CN112859289B

CN112859289B - Optical lens and electronic device

Info

Publication number: CN112859289B
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: 2024-01-26
Anticipated expiration: 2039-11-28
Also published as: CN112859289A

Abstract

The application discloses an optical lens and electronic equipment comprising the same. The optical lens sequentially comprises, from an object side to an image side along an optical axis: the first lens is provided with 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 is provided with 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 element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; and a seventh lens having 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 beneficial effects of high resolution, low cost, miniaturization, ultra-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 have been widely used as key components of automatic driving assistance systems. Meanwhile, in order to meet the safety requirement of automatic driving, the requirements of the market on the wide-angle vehicle-mounted lens in the aspects of size, imaging, and the like are becoming higher and higher. Compared with a common optical lens, the vehicle-mounted lens in the automatic driving auxiliary system has higher performance standard requirements. For example, the front end caliber of the vehicle-mounted lens is as small as possible, the light transmission capacity is stronger, the vehicle-mounted lens can adapt to the brightness change of the external environment, and the requirements of high imaging definition and no ghost images in an intelligent driving system can be met. Therefore, there is a market demand for miniaturized and high definition imaging optical lenses.

Disclosure of Invention

An aspect of the present application provides an optical lens sequentially including, from an object side to an image side along an optical axis: the lens system 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 is provided with 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.

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

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

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

In one embodiment, the object side surface of the seventh lens is convex, and the image side surface 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 aspherical 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 from an object side surface of the first lens to 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 light passing 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 more than or equal to 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. Times.F)/H.gtoreq.50.

In one embodiment, the sagittal height SAG2 of the image side of the first lens and the maximum light transmitting half-diameter d2 of the image side of the first lens satisfy: arctan (SAG 2/d 2) is not less than 65.

In one embodiment, the temperature coefficient of refractive index (dn/dt) of the fourth lens ₄ The method meets the following conditions: -2.2X10 ^-5 ≤(dn/dt) ₄ ≤-0.8×10 ^-5 。

In one embodiment, the refractive index temperature coefficient (dn/dt) of the fifth lens ₅ The method meets the following conditions: -2.2X10 ^-5 ≤(dn/dt) ₅ ≤-0.8×10 ^-5 。

In one embodiment, a distance BFL on the optical axis from the image side surface of the seventh lens element to the imaging surface of the optical lens element and a distance TL on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element satisfy: BFL/TL is not less than 0.1 and not more than 0.3.

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

In one embodiment, the sagittal height SAG13 of the object side surface of the seventh lens and the maximum light-transmitting half-diameter d13 of the object side surface of the seventh lens satisfy: arctan (SAG 13/d 13) is less than or equal to 40.

In one 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.

In one embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis corresponds to the image height H of the maximum field angle of the optical lens, where the image height H is: TTL/H is less 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 application provides an optical lens sequentially including, 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, a sixth lens, and a seventh lens, the first lens having negative optical power; the second lens has negative optical power; the third lens has optical power; the fourth lens has positive focal power; the fifth lens has positive optical power; the sixth lens has negative focal 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 fourth lens has a refractive index temperature coefficient (dn/dt) ₄ The method meets the following conditions: -2.2X10 ^-5 ≤(dn/dt) ₄ ≤-0.8×10 ^-5 。

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

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

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

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

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

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

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

The seven lenses are adopted, and the shape, the focal power and the like of each lens are optimally arranged, so that the optical lens has at least one beneficial effect of high resolution, low cost, miniaturization, super-large field angle, long focus, small caliber, good temperature applicability 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, taken in conjunction with the accompanying drawings. In the drawings:

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

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

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

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

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

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

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

Fig. 8 is a schematic diagram showing the structure of an optical lens according to embodiment 8 of the present application;

fig. 9 is a schematic diagram showing the structure of 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 these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 subject is referred to as the object side of the lens, and the surface of each lens closest to the imaging side is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

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 power, 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 in order from the object side to the image side along the optical axis.

