CN210181286U - Large-view-field machine vision lens - Google Patents
Large-view-field machine vision lens Download PDFInfo
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- CN210181286U CN210181286U CN201920519970.0U CN201920519970U CN210181286U CN 210181286 U CN210181286 U CN 210181286U CN 201920519970 U CN201920519970 U CN 201920519970U CN 210181286 U CN210181286 U CN 210181286U
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Abstract
The utility model belongs to the technical field of the camera lens, concretely relates to optical system of big visual field machine vision camera lens, include and set gradually first battery of lens S1, diaphragm, second battery of lens S2, third battery of lens S3 to the image space by the object space, optical system 'S focus f, first battery of lens S1' S focus f1Focal length f of the second lens group S22Focal length f of the third lens group S33Respectively satisfy the relational expressions: 1<|f1/f|<1.4；1.90<|f2/f|<2.35；4.4<|f3/f|<5.6. The utility modelThe optical system realizes the high-pixel large-view-field machine vision lens with the focal length of 25mm, and the maximum imaging surface is
The field angle is more than 80 degrees, and the image element size can be matched with the image element size of 5 mu m.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, concretely relates to big visual field machine vision camera lens.
Background
Under the background of industrial automation, a machine vision system plays an extremely important role, and mainly has the main functions of automatically measuring, judging, detecting defects and the like of a target part by using a machine, reducing or eliminating misjudgment during manual operation and improving the measurement precision and stability. The machine vision lens is used as a core component of a vision system, and the imaging quality of the machine vision lens is a key factor for the success or failure of the machine vision system. The demand of machine vision is increasing day by day, especially in the industries of electronic manufacturing, liquid crystal display defect detection, measurement of mobile phone touch screen lines, dimensions and the like, food packaging and the like, the requirement on a machine vision lens is higher and higher, and the machine vision lens is expected to support the characteristics of large target surface, large visual field, high pixels and the like.
At present, in the machine vision lens on the market, as disclosed in the patent with publication number "CN 107577032A", the distortion rate of the lens is 20%, the optical distortion is large, and the distortion degree is high; as disclosed in patent publication No. CN108319004A, the lens distortion rate is controlled at 5%, and the optical distortion is large; the processing cost of the lens containing the aspheric surface is high, and the requirements of the existing market cannot be met; as disclosed in patent publication No. CN108490583A, the lens has a small target surface and an aspheric structure, which increases the processing cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the large-visual-field machine vision lens which has a large target surface and high pixels and can be matched with the pixel size of 5 mu m is provided, and the industrial development requirement is met.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a large-visual-field machine vision lens comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system is provided with a first lens group S1, a diaphragm, a second lens group S2 and a third lens group S3 in sequence from an object side to an image side, the third lens group S3 is fixedly arranged, the first lens group S1, the diaphragm and the second lens group S2 are movably arranged, and when the working distance is changed, the first lens group S1, the diaphragm and the second lens group S2 are focused in a back-and-forth movement mode;
the first lens group S1 comprises a first lens G1 with negative focal power and a meniscus structure, a second lens G2 with negative focal power and a biconcave structure, a third lens G3 with positive focal power and a biconvex structure, a fourth lens G4 with negative focal power and a meniscus structure, a fifth lens G5 with negative focal power and a meniscus structure, and a sixth lens G6 with positive focal power and a biconvex structure;
the second lens group S2 includes a seventh lens G7 having positive power and a biconvex structure, an eighth lens G8 having negative power and a biconcave structure, and a ninth lens G9 having positive power and a biconvex structure;
the third lens group S3 includes a tenth lens G10 having a negative power and a meniscus structure, an eleventh lens G11 having a negative power and a meniscus structure, a twelfth lens G12 having a positive power and a double convex structure;
a focal length f of the optical system, a focal length f of the first lens group S11Focal length f of the second lens group S22Focal length f of the third lens group S33Respectively satisfy the relational expressions: 1<|f1/f|<1.4；1.90<|f2/f|<2.35；4.4<|f3/f|<5.6。
As the utility model discloses an improvement of big visual field machine vision camera lens, optical system's twelfth lens G12 to image plane's distance promptly behind the optics intercept BFL with optical system's focus f satisfies the relational expression: i BFL/f I is less than 1.5.
