CN114002822B

CN114002822B - Optical lens, camera module and electronic equipment

Info

Publication number: CN114002822B
Application number: CN202111513774.0A
Authority: CN
Inventors: 党绪文; 刘彬彬; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2023-08-08
Anticipated expiration: 2041-12-10
Also published as: CN114002822A

Abstract

The application discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis, the first lens has positive focal power, an object side surface and an image side surface of the first lens are respectively a convex surface and a concave surface at a paraxial region, the second lens has positive focal power, an image side surface of the second lens is a convex surface at an optical axis, and the third lens has focal power; the fourth lens is provided with focal power, and the object side surface of the fourth lens is a convex surface at a paraxial region; the fifth lens element has optical power, wherein an object-side surface and an image-side surface thereof are convex and concave at a paraxial region thereof, respectively, and the optical lens assembly satisfies the following relationship: 1.2 < SD11/SD21 < 1.6. The optical lens, the camera module and the electronic equipment can realize the imaging effect of the ultra-wide angle on the basis of considering the miniaturization, the light and thin design of the optical lens.

Description

Optical lens, camera module and electronic equipment

Technical Field

The application relates to the technical field of optical imaging, in particular to an optical lens, a camera module and electronic equipment.

Background

In recent years, various electronic devices (including digital cameras, smartphones, notebook computers, tablet computers, and the like) equipped with imaging lenses are rapidly spreading. The portability of the electronic equipment is improved, higher requirements are put on the thickness of the camera lens, meanwhile, the use of a large image plane chip becomes a necessary trend, so that the thickness of the camera lens is reduced, and the imaging image quality is reduced and the manufacturability is deteriorated due to the support of maintaining the large image plane; particularly, for the ultra-wide angle imaging lens, since the conventional ultra-wide angle imaging lens uses a similar symmetrical structure with a diaphragm, it is difficult to make the ultra-wide angle imaging lens sufficiently miniaturized, so the problems of improving the lightness and thinness of the ultra-wide angle imaging lens and maintaining good imaging quality are needed to be solved.

Disclosure of Invention

The embodiment of the application discloses an optical lens, a camera module and electronic equipment, which can realize the imaging effect of ultra-wide angle on the basis of considering the miniaturization, the frivolity and the design of the optical lens.

In order to achieve the above object, the present application discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side to an image side along an optical axis;

the first lens has positive focal power, and the object side surface and the image side surface of the first lens are respectively convex and concave at a paraxial region;

the second lens has positive focal power, and the image side surface of the second lens is a convex surface at a paraxial region;

the third lens has optical power;

the fourth lens is provided with focal power, and the object side surface of the fourth lens is a concave surface at a paraxial region;

the fifth lens element has optical power, and an object-side surface and an image-side surface of the fifth lens element are convex and concave at a paraxial region thereof respectively;

the optical lens further comprises a diaphragm, and the diaphragm is positioned between the first lens and the second lens;

the optical lens satisfies the following relation:

1.2 < SD11/SD21 < 1.6, wherein SD11 is the maximum effective half-caliber of the object side surface of the first lens, and SD21 is the maximum effective half-caliber of the object side surface of the second lens.

In the optical lens provided by the application, as the first lens has positive focal power, the total length of the optical lens is shortened, and the positive focal power of the first lens is enhanced by matching the convex surface and the concave surface of the object side surface and the image side surface of the first lens at the paraxial region, and meanwhile, a reasonable light incident angle is further provided for the introduction of marginal large-angle light rays; the second lens has positive focal power, and the image side surface of the second lens is convex at the paraxial region, so that the focal power of the second lens is increased, the contracted light of the first lens can be gradually diffused, and the deflection angle of the light is reduced. The object side surface of the fourth lens is designed to be concave at the paraxial region, so that the compactness between the lenses of the optical lens is improved, the total length of the optical lens is shortened, the miniaturization design of the optical lens is realized, the object side surface and the image side surface of the fifth lens are matched with the design of convex surfaces and concave surfaces at the paraxial region, the distortion, the astigmatism and the field curvature are corrected, the optical lens can meet the imaging requirement of low aberration and high image quality, and meanwhile, when the optical lens is applied to an imaging module, the optical lens can be matched with a high-brightness photosensitive chip, so that the ultra-wide angle and large image plane imaging is realized.

Further, the diaphragm of the optical lens is located between the first lens and the second lens, that is, a front diaphragm is adopted, so that the miniaturization design of the optical lens is facilitated.

In addition, by limiting the optical lens to satisfy the above relation 1.2 < SD11/SD21 < 1.6, that is, by restricting the ratio of the maximum effective half-caliber of the object side surface of the first lens to the maximum effective half-caliber of the object side surface of the second lens, the size of the effective half-caliber of the object side surface of the first lens can be effectively controlled, and the small-head small-light-passing hole characteristic of the object side surface of the head lens of the optical lens can be realized. The diaphragm combined with the lens structure is positioned between the first lens and the second lens, and solves the problem that the maximum effective half caliber of the object side surface of the first lens of the ultra-wide angle optical lens in the related art is large and the small head cannot be realized. When the upper limit of the relation is exceeded, that is, SD11/SD21 is larger than 1.6, the maximum effective half caliber of the first lens is larger, and the requirement of the small head of the optical lens cannot be met. When the lower limit of the relation is exceeded, that is, SD11/SD21 is smaller than 1.2, the maximum effective half caliber of the first lens is too small, so that it is difficult to ensure the ultra-wide angle and the reasonable center thickness of the first lens at the same time, that is, when the ratio is too small, the first lens is very close to the second lens and the diaphragm, so that the center thickness of the first lens is severely compressed.

