CN113933964B

CN113933964B - Optical lens, camera module and electronic equipment

Info

Publication number: CN113933964B
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: 2023-09-05
Anticipated expiration: 2041-10-13
Also published as: CN113933964A

Abstract

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

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

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

Disclosure of Invention

The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, which can realize 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, the present invention discloses, in a first aspect, an optical lens including a first lens, an adjustable lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are disposed in order from an object side to an image side along an optical axis, in total of six lenses having refractive power;

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 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;

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

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

the fifth lens element has optical power, wherein an object-side surface of the fifth lens element is convex at a paraxial region thereof, and an image-side surface of the fifth lens element is concave at a paraxial region thereof;

The adjustable lens is arranged between the first lens and the second lens, the adjustable lens comprises a focusing layer arranged on the object side, and the adjustable lens deforms the surface of the object side of the adjustable lens through the focusing layer;

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

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

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes an image sensor and the optical lens according to the first aspect, and the image sensor is disposed on an image side of the optical lens. The camera module with the optical lens of the first aspect can realize the design requirements of wide view, small distortion and quick focusing of the camera module and improve the imaging quality of the camera module.

In a third aspect, the present application discloses an electronic device, which includes a housing and an image capturing module set according to the second aspect, where the image capturing module set is disposed in the housing. The electronic equipment with the camera module can realize the design requirements of wide view, small distortion and quick focusing of the electronic equipment and improve the imaging quality of the electronic equipment.

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

according to the optical lens, the camera module and the electronic equipment provided by the embodiment of the application, the first lens with positive focal power is adopted, and the object side surface and the image side surface of the first lens are both convex surfaces at the paraxial region, so that the optical lens is beneficial to collecting light rays injected into the optical lens. 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 the light rays which are gathered by the first lens and enter the optical lens are diffused, and the requirement of the image height of the optical lens is met. Through the mutual matching of the first lens and the second lens, the volume of the optical lens can be effectively compressed, and the aberration and the field curvature of the optical lens can be corrected while the miniaturized design of the optical lens is realized. 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 field curvature and smoothing distortion of an external field are realized, and the distortion generated by the optical lens is reduced. The object side surface of the fourth lens is a concave surface at the paraxial region, which is favorable for expanding the field of view range of the optical lens and realizing the design requirement of wide view of the optical lens. The object side surface of the fifth lens is a convex surface at the paraxial region, and the image side surface of the fifth lens is a concave surface at the paraxial region, so that the aberration generated by the first lens to the fourth lens can be corrected, the aberration balance of the optical lens is promoted, the resolution of the optical lens is further improved, and the imaging quality of the optical lens is further improved. The optical lens is provided with the focusing structure between the first lens and the second lens, so that the focusing structure can quickly adjust the focal length according to different shooting states, further the focal power variation of the focusing structure is controlled, the automatic focusing function of the optical lens is realized, the quick focusing effect of the optical lens is realized under the condition of meeting the requirement of miniaturization design, and the imaging quality of the optical lens is improved. Furthermore, the optical lens satisfies the relation: 1< T1/T2<3, when the above relation is satisfied, the fine change of the focusing layer can cause the fine focal power change of the optical lens, so that when the object to be shot changes in the range of near focus and 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 further improved. That is, the optical lens provided by the application can realize 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 of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an optical lens according to an embodiment of the present invention;

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

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

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

fig. 5 is a graph of spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a near-focus state according to an embodiment of the present invention;

fig. 6 is a graph of spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a mid-focal state according to an embodiment of the present invention;

Fig. 7 is a graph of spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a far focus state according to an embodiment of the present invention;

fig. 8 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in 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 a second embodiment of the present invention;

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

fig. 11 is a graph of spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a mid-focal state according to the second embodiment of the present invention;

fig. 12 is a graph of spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a far focus state according to the second embodiment of the present invention;

fig. 13 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in an infinite focal length state according to a second embodiment of the present invention;

FIG. 14 is a schematic view of an optical lens according to a third embodiment of the present invention;

fig. 15 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens in a near-focus state according to the third embodiment of the present invention;

Fig. 16 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a mid-focal state according to the third embodiment of the present invention;

fig. 17 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens in a far focus state according to the third embodiment of the present invention;

fig. 18 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in an infinite focal length state according to a third embodiment of the present invention;

FIG. 19 is a schematic view of an optical lens according to a fourth embodiment of the present invention;

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

fig. 21 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a mid-focal state according to the fourth embodiment of the present invention;

fig. 22 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens in a far focus state according to the fourth embodiment of the present invention;

fig. 23 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in an infinite focal length state according to an embodiment of the present invention;

FIG. 24 is a schematic diagram of an optical lens according to a fifth embodiment of the present invention;

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

fig. 26 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a mid-focal state according to the fifth embodiment of the present invention;

fig. 27 is a graph of spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a far focus state according to a fifth embodiment of the present invention;

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

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

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

fig. 31 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens in a mid-focal state according to a sixth embodiment of the present invention;

fig. 32 is a graph of spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a far-focus state according to the sixth embodiment of the present invention;

Fig. 33 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in an infinite focal length state according to a sixth embodiment of the present invention;

