CN115390226B

CN115390226B - Optical lens, camera module and electronic equipment

Info

Publication number: CN115390226B
Application number: CN202211324126.5A
Authority: CN
Inventors: 徐标; 李翔宇; 王国贵
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-03-24
Anticipated expiration: 2042-10-27
Also published as: CN115390226A

Abstract

The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens comprises: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the third lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the fourth lens element with positive refractive power has a convex image-side surface; the fifth lens element with negative refractive power has a concave object-side surface; the sixth lens element with refractive power and the seventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface, and the ninth lens element with negative refractive power has a concave image-side surface. The optical lens satisfies the following relation: 1.2 and then ttl/Imgh <1.35. The optical lens, the camera module and the electronic equipment provided by the invention can realize miniaturization and simultaneously give consideration to large image surface characteristics, so that the optical lens and an image sensor of the camera module have better matching property.

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

With the development of science and technology, the requirements of users on optical lenses are higher and higher, miniaturization and large image plane characteristics are pursued, so that the imaging device can be better matched with an image sensor of a camera module in electronic equipment, and good imaging quality is achieved. However, most of the optical lenses of the image capturing module are difficult to achieve the above miniaturization and large image plane feature.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can realize miniaturization and give consideration to large image surface characteristics so that the optical lens and an image sensor of the camera module have better matching property.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens assembly, which includes nine lens elements with refractive power, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element and a ninth lens element, which are disposed in order from an object side to an image side along an optical axis;

the first lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;

the second lens element with negative refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;

the third lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;

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

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

the sixth lens element with refractive power;

the seventh lens element with refractive power;

the eighth lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;

the ninth lens element with negative refractive power has a concave image-side surface at a paraxial region;

the optical lens satisfies the following relation:

1.2<TTL/Imgh< 1.35；

wherein TTL is a distance on the optical axis from an object-side surface of the first lens element to an image plane of the optical lens system, and Imgh is a half of an image height corresponding to a maximum field angle of the optical lens system.

In the optical lens provided by the application, in order to meet the requirement of good resolution on the basis of realizing miniaturization design, the refractive powers of the nine lenses are reasonably configured, that is, the first lens is set to have positive refractive power, the second lens has negative refractive power, and the combination of the two lenses, namely, the first lens and the second lens, is positive and negative, so that the on-axis spherical aberration of the optical lens can be favorably corrected; the third lens element and the fourth lens element with positive refractive power can help to correct astigmatism of the optical lens assembly, and the fifth lens element with negative refractive power, the sixth lens element with refractive power and the seventh lens element with refractive power can help to correct coma aberration of the optical lens assembly. The eighth lens element and the ninth lens element respectively have positive refractive power and negative refractive power, and the two lens elements are the two lens elements closest to the imaging surface of the optical lens, and a positive-negative fit can be beneficial to correcting the curvature of field of the optical lens. Meanwhile, the surface shapes of the nine lenses are designed, namely the object side surfaces and the image side surfaces of the first lens and the second lens are designed to be convex and concave surfaces at the positions close to the optical axis, so that the convergence of light rays can be facilitated, and more light rays can enter the optical lens; the object side surface and the image side surface of the third lens are respectively convex and concave at the paraxial region, so that the positive refractive power of the third lens can be enhanced, the surface shape of the third lens can be reasonably restrained, and the tolerance sensitivity and the stray light risk of the third lens can be reduced; and the first lens, the second lens and the third lens are convex-concave lenses, so that the whole length of the optical lens can be shortened. The fourth lens element has a convex image-side surface at a paraxial region and a concave object-side surface at a paraxial region, which is favorable for correcting spherical aberration, astigmatism, and curvature of field. The object side surface and the image side surface of the eighth lens element are respectively convex and concave at the paraxial region, which is beneficial for correcting the distortion of the optical lens, and the image side surface of the ninth lens element is concave at the paraxial region, which can reduce the overall sensitivity of the optical lens, thereby making the optical lens easy to manufacture.

Furthermore, among the first lens element to the ninth lens element, a plurality of lens elements are concave-convex or convex-concave lens elements, which can effectively control the thickness of each lens element on the optical axis, thereby facilitating the control of the total length of the optical lens, and enabling the optical lens to meet the design requirements of lightness, thinness and miniaturization.

In addition, when the optical lens satisfies the relation: when TTL/Imgh is less than 1.35 once (1.2), the total length of the optical lens can be effectively reduced, so that the miniaturization design requirement is realized, meanwhile, the optical lens can have the characteristic of a large image surface, further, more scene contents can be acquired, and the imaging information of the optical lens is enriched.

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

0.2< | R6+ R7|/| R6-R7| <1.2; and/or 1.3-sR3/R4 <1.4; and/or 0.2-woven fabric R81/R82<0.5;

wherein R6 is a curvature radius of an image-side surface of the third lens element at the optical axis, R7 is a curvature radius of an object-side surface of the fourth lens element at the optical axis, R3 is a curvature radius of an object-side surface of the second lens element at the optical axis, R4 is a curvature radius of the image-side surface of the second lens element at the optical axis, R81 is a curvature radius of an object-side surface of the eighth lens element at the optical axis, and R82 is a curvature radius of the image-side surface of the eighth lens element at the optical axis.

