Optical lens and electronic device

Abstract

The application discloses an optical lens and an electronic device comprising the same. The optical lens comprises, in order from a first side to a second side along an optical axis: a first lens with negative refractive power, the first side of which is a convex surface and the second side of which is a concave surface; a second lens with positive refractive power, the first side of which is a concave surface and the second side of which is a convex surface; a third lens with refractive power, the first side of which is a concave surface and the second side of which is a convex surface; a fourth lens with positive refractive power, the first side of which is a convex surface; a fifth lens with positive refractive power, the first side of which is a convex surface and the second side of which is a convex surface; a sixth lens with negative refractive power, the first side of which is a concave surface; and a seventh lens with positive refractive power, the first side of which is a convex surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, and more particularly, to an optical lens and an electronic device. BACKGROUND

[0002] With the improvement of the imaging quality of optical lenses, optical lenses have been widely used in various fields. For example, optical lenses play an irreplaceable role in intelligent detection, security monitoring, smart phones, and vehicle assisted driving, etc. At the same time, in order to improve the competitiveness of their products, lens manufacturers in various fields begin to invest a lot of time and effort in the research and development of lens performance.

[0003] In particular, with the rapid development of vehicle assisted driving systems, optical lenses have been widely used in vehicle assisted driving systems, such as vehicle-mounted reversing visual systems, vehicle recorders, automatic parking and panoramic parking systems, and road navigation systems. With the development of driverless vehicles, vehicle-mounted lenses are one of the main tools for vehicle and external information transmission, and the market requires higher resolution for vehicle-mounted lenses.

[0004] Generally, most lens manufacturers will choose to increase the number of lenses to improve the resolution of the lens, but this will seriously affect the miniaturization of the lens to some extent. In addition, considering that vehicle-mounted lenses need to have a large field of view, the current inner-view vehicle-mounted lenses either have a small field of view or have a large field of view but also have problems such as large CRA and large distortion. In addition, in practice, the application environment of vehicle-mounted lenses may have a large temperature difference (such as high temperature in summer and low temperature in winter), and the lenses applied in such conditions will produce image plane shift, resulting in blurred imaging and affecting normal use. Most vehicle-mounted lenses on the market cannot guarantee clear imaging in high and low temperature environments. SUMMARY

[0005] The present application provides an optical lens, which comprises, in order from a first side to a second side along an optical axis: a first lens having a negative optical power, a first side of which is a convex surface and a second side of which is a concave surface; a second lens having a positive optical power, a first side of which is a concave surface and a second side of which is a convex surface; a third lens having an optical power, a first side of which is a concave surface and a second side of which is a convex surface; a fourth lens having a positive optical power, a first side of which is a convex surface; a fifth lens having a positive optical power, a first side of which is a convex surface and a second side of which is a convex surface; a sixth lens having a negative optical power, a first side of which is a concave surface; and a seventh lens having a positive optical power, a first side of which is a convex surface.

[0006] In one embodiment, the third lens has a positive optical power or a negative optical power.

[0007] In an embodiment, the second side surface of the fourth lens is concave.

[0008] In an embodiment, the second side surface of the fourth lens is convex.

[0009] In an embodiment, the second side surface of the sixth lens is concave.

[0010] In an embodiment, the second side surface of the sixth lens is convex.

[0011] In an embodiment, the second side surface of the seventh lens is concave.

[0012] In an embodiment, the second side surface of the seventh lens is convex.

[0013] In an embodiment, a total track length TTL of the optical lens, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens can satisfy: TTL / H / FOV≤0.06.

[0014] In an embodiment, a radius of curvature R1 of the first side surface of the first lens and a radius of curvature R2 of the second side surface of the first lens can satisfy: R1 / R2≤6.

[0015] In an embodiment, a maximum field of view θ of the optical lens in radian, a maximum entrance pupil diameter D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens can satisfy: D / H / θ≤2.

[0016] In an embodiment, a back focal length BFL of the optical lens and a total track length TTL of the optical lens can satisfy: BFL / TTL≥0.1.

[0017] In an embodiment, an effective focal length F5 of the fifth lens and an effective focal length F6 of the sixth lens can satisfy: |F5 / F6|≤4.

[0018] In an embodiment, a maximum field of view 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 of view of the optical lens can satisfy: (FOV×F) / H≥40.

[0019] In an embodiment, a radius of curvature R3 of the first side surface of the second lens and a radius of curvature R4 of the second side surface of the second lens can satisfy: |R3 / R4|≤4.

[0020] In an embodiment, a distance T12 on the optical axis from the center of the second side surface of the first lens to the center of the first side surface of the second lens and a total track length TTL of the optical lens can satisfy: T12 / TTL≤0.35.

[0021] In an embodiment, a radius of curvature R1 of the first side surface of the first lens and a total effective focal length F of the optical lens can satisfy: |F / R1|≥0.05.

[0022] In an embodiment, a total track length TTL of the optical lens and the total effective focal length F of the optical lens can satisfy: TTL / F≤15.

[0023] In an embodiment, an effective focal length F1 of the first lens and the total effective focal length F of the optical lens can satisfy: |F1 / F|≤4.

[0024] In an embodiment, an effective focal length F2 of the second lens and the total effective focal length F of the optical lens can satisfy: |F2 / F|≤60.

[0025] In an embodiment, an effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens can satisfy: |F4 / F|≤8.

[0026] In an embodiment, an effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens can satisfy: |F7 / F|≤18.

[0027] In an embodiment, a radius of curvature R2 of the second side surface of the first lens and a radius of curvature R3 of the first side surface of the second lens can satisfy: -10≤(R2-R3) / (R2+R3)≤1.

[0028] In an embodiment, a central thickness dn of an nth lens with a maximum central thickness among the first lens to the seventh lens on the optical axis and a central thickness dm of an mth lens with a minimum central thickness among the first lens to the seventh lens on the optical axis can satisfy: 0.9≤dn / dm≤10, where n, m=1, 2, 3, 4, 5, 6, 7.

[0029] In an embodiment, an image height H corresponding to a maximum field angle of view of the optical lens and a total track length TTL of the optical lens can satisfy: TTL / H≤6.

[0030] In an embodiment, an opening angle arctan(1 / K2) of the second side surface of the first lens corresponding to a maximum field angle of view of the optical lens can satisfy: arctan(1 / K2)≥50.

[0031] In an embodiment, a central thickness d1 of the first lens on the optical axis and a central thickness d2 of the second lens on the optical axis can satisfy: d1 / d2≤2.

[0032] In an embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens.

[0033] In one embodiment, the seventh lens has at least one inflection point on the first side and the second side.

[0034] In one embodiment, the optical lens further comprises a diaphragm disposed between the third lens and the fourth lens.

[0035] In one embodiment, at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical surface.

[0036] Another aspect of the present application provides an optical lens. The optical lens comprises, in order from a first side to a second side along an optical axis, a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power; and a seventh lens having a positive refractive power. A maximum field angle of the optical lens corresponds to an opening angle of the second side surface of the first lens arctan(1 / K2) which can satisfy: arctan(1 / K2)≥50.

[0037] In one embodiment, the first side surface of the first lens is convex, and the second side surface is concave.

[0038] In one embodiment, the first side surface of the second lens is concave, and the second side surface is convex.

[0039] In one embodiment, the third lens has a positive refractive power, the first side surface is concave, and the second side surface is convex.

[0040] In one embodiment, the third lens has a negative refractive power, the first side surface is concave, and the second side surface is convex.

[0041] In one embodiment, the first side surface of the fourth lens is convex, and the second side surface is concave.

[0042] In one embodiment, the first side surface of the fourth lens is convex, and the second side surface is convex.

[0043] In one embodiment, the first side surface of the fifth lens is convex, and the second side surface is convex.

