F-theta scanning lens for high-speed scanning 3D printer and manufacturing method thereof

Abstract

The present invention provides an F-theta scanning lens for a high-speed scanning 3D printer and a manufacturing method thereof, which relates to the technical field of optical lenses, and includes lens one, lens two, lens three, lens four and lens five arranged in sequence along the direction of incident light, lens one is a meniscus negative lens with a curved surface facing the incident light, lens two is a meniscus negative lens with a curved surface facing the incident light, lens three is a positive lens, lens four is a positive lens, lens five is a meniscus positive lens with a curved surface facing the incident light, and the field of view angle of the F-theta scanning lens is ±25°. The present invention forms an F-theta scanning lens through five lenses, which can eliminate chromatic aberration in a specific required band, has a uniform focusing spot, small distortion, simple structure, convenient installation, and strong practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to an F-theta scanning lens for a high-speed scanning 3D printer and a manufacturing method thereof. Background Art

[0002] F-theta is an optical scanning focusing lens used in conjunction with a galvanometer. It adjusts the incident angle of the large-diameter light beam incident on the galvanometer through the galvanometer's reflector and focuses it on the workpiece surface, enabling drilling, welding, cutting, marking, internal engraving and other processing operations on the workpiece within a specific range. With the rapid development of the 3D printing industry, laser 3D processing technology has been widely used in various precision processing fields, and laser processing with machine vision has also become a trend in the industry.

[0003] Laser printing technology with F-Theta scanning lens has the advantages of simple system structure and high stability, but it also has problems such as small scanning range, uneven spot focusing and F-Theta distortion. Summary of the invention

[0004] The present invention provides an F-theta scanning lens for a high-speed scanning 3D printer and a manufacturing method thereof, so as to solve at least one of the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention discloses an F-theta scanning lens for a high-speed scanning 3D printer, comprising lens one, lens two, lens three, lens four and lens five arranged in sequence along the direction of incident light, lens one is a meniscus negative lens with its curved surface facing the incident light, lens two is a meniscus negative lens with its curved surface facing the incident light, lens three is a positive lens, lens four is a positive lens, lens five is a meniscus positive lens with its curved surface facing the incident light, and the field of view angle of the F-theta scanning lens is ±25°.

[0006] Preferably, lens one includes curved surface one and curved surface two, curved surface one is close to the incident light direction, the curvature radius of curved surface one is -66.713 to -58.362 mm, the curvature radius of curved surface two is -73.586 to -65.791 mm, the center thickness of lens one is 12.56 mm to 17.68 mm, the refractive index of lens one is 1.76 to 1.88, and the Abbe number of lens one is 27.373;

[0007] Lens 2 includes curved surface 3 and curved surface 4, curved surface 3 is close to lens 1, the curvature radius of curved surface 3 is -186.362 to -167.647 mm, the curvature radius of curved surface 4 is -213.846 to -245.257 mm, the center thickness of lens 2 is 13.62 to 18.71 mm, the refractive index of lens 2 is 1.76 to 1.88, and the Abbe number of lens 2 is 27.373;

[0008] Lens three includes curved surface five and curved surface six. Curved surface five is close to lens two. The radius of curvature of curved surface five is -687.752 to -754.422 mm, the radius of curvature of curved surface six is ​​-198.963 to -247.853 mm, the center thickness of lens three is 19.25 to 24.75 mm, the refractive index of lens three is 1.37 to 1.68, and the Abbe number of lens three is 66.293.

[0009] Preferably, lens 4 includes curved surface 7 and curved surface 8, curved surface 7 is close to lens 3, the radius of curvature of curved surface 7 is -2347.761 to -2678.624 mm, the radius of curvature of curved surface 8 is -534.458 to -614.856 mm, the center thickness of lens 4 is 8.61 to 10.23 mm, the refractive index of lens 4 is 1.37 to 1.68, and the Abbe number of lens 4 is 66.293;

[0010] Lens five includes curved surface nine and curved surface ten. Curved surface nine is close to lens four. The radius of curvature of curved surface nine is -586.324 to -678.985 mm, the radius of curvature of curved surface ten is -297.856 to 386.497 mm, the center thickness of lens five is 18.76 to 13.87 mm, the refractive index of lens five is 1.37 to 1.68, and the Abbe number of lens five is 66.293.

