CN114721126A

CN114721126A - Optical lens, camera module and electronic equipment

Info

Publication number: CN114721126A
Application number: CN202210392340.8A
Authority: CN
Inventors: 朱童林; 龙鑫灿; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2022-04-13
Filing date: 2022-04-13
Publication date: 2022-07-08
Anticipated expiration: 2042-04-13
Also published as: CN114721126B

Abstract

The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis; the first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with refractive power, the fourth lens element with refractive power, the fifth lens element with positive refractive power, the sixth lens element with refractive power, the seventh lens element with negative refractive power, and the optical lens system satisfy the following relationships: 1.4< TTL/SD72<1.6, where TTL is the distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical lens, and SD72 is half of the maximum effective aperture of the image-side surface of the seventh lens element. The optical lens, the camera module and the electronic equipment provided by the invention can ensure high resolution and high imaging quality and realize light and thin miniaturization design.

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 continuous development of the camera technology, the camera becomes a standard function of the electronic device, however, with the refinement of the semiconductor process technology, the pixel size of the photosensitive chip is gradually reduced, so that the size of the optical lens can be correspondingly reduced, meanwhile, the optical lens is also gradually developed in the higher pixel field, and the requirement on the imaging quality is also increased day by day, that is, with the continuous development of the camera technology, not only the optical lens is required to be more light and thin and miniaturized, but also the higher imaging quality is achieved. Therefore, how to ensure high resolution and high imaging quality and to make an optical lens light, thin and small is an urgent technical problem to be solved.

Disclosure of Invention

The invention provides an optical lens, a camera module and an electronic device, which can ensure high resolution and high imaging quality and realize light and thin miniaturization design.

In order to achieve the above objects, a first aspect of the present invention discloses an optical lens assembly, which includes seven lens elements with refractive power, sequentially arranged 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 paraxial region;

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

the fifth lens element with positive refractive power has a convex image-side surface at a paraxial region;

the sixth lens element with refractive power;

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

the optical lens satisfies the following relation:

1.4<TTL/SD72<1.6；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical lens system, i.e., an optical total length, and SD72 is a half of a maximum effective aperture of an image-side surface of the seventh lens element.

In the optical lens provided by the application, the first lens has stronger positive refractive power, and is matched with the surface type of the object side surface protruding from the optical axis, so that the light is favorably converged, and the light, the weight and the miniaturization of the optical lens are realized; the second lens has negative refractive power, and can well correct the huge aberration of the first lens towards the positive direction; the second lens, the third lens and the fourth lens are all in a surface shape with an object side surface protruding at a paraxial region and an image side surface recessed at the paraxial region, so that incident light can smoothly enter the optical lens, the off-axis aberration can be well corrected, good surface shape matching degree can be kept, and the optical total length of the optical lens can be further shortened; the fifth lens element has a convex surface shape with positive refractive power matched with the image side surface at the paraxial region, which is beneficial for smooth transition of marginal rays to the sixth lens element, and the maximum effective diameter of the image side surface of the fifth lens element has a proper inclination angle, so that the marginal rays can be ensured to have a smaller ray deflection angle, and stray light is avoided; the seventh lens with negative refractive power can correct the aberration generated by the first lens to the sixth lens, so that the aberration balance of the optical lens is promoted, and the resolving power of the optical lens is further improved, thereby improving the imaging quality of the optical lens, and the object side surface and the image side surface are both concave surfaces at the position of a paraxial region, so that the light divergence is facilitated, the emergence angle of marginal light is reasonably improved, the image height of the optical lens is facilitated to be improved so as to match with a large-size photosensitive chip, and high-pixel imaging is realized.

