod 2 through a square hole at the head part and can slide along the straight rod so as to realize the assembly and disassembly of the pressing ring 14 of the lens group to be disassembled with different diameters and sizes; a cylindrical hole at the lower end of the pressing ring spanner arm seat 3 is provided with a pressing ring spanner torsion bar 8 and is fastened and limited by a set screw 12; one end of the torsion bar 8 of the clamping ring wrench is a conical head, and the other end is a flat head, and the torsion bar is used for disassembling and assembling the clamping ring 14 with different clamping groove structures. Clamping groove 141 or pinhole structure are designed on clamping ring 14 commonly used and are used for the dismouting of clamping ring 14, and its structure chart 7 is shown, the utility model discloses clamping ring spanner torsion bar 8 one end is the conical head, and one end is flat to be suitable for the dismouting that has clamping groove 141 or pinhole structure clamping ring 14.
The utility model provides a lens dismantlement method based on above-mentioned optical lens group clamping ring dismounting device, including following step:
1) The mirror surface is protected stably by using a mirror surface protective cover, parchment paper and the like, so that the pollution of the mirror surface is avoided;
2) the optical lens group is arranged on the optical platform, and the optical lens group is fixedly connected to the optical platform by using screws, so that the situation that the screws are slightly tightened to deform the lens base 13 due to excessive pretightening force is avoided;
3) Cleaning the rubber columns 15 in the screw holes of the lens base 13 of the lens group by using a special rubber removing tool to ensure that the limit screws can be smoothly screwed in;
4) sleeving the lens group positioning sleeve 9 into the lens base 13, and installing a limiting screw, wherein special attention needs to be paid to the length of the limiting screw so as to prevent the screw from being screwed too deep to be pushed onto the outer cylindrical surface of the lens 11 and damaging an optical piece;
5) The central positioning shaft 4 is mounted on the cross beam 91 through a screw;
6) selecting a second spacer bush 6 with proper thickness through measurement and size chain calculation, and sequentially installing a first spacer bush 7, the second spacer bush 6 and a lower polytetrafluoroethylene gasket group (double gaskets) on the central positioning shaft 4;
7) Assembling a wrench component of the adjustable clamping ring 14; during installation, the head of the torsion bar 8 of the clamping ring wrench is matched with the clamping groove of the clamping ring 14, and the torsion bar 8 of the clamping ring wrench is confirmed to be reliably positioned through the set screw 12;
8) a spanner with adjustable distance pressing rings 14 is installed in the central positioning shaft 4, then a polytetrafluoroethylene gasket group (double gaskets) and a nut 5 group are installed, the nut 5 group is properly pre-tightened, the spanner is ensured to rotate flexibly, and the distance between torsion bars 8 of the spanner with the adjustable distance pressing rings at two ends is adjusted;
9) After the installation is confirmed to be stable again, the pressing ring 14 is detached by gradually applying force and rotating the wrench;
10) removing the positioning structure of the lens group and the wrench of the adjustable distance pressing ring 14, using a feeler gauge to manufacture a sawtooth-shaped glue removing tool, cleaning glue spots between the outer cylindrical surface of the lens 11 and the inner hole of the lens base 13, and finally using a special sucking disc or a special dismounting cylinder to dismount the mirror/reflecting mirror.
Claims (8)
1. The utility model provides an optics mirror group clamping ring dismounting device which characterized in that: comprises a lens group positioning component and a distance adjustable spanner component;
The lens group positioning assembly comprises a central positioning shaft (4), a nut (5), a second spacer bush (6), a first spacer bush (7) and a lens group positioning bush (9);
the adjustable-distance wrench assembly comprises a clamping ring wrench handle (1), a clamping ring wrench straight rod (2), a plurality of groups of clamping ring wrench arm seats (3) and a plurality of groups of clamping ring wrench torsion bars (8);
The lens group positioning sleeve (9) is provided with a limiting device (10) for realizing circumferential limiting of the lens group positioning sleeve (9) and the outer side of the lens base (13); a cross beam (91) is arranged at the upper end of the lens group positioning sleeve (9), a positioning cylinder (41) is arranged at the lower end of the central positioning shaft (4), and the positioning cylinder (41) is matched with a positioning hole (92) in the cross beam (91) to realize the coaxial installation of the positioning cylinder (41) and the lens group positioning sleeve (9);
The lower end of the central positioning shaft (4) is fixedly connected with the cross beam (91), and the central positioning shaft (4) is sequentially sleeved with a first spacer bush (7), a second spacer bush (6), a clamping ring spanner straight rod (2) and a nut (5) from bottom to top; the nut (5) is in threaded connection with the central positioning shaft (4);
The multiple groups of clamping ring spanner arm seats (3) are positioned on two sides of the central positioning shaft (4), one ends of the clamping ring spanner arm seats (3) are slidably sleeved on the clamping ring spanner straight rod (2), the other ends of the clamping ring spanner arm seats are fixedly connected with a clamping ring spanner torsion rod (8), and the disassembly end of the clamping ring spanner torsion rod (8) is used for being matched with the clamping ring (14) to realize the disassembly and assembly of the clamping ring (14); the pressing ring spanner handle (1) is arranged at the end part of the straight rod (2) of the pressing ring spanner.
