CN112099190B

CN112099190B - Optical lens, camera module and electronic equipment

Info

Publication number: CN112099190B
Application number: CN202010958395.1A
Authority: CN
Inventors: 蔡雄宇; 兰宾利; 周芮
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2022-06-28
Anticipated expiration: 2040-09-14
Also published as: CN112099190A

Abstract

An optical lens, make a video recording module and electronic equipment, optical lens include along the first lens that the optical axis set gradually from thing side to image side, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, the refractive power of first lens to sixth lens is negative in proper order, positive, negative, positive, the image side of fourth lens is the convex surface in passing optical axis department, the object side of fifth lens is the concave surface in passing optical axis department, the object side of fifth lens and the image side veneer of fourth lens form cemented lens, optical lens satisfies: f456/f < 4.2 and 3.0. By adopting the scheme of the embodiment, the power distribution of the fourth lens, the fifth lens and the sixth lens can be reasonably controlled, so that on one hand, the height of incident rays of the light beams emitted out of the optical lens is favorably controlled, and the high-level aberration of the optical lens and the outer diameter of the lens are reduced; on the other hand, the influence of the field curvature generated by the front lens group on the resolving power can be corrected, so that the resolution and the depth of field of the optical lens are favorably improved, and the imaging effect is improved.

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 development of the vehicle-mounted industry, the technical requirements on automobile driving auxiliary cameras such as forward-looking cameras, side-looking cameras, automatic cruising cameras, automobile data recorders and automobile backing images are higher and higher. Look sideways at the on-vehicle camera of camera for being used for monitoring car left and right sides road conditions, it can make the driver can be very audio-visual in the dead zone to the car left and right sides in the car is traveling, the pedestrian discerns and monitors, realize that the car is turning through special place (like crossroad, the roadblock, parking area etc.), when turning round, open the camera of looking sideways at any time, make the judgement to driving environment, and feedback car central system makes the emergence that the driving accident was avoided to the exact instruction, look sideways at the camera simultaneously and also can realize road conditions monitoring function, provide the foundation for law enforcement personnel to the judgement of all kinds of traffic accidents and vehicle violations.

However, in the related art, the resolution of the test camera is low, the depth of field is small, the presentation of the long-distance details and the clear imaging of the large-angle range cannot be simultaneously satisfied, so that the details of the long-distance shooting cannot be accurately judged in real time to make an early warning or avoid obstacles in the large-angle range, and further, the driving risk may be caused.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can effectively improve the resolution and enlarge the field depth range.

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

the first lens element has negative refractive power;

the second lens element with positive refractive power;

the third lens element with positive refractive power;

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

the fifth lens element with negative refractive power has a concave object-side surface at paraxial region, and the object-side surface of the fifth lens element is cemented with the image-side surface of the fourth lens element to form a cemented lens;

the sixth lens element with positive refractive power;

the optical lens satisfies the following relationship: f456/f is more than 3.0 and less than 4.2;

wherein f456 is a combined focal length of the fourth lens, the fifth lens and the sixth lens, and f is a focal length of the optical lens.

In the optical lens provided by the embodiment, six lens elements are adopted, the number of the lens elements is moderate, and the fourth lens element and the fifth lens element are glued, so that the total length of the optical lens is short, and the miniaturization design is favorably realized. In addition, when each lens element in the optical lens has the refractive power, the convex-concave design of the object side surface and the image side surface and satisfies the relation of 3.0 & ltf 456/f & lt 4.2, the power distribution of the fourth lens element, the fifth lens element and the sixth lens element group can be reasonably controlled, on one hand, the height of incident rays of the light beams exiting the optical lens is favorably controlled, so that the high-level aberration of the optical lens and the outer diameter of the lens element are reduced; on the other hand, the influence of curvature of field generated by the front lens group (namely the combined lens of the first lens, the second lens and the third lens) on the resolving power can be corrected, so that the resolution and the depth of field of the optical lens can be improved, and the imaging effect can be improved.

As an alternative implementation, in an embodiment of the first aspect of the invention, the optical lens satisfies the following relation: -8 < f12/f 2< -1;

wherein f12 is the combined focal length of the first lens and the second lens, and f2 is the focal length of the second lens.

The negative focal power is provided for the optical lens by controlling the combined focal length of the first lens and the second lens, large-angle light beams can be favorably emitted into the optical lens, the edge aberration generated when the large-angle light beams are emitted into the optical system is favorably improved by arranging the second lens with positive bending force in a lens group formed by combining the first lens and the second lens, and the edge image resolving power of the optical lens is favorably improved.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 4< Rs4/f2< 16;

wherein Rs4 is a radius of curvature of an image side surface of the second lens at an optical axis, and f2 is a focal length of the second lens.