That is to say, by selecting a proper number of lenses and reasonably configuring the refractive power and the surface shape of each lens, the optical lens can be ensured to have good surface shape matching degree to realize light weight and small size, and meanwhile, the size of an imaging surface of the optical lens can be increased, so that the optical lens has the characteristic of a large image surface, the painting texture of the optical lens is improved, the resolution and the imaging definition of the optical lens are improved, the optical lens has a better imaging effect, and the high-definition imaging requirement of people on the optical lens is met; and further causing the optical lens to satisfy the following relational expression: when the optical total length of the optical lens and a half of the maximum effective aperture of the image side surface of the seventh lens are reasonably configured when TTL/SD72 is less than 1.4 and the optical lens has a smaller optical total length, the image side end has a larger light exit aperture to reduce the incident angle of the principal ray, so that high imaging quality is realized. When the maximum effective aperture of the image side surface of the seventh lens exceeds the upper limit of the relational expression, the maximum effective aperture is too small, the emergent angle of the main light ray of the marginal field of view is easily too large when the maximum effective aperture is matched with a large-size photosensitive chip, the marginal relative illumination of an imaging surface is too low, and a dark angle is easily generated; and the lower limit of the relation is lower, the total optical length of the optical lens is too small, the lens arrangement is compact, the design difficulty is high, and the manufacturability is poor.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2< f67/(R71-R72) < 0.8; wherein f67 is a combined focal length of the sixth lens and the seventh lens, R71 is a radius of curvature of an object-side surface of the seventh lens at an optical axis, and R72 is a radius of curvature of an image-side surface of the seventh lens at the optical axis. When the limitation of the relational expression is satisfied, the combined focal length of the sixth lens and the seventh lens and the curvature radius of the object side surface and the image side surface of the seventh lens on the optical axis are limited, so that the aberration contribution amounts of the sixth lens and the seventh lens can be controlled to balance the aberrations generated by the first lens to the sixth lens, and the aberration of the optical lens is in a reasonable range.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2.8mm < IMGH/FNO <3 mm; the IMGH is half of the maximum field angle corresponding image height of the optical lens, and the FNO is the f-number of the optical lens. The image height and the diaphragm number of the optical lens are reasonably configured to ensure that the optical lens has enough image height to match with a large-size photosensitive chip, and the design requirements of high pixel and high resolution can be met; meanwhile, the optical lens has the characteristic of a large aperture, the optical lens is ensured to have a large light-transmitting aperture, a sufficient effective light-entering amount can be obtained, sufficient luminous flux can be provided under the environment with weak light, and the shooting effect is further improved. When the optical aberration exceeds the upper limit of the relational expression, the f-number is too small, the effective light-passing aperture of the optical lens is too large, the light rays in the marginal field of view are difficult to be effectively adjusted, and the aberration of the optical lens is not easy to correct; and when the image height of the optical lens is lower than the lower limit of the relational expression, the image height of the optical lens is insufficient, and the large-size photosensitive chip is difficult to match so as to realize high-pixel imaging.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.1< (CT5+ CT6+ CT7)/(CT56+ CT67) < 1.7; wherein, CT5 is a thickness of the fifth lens element on the optical axis, CT6 is a thickness of the sixth lens element on the optical axis, CT7 is a thickness of the seventh lens element on the optical axis, CT56 is a distance from the image-side surface of the fifth lens element to the object-side surface of the sixth lens element on the optical axis, and CT67 is a distance from the image-side surface of the sixth lens element to the object-side surface of the seventh lens element on the optical axis. Satisfying the above relation, the thickness of the rear lens group (the rear lens group includes the fifth lens, the sixth lens and the seventh lens) of the optical lens and the distance between the lenses are reasonably configured, the total optical length can be effectively shortened, the volume of the optical lens can be reduced, and the processing and the assembly of the lenses of the rear lens group are facilitated. The distance between the lenses of the rear lens group is too small and the assembly difficulty is high when the upper limit of the relation is exceeded; being lower than the lower limit of the relational expression, the thickness of the lens of the rear lens group on the optical axis is too small, which easily causes the thickness of the lens in the rear lens group on the optical axis to be too small, thus the production and processing requirements can not be met, and the forming yield is difficult to ensure.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1< (ET6+ ET7)/ET67< 2; ET6 is an edge thickness of the sixth lens, that is, a thickness from an effective diameter edge of an object-side surface of the sixth lens to an effective diameter edge of an image-side surface of the sixth lens in a direction parallel to the optical axis, ET7 is an edge thickness of the seventh lens, that is, a thickness from an effective diameter edge of an object-side surface of the seventh lens to an effective diameter edge of an image-side surface of the seventh lens in a direction parallel to the optical axis, and ET67 is a distance from a maximum effective aperture of the image-side surface of the sixth lens to a maximum effective aperture of the object-side surface of the seventh lens in a direction parallel to the optical axis, that is, an edge distance between the sixth lens and the seventh lens. The edge thickness of the sixth lens, the edge thickness of the seventh lens and the edge distance between the sixth lens and the seventh lens are reasonably controlled, the processing of the sixth lens and the seventh lens is facilitated, meanwhile, the reasonable interval between the edges of the sixth lens and the seventh lens can be guaranteed, further, the incident angle of the chief ray of the edge field of view cannot be too large, and the assembly sensitivity of the optical lens is reduced. Exceeding the upper limit of the relational expression, the edge thickness of the sixth lens and/or the seventh lens is too large, which is not beneficial to maintaining the proper thickness ratio of the sixth lens and the seventh lens and increasing the processing difficulty of the sixth lens and the seventh lens; and the distance between the edges of the sixth lens and the seventh lens is too large, so that the incidence angle of the chief ray of the marginal field of view is reduced, the image height of the optical lens is not favorably improved, the optical lens is difficult to be matched with a large-size photosensitive chip, and the imaging quality is reduced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 5.9< CTAL/(CTmax-CTmin) < 8.1; wherein CTAL is a sum of thicknesses of the first lens element to the seventh lens element on the optical axis, CTmax is a maximum value of thicknesses of the first lens element to the seventh lens element on the optical axis, and CTmin is a minimum value of thicknesses of the first lens element to the seventh lens element on the optical axis. The thicknesses of all the lenses on the optical axis can be reasonably configured to facilitate injection molding and assembly of all the lenses, and meanwhile, the convergence of effective light rays and the improvement of aberration are facilitated, the distortion of the optical lens is reduced, and the whole optical lens can effectively expand the field angle and maintain good imaging quality.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2.9< | (f12+ f45)/f67| < 4.4; wherein f12 is a combined focal length of the first lens and the second lens, f45 is a combined focal length of the fourth lens and the fifth lens, and f67 is a combined focal length of the sixth lens and the seventh lens. The combined focal length of the first lens, the second lens, the fourth lens, the fifth lens and the sixth lens to the seventh lens can be reasonably constrained, on one hand, the surface type design of the first lens, the second lens, the fourth lens and the fifth lens can be matched to reasonably guide the light rays incident at a large angle, and the optical lens can be prevented from generating overlarge distortion and astigmatism; meanwhile, reasonable surface shape change and refractive power distribution of the sixth lens element to the seventh lens element are matched, so that reasonable aberration compensation is provided for the optical lens, the assembly sensitivity of the optical lens is reduced, and the imaging quality is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.8< SD61/SD62< 0.95; wherein SD61 is half of the maximum effective aperture of the object-side surface of the sixth lens element, and SD62 is half of the maximum effective aperture of the image-side surface of the sixth lens element. The method satisfies the relational expression, effectively reduces the aberration on the sixth lens structure, maintains the smooth trend of the edge light, and can reduce the aberration of the optical lens. When the effective aperture of the object-side surface and the effective aperture of the image-side surface of the sixth lens element are close to each other, the refractive power of the sixth lens element to the effective light is too weak, which is not beneficial to increasing the image height of the optical lens; the lower limit of the relational expression is lower, the structural offset of the sixth lens is too large, on one hand, the processing difficulty of the sixth lens is increased, and on the other hand, the marginal field light deflection angle of the optical lens is too large, the assembly sensitivity is high, the distortion is easy to generate, and the imaging quality is low.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2< (SAG61+ SAG62)/SAG61< 2.4; wherein SAG61 is the saggital height of the object side surface of the sixth lens at the maximum effective aperture and SAG62 is the saggital height of the image side surface of the sixth lens at the maximum effective aperture. The object side surface and the image side surface of the sixth lens have small rise difference at the maximum effective aperture position so that the bending degree of the surface type is close to the bending degree of the surface type, and the sixth lens is favorably processed and molded. When the height of the image side surface of the sixth lens at the maximum effective aperture exceeds the upper limit of the relational expression, the sixth lens is easy to bend too much, and the processing difficulty is high; when the height of the object side surface of the sixth lens is lower than the lower limit of the relational expression, the rise of the object side surface at the maximum effective aperture is too large, most edge light rays emitted from the image side surface of the fifth lens are difficult to enter the sixth lens, so that the edge relative illumination of an imaging surface is small, and the dark angle risk is large.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.1< | R61/R62| < 0.8; wherein R61 is a radius of curvature of an object-side surface of the sixth lens element at an optical axis, and R62 is a radius of curvature of an image-side surface of the sixth lens element at the optical axis. The structural shapes of the object-side surface and the image-side surface of the sixth lens element at the paraxial region are well configured to satisfy the above relational expression, which is beneficial to correcting aberrations such as astigmatism and distortion, and the shape of the sixth lens element is difficult to form in the process. When the maximum value of the relation is exceeded or the minimum value of the relation is lower, the shape of the sixth lens is relatively curved and difficult to form, and meanwhile, an included angle between a chief ray and the photosensitive chip is too large, so that the response efficiency of the photosensitive chip is reduced, and the image resolving power of the optical lens is influenced.

