An irregular light spot generating device

Abstract

The application discloses a special-shaped light spot generating device, which comprises a laser emitter, at least two mask plates and a beam expanding and collimating mirror group. The laser emitter is used for emitting a homogenized laser beam. One of the mask plates is arranged on the light path of the laser emitter in an inclined manner. The mask plate has a special-shaped reflecting surface and a transmitting surface. Part of the laser beam is reflected by the special-shaped reflecting surface to form a special-shaped light beam and acts on a working surface. The remaining part of the laser beam is transmitted through the transmitting surface. The beam expanding and collimating mirror group is arranged on the light path of the transmitting surface. One of the mask plates is arranged on the light path of the beam expanding and collimating mirror group. The laser beam which has been expanded and collimated passes through the special-shaped reflecting surface to form a special-shaped light beam and acts on the working surface. The application can effectively improve the energy utilization rate, solve the problem of large energy loss of the traditional mask plate in the high-power scene, and provide structural support for high-power output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser devices, and in particular to a special-shaped light spot generating device. BACKGROUND

[0002] High-power laser homogenization light spots are widely used in the field of laser heating. Laser heating technology realizes the heating process by acting on the material with laser energy, and makes the material sequentially undergo heating, melting, boiling, and even ionized plasma through the effect of heat transfer. Thanks to the precise control of laser spot size and heating time, combined with the synergistic effect of a pyrometer, this technology can achieve precise control of heating temperature and heating time. At the same time, by quickly turning off the laser, the cooling time and cooling rate can be flexibly adjusted, and the deep undercooling control goal can be easily achieved.

[0003] Currently, in high-power laser heating devices, the output homogenization light spot of a fiber laser is circular, and the output homogenization light spot of a semiconductor laser after homogenization combination is rectangular. The above light spots can be adjusted in size by beam expansion to adapt to different heating scene requirements when applied.

[0004] However, the homogenization light spots output by existing lasers are all regular circles or rectangles, and cannot directly generate special-shaped light beams. In actual applications, when a special-shaped light beam is needed, the existing technology usually adopts two ways to prepare, namely, beam splicing and mask blocking. Among them, the mask blocking method has little effect in the small-power special-shaped laser generation scene, but in the high-power working condition, the blocking area will cause a large amount of laser energy loss, which seriously reduces the energy utilization rate. The beam splicing method has inherent defects, and the special-shaped light beam formed by splicing is prone to uneven light intensity distribution at the joint, which is difficult to guarantee the homogenization effect of the light beam, and further affects the stability of the subsequent heating process and the processing quality. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a special-shaped light spot generating device to solve the technical problems existing in the prior art.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] In one aspect, a special-shaped light spot generating device is provided, comprising: a laser emitter, at least two masks, and an expansion collimation lens group; the laser emitter is used to emit a homogenized laser beam, one of the masks is obliquely arranged on the light path of the laser emitter, the mask has a special-shaped reflection surface and a transmission surface, part of the laser beam is reflected by the special-shaped reflection surface to form a special-shaped light beam and acts on a work surface, and the rest of the laser beam is transmitted through the transmission surface; the expansion collimation lens group is arranged on the light path of the transmission surface, and one of the masks is arranged on the light path of the expansion collimation lens group; the laser beam collimated and expanded by the expansion collimation lens group passes through the special-shaped reflection surface to form a special-shaped light beam and superimposes on the work surface.

[0008] The size of the laser beam collimated and expanded by the expansion collimation lens group is equal to the size of the laser beam emitted by the laser emitter.

[0009] Further, the expansion collimation lens group comprises an expansion lens and a collimation lens, the expansion lens is arranged on the light path of the transmission surface, the collimation lens is arranged on the light path of the expansion lens, and one of the masks is arranged on the light path of the collimation lens.

[0010] Further, a plurality of expansion collimation lens groups are arranged, and the incident light path and the exit light path of the expansion collimation lens group are arranged with the masks.

[0011] Further, a reflecting mirror is further included, the reflecting mirror can be arranged on the reflection light path of the special-shaped reflection surface, so that all the special-shaped light beams act on the same work surface.

[0012] Further, a plurality of expansion lenses are further included, the expansion lenses are arranged one by one on the reflection light path of the special-shaped reflection surface, so as to enlarge or reduce the special-shaped light beams.

