CN114137690B

CN114137690B - Optical lens, camera module and electronic equipment

Info

Publication number: CN114137690B
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: 2023-07-04
Anticipated expiration: 2041-10-09
Also published as: CN114137690A

Abstract

The invention discloses an optical lens, an image capturing 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 sequentially arranged 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 relation: f is more than or equal to 45.5 and less than or equal to 43/ImgH is 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 ensure that the optical lens has 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 present invention relates to the field of optical imaging technologies, and in particular, to an optical lens, a camera module, and an electronic device.

Background

At present, with the development of image capturing technology, the application of an optical lens in electronic devices such as smart phones, tablet computers, video phones and the like is also becoming wider and wider, for example, photographing, photography or video call, and accordingly, the requirements of users on the volume and imaging quality of the optical lens are also becoming higher and higher, however, in the related art, 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, an imaging module and electronic equipment, which can ensure that the optical lens has a long focal length, meets the design requirement of miniaturization and improves the imaging quality.

In order to achieve the above object, the present invention discloses, in a first aspect, an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed 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 and a concave image-side surface at a paraxial region;

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

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

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

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 effective imaging area diagonal length on the imaging surface of the optical lens.

The optical lens provided by the application comprises the first lens element with positive refractive power and the second lens element with negative refractive power, which is favorable for correcting the spherical aberration of the optical lens element on the optical axis and improving the resolution, and meanwhile, the object side surface of the first lens element is convex at the paraxial region, which is favorable for enhancing the positive refractive power of the first lens element and improving the capability of the first lens element for converging light rays; the third lens element provides positive refractive power, the fourth lens element provides negative refractive power, and the combined structure of the third lens element and the fourth lens element counteracts most of the distortion and coma aberration generated by the front lens element (i.e., the first lens element and the second lens element); the design that the image side surface of the fourth lens is concave at the paraxial region can optimize the aberration correction capability of the optical lens, and is beneficial to improving the imaging quality of the optical lens; the fifth lens has positive refractive power, and the refractive power distribution of the whole optical lens is allocated, so that the aberration can be dispersed, and high resolution can be obtained; the sixth lens element provides negative refractive power for the optical lens element, which is beneficial to balancing the aberration of the incident light beam, which is difficult to correct, generated from the first lens element to the fifth lens element, thereby improving the imaging quality of the optical lens element. The refractive power and the surface shape of the first lens element to the sixth lens element are reasonably configured, so that the miniaturization design of the optical lens element is facilitated, the imaging quality of the optical lens element is improved, the optical lens element has a long focal length, and a near-distance imaging effect can be achieved for a long-distance object.

In addition, the optical lens provided by the application meets the following relation: when f is less than or equal to 45.5 and less than or equal to 43/ImgH is less than 61.0, and the relational expression is satisfied, the optical lens can be ensured to have long focal length characteristics, and the characteristics of background blurring, long-distance shooting and the like are realized. When the upper limit of the relation is exceeded, the long-focus performance of the optical lens can be further enhanced, but the total length of the optical lens is further increased, which is disadvantageous for realizing a miniaturized design. When the design requirement of the ultra-long focal property of the optical lens cannot be met if the design requirement is lower than the lower limit of the relation.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, an image side surface of the first lens and an 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 aberration of the optical lens is reduced, chromatic aberration is reduced to be within 1um, curves of the vertical axis chromatic aberration wave bands are not crossed, and the MTF value (Modulation Transfer Function, modulus transmission value) is improved.

As an alternative implementation manner, 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 the distance from the object side surface of the first lens to the imaging surface of the optical lens, i.e. the total length of the optical lens.

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 favorable for balancing chromatic aberration, spherical aberration, distortion and other aberration when the optical lens is in telephoto, so that the optical lens can obtain good imaging quality, and is also favorable for realizing the miniaturized design of the optical lens. When the optical lens meets the relation and f is more than 6mm, the optical lens has a longer focal length, and is beneficial to realizing a telephoto function. When the optical lens meets the relation and TTL is less than 6.5mm, the optical lens is favorable for realizing miniaturization design, and the optical lens can be assembled in a thinner camera module or electronic equipment.

