CN112305715A

CN112305715A - Optical lens and electronic device

Info

Publication number: CN112305715A
Application number: CN202011268322.6A
Authority: CN
Inventors: 赵哲; 宋越; 王东方; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-02-02
Anticipated expiration: 2040-11-13
Also published as: CN112305715B; CN115826193A

Abstract

The application discloses an optical lens and an electronic device including the same. The optical lens sequentially comprises from an object side to an image side along an optical axis: the image side surface of the first lens is a concave surface; a second lens with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a fourth lens having a focal power, an object-side surface of which is convex; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; and a sixth lens having optical power.

Description

Optical lens and electronic device

Technical Field

The present disclosure relates to the field of optical elements, and more particularly, to an optical lens and an electronic device.

Background

With the development of the automatic driving technology, the vehicle-mounted lens is taken as a key component of an automatic driving assistance system, and plays a crucial role in safe driving of an automatic driving vehicle. User requirements for the size, resolution and imaging quality of the on-board lens are also increasing. In particular, the on-vehicle lens in the automatic driving assistance system has a special requirement compared with the general optical lens. For example, the vehicle-mounted optical lens requires that the diameter of a front port is as small as possible, the light transmission capability is strong, the vehicle-mounted optical lens can adapt to the change of brightness of the external environment, and particularly, the automatic driving vehicle has the requirements of higher imaging definition and no ghost image on the optical lens.

Disclosure of Invention

An aspect of the present application provides an optical lens. The optical lens sequentially comprises from an object side to an image side along an optical axis: the image side surface of the first lens is a concave surface; a second lens with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a fourth lens having a focal power, an object-side surface of which is convex; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; and a sixth lens having optical power.

In one embodiment, the object side surface of the first lens is convex.

In one embodiment, the object side surface of the first lens is concave.

In one embodiment, the second lens has a negative optical power.

In one embodiment, the second lens has a positive optical power.

In one embodiment, the fourth lens has positive optical power and the image-side surface thereof is convex.

In one embodiment, the fourth lens has a negative power and its image-side surface is concave.

In one embodiment, the fifth lens has a negative power and the object side surface is concave.

In one embodiment, the fifth lens has positive optical power and the object side surface is convex.

In one embodiment, the sixth lens element has positive optical power, and has a convex object-side surface and a concave image-side surface.

In one embodiment, the sixth lens element has positive optical power, and has a concave object-side surface and a convex image-side surface.

In one embodiment, the sixth lens element has positive optical power, and has a convex object-side surface and a convex image-side surface.

In one embodiment, the sixth lens element has a negative power and has a convex object-side surface and a concave image-side surface.

In one embodiment, the sixth lens element has a negative power and has a concave object-side surface and a convex image-side surface.

In one embodiment, the sixth lens element has a negative optical power, and the object side surface is concave and the image side surface is concave.

In one embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens.

In one embodiment, the sixth lens may have an aspherical mirror surface.

In one embodiment, a distance TTL between a center of an object side surface of the first lens element and an imaging surface of the optical lens on an optical axis and a total effective focal length F of the optical lens may satisfy: TTL/F is less than or equal to 7.

In one embodiment, the maximum field angle FOV of the optical lens, the distance TTL from the center of the object-side surface of the first lens to the imaging surface of the optical lens on the optical axis, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.05.

In one embodiment, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: D/H/FOV is less than or equal to 0.03.

In one embodiment, the effective focal length F45 of the cemented lens formed by the fourth lens and the fifth lens cemented together and the total effective focal length F of the optical lens may satisfy: F45/F is more than or equal to 1 and less than or equal to 8.

In one embodiment, the lens edge slope K2 of the image-side surface of the first lens corresponding to the maximum field angle of the optical lens can satisfy: arctan (1/K2) ≧ 35.

In one embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: (FOV F)/H.gtoreq.70.

In one embodiment, a distance d8i between the center of the object side surface of the fourth lens and the imaging surface of the optical lens on the optical axis and a distance TTL between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis can satisfy: d8i/TTL is more than or equal to 0.3.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the center thickness T2 of the second lens may satisfy: the absolute value of R4/(| R3| + T2) | is less than or equal to 0.2.

In one embodiment, the center thickness Tn1 of the n-th 1 lens having the largest center thickness among the second to fourth lenses and the center thickness Tm1 of the m-th 1 lens having the smallest center thickness among the second to fourth lenses may satisfy: tn1/Tm1 is less than or equal to 2, wherein n1 and m1 are selected from 2, 3 and 4.

In one embodiment, the center thickness Tn2 of the n-th 2 lens with the largest center thickness of the second, third, and fifth lenses and the center thickness Tm2 of the m-th 2 lens with the smallest center thickness of the second, third, and fifth lenses may satisfy: tn2/Tm2 is less than or equal to 2, wherein n2 and m2 are selected from 2, 3 and 5.

In one embodiment, the refractive index Nd1 of the first lens and the refractive index Nd2 of the second lens may satisfy: nd1/Nd2 is more than or equal to 0.5 and less than or equal to 1.5.

In one embodiment, the effective focal length F3 of the third lens and the effective focal length F5 of the fifth lens may satisfy: the absolute value of F3/F5 is more than or equal to 1.2 and less than or equal to 2.8.

In one embodiment, the effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens may satisfy: the absolute value of F3/F4 is more than or equal to 1 and less than or equal to 3.