In an exemplary embodiment, the optical lens may further include a photosensitive element disposed at the imaging surface. 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 negative power and have a meniscus shape, an object-side surface thereof may be convex, and an image-side surface thereof may be concave. The focal power and the surface type configuration of the first lens are beneficial to collecting incident light rays with large field angles, and more light rays are ensured to smoothly enter the rear optical system, so that luminous flux is increased, and imaging quality is improved. In practical application, the vehicle-mounted lens is generally exposed in an external environment, and the meniscus lens protruding to the object side is favorable for 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 imaging of the lens is reduced.

The second lens element may have negative refractive power, and an object-side surface thereof may be convex while an image-side surface thereof is concave. The meniscus shape of the second lens protruding toward the object side is beneficial to collecting and compressing the light rays emitted by the first lens, so that the light rays are smoothly transited to the rear optical system. The concave surface on the image side of the second lens is beneficial to reducing the lens distance between the first lens and the second lens, reducing the light-transmitting caliber of the first lens, shortening the physical total length of the optical lens and realizing miniaturization.

The third lens element may have positive refractive power or negative refractive power, wherein the object-side surface thereof may be convex while the image-side surface thereof is concave, or the object-side surface and the image-side surface thereof may be convex, or the object-side surface thereof may be concave while the image-side surface thereof is convex. When the focal power of the third lens is positive, the third lens is beneficial to converging light, so that the diverging light smoothly enters the rear optical system, and the third lens is beneficial to compressing the light and stably transiting the trend of the light.

The fourth lens element may have positive optical power, and both the object-side and image-side surfaces thereof may be convex. The focal power of the fourth lens is positive, so that light is converged, the divergent light smoothly enters the rear optical system, the light is compressed, and the light trend is smoothly transited.

The fifth lens element may have positive optical power, and both the object-side and image-side surfaces thereof may be convex. The focal power of the fifth lens is positive, so that light is converged, the divergent light smoothly enters the rear optical system, the light is compressed, and the light trend is smoothly transited.

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

The seventh lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be concave, or both its object-side and image-side surfaces may be convex.

In an exemplary embodiment, a stop for limiting the light beam may be provided between the third lens and the fourth lens to further improve the imaging quality of the optical lens. The diaphragm is beneficial to effectively converging light rays entering the optical system, shortening the overall length of the system and reducing the caliber of the lens. In the present embodiment, a stop may be provided near the image side surface of the third lens. It should be noted, however, that the locations of the diaphragms disclosed herein are merely examples and not limiting; in alternative embodiments, the diaphragm may be arranged in other positions as desired.

In an exemplary embodiment, the optical lens according to the present application may further include a filter disposed between the seventh lens and the imaging 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 plane to prevent damage to an image Fang Yuanjian (e.g., a chip) of the optical lens.

As known to those skilled in the art, cemented lenses may be used to minimize chromatic aberration 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 procedure in the lens manufacturing process.

In an exemplary embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens. The fifth lens with the convex object side and the concave image side is glued with the sixth lens with the convex object side and the concave image side. The fifth lens and the sixth lens are glued to form a glued lens, which is beneficial to smoothly transferring the light rays 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 with each other. The fifth lens, the sixth lens and the seventh lens are mutually glued to form the three-cemented lens, which is beneficial to eliminating chromatic aberration through the three-cemented lens, reducing tolerance sensitivity and balancing system chromatic aberration through residual partial chromatic aberration. The bonding part consists of a biconvex lens with positive focal power, a biconcave lens with negative focal power and a meniscus lens with positive focal power. Wherein, the biconvex lens with focal power is in front, the biconcave lens with negative focal power is in the middle, and the meniscus lens with positive focal power is glued with each other at last, which is favorable for converging the front light and then transiting 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 a high refractive index and the lens with a low refractive index are matched with each other, so that the rapid transition of front light in the optical system is facilitated, the aperture of the diaphragm is increased, the light flux is improved, and the night vision requirement of the optical system is met. The adoption of the gluing mode between the lenses has at least one of the following advantages: reducing self chromatic aberration, reducing tolerance sensitivity, and balancing the overall chromatic aberration of the system through residual partial chromatic aberration; reducing the air separation between the two lenses, thereby reducing the overall length of the system; the number of assembly parts between lenses is reduced, so that the working procedures are reduced, the weight is reduced, and the cost is reduced; the tolerance sensitivity problems of the lens unit, such as inclination/core deflection and the like, generated in the assembly process are reduced, and the production yield is improved; the light quantity loss caused by reflection among lenses is reduced, and the illumination is improved; further reduces field curvature and effectively corrects off-axis aberrations of the optical lens. The gluing design shares the whole chromatic aberration correction of the system, effectively corrects the aberration, improves the resolution, ensures that the whole optical system is compact, and meets the miniaturization requirement.