The curvature of the third lens and the curvature of the fourth lens can be effectively controlled by controlling the ratio of the curvature radius of the image side surface of the third lens at the optical axis to the curvature radius of the object side surface of the fourth lens at the optical axis, the third lens and the fourth lens are prevented from being too curved, the manufacturing sensitivity of the third lens and the fourth lens is reduced, meanwhile, the high-level coma aberration of the optical lens can be balanced, and the imaging quality of the optical lens is improved.

By controlling the ratio of the curvature radius of the object side surface of the second lens at the optical axis to the curvature radius of the image side surface of the second lens at the optical axis, the aberration generated by the optical lens can be effectively balanced, the sensitivity of the optical lens is reduced, and the processing and manufacturing of the second lens are facilitated.

By controlling the ratio of the curvature radii of the object-side surface and the image-side surface of the eighth lens element on the optical axis, on one hand, the astigmatism of the eighth lens element can be in a reasonable range, and the astigmatism generated by the front lens element (i.e., the lens element located in front of the eighth lens element) can be effectively balanced, so that the optical lens has good imaging quality. On the other hand, the overall surface shape of the eighth lens can be controlled so as not to be excessively bent, and the processing and manufacturing difficulty of the eighth lens is reduced.

0.2<|f9/(f4+f1)|<0.3；

where f9 is a focal length of the ninth lens, f4 is a focal length of the fourth lens, and f1 is a focal length of the first lens.

Therefore, the focal power of the first lens, the fourth lens and the ninth lens can be reasonably distributed, the spherical aberration of the optical lens can be reduced, and the on-axis area of the optical lens has good imaging quality.

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

0.98<SD11/SD52<1.01；

wherein SD11 is the maximum effective half aperture of the object-side surface of the first lens, and SD52 is the maximum effective half aperture of the image-side surface of the fifth lens.

The ratio of the maximum effective half aperture of the object side surface of the first lens to the maximum effective half aperture of the image side surface of the fifth lens is controlled, so that the whole optical lens has a smaller volume, the miniaturization requirement is realized, meanwhile, the angle maximization of incident light can be guaranteed through the large aperture design of the first lens, and the aperture of the fifth lens is smaller, so that the incident light can be favorably folded and converged.

2.7< (SD 72-SD 81)/(SD 82-SD 91) < 4.3; and/or, 0.9-straw SD72/SD81 <0.95; that is, the optical lens satisfies the relation: 2.7< (SD 72-SD 81)/(SD 82-SD 91) < 4.3, or the relation 0.9-straw sd72/SD81 <0.95 is satisfied, or the relation is satisfied at the same time: 2.7< (SD 72-SD 81)/(SD 82-SD 91) < 4.3 and 0.9 were woven SD72/SD81 <0.95.

Wherein SD72 is the maximum effective half aperture of the image-side surface of the seventh lens element, SD81 is the maximum effective half aperture of the object-side surface of the eighth lens element, SD82 is the maximum effective half aperture of the image-side surface of the eighth lens element, and SD91 is the maximum effective half aperture of the object-side surface of the ninth lens element.

By controlling the difference between the maximum effective semi-aperture of the object side surface of the eighth lens and the maximum effective semi-aperture of the image side surface of the seventh lens and the difference between the maximum effective semi-aperture of the object side surface of the ninth lens and the maximum effective semi-aperture of the image side surface of the eighth lens to be within a certain range, light rays of the optical lens in the rear lens group (namely the seventh lens, the eighth lens and the ninth lens) can be smoother, deflection of the light rays among the lenses is reduced, convergence of edge aberration is facilitated, and meanwhile the sensitivity of an edge field is reduced.

The ratio of the maximum effective half aperture of the image side surface of the seventh lens to the maximum effective half aperture of the object side surface of the eighth lens is controlled, namely, the section difference between the seventh lens and the eighth lens is small, so that the transition of light between the seventh lens and the eighth lens is more gradual, and the light can enter the ninth lens more gradually through the eighth lens.

0.43<CT3/CT7<0.65；

wherein CT3 is the thickness of the third lens element on the optical axis (i.e., the central thickness of the third lens element), and CT7 is the thickness of the seventh lens element on the optical axis (i.e., the central thickness of the seventh lens element).

By controlling the ratio of the central thicknesses of the third lens and the seventh lens, on one hand, the field curvature of the optical lens can be adjusted through the third lens and the seventh lens, and on the other hand, the central thicknesses of the third lens and the seventh lens can be controlled, so that the central thicknesses of the third lens and the seventh lens can be controlled within a certain thickness range, the third lens and the seventh lens can be machined and formed, and the machining and manufacturing difficulty of the third lens and the seventh lens can be reduced.

