CN212543902U

CN212543902U - Optical lens, camera module and electronic equipment

Info

Publication number: CN212543902U
Application number: CN202022129329.1U
Authority: CN
Inventors: 谭怡翔; 刘秀; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-02-12
Anticipated expiration: 2030-09-24

Abstract

An optical lens, a camera module and an electronic device, the optical lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element sequentially disposed along an optical axis from an object side to an image side, the first lens element has refractive power, the second lens element has refractive power, the third lens element has refractive power, the fourth lens element has positive refractive power, an object side surface and an image side surface of the fourth lens element are convex at a paraxial region, the fifth lens element has negative refractive power, the sixth lens element has refractive power, the seventh lens element has refractive power, the eighth lens element has refractive power, the object side surface and the image side surface of the eighth lens element are convex and concave at a paraxial region, the optical lens satisfies the following relation: almax is less than or equal to 30 deg. The embodiment of the utility model provides an optical lens, module and electronic equipment make a video recording adopt eight formula lens to make the injecing to the power of refracting of each lens, face type, thereby make optical lens satisfy miniaturized designing requirement, can reduce the processing of lens, the shaping degree of difficulty.

Description

Optical lens, camera module and electronic equipment

Technical Field

The utility model relates to an optical imaging technology field especially relates to an optical lens, module and electronic equipment make a video recording.

Background

In recent years, with the progress of the scientific and technological industry, imaging technology is continuously developed, and optical lenses for optical imaging are widely applied to electronic devices such as smart phones, tablet computers, video cameras and the like. Taking a smart phone as an example, in order to improve the shooting effect, it has become the mainstream of the smart phone market to mount one, two, or even three or more cameras with different orientation functions in the smart phone. However, with the demand for a lightweight design of a smartphone, a demand is also made for the volume of a mounted camera, and miniaturization of the camera is also required, which increases the difficulty in processing and molding each lens of the camera, and also challenges the imaging quality of the miniaturized camera.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model discloses optical lens, module and electronic equipment make a video recording can reduce processing, the shaping degree of difficulty of each lens of camera when realizing optical lens's miniaturized design, improves the formation of image quality of the camera after the miniaturized design simultaneously.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are arranged in order from an object side to an image side along an optical axis;

the first lens element with refractive power;

the second lens element with refractive power;

the third lens element with refractive power;

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

the fifth lens element with negative refractive power;

the sixth lens element with refractive power;

the seventh lens element with refractive power;

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

the optical lens satisfies the following relation:

almax is less than or equal to 30deg, and is the maximum value of an included angle formed by the intersection of each tangent plane in the effective diameter of the object side surface and the image side surface of any lens and a plane perpendicular to the optical axis.

In the optical lens provided by this embodiment, eight-piece lenses are adopted, and the refractive power and the surface type of the eight-piece lenses are designed, so that the eight-piece optical lens can meet the requirement of miniaturization design, and the processing and molding difficulty of the lenses can be reduced. Meanwhile, through reasonable refractive power configuration, the capturing capability of the optical lens on low-frequency details can be improved, and the design requirement of high image quality is met. In addition, through the reasonable configuration of the surface type of the eight-piece lens, the value range of the maximum value of the included angle formed by the intersection of the tangent plane at each position in the effective diameter of the object side surface and the image side surface of any lens and the plane perpendicular to the optical axis is limited, so that the reasonable surface type bending degree setting of the eight-piece lens can be realized, the surface type complexity of the lens of the eight-piece lens is low, the increase of field curvature and distortion in the T direction is restrained to a certain degree, the processing and forming difficulty of the lens is favorably reduced, and the integral imaging image quality of the optical lens is favorably improved.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: FOV is greater than 90deg, FNO is less than or equal to 2.3;

wherein, FOV is the maximum field angle of the optical lens, and FNO is the f-number of the optical lens.

When satisfying above-mentioned relational expression, on the one hand, this optical lens can realize getting for instance at super wide angle to promote and find a view the area in order to obtain more image information, on the other hand, can also guarantee good luminous flux, and then improve optical lens's imaging quality.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 51deg/mm > FOV/f >29 deg/mm;

wherein FOV is the maximum field angle of the optical lens, and f is the effective focal length of the optical lens.

When the relation is satisfied, the maximum field angle of the optical lens is large, the viewing area of a picture can be effectively increased, and meanwhile, when the effective focal length f is reduced, the optical lens can contain more image capturing areas and have certain macro-distance capability.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: SD1/ImgH < 0.43;

wherein SD1 is an effective aperture of the object-side surface of the first lens element, and ImgH is half of the image height corresponding to the maximum field angle of the optical lens.

When the relation is satisfied, the aperture of the object side surface of the first lens is relatively small, so that the characteristic of a small head is realized while the ultra-wide angle is satisfied, the cavity area required by the ultra-wide angle lens for the electronic equipment is effectively reduced, the cost and the processing difficulty are reduced, and the yield is further improved.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: SD1/AT12< 34;

wherein SD1 is an effective aperture of an object side surface of the first lens, and AT12 is a distance on the optical axis from an image side surface of the first lens to an object side surface of the second lens.

