CN111142242B - A low distortion industrial lens with high resolution and wide working distance - Google Patents
A low distortion industrial lens with high resolution and wide working distance Download PDFInfo
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- CN111142242B CN111142242B CN202010151586.7A CN202010151586A CN111142242B CN 111142242 B CN111142242 B CN 111142242B CN 202010151586 A CN202010151586 A CN 202010151586A CN 111142242 B CN111142242 B CN 111142242B
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- 230000005499 meniscus Effects 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 abstract description 6
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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Abstract
本发明属于镜头技术领域，具体涉及一种高分辨率宽工作距离的低畸变工业镜头，包括机械装置及安装于机械装置内部的光学模组，光学模组由物方到像方依次设置调焦组和固定组，调焦组包括第一透镜组、光阑和第二透镜组；光学模组的焦距f，第一透镜组的焦距为f1，第二透镜组的焦距为f2，固定组的焦距为f3，2.5＜|f1/f|＜5.0；1.0＜|f2/f|＜2.0；2.0＜|f3/f|＜3.0。本发明镜头光学模组焦距为25mm，最大成像面为φ17.6mm，分辨率可达200lp/mm，全视场光学畸变低于0.5％；工作距离宽，采用浮动对焦方式，从250mm～∞均可达到成像要求。
The invention belongs to the technical field of lenses, and specifically relates to a low-distortion industrial lens with high resolution and wide working distance, comprising a mechanical device and an optical module installed inside the mechanical device, wherein the optical module is provided with a focus group and a fixed group in sequence from the object side to the image side, wherein the focus group comprises a first lens group, an aperture and a second lens group; the focal length f of the optical module, the focal length of the first lens group is f 1 , the focal length of the second lens group is f 2 , the focal length of the fixed group is f 3 , 2.5＜|f 1 /f|＜5.0; 1.0 ＜|f 2 /f|＜2.0; 2.0＜| f 3 /f|＜3.0. The focal length of the optical module of the lens of the invention is 25mm, the maximum imaging surface is φ17.6mm, the resolution can reach 200lp/mm, and the full-field optical distortion is less than 0.5%; the working distance is wide, and a floating focus method is adopted, and imaging requirements can be met from 250mm to ∞.
Description
Technical Field
The invention belongs to the technical field of industrial lenses, and particularly relates to a low-distortion industrial lens with high resolution and wide working distance.
Background
Industrial lenses are continuously developed under the promotion of industrial automation. As application requirements continue to increase, the requirements for industrial lenses are also increasing. In particular, in some applications such as defect detection, positioning monitoring and color selection, the requirements on optical distortion, applicable working distance range, resolution and the like of the industrial lens are high, but the defects of different types or different degrees such as small supporting target surface, low pixels, narrow working distance, large distortion and the like of the existing industrial lens generally exist in China, so that the research and development of the industrial lens with high pixels, low distortion and wide working distance are urgent.
At present, the diameter of the round target surface of the machine vision lens on the market is only 43mm, the optical distortion is 2%, the resolution is only 600 ten thousand, the working distance of the lens is clearly imaged at 300mm, the distortion rate is less than 0.5%, and the optical distortion is less than 0.1%, but the pixels are only 500 ten thousand, as in the patent with the patent number of 201710504554.9.
Disclosure of Invention
Aiming at the defects of the prior art, the invention develops the low-distortion industrial lens with high resolution and wide working distance, and meets the industrial development requirement.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The low-distortion industrial lens with high resolution and wide working distance comprises a mechanical device and an optical module arranged in the mechanical device, wherein a focusing group and a fixed group S3 are sequentially arranged from an object side to an image side of the optical module, and when the working distance is changed, the air interval between the focusing group and the fixed group S3 is changed to focus;
the focusing group comprises a first lens group S1, a diaphragm and a second lens group S2;
the first lens group S1 includes a first lens G1 having negative power and a meniscus structure, a second lens G2 having positive power and a biconvex structure, a third lens G3 having positive power and a biconvex structure, and a fourth lens G4 having negative power and a biconcave structure;
the second lens group S2 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, and a seventh lens G7 having positive power and a biconvex structure;
the fixed group S3 comprises an eighth lens G8 with negative focal power and a meniscus structure, and a ninth lens G9 with positive focal power and a biconvex structure;
The focal length f of the optical module, the focal length of the first lens group S1 is f 1, the focal length of the second lens group S2 is f 2, the ratio of the focal length of the fixed group S3 to f 3,f1 and f satisfies the relation, the ratio of 2.5< |f 1/f|＜5.0;f2 and f satisfies the relation, and the ratio of 1.0< |f 2/f|＜2.0;f3 and f satisfies the relation, 2.0< |f 3/f| <3.0.
