CN114740590A

CN114740590A - Optical lens, camera module and electronic equipment

Info

Publication number: CN114740590A
Application number: CN202210185155.1A
Authority: CN
Inventors: 曾晗; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-07-12
Anticipated expiration: 2042-02-28
Also published as: CN114740590B

Abstract

The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens comprises: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface at paraxial region; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface at paraxial region; the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface at paraxial region, respectively; the fourth lens element with refractive power; the fifth lens element with refractive power has a concave object-side surface and a concave image-side surface at paraxial region; the sixth lens element with positive refractive power has a concave object-side surface and a convex image-side surface at paraxial region, respectively; the seventh lens element with refractive power has a concave image-side surface at paraxial region; the eighth lens element with negative refractive power has a concave image-side surface at a paraxial region. The optical lens satisfies the following relation: 5.4mm < ImgH ^2/TTL < 5.7 mm. The optical lens, the camera module and the electronic equipment have the characteristic of large image surface and can improve the imaging quality.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the development of science and technology, the specifications of electronic products are changing day by day, and optical lenses in key parts of the electronic products are also more diversified, so that the electronic products are not only required to be light and thin but also required to have good imaging quality, and are also required to be designed with a large image plane. At present, the miniaturization of the existing optical lens and the demand for a large image plane to be achieved are increasing, but how to realize the imaging of the large image plane of the optical lens and the miniaturization design by shortening the lens length while maintaining good imaging quality is a problem to be solved in the art.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can realize miniaturization, have the characteristic of a large image surface and improve the imaging effect of the optical lens.

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 positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;

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

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

the fourth lens element with refractive power;

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

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

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

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

the optical lens satisfies the following relation:

5.4mm＜ImgH^2/TTL＜5.7mm；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element of the optical lens to an image plane of the optical lens, and ImgH is a half of an image height corresponding to a maximum field angle of the optical lens.

In the optical lens system provided by the application, in order to obtain a high-quality imaging effect, the refractive powers and the surface shapes of the eight lens elements are reasonably configured, that is, the first lens element is set to have positive refractive power, the second lens element is set to have negative refractive power, and the third lens element is set to have positive refractive power, so that the total length of the optical lens system can be shortened, and the chromatic aberration of the optical lens system can be balanced. Because the first lens element and the second lens element have convex-concave surfaces at the paraxial region, the object-side surface of the third lens element is concave at the paraxial region, and the image-side surface of the third lens element is convex at the paraxial region, the surface-type structure matching mode can increase the surface-type matching degree of the front lens group (i.e., the first lens element, the second lens element and the third lens element), reduce the incident angle of incident light, further reduce the occurrence of chromatic aberration, and improve the imaging quality of the optical lens assembly. Meanwhile, the first lens, the second lens and the third lens are designed to be concave-convex lenses, so that the thicknesses of the first lens, the second lens and the third lens on an optical axis can be reduced, the total length of the optical lens can be shortened, and the miniaturization design of the optical lens is facilitated. After the incident light is further diffused by the fourth lens element with refractive power and the fifth lens element with refractive power having a concave object-side surface at a paraxial region, the incident angle of the incident light is corrected by the sixth lens element with positive refractive power to reduce high-order aberration. After the incident light passes through the eighth lens element with negative refractive power, the incident light is incident on the imaging surface of the optical lens at a smaller incident angle, so that the illuminance of the optical lens can be effectively improved, and high-quality imaging of the optical lens is realized. Since the half-image height determines the size of the image sensor, the larger the half-image height is, the larger the supportable maximum image sensor size is, and when the optical lens satisfies the following relation: when the ImgH ^2/TTL is more than 5.4mm and less than 5.7mm, the optical lens can support a high-pixel image sensor to realize the large image plane imaging effect, so that the resolution of the optical lens is improved, and the high-quality imaging effect is obtained. Meanwhile, when the total length of the optical lens is reduced, the total length of the optical lens can be compressed, thereby making it easy to achieve ultra-thinning and miniaturization of the optical lens.

