Adaptive optics lens edge polishing head

Abstract

The utility model provides a kind of self-adapting optical lens edge polishing head, it is related to optical lens polishing device technical field, it includes pedestal, pedestal top is fixedly connected with external polishing machine main shaft, pedestal bottom is fixedly provided with main polishing disc, pedestal bottom is hingedly connected with the sub-polishing ring of main polishing disc by ball hinge, sub-polishing ring is set apart with main polishing disc, sub-polishing ring outer wall is provided with the guide camber concentric with hinged point, pedestal bottom is also provided with elastic element, and elastic element and sub-polishing ring top are elastically contacted, and main polishing disc and sub-polishing ring bottom are fixed with the polishing pad of coplanar;By the self-adapting deflection adjustment of sub-polishing ring around ball hinge and the continuous pressure compensation provided by elastic element, polishing pad can also maintain uniform and stable contact state in lens edge area, so as to significantly improve lens edge polishing pressure distribution, inhibit the pressure imbalance caused by pad body deformation, improve lens edge surface precision and consistency.

Description

Technical Field

[0001] This utility model relates to the technical field of optical lens polishing devices, and in particular to an adaptive optical lens edge polishing head. Background Technology

[0002] Optical lens polishing is a precision manufacturing process that uses the relative movement of a polishing pad and the lens surface under pressure, along with the chemical action of a polishing fluid and mechanical grinding, to remove minute amounts of material, thereby processing the lens surface to a smooth plane or curved surface and precisely correcting its shape. The core is to ensure that the polishing pad and each area of ​​the lens surface maintain a uniform and stable contact pressure.

[0003] Existing technologies generally employ an integral polishing disc structure, covering a polishing pad on a rigid or flexible substrate. A spindle drives the disc to rotate and apply constant pressure to the lens surface. However, while this structure performs well in polishing the central region of the lens, when it contacts the lens edge, the lack of support outside the edge causes the flexible polishing pad to deform outwards under pressure. This results in stress concentration at the edge of the polishing disc, leading to non-uniform elastic warping. This deformation alters the actual contact area and contact posture between the polishing pad and the lens edge, causing the pressure per unit area at the edge to differ from other areas. This uneven pressure distribution easily leads to uncontrolled material removal at the edge, ultimately resulting in deterioration of the lens edge surface accuracy, forming surface defects such as edge collapse or warping, affecting the final optical quality of the lens. These problems are particularly pronounced when dealing with lenses that have surface errors in the initial processing. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an adaptive optical lens edge polishing head, which solves the problem that existing technologies lack support when the edge of the flexible polishing pad is pressed, easily causing uneven force in the edge area, and ultimately leading to the deterioration of the surface accuracy of the lens edge.

[0005] According to an embodiment of the present invention, an adaptive optical lens edge polishing head includes a base, the top of which is fixedly connected to the main shaft of an external polishing machine, a main polishing disk fixedly disposed at the bottom of the base, and a secondary polishing ring surrounding the main polishing disk being hinged at the bottom of the base via a ball joint. The secondary polishing ring is spaced apart from the main polishing disk, and a guide arc surface concentric with the hinge point is provided on the outer wall of the secondary polishing ring. An elastic element is also provided at the bottom of the base, which elastically abuts against the top of the secondary polishing ring. Coplanar polishing pads are fixed at the bottom of the main polishing disk and the secondary polishing ring.

[0006] The technical principle of this utility model is as follows: When the polishing head acts on the edge area or surface undulation area of ​​the lens, the secondary polishing ring contacts the lens surface through the bottom polishing pad. The reaction force generated by the local contour of the lens on the secondary polishing ring causes it to adaptively deflect around the center of the ball joint to conform to the surface change. At the same time, this force pushes the secondary polishing ring to move slightly upward and compress the elastic element. The elastic element generates a corresponding rebound force based on the deformation and continues to act on the secondary polishing ring, so that it maintains stable dynamic support and constant contact pressure on the edge of the lens, thereby suppressing the deformation of the polishing pad and abnormal pressure distribution caused by edge loss of support or surface error.

