CN112859289A

CN112859289A - Optical lens and electronic device

Info

Publication number: CN112859289A
Application number: CN201911191184.3A
Authority: CN
Inventors: 王东方; 赵哲
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2021-05-28
Anticipated expiration: 2039-11-28
Also published as: CN112859289B

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: a first lens having a negative focal power, wherein the object-side surface is a convex surface and the image-side surface is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens having optical power; a fourth lens having positive focal power, wherein the object-side surface of the fourth lens is a convex surface, and the image-side surface of the fourth lens is a convex surface; a fifth lens element having positive focal power, wherein the object-side surface is convex and the image-side surface is convex; a sixth lens element having a negative focal power, wherein the object-side surface is a concave surface and the image-side surface is a concave surface; and a seventh lens having a positive optical power; wherein, the fifth lens and the sixth lens are cemented to form a cemented lens. The optical lens can realize at least one of the advantages of high resolution, low cost, miniaturization, super-large field angle, long focus, small caliber, good temperature applicability and the like.

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 rapid development of automatic driving assistance systems for automobiles in recent years, wide-angle vehicle-mounted lenses are widely used as key components of the automatic driving assistance systems. Meanwhile, in order to meet the safety requirement of automatic driving, the market demands for the wide-angle vehicle-mounted lens in terms of size, resolution and the like are becoming higher and higher. Compared with the common optical lens, the vehicle-mounted lens in the automatic driving assistance system has higher performance standard requirement. For example, the front end aperture of the vehicle-mounted lens is required to be as small as possible, the light transmission capability is higher, the vehicle-mounted lens can adapt to the change of brightness of the external environment, and the requirements of high imaging definition and no ghost image in an intelligent driving system can be met. Therefore, the market demands an optical lens that is miniaturized and has high-definition imaging.

Disclosure of Invention

An aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has optical power; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; and the seventh lens has a positive optical power; wherein the fifth lens and the sixth lens are cemented to form a cemented lens.

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 concave.

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

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

In one embodiment, the sixth lens and the seventh lens are cemented to form a cemented lens.

In one embodiment, the third lens, the fourth lens and the seventh lens are all aspheric lenses.

In one embodiment, the fourth lens is a glass lens.

In one embodiment, the fifth lens is a glass lens.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical lens on the optical axis, a maximum field angle FOV of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy: TTL/H/FOV is less than or equal to 0.04.

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

In one embodiment, the effective focal length F1 of the first lens and the effective focal length F2 of the second lens satisfy: F1/F2 is not less than 0.

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 FOV satisfy: (FOV F)/H.gtoreq.50.

In one embodiment, saga 2 of the image side surface of the first lens and the maximum clear half caliber d2 of the image side surface of the first lens satisfy: arctan (SAG2/d2) ≧ 65.

In one embodiment, the fourth lens has a temperature coefficient of refractive index (dn/dt)₄Satisfies the following conditions: -2.2X 10^-5≤(dn/dt)₄≤-0.8×10^-5。

In one embodiment, the temperature coefficient of refractive index (dn/dt) of the fifth lens₅Satisfies the following conditions: -2.2X 10^-5≤(dn/dt)₅≤-0.8×10^-5。

In one embodiment, a distance BFL between an image-side surface of the seventh lens element and an image plane of the optical lens system on the optical axis and a distance TL between an object-side surface of the first lens element and the image-side surface of the seventh lens element on the optical axis satisfy: BFL/TL is more than or equal to 0.1 and less than or equal to 0.3.

In one embodiment, a radius of curvature R10 of an object-side surface of the fifth lens and a radius of curvature R12 of an image-side surface of the sixth lens satisfy: (R10-R12)/(R10+ R12) is less than or equal to 0.3.

In one embodiment, the sago 13 of the object side surface of the seventh lens and the maximum clear half aperture d13 of the object side surface of the seventh lens satisfy: the arctan (SAG13/d13) is less than or equal to 40.

In one embodiment, a combined focal length F56 of the fifth and sixth lenses and a total effective focal length F of the optical lens satisfy: 2< F56/F < 12.

