CN209858837U - Low-distortion wide-angle lens - Google Patents
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- CN209858837U CN209858837U CN201920577462.8U CN201920577462U CN209858837U CN 209858837 U CN209858837 U CN 209858837U CN 201920577462 U CN201920577462 U CN 201920577462U CN 209858837 U CN209858837 U CN 209858837U
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Abstract
The utility model belongs to the technical field of lens, in particular to a low distortion wide-angle lens, the optical system of which comprises a front lens group (S1), a middle lens group (S2), a diaphragm (S4) and a focusing group (S3) which are arranged in sequence from the object plane to the image plane (S5) along the optical axis; a focal length of the optical system is f, and a focal length of the front lens group (S1) is f1The focal length of the middle lens group (S2) is f2The focal length of the focusing group (S3) is f3Respectively satisfy the relational expressions: 0.70<|f1/f|<1.60，1.8<|f2/f|<4.0，2.0<|f3/f|<5.0. The utility model has the characteristics of the distortion is low, can effectively reduce the distortion degree of image to adopt the side of focusing of floatingThe formula can meet the imaging requirement of the working distance of more than 100mm and different application requirements, and meanwhile, the clear aperture of the imaging device can be flexibly adjusted.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, concretely relates to low distortion wide-angle camera lens.
Background
Under the background of industrial automation, a machine vision system develops rapidly and is widely applied to the fields of measurement, judgment, defect detection, food packaging, intelligent logistics, medical diagnosis and the like. The lens is used as the core of the machine vision system, and the imaging quality of the lens is a key factor of the success or failure of the machine vision system. The wide-angle lens has a large visual angle and a wide visual field, and can be used for inspecting the packaging state of a high-density printed circuit board, confirming the surface state of a stripe wire and the like on a large-size metal plate, detecting the fine damage of a sheet film, inspecting the pixel loss of a liquid crystal display screen and the like. With the development of the technology, the requirements for the distortion, the resolution and the like of the wide-angle lens are more strict, and the domestic existing wide-angle machine vision lens generally has the defects of different types or different degrees, such as low pixel, large distortion, small field angle and the like, so the research and development of the distortion wide-angle lens are more urgent.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the low-distortion wide-angle lens is provided, has the characteristic of low distortion, has the optical distortion of the full field of view lower than 0.7 percent, and can effectively reduce the distortion degree of the image; and a floating focusing mode is adopted, the distance of the object plane is wide, the imaging requirement and different application requirements of an object with the object plane more than 100mm away from the optical system can be met, and meanwhile, the clear aperture can be flexibly adjusted.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low distortion wide-angle lens whose optical system includes a front lens group S1, a middle lens group S2, a stop S4 and a focus group S3 arranged in this order from an object plane to an image plane S5 along an optical axis;
the front lens group S1 comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with negative focal power and a meniscus structure and a third lens G3 with negative focal power and a meniscus structure which are sequentially arranged from an object plane to an image plane S5 along an optical axis;
the middle lens group S2 comprises a fourth lens G4 with negative focal power and a biconcave structure, a fifth lens G5 with positive focal power and a biconvex structure, a sixth lens G6 with negative focal power and a meniscus structure and a seventh lens G7 with positive focal power and a meniscus structure which are sequentially arranged from the object plane to the image plane S5;
the focusing group S3 comprises an eighth lens G8 with positive focal power and a double convex structure, a ninth lens G9 with negative focal power and a meniscus structure, a tenth lens G10 with negative focal power and a double concave structure, an eleventh lens G11 with positive focal power and a double convex structure, a twelfth lens G12 with positive focal power and a double convex structure and a thirteenth lens G13 with negative focal power and a meniscus structure which are sequentially arranged from the object plane to the image plane S5 along the optical axis;
the focal length of the optical system is f, and the focal length of the front lens group S1 is f1The focal length of the middle lens group S2 is f2The focal length of the focusing group S3 is f3Respectively satisfy the relational expressions: 0.70<|f1/f|<1.60，1.8<|f2/f|<4.0，2.0<|f3/f|<5.0。
As an improvement of a low distortion wide-angle lens, diaphragm S4 is D to image plane S5' S distance, D with the ratio of f satisfies the relational expression: d/f < 4.0.
As an improvement of a low distortion wide-angle lens, optical system's half image height is y ', y ' with the ratio of f satisfies the relational expression: the | y'/f | is less than 1.3.
As an improvement of the low distortion wide-angle lens of the present invention, the refractive index n1 of the first lens G1 satisfies the following relation: 1.7< n1<2.0, the refractive index n2 of the second lens G2 satisfies the relation: 1.7< n2<2.0, the refractive index n3 of the third lens G3 satisfies the relation: 1.7< n3< 2.0.
