CN112612130A - High-resolution industrial lens - Google Patents
High-resolution industrial lens Download PDFInfo
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- CN112612130A CN112612130A CN202011616497.1A CN202011616497A CN112612130A CN 112612130 A CN112612130 A CN 112612130A CN 202011616497 A CN202011616497 A CN 202011616497A CN 112612130 A CN112612130 A CN 112612130A
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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
- G02B15/177—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 negative front lens or group of lenses
Abstract
The invention belongs to the technical field of optical imaging, and particularly discloses a high-resolution industrial lens, which comprises an optical module, wherein the optical module is sequentially provided with a front lens group, a diaphragm and a rear focusing group from an object space to an image space; wherein, the focal length of optical module is f, the focal length of preceding lens group is fS1, and the combined focal length of back focusing group is fS2, and it satisfies the relation: 1.2< | fS1/f | < 2.2; 1< | fS2/f | <2. According to the high-resolution industrial lens, the number of an image space F is 2.8, the high-resolution industrial lens can be matched with a 1.1' inch camera when the focal length is 12mm, the maximum pixel can reach two thousand three million pixels, high-quality imaging is realized, meanwhile, the high-resolution industrial lens adopts a focusing mode of floating focusing, the clear aperture can be flexibly adjusted, and the contradiction between the telecentricity and low distortion of an optical system is effectively balanced.
Description
Technical Field
The invention belongs to the technical field of optical imaging, and particularly relates to a high-resolution industrial lens.
Background
Under the drive of industry 4.0, industrial lenses are continuously developed and advanced, optical lenses are more and more widely applied, particularly, in the field of detection application, for example, dimension measurement, stitch positioning, PCB defect detection, floor tile surface texture, color detection and the like all adopt machine vision detection, a machine vision system is used for converting a target to be detected into digital quantity signals through a machine vision product (namely, an image pickup device, which is divided into a CMOS (complementary metal oxide semiconductor) and a CCD (charge coupled device)) and then transmitting the digital quantity signals to a special image processing system (divided into an embedded mode and a video card mode), and the image processing system sets a detection task according to the requirement of the target to be detected. And then, the on-site equipment action is controlled according to the judgment result, and the functions of positioning, judging, identifying, detecting, controlling and the like are realized. Once the information is severely lost in the imaging system, it is very difficult to try to recover in the later stage.
The continuously improved detection precision requirement and the wide application of the high-resolution camera put new requirements on the imaging quality and performance of the industrial lens, particularly on the aspects of the field of view, the resolution and the like; meanwhile, the pixels of the camera chip tend to be large, and a high-pixel 1.1' chip is one of the mainstream chips at present.
However, the number of optical lenses designed for 1.1 ″ chips in China is small, and the optical lenses are insufficient in resolution, lens size and the like, and especially, imaging at a short distance is insufficient. Therefore, the development of the optical lens with high pixel and low distortion is more urgent.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the high-resolution industrial lens is provided, and the application requirements are met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-resolution industrial lens comprises an optical module, wherein the optical module is sequentially provided with a front lens group, a diaphragm and a rear focusing group from an object side to an image side; the front lens group includes a first lens having negative power, a second lens having positive power, a third lens having negative power, a fourth lens having negative power, a fifth lens having positive power, and a sixth lens having positive power; the diaphragm is arranged between the front lens group and the rear focusing group; the back focusing group comprises a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power and a twelfth lens with positive focal power;
the focal length of the optical module is f, the focal length of the front lens group is fS1, the combined focal length of the rear focusing group is fS2, and the relationship is satisfied: 1.2< | fS1/f | < 2.2; 1< | fS2/f | <2.