In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, wherein the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can ensure high resolution and high imaging quality and realize the light, thin and small design of the camera module.

In a third aspect, the invention further discloses an electronic device, which includes a housing and the camera module set according to the second aspect, and the camera module set is disposed on the housing. The electronic equipment with the camera module can ensure high resolution and high imaging quality and realize the light, thin and small design 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 equipment provided by the embodiment of the invention, the optical lens adopts seven lens elements, and the refractive power and the surface shape of each lens element are reasonably configured by selecting a proper number of lens elements, so that the optical lens can be ensured to have good surface shape matching degree to realize light weight and miniaturization, and the size of an imaging surface of the optical lens can be increased, so that the optical lens has the characteristic of a large image surface, the painting texture of the optical lens is improved, the resolution and the imaging definition of the optical lens are improved, the optical lens has a better imaging effect, and the high-definition imaging requirement of people on the optical lens is met; and further causing the optical lens to satisfy the following relational expression: : when the optical total length of the optical lens and a half of the maximum effective aperture of the image side surface of the seventh lens are reasonably configured when TTL/SD72 is less than 1.4, the optical lens has a smaller optical total length, and the image side end has a larger light-emitting aperture to match with a large-size photosensitive chip, so that high imaging quality is realized.

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 the 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 invention;

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 orientations or positional relationships based on the orientations or positional relationships 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 embodiments and the accompanying drawings.

Referring to fig. 1, the present application provides an optical lens system 100, which includes seven lens elements with refractive power, and 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 and a seventh lens element L7 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 and the seventh lens L7 in sequence from the object side of the first lens L1, and finally form an image on the imaging surface IMG of the optical lens 100. The first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 and the fourth lens element L4 both have positive refractive power or negative refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has positive refractive power or negative refractive power, and the seventh lens element L7 has negative refractive power.

Further, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 of the first lens element L1 is convex or concave at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 of the third lens element L3 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 can be convex or concave at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 may be convex or concave at the paraxial region; the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are both concave at the paraxial region.

In the optical lens 100 provided by the present application, the first lens element L1 has a strong positive refractive power, and is matched with a convex surface shape of the object side surface at the optical axis, which is beneficial to converging light, so as to realize the light weight and miniaturization of the optical lens 100; the second lens element L2 with negative refractive power can correct the large aberration of the first lens element L1 in the positive direction; the second lens element L2, the third lens element L3, and the fourth lens element L4 all adopt a surface shape in which the object-side surface is convex at the paraxial region and the image-side surface is concave at the paraxial region, which is beneficial for the incident light to smoothly enter the optical lens, and is beneficial for maintaining good surface shape matching degree and further shortening the optical total length of the optical lens 100 while well correcting the off-axis aberration; the fifth lens element L5 has a convex surface shape with positive refractive power and image-side surface at the paraxial region, which is favorable for smooth transition of marginal rays to the sixth lens element L6, and the maximum effective diameter of the image-side surface S10 of the fifth lens element L5 has a proper inclination angle, so that the marginal rays can have a small ray deflection angle, and stray light is avoided; the seventh lens element L7 with negative refractive power can correct aberrations generated by the first lens element L1 to the sixth lens element L6, thereby promoting aberration balance of the optical lens element 100, and further improving the resolving power of the optical lens element 100, so as to improve the imaging quality of the optical lens element 100, and the object-side surface and the image-side surface are both concave at the paraxial region, which is beneficial to light divergence, reasonably improving the exit angle of marginal light, and is beneficial to improving the image height of the optical lens element 100 to match with a large-sized photo-sensitive chip, thereby realizing high-pixel imaging, and in addition, the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region to ensure that the optical system 100 has reasonable back focus.

