CN115166941B

CN115166941B - Optical lens, camera module and electronic equipment

Info

Publication number: CN115166941B
Application number: CN202210806529.7A
Authority: CN
Inventors: 谭怡翔; 党绪文
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2023-08-08
Anticipated expiration: 2042-07-08
Also published as: CN115166941A

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises the following components in sequence from an object side to an image side along an optical axis: the first lens element with negative refractive power has a convex object-side surface and a concave image-side surface at a paraxial region thereof, and has a concave object-side surface at a near-circumferential region thereof; the object side surface and the image side surface of the second lens element with positive refractive power are respectively convex and concave at the paraxial region; a third lens element with negative refractive power; the object side surface and the image side surface of the fourth lens element with positive refractive power are respectively convex and concave at the paraxial region; the object side surface and the image side surface of the fifth lens element with positive refractive power are respectively convex and concave at the paraxial region; the optical lens satisfies the relation: 0.9< f/EPD <1.3. The optical lens, the camera module and the electronic equipment provided by the invention have the characteristics of large aperture and miniaturization while ensuring 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 progress and development of society, people have increasingly high requirements on the imaging capability of electronic devices, and large aperture lenses can adapt to the shooting condition of dark light due to larger light quantity, so that the large aperture lenses are widely applied to the electronic devices, however, the optical lenses are required to realize the function of large apertures, and are generally large in size and cannot be compatible with the miniaturized design requirements of the electronic devices.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, which can ensure imaging quality and have the characteristics of large aperture and miniaturization.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens assembly comprising five lens elements with refractive power, in order from an object side to an image side along an optical axis:

a first lens element with negative refractive power having a convex object-side surface at a paraxial region, a concave image-side surface at a paraxial region, and a concave object-side surface at a near-circumferential region;

a second lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a third lens element with negative refractive power;

a fourth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

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

The optical lens satisfies the following relation:

0.9<f/EPD<1.3；

wherein f is the focal length of the optical lens, and EPD is the entrance pupil diameter of the optical lens.

The first lens element defining the optical lens has negative refractive power, and the object-side surface and the image-side surface of the first lens element are respectively provided with the convex surface and the concave surface at the paraxial region, so that incident light rays with larger angles can enter the optical lens element, the field angle range of the optical lens element is enlarged, and the incident light rays can be effectively converged, thereby being beneficial to controlling the size of the first lens element in the direction perpendicular to the optical axis, ensuring that the first lens element has smaller caliber and meeting the miniaturization design of the optical lens element; in addition, the concave surface of the object side surface of the first lens element is disposed at the near circumference, which is favorable for reducing the incident angle of the incident light beam with a large angle and reducing the risk of astigmatism generated at the object side end, so as to reduce the pressure of eliminating aberration of the image side lens elements (i.e., the second lens element and the fifth lens element); the object side surface and the image side surface of the second lens are respectively provided with the convex surface and the concave surface at the paraxial region by combining the second lens with negative refractive power, so that the surface types of the second lens and the first lens are more matched, the incident light is smoothly transited, the off-axis aberration is favorably corrected, the tolerance sensitivity of the optical lens is reduced, and meanwhile, the air gap between the front lens and the rear lens is reasonably configured, so that the risk of generating ghost images is reduced, and the imaging quality of the optical lens is improved; the third lens with negative refractive power is combined, so that the first lens to the third lens have negative and positive refractive power distribution, the spherical aberration and the coma aberration of the optical lens can be corrected, and the imaging quality of the optical lens is improved; the fourth lens element with positive refractive power has convex and concave object-side surfaces and image-side surfaces at paraxial regions, so that marginal view rays are effectively converged, deflection of marginal view rays is reduced, marginal view aberration generated by incident rays passing through the first lens element to the third lens element is corrected, spherical aberration and coma generated by light diffused through the third lens element are corrected, imaging quality of the optical lens element is improved, and total length of the optical lens element is shortened, so that miniaturization of the optical lens element is facilitated; the fifth lens element with positive refractive power has a convex object-side surface and a concave image-side surface at a paraxial region thereof, so that the fifth lens element is highly matched with the fourth lens element in surface form, the tolerance sensitivity of the optical lens element is reduced, aberration generated by the front lens element (the first lens element and the fourth lens element) and difficult to correct is further balanced, the aberration balance of the optical lens element is promoted, the imaging quality of the optical lens element is improved, and the concave image-side surface of the fifth lens element at the paraxial region thereof is provided, so that the imaging range of the optical lens element is ensured, and the outer diameter of the fifth lens element is prevented from being excessively large, thereby realizing miniaturization of the optical lens element.

In addition, the optical lens satisfies 0.9< f/EPD <1.3, the light entering quantity of the optical lens can be effectively increased by limiting the ratio of the focal length to the entrance pupil diameter of the optical lens, the relative illumination of the optical lens is improved, the optical lens has the characteristic of a large aperture, so that the optical lens can adapt to the shooting condition of dark light, the generation of dark angles is reduced, meanwhile, the size of Ai Liban can be reduced, the resolution of the optical lens is improved, and the imaging quality of the optical lens is improved, so that the design requirement of high pixels is met.

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

1.9< TTL/IMGH <2.2; and/or 0.11< BFL/TTL <0.17;

wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis (i.e. the total length of the optical lens), IMGH is the radius of the maximum effective imaging circle of the optical lens (i.e. the image height of the optical lens), and BFL is the minimum distance from the image side surface of the fifth lens to the imaging surface of the optical lens in a direction parallel to the optical axis (i.e. the back focal length of the optical lens).

