CN116027527B

CN116027527B - Optical lens, camera module and electronic equipment

Info

Publication number: CN116027527B
Application number: CN202310321042.4A
Authority: CN
Inventors: 徐标; 李翔宇; 王国贵
Original assignee: Jiangxi Oufei Optics Co ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-08-08
Anticipated expiration: 2043-03-29
Also published as: CN116027527A

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens has five lenses with refractive power, and the lens sequentially comprises the following components 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 and a concave image-side surface at a paraxial region; the object side surface and the image side surface of the second lens element with refractive power are respectively convex and concave at the paraxial region; a third lens element with refractive power; the fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface at a paraxial region; a fifth lens element with negative refractive power having a concave image-side surface at a paraxial region; the optical lens satisfies the relation: 1.8 < TTL/IMGH < 2.0. By adopting the optical lens, the camera module and the electronic equipment, the imaging quality can be ensured, and the miniaturized design requirement can be met.

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 technology, people have higher requirements on the imaging capability of electronic devices, and with the popularization of mobile electronic devices, portability has become a mainstream development trend of electronic devices, so that the electronic devices have to meet miniaturization design while ensuring the imaging capability. This requires that the optical lens must be designed to be compact while satisfying imaging quality, thereby saving space for other components.

Therefore, how to configure parameters such as the number of lenses and the surface shape of the optical lens, so that the lens can simultaneously achieve the characteristics of miniaturization and high imaging quality, becomes a problem to be solved in the present day.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the design requirement of miniaturization while ensuring imaging quality.

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

a second lens element with 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 refractive power;

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

a fifth lens element with negative refractive power having a concave image-side surface at a paraxial region;

The optical lens satisfies the following relation:

1.8＜TTL/IMGH＜2.0；

wherein 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 (i.e. the total length of the optical lens), and IMGH is the radius of the maximum effective imaging circle of the optical lens (i.e. the half image height of the optical lens).

The first lens of the optical lens is provided with positive refractive power, and the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface at a paraxial region, so that incident light rays with a large angle enter the optical lens, the field angle range of the optical lens is enlarged, the characteristic of a large field angle is obtained, and meanwhile, the incident light rays can be effectively converged, thereby being beneficial to controlling the size of the first lens in the direction vertical to the optical axis, and meeting the miniaturization design of the optical lens; the second lens and the third lens provide positive refractive power or negative refractive power for the optical lens, so that aberration balance of the optical lens can be effectively promoted, and therefore, the resolution of the optical lens is improved, meanwhile, the arrangement that the object side surface and the image side surface of the second lens are respectively convex and concave at a paraxial region is matched, so that incident light rays passing through the first lens can enter the optical lens more gently, the correction of curvature of field and coma of the optical lens is facilitated, the resolution change sensitivity of the optical lens is reduced, the imaging effect stability of the optical lens is enhanced, and the imaging quality of the optical lens is improved; the fourth lens element with positive refractive power has concave and convex object-side surfaces and image-side surfaces at paraxial regions, which facilitates converging incident light rays, reduces deflection angle of the light rays, effectively corrects spherical aberration of the optical lens element, and improves imaging quality of the optical lens element; the fifth lens element with negative refractive power is used to balance the aberration generated by the first lens element to the fourth lens element, thereby improving the aberration balance of the optical lens element and the resolution of the optical lens element, and further improving the imaging quality of the optical lens element.

In addition, the optical lens satisfies 1.8 < TTL/IMGH < 2.0, and the ratio of the total length and half image height of the optical lens is restrained, so that the optical lens has the characteristic of large image surface while meeting miniaturization, and the optical lens can be matched with an image sensor with larger size, thereby improving the imaging quality of the optical lens.

As an alternative embodiment, in the embodiment of the first aspect of the present invention, the object-side surface 11 of the first lens element is convex at the paraxial region O, and the image-side surface 12 of the first lens element is concave at the paraxial region O; the object-side surface 21 of the second lens element is convex at a paraxial region O, and the image-side surface 22 of the second lens element is concave at the paraxial region O; the object-side surface 31 of the third lens element is concave or convex at a paraxial region O, and the image-side surface 32 of the third lens element is concave or convex at the paraxial region O; the fourth lens element has a concave object-side surface 41 at a paraxial region O, and a convex image-side surface 42 at the paraxial region O; the object-side surface 51 of the fifth lens element is concave or convex at the paraxial region O, and the image-side surface 52 of the fifth lens element is concave at the paraxial region O.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 57deg < FOV < 65deg;

Wherein the FOV is the maximum field angle of the optical lens.

The maximum angle of view of the optical lens is restrained, so that the optical lens has the characteristic of large angle of view, the visual field range of the optical lens is enlarged, and the optical lens is favorable for capturing object-end information.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: IMGH/f is more than 0.55 and less than 0.65; and/or 1.1 < TTL/f < 1.2;

wherein f is the focal length of the optical lens.

By restricting the ratio of the total length to the half image height of the optical lens, the optical lens can have the characteristic of large image surface while meeting miniaturization, so that the optical lens can be matched with an image sensor with larger size, and the imaging quality of the optical lens is improved.

In addition, the whole structure of the optical lens can be reasonably configured by restraining the ratio of the half image height to the focal length of the optical lens, so that the optical lens has a larger field angle, and the optical lens can adapt to long-distance shooting conditions.

