CN113484984B

CN113484984B - Optical lens, camera module and electronic equipment

Info

Publication number: CN113484984B
Application number: CN202110688600.1A
Authority: CN
Inventors: 杨健; 华露; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2023-09-05
Anticipated expiration: 2041-06-21
Also published as: CN113484984A

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises a first lens with positive refractive power, an object side surface and an image side surface of the first lens are convex surfaces and concave surfaces, and the first lens is sequentially arranged from the object side to the image side along an optical axis; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; a third lens element with refractive power having a convex image-side surface; a fourth lens element with refractive power; the object side surface and the image side surface of the fifth lens element with refractive power are concave and convex; a sixth lens element with refractive power; a seventh lens element with positive refractive power having a convex image-side surface; an eighth lens element with refractive power having a convex object-side surface and a concave image-side surface; the object side surface and the image side surface of the ninth lens element with negative refractive power are concave, and the optical lens element meets the following relationship: 2< r91/f9<3. The optical lens, the camera module and the electronic equipment provided by the embodiment of the invention can realize high-quality imaging effect while realizing miniaturized design.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the miniaturization development of various electronic devices (such as mobile phones and tablet computers), the miniaturization requirement for an optical lens provided in an electronic device is increasing, and in order to adapt to an image sensor with a continuously reduced size, the optical lens is required to be miniaturized and achieve a high-quality imaging effect. Under the current state of the art, how to adapt to miniaturization of an optical lens to match with the trend of miniaturization of electronic equipment, and at the same time, enabling the optical lens to reduce distortion so as to have good imaging quality is a problem to be solved.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, which can realize miniaturization of the optical lens and reduce distortion so that the optical lens has good imaging quality.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens, 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 and a concave image-side surface at a paraxial region; the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the third lens element with refractive power has a convex image-side surface at a paraxial region; the fourth lens element with refractive power; the fifth lens element with refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the sixth lens element with refractive power; the seventh lens element with positive refractive power has a convex image-side surface at a paraxial region; the eighth lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the ninth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the optical lens satisfies the following relation: 2< r91/f9<3; where r91 is a radius of curvature of the object side surface of the ninth lens element at the optical axis, and f9 is a focal length of the ninth lens element.

