A laser beam focusing mechanism

Abstract

The present invention provides a laser beam focusing mechanism, which includes a mounting frame, a focusing driving device and a plurality of lens assemblies. The mounting frame is divided into a plurality of mounting units, and the plurality of lens assemblies are arranged in an array. Each of the lens assemblies is respectively disposed in one of the mounting units. The focusing driving devices correspond to the lens assemblies one by one. The mounting ends of the focusing driving devices are all connected to the mounting frame, and the driving ends of the focusing driving devices are respectively connected to one of the lens assemblies. The focusing driving device is used to drive the lens assembly to move back and forth. Since the laser beam focusing mechanism of the present invention includes a plurality of lens assemblies arranged in an array, and each lens assembly is connected with a focusing driving device, not only the beam energy is improved, but also the focusing accuracy, the target hitting accuracy of the laser beam and the focal spot quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of large laser devices, and more particularly, to a laser beam focusing mechanism. Background Art

[0002] In recent years, large laser systems have gradually evolved towards high energy, miniaturization, and high efficiency. Among them, achieving high-efficiency target shooting with third-harmonic generation lasers is the focus of the current laser research field. The terminal optical subsystem is an important part of the target field system, which is composed of multiple functional modules, such as a harmonic conversion module, a beam focusing module, a vacuum target chamber connection module, an environmental protection module, etc. The main function of the beam focusing module is to achieve precise focusing adjustment of the third-harmonic generation laser. For existing laser beam focusing components, multiple lens assemblies are used for focusing to increase the energy of the laser beam, but there is a problem of low focusing accuracy between multiple lens assemblies, resulting in low target shooting accuracy and low focal spot quality of the laser beam. Summary of the Invention

[0003] The problem solved by the present invention is to provide a laser beam focusing mechanism with high beam energy and high focusing accuracy.

[0004] To solve the above problems, the present invention provides a laser beam focusing mechanism, including a mounting frame, a focusing drive device, and multiple lens assemblies.

[0005] The mounting frame is divided into multiple mounting units.

[0006] The multiple lens assemblies are arranged in an array, and each lens assembly is respectively arranged in one of the mounting units. The focusing drive devices correspond to the lens assemblies one by one. The mounting ends of each focusing drive device are connected to the mounting frame, and the driving ends of each focusing drive device are respectively connected to one of the lens assemblies. The focusing drive device is used to move the lens assembly back and forth.

[0007] Further, a set of lens assembly fixing plates is provided in each mounting unit. The lens assembly includes a lens bottom plate and an optical element, and the optical element is connected to the lens bottom plate. The lens bottom plate includes a first side plate and a second side plate corresponding to each other. The first side plate and the second side plate of each lens assembly are respectively connected to a set of lens assembly fixing plates.

[0008] Further, guide rails are provided on the lens assembly fixing plates. The first side plate and the second side plate are two side plates of the lens bottom plate parallel to the installation direction, and the first side plate and the second side plate are adapted to slide relative to the guide rails of the lens assembly fixing plates.

[0009] Further, a focusing drive fixing plate is further provided in each of the mounting units. The focusing drive fixing plate is connected between the group of lens assembly fixing plates, and the mounting end of the focusing drive device is provided on the focusing drive fixing plate.

[0010] Further, there are eight lens assemblies in total, and the eight lens assemblies are arranged in a rectangular array.

[0011] Further, the optical element is adjustable in the front-back direction relative to the lens bottom plate.

[0012] Further, the lens assembly further includes a lens frame, at least two first adjustment pads, and at least two first stoppers.

[0013] The lens frame is detachably connected to the lens bottom plate. The lens frame includes a bottom edge and side edges. The bottom edge and the side edges are perpendicular to each other, and the bottom edge and the side edges are all connected to form a receiving space for accommodating the optical element. At least two first adjustment holes are provided on the bottom edge.

[0014] The optical element is disposed in the receiving space.

[0015] Each of the first adjustment pads is respectively disposed in one of the first adjustment holes, and the height of each of the first adjustment pads in the first adjustment hole is adjustable. The first adjustment pad contacts the bottom surface of the optical element.

[0016] Each of the first stoppers is respectively disposed at different positions on the side edges. The height of each of the first stoppers relative to the side edges is adjustable. Each of the first stoppers contacts the top surface of the optical element to limit the position of the optical element in the front-back direction.

