CN113777751B

CN113777751B - Optical lens, camera module and electronic equipment

Info

Publication number: CN113777751B
Application number: CN202111062148.4A
Authority: CN
Inventors: 乐宇明; 赵迪; 兰宾利; 周芮; 王欢; 朱志鹏; 请求不公布姓名
Original assignee: Jiangxi Oufei Optics Co ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2023-12-15
Anticipated expiration: 2041-09-10
Also published as: CN113777751A

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises a first lens with negative focal power, wherein the first lens is sequentially arranged from an object side to an image side along an optical axis; a second lens having negative optical power, the image-side surface of which is convex; a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex; a fourth lens having positive optical power; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; a sixth lens element with negative refractive power having concave object-side and image-side surfaces; the seventh lens with positive focal power has a convex object side surface and a convex image side surface. The optical lens also satisfies the relation: f/EPD is 1.1.ltoreq.f.ltoreq.1.6. The optical lens, the camera module and the electronic equipment provided by the embodiment of the invention can realize the design requirement of a large aperture of a vehicle-mounted system and improve the imaging quality.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the development of the vehicle-mounted industry, in order to provide better driving experience for drivers, cameras are widely applied to various vehicle-mounted systems (such as advanced driving assistance systems (i.e. Advanced Driving Assistance System), driving recording systems, reversing images, etc.), so as to realize functions of automatic driving, monitoring, etc. of automobiles. However, under the development trend of miniaturization of the optical lens, how to realize the large aperture characteristic of the optical lens and the wide angle characteristic at the same time, and further realize high-quality imaging of the optical lens and the camera is a technical problem which needs to be solved at present.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the design requirements of a large aperture and a wide angle of a vehicle-mounted system and improve imaging quality.

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 has negative optical power;

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

the third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex at a paraxial region;

the fourth lens has positive focal power;

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

the sixth lens is provided with negative focal power, and the object side surface and the image side surface of the sixth lens are concave surfaces at a paraxial region;

the seventh lens is provided with positive focal power, and the object side surface and the image side surface of the seventh lens are both convex surfaces at a paraxial region;

The optical lens satisfies the following relation:

1.1≤f/EPD≤1.6；

where f is the effective focal length of the optical lens and EPD is the entrance pupil diameter of the optical lens.

In the optical lens provided by the embodiment, the first lens and the second lens with negative focal power are adopted, and the image side surface of the second lens is convex at the paraxial region, so that the first lens and the second lens can be favorable for converging light rays injected into the optical lens. The third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex at the paraxial region, so that the marginal aberration of the optical lens can be corrected, the imaging pixels of the optical lens can be improved, and the imaging quality of the optical lens can be improved. That is, the lens group formed by the first lens, the second lens and the third lens has negative focal power as a whole, which is beneficial to the large-angle light beam to be emitted into the optical lens and realizes the design requirement of wide view of the optical lens. The fourth lens has positive focal power, is favorable for converging light in a further step, and reduces the deviation of the incidence angle and the emergence angle of the light of the optical lens in different view fields. The fifth lens element has positive refractive power, and the object-side surface and the image-side surface of the fifth lens element are convex at a paraxial region thereof, while the sixth lens element has negative refractive power, and the object-side surface and the image-side surface of the sixth lens element are concave at a paraxial region thereof, so that the fifth lens element and the sixth lens element cooperate with each other to facilitate mutual aberration correction and to alleviate astigmatism caused by light passing through the first lens element, the second lens element, the third lens element and the fourth lens element. The seventh lens has positive focal power, and the object side surface and the image side surface of the seventh lens are convex at the paraxial region, so that the influence of field curvature generated by the optical lens on the resolution is corrected. Therefore, the optical power and the surface shape of each lens are reasonably configured, so that the optical lens can meet the high-quality imaging effect and can realize the wide-view design requirement. In addition, the ratio of the effective focal length to the entrance pupil diameter of the optical lens is controlled within a certain range, so that the design requirement of a large aperture of the optical lens can be met, the quantity of light rays entering the optical lens is increased, the imaging brightness is improved, and the imaging quality of the optical lens is improved. That is, when the above relation is satisfied, the optical lens can achieve the design requirement of a large aperture, which is beneficial to improving the imaging quality of the optical lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: 3< imgh x 2/EPD <4; wherein Imgh is the radius of the maximum effective imaging circle of the optical lens.