In the optical lens provided in the present embodiment of the disclosure, the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface, so that light incident into the optical lens element is converged. When light passes through the second lens element with negative refractive power, the object-side surface of the second lens element is convex at the optical axis, and the image-side surface of the second lens element is concave at the optical axis, so that the aberration of the light passing through the first lens element is improved. The arrangement that the image side of the third lens is convex is favorable for dispersing incident light, so that the incident light can smoothly transition to the rear lens. The object side surface of the fifth lens is a concave surface at the optical axis, and the image side surface of the fifth lens is a convex surface, so that the total length of the optical lens is reduced, and the miniaturization of the optical lens is realized. The seventh lens element with positive refractive power has a convex image-side surface at an optical axis, which is advantageous for reasonably arranging an air gap between the front and rear lens elements to reduce ghost image risk and reduce difficulty in molding and assembling the lens elements. The object side surface of the eighth lens element is convex at the optical axis, the image side surface of the eighth lens element is concave at the optical axis, and the eighth lens element can be configured with positive or negative refractive power to correct the aberration generated by the front lens element (the first lens element to the seventh lens element), thereby improving the aberration balance of the optical lens element and the resolution of the optical lens element and improving the imaging quality of the optical lens element. When light rays are incident into the ninth lens element with negative refractive power, an object-side surface of the ninth lens element is concave at the optical axis, and an image-side surface of the ninth lens element is concave at the optical axis, such that the marginal field of view light rays are incident into an imaging surface of the optical lens element, and the imaging surface of the optical lens element has high relative brightness, thereby improving the imaging quality of the optical lens element. Therefore, the refractive power and the surface shape of each lens are reasonably configured, so that the optical lens achieves a high-quality imaging effect while achieving a miniaturized design requirement. In addition, by controlling the ratio of the radius of curvature of the object side surface of the ninth lens element to the focal length of the ninth lens element, the refractive power of the ninth lens element can be controlled, and when the above relation is satisfied, the ninth lens element can contribute to a reasonable negative refractive power so as to adjust the incident angle of the light rays entering the imaging surface of the optical lens element, so that the optical lens element can be better adapted to the image sensor, and the optical lens element can be better adapted to correct the astigmatism of the optical lens element, reduce the distortion, and be beneficial to improving the imaging quality of the optical lens element.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2< |f56|/(10 (ct5+ct6)) <14; wherein f56 is a combined focal length of the fifth lens element and the sixth lens element, ct5 is a distance between an object-side surface and an image-side surface of the fifth lens element on an optical axis, i.e., a middle thickness of the fifth lens element, and ct6 is a distance between an object-side surface and an image-side surface of the sixth lens element on an optical axis, i.e., a middle thickness of the sixth lens element. When the above relation is satisfied, the combined refractive power of the fifth lens element and the sixth lens element can be controlled within a reasonable range, so as to better adapt to the refractive power required by the optical lens element. Meanwhile, the restraint of the relational expression is beneficial to controlling the thickness of the fifth lens and the sixth lens, so that the optical lens can better correct distortion and chromatic aberration, further improve the resolution of the optical lens and realize high-quality imaging of the optical lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.5 < etmax/etmin <2.1; wherein etmax is the maximum edge thickness value of the first to ninth lenses, and etmin is the minimum edge thickness value of the first to ninth lenses. Since the thickness of each lens has a great influence on the total length of the optical lens, in order to enable a miniaturized design of the optical lens, the total length of the optical lens is reduced by controlling the ratio of the maximum side thickness value of the nine lenses of the optical lens to the minimum side thickness value of the nine lenses of the optical lens. Meanwhile, when the relation is satisfied, the distortion and the aberration of the optical lens are reduced, and the imaging quality of the optical lens can be improved. In addition, by controlling the edge thickness of the nine lenses, it is possible to avoid the difficulty in assembling the optical lens due to the excessive difference in edge thickness of the nine lenses.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -1.1< (f 0.1)/sag 81< -0.8; wherein f is an effective focal length of the optical lens, and sag81 is a distance from an intersection point of the object side surface of the eighth lens and the optical axis to a maximum effective radius of the object side surface of the eighth lens in the optical axis direction, that is, a sagittal height of the object side surface of the eighth lens. Because the refractive power of the eighth lens element may be positive refractive power or negative refractive power, the object-side surface of the eighth lens element may not be excessively curved or flattened due to the constraint of the above-mentioned relationship, so that the eighth lens element may provide a proper positive refractive power or negative refractive power when being matched with the overall refractive power required by the optical lens element, thereby correcting aberrations generated by the lenses (i.e., the first lens element to the seventh lens element) before the eighth lens element and improving the imaging quality of the optical lens element. Meanwhile, when the relation is satisfied, the total length of the optical lens can be shortened, and further the miniaturization design of the optical lens is realized.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.2< |f789|/f7<7.2; wherein f789 is a combined focal length of the seventh lens, the eighth lens, and the ninth lens, and f7 is a focal length of the seventh lens. When the above relation is satisfied, the refractive powers of the seventh lens element, the eighth lens element and the ninth lens element may be spatially and reasonably distributed, so as to correct the aberration generated by the front lens element (i.e., the lens elements formed by the first lens element and the sixth lens element) to balance the aberration of the optical lens element, thereby ensuring that the optical lens element has good imaging quality.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: imgH/FNO is more than or equal to 3.7mm; 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. So that the optical lens satisfies the relation: when ImgH/FNO is more than or equal to 3.7mm, the characteristic of a large image plane can be obtained under the condition that the optical lens has enough luminous flux, so that the optical lens can be adapted to an image sensor with higher pixels, and the imaging quality of the optical lens is improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: f/TTL >0.82; wherein f is an effective focal length of the optical lens, and TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on an optical axis. The ratio of the effective focal length of the optical lens to the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is controlled within a reasonable range, so that the total length of the optical lens can be shortened, and the miniaturized design of the optical lens is realized. Meanwhile, when the relation is satisfied, the large aperture effect of the optical lens is facilitated, so that the optical lens can obtain enough luminous flux in a dim environment, the imaging quality of the optical lens is further ensured, and the shooting experience of a user is facilitated to be improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: imgH/sdmin > 4; wherein ImgH is the radius of the maximum effective imaging circle of the optical lens, sdmin is the maximum effective radius value of the lens with the minimum effective caliber from the first lens to the ninth lens. In order to achieve the miniaturization design of the optical lens, when the optical lens meets the above relation, the front end volume of the optical lens can be reduced, so as to achieve the effect of front end miniaturization of the optical lens. Meanwhile, the ratio of the radius of the maximum effective imaging circle of the optical lens to the maximum effective radius value of the lens with the minimum effective caliber in the first lens to the ninth lens is controlled within the range required by the relational expression, so that the characteristic of a large image plane is realized, and further, the optical lens realizes high-quality imaging.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -2.1< (f2+f1)/f12 < -1.7; wherein f2 is the focal length of the second lens, f1 is the focal length of the first lens, and f12 is the combined focal length of the first lens and the second lens. Since the shape and the bending degree of each lens are affected by the refractive power required to be satisfied by each lens, when the optical lens satisfies the above relation, the refractive powers of the first lens and the second lens of the optical lens can be reasonably configured, so that the shapes and the surface bending degrees of the first lens and the second lens can be well controlled, and the size of the optical lens can be controlled within a required range, thereby realizing the miniaturization design of the optical lens. Meanwhile, the reasonable configuration of the refractive power of the first lens and the second lens is beneficial to balancing the tolerance sensitivity of each lens, so that the processing difficulty of the first lens and the second lens is reduced.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes an image sensor and the optical lens according to the first aspect, and the image sensor is disposed on an image side of the optical lens. The camera module with the optical lens of the first aspect not only can realize the overall miniaturization design, but also can realize high-quality imaging of the camera module.

