Optical lenses and electronic equipment

Abstract

The present application discloses an optical lens and an electronic device, which include a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power and a sixth lens with positive optical power in sequence from the first side to the second side along the optical axis. The first side surfaces of the first lens and the second lens are convex, and the second side surfaces are concave. The first side surface of the third lens is convex. The second side surface of the fourth lens is convex. The first side surface of the fifth lens is concave, and the second side surface is convex. The first side surface of the sixth lens is convex, and the second side surface is convex. The optical lens satisfies: ‑11.7≤R9 / F≤‑1 and 14≤(F4+F5) / F≤58, wherein R9 is the radius of curvature of the first side surface of the fifth lens, F is the total effective focal length of the optical lens, F4 is the effective focal length of the fourth lens, and F5 is the effective focal length of the fifth lens.

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] With the continuous development of science and technology, optical lenses are widely used in the fields of intelligent automobile industry, and higher requirements are put forward for optical lenses. For example, optical lenses are developing in the direction of high imaging quality, miniaturization and high illumination. However, in order to achieve the miniaturization of optical lenses, optical lenses are usually prone to ghost images and have low relative illumination, which affects the imaging quality of optical lenses. Summary of the invention

[0003] The first aspect of the present application provides an optical lens, which includes a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power in order from the first side to the second side along the optical axis. The first side of the first lens is convex, and the second side is concave. The first side of the second lens is convex, and the second side is concave. The first side of the third lens is convex. The second side of the fourth lens is convex. The first side of the fifth lens is concave, and the second side is convex. The first side of the sixth lens is convex, and the second side is convex. The number of lenses with optical power in the optical lens is six. The optical lens satisfies: -11.7≤R9 / F≤-1, 14≤(F4+F5) / F≤58, wherein R9 is the radius of curvature of the first side of the fifth lens, F is the total effective focal length of the optical lens, F4 is the effective focal length of the fourth lens, and F5 is the effective focal length of the fifth lens.

[0004] According to an exemplary embodiment of the present application, the second side surface of the third lens is a convex surface or a concave surface; and the first side surface of the fourth lens is a plane or a convex surface or a concave surface.

[0005] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional formulas: 1.6≤F / ENPD≤1.8; 0<TTL / H / FOV×1°≤0.04; 0.1≤F / H≤0.4; 0.166≤BFL / TTL≤0.3; 0.0065≤D / H / FOV×1°≤0.05; 0.86mm -1 ≤D / H / F≤1.5mm -1; Wherein, F is the total effective focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, BFL is the back focal length of the optical lens, and D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field of view of the optical lens.

[0006] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional formulas: 5.9≤R1 / F≤6.6; 2.5≤R1 / R2≤3; 1.77≤Nd1≤1.95; wherein R1 is the radius of curvature of the first side surface of the first lens, F is the total effective focal length of the optical lens, R2 is the radius of curvature of the second side surface of the first lens, and Nd1 is the refractive index of the first lens.

[0007] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional formulas: -3≤F2 / F≤-2; 0.8≤R4 / d4≤1.62; 6.7≤sag4×(2×R4-sag4)≤10.5; wherein F2 is the effective focal length of the second lens, F is the total effective focal length of the optical lens, R4 is the radius of curvature of the second side surface of the second lens, d4 is the axial distance from the second side surface of the second lens to the first side surface of the third lens, and sag4 is the sag height of the second side surface of the second lens.

[0008] According to an exemplary embodiment of the present application, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 1.6≤F3 / F≤15.

[0009] According to an exemplary embodiment of the present application, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: 1.4≤F4 / F≤9.2.

[0010] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional formulas: 12.9≤F5 / F≤51; 0.8≤R9 / R10≤1.4; -0.27≤R9 / F5≤-0.01; -0.27≤R10 / F5≤-0.03; 0.001≤d8 / TTL≤0.04; 0.001≤d10 / TTL≤0.08; 0.69≤(R10-d9) / R9≤1.6; wherein F5 is the effective focal length of the fifth lens, F is the total effective focal length of the optical lens, R9 is the radius of curvature of the first side surface of the fifth lens, R10 is the radius of curvature of the second side surface of the fifth lens, d8 is the on-axis distance from the second side surface of the fourth lens to the first side surface of the fifth lens, TTL is the total optical length of the optical lens, d10 is the on-axis distance from the second side surface of the fifth lens to the first side surface of the sixth lens, and d9 is the center thickness of the fifth lens on the optical axis.

[0011] According to an exemplary embodiment of the present application, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: 3.5≤F6 / F≤5.0.

[0012] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional formulas: 0.4≤R4 / R2≤0.8; 0.4mm -1 ≤F1 / F2 / d2≤1mm -1 ; Wherein, R4 is the radius of curvature of the second side surface of the second lens, R2 is the radius of curvature of the second side surface of the first lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, and d2 is the axial distance from the second side surface of the first lens to the first side surface of the second lens.

[0013] According to an exemplary embodiment of the present application, the effective focal length F5 of the fifth lens and the effective focal length F2 of the second lens satisfy: -23≤F5 / F2≤-4.

[0014] According to an exemplary embodiment of the present application, a curvature radius R5 of the first side surface of the third lens and a curvature radius R8 of the second side surface of the fourth lens satisfy: -2.5≤R5 / R8≤-0.5.

[0015] According to an exemplary embodiment of the present application, an axial distance TH9 from the first side surface of the fifth lens to the imaging surface or image source surface of the second side of the optical lens and a total effective focal length F of the optical lens satisfy: 4≤TH9 / F≤6.

[0016] According to an exemplary embodiment of the present application, a curvature radius R12 of the second side surface of the sixth lens and a curvature radius R11 of the first side surface of the sixth lens satisfy: -5.9≤R12 / R11≤-2.4.

[0017] According to an exemplary embodiment of the present application, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: -5.2≤F1 / F≤-3.8.

[0018] According to an exemplary embodiment of the present application, the maximum field of view FOV of the optical lens and the total effective focal length F of the optical lens satisfy: 84° / mm≤FOV / F≤90° / mm.

[0019] According to an exemplary embodiment of the present application, a radius of curvature R9 of the first side surface of the fifth lens and an effective focal length F4 of the fourth lens satisfy: -2.83≤R9 / F4≤-0.2.

[0020] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional expressions:

[0021] 1.8≤Nd1≤1.92;1.6≤F / ENPD≤1.7;0.01≤TTL / H / FOV×1°≤0.02;-9.2≤R9 / F≤-2.8;4.8≤TH9 / F≤5.4;23≤(F4+F5) / F≤50;-5.2≤R12 / R11≤-3;0.8≤(R10-d9) / R9≤1.5;-2.6≤F2 / F≤-2.1;0.5≤R4 / R2≤0.6;6≤R1 / F≤6.5;-20≤F5 / F2≤-8;0.5mm -1 ≤F1 / F2 / d2≤0.8mm -1 ;-2.2≤R5 / R8≤-0.9;0.2≤F / H≤0.3;-5≤F1 / F≤-4;1≤R4 / d4≤1.5;2.6≤R1 / R2≤2.9;0.18≤BFL / TTL≤0.22;0.01≤D / H / FOV×1°≤0.02;0.9mm -1 ≤D / H / F≤1.0mm -1 ;86° / mm≤FOV / F≤88° / mm;4.4≤F3 / F≤12.6;3≤F4 / F≤7.6;20≤F5 / F≤43;3.8≤F6 / F≤4.8;0.9≤R9 / R10≤1.3;-0.23≤R9 / F5≤-0.06;-0.17≤R10 / F5≤-0.08;0.005≤d8 / TTL≤0.03;0.005≤d10 / TTL≤0.05;-2.2≤R9 / F4≤-0.4;7.5≤sag4×(2×R4-sag4)≤9.7;

