CN112987230A

CN112987230A - Optical lens and electronic device

Info

Publication number: CN112987230A
Application number: CN201911211775.2A
Authority: CN
Inventors: 王东方; 章鲁栋
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2021-06-18

Abstract

The application discloses an optical lens and an electronic device including the same. The optical lens sequentially comprises a first lens from an object side to an image side along an optical axis, 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; a second lens having a focal power, wherein the object-side surface of the second lens is a concave surface, and the image-side surface of the second lens is a convex surface; a third lens having a focal power, wherein the object-side surface of the third lens is convex, and the image-side surface of the third lens is convex; a fourth lens having optical power; a fifth lens element having positive refractive power, the object-side surface of which is convex, and the image-side surface of which is convex; a sixth lens having a negative optical power; and a seventh lens having positive optical power. The optical lens can realize at least one of the advantages of high resolution, low cost, miniaturization, small caliber, small CRA, good temperature performance 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

Optical lenses are important imaging optical elements and have important applications in many fields. For example, in recent years, with the rapid development of an automobile driving assistance system, the application of an optical lens to an automobile has become more and more widespread. The image information collected by the optical lens can be used as important decision data of an automobile auxiliary driving system (even an automatic driving system). For safety driving, the market demands for performance of optical lenses for use in automotive driving assistance systems or automotive automatic driving systems are also increasing. In this context, the importance of the characteristics of the optical lens such as imaging quality, degree of miniaturization, or temperature stability is also increasing.

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 concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has optical power; 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 convex surface; and the seventh lens has a positive optical power.

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

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 concave.

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

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

In one embodiment, the seventh lens element has a concave object-side surface and a convex 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 fifth lens and the sixth lens are cemented to form a cemented lens.

In one embodiment, the first lens is an aspheric lens.

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

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: the ratio of R3 to R4 is less than or equal to 15.

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 and a total effective focal length F of the optical lens satisfy: TTL/F is less than or equal to 9.

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 0.06.

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 0.025.

In one embodiment, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy: the absolute value of F5/F6 is more than or equal to 0.1 and less than or equal to 1.6.

In one embodiment, a maximum value p in a ratio of center thicknesses of any two lenses of the first lens to the seventh lens on the optical axis satisfies: p is more than or equal to 2 and less than or equal to 8.

In one embodiment, a radius of curvature R13 of an object-side surface of the seventh lens and a radius of curvature R14 of an image-side surface of the seventh lens satisfy: the ratio of R13 to R14 is less than or equal to 15.

In one embodiment, a combined focal length F56 of the fifth lens and the sixth lens and a total effective focal length F of the optical lens satisfy: the absolute value of F56/F is more than or equal to 3 and less than or equal to 10.

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, 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: not more than 0.02 (R3-R4)/(R3+ R4) not more than 0.4.

In one embodiment, the total effective focal length F of the optical lens and the radius of curvature R1 of the object side surface of the first lens satisfy: the | F/R1| is less than or equal to 1.5.

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 30.

In one embodiment, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: F/H is less than or equal to 3.

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 positive optical power; the fourth lens has 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 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 is less than or equal to 30.

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 concave and the image-side surface of the second 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 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 convex.

In one embodiment, the first lens is an aspheric lens.

The optical lens has the beneficial effects of high resolution, low cost, miniaturization, small caliber, small CRA, good temperature performance 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; and

fig. 5 is a schematic view showing a structure of an optical lens according to embodiment 5 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 optical power and the surface type configuration of the first lens are beneficial to collecting incident rays with a large field angle, so that more rays can smoothly enter a rear optical system, the luminous flux is increased, and the imaging quality of the optical system 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 adverse effect of rain and snow on lens imaging is reduced.

The second lens element can have a negative power, and can have a concave object-side surface and a convex image-side surface. The focal power and the surface type configuration of the second lens are beneficial to smooth entering of light rays into the rear optical system and improvement of the image resolution quality of the optical system, and are also beneficial to collection of more incident light rays with large field angles, so that the incident light rays enter the rear optical system and the luminous flux is increased.