In one embodiment, the effective focal length of the third lens F3, the effective focal length of the fourth lens F4, the temperature coefficient of refraction dn/dt (3) of the third lens, and the temperature coefficient of refraction dn/dt (4) of the fourth lens may satisfy: -2X 10⁶≤(F3+F4)/(dn/dt(3)+dn/dt(4))≤-4×10⁵。

In one embodiment, the effective focal length of the third lens F3, the effective focal length of the fifth lens F5, the temperature coefficient of refraction dn/dt (3) of the third lens, and the temperature coefficient of refraction dn/dt (5) of the fifth lens may satisfy: -2X 10⁶≤(F3+F5)/(dn/dt(3)+dn/dt(5))≤-4×10⁵。

In one embodiment, the radian θ of the maximum field angle of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: (H-Fxtheta)/(Fxtheta) is less than or equal to-0.1.

In one embodiment, the lens edge slope K11 of the object-side surface of the sixth lens corresponding to the maximum field angle of the optical lens can satisfy: the arctan (1/K11) is less than or equal to-4.

In one embodiment, the aperture value FNO of the optical lens and the total effective focal length F of the optical lens may satisfy: FNO/F is not less than 0.1.

In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F5 of the fifth lens may satisfy: the absolute value of F4/F5 is more than or equal to 0.2 and less than or equal to 3.

In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens may satisfy: the absolute value of F3/F is more than or equal to 1 and less than or equal to 4.

In one embodiment, a distance BFL on the optical axis from the center of the image-side surface of the sixth lens element to the imaging surface of the optical lens and a distance TTL on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the optical lens may satisfy: BFL/TTL is more than or equal to 0.05.

In one embodiment, a distance d23 between the center of the image-side surface of the second lens and the center of the object-side surface of the third lens on the optical axis and a distance TTL between the center of the object-side surface of the first lens and the imaging surface of the optical lens on the optical axis may satisfy: d23/TTL is more than or equal to 0.04 and less than or equal to 0.2.

In one embodiment, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens may satisfy: and the | F6/F | is more than or equal to 3.5.

In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens may satisfy: F1/F is not less than-2.0 and not more than-1.0.

In one embodiment, the radius of curvature R10 of the image-side surface of the fifth lens and the total effective focal length F of the optical lens satisfy: R10/F is more than or equal to-6.0 and less than or equal to-1.0.

In one embodiment, the central thickness T2 of the second lens and the distance TTL between the center of the object-side surface of the first lens and the imaging surface of the optical lens on the optical axis may satisfy: T2/TTL is more than or equal to 0.15.

Another aspect of the present application provides an optical lens. The optical lens sequentially comprises 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 has negative focal power; the third lens has positive focal power; and the distance d8i between the center of the object side surface of the fourth lens and the imaging surface of the optical lens on the optical axis and the distance TTL between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis can satisfy the following conditions: d8i/TTL is more than or equal to 0.3.

In one embodiment, the first lens element has a convex object-side surface and a concave image-side surface.

In one embodiment, the first lens element has a concave object-side surface and a concave image-side surface.

In one embodiment, the second lens has a negative power and has a concave object-side surface and a convex image-side surface.

In one embodiment, the second lens has a positive optical power, and the object side surface is concave and the image side surface is convex.

In one embodiment, the object-side surface of the third lens element is convex and the image-side surface of the third lens element is convex.

In one embodiment, the fourth lens element has positive optical power, and has a convex object-side surface and a convex image-side surface.

In one embodiment, the fourth lens element has a negative power and has a convex object-side surface and a concave image-side surface.

In one embodiment, the fifth lens element has a negative power and has a concave object-side surface and a convex image-side surface.

In one embodiment, the fifth lens element has positive optical power, and the object side surface of the fifth lens element is convex and the image side surface of the fifth lens element is convex.

In one embodiment, the sixth lens may have an aspherical mirror surface.

Another aspect of the present application provides an electronic device. The electronic device comprises the optical lens provided by the application and an imaging element for converting an optical image formed by the optical lens into an electric signal.

The six lenses are adopted, and the shape, focal power and the like of each lens are optimally set, so that the optical lens has at least one beneficial effect of high resolution, miniaturization, no ghost image, low cost, good temperature performance and the like.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic structural view showing an optical lens according to embodiment 2 of the present application;

fig. 3 is a schematic structural view showing an optical lens according to embodiment 3 of the present application;

fig. 4 is a schematic structural view showing an optical lens according to embodiment 4 of the present application;

fig. 5 is a schematic structural view showing an optical lens according to embodiment 5 of the present application;

fig. 6 is a schematic structural view showing an optical lens according to embodiment 6 of the present application;

fig. 7 is a schematic structural view showing an optical lens according to embodiment 7 of the present application;

fig. 8 is a schematic structural view showing an optical lens according to embodiment 8 of the present application;

fig. 9 is a schematic structural view showing an optical lens according to embodiment 9 of the present application;

fig. 10 is a schematic structural view showing an optical lens according to embodiment 10 of the present application; and

fig. 11 is a schematic view showing a structure of an optical lens according to embodiment 11 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the image side is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles and other aspects of the present application are described in detail below.

In an exemplary embodiment, the optical lens includes, for example, six lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged along the optical axis in sequence from the object side to the image side.

In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image plane. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

In an exemplary embodiment, the first lens may have a negative power. The first lens may have a convex concave type or a concave type. The first lens has negative focal power, the image side surface is a concave surface, the large-field light rays can be collected as far as possible and enter a rear optical system, the direction trend of the large-angle light rays in the edge area is fixed, the imaging aberration of the large-angle light rays is reduced, and the resolution is improved. When the object side surface of the first lens is convex, a high-refractive-index material (such as the refractive index Nd1 ≧ 1.8) can be preferably used; when the object side surface of the first lens is a concave surface, a low-refractive-index material (such as the refractive index Nd1 is greater than or equal to 1.5) can be preferably used, which is beneficial to reducing the front end aperture of the optical lens and improving the imaging quality. In practical application, considering that the use environment of the vehicle-mounted lens after being installed outdoors may be in severe weather environments such as rain, snow and the like, the first lens is a meniscus lens with a convex and concave surface, and sliding of water drops is facilitated, so that influence on imaging is reduced. The first lens may preferably be an aspherical lens to further improve the resolution quality.

