Laser printing equipment

Abstract

The utility model discloses laser printing equipment, which relates to the technical field of laser processing and comprises a laser, a lens group switching assembly and a focusing module and is used for outputting laser beams. The lens group switching assembly comprises a first driving part and at least two DOE lenses, the two DOE lenses are arranged in a spaced mode, and the first driving part is used for driving one DOE lens to move so that the DOE lenses can optimize and shape laser beams output by the laser device; the focusing module is used for focusing light spots of the laser beams shaped by the DOE lens to the surface of a workpiece to be machined; according to the technical scheme provided by the utility model, by switching different DOE lenses, various light spot shapes can be realized, different photovoltaic cell materials (such as crystalline silicon, perovskite and the like) and process steps can be adapted, the laser printing equipment provided by the scheme can be suitable for various materials and processes, and the universality and the flexibility of the equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of laser processing technology, and in particular to a laser printing device. Background Technology

[0002] In the photovoltaic field, laser printing technology utilizes a high-energy-density laser beam as an energy source. By focusing the laser beam onto a metal paste, physical or chemical changes occur in localized areas, thereby transferring the material from a carrier plate to the solar cell. Laser transfer printing can achieve high-precision grid layout, improve the contact performance between the grid lines and the solar cell, and is suitable for both traditional crystalline silicon photovoltaic cells and emerging perovskite photovoltaic cells.

[0003] In related technologies, different spot morphologies are required for different photovoltaic cell materials (such as crystalline silicon, perovskite, etc.) and process steps. Therefore, laser printing needs to switch the processing spot morphology according to actual needs, such as Gaussian spot, multi-spot spot, rectangular spot, line beam, etc. However, laser printing equipment usually requires manual switching of different spot morphologies. This operation is not only time-consuming and labor-intensive, but also prone to operational errors due to human factors. Moreover, the machine needs to be stopped when switching operations, which seriously affects production efficiency. Utility Model Content

[0004] The main purpose of this invention is to propose a laser printing device that aims to improve the production efficiency of the device.

[0005] To achieve the above objectives, the laser printing equipment proposed in this utility model includes:

[0006] A laser is used to output a laser beam.

[0007] A lens switching assembly, comprising a first drive and at least two DOE lenses, the two DOE lenses being spaced apart, the first drive being used to drive one of the DOE lenses to move, so that the DOE lens optimizes and shapes the laser beam output from the laser; and

[0008] The focusing module focuses the laser beam, after being shaped by the DOE lens, onto the surface of the workpiece to be processed.

[0009] In one embodiment, the lens group switching assembly includes a second drive member, a sliding rail and a slider, the sliding rail extending along the arrangement direction of the plurality of DOE lenses, the slider being connected to the first drive member, and the drive end of the second drive member being connected to the slider.

[0010] In one embodiment, the first driving member has a driving rod, and a clamping member is provided at the end of the driving rod away from the first driving member, and a buffer pad is provided at the clamping end of the clamping member.

[0011] In one embodiment, the lens switching assembly includes at least two first driving elements, each of which has a driving end connected to a DOE lens.

[0012] In one embodiment, the laser printing equipment includes a position detector located between the laser and the focusing module. The position detector is used to monitor the position status of the DOE lens in real time and is electrically connected to the first driving component.

[0013] In one embodiment, the focusing module includes a field lens for focusing the spot of the laser beam after passing through the DOE lens onto the surface of the workpiece to be processed.

[0014] In one embodiment, the focusing module further includes a galvanometer located between the DOE lens and the field lens, and is used to enable the laser beam shaped by the DOE lens to move rapidly on the surface of the workpiece to be processed.

[0015] In one embodiment, the laser printing apparatus includes a first reflector located between the laser and the lens switching assembly, and is used to guide the laser beam output by the laser to the DOE lens.

[0016] In one embodiment, the laser printing equipment includes a second reflector located between the lens group switching assembly and the focusing module, and is used to guide the laser beam after being shaped by the DOE lens to the focusing module.

[0017] In one embodiment, the laser printing apparatus further includes a collimating lens located between the laser and the first reflector, and used to collimate the diverging beam output by the laser into a parallel beam.