The ratio of the total length to the image height of the optical lens is restrained, so that the total size of the optical lens can be effectively shortened, the optical lens can obtain a smaller size and has the characteristic of a large image surface, and the imaging quality of the optical lens is improved. When the ratio is lower than the lower limit, the total length of the optical lens is too small, the air gaps among the lenses are smaller, so that the sensitivity among the lenses is increased, the design and assembly of the lenses are not facilitated, meanwhile, the arrangement space of the optical lens is insufficient, the surface shape of the lens is excessively bent, high-order aberration is easy to generate, the aberration balance of the optical lens is not facilitated, and the imaging quality of the optical lens is further reduced; when the ratio is higher than the upper limit, the total length of the optical lens is too large, which is not beneficial to the miniaturization design of the optical lens.

In addition, the ratio of the back focal length to the total length of the optical lens is limited, so that the ratio of the back focal length to the total length of the optical lens can be reasonably configured, and the light rays can be gathered to the imaging surface with a sufficient distance, so that the optical lens can effectively control the incidence angle of the chief rays from the outermost view field to the imaging surface while the miniaturization is satisfied, the incidence angle of the chief rays on the imaging surface is reduced, the relative illuminance of the optical lens is improved, and the imaging quality of the optical lens is further improved.

-0.5< f2/f1<0, and-0.4 < f2/f3<0;

wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

By restricting the ratio of the focal length of the second lens to the focal length of the first lens and the ratio of the focal length of the second lens to the focal length of the third lens, the refractive powers of the first lens to the third lens can be kept at a certain gap, on one hand, smooth transition of incident light converged by the first lens to the rear lens group (namely, the fourth lens and the fifth lens) can be facilitated, and on the other hand, balancing of spherical aberration and coma of the rear lens group can be facilitated, so that the imaging quality of the optical lens can be improved. When the ratio is lower than the lower limit or higher than the upper limit, the aberration generated by the first lens to the third lens cannot be mutually and cooperatively eliminated, and meanwhile, incident light is too gathered or fails to be reasonably diffused, so that larger pressure is generated for controlling the light of the rear lens group, and the fourth lens and the fifth lens are too bent to influence the imaging quality of the optical lens.

0.8< CT2/CT3<1.9, and-0.4 < f2/f3<0;

wherein, CT2 is the thickness of the second lens on the optical axis (i.e. the center thickness of the second lens), CT3 is the thickness of the third lens on the optical axis (i.e. the center thickness of the third lens), f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

Through the ratio of the center thickness of the second lens and the center thickness of the third lens are reasonably controlled, the center thicknesses of the second lens and the center thickness of the third lens are enabled to be relatively close, so that light can be smoothly transited, chromatic aberration and spherical aberration of the optical lens can be corrected, and imaging quality of the optical lens is improved.

The refractive power of the second lens and the third lens can be reasonably configured by combining the control of the ratio of the focal length of the second lens and the focal length of the third lens, so that the deflection angle and the trend of light rays can be properly adjusted, and the imaging quality of the optical lens can be further improved.

1.9< Σct/Σat <5, and-0.4 < f2/f3<0;

wherein Σct is the sum of the thicknesses of the first lens to the fifth lens on the optical axis (i.e., the sum of the thicknesses of the centers of the lenses of the optical lens), Σat is the sum of the air gaps of the first lens to the fifth lens on the optical axis (i.e., the sum of the air gaps of the lenses of the optical lens), f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

The ratio of the sum of the center thicknesses of the lenses of the optical lens to the sum of the air gaps is restrained, so that the structural compactness of the optical lens can be improved, the miniaturization of the optical lens is facilitated, meanwhile, the air gaps between the lenses (the distance from the image side surface of the front lens to the object side surface of the rear lens) can be reasonably configured, on one hand, the uniform distribution of the lenses of the optical lens can be ensured, the smooth transition of light is facilitated, the aberration and the distortion of the optical lens are improved, the imaging quality of the optical lens is improved, on the other hand, the tolerance sensitivity of the optical lens can be reduced, the optical lens has good optical performance, and the imaging quality of the optical lens is further improved.

The refractive power of the second lens and the third lens can be reasonably configured by combining the control of the ratio of the focal length of the second lens and the focal length of the third lens, so that the higher-order aberration can be eliminated, and the imaging quality of the optical lens can be improved.

-5< f1/f34<0.5, and 1< ct3/CT4<3;

wherein f1 is a focal length of the first lens, f34 is a combined focal length of the third lens and the fourth lens, CT3 is a thickness of the third lens on the optical axis (i.e., a center thickness of the third lens), and CT4 is a thickness of the fourth lens on the optical axis (i.e., a center thickness of the fourth lens).

By restricting the ratio of the focal length of the first lens to the combined focal length of the third lens and the fourth lens, the first lens can be utilized to correct coma and curvature of field generated when light enters the fourth lens from the third lens, so as to improve the imaging quality of the optical lens.

The constraint on the ratio of the center thicknesses of the third lens and the fourth lens is combined, so that the overlarge gap between the center thicknesses of the third lens and the fourth lens can be avoided, smooth expansion of light rays in the third lens is facilitated, and enough travel is provided for correcting the propagation direction of the light rays in the fourth lens, so that the correction of chromatic aberration and spherical aberration of the optical lens is facilitated, and the imaging quality of the optical lens is improved.

0.5< SD11/IMGH <0.6, and 0<f/f5<1;

wherein SD11 is the maximum effective half-caliber of the object side surface of the first lens, IMGH is the radius of the maximum effective imaging circle of the optical lens (i.e. the image height of the optical lens), and f5 is the focal length of the fifth lens.

