CN113933964A

CN113933964A - Optical lens, camera module and electronic equipment

Info

Publication number: CN113933964A
Application number: CN202111191006.8A
Authority: CN
Inventors: 张文燕; 邹金华; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-01-14
Anticipated expiration: 2041-10-13
Also published as: CN113933964B

Abstract

The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens with positive focal power, which is sequentially arranged from an object side to an image side along an optical axis, and the object side surface and the image side surface of the first lens are convex surfaces; a focusing structure; a second lens element with negative focal power, wherein the object-side surface is convex and the image-side surface is concave; the object side surface of the third lens is a concave surface, and the image side surfaces of the third lens are convex surfaces; a fourth lens having a focal power, an object side surface of which is concave; the fifth lens with focal power has a convex object-side surface and a concave image-side surface. The optical lens further satisfies the relation: 1< T1/T2< 3. By adopting the optical lens, the camera module and the electronic equipment, the design requirements of wide view, small distortion and quick focusing can be realized, and the imaging quality is improved.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the continuous improvement of the pursuit of the imaging quality of the camera, the wide view, the small distortion and the fast focusing of the optical lens become a great trend of the improvement of the optical lens technology. However, in the related art, how to achieve the characteristics of wide view, small distortion and fast focusing of the optical lens, so as to improve the imaging quality of the optical lens, a technical problem to be solved is still needed.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the design requirements of wide view, small distortion and quick focusing of the optical lens and improve the imaging quality of the optical lens.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, 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 convex at a paraxial region;

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

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

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

the optical lens further comprises a focusing structure, and the focusing structure is arranged between the first lens and the second lens;

the optical lens satisfies the following relation: 1< T1/T2< 3;

when the T1 is converted from the normal state to the near focus state, the image-side surface of the first lens reaches the object-side surface of the focusing layer of the focusing structure at the distance variation on the optical axis, and when the T2 is converted from the normal state to the far focus state, the image-side surface of the first lens reaches the object-side surface of the focusing layer of the focusing structure at the distance variation on the optical axis. Specifically, the normal state means an object distance of 400mm, the near focus state means an object distance of 150mm, and the far focus state means an object distance of 1200 mm.

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

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

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

according to the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the first lens with positive focal power is adopted, and the object side surface and the image side surface of the first lens are convex surfaces at the position close to the optical axis, so that the light rays emitted into the optical lens can be favorably collected. The second lens has negative focal power, the object side surface of the second lens is a convex surface at a paraxial region, and the image side surface of the second lens is a concave surface at the paraxial region, so that light rays which are collected by the first lens and enter the optical lens can be favorably diverged, and the requirement of high image quality of the optical lens can be met. Through mutually supporting of first lens and second lens, can effectively compress optical lens's volume, when realizing optical lens miniaturized design, can also realize rectifying optical lens's aberration, curvature of field. The third lens has positive focal power, the object side surface of the third lens is a concave surface at a paraxial region, and the image side surface of the third lens is a convex surface at the paraxial region, so that the optical path difference of the optical lens can be effectively balanced, the design requirements of correcting curvature of field and smoothing distortion of an external field of view can be realized, and the distortion generated by the optical lens can be reduced. The object side surface of the fourth lens is a concave surface at a position near the optical axis, so that the field range of the optical lens can be expanded, and the design requirement of the optical lens on wide view can be met. The object-side surface of the fifth lens element is convex at the paraxial region thereof, and the image-side surface of the fifth lens element is concave at the paraxial region thereof, so that aberrations generated by the first to fourth lens elements can be corrected, thereby promoting the aberration balance of the optical lens assembly and further improving the resolving power of the optical lens assembly, thereby improving the imaging quality of the optical lens assembly. The utility model provides an optical lens has still set up the focusing structure between first lens and second lens to the focusing structure can be according to different shooting state quick adjustment focuses, and then the focal power variation of control focusing structure realizes optical lens auto focus's function, is favorable to satisfying under the requirement of miniaturized design, realizes the quick focusing effect to optical lens, thereby promotes optical lens's imaging quality. Further, the optical lens satisfies the relation: 1< T1/T2<3, when the above relational expression is satisfied, the fine change of the focusing layer can cause the fine focal power change of the optical lens, so that when the shot object changes in the range of the near focus and the far focus, the optical lens can quickly change the focal length to realize optical focusing, the whole imaging surface of the optical lens is clear and uniform, and the imaging quality of the optical lens is improved. That is to say, the optical lens provided by the invention can meet the design requirements of wide view, small distortion and quick focusing of the optical lens, and is beneficial to improving the imaging quality of the optical lens.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a bending degree of a focusing structure without voltage according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a bending degree of a focusing structure under a 10V voltage according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a bending degree of a focusing structure under a voltage of 30V according to an embodiment of the present invention;

fig. 5 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%), of an optical lens in a close-focus state according to an embodiment of the present invention;

fig. 6 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of an optical lens in a middle focus state according to an embodiment of the present invention;

fig. 7 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%), of an optical lens in an afocal state according to an embodiment of the present invention;

fig. 8 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%), of an optical lens at an infinite focal length state according to an embodiment of the present invention;

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

fig. 10 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%), of the optical lens in the near-focus state according to the second embodiment of the present invention;

fig. 11 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens in the middle focus state according to the second embodiment of the present invention;

fig. 12 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%), of the optical lens in the afocal state according to the second embodiment of the present invention;

fig. 13 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%), of the optical lens according to the second embodiment of the present invention, at an infinite focal length;

fig. 14 is a schematic structural diagram of an optical lens disclosed in the third embodiment of the present invention;

fig. 15 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%);

fig. 16 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of an optical lens in a middle focus state according to a third embodiment of the present invention;

fig. 17 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 18 is a light beam spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%), of the optical lens disclosed in the third embodiment of the present invention, in a focal length infinite state;

fig. 19 is a schematic structural diagram of an optical lens disclosed in the fourth embodiment of the present invention;

fig. 20 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens in the near-focus state according to the fourth embodiment of the present invention;

fig. 21 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 22 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 23 is a light beam spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 24 is a schematic structural diagram of an optical lens disclosed in the fifth embodiment of the present invention;

fig. 25 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens in the near-focus state according to the fifth embodiment of the present invention;

fig. 26 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens in the middle focus state according to the fifth embodiment of the present invention;

fig. 27 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%);

fig. 28 is a light beam spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens system according to the fifth embodiment of the present invention in the state of the focal length at infinity;

fig. 29 is a schematic structural diagram of an optical lens disclosed in the sixth embodiment of the present invention;

fig. 30 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of an optical lens in a close-focus state according to a sixth embodiment of the present invention;

fig. 31 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 32 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 33 is a light beam spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 34 is a schematic structural diagram of an optical lens disclosed in the seventh embodiment of the present invention;

fig. 35 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens system in the near-focus state according to the seventh embodiment of the present invention;

fig. 36 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens system in the middle focus state according to the seventh embodiment of the present invention;

fig. 37 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%);

fig. 38 is a light spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 39 is a schematic structural diagram of an optical lens disclosed in the eighth embodiment of the present invention;

fig. 40 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%);

fig. 41 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens system in the middle focus state according to the eighth embodiment of the present invention;

fig. 42 is a light spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%);

fig. 43 is a light beam spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens system according to the eighth embodiment of the present invention in the state of the focal length at infinity;

FIG. 44 is a schematic structural diagram of a camera module according to the present disclosure;

fig. 45 is a schematic structural diagram of an electronic device disclosed in the present invention.

