A super-small-size lens coating jig
By designing a fixture with stepped holes higher than the lens surface and setting clamping grooves and high and low side structures, the problem of flipping over during the coating process of ultra-small lenses was solved, achieving stable clamping and removal of lenses, and improving coating efficiency and quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DANYANG ANDUSI OPTICAL COMPONENTS CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-06-09
AI Technical Summary
Existing fixtures often cause the lenses to flip over when coating ultra-small lenses, leading to coating failure. Furthermore, they are difficult to clamp and remove smoothly, increasing the rate of incorrect coating and manufacturing costs.
Design a fixture for coating ultra-small lenses. The top of the stepped hole is higher than the lens surface, and clamping grooves and high and low side structures are set on both sides of the stepped hole to enhance the obstruction of the lens sidewalls and facilitate clamping.
It effectively restricts lens flipping, improves coating quality, ensures smooth lens clamping and removal, reduces coating failure rate, and lowers manufacturing costs.
Smart Images
Figure CN224337705U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of coating technology for ultra-small lenses, and more particularly to a fixture for coating ultra-small lenses. Background Technology
[0002] Lenses are optical elements made of transparent materials (such as glass and resin). Through curved surface design, they control light propagation and can be used for vision correction, ultraviolet protection, high-precision imaging in optical instruments and medical equipment, and applications in scientific research and industry such as laser processing, spectrometers, and fiber optic communication. Coating lenses can increase light transmittance to 99% and reduce reflected light interference; therefore, coating processes are commonly involved in lens manufacturing.
[0003] Currently, for large-sized lenses, such as spectacle lenses and instrument lenses, coating can be performed after clamping them using a fixture. However, for ultra-small lenses used in specialized fields... It is difficult to set up a fixture of the same size for clamping, so currently the method provided in the instruction manual is used. Figure 1-3 The fixture shown has multiple stepped holes evenly distributed on it to fit ultra-small lenses. Before coating, the ultra-small lenses are embedded in each stepped hole. After clamping the fixture as a whole, multiple ultra-small lenses can be coated simultaneously. This not only facilitates the clamping of ultra-small lenses, but also helps to improve the efficiency of coating operations.
[0004] Currently in use Figure 1 When using the fixture shown, to smoothly remove the lens after embedding it into the stepped hole and after coating, the lens surface is higher than the fixture surface after embedding. This means the stepped hole depth is less than the lens thickness, exposing a portion of the lens's sidewall for easy handling with a clamp (such as tweezers). However, because ultra-small lenses have small outer diameters and wall thicknesses, the stepped holes are usually shallow. Furthermore, when the lens has a convex surface, coating within a shallow stepped hole can easily cause the lens to flip, i.e., the lens flips over. Figure 5 (As shown in the image), this can lead to coating failure, preventing the coating process from proceeding smoothly, resulting in a certain rate of incorrect coating and increasing the cost of lens manufacturing. Summary of the Invention
[0005] To address the aforementioned problems, this application aims to provide a fixture for coating ultra-small lenses, which can effectively solve the problem of flipping ultra-small lenses during coating.
[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a fixture for coating ultra-small lenses, wherein the fixture is a circular plate structure with multiple rings of stepped holes for inserting lenses evenly distributed along the circumferential direction, characterized in that: after the lens is inserted into the stepped hole, the fixture surface at the top of the stepped hole is higher than the lens surface, and a clamping structure is provided on the fixture to partially expose the sidewall of the lens.
[0007] Preferably, the clamping structure consists of clamping grooves corresponding to the fixture surfaces on both sides of each stepped hole, wherein the bottom surface of the clamping groove is lower than the fixture surface at the top of the stepped hole.
[0008] Preferably, the clamping grooves of the circumferentially adjacent stepped holes are connected and together form a circumferential groove structure.
[0009] Preferably, each stepped hole is provided with a high side and a low side along the radial direction of the fixture, wherein the high side is higher than the surface after the lens is embedded, and the low side is lower than the surface after the lens is embedded.
[0010] Preferably, a transition slope is provided between the lower side and the radially adjacent higher side.