In a third aspect, the present invention discloses an electronic device, which includes a housing and an image capturing module set according to the second aspect, where the image capturing module set is disposed in the housing. The electronic equipment with the camera module can realize high-quality imaging effect while meeting miniaturization, so that a user can obtain better shooting experience.

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

according to the optical lens, the image pickup module and the electronic equipment provided by the embodiment of the invention, nine lenses with positive refractive power are adopted in the optical lens, the first lens with positive refractive power is adopted, the object side surface of the first lens is convex at the optical axis, and the image side surface of the first lens is concave at the optical axis, so that light rays entering the optical lens are converged. When light passes through the second lens element with negative refractive power, the object-side surface of the second lens element is convex at the optical axis, and the image-side surface of the second lens element is concave at the optical axis, so that the aberration of the light passing through the first lens element is improved. The arrangement of the convex image side surface of the third lens is beneficial to dispersing incident light, so that the incident light can smoothly transition to the rear lens. The object side surface of the fifth lens is concave at the optical axis, and the image side surface of the fifth lens is convex, so that the total length of the optical lens is reduced, and the miniaturization of the optical lens is realized. The seventh lens element with positive refractive power has a convex image-side surface at an optical axis, which is beneficial to reasonably arranging an air gap between the front lens element and the rear lens element, thereby reducing ghost image risk and reducing difficulty in molding and assembling the lens elements. The object side surface of the eighth lens element is convex at the optical axis, and the image side surface of the eighth lens element is concave at the optical axis, and the eighth lens element can be configured with positive or negative refractive power to correct the aberration generated by the front lens element (the first lens element) to the seventh lens element, so as to promote the aberration balance of the optical lens element and further improve the resolution of the optical lens element, thereby improving the imaging quality of the optical lens element. When light rays are incident into the ninth lens element with negative refractive power, an object-side surface of the ninth lens element is concave at the optical axis, and an image-side surface of the ninth lens element is concave at the optical axis, such that light rays with a marginal field of view are incident into an imaging surface of the optical lens element, and the imaging surface of the optical lens element has high relative brightness, thereby improving the imaging quality of the optical lens element. By reasonably configuring the refractive power and the surface shape of each lens, the optical lens achieves the design requirement of miniaturization and high-quality imaging effect. Further, the optical lens is made to satisfy the relation: 2< r91/f9<3, by controlling the ratio of the radius of curvature of the object side surface of the ninth lens element to the focal length of the ninth lens element, the refractive power of the ninth lens element can be controlled, and when the above relation is satisfied, the ninth lens element can contribute to a reasonable negative refractive power so as to adjust the incident angle of the light rays entering the imaging surface of the optical lens element, so that the optical lens element can be better adapted to the image sensor, and the optical lens element can be better corrected for astigmatism, distortion can be reduced, and the imaging quality of the optical lens element can be improved.