[0011] A method for manufacturing an F-theta scanning lens for a high-speed scanning 3D printer, for manufacturing an F-theta scanning lens for a high-speed scanning 3D printer as described above, comprising the following steps:

[0012] S1: obtaining a plurality of semi-finished lens 1, a plurality of semi-finished lens 2, a plurality of semi-finished lens 3, a plurality of semi-finished lens 4 and a plurality of semi-finished lens 5, and sequentially placing the plurality of semi-finished lens 1, a plurality of semi-finished lens 2, a plurality of semi-finished lens 3, a plurality of semi-finished lens 4 and a plurality of semi-finished lens 5 into a laser cutting device in batches for cutting;

[0013] S2: Then, the cut semi-finished lens 1, the semi-finished lens 2, the semi-finished lens 3, the semi-finished lens 4 and the semi-finished lens 5 are sequentially placed into a grinding device for grinding to obtain lens 1, lens 2, lens 3, lens 4 and lens 5;

[0014] S3: Obtain a lens housing, and sequentially install lens one, lens two, lens three, lens four, and lens five into the lens housing.

[0015] Preferably, in step S1, a plurality of semi-finished lenses 1 are first placed into a laser cutting device, the laser cutting device cuts the plurality of semi-finished lenses 1, and then the laser cutting device sequentially cuts a plurality of semi-finished lenses 2, a plurality of semi-finished lenses 3, a plurality of semi-finished lenses 4 and a plurality of semi-finished lenses 5, wherein the laser cutting device comprises a base, on which two left-right symmetrical U-shaped plates are fixedly provided, a movable plate is slidably provided on the U-shaped plate, a linear motor 1 is installed on one of the U-shaped plates, the linear motor 1 is used to drive the movable plate to slide on the U-shaped plate, a through groove 1 is provided on the movable plate, a sliding block is slidably provided in the through groove 1, a linear motor 2 is provided on the movable plate, the linear motor 2 is used to drive the sliding block to slide in the through groove 1, an electric telescopic rod is fixedly provided at the lower end of the sliding block, a driving motor is fixedly provided at the lower output end of the electric telescopic rod, a rotating rod is fixedly connected to the lower output end of the driving motor, a telescopic limit plate is fixedly connected to the lower end of the rotating rod, a laser cutting head is embedded and installed on the telescopic limit plate, and a placement plate is also provided on the base.

[0016] Preferably, a filter box is fixedly arranged on the telescopic limit plate, and L-shaped tubes are connected through both sides of the filter box. The L-shaped tubes are fixedly passed through the telescopic limit plate, and the other end of the L-shaped tubes points to the laser cutting head;

[0017] A corrugated air intake pipe is connected through the filter box, the other end of the corrugated air intake pipe is connected through an air pump, and the air pump is also connected through an air outlet pipe. A hollow funnel is fixedly provided on the lower surface of the telescopic limit plate, the hollow funnel is coaxially arranged with the rotating rod, the air outlet pipe is fixedly passed through the telescopic limit plate, and the other end of the air outlet pipe is connected through the hollow funnel.

[0018] Preferably, in step S2, the plurality of cut semi-finished lenses 1 are first placed in a grinding device for grinding, and then the grinding device sequentially cuts the plurality of cut semi-finished lenses 2, the plurality of cut semi-finished lenses 3, the plurality of cut semi-finished lenses 4 and the plurality of cut semi-finished lenses 5, wherein the grinding device comprises a square seat, a mounting box is fixedly mounted on the square seat, a water tank is fixedly mounted on the mounting box, four evenly distributed stabilizing plates are fixedly mounted at the lower end of the mounting box, the stabilizing plates are fixedly connected to the front and rear side walls of the square seat, and the left and right opposite stabilizing plates are fixedly connected to each other. A T-plate is connected, the T-plate is fixedly connected to the front and rear side walls of the square seat, the upper end of the T-plate is fixedly connected to the installation box, telescopic clamping rods are symmetrically arranged in the front and rear of the square seat, the telescopic clamping rod on the rear side is rotatably connected to the rear side wall of the square seat, and the telescopic clamping rod on the rear side is rotatably connected to the T-plate on the rear side, the telescopic clamping rod on the front side is rotatably extended to the T-plate and the square seat on the front side, a connecting plate is fixedly arranged on the front side of the square seat, a grinding motor is fixedly arranged on the connecting plate, the rear output end of the grinding motor is fixedly connected to the telescopic clamping rod on the front side, and a grinding block is also installed in the square seat.

