CN113741004A

CN113741004A - Optical lens, camera module and electronic equipment

Info

Publication number: CN113741004A
Application number: CN202110934046.0A
Authority: CN
Inventors: 刘彬彬; 邹海荣; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2021-12-03
Anticipated expiration: 2041-08-13
Also published as: CN113741004B

Abstract

The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens with negative focal power, which is arranged in sequence from an object side to an image side along an optical axis, and the object side surface and the image side surface of the first lens are a concave surface and a convex surface; the object side surface and the image side surface of the second lens are convex and concave; a third lens with positive focal power, wherein the image side surface of the third lens is a convex surface; the object side surface and the image side surface of the fourth lens are concave and convex; the object side surface and the image side surface of the fifth lens are concave and convex; the object side surface and the image side surface of the sixth lens are concave and convex; a seventh lens element with positive refractive power, the object-side surface of which is convex; the object side surface and the image side surface of the eighth lens with negative focal power are convex and concave. The optical lens further satisfies the relation: 0.15mm < TTL/(ImgH × 2)/f <0.2 mm. The optical lens, the camera module and the electronic equipment provided by the embodiment of the invention can meet the shooting requirements of miniaturization and wide view and improve the imaging quality of the electronic equipment.

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 pursuit of miniaturization and wide-view of electronic products, the structural feature of light, thin and small optical lens gradually becomes the development trend of the optical lens. In the related art, the design and manufacture of optical lenses of electronic devices such as mobile phones in the aspects of miniaturization and wide view have great problems, and the requirements of miniaturization and wide view of the electronic devices are difficult to meet, so that the imaging quality is not favorably improved.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the requirements of miniaturization and wide view of the electronic equipment.

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 has a negative optical power, the object-side surface of the first lens element is concave at a paraxial region, and the image-side surface of the first lens element is convex at a paraxial region;

the second lens element has a positive optical power, the object-side surface of the second lens element is convex at a paraxial region, and the image-side surface of the second lens element is concave at a paraxial region;

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

the fourth lens has a focal power, the object side surface of the fourth lens is concave at a paraxial region, and the image side surface of the fourth lens is convex at a paraxial region;

the fifth lens has a focal power, the object side surface of the fifth lens is concave at a paraxial region, and the image side surface of the fifth lens is convex at a paraxial region;

the sixth lens element has a negative optical power, the sixth lens element has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

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

the eighth lens element has a negative optical power, an object-side surface of the eighth lens element being convex at a paraxial region thereof, and an image-side surface of the eighth lens element being concave at a paraxial region thereof;

the optical lens satisfies the following relation: 0.15mm1< TTL/(ImgH × 2)/f <0.2 mm;

wherein, TTL is a distance from an object side surface of the first lens element to an imaging surface of the optical lens on the optical axis, ImgH is a radius of a maximum effective imaging circle of the optical lens, and f is an effective focal length of the optical lens.

In the optical lens provided by this embodiment, the first lens with negative focal power is adopted, and the object-side surface of the first lens is a concave surface at the paraxial region, and the image-side surface of the first lens is a convex surface at the paraxial region, which is beneficial for the light rays with a large field range to enter the optical lens, so that the light rays entering the optical lens can be converged, the field angle is improved, and the requirement of wide view is met. The second lens element and the third lens element each have a positive refractive power, wherein an image-side surface of the second lens element is concave at a paraxial region thereof, and an image-side surface of the third lens element is convex at a paraxial region thereof. Therefore, the second lens and the third lens have stronger positive focal power, which is beneficial to converging large-angle light rays emitted by the first lens and realizing the function of delaying the angle of marginal light rays. The fourth lens and the fifth lens both have focal power, wherein the fourth lens and the fifth lens are both in a meniscus shape which is concave towards the object side, so that the aberration of the optical lens can be effectively corrected, and the imaging quality of the optical lens is improved. The sixth lens has negative focal power, so that the field range of the optical lens can be enlarged, and the design requirement of wide view can be realized. The seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface at the paraxial part, the total length of the optical lens can be shortened, aberration can be corrected, the emergent angle of light can be suppressed, and the miniaturization design of the optical lens and the improvement of the imaging quality of the optical lens are facilitated. The eighth lens element has negative focal power, the object-side surface of the eighth lens element is convex at the paraxial region, and the image-side surface of the eighth lens element is concave at the paraxial region, so that the back lowering of the optical lens assembly can be maintained, i.e., the height of the eighth lens element is low, i.e., the height of the eighth lens element in the direction perpendicular to the optical axis is low, so that the optical lens assembly can ensure back focus while realizing wide view, and the edge illumination of the optical lens assembly can be improved, so that the optical lens assembly is not prone to dark corners. Therefore, the optical lens meets the design requirements of miniaturization and wide view and simultaneously achieves high-quality imaging effect by reasonably configuring the focal power and the surface type of each lens. In addition, by controlling the ratio of the product of the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the effective focal length of the optical lens to the radius of the maximum effective imaging circle of the optical lens, the ratio of the height of the optical lens to the imaging surface can be limited to a smaller range. That is, when the above relational expression is satisfied, the optical lens can achieve the design requirements of miniaturization and wide view, which is beneficial to improving the imaging quality of the optical lens.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 1< ImgH/f.