As the improvement of big visual field machine vision camera lens, optical system's half high y ' of image with optical system's focus f satisfies the relational expression: the | y'/f | is less than 0.95.
As an improvement of the large field of view machine vision lens of the present invention, the refractive index of the first lens G1 is n1, and the refractive index n1 satisfies the following relation: n1 is more than 1.75 and less than 2.1.
As an improvement of the large field of view machine vision lens of the present invention, the third lens G3 and the fourth lens G4 form a first cemented lens U1, the fifth lens G5 and the sixth lens G6 form a second cemented lens U2, the focal length of the first cemented lens U1 is fU1Focal length f of the second cemented lens U2U2Focal length f thereofU1And f1The ratio of (A) satisfies the relation: 8 < | fU1/f1|＜13；fU2And f1Satisfies the relation 0.7 < | fU2/f1|＜1.0。
As an improvement of the large field of view machine vision lens of the present invention, the seventh lens G7 and the eighth lens G8 form a third cemented lens U3, the focal length of the third cemented lens U3 is fU3，fU3And f2The ratio of (A) satisfies the relation: 0.7 < | fU3/f2|＜1.0。
As an improvement of the large visual field machine vision lens of the present invention, the refractive index of the ninth lens G9 is n9, and the refractive index n9 satisfies the following relation: n9 is more than 1.75 and less than 2.1.
As an improvement of the large field of view machine vision lens of the present invention, the refractive index of the tenth lens G10 is n10, and its refractive index n10 satisfies the following relation: n10 is more than 1.6 and less than 1.75.
As an improvement of the large field of view machine vision lens of the present invention, the eleventh lens G11 and the twelfth lens G12 form a fourth cemented lens U4, and the focal length of the fourth cemented lens U4 is fU4，fU4And f3The ratio of (A) satisfies the relation: 0.9 < | fU4/f3|＜1.3。
As improvement of big visual field machine vision camera lens, each lens be the spherical mirror, the spherical mirror is all adopted to lens, can reduce the processing cost.
The beneficial effects of the utility model reside in that: the optical system of the high-pixel large-view-field machine vision lens with the focal length of 25mm is realized through the structure, and the maximum imaging surface is
The field angle is more than 80 degrees, the resolution can reach 90lp/mm, and when the full-frame camera is matched, the pixels can reach 2900 ten thousand pixels. The full field optical distortion is lower than 2.3%; the floating focusing mode is adopted, different application requirements can be met, and the clear aperture can be flexibly adjusted; the lenses are all spherical mirrors, so that the processing cost is reduced.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided to explain the invention and not to constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a schematic representation of a lens optical system of an embodiment;
FIG. 2 is a light path diagram of a lens optical system of an embodiment;
FIG. 3 is a diagram illustrating a transfer function of an exemplary lens system;
FIG. 4 is a graph of optical distortion of a lens optical system of an embodiment;
in the figure: 1-a diaphragm; 2-an image plane; 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; u4-fourth cemented lens; s1 — first lens group; s2 — second lens group; s3-third lens group.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers 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, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
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," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, 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. 1-2, a large-field-of-view machine vision lens includes a mechanical system and an optical system installed inside the mechanical system, the optical system includes a first lens group S1, a stop 1, a second lens group S2, and a third lens group S3 sequentially from an object side to an image side, the third lens group S3 is fixedly disposed, the first lens group S1, the stop 1, and the second lens group S2 are movably disposed, and when a working distance changes, the first lens group S1, the stop 1, and the second lens group S2 are focused in a forward and backward movement manner;
the first lens group S1 includes a first lens G1 having a negative focal power and a meniscus structure, a second lens G2 having a negative focal power and a biconcave structure, a third lens G3 having a positive focal power and a biconvex structure, a fourth lens G4 having a negative focal power and a meniscus structure, a fifth lens G5 having a negative focal power and a meniscus structure, and a sixth lens G6 having a positive focal power and a biconvex structure;
the second lens group S2 includes a seventh lens G7 having positive power and a biconvex structure, an eighth lens G8 having negative power and a biconcave structure, and a ninth lens G9 having positive power and a biconvex structure;
the third lens group S3 includes a tenth lens G10 having a negative power and a meniscus structure, an eleventh lens G11 having a negative power and a meniscus structure, a twelfth lens G12 having a positive power and a double convex structure;
focal length f of the optical system, focal length f of the first lens group S11Focal length f of the second lens group S22Focal length f of the third lens group S33Respectively satisfy the relational expressions: 1<|f1/f|<1.4；1.90<|f2/f|<2.35；4.4<|f3/f|<5.6。
Preferably, the distance between the twelfth lens G12 of the optical system and the image plane 2, i.e. the optical back intercept BFL, and the focal length f of the optical system satisfy the following relation: i BFL/f I is less than 1.5.