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, 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, e.g., TTL/H/FOV is less than or equal to 0.03. The mutual relation among the three is reasonably arranged, so that miniaturization of the lens is facilitated, and 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 light passing 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 is less than or equal to 0.03, for example, D/H/FOV is less than or equal to 0.02. The interrelation among the three is reasonably arranged, so that the front end caliber of the optical lens is easy to be reduced, and the 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, e.g., 0.ltoreq.F1/F2.ltoreq.2. The proportional relation between the effective focal length of the first lens and the effective focal length of the second lens is reasonably set, so that the effective focal length of the second lens is close to the effective focal length of the first lens, smooth transition of light rays in the optical system is facilitated, aberration caused by large-angle light rays entering from 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 X F)/H.gtoreq.50, for example, (FOV X F)/H.gtoreq.55. The mutual relation of the three is reasonably arranged, so that the optical lens is beneficial to realizing large angle resolution and has the characteristics of large field angle and long focus.

In an exemplary embodiment, a sagittal height SAG2 of the image side of the first lens and a maximum light transmitting half-diameter d2 of the image side of the first lens satisfy: arctan (SAG 2/d 2) is.gtoreq.65, for example, arctan (SAG 2/d 2) is.gtoreq.70. The aperture angle of the maximum field angle corresponding to the image side surface of the first lens is reasonably set, so that the illumination of the optical system is improved, the distortion is reduced, and the optical lens is enabled to give consideration to the oversized field angle and the long focal length characteristic.

In an exemplary embodiment, the temperature coefficient of refractive index (dn/dt) of the fourth lens ₄ The method meets the following conditions: -2.2X10 ^-5 ≤(dn/dt) ₄ ≤-0.8×10 ^-5 For example, -2.1X10 ^-5 ≤(dn/dt) ₄ ≤-0.9×10 ^-5 . And the temperature coefficient of the refractive index of the fourth lens is reasonably set, so that the thermal compensation of the optical system is realized.

In an exemplary embodiment, the refractive index temperature coefficient (dn/dt) of the fifth lens ₅ The method meets the following conditions: -2.2X10 ^-5 ≤(dn/dt) ₅ ≤-0.8×10 ^-5 For example, -2.1X10 ^-5 ≤(dn/dt) ₅ ≤-0.9×10 ^-5 . And the refractive index temperature coefficient of the fifth lens is reasonably set, so that the thermal compensation of the optical system is realized.

In an exemplary embodiment, the distance BFL on the optical axis from the image side surface of the seventh lens element to the image plane of the optical lens element and the distance TL on the optical axis from the object side surface of the first lens element to the image side surface of the seventh lens element satisfy: BFL/TL 0.1.ltoreq.BFL 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 between the object side surface of the first lens element and the image side surface of the seventh lens element on the optical axis is also referred to as the lens group length of the optical lens assembly. And the back focal length of the optical system is reasonably set, so that ghost images can be eliminated. 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 the miniaturized module is facilitated. The length of the lens group of the optical lens is reasonably shortened, the optical lens is beneficial to being compact in structure, the sensitivity of the lens to MTF (Modulation Transfer Function ) is reduced, the production yield of the lens is improved, and the production cost is reduced.