The ratio of the maximum effective half caliber of the object side surface of the first lens to the image height of the optical lens is restrained, so that the step difference between the lenses of the optical lens can be reduced, smooth transition of light rays among the lenses of the optical lens is facilitated, meanwhile, the light quantity of the optical lens can be increased, the relative illumination of the optical lens is improved, and the imaging quality of the optical lens is improved. When the ratio is lower than the lower limit or higher than the upper limit, the difficulty in controlling the incident light is increased, a longer structure is needed to realize smooth transition of the light, miniaturization of the optical lens is not facilitated, the relative illuminance of the optical lens cannot be ensured, and the imaging quality of the optical lens is reduced.

Meanwhile, the refractive power of the fifth lens can be reasonably configured by combining the control of the ratio of the focal length of the optical lens to the focal length of the fifth lens, so that the aberration problem caused by the large aperture characteristic can be favorably balanced, and the imaging quality of the optical lens can be further improved.

SAG42/SAG51<3, and 0<f/f5<1;

wherein SAG42 is a distance from a maximum effective aperture of an image side surface of the fourth lens element to a distance from an intersection point of the image side surface of the fourth lens element and the optical axis in a direction parallel to the optical axis (i.e., a sagittal height of a maximum effective half aperture of the image side surface of the fourth lens element), SAG51 is a distance from a maximum effective aperture of an object side surface of the fifth lens element to a distance from an intersection point of the object side surface of the fifth lens element and the optical axis in a direction parallel to the optical axis (i.e., a sagittal height of a maximum effective half aperture of the object side surface of the fifth lens element), and f5 is a focal length of the fifth lens element.

The curvature degree of the image side surface of the fourth lens and the object side surface of the fifth lens can be effectively controlled by restraining the sagittal ratio of the maximum effective half caliber of the image side surface of the fourth lens and the object side surface of the fifth lens, so that the image side surface of the fourth lens is more matched with the object side surface of the fifth lens, the deflection angle of light rays is reduced, the generation of off-axis chromatic aberration is reduced, and meanwhile, the light passing quantity of the fourth lens and the fifth lens can be improved, so that the relative illumination of the optical lens is improved, and the imaging quality of the optical lens is improved.

56deg<FOV/FNO<90deg；

wherein, FOV is the angle of view of the optical lens, FNO is the f-number of the optical lens;

the ratio of the field angle to the f-number of the optical lens is restrained, so that the field angle of the optical lens can be restrained while the large aperture characteristic of the optical lens is ensured, the incident angle of light is reasonably controlled, smooth transition of the light is facilitated, and the imaging quality of the optical lens is improved. When the ratio is lower than the lower limit, the field angle of the optical lens is too small, so that the field range of the optical lens is reduced, the acquisition of the object space by the optical lens is not facilitated, or the aperture of the optical lens is too small, the light passing quantity of the optical lens is insufficient, so that the optical lens generates a dark angle, and the imaging quality of the optical lens is reduced; when the ratio is higher than the upper limit, the angle of view of the optical lens is too large, so that the aperture of the optical lens is too large, the control of light entering the optical lens is not facilitated, aberration and distortion which are difficult to correct are easily generated, and the imaging quality of the optical lens is reduced.

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 has the characteristics of large aperture and miniaturization while ensuring imaging quality.

In a third aspect, the invention discloses an electronic device, which comprises a housing and the camera module set in the second aspect, wherein the camera module set is arranged on the housing. The electronic equipment with the camera module has the characteristics of large aperture and miniaturization while ensuring imaging quality.

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

according to the optical lens, the camera module and the electronic equipment, the first lens of the optical lens has negative refractive power, and the object side surface and the image side surface of the first lens are respectively provided with the convex surface and the concave surface at the paraxial region, so that incident light rays with larger angles can enter the optical lens, the field angle range of the optical lens is enlarged, and meanwhile, the incident light rays can be effectively converged, thereby being beneficial to controlling the size of the first lens in the direction perpendicular to the optical axis, ensuring that the first lens has smaller caliber and meeting the miniaturization design of the optical lens; in addition, the concave surface of the object side surface of the first lens element is disposed at the near circumference, which is favorable for reducing the incident angle of the incident light beam with a large angle and reducing the risk of astigmatism generated at the object side end, so as to reduce the pressure of eliminating aberration of the image side lens elements (i.e., the second lens element and the fifth lens element); the object side surface and the image side surface of the second lens are respectively provided with the convex surface and the concave surface at the paraxial region by combining the second lens with negative refractive power, so that the surface types of the second lens and the first lens are more matched, the incident light is smoothly transited, the off-axis aberration is favorably corrected, the tolerance sensitivity of the optical lens is reduced, and meanwhile, the air gap between the front lens and the rear lens is reasonably configured, so that the risk of generating ghost images is reduced, and the imaging quality of the optical lens is improved; the third lens with negative refractive power is combined, so that the first lens to the third lens have negative and positive refractive power distribution, the spherical aberration and the coma aberration of the optical lens can be corrected, and the imaging quality of the optical lens is improved; the fourth lens element with positive refractive power has convex and concave object-side surfaces and image-side surfaces at paraxial regions, so that marginal view rays are effectively converged, deflection of marginal view rays is reduced, marginal view aberration generated by incident rays passing through the first lens element to the third lens element is corrected, spherical aberration and coma generated by light diffused through the third lens element are corrected, imaging quality of the optical lens element is improved, and total length of the optical lens element is shortened, so that miniaturization of the optical lens element is facilitated; the fifth lens element with positive refractive power has a convex object-side surface and a concave image-side surface at a paraxial region thereof, so that the fifth lens element is highly matched with the fourth lens element in surface form, the tolerance sensitivity of the optical lens element is reduced, aberration generated by the front lens element (the first lens element and the fourth lens element) and difficult to correct is further balanced, the aberration balance of the optical lens element is promoted, the imaging quality of the optical lens element is improved, and the concave image-side surface of the fifth lens element at the paraxial region thereof is provided, so that the imaging range of the optical lens element is ensured, and the outer diameter of the fifth lens element is prevented from being excessively large, thereby realizing miniaturization of the optical lens element.