In exemplary embodiments, the second lens may have a positive optical power or a negative optical power. The second lens may have a meniscus type. The power and surface type arrangement of the second lens is beneficial to collecting the light emitted from the first lens, so that the light trend is smoothly transited. Preferably, the shape of the second lens can be close to the shape of a concentric circle, so that the peripheral light and the central light of the optical lens have optical path difference, the central light is diffused and enters the rear optical lens, the front end caliber of the lens is reduced, the size of the lens is reduced, the miniaturization is realized, and the cost is reduced.

In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex type. The third lens has positive focal power, can converge light rays, enables the diffused light rays to smoothly enter the rear optical lens, is beneficial to compressing the light rays, and can further enable the light rays to stably transit.

In exemplary embodiments, the fourth lens may have a positive power or a negative power. The fourth lens may have a convex-convex type or a convex-concave type.

In an exemplary embodiment, the fifth lens may have a positive power or a negative power. The fifth lens may have a convex type or a concave-convex type.

In an exemplary embodiment, the sixth lens may have a positive power or a negative power. The sixth lens may have a convex-concave type, a concave-convex type, a convex-convex type, or a concave-concave type. The focal power and the surface type design of the sixth lens can smoothly transit the front light to the imaging surface of the optical lens, reduce the optical total length, correct astigmatism and curvature of field and improve the resolving power of the optical lens. Preferably, the sixth lens may have an aspherical mirror surface to improve the resolution quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 7, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F further satisfy: TTL/F is less than or equal to 6.5. The TTL/F is less than or equal to 7, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/FOV is less than or equal to 0.05, wherein FOV is the maximum field angle of the optical lens, TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, TTL, H, and FOV further satisfy: TTL/H/FOV is less than or equal to 0.03. The TTL/H/FOV is less than or equal to 0.05, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.03, wherein FOV is the maximum field angle of the optical lens, D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, D, H and the FOV further satisfy: D/H/FOV is less than or equal to 0.01. The D/H/FOV is less than or equal to 0.03, the caliber of the front end is favorably reduced, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F45/F is less than or equal to 1 and less than or equal to 8, wherein F45 is the effective focal length of a cemented lens formed by the fourth lens and the fifth lens which are cemented together, and F is the total effective focal length of the optical lens. More specifically, F45 and F further satisfy: F45/F is more than or equal to 2 and less than or equal to 6. F45/F is more than or equal to 1 and less than or equal to 8, the light trend between the third lens and the sixth lens can be controlled, the aberration caused by the incidence of high-angle light through the third lens is reduced, and the optical lens is compact in structure and small in size.

In an exemplary embodiment, an optical lens according to the present application may satisfy: arctan (1/K2) ≧ 35, where K2 is the lens edge slope of the image-side surface of the first lens corresponding to the maximum field angle of the optical lens, and arctan (1/K2) is the opening angle of the image-side surface of the first lens corresponding to the maximum field angle of the optical lens. More specifically, K2 further satisfies: arctan (1/K2) ≧ 42. The requirement that arctan (1/K2) is more than or equal to 35 is met, the field angle of the image side surface of the first lens can be larger, and the fast focusing of the large-angle peripheral light rays entering through the first lens is facilitated, so that the imaging quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV multiplied by F)/H is more than or equal to 70, wherein FOV is the maximum angle of view of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum angle of view of the optical lens. More specifically, FOV, F and H further satisfy: (FOV F)/H.gtoreq.75. The optical lens meets the condition that (FOV multiplied by F)/H is more than or equal to 70, is favorable for ensuring that the optical lens has the characteristics of long focus and large field angle at the same time, is favorable for improving the imaging effect of the optical lens, and simultaneously can give consideration to the large field angle and realize large-angle resolution.