The third lens element can have a positive optical power, and the object-side surface and the image-side surface of the third lens element can be convex at the same time. The focal power of the third lens is positive, which is not only beneficial to light convergence, and the caliber and the length of the optical lens barrel are reduced, but also beneficial to realizing the miniaturization of the lens.

The fourth lens element can have a positive or negative power and can have a concave object-side surface and a convex image-side surface, or can have a convex object-side surface and a concave image-side surface, or can have both an object-side surface and an image-side surface that are concave. The fourth lens is arranged in the optical system, so that the aberration generated by the front lens group is favorably corrected, the light beams are favorably converged, the aperture of the lens is enlarged, the structure of the optical system is more compact, the total length of the lens is shortened, and the optical system has relatively short total length.

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 sixth lens element can have a negative power and can have a concave object-side surface and a convex image-side surface.

The seventh lens element can have positive optical power, and can have a convex object-side surface and a concave image-side surface, or can have a concave object-side surface and a convex image-side surface, or can have both an object-side surface and an image-side surface that are convex. The power and the surface type configuration of the seventh lens are beneficial to enabling the front light trend to become gentle, reducing the CRA and improving the system image resolution quality.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the second lens and the third lens to further improve the imaging quality of the optical lens. The diaphragm is 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 second lens or in the vicinity of the object side surface of the third lens. It should be noted, however, that the positions of the diaphragms disclosed herein are merely examples and not limitations; in alternative embodiments, the diaphragm may be disposed at other positions according to actual needs.

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. The fifth lens and the sixth lens are concave, the object side surface and the image side surface are convex, the sixth lens is convex, the light emitted by the fourth lens is smoothly transited to the imaging surface, the total length of the optical system is reduced, various aberrations of the optical system are corrected, and the optical performance of improving the system resolution, optimizing the distortion, CRA and the like is realized on the premise that the optical system is compact in structure. 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, 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 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| ≦ 15, for example R3/R4| ≦ 8. 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 curvature radius of the object side surface of the lens is close to the curvature radius of the image side surface or the shape of the object side surface is more curved than that of the image side surface, the aberration of an optical system can be corrected, and the image quality can be improved.

In an exemplary embodiment, a distance TTL on an optical axis from an object side surface of the first lens to an imaging surface of the optical lens and a total effective focal length F of the optical lens satisfy: TTL/F ≦ 9, e.g., TTL/F ≦ 8. In the present application, the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical lens is also referred to as the total length of the optical lens. The proportional relation between the total length of the optical lens and the total effective focal length is reasonably controlled, so that the optical lens has better performance, and the miniaturization of the lens is realized.

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 ≦ 0.06, e.g., TTL/H/FOV ≦ 0.05. 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 ≦ 0.025, e.g., 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 F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy: 0.1. ltoreq. F5/F6. ltoreq.1.6, for example 0.1. ltoreq. F5/F6. ltoreq.1.5. The proportional relation between the effective focal length of the fifth lens and the effective focal length of the sixth lens is reasonably set, so that the focal lengths of the fifth lens and the sixth lens are close, smooth transition of light rays is facilitated, and chromatic aberration of a system is corrected.

In an exemplary embodiment, a maximum value p in a ratio of center thicknesses of any two lenses of the first lens to the seventh lens on the optical axis satisfies: 2. ltoreq. p.ltoreq.8, for example 3. ltoreq. p.ltoreq.7.2. The ratio of the central thicknesses of any two lenses in the first lens to the seventh lens on the optical axis is between 2 and 8 (including 2 and 8), so that the thicknesses among the lenses in the optical lens are uniform, and the effect stability of each lens is facilitated. In a high and low temperature change environment, the light change in the optical system is small, so that the optical system has good temperature adaptability.

In an exemplary embodiment, a radius of curvature R13 of the object-side surface of the seventh lens and a radius of curvature R14 of the image-side surface of the seventh lens satisfy: R13/R14| ≦ 15, for example R13/R14| ≦ 8. The proportional relation between the curvature radius of the object side surface of the seventh lens and the curvature radius of the image side surface of the seventh lens is reasonably set, so that the curvature radii of the object side surface and the image side surface of the lenses are close, light rays can smoothly enter an optical system, and the resolution quality of the system is improved.

