CN220855357U - Device for shaping Gaussian beam into point ring beam - Google Patents
Device for shaping Gaussian beam into point ring beam Download PDFInfo
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- CN220855357U CN220855357U CN202322572701.XU CN202322572701U CN220855357U CN 220855357 U CN220855357 U CN 220855357U CN 202322572701 U CN202322572701 U CN 202322572701U CN 220855357 U CN220855357 U CN 220855357U
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- 239000005350 fused silica glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a device for shaping Gaussian beams into point ring beams, which comprises a collimating lens group and a central opening beam expander group, wherein the central opening beam expander group is connected to the rear end of the collimating lens group, the incident Gaussian beams are injected into the collimating lens group to form the collimated beams, and the collimated beams are injected into the central opening beam expander group to form the point ring beams. The method is implemented by a practical device. The device has simple structure, can replace the existing annular facula laser, has low component requirement and can greatly reduce hardware cost; the utility model expands the application scene of the annular light spot in the field of laser welding with low power, is applicable to 300W-4000W power scenes, is especially applicable to 800W-1500W medium power scenes, and can improve the yield and efficiency of laser welding.
Description
Technical Field
The utility model relates to the field of laser application, in particular to a device for shaping a Gaussian beam into a spot ring beam.
Background
The spot ring beam comprises a ring beam and a spot beam positioned at the center of the ring beam, compared with the traditional common laser welding and double-beam welding, the spot ring beam welding can eliminate splashing and undercut phenomena generated by welding, effectively reduce cracks and air holes, and obtain a welding seam with high strength and good uniformity.
In the prior art, the utility model patent with the authority number of CN115592263B adopts a flat conical mirror to realize the spot ring beam, so that the processing precision requirement of an optical device is extremely high, and the precision limit of the existing optical processing equipment is exceeded. The included angle between the flat top surface of the conical mirror and the bus is difficult to further reduce, the size of the annular spot of the point cannot be accurately controlled, and especially the annular spot beam with the diameter of less than 0.8mm is generated; in addition, the utility model patent with publication numbers of CN116079229A and CN115453767A adopts the DOE (diffractive optical element) scheme to realize the spot ring laser distribution, and the damage threshold is lower due to the limitation of a DOE self-diffraction unit and a micro-nano processing technology, and the spot ring laser distribution cannot be applied to lasers with the power of more than 1000W.
Disclosure of utility model
In order to overcome the defects of the prior art, the utility model provides a device for shaping a Gaussian beam into a point-ring beam, which replaces the existing annular light spot laser and greatly reduces hardware cost; and the application scene of the annular light spot in the low-power field of laser welding is expanded, and the yield and the efficiency are improved.
The technical scheme provided by the utility model is as follows:
The device for shaping the Gaussian beam into the spot ring beam comprises a collimating lens group and a central opening beam-expanding lens group, wherein the central opening beam-expanding lens group is connected to the rear end of the collimating lens group, the incident Gaussian beam is injected into the collimating lens group to form the collimated beam, and the collimated beam is injected into the central opening beam-expanding lens group to form the spot ring beam.
As a further improvement of the technical scheme, the collimating lens group comprises a first collimating lens, a second collimating lens and a third collimating lens, wherein the first collimating lens and the third collimating lens adopt plano-convex lenses, the second collimating lens adopts plano-concave lenses, and Gaussian beams are sequentially emitted into the first collimating lens, the second collimating lens and the third collimating lens to form collimated beams.
As a further improvement of the above technical solution, the collimating lens group further includes a first adjusting knob, and the first adjusting knob is used for adjusting a distance between the second collimating lens and the first collimating lens, so as to adjust a diameter of the collimated light beam.
As a further improvement of the technical scheme, the center hole beam expander group comprises a center hole spectroscope and a center hole beam expander, the center hole spectroscope adopts a plane concave lens with a center hole, the center hole beam expander adopts a plane convex lens with a center hole, and collimated light beams are sequentially emitted into the center hole spectroscope and the center hole beam expander to form point ring light beams.