Drawings

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

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

fig. 2 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens according to a first embodiment of the present application;

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

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

FIG. 5 is a schematic view of an optical lens according to a third embodiment of the present application;

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

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

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

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

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

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

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

fig. 13 is a schematic structural view of an optical lens disclosed in a seventh embodiment of the present application;

fig. 14 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in a seventh embodiment of the present application;

FIG. 15 is a schematic view of a camera module according to the present disclosure;

fig. 16 is a schematic structural view of an electronic device disclosed in the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

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

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

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

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

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, 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 O. In 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, the seventh lens L7, the eighth lens L8 and the ninth lens L9 in order from the object side of the first lens L1 and finally forms an image on the imaging surface 101 of the optical lens 100. 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 or negative refractive power, the fourth lens element L4 with positive or negative refractive power, the fifth lens element L5 with positive or negative refractive power, the sixth lens element L6 with positive or negative refractive power, the seventh lens element L7 with positive refractive power, the eighth lens element L8 with positive or negative refractive power, and the ninth lens element L9 with negative refractive power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex at a 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 convex or concave at a 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 convex or concave at a paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex or concave at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is concave at a paraxial region O, and the image-side surface 52 of the fifth lens element L5 is convex at the paraxial region O; the object-side surface 61 of the sixth lens element L6 is convex or concave at the optical axis O, and the image-side surface 62 of the sixth lens element L6 is convex or concave at the optical axis O; the object-side surface 71 of the seventh lens element L7 is convex or concave at the optical axis O, and the image-side surface 72 of the seventh lens element L7 is convex at the optical axis O; the object-side surface 81 of the eighth lens element L8 is convex at the optical axis O, and the image-side surface 82 of the eighth lens element L8 is concave at the optical axis O; the object-side surface 91 of the ninth lens element L9 is concave at the optical axis O, and the image-side surface 92 of the ninth lens element L9 is concave at the optical axis O.

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 glass lenses, so that the optical lens 100 has a good optical effect and can reduce the temperature sensitivity.

Alternatively, the 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, the seventh lens L7, the eighth lens L8 and the ninth lens L9 may be plastic, so that the optical lens 100 is light and thin and easy to process the complex surfaces of the lenses.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop 102 and/or a field stop 102, which may be disposed between the object side of the optical lens 100 and the object side 11 of the first lens L1. It will be appreciated that in other embodiments, the diaphragm 102 may be disposed between other lenses, for example, between the image side 12 of the first lens element L1 and the object side 21 of the second lens element L2, and the arrangement may be specifically adjusted according to practical situations, and the embodiment is not limited thereto.