The curvature radius of the image side surface of the second lens at the optical axis is reasonably set, so that the second lens can reduce the assembly eccentricity sensitivity of the second lens under the condition of realizing the correction of the aberration by positive bending force, the assembly yield of the lenses is improved, and the production cost is reduced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -8mm < f4 f5/(CT4-CT5) < -3 mm;

wherein f4 is a focal length of the fourth lens element, f5 is a focal length of the fifth lens element, CT4 is a thickness of the fourth lens element on an optical axis, CT5 is a thickness of the fifth lens element on the optical axis, and a value of CT5 is smaller than a value of CT 4.

Because the focal length of the optical lens can be influenced by the change of the central thicknesses of the fourth lens and the fifth lens, the sensitivity of the optical lens can be reduced by adopting a thin and thick cemented lens combination, the assembly yield of the fourth lens and the fifth lens can be improved, and the production cost can be further reduced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2< f/SAGs9< 6;

wherein SAGs9 is the rise of the fourth lens at the maximum optically effective radius of the image side surface, and f is the focal length of the optical lens.

Through the size of the rise of the gluing surface of the fourth lens and the fifth lens which are reasonably arranged, the difficulty of the gluing process can be effectively reduced while the aberration of the optical lens is corrected to improve the resolving power, so that the tolerance range of relative eccentricity of the gluing process of the two lenses is reduced, the yield of the gluing process is improved, the yield of lens assembly is improved, and the production cost is reduced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -4< Rs12/f6< -2;

wherein Rs12 is a curvature radius of an image side surface of the sixth lens at an optical axis, and f6 is a focal length of the sixth lens.

The size of the curvature radius value of the image side surface of the sixth lens at the optical axis is reasonably set, so that the bending force range of the sixth lens can be reasonably adjusted, the angle of the light beam transmitted to the imaging surface through the optical lens is favorably reduced, the astigmatism of the optical lens is favorably corrected, and the resolving power is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 8< (Rs6+ Rs7)/(Rs6-Rs7) < 16;

wherein Rs6 is a radius of curvature of an object-side surface of the third lens element at an optical axis, and Rs7 is a radius of curvature of an image-side surface of the third lens element at the optical axis.

The object side surface and the image side surface of the third lens are reasonably arranged at the curvature radius of the optical axis, so that the bending degree of the third lens is controlled, the risk of ghost image generation is reduced, and the system resolution is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.7< TTL/Σ CT < 2.2;

wherein, TTL is the total length of the optical lens, that is, TTL is the distance from the object-side surface of the first lens element to the imaging surface of the optical lens on the optical axis. The Σ CT is the thickness of each lens of the optical lens on the optical axis. When the relational expression is satisfied, the relation of the central thickness of each lens can be reasonably matched, and the miniaturization and lightweight design of the optical lens are facilitated.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.5<2 × Imgh/EPD < 4.2;

wherein Imgh is half of the image height corresponding to the maximum field angle of the optical lens, and EPD is the entrance pupil diameter of the optical lens. When the relation is satisfied, the improvement of the image surface brightness of the large target surface imaging system is favorably ensured.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens further includes a stop, and the stop is located between the image side surface of the second lens and the object side surface of the third lens. The diaphragm is arranged between the image side surface of the second lens and the object side surface of the third lens, so that the size of the imaging range of the light beam from the second lens to the third lens can be effectively limited.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens further includes an infrared filter and a protective glass, the infrared filter is located between the image side surface of the sixth lens and the imaging surface of the optical lens, and the protective glass is located between the infrared filter and the imaging surface of the optical lens.

In order to ensure the imaging definition of the shot object on the image side, the infrared light in the light passing through the fifth lens can be effectively filtered through the arrangement of the infrared filter, so that the imaging definition of the shot object on the image side is ensured, and the imaging quality is improved. In addition, through the setting of protective glass, can effectively protect this optical lens.

In a second aspect, the present invention discloses a camera module, which includes an image sensor and the optical lens of the first aspect, wherein the image sensor is disposed on an image side of the optical lens.

The camera module with the optical lens meets the requirement of miniaturization design, and is also favorable for improving the resolution and the depth of field range of the optical lens and improving the imaging effect.

In a third aspect, the present invention further discloses an electronic device, where the electronic device includes a housing and the camera module according to the second aspect, and the camera module is disposed on the housing. The electronic equipment with the camera module can be favorable for improving the resolution and the depth of field range of the optical lens and improving the imaging effect.

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

according to the optical lens, the camera module and the electronic equipment provided by the embodiment of the invention, the overall length of the optical lens is reduced through the six-piece type lens, and the miniaturization design is favorably realized. In addition, the optical power distribution of the fourth lens group, the fifth lens group and the sixth lens group is reasonably controlled, so that on one hand, the height of incident rays of a ray bundle which are emitted out of the optical lens is favorably controlled, and the high-level aberration of the optical lens and the outer diameter of a lens are reduced; on the other hand, the influence of curvature of field generated by the front lens group (namely the combined lens of the first lens, the second lens and the third lens) on the resolving power can be corrected, so that the resolution and the depth of field range are effectively improved, and the imaging definition is improved.

