Optical coating device suitable for lens with hole in center
By designing an optical coating device suitable for centrally perforated lenses, and employing a support structure consisting of a conical block, a central rod, and flexible components, the problem of high-temperature lens deformation was solved, achieving efficient coating and improved safety, and adapting to the versatility of different lenses.
Patent Information
- Application Number
- CN202511325331.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2026-01-20
AI Technical Summary
Existing technologies lack support devices suitable for optical lenses with a central hole and both upper and lower surfaces requiring coating, which leads to lens deformation or breakage during high-temperature coating, affecting coating effectiveness and safety.
An optical coating device suitable for centrally perforated lenses has been designed. It adopts a support mechanism consisting of a conical block, a central rod, and a flexible component. Through tapered matching and flexible connection, it provides flexible support to reduce high-temperature deformation stress. The device includes a combination structure of a conical block, a central rod, a flexible component, and a limiting plate.
Under high-temperature coating conditions, it reduces lens deformation, improves coating yield and productivity, and is easy to install and disassemble, adapting to lenses with different inner diameters and qualities, thus improving versatility.
Smart Images
Figure CN121362942A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of machinery, in particular to an optical coating device. BACKGROUND
[0002] Optical coating refers to depositing a layer (or multiple layers) of thin film on the surface of an optical part in a vacuum state by evaporation deposition to improve its optical performance. The temperature in the coating process can reach up to 300℃, and the thermal expansion coefficients of the lens and the clamping tool material are inconsistent (usually the clamping tool is made of metal material, and the thermal expansion coefficient is 5-10 times that of the optical lens). After high-temperature expansion, mutual extrusion may occur, which generates a large clamping stress on the lens, especially the deformation is transmitted to the optical lens, which deforms the optical surface of the lens, resulting in poor coating effect. In severe cases, the optical lens may be broken and damaged, causing serious economic losses.
[0003] At present, there is a lack of a coating device suitable for supporting an optical lens with a hole in the center and both upper and lower surfaces to be coated. SUMMARY
[0004] The present application provides an optical coating device suitable for a lens with a hole in the center to solve at least one of the above technical problems.
[0005] An optical coating device suitable for a lens with a hole in the center, comprising a supporting mechanism for supporting the lens, characterized in that the supporting mechanism comprises a conical block, a center rod and a flexible assembly.
[0006] The taper of the outer wall of the conical block matches the taper of the central inner hole of the lens, and at least three circumferentially arranged mounting hole positions for mounting the flexible assembly are formed on the conical block.
[0007] The flexible assembly comprises a first steel ball, a flexible piece and a second steel ball connected in sequence.
[0008] The center rod is threadedly connected with the conical block, and the center rod is provided with an abutting portion for abutting against the flexible assembly.
[0009] The first steel ball is used to abut against the central inner hole of the lens, and the second steel ball is used to abut against the abutting portion.
[0010] Further preferably, a recessed annular recess is formed in the hollow rod, and the annular recess is located above the abutting portion.
[0011] The annular recess is used to locally accommodate the inner side of the flexible assembly.
[0012] Further preferably, the conical block is provided with a threaded hole, a conical hole part with an increasing inner diameter from top to bottom, and a ring groove part sequentially connected and communicated with each other from top to bottom in the center of the conical block;
[0013] The inner diameter of the ring groove part is greater than the maximum inner diameter of the conical hole.
[0014] The inner diameter of the threaded hole is less than the minimum inner diameter of the conical hole.
[0015] Further preferably, a limiting plate is further provided, and the limiting plate is longitudinally movably connected with the bottom of the center rod.
[0016] The limiting plate is located in the ring groove part.
[0017] The threaded hole is threadedly connected with the center rod.
[0018] The abutting part is located in the conical hole part.
[0019] Further preferably, a limiting plate is further provided, and the limiting plate is provided with an extending rod extending upward in the center.
[0020] The center rod is threadedly connected with the extending rod.
[0021] The bottom of the conical block is provided with a limiting groove for limiting the limiting plate.
[0022] Alternatively, a limiting plate is further provided, and the limiting plate is fixedly connected with the bottom of the conical block.
[0023] The limiting plate is provided with an extending rod extending upward in the center.
[0024] The bottom of the center rod is provided with a blind hole for slidingly connecting the extending rod, and a spring is clamped between the hollow rod and the limiting plate.
[0025] Further preferably, the bottom of the hollow rod is provided with a spring limiting part for sleeving the spring.
