Integrated laser welding cleaning device

Abstract

The utility model relates to an integrated laser welding cleaning device which comprises a laser output system, a collimation system, a first wedge-shaped prism and a focusing system, and the first wedge-shaped prism is arranged between the collimation system and the focusing system. The first wedge-shaped prism is provided with two non-parallel planes and used for changing the deflection angle and direction of an incident laser beam, and welding laser and cleaning laser emitted by the laser output system are collimated by the collimation system to form collimated welding laser and collimated cleaning laser. The laser beams pass through the first wedge-shaped prism from the hollow part and the non-hollow part of the first wedge-shaped prism and then enter the focusing system to form focusing welding laser and focusing cleaning laser, and the focusing cleaning laser and the focusing welding laser enter a workpiece to be welded to clean and weld the workpiece. According to the utility model, the wedge-shaped prism is arranged to adjust the focusing position of the cleaning laser beam, so that the laser cleaning and the laser welding are synchronously carried out, and the laser welding efficiency and the welding quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser welding technical field, concretely relates to an integrated laser welding cleaning device. BACKGROUND

[0002] The cleanliness of the surface of the laser welding workpiece has a great influence on the welding effect, and even directly determines the welding strength, welding quality and the use repeatability of the welding parameters. The cleanliness of the surface of the workpiece in laser welding is a key problem that must be solved in high-power laser welding.

[0003] In the past laser welding, the rust removal and cleaning near the weld seam usually adopts the method of annular spot cleaning, but the annular spot disperses the intensity of the laser, and the average laser power of each point in space is low. The thickness of the rust on the surface of the thick plate is usually deep, and the surface is rougher, and may be accompanied by thicker oil stains, etc. The rust removal depth and cleaning effect of the annular spot cannot meet the needs of the thick plate surface cleaning work. And the annular spot cannot realize the cleaning work of the inner wall of the welding workpiece. Therefore, at present, the thick plate welding usually adopts the mode of cleaning and welding in steps, but this mode adopts two sets of systems of laser cleaning and laser welding, and the cleaning and welding processes are not synchronized, the degree of integration is low, the efficiency is low, and there are two gun heads of laser welding gun head and laser cleaning gun head, the use cost is higher.

[0004] In order to meet the needs of thick plate welding and promote the development of high-power laser welding, it is necessary to integrate the laser welding and laser cleaning system, and to develop an integrated laser welding cleaning system of high-power laser welding with large energy cleaning effect. CONTENT OF THE UTILITY MODEL

[0005] In view of the deficiencies of the background art, the utility model provides an integrated laser welding cleaning device, which comprises a laser output system, a collimation system, a first wedge prism and a focusing system, the first wedge prism is arranged between the collimation system and the focusing system;

[0006] The laser output system comprises a welding laser output head for emitting welding laser and a cleaning laser output head for emitting cleaning laser, and the cleaning laser output head is located on one side of the welding laser output head;

[0007] The collimation system comprises a first collimation system and a second collimation system, the first collimation system is arranged between the welding laser output head and the first wedge prism, and the second collimation system is arranged between the cleaning laser output head and the first wedge prism;

[0008] The first wedge prism has two non-parallel planes for changing the deflection angle and deflection direction of the laser beam entering the first wedge prism, and the first wedge prism is of a hollow structure.

[0009] The welding laser emitted by the welding laser output head is collimated by the first collimation system to form collimated welding laser, the collimated welding laser is emitted from the hollow part of the first wedge prism and then enters the focusing system, and the collimated welding laser is focused by the focusing system to form focused welding laser which is incident on the workpiece to be welded.

[0010] The cleaning laser emitted by the cleaning laser output head is collimated by the second collimation system to form collimated cleaning laser, the collimated cleaning laser is incident on the first wedge prism, and the exit angle and direction of the collimated cleaning laser are deflected by the first wedge prism to form first adjusted cleaning laser, the first adjusted cleaning laser is focused by the focusing system to form focused cleaning laser, and the focused cleaning laser is incident on the workpiece to be welded to clean the workpiece.

[0011] Further, the first adjusted cleaning laser is collimated laser.