2. the optical lens group clamping ring dismounting device according to claim 1, wherein: the limiting device (10) is a limiting screw, a limiting hole (93) is formed in the outer peripheral face of the lens group positioning sleeve (9), and the limiting screw penetrates through the limiting hole (93) and a rubber hole in the lens base (13) to achieve circumferential limiting of the lens group positioning sleeve (9) and the lens base (13).
3. the optical lens group clamping ring dismounting device according to claim 2, wherein: the disassembly end of the pressing ring wrench torsion bar (8) is in a flat head shape or a conical head shape and is used for disassembling and assembling the pressing ring (14).
4. The optical lens group clamping ring dismounting device according to claim 3, wherein: gasket groups sleeved on the central positioning shaft (4) are arranged between the second spacer sleeve (6) and the pressing ring spanner straight rod (2) and between the pressing ring spanner straight rod (2) and the nut (5), and each gasket group comprises two polytetrafluoroethylene gaskets which are arranged in a stacked mode.
5. The apparatus for detaching a pressing ring of an optical lens assembly according to any one of claims 1 to 4, wherein: the lower end of the central positioning shaft (4) is provided with a connecting flange (42), and the central positioning shaft (4) is fixedly connected with the cross beam (91) through the connecting flange (42).
6. The optical lens group clamping ring dismounting device according to claim 5, wherein: the straight pressing ring wrench rod (2) is a straight rod with a rectangular cross section, and the pressing ring wrench arm seat (3) is assembled on the straight pressing ring wrench rod (2) through a square hole in the head part of the pressing ring wrench arm seat.
7. The optical lens group clamping ring dismounting device according to claim 6, wherein: the two ends of the straight pressing ring wrench rod (2) are provided with screws, and the pressing ring wrench handle (1) is in threaded connection with the straight pressing ring wrench rod (2).
8. the optical lens group clamping ring dismounting device according to claim 7, wherein: the lower extreme of clamping ring spanner arm seat (3) is provided with the cylinder hole, the one end of clamping ring spanner torsion bar (8) inserts the cylinder hole and realizes the fixed connection of clamping ring spanner arm seat (3) and clamping ring spanner torsion bar (8) through holding screw (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920586075.0U CN209793631U (en) | 2019-04-26 | 2019-04-26 | Pressing ring dismounting device for optical lens group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920586075.0U CN209793631U (en) | 2019-04-26 | 2019-04-26 | Pressing ring dismounting device for optical lens group |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209793631U true CN209793631U (en) | 2019-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920586075.0U Expired - Fee Related CN209793631U (en) | 2019-04-26 | 2019-04-26 | Pressing ring dismounting device for optical lens group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209793631U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109940554A (en) * | 2019-04-26 | 2019-06-28 | 陕西国防工业职业技术学院 | A kind of optics microscope group pressing ring provision for disengagement and eyeglass method for dismounting |
| CN113263465A (en) * | 2021-06-02 | 2021-08-17 | 中科院南京耐尔思光电仪器有限公司 | Adjustable wrench for dismantling lens group pressing ring |
-
2019
- 2019-04-26 CN CN201920586075.0U patent/CN209793631U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109940554A (en) * | 2019-04-26 | 2019-06-28 | 陕西国防工业职业技术学院 | A kind of optics microscope group pressing ring provision for disengagement and eyeglass method for dismounting |
| CN109940554B (en) * | 2019-04-26 | 2024-05-03 | 陕西国防工业职业技术学院 | Optical lens group clamping ring dismounting device and lens dismounting method |
| CN113263465A (en) * | 2021-06-02 | 2021-08-17 | 中科院南京耐尔思光电仪器有限公司 | Adjustable wrench for dismantling lens group pressing ring |
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Granted publication date: 20191217 |