Jig for centering measurement of thermoformed lens
By designing a fixture for centering measurement of thermoformed lenses, using the concentric centering method of measuring bumps and tabs, the problem of difficulty in accurately finding the center point when detecting biconcave lenses, etc. is solved, more efficient measurement and lower errors are achieved, and the surface damage of the lens is avoided.
Patent Information
- Application Number
- CN202422181850.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-06
AI Technical Summary
When detecting the center thickness of biconcave lenses, planoconcave lenses and meniscus lenses, it is difficult for the prior art to accurately find the center point of the lens, resulting in large measurement errors, and the dial is prone to cause scars to the lens surface during the measurement process.
A thermoformed lens centering measurement fixture is designed. By supporting the lens by measuring bumps, and using the measuring bumps concentrically and centering method of measuring bumps, the lens is adjusted to the center position of the fixture by itself, reducing centering operations and improving measurement efficiency.
It effectively reduces measurement errors, improves measurement efficiency, and prevents surface damage of lenses, meeting the industry's standards for errors within 0.002mm.
Smart Images
Figure CN222978749U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a fixture for centering measurement of hot - formed lenses. Background Art
[0002] When detecting the center thickness of a double - convex lens DCX and a plano - convex lens PCX, a double - flat dial with flat heads on both the upper and lower sides is used to find the highest point of the lens, and direct measurement can be carried out. During the measurement process, it is also relatively stable, and the measurement error of this method is within 0.002 mm. However, when detecting the center thickness of a double - concave lens DCV, a plano - concave lens PCV, and a meniscus lens MNL, the double - pointed dial used needs to find the lowest point of the lens. Since such lenses have at least one surface with an R value, it is not easy to find the center point during measurement, and an error of 0.005 - 0.015 mm is easily generated, seriously exceeding the industry standard of an error within 0.002 mm, and ultimately resulting in a deviation in the imaging effect of the terminal lens. Only some old employees with more than three years of rich experience have a relatively small error during measurement, but there is still a certain degree of instability. On the other hand, when looking for the center point, the dial will move back and forth and left and right on the lens surface, which is extremely likely to cause scratches on the lens surface and increase the defect rate of the appearance. Therefore, a measurement fixture with a simple structure and the ability to center is provided. Summary of the Utility Model
[0003] The purpose of the present utility model is to address the above - mentioned problems existing in the prior art and propose a fixture for centering measurement of hot - formed lenses. By measuring the convex block supporting the lens and then centering the measurement convex piece and the measurement convex block in a concentric manner, the lens can be self - aligned to the center position of the fixture, thereby improving the measurement efficiency.
[0004] The purpose of the present utility model can be achieved by the following technical solutions: A fixture for centering measurement of hot - formed lenses, characterized in that it includes:
[0005] A measurement upper cover, which has a circular hole in the middle and is provided with a number of measurement convex pieces protruding inward;
[0006] A measurement base, which is cylindrical and has a circular groove recessed inward at the upper end;
[0007] A measurement convex block for placing the lens to be measured is provided in the middle of the circular groove. The measurement upper cover is in the shape of a round cap and the measurement upper cover is sleeved on the upper end of the measurement base. When the measurement upper cover and the measurement base are assembled, the measurement convex block is located directly below the measurement convex piece.
[0008] Further, a cross - slot is opened at the upper end of the measurement upper cover with the circular hole as the center.
[0009] Further, the cross - slot divides the circular hole into four parts and corresponds to four measurement convex pieces. The front cross - section of the 4 measurement convex pieces is conical, and the angle is 60°.
[0010] Further, a through hole runs through the middle of the measuring bump, and the upper end of the measuring bump is conical with an angle of 60°.
[0011] Further, a small suction cup is provided at the end of the measuring bump. A suction pipe passes downward through the through hole from the inner end of the small suction cup, and a suction pump is provided at the outer end of the suction pipe.
[0012] Further, a gasket having the same shape as the end of the measuring tab is sleeved on the end of the measuring tab.
[0013] Further, the side surface of the measuring base has friction lines.
[0014] Compared with the prior art, the advantages of this application are as follows: The lens is supported by the measuring bump, and then the lens is self-aligned to the center position of the jig by the concentric centering method of the measuring tab and the measuring bump, improving the measuring efficiency. Description of the Drawings
[0015] Figure 1 is a schematic diagram of the jig;
[0016] Figure 2 is a schematic diagram of the measuring base;
[0017] Figure 3 is a schematic diagram of the measuring upper cover;
[0018] Figure 4 is a sectional view of the measuring upper cover;
[0019] Figure 5 is a sectional view of the measuring base;
[0020] In the figure, 1. Measuring upper cover; 11. Cross slot; 12. Round hole; 13. Measuring tab; 14. Gasket; 2. Measuring base; 21. Circular wipe; 22. Measuring bump; 23. Through hole; 24. Small suction cup; 25. Suction pipe; 26. Suction pump. Detailed Description of the Invention
[0021] The following are specific embodiments of the present invention in combination with the accompanying drawings to further describe the technical solutions of the present invention.
