A polishing apparatus and system for suppressing aspherical edge effect

Abstract

The application discloses a polishing device and system for inhibiting aspheric edge effect, wherein the polishing device comprises a vacuum adsorption base and an extension ring; the vacuum adsorption base is provided with a lens mounting surface and a connecting structure, and is internally provided with a vacuum adsorption channel; the connecting structure is connected with an external polishing equipment; an adsorption interface of the vacuum adsorption channel is arranged at a non-edge area of the lens mounting surface, and a suction interface is connected with an external negative pressure equipment for forming negative pressure in the vacuum adsorption channel; the lens mounting surface is adsorptively fixed with a to-be-processed aspheric lens through the adsorption interface; the extension ring is mounted on the vacuum adsorption base and comprises an extension surface; the extension surface is formed by milling and grinding of the extension ring and jointly forms a continuous polishing working surface with an edge area of the to-be-processed aspheric lens. The application reduces the influence of polishing edge effect on aspheric lens processing and improves the processing precision and finished product yield of the aspheric lens.

Description

Technical Field

[0001] This invention relates to the field of optical processing technology, and in particular to a polishing apparatus and system for suppressing aspherical edge effects. Background Technology

[0002] With the increasing demand for high-precision aspherical lenses in my country's optical field, achieving deterministic, low-cost, and efficient manufacturing of high-precision aspherical lenses has become increasingly important.

[0003] Currently, the most widely used computer-controlled small-head aspherical contact polishing technology suffers from an unavoidable edge effect problem. Specifically, when polishing to the edge region of the mirror surface, the polishing tool's removal spots cannot completely cover the mirror surface, leading to uneven polishing pressure distribution and abrupt changes in the edge region, thus distorting the polishing removal function. This defect ultimately causes edge warping or collapse on the part.

[0004] This edge effect problem severely restricts the efficiency and accuracy of aspherical polishing and significantly affects the convergence rate of the aspherical polishing process. Summary of the Invention

[0005] The main purpose of this invention is to construct a continuous and smooth polishing surface through negative pressure adsorption and curvature matching, thereby reducing the impact of polishing edge effects on aspherical lens processing and improving the processing accuracy and yield of aspherical lenses.

[0006] The technical solution adopted in this invention is: a polishing device for suppressing aspherical edge effects, comprising a vacuum adsorption base and an extension ring; The vacuum adsorption base has a lens mounting surface and a connecting structure, and has a vacuum adsorption channel inside; wherein, the connecting structure is used to connect to external polishing equipment or milling equipment; the vacuum adsorption channel has an adsorption interface and an air extraction interface, the adsorption interface is located in the non-edge area of ​​the lens mounting surface, and the air extraction interface is connected to an external negative pressure device for forming negative pressure in the vacuum adsorption channel; based on the negative pressure in the vacuum adsorption channel, the lens mounting surface adsorbs and fixes the aspherical lens to be processed through the adsorption interface; The extension ring is mounted on the vacuum adsorption base and includes an extension surface; the curvature of the extension surface matches the curvature of the edge region of the aspherical lens to be processed, so that after milling, the extension surface and the edge region of the aspherical lens to be processed form a continuous polishing surface.

[0007] According to the above technical solution, the vacuum adsorption base is provided with an extension ring reference surface for radial positioning when installing the extension ring.

[0008] According to the above technical solution, the vacuum adsorption base is provided with an extension ring mounting surface that supports the extension ring.

[0009] According to the above technical solution, the extension ring is provided with a fitting bottom surface, and the shape of the fitting bottom surface matches the shape of the extension ring mounting surface of the vacuum adsorption base.

[0010] According to the above technical solution, the vacuum adsorption base is provided with a conical hole for fixing the extension ring.

[0011] According to the above technical solution, the extension ring is provided with a threaded hole corresponding to the conical hole. By screwing a fastener into the conical hole and cooperating with the threaded hole, the extension ring is locked and fixed to the vacuum adsorption base.

[0012] According to the above technical solution, the fastener is an internal hexagonal tapered set screw that mates with the tapered hole.

