CN111736355A - Adjustable energy distribution optical system based on micro-lens group - Google Patents
Adjustable energy distribution optical system based on micro-lens group Download PDFInfo
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- CN111736355A CN111736355A CN202010627022.6A CN202010627022A CN111736355A CN 111736355 A CN111736355 A CN 111736355A CN 202010627022 A CN202010627022 A CN 202010627022A CN 111736355 A CN111736355 A CN 111736355A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/046—Automatically focusing the laser beam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
- G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Abstract
The invention discloses a micro-lens-group-based adjustable energy distribution optical system which comprises a first positive focal lens, a first negative focal lens, a second positive focal lens, a planoconcave type micro lens, a planoconvex type micro lens, a third positive focal lens, a second negative focal lens and a fourth positive focal lens. The invention has novel structural design, realizes the spot and point annular combined spot characteristics based on the matching of the micro lens and the focusing mirror, realizes the compensation and adjustment characteristics of the size of a collimation spot, the size of a focusing spot, the divergence angle of a light beam and a focal position based on the ZOOM optical system, realizes the continuous adjustment of the divergence angle of the focusing beam, the divergence angle of the spot to the point annular combined spot, the size of the spot, the middle diameter and the thickness of the annular spot and the energy ratio of the spot annular spot by rotating one micro lens along a light beam transmission axis at a small angle and combining the matching and adjustment of the double ZOOM optical system, is suitable for the laser welding application of a high-power optical fiber laser, and is particularly beneficial to improving the welding spatter.
Description
Technical Field
The invention relates to the technical field of optical fiber laser welding, in particular to an adjustable energy distribution optical system based on a micro-lens group.
Background
The laser processing technology covers various laser processing technologies such as laser cutting, welding, quenching, punching, micro-processing and the like, and utilizes the basic characteristic of interaction between laser and substances. The laser beam has the advantages of non-contact with the processing material, high processing speed, excellent quality and the like, so that the laser processing technology is a high and new technology without replacement.
The laser welding has the advantages of high energy density, high speed, small welding deformation, wide fusion, narrow heat affected zone and the like, and splashing is easily generated in the high-power optical fiber laser welding process. The particles generated by splashing can be attached to the surface of a molten pool and a workpiece, so that the surface roughness change is easily caused, the base metal is scratched, and the reworking of parts, the damage of components such as protective glasses inside a laser welding head and the like can be caused in serious cases.
As is well known, the quality of the light beam of the fiber laser is good, and a certain defocusing amount is needed in the laser welding process, defocusing light spots are generally in Gaussian energy distribution, and the central energy density is much higher than the edge energy density. Therefore, the laser spot energy distribution is changed, the violent boiling of the base material in the welding process is avoided, the Gaussian distribution beam is not used as far as possible, and the improvement of laser welding spatter is facilitated.
Currently, there are roughly several methods for improving the energy distribution of a laser beam: firstly, adjusting the energy distribution of a light beam from a laser source; and secondly, adjusting the energy distribution of the light beam from the laser processing head.
The energy distribution of light beams is shaped from a laser, the main stream comprises IPG, Coherent, Trumpf and the like, the energy distribution of point-ring combination can be realized by outputting laser beams through a multi-core coaxial optical fiber, and the ratio of the point-to-ring power under the condition of point-ring combination is adjustable. The problem is that the requirement of the multi-core coaxial optical fiber on the beam quality of the laser beam is extremely high, and the cost of the whole set of laser is more expensive than that of a common laser with the same power. In addition, the laser is adopted to realize the adjustment, the variation of the energy distribution near the focus can be ensured, and when the defocusing amount is larger, the energy distribution of the light beam gradually approaches Gaussian distribution, which is not beneficial to the removal of larger splashing particles.