[0044] In one embodiment, the first side surface of the sixth lens is concave, and the second side surface is concave.

[0045] In one embodiment, the first side surface of the sixth lens is concave, and the second side surface is convex.

[0046] In one embodiment, the first side surface of the seventh lens is convex, and the second side surface is concave.

[0047] In one embodiment, the first side surface of the seventh lens is convex, and the second side surface is convex.

[0048] In an embodiment, the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens can satisfy: TTL / H / FOV≤0.06.

[0049] In an embodiment, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens can satisfy: R1 / R2≤6.

[0050] In an embodiment, the maximum field of view θ of the optical lens in radian, the maximum aperture D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens can satisfy: D / H / θ≤2.

[0051] In an embodiment, the back focal length BFL of the optical lens and the total track length TTL of the optical lens can satisfy: BFL / TTL≥0.1.

[0052] In an embodiment, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens can satisfy: |F5 / F6|≤4.

[0053] In an embodiment, the maximum field of view 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 of view of the optical lens can satisfy: (FOVxF) / H≥40.

[0054] In an embodiment, the radius of curvature R3 of the first side surface of the second lens and the radius of curvature R4 of the second side surface of the second lens can satisfy: |R3 / R4|≤4.

[0055] In an embodiment, the distance T12 on the optical axis from the center of the second side surface of the first lens to the center of the first side surface of the second lens and the total track length TTL of the optical lens can satisfy: T12 / TTL≤0.35.

[0056] In an embodiment, the radius of curvature R1 of the first side surface of the first lens and the total effective focal length F of the optical lens can satisfy: |F / R1|≥0.05.

[0057] In an embodiment, the total track length TTL of the optical lens and the total effective focal length F of the optical lens can satisfy: TTL / F≤15.

[0058] In an embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens can satisfy: |F1 / F|≤4.

[0059] In an embodiment, an effective focal length F2 of the second lens and a total effective focal length F of the optical lens can satisfy: |F2 / F|≤60.

[0060] In an embodiment, an effective focal length F4 of the fourth lens and a total effective focal length F of the optical lens can satisfy: |F4 / F|≤8.

[0061] In an embodiment, an effective focal length F7 of the seventh lens and a total effective focal length F of the optical lens can satisfy: |F7 / F|≤18.

[0062] In an embodiment, a curvature radius R2 of the second side surface of the first lens and a curvature radius R3 of the first side surface of the second lens can satisfy: -10≤(R2-R3) / (R2+R3)≤1.

[0063] In an embodiment, a central thickness dn of an nth lens with a maximum central thickness among the first lens to the seventh lens on the optical axis and a central thickness dm of an mth lens with a minimum central thickness among the first lens to the seventh lens on the optical axis can satisfy: 0.9≤dn / dm≤10, where n, m = 1, 2, 3, 4, 5, 6, 7.

[0064] In an embodiment, an image height H corresponding to a maximum field angle of view of the optical lens and a total length TTL of the optical lens can satisfy: TTL / H≤6.

[0065] In an embodiment, a central thickness d1 of the first lens on the optical axis and a central thickness d2 of the second lens on the optical axis can satisfy: d1 / d2≤2.

[0066] In an embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens.

[0067] In an embodiment, the first side surface and the second side surface of the seventh lens have at least one inflection point.

[0068] In an embodiment, the optical lens further comprises a diaphragm arranged between the third lens and the fourth lens.

[0069] In an embodiment, at least one lens surface among the object side surface of the first lens to the image side surface of the seventh lens is an aspherical lens surface.

[0070] Another aspect of the present application provides an electronic device. The electronic device comprises the optical lens provided by the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0071] Seven lenses are adopted in the present application, and by optimizing the shape, focal power and the like of each lens, the optical lens has at least one of the following beneficial effects: high resolution (up to 8 million pixels), miniaturization, large field of view, small CRA, small distortion, good temperature performance, low cost, high imaging quality, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0072] Other features, objects, and advantages of the present application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings:

[0073] Figure 1 a structure schematic diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0074] Figure 2 a structure schematic diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0075] Figure 3 a structure schematic diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0076] Figure 4 a structure schematic diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0077] Figure 5 a structure schematic diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0078] Figure 6 a structure schematic diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0079] Figure 7 a structure schematic diagram of an optical lens according to Embodiment 7 of the present application is shown; and

[0080] Figure 8 a structure schematic diagram of an optical lens according to Embodiment 8 of the present application is shown. DETAILED DESCRIPTION

[0081] For the purpose of promoting an understanding of the principles of the application, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will, nevertheless, be understood that no limitation of the scope of the application is thereby intended, such alterations and further modifications in the illustrated device being contemplated as falling within the scope of the application. It is also to be understood that the use of relational terms such as first, second and third, and the like, are used merely for distinguishing between one element from another element, and do not necessitate a serial or chronological order to the elements. It is to be understood that the above description is intended to be illustrative and not restrictive.

[0082] It should be noted that the terms first, second, third, etc. merely identify one feature from another, but do not necessitate these features to be present in a given order. Accordingly, under the teachings of the present application, a first lens discussed below could also be termed a second lens or a third lens.

[0083] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease of explanation. Specifically, the shape of the spherical or aspherical surface 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 drawings are merely examples and are not drawn to scale.

[0084] In this document, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region; if a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is referred to as the first side surface of the lens, and the surface of each lens closest to the second side is referred to as the second side surface of the lens. The surface of the optical lens closest to the second side is referred to as the second side surface of the optical lens. Exemplarily, the first side can be the object side, and the second side can be the image side; or, the first side can be the imaging side, and the second side can be the image source side.

[0085] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", 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. In addition, when expressions such as "at least one of" appear after a list of items, it modifies the entire list of items and does not modify the individual items in the list. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0086] 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 should also be understood that the terms 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.

[0087] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0088] The features, principles, and other aspects of the present application are described in detail below.

[0089] In an example embodiment, the optical lens includes, for example, seven lenses with 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 along an optical axis from a first side to a second side.

[0090] In an example embodiment, the optical lens provided by the present application can be used as, for example, a vehicle-mounted lens, in which case the first side of the optical lens can be an object side, and the second side can be an image side. Light rays from the object side can be imaged on the image side. The second side of the optical lens is an imaging surface of the optical lens.

[0091] In an example embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a laser radar transmitting end lens, in which case the second side of the optical lens can be an image source side, and the first side can be an imaging side. Light rays from the image source side can be imaged on the imaging side. The second side of the optical lens is an image source surface of the optical lens.

[0092] In an example embodiment, the optical lens can further include a light sensing element disposed on the second side. Optionally, the light sensing element disposed on the second side can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0093] In an example embodiment, the first lens can have negative optical power. The first lens can have a convex-concave surface shape. Such optical power and surface shape of the first lens are beneficial for diverging light rays, smoothly transitioning the light rays, while maximizing the amount of light rays entering the first lens at large angles, improving the lens' s illumination, and reducing the optical path of light rays in the rear, thereby reducing the overall length of the lens, while increasing the etendue.

[0094] In an example embodiment, the second lens can have positive optical power. The second lens can have a concave-convex surface shape. Such optical power and surface shape of the second lens are beneficial for smoothly entering the light rays diverged by the first lens into the second lens, correcting high-order aberrations, reducing the degree of attenuation of the lens' s relative illumination, while achieving small distortion.

[0095] In an example embodiment, the third lens can have positive optical power or negative optical power. The third lens can have a concave-convex surface shape. Such optical power and surface shape of the third lens can smoothly transition the light rays from the front lenses to the rear optical lens, reducing the overall length of the lens, increasing the back focal length of the lens, while the concave-convex surface shape of the second lens is more beneficial for reducing the distortion of the lens.

