CN113866961B

CN113866961B - Optical lens, camera module and electronic equipment

Info

Publication number: CN113866961B
Application number: CN202111471680.1A
Authority: CN
Inventors: 邹金华; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-04-12
Anticipated expiration: 2041-12-06
Also published as: CN113866961A

Abstract

The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, the first lens, the third lens and the fourth lens have positive refractive power, the object side surface of the first lens is a convex surface, the second lens has negative refractive power, the object side surface of the second lens is a concave surface at the circumference, the fifth lens has negative refractive power, the object side surface and the image side surface of the fifth lens are respectively a convex surface and a concave surface at the position close to the optical axis, and the sixth lens has refractive power; the optical lens satisfies the following relation: 1.1< CT1/SD11< 1.8. The optical lens, the camera module and the electronic equipment provided by the invention can meet the requirement of high imaging quality of the optical lens and realize the miniaturization design of the optical lens.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the continuous development of the camera technology, the imaging quality of the optical lens is required to be higher and higher, and meanwhile, with the improvement of the miniaturization design requirement of the electronic equipment, the miniaturization design challenge is also provided for the optical lens applied to the electronic equipment. In the related art, it is difficult to satisfy the imaging quality of the optical lens at the same time in the trend of miniaturization design of the optical lens.

Disclosure of Invention

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

In order to achieve the above object, a first aspect of the present invention discloses an optical lens including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens:

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

the second lens element with negative refractive power has a concave object-side surface at the circumference;

the third lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;

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

the fifth lens element with negative refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;

the sixth lens element with refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;

the optical lens satisfies the following relation:

1.1<CT1/SD11<1.8；

wherein CT1 is the thickness of the first lens on the optical axis, and SD11 is the maximum effective half aperture of the object-side surface of the first lens.

The optical lens comprises a first lens with positive refractive power, the total length of the optical lens is favorably compressed, the object side surface of the first lens is a convex surface at a paraxial region, light rays of each field of view uniformly enter the optical lens, so that an image of an imaging surface is uniform and clear, the object side surface and the image side surface of the first lens are convex surfaces at the paraxial region, the positive refractive power of the first lens is favorably enhanced, and the total length of the optical lens is further shortened; the second lens with negative refractive power can balance the aberration generated by the first lens for compressing the total length of the optical lens, and the object side surface of the second lens is concave at the circumference, so that the deflection angle of marginal field rays can be adjusted, and the aberration such as coma aberration and the like can be reduced; the third lens with positive refractive power is beneficial to correcting the marginal aberration generated by the first lens and the second lens in the marginal field of view, so that the imaging resolution is improved; the fourth lens with positive refractive power and the fifth lens with negative refractive power are beneficial to further correcting aberration generated by the refraction and rotation of light rays through the first lens and the second lens, so that the imaging resolution of the optical lens is improved; the object side surface of the sixth lens element is convex at the paraxial region, which is beneficial to correcting the aberration of the optical lens and improving the imaging quality of the optical lens, and the image side surface of the sixth lens element is concave at the paraxial region, which is beneficial to shortening the optical back focus of the optical lens, thereby being beneficial to the miniaturization design of the optical lens.

