Laser lens and laser cutting device

Abstract

The present disclosure provides a laser lens and a laser cutting device, wherein the laser lens is used for modulating laser emitted by a laser. The laser lens comprises an optical lens group, a plurality of mounting modules and an adjusting mechanism. The optical lens group comprises a beam expanding unit, a modulating unit and a focusing unit arranged along the propagation direction of the laser, each unit comprising a plurality of lenses for modulating the laser. The plurality of mounting modules are arranged along the propagation direction of the laser for mounting the lenses of the plurality of units of the optical lens group, and each mounting module is provided with at least one lens. The adjusting mechanism is connected between two adjacent mounting modules for adjusting the relative positions of the two adjacent mounting modules. Through the adjusting mechanism, the relative positions of the plurality of lenses can be adjusted more conveniently, the focal depth of the laser lens is adjusted, the processing of workpieces with different thicknesses is more convenient, and the use convenience and production efficiency are improved.

Description

Technical Field

[0001] This disclosure relates to the technical field of beam shaping, specifically to a laser lens and laser cutting equipment. Background Technology

[0002] Bessel laser lenses are commonly used equipment in the field of precision machining, and are widely used in high-precision scenarios such as cutting brittle materials, drilling multilayer polymers, and minimally invasive surgery on biological tissues.

[0003] Traditional Bessel laser lenses employ a rigidly packaged optical lens structure, where the lenses are fixed, meaning the depth of focus is predetermined. Consequently, when processing workpieces of varying thicknesses, the laser lens must be replaced, resulting in low production efficiency. Utility Model Content

[0004] In view of this, the present disclosure aims to provide a laser lens and laser cutting equipment to solve the problems in the prior art where laser lenses are difficult to adapt to workpieces of different thicknesses and are cumbersome to use and operate, resulting in low production efficiency.

[0005] On one hand, this disclosure provides a laser lens for modulating laser light emitted by a laser. The laser lens includes an optical lens assembly, an adjustment mechanism, and multiple mounting modules. The optical lens assembly includes a beam expander, a modulation unit, and a focusing unit, all arranged along the laser propagation direction. Each unit includes several lenses, which modulate the laser light. Multiple mounting modules are arranged along the laser propagation direction and are used to mount the lenses of the multiple units; each mounting module has at least one lens. The adjustment mechanism is connected between two adjacent mounting modules and is used to adjust the relative positions of the two adjacent mounting modules.

[0006] In the above technical solution, an installation module is set as the carrier of the lenses of the optical lens group, and the relative position of the installation module is adjusted by an adjustment mechanism to adjust the spacing of the lenses. The laser lens is used to modulate the laser to form the focal depth required for the processing of the corresponding workpiece, and the focusing position of the laser is adjusted. When the workpiece being processed changes, such as the thickness of the workpiece, the position of the installation module is adjusted by the adjustment mechanism to change the modulation effect of the laser by the lenses of the optical lens group, so that the relevant parameters of the modulated laser are adapted to the changed workpiece. In this way, when using the laser lens to process a workpiece, if the thickness of the workpiece being processed changes, the relative position of the lenses can be directly adjusted to change the relevant parameters of the laser modulation, so that the modulated laser can better process the workpiece without disassembling and replacing the laser lens, which greatly reduces the complexity of operation, reduces the occupation of production time, and improves the efficiency of processing and production.

[0007] In one specific implementation, the beam expanding unit includes a diffusion optical element and a focusing optical element. The laser beam enters the diffusion optical element and is diffused. The diffused laser beam then enters the focusing optical element and is focused. The diffused laser beam is then expanded by the focusing optical element, and the diameter of the expanded laser beam is larger than the diameter of the original laser beam.

[0008] In one specific implementation, the modulation unit has a first surface and a second surface, which are arranged opposite to each other along the propagation direction of the laser. The first surface is perpendicular to the propagation direction of the laser, and the expanded laser beam enters the modulation unit through the first surface. The second surface is a conical surface, and the axis of the conical surface coincides with the axis of the expanded laser beam. The expanded laser beam propagates through the second surface and is modulated by the second surface to form a Bessel beam.

[0009] In one specific implementation, when the beam expander unit includes a diffusion optics element and a focusing optics element, the diffusion optics element, the focusing optics element, and the modulation unit are each connected to a separate mounting module.

[0010] In one specific implementation, when the beam expander unit includes a diffusion optics element and a focusing optics element, the diffusion optics element is connected to a separate mounting module. The focusing optics element and the modulation unit are connected to another identical mounting module.

