CN113933967B

CN113933967B - Optical lens, camera module and electronic equipment

Info

Publication number: CN113933967B
Application number: CN202111201283.2A
Authority: CN
Inventors: 张文燕; 杨健; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2023-07-04
Anticipated expiration: 2041-10-14
Also published as: CN113933967A

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis; the optical lens satisfies the following relation: 0.6/mm < FNO/ImgH <0.9/mm, thereby reasonably controlling the ratio of the f-number to the effective imaging circle radius of the optical lens, ensuring that the optical lens has smaller f-number and larger effective imaging circle radius while realizing miniaturized design, further improving the light inlet amount of the optical lens, and simultaneously enabling the optical lens to be matched with a photosensitive chip with larger photosensitive area when being applied to a camera module, so as to ensure that the optical lens has imaging effect of higher pixels while meeting miniaturized design and improving the imaging definition.

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 miniaturization of electronic devices, optical lenses integrated in the electronic devices are also required to be miniaturized. However, how to improve the imaging definition of an optical lens while satisfying the miniaturization design of the optical lens is a problem to be solved.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, wherein the optical lens can be miniaturized and has higher imaging definition.

In order to achieve the above object, in a first aspect, an embodiment of the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side to an image side along an optical axis; the first lens element with positive refractive power has a convex object-side surface at a paraxial region; the second lens element with refractive power has a convex object-side surface at a paraxial region; the third lens element, the fourth lens element and the fifth lens element each have refractive power, and an image-side surface of the fourth lens element is convex at a paraxial region; the optical lens satisfies the following relation: 0.6/mm < FNO/ImgH <0.9/mm; wherein FNO is the f-number of the optical lens, and ImgH is the radius of the effective imaging circle of the optical lens. The optical lens meets the relation, and the proportion of the f-number to the effective imaging circle radius of the optical lens can be reasonably controlled, so that the optical lens is ensured to realize miniaturized design and has smaller f-number and larger effective imaging circle radius. The light quantity of the optical lens can be improved by setting a smaller diaphragm number, so that the imaging definition of the optical lens is improved, and particularly, the imaging effect of the optical lens in a dark light environment can be enhanced, so that the optical lens can be suitable for shooting in the dark light environment such as night scenes, rainy days, starry sky and the like, and the shooting requirement of customers on the dark light environment is met. In addition, because the optical lens also has a larger imaging circle radius, when the optical lens is applied to the camera module, the larger effective imaging circle radius can be matched with a photosensitive chip with larger photosensitive area, so that the optical lens can meet the miniaturization design and has a higher imaging effect of pixels at the same time, and the imaging definition is improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.3< ET1/CT1<0.8; wherein ET1 is the distance from the maximum effective aperture of the object side surface of the first lens to the maximum effective aperture of the image side surface of the first lens in the optical axis direction, i.e. the edge thickness of the first lens, and CT1 is the thickness of the first lens on the optical axis, i.e. the center thickness of the first lens. Because the first lens is closest to the object side and is mainly used for collecting the optical information from the object space to the image space, the curvature of the surface type of the first lens can be effectively controlled by reasonably controlling the ratio of the edge thickness to the center thickness of the first lens, so that the range of the first lens for collecting light is more reasonable, namely, the optical lens is controlled to have a reasonable angle of view. In addition, the situation that the processing sensitivity of the first lens is high due to the fact that the edge thickness of the first lens is too thin relative to the center thickness can be avoided, and the processing difficulty of the first lens is reduced.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.8< Σet/Σct <1.2 and 0.8< ET3/CT3<2; wherein Σet is the sum of distances from the maximum effective aperture of the object side surface of each lens in the optical lens to the maximum effective aperture of the image side surface in the optical axis direction, Σct is the sum of distances from the object side surface of each lens in the optical lens to the image side surface in the optical axis direction, ET3 is the distance from the maximum effective aperture of the object side surface of the third lens to the maximum effective aperture of the image side surface of the third lens in the optical axis direction, and CT3 is the thickness of the third lens on the optical axis. Because 0.8< ΣET/ΣCT <1.2, the ratio of the sum of the edge thicknesses of the five lenses of the optical lens to the sum of the center thicknesses of the five lenses of the optical lens can be reasonably controlled, and the balance of the optical path difference of paraxial rays and edge rays of the optical lens is facilitated, so that the field curvature is effectively improved, and the distortion of the optical lens is reduced. Meanwhile, as 0.8< ET3/CT3<2, the ratio of the edge thickness to the center thickness of the third lens can be reasonably controlled, so that the optical path difference between the edge light and the paraxial light of the optical lens can be effectively balanced, and the field curvature of the optical lens can be corrected. In addition, the processing sensitivity of the third lens can be reduced, so that the processing difficulty is reduced, and the production yield of the optical lens is improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2<f/f1<3; wherein f is an effective focal length of the optical lens, and f1 is a focal length of the first lens. By reasonably controlling the ratio of the effective focal length of the optical lens to the focal length of the first lens, the aberration generated by the first lens can be effectively corrected, so that the shooting definition is improved, the processing sensitivity of the optical lens can be ensured to be lower, and the processing difficulty of the optical lens can be reduced.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -2< (r3+r4)/f2 < -0.05; wherein R3 is a radius of curvature of the object side surface of the second lens element at the optical axis, R4 is a radius of curvature of the image side surface of the second lens element at the optical axis, and f2 is a focal length of the second lens element. By reasonably configuring the curvature radius of the object side surface and the image side surface of the second lens at the optical axis and the focal length of the second lens, the optical path difference between the marginal light and the paraxial light of the optical lens can be balanced, the field curvature and the astigmatism generated by the first lens can be corrected, the processing sensitivity of the optical lens can be reduced, and the production yield of the optical lens can be improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.5< imgh x fno/TTL <1.1; the TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, that is, the total length of the optical lens. Because 0.5< ImgH/TTL < FNO <1.1, the effective imaging radius of the optical lens, the total length of the optical lens and the proportion of the f-number can be reasonably controlled, so that the optical lens can be ensured to have a larger imaging surface, and the miniaturized design of the optical lens can be satisfied, in addition, the light flux of the optical lens can be controlled by controlling the f-number, and the shooting definition of the optical lens is improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0< Alt-Agt <0.09mm; wherein Alt is the longest distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element parallel to the optical axis direction, i.e., the maximum air gap between the fourth lens element and the fifth lens element, and Agt is the shortest distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element parallel to the optical axis direction, i.e., the minimum air gap between the fourth lens element and the fifth lens element. The difference between the maximum air gap and the minimum air gap of the fourth lens and the fifth lens is controlled to be 0-0.09 mm, namely, the surface type difference between the image side surface of the fourth lens and the object side surface of the fifth lens is controlled to be smaller, so that the processing sensitivity of the image side surface of the fourth lens and the object side surface of the fifth lens is lower, and the production yield of the optical lens is further improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 4< | (R1-R2)/f1| <16; wherein R1 is a radius of curvature of the object side surface of the first lens element at the optical axis, R2 is a radius of curvature of the image side surface of the first lens element at the optical axis, and f1 is a focal length of the first lens element. By reasonably controlling the ratio of the curvature radius of the object side surface and the curvature radius of the image side surface of the first lens to the focal length of the first lens, the optical lens can have a more reasonable field angle. In addition, the object side surface and the image side surface of the first lens can be effectively controlled, so that the processing sensitivity of the first lens is reduced, the processing difficulty of the first lens is reduced, and the optical lens is guaranteed to have better production yield.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes a photosensitive chip and the optical lens described in the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens of the first aspect has all the technical effects of the optical lens of the first aspect, namely, the optical lens has smaller f-number while ensuring that the optical lens realizes miniaturized design by reasonably controlling the ratio of the f-number to the effective imaging radius of the optical lens, thereby improving the light entering quantity of the optical lens and the imaging definition of the optical lens. The optical lens can also have larger effective imaging circle radius, and the imaging definition of the optical lens is further improved.

