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CN111190272A - High-resolution large-aperture lens - Google Patents

High-resolution large-aperture lens Download PDF

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Publication number
CN111190272A
CN111190272A CN202010151171.XA CN202010151171A CN111190272A CN 111190272 A CN111190272 A CN 111190272A CN 202010151171 A CN202010151171 A CN 202010151171A CN 111190272 A CN111190272 A CN 111190272A
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lens
focal length
group
optical module
aperture
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CN111190272B (en
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曾振煌
林佳敏
卢盛林
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Guangdong OPT Machine Vision Co Ltd
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Guangdong OPT Machine Vision Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • 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
    • G02B15/163—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • 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

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention belongs to the technical field of lenses, and particularly relates to a high-resolution large-aperture lens which comprises a mechanical device and an optical module arranged in the mechanical device, wherein the optical module is provided with a fixed group S1 and a focusing group S2 in sequence from an object space to an image space, the focal length f of the optical module is f, and the focal length of the fixed group S1 is f1Focal length f of said focus group S22，f1The ratio of f to f satisfies the relation: 0.90 < | f1/f|＜1.60；f2The ratio of f to f satisfies the relation: 2.0 < | f2The/| is less than 5.0. The optical module of the high-resolution large-aperture lens is realized through the structure, the maximum aperture reaches F1.4, and the resolution of pixels can reach 1000 ten thousand levels; the working distance is wide, a floating focusing mode is adopted, the corresponding imaging requirements can be met from 200mm to infinity, and the clear aperture can be flexibly adjusted.

Description

High-resolution large-aperture lens
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a high-resolution large-aperture lens.
Background
Under the background of industrial automation, the industrial lens is widely applied to the fields of machine vision detection such as measurement, judgment and defect detection, food packaging, intelligent logistics, medical diagnosis and the like. The requirements of the application occasions on the performance of the lens are not different, for example, the size measurement application requires the distortion of the lens to be lower; fine defect detection applications require higher resolution of the lens; the online detection application can improve the detection speed by using the line scanning lens; detection in dark fields or environments with dark ambient light requires a larger lens aperture, and so on. However, the resolution of the domestic conventional industrial lens is low although the industrial lens has a large aperture, or the resolution is high but the aperture is small, so the research and development of the high-resolution large-aperture lens are more urgent.
At present, in a machine vision lens on the market, as in patent No. 201720684137.2, the maximum aperture of the lens is F2.2, but the resolution of the lens is only mega pixels, and the resolution cannot meet the requirement of the prior art.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the optical module of the high-resolution large-aperture lens is developed, can be applied to measurement and detection items under the condition of a darker environment, and meets different industrial development requirements.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-resolution large-aperture lens comprises a mechanical device and an optical module arranged in the mechanical device, wherein the optical module is provided with a fixed group S1 and a focusing group S2 in sequence from an object side to an image side;
the fixed group S1 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 positive focal power and a double convex structure, a fourth lens G4 with negative focal power and a double concave structure, a fifth lens G5 with negative focal power and a double concave structure, a sixth lens G6 with positive focal power and a double convex structure, and a seventh lens G7 with positive focal power and a double convex structure; a diaphragm is arranged between the fourth lens G4 and the fifth lens G5; the fixed group S1 is of a double-Gaussian structure, the diaphragm is arranged between the two cemented lenses, and the structural mode can better correct the vertical axis aberration and is beneficial to improving the optical index performance of the lens.
The focusing group S2 includes an eighth lens G8 having negative optical power and a ninth lens G9 having positive optical power; the fine adjustment of the focusing group can well balance the aberration caused by the object distance, and the imaging with wide working distance is realized.
The focal length f of the optical module is f, and the focal length of the fixed group S1 is f1Focal length f of said focus group S22，f1The ratio of f to f satisfies the relation: 0.90 < | f1/f|＜1.60；f2The ratio of f to f satisfies the relation: 2.0 < | f2/f|＜5.0。
As an improvement of the high resolution large aperture lens, a distance L from a vertex of the first lens G1 close to the object side surface to the image plane and a focal length f of the optical module satisfy a relation: l/f < 2.0.
As an improvement of the high-resolution large-aperture lens, the half-image height y' of the optical module and the focal length f of the optical module satisfy the following relation: the | y'/f | is less than 0.4.
As an improvement of the high-resolution large-aperture lens, the refractive index of the first lens G1 is n1, the refractive index of the second lens G2 is n2, the refractive index n1 and the refractive index n2 simultaneously satisfy the relational expression, wherein n1 is greater than or equal to 1.6, and n2 is less than or equal to 1.9.
