CN216966624U - Laser filamentation cutting device - Google Patents

Abstract

The utility model discloses a laser filamentation cutting device, which comprises an axicon lens, a long-focus lens, a galvanometer component and a field lens, wherein a laser beam is converted into a Bezier beam through the axicon lens, the Bezier beam is projected on the galvanometer component through the long-focus lens, the deflection of the Bezier beam is controlled through the galvanometer component, the Bezier beam is interfered through the field lens, a linear focus with long focal depth is formed, and the rapid cutting can be realized on the surface of a workpiece. The Bessel light beam has longer focal depth, is reflected by the galvanometer component and then passes through the field lens to be projected on the surface of the workpiece, and even if the light beam is deviated to change the distance between the field lens and the projection point, the projection point is still in the focal depth range, and the cutting effect is not influenced.

Description

Laser filamentation cutting device

Technical Field

The utility model relates to the field of laser cutting, in particular to a laser filamentation cutting device.

Background

With the development of science and technology, transparent materials such as glass, sapphire and the like have been widely applied to the fields of consumer electronics such as fingerprint identification keys, camera protective lenses, flat panels, smart phone screens and the like. Before the transparent material is applied to a product, the transparent material is subjected to a cutting process. Since the transparent material has a characteristic of high hardness, the transparent material is often cut with a laser in the related art. The Bessel cutting lens can convert a Gaussian beam of a laser from a circular beam into a linear focusing point formed by interference of the Bessel beam, and is used for wire cutting of sapphire and glass-transition materials. In practical cutting, the existing application realizes the purpose of cutting in different shapes by moving either a Bessel cutting lens or a processing plane. The processing efficiency is relatively low whether the bessel cutting lens is moved or the processing plane is moved.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a laser wire-forming cutting device, and aims to solve the problem that in the prior art, the wire-forming cutting efficiency of laser on materials such as sapphire and glass is low.

In order to achieve the purpose, the utility model provides a laser filamentation cutting device according to the light path principle of a Bessel cutting lens, which comprises an axicon, a long-focus lens, a galvanometer component and a field lens, wherein the axicon, the long-focus lens, the galvanometer component and the field lens are sequentially arranged along the light path direction;

the axicon is used for converting collimated light beams into Bessel light beams, the Bessel light beams are irradiated on the vibrating mirror assembly through the long-focus lens, the vibrating mirror assembly is used for controlling deflection of the Bessel light beams, and the field lens is used for focusing the Bessel light beams on a workpiece in an interference mode.

In one embodiment, the long focal length lens is located at the Bezier focal depth end of the axicon, and the focal point of the long focal length lens is located between the galvanometer component and the field lens.

In an embodiment, the galvanometer assembly includes a first galvanometer that deflects the bessel beam in a first plane and a second galvanometer that deflects the bessel beam in a second plane, the second plane being perpendicular to the first plane.

In an embodiment, the laser filamentation cutting device further comprises a laser generator and a beam expander, and laser emitted by the laser generator is incident into the axicon through the beam expander.

In one embodiment, the laser beam generated by the laser generator comprises a gaussian beam, a flat-top beam, or a multimode beam, and the laser generated by the laser generator comprises ultraviolet light, infrared light, or green light.

In one embodiment, the cone angle α of the axicon is < 30 °.

In one embodiment, the diameter of the laser spot incident on the axicon is less than 8 mm.

In an embodiment, the field lens comprises a flat field focusing lens, the focal length of the field lens being greater than 80 mm.

In an embodiment, the laser filamentation cutting device further comprises a laser antireflection film plated on the surface of the axicon.

