Laser cutting device

Abstract

The invention discloses a laser cutting device which comprises a laser module used for emitting a reduced laser beam; the focusing assembly is used for further converging or focusing the shrunk laser beams; the heat dissipation assembly is used for dissipating heat of the laser module; and a housing; wherein the laser module comprises a laser set and a laser compression turning piece which is obliquely arranged on a light path of the laser set; the laser group comprises a plurality of first lasers and a plurality of second lasers; the laser compression turning piece comprises a first inclined plane and a second inclined plane which are arranged in parallel, first reflecting layers distributed at intervals are arranged on the first inclined plane, light of the first laser is reflected by the first reflecting layers and then is emitted to the focusing assembly, and a second reflecting layer is arranged on the second inclined plane; the light of the second laser is reflected by the second reflecting layer after passing through the first inclined plane, and is emitted to the focusing assembly through the gap or the edge of the first reflecting layer. The laser cutting device has the advantages of being high in unit area energy density, small in size, light in weight and the like.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and more particularly, to a laser cutting device. Background Art

[0002] Laser is another major invention since the 20th century following nuclear energy, computers, and semiconductors. It has the characteristics of extremely high energy, directional emission, and extremely high brightness, and is known as the "fastest knife", "most accurate ruler", and "brightest light". Currently, it has been applied to laser marking, laser welding, laser cutting, optical fiber communication, laser ranging, lidar, laser weapons, compact discs, laser vision correction, laser beauty, laser scanning, laser mosquito killers, LIF non-destructive testing technology, and so on. In particular, for laser cutting, the energy density per unit area of the laser is required to be relatively high. Currently, single lasers, multiple lasers only spliced and installed, or packaged lasers on the market basically cannot achieve the purpose of laser cutting. Therefore, it is necessary to further compress or beam down the laser to increase the energy density per unit area of the laser. In addition, to adapt to more application scenarios and improve the portability of the laser cutting device, the entire laser cutting device also needs to meet the requirement of miniaturization. Summary of the Invention

[0003] The present invention aims to overcome at least one defect of the above-mentioned prior art, and provides a laser cutting device, which has the advantages of high energy density per unit area, small volume, and light weight.

[0004] The technical solution adopted by the present invention is:

[0005] A laser cutting device, comprising:

[0006] A laser module for emitting a beam-down laser beam;

[0007] A focusing component for further converging or focusing the beam-down laser beam;

[0008] A heat dissipation component for dissipating heat from the laser module;

[0009] And a housing for accommodating the laser module, the focusing component, and / or the heat dissipation component;

[0010] Among them, the laser module includes a laser group and a laser compression turning member that is obliquely arranged on the optical path of the laser group; the laser group includes a plurality of first lasers and a plurality of second lasers; the laser compression turning member includes a first inclined surface and a second inclined surface arranged in parallel, and the first inclined surface is closer to the laser group. The first inclined surface is provided with first reflection layers distributed at intervals. The light of the first lasers is reflected by the first reflection layers and then shoots towards the focusing component. The second inclined surface is provided with a second reflection layer. The light of the second lasers passes through the first inclined surface, is refracted in the laser compression turning member, and then is reflected by the second reflection layer, and exits towards the focusing component through the gaps or edges of the first reflection layers.

[0011] In one implementation, the laser module further includes a copper plate. The laser group is arranged on the copper plate. The first lasers and the second lasers are integrally encapsulated. The optical axis intervals of any adjacent lasers on the copper plate are 0.5 mm - 2 mm.

[0012] In one implementation, the laser compression turning member is a single light-transmitting element in which the first inclined surface and the second inclined surface are integrally formed.

[0013] In one implementation, the laser module further includes a module housing. The laser group and the laser compression turning member are arranged in the module housing. A light passing hole is opened on the other side of the module housing that is obliquely opposite to the first inclined surface. The focusing component is arranged in the light passing hole or opposite to the light passing hole.