In a third aspect, the present invention discloses an electronic device, which includes the camera module set described in the second aspect, where the camera module set is disposed on the housing. The electronic device having the image capturing module according to the second aspect also has all the technical effects of the optical lens according to the first aspect. That is, the optical lens of the electronic device has a smaller f-number while ensuring that the optical lens is designed in a miniaturized manner by reasonably controlling the ratio of the f-number to the effective imaging circle radius of the optical lens, so that the light inlet amount of the optical lens is improved, and the imaging definition of the optical lens is improved. The optical lens can also have larger effective imaging circle radius, and the imaging definition of the optical lens is further improved.

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

by means of the optical lens, the camera module and the electronic equipment, the first lens is provided with positive refractive power, light rays in a small angle are facilitated to be stably converged into the optical lens, meanwhile, the object side surface of the first lens is convex at the optical axis, light rays can be converged, meanwhile, the aperture of the first lens is facilitated to be increased, the optical lens is guaranteed to obtain enough light entering quantity, and further large aperture characteristics are achieved, and shooting definition is facilitated to be improved. The object side surface of the second lens and the image side surface of the fourth lens are convex at the paraxial region, so that light rays can be better converged, the angle of the incident light rays entering the optical lens is reduced, the light rays can be smoothly transited to the third lens, the long-focus performance can be realized, and the total length of the optical lens can be shortened. In addition, the image side surface of the fourth lens element is convex at a paraxial region, which is beneficial to increasing the incident angle of light entering the fourth lens element and balancing chromatic aberration and astigmatism generated by the first three lens elements. Because the optical lens meets the condition that FNO/ImgH is less than 0.9/mm and the aperture number and the effective imaging radius of the optical lens are reasonably controlled, the optical lens is ensured to realize miniaturized design and has smaller aperture number and larger effective imaging radius. The light quantity of the optical lens can be improved by setting a smaller diaphragm number, imaging definition of the optical lens is improved, and particularly imaging effect of the optical lens in a dark light environment can be enhanced, so that the optical lens can be suitable for shooting in the dark light environment such as night scenes, rainy days, starry sky and the like, and shooting requirements of customers on the dark light environment are met. In addition, because the optical lens also has a larger imaging circle radius, when the optical lens is applied to the camera module, the larger effective imaging circle radius can be matched with a photosensitive chip with larger photosensitive area, so that the optical lens can meet the miniaturization design and has a higher imaging effect of pixels at the same time, and the imaging definition is improved.

