Annular laser spot generator based on conical lens

Abstract

The invention discloses an annular laser spot generator based on a conical lens, and the key point of the technical scheme is that the annular laser spot generator comprises a laser transmitter which is used for transmitting laser; the first collimating lens group is used for carrying out collimation on the laser beam; one end of the conical tip of the conical lens faces the first collimating lens group and is used as a light beam incident end, one end of the plane of the conical lens is used as a light beam emergent end, and the conical lens is used for shaping the collimated laser beam into an annular light spot; the second collimating lens group is arranged on one side, far away from the first collimating lens group, of the conical lens, and the second collimating lens group is used for focusing the annular light spot on an image plane with a specified distance; the anti-dazzling screen is arranged on one side, far away from the conical lens, of the second collimating lens group, and the anti-dazzling screen is used for shielding stray light in the center of the shaped annular laser beam; through the arrangement that the two collimating lens sets are matched with the conical lens, the problem that the width of an annular light spot is small is solved.

Description

Technical Field

[0001] The present invention relates to a light spot generator, and more particularly to a ring-shaped laser light spot generator based on a conical lens. Background Art

[0002] With the development of laser technology, the application scenarios of laser beams are becoming more and more abundant. Annular line spots are more common in traditional marking, positioning and other fields, and belong to the application of identification and positioning. There are also special fields, such as product packaging, electronic component curing, machine vision and other fields, which require special-sized, uniform, and wide annular spots.

[0003] There are many solutions on the market for forming annular line spots, such as through diffraction gratings, conical lenses, conical mirrors, etc., but these annular spot lenses are simple to shape, the line width obtained by shaping is small, and the uniformity is poor. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a ring-shaped laser spot generator based on an aconic lens, which solves the problem of small annular spot width by setting two collimating lens groups in conjunction with an aconic lens.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a circular laser spot generator based on an aconic lens, comprising a laser emitter, wherein the laser emitter is used to emit laser light;

[0006] A first collimating lens group, wherein the first collimating lens group is used to collimate the laser beam;

[0007] An aconic lens, wherein one end of the aconic lens is arranged toward the first collimating lens group and serves as the incident end of the light beam, and one end of the plane serves as the exit end of the light beam, and the aconic lens is used to shape the collimated laser beam into an annular light spot;

[0008] A second collimator lens group, the second collimator lens group is arranged on a side of the axicon away from the first collimator lens group, and the second collimator lens group is used to focus the annular light spot on an image plane at a specified distance;

[0009] And a light shielding plate, which is arranged on the side of the second collimating lens group away from the axicon, and is used to shield the stray light in the center of the shaped annular laser beam.

[0010] The present invention is further configured to include a light homogenizer, which is arranged between the laser emitter and the first collimator lens group, and is used to homogenize the laser emitted by the laser emitter.

[0011] By adopting the above technical solution and setting the light homogenizer, the uniformity of the formed aperture is improved.

[0012] The present invention is further configured as follows: the focal length of the first collimating lens group is set to f1, f1=(r+1) / tan(w), wherein the diameter of the light beam after being homogenized by the scattering plate is 2r, and the full angle of divergence of the light beam is 2w.

[0013] The present invention is further configured such that: the cone angle of the cone lens is in the range of 90-179°.

[0014] The present invention is further configured as follows: the focal length of the second collimating lens group is set to f2, f2=(R+1)×tan(Y), wherein the diameter of the light spot size at the output end face of the conical lens is 2R, and the full angle of the annular light beam cone is 2Y.

[0015] The present invention is further configured as follows: the radius of the annular spot is D, D≈tan((n-1)×m / 2)×f2, m is the vertex angle of the conical lens, and n is the refractive index of the conical lens material.

[0016] The present invention is further configured as follows: at a specific distance L, the maximum outer radius of the annular light spot is set to P, P≈L×tan(U)+D, and the divergence angle of the light beam after shaping by the second collimator group is U≈arcsin(0.22).