[0017] Further, the side edges include a first side edge and a second side edge, and each of the first stoppers is respectively disposed on the first side edge and the second side edge.

[0018] Further, the left-right distance between the optical element and the lens frame is adjustable.

[0019] Further, it further includes at least one second adjustment pad and at least one second stopper. The side edge further includes a third side edge.

[0020] A second adjustment hole is provided on the third side edge. The second adjustment pads are respectively disposed in one of the second adjustment holes, and the position of the second adjustment pads relative to the third side edge in the direction perpendicular to the third side edge is adjustable.

[0021] The second stopper is disposed at a position near the right side of the bottom edge, and the left-right position of the second stopper relative to the bottom edge is adjustable.

[0022] The left side of the optical element abuts against the second adjustment pad, and the right side of the optical element abuts against the second stopper.

[0023] Furthermore, the vertical distance between the optical element and the lens frame is adjustable.

[0024] Furthermore, it further includes at least two third adjustment pads. The side includes a first side and a second side.

[0025] Third adjustment holes are respectively formed in the first side and the second side.

[0026] The third adjustment pads are respectively arranged in the third adjustment holes on the first side and the second side. The third adjustment pads are adjustable in position in a direction perpendicular to the first side or the second side relative to the first side or the second side.

[0027] The front and rear sides of the optical element respectively abut against the third adjustment pads on the first side and the third adjustment pads on the second side.

[0028] Since the laser beam focusing mechanism of the present invention includes a plurality of lens assemblies arranged in an array, and each lens assembly is connected with a focusing driving device, not only the beam energy is increased, but also the front and rear positions of each lens assembly can be adjusted according to needs, so as to facilitate the lens focusing of all the lens assemblies of the entire laser beam focusing mechanism, and improve the focusing accuracy, the target hitting accuracy of the laser beam and the spot quality. Description of the Drawings

[0029] Figure 1 It is an axonometric view of the laser beam focusing mechanism of the embodiment of the present invention;

[0030] Figure 2 It is an axonometric view of the laser beam focusing mechanism of the embodiment of the present invention after removing the frame flange;

[0031] Figure 3 It is an assembly drawing of the lens assembly in the laser beam focusing mechanism of the embodiment of the present invention;

[0032] Figure 4 It is an exploded view of the lens assembly in the laser beam focusing mechanism of the embodiment of the present invention.

[0033] Description of the Reference Numerals:

[0034] 01 - Mounting bracket; 11 - Lens assembly fixing plate; 12 - Focus adjustment driving fixing plate; 13 - Support side plate; 04 - Each lens assembly; 41 - Lens bottom plate; 411 - First side plate; 412 - Second side plate; 413 - Third side plate; 414 - Handle; 42 - Lens frame; 421 - Bottom edge; 422 - First side edge; 423 - First adjustment hole; 424 - Second side edge; 425 - Third side edge; 426 - Vertical surface guide roller; 427 - Side guide roller; 428 - Fourth side edge; 429 - Guide strip; 43 - Optical element; 46 - Limit post; 47 - Limit post groove; 51 - First adjustment pad; 52 - First stop block; 53 - Second adjustment pad; 54 - Second stop block; 55 - Third adjustment pad; 56 - Third stop block; 06 - Frame flange. Detailed implementation manners

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0036] If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0037] As Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of a laser beam focusing mechanism of the present invention includes a mounting bracket 01, a focus adjustment driving device 02, and multiple lens assemblies 04. The multiple lens assemblies 04 are arranged in an array. Each lens assembly 04 is disposed on the mounting bracket 01. The mounting bracket 01 is divided into multiple mounting units, and each lens assembly 04 is respectively disposed in one mounting unit. The focus adjustment driving devices 02 correspond to the lens assemblies 04 one by one. The mounting ends of each focus adjustment driving device 02 are disposed on the mounting bracket 01. The focus adjustment driving device 02 is used to drive the lens assembly 04 to move back and forth relative to the mounting bracket 01. Back and forth refers to the direction along the X-axis in the coordinate system, so as to adjust the front and back positions of the lens assembly 04. Since the laser beam focusing mechanism of the present invention includes multiple lens assemblies 04 arranged in an array, and each lens assembly 04 is connected with a focus adjustment driving device 02, not only the beam energy is increased, but also the front and back positions of each lens assembly 04 can be adjusted as needed, thus facilitating the lens focusing of all the lens assemblies 04 of the entire laser beam focusing mechanism, improving the focusing accuracy, the target hitting accuracy of the laser beam, and the focal spot quality.

