CN115480371A

CN115480371A - Optical lens, camera module and electronic equipment

Info

Publication number: CN115480371A
Application number: CN202211027729.9A
Authority: CN
Inventors: 邓嘉伟; 刘彬彬
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-12-16

Abstract

The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens sequentially comprises from an object side to an image side along an optical axis: the first lens element with negative refractive power has a concave object-side surface and a convex image-side surface at paraxial region, respectively; a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface at paraxial region, respectively; a third lens element with refractive power having a convex image-side surface at paraxial region; a fourth lens element with refractive power having a convex image-side surface at paraxial region; a fifth lens element with refractive power having a concave object-side surface at paraxial region; a sixth lens element with refractive power having a convex object-side surface at paraxial region; a seventh lens element with refractive power having a convex object-side surface and a concave image-side surface at paraxial region, respectively; the optical lens satisfies the relation: 16mm ² <IMGH^2/FNO<18mm ² . The optical lens, the camera module and the electronic equipment provided by the invention can meet the design requirement of miniaturization while ensuring the imaging quality.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the development and development of the society, people have higher and higher requirements on the shooting capability of electronic equipment, and meanwhile, with the development and popularization of mobile electronic equipment, electronic equipment in the market has a development trend of small size and light weight, so that the optical lens is required to meet the requirements of high imaging quality and simultaneously take consideration of the design of small size and light weight, and thus, the space is saved for other parts.

Therefore, how to arrange parameters such as the number of lenses and the surface shape of the optical lens to achieve a smaller and lighter image pickup module and obtain a higher quality image quality as much as possible becomes a problem to be solved.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the design requirement of miniaturization while ensuring the imaging quality.

In order to achieve the above object, according to a first aspect of the present invention, there is provided an optical lens system, comprising seven lens elements with refractive power, in order from an object side to an image side along an optical axis:

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

a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface;

a third lens element with refractive power having a convex image-side surface at paraxial region;

a fourth lens element with refractive power having a convex image-side surface at paraxial region;

a fifth lens element with refractive power having a concave object-side surface at paraxial region;

a sixth lens element with refractive power having a convex object-side surface at paraxial region;

a seventh lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the optical lens satisfies the following relation:

16mm ² <IMGH^2/FNO<18mm ² ；

wherein IMGH is the radius of the maximum effective imaging circle of the optical lens (i.e. the image height of the optical lens), and FNO is the f-number of the optical lens.

The first lens of the optical lens is limited to have negative refractive power, and the deflection angle of light rays can be increased by combining the design that the object side surface and the image side surface of the first lens are respectively concave and convex at a paraxial region so as to enlarge the field angle of the optical lens; the second lens has positive refractive power, can balance aberration generated by light rays passing through the first lens, and corrects the aberration so as to improve the imaging quality of the optical lens, and the arrangement that the object side surface and the image side surface of the second lens are respectively convex and concave at the position close to the optical axis enables incident light rays passing through the first lens to enter the optical lens more smoothly, thereby being beneficial to correcting off-axis aberration, reducing the resolution change sensitivity of the optical lens, enhancing the stability of the imaging effect of the optical lens, and improving the imaging quality of the optical lens; the arrangement that the image side surfaces of the third lens and the fourth lens are convex surfaces at the position of a paraxial region is favorable for correcting the coma aberration of the optical lens so as to improve the imaging resolution of the optical lens and further improve the imaging quality of the optical lens; the object side surface of the fifth lens is a concave surface at a paraxial region, so that the deflection angle of incident light can be properly increased, and the field angle of the optical lens can be enlarged, so that the effect of enlarging the imaging circle of the optical lens can be achieved, meanwhile, the path of the optical lens projected in the optical axis direction can be shortened, the total length of the optical lens can be further controlled, and the miniaturization design of the optical lens is facilitated; the object side surface of the sixth lens is convex at a paraxial region, so that marginal field rays can be effectively converged to correct marginal field aberration generated when incident rays pass through the first lens to the fifth lens, and meanwhile, reasonable configuration of an air gap between the front lens and the rear lens is facilitated, and the risk of ghost images is reduced; the object-side surface of the seventh lens element is convex at a paraxial region thereof, and the image-side surface thereof is concave at a paraxial region thereof, and the positive or negative refractive power configuration of the seventh lens element can balance the aberrations, which are difficult to correct, generated by the first to sixth lens elements, thereby promoting the aberration balance of the optical lens assembly, and further improving the resolving power of the optical lens assembly, and improving the imaging quality of the optical lens assembly.

Further, the optical lens satisfies 16mm ² <IMGH^2/FNO<18mm ² The radius and the f-number of the maximum effective imaging circle of the optical lens are reasonably configured, so that the optical lens has a smaller size along the direction perpendicular to the optical axis, the miniaturization design of the optical lens is facilitated, and meanwhile, the f-number of the optical lens is limited, so that the optical lens has a larger-size aperture, the large-aperture characteristic of the optical lens is facilitated, and the imaging quality of the optical lens in a dark light environment is improved.

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

2.5<FNO*TTL/IMGH<2.8；

wherein, TTL is a distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens system (i.e., a total length of the optical lens system).

The total length, the diaphragm number and the image height of the optical lens are reasonably configured, so that the total length of the optical lens can be shortened, the miniaturization of the optical lens is facilitated, meanwhile, the light transmission quantity of the optical lens can be ensured, the relative illumination of the optical lens is improved, the optical lens can adapt to the shooting condition of dim light, the edge aberration of the optical lens is reduced, and the imaging quality of the optical lens is improved.

