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CN111190269B - A high-resolution industrial lens - Google Patents

A high-resolution industrial lens Download PDF

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Publication number
CN111190269B
CN111190269B CN202010151588.6A CN202010151588A CN111190269B CN 111190269 B CN111190269 B CN 111190269B CN 202010151588 A CN202010151588 A CN 202010151588A CN 111190269 B CN111190269 B CN 111190269B
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lens
focal length
lens group
optical module
relationship
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CN111190269A (en
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曾振煌
林佳敏
卢盛林
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Guangdong OPT Machine Vision Co Ltd
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Guangdong OPT Machine Vision Co Ltd
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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
    • 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
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

本发明属于镜头技术领域，具体涉及一种高解析度工业镜头，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第一透镜组S1、第二透镜组S2、光阑和第三透镜组S3，光学模组的焦距f，第一透镜组S1的焦距为fs1，第二透镜组S2的焦距为fs2，第三透镜组S3的焦距为fs3，2.5＜|fs1/f|＜3.5；2.0＜|fs2/f|＜3.0；0.5＜|fs3/f|＜1.0。本发明实现了焦距为16mm的高解析度工业镜头的光学模组，像方F数为2.8，最大成像面为φ9mm，最高分辨率可达230lp/mm，全视场最大光学畸变低于0.25％。

The present invention belongs to the field of lens technology, and specifically relates to a high-resolution industrial lens, including a mechanical device and an optical module installed inside the mechanical device, wherein the optical module is sequentially provided with a first lens group S1, a second lens group S2, an aperture and a third lens group S3 from the object side to the image side, and the focal length f of the optical module, the focal length of the first lens group S1 is fs1 , the focal length of the second lens group S2 is fs2 , and the focal length of the third lens group S3 is fs3 , 2.5＜| fs1 /f|＜3.5; 2.0＜|fs2/ f |＜3.0; 0.5＜| fs3/f |＜1.0. The present invention realizes an optical module of a high-resolution industrial lens with a focal length of 16mm, an image side F number of 2.8, a maximum imaging surface of φ9mm, a maximum resolution of up to 230lp/mm, and a maximum optical distortion of the entire field of view of less than 0.25%.