Detailed Description

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

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

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

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

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

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

Referring to fig. 1, according to a first aspect of the present invention, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, which are sequentially disposed from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the focusing structure 60, 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 finally forms an image on the imaging surface 101 of the optical lens 100. The first lens L1 has negative focal power, the second lens L2 has negative focal power, the third lens L3 has positive 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 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O, the object-side surface 11 of the first lens element L1 is concave at the circumference, and the image-side surface 12 of the first lens element L1 is convex at the circumference; the object-side surface 21 of the second lens element L2 is convex at the paraxial region O, the image-side surface 22 of the second lens element L2 is concave at the paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the periphery; the object-side surface 31 of the third lens element L3 is concave at the paraxial region O, the image-side surface 32 of the third lens element L3 is convex at the paraxial region O, the object-side surface 31 of the third lens element L3 is convex at the circumference, and the image-side surface 32 of the third lens element L3 is concave at the circumference; the object-side surface 41 of the fourth lens element L4 is concave at the paraxial region O, and the object-side surface 41 of the fourth lens element L4 is concave at the periphery; the object-side surface 51 of the fifth lens element L5 is convex at the paraxial region O, the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region O, and the image-side surface 52 of the fifth lens element L5 is convex at the periphery.

Optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may all be plastic lenses, so that the complex surface shape of the lenses can be easily processed while the optical lens 100 is light and thin. Alternatively, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may also be glass lenses, so that the optical lens 100 has a good optical effect and the temperature sensitivity of the optical lens 100 may also be reduced. Of course, a part of the lenses may be glass lenses, and a part of the lenses may be plastic lenses, which may be adjusted according to actual situations, and this embodiment is not limited in this respect.

Alternatively, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be spherical lenses or aspherical lenses. It is understood that one aspheric lens can achieve the effect of correcting phase difference of a plurality of spherical lenses. That is, the aspheric lens can correct the phase difference and reduce the number of lenses, which is beneficial to meeting the requirement of miniaturization of the optical lens 100 and improving the imaging quality. The specific number of the spherical lenses and the aspherical lenses may be set according to practical situations, for example, the first lens L1 is a spherical lens, and the remaining lenses are aspherical lenses, or the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all aspherical lenses, and the embodiment is not particularly limited.

As shown in connection with fig. 2, the focusing structure 60 is disposed between the first lens L1 and the second lens L2. Because the focusing structure 60 can adjust the focal length rapidly according to different shooting states, and then control the focal power variation of the focusing structure 60, realize the function of optical lens 100 auto focus, be favorable to satisfying under the requirement of miniaturized design, realize the quick focusing effect to optical lens 100 to promote optical lens 100's imaging quality.

In some embodiments, the focusing mechanism 60 is an adjustable lens T-lens module, and the focusing mechanism 60 is configured to achieve focusing based on a control voltage. Specifically, the focusing structure 60 includes a peripheral package circuit (not shown) including a driving chip for providing a control voltage to drive the T-lens core unit by the control voltage provided by the driving chip, and a T-lens core unit. More specifically, the T-lens core member includes a substrate 61, a protective film 62, a focusing layer 63, and a piezoelectric actuator 64, which are disposed in this order from the object side to the image side along the optical axis O. The substrate 61 has an object side surface 61a and an image side surface 61b, the protective film 62 is attached to the object side surface 61a of the substrate 61, the focusing layer 63 has an object side surface 63a and an image side surface 63b, the image side surface 63b of the focusing layer 63 is attached to the protective film 62, the piezoelectric actuator 64 is disposed on the object side surface 63a of the focusing layer 63, and the piezoelectric actuator 64 is used for electrifying the focusing layer 63.

Optionally, the focusing layer 63 may be a piezoelectric layer or a flexible layer internally wrapped with optical liquid, that is, the focusing structure 60 may be a piezoelectric focusing structure or a liquid focusing structure. When the focusing layer 63 is a piezoelectric layer, the atomic cells of the piezoelectric layer material are elongated due to the electric field force acting on the material of the piezoelectric layer in the direction of the electric field, and when a large number of atomic cells are elongated microscopically and accumulated to a certain amount, the material of the piezoelectric layer macroscopically shows the deformation of the material of the piezoelectric layer. Since the deformation of the piezoelectric layer material is caused by the atomic cell deformation, the piezoelectric layer material has a larger thrust than driving devices such as a focusing motor, and the like, and has a faster response speed and higher action precision, thereby being beneficial to realizing the effect of quickly focusing the optical lens 100. When focusing layer 63 is the flexible layer of interior parcel optical liquid, owing to be equipped with the extrusion ring in the both sides of flexible layer, drive chip drives the surface of extrusion ring extrusion flexible layer, makes its surface curvature radius change, and then realizes the effect of optical lens 100 quick focusing.

That is to say, the focusing structure 60 can adjust the focal length of the focusing structure 60 according to different voltages, and then control the variation of the focal power of the focusing structure 60, so as to achieve the function of automatic focusing, which is beneficial to realizing the focusing effect of the optical lens 100 on the premise of miniaturization, and improving the imaging quality of the optical lens 100. In addition, since the focusing structure 60 is based on voltage control to realize focusing, a motor is not needed in the focusing process, and magnetic interference is not generated.

Referring to fig. 2 to 4, fig. 2 to 4 show the deformation of the focusing structure 60 under the action of voltages of 0V, 10V and 30V. As can be seen from fig. 2 to 4, the larger the voltage applied to the focusing structure 60, the larger the amount of deformation of the focusing structure 60, the larger the focal power of the focusing structure 60, and the smaller the focal length. Therefore, by adjusting the voltage applied to the focusing structure 60, the design requirement of fast focusing of the optical lens can be achieved.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop 102 and/or a field stop 102, which may be disposed on the object side 11 side of the first lens L1 of the optical lens 100. It is understood that, in other embodiments, the stop 102 may be disposed at other positions, for example, between the image-side surface 12 of the first lens L1 and the object-side surface 21 of the second lens L2, and the arrangement may be adjusted according to practical situations, and the present embodiment is not limited in particular.

In some embodiments, the optical lens 100 further includes an optical filter 70, and the optical filter 70 is disposed between the fifth lens element L5 and the image plane 101 of the optical lens 100. Optionally, the optical filter 70 may be an infrared filter, so that infrared light can be filtered, the imaging quality is improved, and the imaging better conforms to the visual experience of human eyes. It is understood that the optical filter 70 may be made of an optical glass coating film or a colored glass, and the optical filter may be selected according to actual needs, and the embodiment is not limited in particular.