[0022] Wherein, Nd1 is the refractive index of the first lens, F is the total effective focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, R9 is the radius of curvature of the first side surface of the fifth lens, TH9 is the axial distance from the first side surface of the fifth lens to the imaging surface or the image source surface of the second side of the optical lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, R12 is the radius of curvature of the second side surface of the sixth lens, R11 is the radius of curvature of the first side surface of the sixth lens, R10 is the radius of curvature of the second side surface of the fifth lens, d9 is the center thickness of the fifth lens on the optical axis, F2 is the effective focal length of the second lens, R4 is the radius of curvature of the second side surface of the second lens, R2 is the radius of curvature of the first lens R1 is the radius of curvature of the first side of the first lens, F1 is the effective focal length of the first lens, d2 is the axial distance from the second side of the first lens to the first side of the second lens, R5 is the radius of curvature of the first side of the third lens, R8 is the radius of curvature of the second side of the fourth lens, d4 is the axial distance from the second side of the second lens to the first side of the third lens, BFL is the back focal length of the optical lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, F3 is the effective focal length of the third lens, F6 is the effective focal length of the sixth lens, d8 is the axial distance from the second side of the fourth lens to the first side of the fifth lens, d10 is the axial distance from the second side of the fifth lens to the first side of the sixth lens, and sag4 is the sag height of the second side of the second lens.

[0023] The second aspect of the present application provides such an electronic device, which includes the optical lens in the above exemplary embodiment. The electronic device also includes an imaging element or a light source, wherein the imaging element is located on the second side of the optical lens and is used to convert the optical image or optical information formed by the optical lens into an electrical signal, and the light from the first side is imaged on the second side after passing through the optical lens and the imaging element; the light source is located on the second side of the optical lens, and the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

[0024] According to the embodiment of the present application, the optical lens adopts six lenses, and the fifth lens is convex to the second side. By controlling the ratio of the curvature radius of the first side surface of the fifth lens to the total effective focal length of the optical lens, the fifth lens can be made into a meniscus lens concave to the first side, effectively avoiding ghost images caused by reflection of light on the first side surface, the second side surface and the imaging surface or the image source surface of the second side of the fifth lens, thereby improving the imaging quality of the optical lens; at the same time, by controlling the relationship between the effective focal length of the fourth lens, the effective focal length of the fifth lens and the total effective focal length of the optical lens, the fourth lens and the fifth lens can be made into positive lenses, and the effective focal lengths of the fourth lens and the fifth lens are controlled to be within a reasonable range, effectively compressing the incident angle of the light on the rear lens, and improving the relative illumination of the optical lens, for example, the relative illumination of the optical lens in a large field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0026] Figure 1 A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0027] Figure 2 shows a modulation transfer function (MTF) curve of the optical lens according to Example 1 of the present application;

[0028] Figure 3 shows a relative illumination curve of the optical lens according to Example 1 of the present application;

[0029] Figure 4 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0030] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0031] Figure 6 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0032] Figure 7 shows a modulation transfer function curve of the optical lens according to Example 4 of the present application;

[0033] Figure 8 shows a relative illumination curve of the optical lens according to Example 4 of the present application;

[0034] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0035] Fig.10 A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0036] Fig.11 shows a modulation transfer function curve of the optical lens according to Example 6 of the present application;

[0037] Fig.12 shows a relative illumination curve of the optical lens according to Example 6 of the present application;

[0038] Fig.13 A schematic structural diagram of an optical lens according to Embodiment 7 of the present application is shown;

[0039] Fig.14 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown;

[0040] Fig.15 shows a modulation transfer function curve of the optical lens according to Example 8 of the present application;

[0041] Fig.16 shows a relative illumination curve of the optical lens according to Example 8 of the present application;

[0042] Fig.17 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown;

[0043] Fig.18 A schematic structural diagram of an optical lens according to embodiment 10 of the present application is shown. DETAILED DESCRIPTION

[0044] 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 do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0045] 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.

[0046] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. 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 for illustration only and are not drawn strictly to scale.

[0047] 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 first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens.

[0048] It should also be understood that the terms "include", "comprising", and / or "having", 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 describing embodiments of the present application, the term "may" is used to indicate "one or more embodiments of the present application". Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0049] 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.

[0050] 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.

[0051] The features, principles and other aspects of the present application are described in detail below.

[0052] The optical lens according to an exemplary embodiment of the present application may include, for example, six lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, and the six lenses are arranged in sequence from the first side to the second side along the optical axis.

[0053] In an exemplary embodiment, the optical lens may be used as, for example, an imaging lens, in which case the first side of the optical lens may be an object side and the second side may be an image side. Light from the object side may be imaged on the image side. The second side of the optical lens is provided with an imaging surface of the optical lens.

[0054] In an exemplary embodiment, the optical lens can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the second side of the optical lens can be an image source side, and the first side can be an imaging side. Light from the image source side can be imaged on the imaging side. The second side of the optical lens is provided with an image source surface of the optical lens.

[0055] In an exemplary embodiment, the first lens may have a negative optical power, and its first side surface may be, for example, a convex surface, and the second side surface may be, for example, a concave surface. The first lens is a negative lens, and the first side surface is set as a convex surface, which can effectively compress the angle between the edge large field of view light and the first side surface when it is incident, thereby effectively avoiding the introduction of more off-axis aberrations at the front end of the optical lens, such as field curvature, coma, astigmatism, and distortion. At the same time, the first side surface of the first lens is convex, which is conducive to collecting as many large field of view lights as possible, and refracting the large field of view lights in the direction close to the optical axis, increasing the amount of light passing, compressing the imaging height, and reducing the difficulty of lens processing, thereby realizing the miniaturization of the back-end system. In addition, the second side surface of the first lens is set as a concave surface, which can diverge the light passing through the first side surface, which is conducive to the rear system to correct the aberrations generated by the large field of view light, and realize the high resolution of the optical lens. In addition, the first lens is made of a high refractive index material, which is conducive to reducing the front port diameter of the optical lens and improving the imaging quality of the optical lens.

[0056] In an exemplary embodiment, the second lens may have a negative optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a concave surface. The second lens is a negative lens, which collects the light emitted from the first lens and appropriately diverges it. The first side surface of the second lens is a convex surface, which can cooperate with the second side surface of the first lens to converge the light on the second side surface of the first lens and smoothly transition it to the rear system, thereby reducing the sensitivity of the optical lens. The second side surface of the second lens is a concave surface, which is curved in the same direction as the first side surface, which can effectively reduce the degree of deflection of the light on the second side surface, reduce aberrations, and thus improve the imaging quality of the optical lens.

[0057] In an exemplary embodiment, the second side surface of the third lens has at least one inflection point.

[0058] In an exemplary embodiment, the third lens may have positive optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a convex surface. The third lens is a positive lens, which can converge the divergent light emitted from the second lens, and adopts a glass aspheric surface to correct the off-axis aberration; at the same time, the third lens is set to be biconvex, which can collect as much large-angle light as possible and effectively converge the light, reduce light energy loss, improve the illumination of the edge field of view, and facilitate the smooth transition of light to the rear system, reduce sensitivity, and improve image quality.

