CN114137690A

CN114137690A - Optical lens, camera module and electronic equipment

Info

Publication number: CN114137690A
Application number: CN202111179009.XA
Authority: CN
Inventors: 王国贵; 杨健; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-03-04
Anticipated expiration: 2041-10-09
Also published as: CN114137690B

Abstract

The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from an object side to an image side along an optical axis, the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, the sixth lens has negative refractive power, and the optical lens meets the following relational expression: f 43/ImgH is more than or equal to 45.5 and less than 61.0; wherein f is the effective focal length of the optical lens, and ImgH is the image height corresponding to the maximum field angle of the optical lens. The optical lens, the camera module and the electronic equipment provided by the invention can enable the optical lens to have a long focal length, meet the design requirement of miniaturization and improve the imaging quality.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

At present, with the development of a camera technology, the application of an optical lens to electronic devices such as a smart phone, a tablet computer, a video phone and the like is more and more extensive, for example, photographing, shooting or video call, and along with this, the requirements of a user on the volume and the imaging quality of the optical lens are also higher and higher, however, in the related technology, the optical lens cannot meet the design requirements of miniaturization and high imaging quality while having a long focal length.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the design requirement of miniaturization and improve the imaging quality while the optical lens has a long focal length.

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, and a sixth lens arranged in order from an object side to an image side along an optical axis;

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

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

the third lens element with positive refractive power;

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

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

the optical lens satisfies the following relation:

45.5≤f*43/ImgH＜61.0；

wherein f is the effective focal length of the optical lens, and ImgH is the diagonal length of the effective imaging area on the imaging surface of the optical lens.

The optical lens provided by the application comprises a first lens with positive refractive power and a second lens with negative refractive power, so that the spherical aberration of the optical lens on an optical axis can be corrected, the resolution can be improved, meanwhile, the object side surface of the first lens is a convex surface at a position close to the optical axis, the positive refractive power of the first lens can be enhanced, and the light converging capability of the first lens can be improved; the third lens element provides positive refractive power, the fourth lens element provides negative refractive power, and the combined structure of the third and fourth lens elements can counteract most of the distortion and coma generated by the front lens elements (i.e., the first and second lens elements); the image side surface of the fourth lens is concave at the paraxial region, so that the aberration correction capability of the optical lens can be optimized, and the imaging quality of the optical lens can be improved; the fifth lens element with positive refractive power can distribute refractive power of the whole optical lens, thereby facilitating dispersion of aberration and obtaining high resolution; the sixth lens element provides negative refractive power for the optical lens, which is beneficial to balancing the aberration which is difficult to correct and is generated when the incident light passes through the first lens element to the fifth lens element, thereby improving the imaging quality of the optical lens. Through the reasonable configuration of the refractive power and the surface type of the first lens, the sixth lens and the fourth lens, the miniaturization design of the optical lens is favorably realized, the imaging quality of the optical lens is improved, the optical lens has a long focal length, and a long-distance object can obtain a short-distance imaging effect.

In addition, the optical lens provided by the application satisfies the following relational expression: f 43/ImgH is more than or equal to 45.5 and less than 61.0, and when the relational expression is satisfied, the optical lens can be ensured to have a long-focus characteristic, and characteristics such as background blurring and long-distance shooting are realized. If the upper limit of the relational expression is exceeded, the telephoto performance of the optical lens can be further enhanced, but the total length of the optical lens is further increased, which is disadvantageous for the miniaturization of the optical lens. When the value is lower than the lower limit of the relational expression, the design requirement of the optical lens for the super-telephoto characteristic cannot be satisfied.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the image-side surface of the first lens and the object-side surface of the second lens are aspheric, and the image-side surface of the first lens and the object-side surface of the second lens are formed with diffractive optical structures.

The diffractive optical structures are formed on the object side surfaces of the first lens and the second lens, so that the aberration of the optical lens is reduced, the aberration is reduced to within 1um, curves of all wavebands of the vertical axis chromatic aberration are not crossed, and the Modulation Transfer Function (MTF) value is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: TTL/f is more than or equal to 0.77 and less than 1.0; wherein TTL is a distance from the object side surface of the first lens element to the image plane of the optical lens system, i.e., a total length of the optical lens system.