[0013] Further, the special-shaped reflection surface is a character-shaped surface.

[0014] Further, the laser emitter is a semiconductor laser emitter.

[0015] Further, the laser beam emitted by the laser emitter is rectangular or circular.

[0016] Further, one of the masks is obliquely arranged on the light path of the laser emitter, and one of the masks is obliquely arranged on the light path of the expansion collimation lens group, so that the two reflected special-shaped light beams act on the same work surface.

[0017] The beneficial effects of the present application are: it can effectively improve the energy utilization rate, solve the problem of large energy loss of traditional mask light blocking in high-power scenarios, abandon the light blocking loss mode, recover the unreflected light beam through the transmission surface, realize full utilization of energy through expansion collimation and secondary reflection superposition, reduce waste, and provide structural support for high-power output. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described in detail below according to the drawings and embodiments.

[0019] Fig. 1 The schematic diagram of the special-shaped light spot generating device according to the embodiment of the present application is shown in the figure.

[0020] Fig. 2 The schematic diagram of the light path transmission of the special-shaped light spot generating device according to the embodiment of the present application is shown in the figure.

[0021] Fig. 3 The schematic diagram of the mask according to the embodiment of the present application is shown in the figure.

[0022] In the figure: 1, laser emitter; 2, mask; 21, special-shaped reflecting surface; 22, transmission surface; 3, expansion collimation lens group; 31, expansion lens; 32, collimation lens; 4, working surface; 5, reflecting mirror. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0026] As shown in Figs. 1-3 The embodiment provides a special-shaped light spot generating device, which comprises a laser emitter 1, at least two mask plates 2 and a beam expander collimator group 3. The laser emitter 1 is used for emitting a homogenized laser beam. One of the mask plates 2 is arranged on an outgoing light path of the laser emitter 1 in an inclined manner. The mask plate 2 has a special-shaped reflecting surface 21 and a transmitting surface 22. Part of the laser beam is reflected by the special-shaped reflecting surface 21 to form a special-shaped light beam and acts on a working surface 4. The rest of the laser beam is transmitted through the transmitting surface 22. The beam expander collimator group 3 is arranged on an outgoing light path of the transmitting surface 22. One of the mask plates 2 is arranged on an outgoing light path of the beam expander collimator group 3. The laser beam expanded and collimated by the beam expander collimator group 3 passes through the special-shaped reflecting surface 21 to form a special-shaped light beam and superimposes on the working surface 4.

[0027] In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0028] Based on the above scheme, the laser emitter 1 first emits a high-power homogenized laser beam, which is directly incident on the first mask plate 2 along the preset light path. The mask plate 2 is fixed on the exit light path of the laser emitter 1, and its surface is divided into an irregular reflection surface 21 and a transmission surface 22 according to the preset irregular processing requirements. The irregular reflection surface 21 adopts a high-precision reflection coating that is adapted to the shape of the target light spot, and can direct the light beams in the corresponding area of the incident light beam for directional reflection, directly forming an irregular light spot that meets the processing requirements. The light spot is accurately projected onto the work surface 4 to complete the basic irregular processing. The remaining light beams that are not reflected pass through the transmission surface 22 and enter the subsequent light path, effectively avoiding the energy loss caused by the traditional light blocking mode. The transmitted light beam continues to propagate to the beam expansion and collimation lens group 3 provided on the transmission light path. The lens group cooperates with multiple lenses to accurately correct the beam divergence angle and optimize the beam parallelism, and at the same time, regulates the size and divergence angle of the transmitted light beam to be completely consistent with the original exit light beam of the laser emitter 1, ensuring that the homogenization characteristics and propagation directionality of the light beam are not affected, and providing matching light path conditions for subsequent light spot superposition. Subsequently, the light beam after the beam expansion and collimation processing is incident on the second mask plate 2, which has the same specifications as the irregular reflection surface 21 of the first mask plate 2 and is accurately fixed on the exit light path of the beam expansion and collimation lens group 3. The light beam is reflected again by the irregular reflection surface 21 of the second mask plate 2 to form an irregular light spot with the same specifications and homogenization degree. Finally, the initial irregular light spot reflected by the first mask plate 2 is accurately superimposed on the preset area of the same work surface 4, realizing secondary forming and energy strengthening.