[0014] In one implementation, the focusing component includes a focusing lens and a lens sleeve for mounting the focusing lens. A first light-transmitting glass sheet is provided in the light passing hole and / or in the lens sleeve.

[0015] In one implementation, the first inclined surface includes a first region and a second region. The projections of the first region and the second region on the plane where the laser group is located completely cover the first lasers and the second lasers respectively, and the first region is located at one end of the first inclined surface away from the laser group; a plurality of the first reflection layers are arranged at intervals in the first region.

[0016] In one implementation, an anti-reflection layer is provided in the gap between the second region and the first reflection layers.

[0017] In one implementation, the thickness C of the laser compression turning member satisfies:

[0018] Among them, α is the incident angle α of the second laser incident on the second area, 30°≤α≤60°; A is the original spacing between the optical axes of the first second laser and the first first laser in the same direction; B is the optical axis distance between the first second laser and the first first laser after the light passes through the laser compression transition piece; n1 is the refractive index of the spatial environment in which the laser group is located, n2 is the refractive index of the laser compression transition piece; k is the error coefficient, 0.95≤k≤1.05.

[0019] In one embodiment, the heat dissipation assembly includes a heat sink disposed on the periphery of the laser module and / or a heat dissipation fan disposed on the side of the laser module away from the focusing assembly.

[0020] In one embodiment, the laser cutting device is further provided with an air jet assembly, which includes an air intake pipe for air intake and a nozzle for air exhaust, and the compressed laser beam is also emitted from the nozzle.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the laser cutting device of the present technical solution effectively realizes the turning and compression of the light beam of the laser module by setting a laser compression turning piece, and further converges or focuses the shrunken laser light beam through a focusing component, so that the energy density of the final emitted laser is extremely high, wherein the laser compression turning piece is not only easy to process and has controllable precision, but also only one laser compression turning piece is required to complete the turning and compression of the light beam, further simplifying the assembly process, and reducing the volume of the laser cutting device, achieving the purpose of miniaturization and lightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view of the laser cutting device in Example 1.

[0023] Figure 2 This is the assembly diagram of the laser cutting device in Example 1.

[0024] Figure 3 This is an assembly diagram of the laser cutting device of Example 1 from another perspective.

[0025] Figure 4 This is a partial exploded view of the laser cutting device in Example 1.

[0026] Figure 5 This is a partial assembly diagram of the laser cutting device in Example 1.

[0027] Figure 6 This is a schematic diagram of the structure of the laser group and laser compression transition piece of the laser module of Example 1.

[0028] Figure 7 This is a schematic diagram of the structure of the laser compression transition piece in Example 1.

[0029] Figure 8 Schematic optical path diagram of the laser module in Embodiment 1

[0030] Figure 9 Schematic optical path diagram of the laser module in another implementation manner

[0031] Figure 10 Structural diagram of the module housing in Embodiment 1

[0032] Figure 11 Structural diagram of the lens sleeve in Embodiment 1

[0033] Figure 12 Structural diagram of the compression ring in Embodiment 1

[0034] Figure 13 Original beam cross-sectional diagram of the laser module in Embodiment 1 of the present invention

[0035] Figure 14 Beam cross-sectional diagram of the laser module in Embodiment 1 of the present invention after beam reduction

[0036] Figure 15 Original beam energy distribution diagram of the laser module in Embodiment 1 of the present invention

[0037] Figure 16 Beam energy distribution diagram of the laser module in Embodiment 1 of the present invention after beam reduction

[0038] Explanation of reference numerals: 100, laser module; 10, laser unit; 11, first laser; 12, second laser; 20, laser compression and turning member; 21, first inclined surface; 21a, first region; 21b, second region; 211, first reflective layer; 22, second inclined surface; 221, second reflective layer; 30, copper plate; 40, module housing; 41, light passing hole; 411, second step surface; 42, observation window; 43, light transmissive sheet; 50, sealing ring; 200, focusing assembly; 210, focusing lens; 220, lens sleeve; 2201, first step surface; 300, heat dissipation assembly; 310, radiator; 320, cooling fan; 330, fan cover plate; 400, housing; 410, laser reflection sheet; 510, first light transmissive glass sheet; 520, second light transmissive glass sheet; 600, air jet assembly; 610, intake pipe; 611, pipe joint; 612, connecting pipe; 620, nozzle; 700, compression ring; 710, third step surface. Detailed implementation manners

