Laser processing device
By combining a laser module, a focus matching module, and a vision module, the laser focus position is adjusted in real time, solving the problem of focus offset on workpieces with varying shapes in laser processing devices, improving production quality and reducing labor costs.
Patent Information
- Application Number
- CN202423124961.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing laser processing equipment struggles to quickly and accurately adjust the laser focus position when processing workpieces with varying shapes, leading to processing abnormalities and impacting production quality.
It employs a combination of a laser module, a focus comparison module, a focus projection module, and a vision module. By projecting light from the laser beam and LED point light sources, the laser focus position is adjusted in real time, and the vision module obtains feedback on the clarity of the comparison image to automatically adjust the focus.
It enables rapid and precise adjustment of the laser focus position, avoids processing abnormalities, improves production quality, and reduces manual debugging time and costs.
Smart Images
Figure CN223776235U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of laser processing, in particular to a laser processing device. BACKGROUND
[0002] With the improvement of production technology, laser processing technology is used more and more widely, especially in the manufacturing of intelligent mobile devices, automobiles, lithium batteries, new energy, furniture hardware, etc. For example, laser welding / cutting devices are used to manufacture mobile phone shells. However, due to the variable shape of some workpieces (for example, a mobile phone shell includes multiple stepped surfaces), the distance between the laser processing device and the workpiece changes in real time during processing, which easily causes the shift of the laser focal point position, and further causes the quality of the workpiece to be abnormal, thereby affecting the production quality.
[0003] The conventional solution often needs manual judgment of the laser focal point position, and manual adjustment of the distance between the laser processing device and the workpiece to adapt to the shape of the workpiece; the conventional solution cannot quickly and accurately adjust the laser focal point under the premise of saving cost. CONTENT OF THE INVENTION
[0004] In view of the above, it is necessary to provide a laser processing device that can quickly and accurately determine the focal point position of the laser working process.
[0005] A laser processing device, comprising:
[0006] A laser module for emitting a laser beam;
[0007] A focal point contrast module comprising an LED point light source and a pattern element provided with a contrast pattern;
[0008] A focusing projection module, which is respectively connected to the laser module and the focal point contrast module, the laser beam is emitted to a target area after passing through the focusing projection module and forms a laser spot, and the light emitted by the LED point light source is emitted to the target area after passing through the pattern element and the focusing projection module in turn, so that the contrast pattern is projected to the target area; and
[0009] A vision module connected to the focusing projection module, the vision module is used to acquire the scene in which the laser spot is located in the projection of the contrast pattern.
[0010] The laser processing device provided by the embodiment of the present application is provided with a laser module, a focal point comparison module, a focusing projection module and a vision module. The laser beam emitted by the laser module is emitted to a target area after passing through the focusing projection module and forms a laser spot. The light emitted by the LED point light source of the focal point comparison module is emitted to the target area after sequentially passing through the pattern element and the focusing projection module, so that the comparison pattern is projected to the target area. The vision module is used to obtain the scene in which the laser spot is located in the projection of the comparison pattern. The focal point position of the laser working process can be quickly and accurately determined according to the scene in the projection of the comparison pattern. This is beneficial to avoiding processing abnormalities caused by the deviation of the focal point position of the laser and improving the production quality of the production process. Compared with manually judging the focal point position of the laser working process, this is beneficial to reducing the debugging time and reducing the labor cost.
[0011] In an embodiment, the focusing projection module comprises a first half-reflecting half-transmitting lens and a second half-reflecting half-transmitting lens arranged at intervals, the first half-reflecting half-transmitting lens is connected with the laser module, and the second half-reflecting half-transmitting lens is connected with the focal point comparison module.
[0012] The first half-reflecting half-transmitting lens is used for reflecting the laser beam into the focusing projection module for focusing. The second half-reflecting half-transmitting lens is used for reflecting and guiding the light emitted by the LED point light source into the focusing projection module. The second half-reflecting half-transmitting lens is also used for transmitting the light emitted by the LED point light source reflected from the target area back to the vision module.
[0013] In an embodiment, the focusing projection module further comprises a galvanometer assembly, a focusing assembly and a field lens element arranged in sequence.