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

When f increases, the maximum field angle is reduced, so that when the above relation is satisfied, the optical lens can obtain a larger field angle under a certain effective focal length, thereby simultaneously satisfying the design requirement of the optical lens for long-focus performance and wider shooting range.

As an alternative implementation manner, 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 element 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 counteracts most of the distortion and coma aberration 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 avoid introducing larger spherical aberration and vertical axis chromatic aberration, thereby facilitating reasonable distribution of primary aberration on each lens element and reducing tolerance sensitivity.

As an alternative implementation manner, 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 or equal to 485; wherein R51 is a radius of curvature of the object side surface of the fifth lens element at a paraxial region, and CT56 is a distance between the fifth lens element and the sixth lens element on the optical axis.

The fifth lens element of the optical lens has positive refractive power, and the refractive power distribution of the whole optical lens element is adjusted, so that the aberration can be dispersed, and high resolution can be obtained. The curvature of the object side surface of the fifth lens is changed, so that the deflection angle of each view ray at the fifth lens can be reduced. In addition, the forming and assembling difficulty of the fifth lens can be reduced by reasonably setting the ratio of the curvature radius of the object side surface of the fifth lens and the spacing between the fifth lens and the sixth lens on the optical axis.

As an alternative implementation manner, 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 the thickness of the first lens element on the optical axis, CT2 is the thickness of the second lens element on the optical axis, CT3 is the thickness of the third lens element on the optical axis, and BF is the minimum distance from the image side surface of the sixth lens element to the imaging surface 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 the photosensitive chip of the camera module when being applied to the camera module, and is also more beneficial to the assembly of the optical lens and other components of the lens module. Meanwhile, through reasonable arrangement of the thicknesses of the first lens, the second lens and the third lens and the distances among the first lens, the second lens and the third lens, namely compact arrangement among the first lens, the second lens and the third lens, the total length of the optical lens can be reduced, meanwhile, aberration generated by the first lens, the second lens and the third lens can be reduced, and further difficulty in balancing the aberration of the optical lens can be reduced.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: SAG61/CT6 is more than 0.2 and less than 2.9; wherein SAG61 is the distance between the maximum clear aperture of the object side surface of the sixth lens and the intersection point of the sixth lens and the optical axis in the optical axis direction, that is, 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 relation is satisfied, the surface shape of the object side surface of the sixth lens can be reasonably restrained, so that good deflection angle of marginal rays is ensured, and aberration which is not easy to correct and is caused by overlarge deflection is avoided; when the upper limit of the relation is exceeded, the sagittal height of the object side surface of the sixth lens is too large, and the object side surface of the sixth lens is excessively bent at the circumference, so that poor molding is caused, and the manufacturing yield is affected; when the lower limit of the relation is lower, the object side surface of the sixth lens element is too smooth at the circumference, and the off-axis view field light ray has insufficient deflection capability, which is not beneficial to the correction of distortion and curvature of field aberration.

As an alternative implementation manner, 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, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, CT34 is a distance between the third lens and the fourth lens on the optical axis, CT45 is a distance between the fourth lens and the fifth lens on the optical axis, and CT56 is a distance between the fifth lens and the sixth lens 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, spherical aberration and 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 element can be improved.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes a photosensitive chip and the optical lens described in the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can improve the imaging quality of the camera module while meeting the light, thin and miniaturized design, and the camera module has long focal length, so that a long-distance object can obtain the effect of close-distance imaging.

