CN114167582B

CN114167582B - Optical lens, camera module and electronic equipment

Info

Publication number: CN114167582B
Application number: CN202111395233.2A
Authority: CN
Inventors: 谢晗; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2023-07-04
Anticipated expiration: 2041-11-23
Also published as: CN114167582A

Abstract

The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is provided with positive focal power, an object side surface and an image side surface of the first lens are respectively convex and concave at a paraxial region, the second lens is provided with positive focal power, an object side surface of the second lens is provided with convex at the paraxial region, the third lens is provided with negative focal power, an image side surface of the third lens is concave at the paraxial region, the fourth lens is provided with negative focal power, the fifth lens is provided with positive focal power, an object side surface and an image side surface of the fifth lens are respectively concave and convex at the paraxial region, the sixth lens is provided with negative focal power, and an object side surface and an image side surface of the seventh lens are respectively convex and concave at the paraxial region. The optical lens, the camera module and the electronic equipment can realize miniaturization, light weight and large aperture effect.

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

In recent years, with the progress of the scientific industry, imaging technology is continuously developed, and optical lenses for optical imaging are widely used in electronic devices such as smart phones, tablet computers, cameras, and the like. Taking a smart phone as an example, in order to improve the shooting effect, one of the most important check indexes of the optical lens is resolution, and it is also important to enlarge the aperture and increase the brightness. Therefore, in the field of optical lens design, not only the miniaturization and thinness of the lens shape are required, but also the quality and performance of the imaging of the lens must be considered. However, under the constraint of the chip process technology, it becomes difficult to continuously reduce the size of a single pixel point of the imaging chip, and if the number of pixels is to be increased, the method of enlarging the size of the chip is often adopted, which brings about a higher difficulty in correcting the aberration of light and compressing the volume of the lens.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, which can realize the effects of large aperture and high pixel of the optical lens while realizing the miniaturization and the light and thin design of the optical lens.

In order to achieve the above object, a first aspect of 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, and a seventh lens disposed in order from an object side to an image side along an optical axis;

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

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

the third lens has negative focal power, and the image side surface of the third lens is a concave surface at a paraxial region;

the fourth lens has negative focal power;

the fifth lens element has positive refractive power, wherein an object-side surface of the fifth lens element is concave at a paraxial region thereof, and an image-side surface of the fifth lens element is convex at a paraxial region thereof;

the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface at a paraxial region;

the seventh lens element has negative refractive power, wherein an object-side surface of the seventh lens element is convex at a paraxial region thereof, and an image-side surface of the seventh lens element is concave at a paraxial region thereof;

the optical lens satisfies the following relation:

2< ImgH x 2/EPD <3, wherein ImgH is the radius of the maximum effective imaging circle of the optical lens and EPD is the entrance pupil diameter of the optical lens.

In the optical lens provided by the application, the first lens has positive focal power, the object side surface and the image side surface of the first lens are respectively convex and concave in the paraxial region, the second lens is matched with the first lens to have positive focal power, and the object side surface of the second lens is convex in the paraxial region, so that light rays emitted into the optical lens can be converged. The third lens and the fourth lens have negative focal power, and the spherical aberration generated by the first lens and the second lens can be corrected by utilizing the third lens and the fourth lens in cooperation with the design that the image side surface of the third lens is concave at the paraxial region, so that the resolution capability of the optical lens on images is improved. The fifth lens provides positive focal power, can cooperate first lens, second lens further to realize light and assemble, simultaneously, the thing side of fifth lens, image side are concave surface and convex surface respectively in paraxial region department, can control the length of fifth lens self to be favorable to shortening the whole length of optical lens, also be favorable to reducing the self sensitivity of fifth lens simultaneously, be convenient for shaping. In addition, the sixth lens element and the seventh lens element provide negative power, and the object-side surface and the image-side surface of the seventh lens element are concave at the paraxial region thereof, so as to correct the defects of distortion, astigmatism, field curvature and the like generated when incident light passes through the first lens element to the sixth lens element, thereby realizing the imaging requirements of low aberration and high quality of the optical lens element. Furthermore, the optical lens satisfies the relation: when 2< ImgH 2/EPD <3, as much light as possible can enter the optical lens, so that the relative brightness of the edge view field is high, the imaging effect is bright, the imaging definition of the optical lens is improved, and the effects of large aperture and high pixel are met.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: because the size of a single pixel unit is limited by a processing technology and is difficult to continuously shrink, when the ImgH is more than or equal to 4mm, the optical lens can be used for carrying a large-size photosensitive element when being applied to an imaging module, so that distortion and field curvature generated by the optical lens can be reduced, and the imaging resolution of the optical lens can 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: the optical lens satisfies the following relation:

-7<(R9+R10)/f5<0；

wherein R9 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, R10 is a radius of curvature of the image side surface of the fifth lens element at the optical axis, and f5 is a focal length of the fifth lens element.