In addition, the convergence capacity of the optical lens to incident light can be ensured by restraining the ratio of the total length to the focal length of the optical lens, so that the imaging range of the optical lens is ensured, the relative illuminance 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, the total length of the optical lens is too small, so that the sensitivity of the optical lens is easy to increase, and the difficulty of aberration correction is increased; when the ratio is higher than the upper limit, the total length of the optical lens is too large, so that the angle of the principal ray entering the imaging surface is too large, and the marginal view field ray cannot be imaged on the photosensitive surface, thereby causing the condition of incomplete imaging information.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: f1/f is more than 1.1 and less than 1.5; and/or 1.1 < f/f4 < 2.0; and/or-2 < f/f5 < -1;

wherein f is the focal length of the optical lens, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.

The refractive power of the first lens can be reasonably configured by restricting the ratio of the focal length of the first lens to the focal length of the optical lens, and the large-viewing angle characteristic of the optical lens can be supported by matching with the arrangement of the diaphragm on the object side of the first lens, and meanwhile, the aberration introduction amount is reduced, so that the aberration balance of the optical lens is facilitated, and the imaging quality of the optical lens is improved.

In addition, by restricting the ratio of the focal length of the optical lens to the focal length of the fourth lens, the refractive power of the fourth lens can be reasonably configured to balance astigmatism generated from the first lens to the third lens, so as to promote aberration balance of the optical lens and improve imaging quality of the optical lens.

In addition, by restricting the ratio of the focal length of the optical lens to the focal length of the fifth lens, the refractive power of the fifth lens can be reasonably configured to balance the high-order coma generated by the first lens to the fourth lens, so as to promote the aberration balance of the optical lens and facilitate the improvement of the imaging quality of the optical lens.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: CT4/ET4 is more than 1.3 and less than 1.7;

wherein CT4 is the thickness of the fourth lens element on the optical axis (i.e., the center thickness of the fourth lens element), and ET4 is the distance from the maximum effective half-caliber of the object-side surface of the fourth lens element to the image-side surface of the fourth lens element in a direction parallel to the optical axis (i.e., the edge thickness of the fourth lens element).

The bending degree and thickness ratio of the fourth lens can be reasonably controlled by restraining the ratio of the center thickness to the edge thickness of the fourth lens, so that the shape of the fourth lens is limited, the processing and forming of the fourth lens are facilitated, the processing and assembling difficulty is reduced, meanwhile, the field curvature of the optical lens can be corrected, and the imaging quality 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: SAG21/CT2 is more than 0.7 and less than 1; and/or 0.7 < SAG41/CT4 < 1.0; and/or 0.15 < SAG51/CT5 < 0.6;

wherein CT2 is the thickness of the second lens on the optical axis (i.e., the center thickness of the second lens), CT4 is the thickness of the fourth lens on the optical axis (i.e., the center thickness of the fourth lens), CT5 is the thickness of the fifth lens on the optical axis (i.e., the center thickness of the fifth lens), SAG21 is the distance between the intersection of the object side of the second lens and the optical axis and the maximum effective half-caliber of the object side of the second lens in the direction parallel to the optical axis (i.e., the sagittal height of the maximum effective half-caliber of the object side of the second lens), SAG41 is the distance between the intersection of the object side of the fourth lens and the optical axis and the maximum effective half-caliber of the object side of the fourth lens in the direction parallel to the optical axis (i.e., the sagittal height of the maximum effective half-caliber of the object side of the fourth lens), and SAG51 is the distance between the intersection of the object side of the fifth lens and the optical axis and the maximum effective half-caliber of the object side of the fifth lens in the direction parallel to the maximum effective half-caliber of the object side of the fifth lens.

The refractive power and the center thickness of the second lens element, the fourth lens element and the fifth lens element can be reasonably controlled by restricting the ratio of the sagittal height of the object-side surface of the second lens element to the center thickness of the second lens element, or restricting the ratio of the sagittal height of the object-side surface of the fourth lens element to the center thickness of the fourth lens element, or restricting the ratio of the sagittal height of the object-side surface of the fifth lens element to the center thickness of the fifth lens element, so as to reasonably distribute the refractive power of the second lens element, the fourth lens element and the fifth lens element in the direction perpendicular to the optical axis, thereby keeping the outgoing angle of the primary light rays as small as possible, reducing the incident angle of the light rays on the imaging plane, and further reducing the sensitivity of the optical lens element, and improving the imaging quality of the optical lens element, and simultaneously, the refractive power and the center thickness of the second lens element, the fourth lens element and the fifth lens element can be reasonably controlled by controlling the ratio of the sagittal height of the object-side surface of the second lens element, the fourth lens element and the center thickness of the fifth lens element, so as to improve the refractive power and the fifth lens element, and to reduce the manufacturing and manufacturing of the fourth lens element and fifth lens element.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 5 < |R31/R22| < 12; and/or, 0.32 < CT3/AT34 < 0.4;

wherein R22 is a radius of curvature of the image side surface of the second lens element AT the optical axis, R31 is a radius of curvature of the object side surface of the third lens element AT the optical axis, CT3 is a thickness of the third lens element on the optical axis (i.e., a center thickness of the third lens element), and AT34 is a distance from the image side surface of the third lens element to the object side surface of the fourth lens element on the optical axis (i.e., an air gap between the third lens element and the fourth lens element).

The ratio of the curvature radius of the object side surface of the third lens to the curvature radius of the image side surface of the second lens is limited, so that the surface matching degree of the image side surface of the second lens and the object side surface of the third lens at the paraxial region can be limited, a larger distance between the second lens and the third lens can be kept, the sensitivity of the optical lens is low, meanwhile, the aberration of the optical lens is effectively balanced, and the imaging quality of the optical lens is improved.