In addition, the optical lens provided by the application selects a proper number of lenses and reasonably configures the refractive power and the surface shape of each lens, so that the optical lens meets the following relational expression: 1.1< CT1/SD11<1.8, so that the surface shape of the first lens is adjusted, the outer diameter of the first lens is compressed, the head caliber size of the optical lens is small, the head depth of the optical lens is large, and the miniaturization of the lens is realized; when the CT1/SD11 is less than or equal to 1.1, the thickness of the first lens is insufficient, which is not beneficial to increasing the head depth of the optical lens; when CT1/SD11 is larger than or equal to 1.8, the thickness of the first lens is too large, which is not beneficial to reducing the total length of the optical lens and causes that the field curvature aberration of the optical lens is difficult to correct.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 50 ° < HFOV <55 °, and 0.9< f1 tan (HFOV)/TTL < 1.6. Wherein, HFOV is half of the maximum field angle of the optical lens, TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens element, i.e. the total optical length of the optical lens element, and f1 is the effective focal length of the first lens element. When the relational expression is satisfied, the optical lens has a larger angle of view and a shorter total length, so that the optical lens is arranged closely, and the miniaturization design of the optical lens is realized; when f1 star (hfov)/TTL is less than 0.9, the refractive power provided by the first lens element is insufficient, which is not favorable for miniaturization of the optical lens system; when f1 star (hfov)/TTL >1.6, the field angle of the optical lens is too large, which causes too large distortion of the peripheral field, distortion of the image periphery, and poor imaging quality.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.5< f1/CT1< 8.0; wherein f1 is the effective focal length of the first lens. When the above relation is satisfied, it is beneficial to adjust the refractive power of the first lens element and compress the volume of the object side end of the optical lens, so that the head of the optical lens is miniaturized.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 5< (CT1+ CT2+ CT3)/(T12+ T23) < 20; wherein CT2 is a thickness of the second lens element on the optical axis, CT3 is a thickness of the third lens element on the optical axis, T12 is a distance between the first and second lens elements on the optical axis, and T23 is a distance between the second and third lens elements on the optical axis. When the above relation is satisfied, enough space is left for assembling the first lens, the second lens and the third lens, and collision between the first lens and the second lens or between the second lens and the third lens is avoided. When (CT1+ CT2+ CT3)/(T12+ T23) is less than or equal to 5, the depth of the optical lens head structure is not favorably increased, and when (CT1+ CT2+ CT3)/(T12+ T23) is more than or equal to 20, the thickness of the first lens is overlarge, the volume of the optical lens is not favorably compressed, and the aberration of the optical lens is difficult to correct.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.4< T34/CT4< 1.0; wherein T34 is a distance between the third lens and the fourth lens on the optical axis, and CT4 is a thickness of the fourth lens on the optical axis. When the above relation is satisfied, the third lens and the fourth lens are matched with each other to adjust the deflection angle of the light, which is helpful to increase the field angle and the imaging area of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.0< f1/f34< 3.0; wherein f1 is an effective focal length of the first lens, and f34 is a combined focal length of the third lens and the fourth lens. The third lens and the fourth lens which satisfy the relational expression can make up the deficiency of the light convergence capacity of the first lens, strengthen the focusing capacity of the first lens to light, and reduce the sensitivity of the single lens, on the basis, if the object side surfaces of the third lens and the fourth lens are concave surfaces at the circumference, that is, the object side surfaces of the third lens and the fourth lens are bent towards the object side at the circumference, which is beneficial to reducing the deflection angle of marginal field rays, and further improving the field angle of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.3< ET4/CT4< 0.5; ET4 is a distance from a maximum effective half aperture of an object-side surface of the fourth lens element to a maximum effective half aperture of an image-side surface of the fourth lens element in the optical axis direction, that is, ET4 is an edge thickness of the fourth lens element, and CT4 is a thickness of the fourth lens element in the optical axis direction. When the relation is satisfied, the surface shape and the thickness ratio of the fourth lens can be effectively controlled, the distortion of the optical lens can be balanced and corrected, and the imaging quality of the optical lens is ensured. When ET4/CT4<0.3, the edge thickness of the fourth lens is too small, making molding of the fourth lens difficult; when ET4/CT4>0.50, the difference between the edge thickness of the fourth lens element and the thickness of the fourth lens element on the optical axis is too small, which tends to cause the surface shape of the fourth lens element to be too smooth, and the optical lens has insufficient correction space for aberration such as distortion, thereby affecting the imaging quality of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -6< f4/R9< -2.0; wherein f4 is an effective focal length of the fourth lens, and R9 is a radius of curvature of an image side surface of the fourth lens. The relation between the effective focal length of the fourth lens and the curvature radius of the image side surface of the fourth lens is reasonably configured, so that the incident angle of light entering the photosensitive chip can be effectively controlled, meanwhile, the sensitivity of the fourth lens can be reduced, the distortion aberration of the optical lens is improved, the optical lens has smaller optical distortion, and the imaging quality is improved. Meanwhile, the curvature radius of the object side surface of the fourth lens is adjusted, so that the situation that large-angle light rays are totally reflected inside the fourth lens can be avoided, and the influence of ghost images and stray light on imaging quality is reduced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -3.0< R10/f5< -0.3; wherein f5 is an effective focal length of the fifth lens, and R10 is a radius of curvature of an object side surface of the fifth lens. When the relational expression is satisfied, the field angle of the optical lens can be effectively enlarged, and simultaneously, the astigmatic aberration of the optical lens can be favorably improved, and the imaging quality of the optical lens can be improved. When R10/f5 is greater than or equal to-0.3, the negative refractive power provided by the fifth lens element is insufficient, and the spherical aberration of the optical lens system is too large. When R10/f5 is less than or equal to-3, the edge of the aperture of the fifth lens can be excessively bent, so that the stray light of the optical lens is increased, and the imaging quality is influenced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.05< | SAG51|/| SAG52| < 0.65; SAG51 is a distance from an intersection point of an object side surface of the fifth lens and the optical axis to a maximum effective semi-aperture of the object side surface of the fifth lens in the optical axis direction, and SAG52 is a distance from an intersection point of an image side surface of the fifth lens and the optical axis to a maximum effective semi-aperture of the image side surface of the fifth lens in the optical axis direction. When the relation is satisfied, the edge field aberration of the optical lens is favorably corrected, the imaging quality is satisfied, and meanwhile, the fifth lens has a more proper shape, the manufacturing and the molding of the fifth lens are favorably realized, and the defect of poor molding is reduced. When SAG51/SAG52 is not less than 0.65, the image side surface of the fifth lens is excessively curved, which may result in poor molding of the fifth lens and affect the manufacturing yield. When SAG51/SAG52 is less than or equal to 0.05, the object side surface of the fifth lens is too smooth, the refractive power of the off-axis field is insufficient, and the distortion and the field curvature aberration of the optical lens are not corrected favorably.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.5< R12/R13< 1.5; wherein R12 is a radius of curvature of an object-side surface of the sixth lens element, and R13 is a radius of curvature of an image-side surface of the sixth lens element. When the above relation is satisfied, it is beneficial to adjust the surface shape and refractive power of the sixth lens element, correct the peripheral aberration of the optical lens, and make the sixth lens element have positive refractive power or negative refractive power, and when the sixth lens element has positive refractive power, the back focal length of the optical lens can be adjusted, so as to further shorten the total length of the optical lens; when the sixth lens element has negative refractive power, the field angle of the optical lens assembly can be further increased, so that the optical lens assembly can obtain a larger field of view.

