CN113391431A

CN113391431A - Optical system, image capturing module with same and electronic device

Info

Publication number: CN113391431A
Application number: CN202110578252.2A
Authority: CN
Inventors: 杨健; 华露; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-09-14
Anticipated expiration: 2041-05-26
Also published as: CN113391431B

Abstract

The invention discloses an optical system, an image capturing module with the optical system and an electronic device with the optical system, wherein the optical system comprises: a first lens element with positive optical power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a second lens element with positive optical power having a concave object-side surface at paraxial region and a convex image-side surface at paraxial region; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens element with positive optical power having a convex image-side surface at paraxial region; a seventh lens element having a negative optical power, the image-side surface of which is concave at the paraxial region. The optical system is light and thin, and can obtain a large imaging range.

Description

Optical system, image capturing module with same and electronic device

Technical Field

The invention relates to the technical field of optical imaging, in particular to an optical system, an image capturing module with the optical system and an electronic device with the optical system.

Background

With the progress of science and technology, electronic products such as smart phones, tablet computers, telephone watches and the like are rapidly popularized due to the characteristic of portability. Optical imaging lenses used in portable electronic products have high requirements not only for miniaturization, but also for imaging quality. For example, the optical imaging lens currently used in mainstream mobile phones is generally configured as a combined lens including a large image plane lens, a wide-angle lens and a telephoto lens to achieve different photographing effects and meet various requirements of portable electronic products.

Therefore, how to make an optical imaging lens applied to a portable electronic product obtain a clearer imaging picture while taking a good account of a shooting range is an urgent problem to be solved at present

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the present invention to propose an optical system having a large viewing angle and a small size.

The optical system according to the embodiment of the present invention includes, in order from an object side to an image side along an optical axis: a first lens element with positive optical power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a second lens element with positive optical power having a concave object-side surface at paraxial region and a convex image-side surface at paraxial region; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens element with positive optical power having a convex image-side surface at paraxial region; a seventh lens element having a negative optical power, the image-side surface of which is concave at the paraxial region.

In the optical system, the first lens and the second lens have stronger positive focal power, which is beneficial to the convergence of light, thereby shortening the total length of the optical system and realizing the miniaturization design; in addition, the first lens element has an object-side surface and an image-side surface, the object-side surface of the first lens element is convex at a paraxial region, and the image-side surface of the first lens element is concave at a paraxial region, so that the positive power intensity of the first lens element can be properly adjusted, which contributes to shortening the total length of the optical system; the second lens element has an object-side surface and an image-side surface, wherein the object-side surface of the second lens element is concave at a paraxial region thereof, and the image-side surface of the second lens element is convex at a paraxial region thereof, thereby better correcting aberration; the sixth lens has positive focal power, and the image side surface of the sixth lens at the position close to the optical axis is a convex surface, so that stronger positive refractive power can be generated, light rays can be converged, and the total length of the optical system can be further shortened; the seventh lens has negative focal power, and the image side surface of the seventh lens is concave at a paraxial region, so that back focus can be easily ensured, and aberration can be well corrected.

In one example, the optical system satisfies the following relationship: (sd71-sd21)/TTL >0.2, sd71 is half of the maximum effective half caliber of the object side surface of the seventh lens, sd21 is half of the maximum effective half caliber of the object side surface of the second lens, and TTL is the distance between the object side surface of the first lens and the image plane on the optical axis.

Satisfying the above formula, when the total length is constant, the aperture of the seventh lens is increased and the aperture of the second lens is decreased as much as possible, which is beneficial to decreasing the length of the front section of the optical system, realizing the miniaturization of the front end, and being beneficial to enlarging the field angle of the optical system; when the aperture difference between the seventh lens and the second lens is constant, the total length is reduced as much as possible, and the longitudinal dimension of the optical system is reduced; in a word, the formula is satisfied, so that the optical system is lighter and thinner and a larger imaging range is obtained.

In one example, the optical system satisfies the following relationship: TTL/ImgH < 1.5; wherein ImgH is half of the diagonal of the effective imaging area.

The optical system has the advantages that the relation is met, the ratio of the distance from the object side surface of the first lens to the imaging surface to the effective imaging length of the diagonal line on the imaging surface is reasonably configured, the total length of the optical system is effectively reduced, the optical system is beneficial to having a compact structure, the sensitivity of the optical system is reduced, and the optical system has an image surface large enough to shoot more details of an object.

In one example, the optical system satisfies the following relationship: 0.6< (et12+ et67)/(ct12+ ct67) < 1.8; wherein et12 is the distance on the optical axis from the maximum effective semi-aperture of the image side surface of the first lens to the maximum effective semi-aperture of the object side surface of the second lens; et67 is the distance on the optical axis from the maximum effective half aperture of the object side surface of the seventh lens to the maximum effective half aperture of the image side surface of the sixth lens; ct12 is the distance from the intersection point of the image side surface of the first lens and the optical axis to the intersection point of the object side surface of the second lens and the optical axis; ct67 is the distance from the intersection point of the image-side surface and the optical axis of the sixth lens element to the intersection point of the object-side surface and the optical axis of the seventh lens element.

Satisfying above-mentioned relational expression, both having been favorable to realizing that optical system front end is miniaturized, reducing optical system volume, for carrying on optical system's electron device saves space, improves optical system competitiveness, is favorable to marginal visual field light reasonable transition again, improves when realizing big image plane optical system's imaging quality.

In one example, the optical system satisfies the following relationship: 13< f1/(ct1-et1) < 18; wherein f1 is the first lens effective focal length; ct1 is the distance from the intersection point of the object side surface and the optical axis of the first lens to the intersection point of the image side surface and the optical axis of the first lens, namely the intermediate thickness of the first lens; et1 is the distance in the optical axis direction from the maximum effective half aperture on the object side of the first lens to the maximum effective half aperture on the image side of the first lens, i.e. the first lens edge thickness.

The thickness difference value of the first lens is ensured, the first lens is favorably formed, the reasonable distribution of focal power and the uniform transition of light rays are favorably realized, and the sensitivity of an optical system is reduced.

In one example, the optical system satisfies the following relationship: 1< f2/(r22-r21) < 3.5; wherein f2 is the second lens effective focal length; r22 is the image side radius of curvature of the second lens; r21 is the radius of curvature of the object side of the second lens.

The optical system meets the relationship, the curvature radiuses of the object side surface and the image side surface of the second lens are effectively restrained through reasonable configuration of the effective focal length of the second lens, the curvature radius of the image side surface of the second lens and the curvature radius of the object side surface of the second lens, and appropriate positive focal power is provided for the optical system, so that the second lens obtains enough optical convergence capacity, stray light generated by the first lens can be eliminated, chromatic aberration can be corrected, balance of various aberrations of the system can be promoted, and good imaging quality can be obtained.

In one example, the optical system satisfies the following relationship: 7.5< ct26/at26< 10; wherein ct26 is the distance from the intersection point of the object-side surface of the second lens element and the optical axis to the intersection point of the image-side surface of the sixth lens element and the optical axis; at26 is the sum of the air spaces on the optical axis between the second lens and the sixth lens.

Satisfying the above relation, by controlling the ratio between the distance from the intersection point of the object side surface of the second lens and the optical axis to the intersection point of the image side surface of the sixth lens and the optical axis to the sum of the air intervals on the optical axis between the second lens and the sixth lens, the total length of the optical system is favorably shortened, and the miniaturization of the optical system is realized. In addition, the reasonable air gap of the lens can also avoid the difficulty of the processing technology caused by the over-thin lens.