[0017] The present invention is further configured as follows: it also includes a housing, in which the laser emitter, the first collimating lens group, the aconic lens, the second collimating lens group, the light homogenizing sheet and the light shielding sheet are all arranged;

[0018] The housing comprises a first component, on which a laser emitter, a light homogenizer and a first collimator lens group are arranged;

[0019] A second component part, wherein the aconic lens is arranged in the second component part;

[0020] A third component part, wherein the second collimating lens group is arranged in the third component part;

[0021] and a fourth component part, wherein the shading sheet is arranged in the fourth component part, the third component part and the fourth component part are fixedly connected together, and the distance between the first component part and the second component part, and between the second component part and the third component part are adjustable.

[0022] The present invention is further configured as follows: the first component, the second component and the third component have the same structure;

[0023] The first component includes a connection box, the cross section of which is arranged in a rectangular shape;

[0024] and a connecting pipe, wherein two connecting pipes are provided, the two connecting pipes are coaxially arranged and the two connecting pipes are respectively fixedly connected to the top and the bottom of the connection box;

[0025] An adjusting tube is arranged between the first component and the second component and between the second component and the third component. The adjusting tube is respectively sleeved on the two connecting tubes of the two adjacent components. Two sections of external threads with opposite spiral directions are arranged on the inner wall of the adjusting tube. The two sections of external threads are respectively matched with the threads of the two connecting tubes.

[0026] The two connecting tubes are provided with at least one positioning rod arranged along the axis direction of the connecting tubes. The positioning rod extends into the side walls of the two connecting tubes. The positioning rod is fixed to one of the connecting tubes, and the other connecting tube can slide on the positioning rod along the length direction of the positioning rod.

[0027] The present invention is further configured as follows: a clearance hole penetrating through the side wall of the connection box is provided on one side of the connection box, the clearance hole is configured as a rectangular hole, and the length direction of the clearance hole is parallel to the length direction of the side surface of the connection box on which the rectangular hole is provided;

[0028] A disassembly plate is provided in the connection box, one end of the disassembly plate is inserted into the connection box through the clearance hole, and the other end is exposed outside the connection box, and a matching plate matching the clearance hole is fixedly connected to the disassembly plate;

[0029] A positioning ring is provided on the inner wall of the connection box away from the clearance hole, and the end of the disassembly plate inserted into the connection box is inserted into the positioning ring and matched with the positioning ring;

[0030] Two blocking components are respectively arranged at both ends of the clearance hole, and the blocking components prevent the matching plate from being separated from the clearance hole after the disassembly plate is inserted into the connection box;

[0031] The blocking assembly comprises a fixing sleeve, which is fixedly connected to the connection box, and the length direction of the fixing sleeve is parallel to the length direction of the side surface of the connection box where the clearance hole is arranged;

[0032] A blocking rod, one end of which is inserted into the fixing sleeve from the end of the fixing sleeve close to the clearance hole and can slide in the fixing sleeve along the length direction of the fixing sleeve, and the end of the blocking rod away from the fixing sleeve can slide to the side of the clearance hole away from the positioning ring to prevent the limiting plate from detaching from the clearance hole;

[0033] An elastic member, wherein the elastic member is arranged in the fixing sleeve, and the elastic force of the elastic member is applied to the blocking rod. When the elastic member is in a normal state, the blocking rod slides away from one end of the fixing sleeve to the side where the clearance hole is away from the positioning ring;

[0034] And a pull rod, which is fixedly connected to one end of the fixing sleeve away from the clearance hole and arranged along the length direction of the fixing sleeve, and passes through the fixing sleeve in a direction away from the clearance hole.

[0035] In summary, compared with the prior art, the present invention has the following beneficial effects: the present invention solves the problem of small annular spot width by configuring two collimating lens groups in conjunction with a conical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of an axicon lens according to an embodiment;

[0037] Figure 2 is a schematic diagram of the overall structure of an embodiment;

[0038] Figure 3 is a cross-sectional view of the overall structure of the embodiment;

[0039] Figure 4 for Figure 3 A magnified schematic diagram of part A;

[0040] Figure 5 A schematic diagram of a positioning rod is shown in the embodiment;

[0041] Figure 6 FIG. 1 is a schematic diagram of a barrier assembly according to an embodiment.