Therefore, the optical lens can be designed in a super wide angle, a large image plane and miniaturization, and can be suitable for imaging modules and electronic equipment with miniaturization design requirements.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation:

0.8＜|f4/R42|＜8.8；

where f4 is a focal length of the fourth lens element, and R42 is a radius of curvature of an image-side surface of the fourth lens element at the optical axis.

The optical power of the fourth lens is adjusted by restraining the curvature radius of the image side surface of the fourth lens on the optical axis, so that the influence of the optical power on the processing performance of the fourth lens caused by excessive concentration on the fourth lens is avoided, the restriction of the object side surface and the image side surface of the fourth lens is facilitated, and the influence of excessive bending on the processing manufacturability of the fourth lens is avoided. In addition, the above relation is satisfied, and on the basis of reducing three-level aberration such as spherical aberration, coma aberration and curvature of field, the correction of higher-order aberration can be further enhanced, and the tolerance sensitivity of the optical lens can be reduced. When the lower limit of the above relation is exceeded, the optical power of the fourth lens is too concentrated, which causes the image-side surface of the fourth lens to be too curved, which is detrimental to the manufacturability of the fourth lens. When the upper limit of the relation is exceeded, the focal power of the fourth lens is insufficient, which is unfavorable for correcting the aberration of the optical lens and affects the tolerance sensitivity of the optical lens.

Preferably, 0.6mm < R42| < 3.5mm, so that under the constraint of the curvature radius of the image side surface of the fourth lens, excessive bending of the image side surface of the fourth lens, particularly the bulge of the central area, is avoided, thereby reducing low-angle stray light reflection of the fourth lens and reducing the influence of ghost images on imaging.

85°＜FOV*IMGH/TTL＜110°；

wherein, FOV is the maximum angle of view of the optical lens, TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, that is, the total length of the optical lens, and IMGH is half of the image height corresponding to the maximum angle of view of the optical lens.

The relation reflects the constraint condition of the optical lens on the characteristics of the angle of view and the lightness and thinness, and when the relation is satisfied, the requirement of the optical lens on lightness and thinness can be satisfied on the basis of satisfying the ultra wide angle of the optical lens, so that the optical lens can also have lightness and thinness comparable to those of the optical lens with the large angle of view in the related art, and the requirement of the market on miniaturization of the optical lens can be satisfied. When FOV is greater than 110 °, IMGH/TTL is further reduced on the basis of ensuring that the field angle of the optical lens is ultra-wide angle, the lightness and thinness of the optical lens are excessively compressed, and the performance of the optical lens is not improved. When the FOV is less than 85 degrees, the light and thin performance of the optical lens is insufficient, and the miniaturization design of the optical lens is not facilitated.

110 DEG < FOV < 132 deg. When the relation is satisfied, the optical lens can have a larger field angle, thereby realizing ultra-wide angle imaging.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: 3.7mm < TTL < 4.15mm, so that the total length of the optical lens is kept in a smaller range, and the design requirement of ultra-wide angle miniaturization can be met.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: 1.9 < FNo < 2.5, where FNo is the f-number of the optical lens. Thus, the optical lens can have a reasonable light entering amount, thereby being beneficial to obtaining reasonable resolution of the optical lens.

0.32mm＜CT1+CT12＜0.45mm；

wherein, CT1 is the thickness of the first lens element on the optical axis, i.e. the center thickness of the first lens element, and CT12 is the distance between the image side surface of the first lens element and the object side surface of the second lens element on the optical axis, i.e. the gap between the first lens element and the second lens element.

As can be seen from the foregoing, the aperture of the optical lens is located between the first lens and the second lens, and the axial distance from the object side surface of the first lens to the object side surface of the second lens is restricted, so that the distance between the first lens and the aperture as well as the distance between the first lens and the second lens can be shortened, thereby avoiding the situation that the first lens of the optical lens in the related art is far away from the second lens, being beneficial to reducing the gap between the first lens and the second lens, and enabling the optical lens to achieve a miniaturized design. In addition, the center thickness of the first lens and the gap between the first lens and the second lens are controlled, so that the first lens and the second lens have processing rationality, the processing of the first lens and the second lens is facilitated, and the processing difficulty of the optical lens is reduced.

Preferably, 0.05mm < CT12 < 0.2mm, so that the gap between the first lens and the second lens is kept in a reasonable range, and the gap between the first lens and the second lens of the optical lens can be fully compressed, thereby realizing miniaturization and small head characteristics of the optical lens.

1.0＜|f1/f5|＜17；

Wherein f1 is the focal length of the first lens and f5 is the focal length of the fifth lens.