In the foregoing, the object-side surface of the fifth lens element is concave at the paraxial region, and the image-side surface of the fifth lens element is convex at the paraxial region, i.e., the fifth lens element is entirely in the shape of a meniscus lens element, which is beneficial to shortening the length of the fifth lens element and shortening the overall length of the optical lens element. Meanwhile, the curvature radius of the object side surface and the image side surface of the fifth lens at the optical axis and the focal length of the fifth lens are limited, so that the field curvature of the optical lens in the sagittal direction and the meridional direction can be controlled, and the optical lens can ensure higher resolving power. When the object-side surface of the fifth lens element is less than the lower limit of the above-mentioned relation, the curvature radius of the object-side surface of the fifth lens element at the paraxial region becomes larger, and the object-side surface of the fifth lens element is flatter, which results in insufficient positive optical power provided by the fifth lens element and is unfavorable for shortening the back focal length of the optical lens element. When the ratio is higher than the upper limit of the relation, the curvature radius of the object side surface of the fifth lens element at the paraxial region becomes smaller, and the positive power provided by the fifth lens element is excessively large, so that the spherical aberration correction of the optical lens element becomes difficult.

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

-5<f12/f34*10<-3；

wherein f12 is a combined focal length of the first lens and the second lens, and f34 is a combined focal length of the third lens and the fourth lens.

As can be seen from the foregoing, the first lens and the second lens combination provide positive optical power, and the third lens and the fourth lens combination provide negative optical power, i.e. when the above relation is satisfied, the first lens and the second lens can achieve light converging, and the appropriate negative optical power of the third lens and the fourth lens can correct spherical aberration generated by the first lens and the second lens, so as to improve the imaging resolution capability of the optical lens. When the focal length of the third lens element is lower than the lower limit of the relation, the combined focal length of the third lens element and the fourth lens element becomes smaller, so that the negative focal power of the third lens element and the fourth lens element becomes stronger, and the higher-order aberration of the optical lens element is increased, thereby affecting the imaging quality of the optical lens element. When the amount of the refractive index is higher than the upper limit of the above-mentioned relation, the combined angle of the third lens and the fourth lens becomes large, so that the negative power of the third lens and the fourth lens becomes weak, and it is difficult to sufficiently correct spherical aberration generated by the first lens and the second lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2< (T1+T2)/f <0.3;

wherein T1 is the thickness of the first lens along the optical axis, T2 is the thickness of the second lens along the optical axis, and f is the effective focal length of the optical lens.

Through the thickness (namely the center thickness) of the first lens and the second lens on the optical axis, the optical lens can be provided with a large aperture, and meanwhile, the processing and forming process can be considered, so that the forming difficulty of the first lens and the second lens is reduced. When the relation is lower than the lower limit, the center thicknesses of the first lens and the second lens are thinner, the outer diameters of the first lens and the second lens are synchronously increased under the condition of larger entrance pupil diameter, and the thinner lenses are not beneficial to injection molding, so that the processing difficulty of the first lens and the second lens is increased, and the imaging quality of the optical lens is also influenced. When the relation is higher than the upper limit, the thicknesses of the first lens and the second lens are thicker, so that the overall thickness of the optical lens is larger, and the miniaturization design of the optical lens is not facilitated.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2< ΣP/TTL <0.35;

Wherein Σp is the sum of air gaps of the first lens to the seventh lens in the optical axis direction, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis (i.e., the total length of the optical lens).

Because the optical lens of this application is mainly used to match the jumbo size chip, consequently, the volume of optical lens can increase simultaneously, based on this, the optical lens of this application realizes compressing the overall length of optical lens through optimizing the clearance between each lens for the optical lens can satisfy miniaturized design requirement, and then makes the optical lens carry on frivolous electronic equipment. When the ratio of the above relation is higher than the upper limit, the gap interval between the lenses is large, the total length of the optical lens is not sufficiently compressed, and the miniaturization design requirement of the optical lens cannot be satisfied. When the ratio of the above relation is lower than the lower limit, the air gap between the lenses is small, which results in insufficient light deflection space, and it is difficult to sufficiently correct the aberration, which affects the imaging quality of the optical lens. Meanwhile, because the air gap between the lenses is small, the assembling difficulty of the lenses of the optical lens is high, and the assembling yield of the optical lens is affected.