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

4.5mm<DL/(FNO*cos(HFOV))<5.0mm；

wherein DL is a distance on the optical axis from an object-side surface of the first lens to an image-side surface of the seventh lens, and the HFOV is a half of a maximum field angle of the optical lens.

It can be understood that when the small field angle is matched with the large aperture, the design difficulty is increased, and the tolerance sensitivity is increased along with the further expansion of the aperture of the lens, which is not beneficial to the assembly and the processing forming of each lens; when a large field angle is matched with a small aperture, the relative illumination of the marginal field of the optical lens is insufficient, the resolution of the optical lens is reduced, and the imaging quality of the optical lens is reduced. Therefore, when the relation is satisfied, the optical lens has the characteristic of a large aperture, and simultaneously, seven lenses are reasonably arranged, so that the total length of the optical lens is shortened, the miniaturization of the optical lens is facilitated, and meanwhile, the characteristics of a large field angle and the large aperture can be considered, so that the design difficulty is reduced, and the imaging quality of the optical lens is improved.

1.2 sP 2/f <1.6; and/or-34 < (R11 + R12)/(R11-R12) < -10;

wherein f is a focal length of the optical lens, f2 is a focal length of the second lens element, R11 is a curvature radius of the object-side surface of the first lens element on the optical axis, and R12 is a curvature radius of the image-side surface of the first lens element on the optical axis.

By limiting the ratio of the focal length of the second lens element to the focal length of the optical lens, the refractive power distribution of the second lens element in the optical lens can be configured reasonably to support the large field angle characteristic of the optical lens and balance the aberration introduction amount of the optical lens, thereby avoiding the problem of poor surface shape of the front lens group (i.e. the first lens element and the second lens element) caused by the large field angle and the diaphragm arranged in the middle of the optical lens, facilitating the correction of the aberration of the optical lens and improving the imaging quality of the optical lens.

In addition, through the object side of restraint first lens and the radius of curvature of image side, the object side that can effective control first lens and the crooked degree and the thickness ratio trend of image side, so that the shape of first lens is smooth even, thereby can reduce the processing degree of difficulty and the equipment sensitivity of first lens, be favorable to the manufacturing shaping and the equipment of first lens, and simultaneously, the image plane center is clear even to marginal whole formation of image picture quality, can effectively reduce the risk that the ghost image produced, promote optical lens's resolving power, thereby improve optical lens's image quality.

-12<SD51/SAG51<-3；

wherein SD51 is the maximum effective semi-aperture of the object-side surface of the fifth lens, and SAG51 is the distance in the direction parallel to the optical axis from the maximum effective aperture of the object-side surface of the fifth lens to the intersection of the object-side surface of the fifth lens and the optical axis (i.e., the rise of the sagittal height at the maximum effective semi-aperture of the object-side surface of the fifth lens).

The ratio of the maximum effective half aperture of the object side surface of the fifth lens to the rise of the maximum effective half aperture can be limited, so that the fifth lens has a large aperture, the light flux of the optical lens is increased, the relative illumination of the optical lens is improved, and the imaging quality of the optical lens is improved. Meanwhile, the bending degree of the object side surface of the fifth lens can be restrained, so that the thickness ratio of the fifth lens is uniform, deflection of light rays at the edge visual angle can be reduced, the imaging quality of the optical lens is improved, the fifth lens has good manufacturability, the risk of mold forming is reduced, and the fifth lens is beneficial to processing and forming.

1.2<(CT34+CT45+CT56+CT67)/BFL<2.5；

wherein, CT34 is a distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element on the optical axis (i.e. an air gap between the third lens element and the fourth lens element), CT45 is a distance between the image-side surface of the fourth lens element and an object-side surface of the fifth lens element on the optical axis (i.e. an air gap between the fourth lens element and the fifth lens element), CT56 is a distance between the image-side surface of the fifth lens element and an object-side surface of the sixth lens element on the optical axis (i.e. an air gap between the fifth lens element and the sixth lens element), CT67 is a distance between the image-side surface of the sixth lens element and an object-side surface of the seventh lens element on the optical axis (i.e. an air gap between the sixth lens element and the seventh lens element), and BFL is a minimum distance between the image-side surface of the seventh lens element and an image-side surface of the optical lens element in a direction parallel to the optical axis (i.e. a back focus of the optical lens element).

The space between the lenses can be effectively controlled by limiting the ratio of the air gap of the rear lens group (namely, the third lens to the seventh lens) to the rear focal length of the optical lens, the space compactness of the optical lens is improved, and the optical lens obtains a larger rear focal length, so that the optical lens has stronger flexibility in structural arrangement, and the miniaturization design of the optical lens can be met while the assembling difficulty is taken into consideration. In addition, by limiting the back focal length of the optical lens, the incident angle of the light rays entering the imaging plane of the optical lens can be controlled to correct distortion and image plane curvature, so that the imaging quality of the optical lens is improved.

-4.5<SAG72/ET7<-0.5；

wherein SAG72 is a distance in a direction parallel to the optical axis from a maximum effective aperture of an image-side surface of the seventh lens to an intersection point of the image-side surface of the seventh lens and the optical axis (i.e., a rise at a maximum effective semi-aperture of the image-side surface of the seventh lens), and ET7 is a distance in the direction parallel to the optical axis from the maximum effective semi-aperture of an object-side surface of the seventh lens to the maximum effective semi-aperture of the image-side surface of the seventh lens (i.e., an edge thickness of the seventh lens).