By restricting the ratio of the focal length of the first lens to the focal length of the fifth lens, the focal power distribution of the first lens and the fifth lens in the optical lens can be reasonably distributed, so that the small head requirement of the optical lens is met, and meanwhile, the reasonable aberration balance and resolution requirement of the optical lens are maintained. In addition, as the first lens is close to the second lens and has positive focal power, compared with the first lens with negative focal power, the first lens with positive focal power has small distortion amount on light rays with large angle of view angles, and is favorable for reducing the distortion of the optical lens. In addition, by combining the control of the focal length of the fifth lens, the distortion amount of the optical lens can be reasonably corrected, and the optical distortion can be reasonably controlled.

0.18＜FFL/TTL＜0.24；

wherein FFL is the shortest distance from the image side surface of the fifth lens element to the imaging surface of the optical lens element in the optical axis direction, i.e., the back focal length of the optical lens element, and TTL is the distance from the object side surface of the first lens element to the imaging surface of the optical lens element in the optical axis direction, i.e., the total length of the optical lens element.

The ratio of the back focal length of the optical lens to the total length of the optical lens is controlled, so that the back focal length of the optical lens and the total length of the optical lens have a certain matching relation, and the adverse condition that the total length of the optical lens is too long and the back focal length of the optical lens is too short is avoided; the back focal length of the optical lens is reasonable, when the optical lens is applied to the camera module, the situation that the assembly feasibility and the assembly yield of the camera module are affected due to the fact that the optical lens is too close to the photosensitive chip of the camera module can be avoided, and therefore the matching performance of different photosensitive chips can be improved. When FFL/TTL is more than 0.24, the back focal length of the optical lens is overlarge, so that the space of each lens of the optical lens is compressed, and the performance optimization of the optical lens is not facilitated; when FFL/TTL is smaller than 0.18, the back focal length of the optical lens is too small, the optical lens is difficult to match with the photosensitive chip, and the assembly risk of the optical lens is increased.

0.52＜SD51/IMGH＜0.78；

the SD51 is the maximum effective half aperture of the object side surface of the fifth lens, and the IMGH is half of the image height corresponding to the maximum field angle of the optical lens.

The maximum effective half caliber of the object side surface of the fifth lens can be limited in a reasonable range by limiting the ratio of the maximum effective half caliber of the object side surface of the fifth lens to the half image height corresponding to the maximum field angle of the optical lens, so that the miniaturized design of the optical lens is realized. And secondly, when the relation is satisfied, the lifting distance of the edge light passing through the fifth lens is proper, so that when the optical lens is applied to the camera module, the proper incidence angle between the light passing through the optical lens and the photosensitive chip of the camera module can be maintained, and the difficulty in matching the photosensitive chip caused by overlarge incidence angle is avoided. In addition, when the relation is satisfied, the lifting distance of the light is proper, and a reasonable beam caliber is provided for the marginal light, so that the optical lens is light and thin and designed, and meanwhile, reasonable relative illuminance is provided, and dark angles are avoided.

1.4＜f23/f＜2.2；

where f23 is a combined focal length of the second lens and the third lens, and f is an effective focal length of the optical lens.

The ratio of the combined focal length of the second lens and the third lens to the effective focal length of the optical lens is restricted, so that the focal powers of the second lens and the third lens are distributed properly, and the third lens can generate various cooperativity, so that the balance of the internal aberration of the optical lens can be realized on the basis of meeting the miniaturization design of the optical lens, the field curvature and the astigmatism of the imaging edge of the optical lens can be adjusted, and the imaging quality of the optical lens to the surrounding environment can be met.

In a second aspect, the application discloses a camera module, where the camera module includes a photosensitive chip and the optical lens according to the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can simultaneously meet the shooting effect of a large visual angle and has a miniaturized design.

In a third aspect, the application discloses an electronic device, where the electronic device includes a housing and a camera module set according to the second aspect, and the camera module set is disposed on the housing. The electronic equipment with the camera module can simultaneously meet the shooting effect of a large visual angle and achieve miniaturization design.

Compared with the prior art, the beneficial effect of this application lies in:

in the optical lens provided by the application, because the first lens has positive focal power, the total length of the optical lens is shortened, and the design that the object side surface and the image side surface of the first lens are respectively convex and concave at the paraxial region is matched, the positive focal power of the first lens is enhanced, and meanwhile, a reasonable light incident angle is further provided for the introduction of marginal large-angle light rays; the second lens has positive focal power, and the image side surface of the second lens is convex at the paraxial region, so that the focal power of the second lens is increased, the contracted light of the first lens can be gradually diffused, and the deflection angle of the light is reduced. The object side surface of the fourth lens is designed to be concave at the paraxial region, so that the compactness between the lenses of the optical lens is improved, the total length of the optical lens is shortened, the miniaturization design of the optical lens is realized, the object side surface and the image side surface of the fifth lens are matched with the design of convex surfaces and concave surfaces at the paraxial region, the distortion, the astigmatism and the field curvature are corrected, the optical lens can meet the imaging requirement of low aberration and high image quality, and meanwhile, when the optical lens is applied to an imaging module, the optical lens can be matched with a high-brightness photosensitive chip, so that the ultra-wide angle and large image plane imaging is realized. In addition, by limiting the optical lens to satisfy the above relation 1.2 < SD11/SD21 < 1.6, that is, by restricting the ratio of the maximum effective half-caliber of the object side surface of the first lens to the maximum effective half-caliber of the object side surface of the second lens, the size of the effective half-caliber of the object side surface of the first lens can be effectively controlled, and the small-head small-light-passing hole characteristic of the object side surface of the head lens of the optical lens can be realized. The diaphragm combined with the lens structure is positioned between the first lens and the second lens, and solves the problem that the maximum effective half caliber of the object side surface of the first lens of the ultra-wide angle optical lens in the related art is large and the small head cannot be realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an optical lens disclosed in a first embodiment of the present application;

fig. 2 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the first embodiment of the present application;