In a third aspect, the invention also discloses an electronic device, which comprises a housing and the camera module set in the second aspect, wherein the camera module set is arranged in the housing. The electronic equipment with the camera module can improve the imaging quality of the electronic equipment while meeting the requirements of light weight and miniaturization design, and can 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:

the embodiment of the invention provides an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises six lenses, and the following relational expression is satisfied when the size and the refractive power of each lens are reasonably configured: when f is less than or equal to 45.5 and less than or equal to 43/ImgH is less than 61.0, the imaging quality of the optical lens is improved while the miniaturized design and the imaging quality are realized, the long-focus characteristic of the optical lens is ensured, the effect of short-distance imaging of a long-distance object can be obtained, and the characteristics of background blurring, long-distance shooting and the like are realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a sagittal view of the image side of the first lens disclosed in the first embodiment of this application;

FIG. 3 is a sagittal view of the object-side surface of the second lens disclosed in the first embodiment of this application;

fig. 4 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the first embodiment of the present application;

FIG. 5 is a schematic view of an optical lens disclosed in a second embodiment of the present application;

fig. 6 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the second embodiment of the present application;

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

fig. 8 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the third embodiment of the present application;

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

fig. 10 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the fourth embodiment of the present application;

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

fig. 12 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a fifth embodiment of the present application;

FIG. 13 is a schematic view of the structure of the camera module disclosed in the present application;

Fig. 14 is a schematic structural view of an electronic device disclosed in the present application.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.

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

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The technical scheme of the invention will be further described with reference to the examples and the accompanying drawings.

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 sequentially disposed from an object side to an image side along an optical axis O. In 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 order from the object side of the first lens L1 and finally forms an image on the imaging surface 101 of the optical lens 100. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power.

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

The optical lens provided by the present application, the first lens element L1 and the second lens element L2 have positive refractive power and negative refractive power, respectively, which is beneficial to correcting spherical aberration of the optical lens element 100 on the optical axis O, improving resolution, and meanwhile, the object-side surface S1 of the first lens element L1 is convex at the paraxial region O, which is beneficial to enhancing refractive power of the first lens element L1 and improving the capability of the first lens element L1 to converge light. The third lens element L3 with positive refractive power and the fourth lens element L4 with positive refractive power, the combined structure of the third lens element L3 and the fourth lens element L4 can counteract most of the distortion and coma generated by the front lens element (i.e., the first lens element L1 and the second lens element L2). The concave design of the image side surface of the fourth lens element L4 at the paraxial region O can optimize the aberration correction capability of the optical lens assembly 100, which is beneficial to improving the imaging quality of the optical lens assembly 100; the fifth lens element L5 has positive refractive power, and is configured to distribute refractive power of the entire optical lens element 100, thereby facilitating aberration dispersion and obtaining high resolution. The sixth lens element L6 provides negative refractive power to the optical lens 100, which is beneficial to balancing the aberration generated by the incident light passing through the first lens element L1 to the fifth lens element L5, thereby improving the imaging quality of the optical lens 100. The refractive power and the surface shape of the first lens element to the sixth lens element are reasonably configured, so that the miniaturization design of the optical lens element is facilitated, the imaging quality of the optical lens element is improved, the optical lens element has a long focal length, and a near-distance imaging effect can be achieved for a long-distance object.

In some embodiments, the optical lens 100 may be applied to electronic devices such as a smart phone and a smart tablet, and materials of 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 plastic, so that the optical lens 100 has good optical effects and can reduce cost.

In some embodiments, the optical lens 100 further includes a diaphragm 102, and the diaphragm 102 may be an aperture diaphragm or a field diaphragm, 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 to be understood that in other embodiments, the diaphragm 102 may be disposed between two adjacent lenses, for example, between the second lens L2 and the third lens L3, and the arrangement is adjusted according to the actual situation, which is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 further includes an optical filter L7, such as an infrared optical filter, disposed between the image side surface S12 of the sixth lens element L6 and the imaging surface 101 of the optical lens 100, so as to filter out light rays of other wavelength 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, i.e., the optical lens 100 can also image in a dim environment and other special application scenarios and obtain better image effects.