When the relational expression is satisfied, the optical lens can meet the shooting requirement of wide view.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 8< | f8|/| SAG81| < 20; wherein f8 is the focal length of the eighth lens and SAG81 is the maximum sagittal height of the object side of the eighth lens.

Because the focal power of the lens can affect the light ray deflection capability of the optical lens, the light ray deflection capability of the optical lens can be enhanced by controlling the ratio of the focal length of the eighth lens to the distance between the projection of the edge of the optical effective area of the object side surface of the eighth lens on the optical axis and the intersection point of the object side surface of the eighth lens and the optical axis, and the surface shape bending of the object side surface of the eighth lens. When the above relation is satisfied, the focal length and the shape of the eighth lens are reasonably set, so that chromatic aberration and spherical aberration generated by the first lens L1 to the seventh lens L7 can be reduced to the maximum extent, and the imaging quality of the optical lens is further improved. In addition, the focal power of the eighth lens is reasonably distributed, so that the convergence of the optical lens to marginal rays can be enhanced, the size of the optical lens can be compressed, and the requirement on miniaturization of the optical lens is met.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 9< | f8|/| SAG82| < 15; wherein f8 is the focal length of the eighth lens and SAG82 is the maximum sagittal height of the image side surface of the eighth lens.

Since the focal power of the lens affects the ability of the optical lens to absorb light, in order to enhance the ability of the optical lens to absorb light, the ability of the optical lens to absorb light can be enhanced by controlling the ratio of the focal length of the eighth lens to the distance between the edge of the optically effective area of the image side surface of the eighth lens projected on the optical axis and the intersection point of the image side surface of the eighth lens and the optical axis. When the above relation is satisfied, the focal length and the shape of the eighth lens are reasonably set, so that chromatic aberration and spherical aberration generated by the first lens L1 to the seventh lens L7 can be reduced to the maximum extent, and the imaging quality of the optical lens is further improved. In addition, the optical power of the eighth lens is reasonably distributed, so that the light absorption capacity of the optical lens can be enhanced, the size of the optical lens can be compressed, and the requirement on miniaturization of the optical lens is met.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: i SAG11/SAG 82I < 0.5; wherein SAG11 is the maximum sagittal height of the object side of the first lens and SAG82 is the maximum sagittal height of the image side of the eighth lens.

When the inflection position of the eighth lens is more prominent than the inflection position of the first lens, that is, when the maximum distance between a point on the image side surface of the eighth lens and the optical axis is greater than the maximum distance between a point on the object side surface of the first lens and the optical axis, the spherical aberration and the field curvature generated by the first lens to the seventh lens are favorably corrected, so that the focal power configuration of each lens is more uniform. When the relation is satisfied, the focal power of the eighth lens in the direction perpendicular to the optical axis and the thickness of the eighth lens can be reasonably controlled, and the eighth lens is prevented from being too thin or too thick, so that the incident angle of light rays on the image side surface of the eighth lens is reduced, and the sensitivity of the optical lens is reduced.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 1< (| SAG81| + SAG82)/CT8< 2; wherein SAG81 is the maximum sagittal height of the object side surface of the eighth lens, SAG82 is the maximum sagittal height of the image side surface of the eighth lens, and CT8 is the thickness of the eighth lens on the optical axis.

Because the eighth lens is provided with a plurality of focal power points, the distortion and the curvature of field generated by the first lens to the seventh lens can be corrected, and the focal power configuration of the eighth lens close to the imaging surface is more uniform. When the relation is satisfied, the focal power of the eighth lens in the direction perpendicular to the optical axis and the thickness of the eighth lens can be reasonably controlled, and the eighth lens is prevented from being too thin or too thick, so that the incident angle of light rays on the image side surface of the eighth lens is reduced, and the sensitivity of the optical lens is reduced.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 5< | f7/SAG72| < 7; wherein f7 is a focal length of the seventh lens, and SAG72 is a maximum sagittal height of an image side surface of the seventh lens.