In one embodiment, a distance TTL between an object side surface of the first lens element and an image plane of the optical lens along the optical axis and an image height H corresponding to a maximum field angle of the optical lens satisfy: TTL/H is more than or equal to 3.10 and less than or equal to 4.50.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: R1/R2 is less than or equal to 4.1.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: R3/R4 is less than or equal to 8.

Another aspect of the present disclosure provides an optical lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, the first lens having a negative focal power; the second lens has a negative optical power; the third lens has optical power; the fourth lens has positive optical power; the fifth lens has positive focal power; the sixth lens has a negative optical power; and the seventh lens has a positive optical power; wherein the fifth lens and the sixth lensMirror cemented to form a cemented lens, and the temperature coefficient of refractive index (dn/dt) of said fourth lens₄Satisfies the following conditions: -2.2X 10^-5≤(dn/dt)₄≤-0.8×10^-5。

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

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

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

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

In one embodiment, the fourth lens is a glass lens.

In one embodiment, the fifth lens is a glass lens.

The optical lens has the beneficial effects of high resolution, low cost, miniaturization, super-large field angle, long focus, small caliber, good temperature applicability and the like by adopting the seven lenses and optimally setting the shape, focal power and the like of each lens.

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; and

fig. 10 is a partial parameter diagram illustrating an optical lens according to an embodiment 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, seven lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven 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).

The first lens may have a negative power and have a meniscus shape, its object side may be convex, and its image side may be concave. The focal power and the surface type configuration of the first lens are beneficial to collecting incident rays with a large field angle, and more rays are ensured to stably enter a rear optical system, so that the luminous flux is increased, and the imaging quality is improved. In practical application, the vehicle-mounted lens is generally exposed in an external environment, and the meniscus lens protruding towards the object side is beneficial to rain and snow to slide along the lens, so that the service life of the lens is prolonged, and the influence of rain and snow on lens imaging is reduced.

The second lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface. The meniscus shape of the second lens, which is convex to the object, is beneficial to collecting and compressing the light emitted by the first lens, so that the trend of the light is stably transited to the rear optical system. The image side surface of the second lens is a concave surface, so that the reduction of the lens distance between the first lens and the second lens is facilitated, the light transmission aperture of the first lens is reduced, the physical total length of the optical lens is shortened, and the miniaturization is realized.

The third lens element can have positive or negative power, and can have a convex object-side surface and a concave image-side surface, or both the object-side surface and the image-side surface can be convex, or the object-side surface can be concave and the image-side surface can be convex. When the focal power of the third lens is positive, the third lens is beneficial to light convergence, so that the diffused light can smoothly enter the rear optical system, and the third lens is beneficial to compressing the light and enabling the trend of the light to be in stable transition.

The fourth lens element can have a positive optical power, and both the object-side surface and the image-side surface can be convex. The focal power of the fourth lens is positive, which is beneficial to light convergence, enables the diffused light to smoothly enter the rear optical system, and is beneficial to compressing the light, so that the trend of the light is in stable transition.

The fifth lens element can have a positive optical power, and the object-side surface and the image-side surface of the fifth lens element can be convex at the same time. The focal power of the fifth lens is positive, which is beneficial to light convergence, enables the diffused light to smoothly enter a rear optical system, and is beneficial to light compression, and enables the light trend to be in stable transition.

The sixth lens element can have a negative optical power, and the object-side surface and the image-side surface can be concave at the same time.

The seventh lens element can have a positive optical power, can have a convex object-side surface and a concave image-side surface, or can have both a convex object-side surface and a convex image-side surface.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the third lens and the fourth lens to further improve the imaging quality of the optical lens. The diaphragm is beneficial to effectively collecting light rays entering the optical system, shortening the total length of the system and reducing the aperture of the lens. In the embodiment of the present application, the stop may be disposed in the vicinity of the image 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.

In an exemplary embodiment, the optical lens according to the present application may further include a filter disposed between the seventh lens and the image plane to filter light rays having different wavelengths, as needed. The optical lens according to the present application may further include a protective glass disposed between the seventh lens and the imaging surface to 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 use of the cemented lens in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby 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 fifth lens and the sixth lens are cemented to form a cemented lens. And the fifth lens with convex object-side and image-side surfaces is cemented with the sixth lens with concave object-side and image-side surfaces. The fifth lens and the sixth lens are glued to form the cemented lens, which is beneficial to smoothly transition the light emitted by the fourth lens to an imaging surface, reducing the total length of the optical system and correcting various aberrations of the optical system.

