CN211603693U

CN211603693U - 35MM industrial lens system

Info

Publication number: CN211603693U
Application number: CN202020577715.4U
Authority: CN
Inventors: 刘翠
Original assignee: GUANGZHOU CHIOPT OPTOTECH CO Ltd
Current assignee: Hunan Chiopt Optical Technology Co ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-09-29
Anticipated expiration: 2030-04-17

Abstract

The utility model discloses a 35MM industry camera lens system, including the positive spherical lens of first list, the single negative spherical lens of second, diaphragm unit and the single positive spherical lens of third, the positive spherical lens of first list, the single negative spherical lens of second and the single positive spherical lens of third set gradually to the mirror image from the object space, and the diaphragm unit is established between the single negative spherical lens of second and the single positive spherical lens of third, the utility model discloses a 35MM industry camera lens system, the material that the spherical lens adopted is high refractive index glass, the material that the single negative spherical lens of second adopted is low dispersion coefficient glass, and the effectual aberration that has reduced among the optical system not only makes simple structure, and the preparation is convenient, has effectively improved the imaging effect moreover, has reduced the cost of manufacture.

Description

35MM industrial lens system

Technical Field

The utility model relates to a machine-building technical field specifically is a 35MM industry lens system.

Background

With the high-speed growth of modern industrial production, the development of industrial detection is more mature, the application environment is more complex, and the low-cost detection scheme is still the direction of some application scenarios.

The 35mm industrial lens system is mainly designed for providing a plurality of low-cost detection schemes in the field of machine vision, has the F.NO of 2.8 and the focal length of 35mm, and is suitable for the application of 1/1.7 camera chips. Is a common focal length section and a camera in the current market.

Disclosure of Invention

An object of the utility model is to provide a 35MM industry lens system to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a 35MM industry lens system, includes first single positive spherical lens, the single negative spherical lens of second, diaphragm unit and the single positive spherical lens of third, first single positive spherical lens, the single negative spherical lens of second and the single positive spherical lens of third begin to set gradually to the mirror image from the object space, and the diaphragm unit is established between the single negative spherical lens of second and the single positive spherical lens of third.

As a further technical solution of the present invention: the first single positive spherical lens is a biconvex positive lens, the dispersion coefficient Vd of the first single positive spherical lens is 43.1, the refractive index Nd is 1.84, the curvature radius R11 of the first single positive spherical lens facing to the object side front surface is 15< R11<20mm, the curvature radius R12 of the first single positive spherical lens facing to the image side rear surface is-600 < R12< -500mm, and the core thickness d1 is 4.5< d1<5 mm.

As a further technical solution of the present invention: the second single negative spherical lens is a double-concave negative lens, the dispersion coefficient Vd of the second single positive spherical lens is 23.6, the refractive index Nd is 1.85, the curvature radius R21 of the second single positive spherical lens facing to the object side front surface is-25 < R21< -20mm, the curvature radius R22 of the second single positive spherical lens facing to the image side rear surface is 10< R22<15mm, and the core thickness d3 is 3< d3<4.5 mm.

As a further technical solution of the present invention: the third single positive spherical lens is a biconvex positive lens.

As a further technical solution of the present invention: the third positive spherical lens has an dispersion coefficient Vd of 46.6, a refractive index Nd of 1.8, a radius of curvature R31 towards the object side front surface of 35< R31<40mm, a radius of curvature R32 towards the image side rear surface of-20 < R32< -15mm, and a core thickness d5 of 5< d5<10 mm.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a 35mm industry camera lens system, the material that spherical lens adopted is high refractive index glass, the material that the single burden spherical lens of second adopted is low dispersion coefficient glass, the effectual aberration that reduces among the optical system not only makes simple structure, and the preparation is convenient, has effectively improved the imaging effect moreover, has reduced the cost of manufacture.

Drawings

Fig. 1 is an optical cross-sectional view of an optical system according to the present invention;

FIG. 2 is an enlarged cross-sectional view of a first lens of one of the optical systems of the present invention;

FIG. 3 is an enlarged cross-sectional view of a second optical element of one of the optical systems of the present invention;

FIG. 4 is an enlarged cross-sectional view of the third optical element of one of the optical systems of the present invention;

wherein, 1-a first single positive spherical lens, 2-a second single negative spherical lens, 3-a third diaphragm, 4-a fourth single negative spherical lens and 5-an image surface;

d 1-the thickness of the first lens core, d 2-the air space between the first lens and the second lens, d 3-the thickness of the second lens core, d 4-the air space between the second lens and the diaphragm, d 5-the air space between the diaphragm and the third lens, d 6-the thickness of the third lens core, d 7-the air space between the third lens and the image surface, R11-the curvature radius of the first surface of the first single spherical lens, R12-the curvature radius of the second surface of the first single spherical lens, R21-the curvature radius of the first surface of the second single spherical lens, R22-the curvature radius of the second surface of the second single spherical lens, R31-the curvature radius of the first surface of the third single spherical lens, and R32-the curvature radius of the second surface of the third single spherical lens.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, example 1: the utility model provides a 35MM industry lens system, includes first single positive spherical lens 1, the single negative spherical lens 2 of second, diaphragm unit 3 and the single positive spherical lens 4 of third, first single positive spherical lens 1, the single negative spherical lens 2 of second and the single positive spherical lens 4 of third begin to set gradually to mirror image 5 from the object direction, and diaphragm unit 3 is established between single negative spherical lens 2 of second and the single positive spherical lens 4 of third.

