CN217821052U

CN217821052U - High-definition camera lens

Info

Publication number: CN217821052U
Application number: CN202221354573.0U
Authority: CN
Inventors: 林文斌; 许熠宸; 罗杰; 郑新; 江伟
Original assignee: Fujian Forecam Tiantong Optics Co Ltd
Current assignee: Fujian Forecam Tiantong Optics Co Ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-11-15
Anticipated expiration: 2032-06-01

Abstract

The utility model relates to a high definition camera lens, the optical system of the lens comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens which are arranged along the incident light path of light from left to right in sequence; the first lens is a negative meniscus lens, the second lens is a double-convex positive lens, the third lens is a double-convex positive lens, and the fourth lens is a negative meniscus lens. The excellent characteristics of the aspheric surface are fully utilized, and the imaging quality is excellent. F number is less than or equal to 1.60, the overall performance of the system is better, and the picture brightness is better. And a four-piece simple structure is adopted, so that the system is small in size, light in weight and stable in structure. The material collocation is reasonable, and the low chromatic aberration and high image quality design is realized at low cost. The surface type is reasonable in design, low in tolerance sensitivity and suitable for large-scale production.

Description

High-definition camera lens

Technical Field

The utility model relates to a high definition camera lens.

Background

Nowadays, the use scenes of security lenses have been greatly expanded, and for example, the demand of security lenses based on smart home scenes is increasing year by year. However, the common security lens in the market is often complex in structure, too large in size, difficult to maintain and difficult to integrate into the home environment. Therefore, there is a need in the market for a small-sized high-performance optical lens with a relatively simple system structure to meet the needs.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, the utility model aims to solve the technical problem that a high definition camera lens is provided.

In order to solve the technical problem, the technical scheme of the utility model is that: an optical system of the camera lens comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens which are sequentially arranged along a light incident path from left to right; the first lens is a negative meniscus lens, the second lens is a double-convex positive lens, the third lens is a double-convex positive lens, and the fourth lens is a negative meniscus lens.

Preferably, the third lens and the fourth lens of the optical system are bonded to each other to form a cemented lens group.

Preferably, the focal length of the optical system is set to f, and the focal lengths of the first lens, the second lens and the cemented lens group are respectively set to f ₁ 、f ₂ 、f _c Wherein the following ratio with f is satisfied: -1.5<f ₁ /f<-0.1，1.0<f ₂ /f<2.5，1.9<f _c /f<3.1。

Preferably, the first lens satisfies the relation: n is a radical of _d ≥1.5，V _d Not less than 50.0; the second lens satisfies the relation: n is a radical of hydrogen _d ≥1.5，V _d Not less than 50.0; third lens fullThe foot relation: n is a radical of _d ≥1.5，V _d Not less than 50.0; the fourth lens satisfies the relation: n is a radical of hydrogen _d ≥1.5，V _d Less than or equal to 50.0; wherein N is _d Is refractive index, V _d Abbe constant.

Preferably, the F-number of the optical system is less than or equal to 1.60.

Compared with the prior art, the utility model discloses following beneficial effect has: the excellent characteristics of the aspheric surface are fully utilized, and the imaging quality is excellent. F number is less than or equal to 1.60, the overall performance of the system is better, and the picture brightness performance is better. And a four-piece simple structure is adopted, so that the system is small in size, light in weight and stable in structure. The material collocation is reasonable, and the low chromatic aberration and high image quality design is realized at low cost. The surface type is reasonable in design, low in tolerance sensitivity and suitable for large-scale production.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a schematic view of an optical structure according to an embodiment of the present invention;

FIG. 2 is an axial chromatic aberration diagram of the operating band of an embodiment of the present invention;

FIG. 3 is a vertical axis chromatic aberration diagram of the working wavelength band according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating the distortion of the field curvature of the working band according to an embodiment of the present invention;

in the figure: l1-a first lens; l2-a second lens; l3-a third lens; l4-fourth lens; l5-glass plate; STO-stop; IMA-imaging plane.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1 to 4, the present embodiment provides a high definition camera lens, an optical system of the camera lens includes a first lens, a second lens, a diaphragm, a third lens, and a fourth lens, which are sequentially disposed along a light incident path from left to right; the first lens is a negative meniscus lens, the second lens is a double-convex positive lens, the third lens is a double-convex positive lens, and the fourth lens is a negative meniscus lens.