Preferably, the half-image height y' of the optical system and the focal length f of the optical system satisfy the relation: the | y'/f | is less than 0.95.
Preferably, the refractive index of the first lens G1 is n1, and the refractive index n1 satisfies the relation: n1 is more than 1.75 and less than 2.1.
Preferably, the third lens G3 and the fourth lens G4 form a first cemented lens U1, the fifth lens G5 and the sixth lens G6 form a second cemented lens U2, and the first cemented lens U1 has a focal length fU1Focal length f of the second cemented lens U2U2，fU1And f1The ratio of (A) satisfies the relation: 8 < | fU1/f1|＜13；fU2And f1The ratio of (A) satisfies the relation: 0.7 < | fU2/f1|＜1.0。
Preferably, the seventh lens G7 and the eighth lens G8 form a third cemented lens U3, and the focal length f of the third cemented lens U3U3，fU3And f2The ratio of (A) satisfies the relation: 0.7 < | fU3/f2|＜1.0。
Preferably, the refractive index of the ninth lens G9 is n9, and the refractive index n9 satisfies the relation: n9 is more than 1.75 and less than 2.1.
Preferably, the tenth lens G10 has a refractive index n10, and the refractive index n10 satisfies the relationship: n10 is more than 1.6 and less than 1.75.
Preferably, the eleventh lens G11 and the twelfth lens G12 form a fourth cemented lens U4, and the focal length f of the fourth cemented lens U4U4，fU4And f3The ratio of (A) satisfies the relation: 0.9 < | fU4/f3|＜1.3。
Preferably, each lens is a spherical mirror.
Example (b):
specific optical system data are as follows:
in the embodiment, the focal length F of the optical system is 25mm, the maximum aperture is F # -2.8, and the focal length F of the first lens group130.01mm, focal length f of the second lens group2Focal length f of the third lens group, 53.17mm3-125.22mm, focal length f of the first cemented lens groupU1352.76mm, focal length f of the second cemented lens groupU2Focal length f of the third cemented lens group, 26.91mmU3-42.89mm, focal length f of the fourth cemented lens groupU4122.86mm, optical back intercept BFL 26.411mm, and half-image height y' 22 m.
Each relation: l f1/f|＝1.20；|f2/f|＝2.13；|f3/f|＝5.01；
|BFL/f|＝1.06；|y’/f|＝0.88；|fU1/f1|＝11.75；|fU2/f1|＝0.90；
|fU3/f2|＝0.81；|fU4/f3|＝0.98。
Satisfy the relation: 1<|f1/f|<1.4；1.90<|f2/f|<2.35；4.4<|f3/f|<5.6；|BFL/f|＜1.5；|y’/f|＜0.95；8＜|fU1/f1|＜13；
0.7＜|fU2/f1|＜1.0；0.7＜|fU3/f2|＜1.0；0.9＜|fU4/f3|＜1.3。
FIG. 3 is a MTF graph of the embodiment, the MTF value of the full field at 90lp/mm is >0.25, the theoretical resolution precision can reach 5 microns, and high-resolution imaging of the optical system is realized.
FIG. 4 is a graph showing the optical distortion of the embodiment, wherein the maximum optical distortion is less than 2.3% in the full field of view.
