Multi-point out-of-focus vision prevention and control lens and production process thereof

Abstract

The invention relates to the field of lens processing, in particular to a multi-point out-of-focus vision prevention and control lens and a production process thereof.The device adopted in the production process comprises a workbench, a lens groove used for containing the lens is formed in the upper end of the workbench, a photosensitive sensor is fixedly arranged in the center of the lens groove, and centering clamps are arranged on the periphery in the lens groove; a side plate is fixedly arranged on one side of the upper end of the workbench, a lead screw pair is arranged at one end of the side plate, sliding rails are fixedly arranged on the two sides of the lead screw pair, a lifting table is slidably installed on the sliding rails, the lead screw pair is connected with the lifting table, a fixing shaft rod is fixedly arranged at the bottom of the lifting table, and the axis of the fixing shaft rod is aligned with the center of the lens groove. A sliding sleeve is axially and slidably mounted on the fixed shaft rod, and a rotating frame is rotatably mounted on the outer side of the sliding sleeve. The deflection angle of the grinding rod and the grinding head can be adjusted according to different machining positions, so that the grinding rod and the grinding head can always vertically face the inner cambered surface of the lens, and the grinding effect can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lens processing, and in particular to a multi-point defocus vision prevention and control lens and a production process thereof. Background Art

[0002] Multi-point defocus myopia prevention and control lenses are specially designed eyeglass lenses that aim to slow the progression of myopia by changing the focus of incident light. Multi-point defocus lenses set up multiple defocus areas on the lens so that when the eyes look at distant objects, the myopic defocus signals generated in these areas can inhibit the growth of the eye axis, thereby achieving the purpose of controlling the development of myopia. Specifically, the lens design includes a central myopia correction area and a peripheral defocus area, where the central area is usually used for normal vision, while the peripheral area forms myopic defocus through a microlens array, thereby reducing hyperopic defocus and controlling the deepening of myopia.

[0003] At present, in the process of processing and producing multi-point defocus lenses, the processing is difficult due to the different positions of the defocus points in the defocus area on the lens arc surface. Each time the defocus points in different areas are processed, the position of the tool must be carefully calibrated and adjusted, resulting in low processing efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-point defocus vision prevention and control lens and a production process thereof, aiming to solve the above-mentioned technical problems.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A production process for multi-point defocus vision control lenses, the device used in the production process includes a workbench, a lens groove for accommodating lenses is arranged at the upper end of the workbench, a photosensor is fixedly arranged at the center of the lens groove, a centering fixture is arranged around the lens groove, a side plate is fixedly arranged on one side of the upper end of the workbench, a screw pair is arranged at one end of the side plate, slide rails are fixedly arranged on both sides of the screw pair, a lifting platform is slidably installed on the slide rails, the screw pair is connected to the lifting platform, a fixed shaft rod is fixedly arranged at the bottom of the lifting platform, the axis of the fixed shaft rod is aligned with the center of the lens groove, a sliding sleeve is axially slidably installed on the fixed shaft rod, a rotating frame is rotatably installed on the outer side of the sliding sleeve, limiting parts are arranged at both ends of the rotating frame, ear seats are arranged on the outer walls of the limiting parts, and the ear seats are rotatably connected to the There is a mounting plate, a bottom plate is fixedly arranged at the bottom end of the fixed shaft rod, a laser emitter is fixedly arranged at the center of the bottom of the bottom plate, and the laser emitter is vertically facing the photosensitive sensor. An annular groove is arranged on the outer circumference of the bottom plate, and a follower slider is slidably installed in the annular groove. One side of the mounting plate is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the follower slider. A blade cylinder is fixedly arranged on the upper end of the mounting plate, and the output end of the blade cylinder is fixedly connected to a shell, and a lifting plate is arranged inside the shell, and an electric telescopic rod is fixedly arranged on the top of the shell, and the electric telescopic rod is fixedly connected to the lifting plate, and a power motor is fixedly arranged on the upper end of the lifting plate, and a grinding rod is arranged at the output end of the power motor, and the bottom end of the grinding rod passes through the bottom of the shell and is connected to the grinding head through a quick-change connecting seat.

[0006] The production process comprises the following steps: Step 1: Clamping and positioning: Place the lens to be processed in the lens slot, and use the centering fixture to clamp the lens so that the center of the lens is aligned with the photosensor.