FIG. 3 is a schematic view of an optical lens disclosed in a second embodiment of the present application;

fig. 4 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the second embodiment of the present application;

fig. 5 is a schematic structural view of an optical lens disclosed in a third embodiment of the present application;

fig. 6 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a third embodiment of the present application;

fig. 7 is a schematic structural view of an optical lens disclosed in a fourth embodiment of the present application;

Fig. 8 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a fourth embodiment of the present application;

fig. 9 is a schematic structural view of an optical lens disclosed in a fifth embodiment of the present application;

fig. 10 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the fifth embodiment of the present application;

fig. 11 is a schematic structural view of an optical lens disclosed in a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a sixth embodiment of the present application;

FIG. 13 is a schematic view of a lens module disclosed in the present application;

fig. 14 is a schematic structural view of an electronic device disclosed in the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The technical scheme of the present application will be further described with reference to examples and drawings.

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 sequentially disposed from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence from the object side of the first lens L1, and finally is imaged on the imaging surface 101 of the optical lens 100. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has positive or negative power, the fourth lens L4 has positive or negative power, and the fifth lens L5 has positive or negative power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 of the second lens element L2 can be concave or convex at a paraxial region O, and the image-side surface 22 of the second lens element L2 can be convex at the paraxial region O; the object-side surface 31 of the third lens element L3 is convex at a paraxial region O, and the image-side surface 32 of the third lens element L3 is concave or convex at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is concave at a paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex or concave at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O.

Further, the object-side surface 11 of the first lens element L1 is convex or concave at the circumference, and the image-side surface 12 of the first lens element L1 is concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, at the circumference; the object-side surface 31 of the third lens element L3 can be concave or convex at the circumference, and the image-side surface 32 of the third lens element L3 can be concave or convex at the circumference; the object-side surface 41 of the fourth lens element L4 is concave at the circumference, and the image-side surface 42 of the fourth lens element L4 can be concave or convex at the circumference; the object-side surface 51 of the fifth lens element L5 is concave at the circumference, and the image-side surface 52 of the fifth lens element L5 is convex at the circumference.

In some embodiments, in the first lens element L1 to the sixth lens element L6, each of the object-side surface and the image-side surface of the lens element is aspheric. That is, each of the first to sixth lenses L1 to L6 is an aspherical lens. The aspherical lens can reduce the processing difficulty of the lens, can realize more complex surface design, and is beneficial to reducing the processing difficulty and the surface design difficulty of the optical lens.

Further, considering that the optical lens 100 is applied to miniaturized electronic devices, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 may be plastic lenses, which are more lightweight, and can adapt to the lightweight design of the optical lens 100 when the optical lens 100 is applied to the electronic devices.

In some embodiments, the optical lens 100 further includes a diaphragm 102, where the diaphragm 102 may be an aperture diaphragm and/or a field diaphragm, and may be disposed between the first lens L1 and the second lens L2, that is, the diaphragm 102 is a front diaphragm, and the front diaphragm is disposed, so that the head lens of the optical lens 100 can be miniaturized, and the small head requirement of the optical lens 100 is met. It is to be understood that, in other embodiments, the diaphragm 102 may be disposed between other lenses or between the object side of the optical lens 100 and the object side 11 of the first lens L1, and the arrangement may be specifically adjusted according to practical situations, which is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 further includes an infrared filter 60, and the infrared filter 60 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100. The infrared filter 60 is selected, and the imaging quality is improved by filtering infrared light, so that the imaging is more in line with the visual experience of human eyes. It is to be understood that the infrared filter 60 may be made of an optical glass coating, or may be made of colored glass, or the infrared filter 60 made of other materials may be selected according to actual needs, and is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < SD11/SD21 < 1.6, wherein SD11 is the maximum effective half-caliber of the object side surface 11 of the first lens L1, and SD21 is the maximum effective half-caliber of the object side surface 21 of the second lens L2. By defining the optical lens 100 to satisfy the above-described relation 1.2 < SD11/SD21 < 1.6, that is, by restricting the ratio of the maximum effective half-caliber of the object-side surface 11 of the first lens L1 to the maximum effective half-caliber of the object-side surface 21 of the second lens L2, the size of the maximum effective half-caliber of the object-side surface 11 of the first lens L1 can be effectively controlled, and the object-side small-end light-passing hole characteristic of the head lens of the optical lens 100 can be realized. The diaphragm 102 combined with the present application is located between the first lens L1 and the second lens L2, so as to solve the problem that the maximum effective half caliber of the object side surface 11 of the first lens L1 of the ultra-wide angle optical lens in the related art is large, and the small head cannot be realized. When the upper limit of the above relation is exceeded, that is, SD11/SD21 > 1.6, the maximum effective half-caliber of the first lens L1 is larger, and the small-head requirement of the optical lens 100 cannot be satisfied. When the lower limit of the above relation is exceeded, that is, SD11/SD21 < 1.2, the maximum effective half-caliber of the first lens L1 is too small, so that it is difficult to ensure the ultra-wide angle and the reasonable center thickness of the first lens L1 at the same time, that is, when the above ratio is too small, the first lens L1 is very close to the second lens L2 and the diaphragm 102, resulting in serious compression of the center thickness of the first lens L1.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8 < |f4/R42| < 8.8; where f4 is the focal length of the fourth lens element L4, and R42 is the radius of curvature of the image-side surface 42 of the fourth lens element L4 at the optical axis O.