Since SD1 represents the size of the head (i.e., the first lens) of the optical lens, it affects the overall arrangement, assembly yield, etc. of the optical lens. Therefore, by defining the above relational expression, SD1 is effectively compressed, the size of the head of the optical lens can be reduced, and the width of the lens group of the optical lens in the direction perpendicular to the optical axis can be reduced. Furthermore, the size of the whole optical lens can be compressed to a greater extent by matching with the reduction of AT12, the structural compactness of the optical lens is improved, and the ghost risk is reduced. In addition, the structural arrangement difficulty of the optical lens can be reduced, and the assembly forming yield of the optical lens is improved.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.64 < (| R72| + | R82|)/f < 0.94.

Wherein R72 is a radius of curvature of the image-side surface of the seventh lens element at the optical axis, R82 is a radius of curvature of the image-side surface of the eighth lens element at the optical axis, and f is an effective focal length of the optical lens assembly.

The combined structure of the seventh lens and the eighth lens can counteract most of the distortion and coma generated by the front lens (namely the lenses before the seventh lens and the eighth lens). Meanwhile, the reasonable curvature radius can avoid the introduction of larger spherical aberration and vertical axis chromatic aberration into the lens, thereby being beneficial to the reasonable distribution of the primary aberration on each lens and reducing the tolerance sensitivity of the optical lens.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 11 < (| f4| + | f5|)/f < 33;

wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical lens.

By reasonably configuring the ratio of the sizes of the fourth lens and the fifth lens to the effective focal length of the optical lens, large spherical aberration generated by the lens group can be avoided, and the integral resolving power of the optical lens is improved; meanwhile, the surface type complexity of the sixth lens, the seventh lens and the eighth lens is reduced, and the production yield of the optical lens is improved.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.9 < (| CT6| + | CT7| + | CT8|)/BF < 2.2;

wherein CT6 is a central thickness of the sixth lens element on the optical axis, CT7 is a central thickness of the seventh lens element on the optical axis, CT8 is a central thickness of the eighth lens element on the optical axis, and BF is a minimum distance between the sixth lens element and an image plane of the optical lens element on the optical axis. When the relational expression is satisfied, the optical lens and the photosensitive chip can be ensured to have enough matching space, so that the improvement of the assembly yield of the optical lens is facilitated. In addition, by reasonably arranging the CT6, the CT7 and the CT8, the optical length of the optical lens can be reduced, symmetry is formed, optical distortion is reduced, and imaging quality is improved.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0 < | R81|/| f8| < 0.9;

wherein R81 is a radius of curvature of an object-side surface of the eighth lens at the optical axis, and f8 is an effective focal length of the eighth lens.

The reasonable focal power and the curvature radius of the eighth lens are set, so that the surface type complexity of the eighth lens is low, the increase of field curvature and distortion in the T direction is inhibited to a certain extent, the forming difficulty is reduced, and the integral image quality of the optical lens is improved.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2< CT45/ET45<1, where CT45 is a distance between the fourth lens and the fifth lens on the optical axis, and ET5 is a thickness of an effective diameter region of the fifth lens.

When the above relation is satisfied, the fourth lens element and the fifth lens element form a certain matching shape, the fifth lens element has negative refractive power, the fourth lens element has refractive power, and the fourth lens element has good correction effect on chromatic aberration and good correction effect on spherical aberration under good matching, so that the optical lens has good resolution. In addition, the reduction of the relevant sizes of the fourth lens and the fifth lens also provides convenience for improving the overall structural compactness and compressing the optical length of the optical lens.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens further includes a diaphragm and an ir filter, the diaphragm is disposed between the third lens and the fourth lens, and the ir filter is disposed between the image side of the seventh lens and the image side of the optical lens.

In the embodiment, the diaphragm is arranged between the third lens and the fourth lens, and the diaphragm is a middle diaphragm, so that the realization of the optical lens with a large field angle is possible, and the improvement of the imaging quality of the optical lens is facilitated. In addition, in order to ensure the imaging definition of the shot object on the image side, the infrared light in the light passing through the eighth lens can be effectively filtered through the infrared filter, so that the imaging definition of the shot object on the image side is ensured, and the imaging quality is improved.

In a second aspect, the present invention discloses a camera module, which comprises an image sensor and an optical lens according to the above first aspect, wherein the image sensor is disposed on the image side of the optical lens.

The camera module with the optical lens meets the requirement of miniaturization design, and can realize the telescopic shooting function and ensure the imaging quality.