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 the camera module disclosed in the present application;

fig. 14 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to 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 orientations or positional relationships based on the orientations or positional relationships 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 in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meanings of these terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

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 according to specific situations by those of ordinary skill in the art.

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 examples and 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 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 finally forms an image on the image plane 101 of the optical lens 100. The first lens element L1 with negative refractive power includes a first object-side surface L10 and a first image-side surface L12, and the second lens element L2 with positive refractive power includes a second object-side surface L20 and a second image-side surface L22. The third lens element L3 with positive refractive power includes a third object-side surface L30 and a third image-side surface L32. The fourth lens element L4 with positive refractive power includes a fourth object-side surface L40 and a fourth image-side surface L42. The fifth lens element L5 with negative refractive power includes a fifth object-side surface L50 and a fifth image-side surface L52, and the sixth lens element L6 with positive refractive power includes a sixth object-side surface L60 and a sixth image-side surface L62. In the paraxial region O, the surface shapes of the object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, and the sixth lens element L6 are as follows:

The first object-side surface L10 can be a plane, the first image-side surface L12 can be a concave surface, the second image-side surface L22 can be a concave surface, the second object-side surface L20 can be a convex surface, the third object-side surface L30 can be a concave surface, the third image-side surface L32 can be a convex surface, the fourth object-side surface L40 can be a convex surface, the fourth image-side surface L42 can be a convex surface, the fifth object-side surface L50 can be a concave surface, the fifth image-side surface L52 can be a concave surface, the sixth object-side surface L60 can be a convex surface, and the sixth image-side surface L62 can be a convex surface.

In some embodiments, the sixth object-side surface L60 and the sixth image-side surface L62 may both be aspheric.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be aspheric lenses, spherical lenses or free-form lenses. Illustratively, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all spherical.

In an alternative embodiment, 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 all be made of plastic, and the plastic lens can effectively reduce the weight of the optical lens 100 and reduce the production cost thereof.

In another alternative embodiment, 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 all be made of glass, and the glass lens may have better optical performance.

In another alternative embodiment, the first lens element L1 can be made of glass and the other lens elements can be made of plastic, in which case, the first lens element L1 closest to the object side can better withstand the environmental temperature at the object side, and the production cost of the optical lens 100 can be reduced because the other lens elements are made of plastic.

It should be understood that the above materials for 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 are not limited in this embodiment as long as the optical performance requirements can be met.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop and/or a field stop, which may be disposed between an object plane and an image plane of the optical lens 100. Illustratively, the stop 102 may be located between the second image-side surface L22 of the second lens L2 and the third object-side surface L30 of the third lens L3, so as to limit the light range of the light beam incident from the second lens L2 to the third lens L3.

It is understood that, in other embodiments, the stop 102 may also be located between the object plane of the optical lens 100 and the first object-side surface L10 of the first lens L1, between the first image-side surface L12 of the first lens L1 and the second object-side surface L20 of the second lens L2, between the third image-side surface L32 of the third lens L3 and the fourth object-side surface L40 of the fourth lens L4, between the fourth image-side surface L42 of the fourth lens L4 and the fifth object-side surface L50 of the fifth lens L5, between the fifth image-side surface L52 of the fifth lens L5 and the sixth object-side surface L60 of the sixth lens L6, or between the sixth image-side surface L62 of the sixth lens and the image plane of the optical lens 100. Further, a stop may be provided on any one of the first object-side surface L10, the second object-side surface L20, the third object-side surface L30, the fourth object-side surface L40, the fifth object-side surface L50, the sixth object-side surface L60, the first image-side surface L12, the second image-side surface L22, the third image-side surface L32, the fourth image-side surface L42, the fifth image-side surface L52, and the sixth image-side surface L62.

In some embodiments, in order to improve the imaging quality, the optical lens 100 further includes an infrared filter 70 and a protective glass 80, the infrared filter 70 is disposed between the sixth image-side face L62 of the sixth lens L6 and the image side of the optical lens 100, and the protective glass 80 is disposed between the infrared filter 70 and the image side of the optical lens 100. By adopting the arrangement of the infrared filter 70, the infrared light passing through the sixth lens L6 can be effectively filtered, so that the imaging definition of the object on the image side is ensured, and the imaging quality is improved. The protective glass 80 is disposed to effectively protect the lenses of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: f456/f is more than 3.0 and less than 4.2;

wherein f456 is a combined focal length of the fourth lens, the fifth lens and the sixth lens, and f is a focal length of the optical lens. Alternatively, the ratio of f456 to f may be approximately 3.13, 3.15, 3.17, 3.57, 3.65, etc.