[0039] The attached drawings of the present invention are only for illustrative purposes and should not be construed as limitations on the present invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. Example 1

[0040] As Figures 1 to 5 shown, this embodiment discloses a laser cutting device, including:

[0041] A laser module 100 for emitting a beam-reduced laser beam;

[0042] A focusing component 200 for further converging or focusing the beam-reduced laser beam;

[0043] A heat dissipation component 300 for dissipating heat from the laser module 100;

[0044] And a housing 400 for accommodating the laser module 100, the focusing component 200, and / or the heat dissipation component 300;

[0045] Wherein, the laser module 100 includes a laser group 10 and a laser compression turning member 20 disposed obliquely on the optical path of the laser group 10; As Figure 6 shown, the laser group 10 includes a plurality of first lasers 11 and a plurality of second lasers 12; The laser compression turning member 20 includes a first inclined surface 21 and a second inclined surface 22 arranged in parallel, and the first inclined surface 21 is closer to the laser group 10. As Figure 7 shown, the first inclined surface 21 is provided with first reflective layers 211 distributed at intervals. The light of the first lasers 11 is reflected by the first reflective layers 211 and then shoots towards the focusing component 200. The second inclined surface 22 is provided with second reflective layers 221. The light of the second lasers 12 passes through the first inclined surface 21, is refracted in the laser compression turning member 20, and then is reflected by the second reflective layers 221, and exits towards the focusing component 200 through the gaps or edges of the first reflective layers 211.

[0046] The laser cutting device of this embodiment realizes the beam reduction effect by turning and compressing the light of the laser group 10 through the laser compression turning member 20. Then, the focused component 200 further converges or focuses the reduced laser beam, so that the energy density of the emitted laser is very high, meeting the requirements of laser cutting. Compared with the existing laser beam reduction schemes on the market, this technical solution can realize the turning and compression of the laser beam of the laser group through a single laser compression turning member 20. The laser compression turning member 20 is easy to process, with controllable precision. And since only one laser compression turning member 20 is needed to complete the turning and compression of the beam, the assembly process is further simplified and the space volume of the laser cutting device is reduced. Specifically, when the laser cutting device of this embodiment is operating, the beam emitted by the first laser 11 is reflected and emitted by the first reflection layer 211, and at this time, the interval between the beams is the original interval; after the light of the second laser 12 irradiates the first inclined surface 21, it enters the laser compression turning member 20 and refracts, and then is reflected by the second reflection layer 221, and finally exits from the gap or edge of each first reflection layer 211, so that the beam projected by the second laser 12 is located between or at the edge of the beam projected by the first laser 11, that is, the lights of the first laser 11 and the second laser 12 are interspersed with each other after the action of the laser compression turning member 20, greatly reducing the interval between the beams and realizing effective beam reduction.

[0047] Further, as Figure 4 shown, the laser module 100 further includes a copper plate 30, the laser group 10 is arranged on the copper plate 30, the first laser 11 and the second laser 12 are integrally encapsulated, and the optical axis interval of any adjacent lasers on the copper plate 30 is 0.5 mm - 2 mm. That is, the first laser 11 and the second laser 12 of the present invention are integrally encapsulated, and the laser beams emitted by the laser group 10 itself are relatively close and have a high energy density.

[0048] Further, the laser compression turning member 20 is a single light-transmitting element formed by integrally molding the first inclined surface 21 and the second inclined surface 21. Further, for the convenience of processing and assembly, the laser compression turning member 20 of this embodiment is in the shape of a rectangular block, and in other embodiments, it can be designed into other shapes according to actual situations. More specifically, the laser compression turning member 20 is made of glass.