[0038] Optionally, a set of lens assembly fixing plates 11 is provided in each installation unit. Each set of lens assembly fixing plates 11 includes a lens assembly fixing plate above the installation unit and a lens assembly fixing plate below the installation unit. Above refers to the positive direction of the Z-axis in the coordinate system, and below refers to the negative direction of the Z-axis in the coordinate system. Each lens assembly 04 includes a lens bottom plate 41 and an optical element 43. The optical element 43 is connected to the lens bottom plate 41. The optical element 43 is a lens group for focusing the light beam. The lens bottom plate 41 is used to install the lens assembly. When the lens assembly is in use, it needs to be installed in a light beam focusing module or other usage environments. The lens bottom plate 41 is used to connect to the light beam focusing module. The lens bottom plate 41 includes corresponding first side plates 411 and second side plates 412. The first side plates 411 and second side plates 412 of each lens assembly 04 are respectively connected to a set of lens assembly fixing plates 11.

[0039] Optionally, guide rails are provided on the lens assembly fixing plates 11. The first side plates 411 and second side plates 412 are two side plates of the lens bottom plate 41 parallel to the installation direction. The first side plates 411 and second side plates 412 are each adapted to slide relative to the lens assembly fixing plates 11. Specifically, the lens bottom plate 41 further includes corresponding third side plates 413 and fourth side plates. The third side plates 413 and fourth side plates are respectively connected between the first side plates 411 and the second side plates 412. A handle 414 is provided on the third side plate 413. When installing the lens assembly 04, the lens bottom plate 41 is pushed and pulled through the handle 414 to make the first side plates 411 and second side plates 412 slide relative to the guide rails on a set of lens assembly fixing plates 11 respectively, making the installation of the lens assembly 04 more convenient.

[0040] Optionally, as Figure 1 , Figure 2 shown, a focusing drive fixing plate 12 is further provided in each installation unit. The focusing drive fixing plate 12 is connected between the right ends of two lens assembly fixing plates 11 facing each other. The installation ends of each focusing drive device 02 are provided on the focusing drive fixing plate 12. Specifically, the focusing drive fixing plate 12 and the two lens assembly fixing plates 11 are connected to each other by a plurality of screws. Between the left ends of the two lens assembly fixing plates 11 facing each other, a support side plate 13 is connected by a plurality of screws. The focusing drive device 02 can adopt a screw device or a hydraulic cylinder device. Due to the setting of the focusing drive fixing plate 12, the installation of the focusing drive device 02 is made more convenient.

[0041] Optionally, the mounting bracket 01 is divided into nine units arranged in a rectangular array. The unit at the center of the rectangular array is vacant, and the remaining eight units are installation units. A total of eight groups of lens assemblies 04 are provided, and each lens assembly 04 is respectively arranged in an installation unit.

[0042] Optionally, the front and rear sides of the mounting bracket 01 are respectively connected to a frame flange 06, and the laser beam focusing mechanism of the present invention is connected to the housing of the terminal optical system through the frame flange 06.

[0043] Optionally, as Figure 3 , Figure 4 shown, the position of the optical element 43 relative to the lens base plate 41 is adjustable in the front and rear directions, and the front and rear directions refer to the direction along the X-axis in the coordinate system.

[0044] Since the position of the optical element 43 relative to the lens base plate 41 is adjustable in the front and rear directions, it is convenient to accurately adjust the relative position between the optical element and other devices during use, improving the focusing accuracy of the laser beam focusing mechanism.

[0045] Optionally, as Figure 3 , Figure 4 shown, the lens assembly 04 further includes a lens frame 42, a first adjusting pad 51, and a first stopper 52.