In some embodiments, the optical lens 100 satisfies the following relationship: 45.5.ltoreq.f.times.43/ImgH < 61.0, where f is the effective focal length of the optical lens 100 and ImgH is the effective imaging zone diagonal length on the imaging surface 101 of the optical lens 100. When the relational expression is satisfied, the optical lens 100 can be ensured to have a long focal length characteristic, and characteristics such as background blurring and long-distance shooting can be realized. When the upper limit of the relation is exceeded, the long-focus 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 in realizing a miniaturized design. When the lower limit of the relation is lower, the design requirement of the ultra-long focal property of the optical lens 100 cannot be met.

In some embodiments, 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, and the image side surface S2 of the first lens element L1 and the object side surface S3 of the second lens element 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, and the aspheric surfaces are used as substrates, so that a diffractive optical structure is formed on the aspheric surfaces, that is, a diffractive surface is formed on the aspheric surfaces, which is advantageous for reducing aberration of the optical lens 100, reducing chromatic aberration to within 1um, and curves of the chromatic aberration of the vertical axis in each band do not intersect, which is advantageous for improving the MTF value (Modulation Transfer Function, modulus transmission value).

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 the distance from the object side surface of the first lens L1 to the imaging surface 101 of the optical lens 100, i.e. the total length of the optical lens 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 favorable for balancing chromatic aberration, spherical aberration, distortion and other aberrations when the optical lens 100 is in a telephoto state, so that the optical lens 100 can obtain good imaging quality, and is also favorable for realizing the miniaturized design of the optical lens 100. When the optical lens 100 satisfies the above relation and f >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 the TTL is less than 6.5mm, the optical lens 100 is advantageous to be miniaturized and can be assembled in a thinner camera module or electronic device.

In some embodiments, the optical lens 100 satisfies the following relationship: 5deg/mm < FOV/f < 8.2deg/mm; wherein FOV is the maximum field angle of the optical lens 100. When f increases, the maximum field angle FOV decreases, so that 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 for a long focal length and a wider shooting range.

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

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 a radius of curvature of the image-side surface S6 of the third lens element L3 at the paraxial region O, and R42 is a radius of curvature of the image-side surface S8 of the fourth lens element L4 at the paraxial region O. The third lens element L3 of the optical lens 100 provides positive refractive power, the fourth lens element L4 provides negative refractive power, the combined structure of the third lens element L3 and the fourth lens element L4 counteracts most of the distortion and coma aberration generated by the front lens element (i.e., the first lens element L1 and the second lens element L2), and by reasonably setting the radii of curvature of the third lens element L3 and the fourth lens element L4, larger spherical aberration and vertical chromatic aberration introduced by the third lens element L3 and the fourth lens element L4 themselves can be avoided, thereby facilitating reasonable distribution of primary aberration over the respective lens elements 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 or equal to 485; wherein R51 is a radius of curvature of the object side surface S9 of the fifth lens element L5 at the paraxial region O, and CT56 is a distance between the fifth lens element L5 and the sixth lens element L6 on the optical axis O. The fifth lens element L5 of the optical lens 100 has positive refractive power, and the refractive power distribution of the entire optical lens 100 is adjusted, so as to facilitate dispersion of aberration and obtain high resolution. The curvature of the object side surface of the fifth lens L5 is changed, so that the deflection angle of each field light ray at the fifth lens L5 can be reduced. In addition, by reasonably setting the ratio of the radius of curvature of the object side surface S9 of the fifth lens element L5 and the spacing between the fifth lens element L5 and the sixth lens element L6 on the optical axis O, the molding and assembling difficulty of the fifth lens element 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 imaging surface 101 of the optical lens assembly 100 in a direction parallel to the optical axis O. When BF is greater than 0.75mm, the optical lens 100 can form a good matching relationship with the photosensitive chip of the camera module when applied to the camera module, and is also more beneficial to the assembly of the optical lens 100 and other components of the lens module. Meanwhile, through reasonable arrangement of the thicknesses of the first lens L1, the second lens L2 and the third lens L3 and the distances among the first lens L1, the second lens L2 and the third lens L3, namely, compact arrangement among the first lens L1, the second lens L2 and the third lens L3, the total length of the optical lens 100 can be reduced, meanwhile, aberration generated by the first lens L1, the second lens L2 and the third lens L3 can be reduced, and further difficulty in balancing the aberration of the optical lens 100 can be reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: SAG61/CT6 is more than 0.2 and less than 2.9; the SAG61 is a distance from the maximum clear aperture of the object side surface S11 of the sixth lens L6 to an intersection point of the sixth lens L6 and the optical axis O in the direction of the optical axis O, that is, a sagittal height of the object side surface S11 of the sixth lens L6, and the CT6 is a thickness of the sixth lens L6 on the optical axis O. When the relation is satisfied, the surface shape of the object side surface S11 of the sixth lens L6 can be reasonably restrained, so that good deflection angle of marginal rays is ensured, and aberration which is not easy to correct and is caused by overlarge deflection is avoided; when the upper limit of the relation is exceeded, the sagittal height of the object side surface S11 of the sixth lens element L6 is excessively large, and the object side surface S11 of the sixth lens element L6 is excessively curved in the surface shape at the circumference, thereby causing poor molding and affecting the manufacturing yield; when the lower limit of the relation is lower, the object-side surface S11 of the sixth lens element L6 is too smooth at the circumference, and the off-axis field of view ray is not sufficiently deflected, which is not favorable for correcting distortion and curvature of field.