[0012] Further, the device further comprises a first rotary motor for fixing the first wedge prism, the first rotary motor drives the first wedge prism to rotate to adjust the focusing position of the focused cleaning laser, and the focused cleaning laser rotates in a ring structure to clean different positions of the workpiece to be welded.

[0013] Further, the device is further provided with a second wedge prism, the second wedge prism is located between the first wedge prism and the focusing system, the second wedge prism is fixed by the second rotary motor, the second rotary motor drives the second wedge prism to rotate, the exit angle and direction of the first adjusted cleaning laser are deflected by the second wedge prism after the first adjusted cleaning laser is incident on the second wedge prism to form second adjusted cleaning laser, the second adjusted cleaning laser is incident on the focusing system to form the focused cleaning laser, and the focused cleaning laser cleans all positions around the welding spot and on the welding joint surface of the workpiece to be welded.

[0014] Further, the focusing spot of the focused cleaning laser is smaller than the spot of the focused welding laser.

[0015] Further, the rotation direction of the first wedge prism is determined by the rotation direction of the first rotary motor, and the rotation direction of the second wedge prism is determined by the rotation direction of the second rotary motor.

[0016] Further, the device further comprises a protection mirror for protecting the focusing system from being damaged by welding spatter, the protection mirror is located between the focusing system and the workpiece to be welded, and the protection mirror is a flat mirror.

[0017] Further, the first collimation system comprises a first collimation lens and a first collimation lens spherical aberration compensation lens, the second collimation system comprises a second collimation lens and a second collimation lens spherical aberration compensation lens, the focusing system comprises a focusing lens and a focusing lens spherical aberration compensation lens, the first collimation lens and the second collimation lens are biconvex lenses, the first collimation lens spherical aberration compensation lens and the second collimation lens spherical aberration compensation lens are plano-concave lenses, the first collimation lens spherical aberration compensation lens is used for compensating spherical aberration introduced by the first collimation lens to the collimated welding laser, and the second collimation lens spherical aberration compensation lens is used for compensating spherical aberration introduced by the second collimation lens to the collimated cleaning laser.

[0018] Further, the first collimation lens, the first collimation lens spherical aberration compensation lens, the second collimation lens, the second collimation lens spherical aberration compensation lens, the focusing lens and the focusing lens spherical aberration compensation lens are all coated with a film system that is transparent to laser.

[0019] Further, the utility model also provides an integrated laser welding and cleaning method, characterized in that: the method comprises:

[0020] The laser output system is started, the cleaning laser is emitted by the control cleaning laser output head, so that the second collimation lens in the collimation system collimates the cleaning laser into collimated cleaning laser, the collimated cleaning laser is incident to the non-hollow part of the first wedge prism, and the exit angle and exit direction of the collimated cleaning laser are deflected by the first wedge prism to form first adjusted cleaning laser.

[0021] The welding laser is emitted by the control welding laser output head, so that the first collimation lens in the collimation system collimates the welding laser into collimated welding laser, the collimated welding laser passes through the hollow part of the first wedge prism, and the focusing lens in the focusing system focuses the collimated welding laser into focused welding laser and then acts on the workpiece to be welded to weld the workpiece to be welded.

[0022] Further, the method further comprises that the first adjusted cleaning laser is incident to the non-hollow part of the second wedge prism, the exit angle and exit direction of the first adjusted cleaning laser are deflected by the second wedge prism to form second adjusted cleaning laser, and the second adjusted cleaning laser is incident to the focusing system and then focused by the focusing lens in the focusing system to form the focused cleaning laser.

[0023] The utility model provides a kind of integrated laser welding cleaning device, including but not limited to following beneficial effects: (1) laser welding and laser cleaning are integrated in one system, improve the integration of equipment, reduce the equipment quantity, reduce production cost and maintenance cost;(2) by setting wedge prism adjustment cleaning laser beam's focus position realizes that laser cleaning and laser welding are carried out simultaneously, simplify operation process, improve work efficiency;(3) by setting rotating motor drives wedge prism rotation, flexibly adjustment cleaning laser's deflection angle and deflection direction, so that focused cleaning laser can accurately aim at the region to be processed and present annular structure rotation, improve the flexibility and accuracy of processing, realize the cleaning of different positions of workpiece to be processed, improve cleaning effect, and can further improve welding effect;(4) by the setting of second wedge prism, the cleaning of all positions around welding spot and the surface of workpiece to be welded can be realized, further increase the coverage of cleaning. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description.