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

2＜|F2/F123|＜3；

wherein F2 is the focal length of the second lens, and F123 is the combined focal length of the first lens, the second lens, and the third lens.

When the above relational expression is satisfied, the refractive powers of the second lens element and the third lens element in the front three lens elements are reasonably distributed, so that the aberration of the first lens element and the aberration of the third lens element in the image side direction can be effectively balanced, and the marginal light rays emitted from the third lens element can be favorably and reasonably expanded at a smaller angle, thereby being favorable for realizing large image plane characteristics of the optical lens, and meanwhile, the refractive powers of the first lens element and the third lens element can be also reasonable, the incident light rays can be effectively converged, the total length of the optical lens can be favorably shortened, and further the miniaturization design of the optical lens is favorably realized.

3mm＜F/FNO＜3.5mm；

wherein F is a focal length of the optical lens, and FNO is an F-number of the optical lens.

When the relation is satisfied, the optical lens can keep a larger focal length and have a smaller f-number at the same time, so that the optical lens has a sufficient light transmission amount, the imaging quality is effectively improved, and a picture with good definition can be obtained particularly in a dark environment. When the light quantity is lower than the lower limit, the diaphragm number is too large, the diaphragm is too small, the light transmission quantity of the optical lens is insufficient, and the imaging definition is reduced due to insufficient brightness of an imaging surface; when the focal length of the optical lens exceeds the upper limit, the optical total length of the optical lens is too long to be compressed, so that the volume of the optical lens is increased, and the optical lens is not favorable for meeting the miniaturization design requirement.

1＜F6/F1＜2.4；

wherein F6 is the focal length of the sixth lens and F1 is the focal length of the first lens.

By reasonably configuring the ratio of the focal lengths of the sixth lens element and the first lens element, the refractive powers of the front and rear ends of the optical lens are reasonably distributed, and the contribution amounts of the spherical aberration of the respective lens elements can be balanced, so that the spherical aberration of the optical lens is effectively corrected, and the reasonable refractive power distribution is favorable for compressing the total length of the optical lens and realizing the miniaturization design. When the ratio of the focal lengths of the sixth lens element and the first lens element exceeds the upper limit of the above relation, the focal length provided by the first lens element is too small, the refractive power is too large, the correction capability for the spherical aberration of the optical lens is strong, the refractive power provided by the sixth lens element is too small, the correction capability for the spherical aberration of the optical lens is weak, the correction burden between the lens elements is not balanced enough, and the improvement of the imaging quality of the optical lens is not facilitated. When the refractive power exceeds the lower limit of the relationship, the refractive power provided by the sixth lens element is too large to facilitate the compression of the total length of the optical lens assembly.

1 < (R6F + R6R)/(R6F-R6R) < 2.5; and/or, 0.9 < | SAG61/CT6| < 1.5;

wherein R6F is a radius of curvature of an object-side surface of the sixth lens at the optical axis, R6R is a radius of curvature of an image-side surface of the sixth lens at the optical axis, SAG61 is a distance in the optical axis direction from a maximum effective aperture of the object-side surface of the sixth lens to an intersection of the object-side surface of the sixth lens and the optical axis (i.e., a rise at the maximum effective aperture of the object-side surface of the sixth lens), and CT6 is a thickness of the sixth lens in the optical axis (i.e., a center thickness of the sixth lens).

When the relation 1 < (R6F + R6R)/(R6F-R6R) < 2.5 is satisfied, the curvature radius of the object side surface of the sixth lens at the optical axis and the curvature radius of the image side surface of the sixth lens at the optical axis can be configured appropriately, so that the shape of the sixth lens is not excessively bent, the aberration of the optical lens is corrected, the performance change sensitivity of the optical lens can be reduced, and the processing yield of the sixth lens is improved.