In the above relation, by controlling the values of f456 and f and simultaneously controlling the ratio of the two, the distribution of the focal power of the combined lens of the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be reasonably controlled, thereby being beneficial to controlling the height of the incident light ray of the light beam exiting the optical lens, so as to reduce the high-level aberration of the optical lens 100 and the outer diameter of the lens. Further, the influence of curvature of field generated by the front lens group (i.e., the combined lens of the first lens L1, the second lens L2, and the third lens L3) on the resolving power can also be corrected.

Further, the optical lens 100 satisfies the following relationship: -8 < f12/f 2< -1; wherein f12 is the combined focal length of the first lens and the second lens, and f2 is the focal length of the second lens. Alternatively, the ratio of f12 to f2 can be-21.85, -2.06, -2.11, -2.3, -5.65, -7.09, etc.

It can be understood that, by controlling the combined focal length of the first lens L1 and the second lens L2 to provide negative power for the optical lens, it is beneficial to inject a large-angle light beam into the optical lens, and by arranging the second lens L2 with positive bending power in the lens group formed by combining the first lens L1 and the second lens L2, it is beneficial to improve the edge image resolving power of the optical lens compared with the edge aberration generated by injecting a positive large-angle light beam into the optical system.

When the ratio of f12 to f2 exceeds the upper limit of the above relation, the combined focal length of the first lens L1 and the second lens L2 is too short, which easily causes the negative bending force of the formed combined lens to be too strong, and thus, the relatively serious edge aberration is easily generated. If the ratio of f12 to f2 exceeds the lower limit of the above relational expression, the resultant composite lens tends to have insufficient focal length bending force, which is disadvantageous in widening the angle.

In some embodiments, the optical lens 100 satisfies the following relationship: 4< Rs4/f2< 16; wherein Rs4 is a curvature radius of the image side surface of the second lens at the optical axis, and f2 is a focal length of the second lens. Illustratively, Rs4 and f2 may take on values of 4.99, 5.43, 11.64, 13.54, 16.63, and so on.

When the relation is satisfied, the curvature radius of the image side surface of the second lens at the optical axis can be reasonably set, so that the assembly eccentricity sensitivity of the second lens can be reduced under the condition that positive bending force is realized to correct aberration, the assembly yield of the lenses is improved, and the production cost is reduced.

If the ratio of Rs4 to f2 exceeds the upper limit of the above relation, the closer the second image side surface L22 of the second lens L2 is to the plane, the more the rear plane components (i.e. the third lens, the fourth lens, etc. behind the second lens) are reflected to each other, and the generation of ghost image is increased. If the ratio of Rs4 to f2 exceeds the lower limit of the above relationship, the second image side of the second lens is too curved, which is not favorable for reducing the assembly tolerance sensitivity of the second lens L2, thereby reducing the production yield.

Further, the optical lens 100 satisfies the following relation: -8mm < f4 f5/(CT4-CT5) < -3 mm. Wherein f4 is the focal length of the fourth lens element, CT5 is the thickness of the fifth lens element on the optical axis, and the value of CT5 is smaller than that of CT 4. The ratio of the above relationship f4 x f5/(CT4-CT5) may be exemplified by-4.58 mm, -4.73mm, -7.16mm, -7.43mm, -7.46mm, -7.54mm, and the like.

Because the focal length of the optical lens can be influenced by the change of the central thicknesses of the fourth lens and the fifth lens, the sensitivity of the optical lens can be reduced by adopting a thin and thick cemented lens combination, the assembly yield of the fourth lens and the fifth lens can be improved, and the production cost can be further reduced. If the upper limit of the above relation is exceeded, the refractive power of the combined focal length of the fourth lens element and the fifth lens element may be too strong, which is likely to generate larger edge aberration and chromatic aberration, and is not favorable for improving the resolution performance of the lens module 100. If the difference exceeds the lower limit of the above relation, the optical performance of the optical lens can be met, but the difference between the central thicknesses of the fifth lens and the sixth lens is too large, which is not favorable for the aberration correction of the lens module.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< f/SAGs9< 6; wherein SAGs9 is the rise of the fourth lens at the maximum optically effective radius of the image side surface, and f is the focal length of the optical lens. Alternatively, f/SAGs9 may be 3.464, 3.627, 4.01, 4.018, 4.587, 4.593, and the like.