0.05<AT67/TD < 0.07；

AT67 is a distance between an image-side surface of the sixth lens element and an object-side surface of the seventh lens element on the optical axis, and TD is a distance between an object-side surface of the first lens element and an image-side surface of the ninth lens element on the optical axis.

When the optical lens meets the relation that 0.05 Ap (Ap), AT67/TD and 0.07 are satisfied, the space ratio of the distance from the object side surface of the first lens to the image side surface of the ninth lens on the optical axis of the rear lens group (the seventh, eighth and ninth lenses) can be effectively controlled, so that the light diffusion of the optical lens is more gentle, the maximum incident angle of the chief ray is reduced, the relative illumination is improved, and the optical lens can have good imaging quality.

0-woven fabric f/f3<0.3; and/or-0.5-woven fabric f/f5<0; and/or, 1.0 are woven fabric f8/f <1.4;

where f is a focal length of the optical lens, f3 is a focal length of the third lens, f5 is a focal length of the fifth lens, and f8 is a focal length of the eighth lens.

The focal length ratio of the optical lens to the focal length of the third lens is controlled within a certain range, so that the focal power of the third lens can be controlled within a reasonable range, astigmatism can be better corrected, and the optical lens has good imaging quality.

By controlling the focal length ratio of the optical lens to the focal length ratio of the fifth lens within a certain range, the focal power of the fifth lens can be in a reasonable range, astigmatism can be corrected better, and the optical lens has good imaging quality.

And the focal length of the eighth lens and the focal length ratio of the optical lens are controlled, so that the focal power of the eighth lens is in a reasonable range, high-grade spherical aberration can be corrected, and the optical lens has good imaging quality.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.5-straw SAG91/CT 9< 2.1; and/or, 1-woven SAG81/CT 8< 2;

wherein SAG91 is a distance in the optical axis direction from a maximum effective aperture of an object-side surface of the ninth lens to an intersection point of the object-side surface of the ninth lens and the optical axis (i.e., a sagittal height of the object-side surface of the ninth lens), CT9 is a thickness in the optical axis direction of the ninth lens (i.e., a central thickness of the ninth lens), SAG81 is a distance in the optical axis direction from a maximum effective aperture of an object-side surface of the eighth lens to an intersection point of the object-side surface of the eighth lens and the optical axis (i.e., a sagittal height of the object-side surface of the eighth lens), and CT8 is a thickness in the optical axis direction of the eighth lens (i.e., a central thickness of the eighth lens).

The ratio of the rise of the object side surface of the ninth lens to the center thickness of the ninth lens is controlled, the shape and the center thickness of the ninth lens can be effectively restrained, the overall thickness of the ninth lens is uniform, the overall structure of the ninth lens is properly bent, the processing difficulty of the ninth lens is favorably reduced, off-axis aberration is favorably eliminated, and the imaging quality of the marginal field of view is improved.

The ratio of the rise of the object side surface of the eighth lens to the center thickness of the eighth lens is controlled, the shape and the center thickness of the eighth lens can be effectively restrained, the overall thickness of the eighth lens is uniform, the overall structure is properly bent, the processing difficulty of the eighth lens is favorably reduced, off-axis aberration is favorably eliminated, and the imaging quality of the edge view field is improved.

In addition, the satisfaction of the relation can also enable the overall structure of the eighth lens and the ninth lens to be approximately adapted, so that the space utilization rate is favorably improved, the miniaturization design is favorably realized, and a synergistic effect can be realized on the improvement of the imaging quality of the edge field of view.

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 can realize miniaturization, simultaneously has good resolution and good imaging quality.

In a third aspect, the 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 can realize miniaturization, simultaneously gives consideration to good resolution ratio and has good imaging quality.

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

Furthermore, among the first lens element to the ninth lens element, a plurality of lens elements are concave-convex or convex-concave lens elements, which can effectively control the thickness of each lens element on the optical axis, and thus is beneficial to controlling the total length of the optical lens, so that the optical lens can meet the design requirements of lightness, thinness and miniaturization.

When the optical lens satisfies the relation: when TTL/Imgh is less than 1.35 once (1.2), the total length of the optical lens can be effectively reduced, so that the miniaturization design requirement is realized, meanwhile, the optical lens can have the characteristic of a large image surface, further, more scene contents can be acquired, and the imaging information of the optical lens is enriched.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application, and it is obvious for those skilled in the art to obtain other 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 the 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 an optical lens disclosed in a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 13 is a schematic structural diagram of the camera module disclosed in the present application;

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

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solution of the present application 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 disclosure, an optical lens 100 is disclosed, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, which are disposed in order from an object side to an image side along an optical axis. The first lens element L1 with positive refractive power, the second lens element L2 with negative 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 or negative refractive power, the seventh lens element L7 with negative refractive power or positive refractive power, the eighth lens element L8 with positive refractive power, and the ninth lens element with negative refractive power. During imaging, light rays sequentially enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 from the object side of the first lens L1, and finally form an image on the imaging surface 101 of the optical lens 100.