In an exemplary embodiment, the fifth lens, the sixth lens, and the seventh lens may be sequentially cemented to each other. The fifth lens, the sixth lens and the seventh lens are combined into the tri-cemented lens through phase cementing, which is not only beneficial to eliminating chromatic aberration through the tri-cemented lens and reducing tolerance sensitivity, but also beneficial to balancing system chromatic aberration through residual partial chromatic aberration. The adhesive member is composed of a biconvex lens with positive focal power, a biconcave lens with negative focal power and a meniscus lens with positive focal power. The double convex lens with focal power is arranged in the front, the double concave lens with negative focal power is arranged in the middle, and the meniscus lenses with positive focal power are finally glued with each other, so that the front light is converged and then transited to the rear optical system. The positive focal power lens can be made of a material with a lower refractive index, the negative focal power lens can be made of a material with a higher refractive index (relative to the positive lens), and the lens with the high refractive index and the lens with the low refractive index are matched with each other, so that the rapid transition of front light in an optical system is facilitated, the aperture of a diaphragm is increased, the light transmission amount is improved, and the night vision requirement of the optical system is met. The gluing mode adopted between the lenses has at least one of the following advantages: self color difference is reduced, tolerance sensitivity is reduced, and the integral color difference of the system is balanced through the residual partial color difference; reducing the air space 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, the weight is 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 light quantity loss caused by reflection among the lenses is reduced, and the illumination is improved; further reducing the curvature of field and effectively correcting the off-axis point aberration of the optical lens. The gluing design shares the whole chromatic aberration correction of the system, effectively corrects the aberration so as to improve the resolving power, and enables the optical system to be compact as a whole and meet the miniaturization requirement.

In an exemplary embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle FOV satisfy: TTL/H/FOV ≦ 0.04, e.g., TTL/H/FOV ≦ 0.03. The mutual relation among the three is reasonably set, which is beneficial to realizing the miniaturization of the lens, so that the optical system has smaller lens size under the condition of the same imaging surface and the same image height.

In an exemplary 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 FOV, and the image height H corresponding to the maximum field angle FOV satisfy: D/H/FOV ≦ 0.03, for example, D/H/FOV ≦ 0.02. The mutual relation among the three is reasonably set, the front end caliber of the optical lens is easy to reduce, and miniaturization is realized.

In an exemplary embodiment, the effective focal length F1 of the first lens and the effective focal length F2 of the second lens satisfy: F1/F2. gtoreq.0, for example, 0. ltoreq.F 1/F2. ltoreq.2. The effective focal length of the first lens and the effective focal length of the second lens are reasonably set to be close to the effective focal length of the first lens, so that smooth transition of light in the optical system is facilitated, aberration caused by large-angle light entering the first lens is reduced, and imaging quality of the optical system is improved.

In an exemplary 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 FOV satisfy: (FOV F)/H.gtoreq.50, for example, (FOV F)/H.gtoreq.55. The mutual relation of the three is reasonably set, so that the optical lens has large field angle and long focus characteristics while realizing large-angle resolution.

In an exemplary embodiment, saga 2 of the image side surface of the first lens and the maximum clear half caliber d2 of the image side surface of the first lens satisfy: arctan (SAG2/d2) ≧ 65, for example, arctan (SAG2/d2) ≧ 70. The field angle of the maximum field angle corresponding to the image side surface of the first lens is reasonably set, so that the illumination of an optical system is favorably improved, the distortion is reduced, and the optical lens is favorably enabled to have both an ultra-large field angle and a telephoto characteristic.

In an exemplary embodiment, the fourth lens has a temperature coefficient of refractive index (dn/dt)₄Satisfies the following conditions: -2.2X 10^-5≤(dn/dt)₄≤-0.8×10^-5For example, -2.1X 10^-5≤(dn/dt)₄≤-0.9×10^-5. The temperature coefficient of the refractive index of the fourth lens is reasonably set, and thermal compensation of the optical system is facilitated.