In an exemplary embodiment, an optical lens according to the present application may satisfy: d8i/TTL is more than or equal to 0.3, wherein d8i is the distance between the center of the object side surface of the fourth lens and the imaging surface of the optical lens on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis. More specifically, d8i and TTL further satisfy: d8i/TTL is more than or equal to 0.4. The d8i/TTL is more than or equal to 0.3, and ghost images are eliminated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.2 ≦ R4/(| R3| + T2) | ≦ 1.2, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, and T2 is the center thickness of the second lens. More specifically, R4, R3, and T2 may further satisfy: the absolute value of R4/(| R3| + T2) | is less than or equal to 1 and is more than or equal to 0.4. The requirement that the absolute R4/(| R3| + T2) | is less than or equal to 1.2 is met, the shape of the second lens is favorably close to the shape of a concentric circle, so that the optical path difference exists between peripheral light rays and central light rays of the optical lens, the central light rays are diffused and enter the rear optical lens, the front end aperture of the lens is favorably reduced, the size of the lens is reduced, the miniaturization is favorably realized, and the cost is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: tn1/Tm1 ≦ 2, wherein Tn1 is the center thickness of the n-th 1 lens having the largest center thickness among the second to fourth lenses, Tm1 is the center thickness of the m-th 1 lens having the smallest center thickness among the second to fourth lenses, and n1 and m1 are selected from 2, 3, 4. More specifically, Tn1 and Tm1 further satisfy: tn1/Tm1 is less than or equal to 1.5, and the requirement of Tn1/Tm1 is less than or equal to 2 is met, so that the center thicknesses of the second lens and the fourth lens are close, the light trend of the optical lens is smooth, the deflection change is small, and the sensitivity is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: tn2/Tm2 ≦ 2, wherein Tn2 is the center thickness of the n-th 2 lens having the largest center thickness among the second, third and fifth lenses, Tm2 is the center thickness of the m-th 2 lens having the smallest center thickness among the second, third and fifth lenses, and n2 and m2 are selected from 2, 3, 5. More specifically, Tn2 and Tm2 further satisfy: tn2/Tm2 is less than or equal to 1.7. The Tn2/Tm2 is less than or equal to 2, so that the center thicknesses of the second lens, the third lens and the fifth lens are close to each other, the light trend of the optical lens is smooth, the deflection change is small, and the sensitivity is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.5-1.5 of Nd1/Nd2, wherein Nd1 is the refractive index of the first lens, and Nd2 is the refractive index of the second lens. More specifically, Nd1 and Nd2 further satisfy: nd1/Nd2 is more than or equal to 0.9 and less than or equal to 1.1. The optical lens meets the requirement that Nd1/Nd2 is more than or equal to 0.5 and less than or equal to 1.5, the refractive indexes of the first lens and the second lens are close, and the first lens and the second lens are made of high-refractive-index materials preferably, so that the direction of large-angle light rays entering the first lens can be changed rapidly, the front port diameter is reduced, and the imaging quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F5| is less than or equal to 1.2 and less than or equal to 2.8, wherein F3 is the effective focal length of the third lens, and F5 is the effective focal length of the fifth lens. More specifically, F3 and F5 may further satisfy: the absolute value of F3/F5 is more than or equal to 1.6 and less than or equal to 2.51. The requirement that the absolute value of F3/F5 is less than or equal to 2.8 is met, light can be smoothly transited, aberration caused by over steep trend of light, over large angle and the like is reduced, and image quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F4| is less than or equal to 1 and less than or equal to 3, wherein F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens. More specifically, F3 and F4 may further satisfy: the absolute value of F3/F4 is more than or equal to 1.1 and less than or equal to 2.5. The requirement that the absolute value of F3/F4 is less than or equal to 1 is met, light can be smoothly transited, aberration caused by over steep trend of light, over large angle and the like is reduced, and image quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -2X 10⁶≤(F3+F4)/(dn/dt(3)+dn/dt(4))≤-4×10⁵Wherein F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, dn/dt (3) is the temperature coefficient of refraction of the third lens, and dn/dt (4) is the temperature coefficient of refraction of the fourth lens. More specifically, F3, F4, dn/dt (3) and dn/dt (4) further satisfy: -1X 10⁶≤(F3+F4)/(dn/dt(3)+dn/dt(4))≤-5.7×10⁵. Satisfies-2 x 10⁶≤(F3+F4)/(dn/dt(3)+dn/dt(4))≤-4×10⁵The optical lens is beneficial to reducing the deflection change of light rays of the optical lens in high and low temperature environments, and the optical lens has better temperature performance.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -2X 10⁶≤(F3+F5)/(dn/dt(3)+dn/dt(5))≤-4×10⁵Wherein F3 is the effective focal length of the third lens, F5 is the effective focal length of the fifth lens, dn/dt (3) is the temperature coefficient of refraction of the third lens, and dn/dt (5) is the temperature coefficient of refraction of the fifth lens. More specifically, F3, F5, dn/dt (3) and dn/dt (5) further satisfy: -9X 10⁵≤(F3+F5)/(dn/dt(3)+dn/dt(5))≤-4.8×10⁵. Satisfies-2 x 10⁶≤(F3+F5)/(dn/dt(3)+dn/dt(5))≤-4×10⁵The optical lens is beneficial to reducing the deflection change of light rays of the optical lens in high and low temperature environments, and the optical lens has better temperature performance.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (H-Fxtheta)/(Fxtheta) is less than or equal to-0.1, wherein theta is the radian of the maximum field angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, H, F and θ further satisfy: (H-Fxtheta)/(Fxtheta) is less than or equal to-0.2. The requirement that (H-Fxtheta)/(Fxtheta) is less than or equal to-0.1 is met, the total effective focal length of the lens can be increased under the condition that the field angle and the size of an imaging surface of the lens are not changed, and the imaging effect of the central area of the imaging surface of the lens is highlighted.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and arctan (1/K11) is less than or equal to-4, wherein K11 is the slope of the lens edge of the object side surface of the sixth lens corresponding to the maximum field angle of the optical lens, and arctan (1/K11) is the field angle of the object side surface of the sixth lens corresponding to the maximum field angle of the optical lens. More specifically, K11 further satisfies: the arctan (1/K11) is less than or equal to-6. The arctan (1/K11) is less than or equal to-4, so that the edge field angle of the object side surface of the sixth lens is negative, and the sixth lens is bent to the object side surface, and the astigmatism and the field curvature are corrected.