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 view of the structure of an optical lens disclosed in the present application;

fig. 2 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the first embodiment of the present application;

FIG. 3 is a schematic view of an optical lens disclosed in a second embodiment of the present application;

fig. 4 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the second embodiment of the present application;

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

fig. 6 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the third embodiment of the present application;

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

fig. 8 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the fourth embodiment of the present application;

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

fig. 10 is a light ray spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of an optical lens disclosed in the fifth embodiment of the present application;

FIG. 11 is a schematic view of the structure of the camera module disclosed in the present application;

fig. 12 is a schematic structural view of an electronic device disclosed in the present application.

Detailed Description

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, the present application discloses an optical lens 100, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, which are disposed in order from an object side to an image side along an optical axis o. In imaging, light enters 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 in order from the object-side surface S1 of the first lens element L1, and finally is imaged on the imaging surface 101 of the optical lens 100. Wherein the first lens element L1 has positive refractive power, and the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 each have positive refractive power (i.e., the refractive power can be positive or negative).

Further, the object-side surface S1 of the first lens element L1 is convex at a paraxial region o, the object-side surface S3 of the second lens element L2 is convex at the paraxial region o, and the image-side surface S6 of the fourth lens element L4 is convex at the paraxial region o.

Through setting up first lens L1 and having positive refractive power, be favorable to converging optical lens 100 in the light stability of low-angle, simultaneously, first lens L1 'S thing side S1 is convex in optical axis o department, can assemble light, is favorable to increasing first lens L1' S bore simultaneously, guarantees that optical lens 100 obtains sufficient light inlet quantity, and then realizes big aperture characteristic, is favorable to improving shooting definition. By providing the object-side surface S3 of the second lens element L2 and the image-side surface S6 of the fourth lens element L4 with convex surfaces at the paraxial region o, the total length of the optical lens assembly 100 can be reduced.

It is contemplated that the optical lens 100 may be applied to an electronic device such as an in-vehicle apparatus, a car recorder, or the like, or to an automobile. When the optical lens 100 is used as a camera on an automobile body, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be glass, so that the optical lens 100 has good optical effect and the influence of temperature on the lenses can be reduced. Of course, among the plurality of lenses of the optical lens 100, a part of the lenses may be made of glass, and a part of the lenses may be made of plastic, so that the processing cost of the lenses and the weight of the lenses can be reduced while the influence of the reduced temperature on the lenses is ensured to achieve a better imaging effect, thereby reducing the processing cost of the optical lens 100 and the overall weight of the optical lens 100.

In addition, it can be appreciated that when the optical lens 100 is applied to an electronic device such as a smart phone, a smart tablet, etc., the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be plastic, so as to reduce the overall weight of the optical lens 100.

Alternatively, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be spherical or aspherical. Of course, part of the lenses can be spherical, and part of the lenses are aspheric, so that the processing difficulty of the lenses can be reduced by adopting the aspheric design, and the surface type of the lenses can be easily controlled.