When the relation is satisfied, the setting of the focal power and the shape of the seventh lens is reasonable, the chromatic aberration and the spherical aberration of the optical lens can be reduced to the maximum extent, and the imaging quality of the optical lens is improved. In addition, the reasonable focal power distribution of the seventh lens can further strengthen the light absorption capacity of the optical lens, and meanwhile, the size of the optical lens is favorably compressed, and the requirement of miniaturization of the optical lens is met.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 0< Yc82/SD82< 0.5; yc82 is a vertical distance between a tangent plane of the image-side surface of the eighth lens element at the off-axis position, the tangent point being perpendicular to the optical axis, and the tangent point being at the image-side surface of the eighth lens element, and the optical axis, and SD82 is a maximum effective half aperture of the image-side surface of the eighth lens element.

In a second aspect, the present invention discloses a camera module, which includes an image sensor and the optical lens of the first aspect, wherein the image sensor is disposed on the image side of the optical lens. The camera module with the optical lens of the first aspect can meet the requirements of miniaturization and wide view of the camera module and can also improve the imaging quality of the camera module.

In a third aspect, the invention discloses an electronic device, which includes a housing and the camera module set according to the second aspect, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module can meet the requirements of miniaturization and wide view of the electronic equipment and can improve the imaging quality of the electronic equipment.

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

according to the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the optical lens adopts eight lenses with focal powers, and the first lens with negative focal power is adopted, the object side surface of the first lens is a concave surface at a paraxial region, and the image side surface of the first lens is a convex surface at the paraxial region, so that light rays with a large field range can be favorably incident into the optical lens, the light rays incident into the optical lens can be converged, the field angle is improved, and the requirement of wide view is met. The second lens element and the third lens element each have a positive refractive power, wherein an image-side surface of the second lens element is concave at a paraxial region thereof, and an image-side surface of the third lens element is convex at a paraxial region thereof. Therefore, the second lens and the third lens have stronger positive focal power, which is beneficial to converging large-angle light rays emitted by the first lens and realizing the function of delaying the angle of marginal light rays. The fourth lens and the fifth lens both have focal power, wherein the fourth lens and the fifth lens are both in a meniscus shape which is concave towards the object side, so that the aberration of the optical lens can be effectively corrected, and the imaging quality of the optical lens is improved. The sixth lens has negative focal power, so that the field range of the optical lens can be enlarged, and the design requirement of wide view can be realized. The seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface at the paraxial part, the total length of the optical lens can be shortened, aberration can be corrected, the emergent angle of light can be suppressed, and the miniaturization design of the optical lens and the improvement of the imaging quality of the optical lens are facilitated. The eighth lens element has negative focal power, the object-side surface of the eighth lens element is convex at the paraxial region, and the image-side surface of the eighth lens element is concave at the paraxial region, so that the back lowering of the optical lens assembly can be maintained, i.e., the height of the eighth lens element is low, i.e., the height of the eighth lens element in the direction perpendicular to the optical axis is low, so that the optical lens assembly can ensure back focus while realizing wide view, and the edge illumination of the optical lens assembly can be improved, so that the optical lens assembly is not prone to dark corners. The optical lens system reasonably configures the focal power and the surface type of each lens, so that the optical lens system meets the design requirements of miniaturization and wide vision and simultaneously realizes the high-quality imaging effect. In addition, the invention also enables the optical lens to satisfy the following relational expression: 0.15mm < TTL/(ImgH x 2)/f <0.2mm, the ratio of the height of the optical lens to the imaging surface can be limited in a small range, the miniaturization design and the wide-view design requirement of the optical lens are realized, and the imaging quality is favorably improved. That is, the optical lens provided by the invention can meet the requirements of miniaturization and wide view of electronic equipment, and improve the imaging quality of the electronic equipment.

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 according to an embodiment of the present disclosure;

fig. 2 is a light 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 invention;

fig. 4 is a light 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 invention;

fig. 6 is a light 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 the fourth embodiment of the present invention;

fig. 8 is a light 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 the fifth embodiment of the present invention;

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

FIG. 11 is a schematic structural diagram of a camera module according to the present disclosure;

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

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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

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

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

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

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

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

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

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 all may be glass lenses, so that the optical lens 100 has a good optical effect and can reduce the temperature sensitivity of the optical lens 100.

Alternatively, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may be made of plastic, so that the optical lens 100 is light and thin and can be easily processed into a lens with a complex surface.