As an improvement of the high resolution large aperture lens of the present invention, the third lens G3 and the fourth lens G4 form a first cemented lens group U1, the fifth lens G5 and the sixth lens G6 form a second cemented lens group U2, and the focal length of the first cemented lens group U1 is fu1The focal length of the second cemented lens group U2 is fu2，fu1The ratio of f to f satisfies the relation: 0.3 < | fu1/f|＜1.0，fu2The ratio of f to f satisfies the relation: 20 < | fu2/f|＜30。
As an improvement of the high-resolution large-aperture lens, the refractive index of the seventh lens G7 is n7, and n7 is more than or equal to 1.8 and less than or equal to 2.0.
As an improvement of the high resolution large aperture lens of the present invention, the eighth lens G8 and the ninth lens G9 form a third cemented lens group U3, and the focal length of the eighth lens G8 is fG8The focal length of the ninth lens G9 is fG9，fG8And fG9The ratio of (A) satisfies the relation: 1.0 < | fG8/fG9|＜2.0。
As an improvement of the high-resolution large-aperture lens, each lens is a spherical mirror.
The invention has the beneficial effects that: the optical module of the high-resolution large-aperture lens is realized through the structure, the maximum aperture reaches F1.4, and the resolution of pixels can reach 1000 ten thousand levels; the working distance is wide, a floating focusing mode is adopted, corresponding imaging requirements can be met from 200mm to infinity, different application requirements can be met, and meanwhile the clear aperture can be flexibly adjusted.
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 not to limit the invention. In the drawings:
fig. 1 is a schematic view of a lens optical module according to a first embodiment;
FIG. 2 is a schematic view of a lens optical module according to a second embodiment;
in the figure: 1-diaphragm, 2-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 and U1-first cemented lens group; u2-second cemented lens group, U3-third cemented lens group, S1-fixed group, S2-focusing 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 those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, 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, 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example one
As shown in fig. 1, the present embodiment provides a high resolution large aperture lens, which includes a mechanical device and an optical module installed inside the mechanical device, wherein the optical module is sequentially provided with a fixed group S1 and a focusing group S2 from an object side to an image side;
the fixed group S1 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 positive focal power and a double convex structure, a fourth lens G4 with negative focal power and a double concave structure, a fifth lens G5 with negative focal power and a double concave structure, a sixth lens G6 with positive focal power and a double convex structure, and a seventh lens G7 with positive focal power and a double convex structure; a diaphragm 1 is arranged between the fourth lens G4 and the fifth lens G5; the fixed group is of a double-Gaussian-like structure, the diaphragm 1 is placed between the two cemented lenses, and the structure mode can better correct the vertical axis aberration and is beneficial to improving the optical index performance of the lens.
The focusing group S2 includes an eighth lens G8 having negative optical power and a ninth lens G9 having positive optical power; the fine adjustment of the focusing group S2 can well balance the aberration caused by the object distance, and realize the imaging with wide working distance.
The focal length f of the optical module and the focal length f of the fixed set S11Focal length f of focusing group S22，f1The ratio of f to f satisfies the relation: 0.90 < | f1/f|＜1.60；f2The ratio of f to f satisfies the relation: 2.0 < | f2/f|＜5.0。
Further, the distance L from the vertex of the first lens G1 close to the object side surface to the image plane 2 and the focal length f of the optical module satisfy the following relation: l/f < 2.0.
Further, the half-image height y' of the optical module and the focal length f of the optical module satisfy the relation: the | y'/f | is less than 0.4.
Furthermore, the refractive index of the first lens G1 is n1, the refractive index of the second lens G2 is n2, the refractive index n1 and the refractive index n2 simultaneously satisfy the relational expression, wherein n1 is larger than or equal to 1.6, and n2 is smaller than or equal to 1.9.
Further, the third lens G3 and the fourth lens G4 form a first cemented lens group U1, the fifth lens G5 and the sixth lens G6 form a second cemented lens group U2, and the focal length f of the first cemented lens group U1 isu1The focal length of the second cemented lens group U2 is fu2，fu1The ratio of f to f satisfies the relation: 0.3 < | fu1/f|＜1.0，fu2The ratio of f to f satisfies the relation: 20 < | fu2/f|＜30。
Further, the refractive index of the seventh lens G7 is n7, 1.8 ≦ n7 ≦ 2.0.
Further, eighthThe lens G8 and the ninth lens G9 form a third cemented lens group U3, and the eighth lens G8 has a focal length fG8The focal length of the ninth lens G9 is fG9，fG8And fG9The ratio of (A) satisfies the relation: 1.0 < | fG8/fG9|＜2.0。
Further, each lens is a spherical mirror.