As an improvement of the high-resolution wide-working-distance low-distortion industrial lens, the distance from the ninth lens G9 of the optical module to the image plane, namely the optical back intercept BFL, and the focal length f of the optical module, satisfy the relation of I BFL/f <1.0.
As an improvement of the high-resolution wide-working-distance low-distortion industrial lens, the half image height y' of the optical module and the focal length f of the optical module meet the relation of y/f <0.4.
As an improvement of the high resolution wide working distance low distortion industrial lens of the present invention, the refractive index of the first lens G1 is n1,1.45< n1<1.55.
As an improvement of the high resolution wide working distance low distortion industrial lens of the present invention, the refractive index of the second lens G2 is n2,1.75< n2<1.90.
As an improvement of the high-resolution wide-working-distance low-distortion industrial lens, the third lens G3 and the fourth lens G4 are glued to form a first glued lens group U1, and the ratio of the focal length f u1,fu1 to the focal length f 1 of the first glued lens group U1 meets the relation of 0.5< |f u1/f1 | <1.0.
As an improvement of the high-resolution wide-working-distance low-distortion industrial lens, the fifth lens G5 and the sixth lens G6 are glued to form a second glued lens group U2, and the ratio of the focal length f u2,fu2 to the focal length f 2 of the second glued lens group U2 meets the relation of 1.0< |f u2/f2 | <1.5.
As an improvement of the high resolution wide working distance low distortion industrial lens of the present invention, the refractive index of the seventh lens G7 is n7,1.85< n7<1.95.
As an improvement of the high-resolution wide-working-distance low-distortion industrial lens, the eighth lens G8 and the ninth lens G9 are cemented to form a third cemented lens group U3, the focal length of the eighth lens G8 is f G8, the ratio of the focal lengths f G9,fG8 and f 3 of the ninth lens G9 satisfies the relation of 0.3< |f G8/f3|＜0.45,fG9 and f 3 satisfies the relation of 0.3< |f G9/f3 | <0.45.
As an improvement of the high-resolution wide-working-distance low-distortion industrial lens, each lens is a spherical lens.
The invention has the beneficial effects that the optical module of the low-distortion industrial lens with the focal length of 25mm and the high resolution and wide working distance is realized through the structure, the maximum imaging surface is phi 17.6mm, the resolution can reach 200lp/mm, the highest pixel can reach 2300 ten thousand pixels, the full-view optical distortion is lower than 0.5%, the working distance is wide, the corresponding imaging requirements can be met from 250mm to infinity by adopting a floating focusing mode, the different application requirements can be met, and the clear aperture can be flexibly adjusted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a diagram of a lens optical module according to an embodiment;
FIG. 2 is a schematic diagram of a lens module according to an embodiment;
FIG. 3 is a graph showing optical distortion of a lens optical module according to an embodiment;
In the figure, the lens is composed of a 1-diaphragm, a 2-image surface, a G1-first lens, a G2-second lens, a G3-third lens, a G4-fourth lens, a G5-fifth lens, a G6-sixth lens, a G7-seventh lens, a G8-eighth lens, a G9-ninth lens, a U1-first cemented lens group, a U2-second cemented lens group, a U3-third cemented lens group, a S1-first lens group, a S2-second lens group and a S3-fixed group.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention will be described in further detail below with reference to the drawings, but is not limited thereto.