In an exemplary embodiment, a temperature coefficient of refractive index (dn/dt) of the fifth lens₅Satisfies the following conditions: -2.2X 10^-5≤(dn/dt)₅≤-0.8×10^-5For example, -2.1X 10^-5≤(dn/dt)₅≤-0.9×10^-5. The temperature coefficient of the refractive index of the fifth lens is reasonably set, and thermal compensation of an optical system is facilitated.

In an exemplary embodiment, a distance BFL on the optical axis from the image-side surface of the seventh lens to the imaging surface of the optical lens and a distance TL on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens satisfy: 0.1. ltoreq. BFL/TL. ltoreq.0.3, e.g., 0.12. ltoreq. BFL/TL. ltoreq.0.28. In the present application, the distance on the optical axis from the image-side surface of the seventh lens to the imaging surface of the optical lens is also referred to as the back focal length of the optical lens; the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens is also referred to as the lens group length of the optical lens. The rear focal length of the optical system is reasonably set, which is beneficial to eliminating ghost images. The proportional relation between the back focal length of the optical lens and the length of the lens group of the optical lens is reasonably controlled, and the assembly of a miniaturized module is facilitated. The length of the lens group of the optical lens is reasonably shortened, so that the structure of the optical lens is compact, the sensitivity of the lens to Modulation Transfer Function (MTF) is reduced, the production yield of the lens is improved, and the production cost is reduced.

In an exemplary embodiment, a radius of curvature R10 of the object-side surface of the fifth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: (R10-R12)/(R10+ R12). ltoreq.0.3, for example, (R10-R12)/(R10+ R12). ltoreq.0.2. The mutual relation between the curvature radius of the object side surface of the fifth lens and the curvature radius of the object side surface of the sixth lens is reasonably set to enable the mutual relation to meet the conditions, the surface shapes of the object side surface of the fifth lens and the object side surface of the sixth lens are enabled to be close, and ghost images are eliminated. Meanwhile, the flatter the surface shape is, the better the system ghost image is eliminated.

In an exemplary embodiment, the sago 13 of the object side surface of the seventh lens and the maximum clear half aperture d13 of the object side surface of the seventh lens satisfy: arctan (SAG13/d13) ≦ 40, for example, arctan (SAG13/d13) ≦ 38. And the field angle of the maximum field angle corresponding to the object side surface of the seventh lens is reasonably reduced, so that the ghost image of the system is favorably eliminated. Fig. 10 is a partial parameter diagram illustrating an optical lens according to an embodiment of the present application. The maximum clear half-aperture d of the object-side surface of the lens is schematically shown in fig. 10; the saggital SAG of the object side of the lens is schematically shown in fig. 10.

In an exemplary embodiment, the combined focal length F56 of the fifth lens and the sixth lens and the total effective focal length F of the optical lens satisfy: 2< F56/F <12, e.g., 2.2< F56/F < 11.8. The proportional relation between the combined focal length of the fifth lens and the sixth lens and the total effective focal length of the optical lens is reasonably set, and the improvement of the resolution of the system is facilitated.

In an exemplary embodiment, a distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens to the image height H corresponding to the maximum field angle of the optical lens satisfies: 3.10 ≦ TTL/H ≦ 4.50, e.g., 3 ≦ TTL/H ≦ 4.4. The proportional relation between the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the image height corresponding to the maximum field angle of the optical lens is reasonably set, and the miniaturization of the lens is facilitated.

In an exemplary embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: R1/R2. ltoreq.4.1, for example, R1/R2. ltoreq.4. The proportional relation between the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens is reasonably set, so that the first lens meets the special shape setting, and the improvement of the resolving power of an optical system is facilitated.

In an exemplary embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: R3/R4. ltoreq.8, for example, R3/R4. ltoreq.6. The proportional relation between the curvature radius of the object side surface of the second lens and the curvature radius of the image side surface of the second lens is reasonably set, so that the second lens meets the special shape setting, and the improvement of the resolving power of an optical system is facilitated.

