CN108594401B - Large target surface fixed focus machine vision linear array lens - Google Patents

Large target surface fixed focus machine vision linear array lens Download PDF

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Publication number
CN108594401B
CN108594401B CN201810636187.2A CN201810636187A CN108594401B CN 108594401 B CN108594401 B CN 108594401B CN 201810636187 A CN201810636187 A CN 201810636187A CN 108594401 B CN108594401 B CN 108594401B
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lens
target surface
machine vision
linear array
fixed focus
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CN108594401A (en
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卢盛林
曾振煌
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Abstract

The invention discloses a large target surface fixed focus machine vision linear array lens, wherein an optical system of the lens sequentially comprises a first lens with positive focal power and a meniscus structure from an object side to an image side, a second lens with positive focal power and a meniscus structure, a third lens with negative focal power and a meniscus structure, a fourth lens with positive focal power and a biconvex structure, a fifth lens with negative focal power and a biconcave structure, a sixth lens with negative focal power and a biconcave structure and a seventh lens with positive focal power and a biconvex structure; the focal length of the optical system is f ', the target surface half image height of the optical system is y', and the relation is satisfied: the y '/f' | is more than or equal to 0.45. The structure realizes that when the focal length is 29mm and the corresponding chip size is 30mm, the main magnification is 0.10X, and the available magnification is 0.04X-0.33X. Within the available magnification range, clear imaging can be achieved by changing the object distance of the lens and adjusting the rear intercept.

