Laser processing module and laser processing equipment

Abstract

The utility model discloses a laser processing module and laser processing equipment, the laser processing module comprises a laser and a zoom assembly, the laser is used for emitting a laser beam, the zoom assembly comprises a first lens element and a second lens element, the first lens element is arranged on the light emitting side of the laser and used for modulating the laser beam, and the second lens element is arranged on the light emitting side of the laser and used for modulating the laser beam; the first lens element has a first focal length, the first focal length is negative, the second lens element is arranged on the light emitting side of the first lens element and used for modulating laser beams output by the first lens element, the second lens element has a second focal length, and the low focal length is positive. At least one of the first lens element and the second lens element can be moved along the optical axis of the laser in order to adjust the distance between the first lens element and the second lens element, so that a longer processing distance can be achieved by using the lens elements with the same focal length. And the service life of the laser processing module is prevented from being affected by processing dust.

Description

Technical Field

[0001] This application relates to the field of laser processing, and in particular to a laser processing module and a laser processing equipment. Background Technology

[0002] In laser engraving or cutting processes, short focal length laser focusing modules are often used to achieve fine engraving. The short distance between the processing head and the processing surface makes it easy for processing dust to accumulate on the laser head, leading to a decrease in laser power or even burnout. Furthermore, the close proximity of the processing head to the processing surface and the air nozzle makes it easy for air blowing from the nozzle to blur the engraved pattern. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide a laser processing module and laser processing equipment, which can achieve processing with a longer working distance at a short focal length by changing the focal length between the processing head and the processing surface.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] This application discloses a laser processing module, which includes a laser and a zoom assembly. The laser emits a laser beam, and the zoom assembly includes a first lens element and a second lens element. The first lens element is disposed on the light-emitting side of the laser and is used to modulate the laser beam. The first lens element has a first focal length, which is negative. The second lens element is disposed on the light-emitting side of the first lens element and is used to modulate the laser beam output by the first lens element. The second lens element has a second focal length, which is positive. At least one of the first lens element and the second lens element is movable along the optical axis of the laser.

[0006] In some embodiments of this application, the first lens element includes one or more spaced concave lenses, and / or the second lens element includes one or more spaced convex lenses.

[0007] In some embodiments of this application, the first lens element includes a plano-concave lens or a biconcave lens; and / or, the second lens element includes a plano-convex lens or a biconvex lens.

[0008] In some embodiments of this application, the zoom assembly further includes a drive member connected to at least one of the first lens element and the second lens element, for driving the first lens element and / or the second lens element to move along the optical axis.

[0009] In some embodiments of this application, both the first lens element and the second lens element comprise lenses made of H-K9L material.

[0010] In some embodiments of this application, the emission angle of the laser beam output by the first lens element is any angle between 2° and 20°.

[0011] In some embodiments of this application, the laser processing module further includes an optical path shaping component, which is disposed between the laser and the first lens element and is used to shape the laser beam.

[0012] In some embodiments of this application, the optical path shaping assembly includes a fast-axis shaping lens and a slow-axis shaping lens spaced apart. The fast-axis shaping lens is located on the light-emitting side of the laser, and the slow-axis shaping lens is located between the fast-axis shaping lens and the first lens element. The first lens element is movable between the slow-axis shaping lens and the second lens element.

[0013] In some embodiments of this application, the laser processing module further includes a housing, in which the laser, the zoom component, and the optical path shaping component are disposed. The housing includes a first end and a second end disposed opposite to each other. The laser is disposed at the first end, and a protective mirror is provided at the second end. The laser beam output by the second lens element can pass through the protective mirror and form a light spot in the processing area.

[0014] This application also discloses a laser processing device, including a laser processing module and a frame as described in any of the preceding claims, wherein the laser processing module is disposed on the frame.

[0015] Beneficial effects:

[0016] The laser processing module provided in this application is used to transmit a laser beam input along the optical axis of a laser to a processing area. The laser processing module includes a laser and a zoom assembly. The zoom assembly includes a first lens element and a second lens element. The first lens element has a negative focal length and functions to diverge light, thus widening the laser beam. The second lens element has a positive focal length and can converge light, thus narrowing the laser beam. Through this combination, the shape and size of the laser beam can be precisely controlled, allowing the laser processing module to adjust the focusing and diverging states of the laser beam as needed. At least one of the first and second lens elements can move along the optical axis of the laser, making the distance between the first and second lens elements adjustable. This allows for adjustment of the focal length of the laser processing module and the distance between the laser processing module and the processing surface. This enables a longer processing distance at the same focal length, avoiding the problem of the laser processing module being contaminated by processing dust when too close to the processing surface, which could cause a decrease in laser processing module power or even burnout, thus extending the service life of the equipment.