Description

High-resolution industrial lens
Technical Field
The invention belongs to the technical field of industrial lenses, and particularly relates to a high-resolution industrial lens.
Background
The industrial lens is also continuously developed under the drive of industry 4.0. However, as application requirements continue to increase, requirements for industrial lenses are also increasing. In particular, in the applications of touch screen circuit positioning monitoring, glass scratch detection, food color selection and the like, the requirements on optical distortion, resolution and the like of an industrial lens are higher and higher, and meanwhile, the pixels of a camera chip matched with the lens tend to be miniaturized, and small-pixel high-pixel chips are continuously emerging.
At present, the resolution of the machine vision lens on the market is 150lp/mm, the resolution of the lens is 500 tens of thousands, the requirement of higher resolution cannot be met, the resolution of the lens is more than 1000 tens of thousands, the distortion is only <0.5%, the existing requirement cannot be met, and the resolution of the lens is 150lp/mm, as in the patent with the patent number of '201611170973.5'.
In addition, the existing domestic industrial lenses are generally designed aiming at large-pixel chips, and the industrial lenses with small target surfaces and high pixels are few. Therefore, the development of small-pixel high-pixel low-distortion industrial lenses is more urgent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention develops the industrial lens with higher resolution, the highest resolution can reach 230lp/mm, the industrial lens can be matched with a 2.2 mu m pixel chip, and the industrial lens optical module with low distortion and high resolution has good chromatic aberration correction capability.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The high-resolution industrial lens comprises a mechanical device and an optical module arranged in the mechanical device, wherein the optical module is sequentially provided with a first lens group S1, a second lens group S2, a diaphragm and a third lens group S3 from an object side to an image side;
the first lens group S1 comprises a first lens G1 with negative focal power and a meniscus structure, and a second lens G2 with positive focal power and a biconvex structure;
the second lens group S2 comprises a third lens G3 with positive focal power and a meniscus structure, and a fourth lens G4 with negative focal power and a meniscus structure;
the third lens group S3 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, a seventh lens G7 having positive power and a meniscus structure, and an eighth lens G8 having positive power and a meniscus structure;
The third lens G3 and the fourth lens G4 are glued to form a first glued lens group U1 with negative focal power, and the fifth lens G5 and the sixth lens G6 are glued to form a second glued lens group U2 with positive focal power;
The focal length f of the optical module, the focal length of the first lens group S1 is f s1, the focal length of the second lens group S2 is f s2, the ratio of the focal length of the third lens group S3 to f s3,fs1 and f satisfies the relation, the ratio of 2.5< |f s1/f|＜3.5;fs2 and f satisfies the relation, the ratio of 2.0< |f s2/f|＜3.0;fs3 and f satisfies the relation, 0.5< |f s3/f| < 1.0.
As an improvement of the high-resolution industrial lens, the relation between the distance L between the vertex of the first lens G1 close to the object side surface and the vertex of the eighth lens G8 close to the image side surface and the focal length f of the optical module is 1.2< |L/f|.
As an improvement of the high-resolution industrial lens, the distance from the eighth lens G8 of the optical module to the image plane, namely the optical back intercept BFL, and the focal length f of the optical module meet the relation of I BFL/f <1.2.
As an improvement of the high-resolution 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 <0.30.
As an improvement of the high-resolution industrial lens of the present invention, the refractive index of the first lens G1 is n1,1.85< n1<1.95, and the refractive index of the second lens G2 is n2,1.75< n2<1.90. The first lens group S1 belongs to a positive and negative focal power separation structure, and can effectively reduce the influence of field curvature on image quality.
As an improvement of the high-resolution industrial lens, the focal length of the third lens G3 is f G3, the ratio of the focal lengths f G4,fG3 and f s2 of the fourth lens G4 satisfies the relation of 0.6< |f G3/fs2|＜0.90,fG4 and f s2, and the ratio of 0.20< |f G4/fs2 | <0.45.
As an improvement of the high-resolution industrial lens, the ratio of the focal length f u2,fu2 to the focal length f s3 of the second cemented lens group U2 satisfies the relation of 27.0< |f u2/fs3 | <30.0, the refractive index of the fifth lens is n5, and the refractive index of the sixth lens is n6,1.75< n5<1.85,1.40< n6<1.55.
As an improvement of the high-resolution industrial lens according to the present invention, the refractive index of the seventh lens G7 is n7, and the refractive index of the eighth lens G8 is n8,1.65< n7, n8<1.80.
As an improvement of the high-resolution industrial lens, each lens is a spherical lens.
As an improvement of the high-resolution industrial lens, the aperture of the diaphragm is a round hole, and the aperture of the diaphragm is adjustable within the range of F2.8-F16