In an exemplary embodiment, an optical lens according to the present application may satisfy: FNO/F is more than or equal to 0.1, wherein FNO is the aperture value of the optical lens, and F is the total effective focal length of the optical lens. More specifically, FNO and F further may satisfy: FNO/F is more than or equal to 0.28. The FNO/F is more than or equal to 0.1, and the optical lens has the characteristic of large aperture.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F4/F5| is less than or equal to 0.2 and less than or equal to 3, wherein F4 is the effective focal length of the fourth lens, and F5 is the effective focal length of the fifth lens. More specifically, F4 and F5 may further satisfy: the absolute value of F4/F5 is more than or equal to 0.6 and less than or equal to 2.6. The condition that the absolute value of F4/F5 is less than or equal to 3 is met, light can be smoothly transited, and chromatic aberration can be corrected.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F | is less than or equal to 1 and less than or equal to 4, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens. More specifically, F3 and F further satisfy: the absolute value of F3/F is more than or equal to 1.7 and less than or equal to 3.3. The requirement that | F3/F | is less than or equal to 1 and less than or equal to 4 is met, and the method is favorable for balancing various aberrations of the optical lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and the BFL/TTL is more than or equal to 0.05, wherein the BFL is the distance from the center of the image side surface of the sixth lens element to the imaging surface of the optical lens on the optical axis, and the TTL is the distance from the center of the object side surface of the first lens element to the imaging surface of the optical lens on the optical axis. More specifically, BFL and TTL further satisfy: BFL/TTL is more than or equal to 0.08. The requirement that BFL/TTL is more than or equal to 0.05 is met, the structure of the lens is compact on the basis of ensuring miniaturization and assembly characteristics, the sensitivity of the lens to MTF is reduced, the production yield is improved, and the production cost is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and d23/TTL is not less than 0.04 and not more than 0.2, wherein d23 is the distance between the center of the image side surface of the second lens and the center of the object side surface of the third lens on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis. More specifically, d23 and TTL further satisfy: d23/TTL is more than or equal to 0.06 and less than or equal to 0.11. D23/TTL is more than or equal to 0.04 and less than or equal to 0.2, so that the distance between the first lens and the second lens is smaller, the miniaturization of the lens is facilitated, the sensitivity of the lens to MTF is reduced, and the production cost is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F6/F | ≧ 3.5, wherein F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens. More specifically, F6 and F further satisfy: i F6/F | ≧ 4.1. The requirement that | F6/F | ≧ 3.5 is met, and the method is beneficial to improving the resolving power so as to reduce the influence of defocusing on the optical lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -2.0 ≦ F1/F ≦ -1.0, where F1 is the effective focal length of the first lens and F is the total effective focal length of the optical lens. More specifically, F1 and F further satisfy: F1/F is not less than-1.82 and not more than-1.26. The requirement that F1/F is less than or equal to-1.0 is more than or equal to-2.0, which is favorable for enabling more light rays to enter the optical lens smoothly and increasing the illumination intensity.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 6.0R 10/F-1.0, wherein R10 is the curvature radius of the image side surface of the fifth lens, and F is the total effective focal length of the optical lens. More specifically, R10 and F further satisfy: R10/F is more than or equal to-4.8 and less than or equal to-1.4. R10/F is more than or equal to-6.0 and less than or equal to-1.0, and the image side surface of the fifth lens can be convex.

In an exemplary embodiment, an optical lens according to the present application may satisfy: T2/TTL is more than or equal to 0.15, wherein T2 is the central thickness of the second lens, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis. More specifically, T2 and TTL further can satisfy: T2/TTL is more than or equal to 0.15 and less than or equal to 0.3. T2/TTL is more than or equal to 0.15, so that light emitted by the first lens can be collected, the trend of the light is in stable transition, the sensitivity of the lens to MTF is reduced, and the resolution is improved.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the second lens and the third lens to further improve the imaging quality of the optical lens. The diaphragm is arranged between the second lens and the third lens, so that the aperture of the diaphragm is increased, the light rays entering the optical lens are effectively converged, the aperture of the lens is reduced, and the total length of the optical lens is shortened. In the embodiment of the present application, the stop may be disposed in the vicinity of the image side surface of the second lens or in the vicinity of the object side surface of the third lens. It should be noted, however, that the positions of the diaphragms disclosed herein are merely examples and not limitations; in alternative embodiments, the diaphragm may be disposed at other positions according to actual needs. For example, a diaphragm may be further disposed between the third lens and the fourth lens to further improve the imaging quality of the optical lens.

In an exemplary embodiment, the optical lens of the present application may further include a filter and/or a protective glass disposed between the sixth lens and the imaging surface, as needed, to filter light rays having different wavelengths and prevent an image side element (e.g., a chip) of the optical lens from being damaged.

As known to those skilled in the art, cemented lenses may be used to minimize or eliminate chromatic aberration. The cemented lens used in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby realizing high resolution and improving the imaging definition of the lens. In addition, the use of the cemented lens can also simplify the assembly process in the lens manufacturing process.

In an exemplary embodiment, the fourth lens and the fifth lens may be cemented to form a cemented lens. The fourth lens with the convex object-side surface and the convex image-side surface is cemented with the fifth lens with the concave object-side surface and the convex image-side surface, or the fourth lens with the convex object-side surface and the concave image-side surface is cemented with the fifth lens with the convex object-side surface and the convex image-side surface, so that light passing through the fourth lens can be smoothly transited to the rear optical system, and the total length of the optical lens can be reduced. Of course, the fourth lens and the fifth lens may not be cemented, which is advantageous for improving the resolution.

The fourth lens and the fifth lens constituting the cemented lens described above are a lens having positive power and a lens having negative power, respectively, wherein the lens having positive power has a lower refractive index and the lens having negative power has a higher refractive index (with respect to the lens having positive power). And the object-side surface and the image-side surface of the cemented lens are convex. Therefore, the light can be further converged and then transited to a rear optical system.

The gluing mode adopted between the lenses has at least one of the following advantages: various aberrations of the optical lens are fully corrected, and on the premise that the optical lens is compact in structure, the optical performances such as resolution, optimized distortion and CRA (cross-correlation criterion) can be improved; the light quantity loss caused by reflection between lenses is reduced; the matching of high and low refractive indexes is beneficial to the rapid transition of front light, the aperture of the diaphragm is increased, the light flux is improved, and the night vision requirement is facilitated; reducing the separation distance between the two lenses, thereby reducing the overall length of the system; the assembling parts between the lenses are reduced, so that the working procedures are reduced, and the cost is reduced; the tolerance sensitivity problems of inclination/core deviation and the like generated in the assembling process of the lens unit are reduced, and the production yield is improved; the cemented lens can have positive focal power, so that light can be effectively and stably converged after passing through the cemented lens, and further the light can stably reach an imaging surface; the overall weight and cost are reduced. The gluing design shares the whole chromatic aberration correction of the system, effectively corrects the aberration, improves the resolving power, enables the whole optical system to be compact, and meets the miniaturization requirement.