[0096] In an exemplary embodiment, the fourth lens can have positive refractive power. The fourth lens can have a convex-concave surface type or a convex-convex surface type. Such refractive power and surface type of the fourth lens can compensate for the spherical aberration introduced by the first three lenses, further correct the aberration introduced by the first three lenses, and further converge the light beams, thereby increasing the aperture of the lens and shortening the total length of the lens, and making the optical lens structure more compact, and making the optical system have a relatively short total length of the lens.

[0097] In an exemplary embodiment, the fifth lens can have positive refractive power. The fifth lens can have a convex-convex surface type. Such refractive power and surface type of the fifth lens can converge the light rays and reduce the CRA.

[0098] In an exemplary embodiment, the sixth lens can have negative refractive power. The sixth lens can have a concave-convex surface type or a concave-concave surface type. Such refractive power and surface type of the sixth lens can help the light rays enter the seventh lens gently and improve the resolution.

[0099] In an exemplary embodiment, the seventh lens can have positive refractive power. The seventh lens can have a convex-concave surface type or a convex-convex surface type. Such refractive power and surface type of the seventh lens can help the light rays enter the second side of the optical lens gently and improve the resolution, and can also correct various aberrations of the optical lens, so that the optical lens can improve the resolution, reduce the distortion, and improve the CRA and other optical performances while being compact.

[0100] In an exemplary embodiment, a diaphragm can be arranged between the third lens and the fourth lens to further improve the imaging quality of the optical lens. Arranging the diaphragm between the third lens and the fourth lens can effectively converge the light rays entering the optical lens and reduce the lens aperture. In the embodiment, the diaphragm can be arranged near the second side of the third lens, or the diaphragm can be arranged near the first side of the fourth lens. However, it should be noted that the position of the diaphragm disclosed herein is only an example and is not a limitation. In alternative embodiments, the diaphragm can also be arranged at other positions according to actual needs.

[0101] In an exemplary embodiment, the total length TTL of the optical lens can be the distance from the center of the first side of the first lens to the second side of the optical lens on the optical axis. The back focal length BFL of the optical lens can be the distance from the center of the second side of the seventh lens to the second side of the optical lens on the optical axis.

[0102] In exemplary embodiments, the optical lens according to the present application can satisfy: TTL / H / FOV≤0.06, where TTL is the total length of the optical lens, FOV is the maximum field of view angle of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, TTL, H and FOV can further satisfy: TTL / H / FOV≤0.05. Satisfying TTL / H / FOV≤0.06 can effectively limit the length of the optical lens while keeping the imaging surface and the image height of the optical lens unchanged, which is conducive to realizing the miniaturization of the optical lens.

[0103] In exemplary embodiments, the optical lens according to the present application can satisfy: R1 / R2≤6, where R1 is the curvature radius of the first side surface of the first lens, and R2 is the curvature radius of the second side surface of the first lens. More specifically, R1 and R2 can further satisfy: R1 / R2≤5. Satisfying R1 / R2≤6 is conducive to making the first lens collect light rays of a larger angle into the rear optical lens, and is conducive to reducing the front aperture of the optical lens, reducing the volume of the optical lens, and realizing the miniaturization of the optical lens while improving the resolution of the optical lens.

[0104] In exemplary embodiments, the optical lens according to the present application can satisfy: D / H / θ≤2, where θ is the maximum field of view angle of the optical lens in radians, D is the maximum light passing aperture of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, D, H and θ can further satisfy: D / H / θ≤1.7. Satisfying D / H / θ≤2 is conducive to reducing the front aperture of the optical lens and realizing the miniaturization.

[0105] In exemplary embodiments, the optical lens according to the present application can satisfy: BFL / TTL≥0.1, where BFL is the back focal length of the optical lens, and TTL is the total length of the optical lens. More specifically, BFL and TTL can further satisfy: BFL / TTL≥0.12. Satisfying BFL / TTL≥0.1 is conducive to making the back focal length BFL of the optical lens longer on the basis of realizing the miniaturization, which is conducive to the assembly of the optical lens.

[0106] In exemplary embodiments, the optical lens according to the present application can satisfy: |F5 / F6|≤4, where F5 is the effective focal length of the fifth lens, and F6 is the effective focal length of the sixth lens. More specifically, F5 and F6 can further satisfy: |F5 / F6|≤3. Satisfying |F5 / F6|≤4 is conducive to the smooth transition of light rays, is conducive to correcting chromatic aberration, improving image quality, and effectively improving the thermal compensation of the optical lens.

[0107] In exemplary embodiments, the optical lens according to the present application can satisfy: (FOVxF) / H 40, wherein FOV is the maximum field of view angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, FOV, F and H can further satisfy: (FOVxF) / H 44. Satisfying (FOVxF) / H 40 is conducive to making the lens have the characteristics of long focal length, large field of view angle and small distortion.

[0108] In exemplary embodiments, the optical lens according to the present application can satisfy: |R3 / R4| 4, wherein R3 is the curvature radius of the first side surface of the second lens, and R4 is the curvature radius of the second side surface of the second lens. More specifically, R3 and R4 can further satisfy: |R3 / R4| 3. Satisfying |R3 / R4| 4 is conducive to making the second lens collect more light, increasing the light transmittance of the lens.

[0109] In exemplary embodiments, the optical lens according to the present application can satisfy: T12 / TTL 0.35, wherein T12 is the distance on the optical axis from the center of the second side surface of the first lens to the center of the first side surface of the second lens, and TTL is the total length of the optical lens. More specifically, T12 and TTL can further satisfy: T12 / TTL 0.3. Satisfying T12 / TTL 0.35 is conducive to smooth transition of light, and is conducive to improving image quality.

[0110] In exemplary embodiments, the optical lens according to the present application can satisfy: |F / R1| 0.05, wherein R1 is the curvature radius of the first side surface of the first lens, and F is the total effective focal length of the optical lens. More specifically, F and R1 can further satisfy: |F / R1| 0.09. Satisfying |F / R1| 0.05 is conducive to making the refraction angle of incident light change more gently in the lens, avoiding excessive refraction change to generate excessive aberration, and is conducive to the manufacture of the first lens, while reducing the tolerance sensitivity.

[0111] In exemplary embodiments, the optical lens according to the present application can satisfy: TTL / F 15, wherein TTL is the total length of the optical lens, and F is the total effective focal length of the optical lens. More specifically, TTL and F can further satisfy: TTL / F 13. Satisfying TTL / F 15 can effectively limit the length of the lens, and realize miniaturization of the lens.

[0112] In exemplary embodiments, the optical lens according to the present application can satisfy: |F1 / F| 4, wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens. More specifically, F1 and F can further satisfy: |F1 / F| 3. Satisfying |F1 / F| 4 is conducive to making the back focal length BFL of the lens longer, and is conducive to lens assembly.

[0113] In exemplary embodiments, the optical lens according to the present application can satisfy: |F2 / F|≤60, wherein F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical lens. More specifically, F2 and F can further satisfy: |F2 / F|≤50. Satisfying |F2 / F|≤60 is beneficial to realize small distortion.

[0114] In exemplary embodiments, the optical lens according to the present application can satisfy: |F3 / F|≤100, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens. More specifically, F3 and F can further satisfy: |F3 / F|≤98.

[0115] In exemplary embodiments, the optical lens according to the present application can satisfy: |F4 / F|≤8, wherein F4 is the effective focal length of the fourth lens, and F is the total effective focal length of the optical lens. More specifically, F4 and F can further satisfy: |F4 / F|≤7. Satisfying |F4 / F|≤8 is beneficial to reduce lens aberration and improve lens imaging quality.

[0116] In exemplary embodiments, the optical lens according to the present application can satisfy: |F5 / F|≤7, wherein F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens. More specifically, F5 and F can further satisfy: |F5 / F|≤6.

