CN116774396B - A five-piece micro mobile phone lens - Google Patents

Abstract

The invention provides a five-lens-type miniature mobile phone lens which comprises five lenses, an aperture diaphragm, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the aperture diaphragm starts from an object space to an image space along an optical axis. The invention designs corresponding structures and corresponding parameters for five lenses, and the camera has small volume, can be suitable for more complex and various scenes, and effectively reduces the system cost; the small head lens is installed in a size so as to be used under various devices and meet the design requirements of clear imaging and relatively small distortion influence.

Description

A five-piece micro mobile phone lens

Technical Field

The present invention relates to the field of optical devices, and more specifically, to a five-piece structure micro mobile phone lens.

Background technique

With the rapid development of mobile phone technology, mobile phone lenses are gradually moving towards miniaturization and smaller head size. While achieving miniaturization and small head size, solving the technical problems of high-definition imaging and depth of view of small head lenses is still an issue that needs to be paid attention to.

Summary of the invention

The present invention aims at the technical problems existing in the prior art and provides a five-piece structure micro-miniature mobile phone lens, comprising an aperture stop, a first lens, a second lens, a third lens, a fourth lens and a fifth lens starting from the object side and along the optical axis to the image side;

The first lens is a positive lens, the object side surface of which is convex near the optical axis, and changes from convex to concave from the near optical axis to the periphery, and the image side surface of which is concave near the optical axis, and changes from concave to convex from the near optical axis to the periphery;

The second lens is a positive lens, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis;

The third lens is a negative lens, whose object side surface is concave and image side surface is convex;

The fourth lens is a negative lens, whose object side surface is concave and image side surface is convex;

The fifth lens is a negative lens, whose object side surface is concave and image side surface is convex.

On the basis of the above technical solution, the present invention can also make the following improvements.

Optionally, the combined focal length of the first lens, the second lens and the third lens is F123, and the total focal length of the lens is EFL, which satisfies:

1.15<F123/EFL<1.3.

Optionally, the combined focal length of the second lens, the third lens and the fourth lens is F234, and the total focal length of the lens is EFL, which satisfies:

0.58<F234//EFL<0.92.

Optionally, the total focal length of the lens is EFL, and the total length of the lens is TTL, which satisfies:

0.78<EFL/TTL<0.83.

Optionally, the focal lengths of the second lens and the third lens are F23, and the total focal length of the lens is EFL, which satisfies:

-5.85<F23/EFL<-2.8.

Optionally, the focal length of the first lens is F1, and the focal lengths of the second lens and the third lens are F23, which satisfy:

-5.72<F23/F1<-3.05.

The present invention provides a five-piece micro-sized mobile phone lens, which includes five lenses. Corresponding structures and corresponding parameters are designed for the five lenses. The camera is small in size and can be applied to more complex and diverse scenes, effectively reducing system costs. The installation size of the small head lens can be used in various devices and meet the design requirements of clear imaging and relatively small distortion effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a five-piece micro-sized mobile phone lens provided by a first embodiment of the present invention;

FIG2 is a schematic diagram of the distortion and field curvature of light at any pupil in any field of view at a wavelength defined by Wave for a five-piece micro-mobile phone lens of the first embodiment;

FIG3 is a schematic diagram showing a comparison between each field of view and the center brightness of the five-lens micro-sized mobile phone lens of the first embodiment;

FIG4 is a schematic diagram of FFT modulation transfer function data of the defocus change of the five-piece structure micro-miniature mobile phone lens at a specified frequency according to the first embodiment;

FIG5 is a schematic diagram of the structure of a five-piece micro-sized mobile phone lens provided by a second embodiment of the present invention;

FIG6 is a schematic diagram of the distortion and field curvature of light at any pupil in any field of view at a wavelength defined by Wave for a five-piece micro-mobile phone lens of the second embodiment;

FIG7 is a schematic diagram showing a comparison between each field of view and the center brightness of the five-lens micro-mobile phone lens of the second embodiment;

FIG8 is a schematic diagram of FFT modulation transfer function data of the defocus variation of the five-piece structure micro-mobile phone lens of the second embodiment at a specified frequency.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention can be arbitrarily combined with each other to form a feasible technical solution. This combination is not restricted by the sequence of steps and/or the structural composition mode, but must be based on the ability of ordinary technicians in this field to achieve it. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

In order to reduce the installation size of the lens, so as to achieve the purpose of making the lens opening on the mobile phone screen or panel as small as possible in appearance, and to meet the purpose of high-definition imaging, smooth distortion without sudden changes, and making the total length of the lens short enough, referring to FIG1 , a five-piece structure micro mobile phone lens according to a first embodiment of the present invention is provided. The mobile phone lens includes five lenses. Starting from the object side, along the optical axis to the image side, the components are arranged in the following order: aperture stop (STOP), first lens (L1), second lens (L2), third lens (L3), first fourth lens (L4) and fifth lens (L5).

