CN107102429B - Industrial lens with optical compensation function - Google Patents
Industrial lens with optical compensation function Download PDFInfo
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- CN107102429B CN107102429B CN201710386986.4A CN201710386986A CN107102429B CN 107102429 B CN107102429 B CN 107102429B CN 201710386986 A CN201710386986 A CN 201710386986A CN 107102429 B CN107102429 B CN 107102429B
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- end surface
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- compensation function
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- 230000003287 optical effect Effects 0.000 title claims abstract description 34
- 230000014509 gene expression Effects 0.000 claims abstract description 5
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 102220012898 rs397516346 Human genes 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 6
- 230000004075 alteration Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004026 adhesive bonding Methods 0.000 abstract description 2
- 239000003292 glue Substances 0.000 description 4
- 239000006059 cover glass Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
The invention provides an industrial lens with an optical compensation function, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis; the focal powers of the first to seventh lenses are positive, negative, positive, and positive, respectively, in order; the fourth lens and the fifth lens respectively meet the following conditional expressions with the whole lens: 0.2 </4/f <0.3,0.25 </5/f <0.35, wherein f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the focal length of the whole lens. The second lens and the third lens are glued to form a first glued lens, and the fourth lens and the fifth lens are glued to form a second glued lens. The lens is characterized in that proper lenses are selected and the lenses are reasonably arranged, meanwhile, chromatic aberration is lower through the lenses of the gluing part, and imaging effect is better.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to an industrial lens with an optical compensation function.
Background
Industrial lenses are increasingly used in machine vision and industrial automation equipment, and unlike conventional lenses, they are required to be used under various working conditions, focusing distances from 0.15 mm to infinity require excellent imaging quality, and the image quality at all working distances is required to meet chip requirements.
The imaging quality of the prior art lens is lower, the chromatic aberration is larger, and the imaging quality from the micro distance to infinity can not be satisfied, and the chip requirements of 1/1.8 and 600W resolution can be satisfied.
Disclosure of Invention
The invention provides an industrial lens with an optical compensation function, which solves the technical problems of low imaging quality and larger chromatic aberration of the existing lens.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an industrial lens with an optical compensation function comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis; the focal powers of the first to seventh lenses are positive, negative, positive, and positive, respectively, in order; the fourth lens and the fifth lens respectively meet the following conditional expressions with the whole lens:
0.2 </4/f <0.3,0.25 </5/f <0.35, wherein f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the focal length of the whole lens.
Further, the second lens and the third lens are glued to form a first glued lens, and the fourth lens and the fifth lens are glued to form a second glued lens.
Further, the first to sixth lenses are combined to form a focusing group, the seventh lens is a fixed group, and optical compensation is performed by adjusting the interval distance between the focusing group and the fixed group.
Further, during focusing, the air space D67 between the sixth lens and the seventh lens on the optical axis satisfies the following conditions: 8< D67<11.
Further, the focal lengths, refractive indexes, and curved radii of the respective surfaces of the first to seventh lenses satisfy the following conditions:
wherein f1 to f7 are focal lengths of the first lens to the seventh lens respectively in sequence; n1 to n7 are refractive indexes of the first lens to the seventh lens in order, respectively; r1 and R2 are respectively a first object end surface and a first image end surface of the first lens, R3 and R4 are respectively a second object end surface and a second image end surface of the second lens, R5 and R6 are respectively a third object end surface and a third image end surface of the third lens, R7 and R8 are respectively a fourth object end surface and a fourth image end surface of the fourth lens, R9 and R10 are respectively a fifth object end surface and a fifth image end surface of the fifth lens, R11 and R12 are respectively a sixth object end surface and a sixth image end surface of the sixth lens, and R13 and R14 are respectively a seventh object end surface and a seventh image end surface of the seventh lens; "-" indicates that the direction is negative, and INF indicates infinity.
Preferably, the first lens and the second lens are closely connected through a spacer ring, and the fifth lens and the sixth lens are closely connected through the spacer ring.
Preferably, a diaphragm is arranged between the third lens and the fourth lens, and the sixth lens and the seventh lens are connected through multiple threads, so that the interval distance between the two lenses can be adjusted.
The invention provides an industrial lens with an optical compensation function, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis; the focal powers of the first to seventh lenses are positive, negative, positive, and positive, respectively, in order; the fourth lens and the fifth lens respectively meet the following conditional expressions with the whole lens: 0.2 </4/f <0.3,0.25 </5/f <0.35, wherein f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the focal length of the whole lens. The second lens and the third lens are glued to form a first glued lens, and the fourth lens and the fifth lens are glued to form a second glued lens. The lens is characterized in that proper lenses are selected and the lenses are reasonably arranged, meanwhile, chromatic aberration is lower through the lenses of the gluing part, and imaging effect is better.