The laser processing head is used for adjusting the energy distribution of light beams, typically a Precitec double-sheet micro lens, to realize point-annular combined light spot adjustment, and the defect is that the adaptability of the lens with the same specification to different optical fiber core diameters and different optical configurations is poor due to the same specification lens parameter. In addition, the scheme of a double-waveband welding head is adopted, the common optical fiber laser and 915nm semiconductor laser on the market are applied in a composite mode, the power of the used semiconductor laser is low, the quality of light beams is poor, and the absorption rate of materials to 915nm wavelength laser is not high, so that the optical fiber laser still has high output power, and laser splashing cannot be effectively improved.
Disclosure of Invention
The present invention is directed to a micro-lens-based adjustable energy distribution optical system, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a micro-lens-group-based adjustable energy distribution optical system comprises a first positive focal lens, a first negative focal lens, a second positive focal lens, a plano-concave type micro lens, a plano-convex type micro lens, a third positive focal lens, a second negative focal lens and a fourth positive focal lens; the first positive focal lens, the first negative focal lens, the second positive focal lens, the planoconcave microlens, the planoconvex microlens, the third positive focal lens, the second negative focal lens and the fourth positive focal lens are all made of fused quartz materials;
the central axes of the first positive focal lens, the first negative focal lens, the second positive focal lens, the planoconcave type microlens, the planoconvex type microlens, the third positive focal lens, the second negative focal lens and the fourth positive focal lens are coaxial;
the first positive focal lens, the first negative focal lens and the second positive focal lens form a ZOOM collimating optical system;
the third positive focal lens, the second negative focal lens and the fourth positive focal lens form a ZOOM focusing optical system;
the first positive focal lens, the second positive focal lens, the third positive focal lens and the fourth positive focal lens are all aspheric lenses, and the mirror surface is planoconvex, biconvex or positive meniscus;
the first negative focus lens and the third positive focus lens are both aspheric lenses, and the mirror surface is in a planoconcave shape, a biconcave shape or a negative meniscus shape.
Preferably, the plano-concave type micro lens and the plano-convex type micro lens form a point annular adjustable lens group; the plano-concave micro lens and the plano-convex micro lens are arranged between the second positive focal lens and the third positive focal lens.
Preferably, the plano-concave type micro lens and the plano-convex type micro lens are combined based on axicon light splitting and angular light splitting and are angular array micro lenses with symmetrical central axes, and the centers of the surfaces of the micro lenses are provided with planes with the same size; the plano-concave type micro lens and the plano-convex type micro lens are provided with the same angular light splitting units, the number of the angular light splitting units meets 10-100, the light splitting angles of all the angular light splitting units are the same, and light splitting peaks can be combined into one point; the plane-concave type micro-lens single angular light splitting unit light splitting surface comprises a plane and a convex surface, and the plane-convex type micro-lens single angular light splitting unit light splitting surface comprises a plane and a concave surface.
Preferably, the plano-concave type micro lens and the plano-convex type micro lens only have one lens which rotates along the light beam transmission shaft at a small angle, so that the continuous adjustment of the spot light spot to spot annular combined light spot and the intermediate diameter of the annular light spot is realized.
Preferably, in a ZOOM collimating optical system formed by the first positive-focus lens, the first negative-focus lens and the second positive-focus lens, only two lenses can move along the optical axis, so that the size adjustment of collimated light spots is realized; in a ZOOM focusing optical system formed by the third positive focus lens, the second negative focus lens and the fourth positive focus lens, only two lenses can move along an optical axis, and the adjustment of the divergence angles of focusing light spots and focusing light beams is realized by matching with the ZOOM collimating optical system.
