CN218886307U

CN218886307U - Eyepiece lens with large field angle for visual system

Info

Publication number: CN218886307U
Application number: CN202320036406.XU
Authority: CN
Inventors: 杨国柱
Original assignee: Zhongshan Mavinlens Optical Co Ltd
Current assignee: Zhongshan Mavinlens Optical Co Ltd
Priority date: 2023-01-07
Filing date: 2023-01-07
Publication date: 2023-04-18
Anticipated expiration: 2033-01-07

Abstract

The utility model discloses an eyepiece lens with a large field angle for a visual system, which comprises a first lens G1, a second lens G2, a third lens G3, a fourth lens G4 and a fifth lens G5 which are arranged in sequence along an optical axis L from an eye side to an image side, wherein the first lens G1 is a plano-convex lens and has positive focal power; the second lens G2 is a plano-convex lens and has positive focal power; the third lens G3 is a convex lens, the fourth lens G4 is a concave lens, and the third lens G3 and the fourth lens G4 are glued together to form a cemented lens group G10 with negative focal power; the fifth lens G5 is a biconvex aspherical lens having positive power. The device adopts 5 ocular lenses and a reasonable layout structure to obtain uniform picture quality, the difference between the quality of the edge of a view field and the central image is small, and the picture has uniform impression effect; the appearance is reduced, and the weight is correspondingly reduced; with a larger field angle, the field angle FOV equals 40 °.

Description

Eyepiece lens with large field angle for visual system

Technical Field

The utility model relates to an eyepiece camera lens that is used for visual system to have a big angle of vision.

Background

Currently, an eyepiece lens for a visual system has a structure shown in fig. 1, and includes a first lens G01, a second lens G02, a third lens G03, and a fourth lens G4 arranged along an optical axis and mounted inside a lens barrel; the second lens G02 and the third lens G03 are glued together, the first lens G01 adopts a biconvex lens with positive focal power, the second lens G02 is a convex lens, the third lens G03 is a concave lens, and the third lens G3 is glued with the fourth lens G4; the fourth lens G4 is a plano-convex lens having a positive refractive power.

The existing structure adopts a lens structure of 4 eyepiece lenses, so that the quality difference between the edge of a view field and a central image is large and the impression effect is poor during viewing; the profile is large, the diameter is about 38.5mm, the length is about 22.9mm, and the weight is about 60g; and the field angle FOV is equal to 37 deg., the field angle FOV being smaller.

Disclosure of Invention

The utility model aims at providing an eyepiece lens with a large field angle for a visual system, which solves the problems that the eyepiece lens for the visual system in the prior art adopts a structure of 4 eyepiece lenses, so that the difference between the quality of the image at the edge of the field of view and the quality of the image at the center is large and the impression effect is poor; large appearance, heavy weight and small field angle FOV.

The technical scheme of the utility model is realized like this:

an eyepiece lens having a large angle of field for a visual system, comprising a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, and a fifth lens G5 arranged in this order along an optical axis L from an eye side to an image side, wherein;

the first lens G1 is a plano-convex lens with positive focal power, the plane S1 is close to the eye side, and the convex surface S2 faces the incident direction of light;

the second lens G2 is a plano-convex lens with positive focal power, the plane S4 faces the incident direction of light rays, and the convex surface S3 faces the eye side;

the third lens G3 is a convex lens, the fourth lens G4 is a concave lens, the third lens G3 and the fourth lens G4 are glued together to form a cemented lens group G10, the cemented lens group G10 has negative focal power, a convex surface S5 of the cemented lens group G10 faces to the eye side, and a concave surface S7 of the cemented lens group G10 faces to the image side;

the fifth lens G5 is a biconvex aspheric lens having a positive refractive power.

The first lens G1, the second lens G2, the third lens G3, the fourth lens G4 and the fifth lens G5 are arranged in the lens barrel, the focusing barrel is sleeved outside the front end of the lens barrel, the connecting barrel is sleeved outside the rear end of the lens barrel, and the lens barrel is in threaded connection with the connecting barrel.

The first lens G1 and the second lens G2 are separated by a first spacer, the second lens G2 and the cemented lens group G10 are separated by a second spacer, and the first spacer and the second spacer are both mounted inside the lens barrel.

A first sealing ring is arranged between the lens cone and the connecting cylinder.

