CN218524954U

CN218524954U - Eyepiece system of sighting device

Info

Publication number: CN218524954U
Application number: CN202222499160.8U
Authority: CN
Inventors: 周琪; 陈健兵; 丁优; 徐梦颖; 喻腾腾; 曾伟伟
Original assignee: Jiangxi Gaorui Photoelectric Co ltd
Current assignee: Jiangxi Gaorui Photoelectric Co ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-02-24
Anticipated expiration: 2032-09-21

Abstract

The utility model provides an aim at utensil eyepiece system, including optical system, optical system includes along the optical axis from the thing side to the image side arrange the first biconvex lens P1, second biconvex lens P2 and the third meniscus lens P3 that set up in proper order, and wherein, first biconvex lens P1, second biconvex lens P2 and third meniscus lens P3 are the aspheric surface lens, and the aspheric surface lens need satisfy following expression:

wherein: z represents the rise of the even-order aspherical surface from the vertex of the aspherical surface at a position of height r in the optical axis direction, c represents the curvature of the vertex of the surface, k represents a conic coefficient, α ₄ 、α ₆ 、α ₈ 、α ₁₀ Express high order aspheric surface coefficient, the utility model discloses the structure is relatively simpler, the cost is relatively lower to can realize that the exit pupil diameter is great, magnification is close 20X, satisfy the demand of high-demand product.

Description

Eyepiece system of sighting device

Technical Field

The utility model belongs to the technical field of the camera lens manufacturing technique and specifically relates to indicate an aim utensil eyepiece system.

Background

The mechanical sighting device is particularly suitable for a middle-sized gun or a heavy gun. An eyepiece optical system of the existing firearm sighting telescope has a large exit pupil diameter, but the magnification is less than 20 x; even if the magnifying power is close to 20X, 4-6 lenses are needed, the structure is relatively complex, and therefore, an eyepiece system of the sighting device which has a relatively simple structure and relatively low cost, can realize a large exit pupil diameter and has the magnifying power close to 20X needs to be developed.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

An object of the utility model is to provide an aim utensil eyepiece system, the structure is relatively fairly simpler, the cost is relatively lower to can realize that the exit pupil diameter is great, magnification is close 20X, satisfies the demand of high-demand product. In order to achieve the above purpose, the utility model adopts the following technical scheme:

(II) technical scheme

An eyepiece lens system of a sighting telescope, comprising an optical system including a first biconvex lens P1, a second biconvex lens P2 and a third meniscus lens P3 arranged in this order from an object side to an image side along an optical axis, wherein the first biconvex lens P1, the second biconvex lens P2 and the third meniscus lens P3 are aspheric lenses that satisfy the following expressions:

wherein: z represents the rise of the even-order aspherical surface from the vertex of the aspherical surface at a position of r in the optical axis directionC denotes the curvature of the surface vertex, k denotes the conic coefficient, α ₄ 、α ₆ 、α ₈ 、α ₁₀ Representing high-order aspheric coefficients.

Furthermore, antireflection films are plated on the front surfaces and the rear surfaces of the first biconvex lens P1, the second biconvex lens P2 and the third meniscus lens P3.

Further, the refractive index of the first biconvex lens P1 is n1, the refractive index of the second biconvex lens P2 is n2, and the refractive index of the third meniscus lens P3 is n3, which satisfy the following relation: n1 is more than or equal to 1.50 and less than or equal to 1.55, n2 is more than or equal to 1.5 and less than or equal to 1.55, and n3 is more than or equal to 1.50 and less than or equal to 1.55.

(III) advantageous effects

Compared with the prior art, the utility model have obvious advantage and beneficial effect, particularly, the utility model adopts the three aspheric surface lens of above-mentioned characteristic to constitute, the structure is relatively simple, greatly reduced the cost to it realizes that the exit pupil diameter is phi 5mm, and magnification can reach 22.7 x, satisfies the demand of high-demand product.

Drawings

FIG. 1 is an optical block diagram of the present invention;

fig. 2 is a MTF graph of an optical system in an embodiment of the present invention;

fig. 3 is a distortion diagram of an optical system according to an embodiment of the present invention.

The reference numbers illustrate:

1. optical filter

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 3, an eyepiece system of a sighting telescope includes an optical system, the optical system includes a first biconvex lens P1, a second biconvex lens P2, and a third biconvex lens P3 arranged in sequence from an object side to an image side along an optical axis, where the first biconvex lens P1, the second biconvex lens P2, and the third biconvex lens P3 are aspheric lenses, and the aspheric lenses need to satisfy the following expressions:

wherein: z represents the rise of the even-order aspherical surface from the vertex of the aspherical surface at a position of height r in the optical axis direction, c represents the curvature of the surface vertex, k represents a conic coefficient, α ₄ 、α ₆ 、α ₈ 、α ₁₀ Representing high-order aspheric coefficients.