Further, the object-side surface 11 of the first lens element L1 is convex at a paraxial region, and the image-side surface 12 of the first lens element L1 is concave at a paraxial region; the object-side surface 21 of the second lens element L2 is convex at a paraxial region, and the image-side surface 22 of the second lens element L2 is concave at a paraxial region; the object-side surface 31 of the third lens element L3 is convex at the paraxial region, and the image-side surface 32 of the third lens element L3 is concave at the paraxial region; the object-side surface 41 of the fourth lens element L4 is convex or concave at the paraxial region, and the image-side surface 42 of the fourth lens element L4 is convex at the paraxial region; the object-side surface 51 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface 52 of the fifth lens element L5 is convex at the paraxial region; the object-side surface 61 of the sixth lens element L6 is concave or convex at a paraxial region, and the image-side surface 62 of the sixth lens element L6 is convex or concave at a paraxial region; the object-side surface 71 of the seventh lens element is convex or concave at a paraxial region thereof, and the image-side surface 72 of the seventh lens element is concave or convex at a paraxial region thereof; the object-side surface 81 of the eighth lens element L8 is convex at the paraxial region, and the image-side surface 82 of the eighth lens element L8 is concave at the paraxial region; the object-side surface 91 of the ninth lens element L9 is concave or convex at a paraxial region, and the image-side surface 92 of the ninth lens element L9 is concave at a paraxial region.

In some embodiments, the optical lens 100 may be applied to electronic devices such as smart phones and smart tablets, and therefore, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 may be made of plastic, so as to achieve the light and thin property of the optical lens 100 and facilitate the processing of the lens with complex surface. It is understood that, in other embodiments, when the optical lens 100 is applied to an electronic device such as an in-vehicle device, a driving recorder, or an automobile, or is applied to an automobile and used as a camera on an automobile body, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 may all be glass lenses, so that the optical lens 100 has a good optical effect and the temperature sensitivity may be reduced.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop and/or a field stop, which may be disposed between the object side of the optical lens 100 and the object side 11 of the first lens L1. It is understood that, in other embodiments, the aperture 102 may also be disposed between the first lens L1 and the second lens L2, or between the second lens L2 and the third lens L3, and the setting may be adjusted according to actual situations, and the embodiment is not limited in particular.

In some embodiments, the optical lens 100 further includes a filter 103, and the filter 103 is disposed between the ninth lens element L9 and the image plane 101 of the optical lens 100. Optionally, the optical filter 103 may be an infrared filter, and the infrared filter is selected for use, so that infrared light can be filtered, the imaging quality is improved, and the imaging better conforms to the visual experience of human eyes. It is understood that the optical filter 103 may be made of an optical glass coating film, a colored glass, or other materials, and may be selected according to actual needs, and is not limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.05 Once straw AT67/TD < 0.07; here, AT67 is a distance between the image-side surface 62 of the sixth lens element L6 and the object-side surface 71 of the seventh lens element L7 on the optical axis, and TD is a distance between the object-side surface 11 of the first lens element L1 and the image-side surface 92 of the ninth lens element L9 on the optical axis.

When the optical lens 100 satisfies the relation of 0.05 Ap AT67/TD < 0.07, the spatial ratio of the distances on the optical axis of the rear lens groups (the seventh, eighth, and ninth lenses) from the object-side surface 11 of the first lens L1 to the image-side surface 92 of the ninth lens L9 can be effectively controlled, so that the light diffusion of the optical lens 100 is more gradual, the maximum chief ray incident angle is reduced, the relative illuminance is improved, and the optical lens 100 can have good imaging quality.