In some embodiments, the optical lens 100 further includes a diaphragm 102, and the diaphragm 102 may be an aperture diaphragm or a field diaphragm, which may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1. It is to be understood that in other embodiments, the diaphragm 102 may be disposed between two adjacent lenses, for example, between the fourth lens L4 and the fifth lens L5, and the disposed position of the diaphragm 102 may be adjusted according to the actual situation, which is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 further includes an optical filter L6, such as an ir cut filter, disposed between the image side surface S10 of the fifth lens L5 and the imaging surface 101 of the optical lens 100, so as to filter out the infrared light, but only allow the visible light to pass through, so as to avoid the problem of imaging distortion caused by the infrared light passing through the optical lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.6/mm < FNO/ImgH <0.9/mm, wherein FNO is the f-number of the optical lens 100 and ImgH is the radius of the effective imaging circle of the optical lens 100. Since the optical lens 100 satisfies 0.6/mm < FNO/ImgH <0.9/mm, the small aperture number and the large effective imaging radius of the optical lens 100 are ensured while the miniaturized design of the optical lens 100 is realized by reasonably controlling the ratio of the aperture number to the effective imaging radius of the optical lens 100. The light quantity of the optical lens 100 can be improved by setting a smaller f-number, the imaging definition of the optical lens 100 is improved, and particularly, the imaging effect of the optical lens 100 in a dark light environment can be enhanced, so that the optical lens 100 can be suitable for shooting in the dark light environment such as night scenes, rainy days, starry sky and the like, and the shooting requirement of customers on the dark light environment is met. In addition, since the optical lens 100 further has a larger imaging radius, when the optical lens 100 is applied to an image capturing module, the larger effective imaging radius can be matched with a photosensitive chip with a larger photosensitive area, so that the optical lens 100 can meet the miniaturization design and has a higher imaging effect of pixels, and the imaging definition is improved. When FNO/ImgH is more than or equal to 0.9/mm, the aperture number of the optical lens 100 is too large, the light incoming quantity is smaller, so that insufficient brightness is caused, the imaging quality is affected, in addition, the effective imaging radius of the optical lens 100 is smaller, when the optical lens 100 is applied to an imaging module, a photosensitive chip with a larger size is difficult to match, the imaging pixels are lower, and the imaging effect is poor. When FNO/ImgH is less than or equal to 0.6/mm, the aperture number of the optical lens 100 is too small, the light inlet amount is too large, and the exposure is too large, so that the imaging quality is affected.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.3< ET1/CT1<0.8, wherein ET1 is the distance from the maximum effective aperture of the object side surface S1 of the first lens L1 to the maximum effective aperture of the image side surface S2 of the first lens L1 in the optical axis direction, i.e. the edge thickness of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis o, i.e. the center thickness of the first lens L1. Since the first lens L1 is closest to the object side and is mainly used for collecting the light information from the object space to the image space, the curvature of the surface of the first lens L1 can be effectively controlled by controlling the ratio of the edge thickness to the center thickness of the first lens L1 between 0.3 and 0.8, so that the range of light collection of the first lens L1 is more reasonable, i.e., the optical lens 100 is controlled to have a reasonable angle of view. In addition, it is also possible to avoid that the processing sensitivity of the first lens L1 is high due to the fact that the edge thickness of the first lens L1 is too thin with respect to the center thickness, that is, by controlling the ratio of the edge thickness to the center thickness of the first lens L1 to be between 0.3 and 0.8, the processing sensitivity of the first lens L1 can be reduced, thereby improving the production yield of the first lens L1 and ensuring the imaging stability of the optical lens 100. When ET1/CT1 is greater than or equal to 0.8, the thickness of the edge of the first lens is too large relative to the thickness of the center, which results in an increase in the effective focal length of the first lens L1, which is not beneficial to collecting the light entering the optical lens 100, resulting in a smaller angle of view of the optical lens 100. When ET1/CT1 is less than or equal to 0.3, the edge thickness of the first lens is too small, so that the processing difficulty of the first lens L1 is relatively high, and the production yield of the first lens L1 is difficult to ensure.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8< Σet/Σct <1.2 and 0.8< ET3/CT3<2, wherein Σet is the sum of distances from the maximum effective aperture of the object side surface to the image side surface of each lens in the optical axis direction, that is, the sum of edge thicknesses of each lens in the optical lens 100, Σct is the sum of distances from the object side surface to the image side surface of each lens in the optical lens, ET3 is the distance from the maximum effective aperture of the object side surface to the image side surface of the third lens in the optical axis direction, CT3 is the sum of thicknesses of the third lens in the optical axis, that is, the sum of center thicknesses of each lens in the optical lens 100. Because 0.8< ΣET/ΣCT <1.2, the ratio of the sum of the edge thicknesses of the five lenses of the optical lens 100 to the sum of the center thicknesses of the optical lens 100 can be reasonably controlled, and the balance of the optical path difference between paraxial rays and edge rays of the optical lens 100 is facilitated, so that the field curvature is effectively improved, and the distortion of the optical lens 100 is reduced. When sigma ET/sigma CT is more than or equal to 1.2, the sum of the edge thicknesses of the five lenses is too large, so that the optical path of edge light is too large compared with that of paraxial light, the field curvature is too large, and the image of the edge view field is blurred. When sigma ET/sigma CT is less than or equal to 0.8, the ratio of the optical path of the marginal light to the optical path of the paraxial light is too small, and the field curvature is too large, so that the image of the marginal field of view is blurred. Meanwhile, as 0.8< ET3/CT3<2, the ratio of the edge thickness to the center thickness of the third lens L3 can be reasonably controlled, so that the optical path difference between the edge light and the paraxial light of the optical lens 100 can be effectively balanced to correct the field curvature of the optical lens 100. In addition, the processing sensitivity of the third lens L3 can be reduced, so as to reduce the processing difficulty and improve the production yield of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 2<f/f1<3, where f is the effective focal length of the optical lens 100 and f1 is the focal length of the first lens L1. Because 2<f/f1<3, the ratio of the effective focal length of the optical lens 100 to the focal length of the first lens L1 can be reasonably controlled, and the aberration generated by the first lens L1 can be effectively corrected, so that the shooting definition is improved, the processing sensitivity of the optical lens 100 can be ensured to be lower, the processing difficulty of the optical lens 100 is reduced, and the production yield of the optical lens 100 is improved. When f/f1 is greater than or equal to 3, the effective focal length of the first lens L1 is too small, the focusing capability of light is too strong, which results in increased processing sensitivity of the optical lens 100, greater processing difficulty, and greater aberration correction difficulty generated by the first lens L1, which results in lower shooting definition. When f/f1 is less than or equal to 2, the effective focal length of the first lens L1 is too large, which is not good for collecting the light entering the optical lens 100 due to insufficient converging ability of the light, resulting in a smaller angle of view of the optical lens 100, and it is also difficult to correct the aberration generated by the first lens L1, resulting in lower resolution of photographing.

