Light path structure of point annular light spot shaper

Abstract

The utility model discloses a light path structure of a point annular light spot shaper, which comprises a laser device, a collimating mirror, a reflecting mirror, a central opening beam expanding mirror group, a focusing mirror, a reflecting mirror adjusting assembly, a collimating mirror adjusting assembly and a central opening beam expanding mirror group adjusting assembly, the collimated light beam passes through the center opening beam expanding lens group to form a point ring light beam, and the point ring light beam passes through the focusing lens and then acts on a working surface to form a point ring light spot; the reflector adjusting assembly is used for adjusting the inclination angle of the reflector, the collimating mirror adjusting assembly is used for adjusting the position of the collimating mirror in the X-axis direction, and the center-opening beam expanding mirror set adjusting assembly is used for adjusting the position of the center-opening beam expanding mirror set in the Y-axis direction. Therefore, the concentricity and the parallelism of the incident collimated light beam relative to the central opening beam expanding lens group can be adjusted, and ideal and uniform light spots can be obtained.

Description

Technical Field

[0001] The utility model relates to the field of laser applications, and particularly to an optical path structure of a spot-annular light spot shaper. Background Art

[0002] The spot-annular beam includes an annular beam and a spot beam located at the center of the annular beam. Compared with traditional ordinary laser welding and double-beam welding, spot-annular beam welding can eliminate the spatter and undercut phenomena generated during welding, effectively reduce cracks and pores, and obtain welds with high strength and good uniformity.

[0003] In the prior art, for example, the invention patent with the authorization number CN115592263B uses a plano-conical mirror to realize a spot-annular beam, which has extremely high requirements for the processing accuracy of optical devices, exceeding the accuracy limit of existing optical processing equipment. It is difficult to further reduce the angle between the flat top surface and the generatrix of the conical mirror, and it is impossible to precisely control the size of the spot-annular light spot, especially to generate a spot-annular beam with a diameter of less than 0.8 mm. In addition, the invention patents with the publication numbers CN116079229A and CN115453767A use the DOE (diffractive optical element) scheme to realize the spot-ring laser distribution. Due to the limitations of the DOE's own diffraction units and micro-nano processing technology, the damage threshold is relatively low, and it cannot be applied to lasers above 1000W.

[0004] To solve the above problems, the inventor proposed the technical solution in the utility model patent with the authorization publication number CN 220855357 U. However, in actual use, the inventor also found the following problems with this technical solution:

[0005] 1. The concentricity and parallelism problems existing when the collimated light enters the center-opening beam expander group are not considered. The concentricity problem will cause the spot-annular light spot to be incomplete and uneven, and the parallelism problem will cause stray light phenomena.

[0006] 2. The collimating lens group and the center-opening beam expander group use adjustment knobs to change the distance between the lenses, thereby changing the spot size to generate different combinations of spot-annular light spots. After integrating this adjustment structure, the optical path is relatively complex, the volume is large, and the cost is high. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, the utility model provides an optical path structure of a spot-annular light spot shaper to solve the concentricity and parallelism problems of the incident collimated light relative to the center-opening beam expander group, and can obtain an ideal and uniform light spot.

[0008] An optical path structure of a dot-ring-shaped light spot shaper, comprising a laser, a collimating mirror, a reflecting mirror, a center-aperture beam expander group and a focusing mirror. The laser beam emitted by the laser forms a collimated beam through the collimating mirror. The collimated beam is reflected by the reflecting mirror and then enters the center-aperture beam expander group. The collimated beam forms a dot-ring beam through the center-aperture beam expander group. The dot-ring beam acts on the working surface through the focusing mirror and forms a dot-ring-shaped light spot.

[0009] It further includes a reflecting mirror adjustment component, a collimating mirror adjustment component and a center-aperture beam expander group adjustment component. The reflecting mirror adjustment component is used to adjust the tilt angle of the reflecting mirror to adjust the concentricity of the incident collimated beam relative to the center-aperture beam expander group. The collimating mirror adjustment component is used to adjust the position of the collimating mirror in the X-axis direction, and the center-aperture beam expander group adjustment component is used to adjust the position of the center-aperture beam expander group in the Y-axis direction to adjust the concentricity of the incident collimated beam relative to the center-aperture beam expander group.