In some embodiments, the optical lens 100 further includes a filter 10, and the filter 10 is disposed between the ninth lens L9 and the imaging surface 101 of the optical lens 100. By selecting the infrared filter 10, infrared light can be filtered, imaging quality is improved, and imaging is more in line with the visual experience of human eyes. It is to be understood that the optical filter 10 may be made of an optical glass coating or may be made of a colored glass, and may be specifically selected according to practical needs, and the embodiment is not limited specifically.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< r91/f9<3; where r91 is a radius of curvature of the object side surface 91 of the ninth lens element L9 at the optical axis O, and f9 is a focal length of the ninth lens element L9. By controlling the ratio of the radius of curvature of the object side surface 91 of the ninth lens element L9 at the optical axis O to the focal length of the ninth lens element L9, the refractive power of the ninth lens element L9 can be controlled, and when the above-mentioned relationship is satisfied, the ninth lens element L9 can contribute a reasonable negative refractive power to adjust the incident angle of the light beam incident on the imaging surface 101 of the optical lens element 100, so that the optical lens element 100 can be better adapted to the image sensor to achieve high-quality imaging of the optical lens element 100. Meanwhile, when the optical lens 100 satisfies the above relation, the optical lens 100 is conducive to correcting astigmatism and reducing distortion, and imaging quality of the optical lens 100 is further improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< |f56|/(10 (ct5+ct6)) <14; where f56 is the combined focal length of the fifth lens element L5 and the sixth lens element L6, ct5 is the distance between the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 on the optical axis O, which is the middle thickness of the fifth lens element L5, and ct6 is the distance between the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 on the optical axis O, which is the middle thickness of the sixth lens element L6. When the above-described relation is satisfied, the combined refractive power of the fifth lens element L5 and the sixth lens element L6 can be controlled within a reasonable range to better adapt the magnitude of refractive power required by the optical lens element 100. Meanwhile, the constraint of the above relation is helpful to control the thicknesses of the fifth lens L5 and the sixth lens L6, so that the optical lens 100 can better correct distortion and chromatic aberration, thereby improving the resolution of the optical lens 100 and realizing high-quality imaging of the optical lens 100. When |f56|/(10× (ct5+ct6)) ∈14), the combined negative refractive power provided by the fifth lens element L5 and the sixth lens element L6 is insufficient, so that the aberration correcting capability of the optical lens element 100 is reduced, resulting in a reduction in the imaging quality of the optical lens element 100; when |f56|/(10× (ct5+ct6)) +.2, the combined negative refractive power provided by the fifth lens element L5 and the sixth lens element L6 is too large, the aberration balance of the optical lens 100 is easily broken, so that the imaging quality of the optical lens 100 is degraded.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.5 < etmax/etmin <2.1; wherein etmax is the maximum edge thickness value of the first lens L1 to the ninth lens L9, and etmin is the minimum edge thickness value of the first lens L1 to the ninth lens L9. Since the thickness of each lens in the optical lens 100 greatly affects the total length of the optical lens 100, in order to enable a miniaturized design of the optical lens 100, the total length of the optical lens 100 is reduced by controlling the ratio of the maximum side thickness value in the first lens L1 to the ninth lens L9 to the minimum side thickness value in the first lens L1 to the ninth lens L9. When the above relation is satisfied, the distortion and aberration of the optical lens 100 can be reduced, and the imaging quality of the optical lens 100 can be improved. In addition, by controlling the edge thickness of the nine lenses, it is possible to avoid a situation in which the optical lens 100 is difficult to assemble due to an excessive difference in edge thickness of the nine lenses. When etmax/etmin is more than or equal to 2.1, the difference between the maximum edge thickness value and the minimum edge thickness value is too large, so that uniformity of edge thickness of the nine lenses is not ensured, further, the overall sensitivity of the optical lens 100 is increased, the stability is reduced, and the imaging quality of the optical lens 100 is difficult to ensure.

In some embodiments, the optical lens 100 satisfies the following relationship: -1.1< (f 0.1)/sag 81< -0.8; wherein f is the effective focal length of the optical lens 100, and the distance from the intersection point of the object side surface 81 of the eighth lens element L8 of the sag81 to the optical axis O to the maximum effective radius of the object side surface 81 of the eighth lens element L8 in the direction of the optical axis O is the sagittal height of the object side surface 81 of the eighth lens element L8. Because the refractive power of the eighth lens element L8 can be positive or negative, the object-side surface 81 of the eighth lens element L8 can not be excessively curved or flattened due to the constraint of the above-mentioned relationship, so that the eighth lens element L8 can provide a proper positive or negative refractive power when the overall refractive power of the optical lens element 100 is matched with the required overall refractive power, thereby correcting the aberration generated by each lens element (i.e., the first lens element L1 to the seventh lens element L7) before the eighth lens element L8 and improving the imaging quality of the optical lens element 100. Meanwhile, when the above relation is satisfied, the total length of the optical lens 100 can be shortened, thereby realizing a miniaturized design of the optical lens 100. When f is 0.1/sag81 is greater than or equal to-0.8, the eighth lens element L8 has insufficient positive refractive power or negative refractive power, resulting in insufficient aberration correction capability of the optical lens element 100, and thus cannot guarantee the imaging quality of the optical lens element 100; when f is less than or equal to 0.1/sag81 is less than or equal to-1.1, the sagittal height of the object side surface 81 of the eighth lens element L8 is excessively large, so that the surface shape of the eighth lens element L8 is excessively complex, and the difficulty in molding and processing the lens element is increased.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2< |f789|/f7<7.2; wherein f789 is a combined focal length of the seventh lens L7, the eighth lens L8, and the ninth lens L9, and f7 is a focal length of the seventh lens L7. When the above relation is satisfied, the refractive powers of the seventh lens element L7, the eighth lens element L8 and the ninth lens element L9 can be reasonably spatially distributed, so as to correct the aberration generated by the front lens element group (i.e., the lens element group formed by the first lens element L1 to the sixth lens element L6), thereby realizing the aberration balance of the optical lens element 100 and ensuring that the optical lens element 100 obtains good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: imgH/FNO is more than or equal to 3.7mm; where ImgH is the radius of the maximum effective imaging circle of the optical lens 100 and FNO is the f-number of the optical lens 100. By determining the above relation, the characteristic of a large image plane can be obtained under the condition that the optical lens 100 has enough luminous flux, so that the optical lens 100 can be adapted to an image sensor with higher pixels, and further the imaging quality of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: f/TTL >0.82; where f is the effective focal length of the optical lens 100, and TTL is the distance from the object side surface 11 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis O. The ratio of the effective focal length of the optical lens 100 to the distance from the object side surface 11 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis O is controlled within a reasonable range, so that the total length of the optical lens 100 can be shortened, and the miniaturized design of the optical lens 100 can be realized. Meanwhile, when the above relation is satisfied, the large aperture effect of the optical lens 100 is facilitated, so that the optical lens 100 can obtain enough luminous flux in a dim environment, further, the imaging quality of the optical lens 100 is ensured, and the shooting experience of a user is facilitated to be improved.