[0019] Preferably, a rotating rod is rotatably connected between the front and rear opposing stabilizing plates, and a gear 1 that is symmetrical front and back is fixedly provided on the rotating rod, a polishing block is fixedly provided on the left rotating rod, and the polishing block is arranged between the two gears 1 on the left, and a grinding block is fixedly provided on the right rotating rod, and the grinding block is arranged between the two gears 1 on the right, and a channel is also provided on the grinding block; a lifting plate is slidably provided in the installation box, and a lifting drive member is symmetrically installed on the installation box, the lower output end of the lifting drive member slides and extends into the installation box, and the lower output end of the lifting drive member is fixedly connected to the lifting plate, and a lifting block that is symmetrical front and back is fixedly provided at the lower end of the lifting plate, and the lifting block slides and extends out of the installation box, and a driving plate that is symmetrical front and back is fixedly provided at the lower end of the lifting block, and a toothed plate is fixedly provided on the side of the driving plate close to the square seat, and the toothed plate is meshingly connected with gear 1.

[0020] Preferably, a cylinder is installed in the center of the lifting plate, and a bellows is connected to the cylinder. Corresponding holes are opened on the upper surface of the installation box and the lower surface of the water tank, and the other end of the bellows passes through the hole and is connected to the water tank. A water outlet pipe is fixedly installed at the lower end of the cylinder, and the water outlet pipe slides and extends out of the installation box, and a water spray plate is provided at the outlet end of the water outlet pipe; a rotating block is rotatably arranged in the cylinder, and a plurality of grooves are arranged on the rotating block, and a spring is arranged in the groove, one end of the spring is fixedly connected in the groove, and the other end of the spring is fixedly connected to the water push plate, and the water push plate is slidably connected to the inner wall of the groove, and two limit retaining rings are also provided in the groove.

[0021] Preferably, a rotating shaft is fixedly arranged in the center of the rotating block, a slide groove is arranged on the rear side wall of the installation box, the rear side of the rotating shaft is slidably connected to the slide groove, a through groove 2 is arranged on the front side wall of the installation box, the rotating shaft extends out of the installation box from the through groove 2, and a gear 2 is also fixedly arranged on the front side of the rotating shaft; a pulley 1 is fixedly arranged on the rear output end of the grinding motor, and a rotating shaft is also rotatably connected on the front side wall of the square seat, a pulley 2 and a gear 3 are fixedly arranged on the rotating shaft, and belts are wound around the pulleys 1 and 2.

[0022] Compared with the prior art, the present invention provides an F-theta scanning lens for a high-speed scanning 3D printer and a manufacturing method thereof, which have the following beneficial effects: the F-theta scanning lens composed of 5 lenses can eliminate the chromatic aberration of a specific required band, and the focused light spot is uniform; by arranging the 5 lenses into a "negative-negative-positive-positive-positive" optical focal length system, the lens distortion is reduced; by setting the field of view angle of the F-theta scanning lens to ±25°, the scanning range is larger and the scanning speed is faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a physical diagram of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the laser cutting device of the present invention;

[0027] Figure 4 For the present invention Figure 3 A magnified image of point A;

[0028] Figure 5 For the present invention Figure 3 A top view of

[0029] Figure 6 The structure of the grinding device of the present invention is schematically shown in FIG. Figure 1 ;

[0030] Figure 7 The structure of the grinding device of the present invention is schematically shown in FIG. Figure 2 ;

[0031] Figure 8 is a cross-sectional view of a cylinder of the present invention;

[0032] Fig. 9 It is a side view of the grinding device of the present invention.

[0033] In the figure: 1. Lens 1; 101. Surface 1; 102. Surface 2; 2. Lens 2; 201. Surface 3; 202. Surface 4; 3. Lens 3; 301. Surface 5; 302. Surface 6; 4. Lens 4; 401. Surface 7; 402. Surface 8; 5. Lens 5; 501. Surface 9; 502. Surface 10; 6. Base; 7. U-shaped plate; 8. Moving plate; 9. Electric telescopic rod; 10. Driving motor; 11. Rotating rod; 12. Telescopic limit plate; 13. Hollow funnel; 14. Exhaust pipe; 15. Laser cutting head; 16. L-shaped pipe; 17. Filter box; 18. Corrugated suction pipe; 19. Air pump; 20. Linear motor 1; 21. Through slot 1; 22. Sliding block; 23. Grinding device; 24. Linear motor 2; 25. Square seat; 26. Polishing block; 27. Stabilizing plate; 28. Mounting box; 29. ​​Lifting drive; 30. Through slot 2; 31. Water tank; 32. Gear 2; 33. Lifting block; 34. Grinding block; 35. Channel; 36. Drive plate; 37. Belt; 38. Pulley 1; 39. T-plate; 40. Bellows; 41. Cylinder; 42. Water outlet pipe; 43. Rotating block; 44. Spring; 45. Rotating shaft; 46. Limit retaining ring; 47. Water push plate; 48. Groove; 49. Water spray plate; 50. Rotating rod; 51. Telescopic clamping rod; 52. Gear 1; 53. Connecting plate; 54. Grinding motor; 55. Pulley 2; 56. Gear 3; 57. Tooth plate; 58. Lifting plate; 59. Placement plate. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Example 1