When the relation 0.9 < | SAG61/CT6| < 1.5 is satisfied, the shape of the sixth lens can be well controlled, so that the manufacturing and molding of the sixth lens are facilitated, and the defect of poor molding is reduced. Meanwhile, the field curvature generated by each lens of an object space can be trimmed, and the balance of the field curvature of the optical lens is ensured, namely the field curvatures of different fields tend to be balanced, so that the image quality of an imaging picture of the whole optical lens is uniform, and the imaging quality of the optical lens is improved. When the optical axis is lower than the lower limit of the relational expression, the surface shape of the object side surface of the sixth lens at the circumference is too smooth, the deflection capability of the light rays in the off-axis field of view is insufficient, and the correction of distortion and field curvature aberration is not facilitated. When the upper limit of the relation is exceeded, the surface shape of the object side surface of the sixth lens at the circumference is excessively bent, which may cause poor molding and affect the manufacturing yield of the sixth lens.

0.7＜SD71/SD81＜0.9；

wherein SD71 is the maximum effective aperture of the object side surface of the seventh lens, and SD81 is the maximum effective aperture of the object side surface of the eighth lens.

The seventh lens and the eighth lens are used as lenses closest to an imaging surface, the sizes of the apertures of the seventh lens and the eighth lens influence the size of the imaging surface finally, and reasonable deflection of light rays is facilitated by reasonably controlling the proportion of the maximum effective apertures of the seventh lens and the eighth lens, and the light rays are smoothly transited to the imaging surface of the optical lens. When the maximum effective aperture of the object side surface of the eighth lens is too small, light cannot be effectively deflected and is transmitted to an imaging surface of the optical lens, and large image surface characteristics of the optical lens are not facilitated; when the aperture difference between the seventh lens and the eighth lens is smaller than the lower limit of the relational expression, the aperture difference between the seventh lens and the eighth lens is too large, the angle of a chief ray of the marginal field of view is too large, the relative illumination of an imaging area corresponding to the marginal field of view is easy to be insufficient, and a marginal dark angle is easy to appear during imaging.

1.2＜CTAL/ATAL＜1.5；

wherein CTAL is the sum of the thicknesses of the first lens to the eighth lens on the optical axis, and ATAL is the sum of the gaps of the first lens to the eighth lens on the optical axis.

When the relation is satisfied, the thicknesses and the gaps of all the lenses from the first lens to the eighth lens on the optical axis can be reasonably configured, each lens has enough space for surface shape change and arrangement, which is beneficial to the injection molding and assembly of each lens, and meanwhile, each lens changes and arranges the surface shape in enough space, so that the deflection angle of a principal ray is smaller, stray light generated by the optical lens is reduced, and the imaging quality of the optical lens is improved.

1.1＜CT7/ET7＜2.5；

wherein CT7 is a thickness of the seventh lens in the optical axis (i.e., a center thickness of the seventh lens), and ET7 is a thickness of an effective diameter edge of the seventh lens in a direction parallel to the optical axis (i.e., an edge thickness of the seventh lens).

When the relation is satisfied, the central thickness and the edge thickness of the seventh lens can be reasonably configured, so that the deflection angle of light passing through the seventh lens is smaller, the generation of stray light in the optical lens is reduced, and the imaging quality of the optical lens is improved. In addition, when the relation is satisfied, the design and manufacturing sensitivity of the seventh lens can be reduced, the injection molding and assembly of the seventh lens are facilitated, the injection molding yield of the seventh lens is improved, and the production cost of the seventh lens is reduced.

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

The camera module with the optical lens can realize miniaturization design, can also realize large image plane imaging, and can improve the resolving power of the camera module and improve the imaging effect of the camera module.

In a third aspect, the invention discloses an electronic device, which includes a housing and the camera module set according to the second aspect, wherein the camera module set is disposed on the housing.

The electronic equipment with the camera module can realize miniaturization design, can also realize large image plane imaging, and can improve the resolving power of the camera module and improve the imaging effect of the camera module.