[0011] The beneficial effects of this application are: the stepped hole on the fixture is higher than the lens thickness, which can effectively block the sidewall of the lens, thereby limiting the problem of lens flipping during the coating operation and improving the coating quality of ultra-small lenses. Furthermore, by creating a clamping groove on the fixture that communicates with the stepped hole, it is convenient to smoothly clamp the lens with tweezers, thus achieving smooth clamping before coating and smooth removal after coating. Attached Figure Description
[0012] Figure 1 This is a planar structural diagram of the fixture currently in use.
[0013] Figure 2 for Figure 1 Cross-sectional structural diagram of the fixture.
[0014] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle.
[0015] Figure 4 In order to be in Figure 3 The image shows a lens being inserted into a stepped hole.
[0016] Figure 5 for Figure 4 The image shows the lens being flipped over during the coating process.
[0017] Figure 6 This is a plan view of the fixture structure in this application.
[0018] Figure 7For this application Figure 6 Enlarged view of the structure at point B in the middle.
[0019] Figure 8 For this application Figure 6 Partial sectional view along line C.
[0020] Figure 9 For this application Figure 8 The diagram shows the placement of a lens in a stepped hole (the arrow indicates the direction in which the tweezers pick up the lens).
[0021] Figure 10 The illustration shows the high and low sides of the stepped hole in this application.
[0022] Figure 11 This is a diagram illustrating the process of placing the lens along its lower side into the stepped hole.
[0023] Figure 12 This illustration shows the increase in fixture thickness and step hole depth caused by the horizontal connection of the lower and higher sides of the radially adjacent stepped holes in this application.
[0024] Figure 13 This application illustrates the transition slope between the high and low sides of adjacent stepped holes.
[0025] Figure 14 This illustration shows the lens of this application being embedded into the stepped hole along the transition slope. Detailed Implementation
[0026] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and embodiments.
[0027] See attached document Figures 1-14 The fixture shown is a jig for coating ultra-small lenses. The jig 1 is a circular plate structure with multiple stepped holes 1a evenly distributed along its circumferential direction for inserting lenses 2. The lenses 2 can be placed in the stepped holes 1a by means of tweezers, and the lenses 2 can be removed after coating is completed.
[0028] To address the problem that the stepped hole 1a currently used for ultra-small lenses is too shallow, causing the lens to easily flip over during the coating process, this application first embeds the lens into the stepped hole 1a, and then the surface of the fixture 1 at the top of the stepped hole 1a is higher than the surface of the lens, increasing the current blocking height of the stepped hole on the side wall of the lens, that is, blocking the entire side wall height of the lens. After deepening the depth of the stepped hole 1a, the flipping of the lens during the coating process can be effectively limited.
[0029] However, when the lens is properly positioned and embedded, the stepped hole 1a covers the lens sidewall, making it difficult to remove the lens smoothly from the stepped hole 1a. Therefore, to solve this problem, the fixture 1 is equipped with a clamping structure that partially exposes the lens sidewall. This clamping structure exposes a portion of the lens sidewall while the sidewall of the stepped hole 1a is still higher than the lens thickness, allowing tweezers to easily grip the lens at this exposed area, thus enabling smooth removal of the coated lens.
[0030] Specifically, such as Figure 6-9 As shown, the clamping structure consists of clamping grooves 1b corresponding to the surfaces of the fixtures 1 on both sides of each stepped hole 1a. The bottom surface of the clamping grooves 1b is lower than the surface of the fixtures 1 at the top of the stepped hole 1a. During lens clamping, after the tweezers pick up the lens and place it inside the stepped hole 1a, the tweezers are positioned in the corresponding clamping grooves 1b on both sides of the stepped hole 1a, facilitating tweezers removal. Similarly, after coating is completed, the tweezers, positioned in the clamping grooves 1b, grip the side of the lens protruding from the clamping grooves 1b, allowing the lens to be easily removed.
[0031] To facilitate the machining and fabrication of the entire jig, such as Figure 6 As shown, preferably, the clamping grooves 1b of the circumferentially adjacent stepped holes 1a are connected and together form an annular groove structure. First, the stepped holes are machined on the surface of the fixture, then the annular grooves are machined, and finally, clamping grooves 1b are formed on both sides of each stepped hole 1a, which facilitates the fabrication and shaping of the fixture.