When the relation is satisfied, the total length of the optical lens is smaller than the effective focal length of the optical lens, which is beneficial to balancing the aberration such as chromatic aberration, spherical aberration and distortion when the optical lens is in telephoto, so that the optical lens can obtain good imaging quality, and simultaneously, the miniaturization design of the optical lens is also beneficial to being realized. When the optical lens meets the relation and f is greater than 6mm, the optical lens has a longer focal length, and the optical lens is favorable for realizing a telephoto function. And when the optical lens meets the above relational expression and TTL is less than 6.5mm, the optical lens is beneficial to realizing miniaturization design and can be assembled in a thinner camera module or electronic equipment.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 5deg/mm < FOV/f < 8.2 deg/mm; wherein the FOV is a maximum field angle of the optical lens.

When f is increased, the maximum field angle is reduced, so that when the relational expression is satisfied, the optical lens can obtain a larger field angle at a certain effective focal length, thereby simultaneously satisfying the design requirements of the optical lens on the long-focus performance and a wider shooting range.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.9 < (| R32| + | R42|)/f is less than or equal to 13.44; wherein R32 is a radius of curvature of the image-side surface of the third lens element at a paraxial region, and R42 is a radius of curvature of the image-side surface of the fourth lens element at a paraxial region.

The third lens element in the optical lens provides positive refractive power, the fourth lens element provides negative refractive power, the combined structure of the third lens element and the fourth lens element can counteract most of the distortion and coma generated by the front lens element (i.e. the first lens element and the second lens element), and by reasonably setting the curvature radii of the third lens element and the fourth lens element, the third lens element and the fourth lens element can be prevented from introducing larger spherical aberration and vertical chromatic aberration, thereby facilitating the reasonable distribution of primary aberration on each lens element and reducing tolerance sensitivity.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: R51/CT56 is more than or equal to 94.94 and less than 485; wherein R51 is a radius of curvature of an object-side surface of the fifth lens element at a paraxial region thereof, and CT56 is a distance between the fifth lens element and the sixth lens element on the optical axis.

The fifth lens element in the optical lens has positive refractive power, and the refractive power distribution of the entire optical lens is adjusted, so that the optical lens is favorable for dispersing aberration and obtaining high resolution. And the curvature of the object side surface of the fifth lens changes, so that the deflection angle of each field ray in the fifth lens can be reduced. In addition, the forming and assembling difficulty of the fifth lens can be reduced by reasonably setting the curvature radius of the object side surface of the fifth lens and the ratio of the distance between the fifth lens and the sixth lens on the optical axis.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1 < (CT1+ CT2+ CT3)/BF < 2.1; wherein CT1 is a thickness of the first lens element on the optical axis, CT2 is a thickness of the second lens element on the optical axis, CT3 is a thickness of the third lens element on the optical axis, and BF is a minimum distance from an image side surface of the sixth lens element to an image plane of the optical lens element in a direction parallel to the optical axis.

When the relation is satisfied, the optical lens can form a good matching relation with a photosensitive chip of the camera module when being applied to the camera module, and is more favorable for assembling the optical lens and other parts of the lens module. Simultaneously through the thickness and the interval between the three of reasonable setting first lens, second lens and third lens, promptly, the compact setting between first lens, second lens, the third lens can help reducing optical lens's total length, can reduce the aberration that first lens, second lens, third lens produced simultaneously, and then be favorable to reducing optical lens's the degree of difficulty of balancing the aberration.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2 < SAG61/CT6 < 2.9; wherein SAG61 is the distance in the optical axis direction from the maximum clear aperture of the object side surface of the sixth lens to the intersection of the sixth lens and the optical axis, i.e. the sagittal height of the object side surface of the sixth lens, and CT6 is the thickness of the sixth lens on the optical axis.

When the relational expression is satisfied, the surface shape of the object side surface of the sixth lens can be reasonably restrained, the edge light is ensured to have a good deflection angle, and aberration which is difficult to correct due to overlarge deflection is avoided; when the height of the object-side surface of the sixth lens exceeds the upper limit of the relational expression, the rise of the object-side surface of the sixth lens is too large, and the surface shape of the object-side surface of the sixth lens at the circumference is excessively bent, so that poor molding is caused, and the manufacturing yield is influenced; below the lower limit of the relation, the surface shape of the object-side surface of the sixth lens element at the circumference is too smooth, and the deflection capability of the light rays in the off-axis field of view is insufficient, which is not favorable for the correction of distortion and field curvature aberration.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 11 < (| f3| + | f4| + | f5|)/(CT34+ CT45+ CT56) < 20; wherein f3 is an effective focal length of the third lens element, f4 is an effective focal length of the fourth lens element, f5 is an effective focal length of the fifth lens element, CT34 is a distance between the third lens element and the fourth lens element on the optical axis, CT45 is a distance between the fourth lens element and the fifth lens element on the optical axis, and CT56 is a distance between the fifth lens element and the sixth lens element on the optical axis.

