CN113484984A

CN113484984A - Optical lens, camera module and electronic equipment

Info

Publication number: CN113484984A
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: 2021-10-08
Anticipated expiration: 2041-06-21
Also published as: CN113484984B

Abstract

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

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the miniaturization of various electronic devices (e.g., mobile phones, tablet computers, etc.), there is an increasing demand for miniaturization of optical lenses installed in the electronic devices, and in order to adapt to image sensors with decreasing sizes, there is a demand for optical lenses that can achieve high-quality imaging while maintaining miniaturization. In the current state of the art, how to adapt to the situation of miniaturization of an optical lens to match the trend of miniaturization of electronic devices, and simultaneously, enabling the optical lens to reduce distortion to have good imaging quality is a problem that needs to be solved.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera 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, a first aspect of the present invention discloses an optical lens including, in order from an object side to an image side along an optical axis, 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; 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 refractive power has a convex image-side surface at 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 thereof and a convex image-side surface at a paraxial region thereof; 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 thereof and a concave image-side surface at a paraxial region thereof; the ninth lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof; the optical lens satisfies the following relation: 2< r91/f9< 3; wherein r91 is a radius of curvature of an object-side surface of the ninth lens at an optical axis, and f9 is a focal length of the ninth lens.

In the optical lens system provided in this embodiment, the first lens element with positive refractive power is adopted, and the object-side surface of the first lens element is convex at the optical axis, and the image-side surface of the first lens element is concave at the optical axis, so that the light entering the optical lens system is converged. When light passes through the second lens element with negative refractive power, the aberration generated by the light passing through the first lens element is improved because 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. The image side surface of the third lens is convex, so that incident light can be dispersed, and the incident light can be smoothly transited 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 optical lens is miniaturized. The seventh lens element with positive refractive power has a convex image-side surface along the optical axis, which is favorable for reasonably setting the 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, and the image side surface of the eighth lens element is concave at the optical axis, and the positive and negative refractive power configurations of the eighth lens element are matched to correct the aberration generated by the front lens group (from the first lens element to the seventh lens element), so as to promote the aberration balance of the optical lens, and further improve the resolving power of the optical lens, thereby improving the imaging quality of the optical lens. When light rays are emitted to the ninth lens element with negative refractive power, the object side surface of the ninth lens element is concave at the optical axis, and the image side surface of the ninth lens element is concave at the optical axis, so that marginal field-of-view light rays are emitted to the imaging surface of the optical lens, and the imaging surface of the optical lens obtains high relative brightness, thereby improving the imaging quality of the optical lens. Accordingly, the optical lens system can achieve a high-quality imaging effect while meeting the design requirements for miniaturization by appropriately arranging the refractive power and the surface shape of each lens element. In addition, by controlling the ratio of the curvature radius 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 a reasonable negative refractive power to adjust the incident angle of the light beam incident on the imaging surface of the optical lens, so that the optical lens can better adapt to an image sensor, and simultaneously, the optical lens is favorable for correcting astigmatism of the optical lens and reducing distortion, and the imaging quality of the optical lens is favorably improved.

As an alternative implementation, 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 an axial distance between an object-side surface and an image-side surface of the fifth lens element, that is, a thickness of the fifth lens element, and ct6 is an axial distance between an object-side surface and an image-side surface of the sixth lens element, that is, a 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 system. Meanwhile, the constraint of the relational expression is beneficial to controlling the thicknesses of the fifth lens and the sixth lens, so that the optical lens can better correct distortion and chromatic aberration, the resolution power of the optical lens is further improved, and high-quality imaging of the optical lens is realized.