[0010] As a further improvement of the above technical solution, the reflecting mirror adjustment component includes a reflecting mirror mounting seat, a reflecting mirror bracket connected to the reflecting mirror mounting seat, and an angle adjustment member provided on the reflecting mirror adjustment block. The reflecting mirror is mounted on the reflecting mirror bracket, and the angle adjustment member is used to adjust the tilt angle of the reflecting mirror bracket.

[0011] As a further improvement of the above technical solution, the angle adjustment member includes a reflecting mirror adjustment block, a ball and an adjustment screw pair. The reflecting mirror adjustment block is fixedly connected to the reflecting mirror mounting seat. The ball is connected between the reflecting mirror adjustment block and the reflecting mirror bracket. The reflecting mirror adjustment block and the reflecting mirror bracket are rotatably arranged relative to the ball. There are two adjustment screw pairs, and the two adjustment screw pairs are arranged at one pair of corners of the reflecting mirror adjustment block, and the output ends of the adjustment screw pairs abut against the reflecting mirror bracket.

[0012] As a further improvement of the above technical solution, a first ball mounting hole is provided on one side of the reflecting mirror adjustment block close to the reflecting mirror bracket, and a second ball mounting hole is provided on one side of the reflecting mirror bracket close to the reflecting mirror adjustment block. One side of the ball is accommodated in the first ball mounting hole, and the other side of the ball is accommodated in the second ball mounting hole.

[0013] As a further improvement of the above technical solution, an elastic member is provided between the reflecting mirror adjustment block and the reflecting mirror bracket, and the elastic member is used to provide an elastic force to drive the reflecting mirror bracket to move back to its original position.

[0014] As a further improvement of the above technical solution, the elastic member includes two springs, and the two springs are respectively arranged close to the two adjustment screw pairs. One end of the spring is connected to the mirror adjustment block, and the other end of the spring is connected to the mirror bracket.

[0015] As a further improvement of the above technical solution, spring mounting holes are provided on both the mirror adjustment block and the mirror bracket, and needle roller pin mounting grooves are provided at the mutually facing ends of the two spring mounting holes. Hook pins are respectively inserted through the hooks at both ends of the spring, and the needle roller pins are accommodated in the needle roller pin mounting grooves.

[0016] As a further improvement of the above technical solution, the mirror mounting seat is in an L shape, the mirror is located at the inflection point of the mirror mounting seat, the collimator is connected to one end of the mirror mounting seat through a collimator adjustment block, the central opening beam expander group is connected to the other end of the mirror mounting seat through an opening beam expander group adjustment block, the central opening beam expander group includes an opening concave mirror and an opening convex mirror, and the opening concave mirror and the opening convex mirror are mounted at both ends of the opening beam expander group adjustment block.

[0017] As a further improvement of the above technical solution, water cooling structures are provided at both ends of the opening beam expander mounting seat. The water cooling structure includes three water cooling channels provided inside the opening beam expander group adjustment block. The three water cooling channels are connected in communication, and one end of each water cooling channel penetrates through the opening beam expander group adjustment block. A plug is connected to the opening of one of the water cooling channels, and pipe joints are connected to the openings of the other two water cooling channels.

[0018] As a further improvement of the above technical solution, the collimator adjustment assembly includes a first adjustment groove provided on the mirror mounting seat. The two ends of the mirror mounting seat are respectively provided with a first adjustment groove and a second adjustment groove. The collimator adjustment block is slidably connected in the first adjustment groove, and a first stop screw is connected between the collimator adjustment block and the mirror mounting seat;

[0019] The opening beam expander group adjustment assembly includes a second adjustment groove provided on the mirror mounting seat. The opening beam expander group adjustment block is slidably connected in the second adjustment groove, and a second stop screw is connected between the opening beam expander group adjustment block and the mirror mounting seat;

[0020] The second stop screw and the first stop screw are perpendicularly arranged.