By reasonably configuring the refractive powers of the third lens element, the fourth lens element and the fifth lens element and the distances between the lens elements, the spherical aberration and the chromatic aberration generated by the front lens element (i.e., the first lens element and the second lens element) can be balanced, and the overall image quality of the optical lens assembly can be improved.

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 meet the requirements of light, thin and small design, improve the imaging quality of the camera module, enable the camera module to have a long focal length and enable a remote object to obtain a near-distance imaging effect.

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, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module can meet the requirements of light, thin and small design, improve the imaging quality of the electronic equipment, enable the electronic equipment to have a long focal length and enable a long-distance object to obtain a close-distance imaging effect.

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 comprises six lenses, and the size and the refractive power of each lens are reasonably configured, so that the optical lens meets the following relational expression: f 43/ImgH is less than 61.0 and not more than 45.5, so that the imaging quality of the optical lens is improved while the optical lens is miniaturized, the imaging quality of the optical lens is improved, the optical lens has a long-focus characteristic, a short-distance object can be imaged, and the characteristics of background blurring, long-distance shooting and the like are 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 facial sagittal view of the image side surface of the first lens element disclosed in the first embodiment of the present application;

FIG. 3 is a planar rise plot of the object-side surface of the second lens disclosed in the first embodiment of the present application;

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

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

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

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

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

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

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

fig. 11 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion graph (%);

fig. 13 is a schematic structural diagram of the camera module disclosed in the present application;

fig. 14 is a schematic structural diagram of an electronic device disclosed in the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be 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 orientation or positional relationship, for example, the term "up" may also be used to indicate some dependency 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 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 application, an optical lens 100 is disclosed, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 in sequence from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 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, and the sixth lens element L6 has negative refractive power.

Further, the object-side surface S1 of the first lens element L1 may be convex at the paraxial region O, the image-side surface S2 of the first lens element L1 may be concave at the paraxial region O, the object-side surface S3 of the second lens element L2 may be convex at the paraxial region O, the image-side surface S4 of the second lens element L2 may be concave at the paraxial region O, the object-side surface S5 of the third lens element L3 may be convex or concave at the paraxial region O, the image-side surface S6 of the third lens element L3 may be convex or concave at the paraxial region O, the object-side surface S7 of the fourth lens element L4 may be convex or concave at the paraxial region O, the image-side surface S8 of the fourth lens element L4 may be concave at the paraxial region O, the object-side surface S9 of the fifth lens element L5 may be concave at the paraxial region O, the image-side surface S10 of the fifth lens element L5 may be convex at the paraxial region O, the sixth image-side surface S8653 may be convex at the paraxial region O, and the object-side surface S8656 may be convex at the paraxial region O.

In the optical lens system provided by the present application, the first lens element L1 and the second lens element L2 respectively have positive refractive power and negative refractive power, which is beneficial to correcting spherical aberration of the optical lens system 100 on the optical axis O, and improves resolution, and meanwhile, the object-side surface S1 of the first lens element L1 is convex at a position close to the optical axis O, which is beneficial to enhancing the refractive power of the first lens element L1, and improving the light gathering capability of the first lens element L1. The combined structure of the third lens element L3 and the fourth lens element L4 can counteract most of the distortion and coma aberration caused by the front lens element (i.e., the first lens element L1 and the second lens element L2) when the third lens element L3 provides positive refractive power and the fourth lens element L4 provides positive refractive power. The image-side surface of the fourth lens element L4 is concave at the paraxial region O, so that the aberration correction capability of the optical lens 100 can be optimized, which is beneficial to improving the imaging quality of the optical lens 100; the fifth lens element L5 with positive refractive power adjusts the overall refractive power distribution of the optical lens system 100, which helps to disperse the aberration and achieve high resolution. The sixth lens element L6 provides negative refractive power for the optical lens 100, which is beneficial to balance the aberration of incident light generated by the first lens element L1 to the fifth lens element L5 and difficult to correct, thereby improving the imaging quality of the optical lens 100. Through the reasonable arrangement of the refractive power and the surface type of the first lens, the second lens, the third lens and the fourth lens, the miniaturization design of the optical lens is favorably realized, the imaging quality of the optical lens is improved, the optical lens has a long focal length, and a long-distance object can obtain a short-distance imaging effect.