In some embodiments, the optical lens 100 satisfies the following relationship: -2< (r3+r4)/f 2< -0.05, wherein R3 is a radius of curvature of the object side surface S3 of the second lens L2 at the optical axis o, R4 is a radius of curvature of the image side surface S4 of the second lens L2 at the optical axis o, and f2 is a focal length of the second lens L2. Because-2 < (R3+R4)/f 2< -0.05, the curvature radius of the object side surface S3 and the image side surface S4 of the second lens L2 at the optical axis o and the focal length of the second lens L2 can be reasonably configured, so that the optical path difference between the marginal light ray and the paraxial light ray of the optical lens 100 can be balanced, the correction of the curvature of field and the astigmatism generated by the first lens L1 is facilitated, the processing sensitivity of the optical lens 100 is reduced, and the production yield of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5< imgh x fno/TTL <1.1, wherein TTL is the distance between the object side surface of the first lens L1 and the imaging surface of the optical lens 100 on the optical axis o, i.e. the total length of the optical lens 100. Since 0.5< imgh×fno/TTL <1.1, the effective imaging radius of the optical lens 100, the total length of the optical lens 100, and the ratio of f-numbers can be reasonably controlled, so that the optical lens 100 can be ensured to have a large imaging surface (i.e., the effective imaging radius of the optical lens 100), and the miniaturized design of the optical lens 100 can be satisfied, and in addition, the light flux of the optical lens 100 can be controlled by controlling the f-numbers, thereby improving the shooting definition of the optical lens 100. When ImgH is greater than or equal to 1.1, the f-number of the optical lens 100 is larger, the light flux is smaller, so that the brightness is too small, the imaging quality is affected, the total length of the optical lens 100 is too small, the arrangement among the lenses is compact, and the aberration correction of the optical lens 100 is not facilitated. When ImgH is less than or equal to 0.5, the f-number of the optical lens 100 is smaller, the light passing amount is too large, so that the exposure is too large, and the imaging quality is affected. In addition, the overall length of the optical lens 100 is too long, which is disadvantageous in realizing the miniaturized design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0< Alt-Agt <0.09mm, wherein Alt is the longest distance of the air gap between the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 parallel to the optical axis o direction, i.e., the maximum air gap between the fourth lens L4 and the fifth lens L5, and Agt is the shortest distance of the air gap between the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 parallel to the optical axis o direction, i.e., the minimum air gap between the fourth lens L4 and the fifth lens L5. By controlling the difference between the maximum air gap and the minimum air gap of the fourth lens element L4 and the fifth lens element L5 to be between 0 mm and 0.09mm, that is, controlling the surface type phase difference between the image side surface S8 of the fourth lens element L4 and the object side surface S9 of the fifth lens element L5 to be smaller, the processing sensitivity of the image side surface S8 of the fourth lens element L4 and the object side surface S9 of the fifth lens element L5 is lower, and the production yield of the optical lens 100 is improved. When Alt-Agt is greater than or equal to 0.09mm, the image side S8 of the fourth lens element L4 and the object side S9 of the fifth lens element L5 have larger surface type differences, which results in higher processing sensitivity of the image side S8 of the fourth lens element L4 and the object side S9 of the fifth lens element L5, and higher processing difficulty, thereby affecting the production yield of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 4< | (R1-R2)/f 1| <16, wherein R1 is a radius of curvature of the object side surface S1 of the first lens L1 at the optical axis o, R2 is a radius of curvature of the image side surface S2 of the first lens L1 at the optical axis o, and f1 is a focal length of the first lens L1. Because 4< | (R1-R2)/f1| <16, the ratio of the radius of curvature of the object-side surface S1 and the radius of curvature of the image-side surface S2 of the first lens L1 to the focal length of the first lens L1 can be reasonably controlled, so that the optical lens 100 can have a more reasonable angle of view. In addition, the surface types of the object side surface S1 and the image side surface S2 of the first lens element L1 can be effectively controlled, so as to reduce the processing sensitivity of the first lens element L1 and reduce the processing difficulty of the first lens element L1, thereby ensuring that the optical lens 100 has a better production yield. When | (r1+r2)/f1|is not less than 16, the absolute value of the radius of curvature of the image side surface S2 of the first lens L1 at the optical axis o is too large, resulting in too flat surface, reducing the light-condensing capability of the first lens L1, being unfavorable for large-angle light to enter the optical lens 100, and being difficult to meet the requirement of the optical lens 100 on the shooting range. When (R1+R2)/f1|is less than or equal to 4, the absolute value of the curvature radius of the image side surface S2 of the first lens L1 at the optical axis o is too small, so that the surface type bending degree of the image side surface S2 of the first lens L1 is larger, and the processing difficulty is improved.