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 element L3, f4 is an effective focal length of the fourth lens element L4, f5 is an effective focal length of the fifth lens element L5, CT34 is a distance between the third lens element L3 and the fourth lens element L4 on the optical axis O, CT45 is a distance between the fourth lens element L4 and the fifth lens element L5 on the optical axis O, and CT56 is a distance between the fifth lens element L5 and the sixth lens element L6 on the optical axis O. By reasonably 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, spherical aberration and chromatic aberration generated by the front lens element assembly (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 assembly 100 can be improved.

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

First embodiment

As shown in fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application is shown in fig. 1, wherein the optical lens 100 includes a 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 element L7, which are disposed in order from an object side to an image side along an optical axis O, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has 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 and the image-side surface S2 of the first lens element L1 are 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 convex and concave at the peripheral region O, the object-side surface S3 and the image-side surface S4 of the fourth lens element L2 are 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 convex and concave at the peripheral region O, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are 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 convex and concave at the peripheral region O, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave at the peripheral region O, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave at the peripheral region O, the object-side surface S9 and the image-side surface S10 are concave at the paraxial region O, and the object-side surface S6 at the peripheral region O, and the object-side surface S12 at the sixth lens element S6 at the peripheral region O, respectively.

Specifically, taking the effective focal length f=6.2 mm of the optical lens 100, the maximum field angle fov=39.0 deg of the optical lens 100, the total optical length ttl=5.98 mm of the optical lens 100, and the f-number fno=2.21 as an example, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 2 and 3 correspond to the object side surface S1 and the image side surface S2 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object or image side of the corresponding surface number at the paraxial region O. The first value in the "thickness" parameter array 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 of the lens to the latter surface on the optical axis O. The value of the aperture 102 in the "thickness" parameter row is the distance between the aperture 102 and the vertex of the latter surface (the vertex refers to the intersection point of the surface and the optical axis O) on the optical axis O, and the direction from the object side surface of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis O by default, when the value is negative, the aperture 102 is closer to the image side than the intersection point of the object side surface of the first lens and the optical axis, and when the value is positive, the aperture 102 is closer to the object side than the intersection point of the object side surface of the first lens and the optical axis. It is understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. And the reference wavelength of the effective focal length of the lens in table 1 is 555nm, and the reference wavelength of the refractive index and abbe number of the lens material is 587.56nm.

TABLE 1

In the first embodiment, the object side surface and the image side surface of any one of the first lens L1 to the sixth lens L6 are aspherical, and the surface profile Z of each aspherical lens ₀ (r) may be defined using, but is not limited to, the following aspheric equation:

wherein Z is ₀ (r) is aspheric and is high in the direction of the optical axisWhen the degree is r, the distance from the vertex of the aspheric surface is sagittal; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of the radius R of Y in table 1 above); k is a conic coefficient; ai is a correction coefficient corresponding to the i-th higher term of the aspherical surface. Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors S1-S16 in the first embodiment.