[0037] An embodiment of the present invention provides an F-theta scanning lens for a high-speed scanning 3D printer, such as Figure 1-2 As shown, it includes lens 1, lens 2, lens 3, lens 4, lens 5, which are arranged in sequence along the direction of incident light. Lens 1 is a meniscus negative lens with its curved surface facing the incident light, lens 2 is a meniscus negative lens with its curved surface facing the incident light, lens 3 is a positive lens, lens 4 is a positive lens, and lens 5 is a meniscus positive lens with its curved surface facing the incident light. The field of view angle of the F-theta scanning lens is ±25°.

[0038] The working principle and beneficial effects of the above technical solution are as follows: obtain a lens housing, and sequentially install lens one 1, lens two 2, lens three 3, lens four 4 and lens five 5 into the lens housing; the F-theta scanning lens composed of 5 lenses can eliminate the chromatic aberration of a specific required band, and the focused light spot is uniform, and the lens distortion is reduced by arranging the 5 lenses into a "negative-negative-positive-positive-positive" optical focal length system, and by setting the field of view angle of the F-theta scanning lens to ±25°, the scanning range is larger and the scanning speed is faster.

[0039] Example 2

[0040] On the basis of the above-mentioned embodiment 1, Figure 1-2 As shown, lens 1 includes curved surface 101 and curved surface 2 102, curved surface 101 is close to the incident light direction, the curvature radius of curved surface 101 is -66.713 to -58.362 mm, the curvature radius of curved surface 2 102 is -73.586 to -65.791 mm, the center thickness of lens 1 is 12.56 mm to 17.68 mm, the refractive index of lens 1 is 1.76 to 1.88, and the Abbe number of lens 1 is 27.373;

[0041] Lens 2 2 includes curved surface 3 201 and curved surface 4 202, curved surface 3 201 is close to lens 1 1, the curvature radius of curved surface 3 201 is -186.362 to -167.647 mm, the curvature radius of curved surface 4 202 is -213.846 to -245.257 mm, the center thickness of lens 2 2 is 13.62 to 18.71 mm, the refractive index of lens 2 2 is 1.76 to 1.88, and the Abbe number of lens 2 2 is 27.373;

[0042] Lens three 3 includes curved surface five 301 and curved surface six 302. Curved surface five 301 is close to lens two 2. The radius of curvature of curved surface five 301 is -687.752 to -754.422 mm, the radius of curvature of curved surface six 302 is -198.963 to -247.853 mm, the center thickness of lens three 3 is 19.25 to 24.75 mm, the refractive index of lens three 3 is 1.37 to 1.68, and the Abbe number of lens three 3 is 66.293.

[0043] Wherein, preferably, the lens 44 includes a curved surface 701 and a curved surface 802, the curved surface 701 is close to the lens 33, the curvature radius of the curved surface 701 is -2347.761 to -2678.624 mm, the curvature radius of the curved surface 802 is -534.458 to -614.856 mm, the center thickness of the lens 44 is 8.61 to 10.23 mm, the refractive index of the lens 44 is 1.37 to 1.68, and the Abbe number of the lens 44 is 66.293;

[0044] Lens five 5 includes curved surface nine 501 and curved surface ten 502. Curved surface nine 501 is close to lens four 4. The radius of curvature of curved surface nine 501 is -586.324~-678.985mm, the radius of curvature of curved surface ten 502 is -297.856~386.497mm, the center thickness of lens five 5 is 18.76~13.87mm, the refractive index of lens five 5 is 1.37~1.68, and the Abbe number of lens five 5 is 66.293.

[0045] The beneficial effects of the above technical solution are: by adopting the above structure, the chromatic aberration of a specific required wavelength band can be eliminated, the focused light spot is uniform, and it has a high energy concentration after multiple experimental optimizations.