Drawings

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

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

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

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

Fig. 4 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in the 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 longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a 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 longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a 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 longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve 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

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

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

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

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

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

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

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, wherein the optical lens 100 has five lens elements with refractive power, and the lens elements include a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4 and a fifth lens element L5, which are sequentially disposed from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence from the object side of the first lens L1, and finally is imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 with negative refractive power, the second lens element L2 with positive 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 positive refractive power.

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

By reasonably arranging the surface shape and refractive power of each lens element between the first lens element L1 and the fifth lens element L5, the optical lens 100 can be made to have a large aperture and a small size while ensuring imaging quality.

Further, in some embodiments, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all plastic, and the optical lens 100 can reduce the weight and the cost. In other embodiments, 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 glass, so that the optical lens 100 has a good optical effect, and the temperature drift sensitivity of the optical lens 100 can be reduced.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be aspheric lenses for ease of processing and molding. It is understood that in other embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may also be spherical lenses.

In some embodiments, the optical lens 100 further includes a stop STO, which may be an aperture stop and/or a field stop, for example, the stop STO may be an aperture stop, or the stop STO may be a field stop, or the stop STO may be an aperture stop and a field stop. By providing the stop STO on the object side of the first lens L1, the exit pupil can be moved away from the imaging plane 101, and the effective diameter of the optical lens 100 can be reduced without reducing the telecentricity of the optical lens 100, thereby achieving miniaturization. It will be appreciated that in other embodiments, the stop STO may be disposed between other lenses, and the arrangement is adjusted according to the actual situation, which is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 further includes an infrared band-pass filter 60, and the infrared band-pass filter 60 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100. The infrared band-pass filter 60 is selected to transmit infrared light and reflect visible light, so that infrared imaging of the optical lens 100 is realized, and the optical lens 100 can be suitable for dim light shooting environments such as rainy days, night, and the like.

It is to be understood that the infrared band-pass filter 60 may be made of an optical glass coating, or may be made of colored glass, or the infrared band-pass filter 60 made of other materials may be selected according to actual needs, and is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship:

0.9<f/EPD<1.3；

where f is the focal length of the optical lens 100 and EPD is the entrance pupil diameter of the optical lens 100.

By defining that the first lens element L1 of the optical lens 100 has negative refractive power, and combining the arrangement that the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, respectively, the incident light rays with a larger angle can enter the optical lens element 100, the field angle range of the optical lens element 100 is enlarged, and the incident light rays can be effectively converged, thereby being beneficial to controlling the size of the first lens element L1 in the direction perpendicular to the optical axis O, ensuring that the first lens element L1 has a smaller caliber so as to meet the miniaturization design of the optical lens element 100; in addition, the concave surface of the object side surface 11 of the first lens element L1 at the near circumference is beneficial to reducing the incident angle of the incident light beam with a large angle and reducing the risk of astigmatism generated at the object side end, so as to reduce the pressure of eliminating the aberration of the image side lens elements (i.e., the second lens element L2-the fifth lens element L5); in combination with the second lens element L2 with negative refractive power, 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, so that the surface shapes of the second lens element L2 and the first lens element L1 are more matched, the incident light is smoothly transitioned, the off-axis aberration is favorably corrected, the tolerance sensitivity of the optical lens 100 is reduced, and meanwhile, the air gap between the front lens element and the rear lens element is reasonably configured to reduce the risk of ghost images, thereby improving the imaging quality of the optical lens 100; by combining the third lens element L3 with negative refractive power, the first lens element L1 to the third lens element L3 can have negative and positive refractive power distribution, which is beneficial to correcting spherical aberration and coma aberration of the optical lens 100 and improving imaging quality of the optical lens 100; the fourth lens element L4 with positive refractive power has a convex object-side surface 41 and a concave image-side surface 42 at a paraxial region O, which are combined with each other, so that the marginal field light is effectively converged, the deflection of the marginal field light is reduced, the marginal field aberration generated when the incident light passes through the first lens element L1 to the third lens element L3 is corrected, and the spherical aberration and the coma aberration generated when the light is diffused by the third lens element L3 are corrected, thereby improving the imaging quality of the optical lens 100, and shortening the total length of the optical lens 100, thereby facilitating the miniaturization of the optical lens 100; the fifth lens element L5 with positive refractive power has a convex object-side surface 51 and a concave image-side surface 52 at a paraxial region O, such that the fifth lens element L5 is highly matched with the fourth lens element L4, thereby reducing tolerance sensitivity of the optical lens element 100, balancing aberration generated by the front lens element (the first lens element L1-the fourth lens element L4) and improving aberration balance of the optical lens element 100, and improving imaging quality of the optical lens element 100, and the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region O, thereby ensuring an imaging range of the optical lens element 100 while avoiding an excessive outer diameter of the fifth lens element L5, and further reducing the size of the optical lens element 100.