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

in the optical lens provided by the application, in order to obtain a high-quality imaging effect, the refractive power and the surface shape of the eight lenses are reasonably configured, and the optical lens is limited to satisfy the relational expression: 5.4mm < ImgH 2/TTL < 5.7 mm. The half image height determines the size of the image sensor, the larger the half image height is, the larger the size of the maximum image sensor which can be supported is, and when the relation is satisfied, the optical lens can support the high-pixel image sensor to realize the large image plane imaging effect, so that the resolution of the optical lens is improved, and the high-quality imaging effect is obtained. Meanwhile, when the total length of the optical lens is reduced, the total length of the optical lens can be compressed, thereby making it easy to achieve ultra-thinning and miniaturization of the optical lens.

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 longitudinal 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 a second embodiment of the present application;

fig. 4 is a longitudinal 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 longitudinal 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 longitudinal 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 longitudinal 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 clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

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

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

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

Moreover, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific type and configuration may or may not be the same), 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 examples and drawings.

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, where 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. The first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power or negative refractive power, the fifth lens element L5 has negative refractive power or positive refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power or negative refractive power, and the eighth lens element L8 has negative refractive power. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in sequence from the object side of the first lens L1, and finally form an image on the image forming surface 101 of the optical lens 100.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex at the paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region O; the object-side surface 31 of the third lens element L3 is concave at the paraxial region O, and the image-side surface 32 of the third lens element L3 is convex at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is convex or concave at the paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex or concave at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is concave at the paraxial region O, and the image-side surface 52 of the fifth lens element L5 is convex or concave at the paraxial region O; the object-side surface 61 of the sixth lens element L6 is concave at the paraxial region O, and the image-side surface 62 of the sixth lens element L6 is convex at the paraxial region O; the object-side surface 71 of the seventh lens element is convex or concave at the paraxial region O, and the image-side surface 72 of the seventh lens element is concave at the paraxial region O; the object-side surface 81 of the eighth lens element L8 is convex or concave at the paraxial region O, and the image-side surface 82 of the eighth lens element L8 is concave at the paraxial region O.

In some embodiments, the optical lens 100 may be applied to electronic devices such as smart phones and smart tablets, and therefore, 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 be made of plastic, so as to achieve the lightness and thinness of the optical lens 100 and facilitate the processing of the lens with complex surface. It is understood that, in other embodiments, when the optical lens 100 is applied to an electronic device such as a vehicle-mounted device, a driving recorder, or an automobile, or is applied to an automobile and used as a camera on an automobile body, 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 glass lenses, so that the optical lens 100 has a good optical effect and the temperature sensitivity may also be reduced.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop and/or a field stop, which may be disposed between the object side of the optical lens 100 and the object side 11 of the first lens L1. It is understood that, in other embodiments, the diaphragm 102 may be disposed between other lenses, and the arrangement is adjusted according to the actual situation, and the embodiment is not particularly limited.

In some embodiments, the optical lens 100 further includes an infrared filter 90, and the infrared filter 90 is disposed between the eighth lens element L8 and the image plane 101 of the optical lens 100. The infrared filter 90 is selected for use, so that infrared light can be filtered, the imaging quality is improved, and the imaging more conforms to the visual experience of human eyes. It is understood that the infrared filter 90 may be made of an optical glass coating, a colored glass, or an infrared filter 90 made of other materials, which may be selected according to actual needs, and is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship: 5.4mm < ImgH ^2/TTL < 5.7 mm;

