CN110488398A - It is a kind of to obtain adjustable bifocal free-form surface lens - Google Patents
It is a kind of to obtain adjustable bifocal free-form surface lens Download PDFInfo
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- CN110488398A CN110488398A CN201910764220.4A CN201910764220A CN110488398A CN 110488398 A CN110488398 A CN 110488398A CN 201910764220 A CN201910764220 A CN 201910764220A CN 110488398 A CN110488398 A CN 110488398A
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- China
- Prior art keywords
- lens
- free
- form surface
- surface lens
- cut
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Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/06—Simple or compound lenses with non-spherical faces with cylindrical or toric faces
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Laser Beam Processing (AREA)
Abstract
Adjustable bifocal free-form surface lens are obtained the invention discloses a kind of, the toroidal lens is a kind of cylindrical lens, structure of the invention is novel in design, based on hyperfocal distance optical mirror slip characteristic, based on the dichroism under the segmentation of single mirror surface different parameters, by being rotated along cut-off rule direction, along the direction freedom of movement toroidal lens perpendicular to beam Propagation axis and cut-off rule, cooperation focus lamp can realize focal beam spot from single focus to bifocus, bifocus spacing, bifocus energy ratio is adjustable, it is particularly suitable for laser welding application, it is particularly helpful to reduce plate lap width and clamping requirement, reduce the various defects generated in high anti-material welding, it is suitable for different materials, equal thickness material does not weld, and improve quality of weld seam molding.
Description
Technical field
The present invention relates to technical field of laser welding, specially a kind of to obtain adjustable bifocal free-form surface lens.
Background technique
Laser processing technology covers a variety of laser processing technologies such as laser cutting, welding, quenching, punching, micro Process, benefit
With the fundamental characteristics of high-order harmonics spectrum.Since laser beam has untouchable, the process velocity with rapidoprint
Fastly with the advantages such as good quality, having established laser processing technology is a kind of new and high technology that can not be substituted.
Laser welding has many advantages, such as that energy density is high, speed is fast, welding deformation is small, molten wide and heat affected area are narrow.But
It is that, for the laser welding of high anti-material, common welding manner is insufficient for welding demand, such as the Laser Welding of aluminium alloy
It connects, easily cracks, the laser weldings defect such as stomata；The welding of even common plate such as carbon steel, stainless steel etc., it will usually
It is influenced by plate overlap joint slit width, height is required to clamping jig, laser or laser head configuration are correspondinglyd increase.
In addition to this, for the not laser welding of equal thickness plate or the laser welding of different materials, due to plate thickness
Or material is different, has different requirements to welding laser beam.
Currently, common welding manner is single focus welding, to improve high anti-material welding quality, to reduce plate to dress
The requirement such as clamp tool, for the plate welding for adapting to different materials, non-equal thickness, it will usually be welded using double focus laser.
For high anti-material, when bifocus vertical weld direction is with weld seam both sides are fallen within, it can be formed biggish
Molten bath and keyhole increase keyhole stability, are conducive to air entrapment floating, improve the stomata inside weld seam to a certain extent.
For common material, double focus welding helps to improve weld width to a certain extent, reduces plate overlap joint
Width limitation, to reduce the requirement such as attached clamping jig, laser.
Different materials are welded, laser absorption rate is different；For different-thickness plate, to ensure that welding fabrication quality needs
It asks energy different, in such a way that bifocus energy distributes, can preferably realize the above laser welding demand.
In certain welding occasions, bifocus is placed in weld seam, a hot spot welding in parallel, a hot spot handles surface,
It can effectively improve face of weld quality.
It is more to can be realized bifocal method, such as Amici prism light splitting, lenticule shaping, free-form surface lens group, half
Piece spherical lens etc..It is divided using Amici prism, single eyeglass focus spacing is non-adjustable, two lens defocus light when realizing single focus
Beam section, which is not overlapped, causes the angle of divergence to become larger, defocused spot shape asymmetric distribution when realizing bifocus；Current routine on the market
Lenticule cannot achieve dual focal spot modulation；Free-form surface lens group realizes bifocus, needs two panels lens set to merge and coordinates movement
It realizes that bifocus and energy ratio are adjusted, and will affect focused spot size to a certain extent；The unbearable height of half spherical lens
Power application, and it is similar with double-disk Amici prism, defocused spot shape asymmetric distribution, is unfavorable for Laser Welding under bifocus
It connects.
Based on the premises, the present invention proposes a kind of adjustable bifocal free-form surface lens of acquisition, based on infinitely great burnt
Away from optical mirror slip characteristic, based on the dichroism under the segmentation of single mirror surface different parameters, by rotating, along cut-off rule direction along vertical
In the direction freedom of movement toroidal lens of beam Propagation axis and cut-off rule, cooperate focus lamp can realize focal beam spot from single focus to
Bifocus, bifocus spacing, bifocus energy ratio is adjustable, is particularly suitable for laser welding application, is particularly helpful to reduce plate
Lap width and clamping requirement reduce the various defects generated in high anti-material welding, are suitable for different materials, non-equal thickness material
Material welding, and improve quality of weld seam molding.