By restricting the ratio of the rise of the maximum effective semi-aperture position of the image side surface of the seventh lens to the edge thickness of the seventh lens, the bending degree of the seventh lens can be controlled, the excessive reverse bending of the shape of the seventh lens is avoided, the machinability of the seventh lens is ensured, meanwhile, the deflection angle of light rays can be reduced, the risk that ghost images are formed by the reflection of the light rays at the effective semi-aperture position of the seventh lens is reduced, the sensitivity of the optical lens is reduced, and the imaging quality of the optical lens is improved.

6.5< | f1/f7| <48.5; and/or 1< -R71/R72 <3;

wherein f1 is a focal length of the first lens element, f7 is a focal length of the seventh lens element, R71 is a radius of curvature of an object-side surface of the seventh lens element on the optical axis, and R72 is a radius of curvature of an image-side surface of the seventh lens element on the optical axis.

By restricting the ratio of the focal length of the first lens and the focal length of the seventh lens, the refractive power of the first lens and the refractive power of the seventh lens can be reasonably configured, the light convergence capacity of the optical lens is improved, the focus point of light on the imaging surface is adjusted, the aperture of the optical lens is increased, the relative illumination of the edge field of view of the imaging surface is improved, the risk of dark corner generation is reduced, and the imaging quality of the optical lens is improved.

In addition, by reasonably configuring the ratio of the curvature radius of the object-side surface and the curvature radius of the image-side surface of the seventh lens element, the curvature degree and the thickness ratio trend of the object-side surface and the curvature radius of the image-side surface of the seventh lens element can be effectively controlled to limit the shape change of the seventh lens element, so that on one hand, the spherical aberration contribution of the seventh lens element can be controlled within a reasonable range to avoid the imaging quality of the on-axis field and the off-axis field from being significantly reduced due to the influence of the spherical aberration, thereby effectively improving the spherical aberration of the optical lens and improving the imaging quality of the optical lens, on the other hand, the surface type complexity of the seventh lens element can be reduced, the machinability of the seventh lens element can be improved, the risk of the optical lens element that the imaging quality is reduced due to poor processing and forming can be reduced, and the imaging quality of the optical lens element can be ensured.

In a second aspect, the present invention discloses a camera module, which includes an image sensor and the optical lens of the first aspect, wherein the image sensor is disposed on the image side of the optical lens. The camera module with the optical lens meets the design requirement of miniaturization while ensuring the imaging quality.

In a third aspect, the present invention discloses an electronic device, which includes a housing and the camera module set according to the second aspect, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module meets the design requirement of miniaturization while ensuring the imaging quality.

Compared with the prior art, the invention has the beneficial effects that:

according to the optical lens, the camera module and the electronic device, the first lens of the optical lens has negative refractive power, and the deflection angle of light rays can be increased by combining the design that the object side surface and the image side surface of the first lens are respectively concave and convex at the paraxial region so as to enlarge the field angle of the optical lens; the second lens has positive refractive power, can balance aberration generated by light rays through the first lens, and corrects the aberration so as to improve the imaging quality of the optical lens, and the arrangement that the object side surface and the image side surface of the second lens are respectively a convex surface and a concave surface at a paraxial region is matched, so that incident light rays through the first lens can enter the optical lens more smoothly, the off-axis aberration can be corrected, the resolution change sensitivity of the optical lens is reduced, the stability of the imaging effect of the optical lens is enhanced, the imaging quality of the optical lens is improved, and meanwhile, the total length of the optical lens can be shortened so as to meet the miniaturization requirement of the optical lens; the image side surfaces of the third lens and the fourth lens are convex at the position close to the optical axis, which is beneficial to correcting coma aberration of the optical lens so as to improve the imaging resolution of the optical lens and further improve the imaging quality of the optical lens; the object side surface of the fifth lens is a concave surface at a paraxial region, so that the deflection angle of incident light can be properly increased, and the field angle of the optical lens can be enlarged, so that the effect of enlarging the imaging circle of the optical lens can be achieved, meanwhile, the path of the optical lens projected in the optical axis direction can be shortened, the total length of the optical lens can be further controlled, and the miniaturization design of the optical lens is facilitated; the object side surface of the sixth lens is a convex surface at a paraxial region, so that marginal field rays can be effectively converged to correct marginal field aberration generated when incident rays pass through the first lens and the fifth lens, and meanwhile, reasonable configuration of an air gap between the front lens and the rear lens is facilitated, and the risk of ghost images is reduced; the object-side surface of the seventh lens element is convex at a paraxial region thereof, and the image-side surface thereof is concave at a paraxial region thereof, and the positive or negative refractive power configuration of the seventh lens element can balance the aberrations, which are difficult to correct, generated by the first to sixth lens elements, thereby promoting the aberration balance of the optical lens assembly, and further improving the resolving power of the optical lens assembly, and improving the imaging quality of the optical lens assembly.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used 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 invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

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

fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

fig. 4 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 8 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 11 is a schematic structural diagram of the camera module disclosed in the present application;

fig. 12 is a schematic structural diagram of an electronic device disclosed in the present application.