In addition, the optical lens 100 satisfies 0.9< f/EPD <1.3, and by limiting the ratio of the focal length to the entrance pupil diameter of the optical lens 100, the light entering amount of the optical lens 100 can be effectively increased, the relative illuminance of the optical lens 100 is improved, so that the optical lens 100 has the characteristic of a large aperture, the optical lens 100 can adapt to the photographing condition of dark light, the generation of a dark angle is reduced, and meanwhile, the size of Ai Liban can be reduced, the resolution of the optical lens 100 is improved, and the imaging quality of the optical lens 100 is improved, so that the design requirement of high pixels is satisfied.

In some embodiments, the optical lens 100 satisfies the following relationship:

1.9< TTL/IMGH <2.2; and/or 0.11< BFL/TTL <0.17;

where TTL is the distance from the object side surface 11 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis O (i.e., the total length of the optical lens 100), IMGH is the radius of the maximum effective imaging circle of the optical lens 100 (i.e., the image height of the optical lens 100), and BFL is the minimum distance from the image side surface 52 of the fifth lens L5 to the imaging surface 101 of the optical lens 100 in the direction parallel to the optical axis O (i.e., the back focal length of the optical lens 100).

By restricting the ratio of the total length to the image height of the optical lens 100, the total size of the optical lens 100 can be effectively shortened, so that the optical lens 100 can obtain a smaller size and simultaneously has the characteristic of a large image plane, thereby being beneficial to improving the imaging quality of the optical lens 100. When the ratio is lower than the lower limit, the total length of the optical lens 100 is too small, and the air gaps among the lenses are smaller, so that the sensitivity among the lenses is increased, the design and assembly of the lenses are not facilitated, meanwhile, the arrangement space of the optical lens 100 is insufficient, the surface shape of the lenses is excessively curved, high-order aberration is easy to generate, the aberration balance of the optical lens 100 is not facilitated, and the imaging quality of the optical lens 100 is further reduced; when the ratio is higher than the upper limit, the total length of the optical lens 100 is excessively large, which is disadvantageous for the miniaturization design of the optical lens 100.

In addition, by limiting the ratio of the back focal length to the total length of the optical lens 100, the ratio of the back focal length to the total length of the optical lens 100 can be reasonably configured, so that the light rays have a sufficient distance to be converged to the imaging surface 101, and the optical lens 100 can effectively control the incidence angle of the chief ray from the outermost view field to the imaging surface 101 while meeting miniaturization requirements, so as to reduce the incidence angle of the chief ray from the imaging surface 101, improve the relative illuminance of the optical lens 100, and further improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

-0.5< f2/f1<0, and-0.4 < f2/f3<0;

wherein f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, and f3 is the focal length of the third lens L3.

By restricting the ratio of the focal lengths of the second lens L2 and the first lens L1 and the ratio of the focal lengths of the second lens L2 and the third lens L3, the refractive powers of the first lens L1 to the third lens L3 can be kept at a certain gap, which is beneficial to smoothly transition incident light converged by the first lens L1 to the rear lens group (i.e., the fourth lens L4 and the fifth lens L5), and is beneficial to balance spherical aberration and coma aberration of the rear lens group to improve the imaging quality of the optical lens 100. When the ratio is lower than the lower limit or higher than the upper limit, aberrations generated by the first lens element L1 to the third lens element L3 cannot be cooperatively eliminated, and meanwhile, incident light is too gathered or fails to reasonably diffuse, so that a larger pressure is generated for controlling light of the rear lens assembly, and the fourth lens element L4 and the fifth lens element L5 are too curved to affect the imaging quality of the optical lens assembly 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

0.8< CT2/CT3<1.9, and-0.4 < f2/f3<0;

wherein, CT2 is the thickness of the second lens L2 on the optical axis O (i.e., the center thickness of the second lens L2), CT3 is the thickness of the third lens L3 on the optical axis O (i.e., the center thickness of the third lens L3), f2 is the focal length of the second lens L2, and f3 is the focal length of the third lens L3.

Through the ratio of the center thicknesses of the second lens L2 and the third lens L3, the center thicknesses of the second lens L2 and the third lens L3 can be relatively close, so that light can be smoothly transited, chromatic aberration and spherical aberration of the optical lens 100 can be corrected, and imaging quality of the optical lens 100 can be improved.

In combination with the control of the ratio of the focal lengths of the second lens element L2 and the third lens element L3, the refractive powers of the second lens element L2 and the third lens element L3 can be reasonably configured to appropriately adjust the deflection angle and the progression of the light beam, thereby further improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

1.9< Σct/Σat <5, and-0.4 < f2/f3<0;

wherein Σct is the sum of the thicknesses of the first lens L1 to the fifth lens L5 on the optical axis O (i.e., the sum of the thicknesses of the centers of the lenses of the optical lens 100), Σat is the sum of the air gaps of the first lens L1 to the fifth lens L5 on the optical axis O (i.e., the sum of the air gaps of the lenses of the optical lens 100), f2 is the focal length of the second lens L2, and f3 is the focal length of the third lens L3.

By restricting the ratio of the sum of the center thicknesses of the lenses of the optical lens 100 to the sum of the air gaps, the structural compactness of the optical lens 100 can be improved, the miniaturization of the optical lens 100 is facilitated, and meanwhile, the air gaps (the distance from the image side surface of the previous lens to the object side surface of the next lens) between the lenses can be reasonably configured, so that on one hand, the uniform distribution of the lenses of the optical lens 100 can be ensured, the smooth transition of light is facilitated, the aberration and the distortion of the optical lens 100 are improved, the imaging quality of the optical lens 100 is improved, and on the other hand, the tolerance sensitivity of the optical lens 100 can be reduced, the optical lens 100 has good optical performance, and the imaging quality of the optical lens 100 is further improved.