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< (t6+p6+t7)/BFL <1.7;

wherein T6 is the thickness of the sixth lens element along the optical axis, P6 is the air gap between the sixth lens element and the seventh lens element along the optical axis, T7 is the thickness of the seventh lens element along the optical axis, and BFL is the distance between the image side surface of the seventh lens element and the imaging surface of the optical lens element along the optical axis, i.e., the back focal length of the optical lens element.

Since the sixth lens and the seventh lens provide negative focal power, the back focal length of the optical lens can be effectively controlled, and the optical lens can be ensured to have enough back Jiao Pipei chips under the condition that the total length of the optical lens is not excessively compressed. When the ratio of the above relation is higher than the upper limit, the thicknesses of the sixth lens and the seventh lens are not sufficiently compressed, which is not beneficial to the miniaturization design of the optical lens. When the ratio of the relational expression is lower than the lower limit, the thicknesses of the sixth lens and the seventh lens are thinner, and the thinner lenses are not beneficial to processing and forming, so that the processing difficulty of the sixth lens and the seventh lens is increased.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 110< v3+v4+v6+v7<150;

Wherein V3 is the abbe number of the third lens, V4 is the abbe number of the fourth lens, V6 is the abbe number of the sixth lens, and V7 is the abbe number of the seventh lens.

When the relation is satisfied, the degree of deflection of the light passing through the lenses (namely the third lens, the fourth lens, the sixth lens and the fourth lens) providing the negative focal power can be controlled, so that the aberration correction capability of the lenses providing the negative focal power can be enhanced, chromatic aberration can be balanced, and the resolution of the optical lens can be improved.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes a photosensitive chip and the optical lens described in the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can realize the effects of large aperture and high pixel while meeting the miniaturization and light and thin design.

In a third aspect, the invention also discloses an electronic device, which comprises a housing and the camera module set in the second aspect, wherein the camera module set is arranged in the housing. The electronic equipment with the camera module can effectively realize the effects of large aperture and high pixel while meeting the miniaturization and light-weight design.

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

the optical lens, the camera module and the electronic equipment provided by the embodiment of the invention adopt seven-piece lenses, and the focal power and the surface of each lens are designed, so that the optical lens can realize the design requirements of miniaturization and thinness, and simultaneously, the optical lens meets the relation: when 2< ImgH 2/EPD <3, as much light as possible can enter the optical lens, so that the relative brightness of the edge view field is high, the imaging effect is bright, the imaging definition of the optical lens is improved, and the effects of large aperture and high pixel are met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 invention, 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 longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the first embodiment of the present application;

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

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

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

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

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

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

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

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

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

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

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

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

Detailed Description

The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

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 invention 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, and a seventh lens L7 sequentially disposed from an object side to an image side along an optical axis O. In imaging, light enters the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in order from the object side of the first lens L1 and finally is imaged on the imaging surface 101 of the optical lens 100. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has negative power, the fourth lens L4 has negative power, the fifth lens L5 has positive power, and the sixth lens L6 and the seventh lens L7 both have negative power.

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

The object-side surface 11 and the image-side surface of the first lens element L1 are convex and concave, respectively, near the circumference, the object-side surface 21 of the second lens element L2 can be concave or convex, and the image-side surface 22 of the second lens element L2 is convex. The object-side surface 31 of the third lens element L3 can be convex or concave at a near circumference, and the image-side surface 32 of the third lens element L3 can be concave or convex at a near circumference. The object-side surface 41 and the image-side surface 42 of the fourth lens element L4 can be concave and convex, respectively, near the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 can be concave and convex, respectively, near the circumference. The object-side surface 61 and the image-side surface 62 of the sixth lens element L6 can be concave and convex, respectively, at a near circumference. The object-side surface 71 of the seventh lens element L7 can be concave or convex near the circumference, and the image-side surface 72 of the seventh lens element L7 can be convex near the circumference.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 may be aspheric lenses. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. It is understood that in other embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 may be spherical lenses.