Drawings
Fig. 1 is a schematic structural diagram of an industrial lens with optical compensation function according to the present invention.
Detailed Description
Embodiments of the present invention will now be described in detail with reference to the drawings, which are intended to be used as references and illustrations only, and are not intended to limit the scope of the invention.
As shown in fig. 1, an industrial lens with an optical compensation function, the entire lens having only 35mm, includes a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, a fifth lens G5, a sixth lens G6, and a seventh lens G7 arranged in this order from the object side to the image side along the optical axis; the focal powers of the first to seventh lenses are positive, negative, positive, and positive, respectively, in order; the fourth lens G4 and the fifth lens G5 respectively satisfy the following conditional expressions with the whole lens:
0.2 </4/f <0.3,0.25 </5/f <0.35, wherein f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the focal length of the whole lens.
The second lens G2 and the third lens G3 are cemented to form a first cemented lens, and the fourth lens G4 and the fifth lens G5 are cemented to form a second cemented lens.
The first to sixth lenses are combined to form a focusing group, the seventh lens G7 is a fixed group, and optical compensation is performed by adjusting the interval distance between the focusing group and the fixed group.
During focusing, the air space D67 between the sixth lens G6 and the seventh lens G7 on the optical axis satisfies the following conditions: 8< D67<11.
The focal length, refractive index and curved surface radius of each surface of the first to seventh lenses satisfy the following conditions:
| 31.2<f1<34.2 | 1.55<n1<1.75 | 12<R1<15 | 50.5<R2<53.5 |
| -34.2<f2<-31.2 | 1.60<n2<1.75 | 9.5<R3<11.5 | 6.5<R4<7.5 |
| 80.5<f3<84.5 | 1.40<n3<1.63 | 6.5<R5<7.5 | 6.5<R6<7.5 |
| -9.2<f4<-7.5 | 1.43<n4<1.65 | -8.9<R7<-7.2 | 10.3<R8<11.5 |
| 8.2<f5<10.5 | 1.55<n5<1.75 | -11.5<R9<-10.3 | -11.5<R10<-10.3 |
| 53.3<f6<59.1 | 1.65<n6<1.83 | 76<R11<84.5 | -84.5<R12<-76 |
| 127.3<f7<135.5 | 1.55<n7<1.75 | R13＝INF | -80<R14<-75 |
wherein f1 to f7 are focal lengths of the first lens G1 to the seventh lens G7, respectively, in order; n1 to n7 are refractive indexes of the first lens to the seventh lens in order, respectively; r1 and R2 are the first object end surface 1 and the first image end surface 2 of the first lens G1, R3 and R4 are the second object end surface 3 and the second image end surface of the second lens G2, R5 and R6 are the third object end surface and the third image end surface 5 of the third lens G3, R7 and R8 are the fourth object end surface 7 and the fourth image end surface of the fourth lens G4, R9 and R10 are the fifth object end surface and the fifth image end surface 9 of the fifth lens G5, R11 and R12 are the sixth object end surface 10 and the sixth image end surface 11 of the sixth lens G6, R13 and R14 are the seventh object end surface 12 and the seventh image end surface 13 of the seventh lens G7, respectively; "-" indicates that the direction is negative, and INF indicates infinity.
The second image end surface and the third object end surface coincide as a first glue surface 4 of the first glue lens, and the fourth image end surface and the fifth object end surface coincide as a second glue surface 8 of the second glue lens.
In this embodiment, the physical parameters of the lens are as follows:
| face number | Surface type | R(mm) | D(mm) | |
| 1 | Spherical surface | 14.536 | 2.3 | 1.6 |
| 2 | Spherical surface | 52.132 | 0.36 | |
| 3 | Spherical surface | 11.235 | 1.25 | 1.62 |
| 4 | Spherical surface | 7.32 | 6.12 | 1.47 |
| 5 | Spherical surface | 6.332 | 3.55 | |
| 6 | Plane surface | PL | 3.02 | |
| 7 | Spherical surface | -8.032 | 0.78 | 1.47 |
| 8 | Spherical surface | 11.05 | 5.23 | 1.7 |
| 9 | Spherical surface | -11.05 | 0.15 | |
| 10 | Spherical surface | 80.25 | 1.6 | 1.68 |
| 11 | Spherical surface | -80.25 | Movable (1.1-11) | |
| 12 | Spherical surface | INF | 3.15 | 1.75 |
| 13 | Spherical surface | -76 | 14.7 |
Wherein R is the surface radius, D is the distance between the corresponding optical surface and the next optical surface on the optical axis; nd corresponds to the refractive index of d light (wavelength 587 nm), and PL represents the plane.
The first lens G1 and the second lens G2 are closely connected through a spacing ring, and the fifth lens G5 and the sixth lens G6 are closely connected through a spacing ring.