[0026] The spring is clamped between the limiting plate and the spring limiting part.
[0027] Further preferably, the center axis of the mounting hole is perpendicular to the outer wall of the abutting part.
[0028] Further preferably, the abutting part is in a cylindrical shape, and the axial direction of the mounting hole is horizontally arranged.
[0029] Alternatively, the abutting part is in a conical shape with a narrow upper part and a wide lower part, and the length direction of the center axis of the mounting hole is upwardly inclined from inside to outside.
[0030] Beneficial effects:
[0031] The present application can provide flexible support for optical lenses with holes in the middle and no support plane provided by the lens periphery under high-temperature (300℃ or higher) coating conditions, reduce clamping stress caused by high-temperature deformation, thereby improving lens surface shape, increasing optical lens coating yield and productivity; in addition, the high-precision coating device can be easily disassembled and assembled through threaded cooperation and flexible connection, and can be adapted to optical lenses with different inner diameters and different masses, and has strong versatility. BRIEF DESCRIPTION OF DRAWINGS
[0032] Figure 1 is a sectional view in the axial direction of embodiment 1 of the present application;
[0033] Figure 2 is a sectional view in the radial direction of embodiment 1 of the present application;
[0034] Figure 3 is a sectional view of an optical lens of embodiment 1 of the present application;
[0035] Figure 4 is a sectional view of embodiment 1 of the present application;
[0036] Figure 5 is a structural schematic view of a support mechanism of embodiment 1 of the present application;
[0037] Figure 6 is an exploded view of embodiment 1 of the present application;
[0038] Figure 7 is a sectional view of embodiment 2 of the present application;
[0039] Figure 8 is an exploded view of embodiment 2 of the present application;
[0040] Figure 9 is a sectional view of embodiment 3 of the present application;
[0041] Figure 10 is an exploded view of embodiment 3 of the present application;
[0042] Figure 11 is a force schematic view of the second steel ball in embodiment 2 of the present application.
[0043] In the figure: 1 is an optical lens, 2 is a conical block, 3 is a center rod, 4 is a flexible component, 5 is a limiting plate, 41 is a first steel ball, 42 is a flexible piece, and 43 is a second steel ball. DETAILED DESCRIPTION
[0044] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.
[0045] Please refer to Figures 1 to 6 As shown in the drawings, in specific embodiment 1, an optical coating device suitable for a central hole lens 1 comprises a supporting mechanism for supporting the lens 1, the supporting mechanism comprising a tapered block 2, a central rod 3 and a flexible assembly 4; the taper of the outer wall of the tapered block 2 matches the taper of the central inner hole of the lens 1, and at least three installation hole positions for installing the flexible assembly 4 are arranged on the tapered block 2 in a circumferential direction; the flexible assembly 4 comprises a first steel ball 41, a flexible piece 42 and a second steel ball 43 connected in sequence; the central rod 3 is threadedly connected with the tapered block 2, and the central rod 3 is provided with a contact portion for abutting against the flexible assembly 4; the first steel ball 41 is used for abutting against the central inner hole of the lens 1, and the second steel ball 43 is used for abutting against the contact portion.
[0046] The hollow rod is provided with an inner concave annular inner concave portion, and the annular inner concave portion is located above the contact portion; the annular inner concave portion is used for locally accommodating the inner side of the flexible assembly 4. The inner diameter of the annular inner concave portion is smaller than the outer diameter of the minimum outer diameter position of the contact portion.
[0047] The central part of the tapered block 2 is provided with a threaded hole, a hole portion and a ring groove portion connected in sequence from top to bottom and communicated with each other; the inner diameter of the ring groove portion is greater than the lower end inner diameter of the hole portion; and the inner diameter of the threaded hole is smaller than the upper end inner diameter of the hole portion.
[0048] The central axis direction of the installation hole position is perpendicular to the outer wall of the contact portion.
[0049] The contact portion can be in a cylindrical shape, and the axial direction of the installation hole position is horizontally arranged.
[0050] Further comprising a limiting plate 5, the limiting plate 5 is longitudinally movably connected with the bottom of the central rod 3; the limiting plate 5 is located in the ring groove portion; the threaded hole is threadedly connected with the central rod 3; and the contact portion is located in the hole portion. The limiting plate 5 is longitudinally movably connected with the bottom of the central rod 3. The limiting plate 5 can be threadedly connected with the central rod 3.