In some embodiments, the focusing structure 60 includes a focusing layer 63, and the optical lens 100 satisfies the following relation: 1< T1/T2< 3; t1 is the distance variation on the optical axis O from the image-side surface 12 of the first lens L1 to the object-side surface 63a of the focusing layer 63 of the focusing structure 60 when the normal state is converted into the close-focus state, and T2 is the distance variation on the optical axis O from the image-side surface 12 of the first lens L1 to the object-side surface 63a of the focusing layer 63 of the focusing structure 60 when the normal state is converted into the far-focus state. Specifically, the normal state refers to a state in which the object distance is 400mm, the near focus state refers to a state in which the object distance is 150mm, and the far focus state refers to a state in which the object distance is 1200 mm. Since the focus structure 60 can adjust the focal length of the focus structure 60 according to different voltages, the variation of the focal power of the focus structure 60 can be controlled. When the above relationship is satisfied, the fine change of the focusing layer 63 can cause the fine focal power change of the optical lens 100, so that when the shot object changes in the range of the near focus and the far focus, the optical lens 100 can quickly change the focal length to realize optical focusing, the whole imaging surface 101 is clear and uniform, and the imaging quality of the optical lens 100 is further improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.1< air 1/TTL < 0.2; wherein, air L1 is the distance on the optical axis O from the image-side surface 12 of the first lens element L1 to the object-side surface 21 of the second lens element L2, and TTL is the distance on the optical axis O from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens system 100 (i.e., the total length of the optical lens system). In consideration of the fact that the focusing structure 60 is located between the first lens L1 and the second lens L2, in order to ensure that the ratio of the distance from the image-side surface 12 of the first lens L1 to the object-side surface 21 of the second lens L2 on the optical axis O to the total length (i.e., TTL) of the optical lens 100 is controlled within a suitable range in order to facilitate the setting of the focusing structure 60 while ensuring the performance parameters of the optical lens 100. When the above relational expression is satisfied, a sufficiently large space is provided between the first lens L1 and the second lens L2, enabling the focusing mechanism 60 to be mounted in the optical lens 100. When air L1/TTL is less than or equal to 0.1, there is not enough space between the first lens L1 and the second lens L2 to mount the focusing structure 60. When air 1/TTL is equal to or greater than 0.2, although the focusing structure 60 can be mounted, the air gap between the second lens L2 to the fifth lens L5 is excessively compressed, so that the total air gap of the lenses is excessively small relative to the total length, which may cause the overall resolution of the optical lens 100 to be degraded, resulting in blurred imaging of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2< TTL/EFL < 1.65; where EFL is the effective focal length of the optical lens 100. When the above relation is satisfied, the effective focal length of the optical lens 100 and the total length of the optical lens 100 are appropriate, and the design requirements of miniaturization, wide angle, large depth of field and high imaging quality of the optical lens 100 can be realized. When TTL/EFL is less than or equal to 1.2, the total length of the optical lens 100 is too short, the optical lens 100 has high sensitivity, which is not favorable for light to converge on the imaging surface 101 of the optical lens 100, and the effective focal length of the optical lens 100 is larger than the total length of the optical lens 100, which results in a shallow depth of field and affects the imaging quality of the optical lens 100. When TTL/EFL is greater than or equal to 1.65, the total length of the optical lens 100 is too long, such that the overall size of the optical lens 100 is increased, which is not favorable for the design requirement of miniaturization, and meanwhile, the field angle of light entering the optical lens 100 is decreased, which is not favorable for the design requirement of wide angle of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< FBL/EFL < 0.3; wherein, FBL is the shortest distance from the image-side surface 52 of the fifth lens element L5 to the image plane 101 in the direction of the optical axis O. When the above relation is satisfied, the optical lens 100 can satisfy the miniaturization and ensure that the optical lens 100 has a sufficient focusing range, so as to improve the assembly yield of the optical lens 100, and in addition, the design requirement of the optical lens 100 with a large focal depth can be realized, and more depth information of the object side can be acquired. When FBL/EFL is less than or equal to 0.2, the assembly yield of the optical lens 100 is too low, which increases the difficulty of the production process, and the depth of focus of the optical lens 100 cannot be ensured, which results in poor imaging quality of the optical lens 100; when the FBL/EFL is greater than or equal to 0.3, the effective focal length of the optical lens 100 is too small, resulting in too deep depth of field of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.7< EFL/Imgh < 1.2; where Imgh is the radius of the maximum effective imaging circle of the optical lens 100. When the optical lens 100 is designed as a wide-angle large image plane lens, the optical lens 100 has a larger field angle and image plane than a standard lens, and since the wide-angle lens has a smaller focal length than a normal lens, the optical lens 100 with a larger depth of field can not only achieve the design purpose of wide view, but also achieve the high-definition shooting experience of far and near objects while having an oversized image plane. Therefore, the ratio of the effective focal length to the image plane of the optical lens 100 needs to be controlled within a certain range, so as to meet the design requirements of the optical lens 100 for wide view and high imaging quality. When the EFL/Imgh is less than or equal to 0.7, the effective focal length of the optical lens 100 is reduced while ensuring a large image plane, which leads to the fact that the field angle of the lens exceeds the maximum range of the field angle of the lens, and the lens cannot be produced and processed; when the EFL/Imgh is greater than or equal to 1.2, the effective focal length of the optical lens 100 needs to be increased while ensuring a large image plane, which results in an enlarged structure of the optical lens 100 and a shallow depth of field, which does not meet the design requirement of miniaturization of the optical lens 100, and which results in poor quality of long-range shooting and imaging.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< EFL/f1< 1.5; where f1 is the effective focal length of the first lens L1. Since the first lens L1 has positive power, the light entering the optical lens 100 is well converged. Further, the focal length of the first lens L1 determines the field angle size of the optical lens 100. When the field angle of the optical lens 100 is greater than 86 °, if the effective focal length of the optical lens 100 is not properly matched with the focal length of the first lens L1, the optical lens 100 is distorted too much, the imaging quality is reduced, the sensitivity of the optical lens 100 is increased, and the processing is difficult. Therefore, when the above relation is satisfied, the fitting ratio of the effective focal length of the optical lens 100 to the focal length of the first lens L1 is appropriate, and the distortion generated by the optical lens 100 can be effectively corrected, thereby ensuring the imaging quality and the workability of the optical lens 100. If EFL/f1 is less than or equal to 1, it is not favorable to achieve the design requirement of wide view of the optical lens 100. When EFL/f1 is greater than or equal to 1.5, the image of the optical lens 100 is curved, and the image quality of the optical lens 100 is poor.