[0059] In an exemplary embodiment, the third lens may have positive focal power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a concave surface. The third lens is a positive lens, which can converge the divergent light emitted from the second lens, and adopts a glass aspheric surface to correct the off-axis aberration. At the same time, the light emitted from the third lens is still divergent as a whole, which effectively increases the entrance pupil diameter of the optical lens and increases the amount of light entering the optical lens; the first side surface of the third lens is a convex surface, which cooperates with the two concave surfaces of the first lens and the second lens to converge the light and make the light trend transition smoothly, which is conducive to reducing the sensitivity of the optical lens, so that the light smoothly transitions to the rear system, and is also conducive to controlling the light aperture of the rear lens, and realizing the miniaturization design of the optical lens; the second side surface of the third lens is a concave surface, which is curved in the same direction as the first side surface, reducing the deflection of the light on the second side surface of the third lens, reducing aberrations, and improving the imaging quality of the optical lens.

[0060] In an exemplary embodiment, the fourth lens may have positive focal power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a convex surface. The fourth lens is a spherical lens with positive focal power and is placed on the second side of the aperture, which is conducive to converging light from the front end; the first side surface of the fourth lens is a convex surface, which is conducive to quickly reducing the height of the light at the aperture, reducing the angle between the incident light of the edge large field of view and the normal of the first side surface of the fourth lens, reducing the sensitivity of the optical lens, and at the same time, it is conducive to correcting the aberration generated by the aperture and improving the resolution of the optical lens; the second side surface of the fourth lens is a convex surface, which can appropriately converge the light and make it smoothly transition to the imaging surface or the image source surface, reduce the angle of the light incident to the imaging surface or the image source surface, and realize the small principal light angle of the optical lens.

[0061] In an exemplary embodiment, the fourth lens may have positive power, and its first side surface may be, for example, a concave surface, and its second side surface may be, for example, a convex surface. The fourth lens is a spherical lens with positive power and is placed on the second side of the aperture, which is conducive to converging the light from the front end; the first side surface of the fourth lens is a concave surface, which is conducive to receiving the light passing through the third lens and properly diverging it, so that the rear light converges slowly, and the light in the edge field of view shows an upward trend, further increasing the optical path of the light in the large field of view, which is conducive to correcting the off-axis aberration of the optical lens; the second side surface of the fourth lens is a convex surface, which can properly converge the light and make it smoothly transition to the imaging surface or the image source surface, reduce the angle of the light incident on the imaging surface or the image source surface, and realize the small principal light angle of the optical lens.

[0062] In an exemplary embodiment, the fourth lens may have positive power, and its first side surface may be, for example, a plane, and its second side surface may be, for example, a convex surface. The fourth lens is a spherical lens with positive power and is placed on the second side of the aperture, which is conducive to converging the light from the front end; the first side surface of the fourth lens is a plane, which is conducive to reducing the sensitivity of the fourth lens. At the same time, the plane is directly used for support during the assembly process, which is conducive to reducing the tolerance generated during the production and assembly process and improving the production yield of the fourth lens; the second side surface of the fourth lens is a convex surface, which can appropriately converge the light and make it smoothly transition to the imaging surface or the image source surface, reduce the angle of the light incident on the imaging surface or the image source surface, and realize the small principal light angle of the optical lens.

[0063] In an exemplary embodiment, the optical lens may further include an aperture, which may be, for example, disposed between the third lens and the fourth lens. By disposing the aperture between the third lens and the fourth lens, it is beneficial for the light to smoothly transition to the rear of the system, reduce the aperture of the rear lens, and reduce the assembly sensitivity of the optical lens. At the same time, the optical lens is divided into a first lens group with negative optical power and a second lens group with positive optical power, forming a reverse telephoto structure, which can effectively improve the imaging quality of the edge field of view, while effectively reducing the effective radius of the aspheric surface of the third lens, and reducing the production cost of the third lens. It should be understood that the aperture being disposed between the third lens and the fourth lens is merely exemplary, and the present application does not impose specific restrictions on this, and the aperture may also be disposed at other positions according to actual needs.

[0064] In an exemplary embodiment, the fifth lens may have positive focal power, and its first side surface may be, for example, a concave surface, and its second side surface may be, for example, a convex surface. The fifth lens is a spherical lens with positive focal power, which effectively compresses the light aperture in the overall optical path, so that the fifth lens smoothly receives the light and smoothly transitions it to the rear system, reducing the incident height of the light on the rear aspheric surface, thereby effectively reducing the sensitivity of the aspheric lens; the fifth lens is a meniscus convex to the second side, and the first side surface is a concave surface, which is conducive to adjusting the light trend, so that it passes smoothly through the fifth lens, and appropriately diverges the light emitted by the fourth lens, so that the light is deflected in a direction away from the optical axis, increasing the height of the imaging surface or image source surface on the second side; the second side surface of the fifth lens is a convex surface, which is conducive to converging the light and smoothly transitioning it to the imaging surface or image source surface on the second side, reducing the incident angle of the light on the imaging surface or image source surface on the second side, and realizing a small principal light angle of the optical lens.

[0065] In an exemplary embodiment, the sixth lens may have positive optical power, and its first side surface may be, for example, a convex surface, and its second side surface may be, for example, a convex surface. The sixth lens is an aspheric lens with positive optical power, which is conducive to smoothly receiving the light converged by the fifth lens, reducing the angle of light emission, and using the aberration correction ability of the aspheric lens to correct the negative spherical aberration and marginal coma generated by the fifth lens; the sixth lens is biconvex, which is conducive to further converging the light, deflecting the light in the direction close to the optical axis and smoothly converging it to the imaging surface or image source surface on the second side, reducing the incident angle of the light on the imaging surface or image source surface on the second side, and realizing a small principal light angle of the optical lens; the first side surface is convex and relatively curved, which is conducive to smoothly receiving the light converged by the fifth lens, reducing the high-order aberrations generated by the front-end system, and thus improving the image quality.

[0066] In an exemplary embodiment, the optical lens may further include a filter between the sixth lens and the imaging surface or the image source surface to filter light with different wavelengths. The optical lens may also be provided with a protective glass between the filter and the imaging surface according to actual needs to prevent internal components (e.g., chips) of the optical lens from being damaged.

[0067] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side. Optionally, the photosensitive element disposed on the second side may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0068] In an exemplary embodiment, the Abbe number Nd1 of the first lens may satisfy: 1.77≤Nd1≤1.95. Preferably, 1.8≤Nd1≤1.92. The first lens is made of a high refractive index material, and the refractive index of the first lens is constrained within a certain range, which is conducive to reducing the aperture of the first side of the first lens, that is, reducing the front port aperture of the optical lens, and improving the imaging quality of the optical lens.

[0069] In an exemplary embodiment, the effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens may satisfy: 1.6≤F / ENPD≤1.8. Preferably, 1.6≤F / ENPD≤1.7. Reasonable configuration of the ratio of the total effective focal length of the optical lens to the entrance pupil diameter of the optical lens may enable the optical lens to have a smaller aperture number, which is conducive to increasing the light throughput of the optical lens.