In an exemplary embodiment, the radius of curvature R10 of the object side surface of the fifth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: (R10-R12)/(R10+R12) is.ltoreq.0.3, for example, (R10-R12)/(R10+R12) is.ltoreq.0.2. And the interrelationship of 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, so that the conditions are met, the object side surface of the fifth lens and the object side surface of the sixth lens are close to each other, and ghost images can be eliminated. Meanwhile, the flatter the surface shape is, the more favorable the elimination of system ghost images.

In an exemplary embodiment, the sagittal height SAG13 of the object side surface of the seventh lens and the maximum light transmitting half-diameter d13 of the object side surface of the seventh lens satisfy: arctan (SAG 13/d 13) is less than or equal to 40, for example, arctan (SAG 13/d 13) is less than or equal to 38. And the opening angle of the maximum field angle corresponding to the object side surface of the seventh lens is reasonably reduced, so that the system ghost images can be eliminated. Fig. 10 is a partial parameter diagram illustrating an optical lens according to an embodiment of the present application. The maximum light transmission half-aperture d of the object side surface of the lens is schematically shown in fig. 10; a sagittal height SAG of the object side of the lens is 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. And 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, so that the system resolution is improved.

In an exemplary embodiment, the distance TTL from the object side surface of the first lens element to the imaging surface of the optical lens element on the optical axis corresponds to the image height H of the maximum field angle of the optical lens element, which satisfies the following conditions: TTL/H is 3.10.ltoreq.TTL/H is 4.50.ltoreq.3.ltoreq.TTL/H is 4.4. And 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, so that 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, e.g.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 resolution of the 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 is.ltoreq.8, e.g.R3/R4 is.ltoreq.6. And 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 resolution of the optical system is facilitated.

In an exemplary embodiment, the refractive index Nd1 of the material used to fabricate the first lens satisfies: nd 1. Gtoreq.1.7, for example Nd 1. Gtoreq.1.75. The first lens is made of high-refractive-index materials, so that the front end caliber of the optical lens is reduced, and the imaging quality of the 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: the I F1/F I is not less than 2, for example, the I F1/F I is not less than 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 illuminance 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: the I F2/F I is not less than 1, for example, the I F2/F I is not less than 2. And 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, so that various aberrations in the optical system can be balanced.

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: the I F3/F I is not less than 2, for example, the I F3/F I is not less than 3. And 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, so that various aberrations in the optical system can be balanced.

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: the I F4/F I is not less than 1, for example, the I F4/F I is not less than 2. And 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, so that various aberrations in the optical system can be balanced.

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: the I F5/F I is not less than 1, for example, the I F5/F I is not less than 2. And 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, so that various aberrations in the optical system can be balanced.

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: the I F6/F I is not less than 0.5, for example, the I F6/F I is not less than 1. And 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, so that various aberrations in the optical system can be balanced.

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: F7/F1, e.g., F7/F2. And 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, so that various aberrations in the optical system can be balanced.

In an exemplary embodiment, the third lens, the fourth lens, and the seventh lens are all aspherical lenses. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, aberration generated during imaging can be eliminated as much as possible, and therefore imaging quality of the lens is improved. The arrangement of the aspheric lens is helpful for correcting system aberration and improving resolution. 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 reaching an imaging surface, correcting off-axis point aberration of an optical system, and optimizing optical performances such as distortion, CRA and the like.

In an exemplary embodiment, the first lens may be made of glass as an aspheric lens, which is beneficial to reducing the front end caliber 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 arrangement of the shape and the focal power of each lens, the aspheric surface is adopted to correct aberration including chromatic aberration, and in the case of using only 7 lenses, more than eight million pixels can be achieved, and higher definition is achieved. The optical lens has a longer focal length and a large angular resolution in a central region compared with a conventional wide-angle lens, so that the recognition degree of the lens on environmental objects is improved, and the detection area of the central part is increased pertinently.