In some embodiments, one or more aspheric surfaces are included in 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. It is understood that one aspheric lens can achieve the effect of correcting phase difference of a plurality of spherical lenses. That is, the aspheric lens can correct the phase difference and reduce the number of lenses, which is beneficial to meeting the requirement of miniaturization of the optical lens 100 and improving the imaging quality. The specific number of the aspheric lenses may be set according to practical situations, for example, each of the first lens L1 to the eighth lens L8 is an aspheric lens, or any one of the lenses is an aspheric lens, and the embodiment is not particularly limited.

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 image-side surface 22 of the second lens L2 and the object-side surface 31 of the third lens L3 of the optical lens 100. It is understood that, in other embodiments, the stop 102 may also be disposed between other lenses, for example, between the image-side surface 12 of the first lens L1 and the object-side surface 21 of the second lens L2, and the arrangement may be adjusted according to practical situations, and the present embodiment is not limited in particular.

In some embodiments, the optical lens 100 further includes an optical filter 10, and the optical filter 10 is disposed between the eighth lens element L8 and the image plane 101 of the optical lens 100. By selecting the infrared filter 10, infrared light can be filtered, imaging quality is improved, and imaging is more in line with visual experience of human eyes. It is understood that the optical filter 10 may be made of an optical glass coating film or a colored glass, and the specific choice may be made according to actual needs, and the embodiment is not particularly limited.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.15mm < TTL/(ImgH × 2)/f <0.2 mm; wherein, TTL is a distance from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens system 100 on the optical axis O, ImgH is a radius of a maximum effective image circle of the optical lens system 100, and f is an effective focal length of the optical lens system 100. By controlling the ratio of the product of the distance from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens 100 on the optical axis O and the effective focal length of the optical lens 100 to the radius of the maximum effective imaging circle of the optical lens 100, the ratio of the height of the optical lens 100 to the image plane can be limited to a small range. That is, when the above relational expression is satisfied, the optical lens 100 can achieve a design requirement of a compact design and a wide view, which is advantageous for improving the imaging quality of the optical lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< ImgH/f. When the above-described relational expression is satisfied, the optical lens 100 can achieve a wide-view photographing requirement. When ImgH/f is greater than or equal to 1, the optical lens cannot meet the requirement of wide view and cannot meet the shooting requirement of the user on the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 8< | f8|/| SAG81| < 20; where f8 is the focal length of the eighth lens L8, and SAG81 is the maximum sagittal height of the object side 81 of the eighth lens L8. The rise of the object-side surface 81 of the eighth lens L8 is the distance in the direction parallel to the optical axis O between a certain point on the object-side surface 81 of the eighth lens L8 and the intersection point of the object-side surface 81 of the eighth lens L8 and the optical axis O; when the value of the sagittal height is a positive value, this point is closer to the image side of the optical lens 100 than at the center of the object side surface 81 of the eighth lens L8 in the direction parallel to the optical axis O; when the value of the rise is a negative value, the point is closer to the object side of the optical lens 100 than at the center of the object side 81 of the eighth lens L8 in the direction parallel to the optical axis O.

It can be understood that, since the optical power of the lens affects the light beam deflecting ability of the optical lens system, the light beam deflecting ability of the optical lens system 100 can be enhanced by controlling the ratio of the focal length of the eighth lens L8 to the distance between the edge of the optically effective area of the object-side surface 81 of the eighth lens L8 projected on the optical axis O and the intersection point of the object-side surface 81 of the eighth lens L8 and the optical axis O, and the surface-type curvature of the object-side surface 81 of the eighth lens L8. When the above relation is satisfied, the focal length and the shape of the eighth lens element L8 are reasonably set, so that chromatic aberration and spherical aberration generated by the first lens element L1 to the seventh lens element L7 can be minimized, and the imaging quality of the optical lens assembly 100 can be improved. In addition, by reasonably distributing the focal power of the eighth lens L8, the convergence of the peripheral light rays by the optical lens 100 can be enhanced, and the size of the optical lens 100 can be reduced, so that the requirement of miniaturization of the optical lens 100 is met. When the absolute value of f 8/SAG 81 is more than or equal to 20, the focal power of the eighth lens L8 is insufficient, so that the chromatic aberration and spherical aberration correction capability of the optical lens 100 are insufficient, and the imaging quality of the optical lens 100 cannot be ensured; when | f8|/SAG81 ≦ 8, the rise of the object-side surface 81 of the eighth lens L8 is too large, so that the surface form of the eighth lens L8 is too complicated, resulting in an increase in difficulty in molding the eighth lens L8.