As an alternative implementation, 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 a maximum edge thickness value of the first to ninth lenses, and etmin is a minimum edge thickness value of the first to ninth lenses. Since the thickness of each lens greatly affects the total length of the optical lens, in order to realize the miniaturization design of the optical lens, the total length of the optical lens is reduced by controlling the ratio of the maximum edge thickness value of the nine lenses of the optical lens to the minimum edge thickness value of the nine lenses of the optical lens. Meanwhile, when the above relational expression is satisfied, the distortion and aberration of the optical lens can be reduced, and the imaging quality of the optical lens can be improved. In addition, by controlling the edge thicknesses of the nine lenses, the situation that the optical lens is difficult to assemble due to the overlarge difference of the edge thicknesses of the nine lenses can be avoided.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -1.1< (f 0.1)/sag81< -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 element and the optical axis to a maximum effective radius of the object-side surface of the eighth lens element in the optical axis direction, which is a rise of the object-side surface of the eighth lens element. Since the refractive power of the eighth lens element may be positive refractive power or negative refractive power, through the constraint of the above relational expression, the object-side surface of the eighth lens element is not excessively curved or flat, so that the eighth lens element can provide proper positive refractive power or negative refractive power under the condition of matching with the overall refractive power required by the optical lens system, so as to correct the aberration generated by the lenses before the eighth lens element (i.e., the first lens element to the seventh lens element), thereby improving the imaging quality of the optical lens system. Meanwhile, when the above relational expression 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, 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 relational expression is satisfied, the refractive powers of the seventh lens element, the eighth lens element and the ninth lens element may be reasonably spatially distributed, and then the aberration generated by the front lens group (i.e., the lens group consisting of the first lens element to the sixth lens element) is corrected, so as to achieve aberration balance of the optical lens, thereby ensuring that the optical lens obtains 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: ImgH/FNO is more than or equal to 3.7 mm; 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. Such that the optical lens satisfies the relation: when the ImgH/FNO is larger 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, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: f/TTL is greater than 0.82; wherein f is an effective focal length of the optical lens, and TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical lens. 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 miniaturization design of the optical lens is realized. Meanwhile, when the relational expression is satisfied, the large aperture effect of the optical lens is facilitated to be realized, so that the optical lens can obtain enough luminous flux in a dark environment, the imaging quality of the optical lens is further ensured, and the shooting experience of a user is favorably improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: ImgH/sdmin > 4; wherein ImgH is a radius of a maximum effective imaging circle of the optical lens, and sdmin is a maximum effective radius value of a lens with a smallest effective aperture among the first lens to the ninth lens. In order to realize the miniaturization design of the optical lens, when the optical lens meets the relational expression, the front end volume of the optical lens can be reduced, so that the effect of the front end miniaturization of the optical lens is realized. 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 smallest effective aperture from 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 facilitated to be realized, and the optical lens can realize high-quality imaging.

As an alternative implementation, 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 and second lenses. Because the shape and the bending degree of each lens element are influenced by the magnitude of the refractive power required by each lens element, when the optical lens system satisfies the above relational expression, the refractive powers of the first lens element and the second lens element of the optical lens system can be reasonably configured, so that the shapes and the surface bending degrees of the first lens element and the second lens element can be well controlled, and further the size of the optical lens system can be controlled within a required range, so as to realize the miniaturization design of the optical lens system. Meanwhile, by reasonably configuring the refractive power of the first lens element and the second lens element, the tolerance sensitivity of each lens element can be balanced, so that the processing difficulty of the first lens element and the second lens element can be reduced.

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 of the first aspect can realize the overall miniaturization design and high-quality imaging of the camera module.

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 meet the requirement of miniaturization, and can also realize a high-quality imaging effect, so that a user can obtain better shooting experience.

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

in the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the optical lens adopts nine lenses with refractive power, the first lens with positive refractive power is adopted, the object side surface of the first lens is a convex surface at the optical axis, and the arrangement that the image side surface of the first lens is a concave surface at the optical axis enables the light rays incident into the optical lens to be converged. When light passes through the second lens element with negative refractive power, the aberration generated by the light passing through the first lens element is improved because 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. The image side surface of the third lens is convex, so that incident light can be dispersed, and the incident light can be smoothly transited 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 optical lens is miniaturized. The seventh lens element with positive refractive power has a convex image-side surface along the optical axis, which is favorable for reasonably setting the 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, and the image-side surface of the eighth lens element is concave at the optical axis, and the positive and negative refractive power configurations of the eighth lens element are matched to correct the aberration generated by the front lens elements (the first lens element to the seventh lens element), so as to promote the aberration balance of the optical lens, and further improve the resolving power of the optical lens, thereby improving the imaging quality of the optical lens. When light rays are emitted to the ninth lens element with negative refractive power, the object side surface of the ninth lens element is concave at the optical axis, and the image side surface of the ninth lens element is concave at the optical axis so that marginal field-of-view light rays are emitted to the imaging surface of the optical lens element, so that the imaging surface of the optical lens element obtains high relative brightness, and the imaging quality of the optical lens element is improved. By reasonably configuring the refractive power and the surface shape of each lens, the optical lens meets the design requirement of miniaturization and realizes high-quality imaging effect. Further, the optical lens is made to satisfy the relation: 2< r91/f9<3, the refractive power of the ninth lens element can be controlled by controlling the ratio of the curvature radius of the object-side surface of the ninth lens element to the focal length of the ninth lens element, and when the above relation is satisfied, the ninth lens element can contribute reasonable negative refractive power to adjust the incident angle of light entering the imaging surface of the optical lens element, so that the optical lens element can better adapt to the image sensor, and simultaneously, the astigmatism of the optical lens element can be corrected, the 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 in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

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

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

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

fig. 14 is a ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 15 is a schematic structural diagram of the camera module disclosed in the present application;

fig. 16 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 invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.