As a further improvement of the technical scheme, the center hole beam expander group further comprises a second adjusting knob, and the second adjusting knob is used for driving the center hole beam expander to move so as to change the distance between the center hole spectroscope and the center hole beam expander and realize the adjustment of the size of the annular beam in the spot ring beam.
As a further improvement of the technical scheme, the center hole beam expander group comprises a center hole reflector, a first beam expander, a second beam expander, a first reflector and a second reflector, the center hole reflector is provided with a first reflector and a second reflector, a part of the collimated light beam emitted by the collimating lens group penetrates through a center hole of the center hole beam expander group to form a punctiform light beam, and the other part of the collimated light beam emitted by the collimating lens group sequentially passes through the first reflector, the first beam expander, the first reflector, the second beam expander and the second reflector to form an annular light beam, and the punctiform light beam and the annular light beam are combined to form the punctiform annular light beam.
As a further improvement of the technical scheme, the center hole beam expander group further comprises a third adjusting knob, and the third adjusting knob is used for driving the second beam expander to move so as to change the relative distance between the second beam expander and the first beam expander and realize the adjustment of the size of the annular beam.
As a further improvement of the technical scheme, the collimating lens group and the central opening beam expander group are connected with a cooling module, and the cooling module is used for reducing the temperature of lenses in the collimating lens group and the central opening beam expander.
The beneficial effects of the utility model are as follows: 1. the device can replace the existing annular light spot laser, has simple structure and low component requirement, and can greatly reduce hardware cost; 2. the application scene of the annular light spot in the field of laser welding with low power is expanded, the method is applicable to 300W-4000W power scenes, is particularly applicable to 800W-1500W medium power scenes, and the yield and the efficiency of laser welding can be improved.
Drawings
The utility model will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a device for shaping gaussian beam into a spot ring beam according to embodiment 1 of the present utility model;
FIG. 2 is a schematic view showing light propagation of the device in example 1 of the present utility model;
FIG. 3 is a schematic view of spot ring beam forming light spot in embodiment 1 of the present utility model;
FIG. 4 is a schematic diagram of the apparatus for shaping Gaussian beam into spot ring beam according to embodiment 2 of the invention;
FIG. 5 is a schematic view showing light propagation of the device in example 2 of the present invention;
FIG. 6 is a schematic diagram of spot ring beam forming in embodiment 2 of the present invention;
FIG. 7 is a front view of a first adjustment knob in an embodiment of the invention;
FIG. 8 is a cross-sectional view of A-A of FIG. 7;
fig. 9 is a schematic structural view of an apparatus for shaping a gaussian beam into a spot ring beam according to embodiment 3 of the present invention;
fig. 10 is a front view of a third adjustment knob in an embodiment of the invention.
Reference numerals: 1. a housing; 2. a first collimating mirror; 3. a second collimating mirror; 4. a third collimating mirror; 5. a first adjustment knob; 51. a first lug; 52. a second lug; 6. a center-perforated beam splitter; 7. a beam expander with a central hole; 8. a second adjustment knob; 9. a center aperture mirror; 91. a first reflecting surface; 92. a second reflecting surface; 10. a first beam expander; 11. a first mirror; 12. a second mirror; 13. a second beam expander; 14. a third adjustment knob; 141. a first fixed block; 142. a spring; 143. a slide block; 144. an adjusting rod; 145. and a second fixed block.
Detailed Description
The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.
Embodiment 1, referring to fig. 1, a device for shaping a gaussian beam into a spot ring beam includes a housing 1, a collimating lens group and a central aperture beam expander group mounted in the housing 1, wherein the central aperture beam expander group is connected to the rear end of the collimating lens group, an incident gaussian beam is incident on the collimating lens group to form a collimated beam, and the collimated beam is incident on the central aperture beam expander group to form a spot ring beam.