Because the entrance pupil diameter of the optical lens can influence the quantity of light entering the optical lens, and the imaging quality of the optical lens is influenced, when the relation is satisfied, the optical lens can satisfy the requirement of sufficient image plane brightness of the marginal field of view by controlling the entrance pupil diameter of the optical lens on the basis of satisfying large image plane and high-quality imaging. When the above relation is not satisfied, the entrance pupil diameter of the optical lens is smaller, which is not beneficial to the design requirement of the large aperture of the optical lens and the improvement of the image plane brightness of the optical lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: 27mm < f1 x f2/f <33mm; wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

When the relation is satisfied, the focal power of the first lens and the second lens is proper, so that the light rays with large angles can be injected into the optical lens, the field of view range of the optical lens is enlarged, and the design requirement of wide view is realized. When f1 f2/f is more than or equal to 33mm, the focal power of the first lens and the second lens is insufficient, and large-angle light is difficult to enter the optical lens, so that the field of view range of the optical lens is not enlarged. When f1 f2/f is less than or equal to 27mm, the focal power of the first lens and the second lens is overlarge, so that stronger astigmatism and chromatic aberration are easy to generate, and high-resolution imaging of the optical lens is not facilitated.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: -15.4< f13/f47< -5.4; wherein f13 is a combined focal length of the first lens, the second lens, and the third lens, and f47 is a combined focal length of the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

When the relation is satisfied, the whole lens group formed by the first lens, the second lens and the third lens has negative focal power, so that the large-angle light beam is favorably emitted into the optical lens, the requirement of wide angle of the optical lens is met, and the brightness of the image surface of the optical lens is improved; the lens group formed by the fourth lens, the fifth lens, the sixth lens and the seventh lens has positive focal power, so that on one hand, the height of light rays emitted out of the optical lens can be controlled, the aberration of the optical lens and the outer diameter of each lens of the optical lens can be reduced, and on the other hand, the influence of field curvature generated by the first lens, the second lens and the third lens on the resolution can be corrected.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: 3.5< f3/CT3<5; wherein f3 is a focal length of the third lens, and CT3 is a thickness of the third lens on the optical axis.

Since the first lens and the second lens both have negative focal power, the third lens with positive focal power is beneficial to correcting the marginal aberration and improving the imaging resolution of the optical lens. The ratio of the focal length of the third lens to the thickness of the third lens is limited within a certain range, so that the thickness tolerance sensitivity of the third lens is reduced, the processing technology difficulty of the third lens is reduced, the assembly qualification rate of the optical lens is improved, and the production cost is further reduced. When the relation is satisfied, the thickness of the third lens is proper, so that the thickness tolerance sensitivity of the third lens is reduced, the processing difficulty of the third lens is reduced, the assembly qualification rate of the optical lens is improved, and the production cost is further reduced. When f3/CT3 is more than or equal to 5, the thickness of the third lens is too small on the premise of meeting the optical performance of the optical lens, so that the processing of the third lens is not facilitated, and the thickness tolerance sensitivity of the third lens is high; when f3/CT3 is less than or equal to 3.5, the thickness of the third lens is overlarge on the premise of meeting the optical performance of the optical lens, which is not beneficial to the design requirements of miniaturization and light weight of the optical lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: -5.5< f 56/(CT 5-CT 6) < -4; wherein f56 is a combined focal length of the fifth lens and the sixth lens, CT5 is a thickness of the fifth lens on the optical axis, and CT6 is a thickness of the sixth lens on the optical axis.