[0007] Step 2: Center calibration: The laser transmitter emits a vertical laser, which passes through the center of the lens and hits the photosensor. The signal received by the photosensor is used to determine whether the fixed shaft is aligned with the center of the lens.

[0008] Step 3: Adjust the deflection angle. According to the different grinding positions on the lens arc surface, the sleeve is adjusted to slide axially along the fixed shaft rod, and the mounting plate is driven to deflect through the connecting rod, so that the grinding rod and the grinding head can swing until they are perpendicular to the lens arc surface.

[0009] Step 4: Defocusing processing: the blade cylinder drives the shell to gradually approach the lens until the grinding head contacts the lens. The power motor is used to drive the grinding rod and the grinding head to rotate, and the grinding feed amount is precisely controlled by the electric telescopic rod. After the grinding is completed, the rotating rotating frame is gradually adjusted to realize the defocusing grinding process of the inner arc surface of the lens in the circumferential direction.

[0010] As a further solution of the present invention: a limiting ring rail is arranged on the outer wall of the sliding sleeve, the limiting portion is adapted to be slidably installed on the limiting ring rail, and a return spring is arranged between the bottom of the sliding sleeve and the bottom plate.

[0011] As a further solution of the present invention: an external tooth groove is arranged on the outer circumference of the rotating frame, a driving motor is fixedly arranged on the upper end of the sliding sleeve, a rotating gear is connected to the output end of the driving motor, and the rotating gear is meshed with the external tooth groove.

[0012] As a further solution of the present invention: an adjusting cylinder is fixedly arranged on the upper end of the lifting platform, the output end of the adjusting cylinder is fixedly connected to the upper end of the sliding sleeve, a guide rod is fixedly arranged on one side of the upper end of the sliding sleeve, and the top end of the guide rod slides through the lifting platform.

[0013] As a further solution of the present invention: a buffer spring is arranged between the bottom of the lifting plate and the shell.

[0014] As a further solution of the present invention: a radially arranged sliding groove runs through the periphery of the lens groove, the centering fixture includes a sliding block, the sliding block is adapted to be slidably installed in the sliding groove, a clamping block is fixedly arranged on the top of the sliding block, a sliding pin is fixedly arranged on the bottom of the sliding block, and a reset spring is arranged between one end of the sliding block and the sliding groove.

[0015] As a further solution of the present invention: a toothed disc is rotatably installed at the bottom of the workbench, a clamping motor is fixedly installed at the upper end of the workbench, a matching gear is arranged at the output end of the clamping motor, the matching gear is meshed with the toothed disc, and inclined grooves are evenly arranged on the toothed disc, and the sliding pin is adapted to be slidably installed in the corresponding inclined grooves.

[0016] The present invention also provides a multi-point defocus vision control lens, which is made using the above-mentioned production process of a multi-point defocus vision control lens, the diameter of the lens is 78 mm, the maximum thickness of the lens is 6 mm, the top of the lens is an inner arc surface with a radius of 170 mm, and the inner arc surface of the lens is processed with defocus points arranged in concentric ring bands, and the defocus points on each ring band are evenly distributed circumferentially.

[0017] Beneficial effects of the present invention: (1) When processing the lens, first place the lens in the lens groove, and then use the centering fixture to clamp and fix the lens. While ensuring stability, the center of the lens can always be aligned with the photosensor in the center of the lens groove. When the vertical laser emitted by the laser transmitter is directed to the lens, since the laser will not be refracted in the center of the lens, the laser will pass through the lens and hit the photosensor. Therefore, the axis of the fixed shaft rod can be calibrated to be aligned with the center of the lens according to the laser signal received by the photosensitive sensor, so that the deflection adjustment process achieved by the axial sliding of the sleeve and the rotation process of the rotating frame around the axis can be based on the center of the lens, which is conducive to improving the processing accuracy.

[0018] (2) When the defocused point is processed and ground on the inner arc surface of the lens, the sliding sleeve is used to slide axially along the fixed shaft rod, and the sliding sleeve will drive the rotating frame to move synchronously. During the circumferential movement, the rotating frame will cooperate with the connecting rod to drive the mounting plate to achieve deflection, so that the grinding rod and the grinding head can adjust the deflection angle according to the different processing positions, so that the grinding rod and the grinding head can always be vertically facing the inner arc surface of the lens, which is beneficial to improve the grinding effect.