[0011] In one specific implementation, the focusing unit includes at least a third convex lens and a fourth convex lens. The fourth convex lens is located on the side of the third convex lens along the propagation direction of the laser. The fourth convex lens is the output end of the focusing unit. The optical lens assembly also includes a correction unit for correcting laser aberrations. The correction unit is located on the side of the fourth convex lens facing the third convex lens and is disposed adjacent to the fourth convex lens.

[0012] In one specific implementation, the mounting module is annular and includes a mounting portion and a connecting portion. The lens is connected to the inner peripheral sidewall of the mounting portion. The mounting portion is threadedly engaged with the connecting portion of the adjacent mounting module. An adjustment mechanism is connected between the threaded connecting portion and the mounting portion to drive the mounting portion to rotate relative to the connecting portion, thereby causing the two mounting modules to slide relative to each other.

[0013] In one specific implementation, the adjusting mechanism includes worm gear teeth, a worm, and a power component. The worm gear teeth are mounted on the mounting portion. The worm is rotatably connected to the connecting portion and engages with the worm gear teeth on the corresponding mounting portion to form a worm gear transmission structure. The power component is connected to the connecting portion and is driven by the worm to rotate the worm relative to the connecting portion.

[0014] In one specific implementation scheme, a control system is also included, comprising an information acquisition module and a controller. The information acquisition module is used to acquire the thickness of the workpiece to be processed. The controller is signal-connected to the information acquisition module, receives the thickness data from the information acquisition module, and determines the spacing between the lenses based on the thickness data. The controller is also signal-connected to the adjustment mechanism, sending action commands to the adjustment mechanism to adjust the position of the mounting module and simultaneously adjust the spacing between the lenses.

[0015] In one specific implementation, the laser lens also includes a feedback module connected to the controller. The feedback module detects the distance between adjacent mounting modules, obtains a distance detection value, and transmits this value to the controller. The controller further controls the adjustment mechanism to lock the position of the mounting modules when the distance detection value matches a set value.

[0016] On the other hand, this disclosure also provides a laser cutting apparatus, including a laser and a laser lens as described in any of the above. The laser lens is used to shape and focus the laser beam emitted by the laser. Attached Figure Description

[0017] Figure 1 The diagram shown is a structural schematic of the optical lens assembly provided in an embodiment of this disclosure.

[0018] Figure 2 The diagram shown is a schematic of the installation module and adjustment mechanism provided in an embodiment of this disclosure.

[0019] Figure 3 The image shown is an embodiment provided by this disclosure. Figure 2 An enlarged schematic diagram of part A in the middle.

[0020] Figure 4 This is a schematic diagram of a control system provided in an embodiment of the present disclosure.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Optical lens group; 11. Beam expander unit; 111. Diffusing optical element; 1111. First convex lens; 1112. Concave lens; 112. Focusing optical element; 12. Modulation unit; 13. Focusing unit; 131. Third convex lens; 132. Fourth convex lens; 14. Correction unit.

[0023] 2. Installation module; 21. Installation part; 22. Connection part;

[0024] 3. Adjustment mechanism; 31. Worm gear; 32. Worm wheel teeth; 33. Power component;

[0025] 4. Control system; 41. Information acquisition module; 42. Controller; 43. Feedback module. Detailed Implementation

[0026] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure are within the scope of protection of this disclosure.

[0027] To facilitate understanding of the laser lens provided in this disclosure, a brief description of its application scenarios and related structure is provided. Laser lenses are commonly used devices in the field of precision machining, widely applied in high-precision scenarios such as cutting brittle materials, precision drilling of multi-layer polymers, and minimally invasive surgery on biological tissues; they convert the Gaussian beam emitted by a laser into a Bessel beam, making it more suitable for processing.

[0028] The main component of a laser lens is its optical lens assembly, which consists of multiple interlocking lenses. The laser beam passes through these lenses, allowing the properties and parameters of the laser to be modulated, making it more suitable for processing the workpiece. Traditional Bessel laser lenses employ a rigidly packaged optical lens assembly structure, with multiple lenses fixedly connected within the lens's encapsulation.

[0029] While the above connection method ensures the relative position stability of multiple lenses, it also results in a constant laser processing effect across all lenses, meaning the focal depth parameter of the laser lens is fixed. However, for workpieces of different thicknesses, lasers with corresponding focal depth parameters are required to achieve optimal processing results; otherwise, the processing quality will be poor. Therefore, in actual processing, processing workpieces of different thicknesses necessitates changing laser lenses with corresponding focal depth parameters, forcing frequent production line downtime for lens module replacements, wasting time and reducing production efficiency. This problem is particularly severe in multi-specification mixed-line production scenarios for 3C products.