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

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can 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 meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

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

Referring to fig. 1, according to a first aspect of the present application, 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. During imaging, light rays 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 in sequence from the object side of the first lens L1, and are finally imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power or negative refractive power, the fourth lens element L4 has positive refractive power or negative refractive power, the fifth lens element L5 has positive refractive power or negative refractive power, the sixth lens element L6 has positive refractive power or negative refractive power, the seventh lens element L7 has positive refractive power, the eighth lens element L8 has positive refractive power or negative refractive power, and the ninth lens element L9 has 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 the paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region O; the object-side surface 31 of the third lens element L3 is convex or concave at the paraxial region O, and the image-side surface 32 of the third lens element L3 is convex at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is convex or concave at the 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 the 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 along the optical axis O, and the image-side surface 62 of the sixth lens element L6 is convex or concave along the optical axis O; the object-side surface 71 of the seventh lens element L7 is convex or concave along the optical axis O, and the image-side surface 72 of the seventh lens element L7 is convex along the optical axis O; the object-side surface 81 of the eighth lens element L8 is convex along the optical axis O, and the image-side surface 82 of the eighth lens element L8 is concave along the optical axis O; the object-side surface 91 of the ninth lens element L9 is concave along the optical axis O, and the image-side surface 92 of the ninth lens element L9 is concave along 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 are all glass lenses, so that the optical lens 100 has a good optical effect and can reduce the temperature sensitivity of the optical lens 100.

Alternatively, 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 that the optical lens 100 is light and thin and can be easily processed into a lens complex shape.

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 is understood that, in other embodiments, the stop 102 may also be disposed between other lenses, for example, between the image-side surface 12 of the first lens L1 and the object-side surface 21 of the second lens L2, and the arrangement may be adjusted according to practical situations, and the present embodiment is not limited in particular.

In some embodiments, the optical lens 100 further includes an optical filter 10, and the optical filter 10 is disposed between the ninth lens element L9 and the image plane 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 visual experience of human eyes. It is understood that the optical filter 10 may be made of an optical glass coating film or a colored glass, and the specific choice may be made according to actual needs, and the embodiment is not particularly limited.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< r91/f9< 3; where r91 is the radius of curvature of the object-side surface 91 of the ninth lens L9 at the optical axis O, and f9 is the focal length of the ninth lens L9. By controlling the ratio of the curvature radius 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 relational expression is satisfied, the ninth lens element L9 can contribute a reasonable negative refractive power to adjust the incident angle of the light entering the image plane 101 of the optical lens 100, so that the optical lens 100 can better adapt to an image sensor, thereby achieving high-quality imaging of the optical lens 100. Meanwhile, when the optical lens 100 satisfies the above relational expression, it is helpful to correct astigmatism of the optical lens 100, reduce distortion, and further improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< | f56|/(10 × (ct5+ ct6)) < 14; wherein f56 is a combined focal length of the fifth lens element L5 and the sixth lens element L6, ct5 is a 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 a thickness of the fifth lens element L5, and ct6 is a 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 a thickness of the sixth lens element L6. When the above relationship 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 required refractive power of the optical lens system 100. Meanwhile, the constraint of the relational expression is helpful for controlling 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, the resolution of the optical lens 100 is improved, and high-quality imaging of the optical lens 100 is realized. 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 correction capability of the optical lens 100 is weakened, and the imaging quality of the optical lens 100 is reduced; 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, which easily breaks the aberration balance of the optical lens 100, 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; where etmax is a maximum edge thickness value of the first through ninth lenses L1-L9, and etmin is a minimum edge thickness value of the first through ninth lenses L1-L9. Since the thickness of each lens in the optical lens 100 has a great influence on the total length of the optical lens 100, in order to enable a compact design of the optical lens 100, the total length of the optical lens 100 is reduced by controlling the ratio of the maximum edge thickness value in the first lens L1 to the ninth lens L9 to the minimum edge thickness value in the first lens L1 to the ninth lens L9. When the above relational expression is satisfied, it is helpful to reduce distortion and aberration of the optical lens 100, and the imaging quality of the optical lens 100 can be improved. In addition, by controlling the edge thicknesses of the nine lenses, it is possible to avoid a situation in which the assembling of the optical lens 100 is difficult due to an excessive difference in the edge thicknesses of the nine lenses. When etmax/etmin is larger 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 the uniformity of the edge thicknesses of the nine lenses cannot be guaranteed, 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 guarantee.