[0007] Furthermore, a connecting plate is fixedly provided in the middle of the secondary polishing ring, a ball head is fixedly connected to the top of the connecting plate, and a ball seat hinged to the ball head is fixedly provided at the bottom of the base.

[0008] Furthermore, a number of connecting columns are fixedly installed at the bottom of the base, and the connecting columns are fixedly connected to the top of the main polishing disc. The connecting plate is provided with clearance holes for the connecting columns to pass through.

[0009] Furthermore, a limiting shell is provided around the outer edge of the bottom of the base, and the inner wall of the limiting shell is set as a guide arc surface concentric with the ball head. The outer wall of the secondary polishing ring is separated from the inner wall of the limiting shell.

[0010] Furthermore, the outer wall of the limiting shell is provided with a threaded hole, wherein a first rotating rod is threadedly connected, and the side wall of the secondary polishing ring is provided with a limiting hole into which the first rotating rod can be screwed.

[0011] Furthermore, the elastic element includes springs, with several springs fixedly arranged around the bottom of the base, and an anti-deviation post fixedly arranged inside any spring.

[0012] Furthermore, the elastic element includes a ring plate and several springs fixed around the bottom of the ring plate. A sliding cavity for the ring plate to slide up and down is provided in the base. A threaded hole is provided at the top of the base, wherein a second rotating rod is threadedly connected and the bottom of the second rotating rod is rotatably connected to the top of the ring plate.

[0013] Furthermore, the top of the secondary polishing ring is radially surrounded by several sliding grooves, and a sliding post is slidably disposed in any sliding groove. The number of sliding posts corresponds to the number of springs. The bottom of the base is surrounded by several through holes communicating with the sliding cavity, and the limiting post abuts against the bottom of the spring in the through holes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: through the adaptive deflection adjustment of the secondary polishing surrounding ball joint and the continuous pressure compensation provided by the elastic element, the polishing pad can maintain a uniform and stable contact state in the lens edge area, thereby significantly improving the polishing pressure distribution at the lens edge, suppressing the pressure imbalance caused by pad deformation, and improving the accuracy and consistency of the lens edge surface. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 This is a side sectional view of an embodiment of the present utility model.

[0017] Figure 3 This is a side sectional view of another embodiment of the present invention.

[0018] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the diagram.

[0019] Figure 5 This is a top-section structural diagram of another embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the elastic element structure of another embodiment of the present invention.

[0021] In the above figures: 1. Base; 11. Connecting hole; 12. Ball seat; 13. Limiting shell; 14. Sliding cavity; 15. Through hole; 2. Main polishing disc; 21. Connecting column; 22. Polishing pad; 3. Secondary polishing ring; 31. Connecting plate; 311. Ball head; 312. Clearance hole; 32. Limiting hole; 321. First rotating rod; 33. Sliding groove; 34. Sliding column; 4. Spring; 41. Ring plate; 42. Anti-deviation column; 43. Second rotating rod. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1-2As shown in the figure, this utility model embodiment proposes an adaptive optical lens edge polishing head, including a base 1, which provides rigid support for the overall structure. A connecting hole 11 is fixedly provided at the top center of the base 1 for fixed connection with the spindle of an external polishing machine. The spindle drives the base 1 to rotate as a whole. A main polishing disk 2 is fixedly provided at the bottom of the base 1, which is responsible for polishing the main area of ​​the lens. A secondary polishing ring 3 is connected to the bottom of the base 1 via a ball joint, which surrounds the main polishing disk 2. The secondary polishing ring 3 is responsible for polishing the edge area of ​​the lens. The ball joint structure allows the secondary polishing ring 3 to be connected to the main polishing disk 2 via a ball joint. The polishing ring 3 can adaptively adjust its tilt angle around the hinge point. At the same time, the auxiliary polishing ring 3 and the main polishing disk 2 are precisely clearance-fitted. The outer wall of the auxiliary polishing ring 3 is provided with a guide arc surface with a certain curvature that is concentric with the ball joint, so as to ensure that the auxiliary polishing ring 3 can always maintain a working gap with the main polishing disk 2 when it is micro-moving, and no mechanical interference will occur. The bottom of the base 1 is also provided with an elastic element, which elastically abuts against the top of the auxiliary polishing ring 3. The elastic element provides a stable contact reaction force when the auxiliary polishing ring 3 is subjected to micro-movement. A complete polishing pad 22 coplanarly is fixed at the bottom of the main polishing disk 2 and the auxiliary polishing ring 3.