[0017] The laser processing equipment provided in this application, including the laser processing module as described above, can achieve a longer working distance at the same focal length, avoids the impact of air jets into the laser processing module on the processing surface during processing, and improves processing accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a laser processing device provided in one embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the structure of a laser processing module provided in one embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the focal length of the zoom assembly at different distances for a first lens element and a second lens element provided in an embodiment of this application.

[0021] Figure 4 A schematic diagram of the focal length of the zoom assembly at different distances for a first lens element and a second lens element provided in another embodiment of this application.

[0022] Explanation of key component symbols: 1. Laser; 2. Zoom assembly; 21. First lens element; 22. Second lens element; 3. Optical path shaping assembly; 31. Fast axis shaping lens; 32. Slow axis shaping lens; 4. Protective mirror; 5. Laser beam; 100. Laser processing module; 200. Track; 300. Frame. Detailed Implementation

[0023] This application provides a laser processing module and a laser processing equipment. To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following detailed description is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0024] In the description of this application, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this application. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Figure 1 A schematic diagram of the laser processing equipment provided in this application.

[0027] like Figure 1 As shown, this application provides a laser processing device, specifically a laser engraving machine, which precisely processes organic materials, metal materials, glass materials, etc., by controlling parameters such as the size, shape, and energy of the laser beam. The laser processing device includes a frame 300, a laser processing module 100, a track 200, and a drive mechanism (not shown in the figure). The laser processing module 100 transmits, focuses, and adjusts the laser beam 5 to ensure that the laser beam 5 input along the optical axis of the laser processing module 100 is accurately transmitted to the processing area, thereby achieving high-precision processing. The track 200 is mounted on the frame 300, and the laser processing module 100 is slidably connected to the track 200. The drive mechanism is connected to the laser processing module 100 and is used to drive the laser processing module 100 to move along the track 200 to process different parts of the workpiece.

[0028] The laser processing equipment also includes an air nozzle (not shown in the figure), which is connected to the outside of the laser processing module 100. The air nozzle can blow air into the laser processing module 100 to keep the laser processing module 100 clean, thereby ensuring the accuracy of laser processing.

[0029] In some embodiments, the laser processing module 100 generates high heat during operation. To prevent thermal damage to the laser processing module 100, the laser processing equipment also includes a heat dissipation component (not shown in the figure), which is connected to the laser processing module 100 to cool the laser processing module 100.

[0030] Figure 2 This is a schematic diagram of the structure of the laser processing module provided in this application. Figure 3 This is a schematic diagram of the focal length of the zoom assembly at different distances for a first lens element and a second lens element provided in an embodiment of this application.

[0031] Figure 4 A schematic diagram of the focal length of the zoom assembly at different distances for a first lens element and a second lens element provided in another embodiment of this application.

[0032] Please see Figures 2 to 3 Specifically, the laser processing module 100 includes a laser 1 and a zoom assembly 2. The laser 1 is used to emit a laser beam 5; the zoom assembly 2 includes a first lens element 21 and a second lens element 22. The first lens element 21 is disposed on the light-emitting side of the laser 1 and is used to modulate the laser beam 5. The first lens element 21 has a first focal length, which is negative. The second lens element 22 is disposed on the light-emitting side of the first lens element 21 and is used to modulate the laser beam 5 output by the first lens element 21. The second lens element 22 has a second focal length, which is positive. At least one of the first lens element 21 and the second lens element 22 can move along the optical axis of the laser 1 so that the distance between the first lens element 21 and the second lens element 22 is adjustable.

[0033] The laser processing module 100 described above adopts a zoom component 2 structure. The zoom component 2 includes a first lens element 21 and a second lens element 22. The first lens element 21 can move along the optical axis of the laser processing module 100, and the second lens element 22 is set to a fixed structure. By adjusting the position of the first lens element 21, that is, changing the distance between the first lens element 21 and the second lens element 22, the focal position of the laser beam 5 can be changed, so as to achieve precise control of the working distance of the laser beam 5 and ensure that the laser beam 5 can be accurately transmitted to the processing area.