In one example, the optical system satisfies the following relationship: 0.9< sag62/(sag71+ sag72) < 2.4; wherein sag62 is the rise of the image-side surface of the sixth lens, sag71 is the rise of the object-side surface of the seventh lens, and sag72 is the rise of the image-side surface of the seventh lens.

The surface type of the seventh lens is favorably restrained effectively, the seventh lens is matched with the sixth lens, the light rays in the edge field of view have a smaller deflection angle, so that the relative brightness of the edge field of view of the optical system is improved, meanwhile, the seventh lens is prevented from being bent too much, and the machinability of the seventh lens is improved.

In one example, the optical system satisfies the following relationship: -9< f3/f < -2; wherein f3 is the effective focal length of the third lens; f is the effective focal length of the optical system.

The third lens element can be matched with the front lens element and the rear lens element to achieve a better aberration correction effect, so as to ensure good imaging quality.

The invention further provides an image capturing module with the optical system of the embodiment.

According to the image capturing module of the embodiment of the invention, the image capturing module comprises: the image pickup device includes an optical system and a light-receiving element disposed on an image side of the optical system.

According to the image capturing module provided by the embodiment of the invention, the first lens to the seventh lens of the optical system are arranged in the lens module, and the surface types and the focal powers of the first lens to the seventh lens are reasonably configured, so that the image capturing module can meet the requirement of miniaturization, and the image capturing module can obtain a larger imaging range.

The invention also provides an electronic device with the optical system of the embodiment.

The electronic device according to the embodiment of the invention comprises a shell and an image capturing module, wherein the image capturing module is arranged on the shell. The electronic device can be a smart phone, a Personal Digital Assistant (PDA), a tablet computer, a smart watch, an unmanned aerial vehicle, an electronic book reader, a vehicle event data recorder, a wearable device and the like.

According to the electronic device provided by the embodiment of the invention, the image capturing module is arranged in the shell, so that the electronic device can meet the requirement of miniaturization, and the electronic device can obtain a larger imaging range.

Additional aspects and advantages of the invention according to embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an optical system according to a first embodiment of the present application.

Fig. 2 is a graph of spherical aberration, astigmatism and distortion of an optical system in a first embodiment of the present application.

Fig. 3 is a schematic structural diagram of an optical system in a second embodiment of the present application.

Fig. 4 is a graph of spherical aberration, astigmatism and distortion of an optical system in a second embodiment of the present application.

Fig. 5 is a schematic structural diagram of an optical system in a third embodiment of the present application.

Fig. 6 is a graph of spherical aberration, astigmatism and distortion of an optical system in a third embodiment of the present application.

Fig. 7 is a schematic structural diagram of an optical system in a fourth embodiment of the present application.

Fig. 8 is a graph of spherical aberration, astigmatism and distortion of an optical system in a fourth embodiment of the present application.

Fig. 9 is a schematic structural diagram of an optical system in a fifth embodiment of the present application.

Fig. 10 is a graph of spherical aberration, astigmatism and distortion of an optical system in a fifth embodiment of the present application.

Fig. 11 is a schematic structural diagram of an optical system in a sixth embodiment of the present application.

Fig. 12 is a graph showing spherical aberration, astigmatism and distortion of an optical system in a sixth embodiment of the present application.

Fig. 13 is a schematic structural diagram of an image capturing module according to an embodiment of the present application.

Fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Reference numerals:

an electronic device 1000; an image capturing module 100; an optical system 10;

a first lens L1; a second lens L2; a third lens L3; a fourth lens L4; a fifth lens L5; a sixth lens L6; a seventh lens L7;

object sides S2, S5, S7, S9, S11, S13, S15, S17;

like sides S3, S6, S8, S10, S12, S14, S16, S18;

a diaphragm STO; the image forming surface S19; an optical filter 110; an optical axis 101;

a photosensitive element 20;

a housing 200.

Detailed Description

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

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

An optical system 10 according to an embodiment of the present invention is described below with reference to fig. 1-12.

As shown in fig. 1, the optical system 10 according to the embodiment of the present invention includes, in order from the object side to the image side along the optical axis 101, a first lens L1 having positive power, a second lens L2 having positive power, a third lens L3 having negative power, a fourth lens L4 having power, a fifth lens L5 having power, a sixth lens L6 having positive power, and a seventh lens L7 having negative power.

In the optical system 10, the first lens L1 and the second lens L2 have strong positive focal power, which is beneficial to the convergence of light rays, thereby shortening the total length of the optical system 10 and realizing the miniaturization design; in addition, the first lens element L1 has an object-side surface S2 and an image-side surface S3, the object-side surface S2 of the first lens element L1 is convex at the paraxial region 101, and the image-side surface S3 of the first lens element L1 is concave at the paraxial region 101, so that the positive power intensity of the first lens element L1 can be properly adjusted to help shorten the overall length of the optical system 10; the second lens element L2 has an object-side surface S5 and an image-side surface S6, the object-side surface S5 of the second lens element L2 is concave at the paraxial region 101, and the image-side surface S6 of the second lens element L2 is convex at the paraxial region 101, so that aberrations can be corrected well; the sixth lens L6 has positive refractive power, and the image-side surface S14 of the sixth lens L6 is convex at the position near the optical axis 101, so as to generate strong positive refractive power, converge light rays, and further shorten the total length of the optical system 10; the seventh lens element L7 has negative power, and the image-side surface S16 of the seventh lens element L7 is concave at the paraxial region 101, so that a back focus can be easily secured and aberrations can be well corrected.

Further, the optical system 10 satisfies the following relation: (sd71-sd21)/TTL >0.2,

wherein sd71 is half of the maximum effective half-aperture of the object-side surface S15 of the seventh lens L7, sd21 is half of the maximum effective half-aperture of the object-side surface S5 of the second lens L2, and TTL is the distance on the optical axis from the object-side surface S2 of the first lens L1 to the image plane S19.

Satisfying the above equation, when the total length is constant, increasing the aperture of the seventh lens L7 and decreasing the aperture of the second lens L2 as much as possible is advantageous for decreasing the front-end length of the optical system 10, realizing miniaturization of the front end, and expanding the angle of view of the optical system 10; when the aperture difference between the seventh lens L7 and the second lens L2 is constant, the total length is reduced as much as possible, and the longitudinal dimension of the optical system 10 is reduced; in summary, satisfying the above formula is advantageous for making the optical system 10 thinner and lighter and obtaining a larger imaging range. In addition, for comparison, when (sd71-sd21)/TTL is less than or equal to 0.2, the total length of the optical system 10 becomes large, and the difference between the maximum effective half-diameter of the object-side surface S5 of the second lens L2 and the maximum effective half-diameter of the object-side surface S15 of the seventh lens L7 becomes small, which is disadvantageous for shortening the total length of the optical system 10 and downsizing of the front end of the optical system 10.

The optical system 10 satisfies the following relation: TTL/ImgH < 1.5;

wherein ImgH is half of the diagonal of the effective imaging area.

Satisfying the above relationship, the distance from the object-side surface S2 of the first lens L1 to the imaging surface S19 and the effective imaging length of the diagonal line on the imaging surface S19 are reasonably arranged, so that the total length of the optical system 10 is effectively reduced, the optical system 10 has a compact structure, the sensitivity of the optical system 10 is reduced, and the image plane is large enough to photograph more details of the object.