[0032] Due to the small size of the lens, the precision requirements for coating are higher. Therefore, the positioning accuracy of the lens within the stepped hole 1a is also high. Typically, the clearance between the lens sidewall and the inner wall of the stepped hole is ≤0.05mm. With this clearance, it is difficult to quickly insert the lens into the stepped hole 1a. Figure 10-11 As shown, each stepped hole 1a in the radial direction of the fixture 1 is provided with a high side c1 (i.e., forming a retaining edge for the lens with the inner wall of the stepped hole 1a) and a low side c2. The high side c1 is higher than the surface of the lens after it is embedded (the high side c1 should not be too higher than the lens surface, as this would affect the full-diameter coating of the lens; preferably, it should be 0.03 mm higher than the side surface of the lens), and the low side c2 is lower than the surface of the lens after it is embedded. The high side c1 is used to cover the sidewall of the lens to prevent it from flipping over, while the low side c2 reduces the overlap height with the sidewall of the lens. Figure 11 As shown in the operation, when the lens is lowered from the lower side surface c2 into the stepped hole 1a, the lowering depth of the lens has been reduced compared to lowering it from the higher side surface c1, thus reducing the embedding depth of the lens. Therefore, the lowering and embedding operation of the lens can be completed quickly within a gap margin of ≤0.05mm.
[0033] like Figure 12As shown, since the fixture has multiple rings of stepped holes 1a, each ring of stepped holes has a high side c1 and a low side c2. The high side c1 of the inner (left) adjacent stepped hole connects to the low side c2 of the outer stepped hole. Since there is a height difference between the high side c1 and the low side c2, after setting multiple rings of stepped holes, the height difference between the outermost and innermost stepped holes will further increase. Figure 12 As shown, this not only increases the thickness of the fixture but also increases the depth of the stepped hole. Therefore, to solve this problem, as... Figure 13-14 As shown, a transition slope d is provided between the lower side c2 and the radially adjacent higher side c1. This ensures the lower side c2 of the outer (right side in the figure) stepped hole is connected, while also ensuring that the higher side c1 of the inner stepped hole is horizontally connected to the lower side c2 of the outer stepped hole. This solves the problems of increased fixture thickness and increased stepped hole depth. Furthermore, placing the lens on this transition slope d facilitates its sliding and embedding into the stepped hole.
[0034] The principle of this application is as follows: the stepped hole in the fixture is higher than the thickness of the lens, which can prevent the lens from flipping after it is inserted. At the same time, clamping grooves are provided on both sides of the stepped hole. These clamping grooves are used to expose the sidewall of the lens and to allow the tweezers to grip the lens. Furthermore, a high side c1 and a low side c2 are provided on both sides of the stepped hole, which reduces the difficulty of inserting the lens into the stepped hole due to the small clearance while ensuring the lens is positioned.
[0035] The foregoing has shown and described the basic principles, main features, and advantages of this application. Various changes and modifications may be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.
Claims
1. A fixture for coating ultra-small lenses, wherein the fixture (1) is a circular plate structure with multiple rings of stepped holes (1a) for lens embedding evenly distributed along its circumferential direction, characterized in that: After the lens is inserted into the stepped hole (1a), the surface of the fixture (1) at the top of the stepped hole (1a) is higher than the surface of the lens, and a clamping structure is provided on the fixture (1) to partially expose the sidewall of the lens.
2. The fixture according to claim 1, characterized in that: The clamping structure consists of clamping grooves (1b) corresponding to the surfaces of the fixtures (1) on both sides of each stepped hole (1a), with the bottom surface of the clamping grooves (1b) being lower than the surface of the fixtures (1) at the top of the stepped hole (1a).
3. The fixture according to claim 2, characterized in that: The clamping grooves (1b) of the adjacent stepped holes (1a) in the circumferential direction are connected and together form an annular groove structure.
4. The fixture according to claim 3, characterized in that: Each stepped hole (1a) is provided with a high side (c1) and a low side (c2) along the radial direction of the fixture (1), wherein the high side (c1) is higher than the surface after the lens is embedded, and the low side (c2) is lower than the surface after the lens is embedded.
5. The fixture according to claim 4, characterized in that: A transition slope (d) is provided between the lower side (c2) and the radially adjacent higher side (c1).