[0070] In an exemplary embodiment, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens may satisfy: 0<TTL / H / FOV×1°≤0.04. Preferably, 0.01≤TTL / H / FOV×1°≤0.02. Reasonable configuration of the relationship between the total optical length of the optical lens, the image height corresponding to the maximum field of view of the optical lens, and the maximum field of view of the optical lens can make the total optical length of the optical lens smaller, which is conducive to miniaturization of the optical lens.

[0071] In an exemplary embodiment, the radius of curvature R9 of the first side surface of the fifth lens and the effective focal length F of the optical lens may satisfy: -11.7≤R9 / F≤-1. Preferably, -9.2≤R9 / F≤-2.8. The fifth lens is a meniscus lens convex to the second side. By properly configuring the ratio of the radius of curvature of the first side surface of the fifth lens to the total effective focal length of the optical lens, the fifth lens may be a meniscus lens concave to the first side, effectively avoiding ghost images caused by reflection of light on the first side surface, the second side surface and the imaging surface or image source surface of the second side of the fifth lens, thereby improving the imaging quality of the optical lens.

[0072] In an exemplary embodiment, the on-axis distance TH9 from the first side surface of the fifth lens to the imaging surface or image source surface on the second side of the optical lens and the effective focal length F of the optical lens may satisfy: 4≤TH9 / F≤6. Preferably, 4.8≤TH9 / F≤5.4. Reasonable configuration of the ratio of the on-axis distance from the first side surface of the fifth lens to the imaging surface or image source surface on the second side of the optical lens to the effective focal length of the optical lens can effectively avoid ghost images caused by light being reflected from the first side surface, the second side surface, and the imaging surface or image source surface on the second side of the fifth lens.

[0073] In an exemplary embodiment, the effective focal length F4 of the fourth lens, the effective focal length F5 of the fifth lens and the effective focal length F of the optical lens may satisfy: 14≤(F4+F5) / F≤58. Preferably, 23≤(F4+F5) / F≤50. The fourth lens and the fifth lens are positive lenses, and the relationship between the effective focal length of the fourth lens, the effective focal length of the fifth lens and the total effective focal length of the optical lens is reasonably configured, so that the effective focal length of the fourth lens and the fifth lens can be controlled within a reasonable range, effectively compressing the incident angle of the light on the rear lens, and improving the relative illumination of the optical lens. For example, when the optical lens is a wide-angle lens, the relative illumination of the optical lens in a large field of view is improved.

[0074] In an exemplary embodiment, the curvature radius R12 of the second side surface of the sixth lens and the curvature radius R11 of the first side surface of the sixth lens may satisfy: -5.9≤R12 / R11≤-2.4. Preferably, -5.2≤R12 / R11≤-3. Reasonable configuration of the ratio of the curvature radius of the second side surface of the sixth lens to the curvature radius of the first side surface of the sixth lens can effectively improve the resolution of the optical lens.

[0075] In an exemplary embodiment, the radius of curvature R10 of the second side surface of the fifth lens, the center thickness d9 of the fifth lens on the optical axis, and the radius of curvature R9 of the first side surface of the fifth lens may satisfy: 0.69≤(R10-d9) / R9≤1.6. Preferably, 0.8≤(R10-d9) / R9≤1.5. The fifth lens is a meniscus lens with positive optical power, which can effectively converge the light in front. The relationship between the radius of curvature of the second side surface of the fifth lens, the center thickness of the fifth lens on the optical axis, and the radius of curvature of the first side surface of the fifth lens is reasonably configured, and the tolerance sensitivity of the optical lens is effectively reduced.

[0076] In an exemplary embodiment, the effective focal length F2 of the second lens and the effective focal length F of the optical lens may satisfy: -3≤F2 / F≤-2. Preferably, -2.6≤F2 / F≤-2.1. The second lens may receive the light from the first lens and smoothly transition it to the third lens. Reasonable configuration of the ratio of the effective focal length of the second lens to the effective focal length of the optical lens may effectively improve the angular resolution of the edge field of view.

[0077] In an exemplary embodiment, the radius of curvature R4 of the second side surface of the second lens and the radius of curvature R2 of the second side surface of the first lens may satisfy: 0.4≤R4 / R2≤0.8. Preferably, 0.5≤R4 / R2≤0.6. Both the first lens and the second lens are meniscus lenses with negative optical power, which can receive light with a large field of view angle, and compress the edge large-angle light and then transition it to the rear system. By constraining the ratio of the radius of curvature of the second side surface of the second lens to the radius of curvature of the second side surface of the first lens within a certain range, it is beneficial for the first lens and the second lens to receive light with a large field of view and increase the field of view angle of the optical lens.

[0078] In an exemplary embodiment, the radius of curvature R1 of the first side surface of the first lens and the effective focal length F of the optical lens may satisfy: 5.9≤R1 / F≤6.6. Preferably, 6≤R1 / F≤6.5. The first lens is a meniscus lens concave toward the first side. Reasonable configuration of the ratio of the radius of curvature of the first side surface of the first lens to the effective focal length of the optical lens can enable the first lens to collect as much light with a large field of view angle as possible and allow the light to smoothly enter the rear system, thereby increasing the light throughput of the optical lens and effectively expanding the field of view of the optical lens.

[0079] In an exemplary embodiment, the effective focal length F5 of the fifth lens and the effective focal length F2 of the second lens may satisfy: -23≤F5 / F2≤-4. Preferably, -20≤F5 / F2≤-8. The second lens is a meniscus lens convex to the first side, and the fifth lens is a meniscus lens convex to the second side, and the two are symmetrically arranged relative to the aperture stop. The ratio of the effective focal length of the fifth lens to the effective focal length of the second lens is reasonably configured, and the symmetrical structure can be used to correct the large field of view spherical aberration and improve the resolution of the optical lens.

[0080] In an exemplary embodiment, the effective focal length F1 of the first lens, the effective focal length F2 of the second lens, and the axial distance d2 from the second side surface of the first lens to the first side surface of the second lens may satisfy: 0.4 mm -1 ≤F1 / F2 / d2≤1mm -1 Preferably, 0.5 mm -1 ≤F1 / F2 / d2≤0.8mm -1 Both the first lens and the second lens are meniscus lenses with negative optical power, which are conducive to smoothly receiving light with a large field of view. By rationally configuring the relationship between the effective focal length of the first lens, the effective focal length of the second lens, and the on-axis distance from the second side surface of the first lens to the first side surface of the second lens, the compression ratio of the rear-end light can be controlled, effectively improving the image quality of the optical lens.

[0081] In an exemplary embodiment, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R8 of the second side surface of the fourth lens may satisfy: -2.5≤R5 / R8≤-0.5. Preferably, -2.2≤R5 / R8≤-0.9. The third lens and the fourth lens are respectively disposed on both sides of the aperture, and the shape of the first side surface of the third lens and the shape of the second side surface of the fourth lens are symmetrical with respect to the aperture. The ratio of the radius of curvature of the first side surface of the third lens to the radius of curvature of the second side surface of the fourth lens is reasonably configured, which can effectively improve the image quality of the optical lens.

[0082] In an exemplary embodiment, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens may satisfy: 0.1≤F / H≤0.4. Preferably, 0.2≤F / H≤0.3. The ratio of the total effective focal length of the optical lens to the image height corresponding to the maximum field angle of the optical lens is reasonably configured so that the field angle of the optical lens matches the image height, and the image height of the optical lens is relatively large, which effectively improves the resolution of the optical lens.