TABLE 2

In the first embodiment, the image side surface S2 of the first lens element L1 and the object side surface S3 of the second lens element form a diffractive optical structure on the basis of an aspheric surface, that is, the image side surface S2 of the first lens element L1 and the object side surface S3 of the second lens element form a diffractive surface, as shown in fig. 2 and 3, which are the plane-type sagittal elevation diagrams of the first lens element L1 and the object side surface S3 of the second lens element L2 in the present embodiment. Curve 1 in fig. 2 is an actual surface profile of the image side surface S2 of the first lens L1, and curve 2 is a 10-fold enlarged curve of the 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 diffraction plane on the aspherical substrate can be defined using, but not limited to, the following formula:

wherein the phase distribution function of the diffraction plane

The method comprises the following steps:

φ(r)＝∑C _i r ²ⁱ

lambda is the wavelength of light, n ₀ Is the refractive index of the aspheric substrate, int is a round, C _i Is the phase coefficient of the diffraction plane. Table 3 shows the diffraction plane coefficients C1, C2, and C3 corresponding to the image side surface S2 of the first lens L1 and the object side surface S3 of the second lens L2, respectively, in the first embodiment.

TABLE 3 Table 3

Face number	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 diagram of the optical lens 100 of the first embodiment at wavelengths 435nm, 470nm, 510nm, 555nm, 610nm, and 650 nm. In fig. 4 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 4 (a), the optical lens 100 in the first embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

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

Referring to fig. 4 (C), fig. 4 (C) is a graph showing a distortion curve of the optical lens 100 at a wavelength of 555nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 4 (C), the distortion of the optical lens 100 is well corrected at a 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 disclosure. The optical lens 100 includes a 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 element 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, taking the effective focal length f=6.2 mm of the optical lens 100, the maximum field angle fov=39.0 deg of the optical lens 100, the total optical length ttl=5.98 mm of the optical lens 100, and the f-number fno=2.21 as examples, other parameters are given in the following table 4, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 4 are all mm. And the reference wavelength of the effective focal length of the lens in table 4 is 555nm, and the reference wavelength of the refractive index and abbe number of the lens material is 587.56nm.

TABLE 4 Table 4

In the second embodiment, table 5 gives the higher order coefficients that can be used for each aspherical mirror in the second embodiment, where each aspherical mirror shape can be defined by the formula given in the first embodiment.

TABLE 5

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In the second embodiment, the surface form 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 curve, a light astigmatism curve and a distortion curve of the optical lens 100 according to the second embodiment, and the description of the wavelength and the coordinate axes in fig. 6 can be described with reference to the first embodiment. As can be seen from fig. 6 (a), the optical lens 100 in the second embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 6 (B), at this wavelength, the astigmatism of the optical lens 100 is well compensated. As can be seen from fig. 6 (C), the distortion of the optical lens 100 becomes well corrected at the 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 disclosure. The optical lens 100 includes a 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 element 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, taking the effective focal length f= 7.0166mm of the optical lens 100, the maximum field angle fov=39.9 deg of the optical lens 100, the total optical length ttl= 5.4175mm of the optical lens 100, and the f-number fno=2.55 as examples, other parameters are given in the following table 6, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 6 are all mm. And the reference wavelength of the effective focal length of the lens in table 6 is 555nm, and the reference wavelength of the refractive index and abbe number of the lens material is 587.56nm.

TABLE 6

In a third embodiment, table 7 gives the higher order coefficients that can be used for each of the aspherical mirror surfaces in the third embodiment, where each of the aspherical surface profiles can be defined by the formula given in the first embodiment.