[0034] In other embodiments, the first lens element 21 may be configured as a fixed structure, and the second lens element 22 may be movable along the optical axis to adjust the distance between the first lens element 21 and the second lens element 22.

[0035] In other embodiments, the first lens element 21 and the second lens element 22 may also be configured to be movable along the optical axis, thereby changing the distance between the first lens element 21 and the second lens element 22 to adjust the focusing position of the laser beam 5.

[0036] Specifically, the laser beam 5 emitted by laser 1 is first modulated by a first lens element 21. The first lens element 21 has a negative focal length, causing the laser beam 5 to diffuse after passing through it, making the laser beam 5 wider. The diffused laser beam 5 then enters a second lens element 22, which has a positive focal length and can converge the light, making the laser beam 5 thinner and allowing for focusing. By using the combination of the first lens element 21 and the second lens element 22, the shape and size of the laser beam 5 can be precisely controlled, allowing the laser processing module 100 to adjust the focusing and diverging states of the laser beam 5 as needed, thereby meeting different application requirements.

[0037] Furthermore, by changing the distance between the first lens element 21 and the second lens element 22, a longer processing distance can be achieved even when using lenses with the same focal length. This avoids the laser processing module 100 from being too close to the processing surface and getting contaminated with processing dust, which could lead to a decrease in power or even burnout, thus extending the service life of the laser processing module 100.

[0038] During laser engraving, to remove dust and smoke generated during the process, maintain a clean processing surface, and improve the engraving effect, an air nozzle is typically used to blow air onto the laser processing module 100. However, when the laser processing module 100 is too close to the processing surface, excessive airflow from the air nozzle can cause dust and smoke to fly erratically on the processing surface, resulting in a blurred engraved pattern. Therefore, by using the first lens element 21 and the second lens element 22 to achieve zooming of the laser processing module 100, the processing distance can be increased, eliminating the need to place the laser processing module 100 too close to the processing surface and preventing dust accumulation on the laser processing module 100 from affecting processing accuracy.

[0039] Specifically, the relationship between the combined focal length of the first lens element 21 and the second lens element 22 and the first focal length and the second focal length is shown in the following equation (1):

[0040]

[0041] Where f′ is the combined focal length of the first lens element and the second lens element, f1′ is the first focal length, f2′ is the second focal length, and d is the distance between the first lens element 21 and the second lens element 22.

[0042] like Figure 3 and Figure 4 As shown, Figure 3 In Figures a and b, a laser beam 5 of the same size and quality is used. In Figure a, the distance between the first lens element 21 and the second lens element 22 is smaller than that in Figure b. Therefore, the focal length of the zoom assembly 2 in Figure a is greater than that in Figure b. Figure 4 In diagrams c, d, and e, the distance between the first lens element 21 and the second lens element 22 gradually increases, thus the focal length of the zoom assembly 2 gradually decreases.

[0043] That is, as the distance between the first lens element 21 and the second lens element 22 increases, the focal length of the zoom assembly 2 in the laser processing module 100 will decrease, making it suitable for different processing distances.

[0044] Furthermore, the relationship between the size of the focused spot on the processing surface and the zoom component 2 is shown in equation (2):

[0045]

[0046] Where C is the size of the focused spot, m 2 Let λ be the mass of the laser beam 5, λ be the wavelength of the laser, f be the focal length of the zoom component 2, and d be the diameter of the input laser beam 5.

[0047] According to equation (2), the size of the light spot focused on the processing surface by the laser processing module 100 is proportional to the focal length of the zoom component 2. That is, the larger the focal length of the zoom component 2, the larger the focused light spot.

[0048] The size of the focused spot directly affects the processing accuracy of the laser beam 5 on the surface of the workpiece. The smaller the focused spot of the laser processing module 100, the higher the processing accuracy. By adjusting the distance between the first lens element 21 and the second lens element 22, the focal length of the zoom component 2 can be changed, thereby adjusting the size of the focused spot of the laser processing module 100 and achieving a more refined processing effect.

[0049] Laser 1 can be one of a carbon dioxide laser 1, a fiber laser 1, a semiconductor laser 1, and a diode laser 1, etc. That is, the embodiments of this application can be applied to semiconductor lasers, carbon dioxide lasers, etc.