[0022] As Figures 1-5 shown, a jig for thermoforming lens centering measurement, characterized in that it comprises:
[0023] A measuring upper cover 1, having a round hole 12 in the middle and several measuring tabs 13 protruding inward;
[0024] A measuring base 2, which is cylindrical and has a circular groove 21 recessed inward at the upper end;
[0025] A measuring bump 22 for placing the lens to be measured is provided in the middle of the circular groove 21. The measuring upper cover 1 is in the shape of a round cap and is sleeved on the upper end of the measuring base 2. When the measuring upper cover 1 is assembled with the measuring base 2, the measuring bump 22 is located directly below the measuring tab 13.
[0026] In this application, the lens to be measured is placed on the measuring bump 22 in the measuring base 2, and the measuring upper cover 1 is sleeved into the base. By using the up and down movement to contact the lens and the concentric centering method, the lens is automatically aligned to the center position of the jig, reducing the centering operation during the measurement process, improving the measurement efficiency, and facilitating the subsequent measurement of the centered lens.
[0027] In this utility model, through the precise fit of the inner and outer diameters of the measuring upper cover 1 and the measuring base 2 of the jig, the lens is supported against the arc surface in the jig, and the centering effect is achieved by the upper and lower concentric positions of the jig, greatly improving the measurement efficiency.
[0028] Further, a cross groove 11 is provided at the upper end of the measuring upper cover 1 centered on the round hole 12. The cross groove 11 is convenient for observing the inside.
[0029] Further, the cross groove 11 divides the round hole 12 into four parts and correspondingly has four measuring tabs 13. The front end cross section of the 4 measuring tabs 13 is conical, and the angle is 60°. The 4 measuring tabs 13 are used to center the lens.
[0030] Further, a through hole 23 runs through the middle of the measuring bump 22. The upper end of the measuring bump 22 is conical and the angle is 60°.
[0031] Further, a small suction cup 24 is provided at the end of the measuring bump 22. A suction pipe 25 is provided at the inner end of the small suction cup 24 and passes downward through the through hole 23. An air suction pump 26 is provided at the outer end of the suction pipe 25. After centering, the lens is sucked by the small suction cup 24 for the next measurement.
[0032] Further, a gasket 14 having the same shape as the end of the measuring tab 13 is sleeved on the end of the measuring tab 13. The gasket 14 serves as a medium between the measuring tab 13 and the lens during the up and down movement of the measuring tab 13, protecting the surface of the lens and preventing scratches.
[0033] Further, the side surface of the measuring base 2 has friction lines. The friction lines make the measuring upper cover 1 move up and down more slowly due to friction, reducing the force exerted by the measuring tab 13 on the lens to be measured.
[0034] The above technical solution of this utility model provides a solution significantly different from the prior art for the technical problem that the prior art solution is too single. The parts not involved in the technical solution of this application are the same as the prior art or can be implemented by the prior art, and will not be elaborated here.
[0035] The technical solutions in the above embodiments have clearly and completely described the content of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
Claims
1. A jig for centering and measuring thermoformed lenses, characterized in that it include: The measuring cover has a circular hole in the middle and a plurality of measuring protrusions protruding inwards; The measuring base is cylindrical and has an inwardly concave circular groove at the upper end; A measuring convex block for placing the measured lens is arranged in the middle of the circular groove. The measuring upper cover is in the shape of a round cap and is sleeved on the upper end of the measuring base. When the measuring upper cover and the measuring base are assembled, the measuring convex block is located directly below the measuring convex piece.
2. A jig for centering and measuring thermoformed lenses according to claim 1, characterized in that: A cross groove is provided at the upper end of the measuring upper cover with the circular hole as the center.
3. A jig for centering and measuring thermoformed lenses according to claim 2, characterized in that: The cross groove divides the circular hole into four parts and has four corresponding measuring protrusions. The front end cross-sections of the four measuring protrusions are conical with an angle of 60°.
4. The jig for centering and measuring thermoformed lenses according to claim 1, characterized in that: The middle of the measuring protrusion is provided with a through hole, and the upper end of the measuring protrusion is conical with an angle of 60°.
5. A jig for centering and measuring thermoformed lenses according to claim 4, characterized in that: The end of the measuring convex block is provided with a small suction cup, the inner end of the small suction cup is downwardly passed through the through hole and provided with a suction pipe, and the outer end of the suction pipe is provided with an air suction pump.
6. The jig for centering and measuring thermoformed lenses according to claim 1, characterized in that: The end of the measuring lug is sleeved with a sleeve pad having the same shape as the end of the measuring lug.
7. The jig for centering and measuring thermoformed lenses according to claim 1, characterized in that: The side surface of the measuring base is provided with friction lines.