In some embodiments, each lens in the optical lens 100 may be made of glass or plastic. The use of plastic lenses can reduce the weight of the optical lens 100 and reduce the production cost. The glass lens enables the optical lens 100 to have excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical lens 100 may also be any combination of glass and plastic, and is not necessarily all glass or all plastic. Meanwhile, the object-side surface and the image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are aspheric. The adoption of the aspheric surface structure can improve the flexibility of lens design, effectively correct spherical aberration and improve imaging quality. In other embodiments, the object-side surface and the image-side surface of each lens of the optical lens 100 may be spherical. It should be noted that the above embodiments are only examples of some embodiments of the present application, and in some embodiments, the object side surface and the image side surface of each lens in the optical lens 100 may be aspheric or any combination of spherical surfaces.

It should be noted that the first lens L1 does not mean that there is only one lens, and in some embodiments, there may be two or more lenses in the first lens L1, and the two or more lenses can form a cemented lens, and a surface of the cemented lens closest to the object side can be regarded as the object side surface S1, and a surface of the cemented lens closest to the image side can be regarded as the image side surface S2. Alternatively, although no cemented lens is formed between the lenses of the first lens L1, the distance between the lenses is relatively fixed, and in this case, the object-side surface of the lens closest to the object side is the object-side surface S1, and the image-side surface of the lens closest to the image side is the image-side surface S2. In addition, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 or the seventh lens L7 in some embodiments may also be greater than or equal to two, and a cemented lens may be formed between any two adjacent lenses, and may also be a non-cemented lens.

In some embodiments, the optical lens 100 further includes a stop STO, which may be an aperture stop or a field stop, which may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1. It is understood that in other embodiments, the stop STO may also be disposed between two adjacent lenses (for example, between the second lens L2 and the third lens L3), and the setting may be adjusted according to the actual situation, which is not limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter L8, and the filter L8 may be an infrared cut filter or an infrared band pass filter, where the infrared cut filter is used to filter infrared light and the infrared band pass filter only allows infrared light to pass through. In the present application, the filter L8 is an ir-cut filter, disposed between the image side of the seventh lens element L7 and the imaging plane IMG, and fixed relative to each lens element in the optical lens system 100, for preventing infrared light from reaching the imaging plane IMG of the optical lens system 100 and interfering with normal imaging. The filter L8 may be assembled with each lens as a part of the optical lens 100, in other embodiments, the filter L8 may be an element independent from the optical lens 100, and the filter L8 may be installed between the optical lens 100 and the photo sensor chip when the optical lens 100 is assembled with the photo sensor chip. It is understood that the optical filter L8 may be made of an optical glass coating film, a colored glass, or a filter made of other materials, which may be selected according to actual needs, and is not limited in this embodiment. In other embodiments, a filter coating may be disposed on at least one of the first lens L1 through the seventh lens L7 to filter infrared light.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.4< TTL/SD72< 1.6; wherein, TTL is an optical axis distance from the object-side surface S1 of the first lens element L1 to the image plane IMG of the optical lens system, i.e., an optical total length, and SD72 is half of a maximum effective aperture of the image-side surface S14 of the seventh lens element L7. Specifically, TTL/SD72 may be 1.41, 1.46, 1.51, 1.55, 1.59, or the like.

By reasonably configuring the total optical length of the optical lens and half of the maximum effective aperture of the image-side surface S14 of the seventh lens L7, the optical lens 100 has a smaller total optical length, and the image-side end has a larger light exit aperture to reduce the incident angle of the chief ray, thereby achieving high imaging quality. When the maximum effective aperture of the image side surface S14 of the seventh lens L7 is too small, the maximum effective aperture is too small, the emergent angle of the main ray of the marginal field of view is too large when the maximum effective aperture is matched with a large-size photosensitive chip, the marginal relative illumination of the imaging surface IMG is too low, and a dark angle is easy to appear; below the lower limit of the relational expression, the total optical length of the optical lens 100 is too small, the lens arrangement is compact, the design difficulty is large, and the manufacturability is poor.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< f67/(R71-R72) < 0.8; wherein f67 is a combined focal length of the sixth lens L6 and the seventh lens L7, R71 is a radius of curvature of the object-side surface S13 of the seventh lens L7 at the optical axis, and R72 is a radius of curvature of the image-side surface S14 of the seventh lens L7 at the optical axis. Specifically, f67/(R71-R72) may be 0.21, 0.36, 0.51, 0.65, 0.79, or the like.

When the limitations of the above relational expressions are satisfied, by combining the focal length of the sixth lens L6 and the seventh lens L7 and defining the curvature radius of the object-side surface S13 and the curvature radius of the image-side surface S14 of the seventh lens L7 on the optical axis, the aberration contributions of the sixth lens and the seventh lens can be controlled so as to balance the aberrations generated by the first lens L1 to the sixth lens L6, and the aberration of the optical lens 100 can be within a reasonable range.

In some embodiments, the optical lens 100 satisfies the following relationship: 2.8mm < IMGH/FNO <3 mm; the IMGH is a half of the maximum field angle of the optical lens 100 corresponding to the image height, and the FNO is an f-number of the optical lens 100. Specifically, IMGH/FNO may be 2.81mm, 2.86mm, 2.91mm, 2.95mm, 2.99mm, or the like.