[0050] In some embodiments, the first lens element 21 includes a concave lens, and the second lens element 22 includes a convex lens. The concave lens and the convex lens are spaced apart, and the focal points of the concave lens and the convex lens are sequentially distributed along the optical axis of the laser processing module 100.

[0051] In other embodiments, the first lens element 21 includes a plurality of concave lenses, and the second lens element 22 includes a convex lens. The plurality of concave lenses are spaced apart on the light-emitting side of the laser 1, and the focal points of the plurality of concave lenses and the focal points of the convex lens are sequentially distributed along the optical axis of the laser processing module 100.

[0052] In other embodiments, the first lens element 21 includes a concave lens, and the second lens element 22 includes a plurality of convex lenses. The plurality of convex lenses are spaced apart on the light-emitting side of the first lens element 21, and the focal points of the concave lens and the plurality of convex lenses are sequentially distributed along the optical axis of the laser processing module 100.

[0053] In other embodiments, the first lens element 21 includes a plurality of concave lenses, and the second lens element 22 includes a plurality of convex lenses. The plurality of concave lenses are sequentially spaced between the laser 1 and the second lens element 22, and the focal points of the plurality of concave lenses are sequentially distributed along the optical axis. The plurality of convex lenses are sequentially spaced on the light-emitting side of the first lens element 21, and the focal points of the plurality of convex lenses are sequentially distributed along the optical axis.

[0054] The first lens element 21 can be composed of one or more spaced concave lenses, and the second lens element 22 can be composed of one or more spaced convex lenses. The focal points of the concave and convex lenses are distributed sequentially along the optical axis, so that in practical applications, the focusing effect and transmission path of the laser beam 5 can be flexibly adjusted according to different processing requirements to achieve the best processing effect.

[0055] Specifically, the first lens element 21 can be a plano-concave lens; or, the first lens element 21 can be a biconcave lens. Both design options can achieve specific optical performance. The plano-concave lens design can correct aberrations to a certain extent while maintaining a thinner lens thickness, which helps to reduce overall weight and cost. The biconcave lens, on the other hand, may provide superior optical performance at certain focal lengths and magnifications, especially when stronger converging power is required. In practical applications, the type of the first lens element 21 can be selected according to specific application requirements.

[0056] The second lens element 22 can be a plano-convex lens; or, the second lens element 22 can be a biconvex lens.

[0057] Both design choices contribute to optimizing the performance of the optical system. A plano-convex lens can correct aberrations to some extent while maintaining a compact structure, making it suitable for applications with size constraints. A biconvex lens, on the other hand, provides stronger converging power, helping to improve the system's image quality, and is particularly suitable for scenarios requiring high resolution. In practical applications, the type of the second lens element 22 can be flexibly selected according to specific application requirements.

[0058] In some embodiments, the first lens element 21 and the second lens element 22 are respectively lenses made of H-K9L (Schott BK7, a borosilicate glass). H-K9L material has good light transmittance and stable physicochemical properties, which can effectively reduce light scattering and absorption inside the lens, ensuring high image clarity and contrast. Furthermore, H-K9L material also has excellent processing performance, meeting the requirements of precision manufacturing, thereby further improving the optical quality of the lens.

[0059] Furthermore, the emission angle of the laser beam 5 after passing through the first lens element 21 is 2° to 20°. For example, the emission angle of the laser beam 5 after passing through the first lens element 21 can be 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, or 20°, or any value within the above range. This angle range ensures that the laser beam 5 can cover a wide working area while maintaining sufficient accuracy and focusing performance. By adjusting the parameters of the first lens element 21, the emission angle of the laser beam 5 can be flexibly controlled to meet the needs of different processing distances. This adjustability gives the laser processing module 100 high flexibility and adaptability, enabling it to be used for longer processing distances. It effectively solves the problems caused by dust contamination and air blowing during laser processing, significantly improving processing accuracy and efficiency, and reducing the risk of laser head power loss and burnout.

[0060] To enable automatic adjustment of the first lens element 21 within the variable lens distance and automatic adjustment of the focal length of the laser processing module 100, the zoom assembly 2 also includes a drive unit (not shown in the figure). The drive unit is connected to the first lens element 21 and / or the second lens element 22 and is used to drive the first lens element 21 and / or the second lens element 22 to move along the optical axis.