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

First embodiment

As shown in fig. 1, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6, which are disposed in order from an object side to an image side along an optical axis o. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be described in the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region o, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the peripheral region. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the peripheral region o, respectively. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the paraxial region o, respectively, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the peripheral region. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex at the paraxial region o, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave at the peripheral region. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave at the paraxial region o, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex at the peripheral region.

Specifically, taking the effective focal length f=16.84 mm of the optical lens 100, the aperture size fno=3.5 of the optical lens 100, the field angle fov=26.8 deg of the optical lens 100, and the total optical length ttl=15.2 mm of the optical lens 100 as examples, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side along the optical axis o of the optical lens 100 are sequentially arranged in the order of the elements from top to bottom in table 1. 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 S1 and the image side surface S2 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object or image side of the corresponding surface number at the paraxial region o. The first value in the "thickness" parameter row 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 diaphragm 102 in the "thickness" parameter row is the distance between the diaphragm 102 and the vertex of the subsequent surface (the vertex refers to the intersection point of the surface and the optical axis o) on the optical axis o, and the direction from the object side surface S1 of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis o by default, when the value is negative, the diaphragm 102 is indicated to be arranged on the right side of the vertex of the subsequent surface, and when the thickness of the diaphragm 102 is positive, the diaphragm 102 is arranged on the left side of the vertex of the subsequent surface. It is understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 1 was 587.6nm.

TABLE 1

In the first embodiment, the object-side surface and the image-side surface of the first lens element L1 to the fifth lens element L5 are aspheric, and the surface shape x of the 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 paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of the radius R of Y in table 1 above); k is a conic coefficient; ai is a correction coefficient corresponding to the i-th higher term of the aspherical surface. Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors S1-S10 in the first embodiment.

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows the optical spherical aberration diagrams of the optical lens 100 of the first embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 2 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the optical lens 100 in the first embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587nm 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. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2 (C), fig. 2 (C) is a graph of distortion of the optical lens 100 at a wavelength of 587nm 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. As can be seen from (C) of fig. 2, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Second embodiment

Referring to fig. 3, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6 disposed along an optical axis o from an object side to an image side. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be described in the above embodiments, and will not be described herein.

Further, the first lens element L1 and the second lens element L2 each have positive refractive power, and the third lens element L3, the fourth lens element L4 and the fifth lens element L5 each have negative refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region o, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the peripheral region. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex at the paraxial region o, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the peripheral region. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are concave at the paraxial region o, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the peripheral region. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave at the peripheral region. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex at the paraxial region o, respectively, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave at the peripheral region.

In the second embodiment, the effective focal length f=14.27 mm of the optical lens 100, the aperture size fno=3.0 of the optical lens 100, the fov=29.68 deg of the field angle of the optical lens 100, and the total optical length ttl=14.36 mm of the optical lens 100 are taken as examples.

The other parameters in the second embodiment are given in the following table 3, and the definition of the parameters can be obtained from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 3 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 3 was 587.6nm.

TABLE 3 Table 3

In the second embodiment, table 4 gives the higher order coefficients that can be used for each aspherical surface in the second embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 4 Table 4

Referring to fig. 4 (a), fig. 4 (a) shows the optical spherical aberration diagrams of the optical lens 100 in the second embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 4 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 4 (a), the optical lens 100 in the second embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 4 (B), fig. 4 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587nm in the second 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. 4 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 4 (C), fig. 4 (C) is a graph showing a distortion curve of the optical lens 100 at a wavelength of 587nm in the second 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. As can be seen from (C) in fig. 4, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Third embodiment

Referring to fig. 5, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6 disposed along an optical axis o from an object side to an image side. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be described in the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, and the third lens element L3 with positive refractive power, and the fourth lens element L4 with positive refractive power and the fifth lens element L5 with positive refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave at the paraxial region o, respectively, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the peripheral region o, respectively. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the paraxial region o, respectively, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the peripheral region. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex at the paraxial region o, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex at the peripheral region. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave at the paraxial region o, respectively, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex at the peripheral region.