Plastic lenses are generally used to achieve cost reduction and portability, but high plasticizing systems have poor thermal stability. The thermal expansion and contraction characteristics of the plastic lens are difficult to overcome, and the deviation of the resolution performance of the plastic lens at the high temperature and the low temperature of between 40 ℃ below zero and 120 ℃ is large, so that the whole lens is difficult to meet the existing severe temperature requirements and intelligent use requirements. The optical lens in the application can adopt an all-glass architecture. When the optical lens is applied to an automatic driving system, the optical lens has more stable thermal performance in a high-low temperature use environment, so that the safety of automatic driving can be greatly improved.

According to the optical lens of the embodiment of the application, the lens shape is optimally set, the focal power is reasonably distributed, the front end caliber of the optical system can be reduced, the overall length of the optical system is shortened, the miniaturization of the optical lens is ensured, and meanwhile, the resolution power is improved. Meanwhile, through reasonable collocation of lens curvature, lens spacing and back focal length, system ghost images are 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 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 is provided.

According to the optical lens of the embodiment of the application, the influence of the ghost image on the lens can be effectively eliminated by arranging the cemented lens, so that the lens has higher resolution on the basis of eliminating the ghost image.

In an exemplary embodiment, the fourth lens and the fifth lens may employ glass lenses, which are advantageous for compensating for an influence of temperature variation on a focal length of the optical lens, particularly an influence on a focal length of the wide-angle lens, and improving stability of resolving power of the optical lens under different temperature variations. Meanwhile, the optical lens made of glass can inhibit the shift of the back focus of the optical lens along with the change of temperature, so as to improve the stability of the system. Meanwhile, the adoption of the glass material can avoid the influence on the normal use of the lens due to the imaging blurring of the lens caused by the high and low temperature change in the use environment.

However, those skilled in the art will appreciate that the number of lenses making up a lens barrel may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, although seven lenses are described as an example 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 the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying 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 configuration 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with negative focal power, and its object-side surface S3 is a convex surface and its image-side surface S4 is a concave surface. The third lens element L3 has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a concave object-side surface S11 and a concave image-side surface S12, respectively, and has a negative refractive power. The seventh lens L7 is a meniscus lens with positive optical power, and the object side surface S12 is a convex surface and the image side surface S13 is a concave surface. The fifth lens L5, the sixth lens L6, and the seventh lens L7 are sequentially cemented with each other 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 imaging quality.

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

Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side surface S14 and an image side surface 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 image plane S16. 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 the radius of curvature R, thickness T (it is understood that the thickness T in the line of S1 is the center thickness of the first lens L1, the thickness T in the line of S2 is the air gap d12 between the first lens L1 and the second lens L2, and so on), refractive index Nd, and abbe number Vd of each lens of the optical lens of embodiment 1.

TABLE 1

In this embodiment, seven lenses are taken as an example, and by reasonably distributing the focal power and the surface shape 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 beneficial effects of high resolution, low cost, miniaturization, super-large field angle, long focus, small caliber, good temperature performance and the like. Each aspherical surface profile Z is defined by the following formula:

Wherein Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient conic; A. b, C, D, E, F are all high order coefficients. Table 2 below shows cone coefficients K and higher order coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S5, S6, S8, S9, and S13 in example 1.

Face number

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 portions similar to embodiment 1 will be omitted for brevity. Fig. 2 shows a schematic structural view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens 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.

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TABLE 3 Table 3

The cone coefficients K and the higher order 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 are given in table 4 below.