wherein, TTL is a distance from the object-side surface 11 of the first lens element L1 of the optical lens system 100 to the image plane 101 of the optical lens system 100 on the optical axis O, and ImgH is a half of the image height (i.e., half image height) corresponding to the maximum field angle of the optical lens system 100. Because the half-image height determines the size of the image sensor, the larger the half-image height is, the larger the supportable maximum image sensor size is, and when the above relation is satisfied, the optical lens 100 can support a high-pixel image sensor to realize a large image plane imaging effect, so as to improve the resolving power of the optical lens 100 and obtain a high-quality imaging effect; meanwhile, as the total length of the optical lens 100 is reduced, the total length of the optical lens 100 can be compressed, thereby making it easy for the optical lens 100 to be ultra-thin and miniaturized. When the lower limit of the above relation is lower, the thickness of each lens in the optical lens 100 is too thin, which is not beneficial to the manufacturing and processing of each lens, increases the design and manufacturing sensitivity of the lens of the optical lens 100, and reduces the production yield of the lens. When the upper limit of the relation is exceeded, the total length of the optical lens 100 is too large, which is disadvantageous for the compact design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 2 < | F2/F123| < 3; f2 is the focal length of the second lens L2, and F123 is the combined focal length of the first lens L1, the second lens L2 and the third lens L3. Through the determination of the above relation, the second lens element L2 can effectively balance the aberration of the first lens element L1 and the aberration of the third lens element L3 in the image side direction, and is favorable for reasonably extending marginal rays emitted from the third lens element L3 at a smaller angle, thereby being favorable for realizing large image plane characteristics of the optical lens 100, and simultaneously, the refractive power of the first lens element L2 to the refractive power of the third lens element L3 can be reasonable, so that the incident rays can be effectively converged, the total length of the optical lens 100 can be favorably shortened, and further the miniaturization design of the optical lens 100 is favorable.

In some embodiments, the optical lens 100 satisfies the following relationship: F/FNO is more than 3mm and less than 3.5 mm;

where F is the focal length of the optical lens 100, and FNO is the F-number of the optical lens 100. When the above relational expression is satisfied, the optical lens 100 can have a small f-number while maintaining a large focal length, so as to ensure that the optical lens 100 has a sufficient light transmission amount, effectively improve the imaging quality, and particularly obtain a picture with good definition in a dark light environment. When the above relation is exceeded, the light passing amount of the optical lens 100 is too large, which causes overexposure of the image and affects the image quality.

In some embodiments, the optical lens 100 satisfies the following relationship: F6/F1 is more than 1 and less than 2.4; where F6 is the focal length of the sixth lens L6, and F1 is the focal length of the first lens L1. By reasonably configuring the ratio of the focal lengths of the sixth lens L6 and the first lens L1, the spherical aberration of the optical lens 100 can be effectively corrected, and the total length of the optical lens 100 can be compressed, thereby realizing a miniaturized design. When the ratio of the focal lengths of the sixth lens element L6 and the first lens element L1 is too large, the refractive power provided by the sixth lens element L6 is too large, and the spherical aberration of the optical lens assembly 100 is less corrected, which is not favorable for improving the imaging quality of the optical lens assembly 100. When the lower limit of the above relation is exceeded, the refractive power provided by the sixth lens element L6 is too small to facilitate the compression of the total length of the optical lens system 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1 < (R6F + R6R)/(R6F-R6R) < 2.5;

wherein R6F is the radius of curvature of the object-side surface 61 of the sixth lens element L6 at the optical axis O, and R6R is the radius of curvature of the image-side surface 62 of the sixth lens element L6 at the optical axis O. When the above relational expression is satisfied, the curvature radius of the object-side surface 61 of the sixth lens element L6 and the curvature radius of the image-side surface 62 of the sixth lens element L6 can be appropriately arranged, so that the shape of the sixth lens element L6 is not excessively curved, and thus the aberration of the optical lens element 100 can be corrected, the performance change sensitivity of the optical lens element 100 can be reduced, and the yield of the sixth lens element L6 can be improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.9 < | SAG61/CT6| < 1.5; here, SAG61 is the distance in the optical axis direction from the maximum effective aperture of the object-side surface 61 of the sixth lens L6 to the intersection point of the object-side surface 61 of the sixth lens L6 and the optical axis (i.e., the rise of the vector at the maximum effective aperture of the object-side surface 61 of the sixth lens L6), and CT6 is the thickness of the sixth lens L6 in the optical axis (i.e., the center thickness of the sixth lens L6).