[0042] In the figure: 1, laser emitter; 2, light homogenizer; 3, first collimator lens group; 4, conical lens; 5, second collimator lens group; 6, light shielding plate; 7, housing; 71, first component; 711, connecting pipe; 712, connecting box; 7121, clearance hole; 713, disassembly plate; 7131, matching plate; 714, positioning ring; 715, blocking assembly; 7151, fixing sleeve; 7152, blocking rod; 7153, elastic member; 7154, pull rod; 72, second component; 73, third component; 74, fourth component; 75, adjusting tube; 76, positioning rod. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0044] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0045] Embodiment: A ring laser spot generator based on a conical lens 4, see the attached Figure 1 -Attached Figure 6, comprising a laser emitter 1, a first collimating lens group 3, an aconic lens 4, a second collimating lens group 5 and a shading plate 6, wherein the laser emitter 1 is used to emit laser light; the first collimating lens group 3 is used to collimate the laser beam; the cone tip end of the aconic lens 4 is arranged toward the first collimating lens group 3 and serves as the incident end of the light beam, and the plane end serves as the exit end of the light beam, and the aconic lens 4 is used to shape the collimated laser beam into an annular light spot; the second collimating lens group 5 is arranged on the side of the aconic lens 4 away from the first collimating lens group 3, and the second collimating lens group 5 is used to focus the annular light spot on an image plane at a specified distance; the shading plate 6 is arranged on the side of the second collimating lens group 5 away from the aconic lens 4, and the shading plate 6 is used to shield the stray light at the center of the shaped annular laser beam.

[0046] Specifically, this embodiment further includes a light homogenizer 2 , which is disposed between the laser emitter 1 and the first collimator lens group 3 , and is used to homogenize the laser emitted by the laser emitter 1 .

[0047] The arrangement of the light homogenizer 2 makes the formed annular light spot more uniform, and the arrangement of the first collimator lens group 3 and the second collimator lens group 5 solves the problem of small annular light spot width; the arrangement of the light shielding sheet 6 can shield the stray light in the center of the annular laser beam.

[0048] Specifically, the focal length of the first collimating lens group 3 is set to f1, f1 = (r+1) / tan(w), wherein the diameter of the light beam after being homogenized by the scattering plate is 2r, and the full angle of divergence of the light beam is 2w.

[0049] Specifically, the focal length of the second collimating lens group 5 is set to f2, f2 = (R + 1) × tan (Y), wherein the diameter of the output end surface light spot of the axle lens 4 is 2R, and the full angle of the annular light beam cone is 2Y.

[0050] Specifically, the radius of the annular spot is D, D≈tan((n-1)×m / 2)×f2, m is the vertex angle of the axle lens 4, and n is the refractive index of the material of the axle lens 4.

[0051] Specifically, at a specific distance L, the maximum outer radius of the annular spot is set to P, P≈L×tan(U)+D, and the divergence angle of the light beam after shaping by the second collimator group 5 is U≈arcsin(0.22).

[0052] Specifically, the present embodiment further includes a housing 7, in which the laser emitter 1, the first collimator lens group 3, the conical lens 4, the second collimator lens group 5, the light homogenizer 2 and the light shielding sheet 6 are all arranged; the housing 7 includes a first component part 71, a second component part 72, a third component part 73 and a fourth component part 74, the laser emitter 1, the light homogenizer 2 and the first collimator lens group 3 are arranged on the first component part 71; the conical lens 4 is arranged in the second component part 72; the second collimator lens group 5 is arranged in the third component part 73; the light shielding sheet 6 is arranged in the fourth component part 74, the third component part 73 and the fourth component part 74 are fixedly connected together, and the distance between the first component part 71 and the second component part 72, and between the second component part 72 and the third component part 73 is adjustable.