Detailed Description

The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1, according to a first aspect of the present application, the present application discloses an optical lens 100, and the optical lens 100 includes seven lens elements with refractive power, including a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and a seventh lens element L7, which are 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, the fifth lens L5, the sixth lens L6, and the seventh lens L7 in sequence from the object side of the first lens L1, and finally forms an image on the image plane 101 of the optical lens 100. The first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with refractive power, the fourth lens element L4 with refractive power, the fifth lens element L5 with refractive power, the sixth lens element L6 with refractive power, and the seventh lens element L7 with refractive power.

Further, the object-side surface 11 of the first lens element L1 is concave at the paraxial region O, and the image-side surface 12 of the first lens element L1 is convex at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex at the paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region O; the object-side surface 31 of the third lens element L3 is concave or convex at the paraxial region O, and the image-side surface 32 of the third lens element L3 is convex at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is concave or convex at the paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is concave at the paraxial region O, and the image-side surface 52 of the fifth lens element L5 is concave or convex at the paraxial region O; the object-side surface 61 of the sixth lens element L6 is convex at the paraxial region O, and the image-side surface 62 of the sixth lens element L6 is concave or convex at the paraxial region O; the object-side surface 71 of the seventh lens element L7 is convex at the paraxial region O, and the image-side surface 72 of the seventh lens element L7 is concave at the paraxial region O.

By properly arranging the surface shapes and refractive powers of the lenses between the first lens element L1 and the seventh lens element L7, the optical lens system 100 can satisfy the design requirement of miniaturization while ensuring the imaging quality.

Further, in some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all made of plastic, and in this case, the optical lens 100 can reduce the weight and the cost. In other embodiments, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 may be made of glass, so that the optical lens 100 has a good optical effect and the temperature drift sensitivity of the optical lens 100 can be reduced.

In some embodiments, for convenience of processing and molding, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 may all be aspheric lenses. It is to be understood that in other embodiments, spherical lenses may be used for the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7.

In some embodiments, the optical lens 100 further includes a stop STO, which may be an aperture stop and/or a field stop, for example, the stop STO may be an aperture stop, or the stop STO may be a field stop, or the stop STO may be an aperture stop and a field stop. By providing the stop STO between the second lens L2 and the third lens L3, the exit pupil can be made distant from the imaging plane 101, and the effective diameter of the optical lens 100 can be reduced without reducing the telecentricity of the optical lens 100, thereby achieving miniaturization. It is understood that in other embodiments, the stop STO can be disposed between other lenses, and the arrangement is adjusted according to the actual situation, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 further includes an infrared filter 80, and the infrared filter 80 is disposed between the seventh lens element L7 and the image plane 101 of the optical lens 100. The infrared filter 80 is selected for use, so that infrared light can be filtered, imaging is more in line with visual experience of human eyes, and imaging quality is improved. It is understood that the infrared filter 80 may be made of plastic, or made of an optical glass coating, or the infrared filter 80 made of other materials, which may be selected according to actual needs, and is not limited in this embodiment.

In other embodiments, the infrared filter 80 can also filter out light in other bands, such as visible light, and only let infrared light pass through, so that the optical lens 100 can image in a dark environment or a special application scene and obtain better imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 16mm ² <IMGH^2/FNO<18mm ² For example IMGH ^2/FNO =16.110mm ² 、16.122mm ² 、16.153mm ² 、16.201mm ² 、16.358mm ² 、16.512mm ² 、17.12 6mm ² 、17.564mm ² 、17.842mm ² Or 17.950mm ² And the like. Wherein IMGH is the radius of the maximum effective imaging circle of the optical lens 100 (i.e. the image height of the optical lens 100), and FNO is lightThe f-number of the optical lens 100.

By reasonably configuring the radius and the f-number of the maximum effective imaging circle of the optical lens 100, the optical lens 100 can have a smaller size in the direction perpendicular to the optical axis O, which is beneficial to the miniaturization design of the optical lens 100, and meanwhile, by limiting the f-number of the optical lens 100, the optical lens 100 can have a larger size aperture, so as to be beneficial to realizing the large aperture characteristic of the optical lens 100, thereby improving the imaging quality of the optical lens 100 in a dark light environment.

In some embodiments, the optical lens 100 satisfies the following relationship: 2.5 quarter FNO TTL/IMGH <2.8, for example FNO TTL/IMGH =2.512, 2.526, 2.538, 2.547, 2.553, 2.745, 2.756, 2.771, 2.786, or 2.795, etc. Wherein, TTL is a distance on the optical axis O from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens system 100 (i.e., the total length of the optical lens system 100).

By reasonably configuring the total length, f-number and image height of the optical lens 100, the total length of the optical lens 100 can be shortened to facilitate miniaturization of the optical lens 100, and at the same time, the light flux of the optical lens 100 can be ensured, the relative illumination of the optical lens 100 can be improved, so that the optical lens 100 can adapt to the shooting condition of dark light, and the edge aberration of the optical lens 100 can be reduced, thereby improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 4.5mm plus DL/(FNO × cos (HFOV)) <5.0mm, for example DL/(FNO × cos (HFOV)) =4.510mm, 4.522mm, 4.546mm, 4.556mm, 4.598mm, 4.854mm, 4.867mm, 4.882mm, 4.912mm or 4.986mm, etc. Where DL is a distance on the optical axis O from the object-side surface 11 of the first lens L1 to the image-side surface 72 of the seventh lens L7, and HFOV is half of the maximum field angle of the optical lens 100.