In addition, the ratio of the center thickness of the third lens to the air gap of the third lens and the air gap of the fourth lens are restrained, so that the bending degree of the image side surface of the third lens can be controlled, the light can be smoothly transited from the third lens to the fourth lens, the deflection angle of the light can be reduced, the aberration of the optical lens can be reduced, meanwhile, the air gap of the third lens and the air gap of the fourth lens can be reasonably controlled, the sensitivity of the optical lens can be reduced, and the imaging quality 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: CT1/CT2 is more than 2.5 and less than 4.0; and/or, 1.8 < CT4/CT3 < 3.0; and/or 0.65 < CT5/CT4 < 1.5;

wherein, CT1 is the thickness of the first lens on the optical axis (i.e. the center thickness of the first lens), 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), CT4 is the thickness of the fourth lens on the optical axis (i.e. the center thickness of the fourth lens), and CT5 is the thickness of the fifth lens on the optical axis (i.e. the center thickness of the fifth lens).

The miniaturization of the optical lens can be facilitated by restricting the ratio of the center thicknesses of the first lens and the second lens, or restricting the ratio of the center thickness of the fourth lens and the center thickness of the third lens, or restricting the ratio of the center thickness of the fifth lens and the center thickness of the fourth lens, and meanwhile, the distortion contribution of each lens can be controlled, so that the distortion of the optical lens is in a reasonable range, and the imaging quality 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: 0.5 < SD32/SD42 < 0.8; and/or 0.27 < BF/TTL < 0.38; and/or, 2 < f/D < 2.2;

the SD32 is the maximum effective half-caliber of the image side surface of the third lens element, the SD42 is the maximum effective half-caliber of the image side surface of the fourth lens element, the BF is the distance between the image side surface of the fifth lens element and the imaging surface of the optical lens element on the optical axis (i.e., the back focal length of the optical lens element), the TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis (i.e., the total length of the optical lens element), the f is the focal length of the optical lens element, and the D is the entrance pupil diameter of the optical lens element.

The deflection angle of the marginal view field light can be effectively reduced, the off-axis view field astigmatism can be improved, and the imaging quality of the optical lens can be improved by restraining the ratio of the maximum effective half caliber of the image side surface of the third lens to the maximum effective half caliber of the image side surface of the fourth lens, and meanwhile, the optical lens has a larger light-transmitting half caliber so as to increase the aperture of the optical lens, thereby meeting the characteristic of large aperture of the optical lens.

In addition, through restricting the ratio of the back focal length to the total length of the optical lens, the optical lens can have a back focal length which is long enough, so that the assembly of the optical lens is facilitated while the miniaturized design of the optical lens is met, the optical lens has a focusing operation space which is large enough, the focal length adjustment of the optical lens is facilitated, the space size from the image side surface to the imaging surface of the fifth lens is increased, the structural design of the camera module is facilitated, and the structural reliability of the camera module is improved.

In addition, the ratio of the focal length to the entrance pupil diameter of the optical lens is restrained, so that the optical lens has the characteristic of large aperture, and has enough light entering quantity, the relative illumination of the optical lens is improved, the imaging quality of the optical lens is improved, and the optical lens can adapt to shooting conditions with low brightness such as night scenes, stars and the like.

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 can meet the design requirement of miniaturization while ensuring the 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 can meet the design requirement of miniaturization while ensuring the 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 is provided with positive refractive power, and the object side surface and the image side surface of the first lens are respectively convex and concave at the paraxial region, so that incident light rays with large angles enter the optical lens, the field angle range of the optical lens is enlarged, the characteristic of large field angle is obtained, meanwhile, the incident light rays can be effectively converged, the dimension of the first lens in the direction perpendicular to the optical axis is favorably controlled, and the miniaturized design of the optical lens is met; the second lens and the third lens provide positive refractive power or negative refractive power for the optical lens, so that aberration balance of the optical lens can be effectively promoted, and therefore, the resolution of the optical lens is improved, meanwhile, the arrangement that the object side surface and the image side surface of the second lens are respectively convex and concave at a paraxial region is matched, so that incident light rays passing through the first lens can enter the optical lens more gently, the correction of curvature of field and coma of the optical lens is facilitated, the resolution change sensitivity of the optical lens is reduced, the imaging effect stability of the optical lens is enhanced, and the imaging quality of the optical lens is improved; the fourth lens element with positive refractive power has concave and convex object-side surfaces and image-side surfaces at paraxial regions, which facilitates converging incident light rays, reduces deflection angle of the light rays, effectively corrects spherical aberration of the optical lens element, and improves imaging quality of the optical lens element; the fifth lens element with negative refractive power is used to balance the aberration generated by the first lens element to the fourth lens element, thereby improving the aberration balance of the optical lens element and the resolution of the optical lens element, and further improving the imaging quality 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 structural view of an optical lens disclosed in a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a sixth embodiment of the present application;

FIG. 13 is a schematic view of the structure of the camera module disclosed in the present application;

fig. 14 is a schematic structural view of an electronic device disclosed in the present application.

Detailed Description

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 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 are disposed in order from an object side to an image side along an optical axis direction. 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 order from the object side of the first lens L1, and finally is imaged on the imaging surface 101 of the optical lens 100.

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

By reasonably configuring the surface shape and refractive power of each lens between the first lens L1 to the fifth lens L5, the optical lens 100 can satisfy the design requirement of miniaturization 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, so as to reduce the weight and cost of the optical lens 100. In other embodiments, the materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 may be glass, so that the optical lens 100 has good optical effect and reduces the temperature drift sensitivity of the optical lens 100.