Referring to fig. 1 and 2, the first single positive spherical lens 1 is a biconvex positive lens, R11 and R12 are curvature radii of a front surface and a rear surface of the lens, respectively, the first single positive spherical lens 1 has an abbe number Vd of 43.1 and a refractive index Nd of 1.84, a curvature radius R11 of the front surface facing the object side is 15< R11<20mm, a curvature radius R12 of the rear surface facing the image side is-600 < R12< -500mm, wherein a core thickness d1 is 4.5< d1<5mm, in the embodiment, a curvature radius R11 of the front surface facing the object side is 16.7mm, a curvature radius R12 of the rear surface facing the image side is-544.6 mm, and a core thickness d1 is 4.7 mm.

Referring to fig. 1 and 3, the second single negative spherical lens 2 is a biconcave negative lens, R21 and R22 are curvature radii of the front surface and the rear surface of the lens, respectively, the second single positive spherical lens 2 has an abbe number Vd of 23.6 and a refractive index Nd of 1.85, the curvature radius R21 of the front surface facing the object side is-25 < R21< -20mm, the curvature radius R22 of the rear surface facing the image side is 10< R22<15mm, wherein the core thickness d3 is 3< d3<4.5mm, in this embodiment, the curvature radius R21 of the front surface facing the object side is-24.5 mm, the curvature radius R22 of the rear surface facing the image side is 11.2mm, the core thickness d3 is 3.8mm, and the distance d2 between the second single negative spherical lens 2 and the adjacent surface at the center of the single positive spherical lens 1 is 4.5 mm.

Referring to fig. 1 and 4, the third positive spherical lens 4 is a biconvex positive lens, R31 and R32 are curvature radii of the front surface and the rear surface of the lens, respectively, the third positive spherical lens 3 has an abbe Vd of 46.6 and a refractive index Nd of 1.8, a curvature radius R31 of the front surface facing the object side is 35< R31<40mm, a curvature radius R32 of the rear surface facing the image side is-20 < R32< -15mm, wherein a core thickness d5 is 5< d5<10mm, in this embodiment, the curvature radius R31 of the front surface facing the object side is 38.9mm, the curvature radius R32 of the rear surface facing the image side is-17.6 mm, wherein the core thickness d6 is 7.78mm,

the diaphragm unit 3 is arranged between the second single negative spherical lens 2 and the third positive spherical lens 4, the distance d4 between the center of the second single negative spherical lens 2 and the diaphragm unit 3 is 2.4mm, and the distance d5 between the center of the fifth single negative spherical lens 5 and the diaphragm unit 4 is 2.1 mm.

By adopting the glass, the aberration in an optical system can be effectively reduced.

Example 2, based on example 1 above, the present design needs to satisfy the following conditional expression:

F.NO = 2.8，EFL=35mm ，TTL=50.5mm；

wherein, f.no is the relative aperture of the lens, EFL is the effective focal length of the lens, and TTL is the total optical length of the lens (the length from the top of the first single lens to the image plane). Further, a 35mm industrial lens system, wherein a set of optical system characteristics satisfies the following conditional expression:

f/f1= 3.72，f1=19.42mm，

f/f2=-4.04，f2=-8.67mm，

f/f3= 2.18，f3=18.07mm，

where f is the effective focal length of the lens, f1 is the focal length of the first single positive spherical lens, f2 is the focal length of the second single negative spherical lens, and f3 is the focal length of the fourth single negative spherical lens.

The glass material of the 35mm industrial lens system meets the following requirements:

the first single-positive-spherical-surface lens material satisfies: 1.8< Nd <1.85,40< Vd < 50;

the second single negative spherical lens material satisfies: 1.8< Nd <1.85,20< Vd < 30;

the fourth single-spherical-surface lens material satisfies: 1.75< Nd <1.8,45< Vd < 55.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a 35MM industry lens system, includes first single positive spherical lens (1), the single negative spherical lens of second (2), diaphragm unit (3) and the single positive spherical lens of third (4), its characterized in that, first single positive spherical lens (1), the single negative spherical lens of second (2) and the single positive spherical lens of third (4) set gradually to mirror image (5) from the object direction, and diaphragm unit (3) are established between single negative spherical lens of second (2) and the single positive spherical lens of third (4).

2. A 35MM industrial lens system according to claim 1, wherein the first single positive spherical lens (1) is a biconvex positive lens, the first single positive spherical lens (1) has an abbe number Vd of 43.1 and a refractive index Nd of 1.84, a radius of curvature R11 towards the object side front surface of 15< R11<20MM, a radius of curvature R12 towards the image side rear surface of-600 < R12< -500MM, and a core thickness d1 of 4.5< d1<5 MM.

3. A 35MM industrial lens system according to claim 1, wherein the second single negative spherical lens (2) is a biconcave negative lens, the second single positive spherical lens (2) has an abbe number Vd of 23.6 and a refractive index Nd of 1.85, a radius of curvature R21 towards the object front surface of-25 < R21< -20MM, a radius of curvature R22 towards the image rear surface of 10< R22<15MM, and a core thickness d3 of 3< d3<4.5 MM.

4. A 35MM industrial lens system according to claim 1, wherein the third single positive spherical lens (4) is a biconvex positive lens.

5. A35 MM industrial lens system according to claim 4, wherein said third single positive spherical lens (4) has an Abbe Vd of 46.6 and a refractive index Nd of 1.8, a radius of curvature R31 towards the object side front surface of 35< R31<40MM, a radius of curvature R32 towards the image side rear surface of-20 < R32< -15MM, and a core thickness d5 of 5< d5<10 MM.