The fifth lens and the sixth lens are glued to form a glued lens, and as the fifth lens has positive focal power and the sixth lens has negative focal power, the gluing of the fifth lens and the sixth lens is favorable for correcting aberration mutually, and the purposes of eliminating aberration and correcting astigmatism caused by light passing through the first lens, the second lens, the third lens and the fourth lens are achieved. When the above relation is satisfied, the thickness difference between the fifth lens and the sixth lens is not large, which is favorable for the bonding of the fifth lens and the sixth lens; in addition, when the above relation is satisfied, the combined focal length of the fifth lens and the sixth lens is suitable, which is beneficial to improving the imaging quality of the optical lens. When f 56/(CT 5-CT 6) is more than or equal to-4, the combined focal length of the fifth lens and the sixth lens is overlarge, which is not beneficial to improving the imaging quality of the optical lens; when f 56/(CT 5-CT 6) is less than or equal to-5.5, the thickness difference between the fifth lens and the sixth lens is too large, which is unfavorable for the gluing between the fifth lens and the sixth lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: 2.5< Rs7/CT4<4; wherein Rs7 is a radius of curvature of the object side surface of the fourth lens element at the optical axis, and CT4 is a thickness of the fourth lens element on the optical axis.

The smooth surface of the lens can reduce the deviation of the incident angle and the emergent angle of light rays with different fields of view, and is favorable for reducing the sensitivity of the optical lens, so that when the relation is satisfied, the thickness of the fourth lens is reasonable, the difficulty in processing the fourth lens can be reduced, the smooth surface of the fourth lens is favorable, the thickness tolerance sensitivity of the optical lens is further reduced, and the qualification rate of the optical lens is improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present application, the optical lens further includes a diaphragm, and the optical lens satisfies the following relation: 2< TTL/DOS <2.5; wherein 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, and DOS is the distance between the object side surface of the first lens and the diaphragm on the optical axis.

When the relation is satisfied, the compact and miniaturized design of the optical lens is facilitated. When TTL/DOS is more than or equal to 2.5, the total length of the optical lens is too long, which is not beneficial to the miniaturization design of the optical lens; when TTL/DOS is less than or equal to 2, large-angle light is difficult to be injected into the optical lens, so that the imaging range of the optical lens is reduced, and the wide-angle design of the optical lens is not facilitated.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes an image sensor and the optical lens according to the first aspect, and the image sensor is disposed on an image side of the optical lens. The camera module with the optical lens of the first aspect not only can meet the requirements of large aperture and wide view of the camera module, but also can improve the imaging quality of the camera module.

In a third aspect, the present invention discloses an electronic device, which includes a housing and an image capturing module set according to the second aspect, where the image capturing module set is disposed in the housing. The electronic equipment with the camera module can meet the requirements of large aperture and wide view of the electronic equipment and can improve the imaging quality of the electronic equipment.

In a fourth aspect, the invention discloses an automobile, which comprises the camera module set in the second aspect. The automobile with the camera module can meet the requirements of large aperture and wide view of an automobile-mounted camera, and can improve the imaging quality of the automobile-mounted camera.

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

according to the optical lens, the camera module and the electronic equipment provided by the embodiment of the invention, the first lens and the second lens with negative focal power are adopted, and the image side surface of the second lens is convex at the position of the paraxial region, so that the first lens and the second lens can be favorable for converging light rays injected into the optical lens. The third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex at the paraxial region, so that the edge aberration of the optical lens can be corrected, the imaging pixels of the optical lens can be improved, and the imaging quality of the optical lens can be improved. That is, the lens group formed by the first lens, the second lens and the third lens has negative focal power as a whole, which is beneficial to the incidence of large-angle light beams and realizes the design requirement of wide view of the optical lens. The fourth lens has positive focal power, is favorable for converging light in a further step, and reduces the deviation of the incidence angle and the emergence angle of the light of the optical lens in different view fields. The fifth lens element has positive refractive power, and the object-side surface and the image-side surface of the fifth lens element are convex at a paraxial region thereof, while the sixth lens element has negative refractive power, and the object-side surface and the image-side surface of the sixth lens element are concave at a paraxial region thereof, so that the interaction of the fifth lens element and the sixth lens element is beneficial to correcting aberration and alleviating astigmatism generated by light rays passing through the first lens element, the second lens element, the third lens element and the fourth lens element. The seventh lens has positive focal power, and the object side surface and the image side surface of the seventh lens are convex at the paraxial region, so that the influence of field curvature generated by the optical lens on the resolution is corrected. Therefore, the optical power and the surface shape of each lens are reasonably configured, so that the optical lens can meet the high-quality imaging effect and can realize the wide-view design requirement. In addition, the invention also enables the optical lens to meet the following relation: 1.1.ltoreq.f/EPD.ltoreq.1.6, by controlling the ratio of the effective focal length and the entrance pupil diameter of the optical lens within a certain range, the design requirement of the large aperture of the optical lens is realized, the quantity of light entering the optical lens is increased, the imaging brightness is improved, and the imaging quality of the optical lens is improved.