By restricting the radius of curvature of the image-side surface 42 of the fourth lens element L4 at the optical axis O, the focal power of the fourth lens element L4 is adjusted, so as to avoid the influence of the process performance of the fourth lens element L4 caused by too concentrating the focal power on the fourth lens element L4, and simultaneously, the restriction of the surface shapes of the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 is facilitated, and the influence of excessive bending on the process manufacturability of the fourth lens element L4 is avoided. In addition, the above relation is satisfied, and the correction of the higher-order aberration can be further enhanced to reduce the tolerance sensitivity of the optical lens 100, while reducing the three-order aberration such as spherical aberration, coma aberration, and curvature of field. When the lower limit of the above relation is exceeded, the optical power of the fourth lens L4 is too concentrated, which causes the image side surface 42 of the fourth lens L4 to be too curved, which is detrimental to the manufacturability of the fourth lens L4. When the upper limit of the above relation is exceeded, the optical power of the fourth lens L4 is insufficient, which is detrimental to the correction of the aberration of the optical lens 100, and affects the tolerance sensitivity of the optical lens 100.

In some embodiments, 85 ° < FOV × IMGH/TTL < 110 °; where FOV is the maximum angle of view of the optical lens 100, TTL is the distance between the object side surface 11 of the first lens L1 and the imaging surface 101 of the optical lens 100 on the optical axis O, that is, the total length of the optical lens 100, and IMGH is half of the image height corresponding to the maximum angle of view of the optical lens 100.

The relation reflects the constraint condition of the optical lens 100 on the view angle and the light and thin characteristics, and when the relation is satisfied, the requirement of the optical lens 100 on the light and thin property can be satisfied on the basis of satisfying the ultra wide angle of the optical lens 100, so that the optical lens 100 can also have the light and thin property comparable to the large view angle optical lens in the related art, and the requirement of the market on the miniaturization of the optical lens 100 can be satisfied. When FOV is greater than 110 °, IMGH/TTL is further reduced on the basis of ensuring that the field angle of the optical lens 100 is ultra-wide angle, the thinness of the optical lens 100 is excessively compressed, which is not beneficial to the improvement of the performance of the optical lens 100. When FOV is less than 85 °, the thinness of the optical lens 100 is insufficient, which is not beneficial to the miniaturization design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: CT1 and CT12 are more than 0.32mm and less than 0.45mm; the CT1 is a thickness of the first lens element L1 on the optical axis O, i.e., a center thickness of the first lens element L1, and the CT12 is a distance between the image side 12 of the first lens element L1 and the object side 21 of the second lens element L2 on the optical axis O, i.e., a gap between the first lens element L1 and the second lens element L2.

As can be seen from the foregoing, the diaphragm 102 of the optical lens 100 is located between the first lens L1 and the second lens L2, and in combination with restricting the axial distance from the object side surface 11 of the first lens L1 to the object side surface 21 of the second lens L2, the distance between the first lens L1 and the diaphragm 102 and the distance between the second lens L2 can be shortened, so that the situation that the first lens of the optical lens in the related art is far away from the second lens can be avoided, which is beneficial to reducing the gap between the first lens L1 and the second lens L2, thereby enabling the optical lens 100 to achieve a miniaturized design. In addition, the center thickness of the first lens L1 and the gap between the first lens L1 and the second lens L2 are controlled, so that the first lens L1 and the second lens L2 have processing rationality, the processing of the first lens L1 and the second lens L2 is facilitated, and the processing difficulty of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0 < |f1/f5| < 17; where f1 is the focal length of the first lens L1, and f5 is the focal length of the fifth lens L5.

By restricting the ratio of the focal length of the first lens L1 to the focal length of the fifth lens L5, the optical power distribution of the first lens L1 and the fifth lens L5 in the optical lens 100 can be reasonably distributed, so that the small head requirement of the optical lens 100 is met while the reasonable aberration balance and resolution requirement of the optical lens 100 are maintained. In addition, since the first lens L1 is disposed close to the second lens L2 and has positive optical power, compared with the first lens with negative optical power, the first lens L1 with positive optical power has small distortion amount for light with large angle of view angle, which is beneficial to reducing distortion of the optical lens 100. Further, in combination with the control of the focal length of the fifth lens L5, the amount of distortion of the optical lens 100 can be reasonably corrected and controlled.