[0030] To address the aforementioned technical problems, this disclosure provides a laser lens and a laser cutting device. The relative positions of multiple lenses are adjusted as needed to adaptively adjust the focal depth parameters of the lens, enabling the lens to modulate the laser to form the required focal depth, thus adapting to the processing of workpieces of different thicknesses. Compared to downtime for lens module replacement, this significantly reduces wasted time and improves production efficiency.

[0031] The technical solutions of the embodiments of this disclosure are described in detail below with reference to the accompanying drawings. The technical features involved in the different embodiments of this disclosure described below can be combined with each other as long as they do not conflict with each other.

[0032] The laser cutting equipment disclosed herein includes a laser and a laser lens, the laser lens being used to shape and focus the laser beam emitted by the laser. The specific structure of the laser lens is as follows.

[0033] refer to Figure 1 and Figure 2 , Figure 1 The optical lens assembly and laser transmission path of the laser lens are shown. Figure 2 The overall structure of the laser lens is shown. The laser lens is used to modulate the laser emitted by the laser and includes an optical lens group 1, a mounting module 2, and an adjustment mechanism 3. The optical lens group 1 includes a beam expander unit 11, a modulation unit 12, and a focusing unit 13 arranged along the propagation direction of the laser. Each unit includes several lenses for modulating the laser.

[0034] Multiple mounting modules 2 are provided, arranged and connected sequentially along the laser propagation direction to form the encapsulation structure of the laser lens. The multiple mounting modules 2 are configured to mount multiple lenses of multiple units of the optical lens group 1. For example, one mounting module 2 can mount one lens, or multiple lenses can be mounted on one mounting module 2. The multiple lenses can be two, three, four or more.

[0035] Multiple adjustment mechanisms 3 are provided, and any one adjustment mechanism 3 is connected between two adjacent installation modules 2 to adjust the relative position of the two connected installation modules. For example, if one adjustment mechanism 3 is provided between each pair of adjacent installation modules 2, then the total number of adjustment mechanisms 3 is one less than the number of installation modules 2. Of course, in some embodiments, two, three or more adjustment mechanisms can also be provided between two adjacent installation modules 2, and multiple adjustment mechanisms 3 cooperate to adjust the relative position of the two installation modules 2.

[0036] The propagation direction of the laser refers to the direction in which the laser axis extends. In this embodiment, the propagation direction is unidirectional. Correspondingly, in other embodiments, the propagation direction of the laser can be adjusted by setting components such as a reflector.

[0037] In the above "each unit includes several pairs of lenses for modulating the laser", each unit refers to any one of the following: beam expanding unit 11, modulation unit 12, and focusing unit 13; in some other embodiments, when the optical lens group 1 also includes other units, each of the above units may also be any one of the other units.

[0038] Furthermore, it should be noted that in some embodiments, the number of adjustment mechanisms 3 may be one, and correspondingly, the number of mounting modules 2 may be two, three, or more; one adjustment mechanism 3 is disposed between two of the mounting modules 2 to adjust the relative position of the lenses mounted on the two mounting modules 2. For the sake of consistency, this disclosure embodiment only uses the example where both the number of mounting modules 2 and the number of adjustment mechanisms 3 are multiple.

[0039] This embodiment of the present disclosure sets up a laser lens including multiple mounting modules 2 and an adjustment mechanism 3, and mounts the lenses of the optical lens group 1 on the mounting modules 2. In the initial state, the multiple mounting modules 2 are held in the initial position; correspondingly, the distance and relative position between the multiple lenses of the optical lens group 1 are also held in the initial state, and the laser is modulated to form a beam with a specific focal depth to process the workpiece of the corresponding thickness.

[0040] When the thickness of the workpiece being processed changes, the relative position of the mounting module 2 is adjusted by the adjustment mechanism 3, thereby adjusting the relative position of the lenses. Changes in the relative position of the lenses will alter their modulation effect on the laser. For example, the beam expander unit 11 includes cooperating concave and convex lenses. After the beam is diffused, it is focused to form a parallel expanded beam. Adjusting the distance between the concave and convex lenses adjusts the size of the expanded beam, thereby changing parameters such as the depth of focus of the subsequent Bessel beam.

[0041] Thus, by adjusting the relative positions of the mounting module 2 and the lens, the overall modulation effect of the optical lens group 1 on the laser can be adjusted, and the focal depth of the final beam changes accordingly. The focal depth of the processing beam can be adjusted to the focal depth corresponding to the thickness of the workpiece after the thickness change.