In an exemplary embodiment, the sixth lens may be an aspherical lens; the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be spherical lenses. Alternatively, the first lens and the sixth lens may be aspherical lenses; the second lens, the third lens, the fourth lens, and the fifth lens may be spherical lenses. Alternatively, the first lens, the second lens, and the sixth lens may be aspherical lenses; the third lens, the fourth lens, and the fifth lens may be spherical lenses. Alternatively, the second lens, the third lens, and the sixth lens may be aspherical lenses; the first lens, the fourth lens, and the fifth lens may be spherical lenses. In particular, in order to improve the resolution quality of the optical system, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may all be aspheric lenses. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. The aspheric lens helps to correct system aberration and improve resolving power.

The optical lens according to the above-mentioned embodiment of the present application achieves at least one of the advantages of high resolution (up to eight million pixels or more), miniaturization, long focus, large field angle, no ghost image, and good imaging quality of the optical system by reasonably setting the shape and focal power of each lens, in the case of using only 6 lenses. Meanwhile, the optical lens also meets the requirements of small lens volume, small front end caliber, low sensitivity, small influence on the resolution of the lens at high and low temperatures, wide working range and high production yield. The total effective focal length of the optical lens is longer, the central area has high-angle resolution, the identification degree of an environmental object can be improved, and the detection area of the central part can be increased in a targeted manner.

According to the optical lens of the embodiment of the application, the cemented lens is arranged, so that the influence of a ghost image on the optical lens can be effectively eliminated, and the optical lens has higher resolution quality on the basis of eliminating the ghost image. Through reasonable collocation of focal power and temperature coefficient, the influence of temperature change on the focal power of the optical lens can be effectively improved, and the stability of the resolving power of the optical lens at different temperatures is further improved. Through reasonable selection of lens materials, smooth light trend is facilitated, and the sensitivity of the optical lens is reduced.

In an exemplary embodiment, the first to sixth lenses in the optical lens may each be made of glass. The optical lens made of glass can inhibit the deviation of the back focus of the optical lens along with the temperature change so as to improve the stability of the system. Meanwhile, the glass material is adopted, so that the problem that the normal use of the lens is influenced due to the imaging blur of the lens caused by high and low temperature changes in the use environment can be avoided. Specifically, when the importance is paid to the resolution quality and the reliability, the first lens to the sixth lens may be all glass aspherical lenses. Of course, in the application where the requirement of temperature stability is low, the first lens to the sixth lens in the optical lens can also be made of plastic. The optical lens is made of plastic, so that the manufacturing cost can be effectively reduced.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical lens is not limited to include six lenses. The optical lens may also include other numbers of lenses, if desired.

Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens, in order from an object side to an image side along an optical axis, comprises: 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.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a concave-convex lens with negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a meniscus lens with negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a convex-concave lens having negative refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the second lens L2 and the third lens L3 to improve image quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the image side surface S4 of the second lens L2.

Optionally, the optical lens may further include a filter L7 and/or a protective glass L7' having an object side S13 and an image side S14. The filter L7 and/or the protective glass L7' may be used to correct color deviation and/or protect the image sensing chip IMA located at the imaging plane S15. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 1 shows a radius of curvature R, a thickness T/distance d (it is understood that the thickness T/distance d of the row of S1 is the center thickness T1 of the first lens L1, the thickness T/distance d of the row of S2 is the separation distance d23 between the image-side surface of the first lens L1 and the object-side surface of the second lens L2, and so on), a refractive index Nd, and a dispersion coefficient Vd of each lens of the optical lens of example 1.

TABLE 1

In embodiment 1, the first lens L1 and the sixth lens L6 may be aspherical lenses, and the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be spherical lenses. The profile x of each aspheric lens can be defined using, but not limited to, the following aspheric equation:

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 of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the conic coefficients k and the high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each of the aspherical mirror surfaces S1, S2, S11 and S12 in example 1.

TABLE 2

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

In the present embodiment, the first lens L1 and the sixth lens L6 may be aspheric lenses, and the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be spherical lenses.

Table 3 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 2. Table 4 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S1

-3.0252

-3.4380E-04

-6.3504E-04

7.7416E-05

-4.4814E-06

1.3407E-07

-1.6527E-09

/

S2

-0.9225

-8.5204E-03

-2.5436E-04

4.2431E-05

1.0040E-05

-2.0406E-06

1.3847E-07

-3.1649E-09

S11

6.7045

-2.2124E-03

-3.3276E-05

5.9600E-07

5.0553E-08

4.9668E-09

-5.9603E-11

5.4900E-12

S12

-22.8974

-2.0657E-03

-1.3803E-05

-3.2269E-06

5.6733E-07

-3.6367E-08

-1.3170E-09

-2.1644E-11

TABLE 4

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a meniscus lens with negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a convex-concave lens having negative refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 5 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 3. Table 6 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S1

-2.7714

-4.1194E-04

-5.5112E-04

6.1233E-05

-3.3135E-06

9.3891E-08

-1.1041E-09

/

S2

-0.8662

-7.5765E-03

4.2000E-04

6.6432E-05

1.7956E-06

-8.0670E-07

5.5181E-08

-1.0879E-09

S11

42.2396

-2.4958E-03

2.7700E-05

-5.3142E-07

1.8533E-07

-9.3191E-09

8.4192E-10

-3.3605E-11

S12

-35.6562

-2.3279E-03

-2.6900E-05

-9.5496E-07

4.1756E-07

-3.1262E-08

1.2763E-09

-2.3454E-11

TABLE 6

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a concave-convex lens with negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 7 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 4. Table 8 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S1