In some embodiments, the optical lens 100 satisfies the following relationship: FFL/TTL of 0.18 to 0.24; here, FFL is the shortest distance between the image side surface 52 of the fifth lens element L5 and the imaging surface 101 of the optical lens 100 in the optical axis direction, i.e. the back focal length of the optical lens 100, and TTL is the distance between the object side surface 11 of the first lens element L1 and the imaging surface 101 of the optical lens 100 in the optical axis direction, i.e. the total length of the optical lens.

By controlling the ratio of the back focal length of the optical lens 100 to the total length of the optical lens 100, the back focal length of the optical lens 100 has a certain matching relation with the total length of the optical lens 100, and the adverse condition that the total length of the optical lens 100 is too long and the back focal length of the optical lens 100 is too short is avoided; reasonable back focal length of the optical lens 100, when the optical lens 100 is applied to a camera module, the situation that the assembly feasibility and the assembly yield of the camera module are affected due to the fact that the optical lens 100 is too close to a photosensitive chip of the camera module can be avoided, and accordingly the matching performance of different photosensitive chips can be improved. When FFL/TTL is more than 0.24, the back focal length of the optical lens 100 is overlarge, so that the space of each lens of the optical lens 100 is compressed, and the performance optimization of the optical lens 100 is not facilitated; when FFL/TTL is less than 0.18, the back focal length of the optical lens 100 is too small, so that the optical lens 100 is difficult to match with the photosensitive chip, and the assembly risk of the optical lens 100 is increased.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.52 < SD51/IMGH < 0.78; here, SD51 is the maximum effective half aperture of the object side surface 51 of the fifth lens L5, and IMGH is half of the image height corresponding to the maximum field angle of the optical lens 100.

By defining the ratio of the maximum effective half-caliber of the object side surface 51 of the fifth lens element L5 to the image height corresponding to the maximum field angle of the optical lens 100, the maximum effective half-caliber of the object side surface 51 of the fifth lens element L5 can be restricted to a reasonable range, thereby realizing the compact design of the optical lens 100. Secondly, when the above relation is satisfied, the lifting distance of the edge light passing through the fifth lens L5 is appropriate, so that when the optical lens 100 is applied to the image capturing module, the proper incident angle between the light passing through the optical lens 100 and the photosensitive chip of the image capturing module can be maintained, and the difficulty in matching the photosensitive chip caused by overlarge incident angle is avoided. In addition, when the above relation is satisfied, the lifting distance of the light is appropriate, and a reasonable beam caliber is provided for the marginal light, so that the optical lens 100 provides reasonable relative illuminance while realizing light and thin design, and avoids generating a dark angle.

In some embodiments, the optical lens 100 satisfies the following relationship: f23/f is more than 1.4 and less than 2.2; where f23 is the combined focal length of the second lens L2 and the third lens L3, and f is the effective focal length of the optical lens 100.

By restricting the ratio of the combined focal length of the second lens L2 and the third lens L3 to the effective focal length of the optical lens 100, the focal powers of the second lens L2 and the third lens L3 can be properly distributed, so that the third lens L3 can generate various cooperativity, and the balance of the internal aberration of the optical lens 100 can be realized on the basis of meeting the miniaturization design of the optical lens 100, thereby being beneficial to adjusting the field curvature and the astigmatism of the imaging edge of the optical lens 100 and meeting the imaging quality of the optical lens 100 to the surrounding environment.

The optical lens 100 of the present embodiment will be described in detail below with reference to specific parameters.

First embodiment

As shown in fig. 1, the optical lens 100 according to the first embodiment of the present application includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has positive power, the fourth lens L4 has positive power, and the fifth lens L5 has negative power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex at a paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region O.

Further, the object side surface 11 and the image side surface 12 of the first lens element L1 are concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, at the circumference; the object side surface 31 and the image side surface 32 of the third lens element L3 are concave and convex, respectively, at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

Specifically, taking the effective focal length f=2.24 mm of the optical lens 100, the f-number fno=2.29 of the optical lens 100, the maximum field angle fov= 127.17 ° of the optical lens 100, the total length ttl=3.86 mm of the optical lens as an example, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 1 and 2 correspond to the object side surface 11 and the image side surface 12 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis. The first value in the "thickness" parameter row of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis. The value of the diaphragm in the parameter array of the thickness is the distance between the diaphragm and the vertex of the latter surface (the vertex refers to the intersection point of the surface and the optical axis) on the optical axis, the direction from the object side surface of the first lens to the image side surface of the last lens is defaulting to the positive direction of the optical axis, when the value is negative, the diaphragm is arranged on the image side of the vertex of the latter surface, and when the thickness of the diaphragm is positive, the diaphragm is arranged on the object side of the vertex of the latter surface. It is understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index, abbe number, and focal length in Table 1 were obtained at a reference wavelength of 587.6 nm.