In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, wherein the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can meet the requirement of high imaging quality of the optical lens and realize the miniaturization design of the optical lens. When the optical lens is packaged below the screen of the electronic equipment, the size of the opening of the screen of the electronic equipment can be reduced.

In a third aspect, the invention discloses an electronic device, which includes a housing and the camera module set of the second aspect, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module can meet the high imaging quality of the optical lens and realize the miniaturization design of the optical lens. When the optical lens is packaged below the screen of the electronic equipment, the size of the opening of the screen of the electronic equipment can be reduced.

Compared with the prior art, the invention has the beneficial effects that: according to the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the optical lens adopts six lenses, and the refractive power and the surface shape of each lens are designed, and simultaneously the optical lens meets the following relational expression: 1.1< CT1/SD11<1.8, can correct aberrations such as curvature of field and coma of the optical lens, meet the high imaging quality requirement of the optical lens, make the total length of the optical lens shorter at the same time, realize the miniaturized design of the optical lens, especially the head caliber size of the optical lens is smaller, the head depth is larger, thus when the optical lens is packaged under the screen of the electronic equipment, the opening size of the screen of the electronic equipment can be reduced.

Drawings

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

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

fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

fig. 4 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 8 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 11 is a schematic structural diagram of an optical lens disclosed in a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 13 is a schematic structural diagram of an optical lens disclosed in a seventh embodiment of the present application;

fig. 14 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 15 is a schematic structural diagram of the camera module disclosed in the present application;

fig. 16 is a schematic structural diagram of an electronic device disclosed in the present application.

Detailed Description

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

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

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

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

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

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

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, which are disposed in order 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, the fifth lens L5 and the sixth lens L6 in sequence from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 and the fourth lens element L4 have positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has refractive power (e.g., positive refractive power or negative refractive power).

Further, the object-side surface S1 of the first lens element L1 may be convex at the paraxial region O, the image-side surface S2 of the first lens element L1 may be convex at the paraxial region O, the object-side surface S3 of the second lens element L2 may be convex or concave at the paraxial region O, the image-side surface S4 of the second lens element L2 may be convex or concave at the paraxial region O, the object-side surface S3 of the second lens element L2 may be concave at the paraxial region, the object-side surface S5 of the third lens element L3 may be convex at the paraxial region O, the image-side surface S6 of the third lens element L3 may be concave at the paraxial region O, the object-side surface S7 of the fourth lens element L4 may be concave at the paraxial region O, the image-side surface S8 of the fourth lens element L4 may be convex at the paraxial region O, the object-side surface S9 of the fifth lens element L5 may be convex at the paraxial region O, the object-side surface S862 may be convex at the paraxial region S8653, the image-side surface S12 of the sixth lens element L6 may be concave at the paraxial region O.