[0014] The galvanometer assembly is connected with the first half-reflecting half-transmitting lens. The galvanometer assembly is used for reflecting the laser beam to the focusing assembly. The laser beam sequentially passes through the focusing assembly and the field lens element and is incident to the target area to form the laser spot.
[0015] In an embodiment, the focusing projection module comprises a first half-reflecting half-transmitting lens, the first half-reflecting half-transmitting lens is connected with the laser module and the focal point comparison module respectively.
[0016] The first half-reflecting half-transmitting lens is used for reflecting the laser beam into the focusing projection module for focusing. The first half-reflecting half-transmitting lens is also used for transmitting the light emitted by the LED point light source into the focusing projection module.
[0017] In an embodiment, the laser processing device further comprises a transmissive-refl ective element, the transmissive-refl ective element is respectively connected with the focusing projection module and the visual module; the transmissive-refl ective element comprises a first surface and a second surface opposite to the first surface; the first surface is connected with the focusing projection module;
[0018] The first surface is coated with a stacked anti-refl ection fi lm and a transmissive-refl ective fi lm, the anti-refl ection fi lm is used to increase the reflectivity of the laser beam, and the transmissive-refl ective fi lm is used to refl ect and transmit the light emitted by the LED point light source;
[0019] The second surface is coated with an anti-refl ection fi lm, which is used to increase the transmittance of the light emitted by the LED point light source refl ecting from the target area to the visual module.
[0020] In an embodiment, the focusing projection module further comprises a galvanometer assembly, a focusing assembly and a field lens element arranged in sequence;
[0021] The galvanometer assembly is connected with the first half-refl ective half-transmissive lens, the galvanometer assembly is used to refl ect the laser beam to the focusing assembly, the laser beam passes through the focusing assembly and the field lens element in sequence and then is incident to the transmissive-refl ective element, and the transmissive-refl ective element refl ects the laser beam to the target area and forms the laser spot.
[0022] In an embodiment, the focal point contrast module comprises a first projection lens, a second projection lens and a third projection lens arranged in sequence, and the first projection lens is connected with the pattern element;
[0023] The first projection lens, the second projection lens and the third projection lens are integrally movable relative to the pattern element along the light path direction of the light emitted by the LED point light source, so as to adjust the divergence angle of the light emitted by the LED point light source transmitted through the third projection lens.
[0024] In an embodiment, the first projection lens is a negative meniscus lens, the second projection lens is a double convex lens, and the third projection lens is a crescent lens.
[0025] In an embodiment, the laser module comprises a laser light source for emitting the laser beam and a first processing lens, a second processing lens and a third processing lens arranged in sequence;
[0026] The laser light source is connected with the first processing lens, and the first processing lens is movable relative to the laser light source, so as to change the focal point position of the laser incident to the target area.
[0027] In an embodiment, the first processing lens is a plano-concave lens, the second processing lens is a crescent lens, and the third processing lens is a plano-convex lens. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 Fig. 1 is a schematic diagram of a laser processing device according to an embodiment of the present application.
[0029] Figure 2 Fig. 2 is a schematic diagram of a laser module according to an embodiment of the present application.
[0030] Figure 3 Fig. 3 is a schematic diagram of a target area according to an embodiment of the present application.
[0031] Figure 4 Fig. 4 is a schematic diagram of a pattern element according to an embodiment of the present application.
[0032] Figure 5 Fig. 5 is a schematic diagram of an optical path of a focus contrast module according to an embodiment of the present application.
[0033] Figure 6 Fig. 6 is a schematic diagram of an optical path of a vision module according to an embodiment of the present application.
[0034] Figure 7 Fig. 7 is a schematic diagram of a laser processing device according to another embodiment of the present application.
[0035] Figure 8 Fig. 8 is a schematic diagram of an optical path of a transmissive-reflective element according to another embodiment of the present application.