TABLE 7

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In the third embodiment, the surface form 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 curve, a light astigmatism curve and a distortion curve of the optical lens 100 according to the third embodiment, and the description of the wavelength and the coordinate axes in fig. 8 can be described with reference to the first embodiment. As can be seen from fig. 8 (a), the optical lens 100 in the third embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 8 (B), at this wavelength, the astigmatism of the optical lens 100 is well compensated. As can be seen from fig. 8 (C), the distortion of the optical lens 100 becomes well corrected at the 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 disclosure. The optical lens 100 includes a 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 element 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, taking the effective focal length f=7.5 mm of the optical lens 100, the maximum field angle fov=39.3 deg of the optical lens 100, the total optical length ttl=6.47 mm of the optical lens 100, and the f-number fno=2.55 as examples, other parameters are given in the following table 8, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 8 are all mm. And the reference wavelength of the effective focal length of the lens in table 8 was 546.0740nm, and the reference wavelength of the refractive index and abbe number of the lens material was 587.56nm.

TABLE 8

In the fourth embodiment, table 9 gives the higher order coefficients that can be used for each aspherical mirror in the fourth embodiment, where each aspherical mirror shape can be defined by the formula given in the first embodiment.

TABLE 9

In the fourth embodiment, the surface form 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 curve and a distortion curve of the optical lens 100 according to the fourth embodiment, and the description of the wavelength and the coordinate axes in fig. 10 can be described with reference to the first embodiment. As can be seen from fig. 10 (a), the optical lens 100 in the fourth embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 10 (B), at this wavelength, the astigmatism of the optical lens 100 is well compensated. As can be seen from fig. 10 (C), the distortion of the optical lens 100 becomes well corrected at the 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 disclosure. The optical lens 100 includes a 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 element 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, taking the effective focal length f= 7.475mm of the optical lens 100, the maximum field angle fov=39.0 deg of the optical lens 100, the total optical length ttl=6.47 mm of the optical lens 100, and the f-number fno=2.53 as examples, other parameters are given in the following table 10, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in Table 10 are all mm. And the reference wavelength of the effective focal length of the lens in table 10 is 555nm, and the reference wavelength of the refractive index and abbe number of the lens material is 587.56nm.

Table 10

In the fifth embodiment, table 11 gives the higher order coefficients that can be used for each aspherical mirror surface in the fifth embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 11

In the fifth embodiment, the surface form 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 curve and a distortion curve of the optical lens 100 according to the fifth embodiment, and the description of the wavelength and the coordinate axes in fig. 12 can be described with reference to the first embodiment. As can be seen from fig. 12 (a), the optical lens 100 in the fifth embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 12 (B), at this wavelength, the astigmatism of the optical lens 100 is well compensated. As can be seen from fig. 12 (C), the distortion of the optical lens 100 becomes well corrected at the wavelength of 555 nm.

Referring to table 12, table 12 is a summary of the ratios of the relationships in the first embodiment to the fifth embodiment of the present application.

Table 12

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

Referring to fig. 14, the application further discloses an electronic device 300, where 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 improve the imaging quality of the electronic device 300 while meeting the light, thin and miniaturized design, and can enable the electronic device 300 to have a long focal length and enable a long-distance object to 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, and specific examples are applied to the description of the principles and the implementation modes of the present invention, and the description of the above embodiments is only used to help understand the optical lens, the camera module, the electronic device and the core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

1. An optical lens, characterized in that the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens 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 lens with the refractive power of the optical lens is the six lens;

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 image height corresponding to the maximum field angle of the optical lens.

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

3. The optical lens of claim 1, wherein: the optical lens satisfies the following relation:

0.77≤TTL/f＜1.0；

wherein TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis.

4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

5deg/mm＜FOV/f＜8.2deg/mm；

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

5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

1.9＜(|R32|+|R42|)/f≤13.44；

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

6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

94.94≤R51/CT56＜485；

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

7. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

1＜(CT1+CT2+CT3)/BF＜2.1；

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

8. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

0.2＜SAG61/CT6＜2.9；

wherein SAG61 is a distance between a maximum clear aperture of an object side surface of the sixth lens and 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. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

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

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

10. An imaging module comprising a photosensitive chip and the optical lens according to 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.