Preferably, antireflection films are coated on the front surfaces and the rear surfaces of the first biconvex lens P1, the second biconvex lens P2 and the third meniscus lens P3.

Preferably, the refractive index of the first biconvex lens P1 is n1, the refractive index of the second biconvex lens P2 is n2, and the refractive index of the third meniscus lens P3 is n3, and they satisfy the following relation: n1 is more than or equal to 1.50 and less than or equal to 1.55, n2 is more than or equal to 1.5 and less than or equal to 1.55, and n3 is more than or equal to 1.50 and less than or equal to 1.55.

In this embodiment, set up light filter 1 behind third meniscus P3, first biconvex lens P1, second biconvex lens P2 and third meniscus P3 are the aspheric surface, and aspheric cone coefficient value and each rank of aspheric coefficient can set up to suitable numerical value, the utility model discloses in the embodiment the aspheric cone coefficient value and each rank of aspheric coefficient of all lenses are shown as following table, and wherein K is aspheric cone coefficient, and a1, a2, a3, a4 correspond alpha respectively ₄ 、α ₆ 、α ₈ 、α ₁₀ The aspherical surface coefficient of (2).

Flour mark	K	a1	a2	a3	a4
						P1 front curve	4.593	7.918*10 ^-5	-7.541*10	9.309*10 ^-8	-3.172*10
P1 back curve	-3.479	1.523*10 ^-4	-3.703*10	4.636*10 ^-8	-1.731*10
						P2 front curve	-23.37	5.459*10 ^-4	-4.616*10	1.359*10 ^-7	-1.824*10 ^-9
P2 back curve	-9.796	-2.129*10	2.241*10 ^-6	2.271*10 ^-8	-3.72*10 ^-10
						P3 front curve	-3.53	1.065*10 ^-3	-2.371*10	2.637*10 ^-7	-3.073*10
P3 back curve	-4.29	3.533*10 ^-5	-2.077*10	1.174*10 ^-5	-2.245*10 ^-7

In the present embodiment, the relevant parameters of each lens:

in the present embodiment, the refractive index n1 of the first biconvex lens P1 is 1.53, the refractive index n2 of the second biconvex lens P2 is 1.53, and the refractive index n3 of the third meniscus lens P3 is 1.52, which satisfy the relationship: n1 is more than or equal to 1.50 and less than or equal to 1.55, n2 is more than or equal to 1.5 and less than or equal to 1.55, and n3 is more than or equal to 1.50 and less than or equal to 1.55. The magnification of this example is 22.7 ×, the effective focal length is 11mm, the exit pupil diameter is Φ 5mm, the exit pupil distance is 20mm, the circular field of view is 32.3 °, the total optical length is 39.3mm, the diopter is ± 5D, and low distortion performance is achieved.

The utility model adopts the above characteristics three aspheric surface lens to constitute, the structure is relatively simpler, greatly reduced the cost to it realizes that the exit pupil diameter is phi 5mm, and magnification is 22.7 x, satisfies the demand of high-demand product.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. An eyepiece system of an aiming device comprises an optical system, and is characterized in that: the optical system comprises a first biconvex lens P1, a second biconvex lens P2 and a third meniscus lens P3 which are arranged in sequence from an object side to an image side along an optical axis, wherein the first biconvex lens P1, the second biconvex lens P2 and the third meniscus lens P3 are all aspheric lenses which need to satisfy the following expressions:

wherein: z represents the rise of the even-order aspherical surface from the vertex of the aspherical surface at a position of height r in the optical axis direction, c represents the curvature of the vertex of the surface, k represents a conic coefficient, α ₄ 、α ₆ 、α ₈ 、α ₁₀ Representing high-order aspheric coefficients.

2. The sight eyepiece system of claim 1, wherein: and antireflection films are plated on the front surfaces and the rear surfaces of the first biconvex lens P1, the second biconvex lens P2 and the third concave-convex lens P3.

3. The sight eyepiece system of claim 1, wherein: the refractive index of the first biconvex lens P1 is n1, the refractive index of the second biconvex lens P2 is n2, and the refractive index of the third meniscus lens P3 is n3, which satisfy the following relation: n1 is more than or equal to 1.50 and less than or equal to 1.55, n2 is more than or equal to 1.5 and less than or equal to 1.55, and n3 is more than or equal to 1.50 and less than or equal to 1.55.