[0117] In exemplary embodiments, the optical lens according to the present application can satisfy: |F6 / F|≤6, wherein F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens. More specifically, F6 and F can further satisfy: |F6 / F|≤5.

[0118] In exemplary embodiments, the optical lens according to the present application can satisfy: |F7 / F|≤18, wherein F7 is the effective focal length of the seventh lens, and F is the total effective focal length of the optical lens. More specifically, F7 and F can further satisfy: |F7 / F|≤16. Satisfying |F7 / F|≤18 is beneficial to the seventh lens to converge light rays and ensure the light flux of the lens.

[0119] In exemplary embodiments, the optical lens according to the present application can satisfy: -10≤(R2-R3) / (R2+R3)≤1, where R2 is the curvature radius of the second side surface of the first lens, and R3 is the curvature radius of the first side surface of the second lens. More specifically, R2 and R3 can further satisfy: -9≤(R2-R3) / (R2+R3)≤0. Satisfying -10≤(R2-R3) / (R2+R3)≤1 can correct aberration of the optical lens, and can ensure that when the light rays exiting from the first lens are incident to the first side surface of the second lens, the incident light rays are relatively gentle, thereby being beneficial to reduce the tolerance sensitivity of the optical lens.

[0120] In exemplary embodiments, the optical lens according to the present application can satisfy: 0.9≤dn / dm≤10, where dn is the central thickness of the nth lens with the largest central thickness among the first lens to the seventh lens on the optical axis, dm is the central thickness of the mth lens with the smallest central thickness among the first lens to the seventh lens on the optical axis, and n, m = 1, 2, 3, 4, 5, 6, 7. More specifically, dn and dm can further satisfy: 1≤dn / dm≤9. Satisfying 0.9≤dn / dm≤10 is beneficial to make the thickness of each lens uniform, the effect of each lens stable, and help to ensure that the light rays change little at high and low temperatures, and the temperature performance is good.

[0121] In exemplary embodiments, the optical lens according to the present application can satisfy: TTL / H≤6, where H is the image height corresponding to the maximum field angle of the optical lens, and TTL is the total length of the optical lens. More specifically, TTL and H can further satisfy: TTL / H≤5. Satisfying TTL / H≤6 can effectively reduce the total optical length of the lens group composed of each lens, thereby meeting the needs of miniaturization design.

[0122] In exemplary embodiments, the optical lens according to the present application can satisfy: arctan(1 / K2)≥50, where arctan(1 / K2) is the opening angle of the second side surface of the first lens corresponding to the maximum field angle of the optical lens. More specifically, arctan(1 / K2) can further satisfy: arctan(1 / K2)≥52. Satisfying arctan(1 / K2)≥50 is beneficial to make the opening angle of the second side surface of the first lens larger, so that the peripheral large-angle light rays can be quickly focused after entering the first lens, thereby improving the imaging quality.

[0123] In exemplary embodiments, the optical lens according to the present application can satisfy: d1 / d2≤2, where d1 is the central thickness of the first lens on the optical axis, and d2 is the central thickness of the second lens on the optical axis. More specifically, d1 and d2 can further satisfy: d1 / d2≤1.8. Satisfying d1 / d2≤2 is beneficial to increase the field angle.

[0124] In the example embodiment, at least one inflection point can be present on the first side surface and the second side surface of the seventh lens. The presence of the inflection point on the seventh lens helps to improve the resolution.

[0125] In the example embodiment, the optical lens of the present application can further include a filter and / or a protective glass disposed between the seventh lens and the second side surface of the optical lens, as needed, to filter light rays having different wavelengths and to prevent damage to elements (e.g., a chip) on the second side of the optical lens.

[0126] As known to those skilled in the art, cemented lenses can be used to minimize or eliminate chromatic aberration. The use of cemented lenses in the optical lens can improve image quality, reduce reflection loss of light energy, thereby achieving high resolution and improving the clarity of lens imaging. In addition, the use of cemented lenses can also simplify the assembly procedure in the lens manufacturing process.

[0127] In the example embodiment, the fifth lens and the sixth lens can be cemented to form a cemented lens. The fifth lens having positive refractive power and both the object side surface and the image side surface being convex, and the sixth lens having negative refractive power and the object side surface being concave, are cemented, which can smoothly transition the light emitted by the front lens to the second side surface of the optical lens, is conducive to making the structure of the optical lens compact, reducing the size of the optical lens, correcting various aberrations of the optical lens, reducing the tolerance sensitivity of each lens, improving the resolution, and optimizing the optical performance of distortion, CRA, etc. Of course, the fifth lens and the sixth lens can also not be cemented, which is conducive to improving the resolution capability.

[0128] The cemented manner between the lenses described above has at least one of the following advantages: reducing its own chromatic aberration, reducing tolerance sensitivity, balancing the overall chromatic aberration of the system through the residual partial chromatic aberration; reducing the spacing distance between the two lenses, thereby reducing the total length of the system; reducing the assembly components between the lenses, thereby reducing the process and cost; reducing the tilt / offset core tolerance sensitivity problem of the lens unit caused in the assembly process, improving the production yield; reducing the light quantity loss caused by reflection between the lenses, improving the illumination; further reducing the field curvature and correcting the off-axis point aberration of the system. Such cemented design shares the overall chromatic aberration correction of the system, effectively corrects the aberration to improve the resolution, and makes the optical system compact as a whole, meeting the miniaturization requirement.

[0129] In the example embodiments, the first lens to the seventh lens can be a spherical lens or an aspherical lens. For example, the first lens to the sixth lens can be a spherical lens; and the seventh lens can be an aspherical lens. Alternatively, the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens can be spherical lenses; and the second lens and the seventh lens can be aspherical lenses. The application does not specifically limit the specific number of the spherical lenses and the aspherical lenses. When the imaging quality is emphasized, the number of the aspherical lenses can be increased. In particular, in order to improve the resolving power of the optical lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can all be aspherical lenses. The aspherical lens has the characteristic that the curvature is continuously changed from the center of the lens to the periphery. Unlike the spherical lens which has constant curvature from the center of the lens to the periphery, the aspherical lens has better curvature radius characteristics, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After the aspherical lens is used, the aberration that occurs during imaging can be eliminated as much as possible, so as to improve the imaging quality of the lens. The arrangement of the aspherical lens helps to correct the system aberration and improve the resolving power.

[0130] The optical lens according to the above-mentioned embodiments of the application achieves at least one of the following beneficial effects: high resolving power (up to 8 million pixels), miniaturization, large field of view, small CRA, small distortion, good temperature performance, low cost and good imaging quality, etc. by reasonable arrangement of the shapes and focal lengths of the lenses. The optical lens can also well control the back focal shift when used in high and low temperature environments, so the optical lens can adapt to more severe use environments; at the same time, the optical lens is also conducive to greatly reducing the total length of the optical lens, realizing the miniaturization of the lens, and facilitating the assembly in limited space in some special fields.

[0131] The optical lens according to the above-mentioned embodiments of the application is provided with a cemented lens, which shares the overall chromatic aberration correction of the system, is conducive to correcting the system aberration, improving the system resolving power, reducing the tolerance sensitivity problem, and is also conducive to making the overall structure of the optical system compact, meeting the miniaturization requirement.

[0132] In the exemplary embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can all be glass lenses. Optical lenses made of glass can suppress the shift of the back focal length of the optical lens with temperature change, so as to improve the system stability. Meanwhile, the use of glass material can avoid the imaging blur of the lens caused by the high and low temperature change in the use environment, and affect the normal use of the lens. Specifically, when the image quality and reliability are focused on, the first lens to the seventh lens can all be glass aspherical lenses. Of course, in the application occasions with low temperature stability requirement, the first lens to the seventh lens in the optical lens can also be made of plastic. The use of plastic to make optical lenses can effectively reduce the manufacturing cost. Of course, the first lens to the seventh lens in the optical lens can also be made of plastic and glass.