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 diagram of an optical lens according to an embodiment of the present invention;

FIG. 2 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to an embodiment of the present invention;

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

FIG. 4 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a second embodiment of the present invention;

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

FIG. 6 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a third embodiment of the present invention;

FIG. 7 is a schematic diagram of an optical lens according to a fourth embodiment of the present invention;

FIG. 8 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a fourth embodiment of the present invention;

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

FIG. 10 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to the fifth embodiment of the present invention;

FIG. 11 is a schematic diagram of an optical lens according to a sixth embodiment of the present invention;

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

FIG. 13 is a schematic view of a camera module according to the present disclosure;

FIG. 14 is a schematic diagram of the structure of an electronic device of the present disclosure;

fig. 15 is a schematic view of the structure of the automobile disclosed in the present invention.

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 invention, 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, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in sequence from the object side of the first lens L1 and finally forms an image on the imaging surface 101 of the optical lens 100. Wherein the first lens L1 has negative power, the second lens L2 has negative power, the third lens L3 has positive power, the fourth lens L4 has positive power, the fifth lens L5 has positive power, the sixth lens L6 has negative power, and the seventh lens L7 has positive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex or concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex or concave at a paraxial region O, and the image-side surface 22 of the second lens element L2 is convex at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at a paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex or concave at a paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex at a paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at the paraxial region O; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex at a paraxial region 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 and the seventh lens L7 may be glass lenses, so that the temperature sensitivity of the optical lens 100 may be reduced while having a good optical effect.

Alternatively, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 may be plastic, so that the optical lens 100 is light and thin and easy to process the complex lens surface.

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 or aspherical lenses. It is understood that one aspherical lens can achieve the effect of correcting phase differences of a plurality of spherical lenses. That is, the use of the aspherical lens can correct the phase difference and reduce the number of lenses used, which is advantageous in meeting the miniaturization requirement of the optical lens 100 and improving the imaging quality. The specific number of the spherical lenses and the aspherical lenses may be set according to practical situations, for example, the first lens L1 is a spherical lens, the remaining lenses are aspherical lenses, or the first lens L1 and the third lens L3 are spherical lenses, and the remaining lenses are aspherical lenses.

In some embodiments, the fifth lens L5 and the sixth lens L6 are cemented. It can be appreciated that the fifth lens L5 and the sixth lens L6 are bonded to each other to eliminate aberration and correct astigmatism caused by the refraction of the light rays through the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4.

In some embodiments, the optical lens 100 further includes a stop 102, which may be an aperture stop 102 and/or a field stop 102, which may be disposed between the image side 32 of the third lens L3 and the object side 41 of the fourth lens L4 of the optical lens 100. It will be appreciated that in other embodiments, the diaphragm 102 may be disposed between other lenses, for example, between the image side 12 of the first lens element L1 and the object side 21 of the second lens element L2, and the arrangement may be specifically adjusted according to practical situations, and the embodiment is not limited thereto.

In some embodiments, the optical lens 100 further includes a filter 10, and the filter 10 is disposed between the seventh lens L7 and the imaging surface 101 of the optical lens 100. Optionally, the optical filter 10 may be an infrared optical filter, so that infrared light can be filtered, and the imaging quality is improved, so that the imaging better meets the visual experience of human eyes. It is to be understood that the optical filter 10 may be made of an optical glass coating or may be made of a colored glass, and may be specifically selected according to practical needs, and the embodiment is not limited specifically.