[0042] Thus, in actual processing operations, when the thickness of the workpiece being processed changes, there is no need to disassemble or replace the lens. Simply adjust the position of the mounting module 2 through the adjustment mechanism 3 to adjust the relevant parameters of the focal depth of the output beam. This allows the settings to be adapted to workpieces of different thicknesses, greatly shortening the time required to adjust the processing equipment when the workpiece thickness changes and improving production efficiency.

[0043] The function of modulating the laser is realized by multiple units of the optical lens group 1. The multiple lenses that make up the optical lens group modulate the laser and convert the laser emitted by the laser into the laser beam required for processing.

[0044] Specifically, refer to Figure 1The beam expander 11 is used to increase the beam diameter of the laser, improve the uniformity of the beam, optimize the effect of subsequent modulation, and by increasing the beam diameter, the power density of the beam can be reduced, reducing the problem of damage to the lens used for subsequent modulation, and effectively utilizing the co-optic area of ​​the lens.

[0045] The beam expanding unit 11 includes a diffusion optical element 111 and a focusing optical element 112. The diffusion optical element 111 is configured to allow the laser emitted by the laser to enter and diffuse the laser, wherein the laser is an initial laser in a parallel beam state. The focusing optical element 112 is configured to allow the diffused laser to enter and focus the diffused laser to form a beam expanded laser in a parallel beam state, wherein the diameter of the beam expanded laser is larger than that of the initial laser.

[0046] For example, the diffusion optical element 111 includes a first convex lens 1111 and a concave lens 1112 arranged along the propagation direction of the laser. The distance between the concave lens 1112 and the first convex lens 1111 is greater than the focal length of the first convex lens 1111. The laser is focused by the first convex lens 1111 and diffuses after passing the focal point of the first convex lens 1111. The diffused beam propagates to the concave lens 1112 and continues to diffuse.

[0047] The focusing optical element 112 includes a second convex lens, which receives the light beam diffused by the diffusion optical element 111 and focuses it to form a parallel light beam, i.e., the aforementioned expanded laser beam. In other embodiments, the focusing optical element 112 may also include multiple lenses, and the light beam is focused to form a parallel light beam by combining multiple lenses. In this embodiment, the focusing optical element 112 is described as a second convex lens.

[0048] The modulation unit 12 is used to shape the laser beam, so that the laser beam is transformed from a Gaussian beam into a Bessel beam. By utilizing the long focal depth characteristics of the Bessel beam, it is more conducive to processing the workpiece such as deep hole machining.

[0049] The modulation unit 12 has a first surface and a second surface that are arranged opposite to each other along the propagation direction of the laser. The first surface is perpendicular to the propagation direction of the laser, and the expanded laser beam enters the modulation unit 12 through the first surface. The second surface is a conical surface, and the axis of the conical surface coincides with the axis of the expanded laser beam. The second surface is configured to modulate the expanded laser beam to form a Bessel beam.

[0050] For example, the modulation unit 12 is an axial pyramid.

[0051] The focusing unit 13 is used to focus the formed Bessel beam, so that the energy of the Bessel beam is more concentrated in the central spot. By focusing the Bessel beam to different degrees by the focusing unit 13, the size of the central spot of the final Bessel beam can be adjusted, so that it can be used to process structures of different sizes.

[0052] In this embodiment, the focusing unit 13 includes a third convex lens 131 and a fourth convex lens 132 arranged along the propagation direction of the laser. By selecting convex lenses with different curvatures, the laser beam can be focused to different degrees. In addition, a correction unit 14 can be provided between the third convex lens 131 and the fourth convex lens 132 to perform correction processing on the laser beam.

[0053] Thus, after the Bessel beam is modulated and formed, it is first focused to a certain extent by the third convex lens 131, so that the energy of the Bessel beam is concentrated at the central spot. The energy is more concentrated, which can reduce the energy dissipation in the subsequent propagation path. Furthermore, the correction effect is better when the correction is performed by the correction unit 14 compared to the case of energy dispersion.

[0054] For example, the correction unit 14 includes a cemented triplet lens, a negative meniscus lens, and a cemented doublet lens arranged sequentially along the propagation direction of the laser. The cemented triplet lens performs apochromatic correction on the laser, the negative meniscus lens performs spherical aberration correction, and the cemented doublet lens is used to compensate for the chromatic aberration that may be introduced by the negative meniscus lens, so as to ensure that the correction unit 14 has a better correction effect on the laser.