Examples
As shown in fig. 1, the present embodiment provides a low distortion industrial lens with high resolution and wide working distance, which includes a mechanical device and an optical module installed inside the mechanical device, wherein the optical module sequentially sets a focusing group and a fixed group S3 from an object side to an image side, and when the working distance is changed, an air interval between the focusing group and the fixed group S3 is changed to focus;
The focusing group comprises a first lens group S1, a diaphragm 1 and a second lens group S2;
The first lens group S1 includes a first lens G1 having negative power and a meniscus structure, a second lens G2 having positive power and a biconvex structure, a third lens G3 having positive power and a biconvex structure, and a fourth lens G4 having negative power and a biconcave structure;
The second lens group S2 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, and a seventh lens G7 having positive power and a biconvex structure;
The fixed group S3 includes an eighth lens G8 having negative power and a meniscus structure, a ninth lens G9 having positive power and a biconvex structure;
The focal length f of the optical module, the focal length of the first lens group S1 is f 1, the focal length of the second lens group S2 is f 2, the ratio of the focal lengths of the fixed group S3 to f 3,f1 and f satisfies the relation, the ratio of 2.5< |f 1/f|＜5.0;f2 and f satisfies the relation, and the ratio of 1.0< |f 2/f|＜2.0;f3 and f satisfies the relation, 2.0< |f 3/f| <3.0.
Further, the distance between the ninth lens G9 of the optical module and the image plane 2, namely the optical back intercept BFL and the focal length f of the optical module, satisfies the relation of I BFL/f <1.0.
Further, the half image height y' of the optical module and the focal length f of the optical module satisfy the relation of y/f <0.4.
Further, the refractive index of the first lens G1 is n1,1.45< n1<1.55.
Further, the refractive index of the second lens G2 is n2,1.75< n2<1.90.
Further, the third lens G3 and the fourth lens G4 are glued to form a first glued lens group U1, and the ratio of the focal lengths f u1,fu1 and f 1 of the first glued lens group U1 satisfies the relation 0.5< |f u1/f1 | <1.0.
Further, the fifth lens G5 and the sixth lens G6 are glued to form a second glued lens group U2, and the ratio of the focal lengths f u2,fu2 and f 2 of the second glued lens group U2 satisfies the relation of 1.0< |f u2/f2 | <1.5.
Further, the refractive index of the seventh lens G7 is n7,1.85< n7<1.95.
Further, the eighth lens G8 and the ninth lens G9 are glued to form a third glued lens group U3, the focal length of the eighth lens G8 is f G8, the ratio of the focal lengths f G9,fG8 and f 3 of the ninth lens G9 satisfies the relation that the ratio of 0.3< |f G8/f3|＜0.45,fG9 to f 3 satisfies the relation that 0.3< |f G9/f3 | <0.45.
Further, each lens is a spherical mirror.
The specific optical module data are as follows:
In the present embodiment, the focal length F of the optical module is 25mm, the maximum aperture is f# =2.8, the focal length F 1 of the first lens group S1=86.4 mm, the focal length F 2 of the second lens group S2=36.1 mm, the focal length F 3 of the fixed group S3=58.6 mm, the focal length F U1 =83.9 mm of the first cemented lens group U1, the focal length F U2 = -44.7mm of the second cemented lens group U2, the focal length F G8 = -25.7mm of the eighth lens G8, the focal length F G9 =17.9 mm of the ninth lens group G9, the optical back focal length bfl=13.6 mm, and the half image height y' =8.8 mm.
Each relation type ：|f1/f|＝3.45;|f2/f|＝1.44;|f3/f|＝2.34;|BFL/f|＝0.54;|y'/f|＝0.35;|fU1/f1|＝0.97;|fU2/f2|＝1.23;|fG8/f3|＝0.43;|fG9/f3|＝0.1.
Satisfy the relation ：2.5<|f1/f|<5.0;1.0<|f2/f|<2.0;2.0<|f3/f|<3.0;|BFL/f|＜1.0;|y'/f|＜0.4;0.5＜|fU1/f1|＜1.0;1.0＜|fU2/f2|＜1.5;0.3＜|fG8/f3|、|fG9/f3|＜0.45.
Fig. 3 shows the optical distortion graph of the present embodiment, wherein the maximum optical distortion is less than 0.5% in the full field of view.
The optical module of the low-distortion industrial lens with the focal length of 25mm and the high resolution and the wide working distance is realized through the structure, the maximum imaging surface is phi 17.6mm, the resolution of the optical module can reach 200lp/mm, the highest pixel can reach 2300 ten thousand pixels, the optical distortion of the whole field of view is lower than 0.5%, the working distance is wide, the corresponding imaging requirements can be met from 250mm to infinity by adopting a floating focusing mode, different application requirements can be met, and meanwhile, the clear aperture of the optical module can be flexibly adjusted.