In a specific embodiment, referring to fig. 1 and fig. 2, the collimating lens group includes a first collimating lens 2, a second collimating lens 3 and a third collimating lens 4, the first collimating lens 2 and the third collimating lens 4 adopt plano-convex lenses, the second collimating lens 3 adopts plano-concave lenses, and the gaussian beam sequentially passes through the first collimating lens 2, the second collimating lens 3 and the third collimating lens 4 and is collimated into parallel light, so as to obtain a collimated beam.
Further, the collimating lens group further includes a first adjusting knob 5, the first adjusting knob 5 is used for adjusting the distance between the second collimating lens 3 and the first collimating lens 2 to adjust the diameter of the collimated light beam, specifically, in this embodiment, referring to fig. 7 and fig. 8, the housing 1 is located between the first collimating lens 2 and the second collimating lens 3, that is, the housing 1 is divided into two parts, and the two parts of the housing 1 are connected by the first adjusting knob 5, the first adjusting knob 5 is provided with a first lug 51, the housing 1 is provided with a second lug 52, and the second lug 52 is screwed on the inner side of the first lug 51, so that the first adjusting knob 51 is screwed to adjust the amount of the connecting part between the first lug 51 and the second lug 52, thereby adjusting the distance between the first collimating lens 2 and the second collimating lens 3. In other embodiments, the second collimating mirror 3 is slidably mounted in the housing 1, the first adjusting knob 5 is mounted outside the housing 1, the adjusting knob is connected with the second collimating mirror 3 through a jackscrew, and when the first adjusting knob 5 is rotated, the jackscrew is driven to move under the action of the thread, so as to push the second collimating mirror 3 to slide in the housing 1. Furthermore, the second collimating mirror 3 is fixed in a mounting ring, the mounting ring is slidably connected with the inner wall of the housing 1, one end of the jackscrew is rotatably connected with the mounting block, so that the mounting ring can be driven to slide when the jackscrew is rotated, and the first collimating mirror 2 is driven to move, so that the distance between the second collimating mirror 3 and the first collimating mirror 2 is adjusted, the diameter of the collimated light beam is adjusted, and the diameter of the collimated light beam is preferably adjusted to be 8-16mm.
In a specific embodiment, referring to fig. 1 and fig. 2, the central aperture beam expander group includes a central aperture spectroscope 6 and a central aperture beam expander 7, the central aperture spectroscope 6 adopts a plano-concave lens with a central aperture, the central aperture beam expander 7 adopts a plano-convex lens with a central aperture, the material adopts fused quartz, the surface is coated with an antireflection film, the light transmittance is greater than 99%, the surface roughness is 1-2nm, and the chamfer angle of the edge of the central aperture is less than 0.2mm. The collimated light beam emitted from the third collimating mirror 4 is incident on the center aperture beam splitter 6, the center light beam propagates in parallel, the edge light beam is split and expanded by the center aperture beam splitter 6, then the center light beam continues to propagate in parallel and the edge light beam is re-collimated into parallel light, thereby forming a spot ring light beam.
Further, the central hole beam expander group further comprises a second adjusting knob 8, and the second adjusting knob 8 is used for driving the central hole beam expander 7 to move so as to change the distance between the central hole beam expander 7 and the central hole beam splitter 6, and the size of the annular beam in the spot ring beam is adjusted. The principle, structure and mode of the second adjusting knob 8 driving the central hole beam expander 7 to move are the same as those of the first adjusting knob 5, and will not be described again here.
In the preferred embodiment, a cooling module is further disposed in the housing 1, and the cooling module adopts a circulating cooling water pipe structure, and the circulating cooling water pipe is in contact with the collimating lens group and the lenses (the first collimating lens 2, the second collimating lens 3, the third collimating lens 4, the central aperture spectroscope 6 and the central aperture beam expander 7) of the central aperture beam expander group, so that heat on the lenses can be taken away, and the temperature of the lenses is reduced.