[0018] In this utility model, a laser is used to output a high-energy-density laser beam as the energy source for laser printing. The laser can be a solid-state laser, a fiber laser, or a CO2 laser, etc., and the appropriate laser type is selected according to different application requirements. The first driving component is used to drive the DOE lens to move and realize the switching of different spot shapes. The first driving component can be a motor, a cylinder, or other driving device. Each DOE lens is used to optimize and shape the laser beam output by the laser to form a spot of a specific shape, such as a Gaussian spot, a multi-spot spot, a rectangular spot, a line beam, etc. The first driving component is used to drive one of the DOE lenses to move into the optical path. When the spot shape needs to be switched, the first driving component moves the previous DOE lens out of the optical path and moves another DOE lens into the optical path to complete the switching. The focusing module focuses the laser beam shaped by the DOE lens onto the surface of the workpiece to be processed to form a uniform spot. Specifically, the laser outputs a laser beam, which first reaches the lens switching assembly. The first driving component moves a DOE (Device Array of Optical Components) lens into the optical path, shaping the laser beam into a specific spot shape. Each DOE lens shapes the laser beam into a different spot morphology according to its design. The laser beam, after being shaped by the DOE lens, enters the focusing module, which focuses the laser beam onto the workpiece surface, forming a uniform spot. Through the automated design of the lens switching assembly, different DOE lenses can be quickly switched, reducing manual operation time and improving production efficiency. Automated switching reduces downtime caused by changing DOE lenses, improving equipment utilization. DOE lenses can shape the laser beam into various spot shapes, such as Gaussian spots, multi-spot spots, rectangular spots, and line beams, meeting different processing requirements. By switching different DOE lenses, various spot morphologies can be achieved, adapting to different photovoltaic cell materials (such as crystalline silicon and perovskite) and process steps. The laser printing equipment proposed in this solution is applicable to various materials and processes, improving the equipment's versatility and flexibility. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an embodiment of the laser printing equipment provided by this utility model;

[0021] Figure 2 A schematic diagram of another embodiment of the laser printing equipment provided by this utility model;

[0022] Figure 3 This is a schematic diagram of yet another embodiment of the laser printing equipment provided by this utility model.

[0023] Explanation of icon numbers:

[0024] 100. Laser printing equipment; 1. Laser; 2. Lens switching assembly; 21. First drive unit; 22. DOE lens; 3. Focusing module; 31. Field lens; 32. Galvanometer; 4. First reflecting mirror; 5. Second reflecting mirror; 6. Slide rail.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] This utility model proposes a laser printing device 100.

[0030] Please see Figure 2 and Figure 3In one embodiment of this utility model, the laser printing equipment 100 includes a laser 1, a lens switching assembly 2, and a focusing module 3 for outputting a laser beam; the lens switching assembly 2 includes a first driving member 21 and at least two DOE lenses 22, the two DOE lenses 22 being spaced apart, the first driving member 21 being used to drive one of the DOE lenses 22 to move, so that the DOE lens 22 optimizes and shapes the laser beam output by the laser 1; the focusing module 3 focuses the spot of the laser beam after being shaped by the DOE lens 22 onto the surface of the workpiece to be processed.

