Optical lenses and electronic equipment

Abstract

The present application discloses an optical lens and an electronic device including the optical lens. The optical lens includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power, whose object side surface is concave and whose image side surface is concave; a second lens with positive optical power, whose object side surface is convex; a third lens with positive optical power, whose object side surface is convex and whose image side surface is convex; a fourth lens with positive optical power, whose object side surface is convex; a fifth lens with negative optical power, whose image side surface is concave; a sixth lens with positive optical power, whose object side surface is convex; and a seventh lens with negative optical power.

Description

Technical Field

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

[0002] In recent years, with the rapid development of automobile assisted driving systems, optical lenses are increasingly used in automobiles. At the same time, users have higher and higher requirements for the pixels of optical lenses. In order to meet the application needs of automotive lenses, more and more lens manufacturers have begun to study how to improve the recognition of traffic lights by automotive front-view lenses. In addition, for safety reasons, optical lenses used as automotive front-view lenses also need to have high imaging performance.

[0003] At present, in order to improve the resolution of existing automotive optical lenses, most lens manufacturers usually increase the number of lenses to achieve the improvement of lens resolution, but this will affect the miniaturization characteristics of the lens to a certain extent. In addition, considering the special application scenarios of automotive lenses, the optical lens used as a front-view lens for vehicles also needs to have excellent performance in chromatic aberration so that it can accurately identify red and green lights, thereby facilitating safe driving of vehicles. Summary of the invention

[0004] On one hand, the present application provides an optical lens. The optical lens includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power, whose object side surface is concave and whose image side surface is concave; a second lens with positive optical power, whose object side surface is convex; a third lens with positive optical power, whose object side surface is convex and whose image side surface is convex; a fourth lens with positive optical power, whose object side surface is convex; a fifth lens with negative optical power, whose image side surface is concave; a sixth lens with positive optical power, whose object side surface is convex; and a seventh lens with negative optical power.

[0005] In one embodiment, the image-side surface of the second lens is concave.

[0006] In one embodiment, the image-side surface of the second lens is convex.

[0007] In one embodiment, the image-side surface of the fourth lens is concave.

[0008] In one embodiment, the image-side surface of the fourth lens is a convex surface.

[0009] In one embodiment, the object-side surface of the fifth lens is a convex surface.

[0010] In one embodiment, the object-side surface of the fifth lens is concave.

[0011] In one embodiment, the image-side surface of the sixth lens is concave.

[0012] In one embodiment, the image-side surface of the sixth lens is a convex surface.

[0013] In one embodiment, the object-side surface of the seventh lens element is concave, and the image-side surface is convex.

[0014] In one embodiment, the object-side surface of the seventh lens element is a concave surface or a convex surface, and the image-side surface is a concave surface.

[0015] In one embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens.

[0016] In one embodiment, the second lens and the seventh lens have aspherical mirror surfaces.

[0017] In one embodiment, the optical lens further includes an aperture stop disposed between the second lens and the third lens.

[0018] In one embodiment, the optical lens further includes a stop disposed between the first lens and the second lens.

[0019] In one embodiment, the distance TTL from the center of the object-side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens may satisfy: TTL / F≤2.5.

[0020] In one embodiment, the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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 may satisfy: TTL / H / FOV≤0.7.

[0021] In one embodiment, the Abbe number VD3 of the third lens and the Abbe number VD4 of the fourth lens may satisfy: VD3+VD4≥110.

[0022] In one 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 may satisfy: (FOV×F) / H≥50°.

[0023] In one embodiment, a distance BFL from the center of the image-side surface of the seventh lens to the imaging surface of the optical lens on the optical axis and a distance TTL from the center of the object-side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: BFL / TTL≥0.07.

[0024] In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F5 of the fifth lens may satisfy: 1≤|F4 / F5|≤2.

[0025] In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens may satisfy: 1≤|F3 / F|≤2.

[0026] In one embodiment, the effective focal length F45 of the cemented lens formed by cementing the fourth lens and the fifth lens and the total effective focal length F of the optical lens may satisfy the following: 1≤|F45 / F|≤10.

[0027] In one embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens, and the optical lens may satisfy: 1≤dn / dm≤2, wherein dn is the center thickness of the lens with the largest center thickness among the second lens, the third lens, and the cemented lens; and dm is the center thickness of the lens with the smallest center thickness among the second lens, the third lens, and the cemented lens.

[0028] In one embodiment, a curvature radius R6 of the object-side surface of the third lens and a curvature radius R7 of the image-side surface of the third lens may satisfy: 0.5≤|R6 / R7|≤2.

[0029] In one embodiment, a curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis may satisfy: 0.1≤|R1 / (R2+d1)|≤1.

[0030] In one embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens may satisfy: F / ENPD≤2.

[0031] In one embodiment, the distance SAG41 on the optical axis from the maximum clear semi-aperture D41 of the object side surface of the fourth lens corresponding to the maximum field of view angle of the optical lens and the intersection of the object side surface of the fourth lens and the optical axis to the maximum clear aperture of the object side surface of the fourth lens may satisfy: arctan(SAG41 / D41)≤30.

[0032] In one embodiment, the total effective focal length F of the optical lens and the curvature radius R1 of the object side surface of the first lens may satisfy: 0.5≤R1 / F≤2.

[0033] In one embodiment, the center thickness d4 of the fourth lens on the optical axis, the center thickness d5 of the fifth lens on the optical axis, and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: (d4+d5) / TTL≤0.3.

[0034] In one embodiment, the maximum field angle θ of the optical lens in radians, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: |(HF×θ) / (F×θ)|≤0.2.

[0035] On the other hand, the present application provides an optical lens. The optical lens includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens with positive optical power; a third lens with positive optical power; a fourth lens with positive optical power; a fifth lens with negative optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power. The distance BFL from the center of the image side surface of the seventh lens to the imaging surface of the optical lens on the optical axis and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis can satisfy: BFL / TTL≥0.07.

[0036] In one embodiment, the object-side surface of the first lens is concave, and the image-side surface is concave.

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

[0038] In one embodiment, the object-side surface of the second lens is convex, and the image-side surface is convex.

[0039] In one embodiment, the object-side surface of the third lens is convex, and the image-side surface is convex.