The optical system 10 satisfies the following relation: 0.6< (et12+ et67)/(ct12+ ct67) < 1.8;

wherein et12 is the distance on the optical axis 101 from the maximum effective half aperture of the object-side surface S5 of the second lens L2 at the maximum effective half aperture of the image-side surface S3 of the first lens L1; et67 is the distance on the optical axis 101 from the maximum effective half aperture of the object-side surface S15 of the seventh lens L7 at the maximum effective half aperture of the image-side surface S14 of the sixth lens L6; ct12 is the distance from the intersection of the image-side surface S3 of the first lens L1 and the optical axis 101 to the intersection of the object-side surface S5 of the second lens L2 and the optical axis 101; ct67 is the distance from the intersection of the image-side surface S14 of the sixth lens L6 and the optical axis 101 to the intersection of the object-side surface S16 of the seventh lens L7 and the optical axis 101.

Satisfying the above relation, not only being favorable to realizing that optical system 10 front end is miniaturized, reducing optical system 10 volume, for carrying on optical system 10's electron device saves space, improves optical system 10 competitiveness, is favorable to marginal visual field light reasonable transition again, improves when realizing big image plane optical system 10's imaging quality.

The optical system 10 satisfies the following relation: 13< f1/(ct1-et1) < 18;

wherein f1 is the effective focal length of the first lens L1; ct1 is the distance from the intersection point of the object-side surface S2 of the first lens L1 and the optical axis 101 to the intersection point of the image-side surface S3 of the first lens L1 and the optical axis 101, i.e., the thickness of the first lens L1; et1 is the distance in the direction of the optical axis 101 from the maximum effective half aperture of the object-side surface S2 of the first lens L1 to the maximum effective half aperture of the image-side surface S3 of the first lens L1, i.e., the side thickness of the first lens L1.

Satisfying the above relationship, the thickness difference of the first lens L1 is ensured, which is beneficial to the molding of the first lens L1, and also beneficial to the reasonable distribution of the focal power and the uniform transition of the light, and the sensitivity of the optical system 10 is reduced. When f1/(ct-et) is less than or equal to 13, the difference between the middle thickness and the edge thickness of the first lens L1 is too large, the surface is too curved, and the difficulty of lens molding is increased; when f1/(ct-et) ≧ 18, the positive refractive power provided by the first lens element L1 is insufficient, which is detrimental to correcting the spherical aberration of the system and degrades the imaging quality of the optical system 10.

The optical system 10 satisfies the following relation: 1< f2/(r22-r21) < 3.5;

wherein f2 is the effective focal length of the second lens L2; r22 is the radius of curvature of the image-side surface S6 of the second lens L2; r21 is the radius of curvature of the object-side surface S5 of the second lens L2.

The above relationship is satisfied, and by reasonably configuring the effective focal length of the second lens L2, the curvature radius of the image-side surface S6 of the second lens L2, and the curvature radius of the object-side surface S5 of the second lens L2, the curvature radii of the object-side surface S5 and the image-side surface S6 of the second lens L2 are effectively constrained, so as to provide a proper positive focal power for the optical system 10, so that the second lens L2 obtains a sufficient optical convergence capability, which is beneficial to eliminating stray light generated by the first lens L1, correcting chromatic aberration, and promoting the balance of various aberrations of the system, so as to obtain good imaging quality.

The optical system 10 satisfies the following relation: 7.5< ct26/at26< 10;

wherein ct26 is the distance from the intersection point of the object-side surface S5 of the second lens L2 and the optical axis 101 to the intersection point of the image-side surface S14 of the sixth lens L6 and the optical axis 101; at26 is the sum of the air spaces on the optical axis 101 between the second lens L2 and the sixth lens L6.

Satisfying the above relationship, by controlling the ratio between the distance from the intersection point of the object-side surface S5 of the second lens L2 and the optical axis 101 to the intersection point of the image-side surface S15 of the sixth lens L6 and the optical axis 101 and the total sum of the air intervals on the optical axis 101 between the second lens L2 and the sixth lens L6, the total length of the optical system 10 can be shortened, and the optical system 10 can be miniaturized. In addition, the reasonable air gap of the lens can also avoid the difficulty of the processing technology caused by the over-thin lens. When ct26/at26 is greater than or equal to 10, the air gap is too small, which easily causes the interference problem of the front and rear lenses and also increases the processing and assembling difficulty of the lenses; when ct26/at26 is less than or equal to 7.5, it is not favorable for the compact development of the optical system 10 and the ultra-thin development of the optical system 10, and is also not favorable for slowing down the light deflection, adjusting the field curvature and reducing the sensitivity.

The optical system 10 satisfies the following relation: 0.9< sag62/(sag71+ sag72) < 2.4;

wherein sag62 is the sagittal height of the image-side surface S14 of the sixth lens L6, i.e., the horizontal displacement amount by which the intersection point of the image-side surface S14 of the sixth lens L6 on the optical axis 101 to the maximum effective radius position of the image-side surface S14 of the sixth lens L6 on the optical axis 101, and sag71 is the horizontal displacement amount by which the sagittal height of the object-side surface S15 of the seventh lens L7, i.e., the intersection point of the object-side surface S15 of the seventh lens L7 on the optical axis 101 to the maximum effective radius position of the object-side surface S15 of the seventh lens L7 on the optical axis 101 is; sag72 is the sagittal height of the image-side surface S16 of the seventh lens L7, i.e., the horizontal displacement amount from the intersection point of the image-side surface S16 of the seventh lens L7 on the optical axis 101 to the maximum effective radius position of the image-side surface S16 of the seventh lens L7 on the optical axis 101.

Satisfying the above relationship is beneficial to effectively constraining the surface shape of the seventh lens L7, and in cooperation with the sixth lens L6, ensuring that the marginal field light has a smaller deflection angle, so as to improve the relative brightness of the marginal field of the optical system 10, and at the same time, avoiding the seventh lens L7 from being too curved, and improving the processability of the seventh lens L7. When sag62/(sag71+ sag72) is less than or equal to 0.9, the sagittal height of the object-side image side of the seventh lens L7 is too large, the surface is too curved, the sensitivity is increased, and the lens is not favorable for processing and molding; when sag62/(sag71+ sag72) ≥ 2.4, the curvature of the object-side surface and the image-side surface of the seventh lens L7 is insufficient, which is not favorable for correcting the spherical aberration and the aberration of the field curvature of the system, and cannot ensure the imaging quality of the optical system 10.

The optical system 10 satisfies the following relation: -9< f3/f < -2;

wherein f3 is the effective focal length of the third lens L3; f is the effective focal length of the optical system 10.

Satisfying the above relationship, the aberration correction capability of the optical system 10 is improved by controlling the contribution of the third lens element L3 to the total refractive power of the optical system 10, and meanwhile, the third lens element L3 can be matched with the front and rear lens elements to achieve a better aberration correction effect, so as to ensure that a good imaging quality is obtained; in addition, the total length of the system is also favorably shortened. When f3/f is not less than-2, the negative refractive power of the third lens element L3 is easily over-concentrated, the overall aberration balance is damaged, and the imaging quality is reduced; when f3/f is less than or equal to-9, the light divergence capacity of the third lens L3 is weakened, so that the deflection angle is too large when light propagates between the rear lenses, and smooth and uniform transition of the light is not facilitated.

In one example, at least one of the object side surface S15 of the seventh lens L7 and the image side surface S16 of the seventh lens L7 is provided with at least one inflection point. Therefore, the seventh lens L7 is provided with the inflection point, which is beneficial to correcting off-axis aberration, and can effectively suppress the angle of the light beam incident on the photosensitive element from the off-axis field, so that the incident light beam can be effectively transmitted to the pixel unit of the photosensitive element, and the photosensitive performance of the pixel unit at the edge position of the photosensitive element is improved, and the resolution of the picture is improved.