[0036] MAIN ELEMENT SYMBOL EXPLANATION
[0037] Laser processing device: 100a, 100b
[0038] Laser module: 1
[0039] Laser light source: 10
[0040] First processing lens: 11
[0041] Second processing lens: 12
[0042] Third processing lens: 13
[0043] Focus contrast module: 2
[0044] LED point light source: 21
[0045] Pattern element: 22
[0046] Light-transmitting portion: 221
[0047] Non-light-transmitting portion: 222
[0048] First projection lens: 231
[0049] Second projection lens: 232
[0050] Third projection lens: 233
[0051] Focusing projection module: 3
[0052] First half reflective half-transmissive lens: 31
[0053] Second half reflective half-transmissive lens: 32
[0054] Galvanometer assembly: 33
[0055] Focusing assembly: 331
[0056] Lens: 34
[0057] Field lens element: 35
[0058] Visual module: 4
[0059] Transflective element: 5
[0060] First surface: 51
[0061] Second surface: 52
[0062] Laser beam: L1
[0063] Light rays emitted by the LED point light source: L2
[0064] Target area: S1
[0065] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0066] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments of the present application.
[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0068] In order to further clarify the technical means and effects taken by the present application to achieve the predetermined purpose, the following will be described in detail in conjunction with the drawings and the preferred embodiments.
[0069] Embodiment One
[0070] Please refer to Figure 1 The laser processing device 100a of the embodiment one of the present application comprises a laser module 1, a focal point comparison module 2, a focusing projection module 3, and a visual module 4.
[0071] The laser module 1 is configured to emit a laser beam L1. The focal point contrast module 2 is configured to emit a light ray L2. The laser beam L1 is emitted to the target region S1 after passing through the focusing projection module 3 and forms a laser spot. The light ray L2 emitted by the focal point contrast module 2 is emitted to the target region S1 after passing through the focusing projection module 3, so as to project a contrast pattern to the target region S1. The visual module 4 is configured to acquire a scene in which the laser spot is located in the projection of the contrast pattern.
[0072] Please refer to Figure 1 and Figure 2 The laser module 1 includes a laser light source 10, a first processing lens 11, a second processing lens 12, and a third processing lens 13.
[0073] The laser light source 10 is configured to emit a laser beam L1. The laser light source 10 can be any one of a gas laser, a solid-state laser, a semiconductor laser, a liquid laser, a chemical laser, and a free electron laser, which is not limited in the present application. The first processing lens 11, the second processing lens 12, and the third processing lens 13 are sequentially arranged on the light emitting side of the laser light source 10, and the laser light source 10 is in butt joint with the first processing lens 11.
[0074] In the present embodiment, the first processing lens 11 is a plano-concave lens, the second processing lens 12 is a crescent-shaped lens, and the third processing lens 13 is a plano-convex lens. In other embodiments, the first processing lens 11 can also be any one of a plano-convex lens, a meniscus lens, a double-concave lens, and a double-convex lens; the third processing lens 13 can also be any one of a plano-concave lens, a meniscus lens, a double-concave lens, and a double-convex lens, which is not limited in the present application.
[0075] The first processing lens 11 is movable relative to the laser light source 10 to change the focal point position of the laser light incident to the target region S1. Specifically, when the first processing lens 11 moves relative to the laser light source 10, the relative distance between the first processing lens 11, the second processing lens 12, and the third processing lens 13 is changed, and the focal point position of the laser beam L1 emitted to the target region S1 after passing through the focusing projection module 3 is also changed, that is, the size of the laser spot formed by the laser beam L1 emitted to the target region S1 after passing through the focusing projection module 3 is changed.
[0076] Please refer to Figure 3 In the present embodiment, the target region S1 is a to-be-processed surface of a to-be-processed piece, for example, when the to-be-processed piece is a mobile phone shell, the to-be-processed surface is a tiny step surface on the mobile phone shell; in other embodiments, the target region S1 can also be a man-made processing region, which is not limited in the present application.
[0077] Please refer to Figure 1 andFigure 4 The focal point contrast module 2 comprises an LED point light source 21 and a pattern element 22 provided with a contrast pattern. The pattern element 22 comprises a light-transmitting part 221 for transmitting the light rays L2 emitted from the LED point light source and a non-light-transmitting part 222 for shielding the light rays L2 emitted from the LED point light source. The light-transmitting part 221 has the same shape as the contrast pattern, which is a cross-shaped coordinate in this embodiment. In other embodiments, the contrast pattern can also be a triangular shape, a rectangular shape, a circular shape, a polygonal shape or an irregular shape, which is not limited in the present application.
[0078] In this embodiment, the pattern element 22 in the focal point contrast module 2 is a film; in other embodiments, the pattern element 22 can also be a mask, as long as it can have the light-transmitting part 221 for transmitting the light rays L2 emitted from the LED point light source and the non-light-transmitting part 222 for shielding the light rays L2 emitted from the LED point light source, which is not limited in the present application.