[0049] Further, as Figure 4 、 Figure 5 、 Figure 10As shown, the laser module in this embodiment further includes a module housing 40. The laser unit 10 and the laser compression and turning member 20 are disposed within the module housing 40. On the other side of the module housing 40 that is inclined relative to the first inclined surface 21, a light passing hole 41 is formed. The focusing assembly 200 is disposed within the light passing hole 41 or directly opposite the light passing hole 41. The module housing 40 serves to seal the laser unit 10, and the light passing hole 41 is used for emitting the beam-reduced laser beam. In this embodiment, the focusing assembly 200 is directly opposite the light passing hole 41, and the focusing assembly further converges or focuses the laser emerging from the light passing hole. In other embodiments, the focusing assembly may also be disposed within the light passing hole 41. Further, an observation window 42 is provided on the side surface of the module housing 40, and a light transmissive sheet 43 is disposed at the position of the observation window 42. Such a design facilitates observing the internal conditions of the laser module 100 and is convenient for subsequent maintenance of the laser module.

[0050] Further, as Figure 4 shown, the copper plate 30 is disposed at the bottom of the module housing 40 (the bottom of the module housing 40 itself is hollowed out). A sealing ring 50 is further provided between the copper plate 30 and the module housing 40, and the sealing ring 50 serves to further seal.

[0051] Further, the focusing assembly 200 includes a focusing lens 210 and a lens sleeve 220 for mounting the focusing lens 210. Specifically, as Figure 11 shown, in this embodiment, a first stepped surface 2201 is provided within the lens sleeve 220, and the focusing lens 210 is disposed on the first stepped surface 2201. In this embodiment, the lens sleeve 220 is threadedly connected to the light passing hole 41.

[0052] Refer to Figure 4 and Figure 10 again. In this embodiment, a first light transmissive glass sheet 510 is further provided within the light passing hole 41, and the first light transmissive glass sheet 510 serves to seal the laser module 100. Specifically, a second stepped surface 411 is provided within the light passing hole 41, and the first light transmissive glass sheet 510 is placed on the second stepped surface 411 and fixed by means of dotting. In other embodiments, the first light transmissive glass sheet 510 may also be disposed within the lens sleeve 220.

[0053] Further, in this embodiment, a second light transmissive glass sheet 520 is further provided behind the focusing lens 210 along the direction of the beam-reduced laser beam, and the second light transmissive glass sheet 520 serves to protect the focusing lens 210.

[0054] Further, a pressure ring 700 is also provided behind the focusing lens 210 along the direction of the converging laser beam. On the one hand, the pressure ring 700 is used to press the focusing lens 210 to fix the focusing lens 210, and on the other hand, it is used to carry the second transparent glass sheet 520. Specifically, as Figure 12 shown, a third stepped surface 710 is provided in the pressure ring 700, and the second transparent glass sheet 520 is arranged on the third stepped surface 710 and fixed by means of dispensing.

[0055] Further, an antireflection film is also provided on the focusing lens 210 and / or the first transparent glass sheet 510 and / or the second transparent glass sheet 520. The antireflection film can improve the transmittance of the laser and reduce the loss of laser energy. When the laser module group 10 is a blue laser, the antireflection film is a blue antireflection film.

[0056] Further, as Figure 7 shown, the first inclined surface 21 includes a first region 21a and a second region 21b. The projections of the first region 21a and the second region 21b on the plane where the laser module group 10 is located completely cover the first laser 11 and the second laser 12 respectively, and the first region 21a is located at one end of the first inclined surface 21 away from the laser module group 10; a plurality of the first reflective layers 211 are spaced in the first region 21a.

[0057] Further, an antireflection layer 212 is provided in the gap between the second region 21b and the first reflective layer 211. The antireflection layer 212 is an antireflection film. The design of the antireflection layer can increase the laser transmittance and enhance the light effect.