[0019] (3) By using two sets of symmetrically arranged mounting plates and two sets of grinding heads, the two ends of the inner arc surface of the lens can be processed at the same time. When the grinding point needs to be changed on the same circumference, by rotating the rotating frame, the mounting plate will drive the follower slider to slide along the annular groove through the connecting rod, so that the left and right sets of grinding heads can achieve stable horizontal deflection, so that the grinding position in the circumferential direction can be quickly adjusted, which is conducive to improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the workbench in the present invention.

[0023] Figure 3 It is a schematic diagram of the bottom structure of the workbench in the present invention.

[0024] Figure 4 It is a structural schematic diagram of the centering fixture in the present invention.

[0025] Figure 5 It is a schematic diagram of the installation of the fixing rod in the present invention.

[0026] Figure 6 It is a structural schematic diagram of the sliding sleeve in the present invention.

[0027] Figure 7It is a schematic diagram of the internal structure of the sliding sleeve in the present invention.

[0028] Figure 8 It is a structural schematic diagram of the rotating frame in the present invention.

[0029] Fig. 9 It is a structural schematic diagram of the mounting plate in the present invention.

[0030] Fig.10 It is a schematic diagram of the internal structure of the shell in the present invention.

[0031] Fig.11 It is a top view of the lens after processing of the present invention.

[0032] Fig.12 yes Fig.11 Schematic diagram of the cross section along the AA direction.

[0033] In the figure: 1, workbench; 101, lens slot; 102, sliding slot; 103, photosensor; 104, clamping motor; 2, centering fixture; 201, sliding block; 2011, sliding pin; 2012, return spring; 202, clamping block; 203, toothed disc; 2031, inclined slide; 204, matching gear; 3, side plate; 301, lead screw pair; 303, slide rail; 4, lifting platform; 401, adjusting cylinder; 5, fixed shaft; 501, bottom plate; 502, laser transmitter; 503, annular slide ; 504, follow-up slider; 6, sliding sleeve; 601, limit ring rail; 602, return spring; 603, drive motor; 604, rotating gear; 605, guide rod; 7, rotating frame; 701, limit part; 702, ear seat; 703, external tooth groove; 8, mounting plate; 801, connecting rod; 802, blade cylinder; 9, housing; 901, lifting plate; 902, electric telescopic rod; 903, buffer spring; 904, power motor; 905, grinding rod; 9051, quick-change connecting seat; 906, grinding head. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 As shown, the present invention is a production process of a multi-point defocus vision prevention and control lens, and the production process includes the following steps: Step 1: clamping and positioning, placing the lens to be processed in the lens groove 101, and using the centering fixture 2 to clamp the lens in a centering manner so that the center of the lens is aligned with the photosensor 103.

[0036] Step 2: Center calibration: the laser emitter 502 emits a vertical laser, which passes through the center of the lens and hits the photosensor 103. The signal received by the photosensor 103 is used to determine whether the fixed shaft 5 is aligned with the center of the lens.

[0037] Step three: Adjust the deflection angle. According to the different grinding positions required on the curved surface of the lens, the sliding sleeve 6 is adjusted to slide axially along the fixed shaft 5, and the mounting plate 8 is driven to deflect through the connecting rod 801, so that the grinding rod 905 and the grinding head 906 are swung until they are perpendicular to the curved surface of the lens.

[0038] Step 4: off-focus processing, the blade cylinder 802 drives the shell 9 to gradually approach the lens until the grinding head 906 contacts the lens, and the power motor 904 is used to drive the grinding rod 905 and the grinding head 906 to rotate, and the grinding feed amount is finely controlled by the electric telescopic rod 902. After the grinding is completed, the rotating rotating frame 7 is gradually adjusted to realize the off-focus grinding process of the inner arc surface of the lens in the circumferential direction.

