CN109752820B

CN109752820B - High-resolution low-distortion micro-distance industrial lens

Info

Publication number: CN109752820B
Application number: CN201711055220.4A
Authority: CN
Inventors: 林宏金; 白振; 吴沛林
Original assignee: GUANGZHOU CHIOPT OPTOTECH CO Ltd
Current assignee: Hunan Chiopt Optical Technology Co ltd
Priority date: 2017-11-01
Filing date: 2017-11-01
Publication date: 2024-03-29
Anticipated expiration: 2037-11-01
Also published as: CN109752820A

Abstract

The invention discloses a high-resolution low-distortion micro-distance industrial lens, which comprises a front group lens, an iris diaphragm and a rear group lens which are sequentially arranged in a lens structure along the incident direction of light, wherein the focusing is completed through the simultaneous movement of six lens groups and the iris diaphragm along the optical axis direction, the working distance is 50mm-160mm, the lens sequentially comprises a first convex lens, a second convex lens, a third concave lens, a fourth concave lens and a fifth convex lens, which are tightly adhered, and the sixth lens is a low-distortion micro-distance industrial lens formed by the convex lenses, the structure is simple, the focusing is realized by adopting a whole group moving mode, the near imaging distance can reach 59mm, clear imaging is realized on a nearer object distance, the distortion is less than 0.05 percent, the low-distortion requirement of the industrial lens is met, and the lens can be combined with 16: and 9-system 1.1 high-resolution cameras.

Description

High-resolution low-distortion micro-distance industrial lens

Technical Field

The invention relates to the technical field of industrial equipment, in particular to a high-resolution low-distortion micro-distance industrial lens.

Background

As industrial lenses are increasingly used in detection application fields, the lenses in the market cannot meet the use requirements of clients: high resolution, low distortion, the microspur, not only the structure is complicated, and focusing is inconvenient moreover, can't realize near photographic, can't realize clear formation of image on nearer object distance, also can't satisfy the low distortion requirement of industrial camera lens, is not applicable to 16: and 9-system 1.1 high-resolution cameras.

Disclosure of Invention

The invention aims to provide a high-resolution low-distortion micro-distance industrial lens which is simple in structure and capable of achieving adjustment focusing in different multiplying power ranges so as to solve the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a high-resolution low-distortion micro-industrial lens comprises a front group of lenses, an iris diaphragm and a rear group of lenses which are arranged in a lens structure in sequence along the incident direction of light rays. The lens is composed of a first convex lens, a second convex lens, a third concave lens, a fourth concave lens and a fifth convex lens which are tightly adhered, and a sixth convex lens which is a low-distortion micro-distance industrial lens.

As a further scheme of the invention: the space between the first convex lens and the second convex lens is 0.1mm, and the space between the second convex lens and the third concave lens is 0.92mm.

As a further scheme of the invention: the air interval between the front group of lenses and the rear group of lenses is 6mm, the distance between the front group of lenses and the iris diaphragm is 3.58mm, and the distance between the rear group of lenses and the iris diaphragm is 2.42mm.

As a further scheme of the invention: the distance between the glued lens tightly adhered by the fourth concave lens and the fifth convex lens and the sixth convex lens is 0.1mm.

As a further scheme of the invention: the lens structure comprises a front lens barrel for mounting a front lens, and the adjustable diaphragm is arranged in a rear lens barrel.

As a further scheme of the invention: the focal lengths of the first lens group and the second lens group meet the following conditional expression:

conditional expression: 2< |fl/f2| <9

Conditional expression: 2< |f1/f0| <10

Conditional expression: 0.2< |f2/f0| <5

Where f1 represents the focal length of the first lens group, f2 represents the focal length of the second lens group, and f0 represents the focal length of the entire lens.