In some embodiments, to increase the degree of freedom of the planar design, 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. It is understood that in other embodiments, for convenience of machining and shaping, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be spherical lenses.

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 satisfies the relationship: 57deg < FOV < 65deg, e.g. fov= 57.26deg, 59.84deg, 60.43deg, 60.64deg, 60.70deg, 61.69deg, 61.80deg, 62.25deg, 63.39deg or 64.72deg etc. Wherein FOV is the maximum field angle of the optical lens 100.

By restricting the maximum angle of view of the optical lens 100, the optical lens 100 has the characteristic of a large angle of view, so as to increase the field of view of the optical lens 100, and facilitate the optical lens 100 to capture object-side information.

In some embodiments, the optical lens 100 satisfies the relationship: 0.5 < SD32/SD42 < 0.8, e.g., SD32/SD42 = 0.526, 0.610, 0.658, 0.662, 0.670, 0.678, 0.684, 0.695, 0.741 or 0.785, etc. The SD32 is the maximum effective half-caliber of the image side surface 32 of the third lens element, and the SD42 is the maximum effective half-caliber of the image side surface 42 of the fourth lens element.

By restricting the ratio of the maximum effective half-caliber of the image side surface 32 of the third lens to the maximum effective half-caliber of the image side surface 42 of the fourth lens, the deflection angle of the marginal field light can be effectively reduced, the off-axis field astigmatism can be improved, the imaging quality of the optical lens 100 can be improved, and meanwhile, the optical lens 100 has a larger light-transmitting half-caliber so as to increase the aperture of the optical lens 100, thereby meeting the large aperture characteristic of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the relationship: 1.8 < TTL/IMGH < 2.0, e.g., TTL/imgh=1.814, 1.837, 1.856, 1.880, 1.902, 1.907, 1.928, 1.945, 1.962, or 1.994, etc. Where TTL is the distance between the object side surface 11 of the first lens element and the imaging surface 101 of the optical lens 100 on the optical axis O (i.e., the total length of the optical lens 100), and IMGH is the radius of the maximum effective imaging circle of the optical lens 100 (i.e., the half image height of the optical lens 100).

By restricting the ratio of the total length and half image height of the optical lens 100, the optical lens 100 can have the characteristic of large image surface while meeting miniaturization, so that the optical lens 100 can be matched with an image sensor with a larger size, and the imaging quality of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the relationship: 0.55 < IMGH/f < 0.65, e.g., IMGH/f=0.569, 0.574, 0.595, 0.598, 0.611, 0.612, 0.617, 0.621, 0.634, or 0.644, etc. Where IMGH is the radius of the maximum effective imaging circle of optical lens 100 (i.e., the half image height of optical lens 100), and f is the focal length of optical lens 100.

By restricting the ratio of the half image height to the focal length of the optical lens 100, the overall structure of the optical lens 100 can be reasonably configured, so that the optical lens 100 has a larger angle of view, and the optical lens 100 can adapt to long-distance shooting conditions.

In some embodiments, the optical lens 100 satisfies the relationship: 1.1 < TTL/f < 1.2, e.g., TTL/f=1.127, 1.135, 1.140, 1.156, 1.160, 1.161, 1.163, 1.173, 1.184, or 1.195, etc. Where TTL is the distance from the object side surface 11 of the first lens element 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), and f is the focal length of the optical lens 100.

By restricting the ratio of the total length to the focal length of the optical lens 100, the converging capability of the optical lens 100 to incident light can be ensured, so as to ensure the imaging range of the optical lens 100, and the relative illuminance of the optical lens 100 can be improved, thereby 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, so that the sensitivity of the optical lens 100 is easily increased, and the difficulty of aberration correction is increased; when the ratio is higher than the upper limit, the total length of the optical lens 100 is too large, so that the angle of the chief ray entering the imaging surface 101 is too large, which results in that the marginal view ray cannot be imaged on the photosensitive surface, and thus the imaging information is insufficient.

In some embodiments, the optical lens 100 satisfies the relationship: 1.1 < f1/f < 1.5, e.g., f1/f= 1.118, 1.123, 1.168, 1.231, 1.280, 1.342, 1.357, 1.436, 1.464, or 1.482, etc. Where f is the focal length of the optical lens 100, and f1 is the focal length of the first lens L1.

By restricting the ratio of the focal length of the first lens element L1 to the focal length of the optical lens element 100, the refractive power of the first lens element L1 can be reasonably configured, and the large viewing angle characteristic of the optical lens element 100 can be supported by matching with the arrangement of the stop on the object side of the first lens element L1, while reducing the amount of aberration introduced, thereby facilitating the aberration balance of the optical lens element 100 and improving the imaging quality of the optical lens element 100.

In some embodiments, the optical lens 100 satisfies the relationship: 1.1 < f/f4 < 2.0, e.g., f/f4= 1.156, 1.198, 1.296, 1.308, 1.322, 1.329, 1.437, 1.623, 1.841, or 1.935, etc. Where f is the focal length of the optical lens 100, and f4 is the focal length of the fourth lens L4.

By restricting the ratio of the focal length of the optical lens 100 to the focal length of the fourth lens element L4, the refractive power of the fourth lens element L4 can be reasonably configured to balance astigmatism generated by the first lens element L1 to the third lens element L3, promote aberration balance of the optical lens 100, and improve imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the relationship: -2 < f/f5 < -1, such as f/f5= -1.972, -1.846, -1.723, -1.466, -1.352, -1.138, -1.169, -1.157, -1.109 or-1.095. Where f is the focal length of the optical lens 100, and f5 is the focal length of the fifth lens L5.