In some embodiments, the optical lens 100 may be applied to electronic devices such as smart phones and smart tablets, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be made of plastic, so that the optical lens 100 has a good optical effect and reduces the cost.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 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 102 may also be disposed between two adjacent lenses, for example, between the second lens L2 and the third lens L3, and the setting is adjusted according to the actual situation, which is not limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter L7, such as an infrared filter, disposed between the image side surface S12 of the sixth lens element L6 and the image plane 101 of the optical lens 100, so as to filter out light in other bands, such as visible light, and only allow infrared light to pass through, so that the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image in a dark environment and other special application scenes and can obtain a better image effect.

In some embodiments, the optical lens 100 satisfies the following relationship: f 43/ImgH is more than or equal to 45.5 and less than 61.0, wherein f is the effective focal length of the optical lens 100, and ImgH is the diagonal length of the effective imaging area on the imaging surface 101 of the optical lens 100. When this relational expression is satisfied, the optical lens 100 can be ensured to have a telephoto characteristic, and characteristics such as background blurring and telephoto shooting can be realized. If the upper limit of the relational expression is exceeded, the telephoto performance of the optical lens 100 can be further enhanced, but the total length of the optical lens 100 is further increased, which is disadvantageous for the miniaturization of the optical lens. When the value is lower than the lower limit of the relational expression, the design requirement of the optical lens 100 for the super-telephoto characteristic cannot be satisfied.

In some embodiments, the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 are aspheric, and the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 are formed with diffractive optical structures. The image-side surface S2 of the first lens element L1 and the object-side surface S3 of the second lens element L2 are aspheric surfaces, and the aspheric surfaces are used as a substrate to form a diffractive optical structure on the basis of the aspheric surfaces, that is, a diffractive surface is formed on the basis of the aspheric surfaces, which is beneficial to reducing the aberration of the optical lens 100 and reducing the chromatic aberration to within 1um, and the curves of each waveband of the vertical axis chromatic aberration do not intersect, which is beneficial to improving the MTF value (Modulation Transfer Function).

In some embodiments, the optical lens 100 satisfies the following relationship: TTL/f is more than or equal to 0.77 and less than 1.0; wherein, TTL is a distance from the object side surface of the first lens element L1 to the image plane 101 of the optical lens barrel 100, i.e., the total length of the optical lens barrel 100. When the above relation is satisfied, the total length of the optical lens 100 is smaller than the effective focal length of the optical lens 100, which is beneficial to balancing the aberrations such as chromatic aberration, spherical aberration and distortion when the optical lens 100 is in telephoto, so that the optical lens 100 can obtain good imaging quality, and is also beneficial to realizing the miniaturized design of the optical lens 100. When the optical lens 100 satisfies the above relation and f is greater than 6mm, the optical lens 100 has a longer focal length, which is beneficial for the optical lens 100 to realize a telephoto function. When the optical lens 10 satisfies the above relation and TTL is less than 6.5mm, the optical lens 100 can be miniaturized and can be assembled in a thinner camera module or an electronic device.

In some embodiments, the optical lens 100 satisfies the following relationship: 5deg/mm < FOV/f < 8.2 deg/mm; where FOV is the maximum field angle of the optical lens 100. When f is increased, the maximum field angle FOV is decreased, and therefore, when the above relation is satisfied, the optical lens 100 can obtain a larger field angle FOV at a certain effective focal length, thereby satisfying the design requirement of the optical lens 100 with a long-focus performance and a wider shooting range.