A third aspect, the utility model also discloses an electronic equipment, electronic equipment include the casing and as above-mentioned second aspect the module of making a video recording, the module of making a video recording is located the casing. The electronic equipment with the camera module can effectively meet the requirement of miniaturization design, and can also realize the telescopic shooting function and ensure the imaging quality.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the embodiment of the utility model provides an optical lens, module and electronic equipment make a video recording, this optical lens adopt eight formula lens to design the power of refracting of each lens, face type, thereby make this eight formula optical lens can satisfy miniaturized design in, can also reduce processing, the shaping degree of difficulty of its lens. In addition, through reasonable refractive power configuration, the capturing capability of the optical lens to low-frequency details can be improved, and the design requirement of high image quality is met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

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

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

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

fig. 4 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 6 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 8 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 10 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 11 is a schematic structural diagram of the camera module disclosed in the present application;

fig. 12 is a schematic structural diagram of an electronic device disclosed in the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, the terms "mounting", "setting", "provided", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

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

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

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light enters the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in sequence from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 with negative or positive refractive power includes a first object-side surface 11 and a first image-side surface 12, and the second lens element L2 with positive or negative refractive power includes a second object-side surface 21 and a second image-side surface 22. The third lens element L3 with positive or negative refractive power includes a third object-side surface 31 and a third image-side surface 32. The fourth lens element L4 with positive refractive power includes a fourth object-side surface 41 and a fourth image-side surface 42. The fifth lens element L5 with negative refractive power includes a fifth object-side surface 51 and a fifth image-side surface 52. The sixth lens element L6 with positive or negative refractive power includes a sixth object-side surface 61 and a sixth image-side surface 62. The seventh lens element L7 with positive or negative refractive power includes a seventh object-side surface 71 and a seventh image-side surface 72. The eighth lens element L8 with positive or negative refractive power includes an eighth object-side surface 81 and an eighth image-side surface 82.

Further, the first object-side surface 11 is convex and concave at the paraxial region, and the first image-side surface 12 is concave or convex at the paraxial region. The second object-side surface 21 is convex or concave at a paraxial region, and the second image-side surface 22 is concave or convex at a paraxial region. The third object-side surface 31 is convex or concave at the paraxial region, the third image-side surface 32 is convex at the paraxial region, the fourth object-side surface 41 is convex at the paraxial region, and the fourth image-side surface L44 is convex at the paraxial region. The fifth object-side surface 51 is concave or convex at a paraxial region, and the fifth image-side surface 52 is concave or convex at a paraxial region. The sixth object-side surface 61 is concave or convex at the optical axis, and the sixth image-side surface 62 is convex or concave at the optical axis. The seventh object-side surface 71 is concave or convex at the optical axis, and the seventh image-side surface 72 is concave or convex at the optical axis. The eighth object-side surface 81 is convex at the paraxial region, and the eighth image-side surface 82 is concave at the paraxial region.

The first object-side surface 11 is convex and concave at a position near the circumference, and the first image-side surface 12 is concave or convex at the circumference. The second object-side surface 21 is concave at the circumference, and the second image-side surface 22 is convex or concave at the circumference. The third object-side surface 31 is convex or concave at the circumference, the third image-side surface 32 is convex or concave at the circumference, the fourth object-side surface 41 is convex at the circumference, and the fourth image-side surface 42 is convex at the circumference. The fifth object-side surface 51 is concave at the circumference and the fifth image-side surface 52 is convex or concave at the circumference. The sixth object-side surface 61 is concave at the circumference, and the sixth image-side surface 62 is concave or convex at the circumference. The seventh object side 71 is concave or convex at the circumference, and the seventh image side 72 is concave or convex at the circumference. The eighth object-side surface 81 is concave at the circumference, and the eighth image-side surface 82 is convex at 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, the seventh lens L7, and the eighth lens L8 may all be aspheric lenses. The aspheric lens has the characteristics that: the curvature of the lens varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration.

In an alternative embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may all be made of plastic, and the plastic lens can effectively reduce the weight of the optical lens 100 and reduce the production cost thereof.

In another alternative embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may all be made of glass, and the glass lens has low temperature sensitivity and can have good optical performance.

It is understood that, in the above eight lenses, the material of some lenses may be glass, and the material of other lenses may be plastic. The material settings of the eight lenses 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 stop 102, and the stop 102 may be an aperture stop 102 and/or a field stop 102, which may be disposed between the third lens L3 and the fourth lens L4. With the arrangement of the central diaphragm, the possibility of a large field angle of the optical lens 100 is provided. Illustratively, the stop 102 may be located between the third image-side surface 32 of the third lens L3 and the fourth object-side surface 41 of the fourth lens L4 to improve the imaging quality. It is understood that the stop may be disposed at other positions of the optical lens 100, for example, between the first lens L1 and the second lens L2, or between the second lens L2 and the third lens L3, and the like, which is not limited in this embodiment.

Optionally, in order to improve the imaging quality, the optical lens 100 further includes an infrared filter 90, and the infrared filter 90 is disposed between the eighth image-side surface 82 of the eighth lens L8 and the image side of the optical lens 100. By adopting the arrangement of the infrared filter 90, the infrared light passing through the eighth lens L8 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: almax is less than or equal to 30 deg; and Almax is the maximum value of an included angle formed by the intersection of each tangent plane in the effective diameter of the object side surface and the image side surface of any lens and a plane perpendicular to the optical axis. Alternatively, Almax can take on a value of 10deg, 20deg or 30deg, as long as it is less than 30 deg.

Through the reasonable configuration of the surface type of the eight-piece type lens, the value range of the maximum value of the included angle formed by the intersection of the tangent plane at each position in the effective diameter of the object side surface and the image side surface of any lens and the plane perpendicular to the optical axis is limited, so that the reasonable surface type bending degree setting of the eight-piece type lens can be realized, the surface type complexity of the lens of the eight-piece type lens is low, the increase of field curvature and distortion in the T direction is restrained to a certain degree, the processing and forming difficulty of the lens is favorably reduced, and the integral imaging image quality of the optical lens is favorably improved.