As an improvement of the high resolution industrial lens according to the invention, the first lens is a meniscus structure, and the focal length of the first lens is fG 1; the second lens is of a biconvex structure, and the focal length of the second lens is fG 2; the third lens is of a meniscus structure, and the focal length of the third lens is fG 3; the fourth lens is of a biconcave structure, and the focal length of the fourth lens is fG 4; the fifth lens is of a biconvex structure, and the focal length of the fifth lens is fG 5; the sixth lens is of a meniscus structure, and the focal length of the sixth lens is fG 6; the seventh lens is of a biconvex structure, and the focal length of the seventh lens is fG 7; the eighth lens is of a biconcave structure, and the focal length of the eighth lens is fG 8; the ninth lens is of a biconvex structure, and the focal length of the ninth lens is fG 9; the tenth lens is of a meniscus structure, and the focal length of the tenth lens is fG 10; the eleventh lens is of a meniscus structure, and the focal length of the eleventh lens is fG 11; the twelfth lens is of a biconvex structure, and the focal length of the twelfth lens is fG 12.
The first lens, the second lens and the third lens are applicable to a large-field optical system in a structural form, and are used for correcting distortion and reducing the size of the optical system.
As an improvement of the high-resolution industrial lens according to the present invention, the fourth lens and the fifth lens constitute a first cemented lens, and a focal length of the first cemented lens is fU 1; the eighth lens and the ninth lens form a second cemented lens, and the focal length of the second cemented lens is fU 2; the tenth lens and the eleventh lens constitute a third cemented lens having a focal length fU 3.
As an improvement of the high-resolution industrial lens according to the present invention, ratios of the focal length fG1 of the first lens, the focal length fG2 of the second lens, the focal length fG3 of the third lens, the focal length fG6 of the sixth lens to the focal length fS1 of the front lens group respectively satisfy the following relations:
1.7<|fG1/fS1|<2.7；1.4<|fG2/fS1|<2.4；
0.5<|fG3/fS1|<1.2；0.8<|fG6/fS1|<1.8。
as an improvement of a high-resolution industrial lens according to the present invention, a ratio of a focal length fU1 of the first cemented lens and a focal length fS1 of the front lens group satisfies the relation: 6.2< | fU1/fS1| < 8.2.
As an improvement of the high-resolution industrial lens according to the present invention, a ratio of the focal length fU2 of the second cemented lens to the focal length fS2 of the rear focusing group satisfies the relation: 0.4< | fU2/fS2| < 1.4.
As an improvement of the high-resolution industrial lens according to the present invention, a ratio of a focal length fU3 of the third cemented lens to a focal length fS2 of the rear focusing group satisfies the relation: 2< | fU3/fS2| < 3.
As an improvement of the high-resolution industrial lens according to the present invention, ratios of the focal length fG7 of the seventh lens and the focal length fG12 of the twelfth lens to the focal length fS2 of the rear focusing group, respectively, satisfy the following relation:
1.35<|fG7/fS2|<2.35；0.6<|fG12/fS2|<1.6。
as an improvement of the high-resolution industrial lens, the rear focusing group is a floating focusing group, and the rear focusing group is used for ensuring the good performance of long-distance and short-distance imaging.
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 satisfy the relation of | y'/f | < 0.74.
The invention has the beneficial effects that: the invention provides a high-resolution industrial lens which comprises an optical module, wherein the optical module is sequentially provided with a front lens group, a diaphragm and a rear focusing group from an object side to an image side; the front lens group includes a first lens having negative power, a second lens having positive power, a third lens having negative power, a fourth lens having negative power, a fifth lens having positive power, and a sixth lens having positive power; the diaphragm is arranged between the front lens group and the rear focusing group; the back focusing group comprises a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power and a twelfth lens with positive focal power; the focal length of the optical module is f, the focal length of the front lens group is fS1, the combined focal length of the rear focusing group is fS2, and the relationship is satisfied: 1.2< | fS1/f | < 2.2; 1< | fS2/f | <2. According to the high-resolution industrial lens, the number of an image space F is 2.8, the high-resolution industrial lens can be matched with a 1.1' inch camera when the focal length is 12mm, the maximum pixel can reach two thousand three million pixels, high-quality imaging is realized, meanwhile, the high-resolution industrial lens adopts a focusing mode of floating focusing, the clear aperture can be flexibly adjusted, and the contradiction between the telecentricity and low distortion of an optical system is effectively balanced.
Drawings
FIG. 1 is a schematic diagram of an optical module according to an embodiment of the present invention;
FIG. 2 is a MTF graph of an optical module according to an embodiment of the present invention.