The optical system of the high-pixel large-view-field fixed-focus machine vision lens with the focal length of 25mm is realized through the structure, and the maximum imaging surface is
The field angle is more than 80 degrees, the resolution can reach 90lp/mm, and when the full-frame camera is matched, the pixels can reach 2900 ten thousand pixels. The full field optical distortion is lower than 2.3%; the floating focusing mode is adopted, different application requirements can be met, meanwhile, the clear aperture can be flexibly adjusted, and the lenses are spherical mirrors, so that the processing cost can be reduced.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (9)
1. A large field of view machine vision lens, characterized by: the optical system is arranged in the mechanical system, the optical system is provided with a first lens group S1, a diaphragm (1), a second lens group S2 and a third lens group S3 from an object side to an image side in sequence, the third lens group S3 is fixedly arranged, the first lens group S1, the diaphragm (1) and the second lens group S2 are movably arranged, and when the working distance is changed, the first lens group S1, the diaphragm (1) and the second lens group S2 are focused in a front-and-back movement mode;
the first lens group S1 comprises a first lens G1 with negative focal power and a meniscus structure, a second lens G2 with negative focal power and a biconcave structure, a third lens G3 with positive focal power and a biconvex structure, a fourth lens G4 with negative focal power and a meniscus structure, a fifth lens G5 with negative focal power and a meniscus structure, and a sixth lens G6 with positive focal power and a biconvex structure;
the second lens group S2 includes a seventh lens G7 having positive power and a biconvex structure, an eighth lens G8 having negative power and a biconcave structure, and a ninth lens G9 having positive power and a biconvex structure;
the third lens group S3 includes a tenth lens G10 having a negative power and a meniscus structure, an eleventh lens G11 having a negative power and a meniscus structure, a twelfth lens G12 having a positive power and a double convex structure;
a focal length f of the optical system, a focal length f of the first lens group S11Focal length f of the second lens group S22Focal length f of the third lens group S33Respectively satisfy the relational expressions: 1<|f1/f|<1.4； 1.90<|f2/f|<2.35； 4.4<|f3/f|<5.6；
The seventh lens G7 and the eighth lens G8 form a third cemented lens U3, the third cemented lens U3 having a focal length fU3，fU3And f2The ratio of (A) satisfies the relation: 0.7＜| fU3/ f2|＜1.0。
2. The large-field-of-view machine-vision lens of claim 1, wherein: the distance between the twelfth lens G12 of the optical system and the image plane (2), namely the optical back intercept BFL, and the focal length f of the optical system satisfy the relation: i BFL/f I is less than 1.5.
3. The large-field-of-view machine-vision lens of claim 1, wherein: the half-image height y' of the optical system and the focal length f of the optical system satisfy the relation: the | y'/f | is less than 0.95.
4. The large-field-of-view machine-vision lens of claim 1, wherein: the refractive index of the first lens G1 is n1, and n1 is more than 1.75 and less than 2.1.
5. The large-field-of-view machine-vision lens of claim 1, wherein: the third lens G3 and the fourth lens G4 form a first cemented lens U1, the fifth lens G5 and the sixth lens G6 form a second cemented lens U2, and the focal length of the first cemented lens U1 is fU1Focal length f of the second cemented lens U2U2，fU1And f1The ratio of (A) satisfies the relation: 8 < | fU1/ f1|＜13；fU2And f1The ratio of (A) satisfies the relation: 0.7 < | fU2/ f1|＜1.0 。
6. The large-field-of-view machine-vision lens of claim 1, wherein: the refractive index of the ninth lens G9 is n9, and n9 is more than 1.75 and less than 2.1.
7. The large-field-of-view machine-vision lens of claim 1, wherein: the refractive index of the tenth lens G10 is n10, 1.6 < n10 < 1.75.
8. The hyperopia of claim 1A field machine vision lens, characterized by: the eleventh lens G11 and the twelfth lens G12 constitute a fourth cemented lens U4, the focal length of the fourth cemented lens U4 being fU4，fU4And f3The ratio of (A) satisfies the relation: 0.9 < | fU4/ f3|＜1.3。
9. The large-field-of-view machine-vision lens of claim 1, wherein: each lens is a spherical mirror.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022048650A1 (en) * | 2020-09-04 | 2022-03-10 | 深圳市道通智能航空技术股份有限公司 | Photographing camera and unmanned aerial vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022048650A1 (en) * | 2020-09-04 | 2022-03-10 | 深圳市道通智能航空技术股份有限公司 | Photographing camera and unmanned aerial vehicle |
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