[0031] In this utility model's technical solution, laser 1 is used to output a high-energy-density laser beam as the energy source for laser printing. Laser 1 can be a solid-state laser 1, a fiber laser 1, or a CO2 laser 1, etc., with the appropriate laser 1 type selected according to different application requirements. The first driving component 21 is used to drive the DOE lens 22 to move, achieving switching between different spot shapes. The first driving component 21 can be a motor, cylinder, or other driving device. Each DOE lens 22 is used to optimize and shape the laser beam output by laser 1, forming a spot of a specific shape, such as a Gaussian spot, a multi-spot spot, a rectangular spot, a line beam, etc. The first driving component 21 is used to drive one of the DOE lenses. When the DOE lens 22 moves into the optical path and a change in the spot shape is required, the first driving unit 21 moves the previous DOE lens 22 out of the optical path and moves another DOE lens 22 into the optical path to complete the switching. The focusing module 3 focuses the laser beam shaped by the DOE lens 22 onto the surface of the workpiece to be processed, forming a uniform spot. The first driving unit 21 is used to drive one of the DOE lenses 22 into the optical path. It can be that at least two DOE lenses 22 are connected through the driving end of the first driving unit 21, and the two DOE lenses 22 are spaced apart. Different DOE lenses 22 can be replaced by controlling the moving distance of the driving end of the first driving unit 21 (see [link]). Figure 2 Alternatively, multiple DOE lenses 22 can be arranged at intervals, and one of the DOE lenses 22 can be driven into the optical path by a movable first drive unit 21 to achieve replacement (see [link]). Figure 3This utility model does not limit the scope of the invention. Specifically, the laser 1 outputs a laser beam. The laser beam emitted by the laser 1 first reaches the lens switching assembly 2. The first driving unit 21 drives a DOE lens 22 to move into the optical path, shaping the laser beam into a spot of a specific shape. Each DOE lens 22 shapes the laser beam into a different spot shape according to the design. The laser beam after being shaped by the DOE lens 22 enters the focusing module 3, which focuses the laser beam onto the surface of the workpiece to form a uniform spot. The automated design of the lens switching component 2 allows for rapid switching between different DOE lenses 22, reducing manual operation time and improving production efficiency. Automated switching also reduces downtime caused by replacing DOE lenses 22, increasing equipment utilization. The DOE lenses 22 can shape the laser beam into various spot shapes, such as Gaussian spots, multi-spot spots, rectangular spots, and line beams, to meet different processing requirements. By switching between different DOE lenses 22, various spot morphologies can be achieved, adapting to different photovoltaic cell materials (such as crystalline silicon, perovskite, etc.) and process steps. The laser printing equipment 100 proposed in this solution is applicable to a variety of materials and processes, improving the equipment's versatility and flexibility.

[0032] Specifically, please refer to Figure 3In one embodiment of this utility model, the lens group switching assembly 2 includes a second driving member, a sliding rail 6, and a slider. The sliding rail 6 extends along the arrangement direction of the plurality of DOE lenses 22. The slider is connected to the first driving member 21, and the driving end of the second driving member is connected to the slider. The slider is located at a certain position on the sliding rail 6. The first driving member 21 drives one of the DOE lenses 22 into the optical path, and the laser beam is shaped by the DOE lens 22. When it is necessary to switch to another DOE lens 22, the first driving member 21 moves the DOE lens 22 out of the optical path. The second driving member is activated, and its driving end pushes the slider to move along the sliding rail 6. The movement of the slider drives the first driving member 21 to move. As the first driving member 21 moves, the other DOE lens 22 is moved into the optical path by the first driving member 21. The first driving member 21 fixes it in the optical path, completing the switching. The laser beam is shaped by the other DOE lens 22 to form a new spot shape. The focusing module 3 focuses the shaped laser beam onto the surface of the workpiece to be processed, and the processing continues. The sliding cooperation between the slide rail 6 and the slider ensures the precise switching position of the DOE lens 22, reducing the problem of inaccurate spot shape caused by position deviation. The driving method of the second drive unit (such as motor drive) can cooperate with the first drive unit 21 to complete the automated lens switching, reduce manual operation, and improve the operating efficiency and reliability of the equipment. The design of the slide rail 6 and the slider makes the structure of the lens switching assembly 2 compact, which is easy to integrate into the laser printing equipment 100, while saving space. By adjusting the stroke and control logic of the second drive unit, it can easily adapt to different numbers and arrangements of DOE lenses 22, enhancing the versatility and flexibility of the equipment.

[0033] In another embodiment, the lens group switching assembly 2 includes a turntable with at least two spaced-apart mounting holes. Each DOE lens 22 is disposed in one of the mounting holes, and the driving end of the first driving member 21 is connected to the turntable. When it is necessary to replace the DOE lens 22, the first driving member 21 drives the turntable to rotate, the previous DOE lens 22 moves out of the optical path, and the next DOE lens 22 is brought into the optical path, completing the switching. Using a turntable method results in higher switching efficiency.