In this embodiment, a gaussian beam emitted by a laser is incident into a collimating lens group, and the incident gaussian beam sequentially passes through a first collimating lens 2, a second collimating lens 3 and a third collimating lens 4 in the collimating lens group to form a collimated beam; the collimated light beam obtained through the collimating lens group is injected into the central opening beam expander lens group, and the injected collimated light beam sequentially passes through the central opening spectroscope 6 and the central opening beam expander lens 7 of the central opening beam expander lens group to form a spot ring light beam; the distance between the first collimating lens 2 and the second collimating lens 3 in the collimating lens group and the distance between the central hole beam expander 7 and the central hole beam splitter 6 in the central hole beam expander group are adjusted to adjust the size of the spot ring beam, the diameter of the central spot beam of the spot ring beam is adjustable within the range of 30-100 mu m, and the diameter of the edge ring beam is adjustable within the range of 100-800 mu m.
The adjustment mode of the spot ring beam diameter is as follows:
1. The second collimator lens 3 moves to the right side away from the first collimator lens 2, the central aperture beam expander 7 moves to the right side away from the central aperture beam splitter 6, the central point beam diameter becomes larger, the edge ring beam width becomes narrower, and the adjusted point ring beam is irradiated on the obtained light spot on the workbench as shown in fig. 3 a.
2. The second collimator 3 moves to the left, the central aperture beam expander 7 moves to the left, the central spot beam diameter becomes smaller, the edge ring beam width becomes wider, and the spot of the adjusted spot ring beam on the workbench is shown as b in fig. 3.
3. The second collimating mirror 3 continues to move leftwards to be close to the first collimating mirror 2, the center aperture beam splitter 6 and the center aperture beam expander 7 are relatively motionless, the diameter of the center point beam is reduced, the diameter of the edge ring beam is reduced, the width of the edge ring beam is unchanged, and the adjusted point ring beam is irradiated on a light spot obtained on a workbench, as shown in figure 3 c.
Embodiment 2, referring to fig. 4, a device for shaping a gaussian beam into a spot ring beam includes a housing 1, a collimating lens group and a central aperture beam expander group mounted in the housing 1, wherein the central aperture beam expander group is connected to the rear end of the collimating lens group, an incident gaussian beam is incident on the collimating lens group to form a collimated beam, and the collimated beam is incident on the central aperture beam expander group to form a spot ring beam.
The collimating lens group of this embodiment has the same structure as that of the collimating lens group of embodiment 1, and will not be described in detail, but differs from embodiment 1 in the structure of the central opening beam expander lens group.
In a specific embodiment, referring to fig. 4, the central aperture beam expander group includes a central aperture mirror 9, a first beam expander 10, a second beam expander 13, a first mirror 11 and a second mirror 12, the central aperture mirror 9 has a first reflecting surface 91 and a second reflecting surface 92, the central aperture mirror 9, the first mirror 11 and the second mirror 12 use metal structural members (preferably red copper), the first reflecting surface 91, the second reflecting surface 92 and the reflecting surfaces of the first mirror 11 and the second mirror 12 are plated with metal high reflecting films, the high reflecting film material is preferably gold or silver, the reflectivity is greater than 97%, and the surface roughness is 10 μm; the first beam expander 10 adopts a plano-concave lens, and the second beam expander 13 adopts a plano-convex lens.
Referring to fig. 5, a central point beam of the collimated beam emitted by the collimating lens group propagates in parallel through a central hole of the central hole reflector 9, an edge beam of the collimated beam emitted by the collimating lens group sequentially passes through the first reflecting surface 91, the first beam expander 10, the first reflecting mirror 11, the second reflecting mirror 12, the second beam expander 13 and the second reflecting surface 92 to form an annular beam, the point beam and the annular beam form a point ring beam, specifically, the edge beam is reflected by the first reflecting surface 91 and then enters the first beam expander 10, is split and expanded by the first beam expander 10 and then enters the first reflecting mirror 11, is reflected by the first reflecting mirror 11 and the second reflecting mirror 12 and then enters the second beam expander 13, is collimated and parallel by the second beam expander 13 and then enters the second reflecting surface 92, and finally is combined with the parallel propagating central point beam to form the point ring beam.