As an improvement of the low distortion wide-angle lens of the present invention, the fourth lens G4 and the fifth lens G5 form a first cemented lens U1,the focal length of the first cemented lens U1 is fU1Said fU1And f is as described2The ratio of (A) satisfies the relation: 1.5< | fU1/f2|＜3.0。
As an improvement of the low distortion wide-angle lens of the present invention, the sixth lens G6 and the seventh lens G7 form a second cemented lens U2, the focal length of the second cemented lens U2 is fU2Said fU2And f is as described2The ratio of (A) satisfies the relation: 1.5< | fU2/f2|＜3.0。
As an improvement of the low distortion wide-angle lens of the present invention, the eighth lens G8 and the ninth lens G9 form a third cemented lens U3, the focal length of the third cemented lens U3 is fU3Said fU3And f is as described3The ratio of (A) satisfies the relation: 0.5 < | fU3/f3|＜1.0。
As an improvement of the low distortion wide-angle lens of the present invention, the refractive index n10 of the tenth lens G10 and the refractive index n13 of the thirteenth lens G13 satisfy the following relation: 1.75< n10<2.1, 1.75< n13< 2.1.
As an improvement of the low distortion wide-angle lens of the present invention, the refractive index n11 of the eleventh lens G11 and the refractive index n12 of the twelfth lens G12 satisfy the following relation: 1.5< n11<1.8, 1.5< n12< 1.8.
As an improvement of the low distortion wide-angle lens of the present invention, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9, the tenth lens G10, the eleventh lens G11, the twelfth lens G12, and the thirteenth lens G13 are all spherical mirrors.
The beneficial effects of the utility model reside in that, the optical system of camera lens includes along the preceding battery of lenses S1 that the optical axis arranged in proper order from the object plane to image plane S5, well battery of lenses S2, diaphragm S4 and focusing group S3, preceding battery of lenses S1' S focusf1Focal length f of middle lens group S22Focal length f of focusing group S33Respectively satisfy the following relation with the focal length f of the optical system: 0.70<|f1/f|<1.60，1.8<|f2/f|<4.0，2.0<|f3/f|<5.0, the optical structure can realize the technical effect of low distortion of the machine vision lens, and the optical distortion of the whole visual field of the optical system is lower than 0.7%; moreover, the optical structure enables the working distance of the optical system to be wide, adopts a floating focusing mode, can reach the corresponding imaging requirement from 100mm to infinity, and can meet the application requirements of different scenes; in the optical structure, the first lens G1, the second lens G2 and the third lens G3 of the front lens group S1 are all meniscus structures, and the incidence angles of principal rays on the optical surfaces of the first lens G1, the second lens G2 and the third lens G3 can be effectively reduced by adopting a positive-negative focal power distribution mode, so that off-axis aberration can be corrected and distortion can be reduced; the diaphragm S4 is positioned between the middle lens group S2 and the focusing group S3, and enough air space is left in front of and behind the diaphragm S4, so that the clear aperture of the optical system can be flexibly adjusted.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a graph of optical distortion curves according to the present invention.
Among them, 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, G13-thirteenth lens, U1-first cemented lens, U2-second cemented lens, U3-third cemented lens, S1-front lens group, S2-middle lens group, S3-focusing group, S4-diaphragm, S5-image plane.
Detailed Description
As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element 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 otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
As shown in fig. 1, a low distortion wide-angle lens whose optical system includes a front lens group S1, a middle lens group S2, a stop S4, and a focus group S3 arranged in this order from an object plane to an image plane S5 along an optical axis;
the front lens group S1 comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with negative focal power and a meniscus structure and a third lens G3 with negative focal power and a meniscus structure which are sequentially arranged from an object plane to an image plane S5 along an optical axis, and a positive-negative focal power distribution mode effectively reduces the incidence angle of a chief ray on each optical surface of the first lens G1, the second lens G2 and the third lens G3, is beneficial to correcting off-axis aberration and reducing distortion;
the middle lens group S2 comprises a fourth lens G4 with negative focal power and a biconcave structure, a fifth lens G5 with positive focal power and a biconvex structure, a sixth lens G6 with negative focal power and a meniscus structure and a seventh lens G7 with positive focal power and a meniscus structure which are sequentially arranged from the object plane to the image plane S5;
the focusing group S3 comprises an eighth lens G8 with positive focal power and a double convex structure, a ninth lens G9 with negative focal power and a meniscus structure, a tenth lens G10 with negative focal power and a double concave structure, an eleventh lens G11 with positive focal power and a double convex structure, a twelfth lens G12 with positive focal power and a double convex structure and a thirteenth lens G13 with negative focal power and a meniscus structure which are sequentially arranged from the object plane to the image plane S5 along the optical axis;
the focal length of the optical system is f, and the focal length of the front lens group S1 is f1The focal length of the middle lens group S2 is f2The focal length of the focusing group S3 is f3Respectively satisfy the relational expressions: 0.70<|f1/f|<1.60，1.8<|f2/f|<4.0，2.0<|f3/f|<5.0, the above relation enables the optical system to achieve the technical effect of low distortion, and the focal length of the front lens group S1, the focal length of the middle lens group S2 and the focal length of the focusing group S3 are sequentially increased in the direction from the object plane to the image plane S5 along the optical axis, so that the optical system can reach the corresponding imaging requirements from 100mm to infinity.
