CN114002822A

CN114002822A - Optical lens, camera module and electronic equipment

Info

Publication number: CN114002822A
Application number: CN202111513774.0A
Authority: CN
Inventors: 党绪文; 刘彬彬; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-02-01
Anticipated expiration: 2041-12-10
Also published as: CN114002822B

Abstract

The application discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis, the first lens has positive focal power, the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface at a position close to the optical axis, the second lens has positive focal power, the image side surface of the second lens is a convex surface at a position close to the optical axis, and the third lens has focal power; the fourth lens has focal power, and the object side surface of the fourth lens is convex at the paraxial region; the fifth lens element has a focal power, and the object-side surface and the image-side surface of the fifth lens element are respectively convex and concave at a paraxial region, and the optical lens element satisfies the following relation: 1.2 < SD11/SD21 < 1.6. The application discloses optical lens, module and electronic equipment make a video recording can realize the formation of image effect of super wide angle on the basis of considering optical lens's miniaturization, frivolous design.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

In recent years, various electronic devices (including digital cameras, smart phones, notebook computers, tablet computers, and the like) equipped with imaging lenses have been rapidly spreading. The portability of the electronic equipment is improved, higher requirements are put on the thickness of the camera lens, and meanwhile, the use of a large image plane chip is a necessary trend, so that the camera lens is reduced in thickness, the quality of an imaged image is reduced due to the fact that the support of a large image plane needs to be maintained, and the manufacturability is poor; especially for the ultra-wide-angle camera lens, because the conventional ultra-wide-angle camera lens uses a symmetrical structure with a middle diaphragm, the ultra-wide-angle camera lens is difficult to be fully miniaturized, and therefore the problems of improving the thinness of the ultra-wide-angle camera lens and maintaining good imaging quality are urgently solved.

Disclosure of Invention

The embodiment of the application discloses optical lens, camera module and electronic equipment can realize the imaging effect of super wide angle on the basis of giving consideration to miniaturization and light and thin design of optical lens.

In order to achieve the above object, in a first aspect, the present application discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from an object side to an image side along an optical axis;

the first lens has positive focal power, and the object side surface and the image side surface of the first lens are respectively convex and concave at a paraxial region;

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

the third lens has optical power;

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

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

the optical lens further comprises a diaphragm, and the diaphragm is positioned between the first lens and the second lens;

the optical lens satisfies the following relation:

1.2 < SD11/SD21 < 1.6, wherein SD11 is the maximum effective half aperture of the object side surface of the first lens and SD21 is the maximum effective half aperture of the object side surface of the second lens.

In the optical lens provided by the application, the first lens has positive focal power, so that the total length of the optical lens is favorably shortened, and the design that the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface at a paraxial region is matched, so that the positive focal power of the first lens is favorably enhanced, and meanwhile, a reasonable light ray incidence angle is further provided for introducing edge large-angle light rays; the second lens has positive focal power, and the image side surface of the second lens is convex at the paraxial region, which is beneficial to increasing the focal power of the second lens, so that the light rays contracted by the first lens can be gradually diffused, and the deflection angle of the light rays is reduced. The object side of fourth lens is the design of concave surface in passing optical axis department, be favorable to promoting the compactness between each lens of optical lens, realize shortening optical lens's total length, in order to realize optical lens's miniaturized design, the object side of cooperation fifth lens, the image side is the convex surface respectively in passing optical axis department, the design of concave surface, be favorable to rectifying distortion, astigmatism, the curvature of field, make optical lens can satisfy the imaging demand of low aberration high image quality, and simultaneously, when being applied to camera module with optical lens, can match in the sensitization chip of high luminance, thereby realize super wide angle, big image plane formation of image.

Further, the diaphragm of the optical lens is located between the first lens and the second lens, that is, the design of the front diaphragm is adopted, which is beneficial to the miniaturization design of the optical lens.

In addition, the optical lens is limited to satisfy the relation 1.2 < SD11/SD21 < 1.6, namely, the ratio of the maximum effective semi-aperture of the object side surface of the first lens to the maximum effective semi-aperture of the object side surface of the second lens is restricted, so that the size of the effective semi-aperture of the object side surface of the first lens can be effectively controlled, and the small-head small light-passing hole characteristic of the object side surface of the head lens of the optical lens is realized. The diaphragm that combines this application is located between first and the second lens, and the biggest effective half bore of the object side of the first lens of having solved super wide angle optical lens among the correlation technique is great, can't realize the problem of little head. If the upper limit of the above relation is exceeded, i.e., SD11/SD21 > 1.6, the maximum effective half aperture of the first lens is too large to satisfy the small head requirement of the optical lens. When the lower limit of the relation is exceeded, namely SD11/SD21 < 1.2, the maximum effective half aperture of the first lens is too small, and it is difficult to simultaneously ensure the reasonable central thickness of the ultra-wide angle and the first lens, namely when the ratio is too small, the first lens is very close to the second lens and the diaphragm, so that the central thickness of the first lens is severely compressed.