[0040] In one embodiment, the object-side surface of the fourth lens is convex, and the image-side surface is concave.

[0041] In one embodiment, the object-side surface of the fourth lens is convex, and the image-side surface is convex.

[0042] In one embodiment, the object-side surface of the fifth lens is convex, and the image-side surface is concave.

[0043] In one embodiment, the object-side surface of the fifth lens element is concave, and the image-side surface is concave.

[0044] In one embodiment, the object-side surface of the sixth lens is convex, and the image-side surface is concave.

[0045] In one embodiment, the object-side surface of the sixth lens is convex, and the image-side surface is convex.

[0046] In one embodiment, the object-side surface of the seventh lens element is concave, and the image-side surface is convex.

[0047] In one embodiment, the object-side surface of the seventh lens element is a concave surface or a convex surface, and the image-side surface is a concave surface.

[0048] In one embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens.

[0049] In one embodiment, the second lens and the seventh lens have aspherical mirror surfaces.

[0050] In one embodiment, the optical lens further includes an aperture stop disposed between the second lens and the third lens.

[0051] In one embodiment, the optical lens further includes a stop disposed between the first lens and the second lens.

[0052] In one embodiment, the distance TTL from the center of the object-side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens may satisfy: TTL / F≤2.5.

[0053] In one embodiment, the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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 may satisfy: TTL / H / FOV≤0.7.

[0054] In one embodiment, the Abbe number VD3 of the third lens and the Abbe number VD4 of the fourth lens may satisfy: VD3+VD4≥110.

[0055] In one 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 may satisfy: (FOV×F) / H≥50°.

[0056] In one embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens may satisfy: F / ENPD≤2.

[0057] In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F5 of the fifth lens may satisfy: 1≤|F4 / F5|≤2.

[0058] In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens may satisfy: 1≤|F3 / F|≤2.

[0059] In one embodiment, the effective focal length F45 of the cemented lens formed by cementing the fourth lens and the fifth lens and the total effective focal length F of the optical lens may satisfy the following: 1≤|F45 / F|≤10.

[0060] In one embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens, and the optical lens may satisfy: 1≤dn / dm≤2, wherein dn is the center thickness of the lens with the largest center thickness among the second lens, the third lens, and the cemented lens; and dm is the center thickness of the lens with the smallest center thickness among the second lens, the third lens, and the cemented lens.

[0061] In one embodiment, a curvature radius R6 of the object-side surface of the third lens and a curvature radius R7 of the image-side surface of the third lens may satisfy: 0.5≤|R6 / R7|≤2.

[0062] In one embodiment, a curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis may satisfy: 0.1≤|R1 / (R2+d1)|≤1.

[0063] In one embodiment, the distance SAG41 on the optical axis from the maximum clear semi-aperture D41 of the object side surface of the fourth lens corresponding to the maximum field of view angle of the optical lens and the intersection of the object side surface of the fourth lens and the optical axis to the maximum clear aperture of the object side surface of the fourth lens may satisfy: arctan(SAG41 / D41)≤30.

[0064] In one embodiment, the total effective focal length F of the optical lens and the curvature radius R1 of the object side surface of the first lens may satisfy: 0.5≤R1 / F≤2.

[0065] In one embodiment, the center thickness d4 of the fourth lens on the optical axis, the center thickness d5 of the fifth lens on the optical axis, and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: (d4+d5) / TTL≤0.3.

[0066] In one embodiment, the maximum field angle θ of the optical lens in radians, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: |(HF×θ) / (F×θ)|≤0.2.

[0067] Another aspect of the present application provides an electronic device, which includes 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.

[0068] The present application adopts seven lenses, and by optimizing the shape, optical focal length, etc. of each lens, the optical lens has at least one beneficial effect of high resolution, miniaturization, small front port diameter, back focal length, small chromatic aberration, low cost, small CRA and good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0070] Figure 1 A schematic diagram showing the structure of an optical lens according to Embodiment 1 of the present application;

[0071] Figure 2A schematic diagram showing the structure of an optical lens according to Embodiment 2 of the present application;

[0072] Figure 3 A schematic diagram showing the structure of an optical lens according to Embodiment 3 of the present application;

[0073] Figure 4 A schematic diagram showing the structure of an optical lens according to Embodiment 4 of the present application;

[0074] Figure 5 A schematic diagram showing the structure of an optical lens according to Embodiment 5 of the present application;

[0075] Figure 6 A schematic diagram showing the structure of an optical lens according to Embodiment 6 of the present application; and

[0076] Figure 7 A schematic diagram showing the structure of an optical lens according to Example 7 of the present application. DETAILED DESCRIPTION

[0077] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0078] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0079] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0080] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens.

[0081] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0082] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0083] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0084] The features, principles and other aspects of the present application are described in detail below.

[0085] In an exemplary embodiment, the optical lens includes, for example, seven lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in sequence from the object side to the image side along the optical axis.

[0086] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0087] In an exemplary embodiment, the first lens may have a negative optical power. The first lens may have a biconcave surface. Such an optical power and surface configuration of the first lens can not only allow light to enter the rear optical system accurately and smoothly, thereby improving the resolution quality, but also collect light of a large field of view as much as possible, thereby increasing the amount of light passing through. The first lens may be a spherical lens. The first lens is a spherical lens, which can easily add a waterproof film to the first lens and can also reduce the processing cost.

[0088] In an exemplary embodiment, the second lens may have a positive optical power. The second lens may have a convex-concave surface or a biconvex surface. Such an optical power and surface configuration of the second lens is conducive to light convergence, and is conducive to reducing the aperture and length of the optical lens barrel, thereby achieving miniaturization. Preferably, the second lens may be an aspherical lens.

[0089] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a biconvex surface. Such optical power and surface configuration of the third lens is conducive to light convergence, and is conducive to reducing the diameter and length of the optical lens barrel, thereby achieving miniaturization.

[0090] In exemplary embodiments, the fourth lens may have positive power.The fourth lens may have a biconvex type or a convex-concave type.

[0091] In exemplary embodiments, the fifth lens may have negative power.The fifth lens may have a biconcave type or a convexo-concave type.