Preferably, in order to make the clear aperture of the optical system flexibly adjustable, the distance from the diaphragm S4 to the image plane S5 is D, and the ratio of D to f satisfies the relation: d/f < 4.0.
Preferably, in order to better adjust the imaging range of the optical system, the half-image height of the optical system is y ', and the ratio of y' to f satisfies the relation: the | y'/f | is less than 1.3.
Preferably, in order to improve the refraction effect of the light after entering the lens, the refractive index n1 of the first lens G1 satisfies the relation: 1.7< n1<2.0, the refractive index n2 of the second lens G2 satisfies the relation: 1.7< n2<2.0, the refractive index n3 of the third lens G3 satisfies the relation: 1.7< n3< 2.0.
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 fU1Said fU1And f is as described2The ratio of (A) satisfies the relation: 1.5< | fU1/f2|＜3.0。
Preferably, the sixth lens G6 and the seventh lens G7 constitute a second cemented lens U2, the focal length of the second cemented lens U2 being fU2Said fU2And f is as described2The ratio of (A) satisfies the relation: 1.5< | fU2/f2|＜3.0。
Preferably, the eighth lens G8 and the ninth lens G9 constitute a third cemented lens U3, the third cemented lens U3 having a focal length fU3Said fU3And f is as described3The ratio of (A) satisfies the relation: 0.5 < | fU3/f3|＜1.0。
Preferably, the refractive index n10 of the tenth lens G10 and the refractive index n13 of the thirteenth lens G13 satisfy the relation: 1.75< n10<2.1, 1.75< n13< 2.1.
Preferably, the refractive index n11 of the eleventh lens G11 and the refractive index n12 of the twelfth lens G12 satisfy the relation: 1.5< n11<1.8, 1.5< n12< 1.8.
Preferably, for convenience of lens manufacture, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9, the tenth lens G10, the eleventh lens G11, the twelfth lens G12, and the thirteenth lens G13 are all spherical mirrors.
Specific optical system data are as follows:
in the embodiment, the focal length F of the optical system is 8.5mm, the maximum aperture is F # -2.4, and the focal length F of the front lens group S1110.11mm, the focal length f of the middle lens group S22Focal length f of focusing group S3 being 17.20mm323.06mm, focal length f of the first cemented lens U1U132.10mm, focal length f of the second cemented lens U2U236.35mm, focal length f of the third cemented lens U3U319.01mm, the distance D between the diaphragm S4 and the image plane S5 is 32.68mm, and the half-image height y' is 8.8 mm.
Each relation: l f1/f|＝1.19；|f2/f|＝2.02；|f3/f|＝2.71；
|D/f|＝3.85；|y’/f|＝1.03；|fU1/f2|＝1.87；|fU2/f2|＝2.11；
|fU3/f3|＝0.82。
Satisfy the relation: 0.70<|f1/f|<1.60；1.8<|f2/f|<4.0；2.0<|f3/f|<5.0；
|D/f|＜4.0；|y’/f|＜1.3；1.5＜|fU1/f2|、|fU2/f2|＜3.0；
0.5＜|fU3/f3|＜1.0。
Fig. 2 shows a graph of optical distortion, with a maximum optical distortion of less than 1.0% over the full field of view, and with an average optical distortion of less than 0.7% over the full field of view.