[0061] That is, the driving member can be connected to the first lens element 21 and drive the first lens element 21 to move closer to or away from the second lens element 22; or the driving member can be connected to the second lens element 22 and drive the second lens element 22 to move closer to or away from the first lens element 21; in other embodiments, the driving member is connected to both the first lens element 21 and the second lens element 22, and they can move along the optical axis of the laser 1 under the drive of the driving member.

[0062] The drive unit can precisely control the position of the first lens element 21 and the second lens element 22 by means of mechanical or electric means, thereby achieving zoom.

[0063] In some embodiments, the driving element may be a stepper motor, which precisely adjusts the positions of the first lens element 21 and the second lens element 22 by controlling the rotation angle of the motor.

[0064] In another embodiment, the drive element may be a linear actuator that adjusts the position of the first lens element 21 and the second lens element 22 by controlling its extension and retraction.

[0065] In another embodiment, the drive can also utilize a hydraulic or pneumatic system to move the first lens element 21 and the second lens element 22.

[0066] In another embodiment, the driving element may also adopt an excitation driving method, which generates driving force through electromagnetic effect to realize the movement of the first lens element 21 and the second lens element 22.

[0067] By using a drive unit, the zoom assembly 2 can change the focal length by adjusting the position of the first lens element 21 or the second lens element 22 without moving the entire laser processing module 100. This not only improves the flexibility and efficiency of the laser processing module 100, but also avoids contamination of the laser processing module 100 by processing dust and extends the service life of the laser processing module 100.

[0068] like Figure 2 As shown, in some embodiments, the laser processing module 100 further includes an optical path shaping component 3, which is disposed on the light-emitting side of the laser 1 and spaced between the laser 1 and the first lens element 21, for shaping the laser beam 5.

[0069] In the above, by setting the optical path shaping component 3 between the laser 1 and the first lens element 21, the shape and size of the laser beam 5 can be better adjusted, thereby improving the uniformity and stability of the laser processing module 100.

[0070] The optical path shaping assembly 3 includes a fast-axis shaping lens 31 and a slow-axis shaping lens 32 spaced apart. The fast-axis shaping lens 31 is located on the light-emitting side of the laser 1, and the slow-axis shaping lens 32 is located between the fast-axis shaping lens 31 and the first lens element 21. The first lens element 21 can move between the slow-axis shaping lens 32 and the second lens element 22. The fast-axis shaping lens 31 and the slow-axis shaping lens 32 in the optical path shaping assembly 3 are spaced apart. The fast-axis shaping lens 31, located on the light-emitting side of the laser 1, is mainly used for initial shaping of the laser beam 5. The slow-axis shaping lens 32, located between the fast-axis shaping lens 31 and the first lens element 21, further shapes the laser beam 5 and forms a variable lens distance between the fast-axis shaping lens 31 and the second lens element 22. By adjusting the lens spacing and shaping the beam, the transmission and focusing effect of the laser beam 5 is optimized, effectively reducing the impact of processing dust on the laser processing module 100, thereby improving the progress and safety of the laser engraving or cutting process.

[0071] Furthermore, the fast-axis shaping lens 31 can be a plano-concave lens or a biconcave lens, and the slow-axis shaping lens 32 can be a plano-convex lens or a biconvex lens. By combining different types of lenses, fine adjustments to the laser beam 5 can be achieved. Specifically, the fast-axis shaping lens 31 is mainly used to adjust the fast-axis direction of the laser beam 5, making it more concentrated in that direction; the slow-axis shaping lens 32 is mainly used to adjust the slow-axis direction of the laser beam 5, making it more uniform in that direction. Through the cooperation of the fast-axis shaping lens 31 and the slow-axis shaping lens 32, dual optimization of the shape and size of the laser beam 5 can be achieved, improving the accuracy and safety of laser processing.

[0072] In some embodiments, the laser processing module 100 further includes a housing (not shown in the figure), in which the laser 1, zoom assembly 2 and optical path shaping assembly 3 are disposed. The housing includes a first end and a second end disposed opposite to each other. The laser 1 is disposed at the first end, and a protective mirror 4 is provided at the second end. The laser beam 5 through the second lens element 22 can pass through the protective mirror 4 and form a focused spot in the processing area.