[0051] Please refer to Figure 7 and Figure 8 In specific embodiment 2, on the basis of specific embodiment 1, the difference lies in that the central part of the tapered block 2 is provided with a threaded hole, a tapered hole portion with an increasing inner diameter from top to bottom and a ring groove portion connected in sequence from top to bottom and communicated with each other; the inner diameter of the ring groove portion is greater than the maximum inner diameter position of the tapered hole; and the inner diameter of the threaded hole is smaller than the minimum inner diameter position of the tapered hole.
[0052] A limiting plate 5 is further included, the central part of the limiting plate 5 is provided with an upwardly extending extension rod; the central rod 3 is threadedly connected with the extension rod; the bottom of the conical block 2 is provided with a limiting groove for limiting the limiting plate 5. The limiting plate 5 is located in the annular groove part.
[0053] The abutting part is a taper with a narrow upper part and a wide lower part, and the length direction of the central axis of the mounting hole is upwardly inclined from inside to outside.
[0054] The outer thread of the extension rod is connected with the bottom inner threaded hole of the central rod 3.
[0055] After the central rod 3 is screwed into the threaded hole of the conical block 2, the limiting plate 5 is connected with the central rod 3 through thread cooperation, and the flexible assembly 4 is installed into the corresponding mounting hole of the conical block 2; then the central rod 3 is reversely rotated, the central rod 3 drives the limiting plate 5 to move upwardly until the limiting surface of the limiting plate 5 is attached to the conical block 2, and the upward movement is stopped.
[0056] At this time, the flexible assembly 4 close to the central rod 3 side is tangent to the abutting part, the flexible assembly is forced to move outwardly, and the assembly of the supporting mechanism is completed.
[0057] Then, the supporting mechanism is inserted into the central hole of the lens 1 from bottom to top until the first steel ball 41 on the outer side of the flexible assembly is tangent to the wall of the central hole of the lens 1 and is limited, and the movement is stopped, and the fixing of the lens 1 is completed.
[0058] Referring to Figure 11 , the force analysis diagram of the first steel ball 41 of the flexible assembly, the steel ball is pressed by the inner wall of the lens, the conical block provides a vertical upward supporting force Fm, and the flexible assembly elastically deforms to generate a force Fr. When the forces are balanced:
[0059] N*Fr*tanα=mg;
[0060] Fr=k*Δx;
[0061] Fn=mg / sinα / N;
[0062] Therefore: N* k*Δx=mg / tanα;
[0063] (wherein m is the mass of the lens, N is the number of the flexible assembly, Δx is the deformation amount of the flexible assembly, and k is the stiffness of the flexible assembly).
[0064] According to the formula, uniformly distributing multiple flexible assemblies can uniformly stress the inner hole wall of the optical lens at multiple positions, reduce the contact stress, and improve the surface shape of the optical lens.
[0065] During the coating process, the overall temperature rises, and the lens expands due to heating, and its inner hole shrinks inward; the corresponding flexible assembly is stressed and moves inward until the stress balance is achieved. Thus, the deformation of the optical lens is offset, and the influence of high-temperature thermal stress is eliminated.
[0066] After the coating is completed, the center rod 3 is rotated to move the limiting plate 3 downward, the second steel ball on the inner side of the flexible assembly slides into the annular inner recess of the center rod, the outer side of the flexible assembly is separated from the inner hole wall of the lens, and the supporting mechanism as a whole moves downward to leave the lens 1, thereby completing the disassembly of the lens 1 and the supporting mechanism.
[0067] Referring to Figure 9 and Figure 10 , in specific embodiment 3, based on specific embodiment 1, the difference lies in further comprising a limiting plate 5, the limiting plate 5 is fixedly connected with the bottom of the tapered block 2; the limiting plate 5 is provided with an upward extending extension rod in the center; the bottom of the center rod 3 is provided with a blind hole for slidingly connecting the extension rod, and a spring is clamped between the hollow rod and the limiting plate 5. The bottom of the hollow rod is provided with a spring limiting portion for sleeving the spring; the spring is clamped between the limiting plate 5 and the spring limiting portion.