In some embodiments, the optical lens 100 satisfies the following relationship: 9< | f8|/| SAG82| < 15; where f8 is the focal length of the eighth lens L8, and SAG82 is the maximum sagittal height of the image-side surface 82 of the eighth lens L8. The rise of the image-side surface 82 of the eighth lens L8 is the distance in the direction parallel to the optical axis O between a certain point on the image-side surface 82 of the eighth lens L8 and the intersection point of the image-side surface 82 of the eighth lens L8 and the optical axis O; when the value of the sagittal height is a positive value, this point is closer to the image side of the optical lens 100 than at the center of the image side surface 82 of the eighth lens L8 in the direction parallel to the optical axis O; when the value of the rise is a negative value, the point is closer to the object side of the optical lens 100 than at the center of the image side surface 82 of the eighth lens L8 in the direction parallel to the optical axis O.

Since the focal power of the lens affects the ability of the optical lens 100 to absorb light, in order to enhance the ability of the optical lens 100 to absorb light, the ability of the optical lens 100 to absorb light can be enhanced by controlling the ratio of the focal length of the eighth lens L8 to the distance between the edge of the optically effective area of the image-side surface 82 of the eighth lens L8 projected on the optical axis O and the intersection point of the image-side surface 82 of the eighth lens L8 and the optical axis O. When the above relation is satisfied, the focal length and the shape of the eighth lens L8 are reasonably set, so that chromatic aberration and spherical aberration generated by the first lens L1 to the seventh lens L7 can be minimized, and the imaging quality of the optical lens is improved. In addition, by reasonably distributing the focal power of the eighth lens L8, the ability of the optical lens 100 to absorb light can be enhanced, and the size of the optical lens 100 can be reduced, so as to meet the requirement of miniaturization of the optical lens. When the power of the eighth lens L8 is insufficient when f 8/SAG 82 is less than or equal to 9, the chromatic aberration and spherical aberration correction capability of the optical lens 100 are insufficient, and the imaging quality of the optical lens 100 cannot be ensured; when | f8|/SAG82 ≧ 15, the rise of the image-side surface 82 of the eighth lens L8 is excessively large, so that the face shape of the eighth lens L8 is excessively complicated, resulting in an increase in difficulty in molding the eighth lens L8.

In some embodiments, the optical lens 100 satisfies the following relationship: i SAG11/SAG 82I < 0.5; where SAG11 is the maximum sagittal height of the object-side surface 11 of the first lens L1 and SAG82 is the maximum sagittal height of the image-side surface 82 of the eighth lens L8. The rise of the object-side surface 11 of the first lens L1 is the distance in the direction parallel to the optical axis O between a certain point on the object-side surface 11 of the first lens L1 and the intersection point of the object-side surface 11 of the first lens L1 and the optical axis O; when the value of the sagittal height is a positive value, the point is closer to the image side of the optical lens 100 than at the center of the object side surface 11 of the first lens L1 in the direction parallel to the optical axis O; when the value of the rise is a negative value, the point is closer to the object side of the optical lens 100 than at the center of the object side 11 of the first lens L1 in the direction parallel to the optical axis O. Likewise, the rise of the image-side surface 82 of the eighth lens L8 is similar to that described above and will not be described again here.

It is understood that the first lens L1 and the eighth lens L8 both have reverse curvature, and when the reverse curvature position of the eighth lens L8 is more protruded than the reverse curvature position of the first lens L1, that is, when the maximum distance between the point on the image side 82 of the eighth lens L8 and the optical axis is greater than the maximum distance between the point on the object side 11 of the first lens L1 and the optical axis O, it is advantageous to correct spherical aberration and curvature of field generated by the first lens L1 to the seventh lens L7, so that the power configurations of the lenses are more uniform. When the above relation is satisfied, the power of the eighth lens L8 in the direction perpendicular to the optical axis O and the thickness of the eighth lens L8 can be reasonably controlled, and the eighth lens L8 is prevented from being too thin or too thick, so that the incident angle of light on the image-side surface 82 of the eighth lens L8 is reduced, and the sensitivity of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship 1< (| SAG81| + SAG82)/CT8< 2; the SAG81 is the maximum sagged height of the object-side surface 81 of the eighth lens L8, the SAG82 is the maximum sagged height of the image-side surface 82 of the eighth lens L8, and the CT8 is the thickness of the eighth lens L8 on the optical axis O. The rise of the object-side surface 81 of the eighth lens L8 is the distance in the direction parallel to the optical axis O between a certain point on the object-side surface 81 of the eighth lens L8 and the intersection point of the object-side surface 81 of the eighth lens L8 and the optical axis O; when the value of the sagittal height is a positive value, this point is closer to the image side of the optical lens 100 than at the center of the object side surface 81 of the eighth lens L8 in the direction parallel to the optical axis O; when the value of the rise is a negative value, the point is closer to the object side of the optical lens 100 than at the center of the object side 81 of the eighth lens L8 in the direction parallel to the optical axis O. Likewise, the rise of the image-side surface 82 of the eighth lens L8 is similar to that described above and will not be described again here.