[0025] Figure 1 It is the whole structure schematic diagram of the utility model embodiment one;

[0026] Figure 2 It is still another structure schematic diagram of the utility model embodiment one;

[0027] Figure 3 It is the rotating schematic diagram of focused cleaning laser of the utility model embodiment one;

[0028] Figure 4 It is the structure schematic diagram of the utility model embodiment two;

[0029] Figure 5 It is the focused cleaning laser coverage position schematic diagram of the utility model embodiment two;

[0030] In the diagram, 1-laser output assembly, 2-collimation system, 3-first wedge prism, 4-focusing system, 5-first rotary motor, 6-second wedge prism, 7-second rotary motor, 8-protective mirror, 9-workpiece to be welded; 11-welding laser output head, 110-welding laser, 111-collimated welding laser, 112-focused welding laser, 12-cleaning laser output head, 120-cleaning laser, 121-collimated cleaning laser, 122-first adjustment cleaning laser, 123-second adjustment cleaning laser, 124-focused cleaning laser; 21-first collimation system, 210-first collimating mirror, 211-first collimating mirror spherical aberration compensation mirror, 220-second collimating mirror, 221-second collimating mirror spherical aberration compensation mirror; 401-focusing mirror, 402-focusing mirror spherical aberration compensation mirror. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] This application provides an integrated laser welding cleaning device, referring to... Figure 1 It includes a laser output system 1, a collimation system 2, a first wedge prism 3, and a focusing system 4, wherein the first wedge prism 3 is disposed between the collimation system 2 and the focusing system 4;

[0033] The laser output system 1 includes a welding laser output head 11 for emitting a welding laser 110 and a cleaning laser output head 12 for emitting a cleaning laser 120, with the cleaning laser output head 12 located on one side of the welding laser output head 11.

[0034] The collimation system 2 includes a first collimation system 21 and a second collimation system 22. The first collimation system 21 is disposed between the welding laser output head 11 and the first wedge prism 3, and the second collimation system 22 is disposed between the cleaning laser output head 12 and the first wedge prism 3.

[0035] The first wedge prism 3 has two non-parallel planes, which are used to change the deflection angle and deflection direction of the laser beam entering the first wedge prism 3. The first wedge prism 3 has a hollow structure in the middle.

[0036] In a preferred embodiment, refer to Figure 2The welding laser 110 emitted from the welding laser output head 11 is incident on the first collimation system 21. After being collimated by the first collimation system 21, it forms a collimated welding laser 111. The collimated welding laser 111 passes through the hollow position of the first wedge prism 3, thus maintaining its original emission direction, emission angle, and focusing characteristics. The collimated welding laser 111 is incident on the focusing system 4 and focused by the focusing system 4 to form a focused welding laser 112. The focused welding laser 112 is incident on the workpiece 9 to be welded for welding. At the same time, the cleaning laser 120 emitted from the cleaning laser output head 12 is incident on the second collimation system 22 and focused by the second collimation system 21 to form a focused welding laser 112. After collimation by the collimation system 22, a collimated cleaning laser 121 is formed. The collimated cleaning laser 121 is injected into the non-hollow position of the first wedge prism 3. The non-hollow position of the first wedge prism 3 consists of two non-parallel planes, which change the deflection angle and direction of the collimated cleaning laser 121 to obtain the first adjustment cleaning laser 122. The position and angle of the first adjustment cleaning laser 122 incident on the focusing system 4 are deflected compared to the collimated cleaning laser 121. After the first adjustment cleaning laser 122 is incident on the focusing system 4, it is focused to form the focused cleaning laser 124. The focused cleaning laser 124 performs laser cleaning and rust removal on the workpiece 9 to be welded.