Face number

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 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 view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with negative focal power, and its object-side surface S3 is a convex surface and its image-side surface S4 is a concave surface. The third lens element L3 has a meniscus lens element with negative refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element L4 has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a concave object-side surface S11 and a concave image-side surface S12, respectively, and has a negative refractive power. The seventh lens L7 is a meniscus lens with positive optical power, and the object side surface S12 is a convex surface and the image side surface S13 is a concave surface. The fifth lens L5, the sixth lens L6, and the seventh lens L7 are sequentially cemented with each other 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

The cone coefficients K and the higher order 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 are given in table 6 below.

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 view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens 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.

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TABLE 7

The cone coefficients K and the higher order 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 are given in table 8 below.

Face number

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 view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with negative focal power, and its object-side surface S3 is a convex surface and its image-side surface S4 is a concave surface. The third lens element L3 has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a concave object-side surface S11 and a concave image-side surface S12, respectively, and has a negative refractive power. The seventh lens L7 is a meniscus lens with positive optical power, and has a convex object-side surface S13 and a concave image-side surface S14. The fifth lens L5 and the sixth lens L6 may be cemented to constitute cemented lenses.

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

Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side surface S15 and an image side surface 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 surface S17. 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 cone coefficients K and the higher order 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 are given in table 10 below.

Face number

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

Table 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 view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens 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 cone coefficients K and the higher order 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 are given in table 12 below.

Face number

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 view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with negative focal power, and its object-side surface S3 is a convex surface and its image-side surface S4 is a concave surface. The third lens element L3 has a positive refractive power, a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a concave object-side surface S11 and a concave image-side surface S12, respectively, and has a negative refractive power. The seventh lens L7 is a biconvex lens having positive optical 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 cemented lenses.

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.

TABLE 13

The cone coefficients K and the higher order 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 are given in table 14 below.

Face number

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 view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a meniscus lens with negative focal power, and its object-side surface S3 is a convex surface and its image-side surface S4 is a concave surface. The third lens element L3 has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a concave object-side surface S11 and a concave image-side surface S12, respectively, and has a negative refractive power. The seventh lens L7 is a biconvex lens having positive optical 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 sequentially cemented with each other 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.

TABLE 15

The cone coefficients K and the higher order 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 are given in table 16 below.

Face number

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 view 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 L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens 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 cone coefficients K and the higher order 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 are given in table 18 below.

Face number

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

TABLE 18

In summary, examples 1 to 9 each satisfy the relationship shown in table 19 below. In Table 19, F1, F2, F3, F4, F5, F6, F7, F56, TTL, H, F, D, BFL, TL, R1, R2, R3, R4, R10, R12 are in millimeters (mm), and FOV, arctan (SAG 2/d 2), arctan (SAG 13/d 13) are in degrees (°).

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TABLE 19

The application also provides an electronic device, which can comprise the optical lens and the imaging element for converting an optical image formed by the optical lens into an electric signal. The electronic device may be a stand-alone electronic device such as a detection range camera or may be an imaging module integrated with such a detection range device. The electronic device may also be a stand-alone imaging device, such as an onboard camera, or an imaging module integrated on, for example, a driving assistance system.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. An optical lens sequentially includes, from an object side to an image side along an optical axis: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens, its 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 is provided with 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 number of lenses with optical power in the optical lens is seven, and the fifth lens and the sixth lens are glued to form a glued lens;

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;

refractive index temperature coefficient (dn/dt) of the fifth lens ₅ The method meets the following conditions: -2.2X10 ^-5 ≤(dn/dt) ₅ ≤-0.8×10 ^-5 。

2. The optical lens of claim 1, wherein the third lens element has a convex object-side surface and a concave image-side surface.

3. The optical lens of claim 1, wherein the third lens element has a concave object-side surface and a convex image-side surface.

4. The optical lens of claim 1, wherein the third lens element has a convex object-side surface and a convex image-side surface.

5. The optical lens of claim 1, wherein the third lens has positive optical power.

6. The optical lens of claim 1, wherein the third lens has negative optical power.

7. The optical lens of claim 1, wherein the seventh lens element has a convex object-side surface and a concave image-side surface.