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: 3.ltoreq.F 56/F.ltoreq.10, for example 3.ltoreq.F 56/F.ltoreq.9.5. The proportion 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 system thermal compensation is favorably realized.

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 the characteristics of large field angle and long focus, and large-angle resolution is realized.

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: 0.02. ltoreq.R 3-R4)/(R3+ R4. ltoreq.0.4, for example 0.03. ltoreq.R 3-R4)/(R3+ R4. ltoreq.0.3. 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 are set to satisfy the relation, so that aberration of the optical system is favorably corrected, when light rays emitted from the second lens enter the object side surface of the third lens, the incident angle of the light rays is not too large, and tolerance sensitivity of the optical system is reduced. If the numerical limit of the above conditional expression exceeds the upper limit, the aberration of the optical system may not be sufficiently corrected; if the value of the conditional expression is lower than the lower limit, the incident angle of the light emitted from the first lens when entering the object side of the second lens may be too large, which increases the sensitivity of the optical system.

In an exemplary embodiment, the total effective focal length F of the optical lens and the radius of curvature R1 of the object side surface of the first lens satisfy: i F/R1. ltoreq.1.5, for example, | F/R1. ltoreq.1. The proportional relation between the total effective focal length of the optical lens and the curvature radius of the object side surface of the first lens is reasonably set, so that the first lens is beneficial to avoiding the phenomenon that the curvature of the object side surface of the first lens is too small, and aberration is generated due to the fact that the curvature of the object side surface is too small when light rays are incident, and the first lens is beneficial to processing and manufacturing.

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.30, for example R1/R2. ltoreq.20. The proportional relation of 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, the special shape setting of the first lens is met, and the improvement of the resolving power of an optical system is facilitated.

In an exemplary embodiment, an image height H at which a total effective focal length F of the optical lens corresponds to a maximum field angle of the optical lens satisfies: F/H.ltoreq.3, for example F/H.ltoreq.2. The proportion relation between the total effective focal length of the optical lens and the image height corresponding to the maximum field angle of the optical lens is reasonably set, so that the conditions are met, the long-focus characteristic of the optical system is favorably realized, and the resolving power 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: i F1/F | ≧ 1, e.g., 1 ≦ F1/F ≦ 50. 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, for example, 1 ≦ F2/F | ≦ 95. 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 | ≧ 1, e.g., 1 ≦ F3/F ≦ 50. 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., 1 ≦ F4/F ≦ 50. 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 | ≧ 0.05, for example, 0.05. ltoreq. F5/F |. ltoreq.50. 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 | ≧ 1, e.g., 1 ≦ F6/F ≦ 50. 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., 1 ≦ F/F ≦ 50. 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 first 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. Specifically, at least one lens of the first lens, the fourth lens and the seventh lens is an aspheric lens, which is beneficial to improving the resolution quality of the optical system.

According to the optical lens of the above embodiment of the present application, through reasonable setting of the shapes and focal powers of the respective lenses, in the case of using only 7 lenses, high resolution quality of the optical system is achieved, and meanwhile, requirements of small lens size, low sensitivity, high production yield and low cost are met. The optical lens also has the characteristic of smaller CRA (crazing code), is beneficial to avoiding stray light generated when light is emitted at the rear end of the system and hits the lens cone, and can be well matched with a vehicle-mounted chip to avoid the phenomena of color cast and dark angle. Meanwhile, the optical lens has the advantages of good temperature adaptability, small change of imaging effect in high and low temperature environments, stable image quality and contribution to accurate distance measurement of the binocular lens.

According to the optical lens of the above embodiment of the application, the cemented lens is arranged, the whole chromatic aberration correction of the system is shared, the system aberration correction is facilitated, the system resolution quality is improved, the whole structure of the optical system is compact, and the miniaturization requirement is met.

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

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although 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 concave and the image side S4 being convex. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a meniscus lens with positive power, with the object side S8 being concave and the image side S9 being convex. 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 meniscus lens with negative power, and has a concave object-side surface S11 and a convex 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.