[0046] The lens frame 42 is detachably connected to the lens base plate 41 by bolts or other connecting members. The lens frame 42 includes a bottom edge 421 and side edges. The bottom edge 421 and the side edges are perpendicular to each other, and the bottom edge 421 and the side edges are all connected to form an accommodation space for accommodating the optical element 43. The optical element 43 is disposed in the accommodation space, and the lens illumination light source is disposed inside the side edge. The light emitted by the lens illumination light source is focused after passing through the optical element 43. Two first adjustment holes 423 are formed on the bottom edge 421, and the two first adjustment holes 423 are distributed on the corresponding two sides of the bottom edge 421. Alternatively, multiple first adjustment holes 423 can be formed, and the multiple first adjustment holes 423 are distributed on different sides of the bottom edge 421.

[0047] The number of the first adjusting pads 51 is equal to the number of the first adjustment holes 423. Each first adjusting pad 51 is respectively disposed in a first adjustment hole 423, and the height of each first adjusting pad 51 in the first adjustment hole 423 is adjustable. Each first adjusting pad 51 is in contact with the bottom surface of the optical element 43. Specifically, each first adjusting pad 51 is respectively connected to each first adjustment hole 423 by screws.

[0048] Two or more first stoppers 52 are provided. Each first stopper 52 is respectively disposed at different positions on the side edge, and the height of each first stopper 52 relative to the side edge is adjustable. Each first stopper 52 is in contact with the top surface of the optical element 43 and is used to limit the position of the optical element 43 in the front and rear directions. Optionally, a lead screw is provided on the side edge, a lead screw nut is connected to the lead screw, and the first stopper 52 is connected to the lead screw nut. Rotating the lead screw is used to adjust the height of the first stopper 52 relative to the side edge.

[0049] When it is necessary to adjust the relative position of the optical element 43 and the lens frame 42 in the front-back direction, loosen each first stopper 52, adjust the height of the first adjustment pad 51 relative to the bottom edge 421, and lock each first stopper 52 after the adjustment is in place.

[0050] Optionally, the side includes a first side 422 and a second side 424, and each first stopper 52 is respectively arranged on the first side 422 and the second side 424. The first stoppers 52 are respectively arranged on the first side 422 and the second side 424, making the connection between the optical element 43 and the lens frame 42 more stable.

[0051] Optionally, the left-right distance between the optical element 43 and the lens frame 42 is adjustable. Left and right refer to the direction along the Y-axis in the coordinate system. Since the left-right distance between the optical element 43 and the lens frame 42 is adjustable, the position of the optical element can be finely adjusted as needed during use, further improving the focusing accuracy of the laser beam focusing mechanism.

[0052] Optionally, an embodiment of a lens assembly of the present invention further includes a second adjustment pad 53 and a second stopper 54, and the side further includes a third side 425.

[0053] A second adjustment hole is provided on the third side 425, and each second adjustment pad 53 is respectively arranged in one second adjustment hole. The second adjustment pad 53 can extend out of the second adjustment hole and abut against the optical element 43. The position of the second adjustment pad 53 relative to the third side 425 in the direction perpendicular to the third side 425 is adjustable. One or more second adjustment pads 53 are provided, and the number of second adjustment holes is equal to the number of second adjustment pads 53.

[0054] The second stopper 54 is arranged at a position on the bottom edge 421 close to the right side, and the position of the second stopper 54 relative to the bottom edge 421 is adjustable left and right. Specifically, two or more connection holes are provided on the second stopper 54, and the second stopper 54 is connected to the bottom edge 421 through different connection holes, so that the second stopper 54 is in different positions on the bottom edge 421.

[0055] The left side of the optical element 43 abuts against the second adjustment pad 53, and the right side of the optical element 43 abuts against the second stopper 54.

[0056] When it is necessary to adjust the left-right position of the optical element 43, adjust the position of the second adjustment pad 53 relative to the third side 425, and at the same time adjust the position of the second stopper 54, so that the right side of the adjusted optical element 43 abuts against the second stopper 54.

[0057] Optionally, the vertical distance between the optical element 43 and the lens frame 42 is adjustable. "Vertical" refers to the direction along the Z-axis in the coordinate system. Since the vertical distance between the optical element 43 and the lens frame 42 is adjustable, the position of the optical element can be finely adjusted as needed during use, further improving the focusing accuracy of the laser beam focusing mechanism.

[0058] Optionally, an embodiment of the lens assembly of the present invention further includes a third adjustment pad 55. The side includes a first side 422 and a second side 424.

