CN109696738B

CN109696738B - 16 mm-focal-length low-cost high-resolution low-distortion optical industrial lens

Info

Publication number: CN109696738B
Application number: CN201711003199.3A
Authority: CN
Inventors: 张岩松; 张勇; 吴沛林
Original assignee: GUANGZHOU CHIOPT OPTOTECH CO Ltd
Current assignee: HUNAN CHIOPT OPTICAL TECHNOLOGY Co.,Ltd.
Priority date: 2017-10-24
Filing date: 2017-10-24
Publication date: 2021-01-29
Anticipated expiration: 2037-10-24
Also published as: CN109696738A

Abstract

The invention discloses a low-cost high-resolution low-distortion optical industrial lens with a focal length of 16mm, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis. The first lens is a meniscus type negative diopter lens, and the convex surface faces the object side. The second lens is a biconvex positive diopter lens. The third lens is a meniscus type negative diopter lens, and the convex surface faces the object side. The fourth lens is a meniscus positive diopter lens, and the convex surface faces the object side. The fifth lens is a biconcave negative diopter lens. The sixth lens is a biconvex positive diopter lens. The seventh lens is double convex positive diopter. The optical industrial lens is simple in structure, and low distortion of an object distance from infinity to a close distance is achieved.

Description

16 mm-focal-length low-cost high-resolution low-distortion optical industrial lens

Technical Field

The invention relates to an optical lens, in particular to a low-cost high-resolution low-distortion optical industrial lens with a focal length of 16 mm.

Background

Since 2010, our country has gained explosive growth in the field of machine vision, the industrial cameras and lenses have also kept 40% increase, so that the market has demanded a large number of high-quality industrial lenses. On the other hand, in order to obtain high-quality images, the number of pixels of a photosensitive chip such as a CCD or a CMOS used for the image sensor is increasing. In order to match the image quality of the lens with the high pixels of the photosensitive chip, an additional lens is usually used, which increases the cost of the lens.

Disclosure of Invention

The present invention is directed to provide an optical industrial lens with few lenses, low cost, high resolution and low distortion, so as to solve the problems mentioned in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

a low-cost high-resolution low-distortion optical industrial lens with a focal length of 16mm comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side in sequence along an optical axis. The first lens is a meniscus type negative diopter lens, and the convex surface faces the object side. The second lens is a biconvex positive diopter lens. The third lens is a meniscus type negative diopter lens, and the convex surface faces the object side. The fourth lens is a meniscus positive diopter lens, and the convex surface faces the object side. The fifth lens is a biconcave negative diopter lens. The sixth lens is a biconvex positive diopter lens. The seventh lens is double convex positive diopter.

As a further scheme of the invention: the fifth lens and the sixth lens are closely connected to form a cemented lens group.

As a further scheme of the invention: the diaphragm is arranged between the fourth lens and the cemented lens group.

As a further scheme of the invention: the first lens satisfies the following condition:

f1/f<0

wherein f1 is the effective focal length of the first lens, and f is the effective focal length of the optical industrial lens.

As a further scheme of the invention: the first lens and the seventh lens satisfy the following condition:

0.5<│f1/f7│<5。

wherein f1 is the effective focal length of the first lens, and f7 is the effective focal length of the seventh lens.

As a further scheme of the invention: the seventh lens satisfies the following condition:

0<f7/f<10

wherein f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical industrial lens.

As a further scheme of the invention: there is no air space between the fifth lens and the sixth lens.

As a further scheme of the invention: a lens for 16mm focal length, low cost, high resolution and low distortion optical industrial lens is made of domestic optical glass material.

As a further scheme of the invention: all the lenses used by the low-cost high-resolution low-distortion optical industrial lens with the focal length of 16mm are spherical.

Compared with the prior art, the invention has the beneficial effects that: the optical industrial lens with the focal length of 16mm, the low cost, the high resolution and the low distortion is favorable for ensuring that the cost is reduced, and meanwhile, various aberrations of various wave bands are corrected, so that the central field and the edge field have enough resolution.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a low-cost, high-resolution, and low-distortion optical industrial lens with a focal length of 16mm according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic view of a lens arrangement of an embodiment of an industrial lens system according to the present invention, and for facilitating understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings.

In an embodiment of the present invention, an industrial optical lens with a focal length of 16mm, a high resolution and a low distortion includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens is a meniscus type negative diopter lens, and the convex surface faces the object side. The second lens is a biconvex positive diopter lens. The third lens is a meniscus type negative diopter lens, and the convex surface faces the object side. The fourth lens is a meniscus positive diopter lens, and the convex surface faces the object side. The fifth lens is a biconcave negative diopter lens. The sixth lens is a biconvex positive diopter lens. The seventh lens is double convex positive diopter.

The lenses used by the industrial lens are all made of domestic optical glass materials.

The lens surfaces used by the industrial lens are all spherical surfaces.

In addition, in order to maintain good optical performance of the industrial lens of the present invention, the industrial lens a in this embodiment should satisfy the following three conditions:

f1/f<0

0.5<│f1/f7│<5

0<f7/f<10

wherein f1 is the effective focal length of the first lens, f is the effective focal length of the optical industrial lens, and f7 is the effective focal length of the seventh lens.

In this embodiment, the relevant parameters of each lens are shown in table 1:

TABLE 1

The technical indexes realized by the invention are as follows:

1. focal length: f' =16 mm.

2. Short range: 100 mm.

3. Distortion: less than or equal to 0.5 percent.

4. Relative pore size D/f' = 1/2.8.

5. The angle of view is 2 omega: 31 deg.

6. Resolution ratio: 1000 ten thousand pixels.

7. The total optical length sigma is less than or equal to 50 mm.

8. The applicable spectrum range is as follows: 450 nm-650 nm.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some simple modifications, equivalent changes and modifications to some technical features without creative efforts based on the disclosed technical contents, and all fall into the technical solution of the present invention.

In the description of the present specification, it is to be noted that, unless explicitly stated or limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally 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 specifically understood by those of ordinary skill in the art.

Claims

1. A16 mm focal length low-cost high-resolution low-distortion optical industrial lens, comprising in order from an object side to an image side along an optical axis:

the first lens is a meniscus type negative diopter lens, and the convex surface faces the object side;

the second lens is a biconvex positive diopter lens;

the third lens is a meniscus type negative diopter lens, and the convex surface faces the object side;

the fourth lens is a meniscus positive diopter lens, and the convex surface faces the object side;

the fifth lens is a biconcave negative diopter lens;

the fifth lens and the sixth lens are connected to form a cemented lens group;

the seventh lens is double convex positive diopter;

the lens further comprises a diaphragm, and the diaphragm is arranged between the fourth lens and the cemented lens group.

2. A 16mm focal length, low cost, high resolution and low distortion optical industrial lens according to claim 1, wherein the first lens satisfies the following condition:

f1/f<0

wherein f1 is the effective focal length of the first lens, and f is the effective focal length of the industrial optical lens.

3. A 16mm focal length, low cost, high resolution and low distortion optical industrial lens according to claim 1, wherein the first lens and the seventh lens satisfy the following condition:

0.5<│f1/f7│<5

4. A 16mm focal length, low cost, high resolution and low distortion optical industrial lens according to claim 1, wherein the seventh lens satisfies the following condition:

0<f7/f<10

wherein f7 is the effective focal length of the seventh lens, and f is the effective focal length of the industrial optical lens.