Further, in the first lens L1 to the sixth lens L6, each lens is an aspherical lens, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis O direction; c is the curvature of the aspherical surface at the optical axis O, c=1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conical coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical lenses in the first embodiment are given in table 2 below.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration diagram of the optical lens 100 of the first embodiment at wavelengths of 470.0nm, 510.0nm, 587.6nm, 610.0nm, and 650.0 nm. In fig. 2 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the optical lens 100 in the first embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 2 (B), fig. 2 (B) is an astigmatic diagram of the optical lens 100 at a wavelength of 587.6nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatic curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S, and it can be seen from fig. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2 (C), fig. 2 (C) is a graph showing a distortion curve of the optical lens 100 at a wavelength of 587.6nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 2 (C), the distortion of the optical lens 100 is well corrected at the wavelength of 587.6 nm.

Second embodiment

As shown in fig. 3, the optical lens 100 according to the second embodiment of the present application includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has negative power, the fourth lens L4 has positive power, and the fifth lens L5 has negative power.

Further, the object side surface 11 and the image side surface 12 of the first lens element L1 are concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, at the circumference; the object side surface 31 and the image side surface 32 of the third lens element L3 are convex and concave, respectively, at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

Specifically, taking the effective focal length f=2.32 mm of the optical lens 100, the f-number fno=2.18 of the optical lens 100, the field angle fov= 124.49 ° of the optical lens 100, and the total length ttl=4.05 mm of the optical lens as an example, other parameters of the optical lens 100 are given in table 3 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 3 are all mm. And the refractive index, abbe number, and focal length in Table 3 were obtained at a reference wavelength of 587.6 nm. The higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the second embodiment are given in table 4 below.

TABLE 3 Table 3

TABLE 4 Table 4

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Referring to fig. 4, as shown in fig. 4, the longitudinal spherical aberration curve (a), the astigmatic curve (B) and the distortion curve (C) of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in fig. 4 (a), 4 (B) and 4 (C) may refer to the contents described in the first embodiment in fig. 2 (a), 2 (B) and 2 (C), and will not be repeated here.

Third embodiment

As shown in fig. 5, the optical lens 100 according to the third embodiment of the present application includes a first lens L1, a second lens L2, a stop 102, and a third lens L3 sequentially disposed from an object side to an image side along an optical axis O, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from the object side to the image side along the optical axis O. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has negative power, the fourth lens L4 has positive power, and the fifth lens L5 has negative power.

Specifically, taking the effective focal length f=2.23 mm of the optical lens 100, the f-number fno=2.08 of the optical lens 100, the field angle fov= 127.74 ° of the optical lens 100, and the total length ttl=4.10 mm of the optical lens as an example, other parameters of the optical lens 100 are given in table 5 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 5 are all mm. And the refractive index, abbe number, and focal length in Table 5 were obtained at a reference wavelength of 587.6 nm. The higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical lenses in the third embodiment are given in table 6 below.

TABLE 5

TABLE 6

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Referring to fig. 6, as can be seen from the (a) longitudinal spherical aberration curve, the (B) astigmatic curve, and the (C) distortion curve in fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 (a), 6 (B) and 6 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Fourth embodiment

As shown in fig. 7, the optical lens 100 according to the fourth embodiment of the present application includes a first lens L1, a second lens L2, a stop 102, and a third lens L3 sequentially disposed from an object side to an image side along an optical axis O, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from the object side to the image side along the optical axis O. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has negative power, the fourth lens L4 has negative power, and the fifth lens L5 has positive power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object side surface 21 and the image side surface 22 of the second lens element L2 are convex at a paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region O.

Specifically, taking the effective focal length f=2.23 mm of the optical lens 100, the f-number fno=2.39 of the optical lens 100, the field angle fov= 126.28 ° of the optical lens 100, and the total length ttl=3.90 mm of the optical lens as an example, other parameters of the optical lens 100 are given in table 7 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 7 are all mm. And the refractive index, abbe number, and focal length in Table 7 were obtained at a reference wavelength of 587.6 nm. The higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fourth embodiment are given in table 8 below.

TABLE 7

TABLE 8

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Referring to fig. 8, as shown in fig. 8, the longitudinal spherical aberration curve (a), the astigmatic curve (B) and the distortion curve (C) of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 8 (a), 8 (B) and 8 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Fifth embodiment

As shown in fig. 9, a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application, the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3 sequentially disposed from an object side to an image side along an optical axis O, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from the object side to the image side along the optical axis O. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has negative power, the fourth lens L4 has negative power, and the fifth lens L5 has positive power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object side surface 21 and the image side surface 22 of the second lens element L2 are convex at a paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O; the object side surface 41 and the image side surface 42 of the fourth lens element L4 are concave at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region O.

Further, the object side surface 11 and the image side surface 12 of the first lens element L1 are concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, at the circumference; the object side surface 31 and the image side surface 32 of the third lens element L3 are concave and convex, respectively, at the circumference; the object side surface 41 and the image side surface 42 of the fourth lens element L4 are concave at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

Specifically, taking the effective focal length f=2.46 mm of the optical lens 100, the f-number fno=2.19 of the optical lens 100, the field angle fov= 111.19 ° of the optical lens 100, and the total length ttl=3.78 mm of the optical lens as an example, other parameters of the optical lens 100 are given in table 9 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 9 are all mm. And the refractive index, abbe number, and focal length in Table 9 were obtained at a reference wavelength of 587.6 nm. The following table 10 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fifth embodiment.