In some embodiments, the f-number FNO of the optical lens 100 is less than 2.21, so that the optical lens 100 has a higher light input amount, and can provide better relative brightness and color control for telephoto shooting.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.9 < (| R32| + | R42|)/f is less than or equal to 13.44; wherein R32 is the radius of curvature of the image-side surface S6 of the third lens element L3 at the paraxial region O, and R42 is the radius of curvature of the image-side surface S8 of the fourth lens element L4 at the paraxial region O. The third lens L3 in the optical lens 100 provides positive refractive power, the fourth lens L4 provides negative refractive power, the combined structure of the third lens L3 and the fourth lens L4 can counteract most of the distortion and coma generated by the front lens (i.e., the first lens L1 and the second lens L2), and by properly setting the radii of curvature of the third lens L3 and the fourth lens L4, the third lens L3 and the fourth lens L4 can avoid introducing large spherical aberration and vertical axis chromatic aberration themselves, thereby facilitating the reasonable distribution of the primary aberration on each lens and reducing tolerance sensitivity.

In some embodiments, the optical lens 100 satisfies the following relationship: R51/CT56 is more than or equal to 94.94 and less than 485; wherein R51 is the radius of curvature of the object-side surface S9 of the fifth lens element L5 at a paraxial region O, and CT56 is the distance between the fifth lens element L5 and the sixth lens element L6 at the paraxial region O. The fifth lens element L5 in the optical lens assembly 100 has positive refractive power, which adjusts the refractive power distribution of the optical lens assembly 100, and helps to disperse the aberration and obtain high resolution. The curvature of the object-side surface of the fifth lens L5 changes, and the deflection angle of each field ray in the fifth lens L5 can be reduced. In addition, by reasonably setting the curvature radius of the object-side surface S9 of the fifth lens L5 and the ratio of the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O, the difficulty in molding and assembling the fifth lens L5 can be reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: 1 < (CT1+ CT2+ CT3)/BF < 2.1; wherein CT1 is the thickness of the first lens element L1 on the optical axis O, CT2 is the thickness of the second lens element L2 on the optical axis O, CT3 is the thickness of the third lens element L3 on the optical axis O, and BF is the minimum distance from the image-side surface S12 of the sixth lens element L6 to the image plane 101 of the optical lens 100 in the direction parallel to the optical axis O. When BF is greater than 0.75mm, when the optical lens 100 is applied to a camera module, a good matching relationship can be formed with a photosensitive chip of the camera module, and the assembly of the optical lens 100 and other components of the lens module is facilitated. Meanwhile, the thicknesses of the first lens L1, the second lens L2 and the third lens L3 and the distance between the first lens L1, the second lens L2 and the third lens L3 are reasonably arranged, so that the total length of the optical lens 100 can be reduced, the aberration generated by the first lens L1, the second lens L2 and the third lens L3 can be reduced, and the difficulty in balancing the aberration of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2 < SAG61/CT6 < 2.9; here, SAG61 is the distance in the direction of the optical axis O from the maximum clear aperture of the object-side surface S11 of the sixth lens L6 to the intersection point of the sixth lens L6 and the optical axis O, that is, the vector height of the object-side surface S11 of the sixth lens L6, and CT6 is the thickness of the sixth lens L6 on the optical axis O. When the relational expression is satisfied, the surface shape of the object side surface S11 of the sixth lens L6 can be reasonably restrained, a good deflection angle of marginal rays is ensured, and aberration which is difficult to correct due to too large deflection is avoided; if the height exceeds the upper limit of the relational expression, the rise of the object-side surface S11 of the sixth lens L6 becomes too large, and the surface shape of the object-side surface S11 of the sixth lens L6 at the circumference is excessively curved, which leads to poor molding and affects the manufacturing yield; below the lower limit of the relational expression, the object-side surface S11 of the sixth lens element L6 has an excessively smooth surface profile at the circumference, and therefore has insufficient deflecting ability for the light rays in the off-axis field, which is disadvantageous for correction of distortion and field curvature aberration.

In some embodiments, the optical lens 100 satisfies the following relationship:

11 < (| f3| + | f4| + | f5|)/(CT34+ CT45+ CT56) < 20; wherein f3 is an effective focal length of the third lens L3, f4 is an effective focal length of the fourth lens L4, f5 is an effective focal length of the fifth lens L5, CT34 is a distance between the third lens L3 and the fourth lens L4 on the optical axis O, CT45 is a distance between the fourth lens L4 and the fifth lens L5 on the optical axis O, and CT56 is a distance between the fifth lens L5 and the sixth lens L6 on the optical axis O. By properly configuring the refractive powers of the third lens element L3, the fourth lens element L4, and the fifth lens element L5 and the distances between the lens elements, the spherical aberration and the chromatic aberration generated by the front lens element (i.e., the first lens element L1 and the second lens element L2) can be balanced, and the overall image quality of the optical lens system 100 can be improved.