Preferably, the using method comprises the following steps:
A. the fiber laser emits divergent light, and the divergent light is incident to the first positive focal lens to realize certain light beam convergence;
B. the converged light beam is diverged by the first negative-focus lens to form a divergent light beam, and the divergent light beam is collimated after passing through the second positive-focus lens;
C. the collimated light beams are shaped by the plano-concave micro lens and the plano-convex micro lens one by one, the shaped light beams are converged by the third positive focal lens, are diverged by the second negative focal lens in sequence, and are focused by the fourth positive focal lens to form focused light beams.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention has novel structural design, realizes the spot and point annular combined spot characteristics based on the matching of the micro lens and the focusing mirror, realizes the compensation and adjustment characteristics of the size of a collimation spot, the size of a focusing spot, the divergence angle of a light beam and a focal position based on the ZOOM optical system, realizes the continuous adjustment of the divergence angle of the focusing beam, the divergence angle of the spot to the point annular combined spot, the size of the spot, the middle diameter and the thickness of the annular spot and the energy ratio of the spot annular spot by rotating one micro lens along a light beam transmission axis at a small angle and combining the matching and adjustment of the double ZOOM optical system, is suitable for the laser welding application of a high-power optical fiber laser, and is particularly beneficial to improving the welding spatter.
(2) According to the plano-concave type micro lens and plano-convex type micro lens combination, one lens is rotated at a small angle along the direction of the optical axis, so that the adjustment of a focusing focus from a point light spot to a point annular combined light spot can be realized, under the condition of the point annular combined light spot, the intermediate diameter of the annular light spot can be adjusted, the energy distribution mode of the light spot is diversified, the energy distribution adaptability of various types of welding is greatly improved, and the compatibility of lasers with different optical fiber core diameters is strong.
(3) The ZOOM collimating optical system and the ZOOM focusing optical system are matched with each other for adjustment, so that the adjustment of the sizes of a focusing light spot and a divergence angle can be realized, and then the combination of the plano-concave micro lens and the plano-convex micro lens is combined, so that the light spot zooming and the divergence angle adjustment of a point-point annular combined light spot are further realized, and meanwhile, the power ratio adjustment of the point-point light spot and an annular light spot under the condition of the point-annular combined light spot is also realized, thereby being beneficial to improving the welding spatter and welding quality of different plates and being suitable for laser welding application under different welding seam widths.
(4) According to the optical system, under the point-ring combined light spot, the light spot energy distribution condition under the large-range defocusing amount is similar to the energy distribution condition near the focus, so that the melting constraint of large splashing particles with larger power in space and time during high-power laser welding is facilitated, the laser splashing problem can be further improved, and the welding quality is improved.
Drawings
FIG. 1 is an example of an optical embodiment of the present invention.
Fig. 2 is a schematic view of a point-ring adjustable lens group according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a point-to-point annular combined energy distribution according to an embodiment of the present invention.
FIG. 4 is an enlarged view of different spots with the same power ratio under the point-and-ring combination according to the embodiment of the present invention.
FIG. 5 is a schematic diagram of energy distribution of different power ratios for the same spot amplification under the point-and-ring combination of the present invention.
FIG. 6 is a schematic diagram of energy distribution of spots with different defocus amounts under the condition of point-annular combination according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below 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.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the present invention provides a technical solution: the lens comprises a first positive focus lens 1, a first negative focus lens 2, a second positive focus lens 3, a planoconcave type micro lens 4, a planoconvex type micro lens 5, a third positive focus lens 6, a second negative focus lens 7 and a fourth positive focus lens 8.