8. The optical lens of claim 1, wherein the seventh lens element has a convex object-side surface and a convex image-side surface.

9. The optical lens of claim 1, wherein the sixth lens and the seventh lens are cemented to form a cemented lens.

10. The optical lens of claim 1, wherein the third lens, the fourth lens, and the seventh lens are all aspheric lenses.

11. The optical lens of claim 1, wherein the fourth lens is a glass lens.

12. The optical lens of claim 1, wherein the fifth lens is a glass lens.

13. The optical lens according to any one of claims 1 to 12, wherein a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical lens, a maximum field angle FOV of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy:

(TTL*180°)/(H*FOV)≤7.2。

14. the optical lens according to any one of claims 1 to 12, wherein a maximum field angle FOV of the optical lens, a maximum light passing 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*180°)/(H*FOV)≤5.4。

15. The optical lens of any one of claims 1-12, wherein an effective focal length F1 of the first lens and an effective focal length F2 of the second lens satisfy:

F1/F2≥0。

16. the optical lens according to any one of claims 1-12, wherein a maximum field angle FOV of the optical lens, a total effective focal length F of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy:

(FOV×F)/H≥50°。

17. the optical lens of any of claims 1-12, wherein a sagittal height SAG2 of an image side of the first lens and a maximum clear half-caliber d2 of the image side of the first lens satisfy:

arctan(SAG2/d2)≥65°。

18. the optical lens according to any one of claims 1 to 12, wherein the fourth lens has a refractive index temperature coefficient (dn/dt) ₄ The method meets the following conditions:

-2.2×10 ^-5 ≤(dn/dt) ₄ ≤-0.8×10 ^-5 。

19. the optical lens system of any one of claims 1-12, wherein a distance BFL on the optical axis from an image side surface of the seventh lens element to an imaging surface of the optical lens element and a distance TL on the optical axis from an object side surface of the first lens element to an image side surface of the seventh lens element satisfy:

0.1≤BFL/TL≤0.3。

20. the optical lens system of any one of claims 1-12, wherein a radius of curvature R10 of an object-side surface of the fifth lens element and a radius of curvature R12 of an image-side surface of the sixth lens element satisfy:

(R10-R12)/(R10+R12)≤0.3。

21. The optical lens system of any of claims 1-12, wherein a sagittal height SAG13 of an object side of the seventh lens and a maximum clear half-bore d13 of the object side of the seventh lens satisfy:

arctan(SAG13/d13)≤40°。

22. the optical lens of any one of claims 1-12, wherein a combined focal length F56 of the fifth lens and sixth lens and a total effective focal length F of the optical lens satisfy:

5.2612<F56/F<12。

23. the optical lens according to any one of claims 1 to 12, wherein a distance TTL from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis corresponds to an image height H of a maximum field angle of the optical lens, which satisfies:

3.10≤TTL/H≤4.50。

24. the optical lens of any of claims 1-12, wherein a radius of curvature R1 of an object-side surface of the first lens and a radius of curvature R2 of an image-side surface of the first lens satisfy:

R1/R2≤4.1。

25. the optical lens of any of claims 1-12, wherein a radius of curvature R3 of an object-side surface of the second lens and a radius of curvature R4 of an image-side surface of the second lens satisfy:

R3/R4≤8。

26. an optical lens sequentially includes, from an object side to an image side along an optical axis: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens, its characterized in that:

The first lens has negative optical power;

the second lens has negative focal power, 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 fifth lens has positive optical power;

the sixth lens has negative focal power; and

the seventh lens has positive optical power;

the refractive index temperature coefficient (dn/dt) of the fourth lens ₄ The method meets the following conditions: -2.2X10 ^-5 ≤(dn/dt) ₄ ≤-0.8×10 ^-5 ；

27. The optical lens of claim 26, wherein the first lens element has a convex object-side surface and a concave image-side surface.