The space between the lens barrel and the focusing barrel is sealed by a second sealing ring.

Compared with the prior art, the utility model, there is following advantage:

1. the utility model adopts 5 pieces of eyepiece pieces and a reasonable layout structure to obtain even picture quality, the difference between the view field edge and the central picture quality is small, and the picture has even impression effect; the shape becomes smaller, the diameter is about 32mm, the length is about 22mm, the weight is correspondingly reduced, and the weight is about 40g; with a larger field angle, the field angle FOV equals 40 °.

2. Other advantages of the present invention are described in detail in the examples section of this specification.

Drawings

Fig. 1 is a structural sectional view of an eyepiece lens having a large field angle of a conventional visual system;

fig. 2 is an optical schematic diagram of the present invention;

fig. 3 is a perspective view of an angle of the present invention;

fig. 4 is a perspective view of another angle of the present invention;

fig. 5 is a structural sectional view of the present invention;

FIG. 6 is a schematic drawing of FIG. 5 with dimensions indicated;

fig. 7 is an exploded view of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.

The first embodiment is as follows:

as shown in fig. 2 to 7, the present embodiment provides an eyepiece lens having a large angle of field for a visual system, including a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, and a fifth lens G5, which are arranged in this order along an optical axis L from an eye side to an image side, wherein;

the third lens G3 is a convex lens, the fourth lens G4 is a concave lens, the third lens G3 and the fourth lens G4 are glued together to form a cemented lens group G10, the cemented lens group G10 has negative focal power, a convex surface S5 of the cemented lens group G10 faces to the eye side, a concave surface S7 of the cemented lens group G10 faces to the image side, and the third lens G3 and the fourth lens G4 are glued to form a cemented surface S6;

The utility model adopts 5 pieces of eyepiece pieces and a reasonable layout structure to obtain even picture quality, small difference between the view field edge and the central picture quality and even picture impression effect; the shape becomes smaller, the diameter is about 32mm, the length is about 22mm, the weight is correspondingly reduced, and the weight is about 40g; with a larger field angle, the field angle FOV equals 40 °.

The first lens G1, the second lens G2, the third lens G3, the fourth lens G4 and the fifth lens G5 are arranged in the lens barrel 1, the focusing barrel 2 is sleeved outside the front end of the lens barrel 1, the connecting barrel 3 is sleeved outside the rear end of the lens barrel 1, and the lens barrel 1 is in threaded connection with the connecting barrel 3. Simple structure and convenient installation.

The first lens G1 and the second lens G2 are separated by a first spacer 4, the second lens G2 and the cemented lens group G10 are separated by a second spacer 5, and the first spacer 4 and the second spacer 5 are both mounted inside the lens barrel 1. A first seal ring 6 is mounted between the lens barrel 1 and the connecting cylinder 3. The space between the lens barrel 1 and the focusing barrel 2 is sealed by the second seal ring 7. It is rationally distributed, simple to operate, the leakproofness is good.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement modes, and are all included in the scope of the present invention.

Claims

1. An eyepiece lens having a large angle of field for a visual system, comprising a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, and a fifth lens G5 arranged in this order along an optical axis L from an eye side to an image side, wherein;

2. An eyepiece lens with a large field angle for a vision system as recited in claim 1, wherein: the first lens G1, the second lens G2, the third lens G3, the fourth lens G4 and the fifth lens G5 are installed in the lens barrel (1), the focusing barrel (2) is sleeved outside the front end of the lens barrel (1), the connecting barrel (3) is sleeved outside the rear end of the lens barrel (1), and the lens barrel (1) is in threaded connection with the connecting barrel (3).

3. An eyepiece lens with a large field angle for a vision system as recited in claim 2 wherein: the first lens G1 and the second lens G2 are separated by a first spacing ring (4), the second lens G2 and the cemented lens group G10 are separated by a second spacing ring (5), and the first spacing ring (4) and the second spacing ring (5) are both arranged in the lens barrel (1).

4. An eyepiece lens with a large field angle for a vision system as recited in claim 3, wherein: a first sealing ring (6) is arranged between the lens cone (1) and the connecting cylinder (3).

5. An eyepiece lens with a large field angle for a vision system as recited in claim 4, wherein: the space between the lens barrel (1) and the focusing barrel (2) is sealed by a second sealing ring (7).