It can be understood that when the small field angle is matched with the large aperture, the design difficulty is increased, and the tolerance sensitivity is increased along with the further expansion of the aperture of the lens, which is not beneficial to the assembly and the processing forming of each lens; when a large field angle is matched with a small aperture, the relative illuminance of the marginal field of the optical lens 100 is insufficient, and the resolving power of the optical lens 100 is reduced, thereby causing the image quality of the optical lens 100 to be degraded. Therefore, when the above relational expression is satisfied, seven lenses can be reasonably arranged while the optical lens 100 has a large aperture characteristic, so as to shorten the total length of the optical lens 100, which is beneficial to realizing miniaturization of the optical lens 100, and simultaneously, the characteristics of a large field angle and a large aperture can be considered, so as to reduce the design difficulty and improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2< -f2/f <1.6, such as f2/f =1.215, 1.260, 1.274, 1.398, 1.346, 1.382, 1.401, 1.415, 1.586, 1.591, etc. Where f is the focal length of the optical lens 100, and f2 is the focal length of the second lens L2.

By limiting the ratio of the focal length of the second lens element L2 to the focal length of the optical lens system 100, the refractive power distribution of the second lens element L2 in the optical lens system 100 can be configured reasonably to support the large field angle characteristic of the optical lens system 100 and balance the aberration introduction amount of the optical lens system 100, so as to avoid the problem of poor surface profile of the front lens group (i.e. the first lens element L1 and the second lens element L2) caused by the large field angle and the stop STO disposed in the middle of the optical lens system 100, thereby facilitating the correction of the aberration of the optical lens system 100 and improving the imaging quality of the optical lens system 100.

In some embodiments, the optical lens 100 satisfies the following relationship: -12 straw SD51/SAG51< -3, such as SD51/SAG51= -11.860, -11.524, -5.482, -11.312, -11.256, -11.212, -3.739, -3.506, -3.324 or-3.157, etc. Where SD51 is the maximum effective semi-aperture of the object-side surface 51 of the fifth lens L5, and SAG51 is the distance in the direction parallel to the optical axis O from the maximum effective aperture of the object-side surface 51 of the fifth lens L5 to the intersection of the object-side surface 51 of the fifth lens L5 and the optical axis O (i.e., the rise of the vector at the maximum effective semi-aperture of the object-side surface 51 of the fifth lens L5).

By limiting the ratio of the maximum effective half aperture of the object-side surface 51 of the fifth lens L5 to the rise at the maximum effective half aperture, the fifth lens L5 can have a sufficiently large aperture to increase the light flux of the optical lens 100, improve the relative illumination of the optical lens 100, and thereby improve the imaging quality of the optical lens 100. Meanwhile, the bending degree of the object side surface 51 of the fifth lens L5 can be restrained, so that the thickness ratio of the fifth lens L5 is uniform, deflection of light rays at the edge viewing angle can be reduced, the imaging quality of the optical lens 100 is improved, the fifth lens L5 has good manufacturability, the risk of mold forming is reduced, and the processing and forming of the fifth lens L5 are facilitated.

In some embodiments, the optical lens 100 satisfies the following relationship: -34< (R11 + R12)/(R11-R12) < -10, for example, (R11 + R12)/(R11-R12) = -33.621, -33.135, -32.974, -32.486, -32.256, -12.334, -12.160, -11.654, -11.069 or-10.461, etc. Wherein, R11 is a curvature radius of the object-side surface 11 of the first lens element L1 at the optical axis O, and R12 is a curvature radius of the image-side surface 12 of the first lens element L1 at the optical axis O.

Through the curvature radius of the object side surface 11 and the image side surface 12 of the constraint first lens L1, the curvature degree and thickness ratio trend of the object side surface 11 and the image side surface 12 of the first lens L1 can be effectively controlled, so that the shape of the first lens L1 is smooth and uniform, the processing difficulty and the assembly sensitivity of the first lens L1 can be reduced, the manufacturing molding and the assembly of the first lens L1 are facilitated, meanwhile, the overall imaging image quality from the center of the imaging surface 101 to the edge is clear and uniform, the risk of ghost image generation can be effectively reduced, the image resolving capability of the optical lens 100 is improved, and the imaging quality of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2< (CT 34+ CT45+ CT56+ CT 67)/BFL <2.5, e.g., (CT 34+ CT45+ CT56+ CT 67)/BFL =1.224, 1.268, 1.297, 1.310, 1.375, 1.399, 2.405, 2.446, 2.473, or 2.481, etc. Wherein, CT34 is a distance on the optical axis O from the image-side surface 32 of the third lens element L3 to the object-side surface 41 of the fourth lens element L4 (i.e., an air gap between the third lens element L3 and the fourth lens element L4), CT45 is a distance on the optical axis O from the image-side surface 42 of the fourth lens element L4 to the object-side surface 51 of the fifth lens element L5 (i.e., an air gap between the fourth lens element L4 and the fifth lens element L5), CT56 is a distance on the optical axis O from the image-side surface 52 of the fifth lens element L5 to the object-side surface 61 of the sixth lens element L6 (i.e., an air gap between the fifth lens element L5 and the sixth lens element L6), CT67 is a distance on the optical axis O from the image-side surface 62 of the sixth lens element L6 to the object-side surface 71 of the seventh lens element L7 (i.e., an air gap between the sixth lens element L6 and the seventh lens element L7), and BFL is a minimum distance on the optical axis O from the image-side surface 72 of the seventh lens element L7 to the imaging surface 101 of the optical lens element 100 (i.e., a back focal length of the optical lens element 100.