[0058] As Figure 6 、 Figure 8 shown, in this embodiment, the laser module 10 includes four lasers arranged at equal intervals as an example, two of which are the first lasers 11 (the first two from the right in the figure), and two are the second lasers 12 (the first two from the left in the figure). As an example, the two second lasers 12 first pass through the laser compression and turning member 20, are refracted and then reflected and emitted, and the two first lasers 11 are directly reflected and emitted through the laser compression and turning member 20. A is the original distance between the optical axes of the first second laser 12 (corresponding to the first laser from left to right in the figure) and the first first laser 11 (corresponding to the third laser from left to right in the figure) from left to right, and B is the optical axis distance between the first second laser 12 and the first first laser 11 after the light passes through the laser compression and turning member 20. β is the refraction angle of the second laser 12 in the laser compression and turning member 20 after it is incident on the second region 21b.

[0059] From the law of refraction n1sinα = n2sinβ

[0060] It can be obtained that: Therefore, the thickness C of the laser compression turning part 20 is: That is:

[0061] where α is the incident angle α of the second laser into the second region, 30° ≤ α ≤ 60°; A is the original distance between the optical axes of the first second laser 12 and the first first laser 11 in the same direction; B is the distance between the optical axes of the first second laser 12 and the first first laser 11 after passing through the laser compression turning part 20; n1 is the refractive index of the space environment where the laser group 10 is located, and n2 is the refractive index of the laser compression turning part 20; k is the error coefficient, 0.95 ≤ k ≤ 1.05. The range of the error coefficient k is more preferably 0.98 ≤ k ≤ 1.02, with smaller errors, better beam shrinking effect, and more uniform outgoing beam.

[0062] In order to make the beam uniform and facilitate assembly and processing, in this embodiment, the number of the first lasers 11 is equal to the number of the second lasers 12, and the lasers are arranged at equal distances. That is, the beams emitted by the first lasers 11 are the same as the beams emitted by the second lasers 12, and the finally outgoing beam is the interlaced outgoing of the beams of the first lasers 11 and the second lasers 12. In other embodiments, the number of the first laser and the second laser may differ by 1.

[0063] As Figure 13 、 Figure 14 shown, it is a schematic diagram of the cross-section of the laser beam obtained by simulating with the optical simulation software lighttools, where Figure 13 is the original cross-section diagram of the beam of the laser module 10, Figure 9 is the cross-section diagram of the beam after the action of the laser compression turning part 20, that is, the cross-section diagram after beam shrinking. By comparison, it can be seen that the width of the beam of a single laser itself does not change after the action of the laser compression turning part 20, that is, the beam performance of the laser itself is not changed, but the beam spacing between adjacent lasers is significantly reduced.

[0064] As Figure 15 、 Figure 6 shown are the beam energy distribution diagrams of the laser module 10 before and after beam shrinking obtained by simulating with the optical simulation software respectively. It can also be seen from the figure that the width of the beam of a single laser itself does not change, but the beam spacing between adjacent lasers is significantly reduced.

[0065] In other embodiments, the number of the first laser and the second laser of the laser module 10 may also be other numbers, such as Figure 9As shown, the numbers of the first laser and the second laser are 3 each. In actual application, the number of lasers in the laser module 10 can be set according to the power required for actual laser cutting, and will not be listed one by one here.

[0066] Further, as Figure 1 shown, the heat dissipation component 300 includes a radiator 310 disposed on the outer periphery of the laser module and a heat dissipation fan 320 disposed on the side of the laser module 10 away from the focusing component 200. More specifically, a cavity for accommodating the laser module 100 is provided in the middle of the radiator 310 shown, and a plurality of heat dissipation fins are provided on the outer periphery. More specifically, the radiator 310 is a drawn aluminum part. Further, the heat dissipation component 300 further includes a fan cover plate 330, and the fan cover plate 330 is disposed on the side of the heat dissipation fan 320 away from the laser module 100 for protection and aesthetics.