[0053] By adjusting the distance between the first component 71 and the second component 72 , and between the second component 72 and the third component 73 , the focal length of the second collimating lens group 5 can be adjusted.

[0054] The first collimating lens group 3 and the second collimating lens group 5 can be configured as a plano-convex lens, a biconvex lens or a lens group

[0055] Specifically, if you want to better adjust the focal length of the first collimating lens group 3 and the second collimating lens group 5, you also need to replace the first collimating lens group 3 and the second collimating lens group 5, so as to facilitate the replacement of lenses with different focal lengths; further, in this embodiment, the conical lens 4 can also be replaced with different specifications.

[0056] Specifically, the first component 71, the second component 72 and the third component 73 have the same structure. This embodiment is described by taking the first component 71 as an example. The first component 71 includes a connection box 712 and a connection pipe 711. The cross section of the connection box 712 is set to be rectangular. Two connection pipes 711 are provided. The two connection pipes 711 are coaxially arranged and the two connection pipes 711 are respectively fixedly connected to the top and the bottom of the connection box 712. The first component 71 and the second component 72 and the second component 72 and the third component 73 are connected. An adjusting tube 75 is provided between the two connecting tubes 711 of the two adjacent components, and the adjusting tube 75 is respectively sleeved on the two connecting tubes 711. The inner wall of the adjusting tube 75 is provided with two sections of external threads with opposite spiral directions, and the two sections of external threads are respectively matched with the threads of the two connecting tubes 711; at least one positioning rod 76 is provided on the two connecting tubes 711 along the axial direction of the connecting tubes 711, and the positioning rod 76 extends into the side walls of the two connecting tubes 711. The positioning rod 76 is fixed to one of the connecting tubes 711, and the other connecting tube 711 can slide on the positioning rod 76 along the length direction of the positioning rod 76.

[0057] By rotating the adjusting tube 75 , the distance between the two connecting tubes 711 can be adjusted, thereby adjusting the distance between two adjacent components.

[0058] Specifically, a clearance hole 7121 penetrating the side wall of the connection box 712 is provided on one side of the connection box 712, and the clearance hole 7121 is set as a rectangular hole, and the length direction of the clearance hole 7121 is parallel to the length direction of the side of the connection box 712 where the rectangular hole is set; a disassembly plate 713 is provided in the connection box 712, one end of the disassembly plate 713 passes through the clearance hole 7121 and is inserted into the connection box 712, and the other end is exposed outside the connection box 712, and a matching plate 7131 matching with the clearance hole 7121 is fixedly connected to the disassembly plate 713; A positioning ring 714 is provided on the inner wall of the connection box 712 away from the clearance hole 7121. The end of the disassembly plate 713 inserted into the connection box 712 is inserted into the positioning ring 714 and matched with the positioning ring 714; two blocking components 715 are respectively provided at both ends of the clearance hole 7121. After the disassembly plate 713 is inserted into the connection box 712, the blocking component 715 blocks the matching plate 7131 from being separated from the clearance hole 7121; the blocking component 715 includes a fixing sleeve 7151, a blocking rod 7152, an elastic member 7153 and a pull rod 7154. The fixing sleeve 7151 is fixedly connected to the connection box 712, and the length direction of the fixing sleeve 7151 is parallel to the length direction of the side surface of the connection box 712 where the clearance hole 7121 is set; one end of the blocking rod 7152 is inserted into the fixing sleeve 7151 from the end of the fixing sleeve 7151 close to the clearance hole 7121 and can slide in the fixing sleeve 7151 along the length direction of the fixing sleeve 7151; the end of the blocking rod 7152 away from the fixing sleeve 7151 can slide to the side of the clearance hole 7121 away from the positioning ring 714 to block the limiting plate from moving from the clearance hole 71 21; the elastic member 7153 is arranged in the fixed sleeve 7151, and the elastic force of the elastic member 7153 is applied to the blocking rod 7152. When the elastic member 7153 is in a normal state, the blocking rod 7152 slides away from the end of the fixed sleeve 7151 to the side of the clearance hole 7121 away from the positioning ring 714; the pull rod 7154 is fixedly connected to the end of the fixed sleeve 7151 away from the clearance hole 7121 and the length direction is arranged along the length direction of the fixed sleeve 7151, and the pull rod 7154 passes through the fixed sleeve 7151 in the direction away from the clearance hole 7121.