In some embodiments, at least one lens of optical system 10 has an aspheric surface, which may be referred to as having an aspheric surface when at least one of the lens' surfaces (object-side or image-side) is aspheric. In one embodiment, both the object-side surface and the image-side surface of each lens can be designed to be aspheric. The aspheric design can help the optical system 10 to eliminate aberration more effectively, improving imaging quality. In some embodiments, at least one lens of the optical system 10 may have a spherical surface shape, and the design of the spherical surface shape may reduce the difficulty and cost of manufacturing the lens. In some embodiments, the design of each lens surface in the optical system 10 may be configured by aspheric and spherical surface types for consideration of manufacturing cost, manufacturing difficulty, imaging quality, assembly difficulty, etc. It should be noted that when the object-side or image-side surface of a lens is aspheric, there can be inflection structures in the surface, where the type of surface from center to edge changes, such as a convex surface near the optical axis 101 and a concave surface near the maximum effective aperture.

The surface shape of the aspheric surface can be calculated by referring to an aspheric surface formula:

wherein Z is a distance from a corresponding point on the aspheric surface to a tangent plane of the aspheric surface at the optical axis 101, r is a distance from the corresponding point on the aspheric surface to the optical axis 101, c is a curvature of the aspheric surface at the optical axis 101, k is a conic coefficient, and Ai is a high-order term coefficient corresponding to the ith-order high-order term in the aspheric surface type formula.

On the other hand, in some embodiments, the material of at least one lens in the optical system 10 is Plastic (Plastic), and the Plastic material may be polycarbonate, gum, or the like. In some embodiments, at least one lens of the optical system 10 is made of Glass (Glass). The lens made of plastic can reduce the production cost of the optical system 10, and the lens made of glass can endure higher or lower temperature and has excellent optical effect and better stability. In some embodiments, lenses of different materials may be disposed in the optical system 10, that is, a design combining a glass lens and a plastic lens may be adopted, but the specific configuration relationship may be determined according to practical requirements and is not exhaustive here.

In a first specific embodiment of the present application, the optical system 10 of the first embodiment, in order from an object side to an image side along the optical axis 101, comprises: a first lens L1 having positive power, a second lens L2 having positive power, a third lens L3 having negative power, a fourth lens L4 having negative power, a fifth lens L5 having positive power, a sixth lens L6 having positive power, and a seventh lens L7 having negative power.

Wherein an object side surface S2 of the first lens L1 is convex at the paraxial region 101, an image side surface S3 of the first lens L1 is concave at the paraxial region 101, an object side surface S5 of the second lens L2 is concave at the paraxial region 101, an image side surface S6 of the second lens L2 is convex at the paraxial region 101, an object side surface S7 of the third lens L3 is concave at the paraxial region 101, an image side surface S8 of the third lens L3 is concave at the paraxial region 101, an object side surface S9 of the fourth lens L4 is convex at the paraxial region 101, an image side surface S10 of the fourth lens L4 is concave at the paraxial region 101, an object side surface S11 of the fifth lens L5 is concave at the paraxial region 101, a side surface S867 of the fifth lens L5 is convex at the paraxial region 101, a sixth lens L8672 is convex at the paraxial region 13, a lateral surface S13 of the second lens L13 is convex at the paraxial region 101, the image-side surface S16 of the seventh lens L7 is concave at the paraxial region 101.

An object side surface S2 of the first lens L1 is convex at the circumference, an image side surface S3 of the first lens L1 is concave at the circumference, an object side surface S5 of the second lens L2 is concave at the circumference, an image side surface S6 of the second lens L2 is concave at the circumference, an object side surface S7 of the third lens L3 is convex at the circumference, an image side surface S8 of the third lens L3 is concave at the circumference, an object side surface S9 of the fourth lens L4 is convex at the circumference, an image side surface S10 of the fourth lens L4 is concave at the circumference, an object side surface S10 of the fifth lens L10 is convex at the circumference, an image side surface S10 of the fifth lens L10 is concave at the circumference, an object side surface S10 of the sixth lens L10 is convex at the circumference, an image side surface S10 of the sixth lens L10 is convex at the circumference, a seventh image side surface S10 of the seventh lens L10 is convex at the circumference.

The optical system 10 in the first embodiment satisfies the conditions of table 1. The elements of the optical system 10 from the object side to the image side are arranged in the order from top to bottom according to table 1, wherein the stop STO represents an aperture stop. The filter 110 may be part of the optical system 10 or may be removed from the optical system 10, but the total optical length TTL of the optical system 10 remains unchanged after the filter 110 is removed. The filter 110 may be an infrared cut filter 110. The Y radius in table 1 is the radius of curvature of the corresponding surface of the lens at the optical axis 101. The first value of the lens in the "thickness" parameter column is the thickness of the lens on the optical axis 101, and the second value is the distance from the image-side surface of the lens to the next optical element (lens or stop STO) on the optical axis 101, wherein the thickness parameter of the stop STO indicates the distance from the stop STO surface to the object-side surface of the adjacent lens on the image side on the optical axis 101. The reference wavelength of the refractive index and abbe number of each lens in the table is 587.56nm, the reference wavelength of the focal length (effective focal length) is 555nm, and the numerical units of the Y radius, thickness, and focal length (effective focal length) are all millimeters (mm). In addition, the parameter data and the lens surface shape structure used for the relational expression calculation in the following embodiments are subject to the data in the lens parameter table in the corresponding embodiment.

In the following table, surface number 1 is an object surface, and

surface numbers

2 and 3 are an object side surface S2 and an image side surface S3 of the first lens L1, respectively, that is, in the same lens, a surface with a smaller surface number is an object side surface, and a surface with a larger surface number is an image side surface, which is not described herein again. Meanwhile, the lenses in other embodiments of the present application are also denoted by this, and are not described in detail below.

TABLE 1

It should be noted that f is the effective focal length of the optical system 10, FNO is the f-number of the optical system 10, FOV is the maximum field angle of the optical system 10, and TTL is the distance from the object-side surface S2 of the first lens L1 to the imaging surface S19 of the optical system 10 on the optical axis 101.

In this embodiment, the object-side surface and the image-side surface of each of the seven lenses are aspheric surfaces, and the conic constant K and aspheric coefficients corresponding to the aspheric surfaces are shown in table 2:

TABLE 2

Number of noodles

2

3

5

6

7

8

9

K

-1.036E+01

-3.663E+01

-1.656E+01

-5.924E+01

-6.031E+01

-2.615E+01

-4.584E+01

A4

2.808E-01

7.690E-02

-4.106E-02

-3.655E-01

-2.551E-01

-6.920E-02

-1.804E-01

A6

-3.235E-01

-1.070E-01

4.039E-03

3.976E-01

1.039E-01

1.973E-01

6.190E-01

A8

4.171E-01

2.719E-01

-8.854E-02

3.869E-01

5.293E-01

-6.252E-01

-1.579E+00

A10

-3.700E-01

-5.792E-01

2.283E-01

-2.575E+00

-2.071E+00

9.849E-01

2.504E+00

A12

2.106E-01

7.621E-01

-3.154E-01

4.319E+00

3.196E+00

-9.060E-01

-2.565E+00

A14

-6.321E-02

-5.576E-01

1.601E-01

-3.413E+00

-2.663E+00

4.262E-01

1.660E+00

A16

6.685E-03

1.706E-01

0.000E+00

1.089E+00

-5.424E-02

-6.502E-01

A18

0.000E+00

-1.322E-01

-2.389E-02

1.407E-01

A20

0.000E+00

6.389E-03

-1.292E-02

Number of noodles

10

11

12

13

14

15

16

K

-4.615E+01

1.185E+00

-3.561E+00

5.340E-01

-5.276E+00

-1.215E+01

-5.208E+00

A4

-1.648E-01

-2.739E-02

3.834E-02

3.011E-02

-1.572E-01

-2.979E-01

-1.132E-01

A6

2.863E-01

5.291E-03

-1.153E-01

-1.217E-01

1.454E-01

2.469E-01

7.494E-02

A8

-4.841E-01

-5.075E-03

6.662E-02

7.865E-02

-1.292E-01

-1.649E-01

-3.541E-02

A10

5.383E-01

-6.412E-02

-1.850E-02

-2.485E-02

8.645E-02

8.602E-02

1.138E-02

A12

-3.939E-01

1.254E-01

2.931E-03

4.557E-03

-3.928E-02

-3.217E-02

-2.461E-03

A14

1.966E-01

-9.631E-02

-2.794E-04

-5.090E-04

1.262E-02

8.086E-03

3.499E-04

A16

-6.673E-02

3.795E-02

1.589E-05

3.420E-05

-2.728E-03

-1.277E-03

-3.130E-05

A18

1.404E-02

-7.667E-03

-4.974E-07

-1.272E-06

3.428E-04

1.135E-04

1.597E-06

A20

-1.357E-03

6.307E-04

6.603E-09

2.015E-08

-1.845E-05

-4.325E-06

-3.542E-08

Further, referring to fig. 2(a), fig. 2(a) shows a longitudinal spherical aberration chart of the optical system 10 in the first embodiment at wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, 435 nm. In fig. 2(a), the abscissa represents the focus offset and the ordinate represents the normalized field of view. As can be seen from fig. 2(a), the spherical aberration value of the optical system 10 in the first embodiment is better, which illustrates that the imaging quality of the optical system 10 in this embodiment is better.

Referring to fig. 2(B), fig. 2(B) is a diagram of astigmatism of light of the optical system 10 in the first embodiment at a wavelength of 555 nm. Wherein the abscissa represents the focus offset and the ordinate represents the image height in mm. The astigmatism curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S. As can be seen from fig. 2(B), astigmatism of the optical system 10 in the present embodiment is well compensated.

Referring to fig. 2(C), fig. 2(C) is a graph of distortion of the optical system 10 in the first embodiment at a wavelength of 555 nm. Wherein the abscissa represents distortion and the ordinate represents image height in mm. As can be seen from fig. 2(C), the distortion of the optical system 10 in the present embodiment is well corrected at a wavelength of 555 nm.

As can be seen from fig. 2(a), 2(B), and 2(C), the optical system 10 in this embodiment has small aberration, good imaging quality, and excellent imaging quality.

In a second specific embodiment of the present application, referring to fig. 3 to 4, an optical system 10 of the second embodiment includes, in order from an object side to an image side along an optical axis 101: a first lens L1 having positive power, a second lens L2 having positive power, a third lens L3 having negative power, a fourth lens L4 having negative power, a fifth lens L5 having negative power, a sixth lens L6 having positive power, and a seventh lens L7 having negative power.

Wherein an object side surface S2 of the first lens L1 is convex at the paraxial region 101, an image side surface S3 of the first lens L1 is concave at the paraxial region 101, an object side surface S5 of the second lens L2 is concave at the paraxial region 101, an image side surface S6 of the second lens L2 is convex at the paraxial region 101, an object side surface S7 of the third lens L3 is concave at the paraxial region 101, an image side surface S8 of the third lens L3 is convex at the paraxial region 101, an object side surface S9 of the fourth lens L4 is concave at the paraxial region 101, an image side surface S10 of the fourth lens L4 is concave at the paraxial region 101, an object side surface S11 of the fifth lens L5 is concave at the paraxial region 101, a side surface S867 of the fifth lens L5 is convex at the paraxial region 101, a sixth lens L8672 is convex at the paraxial region 13, a lateral surface S13 of the second lens L13 is convex at the paraxial region 101, the image-side surface S16 of the seventh lens L7 is concave at the paraxial region 101.

An object side surface S2 of the first lens L1 is convex at the circumference, an image side surface S3 of the first lens L1 is concave at the circumference, an object side surface S5 of the second lens L2 is concave at the circumference, an image side surface S6 of the second lens L2 is concave at the circumference, an object side surface S7 of the third lens L3 is convex at the circumference, an image side surface S8 of the third lens L3 is concave at the circumference, an object side surface S9 of the fourth lens L4 is concave at the circumference, an image side surface S10 of the fourth lens L4 is convex at the circumference, an object side surface S10 of the fifth lens L10 is concave at the circumference, an image side surface S10 of the fifth lens L10 is concave at the circumference, an object side surface S10 of the sixth lens L10 is convex at the circumference, an image side surface S10 of the sixth lens L10 is concave at the circumference, a seventh image side surface S10 of the seventh lens L10 is convex at the circumference.

The lens parameters of the optical system 10 in the second embodiment are shown in tables 3 and 4, wherein the names of the elements and the definitions of the parameters can be obtained from the first embodiment, which are not repeated herein.

TABLE 3

In this embodiment, the object-side surface and the image-side surface of each of the seven lenses are aspheric surfaces, and the conic constant K and aspheric coefficients corresponding to the aspheric surfaces are shown in table 4:

TABLE 4

In addition, as can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

In a third embodiment of the present invention, referring to fig. 5-6, an optical system 10 according to the third embodiment includes, in order from an object side to an image side along an optical axis 101: a first lens L1 having positive power, a second lens L2 having positive power, a third lens L3 having negative power, a fourth lens L4 having negative power, a fifth lens L5 having negative power, a sixth lens L6 having positive power, and a seventh lens L7 having negative power.

Wherein an object side surface S2 of the first lens L1 is convex at the paraxial region 101, an image side surface S3 of the first lens L1 is concave at the paraxial region 101, an object side surface S5 of the second lens L2 is concave at the paraxial region 101, an image side surface S6 of the second lens L2 is convex at the paraxial region 101, an object side surface S7 of the third lens L3 is convex at the paraxial region 101, an image side surface S8 of the third lens L3 is concave at the paraxial region 101, an object side surface S9 of the fourth lens L4 is concave at the paraxial region 101, an image side surface S10 of the fourth lens L4 is convex at the paraxial region 101, an object side surface S11 of the fifth lens L5 is concave at the paraxial region 101, a side surface S867 of the fifth lens L5 is convex at the paraxial region 101, a sixth lens L8672 is convex at the paraxial region 13, a lateral surface S13 of the second lens L13 is convex at the paraxial region 101, the image-side surface S16 of the seventh lens L7 is concave at the paraxial region 101.

An object side surface S2 of the first lens L1 is convex at the circumference, an image side surface S3 of the first lens L1 is concave at the circumference, an object side surface S5 of the second lens L2 is convex at the circumference, an image side surface S6 of the second lens L2 is concave at the circumference, an object side surface S7 of the third lens L3 is convex at the circumference, an image side surface S8 of the third lens L3 is concave at the circumference, an object side surface S9 of the fourth lens L4 is convex at the circumference, an image side surface S10 of the fourth lens L4 is convex at the circumference, an object side surface S10 of the fifth lens L10 is convex at the circumference, an image side surface S10 of the fifth lens L10 is concave at the circumference, an object side surface S10 of the sixth lens L10 is convex at the circumference, an image side surface S10 of the sixth lens L10 is convex at the circumference, a seventh image side surface S10 of the seventh lens L10 is concave at the circumference, and the object side surface S10 is convex at the circumference.

The lens parameters of the optical system 10 in the third embodiment are shown in tables 5 and 6, wherein the names of the elements and the definitions of the parameters can be obtained from the first embodiment, which are not repeated herein.