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

In the present embodiment, the object-side and image-side surfaces of the first lens L1, 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 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, miniaturization, small front end aperture, small CRA, 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 the conic coefficients K and high-order term coefficients A, B, C, D, E and F of the aspherical lens surfaces S3, S4, S8, S9, S13 and S14 that can be used in example 1.

Flour mark

K

A

B

C

D

E

F

S1

-8.6121

-5.0316E-03

3.9273E-04

-1.7811E-05

4.6377E-07

-5.3068E-09

-3.3430E-12

S2

-1.0931

-8.9657E-03

1.3765E-03

-1.0080E-04

5.4080E-06

2.2167E-09

2.3398E-09

S8

1.3447

1.0766E-04

9.3327E-06

3.9776E-06

-1.0435E-07

-3.6960E-09

-5.0236E-10

S9

0.5701

9.9179E-05

5.5981E-05

1.7244E-06

-3.5205E-09

-6.9574E-09

1.6033E-10

S13

-5.0799

-2.7587E-03

3.3126E-05

1.4172E-06

-6.0270E-09

1.6360E-09

-1.4752E-10

S14

-64.7854

-3.2058E-03

5.7797E-05

4.9622E-07

-2.1064E-08

1.8172E-09

-2.4383E-11

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.

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 concave and the image side S4 being convex. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a meniscus lens with negative power, with the object side S8 being concave and the image side S9 being concave. 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 meniscus lens with negative power, and has a concave object-side surface S11 and a convex 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.

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.

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 high-order term coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 2.

Flour mark

K

A

B

C

D

E

F

S1

0.1253

-5.1880E-03

3.5150E-04

-1.7414E-05

4.5977E-07

-5.6025E-09

6.0397E-12

S2

-0.4627

-7.8130E-03

3.3192E-04

1.4159E-05

-3.1150E-06

-8.4308E-08

-5.1591E-09

S8

23.2794

-8.4908E-05

5.5277E-05

-9.4002E-06

8.9923E-07

-9.9064E-09

-5.9767E-09

S9

96.1771

2.6816E-04

5.2012E-05

-1.0645E-06

-1.8913E-07

-3.0919E-08

5.9905E-09

S13

-0.5644

-1.5642E-03

6.5637E-06

-2.4673E-06

-3.0164E-08

-9.3978E-11

-1.2741E-10

S14

-0.0829

-1.7987E-03

7.2015E-05

-1.0871E-05

2.9941E-07

-7.7890E-10

-2.7160E-10

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 concave and the image side S4 being convex. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a meniscus lens with negative power, with the object side S8 being convex and the image side S9 being concave. 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 meniscus lens with negative power, and has a concave object-side surface S11 and a convex 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.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the object side S6 of the third lens L3.

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 high-order term coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 3.

Flour mark

K

A

B

C

D

E

F

S1

-1.1808

-6.9706E-03

4.3652E-04

-1.6320E-05

3.4132E-07

-3.1525E-09

3.0514E-12

S2

-0.6520

-1.2910E-02

5.1764E-04

-3.7246E-06

-2.5544E-06

2.7265E-09

2.4055E-09

S8

-99.0000

-1.6697E-03

1.2784E-04

-1.8930E-05

8.4212E-07

-3.7826E-09

-5.1172E-10

S9

2.2552

-1.7364E-03

1.7735E-04

-1.6706E-05

3.6523E-07

-7.0350E-09

1.4336E-10

S13

-1.2000

-1.7521E-03

-7.6970E-06

-3.0484E-06

-1.7010E-07

1.6820E-09

-1.4363E-10

S14

0.2328

-1.9796E-03

1.3886E-05

-8.1978E-06

1.2570E-07

1.8044E-09

-2.5365E-11

TABLE 6

Example 4

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

As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, 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 concave and the image side S4 being convex. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a meniscus lens with negative power, with the object side S8 being concave and the image side S9 being convex. 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 meniscus lens with negative power, and has a concave object-side surface S11 and a convex 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 convex. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the image side S4 of the second lens L2.

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 high-order term coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 4.