As can be seen from the above, the optical lens system 100 includes the first lens element L1 with positive refractive power, which is favorable for compressing the total length of the optical lens system 100, the object-side surface of the first lens element L1 is convex at the paraxial region O, which is favorable for light rays of each field of view to uniformly enter the optical lens system 100, so that an image of the image plane 101 is uniformly and clearly formed, and both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region O, which is favorable for enhancing the positive refractive power of the first lens element L1, and further shortening the total length of the optical lens system 100; the second lens element L2 with negative refractive power can balance the aberration generated by the first lens element L1 for compressing the total length of the optical lens system 100; the object side surface of the second lens L2 is a concave surface at the circumference, so that the deflection angle of the marginal field of view light can be adjusted, and the aberrations such as coma aberration and the like can be reduced; the third lens element L3 with positive refractive power is favorable for correcting the peripheral aberration generated by the first lens element L1 and the second lens element L2 in the peripheral field, so as to improve the imaging resolution; the fourth lens element L4 with positive refractive power and the fifth lens element L5 with negative refractive power are favorable for further correcting aberration generated by the refraction of light rays through the first lens element L1 and the second lens element L2, so as to improve the imaging resolution of the optical lens 100; the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region O, which is favorable for correcting the aberration of the optical lens 100 and improving the imaging quality of the optical lens 100, and the image-side surface S12 of the sixth lens element L6 is concave at the paraxial region O, which is favorable for shortening the optical back focus of the optical lens 100, thereby being favorable for the miniaturization design of the optical lens 100.

In some embodiments, the optical lens 100 may be applied to electronic devices such as smart phones and smart tablets, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be made of plastic, so that the optical lens 100 has a good optical effect and at the same time has good portability. In addition, the plastic material is easier to process the lens, so that the processing cost of the optical lens can be reduced.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop or a field stop, which may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1. It is understood that, in other embodiments, the stop 102 may also be disposed between two adjacent lenses, for example, between the second lens L2 and the third lens L3, and the arrangement is adjusted according to the actual situation, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter L7, such as an infrared filter, disposed between the image side surface S12 of the sixth lens element L6 and the image plane 101 of the optical lens 100, so as to filter out light in other bands, such as visible light, and only allow infrared light to pass through, and therefore the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can image in a dark environment and other special application scenes and can obtain a better image effect.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.1< CT1/SD11<1.8, where CT1 is the thickness of the first lens L1 on the optical axis O, and SD11 is the maximum effective half-aperture of the object-side surface S1 of the first lens L1. When the optical lens 100 satisfies the above relation, it is beneficial to adjust the surface shape of the first lens L1 and compress the outer diameter of the first lens L1, so that the size of the head caliber of the optical lens 100 is small, and the head depth of the optical lens 100 is large, thereby realizing the miniaturization of the lens; when the lower limit of the above relation is exceeded, the thickness of the first lens L1 is insufficient, which is disadvantageous for increasing the head depth of the optical lens 100; when the upper limit of the above relation is exceeded, the thickness of the first lens L1 is too large, which is disadvantageous for reducing the total length of the optical lens 100 and causes difficulty in correcting the field curvature aberration of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 50 ° < HFOV <55 °, and 0.9< f1 × tan (HFOV)/TTL <1.6, where HFOV is half of the maximum field angle of the optical lens 100, TTL is the distance on the optical axis O from the object-side surface S1 of the first lens L1 to the image plane 101 of the optical lens 100, that is, the optical total length of the optical lens, and f1 is the effective focal length of the first lens L1. When the above relational expression is satisfied, the optical lens 100 can have a larger field angle and a shorter overall length, which is favorable for the compact arrangement of the optical lens 100 and the realization of the miniaturized design of the optical lens 100; when f1 × tan (hfov)/TTL is less than 0.9, the refractive power provided by the first lens element L1 is insufficient, which is not favorable for the optical lens 100 to be miniaturized; when f1 star (hfov)/TTL >1.6, the field angle of the optical lens 100 is too large, which causes too large distortion of the peripheral field, distortion of the image periphery, and poor imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.5< f1/CT1< 8.0. Where f1 is the effective focal length of the first lens L1. When the above relation is satisfied, it is beneficial to adjust the refractive power of the first lens element L1 and compress the volume of the object-side end of the optical lens 100, so that the head of the optical lens 100 is miniaturized.