TABLE 9

Table 10

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Referring to fig. 10, as can be seen from the (a) longitudinal spherical aberration curve, the (B) astigmatic curve, and the (C) distortion curve in fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 (a), 10 (B) and 10 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Sixth embodiment

As shown in fig. 11, a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present application, the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3 sequentially disposed from an object side to an image side along an optical axis O, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from the object side to the image side along the optical axis O. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has positive power, the fourth lens L4 has positive power, and the fifth lens L5 has negative power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region O.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave, respectively, at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, at the circumference; the object side surface 31 and the image side surface 32 of the third lens element L3 are concave and convex, respectively, at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

Specifically, taking the effective focal length f=2.14 mm of the optical lens 100, the f-number fno=1.99 of the optical lens 100, the field angle fov= 130.72 ° of the optical lens 100, and the total length ttl=3.75 mm of the optical lens as an example, other parameters of the optical lens 100 are given in table 11 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 11 are all mm. And the refractive index, abbe number, and focal length in table 11 were obtained at a reference wavelength of 587.6 nm. The following table 12 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the sixth embodiment.

TABLE 11

Table 12

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Referring to fig. 12, as can be seen from the (a) longitudinal spherical aberration curve chart, (B) astigmatic curve chart and (C) distortion curve chart in fig. 12, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 12 (a), 12 (B) and 12 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Referring to table 13, table 13 is a summary of the ratios of the relationships in the first embodiment to the sixth embodiment of the present application.

TABLE 13

Referring to fig. 13, the present application further discloses an image capturing module 200, which includes a photosensitive chip 201 and the optical lens 100 according to any one of the first to sixth embodiments, where the photosensitive chip 201 is disposed on an image side of the optical lens 100. The optical lens 100 is configured to receive an optical signal of a subject and project the optical signal onto the photosensitive chip 201, and the photosensitive chip 201 is configured to convert the optical signal corresponding to the subject into an image signal, which is not described herein. It can be appreciated that the image capturing module 200 with the optical lens 100 can achieve an ultra-wide angle imaging effect on the basis of the miniaturization and the light-weight design of the optical lens, so as to improve the imaging quality of the optical lens 100. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

Referring to fig. 14, the present application further discloses an electronic device 300, where the electronic device 300 includes a housing 301 and the above-mentioned camera module 200, and the camera module 200 is disposed in the housing 301. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, a vehicle recorder, a back image, etc. It can be appreciated that the electronic device 300 having the image capturing module 200 also has all the technical effects of the optical lens 100. That is, on the basis of the design of miniaturization and thinness of the optical lens, the ultra-wide angle imaging effect can be achieved, so that the imaging quality of the optical lens 100 can be improved. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present application are described in detail, and specific examples are applied to the description of the principles and the implementation manners of the present application, where the description of the above embodiments is only used to help understand the optical lens, the camera module, the electronic device and the core ideas of the present application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the contents of the present specification should not be construed as limiting the present application in summary.

Claims

1. An optical lens, characterized in that the optical lens has five lenses with optical power, and the five lenses comprise a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis;

the first lens is provided with positive focal power, and the object side surface and the image side surface of the first lens are respectively convex and concave at a paraxial region;

the third lens has optical power;

the optical lens satisfies the following relation:

1.2 < SD11/SD21 < 1.6, 85 ° < FOV IMGH/TTL < 110 °;

wherein SD11 is the maximum effective half caliber of the object side surface of the first lens, SD21 is the maximum effective half caliber of the object side surface of the second lens, FOV is the maximum field angle of the optical lens, TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and IMGH is half of the image height corresponding to the maximum field angle of the optical lens.

2. The optical lens of claim 1, wherein: the optical lens satisfies the following relation:

0.8＜|f4/R42|＜8.8；

3. The optical lens of claim 1, wherein: the optical lens satisfies the following relation:

0.32mm＜CT1+CT12＜0.45mm；

wherein CT1 is the thickness of the first lens element on the optical axis, and CT12 is the distance between the image side of the first lens element and the object side of the second lens element on the optical axis.

4. The optical lens of claim 1, wherein: the optical lens satisfies the following relation:

1.0＜|f1/f5|＜17；

5. The optical lens of claim 1, wherein: the optical lens satisfies the following relation:

0.18＜FFL/TTL＜0.24；

wherein FFL is the shortest distance from the image side surface of the fifth lens to the imaging surface of the optical lens in the optical axis direction.

6. The optical lens of claim 1, wherein: the optical lens satisfies the following relation:

0.52＜SD51/IMGH＜0.78；

7. The optical lens of claim 1, wherein: the optical lens satisfies the following relation:

1.4＜f23/f＜2.2；

8. A camera module, its characterized in that: the camera module comprises a photosensitive chip and the optical lens as claimed in any one of claims 1 to 7, wherein the photosensitive chip is arranged on the image side of the optical lens.

9. An electronic device, characterized in that: the electronic equipment comprises a shell and the camera module set according to claim 8, wherein the camera module set is arranged on the shell.