In an exemplary embodiment, the refractive index Nd1 of the material used to make the first lens satisfies: nd 1. gtoreq.1.7, for example Nd 1. gtoreq.1.75. The first lens is made of a high-refractive-index material, so that the front end caliber of the optical lens is reduced, and the imaging quality of an optical system is improved.

In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: i F1/F | ≧ 2, for example, | F1/F | ≧ 3. The proportional relation between the effective focal length of the first lens and the total effective focal length of the optical lens is reasonably set, so that more light rays can smoothly enter the optical system, and the illumination of the optical system is improved.

In an exemplary embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: i F2/F | ≧ 1, e.g., | F2/F | ≧ 2. The proportional relation between the effective focal length of the second lens and the total effective focal length of the optical lens is reasonably set, and the balance of various aberrations in the optical system is facilitated.

In an exemplary embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: i F3/F | ≧ 2, for example, | F3/F | ≧ 3. The proportional relation between the effective focal length of the third lens and the total effective focal length of the optical lens is reasonably set, and the balance of various aberrations in the optical system is facilitated.

In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: i F4/F | ≧ 1, e.g., | F4/F | ≧ 2. The proportional relation between the effective focal length of the fourth lens and the total effective focal length of the optical lens is reasonably set, and the balance of various aberrations in the optical system is facilitated.

In an exemplary embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy: i F5/F | ≧ 1, e.g., | F5/F | ≧ 2. The proportional relation between the effective focal length of the fifth lens and the total effective focal length of the optical lens is reasonably set, and the balance of various aberrations in the optical system is facilitated.

In an exemplary embodiment, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: i F6/F | ≧ 0.5, e.g., | F6/F | ≧ 1. The proportional relation between the effective focal length of the sixth lens and the total effective focal length of the optical lens is reasonably set, and the balance of various aberrations in the optical system is facilitated.

In an exemplary embodiment, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: i F7/F | ≧ 1, e.g., | F7/F | ≧ 2. The proportional relation between the effective focal length of the seventh lens and the total effective focal length of the optical lens is reasonably set, and the balance of various aberrations in the optical system is facilitated.

In an exemplary embodiment, the third lens, the fourth lens, and the seventh lens are all 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. In this embodiment, the third lens, the fourth lens and the seventh lens are aspheric lenses, which is beneficial to improving the resolution quality of the optical system. The third lens adopts an aspheric lens, which is beneficial to reducing the optical path of peripheral light rays reaching an imaging surface, correcting the off-axis point aberration of the optical system, and optimizing the optical performances such as distortion, CRA and the like.

In an exemplary embodiment, the first lens can be made of glass and made into an aspheric lens, which is beneficial to reducing the front end aperture of the optical system and improving the imaging quality of the optical system.

According to the optical lens of the embodiment of the application, through reasonable setting of the shapes and focal powers of all the lenses, the aspheric surface is adopted to correct aberration including chromatic aberration, and under the condition that only 7 lenses are used, more than eight million pixels can be achieved, so that higher definition is achieved. Compared with a conventional wide-angle lens, the optical lens has a longer focal length and a large-angle resolution in the central area, so that the recognition degree of the lens on an environmental object is improved, and the detection area of the central part is increased in a targeted manner.

Generally, plastic lenses are used to achieve the effects of reducing cost and lightening weight, but the thermal stability of a high-plasticizing system is poor. The expansion and contraction characteristics of the plastic lens are difficult to overcome, which causes great deviation of the image resolving performance of the plastic lens at the high and low temperatures of-40 ℃ to 120 ℃, so that the whole lens is difficult to meet the existing increasingly severe temperature requirement and intelligent use requirement. The optical lens in the present application may employ an all-glass architecture. When the optical lens is applied to an automatic driving system, the optical lens has more stable thermal performance under high and low temperature use environments, so that the safety of automatic driving can be greatly improved.

According to the optical lens of the above embodiment of the present application, the shape of the lens is optimally set, the focal power is reasonably distributed, the front end aperture of the optical system can be reduced, the total length of the optical system is shortened, and the resolution is improved while the miniaturization of the optical lens is ensured. Meanwhile, by reasonably matching the curvature of the lens, the distance between the lenses and the back focal length, the ghost image of the system is eliminated. The optical lens can also have an ultra-large view field angle, the maximum view field angle can reach more than 180 degrees, and the optical lens has at least one of the performances of miniaturization, high resolution requirement, no ghost image and no large deviation of resolution power at high and low temperatures.