[0037] By integrating laser welding and laser cleaning into a single design, multiple functions are combined, reducing the need for separate equipment and lowering costs. Simultaneously, welding and cleaning are performed continuously in one process, reducing the time spent transferring workpieces between different devices and improving production efficiency. By setting the first wedge prism 3, the deflection angle and direction of the collimated cleaning laser 121 beam are precisely controlled. The focusing system 4 ensures that laser energy is efficiently transferred to the workpiece without the beam being dispersed, improving the quality of laser cleaning, further enhancing welding quality, reducing welding defects, and increasing work efficiency.

[0038] Furthermore, the focused spot of the focused cleaning laser is smaller than the focused welding laser spot.

[0039] Furthermore, the first wedge prism 3 does not change the focal length of the collimating cleaning laser 121, thus the first adjusting cleaning laser 122 is a parallel laser. The parallel laser output makes it easier for the operator to adjust the position and angle of the cleaning laser output head to adapt to different cleaning needs.

[0040] Continue to refer to Figure 2The device also includes a first rotary motor 5 for fixing the first wedge prism 3. The first rotary motor 5 drives the first wedge prism 3 to rotate, thereby adjusting the focusing position of the focused cleaning laser 124. The focused cleaning laser 124 rotates in a ring structure to clean different positions of the workpiece 9 to be welded. In a preferred embodiment, the first wedge prism 3 is mounted on a fixed base, which rotates under the drive of the motor shaft of the first rotary motor 5. The first rotary motor 5 drives the focused cleaning laser 124 to rotate in a ring structure. Figure 3 The ring structure shown rotates, adjusting the rotation direction of the first rotary motor 5, so that the focused cleaning laser 124 can also be as shown. Figure 3 The rotation is in the opposite direction as shown. By setting the first rotary motor 5 to drive the first wedge prism 3 to rotate, the focused cleaning laser 124 can continuously clean different positions of the workpiece, which helps to improve the cleaning quality, ensure the cleanliness of the workpiece surface, and provide a good foundation for subsequent welding or other processing steps.

[0041] Furthermore, refer to Figure 4 In another preferred embodiment, the device further includes a second wedge prism 6, located between the first wedge prism 3 and the focusing system 4. The structure and function of the second wedge prism 6 are the same as those of the first wedge prism 3; both are hollow structures with two non-parallel planes, and both are used to change the deflection angle and direction of the incident laser beam. The second wedge prism 6 is fixed by a second rotary motor 7, which drives the second wedge prism 6 to rotate. After the first adjustment cleaning laser 122 is incident on the second wedge prism 6, its exit angle and direction are deflected by the second wedge prism 6, forming a second adjustment cleaning laser 123. The second adjustment cleaning laser 123, after being incident on the focusing system 3, forms a focused cleaning laser 124, which cleans all areas around the welding spot on the workpiece 9 to be welded. The addition of the second wedge prism 6 allows for a secondary adjustment of the exit angle and direction of the first adjustment cleaning laser 122, as described above. Figure 5 The combination of the first wedge prism 3 and the second wedge prism 6 enables the focused cleaning laser 124 to achieve complex spot rotation, covering all positions around the welding laser spot, adapting to a larger cleaning area and improving cleaning efficiency.

[0042] Furthermore, the rotation direction of the first wedge prism 3 is determined by the rotation direction of the first rotary motor 5, and the rotation direction of the second wedge prism 6 is determined by the rotation direction of the second rotary motor 7. By independently controlling the rotation of each prism, the deflection angle and direction of the cleaning laser beam can be adjusted more flexibly to adapt to different cleaning or welding needs, which helps to improve work efficiency and welding quality.

[0043] Furthermore, the device also includes a protective mirror 8 to protect the focusing system 3 from damage by welding spatter. The protective mirror 8 is located between the focusing system 3 and the workpiece 9 to be welded, and is a flat mirror. The protective mirror 8 prevents spatter and heat during the welding process from damaging the focusing system 4, thus enhancing the stability and durability of the integrated laser welding cleaning device.