[0092] In an exemplary embodiment, the sixth lens may have positive optical power. The sixth lens may have a convex-concave surface or a biconvex surface. Such optical power and surface configuration of the sixth lens is conducive to light convergence, and is conducive to reducing the diameter and length of the optical lens barrel, thereby achieving miniaturization.

[0093] In an exemplary embodiment, the seventh lens may have a negative optical power. The seventh lens may have a concave-convex surface type, a convex-concave surface type, or a biconcave surface type. Preferably, the seventh lens has an aspherical mirror surface. Such an optical power and surface type setting of the seventh lens is conducive to smoothing the front light trend and improving the resolution quality.

[0094] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / F≤2.5, wherein TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F may further satisfy: TTL / F≤2.2. Satisfying TTL / F≤2.5 can effectively limit the length of the lens, which is conducive to miniaturization of the lens.

[0095] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / H / FOV≤0.7, wherein TTL is the distance on the optical axis from the center of the object side surface of the first lens to the imaging surface of the optical lens, FOV is the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, TTL, H, and FOV may further satisfy: TTL / H / FOV≤0.55. Satisfying TTL / H / FOV≤0.7 can effectively limit the length of the lens without changing the imaging surface and image height of the lens, thereby achieving miniaturization of the lens.

[0096] In an exemplary embodiment, the optical lens according to the present application may satisfy: VD3+VD4≥110, wherein VD3 is the Abbe number of the third lens, and VD4 is the Abbe number of the fourth lens. More specifically, VD3 and VD4 may further satisfy: VD3+VD4≥120. Satisfying VD3+VD4≥110 helps correct chromatic aberration and improve resolution.

[0097] In an exemplary embodiment, the optical lens according to the present application may satisfy: 50≤VD3≤120, where VD3 is the Abbe number of the third lens. More specifically, VD3 may further satisfy: 60≤VD3≤100. Satisfying 50≤VD3≤120 helps correct chromatic aberration and improve resolution.

[0098] In an exemplary embodiment, the optical lens according to the present application may satisfy: 40≤VD4≤120, wherein VD4 is the Abbe number of the fourth lens. More specifically, VD4 may further satisfy: 45≤VD4≤100. Satisfying 40≤VD4≤120 helps correct chromatic aberration and improve resolution.

[0099] In an exemplary embodiment, the optical lens according to the present application may satisfy: (FOV×F) / H≥50°, where FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. More specifically, FOV, F, and H may further satisfy: (FOV×F) / H≥55°. Satisfying (FOV×F) / H≥50° is conducive to achieving high-angle resolution, while also being conducive to satisfying characteristics such as telephoto and large field of view.

[0100] In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL / TTL≥0.07, wherein BFL is the distance from the center of the image side surface of the seventh lens to the imaging surface of the optical lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, BFL and TTL may further satisfy: BFL / TTL≥0.075. Meeting BFL / TTL≥0.07 is beneficial for achieving a longer back focus on the basis of miniaturization, which is beneficial for module assembly, and is beneficial for making the length of the lens group shorter, making the lens group structure compact, reducing the sensitivity of the lens to MTF, improving production yield, and reducing production costs.

[0101] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤|F4 / F5|≤2, where F4 is the effective focal length of the fourth lens and F5 is the effective focal length of the fifth lens. More specifically, F4 and F5 may further satisfy: 1.4≤|F4 / F5|≤1.9. Satisfying 1≤|F4 / F5|≤2 helps to smoothly transition light and correct chromatic aberration.

[0102] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤|F3 / F|≤2, where 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 may further satisfy: 1≤|F3 / F|≤1.5. Satisfying 1≤|F3 / F|≤2 helps to better adjust chromatic aberration and improve resolution.

[0103] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤|F45 / F|≤10, where F45 is the effective focal length of the cemented lens formed by cementing the fourth lens and the fifth lens, and F is the total effective focal length of the optical lens. More specifically, F45 and F may further satisfy: 2≤|F45 / F|≤8. Satisfying 1≤|F45 / F|≤10 helps more light enter smoothly and improves illumination.

[0104] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤dn / dm≤2, wherein the fourth lens and the fifth lens are cemented to form a cemented lens, dn is the center thickness of the lens with the largest center thickness among the second lens, the third lens, and the cemented lens, and dm is the center thickness of the lens with the smallest center thickness among the second lens, the third lens, and the cemented lens. More specifically, dn and dm may further satisfy: 1.3≤dn / dm≤1.8. Satisfying 1≤dn / dm≤2 helps the overall light deflection change of the optical lens to be smaller at high and low temperatures, and the temperature performance is better.

[0105] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤|R6 / R7|≤2, wherein R6 is the radius of curvature of the object side surface of the third lens, and R7 is the radius of curvature of the image side surface of the third lens. More specifically, R6 and R7 may further satisfy: 0.8≤|R6 / R7|≤1.9. Satisfying 0.5≤|R6 / R7|≤2 can correct the aberration of the optical lens and reduce the tolerance sensitivity of the optical lens.

[0106] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.1≤|R1 / (R2+d1)|≤1, wherein R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and d1 is the center thickness of the first lens on the optical axis. More specifically, R1, R2 and d1 may further satisfy: 0.3≤|R1 / (R2+d1)|≤0.8. Satisfying 0.1≤|R1 / (R2+d1)|≤1 can make the peripheral light of the first lens have an optical path difference with the central light, which is beneficial to diverge the central light and enter the rear optical system, and is beneficial to reduce the diameter of the front port of the lens, reduce the volume, and facilitate miniaturization and cost reduction.

[0107] In an exemplary embodiment, the optical lens according to the present application may satisfy: F / ENPD≤2, where F is the total effective focal length of the optical lens, and ENPD is the entrance pupil diameter of the optical lens. More specifically, F and ENPD may further satisfy: F / ENPD≤1.8. Satisfying F / ENPD≤2 helps to improve relative illumination.

[0108] In an exemplary embodiment, the optical lens according to the present application may satisfy: arctan(SAG41 / D41)≤30, wherein D41 is the maximum clear semi-aperture of the object side of the fourth lens corresponding to the maximum field angle of the optical lens, and SAG41 is the distance on the optical axis from the intersection of the object side of the fourth lens and the optical axis to the maximum clear aperture of the object side of the fourth lens. More specifically, SAG41 and D41 may further satisfy: arctan(SAG41 / D41)≤24. Satisfying arctan(SAG41 / D41)≤30 helps to reduce ghost images.