In an embodiment of the present invention, the third lens and the fourth lens of the optical system are bonded to each other to form a cemented lens group.

In an embodiment of the present invention, the focal length of the optical system is set to be f, and the focal lengths of the first lens, the second lens and the cemented lens group are respectively set to be f ₁ 、f ₂ 、f _c Wherein the following ratio with f is satisfied: -1.5<f ₁ /f<-0.1，1.0<f ₂ /f<2.5，1.9<f _c /f<3.1。

In an embodiment of the present invention, the first lens satisfies the following relation: n is a radical of hydrogen _d ≥1.5，V _d Not less than 50.0; the second lens satisfies the relation: n is a radical of _d ≥1.5，V _d Not less than 50.0; the third lens satisfies the relation: n is a radical of _d ≥1.5，V _d Not less than 50.0; the fourth lens satisfies the relation: n is a radical of _d ≥1.5，V _d Less than or equal to 50.0; wherein N is _d Is refractive index, V _d Abbe constant.

The embodiment of the present invention provides an aspheric lens, which is composed of a first lens, a third lens and a fourth lens, wherein the aspheric curve equation expression is:

wherein Z is aspheric edge lightWhen the height in the axial direction is h, the distance from the vertex of the aspheric surface is high; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha is alpha ₁ 、α ₂ 、α ₃ 、α ₄ 、α ₅ 、α ₆ 、α ₇ 、α ₈ Are all high-order term coefficients.

In an embodiment of the present invention, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 5.66.

In the embodiment of the present invention, the F number of the optical system is less than or equal to 1.60.

In the embodiment of the present invention, the half-image height ImaH of the optical system and the focal length f of the optical system satisfy: imaH/f is more than or equal to 0.88.

In the embodiment of the present invention, the technical indexes of the optical system of this embodiment are as follows:

(1) Focal length: EFFL is more than or equal to 3.5mm and less than or equal to 4.5mm; (2) the aperture F is less than or equal to 1.60; (3) working wave band: visible light.

To realize the above design parameters, the specific design adopted by the optical system of this embodiment is as follows:

the aspherical surface coefficients of the aspherical lenses of the optical system of the present embodiment are as follows:

an imaging method of a high-definition camera lens comprises the following steps: the light rays sequentially pass through the first lens, the second lens, the diaphragm, the third lens and the fourth lens from left to right and then are imaged.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a high definition camera lens which characterized in that: the optical system of the lens comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens which are sequentially arranged from left to right along a light incident light path; the first lens is a negative meniscus lens, the second lens is a double-convex positive lens, the third lens is a double-convex positive lens, and the fourth lens is a negative meniscus lens.

2. The high-definition imaging lens according to claim 1, characterized in that: the third lens and the fourth lens of the optical system are mutually bonded into a cemented lens group.

3. The high-definition imaging lens according to claim 2, characterized in that: setting the focal length of the optical system as f, and the focal lengths of the first lens, the second lens and the cemented lens group as f ₁ 、f ₂ 、f _c Wherein the following ratio with f is satisfied: -1.5 < f ₁ /f＜-0.1，1.0＜f ₂ /f＜2.5，1.9＜f _c /f＜3.1。

4. The high-definition imaging lens according to claim 1, characterized in that: the first lens satisfies the relation: n is a radical of hydrogen _d ≥1.5，V _d Not less than 50.0; the second lens satisfies the relation: n is a radical of hydrogen _d ≥1.5，V _d Not less than 50.0; the third lens satisfies the relation: n is a radical of _d ≥1.5，V _d Not less than 50.0; the fourth lens satisfies the relation: n is a radical of hydrogen _d ≥1.5，V _d Less than or equal to 50.0; wherein N is _d Is a refractive index, V _d Abbe constant.

5. The high-definition imaging lens according to claim 1, characterized in that: the F number of the optical system is less than or equal to 1.60.