In some embodiments, the optical lens 100 satisfies the following relationship: f/EPD is not less than 1.1 and not more than 1.6; where f is the effective focal length of the optical lens 100 and EPD is the entrance pupil diameter of the optical lens 100. By controlling the ratio of the effective focal length and the entrance pupil diameter of the optical lens 100 within a certain range, the design requirement of a large aperture of the optical lens 100 can be realized, so that the quantity of light rays entering the optical lens 100 is increased, the brightness of imaging is improved, and the imaging quality of the optical lens 100 is improved. That is, when the above relation is satisfied, the optical lens 100 can achieve the design requirement of a large aperture, which is beneficial to improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 3< imgh x 2/EPD <4; where Imgh is the radius of the maximum effective imaging circle of the optical lens 100. Since the entrance pupil diameter of the optical lens 100 affects the amount of light entering the optical lens 100, the imaging quality of the optical lens 100 is affected. Therefore, when the above relation is satisfied, the optical lens 100 can satisfy the image plane brightness requirement of sufficient fringe field of view by controlling the entrance pupil diameter of the optical lens 100 on the basis of satisfying the large image plane and high quality imaging. When the above relation is not satisfied, the entrance pupil diameter of the optical lens 100 is smaller, which is not beneficial to the design requirement of the large aperture of the optical lens 100 and the improvement of the image plane brightness of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 27mm < f1 x f2/f <33mm; wherein f1 is the focal length of the first lens L1, and f2 is the focal length of the second lens L2. When the above relation is satisfied, the optical powers of the first lens L1 and the second lens L2 are appropriate, so that the light beam with a large angle can be injected into the optical lens 100, which is beneficial to expanding the field of view of the optical lens 100 and realizing the design requirement of wide view. When f1 f2/f is greater than or equal to 33mm, the optical power of the first lens L1 and the second lens L2 is insufficient, so that light rays with large angles are difficult to enter the optical lens 100, and the field of view of the optical lens 100 is not widened. When f1×f2/f is less than or equal to 27mm, the optical powers of the first lens L1 and the second lens L2 are too large, so that stronger astigmatism and chromatic aberration are easily generated, which is not beneficial to the high-resolution imaging characteristics of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: -15.4< f13/f47< -5.4; wherein f13 is a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f47 is a combined focal length of the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7. When the above relation is satisfied, the lens group formed by the first lens L1, the second lens L2 and the third lens L3 has negative focal power, which is beneficial to the large-angle light beam to be incident into the optical lens 100, so as to realize the requirement of wide angle of the optical lens 100 and improve the brightness of the image surface of the optical lens 100; the lens group formed by the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 has positive focal power, so that on one hand, the height of light rays emitted out of the optical lens 100 can be controlled, the aberration of the optical lens 100 and the outer diameter of each lens of the optical lens 100 can be reduced, and on the other hand, the influence of field curvature generated by the first lens L1, the second lens L2 and the third lens L3 on the resolution can be corrected.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.5< f3/CT3<5; wherein f3 is the focal length of the third lens L3, and CT3 is the thickness of the third lens L3 on the optical axis O. Since the first lens L1 and the second lens L2 have negative focal power, providing a third lens L3 having positive focal power is beneficial to correcting the aberrations at the edges and improving the imaging resolution of the optical lens 100. The ratio of the focal length of the third lens L3 to the thickness of the third lens L3 is limited within a certain range, so that the thickness tolerance sensitivity of the third lens L3 is reduced, the processing difficulty of the third lens L3 is reduced, the assembly qualification rate of the optical lens 100 is improved, and the production cost is further reduced. When the above relation is satisfied, the thickness of the third lens L3 is appropriate, which is favorable for reducing the thickness tolerance sensitivity of the third lens L3, reducing the difficulty of the processing technology of the third lens L3, improving the assembly qualification rate of the optical lens 100, and further reducing the production cost. When f3/CT3 is more than or equal to 5, the thickness of the third lens L3 is too small on the premise of meeting the optical performance of the optical lens 100, so that the processing of the third lens L3 is not facilitated, and the thickness tolerance sensitivity of the third lens L3 is high; when f3/CT3 is less than or equal to 3.5, the thickness of the third lens L3 is too large on the premise that the optical performance of the optical lens 100 is met, which is not beneficial to the design requirements of miniaturization and light weight of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: -5.5< f 56/(CT 5-CT 6) < -4; wherein f56 is the combined focal length of the fifth lens element L5 and the sixth lens element L6, CT5 is the thickness of the fifth lens element L5 on the optical axis O, and CT6 is the thickness of the sixth lens element L6 on the optical axis O. The fifth lens and the sixth lens are glued to form a glued lens, and since the fifth lens L5 has positive focal power and the sixth lens L6 has negative focal power, the gluing of the fifth lens L5 and the sixth lens L6 is beneficial to correcting aberration, so that the purposes of eliminating aberration and correcting astigmatism caused by light passing through the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are achieved. When the above relation is satisfied, the thickness difference between the fifth lens L5 and the sixth lens L6 is not large, which is advantageous for the gluing of the fifth lens L5 and the sixth lens L6; in addition, when the above relation is satisfied, the combined focal length of the fifth lens L5 and the sixth lens L6 is suitable, which is beneficial to improving the imaging quality of the optical lens 100. When f 56/(CT 5-CT 6) is more than or equal to-4, the combined focal length of the fifth lens L5 and the sixth lens L6 is too large, which is not beneficial to improving the imaging quality of the optical lens 100; when f 56/(CT 5-CT 6). Ltoreq.5.5, the difference in thickness between the fifth lens L5 and the sixth lens L6 is too large, which is unfavorable for the adhesion between the fifth lens L5 and the sixth lens L6.