[0083] In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens may satisfy: -5.2≤F1 / F≤-3.8. Preferably, -5≤F1 / F≤-4. Reasonable configuration of the ratio of the effective focal length of the first lens to the total effective focal length of the optical lens is conducive to the first lens smoothly receiving the light of a large field of view and appropriately diverging it, achieving a smooth transition of the light, and is conducive to improving the image quality of the optical lens.

[0084] In an exemplary embodiment, the radius of curvature R4 of the second side surface of the second lens and the axial distance d4 from the second side surface of the second lens to the first side surface of the third lens may satisfy: 0.8≤R4 / d4≤1.62. Preferably, 1≤R4 / d4≤1.5. Reasonable configuration of the ratio of the radius of curvature of the second side surface of the second lens to the axial distance from the second side surface of the second lens to the first side surface of the third lens is conducive to constraining the overall shape of the second lens, so that light with a smaller angle can be emitted from the second side surface of the second lens, effectively compressing the angle of the light between the second lens and the third lens, reducing the high-order aberrations introduced by the rear system, and thus improving the image quality of the optical lens.

[0085] In an exemplary 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 may satisfy: 2.5≤R1 / R2≤3. Preferably, 2.6≤R1 / R2≤2.9. The first lens is a meniscus lens, and the first side surface and the second side surface are oriented in the same direction, which can converge light. Reasonable configuration of the ratio of the radius of curvature of the first side surface of the first lens to the radius of curvature of the second side surface of the first lens can effectively reduce the central spherical aberration, edge field curvature and astigmatism value introduced by the first lens, avoid the problem of increased difficulty in aberration correction due to excessive aberration introduced by the first lens, and help improve the image quality of the optical lens.

[0086] In an exemplary embodiment, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens may satisfy: 0.166≤BFL / TTL≤0.3. Preferably, 0.18≤BFL / TTL≤0.22. Reasonable configuration of the ratio of the back focal length of the optical lens to the total optical length of the optical lens is conducive to achieving a short back focal length of the optical lens, and is conducive to miniaturization of the optical lens while ensuring that there is sufficient space for the installation and focusing of optical elements.

[0087] In an exemplary embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens can satisfy the following: 0.0065≤D / H / FOV×1°≤0.05. Preferably, 0.01≤D / H / FOV×1°≤0.02. Reasonable configuration of the ratio of the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height corresponding to the maximum field of view of the optical lens, and the maximum field of view of the optical lens is conducive to miniaturization and large image surface of the optical lens.

[0088] In an exemplary embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the total effective focal length F of the optical lens can satisfy: 0.86 mm -1 ≤D / H / F≤1.5mm -1 Preferably, 0.9 mm -1 ≤D / H / F≤1.0mm -1 Reasonable configuration of the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, and the ratio of the image height corresponding to the maximum field of view of the optical lens to the total effective focal length of the optical lens are conducive to realizing the small aperture characteristics of the optical lens.

[0089] In an exemplary embodiment, the maximum field of view FOV of the optical lens and the total effective focal length F of the optical lens may satisfy: 84° / mm≤FOV / F≤90° / mm. Preferably, 86° / mm≤FOV / F≤88° / mm. Reasonable configuration of the ratio of the maximum field of view of the optical lens to the total effective focal length of the optical lens is conducive to achieving a large field of view of the optical lens, so that the details of the object being photographed are clearly captured, thereby achieving a high-definition shooting effect of the optical lens.

[0090] In an exemplary embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens may satisfy: 1.6≤F3 / F≤15. Preferably, 4.4≤F3 / F≤12.6. The third lens is a positive lens, and a reasonable configuration of the ratio of the effective focal length of the third lens to the total effective focal length of the optical lens can appropriately converge the light from the front, which is beneficial to improving the image quality of the optical lens.

[0091] In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens may satisfy: 1.4≤F4 / F≤9.2. Preferably, 3≤F4 / F≤7.6. The fourth lens is a positive lens, and a reasonable configuration of the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical lens can properly converge the light from the front and smoothly transition it to the rear system, which is beneficial to improving the image quality of the optical lens.

[0092] In an exemplary embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens may satisfy: 12.9≤F5 / F≤51. Preferably, 20≤F5 / F≤43. The fifth lens is a positive lens, and a reasonable configuration of the ratio of the effective focal length of the fifth lens to the total effective focal length of the optical lens can properly converge the light from the front and smoothly transition it to the rear system, which is beneficial to improving the image quality of the optical lens.

[0093] In an exemplary embodiment, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens may satisfy: 3.5≤F6 / F≤5.0. Preferably, 3.8≤F6 / F≤4.8. The sixth lens is a positive lens, and a reasonable configuration of the ratio of the effective focal length of the sixth lens to the total effective focal length of the optical lens can properly converge the light from the front and smoothly transition it to the rear system, which is beneficial to improving the image quality of the optical lens.

[0094] In an exemplary embodiment, the radius of curvature R9 of the first side surface of the fifth lens and the radius of curvature R10 of the second side surface of the fifth lens may satisfy: 0.8≤R9 / R10≤1.4. Preferably, 0.9≤R9 / R10≤1.3. The fifth lens is a meniscus lens with positive optical power, which can properly converge the light from the front. The ratio of the radius of curvature of the first side surface of the fifth lens to the radius of curvature of the second side surface of the fifth lens is reasonably configured, and the radius of curvature of the two side surfaces is made closer, which can effectively reduce the tolerance sensitivity of the optical lens.

[0095] In an exemplary embodiment, the radius of curvature R9 of the first side surface of the fifth lens and the effective focal length F5 of the fifth lens may satisfy: -0.27≤R9 / F5≤-0.01. Preferably, -0.23≤R9 / F5≤-0.06. Reasonable configuration of the ratio of the radius of curvature of the first side surface of the fifth lens to the effective focal length of the fifth lens may make the fifth lens a positive lens and the first side surface a concave surface, which is conducive to achieving a larger amount of light entering and increasing the illumination of the picture.

[0096] In an exemplary embodiment, the radius of curvature R10 of the second side surface of the fifth lens and the effective focal length F5 of the fifth lens may satisfy: -0.27≤R10 / F5≤-0.03. Preferably, -0.17≤R10 / F5≤-0.08. Reasonable configuration of the ratio of the radius of curvature of the second side surface of the fifth lens to the effective focal length of the fifth lens may make the fifth lens a positive lens and the second side surface a convex surface, which is beneficial for the second side surface of the fifth lens to properly converge the light from the first side surface of the fifth lens, reduce the sensitivity of the light, and be beneficial to correct aberrations and improve the resolution of the optical lens.

[0097] In an exemplary embodiment, the on-axis distance d8 from the second side surface of the fourth lens to the first side surface of the fifth lens and the total optical length TTL of the optical lens may satisfy: 0.001≤d8 / TTL≤0.04. Preferably, 0.005≤d8 / TTL≤0.03. The fourth lens and the fifth lens are both positive lenses, which can properly converge the light. By controlling the on-axis distance from the second side surface of the fourth lens to the first side surface of the fifth lens, the total optical length of the optical lens can be effectively reduced, thereby realizing miniaturization of the optical lens.