TABLE 5

In this embodiment, the object-side surface and the image-side surface of each of the seven lenses are aspheric surfaces, and the conic constant K and aspheric coefficients corresponding to the aspheric surfaces are shown in table 6:

TABLE 6

Number of noodles

2

3

5

6

7

8

9

K

-1.047E+01

-3.604E+01

-2.476E+01

-7.635E+01

-4.613E+01

-2.615E+01

-4.479E+01

A4

2.816E-01

9.165E-02

-3.581E-02

-2.276E-01

-1.753E-01

-2.491E-02

-9.306E-02

A6

-3.288E-01

-1.316E-01

-5.231E-03

3.767E-02

-3.072E-02

-2.979E-02

1.707E-01

A8

4.231E-01

2.833E-01

-5.496E-02

8.210E-01

2.255E-01

-3.799E-02

-2.091E-01

A10

-3.766E-01

-5.561E-01

1.587E-01

-2.747E+00

-6.174E-01

1.892E-01

2.401E-01

A12

2.140E-01

7.040E-01

-2.287E-01

4.250E+00

4.578E-01

-4.301E-01

-2.230E-01

A14

-6.418E-02

-5.097E-01

1.254E-01

-3.356E+00

3.698E-01

5.575E-01

1.435E-01

A16

6.444E-03

1.567E-01

0.000E+00

1.090E+00

-8.332E-01

-4.356E-01

-7.595E-02

A18

0.000E+00

3.945E-01

1.846E-01

2.904E-02

A20

0.000E+00

-3.155E-02

-4.856E-03

Number of noodles

10

11

12

13

14

15

16

K

-2.615E+01

3.452E+00

-1.398E+01

-3.281E+00

-4.503E+00

-3.215E+01

-5.167E+00

A4

-6.082E-02

1.479E-01

1.359E-01

-1.136E-02

-1.079E-01

-1.000E-01

-7.469E-02

A6

-8.274E-02

-4.281E-01

-2.191E-01

7.502E-03

4.250E-02

5.282E-04

3.469E-02

A8

2.890E-01

6.209E-01

5.443E-02

-1.904E-01

8.901E-03

2.968E-02

-1.192E-02

A10

-4.951E-01

-7.195E-01

9.552E-02

2.825E-01

-5.050E-02

-1.699E-02

2.857E-03

A12

5.423E-01

6.022E-01

-1.282E-01

-2.281E-01

4.913E-02

5.197E-03

-4.653E-04

A14

-3.601E-01

-3.254E-01

7.547E-02

1.149E-01

-2.232E-02

-9.791E-04

4.949E-05

A16

1.383E-01

1.071E-01

-2.352E-02

-3.503E-02

5.408E-03

1.126E-04

-3.248E-06

A18

-2.829E-02

-1.957E-02

3.737E-03

5.846E-03

-6.848E-04

-7.196E-06

1.185E-07

A20

2.398E-03

1.526E-03

-2.381E-04

-4.075E-04

3.599E-05

1.942E-07

-1.846E-09

In addition, as can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

In a fourth specific embodiment of the present application, referring to fig. 7 and 8, an optical system 10 of the fourth embodiment, in order from an object side to an image side along an optical axis 101, includes: a first lens L1 having positive power, a second lens L2 having positive power, a third lens L3 having negative power, a fourth lens L4 having positive power, a fifth lens L5 having positive power, a sixth lens L6 having positive power, and a seventh lens L7 having negative power.

An object side surface S2 of the first lens L1 is convex at the circumference, an image side surface S3 of the first lens L1 is concave at the circumference, an object side surface S5 of the second lens L2 is concave at the circumference, an image side surface S6 of the second lens L2 is concave at the circumference, an object side surface S7 of the third lens L3 is convex at the circumference, an image side surface S8 of the third lens L3 is concave at the circumference, an object side surface S9 of the fourth lens L4 is convex at the circumference, an image side surface S10 of the fourth lens L4 is convex at the circumference, an object side surface S10 of the fifth lens L10 is convex at the circumference, an image side surface S10 of the fifth lens L10 is concave at the circumference, an object side surface S10 of the sixth lens L10 is convex at the circumference, an image side surface S10 of the sixth lens L10 is convex at the circumference, a seventh image side surface S10 of the seventh lens L10 is convex at the circumference.

The lens parameters of the optical system 10 in the fourth embodiment are shown in tables 7 and 8, wherein the names of the elements and the definitions of the parameters can be found in the first embodiment, which is not repeated herein.

TABLE 7

In this embodiment, the object-side surface and the image-side surface of each of the seven lenses are aspheric surfaces, and the conic constant K and aspheric coefficients corresponding to the aspheric surfaces are shown in table 8:

TABLE 8

Number of noodles

2

3

5

6

7

8

9

K

-1.048E+01

-3.562E+01

-1.545E+01

-6.769E+01

-6.031E+01

-3.948E+01

-3.804E+01

A4

2.800E-01

7.964E-02

-4.924E-02

-3.423E-01

-2.196E-01

-4.924E-02

-1.489E-01

A6

-3.236E-01

-1.222E-01

3.026E-02

2.968E-01

4.937E-03

5.025E-02

3.757E-01

A8

4.183E-01

3.300E-01

-1.563E-01

5.754E-01

7.501E-01

-1.092E-01

-8.236E-01

A10

-3.724E-01

-7.123E-01

3.405E-01

-2.711E+00

-2.549E+00

-3.242E-02

1.219E+00

A12

2.135E-01

9.367E-01

-4.045E-01

4.286E+00

4.060E+00

3.186E-01

-1.229E+00

A14

-6.534E-02

-6.763E-01

1.877E-01

-3.309E+00

-3.669E+00

-4.989E-01

7.886E-01

A16

7.443E-03

2.032E-01

0.000E+00

1.046E+00

1.707E+00

3.701E-01

-3.039E-01

A18

0.000E+00

-2.826E-01

-1.309E-01

6.424E-02

A20

0.000E+00

1.772E-02

-5.749E-03

Number of noodles

10

11

12

13

14

15

16

K

-4.031E+01

4.638E-01

-5.708E+00

1.315E+00

-5.038E+00

-1.365E+01

-4.965E+00

A4

-1.499E-01

-8.946E-03

9.899E-02

8.879E-02

-1.575E-01

-2.096E-01

-1.015E-01

A6

2.266E-01

-4.617E-02

-1.961E-01

-1.983E-01

1.543E-01

9.656E-02

5.754E-02

A8

-3.921E-01

7.679E-02

1.106E-01

1.183E-01

-1.644E-01

-2.130E-02

-2.289E-02

A10

4.816E-01

-1.781E-01

-3.088E-02

-3.579E-02

1.302E-01

1.694E-03

6.221E-03

A12

-4.018E-01

2.499E-01

4.955E-03

6.365E-03

-6.841E-02

-2.435E-04

-1.151E-03

A14

2.329E-01

-1.832E-01

-4.796E-04

-6.941E-04

2.417E-02

2.703E-04

1.417E-04

A16

-9.129E-02

7.319E-02

2.772E-05

4.574E-05

-5.455E-03

-8.442E-05

-1.110E-05

A18

2.146E-02

-1.522E-02

-8.824E-07

-1.675E-06

6.965E-04

1.074E-05

5.042E-07

A20

-2.226E-03

1.292E-03

1.192E-08

2.618E-08

-3.784E-05

-5.053E-07

-1.015E-08

In addition, as can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

In a fifth specific embodiment of the present application, referring to fig. 9 and 10, an optical system 10 of the fifth embodiment, in order from an object side to an image side along an optical axis 101, includes: a first lens L1 having positive power, a second lens L2 having positive power, a third lens L3 having negative power, a fourth lens L4 having negative power, a fifth lens L5 having positive power, a sixth lens L6 having positive power, and a seventh lens L7 having negative power.