[0109] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤R1 / F≤2, where F is the total effective focal length of the optical lens, and R1 is the radius of curvature of the object side of the first lens. More specifically, R1 and F may further satisfy: 0.9≤R1 / F≤1.5. Satisfying 0.5≤R1 / F≤2 is conducive to improving the relative illumination of the lens.

[0110] In an exemplary embodiment, the optical lens according to the present application may satisfy: (d4+d5) / TTL≤0.3, wherein d4 is the center thickness of the fourth lens on the optical axis, d5 is the center thickness of the fifth lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, d4, d5 and TTL may further satisfy: (d4+d5) / TTL≤0.2. Satisfying (d4+d5) / TTL≤0.3 is conducive to improving relative illumination.

[0111] In an exemplary embodiment, the optical lens according to the present application may satisfy: |(HF×θ) / (F×θ)|≤0.2, wherein θ is the maximum field angle of the optical lens in radians, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, H, F, and θ may further satisfy: |(HF×θ) / (F×θ)|≤0.18. By satisfying |(HF×θ) / (F×θ)|≤0.2, the imaging effect of the central area of ​​the lens imaging surface can be highlighted by increasing the focal length of the lens without changing the field angle of the lens and the size of the imaging surface.

[0112] In an exemplary embodiment, an aperture for limiting the light beam may be provided between the second lens and the third lens or between the first lens and the second lens to further improve the imaging quality of the optical lens. Setting the aperture between the second lens and the third lens or between the first lens and the second lens is conducive to effectively converging the light entering the optical lens and reducing the lens aperture. In an embodiment of the present application, the aperture may be provided near the image side surface of the first lens, or near the object side surface of the second lens, or near the image side surface of the second lens, or near the object side surface of the third lens. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be provided at other positions according to actual needs.

[0113] In an exemplary embodiment, as needed, the optical lens according to the present application may further include a filter and / or a protective glass disposed between the seventh lens and the imaging plane to filter light with different wavelengths and prevent damage to the image-side element (e.g., chip) of the optical lens.

[0114] As known to those skilled in the art, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in optical lenses can improve image quality and 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 process during the lens manufacturing process.

[0115] In an exemplary embodiment, the fourth lens and the fifth lens may be cemented to form a cemented lens. The fourth lens having positive power and convex surfaces on the object side and the image side is cemented with the fifth lens having negative power and concave surfaces on the object side and the image side, or the fourth lens having positive power and convex surface on the object side and concave surface on the image side is cemented with the fifth lens having negative power and convex surface on the object side and concave surface on the image side, which is conducive to smoothly transitioning the light passing through the fourth lens to the imaging surface, is conducive to reducing the total length of the lens, is conducive to correcting various aberrations of the optical lens, and realizes the improvement of system resolution, optimization of distortion and CRA and other optical performances under the premise of compact optical lens structure.

[0116] The above-mentioned gluing method between lenses has at least one of the following advantages: reducing the self-chromatic aberration, reducing the tolerance sensitivity, and balancing the overall chromatic aberration of the system through the residual partial chromatic aberration; reducing the spacing between the two lenses, thereby reducing the total length of the system; reducing the assembly components between the lenses, thereby reducing the process and reducing costs; reducing the tolerance sensitivity problems such as tilt / eccentricity caused by the lens unit during the assembly process, and improving the production yield; reducing the light loss caused by reflection between lenses, and improving the illumination; further reducing the field curvature, and effectively correcting the off-axis point aberration of the optical lens. Such a gluing design shares the overall chromatic aberration correction of the system, effectively corrects the aberration to improve the resolution, and makes the overall optical system compact to meet the requirements of miniaturization.

[0117] In an exemplary embodiment, the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens may be spherical lenses; the second lens and the seventh lens may be aspherical lenses. In particular, in order to improve the resolution quality of the optical system, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may all be aspherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. The setting of an aspherical lens helps to correct system aberrations and improve resolution.

[0118] According to the optical lens of the above-mentioned embodiment of the present application, by reasonably setting the shape and focal power of each lens, the optical system can achieve at least one beneficial effect of small chromatic aberration, high resolution (up to more than 8 million pixels), miniaturization, small front port diameter, long back focus and good imaging quality when only 7 lenses are used. At the same time, the optical system also takes into account the low-cost requirements of small lens volume, low sensitivity and high production yield. The optical lens also has a small CRA, which can not only avoid stray light generated by hitting the lens barrel when the rear end of the light is emitted, but also can be well matched with the on-board chip, so that the optical lens will not produce color cast and dark corners. At the same time, the optical lens has good temperature adaptability, small changes in imaging effects under high and low temperature environments, and stable image quality, which is conducive to the use of the optical lens in most environments.

[0119] According to the optical lens of the above-mentioned embodiment of the present application, a cemented lens is provided to share the overall chromatic aberration correction of the system, which is beneficial for correcting the system aberration, improving the system resolution quality, reducing the coordination sensitivity problem, and making the overall structure of the optical system compact to meet the miniaturization requirements.

[0120] In an exemplary embodiment, the first to seventh lenses in the optical lens may all be made of glass. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve system stability. At the same time, the use of glass material can avoid lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the lens. Specifically, when focusing on resolution quality and reliability, the first to seventh lenses may all be glass aspherical lenses. Of course, in applications with lower temperature stability requirements, the first to seventh lenses in the optical lens may also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first to seventh lenses in the optical lens may also be made of a combination of plastic and glass.

[0121] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiment, the optical lens is not limited to including seven lenses. If necessary, the optical lens may also include other numbers of lenses.

[0122] Specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0123] Example 1

[0124] The following reference Figure 1 An optical lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0125] like Figure 1 As 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 object side to the image side along the optical axis.

[0126] The first lens L1 is a biconcave lens with negative focal power, whose object side surface S1 is concave, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with positive focal power, whose object side surface S3 is convex, and whose image side surface S4 is concave. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S6 is convex, and whose image side surface S7 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative focal power, whose object side surface S9 is concave, and whose image side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is concave. The seventh lens L7 is a biconcave lens with negative focal power, whose object side surface S13 is concave, and whose image side surface S14 is concave. The fourth lens L4 and the fifth lens L5 may be cemented to form a cemented lens.