The utility model discloses a laser filamentation cutting device which comprises an axicon, a long-focus lens, a galvanometer component and a field lens, wherein the laser filamentation cutting device enables laser beams to be converted into Bessel beams through the axicon, the Bessel beams are projected on the galvanometer component through the long-focus lens, the deflection of the Bessel beams is controlled through the galvanometer component, the interference of the Bessel beams is generated through the field lens, a linear focus with long focal depth is formed, and the rapid filamentation cutting can be realized on one surface of a workpiece. In addition, the Bessel light beam has longer focal depth, is reflected by the galvanometer component and then passes through the field lens to be projected on the surface of the workpiece, and even if the light beam is deviated to change the distance between the field lens and the projection point, the projection point is still in the focal depth range, and the cutting effect is not influenced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a laser filament-forming cutting apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another embodiment of the laser filament-forming cutting device according to the present invention.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "a and/or B" as an example, including either the a aspect, or the B aspect, or both the a and B aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a laser filamentation cutting device, which comprises an axicon lens 10, a long-focus lens 20, a galvanometer component 30 and a field lens 40 which are sequentially arranged along the direction of a light path, and is shown in a figure 1 and a figure 2; the axicon lens 10 is used for converting a collimated light beam into a Bessel light beam, the long-focus lens 20 is used for focusing the Bessel light beam, the vibrating mirror assembly 30 is used for controlling deflection of the Bessel light beam, and the field lens 40 is used for generating interference of the Bessel light beam to form a line focus with a long focal depth. The long-focus lens 20 is located at the end of the bessel depth of focus of the axicon lens 10, and the focus point of the long-focus lens 20 is located between the galvanometer component 30 and the field lens 40. The laser filamentation cutting light path overcomes the characteristic that the laser cutting focal depth is short (generally less than 1mm), the focal depth of the laser filamentation cutting device is more than 5mm, the cutting with long focal depth can be realized, and the laser filamentation cutting light path is suitable for thicker workpiece materials. In addition, the galvanometer assembly 30 can be used for controlling deflection of the Bessel light beam, so that the light spot can be controlled to move rapidly on the projection surface. The operation speed of the galvanometer can reach 10m/s, for example, the galvanometer of the model Extrascan 10. The moving speed of the moving platform is 200mm/s, for example, the model is ONE-XY 60X-Y axis moving platform. The efficiency of the control light deflection of the galvanometer is 50 times of the efficiency of the mobile platform, and the cutting efficiency of laser cutting is further improved.

According to the utility model, by arranging the laser filamentation cutting device comprising the axicon 10, the long-focus lens 20, the galvanometer assembly 30 and the field lens 40, a laser beam is converted into a Bezier beam through the axicon 10, the Bezier beam is projected on the galvanometer assembly 30 through the long-focus lens, the deflection of the Bezier beam is controlled through the galvanometer assembly 30, and the interference of the Bezier beam is generated through the field lens 40, so that a linear focus with long focal depth is formed. The Bessel beam has a longer focal depth, and is reflected by the galvanometer assembly 30 and then projected on the surface of the workpiece through the field lens 40, so that even if the distance between the field lens 40 and the projection point is changed due to the deviation of the beam, the projection point is still in the focal depth range, and the cutting effect is not influenced.

In an embodiment, the galvanometer assembly 30 includes a first galvanometer 31 that deflects the Bezier beam in a first plane and a second galvanometer 32 that deflects the Bezier beam in a second plane perpendicular to the first plane. In this embodiment, the surface of the workpiece is a projection plane, and the first plane, the second plane and the surface of the workpiece are perpendicular to each other to form a coordinate system. The first galvanometer 31 controls the light spots to move on the surface of the workpiece along the X-axis direction, and the second galvanometer 32 controls the light spots to move on the surface of the workpiece along the Y-axis direction, so that the control of the coordinates of the light spots on the surface of the workpiece is realized.

In one embodiment, the field lens 40 includes a flat field focusing lens that receives the bessel beams and focuses the bessel beam interference lines on the surface of the work piece to be cut. A flat field focusing lens, also called field lens 40 and f-theta focusing lens, is a professional lens system and aims to form a uniform focusing spot of laser beam in the whole marking plane. A common single-chip convex lens only forms a circular focusing light spot when light vertically passes through the center. When the light rays are obliquely incident into the light rays of the common single-chip convex lens, the light rays are not coaxially incident. The focused spot must then be deformed. More importantly, the focal point of the light is not in the focal plane when the light is perpendicular. The focal length varies with the deflection angle and thus the focal position. When the galvanometer scans, a flat field image surface can be obtained by using the flat field lens 40; in terms of aberration correction, curvature of field and distortion of the system can be compensated.