[0079] By arranging the pattern element 22, the light rays L2 emitted from the LED point light source can be sequentially transmitted through the pattern element 22 and the focusing projection module 3 and then emitted to the target area S1, so that the light rays L2 emitted from the LED point light source can form the same pattern as the contrast pattern in the target area S1, thereby facilitating the judgment of the scene in which the laser spot is located in the projection of the contrast pattern according to the clarity of the contrast pattern formed in the target area S1 by the visual module 4.
[0080] Please refer to Figure 1 and Figure 5 The focal point contrast module 2 further comprises a first projection lens 231, a second projection lens 232 and a third projection lens 233 arranged in sequence. The first projection lens 231 is in abutment with the pattern element 22. The second projection lens 232 is located between the first projection lens 231 and the third projection lens 233. The first projection lens 231, the second projection lens 232 and the third projection lens 233 as a whole are movable relative to the pattern element 22 along the light path direction of the light rays L2 emitted from the LED point light source, so as to adjust the divergence angle of the light rays L2 emitted from the LED point light source transmitted through the third projection lens 233.
[0081] The first projection lens 231 is a crescent-shaped lens, and the third projection lens 233 is a crescent-shaped lens. Specifically, the first projection lens 231 is a negative crescent lens, and the third projection lens 233 is a positive crescent lens. In this embodiment, the second projection lens 232 is a biconvex lens; in other embodiments, the second projection lens 232 can also be any one of a biconcave lens, a meniscus lens and a plano-convex lens, which is not limited in the present application.
[0082] By setting the first projection lens 231, the second projection lens 232 and the third projection lens 233, the first projection lens 231, the second projection lens 232 and the third projection lens 233 as a whole can move along the light path direction of the light ray L2 emitted by the LED point light source relative to the pattern element 22, so that the divergence angle of the light ray L2 emitted by the LED point light source and passing through the third projection lens 233 can be adjusted, the definition of the contrast pattern formed by the light ray L2 emitted by the LED point light source on the target area S1 can be adjusted, and the position of the projected contrast pattern and the focal point position of the laser beam L1 coincide; in addition, by setting the first projection lens 231, the second projection lens 232 and the third projection lens 233 as a whole can move along the light path direction of the light ray L2 emitted by the LED point light source relative to the pattern element 22, it is beneficial to reduce the spherical aberration, coma and astigmatism generated by the light ray emitted from the third projection lens 233; it is beneficial to reduce the assembly error generated when the focusing projection module 3 is assembled, and it is beneficial to increase the adaptability of the focusing projection module 3 in the laser processing device 100a.
[0083] Please refer to Figure 1 and Figure 6 , the focusing projection module 3 is respectively connected with the laser module 1 and the focal point contrast module 2. The focusing projection module 3 comprises a first half-reflection half-transmission lens 31 and a second half-reflection half-transmission lens 32 arranged at intervals. The first half-reflection half-transmission lens 31 and the second half-reflection half-transmission lens 32 are connected.
[0084] The first half-reflection half-transmission lens 31 is connected with the laser module 1, and the first half-reflection half-transmission lens 31 is used to reflect the laser beam L1 into the focusing projection module 3 for focusing. The first half-reflection half-transmission lens 31 is also used to transmit the light ray emitted from the third projection lens 233 of the focal point contrast module 2.
[0085] The second half-reflection half-transmission lens 32 is connected with the focal point contrast module 2. The second half-reflection half-transmission lens 32 is used to reflect and guide the light ray L2 emitted by the LED point light source into the focusing projection module 3, and the second half-reflection half-transmission lens 32 is also used to transmit the light ray L2 emitted by the LED point light source reflected back to the visual module 4 from the target area S1. The focusing projection module 3 further comprises a galvanometer assembly 33, a focusing assembly 331 and a field lens element 35 arranged in sequence. The galvanometer assembly 33 is connected with the first half-reflection half-transmission lens 31, and the galvanometer assembly 33 is used to reflect the laser beam L1 to the focusing assembly 331. The focusing assembly 331 comprises a plurality of lenses 34 arranged in sequence. In this embodiment, the focal lengths of the plurality of lenses 34 are different; in other embodiments, the focal lengths of the plurality of lenses 34 can also be the same, which is not limited in the present application. The field lens element 35 is used to receive and project the laser beam L1 to the target area S1. The galvanometer assembly 33 and the field lens element 35 are also used to adjust the emission angle of the laser beam L1 to change the position of the laser spot on the target area S1.