Therefore, the optical lens can give consideration to the ultra-wide angle, the large image plane and the miniaturization design, and can be suitable for the camera module and the electronic equipment which have the miniaturization design requirement.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation:

0.8＜|f4/R42|＜8.8；

wherein f4 is a focal length of the fourth lens, and R42 is a radius of curvature of an image side surface of the fourth lens at the optical axis.

The focal power of the fourth lens is adjusted by restricting the curvature radius of the image side surface of the fourth lens at the optical axis, so that the influence of the focal power on the process performance of the fourth lens caused by the fact that the focal power is too concentrated on the fourth lens is avoided, the restriction on the surface type of the object side surface and the image side surface of the fourth lens is facilitated, and the influence on the processing manufacturability of the fourth lens caused by excessive bending is avoided. In addition, the correction of high-order aberration can be further enhanced and the tolerance sensitivity of the optical lens can be reduced on the basis of reducing three-level aberrations such as spherical aberration, coma aberration and curvature of field. If the refractive power of the fourth lens exceeds the lower limit of the above relational expression, the refractive power of the fourth lens is too concentrated, and the surface shape of the image side surface of the fourth lens is too curved, which is disadvantageous in the workability of processing the fourth lens. When the refractive power of the fourth lens exceeds the upper limit of the above relational expression, the refractive power of the fourth lens is insufficient, which is disadvantageous for correcting the aberration of the optical lens and affects the tolerance sensitivity of the optical lens.

Preferably, 0.6mm < R42| < 3.5mm, so that under the constraint of the curvature radius of the image side surface of the fourth lens, the image side surface of the fourth lens is prevented from being excessively bent, particularly convex in the central area, and therefore low-angle stray light reflection of the fourth lens is reduced, and the influence of ghost on imaging is reduced.

85°＜FOV*IMGH/TTL＜110°；

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

The relational expression reflects the constraint condition of the optical lens on the field angle and the light and thin property, and when the relational expression is satisfied, the requirement of the optical lens on the light and thin property can be satisfied on the basis that the optical lens is in an ultra-wide angle, so that the optical lens can also have the light and thin property which is comparable to the large-field-angle optical lens in the related technology, and the requirement of the market on the miniaturization of the optical lens is satisfied. When the FOV is larger than 110 °, the IMGH/TTL is further reduced on the basis of ensuring the field angle of the optical lens to be an ultra-wide angle, which may excessively compress the light and thin property of the optical lens, and is not favorable for improving the performance of the optical lens. When FOV IMGH/TTL is less than 85 °, the optical lens is not thin enough, which is not favorable for the miniaturization design of the optical lens.

110 < FOV < 132. When the relational expression is satisfied, the optical lens can have a larger field angle, so that ultra-wide-angle imaging is realized.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: TTL is more than 3.7mm and less than 4.15mm, so that the total length of the optical lens is kept in a small range, and the design requirement of ultra-wide angle miniaturization can be met.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relation: 1.9 < Fno < 2.5, wherein the Fno is the diaphragm number of the optical lens. Thus, the optical lens can have reasonable light entering amount, thereby being beneficial to the optical lens to obtain reasonable resolving power.

0.32mm＜CT1+CT12＜0.45mm；

wherein CT1 is the thickness of the first lens element on the optical axis, i.e. the center thickness of the first lens element, and CT12 is the distance from the image-side surface of the first lens element to the object-side surface of the second lens element on the optical axis, i.e. the gap between the first and second lens elements.

It can be known from the foregoing that, the diaphragm of the optical lens is located between the first lens and the second lens, and the axial distance from the object-side surface of the first lens to the object-side surface of the second lens is constrained, so that the distances between the first lens and the diaphragm and between the first lens and the second lens can be shortened, thereby avoiding the situation that the first lens of the optical lens in the related art is far away from the second lens, facilitating the reduction of the gap between the first lens and the second lens, and enabling the optical lens to be designed in a miniaturized manner. In addition, the central thickness of the first lens and the gap between the first lens and the second lens are controlled, so that the first lens and the second lens have processing rationality, the first lens and the second lens are convenient to process, and the processing difficulty of the optical lens is reduced.

Preferably, 0.05mm < CT12 < 0.2mm, so that the gap between the first lens and the second lens is maintained within a reasonable range, the gap between the first lens and the second lens of the optical lens can be sufficiently compressed, and miniaturization and small head characteristics of the optical lens are realized.