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, the optical lens 100 disclosed in the first embodiment of the present application includes an aperture stop 102, 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 filter L7, which are sequentially disposed along an optical axis O from an object side to an image side, wherein the first lens element L1 has a positive refractive power, the second lens element L2 has a negative refractive power, the third lens element L3 has a positive refractive power, the fourth lens element L4 has a negative refractive power, the fifth lens element L5 has a positive refractive power, and the sixth lens element L6 has a negative refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are respectively convex and concave at the paraxial region O, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are respectively convex and concave at the circumference, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are respectively convex and concave at the paraxial region O, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are respectively convex and concave at the circumference, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are respectively convex and concave at the paraxial region O, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are respectively convex and concave at the circumference, the object-side surface S4 and the image-side surface S4 of the fourth lens element L4 are respectively convex and concave at the paraxial region O, the object-side surface S4 and the image-side surface S4 are respectively concave at the paraxial region O, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex, respectively, at the circumference, the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively, at the paraxial region O, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively, at the circumference.

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 6.2mm, the maximum field angle FOV of the optical lens 100 is 39.0deg, the total optical length TTL of the optical lens 100 is 5.98mm, and the f-number FNO is 2.21. 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 number of surfaces is the object side surface of the lens, and the surface with the larger number of surfaces is the image side surface of the lens, and for example, the numbers 2 and 3 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radii in table 1 are the radius of curvature of the object or image side surface at the paraxial region O for the respective surface numbers. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side to the image side of the last lens of the first lens L1 is defined as the positive direction of the optical axis O, when the value is negative, the stop 102 is closer to the image side than the intersection point of the object side and the optical axis of the first lens, and if the value is positive, the stop 102 is closer to the object side than the intersection point of the object side and the optical axis of the first lens. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the reference wavelength for the effective focal length of the lens in table 1 is 555nm and the reference wavelength for the refractive index and abbe number of the lens material is 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 sixth lens L6 are aspheric, and the surface shape of each aspheric lens_Z0(r)The following aspheric formula may be used for definition, but is not limited to:

wherein the content of the first and second substances,_Z0(r)when the aspheric surface is at the position with the height of r along the optical axis direction, the distance from the vertex of the aspheric surface is higher; 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 a conic coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the respective aspherical mirror surfaces S1-S16 in the first embodiment.

TABLE 2

In the first embodiment, the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens form a diffractive optical structure on an aspherical basis, that is, the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens are formed as diffractive surfaces, and as shown in fig. 2 and 3, the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 of the present embodiment form a plane-type sagittal height map behind the diffractive surfaces, respectively. Curve 1 in fig. 2 is an actual surface contour of the image side surface S2 of the first lens L1, and curve 2 is a 10-fold enlarged curve of curve 1. Curve 1 in fig. 3 is the actual surface profile of the object-side surface S3 of the second lens, and curve 2 is a 10-fold enlarged curve of curve 1.

The profile z (r) after forming the diffractive surface on the aspheric substrate can be defined using, but not limited to, the following equation:

wherein the phase distribution function of the diffraction surface

Comprises the following steps:

φ(r)＝∑C_ir²ⁱ

λ is the wavelength of light, n₀Refractive index of aspheric substrate, Int is integer, C_iIs the phase coefficient of the diffraction surface. Table 3 shows the corresponding diffraction surface coefficients C1, C2 and C3 of the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 in the first embodiment.

TABLE 3

Number of noodles	2	3
			C1	-1.500E-03	-5.000E-04
C2	2.000E-04	-2.000E-04
			C3	0.000E+00	0.000E+00

Referring to fig. 4 (a), fig. 4 (a) shows a longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at 435nm, 470nm, 510nm, 555nm, 610nm, and 650 nm. In fig. 4 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 4 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 4 (B), fig. 4 (B) is a diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 555 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the sub-arc image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 4 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 4 (C), fig. 4 (C) is a distortion curve diagram of the optical lens 100 in 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. 4, the distortion of the optical lens 100 is well corrected at the wavelength of 555 nm.

Second embodiment

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes an aperture stop 102, 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 filter L7, which are disposed in order from an object side to an image side along an optical axis O, wherein 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, and the sixth lens element L6 has negative refractive power.