Further, the central hole beam expander group in this embodiment further includes a third adjusting knob 14, where the third adjusting knob 14 is used to drive the second beam expander 13 to move, so as to change a distance between the second beam expander 13 and the first beam expander 10, and implement adjustment of a size of the annular beam in the spot ring beam. The principle, structure and mode of the third adjusting knob 14 driving the second beam expander 13 to move are the same as those of the first adjusting knob 5, and will not be described here again.
In the preferred embodiment, a cooling module is further disposed in the housing 1, and the cooling module adopts a circulating cooling water pipe structure, and the circulating cooling water pipe is in contact with the collimating lens group and the lenses (the first collimating lens 2, the second collimating lens 3, the third collimating lens 4, the central aperture reflecting lens 9, the first beam expanding lens 10, the second beam expanding lens 13, the first reflecting lens 11 and the second reflecting lens 12) of the central aperture beam expanding lens group, so that heat on the lenses can be taken away, and the temperature of the lenses is reduced.
In this embodiment, the gaussian beam emitted by the laser is incident into the collimating lens group, and the incident gaussian beam sequentially passes through the first collimating lens 2, the second collimating lens 3 and the third collimating lens 4 in the collimating lens group to form a collimated beam; the collimated light beam obtained by the collimating lens group is injected into the central hole beam expander lens group, the central point light beam of the collimated light beam passes through the central hole of the central hole reflector 9 to be transmitted in parallel, and the edge light beam of the collimated light beam sequentially passes through the first reflecting surface 91, the first beam expander lens 10, the first reflecting mirror 11, the second reflecting mirror 12, the second beam expander lens 13 and the second reflecting surface 92 of the central hole beam expander lens group and then is combined with the central point light beam to form a point ring light beam; the distance between the first collimating lens 2 and the second collimating lens 3 in the collimating lens group is adjusted through the first adjusting knob 5, and the light propagation distance between the first beam expander 10 and the second beam expander 13 of the central hole beam expander group is adjusted through the third adjusting knob 14, so that the size of the spot ring light beam is adjusted, the diameter of the central spot light beam of the spot ring light beam is adjustable within the range of 30-100 mu m, and the diameter of the edge ring light beam is adjustable within the range of 100-800 mu m.
The adjustment mode of the spot ring beam diameter is as follows:
1. The second collimator lens 3 moves to the right, away from the first collimator lens 2, the second beam expander 13 moves downward, the distance between the second beam expander 13 and the first beam expander 10 is increased, the diameter of the central point beam is increased, the diameter of the edge ring beam is increased, the width of the edge ring beam is narrowed, and the obtained spot of the adjusted point ring beam on the workbench is shown in fig. 6 d.
2. The second collimator lens 3 moves to the left, the second beam expander 13 moves upwards, the distance between the second beam expander 13 and the first beam expander 10 is reduced, the diameter of the central spot beam is reduced, the diameter of the edge ring beam is reduced, the width of the edge ring beam is widened, and the spot ring beam obtained after adjustment is irradiated on the workbench is shown as e in fig. 6.
3. The second collimator 3 continues to move leftwards to be close to the first collimator 2, the second beam expander 13 is relatively fixed with the first beam expander 10, the diameter of the central point beam is reduced, the diameter of the edge ring beam is reduced, the width of the edge ring beam is unchanged, and the obtained spot of the adjusted point ring beam is shown as f in fig. 6.