Description

Large target surface fixed focus machine vision linear array lens
Technical Field
The invention relates to the technical field of machine vision lenses, in particular to a large target surface fixed focus machine vision linear array lens.
Background
Machine vision is the measurement and judgment of using a machine instead of a human eye. The machine vision system is used for converting the shot target into image signals through an image shooting device (divided into CMOS and CCD), transmitting the image signals to a special image processing system, and converting the image signals into digital signals according to the pixel distribution, brightness, color and other information; the image system performs various operations on these signals to extract characteristics of the object, and further controls the operation of the on-site device according to the result of the discrimination.
The image pickup devices are classified into a line array type and a plane array type according to the chip type. In the field of high-precision measurement, a line camera is generally used, and a typical application field is to detect defects of the size or surface of a material, such as metal, plastic, paper, fiber, and the like. The object to be detected is usually in uniform motion, and is scanned continuously row by using one or more cameras, and when scanning, a single-row image can be processed, or a planar array image formed by a plurality of rows can be processed. Because of the high resolution of the line camera sensor, its measurement accuracy can reach the micrometer level.
The traditional fixed focus machine vision linear array lens is difficult to have good resolution and lower distortion; meanwhile, the large-view-field design cannot effectively reduce the space required by installation, the resolution of the traditional lens can greatly change along with the change of the magnification, and the imaging performance is stable or not in the available magnification.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the large target surface fixed focus machine vision linear array lens has good resolution and lower distortion when being matched with a large target surface camera; meanwhile, the large view field design can effectively reduce the space required by installation; unlike conventional lenses, which have a resolution that varies greatly with magnification, the lens has a relatively stable imaging performance within the available magnification.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the large target surface fixed focus machine vision linear array lens comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system sequentially comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with negative focal power and a meniscus structure, a fourth lens G4 with positive focal power and a biconvex structure, a fifth lens G5 with negative focal power and a biconcave structure, a sixth lens G6 with negative focal power and a biconcave structure and a seventh lens G7 with positive focal power and a biconvex structure from an object side to an image side; the second lens G2 and the third lens G3 form a first cemented lens B1 with negative optical power, the fourth lens G4 and the fifth lens G5 form a second cemented lens B2 with positive optical power, and the sixth lens G6 and the seventh lens G7 form a third cemented lens B3 with positive optical power; the focal length of the optical system is f ', the target surface half image height of the optical system is y', and the relation is satisfied: the y '/f' | is more than or equal to 0.45.
As an improvement of the large target surface fixed focus machine vision linear array lens, the focal length of the optical system is f ', and the relation between the focal length f' of the optical system and the focal length f1 of the first lens is as follows: 1< |f1/f' | <1.5; the focal length of the first cemented lens B1 is fB1, the focal length of the first cemented lens B2 is fB2, and the focal length of the first cemented lens B3 is fB3, which satisfies the following relation: 0.7< |fB1/f' | <0.86;0.7< |fB2/f' | <0.86;1< |fB3/f' | <1.29;0.9< |fB1/fB2| <1.1;0.55< |fB1/fB3| <0.86;0.55< |fB2/fB3| <0.86.
As an improvement of the large target surface fixed focus machine vision linear array lens, the refractive index of the first lens G1 is n1, the Abbe number is v1, and the refractive index meets the relation: 1.95< n1<2.05;20< v1<30.
As an improvement of the large target surface fixed focus machine vision linear array lens, the refractive index of the second lens G2 is n2, the Abbe number is v2, and the refractive index meets the relation: 1.55< n2<1.65;60< v2<70.
As an improvement of the large target surface fixed focus machine vision linear array lens, the refractive index of the third lens G3 is n3, the Abbe number is v3, and the refractive index meets the relation: 1.75< n3<1.85;20< v3<30.
As an improvement of the large target surface fixed focus machine vision linear array lens, the refractive index of the fourth lens G4 is n4, the Abbe number is v4, and the relation formula is satisfied: 1.95< n4<2.05;20< v4<30.
As an improvement of the large target surface fixed focus machine vision linear array lens, the refractive index of the fifth lens G5 is n5, the Abbe number is v5, and the relation formula is satisfied: 1.45< n5<1.55;60< v5<70.
As an improvement of the large target surface fixed focus machine vision linear array lens, the refractive index of the sixth lens G5 is n6, the Abbe number is v6, and the relation formula is satisfied: 1.8< n6<1.9;20< v6<30.
As an improvement of the large target surface fixed focus machine vision linear array lens, the refractive index of the seventh lens G7 is n7, the Abbe number is v7, and the relation formula is satisfied: 1.65< n7<1.75;50< v7<60.
As an improvement of the large target surface fixed focus machine vision linear array lens, the invention further comprises a diaphragm, wherein the diaphragm is arranged between the third lens G3 and the fourth lens G4, 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 beneficial effects that: the invention can have good resolution and lower distortion when matching with a large target camera; meanwhile, the large view field design can effectively reduce the space required by installation; unlike conventional lenses, which have a resolution that varies greatly with magnification, the lens has a relatively stable imaging performance within the available magnification. The method realizes that when the focal length is 29mm and the corresponding chip size is 30mm, the main magnification is 0.10X, and the available magnification is 0.04X-0.33X; within the available magnification range, clear imaging can be achieved by changing the object distance of the lens and adjusting the rear intercept. Wherein, at nominal magnification, the full field distortion is less than 0.2%.
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 schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of an optical system according to the present invention;
FIG. 3 is a graph of MTF for an optical system of the present invention;
FIG. 4 is a graph of field curvature of an optical system according to the present invention;
fig. 5 is a graph of distortion of an optical system of the present invention.
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; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be 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.
As shown in fig. 1 to 5, a large target surface fixed focus machine vision linear array lens comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system sequentially comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with negative focal power and a meniscus structure, a fourth lens G4 with positive focal power and a biconvex structure, a fifth lens G5 with negative focal power and a biconcave structure, a sixth lens G6 with negative focal power and a seventh lens G7 with positive focal power and a biconvex structure from an object side to an image side; the second lens G2 and the third lens G3 form a first cemented lens B1 with negative focal power, the fourth lens G4 and the fifth lens G5 form a second cemented lens B2 with positive focal power, and the sixth lens G6 and the seventh lens G7 form a third cemented lens B3 with positive focal power; the focal length of the optical system is f ', the target surface half image height of the optical system is y', and the relation is satisfied: the y '/f' | is more than or equal to 0.45.
Preferably, the focal length of the optical system is f', and the relation between the focal length f1 of the first lens is satisfied: 1< |f1/f' | <1.5; the focal length of the first cemented lens B1 is fB1, the focal length of the first cemented lens B2 is fB2, and the focal length of the first cemented lens B3 is fB3, which satisfies the following relation: 0.7< |fB1/f' | <0.86;0.7< |fB2/f' | <0.86;1< |fB3/f' | <1.29;0.9< |fB1/fB2| <1.1;0.55< |fB1/fB3| <0.86;0.55< |fB2/fB3| <0.86.
Preferably, the refractive index of the first lens G1 is n1, the abbe number is v1, which satisfies the relation: 1.95< n1<2.05;20< v1<30.
Preferably, the refractive index of the second lens G2 is n2, the abbe number is v2, which satisfies the relation: 1.55< n2<1.65;60< v2<70.
Preferably, the refractive index of the third lens G3 is n3, the abbe number is v3, which satisfies the relation: 1.75< n3<1.85;20< v3<30.
Preferably, the fourth lens G4 has a refractive index n4 and an abbe number v4, which satisfy the relation: 1.95< n4<2.05;20< v4<30.
Preferably, the refractive index of the fifth lens G5 is n5, the abbe number is v5, which satisfies the relation: 1.45< n5<1.55;60< v5<70.
Preferably, the refractive index of the sixth lens G5 is n6, the abbe number is v6, which satisfies the relation: 1.8< n6<1.9;20< v6<30.
Preferably, the refractive index of the seventh lens G7 is n7, the abbe number is v7, which satisfies the relation: 1.65< n7<1.75;50< v7<60.
The invention also comprises a diaphragm 100, wherein the diaphragm 100 is arranged between the third lens G3 and the fourth lens G4, the aperture of the diaphragm 100 is a round hole, and the aperture of the diaphragm 100 is adjustable within the range of F2.8-F16.
In the present embodiment, parameters of the optical system are as follows:
surface of the body Radius (mm) Thickness (mm) Refractive index Abbe number
Front curved surface of first lens G1 22.2 2.9 2.0 28.5
Back curved surface of first lens G1 48.5 0.1
Front curved surface of the second lens G2 10.8 4.8 1.6 65.5
Front curve of third lens G3 106.8 1.0 1.8 25.5
Back curved surface of third lens G3 6.9 4.2
Diaphragm Infinity of infinity 1.8
Front curve of third lens G4 39.9 3.0 2.0 25.5
Front curve of fifth lens G5 -18.4 1.6 1.5 66.0
Back curved surface of fifth lens G5 30.4 1.2
Front curve of the sixth lens G6 -29.3 1 1.8 24.0
Front curve of seventh lens G7 18.1 5.7 1.7 54.5
Back surface of seventh lens G7 -12.5
Image plane Infinity of infinity
f1 fB1 fB2 fB3 f’ y’
38.3mm -27.4mm 27.1mm 39.3mm 29mm 15mm
|fB1/fB2| |fB1/fB3| |fB2/fB3|
1.01 0.70 0.69
Through the structure, when the focal length is 29mm and the corresponding chip size is 30mm, the main magnification is 0.10X, and the available magnification is 0.04X-0.33X. Within the available magnification range, clear imaging can be achieved by changing the object distance of the lens and adjusting the rear intercept. Wherein, at nominal magnification, the full field distortion is less than 0.2%. As shown in FIG. 3, the optical system of the embodiment has a full field MTF value of > 0.3,0.8 field MTF value of > 0.4 at 40lp/mm, and can be matched with an imaging chip with a pixel size of 12.5 μm or more. As shown in fig. 4, the image plane of the present embodiment is of the size ofThe image points of the whole field of view are all within the range of 0.4mm of the image plane position, which means that the optical system of the embodiment has smaller image plane curvature. As shown in FIG. 5, the distortion of the full field of view of the embodiment is controlled within + -0.05%, which indicates that the system distortion is small and meets the requirements of vision application.
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 (10)