[0133] However, those skilled in the art should understand that the number of lenses constituting the lens can be changed without departing from the technical solutions claimed by the present application, so as to obtain the various results and advantages described in the specification. For example, although the seven lenses are described as an example in the embodiments, the optical lens is not limited to including seven lenses. If necessary, the optical lens can also include other number of lenses. The specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0134] Example 1

[0135] The following refers to Figure 1 The optical lens according to Embodiment 1 of the present application is described. Figure 1 The structure schematic diagram of the optical lens according to Embodiment 1 of the present application is shown.

[0136] As Figure 1 shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the first side to the second side along the optical axis.

[0137] The first lens L1 is a convex-concave lens with negative refractive power, the first side S1 is a convex surface, and the second side S2 is a concave surface. The second lens L2 is a concave-convex lens with positive refractive power, the first side S3 is a concave surface, and the second side S4 is a convex surface. The third lens L3 is a concave-convex lens with negative refractive power, the first side S5 is a concave surface, and the second side S6 is a convex surface. The fourth lens L4 is a convex-concave lens with positive refractive power, the first side S8 is a convex surface, and the second side S9 is a concave surface. The fifth lens L5 is a double convex lens with positive refractive power, the first side S10 is a convex surface, and the second side S11 is a convex surface. The sixth lens L6 is a double concave lens with negative refractive power, the first side S11 is a concave surface, and the second side S12 is a concave surface. The seventh lens L7 is a convex-concave lens with positive refractive power, the first side S13 is a convex surface, and the second side S14 is a concave surface. The first side S13 and the second side S14 of the seventh lens L7 each have an inflection point.

[0138] The optical lens can further include a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged between the third lens L3 and the fourth lens L4 at a position close to the first side S8 of the fourth lens L4.

[0139] Alternatively, the optical lens can further include a filter L8 having a first side S15 and a second side S16. The filter L8 can be used to correct color deviation. The optical lens can further include a protective glass L9 having a first side S17 and a second side S18. The protective glass L9 can be used to protect the image sensor chip IMA located at the second side of the optical lens.

[0140] The optical lens provided by the present application can be used as, for example, a vehicle-mounted lens, in which case light from an object sequentially passes through each surface S1 to S18 and is finally imaged on the second side of the second side (i.e., the imaging surface), where an image sensor chip IMA is arranged. It should be understood that the optical lens provided by the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens, in which case light from the image source side sequentially passes through each surface S18 to S1 and is finally projected onto the first side of the first side (i.e., the projection surface, not shown), where an image sensor chip IMA is arranged.

[0141] Table 1 shows the radius of curvature R, the thickness d / distance T (it should be understood that the thickness d / distance T of the row where S1 is located is the central thickness d1 of the first lens L1, the thickness d / distance T of the row where S2 is located is the interval distance T12 between the first lens L1 and the second lens L2, and so on), the refractive index Nd, and the Abbe number Vd of each lens of the optical lens of Example 1.

[0142]

[0143] Table 1

[0144] In Embodiment 1, both the object-side surface S13 and the image-side surface S14 of the seventh lens L7 can be aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0145]

[0146] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for the aspherical mirrors S13 and S14 in Example 1.

[0147] Face number k A4 A6 A8 A10 A12 A14 A16 S13 11.2708 -2.5905E-03 -1.8678E-05 -3.7101E-06 1.1274E-07 -5.6687E-11 0.0000E+00 0.0000E+00 S14 96.6048 -1.7536E-03 -3.1589E-05 1.3371E-06 -4.5025E-08 1.3875E-09 0.0000E+00 0.0000E+00

[0148] Table 2

[0149] Example 2

[0150] The following is for reference Figure 2 An optical lens according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figure 2 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown.

[0151] like Figure 2 As shown, the optical lens includes, in sequence from the first side to the second side along the 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.

[0152] The first lens L1 is a convex-concave lens with negative focal power, the first side S1 is convex, and the second side S2 is concave. The second lens L2 is a concave-convex lens with positive focal power, the first side S3 is concave, and the second side S4 is convex. The third lens L3 is a concave-convex lens with negative focal power, the first side S5 is concave, and the second side S6 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, the first side S8 is convex, and the second side S9 is concave. The fifth lens L5 is a double-convex lens with positive focal power, the first side S10 is convex, and the second side S11 is convex. The sixth lens L6 is a double-concave lens with negative focal power, the first side S11 is concave, and the second side S12 is concave. The seventh lens L7 is a convex-concave lens with positive focal power, the first side S13 is convex, and the second side S14 is concave. The first side S13 and the second side S14 of the seventh lens L7 each have an inflection point.

[0153] The optical lens can further include a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged between the third lens L3 and the fourth lens L4 at a position close to the first side S8 of the fourth lens L4.

[0154] Alternatively, the optical lens can further include a filter L8 having a first side S15 and a second side S16. The filter L8 can be used to correct color deviation. The optical lens can further include a protective glass L9 having a first side S17 and a second side S18. The protective glass L9 can be used to protect the image sensor chip IMA located at the second side of the optical lens.

[0155] The optical lens provided by the present application can be used as, for example, a vehicle-mounted lens, at which time the light from the object sequentially passes through each surface S1 to S18 and is finally imaged on the second side of the second side (i.e., the imaging surface), wherein the imaging surface is provided with an image sensor chip IMA. It should be understood that the optical lens provided by the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens, at which time the light from the image source side sequentially passes through each surface S18 to S1 and is finally projected onto the first side of the first side (i.e., the projection surface, not shown), wherein the image source surface is provided with an image sensor chip IMA.

[0156] Table 3 shows the curvature radius R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 2. Table 4 shows the conic coefficient and high-order term coefficient that can be used for each aspheric surface in Example 2, wherein each aspheric surface can be defined by the formula (1) given in Example 1 above.

[0157]

[0158]

[0159] Table 3

[0160] Face number k A4 A6 A8 A10 A12 A14 A16 S13 10.8292 -2.6096E-03 -1.9935E-05 -3.7268E-06 1.1191E-07 7.6986E-11 0.0000E+00 0.0000E+00 S14 -82.8389 -1.7630E-03 -3.2268E-05 1.3280E-06 -4.4991E-08 1.4621E-09 0.0000E+00 0.0000E+00

[0161] Table 4

[0162] Example 3

[0163] The following is for reference Figure 3 An optical lens according to Embodiment 3 of this application is described. Figure 3 A schematic diagram of the structure of an optical lens according to Embodiment 3 of this application is shown.

[0164] like Figure 3 As shown, the optical lens includes, in sequence from the first side to the second side along the 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.

[0165] The first lens L1 is a convex-concave lens with negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 is a concave-convex lens with positive optical power, its first side surface S3 is concave, and its second side surface S4 is convex. The third lens L3 is a concave-convex lens with negative optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive optical power, its first side surface S8 is convex, and its second side surface S9 is convex. The fifth lens L5 is a biconvex lens with positive optical power, its first side surface S10 is convex, and its second side surface S11 is convex. The sixth lens L6 is a biconcave lens with negative optical power, its first side surface S11 is concave, and its second side surface S12 is concave. The seventh lens L7 is a convex-concave lens with positive optical power, its first side surface S13 is convex, and its second side surface S14 is concave. The seventh lens L7 has inflection points on both its first side surface S13 and its second side surface S14.

[0166] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned between the third lens L3 and the fourth lens L4 near the first side surface S8 of the fourth lens L4.

[0167] Optionally, the optical lens may also include a filter L8 having a first side surface S15 and a second side surface S16. The filter L8 can be used to correct color aberrations. The optical lens may also include a protective glass L9 having a first side surface S17 and a second side surface S18. The protective glass L9 can be used to protect the image sensor chip IMA located on the second side surface of the optical lens.