In the third embodiment, the effective focal length f=15.8 mm of the optical lens 100, the aperture size fno=3.20 of the optical lens 100, the field angle fov=29.89 deg of the optical lens 100, and the total optical length ttl=14.82 mm of the optical lens 100 are taken as examples.

The other parameters in the third embodiment are given in the following table 5, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 5 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 5 was 587.6nm.

TABLE 5

In the third embodiment, table 6 gives the higher order coefficients that can be used for each aspherical surface in the third embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 6 (a), fig. 6 (a) shows the optical spherical aberration diagrams of the optical lens 100 in the third embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 6 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 6 (a), the optical lens 100 in the third embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 6 (B), fig. 6 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587nm in the third 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. 6 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 6 (C), fig. 6 (C) is a graph showing a distortion curve of the optical lens 100 at a wavelength of 587nm according to the third 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. As can be seen from (C) in fig. 6, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Fourth embodiment

Referring to fig. 7, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6 disposed along an optical axis o from an object side to an image side. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be described in the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, and both the fourth lens element L4 and the fifth lens element L5 with negative refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave at the paraxial region o, respectively, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are concave at the peripheral region. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex at the paraxial region o, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex at the peripheral region. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave at the peripheral region. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave at the paraxial region o, respectively, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex at the peripheral region.

In the fourth embodiment, the effective focal length f=14.40 mm of the optical lens 100, the aperture size fno=2.80 of the optical lens 100, the field angle fov=29.95 deg of the optical lens 100, and the total optical length ttl=14.31 mm of the optical lens 100 are taken as examples.

The other parameters in the fourth embodiment are given in the following table 7, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 7 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 7 was 587.6nm.

TABLE 7

In the fourth embodiment, table 8 gives the higher order term coefficients that can be used for each aspherical surface in the fourth embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

TABLE 8

Referring to fig. 8 (a), fig. 8 (a) shows the optical spherical aberration diagrams of the optical lens 100 in the fourth embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 8 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 8 (a), the optical lens 100 in the fourth embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 8 (B), fig. 8 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587nm in the fourth 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. 8 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 8 (C), fig. 8 (C) is a distortion curve diagram of the optical lens 100 of the fourth embodiment at a wavelength of 587. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 8 (C), at the wavelength 587, the distortion of the optical lens 100 can be corrected.

Fifth embodiment

Referring to fig. 9, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6 disposed along an optical axis o from an object side to an image side. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be described in the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 and the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region o, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the peripheral region. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the peripheral region o, respectively. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the paraxial region o, respectively, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the peripheral region. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave at the peripheral region o, respectively. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave at the paraxial region o, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave at the peripheral region.

In the fifth embodiment, the effective focal length f=16.17 mm of the optical lens 100, the aperture size fno=3.5 of the optical lens 100, the field angle fov=26.75 deg of the optical lens 100, and the total optical length ttl=14.28 mm of the optical lens 100 are taken as examples.

The other parameters in the fifth embodiment are given in the following table 9, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, and focal length in Table 9 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 9 was 587.6nm.

TABLE 9

In the fifth embodiment, table 10 gives the higher order term coefficients that can be used for each aspherical surface in the fifth embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.

Table 10

Referring to fig. 10 (a), fig. 10 (a) shows the optical spherical aberration diagrams of the optical lens 100 in the fifth embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 10 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 10 (a), the optical lens 100 in the fifth embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 10 (B), fig. 10 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587nm in the fifth 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. 10 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 10 (C), fig. 10 (C) is a graph of distortion of the optical lens 100 at a wavelength of 587nm in the fifth 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. As can be seen from (C) in fig. 10, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Referring to table 11, table 11 is a summary of the ratios of the relationships in the first embodiment to the fifth embodiment of the present application.

TABLE 11

Referring to fig. 11, the present application further discloses an image capturing module, where the image capturing module 200 includes a photosensitive chip 201 and the optical lens 100 according to any one of the first to fifth embodiments, and the photosensitive chip 201 is disposed on an image side of the optical lens 100. The optical lens 100 may be used to receive an optical signal of a subject and project the optical signal to the photo-sensing chip 201, and the photo-sensing chip 201 may be used to convert the optical signal corresponding to the subject into an image signal. And will not be described in detail here.