[0021] The beneficial effects of the present utility model are as follows: By adjusting the concentricity and parallelism of the incident collimated light beam relative to the central opening beam expander group through the mirror and the mirror adjustment assembly, an ideal and uniform light spot can be obtained, and the structure is simple, easy to adjust, and the cost is low. Brief Description of the Drawings

[0022] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the optical path for shaping a dot-ring-shaped light spot of the present utility model;

[0024] Figure 2 It is a schematic diagram of a light spot with a reduced aperture of the central-aperture beam expander group of the present utility model;

[0025] Figure 3 It is a schematic diagram of a light spot with an increased aperture of the central-aperture beam expander group of the present utility model;

[0026] Figure 4 It is an assembly schematic diagram of the optical path structure of the dot-ring-shaped light spot shaper in the embodiment of the present utility model;

[0027] Figure 5 It is a top view of the optical path structure of the dot-ring-shaped light spot shaper in the embodiment of the present utility model;

[0028] Figure 6 It is Figure 5 a cross-sectional view taken along A-A in

[0029] Figure 7 It is Figure 5 a cross-sectional view taken along B-B in

[0030] Figure 8 It is an assembly schematic diagram of the mirror adjustment assembly in the embodiment of the present utility model;

[0031] Figure 9 It is an exploded schematic diagram of the structure of the mirror adjustment assembly in the embodiment of the present utility model;

[0032] Figure 10 It is an assembly schematic diagram of the spring in the embodiment of the present utility model;

[0033] Figure 11 It is a schematic diagram of the structure of the mirror mounting seat in the embodiment of the present utility model.

[0034] Reference signs: 1, laser; 2, collimating mirror; 3, reflecting mirror; 4, concave mirror with an opening; 5, convex mirror with an opening; 6, focusing mirror; 7, working surface; 8, reflecting mirror mounting base; 81, first adjustment groove; 82, second adjustment groove; 83, first stop screw; 84, second stop screw; 9, angle adjustment member; 91, reflecting mirror adjustment block; 92, reflecting mirror bracket; 93, ball; 94, adjustment screw pair; 95, spring; 96, spring mounting hole; 97, needle pin mounting groove; 98, needle pin; 10, collimating mirror adjustment block; 11, opening beam expander group adjustment block; 12, water cooling channel; 13, plug mounting port; 14, pipe joint mounting port. Detailed implementation manners

[0035] The concept, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present utility model. In addition, all the connection / connection relationships involved in the patent do not refer only to the direct connection of components, but refer to the more optimal connection structure that can be formed by adding or reducing connection accessories according to the specific implementation situation. For example, fixed connection / fixed installation can select screw connection, bolt connection, pin connection, key connection, bonding, mortise and tenon connection, welding, riveting, etc. as needed. For example, detachable connection can select screw connection, bolt connection, threaded connection, snap connection, mortise and tenon connection, magic tape connection, etc. as needed. Each technical feature in the creation of the present utility model can be combined interactively without conflicting with each other.

[0036] Referring to Figure 1 , an embodiment of the present utility model discloses an optical path structure of a point-ring-shaped light spot shaper, including a laser 1, a collimating mirror 2, a reflecting mirror 3, a central opening beam expander group, a focusing mirror 6 and a reflecting mirror adjustment assembly. The laser beam emitted by the laser 1 forms a collimated beam through the collimating mirror 2. The collimated beam is reflected by the reflecting mirror 3 and then enters the central opening beam expander group. The collimated beam forms a point-ring beam through the central opening beam expander group. The point-ring beam acts on the working surface 7 through the focusing mirror 6 and forms a point-ring-shaped light spot. Among them, the central opening beam expander group includes a concave mirror with an opening 4 and a convex mirror with an opening 5. The collimated beam passes through the concave mirror with an opening 4 and the convex mirror with an opening 5 in sequence to form a point-ring beam. By replacing the concave mirror with an opening 4 and the convex mirror with an opening 5 with different apertures, the adjustment of the point-ring-shaped light spot is realized. The point-ring-shaped light spots formed after replacing the concave mirror with an opening 4 and the convex mirror with an opening 5 with a small aperture or a large aperture are as Figure 2 and Figure 3 shown.