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< | f1/f2| < 0.6; wherein f2 is the effective focal length of the second lens L2. The first lens L1 has a positive optical power, and facilitates the collection of light. The second lens L2 has negative focal power, and can diverge the light passing through the first lens L1, thereby satisfying the requirement of the optical lens 100 for high image quality. The combination of the first lens L1 and the second lens L2 not only can effectively compress the volume of the optical lens 100 to meet the design requirement of miniaturization, but also can well correct the aberration and curvature of field of the whole optical lens 100. Therefore, by limiting the ratio between the focal length of the first lens L1 and the focal length of the second lens L2 to a certain range, the foregoing effects can be achieved well. Meanwhile, when the above relational expression is satisfied, the total length of the optical lens 100 can be reduced, and the design requirement for miniaturization can be achieved.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.25< ETL3/CTL3< 0.5; the ETL3 is a distance along the optical axis O from the maximum effective half-aperture of the object-side surface 31 of the third lens L3 to the maximum effective half-aperture of the image-side surface 32 of the third lens L3, and the CTL3 is a thickness of the third lens L3 on the optical axis O. The third lens L3 is designed to have a thin edge and a thick center, which is beneficial to correcting distortion and curvature of field generated by the optical lens 100, balancing the optical path difference of the optical lens 100, and achieving the purpose of correcting curvature of field and smoothing distortion of the external field of view of the optical lens 100. If the edge thickness of the third lens L3 is too thin, the requirements of production process and molding yield cannot be met. If the center thickness of the third lens element L3 is too thin or too thick, it is difficult for the center light rays and the edge light rays to converge near the image plane 101 of the optical lens 100, resulting in excessive curvature of field of the optical lens 100. Therefore, in order to achieve the above object, the ratio of the distance along the optical axis O between the maximum effective semi-caliber of the object-side surface 31 of the third lens L1 and the maximum effective semi-caliber of the image-side surface 32 of the third lens L3 to the thickness of the third lens L3 on the optical axis O needs to be controlled within a certain range, that is, the ratio of the edge thickness to the center thickness of the third lens L3 needs to be controlled within a certain range. When the above relational expression is satisfied, the third lens L3 can correct distortion and curvature of field generated by the optical lens 100, and balance the optical path difference of the optical lens 100, thereby achieving the purpose of correcting curvature of field of the optical lens 100 and smoothing distortion of the external field of view. When the ETL3/CTL3 is less than or equal to 0.25, the center thickness of the third lens L3 is too thick relative to the edge thickness, so that the edge thickness of the third lens L3 is too thin, and the production process forming yield of the third lens L3 is reduced. When ETL3/CTL3 is greater than or equal to 0.5, the central thickness of the third lens element L3 is too thin relative to the peripheral thickness, which tends to cause the field curvature of the image plane 101 of the optical lens 100 to be too large, and the distortion of the optical lens 100 is large, the peripheral field image is distorted, and the image quality is not good.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2< DL5/DL4< 1.4; wherein DL5 is the maximum effective aperture of the image-side surface 52 of the fifth lens element L5; DL4 is the maximum effective aperture of the image-side surface 42 of the fourth lens element L4. Because the effective diameter of the fifth lens L5 determines the imaging height of the optical lens 100, the effective diameters of the fourth lens L4 and the fifth lens L5 are matched with each other, so that light can be well transmitted through the fourth lens L4 and the fifth lens L5, and the problem that the imaging quality of the optical lens 100 is affected due to the fact that the light with an excessively large angle is incident on the surface of the lens and is totally reflected or the light is too steep is avoided. In addition, the ratio of the effective diameter of the fifth lens L5 to the effective diameter of the fourth lens L4 is controlled within a certain range, so that light can enter the imaging surface of the optical lens 100 at a proper angle, and the imaging quality of the optical lens 100 is improved. When DL5/DL4 is less than or equal to 1.2, the effective diameter of the fifth lens element L5 is too small compared with the effective diameter of the fourth lens element L4, and the exit angle of the light passing through the fourth lens element L4 and the fifth lens element L5 is too small, so that the angle of the light reaching the imaging surface 101 of the optical lens 100 is too small, and the matching degree of the light with the chips on the imaging surface 101 of the optical lens 100 is poor. When DL5/DL4 is greater than or equal to 1.4, the effective diameter of the fifth lens element L5 is too large compared with the effective diameter of the fourth lens element L4, so that the angle from the fourth lens element L4 to the fifth lens element L5 is too large, and the edge lines cannot reach the image plane 101 of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 86 ° < FOV <102 °; where FOV is the angle of view of the optical lens 100. When the above relation is satisfied, the design requirement of the optical lens 100 for wide view can be satisfied, so that the optical lens 100 can shoot a large-area scene.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5< rad (fov)/fno < 1; where rad (fov) is an arc value of the maximum field angle of the optical lens 100, and fno is an f-number of the optical lens 100. When the above relation is satisfied, the optical lens 100 can satisfy design requirements of miniaturization, wide view, and high imaging quality. When rad (fov)/fno is less than or equal to 0.5, the effective aperture of the first lens L1 is reduced due to an excessively large f-number of the optical lens 100, and the light flux of the optical lens 100 is insufficient, so that the edge light enters the optical lens 100 to cause edge blurring and the imaging quality of the optical lens 100 is poor. When rad (fov)/fno is greater than or equal to 1, the maximum field angle of the optical lens 100 is too large and does not match the effective diameter of the first lens L1, and the light blocking of the edge rays occurs.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.4mm^-1<fno/Imgh<0.9mm^-1(ii) a Where fno is the f-number of the optical lens 100, and Imgh is the radius of the maximum effective imaging circle of the optical lens 100. Since the f-number of the optical lens 100 determines the amount of light passing through the optical lens 100, the radius of the maximum effective imaging circle of the optical lens 100 determines the image sharpness and the pixel size of the optical lens 100. Therefore, the relationship between the two is limited reasonably to ensure that the optical lens 100 has enough light transmission amount and ensure the imaging definition. When the above relational expression is satisfied, the optical lens 100 has a sufficient light flux amount and high imaging sharpness. When fno/Imgh is less than or equal to 0.4, the f-number of the optical lens 100 is too small, which causes over exposure and high brightness, and affects the imaging quality of the optical lens 100; when fno/Imgh is greater than or equal to 0.9, the aperture of the optical lens 100 is too large, resulting in insufficient light transmission, and when the light brightness is insufficient, the frame sensitivity of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: -0.6mm < (R7R 8)/(R7+ R8) < -0.1 mm; wherein R7 is a radius of curvature of the object-side surface 41 of the fourth lens element L4 along the optical axis O, and R8 is a radius of curvature of the image-side surface 42 of the fourth lens element L4 along the optical axis O. When the above relation is satisfied, the curvature radius of the object-side surface 41 of the fourth lens element L4 at the optical axis O and the curvature radius of the image-side surface 42 of the fourth lens element L4 at the optical axis O are suitable, and the fourth lens element L4 can reasonably balance the optical path difference between the marginal rays of the optical lens 100 and the rays near the optical axis O, and reasonably correct curvature of field and astigmatism, and at the same time, reduce the sensitivity of the optical lens 100 and improve the assembly stability of the optical lens 100.