[0059] The first collimator lens group 3 in the first component 71 is fixed on the disassembly plate 713 , the conic lens 4 in the second component 72 is fixed on the disassembly plate 713 , and the second collimator lens group 5 in the third component 73 is fixed on the disassembly plate 713 .

[0060] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A ring-shaped laser spot generator based on an aconic lens (4), characterized in that: It comprises a laser emitter (1), wherein the laser emitter (1) is used to emit laser light; A first collimating lens group (3), wherein the first collimating lens group (3) is used to collimate the laser beam; an aconic lens (4), wherein the conical tip end of the aconic lens (4) is arranged toward the first collimating lens group (3) and serves as the incident end of the light beam, and the flat end serves as the exit end of the light beam, and the aconic lens (4) is used to shape the collimated laser beam into an annular light spot; a second collimator lens group (5), the second collimator lens group (5) being arranged on a side of the aconic lens (4) away from the first collimator lens group (3), the second collimator lens group (5) being used to focus the annular light spot on an image plane at a specified distance; and a light shielding plate (6), wherein the light shielding plate (6) is arranged on a side of the second collimating lens group (5) away from the axle lens (4), and the light shielding plate (6) is used to shield stray light at the center of the shaped annular laser beam.

2. The annular laser spot generator based on an aconic lens (4) according to claim 1, characterized in that: It also comprises a light homogenizer (2), which is arranged between the laser emitter (1) and the first collimator lens group (3), and is used to homogenize the laser light emitted by the laser emitter (1).

3. The annular laser spot generator based on an aconic lens (4) according to claim 2, characterized in that: The focal length of the first collimating lens group (3) is set to f1, f1 = (r + 1) / tan (w), wherein the diameter of the light beam after being homogenized by the scattering plate is 2r, and the full angle of divergence of the light beam is 2w.

4. The annular laser spot generator based on an aconic lens (4) according to claim 3, characterized in that: The cone angle of the top angle of the axle lens (4) is in the range of 90-179°.

5. The annular laser spot generator based on an aconic lens (4) according to claim 4, characterized in that: The focal length of the second collimating lens group (5) is set to f2, f2 = (R + 1) × tan (Y), wherein the diameter of the light spot size at the output end face of the axle lens (4) is 2R, and the full angle of the annular light beam cone is 2Y.

6. The annular laser spot generator based on an aconic lens (4) according to claim 5, characterized in that: The radius of the annular spot is D, D≈tan((n-1)×m / 2)×f2, m is the vertex angle of the axle lens (4), and n is the refractive index of the material of the axle lens (4).

7. The annular laser spot generator based on an aconic lens (4) according to claim 6, characterized in that: At a specific distance L, the maximum outer radius of the annular light spot is set to P, P≈L×tan(U)+D, and the divergence angle of the light beam after shaping by the second collimator lens group (5) is U≈arcsin(0.22).

8. The annular laser spot generator based on an aconic lens (4) according to claim 7, characterized in that: It also comprises a housing (7), wherein the laser emitter (1), the first collimating lens group (3), the aconic lens (4), the second collimating lens group (5), the light homogenizing sheet (2) and the light shielding sheet (6) are all arranged in the housing (7); The housing (7) comprises a first component (71), and a laser emitter (1), a light homogenizer (2) and a first collimator lens group (3) are arranged on the first component (71); A second component (72), wherein the aconic lens (4) is arranged in the second component (72); A third component part (73), wherein the second collimating lens group (5) is arranged in the third component part (73); and a fourth component part (74), wherein the shading sheet (6) is arranged in the fourth component part (74), the third component part (73) and the fourth component part (74) are fixedly connected together, and the distance between the first component part (71) and the second component part (72), and between the second component part (72) and the third component part (73) are adjustable.