In some embodiments, the optical lens 100 satisfies the following relationship: imgH/sdmin > 4; wherein ImgH is the radius of the maximum effective imaging circle of the optical lens 100, sdmin is the maximum effective radius value of the lens with the smallest effective aperture of the first lens L1 to the ninth lens L9. In order to achieve a miniaturized design of the optical lens 100, when the optical lens 100 satisfies the above-described relation, the front-end volume of the optical lens 100 may be reduced to achieve the effect of front-end miniaturization of the optical lens 100. Meanwhile, controlling the ratio of the radius of the maximum effective imaging circle of the optical lens 100 to the maximum effective radius value of the lens with the minimum effective caliber in the first lens L1 to the ninth lens L9 is beneficial to realizing the characteristic of a large image plane within the range required by the relational expression, so that the optical lens 100 realizes high-quality imaging. When ImgH/sdmin is less than or equal to 4, the maximum effective radius value of the lens with the smallest effective caliber in the first lens L1 to the ninth lens L9 of the optical lens 100 is too large, which is unfavorable for the optical lens 100 to obtain the characteristic of large image plane, and simultaneously hinders the requirement of shortening the total length of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: -2.1< (f2+f1)/f12 < -1.7; wherein f2 is the focal length of the second lens L2, f1 is the focal length of the first lens L1, and f12 is the combined focal length of the first lens L1 and the second lens L2. Since the shape and the bending degree of each lens in the optical lens 100 are affected by the refractive power required to be satisfied by each lens, when the optical lens 100 satisfies the above relation, the refractive powers of the first lens L1 and the second lens L2 of the optical lens 100 can be reasonably configured, so that the shape and the surface bending degree of the first lens L1 and the second lens L2 can be well controlled, and the size of the optical lens 100 can be controlled within the required range, so as to realize the miniaturization design of the optical lens 100. Meanwhile, by reasonably configuring the refractive powers of the first lens element L1 and the second lens element L2, the tolerance sensitivity of each lens element can be balanced, so as to reduce the processing difficulty of the first lens element L1 and the second lens element L2.

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

First embodiment

As shown in fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application, the optical lens 100 includes a diaphragm 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 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f=7.49 mm of the optical lens 100, the aperture value fno=1.95 of the optical lens 100, the field angle fov=88.75° of the optical lens 100, and the total length ttl=8.90 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 2 and 3 correspond to the object side surface and the image side surface of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis O. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The value of the diaphragm 102 in the "thickness" parameter row is the distance between the diaphragm 102 and the vertex of the subsequent surface (the vertex refers to the intersection point of the surface and the optical axis O) on the optical axis O, and 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 O by default, when the value is negative, it indicates that the diaphragm 102 is disposed on the right side of the vertex of the subsequent surface, and when the thickness of the diaphragm 102 is positive, the diaphragm 102 is on the left side of the vertex of the subsequent surface. It is understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index and Abbe number in Table 1 were obtained at a reference wavelength of 587.6nm, and the focal length was obtained at a reference wavelength of 555 nm.