The specific optical module data is as follows:
Figure BDA0002402484200000051
Figure BDA0002402484200000061
in this embodiment, the focal length F of the optical module is 25mm, the maximum aperture F # is 1.4, and the focal length F of the fixed group S1 is set131.23mm, focal length f of focus group S2269.79mm, the distance L from the vertex of the first lens G1 close to the object side surface to the image plane 2 is 41.49mm, the half-image height y' is 8.8mm, and the focal length f of the first cemented lens group U1U1-16.74mm, focal length f of the second cemented lens group U2U2Focal length f of the eighth lens G8 of-671.01 mmG8-54.87mm, focal length f of ninth lens G9G9＝30.53mm
Each relation: l f1/f|＝1.25；|f2/f|＝2.79；|L/f|＝1.66；
|y’/f|＝0.35；|fu1/f|＝0.67；|fu2/f|＝26.84；
|fG8/fG9|＝1.80
Satisfy the relation: 0.90<|f1/f|<1.60；2.0<|f2/f|<5.0；|L/f|＜2.0；
|y’/f|＜0.4；0.3＜|fu1/f|＜1.0；
20＜|fu2/f|＜30；1.0＜|fG8/fG9|＜2.0。
Example two
As shown in fig. 2, the present embodiment provides a high resolution large aperture lens, and the specific optical module data is as follows:
surface of Radius (mm) Thickness (mm) Refractive index
Front surface of G1 28.6 4.3 1.6
Rear surface of G1 1300.0 0.1
Front surface of G2 18.7 4.0 1.8
Rear surface of G2 40.4 0.7
U1 front surface 111.0 3.4 1.7
U1 cemented surface -55.5 1.2 1.6
U1 rear surface 10.9 4.0
Diaphragm Plane surface 9.6
U2 front surface -14.2 1.0 1.6
U2 cemented surface 22.4 4.0 1.8
U2 rear surface -22.6 0.1
Front surface of G7 312 2.2 1.9
Rear surface of G7 -43.1 1.9
U3 front surface 39.0 6.4 1.8
U3 cemented surface 14.9 5.1 1.6
U3 rear surface 155.8 11.3
Image plane Plane surface
In example two, the focal length F of the optical module is 35mm, the maximum aperture F # is 1.4, and the focal length F of the fixed set S1 is143.10mm, focal length f of focus group S22135.39mm, the distance L from the vertex of the first lens G1 close to the object side surface to the image plane 2 is 53.03mm, the half-image height y' is 8.8mm, and the focal length f of the first cemented lens group U1U1-18.55mm, focal length f of the second cemented lens group U2U2Focus of the eighth lens G8 ═ 721.23mmDistance fG8-34.25mm, focal length f of ninth lens G9G9＝24.98mm
Each relation: l f1/f|＝1.23；|f2/f|＝3.87；|L/f|＝1.52；
|y’/f|＝0.25；|fu1/f|＝0.53；|fu2/f|＝20.61；
|fG8/fG9|＝1.37。
Satisfy the relation: 0.90<|f1/f|<1.60；2.0<|f2/f|<5.0；|L/f|＜2.0；
|y’/f|＜0.4；0.3＜|fu1/f|＜1.0；20＜|fu2/f|＜30；
1.0＜|fG8/fG9|＜2.0。
The optical module of the high-resolution large-aperture lens is realized through the structure, the maximum aperture reaches F1.4, and the resolution of pixels can reach 1000 ten thousand levels; the working distance is wide, a floating focusing mode is adopted, corresponding imaging requirements can be met from 200mm to infinity, different application requirements can be met, and meanwhile the clear aperture can be flexibly adjusted.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding 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 herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1.一种高分辨率大光圈镜头，其特征在于，包括机械装置及安装于所述机械装置内部的光学模组，所述光学模组由物方到像方依次设置固定组S1和调焦组S2；1. a high-resolution large aperture lens, is characterized in that, comprises mechanical device and the optical module that is installed in described mechanical device, described optical module is successively provided with fixed group S1 and focus adjustment from object side to image side group S2; 所述固定组S1包括具有正光焦度及弯月结构的第一透镜G1、具有正光焦度及弯月结构的第二透镜G2、具有正光焦度及双凸结构的第三透镜G3、具有负光焦度及双凹结构的第四透镜G4、具有负光焦度及双凹结构的第五透镜G5、具有正光焦度及双凸结构的第六透镜G6、具有正光焦度及双凸结构的第七透镜G7；所述第四透镜G4和所述第五透镜G5之间设置有光阑；The fixed group S1 includes a first lens G1 with positive refractive power and a meniscus structure, a second lens G2 with positive refractive power and a meniscus