By combining the control of the ratio of the focal lengths of the second lens element L2 and the third lens element L3, the refractive powers of the second lens element L2 and the third lens element L3 can be reasonably configured, which is beneficial to eliminating higher-order aberrations and improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

-5< f1/f34<0.5, and 1< ct3/CT4<3;

wherein f1 is a focal length of the first lens element L1, f34 is a combined focal length of the third lens element L3 and the fourth lens element L4, CT3 is a thickness of the third lens element L3 on the optical axis O (i.e., a center thickness of the third lens element L3), and CT4 is a thickness of the fourth lens element L4 on the optical axis O (i.e., a center thickness of the fourth lens element L4).

By restricting the ratio of the focal length of the first lens L1 to the combined focal length of the third lens L3 and the fourth lens L4, the first lens L1 can be used to correct coma and curvature of field generated when light enters the fourth lens L4 from the third lens L3, so as to improve the imaging quality of the optical lens 100.

In combination with the constraint on the ratio of the central thicknesses of the third lens L3 and the fourth lens L4, the excessive difference between the central thicknesses of the third lens L3 and the fourth lens L4 can be avoided, which is favorable for the smooth expansion of light in the third lens L3 and the enough travel of the light in the fourth lens L4 for correcting the propagation direction, so as to be favorable for the correction of chromatic aberration and spherical aberration of the optical lens 100, thereby being favorable for improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

0.5< SD11/IMGH <0.6, and 0<f/f5<1;

where SD11 is the maximum effective half-caliber of the object side surface 11 of the first lens L1, IMGH is the radius of the maximum effective imaging circle of the optical lens 100 (i.e. the image height of the optical lens 100), and f5 is the focal length of the fifth lens L5.

By restricting the ratio of the maximum effective half-caliber of the object side surface 11 of the first lens L1 to the image height of the optical lens 100, the step difference between the lenses of the optical lens 100 can be reduced, which is beneficial to smoothly transition light rays among the lenses of the optical lens 100, and meanwhile, the light flux of the optical lens 100 can be increased, and the relative illuminance of the optical lens 100 can be improved, so that the imaging quality of the optical lens 100 can be improved. When the ratio is lower than the lower limit or higher than the upper limit, the difficulty in controlling the incident light is increased, a longer structure is required to achieve smooth transition of the light, which is disadvantageous for miniaturization of the optical lens 100, and the relative illuminance of the optical lens 100 cannot be ensured, resulting in degradation of the imaging quality of the optical lens 100.

Meanwhile, in combination with the control of the ratio of the focal length of the optical lens 100 to the focal length of the fifth lens L5, the refractive power of the fifth lens L5 can be reasonably configured, which is beneficial to balancing the aberration problem caused by the large aperture characteristic, so as to further improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

SAG42/SAG51<3, and 0<f/f5<1;

wherein SAG42 is a distance from a maximum effective aperture of the image side surface 42 of the fourth lens element L4 to a sagittal height of an intersection point of the image side surface 42 of the fourth lens element L4 and the optical axis O in a direction parallel to the optical axis O (i.e., a sagittal height of the maximum effective half aperture of the image side surface 42 of the fourth lens element L4), SAG51 is a distance from a maximum effective aperture of the object side surface 51 of the fifth lens element L5 to a distance from an intersection point of the object side surface 51 of the fifth lens element L5 and the optical axis O in a direction parallel to the optical axis O (i.e., a sagittal height of the maximum effective half aperture of the object side surface 51 of the fifth lens element L5), and f5 is a focal length of the fifth lens element L5.

By restricting the sagittal ratio of the image side surface 42 of the fourth lens element L4 to the object side surface 51 of the fifth lens element L5 at the maximum effective half-caliber, the curvature of the image side surface 42 of the fourth lens element L4 and the object side surface 51 of the fifth lens element L5 can be effectively controlled, so that the image side surface 42 of the fourth lens element L4 and the object side surface 51 of the fifth lens element L5 are more matched, the deflection angle of light is reduced, the off-axis chromatic aberration is reduced, and the light passing amount of the fourth lens element L4 and the fifth lens element L5 can be improved, thereby improving the relative illuminance of the optical lens 100 and improving the imaging quality of the optical lens 100.

Meanwhile, in combination with the constraint of the ratio of the focal length of the optical lens 100 to the focal length of the fifth lens L5, the refractive power of the fifth lens L5 can be reasonably configured, which is beneficial to balancing the aberration problem caused by the large aperture characteristic, so as to further improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

56deg<FOV/FNO<90deg；

wherein, FOV is the field angle of the optical lens 100, and FNO is the f-number of the optical lens 100;

by restricting the ratio of the field angle to the f-number of the optical lens 100, the field angle of the optical lens 100 can be restricted while ensuring the large aperture characteristic of the optical lens 100, so as to reasonably control the incident angle of light, thereby being beneficial to realizing smooth transition of light and improving the imaging quality of the optical lens 100. When the ratio is lower than the lower limit, the field angle of the optical lens 100 is too small, which results in a decrease in the field of view of the optical lens 100, which is not conducive to the acquisition of the object space by the optical lens 100, or the aperture of the optical lens 100 is too small, and the light flux of the optical lens 100 is insufficient, so that the optical lens 100 generates a dark angle, which results in a decrease in the imaging quality of the optical lens 100; when the ratio is higher than the upper limit, the angle of view of the optical lens 100 is too large, so that the aperture of the optical lens 100 is too large, which is unfavorable for controlling the light entering the optical lens 100, and aberrations and distortions difficult to correct are easily generated, thereby reducing the imaging quality of the optical lens 100.