28. The optical lens of claim 26, wherein the object-side surface of the second lens is convex.

29. The optical lens of claim 26, wherein the third lens element has a convex object-side surface and a concave image-side surface.

30. The optical lens of claim 26, wherein the third lens element has a concave object-side surface and a convex image-side surface.

31. The optical lens of claim 26, wherein the third lens element has a convex object-side surface and a convex image-side surface.

32. The optical lens of claim 26 wherein the third lens has positive optical power.

33. The optical lens of claim 26 wherein the third lens has negative optical power.

34. The optical lens of claim 26, wherein the fourth lens element has a convex object-side surface and a convex image-side surface.

35. The optical lens of claim 26, wherein the fifth lens element has a convex object-side surface and a convex image-side surface.

36. The optical lens of claim 26, wherein the sixth lens element has a concave object-side surface and a concave image-side surface.

37. The optical lens of claim 26, wherein the seventh lens element has a convex object-side surface and a concave image-side surface.

38. The optical lens of claim 26, wherein the seventh lens element has a convex object-side surface and a convex image-side surface.

39. The optical lens of claim 26, wherein the sixth lens and the seventh lens are cemented to form a cemented lens.

40. The optical lens of claim 26, wherein the third lens, the fourth lens and the seventh lens are all aspheric lenses.

41. The optical lens of claim 26, wherein the fourth lens is a glass lens.

42. The optical lens of claim 26, wherein the fifth lens is a glass lens.

43. The optical lens of any of claims 26-42 wherein a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical lens, a maximum field angle FOV of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy:

(TTL*180°)/(H*FOV)≤7.2。

44. the optical lens of any of claims 26-42 wherein a maximum field angle FOV of the optical lens, a maximum light passing 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*180°)/(H*FOV)≤5.4。

45. the optical lens of any of claims 26-42 wherein an effective focal length F1 of the first lens and an effective focal length F2 of the second lens satisfy:

F1/F2≥0。

46. The optical lens of any of claims 26-42 wherein a maximum field angle FOV of the optical lens, a total effective focal length F of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy:

(FOV×F)/H≥50°。

47. the optical lens system of any of claims 26-42 wherein a sagittal height SAG2 of the image side of the first lens and a maximum clear half-bore d2 of the image side of the first lens satisfy:

arctan(SAG2/d2)≥65°。

48. the optical lens assembly of any one of claims 26-42, wherein a distance BFL between an image side surface of the seventh lens element and an imaging surface of the optical lens assembly and a distance TL between an object side surface of the first lens element and an image side surface of the seventh lens element on the optical axis satisfy:

0.1≤BFL/TL≤0.3。

49. the optical lens system of any of claims 26-42 wherein the radius of curvature R10 of the object-side surface of the fifth lens element and the radius of curvature R12 of the image-side surface of the sixth lens element satisfy:

(R10-R12)/(R10+R12)≤0.3。

50. the optical lens system of any of claims 26-42 wherein a sagittal height SAG13 of the object side of the seventh lens and a maximum clear half-bore d13 of the object side of the seventh lens satisfy:

arctan(SAG13/d13)≤40°。

51. The optical lens of any of claims 26-42 wherein a combined focal length F56 of the fifth lens and sixth lens and a total effective focal length F of the optical lens satisfy:

5.2612<F56/F<12。

52. the optical lens system of any of claims 26-42 wherein an image height H of an object-side surface of the first lens element on the optical axis from an imaging surface of the optical lens element corresponding to a maximum field angle of the optical lens element is:

3.10≤TTL/H≤4.50。

53. the optical lens of any of claims 26-42 wherein a radius of curvature R1 of an object-side surface of the first lens and a radius of curvature R2 of an image-side surface of the first lens satisfy:

R1/R2≤4.1。

54. the optical lens system of any of claims 26-42 wherein 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≤8。

55. an electronic device comprising the optical lens according to claim 1 or 25 and an imaging element for converting an optical image formed by the optical lens into an electric signal.