[0037] In this embodiment, the mirror adjusting assembly is used to adjust the tilt angle of the mirror 3, so as to change the parallelism of the incident collimated light beam relative to the central aperture beam expander group, avoiding the situation of stray light caused by the parallelism problem, and thus an ideal and uniform light spot can be obtained.

[0038] In some embodiments, referring to Figures 4 - 6 , the mirror adjusting assembly includes a mirror mounting base 8, a mirror bracket member 92 connected to the mirror mounting base 8, and an angle adjusting member 9 provided on the mirror adjusting block 91. The mirror 3 is mounted on the mirror bracket member 92 by glue screws. The mirror mounting base 8 is in an L shape, and the mirror 3 is located at the inflection point of the mirror mounting base 8. The collimator 2 is connected to one end of the mirror mounting base 8 through a collimator adjusting block 10, and the central aperture beam expander group is connected to the other end of the mirror mounting base 8 through an aperture beam expander group adjusting block 11. Moreover, the aperture concave mirror 4 and the aperture convex mirror 5 are mounted at both ends of the aperture beam expander group adjusting block 11. In this way, the collimator 2, the mirror 3, the aperture concave mirror 4 and the aperture convex mirror 5 are assembled together to form a shaper, compressing the structural volume of the shaper and reducing the cost.

[0039] Furthermore, referring to Figure 11 , the collimator adjusting assembly includes a first adjusting groove 81 provided on the mirror mounting base 8. The collimator adjusting block 10 is slidably connected in the first adjusting groove 81, and a first set screw 83 is connected between the collimator adjusting block 10 and the mirror mounting base 8. The aperture beam expander group adjusting assembly includes a second adjusting groove 82 provided on the mirror mounting base 8. The aperture beam expander group adjusting block 11 is slidably connected in the second adjusting groove 82, and a second set screw 84 is connected between the aperture beam expander group adjusting block 11 and the mirror mounting base 8. The second set screw 84 and the first set screw 83 are perpendicularly arranged. That is, rotating the first set screw 83 can push the collimator adjusting block 10 to move in the X-axis direction, changing the position of the incident collimated light beam in the X direction, and rotating the second set screw 84 can push the aperture beam expander group adjusting block 11 to move in the Y-axis direction, changing the position of the incident collimated light beam in the Y direction. Under the combined action of the two, the concentricity of the incident collimated light beam relative to the central aperture beam expander group is adjusted to ensure that it passes through the center of the aperture beam expander group, avoiding the situation that the point annular light spot is incomplete and uneven due to the concentricity problem.

[0040] In the above embodiment, the angle adjusting member 9 is used to adjust the tilt angle of the mirror bracket member 92. Specifically, referring to Figure 8 and Figure 9, the angle adjusting member 9 includes a mirror adjusting block 91, a ball 93 and an adjusting screw pair 94. The mirror adjusting block 91 is fixedly connected to the mirror mounting seat 8 by screws. The ball 93 is connected between the mirror adjusting block 91 and the mirror support 92. The mirror adjusting block 91 and the mirror support 92 are rotatably arranged relative to the ball 93. There are two adjusting screw pairs 94, and the two adjusting screw pairs 94 are arranged at a pair of diagonals of the mirror adjusting block 91, and the output end of the adjusting screw pair 94 abuts against the mirror support 92. Thus, when the operating end of the adjusting screw pair 94 is rotated, the output end of the adjusting screw pair 94 will push the mirror support 92 to move away from the mirror adjusting block 91, and the mirror support 92 is restricted to rotate at the ball 93. Thus, when the output end of the adjusting screw pair 94 pushes the mirror support 92 to move, that is, the mirror support 92 rotates based on the ball 93, thereby adjusting the deflection angle of the mirror support 92. Since the two adjusting screw pairs 94 are arranged at the diagonals of the mirror adjusting block 91, operating the two adjusting screw pairs 94 can respectively adjust the deflection angles of the mirror support 92 in the X and Y axis directions, thereby realizing the adjustment of the concentricity of the incident collimated light beam relative to the central opening beam expander group.