1. The large target surface fixed focus machine vision linear array lens is characterized in that: the lens system comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system sequentially comprises a first lens G1 with positive focal power and a meniscus structure from an object side to an image side, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with negative focal power and a meniscus structure, a fourth lens G4 with positive focal power and a biconvex structure, a fifth lens G5 with negative focal power and a biconcave structure, a sixth lens G6 with negative focal power and a seventh lens G7 with positive focal power and a biconvex structure; the second lens G2 and the third lens G3 form a first cemented lens B1 with negative optical power, the fourth lens G4 and the fifth lens G5 form a second cemented lens B2 with positive optical power, and the sixth lens G6 and the seventh lens G7 form a third cemented lens B3 with positive optical power; the focal length of the optical system is f ', the target surface half image height of the optical system is y', and the relation is satisfied: the y '/f' | is more than or equal to 0.45.
2. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the focal length of the optical system is f', and the relation between the focal length f1 of the first lens is satisfied: 1< |f1/f' | <1.5; the focal length of the first cemented lens B1 is fB1, the focal length of the second cemented lens B2 is fB2, and the focal length of the third cemented lens B3 is fB3, which satisfies the following relation: |fb1/f' |= | -27/4| 29|. |fb2/f' |= |27/29|. Ib 3/f' |= |39/29|. 0.9< |fB1/fB2| <1.1;0.55< |fB1/fB3| <0.86;
0.55<|fB2/fB3|<0.86。
3. the large target surface fixed focus machine vision linear array lens of claim 1, wherein: the refractive index of the first lens G1 is n1, the abbe number is v1, which satisfies the relation: 1.95< n1<2.05;20< v1<30.
4. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the refractive index of the second lens G2 is n2, the abbe number is v2, which satisfies the relation: 1.55< n2<1.65;60< v2<70.
5. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the refractive index of the third lens G3 is n3, the abbe number is v3, which satisfies the relation: 1.75< n3<1.85;20< v3<30.
6. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the refractive index of the fourth lens G4 is n4, the abbe number is v4, which satisfies the relation: 1.95< n4<2.05;20< v4<30.
7. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the refractive index of the fifth lens G5 is n5, the abbe number is v5, which satisfies the relation: 1.45< n5<1.55;60< v5<70.
8. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the refractive index of the sixth lens G5 is n6, the abbe number is v6, which satisfies the relation: 1.8< n6<1.9;20< v6<30.
9. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the refractive index of the seventh lens G7 is n7, the abbe number is v7, which satisfies the relation: 1.65< n7<1.75;50< v7<60.
10. The large target surface fixed focus machine vision linear array lens of claim 1, wherein: the lens further comprises a diaphragm, the diaphragm is arranged between the third lens G3 and the fourth lens G4, the aperture of the diaphragm is a round hole, and the aperture of the diaphragm is adjustable within the range of F2.8-F16.
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