The object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangential to the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, c=1/Y, Y is the radius of curvature (i.e., paraxial curvature c is the inverse of the radius Y in table 1), k is the conic constant, ai is the coefficient corresponding to the i-th term in the aspheric surface type formula.

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 according to the first embodiment of the present application includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared band-pass filter 60 sequentially disposed 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 can be referred to in the above embodiments, and will not be described herein.

Further, the first lens element L1 with negative refractive power, the second lens element L2 with positive 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 positive refractive power.

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

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

Specifically, taking the effective focal length f=2.04 mm of the optical lens 100, the f-number fno=1.07 of the optical lens 100, the field angle fov= 81.01deg of the optical lens 100, the total length ttl=3.62 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side 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 2 and 3 correspond to the object side surface and the image side surface of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis O. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The value of the stop STO in the "thickness" parameter row is the distance between the stop STO 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 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. It will be appreciated that the units of Y radius, thickness, and focal length in Table 1 are all mm, and that the refractive index, abbe number in Table 1 is obtained at reference wavelength 587nm, and the focal length is obtained at reference wavelength 920 nm.

K in table 2 is a conic constant, and the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in the first embodiment are given in table 2.

TABLE 1

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TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration diagram of the optical lens 100 in the first embodiment at a wavelength of 587 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift in mm, and the ordinate in 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 an astigmatic 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. As can be seen from fig. 2 (B), at this wavelength, the astigmatism of the optical lens 100 is well compensated for, and T in the astigmatism curve represents the curvature of the imaging surface 101 in the meridian direction and S represents the curvature of the imaging surface 101 in the sagittal direction.

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 distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 2 (C), at this wavelength, the distortion of the optical lens 100 becomes well corrected.

Second embodiment

As shown in fig. 3, the optical lens 100 according to the second embodiment of the present application includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared band-pass filter 60 sequentially disposed 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 can be referred to in the above embodiments, and will not be described herein.

Specifically, taking the effective focal length f=2.35 mm of the optical lens 100, the f-number fno=1.03 of the optical lens 100, the field angle fov=79.06 deg of the optical lens 100, the total length ttl=4.19 mm of the optical lens 100 as an example.

Other parameters in this second embodiment are given in table 3 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It will be appreciated that the units of Y radius, thickness, and focal length in Table 3 are all mm, and that the refractive index, abbe number in Table 3 is obtained at reference wavelength 587nm, and the focal length is obtained at reference wavelength 920 nm.

K in table 4 is a conic constant, and the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in the second embodiment are given in table 4.

TABLE 3 Table 3

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TABLE 4 Table 4

Referring to fig. 4, as can be seen from the (a) longitudinal spherical aberration diagram in fig. 4, the (B) astigmatic curve diagram in fig. 4, and the (C) distortion diagram in fig. 4, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in fig. 4 (a), 4 (B) and 4 (C) may refer to the contents described in the first embodiment in fig. 2 (a), 2 (B) and 2 (C), and will not be repeated here.

Third embodiment

As shown in fig. 5, the optical lens 100 according to the third embodiment of the present application includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared band-pass filter 60 sequentially disposed 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 can be referred to in the above embodiments, and will not be described herein.

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

Specifically, taking the effective focal length f=2.49 mm of the optical lens 100, the f-number fno=1.09 of the optical lens 100, the field angle fov= 76.06deg of the optical lens 100, the total length ttl=4.39 mm of the optical lens 100 as an example.

Other parameters in this third embodiment are given in table 5 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It will be appreciated that the units of Y radius, thickness, and focal length in Table 5 are all mm, and that the refractive index, abbe number in Table 5 is obtained at reference wavelength 587nm, and the focal length is obtained at reference wavelength 920 nm.

K in Table 6 is a conic constant, and the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirror surfaces in the third embodiment are shown in Table 6.

TABLE 5

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TABLE 6

Referring to fig. 6, as can be seen from the (a) longitudinal spherical aberration diagram in fig. 6, the (B) astigmatic curve diagram in fig. 6, and the (C) distortion diagram in fig. 6, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 (a), 6 (B) and 6 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Fourth embodiment

As shown in fig. 7, the optical lens 100 according to the fourth embodiment of the present application includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared band-pass filter 60 sequentially disposed 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 can be referred to in the above embodiments, and will not be described herein.

Specifically, taking the effective focal length f=1.85 mm of the optical lens 100, the f-number fno=0.97 of the optical lens 100, the field angle fov=86.35 deg of the optical lens 100, the total length ttl=3.58 mm of the optical lens 100 as an example.

Other parameters in this fourth embodiment are given in table 7 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It will be appreciated that the units of Y radius, thickness, and focal length in Table 7 are all mm, and that the refractive index, abbe number in Table 7 is obtained at reference wavelength 587nm, and that the focal length is obtained at reference wavelength 920 nm.

K in table 8 is a conic constant, and the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 usable for each aspherical mirror surface in the fourth embodiment are given in table 8.

TABLE 7

TABLE 8

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Referring to fig. 8, as can be seen from the (a) longitudinal spherical aberration diagram in fig. 8, the (B) astigmatic curve diagram in fig. 8, and the (C) distortion diagram in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 8 (a), 8 (B) and 8 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Fifth embodiment

As shown in fig. 9, the optical lens 100 according to the fifth embodiment of the present application includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared band-pass filter 60 sequentially disposed 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 can be referred to in the above embodiments, and will not be described herein.