[0041] Further, a first ball 93 mounting hole is provided on one side of the mirror adjusting block 91 close to the mirror support 92, and a second ball 93 mounting hole is provided on one side of the mirror support 92 close to the mirror adjusting block 91. One side of the ball 93 is received in the first ball 93 mounting hole, and the other side of the ball 93 is received in the second ball 93 mounting hole. Thus, the mirror support 92 can deflect relative to the mirror adjusting block 91 based on the ball 93, facilitating the adjustment of the tilt angle of the mirror support 92.

[0042] Furthermore, an elastic member is provided between the mirror adjusting block 91 and the mirror support 92. The elastic member is used to provide an elastic force to drive the mirror support 92 to move in a reset manner. Specifically, the elastic member includes two springs 95. The two springs 95 are respectively arranged close to the two adjusting screw pairs 94. One end of the spring 95 is connected to the mirror adjusting block 91, and the other end of the spring 95 is connected to the mirror support 92. The two springs 95 can support the mirror support 92, so that the mirror support 92 is connected to the mirror adjusting block 91; in addition, after the adjusting screw pair 94 drives the mirror support 92 to move, when the adjusting screw pair 94 moves in the reverse direction, the elastic force of the spring 95 drives the mirror support 92 to move in a reset manner, ensuring that the output end of the adjusting screw pair 94 and the mirror support 92 are always in an abutting state, improving the stability of the mirror support 92.

[0043] Refer to 9 and Figure 10 , spring mounting holes 96 are provided on both the mirror adjusting block 91 and the mirror bracket 92, and needle roller pin mounting grooves 97 are provided at one end of the two spring mounting holes 96 facing away from each other. Hooks at both ends of the spring 95 are each provided with a needle roller pin 98, and the needle roller pin 98 is accommodated in the needle roller pin mounting groove 97, which facilitates the installation and disassembly of the spring 95.

[0044] In some embodiments, refer to Figure 5 and Figure 7 , water cooling structures are provided at both ends of the opening beam expander mounting seat. The water cooling structure includes three water cooling channels 12 provided inside the opening beam expander group adjusting block 11. The three water cooling channels 12 are arranged along three sides of the opening beam expander group adjusting block 11, and the three water cooling channels 12 are connected in sequence. One end of each water cooling channel 12 penetrates through the opening beam expander group adjusting block 11. The opening of one of the water cooling channels 12 penetrating through the opening beam expander mounting seat is a plug mounting port 13, and a plug is connected to the plug mounting port 13. The openings of the other two water cooling channels 12 penetrating through the opening beam expander mounting seat are pipe joint mounting ports 14, and pipe joints are connected to the pipe joint mounting ports 14 and connected to an external water pipe, which facilitates the inflow and drainage of the water cooling channel 12.

[0045] The above is a specific description of the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An optical path structure of a point-annular light spot shaper, characterized in that: It includes a laser, a collimating mirror, a reflecting mirror, a beam expander group with a central aperture, and a focusing mirror. The laser beam emitted by the laser forms a collimated beam after passing through the collimating mirror. The collimated beam is reflected by the reflecting mirror and then enters the beam expander group with a central aperture. The collimated beam forms a point-ring beam after passing through the beam expander group with a central aperture. The point-ring beam acts on the working surface after passing through the focusing mirror and forms a point-ring-shaped light spot. It further includes a reflecting mirror adjustment component, a collimating mirror adjustment component, and a beam expander group with a central aperture adjustment component. The reflecting mirror adjustment component is used to adjust the tilt angle of the reflecting mirror to adjust the concentricity of the incident collimated beam relative to the beam expander group with a central aperture. The collimating mirror adjustment component is used to adjust the position of the collimating mirror in the X-axis direction. The beam expander group with a central aperture adjustment component is used to adjust the position of the beam expander group with a central aperture in the Y-axis direction to adjust the concentricity of the incident collimated beam relative to the beam expander group with a central aperture.