The invention has the advantages that the optical module of the high-resolution industrial lens with the focal length of 16mm is realized through the structure, the F number of an image space is 2.8, the maximum imaging surface is phi 9mm, the highest resolution can reach 230lp/mm, the optical module can be matched with a 2.2 mu m pixel chip, the maximum optical distortion of the whole field of view is lower than 0.25 when the corresponding 1/1.8'' chip is adopted, and the clear aperture can be flexibly adjusted by adopting a whole group of focusing modes.
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 graph showing optical distortion of a lens optical module according to an embodiment;
In the figure, a 1-diaphragm, a 2-image plane, 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 U1-first cemented lens group, a U2-second cemented lens group, a S1-first lens group, a S2-second lens group and a S3-third lens group are shown.
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 high-resolution industrial lens, which includes a mechanical device and an optical module installed inside the mechanical device, wherein the optical module sequentially includes a first lens group S1, a second lens group S2, a diaphragm 1 and a third lens group S3 from an object side to an image side;
The first lens group S1 comprises a first lens G1 with negative focal power and a meniscus structure, and a second lens G2 with positive focal power and a biconvex structure;
The second lens group S2 includes a third lens G3 having positive power and a meniscus structure, and a fourth lens G4 having negative power and a meniscus structure;
The third lens group S3 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, a seventh lens G7 having positive power and a meniscus structure, and an eighth lens G8 having positive power and a meniscus structure;
The third lens G3 and the fourth lens G4 are glued to form a first glued lens group U1 with negative focal power, and the fifth lens G5 and the sixth lens G6 are glued to form a second glued lens group U2 with positive focal power;
The focal length f of the optical module, the focal length of the first lens group S1 is f s1, the focal length of the second lens group S2 is f s2, the ratio of the focal lengths of the third lens group S3 to f s3,fs1 and f satisfies the relation that the ratio of 2.5< |f s1/f|＜3.5;fs2 to f satisfies the relation that the ratio of 2.0< |f s2/f|＜3.0;fs3 to f satisfies the relation that 0.5< |f s3/f| < 1.0.
Further, the distance L between the vertex of the first lens G1 close to the object side surface and the vertex of the eighth lens G8 close to the image side surface and the focal length f of the optical module satisfy the relation of 1.2< |L/f|.
Further, the distance between the eighth lens G8 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 <1.2.
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 <0.30.
Further, the refractive index of the first lens G1 is n1,1.85< n1<1.95, and the refractive index of the second lens G2 is n2,1.75< n2<1.90. The first lens group S1 belongs to a positive and negative focal power separation structure, and can effectively reduce the influence of field curvature on image quality.
Further, the focal length of the third lens G3 is f G3, the ratio of the focal length of the fourth lens G4 to the focal length of f G4,fG3 and f s2 satisfies the relation of 0.6< |f G3/fs2|＜0.90,fG4 and f s2, and the ratio of 0.20< |f G4/fs2 | <0.45.
Further, the ratio of the focal lengths f u2,fu2 and f s3 of the second cemented lens group U2 satisfies the relation of 27.0< |f u2/fs3 | <30.0, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6,1.75< n5<1.85,1.40< n6<1.55.
Further, the refractive index of the seventh lens G7 is n7, the refractive index of the eighth lens G8 is n8,1.65< n7, n8<1.80.
Further, each lens is a spherical mirror.
Further, the aperture of the diaphragm 1 is a round hole, and the aperture of the diaphragm 1 is adjustable within the range of F2.8-F16.
The specific optical module data are as follows:
in this embodiment, the focal length F of the optical module is 16mm, the maximum aperture is f# =2.8,
The focal length f S1 =48.2 mm of the first lens group S1, the focal length f S2 = -36.3mm of the second lens group S2, the focal length f S3 =11.7 mm of the third lens group S3, the distance l=34.8 mm of the front surface vertex of the first lens G1 to the rear surface vertex of the eighth lens G8, the optical back intercept bfl=13.5 mm, the half image height y' =4.5 mm, the focal length f G3 =27.4 mm of the third lens G3, the focal length f G4 = -12.1mm of the fourth lens G4, and the focal length f U2 =339.8 mm of the second cemented lens group.
Each relation |f S1/f|＝3.01;|fS2/f|＝2.26;|fS3/f|=0.73;
|L/f|=2.17;|BFL/f|=0.84;|y’/f|=0.28;|fG3/fS2|=0.75;
|fG4/fS2|＝0.33;|fU2/fS3|=29.04。
the relation is satisfied:
2.5<|fS1/f|<3.5;2.0<|fS2/f|<3.0;0.5<|fS3/f|<1.0;
|L/f|>1.2;|BFL/f|<1.2;|y’/f|<0.35;0.6<|fG3/fS2|<0.90;
0.20<|fG4/fS2|＜0.45;27.0＜|fU2/fS3|<30.0。
FIG. 2 is a graph showing the optical distortion of the present embodiment, wherein the maximum optical distortion is less than 0.25% over the full field of view;
The optical module of the high-resolution industrial lens with the focal length of 16mm is realized through the structure, the F number of an image space is 2.8, the maximum imaging surface is phi 9mm, the highest resolution can reach 230lp/mm, 2.2 mu m pixel chips can be matched, when the corresponding 1/1.8' chip is adopted, the pixel can reach 500 ten thousand pixels, the maximum optical distortion of the whole field of view is lower than 0.25%, and the clear aperture can be flexibly adjusted by adopting a whole group of focusing modes.
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 (6)