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 lens can be effectively eliminated, and the lens has higher resolving power on the basis of eliminating the ghost image.

In an exemplary embodiment, the fourth lens and the fifth lens may be glass lenses, which is beneficial to compensate the influence of temperature change on the focal length of the optical lens, especially on the focal length of the wide-angle lens, and improve the stability of the resolving power of the optical lens under different temperature changes. Meanwhile, 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.

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 seven lenses are exemplified in the embodiment, the optical lens is not limited to include seven 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 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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. 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 seventh lens L7 is a meniscus lens with positive power, with the object side S12 being convex and the image side S13 being concave. The fifth lens L5, the sixth lens L6, and the seventh lens L7 are cemented with one another in this order 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.

In the present embodiment, both the object-side and image-side surfaces of the third lens L3 and the fourth lens L4, and the image-side surface of the seventh lens L7 may be aspheric.

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

Table 1 shows a radius of curvature R, a thickness T (it is understood that the thickness T of the row in which S1 is located is the center thickness of the first lens L1, the thickness T of the row in which S2 is located is the air interval d12 between the first lens L1 and the second lens L2, and so on), a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1.

TABLE 1

The present embodiment adopts seven lenses as an example, and by reasonably distributing the focal power and the surface type of each lens, the center thickness of each lens and the air space between each lens, the lens can have at least one of the advantages of high resolution, low cost, miniaturization, super-large field angle, long focus, small caliber, good temperature performance and the like. Each aspherical surface type Z is defined by the following formula:

wherein Z is the distance rise from the vertex of the aspheric surface 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 the conic coefficient conc; A. b, C, D, E, F are all high order term coefficients. Table 2 below shows conic coefficients K and high-order term coefficients A, B, C, D and E of the aspherical lens surfaces S5, S6, S8, S9, and S13 usable in example 1.

Flour mark

K

A

B

C

D

E

S5

-8.5217

-4.4582E-04

1.6117E-05

-7.8997E-07

1.2501E-07

-2.8170E-09

S6

1.2335

-4.6707E-04

8.9626E-05

1.2813E-07

1.8867E-08

2.1072E-08

S8

-17.2209

-2.6489E-03

7.6054E-06

-8.8960E-06

7.7865E-07

-6.1173E-08

S9

1.6369

-6.9198E-04

-4.9579E-05

-1.3475E-06

1.8915E-07

-2.2783E-08

S13

0.1366

2.3172E-03

-3.2250E-05

5.8593E-06

-6.3496E-07

1.3721E-08

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, a sixth lens element L6, and a seventh lens element L7.

Table 3 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2.

TABLE 3

Table 4 below gives the conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9, and S13 in example 2.

Flour mark

K

A

B

C

D

E

S5

-30.5855

-4.8751E-04

1.9351E-05

-4.5907E-07

1.3111E-07

-2.8170E-09

S6

11.7011

-5.1744E-04

8.8330E-05

2.9790E-07

-2.0215E-08

2.1072E-08

S8

-20.2828

-1.2703E-03

4.9908E-06

-8.7152E-06

7.5745E-07

-6.1173E-08

S9

1.6727

-7.0057E-04

-2.0638E-05

-1.5935E-06

2.1112E-07

-2.2783E-08

S13

0.2549

-2.6590E-03

-9.1517E-05

5.8143E-06

-5.1028E-07

1.3721E-08

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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens L3 is a meniscus lens with negative power, with the object side S5 being convex and the image side S6 being concave. 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. 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 seventh lens L7 is a meniscus lens with positive power, with the object side S12 being convex and the image side S13 being concave. The fifth lens L5, the sixth lens L6, and the seventh lens L7 are cemented with one another in this order to constitute a cemented lens.

Table 5 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3.

TABLE 5

Table 6 below gives the conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9, and S13 in example 3.

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, a sixth lens element L6, and a seventh lens element L7.

Table 7 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4.

TABLE 7

Table 8 below gives the conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9, and S13 in example 4.