Since the eighth lens L8 has multiple power points, it is beneficial to correct distortion and curvature of field generated by the first lens L1 to the seventh lens L7, so that the power configuration of the eighth lens L8 near the imaging plane 82 is more uniform. When the above relation is satisfied, the power of the eighth lens L8 in the direction perpendicular to the optical axis O and the thickness of the eighth lens L8 can be reasonably controlled, and the eighth lens L8 is prevented from being too thin or too thick, so that the incident angle of light on the image side 82 of the eighth lens L8 is reduced, and the sensitivity of the optical lens is reduced. When (| SAG81| + SAG82)/CT8 is less than or equal to 1, the thickness of the eighth lens L8 is too thick, the incident angle of light on the image side 82 of the eighth lens L8 is large, and the sensitivity of the optical lens 100 is large; when (| SAG81| + SAG82)/CT8 is equal to or greater than 2, the optical power of the eighth lens L8 is insufficient, resulting in insufficient distortion and curvature of field correction capability for the optical lens 100, affecting the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 5< | f7/SAG72| < 7; where f7 is the focal length of the seventh lens L7, and SAG72 is the maximum sagittal height of the image-side surface 72 of the seventh lens L7. The rise of the image-side surface 72 of the seventh lens L7 is the distance in the direction parallel to the optical axis O between a certain point on the image-side surface 72 of the seventh lens L7 and the intersection point of the image-side surface 72 of the seventh lens L7 and the optical axis O; when the value of the sagittal height is a positive value, this point is closer to the image side of the optical lens 100 than at the center of the image side surface 72 of the seventh lens L7 in the direction parallel to the optical axis O; when the value of the rise is a negative value, the point is closer to the object side of the optical lens 100 than at the center of the image side surface 72 of the seventh lens L7 in the direction parallel to the optical axis O.

When the above relational expression is satisfied, the setting of the focal power and the shape of the seventh lens L7 is more reasonable, so that the chromatic aberration and the spherical aberration of the optical lens 100 can be reduced to the maximum extent, and the imaging quality of the optical lens 100 can be improved. In addition, the reasonable focal power distribution of the seventh lens L7 can further enhance the ability of the optical lens 100 to absorb light, and at the same time, the size of the optical lens 100 can be reduced, thereby meeting the requirement of miniaturization of the optical lens. When the | f7/SAG72| ≧ 7, the focal power of the seventh lens L7 is insufficient, which causes insufficient chromatic aberration and spherical aberration correction capability for the optical lens 100, and further fails to ensure the imaging quality of the optical lens 100; when | f7/SAG72| ≦ 5, the rise of the image-side surface 72 of the seventh lens L7 is too large, so that the surface form of the seventh lens L7 is too complicated, resulting in an increase in difficulty in molding the seventh lens L7.

In some embodiments, the optical lens 100 satisfies the following relationship: 0< Yc82/SD82< 0.5; yc82 is a vertical distance between a tangent plane of the image-side surface of the eighth lens element at the off-axis position, the tangent point being perpendicular to the optical axis, and the image-side surface of the eighth lens element, and the optical axis, and SD82 is a maximum effective half aperture of the image-side surface 82 of the eighth lens element L8. Since the eighth lens L8 has multiple power points, it is beneficial to correct distortion and curvature of field generated by the first lens L1 to the seventh lens L7, so that the power configuration of the eighth lens L8 near the imaging plane 101 is more uniform. When the above relation is satisfied, the power of the eighth lens L8 in the direction perpendicular to the optical axis O and the thickness of the eighth lens L8 can be reasonably controlled, and the eighth lens L8 is prevented from being too thin or too thick, so that the incident angle of light on the image side 82 of the eighth lens L8 is reduced, and the sensitivity of the optical lens is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: n1-n8> 0.04; where n1 is a refractive index of the first lens L1, and n8 is a refractive index of the eighth lens L8. When the above relational expression is satisfied, the ratio of the focal power distribution of the first lens L1 and the eighth lens L8 is appropriate, which is beneficial to reducing the chromatic aberration and the spherical aberration of the optical lens 100 to the maximum, thereby improving the imaging quality of the optical lens 100. In addition, while the above relational expression is satisfied, since the optical power distribution is reasonable, the ability of the optical lens 100 to absorb light can be enhanced, which is favorable for realizing the design requirement of miniaturization of the optical lens 100.