In the invention, the first positive focal lens 1, the first negative focal lens 2, the second positive focal lens 3, the planoconcave type microlens 4, the planoconvex type microlens 5, the third positive focal lens 6, the second negative focal lens 7 and the fourth positive focal lens 8 are all made of fused quartz materials;
the central axes of the first positive focal lens 1, the first negative focal lens 2, the second positive focal lens 3, the planoconcave type micro lens 4, the planoconvex type micro lens 5, the third positive focal lens 6, the second negative focal lens 7 and the fourth positive focal lens 8 are coaxial;
the first positive focus lens 1, the first negative focus lens 2 and the second positive focus lens 3 form a ZOOM collimating optical system;
the third positive focal lens 6, the second negative focal lens 7 and the fourth positive focal lens 8 form a ZOOM focusing optical system;
the plano-concave micro lens 4 and the plano-convex micro lens 5 form a point-ring adjustable lens group;
the plano-concave type micro lens 4 and the plano-convex type micro lens 5 are arranged between the second positive focal lens 3 and the third positive focal lens 6;
the first positive focal lens 1, the second positive focal lens 3, the third positive focal lens 6 and the fourth positive focal lens 8 are all aspheric lenses, and the mirror surface is planoconvex, biconvex or positive meniscus;
the first negative focus lens 2 and the third positive focus lens 6 are both aspheric lenses, and the mirror surface type is a planoconcave type, a biconcave type or a negative meniscus type;
the plano-concave micro lens 4 and the plano-convex micro lens 5 are combined based on axicon light splitting and angular light splitting, are angular array micro lenses with symmetrical central axes, and have planes with the same size in the centers of the micro lens surfaces;
the plano-concave type micro lens 4 and the plano-convex type micro lens 5 are provided with the same angular light splitting units, the number of the angular light splitting units meets 10-100, the light splitting angles of all the angular light splitting units are the same, and light splitting vertexes can be combined into one point;
the plane-concave type micro lens 4 single angular light splitting unit light splitting surface comprises a plane and a convex surface, and the plane-convex type micro lens 5 single angular light splitting unit light splitting surface comprises a plane and a concave surface.
In the invention, only one of the plano-concave micro lens 4 and the plano-convex micro lens 5 rotates at a small angle along the light beam transmission axis, so that the continuous adjustment of the spot-to-spot annular combined light spot and the intermediate diameter of the annular light spot is realized.
In the invention, in a ZOOM collimating optical system formed by the first positive-focus lens 1, the first negative-focus lens 2 and the second positive-focus lens 3, only two lenses can move along an optical axis, so that the size adjustment of collimated light spots is realized;
in a ZOOM focusing optical system formed by the third positive-focus lens 6, the second negative-focus lens 7 and the fourth positive-focus lens 8, only two lenses can move along an optical axis, and the adjustment of the divergence angles of focusing light spots and focusing light beams is realized by matching with the ZOOM collimating optical system.
The working principle is as follows: the using method of the invention comprises the following steps:
A. the fiber laser emits divergent light, and the divergent light enters the first positive focal lens 1 to realize certain light beam convergence;
B. the converged light beam is diverged by the first negative-focus lens 2 to form a divergent light beam, and the divergent light beam is collimated after passing through the second positive-focus lens 3;
C. collimated light beams are shaped by the plano-concave micro lens 4 and the plano-convex micro lens 5 successively, the shaped light beams are converged by the third positive focal lens 6, are diverged by the second negative focal lens 7, and are focused by the fourth positive focal lens 8 to form focused light beams.
When the ZOOM collimation optical system formed by the first positive focus lens 1, the first negative focus lens 2 and the second positive focus lens 3 and the corresponding movable lens of the ZOOM focusing optical system formed by the third positive focus lens 6, the second negative focus lens 7 and the fourth positive focus lens 8 are fixed at a certain position and are not moved, only one of the planoconcave type micro lens 4 and the planoconcave type micro lens 5 is rotated along the optical axis direction at different angles, so that the spot energy distribution from left to right and the spot annular combined spot energy distribution shown in FIG. 3 are realized, and under the condition of the spot annular combined spot, the intermediate diameter of the annular spot is adjustable, so that the energy mode diversity of the combined spot is realized.
When the ZOOM collimating optical system formed by the first positive-focus lens 1, the first negative-focus lens 2 and the second positive-focus lens 3 and the point-ring adjustable lens group formed by the planoconcave type micro lens 4 and the planoconvex type micro lens 5 are fixed in a certain state, two lenses in the ZOOM focusing optical system formed by the third positive-focus lens 6, the second negative-focus lens 7 and the fourth positive-focus lens 8 are only moved along the optical axis direction, so that amplification of different times of ring-shaped combined light spots from left to right as shown in FIG. 4 is realized, specifically, the point size and the ring-shaped light spot magnification are realized, and the power ratio of the point-ring-shaped light spots is kept unchanged.