Through the size of the rise of the gluing surface of the fourth lens and the fifth lens which are reasonably arranged, the difficulty of the gluing process can be effectively reduced while the aberration of the optical lens is corrected to improve the resolving power, so that the tolerance range of relative eccentricity of the gluing process of the two lenses is reduced, the yield of the gluing process is improved, the yield of lens assembly is improved, and the production cost is reduced. If the upper limit of the above relation is exceeded, the correction of the aberration of the optical lens is not facilitated, and if the lower limit of the above relation is exceeded, the sagittal height of the fourth lens and the fifth lens may be too large, which may cause the cemented surface to be too curved, which is not conducive to the cementing process of the fourth lens and the fifth lens.

In some embodiments, the optical lens 100 satisfies the following relationship: -4< Rs12/f6< -2. Wherein Rs12 is a curvature radius of an image side surface of the sixth lens at an optical axis, and f6 is a focal length of the sixth lens. Alternatively, Rs12/f6 may be-2.854, -2.885, -2.904, -2.927, -2.974, -3.019, and the like.

Further, the optical lens 100 further satisfies the following relation: 8< (Rs6+ Rs7)/(Rs6-Rs7) < 16. Wherein Rs6 is a radius of curvature of an object-side surface of the third lens element at an optical axis, and Rs7 is a radius of curvature of an image-side surface of the third lens element at the optical axis. Alternatively, the (Rs6+ Rs7)/(Rs6-Rs7) may be 9.8, 10.51, 13.2, 14.15, 14.69, 15.17, etc.

Further, the optical lens 100 also satisfies the following relation: 1.7< TTL/Σ CT < 2.2. Wherein, TTL is the total length of the optical lens system, that is, TTL is the distance from the object-side surface of the first lens element to the imaging surface of the optical lens system on the optical axis. The Σ CT is the thickness of each lens of the optical lens on the optical axis. Optionally, TTL/Σ CT may take on values of 1.878, 1.885, 1.903, 1.924, etc.

When the relational expression is satisfied, the relation of the central thickness of each lens can be reasonably matched, and the miniaturization and lightweight design of the optical lens are facilitated. If the upper limit of the above relational expression is exceeded, the total length of the optical lens becomes too long, which is disadvantageous for the compact design of the optical lens. If the lower limit of the above relation is exceeded, the sum of the total lenses of the optical lens may become too large, which may result in an excessively high density of glass lenses, which is disadvantageous for a lightweight design of the optical lens.

Further, the optical lens 100 further satisfies the following relationship: 3.5<2 × Imgh/EPD < 4.2. Wherein Imgh is half of the image height corresponding to the maximum field angle of the optical lens, and EPD is the entrance pupil diameter of the optical lens. Alternatively, the ratio of 2 × Imgh/EPD may be 3.786, 3.787, 3.796, etc.

When the relation is satisfied, the improvement of the image surface brightness of the large target surface imaging system is favorably ensured. If the upper limit of the relational expression is exceeded, the entrance pupil diameter of the optical lens is small, so that the width of a light beam incident from the optical lens is reduced, which is not beneficial to improving the image surface brightness of the optical lens. If the area exceeds the lower limit of the relational expression, the area of the imaging surface of the optical lens is smaller, which is not beneficial to enlarging the field range of the optical lens.

The optical lens 100 of the present embodiment will be described in detail 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 first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, an infrared filter 70, and a protective glass 80, which are sequentially disposed from an object side to an image side along an optical axis O.

The first lens element L1 with negative refractive power includes a first object-side surface L10 and a first image-side surface L12, and the second lens element L2 with positive refractive power includes a second object-side surface L20 and a second image-side surface L22. The third lens element L3 with positive refractive power includes a third object-side surface L30 and a third image-side surface L32. The fourth lens element L4 with positive refractive power includes a fourth object-side surface L40 and a fourth image-side surface L42. The fifth lens element L5 with negative refractive power includes a fifth object-side surface L50 and a fifth image-side surface L52. The sixth lens element L6 with positive refractive power includes a sixth object-side surface L60 and a sixth image-side surface L62.

Further, at the paraxial region O, the surface shapes of the object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, and the sixth lens element L6 are as follows:

the first object-side surface L10 can be a plane surface, and the first image-side surface L12 can be a concave surface. The second image-side surface L22 is concave, the second object-side surface L20 is convex, the third object-side surface L30 is concave, the third image-side surface L32 is convex, the fourth object-side surface L40 is convex, the fourth image-side surface L42 is convex, the fifth object-side surface L50 is concave, the fifth image-side surface L52 is concave, the sixth object-side surface L60 is convex, and the sixth image-side surface L62 is convex.

Further, the first object-side surface L10, the first image-side surface L12, the second object-side surface L20, the second image-side surface L22, the third object-side surface L30, the third image-side surface L32, the fourth object-side surface L40, the fourth image-side surface L42, the fifth object-side surface L50, and the fifth image-side surface L52 are all spherical surfaces. The sixth object-side surface L60 and the sixth image-side surface L62 are aspheric. The formula for the aspheric surface can be referred to as follows:

wherein, X is the distance from any point on the aspheric surface to the plane tangent to the aspheric surface vertex, Y is the vertical distance between any point on the aspheric surface curve and the optical axis, R is the curvature radius of the aspheric surface vertex, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface type formula.