[0046] Example 3

[0047] A method for manufacturing an F-theta scanning lens for a high-speed scanning 3D printer, for manufacturing an F-theta scanning lens for a high-speed scanning 3D printer as described above, comprising the following steps:

[0048] S1: obtaining a plurality of semi-finished lens 1, a plurality of semi-finished lens 2, a plurality of semi-finished lens 3, a plurality of semi-finished lens 4 and a plurality of semi-finished lens 5, and sequentially placing the plurality of semi-finished lens 1, a plurality of semi-finished lens 2, a plurality of semi-finished lens 3, a plurality of semi-finished lens 4 and a plurality of semi-finished lens 5 into a laser cutting device in batches for cutting;

[0049] S2: Then, the cut semi-finished lens 1, semi-finished lens 2, semi-finished lens 3, semi-finished lens 4 and semi-finished lens 5 are sequentially placed into the grinding device 23 for grinding to obtain lens 1 1, lens 2 2, lens 3 3, lens 4 4 and lens 5 5;

[0050] S3: Obtain a lens housing, and sequentially install lens one 1, lens two 2, lens three 3, lens four 4 and lens five 5 into the lens housing.

[0051] The working principle and beneficial effects of the above technical solution are as follows: the first step is to obtain a plurality of semi-finished lenses 1, 2, 3, 4 and 5, and sequentially put the plurality of semi-finished lenses 1, 2, 3, 4 and 5 into a laser cutting device for cutting; the above semi-finished lenses can be purchased from the market, and then the plurality of semi-finished lenses are laid flat, and then the laser cutting device cuts the semi-finished lenses;

[0052] In the second step, the cut semi-finished lens 1, semi-finished lens 2, semi-finished lens 3, semi-finished lens 4 and semi-finished lens 5 are placed in the grinding device 23 for grinding to obtain lens 1 1, lens 2 2, lens 3 3, lens 4 4 and lens 5 5; in the third step, a lens housing is obtained, and lens 1 1, lens 2 2, lens 3 3, lens 4 4 and lens 5 5 are sequentially installed in the lens housing.

[0053] By setting up a laser cutting device, the desired diameter of the lens can be quickly cut, and then the edge of the lens can be polished by the grinding device 23, and the diameter of the lens can also be adjusted slightly, which has strong practicality and functionality.

[0054] Example 4

[0055] Based on the above embodiment 3, Figure 3-5 As shown, in step S1, a plurality of semi-finished lenses 1 are first placed into a laser cutting device, the laser cutting device cuts the plurality of semi-finished lenses 1, and then the laser cutting device sequentially cuts the plurality of semi-finished lenses 2, the plurality of semi-finished lenses 3, the plurality of semi-finished lenses 4 and the plurality of semi-finished lenses 5, wherein the laser cutting device comprises a base 6, on which two left-right symmetrical U-shaped plates 7 are fixedly arranged, on which a moving plate 8 is slidably arranged, and on which one of the U-shaped plates 7 is mounted a linear motor 20, which is used to drive the moving plate 8 to slide on the U-shaped plate 7 A through slot 21 is provided on the moving plate 8, a sliding block 22 is slidingly provided in the through slot 21, a linear motor 24 is provided on the moving plate 8, the linear motor 24 is used to drive the sliding block 22 to slide in the through slot 21, an electric telescopic rod 9 is fixedly provided at the lower end of the sliding block 22, a driving motor 10 is fixedly provided at the lower output end of the electric telescopic rod 9, a rotating rod 11 is fixedly connected to the lower output end of the driving motor 10, a telescopic limit plate 12 is fixedly connected to the lower end of the rotating rod 11, a laser cutting head 15 is embedded and installed on the telescopic limit plate 12, and a placing plate 59 is also provided on the base 6.

[0056] Preferably, a filter box 17 is fixedly provided on the telescopic limit plate 12, and L-shaped tubes 16 are connected through both sides of the filter box 17. The L-shaped tube 16 is fixedly passed through the telescopic limit plate 12, and the other end of the L-shaped tube 16 points to the laser cutting head 15;

[0057] A corrugated air intake pipe 18 is connected through the filter box 17, and the other end of the corrugated air intake pipe 18 is connected through an air pump 19, and the air pump 19 is also connected through an air outlet pipe 14. A hollow funnel 13 is fixedly provided on the lower surface of the telescopic limit plate 12, and the hollow funnel 13 is coaxially arranged with the rotating rod 11. The air outlet pipe 14 is fixedly passed through the telescopic limit plate 12, and the other end of the air outlet pipe 14 is connected through the hollow funnel 13.