FIG. 34 is a schematic view of an optical lens according to a seventh embodiment of the present invention;

fig. 35 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a near-focus state according to embodiment seven of the present invention;

fig. 36 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a mid-focal state according to embodiment seven of the present invention;

fig. 37 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a far focus state according to the seventh embodiment of the present invention;

fig. 38 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens in a focal length infinity state according to embodiment seven of the present invention;

FIG. 39 is a schematic diagram of an optical lens according to an eighth embodiment of the present invention;

fig. 40 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a near-focus state according to an eighth embodiment of the present invention;

fig. 41 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a mid-focal state according to an eighth embodiment of the present invention;

Fig. 42 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in a far focus state according to an eighth embodiment of the present invention;

fig. 43 is a graph of light spherical aberration (mm), astigmatic curve (mm), and distortion (%) of an optical lens in an infinite focal length state according to an eighth embodiment of the present invention;

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

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

Detailed Description

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

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

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

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

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

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

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

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both 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 a 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 a circumferential region; the object-side surface 31 of the third lens element L3 is concave at a paraxial region O, the image-side surface 32 of the third lens element L3 is convex at a paraxial region O, the object-side surface 31 of the third lens element L3 is convex at a circumferential region, and the image-side surface 32 of the third lens element L3 is concave at a circumferential region; 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 peripheral region; the object-side surface 51 of the fifth lens element L5 is convex at a 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 circumference.

Optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be plastic lenses, so that the optical lens 100 may be light and thin and easy to process the complex surface shape of the lens. Alternatively, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be glass lenses, so that the optical lens 100 has a good optical effect and the temperature sensitivity of the optical lens 100 may 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 practical situations, and the embodiment is not limited in particular.

Alternatively, the first, second, third, fourth, and fifth lenses L1, L2, L3, L4, and L5 may be spherical or aspherical lenses. It is understood that one aspherical lens can achieve the effect of correcting phase differences of a plurality of spherical lenses. That is, the use of the aspherical lens can correct the phase difference and reduce the number of lenses used, which is advantageous in meeting the miniaturization requirement 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, 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, which is not limited in this embodiment.

As shown in fig. 2, the focusing structure 60 is disposed between the first lens L1 and the second lens L2. Because the focusing structure 60 can rapidly adjust the focal length according to different shooting states, further control the focal power variation of the focusing structure 60, realize the automatic focusing function of the optical lens 100, and facilitate the rapid focusing effect of the optical lens 100 under the requirement of meeting the miniaturization design, thereby improving the imaging quality of the optical lens 100.

In some embodiments, the focusing structure 60 is an adjustable lens T-lens module, and the focusing structure 60 is used 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 supplying a control voltage and a T-lens core unit, which is driven by the control voltage supplied from the driving chip. More specifically, the T-lens core component includes a substrate 61, a protective film 62, a focusing layer 63, and a piezoelectric actuator 64 disposed in this order from the object side to the image side along an 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 energizing the focusing layer 63.

Alternatively, the focusing layer 63 may be a piezoelectric layer or a flexible layer encasing an optical liquid, i.e., 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 material of the piezoelectric layer is elongated by the action of an electric field force in the electric field direction, and when a large number of atomic cells are elongated microscopically and accumulated to a certain amount, macroscopic deformation of the material of the piezoelectric layer is exhibited. Since the deformation of the piezoelectric layer material is caused by the deformation of the atomic unit cell, the piezoelectric material has larger thrust than that of a driving device such as a focusing motor, and has higher response speed and higher action precision, thereby being beneficial to realizing the effect of quick focusing of the optical lens 100. When the focusing layer 63 is a flexible layer internally wrapped with the optical liquid, since the extrusion rings are arranged on two sides of the flexible layer, the driving chip drives the extrusion rings to extrude the surface of the flexible layer, so that the curvature radius of the surface of the flexible layer is changed, and the effect of quick focusing of the optical lens 100 is further realized.

That is, the focusing structure 60 can adjust the focal length of the focusing structure 60 according to different voltages, so as to control the variation of the focal power of the focusing structure 60, thereby achieving the auto-focusing function, being 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 achieve focusing, a motor is not required in the focusing process, and magnetic interference is not generated.

Referring to fig. 2 to 4, fig. 2 to 4 show deformation of the focusing structure 60 under the 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 deformation amount of the focusing structure 60, and the larger the optical power of the focusing structure 60, the smaller the focal length. Therefore, by adjusting the voltage applied to the focusing structure 60, the design requirements for rapid focusing of the optical lens can be achieved.

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

In some embodiments, the optical lens 100 further includes a filter 70, and the filter 70 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100. Optionally, the optical filter 70 may be an infrared optical filter, so that infrared light can be filtered out, and the imaging quality is improved, so that the imaging is more in line with the visual experience of human eyes. It is to be understood that the optical filter 70 may be made of an optical glass coating or may be made of a colored glass, and may be specifically selected according to practical needs, and the embodiment is not limited specifically.