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

Example one

As shown in fig. 1, the optical lens 100 disclosed in the first embodiment of the present invention includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

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

Specifically, other parameters of the optical lens 100 are given in table 1 below, taking as examples that the effective focal length f of the optical lens 100 is 4.04mm, the aperture value FNO of the optical lens 100 is 1.87, the field angle FOV of the optical lens 100 is 101 °, the total length TTL of the optical lens 100 is 6.4mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 4.813 mm. 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 1 and 2 correspond to the object side surface and the image side surface of the first lens L1, respectively. The radius Y in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance from the stop 102 to the object-side surface of the third lens element L3 on the optical axis O. It is understood that the units of the radius Y, thickness and focal length in table 1 are mm, and the refractive index and dispersion coefficient in table 1 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

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

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis O direction; c is the curvature at the optical axis O of the aspheric surface, c ═ 1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conic coefficient; ai is 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 that can be used for each aspherical mirror in example one.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 470nm, 510nm, 555nm, 610nm and 650 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a diagram of astigmatism of light of the optical lens 100 at a wavelength of 555nm according to the first embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent a meridional image plane 101 curvature T and a sagittal image plane 101 curvature S, and as can be seen from (B) in fig. 2, astigmatism of the optical lens 100 is well compensated at this wavelength.

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

Example two

As shown in fig. 3, the optical lens 100 according to the second embodiment of the present invention includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f of the optical lens 100 as 4.6mm, the aperture value FNO of the optical lens 100 as 1.79, the field angle FOV of the optical lens 100 as 94 °, the total length TTL of the optical lens 100 as 7.3mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 as 4.813mm as examples, other parameters of the optical lens 100 are given in table 3 below, and the definitions of the parameters can be found from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, thickness and focal length in table 3 are mm, and the refractive index and dispersion coefficient in table 3 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the reference wavelength of 555 nm.

In the second embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through 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 embodiments, which is not described herein again. Table 4 below shows the high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical mirror surfaces in example two.

TABLE 3

TABLE 4

Referring to fig. 4, as can be seen from the light spherical aberration diagram (a) in fig. 4, the light astigmatism diagram (B) in fig. 4, and the distortion diagram (C) in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), the contents described in fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and the details are not repeated herein.

EXAMPLE III

As shown in fig. 5, the optical lens 100 according to the third embodiment of the present invention includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f of the optical lens 100 as 4.04mm, the aperture value FNO of the optical lens 100 as 1.87, the field angle FOV of the optical lens 100 as 100 °, the total length TTL of the optical lens 100 as 6.4mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 as 4.813mm as examples, other parameters of the optical lens 100 are given in table 5 below, and definitions of the parameters can be found from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, thickness and focal length in table 5 are mm, and the refractive index and dispersion coefficient in table 5 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the reference wavelength of 555 nm.

In the third embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through 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 embodiments, which is not described herein again. Table 6 below shows the high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in example three.

TABLE 5

TABLE 6

Referring to fig. 6, as can be seen from the light spherical aberration diagram (a) in fig. 6, the light astigmatism diagram (B) in fig. 6, and the distortion diagram (C) in fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (C), the contents described in fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and the details are not repeated herein.

Example four

As shown in fig. 7, a schematic structural diagram of an optical lens 100 according to fourth embodiment of the present invention is that the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an optical filter 10, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length f of the optical lens 100 as 4.22mm, the aperture value FNO of the optical lens 100 as 1.86, the field angle FOV of the optical lens 100 as 98.6 °, the total length TTL of the optical lens 100 as 6.63mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 as 4.813mm as examples, other parameters of the optical lens 100 are given in table 7 below, and definitions of the parameters can be found from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm, and the refractive index and dispersion coefficient in table 7 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the fourth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through 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 embodiments, which is not described herein again. Table 8 below gives the high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical mirror surfaces in example four.

TABLE 7

TABLE 8

Referring to fig. 8, as can be seen from the light spherical aberration diagram (a) in fig. 8, the light astigmatism diagram (B) in fig. 8, and the distortion diagram (C) in fig. 8, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 8 (a), fig. 8 (B), and fig. 8 (C), the contents described in fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and details are not repeated here.