Wherein:
s1-optical module;
s2-diaphragm;
s3-rear focusing group;
g1 — first lens; g2 — second lens; g3-third lens; g4-fourth lens;
g5-fifth lens; g6-sixth lens; g7-seventh lens; g8-eighth lens;
g9-ninth lens; g10-tenth lens; g11-eleventh lens; g12-twelfth lens;
u1 — first cemented lens; u2 — second cemented lens; u3-third cemented lens.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
As shown in fig. 1-2, the high resolution industrial lens provided by the invention comprises an optical module, wherein the optical module is provided with a front lens group S1, a diaphragm S2 and a rear focusing group S3 in sequence from an object side to an image side; the front lens group S1 includes a first lens G1 having negative power, a second lens G2 having positive power, a third lens G3 having negative power, a fourth lens G4 having negative power, a fifth lens G5 having positive power, and a sixth lens G6 having positive power; a stop S2 is disposed between the front lens group S1 and the rear focus group S3; the back focusing group S3 includes a seventh lens G7 having positive power, an eighth lens G8 having negative power, a ninth lens G9 having positive power, a tenth lens G10 having positive power, an eleventh lens G11 having negative power, and a twelfth lens G12 having positive power;
wherein, the focal length of the optical module is f, the focal length of the front lens group S1 is fS1, the combined focal length of the rear focusing group S3 is fS2, and it satisfies the relation: 1.2< | fS1/f | < 2.2; 1< | fS2/f | <2.
Preferably, the first lens G1 is a meniscus structure, and the focal length of the first lens G1 is fG 1; the second lens G2 is of a biconvex structure, and the focal length of the second lens G2 is fG 2; the third lens G3 is a meniscus structure, and the focal length of the third lens G3 is fG 3; the fourth lens G4 is a biconcave structure, and the focal length of the fourth lens G4 is fG 4; the fifth lens G5 is a biconvex structure, and the focal length of the fifth lens G5 is fG 5; the sixth lens G6 is a meniscus structure, and the focal length of the sixth lens G6 is fG 6; the seventh lens G7 has a biconvex structure, and the focal length of the seventh lens G7 is fG 7; the eighth lens G8 has a biconcave structure, and the focal length of the eighth lens G8 is fG 8; the ninth lens G9 has a biconvex structure, and the focal length of the ninth lens G9 is fG 9; the tenth lens G10 is a meniscus structure, and the focal length of the tenth lens G10 is fG 10; the eleventh lens G11 is a meniscus structure, and the focal length of the eleventh lens G11 is fG 11; the twelfth lens G12 has a biconvex structure, and the focal length of the twelfth lens G12 is fG 12.
The first lens G1, the second lens G2 and the third lens G3 are applicable to a large-field optical system for correcting distortion and reducing the size of the optical system.
Preferably, the fourth lens G4 and the fifth lens G5 constitute a first cemented lens U1, the focal length of the first cemented lens U1 being fU 1; the eighth lens G8 and the ninth lens G9 constitute a second cemented lens U2, the focal length of the second cemented lens U2 being fU 2; the tenth lens G10 and the eleventh lens G11 constitute a third cemented lens U3, and the focal length of the third cemented lens U3 is fU 3.
Preferably, the ratio of the focal length fG1 of the first lens G1, the focal length fG2 of the second lens G2, the focal length fG3 of the third lens G3, the focal length fG6 of the sixth lens G6 to the focal length fS1 of the front lens group S1, respectively, satisfies the relation:
1.7<|fG1/fS1|<2.7；1.4<|fG2/fS1|<2.4；
0.5<|fG3/fS1|<1.2；0.8<|fG6/fS1|<1.8。
preferably, the ratio of the focal length fU1 of the first cemented lens U1 and the focal length fS1 of the front lens group S1 satisfies the relation: 6.2<|fU1/fS1|<8.2。
Preferably, the ratio of the focal length fU2 of the second cemented lens U2 and the focal length fS2 of the rear focusing group S3 satisfies the relation: 0.4< | fU2/fS2| < 1.4.
Preferably, the ratio of the focal length fU3 of the third cemented lens U3 and the focal length fS2 of the rear focusing group S3 satisfies the relation: 2< | fU3/fS2| < 3.