[0034] Furthermore, in one embodiment of the present invention, the first driving member 21 has a driving rod, and a clamping member is provided at the end of the driving rod away from the first driving member 21, and a buffer pad is provided at the clamping end of the clamping member. The drive rod is part of the first drive component 21 and is used to transmit the power of the first drive component 21 to the clamping component, thereby realizing the movement and fixation of the DOE lens 22. One end of the drive rod is connected to the first drive component 21 and the other end is connected to the clamping component. Through the movement of the drive rod, the clamping component can drive the DOE lens 22 to move in the optical path. The clamping component is used to fix the DOE lens 22 and ensure its accurate and stable position in the optical path. The clamping end of the clamping component is provided with a buffer pad. The function of the buffer pad is to protect the DOE lens 22 and prevent damage to the lens during clamping. At the same time, it can also reduce the impact of vibration on the lens and ensure the stability of beam shaping. The main function of the buffer pad is to provide cushioning and protection, preventing the clamping component from applying excessive pressure to the DOE lens 22, thereby avoiding damage to the lens. The buffer pad is usually made of soft and elastic materials, such as rubber, silicone, or polyurethane foam. These materials can absorb some pressure during clamping and reduce the impact of vibration on the lens. The buffer pad is set in the clamping part of the clamping component and directly contacts the DOE lens 22.

[0035] To further improve switching efficiency, please refer to Figure 1 In another embodiment, the lens switching assembly 2 includes at least two first driving elements 21, each of which has a driving end connected to a DOE lens 22. One DOE lens 22 is moved into the optical path by the first driving element 21, and the laser beam is shaped by this lens. The other DOE lenses 22 are outside the optical path. When it is necessary to switch to another DOE lens 22, one first driving element 21 moves the DOE lens 22 out of the optical path, while the other first driving element 21 moves the DOE lens 22 into the optical path. This process can be completed simultaneously or sequentially by the control circuit, depending on the design and control logic of the device. After the switch is completed, the laser beam is shaped by the other DOE lens 22 to form a new spot shape. The focusing module 3 focuses the shaped laser beam onto the surface of the workpiece to be processed, and the processing continues. Each DOE lens 22 is controlled by an independent first drive unit 21, which allows for very fast switching, reducing switching time and improving equipment production efficiency. Since each lens can be controlled independently, the equipment can quickly switch to any lens according to actual needs, adapting to different processing requirements. Compared with the slide rail 6 and slider scheme, this design does not require a complex sliding mechanism, has a relatively simple structure, and reduces the wear and failure risk of mechanical parts.

[0036] To improve the reliability and accuracy of equipment operation, in one embodiment of this utility model, the laser printing equipment 100 includes a position detector located between the laser 1 and the focusing module 3. The position detector is used to monitor the position status of the DOE lens 22 in real time and is electrically connected to the first driving component 21. Located between the laser 1 and the focusing module 3, the position detector can directly monitor the position status of the DOE lens 22. Its main function is to monitor the position status of the DOE lens 22 in real time, ensuring that the DOE lens 22 accurately enters or leaves the optical path. The position detector can monitor the position of the DOE lens 22 in real time, providing immediate feedback, which helps ensure the accurate position of the DOE lens 22 in the optical path and avoids inaccurate spot shape due to positional deviation. The position detector is electrically connected to the first driving component 21, allowing it to feed back the monitored position information to the control system of the first driving component 21. The control system can adjust the actions of the first driving component 21 based on this information, ensuring more precise switching and positioning of the DOE lens 22. When switching to another DOE lens 22 is required, the first drive unit 21 moves the DOE lens 22 out of the optical path, and then moves the other DOE lens 22 into the optical path. The position detector monitors the position status of the DOE lens 22 in the optical path in real time and feeds the information back to the control system of the first drive unit 21. If the position detector detects a deviation in the position of the DOE lens 22, the control system will adjust the action of the first drive unit 21 until the DOE lens 22 is accurately in place, completing the switching. The real-time monitoring function of the position detector ensures that the position of the DOE lens 22 in the optical path is accurate, thereby improving the accuracy and consistency of the light spot morphology. Through real-time feedback and adjustment, the position detector can reduce processing errors caused by lens position deviations, improving the reliability and stability of the equipment. The electrical connection between the position detector and the first drive unit 21 enables automated control, reduces manual intervention, and improves the automation level of the equipment. The position detector can monitor the lens position in real time and quickly respond to position deviations, ensuring the speed and accuracy of the switching process.