When the ZOOM collimating optical system formed by the first positive focus lens 1, the first negative focus lens 2 and the second positive focus lens 3 and the corresponding movable lenses of the ZOOM focusing optical system formed by the third positive focus lens 6, the second negative focus lens 7 and the fourth positive focus lens 8 move in a matching manner to realize the same spot magnification, one of the planoconcave type micro lens 4 and the planoconcave type micro lens 5 is rotated along the optical axis direction at different angles to realize the spot-ring-shaped combined spots with the same size from left to right as shown in FIG. 5, and the power ratio of the spot-ring-shaped spots is continuously adjustable.
In the process of adjusting the point-ring-shaped combined light spot, the light spot energy distribution under different defocusing amounts from left to right before the focus, the focus and after the focus as shown in fig. 6 is obtained at the same time, and the method is characterized in that even under a larger defocusing amount, the energy distribution mode of the point-ring-shaped combined light spot is still maintained.
The above annular light spot pitch diameter is the diameter of a focusing focus light spot under the diameter of the optical fiber core of 0; the thickness of the annular light spot refers to the line diameter of the focusing light spot when the diameter of the optical fiber core is not 0, namely the width of the energy area.
In conclusion, the invention has novel structural design, realizes the spot and point annular combined spot characteristics based on the matching of the micro lens and the focusing mirror, realizes the compensation and adjustment characteristics of the size of the collimated spot, the size of the focused spot, the divergence angle of a light beam and the position of a focus based on the ZOOM optical system, realizes the continuous adjustment of the divergence angle of the focused beam, the point spot to point annular combined spot, the size of the point spot, the diameter and thickness of the annular spot and the energy ratio of the point annular spot by combining the matching and adjustment of the double ZOOM optical system in a manner of rotating one micro lens along a light beam transmission shaft at a small angle, is suitable for the laser welding application of a high-power optical fiber laser, and is particularly beneficial to the improvement of welding spatter.
The invention is not described in detail, but is well known to those skilled in the art.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. An adjustable energy distribution optical system based on a micro-lens group is characterized in that: the device comprises a first positive focal lens (1), a first negative focal lens (2), a second positive focal lens (3), a planoconcave type micro lens (4), a planoconvex type micro lens (5), a third positive focal lens (6), a second negative focal lens (7) and a fourth positive focal lens (8); the first positive focal lens (1), the first negative focal lens (2), the second positive focal lens (3), the planoconcave type micro lens (4), the planoconvex type micro lens (5), the third positive focal lens (6), the second negative focal lens (7) and the fourth positive focal lens (8) are all made of fused quartz materials;
the central axes of the first positive focal lens (1), the first negative focal lens (2), the second positive focal lens (3), the planoconcave type micro lens (4), the planoconvex type micro lens (5), the third positive focal lens (6), the second negative focal lens (7) and the fourth positive focal lens (8) are coaxial;
the first positive focal lens (1), the first negative focal lens (2) and the second positive focal lens (3) form a ZOOM collimating optical system;
the third positive focal lens (6), the second negative focal lens (7) and the fourth positive focal lens (8) form a ZOOM focusing optical system;
the first positive focal lens (1), the second positive focal lens (3), the third positive focal lens (6) and the fourth positive focal lens (8) are all aspheric lenses, and the mirror surface is planoconvex, biconvex or positive meniscus;
the first negative focus lens (2) and the third positive focus lens (6) are both aspheric lenses, and the mirror surface type is a planoconcave type, a biconcave type or a negative meniscus type.
2. A microlens-based adjustable energy distribution optical system as claimed in claim 1, wherein: the plano-concave micro lens (4) and the plano-convex micro lens (5) form a point-ring adjustable lens group; the plano-concave type micro lens (4) and the plano-convex type micro lens (5) are arranged between the second positive focal lens (3) and the third positive focal lens (6).