Optionally, 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 and the seventh lens L7 may be plastic, and the plastic lens can effectively reduce the weight of the optical lens 100 and reduce the production cost thereof. It is understood that in other embodiments, 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 and the seventh lens L7 can be glass, and the glass lens can have better optical performance. Alternatively, in the seven lenses, a part of the lenses may be made of glass, and the other part of the lenses may be made of plastic. The material settings of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh transparent lens L7 are not particularly limited in this embodiment as long as the optical performance requirements can be satisfied.

In some embodiments, the optical lens 100 further includes a diaphragm 102, and the diaphragm 102 may be an aperture diaphragm and/or a field diaphragm, which may be disposed between the object side surface 11 of the first lens L1 and the object plane of the optical lens 100. Alternatively, the diaphragm 102 may be located between two adjacent lenses, for example, between the first lens L1 and the second lens L2, between the third lens L3 and the fourth lens L4, etc., and the specific position of the diaphragm 102 may be adjusted according to the actual design requirement, which is not limited in this embodiment.

Optionally, to improve imaging quality, the optical lens 100 further includes an infrared filter 80, where the infrared filter 80 is disposed between the seventh image side surface 72 of the seventh lens L7 and the imaging surface 101 of the optical lens 100. By adopting the arrangement of the infrared filter 80, the infrared light passing through the seventh lens L7 can be effectively filtered, so that the imaging definition of the shot object on the image side is ensured, and the imaging quality is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< ImgH x 2/EPD <3, wherein ImgH is the radius of the maximum effective imaging circle of the optical lens and EPD is the entrance pupil diameter of the optical lens.

In the optical lens provided by the application, when the optical lens satisfies the relation 2< ImgH 2/EPD <3, as much light as possible can enter the optical lens, so that the relative brightness of the edge view field is high, the imaging effect is bright, the imaging definition of the optical lens is improved, and the effects of large aperture and high pixel are satisfied. When the relation is not satisfied, the light entering the optical lens is smaller, so that the relative brightness of the edge view field is weaker, and the imaging definition angle of the optical lens cannot satisfy the effects of large aperture and high pixel.

In some embodiments, the optical lens 100 satisfies the following relationship: imgH is more than or equal to 4mm; because the size of a single pixel unit is limited by the processing technology, the size is difficult to continuously shrink, when ImgH is more than or equal to 4mm, the optical lens 100 can be used for carrying a large-size photosensitive element when being applied to an imaging module, so that distortion and curvature of field generated by the optical lens 100 can be reduced, and further, the imaging resolution of the optical lens 100 can be improved.

In some embodiments, the optical lens 100 satisfies the following relationship: -7< (r9+r10)/f 5<0, R9 is a radius of curvature of the object-side surface of the fifth lens element at the optical axis, R10 is a radius of curvature of the image-side surface 52 of the fifth lens element L5 at the optical axis, and f5 is a focal length of the fifth lens element L5. As can be seen from the foregoing, the object-side surface 51 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface 52 is convex at the paraxial region, i.e., the entire fifth lens element L5 is shaped as a meniscus lens element, which is beneficial to shortening the length of the fifth lens element L5 and thus the overall length of the optical lens assembly 100. Meanwhile, the curvature radius of the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 at the optical axis and the focal length of the fifth lens element L5 are defined, so that the field curvature in the sagittal direction and the meridional direction of the optical lens 100 can be controlled, and the optical lens 100 can ensure higher resolving power. When the lower limit of the above relation is lower, the curvature radius of the object-side surface 51 of the fifth lens element L5 at the paraxial region becomes larger, and the object-side surface 51 of the fifth lens element L5 is flatter, resulting in insufficient positive power provided by the fifth lens element L5, which is detrimental to shortening the back focal length of the optical lens 100. When the upper limit of the relationship is higher, the curvature radius of the object-side surface 51 of the fifth lens element L5 at the paraxial region becomes smaller, and the positive power provided by the fifth lens element L5 is too large, which makes it difficult to correct the spherical aberration of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: the optical lens 100 satisfies the following relationship: -5< f12/f34 x 10< -3;

wherein f12 is a combined focal length of the first lens L1 and the second lens L2, and f34 is a combined focal length of the third lens L3 and the fourth lens L4.