In some embodiments, optical lens 100 satisfies the following relationship 0.2< | R6+ R7|/| R6-R7| <1.2; wherein R6 is a curvature radius of the image-side surface 32 of the third lens element L3 at the optical axis, and R7 is a curvature radius of the object-side surface 41 of the fourth lens element L4 at the optical axis. The curvature radius of the image side surface 32 of the third lens L3 at the optical axis and the curvature radius of the object side surface 41 of the fourth lens L4 at the optical axis are controlled to be a ratio, the curvatures of the third lens L3 and the fourth lens L4 can be effectively controlled, the third lens L3 and the fourth lens L4 are prevented from being too curved, the manufacturing sensitivity of the third lens L3 and the fourth lens L4 is reduced, meanwhile, the high-level coma aberration of the optical lens 100 can be balanced, and the imaging quality of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.3-sR3/R4 <1.4; wherein R3 is a curvature radius of the object-side surface 21 of the second lens element L2 at the optical axis, and R4 is a curvature radius of the image-side surface 22 of the second lens element L2 at the optical axis. By controlling the ratio of the curvature radius of the object-side surface 21 of the second lens element L2 at the optical axis to the curvature radius of the image-side surface 22 of the second lens element L2 at the optical axis, the aberration generated by the optical lens 100 can be effectively balanced, the sensitivity of the optical lens 100 can be reduced, and the second lens element L2 can be easily manufactured. When the lower limit of the relation is lower, the sensitivity of the optical lens 100 is increased, which is not favorable for manufacturing the second lens L2. If the upper limit of the relational expression is exceeded, it is difficult to correct curvature of field and aberration of the optical lens 100, resulting in poor overall imaging performance of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< -R81/R82 <0.5; wherein R81 is a curvature radius of the object-side surface 81 of the eighth lens element L8 at the optical axis, and R82 is a curvature radius of the image-side surface 82 of the eighth lens element L8 at the optical axis. By controlling the ratio of the curvature radii of the object-side surface and the image-side surface of the eighth lens element L8 at the optical axis, on one hand, the astigmatism of the eighth lens element L8 can be in a reasonable range, and the astigmatism generated by the front lens element (i.e., the lens element located in front of the eighth lens element) can be effectively balanced, so that the optical lens system 100 has good imaging quality. On the other hand, the overall surface shape of the eighth lens L8 can be controlled so as not to be excessively curved, thereby reducing the difficulty in processing and manufacturing the eighth lens L8.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< | f 9/(f 4+ f 1) | <0.3; where f9 is a focal length of the ninth lens L9, f4 is a focal length of the fourth lens L4, and f1 is a focal length of the first lens L1. In this way, the focal powers of the first lens L1, the fourth lens L4 and the ninth lens L9 can be reasonably distributed, which is beneficial to reducing the spherical aberration of the optical lens 100, so that the on-axis area of the optical lens 100 has good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.98-woven fabric SD11/SD52<1.01; wherein SD11 is the maximum effective half-aperture of the object-side surface 11 of the first lens L1, and SD52 is the maximum effective half-aperture of the image-side surface 52 of the fifth lens L5. By controlling the ratio of the maximum effective half aperture of the object side surface 11 of the first lens L1 to the maximum effective half aperture of the image side surface 52 of the fifth lens L5, the whole optical lens 100 can have a smaller volume, and the miniaturization requirement is realized, meanwhile, the large aperture design of the first lens L1 can ensure the angle maximization of incident light, and the aperture of the fifth lens L5 is smaller, which is beneficial to gathering and converging the incident light.

In some embodiments, the optical lens 100 satisfies the following relationship: 2.7< (SD 72-SD 81)/(SD 82-SD 91) < 4.3, where SD72 is the maximum effective half aperture of the image-side surface of the seventh lens L7, SD81 is the maximum effective half aperture of the object-side surface of the eighth lens L8, SD82 is the maximum effective half aperture of the image-side surface of the eighth lens L8, and SD91 is the maximum effective half aperture of the object-side surface 91 of the ninth lens L9. By controlling the difference between the maximum effective half aperture of the object-side surface of the eighth lens L8 and the maximum effective half aperture of the image-side surface of the seventh lens L7 and the difference between the maximum effective half aperture of the object-side surface 91 of the ninth lens L9 and the maximum effective half aperture of the image-side surface of the eighth lens L8 within a certain range, the light of the optical lens 100 in the rear lens group (i.e., the seventh, eighth, and ninth lenses) can be made smoother, the deflection of the light between the lenses can be reduced, the convergence of the peripheral aberration can be facilitated, and the sensitivity of the peripheral field can be reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.9-straw SD72/SD81 <0.95. By controlling the ratio of the maximum effective half aperture of the image-side surface of the seventh lens L7 to the maximum effective half aperture of the object-side surface of the eighth lens L8, that is, the step difference between the seventh lens L7 and the eighth lens L8 is small, the transition of the light between the seventh lens L7 and the eighth lens L8 can be more gradual, and the light can enter the ninth lens L9 through the eighth lens L8 more gradually.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.43-straw CT3/CT7<0.65;

wherein CT3 is the thickness of the third lens element L3 on the optical axis (i.e., the central thickness of the third lens element L3), and CT7 is the thickness of the seventh lens element L7 on the optical axis (i.e., the central thickness of the seventh lens element L7).

By controlling the ratio of the central thicknesses of the third lens L3 and the seventh lens L7, on one hand, the field curvature of the optical lens 100 can be adjusted by the third lens L3 and the seventh lens L7, and on the other hand, the central thicknesses of the third lens L3 and the seventh lens L7 can be controlled, so that the central thicknesses of the third lens L3 and the seventh lens L7 can be controlled within a certain thickness range, the third lens L3 and the seventh lens L7 can be processed and molded, and the processing and manufacturing difficulty of the third lens L3 and the seventh lens L7 can be reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: TTL/Imgh is more than 1.2 and less than 1.35; for example, TTL/Imgh can be 1.21, 1.23, 1.25, 1.27, 1.29, 1.31, 1.33, 1.34, and the like. Wherein TTL is a distance on the optical axis from the object-side surface of the first lens element L1 to the image plane 101 of the optical lens system 100 (i.e., a total length of the optical lens system 100), and Imgh is a half of an image height corresponding to a maximum field angle of the optical lens system 100.