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

Example one

As shown in fig. 1, the optical lens 100 according to the first embodiment of the present disclosure includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

Further, the first lens L1 has a positive power, the second lens L2 has a negative power, the third lens L3 has a positive power, the fourth lens L4 has a negative power, and the fifth lens L5 has a positive power.

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

Specifically, taking the effective focal length EFL of the optical lens 100 as 2.617mm/2.650mm/2.659mm/2.665mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in the near-focus state (i.e., the object distance is 150mm), the intermediate-focus state (i.e., the normal state, i.e., the object distance is 400mm), the far-focus state (i.e., the object distance is 1200mm), and the object distance is infinity, respectively. Specifically, in the near focus state, EFL is 2.617 mm; in the medium-focus state, EFL is 2.650 mm; in the afocal state, EFL is 2.659 mm; in the infinite object distance state, EFL is 2.665 mm. The aperture value fno of the optical lens 100 is 2.50, the field angle FOV of the optical lens 100 is 101.73 °, the total length TTL of the optical lens 100 is 4.26mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in table 1 below. 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 a curvature radius of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O, where the Y radius of the focus layer 63 is a curvature radius of the object-side surface 63a of the focus layer 63, and the Y radius of the protective film 62 is a curvature radius of the image-side surface 63b of the focus layer 63. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance from the stop 102 to the object-side surface 11 of the first lens element L1 on the optical axis O. The materials of the focusing layer 63 and the protective film 62 in table 1 are all high molecular polymers, and the high molecular polymers may be plastics, such as polyethylene plastics, poly-p-phthalic plastics, or polycarbonate plastics; the substrate 61 may be made of glass or Plastic, such as Polycarbonate Plastic (PC). It is understood that the units of the radius Y, the thickness, and the focal length in table 1 are all mm, and the refractive index and the abbe number in table 1 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 1 indicates the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.065mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.070 mm; in the object distance 1200mm state, the distance from the image side 12 of the first lens L1 to the object side 63a of the focusing layer 63 on the optical axis O is 0.072 mm; in the state of infinite object distance, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.073 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.270mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance 400mm, the thickness of the protective film 62 on the optical axis O is 0.265 mm; the thickness of the protective film 62 on the optical axis O is 0.263mm in the state of object distance 1200 mm; in the state of the object distance at infinity, the thickness of the protective film 62 on the optical axis O is 0.262 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 120mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; under the state of object distance of 1200mm, the curvature radius of the object side 63a of the focusing layer 63 is-295 mm; in the object distance infinity state, the radius of curvature of the object side surface 63a of the focusing layer 63 is 200 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 120mm in a state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; under the object distance of 1200mm, the curvature radius of the image side surface 63b of the focusing layer 63 is-295 mm; in the object distance infinity state, the radius of curvature of the image side surface 63b of the focusing layer 63 is 200 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 216.88mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-533.16 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-361.46 mm.

In the first embodiment, the object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric surfaces, and the surface type x of each aspheric surface lens can be defined by, but is not limited to, the following aspheric surface formula:

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

TABLE 1

TABLE 2

Referring to fig. 5, fig. 5 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 in a near-focus state (i.e., object distance is 150mm), specifically, referring to (a) in fig. 5, fig. 5 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm and 430nm, in (a) in fig. 5, an abscissa in an X-axis direction represents a focus offset, and an ordinate in a Y-axis direction represents a normalized field of view. As can be seen from fig. 5 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better. Referring to fig. 5 (B), fig. 5 (B) is a diagram of astigmatism of light of the optical lens 100 at a wavelength of 555nm according to the first embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 5 that astigmatism of the optical lens 100 is well compensated at this wavelength. Referring to fig. 5 (C), fig. 5 (C) is a distortion curve diagram of the optical lens 100 of the first embodiment at a wavelength of 555 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 5, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

Referring to fig. 6 to 8, as can be seen from the light spherical aberration graphs (a) in fig. 6 to 8, the light astigmatism graphs (B) in fig. 6 to 8, and the distortion graphs (C) in fig. 6 to 8, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled in the case of the middle focus (i.e., the object distance is 400mm), the far focus (i.e., the object distance is 1200mm), and the focal length is infinity (i.e., the object distance is infinity), so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 to 8 (a), 6 to 8 (B), and 6 to 8 (C), the contents described in fig. 5 (a), 5 (B), and 5 (C) can be referred to, and the details are not repeated herein.

Example two

As shown in fig. 9, the optical lens 100 according to the second embodiment of the present invention includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

Further, the first lens L1 has a positive power, the second lens L2 has a negative power, the third lens L3 has a positive power, the fourth lens L4 has a negative power, and the fifth lens L5 has a negative power.

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

Specifically, taking the effective focal length EFL of the optical lens 100 as 2.79mm/2.82mm/2.84mm/2.84mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in the near-focus state (i.e., the object distance is 150mm), the intermediate-focus state (i.e., the normal state, i.e., the object distance is 400mm), the far-focus state (i.e., the object distance is 1200mm), and the object distance infinity state, respectively. Specifically, in the near-focus state, EFL is 2.79 mm; in the medium-focus state, the EFL is 2.82 mm; in the afocal state, EFL is 2.84 mm; in the infinite object distance state, the EFL is 2.84 mm. The aperture value fno of the optical lens 100 is 2.30, the field angle FOV of the optical lens 100 is 98.16 °, the total length TTL of the optical lens 100 is 4.45mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in the following table 3, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which will not be described herein. It is understood that the units of the radius Y, thickness, and focal length in table 3 are mm, and the refractive index and abbe number in table 3 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 3 represents the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance from the image-side surface 12 of the first lens L1 to the object-side surface 63a of the focusing layer 63 on the optical axis O is 0.078mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, a distance from the image-side surface 12 of the first lens L1 to the object-side surface 63a of the focusing layer 63 on the optical axis O is 0.083 mm; in the object distance 1200mm state, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.086 mm; in the object distance infinity state, the distance from the image side 12 of the first lens L1 to the object side 63a of the focusing layer 63 on the optical axis O is 0.087 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.270mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance 400mm, the thickness of the protective film 62 on the optical axis O is 0.265 mm; under the state of object distance of 1200mm, the thickness of the protective film 62 on the optical axis O is 0.262 mm; in the state of the object distance at infinity, the thickness of the protective film 62 on the optical axis O is 0.261 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 130mm in a state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; under the state of object distance of 1200mm, the curvature radius of the object side 63a of the focusing layer 63 is-240 mm; in the object distance infinity state, the radius of curvature of the object-side surface 63a of the focusing layer 63 is-165 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 130mm in a state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; under the object distance 1200mm state, the curvature radius of the image side surface 63b of the focusing layer 63 is-240 mm; in the object distance infinity state, the radius of curvature of the image side 63b of the focusing layer 63 is-165 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 243.95mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-433.75 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-298.21 mm.

In the second embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing embodiments, which is not described herein again. Table 4 below shows the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 of each aspherical mirror surface used in example two.

TABLE 3

TABLE 4

Referring to fig. 10 to 13, as can be seen from the light spherical aberration graphs (a) in fig. 10 to 13, the light astigmatism graphs (B) in fig. 10 to 13, and the distortion graphs (C) in fig. 10 to 13, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 in the cases of the near focus (i.e., the object distance is 150mm), the middle focus (i.e., the object distance is 400mm), the far focus (i.e., the object distance is 1200mm), and the focal length is infinity (i.e., the object distance is infinity), so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 to 13 (a), fig. 10 to 13 (B), and fig. 10 to 13 (C), reference may be made to the contents described in fig. 5 (a), fig. 5 (B), and fig. 5 (C) in the first embodiment, and details thereof are not repeated here.