A diaphragm 6 is arranged between the third lens G3 and the fourth lens G4, and the sixth lens G6 and the seventh lens G7 are connected through multiple threads, so that the interval distance between the two lenses can be adjusted; during optical compensation, the first lens element and the sixth lens element move integrally and back and forth relative to the seventh lens element, and the air gap between the sixth lens element and the seventh lens element on the optical axis can be varied between 1.1 mm and 11mm, especially between 8 mm and 11mm, with the best effect.
A cover glass is disposed on the image side of the seventh lens G7, and the air space between the seventh lens G7 and the cover glass on the optical axis is 14.7mm.
The above disclosure is illustrative of the preferred embodiments of the present invention and should not be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (7)
1. An industrial lens with an optical compensation function is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis; the focal powers of the first to seventh lenses are positive, negative, positive, and positive, respectively, in order; the fourth lens and the fifth lens respectively meet the following conditional expressions with the whole lens:
0.2 </4/f <0.3,0.25 </5/f <0.35, wherein f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the focal length of the whole lens.
2. An industrial lens with optical compensation function according to claim 1, wherein: the second lens and the third lens are glued to form a first glued lens, and the fourth lens and the fifth lens are glued to form a second glued lens.
3. An industrial lens with optical compensation function according to claim 2, wherein: the first lens to the sixth lens are combined to form a focusing group, the seventh lens is a fixed group, and optical compensation is performed by adjusting the interval distance between the focusing group and the fixed group.
4. An industrial lens with optical compensation function according to claim 3, wherein: during focusing, the air interval D67 between the sixth lens and the seventh lens on the optical axis satisfies the following conditions: 8< D67<11.
5. The industrial lens with optical compensation function according to claim 4, wherein the focal length, refractive index and curved radius of each surface of the first to seventh lenses satisfy the following conditions:
wherein f1 to f7 are focal lengths of the first lens to the seventh lens respectively in sequence; n1 to n7 are refractive indexes of the first lens to the seventh lens in order, respectively; r1 and R2 are respectively a first object end surface and a first image end surface of the first lens, R3 and R4 are respectively a second object end surface and a second image end surface of the second lens, R5 and R6 are respectively a third object end surface and a third image end surface of the third lens, R7 and R8 are respectively a fourth object end surface and a fourth image end surface of the fourth lens, R9 and R10 are respectively a fifth object end surface and a fifth image end surface of the fifth lens, R11 and R12 are respectively a sixth object end surface and a sixth image end surface of the sixth lens, and R13 and R14 are respectively a seventh object end surface and a seventh image end surface of the seventh lens; "-" indicates that the direction is negative, and INF indicates infinity.
6. The industrial lens with optical compensation function according to claim 5, wherein: the first lens and the second lens are closely connected through the spacer ring, and the fifth lens and the sixth lens are closely connected through the spacer ring.
7. An industrial lens with optical compensation function according to claim 1 or 5, wherein: a diaphragm is arranged between the third lens and the fourth lens; the sixth lens and the seventh lens are connected through multiple threads, so that the interval distance between the two lenses can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710386986.4A CN107102429B (en) | 2017-05-26 | 2017-05-26 | Industrial lens with optical compensation function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710386986.4A CN107102429B (en) | 2017-05-26 | 2017-05-26 | Industrial lens with optical compensation function |
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| CN107102429A CN107102429A (en) | 2017-08-29 |
| CN107102429B true CN107102429B (en) | 2023-05-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112269246B (en) * | 2020-12-14 | 2021-04-16 | 宁波永新光学股份有限公司 | Ultra-high-definition imaging optical system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336353A (en) * | 2013-06-26 | 2013-10-02 | 东莞市宇瞳光学科技有限公司 | Two-component optical compensation monitoring lens |
| CN105467566A (en) * | 2016-01-07 | 2016-04-06 | 东莞市宇瞳光学科技股份有限公司 | Large-aperture wide-angle zoom lens |
| WO2016176911A1 (en) * | 2015-05-04 | 2016-11-10 | 嘉兴中润光学科技有限公司 | Small-size wide-angle camera lens |
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- 2017-05-26 CN CN201710386986.4A patent/CN107102429B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336353A (en) * | 2013-06-26 | 2013-10-02 | 东莞市宇瞳光学科技有限公司 | Two-component optical compensation monitoring lens |
| WO2016176911A1 (en) * | 2015-05-04 | 2016-11-10 | 嘉兴中润光学科技有限公司 | Small-size wide-angle camera lens |
| CN105467566A (en) * | 2016-01-07 | 2016-04-06 | 东莞市宇瞳光学科技股份有限公司 | Large-aperture wide-angle zoom lens |
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Inventor after: Zhang Pinguang Inventor after: Li Zemin Inventor after: Liu Guanlu Inventor after: He Jianwei Inventor after: Mao Caiying Inventor before: Li Zemin |
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