Therefore, the total length of the optical lens 100 can be effectively reduced, so that the design requirement of miniaturization is realized, and meanwhile, the optical lens 100 can have the characteristic of a large image plane, so that more scene contents can be acquired, and the imaging information of the optical lens 100 is enriched.

In some embodiments, the optical lens 100 satisfies the following relationship: 0-woven fabric f/f3<0.3; where f is a focal length of the optical lens 100, and f3 is a focal length of the third lens L3. By controlling the focal length ratio of the optical lens 100 to the focal length ratio of the third lens L3 within a certain range, the focal power of the third lens L3 can be controlled within a reasonable range, so that astigmatism can be better corrected, and the optical lens 100 has good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: -0.5 and f/f5<0, f5 being the focal length of the fifth lens L5. By controlling the focal length ratio of the optical lens 100 to the focal length ratio of the fifth lens L5 within a certain range, the focal power of the fifth lens L5 can be within a reasonable range, so that astigmatism can be corrected better, and the optical lens 100 has good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0 sP 8/f <1.4; f8 is the focal length of the eighth lens L8. By controlling the ratio of the focal length of the eighth lens L8 to the focal length of the optical lens 100, the focal power of the eighth lens L8 can be in a reasonable range, so that the high-level spherical aberration can be corrected, and the optical lens 100 has good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.5< -SAGD 91/CT 9< 2.1, <SAGD91 is the distance in the optical axis direction (i.e. the sagittal height of the object-side surface 91 of the ninth lens L9) from the maximum effective aperture of the object-side surface 91 of the ninth lens L9 to the intersection of the object-side surface 91 of the ninth lens L9 with the optical axis, and CT9 is the thickness of the ninth lens L9 in the optical axis (i.e. the center thickness of the ninth lens L9).

Through the ratio of the rise of the object side surface 91 of the ninth lens L9 to the center thickness of the ninth lens L9, the shape and the center thickness of the ninth lens L9 can be effectively constrained, so that the overall thickness of the ninth lens L9 is uniform, the overall structure is properly bent, the processing difficulty of the ninth lens L9 is favorably reduced, off-axis aberration is favorably eliminated, and the imaging quality of the marginal field of view is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 1 instead, SAG81/CT 8< 2, where SAG81 is the distance in the optical axis direction from the maximum effective aperture of the object-side surface of the eighth lens L8 to the intersection of the object-side surface of the eighth lens L8 and the optical axis (i.e., the rise of the object-side surface of the eighth lens L8), and CT8 is the thickness of the eighth lens L8 in the optical axis (i.e., the center thickness of the eighth lens L8). Through the ratio of the rise of the object side surface of the eighth lens L8 to the center thickness of the eighth lens L8, the shape and the center thickness of the eighth lens L8 can be effectively constrained, so that the overall thickness of the eighth lens L8 is uniform, the overall structure is properly bent, the processing sensitivity of the eighth lens L8 is favorably reduced, off-axis aberration is favorably eliminated, and the imaging quality of an edge field is improved.

In addition, the rise and the center thickness of the ninth lens and the eighth lens are limited, the overall structures of the eighth lens L8 and the ninth lens L9 can be approximately adapted, the space utilization rate is improved, the miniaturization design is facilitated, and a synergistic effect can be achieved on the improvement of the imaging quality of the edge field.

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

First embodiment

A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative 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, the seventh lens element L7 with negative refractive power, the eighth lens element L8 with positive refractive power, and the ninth lens element L9 with negative refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the paraxial region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at paraxial regions; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively convex and concave at the paraxial region; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are respectively concave and convex at paraxial regions; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at a paraxial region; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex on the optical axis; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are both concave at the optical axis; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are respectively convex and concave at the optical axis, and the object-side surface 91 and the image-side surface 92 of the ninth lens element L9 are respectively convex and concave at the paraxial region.

Specifically, taking the focal length f =7.64mm of the optical lens 100, the f-number FNO =1.68 of the optical lens 100, the maximum field angle FOV =86.6deg of the optical lens 100, and the total length TTL =9.43mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given by table 1 below. The elements of the optical lens 100 from the object side to the image side 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 radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis. The first value in the "thickness" parameter set of a lens is the thickness of the lens on the optical axis, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis), the direction from the object side surface of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis, when the value is negative, it indicates that the stop 102 is disposed on the image side of the vertex of the next surface, and if the thickness of the stop 102 is positive, the stop 102 is disposed on the object side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the refractive index, abbe number, etc. in Table 1 were obtained at a reference wavelength of 587nm, and the focal length was obtained at a reference wavelength of 555 nm.

In addition,

surface numbers

1 and 2 in the following tables 1 and 2 correspond to the object-side surface 11 and the image-side surface 12 of the first lens L1, surface numbers 3 and 4 correspond to the object-side surface 21 and the image-side surface 22 of the second lens L2, and so on, and surface numbers 17 and 18 correspond to the object-side surface 91 and the image-side surface 92 of the ninth lens L9, respectively.