In some embodiments, the optical lens 100 satisfies the following relationship: 2.5< Rs7/CT4<4; wherein Rs7 is a radius of curvature of the object side surface 41 of the fourth lens element L4 at the optical axis O, and CT4 is a thickness of the fourth lens element L4 on the optical axis O. Because the surface shape of the lens is smooth, the deviation of the incident angle and the emergent angle of the light rays with different fields of view can be reduced, the sensitivity of the optical lens 100 is reduced, therefore, when the relational expression is satisfied, the thickness of the fourth lens L4 is reasonable, the difficulty in processing the fourth lens L4 can be reduced, the surface shape of the fourth lens L4 is smoother, the thickness tolerance sensitivity of the optical lens 100 is reduced, and the qualification rate of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< TTL/DOS <2.5; wherein TTL is the distance between the object side surface 11 of the first lens element L1 and the imaging surface 101 of the optical lens 100 on the optical axis O, and DOS is the distance between the object side surface 11 of the first lens element L1 and the stop 102 on the optical axis O. When the above relation is satisfied, the compact and miniaturized design of the optical lens 100 is facilitated. When TTL/DOS is more than or equal to 2.5, the total length of the optical lens 100 is too long, which is not beneficial to the miniaturization design of the optical lens 100; when TTL/DOS is less than or equal to 2, large-angle light is difficult to be injected into the optical lens 100, so that the imaging range of the optical lens 100 is reduced, and the wide-angle design of the optical lens 100 is not facilitated.

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

Example 1

As shown in fig. 1, a schematic structural diagram of an optical lens 100 according to an embodiment of the present invention is shown, and the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter 10 sequentially disposed from an object side to an image side along an optical axis O.

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

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

Specifically, taking as an example the effective focal length f=4.01 mm of the optical lens 100, the aperture value fno=1.6 of the optical lens 100, the field angle fov=145° of the optical lens 100, the total length ttl=30.000 mm of the optical lens 100, the radius imgh=4.801 mm of the maximum effective imaging circle of the optical lens 100, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, i.e., the surface numbers 1 and 2 correspond to the object side surface and the image side surface of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis O. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The values of the aperture 102 in the "thickness" parameter row are distances between the aperture 102 and the object side surface of the fourth lens element L4 on the optical axis O. It is understood that the units of the radius, thickness and focal length of Y in table 1 are all mm, and the refractive index and abbe number in table 1 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the first embodiment, the object side surfaces and the image side surfaces of the second lens element L2, the fourth lens element L4 and the seventh lens element L7 are aspheric, and the object side surfaces and the image side surfaces of the other lens elements are spherical. The profile x of each aspherical lens can be defined using, but not limited to, the following aspherical formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis O direction; c is the curvature of the aspherical surface at the optical axis O, c=1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conic coefficient; ai is the correction coefficient of the 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 mirrors in example one are given in Table 2 below.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows the optical spherical aberration diagrams of the optical lens 100 of the first embodiment at wavelengths of 455nm, 510nm, 555nm, 610nm and 660 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 555nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatism curves represent the meridional imaging plane 101 curvature T and the sagittal imaging plane 101 curvature S, and it can be seen from fig. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