In some embodiments, the optical lens 100 satisfies the following relationship: FOV is greater than 90deg, FNO is less than or equal to 2.3; wherein, FOV is the maximum field angle of the optical lens, and FNO is the f-number of the optical lens. Alternatively, the FOV may take on values of 90.2deg, 101.34deg, 104.42 deg, 107.47deg, 110deg, 124deg, and so on. FNO can be selected from 2.1, 2.15, 2.2, 2.25, 2.3, etc.

In some embodiments, the optical lens 100 satisfies the following relationship: 51deg/mm > FOV/f >29 deg/mm; wherein FOV is the maximum field angle of the optical lens, and f is the effective focal length of the optical lens. Optionally, the FOV/f can be 29.19deg/mm, 39.88deg/mm, 42.88deg/mm, 47.34deg/mm, 50.6912deg/mm, etc. When the relation is satisfied, the optical lens can provide a viewing angle of over 110deg, and the viewing area of the picture can be effectively increased. When the maximum field angle FOV is larger, for example, 124deg is reached, the effective focal length f is reduced, so that the optical lens has a certain macro capability while accommodating more image capture area.

In some embodiments, the optical lens 100 satisfies the following relationship: SD1/ImgH < 0.43; wherein SD1 is an effective aperture of the object-side surface of the first lens element, and ImgH is half of the image height corresponding to the maximum field angle of the optical lens. Illustratively, SD1/ImgH may take on values of 0.36, 0.37, 0.41, 0.42, etc.

When the relational expression is satisfied, the caliber of the object side surface of the first lens is relatively small, so that the characteristic of a small head is realized while the super-wide angle is satisfied, the cavity area required by the super-optic angle lens for the electronic equipment is effectively reduced, the cost and the processing difficulty are reduced, and the yield is further improved.

In some embodiments, optical lens 100 satisfies the following relationship: SD1/AT12< 34; wherein SD1 is an effective aperture of an object side surface of the first lens, and AT12 is a distance on the optical axis from an image side surface of the first lens to an object side surface of the second lens. Alternatively, in the above relationship, SD1/AT12 can be 3.88, 4.00, 5.16, 5.44, 33.48, etc.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.64 < (| R72| + | R82|)/f < 0.94. Wherein R72 is a radius of curvature of the image-side surface of the seventh lens element at the optical axis, R82 is a radius of curvature of the image-side surface of the eighth lens element at the optical axis, and f is an effective focal length of the optical lens assembly. Optionally, (| R72| + | R82|)/f may take on values of 0.64, 0.66, 0.79, 0.87, 0.94, and so on.

In some embodiments, the optical lens 100 further satisfies the following relationship: 11 < (| f4| + | f5|)/f < 33; wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical lens. Alternatively, the ratio (| f4| + | f5|)/f may be 11.94, 12.45, 12.68, 14.90, 32.31, etc.

In some embodiments, the optical lens 100 further satisfies the following relationship: 0.9 < (| CT6| + | CT7| + | CT8|)/BF < 2.2;

wherein CT6 is a central thickness of the sixth lens element on the optical axis, CT7 is a central thickness of the seventh lens element on the optical axis, CT8 is a central thickness of the eighth lens element on the optical axis, and BF is a minimum distance between the sixth lens element and an image plane of the optical lens element on the optical axis. Optionally, (| CT6| + | CT7| + | CT8|)/BF may take on values of 0.97, 1.83, 1.84, 1.92, 2.14, etc.

When the relational expression is satisfied, the optical lens and the photosensitive chip can be ensured to have enough matching space, so that the improvement of the assembly yield of the optical lens is facilitated. In addition, by reasonably arranging the CT6, the CT7 and the CT8, the optical length of the optical lens can be reduced, symmetry is formed, optical distortion is reduced, and imaging quality is improved.

In some embodiments, the optical lens 100 further satisfies the following relationship: 0 < | R81|/| f8| < 0.9; wherein R81 is a radius of curvature of an object-side surface of the eighth lens at the optical axis, and f8 is an effective focal length of the eighth lens. Illustratively, | R81|/| f8| may take on values of 0.05, 0.06, 0.56, 0.67, 0.86, etc.

The reasonable focal power and the curvature radius of the eighth lens are arranged, so that the surface type complexity of the eighth lens is low, the increase of field curvature and distortion in the T direction is inhibited to a certain extent, the forming difficulty is reduced, and the integral image quality of the optical lens is improved. When | R81|/| f8| <0, the central region of the eighth lens is too curved; when | R81|/| f8| > 0.9, it is easy to cause the peripheral region of the eighth lens to be excessively curved.

In some embodiments, the optical lens 100 further satisfies the following relationship: 0.2< CT45/ET45<1, where CT45 is a distance between the fourth lens and the fifth lens on the optical axis, and ET5 is a thickness of an effective diameter region of the fifth lens. Illustratively, CT45/ET45 may take on values of 0.22, 0.50, 0.66, 0.72, 0.94, and so forth.