Flour mark

K

A

B

C

D

E

S5

13.2471

-9.1571E-04

2.6799E-05

-2.1281E-06

1.7030E-07

-2.8170E-09

S6

-73.5620

-1.1191E-03

1.0268E-04

4.3304E-07

9.9415E-08

2.1072E-08

S8

-11.1045

-6.4227E-04

4.4284E-05

-1.2064E-05

1.3670E-06

-6.1173E-08

S9

1.0409

-1.4319E-04

-3.1688E-05

-4.1510E-06

4.1491E-07

-2.2783E-08

S13

-8.5941

-2.1297E-03

-1.5244E-05

7.9020E-06

5.3418E-07

1.3721E-08

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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. 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 seventh lens L7 is a meniscus lens with positive power, with the object side S13 being convex and the image side S14 being concave. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

In the present embodiment, the object-side and image-side surfaces of the third lens L3, the fourth lens L4, and the seventh lens L7 may each be aspheric.

Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side S15 and an image side S16, the filter L8 may be used to correct color deviation and 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 9 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5.

TABLE 9

The following table 10 gives the conic coefficients K and high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9, S13 and S14 in example 5.

Flour mark

K

A

B

C

D

E

S5

-41.2161

-5.4288E-04

4.3340E-06

-4.7138E-07

8.6777E-08

-1.9507E-09

S6

-21.8430

-4.5083E-04

9.5401E-05

-2.6893E-07

1.2740E-07

2.1072E-08

S8

-16.7654

-1.1230E-03

3.2302E-05

-7.9212E-06

8.3475E-07

-6.1173E-08

S9

1.3864

4.5252E-04

-1.3838E-05

1.6985E-06

-2.1850E-07

-2.2783E-08

S13

-0.2377

9.6280E-05

-2.4290E-07

2.7662E-06

-4.0039E-09

7.7225E-22

S14

21.6555

1.6247E-03

-4.6618E-05

2.7891E-06

-5.5822E-07

1.3721E-08

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, a sixth lens element L6, and a seventh lens element L7.

Table 11 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 6.

TABLE 11

The following table 12 gives the conic coefficients K and high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9, S13 and S14 in example 6.

Flour mark

K

A

B

C

D

E

S5

-49.2753

-5.4775E-04

7.2051E-06

-9.5395E-08

1.0762E-07

-1.9507E-09

S6

-16.6802

-4.9129E-04

9.2317E-05

-5.8440E-08

1.5515E-07

2.1072E-08

S8

-16.3794

-1.1136E-03

3.5566E-05

-7.7157E-06

8.0742E-07

-6.1173E-08

S9

1.3659

4.3689E-04

-1.1989E-05

1.6757E-06

-2.1172E-07

2.2783E-08

S13

-0.2017

8.3261E-05

-3.1825E-07

3.0059E-06

-1.1100E-07

4.1286E-22

S14

42.9998

1.6609E-03

-4.3406E-05

2.3246E-06

-5.8175E-07

1.3721E-08

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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens L3 is a meniscus lens with positive power, with the object side S5 being concave and the image side S6 being convex. 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. 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 seventh lens element L7 is a biconvex lens with positive refractive power, and has a convex object-side surface S13 and a convex image-side surface S14. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 13 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 7.

Watch 13

The following table 14 gives the conic coefficients K and high-order term coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S5, S6, S8, S9, S13 and S14 in example 7.

Flour mark

K

A

B

C

D

E

F

S5

-11.1707

-1.3220E-03

-1.5968E-05

-8.5259E-07

-4.5281E-09

-1.9653E-09

-1.6E-11

S6

1.5941

-1.8287E-04

6.6823E-06

9.6350E-07

-6.8051E-08

2.6675E-09

1.91E-13

S8

-6.9235

-1.5937E-03

1.8528E-05

-2.0882E-05

2.8409E-06

-3.2031E-07

1.48E-08

S9

1.0882

-7.4869E-04

1.4804E-05

-5.8716E-06

4.7356E-07

-4.9642E-08

1.78E-09

S13

-1.2074

-2.1204E-03

-9.9864E-05

1.4882E-05

1.0190E-06

-3.4022E-08

4.76E-10

S14

99.0000

-4.1675E-04

1.4549E-05

2.2217E-06

-4.4525E-07

2.6071E-08

7.86E-11

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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. 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 seventh lens element L7 is a biconvex lens with positive refractive power, and has a convex object-side surface S12 and a convex image-side surface S13. The fifth lens L5, the sixth lens L6, and the seventh lens L7 are cemented with one another in this order to constitute a cemented lens.