As can be seen from the foregoing, the combination of the first lens element L1 and the second lens element L2 provides positive focal power, and the combination of the third lens element L3 and the fourth lens element L4 provides negative focal power, i.e., when the above-mentioned relationship is satisfied, the first lens element L1 and the second lens element L2 can achieve light converging, and the appropriate negative focal power of the third lens element L3 and the fourth lens element L4 can correct the spherical aberration generated by the first lens element L1 and the second lens element L2, so as to improve the image resolution of the optical lens 100. When the combined focal length of the third lens element L3 and the fourth lens element L4 is smaller than the lower limit of the above-mentioned relation, the negative power of the third lens element L3 and the fourth lens element L4 is increased, and the higher-order aberration of the optical lens 100 is increased, which affects the imaging quality of the optical lens 100. When the upper limit of the above relation is exceeded, the combined angle of the third lens L3 and the fourth lens L4 becomes large, so that the negative power of the third lens L3 and the fourth lens L4 becomes weak, and it is difficult to sufficiently correct the spherical aberration generated by the first lens L1 and the second lens L2.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< (T1+T2)/f <0.3;

wherein T1 is the thickness of the first lens L1 along the optical axis, T2 is the thickness of the second lens L2 along the optical axis, and f is the effective focal length of the optical lens 100.

By reasonably configuring the thicknesses (i.e., the center thicknesses) of the first lens L1 and the second lens L2 on the optical axis, the optical lens 100 can configure a large aperture, and meanwhile, the processing and molding process can be considered, so that the molding difficulty of the first lens L1 and the second lens L2 is reduced. When the above relation is lower than the lower limit, the center thicknesses of the first lens L1 and the second lens L2 are thinner, and the outer diameters of the first lens L1 and the second lens L2 are synchronously increased under the condition of larger entrance pupil diameters, and the thinner lenses are unfavorable for injection molding, so that the processing difficulty of the first lens L1 and the second lens L2 is increased, and the imaging quality of the optical lens 100 is also affected. When the above relation is higher than the upper limit, the thicknesses of the first lens L1 and the second lens L2 are too thick, which results in a larger overall thickness of the optical lens 100, which is not beneficial to the miniaturization design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< ΣP/TTL <0.35; where Σp is the sum of the air gaps of the first lens L1 to the seventh lens L7 in the optical axis direction, and TTL is the distance between the object side surface 11 of the first lens L1 and the imaging surface 101 of the optical lens 100 in the optical axis (i.e., the total length of the optical lens 100).

Because the optical lens 100 of the present application is mainly used for matching a large-sized chip, the volume of the optical lens 100 can be synchronously increased, based on this, the optical lens 100 of the present application realizes the total length of the compressed optical lens 100 by optimizing the gap between the lenses, so that the optical lens 100 can meet the design requirement of miniaturization, and further the optical lens 100 can be mounted on the light and thin electronic device. When the ratio of the above-mentioned relation is higher than the upper limit, the gap interval between the lenses is large, the total length of the optical lens 100 is not sufficiently compressed, and the miniaturization design requirement of the optical lens 100 cannot be satisfied. When the ratio of the above relation is lower than the lower limit, the air gap between the lenses is small, resulting in insufficient light deflection space, which makes it difficult to sufficiently correct the aberration and affects the imaging quality of the optical lens 100. Meanwhile, since the air gap between the lenses is small, the difficulty of assembling the lenses of the optical lens 100 is high, and the assembly yield of the optical lens 100 is affected.

In some embodiments, the optical lens 100 further satisfies the following relationship: 1.1< (t6+p6+t7)/BFL <1.7; where T6 is the thickness of the sixth lens L6 along the optical axis, P6 is the air gap between the sixth lens L6 and the seventh lens L7 along the optical axis, T7 is the thickness of the seventh lens L7 along the optical axis, and BFL is the distance between the image side surface 72 of the seventh lens L7 and the imaging surface 101 of the optical lens 100 on the optical axis, that is, the back focal length of the optical lens 100.

Since the sixth lens L6 and the seventh lens L7 provide negative power, the back focal length of the optical lens 100 can be effectively controlled, and the optical lens 100 can be ensured to have a sufficient back Jiao Pipei chip without excessively compressing the total length of the optical lens 100. When the ratio of the above relation is higher than the upper limit, the thicknesses of the sixth lens L6 and the seventh lens L7 are not sufficiently compressed, which is disadvantageous for the miniaturization design of the optical lens 100. When the ratio of the above relation is lower than the lower limit, the thicknesses of the sixth lens L6 and the seventh lens L7 are thinner, and the thinner lenses are unfavorable for processing and forming, so that the processing difficulty of the sixth lens L6 and the seventh lens L7 is increased.