When the above relationship is satisfied, the shape of the sixth lens L6 can be controlled well, which is advantageous for manufacturing and molding the sixth lens L6, and reduces the defect of poor molding. Meanwhile, the curvature of field generated by each lens of the object space can be trimmed, so that the balance of the curvature of field of the optical lens 100 is ensured, that is, the sizes of the curvature of field of different fields tend to be balanced, thereby enabling the image quality of the imaging picture of the whole optical lens 100 to be uniform and improving the imaging quality of the optical lens 100. When the value is lower than the lower limit of the relational expression, the surface shape of the object-side surface of the sixth lens element L6 at the circumference is too smooth, and the deflection capability of the light rays in the off-axis field is insufficient, which is not favorable for the correction of distortion and field curvature aberration. If the upper limit of the relational expression is exceeded, the object-side surface of the sixth lens L6 is excessively curved in the circumferential direction, which may result in poor molding and affect the manufacturing yield of the sixth lens L6.

In some embodiments, the optical lens 100 satisfies the following relationship: SD71/SD81 of 0.7 is less than 0.9; herein, SD71 is the maximum effective aperture of the object-side surface 71 of the seventh lens L7, and SD81 is the maximum effective aperture of the object-side surface 81 of the eighth lens L8. By reasonably controlling the ratio of the most effective apertures of the seventh lens element L7 and the eighth lens element L9, smooth transition of light to the image plane 101 of the optical lens 100 is facilitated. When the maximum effective aperture of the object-side surface 81 of the eighth lens element L8 is too small, it is not favorable for realizing large image plane characteristics of the optical lens system 100; when the aperture difference between the seventh lens L7 and the eighth lens L8 is too large, the chief ray angle of the marginal field of view is too large, which easily causes insufficient relative illumination of the imaging area corresponding to the marginal field of view, and the marginal dark angle is easy to appear during imaging.

In some embodiments, the optical lens 100 satisfies the following relationship: CTAL/ATAL is more than 1.2 and less than 1.5;

where CTAL is the sum of the thicknesses of the first lens L1 to the eighth lens L8 on the optical axis O (i.e., the sum of the central thicknesses of the eight lenses), and ATAL is the sum of the gaps of the first lens L1 to the eighth lens L8 in the optical axis direction (i.e., the sum of the gaps of the eight lenses).

When the above relational expressions are satisfied, the thicknesses and gaps of all the lenses of the first lens L1 to the eighth lens L8 on the optical axis can be reasonably configured, which is beneficial to the injection molding and assembly of each lens, and simultaneously, the chief ray deflection angle can be smaller, so as to reduce stray light generated by the optical lens 100 and improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.1 < CT7/ET7 < 2.5; here, CT7 is the thickness of the seventh lens L7 on the optical axis O (i.e., the center thickness of the seventh lens L7), and ET7 is the thickness of the effective diameter edge of the seventh lens L7 in the direction parallel to the optical axis (i.e., the edge thickness of the seventh lens L7).

When the above relation is satisfied, the central thickness and the edge thickness of the seventh lens L7 can be reasonably configured, so that the deflection angle of the light passing through the seventh lens L7 is smaller, the generation of stray light in the optical lens 100 is reduced, and the imaging quality of the optical lens is improved. In addition, when the above relational expression is satisfied, the sensitivity of the seventh lens L7 can be reduced, which is favorable for injection molding and assembling of the seventh lens L7, improves the injection molding yield of the seventh lens L7, and reduces the production cost of the seventh lens L7.

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

First embodiment

A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, which are sequentially disposed from an object side to an image side along an optical axis O.