1.0＜|f1/f5|＜17；

wherein f1 is a focal length of the first lens, and f5 is a focal length of the fifth lens.

Through restricting the ratio of the focal length of the first lens and the focal length of the fifth lens, the focal power distribution of the first lens and the fifth lens in the optical lens can be reasonably distributed, so that the requirements of the small head of the optical lens are met, and meanwhile, the reasonable aberration balance and the resolving power of the optical lens are kept. In addition, the first lens is arranged close to the second lens and has positive focal power, so that the distortion of the first lens with positive focal power to the rays with large angle of view is small compared with the first lens with negative focal power, and the distortion of the optical lens is favorably reduced. In addition, the distortion of the optical lens can be reasonably corrected and the optical distortion can be reasonably controlled by combining the control of the focal length of the fifth lens.

0.18＜FFL/TTL＜0.24；

wherein, FFL is the shortest distance between the image side surface of the fifth lens element and the imaging surface of the optical lens along the optical axis, i.e. the back focal length of the optical lens, and TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens along the optical axis, i.e. the total length of the optical lens.

The ratio of the back focal length of the optical lens to the total length of the optical lens is controlled, so that the back focal length of the optical lens has a certain matching relation with the total length of the optical lens, and the adverse condition that the total length of the optical lens is too long and the back focal length of the optical lens is too short is avoided; the back focal length of reasonable optical lens when optical lens is applied to the module of making a video recording, can avoid optical lens and the sensitization chip of the module of making a video recording too closely to lead to influencing the condition of the equipment feasibility and the equipment yield of the module of making a video recording to can improve the matching nature to the sensitization chip of difference. When FFL/TTL is more than 0.24, the ratio of the back focal length of the optical lens is too large, the space of each lens of the optical lens is compressed, and the performance optimization of the optical lens is not facilitated; and when FFL/TTL is less than 0.18, the back focal length of the optical lens is too small, the optical lens is difficult to match with the photosensitive chip, and the assembly risk of the optical lens is increased.

0.52＜SD51/IMGH＜0.78；

wherein SD51 is the maximum effective half aperture of the object-side surface of the fifth lens element, and IMGH is half the image height corresponding to the maximum field angle of the optical lens.

By limiting the ratio of the maximum effective half aperture of the object side surface of the fifth lens to the half image height corresponding to the maximum field angle of the optical lens, the maximum effective half aperture of the object side surface of the fifth lens can be restricted within a reasonable range, thereby realizing the miniaturization design of the optical lens. Secondly, when satisfying above-mentioned relational expression, the lifting distance of the marginal light through the fifth lens is suitable to when optical lens was applied to the module of making a video recording, the light that can keep passing through optical lens was suitable with the incident angle of the sensitization chip of the module of making a video recording, avoid the incident angle too big and cause the matching difficulty of sensitization chip. In addition, when the relational expression is satisfied, the lifting distance of the light is appropriate, and a reasonable light beam caliber is provided for the marginal light, so that the optical lens provides reasonable relative illumination while realizing a light and thin design, and a dark angle is avoided.

1.4＜f23/f＜2.2；

wherein f23 is a combined focal length of the second lens and the third lens, and f is an effective focal length of the optical lens.

By restricting the ratio of the combined focal length of the second lens and the third lens to the effective focal length of the optical lens, the focal powers of the second lens and the third lens can be properly distributed, and the third lens can generate diversified matching, so that the balance of the internal aberration of the optical lens can be realized on the basis of meeting the miniaturization design of the optical lens, the field curvature and astigmatism of the imaging edge of the optical lens can be favorably adjusted, and the imaging quality of the optical lens to the surrounding environment can be met.

In a second aspect, the present application discloses a camera module, which includes a photosensitive chip and an 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 shooting effect of a large visual angle and is small in design.

In a third aspect, the present application discloses an electronic device, which includes a housing and the camera module set as described in the second aspect, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module can meet the shooting effect of a large visual angle and is small in design.

Compared with the prior art, the beneficial effect of this application lies in:

in the optical lens provided by the application, the first lens has positive focal power, so that the total length of the optical lens is favorably shortened, and the design that the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface at the position of a paraxial region is matched, so that the positive focal power of the first lens is favorably enhanced, and meanwhile, a reasonable light incidence angle is further provided for introducing edge large-angle light; the second lens has positive focal power, and the image side surface of the second lens is convex at the paraxial region, which is beneficial to increasing the focal power of the second lens, so that the light rays contracted by the first lens can be gradually diffused, and the deflection angle of the light rays is reduced. The object side of fourth lens is the design of concave surface in passing optical axis department, be favorable to promoting the compactness between each lens of optical lens, realize shortening optical lens's total length, in order to realize optical lens's miniaturized design, the object side of cooperation fifth lens, the image side is the convex surface respectively in passing optical axis department, the design of concave surface, be favorable to rectifying distortion, astigmatism, the curvature of field, make optical lens can satisfy the imaging demand of low aberration high image quality, and simultaneously, when being applied to camera module with optical lens, can match in the sensitization chip of high luminance, thereby realize super wide angle, big image plane formation of image. In addition, the optical lens is limited to satisfy the relation 1.2 < SD11/SD21 < 1.6, namely, the ratio of the maximum effective semi-aperture of the object side surface of the first lens to the maximum effective semi-aperture of the object side surface of the second lens is restricted, so that the size of the effective semi-aperture of the object side surface of the first lens can be effectively controlled, and the small-head small light-passing hole characteristic of the object side surface of the head lens of the optical lens is realized. The diaphragm that combines this application is located between first and the second lens, and the biggest effective half bore of the object side of the first lens of having solved super wide angle optical lens among the correlation technique is great, can't realize the problem of little head.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

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

fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

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

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

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

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

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

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

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

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

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

fig. 13 is a schematic structural diagram of a lens 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 application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

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

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

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

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 application 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, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, which are sequentially disposed along an optical axis O from an object side to an image side. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 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 L1 has positive focal power, the second lens L2 has positive focal power, the third lens L3 has positive focal power or negative focal power, the fourth lens L4 has positive focal power or negative focal power, and the fifth lens L5 has positive focal power or negative focal power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 of the second lens element L2 can be concave or convex at the paraxial region O, and the image-side surface 22 of the second lens element L2 is convex at the paraxial region O; the object-side surface 31 of the third lens element L3 is convex at the paraxial region O, and the image-side surface 32 of the third lens element L3 is concave or convex at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is concave at the paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex or concave at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at a paraxial region O.

Further, the object-side surface 11 of the first lens element L1 is convex or concave at the circumference, and the image-side surface 12 of the first lens element L1 is concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively concave and convex at the circumference; the object-side surface 31 of the third lens element L3 is concave or convex at the circumference, and the image-side surface 32 of the third lens element L3 is concave or convex at the circumference; the object-side surface 41 of the fourth lens element L4 is concave at the circumference, and the image-side surface 42 of the fourth lens element L4 is concave or convex at the circumference; the object-side surface 51 of the fifth lens element L5 is concave at the circumference, and the image-side surface 52 of the fifth lens element L5 is convex at the circumference.

In some embodiments, in the first lens L1 to the sixth lens L6, each of the object-side surface and the image-side surface of the lens is aspheric. That is, each of the first lens L1 to the sixth lens L6 is an aspherical lens. The aspheric lens can reduce the processing difficulty of the lens, can realize more complex surface design and is beneficial to reducing the processing difficulty and the surface design difficulty of the optical lens.

Further, considering that the optical lens 100 is mostly applied to miniaturized electronic devices, 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 lenses, which are more lightweight and can accommodate lightweight design of the optical lens 100 when the optical lens 100 is applied to electronic devices.

In some embodiments, the optical lens 100 further includes a diaphragm 102, and the diaphragm 102 may be an aperture diaphragm and/or a field diaphragm, which may be disposed between the first lens L1 and the second lens L2, that is, the diaphragm 102 is a front diaphragm, and the arrangement of the front diaphragm can enable the head lens of the optical lens 100 to be miniaturized and meet the small head requirement of the optical lens 100. It is understood that, in other embodiments, the stop 102 may also be disposed between other lenses or between the object side of the optical lens 100 and the object side 11 of the first lens L1, and the setting may be adjusted according to practical situations, which is not limited in this embodiment.