[0058] The working principle and beneficial effects of the above technical solution are as follows: a number of semi-finished lenses 1 / a number of semi-finished lenses 2 / a number of semi-finished lenses 3 / a number of semi-finished lenses 4 / a number of semi-finished lenses 5 are placed on the placement plate 59 in batches, the linear motor 1 20 and the linear motor 2 24 are started, and the position of the sliding block 22 is adjusted in real time (i.e., the position of the sliding block 22 in the X-axis and Y-axis directions. Those skilled in the art can use other structures to adjust the position of the sliding block 22 in the X-axis and Y-axis directions, and the above structure is not limited). After the sliding block 22 drives the electric telescopic rod 9 to reach the position, the electric telescopic rod 9 drives the driving motor 10 to descend. After descending to a suitable position (the suitable position is determined by the user), the telescopic limit plate 12 is then lengthened or shortened, so that the rotation radius of the laser cutting head 15 is adapted to the radius to be cut;

[0059] At this time, the drive motor 10 is started, the drive motor 10 drives the rotating rod 11 to rotate, the rotating rod 11 drives the telescopic limit plate 12 to rotate, the telescopic limit plate 12 drives the laser cutting head 15 to rotate, and the laser cutting head 15 cuts the semi-finished lens; during the cutting process, the air pump 19 is started, and the wind near the laser cutting head 15 enters the filter box 17 from the L-shaped tube 16, and then passes through the filtration of the filter box 17, enters the air pump 19 through the corrugated suction pipe 18, and then enters the hollow funnel 13 through the outlet pipe 14, and then is sprayed onto the semi-finished lens from the hollow funnel 13; during the cutting process of the laser cutting head 15, the L-shaped tube 16 can absorb impurities such as smoke generated by the cutting to prevent laser scattering caused by excessive smoke, thereby causing problems in the cutting, and through the filtration of the filter box 17, smoke can be absorbed, so that clean air is blown onto the semi-finished lens, and the absorbed smoke has a high temperature, which can increase the temperature of the semi-finished lens, thereby making laser cutting easier and effectively improving the secondary utilization rate of energy.

[0060] Example 5

[0061] On the basis of the above-mentioned embodiment 4, Figure 6-9As shown, in step S2, the cut semi-finished lens 1 is first placed in the grinding device 23 for grinding, and then the grinding device 23 sequentially cuts the cut semi-finished lens 2, the semi-finished lens 3, the semi-finished lens 4 and the semi-finished lens 5, wherein the grinding device 23 includes a square seat 25, a mounting box 28 is fixedly mounted on the square seat 25, a water tank 31 is fixedly arranged on the mounting box 28, four evenly distributed stabilizing plates 27 are fixedly arranged at the lower end of the mounting box 28, the stabilizing plates 27 are fixedly connected to the front and rear side walls of the square seat 25, a T-shaped plate 39 is fixedly connected between the left and right opposite stabilizing plates 27, and the T-shaped The plate 39 is fixedly connected to the front and rear side walls of the square seat 25, the upper end of the T-plate 39 is fixedly connected to the installation box 28, and telescopic clamping rods 51 are symmetrically arranged in the front and rear of the square seat 25. The telescopic clamping rod 51 on the rear side is rotatably connected to the rear side wall of the square seat 25, and the telescopic clamping rod 51 on the rear side is rotated to penetrate the T-plate 39 on the rear side, and the telescopic clamping rod 51 on the front side is rotated to extend out of the T-plate 39 and the square seat 25 on the front side. A connecting plate 53 is fixedly arranged on the front side of the square seat 25, and a grinding motor 54 is fixedly arranged on the connecting plate 53. The rear output end of the grinding motor 54 is fixedly connected to the telescopic clamping rod 51 on the front side, and a grinding block 34 is also installed in the square seat 25.

[0062] Preferably, a rotating rod 50 is rotatably connected between the front and rear opposite stabilizing plates 27, and a front and rear symmetrical gear 52 is fixedly arranged on the rotating rod 50. A polishing block 26 is fixedly arranged on the left rotating rod 50, and the polishing block 26 is arranged between the two gears 52 on the left. A grinding block 34 is fixedly arranged on the right rotating rod 50, and the grinding block 34 is arranged between the two gears 52 on the right. A channel 35 is also arranged on the grinding block 34; a lifting plate 58 is slidably arranged in the installation box 28, and the installation box A lifting drive member 29 is symmetrically installed on 28, the lower output end of the lifting drive member 29 slides and extends into the installation box 28, and the lower output end of the lifting drive member 29 is fixedly connected to the lifting plate 58, and a lifting block 33 is fixedly set on the lower end of the lifting plate 58. The lifting block 33 slides and extends out of the installation box 28, and a driving plate 36 is fixedly set on the lower end of the lifting block 33. A tooth plate 57 is fixedly set on one side of the driving plate 36 close to the square seat 25, and the tooth plate 57 is meshed and connected with the gear 1 52.