In some embodiments, the optical lens 100 satisfies the following relationship: 5< (CT1+ CT2+ CT3)/(T12+ T23) < 20; wherein CT2 is the thickness of the second lens element L2 on the optical axis O, CT3 is the thickness of the third lens element L3 on the optical axis O, T12 is the distance between the first lens element L1 and the second lens element L2 on the optical axis O, and T23 is the distance between the second lens element L2 and the third lens element L3 on the optical axis O. When the above relation is satisfied, a sufficient space is left for the first lens L1, the second lens L2, and the third lens L3 to be assembled, and collision between the first lens L1 and the second lens L2 or between the second lens L2 and the third lens L3 is avoided. When (CT1+ CT2+ CT3)/(T12+ T23) ≦ 5, it is not favorable to increase the depth of the head structure of the optical lens 100, and when (CT1+ CT2+ CT3)/(T12+ T23) ≧ 20, the thickness of the first lens L1 is too large, it is not favorable to compress the volume of the optical lens 100, resulting in that the aberration of the optical lens 100 is difficult to correct.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.4< T34/CT4< 1.0; t34 is the distance between the third lens element L3 and the fourth lens element L4 along the optical axis O, and CT4 is the thickness of the fourth lens element L4 along the optical axis O. When the above relation is satisfied, the third lens L3 and the fourth lens L4 can cooperate with each other to adjust the deflection angle of the light, which is helpful to increase the field angle and the image area of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0< f1/f34< 3.0; where f1 is the effective focal length of the first lens L1, and f34 is the combined focal length of the third lens L3 and the fourth lens L4. The third lens element L3 and the fourth lens element L4 satisfying the above relationship can make up for the deficiency of the light converging capability of the first lens element L1, enhance the light focusing capability of the first lens element L1, and reduce the sensitivity of the single lens element, on the basis, if the object-side surfaces of the third lens element L3 and the fourth lens element L4 are concave at the circumference, that is, the object-side surfaces of the third lens element L3 and the fourth lens element L4 are curved toward the object side at the circumference, which is beneficial to reducing the deflection angle of the light in the peripheral field of view, and further improving the field angle of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.3< ET4/CT4< 0.5; ET4 is the distance in the optical axis direction from the maximum effective half aperture of the object-side surface S7 of the fourth lens L4 to the maximum effective half aperture of the image-side surface S8 of the fourth lens L4, that is, ET4 is the edge thickness of the fourth lens L4, and CT4 is the thickness of the fourth lens L4 on the optical axis O. When the above relational expression is satisfied, the surface shape and thickness ratio of the fourth lens element L4 can be effectively controlled, and the distortion of the optical lens 100 can be balanced and corrected, thereby ensuring the imaging quality of the optical lens 100. When ET4/CT4<0.3, the edge thickness of the fourth lens L4 is too small, making molding of the fourth lens L4 difficult; when ET4/CT4>0.50, the difference between the edge thickness of the fourth lens element L4 and the thickness of the fourth lens element L4 on the optical axis O is too small, which tends to cause the surface shape of the fourth lens element L4 to be too smooth, and the optical lens 100 has insufficient correction space for aberration such as distortion, which affects the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: -6< f4/R9< -2.0; where f4 is the effective focal length of the fourth lens L4, and R9 is the radius of curvature of the image-side surface S8 of the fourth lens L4. The relationship between the effective focal length of the fourth lens L4 and the curvature radius of the image-side surface S8 of the fourth lens L4 is reasonably configured, so that the incident angle of light entering the photosensitive chip can be effectively controlled, the sensitivity of the fourth lens L4 can be reduced, the distortion aberration of the optical lens 100 is improved, the optical lens 100 has smaller optical distortion, and the imaging quality is improved. Meanwhile, the curvature radius of the object-side surface S7 of the fourth lens L4 is adjusted, so that the situation that large-angle light rays are totally reflected inside the fourth lens L4 can be avoided, and the influence of ghost images and stray light on imaging quality is reduced.

In some embodiments, the optical lens 100 satisfies the following relationship: -3.0< R10/f5< -0.3; where f5 is the effective focal length of the fifth lens L5, and R10 is the radius of curvature of the object-side surface S9 of the fifth lens L5. When the above relation is satisfied, the field angle of the optical lens 100 can be effectively enlarged, and simultaneously, the astigmatic aberration of the optical lens 100 can be favorably improved, and the imaging quality of the optical lens 100 can be improved. When R10/f5 is ≧ 0.3, the negative refractive power provided by the fifth lens element L5 is insufficient, resulting in an excessive spherical aberration of the optical lens 100. When the ratio R10/f5 is less than or equal to-3, the edge of the aperture of the fifth lens L5 is excessively bent, so that the stray light of the optical lens 100 is increased, and the imaging quality is affected.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.05< | SAG51|/| SAG52| < 0.65; the SAG51 is a distance from an intersection point of the object-side surface S9 of the fifth lens L5 and the optical axis O to the maximum effective semi-aperture of the object-side surface S9 of the fifth lens L5 in the direction of the optical axis O, and the SAG52 is a distance from an intersection point of the image-side surface S10 of the fifth lens L5 and the optical axis O to the maximum effective semi-aperture of the image-side surface S10 of the fifth lens L5 in the direction of the optical axis O. When the above relation is satisfied, the peripheral field aberration of the optical lens 100 is favorably corrected, and the imaging quality is satisfied, and at the same time, the fifth lens L5 has a more appropriate shape, which is favorable for manufacturing and molding the fifth lens L5, and the defect of poor molding is reduced. When SAG51/SAG52 is not less than 0.65, the surface of the image side surface S10 of the fifth lens L5 is excessively curved, which may result in poor molding of the fifth lens L5 and affect the manufacturing yield. When SAG51/SAG52 is less than or equal to 0.05, the object side S9 of the fifth lens L5 has a too smooth surface, and the refractive power of the off-axis field is insufficient, which is not favorable for correcting the distortion and the field curvature aberration of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5< R12/R13< 1.5; where R12 is a radius of curvature of the object-side surface S11 of the sixth lens L6, and R13 is a radius of curvature of the image-side surface S12 of the sixth lens L6. When the above relation is satisfied, it is favorable to adjust the surface shape and refractive power of the sixth lens element L6, correct the peripheral aberration of the optical lens system 100, and enable the sixth lens element L6 to have positive refractive power or negative refractive power, and when the sixth lens element L6 has positive refractive power, the back focal length of the optical lens system 100 can be adjusted, thereby further shortening the total length of the optical lens system 100; when the sixth lens element L6 has negative refractive power, the field angle of the optical lens 100 can be further increased, so that the optical lens 100 obtains a larger field of view.