[0029] Based on the above principle, the effect of the device is as follows: it can effectively improve the utilization rate of laser energy, and solve the problem of direct energy loss and low energy conversion efficiency of traditional mask blocking method in high-power scene. It completely abandons the passive light blocking energy loss mode, and recovers the laser beams that are not reflected through the transmission surface 22 of the first mask 2, avoids the waste of these beams due to shielding, and accurately corrects the light path of the recovered beams through the beam expander collimator group 3, and controls them to the same size and divergence angle as the original incident beam, ensuring that the beam directionality and uniformity characteristics are not affected. Then, through the special-shaped reflecting surface 21 of the second mask 2, the laser energy is fully utilized for the working surface 4 processing, greatly reducing the energy loss rate under high-power working conditions, and avoiding the device overheating and loss due to energy accumulation at the mask light blocking position, providing reliable structure and energy utilization support for stable high-power laser output of the device. At the same time, it can guarantee the uniformity effect of the special-shaped light spot, avoid the defect of uneven joint light intensity of beam splicing, and generate homologous uniform light spots through the special-shaped reflecting surface 21 of the two masks 2. After superposition, the light intensity distribution is optimized and the joint hidden danger is eliminated, ensuring that the working surface 4 obtains uniform and stable special-shaped light spots, and improving the processing consistency and quality. Moreover, it takes into account the processing effect and practicality, and the secondary light spot superposition strengthens the energy effect. Compared with single light spot processing, the special-shaped structure is more accurate and efficient, the device itself has a simple structure, does not need complex splicing and control, is easy to assemble and debug, and can be flexibly adapted to high-power laser heating scenes, and has practicality and economy.

[0030] Further, the beam expander collimator group 3 includes a beam expander 31 and a collimator 32. The beam expander 31 is arranged on the exit light path of the transmission surface 22, and the collimator 32 is arranged on the exit light path of the beam expander 31. One of the masks 2 is arranged on the exit light path of the collimator 32. The beam expander collimator group 3 is composed of the beam expander 31 and the collimator 32 in series, and they are assembled according to the preset light path accuracy to form a beam control unit with clear division of labor. The beam expander 31 is accurately arranged on the exit light path of the transmission surface 22 of the first mask 2. After receiving the laser beams recovered by the transmission surface 22, the beam expander 31 performs directional beam expansion processing based on the principle of geometric optics, accurately controls the size of the beam to the same specification as the original incident beam of the laser emitter 1, and provides a basis for the size matching of subsequent light spot superposition. The expanded beam propagates along the light path to the collimator 32 arranged on the exit light path of the beam expander 31. The collimator 32 corrects the beam divergence angle and optimizes the beam wavefront phase to eliminate the beam deviation and divergence hidden danger generated in the beam expansion process, so that the expanded beam has the same parallelism and uniformity characteristics as the original incident beam, ensuring that the beam propagation direction is accurately controllable. The beam processed by the collimator 32 is incident on the second mask 2 arranged on its exit light path, providing stable light path protection for the mask 2 to reflect a standard special-shaped light spot and realize accurate superposition.

[0031] The split beam expanding collimating mirror group 3 structure has the following advantages: first, the precision and independent optimization of beam control are realized. Compared with the integrated beam expanding collimating structure, the split beam expanding mirror 31 and the collimating mirror 32 can be individually adjusted and calibrated for beam size and parallelism, which can accurately ensure that the beam size after beam expanding is consistent with the original beam, and can maximize the optimization of beam homogenization and directivity, avoiding the mutual interference of single parameter adjustment on the two indicators in the integrated structure, and improving the precision of light path control. Second, the stability of high-power beam processing is strengthened. The independent collimating mirror 32 can correct such defects, ensuring that the beam remains uniform and parallel before being transmitted to the second mask 2, laying the foundation for the accurate superposition of the secondary reflection spot and the initial spot, and further avoiding the problem of uneven light intensity after spot superposition. Third, the adaptability and maintenance convenience of the device are improved. The split structure allows the beam expanding mirror 31 and the collimating mirror 32 to be individually replaced or adjusted according to actual processing needs (such as different power levels and different irregular spot sizes), without the need to replace the entire beam expanding collimating unit, reducing equipment debugging and maintenance costs. At the same time, the clear division of labor in the structure design also reduces the impact of single device failure on the entire light path system, improving the running reliability of the device under high-power working conditions.