In the second embodiment, the effective focal length f of the optical lens 100 is 6.2mm, the maximum field angle FOV of the optical lens 100 is 39.0deg, the total optical length TTL of the optical lens 100 is 5.98mm, and the aperture FNO is 2.21, and other parameters are given in table 4 below, 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, the thickness, and the focal length Y in table 4 are mm. And the reference wavelength for the effective focal length of the lens in table 4 is 555nm and the reference wavelength for the refractive index and abbe number of the lens material is 587.56 nm.

TABLE 4

In the second embodiment, table 5 gives high order 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 5

In the second embodiment, the surface shape after forming the diffraction surface on the aspherical substrate can be defined by the formula given in the first embodiment.

Referring to fig. 6, fig. 6 shows a longitudinal spherical aberration diagram, a light astigmatism diagram and a distortion diagram of the optical lens 100 in the second embodiment, and the wavelength and coordinate axes in fig. 6 can be described with reference to the first embodiment. As can be seen from (a) in fig. 6, 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. 6, astigmatism of the optical lens 100 is well compensated at this wavelength. 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.

Third embodiment

Referring to fig. 7, fig. 7 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes an aperture stop 102, 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 filter L7, which are disposed in order from an object side to an image side along an optical axis O, wherein 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, and the sixth lens element L6 has negative refractive power.

In the third embodiment, the effective focal length f of the optical lens 100 is 7.0166mm, the maximum field angle FOV of the optical lens 100 is 39.9deg, the total optical length TTL of the optical lens 100 is 5.4175mm, and the f-number FNO is 2.55, and other parameters are given in table 6 below, and the definitions of the parameters can be found 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 6 are mm. And the reference wavelength for the effective focal length of the lens in table 6 is 555nm and the reference wavelength for the refractive index and abbe number of the lens material is 587.56 nm.

TABLE 6

In the third embodiment, table 7 gives high-order 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 7

In the third embodiment, the surface type after forming the diffraction surface on the aspherical substrate can be defined by the formula given in the first embodiment.

Referring to fig. 8, fig. 8 shows a longitudinal spherical aberration diagram, a light astigmatism diagram and a distortion diagram of the optical lens 100 in the third embodiment, and the wavelength and coordinate axes in fig. 8 can be described with reference to the first embodiment. As can be seen from (a) in fig. 8, 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. 8, astigmatism of the optical lens 100 is well compensated at this wavelength. 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.

Fourth embodiment

Referring to fig. 9, fig. 9 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application. The optical lens 100 includes an aperture stop 102, 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 filter L7, which are disposed in order from an object side to an image side along an optical axis O, wherein 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, and the sixth lens element L6 has negative refractive power.

In the fourth embodiment, the effective focal length f of the optical lens 100 is 7.5mm, the maximum field angle FOV of the optical lens 100 is 39.3deg, the total optical length TTL of the optical lens 100 is 6.47mm, and the aperture FNO is 2.55, and other parameters are given in table 8 below, and the definitions of the parameters can be found from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 8 are mm. And the reference wavelength for the effective focal length of the lens in table 8 is 546.0740nm, and the reference wavelength for the refractive index and abbe number of the lens material is 587.56 nm.

TABLE 8

In the fourth embodiment, table 9 gives high order 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 9

In the fourth embodiment, the surface type after forming the diffraction surface on the aspherical substrate can be defined by the formula given in the first embodiment.

Referring to fig. 10, fig. 10 shows a longitudinal spherical aberration curve, a light astigmatism diagram and a distortion curve of the optical lens 100 in the fourth embodiment, and the wavelength and coordinate axes in fig. 10 can be described with reference to the first embodiment. As can be seen from (a) in fig. 10, 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. 10, astigmatism of the optical lens 100 is well compensated at this wavelength. 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.

Fifth embodiment

Referring to fig. 11, fig. 11 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. The optical lens 100 includes an aperture stop 102, 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 filter L7, which are disposed in order from an object side to an image side along an optical axis O, wherein 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, and the sixth lens element L6 has negative refractive power.