[0127] 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 imaging quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

[0128] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface.

[0129] Table 1 shows the radius of curvature R, thickness / distance d (it should be understood that the thickness / distance d of the row where S1 is located is the center thickness d1 of the first lens L1, the thickness / distance d of the row where S2 is located is the spacing distance d12 between the first lens L1 and the second lens L2, and so on), refractive index ND, and Abbe number VD of each lens of the optical lens of Example 1.

[0130]

[0131] Table 1

[0132] In Embodiment 1, the second lens L2 and the seventh lens L7 may be aspherical lenses, and the first lens L1, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 may be spherical lenses. The surface shape x of each aspherical lens may be defined by, but not limited to, the following aspherical formula:

[0133]

[0134] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspheric mirror surface S3, S4, S13 and S14 in Example 1.

[0135] Face number k A4 A6 A8 A10 A12 A14 A16 S3 / -3.7105E-05 1.6207E-07 -2.3982E-08 8.6145E-10 -1.5626E-11 1.1394E-13 / S4 / 4.7170E-05 6.5744E-08 -3.7075E-09 1.4165E-10 -3.2150E-12 3.1006E-14 / S13 99.0000 -1.5203E-03 -3.4714E-05 7.4417E-06 -1.0749E-06 8.8882E-08 -3.7695E-09 6.5359E-11 S14 -62.8703 -1.1346E-03 -5.0952E-05 9.6905E-06 -1.0188E-06 6.2823E-08 -2.0529E-09 2.7405E-11

[0136] Table 2

[0137] Example 2

[0138] The following reference Figure 2 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present application is shown.

[0139] like Figure 2 As 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 object side to the image side along the optical axis.

[0140] The first lens L1 is a biconcave lens with negative focal power, whose object side surface S1 is concave, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with positive focal power, whose object side surface S3 is convex, and whose image side surface S4 is concave. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S6 is convex, and whose image side surface S7 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is concave. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S9 is convex, and whose image side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is concave. The seventh lens L7 is a biconcave lens with negative focal power, whose object side surface S13 is concave, and whose image side surface S14 is concave. The fourth lens L4 and the fifth lens L5 may be cemented to form a cemented lens.

[0141] 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 imaging quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

[0142] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface.

[0143] Table 3 shows the radius of curvature R, thickness / distance d, 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 coefficient of each aspheric mirror surface that can be used in Example 2, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0144]

[0145]

[0146] Table 3

[0147] Face number k A4 A6 A8 A10 A12 A14 A16 S3 / -2.0471E-05 7.5344E-07 -5.0240E-08 1.7146E-09 -2.8399E-11 1.6874E-13 / S4 / 6.7666E-05 5.0176E-07 -1.6310E-08 4.3557E-10 -2.1257E-12 -5.0188E-14 / S13 99.0000 -2.0570E-03 -2.5626E-05 6.8082E-06 -1.0087E-06 8.2449E-08 -3.3965E-09 5.5732E-11 S14 -62.8703 -1.3845E-03 -4.5932E-05 9.6159E-06 -1.0199E-06 6.3437E-08 -2.0854E-09 2.7892E-11

[0148] Table 4

[0149] Example 3

[0150] The following reference Figure 3 An optical lens according to Example 3 of the present application is described. Figure 3 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0151] like Figure 3 As 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 object side to the image side along the optical axis.

[0152] The first lens L1 is a biconcave lens with negative focal power, whose object side surface S1 is concave, and whose image side surface S2 is concave. The second lens L2 is a biconvex lens with positive focal power, whose object side surface S3 is convex, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S6 is convex, and whose image side surface S7 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is concave. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S9 is convex, and whose image side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is concave. The seventh lens L7 is a biconcave lens with negative focal power, whose object side surface S13 is concave, and whose image side surface S14 is concave. The fourth lens L4 and the fifth lens L5 may be cemented to form a cemented lens.

[0153] 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 imaging quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

[0154] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface.

[0155] Table 5 shows the radius of curvature R, thickness / distance d, 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 coefficient of each aspheric mirror surface that can be used in Example 3, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0156]

[0157] Table 5

[0158] Face number k A4 A6 A8 A10 A12 A14 A16 S3 / -3.8271E-05 5.9776E-07 -3.4406E-08 8.7411E-10 -5.8120E-12 -4.3626E-14 / S4 / 4.1503E-05 2.7181E-07 1.4009E-08 -1.1311E-09 3.6539E-11 -3.9143E-13 / S13 99.0000 -2.0074E-03 -2.9249E-05 6.1365E-06 -8.2939E-07 6.4084E-08 -2.5213E-09 3.9531E-11 S14 -62.8703 -1.2996E-03 -5.0610E-05 9.4551E-06 -9.5569E-07 5.7514E-08 -1.8419E-09 2.4052E-11

[0159] Table 6

[0160] Example 4

[0161] The following reference Figure 4 An optical lens according to Example 4 of the present application is described. Figure 4 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0162] like Figure 4 As 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 object side to the image side along the optical axis.

[0163] The first lens L1 is a biconcave lens with negative focal power, whose object side surface S1 is concave, and whose image side surface S2 is concave. The second lens L2 is a biconvex lens with positive focal power, whose object side surface S3 is convex, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S6 is convex, and whose image side surface S7 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative focal power, whose object side surface S9 is concave, and whose image side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is concave. The seventh lens L7 is a convex-concave lens with negative focal power, whose object side surface S13 is convex, and whose image side surface S14 is concave. The fourth lens L4 and the fifth lens L5 may be cemented to form a cemented lens.

[0164] 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 imaging quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

[0165] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface.

[0166] Table 7 shows the radius of curvature R, thickness / distance d, 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 coefficient of each aspheric mirror surface that can be used in Example 4, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0167]

[0168] Table 7

[0169] Face number k A4 A6 A8 A10 A12 A14 A16 S3 / -4.9659E-05 6.1691E-07 -4.0306E-08 1.2912E-09 -1.8951E-11 1.0017E-13 / S4 / 2.3164E-05 3.3249E-07 -6.3657E-09 -2.4718E-11 7.1529E-12 -1.0220E-13 / S13 99.0000 -2.0017E-03 -3.2448E-05 6.4981E-06 -8.5155E-07 5.9474E-08 -2.1615E-09 3.0716E-11 S14 -62.8703 -1.1026E-03 -7.2596E-05 1.0862E-05 -1.0210E-06 5.8817E-08 -1.8065E-09 2.2476E-11

[0170] Table 8

[0171] Example 5

[0172] The following reference Figure 5 An optical lens according to Example 5 of the present application is described. Figure 5 A schematic structural diagram of an optical lens according to Example 5 of the present application is shown.