EXAMPLE III

As shown in fig. 14, the optical lens 100 according to the third embodiment of the present invention includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length EFL of the optical lens 100 as 2.77mm/2.80mm/2.81mm/2.82mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in the near-focus state (i.e., the object distance is 150mm), the intermediate-focus state (i.e., the normal state, i.e., the object distance is 400mm), the far-focus state (i.e., the object distance is 1200mm), and the object distance infinity state, respectively. Specifically, in the near-focus state, EFL is 2.77 mm; in the medium-focus state, EFL is 2.80 mm; in the afocal state, EFL is 2.81 mm; in the infinite object distance state, the EFL is 2.82 mm. The aperture value fno of the optical lens 100 is 2.09, the field angle FOV of the optical lens 100 is 98.56 °, the total length TTL of the optical lens 100 is 4.47mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in the following table 5, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 5 are mm, and the refractive index and the abbe number in table 5 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 5 represents the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance from the image-side surface 12 of the first lens L1 to the object-side surface 63a of the focusing layer 63 on the optical axis O is 0.039mm in the state where the object distance of the optical lens 100 is 150 mm; in the state of an object distance of 400mm, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.086 mm; in the object distance 1200mm state, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.089 mm; in the state of infinite object distance, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.090 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.312mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance 400mm, the thickness of the protective film 62 on the optical axis O is 0.265 mm; under the state of object distance of 1200mm, the thickness of the protective film 62 on the optical axis O is 0.262 mm; in the state of the object distance at infinity, the thickness of the protective film 62 on the optical axis O is 0.261 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 138mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; under the state of object distance of 1200mm, the curvature radius of the object side 63a of the focusing layer 63 is-220 mm; in the object distance infinity state, the radius of curvature of the object-side surface 63a of the focusing layer 63 is-160 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 138mm in a state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; under the object distance 1200mm state, the curvature radius of the image side surface 63b of the focusing layer 63 is-220 mm; in the object distance infinity state, the radius of curvature of the image side 63b of the focusing layer 63 is-160 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 249.41mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-397.61 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-298.17 mm.

In the third embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing embodiments, which is not described herein again. Table 6 below shows the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 of each aspherical mirror surface used in example three.

TABLE 5

TABLE 6

Referring to fig. 15 to 18, as can be seen from the spherical aberration curve chart of the light beam (a) in fig. 15 to 18, the astigmatism curve chart of the light beam (B) in fig. 15 to 18, and the distortion curve chart of the light beam (C) in fig. 15 to 18, the longitudinal spherical aberration, the astigmatism and the distortion of the optical system 100 are well controlled in the case of the near focus (i.e., the object distance is 150mm), the intermediate focus (i.e., the object distance is 400mm), the far focus (i.e., the object distance is 1200mm), and the focal length is infinity (i.e., the object distance is infinity), so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 15 to 18 (a), fig. 15 to 18 (B), and fig. 15 to 18 (C), reference may be made to the contents described in fig. 5 (a), fig. 5 (B), and fig. 5 (C) in the first embodiment, and details thereof are not repeated here.

Example four

Fig. 19 shows a schematic structural diagram of an optical lens 100 according to fourth embodiment of the present invention, where the optical lens 100 includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length EFL of the optical lens 100 as 2.90mm/2.93mm/2.96mm/2.96mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in the near-focus state (i.e., the object distance is 150mm), the intermediate-focus state (i.e., the normal state, i.e., the object distance is 400mm), the far-focus state (i.e., the object distance is 1200mm), and the object distance infinity state, respectively. Specifically, in the near-focus state, EFL is 2.90 mm; in the medium-focus state, EFL is 2.93 mm; in the afocal state, EFL is 2.96 mm; in the infinite object distance state, EFL is 2.96 mm. The aperture value fno of the optical lens 100 is 2.60, the field angle FOV of the optical lens 100 is 95.91 °, the total length TTL of the optical lens 100 is 4.55mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in table 7 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which will not be described herein again. It is understood that the units of the radius Y, the thickness, and the focal length in table 7 are mm, and the refractive index and the abbe number in table 7 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 7 indicates the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance between the image-side surface 12 of the first lens L1 and the object-side surface 63a of the focusing layer 63 on the optical axis O is 0.072mm in the state that the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.077 mm; in the object distance 1200mm state, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.080 mm; in the object distance infinity state, the distance from the image side 12 of the first lens L1 to the object side 63a of the focusing layer 63 on the optical axis O is 0.081 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.270mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance 400mm, the thickness of the protective film 62 on the optical axis O is 0.265 mm; under the state of object distance of 1200mm, the thickness of the protective film 62 on the optical axis O is 0.262 mm; in the state of the object distance at infinity, the thickness of the protective film 62 on the optical axis O is 0.261 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 135mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; in the object distance 1200mm state, the curvature radius of the object side surface 63a of the focusing layer 63 is 228 mm; in the object distance infinity state, the radius of curvature of the object-side surface 63a of the focusing layer 63 is-165 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 135mm in a state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; in the object distance 1200mm state, the curvature radius of the image side surface 63b of the focusing layer 63 is 228 mm; in the object distance infinity state, the radius of curvature of the image side 63b of the focusing layer 63 is-165 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 243.99mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-412.07 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-298.21 mm.

In the fourth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing embodiments, which is not described herein again. Table 8 below gives the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in example four.

TABLE 7

TABLE 8

Referring to fig. 20 to 23, as can be seen from the light spherical aberration graphs (a) in fig. 20 to 23, the light astigmatism graphs (B) in fig. 20 to 23, and the distortion graphs (C) in fig. 20 to 23, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled in the case of a near focus (i.e., an object distance of 150mm), a middle focus (i.e., an object distance of 400mm), a far focus (i.e., an object distance of 1200mm), and a focal length of infinity (i.e., an object distance of infinity), so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 20 to 23 (a), fig. 20 to 23 (B), and fig. 20 to 23 (C), the contents described in fig. 5 (a), fig. 5 (B), and fig. 5 (C) in the first embodiment can be referred to, and the details are not repeated herein.

EXAMPLE five

As shown in fig. 24, the optical lens 100 according to the fifth embodiment of the present invention includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length EFL of the optical lens 100 as 2.62mm/2.65mm/2.66mm/2.67mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in the near-focus state (i.e., the object distance is 150mm), the intermediate-focus state (i.e., the normal state, i.e., the object distance is 400mm), the far-focus state (i.e., the object distance is 1200mm), and the object distance infinity state, respectively. Specifically, in the near-focus state, EFL is 2.62 mm; in the medium-focus state, EFL is 2.65 mm; in the afocal state, EFL is 2.66 mm; in the infinite object distance state, EFL is 2.67 mm. The aperture value fno of the optical lens 100 is 2.50, the field angle FOV of the optical lens 100 is 101.72 °, the total length TTL of the optical lens 100 is 4.27mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in the following table 9, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which will not be described herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 9 are all mm, and the refractive index, the abbe number in table 9 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 9 indicates the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.065mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.070 mm; in the object distance 1200mm state, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.073 mm; in the state of infinite object distance, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.074 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.270mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance 400mm, the thickness of the protective film 62 on the optical axis O is 0.265 mm; under the state of object distance of 1200mm, the thickness of the protective film 62 on the optical axis O is 0.262 mm; in the state of the object distance at infinity, the thickness of the protective film 62 on the optical axis O is 0.261 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 132mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; under the condition that the object distance is 1200mm, the curvature radius of the object side surface 63a of the focusing layer 63 is-241 mm; in the object distance infinity state, the radius of curvature of the object-side surface 63a of the focusing layer 63 is-175 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 132mm in the state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; under the object distance of 1200mm, the curvature radius of the image side surface 63b of the focusing layer 63 is-241 mm; in the object distance infinity state, the radius of curvature of the image side 63b of the focusing layer 63 is-175 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 238.75mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-435.56 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-316.28 mm.

In the fifth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing description of the embodiments, which is not repeated herein. The high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 for each aspherical mirror surface in example five are shown in table 10 below.