The optical structure can meet the imaging requirement of 100mm to infinity, can meet the application requirements of different scenes, and can flexibly adjust the clear aperture.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to 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 low distortion wide-angle lens characterized in that: the optical system of the lens comprises a front lens group (S1), a middle lens group (S2), a diaphragm (S4) and a focusing group (S3) which are sequentially arranged from an object plane to an image plane (S5) along an optical axis;
the front lens group (S1) comprises a first lens (G1) with positive focal power and a meniscus structure, a second lens (G2) with negative focal power and a meniscus structure and a third lens (G3) with negative focal power and a meniscus structure which are sequentially arranged from an object plane to an image plane (S5) along an optical axis;
the middle lens group (S2) comprises a fourth lens (G4) with negative focal power and a double-concave structure, a fifth lens (G5) with positive focal power and a double-convex structure, a sixth lens (G6) with negative focal power and a meniscus structure and a seventh lens (G7) with positive focal power and a meniscus structure which are sequentially arranged from an object plane to an image plane (S5);
the focusing group (S3) comprises an eighth lens (G8) with positive focal power and a double convex structure, a ninth lens (G9) with negative focal power and a meniscus structure, a tenth lens (G10) with negative focal power and a double concave structure, an eleventh lens (G11) with positive focal power and a double convex structure, a twelfth lens (G12) with positive focal power and a double convex structure and a thirteenth lens (G13) with negative focal power and a meniscus structure which are sequentially arranged from the object plane to the image plane (S5);
a focal length of the optical system is f, and a focal length of the front lens group (S1) is f1The focal length of the middle lens group (S2) is f2The focal length of the focusing group (S3) is f3Respectively satisfy the relational expressions: 0.70<|f1/f|<1.60，1.8<|f2/f|<4.0，2.0<|f3/f|<5.0。
2. A low distortion wide-angle lens as claimed in claim 1, wherein: the distance from the diaphragm (S4) to the image plane (S5) is D, and the ratio of D to f satisfies the relation: d/f < 4.0.
3. A low distortion wide-angle lens as claimed in claim 1, wherein: the half image height of the optical system is y ', and the ratio of y' to f satisfies the relation: the | y'/f | is less than 1.3.
4. A low distortion wide-angle lens as claimed in claim 1, wherein: the refractive index n1 of the first lens (G1) satisfies the relation: 1.7< n1<2.0, the refractive index n2 of the second lens (G2) satisfying the relation: 1.7< n2<2.0, the refractive index n3 of the third lens (G3) satisfying the relation: 1.7< n3< 2.0.
5. A low distortion wide-angle lens as claimed in claim 1, wherein: 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 fU1Said fU1And f is as described2The ratio of (A) satisfies the relation: 1.5< | fU1/f2|＜3.0。
6. A low distortion wide-angle lens as claimed in claim 1, wherein: the sixth lens (G6) and the seventh lens (G7) constitute a second cemented lens (U2), the focal length of the second cemented lens (U2) being fU2Said fU2And f is as described2The ratio of (A) satisfies the relation: 1.5< | fU2/f2|＜3.0。
7. A low distortion wide-angle lens as claimed in claim 1, wherein: the eighth lens (G8) and the ninth lens (G9) constitute a third cemented lens (U3), the focal length of the third cemented lens (U3) being fU3Said fU3And f is as described3The ratio of (A) satisfies the relation: 0.5 < | fU3/f3|＜1.0。
8. A low distortion wide-angle lens as claimed in claim 1, wherein: a refractive index n10 of the tenth lens (G10) and a refractive index n13 of the thirteenth lens (G13) satisfy the relation: 1.75< n10<2.1, 1.75< n13< 2.1.
9. A low distortion wide-angle lens as claimed in claim 1, wherein: a refractive index n11 of the eleventh lens (G11) and a refractive index n12 of the twelfth lens (G12) satisfy the relation: 1.5< n11<1.8, 1.5< n12< 1.8.
10. A low distortion wide-angle lens as claimed in claim 1, wherein: the first lens (G1), the second lens (G2), the third lens (G3), the fourth lens (G4), the fifth lens (G5), the sixth lens (G6), the seventh lens (G7), the eighth lens (G8), the ninth lens (G9), the tenth lens (G10), the eleventh lens (G11), the twelfth lens (G12), and the thirteenth lens (G13) are all spherical mirrors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920577462.8U CN209858837U (en) | 2019-04-25 | 2019-04-25 | Low-distortion wide-angle lens |
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| CN201920577462.8U CN209858837U (en) | 2019-04-25 | 2019-04-25 | Low-distortion wide-angle lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058390A (en) * | 2019-04-25 | 2019-07-26 | 奥普特视觉科技(苏州)有限公司 | A kind of low distortion wide-angle lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058390A (en) * | 2019-04-25 | 2019-07-26 | 奥普特视觉科技(苏州)有限公司 | A kind of low distortion wide-angle lens |
| CN110058390B (en) * | 2019-04-25 | 2024-02-13 | 奥普特视觉科技(苏州)有限公司 | Low-distortion wide-angle lens |
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