In some embodiments, the optical lens 100 also satisfies the following relationship: 110< v3+v4+v6+v7<150; wherein V3 is the abbe number of the third lens L3, V4 is the abbe number of the fourth lens L4, V6 is the abbe number of the sixth lens L6, and V7 is the abbe number of the seventh lens L7.

When the above relation is satisfied, the degree of deflection of the light passing through the lenses providing negative power (i.e., the third lens L3, the fourth lens L4, the sixth lens L6, and the fourth lens L7) can be controlled, which is beneficial to enhancing the aberration correction capability of the lenses providing negative power, balancing chromatic aberration, and further improving the resolution of the optical lens 100.

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

First embodiment

As shown in fig. 1, the optical lens 100 according to the first embodiment of the present application includes a 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, and an infrared filter 80, which are sequentially disposed from an object side to an image side along an optical axis O.

The powers of the seven lenses of the first lens element L1 to the seventh lens element L7 are described in the above embodiments, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region, respectively, the object-side surface 21 of the second lens element L2 is convex at the paraxial region, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region. The object-side surface 31 of the third lens element L3 is convex at a paraxial region, and the image-side surface 32 of the third lens element L3 is concave at a paraxial region. The object-side surface 41 of the fourth lens element L4 is convex at a paraxial region, and the image-side surface 42 of the fourth lens element L4 is concave at a paraxial region. The object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at a paraxial region thereof. The object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex and concave at a paraxial region thereof. The object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave at a paraxial region thereof.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave, respectively, at a near circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex, respectively, at a near circumference, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave, respectively. The object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, near the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, near 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 a near circumference, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex at a near circumference.

Further, the object side surface and the image side surface of the seven lenses are aspheric. The parameter formula of the non-curved surface is as follows:

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 i-th order of the aspherical surface. The higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical lenses in the first embodiment are given in table 2 below.

Further, the seven lenses are all made of plastic, so that the overall weight of the optical lens 100 is reduced, and the design of the optical lens is facilitated to be light and thin.

Taking the focal length f= 5.107mm of the optical lens 100, the field angle fov= 75.43 ° of the optical lens 100, the aperture size fno=1.59 as an example, the total length ttl=6.46 mm of the optical lens, other parameters of the optical lens 100 are given in the following tables 1 and 2, respectively. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object-side surface of the lens element, and the surface with larger surface number is the image-side surface of the lens element, and the

surface numbers

1 and 2 correspond to the first object-side surface L10 and the first image-side surface L12 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 row of the first lens element L1 is the thickness (center thickness) of the lens element on the optical axis O, and the second value is the distance from the image side surface of the lens element to the object side surface of the latter lens element on the optical axis O. The value of the aperture 102 in the "thickness" parameter row is the distance between the aperture 102 and the object-side vertex of the following lens element (the vertex refers to the intersection point of the lens element and the optical axis O) on the optical axis O, and the direction from the object-side surface of the first lens element L1 to the image-side surface of the last lens element is the positive direction of the optical axis O by default, when the value is negative, it indicates that the aperture 102 is disposed on the image side of the object-side vertex of the following lens element, and when the thickness of the aperture 102 is positive, the aperture 102 is on the object side of the object-side vertex of the following lens element. Table 2 is a table of relevant parameters of the aspherical surface of each lens in table 1, where k is a conic coefficient and Ai is an i-th order aspherical coefficient. The refractive index, abbe number and focal length of each lens are values at a reference wavelength (e.g., 587.6 nm). It is understood that the units of Y radius, thickness, and focal length in Table 1 are all mm.

TABLE 1

TABLE 2

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

Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587.6nm in the first embodiment. The astigmatic curve represents the sub-imaging surface curvature T and the arc-loss imaging surface curvature S, wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height. As can be seen from fig. 2 (B), the astigmatism of the optical lens 100 is well compensated.

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 587.6 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from fig. 2 (C), the distortion of the optical lens 100 becomes well corrected at the wavelength of 587.6 nm.

Second embodiment

Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present disclosure. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from the object side to the image side along an optical axis O.