[0086] The visual module 4 is connected with the focusing projection module 3. Specifically, the visual module 4 is connected with the second half-reflection half-transmission lens 32 in the focusing projection module 3. In the embodiment, the visual module 4 includes a charge coupled device (CCD) for acquiring a scene in the projection of the contrast pattern, and in other embodiments, the visual module 4 can also include a complementary metal oxide semiconductor (CMOS), which is not limited in the application.
[0087] The visual module 4 is also used for analyzing the scene in the projection of the contrast pattern, i.e., analyzing the definition of the contrast pattern projection, so as to determine the focal point position of the laser beam L1 according to the definition of the contrast pattern projection; and changing the distance between the first projection lens 231, the second projection lens 232 and the third projection lens 233 and the light path direction of the light L2 emitted by the LED point light source relative to the pattern element 22 according to the definition of the contrast pattern projection, so as to change the definition of the contrast pattern projection to confirm the focal point position of the laser beam L1. The visual module 4 is also used for feeding back the position of the focal point of the laser beam L1 relative to the laser module 1 to the laser module 1, so as to control the moving distance of the first machining lens 11 relative to the laser light source 10, for example, the first machining lens 11 can be moved relative to the laser light source 10 by a motor, so that the distance between the laser processing device 100a and the workpiece to be processed can be automatically adjusted to adapt to the shape of the workpiece to be processed, thereby adapting to the shapes of different workpieces to be processed, which is beneficial to avoid processing abnormalities caused by the deviation of the focal point position of the laser, and is beneficial to improve the production quality of the production process.
[0088] The laser processing device 100a provided by the embodiment one of the application is provided with the laser module 1, the focal point contrast module 2, the focusing projection module 3 and the visual module 4; the laser beam L1 emitted by the laser module 1 is emitted to the target area S1 and forms a laser spot after passing through the focusing projection module 3, and the light L2 emitted by the LED point light source of the focal point contrast module 2 is emitted to the target area S1 after passing through the pattern element 22 and the focusing projection module 3 in turn, so that the contrast pattern is projected to the target area S1, and the visual module 4 is used to acquire a scene in which the laser spot is located in the projection of the contrast pattern, so that the focal point position of the laser working process can be quickly and accurately determined according to the scene in the projection of the contrast pattern, which is beneficial to avoid processing abnormalities caused by the deviation of the focal point position of the laser, and is beneficial to improve the production quality of the production process; compared with manually determining the focal point position of the laser working process, it is beneficial to reduce the debugging time and reduce the labor cost.
[0089] Embodiment two
[0090] Please refer to Figure 7 and Figure 8The laser processing device 100b of the second embodiment of the present application comprises a laser module 1, a focal point contrast module 2, a focusing projection module 3, a visual module 4, and a transmissive-refl ective element 5. The laser module 1 is used for emitting a laser beam L1. The laser beam L1 is emitted to a target area S1 after passing through the focusing projection module 3 and forms a laser spot. The light rays L2 emitted by the LED point light source pass through the pattern element 22 and the focusing projection module 3 in turn and are emitted to the target area S1, so as to project a contrast pattern to the target area S1. The visual module 4 is used for acquiring a scene in which the laser spot is located in the projection of the contrast pattern.
[0091] The difference between the second embodiment and the first embodiment of the present application is that the focusing projection module 3 of the second embodiment of the present application only comprises a first half-refl ective half-transmissive lens 31, and the first half-refl ective half-transmissive lens 31 is respectively connected with the laser module 1 and the focal point contrast module 2. The first half-refl ective half-transmissive lens 31 is used for reflecting the laser beam L1 into the focusing projection module 3 for focusing, and is also used for transmitting the light rays L2 emitted by the LED point light source into the focusing projection module 3.
[0092] The transmissive-refl ective element 5 is connected with the focusing projection module 3 and the visual module 4 respectively. The transmissive-refl ective element 5 comprises a first surface 51 and a second surface 52 opposite to the first surface 51; the first surface 51 is connected with the focusing projection module 3.