[0037] Specifically, please refer to Figure 1 In one embodiment of this utility model, the focusing module 3 includes a field lens 31, which is used to focus the laser beam after passing through the DOE lens 22 onto the surface of the workpiece to be processed. The field lens 31 is a key component of the focusing module 3, and its main function is to focus the laser beam after being shaped by the DOE lens 22 onto the surface of the workpiece to be processed, forming a clear and uniform spot. By adjusting the convergence point of the beam, the field lens 31 ensures that the laser beam forms a high-energy-density focused spot on the workpiece surface. This focused spot can accurately act on the workpiece surface, achieving a highly efficient processing effect.

[0038] Further, please refer to Figure 1 In one embodiment of this utility model, the focusing module 3 further includes a galvanometer 32, which is located between the DOE lens 22 and the field lens 31, and is used to enable the laser beam, after being shaped by the DOE lens 22, to move rapidly on the surface of the workpiece to be processed. The galvanometer 32 being located between the DOE lens 22 and the field lens 31 means that after being shaped by the DOE lens 22, the laser beam first passes through the galvanometer 32 and then enters the field lens 31 for focusing. The main function of the galvanometer 32 is to enable the rapid movement of the laser beam on the surface of the workpiece. By controlling the movement of the galvanometer 32, the scanning path of the laser beam can be changed, thereby achieving rapid processing of the workpiece surface. The galvanometer 32 is typically composed of two or more mirrors, which can rotate or oscillate rapidly to change the direction of the laser beam. By precisely controlling the movement of the galvanometer 32, rapid scanning of the laser beam on the workpiece surface can be achieved. The movement of the galvanometer 32 can be controlled by a motor or other driving device, and its movement accuracy and speed directly affect the efficiency and quality of laser processing.

[0039] Please see Figure 1 In one embodiment of this utility model, the laser printing equipment 100 includes a first reflector 4, which is located between the laser 1 and the mirror switching assembly 2, and is used to guide the laser beam output by the laser 1 to the DOE lens 22. The location of the first reflector 4 between the laser 1 and the mirror switching assembly 2 means that after the laser beam is output from the laser 1, it first passes through the first reflector 4 and is then guided to the DOE lens 22. The main function of the first reflector 4 is to change the propagation direction of the laser beam, ensuring that the beam can accurately enter the DOE lens 22 in the mirror switching assembly 2. The first reflector 4 guides the laser beam from the laser 1 to the DOE lens 22 through reflection. This design optimizes the optical path layout, ensuring a reasonable and efficient propagation path for the beam within the equipment. The first reflector 4 can also be used to adjust the direction and position of the beam, ensuring that the beam can accurately enter subsequent optical components (such as the DOE lens 22 and the galvanometer 32). The first reflecting mirror 4 can change the propagation direction of the beam, making the optical path layout more compact and reasonable, saving equipment space. Through the reflection effect of the first reflecting mirror 4, the divergence of the beam during propagation can be reduced, improving the stability and consistency of the beam. The position and angle of the first reflecting mirror 4 can be adjusted as needed, enabling the equipment to adapt to different optical path designs and processing requirements. A reasonable optical path design can reduce the loss of the beam during propagation and improve the utilization rate of laser energy.

[0040] Please see Figure 1In one embodiment of this utility model, the laser printing equipment 100 includes a second reflector 5, which is located between the lens group switching component 2 and the focusing module 3, and is used to guide the laser beam shaped by the DOE lens 22 to the focusing module 3. The location of the second reflector 5 between the lens group switching component 2 and the focusing module 3 means that after the laser beam is shaped by the DOE lens 22, it first passes through the second reflector 5 and is then guided to the focusing module 3. The main function of the second reflector 5 is to change the propagation direction of the laser beam, ensuring that the shaped beam can accurately enter the focusing module 3. The second reflector 5 guides the laser beam shaped by the DOE lens 22 to the focusing module 3 through reflection. This design optimizes the optical path layout, ensuring a reasonable and efficient propagation path for the beam within the equipment. The second reflector 5 can also be used to adjust the direction and position of the beam, ensuring that the beam can accurately enter subsequent optical elements (such as the field lens 31 and the galvanometer 32). The second reflector 5 can change the propagation direction of the beam, making the optical path layout more compact and reasonable, saving equipment space. Through the reflection effect of the second reflector 5, the divergence of the beam during propagation can be reduced, and the stability and consistency of the beam can be improved. The position and angle of the second reflector 5 can be adjusted as needed, so that the equipment can adapt to different optical path designs and processing requirements. A reasonable optical path design can reduce the loss of the beam during propagation and improve the utilization rate of laser energy.