[0044] Furthermore, the first collimation system 21 includes a first collimating lens 210 and a first collimating lens spherical aberration compensation lens 211, the second collimation system 22 includes a second collimating lens 220 and a second collimating lens spherical aberration compensation lens 221, and the focusing system 4 includes a focusing lens 401 and a focusing lens spherical aberration compensation lens 402. The first collimating lens 210 and the second collimating lens 220 are biconvex lenses, and the first collimating lens spherical aberration compensation lens 211 and the second collimating lens spherical aberration compensation lens 221 are plano-concave lenses. The first collimating lens spherical aberration compensation lens 211 is used to compensate for the spherical aberration introduced by the first collimating lens 210 to collimate the welding laser 111, and the second collimating lens spherical aberration compensation lens 221 is used to compensate for the spherical aberration introduced by the second collimating lens 220 to collimate the cleaning laser 121. By introducing spherical aberration compensation lenses, the spherical aberration of the welding laser beam and the cleaning laser beam is reduced, the quality of the laser beam is improved, and the cleaning and welding quality is further improved.

[0045] Furthermore, the first collimating lens 210, the first collimating lens spherical aberration compensation lens 211, the second collimating lens 220, the second collimating lens spherical aberration compensation lens 221, the focusing lens 401, and the focusing lens spherical aberration compensation lens 402 are all coated with a laser-transmitting film. By coating the lens surface with a laser-transmitting film, not only can the transmittance and utilization efficiency of the welding laser and the cleaning laser be improved, but the lenses can also be protected, heat-affected zones reduced, and welding and cleaning quality further improved, thus enhancing the performance of the entire integrated laser welding and cleaning device.

[0046] Furthermore, this utility model also provides an integrated laser welding cleaning method, referring to... Figure 2 ,include:

[0047] The laser output system 1 is activated, and the cleaning laser output head 12 is controlled to emit a cleaning laser 120. The second collimating lens 22 in the collimating system 2 collimates the cleaning laser 120 into a collimated cleaning laser 121. The collimated cleaning laser 121 is incident on the non-hollow part of the first wedge prism 3. The exit angle and exit direction of the collimated cleaning laser 121 are deflected by the first wedge prism 3 to form a first adjustment cleaning laser 122. The first adjustment cleaning laser 122 is a parallel laser. The focusing lens 401 in the focusing system 4 focuses the first adjustment cleaning laser 122 into a focused cleaning laser 124, which then acts on the workpiece 9 to be welded to clean the workpiece 9.

[0048] The welding laser output head 11 is controlled to emit a welding laser 110, so that the first collimating lens 210 in the collimating system 2 collimates the welding laser 110 into a collimated welding laser 111. The collimated welding laser 111 passes through the hollow part of the first wedge prism 3. The focusing lens 401 in the focusing system 4 focuses the collimated welding laser 111 into a focused welding laser 112, which then acts on the workpiece 9 to be welded to perform welding.

[0049] Through precise beam control and efficient focusing, cleaning and welding are integrated, improving production efficiency and product quality.

[0050] Furthermore, refer to Figure 4 The integrated laser welding cleaning method further includes: a first adjusting cleaning laser 122 is incident on the non-hollow part of a second wedge prism 6; the exit angle and exit direction of the first adjusting cleaning laser 122 are deflected by the second wedge prism 6 to form a second adjusting cleaning laser 123; the second adjusting cleaning laser 123 is incident on a focusing system 4 and focused by a focusing lens 401 in the focusing system 4 to form a focused cleaning laser 124; the focused cleaning laser 124 acts on the workpiece 9 to be welded to clean the workpiece 9. The secondary deflection of the first adjusting cleaning laser 122 helps to achieve a more uniform cleaning effect on the workpiece surface, especially for cleaning workpieces with complex shapes or hard-to-reach areas.