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

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

Specifically, the focal length F of the optical lens 100 is 6.835mm, the F-number FNO of the optical lens 100 is 2.2, half of the maximum field angle (hereinafter referred to as half field angle) HFOV of the optical lens 100 is 43.4553 °, and the total length TTL of the optical lens 100 is 8.15mm, for example, and other parameters of the optical lens 100 are given in table 1 below. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the

surface numbers

2 and 3 correspond to the object side surface and the image side surface of the first lens L1, respectively. The Y radius in table 1 is the curvature radius of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side to the image side of the last lens of the first lens L1 is the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the image side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the object side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the refractive index, abbe number, focal length, etc. in table 1 were obtained at a reference wavelength of 587.6 nm.

In addition,

surface numbers

2 and 3 of the lower surface 1 and the lower surface 2 correspond to the object-side surface 11 and the image-side surface 12 of the first lens L1, respectively, surface numbers 4 and 5 correspond to the object-side surface 21 and the image-side surface 22 of the second lens L2, respectively, and similarly, surface numbers 16 and 17 correspond to the object-side surface 81 and the image-side surface 82 of the eighth lens L8, respectively.

In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1 through the eighth lens L8 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis O direction; c is the curvature of the aspheric 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 below); k is the cone coefficient; ai is a correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 which can be used for the surface numbers 2-17 in the first embodiment.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at 486.1nm, 587.6nm and 656.3 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 587.6 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587.6 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at the wavelength 587.6 nm.

Second embodiment

A schematic structural diagram of an optical lens 100 disclosed in the second embodiment of the present application is shown in fig. 3, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, which are sequentially disposed from an object side to an image side along an optical axis O.

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

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

Specifically, taking as an example that the focal length F of the optical lens 100 is 6.79mm, the F-number FNO of the optical lens 100 is 2.2, the half field angle HFOV of the optical lens 100 is 43.21 °, and the total length TTL of the optical lens 100 is 8.25mm, other parameters of the optical lens 100 are given in table 3 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 3 are all mm, and the refractive index, the abbe number, the focal length, and the like in table 3 are all obtained at the reference wavelength 587.6 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the second embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing description of the embodiments, which is not repeated herein. Table 4 below gives the high-order coefficient coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 which can be used for the surface numbers 2-17 in the second embodiment.

TABLE 3

TABLE 4

Referring to fig. 4, as can be seen from the graph of (a) the longitudinal spherical aberration, (B) the astigmatism of the light beam, and (C) the distortion of fig. 4, the longitudinal spherical aberration, the astigmatism, and the distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Third embodiment

A schematic structural diagram of an optical lens 100 disclosed in the third embodiment of the present application is shown in fig. 5, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, which are arranged in order from an object side to an image side along an optical axis O.

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

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

Specifically, taking the focal length F of the optical lens 100 as 6.783mm, the F-number FNO of the optical lens 100 as 2.1, the half field angle HFOV of the optical lens 100 as 43.46 °, and the total length TTL of the optical lens 100 as 8.2mm as examples, other parameters of the optical lens 100 are given in table 5 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, focal length in table 5 are all mm, and the refractive index, abbe number, focal length, etc. in table 5 are all obtained at the reference wavelength 587.6 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the third embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing description of the embodiments, which is not repeated herein. Table 6 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the third embodiment.

TABLE 5

TABLE 6

Referring to fig. 6, as shown in the graph of (a) the longitudinal spherical aberration, (B) the astigmatism of the light beam, and (C) the distortion of fig. 6, the longitudinal spherical aberration, the astigmatism, and the distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Fourth embodiment

As shown in fig. 7, a schematic structural diagram of an optical lens 100 disclosed in the fourth embodiment of the present application includes, in order from an object side to an image side along an optical axis O, a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90.

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

Specifically, taking the focal length F of the optical lens 100 as 6.966mm, the F-number FNO of the optical lens 100 as 2.3, the half field angle HFOV of the optical lens 100 as 43.12 °, and the total length TTL of the optical lens 100 as 8.4mm as examples, other parameters of the optical lens 100 are given in table 7 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 7 are all mm, and the refractive index, the abbe number, the focal length, and the like in table 7 are all obtained at the reference wavelength 587.6 nm. In addition, please refer to the foregoing first embodiment for the corresponding relationship between the respective serial numbers and the object-side surfaces and the image-side surfaces of the lenses, which is not described herein again.