[0098] In an exemplary embodiment, the on-axis distance d10 from the second side surface of the fifth lens to the first side surface of the sixth lens and the total optical length TTL of the optical lens may satisfy: 0.001≤d10 / TTL≤0.08. Preferably, 0.005≤d10 / TTL≤0.05. The fifth lens and the sixth lens are both positive lenses, which can properly converge the light. By controlling the on-axis distance from the second side surface of the fifth lens to the first side surface of the sixth lens, the total optical length of the optical lens can be effectively reduced, thereby realizing miniaturization of the optical lens.

[0099] In an exemplary embodiment, the radius of curvature R9 of the first side surface of the fifth lens and the effective focal length F4 of the fourth lens can satisfy: -2.83≤R9 / F4≤-0.2. Preferably, -2.2≤R9 / F4≤-0.4. The fifth lens is a meniscus lens convex to the second side, and the ratio of the radius of curvature of the first side surface of the fifth lens to the effective focal length of the fourth lens is reasonably configured so that the first side surface of the fifth lens smoothly receives the light converged by the fourth lens, that is, the light emitted from the fourth lens is smoothly incident on the fifth lens after being deflected by the first side surface of the fifth lens, thereby improving the resolution capability; in addition, ghost images caused by reflection of light on the first side surface, the second side surface and the imaging surface or the image source surface of the second side of the fifth lens can be effectively avoided, thereby further improving the imaging quality of the optical lens.

[0100] In an exemplary embodiment, the radius of curvature R4 of the second side surface of the second lens and the sag4 of the second side surface of the second lens can satisfy: 6.7≤sag4×(2×R4-sag4)≤10.5. Preferably, 7.5≤sag4×(2×R4-sag4)≤9.7. Reasonable configuration of the ratio of the radius of curvature of the second side surface of the second lens to the sag4 of the second side surface of the second lens can reduce the angle of light emitted through the second side surface of the second lens and make it smoothly transition to the third lens. In other words, the third lens can smoothly receive the light emitted through the second lens; at the same time, it is also beneficial to constrain the overall shape of the second lens, so that light with a smaller angle can be emitted from the second side surface of the second lens, effectively compressing the angle of light between the second lens and the third lens, reducing the high-order aberrations introduced by the rear-end optical path, and improving image quality.

[0101] In an exemplary embodiment, the surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may have one or more aspherical surfaces, and the aspherical surface has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving aberration. The use of the aspherical surface can eliminate the aberration occurring during imaging as much as possible, thereby improving the imaging quality.

[0102] The optical lens according to the above-mentioned embodiment of the present application can adopt multiple lenses, such as the six lenses mentioned above. By reasonably allocating the optical parameters of each lens, the optical lens has a small aperture, miniaturization, weak ghost image, high illumination, high resolution, low sensitivity, large angular resolution, large field of view, and high light flux, and can be well matched with, for example, vehicle-mounted chips without producing dark corners. The optical lens has good temperature performance, the imaging effect changes little under high and low temperatures, and the image quality is stable. Therefore, the optical lens according to the above-mentioned embodiment of the present application can better meet the requirements of, for example, vehicle-mounted applications.

[0103] Those skilled in the art should understand that the total optical length TTL of the optical lens used above refers to the on-axis distance from the first side surface of the first lens to the imaging plane or the image source plane; the back focal length BFL of the optical lens refers to the on-axis distance from the second side surface of the sixth lens to the imaging plane or the image source plane; and the maximum field of view FOV of the optical lens is associated with the image height H, which refers to the field of view corresponding to the image height H.

[0104] 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 optical lens can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical lens is not limited to including six lenses. If necessary, the optical lens may also include other numbers of lenses.

[0105] Specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0106] It should be noted that the optical lenses provided in Examples 1 to 10 of the present application can all achieve good imaging quality, and their modulation transfer function curves and relative illumination curves are relatively close. Therefore, the present application only exemplarily shows the modulation transfer function curves and relative illumination curves of Examples 1, 4, 6 and 8, and the modulation transfer function curves and relative illumination curves of other embodiments are no longer shown one by one, and those skilled in the art should also be able to know based on the contents disclosed in this application. Example 1

[0107] The following reference Figure 1 The optical lens according to Example 1 of the present application is described.

[0108] like Figure 1 As shown, the optical lens includes, 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 and a sixth lens L6. A stop STO may be disposed between the third lens L3 and the fourth lens L4.

[0109] The first lens L1 has negative refractive power, and its first side surface S1 is a convex surface, and its second side surface S2 is a concave surface.

[0110] The second lens L2 has negative refractive power, and its first side surface S3 is a convex surface, and its second side surface S4 is a concave surface.

[0111] The third lens L3 has positive refractive power, and its first side surface S5 is convex, and its second side surface S6 is concave.

[0112] The fourth lens L4 has positive refractive power, and its first side surface S7 is a convex surface, and its second side surface S8 is a convex surface.

[0113] The fifth lens L5 has positive refractive power, and its first side surface S9 is concave, and its second side surface S10 is convex.

[0114] The sixth lens L6 has positive refractive power, and its first side surface S11 is a convex surface, and its second side surface S12 is a convex surface.

[0115] An image plane IMA is disposed on the second side of the optical lens, and a filter BPF is disposed between the sixth lens L6 and the image plane IMA, and the filter BPF has a first side surface S13 and a second side surface S14. When IMA is an imaging surface, light from an object sequentially passes through each surface S1 to S14 and is finally imaged on IMA. When IMA is an image source surface, light from IMA sequentially passes through each surface S14 to S1 and is finally projected on the object.

[0116] Table 1 shows the basic parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0117] Table 1

[0118]

[0119] In Example 1, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces, and the surface shape of each aspherical surface can be defined by but not limited to the following aspherical surface formula:

[0120] (1)

[0121] in, 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 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspheric surface S5, S6, S11 and S12 in Example 1.

[0122] Table 2

[0123]

[0124] from Figure 2 From the above, the MTF value of the central field of view of the optical lens of Example 1 at a spatial frequency of 25 lp / mm (25 lines / mm) exceeds 0.92, and the MTF value of the edge field of view at a spatial frequency of 25 lp / mm (25 lines / mm) exceeds 0.63. Figure 3 From the above, the relative illumination of the optical lens of Example 1 in the edge field of view is 62.5%. Therefore, the optical lens of Example 1 has good imaging quality. Example 2

[0125] The following reference Figure 4 The optical lens according to Embodiment 2 of the present application is described. Figure 4 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0126] Table 3 shows the basic parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0127] Table 3

[0128]

[0129] In Example 2, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 4 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 2.

[0130] Table 4

[0131]

[0132] The MTF value of the central field of view of the optical lens of Example 2 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.92, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.52. The relative illumination of the optical lens of Example 2 at the edge field of view is 64.5%. Therefore, the optical lens provided in Example 2 has good imaging quality. Example 3

[0133] The following reference Figure 5 The optical lens according to Embodiment 3 of the present application is described. Figure 5 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a concave surface.

[0134] Table 5 shows the basic parameter table of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0135] Table 5

[0136]

[0137] In Example 3, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 6 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 3.

[0138] Table 6

[0139]

[0140] The MTF value of the central field of view of the optical lens of Example 3 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.89, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.51. The relative illumination of the optical lens of Example 3 at the edge field of view is 65.9%. Therefore, the optical lens provided in Example 3 has good imaging quality. Example 4

[0141] The following reference Figure 6 The optical lens according to Embodiment 4 of the present application is described. Figure 6 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a concave surface.