The powers of the seven lenses of the first lens element L1 to the seventh lens element L7 are described in the above embodiments, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region, respectively, the object-side surface 21 of the second lens element L2 is convex at the paraxial region, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region. The object-side surface 31 of the third lens element L3 is convex at a paraxial region, and the image-side surface 32 of the third lens element L3 is concave at a paraxial region. The object-side surface 41 of the fourth lens element L4 is concave at a paraxial region, and the image-side surface 42 of the fourth lens element L4 is concave at a paraxial region. The object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at a paraxial region thereof. The object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex and concave at a paraxial region thereof. The object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave at a paraxial region thereof.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave, respectively, at a near circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex, respectively, at a near circumference, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave, respectively. The object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, near the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, near 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 a near circumference, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively concave and convex at a near circumference.

Further, the object side surface and the image side surface of the seven lenses are aspheric. The seven lenses are all made of plastic, so that the overall weight of the optical lens 100 is reduced, and the design of the optical lens is facilitated to be light and thin.

In the second embodiment, the focal length f= 5.233mm of the optical lens 100, the field angle fov= 73.99 ° of the optical lens 100, the aperture size fno=1.5, and the total length ttl=6.8 mm of the optical lens are taken as an example.

Other parameters in this second embodiment are given in the following tables 3 and 4, and the definition of each parameter can be obtained from the description of the foregoing embodiment, which is not repeated here. The refractive index, abbe number and focal length of each lens are values at a reference wavelength (e.g., 587.6 nm). It is understood that the units of Y radius, thickness, and focal length in Table 3 are all mm. The higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the second embodiment are given in table 4 below.

TABLE 3 Table 3

TABLE 4 Table 4

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

Third embodiment

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from the object side to the image side along an optical axis O.

The powers of the seven lenses of the first lens element L1 to the seventh lens element L7 are described in the above embodiments, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region, respectively, the object-side surface 21 of the second lens element L2 is convex at the paraxial region, and the image-side surface 22 of the second lens element L2 is convex at the paraxial region. The object-side surface 31 of the third lens element L3 is concave at a paraxial region, and the image-side surface 32 of the third lens element L3 is concave at a paraxial region. The object-side surface 41 of the fourth lens element L4 is convex at a paraxial region, and the image-side surface 42 of the fourth lens element L4 is concave at a paraxial region. The object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at a paraxial region thereof. The object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex and concave at a paraxial region thereof. The object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave at a paraxial region thereof.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave, respectively, at the near-circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex, respectively, at the near-circumference, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex, respectively. The object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, near the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, near 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 a near circumference, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex at a near circumference.

In the third embodiment, the focal length f= 4.766mm of the optical lens 100, the field angle fov=80° of the optical lens 100, the aperture size fno=1.6, and the total length ttl=6.9 mm of the optical lens are taken as an example.

Other parameters in this third embodiment are given in the following tables 5 and 6, and the definition of each parameter can be derived from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 5 are all mm. The higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical lenses in the third embodiment are given in table 6 below.

TABLE 5

TABLE 6

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

Fourth embodiment

Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present disclosure. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from the object side to the 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 a near-circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively concave and convex at a near-circumference, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively concave at a near-circumference. The object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, near the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, near 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 a near circumference, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex at a near circumference.

In the fourth embodiment, the focal length f= 5.073mm of the optical lens 100, the field angle fov=76° of the optical lens 100, the aperture size fno=1.5, and the total length ttl=6.98 mm of the optical lens are taken as an example.

Other parameters in this fourth embodiment are given in the following tables 7 and 8, and the definition of each parameter can be derived from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 7 are all mm. The following table 8 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the first embodiment.

TABLE 7

TABLE 8

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

Fifth embodiment

Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present disclosure. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from the object side to the image side along an optical axis O.

The powers of the seven lenses of the first lens element L1 to the seventh lens element L7 are described in the above embodiments, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region, respectively, the object-side surface 21 of the second lens element L2 is convex at the paraxial region, and the image-side surface 22 of the second lens element L2 is convex at the paraxial region. The object-side surface 31 of the third lens element L3 is convex at a paraxial region, and the image-side surface 32 of the third lens element L3 is concave at a paraxial region. The object-side surface 41 of the fourth lens element L4 is concave at a paraxial region, and the image-side surface 42 of the fourth lens element L4 is concave at a paraxial region. The object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at a paraxial region thereof. The object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex and concave at a paraxial region thereof. The object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave at a paraxial region thereof.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave, respectively, near the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, near the circumference, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave, respectively. The object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, near the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, near 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 a near circumference, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively concave and convex at a near circumference.