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

First embodiment

A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, which are disposed in order from an object side to an image side along an optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has negative refractive power.

Furthermore, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region O; the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at their circumferences. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave, respectively, at a paraxial region O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are concave and convex, respectively, at the circumference. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave, respectively, at a paraxial region O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are concave and convex, respectively, at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex, respectively, at a paraxial region O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are concave and convex, respectively, at the circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave, respectively, at a paraxial region O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are concave and convex, respectively, at the circumference. The object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are convex and concave, respectively, at a paraxial region O; the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively, at the circumference.

Specifically, taking as an example the effective focal length f =2.66mm of the optical lens 100, half of the maximum field angle HFOV =51.0 ° of the optical lens 100, and the total optical length TTL =4.399mm of the optical lens 100, other parameters of the optical lens 100 are given by table 1 below. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller number of surfaces is the object side surface of the lens, and the surface with the larger number of surfaces is the image side surface of the lens, and for example, the

numbers

2 and 3 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface of the respective surface number at the paraxial region O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side to the image side of the last lens of the first lens L1 is the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the image side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the object side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the reference wavelength of the refractive index, abbe number, and effective focal length of each lens in table 1 is 587.5618 nm.

TABLE 1

In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1 through the sixth lens L6 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1 above); k is a conic coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the respective aspherical mirror surfaces S1-S12 in the first embodiment.

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 656.2725nm, 587.5618nm and 486.1227 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a graph of astigmatism of the optical lens 100 in the first embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.

Second embodiment

Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, which are disposed in this order from the object side to the image side along the optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the second embodiment, the refractive power of each lens element is different from that of each lens element in the first embodiment in that: the sixth lens element L6 has positive refractive power. The shapes of the object-side surface and the image-side surface of each lens of the optical lens 100 in the second embodiment at the paraxial region O and the circumference are the same as those of the optical lens 100 in the first embodiment, and therefore, the description thereof is omitted.

The second embodiment exemplifies effective focal length f =2.68mm of the optical lens 100, half of maximum field angle HFOV =50.8 ° of the optical lens 100, and total optical length TTL =4.546mm of the optical lens 100. The other parameters in the second embodiment are given in table 3 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 3 are all mm. And the reference wavelength of the refractive index, abbe number, and effective focal length of each lens in table 3 is 587.5618 nm.

TABLE 3

In the second embodiment, table 4 gives the high-order term coefficients that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 4

Referring to fig. 4, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 4, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Third embodiment

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, which are disposed in this order from the object side to the image side along the optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the third embodiment, the refractive power of each lens element is different from that of each lens element in the first embodiment in that: the sixth lens element L6 has positive refractive power. Meanwhile, in the third embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that: the object-side surface S3 and the image-side surface S4 of the second lens element L2 are both concave at the paraxial region O.

The third embodiment exemplifies effective focal length f =2.67mm of the optical lens 100, half of maximum field angle HFOV =51.0 ° of the optical lens 100, and total optical length TTL =4.645mm of the optical lens 100. The other parameters in the third embodiment are given in table 5 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 5 are mm. And the reference wavelength of the refractive index, abbe number, and effective focal length of each lens in table 5 is 587.5618 nm.

TABLE 5

In the third embodiment, table 6 gives the high-order term coefficients that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 6, as shown in the longitudinal spherical aberration diagram (a), the astigmatism diagram (B), and the distortion diagram (C) of fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fourth embodiment

Referring to fig. 7, fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, which are disposed in this order from the object side to the image side along the optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the fourth embodiment, the refractive power of each lens element is the same as that of each lens element in the first embodiment. In the fourth embodiment, the surface shape of each lens differs from that of the first embodiment in that: the object-side surface S3 and the image-side surface S4 of the second lens element L2 are both concave at the paraxial region O.