[0073] By installing a housing within the laser processing module 100, the laser 1, zoom component 2, and optical path shaping component 3 are housed within the housing, effectively protecting these components from the influence of the external environment. A protective mirror 4 is provided at the second end of the housing, allowing the laser beam 5 to pass smoothly and form a spot in the processing area. This ensures both the stability and lifespan of the components, as well as the transmission and focusing effect of the laser beam 5.

[0074] Furthermore, the outer shell can be made of high-strength materials, such as stainless steel, aluminum, copper, or ceramics and silicone potting materials, which can effectively resist external mechanical impacts and dust contamination. Meanwhile, the protective mirror 4 can be made of materials with good light transmittance and high temperature resistance, such as quartz glass, to ensure efficient transmission and focusing of the laser beam 5. By setting the outer shell and protective mirror 4 in the laser processing module 100, not only can the laser 1, zoom component 2, and optical path shaping component 3 inside the outer shell be effectively protected, extending their service life, but the transmission of the laser beam 5 can also be ensured to be unaffected by external environmental interference, thereby improving processing accuracy and efficiency, and better solving the problems of contamination and damage to the laser processing module 100 encountered during laser engraving and cutting.

[0075] In summary, this application, by placing a zoom component between the laser and the output end (protective mirror) of the laser processing module, adjusts the focal length of the zoom component by changing the distance between the first and second lens elements, thereby achieving different working distances. This avoids the problem of the laser processing module being too close to the processing surface and being contaminated by processing dust, causing power reduction or even burnout, thus improving the service life of the processing module, as well as the accuracy and safety of laser processing. Furthermore, it avoids the problem of blurred patterns caused by air blowing during engraving. By placing an optical path shaping component between the laser and the zoom component, the shape and size of the laser beam are optimized, improving the stability and accuracy of laser processing.

[0076] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and concept of this application, and all such substitutions or changes should fall within the protection scope of the appended claims.

Claims

1. A laser processing module, characterized in that, The laser processing module includes: A laser is used to emit a laser beam; The zoom assembly includes a first lens element and a second lens element. The first lens element is disposed on the light-emitting side of the laser and is used to modulate the laser beam. The first lens element has a first focal length, which is negative. The second lens element is disposed on the light-emitting side of the first lens element and is used to modulate the laser beam output by the first lens element. The second lens element has a second focal length, which is positive. At least one of the first lens element and the second lens element is movable along the optical axis of the laser so that the distance between the first lens element and the second lens element is adjustable.

2. The laser processing module according to claim 1, characterized in that, The first lens element includes one or more spaced concave lenses, and / or, The second lens element includes one or more convex lenses spaced apart.

3. The laser processing module according to claim 1, characterized in that, The first lens element includes a plano-concave lens or a biconcave lens; and / or, the second lens element includes a plano-convex lens or a biconvex lens.

4. The laser processing module according to claim 1, characterized in that, The zoom assembly further includes a drive unit connected to at least one of the first lens element and the second lens element, for driving the first lens element and / or the second lens element to move along the optical axis.

5. The laser processing module according to any one of claims 1 to 4, characterized in that, Both the first lens element and the second lens element comprise lenses made of H-K9L material.

6. The laser processing module according to any one of claims 1 to 4, characterized in that, The laser beam output by the first lens element has an emission angle of any angle between 2° and 20°.

7. The laser processing module according to any one of claims 1 to 4, characterized in that, The laser processing module further includes an optical path shaping component, which is located between the laser and the first lens element and is used to shape the laser beam.

8. The laser processing module according to claim 7, characterized in that, The optical path shaping assembly includes a fast-axis shaping lens and a slow-axis shaping lens spaced apart. The fast-axis shaping lens is located on the light-emitting side of the laser, and the slow-axis shaping lens is located between the fast-axis shaping lens and the first lens element. The first lens element is movable between the slow-axis shaping lens and the second lens element.

9. The laser processing module according to claim 8, characterized in that, The laser processing module also includes a housing, in which the laser, the zoom component, and the optical path shaping component are disposed. The housing includes a first end and a second end disposed opposite to each other. The laser is disposed at the first end, and a protective mirror is provided at the second end. The laser beam output by the second lens element can pass through the protective mirror and form a light spot in the processing area.

10. A laser processing device, characterized in that, Including the claims 1 to 9 A laser processing module and a frame, wherein the laser processing module is mounted on the frame.

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