The relation is satisfied, the image height and the diaphragm number of the optical lens 100 are reasonably configured, so that the optical lens 100 has a large enough image height to match with a large-size photosensitive chip, and the design requirements of high pixel and high resolution can be met; meanwhile, the optical lens 100 has the characteristic of a large aperture, so that the optical lens 100 is ensured to have a large light-passing aperture, a sufficient effective light-entering amount can be obtained, and sufficient luminous flux can be provided under the environment with weak light, thereby improving the shooting effect. When the optical axis exceeds the upper limit of the relational expression, the f-number is too small, the effective light-passing aperture of the optical lens 100 is too large, and effective adjustment on light rays of the marginal field of view is difficult to form, so that the aberration of the optical lens 100 is not corrected favorably; below the lower limit of the relation, the image height of the optical lens 100 is insufficient, and it is difficult to match a large-sized photo sensor chip to realize high-pixel imaging.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.1< (CT5+ CT6+ CT7)/(CT56+ CT67) < 1.7; wherein, CT5 is a thickness of the fifth lens element L5 on an optical axis O, CT6 is a thickness of the sixth lens element L6 on the optical axis O, CT7 is a thickness of the seventh lens element L7 on the optical axis O, CT56 is a distance between an image-side surface S10 of the fifth lens element L5 and an object-side surface S11 of the sixth lens element L6 on the optical axis O, and CT67 is a distance between the image-side surface S12 of the sixth lens element L6 and the object-side surface S13 of the seventh lens element L7 on the optical axis O. Specifically, (CT5+ CT6+ CT7)/(CT56+ CT67) may be 1.11, 1.26, 1.41, 1.55, 1.69, or the like.

Satisfying the above relation, the thickness of the rear lens group (the rear lens group includes the fifth lens L5, the sixth lens L6, and the seventh lens L7) of the optical lens 100 and the distance between the lenses are reasonably configured, the optical total length can be effectively shortened, the volume of the optical lens can be reduced, and simultaneously, the processing and the assembly of the lenses of the rear lens group are facilitated. The distance between the rear lens groups is too small and the assembly difficulty is high when the upper limit of the relation is exceeded; being lower than the lower limit of the relational expression, the thickness of the lens in the rear lens group on the optical axis is too small, which easily causes the thickness of the lens in the rear lens group on the optical axis to be too small, thus the production and processing requirements can not be met, and the forming yield is difficult to ensure.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< (ET6+ ET7)/ET67< 2; ET6 is an edge thickness of the sixth lens, that is, a thickness from an effective diameter edge of an object-side surface of the sixth lens to an effective diameter edge of an image-side surface of the sixth lens in a direction parallel to the optical axis, ET7 is an edge thickness of the seventh lens, that is, a thickness from an effective diameter edge of an object-side surface of the seventh lens to an effective diameter edge of an image-side surface of the seventh lens in a direction parallel to the optical axis, and ET67 is a distance from a maximum effective aperture of the image-side surface of the sixth lens to a maximum effective aperture of the object-side surface of the seventh lens in a direction parallel to the optical axis, that is, an edge distance between the sixth lens and the seventh lens. Specifically, (ET6+ ET7)/ET67 may be 1.1, 1.3, 1.5, 1.7, 1.9, or the like.

Satisfying the above relation, reasonably controlling the edge thickness of the sixth lens L6, the edge thickness of the seventh lens L7, and the edge distance between the sixth lens L6 and the seventh lens L7 is beneficial to processing the sixth lens L6 and the seventh lens L7, and simultaneously, the reasonable distance between the edges of the sixth lens L6 and the seventh lens L7 can be ensured, so that the chief ray incident angle of the edge field of view is not too large, and the reduction of the assembly sensitivity of the optical lens 100 is beneficial. Exceeding the upper limit of the relational expression, the edge thickness of the sixth lens L6 and/or the seventh lens L7 is too large, which is not favorable for maintaining the proper thickness ratio of the sixth lens L6 and the seventh lens L7, and increases the processing difficulty of the sixth lens L6 and the seventh lens L7; below the lower limit of the relation, the edge distance between the sixth lens L6 and the seventh lens L7 is too large, which slows down the incident angle of the chief ray of the edge field of view, and is not favorable for the optical lens 100 to increase the image height, is difficult to match with a large-size photosensitive chip, and reduces the imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 5.9< CTAL/(CTmax-CTmin) < 8.1; wherein CTAL is a sum of thicknesses of the first lens L1 to the seventh lens L7 on the optical axis O, CTmax is a maximum of thicknesses of the first lens L1 to the seventh lens L7 on the optical axis O, and CTmin is a minimum of thicknesses of the first lens L1 to the seventh lens L7 on the optical axis O. Specifically, CTAL/(CTmax-CTmin) may be 5.91, 6.45, 7.01, 7.55, 8.09, or the like.

Satisfying the above relation, the thicknesses of all the lenses on the optical axis O can be reasonably configured, which is beneficial to the injection molding and assembly of each lens, and is beneficial to the convergence of effective light and the improvement of aberration, and the distortion of the optical lens 100 is reduced, so that the entire optical lens 100 can effectively expand the field angle and maintain good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 2.9< | (f12+ f45)/f67| < 4.4; wherein f12 is a combined focal length of the first lens L1 and the second lens L2, f45 is a combined focal length of the fourth lens L4 and the fifth lens L5, and f67 is a combined focal length of the sixth lens L6 and the seventh lens L7. Specifically, | (f12+ f45)/f67| may be 2.91, 3.28, 3.65, 4.02, 4.39, or the like.