In the fifth embodiment, the effective focal length f of the optical lens 100 is 7.475mm, the maximum field angle FOV of the optical lens 100 is 39.0deg, the total optical length TTL of the optical lens 100 is 6.47mm, and the aperture FNO is 2.53, and other parameters are given in table 10 below, and the definitions of the parameters can be found 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 10 are mm. And the reference wavelength for the effective focal length of the lens in table 10 is 555nm and the reference wavelength for the refractive index and abbe number of the lens material is 587.56 nm.

Watch 10

In the fifth embodiment, table 11 gives high-order 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.

TABLE 11

In the fifth embodiment, the surface type after forming the diffraction surface on the aspherical substrate can be defined by the formula given in the first embodiment.

Referring to fig. 12, fig. 12 shows a longitudinal spherical aberration curve, a light astigmatism graph and a distortion curve of the optical lens 100 in the fifth embodiment, and the wavelength and coordinate axes in fig. 12 can be described with reference to the first embodiment. As can be seen from (a) in fig. 12, 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. 12, astigmatism of the optical lens 100 is well compensated at this wavelength. As can be seen from (C) in fig. 12, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

Referring to table 12, table 12 summarizes ratios of the relations in the first embodiment to the fifth embodiment of the present application.

TABLE 12

Referring to fig. 13, the present application further discloses a camera module 200, where the camera module 200 includes a photosensitive chip 201 and the optical lens 100, and the photosensitive chip 201 is disposed on the image side of the optical lens 100. The camera module 200 with the optical lens 100 can satisfy the light, thin and miniaturized design, and simultaneously improve the imaging quality of the camera module 200, and enable the camera module 200 to have a long focal length, thereby enabling a long-distance object to obtain a close-distance imaging effect.

Referring to fig. 14, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a housing and the camera module 200, and the camera module 200 is disposed on the housing. The electronic device 300 with the camera module 200 can satisfy the light, thin and miniaturized design, and improve the imaging quality of the electronic device 300, and the electronic device 300 has a long focal length, so that a long-distance object can obtain a short-distance imaging effect.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in specific embodiments and application ranges, 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, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged in order from an object side to an image side along an optical axis;

the third lens element with positive refractive power;

the optical lens satisfies the following relation:

45.5≤f*43/ImgH＜61.0；

wherein f is an effective focal length of the optical lens, and ImgH is an image height corresponding to a maximum field angle of the optical lens.

2. The optical lens of claim 1, wherein the image-side surface of the first lens and the object-side surface of the second lens are aspheric, and the image-side surface of the first lens and the object-side surface of the second lens are formed with diffractive optical structures.

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

0.77≤TTL/f＜1.0；

wherein, TTL is a distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens.

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

5deg/mm＜FOV/f＜8.2deg/mm；

wherein the FOV is a maximum field angle of the optical lens.

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

1.9＜(|R32|+|R42|)/f≤13.44；

wherein R32 is a curvature radius of the image-side surface of the third lens element on the optical axis, and R42 is a curvature radius of the image-side surface of the fourth lens element on the optical axis.

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

94.94≤R51/CT56＜485；

wherein R51 is a curvature radius of an object-side surface of the fifth lens element at an optical axis, and CT56 is a distance between the fifth lens element and the sixth lens element on the optical axis.

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

1＜(CT1+CT2+CT3)/BF＜2.1；

wherein CT1 is a thickness of the first lens element on the optical axis, CT2 is a thickness of the second lens element on the optical axis, CT3 is a thickness of the third lens element on the optical axis, and BF is a minimum distance from an image side surface of the sixth lens element to an image plane of the optical lens element in a direction parallel to the optical axis.

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

0.2＜SAG61/CT6＜2.9；

SAG61 is a distance from a maximum clear aperture of an object side surface of the sixth lens to an intersection point of the sixth lens and the optical axis in the optical axis direction, and CT6 is a thickness of the sixth lens on the optical axis.

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

11＜(|f3|+|f4|+|f5|)/(CT34+CT45+CT56)＜20；

wherein f3 is an effective focal length of the third lens element, f4 is an effective focal length of the fourth lens element, f5 is an effective focal length of the fifth lens element, CT34 is a distance between the third lens element and the fourth lens element on the optical axis, CT45 is a distance between the fourth lens element and the fifth lens element on the optical axis, and CT56 is a distance between the fifth lens element and the sixth lens element on the optical axis.

10. A camera module, comprising a photosensitive chip and the optical lens of any one of claims 1 to 9, wherein the photosensitive chip is disposed on an image side of the optical lens.

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