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

First embodiment

A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where the optical lens 100 includes a 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, an eighth lens L8, and an infrared filter 90, which are disposed in order from an object side to an image side along an optical axis O.

The refractive power distribution of the eight-piece lens is shown in the following table 1:

TABLE 1

Lens code

L1

L2

L3

L4

L5

L6

L7

L8

Distribution of refractive power

Negative pole

Is just

Negative pole

Is just

Negative pole

Is just

Negative pole

Further, the first object-side surface 11 and the first image-side surface 12 are concave at the paraxial region, the second object-side surface 21 is concave at the paraxial region, and the second image-side surface 22 is convex at the paraxial region. The third object-side surface 31 is concave at the paraxial region, the third image-side surface 32 is convex at the paraxial region, the fourth object-side surface 41 is convex at the paraxial region, and the fourth image-side surface 42 is convex at the paraxial region. The fifth object-side surface 51 is concave at the paraxial region, the fifth image-side surface 52 is concave at the paraxial region, the sixth object-side surface 61 is convex at the paraxial region, the sixth image-side surface 62 is concave at the paraxial region, the seventh object-side surface 71 is concave at the paraxial region, and the seventh image-side surface 72 is convex at the paraxial region. The eighth object-side surface 81 is convex at the paraxial region, and the eighth image-side surface 82 is concave at the paraxial region.

Further, the first object-side surface 11 and the first image-side surface 12 are respectively convex and concave at the circumference. The second object-side surface 21 and the second image-side surface 22 are both concave at the circumference, the third object-side surface 31 and the third image-side surface 32 are both concave and convex at the circumference, the fourth object-side surface 41 and the fourth image-side surface 42 are both convex at the circumference, the fifth object-side surface 51 is concave at the circumference, and the fifth image-side surface 52 is convex at the circumference. The sixth object-side surface 61 and the sixth image-side surface 62 are circumferentially concave, and the seventh object-side surface 71 and the seventh image-side surface 72 are circumferentially concave. The eighth object-side surface 81 and the eighth image-side surface 82 are concave and convex, respectively, at the circumference.

Further, the object-side surface and the image-side surface of the eight lenses are aspheric. The parametric formula for the aspheric surface is:

wherein X is the point on the aspheric surface which is Y away from the optical axis and the relative distance between the point and the tangent plane tangent to the intersection point on the aspheric surface optical axis; y is the perpendicular distance between the point on the aspheric curve and the optical axis, R is the curvature radius, k is the cone coefficient, and Ai is the aspheric coefficient of the ith order.

Furthermore, the eight lenses are made of plastic, so that the overall weight of the optical lens 100 is reduced, and the light and thin design is facilitated.

Specifically, taking as an example that the effective focal length f of the optical lens 100 is 2.27mm, the field angle FOV of the optical lens 100 is 107.47deg, the f-number FNO is 2.3, and the total length TTL of the optical lens is 5.13mm, the other parameters of the optical lens 100 are respectively given in table 2 and table 3 below. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 2. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 2 and 3 correspond to the first object side surface 11 and the first image side surface 12 of the first lens L1, respectively. The Y radius in table 2 is the radius of curvature of the object or image side at the paraxial region for the respective face number. The first value in the "thickness" parameter list of the first lens element L1 is the thickness (center thickness) of the lens element along 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 subsequent lens element along the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens and the optical axis O), the direction from the object-side surface of the first lens L1 to the image-side surface of the last lens is defined as the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the object-side surface of the subsequent lens, and if the thickness of the stop 102 is positive, the stop 102 is disposed on the left side of the vertex of the object-side. Table 3 is a table of the relevant parameters for the aspheric surface of each lens in Table 2, where k is the cone coefficient and Ai is the i-th order aspheric coefficient. The refractive index, abbe number, and focal length of each lens are numerical values at a reference wavelength. It is understood that the units of the radius Y, thickness, and focal length in table 2 are all mm.

TABLE 2

TABLE 3

Referring to fig. 2(a), fig. 2(a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 486.1327nm, 587.5618nm and 656.2725 nm. In fig. 2(a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2(a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 2(B), fig. 2(B) is a diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 587.5618 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 2(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2(C), fig. 2(C) is a graph illustrating a distortion curve of the optical lens 100 at a wavelength of 587.5618nm 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. As can be seen from fig. 2(C), the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 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 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, an eighth lens L8, and an infrared filter 90, which are disposed in this order from the object side to the image side along the optical axis O.

The refractive power distribution of the eight-piece lens is shown in the following table 4:

TABLE 4

Lens code

L1

L2

L3

L4

L5

L6

L7

L8

Distribution of refractive power

Negative pole

Is just

Negative pole

Is just

Negative pole

Further, the first object-side surface 11 and the first image-side surface 12 are convex and concave at the paraxial region, respectively, the second object-side surface 21 is concave at the paraxial region, and the second image-side surface 22 is convex at the paraxial region. The third object-side surface 31 is concave at the paraxial region, the third image-side surface 32 is convex at the paraxial region, the fourth object-side surface 41 is convex at the paraxial region, and the fourth image-side surface 42 is convex at the paraxial region. The fifth object-side surface 51 is convex at a paraxial region, the fifth image-side surface 52 is concave at a paraxial region, the sixth object-side surface 61 is convex at a paraxial region, the sixth image-side surface 62 is concave at a paraxial region, the seventh object-side surface 71 is concave at a paraxial region, and the seventh image-side surface 72 is convex at a paraxial region. The eighth object-side surface 81 is convex at the paraxial region, and the eighth image-side surface 82 is concave at the paraxial region.