Compared with the prior art, the invention has the beneficial effects that: the high-resolution low-distortion micro-distance industrial lens is simple in structure, adopts a whole group of moving mode for focusing, can achieve close-up imaging distance of 59mm, achieves clear imaging on closer object distance, achieves distortion of less than 0.05% to meet the low-distortion requirement of the industrial lens, and can achieve the following effects of 16: and 9-system 1.1 high-resolution cameras.

Drawings

Fig. 1 is a schematic structural drawing of the optical path system of the present invention.

Fig. 2 is a distortion variation curve of the present invention.

Fig. 3 is a diagram of lens parameters according to the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 to 3, in an embodiment of the present invention, a high resolution low distortion macro industrial lens includes a lens structure and an optical path system disposed in the lens structure, where the lens structure includes a main lens barrel, a front lens barrel and a rear lens barrel connected to a rear side of the front lens barrel are disposed in the main lens barrel, a C interface connected to a camera is disposed at a rear end of the main lens barrel, an adjustable diaphragm connected to a light flux of the lens is disposed in the lens barrel, and the front lens barrel is sequentially composed of a first convex lens 1, a second convex lens 2 and a third concave lens 3; the rear group is composed of a fourth concave lens 4 and a fifth convex lens 5 which are tightly adhered, and a sixth lens is a low-distortion micro-industrial lens composed of convex lenses 6.

In this embodiment, the air gap between the front lens set and the rear lens set is 6mm. The distance between the front group and the iris diaphragm is 3.58mm, and the distance between the rear group and the iris diaphragm is 2.42mm.

In this embodiment, the distance between the fourth five concave lenses and the sixth convex lens and the glued lens tightly adhered to the sixth convex lens is 0.1mm.

In this embodiment, the lens structure includes a front lens barrel for mounting a front lens, and the adjustable diaphragm is disposed in a rear lens barrel.

In this embodiment, the lens adopts an integral focusing mode, and the resolution of the lens can reach 10000 ten thousand pixels.

The technical indexes of the invention are as follows:

1. focal length: f=35 mm

2. Distortion: less than or equal to 0.5 percent

3. Relative pore diameter D/f=2.8

4. Resolution ratio: better than 1000 ten thousand pixels

Referring to fig. 3, the high-resolution low-distortion macro industrial lens has a focal length of 35mm, an image height of 16.8mm, an image aperture of 2.8, a magnification range of-0.25 to-1.2 and a back focus variation range of 34.6 to 68.2.

The foregoing is merely illustrative of the principles and advantages of the invention, and it will be apparent to those skilled in the art that, in light of the teachings of this invention, various modifications, alterations and adaptations can be made without requiring inventive faculty in designing high resolution low distortion macro industrial lenses without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The high-resolution low-distortion micro-distance industrial lens comprises a front group of lenses, an iris diaphragm and a rear group of lenses which are sequentially arranged in a lens structure along the incidence direction of light, wherein the lenses sequentially comprise a first convex lens, a second convex lens, a third concave lens, a fourth concave lens, a bonding lens tightly bonded with a fifth convex lens and a sixth low-distortion micro-distance industrial lens formed by the convex lenses;

the interval between the first convex lens and the second convex lens is 0.1mm, and the interval between the second convex lens and the third concave lens is 0.92mm;

the air interval between the front group of lenses and the rear group of lenses is 6mm, the distance between the front group of lenses and the iris diaphragm is 3.58mm, and the distance between the rear group of lenses and the iris diaphragm is 2.42mm;

the distance between the glued lens tightly adhered by the fourth concave lens and the fifth convex lens and the sixth convex lens is 0.1mm;

the adjustable diaphragm is arranged between the front group lens barrel and the rear group lens barrel;

the magnification range of the lens is-0.25X to-1.2X, and the back focus variation range is 30-70mm;

the focal lengths of the first lens group and the second lens group meet the following conditional expression:

conditional expression: 2< |fl/f2| <9

Conditional expression: 2< |f1/f0| <10

Conditional expression: 0.2< |f2/f0| <5