[0059] Third adjustment holes are respectively formed on the first side 422 and the second side 424.

[0060] Two third adjustment pads 55 are provided. The two third adjustment pads 55 are respectively arranged in the third adjustment holes on the first side 422 and the second side 424. The position of the third adjustment pad 55 relative to the first side 422 or the second side 424 is adjustable in a direction perpendicular to the first side 422 or the second side 424. Alternatively, multiple third adjustment pads 55 are provided. The multiple third adjustment pads 55 are respectively arranged on the first side and the second side. The number of the third adjustment holes is equal to the number of the third adjustment pads 55. Each third adjustment pad 55 is respectively arranged in one third adjustment hole.

[0061] The upper and lower sides of the optical element 43 respectively abut against the third adjustment pads 55 on the first side 422 and the third adjustment pads 55 on the second side 424.

[0062] Optionally, a side guide roller 427 and a vertical surface guide roller 426 are provided on the outer wall of the first side 422. One or more side guide rollers 427 are provided. Two or more vertical surface guide rollers 426 are provided. The surface of the side guide roller 427 protrudes from the outer wall of the first side 422. Some of the vertical surface guide rollers 426 protrude from the top surface of the first side 422, and some of the vertical surface guide rollers 426 protrude from the bottom surface of the first side 422. The same side guide roller 427 and vertical surface guide roller 426 as those on the first side 4 are provided on the second side 24.

[0063] Optionally, both the lens frame 42 and the optical element 43 are wedge-shaped. A guide strip 429 is provided on the outer wall of the first side 422. The guide strip 429 is a rectangular parallelepiped rod parallel to the first side 422. The side guide roller 427 and the vertical surface guide roller 426 are rotatably arranged on the guide strip 429. The surface of the side guide roller 427 protrudes from the outer wall of the guide strip 429. Some of the vertical surface guide rollers 426 protrude from the top surface of the guide strip 429, and some of the vertical surface guide rollers 426 protrude from the bottom surface of the guide strip 429.

[0064] Due to the arrangement of the side guiding roller 427 and the vertical guiding roller 426, it is convenient for the lens frame 42 to roll relative to the contact surface when installing the lens assembly, making the installation more convenient.

[0065] Optionally, a leftward limiting device and a rightward limiting device are provided between the lens bottom plate 41 and the lens frame 42. Due to the provision of the leftward limiting device and the rightward limiting device between the lens bottom plate 41 and the lens frame 42, when installing the lens frame 42 and the lens bottom plate 41, it prevents the lens frame 42 and the lens bottom plate 41 from being misaligned with each other.

[0066] Optionally, the side of the lens frame 42 further includes a fourth side 428, and the rightward limiting device is a third stopper 56 connected to the fourth side 428, and the third stopper 56 extends out of the side of the lens frame 42 facing the lens bottom plate 41.

[0067] Optionally, a connection hole is provided on the third stopper 56, and the connecting member between the lens bottom plate 41 and the lens frame 42 is arranged in the connection hole, so that the lens frame 42 and the lens bottom plate 41 are detachably connected. Specifically, one or more third stoppers 56 are provided. When multiple third stoppers 56 are provided, the multiple third stoppers 56 are respectively located on both sides of the leftward limiting device.

[0068] Optionally, the leftward limiting device includes a limiting column 46 and a limiting column groove 47. The limiting column 46 is arranged on the lens frame 42, the limiting column 46 is telescopic, the limiting column groove 47 is arranged on the lens bottom plate 41, and when the limiting column 46 extends out, it is placed in the limiting column groove 47. Alternatively, the limiting column 46 is arranged on the lens bottom plate 41, and the limiting column groove 47 is arranged on the lens frame 42.