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 are all made of glass, so that the imaging definition of the optical lens 100 is improved.

In the first embodiment, the ratios of the relations satisfied by the optical lens 100, etc. can be seen in table 1 below:

TABLE 1

Relation formula	Ratio of
		f456/f	3.15
f12/f2	-2.06
		Rs4/f2	11.64
f4*f5/(CT4-CT5)	-7.54mm
		f/SAGs9	4.593
Rs12/f6	-2.854
		(Rs6+Rs7)/(Rs6-Rs7)	14.15
TTL/ΣCT	1.885
		2*Imgh/EPD	3.796

Specifically, taking the example that the focal length f of the optical lens 100 is 3.48mm, the field angle FOV of the optical lens 100 is 119.1 °, and the f-number FNO is 2.0, the other parameters of the optical lens 100 are respectively given in table 2 and table 3 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 2. In the same lens, the surface with the smaller surface number is the object side surface of the lens, the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 respectively correspond to the first object side surface L10 and the first image side surface L12 of the first lens L1, and so on. The radius Y in table 2 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter list of the first lens element L1 is the thickness (center thickness) of the lens element along the optical axis O, and the second value is the distance from the image-side surface of the lens element to the object-side surface of the subsequent lens element along the optical axis O. The numerical value of the stop in the "thickness" parameter column is the distance on the optical axis O from the stop to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens and the optical axis O), the direction from the object-side surface of the first lens L1 to the image-side surface of the last lens is defined as the positive direction of the optical axis O, when the value is negative, it indicates that the stop is disposed on the right side of the vertex of the object-side surface of the subsequent lens, and if the thickness of the stop is a positive value, the stop is disposed on the left side of the vertex of the object-side surface of the subsequent lens. Table 3 is a table of relevant parameters of the aspheric surface of the sixth lens element L6 in table 2, where k is a cone coefficient and Ai is an aspheric coefficient of the ith order.

In table 2, the units of the Y radius, thickness, and focal length are all mm, and the refractive index, abbe number, and focal length of each lens are numerical values at a reference wavelength.

TABLE 2

TABLE 3

Referring to fig. 2(a), fig. 2(a) shows a longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at 435.8343nm, 486.1327nm, 546.0740nm, 587.5618nm, 656.2725 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 diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 2(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2(C), fig. 2(C) is a graph illustrating a distortion curve of the optical lens 100 at a wavelength of 546.0740nm in the first embodiment. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from fig. 2(C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.0740 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 third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, an infrared filter 70, and a cover glass 80, which are provided in order from the object side to the image side along an optical axis O.

It is understood that the refractive powers of the lenses of the optical lens system 100 in the second embodiment, the shapes of the object-side surface and the image-side surface of each lens are the same as those shown in the optical lens system 100 in the first embodiment, and therefore, the description thereof is omitted.

In the second embodiment, the ratio of each relation satisfied by the optical lens 100 can be seen from the following table 4:

TABLE 4

Specifically, taking the example that the focal length f of the optical lens 100 is 3.49mm, the field angle FOV of the optical lens 100 is 118.7 °, and the f-number FNO is 2.0, the other parameters of the optical lens 100 are respectively given in table 5 and table 6 below.

In table 5, the units of the Y radius, thickness, and focal length are all mm, and the refractive index, abbe number, and focal length of each lens are numerical values at a reference wavelength.

TABLE 5

TABLE 6

Further, referring to fig. 4(a), a longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 435.8343nm, 486.1327nm, 546.0740nm, 587.5618nm, and 656.2725nm is shown. In fig. 4(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. 4(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. 4(B), fig. 4(B) is a diagram illustrating astigmatism of the optical lens 100 at a wavelength of 546.0740nm in the first embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 4(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 4(C), fig. 4(C) is a graph illustrating a distortion curve of the optical lens 100 at a wavelength of 546.0740nm in the second embodiment. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from fig. 4(C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.0740 nm.

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 third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, an infrared filter 70, and a cover glass 80, which are disposed in this order from the object side to the image side along the optical axis O.

It is understood that the refractive powers of the lenses of the optical lens system 100 in the third embodiment, the shapes of the object-side surface and the image-side surface of each lens are the same as those shown in the optical lens system 100 in the first embodiment, and therefore, the description thereof is omitted.