EXAMPLE five

As shown in fig. 9, the optical lens 100 according to the fifth embodiment of the present invention includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an optical filter 10, which are sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length f of the optical lens 100 as 3.88mm, the aperture value FNO of the optical lens 100 as 1.9, the field angle FOV of the optical lens 100 as 104 °, the total length TTL of the optical lens 100 as 6mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 as 4.813mm as examples, other parameters of the optical lens 100 are given in table 9 below, and the definitions of the parameters can be derived from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm, and the refractive index and dispersion coefficient in table 9 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

In the fifth embodiment, the object-side 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 in the foregoing embodiments, which is not described herein again. The high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 for each of the aspherical mirror surfaces in example five are given in table 10 below.

TABLE 9

Watch 10

Referring to fig. 10, as can be seen from the light spherical aberration diagram (a) in fig. 10, the light astigmatism diagram (B) in fig. 10, and the distortion diagram (C) in fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 10 (a), fig. 10 (B), and fig. 10 (C), the contents described in fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and the details are not repeated herein.

Referring to table 11, table 11 is a summary of ratios of the relations in the first to fifth embodiments of the present invention.

TABLE 11

Relation/embodiment	Example one	Example two	EXAMPLE III	Example four	EXAMPLE five
						0.15mm<TTL/(ImgH*2)/f<0.2mm	0.165mm	0.165mm	0.165mm	0.163mm	0.161mm
1<ImgH/f	1.191	1.046	1.191	1.141	1.240
						8<\|f8\|/\|SAG81\|<20	13.897	9.145	9.306	10.828	19.421
9<\|f8\|/\|SAG82\|<15	12.401	11.737	12.443	13.521	12.804
						\|SAG11/SAG82\|<0.5	0.361	0.458	0.364	0.382	0.333
1<(\|SAG81\|+SAG82)/CT8<2	1.547	1.536	1.723	1.676	1.904
						5<\|f7/SAG72\|<7	5.691	5.373	5.629	6.276	5.952
0<Yc82/SD82<0.5	0.427	0.447	0.400	0.411	0.415
						n1-n8>0.04	0.044	0.044	0.044	0.044	0.044

In a second aspect, referring to fig. 11, the present invention further discloses a camera module 200, where the camera module 200 includes an image sensor 201 and the optical lens 100 according to any one of the first to fifth embodiments, the image sensor 201 is disposed at an image side of the optical lens 100, and the image sensor 201 is configured to convert an optical signal corresponding to a subject into an image signal, which is not described herein again. It can be understood that the camera module 200 having the optical lens 100 can not only meet the overall design requirements of miniaturization and wide view, but also improve the imaging quality of the camera module 200.

In a third aspect, referring to fig. 12, the present invention further discloses an electronic apparatus 300, where the electronic apparatus 300 includes a housing and the camera module 200 as described above, and the camera module 200 is disposed in the housing. Not only can the overall miniaturization and wide-view design requirements of the electronic equipment 300 be realized, but also the imaging quality of the electronic equipment 300 can be improved.

The optical lens, the camera module and the electronic device disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the optical lens, the camera module and the electronic device and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

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

the optical lens satisfies the following relation:

0.15mm<TTL/(ImgH*2)/f<0.2mm；

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

3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 8< | f8|/| SAG81| < 20;

wherein f8 is the focal length of the eighth lens and SAG81 is the maximum sagittal height of the object side of the eighth lens.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 9< | f8|/| SAG82| < 15;

wherein f8 is the focal length of the eighth lens and SAG82 is the maximum sagittal height on the image side of the eighth lens.

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: i SAG11/SAG 82I < 0.5;

wherein SAG11 is the maximum sagittal height of the object side of the first lens and SAG82 is the maximum sagittal height of the image side of the eighth lens.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1< (| SAG81| + SAG82)/CT8< 2;

wherein SAG81 is the maximum sagittal height of the object side surface of the eighth lens, SAG82 is the maximum sagittal height of the image side surface of the eighth lens, and CT8 is the thickness of the eighth lens on the optical axis.

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 5< | f7/SAG72| < 7;

wherein f7 is a focal length of the seventh lens, and SAG72 is a maximum sagittal height of an image side surface of the seventh lens.

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0< Yc82/SD82< 0.5;

yc82 is a vertical distance between a tangent plane of the image-side surface of the eighth lens element at the off-axis position, the tangent point being perpendicular to the optical axis, and the tangent point being at the image-side surface of the eighth lens element, and the optical axis, and SD82 is a maximum effective half aperture of the image-side surface of the eighth lens element.

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