In some embodiments, focusing structure 60 includes focusing layer 63 and optical lens 100 satisfies the following relationship: 1< T1/T2<3; wherein T1 is the distance variation 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 on the optical axis O when the normal state is changed to the near focus state, and T2 is the distance variation 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 on the optical axis O when the normal state is changed to 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. Because the focusing structure 60 can adjust the focal length of the focusing structure 60 according to different voltages, the variation of the focal power of the focusing structure 60 is further controlled. When the above relation 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 object to be shot changes in the range of near focus and far focus, the optical lens 100 can quickly change the focal length to realize optical focusing, so that 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< ai rL1/TTL <0.2; here, air L1 is the distance between the image side 12 of the first lens element L1 and the object side 21 of the second lens element L2 on the optical axis O, and TTL is the distance between the object side 11 of the first lens element L1 and the imaging plane 101 of the optical lens 100 on the optical axis (i.e. the total length of the optical lens). Considering 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 12 of the first lens L1 to the object side 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 under the condition of ensuring the performance parameters of the optical lens 100, so as to facilitate the setting of the focusing structure 60. When the above relation is satisfied, a space is sufficiently large between the first lens L1 and the second lens L2, so that the focusing structure 60 can be ensured to be mounted in the optical lens 100. When air L1/TTL is less than or equal to 0.1, there is insufficient space between the first lens L1 and the second lens L2 to mount the focusing structure 60. When air L1/TTL is not less than 0.2, although the focusing structure 60 can be installed, the air gap between the second lens L2 and the fifth lens L5 is excessively compressed, so that the total air gap of the lenses is too small relative to the total length, which may result in a decrease in the overall resolution of the optical lens 100, resulting in blurring of imaging of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2< TTL/EFL <1.65; wherein 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 achieved. When TTL/EFL is less than or equal to 1.2, the total length of the optical lens 100 is too short, the sensitivity of the optical lens 100 is high, light is not beneficial to converging on the imaging surface 101 of the optical lens 100, and meanwhile, the effective focal length of the optical lens 100 is increased relative to the total length of the optical lens 100, so that the depth of field is shallow, and the imaging quality of the optical lens 100 is affected. When TTL/EFL is greater than or equal to 1.65, the total length of the optical lens 100 is too long, so that the overall volume of the optical lens 100 is increased, which is not beneficial to the miniaturization design requirement, and meanwhile, the angle of view of light entering the optical lens 100 is reduced, which is not beneficial to the design requirement of the 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 L5 to the imaging surface 101 in the direction of the optical axis O. When the above relation is satisfied, the optical lens 100 can satisfy miniaturization and ensure a sufficient focusing range of the optical lens 100, so as to improve the assembly yield of the optical lens 100, and in addition, the design requirement of large focal depth of the optical lens 100 can be realized, and more depth information on the object side can be obtained. When the FBL/EFL is less than or equal to 0.2, the assembly yield of the optical lens 100 is too low to increase the difficulty of the production process, and the focal depth of the optical lens 100 cannot be ensured, so that the imaging quality of the optical lens 100 is poor; when 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 a 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-surface lens, the optical lens 100 has a larger field angle and image surface than a standard lens, and the wide-angle lens has a smaller focal length than a common lens, so that the optical lens 100 with a larger depth of field can achieve the design purpose of wide view and can achieve high-definition shooting experience of near-far objects while having an ultra-large image surface. 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 to achieve the design requirements of wide view and high imaging quality of the optical lens 100. When 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 a lens angle exceeding the maximum range of the lens angle, resulting in failure to manufacture and process the lens; when 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 leads to a large structure and a shallow depth of field of the optical lens 100, and fails to meet the design requirement of miniaturization of the optical lens 100, and leads to poor quality of long-range shooting imaging.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< EFL/f1<1.5; wherein f1 is the effective focal length of the first lens L1. Since the first lens L1 has positive optical power, light entering the optical lens 100 is well converged. Further, the focal length of the first lens L1 determines the angle of view size of the optical lens 100. When the angle of view of the optical lens 100 is greater than 86 °, if the ratio of the effective focal length of the optical lens 100 to the focal length of the first lens L1 is not suitable, the optical lens 100 is excessively distorted, the imaging quality is reduced, and the sensitivity of the optical lens 100 is increased, which makes the processing process difficult. Therefore, when the above relation is satisfied, the effective focal length of the optical lens 100 and the focal length of the first lens L1 are appropriately adapted, so that the distortion generated by the optical lens 100 can be effectively corrected, and further, the imaging quality and the workability of the optical lens 100 are ensured. If EFL/f1 is less than or equal to 1, the wide-viewing design requirement of the optical lens 100 is not favorably realized. When EFL/f1 is not less than 1.5, the imaging of the optical lens 100 is curved, and the imaging 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 positive focal power, which is beneficial to the collection of light rays. The second lens L2 has negative focal power, so that the light transmitted through the first lens L1 can be diffused, thereby meeting the requirement of the image height of the optical lens 100. The combination of the first lens L1 and the second lens L2 not only can effectively compress the volume of the optical lens 100 and meet the design requirement of miniaturization, but also can well correct the aberration and curvature of field of the whole optical lens 100. Therefore, the aforementioned effects can be preferably achieved 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. Meanwhile, when the above-described relational expression is satisfied, the total length of the optical lens 100 can be reduced, and the design requirement for miniaturization can be realized.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.25< ETL3/CTL3<0.5; the ETL3 is a distance from the maximum effective half-caliber of the object side surface 31 of the third lens element L3 to the maximum effective half-caliber of the image side surface 32 of the third lens element L3 along the optical axis O, and the CTL3 is a thickness of the third lens element L3 on the optical axis O. The third lens L3 adopts a shape design with thin edges and thick centers, is favorable for correcting distortion and field curvature generated by the optical lens 100 and balancing the optical path difference of the optical lens 100, and achieves the purposes of correcting the field curvature of the optical lens 100 and smoothing the distortion of an external field of view. If the edge thickness of the third lens L3 is too thin, the requirements of the production process cannot be satisfied and the molding yield is ensured. And if the center thickness of the third lens L3 is too thin or too thick, it may cause that the center light and the edge light are difficult to converge near the imaging surface 101 of the optical lens 100, resulting in an excessive field curvature of the optical lens 100. Therefore, to achieve the above objective, the ratio of the distance from the maximum effective half-aperture of the object-side surface 31 of the third lens element L1 to the maximum effective half-aperture of the image-side surface 32 of the third lens element L3 along the optical axis O to the thickness of the third lens element L3 along the optical axis O needs to be controlled within a certain range, i.e. the ratio of the edge thickness to the center thickness of the third lens element L3 needs to be controlled within a certain range. When the above relation is satisfied, the third lens L3 can correct the 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 and smoothing distortion of the external field of view of the optical lens 100. When 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 and processing molding yield of the third lens L3 is reduced. When ETL3/CTL3 is more than or equal to 0.5, the center thickness of the third lens L3 is too thin relative to the edge thickness, so that the field curvature of the imaging surface 101 of the optical lens 100 is easily large, the distortion of the optical lens 100 is large, the image of the edge view field is distorted, and the imaging quality is poor.