The combined focal length of the first lens L1 and the second lens L2, the combined focal length of the fourth lens L4 and the fifth lens L5, and the combined focal length of the sixth lens L6 to the seventh lens L7 can be reasonably constrained, so that on one hand, the incident light rays with large angle can be reasonably guided by matching with the surface type designs of the first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5, and the optical lens 100 is prevented from generating too large distortion and astigmatism; meanwhile, the reasonable surface shape change and refractive power distribution of the sixth lens element L6 to the seventh lens element L7 are matched, so that the reasonable aberration compensation is favorably provided for the optical lens 100, and the reduction of the assembly sensitivity of the optical lens 100 and the improvement of the imaging quality are favorably realized.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8< SD61/SD62< 0.95; the SD61 is half of the maximum effective diameter of the object-side surface S11 of the sixth lens L6, and the SD62 is half of the maximum effective diameter of the image-side surface S12 of the sixth lens L6. Specifically, SD61/SD62 may be 0.81, 0.84, 0.88, 0.91, 0.94, or the like.

Satisfying the above relationship, the structural aberration of the sixth lens element L6 (i.e. the difference between the maximum effective aperture of the object-side surface of the sixth lens element and the maximum effective aperture of the image-side surface of the sixth lens element) is effectively reduced, the trend of smooth edge rays is maintained, and the aberration of the optical lens assembly 100 can be reduced. Beyond the upper limit of the relation, the effective apertures of the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are close to each other, and the refractive power of the sixth lens element L6 to the effective light is too weak to increase the image height of the optical lens element 100; being lower than the lower limit of the relational expression, the structural aberration of the sixth lens L6 is too large, which increases the processing difficulty of the sixth lens L6, and on the other hand, the marginal field of view ray deflection angle of the optical lens 100 is too large, the assembly sensitivity is large, distortion is easy to occur, and the imaging quality is low.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< (SAG61+ SAG62)/SAG61< 2.4; SAG61 is the rise of the object-side surface S11 of the sixth lens L6 at the maximum effective aperture, namely, the distance from the maximum aperture of the object-side surface S11 of the sixth lens L6 to the intersection point of the object-side surface S11 of the sixth lens L6 and the optical axis O in the optical axis direction; SAG62 is the rise of the image-side surface S12 of the sixth lens L6 in the sagittal direction at the maximum effective aperture, that is, the distance in the optical axis direction from the maximum aperture of the image-side surface S12 of the sixth lens L6 to the intersection point of the image-side surface S12 of the sixth lens L6 and the optical axis O. It is understood that, specifically, (SAG61+ SAG62)/SAG61 may be 2.01, 2.11, 2.21, 2.3, 2.39, or the like.

Satisfying the above relational expression, the height difference between the object-side surface S11 and the image-side surface S12 of the sixth lens L6 at the maximum effective aperture is not large, and therefore, the degree of curvature of the surface shape is close to that of the sixth lens L6, which is advantageous for the processing and molding of the sixth lens L6. Exceeding the upper limit of the relational expression, the rise of the image side surface S12 of the sixth lens L6 at the maximum effective aperture is too large, which easily causes the sixth lens L6 to be too curved, and the processing difficulty is large; below the lower limit of the relation, the rise of the object-side surface S11 of the sixth lens element L6 at the maximum effective aperture is too large, and most of the edge light rays emitted from the image-side surface S10 of the fifth lens element L5 are difficult to enter the sixth lens element L6, so that the IMG edge relative illuminance of the imaging surface is too small, and the risk of dark corners is large.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.1< | R61/R62| < 0.8; wherein R61 is a radius of curvature of the object-side surface S11 of the sixth lens element L6 at the optical axis, and R62 is a radius of curvature of the image-side surface S12 of the sixth lens element L6 at the optical axis. Specifically, | R61/R62| may be 0.11, 0.28, 0.45, 0.62, 0.79, or the like.

Satisfying the above relationship, the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 have good arrangement shapes at the paraxial region, which is favorable for correcting aberrations such as astigmatism and distortion, and the shape of the sixth lens element L6 is difficult to mold in terms of process. If the upper limit of the above relational expression is exceeded or the lower limit of the above relational expression is fallen below, the shape of the sixth lens element L6 is relatively curved, which is difficult to form, and at the same time, the included angle between the chief ray and the photosensitive chip is too large, which reduces the response efficiency of the photosensitive chip and affects the image resolving power of the optical lens 100.

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

First embodiment

As shown in fig. 1, fig. 1 is a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application, where the optical lens 100 includes a stop STO, 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 optical filter L8, which are sequentially disposed 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 negative refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has positive refractive power, and the seventh lens element L7 has negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above detailed description, and details are not repeated here.

Further, the object-side surface S1 of the first lens element L1 is convex in the paraxial region thereof, and the image-side surface S2 of the first lens element L1 is concave in the paraxial region thereof; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 of the third lens element L3 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S12 of the sixth lens element L6 is convex at the paraxial region; the object-side surface S13 of the seventh lens element L7 is concave at the paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region.

Specifically, other parameters of the optical lens 100 are given in table 1 below, taking as an example that the effective focal length f of the optical lens 100 is 5.85mm, half of the maximum field angle HFOV of the optical lens 100 is 41.69 °, the total optical length TTL of the optical lens 100 is 7mm, and the f-number FNO is 1.9. 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 as in the case of the surfaces 1 and 2, the object side surface S1 and the image side surface S2 of the first lens L1 correspond, 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. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop STO in the "thickness" parameter column is the distance from the stop STO to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O) on the optical axis O, the direction from the object side surface to the image side surface of the last lens of the first lens L1 is defined as the positive direction of the optical axis O, when the value is negative, it indicates that the stop STO is closer to the image plane IMG than the vertex of the next surface, and if the thickness of the stop STO is positive, the stop STO is closer to the object plane than the vertex indicated later. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. In table 1, the reference wavelength of the focal length of each lens is 555nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.56 nm.