TABLE 9

Watch 10

Referring to fig. 25 to 28, as can be seen from the light spherical aberration graphs (a) in fig. 25 to 28, the light astigmatism graphs (B) in fig. 25 to 28, and the distortion graphs (C) in fig. 25 to 28, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 in the cases of the near focus (i.e., the object distance is 150mm), the middle focus (i.e., the object distance is 400mm), the far focus (i.e., the object distance is 1200mm), and the focal length is infinity (i.e., the object distance is infinity), so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 25 to fig. 28 (a), fig. 25 to fig. 28 (B), and fig. 25 to fig. 28 (C), reference may be made to the contents described in fig. 5 (a), fig. 5 (B), and fig. 5 (C) in the first embodiment, and details thereof are not repeated here.

EXAMPLE six

As shown in fig. 29, an optical lens 100 according to a sixth embodiment of the present invention includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length EFL of the optical lens 100 as 2.78mm/2.81mm/2.83mm/2.83mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in the near-focus state (i.e., the object distance is 150mm), the intermediate-focus state (i.e., the normal state, i.e., the object distance is 400mm), the far-focus state (i.e., the object distance is 1200mm), and the object distance infinity state, respectively. Specifically, in the near-focus state, EFL is 2.78 mm; in the medium-focus state, EFL is 2.81 mm; in the afocal state, EFL is 2.83 mm; in the infinite object distance state, the EFL is 2.83 mm. The aperture value fno of the optical lens 100 is 2.30, the field angle FOV of the optical lens 100 is 98.40 °, the total length TTL of the optical lens 100 is 4.45mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in the following table 11, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which will not be described herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 11 are mm, and the refractive index and the abbe number in table 11 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 11 indicates the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.075mm in the state that the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.080 mm; in the object distance 1200mm state, the distance from the image side 12 of the first lens L1 to the object side 63a of the focusing layer 63 on the optical axis O is 0.083 mm; in the state of infinite object distance, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.076 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.270mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance 400mm, the thickness of the protective film 62 on the optical axis O is 0.265 mm; under the state of object distance of 1200mm, the thickness of the protective film 62 on the optical axis O is 0.262 mm; the thickness of the protective film 62 on the optical axis O in the object distance infinite state is 0.269 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 136mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; under the state of object distance of 1200mm, the curvature radius of the object side 63a of the focusing layer 63 is-225 mm; in the object distance infinity state, the radius of curvature of the object-side surface 63a of the focusing layer 63 is-160 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 136mm in a state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; under the object distance of 1200mm, the curvature radius of the image side surface 63b of the focusing layer 63 is-225 mm; in the object distance infinity state, the radius of curvature of the image side 63b of the focusing layer 63 is-160 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 245.79mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-406.64 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-289.17 mm.

In the sixth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing embodiments, which is not described herein again. Table 12 below gives the high-order term coefficients k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in example six.

TABLE 11

TABLE 12

Referring to fig. 30 to 33, as can be seen from the spherical aberration graphs of the light beams (a) in fig. 30 to 33, the astigmatism graphs of the light beams (B) in fig. 30 to 33, and the distortion graphs of the light beams (C) in fig. 30 to 33, the longitudinal spherical aberration, the astigmatism, and the distortion of the optical system 100 are well controlled in the case of the near focus (i.e., the object distance is 150mm), the intermediate focus (i.e., the object distance is 400mm), the far focus (i.e., the object distance is 1200mm), and the focal length is infinity (i.e., the object distance is infinity), so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 30 to 33 (a), fig. 30 to 33 (B), and fig. 30 to 33 (C), reference may be made to the contents described in fig. 5 (a), fig. 5 (B), and fig. 5 (C) in the first embodiment, and details thereof are not repeated here.

EXAMPLE seven

Fig. 34 shows a schematic structural diagram of an optical lens 100 disclosed in seventh embodiment of the present invention, where the optical lens 100 includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Specifically, taking the effective focal length EFL of the optical lens 100 as 2.86mm/2.90mm/2.92mm/2.93mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in a near-focus state (i.e., the object distance is 150mm), an intermediate-focus state (i.e., the object distance is 400mm), a far-focus state (i.e., the object distance is 1200mm), and an object distance infinity state (i.e., the object distance is infinity), respectively. Specifically, in the near-focus state, EFL is 2.86 mm; in the medium-focus state, EFL is 2.90 mm; in the afocal state, EFL is 2.92 mm; in the infinite object distance state, EFL is 2.93 mm. The aperture value fno of the optical lens 100 is 2.20, the field angle FOV of the optical lens 100 is 96.62 °, the total length TTL of the optical lens 100 is 4.59mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in the following table 13, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which will not be described herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 13 are mm, and the refractive index and the abbe number in table 13 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 13 indicates the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.075mm in the state that the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.080 mm; in the object distance 1200mm state, the distance from the image side 12 of the first lens L1 to the object side 63a of the focusing layer 63 on the optical axis O is 0.083 mm; in the object distance infinity state, the distance from the image side 12 of the first lens L1 to the object side 63a of the focusing layer 63 on the optical axis O is 0.084 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.270mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance 400mm, the thickness of the protective film 62 on the optical axis O is 0.265 mm; under the state of object distance of 1200mm, the thickness of the protective film 62 on the optical axis O is 0.262 mm; in the state of the object distance at infinity, the thickness of the protective film 62 on the optical axis O is 0.261 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 137mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; under the state of object distance of 1200mm, the curvature radius of the object side 63a of the focusing layer 63 is-220 mm; in the object distance infinity state, the radius of curvature of the object-side surface 63a of the focusing layer 63 is-160 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 137mm in the state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; under the object distance 1200mm state, the curvature radius of the image side surface 63b of the focusing layer 63 is-220 mm; in the object distance infinity state, the radius of curvature of the image side 63b of the focusing layer 63 is-160 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 247.60mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-397.61 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-289.17 mm.

In the seventh embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing embodiments, which is not described herein again. Table 14 below gives the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in example seven.

Watch 13

TABLE 14

Referring to fig. 35 to 38, as can be seen from the light spherical aberration graphs (a) in fig. 35 to 38, the light astigmatism graphs (B) in fig. 35 to 38, and the distortion graphs (C) in fig. 35 to 38, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 in the cases of the near focus (i.e., the object distance is 150mm), the middle focus (i.e., the object distance is 400mm), the far focus (i.e., the object distance is 1200mm), and the focal length is infinity (i.e., the object distance is infinity), so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 35 to 38 (a), fig. 35 to 38 (B), and fig. 35 to 38 (C), the contents described in fig. 5 (a), fig. 5 (B), and fig. 5 (C) in the first embodiment can be referred to, and the details are not repeated herein.

Example eight

As shown in fig. 39, the optical lens 100 according to the eighth embodiment of the present invention includes a first lens L1, a focusing structure 60, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 70, which are sequentially disposed from an object side to an image side along an optical axis O.

Further, the first lens L1 has a positive power, the second lens L2 has a negative power, the third lens L3 has a positive power, the fourth lens L4 has a positive power, and the fifth lens L5 has a negative power.