[0173] like Figure 5As 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 object side to the image side along the optical axis.

[0174] The first lens L1 is a biconcave lens with negative focal power, whose object side surface S1 is concave, and whose image side surface S2 is concave. The second lens L2 is a biconvex lens with positive focal power, whose object side surface S3 is convex, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S6 is convex, and whose image side surface S7 is convex. The fourth lens L4 is a convex-concave lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is concave. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S9 is convex, and whose image side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is concave. The seventh lens L7 is a biconcave lens with negative focal power, whose object side surface S13 is concave, and whose image side surface S14 is concave. The fourth lens L4 and the fifth lens L5 may be cemented to form a cemented lens.

[0175] 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 imaging quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

[0176] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface.

[0177] Table 9 shows the radius of curvature R, thickness / distance d, refractive index ND and Abbe number VD of each lens of the optical lens of Example 5. Table 10 shows the cone coefficient and high-order coefficient that can be used for each aspherical mirror surface in Example 5, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0178]

[0179]

[0180] Table 9

[0181] Face number k A4 A6 A8 A10 A12 A14 A16 S3 / -3.7510E-05 5.9171E-07 -4.6538E-08 1.0496E-09 -1.2080E-11 2.7220E-14 / S4 / 4.2985E-05 3.4428E-07 2.6962E-09 -5.5635E-10 2.0465E-11 -2.3853E-13 / S13 100.0000 -1.9210E-03 -2.6859E-05 5.6963E-06 -8.0102E-07 6.2995E-08 -2.5115E-09 3.9842E-11 S14 -62.8703 -1.2608E-03 -4.8323E-05 8.9504E-06 -9.1359E-07 5.5212E-08 -1.7712E-09 2.3152E-11

[0182] Table 10

[0183] Example 6

[0184] The following reference Figure 6 An optical lens according to Example 6 of the present application is described. Figure 6 A schematic structural diagram of an optical lens according to Example 6 of the present application is shown.

[0185] like Figure 6 As 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 object side to the image side along the optical axis.

[0186] The first lens L1 is a biconcave lens with negative focal power, whose object side surface S1 is concave, and whose image side surface S2 is concave. The second lens L2 is a biconvex lens with positive focal power, whose object side surface S3 is convex, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S6 is convex, and whose image side surface S7 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative focal power, whose object side surface S9 is concave, and whose image side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is concave. The seventh lens L7 is a meniscus lens with negative focal power, whose object side surface S13 is concave, and whose image side surface S14 is convex. The fourth lens L4 and the fifth lens L5 may be cemented to form a cemented lens.

[0187] 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 imaging quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

[0188] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface.

[0189] Table 11 shows the radius of curvature R, thickness / distance d, refractive index ND and Abbe number VD of each lens of the optical lens of Example 6. Table 12 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 6, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0190]

[0191]

[0192] Table 11

[0193] Face number k A4 A6 A8 A10 A12 A14 A16 S3 / -5.1020E-05 7.5329E-07 -4.2666E-08 1.5382E-09 -2.4485E-11 1.4318E-13 / S4 / 3.5745E-05 4.1950E-07 3.4460E-09 -3.6341E-10 1.5691E-11 -1.9184E-13 / S13 99.0000 -7.1476E-04 -5.5994E-05 1.2995E-05 -1.9445E-06 1.6857E-07 -7.5975E-09 1.3956E-10 S14 -62.8703 -3.7632E-04 -1.2259E-04 2.0800E-05 -2.2269E-06 1.3943E-07 -4.6330E-09 6.1740E-11

[0194] Table 12

[0195] Example 7

[0196] The following reference Figure 7 An optical lens according to Example 7 of the present application is described. Figure 7 A schematic structural diagram of an optical lens according to Example 7 of the present application is shown.

[0197] like Figure 7 As 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 object side to the image side along the optical axis.

[0198] The first lens L1 is a biconcave lens with negative power, whose object side surface S1 is concave, and whose image side surface S2 is concave. The second lens L2 is a biconvex lens with positive power, whose object side surface S4 is convex, and whose image side surface S5 is convex. The third lens L3 is a biconvex lens with positive power, whose object side surface S6 is convex, and whose image side surface S7 is convex. The fourth lens L4 is a biconvex lens with positive power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative power, whose object side surface S9 is concave, and whose image side surface S10 is concave. The sixth lens L6 is a biconvex lens with positive power, whose object side surface S11 is convex, and whose image side surface S12 is convex. The seventh lens L7 is a biconcave lens with negative power, whose object side surface S13 is concave, and whose image side surface S14 is concave. The fourth lens L4 and the fifth lens L5 may be cemented to form a cemented lens.

[0199] 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 imaging quality. For example, the stop STO may be disposed between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

[0200] Optionally, the optical lens may further include a filter L8 and / or a protective glass L8' having an object side surface S15 and an image side surface S16, wherein the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensor chip IMA located at the imaging surface. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface.

[0201] Table 13 shows the radius of curvature R, thickness / distance d, 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 coefficient of each aspheric mirror surface that can be used in Example 7, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0202]

[0203] Table 13

[0204] Face number k A4 A6 A8 A10 A12 A14 A16 S4 -0.0825 -1.8105E-04 -8.2560E-07 -1.2030E-07 4.1156E-09 -9.1497E-11 7.4049E-13 / S5 -0.0170 -2.9465E-05 -2.2046E-07 -8.1492E-08 2.7871E-09 -5.3169E-11 4.3644E-13 / S13 99.0000 -1.2704E-03 -2.6943E-05 7.5046E-06 -8.5132E-07 5.5618E-08 -1.9359E-09 3.0544E-11 S14 -70.0000 2.6044E-04 -1.9687E-04 2.3243E-05 -1.8904E-06 9.5294E-08 -2.7333E-09 3.5524E-11

[0205] Table 14

[0206] In summary, Examples 1 to 7 respectively satisfy the relationship shown in Table 15. In Table 15, the units of TTL, F, H, ENPD, F3, F4, F5, F45, R1, R2, R6, R7, d1, d4, d5, dn, dm, D41, SAG41, and BFL are millimeters (mm), and the unit of FOV is degrees (°).