[0024] In this exemplary embodiment, the main polishing disk 2 and the secondary polishing ring 3 are made of high-strength, lightweight, and corrosion-resistant materials such as aluminum alloy or stainless steel. The inner diameter of the secondary polishing ring 3 is slightly larger than the diameter of the main polishing disk 2, with a small gap between them to achieve precise dynamic fit. The inner and outer diameters of the secondary polishing ring 3 need to be set according to the diameter of the lens to be processed to ensure that the edge of the lens is within the pressing range of the secondary polishing ring 3 during polishing. The size, shape, and thickness of the polishing pad 22 are set according to the actual situation of the lens to be processed and are not limited here. Its material is preferably polyurethane, so that the polishing pad 22 can have a certain degree of flexibility and fluidity, thereby forming a continuous and uninterrupted polishing working surface on the lens surface. It should be noted that due to the precision of optical lens processing, the secondary polishing ring 3 will only float slightly relative to the main polishing disk 2. The slight floating will only change the local pressure on the edge of the lens and will not cause unevenness of the polished surface. Its floating range can be adjusted according to the distance between the secondary polishing ring 3 and the main polishing disk 2 and is not limited here.

[0025] In this embodiment, when the polishing head acts on the edge area or surface undulation area of ​​the lens, the secondary polishing ring 3 contacts the lens surface through the bottom polishing pad 22. The reaction force generated by the local contour of the lens on the secondary polishing ring 3 causes it to adaptively deflect around the center of the ball joint to conform to the surface change. At the same time, this force pushes the secondary polishing ring 3 to move slightly upward and compress the elastic element. The elastic element generates a corresponding rebound force based on the deformation and continues to act on the secondary polishing ring 3, so that it maintains stable dynamic support and constant contact pressure on the lens edge, thereby suppressing the deformation of the polishing pad 22 and abnormal pressure distribution caused by the loss of support at the lens edge or surface error.

[0026] like Figure 1-2 As shown, in another embodiment, a circular connecting plate 31 is fixedly disposed in the middle of the secondary polishing ring 3. The secondary polishing ring 3 and the connecting plate 31 are integrally formed or rigidly connected to form a bowl-shaped support structure. A ball head 311 is fixedly connected to the top of the connecting plate 31, and a ball seat 12 that precisely matches the ball head 311 is fixedly installed at the corresponding position at the bottom of the base 1. The two are hinged to form a spherical pair. Based on the above configuration, the connecting plate 31 can significantly increase the longitudinal section moment of inertia of the secondary polishing ring 3, thereby significantly improving its bending stiffness and overall stability, thus ensuring that it will not deform when subjected to uneven polishing pressure, and always maintaining the preset precision working gap between it and the main polishing disk 2.

[0027] like Figure 1-2 As shown, in another embodiment, further, a plurality of connecting columns 21 are uniformly fixedly arranged circumferentially at the bottom of the base 1. The lower end of the connecting column 21 is rigidly fixedly connected to the top of the main polishing disk 2 by means of thread fastening or welding, thereby providing stable support for the main polishing disk 2 and ensuring that it rotates synchronously with the base 1. The connecting plate 31 is provided with a clearance hole 312 for the connecting column 21 to pass through. The clearance hole 312 and the connecting column 21 adopt a precise clearance fit. While ensuring that the secondary polishing ring 3 can float smoothly along the axial direction of the connecting column 21, its radial clearance is strictly controlled to be extremely small. In this way, the circumferential constraint effect of the connecting column 21 on the wall of the clearance hole 312 is used to effectively suppress the circumferential rotation or horizontal displacement of the secondary polishing ring 3 relative to the main polishing disk 2 that may occur under the action of polishing force, thereby maintaining its tilting and floating motion only around the center of the ball joint, ensuring the stability of the working posture of the secondary polishing ring 3 and the controllability of its motion trajectory.

