CN212330053U - Focusing lens for laser cutting glass - Google Patents
Focusing lens for laser cutting glass Download PDFInfo
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- CN212330053U CN212330053U CN202021717374.2U CN202021717374U CN212330053U CN 212330053 U CN212330053 U CN 212330053U CN 202021717374 U CN202021717374 U CN 202021717374U CN 212330053 U CN212330053 U CN 212330053U
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- 239000011521 glass Substances 0.000 title claims abstract description 20
- 238000003698 laser cutting Methods 0.000 title claims abstract description 15
- 230000005499 meniscus Effects 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 9
- 238000002834 transmittance Methods 0.000 claims description 6
- 210000001747 pupil Anatomy 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses a focusing lens for laser cutting glass, which comprises a first double concave lens, a second meniscus lens, a third flat convex lens and a fourth double convex lens which are arranged along an optical axis from an object plane to an image plane at intervals in sequence, wherein the first double concave lens has negative focal power, and the second meniscus lens, the third flat convex lens and the fourth double convex lens all have positive focal power; the first biconcave lens focal length f1 and the total focal length f of the focusing lens satisfy the relation: -1.5< f1/f < -0.5, and the second meniscus lens focal length f2 and f satisfy the relation: 3.0< f2/f <4.0, and the third plano-convex lens focal length f3 and f satisfy the following relation: 1.0< f3/f <2.0, the fourth lenticular lens focal length f4 and f satisfy the relationship: 1.0< f4/f < 2.0. A plurality of lenses are coaxially and separately arranged from an object plane to an image plane, a positive and negative focal power combination mode is adopted, a negative focal power lens is placed at the position closest to the object plane, infinite conjugate between the image focal plane and the object space of the focusing lens can be realized, and the maximum working distance is realized on the premise of meeting the size of a focusing light spot.
Description
Technical Field
The utility model belongs to the technical field of laser cutting, concretely relates to a focusing lens structure for laser cutting glass.
Background
Different from the traditional mechanical cutting mode, the laser cutting of glass can cause a vertical stress zone in the glass by optimizing a cutting process, avoids the occurrence of chips and microcracks, and is more and more widely applied to glass cutting occasions due to the non-contact property, high efficiency and high precision.
The optical schemes for cutting glass by laser are many, but the most important optical module is a focusing lens. In order to realize the micron-level cutting precision, the diameter of the final focusing spot of the light beam by the focusing lens is required to be better than the micron level, and the imaging quality after the final adjustment of the focusing lens must reach the diffraction limit.
At present, large-NA and short-focus object-side telecentric objectives are generally designed by various laser application lens companies to meet the requirements; however, when the NA is increased and the focal length is reduced, the corresponding working distance is reduced, and the method cannot be applied to special occasions with limited space. Even if applicable to a particular space, these focus lenses suffer from the disadvantages of being complex in structure, difficult to assemble, or even impossible to assemble.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a focusing lens for laser cutting glass when satisfying focus facula diameter and being superior to micron level, can effectively solve the working distance and shorten partially, the structure is complicated, the problem of difficult assembly.
Therefore, the utility model discloses the technical scheme who adopts does: a focusing lens for cutting glass by laser comprises a first double-concave lens, a second meniscus lens, a third plano-convex lens and a fourth double-convex lens which are sequentially arranged from an object plane to an image plane at intervals along an optical axis, wherein the first double-concave lens has negative focal power, and the second meniscus lens, the third plano-convex lens and the fourth double-convex lens all have positive focal power; the first biconcave lens focal length f1 and the total focal length f of the focusing lens satisfy the relation: 1.5< f1/f < -0.5, and the second meniscus lens focal length f2 and the total focal length f of the focusing lens satisfy the following relation: 3.0< f2/f <4.0, and the third focal length f3 of the plano-convex lens and the total focal length f of the focusing lens satisfy the following relation: 1.0< f3/f <2.0, and the focal length f4 of the fourth biconvex lens and the total focal length f of the focusing lens satisfy the following relation: 1.0< f4/f < 2.0.