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 L4. Since 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 cooperate with each other, so that light can be well excessive when passing through the fourth lens L4 and the fifth lens L5, and the problem that the total reflection phenomenon occurs due to the fact that light with an excessive angle is incident on the lens surface or the imaging quality of the optical lens 100 is affected due to the fact that 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 be incident on the imaging surface of the optical lens 100 at a proper angle, so as to improve the imaging quality of the optical lens 100. When DL5/DL4 is less than or equal to 1.2, the effective diameter of the fifth lens L5 is smaller than that of the fourth lens L4, and the outgoing angle of the light passing through the fourth lens L4 and the fifth lens L5 is smaller, so that the angle when the light reaches the imaging surface 101 of the optical lens 100 is smaller, and the matching degree between the light and the chip 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 L5 is too large compared with the effective diameter of the fourth lens L4, so that the angle of the light rays from the fourth lens L4 to the fifth lens L5 is too large, and the edge line cannot reach the imaging surface 101 of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 86 ° < FOV <102 °; wherein FOV is the field angle of the optical lens 100. When the above relation is satisfied, the design requirement of the optical lens 100 for wide viewing can be satisfied, so that the optical lens 100 can capture a larger area of scenery.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5< rad (FOV)/fno <1; where RAD (FOV) is the radian value of the maximum field angle of the optical lens 100, and fno is the 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, an excessive f-number of the optical lens 100 may cause the effective aperture of the first lens L1 to be reduced, and the light flux of the optical lens 100 is insufficient, so that 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 equal to or greater than 1, the maximum field angle of the optical lens 100 is too large, and is not matched with the effective diameter of the first lens L1, so that the situation of blocking light by edge light may occur.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.4mm ^-1 <fno/Imgh<0.9mm ^-1 The method comprises the steps of carrying out a first treatment on the surface of the 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 magnitude of the light flux of the entire optical lens 100, the radius of the maximum effective imaging circle of the optical lens 100 determines the picture sharpness and the pixel size of the optical lens 100. Therefore, the relationship between the two is reasonably limited to ensure that the optical lens 100 has enough light flux and ensure the definition of imaging. When the above-described relational expression is satisfied, the optical lens 100 has a sufficient light flux and high imaging definition. When fno/Imgh is less than or equal to 0.4, the f-number of the optical lens 100 is too small, so that overexposure is caused, and the brightness is too high, so that the imaging quality of the optical lens 100 is affected; when fno/Imgh is greater than or equal to 0.9, the f-number of the optical lens 100 is too large, resulting in insufficient light flux, and when the brightness is insufficient, the image sensitivity of the optical lens 100 is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: -0.6mm < (r7×r8)/(r7+r8) < -0.1mm; wherein R7 is a radius of curvature of the object-side surface 41 of the fourth lens element L4 at the optical axis O, and R8 is a radius of curvature of the image-side surface 42 of the fourth lens element L4 at the optical axis O. When the above relation is satisfied, the radius of curvature of the object-side surface 41 of the fourth lens element L4 at the optical axis O and the radius of curvature 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 light ray of the optical lens assembly 100 and the light ray at the paraxial region O, reasonably correct the curvature of field and astigmatism, reduce the sensitivity of the optical lens assembly 100, and improve the assembly stability of the optical lens assembly 100.

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

Example 1

As shown in fig. 1, a schematic structural diagram of an optical lens 100 according to an embodiment of the present invention is shown, and 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 sequentially disposed from an object side to an image side along an optical axis O.

Further, the first lens L1 has positive power, the second lens L2 has negative power, the third lens L3 has positive power, the fourth lens L4 has negative power, and the fifth lens L5 has 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 peripheral region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 convex at the peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and convex at the peripheral region.