[0013] According to the above technical solution, the extension ring is provided with a mounting side, which is adapted to the outer peripheral wall of the aspherical lens to be processed.

[0014] According to the above technical solution, the connecting structure of the vacuum adsorption base is a connecting rod, which is fixedly connected to the rotating shaft of an external polishing or milling device.

[0015] Another aspect of the present invention provides a polishing system for suppressing aspherical edge effects, comprising the polishing apparatus described above for suppressing aspherical edge effects.

[0016] The beneficial effects of this invention are as follows: By forming a negative pressure vacuum adsorption channel and a lens mounting surface, the invention stably adsorbs and fixes aspherical lenses. Furthermore, by milling an extension ring mounted on the vacuum adsorption base, an extension surface is formed. This extension surface, together with the edge of the lens to be processed, constitutes a continuous polishing working surface. This transfers the edge effect generated at the lens edge during polishing to the extension ring, effectively ensuring the surface accuracy of the aspherical lens polishing process. Compared to existing technologies that reduce edge effects by reserving extra lens blank allowance and subsequently cutting off the edge, the extension ring of the polishing device of this invention can be reused for lenses of the same specifications, effectively reducing production costs.

[0017] Furthermore, by setting a reference surface for the extension ring, the present invention provides a precise radial positioning reference for the installation of the extension ring, ensuring that the extension ring can be quickly and accurately aligned and installed to the preset position. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the vacuum adsorption base according to an embodiment of the present invention; Figure 2This is a schematic diagram of the structure of the extension ring in an embodiment of the present invention; Figure 3 This is a schematic diagram of the polishing device for suppressing aspherical edge effects according to an embodiment of the present invention.

[0019] Reference numerals: 1. Vacuum adsorption base; 2. Extension ring; 3. Aspherical lens to be processed; 101. Lens mounting surface; 102. Connection structure; 103. Vacuum adsorption channel; 104. Extension ring reference surface; 105. Tapered hole; 106. Extension ring mounting surface; 201. Extension surface; 202. Threaded hole; 203. Fitting bottom surface; 204. Mounting side. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Example 1 This embodiment provides a polishing device for suppressing aspherical edge effects, the specific structure of which is as follows: Figure 3 As shown, it mainly includes a vacuum adsorption base 1 and an extension ring 2.

[0022] The structure of vacuum adsorption base 1 is as follows Figure 1 The diagram shows the basic support and clamping components of this device. One end has a lens mounting surface 101 for supporting the aspherical lens 3 to be processed, and the other end has a connecting structure 102, which contains a vacuum adsorption channel 103. Wherein: The connecting structure 102 is used for fixed connection with the rotating shaft of the milling and polishing equipment. Specifically, in this embodiment, the connecting structure 102 is designed as a cylindrical connecting rod, which is coaxially arranged with the vacuum adsorption base 1. Its outer diameter is adapted to the mounting hole of the rotating shaft of the external polishing and milling equipment, so as to achieve coaxial fastening assembly with the rotating shaft and ensure that the polishing device rotates synchronously and stably with the main shaft of the equipment.

[0023] The vacuum adsorption channel 103 has an adsorption interface located in the non-edge area of ​​the lens mounting surface 101 and an air extraction interface for connecting to an external negative pressure device. Specifically, in this embodiment, the vacuum adsorption channel 103 is a continuous through-hole structure, with one end connected to the adsorption interface located in the non-edge area of ​​the lens mounting surface 101, and the other end extending along the internal axial direction of the vacuum adsorption base 1, penetrating to the outer wall of the vacuum adsorption base 1, forming a complete and sealed airflow passage.

[0024] Based on the negative pressure formed in the vacuum adsorption channel, the lens mounting surface 101 can firmly adsorb and fix the aspherical lens 3 to be processed through the adsorption interface.

[0025] Furthermore, the vacuum adsorption base 1 is provided with an extension ring reference surface 104 for radial positioning when the extension ring 2 is installed.

[0026] Furthermore, the vacuum adsorption base 1 is provided with an extension ring mounting surface 106 for supporting the extension ring 2, providing stable axial support for the extension ring 2.

[0027] Furthermore, the vacuum adsorption base 1 is provided with a conical hole 105 for fixing the extension ring 2.