[0039] like Figure 1 , Figure 5-Figure 10As shown, the device used in the production process includes a workbench 1, a lens groove 101 for accommodating a lens is arranged on the upper end of the workbench 1, a photosensor 103 is fixedly arranged in the center of the lens groove 101, a centering fixture 2 is arranged around the lens groove 101, a side plate 3 is fixedly arranged on one side of the upper end of the workbench 1, a screw pair 301 is arranged at one end of the side plate 3, slide rails 303 are fixedly arranged on both sides of the screw pair 301, a lifting platform 4 is slidably installed on the slide rails 303, the screw pair 301 is connected to the lifting platform 4, a fixed shaft rod 5 is fixedly arranged at the bottom of the lifting platform 4, the axis of the fixed shaft rod 5 is aligned with the center of the lens groove 101, a sliding sleeve 6 is axially slidably installed on the fixed shaft rod 5, a rotating frame 7 is rotatably installed on the outer side of the sliding sleeve 6, limiting parts 701 are arranged at both ends of the rotating frame 7, ear seats 702 are arranged on the outer walls of the limiting parts 701, and mounting plates 8 are rotatably connected to the ear seats 702, and a bottom plate 50 is fixedly arranged at the bottom end of the fixed shaft rod 5 1. A laser emitter 502 is fixedly arranged at the center of the bottom of the bottom plate 501, and the laser emitter 502 is vertically facing the photosensitive sensor 103. An annular groove 503 is arranged on the outer circumference of the bottom plate 501, and a follow-up slider 504 is slidably installed in the annular groove 503. One side of the mounting plate 8 is rotatably connected to one end of the connecting rod 801, and the other end of the connecting rod 801 is rotatably connected to the follow-up slider 504. A blade cylinder 802 is fixedly arranged on the upper end of the mounting plate 8, and the output end of the blade cylinder 802 is fixedly connected to the shell 9. A lifting plate 901 is arranged inside the shell 9, and an electric telescopic rod 902 is fixedly arranged on the top of the shell 9, and the electric telescopic rod 902 is fixedly connected to the lifting plate 901. A power motor 904 is fixedly arranged on the upper end of the lifting plate 901, and a grinding rod 905 is arranged at the output end of the power motor 904. The bottom end of the grinding rod 905 passes through the bottom of the shell 9 and is connected to the grinding head 906 through a quick-change connecting seat 9051.

[0040] Specifically, when processing the lens, first place the lens into the lens groove 101, and then use the centering fixture 2 to clamp and fix the lens. While ensuring stability, the center of the lens can always be aligned with the photosensor 103 in the center of the lens groove 101. When the vertical laser emitted by the laser emitter 502 is directed to the lens, since the laser will not be refracted in the center of the lens, the laser will pass through the lens and hit the photosensor 103. Therefore, the axis of the fixed shaft rod 5 can be calibrated and aligned with the center of the lens according to the laser signal received by the photo sensor, so that the deflection adjustment process achieved by the axial sliding of the sleeve 6 and the rotation process of the rotating frame 7 around the axis can be based on the center of the lens, which is beneficial to improving the processing accuracy.

[0041] More specifically, when the defocused point is processed and ground on the inner arc surface of the lens, the sleeve 6 is used to perform axial sliding adjustment along the fixed shaft 5, and the sleeve 6 will drive the rotating frame 7 to move synchronously. During the circumferential movement, the rotating frame 7 will cooperate with the connecting rod 801 to drive the mounting plate 8 to achieve deflection, so that the grinding rod 905 and the grinding head 906 can adjust the deflection angle according to the different processing positions, so that the grinding rod 905 and the grinding head 906 can always be vertically facing the inner arc surface of the lens, which is beneficial to improving the grinding effect.

[0042] More specifically, by utilizing two symmetrically arranged groups of mounting plates 8 and two groups of grinding heads 906, the two ends of the inner arc surface of the lens can be processed with defocus points at the same time. At the same time, when the grinding point needs to be changed on the same circumference, by rotating the rotating frame 7, the mounting plate 8 will drive the follow-up slider 504 to slide along the annular groove 503 through the connecting rod 801, so that the left and right groups of grinding heads 906 can achieve stable horizontal deflection, so that the grinding station in the circumferential direction can be quickly adjusted, which is beneficial to improving the processing efficiency.

[0043] like Figure 6 and Figure 7 As shown, a limiting ring rail 601 is provided on the outer wall of the sliding sleeve 6 , the limiting portion 701 is adapted to be slidably installed on the limiting ring rail 601 , and a return spring 602 is provided between the bottom of the sliding sleeve 6 and the bottom plate 501 .