[0028] like Figure 1-2 As shown, in another embodiment, a cylindrical limiting shell 13 extending downwards is fixedly connected to the outer edge of the bottom of the base 1. The inner wall of the limiting shell 13 is configured as a guide arc surface concentric with the ball head 311. The outer wall of the secondary polishing ring 3 is spaced apart from the inner wall of the limiting shell 13. Based on the above configuration, the inner arc surface of the limiting shell 13 can surround and cover the outer wall of the secondary polishing ring 3, thus protecting the secondary polishing ring 3. At the same time, it ensures that when the secondary polishing ring 3 deflects around the center of the ball joint, its outer wall and the inner wall of the limiting shell 13 always maintain a uniform gap without mechanical interference.

[0029] like Figure 1-2As shown, in another embodiment, the outer wall of the limiting shell 13 is further provided with a threaded hole, wherein a first rotating rod 321 is threadedly connected. The first rotating rod 321 is composed of a knob and a screw fixed coaxially therewith. The side wall of the secondary polishing ring 3 is provided with a limiting hole 32 with a diameter slightly larger than that of the screw at the corresponding position. Based on the above configuration, by rotating the knob, the screw can be driven to screw into the threaded hole and its end can gradually extend into and finally press against the limiting hole 32 on the side wall of the secondary polishing ring 3, thereby achieving forced locking of the spatial position of the secondary polishing ring 3, preventing it from floating or tilting around the ball joint center, thus converting the entire polishing head into a traditional rigid integral polishing head to meet the specific requirements of different polishing stages or processes for the polishing pad 22.

[0030] like Figure 1-2 As shown, in another embodiment, the elastic element further includes a spring 4, which is circumferentially and uniformly fixed to the bottom of the base 1. Each spring 4 has an anti-deviation post 42 nested and fixed inside. Based on the above arrangement, the circumferential arrangement of the springs 4 can provide the secondary polishing ring 3 with a uniform, stable elastic reaction force that is always directed towards the lens surface. The built-in anti-deviation post 42 can effectively restrain the radial bending or instability that may occur when the spring 4 is compressed, ensuring that it is only compressed and rebounded along the axial direction, thus ensuring the uniformity and consistency of the pressure output during the adaptive adjustment process. In addition, the number and parameters of the springs 4 can be flexibly set or adjusted according to the actual working conditions, and damping media or devices can be added to the springs 4 to suppress harmful vibrations or impacts, so as to adapt to the dynamic response characteristics required by different polishing processes.

[0031] like Figure 3-4 and Figure 6 As shown, in another embodiment, the elastic element includes a ring plate 41 and several springs 4 fixed around the bottom of the ring plate 41. A vertical sliding cavity 14 is provided in the base 1, and the sliding cavity 14 communicates with the bottom space of the base 1 to allow the springs 4 to extend. The ring plate 41 is nested in the sliding cavity 14 and can slide up and down along its inner wall. A threaded hole is provided at the top of the base 1, in which a second rotating rod 43 is threadedly connected. The bottom of the second rotating rod 43 is rotatably connected to the top of the ring plate 41. The threaded connection part between the second rotating rod 43 and the base 1 is provided with rotational damping or equipped with an auxiliary locking mechanism to prevent it from rotating spontaneously during the polishing process. By rotating the second rotating rod 43, the ring plate 41 can be driven to make precise vertical displacement in the sliding cavity 14, thereby flexibly adjusting the initial distance between the lower end of the spring 4 and the top of the auxiliary polishing ring 3, realizing stepless control of the pre-compression of the spring 4, so that the polishing head can quickly adapt to the process requirements of edge pressure for different lens materials and polishing stages.