[0028] Furthermore, the connecting structure of the vacuum adsorption base 1 is a connecting rod 102, which is used to fix and connect with the rotating shaft of an external polishing or milling equipment, thereby realizing the installation of the entire polishing device on the machine tool.

[0029] The structure of extension ring 2 is as follows Figure 2 As shown, this is a key functional component for suppressing edge effects. During milling or polishing, it is mounted on the vacuum adsorption base 1. The core component includes an extension surface 201. The extension surface 201 is formed by milling an extension ring 2. Its curvature matches the curvature of the edge region of the aspherical lens 3 to be processed, and together with the edge region of the aspherical lens 3 to be processed, they form a continuous and smooth polishing surface, thereby transferring the edge effect generated by the polishing tool acting on the lens edge to the extension ring 2.

[0030] Furthermore, the extension ring 2 is provided with a fitting bottom surface 203, the shape of which matches the shape of the extension ring mounting surface 106 of the vacuum adsorption base 1, so as to achieve a stable fit.

[0031] Furthermore, the extension ring 2 is provided with a threaded hole 202 corresponding to the conical hole 105 on the vacuum adsorption base 1. By screwing the fastener into the conical hole 105 and engaging with the threaded hole 202, the extension ring 2 can be locked and fixed on the vacuum adsorption base 1.

[0032] Furthermore, the fastener can be a hexagonal set screw that mates with the tapered hole 105 to ensure a secure connection.

[0033] Furthermore, the extension ring 2 is provided with a mounting side 204, which is adapted to the outer peripheral wall of the aspherical lens 3 to be processed, and can provide auxiliary lateral positioning of the lens during installation.

[0034] Example 2 This embodiment provides a polishing system for suppressing aspherical edge effects, including the polishing device for suppressing aspherical edge effects described in Embodiment 1, and further including a CNC polishing host, a CNC milling machine, and a negative pressure control unit.

[0035] Furthermore, the connection and usage of the CNC polishing host, CNC milling equipment, and negative pressure control unit with the polishing device in Example 1 is as follows: the polishing device is fixedly connected to the rotating shaft of the CNC milling equipment or CNC polishing host through the connection structure 102 of the vacuum adsorption base 1, ensuring that the polishing device and the processing equipment are coaxially assembled and can rotate synchronously; the air extraction interface of the vacuum adsorption base 1 is sealed and connected to the negative pressure control unit, and the negative pressure inside the vacuum adsorption channel 103 is precisely controlled by the negative pressure control unit.

[0036] Furthermore, when the polishing system processes a workpiece, it operates according to the following steps: S1. The vacuum adsorption base 1 is installed on the rotating shaft of the CNC milling machine via the connecting structure 102. The aspherical lens blank 3 to be processed is placed on the lens mounting surface 101, and its side is inspected using a mechanical dial indicator. The lens position is adjusted so that the dial indicator reading is less than 0.01mm to achieve precise centering. Then, the negative pressure control unit is activated, and the negative pressure formed by the vacuum adsorption channel 103 firmly adsorbs the lens blank onto the lens mounting surface 101.

[0037] S2. Install extension ring 2. Place the mating bottom surface 203 of extension ring 2 on the extension ring mounting surface 106 of vacuum adsorption base 1. Adjust the position of extension ring 2 relative to extension ring reference surface 104 to ensure that the side of the aspherical lens blank 3 to be processed fits tightly with the mounting side surface 204 of extension ring 2. Then, screw the hexagonal tapered set screw into the threaded hole 202 of extension ring 2 and mate it with the tapered hole 105 of vacuum adsorption base 1 to securely lock extension ring 2 onto vacuum adsorption base 1.

[0038] S3. Start the CNC milling equipment and mill the aspherical lens 3 blank and the extension ring 2 as a whole, so that the extension ring 2 forms an extension surface 201 with the same edge curvature as the aspherical lens 3.

[0039] S4. After milling is completed, the entire polishing device, including the lens 3 and the extension ring 2, is transferred and installed onto the rotating shaft of the CNC polishing machine. At this time, the extension surface 201 of the extension ring 2 and the edge area of ​​the lens 3 together form a continuous polishing working surface.