[0044] Specifically, by slidingly cooperating between the limiting portion 701 and the limiting rail 303 , the rotating frame 7 can rotate relative to the sliding sleeve 6 . Meanwhile, the limiting rail 303 exerts a limiting constraint on the limiting portion 701 , so that the rotating frame 7 can undergo synchronous axial displacement with the sliding sleeve 6 .

[0045] like Figure 6 and Figure 8 As shown, an outer tooth groove 703 is provided on the outer circumference of the rotating frame 7 , a driving motor 603 is fixedly provided on the upper end of the sliding sleeve 6 , and a rotating gear 604 is connected to the output end of the driving motor 603 , and the rotating gear 604 is meshed with the outer tooth groove 703 .

[0046] Specifically, when the driving motor 603 is started, it will drive the rotating gear 604 to rotate, and the rotating gear 604 will drive the rotating frame 7 to realize a circumferential rotation process through the external tooth groove 703, thereby being able to drive the grinding rod 905 and the grinding head 906 at both ends to rotate horizontally to adjust the grinding position.

[0047] like Figure 5 As shown, an adjusting cylinder 401 is fixedly provided on the upper end of the lifting platform 4, and the output end of the adjusting cylinder 401 is fixedly connected to the upper end of the sliding sleeve 6. A guide rod 605 is fixedly provided on one side of the upper end of the sliding sleeve 6, and the top end of the guide rod 605 slides through the lifting platform 4.

[0048] Specifically, when the regulating cylinder 401 is started, the sliding sleeve 6 will be driven to slide along the fixed shaft 5. During this process, the guide rod 605 will always slide through the lifting platform 4, which is beneficial to improving the stability of the sliding sleeve 6 during the lifting process.

[0049] like Fig.10 As shown, a buffer spring 903 is arranged between the bottom of the lifting plate 901 and the shell 9.

[0050] Specifically, when the electric telescopic rod 902 is used to push the lifting plate 901 forward, the lifting plate 901 will compress the buffer spring 903 to cause it to undergo elastic deformation, thereby effectively buffering the impact pressure during the forward push, so that the front end grinding head 906 will not have a direct hard collision when in contact with the lens, which is beneficial to protecting the lens.

[0051] like Figure 2-Figure 4 As shown, a radially arranged sliding groove 102 runs through the periphery of the lens groove 101, and the centering fixture 2 includes a sliding block 201, which is adapted to be slidably installed in the sliding groove 102, a clamping block 202 is fixedly arranged on the top of the sliding block 201, a sliding pin 2011 is fixedly arranged on the bottom of the sliding block 201, and a return spring 2012 is arranged between one end of the sliding block 201 and the sliding groove 102.

[0052] Furthermore, a toothed disc 203 is rotatably installed at the bottom of the workbench 1, and a clamping motor 104 is fixedly installed at the upper end of the workbench 1. A matching gear 204 is provided at the output end of the clamping motor 104. The matching gear 204 is meshed with the toothed disc 203. Inclined grooves 2031 are evenly arranged on the toothed disc 203, and the sliding pin 2011 is adapted to be slidably installed in the corresponding inclined groove 2031.

[0053] Specifically, by setting up the centering clamp 2, the clamping motor 104 is started to drive the matching gear 204 to rotate, and the matching gear 204 will drive the toothed disc 203 to rotate. During the rotation process, the toothed disc 203 will use the sliding cooperation between the sliding pin 2011 and the inclined sliding groove 2031 to synchronously drive multiple groups of sliding blocks 201 to slide radially along the sliding groove 102 until the multiple groups of clamping blocks 202 simultaneously contact and abut against the outer wall of the lens, thereby realizing the centering clamping process of the lens.