Other parameters in this fifth embodiment are given in the following tables 9 and 10, and the definition of each parameter can be derived from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 9 are all mm. The following table 10 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fifth embodiment.

TABLE 9

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Table 10

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

Sixth embodiment

Fig. 11 is a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present disclosure. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from the object side to the image side along an optical axis O.

The powers of the seven lenses of the first lens element L1 to the seventh lens element L7 are described in the above embodiments, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region, respectively, the object-side surface 21 of the second lens element L2 is convex at the paraxial region, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region. The object-side surface 31 of the third lens element L3 is convex at a paraxial region, and the image-side surface 32 of the third lens element L3 is concave at a paraxial region. The object-side surface 41 of the fourth lens element L4 is concave at a paraxial region, and the image-side surface 42 of the fourth lens element L4 is convex at a paraxial region. The object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at a paraxial region thereof. The object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at a paraxial region. The object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex and concave at a paraxial region thereof.

Other parameters in this sixth embodiment are given in the following tables 11 and 12, and the definition of each parameter can be derived from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 11 are all mm. The following table 12 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fifth embodiment.

TABLE 11

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Table 12

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

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

TABLE 13

Relation/embodiment	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment	Sixth embodiment
							2<ImgH*2/EPD<3	2.488	2.294	2.685	2.365	2.336	2.569
ImgH≥4mm	4mm	4mm	4mm	4mm	4mm	4.8mm
							0.2<ΣP/TTL<0.35	0.256	0.285	0.317	0.260	0.261	0.248
-7<(R9+R10)/f5<0	-2.074	-2.833	-3.164	-6.532	-3.332	-1.899
							-5<f12/f34*10<-3	-3.539	-4.671	-4.701	-4.903	-4.665	-3.012
1.1<(T6+P6+T7)/BFL<1.7	1.334	1.146	1.191	1.292	1.317	1.640
							110<V3+V4+V6+V7<150	116.880	149.250	116.880	122.130	120.830	118.970
0.2<(T1+T2)/f<0.3	0.225	0.234	0.228	0.264	0.257	0.209

Referring to fig. 13, the present application further discloses an image capturing module 200, which includes a photosensitive chip 201 and the optical lens 100 according to any one of the first to sixth embodiments, wherein the photosensitive chip 201 is disposed on an image side of the optical lens 100. The optical lens 100 is configured to receive an optical signal of a subject and project the optical signal to the photo-sensing chip 201, and the photo-sensing chip 201 is configured to convert the optical signal corresponding to the subject into an image signal. It can be appreciated that the image capturing module 200 having the optical lens 100 has all the technical effects of the optical lens 100, that is, the effects of large aperture and high pixel of the optical lens 100 can be achieved while the optical lens 100 is miniaturized and thinned.

Referring to fig. 14, the present application further discloses an electronic device 300, where the electronic device 300 includes a housing 301 and the above-mentioned camera module 200, and the camera module 200 is disposed in the housing 301. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, etc. It can be appreciated that the electronic device 300 having the image capturing module 200 also has all the technical effects of the optical lens 100. That is, the optical lens 100 can be miniaturized and thinned, and the large aperture and high pixel effect of the optical lens 100 can be achieved.

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, characterized in that: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis;

the fourth lens has negative focal power;

the lens with the refractive power of the optical lens is the seven-lens;

The optical lens satisfies the following relation:

2<ImgH*2/EPD<3，

ImgH is larger than or equal to 4mm, wherein ImgH is the radius of the maximum effective imaging circle of the optical lens, and EPD is the entrance pupil diameter of the optical lens.

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

-7<(R9+R10)/f5<0；

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

-5<f12/f34*10<-3；

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

0.2<(T1+T2)/f<0.3；

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

0.2<ΣP/TTL<0.35；

Wherein Σp is the sum of air gaps between the first lens and the seventh lens in the optical axis direction, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens in the optical axis.

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

1.1<(T6+P6+T7)/BFL<1.7；

wherein T6 is the thickness of the sixth lens element along the optical axis, P6 is the air gap between the sixth lens element and the seventh lens element along the optical axis, T7 is the thickness of the seventh lens element along the optical axis, and BFL is the distance from the image side surface of the seventh lens element to the image plane of the optical lens element along the optical axis.

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

110<V3+V4+V6+V7<150；

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

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