In some embodiments, the optical lens 100 further includes an infrared filter 60, and the infrared filter 60 is disposed between the fifth lens element L5 and the image plane 101 of the optical lens 100. The infrared filter 60 is selected for use, infrared light is filtered, imaging quality is improved, and imaging is more in line with visual experience of human eyes. It is understood that the infrared filter 60 may be made of an optical glass coating, a colored glass, or an infrared filter 60 made of other materials, which may be selected according to actual needs, and is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < SD11/SD21 < 1.6, where SD11 is the maximum effective half aperture of the object-side face 11 of the first lens L1 and SD21 is the maximum effective half aperture of the object-side face 21 of the second lens L2. By limiting the optical lens 100 to satisfy the above relation 1.2 < SD11/SD21 < 1.6, that is, by restricting the ratio of the maximum effective half aperture of the object-side surface 11 of the first lens L1 to the maximum effective half aperture of the object-side surface 21 of the second lens L2, the size of the maximum effective half aperture of the object-side surface 11 of the first lens L1 can be effectively controlled, and the small-head small-clear-hole characteristic of the object-side surface of the head lens of the optical lens 100 is realized. The stop 102 is located between the first lens L1 and the second lens L2, which solves the problem that the maximum effective half aperture of the object-side surface 11 of the first lens L1 of the super-wide angle optical lens in the related art is large and the small head cannot be realized. If the upper limit of the above relation is exceeded, i.e., SD11/SD21 > 1.6, the maximum effective half-diameter of the first lens L1 is too large to satisfy the small head requirement of the optical lens 100. When the lower limit of the above relation is exceeded, i.e., SD11/SD21 < 1.2, the maximum effective half aperture of the first lens L1 is too small to simultaneously secure a reasonable center thickness of the ultra-wide angle and the first lens L1, i.e., when the above ratio is too small, the first lens L1 is very close to the second lens L2 and the stop 102, resulting in a severe compression of the center thickness of the first lens L1.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8 < | f4/R42| < 8.8; where f4 is the focal length of the fourth lens L4, and R42 is the radius of curvature of the image-side surface 42 of the fourth lens L4 at the optical axis O.

By restricting the curvature radius of the image-side surface 42 of the fourth lens L4 at the optical axis O, the focal power of the fourth lens L4 is adjusted, so as to avoid the process performance influence of the fourth lens L4 caused by the focal power being too concentrated on the fourth lens L4, and at the same time, help to restrict the surface types of the object-side surface 41 and the image-side surface 42 of the fourth lens L4, and avoid the processing manufacturability of the fourth lens L4 being influenced by excessive bending. In addition, satisfying the above relational expression, it is possible to further enhance correction of high-order aberration and reduce tolerance sensitivity of the optical lens 100 on the basis of reducing three-level aberrations such as spherical aberration, coma aberration, and curvature of field. If the refractive power of the fourth lens L4 is too concentrated, the surface profile of the image-side surface 42 of the fourth lens L4 is too curved, and the manufacturability of the fourth lens L4 is not favorable. If the upper limit of the above relational expression is exceeded, the refractive power of the fourth lens L4 is insufficient, which is disadvantageous for correcting the aberration of the optical lens 100 and affects the tolerance sensitivity of the optical lens 100.

In some embodiments, 85 ° < FOV IMGH/TTL < 110 °; wherein, the FOV is the maximum field angle of the optical lens 100, TTL is the distance from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens 100 on the optical axis O, i.e. the total length of the optical lens 100, and IMGH is half of the image height corresponding to the maximum field angle of the optical lens 100.

The relational expression reflects the constraint condition of the optical lens 100 on the field angle and the light and thin property, and when the relational expression is satisfied, the requirement of the optical lens 100 on the light and thin property can be satisfied on the basis that the optical lens 100 is in an ultra-wide angle, so that the optical lens 100 can also have the light and thin property which is comparable to that of a large-field-angle optical lens in the related art, and the requirement of the market on the miniaturization of the optical lens 100 is satisfied. When FOV is greater than 110 °, the IMGH/TTL is further reduced on the basis of ensuring the field angle of the optical lens 100 to be an ultra-wide angle, which may excessively compress the light and thin property of the optical lens 100, and is not favorable for improving the performance of the optical lens 100. When FOV IMGH/TTL is less than 85 °, the optical lens 100 is not thin enough, which is not favorable for the miniaturization of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.32mm < CT1+ CT12 < 0.45 mm; the thickness of the first lens element L1 on the optical axis O, i.e., the center thickness of the first lens element L1, is CT1, and the distance from the image-side surface 12 of the first lens element L1 to the object-side surface 21 of the second lens element L2 on the optical axis O, i.e., the gap between the first lens element L1 and the second lens element L2, is CT 12.

As can be seen from the foregoing, the stop 102 of the optical lens 100 is located between the first lens L1 and the second lens L2, and in combination with constraining the axial distance from the object-side surface 11 of the first lens L1 to the object-side surface 21 of the second lens L2, the distances between the first lens L1 and the stop 102 and the second lens L2 can be drawn closer, so that the situation that the first lens of the optical lens in the related art is far from the second lens can be avoided, and it is beneficial to reduce the gap between the first lens L1 and the second lens L2, thereby enabling the optical lens 100 to achieve a miniaturized design. In addition, the center thickness of the first lens L1 and the gap between the first lens L1 and the second lens L2 are controlled, so that the first lens L1 and the second lens L2 have machining rationality, the machining of the first lens L1 and the second lens L2 is facilitated, and the machining difficulty of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0 < | f1/f5| < 17; where f1 is the focal length of the first lens L1, and f5 is the focal length of the fifth lens L5.