Wherein an object side surface S2 of the first lens L1 is convex at the paraxial region 101, an image side surface S3 of the first lens L1 is concave at the paraxial region 101, an object side surface S5 of the second lens L2 is concave at the paraxial region 101, an image side surface S6 of the second lens L2 is convex at the paraxial region 101, an object side surface S7 of the third lens L3 is convex at the paraxial region 101, an image side surface S8 of the third lens L3 is concave at the paraxial region 101, an object side surface S9 of the fourth lens L4 is convex at the paraxial region 101, an image side surface S10 of the fourth lens L4 is concave at the paraxial region 101, an object side surface S11 of the fifth lens L5 is convex at the paraxial region 101, a side surface S867 of the fifth lens L5 is concave at the paraxial region 101, a sixth lens L8672 is convex at the paraxial region 13, a lateral surface S13 of the second lens L13 is convex at the paraxial region 101, the image-side surface S16 of the seventh lens L7 is concave at the paraxial region 101.

An object side surface S2 of the first lens L1 is convex at the circumference, an image side surface S3 of the first lens L1 is concave at the circumference, an object side surface S5 of the second lens L2 is convex at the circumference, an image side surface S6 of the second lens L2 is concave at the circumference, an object side surface S7 of the third lens L3 is convex at the circumference, an image side surface S8 of the third lens L3 is concave at the circumference, an object side surface S9 of the fourth lens L4 is concave at the circumference, an image side surface S10 of the fourth lens L4 is convex at the circumference, an object side surface S10 of the fifth lens L10 is concave at the circumference, an image side surface S10 of the fifth lens L10 is convex at the circumference, an object side surface S10 of the sixth lens L10 is convex at the circumference, an image side surface S10 of the sixth lens L10 is convex at the circumference, a seventh image side surface S10 of the seventh lens L10 is concave at the circumference, and the object side surface S10 is convex at the circumference.

The lens parameters of the optical system 10 in the fifth embodiment are shown in tables 9 and 10, wherein the definitions of the names and parameters of the elements can be obtained from the first embodiment, which is not repeated herein.

TABLE 9

In this embodiment, the object-side surface and the image-side surface of each of the seven lenses are aspheric surfaces, and the conic constant K and aspheric coefficients corresponding to the aspheric surfaces are shown in table 10:

watch 10

Number of noodles

2

3

5

6

7

8

9

K

-1.078E+01

-3.178E+01

-9.177E+00

-7.635E+01

-5.576E+01

-2.660E+01

-2.667E+01

A4

2.988E-01

8.412E-02

-4.395E-02

-1.474E-01

-9.852E-02

1.593E-02

-1.887E-01

A6

-3.864E-01

-9.388E-02

-1.876E-02

-5.561E-01

-4.310E-01

-5.812E-02

6.129E-01

A8

5.606E-01

1.680E-01

-3.372E-02

2.699E+00

1.095E+00

-2.526E-01

-1.663E+00

A10

-5.745E-01

-3.304E-01

1.875E-01

-6.208E+00

-1.178E+00

1.002E+00

3.175E+00

A12

3.868E-01

4.680E-01

-3.135E-01

8.082E+00

-7.656E-01

-1.782E+00

-3.902E+00

A14

-1.476E-01

-3.912E-01

1.810E-01

-5.728E+00

3.254E+00

1.806E+00

3.019E+00

A16

2.431E-02

1.413E-01

0.000E+00

1.722E+00

-3.197E+00

-1.078E+00

-1.428E+00

A18

0.000E+00

1.109E+00

3.524E-01

3.768E-01

A20

0.000E+00

-4.818E-02

-4.230E-02

Number of noodles

10

11

12

13

14

15

16

K

-2.949E+01

1.235E+01

-1.734E+00

-1.398E+01

-4.678E+00

-1.215E+01

-5.083E+00

A4

-2.062E-01

-4.061E-02

8.074E-02

4.684E-02

-1.406E-01

-1.331E-01

-8.860E-02

A6

3.319E-01

-6.758E-02

-3.130E-01

-2.225E-01

1.372E-01

5.213E-03

4.639E-02

A8

-5.654E-01

2.067E-01

4.408E-01

2.138E-01

-1.707E-01

4.740E-02

-1.740E-02

A10

6.492E-01

-4.964E-01

-4.429E-01

-1.182E-01

1.458E-01

-3.427E-02

4.467E-03

A12

-4.623E-01

6.195E-01

3.141E-01

5.203E-02

-7.700E-02

1.247E-02

-7.766E-04

A14

2.190E-01

-4.140E-01

-1.502E-01

-2.321E-02

2.619E-02

-2.617E-03

8.861E-05

A16

-7.249E-02

1.536E-01

4.520E-02

8.228E-03

-5.550E-03

3.140E-04

-6.305E-06

A18

1.543E-02

-2.999E-02

-7.579E-03

-1.640E-03

6.540E-04

-1.946E-05

2.540E-07

A20

-1.529E-03

2.410E-03

5.342E-04

1.315E-04

-3.218E-05

4.533E-07

-4.463E-09

In addition, as can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

In a sixth specific embodiment of the present application, referring to fig. 11 and 12, an optical system 10 of the sixth embodiment, in order from an object side to an image side along an optical axis 101, includes: a first lens L1 having a power of addition, a second lens L2 having a positive power, a third lens L3 having a negative power, a fourth lens L4 having a negative power, a fifth lens L5 having a positive power, a sixth lens L6 having a positive power, and a seventh lens L7 having a negative power.

An object side surface S2 of the first lens L1 is convex at the circumference, an image side surface S3 of the first lens L1 is concave at the circumference, an object side surface S5 of the second lens L2 is concave at the circumference, an image side surface S6 of the second lens L2 is concave at the circumference, an object side surface S7 of the third lens L3 is convex at the circumference, an image side surface S8 of the third lens L3 is concave at the circumference, an object side surface S9 of the fourth lens L4 is convex at the circumference, an image side surface S10 of the fourth lens L4 is concave at the circumference, an object side surface S10 of the fifth lens L10 is concave at the circumference, an image side surface S10 of the fifth lens L10 is convex at the circumference, an object side surface S10 of the sixth lens L10 is concave at the circumference, an image side surface S10 of the sixth lens L10 is concave at the circumference, a seventh image side surface S10 of the seventh lens L10 is convex at the circumference.

The lens parameters of the optical system 10 in the sixth embodiment are given in tables 11 and 12, wherein the definitions of the names and parameters of the elements can be obtained from the first embodiment, which is not repeated herein.