[0054] The working principle of the present invention is as follows: Figure 1-Figure 10As shown, when processing the lens, the lens is first placed in the lens groove 101, the clamping motor 104 is started, driving the matching gear 204 to rotate, and the matching gear 204 will drive the toothed disc 203 to rotate. During the rotation process, the toothed disc 203 uses the sliding cooperation between the sliding pin 2011 and the inclined sliding groove 2031 to synchronously drive multiple groups of sliding blocks 201 to slide radially along the sliding groove 102 until the multiple groups of clamping blocks 202 simultaneously contact and abut against the outer wall of the lens, thereby realizing the centering clamping process of the lens. The lead screw pair 301 drives the lifting platform 4 to move to a suitable height along the slide rail 303, and the laser emitter 502 emits a vertical laser, which will pass through the center of the lens and shoot onto the photosensitive sensor 103. The signal received by the photosensitive sensor 103 is used to determine whether the fixed shaft rod 5 is aligned with the center of the lens. When the adjusting cylinder 401 is started, the sliding sleeve 6 will slide along the fixed shaft 5, and the sliding sleeve 6 will drive the rotating frame 7 to move synchronously. During the circumferential movement, the rotating frame 7 will cooperate with the connecting rod 801 to drive the installation 8 to achieve deflection, so that the grinding rod 905 and the grinding head 906 can adjust the deflection angle according to the different processing positions, so that the grinding rod 905 and the grinding head 906 can always be vertically facing the inner arc surface of the lens. The blade cylinder 802 drives the housing 9 to gradually approach the lens until the grinding head 906 contacts the lens, and the power motor 904 is used to drive the grinding rod 905 and the grinding head 906 to rotate, and the electric telescopic rod 902 is used to finely control the grinding feed amount. After the grinding is completed, the driving motor 603 is started, which will drive the rotating gear 604 to rotate. The rotating gear 604 will drive the rotating frame 7 to achieve a circumferential rotation process through the external tooth groove 703, so that the grinding rods 905 and the grinding head 906 at both ends can be rotated in the horizontal direction to achieve the circumferential defocusing grinding process of the inner arc surface of the lens.

[0055] like Fig.11 and Fig.12 As shown, the present invention also provides a multi-point defocus vision control lens, which is made using the above-mentioned production process of a multi-point defocus vision control lens, wherein the lens diameter is 78mm, the error is ±0.05mm, the top of the lens is an inner arc surface with a radius of 170mm, the error is ±0.5mm, and the inner arc surface of the lens is processed with defocus points arranged in concentric ring bands, and the defocus points on each ring band are evenly distributed circumferentially.

[0056] The distribution of the microstructure of the out-of-focus point is shown in the following table:

[0057] It can be seen from the above table that the total number of defocus points in this embodiment is 1153. In the actual production process, the number of defocus points varies depending on the center thickness of the lens and the curvature of the concave surface, and the number ranges from 1000 to 1500.

[0058] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A production process for multi-point defocus vision control lenses, characterized in that: The device used in the production process comprises a workbench (1), wherein a lens groove (101) for accommodating a lens is arranged at the upper end of the workbench (1), a photosensor (103) is fixedly arranged in the center of the lens groove (101), and a centering fixture (2) is arranged around the inner periphery of the lens groove (101), a side plate (3) is fixedly arranged at one side of the upper end of the workbench (1), a lead screw pair (301) is arranged at one end of the side plate (3), slide rails (303) are fixedly arranged on both sides of the lead screw pair (301), a lifting platform (4) is slidably mounted on the slide rails (303), and the lead screw The pair (301) is connected to the lifting platform (4), a fixed shaft rod (5) is fixedly arranged at the bottom of the lifting platform (4), the axis of the fixed shaft rod (5) is aligned with the center of the lens groove (101), a sliding sleeve (6) is axially slidably mounted on the fixed shaft rod (5), a rotating frame (7) is rotatably mounted on the outer side of the sliding sleeve (6), both ends of the rotating frame (7) are provided with a limit portion (701), the outer wall of the limit portion (701) is provided with an ear seat (702), the ear seat (702) is rotatably connected to the mounting plate (8), and the bottom end of the fixed shaft rod (5) is fixedly provided with a bottom The bottom plate (501) is provided with a laser emitter (502) fixedly arranged at the center of the bottom of the bottom plate (501), and the laser emitter (502) is vertically oriented toward the photosensitive sensor (103). The outer circumference of the bottom plate (501) is provided with an annular groove (503), and a follower slider (504) is slidably installed in the annular groove (503). One side of the mounting plate (8) is rotatably connected to one end of the connecting rod (801), and the other end of the connecting rod (801) is rotatably connected to the follower slider (504). The upper end of the mounting plate (8) is fixedly provided with a blade cylinder (802). The output end of the blade cylinder (802) is fixedly connected to a housing (9), a lifting plate (901) is arranged inside the housing (9), an electric telescopic rod (902) is fixedly arranged at the top of the housing (9), the electric telescopic rod (902) is fixedly connected to the lifting plate (901), a power motor (904) is fixedly arranged at the upper end of the lifting plate (901), a grinding rod (905) is arranged at the output end of the power motor (904), and the bottom end of the grinding rod (905) passes through the bottom of the housing (9) and is connected to a grinding head (906) via a quick-change connection seat (9051); The production process comprises the following steps: Step 1: clamping and positioning, placing the lens to be processed in the lens groove (101), and using the centering fixture (2) to clamp the lens in a centering manner so that the center of the lens is aligned with the photosensitive sensor (103); Step 2: center calibration, emitting vertical laser light through the laser emitter (502), the laser light will pass through the center of the lens and hit the photosensor (103), and the signal received by the photosensor (103) is used to determine whether the fixed shaft (5) is aligned with the center of the lens; Step 3: Adjust the deflection angle. According to the different grinding positions on the lens arc surface to be processed, the sliding sleeve (6) is axially slidably adjusted along the fixed shaft (5), and the mounting plate (8) is driven to deflect through the connecting rod (801), so that the grinding rod (905) and the grinding head (906) are swung until they are perpendicular to the lens arc surface to be processed; Step 4: off-focus processing, the blade cylinder (802) drives the housing (9) to gradually approach the lens until the grinding head (906) contacts the lens, and the power motor (904) drives the grinding rod (905) and the grinding head (906) to rotate, and the grinding feed amount is finely controlled by the electric telescopic rod (902). After the grinding is completed, the rotating rotating frame (7) is gradually adjusted to achieve the off-focus grinding process of the inner arc surface of the lens in the circumferential direction.