[0093] The first surface 51 is coated with a laminated antirefl ective film and a transmissive-refl ective film. The antirefl ective film is used for increasing the reflectivity of the laser beam L1, and the transmissive-refl ective film is used for refl ecting and transmitting the light rays L2 emitted by the LED point light source. In the present embodiment, the transmissive-refl ective film is arranged on the side of the first surface 51 close to the visual module 4, and the antirefl ective film is arranged on the side of the first surface 51 away from the visual module 4; in other embodiments, the transmissive-refl ective film can also be arranged on the side of the first surface 51 away from the visual module 4; the antirefl ective film can also be arranged on the side of the first surface 51 close to the visual module 4, which is not limited in the present application. For example, when the wavelength of the light rays L2 emitted by the LED point light source is 405 nm and the wavelength of the laser beam L1 is 1064 nm, the antirefl ective film can be a film layer with high reflectivity to the light rays of 1064 nm, and the transmissive-refl ective film can be a film layer with 50% reflectivity and 50% transmittance to the light rays of 405 nm, which is not limited in the present application.
[0094] The second surface 52 is coated with an antirefl ective film, which is used for increasing the transmittance of the light rays L2 emitted by the LED point light source refl ected from the target area S1 to the visual module 4. For example, when the wavelength of the light rays L2 emitted by the LED point light source is 405 nm, the antirefl ective film can be a film layer with high transmittance to the light rays of 405 nm.
[0095] The galvanometer assembly 33 of the focusing projection module 3 is connected to the first half-reflection half-transmission lens 31, the galvanometer assembly 33 is used to reflect the laser beam L1 to the focusing assembly 331, the laser beam L1 is sequentially incident to the field lens element 35 after passing through the focusing assembly 331 and the field lens element 35, and the laser beam L1 is reflected to the target area S1 by the transflective element 5 and forms a laser spot.
[0096] The visual module 4 is further used to analyze the scene in which the laser spot is located in the projection of the contrast pattern, that is, to analyze the definition of the contrast pattern projection, so as to determine the focal point position of the laser beam L1 according to the definition of the contrast pattern projection; and the distance between the light path direction of the light L2 emitted by the first projection lens 231, the second projection lens 232 and the third projection lens 233 as a whole relative to the pattern element 22 is changed according to the definition of the contrast pattern projection, so as to change the definition of the contrast pattern projection, so as to confirm the focal point position of the laser beam L1. The visual module 4 is also used to feed back the position of the focal point of the laser beam L1 relative to the laser module 1 to the laser module 1, so as to control the moving distance of the first machining lens 11 relative to the laser light source 10, for example, the first machining lens 11 can be moved relative to the laser light source 10 by a motor, so that the distance between the laser processing device 100b and the workpiece to be processed can be automatically adjusted to adapt to the shape of the workpiece to be processed, and then the shape of different workpieces to be processed can be adapted, which is beneficial to avoid processing abnormalities caused by the deviation of the focal point position of the laser, and is beneficial to improve the production quality of the production process.
[0097] The laser processing device 100b provided by the second embodiment of the present application is provided with the laser module 1, the focal point contrast module 2, the focusing projection module 3 and the visual module 4; the laser beam L1 emitted by the laser module 1 is emitted to the target area S1 and forms a laser spot after passing through the focusing projection module 3, the light L2 emitted by the LED point light source of the focal point contrast module 2 is emitted to the target area S1 after sequentially passing through the pattern element 22 and the focusing projection module 3, so that the contrast pattern is projected to the target area S1, and the visual module 4 is further provided to obtain the scene in which the laser spot is located in the projection of the contrast pattern, so that the focal point position of the laser working process can be quickly and accurately determined according to the scene in the projection of the contrast pattern, which is beneficial to avoid processing abnormalities caused by the deviation of the focal point position of the laser, and is beneficial to improve the production quality of the production process; compared with manually determining the focal point position of the laser working process, it is beneficial to reduce the debugging time and reduce the labor cost.
[0098] Those skilled in the art should understand that the above embodiments are only used to illustrate the present application, and are not used as a limitation of the present application, and any appropriate changes and variations made to the above embodiments within the spirit and principles of the present application fall within the scope of the present application.