Preferably, the distance d1 between the entrance pupil EP and the first biconcave lens is 10mm, the distance d3 between the first biconcave lens and the second meniscus lens is 4.5mm, the distance d5 between the second meniscus lens and the third planoconvex lens is 1mm, the distance d7 between the third planoconvex lens and the fourth biconvex lens is 1mm, and the distance d9 between the fourth biconvex lens and the image plane IP is 59 mm.
More preferably, the center thickness d2 of the first double concave lens is 4mm, the center thickness d4 of the second meniscus lens is 10mm, the center thickness d6 of the third plano-convex lens is 5mm, and the center thickness d8 of the fourth double convex lens is 4 mm.
More preferably, the first biconcave lens has a curvature radius r11 close to the object plane of-17.318 mm and a curvature radius r12 close to the image plane of 45.36 mm; the curvature radius r21 of the second meniscus lens close to the object plane is-63.7 mm, and the curvature radius r22 of the second meniscus lens close to the image plane is-27.457 mm; the curvature radius r31 of the third planoconvex lens, which is close to the object plane, is infinite, and the curvature radius r32 of the third planoconvex lens, which is close to the image plane, is-36.677 mm; and the curvature radius r41 of the fourth biconvex lens close to the object plane is 43.653mm, and the curvature radius r42 of the fourth biconvex lens close to the image plane is-71.371 mm.
Preferably, the first biconcave lens, the second meniscus lens, the third biconvex lens and the fourth biconvex lens are made of the same optical material, the refractive index Nd of the optical material is 1.4-1.8, and each mirror surface is plated with an antireflection film with a corresponding wavelength, so that the transmittance of a single mirror surface can be ensured to be higher than 99.9%, and the transmittance of the whole focusing lens is higher than 99.2%.
More preferably, the first biconcave lens, the second meniscus lens, the third plano-convex lens and the fourth biconvex lens are made of the same optical material, and the refractive index Nd of the optical material is 1.46.
Further preferably, the root-mean-square radius of a focusing spot formed by the focusing lens is 0.378um, which is far smaller than the system Airy spot radius of 6 um.
The utility model has the advantages that: the design of the shape and the relative position of the lens effectively corrects aberration, increases the clear aperture, enables the focused light spot to reach the micron size and meets the requirement of glass cutting precision; 4-piece lens structure is adopted, so that the assembly cost and difficulty are reduced; the lens is arranged separately, so that the laser damage threshold of the lens is improved; by adopting a negative-positive focal power combination sequence, the position closest to the object plane is a negative focal power lens, and the three lenses on the back are positive focal power lenses, the maximum working distance (up to 59mm) is increased, and the practical glass cutting application is effectively met.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of a focusing lens forming a focusing spot at an image plane position.
Fig. 3 is a diagram of an optical modulation transfer function of a focusing lens.
Fig. 4 is a relative illumination diagram of the focusing lens.
Detailed Description
The invention will be further described by way of examples with reference to the accompanying drawings:
as shown in fig. 1, a focusing lens for laser cutting glass includes a first biconcave lens 1, a second meniscus lens 2, a third plano-convex lens 3, and a fourth biconvex lens 4, which are sequentially disposed at intervals along an optical axis from an object plane to an image plane. The object plane side and the image plane side of the first biconcave lens 1 are both concave, the object plane side of the second meniscus lens 2 is concave and the image plane side is convex, the object plane side of the third planoconvex lens 3 is flat and the image plane side is convex, and the object plane side and the image plane side of the fourth biconvex lens 4 are both convex.
The first double concave lens 1 has a negative power, and the second meniscus lens 2, the third plano-convex lens 3, and the fourth double convex lens 4 each have a positive power. The positive and negative focal power lenses are matched to balance the integral aberration of the system and realize long working distance. The focal length f1 of the first biconcave lens 1 and the total focal length f of the focusing lens satisfy the relation: 1.5< f1/f < -0.5, and the focal length f2 of the second meniscus lens 2 and the total focal length f of the focusing lens satisfy the relation: 3.0< f2/f <4.0, and the third plano-convex lens 3 focal length f3 and the total focal length f of the focusing lens satisfy the following relation: 1.0< f3/f <2.0, and the fourth biconvex lens 4 has a focal length f4 and the total focal length f of the focusing lens satisfy the following relation: 1.0< f4/f < 2.0.