Further, the first object-side surface 11 and the first image-side surface 12 are respectively convex and concave at the circumference. The second object-side surface 21 and the second image-side surface 22 are both concave at the circumference, the third object-side surface 31 and the third image-side surface 32 are both concave and convex at the circumference, the fourth object-side surface 41 and the fourth image-side surface 42 are both convex at the circumference, the fifth object-side surface 51 is convex at the circumference, and the fifth image-side surface 52 is concave at the circumference. The sixth object-side surface 61 and the sixth image-side surface 62 are convex and concave, respectively, at the circumference, and the seventh object-side surface 71 and the seventh image-side surface 72 are concave and convex, respectively, at the circumference. The eighth object-side surface 81 and the eighth image-side surface 82 are convex and concave, respectively, at the circumference.

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

In the second embodiment, the effective focal length f of the optical lens 100 is 2.43mm, the field angle FOV of the optical lens 100 is 104.21deg, the f-number FNO is 2.25, and the total length TTL of the optical lens is 5.45 mm.

Other parameters in the second embodiment are shown in the following table 5 and table 6, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 5 are mm.

TABLE 5

TABLE 6

Further, please refer to fig. 4(a), which shows a light spherical aberration curve chart of the optical lens 100 in the second embodiment at 486.1327nm, 587.5618nm, and 656.2725 nm. In fig. 4(a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 4(a), the spherical aberration value of the optical lens 100 in the second embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 4(B), fig. 4(B) is a diagram of astigmatism of light of the optical lens 100 in the second embodiment at a wavelength of 587.5618 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 4(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 4(C), fig. 4(C) is a graph illustrating a distortion curve of the optical lens 100 at a wavelength of 587.5618nm in the second embodiment. 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. 4(C), the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

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, an eighth lens L8, and an infrared filter 90, which are disposed in this order from the object side to the image side along the optical axis O.

The refractive power distribution of the eight-piece lens is shown in the following table 7:

TABLE 7

Lens code

L1

L2

L3

L4

L5

L6

L7

L8

Distribution of refractive power

Negative pole

Is just

Negative pole

Is just

Negative pole

Further, the first object-side surface 11 and the first image-side surface 12 are concave at the paraxial region, the second object-side surface 21 is concave at the paraxial region, and the second image-side surface 22 is concave at the paraxial region. The third object-side surface 31 is convex at the paraxial region, the third image-side surface 32 is convex at the paraxial region, the fourth object-side surface 41 is convex at the paraxial region, and the fourth image-side surface 42 is convex at the paraxial region. The fifth object-side surface 51 is concave at the paraxial region, the fifth image-side surface 52 is concave at the paraxial region, the sixth object-side surface 61 is convex at the paraxial region, the sixth image-side surface 62 is concave at the paraxial region, the seventh object-side surface 71 is convex at the paraxial region, and the seventh image-side surface 72 is convex at the paraxial region. The eighth object-side surface 81 is convex at the paraxial region, and the eighth image-side surface 82 is concave at the paraxial region.

Further, the first object-side surface 11 and the first image-side surface 12 are respectively convex and concave at the circumference. The second object-side surface 21 and the second image-side surface 22 are both concave at the circumference, the third object-side surface 31 and the third image-side surface 32 are both convex at the circumference, the fourth object-side surface 41 and the fourth image-side surface 42 are both convex at the circumference, the fifth object-side surface 51 is concave at the circumference, and the fifth image-side surface 52 is concave at the circumference. The sixth object-side surface 61 and the sixth image-side surface 62 are circumferentially concave, and the seventh object-side surface 71 and the seventh image-side surface 72 are circumferentially convex and concave, respectively. The eighth object-side surface 81 and the eighth image-side surface 82 are concave and convex, respectively, at the circumference.

In the third embodiment, the effective focal length f of the optical lens 100 is 2.17mm, the field angle FOV of the optical lens 100 is 110deg, the f-number FNO is 2.2, and the total length TTL of the optical lens is 5.00 mm.

The other parameters in the third embodiment are shown in the following table 8 and table 9, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 8 are mm.

TABLE 8

TABLE 9

Further, please refer to fig. 6(a), which shows a light spherical aberration curve diagram of the optical lens 100 in the third embodiment at 486.1327nm, 587.5618nm, and 656.2725 nm. In fig. 6(a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 6(a), the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 6(B), fig. 6(B) is a diagram of astigmatism of light of the optical lens 100 in the third embodiment at a wavelength of 587.5618 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 6(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 6(C), fig. 6(C) is a distortion curve diagram of the optical lens 100 in the third embodiment at a wavelength of 587.5618 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. 6(C), the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

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, an eighth lens L8, and an infrared filter 90, which are disposed in this order from the object side to the image side along the optical axis O.