By constraining the ratio of the focal length of the first lens L1 to the focal length of the fifth lens L5, the power distribution of the first lens L1 and the fifth lens L5 in the optical lens 100 can be reasonably distributed, so as to satisfy the small head requirement of the optical lens 100 and maintain the reasonable aberration balance and image resolution requirement of the optical lens 100. In addition, since the first lens L1 is disposed close to the second lens L2 and has positive focal power, the amount of distortion of the first lens L1 with positive focal power to the rays with large angle of view is smaller than that of the first lens with negative focal power, which is beneficial to reducing the distortion of the optical lens 100. In addition, in combination with the control of the focal length of the fifth lens L5, the amount of distortion of the optical lens 100 can be reasonably corrected and controlled.

In some embodiments, the optical lens 100 satisfies the following relationship: FFL/TTL is more than 0.18 and less than 0.24; wherein, FFL is the shortest distance in the optical axis direction from the image-side surface 52 of the fifth lens element L5 to the image plane 101 of the optical lens 100, i.e. the back focal length of the optical lens 100, and TTL is the distance in the optical axis direction from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens 100, i.e. the total length of the optical lens.

By controlling the ratio of the back focal length of the optical lens 100 to the total length of the optical lens 100, the back focal length of the optical lens 100 and the total length of the optical lens 100 have a certain matching relationship, thereby avoiding the adverse situation that the total length of the optical lens 100 is too long and the back focal length of the optical lens 100 is too short; the back focal length of the optical lens 100 is reasonable, when the optical lens 100 is applied to the camera module, the situation that the assembly feasibility and the assembly yield of the camera module are affected due to the fact that the optical lens 100 and the photosensitive chip of the camera module are too close to each other can be avoided, and therefore the matching performance of different photosensitive chips can be improved. When the FFL/TTL is greater than 0.24, the back focal length of the optical lens 100 is too large, which compresses the space of each lens of the optical lens 100 and is not favorable for optimizing the performance of the optical lens 100; when FFL/TTL is less than 0.18, the back focal length of the optical lens 100 is too small, making it difficult to match the optical lens 100 with the photo sensor chip, increasing the assembly risk of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: SD51/IMGH < 0.52; SD51 is the maximum effective half-diameter of the object-side surface 51 of the fifth lens L5, and IMGH is half the image height corresponding to the maximum field angle of the optical lens system 100.

By defining the ratio of the maximum effective half aperture of the object-side surface 51 of the fifth lens L5 to the image height corresponding to the maximum field angle of the optical lens 100, the maximum effective half aperture of the object-side surface 51 of the fifth lens L5 can be constrained within a reasonable range, thereby achieving a compact design of the optical lens 100. Secondly, when satisfying above-mentioned relational expression, the lifting distance of the marginal light through fifth lens L5 is suitable to when optical lens 100 is applied to the module of making a video recording, can keep the incident angle that the light that passes through optical lens 100 and the photosensitive chip of the module of making a video recording suitable, avoid the incident angle too big and cause photosensitive chip's matching difficulty. In addition, when the above relation is satisfied, the lifting distance of the light is appropriate, and a reasonable beam aperture is provided for the marginal light, so that the optical lens 100 provides reasonable relative illumination while realizing a light and thin design, and avoids generating a dark angle.

In some embodiments, the optical lens 100 satisfies the following relationship: f23/f is more than 1.4 and less than 2.2; where f23 is the combined focal length of the second lens L2 and the third lens L3, and f is the effective focal length of the optical lens 100.

By restricting the ratio of the combined focal length of the second lens L2 and the third lens L3 to the effective focal length of the optical lens 100, the focal powers of the second lens L2 and the third lens L3 can be properly distributed, and the third lens L3 can generate various cooperativeness, so that on the basis of satisfying the miniaturized design of the optical lens 100, the balance of the internal aberration of the optical lens 100 can be realized, thereby being helpful to adjust the curvature of field and the astigmatism of the imaging edge of the optical lens 100, and satisfying the imaging quality of the optical lens 100 to the surrounding environment.

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 according to the first embodiment of the present application includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are sequentially disposed along an optical axis O from an object side to an image side. The first lens L1 has positive focal power, the second lens L2 has positive focal power, the third lens L3 has positive focal power, the fourth lens L4 has positive focal power, and the fifth lens L5 has negative focal power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively convex and concave at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at the paraxial region O.