-8.3933

2.9512E-03

-3.5859E-04

2.0008E-05

-6.8328E-07

1.2222E-08

-7.2949E-11

/

S2

-1.0264

-4.1463E-05

3.4627E-04

-1.0313E-04

1.3124E-05

-3.0582E-08

-9.5680E-08

5.5215E-09

S11

-100.0000

-7.0230E-03

3.4286E-04

-5.2749E-05

6.2724E-06

-2.9739E-07

9.7134E-09

/

S12

-0.7354

-5.8211E-03

7.7404E-06

6.6708E-07

2.6942E-07

-1.2841E-08

3.8521E-10

/

TABLE 8

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 shows a schematic structural diagram of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a convex-concave lens having negative refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

In the present embodiment, the first lens L1, the second lens L2, and the sixth lens L6 may be aspheric lenses, and the third lens L3, the fourth lens L4, and the fifth lens L5 may be spherical lenses.

Table 9 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 5. Table 10 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Watch 10

Example 6

An optical lens according to embodiment 6 of the present application is described below with reference to fig. 6. Fig. 6 shows a schematic structural diagram of an optical lens according to embodiment 6 of the present application.

As shown in fig. 6, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a concave-convex lens with negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element L6 is a meniscus lens element with negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 11 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 6. Table 12 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 11

Flour mark

k

A4

A6

A8

A10

A12

A14

S1

-198.9042

1.4715E-03

-2.2507E-04

1.9181E-05

-9.6253E-07

2.6666E-08

-3.1499E-10

S2

0.4017

2.6322E-03

1.4700E-04

-1.0518E-06

2.7418E-06

-2.2299E-07

7.8720E-09

S11

87.3767

-3.2157E-03

-2.8924E-04

9.1790E-05

-1.2611E-05

8.4720E-07

-1.8020E-08

S12

-162.3540

-4.5246E-03

-1.2679E-05

1.5514E-05

-1.4420E-06

5.1453E-08

2.7655E-10

TABLE 12

Example 7

An optical lens according to embodiment 7 of the present application is described below with reference to fig. 7. Fig. 7 shows a schematic structural diagram of an optical lens according to embodiment 7 of the present application.

As shown in fig. 7, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a convex-concave lens with positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 13 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 7. Table 14 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 13

Flour mark

k

A4

A6

A8

A10

A12

S1

-78.7929

-1.7086E-03

2.2152E-04

-1.2834E-05

4.1091E-07

-5.4148E-09

S2

-1.6450

5.8671E-04

-5.4425E-05

4.0754E-05

-4.5292E-06

2.0623E-07

S3

-1.6059

-2.1102E-03

-2.1603E-05

-6.9406E-06

7.8482E-07

-1.5028E-08

S4

0.6516

-4.0241E-05

1.9518E-06

8.1706E-08

4.7985E-09

-2.2795E-10

S11

1.0341

-7.8035E-04

-1.8000E-05

-1.8397E-07

-2.8490E-09

1.9579E-11

S12

6.7367

-1.5571E-03

-3.9319E-05

-1.6091E-07

5.2270E-08

-1.1756E-09

TABLE 14

Example 8

An optical lens according to embodiment 8 of the present application is described below with reference to fig. 8. Fig. 8 shows a schematic structural diagram of an optical lens according to embodiment 8 of the present application.

As shown in fig. 8, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

Table 15 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 8. Table 16 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 15

Flour mark

k

A4

A6

A8

A10

A12

S1

-82.6330

-2.1419E-03

2.3776E-04

-1.3249E-05

4.1272E-07

-1.4171E-09

S2

-3.5819

1.7700E-03

-1.3263E-04

4.8750E-05

-4.9310E-06

2.0624E-07

S3

-1.4262

-2.1994E-03

-2.0235E-05

-8.1673E-06

8.5492E-07

-1.4975E-08

S4

0.3494

1.2901E-04

8.8864E-06

-2.4915E-07

2.3458E-08

-2.2872E-10

S11

36.6879

-7.6346E-04

-2.8191E-05

5.2104E-07

-3.6088E-08

3.8810E-11

S12

39.6221

-1.2379E-03

-9.1617E-05

2.2907E-06

1.9263E-08

-1.1761E-09

TABLE 16

Example 9

An optical lens according to embodiment 9 of the present application is described below with reference to fig. 9. Fig. 9 shows a schematic structural diagram of an optical lens according to embodiment 9 of the present application.

As shown in fig. 9, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a meniscus lens with negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a convex-concave lens with positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed between the third lens L3 and the fourth lens L4 at a position close to the object-side surface S8 of the fourth lens L4.

In the present embodiment, the second lens L2, the third lens L3, and the sixth lens L6 may be aspheric lenses, and the first lens L1, the fourth lens L4, and the fifth lens L5 may be spherical lenses.

Table 17 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 9. Table 18 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 17

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S3

2.1446

-1.3895E-03

-1.2895E-05

7.0920E-06

-1.4005E-07

5.4569E-15

5.7808E-19

3.3087E-22

S4

-0.5905

3.1235E-04

2.9977E-05

-3.2432E-07

5.8481E-08

-9.4809E-10

-3.1037E-11

-2.3211E-21

S5

2.4808

1.9211E-04

2.2383E-05

-2.0846E-06

2.0749E-07

-1.2501E-09

9.2822E-11

-1.1382E-12

S6

5.8065

-5.4344E-04

-2.0462E-05

5.2470E-06

-2.8138E-07

2.9250E-09

4.2593E-11

1.5574E-12

S11

100.0000

-2.0284E-03

-5.5268E-05

1.1165E-05

-8.0881E-07

2.2811E-08

-1.2846E-10

9.2090E-12

S12

-100.0000

-2.8317E-03

-1.4488E-05

5.9739E-06

-3.4085E-07

7.1462E-09

2.1056E-11

-3.8502E-13

Watch 18

Example 10

An optical lens according to embodiment 10 of the present application is described below with reference to fig. 10. Fig. 10 shows a schematic structural diagram of an optical lens according to embodiment 10 of the present application.