[0032] Further, a plurality of beam expanding collimating mirror groups 3 are provided, and the incident light path and the exit light path of the beam expanding collimating mirror group 3 are provided with the mask 2. For the series connection of multiple beam expanding collimating mirror groups 3 and masks 2, the working principle is as follows: the beam expanding collimating mirror groups 3 are arranged in series along the laser beam propagation direction, and each beam expanding collimating mirror group 3 is provided with a mask 2 corresponding to the incident light path and the exit light path, forming a unitized light path module of mask 2-beam expanding collimating mirror group 3-mask 2, and each module is connected in sequence according to the preset light path accuracy, forming a circulating beam recycling and forming system. After the initial laser beam is reflected by the first mask 2 to form an irregular spot superimposed on the working surface 4, the transmitted beam enters the first beam expanding collimating mirror group 3 to complete the beam expanding collimation processing, and then is incident to the mask 2 of the exit light path, and the irregular spot is formed again by reflection to be superimposed on the working surface 4, and the remaining transmitted beam enters the next beam expanding collimating mirror group 3. In this way, each module repeats the process of transmitted beam recycling-beam expanding collimation correction-mask 2 reflection forming-spot superposition until the laser beam energy is attenuated to the extent that it cannot meet the processing requirements and is exhausted, realizing the stepwise recycling and maximum utilization of beam energy.

[0033] The series structure has the following advantages: first, the laser energy utilization rate is significantly improved. Compared with single or two-module design, the multi-group series structure can perform stepwise recycling of the laser beam, converting the unreflected transmission energy of each level into effective processing spots through subsequent modules, completely changing the status quo of direct loss of unused energy in traditional technology, greatly reducing the energy waste rate under high-power laser working conditions, maximizing the use of limited laser energy, and further strengthening the high-power output adaptation capability of the device. Second, the light intensity distribution and processing effect of the special-shaped spot are optimized. The same source special-shaped spots formed by the reflection of multiple masks 2 are sequentially superimposed, and the light intensity uniformity of the work surface 4 can be optimized through multiple rounds of energy supplementing, avoiding the local energy shortage problem that may occur after single or a few times of superimposing. At the same time, the total energy density after superposition is easier to control, which can adapt to different depth and precision special-shaped processing requirements, and improve the flexibility of the processing technology. Third, it has good structure expansion and adaptability. The number of series modules can be flexibly increased or decreased according to the initial laser power and processing energy demand, without the need for significant modification of the core optical path structure. It can adapt to low-power small-range processing scenarios and meet the needs of high-power long-time continuous processing. The structures of the modules are consistent, which continues the independent debugging advantage of the split beam expander collimator group 3, facilitating equipment assembly, parameter calibration and later maintenance, and reducing the equipment adaptation cost under different working conditions. Fourth, the light path running stability is improved. The stepwise energy attenuation mode can avoid overheating and loss of single modules due to bearing too high energy, prolong the service life of core devices such as masks 2 and beam expander collimator groups 3, and ensure the stability and reliability of the device under high-power and long-time running conditions.

[0034] In the optical path system in which multiple beam expander collimator groups 3 and masks 2 are connected in series, each mask 2 is precisely designed so that the energy distribution ratio of the reflection area and the transmission area to the incident light beam is 1:1, i.e., the incident light beam energy is equally divided into reflected energy and transmitted energy. After the initial laser beam is incident on the first mask 2, 1 part of the energy is reflected by the special-shaped reflection surface 21 to form a spot superimposed on the work surface 4, and the remaining 1 part of the energy is transmitted through the transmission surface 22 into the first beam expander collimator group 3. After expansion and collimation correction, it is incident on the mask 2 of the exit light path of this group. At this time, the mask 2 again divides 1 part of the incident energy, of which 1 / 2 part of the energy is reflected to form a spot superimposed on the work surface 4, and the remaining 1 / 2 part of the energy is transmitted into the next beam expander collimator group 3. In this way, each mask 2 follows the 1:1 energy distribution rule, and the reflected beam energy is sequentially attenuated in a stepwise manner at a ratio of 1, 1 / 2, 1 / 4, 1 / 8, …, until the beam energy is attenuated to near zero and cannot meet the processing requirements, realizing the step-by-step recycling and full utilization of the homogenized beam energy.