Specifically, taking the effective focal length efl= 2.617mm/2.650mm/2.659mm/2.665mm of the optical lens 100 as an example, that is, EFL is an effective focal length at which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity, respectively. Specifically, in the near-focus state, efl= 2.617mm; in mid state, efl=2.650 mm; in the far focus state, efl=2.659 mm; in the object distance infinity state, efl= 2.665mm. Other parameters of the aperture value fno=2.50 of the optical lens 100, the field angle fov= 101.73 ° of the optical lens 100, the total length ttl=4.26 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm), and the object distance infinity state are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 1 and 2 correspond to the object side surface 11 and the image side surface 12 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or the image side of the corresponding plane number at the optical axis O, where the radius Y of the focusing layer 63 is the radius of curvature of the object side 63a of the focusing layer 63, and the radius Y of the protective film 62 is the radius of curvature of the image side 63b of the focusing layer 63. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The value of the aperture 102 in the "thickness" parameter row is the distance between the aperture 102 and the object side surface 11 of the first lens L1 on the optical axis O. The focusing layer 63 and the protective film 62 in table 1 are made of high molecular polymers, and the high molecular polymers may be plastics, such as polyethylene plastics, polyethylene terephthalate plastics, or polycarbonate plastics; the substrate 61 may be made of glass or plastic, such as polycarbonate plastic (Polycarbonate Plastic, PC) and the like. It is understood that the units of the radius, thickness and focal length of Y in table 1 are all mm, and the refractive index and 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.

The thickness of the object plane in table 1 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 2 indicates that 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 0.065mm when 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 0.070mm; in the state of 1200mm of 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 0.072mm; in the object distance infinity 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 0.073mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.265mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.263mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.262mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 120mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is-295 mm; in the object distance infinite state, the radius of curvature of the object side surface 63a of the focusing layer 63 is 200mm. The Y radius of the protective film 62 indicates that the radius of curvature of the image side surface 63b of the focusing layer 63 is 120mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is-295 mm in the state of an object distance of 1200 mm; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is 200mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 216.88mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-533.16 mm; in the object distance infinite 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, and the surface profile x of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis O direction; c is the curvature of the aspherical surface at the optical axis O, 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 the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example one are given in Table 2 below.

TABLE 1

TABLE 2

Referring to fig. 5, fig. 5 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical lens 100 of the first embodiment in a near-focus state (i.e., object distance=150 mm), specifically, referring to fig. 5 (a), fig. 5 (a) shows an optical spherical aberration curve of the optical lens 100 of the first embodiment at wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 430nm, and in fig. 5 (a), an abscissa along the X-axis represents a focus shift, and an ordinate along the Y-axis 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 indicates 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 light astigmatism diagram of the optical lens 100 at a wavelength of 555nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatic curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S, and it can be seen from fig. 5 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated. Referring to fig. 5 (C), fig. 5 (C) is a graph showing distortion of the optical lens 100 at a wavelength of 555nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 5 (C), 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 (a) optical spherical aberration graphs in fig. 6 to 8, the (B) optical spherical aberration graphs in fig. 6 to 8, and the (C) distortion graphs in fig. 6 to 8, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the middle focal (i.e., object distance=400 mm), far focal (i.e., object distance=1200 mm), and focal length infinity (i.e., object distance infinity), so that the optical system 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 to 8 (a), 6 to 8 (B), and 6 to 8 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B), and 5 (C), and the descriptions are omitted here.

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 sequentially disposed from an object side to an image side along an optical axis O.

Further, the first lens L1 has positive power, the second lens L2 has negative power, the third lens L3 has positive power, the fourth lens L4 has negative power, and the fifth lens L5 has 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 peripheral region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and convex at the peripheral region.

Specifically, taking the effective focal length efl=2.79 mm/2.82mm/2.84mm/2.84mm of the optical lens 100 as an example, that is, the EFL is the effective focal length in which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity state, respectively. Specifically, in the near-focus state, efl=2.79 mm; in mid state, efl=2.82 mm; in the far focus state, efl=2.84 mm; in the object distance infinity state, efl=2.84 mm. The aperture value fno=2.30 of the optical lens 100, the field angle fov= 98.16 ° of the optical lens 100, the total length ttl=4.45 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, and other parameters of the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm) and the object distance infinity state are given in the following table 3, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 3 are all 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.

The thickness of the object plane in table 3 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 2 indicates that 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 0.078mm when the object distance of the optical lens 100 is 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 0.083mm; in the state of 1200mm of 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 0.086mm; in the object distance infinity 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 0.087mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.265mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.262mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.261mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 130mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is-240 mm; in the object distance infinite 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 radius of curvature of the image side surface 63b of the focusing layer 63 is 130mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is-240 mm in the state of 1200mm of object distance; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is-165 mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 243.95mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-433.75 mm; in the object distance infinite 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 to the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiment, which is not repeated here. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example two are given in Table 4 below.

TABLE 3 Table 3

TABLE 4 Table 4

Referring to fig. 10 to 13, as can be seen from the (a) optical spherical aberration graphs in fig. 10 to 13, the (B) optical astigmatic graphs in fig. 10 to 13, and the (C) distortion graphs in fig. 10 to 13, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the near-focus (i.e., object distance=150 mm), mid-focus (i.e., object distance=400 mm), far-focus (i.e., object distance=1200 mm), and infinite focal length (i.e., object distance 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), 10 to 13 (B), and 10 to 13 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B), and 5 (C) in the first embodiment, and the descriptions are omitted here.

Example III

As shown in fig. 14, a schematic structural diagram of an optical lens 100 according to a third embodiment of the present invention is shown, and 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 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 peripheral region; 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 peripheral region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the peripheral region O, respectively.