[0055] In practical use, the laser is modulated by the above-mentioned multiple lenses to form a laser beam suitable for processing workpieces of a specific thickness. When the thickness of the workpiece being processed changes, the overall processing effect of the optical lens group 1 on the laser can be changed by adjusting the relative positions between the lenses, thereby obtaining laser beams with different focal depths and diameters.

[0056] The specific method for adjusting the laser processing effect of optical lens group 1 by adjusting the relative positions of multiple lenses is as follows: Adjusting the distance between the first convex lens 1111, the concave lens 1112, and the second convex lens allows for adjustment of the beam-expanding laser diameter even when the diameter of the incident laser is limited. For example, increasing the distance between the three lenses increases the radial dimension of the laser beam propagating from the first convex lens 1111 to the concave lens 1112. After diffusion by the concave lens 1112, the radial dimension of the beam reaching the second convex lens also increases, thus increasing the radial dimension of the expanded laser beam and achieving adjustment of the laser beam expansion ratio.

[0057] For example, the first convex lens 1111, the concave lens 1112, and the second convex lens are respectively located on different mounting modules 2. In actual use, the positions of the three are adjusted separately by the adjustment mechanism 3. The laser emitted by the laser is a parallel beam. Adjusting the position of the first convex lens 1111 relative to the laser will not affect the radial dimension or other related parameters of the laser. Correspondingly, the mounting module 2 where the first convex lens 1111 is located can be set to be stationary relative to the laser.

[0058] Correspondingly, the expanded laser beam formed by the second convex lens is a parallel beam. Adjusting the distance between the modulation unit 12 and the second convex lens will not affect the radial dimension of the laser or the focal depth of the formed Bessel beam. Therefore, in actual setup, the modulation unit 12 and the second convex lens can be set on the same mounting module 2.

[0059] Of course, in some embodiments, the modulation unit 12 and the second convex lens may be mounted on different mounting modules 2 as needed.

[0060] The third convex lens 131 and the fourth convex lens 132 are also mounted on different mounting modules 2, and the third convex lens 131 and the modulation unit 12 are mounted on different mounting modules 2. In this way, when making adjustments, the distance between the modulation unit 12 and the third convex lens 131, and the distance between the third convex lens 131 and the fourth convex lens 132 can be adjusted respectively to adjust the radial dimension of the final laser beam.

[0061] In addition, when the optical lens group 1 includes the correction unit 14, the correction unit 14 and the fourth convex lens 132 are located on the same mounting module. Although the correction unit 14 will also produce a certain degree of focusing / diffusion effect on the laser beam, the main function of the correction unit 14 is to perform chromatic aberration and spherical aberration compensation correction on the laser. The focusing effect can be adjusted by adjusting the position of the third convex lens 131 and the fourth convex lens 132, thereby changing the focal depth and radial dimension of the final laser beam.

[0062] Furthermore, the correction unit 14 and the fourth convex lens 132 are located on the same mounting module 2. After the laser beam is corrected, it is focused and then input for processing. This shortens the propagation distance after the correction unit 14, which can reduce the occurrence of chromatic aberration and spherical aberration in the laser beam over a certain length. It can also reduce the complexity of the structure, improve the compactness of the structure, and make better use of space.

[0063] When using this laser lens to process a workpiece, once the thickness of the workpiece is determined, the relevant parameters of the processing laser to be used are also determined. With the laser emitted by the laser fixed and the parameters of multiple lenses (referring to the material and curvature of the lenses) fixed, the initial laser is modulated by adjusting the distance between the multiple lenses to obtain the required processing laser.

[0064] After the thickness of the workpiece being processed changes, the relative positions between multiple lenses are adjusted to adjust the modulation effect of the optical lens group 1 on the initial laser, thereby obtaining the required processing laser.

[0065] During the adjustment of lens positions, attention should be paid to the joint adjustment of multiple lenses. For example, increasing the distance between the first convex lens 1111 and the concave lens 1112 can increase the radial size of the obtained expanded laser beam. However, this may result in the radial size of the laser beam being too large when it reaches the second convex lens after passing through the concave lens 1112, causing the second convex lens to be unable to fully receive the laser beam and resulting in energy waste. Alternatively, the distance between the first convex lens 1111 and the concave lens 1112 may be too large, causing the concave lens 1112 to be unable to fully receive the laser beam and resulting in energy waste.

[0066] Therefore, the positions of the first convex lens 1111 and the concave lens 1112, as well as the positions of the concave lens 1112 and the second convex lens, need to be adjusted synchronously and adaptively to ensure that while expanding the laser beam, the laser beam can pass through the corresponding lenses during propagation, so as to make full use of the laser and reduce energy waste.