The distance d1 between the entrance pupil EP and the first double-concave lens 1 is 10mm, the distance d3 between the first double-concave lens 1 and the second meniscus lens 2 is 4.5mm, the distance d5 between the second meniscus lens 2 and the third plano-convex lens 3 is 1mm, the distance d7 between the third plano-convex lens 3 and the fourth double-convex lens 4 is 1mm, and the distance d9 (i.e., the working distance) between the fourth double-convex lens 4 and the image plane IP is 59 mm.
The center thickness d2 of the first double concave lens 1 is 4mm, the center thickness d4 of the second meniscus lens 2 is 10mm, the center thickness d6 of the third planoconvex lens 3 is 5mm, and the center thickness d8 of the fourth double convex lens 4 is 4 mm.
The first biconcave lens 1 has a curvature radius r11 close to an object plane of-17.318 mm and a curvature radius r12 close to an image plane of 45.36 mm; the radius of curvature r21 of the second meniscus lens 2 close to the object plane is-63.7 mm, and the radius of curvature r22 of the second meniscus lens close to the image plane is-27.457 mm; a third planoconvex lens 3, the radius of curvature r31 of which close to the object plane is infinite, and the radius of curvature r32 of which close to the image plane is-36.677 mm; the fourth lenticular lens 4 has a radius of curvature r41 near the object plane of 43.653mm and a radius of curvature r42 near the image plane of-71.371 mm.
The first biconcave lens 1, the second meniscus lens 2, the third planoconvex lens 3 and the fourth biconvex lens 4 are made of the same optical material, and the refractive index Nd of the optical material is 1.4-1.8, for example, Nd is 1.46. Each mirror surface is plated with an antireflection film with corresponding wavelength, so that the transmittance of a single mirror surface can be ensured to be higher than 99.9%, and the transmittance of the whole focusing lens is higher than 99.2%.
The following table shows the radius of curvature of the lens, the center thickness of the lens, and the distance between the lenses from the object plane to the image plane along the optical axis.
| d1＝10 | Entrance pupil EP | |
| r11＝-17.318 | d2＝4 | n＝1.46，L1 |
| r12＝45.36 | d3＝4.5 | |
| r21＝-63.7 | d4＝10 | n＝1.46，L2 |
| r22＝-27.457 | d5＝1 | |
| r 31-infinity | d6＝5 | n＝1.46，L3 |
| r32＝-36.677 | d7＝1 | |
| r41＝43.653 | d8＝4 | n＝1.46，L4 |
| r42＝-71.371 | d9＝59 | Image plane IP |
As shown in fig. 2, the root-mean-square radius of the focusing spot formed by the focusing lens is 0.378um, which is much smaller than the radius of the system airy spot of 6um, so that sufficient tolerance adjustment allowance is left for the curvature radius and the distance between the lenses, and the processing and assembling difficulty is reduced.
As shown in fig. 3, the transfer function fitting curve of the focusing lens is highly overlapped with the diffraction limit curve, which indicates that the imaging quality of the focusing lens design has reached the theoretical design limit, and has excellent imaging quality.
As shown in fig. 4, the laser beam has uniform irradiance distribution and concentrated energy on the working surface, and meets the use requirements.
Claims (7)
1. The utility model provides a focusing lens for laser cutting glass which characterized in that: the optical lens comprises a first double-concave lens (1), a second meniscus lens (2), a third plano-convex lens (3) and a fourth double-convex lens (4) which are sequentially arranged from an object plane to an image plane at intervals along an optical axis, wherein the first double-concave lens (1) has negative focal power, and the second meniscus lens (2), the third plano-convex lens (3) and the fourth double-convex lens (4) all have positive focal power; the focal length f1 of the first biconcave lens (1) and the total focal length f of the focusing lens satisfy the relation: -1.5< f1/f < -0.5, and the focal length f2 of the second meniscus lens (2) and the total focal length f of the focusing lens satisfy the relation: 3.0< f2/f <4.0, and the focal length f3 of the third planoconvex lens (3) and the total focal length f of the focusing lens satisfy the relation: 1.0< f3/f <2.0, and the focal length f4 of the fourth biconvex lens (4) and the total focal length f of the focusing lens satisfy the following relation: 1.0< f4/f < 2.0.