By limiting the ratio of the air gap of the rear lens group (i.e., the third lens L3 to the seventh lens L7) to the rear focal length of the optical lens 100, the distance between the lenses can be effectively controlled, the space compactness of the optical lens 100 is improved, and the optical lens 100 obtains a larger rear focal length, so that the optical lens 100 has stronger flexibility in structural arrangement, and the miniaturization design of the optical lens 100 can be satisfied while the assembly difficulty is taken into account. In addition, by limiting the back focal length of the optical lens 100, the incident angle of the light entering the imaging plane 101 by the optical lens 100 can be controlled to correct distortion and field curvature, thereby improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: -4.5< -SAG 72/ET7< -0.5, such as SAG72/ET7= -4.485, -4.426, -4.407, -4.368, -4.255, -0.846, -7.551, -0.645, -0.588, or-0.517 and the like. Here, SAG72 is a distance in a direction parallel to the optical axis O from a maximum effective aperture of the image-side surface 72 of the seventh lens L7 to an intersection of the image-side surface 72 of the seventh lens L7 and the optical axis O (i.e., a sagittal height at the maximum effective half aperture of the image-side surface 72 of the seventh lens L7), and ET7 is a distance in a direction parallel to the optical axis O from a maximum effective half aperture of the object-side surface 71 of the seventh lens L7 to a maximum effective half aperture of the image-side surface 72 of the seventh lens L7 (i.e., an edge thickness of the seventh lens L7).

By restricting the ratio of the rise of the maximum effective semi-aperture position of the image-side surface 72 of the seventh lens L7 to the edge thickness of the seventh lens L7, the bending degree of the seventh lens L7 can be controlled, and the seventh lens L7 is prevented from being excessively bent in shape, so as to ensure the processability of the seventh lens L7, and meanwhile, the deflection angle of light can be reduced, and the risk that ghost images are formed by the light reflected at the effective semi-aperture position of the seventh lens L7 is reduced, thereby being beneficial to reducing the sensitivity of the optical lens 100 and improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 6.5< | f1/f7| <48.5, for example, | f1/f7| =6.542, 6.610, 6.745, 6.884, 6.923, 48.128, 48.225, 48.341, 48.398, or 48.463, and the like. Where f1 is the focal length of the first lens L1, and f7 is the focal length of the seventh lens L7.

By restricting the ratio of the focal length of the first lens element L1 to the focal length of the seventh lens element L7, the refractive powers of the first lens element L1 and the seventh lens element L7 can be reasonably configured, so as to improve the light converging capability of the optical lens 100, adjust the focus point of the light on the imaging plane 101, increase the aperture of the optical lens 100, improve the relative illumination of the edge field of the imaging plane 101, reduce the risk of dark angle generation, and improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< -R71/R72 <3, for example R71/R72=1.050, 1.130, 1.270, 1.460, 1.710, 2.891, 2.910, 2.934, 2.955 or 2.972 etc. Where R71 is a curvature radius of the object-side surface 71 of the seventh lens element L7 on the optical axis O, and R72 is a curvature radius of the image-side surface 72 of the seventh lens element L7 on the optical axis O.

By reasonably configuring the ratio of the curvature radii of the object-side surface 71 and the image-side surface 72 of the seventh lens L7, the curvature degree and the thickness ratio trend of the object-side surface 71 and the image-side surface 72 of the seventh lens L1 can be effectively controlled to limit the shape change of the seventh lens L7, so that on one hand, the spherical aberration contribution of the seventh lens L7 can be controlled within a reasonable range to avoid the imaging quality of the on-axis field of view and the off-axis field of view from being significantly reduced due to the influence of the spherical aberration, thereby effectively improving the spherical aberration of the optical lens 100 and improving the imaging quality of the optical lens 100, and on the other hand, the surface type complexity of the seventh lens L7 is favorably reduced, the processability of the seventh lens L7 is improved, the risk of the optical lens 100 that the imaging quality is reduced due to poor processing and molding is reduced, and the imaging quality of the optical lens 100 is ensured.

In addition, the object-side surface and the image-side surface of any one of the first lens L1 to the seventh lens L7 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, c =1/Y, Y is the radius of curvature (i.e., paraxial curvature c is the reciprocal of the radius of Y in table 1), k is the conic constant, and Ai is the coefficient corresponding to the higher order term in the aspheric surface type formula.

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

First embodiment

Fig. 1 shows a schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application, where the optical lens 100 includes a first lens element L1, a second lens element L2, a stop STO, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an infrared filter 80, which are sequentially disposed from an object side to an image side along an optical axis O. For materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7, reference is made to the above detailed description, and details thereof are omitted here.

Further, the first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with negative refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively concave and convex at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are respectively 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 concave and convex, respectively, at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex at the paraxial region O; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave, respectively, at a paraxial region O.