By restricting the ratio of the focal length of the optical lens 100 to the focal length of the fifth lens element L5, the refractive power of the fifth lens element L5 can be reasonably configured to balance the advanced coma aberration generated by the first lens element L1 to the fourth lens element L4, so as to promote the aberration balance of the optical lens 100 and improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the relationship: 1.3 < CT4/ET4 < 1.7, e.g. CT 4/et4=1.327, 1.359, 1.420, 1.483, 1.525, 1.548, 1.591, 1.600, 1.646 or 1.679, etc. Wherein CT4 is the thickness of the fourth lens element L4 on the optical axis O (i.e., the center thickness of the fourth lens element L4), and ET4 is the distance from the maximum effective half-caliber of the object-side surface 41 of the fourth lens element to the maximum effective half-caliber of the image-side surface 42 of the fourth lens element in the direction parallel to the optical axis O (i.e., the edge thickness of the fourth lens element L4).

The ratio of the center thickness to the edge thickness of the fourth lens L4 is restrained, so that the bending degree and the thickness ratio of the fourth lens L4 can be reasonably controlled to limit the shape of the fourth lens L4, the processing and forming of the fourth lens L4 are facilitated, the processing and assembling difficulty is reduced, meanwhile, the correction of the field curvature of the optical lens 100 can be facilitated, and the imaging quality of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the relationship: SAG21/CT2 is more than 0.7 and less than 1; and/or 0.7 < SAG41/CT4 < 1.0; and/or 0.15 < SAG51/CT5 < 0.6, i.e., the optical lens 100 satisfies one or two of the three above-mentioned relationships, or the optical lens 100 satisfies the three above-mentioned relationships simultaneously. Exemplary, SAG 21/ct2=0.716, 0.738, 0.751, 0.779, 0.828, 0.849, 0.915, 0.923, 0.930, 0.984, or 0.993, etc., SAG 41/ct4=0.718, 0.721, 0.736, 0.741, 0.775, 0.829, 0.882, 0.905, 0.934, or 0.976, etc., SAG 51/ct5=0.164, 0.172, 0.263, 0.397, 0.414, 0.461, 0.495, 0.510, 0.548, or 0.583, etc. Wherein, CT2 is the thickness of the second lens element L2 on the optical axis O (i.e., the center thickness of the second lens element L2), CT4 is the thickness of the fourth lens element L4 on the optical axis O (i.e., the center thickness of the fourth lens element L4), CT5 is the thickness of the fifth lens element L5 on the optical axis O (i.e., the center thickness of the fifth lens element L5), SAG21 is the distance between the intersection point of the object side surface 21 of the second lens element and the optical axis O and the maximum effective half-diameter of the object side surface 21 of the second lens element in the direction parallel to the optical axis O (i.e., the sagittal height of the maximum effective half-diameter of the object side surface 41 of the fourth lens element), SAG41 is the distance between the intersection point of the object side surface 51 of the fifth lens element and the optical axis O and the maximum effective half-diameter of the object side surface 51 of the fifth lens element in the direction parallel to the optical axis O (i.e., the maximum effective half-diameter of the object side surface 51 of the fifth lens element in the direction parallel to the maximum effective half-diameter of the optical axis O).

The ratio of the sagittal height of the object-side surface 21 of the second lens element to the central thickness of the second lens element L2 is restricted, or the ratio of the sagittal height of the object-side surface 41 of the fourth lens element to the central thickness of the fourth lens element L4 is restricted, or the ratio of the sagittal height of the object-side surface 51 of the fifth lens element to the central thickness of the fifth lens element L5 is restricted, so that the refractive power and the central thickness of the second lens element L2, the fourth lens element L4 and the fifth lens element L5 can be reasonably controlled, the refractive power of the second lens element L2, the fourth lens element L4 and the fifth lens element L5 in the direction perpendicular to the optical axis O can be reasonably distributed, the incident angle of the primary light ray on the imaging plane 101 can be kept as small, the sensitivity of the optical lens 100 can be further reduced, the imaging quality of the optical lens 100 can be improved, and the refractive power and the central thicknesses of the second lens element L2, the fourth lens element L4 and the fifth lens element L5 can be reasonably controlled, the refractive power of the second lens element L2, the fourth lens element L4 and the fifth lens element L5 can be favorably controlled, and the fourth lens element L4 and the fifth lens element L5 can be favorably manufactured, and the refractive power of the fourth lens element L2 and the fifth lens element L5 can be favorably reduced.

In some embodiments, the optical lens 100 satisfies the relationship: 5 < |r31/r22| < 12, for example |r31/r22|= 5.267, 5.601, 6.112, 7.035, 7.480, 8.817, 9.475, 10.468, 11.297 or 11.536, etc. Wherein R22 is a radius of curvature of the image side surface 22 of the second lens element at the optical axis O, and R31 is a radius of curvature of the object side surface 31 of the third lens element at the optical axis O.

By restricting the ratio of the radius of curvature of the object-side surface 31 of the third lens to the radius of curvature of the image-side surface 22 of the second lens, the surface-type matching degree of the image-side surface 22 of the second lens and the object-side surface 31 of the third lens at the paraxial region O can be restricted, so that a larger distance between the second lens L2 and the third lens L3 can be kept, the sensitivity of the optical lens 100 can be reduced, the aberration of the optical lens 100 can be effectively balanced, and the imaging quality of the optical lens 100 can be improved.