TABLE 1

In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1 through the seventh lens L7 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 direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1 above); k is the cone coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2 shows the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18 and A20 which can be used for each of the aspherical mirrors S1 to S14 in the first embodiment.

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 450nm, 555nm and 660 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift in mm, 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 555 nm. Wherein the abscissa along the X-axis direction represents the focus offset in mm, and the ordinate along the Y-axis direction represents the image height in mm. T represents the bending of the imaging plane IMG in the meridional direction, and S represents the bending of the imaging plane IMG in the sagittal direction, and as can be seen from (B) in fig. 2, astigmatism of the optical lens 100 is well compensated for at the wavelength of 555 nm.

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 the wavelength of 555 nm.

Second embodiment

Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a stop STO, 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 a filter L8, which are disposed in order from the object side to the image side along the 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 negative refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has positive refractive power, and the seventh lens element L7 has negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above detailed description, and details are not repeated here.

Further, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 of the first lens element L1 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 of the third lens element L3 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S12 of the sixth lens element L6 is convex at the paraxial region; the object-side surface S13 of the seventh lens element L7 is concave at the paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region.

In the second embodiment, the effective focal length f of the optical lens 100 is 5.59mm, half of the maximum field angle HFOV of the optical lens 100 is 42.68 °, the total optical length TTL of the optical lens 100 is 6.9mm, and the f-number FNO is 1.88, for example.

Other parameters in the second embodiment are given in the following table 3, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 3 are all mm. And the reference wavelength of the effective focal length of each lens in table 3 is 555nm, and the reference wavelength of the refractive index and abbe number of each lens is 587.56 nm.

TABLE 3

In the second embodiment, table 4 gives the high-order term coefficients that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 4

Referring to fig. 4, fig. 4 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the second embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from (a) in fig. 4, the spherical aberration value of the optical lens 100 in the second embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better. As can be seen from (B) in fig. 4, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 4, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

Third embodiment

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes a stop STO, 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 a filter L8, which are provided in order from the object side to the image side along the 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 negative refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has negative refractive power, and the seventh lens element L7 has negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above detailed description, and details are not repeated here.

Further, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 of the first lens element L1 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 of the third lens element L3 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 of the sixth lens element L6 is concave at the paraxial region; the object-side surface S13 of the seventh lens element L7 is concave at the paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region.

In the third embodiment, the effective focal length f of the optical lens 100 is 5.65mm, half of the maximum field angle HFOV of the optical lens 100 is 42.33 °, the total optical length TTL of the optical lens 100 is 7.1mm, and the f-number FNO is 1.86, for example.

Other parameters in the third embodiment are shown in the following table 5, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 5 are mm. And the reference wavelength of the effective focal length of each lens in table 5 is 555nm, and the reference wavelength of the refractive index and abbe number of each lens is 587.56 nm.

TABLE 5

In the third embodiment, table 6 gives the high-order term coefficients that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 6, fig. 6 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the third embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from (a) in fig. 6, the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 6, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 6, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

Fourth embodiment

Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present disclosure. The optical lens 100 includes a stop STO, 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 a filter L8, which are disposed in order from the object side to the image side along the 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 negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has negative refractive power, and the seventh lens element L7 has negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above detailed description, and details are not repeated here.

Further, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 of the first lens element L1 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 of the third lens element L3 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 of the sixth lens element L6 is convex at the paraxial region; the object-side surface S13 of the seventh lens element L7 is concave at the paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region.

In the fourth embodiment, the focal length f of the optical lens 100 is 5.83mm, half of the maximum field angle HFOV of the optical lens 100 is 41.48 °, the total optical length TTL of the optical lens 100 is 7.3mm, and the f-number FNO is 1.84.

Other parameters in the fourth embodiment are shown in the following table 7, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. In table 7, the reference wavelength of the effective focal length of each lens is 555nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.56 nm.

TABLE 7

In the fourth embodiment, table 8 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 8

Referring to fig. 8, fig. 8 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the fourth embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from (a) in fig. 8, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 8, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 8, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

Fifth embodiment

Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. The optical lens 100 includes a stop STO, 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 a filter L8, which are disposed in order from the object side to the image side along the 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, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has negative refractive power, and the seventh lens element L7 has negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, reference may be made to the above detailed description, and details are not repeated here.

Further, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 of the first lens element L1 is convex at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 of the third lens element L3 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S12 of the sixth lens element L6 is convex at the paraxial region; the object-side surface S13 of the seventh lens element L7 is concave at the paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region.

In the fifth embodiment, the focal length f of the optical lens 100 is 5.91mm, half of the maximum field angle HFOV of the optical lens 100 is 41.19 °, the total optical length TTL of the optical lens 100 is 7.15mm, and the f-number FNO is 1.83.

The other parameters in the fifth embodiment are shown in the following table 9, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm. In table 9, the reference wavelength of the effective focal length of each lens is 555nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.56 nm.