[0168] The optical lens provided in the application can be used as, for example, a vehicle-mounted lens, in which case light from an object sequentially passes through each surface S1 to S18 and is finally imaged on a second side surface (i.e., an imaging surface) provided on the second side, wherein the imaging surface is provided with an image sensing chip IMA. It should be understood that the optical lens provided in the application can also be used as, for example, a projection lens or a laser radar transmitting end lens, in which case light from an image source side sequentially passes through each surface S18 to S1 and is finally projected onto a first side surface (i.e., a projection surface, not shown) provided on the first side, wherein the image source surface is provided with an image sensing chip IMA.

[0169] Table 5 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 3. Table 6 shows the conic coefficient and high-order term coefficient that can be used for each aspherical surface in Example 3, wherein each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0170]

[0171] Table 5

[0172] Face number k A4 A6 A8 A10 A12 A14 A16 S13 4.7677 -2.2569E-03 -2.6116E-05 -1.7342E-06 -7.2756E-09 3.8561E-09 0.0000E+00 0.0000E+00 S14 -98.0569 -1.4609E-03 -3.7869E-05 1.5945E-06 -6.8122E-08 2.5050E-09 0.0000E+00 0.0000E+00

[0173] Table 6

[0174] Example 4

[0175] The following refers to Figure 4 An optical lens according to Example 4 of the application is described. Figure 4 A structural schematic diagram of the optical lens according to Example 4 of the application is shown.

[0176] As Figure 4 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis from the first side to the second side.

[0177] The first lens L1 is a convex-concave lens with negative focal power, the first side S1 is convex, and the second side S2 is concave. The second lens L2 is a concave-convex lens with positive focal power, the first side S3 is concave, and the second side S4 is convex. The third lens L3 is a concave-convex lens with negative focal power, the first side S5 is concave, and the second side S6 is convex. The fourth lens L4 is a double-convex lens with positive focal power, the first side S8 is convex, and the second side S9 is convex. The fifth lens L5 is a double-convex lens with positive focal power, the first side S10 is convex, and the second side S11 is convex. The sixth lens L6 is a double-concave lens with negative focal power, the first side S11 is concave, and the second side S12 is concave. The seventh lens L7 is a convex-concave lens with positive focal power, the first side S13 is convex, and the second side S14 is concave. The first side S13 and the second side S14 of the seventh lens L7 each have an inflection point.

[0178] The optical lens can further include a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged between the third lens L3 and the fourth lens L4 at a position close to the first side S8 of the fourth lens L4.

[0179] Alternatively, the optical lens can further include a filter L8 having a first side S15 and a second side S16. The filter L8 can be used to correct color deviation. The optical lens can further include a protective glass L9 having a first side S17 and a second side S18. The protective glass L9 can be used to protect the image sensor chip IMA located at the second side of the optical lens.

[0180] The optical lens provided by the present application can be used as, for example, a vehicle-mounted lens, in which case light from an object sequentially passes through each surface S1 to S18 and is finally imaged on the second side of the second side (i.e., the imaging surface), wherein the imaging surface is provided with an image sensor chip IMA. It should be understood that the optical lens provided by the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens, in which case light from the image source side sequentially passes through each surface S18 to S1 and is finally projected onto the first side of the first side (i.e., the projection surface, not shown), wherein the image source surface is provided with an image sensor chip IMA.

[0181] Table 7 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 4. Table 8 shows the conic coefficient and high-order term coefficient that can be used for each aspheric surface in Example 4, wherein each aspheric surface can be defined by the formula (1) given in Example 1 above.

[0182]

[0183]

[0184] Table 7

[0185] Face number k A4 A6 A8 A10 A12 A14 A16 S13 5.1187 -2.2793E-03 -2.8707E-05 -1.8737E-06 -2.0100E-08 3.5677E-09 0.0000E+00 0.0000E+00 S14 100.0000 -1.4356E-03 -3.9986E-05 1.5138E-06 -6.7509E-08 2.2871E-09 0.0000E+00 0.0000E+00

[0186] Table 8

[0187] Example 5

[0188] The following is for reference Figure 5 An optical lens according to Embodiment 5 of this application is described. Figure 5 A schematic diagram of the structure of an optical lens according to Embodiment 5 of this application is shown.

[0189] like Figure 5 As shown, the optical lens includes, in sequence from the first side to the second side along the 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.

[0190] The first lens L1 is a convex-concave lens with negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens L2 is a concave-convex lens with positive optical power, its first side surface S3 is concave, and its second side surface S4 is convex. The third lens L3 is a concave-convex lens with negative optical power, its first side surface S5 is concave, and its second side surface S6 is convex. The fourth lens L4 is a convex-concave lens with positive optical power, its first side surface S8 is convex, and its second side surface S9 is concave. The fifth lens L5 is a biconvex lens with positive optical power, its first side surface S10 is convex, and its second side surface S11 is convex. The sixth lens L6 is a concave-convex lens with negative optical power, its first side surface S11 is concave, and its second side surface S12 is convex. The seventh lens L7 is a convex-concave lens with positive optical power, its first side surface S13 is convex, and its second side surface S14 is concave. The seventh lens L7 has inflection points on both its first side surface S13 and its second side surface S14.

[0191] The optical lens may also include an aperture stop STO, which may be positioned between the third lens L3 and the fourth lens L4 to improve image quality. For example, the aperture stop STO may be positioned between the third lens L3 and the fourth lens L4 near the first side surface S8 of the fourth lens L4.

[0192] Optionally, the optical lens may also include a filter L8 having a first side surface S15 and a second side surface S16. The filter L8 can be used to correct color aberrations. The optical lens may also include a protective glass L9 having a first side surface S17 and a second side surface S18. The protective glass L9 can be used to protect the image sensor chip IMA located on the second side surface of the optical lens.

[0193] The optical lens provided in the application can be used as, for example, a vehicle-mounted lens, in which case light from an object sequentially passes through each surface S1 to S18 and is finally imaged on a second side surface (i.e., an imaging surface) provided on the second side, wherein the imaging surface is provided with an image sensing chip IMA. It should be understood that the optical lens provided in the application can also be used as, for example, a projection lens or a laser radar transmitting end lens, in which case light from an image source side sequentially passes through each surface S18 to S1 and is finally projected onto a first side surface (i.e., a projection surface, not shown) provided on the first side, wherein the image source surface is provided with an image sensing chip IMA.

[0194] Table 9 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 5. Table 10 shows the conic coefficient and high-order term coefficient that can be used for each aspherical surface of Example 5, wherein each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0195]

[0196] Table 9

[0197] Face number k A4 A6 A8 A10 A12 A14 A16 S13 11.5751 -2.1502E-03 3.6959E-06 -2.4659E-06 1.1478E-07 -1.2525E-09 0.0000E+00 0.0000E+00 S14 53.8021 -1.8841E-03 -1.4012E-05 1.5396E-06 -5.9764E-08 1.3468E-09 0.0000E+00 0.0000E+00

[0198] Table 10

[0199] Example 6

[0200] The following refers to Figure 6 An optical lens according to Example 6 of the application is described. Figure 6 A structural schematic diagram of the optical lens according to Example 6 of the application is shown.

[0201] As Figure 6 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis from the first side to the second side.

[0202] The first lens L1 is a convex-concave lens with negative refractive power, the first side S1 is a convex surface, and the second side S2 is a concave surface. The second lens L2 is a concave-convex lens with positive refractive power, the first side S3 is a concave surface, and the second side S4 is a convex surface. The third lens L3 is a concave-convex lens with negative refractive power, the first side S5 is a concave surface, and the second side S6 is a convex surface. The fourth lens L4 is a convex-concave lens with positive refractive power, the first side S8 is a convex surface, and the second side S9 is a concave surface. The fifth lens L5 is a biconvex lens with positive refractive power, the first side S10 is a convex surface, and the second side S11 is a convex surface. The sixth lens L6 is a concave-convex lens with negative refractive power, the first side S11 is a concave surface, and the second side S12 is a convex surface. The seventh lens L7 is a convex-concave lens with positive refractive power, the first side S13 is a convex surface, and the second side S14 is a concave surface. The first side S13 and the second side S14 of the seventh lens L7 each have an inflection point.