Summary of the invention
Adjustable bifocal free-form surface lens are obtained the purpose of the present invention is to provide a kind of, to solve above-mentioned background skill
The problem of being proposed in art.
To achieve the above object, the invention provides the following technical scheme: a kind of adjustable bifocal free form surface of acquisition is saturating
Mirror, the free-form surface lens are a kind of cylindrical lens, and the free-form surface lens shape is including but not limited to rectangular shape.
Preferably, each mirror surface of the free-form surface lens is made of two tangent cylindrical surface types, the cylinder face
Type includes concave cylinder, plane, convex cylinder, wherein the tangent tangent line of two cylindrical surface types is cut-off rule.
Preferably, two mirror surface cut-off rules of the free-form surface lens are parallel, and cut-off rule is parallel to entire eyeglass column
Face direction.
Preferably, two cut-off rules of the free-form surface lens constitute a plane, and half of plane both ends lens are effectively burnt
Away from being infinity.
Preferably, setting collimation microscope group above the free-form surface lens, lower section setting focus microscope group, the collimating mirror
Group, toroidal lens, focusing microscope group center are on same straight line.
Preferably, application method the following steps are included:
A, optical fiber laser is emitted diverging light, is incident on collimation microscope group to obtain parallel collimated beam；
B, collimated light beam is focused by focusing microscope group again after free-form surface lens.
Compared with prior art, the beneficial effects of the present invention are:
(1) structure of the invention is novel in design, is based on hyperfocal distance optical mirror slip characteristic, based on single mirror surface different parameters point
The dichroism cut off, by being rotated along cut-off rule direction, along the direction freedom of movement perpendicular to beam Propagation axis and cut-off rule
Toroidal lens, cooperation focus lamp can realize focal beam spot from single focus to bifocus, bifocus spacing, bifocus energy ratio can
It adjusts, is particularly suitable for laser welding application, be particularly helpful to reduce plate lap width and clamping requirement, reduce high anti-material weldering
The various defects for connecing middle generation are suitable for different materials, the welding of non-equal thickness material, and improve quality of weld seam molding.
(2) present invention does not influence focal beam spot size and focal position by being used cooperatively with focus lamp.It is single burnt realizing
When point, the generally solid light beam section of focus on light beam section, Energy distribution is similarly configured with normal optical；When realizing bifocus, from
The distribution of defocused laser beam section hot spot symmetrical shape, is conducive to laser welding application, and positive and negative defocus dual-beam can be achieved as needed, can
Expand to other laser processing applications.
(3) free-form surface lens of the invention, since number of lenses is few, regulative mode is easier to realize, is conducive to machinery
Design, and reduce whole mechanical dimension, it can be by being inserted into other conventional optical systems in modular form.
Detailed description of the invention
Fig. 1 is free-form surface lens schematic diagram of the invention.
Fig. 2 is embodiment of the free-form surface lens of the present invention in optical-fiber laser optical path.
Focus on light beam section positive and negative defocused spot energy profile when Fig. 3 is single focus of the embodiment of the present invention.
Fig. 4, which rotates for free-form surface lens of the embodiment of the present invention along cut-off rule direction, realizes focal position single focus to bifocal
The continuously adjustable schematic diagram of point.
When Fig. 5 is that free-form surface lens of the embodiment of the present invention realize bifocus, along perpendicular to beam Propagation axis and cut-off rule
The mobile lower bifocus energy ratio in direction be continuously adjusted schematic diagram.
Fig. 6 is the focus and positive and negative defocus energy profile when the embodiment of the present invention realizes negative defocus dual-beam.
Focus and positive and negative defocus energy profile when Fig. 7 is realization positive out of focus dual-beam of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of to obtain adjustable bifocal free-form surface lens, institute
Stating free-form surface lens 1 is a kind of cylindrical lens, and 1 shape of free-form surface lens is including but not limited to rectangular shape.
In the present invention, each mirror surface of free-form surface lens 1 is made of two tangent cylindrical surface types, the cylindrical surface type
Including concave cylinder, plane, convex cylinder, wherein the tangent tangent line of two cylindrical surface types is cut-off rule.
In the present invention, two mirror surface cut-off rules of free-form surface lens 1 are parallel, and cut-off rule is parallel to entire eyeglass cylinder
Direction.
In the present invention, 1 two cut-off rules of free-form surface lens constitute a plane, half of plane both ends lens effective focal length
It is infinity.
In the present invention, free-form surface lens 1 need that focus lamp is cooperated to use, and do not influence focal beam spot size and focus position
It sets；Free-form surface lens 1 cooperate focus lamp in use, realizing focus on light beam single focus to bifocal by rotating along cut-off rule direction
Point, bifocus spacing are adjusted；Free-form surface lens 1 cooperate focus lamp in use, along perpendicular to beam Propagation axis and cut-off rule
Direction is mobile to realize that bifocus energy ratio is adjusted.
Setting collimation microscope group 2 above free-form surface lens 1, lower section setting focus microscope group 3, and the collimation microscope group 2, curved surface are saturating
Mirror 1, focusing 3 center of microscope group are on same straight line.