[0069] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A laser beam focusing mechanism, characterized in that: It comprises a mounting frame (01), a focusing drive device (02) and a plurality of lens assemblies (04), The mounting frame (01) is divided into a plurality of mounting units. The plurality of lens assemblies (04) are arranged in an array, each lens assembly (04) is respectively arranged in one of the mounting units, the focus drive device (02) corresponds to the lens assembly (04) one by one, the mounting end of each focus drive device (02) is connected to the mounting frame (01), the driving end of each focus drive device (02) is respectively connected to one of the lens assemblies (04), and the focus drive device (02) is used to drive the lens assembly (04) to move forward and backward; The lens assembly (04) comprises a lens base plate (41), a lens frame (42), at least two first adjustment pads (51), at least two first stoppers (52), and an optical element (43); The lens frame (42) is detachably connected to the lens base plate (41), the lens frame (42) comprises a bottom edge (421) and side edges, the bottom edge (421) and the side edges are perpendicular to each other, the bottom edge (421) and the side edges are connected to each other, the bottom edge (421) and the side edges form a receiving space for accommodating the optical element (43), and at least two first adjustment holes (423) are provided on the bottom edge (421); The optical element (43) is arranged in the accommodating space; Each first adjustment pad (51) is respectively arranged in one of the first adjustment holes (423); the height of each first adjustment pad (51) in the first adjustment hole (423) is adjustable; and the first adjustment pad (51) contacts the bottom surface of the optical element (43); Each of the first stops (52) is respectively arranged at a different position of the side edge, and the height of each of the first stops (52) relative to the side edge is adjustable. Each of the first stops (52) contacts the top surface of the optical element (43) and is used to limit the position of the optical element (43) in the front-back direction.

2. The laser beam focusing mechanism according to claim 1, characterized in that: A group of lens assembly fixing plates (11) is provided in each of the mounting units. The optical element (43) is connected to the lens base plate (41). The lens base plate (41) includes a first side plate and a second side plate corresponding to each other. The first side plate and the second side plate of each of the lens assemblies (04) are respectively connected to a group of the lens assembly fixing plates (11).

3. The laser beam focusing mechanism according to claim 2, characterized in that: A guide rail is provided on the lens assembly fixing plate (11); the first side plate (411) and the second side plate (412) are two side plates of the lens base plate (41) that are parallel to the installation direction; the first side plate and the second side plate are suitable for sliding relative to the guide rail of the lens assembly fixing plate (11).

4. The laser beam focusing mechanism according to claim 2, wherein: A focus drive fixing plate (12) is further provided in each of the mounting units. The focus drive fixing plate (12) is connected between the group of lens assembly fixing plates (11), and the mounting end of the focus drive device (02) is provided on the focus drive fixing plate (12).

5. The laser beam focusing mechanism according to claim 1, wherein: A total of eight lens assemblies (04) are provided, and the eight lens assemblies (04) are arranged in a rectangular array.

6. The laser beam focusing mechanism according to claim 2, characterized in that: The position of the optical element (43) relative to the lens base plate (41) is adjustable in the front-to-back direction.

7. The laser beam focusing mechanism according to claim 1, wherein: The side includes a first side (422) and a second side (424), and each of the first stoppers (52) is respectively arranged on the first side (422) and the second side (424).

8. The laser beam focusing mechanism according to claim 2, characterized in that: The left-right distance between the optical element (43) and the lens frame (42) is adjustable.

9. The laser beam focusing mechanism according to claim 8, characterized in that: It also includes at least one second adjustment pad (53), at least one second stopper (54), and the side also includes a third side (425). A second adjustment hole is provided on the third side (425), and the second adjustment pad (53) is respectively arranged in one of the second adjustment holes. The position of the second adjustment pad (53) relative to the third side (425) is adjustable in a direction perpendicular to the third side (425). The second stopper (54) is arranged at a position close to the right side of the bottom edge (421), and the left and right positions of the second stopper (54) relative to the bottom edge (421) are adjustable. The left side of the optical element (43) abuts against the second adjustment pad (53), and the right side of the optical element (43) abuts against the second stopper (54).

10. The laser beam focusing mechanism according to claim 2, characterized in that: The upper and lower distances between the optical element (43) and the lens frame (42) are adjustable.

11. The laser beam focusing mechanism according to claim 10, characterized in that: It also includes at least two third adjustment pads (55), the side edges including a first side edge (422) and a second side edge (424), A third adjustment hole is respectively provided on the first side (422) and the second side (424). The third adjustment pad (55) is respectively arranged in a third adjustment hole on the first side (422) and the second side (424), and the position of the third adjustment pad (55) is adjustable relative to the first side (422) or the second side (424) in a direction perpendicular to the first side (422) or the second side (424). The front and rear sides of the optical element (43) respectively rest on the third adjustment pad (55) on the first side (422) and the third adjustment pad (55) on the second side (424).

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