2. The focusing lens for laser cutting glass according to claim 1, characterized in that: the distance d1 between the entrance pupil EP and the first biconcave lens (1) is 10mm, the distance d3 between the first biconcave lens (1) and the second meniscus lens (2) is 4.5mm, the distance d5 between the second meniscus lens (2) and the third biconvex lens (3) is 1mm, the distance d7 between the third biconvex lens (3) and the fourth biconvex lens (4) is 1mm, and the distance d9 between the fourth biconvex lens (4) and the image plane IP is 59 mm.
3. The focusing lens for laser cutting glass according to claim 2, characterized in that: the center thickness d2 of the first double concave lens (1) is 4mm, the center thickness d4 of the second meniscus lens (2) is 10mm, the center thickness d6 of the third plano-convex lens (3) is 5mm, and the center thickness d8 of the fourth double convex lens (4) is 4 mm.
4. The focusing lens for laser cutting glass according to claim 3, characterized in that: the curvature radius r11 of the first biconcave lens (1) close to the object plane is-17.318 mm, and the curvature radius r12 of the first biconcave lens close to the image plane is 45.36 mm; the curvature radius r21 of the second meniscus lens (2) close to the object plane is-63.7 mm, and the curvature radius r22 of the second meniscus lens close to the image plane is-27.457 mm; the curvature radius r31 of the third planoconvex lens (3) close to the object plane is infinite, and the curvature radius r32 of the third planoconvex lens close to the image plane is-36.677 mm; and the curvature radius r41 of the fourth biconvex lens (4) close to the object plane is 43.653mm, and the curvature radius r42 of the fourth biconvex lens close to the image plane is-71.371 mm.
5. The focusing lens for laser cutting glass according to claim 1, characterized in that: the first biconcave lens (1), the second meniscus lens (2), the third planoconvex lens (3) and the fourth biconvex lens (4) are made of the same optical material, the refractive index Nd of the optical material is 1.4-1.8, and each mirror surface is plated with an antireflection film with a corresponding wavelength, so that the transmittance of a single mirror surface can be ensured to be higher than 99.9%, and the transmittance of the whole focusing lens is higher than 99.2%.
6. The focusing lens for laser cutting glass according to claim 5, characterized in that: the refractive index Nd of the optical material used by the first biconcave lens (1), the second meniscus lens (2), the third plano-convex lens (3) and the fourth biconvex lens (4) is 1.46.
7. The focusing lens for laser cutting glass according to any one of claims 1 to 6, characterized in that: the root mean square radius of a focusing spot formed by the focusing lens is 0.378um, which is far smaller than the system Airy spot radius of 6 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021717374.2U CN212330053U (en) | 2020-08-18 | 2020-08-18 | Focusing lens for laser cutting glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021717374.2U CN212330053U (en) | 2020-08-18 | 2020-08-18 | Focusing lens for laser cutting glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212330053U true CN212330053U (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021717374.2U Active CN212330053U (en) | 2020-08-18 | 2020-08-18 | Focusing lens for laser cutting glass |
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| Country | Link |
|---|---|
| CN (1) | CN212330053U (en) |
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- 2020-08-18 CN CN202021717374.2U patent/CN212330053U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240202 Address after: 215000 Suzhou, Jiangsu Province, China (Jiangsu) Pilot Free Trade Zone Suzhou Area, Suzhou Industrial Park, No. 155 Suhong West Road Patentee after: Suzhou Carmen Hass Laser Technology Co.,Ltd. Country or region after: China Address before: 215201 155 Suhong West Road, Suzhou Industrial Park, Jiangsu Province Patentee before: CARMANHAAS LASER TECHNOLOGY (SUZHOU) CO.,LTD. Country or region before: China |
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| TR01 | Transfer of patent right |