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

；

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the curvature at the optical axis of the aspheric surface, c =1/Y (i.e., paraxial curvature c is the inverse of radius of curvature Y in table 1 below); k is the cone coefficient; ai is a correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 which can be used for the surface numbers 1 to 18 in the first embodiment, while the surface numbers 15 to 18 also give the high-order term coefficients a22, a24, a26, a28, a30.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at 435nm, 470nm, 510nm, 555nm, 610nm, and 650 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, 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 illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 555 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, Y represents the curvature of the imaging plane 101 in the meridional direction, and X 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 distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 555 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 a wavelength of 555 nm.

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 stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis.

Further, in the refractive power design of the first lens element L1 to the ninth lens element L9, different from the first embodiment, the seventh lens element L7 in the second embodiment has positive refractive power.

Further, of the surface shapes of the first lens element L1 to the ninth lens element L9 with the object-side surface and the image-side surface at the paraxial region, only the object-side surface and the image-side surface of the seventh lens element are convex in this embodiment, and the surface shapes of the remaining lens elements with the object-side surface and the image-side surface at the paraxial region are the same as those in the first embodiment.

Specifically, the parameters of the optical lens 100 are given in table 3 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are 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 like in table 3 are all obtained at the reference wavelength 587nm, and the focal length is obtained at the reference wavelength 555 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the second embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the ninth lens element L9 are aspheric surfaces, and the method for calculating the surface shape x of each aspheric lens can be obtained by using the description of the foregoing embodiments, which is not repeated herein. Table 4 below gives the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the second embodiment, and the high-order term coefficients a22, a24, a26, a28, and a30 are also given in the surface numbers 15 to 18.

TABLE 3

TABLE 4

Referring to fig. 4, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of 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 stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a filter 103, which are sequentially disposed from an object side to an image side along an optical axis.

Further, in the refractive power designs of the first lens element L1 to the ninth lens element L9, different from the first embodiment, the sixth lens element L6 in the third embodiment has negative refractive power.

Further, of the surface shapes of the object-side surface and the image-side surface of the first lens element L1 to the ninth lens element L9 at the paraxial region, only the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively concave and convex, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively convex and concave in this embodiment, and the surface shapes of the object-side surface and the image-side surface of the remaining lens elements at the paraxial region are the same as those of the first embodiment.

Specifically, the parameters of the optical lens 100 are given by table 5 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and 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 like in table 5 are all obtained at the reference wavelength 587nm, and the focal length is obtained at the reference wavelength 555 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the third embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the ninth lens element L9 are aspheric surfaces, and the method for calculating the surface shape x of each aspheric lens can be obtained by using the description of the foregoing embodiments, which is not repeated herein. Table 6 below gives the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the third embodiment, and the high-order term coefficients a22, a24, a26, a28, and a30 are also given in the surface numbers 15 to 18.

TABLE 5

TABLE 6

Referring to fig. 6, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of 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 stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis.

Further, in the present embodiment, the refractive powers of the first lens element L1 to the ninth lens element L9 are the same as those of the first embodiment.

In the present embodiment, only the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave at the paraxial region, the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex and concave at the paraxial region, respectively, and the shapes of the object-side surface and the image-side surface of the remaining lens elements at the paraxial region are the same as those of the first embodiment.

Specifically, the parameters of the optical lens 100 are given by table 7 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and 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 like in table 7 are obtained at the reference wavelength 587nm, and the focal length is obtained at the reference wavelength 555 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the fourth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the ninth lens element L9 are aspheric surfaces, and the method for calculating the surface shape x of each aspheric lens can be obtained by using the description of the foregoing embodiments, which is not repeated herein. Table 8 below gives the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fourth embodiment, and the surface numbers 15 to 18 also give the high-order term coefficients a22, a24, a26, a28, and a30.

TABLE 7

TABLE 8

Referring to fig. 8, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 8, 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. 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

A schematic structural diagram of an optical lens 100 disclosed in the fifth embodiment of the present application is shown in fig. 9, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis.

In the present embodiment, only the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region, the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave and convex at the paraxial region, respectively, the object-side surface 91 and the image-side surface 92 of the ninth lens element L9 are concave at the paraxial region, and the shapes of the object-side surface and the image-side surface of the remaining lens elements at the paraxial region are the same as those of the first embodiment.

Specifically, the parameters of the optical lens 100 are given by table 9 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and 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 like in table 9 are all obtained at the reference wavelength 587nm, and the focal length is obtained at the reference wavelength 555 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the fifth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the ninth lens element L9 are aspheric surfaces, and the method for calculating the surface shape x of each aspheric lens can be obtained by using the description of the foregoing embodiments, which is not repeated herein. The high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fifth embodiment are given in table 10 below, and the high-order term coefficients a22, a24, a26, a28, and a30 are also given in the surface numbers 15 to 18.