In some embodiments, the optical lens 100 satisfies the relationship: 0.32 < CT3/AT34 < 0.4, e.g., CT3/AT34 = 0.321, 0.325, 0.328, 0.333, 0.337, 0.341, 0.360, 0.371, 0.385, or 0.396, etc. Wherein, CT3 is the thickness of the third lens element L3 on the optical axis O (i.e., the center thickness of the third lens element L3), and AT34 is the distance between the image side surface 32 of the third lens element and the object side surface 41 of the fourth lens element on the optical axis O (i.e., the air gap between the third lens element L3 and the fourth lens element L4).

By restricting the ratio of the center thickness of the third lens L3 to the air gaps of the third lens L3 and the fourth lens L4, the bending degree of the image side surface 32 of the third lens can be advantageously controlled, smooth transition of light from the third lens L3 to the fourth lens L4 is facilitated, the deflection angle of the light is reduced, aberration of the optical lens 100 is advantageously reduced, and at the same time, the air gaps of the third lens L3 and the fourth lens L4 can be reasonably controlled to reduce the sensitivity of the optical lens 100, thereby improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the relationship: CT1/CT2 is more than 2.5 and less than 4.0; and/or, 1.8 < CT4/CT3 < 3.0; and/or 0.65 < CT5/CT4 < 1.5, i.e., the optical lens 100 satisfies one or two of the three above-mentioned relational expressions, or the optical lens 100 satisfies the three above-mentioned relational expressions simultaneously. Exemplary, CT 1/ct2=2.534, 2.678, 2.706, 2.895, 3.046, 3.278, 3.303, 3.412, 3.762, or 3.921, etc., CT 4/ct3= 1.853, 1.926, 2.111, 2.475, 2.506, 2.662, 2.683, 2.789, 2.834, or 2.947, etc., CT 5/ct4=0.661, 0.697, 0.705, 0.720, 0.837, 0.927, 1.026, 1.282, 1.450, or 1.487, etc. Wherein, CT1 is the thickness of the first lens L1 on the optical axis O (i.e., the center thickness of the first lens L1), 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), CT4 is the thickness of the fourth lens L4 on the optical axis O (i.e., the center thickness of the fourth lens L4), and CT5 is the thickness of the fifth lens L5 on the optical axis O (i.e., the center thickness of the fifth lens L5).

By restricting the ratio of the center thicknesses of the first lens L1 and the second lens L2, or by restricting the ratio of the center thicknesses of the fourth lens L4 and the third lens L3, or by restricting the ratio of the center thicknesses of the fifth lens L5 and the fourth lens L4, miniaturization of the optical lens 100 can be facilitated, while the distortion contribution amounts of the respective lenses can be advantageously controlled so that the distortion amount of the optical lens 100 is within a reasonable range to improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the relationship: 0.27 < BF/TTL < 0.38, e.g., BF/ttl=0.275, 0.286, 0.291, 0.306, 0.328, 0.355, 0.362, 0.367, 0.371, or 0.378, etc. Where BF is the distance between the image side surface 52 of the fifth lens element and the imaging surface 101 of the optical lens assembly 100 on the optical axis O (i.e., the back focal length of the optical lens assembly 100), and TTL is the distance between the object side surface 11 of the first lens element and the imaging surface 101 of the optical lens assembly 100 on the optical axis O (i.e., the total length of the optical lens assembly 100).

By restricting the ratio of the back focal length to the total length of the optical lens 100, the optical lens 100 can have a sufficiently long back focal length, so that the assembly of the optical lens 100 is facilitated while the miniaturized design of the optical lens 100 is satisfied, and the optical lens 100 has a sufficiently large focusing operation space, so that the focal length adjustment of the optical lens 100 is facilitated, the space size from the image side surface 52 to the imaging surface 101 of the fifth lens is increased, the structural design of the image pickup module is facilitated, and the structural reliability of the image pickup module is improved.

In some embodiments, the optical lens 100 satisfies the relationship: 2 < f/D < 2.2, e.g. f/d=2.002, 2.008, 2.058, 2.072, 2.126, 2.135, 2.175, 2.190, 2.191 or 2.192, etc. Where f is the focal length of the optical lens 100 and D is the entrance pupil diameter of the optical lens 100.

By restricting the ratio of the focal length to the entrance pupil diameter of the optical lens 100, the optical lens 100 can have a characteristic of a large aperture, so that the optical lens 100 has a sufficient light entering amount, thereby improving the relative illuminance of the optical lens 100, further improving the imaging quality of the optical lens 100, and enabling the optical lens 100 to be suitable for shooting conditions with low brightness such as night scenes, stars and the like.

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, and a fifth lens L5 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 positive refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive 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 11 of the first lens element is convex at the paraxial region O, and the image-side surface 12 of the first lens element is concave at the paraxial region O; the object-side surface 21 of the second lens element is convex at a paraxial region O, and the image-side surface 22 of the second lens element is concave at the paraxial region O; the object side surface 31 of the third lens element is concave at a paraxial region O, and the image side surface 32 of the third lens element is convex at the paraxial region O; the fourth lens element has a concave object-side surface 41 at a paraxial region O, and a convex image-side surface 42 at the paraxial region O; the object-side surface 51 of the fifth lens element is convex at a paraxial region O, and the image-side surface 52 of the fifth lens element is concave at the paraxial region O.