Specifically, taking the effective focal length efl=2.77 mm/2.80mm/2.81mm/2.82mm of the optical lens 100 as an example, that is, the EFL is the effective focal length in which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity state, respectively. Specifically, in the near-focus state, efl=2.77 mm; in mid state, efl=2.80 mm; in the far focus state, efl=2.81 mm; in the object distance infinity state, efl=2.82 mm. The aperture value fno=2.09 of the optical lens 100, the field angle fov=98.56° of the optical lens 100, the total length ttl=4.47 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, and other parameters of the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm) and the object distance infinity state are given in the following table 5, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 5 are all mm, and the refractive index and 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.

The thickness of the object plane in table 5 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 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 when the object distance of the optical lens 100 is 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 0.086mm; in the state of 1200mm of 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 0.089mm; in the object distance infinity state, 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 0.090mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.265mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.262mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.261mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 138mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is-220 mm; in the object distance infinite 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 radius of curvature of the image side surface 63b of the focusing layer 63 is 138mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is-220 mm in the state of 1200mm of object distance; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is-160 mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 249.41mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-397.61 mm; in the object distance infinite 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 to the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated here. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example three are given in Table 6 below.

TABLE 5

TABLE 6

Referring to fig. 15 to 18, as can be seen from the (a) optical spherical aberration graphs in fig. 15 to 18, the (B) optical astigmatic graphs in fig. 15 to 18, and the (C) distortion graphs in fig. 15 to 18, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the near-focus (i.e., object distance=150 mm), mid-focus (i.e., object distance=400 mm), far-focus (i.e., object distance=1200 mm), and infinite focal length (i.e., object distance 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), 15 to 18 (B) and 15 to 18 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B) and 5 (C) in the first embodiment, and the description thereof will not be repeated here.

Example IV

As shown in fig. 19, a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present invention is shown, and 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 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 peripheral region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 convex at the peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the peripheral region O, respectively.

Specifically, taking the effective focal length efl=2.90 mm/2.93mm/2.96mm/2.96mm of the optical lens 100 as an example, that is, the EFL is the effective focal length in which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity state, respectively. Specifically, in the near-focus state, efl=2.90 mm; in mid state, efl=2.93 mm; efl=2.96 mm in the far focus state; in the object distance infinity state, efl=2.96 mm. The aperture value fno=2.60 of the optical lens 100, the field angle fov=95.91° of the optical lens 100, the total length ttl=4.55 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, and other parameters of the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm) and the object distance infinity state are given in the following table 7, and the definition of each parameter can be obtained from the description of the foregoing embodiments, and will not be repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 7 are all mm, and the refractive index and 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.

The thickness of the object plane in table 7 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 2 indicates that 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 0.072mm when the optical lens 100 is in the object distance 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 0.077mm; in the state of 1200mm of 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 0.080mm; in the object distance infinity state, 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 0.081mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.265mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.262mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.261mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 135mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is 228mm; in the object distance infinite 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 radius of curvature of the image side surface 63b of the focusing layer 63 is 135mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is 228mm in the state of an object distance of 1200 mm; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is-165 mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 243.99mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-412.07 mm; in the object distance infinite 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 to the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated here. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example four are given in Table 8 below.

TABLE 7

TABLE 8

Referring to fig. 20 to 23, as can be seen from the (a) optical spherical aberration graphs in fig. 20 to 23, the (B) optical astigmatic graphs in fig. 20 to 23, and the (C) distortion graphs in fig. 20 to 23, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the near-focus (i.e., object distance=150 mm), mid-focus (i.e., object distance=400 mm), far-focus (i.e., object distance=1200 mm), and infinite focal length (i.e., object distance 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), 20 to 23 (B) and 20 to 23 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B) and 5 (C) in the first embodiment, and the description thereof will be omitted here.

Example five

As shown in fig. 24, a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present invention is shown, and 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 sequentially disposed from an object side to an image side along an optical axis O.

Specifically, taking the effective focal length efl=2.62 mm/2.65mm/2.66mm/2.67mm of the optical lens 100 as an example, that is, the EFL is an effective focal length in which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity state, respectively. Specifically, in the near-focus state, efl=2.62 mm; in the mid state, efl=2.65 mm; in the far focus state, efl=2.66 mm; in the object distance infinity state, efl=2.67 mm. The aperture value fno=2.50 of the optical lens 100, the field angle fov= 101.72 ° of the optical lens 100, the total length ttl=4.27 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, and other parameters of the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm) and the object distance infinity state are given in the following table 9, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 9 are all mm, and the refractive index and abbe number in table 9 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

The thickness of the object plane in table 9 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 2 indicates that 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 0.065mm when 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 0.070mm; in the state of 1200mm of 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 0.073mm; in the object distance infinity 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 0.074mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.265mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.262mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.261mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 132mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is-241 mm; in the object distance infinite state, the radius of curvature of the object side face 63a of the focusing layer 63 is-175 mm. The Y radius of the protective film 62 indicates that the radius of curvature of the image side surface 63b of the focusing layer 63 is 132mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is-241 mm in the state of 1200mm of object distance; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is-175 mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 238.75mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-435.56 mm; in the object distance infinite 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 to the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated herein. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example five are given in Table 10 below.