Table 15 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 8.

Watch 15

The following table 16 gives the conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9, and S13 in example 8.

Flour mark

K

A

B

C

D

E

S5

100.0000

-1.2073E-04

2.5834E-05

-5.5701E-07

1.3734E-07

-2.8170E-09

S6

-4.2186

-4.5135E-04

8.5376E-05

-1.8087E-06

-4.6340E-08

2.1072E-08

S8

-20.5123

-1.2396E-03

1.0796E-05

-9.3313E-06

6.6884E-07

-6.1173E-08

S9

1.4399

-4.6934E-04

3.6729E-05

-2.2922E-06

1.9331E-07

-2.2783E-08

S13

-46.2355

-1.5884E-03

1.7332E-05

6.8924E-06

-3.1257E-07

1.3721E-08

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, a sixth lens element L6, and a seventh lens element L7.

Table 17 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 9.

TABLE 17

The following table 18 gives the conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9 and S13 in example 9.

Flour mark

K

A

B

C

D

E

S5

69.9331

-1.6547E-04

2.9262E-05

-3.2987E-07

1.3172E-07

-2.8170E-09

S6

-3.2923

-4.6513E-04

8.8367E-05

-1.3174E-06

6.5700E-08

2.1072E-08

S8

-21.3821

-1.2704E-03

5.7111E-06

-9.0583E-06

8.6263E-07

-6.1173E-08

S9

1.4716

-4.9303E-04

3.5548E-05

-2.1390E-06

2.4457E-07

-2.2783E-08

S13

-48.4622

-1.5027E-03

1.3476E-05

6.0264E-06

-3.6442E-07

1.3721E-08

Watch 18

In summary, examples 1 to 9 each satisfy the relationship shown in table 19 below. In table 19, units of F1, F2, F3, F4, F5, F6, F7, F56, TTL, H, F, D, BFL, TL, R1, R2, R3, R4, R10, R12 are millimeters (mm), and units of FOV, arctan (SAG2/D2), arctan (SAG13/D13) are degrees (°).

Watch 19

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

the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

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

the third lens has optical power;

the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;

the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;

the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; and

the seventh lens has positive optical power;

wherein the fifth lens and the sixth lens are cemented to form a cemented lens.

2. An optical lens barrel according to claim 1, wherein the third lens element has a convex object-side surface and a concave image-side surface.

3. An optical lens barrel according to claim 1, wherein the third lens element has a concave object-side surface and a convex image-side surface.

4. An optical lens barrel according to claim 1, wherein the third lens element has a convex object-side surface and a convex image-side surface.

5. An optical lens barrel according to claim 1, wherein the seventh lens element has a convex object-side surface and a concave image-side surface.

6. An optical lens barrel according to claim 1, wherein the seventh lens element has a convex object-side surface and a convex image-side surface.

7. An optical lens according to claim 1, wherein the sixth lens and the seventh lens are cemented to form a cemented lens.

8. An optical lens according to claim 1, wherein the third lens, the fourth lens and the seventh lens are all aspherical lenses.

9. An optical lens, in order from an object side to an image side along an optical axis, comprising: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens, characterized in that:

the first lens has a negative optical power;

the second lens has a negative optical power;

the third lens has optical power;

the fourth lens has positive optical power;

the fifth lens has positive focal power;

the sixth lens has a negative optical power; and

the seventh lens has positive optical power;

wherein the fifth lens and the sixth lens are cemented to form a cemented lens, and the temperature coefficient of refractive index (dn/dt) of the fourth lens₄Satisfies the following conditions:

-2.2×10^-5≤(dn/dt)₄≤-0.8×10^-5。

10. an electronic apparatus characterized by comprising the optical lens according to claim 1 or 9 and an imaging element for converting an optical image formed by the optical lens into an electric signal.