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

Example two

As shown in fig. 3, the optical lens 100 according to the second embodiment of the present invention includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter 10 sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length f=4.01 mm of the optical lens 100, the aperture value fno=1.6 of the optical lens 100, the field angle fov=146° of the optical lens 100, the total length ttl= 29.989mm of the optical lens 100, and the radius imgh= 4.815mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 3, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 3 are all mm, and the refractive index and abbe number in table 3 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the second embodiment, the object side surfaces and the image side surfaces of the second lens element L2, the fourth lens element L4 and the seventh lens element L7 are aspheric, and the object side surfaces and the image side surfaces of the other lens elements are spherical. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example two are given in Table 4 below.

TABLE 3 Table 3

TABLE 4 Table 4

Referring to fig. 4, as can be seen from the graph of (a) optical spherical aberration in fig. 4, the graph of (B) optical spherical aberration in fig. 4, and the graph of (C) distortion in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), reference may be made to the descriptions in the first embodiment regarding fig. 2 (a), fig. 2 (B), and fig. 2 (C), and the descriptions are omitted here.

Example III

As shown in fig. 5, a schematic structural diagram of an optical lens 100 according to a third embodiment of the present invention, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter 10 sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length f=4.01 mm of the optical lens 100, the aperture value fno=1.6 of the optical lens 100, the field angle fov=145 of the optical lens 100, the total length ttl= 29.857mm of the optical lens 100, and the radius imgh= 4.774mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 5, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 5 are all mm, and the refractive index and abbe number in table 5 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the third embodiment, the object side surfaces and the image side surfaces of the second lens element L2, the fourth lens element L4 and the seventh lens element L7 are aspheric, and the object side surfaces and the image side surfaces of the other lens elements are spherical. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example three are given in Table 6 below.

TABLE 5

TABLE 6

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

Example IV

As shown in fig. 7, a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present invention is shown, and the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter 10 sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length f=4.01 mm of the optical lens 100, the aperture value fno=1.6 of the optical lens 100, the field angle fov=145 of the optical lens 100, the total length ttl= 30.003mm of the optical lens 100, and the radius imgh= 4.769mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 7, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 7 are all mm, and the refractive index and abbe number in table 7 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the fourth embodiment, the object side surfaces and the image side surfaces of the second lens element L2, the fourth lens element L4 and the seventh lens element L7 are aspheric, and the object side surfaces and the image side surfaces of the other lens elements are spherical. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example four are given in Table 8 below.

TABLE 7

TABLE 8

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

Example five

As shown in fig. 9, a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present invention is shown, and the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter 10 sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length f=4.01 mm of the optical lens 100, the aperture value fno=1.6 of the optical lens 100, the field angle fov=145 of the optical lens 100, the total length ttl=30.000 mm of the optical lens 100, and the radius imgh= 4.769mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 9, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 9 are all mm, and the refractive index and abbe number in table 9 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the fifth embodiment, the object side surfaces and the image side surfaces of the second lens element L2, the fourth lens element L4 and the seventh lens element L7 are aspheric, and the object side surfaces and the image side surfaces of the other lens elements are spherical. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The following table 10 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 that can be used for each of the aspherical mirrors in embodiment five.

TABLE 9

Table 10

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

Example six

As shown in fig. 11, a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present invention is shown, and the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter 10 sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length f=4.01 mm of the optical lens 100, the aperture value fno=1.6 of the optical lens 100, the field angle fov=145 of the optical lens 100, the total length ttl= 30.0500mm of the optical lens 100, and the radius imgh=4.758 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 11, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness and focal length of Y in table 11 are all mm, and the refractive index and abbe number in table 11 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the sixth embodiment, the object-side surfaces and the image-side surfaces of the second lens element L2, the fourth lens element L4 and the seventh lens element L7 are aspheric, and the object-side surfaces and the image-side surfaces of the remaining lens elements are spherical. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. 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 of the aspherical mirrors in the sixth five embodiments.