TABLE 9

Table 10

Referring to fig. 25 to 28, as can be seen from the (a) optical spherical aberration graphs in fig. 25 to 28, the (B) optical astigmatic graphs in fig. 25 to 28, and the (C) distortion graphs in fig. 25 to 28, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the near-focus (i.e., object distance=150 mm), mid-focus (i.e., object distance=400 mm), far-focus (i.e., object distance=1200 mm), and infinite focal length (i.e., object distance 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 28 (a), 25 to 28 (B), and 25 to 28 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B), and 5 (C) in the first embodiment, and the descriptions are omitted here.

Example six

As shown in fig. 29, a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present invention is shown, and 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 peripheral region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 peripheral region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and convex at the peripheral region.

Specifically, taking the effective focal length efl=2.78 mm/2.81mm/2.83mm/2.83mm of the optical lens 100 as an example, that is, the EFL is the effective focal length in which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity state, respectively. Specifically, in the near-focus state, efl=2.78 mm; in the mid state, efl=2.81 mm; in the far focus state, efl=2.83 mm; in the object distance infinity state, efl=2.83 mm. The aperture value fno=2.30 of the optical lens 100, the field angle fov= 98.40 ° of the optical lens 100, the total length ttl=4.45 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, and other parameters of the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm) and the object distance infinity state are given in table 11 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 11 are all mm, and the refractive index and abbe number in table 11 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

The thickness of the object plane in table 11 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 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 when the object distance of the optical lens 100 is 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 0.080mm; in the state of 1200mm of 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 0.083mm; in the object distance infinity 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 0.076mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.265mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.262mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.269mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 136mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is-225 mm; in the object distance infinite 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 radius of curvature of the image side surface 63b of the focusing layer 63 is 136mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is-225 mm in the state of an object distance of 1200 mm; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is-160 mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 245.79mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-406.64 mm; in the object distance infinite 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 to the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated here. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example six are given in Table 12 below.

TABLE 11

Table 12

Referring to fig. 30 to 33, as can be seen from the (a) optical spherical aberration graphs in fig. 30 to 33, the (B) optical astigmatisms in fig. 30 to 33, and the (C) distortion graphs in fig. 30 to 33, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the near-focus (i.e., object distance=150 mm), mid-focus (i.e., object distance=400 mm), far-focus (i.e., object distance=1200 mm), and infinite focal length (i.e., object distance 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), 30 to 33 (B), and 30 to 33 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B), and 5 (C) in the first embodiment, and the descriptions are omitted here.

Example seven

As shown in fig. 34, a schematic structural diagram of an optical lens 100 according to a seventh embodiment of the present invention, 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 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 peripheral region; 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 peripheral region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 peripheral region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and convex at the peripheral region.

Specifically, taking the effective focal length efl=2.86 mm/2.90mm/2.92mm/2.93mm of the optical lens 100 as an example, that is, the EFL is an effective focal length at which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity state (i.e., object distance infinity), respectively. Specifically, in the near-focus state, efl=2.86 mm; in mid state, efl=2.90 mm; efl=2.92 mm in the far focus state; in the object distance infinity state, efl=2.93 mm. The aperture value fno=2.20 of the optical lens 100, the field angle fov= 96.62 ° of the optical lens 100, the total length ttl=4.59 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, and other parameters of the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm) and the object distance infinity state are given in the following table 13, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 13 are all mm, and the refractive index and abbe number in table 13 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

The thickness of the object plane in table 13 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 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 when the object distance of the optical lens 100 is 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 0.080mm; in the state of 1200mm of 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 0.083mm; in the object distance infinity 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 0.084mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.265mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.262mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.261mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 137mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is-220 mm; in the object distance infinite 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 radius of curvature of the image side surface 63b of the focusing layer 63 is 137mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is-220 mm in the state of 1200mm of object distance; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is-160 mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 247.60mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-397.61 mm; in the object distance infinite 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 to the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated herein. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example seven are given in Table 14 below.

TABLE 13

TABLE 14

Referring to fig. 35 to 38, as can be seen from the (a) optical spherical aberration graphs in fig. 35 to 38, the (B) optical astigmatic graphs in fig. 35 to 38, and the (C) distortion graphs in fig. 35 to 38, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the near-focus (i.e., object distance=150 mm), mid-focus (i.e., object distance=400 mm), far-focus (i.e., object distance=1200 mm), and infinite focal length (i.e., object distance 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), 35 to 38 (B), and 35 to 38 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B), and 5 (C) in the first embodiment, and the description thereof will be omitted here.

Example eight

As shown in fig. 39, a schematic structural diagram of an optical lens 100 according to an eighth embodiment of the present invention, 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 first lens L1 has positive power, the second lens L2 has negative power, the third lens L3 has positive power, the fourth lens L4 has positive power, and the fifth lens L5 has 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 peripheral region; 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 peripheral region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 convex and concave at the peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the peripheral region O, respectively.