[0142] Table 7 shows the basic parameter table of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0143] Table 7

[0144]

[0145] In Example 4, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 8 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 4.

[0146] Table 8

[0147]

[0148] from Figure 7 From the above, the MTF value of the central field of view of the optical lens of Example 4 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.91, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.58. Figure 8 From the above, the relative illumination of the optical lens of Example 4 in the edge field of view is 68.8%. Therefore, the optical lens of Example 4 has good imaging quality. Example 5

[0149] The following reference Fig. 9 The optical lens according to Embodiment 5 of the present application is described. Fig. 9As shown, compared with Example 1, the main differences of this embodiment are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; the second side surface S6 of the third lens L3 is a convex surface; and the first side surface S7 of the fourth lens L4 is a concave surface.

[0150] Table 9 shows the basic parameter table of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0151] Table 9

[0152]

[0153] In Example 5, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 10 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 5.

[0154] Table 10

[0155]

[0156] The MTF value of the central field of view of the optical lens of Example 5 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.94, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.57. The relative illumination of the optical lens of Example 5 at the edge field of view is 63.4%. Therefore, the optical lens provided in Example 5 has good imaging quality. Example 6

[0157] The following reference Fig.10 The optical lens according to Example 6 of the present application is described. Fig.10 As shown, compared with Example 1, the main differences of this embodiment are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; the second side surface S6 of the third lens L3 is a convex surface; and the first side surface S7 of the fourth lens L4 is a concave surface.

[0158] Table 11 shows the basic parameter table of the optical lens of Example 6, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0159] Table 11

[0160]

[0161] In Example 6, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 12 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 6.

[0162] Table 12

[0163]

[0164] from Fig.11 From the above, it can be seen that the MTF value of the central field of view of the optical lens of Example 6 exceeds 0.94 at a spatial frequency of 25lp / mm (25 lines / mm), and the MTF value of the edge field of view exceeds 0.59 at a spatial frequency of 25lp / mm (25 lines / mm). Fig.12 It is shown that the relative illumination of the edge field of view of the optical lens of Example 6 is 62.9%. Therefore, the optical lens provided in Example 6 has good imaging quality. Example 7

[0165] The following reference Fig.13 The optical lens according to Example 7 of the present application is described. Fig.13 As shown, the main differences between this embodiment and Embodiment 1 are that: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a plane.

[0166] Table 13 shows the basic parameter table of the optical lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0167] Table 13

[0168]

[0169] In Example 7, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 14 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 7.

[0170] Table 14

[0171]

[0172] The MTF value of the central field of view of the optical lens of Example 7 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.93, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.60. The relative illumination of the optical lens of Example 7 at the edge field of view is 64.2%. Therefore, the optical lens provided in Example 7 has good imaging quality. Example 8

[0173] The following reference Fig.14 The optical lens according to Example 8 of the present application is described. Fig.14 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side surface S7 of the fourth lens L4 is a plane.

[0174] Table 15 shows the basic parameter table of the optical lens of Example 8, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0175] Table 15

[0176]

[0177] In Example 8, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 16 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 8.

[0178] Table 16

[0179]

[0180] from Fig.15 From the above, the MTF value of the central field of view of the optical lens of Example 8 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.94, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.61. Fig.16 From the above, the relative illumination of the optical lens of Example 8 in the edge field of view is 63.0%. Therefore, the optical lens of Example 8 has good imaging quality. Example 9

[0181] The following reference Fig.17 The optical lens according to Example 9 of the present application is described. Fig.17As shown, compared with Example 1, the main differences of this embodiment are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; the second side surface S6 of the third lens L3 is a convex surface; the first side surface S7 of the fourth lens L4 is a plane; and the second side surface S6 of the third lens L3 has at least one inflection point.

[0182] Table 17 shows the basic parameter table of the optical lens of Example 9, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0183] Table 17

[0184]

[0185] In Example 9, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 18 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S5, S6, S11 and S12 in Example 9.

[0186] Table 18

[0187]

[0188] The MTF value of the central field of view of the optical lens of Example 9 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.94, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.59. The relative illumination of the optical lens of Example 9 at the edge field of view is 65.2%. Therefore, the optical lens given in Example 9 has good imaging quality. Example 10

[0189] The following reference Fig.18 The optical lens according to embodiment 10 of the present application is described. Fig.18 As shown, compared with Example 1, the main differences of this embodiment are: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; the second side surface S6 of the third lens L3 is a convex surface; the first side surface S7 of the fourth lens L4 is a plane; and the second side surface S6 of the third lens L3 has at least one inflection point.

[0190] Table 19 shows the basic parameter table of the optical lens of Example 10, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0191] Table 19

[0192]

[0193] In Example 10, the first side surface S5 and the second side surface S6 of the third lens L3 and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. Table 20 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12 and A14 of the aspherical surfaces S5, S6, S11 and S12 that can be used in Example 10.

[0194] Table 20

[0195]

[0196] The MTF value of the central field of view of the optical lens of Example 10 at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.94, and the MTF value of the edge field of view at a spatial frequency of 25lp / mm (25 lines / mm) exceeds 0.59. The relative illumination of the optical lens of Example 10 at the edge field of view is 64.6%. Therefore, the optical lens provided in Example 10 has good imaging quality.

[0197] Table 21 gives the basic parameters of the optical lenses in Examples 1-10, such as F, ENPD, TTL, FOV, H, D, BFL, F1, F2, F3, F4, F5, F6, TH9 and sag4.

[0198] Table 21

[0199]

[0200] In summary, the conditional expressions of each embodiment in Embodiments 1-10 satisfy the relationship shown in Table 22.

[0201] Table 22

[0202]

[0203] The present application also provides an electronic device, which includes the optical lens in the above exemplary embodiment and an imaging element for converting an optical image formed by the optical lens into an electrical signal, wherein the imaging element is arranged on the second side of the optical lens, for example, on the imaging surface, and may be, for example, a photosensitive coupling device (CCD) or a complementary metal oxide semiconductor device (CMOS). Light from the first side passes through the optical lens and forms an image on the second side.

[0204] The present application also provides an electronic device, which includes the optical lens and a light source in the above exemplary embodiment, wherein the light source is located on the second side of the optical lens. The light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

[0205] 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 (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that: The method comprises, in order from the first side to the second side along the optical axis: A first lens having negative optical power, wherein the first side surface is convex and the second side surface is concave; a second lens having negative optical power, wherein the first side surface is convex and the second side surface is concave; a third lens element having positive power, wherein the first side surface of the third lens element is convex; a fourth lens element having positive refractive power, wherein the second side surface of the fourth lens element is convex; a fifth lens having positive power, wherein the first side surface is concave and the second side surface is convex; a sixth lens having positive power, wherein the first side surface is convex and the second side surface is convex; Wherein, the number of lenses having optical power in the optical lens is six; The optical lens satisfies: -11.7≤R9 / F≤-1, 14≤(F4+F5) / F≤58, 4≤TH9 / F≤6, Among them, R9 is the radius of curvature of the first side surface of the fifth lens, F is the total effective focal length of the optical lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, and TH9 is the axial distance from the first side surface of the fifth lens to the imaging surface or image source surface of the second side of the optical lens.

2. The optical lens according to claim 1, characterized in that: The second side surface of the third lens is a convex surface or a concave surface; the first side surface of the fourth lens is a plane surface or a convex surface or a concave surface.

3. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies at least one of the following conditional expressions: 1.6≤F / ENPD≤1.8; 0<TTL / H / FOV×1°≤0.04; 0.1≤F / H≤0.4; 0.166≤BFL / TTL≤0.3;0.0065≤D / H / FOV×1°≤0.05;0.86mm -1 ≤D / H / F≤1.5mm -1 ; Among them, F is the total effective focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, FOV is the maximum field of view angle of the optical lens, BFL is the back focal length of the optical lens, and D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens.

4. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies at least one of the following conditions: 5.9≤R1 / F≤6.6; 2.5≤R1 / R2≤3; 1.77≤Nd1≤1.95; Among them, R1 is the curvature radius of the first side surface of the first lens, F is the total effective focal length of the optical lens, R2 is the curvature radius of the second side surface of the first lens, and Nd1 is the refractive index of the first lens.

5. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies at least one of the following conditions: -3≤F2 / F≤-2; 0.8≤R4 / d4≤1.62; 6.7≤sag4×(2×R4-sag4)≤10.5; Among them, F2 is the effective focal length of the second lens, F is the total effective focal length of the optical lens, R4 is the radius of curvature of the second side surface of the second lens, d4 is the axial distance from the second side surface of the second lens to the first side surface of the third lens, and sag4 is the sag height of the second side surface of the second lens.

6. The optical lens according to claim 1 or 2, characterized in that: The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 1.6≤F3 / F≤15.

7. The optical lens according to claim 1 or 2, characterized in that: The effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: 1.4≤F4 / F≤9.

2.

8. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies at least one of the following conditions: 12.9≤F5 / F≤51; 0.8≤R9 / R10≤1.4; -0.27≤R9 / F5≤-0.01; -0.27≤R10 / F5≤-0 .03; 0.001≤d8 / TTL≤0.04; 0.001≤d10 / TTL≤0.08; 0.69≤(R10-d9) / R9≤1.6; Among them, F5 is the effective focal length of the fifth lens, F is the total effective focal length of the optical lens, R9 is the curvature radius of the first side surface of the fifth lens, R10 is the curvature radius of the second side surface of the fifth lens, d8 is the axial distance from the second side surface of the fourth lens to the first side surface of the fifth lens, TTL is the total optical length of the optical lens, d10 is the axial distance from the second side surface of the fifth lens to the first side surface of the sixth lens, and d9 is the center thickness of the fifth lens on the optical axis.

9. The optical lens according to claim 1 or 2, characterized in that: The effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: 3.5≤F6 / F≤5.

0.

10. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies at least one of the following conditions: 0.4≤R4 / R2≤0.8;0.4mm -1 ≤F1 / F2 / d2≤1mm -1 ; Among them, R4 is the curvature radius of the second side surface of the second lens, R2 is the curvature radius of the second side surface of the first lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, and d2 is the axial distance from the second side surface of the first lens to the first side surface of the second lens.

11. The optical lens according to claim 1 or 2, characterized in that: The effective focal length F5 of the fifth lens and the effective focal length F2 of the second lens satisfy: -23≤F5 / F2≤-4.

12. The optical lens according to claim 1 or 2, characterized in that: A curvature radius R5 of the first side surface of the third lens and a curvature radius R8 of the second side surface of the fourth lens satisfy: -2.5≤R5 / R8≤-0.

5.

13. The optical lens according to claim 1 or 2, characterized in that: A curvature radius R12 of the second side surface of the sixth lens and a curvature radius R11 of the first side surface of the sixth lens satisfy: -5.9≤R12 / R11≤-2.

4.

14. The optical lens according to claim 1 or 2, characterized in that: The effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: -5.2≤F1 / F≤-3.

8.

15. The optical lens according to claim 1 or 2, characterized in that: The maximum field of view FOV of the optical lens and the total effective focal length F of the optical lens satisfy the following conditions: 84° / mm≤FOV / F≤90° / mm.

16. The optical lens according to claim 1 or 2, characterized in that: A curvature radius R9 of the first side surface of the fifth lens and an effective focal length F4 of the fourth lens satisfy: -2.83≤R9 / F4≤-0.

2.

17. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies at least one of the following conditions: 1.8≤Nd1≤1.92;1.6≤F / ENPD≤1.7;0.01≤TTL / H / FOV×1°≤0.02;-9.2≤R9 / F≤-2.8;4.8≤TH9 / F≤5.4;23≤(F4+F5) / F≤50;-5.2≤R12 / R11≤-3;0.8≤(R10-d9) / R9≤1.5;-2.6≤F2 / F≤-2.1;0.5≤R4 / R2≤0.6;6≤R1 / F≤6.5;-20≤F5 / F2≤-8;0.5mm -1 ≤F1 / F2 / d2≤0.8mm -1 ;-2.2≤R5 / R8≤-0.9;0.2≤F / H≤0.3;-5≤F1 / F≤-4;1≤R4 / d4≤1.5;2.6≤R1 / R2≤2.9;0.18≤BFL / TTL≤0.22;0.01≤D / H / FOV×1°≤0.02;0.9mm -1 ≤D / H / F≤1.0mm -1 ;86° / mm≤FOV / F≤88° / mm;4.4≤F3 / F≤12.6;3≤F4 / F≤7.6;20≤F5 / F≤43;3.8≤F6 / F≤4.8;0.9≤R9 / R10≤1.3;-0.23≤R9 / F5≤-0.06;-0.17≤R10 / F5≤-0.08;0.005≤d8 / TTL≤0.03;0.005≤d10 / TTL≤0.05;-2.2≤R9 / F4≤-0.4;7.5≤sag4×(2×R4-sag4)≤9.7; Wherein, Nd1 is the refractive index of the first lens, F is the total effective focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, FOV is the maximum field of view angle of the optical lens, R9 is the curvature radius of the first side surface of the fifth lens, TH9 is the axial distance from the first side surface of the fifth lens to the imaging surface or the image source surface of the second side of the optical lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, R12 is the curvature radius of the second side surface of the sixth lens, R11 is the curvature radius of the first side surface of the sixth lens, R10 is the curvature radius of the second side surface of the fifth lens, d9 is the center thickness of the fifth lens on the optical axis, F2 is the effective focal length of the second lens, R4 is the curvature radius of the second side surface of the second lens, R2 is the first The radius of curvature of the second side of the lens, R1 is the radius of curvature of the first side of the first lens, F1 is the effective focal length of the first lens, d2 is the axial distance from the second side of the first lens to the first side of the second lens, R5 is the radius of curvature of the first side of the third lens, R8 is the radius of curvature of the second side of the fourth lens, d4 is the axial distance from the second side of the second lens to the first side of the third lens, BFL is the back focal length of the optical lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, F3 is the effective focal length of the third lens, F6 is the effective focal length of the sixth lens, d8 is the axial distance from the second side of the fourth lens to the first side of the fifth lens, d10 is the axial distance from the second side of the fifth lens to the first side of the sixth lens, and sag4 is the sag height of the second side of the second lens.

18. An electronic device, characterized in that: The electronic device comprises an optical lens according to any one of claims 1 to 16, wherein the electronic device further comprises an imaging element or a light source, wherein the imaging element is used to convert an optical image or optical information formed by the optical lens into an electrical signal; Wherein, the imaging element is located on the second side of the optical lens, and the light from the first side is imaged on the second side after passing through the optical lens; The light source is located on the second side of the optical lens, and the light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

Images