structure, a third lens G3 with positive refractive power and a biconvex structure, and a negative The fourth lens G4 with power and double concave structure, the fifth lens G5 with negative power and double concave structure, the sixth lens G6 with positive power and double convex structure, with positive power and double convex structure The seventh lens G7; a diaphragm is provided between the fourth lens G4 and the fifth lens G5; 所述调焦组S2包括具有负光焦度的第八透镜G8和具有正光焦度的第九透镜G9；The focusing group S2 includes an eighth lens G8 with negative refractive power and a ninth lens G9 with positive refractive power; 所述光学模组的焦距f，所述固定组S1的焦距为f1，所述调焦组S2的焦距f2，f1和f的比值满足关系式：0.90＜|f1/f|＜1.60；f2和f的比值满足关系式：2.0＜|f2/f|＜5.0。The focal length f of the optical module, the focal length of the fixed group S1 is f 1 , the focal length f 2 of the focusing group S2 , the ratio of f 1 and f satisfies the relationship: 0.90<|f 1 /f|<1.60; the ratio of f 2 to f satisfies the relation: 2.0<|f 2 /f|<5.0. 2.根据权利要求1所述的高分辨率大光圈镜头，其特征在于，所述第一透镜G1靠近所述物方表面的顶点到所述像面的距离L与所述光学模组的焦距f，满足关系式：|L/f|＜2.0。2. The high-resolution large-aperture lens according to claim 1, wherein the distance L from the vertex of the first lens G1 close to the object-side surface to the image plane and the focal length of the optical module f, which satisfies the relation: |L/f|<2.0. 3.根据权利要求1所述的高分辨率大光圈镜头，其特征在于，所述光学模组的半像高y’与所述光学模组的焦距f，满足关系式：|y’/f|＜0.4。3. The high-resolution large-aperture lens according to claim 1, wherein the half-image height y' of the optical module and the focal length f of the optical module satisfy the relational expression: |y'/f |<0.4. 4.根据权利要求1所述的高分辨率大光圈镜头，其特征在于，所述第一透镜G1的折射率为n1，所述第二透镜G2的折射率为n2，所述折射率n1和所述折射率n2同时满足关系式，1.6≤n1、n2≤1.9。4. The high-resolution large-aperture lens according to claim 1, wherein the refractive index of the first lens G1 is n1, the refractive index of the second lens G2 is n2, the refractive index n1 and The refractive index n2 simultaneously satisfies the relational expressions, 1.6≤n1, n2≤1.9. 5.根据权利要求1所述的高分辨率大光圈镜头，其特征在于，所述第三透镜G3与所述第四透镜G4组成第一胶合透镜组U1，所述第五透镜G5与所述第六透镜G6组成第二胶合透镜组U2，所述第一胶合透镜组U1的焦距为fu1，所述第二胶合透镜组U2的焦距为fu2，fu1和f的比值满足关系式：0.3＜|fu1/f|＜1.0，fu2和f的比值满足关系式：20＜|fu2/f|＜30。5. The high-resolution large-aperture lens according to claim 1, wherein the third lens G3 and the fourth lens G4 form a first cemented lens group U1, and the fifth lens G5 and the The sixth lens G6 constitutes a second cemented lens group U2, the focal length of the first cemented lens group U1 is f u1 , the focal length of the second cemented lens group U2 is f u2 , and the ratio of f u1 to f satisfies the relationship: 0.3<|f u1 /f|<1.0, the ratio of f u2 and f satisfies the relation: 20<|f u2 /f|<30. 6.根据权利要求1所述的高分辨率大光圈镜头，其特征在于，所述第七透镜G7的折射率为n7，1.8≤n7≤2.0。6 . The high-resolution large-aperture lens according to claim 1 , wherein the refractive index of the seventh lens G7 is n7 , and 1.8≦n7≦2.0. 7 . 7.根据权利要求1所述的高分辨率大光圈镜头，其特征在于，所述第八透镜G8与所述第九透镜G9组成第三胶合透镜组U3，所述第八透镜G8的焦距为fG8，所述第九透镜G9的焦距为fG9，fG8和fG9的比值满足关系式：1.0＜|fG8/fG9|＜2.0。7. The high-resolution large-aperture lens according to claim 1, wherein the eighth lens G8 and the ninth lens G9 form a third cemented lens group U3, and the focal length of the eighth lens G8 is f G8 , the focal length of the ninth lens G9 is f G9 , and the ratio between f G8 and f G9 satisfies the relationship: 1.0<|f G8 /f G9 |<2.0. 8.根据权利要求1所述的高分辨率大光圈镜头，其特征在于，所述的各个透镜均为球面镜。8 . The high-resolution large-aperture lens according to claim 1 , wherein each of the lenses is a spherical mirror. 9 .
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022052260A1 (en) * 2020-09-09 2022-03-17 诚瑞光学(深圳)有限公司 Camera optical lens
WO2022056987A1 (en) * 2020-09-15 2022-03-24 诚瑞光学(深圳)有限公司 Camera optical lens

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