[0040] S5. Start the CNC polishing host. Its rotating shaft drives the device to rotate synchronously, and the polishing head polishes along the continuous polishing surface. During this process, the edge effect generated by aspherical polishing is transferred to the extension ring 2 to bear the edge, thereby effectively avoiding edge warping or collapse of the lens itself and ensuring surface accuracy.

[0041] Preferably, after processing, the extension ring 2 can be disassembled and reused for polishing of lenses of the same specification. There is no need to reserve extra lens allowance to suppress edge effect, and the subsequent edge cutting process is also eliminated. While improving processing accuracy and yield, it significantly improves processing efficiency and reduces costs.

[0042] In summary, the present invention provides a polishing apparatus and system for suppressing aspherical edge effects, which can reduce the impact of polishing edge effects on aspherical lens processing and improve the processing accuracy and yield of aspherical lenses.

[0043] The various modules or mechanisms of the system are mainly used to implement the various steps of the above method embodiments, and will not be described in detail here.

[0044] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0045] The sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0046] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A polishing apparatus for suppressing aspherical edge effects, characterized in that, Includes a vacuum adsorption base (1) and an extension ring (2); The vacuum adsorption base (1) is provided with a lens mounting surface (101) and a connecting structure (102), and is provided with a vacuum adsorption channel (103) inside; wherein, the connecting structure (102) is used to connect external polishing equipment or milling equipment; the vacuum adsorption channel (103) has an adsorption interface and an air extraction interface, the adsorption interface is located in the non-edge area of ​​the lens mounting surface (101), and the air extraction interface is connected to an external negative pressure device for forming a negative pressure in the vacuum adsorption channel (103); when there is a negative pressure in the vacuum adsorption channel (103), the lens mounting surface (101) adsorbs and fixes the aspherical lens (3) to be processed through the adsorption interface. The extension ring (2) is mounted on the vacuum adsorption base (1) and includes an extension surface (201); the extension surface (201) is formed by milling the extension ring (2) and together with the edge area of ​​the aspherical lens (3) to be processed, forms a continuous polishing surface.

2. The polishing apparatus for suppressing aspherical edge effects according to claim 1, characterized in that, The vacuum adsorption base (1) is provided with an extension ring reference surface (104) for radial positioning when the extension ring (2) is installed.

3. The polishing apparatus for suppressing aspherical edge effects according to claim 1, characterized in that, The vacuum adsorption base (1) is provided with an extension ring mounting surface (106) for supporting the extension ring (2).

4. The polishing apparatus for suppressing aspherical edge effects according to claim 3, characterized in that, The extension ring (2) is provided with a bottom surface (203), the shape of which matches the shape of the extension ring mounting surface (106) of the vacuum adsorption base (1).

5. The polishing apparatus for suppressing aspherical edge effects according to claim 1, characterized in that, The vacuum adsorption base (1) is provided with a conical hole (105) for fixing the extension ring (2).

6. The polishing apparatus for suppressing aspherical edge effects according to claim 5, characterized in that, The extension ring (2) is provided with a threaded hole (202) corresponding to the conical hole (105); the extension ring (2) is fixed to the vacuum adsorption base (1) by a fastener that is screwed into the threaded hole (202) and abuts against the conical hole (105).

7. The polishing apparatus for suppressing aspherical edge effects according to claim 6, characterized in that, The fastener is an internal hexagonal tapered set screw that mates with the tapered hole (105).

8. The polishing apparatus for suppressing aspherical edge effects according to claim 1, characterized in that, The extension ring (2) is provided with a mounting side (204), which is adapted to the outer peripheral wall of the aspherical lens (3) to be processed.

9. The polishing apparatus for suppressing aspherical edge effects according to claim 1, characterized in that, The connecting structure (102) of the vacuum adsorption base (1) is a connecting rod, which is used to fix the rotating shaft of the external polishing equipment or milling equipment.

10. A polishing system for suppressing aspherical edge effects, characterized in that, A polishing apparatus for suppressing aspherical edge effects as described in any one of claims 1-9.

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