TABLE 11

In this embodiment, the object-side surface and the image-side surface of each of the seven lenses are aspheric, and the conic constant K and aspheric coefficients corresponding to the aspheric surfaces are shown in table 12:

TABLE 12

Number of noodles

2

3

5

6

7

8

9

K

-1.074E+01

-3.735E+01

-2.187E+01

-7.635E+01

-6.014E+01

-3.340E+01

-4.122E+01

A4

2.748E-01

7.245E-02

-3.934E-02

-2.809E-01

-1.603E-01

-7.754E-02

-2.267E-01

A6

-3.188E-01

-9.288E-02

-8.140E-03

-4.477E-03

-2.699E-01

3.728E-01

8.617E-01

A8

4.114E-01

2.113E-01

-1.119E-02

1.381E+00

1.308E+00

-1.377E+00

-2.326E+00

A10

-3.690E-01

-4.182E-01

5.788E-02

-3.987E+00

-2.969E+00

2.839E+00

4.148E+00

A12

2.150E-01

5.222E-01

-1.202E-01

5.513E+00

3.615E+00

-3.704E+00

-4.889E+00

A14

-6.821E-02

-3.683E-01

7.406E-02

-3.954E+00

-2.348E+00

3.027E+00

3.686E+00

A16

8.389E-03

1.095E-01

0.000E+00

1.180E+00

5.702E-01

-1.510E+00

-1.708E+00

A18

0.000E+00

6.154E-02

4.252E-01

4.440E-01

A20

0.000E+00

-5.205E-02

-4.961E-02

Number of noodles

10

11

12

13

14

15

16

K

-3.253E+01

9.478E-01

-4.760E+00

-1.011E+01

-5.623E+00

-1.215E+01

-4.739E+00

A4

-1.748E-01

-2.137E-03

9.899E-02

9.408E-02

-1.224E-01

-2.025E-01

-1.115E-01

A6

3.401E-01

1.235E-02

-2.905E-01

-3.050E-01

9.310E-02

2.776E-02

6.318E-02

A8

-6.253E-01

-5.998E-02

3.334E-01

3.514E-01

-9.292E-02

6.582E-02

-2.413E-02

A10

7.696E-01

-1.761E-02

-2.862E-01

-2.995E-01

6.820E-02

-5.427E-02

6.206E-03

A12

-6.136E-01

1.018E-01

1.671E-01

1.837E-01

-2.899E-02

2.138E-02

-1.080E-03

A14

3.163E-01

-8.192E-02

-6.083E-02

-7.326E-02

7.552E-03

-4.907E-03

1.244E-04

A16

-1.027E-01

3.041E-02

1.320E-02

1.759E-02

-1.231E-03

6.654E-04

-9.049E-06

A18

1.921E-02

-5.575E-03

-1.538E-03

-2.281E-03

1.159E-04

-4.944E-05

3.772E-07

A20

-1.576E-03

4.053E-04

7.021E-05

1.217E-04

-4.737E-06

1.551E-06

-6.912E-09

In addition, as can be seen from the aberration diagram in fig. 12, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Referring to table 13, table 13 shows values of (sd71-sd21)/TTL, TTL/ImgH, f3/f, (et12+ et67)/(ct12+ ct67), f1/(ct1-et1), f2/(r22-r21), ct26/at26, and sag62/(sag71+ sag72) in the first to sixth embodiments of the present invention.

Watch 13

As can be seen from table 13, the optical systems 10 in the first to sixth embodiments all satisfy the following conditions: TTL/ImgH <1.5, -9< F3/F < -2, 13< F1/(ct1-et1) <18, 1< F2/(r22-r21) <3.5, 7.5< ct26/at26<10, 0.6< (et12+ et67)/(ct12+ ct67) <1.8, (sd71-sd21)/TTL >0.2, 0.9< sag62/(sag71+ sag72) < 2.4.

As shown in fig. 13, the present invention further provides an image capturing module 100 having the optical system 10 of the above embodiment.

As shown in fig. 13, the image capturing module 100 according to the embodiment of the invention includes an optical system 10 and a photosensitive element 20, and the photosensitive element 20 is disposed on the image side of the optical system 10.

According to the image capturing module 100 of the embodiment of the invention, the first lens L1 to the seventh lens L7 of the optical system 10 are installed in the lens module, and the surface shape and the focal power of each lens of the first lens L1 to the seventh lens L7 are reasonably configured, so that the image capturing module 100 can meet the requirement of miniaturization, and the image capturing module 100 can obtain a larger imaging range.

As shown in fig. 14, the present invention further provides an electronic device 1000 having the optical system 10 of the above embodiment.

As shown in fig. 14, the electronic device 1000 according to the embodiment of the invention includes a housing 200 and an image capturing module 100, wherein the image capturing module 100 is mounted on the housing 200. The electronic device can be a smart phone, a Personal Digital Assistant (PDA), a tablet computer, a smart watch, an unmanned aerial vehicle, an electronic book reader, a vehicle event data recorder, a wearable device and the like.

According to the electronic device 1000 of the embodiment of the invention, by arranging the image capturing module 100 in the housing 200, the electronic device 1000 can meet the requirement of miniaturization, and the electronic device 1000 can obtain a larger imaging range.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application 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.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An optical system comprising, in order from an object side to an image side along an optical axis:

a first lens element with positive optical power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a second lens element with positive optical power having a concave object-side surface at paraxial region and a convex image-side surface at paraxial region;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens element with positive optical power having a convex image-side surface at paraxial region;

a seventh lens element with negative optical power, whose image-side surface is concave at paraxial region;

wherein the optical system satisfies the following relation: (sd71-sd21)/TTL >0.2, sd71 is half of the maximum effective half caliber of the object side surface of the seventh lens, sd21 is half of the maximum effective half caliber of the object side surface of the second lens, and TTL is the distance between the object side surface of the first lens and an image plane on the optical axis.

2. The optical system according to claim 1, wherein the optical system satisfies the following relation:

TTL/ImgH<1.5；

wherein ImgH is half of the diagonal of the effective imaging area.

3. The optical system according to claim 1, wherein the optical system satisfies the following relation:

0.6<(et12+et67)/(ct12+ct67)<1.8；

et12 is the distance between the maximum effective half aperture of the image side surface of the first lens and the maximum effective half aperture of the object side surface of the second lens in the optical axis direction; et67 is the distance on the optical axis from the maximum effective half aperture of the object side surface of the seventh lens at the maximum effective half aperture of the image side surface of the sixth lens; ct12 is the distance from the intersection point of the image side surface of the first lens and the optical axis to the intersection point of the object side surface of the second lens and the optical axis; ct67 is the distance from the intersection point of the image side surface of the sixth lens element and the optical axis to the intersection point of the object side surface of the seventh lens element and the optical axis.

4. The optical system according to claim 1, wherein the optical system satisfies the following relation:

13<f1/(ct1-et1)<18；

wherein f1 is the first lens effective focal length; ct1 is the distance from the intersection point of the object side surface of the first lens and the optical axis to the intersection point of the image side surface of the first lens and the optical axis; et1 is the distance from the maximum effective half aperture of the object side surface of the first lens to the maximum effective half aperture of the image side surface of the first lens in the optical axis direction.

5. The optical system according to claim 1, wherein the optical system satisfies the following relation:

1<f2/(r22-r21)<3.5；

wherein f2 is the second lens effective focal length; r22 is the radius of curvature of the image side surface of the second lens at the optical axis; r21 is the object side radius of curvature of the second lens.

6. The optical system according to claim 1, wherein the optical system satisfies the following relation:

7.5<ct26/at26<10；

wherein ct26 is a distance from an intersection point of the object side surface of the second lens and the optical axis to an intersection point of the image side surface of the sixth lens and the optical axis; at26 is the sum of the air spaces on the optical axis between the second lens and the sixth lens.

7. The optical system according to claim 1, wherein the optical system satisfies the following relation:

0.9<sag62/(sag71+sag72)<2.4；

wherein sag62 is a saggital height of an image-side surface of the sixth lens, sag71 is a saggital height of an object-side surface of the seventh lens, and sag72 is a saggital height of an image-side surface of the seventh lens.

8. The optical system according to claim 1, wherein the optical system satisfies the following relation:

-9<f3/f<-2；

wherein f3 is the effective focal length of the third lens; f is the effective focal length of the optical system.

9. An image capturing module, comprising:

the optical system of any one of claims 1 to 8;

a photosensitive element disposed on an image side of the optical system.

10. An electronic device, comprising:

a housing;

the image capture module of claim 9, mounted on the housing.