[0207]

[0208]

[0209] Table 15

[0210] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment 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 an independent electronic device such as a detection distance camera, or an imaging module integrated in a device such as a detection distance device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated in a driving assistance system such as a vehicle-mounted camera.

[0211] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical lens, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has a negative optical power, and its object side surface is concave and its image side surface is concave; a second lens having positive refractive power and a convex object-side surface; The third lens has positive power, and its object side surface is convex and its image side surface is convex; a fourth lens element having positive refractive power and a convex object-side surface; a fifth lens element having negative optical power, whose image side surface is concave; a sixth lens element having positive refractive power and having a convex object-side surface; and a seventh lens having negative optical power; The number of lenses with optical power in the optical lens is seven; The distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens satisfy: TTL / F≤2.5; and The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 1≤|F3 / F|≤2.

2. The optical lens according to claim 1, characterized in that: The image-side surface of the second lens is a concave surface.

3. The optical lens according to claim 1, characterized in that: The image-side surface of the second lens is a convex surface.

4. The optical lens according to claim 1, characterized in that: The image side surface of the fourth lens is a concave surface.

5. The optical lens according to claim 1, characterized in that: The image side surface of the fourth lens is a convex surface.

6. The optical lens according to claim 1, characterized in that: The object side surface of the fifth lens is a convex surface.

7. The optical lens according to claim 1, characterized in that: The object side surface of the fifth lens is a concave surface.

8. The optical lens according to claim 1, characterized in that: The image side surface of the sixth lens is a concave surface.

9. The optical lens according to claim 1, characterized in that: The image side surface of the sixth lens is a convex surface.

10. The optical lens according to claim 1, characterized in that: The object side surface of the seventh lens is concave, and the image side surface is convex.

11. The optical lens according to claim 1, characterized in that: The object side surface of the seventh lens is concave or convex, and the image side surface is concave.

12. The optical lens according to claim 1, characterized in that: The fourth lens and the fifth lens are cemented to form a cemented lens.

13. The optical lens according to claim 1, characterized in that: The second lens and the seventh lens have aspherical mirror surfaces.

14. The optical lens according to claim 1, characterized in that: The optical lens further includes a stop disposed between the second lens and the third lens.

15. The optical lens according to claim 1, characterized in that: The optical lens further includes a stop disposed between the first lens and the second lens.

16. The optical lens according to any one of claims 1 to 15, characterized in that: The distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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 satisfy: TTL / H / FOV×180°≤126.

17. The optical lens according to any one of claims 1 to 15, characterized in that: The Abbe number VD3 of the third lens and the Abbe number VD4 of the fourth lens satisfy: VD3+VD4≥110.

18. The optical lens according to any one of claims 1 to 15, characterized in that: 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 satisfy: (FOV×F) / H≥50°.

19. The optical lens according to any one of claims 1 to 15, characterized in that: A distance BFL from the center of the image side surface of the seventh lens to the imaging surface of the optical lens on the optical axis and a distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: BFL / TTL≥0.

07.

20. The optical lens according to any one of claims 1 to 15, characterized in that: An effective focal length F4 of the fourth lens and an effective focal length F5 of the fifth lens satisfy: 1≤|F4 / F5|≤2.

21. The optical lens according to any one of claims 1 to 15, characterized in that: An effective focal length F45 of a cemented lens formed by cementing the fourth lens and the fifth lens and a total effective focal length F of the optical lens satisfy the following: 1≤|F45 / F|≤10.

22. The optical lens according to any one of claims 1 to 15, characterized in that: The fourth lens and the fifth lens are cemented to form a cemented lens, and the optical lens satisfies: 1≤dn / dm≤2, wherein, dn is the center thickness of the lens having the largest center thickness among the second lens, the third lens, and the cemented lens; and dm is the center thickness of the lens having the smallest center thickness among the second lens, the third lens, and the cemented lens.

23. The optical lens according to any one of claims 1 to 15, characterized in that: A curvature radius R6 of the object-side surface of the third lens and a curvature radius R7 of the image-side surface of the third lens satisfy: 0.5≤|R6 / R7|≤2.

24. The optical lens according to any one of claims 1 to 15, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy: 0.1≤|R1 / (R2+d1)|≤1.

25. The optical lens according to any one of claims 1 to 15, characterized in that: The total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤2.

26. The optical lens according to any one of claims 1 to 15, characterized in that: The maximum clear semi-aperture D41 of the object side of the fourth lens corresponding to the maximum field angle of the optical lens and the distance SAG41 on the optical axis from the intersection of the object side of the fourth lens and the optical axis to the maximum clear aperture of the object side of the fourth lens satisfy: arctan(SAG41 / D41)≤30°.

27. The optical lens according to any one of claims 1 to 15, characterized in that: The total effective focal length F of the optical lens and the curvature radius R1 of the object side surface of the first lens satisfy: 0.5≤R1 / F≤2.

28. The optical lens according to any one of claims 1 to 15, characterized in that: The center thickness d4 of the fourth lens on the optical axis, the center thickness d5 of the fifth lens on the optical axis, and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: (d4+d5) / TTL≤0.

3.

29. The optical lens according to any one of claims 1 to 15, characterized in that: The maximum field angle θ of the optical lens in radians, 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: |(HF×θ) / (F×θ)|≤0.

2.

30. The optical lens according to claim 22, characterized in that: An effective focal length F45 of a cemented lens formed by cementing the fourth lens and the fifth lens and a total effective focal length F of the optical lens satisfy the following: 3.73≤|F45 / F|≤10.

31. The optical lens according to claim 24, characterized in that: A curvature radius R6 of the object-side surface of the third lens and a curvature radius R7 of the image-side surface of the third lens satisfy: 0.8≤|R6 / R7|≤2.