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 L9 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis O direction; c is the curvature of the aspherical surface at the optical axis O, c=1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the first embodiment are given in Table 2 below.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows the optical spherical aberration diagrams of the optical lens 100 of the first embodiment at wavelengths of 470nm, 510nm, 555nm, 610nm and 650 nm. In fig. 2 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the optical lens 100 in the first embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 555nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatism curves represent the meridional imaging plane 101 curvature T and the sagittal imaging plane 101 curvature S, and it can be seen from fig. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2 (C), fig. 2 (C) is a graph showing a distortion curve of the optical lens 100 at a wavelength of 555nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 2 (C), the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

Second embodiment

As shown in fig. 3, a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application, the optical lens 100 includes a diaphragm 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 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f=7.46 mm of the optical lens 100, the aperture value fno=2 of the optical lens 100, the field angle fov= 88.80 of the optical lens 100, and the total length ttl=8.90 mm of the optical lens 100 as examples, other parameters of the optical lens 100 are given in table 3 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 3 are all mm, and the refractive index and abbe number in table 3 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

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, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated here. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the second embodiment are given in Table 4 below.

TABLE 3 Table 3

TABLE 4 Table 4

/>

Referring to fig. 4, as can be seen from the graph of (a) optical spherical aberration in fig. 4, the graph of (B) optical spherical aberration in fig. 4, and the graph of (C) distortion in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and the description thereof will not be repeated here.

Third embodiment

As shown in fig. 5, a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application, 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 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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 positive refractive power, the eighth lens element L8 with negative refractive power, and the ninth lens element L9 with negative refractive power.

Specifically, taking the effective focal length f=7.48 mm of the optical lens 100, the aperture value fno=1.95 of the optical lens 100, the field angle fov=88.65° of the optical lens 100, and the total length ttl=8.90 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 5 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 5 are all mm, and the refractive index and abbe number in table 5 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

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, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated here. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the third embodiment are given in Table 6 below.

TABLE 5

TABLE 6

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

Fourth embodiment

As shown in fig. 7, a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application, 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 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f=7.48 mm of the optical lens 100, the aperture value fno= 1.941 of the optical lens 100, the field angle fov=88.66° of the optical lens 100, and the total length ttl=8.90 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 7 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 7 are all mm, and the refractive index and abbe number in table 7 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

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, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated herein. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the fourth embodiment are given in Table 8 below.

TABLE 7

TABLE 8

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

Fifth embodiment

As shown in fig. 9, a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application, the optical lens 100 includes a 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 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f=7.54 mm of the optical lens 100, the aperture value fno=1.95 of the optical lens 100, the field angle fov=87.17° of the optical lens 100, and the total length ttl=8.99 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 9 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 9 are all mm, and the refractive index and abbe number in table 9 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

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, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated herein. The following table 10 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 that can be used for each aspherical mirror in the fifth embodiment.

TABLE 9

Table 10

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

Sixth embodiment

As shown in fig. 11, a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present application, the optical lens 100 includes a 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 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f=7.46 mm of the optical lens 100, the aperture value fno=1.88 of the optical lens 100, the field angle fov= 88.84 of the optical lens 100, and the total length ttl=9.00 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 11 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 11 are all mm, and the refractive index and abbe number in table 11 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

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, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, and will not be repeated here. The following table 12 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 that can be used for each aspherical mirror in the sixth embodiment.

TABLE 11

Table 12

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

Seventh embodiment

As shown in fig. 13, a schematic structural diagram of an optical lens 100 according to a seventh embodiment of the present application, 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 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f=7.46 mm of the optical lens 100, the aperture value fno=1.79 of the optical lens 100, the field angle fov= 88.82 ° of the optical lens 100, and the total length ttl=9.05 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 13 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 13 are all mm, and the refractive index and abbe number in table 13 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the seventh 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, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated herein. The following table 14 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 that can be used for each aspherical mirror in the seventh embodiment.

TABLE 13

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TABLE 14

Referring to fig. 14, as can be seen from the graph of (a) optical spherical aberration in fig. 14, the graph of (B) optical spherical aberration in fig. 14, and the graph of (C) distortion in fig. 14, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 14 (a), 14 (B), and 14 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B), and 2 (C), and the description thereof will be omitted here.

Referring to table 15, table 15 is a summary of the ratios of the relationships in the first embodiment to the seventh embodiment of the present application.