In the third embodiment, the ratio of the relations satisfied by the optical lens 100 can be seen from the following table 7:

TABLE 7

Relation formula	Ratio of
		f456/f	3.17
f12/f2	-2.11
		Rs4/f2	5.43
f4*f5/(CT4-CT5)	-7.16mm
		f/SAGs9	4.018
Rs12/f6	-3.019
		(Rs6+Rs7)/(Rs6-Rs7)	13.20
TTL/ΣCT	1.903
		2*Imgh/EPD	3.786

Specifically, taking an example that the focal length f of the optical lens 100 is 3.49mm, the field angle FOV of the optical lens 100 is 118.6 °, and the f-number FNO is 2.0, the other parameters of the optical lens 100 are respectively given in table 8 and table 9 below.

In table 8, the units of the Y radius, thickness, and focal length are all mm, and the refractive index, abbe number, and focal length of each lens are numerical values at a reference wavelength.

TABLE 8

TABLE 9

Further, referring to fig. 6(a), a longitudinal spherical aberration curve of the optical lens 100 in the third embodiment at wavelengths of 435.8343nm, 486.1327nm, 546.0740nm, 587.5618nm, and 656.2725nm is shown. In fig. 6(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. 6(a), the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 6(B), fig. 6(B) is a diagram of astigmatism of light of the optical lens 100 in the third embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 6(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 6(C), fig. 6(C) is a distortion curve diagram of the astigmatism of the optical lens 100 at a wavelength of 546.0740nm in the third embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 6(C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.0740 nm.

Fourth embodiment

Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present disclosure. 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, a sixth lens L6, an infrared filter 70, and a cover glass 80, which are disposed in this order from the object side to the image side along the optical axis O.

It is understood that the refractive powers of the lenses of the optical lens system 100 in the fourth embodiment, the shapes of the object-side surface and the image-side surface of each lens are the same as those shown in the optical lens system 100 in the first embodiment, and therefore, the description thereof is omitted here.

In the fourth embodiment, the ratio of the relations satisfied by the optical lens 100 can be seen from the following table 10:

watch 10

Relation formula	Ratio of
		f456/f	3.13
f12/f2	-1.85
		Rs4/f2	4.99
f4*f5/(CT4-CT5)	-7.46mm
		f/SAGs9	4.010
Rs12/f6	-2.974
		(Rs6+Rs7)/(Rs6-Rs7)	15.17
TTL/ΣCT	1.924
		2*Imgh/EPD	3.786

Specifically, taking the example that the focal length f of the optical lens 100 is 3.49mm, the field angle FOV of the optical lens 100 is 118.6 °, and the f-number FNO is 2.0, the other parameters of the optical lens 100 are given in the following table 11 and table 12, respectively.

In table 11, the units of the radius Y, the thickness, and the focal length are all mm, and the refractive index, the abbe number, and the focal length of each lens are numerical values at a reference wavelength.

TABLE 11

TABLE 12

Further, referring to fig. 8(a), a longitudinal spherical aberration curve of the optical lens 100 in the fourth embodiment at wavelengths of 435.8343nm, 486.1327nm, 546.0740nm, 587.5618nm, and 656.2725nm is shown. In fig. 8(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. 8(a), the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 8(B), fig. 8(B) is a diagram of astigmatism of light of the optical lens 100 in the fourth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 8(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 8(C), fig. 8(C) is a distortion curve diagram of the optical lens 100 in the fourth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 8(C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.0740 nm.

Fifth embodiment

Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present disclosure. 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, a sixth lens L6, an infrared filter 70, and a cover glass 80, which are disposed in this order from the object side to the image side along the optical axis O.

It is understood that the refractive powers of the lenses of the optical lens system 100 in the fifth embodiment, the shapes of the object-side surface and the image-side surface of each lens are the same as those shown in the optical lens system 100 in the first embodiment, and therefore, the description thereof is omitted here.

In the fifth embodiment, the ratio of the relations satisfied by the optical lens 100 can be seen from the following table 13:

watch 13

Specifically, taking the example that the focal length f of the optical lens 100 is 3.49mm, the field angle FOV of the optical lens 100 is 118.7 °, and the f-number FNO is 2.0, the other parameters of the optical lens 100 are given in the following table 14 and table 15, respectively.

In table 14, the units of the Y radius, thickness, and focal length are all mm, and the refractive index, abbe number, and focal length of each lens are numerical values at a reference wavelength.

TABLE 14

Watch 15

Further, referring to fig. 10(a), a longitudinal spherical aberration curve of the optical lens 100 in the fifth embodiment at wavelengths of 435.8343nm, 486.1327nm, 546.0740nm, 587.5618nm, and 656.2725nm is shown. In fig. 10(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. 10(a), the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 10(B), fig. 10(B) is a diagram of astigmatism of light of the optical lens 100 in the fifth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 10(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 10(C), fig. 10(C) is a graph illustrating a distortion curve of the optical lens 100 at a wavelength of 546.0740nm in the fifth embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 10(C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.0740 nm.