The fourth embodiment exemplifies effective focal length f =2.66mm of the optical lens 100, half of maximum field angle HFOV =51.3 ° of the optical lens 100, and total optical length TTL =4.537mm of the optical lens 100. The other parameters in the fourth embodiment are given in table 7 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. And the reference wavelength of the refractive index, abbe number, and effective focal length of each lens in table 7 is 587.5618 nm.

TABLE 7

In the fourth embodiment, table 8 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 8

Referring to fig. 8, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 8, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 8 (a), fig. 8 (B), and fig. 8 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fifth embodiment

Referring to fig. 9, fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, which are disposed in this order from the object side to the image side along the optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the fifth embodiment, the refractive power of each lens element is the same as that of each lens element in the first embodiment. Meanwhile, the face shape of each lens coincides with that of each lens in the first embodiment.

The fifth embodiment exemplifies that the effective focal length f =2.67mm of the optical lens 100, half of the maximum field angle HFOV =51.2 ° of the optical lens 100, and the total optical length TTL =4.504mm of the optical lens 100. The other parameters in the fifth embodiment are given in table 9 below, and the definitions of the parameters can be obtained from the description of the previous embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm. And the reference wavelength of the refractive index, abbe number, and effective focal length of each lens in table 9 is 587.5618 nm.

TABLE 9

In the fifth embodiment, table 10 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

Watch 10

Referring to fig. 10, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 10, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 10 (a), fig. 10 (B), and fig. 10 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Sixth embodiment

Referring to fig. 11, fig. 11 is a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, which are disposed in this order from the object side to the image side along the optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the sixth embodiment, the refractive power of each lens element differs from that of each lens element in the first embodiment in that: the sixth lens element L6 has positive refractive power. In the fourth embodiment, the surface shape of each lens differs from that of the first embodiment in that: the object-side surface S3 and the image-side surface S4 of the second lens element L2 are both concave at the paraxial region O.

The sixth embodiment exemplifies that the effective focal length f =2.50mm of the optical lens 100, half of the maximum field angle of the optical lens 100 HFOV =50.9 °, and the total optical length TTL =4.525mm of the optical lens 100. The other parameters in the sixth embodiment are given in table 11 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 11 are mm. And the reference wavelength of the refractive index, abbe number, and effective focal length of each lens in table 11 is 587.5618 nm.

TABLE 11

In the sixth embodiment, table 12 gives the high-order term coefficients that can be used for each aspherical mirror surface in the sixth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 12

Referring to fig. 12, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 12, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 12 (a), fig. 12 (B), and fig. 12 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Seventh embodiment

Referring to fig. 13, fig. 13 is a schematic structural diagram of an optical lens 100 according to a seventh embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter L7, which are disposed in this order from the object side to the image side along the optical axis O. For materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, reference may be made to the above-mentioned specific embodiments, and details are not repeated here.

Further, in the seventh embodiment, the refractive power of each lens element differs from that of each lens element in the first embodiment in that: the sixth lens element L6 has positive refractive power. In the seventh embodiment, however, the surface shape of each lens coincides with the surface shape of each lens in the first embodiment.

The seventh embodiment exemplifies that the effective focal length f =2.51mm of the optical lens 100, half of the maximum field angle HFOV =51.0 ° of the optical lens 100, and the total optical length TTL =4.298mm of the optical lens 100. The other parameters in the seventh embodiment are given in table 13 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 13 are mm. And the reference wavelength of the refractive index, abbe number, and effective focal length of each lens in table 13 is 587.5618 nm.

Watch 13

In the seventh embodiment, table 14 gives the high-order term coefficients that can be used for each aspherical mirror surface in the seventh embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 14

Referring to fig. 14, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 14, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 14 (a), fig. 14 (B), and fig. 14 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Referring to table 15, table 15 summarizes ratios of the relations in the first embodiment to the seventh embodiment of the present application.