9. The annular laser spot generator based on an aconic lens (4) according to claim 8, characterized in that: The first component (71), the second component (72) and the third component (73) have the same structure; The first component (71) includes a connection box (712), wherein the cross section of the connection box (712) is arranged to be rectangular; and a connecting pipe (711), wherein two connecting pipes (711) are provided, the two connecting pipes (711) are coaxially arranged and the two connecting pipes (711) are respectively fixedly connected to the top and the bottom of the connecting box (712); An adjusting tube (75) is provided between the first component (71) and the second component (72) and between the second component (72) and the third component (73). The adjusting tube (75) is respectively sleeved on two connecting tubes (711) of two adjacent components. Two sections of external threads with opposite spiral directions are provided on the inner wall of the adjusting tube (75). The two sections of external threads are respectively matched with threads of the two connecting tubes (711). At least one positioning rod (76) is arranged on the two connecting tubes (711) along the axial direction of the connecting tubes (711). The positioning rod (76) extends into the side walls of the two connecting tubes (711). The positioning rod (76) is fixed to one of the connecting tubes (711), and the other connecting tube (711) can slide on the positioning rod (76) along the length direction of the positioning rod (76).

10. The annular laser spot generator based on an aconic lens (4) according to claim 9, characterized in that: A clearance hole (7121) penetrating the side wall of the connection box (712) is provided on one side of the connection box (712); the clearance hole (7121) is provided as a rectangular hole; and the length direction of the clearance hole (7121) is parallel to the length direction of the side surface of the connection box (712) on which the rectangular hole is provided; A disassembly plate (713) is provided in the connection box (712), one end of the disassembly plate (713) passes through the clearance hole (7121) and is inserted into the connection box (712), and the other end is exposed outside the connection box (712), and a matching plate (7131) matching with the clearance hole (7121) is fixedly connected to the disassembly plate (713); A positioning ring (714) is provided on the inner wall of the connection box (712) at a side away from the clearance hole (7121), and one end of the disassembly plate (713) inserted into the connection box (712) is inserted into the positioning ring (714) and matched with the positioning ring (714); Two blocking components (715) are respectively arranged at both ends of the clearance hole (7121), and the blocking components (715) block the matching plate (7131) from being separated from the clearance hole (7121) after the disassembly plate (713) is inserted into the connection box (712); The blocking component (715) comprises a fixing sleeve (7151), wherein the fixing sleeve (7151) is fixedly connected to the connection box (712), and the length direction of the fixing sleeve (7151) is parallel to the length direction of the side surface of the connection box (712) where the clearance hole (7121) is arranged; a blocking rod (7152), one end of which is inserted into the fixing sleeve (7151) from the end of the fixing sleeve (7151) close to the clearance hole (7121) and can slide in the fixing sleeve (7151) along the length direction of the fixing sleeve (7151), and the end of the blocking rod (7152) away from the fixing sleeve (7151) can slide to the side of the clearance hole (7121) away from the positioning ring (714) to prevent the limiting plate from being separated from the clearance hole (7121); An elastic member (7153), wherein the elastic member (7153) is disposed in the fixing sleeve (7151), and the elastic force of the elastic member (7153) is applied to the blocking rod (7152). When the elastic member (7153) is in a normal state, the blocking rod (7152) slides away from one end of the fixing sleeve (7151) to the side of the clearance hole (7121) away from the positioning ring (714); and a pull rod (7154), wherein the pull rod (7154) is fixedly connected to one end of the fixing sleeve (7151) away from the clearance hole (7121) and is arranged along the length direction of the fixing sleeve (7151), and the pull rod (7154) penetrates the fixing sleeve (7151) in a direction away from the clearance hole (7121).

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