[0067] The following describes the specific structure for adjusting the position of each lens.

[0068] refer to Figure 2 The mounting module 2 is ring-shaped, with a channel for laser propagation formed on its inner side. A lens is installed in the channel to modulate the laser. The mounting module 2 includes a mounting part 21 and a connecting part 22. The lens is connected to the inner peripheral sidewall of the mounting part 21, and the mounting part 21 is threaded to the inner side of the connecting part 22 of the adjacent mounting module 2 to realize the connection between the mounting modules 2.

[0069] For example, the inner peripheral sidewalls of the multiple mounting portions 21 are located within the same annular surface, meaning that the radial dimension of the formed channel in the laser propagation direction is constant; the aforementioned radial dimension refers to the dimension of the channel in the direction perpendicular to the laser propagation direction. Of course, in other embodiments, the dimensions of the inner peripheral sidewalls of the multiple mounting portions 21 can be adaptively adjusted according to actual needs, as long as it can ensure stable laser propagation without obstructing the laser.

[0070] For ease of description, the two adjacent installation modules 2 are defined as the first installation module 2a and the second installation module 2b, respectively, wherein the second installation module 2b is located on the side of the first installation module 2a along the laser propagation direction.

[0071] The mounting portion 21 of the rear mounting module 2b is inserted inside the connecting portion 22 of the first mounting module 2a, and the mounting portion 21 is threadedly connected to the connecting portion 22, thereby connecting the first mounting module 2a and the rear mounting module 2b. In this way, by rotating the first mounting module 2a and the rear mounting module 2b relative to each other, the relative positions of the two mounting modules 2 and the lenses connected to the two mounting modules 2 can be adjusted.

[0072] refer to Figure 2 and Figure 3 The adjustment mechanism 3 is disposed on the connecting part 22 of the first mounting module 2 and is used to drive the second mounting module 2b to rotate relative to the first mounting module 2a. Through the threaded engagement between the two, the two slide in the laser propagation direction, thereby adjusting the position of the lenses mounted on the two mounting modules 2 in the laser propagation direction.

[0073] Specifically, the adjustment mechanism 3 includes a worm gear 31 rotatably connected to the connecting part 22, and the rotation axis of the worm gear 31 is perpendicular to the propagation direction of the laser. Correspondingly, a worm gear tooth 32 is provided on the outer peripheral surface of the mounting part 21. The worm gear tooth 32 is adapted to the tooth structure on the worm gear 31, so that the mounting part 21 and the worm gear 31 form a worm gear and worm gear engagement through the provided worm gear tooth 32.

[0074] When the relative position of the mounting module 2 needs to be adjusted by the adjustment mechanism 3, the worm gear 31 is driven to rotate. Through the worm wheel and worm gear cooperation, the mounting part 21 of the rear mounting module 2b can be driven to rotate relative to the connecting part 22 of the first mounting module 2a. The two are threadedly connected, and their relative rotation is converted into relative displacement in the laser propagation direction through the threaded cooperation. This realizes the adjustment of the distance of the lens in the laser propagation direction, that is, the adjustment of the laser beam modulation effect, so that the final output beam is more suitable for processing workpieces of corresponding thickness.

[0075] In the actual adjustment process, through the worm gear engagement and the helical engagement between adjacent mounting modules 2, the rotation of the worm 31 is converted into the rotation of the mounting module 2, and then into the displacement of the mounting module 2 along the laser propagation direction. It should be noted that the transmission ratio of the worm gear drive is greater than 1 in most cases, and the transmission ratio of the worm gear drive engagement in this embodiment is also greater than 1, thus achieving speed reduction in the transmission engagement. The transmission ratio refers to the ratio of the input speed to the output speed.

[0076] With the configuration of this embodiment, when adjusting the lens position, rotating the worm gear 31 ultimately drives the mounting module 2 and the lens to move along the laser propagation direction, achieving high precision. That is, a larger rotation of the worm gear 31 results in a smaller displacement of the mounting module 2. This provides higher precision in adjusting the lens position, reducing deviations from the set position after adjustment, which could lead to poor workpiece processing quality. It also improves the precision of laser lens adjustment and the processing quality of workpieces of varying thicknesses.