Preferably, the ratio of the focal length fG7 of the seventh lens G7 and the focal length fG12 of the twelfth lens G12 to the focal length fS2 of the rear focusing group S3, respectively, satisfies the relation:
1.35<|fG7/fS2|<2.35；0.6<|fG12/fS2|<1.6。
preferably, the rear focus group S3 is a floating focus group, and the rear focus group S3 is used to ensure the good distance and close distance imaging.
Preferably, the half-image height y 'of the optical module and the focal length f of the optical module satisfy the relation of | y'/f | < 0.74.
In the present embodiment, the optical module data is as follows:
in this example, the focal length of the optical module is 12.25mm, the half-image height y' is 8.8mm, the maximum aperture F is 2.8, and the combined focal length F of the front lens group S1S120.03mm, the combined focal length of the back focusing group S3 is fS321.04mm, focal length f of first lens G1G1Focal length f of second lens G2 of-48.59 mmG241.10mm, focal length f of third lens G3G3Focal length f of the first cemented lens U1 ═ 18.90mmU1159.06mm, focal length f of sixth lens G6G628.89mm, the focal length f of the seventh lens G7G738.62mm, focal length f of the second cemented lens U2U2Focal length f of the third cemented lens U3 ═ 18.50mmU352.46mm, focal length f of twelfth lens G12G12＝23.23mm；
The following relation is satisfied:
(|y’/f|＝0.72)<0.74；
1.2<(|fS1/f|＝1.64)<2.2；1<(|fS2/f|＝1.72)<2；
1.7<(|fG1/fS1|＝2.21)<2.7；1.4<(|fG2/fS1|＝1.87)<2.4；
0.5<(|fG3/fS1|＝0.86)<1.2；6.2<(|fU1/fS1|＝7.22)<8.2；
0.8<(|fG6/fS1|＝1.31)<1.8；1.35<(|fG7/fS2|＝1.84)<2.35；
0.4<(|fU2/fS2|＝0.88)<1.4；2<(|fU3/fS2|＝2.49)<3；
0.6<(|fG12/fS2|＝1.10)<1.6。
fig. 2 is an MTF graph of the optical module of the present embodiment.
According to the high-resolution industrial lens, the number of an image space F is 2.8, the high-resolution industrial lens can be matched with a 1.1' inch camera when the focal length is 12mm, the maximum pixel can reach two thousand three million pixels, high-quality imaging is realized, meanwhile, the high-resolution industrial lens adopts a focusing mode of floating focusing, the clear aperture can be flexibly adjusted, and the contradiction between the telecentricity and low distortion of an optical system is effectively balanced.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A high resolution industrial lens, characterized by: the optical module is sequentially provided with a front lens group (S1), a diaphragm (S2) and a rear focusing group (S3) from an object side to an image side;
the front lens group (S1) includes a first lens (G1) having negative power, a second lens (G2) having positive power, a third lens (G3) having negative power, a fourth lens (G4) having negative power, a fifth lens (G5) having positive power, and a sixth lens (G6) having positive power;
the stop (S2) is disposed between the front lens group (S1) and the rear focusing group (S3);
the rear focusing group (S3) includes a seventh lens (G7) having positive power, an eighth lens (G8) having negative power, a ninth lens (G9) having positive power, a tenth lens (G10) having positive power, an eleventh lens (G11) having negative power, and a twelfth lens (G12) having positive power;
wherein the focal length of the optical module is f, the combined focal length of the front lens group (S1) is fS1, and the combined focal length of the rear focusing group (S3) is fS2, which satisfies the relation: 1.2< | fS1/f | < 2.2; 1< | fS2/f | <2.