[0041] In one embodiment of this utility model, the laser printing equipment 100 further includes a collimating lens, which is located between the laser 1 and the first reflecting mirror 4, and is used to collimate the divergent beam output by the laser 1 into a parallel beam. The collimating lens being located between the laser 1 and the first reflecting mirror 4 means that after the laser beam is output from the laser 1, it first passes through the collimating lens and is then guided to the first reflecting mirror 4. The main function of the collimating lens is to collimate the divergent beam output by the laser 1 into a parallel beam, providing a high-quality beam for subsequent optical processing (such as reflection, shaping, and focusing). Through optical adjustment, the collimating lens converts the divergent beam output by the laser 1 into a parallel beam. This conversion can significantly reduce beam divergence during propagation, improve beam stability and consistency, and improve beam uniformity and directionality, ensuring that subsequent optical elements (such as the DOE lens 22, galvanometer 32, and field lens 31) can efficiently process the beam. Collimating lenses can significantly reduce beam divergence and improve beam uniformity and directionality, thereby improving the efficiency and quality of subsequent optical processing. Collimated parallel beams are more stable during propagation, reducing losses and non-uniformity caused by beam divergence and improving the overall performance of the equipment. The introduction of collimating lenses makes the optical path design more reasonable, ensuring that the beam can enter subsequent optical components efficiently and reducing energy loss in the optical path. High-quality parallel beams can ensure more accurate beam shaping and focusing in subsequent processes, thereby improving processing accuracy and consistency.

[0042] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A laser printing apparatus, characterized by, The laser printing device comprises: a laser for outputting a laser beam; a mirror group switching assembly, the mirror group switching assembly comprising a first driving member and at least two DOE lenses, the at least two DOE lenses being arranged at intervals, the first driving member being configured to drive one of the DOE lenses to move so as to optimize and shape the laser beam output by the laser; and a focusing module, the focusing module being configured to focus a light spot of the laser beam shaped by the DOE lens to a surface of a workpiece to be processed.

2. The laser printing apparatus of claim 1, wherein, The mirror group switching assembly comprises a second driving member, a slidingly fitted sliding rail and a sliding block, the sliding rail being arranged along an arrangement direction of the plurality of DOE lenses, the sliding block being connected with the first driving member, and a driving end of the second driving member being connected with the sliding block.

3. The laser printing apparatus of claim 2, wherein, The first driving member has a driving rod, an end of the driving rod away from the first driving member being provided with a clamping member, and a clamping end of the clamping member being provided with a buffer pad.

4. The laser printing apparatus of claim 1, wherein, The mirror group switching assembly comprises at least two first driving members, and a driving end of each of the first driving members is connected with one of the DOE lenses.

5. The laser printing apparatus according to any one of claims 1 to 4, wherein The laser printing device comprises a position detector, the position detector being located between the laser and the focusing module, the position detector being configured to monitor a position state of the DOE lens in real time and being electrically connected with the first driving member.

6. The laser printing apparatus according to any one of claims 1 to 4, wherein The focusing module comprises a field lens, the field lens being configured to focus the light spot of the laser beam after the DOE lens to the surface of the workpiece to be processed.

7. The laser printing apparatus of claim 6, wherein The focusing module further comprises a galvanometer mirror, the galvanometer mirror being located between the DOE lens and the field lens and being configured to realize rapid movement of the laser beam shaped by the DOE lens on the surface of the workpiece to be processed.

8. The laser printing apparatus of any one of claims 1 to 4, wherein, The laser printing device comprises a first reflecting mirror, the first reflecting mirror being located between the laser and the mirror group switching assembly and being configured to guide the laser beam output by the laser to the DOE lens.

9. The laser printing apparatus of claim 8, wherein, The laser printing device comprises a second reflecting mirror, the second reflecting mirror being located between the mirror group switching assembly and the focusing module and being configured to guide the laser beam shaped by the DOE lens to the focusing module.

10. The laser printing apparatus of claim 8, wherein, The laser printing device further comprises a collimating lens, the collimating lens being located between the laser and the first reflecting mirror and being configured to collimate a divergent light beam output by the laser into a parallel light beam.

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