Further, the object-side surface 11 and the image-side surface 12 of the first lens L1 are both concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively concave and convex at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively concave and convex at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are respectively concave and convex at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

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 2.24mm, the f-number FNO of the optical lens 100 is 2.29, the maximum field angle FOV of the optical lens 100 is 127.17 °, and the total length TTL of the optical lens is 3.86 mm. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 correspond to the object side surface 11 and the image side surface 12 of the first lens L1, respectively. The Y radius in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis. The first value in the "thickness" parameter set of a lens is the thickness of the lens on the optical axis, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis. The numerical value of the diaphragm in the "thickness" parameter column is the distance on the optical axis from the diaphragm to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis), the direction from the object side surface of the first lens to the image side surface of the last lens is the positive direction of the optical axis by default, when the value is negative, the diaphragm is arranged on the image side of the vertex of the next surface, and if the thickness of the diaphragm is a positive value, the diaphragm is arranged on the object side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the refractive index, Abbe number, and focal length in Table 1 were obtained at a reference wavelength of 587.6 nm.

Further, in the first lens L1 to the sixth lens L6, each of the lenses is an aspheric lens, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis O direction; c is the curvature at the optical axis O of the aspheric surface, c ═ 1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is the cone coefficient; ai is a correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the first embodiment.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a graph of longitudinal spherical aberration of the optical lens 100 in the first embodiment at 470.0nm, 510.0nm, 587.6nm, 610.0nm, and 650.0 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

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

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

Second embodiment

A schematic structural diagram of an optical lens 100 disclosed in the second embodiment of the present application is shown in fig. 3, where the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are sequentially disposed from an object side to an image side along an optical axis O. The first lens L1 has positive focal power, the second lens L2 has positive focal power, the third lens L3 has negative focal power, the fourth lens L4 has positive focal power, and the fifth lens L5 has negative focal power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens L1 are both concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively concave and convex at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively convex and concave at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are respectively concave and convex at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

Specifically, other parameters of the optical lens 100 are given in table 3 below, taking as an example that the effective focal length f of the optical lens 100 is 2.32mm, the f-number FNO of the optical lens 100 is 2.18, the field angle FOV of the optical lens 100 is 124.49 °, and the total length TTL of the optical lens is 4.05 mm. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 3 are all mm. And the refractive index, Abbe number, and focal length in Table 3 were obtained at a reference wavelength of 587.6 nm. Table 4 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the second embodiment.

TABLE 3

TABLE 4

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

Third embodiment

A schematic structural diagram of an optical lens 100 disclosed in the third embodiment of the present application is shown in fig. 5, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3, which are sequentially disposed along an optical axis O from an object side to an image side, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are sequentially disposed along the optical axis O from the object side to the image side. The first lens L1 has positive focal power, the second lens L2 has positive focal power, the third lens L3 has negative focal power, the fourth lens L4 has positive focal power, and the fifth lens L5 has negative focal power.

Specifically, other parameters of the optical lens 100 are given in table 5 below, taking as an example that the effective focal length f of the optical lens 100 is 2.23mm, the f-number FNO of the optical lens 100 is 2.08, the field angle FOV of the optical lens 100 is 127.74 °, and the total length TTL of the optical lens is 4.10 mm. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 5 are mm. And the refractive index, Abbe number, and focal length in Table 5 were obtained at a reference wavelength of 587.6 nm. Table 6 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the third embodiment.

TABLE 5

TABLE 6

Referring to fig. 6, as shown in the graph of (a) the longitudinal spherical aberration, (B) the astigmatism, and (C) the distortion of fig. 6, the longitudinal spherical aberration, the astigmatism, and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fourth embodiment

A schematic structural diagram of an optical lens 100 disclosed in the fourth embodiment of the present application is shown in fig. 7, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3, which are sequentially disposed along an optical axis O from an object side to an image side, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are sequentially disposed along the optical axis O from the object side to the image side. The first lens L1 has positive focal power, the second lens L2 has positive focal power, the third lens L3 has negative focal power, the fourth lens L4 has negative focal power, and the fifth lens L5 has positive focal power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex, respectively, at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at the paraxial region O.

Specifically, other parameters of the optical lens 100 are given in table 7 below, taking as an example that the effective focal length f of the optical lens 100 is 2.23mm, the f-number FNO of the optical lens 100 is 2.39, the field angle FOV of the optical lens 100 is 126.28 °, and the total length TTL of the optical lens is 3.90 mm. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. And the refractive index, Abbe number, and focal length in Table 7 were obtained at a reference wavelength of 587.6 nm. Table 8 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fourth embodiment.

TABLE 7

TABLE 8

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

Fifth embodiment

A schematic structural diagram of an optical lens 100 disclosed in the fifth embodiment of the present application is shown in fig. 9, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3, which are sequentially disposed along an optical axis O from an object side to an image side, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are sequentially disposed along the optical axis O from the object side to the image side. The first lens L1 has positive focal power, the second lens L2 has positive focal power, the third lens L3 has negative focal power, the fourth lens L4 has negative focal power, and the fifth lens L5 has positive focal power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave, respectively, at a paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both concave at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at the paraxial region O.