3. A microlens-based adjustable energy distribution optical system as claimed in claim 1, wherein: the plano-concave micro lens (4) and the plano-convex micro lens (5) are combined based on axicon light splitting and angular light splitting and are angular array micro lenses with central axes symmetrical, and the centers of the surfaces of the micro lenses are provided with planes with the same size; the plano-concave type micro lens (4) and the plano-convex type micro lens (5) are provided with the same angular light splitting units, the number of the angular light splitting units meets 10-100, the light splitting angles of all the angular light splitting units are the same, and light splitting vertexes can be combined into one point; the plane-concave type micro lens (4) single angular light splitting unit light splitting surface type comprises a plane and a convex surface, and the plane-convex type micro lens (5) single angular light splitting unit light splitting surface type comprises a plane and a concave surface.
4. A microlens-based adjustable energy distribution optical system as claimed in claim 3, wherein: the plano-concave type micro lens (4) and the plano-convex type micro lens (5) only have one lens which rotates along the light beam transmission shaft at a small angle, and continuous adjustment of the spot-to-spot annular combined light spot and the intermediate diameter of the annular light spot is realized.
5. A microlens-based adjustable energy distribution optical system as claimed in claim 1, wherein: in a ZOOM collimating optical system formed by the first positive focal lens (1), the first negative focal lens (2) and the second positive focal lens (3), only two lenses can move along an optical axis to realize the size adjustment of collimated light spots; in a ZOOM focusing optical system formed by the third positive focal lens (6), the second negative focal lens (7) and the fourth positive focal lens (8), only two lenses can move along an optical axis, and the adjustment of the divergence angles of focusing light spots and focusing light beams is realized by matching with the ZOOM collimating optical system.
6. The use method of the micro-lens group based adjustable energy distribution optical system is realized according to claim 1, and is characterized in that: the using method comprises the following steps:
A. the fiber laser emits divergent light, and the divergent light enters the first positive focal lens (1) to realize certain light beam convergence;
B. the converged light beam is diverged by the first negative-focus lens (2) to form a divergent light beam, and the divergent light beam is collimated after passing through the second positive-focus lens (3);
C. collimated light beams are shaped by the plano-concave micro lens (4) and the plano-convex micro lens (5) successively, the shaped light beams are converged by the third positive focal lens (6), diverged by the second negative focal lens (7) in sequence, and finally focused by the fourth positive focal lens (8) to form focused light beams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010627022.6A CN111736355A (en) | 2020-07-01 | 2020-07-01 | Adjustable energy distribution optical system based on micro-lens group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010627022.6A CN111736355A (en) | 2020-07-01 | 2020-07-01 | Adjustable energy distribution optical system based on micro-lens group |
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| Publication Number | Publication Date |
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| CN111736355A true CN111736355A (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010627022.6A Withdrawn CN111736355A (en) | 2020-07-01 | 2020-07-01 | Adjustable energy distribution optical system based on micro-lens group |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036581A (en) * | 2021-03-24 | 2021-06-25 | 镭泽精密制造(苏州)有限公司 | Laser with adjustable light source precision |
| CN115592263A (en) * | 2022-12-14 | 2023-01-13 | 深圳市汉威激光设备有限公司（Cn） | Welding head with circular light beam spot changing ring light beam and adjustable energy distribution |
-
2020
- 2020-07-01 CN CN202010627022.6A patent/CN111736355A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036581A (en) * | 2021-03-24 | 2021-06-25 | 镭泽精密制造(苏州)有限公司 | Laser with adjustable light source precision |
| CN115592263A (en) * | 2022-12-14 | 2023-01-13 | 深圳市汉威激光设备有限公司（Cn） | Welding head with circular light beam spot changing ring light beam and adjustable energy distribution |
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Application publication date: 20201002 |