TABLE 9

TABLE 10

Referring to fig. 10, as can be seen from the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 10, 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. 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.

Sixth embodiment

A schematic structural diagram of an optical lens 100 disclosed in a sixth embodiment of the present application is shown in fig. 11, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis.

Further, in the present embodiment, only the object-side surface 91 and the image-side surface 92 of the ninth lens element L9 are concave at the paraxial region, and the shapes of the object-side surface and the image-side surface of the remaining lens elements at the paraxial region are the same as those of the first embodiment.

Specifically, the parameters of the optical lens 100 are given by table 11 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 11 are all mm, and the refractive index, the abbe number, and the like in table 11 are all obtained at the reference wavelength 587nm, and the focal length is obtained at the reference wavelength 555 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the sixth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the ninth lens element L9 are aspheric surfaces, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the description of the foregoing embodiments, which is not repeated herein. Table 12 below gives the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the sixth embodiment, and the high-order term coefficients a22, a24, a26, a28, and a30 are also given in the surface numbers 15 to 18.

TABLE 11

TABLE 12

Referring to fig. 12, as can be seen from the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 12, 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. 12 (a), fig. 12 (B), and fig. 12 (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 13, table 13 summarizes the ratios of the relations in the first embodiment to the sixth embodiment of the present application.

Watch 13

Referring to fig. 13, the present application further discloses a camera module 200, wherein the camera module 200 includes an image sensor 201 and the optical lens 100 as described in any of the first to sixth embodiments of the first aspect, and the image sensor 201 is disposed at 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 image capturing module 200 having the optical lens 100 has all the technical effects of the optical lens 100, i.e., the function of achieving both miniaturization and good resolution. 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. 14, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a housing 301 and the camera module 200, and the camera module 200 is disposed on 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, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the electronic apparatus 300 can be miniaturized while satisfying the function of good resolution. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An optical lens system includes nine lens elements with refractive power, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element and a ninth lens element disposed in order from an object side to an image side along an optical axis;

the sixth lens element with refractive power;

the seventh lens element with refractive power;

the optical lens satisfies the relation 1.2-straw TTL/Imgh <1.35, and any one of the following relations:

0.98<SD11/SD52<1.01、2.7<(SD72-SD81)/(SD82-SD91) < 4.3、0.9<SD72/SD81 <0.95；

wherein TTL is a distance on the optical axis from an object-side surface of the first lens element to an image plane of the optical lens element, imgh is a half of an image height corresponding to a maximum field angle of the optical lens element, SD11 is a maximum effective half aperture of the object-side surface of the first lens element, and SD52 is a maximum effective half aperture of the image-side surface of the fifth lens element; SD72 is the maximum effective half aperture of the image-side surface of the seventh lens element, SD81 is the maximum effective half aperture of the object-side surface of the eighth lens element, SD82 is the maximum effective half aperture of the image-side surface of the eighth lens element, and SD91 is the maximum effective half aperture of the object-side surface of the ninth lens element.

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

0.2< | R6+ R7|/| R6-R7| <1.2; and/or, 1.3-woven fabric R3/R4<1.4; and/or 0.2-woven fabric R81/R82<0.5;

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

0.43<CT3/CT7<0.65；

wherein CT3 is the thickness of the third lens element on the optical axis, and CT7 is the thickness of the seventh lens element on the optical axis.

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

0.05<AT67/TD < 0.07；

wherein AT67 is a distance between an image-side surface of the sixth lens element and an object-side surface of the seventh lens element on the optical axis, and TD is a distance between the object-side surface of the first lens element and the image-side surface of the ninth lens element on the optical axis.

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

0-woven fabric f/f3<0.3; and/or-0.5-woven fabric f/f5<0; and/or, 1.0 are woven fabric f8/f <1.4; and/or, 0.2< | f 9/(f 4+ f 1) | <0.3;

where f is a focal length of the optical lens, f3 is a focal length of the third lens, f5 is a focal length of the fifth lens, f8 is a focal length of the eighth lens, f9 is a focal length of the ninth lens, f4 is a focal length of the fourth lens, and f1 is a focal length of the first lens.

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

1.5-straw SAG91/CT 9< 2.1; and/or, 1-woven SAG81/CT 8< 2;

SAG91 is a distance in an optical axis direction from a maximum effective aperture of an object-side surface of the ninth lens to an intersection point of the object-side surface of the ninth lens and the optical axis, CT9 is a thickness of the ninth lens in the optical axis direction, SAG81 is a distance in the optical axis direction from a maximum effective aperture of an object-side surface of the eighth lens to an intersection point of the object-side surface of the eighth lens and the optical axis, and CT8 is a thickness of the eighth lens in the optical axis direction.

7. A camera module, characterized in that it comprises an optical lens according to any one of claims 1 to 6 and an image sensor, said image sensor being arranged on the image side of said optical lens.

8. An electronic device comprising a housing and the camera module of claim 7, wherein the camera module is disposed on the housing.