Specifically, taking as an example that the focal length f =5.20mm of the optical lens 100, the f-number FNO =1.98 of the optical lens 100, the maximum field angle FOV =95.15deg of the optical lens 100, and the total length TTL =8.00mm of the optical lens 100, other parameters of the optical lens 100 are given by table 1 below. The elements from the object side to the image side along the optical axis O of the optical lens 100 are sequentially arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 correspond to the object side surface and the image side surface of the first lens L1, respectively. The Y radius in table 1 is the curvature radius of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop STO in the "thickness" parameter column is the distance on the optical axis O from the stop STO to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side surface of the first lens L1 to the image side surface of the last lens is defined as the positive direction of the optical axis O, when the value is negative, it indicates that the stop STO is arranged on the image side of the vertex of the next surface, and if the thickness of the stop STO is a positive value, the stop STO is arranged on the object side of the vertex of the next surface. It is understood that the units of the radius Y, the thickness, and the focal length in table 1 are all mm, and the refractive index, the abbe number, and the focal length in table 1 are all obtained at the reference wavelength 587 nm.

K in table 2 is a conic constant, and table 2 gives coefficients of high-order terms A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the first embodiment.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration diagram of the optical lens 100 in the first embodiment at wavelengths of 650.00nm, 610.00nm, 587.56nm, 510.00nm and 470.00 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift in mm, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which indicates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a graph of astigmatism of the optical lens 100 in the first embodiment at a wavelength of 587.56 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. In the astigmatism graph, T represents the curvature of the imaging plane 101 in the meridional direction, and S represents the curvature of the imaging plane 101 in the sagittal direction, and it can be seen from (B) in fig. 2 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 2 (C), fig. 2 (C) is a graph illustrating a distortion curve of the optical lens 100 of the first embodiment at a wavelength of 587.56 nm. 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 (C) in fig. 2, the distortion of the optical lens 100 is well corrected at this wavelength.

Second embodiment

A schematic structural diagram of an optical lens 100 disclosed in the second embodiment of the present application is shown in fig. 3, where the optical lens 100 includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are sequentially disposed from an object side to an image side along an optical axis O. For materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7, reference is made to the above detailed description, and details thereof are omitted here.

Further, the first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with negative refractive power and the seventh lens element L7 with negative refractive power are shown.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex, respectively, at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are 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, respectively, at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively convex and concave at the paraxial region O; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave, respectively, near the optical axis O.

Specifically, the focal length f =5.23mm of the optical lens 100, the f-number FNO =1.99 of the optical lens 100, the maximum field angle FOV =94.29deg of the optical lens 100, and the total length TTL =7.95mm of the optical lens 100 are taken as examples.

Other parameters in the second embodiment are given in table 3 below, and the definitions of the parameters can be obtained from the description of the previous embodiment, which is not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 3 are all mm, and the refractive index, the abbe number, and the focal length in table 3 are all obtained at the reference wavelength 587 nm.

K in table 4 is a conic constant, and table 4 gives high-order coefficient values A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical mirror surfaces in the second embodiment.

TABLE 3

TABLE 4

Referring to fig. 4, as can be seen from the longitudinal spherical aberration diagram (a) in fig. 4, the astigmatism diagram (B) in fig. 4, and the distortion diagram (C) in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Third embodiment

A schematic structural diagram of an optical lens 100 disclosed in the third embodiment of the present application is shown in fig. 5, where the optical lens 100 includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are sequentially disposed from an object side to an image side along an optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.

Further, the first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with negative refractive power and the seventh lens element L7 with positive refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively concave and convex at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively 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, respectively, at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively convex and concave at the paraxial region O; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave, respectively, near the optical axis O.

Specifically, the focal length f =4.69mm of the optical lens 100, the f-number FNO =1.96 of the optical lens 100, the maximum field angle FOV =99.51deg of the optical lens 100, and the total length TTL =7.85mm of the optical lens 100 are taken as examples.

Other parameters in the third embodiment are given in table 5 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 5 are all mm, and the refractive index, the abbe number, and the focal length in table 5 are all obtained at the reference wavelength 587 nm.

K in table 6 is a conic constant, and table 6 gives coefficients of high-order terms A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the third embodiment.

TABLE 5

TABLE 6

Referring to fig. 6, as can be seen from the longitudinal spherical aberration diagram (a) in fig. 6, the astigmatism diagram (B) in fig. 6, and the distortion diagram (C) 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 this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fourth embodiment

A schematic structural diagram of an optical lens 100 disclosed in the fourth embodiment of the present application is shown in fig. 7, where the optical lens 100 includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are sequentially disposed from an object side to an image side along an optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.

Further, the first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with negative refractive power are disposed in the lens module.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively concave and convex at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex, respectively, at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are respectively 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 respectively concave and convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex at the paraxial region O; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave, respectively, near the optical axis O.

Specifically, the focal length f =5.02mm of the optical lens 100, the f-number FNO =1.95 of the optical lens 100, the maximum field angle FOV =96.68deg of the optical lens 100, and the total length TTL =7.63mm of the optical lens 100 are taken as examples.

Other parameters in the fourth embodiment are given in table 7 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 7 are all mm, and the refractive index, the abbe number, and the focal length in table 7 are all obtained at the reference wavelength 587 nm.

K in table 8 is a conic constant, and table 8 shows high-order coefficient coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the fourth embodiment.

TABLE 7

TABLE 8

Referring to fig. 8, as can be seen from the longitudinal spherical aberration diagram (a) in fig. 8, the astigmatism diagram (B) in fig. 8, and the distortion diagram (C) in fig. 8, the longitudinal spherical aberration, the astigmatism, and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 8 (a), fig. 8 (B), and fig. 8 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fifth embodiment

As shown in fig. 9, the optical lens 100 according to the fifth embodiment of the present application includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an ir filter 80, which are sequentially disposed from an object side to an image side along an optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.