Sixth embodiment

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 third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, an infrared filter 70, and a cover glass 80, which are disposed in this order from the object side to the image side along the optical axis O.

It is understood that the refractive powers of the lenses of the optical lens system 100 in the sixth embodiment, the shapes of the object-side surface and the image-side surface of each lens are the same as those shown in the optical lens system 100 in the first embodiment, and therefore, the description thereof is omitted here.

In the sixth embodiment, the ratio of the relations satisfied by the optical lens 100 can be seen in the following table 16:

TABLE 16

Relation formula	Ratio of
		f456/f	3.65
f12/f2	-7.09
		Rs4/f2	15.68
f4*f5/(CT4-CT5)	-4.58mm
		f/SAGs9	3.464
Rs12/f6	-2.885
		(Rs6+Rs7)/(Rs6-Rs7)	9.8
TTL/ΣCT	1.924
		2*Imgh/EPD	3.787

Specifically, taking an example that the focal length f of the optical lens 100 is 3.49mm, the field angle FOV of the optical lens 100 is 118.7 °, and the f-number FNO is 2.0, the other parameters of the optical lens 100 are given in the following table 17 and table 18, respectively.

In table 17, the units of the Y radius, thickness, and focal length are all mm, and the refractive index, abbe number, and focal length of each lens are numerical values at a reference wavelength.

TABLE 17

Watch 18

Further, referring to fig. 12(a), a longitudinal spherical aberration curve of the optical lens 100 in the sixth embodiment at wavelengths of 435.8343nm, 486.1327nm, 546.0740nm, 587.5618nm, and 656.2725nm is shown. In fig. 12(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. 12(a), the spherical aberration value of the optical lens 100 in the sixth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 12(B), fig. 12(B) is a diagram of astigmatism of light of the optical lens 100 in the sixth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 12(B), astigmatism of the optical lens 100 is well compensated.

Referring to fig. 12(C), fig. 12(C) is a distortion curve diagram of the optical lens 100 in the sixth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height. As can be seen from fig. 12(C), the distortion of the optical lens 100 is well corrected at a wavelength of 546.0740 nm.

Please refer to table 19, which is a summary table of ratios of the relations satisfied by the optical lens of the present application in the first embodiment to the sixth embodiment:

watch 19

Referring to fig. 13, the present application further discloses a camera module 200, which includes an image sensor 201 and the optical lens 100 according to any of the first to seventh embodiments. The image sensor 201 is disposed on the 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. And will not be described in detail herein. It can be understood that the camera module 200 having the optical lens 100 has all the technical effects of the optical lens 100, i.e. the high-level aberration of the optical lens and the outer diameter of the lens can be effectively reduced; on the other hand, the influence of curvature of field generated by the front lens group (namely the combined lens of the first lens, the second lens and the third lens) on the resolving power can be corrected, so that the resolution and the depth of field range are effectively improved, and the imaging definition is improved. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 14, the present application further discloses an electronic device 300, 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. 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. Namely, the high-order aberration of the optical lens and the outer diameter of the lens can be effectively reduced; on the other hand, the influence of curvature of field generated by the front lens group (namely the combined lens of the first lens, the second lens and the third lens) on the resolving power can be corrected, so that the resolution and the depth of field range are effectively improved, and the imaging definition is improved. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

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, characterized in that: 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 arranged in sequence from an object side to an image side along an optical axis;

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

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

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

the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region, and is cemented with the image-side surface of the fourth lens element to form a cemented lens;

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

the optical lens comprises six lenses with refractive power;

the optical lens satisfies the following relationship:

3.0＜f456/f＜4.2，2<f/SAGs9<6；

wherein f456 is a combined focal length of the fourth lens, the fifth lens, and the sixth lens, SAGs9 is a sagittal height at a maximum optically effective radius of an image side surface of the fourth lens, and f is a focal length of the optical lens.

2. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relationship:

-8＜f12/f2＜-1；

3. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

4<Rs4/f2<16；

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

-8mm<f4*f5/(CT4-CT5)<-3mm；

5. The optical lens of claim 1, wherein: the optical lens satisfies the following relational expression: -4< Rs12/f6< -2;

6. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

8<(Rs6+Rs7)/(Rs6-Rs7)<16；

7. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

1.7<TTL/ΣCT<2.2；

wherein, TTL is the total length of the optical lens, and Σ CT is the thickness of each lens of the optical lens on the optical axis.

8. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

3.5<2*Imgh/EPD<4.2；

wherein Imgh is half of the image height corresponding to the maximum field angle of the optical lens, and EPD is the entrance pupil diameter of the optical lens.

9. The utility model provides a module of making a video recording which characterized in that: the camera module comprises an image sensor and the optical lens of 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 housing and the camera module of claim 9, the camera module being disposed on the housing.