Flour mark

K

A

B

C

D

E

F

S1

-2.6214

-5.5540E-03

3.9917E-04

-1.7378E-05

4.1560E-07

-4.0953E-09

-3.4134E-12

S2

-0.8024

-7.1093E-03

8.3126E-04

-3.2994E-05

2.8793E-06

2.7265E-09

2.4055E-09

S8

-12.6548

2.1566E-04

3.7986E-05

-1.7930E-06

-2.7719E-08

-3.7826E-09

-5.1172E-10

S9

-44.2437

5.0957E-04

3.7498E-05

4.6175E-06

-4.1967E-07

-7.0350E-09

1.4336E-10

S13

-64.7528

-3.0964E-03

2.9983E-05

1.8027E-06

-1.4749E-07

1.6820E-09

-1.4363E-10

S14

99.0000

-2.7820E-03

9.1285E-05

-7.6613E-07

-6.0145E-08

1.8044E-09

-2.5365E-11

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 concave and the image side S4 being convex. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens L4 is a meniscus lens with negative power, with the object side S8 being concave and the image side S9 being convex. 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 meniscus lens with negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a meniscus lens with positive power, with the object side S13 being concave and the image side S14 being convex. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the object side S4 of the second lens L2.

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, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 5.

Flour mark

K

A

B

C

D

E

F

S1

-2.46E+00

-5.48E-03

4.03E-04

-1.74E-05

4.04E-07

-3.80E-09

-3.41E-12

S2

-7.24E-01

-8.25E-03

7.63E-04

-2.30E-05

2.53E-06

2.73E-09

2.41E-09

S8

-1.39E+01

2.23E-04

3.19E-05

-3.41E-06

3.96E-08

-3.78E-09

-5.12E-10

S9

-9.90E+01

5.84E-04

3.20E-05

3.49E-06

-4.07E-07

-7.04E-09

1.43E-10

S13

9.90E+01

-3.88E-03

2.82E-05

5.33E-06

-3.20E-07

1.68E-09

-1.44E-10

S14

1.67E+00

-2.79E-03

1.07E-04

-2.00E-07

-9.68E-08

1.80E-09

-2.54E-11

Watch 10

In summary, examples 1 to 5 each satisfy the relationship shown in table 11 below. In table 13, units of F1, F2, F3, F4, F5, F6, F7, F56, TTL, H, F, D, R1, R2, R3, R4, R13, and R14 are millimeters (mm), and units of FOV are degrees (°)

TABLE 11

Examples 1 to 5 each satisfy the relationship shown in table 12 below. In table 12, units of d1, d2, d3, d4, d5, d6, d7, dn (max), dm (min) are millimeters (mm).

d1 to d7 correspond to the center thickness of each of the first to seventh lenses on the optical axis, respectively; dn (max) is a maximum central thickness value among central thicknesses of the respective first to seventh lenses on the optical axis, dm (min) is a minimum central thickness value among central thicknesses of the respective first to seventh lenses on the optical axis; and max { dn: dm } is the maximum value of the ratio of the central thicknesses of any two lenses of the first lens to the seventh lens on the optical axis, i.e., p described above.

Conditional expression (A) example	Example 1	Example 2	Example 3	Example 4	Example 5
						d1	0.9050	1.2000	1.2000	1.2000	1.2000
d2	4.7000	4.9799	3.6344	4.7119	4.6584
						d3	2.4580	2.1651	1.9765	2.6249	2.6335
d4	1.5073	0.7000	1.0000	0.8000	0.8284
						d5	3.2296	4.0140	3.2696	3.0632	2.9000
d6	2.3354	0.8487	1.0000	1.2371	0.8000
						d7	2.4592	2.2035	1.4554	2.3861	2.3959
dn(max)	4.7000	4.9799	3.6344	4.7119	4.6584
						dm(min)	0.9050	0.7000	1.0000	0.8000	0.8000
max{dn:dm}	5.1936	7.1141	3.6344	5.8899	5.8230

TABLE 12

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 concave surface, and the image side surface of the second lens is a convex surface;

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

the fourth lens has optical power;

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 convex surface; and

the seventh lens has a positive optical power.

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

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

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

7. 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.

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

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 positive optical power;

the fourth lens has 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 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≤30。

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.