Specifically, taking the focal length f=6.00 mm of the optical lens 100, the f-number fno=2.19 of the optical lens 100, the maximum field angle fov= 61.80deg of the optical lens 100, the optical total length ttl=6.98 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 the smaller surface number is the object side surface of the lens element, and the surface with the 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 11 of the first lens element and the image side surface 12 of the first lens element, 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 of the surface and the optical axis O) on the optical axis O, and the direction from the object side surface 11 of the first lens to the image side surface of the last lens is the positive direction of the optical axis O by default. It is understood that the units of the radius, thickness and focal length of Y in table 1 are all mm, and the refractive index and abbe number in table 1 are all obtained at a reference wavelength of 587.6nm, and the reference wavelength of the focal length is 950.00nm.

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

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows longitudinal spherical aberration diagrams of the optical lens 100 in the first embodiment at wavelengths of 930.00nm, 940.00nm, 950.00nm, 960.00nm and 970.00nm, respectively. Wherein the abscissa along the X-axis represents focus offset in mm and the ordinate along the Y-axis represents 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) shows an astigmatism diagram of the optical lens 100 at a wavelength of 950.00nm 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. T in the astigmatism diagram indicates a curvature of the imaging surface 101 in the meridian direction, and S indicates a curvature of the imaging surface 101 in the sagittal direction. As can be seen from fig. 2 (B), at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2 (C), fig. 2 (C) shows a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 950.00nm. 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, and a fifth lens L5, which are sequentially disposed from an object side to an image side along an optical axis O. The materials may be described in the above embodiments, and will not be described herein. Further, the second lens element L2 with negative refractive power has the same refractive power and surface configuration as those of the first embodiment, and thus will not be described in detail herein.

Specifically, taking the focal length f=6.01 mm of the optical lens 100, the f-number fno=2.19 of the optical lens 100, the maximum field angle fov= 61.69deg of the optical lens 100, and the optical total length ttl=6.98 mm of the optical lens 100 as an example. Other parameters in this second embodiment are given in tables 3 and 4 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 3 are all mm, and the refractive index and abbe number in table 3 are all obtained at a reference wavelength of 587.6nm, and the reference wavelength of the focal length is 950.00nm.

TABLE 3 Table 3

TABLE 4 Table 4

Referring to fig. 4, as can be seen from the (a) longitudinal spherical aberration diagram, (B) astigmatism diagram and (C) distortion diagram in fig. 4, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the second embodiment 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. 4 (a), 4 (B) and 4 (C), reference may be made to the description in the first embodiment regarding fig. 2 (a), 2 (B) and 2 (C), and the description is omitted 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, and a fifth lens L5, which are sequentially disposed from an object side to an image side along an optical axis O. The materials may be described in the above embodiments, and will not be described herein. Further, the object-side surface 31 of the third lens element is convex at the paraxial region O, the image-side surface 32 of the third lens element is concave at the paraxial region O, and the refractive power and the surface-type configuration of the other lens elements are the same as those of the first embodiment, which will not be described herein.

Specifically, taking the focal length f=5.95 mm of the optical lens 100, the f-number fno=2.19 of the optical lens 100, the maximum field angle fov= 62.25deg of the optical lens 100, and the optical total length ttl=6.90 mm of the optical lens 100 as an example. Other parameters in this third embodiment are given in tables 5 and 6 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 5 are all mm, and the refractive index and abbe number in table 5 are all obtained at a reference wavelength of 587.6nm, and the reference wavelength of the focal length is 950.00nm.

TABLE 5

TABLE 6

Referring to fig. 6, as can be seen from the (a) longitudinal spherical aberration diagram, (B) astigmatism diagram and (C) distortion diagram in fig. 6, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the third embodiment are all well controlled, so that the optical lens 100 of this 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 the description in fig. 2 (a), 2 (B) and 2 (C) in the first embodiment, and the description is 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, and a fifth lens L5, which are sequentially disposed from an object side to an image side along an optical axis O. The materials may be described in the above embodiments, and will not be described herein. Further, the third lens element L3 with negative refractive power has the same refractive power and surface configuration as those of the first embodiment, and thus will not be described herein.

Specifically, taking the focal length f=6.14 mm of the optical lens 100, the f-number fno=2.19 of the optical lens 100, the maximum field angle fov= 60.70deg of the optical lens 100, and the optical total length ttl=7.00 mm of the optical lens 100 as an example. Other parameters in this fourth embodiment are given in tables 7 and 8 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 7 are all mm, and the refractive index and abbe number in table 7 are all obtained at a reference wavelength of 587.6nm, and the reference wavelength of the focal length is 950.00nm.

TABLE 7

TABLE 8

Referring to fig. 8, as can be seen from the (a) longitudinal spherical aberration diagram, (B) astigmatism diagram and (C) distortion diagram in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the fourth embodiment are all well controlled, so that the optical lens 100 of this 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 the description in fig. 2 (a), 2 (B) and 2 (C) in the first embodiment, and the description is 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, and a fifth lens L5, which are sequentially disposed from an object side to an image side along an optical axis O. The materials may be described in the above embodiments, and will not be described herein. Further, the object-side surface 31 of the third lens element is convex at the paraxial region O, and the refractive power and the surface-type configuration of the other lens element are the same as those of the first embodiment, which will not be described herein.