The refractive power distribution of the eight-piece lens is shown in the following table 10:

watch 10

Lens code

L1

L2

L3

L4

L5

L6

L7

L8

Distribution of refractive power

Negative pole

Is just

Negative pole

Is just

Negative pole

Is just

Negative pole

Is just

Further, the first object-side surface 11 and the first image-side surface 12 are concave and convex at the paraxial region, respectively, the second object-side surface 21 is concave at the paraxial region, and the second image-side surface 22 is convex at the paraxial region. The third object-side surface 31 is concave at the paraxial region, the third image-side surface 32 is concave at the paraxial region, the fourth object-side surface 41 is convex at the paraxial region, and the fourth image-side surface 42 is convex at the paraxial region. The fifth object-side surface 51 is concave at the paraxial region, the fifth image-side surface 52 is convex at the paraxial region, the sixth object-side surface 61 is concave at the paraxial region, the sixth image-side surface 62 is convex at the paraxial region, the seventh object-side surface 71 is convex at the paraxial region, and the seventh image-side surface 72 is concave at the paraxial region. The eighth object-side surface 81 is convex at the paraxial region, and the eighth image-side surface 82 is concave at the paraxial region.

Further, the first object-side surface 11 and the first image-side surface 12 are respectively convex and concave at the circumference. The second object-side surface 21 and the second image-side surface 22 are concave and convex at the circumference, the third object-side surface 31 and the third image-side surface 32 are concave and convex at the circumference, the fourth object-side surface 41 and the fourth image-side surface 42 are convex at the circumference, the fifth object-side surface 51 is concave at the circumference, and the fifth image-side surface 52 is concave at the circumference. The sixth object-side surface 61 and the sixth image-side surface 62 are concave and convex at the circumference, respectively, and the seventh object-side surface 71 and the seventh image-side surface 72 are convex at the circumference. The eighth object-side surface 81 and the eighth image-side surface 82 are concave and convex, respectively, at the circumference.

In the fourth embodiment, the effective focal length f of the optical lens 100 is 2.54mm, the field angle FOV of the optical lens 100 is 101.34deg, the f-number FNO is 2.15, and the total length TTL of the optical lens is 5.51 mm.

The other parameters in the fourth embodiment are shown in the following table 11 and table 12, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 11 are mm.

TABLE 11

TABLE 12

Further, referring to fig. 8(a), a light spherical aberration curve chart of the optical lens 100 in the fourth embodiment at 486.1327nm, 587.5618nm and 656.2725nm is shown. In fig. 8(a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 8(a), the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 8(B), fig. 8(B) is a diagram of astigmatism of light of the optical lens 100 in the fourth embodiment at a wavelength of 587.5618 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 8(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 8(C), fig. 8(C) is a distortion curve diagram of the optical lens 100 in the fourth embodiment at a wavelength of 587.5618 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. 8(C), the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

Fifth embodiment

Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth 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, an eighth lens L8, and an infrared filter 90, which are disposed in this order from the object side to the image side along the optical axis O.

The refractive power distribution of the eight-piece lens is shown in the following table 13:

watch 13

Lens code

L1

L2

L3

L4

L5

L6

L7

L8

Distribution of refractive power

Is just

Negative pole

Is just

Negative pole

Is just

Negative pole

Further, the first object-side surface 11 and the first image-side surface 12 are concave and convex at the paraxial region, respectively, the second object-side surface 21 is convex at the paraxial region, and the second image-side surface 22 is convex at the paraxial region. The third object-side surface 31 is concave at the paraxial region, the third image-side surface 32 is convex at the paraxial region, the fourth object-side surface 41 is convex at the paraxial region, and the fourth image-side surface 42 is convex at the paraxial region. The fifth object-side surface 51 is concave at the paraxial region, the fifth image-side surface 52 is concave at the paraxial region, the sixth object-side surface 61 is concave at the paraxial region, the sixth image-side surface 62 is convex at the paraxial region, the seventh object-side surface 71 is concave at the paraxial region, and the seventh image-side surface 72 is convex at the paraxial region. The eighth object-side surface 81 is convex at the paraxial region, and the eighth image-side surface 82 is concave at the paraxial region.

Further, the first object-side surface 11 and the first image-side surface 12 are concave and convex at the circumference, respectively. The second object-side surface 21 and the second image-side surface 22 are both concave at the circumference, the third object-side surface 31 and the third image-side surface 32 are both concave at the circumference, the fourth object-side surface 41 and the fourth image-side surface 42 are both convex at the circumference, the fifth object-side surface 51 is concave at the circumference, and the fifth image-side surface 52 is concave at the circumference. The sixth object-side surface 61 and the sixth image-side surface 62 are circumferentially concave and convex, respectively, and the seventh object-side surface 71 and the seventh image-side surface 72 are circumferentially concave and convex, respectively. The eighth object-side surface 81 and the eighth image-side surface 82 are concave and convex, respectively, at the circumference.