[0035] It is worth mentioning that a mirror 5 can be arranged on the reflection path of the irregular reflection surface 21 to make all irregular light beams act on the same working surface 4. The mirror 5 can be flexibly arranged on the reflection path of the irregular reflection surface 21 of each mask 2 according to the layout requirements of the light path, and serves as a core component for light beam turning and accurate guiding. By configuring the mirror 5 on the corresponding reflection path, the light beam propagation angle can be accurately adjusted, and each level of reflected light beam can be oriented and guided to correct the irregular light beam. All irregular light beams of different levels and different propagation directions can converge according to the preset path and accurately act on the specified processing area of the same working surface 4, ensuring the spatial coincidence of the multi-wheel superimposed light spot. At the same time, the position of the mirror 5 can be adjusted as needed to adapt to different numbers of serial modules and light path arrangement scenes, ensuring the flexibility of light path adjustment.

[0036] The mirror structure has the following advantages: first, it ensures the spatial accuracy of the multi-wheel superimposed light spot, solves the problem of light spot deviation and superposition misalignment caused by the difference in propagation direction of different levels of reflected light beams in multiple serial modules, and makes all irregular light beams converge on the same working surface 4 through the directional guiding effect of the mirror 5, ensuring the shape integrity and uniformity of the light intensity distribution of the superimposed light spot, and further improving the size accuracy and process stability of irregular processing. Second, it improves the flexibility and compatibility of the device light path layout. Multiple serial modules can cause the light path to be too long or complex in direction. The mirror 5 can change the propagation direction of the light beam to realize the bending and optimization of the light path, without being limited to linear light path layout, effectively saving equipment installation space, and adapting to the light path requirements of different site conditions and processing scenes, enhancing the overall adaptability of the device. Third, it enhances the convenience and accuracy of light path regulation. The mirror 5 can realize accurate calibration of the light beam propagation path by adjusting the angle, which is convenient for quickly correcting the landing point of each level of light beam during equipment assembly and debugging, and can also be adjusted in real time during long-term operation to correct the light beam deviation, reduce the difficulty of light path calibration, and ensure the stability of the light path when multiple modules work together, providing reliable support for the full use of light beam energy and the optimization of processing effect.

[0037] Preferably, the laser beam transmitted through the transmission surface 22 is too large in divergence angle and covers a wide range, which cannot be completely captured by a single beam expander and collimator lens group 3. The working principle is as follows: on the corresponding transmission light path, multiple beam expander and collimator lens groups 3 are added along different dimensions of the beam divergence to form a multi-directional beam capture and regulation unit. Typically, dedicated beam expander and collimator lens groups 3 can be configured in the left-right and up-down directions respectively. The beam expander and collimator lens groups in each direction accurately capture and regulate the light beam in the corresponding dimension. The light beam diverging in that direction is first converged by a directional capture assembly, and then gradually calibrated in size and propagation direction through expansion and collimation. The lens groups in the left-right and up-down directions work together to regulate the light beam in the corresponding dimension, and finally calibrate the size, uniformity and parallelism of the entire transmitted light beam to be exactly the same as the original emitted light beam of the laser emitter 1, ensuring that the processed light beam can accurately enter the subsequent mask 2 and smoothly participate in the irregular reflection and spot superposition process without affecting the continuity and stability of the overall optical path.

[0038] The multi-directional beam expander and collimator lens group 3 has the following advantages: first, it solves the technical problem of insufficient beam capture capacity of a single lens group, avoids the loss of part of the energy that cannot be captured due to the divergence of the transmitted light beam, especially adapts to the working condition of large-scale divergence of high-power laser beams, ensures that the entire transmitted light beam enters the subsequent optical path, and further strengthens the core advantage of full energy utilization, providing energy support for the stable output of customized high-power uniformized light beams. Second, it improves the accuracy and adaptability of beam regulation. By regulating in the left-right and up-down directions, it can correct the beam divergence defects in different dimensions. Compared with the global regulation of a single lens group, it can more accurately control the beam size and uniformity, avoid interference with the beam characteristics in other dimensions caused by single-dimensional regulation, ensure that the calibrated light beam is highly matched with the original light beam specifications, and ensure the accuracy of subsequent multi-round spot superposition, maintaining the advantages of seamless and highly uniform output light beams. Third, it enhances the adaptability of the device to complex beam conditions. The number and configuration direction of the beam expander and collimator lens groups 3 can be flexibly increased or decreased according to the actual divergence range and energy distribution of the transmitted light beam without reconstructing the core optical path. It can adapt to small-scale divergent light beams and large-scale divergent light beams in high-power working conditions, expanding the application range of the device and improving the flexibility and practicality of the overall structure.