2. A high resolution industrial lens according to claim 1, characterized in that:
the first lens (G1) is of a meniscus structure, and the focal length of the first lens (G1) is fG 1;
the second lens (G2) is of a double-convex structure, and the focal length of the second lens (G2) is fG 2;
the third lens (G3) is of a meniscus structure, and the focal length of the third lens (G3) is fG 3;
the fourth lens (G4) is of a biconcave structure, and the focal length of the fourth lens (G4) is fG 4;
the fifth lens (G5) is of a double-convex structure, and the focal length of the fifth lens (G5) is fG 5;
the sixth lens (G6) is of a meniscus structure, and the focal length of the sixth lens (G6) is fG 6;
the seventh lens (G7) is of a biconvex structure, and the focal length of the seventh lens (G7) is fG 7;
the eighth lens (G8) is a biconcave structure, and the focal length of the eighth lens (G8) is fG 8;
the ninth lens (G9) is of a double-convex structure, and the focal length of the ninth lens (G9) is fG 9;
the tenth lens (G10) is of a meniscus structure, and the focal length of the tenth lens (G10) is fG 10;
the eleventh lens (G11) is of a meniscus structure, and the focal length of the eleventh lens (G11) is fG 11;
the twelfth lens (G12) is of a biconvex structure, and the focal length of the twelfth lens (G12) is fG 12.
3. A high resolution industrial lens according to claim 2, characterized in that:
the fourth lens (G4) and the fifth lens (G5) constitute a first cemented lens (U1), the focal length of the first cemented lens (U1) being fU 1;
the eighth lens (G8) and the ninth lens (G9) constitute a second cemented lens (U2), the focal length of the second cemented lens (U2) being fU 2;
the tenth lens (G10) and the eleventh lens (G11) constitute a third cemented lens (U3), the focal length of the third cemented lens (U3) being fU 3.
4. A high resolution industrial lens according to claim 2, characterized in that:
the ratio of the focal length fG1 of the first lens (G1), the focal length fG2 of the second lens (G2), the focal length fG3 of the third lens (G3), the focal length fG6 of the sixth lens (G6) to the focal length fS1 of the front lens group (S1) respectively satisfies the following relation: 1.7< | fG1/fS1| < 2.7; 1.4< | fG2/fS1| < 2.4;
0.5<|fG3/fS1|<1.2；0.8<|fG6/fS1|<1.8。
5. a high resolution industrial lens according to claim 3, characterized in that:
a ratio of a focal length fU1 of the first cemented lens (U1) and a focal length fS1 of the front lens group (S1) satisfies the relation: 6.2< | fU1/fS1| < 8.2.
6. A high resolution industrial lens according to claim 3, characterized in that:
a ratio of a focal length fU2 of the second cemented lens (U2) to a focal length fS2 of the rear focusing group (S3) satisfies the relation: 0.4< | fU2/fS2| < 1.4.
7. A high resolution industrial lens according to claim 3, characterized in that:
a ratio of a focal length fU3 of the third cemented lens (U3) to a focal length fS2 of the rear focusing group (S3) satisfies the relation: 2< | fU3/fS2| < 3.
8. A high resolution industrial lens according to claim 2, characterized in that:
a ratio of a focal length fG7 of the seventh lens (G7) and a focal length fG12 of the twelfth lens (G12) to a focal length fS2 of the rear focus group (S3), respectively, satisfies the relation: 1.35< | fG7/fS2| < 2.35; 0.6< | fG12/fS2| < 1.6.
9. A high resolution industrial lens according to claim 1, characterized in that:
the rear focus group (S3) is a floating focus group, and the rear focus group (S3) is used to ensure the goodness of long-distance and short-distance imaging.
10. A high resolution industrial lens according to claim 1, characterized in that:
the half-image height y 'of the optical module and the focal length f of the optical module satisfy the relational expression of y'/f < 0.74.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488485A (en) * | 2022-02-14 | 2022-05-13 | 合肥埃科光电科技股份有限公司 | Large-target-surface wide-angle low-distortion industrial lens of f22mm |
| WO2023216386A1 (en) * | 2022-05-11 | 2023-11-16 | 广东奥普特科技股份有限公司 | High-resolution wide-angle optical lens and optical device |
-
2020
- 2020-12-30 CN CN202011616497.1A patent/CN112612130A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488485A (en) * | 2022-02-14 | 2022-05-13 | 合肥埃科光电科技股份有限公司 | Large-target-surface wide-angle low-distortion industrial lens of f22mm |
| WO2023216386A1 (en) * | 2022-05-11 | 2023-11-16 | 广东奥普特科技股份有限公司 | High-resolution wide-angle optical lens and optical device |
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