In one embodiment, the axicon is a conical prism defined by its alpha and vertex angles. The condenser lens may focus light at a point on the optical axis, such as a plano-convex lens, a biconvex lens, or an aspheric lens. The axicon can focus light to multiple points on the optical axis, the beam generated by the axicon passes through the optical axis, and as the distance from the axicon to the image increases, the diameter of the formed halo increases, while the thickness of the halo remains the same. The beam has the characteristics of a Bezier beam having a Bezier depth of focus, and the light intensity distribution in the beam propagation direction does not change. The material of the axicon lens 10 is fused silica. Specifically, fused silica has a relatively high melting temperature under laser light due to its relatively low coefficient of thermal expansion and stable chemical properties. In an embodiment, the laser filamentation cutting device further comprises a laser antireflection film plated on the surface of the axicon lens 10. Specifically, since light waves have the same interference property as mechanical waves, the antireflection film utilizes the principle of light interference, and light reflected by the front surface and the rear surface of the film interferes with each other to reduce the intensity of reflected light, thereby increasing the intensity of transmitted light.

In an embodiment, the laser filamentation cutting device further comprises a beam expander 50 arranged on the light inlet side of the axicon lens 10, and the beam expander 50 is a lens assembly capable of changing the diameter and the divergence angle of the laser beam. For laser processing, a focusing mirror can be used to obtain fine high-power-density light spots only by adjusting the beam expander 50 to convert the laser beam into a collimated beam; in the laser ranging process, the ideal remote measurement effect can be obtained only by improving the collimation degree of the laser to the maximum extent through the beam expander 50; the beam diameter can be changed by the beam expander 50 for use in different optical instrument devices; the beam expander 50, when used in conjunction with a spatial filter, can change the asymmetric beam distribution into a symmetric distribution and make the light energy distribution more uniform.

The utility model also provides a laser filamentation cutting device, which comprises the laser filamentation cutting device and a laser generator 60. The laser beam generated by the laser generator 60 may include a gaussian beam, a flat-top beam, or a multi-mode beam. The laser generating device can be an ultraviolet laser, a green laser and an infrared laser.

In one embodiment, the laser generator 60 may be a picosecond laser, the laser generator 60 emitting laser light comprising: ultraviolet light with a wavelength of 355nm, green light with a wavelength of 532nm or infrared light with a wavelength of 1064 nm.

In one embodiment, the beam expander 50 may be a 1 to 8 fold beam expander 50. The spot incident on the axicon lens 10 is less than 8 mm. The cone angle α of the axicon 10 is < 30 °. If the focal length of the long-focus lens 20 is 250 mm. The optical path distances between the long-focus lens 20 and the first galvanometer and the second galvanometer are both less than 250 mm. The optical path distance from the long focal length to the field lens 40 is greater than 250 mm. The focal length of the field lens 40 is greater than 80 mm. The distance between the field lens 40 and the galvanometer is adjusted to obtain different focal depths, so that the processing materials with different thicknesses can be cut.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention that are made by using the contents of the specification and the drawings or directly/indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (9)

1. A laser filamentation cutting device is characterized by comprising an axicon, a long-focus lens, a galvanometer component and a field lens which are sequentially arranged along the direction of a light path;

the axicon is used for converting collimated light beams into Bessel light beams, the Bessel light beams are irradiated on the vibrating mirror assembly through the long-focus lens, the vibrating mirror assembly is used for controlling deflection of the Bessel light beams, and the field lens is used for focusing interference lines of the Bessel light beams on a workpiece.

2. The laser filamentation cutting device of claim 1, wherein the long focal length lens is located at the Bezier depth of focus end of the axicon, the focal point of the long focal length lens being located between the galvanometer assembly and the field lens.

3. The laser filamentation cutting device of claim 1, wherein the galvanometer assembly includes a first galvanometer that deflects the Bezier beam in a first plane and a second galvanometer that deflects the Bezier beam in a second plane, the second plane being perpendicular to the first plane.

4. The laser filamentation cutting device of claim 1, further comprising a laser generator and a beam expander, wherein laser light emitted by the laser generator is injected into the axicon through the beam expander.

5. The laser filamentation cutting device of claim 4, wherein the laser beam generated by the laser generator comprises a Gaussian beam, a flat-top beam, or a multimode beam, and the laser generated by the laser generator comprises ultraviolet light, infrared light, or green light.

6. The laser filamentation cutting device of claim 1, wherein the cone angle α of the axicon is < 30 °.

7. The laser filamentation cutting device of claim 1, wherein the spot diameter of the laser beam incident on the axicon is less than 8 mm.

8. The laser filamentation cutting apparatus of claim 1, wherein the field lens comprises a flat field focusing lens, the focal length of the field lens being greater than 80 mm.

9. The laser filamentation cutting device of claim 1, further comprising a laser antireflection coating plated on the surface of the axicon.

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