As shown in Fig. 2, application method of the invention the following steps are included:
A, optical fiber laser is emitted diverging light, is incident on collimation microscope group 2 to obtain parallel collimated beam；
B, collimated light beam is focused by focusing microscope group 3 again after free-form surface lens 1.
When free-form surface lens 1 rotate along cut-off rule direction and obtain single focus, defocus light beam section energy is also solid point
Cloth is close with reference to the beam energy distribution under Fig. 3, with conventional configuration.
In free-form surface lens 1 along the rotary course of cut-off rule direction, focusing focus hot spot from single focus to bifocus, it is double
Focus spacing is continuously adjustable, with reference to Fig. 4.
When free-form surface lens 1 rotate by a certain angle the bifocus under realizing some size spacing along cut-off rule direction,
Free-form surface lens 1 are moved along the direction perpendicular to beam Propagation axis and cut-off rule, realize focusing focus position bifocus energy
Amount is than adjusting, with reference to Fig. 5.
It is real when free-form surface lens 1 rotate clockwise certain angle along cut-off rule direction based on single focus corresponding position
Now negative defocus light beam section light splitting, the corresponding positive and negative defocused spot Energy distribution of focus on light beam section refer to Fig. 6.
It is real when free-form surface lens 1 are rotated by a certain angle based on single focus corresponding position along cut-off rule direction counterclockwise
Existing positive out of focus light beam section light splitting, the corresponding positive and negative defocused spot Energy distribution of focus on light beam section refer to Fig. 7.
In Fig. 3, Fig. 6, Fig. 7, from left to right respectively before focus after different distance, focus, focus under different distance
Spot energy distribution, middle graph are focal position spot energy distribution.
In conclusion structure of the invention is novel in design, it is based on hyperfocal distance optical mirror slip characteristic, it is different based on single mirror surface
Dichroism under non-parametric segmentation is moved by rotating along cut-off rule direction, along perpendicular to the direction of beam Propagation axis and cut-off rule
Dynamic free-form surface lens, cooperation focus lamp can realize focal beam spot from single focus to bifocus, bifocus spacing, bifocus energy
Than adjustable, it is particularly suitable for laser welding application, is particularly helpful to reduce plate lap width and clamping requirement, reduces Gao Fancai
The various defects generated in material welding are suitable for different materials, the welding of non-equal thickness material, and improve quality of weld seam molding.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of obtain adjustable bifocal free-form surface lens, it is characterised in that: the free-form surface lens (1) are a kind of column
Face type lens, free-form surface lens (1) shape is including but not limited to rectangular shape.
2. a kind of adjustable bifocal free-form surface lens of acquisition according to claim 1, it is characterised in that: the freedom
Each mirror surface of toroidal lens (1) is made of two tangent cylindrical surface types, the cylindrical surface type include concave cylinder, plane,
Convex cylinder, wherein the tangent tangent line of two cylindrical surface types is cut-off rule.
3. a kind of adjustable bifocal free-form surface lens of acquisition according to claim 1, it is characterised in that: the freedom
Two mirror surface cut-off rules of toroidal lens (1) are parallel, and cut-off rule is parallel to entire eyeglass cylinder direction.
4. a kind of adjustable bifocal free-form surface lens of acquisition according to claim 1, it is characterised in that: the freedom
(1) two cut-off rule of toroidal lens constitutes a plane, and half of plane both ends lens effective focal length is infinity.
5. a kind of adjustable bifocal free-form surface lens of acquisition according to claim 1, it is characterised in that: the freedom
Setting collimation microscope group above toroidal lens (1), lower section setting focus microscope group, and the collimation microscope group, focuses in microscope group toroidal lens
The heart is on same straight line.
6. realizing a kind of application method for obtaining adjustable bifocal free-form surface lens described in claim 1, feature exists
In: its application method the following steps are included:
A, optical fiber laser is emitted diverging light, is incident on collimation microscope group (2) to obtain parallel collimated beam；
B, collimated light beam is focused by focusing microscope group (3) again after free-form surface lens (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910764220.4A CN110488398A (en) | 2019-08-19 | 2019-08-19 | It is a kind of to obtain adjustable bifocal free-form surface lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910764220.4A CN110488398A (en) | 2019-08-19 | 2019-08-19 | It is a kind of to obtain adjustable bifocal free-form surface lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110488398A true CN110488398A (en) | 2019-11-22 |
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ID=68551973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910764220.4A Withdrawn CN110488398A (en) | 2019-08-19 | 2019-08-19 | It is a kind of to obtain adjustable bifocal free-form surface lens |
Country Status (1)
| Country | Link |
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| CN (1) | CN110488398A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023221318A1 (en) * | 2022-05-18 | 2023-11-23 | 上海嘉强自动化技术有限公司 | Free-form lens, optical system and laser welding equipment comprising same |
-
2019
- 2019-08-19 CN CN201910764220.4A patent/CN110488398A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023221318A1 (en) * | 2022-05-18 | 2023-11-23 | 上海嘉强自动化技术有限公司 | Free-form lens, optical system and laser welding equipment comprising same |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20191122 |