Specifically, taking the focal length f=6.14 mm of the optical lens 100, the f-number fno=2.01 of the optical lens 100, the maximum field angle fov=60.64 deg of the optical lens 100, and the optical total length ttl=7.20 mm of the optical lens 100 as an example. Other parameters in this fifth embodiment are given in tables 9 and 10 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 9 are all mm, and the refractive index and abbe number in table 9 are all obtained at a reference wavelength of 587.6nm, and the reference wavelength of the focal length is 950.00nm.

TABLE 9

Table 10

Referring to fig. 10, as can be seen from the (a) longitudinal spherical aberration diagram, (B) astigmatism diagram and (C) distortion diagram in fig. 10, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the fifth embodiment are all well controlled, so that the optical lens 100 of this 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 the description in fig. 2 (a), 2 (B) and 2 (C) in the first embodiment, and the description is omitted here.

Sixth embodiment

As shown in fig. 11, the optical lens 100 according to the sixth embodiment of the present application 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. The materials may be described in the above embodiments, and will not be described herein. Further, the second lens element L2 with negative refractive power has a concave object-side surface 51 at a paraxial region O, and the refractive power and the surface configuration of the other lens elements are the same as those of the first embodiment, which will not be described herein.

Specifically, taking the focal length f=6.17 mm of the optical lens 100, the f-number fno=2.19 of the optical lens 100, the maximum field angle fov= 60.43deg of the optical lens 100, and the optical total length ttl=7.00 mm of the optical lens 100 as an example. Other parameters in this sixth embodiment are given in the following tables 11 and 12, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 11 are all mm, and the refractive index and abbe number in table 11 are all obtained at a reference wavelength of 587.6nm, and the reference wavelength of the focal length is 950.00nm.

TABLE 11

Table 12

Referring to fig. 12, as can be seen from the (a) longitudinal spherical aberration diagram, (B) astigmatism diagram and (C) distortion diagram in fig. 12, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 in the sixth embodiment are all well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 12 (a), 12 (B) and 12 (C), reference may be made to the description in the first embodiment regarding fig. 2 (a), 2 (B) and 2 (C), and the description is omitted here.

Referring to table 13, table 13 is a summary of the ratios of the relationships in the first embodiment to the sixth embodiment of the present application.

TABLE 13

Referring to fig. 13, in a second aspect, 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 sixth embodiments of the first aspect, where 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 satisfies the design requirement for miniaturization while ensuring the 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. 14, in a third aspect, the present application further discloses an electronic device 300, where the electronic device 300 includes a housing 301 and the camera module 200 according to the second aspect, and the camera module 200 is disposed on 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, while ensuring imaging quality, the design requirement for miniaturization is satisfied. 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 first, second, third and various numerical numbers referred to herein are merely descriptive convenience and are not intended to limit the scope of the present application.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

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 refractive power;

the optical lens satisfies the following relation:

1.8＜TTL/IMGH＜2.0；

2.0＜f/D＜2.2；

57deg＜FOV＜65deg；

wherein 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, IMGH is the radius of the maximum effective imaging circle of the optical lens, f is the focal length of the optical lens, D is the entrance pupil diameter of the optical 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 relationship:

IMGH/f is more than 0.55 and less than 0.65; and/or 1.1 < TTL/f < 1.2.

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

f1/f is more than 1.1 and less than 1.5; and/or 1.1 < f/f4 < 2.0; and/or-2 < f/f5 < -1;

Wherein f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.

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

1.3＜CT4/ET4＜1.7；

wherein CT4 is the thickness of the fourth lens element on the optical axis, and ET4 is the distance from the maximum effective half-caliber of the object-side surface of the fourth lens element to the maximum effective half-caliber of the image-side surface of the fourth lens element in a direction parallel to the optical axis.

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

SAG21/CT2 is more than 0.7 and less than 1; and/or 0.7 < SAG41/CT4 < 1.0; and/or 0.15 < SAG51/CT5 < 0.6;

wherein, CT2 is the thickness of the second lens element on the optical axis, CT4 is the thickness of the fourth lens element on the optical axis, CT5 is the thickness of the fifth lens element on the optical axis, SAG21 is the distance from the intersection point of the object side surface of the second lens element and the optical axis to the maximum effective half-caliber of the object side surface of the second lens element in the direction parallel to the optical axis, SAG41 is the distance from the intersection point of the object side surface of the fourth lens element and the optical axis to the maximum effective half-caliber of the object side surface of the fourth lens element in the direction parallel to the optical axis, and SAG51 is the distance from the intersection point of the object side surface of the fifth lens element and the optical axis to the maximum effective half-caliber of the object side surface of the fifth lens element in the direction parallel to the optical axis.

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

5 < |R31/R22| < 12; and/or, 0.32 < CT3/AT34 < 0.4;

wherein R22 is a radius of curvature of the image side surface of the second lens element AT the optical axis, R31 is a radius of curvature of the object side surface of the third lens element AT the optical axis, CT3 is a thickness of the third lens element on the optical axis, and AT34 is a distance from the image side surface of the third lens element to the object side surface of the fourth lens element on the optical axis.

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

CT1/CT2 is more than 2.5 and less than 4.0; and/or, 1.8 < CT4/CT3 < 3.0; and/or 0.65 < CT5/CT4 < 1.5;

wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis.

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

0.5 < SD32/SD42 < 0.8; and/or 0.27 < BF/TTL < 0.38;

wherein SD32 is the maximum effective half-caliber of the image side surface of the third lens element, SD42 is the maximum effective half-caliber of the image side surface of the fourth lens element, and BF is the distance between the image side surface of the fifth lens element and the imaging surface of the optical lens element on the optical axis.

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.