[0203] The optical lens can further include a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged between the third lens L3 and the fourth lens L4 at a position close to the first side S8 of the fourth lens L4.

[0204] Alternatively, the optical lens can further include a filter L8 having a first side S15 and a second side S16. The filter L8 can be used to correct color deviation. The optical lens can further include a protective glass L9 having a first side S17 and a second side S18. The protective glass L9 can be used to protect the image sensor chip IMA located at the second side of the optical lens.

[0205] The optical lens provided by the present application can be used as, for example, a vehicle-mounted lens, in which case light from an object sequentially passes through each surface S1 to S18 and is finally imaged on the second side of the second side (i.e., the imaging surface), where an image sensor chip IMA is arranged. It should be understood that the optical lens provided by the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens, in which case light from an image source side sequentially passes through each surface S18 to S1 and is finally projected onto the first side of the first side (i.e., the projection surface, not shown), where an image sensor chip IMA is arranged.

[0206] Table 11 shows the radius of curvature R, the thickness d / distance T, the refractive index Nd, and the Abbe number Vd of each lens of the optical lens of Example 6. Table 12 shows the conic coefficient and the high-order term coefficient that can be used for each aspheric surface in Example 6, wherein each aspheric surface can be defined by the formula (1) given in Example 1 above.

[0207]

[0208]

[0209] Table 11

[0210] Face number k A4 A6 A8 A10 A12 A14 A16 S13 10.7872 -2.4560E-03 -1.5545E-05 -3.1736E-06 1.0320E-07 -5.3081E-10 0.0000E+00 0.0000E+00 S14 73.5447 -1.7757E-03 -2.9094E-05 1.4458E-06 -5.0284E-08 1.4286E-09 0.0000E+00 0.0000E+00

[0211] Table 12

[0212] Example 7

[0213] An optical lens according to Embodiment 7 of the present application is described below. Figure 7 An optical lens according to Embodiment 7 of the present application is described below. Figure 7 An optical lens according to Embodiment 7 of the present application is described below.

[0214] As shown in Figure 7 The optical lens comprises, in order from the first side to the second side along the 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.

[0215] The first lens L1 is a convex-concave lens with negative focal power, the first side S1 of which is a convex surface and the second side S2 of which is a concave surface. The second lens L2 is a concave-convex lens with positive focal power, the first side S3 of which is a concave surface and the second side S4 of which is a convex surface. The third lens L3 is a concave-convex lens with positive focal power, the first side S5 of which is a concave surface and the second side S6 of which is a convex surface. The fourth lens L4 is a double convex lens with positive focal power, the first side S8 of which is a convex surface and the second side S9 of which is a convex surface. The fifth lens L5 is a double convex lens with positive focal power, the first side S10 of which is a convex surface and the second side S11 of which is a convex surface. The sixth lens L6 is a double concave lens with negative focal power, the first side S11 of which is a concave surface and the second side S12 of which is a concave surface. The seventh lens L7 is a double convex lens with positive focal power, the first side S13 of which is a convex surface and the second side S14 of which is a convex surface. The second side S14 of the seventh lens L7 has a reverse point.

[0216] The optical lens can further comprise a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged at a position between the third lens L3 and the fourth lens L4 close to the first side S8 of the fourth lens L4.

[0217] Optionally, the optical lens can further comprise a filter L8 having a first side S15 and a second side S16. The filter L8 can be used to correct color deviation. The optical lens can further comprise a protective glass L9 having a first side S17 and a second side S18. The protective glass L9 can be used to protect the image sensor chip IMA located at the second side of the optical lens.

[0218] The optical lens provided in the application can be used as, for example, a vehicle-mounted lens, in which case light from an object sequentially passes through each surface S1 to S18 and is finally imaged on a second side surface (i.e., an imaging surface) provided on the second side, wherein the imaging surface is provided with an image sensing chip IMA. It should be understood that the optical lens provided in the application can also be used as, for example, a projection lens or a laser radar transmitting end lens, in which case light from an image source side sequentially passes through each surface S18 to S1 and is finally projected onto a first side surface (i.e., a projection surface, not shown) provided on the first side, wherein the image source surface is provided with an image sensing chip IMA.

[0219] Table 13 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 7. Table 14 shows the conic coefficient and high-order term coefficient that can be used for each aspherical surface in Example 7, wherein each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0220]

[0221] Table 13

[0222] Face number k A4 A6 A8 A10 A12 A14 A16 S5 -1.7649 -9.5036E-04 4.0485E-06 -1.2683E-06 8.0388E-08 -2.2498E-09 0.0000E+00 0.0000E+00 S6 2.2893 1.9384E-04 8.8865E-06 1.8526E-07 -1.8666E-09 4.2201E-10 0.0000E+00 0.0000E+00 S13 0.9377 -5.6921E-04 2.7497E-05 -1.5983E-06 5.1785E-08 -9.4838E-10 0.0000E+00 0.0000E+00 S14 274.8884 9.8623E-04 3.0278E-05 1.3253E-06 -8.2038E-08 3.1318E-09 0.0000E+00 0.0000E+00

[0223] Table 14

[0224] Example 8

[0225] The following refers to Figure 8 An optical lens according to Example 8 of the application is described. Figure 8 A structural schematic diagram of the optical lens according to Example 8 of the application is shown.

[0226] As Figure 8 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 along the optical axis from the first side to the second side.

[0227] The first lens L1 is a convex-concave lens with negative focal power, the first side S1 is convex, and the second side S2 is concave. The second lens L2 is a concave-convex lens with positive focal power, the first side S3 is concave, and the second side S4 is convex. The third lens L3 is a concave-convex lens with positive focal power, the first side S5 is concave, and the second side S6 is convex. The fourth lens L4 is a double-convex lens with positive focal power, the first side S8 is convex, and the second side S9 is convex. The fifth lens L5 is a double-convex lens with positive focal power, the first side S10 is convex, and the second side S11 is convex. The sixth lens L6 is a double-concave lens with negative focal power, the first side S11 is concave, and the second side S12 is concave. The seventh lens L7 is a double-convex lens with positive focal power, the first side S13 is convex, and the second side S14 is convex. The second side S14 of the seventh lens L7 has a reverse point.

[0228] The optical lens can further include a stop STO, which can be arranged between the third lens L3 and the fourth lens L4 to improve the imaging quality. For example, the stop STO can be arranged between the third lens L3 and the fourth lens L4 at a position close to the first side S8 of the fourth lens L4.

[0229] Optionally, the optical lens can further include a filter L8 having a first side S15 and a second side S16. The filter L8 can be used to correct color deviation. The optical lens can further include a protective glass L9 having a first side S17 and a second side S18. The protective glass L9 can be used to protect the image sensor chip IMA located at the second side of the optical lens.

[0230] The optical lens provided by the present application can be used as, for example, a vehicle-mounted lens, in which case the light from the object sequentially passes through each surface S1 to S18 and is finally imaged on the second side of the second side (i.e. the imaging surface), wherein the imaging surface is provided with an image sensor chip IMA. It should be understood that the optical lens provided by the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens, in which case the light from the image source side sequentially passes through each surface S18 to S1 and is finally projected onto the first side of the first side (i.e. the projection surface, not shown), wherein the image source surface is provided with an image sensor chip IMA.