Claims
1. A laser processing apparatus characterized by comprising: The laser processing device comprises: a laser module for emitting a laser beam; a focal point contrast module comprising an LED point light source and a pattern element provided with a contrast pattern; a focusing projection module which is respectively connected with the laser module and the focal point contrast module, wherein the laser beam is emitted to a target area and forms a laser spot after passing through the focusing projection module, and the light emitted by the LED point light source is emitted to the target area after sequentially passing through the pattern element and the focusing projection module, so that the contrast pattern is projected to the target area; and a vision module which is connected with the focusing projection module, and is used for acquiring a scene in which the laser spot is located in the projection of the contrast pattern.
2. The laser processing apparatus according to claim 1, wherein The focusing projection module comprises a first half-reflection half-transmission lens and a second half-reflection half-transmission lens which are arranged at intervals, the first half-reflection half-transmission lens is connected with the laser module, and the second half-reflection half-transmission lens is connected with the focal point contrast module; the first half-reflection half-transmission lens is used for reflecting the laser beam into the focusing projection module for focusing; the second half-reflection half-transmission lens is used for reflecting and guiding the light emitted by the LED point light source into the focusing projection module, and is also used for transmitting the light emitted by the LED point light source which is reflected from the target area back to the vision module.
3. The laser processing apparatus according to claim 2, wherein The focusing projection module further comprises a galvanometer assembly, a focusing assembly and a field lens element which are arranged in sequence; the galvanometer assembly is connected with the first half-reflection half-transmission lens, and is used for reflecting the laser beam to the focusing assembly, wherein the laser beam sequentially passes through the focusing assembly and the field lens element and is incident to the target area to form the laser spot.
4. The laser processing apparatus according to claim 1, wherein The focusing projection module comprises a first half-reflection half-transmission lens which is respectively connected with the laser module and the focal point contrast module; the first half-reflection half-transmission lens is used for reflecting the laser beam into the focusing projection module for focusing, and is also used for transmitting the light emitted by the LED point light source into the focusing projection module.
5. The laser processing apparatus according to claim 4, wherein The laser processing device further comprises a transmissive-reflection element which is respectively connected with the focusing projection module and the vision module; the transmissive-reflection element comprises a first surface and a second surface which is opposite to the first surface; the first surface is connected with the focusing projection module; the first surface is coated with a stacked antireflection film and a transmissive-reflection film, the antireflection film is used for increasing the reflectivity of the laser beam, and the transmissive-reflection film is used for reflecting and transmitting the light emitted by the LED point light source; the second surface is coated with an antireflection film, and the antireflection film is used for increasing the transmittance of the light emitted by the LED point light source which is reflected from the target area back to the vision module.
6. The laser processing apparatus according to claim 5, wherein The focusing projection module further comprises a galvanometer assembly, a focusing assembly and a field lens element which are arranged in sequence; The galvanometer assembly is in butt joint with the first half-reflection half-transmission lens, and is configured to reflect the laser beam to the focusing assembly, the laser beam is sequentially incident to the field lens element after passing through the focusing assembly, and the field lens element reflects the laser beam to the target area and forms the laser spot.
7. The laser processing apparatus as claimed in claim 1, wherein The focal point contrast module comprises a first projection lens, a second projection lens and a third projection lens arranged in sequence, and the first projection lens is in butt joint with the pattern element. The first projection lens, the second projection lens and the third projection lens are movable relative to the pattern element along the light path direction of the light emitted by the LED point light source, so as to adjust the divergence angle of the light emitted by the LED point light source and passing through the third projection lens.
8. The laser processing apparatus as claimed in claim 7, wherein The first projection lens is a crescent lens, the second projection lens is a double convex lens, and the third projection lens is a crescent lens.
9. The laser processing apparatus of claim 1, wherein The laser module comprises a laser light source configured to emit the laser beam, and a first processing lens, a second processing lens and a third processing lens arranged in sequence. The laser light source is in butt joint with the first processing lens, and the first processing lens is movable relative to the laser light source, so as to change the focal point position of the laser incident to the target area.
10. The laser processing apparatus as claimed in claim 9, wherein The first processing lens is a plano-concave lens, the second processing lens is a crescent lens, and the third processing lens is a plano-convex lens.