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

Specifically, taking the effective focal length f=3.65 mm of the optical lens 100, the f-number fno=1.28 of the optical lens 100, the field angle fov=71.14 deg of the optical lens 100, and the total length ttl=5.85 mm of the optical lens 100 as an example.

Other parameters in this fifth embodiment are given in table 9 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It will be appreciated that the units of Y radius, thickness, and focal length in Table 9 are all mm, and that the refractive index, abbe number in Table 9 is obtained at reference wavelength 587nm, and the focal length is obtained at reference wavelength 920 nm.

K in table 10 is a conic constant, and the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 usable for each aspherical mirror surface in the fifth embodiment are shown in table 10.

TABLE 9

Table 10

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Referring to fig. 10, as can be seen from the (a) longitudinal spherical aberration diagram in fig. 10, the (B) astigmatic curve diagram in fig. 10, and the (C) distortion diagram in fig. 10, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 (a), 10 (B) and 10 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

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

Relation/embodiment	First implementation	Second embodiment	Third embodiment	Fourth embodiment	Fifth implementation
						0.9<f/EPD<1.3	1.062	1.027	1.088	0.964	1.267
1.9<TTL/IMGH<2.2	2.009	2.096	2.197	1.986	2.167
						0.11<BFL/TTL<0.17	0.166	0.143	0.137	0.165	0.120
-0.5<f2/f1<0	-0.388	-0.315	-0.040	-0.492	-0.406
						-0.4<f2/f3<0	-0.327	-0.077	-0.293	-0.360	-0.292
0.8<CT2/CT3<1.9	1.002	0.856	1.821	1.271	1.026
						1.9<∑CT/∑AT<5	3.096	3.388	1.997	4.297	2.762
-5<f1/f34<0.5	-0.001	-1.217	-4.885	0.431	-0.650
						1<CT3/CT4<3	1.663	2.606	1.337	1.332	1.086
0.5<SD11/IMGH<0.6	0.533	0.571	0.572	0.533	0.533
						0<f/f5<1	0.549	0.159	0.450	0.946	0.018
SAG42/SAG51<3	-1517.555	2.685	1.234	-131.202	-1.748
						56deg<FOV/FNO<90deg	75.710deg	76.757deg	69.780deg	89.021deg	57.922deg

Referring to fig. 11, the present application further discloses an image capturing module 200, which includes an image sensor 201 and the optical lens 100 according to any one of the first to fifth embodiments, wherein the image sensor 201 is disposed on an image side of the optical lens 100. The optical lens 100 is configured to receive an optical signal of a subject and project the optical signal to the image sensor 201, and the image sensor 201 is configured to convert the optical signal corresponding to the subject into an image signal, which is not described herein. It can be appreciated that the image capturing module 200 having the optical lens 100 described above has the characteristics of large aperture and miniaturization while ensuring imaging quality. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

Referring to fig. 12, the present application further discloses an electronic device 300, where the electronic device 300 includes a housing 301 and the above-mentioned camera module 200, and the camera module 200 is disposed in the housing 301. 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, a vehicle recorder, a back image, 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 described above. That is, the imaging quality is ensured, and the imaging device has the characteristics of large aperture and miniaturization. Since the above technical effects are described in detail in the embodiments of the optical lens, they will not be described in detail herein.

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

Claims

1. An optical lens element, comprising five lens elements with refractive power, in order from an object side to an image side along an optical axis:

a third lens element with negative refractive power;

the optical lens satisfies the following relation:

0.9<f/EPD<1.3；

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

1.9< TTL/IMGH <2.2; and/or 0.11< BFL/TTL <0.17;

wherein TTL is a distance from an object side surface of the first lens element to an imaging surface of the optical lens element on the optical axis, IMGH is a radius of a maximum effective imaging circle of the optical lens element, and BFL is a minimum distance from an image side surface of the fifth lens element to the imaging surface of the optical lens element in a direction parallel to the optical axis.

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

-0.5< f2/f1<0, and-0.4 < f2/f3<0;

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

0.8< CT2/CT3<1.9, and-0.4 < f2/f3<0;

wherein CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

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

1.9< Σct/Σat <5, and-0.4 < f2/f3<0;

Wherein Σct is the sum of the thicknesses of the first lens to the fifth lens on the optical axis, Σat is the sum of the air gaps of the first lens to the fifth lens on the optical axis, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

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

-5< f1/f34<0.5, and 1< ct3/CT4<3;

wherein f1 is a focal length of the first lens, f34 is a combined focal length of the third lens and the fourth lens, CT3 is a thickness of the third lens on the optical axis, and CT4 is a thickness of the fourth lens on the optical axis.

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

0.5< SD11/IMGH <0.6, and 0<f/f5<1;

wherein SD11 is the maximum effective half-caliber of the object side surface of the first lens, IMGH is the radius of the maximum effective imaging circle of the optical lens, and f5 is the focal length of the fifth lens.

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

SAG42/SAG51<3, and 0<f/f5<1;

Wherein SAG42 is a distance from a maximum effective caliber of an image side surface of the fourth lens element to an intersection point of the image side surface of the fourth lens element and the optical axis in a direction parallel to the optical axis, SAG51 is a distance from a maximum effective caliber of an object side surface of the fifth lens element to an intersection point of the object side surface of the fifth lens element and the optical axis in a direction parallel to the optical axis, and f5 is a focal length of the fifth lens element.

9. A camera module, its characterized in that: the camera module comprises an image sensor and the optical lens as claimed in any one of claims 1 to 8, wherein the image sensor is arranged on the image side of the optical lens.

10. An electronic device, characterized in that: the electronic device comprises a shell and the camera module set according to claim 9, wherein the camera module set is arranged on the shell.