Among them, the first lens (L1) is a positive lens, whose object side surface is convex near the optical axis, and there is a change from convex to concave from the near optical axis to the periphery, and whose image side surface is concave near the optical axis, and there is a change from concave to convex from the near optical axis to the periphery. The second lens (L2) is a positive lens, whose object side surface is convex near the optical axis, and whose image side surface is concave near the optical axis. The third lens (L3) is a negative lens, whose object side surface is concave and whose image side surface is convex. The fourth lens (L4) is a negative lens, whose object side surface is concave and whose image side surface is convex. The fifth lens (L5) is a negative lens, whose object side surface is concave and whose image side surface is convex.

The combined focal length of the first lens (L1), the second lens (L2) and the third lens (L3) is F123, the combined focal length of the second lens (L2), the third lens (L3) and the fourth lens (L4) is F234, the total focal length of the lens is EFL, the total length of the lens is TTL, the focal lengths of the second lens (L2) and the third lens (L3) are F23, and the focal length of the first lens (L1) is F1.

Each parameter meets the following conditions:

1.15<F123/EFL<1.3;

0.58<F234//EFL<0.92;

0.78<EFL/TTL<0.83;

-5.85<F23/EFL<-2.8;

-5.72<F23/F1<-3.05.

Among them, the lens data of the five-piece structure micro-miniature mobile phone lens of the first embodiment are shown in Table 1 below.

Table 1

Conditions satisfied by the optical parameters of the first lens to the fifth lens are shown in Table 2.

Table 2

F123/EFL＝ 1.2271 F23/EFL＝ -2.8944 F234/EFL＝ 0.6711 F23/F1＝ -3.1417 EFL/TTL＝ 0.8119

Figure 2 is a schematic diagram of the distortion and field curvature of light at any field of view and any pupil of the five-piece micro-mobile phone lens of the first embodiment at the wavelength defined by Wave. Figure 3 is a schematic diagram of the comparison of each field of view and the central brightness of the five-piece micro-mobile phone lens of the first embodiment. Figure 4 is a schematic diagram of the FFT modulation transfer function data of the defocus change of the five-piece micro-mobile phone lens of the first embodiment at a specified frequency.

Among them, Figure 5 is a structural schematic diagram of the five-piece structure micro mobile phone lens of the second embodiment, and its structure is the same as that of the first embodiment, except that: the conditions satisfied by its lens data, cone coefficients, aspheric coefficients and optical parameters of each lens are different.

Among them, the lens data of the five-piece structure micro-miniature mobile phone lens of the second embodiment are shown in Table 3 below.

table 3

Conditions satisfied by the optical parameters of the first lens to the fifth lens are shown in Table 4.

Table 4

F123/EFL＝ 1.2182 F23/EFL＝ -5.8113 F234/EFL＝ 0.8802 F23/F1＝ -5.6726 EFL/TTL＝ 0.8001

Figure 6 is a schematic diagram of the distortion and field curvature of light at any field of view and any pupil of the five-piece micro-mobile phone lens of the second embodiment at the wavelength defined by Wave. Figure 7 is a schematic diagram of the comparison of each field of view and the central brightness of the five-piece micro-mobile phone lens of the second embodiment. Figure 8 is a schematic diagram of the FFT modulation transfer function data of the defocus change of the five-piece micro-mobile phone lens of the second embodiment at a specified frequency.

The embodiment of the present invention provides a five-piece micro-sized mobile phone lens, with corresponding structures and parameters designed for each lens. The camera is small in size and can be applied to more complex and diverse scenes, effectively reducing system costs. The installation size of the small head lens is small so that it can be used in various devices and meet the design requirements of clear imaging and relatively small distortion effect.

It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (1)

1. A five-piece micro-sized mobile phone lens, characterized in that it includes an aperture stop, a first lens, a second lens, a third lens, a fourth lens and a fifth lens starting from the object side and along the optical axis to the image side; The first lens is a positive lens, the object side surface of which is convex near the optical axis, and changes from convex to concave from the near optical axis to the periphery, and the image side surface of which is concave near the optical axis, and changes from concave to convex from the near optical axis to the periphery; The second lens is a positive lens, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis; The third lens is a negative lens, whose object side surface is concave and image side surface is convex; The fourth lens is a negative lens, whose object side surface is concave and image side surface is convex; The fifth lens is a negative lens, whose object side surface is concave and image side surface is convex; The combined focal length of the first lens, the second lens and the third lens is F123, and the total focal length of the lens is EFL, which satisfies: 1.15<F123/EFL<1.3; The combined focal length of the second lens, the third lens and the fourth lens is F234, and the total focal length of the lens is EFL, which satisfies: 0.58<F234//EFL<0.92; The total focal length of the lens is EFL, and the total length of the lens is TTL, which satisfies: 0.78<EFL/TTL<0.83; The focal lengths of the second lens and the third lens are F23, and the total focal length of the lens is EFL, which satisfies: -5.85<F23/EFL<-2.8; The focal length of the first lens is F1, and the focal lengths of the second lens and the third lens are F23, which satisfy: -5.72<F23/F1<-3.05.