Embodiment 3 differs from embodiment 2 in that the structure of the third adjusting knob 14 is different, referring to fig. 9 and 10, in this embodiment, the third adjusting knob 14 includes a first fixing block 141 and a second fixing block 142 fixed on the outer wall of the housing 1, and further includes a sliding block 143 slidably connected to the outer wall of the housing 1, the sliding block 143 is located between the first fixing block 141 and the second fixing block 142, a spring 142 is connected between the first fixing block 141 and the sliding block 143, an adjusting rod 144 is screwed on the second fixing block 142, and one end of the adjusting rod 144 is rotatably connected with the sliding block 143, so that when the adjusting rod 144 is screwed, the sliding block 143 can be driven to slide, and the sliding block 143 can be reset better under the action of the spring 142. In addition, the second beam expander 13 is slidably connected to the inside of the housing 1 through a slip ring, the slip ring is connected with the slide block 143 through a connecting rod, an avoidance port for avoiding the connecting rod is formed in the housing 1, the size of the slide block 143 is far greater than that of the avoidance port, and therefore the avoidance port is always shielded when the slide block 143 slides. Through the arrangement, when the adjusting rod 144 is screwed to drive the sliding block 143 to slide, the sliding ring can be driven to move, so that the position of the second beam expander 13 is adjusted.
While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and the equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.
Claims (8)
1. The device for shaping the Gaussian beam into the spot ring beam is characterized by comprising a collimating lens group and a central hole beam expanding lens group, wherein the central hole beam expanding lens group is connected to the rear end of the collimating lens group, the incident Gaussian beam is injected into the collimating lens group to form the collimated beam, and the collimated beam is injected into the central hole beam expanding lens group to form the spot ring beam.
2. The device of claim 1, wherein the collimating lens group comprises a first collimating lens, a second collimating lens and a third collimating lens, the first collimating lens and the third collimating lens adopt plano-convex lenses, the second collimating lens adopts plano-concave lenses, and the gaussian beam sequentially enters the first collimating lens, the second collimating lens and the third collimating lens to form a collimated beam.
3. The apparatus of claim 2, wherein the collimating lens group further comprises a first adjustment knob for adjusting a distance between the second collimating lens and the first collimating lens to adjust a diameter of the collimated light beam.
4. The apparatus of claim 3, wherein the central aperture beam expander group comprises a central aperture beam splitter and a central aperture beam expander, the central aperture beam splitter employs a central aperture plano-concave lens, the central aperture beam expander employs a central aperture plano-convex lens, and the collimated beam sequentially enters the central aperture beam splitter and the central aperture beam expander to form a spot ring beam.
5. The apparatus of claim 4, wherein the central aperture beam expander group further comprises a second adjustment knob for driving the central aperture beam expander to move to change a distance between the central aperture beam splitter and the central aperture beam expander, thereby adjusting a size of the annular beam in the spot ring beam.
6. The device of claim 3, wherein the central aperture beam expander group comprises a central aperture reflector, a first beam expander, a second beam expander, a first reflector and a second reflector, the central aperture reflector has a first reflecting surface and a second reflecting surface, a part of the collimated beam emitted by the collimating lens group passes through a central hole of the central aperture beam expander group to form a spot beam, and the other part of the collimated beam emitted by the collimating lens group sequentially passes through the first reflecting surface, the first beam expander, the first reflector, the second beam expander and the second reflecting surface to form an annular beam, and the spot beam and the annular beam are combined to form the spot ring beam.
7. The apparatus of claim 6, wherein the central aperture beam expander group further comprises a third adjustment knob for driving the second beam expander to move to change a light propagation distance between the second beam expander and the first beam expander, thereby realizing adjustment of the size of the annular beam.
8. The apparatus of claim 1, wherein the collimating lens group and the central aperture beam expander group are each connected to a cooling module for reducing the lens temperature in the collimating lens group and the central aperture beam expander.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322572701.XU CN220855357U (en) | 2023-09-21 | 2023-09-21 | Device for shaping Gaussian beam into point ring beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322572701.XU CN220855357U (en) | 2023-09-21 | 2023-09-21 | Device for shaping Gaussian beam into point ring beam |
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| Publication Number | Publication Date |
|---|---|
| CN220855357U true CN220855357U (en) | 2024-04-26 |
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| CN202322572701.XU Active CN220855357U (en) | 2023-09-21 | 2023-09-21 | Device for shaping Gaussian beam into point ring beam |
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| CN (1) | CN220855357U (en) |
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- 2023-09-21 CN CN202322572701.XU patent/CN220855357U/en active Active
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