In some embodiments, the optical lens 100 satisfies the following relationship: -1.1< (f 0.1)/sag81< -0.8; where f is the effective focal length of the optical lens 100, and a distance from an intersection point of the object-side surface 81 of the sag81 eighth lens L8 and the optical axis O to the maximum effective radius of the object-side surface 81 of the eighth lens L8 in the direction of the optical axis O is the rise of the object-side surface 81 of the eighth lens L8. Since the refractive power of the eighth lens element L8 may be positive refractive power or negative refractive power, due to the constraint of the above relational expression, the object-side surface 81 of the eighth lens element L8 is not too curved or flat, so that the eighth lens element L8 can provide proper positive refractive power or negative refractive power when the total refractive power required by the optical lens system 100 is matched, so as to correct the aberration generated by each lens element before the eighth lens element L8 (i.e., the first lens element L1 to the seventh lens element L7), thereby improving the imaging quality of the optical lens system 100. Meanwhile, when the above relational expression is satisfied, the total length of the optical lens 100 can be shortened, and further, the miniaturization design of the optical lens 100 can be realized. When f is 0.1/sag81 is not less than-0.8, the positive refractive power or the negative refractive power provided by the eighth lens element L8 is insufficient, which results in insufficient aberration correction capability for the optical lens 100 and further fails to ensure the imaging quality of the optical lens 100; when f is 0.1/sag81 ≦ 1.1, the rise of the object-side surface 81 of the eighth lens L8 is too large, so that the surface form of the eighth lens L8 is too complicated, resulting in an increase in difficulty in molding the lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2< | f789|/f7< 7.2; where 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, and then the aberration generated by the front lens element (i.e., the lens element formed by the first lens element L1 through the sixth lens element L6) is corrected, so as to achieve the aberration balance of the optical lens 100, thereby ensuring that the optical lens 100 obtains good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: ImgH/FNO is more than or equal to 3.7 mm; 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. Through the determination of the above relation, it can be realized that the characteristic of a large image plane is obtained under the condition that the optical lens 100 has sufficient 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 is greater than 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 element L1 to the image plane 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 element L1 to the image plane 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 optical lens 100 can be miniaturized. Meanwhile, when the above relational expression is satisfied, the large aperture effect of the optical lens 100 is facilitated to be realized, so that the optical lens 100 can obtain sufficient luminous flux in a dark environment, the imaging quality of the optical lens 100 is further ensured, and the shooting experience of a user is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: ImgH/sdmin > 4; where ImgH is the radius of the maximum effective imaging circle of the optical lens 100, and sdmin is the maximum effective radius value of the lens with the smallest effective aperture among the first lens L1 to the ninth lens L9. In order to realize a miniaturized design of the optical lens 100, when the optical lens 100 satisfies the above relational expression, the volume of the front end of the optical lens 100 may be reduced to realize an effect of miniaturizing the front end 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 smallest effective aperture from 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 above 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 of the lens with the smallest effective aperture among the first lens L1 to the ninth lens L9 of the optical lens 100 is too large, which is not favorable for the optical lens 100 to obtain the feature of a large image plane, and 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; where 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 curvature of each lens element in the optical lens system 100 are influenced by the amount of refractive power that each lens element needs to satisfy, when the optical lens system 100 satisfies the above-mentioned relational expression, the refractive power of the first lens element L1 and the second lens element L2 of the optical lens system 100 can be reasonably configured, so that the shapes and surface curvatures of the first lens element L1 and the second lens element L2 can be well controlled, and further the size of the optical lens system 100 can be controlled within a required range, so as to achieve a compact design of the optical lens system 100. Meanwhile, the proper arrangement of the refractive powers of the first lens element L1 and the second lens element L2 helps balance the tolerance sensitivities of the respective lens elements, 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 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 a filter 10, which are arranged in order from an object side to an image side along an optical axis O.

Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has negative refractive power, the seventh lens element L7 has positive refractive power, the eighth lens element L8 has positive refractive power, and the ninth lens element L9 has 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 circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, 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, respectively; 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 circumference, 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 both 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 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 both 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, respectively.

Specifically, taking the effective focal length f of the optical lens 100 as 7.49mm, the aperture value FNO of the optical lens 100 as 1.95, the field angle FOV of the optical lens 100 as 88.75 °, and the total length TTL of the optical lens 100 as 8.90mm as examples, other parameters of the optical lens 100 are given in table 1 below. The elements of the optical lens 100 from the object side to the image side along the optical axis O are 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 2 and 3 correspond to the object side surface and the image side surface of the first lens L1, respectively. The radius Y 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 O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O 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 O), the direction from the object side to the image side of the last lens of the first lens L1 is the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the left 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 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 through the ninth lens L9 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 O direction; c is the curvature at the optical axis O of the aspheric surface, 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 i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the first embodiment.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 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. The astigmatism curves represent a meridional image plane 101 curvature T and a sagittal image plane 101 curvature S, and as can be seen from (B) in fig. 2, 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 a filter 10, which are arranged in order from an object side to an image side along an optical axis O.

Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has negative refractive power, the seventh lens element L7 has positive refractive power, the eighth lens element L8 has positive refractive power, and the ninth lens element L9 has 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 circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are both 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, respectively; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, at the paraxial region O, and the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex and concave, respectively, at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex 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 both 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 both 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 both 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, respectively.

Specifically, taking the effective focal length f of the optical lens 100 as 7.46mm, the aperture value FNO of the optical lens 100 as 2, the field angle FOV of the optical lens 100 as 88.80 °, and the total length TTL of the optical lens 100 as 8.90mm as examples, other 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, thickness, and focal length in table 3 are 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 can be found in the foregoing description of the embodiments, which is not repeated herein. Table 4 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the second embodiment.

TABLE 3

TABLE 4

Referring to fig. 4, as can be seen from the light spherical aberration diagram (a) in fig. 4, the light astigmatism diagram (B) in fig. 4, and the distortion diagram (C) 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, 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 10, which are arranged in order from an object side to an image side along an optical axis O.

Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power, the eighth lens element L8 has negative refractive power, and the ninth lens element L9 has negative refractive power.

Specifically, taking the effective focal length f of the optical lens 100 as 7.48mm, the aperture value FNO of the optical lens 100 as 1.95, the field angle FOV of the optical lens 100 as 88.65 °, and the total length TTL of the optical lens 100 as 8.90mm as examples, other parameters of the optical lens 100 are given in 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 mm, and the refractive index and the 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 can be found in the description of the foregoing embodiments, which is not repeated herein. Table 6 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the third embodiment.

TABLE 5

TABLE 6

Referring to fig. 6, as can be seen from the light spherical aberration diagram (a) in fig. 6, the light astigmatism diagram (B) in fig. 6, and the distortion diagram (C) 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, 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 a filter 10, which are arranged in order from an object side to an image side along an optical axis O.

Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has negative refractive power, the seventh lens element L7 has positive refractive power, the eighth lens element L8 has positive refractive power, and the ninth lens element L9 has 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 circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, 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, respectively; 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 circumference, 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 both 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 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 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 both 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 both convex at the circumference.

Specifically, taking the effective focal length f of the optical lens 100 as 7.48mm, the aperture value FNO of the optical lens 100 as 1.941, the field angle FOV of the optical lens 100 as 88.66 °, and the total length TTL of the optical lens 100 as 8.90mm as examples, the other parameters of the optical lens 100 are given in 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 mm, and the refractive index and the 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 can be found in the description of the foregoing embodiments, which is not repeated herein. Table 8 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the fourth embodiment.

TABLE 7

TABLE 8

Referring to fig. 8, as can be seen from the light spherical aberration diagram (a) in fig. 8, the light astigmatism diagram (B) in fig. 8, and the distortion diagram (C) 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 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 a filter 10, which are arranged in order from an object side to an image side along an optical axis O.

Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power, the eighth lens element L8 has positive refractive power, and the ninth lens element L9 has 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 circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are both 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, respectively; 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 circumference, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference; 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 both 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 both convex at the circumference.