[0032] like Figure 3-6As shown, in another embodiment, further, the top of the secondary polishing ring 3 is radially surrounded by a plurality of sliding grooves 33, and a sliding post 34 is slidably disposed in each sliding groove 33. The number of sliding posts 34 corresponds to the number of springs 4. The bottom of the base 1 is surrounded by a plurality of vertical through holes 15 communicating with the sliding cavity 14. The sliding post 34 extends into the sliding cavity 14 through the through holes 15, and its top end abuts against the bottom of the spring 4. Based on the above arrangement, the through holes 15 provide precise guidance for the movement of the sliding post 34, constraining it to slide only in the vertical direction, while the sliding grooves 33 provide the necessary space for the sliding post 34 to slide. The required radial movement degree of freedom is achieved. When the secondary polishing ring 3 adaptively tilts around the ball joint, the sliding groove 33 at its top can follow the vertical movement trajectory of the sliding column 34 while allowing it to undergo corresponding radial displacement, thereby avoiding rigid compression and structural damage caused by mismatch in movement trajectory. The sliding column 34 stably transmits the polishing force borne by the secondary polishing ring 3 to the upper spring 4 in the vertical direction, realizing more precise force transmission and pressure feedback. At the same time, the tight fit between the sliding column 34 and the through hole 15 effectively suppresses the circumferential rotation of the secondary polishing ring 3 during operation, significantly enhancing its motion stability.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An adaptive optical lens edge polishing head, comprising a base (1), the top of which is fixedly connected to the spindle of an external polishing machine, and a main polishing disk (2) fixedly disposed at the bottom of the base (1), characterized in that: The base (1) has a secondary polishing ring (3) that surrounds the main polishing disk (2) at the bottom via a ball joint. The secondary polishing ring (3) is spaced apart from the main polishing disk (2). The outer wall of the secondary polishing ring (3) is provided with a guide arc surface concentric with the hinge point. The base (1) also has an elastic element at the bottom. The elastic element elastically abuts against the top of the secondary polishing ring (3). The main polishing disk (2) and the secondary polishing ring (3) have coplanar polishing pads (22) fixed at the bottom.

2. The adaptive optical lens edge polishing head as described in claim 1, characterized in that: A connecting plate (31) is fixedly installed in the middle of the secondary polishing ring (3), a ball head (311) is fixedly connected to the top of the connecting plate (31), and a ball seat (12) hinged to the ball head (311) is fixedly installed at the bottom of the base (1).

3. The adaptive optical lens edge polishing head as described in claim 2, characterized in that: The base (1) is fixedly provided with a number of connecting columns (21) at the bottom. The connecting columns (21) are fixedly connected to the top of the main polishing disk (2). The connecting plate (31) is provided with clearance holes (312) for the connecting columns (21) to pass through.

4. The adaptive optical lens edge polishing head as described in claim 2, characterized in that: The base (1) has a limiting shell (13) surrounding its bottom outer edge. The inner wall of the limiting shell (13) is a guide arc surface concentric with the ball head (311). The outer wall of the secondary polishing ring (3) is spaced apart from the inner wall of the limiting shell (13).

5. The adaptive optical lens edge polishing head as described in claim 4, characterized in that: The outer wall of the limiting shell (13) is provided with a threaded hole, wherein a first rotating rod (321) is threadedly connected, and the side wall of the secondary polishing ring (3) is provided with a limiting hole (32) into which the first rotating rod (321) can be screwed.

6. The adaptive optical lens edge polishing head as described in claim 1, characterized in that: The elastic element includes a spring (4), and several springs (4) are fixedly arranged around the bottom of the base (1). An anti-deviation column (42) is fixedly arranged inside any spring (4).

7. The adaptive optical lens edge polishing head as described in claim 1, characterized in that: The elastic element includes a ring plate (41) and several springs (4) fixed around the bottom of the ring plate (41). The base (1) is provided with a sliding cavity (14) for the ring plate (41) to slide up and down. The top of the base (1) is provided with a threaded hole, wherein a second rotating rod (43) is provided in the threaded connection, and the bottom of the second rotating rod (43) is rotatably connected to the top of the ring plate (41).

8. The adaptive optical lens edge polishing head as described in claim 7, characterized in that: The top of the secondary polishing ring (3) is radially surrounded by several sliding grooves (33), and a sliding column (34) is slidably disposed in any sliding groove (33). The number of sliding columns (34) corresponds to the number of springs (4). The bottom of the base (1) is surrounded by several through holes (15) communicating with the sliding cavity (14). The sliding column (34) abuts against the bottom of the spring (4) in the through hole (15).

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