Specifically, taking the effective focal length efl=3.19 mm/3.24mm/3.26mm/3.27mm of the optical lens 100 as an example, that is, the EFL is the effective focal length in which the optical lens 100 is in a near-focus state (i.e., object distance=150 mm), a mid-focus state (conventional state, i.e., object distance=400 mm), a far-focus state (i.e., object distance=1200 mm), and an object distance infinity state, respectively. Specifically, in the near-focus state, efl=3.19 mm; in mid state, efl=3.24 mm; efl=3.26 mm in the far focus state; in the object distance infinity state, efl=3.27 mm. The aperture value fno=2.50 of the optical lens 100, the field angle fov=90.20° of the optical lens 100, the total length ttl=5.24 mm of the optical lens 100, the radius imgh=3.24 mm of the maximum effective imaging circle of the optical lens 100, and other parameters of the optical lens 100 in the near-focus state (i.e., object distance=150 mm), the mid-focus state (i.e., object distance=400 mm), the far-focus state (i.e., object distance=1200 mm) and the object distance infinity state are given in the following table 15, and the definition of each parameter can be obtained from the description of the foregoing embodiments, and will not be repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 15 are all mm, and the refractive index and abbe number in table 15 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

The thickness of the object plane in table 15 indicates the distance between the object and the optical lens 100, i.e., the object distance. The thickness of the surface No. 2 indicates that 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 0.125mm when the object distance of the optical lens 100 is 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 1.130mm; in the state of 1200mm of 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 0.132mm; in the object distance infinity 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 0.133mm. 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 where the object distance of the optical lens 100 is 150 mm; the thickness of the protective film 62 on the optical axis O is 0.270mm in the state of an object distance of 400 mm; the thickness of the protective film 62 on the optical axis O is 0.268mm in the state of an object distance of 1200 mm; in the object distance infinite state, the thickness of the protective film 62 on the optical axis O is 0.267mm. The Y radius of the focusing layer 63 indicates that the radius of curvature of the object side surface 63a of the focusing layer 63 is 112mm 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 radius of curvature of the object side surface 63a of the focusing layer 63 is infinite; in the state of 1200mm of object distance, the radius of curvature of the object side surface 63a of the focusing layer 63 is-320 mm; in the object distance infinite 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 radius of curvature of the image side surface 63b of the focusing layer 63 is 112mm in the state where the object distance of the optical lens 100 is 150 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is infinite in a state of an object distance of 400 mm; the radius of curvature of the image side surface 63b of the focusing layer 63 is-320 mm in the state of 1200mm of object distance; in the object distance infinite state, the radius of curvature of the image side face 63b of the focusing layer 63 is-210 mm. The focal length of the focusing layer 63 and the protective film 62 means that in the state of an object distance of 150mm, the combined focal length of the focusing layer 63 and the protective film 62 is 202.42mm; the combined focal length of the focusing layer 63 and the protective film 62 is 0.00mm in the object distance 400mm state; in the state of 1200mm of object distance, the combined focal length of the focusing layer 63 and the protective film 62 is-578.34 mm; in the object distance infinite 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 to the fifth lens element L5 are aspheric, and the method for calculating the surface shape x of each aspheric lens element can be obtained by the above description of the embodiments, which is not repeated here. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example eight are given in Table 16 below.

TABLE 15

Table 16

Referring to fig. 40 to 43, as can be seen from the (a) optical spherical aberration graphs in fig. 40 to 43, the (B) optical astigmatic graphs in fig. 40 to 43, and the (C) distortion graphs in fig. 40 to 43, the optical system 100 has good control of longitudinal spherical aberration, astigmatism, and distortion in the near-focus (i.e., object distance=150 mm), mid-focus (i.e., object distance=400 mm), far-focus (i.e., object distance=1200 mm), and infinite focal length (i.e., object distance 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. 40 to 43 (a), 40 to 43 (B) and 40 to 43 (C), reference may be made to the descriptions in fig. 5 (a), 5 (B) and 5 (C) in the first embodiment, and the description thereof will be omitted here.

Referring to Table 17, table 17 is a summary of the ratios of the relationships 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 an image capturing module 200, where the image capturing 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 on 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. It can be appreciated that, with the image capturing module 200 of the optical lens 100, the design requirements of wide view, small distortion and rapid focusing of the image capturing module 200 can be achieved, and the imaging quality of the image capturing module 200 is improved.

In a third aspect, referring to fig. 45, the invention further discloses an electronic device 300, where the electronic device 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 appreciated that the electronic device 300 with the camera module 200 can realize the design requirements of wide view, small distortion and quick focusing of the electronic device 300, and improve the imaging quality of the electronic device 300.

The above describes an optical lens, a camera module and an electronic device in detail, and specific examples are applied to illustrate the principles and implementation of the present invention, and the above description of the embodiments is only used to help understand the optical lens, the camera module and the electronic device of the present invention and their core ideas; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

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

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

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

2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 0.1< ai rL1/TTL <0.2;

wherein air l1 is a distance between the image side surface of the first lens element and the object side surface of the second lens element on the optical axis, and TTL is a distance between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis.

3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 1.2< TTL/EFL <1.65;

wherein TTL is a distance from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, and EFL is an effective focal length of the optical lens.

4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 1< EFL/f1<1.5;

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

5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 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. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 0.25< ETL3/CTL3<0.5;

wherein ETL3 is a distance between a maximum effective half-caliber of an object side surface of the third lens and a maximum effective half-caliber of an image side surface of the third lens along the optical axis direction, and CTL3 is a thickness of the third lens on the optical axis.

7. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 1.2< DL5/DL4<1.4;

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

8. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 0.5< rad (FOV)/fno <1;

Wherein RAD (FOV) is the radian value of the maximum field angle of the optical lens, and fno is the f-number of the optical lens.

9. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: -0.6mm < (r7×r8)/(r7+r8) < -0.1mm;

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

10. An imaging module comprising an image sensor and an optical lens according to any one of claims 1 to 9, 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.