While the foregoing description illustrates and describes several preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (5)
1. The low-distortion industrial lens with high resolution and wide working distance is characterized by comprising a mechanical device and an optical module arranged in the mechanical device, wherein a focusing group and a fixed group S3 are sequentially arranged from an object side to an image side, and when the working distance is changed, the air interval between the focusing group and the fixed group S3 is changed to focus;
the focusing group comprises a first lens group S1, a diaphragm (1) and a second lens group S2;
the first lens group S1 includes a first lens G1 having negative power and a meniscus structure, a second lens G2 having positive power and a biconvex structure, a third lens G3 having positive power and a biconvex structure, and a fourth lens G4 having negative power and a biconcave structure;
the second lens group S2 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, and a seventh lens G7 having positive power and a biconvex structure;
the fixed group S3 comprises an eighth lens G8 with negative focal power and a meniscus structure, and a ninth lens G9 with positive focal power and a biconvex structure;
The focal length f of the optical module, the focal length of the first lens group S1 is f 1, the focal length of the second lens group S2 is f 2, the ratio of the focal length of the fixed group S3 to f 3,f1 and f satisfies the relation, the ratio of 2.5< |f 1/f|＜5.0;f2 and f satisfies the relation, the ratio of 1.0< |f 2/f|＜2.0;f3 and f satisfies the relation, 2.0< |f 3/f| <3.0;
the distance from the ninth lens G9 of the optical module to the image surface (2), namely the optical back intercept BFL and the focal length f of the optical module, satisfy the relation of I BFL/f <1.0;
The half image height y' of the optical module and the focal length f of the optical module meet the relation of y/f <0.4;
the third lens G3 and the fourth lens G4 are glued to form a first glued lens group U1, and the ratio of the focal length f u1,fu1 to the focal length f 1 of the first glued lens group U1 meets the relation that 0.5< |f u1/f1 | <1.0;
The fifth lens G5 and the sixth lens G6 are glued to form a second glued lens group U2, and the ratio of the focal length of the second glued lens group U2 to the focal length of f u2,fu2 to the focal length of f 2 meets the relation of 1.0< |f u2/f2 | <1.5;
The eighth lens G8 and the ninth lens G9 are glued to form a third glued lens group U3, the focal length of the eighth lens G8 is f G8, the ratio of the focal lengths f G9,fG8 and f 3 of the ninth lens G9 satisfies the relation of 0.3< |f G8/f3|＜0.45,fG9 and f 3, and the ratio of 0.3< |f G9/f3 | <0.45.
2. The high resolution wide working distance low distortion industrial lens according to claim 1, wherein the refractive index of the first lens G1 is n1,1.45< n1<1.55.
3. The high resolution wide working distance low distortion industrial lens according to claim 1, wherein the refractive index of the second lens G2 is n2,1.75< n2<1.90.
4. The high resolution wide working distance low distortion industrial lens according to claim 1, wherein the refractive index of the seventh lens G7 is n7,1.85< n7<1.95.
5. The high resolution wide working distance low distortion industrial lens of claim 1, wherein each lens is a spherical mirror.
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| CN112014956B (en) * | 2020-10-14 | 2021-01-01 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| CN112649952B (en) * | 2020-12-30 | 2025-03-07 | 广东奥普特科技股份有限公司 | A high-resolution, large-field-of-view industrial lens |
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| US8045276B2 (en) * | 2008-01-22 | 2011-10-25 | E-Pin Optical Industry Co., Ltd. | Compact zoom lens with three lens groups and design method thereof |
| WO2015119252A1 (en) * | 2014-02-10 | 2015-08-13 | 株式会社ニコン | Imaging lens, optical device provided with same, and imaging lens production method |
| CN206532022U (en) * | 2016-12-16 | 2017-09-29 | 福建福光天瞳光学有限公司 | The low distortion light path system of high-resolution and its optics industry camera lens |
| CN107976789B (en) * | 2017-12-27 | 2023-07-07 | 东莞市宇瞳光学科技股份有限公司 | Large-field-angle machine vision lens |
| CN109683282B (en) * | 2019-01-17 | 2021-02-26 | 广东奥普特科技股份有限公司 | A Low Distortion Wide Angle Fixed Focus Line Scan Machine Vision Lens Optical System |
| CN109884773B (en) * | 2019-04-02 | 2023-12-05 | 奥普特视觉科技(苏州)有限公司 | Lens with low distortion and large target surface |
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