2. The production process of a multi-point defocus vision prevention and control lens according to claim 1, characterized in that: A limit ring rail (601) is provided on the outer wall of the sliding sleeve (6), the limit portion (701) is adapted to be slidably mounted on the limit ring rail (601), and a return spring (602) is provided between the bottom of the sliding sleeve (6) and the bottom plate (501).

3. The production process of a multi-point defocus vision prevention and control lens according to claim 1, characterized in that: An external tooth groove (703) is provided on the outer circumference of the rotating frame (7), a driving motor (603) is fixedly provided on the upper end of the sliding sleeve (6), an output end of the driving motor (603) is connected to a rotating gear (604), and the rotating gear (604) is meshed with the external tooth groove (703).

4. The production process of a multi-point defocus vision prevention and control lens according to claim 1, characterized in that: An adjusting cylinder (401) is fixedly arranged at the upper end of the lifting platform (4); an output end of the adjusting cylinder (401) is fixedly connected to the upper end of the sliding sleeve (6); a guide rod (605) is fixedly arranged on one side of the upper end of the sliding sleeve (6); and the top end of the guide rod (605) slides through the lifting platform (4).

5. The production process of a multi-point defocus vision prevention and control lens according to claim 1, characterized in that: A buffer spring (903) is provided between the bottom of the lifting plate (901) and the housing (9).

6. The production process of a multi-point defocus vision prevention and control lens according to claim 1, characterized in that: A radially arranged sliding groove (102) is formed around the lens groove (101); the centering fixture (2) comprises a sliding block (201); the sliding block (201) is adapted to be slidably installed in the sliding groove (102); a clamping block (202) is fixedly arranged at the top of the sliding block (201); a sliding pin (2011) is fixedly arranged at the bottom of the sliding block (201); and a return spring (2012) is arranged between one end of the sliding block (201) and the sliding groove (102).

7. The production process of a multi-point defocus vision control lens according to claim 6, characterized in that: A toothed disc (203) is rotatably mounted on the bottom of the workbench (1), a clamping motor (104) is fixedly mounted on the upper end of the workbench (1), a matching gear (204) is arranged at the output end of the clamping motor (104), the matching gear (204) is meshed with the toothed disc (203), and inclined slide grooves (2031) are evenly arranged on the toothed disc (203), and the sliding pin (211) is adapted to be slidably mounted in the corresponding inclined slide groove (2031).

8. A multi-point defocus vision control lens, made by the production process of the multi-point defocus vision control lens according to claim 1, characterized in that: The diameter of the lens is 78 mm, the maximum thickness of the lens is 6 mm, the top of the lens is an inner arc surface with a radius of 170 mm, and the inner arc surface of the lens is processed with defocusing points arranged in concentric ring bands, and the defocusing points on each ring band are evenly distributed circumferentially.

Images