32. The optical lens according to claim 25, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy: 0.3≤|R1 / (R2+d1)|≤1.

33. The optical lens according to claim 29, characterized in that: The center thickness d4 of the fourth lens on the optical axis, the center thickness d5 of the fifth lens on the optical axis, and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: (d4+d5) / TTL≤0.

15.

34. An optical lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens having negative optical power; a second lens having positive optical power; The third lens has positive power, and its object side surface is convex and its image side surface is convex; a fourth lens having positive refractive power; a fifth lens having negative optical power; a sixth lens having positive refractive power; and a seventh lens having negative optical power; A distance BFL from the center of the image side surface of the seventh lens to the imaging surface of the optical lens on the optical axis and a distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: BFL / TTL≥0.07; The number of lenses with optical power in the optical lens is seven; The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 1≤|F3 / F|≤2.

35. The optical lens according to claim 34, characterized in that: The object side surface of the first lens is a concave surface, and the image side surface is a concave surface.

36. The optical lens according to claim 34, characterized in that: The object side surface of the second lens is convex, and the image side surface is concave.

37. The optical lens according to claim 34, characterized in that: The object side surface of the second lens is convex, and the image side surface is convex.

38. The optical lens according to claim 34, characterized in that: The object side surface of the fourth lens is convex, and the image side surface is concave.

39. The optical lens according to claim 34, characterized in that: The object side surface of the fourth lens is convex, and the image side surface is convex.

40. The optical lens according to claim 34, characterized in that: The object side surface of the fifth lens is convex, and the image side surface is concave.

41. The optical lens according to claim 34, characterized in that: The object side surface of the fifth lens is concave, and the image side surface is concave.

42. The optical lens according to claim 34, characterized in that: The object side surface of the sixth lens is convex, and the image side surface is concave.

43. The optical lens according to claim 34, characterized in that: The object-side surface of the sixth lens is convex, and the image-side surface is convex.

44. The optical lens according to claim 34, characterized in that: The object side surface of the seventh lens is concave, and the image side surface is convex.

45. The optical lens according to claim 34, characterized in that: The object side surface of the seventh lens is concave or convex, and the image side surface is concave.

46. ​​The optical lens according to claim 34, characterized in that: The fourth lens and the fifth lens are cemented to form a cemented lens.

47. The optical lens according to claim 34, characterized in that: The second lens and the seventh lens have aspherical mirror surfaces.

48. The optical lens according to claim 34, characterized in that: The optical lens further includes a stop disposed between the second lens and the third lens.

49. The optical lens according to claim 34, characterized in that: The optical lens further includes a stop disposed between the first lens and the second lens.

50. The optical lens according to any one of claims 34-49, characterized in that: A distance TTL from the center of the object-side surface of the first lens to the imaging surface of the optical lens on the optical axis and a total effective focal length F of the optical lens satisfy: TTL / F≤2.

5.

51. The optical lens according to any one of claims 34-49, characterized in that: The distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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 satisfy: TTL / H / FOV×180°≤126.

52. The optical lens according to any one of claims 34-49, characterized in that: The Abbe number VD3 of the third lens and the Abbe number VD4 of the fourth lens satisfy: VD3+VD4≥110.

53. The optical lens according to any one of claims 34-49, characterized in that: 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 satisfy: (FOV×F) / H≥50°.

54. The optical lens according to any one of claims 34-49, characterized in that: The total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤2.

55. The optical lens according to any one of claims 34-49, characterized in that: An effective focal length F4 of the fourth lens and an effective focal length F5 of the fifth lens satisfy: 1≤|F4 / F5|≤2.

56. The optical lens according to any one of claims 34-49, characterized in that: An effective focal length F45 of a cemented lens formed by cementing the fourth lens and the fifth lens and a total effective focal length F of the optical lens satisfy the following: 1≤|F45 / F|≤10.

57. The optical lens according to any one of claims 34-49, characterized in that: The fourth lens and the fifth lens are cemented to form a cemented lens, and the optical lens satisfies: 1≤dn / dm≤2, wherein, dn is the center thickness of the lens having the largest center thickness among the second lens, the third lens, and the cemented lens; and dm is the center thickness of the lens having the smallest center thickness among the second lens, the third lens, and the cemented lens.

58. The optical lens according to any one of claims 34-49, characterized in that: A curvature radius R6 of the object-side surface of the third lens and a curvature radius R7 of the image-side surface of the third lens satisfy: 0.5≤|R6 / R7|≤2.

59. The optical lens according to any one of claims 34-49, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy: 0.1≤|R1 / (R2+d1)|≤1.

60. The optical lens according to any one of claims 34-49, characterized in that: The maximum clear semi-aperture D41 of the object side of the fourth lens corresponding to the maximum field angle of the optical lens and the distance SAG41 on the optical axis from the intersection of the object side of the fourth lens and the optical axis to the maximum clear aperture of the object side of the fourth lens satisfy: arctan(SAG41 / D41)≤30°.

61. The optical lens according to any one of claims 34-49, characterized in that: The total effective focal length F of the optical lens and the curvature radius R1 of the object side surface of the first lens satisfy: 0.5≤R1 / F≤2.

62. The optical lens according to any one of claims 34-49, characterized in that: The center thickness d4 of the fourth lens on the optical axis, the center thickness d5 of the fifth lens on the optical axis, and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: (d4+d5) / TTL≤0.

3.

63. The optical lens according to any one of claims 34-49, characterized in that: The maximum field angle θ of the optical lens in radians, 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: |(HF×θ) / (F×θ)|≤0.

2.

64. The optical lens according to claim 56, characterized in that: An effective focal length F45 of a cemented lens formed by cementing the fourth lens and the fifth lens and a total effective focal length F of the optical lens satisfy the following: 3.73≤|F45 / F|≤10.

65. The optical lens according to claim 58, characterized in that: A curvature radius R6 of the object-side surface of the third lens and a curvature radius R7 of the image-side surface of the third lens satisfy: 0.8≤|R6 / R7|≤2.

66. The optical lens according to claim 59, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy: 0.3≤|R1 / (R2+d1)|≤1.

67. The optical lens according to claim 62, characterized in that: The center thickness d4 of the fourth lens on the optical axis, the center thickness d5 of the fifth lens on the optical axis, and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: (d4+d5) / TTL≤0.

15.

68. An electronic device, characterized in that: It comprises an optical lens according to any one of claims 1-67 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images