Further, the first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with negative refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex, respectively, at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively 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 convex at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex at the paraxial region O; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave, respectively, at a paraxial region O.

Specifically, the focal length f =5.06mm of the optical lens 100, the f-number FNO =1.94 of the optical lens 100, the maximum field angle FOV =95.47deg of the optical lens 100, and the total length TTL =7.73mm of the optical lens 100 are taken as examples.

The other parameters in the fifth embodiment are given in table 9 below, and the definitions of the parameters can be obtained from the description of the previous embodiments, which are not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 9 are all mm, and the refractive index, the abbe number, and the focal length in table 9 are all obtained at the reference wavelength 587 nm.

K in table 10 is a conic constant, and table 10 gives high-order coefficient coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the fifth embodiment.

TABLE 9

TABLE 10

Referring to fig. 10, as can be seen from the longitudinal spherical aberration diagram (a) in fig. 10, the astigmatism diagram (B) in fig. 10 and the distortion diagram (C) in fig. 10, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 10 (a), fig. 10 (B), and fig. 10 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Referring to table 11, table 11 summarizes ratios of the relations in the first embodiment to the fifth embodiment of the present application.

TABLE 11

Referring to fig. 11, in a second aspect, the present application further discloses a camera module 200, which includes an image sensor 201 and the optical lens 100 as described in any one of the first to fifth embodiments of the first aspect, wherein the image sensor 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 to the image sensor 201, and the image sensor 201 is configured to convert the optical signal corresponding to the subject into an image signal, which is not described herein again. It can be understood that the camera module 200 having the optical lens 100 meets the design requirement of miniaturization while ensuring the imaging quality. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 12, in a third aspect, the present application further discloses an electronic device 300, where the electronic device 300 includes a housing 301 and the camera module 200 according to the second aspect, 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 car recorder, a car backing image, and the like. It can be understood that the electronic device 300 having the camera module 200 has all the technical effects of the optical lens. That is, the design requirement for miniaturization is satisfied while ensuring the imaging quality. Since the technical effects are described in detail in the embodiments of the optical lens, the details are not repeated here.

Reference herein to first, second, third and various numerical designations is made only for convenience of description and is not intended to limit the scope of the present application.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply any order of execution, and the order of execution of the processes should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical lens system, comprising seven lens elements with refractive power along an optical axis from an object side to an image side, comprising:

the optical lens satisfies the following relation:

16mm ² <IMGH^2/FNO<18mm ² ；

wherein, IMGH is the radius of the maximum effective imaging circle of the optical lens, and FNO is the f-number of the optical lens.

2. An optical lens according to claim 1, wherein the optical lens satisfies the relation:

2.5<FNO*TTL/IMGH<2.8；

wherein, TTL is a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical lens.

3. An optical lens according to claim 1, wherein the optical lens satisfies the relation:

4.5mm<DL/(FNO*cos(HFOV))<5.0mm；

4. An optical lens according to claim 1, wherein the optical lens satisfies the relation:

1.2 sP 2/f <1.6; and/or-34 < (R11 + R12)/(R11-R12) < -10;

5. An optical lens according to claim 1, characterized in that the optical lens satisfies the relation:

-12<SD51/SAG51<-3；

the lens is characterized in that SD51 is the maximum effective semi-caliber of the object-side surface of the fifth lens, and SAG51 is the distance from the maximum effective caliber of the object-side surface of the fifth lens to the intersection point of the object-side surface of the fifth lens and the optical axis in the direction parallel to the optical axis.

6. An optical lens according to claim 1, wherein the optical lens satisfies the relation:

1.2<(CT34+CT45+CT56+CT67)/BFL<2.5；

wherein CT34 is a distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element on the optical axis, CT45 is a distance between the image-side surface of the fourth lens element and an object-side surface of the fifth lens element on the optical axis, CT56 is a distance between the image-side surface of the fifth lens element and an object-side surface of the sixth lens element on the optical axis, CT67 is a distance between the image-side surface of the sixth lens element and an object-side surface of the seventh lens element on the optical axis, and BFL is a minimum distance between the image-side surface of the seventh lens element and an image plane of the optical lens element in a direction parallel to the optical axis.

7. An optical lens according to claim 1, wherein the optical lens satisfies the relation:

-4.5<SAG72/ET7<-0.5；

SAG72 is a distance from a maximum effective aperture of an image side surface of the seventh lens element to an intersection point of the image side surface of the seventh lens element and the optical axis in a direction parallel to the optical axis, and ET7 is a distance from a maximum effective semi-aperture of an object side surface of the seventh lens element to the maximum effective semi-aperture of the image side surface of the seventh lens element in the direction parallel to the optical axis.

8. An optical lens according to claim 1, wherein the optical lens satisfies the relation:

6.5< | f1/f7| <48.5; and/or, 1 woven fabric R71/R72<3;

9. The utility model provides a module of making a video recording which characterized in that: the camera module comprises an optical lens according to any one of claims 1-8 and an image sensor, the image sensor being disposed on an image side of the optical lens.

10. An electronic device, characterized in that: the electronic device comprises a housing and the camera module of claim 9, the camera module being disposed on the housing.