Further, the object-side surface 11 and the image-side surface 12 of the first lens L1 are both concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively concave and convex at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively concave and convex at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both concave at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

Specifically, taking the effective focal length f of the optical lens 100 as 2.46mm, the f-number FNO of the optical lens 100 as 2.19, the field angle FOV of the optical lens 100 as 111.19 °, and the total length TTL of the optical lens as 3.78mm as examples, the other parameters of the optical lens 100 are given in table 9 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm. And the refractive index, Abbe number, and focal length in Table 9 were obtained at a reference wavelength of 587.6 nm. Table 10 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the fifth embodiment.

TABLE 9

Watch 10

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

Sixth embodiment

A schematic structural diagram of an optical lens 100 disclosed in a sixth embodiment of the present application is as shown in fig. 11, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3, which are sequentially disposed along an optical axis O from an object side to an image side, and the optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are sequentially disposed along the optical axis O from the object side to the image side. The first lens L1 has positive focal power, the second lens L2 has positive focal power, the third lens L3 has positive focal power, the fourth lens L4 has positive focal power, and the fifth lens L5 has negative focal power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and convex, respectively, at a paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave, respectively, at a paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex, respectively, at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at the paraxial region O.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave, respectively, at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively concave and convex at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively concave and convex at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are respectively concave and convex at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference.

Specifically, other parameters of the optical lens 100 are given in table 11 below, taking as an example that the effective focal length f of the optical lens 100 is 2.14mm, the f-number FNO of the optical lens 100 is 1.99, the field angle FOV of the optical lens 100 is 130.72 °, and the total length TTL of the optical lens is 3.75 mm. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 11 are mm. And the refractive index, Abbe number, and focal length in Table 11 were obtained at a reference wavelength of 587.6 nm. Table 12 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical lens in the sixth embodiment.

TABLE 11

TABLE 12

Referring to fig. 12, as can be seen from the graph of (a) longitudinal spherical aberration, (B) astigmatism and (C) distortion in fig. 12, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 12 (a), fig. 12 (B), and fig. 12 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Referring to table 13, table 13 summarizes ratios of the relations in the first embodiment to the sixth embodiment of the present application.

Watch 13

Referring to fig. 13, the present application further discloses a camera module 200, which includes a photo sensor 201 and the optical lens 100 according to any of the first to sixth embodiments, wherein the photo sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 is configured to receive an optical signal of a subject and project the optical signal to the photosensitive chip 201, and the photosensitive chip 201 is configured to convert the optical signal corresponding to the subject into an image signal, which is not described herein again. It can be understood that the camera module 200 having the optical lens 100 can achieve an ultra-wide angle imaging effect on the basis of considering the miniaturization and light-weight design of the optical lens, so as to improve the imaging quality of the optical lens 100. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 14, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a housing 301 and the camera module 200, and the camera module 200 is disposed on the housing 301. The electronic device 300 may be, but not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, a car recorder, a car backing image, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the imaging effect of the ultra-wide angle can be achieved while considering the miniaturization and the light weight design of the optical lens, so as to improve the imaging quality of the optical lens 100. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present application are introduced in detail, and a specific example is applied to explain the principle and the implementation of the present application, and the description of the embodiments is only used to help understand 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 application, there may be variations in the specific embodiments and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An optical lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in this order from an object side to an image side along an optical axis;

the third lens has optical power;

the optical lens satisfies the following relation:

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

0.8＜|f4/R42|＜8.8；

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

85°＜FOV*IMGH/TTL＜110°；

the FOV is the maximum field angle of the optical lens, the TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, and the IMGH is half of the image height corresponding to the maximum field angle of the optical lens.

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

0.32mm＜CT1+CT12＜0.45mm；

wherein CT1 is a thickness of the first lens element along the optical axis, and CT12 is a distance from an image-side surface of the first lens element to an object-side surface of the second lens element along the optical axis.

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

1.0＜|f1/f5|＜17；

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

0.18＜FFL/TTL＜0.24；

wherein, FFL is the shortest distance between the image side surface of the fifth lens element and the imaging surface of the optical lens along the optical axis, and TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens along the optical axis.

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

0.52＜SD51/IMGH＜0.78；

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

1.4＜f23/f＜2.2；

9. The utility model provides a module of making a video recording which characterized in that: the image pickup module comprises a photosensitive chip and the optical lens of any one of claims 1 to 8, wherein the photosensitive chip is arranged on the image side of the optical lens.

10. An electronic device, characterized in that: the electronic device comprises a housing and the camera module of claim 9, the camera module being disposed on the housing.