[0067] Further, the laser cutting device is further provided with a gas jetting component 600. The gas jetting component 600 includes an air inlet pipe 610 for air intake and a nozzle 620 for air outlet, and the compressed laser beam also exits from the nozzle 620. The setting of the gas jetting component 600 can make the air pressure inside the laser cutting device greater than the outside, prevent dust or impurities from entering the laser cutting device during laser cutting, and ensure the service life of the laser cutting device. More specifically, the air inlet pipe 610 includes a pipe joint 611 and a connecting pipe 612, and the connecting pipe 612 connects the pipe joint 611 and the nozzle 620.

[0068] Further, a laser reflecting sheet 410 for reflecting laser is further provided on the upper shell of the shell 400 and at a position close to the side where the gas jetting component 600 is located. When the laser group is a blue laser group, the laser reflecting sheet 410 is an anti-blue lens to avoid laser glare.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A laser cutting device, characterized in that, include: A laser module, used for emitting a reduced beam laser beam; A focusing assembly, used to further converge or focus the reduced laser beam; A heat dissipation component, used for dissipating heat from the laser module; and a housing for accommodating a laser module, a focusing assembly and / or a heat dissipation assembly; Wherein, the laser module includes a laser group and a laser compression transition member obliquely arranged on the optical path of the laser group; the laser group includes a plurality of first lasers and a plurality of second lasers; the laser compression transition member includes a first inclined surface and a second inclined surface arranged in parallel, and the first inclined surface is closer to the laser group, and a first reflective layer distributed at intervals is arranged on the first inclined surface, and the light of the first laser is reflected by the first reflective layer and then emitted to the focusing component, and a second reflective layer is arranged on the second inclined surface, and the light of the second laser passes through the first inclined surface and is refracted in the laser compression transition member and then reflected by the second reflective layer, and is emitted to the focusing component through the gap or edge of the first reflective layer.

2. The laser cutting device according to claim 1, wherein The laser module further comprises a copper plate, the laser group is arranged on the copper plate, the first laser and the second laser are packaged as one, and the optical axis interval of any adjacent lasers on the copper plate is 0.5 mm-2 mm.

3. The laser cutting device according to claim 1, wherein The laser compression transition piece is a single light-transmitting element formed integrally with a first inclined surface and a second inclined surface.

4. The laser cutting device according to claim 1, characterized in that, The laser module also includes a module shell, the laser group and the laser compression transition piece are arranged in the module shell, a light hole is opened on the other side of the module shell which is obliquely opposite to the first inclined surface, and the focusing assembly is arranged in the light hole or facing the light hole.

5. The laser cutting device according to claim 4, characterized in that, The focusing assembly comprises a focusing lens and a lens sleeve for mounting the focusing lens, and a first light-transmitting glass sheet is arranged in the light-through hole and / or in the lens sleeve.

6. The laser cutting device according to claim 1, wherein, The first inclined surface includes a first area and a second area, and the projections of the first area and the second area on the plane where the laser group is located completely cover the first laser and the second laser respectively, and the first area is located at an end of the first inclined surface away from the laser group; a plurality of the first reflective layers are arranged at intervals in the first area.

7. The laser cutting device according to claim 6, characterized in that, An anti-reflection layer is provided in the gap between the second region and the first reflective layer.

8. The laser cutting device according to claim 6, characterized in that, The thickness C of the laser compression transition piece satisfies: Among them, α is the incident angle α of the second laser incident on the second area, 30°≤α≤60°; A is the original spacing between the optical axes of the first second laser and the first first laser in the same direction; B is the optical axis distance between the first second laser and the first first laser after the light passes through the laser compression transition piece; n1 is the refractive index of the spatial environment in which the laser group is located, n2 is the refractive index of the laser compression transition piece; k is the error coefficient, 0.95≤k≤1.

05.

9. The laser cutting device according to claim 1, wherein, The heat dissipation component includes a radiator arranged on the periphery of the laser module and / or a heat dissipation fan arranged on the side of the laser module away from the focusing component.

10. The laser cutting device according to any one of claims 1 to 9, characterized in that, The laser cutting device is also provided with an air jet assembly, which includes an air intake pipe for air intake and a nozzle for air exhaust, and the compressed laser beam also exits from the nozzle.

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