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

Specifically, taking the effective focal length EFL of the optical lens 100 as 3.19mm/3.24mm/3.26mm/3.27mm as an example, that is, the EFL is the effective focal length of the optical lens 100 in the near-focus state (i.e., the object distance is 150mm), the intermediate-focus state (i.e., the normal state, i.e., the object distance is 400mm), the far-focus state (i.e., the object distance is 1200mm), and the object distance infinity state, respectively. Specifically, in the near-focus state, EFL is 3.19 mm; in the medium-focus state, EFL is 3.24 mm; in the afocal state, EFL is 3.26 mm; in the infinite object distance state, EFL is 3.27 mm. The aperture value fno of the optical lens 100 is 2.50, the field angle FOV of the optical lens 100 is 90.20 °, the total length TTL of the optical lens 100 is 5.24mm, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 3.24mm, and other parameters of the optical lens 100 in the near focus state (i.e., the object distance is 150mm), the intermediate focus state (i.e., the object distance is 400mm), the far focus state (i.e., the object distance is 1200mm), and the object distance infinity state are given in the following table 15, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 15 are mm, and the refractive index and the abbe number in table 15 are obtained at the reference wavelength of 587.6nm, and the focal length is obtained at the reference wavelength of 555 nm.

It should be noted that the thickness of the object plane in table 15 indicates the distance between the object and the optical lens 100, i.e., the aforementioned object distance. The thickness of the surface number 2 indicates that the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.125mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 1.130 mm; in the object distance 1200mm state, the distance from the image side surface 12 of the first lens L1 to the object side surface 63a of the focusing layer 63 on the optical axis O is 0.132 mm; in the object distance infinity state, the distance from the image side 12 of the first lens L1 to the object side 63a of the focusing layer 63 on the optical axis O is 0.133 mm. The thickness of the protective film 62 indicates that the thickness of the protective film 62 on the optical axis O is 0.276mm in the state that the optical lens 100 is at the object distance of 150 mm; under the state of object distance of 400mm, the thickness of the protective film 62 on the optical axis O is 0.270 mm; under the state of object distance of 1200mm, the thickness of the protective film 62 on the optical axis O is 0.268 mm; in the object distance infinity state, the thickness of the protective film 62 on the optical axis O is 0.267 mm. The Y radius of the focusing layer 63 indicates that the curvature radius of the object-side surface 63a of the focusing layer 63 is 112mm in the state where the optical lens 100 is at the object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the object side surface 63a of the focusing layer 63 is infinite; under the state of object distance of 1200mm, the curvature radius of the object side 63a of the focusing layer 63 is-320 mm; in the object distance infinity state, the radius of curvature of the object-side surface 63a of the focusing layer 63 is-210 mm. The Y radius of the protective film 62 indicates that the curvature radius of the image side surface 63b of the focus layer 63 is 112mm in a state where the optical lens 100 is at an object distance of 150 mm; in the state of an object distance of 400mm, the curvature radius of the image side surface 63b of the focusing layer 63 is infinite; in the object distance 1200mm state, the curvature radius of the image side surface 63b of the focusing layer 63 is-320 mm; in the object distance infinity state, the radius of curvature of the image side 63b of the focusing layer 63 is-210 mm. The focal lengths of the focusing layer 63 and the protective film 62 indicate that the combined focal length of the focusing layer 63 and the protective film 62 is 202.42mm in a state where the object distance is 150 mm; in a state of an object distance of 400mm, a combined focal length of the focusing layer 63 and the protective film 62 is 0.00 mm; under the state of object distance 1200mm, the combined focal length of the focusing layer 63 and the protective film 62 is-578.34 mm; in the object distance infinity state, the combined focal length of the focusing layer 63 and the protective film 62 is-379.53 mm.

In the eighth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 through the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing embodiments, which is not described herein again. Table 16 below gives the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in example eight.

Watch 15

TABLE 16

Referring to fig. 40 to 43, as can be seen from the light spherical aberration graphs (a) in fig. 40 to 43, the light astigmatism graphs (B) in fig. 40 to 43, and the distortion graphs (C) in fig. 40 to 43, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 in the cases of the near focus (i.e., the object distance is 150mm), the middle focus (i.e., the object distance is 400mm), the far focus (i.e., the object distance is 1200mm), and the focal length is infinity (i.e., the object distance is infinity), are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 40 to fig. 43 (a), fig. 40 to fig. 43 (B), and fig. 40 to fig. 43 (C), reference may be made to the contents described in fig. 5 (a), fig. 5 (B), and fig. 5 (C) in the first embodiment, and details thereof are not repeated here.

Referring to table 17, table 17 summarizes ratios of the relations in the first to eighth embodiments of the present invention.

TABLE 17

In a second aspect, referring to fig. 44, the present invention further discloses a camera module 200, where the camera module 200 includes an image sensor 201 and the optical lens 100 according to any one of the first to eighth embodiments, the image sensor 201 is disposed at an image side of the optical lens 100, and the image sensor 201 is configured to convert an optical signal corresponding to a subject into an image signal, which is not described herein again. It can be understood that the camera module 200 having the optical lens 100 can meet the design requirements of wide view, small distortion and fast focusing of the camera module 200, and improve the imaging quality of the camera module 200.

In a third aspect, referring to fig. 45, the present invention further discloses an electronic apparatus 300, where the electronic apparatus 300 includes a housing and the camera module 200 as described above, and the camera module 200 is disposed in the housing. It can be understood that the electronic device 300 having the camera module 200 can meet the design requirements of wide view, small distortion and fast focusing of the electronic device 300, and improve the imaging quality of the electronic device 300.

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

Claims

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

the optical lens satisfies the following relation: 1< T1/T2< 3;

when the T1 is converted from the normal state to the near focus state, the image-side surface of the first lens reaches the object-side surface of the focusing layer of the focusing structure at the distance variation on the optical axis, and when the T2 is converted from the normal state to the far focus state, the image-side surface of the first lens reaches the object-side surface of the focusing layer of the focusing structure at the distance variation on the optical axis.

2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.1< air 1/TTL < 0.2;

wherein airL1 is a distance on the optical axis from an image-side surface of the first lens element to an object-side surface of the second lens element, and TTL is a distance on the optical axis from an object-side surface of the first lens element to an image plane of the optical lens system.

3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.2< TTL/EFL < 1.65;

wherein, 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, and EFL is an effective focal length of the optical lens.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1< EFL/f1< 1.5;

wherein EFL is an effective focal length of the optical lens, and f1 is an effective focal length of the first lens.

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.2< | f1/f2| < 0.6;

wherein f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.25< ETL3/CTL3< 0.5;

the ETL3 is a distance from a maximum effective half aperture of an object-side surface of the third lens element to a maximum effective half aperture of an image-side surface of the third lens element along the optical axis, and the CTL3 is a thickness of the third lens element along the optical axis.

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.2< DL5/DL4< 1.4;

DL5 is the maximum effective aperture of the image side surface of the fifth lens; DL4 is the maximum effective aperture of the image side surface of the fourth lens.

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.5< rad (fov)/fno < 1;

wherein rad (fov) is an arc value of a maximum field angle of the optical lens, and fno is an f-number of the optical lens.

9. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: -0.6mm < (R7R 8)/(R7+ R8) < -0.1 mm;

wherein R7 is a radius of curvature of an object-side surface of the fourth lens element at the optical axis, and R8 is a radius of curvature of an image-side surface of the fourth lens element at the optical axis.

10. A camera module, comprising an optical lens according to any one of claims 1 to 9 and an image sensor, wherein the image sensor 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.