TABLE 11

Table 12

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

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

TABLE 13

Relation/embodiment	Example 1	Example two	Example III	Example IV	Example five	Example six
							1.1≤f/EPD≤1.6	1.597	1.598	1.598	1.599	1.599	1.598
3<Imgh*2/EPD<4	3.825	3.837	3.804	3.803	3.802	3.793
							27mm<f1*f2/f<33mm	30.916mm	27.391mm	31.753mm	32.526mm	32.524mm	32.850mm
-15.4<f13/f47<-5.4	-5.503	-8.880	-5.444	-6.944	-6.935	-15.285
							3.5<f3/CT3<5	4.531	3.877	4.067	3.770	3.771	3.942
-5.5<f56/(CT5-CT6)<-4	-5.142	-4.487	-4.658	-4.761	-4.762	-5.094
							2.5<Rs7/CT4<4	2.943	2.987	3.220	3.354	3.353	3.691
2<TTL/DOS<2.5	2.096	2.102	2.126	2.131	2.131	2.126

In a second aspect, referring to fig. 13, the present invention further discloses an image capturing module 200, where the image capturing module 200 includes an image sensor 201 and the optical lens 100 according to any one of the first to sixth embodiments, the image sensor 201 is disposed on an image side of the optical lens 100, and the image sensor 201 is configured to convert an optical signal corresponding to a subject into an image signal, which is not described herein. It can be appreciated that the image capturing module 200 with the optical lens 100 not only can realize the design requirements of large aperture and wide view, but also can improve the imaging quality of the image capturing module 200.

In a third aspect, referring to fig. 14, the present invention further discloses an electronic device 300, where the electronic device 300 includes a housing and the camera module 200, and the camera module 200 is disposed on the housing, so that not only the overall large aperture and wide-view design requirements of the electronic device 300 can be met, but also the imaging quality of the electronic device 300 can be improved.

In a fourth aspect, referring to fig. 15, the present invention further discloses an automobile 400, where the automobile 400 includes an automobile body and the camera module 200 as described above, and the camera module 200 is disposed on the automobile body, so that not only the overall large aperture and wide view design requirements of the automobile 400 on-board camera can be met, but also the imaging quality of the automobile 400 on-board camera can be improved.

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 is characterized in that seven lenses with optical power are provided, and the seven lenses comprise 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 first lens element has negative refractive power, wherein an object-side surface of the first lens element is convex at a paraxial region thereof, and an image-side surface of the first lens element is concave at a paraxial region thereof;

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

The fourth lens element has positive refractive power, and an object-side surface and an image-side surface of the fourth lens element are convex at a paraxial region;

the optical lens further comprises a diaphragm, and the diaphragm is positioned between the third lens and the fourth lens;

the optical lens satisfies the following relation:

1.1≤f/EPD≤1.6；-15.4<f13/f47<-5.4；2<TTL/DOS<2.5；

wherein f is an effective focal length of the optical lens, EPD is an entrance pupil diameter of the optical lens, f113 is a combined focal length of the first lens, the second lens and the third lens, f47 is a combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens, TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, DOS is a distance from the object side surface of the first lens to the diaphragm on the optical axis.

2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 3< imgh x 2/EPD <4;

wherein Imgh is the radius of the maximum effective imaging circle of the optical lens.

3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 27mm < f1 x f2/f <33mm;

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

4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 3.5< f3/CT3<5;

wherein f3 is a focal length of the third lens, and CT3 is a thickness of the third lens on the optical axis.

5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: -5.5< f 56/(CT 5-CT 6) < -4;

wherein f56 is a combined focal length of the fifth lens and the sixth lens, CT5 is a thickness of the fifth lens on the optical axis, and CT6 is a thickness of the sixth lens on the optical axis.

6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 2.5< Rs7/CT4<4;

Wherein Rs7 is a radius of curvature of the object side surface of the fourth lens element at the optical axis, and CT4 is a thickness of the fourth lens element on the optical axis.

7. An image capturing module, comprising an image sensor and the optical lens according to any one of claims 1 to 6, wherein the image sensor is disposed on an image side of the optical lens.

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