[0231] Table 15 shows the radius of curvature R, thickness d / distance T, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 8. Table 16 shows the conic coefficient and high-order term coefficient that can be used for each aspheric surface in Example 8, wherein each aspheric surface can be defined by the formula (1) given in Example 1 above.

[0232]

[0233]

[0234] Table 15

[0235] Face number k A4 A6 A8 A10 A12 A14 A16 S5 -1.7929 -9.4626E-04 4.0182E-06 -1.2578E-06 8.2399E-08 -2.0549E-09 1.5539E-11 1.3145E-12 S6 2.2781 1.9258E-04 9.8280E-06 2.0949E-07 -2.8925E-09 3.2154E-10 -3.7483E-13 6.9851E-13 S13 0.9624 -5.6296E-04 2.9525E-05 -1.5042E-06 5.4465E-08 -9.4513E-10 -6.3052E-12 -5.7785E-13 S14 256.0790 9.7401E-04 3.1084E-05 1.5044E-06 -7.2336E-08 3.3926E-09 -7.1904E-12 -1.6548E-12

[0236] Table 16

[0237] In summary, Embodiment 1 to Embodiment 8 respectively satisfy the relationships shown in Table 17-1 and Table 17-2 below. In Table 17-1 and Table 17-2, the units of D, H, F, BFL, TTL, F1, F2, F3, F4, F5, F6, F7, R1, R2, R3, R4, T12, d1, d2 are millimeters (mm), the unit of FOV is degree (°), and the unit of θ is radian (rad).

[0238]

[0239]

[0240] Table 17-1

[0241]

[0242]

[0243] Table 17-2

[0244] The present application also provides an electronic device, which can include the optical lens according to the above 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 can be a standalone electronic device such as a distance detection camera, or an imaging module integrated on a distance detection device such as an auxiliary driving system. In addition, the electronic device can also be a standalone imaging device such as a vehicle-mounted camera, or an imaging module integrated on an auxiliary driving system.

[0245] The above description is merely preferred embodiments of the present application and a principle of applied technologies. It should be understood by those skilled in the art that the inventive scope of the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and also covers other technical solutions formed by any combinations of the above technical features or equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical lens characterized in that, The optical lens comprises, in sequence from a first side to a second side along an optical axis: a first lens with negative refractive power, a first side of which is convex and a second side of which is concave; a second lens with positive refractive power, a first side of which is concave and a second side of which is convex; a third lens with refractive power, a first side of which is concave and a second side of which is convex; a fourth lens with positive refractive power, a first side of which is convex; a fifth lens with positive refractive power, a first side of which is convex and a second side of which is convex; a sixth lens with negative refractive power, a first side of which is concave; and a seventh lens with positive refractive power, a first side of which is convex; wherein the number of lenses with refractive power in the optical lens is seven; the first side is an object side and the second side is an image side, or the first side is an imaging side and the second side is an image source side; an effective focal length F2 of the second lens and a total effective focal length F of the optical lens satisfy: 9.782≤|F2 / F|≤60; and a back focal length BFL of the optical lens and a total length TTL of the optical lens satisfy: 0.12≤BFL / TTL≤0.163; an effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: 2.600≤|F4 / F|≤8; a curvature radius R2 of the second side of the first lens and a curvature radius R3 of the first side of the second lens satisfy: -10≤(R2-R3) / (R2+R3)≤1.

2. The optical lens of claim 1, wherein, The third lens has positive refractive power or negative refractive power.

3. The optical lens of claim 1, wherein, The second side of the fourth lens is concave.

4. The optical lens of claim 1, wherein, The second side of the fourth lens is convex.

5. The optical lens of claim 1, wherein, The second side of the sixth lens is concave.

6. The optical lens of claim 1, wherein, The second side of the sixth lens is convex.

7. The optical lens of claim 1, wherein, The second side of the seventh lens is concave.

8. The optical lens of claim 1, wherein, The second side of the seventh lens is convex.

9. The optical lens of any of claims 1-8, wherein, A total length TTL of the optical lens, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens satisfy: 0.032≤TTL / H / FOV×1°≤0.

06.

10. The optical lens of any of claims 1-8, wherein, A curvature radius R1 of the first side of the first lens and a curvature radius R2 of the second side of the first lens satisfy: 3.086≤R1 / R2≤6.

11. The optical lens of any of claims 1-8, wherein, A maximum field of view θ of the optical lens in radians, a maximum entrance pupil diameter D of the first side of the first lens corresponding to the maximum field of view of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens satisfy: 0.653≤D / H / θ≤2.

12. The optical lens of any of claims 1-8, wherein, An effective focal length F5 of the fifth lens and an effective focal length F6 of the sixth lens satisfy: 0.771≤|F5 / F6|≤4.

13. The optical lens of any of claims 1-8, wherein, A maximum field of view 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 of view of the optical lens satisfy: 59.453°≥(FOV×F) / H≥40°.

14. The optical lens of any of claims 1-8, wherein, A curvature radius R3 of the first side of the second lens and a curvature radius R4 of the second side of the second lens satisfy: 0.894≤|R3 / R4|≤4.

15. The optical lens of any of claims 1-8, wherein, A distance T12 on the optical axis from a center of a second side surface of the first lens to a center of a first side surface of the second lens and a total length TTL of the optical lens satisfy: 0.112≤T12 / TTL≤0.

35.

16. The optical lens of any of claims 1-8, wherein, A curvature radius R1 of the first side surface of the first lens and a total effective focal length F of the optical lens satisfy: 0.367≥|F / R1|≥0.

05.

17. The optical lens of any of claims 1-8, wherein, The total length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 6.850≤TTL / F≤15.

18. The optical lens of any of claims 1-8, wherein, An effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: 1.726≤|F1 / F|≤4.

19. The optical lens of any of claims 1-8, wherein, An effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: 2.600≤|F4 / F|≤3.

138.

20. The optical lens of any of claims 1-8, wherein, An effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 2.484≤|F7 / F|≤18.

21. The optical lens of any of claims 1-8, wherein, A curvature radius R2 of the second side surface of the first lens and a curvature radius R3 of the first side surface of the second lens satisfy: -3.586≤(R2-R3) / (R2+R3)≤-2.

586.

22. The optical lens of any of claims 1-8, wherein, A center thickness dn on the optical axis of an nth lens with a maximum center thickness among the first lens to the seventh lens and a center thickness dm on the optical axis of an mth lens with a minimum center thickness among the first lens to the seventh lens satisfy: 0.9≤dn / dm≤10, where n, m=1, 2, 3, 4, 5, 6, 7.

23. The optical lens of any of claims 1-8, wherein, An image height H corresponding to a maximum field angle of view of the optical lens and the total length TTL of the optical lens satisfy: 3.594≤TTL / H≤6.

24. The optical lens of any of claims 1-8, wherein, An opening angle arctan(1 / K2) of the second side surface of the first lens corresponding to a maximum field angle of view of the optical lens satisfy: 66.283°≥arctan(1 / K2)≥50°.

25. The optical lens of any of claims 1-8, wherein, A center thickness d1 on the optical axis of the first lens and a center thickness d2 on the optical axis of the second lens satisfy: 0.187≤d1 / d2≤2.

26. The optical lens of any of claims 1-8, wherein, The fifth lens and the sixth lens are cemented to form a cemented lens.

27. The optical lens of any of claims 1-8, wherein, The first side surface and the second side surface of the seventh lens have at least one inflection point.

28. The optical lens of any of claims 1-8, wherein, The optical lens further comprises a diaphragm arranged between the third lens and the fourth lens.

29. The optical lens of any of claims 1-8, wherein, At least one mirror surface among an object side surface of the first lens to an image side surface of the seventh lens is an aspherical mirror surface.

30. An electronic device, comprising: An imaging element for converting an optical image formed by the optical lens into an electric signal.

Images