[0077] The adjustment mechanism 3 also includes a power component 33 for driving the worm gear 31 to rotate. The power component 33 is connected to the connecting part 22 and is connected to the worm gear 31 in a transmission manner. When the power component 33 works, it drives the worm gear 31 to rotate relative to the connecting part, and then drives the mounting part 21 to rotate through the cooperation between the worm gear 31 and the mounting part 21, thereby realizing the adjustment of the position of the mounting module 2 in the laser propagation direction.

[0078] For example, the power component 33 is a servo motor. Of course, in actual use, a gear set, a transmission or other components can also be set between the power component 33 and the worm gear 31 for transmission. The specific transmission structure will not be described in detail in this disclosure.

[0079] Compared to manual adjustments by staff, the use of a power component 33 to drive the worm gear 31 to rotate, thereby adjusting the position of the mounting module 2, i.e. the lens, in the laser propagation direction, eliminates the need for manual operation, making it more convenient and labor-saving, significantly reducing manpower requirements, and improving the safety of the operation process to some extent. On the other hand, it reduces the errors that may occur during manual adjustment, improving the accuracy of the adjustment.

[0080] Furthermore, based on the unidirectional transmission and reverse self-locking properties of the worm gear transmission mechanism, after the adjustment of the lens position is completed, the power component 33 is in the closed state, that is, the worm 31 is in the stationary state, which can reduce the risk of the installation module 2 shifting under the influence of factors such as gravity, vibration, and external force, and improve the stability of the relative position of the lens.

[0081] To achieve more comprehensive automatic adjustment of the lens position, the laser lens in this embodiment of the present disclosure also includes a control system 4 for controlling the actions of each adjustment mechanism 3; the control system 4 includes an information acquisition module 41 and a controller 42, wherein the information acquisition module 41 is used to obtain the thickness of the workpiece to be processed. For example, the information acquisition module 41 is an electronic input device, and the operator manually inputs the thickness information of the workpiece or the code of the workpiece through the electronic input device, and the thickness of the workpiece is automatically obtained through the database.

[0082] In other embodiments, the information acquisition module 41 can also be configured as a sensor element to automatically scan and identify the thickness of the workpiece; for example, if the workpiece has an identification code containing workpiece-related information, such as a barcode or QR code, the information acquisition module 41 can be a scanner to scan the identification code and obtain the workpiece's thickness information; alternatively, the information acquisition module 41 can be configured as an infrared sensor to detect and obtain the workpiece's thickness. In this embodiment, the information acquisition module 41 is described as an electronic input device.

[0083] The controller 42 is signal-connected to the information acquisition module 41, receives the thickness data acquired by the information acquisition module, and determines the spacing between the corresponding lenses based on the acquired thickness data. The controller 42 is also signal-connected to the power component 33, sending action commands to the power component 33 to control the power component 33 to adjust the spacing between the corresponding mounting modules 2 to a set value. Specifically, the set value refers to the laser beam modulated from the laser when the spacing between the lenses is maintained at the set value, making it suitable for processing workpieces of the corresponding thickness.

[0084] It should be noted that the controller 42 determines the spacing between the lenses based on the workpiece thickness data, and can determine the appropriate focal depth parameters of the processing beam based on the workpiece thickness. Then, based on the required focal depth parameters and the relevant parameters of the laser emitted by the laser, it determines the relative positional relationship of multiple lenses to adjust the overall modulation effect of the optical lens group 1 on the laser beam. The specific correspondence can be calculated and determined by those skilled in the art based on relevant knowledge, or it can be determined through preliminary experiments to obtain the relative positions of each lens when processing workpieces of different thicknesses with a suitable processing beam. The specific experimental process will not be described in this embodiment.

[0085] Thus, during actual processing, when the thickness of the workpiece changes, the corresponding information is input through the information acquisition module 41. The controller 42 determines the relative position of each lens based on the acquired information and then sends an action command to the power component 33 to control the power component 33 to adjust the position of each mounting module 2 and lens. Adjusting the optical lens group 1 after changing workpieces of different thicknesses is simple and efficient.

[0086] To further improve the accuracy of adjusting the lens position, refer to Figure 4 The control system 4 also includes a feedback module 43, which is connected to the controller 42. The feedback module 43 is used to detect the distance between the corresponding lenses, obtain the distance detection value, and transmit the obtained distance detection value to the controller 42. The controller 42 is also used to control the power component 33 to stop working when the detection value is the same as the set value of the distance, and lock the mounting module 2 and the lens in the corresponding position.

[0087] In this way, during actual use, the deviation between the adjusted lens position and the set value can be reduced, further improving the accuracy of lens position adjustment.