TABLE 15

Relation/embodiment	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment	Sixth embodiment	Seventh embodiment
								2<r91/f9<3	2.37	2.47	2.51	2.54	2.41	2.86	2.455
2<\|f56\|/(10*(ct5+ct6))<14	13.21	2.36	5.38	7.72	12.00	11.35	8.414
								1.5＜etmax/etmin<2.1	1.793	1.770	1.780	1.814	2.027	1.808	1.817
-1.1<(f*0.1)/sag81<-0.8	-1.02	-1.06	-0.94	-0.93	-0.87	-0.98	-0.963
								1.2<\|f789\|/f7<7.2	1.46	7.07	1.75	2.00	1.50	2.11	2.754
ImgH/FNO≥3.7mm	3.795mm	3.700mm	3.795mm	3.812mm	3.759mm	3.934mm	4.146mm
								f/TTL>0.82	0.842	0.839	0.840	0.841	0.838	0.828	0.824
ImgH/sdmin＞4	4.52	4.55	4.49	4.44	4.42	4.37	4.171
								-2.1<(f2+f1)/f12<-1.7	-2.04	-1.79	-1.84	-1.83	-1.88	-1.81	-1.900

Referring to fig. 15, the present application further discloses an image capturing module 200, where the image capturing module 200 includes an image sensor 201 and the optical lens 100 according to any one of the first to seventh embodiments, the image sensor 201 is disposed on an image side of the optical lens, and the image sensor 201 is configured to convert an optical signal corresponding to a subject into an image signal, which is not described herein. It can be appreciated that the image capturing module 200 having the optical lens 100 described above can not only realize the miniaturization design of the whole thereof, but also realize the high-quality imaging of the image capturing module 200.

Referring to fig. 16, the application further discloses an electronic device 300, where the electronic device 300 includes a housing and the camera module 200 as described above, and the camera module 200 is disposed in the housing. The electronic equipment 300 with the camera module 200 can realize high-quality imaging effect while meeting miniaturization, so that a user can obtain better shooting experience.

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

Claims

1. An optical lens comprising a total of nine lenses having refractive power, the optical lens comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens 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 and a concave image-side surface at a paraxial region;

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

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

the fourth lens element with refractive power;

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

the sixth lens element with refractive power;

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

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

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

the optical lens satisfies the following relation:

2<r91/f9<3；

where r91 is a radius of curvature of the object side surface of the ninth lens element at the optical axis, and f9 is a focal length of the ninth lens element.

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

2<|f56|/(10*(ct5+ct6))<14；

wherein f56 is a combined focal length of the fifth lens and the sixth lens, ct5 is a thickness of the fifth lens on the optical axis, and ct6 is a thickness of the sixth lens on the optical axis.

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

1.5<etmax/etmin<2.1；

wherein etmax is the maximum edge thickness value of the first to ninth lenses, and etmin is the minimum edge thickness value of the first to ninth lenses.

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

-1.1<(f*0.1)/sag81<-0.8；

where f is an effective focal length of the optical lens, and sag81 is a distance from an intersection point of the object side surface of the eighth lens and the optical axis to a maximum effective radius of the object side surface of the eighth lens in the optical axis direction.

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

1.2<|f789|/f7<7.2；

wherein f789 is a combined focal length of the seventh lens, the eighth lens, and the ninth lens, and f7 is a focal length of the seventh lens.

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

ImgH/FNO≥3.7mm；

f/TTL>0.82；

wherein ImgH is the radius of the maximum effective imaging circle of the optical lens, FNO is the f-number of the optical lens, f is the effective focal length of the optical lens, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis.

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

ImgH/sdmin＞4；

wherein ImgH is the radius of the maximum effective imaging circle of the optical lens, sdmin is the maximum effective radius value of the lens with the minimum effective caliber from the first lens to the ninth lens.

8. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

-2.1<(f2+f1)/f12<-1.7；

wherein f2 is the focal length of the second lens, f1 is the focal length of the first lens, and f12 is the combined focal length of the first lens and the second lens.

9. An imaging module comprising an image sensor and the optical lens according to any one of claims 1 to 8, wherein the image sensor is disposed on an image side of the optical lens.

10. An electronic device, comprising a housing and the camera module of claim 9, wherein the camera module is disposed on the housing.