In the fifth embodiment, the effective focal length f of the optical lens 100 is 3.09mm, the field angle FOV of the optical lens 100 is 90.20deg, the f-number FNO is 2.1, and the total length TTL of the optical lens is 4.70 mm.

The other parameters in the fifth embodiment are shown in the following table 14 and table 15, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 14 are mm.

TABLE 14

Watch 15

Further, referring to fig. 10(a), a light spherical aberration curve chart of the optical lens 100 in the fifth embodiment at 486.1327nm, 587.5618nm and 656.2725nm is shown. In fig. 10(a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 10(a), the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 10(B), fig. 10(B) is a diagram of astigmatism of light of the optical lens 100 in the fifth embodiment at a wavelength of 587.5618 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 10(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 10(C), fig. 10(C) is a graph illustrating a distortion curve of the optical lens 100 at a wavelength of 587.5618nm in the fifth embodiment. 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. 10(C), the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

Please refer to table 16, which is a summary table of the relations and the ratios or values thereof in the first to fifth embodiments of the present application.

TABLE 16

Relation/embodiment	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment
						Almax	30deg	30deg	30deg	30deg	30deg
FOV	107.47deg	104.21deg	110deg	101.34deg	90.2deg
						FNO	2.3	2.25	2.2	2.15	2.1
FOV/f	47.34deg/mm	42.88deg/mm	50.69deg/mm	39.89deg/mm	29.19deg/mm
						SD1/ImgH	0.37	0.36	0.36	0.41	0.42
SD1/AT12	5.16	3.88	5.44	4.00	33.48
						(\|R72\|+\|R82\|)/f	0.87	0.64	0.66	0.94	0.79
(\|f4\|+\|f5\|)/f	12.45	11.94	32.31	14.90	12.67
						(\|CT6\|+\|CT7\|+\|CT8\|)/BF	1.83	1.92	1.84	2.14	0.97
\|R81\|/\|f8\|	0.86	0.67	0.56	0.06	0.05
						CT45/ET45	0.72	0.67	0.50	0.22	0.94

Referring to fig. 11, the present application further discloses a camera module 200, which includes an image sensor 201 and the optical lens 100 according to any of the first to fifth embodiments, wherein the image sensor 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 image sensor 201, and the image sensor 201 is configured to convert the optical signal corresponding to the subject into an image signal. It can be understood that the camera module 200 having the optical lens 100 has all the technical effects of the optical lens 100, that is, the miniaturization design can be satisfied, and the difficulty in processing and molding the lens of the optical lens 100 can be reduced. In addition, through reasonable configuration of refractive power, the capturing capability of the optical lens 100 for low-frequency details can be improved, and the design requirement of high image quality can be met.

Referring to fig. 12, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a housing 301 and the camera module 200, and the camera module 200 is disposed on the housing 301. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the miniaturization design can be satisfied, and the difficulty in processing and molding the lens of the optical lens 100 can be reduced. In addition, through reasonable configuration of refractive power, the capturing capability of the optical lens 100 for low-frequency details can be improved, and the design requirement of high image quality can be met.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are introduced in detail, and the principle and the implementation of the present invention are explained by using specific examples, and the explanation of the above embodiments is only used to help understanding the optical lens, the camera module and the electronic device and the core idea thereof; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, and in summary, the content of the present specification should not be understood as the limitation of the present invention.

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, a seventh lens and an eighth lens which are arranged in sequence from an object side to an image side along an optical axis;

the first lens element with refractive power;

the second lens element with refractive power;

the third lens element with refractive power;

the fifth lens element with negative refractive power;

the sixth lens element with refractive power;

the seventh lens element with refractive power;

the eighth lens element with refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof; the optical lens satisfies the following relation:

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

FOV>90deg，FNO≤2.3；

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

51deg/mm>FOV/f>29deg/mm；

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

SD1/ImgH<0.43；

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

SD1/AT12<34；

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

0.64＜(|R72|+|R82|)/f＜0.94；

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

11＜(|f4|+|f5|)/f＜33；

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

0.9＜(|CT6|+|CT7|+|CT8|)/BF＜2.2；

wherein CT6 is a central thickness of the sixth lens element on the optical axis, CT7 is a central thickness of the seventh lens element on the optical axis, CT8 is a central thickness of the eighth lens element on the optical axis, and BF is a minimum distance between the sixth lens element and an image plane of the optical lens element on the optical axis.

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

0＜|R81|/|f8|＜0.9；

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

0.2< CT45/ET45<1, where CT45 is a distance between the fourth lens and the fifth lens on the optical axis, and ET5 is a thickness of an effective diameter region of the fifth lens.

11. An optical lens according to any one of claims 1 to 10, characterized in that: the optical lens further comprises a diaphragm and an infrared filter, the diaphragm is arranged between the third lens and the fourth lens, and the infrared filter is arranged between the image side of the seventh lens and the image side of the optical lens.

12. The utility model provides a module of making a video recording which characterized in that: the camera module comprises an image sensor and the optical lens of any one of claims 1 to 11, wherein the image sensor is arranged on the image side of the optical lens.

13. An electronic device, characterized in that: the electronic device comprises a housing and the camera module of claim 12, the camera module being disposed on the housing.