[0068] The spring maintains a certain compression amount in the initial state to achieve pre-tightening. The cooperation of the tapered surface of the center rod 3 and the spring can adjust the elastic deformation amount of the flexible assembly 4, thereby adapting to lenses 1 of different masses. When the mass of the lens 1 increases, the center rod 3 is adjusted to move upward through the thread, the elastic deformation amount of the flexible assembly increases, and force balance is achieved. Conversely, when the mass of the lens 1 decreases, the center rod 3 is adjusted to move downward through the thread, the elastic deformation amount of the flexible assembly decreases, and force balance is achieved. Similarly, optical lenses of various center hole diameters can be adapted. When the hole diameter of the lens 1 increases, the center rod 3 is adjusted to move upward through the thread, the elastic deformation amount of the flexible assembly increases, and force balance is achieved. Conversely, when the hole diameter of the lens 1 decreases, the center rod 3 is adjusted to move downward through the thread, the elastic deformation amount of the flexible assembly decreases, and force balance is achieved.
[0069] The abutting portion is a tapered shape with a narrow upper part and a wide lower part, and the central axis of the mounting hole is inclined upward from inside to outside.
[0070] The lower part of the tapered block at the mounting hole is a cylindrical structure. The upper part of the tapered block at the mounting hole is a tapered zone with a narrow upper part and a wide lower part. The central part of the tapered block 2 is provided with a threaded hole, a tapered hole portion with an increasing inner diameter from top to bottom, and a ring groove portion connected in sequence from top to bottom and mutually communicated; the inner diameter of the ring groove portion is greater than the maximum inner diameter of the tapered hole; the inner diameter of the threaded hole is less than the minimum inner diameter of the tapered hole.
[0071] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.
[0072] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.
Claims
1. An optical coating apparatus suitable for use with a central-holed lens comprising a support mechanism for supporting the lens, characterised in that, The supporting mechanism comprises a conical block, a center rod and a flexible assembly; The conical block is provided with at least three circumferentially arranged mounting hole positions for mounting the flexible assembly; The flexible assembly comprises a first steel ball, a flexible piece and a second steel ball connected in sequence; The center rod is threadedly connected with the conical block, and the center rod is provided with an abutting portion for abutting against the flexible assembly; The first steel ball is used for abutting against the inner hole of the center of the lens, and the second steel ball is used for abutting against the abutting portion.
2. An optical coating apparatus suitable for use with a central-holed lens according to claim 1, wherein: The hollow rod is provided with an annular concave portion, which is located above the abutting portion; The annular concave portion is used for locally accommodating the inner side of the flexible assembly.
3. The optical coating apparatus suitable for a central-holed lens according to claim 1, wherein: The conical block is provided with a threaded hole, a conical hole portion and a ring groove portion connected in sequence from top to bottom and communicated with each other; The inner diameter of the ring groove portion is greater than the maximum inner diameter of the conical hole; The inner diameter of the threaded hole is less than the minimum inner diameter of the conical hole.
4. An optical coating apparatus suitable for use with a central hole mirror according to claim 3, wherein: Further comprising a limiting plate, the limiting plate is longitudinally movably connected with the bottom of the center rod; The limiting plate is located in the ring groove portion; The threaded hole is threadedly connected with the center rod; The abutting portion is located in the conical hole portion.
5. The optical coating apparatus suitable for a central-holed lens according to claim 1, wherein: Further comprising a limiting plate, the limiting plate is provided with an upwardly extending extension rod in the center thereof; The center rod is threadedly connected with the extension rod; The bottom of the conical block is provided with a limiting groove for limiting the limiting plate.
6. The optical coating apparatus suitable for a central-holed lens according to claim 1, wherein: Further comprising a limiting plate, the limiting plate is fixedly connected with the bottom of the conical block; The limiting plate is provided with an upwardly extending extension rod in the center thereof; The bottom of the center rod is provided with a blind hole for slidingly connecting the extension rod, and a spring is clamped between the hollow rod and the limiting plate.
7. An optical coating apparatus suitable for use with a centrally holed lens according to claim 6, wherein: The bottom of the hollow rod is provided with a spring limiting portion for sleeving the spring; The spring is clamped between the limiting plate and the spring limiting portion.
8. The optical coating apparatus suitable for a central-holed lens according to claim 1, wherein: The center axis direction of the mounting hole position is perpendicular to the outer wall of the abutting portion.
9. The optical coating apparatus suitable for a central-holed lens according to claim 1, wherein: The abutting portion is cylindrical, and the axial direction of the mounting hole position is horizontally arranged.
10. The optical coating apparatus suitable for a central-holed lens according to claim 1, wherein: The abutting portion is tapered with the upper part being narrow and the lower part being wide, and the length direction of the center axis of the mounting hole position is upwardly inclined from inside to outside.