TABLE 9

In the fifth embodiment, table 10 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

Watch 10

Referring to fig. 10, fig. 10 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens 100 according to a fifth embodiment, and specific definitions are described with reference to the first embodiment and will not be described herein again. As can be seen from (a) in fig. 10, the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 10, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 10, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

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

TABLE 11

Relation/embodiment	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment
						TTL/SD72	1.465	1.439	1.494	1.543	1.539
f67/(R71-R72)	0.706	0.756	0.279	0.258	0.355
						IMGH/FNO	2.871	2.872	2.904	2.947	2.964
(CT5+CT6+CT7)/(CT56+CT67)	1.209	1.170	1.457	1.689	1.557
						(ET6+ET7)/ET67	1.371	1.027	1.902	1.345	1.621
CTAL/(CTmax-CTmin)	6.004	5.995	6.250	8.079	7.093
						\|(f12+f45)/f67\|	3.286	2.923	4.336	3.471	3.240
SD61/SD62	0.845	0.896	0.901	0.934	0.860
						(SAG61+SAG62)/SAG61	2.196	2.328	2.051	2.380	2.294
\|R61/R62\|	0.396	0.533	0.160	0.443	0.713

As can be seen from table 11, the optical lenses 100 of the first to fifth embodiments all satisfy the following relations:

1.4<TTL/SD72<1.6；

0.2<f67/(R71-R72)<0.8；

2.8mm<IMGH/FNO<3mm；

1.1<(CT5+CT6+CT7)/(CT56+CT67)<1.7；

1<(ET6+ET7)/ET67<2；

5.9<CTAL/(CTmax-CTmin)<8.1；

2.9<|(f12+f45)/f67|<4.4；

0.8<SD61/SD62<0.95；

2<(SAG61+SAG62)/SAG61<2.4；

0.1<|R61/R62|<0.8。

referring to fig. 11, the present invention further discloses a camera module 200, which includes a photo sensor chip 201 and the optical lens 100 according to any of the first to fifth embodiments, wherein the photo sensor chip 201 is disposed on the image side of the optical lens 100, and a photo sensing surface of the photo sensor chip can be regarded as an image plane IMG of the optical lens 100. Specifically, the photosensitive chip may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device. By adopting the optical lens 100 in the camera module, the light and thin miniaturized design of the camera module can be realized while high resolution and high imaging quality are ensured.

Referring to fig. 12, the present invention further discloses an electronic device, in which the electronic device 300 includes a housing 301 and the camera module 200 according to the foregoing embodiment, and the camera module 200 is disposed on the housing 301. Specifically, the electronic apparatus 300 may be, but is not limited to, a wearable device such as a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted image capturing apparatus such as a car recorder, or a smart watch. When the electronic device 300 is a smartphone, the housing 301 may be a middle frame of the electronic device. Adopt above-mentioned module of making a video recording in electronic equipment, can guarantee high resolution, high formation of image quality simultaneously, realize electronic equipment's frivolous miniaturized design.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An optical lens system includes seven lens elements with refractive power, sequentially disposed from an object side to an image side along an optical axis;

the sixth lens element with refractive power;

the optical lens satisfies the following relational expression:

1.4<TTL/SD72<1.6；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical lens, and SD72 is a half of a maximum effective aperture of an image-side surface of the seventh lens element.

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

0.2<f67/(R71-R72)<0.8；

wherein f67 is a combined focal length of the sixth lens and the seventh lens, R71 is a radius of curvature of an object-side surface of the seventh lens at an optical axis, and R72 is a radius of curvature of an image-side surface of the seventh lens at the optical axis.

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

2.8mm<IMGH/FNO<3mm；

the IMGH is half of the maximum field angle corresponding image height of the optical lens, and the FNO is the f-number of the optical lens.

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

1.1<(CT5+CT6+CT7)/(CT56+CT67)<1.7；

wherein, CT5 is a thickness of the fifth lens element on the optical axis, CT6 is a thickness of the sixth lens element on the optical axis, CT7 is a thickness of the seventh lens element on the optical axis, CT56 is a distance from the image-side surface of the fifth lens element to the object-side surface of the sixth lens element on the optical axis, and CT67 is a distance from the image-side surface of the sixth lens element to the object-side surface of the seventh lens element on the optical axis.

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

1<(ET6+ET7)/ET67<2；

ET6 is the edge thickness of the sixth lens element, ET7 is the edge thickness of the seventh lens element, and ET67 is the distance from the maximum effective aperture of the image-side surface of the sixth lens element to the maximum effective aperture of the object-side surface of the seventh lens element in the direction parallel to the optical axis.

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

5.9<CTAL/(CTmax-CTmin)<8.1；

wherein CTAL is a sum of thicknesses of the first lens element to the seventh lens element on the optical axis, CTmax is a maximum value of thicknesses of the first lens element to the seventh lens element on the optical axis, and CTmin is a minimum value of thicknesses of the first lens element to the seventh lens element on the optical axis.

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

2<(SAG61+SAG62)/SAG61<2.4；

wherein SAG61 is the saggital height of the object side surface of the sixth lens at the maximum effective aperture and SAG62 is the saggital height of the image side surface of the sixth lens at the maximum effective aperture.

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

0.8< SD61/SD62< 0.95; and/or

2.9< | (f12+ f45)/f67| < 4.4; and/or

0.1<|R61/R62|<0.8；

SD61 is a half of the maximum effective aperture of the object-side surface of the sixth lens element, SD62 is a half of the maximum effective aperture of the image-side surface of the sixth lens element, f12 is the combined focal length of the first lens element and the second lens element, f45 is the combined focal length of the fourth lens element and the fifth lens element, f67 is the combined focal length of the sixth lens element and the seventh lens element, R61 is the radius of curvature of the object-side surface of the sixth lens element at the optical axis, and R62 is the radius of curvature of the image-side surface of the sixth lens element at the optical axis.

9. A camera module, comprising a photo sensor chip and the optical lens of any one of claims 1-8, wherein the photo sensor chip 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 in the housing.