Specifically, taking the effective focal length f of the optical lens 100 as 7.54mm, the aperture value FNO of the optical lens 100 as 1.95, the field angle FOV of the optical lens 100 as 87.17 °, and the total length TTL of the optical lens 100 as 8.99mm as examples, other parameters of the optical lens 100 are given in 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 in table 9 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the 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 can be found in the description of the foregoing embodiments, which is not repeated herein. Table 10 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the fifth embodiment.

TABLE 9

Watch 10

Referring to fig. 10, as can be seen from the light spherical aberration diagram (a) in fig. 10, the light astigmatism diagram (B) in fig. 10, and the distortion diagram (C) 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, 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 a filter 10, which are arranged in order 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 circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, 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, respectively; 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 circumference, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference; 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 both 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 respectively concave and convex at the circumference.

Specifically, taking the effective focal length f of the optical lens 100 as 7.46mm, the aperture value FNO of the optical lens 100 as 1.88, the field angle FOV of the optical lens 100 as 88.84 °, and the total length TTL of the optical lens 100 as 9.00mm as examples, other parameters of the optical lens 100 are given in 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 mm, and the refractive index and the abbe number in table 11 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the 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 through the ninth lens element L9 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the description of the foregoing embodiments, which is not repeated herein. Table 12 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the sixth embodiment.

TABLE 11

TABLE 12

Referring to fig. 12, as can be seen from the light spherical aberration diagram (a) in fig. 12, the light astigmatism diagram (B) in fig. 12, and the distortion diagram (C) 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, 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.

Seventh embodiment

A schematic structural diagram of an optical lens 100 disclosed in the seventh embodiment of the present application is shown in fig. 13, 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 10, which are arranged in order 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 circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, 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, respectively; 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 circumference, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference; 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 both 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 respectively concave and convex at the circumference.

Specifically, taking the effective focal length f of the optical lens 100 as 7.46mm, the aperture value FNO of the optical lens 100 as 1.79, the field angle FOV of the optical lens 100 as 88.82 °, and the total length TTL of the optical lens 100 as 9.05mm as examples, the other parameters of the optical lens 100 are given in table 13 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 13 are mm, and the refractive index and the abbe number in table 13 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the 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 through the ninth lens element L9 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the description of the foregoing embodiments, which is not repeated herein. Table 14 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the seventh embodiment.

Watch 13

TABLE 14

Referring to fig. 14, as can be seen from the light spherical aberration diagram (a) in fig. 14, the light astigmatism diagram (B) in fig. 14, and the distortion diagram (C) 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, as for the wavelengths corresponding to the curves in fig. 14 (a), fig. 14 (B), and fig. 14 (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 15, table 15 summarizes ratios of the relations in the first embodiment to the seventh embodiment of the present application.

Watch 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 a camera module 200, where the camera module 200 includes an image sensor 201 and the optical lens 100 according to any of the first to seventh embodiments, the image sensor 201 is disposed at 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 again. It can be understood that the camera module 200 having the optical lens 100 can not only achieve a compact design of the whole module, but also achieve high-quality imaging of the camera module 200.

Referring to fig. 16, the present application further discloses an electronic apparatus 300, wherein the electronic apparatus 300 includes a housing and the camera module 200 as described above, and the camera module 200 is disposed on the housing. The electronic equipment 300 with the camera module 200 can meet the requirement of miniaturization, and can also realize a high-quality imaging effect, 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 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 includes 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 this 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 refractive power has a convex image-side surface at 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 thereof and a convex image-side surface at a paraxial region thereof;

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 thereof and a concave image-side surface at a paraxial region thereof;

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

the optical lens satisfies the following relation:

2<r91/f9<3；

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

2. An optical lens according to claim 1, wherein 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 thickness of the fifth lens element on the optical axis, and ct6 is a thickness of the sixth lens element on the optical axis.

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

1.5<etmax/etmin<2.1；

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

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

-1.1<(f*0.1)/sag81<-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 element and the optical axis to a maximum effective radius of the object-side surface of the eighth lens element in the optical axis direction.

5. An optical lens according to claim 1, wherein 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.

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

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

ImgH/sdmin＞4；

wherein ImgH is a radius of a maximum effective imaging circle of the optical lens, and sdmin is a maximum effective radius value of a lens with a smallest effective aperture among the first lens to the ninth lens.

8. An optical lens according to claim 1, wherein 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 and second lenses.

9. A camera module, comprising an optical lens according to any one of claims 1 to 8 and an image sensor, 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.