1.一种高解析度工业镜头，其特征在于：包括机械装置及安装于所述机械装置内部的光学模组，所述光学模组由物方到像方依次设置第一透镜组S1、第二透镜组S2、光阑(1)和第三透镜组S3；1. A high-resolution industrial lens, characterized in that it comprises a mechanical device and an optical module installed inside the mechanical device, wherein the optical module is provided with a first lens group S1, a second lens group S2, an aperture (1) and a third lens group S3 in sequence from the object side to the image side; 所述第一透镜组S1包括具有负光焦度及弯月结构的第一透镜G1、具有正光焦度及双凸结构的第二透镜G2；The first lens group S1 includes a first lens G1 with negative optical power and a meniscus structure, and a second lens G2 with positive optical power and a biconvex structure; 所述第二透镜组S2包括具有正光焦度及弯月结构的第三透镜G3、具有负光焦度及弯月结构的第四透镜G4；The second lens group S2 includes a third lens G3 with positive optical power and a meniscus structure, and a fourth lens G4 with negative optical power and a meniscus structure; 所述第三透镜组S3包括具有负光焦度及双凹结构的第五透镜G5、具有正光焦度及双凸结构的第六透镜G6、具有正光焦度及弯月结构的第七透镜G7、具有正光焦度及弯月结构的第八透镜G8；The third lens group S3 includes a fifth lens G5 with negative power and a biconcave structure, a sixth lens G6 with positive power and a biconvex structure, a seventh lens G7 with positive power and a meniscus structure, and an eighth lens G8 with positive power and a meniscus structure. 所述第三透镜G3与所述第四透镜G4胶合组成具有负光焦度的第一胶合透镜组U1，所述第五透镜G5与所述第六透镜G6胶合组成具有正光焦度的第二胶合透镜组U2；The third lens G3 and the fourth lens G4 are cemented together to form a first cemented lens group U1 with negative power, and the fifth lens G5 and the sixth lens G6 are cemented together to form a second cemented lens group U2 with positive power; 所述光学模组的焦距f，所述第一透镜组S1的焦距为fs1，所述第二透镜组S2的焦距为fs2，所述第三透镜组S3的焦距为fs3，fs1和f的比值满足关系式：2.5＜|fs1/f|＜3.5；fs2和f的比值满足关系式：2.0＜|fs2/f|＜3.0；fs3和f的比值满足关系式：0.5＜|fs3/f|＜1.0；The focal length f of the optical module, the focal length of the first lens group S1 is fs1 , the focal length of the second lens group S2 is fs2 , the focal length of the third lens group S3 is fs3 , the ratio of fs1 to f satisfies the relationship: 2.5＜| fs1 /f|＜3.5; the ratio of fs2 to f satisfies the relationship: 2.0＜| fs2 /f|＜3.0; the ratio of fs3 to f satisfies the relationship: 0.5＜| fs3 /f|＜1.0; 所述第一透镜G1靠近所述物方表面的顶点到所述第八透镜G8靠近所述像方表面的顶点之间的距离L与所述光学模组的焦距f，满足关系式：1.2＜|L/f|；The distance L between the vertex of the first lens G1 close to the object-side surface and the vertex of the eighth lens G8 close to the image-side surface and the focal length f of the optical module satisfy the relationship: 1.2<|L/f|; 所述光学模组的第八透镜G8到像面(2)的距离即光学后截距BFL与所述光学模组的焦距f，满足关系式：|BFL/f|＜1.2；The distance between the eighth lens G8 of the optical module and the image plane (2), i.e., the optical back focus BFL, and the focal length f of the optical module satisfy the relationship: |BFL/f|<1.2; 所述光学模组的半像高y’与所述光学模组的焦距f，满足关系式：|y’/f|＜0.30；The half image height y' of the optical module and the focal length f of the optical module satisfy the relationship: |y'/f|＜0.30; 所述第三透镜G3的焦距为fG3，所述第四透镜G4的焦距为fG4，fG3和fs2的比值满足关系式：0.6＜|fG3/fs2|＜0.90，fG4和fs2的比值满足关系式：0.20＜|fG4/fs2|＜0.45。The focal length of the third lens G3 is f G3 , the focal length of the fourth lens G4 is f G4 , the ratio of f G3 to f s2 satisfies the relationship: 0.6＜|f G3 /f s2 |＜0.90, and the ratio of f G4 to f s2 satisfies the relationship: 0.20＜|f G4 /f s2 |＜0.45. 2.根据权利要求1所述的高解析度工业镜头，其特征在于：所述第一透镜G1的折射率为n1，1.85＜n1＜1.95；所述第二透镜G2的折射率为n2，1.75＜n2＜1.90。2. The high-resolution industrial lens according to claim 1, characterized in that: the refractive index of the first lens G1 is n1, 1.85＜n1＜1.95; the refractive index of the second lens G2 is n2, 1.75＜n2＜1.90. 3.根据权利要求1所述的高解析度工业镜头，其特征在于：所述第二胶合透镜组U2的焦距为fu2，fu2和fs3的比值满足关系式：27.0＜|fu2/fs3|＜30.0，所述第五透镜的折射率为n5，所述第六透镜的折射率为n6，1.75＜n5＜1.85，1.40＜n6＜1.55。3. The high-resolution industrial lens according to claim 1 is characterized in that the focal length of the second cemented lens group U2 is fu2 , the ratio of fu2 to fs3 satisfies the relationship: 27.0＜| fu2 / fs3 |＜30.0, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, 1.75＜n5＜1.85, 1.40＜n6＜1.55. 4.根据权利要求1所述的高解析度工业镜头，其特征在于：所述第七透镜G7的折射率为n7，所述第八透镜G8的折射率为n8，1.65＜n7、n8＜1.80。4 . The high-resolution industrial lens according to claim 1 , wherein the refractive index of the seventh lens G7 is n7, the refractive index of the eighth lens G8 is n8, and 1.65＜n7, n8＜1.80. 5.根据权利要求1所述的高解析度工业镜头，其特征在于：所述的各个透镜均为球面镜。5. The high-resolution industrial lens according to claim 1, characterized in that each of the lenses is a spherical lens. 6.根据权利要求1所述的高解析度工业镜头，其特征在于：所述光阑(1)孔径为圆孔，所述光阑(1)的光圈在F2.8～F16范围内可调。6. The high-resolution industrial lens according to claim 1, characterized in that the aperture of the diaphragm (1) is a circular hole, and the aperture of the diaphragm (1) is adjustable within the range of F2.8 to F16.
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