[0051] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An integrated laser welding cleaning device, characterized in that: It includes a laser output system (1), a collimation system (2), a first wedge prism (3) and a focusing system (4), wherein the first wedge prism (3) is disposed between the collimation system (2) and the focusing system (4); The laser output system (1) includes a welding laser output head (11) for emitting a welding laser (110) and a cleaning laser output head (12) for emitting a cleaning laser (120), the cleaning laser output head (12) being located on one side of the welding laser output head (11); The collimation system (2) includes a first collimation system (21) and a second collimation system (22). The first collimation system (21) is disposed between the welding laser output head (11) and the first wedge prism (3), and the second collimation system (22) is disposed between the cleaning laser output head (12) and the first wedge prism (3). The first wedge prism (3) has two non-parallel planes, which are used to change the deflection angle and deflection direction of the laser beam that enters the first wedge prism (3). The first wedge prism (3) has a hollow structure in the middle. The welding laser (110) emitted by the welding laser output head (11) is collimated by the first collimation system (21) to form a collimated welding laser (111). The collimated welding laser (111) passes through the hollow part of the first wedge prism (3) and enters the focusing system (4). After being focused by the focusing system (4) to form a focused welding laser (112), it is incident on the workpiece (9) to be welded. The cleaning laser (120) emitted by the cleaning laser output head (12) is collimated by the second collimation system (22) to form a collimated cleaning laser (121). After the collimated cleaning laser (121) is incident in the first wedge prism (3), the exit angle and exit direction of the collimated cleaning laser (121) are deflected by the first wedge prism (3) to form a first adjustment cleaning laser (122). The first adjustment cleaning laser (122) is focused by the focusing system (4) to form a focused cleaning laser (124). The focused cleaning laser (124) is incident on the workpiece (9) to be welded to clean the workpiece (9).

2. The integrated laser welding cleaning device according to claim 1, characterized in that: The first adjustment cleaning laser (122) is a collimated laser.

3. The integrated laser welding cleaning device according to claim 2, characterized in that: The device also includes a first rotary motor (5) for fixing the first wedge prism (3). The first rotary motor (5) drives the first wedge prism (3) to rotate in order to adjust the focusing position of the focused cleaning laser (124). The focused cleaning laser (124) rotates in a ring structure to clean different positions of the workpiece (9) to be welded.

4. The integrated laser welding cleaning device according to claim 3, characterized in that: The device is further provided with a second wedge prism (6), which is located between the first wedge prism (3) and the focusing system (4). The second wedge prism (6) is fixed by a second rotary motor (7). The second rotary motor (7) drives the second wedge prism (6) to rotate. After the first adjustment cleaning laser (122) is incident on the second wedge prism (6), its exit angle and exit direction are deflected by the second wedge prism (6) to form a second adjustment cleaning laser (123). After the second adjustment cleaning laser (123) is incident on the focusing system (4), it forms a focused cleaning laser (124). The focused cleaning laser (124) cleans all positions around the welding spot on the workpiece (9) to be welded.

5. The integrated laser welding cleaning device according to claim 4, characterized in that: The rotation direction of the first wedge prism (3) is determined by the rotation direction of the first rotary motor (5), and the rotation direction of the second wedge prism (6) is determined by the rotation direction of the second rotary motor (7).

6. The integrated laser welding cleaning device according to claim 1, characterized in that: The device also includes a protective mirror (8) for protecting the focusing system (4) from damage by welding spatter. The protective mirror (8) is located between the focusing system (4) and the workpiece (9) to be welded. The protective mirror (8) is a flat mirror.

7. The integrated laser welding cleaning device according to claim 6, characterized in that: The first collimation system (21) includes a first collimating lens (210) and a first collimating lens spherical aberration compensation lens (211). The second collimation system (22) includes a second collimating lens (220) and a second collimating lens spherical aberration compensation lens (221). The focusing system (4) includes a focusing lens (401) and a focusing lens spherical aberration compensation lens (402). The first collimating lens (210) and the second collimating lens (220) are biconvex lenses. The first collimating lens spherical aberration compensation lens (211) and the second collimating lens spherical aberration compensation lens (221) are plano-concave lenses. The first collimating lens spherical aberration compensation lens (211) is used to compensate for the spherical aberration introduced by the first collimating lens (210) to the collimated welding laser (111). The second collimating lens spherical aberration compensation lens (221) is used to compensate for the spherical aberration introduced by the second collimating lens (220) to the collimated cleaning laser (121).

8. The integrated laser welding cleaning device according to claim 7, characterized in that: The first collimating lens (210), the first collimating lens spherical aberration compensation lens (211), the second collimating lens (220), the second collimating lens spherical aberration compensation lens (221), the focusing lens (401), and the focusing lens spherical aberration compensation lens (402) are all coated with a laser-transmitting film system.

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