It can be appreciated that the image capturing module 200 with the optical lens 100 has all the technical effects of the optical lens 100, that is, the optical lens 100 has a larger f-number and a larger effective imaging radius by reasonably controlling the ratio of the f-number to the effective imaging radius of the optical lens, so that the optical lens 100 is miniaturized, the light incoming amount of the optical lens 100 is improved, the imaging definition of the optical lens 100 is improved, and particularly, the imaging effect of the optical lens 100 in a dim light environment can be enhanced, so that the optical lens 100 can be suitable for shooting in a dim light environment such as night scenes, rainy days, stars sky and the like, and the shooting requirement of customers on the dim light environment is met. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here. In some embodiments, the optical lens 100 further includes a prism 202, which may be a right angle prism, and the prism 202 is located between the object side of the optical lens 100 and the object side S1 of the first lens L1. The prism 202 includes an incident surface S21, a reflecting surface S22, and an exit surface S23, and the exit surface S23 is provided toward the image side surface S1 of the first lens L1. The light enters the prism 202 from the incident surface S21 of the prism 202, is reflected by the reflecting surface S22, and then exits from the exit surface S23 of the prism 202 to enter the first lens L1.

By adding the prism 202 between the object side of the optical lens 100 and the first lens L1, the total length of the optical lens can be reduced while the requirements of large effective focal length and small field angle are met, and further the miniaturized design of the optical lens is realized. Referring to fig. 12, the application further discloses an electronic device, where the electronic device 300 includes a housing 301 and the camera module 200 as described above, and the camera module 200 is disposed in the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, etc. It can be appreciated that the electronic device 300 having the image capturing module 200 also has all the technical effects of the optical lens 100. That is, the optical lens 100 of the electronic device 300 may have a larger f-number and a larger effective imaging radius while implementing a miniaturized design, so as to improve the imaging definition of the optical lens 100, and in particular, enhance the imaging effect of the optical lens 100 in a dark environment, so that the optical lens 100 may be suitable for shooting in a night scene, a rainy day, a sky, and other dark environments, so as to meet the shooting requirements of customers on the dark environment. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

The optical lens, the camera module, the electronic device and the automobile disclosed by the embodiment of the invention are described in detail, and specific examples are applied to explain the principle and the implementation mode of the invention, and the description of the above embodiments is only used for helping to understand the optical lens, the camera module, the electronic device and the automobile and the core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

1. An optical lens, characterized in that the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence from an object side to an image side along an optical axis;

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

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

the third lens element with refractive power;

the fourth lens element with refractive power has a convex image-side surface at a paraxial region;

The fifth lens element with refractive power;

the lens with the refractive power of the optical lens is the five lens;

the optical lens satisfies the following relation: 0.6/mm < FNO/ImgH <0.9/mm,4< | (R1-R2)/f 1| <16, and 26.75 deg.ltoreq.FOV.ltoreq.29.95 deg;

wherein FNO is the f-number of the optical lens, imgH is the radius of the effective imaging circle of the optical lens, R1 is the radius of curvature of the object side surface of the first lens at the optical axis, R2 is the radius of curvature of the image side surface of the first lens at the optical axis, f1 is the focal length of the first lens, and FOV is the maximum field angle of the optical lens.

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

0.3<ET1/CT1<0.8；

wherein ET1 is the distance from the maximum effective aperture of the object side surface of the first lens to the maximum effective aperture of the image side surface of the first lens in the optical axis direction, and CT1 is the thickness of the first lens on the optical axis.

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

0.8< Σet/Σct <1.2 and 0.8< ET3/CT3<2;

wherein Σet is the sum of distances from the maximum effective aperture of the object side surface of each lens in the optical lens to the maximum effective aperture of the image side surface in the optical axis direction, Σct is the sum of distances from the object side surface of each lens in the optical lens to the image side surface in the optical axis direction, ET3 is the distance from the maximum effective aperture of the object side surface of the third lens to the maximum effective aperture of the image side surface of the third lens in the optical axis direction, and CT3 is the thickness of the third lens on the optical axis.

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

2<f/f1<3；

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

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

-2<(R3+R4)/f2<-0.05；

wherein R3 is a radius of curvature of the object side surface of the second lens element at the optical axis, R4 is a radius of curvature of the image side surface of the second lens element at the optical axis, and f2 is a focal length of the second lens element.

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

0.5<ImgH*FNO/TTL<1.1；

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.

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

0<Alt-Agt<0.09mm；

wherein Alt is the longest distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element parallel to the optical axis direction, and Agt is the shortest distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element parallel to the optical axis direction.

8. An imaging module comprising a photosensitive chip and the optical lens according to any one of claims 1 to 7, wherein the photosensitive chip is disposed on an image side of the optical lens.

9. An electronic device, comprising a housing and the camera module of claim 8, wherein the camera module is disposed on the housing.