[0088] It should be noted that the feedback module 43 detects the spacing between the lenses by directly detecting the spacing between the lenses, by detecting the spacing between the corresponding mounting modules 2, or by measuring the angle rotated by the worm gear 31 (or mounting module 2) and obtaining the spacing between the lenses through the data correspondence.

[0089] Taking the determination of lens spacing by measuring the angle rotated by worm 31 as an example, feedback module 43 is an angle encoder. The angle encoder is connected to the drive shaft of worm 31 or power component 33, detects the rotation angle, and determines the amount of lens position adjustment based on the detected rotation angle through the transmission ratio of worm gear and screw. The specific usage of the angle encoder is well known to those skilled in the art, and its specific installation structure will not be described in detail.

[0090] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications or equivalent substitutions made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A laser lens, characterized in that, The laser lens is used to modulate the laser emitted by the laser. An optical lens assembly includes a beam expander, a modulation unit, and a focusing unit arranged along the propagation direction of the laser, each unit including a plurality of lenses for modulating the laser; Multiple mounting modules are arranged along the propagation direction of the laser, and the multiple mounting modules are configured to mount lenses of multiple units of the optical lens group, with each mounting module having at least one lens; An adjustment mechanism, connected between two adjacent mounting modules, is used to adjust the relative position of the two adjacent mounting modules.

2. The laser lens according to claim 1, characterized in that, The beam expanding unit includes a diffusion optical element and a focusing optical element; The diffusion optical element is configured to allow the laser to enter and diffuse; The focusing optical element is configured to allow the diffused laser to enter and focus the diffused laser to form a parallel-propagating expanded laser beam with an increased diameter relative to the laser beam.

3. The laser lens according to claim 1 or 2, characterized in that, The modulation unit has a first surface and a second surface that are arranged opposite to each other along the propagation direction of the laser. The first surface is perpendicular to the propagation direction of the laser, and the expanded laser beam enters the modulation unit through the first surface; The second surface is a conical surface, the axis of which coincides with the axis of the beam-expanding laser, and the second surface is configured to modulate the beam-expanding laser to form a Bessel beam.

4. The laser lens according to claim 3, characterized in that, When the beam expanding unit includes a diffusion optical element and a focusing optical element, the diffusion optical element, the focusing optical element, and the modulation unit are respectively connected to separate mounting modules; Alternatively, the diffusion optics are connected to a separate mounting module, and the focusing optics and the modulation unit are connected to another identical mounting module.

5. The laser lens according to claim 1, characterized in that, The focusing unit includes at least a third convex lens and a fourth convex lens, wherein the fourth convex lens is located on one side of the third convex lens along the propagation direction of the laser. The fourth convex lens is the output end of the focusing unit; The optical lens assembly also includes a correction unit for correcting the laser aberration. The correction unit is located on the side of the fourth convex lens facing the third convex lens and is disposed adjacent to the fourth convex lens.

6. The laser lens according to claim 1, characterized in that, The mounting module is ring-shaped and includes a mounting section and a connecting section; The lens is connected to the inner peripheral sidewall of the mounting part; The mounting part is threadedly engaged with the connecting part of the adjacent mounting module; The adjustment mechanism is connected between the threaded connection part and the mounting part, and is used to drive the mounting part to rotate relative to the connection part, so as to drive the two mounting modules to slide relative to each other.

7. The laser lens according to claim 6, characterized in that, The adjustment mechanism includes: The worm gear teeth are provided on the mounting part; The worm gear is rotatably connected to the connecting part and forms a worm gear engagement with the worm wheel teeth on the corresponding mounting part. A power component is connected to the connecting part and to the worm gear transmission to drive the worm gear to rotate relative to the connecting part.

8. The laser lens according to claim 1, characterized in that, It also includes a control system, which includes: The information acquisition module is used to obtain the thickness of the workpiece to be processed; The controller is connected to the information acquisition module, receives the thickness data acquired by the information acquisition module, and determines the spacing between the corresponding lenses based on the thickness data. The controller is also signal-connected to the adjustment mechanism, and sends action commands to the adjustment mechanism to adjust the position of the corresponding mounting module to the distance between the lens and the set value.

9. The laser lens according to claim 8, characterized in that, It also includes a feedback module connected to the controller signal, the feedback module being used to detect the spacing between adjacent installation modules, obtain a spacing detection value, and transmit the spacing detection value to the controller; The controller is also used to control the adjustment mechanism to lock the position of the installation module when the spacing detection value is the same as the set value.

10. A laser cutting device, characterized in that, Includes a laser and a laser lens as described in any one of claims 1-9; The laser lens is used to shape and focus the laser beam emitted by the laser.

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