Watch 15

Relation/embodiment	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment	Sixth embodiment	Seventh embodiment
								1.1<CT1/SD11<1.8	1.138	1.394	1.565	1.207	1.207	1.727	1.381
0.9<f1*tan(HFOV)/TTL<1.6	1.409	1.184	1.055	1.090	1.289	1.033	1.066
								50°<HFOV<55°	51.0°	50.8°	51.0°	51.3°	51.2°	50.9°	51.0°
0.3<ET4/CT4<0.5	0.360	0.409	0.483	0.349	0.373	0.396	0.401
								-3.0 <R10/f5<-0.3	-1.44	-0.696	-0.434	-2.051	-1.222	-0.578	-0.72
1.0<f1/f34<3.0	2.62	1.76	1.04	1.98	2.18	1.13	1.38
								5<(CT1+CT2+CT3)/(T12+T23)<20	9.33	15.63	17.86	6.05	6.88	17.95	13.47
-6 <f4/R9<-2.0	-2.618	-3.156	-5.724	-2.534	-2.585	-4.405	-3.767
								3.5<f1/CT1<8.0	7.723	5.488	4.411	5.671	6.671	4.000	4.947
0.5<R12/R13<1.5	1.296	1.107	0.927	1.214	1.293	0.935	1.045
								0.4<T34/CT4<1.0	0.596	0.565	0.905	0.415	0.460	0.599	0.512
0.05<\|SAG51\|/\|SAG52\|<0.65	0.38	0.065	0.558	0.142	0.56	0.412	0.255

Referring to fig. 15, the present application further discloses a camera module, where the camera module 200 includes a photo sensor 201 and the optical lens 100, and the photo sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 may be configured to receive a light signal of a subject and project the light signal to the light sensing chip 201, and the light sensing chip 201 may be configured to convert the light signal corresponding to the subject into an image signal. It can be understood that the camera module 200 having the optical lens 100 can achieve a miniaturized design of the optical lens 100 while satisfying the high imaging quality of the optical lens 100. When the optical lens 100 is packaged under a screen of an electronic device, the size of an opening of the screen of the electronic device can be reduced.

Referring to fig. 16, the present application further discloses an electronic device, wherein the electronic device 300 includes a housing 301 and the camera module 200, and the camera module 200 is disposed on the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the electronic apparatus 300 can achieve a compact design of the optical lens 100 while satisfying high imaging quality of the optical lens 100. When the optical lens 100 is packaged under a screen of an electronic device (e.g., a mobile phone), the size of an opening of the screen of the electronic device can be reduced.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An optical lens barrel comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens:

the lens with refractive power of the optical lens is the six lenses;

the optical lens satisfies the following relation:

1.1<CT1/SD11<1.8；

2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 50 ° < HFOV <55 °, and 0.9< f1 star (HFOV)/TTL < 1.6;

wherein, HFOV is half of the maximum field angle of the optical lens, TTL is the distance on the optical axis from the object-side surface of the first lens to the image plane of the optical lens, and f1 is the effective focal length of the first lens.

3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 3.5< f1/CT1< 8.0;

wherein f1 is the effective focal length of the first lens.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 5< (CT1+ CT2+ CT3)/(T12+ T23) < 20; or, 0.4< T34/CT4< 1.0;

wherein, CT2 is the second lens element in the thickness on the optical axis, CT3 is the third lens element in the thickness on the optical axis, CT4 is the fourth lens element in the thickness on the optical axis, T12 is the first lens element and the second lens element in the interval on the optical axis, T23 is the second lens element and the third lens element in the interval on the optical axis, T34 is the third lens element and the fourth lens element in the interval on the optical axis.

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.0< f1/f34< 3.0;

wherein f1 is an effective focal length of the first lens, and f34 is a combined focal length of the third lens and the fourth lens.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.3< ET4/CT4< 0.5;

ET4 is a distance from a maximum effective half aperture of an object-side surface of the fourth lens element to a maximum effective half aperture of an image-side surface of the fourth lens element along the optical axis, and CT4 is a thickness of the fourth lens element along the optical axis.

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: -6< f4/R9< -2.0; or-3.0 < R10/f5< -0.3;

wherein f4 is an effective focal length of the fourth lens element, R9 is a radius of curvature of an image-side surface of the fourth lens element at the optical axis, f5 is an effective focal length of the fifth lens element, and R10 is a radius of curvature of an object-side surface of the fifth lens element at the optical axis.

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.05< | SAG51|/| SAG52| < 0.65;

SAG51 is a distance from an intersection point of an object side surface of the fifth lens and the optical axis to a maximum effective semi-aperture of the object side surface of the fifth lens in the optical axis direction, and SAG52 is a distance from an intersection point of an image side surface of the fifth lens and the optical axis to a maximum effective semi-aperture of the image side surface of the fifth lens in the optical axis direction.

9. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.5< R12/R13< 1.5;

wherein R12 is a radius of curvature of an object-side surface of the sixth lens element at the optical axis, and R13 is a radius of curvature of an image-side surface of the sixth lens element at the optical axis.

10. A camera module, comprising a photo sensor chip and the optical lens of any one of claims 1-9, wherein the photo sensor chip is disposed on an image side of the optical lens.

11. An electronic device, comprising a housing and the camera module of claim 10, wherein the camera module is disposed in the housing.