[0039] In an optional solution, a plurality of beam expanders 31 are further included, which are respectively arranged one-to-one on the reflection light path of the shaped reflection surface 21 to enlarge or reduce the shaped light beam. The beam expanders 31 are arranged one-to-one with the shaped reflection surface 21 of each mask plate 2 and are respectively arranged accurately on the reflection light path of each level of the shaped reflection surface 21 to form an independent reflection light beam size regulation unit. Before the light beam acts on the working surface 4, the size is adjusted by the corresponding beam expander 31, and the actual size of the shaped light spot can be adjusted according to the actual size requirement, and the light beam is enlarged or reduced individually. The uniformity and shape integrity of the light beam are maintained synchronously during the adjustment process to avoid distortion of the light intensity distribution caused by size regulation. The adjusted shaped light beam is accurately guided by the reflector and is sequentially superimposed on the working surface 4 with other adjusted light beams to form a shaped high-power uniform light beam with accurate size and processing requirements, and the advantage of no splicing joint is maintained throughout the process.

[0040] Specifically, the shaped reflection surface 21 is a character-shaped surface. The shaped reflection surface 21 of each mask plate 2 adopts a precisely processed character-shaped structure, that is, the reflection area is a character-shaped profile with an inner ring and an outer ring nested, the effective reflection area is between the inner ring and the outer ring, the remaining area is a transmission area, and the character-shaped reflection surface and the transmission area are precisely divided according to a 1:1 energy ratio. After the uniform light beam emitted by the laser emitter 1 is incident on the mask plate 2, only the character-shaped reflection surface area reflects the light beam directionally to form a character-shaped shaped light beam, which is adjusted in size by the beam expander 31 on the corresponding reflection light path and then guided to the working surface 4 by the reflector; the light beam that is not reflected by the character-shaped reflection surface enters the subsequent beam expander collimator 3 through the transmission area, is corrected to the original light beam specification through multi-directional beam expansion and collimation, is incident on the character-shaped reflection surface of the next level of mask plate 2, and is reflected again to form a character-shaped light beam with the same specification. The energy of each level of the character-shaped light beam is attenuated in steps and is sequentially superimposed on the working surface 4 to finally output a regular character-shaped high-power uniform light beam. At the same time, the inner ring diameter and the outer ring diameter of the character-shaped reflection surface can be customized as required to adapt to different size character-shaped processing requirements, and the regulation function of the reflector and the beam expander 31 is coordinated to ensure the shape accuracy of the character-shaped light spot.

[0041] Optionally, the laser emitter 1 is a semiconductor laser emitter 1. The semiconductor laser emitter 1 is suitable for high homogenization beam requirements, and the beam can be homogenized by integrating a homogenization module to achieve original homogenization. The output beam has excellent light intensity distribution uniformity, which provides a core guarantee for the precise shaping of the back-shaped reflecting surface and the output of the multi-wheel superimposed non-joint spot. There is no need to additionally add complex homogenization components, which simplifies the optical path structure. Moreover, the semiconductor laser emitter 1 has high power density and high electrical-optical conversion efficiency, and can stably output high-power beams to meet the device requirements. In combination with the stepwise energy recycling of multiple modules, the device's high-power output capability is further strengthened, and the low energy consumption feature can reduce the overall operating cost.

[0042] Generally, the laser beam emitted by the laser emitter 1 is rectangular or circular. Rectangular and circular are the conventional regular shapes of laser homogenization beams, and the light intensity distribution uniformity and contour stability are easier to control. The back-shaped reflecting surface can be precisely matched with the effective area of the beam to avoid reflection / transmission energy distribution deviation caused by irregular beam shape.