[0063] The working principle and beneficial effects of the above technical solution are as follows: the cut semi-finished lens is placed in the square seat 25, and then the two telescopic clamping rods 51 are driven to move toward each other to clamp the semi-finished lens. At this time, the grinding motor 54 is started, and the grinding motor 54 drives the telescopic clamping rod 51 on the front side to rotate, so that the semi-finished lens and the telescopic clamping rod 51 on the rear side rotate together. During the rotation process, the lifting drive member 29 is started to drive the lifting plate 58 to descend, and the lifting plate 58 drives the lifting block 33 to descend. The lifting block 33 descends and drives the driving plate 36 to descend. The toothed plate 57 on the driving plate 36 drives the gear 1 52 to rotate, and the gear 1 52 drives the rotating rod 50 to rotate. The rotating rod 50 drives the polishing block 26 to rotate clockwise, and the rotating rod 50 drives the grinding block 34 to rotate counterclockwise, so that the grinding block 34 and the polishing block 26 are in close contact with the semi-finished lens, and then as the finished lens rotates clockwise (such as Figure 5 As shown in the figure, the grinding block 34 grinds the semi-finished lens, and the material dropped by grinding falls into the square seat 25 through the channel 35. The polishing block 26 polishes the semi-finished lens. At the same time, the descending length of the driving plate 36 can be changed, thereby changing the contact angle and contact force between the grinding block 34 and the polishing block 26 and the semi-finished lens, and can also play a role of simple grinding, which effectively improves the practicability and functionality of the device. The provision of the polishing block 26 can effectively complete the polishing effect of the semi-finished lens, prevent the burrs of the semi-finished lens from causing damage to human hands, and effectively improve safety.

[0064] Example 6

[0065] On the basis of the above-mentioned embodiment 5, Figure 6-9 As shown, a cylinder 41 is installed in the center of the lifting plate 58, and a bellows 40 is connected to the cylinder 41. Corresponding holes are opened on the upper surface of the installation box 28 and the lower surface of the water tank 31. The other end of the bellows 40 passes through the hole and is connected to the water tank 31. A water outlet pipe 42 is fixedly installed at the lower end of the cylinder 41. The water outlet pipe 42 slides and extends out of the installation box 28, and a water spray plate 49 is provided at the outlet end of the water outlet pipe 42; a rotating block 43 is rotatably arranged in the cylinder 41, and a plurality of grooves 48 are arranged on the rotating block 43. A spring 44 is arranged in the groove 48, one end of the spring 44 is fixedly connected in the groove 48, and the other end of the spring 44 is fixedly connected to the water push plate 47, and the water push plate 47 is slidably connected to the inner wall of the groove 48, and two limit retaining rings 46 are also arranged in the groove 48.

[0066] Among them, preferably, a rotating shaft 45 is fixedly provided at the center of the rotating block 43, a slide groove is provided on the rear side wall of the installation box 28, the rear side of the rotating shaft 45 is slidably connected to the slide groove, a through groove 2 30 is provided on the front side wall of the installation box 28, the rotating shaft 45 extends from the through groove 2 30 out of the installation box 28, and a gear 2 32 is also fixedly provided on the front side of the rotating shaft 45; a pulley 1 38 is fixedly provided on the rear output end of the grinding motor 54, and a rotating shaft is also rotatably connected on the front side wall of the square seat 25, a pulley 2 55 and a gear 3 56 are fixedly provided on the rotating shaft, and a belt 37 is wound around the pulley 1 38 and the pulley 2 55.