2. The optical path structure of a dot-ring-shaped light spot shaper according to claim 1, characterized in that: The reflecting mirror adjustment component includes a reflecting mirror mounting seat, a reflecting mirror bracket connected to the reflecting mirror mounting seat, and an angle adjustment member provided on the reflecting mirror adjustment block. The reflecting mirror is mounted on the reflecting mirror bracket, and the angle adjustment member is used to adjust the tilt angle of the reflecting mirror bracket.

3. The optical path structure of a dot-ring-shaped light spot shaper according to claim 2, characterized in that: The angle adjustment member includes a reflecting mirror adjustment block, a ball, and an adjustment screw pair. The reflecting mirror adjustment block is fixedly connected to the reflecting mirror mounting seat. The ball is connected between the reflecting mirror adjustment block and the reflecting mirror bracket. The reflecting mirror adjustment block and the reflecting mirror bracket are rotatably arranged relative to the ball. There are two adjustment screw pairs, and the two adjustment screw pairs are arranged at one pair of diagonals of the reflecting mirror adjustment block, and the output ends of the adjustment screw pairs abut against the reflecting mirror bracket.

4. The optical path structure of a dot-annular light spot shaper according to claim 3, characterized in that: A first ball mounting hole is provided on one side of the reflecting mirror adjustment block close to the reflecting mirror bracket, and a second ball mounting hole is provided on one side of the reflecting mirror bracket close to the reflecting mirror adjustment block. One side of the ball is accommodated in the first ball mounting hole, and the other side of the ball is accommodated in the second ball mounting hole.

5. The optical path structure of a point-annular light spot shaper according to claim 3, characterized in that: An elastic member is provided between the reflecting mirror adjustment block and the reflecting mirror bracket. The elastic member is used to provide an elastic force to drive the reflecting mirror bracket to move back to its original position.

6. The optical path structure of a dot-ring-shaped light spot shaper according to claim 5, characterized in that: The elastic member includes two springs. The two springs are respectively arranged close to the two adjustment screw pairs. One end of the spring is connected to the reflecting mirror adjustment block, and the other end of the spring is connected to the reflecting mirror bracket.

7. The optical path structure of a dot-ring-shaped light spot shaper according to claim 6, characterized in that: Spring mounting holes are provided on both the reflecting mirror adjustment block and the reflecting mirror bracket, and needle roller pin mounting grooves are provided at the ends of the two spring mounting holes facing away from each other. A needle roller pin is inserted through the hooks at both ends of the spring, and the needle roller pin is accommodated in the needle roller pin mounting groove.

8. An optical path structure of a point-annular light spot shaper according to any one of claims 2-7, characterized in that: The mirror mount is in an L shape, the mirror is located at the inflection point of the mirror mount, the collimator is connected to one end of the mirror mount through a collimator adjustment block, the central aperture beam expander group is connected to the other end of the mirror mount through an aperture beam expander group adjustment block, the central aperture beam expander group includes an aperture concave mirror and an aperture convex mirror, and the aperture concave mirror and the aperture convex mirror are installed at both ends of the aperture beam expander group adjustment block.

9. The optical path structure of a dot-ring-shaped light spot shaper according to claim 8, characterized in that: Water cooling structures are provided at both ends of the aperture beam expander mount. The water cooling structures include three water cooling channels provided inside the aperture beam expander group adjustment block. The three water cooling channels are connected in communication, and one end of each water cooling channel penetrates through the aperture beam expander group adjustment block. A plug is connected to the opening of one of the water cooling channels, and pipe joints are connected to the openings of the other two water cooling channels.

10. The optical path structure of a dot-ring spot shaper according to claim 8, characterized in that: The collimator adjustment assembly includes a first adjustment groove provided on the mirror mount. First adjustment grooves and second adjustment grooves are respectively provided at both ends of the mirror mount. The collimator adjustment block is slidably connected in the first adjustment groove, and a first stop screw is connected between the collimator adjustment block and the mirror mount. The aperture beam expander group adjustment assembly includes a second adjustment groove provided on the mirror mount. The aperture beam expander group adjustment block is slidably connected in the second adjustment groove, and a second stop screw is connected between the aperture beam expander group adjustment block and the mirror mount. The second stop screw is perpendicular to the first stop screw.

Images