[0043] It should be noted that one of the masks 2 is inclined on the exit light path of the laser emitter 1, and the other mask 2 is inclined on the exit light path of the beam expander and collimator lens group 3, so that the two reflected special-shaped beams act on the same working surface 4. Both masks 2 are precisely calibrated and installed at a predetermined inclination angle. By adjusting the included angle between the mask 2 and the incident beam, the propagation direction of the reflected beam of the back-shaped reflecting surface is changed, so that the special-shaped beam reflected by the back-shaped reflecting surface of the first mask 2 and the special-shaped beam reflected by the back-shaped reflecting surface of the second mask 2 after correction by the beam expander and collimator lens group 3 can be precisely converged along the predetermined path and act on the same working surface 4, realizing effective superposition of the two special-shaped beams. At the same time, according to the actual working conditions, such as space limitation of the light path layout, insufficient inclination angle adjustment margin, etc., a reflecting mirror can be flexibly added as a supplementary light path guiding component. By adjusting the angle of the reflecting mirror, the propagation trajectories of the two special-shaped beams are further corrected to ensure that the two reflected beams can stably act on the same working surface 4 even under complex working conditions, thereby ensuring the accuracy of spot superposition.

[0044] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", and the like orientation or position relationship are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] In the description of the specification, the description of the terms "one embodiment", "an example", and the like refers to the specific features, structures, materials, or characteristics described in connection with the embodiment or example. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0046] In addition, it should be understood that, although the specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0047] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for the purpose of explaining the principles of the present application, and cannot be interpreted in any way as a limitation on the scope of protection of the present application. Based on the explanations here, those skilled in the art can think of other specific embodiments of the present application without creative labor, and these ways will fall within the scope of protection of the present application.

Claims

1. A device for generating irregularly shaped light spots, characterized in that, Including: A laser emitter (1), at least two masks (2), and a beam expander and collimator group (3); the laser emitter (1) is used to emit a homogenized laser beam, one of the masks (2) is arranged on the outgoing light path of the laser emitter (1), the mask (2) has a special-shaped reflecting surface (21) and a transmitting surface (22), part of the laser beam is reflected by the special-shaped reflecting surface (21) to form a special-shaped beam and acts on the working surface (4), and the remaining part of the laser beam is transmitted through the transmitting surface (22); the beam expander and collimator group (3) is arranged on the outgoing light path of the transmitting surface (22), one of the masks (2) is arranged on the outgoing light path of the beam expander and collimator group (3), and the laser beam after beam expansion and collimation forms a special-shaped beam through the special-shaped reflecting surface (21) and acts on the working surface (4) in a superimposed manner; Wherein, the size of the laser beam after beam expansion and collimation by the beam expander and collimator group (3) is equal to the size of the laser beam emitted by the laser emitter (1).

2. The shaped spot generating device according to claim 1, characterized in that The beam expander and collimator group (3) includes a beam expander (31) and a collimator (32), the beam expander (31) is arranged on the outgoing light path of the transmitting surface (22), the collimator (32) is arranged on the outgoing light path of the beam expander (31), and one of the masks (2) is arranged on the outgoing light path of the collimator (32).

3. The shaped spot generating device according to claim 1, wherein There are multiple beam expander and collimator groups (3), and masks (2) are respectively arranged on the incident light path and the outgoing light path of the beam expander and collimator group (3).

4. The shaped spot generating device according to claim 3, wherein It further includes a reflector (5), and the reflector (5) can be arranged on the reflecting light path of the special-shaped reflecting surface (21) so that all the special-shaped beams act on the same working surface (4).

5. The shaped spot generating device according to any of claims 1-4, characterized in that It further includes multiple beam expanders (31), and the beam expanders (31) are respectively arranged on the reflecting light paths of the special-shaped reflecting surfaces (21) one by one to magnify or reduce the special-shaped beams.

6. The shaped spot generating device according to any one of claims 1 to 4, wherein The special-shaped reflecting surface (2) is in a shape of a square frame with a hole in the middle.

7. The shaped spot generating device according to any one of claims 1 to 4, wherein The laser emitter (1) is a semiconductor laser emitter (1).

8. The shaped spot generating device according to any one of claims 1 to 4, wherein The laser beam emitted by the laser emitter (1) is rectangular or circular.

9. The shaped spot generating device according to any one of claims 1 to 4, wherein One of the masks (2) is inclined on the outgoing light path of the laser emitter (1), and one of the masks (2) is inclined on the outgoing light path of the beam expander and collimator group (3) so that the two reflected special-shaped beams both act on the same working surface (4). It should be noted that the translation in is a common way to describe the "回字形" in English, which means a square frame with a hole in the middle. If there are more specific requirements for this term, it can be adjusted accordingly.

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