[0067] The working principle and beneficial effects of the above technical solution are as follows: when the lifting plate 58 descends, the lifting plate 58 will drive the cylinder 41 to descend at the same time, the cylinder 41 drives the rotating shaft 45 to descend, the rotating shaft 45 drives the gear 2 32 to descend, the gear 2 32 is meshed with the gear 3 56, when the grinding motor 54 is started (first make the gear 2 32 mesh with the gear 3 56, and then start the grinding motor 54 to reduce the possibility of tooth breaking), the pulley 1 38 will start to rotate, the pulley 1 38 drives the pulley 2 55 to rotate through the belt 37, the pulley 2 55 drives the rotating shaft to rotate, the rotating shaft drives the gear 3 56 to rotate, the gear 3 56 drives the gear 2 32 to rotate, the gear 2 32 drives the rotating shaft 45 to rotate, and the rotating shaft 45 drives the plurality of grooves 48 to rotate When one of the grooves 48 is aligned with the bellows 40, water will enter one of the grooves 48, and the water will push the water push plate 47 to move, and the water push plate 47 will compress the spring 44. When the rotating shaft 45 continues to rotate, the cooperation between the groove 48 and the cylinder 41 makes the groove 48 form a closed space. When the groove 48 is aligned with the water outlet pipe 42, under the action of gravity and the elastic force of the spring 44, water will enter the water outlet pipe 42. The water entering the water outlet pipe 42 will be dispersed by the water spray plate 49 and sprayed onto the semi-finished lens, so that the semi-finished lens can be effectively cooled and cleaned (at the same time, the two limit retaining rings 46 will play a limiting function to prevent damage caused by excessive water pressure or elastic force);

[0068] The remaining grooves 48 will also continuously store and flow water as described above, thereby effectively completing the water transfer work; the water spray plate 49 can be completed by lowering the lifting plate 58; the water discharge from the water spray plate 49 and the contact between the grinding block 34 and the polishing block 26 and the semi-finished lens effectively improve the innovation of the device; and the grinding motor 54 is set to drive the rotation of the semi-finished lens, and the rotation of the rotating shaft 45 can effectively complete the grinding and polishing operation of the semi-finished lens, and at the same time, the functions of continuously receiving, storing and releasing water in the grooves 48 can also be completed, which is highly practical.

[0069] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. If these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An F-theta scanning lens for a high-speed scanning 3D printer, characterized in that: The invention comprises lens 1 (1), lens 2 (2), lens 3 (3), lens 4 (4) and lens 5 (5) which are sequentially arranged along the direction of incident light, lens 1 (1) is a meniscus negative lens with its curved surface facing the incident light, lens 2 (2) is a meniscus negative lens with its curved surface facing the incident light, lens 3 (3) is a positive lens, lens 4 (4) is a positive lens, and lens 5 (5) is a meniscus positive lens with its curved surface facing the incident light, and the field of view angle of the F-theta scanning lens is ±25°; Lens 1 (1) comprises curved surface 1 (101) and curved surface 2 (102), curved surface 1 (101) is close to the incident light direction, the curvature radius of curved surface 1 (101) is -66.713 to -58.362 mm, the curvature radius of curved surface 2 (102) is -73.586 to -65.791 mm, the center thickness of lens 1 (1) is 12.56 mm to 17.68 mm, the refractive index of lens 1 (1) is 1.76 to 1.88, and the Abbe number of lens 1 (1) is 27.373; Lens 2 (2) includes curved surface 3 (201) and curved surface 4 (202), curved surface 3 (201) is close to lens 1 (1), the radius of curvature of curved surface 3 (201) is -186.362 to -167.647 mm, the radius of curvature of curved surface 4 (202) is -213.846 to -245.257 mm, the center thickness of lens 2 (2) is 13.62 to 18.71 mm, the refractive index of lens 2 (2) is 1.76 to 1.88, and the Abbe number of lens 2 (2) is 27.373; Lens three (3) includes curved surface five (301) and curved surface six (302), curved surface five (301) is close to lens two (2), the radius of curvature of curved surface five (301) is -687.752 to -754.422 mm, the radius of curvature of curved surface six (302) is -198.963 to -247.853 mm, the center thickness of lens three (3) is 19.25 to 24.75 mm, the refractive index of lens three (3) is 1.37 to 1.68, and the Abbe number of lens three (3) is 66.293; Lens four (4) includes curved surface seven (401) and curved surface eight (402), curved surface seven (401) is close to lens three (3), the radius of curvature of curved surface seven (401) is -2347.761 to -2678.624 mm, the radius of curvature of curved surface eight (402) is -534.458 to -614.856 mm, the center thickness of lens four (4) is 8.61 to 10.23 mm, the refractive index of lens four (4) is 1.37 to 1.68, and the Abbe number of lens four (4) is 66.293; Lens five (5) includes curved surface nine (501) and curved surface ten (502), curved surface nine (501) is close to lens four (4), the radius of curvature of curved surface nine (501) is -586.324 to -678.985 mm, the radius of curvature of curved surface ten (502) is -297.856 to 386.497 mm, the center thickness of lens five (5) is 18.76 to 13.87 mm, the refractive index of lens five (5) is 1.37 to 1.68, and the Abbe number of lens five (5) is 66.293.

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