As shown in fig. 10, the optical lens, in order from an object side to an image side along an optical axis, comprises: 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.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a meniscus lens with negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a meniscus lens having positive refractive power, and has a concave object-side surface S11 and a convex image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 19 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 10. Table 20 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 10, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 19

Flour mark

k

A4

A6

A8

A10

A12

S3

-0.1311

-2.8570E-04

-1.1071E-05

3.9981E-06

-1.3715E-07

-2.0579E-19

S4

0.1024

1.9283E-05

1.9377E-05

-7.9504E-08

-4.2562E-09

-6.2519E-19

S5

-1.6061

1.8421E-04

1.3411E-05

-3.3735E-06

2.7030E-07

-1.2283E-08

S6

-0.5515

-3.5990E-04

-5.3693E-05

6.6341E-06

-4.5626E-07

8.5693E-09

S11

75.5480

-2.7985E-03

4.1325E-05

-8.0360E-06

-2.0062E-08

2.0688E-08

S12

61.1293

-4.3146E-03

5.2225E-05

4.9216E-07

-9.6047E-08

2.3432E-09

Watch 20

Example 11

An optical lens according to embodiment 11 of the present application is described below with reference to fig. 11. Fig. 11 shows a schematic structural diagram of an optical lens according to embodiment 11 of the present application.

As shown in fig. 11, the optical lens system, in order from an object side to an image side along an optical axis, comprises: 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.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element L6 is a biconvex lens with positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the second lens L2 and the third lens L3 to improve image quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object-side surface S6 of the third lens L3.

Optionally, the optical lens may further include a filter L7 having an object side S13 and an image side S14. The filter L7 can be used to correct color deviations. The optical lens may further include a protective glass L8 having an object-side surface S15 and an image-side surface S16. The protective glass L8 may be used to protect the image sensing chip IMA located at the imaging plane S17. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 21 shows the radius of curvature R, thickness T/distance d, refractive index Nd, and dispersion coefficient Vd of each lens of the optical lens of example 11. Table 22 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 11, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 21

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S1

100.0000

-2.2324E-03

2.4548E-04

-1.3712E-05

4.2317E-07

-5.4033E-09

2.4709E-24

8.0991E-30

S2

-2.0904

-1.2495E-04

7.3804E-05

3.3917E-05

-4.4699E-06

2.0623E-07

-3.7445E-29

2.1373E-33

S3

-1.7437

-2.1064E-03

-6.5028E-06

-9.5015E-06

9.2515E-07

-4.4950E-08

1.6295E-29

3.8694E-32

S4

-0.4554

-1.6488E-04

-1.6112E-07

-1.6982E-07

9.3420E-09

2.4709E-24

2.7703E-24

-1.5915E-28

S11

-0.8221

-1.0214E-04

3.7426E-06

-6.7555E-07

1.0646E-08

8.8793E-11

/

S12

-52.0076

-5.9389E-04

3.4949E-06

-2.1297E-06

9.5205E-08

-1.2056E-09

/

TABLE 22

In summary, examples 1 to 11 satisfy the relationships shown in the following tables 23-1 and 23-2, respectively. In tables 23-1 and 23-2, units of TTL, F, H, D8i, F45, F1, F2, F3, F4, F5, F6, BFL, D23, R1, R3, R4, R8, R10, R11, R12, T2, T3, T4, T5 are millimeters (mm), units of FOV are degrees (°), and units of θ are radians (rad).

TABLE 23-1

TABLE 23-2

The present application also provides an electronic device that may include the optical lens according to the above-described embodiments of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a stand-alone electronic device such as a range finding camera or may be an imaging module integrated on a device such as a range finding device. Furthermore, the electronic device may also be a stand-alone imaging device such as a vehicle-mounted camera, or may be an imaging module integrated on a driving assistance system such as a car.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The optical lens assembly, in order from an object side to an image side along an optical axis, comprises:

the image side surface of the first lens is a concave surface;

a second lens with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;

a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

a fourth lens having a focal power, an object-side surface of which is convex;

a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; and

a sixth lens having optical power.

2. An optical lens barrel according to claim 1, wherein the object side surface of the first lens is convex.

3. An optical lens barrel according to claim 1, wherein the object side surface of the first lens is concave.

4. An optical lens as claimed in claim 1, characterized in that the second lens has a negative optical power.

5. An optical lens as claimed in claim 1, characterized in that the second lens has a positive optical power.

6. An optical lens as recited in claim 1, wherein the fourth lens element has a positive optical power and a convex image-side surface.

7. An optical lens as claimed in claim 1, characterized in that the fourth lens element has a negative optical power and a concave image-side surface.

8. An optical lens barrel according to claim 1, wherein the fifth lens element has a negative power and a concave object-side surface.

9. The optical lens assembly, in order from an object side to an image side along an optical axis, comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens;

the first lens has a negative optical power;

the third lens has positive optical power; and

the distance d8i between the center of the object side surface of the fourth lens element and the imaging surface of the optical lens on the optical axis and the distance TTL between the center of the object side surface of the first lens element and the imaging surface of the optical lens on the optical axis satisfy: d8i/TTL is more than or equal to 0.3.

10. An electronic apparatus, characterized by comprising the optical lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.