In the fourth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found from the description of the previous embodiments, which is not repeated herein. Table 8 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the fourth embodiment.

TABLE 7

TABLE 8

Referring to fig. 8, as can be seen from the graph of (a) the longitudinal spherical aberration, (B) the astigmatism of the light beam, and (C) the distortion of fig. 8, the longitudinal spherical aberration, the astigmatism, and the distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Fifth embodiment

A schematic structural diagram of an optical lens 100 disclosed in the fifth embodiment of the present application is shown in fig. 9, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an infrared filter 90, which are arranged in order from an object side to an image side along an optical axis O.

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

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

Specifically, taking the focal length F of the optical lens 100 as 6.932mm, the F-number FNO of the optical lens 100 as 2.1, the half field angle HFOV of the optical lens 100 as 42.84 °, and the total length TTL of the optical lens 100 as 8.4mm as examples, other parameters of the optical lens 100 are given in table 9 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not described herein again. It is understood that the units of the radius Y, the thickness, and the focal length in table 9 are all mm, and the refractive index, the abbe number, the focal length, and the like in table 9 are all obtained at the reference wavelength 587.6 nm. In addition, please refer to the first embodiment for the corresponding relationship between the serial numbers of the respective surfaces and the object-side and image-side surfaces of the respective lenses, which is not described herein again.

In the fifth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the description of the foregoing embodiments, which is not repeated herein. Table 10 below gives the high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in the fifth embodiment.

TABLE 9

Watch 10

Referring to fig. 10, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 10, the longitudinal spherical aberration, the astigmatism and the distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Referring to table 11, table 11 summarizes the ratios of the relations in the first embodiment to the fifth embodiment of the present application.

TABLE 11

Referring to fig. 11, the present application further discloses a camera module 200, wherein the camera module 200 includes an image sensor 201 and the optical lens 100 as described in any of the first to fifth embodiments of the first aspect, and the image sensor 201 is disposed at 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, which is not described herein again. It can be understood that the camera module 200 having the above optical lens 100 has all the technical effects of the above optical lens 100, that is, the camera module 200 can meet the requirement of miniaturization design and can also meet the shooting requirement of large image plane, the resolution of the camera module can be improved, and the imaging effect of the camera module can be improved. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 12, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a housing and the camera module 200, and the camera module 200 is disposed in the housing. 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 electronic device 300 has a feature of a large image plane while satisfying a miniaturized design, and an imaging effect of the electronic device can be effectively improved. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An optical lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element, which are disposed in order from an object side to an image side along an optical axis;

the fourth lens element with refractive power;

the optical lens satisfies the following relation:

5.4mm＜ImgH^2/TTL＜5.7mm；

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

2＜|F2/F123|＜3；

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

3mm＜F/FNO＜3.5mm；

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

1＜F6/F1＜2.4；

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

1 < (R6F + R6R)/(R6F-R6R) < 2.5; and/or 0.9 < | SAG61/CT6| < 1.5;

wherein R6F is a radius of curvature of an object-side surface of the sixth lens at the optical axis, and R6R is a radius of curvature of an image-side surface of the sixth lens at the optical axis; SAG61 is a distance in an optical axis direction from a maximum effective aperture of an object-side surface of the sixth lens to an intersection point of the object-side surface of the sixth lens and the optical axis, and CT6 is a thickness of the sixth lens in the optical axis.

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

0.7＜SD71/SD81＜0.9；

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

1.2＜CTAL/ATAL＜1.5；

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

1.1＜CT7/ET7＜2.5；

wherein CT7 is a thickness of the seventh lens on the optical axis, ET7 is a thickness of an effective diameter edge of the seventh lens in a direction parallel to the optical axis.

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

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