Optical lens and electronic equipment

Abstract

The invention discloses an optical lens and electronic equipment, and the optical lens sequentially comprises a first lens with positive focal power from a first side to a second side along an optical axis, a second lens with negative focal power, and a third lens with positive focal power from the first side to the second side, the first side surface of the second lens is a concave surface; the third lens has positive focal power; the fourth lens has focal power; the fifth lens has focal power; the sixth lens has focal power; the first side surface of the seventh lens is a convex surface, and the second side surface of the seventh lens is a concave surface; wherein at least two convex surfaces exist among the fourth lens, the fifth lens, the sixth lens and the sixth lens, and the number of the lenses with focal power in the optical lens is seven; the optical lens satisfies 2.2 < = d1 / d2 < = 7, 0.8 < = F1 / F < = 2.8, 0.2 < = d7 / ET7 < = 1.5, and 0.35 < = (d4 + d5 + d6) / F < = 0.9.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens and electronic device. Background Technology

[0002] With the continuous development of automotive lens technology, automotive optical lenses need to meet requirements such as high resolution, miniaturization, temperature stability, low cost, and low sensitivity. However, these requirements can be mutually restrictive. For example, improving resolution usually relies on increasing the number of lenses, which not only directly increases material costs but also complicates the structure and makes temperature stability control more difficult. Module space constraints require lenses to have shorter back focal lengths and more compact installation dimensions, which conflicts with the demand for high light throughput. And while high resolution can provide a margin for performance stability to cope with temperature changes, it contradicts the general demand for small size and low cost.

[0003] Therefore, there is an urgent need for an optical lens that can optimize temperature stability, reduce overall cost, and reduce sensitivity within a compact size. Summary of the Invention

[0004] The first aspect of this application provides an optical lens comprising, sequentially from a first side to a second side along an optical axis: a first lens having positive optical power, the first side of which is convex; a second lens having negative optical power, the first side of which is concave; a third lens having positive optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power; and a seventh lens having optical power, the first side of which is convex and the second side of which is concave; wherein at least two of the fourth to sixth lenses have convex surfaces, and the number of lenses having optical power in the optical lens is seven. The optical lens satisfies the following conditions: 2.2≤d1 / d2≤7, 0.8≤F1 / F≤2.8, 0.2≤d7 / ET7≤1.5, and 0.35≤(d4+d5+d6) / F≤0.9; where d1 is the center thickness of the first lens, d2 is the center thickness of the second lens, F1 is the focal length of the first lens, F is the effective focal length of the optical lens, d7 is the center thickness of the seventh lens, ET7 is the edge thickness of the seventh lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, and d6 is the center thickness of the sixth lens.

[0005] According to an exemplary embodiment of this application, the first lens has a first side surface that is convex and a second side surface that is convex, or the first side surface of the first lens is convex and the second side surface is concave; the second lens has a first side surface that is concave and a second side surface that is convex, or the first side surface of the second lens is concave and the first side surface is concave; the third lens has a first side surface that is convex and a second side surface that is convex, or the first side surface of the third lens is concave and the second side surface is convex, or the first side surface of the third lens is convex and the second side surface is concave; the fourth lens has positive optical power, with its first side surface and second side surface being convex, or the fourth lens has positive optical power, with its first side surface being convex and the second side surface being concave, or the fourth lens has negative optical power, with its first side surface and the second side surface being concave. The fifth lens has positive optical power, with its first side surface being convex and its second side surface being convex; or the fifth lens has positive optical power, with its first side surface being convex and its second side surface being concave; or the fifth lens has positive optical power, with its first side surface being concave and its second side surface being convex; or the fifth lens has negative optical power, with its first side surface being concave and its second side surface being concave; or the fifth lens has negative optical power, with its first side surface being concave and its second side surface being convex; or the fifth lens has negative optical power, with its first side surface being convex and its second side surface being concave. The sixth lens has positive optical power. The first side of the lens is convex, and the second side is convex; or the sixth lens has positive optical power and its first side is concave and its second side is convex; or the sixth lens has positive optical power and its first side is convex and its second side is concave; or the sixth lens has negative optical power and its first side is concave and its second side is concave; or the sixth lens has negative optical power and its first side is concave and its second side is convex; or the sixth lens has negative optical power and its first side is convex and its second side is concave; the seventh lens has positive optical power, or the seventh lens has negative optical power.

[0006] According to an exemplary embodiment of this application, the radius of curvature R13 of the first side surface of the seventh lens and the effective focal length F of the optical lens satisfy: 0 <R13 / F≤5。

[0007] According to an exemplary embodiment of this application, the radius of curvature R14 of the second side surface of the seventh lens and the effective focal length F of the optical lens satisfy: 0 <R14 / F≤1。

[0008] According to an exemplary embodiment of this application, the axial distance d23 from the second side surface of the second lens to the first side surface of the third lens, the radius of curvature R3 of the first side surface of the second lens, the effective focal length F of the optical lens, and the total optical length TTL of the optical lens satisfy: -0.3≤(d23×R3) / (F×TTL)<0.

[0009] According to an exemplary embodiment of this application, the effective focal length F of the optical lens, the focal length F6 of the sixth lens, and the focal length F7 of the seventh lens satisfy: 0 < |F / F6| ≤ 3.5 and 0 < |F / F7| ≤ 1.5.

[0010] According to an exemplary embodiment of this application, the radius of curvature R14 of the second side of the seventh lens and the center thickness d7 of the seventh lens satisfy: 0.1≤(R14+d7) / R13≤3.

[0011] According to an exemplary embodiment of this application, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy: 0 < |F6 / F7| ≤ 4.

[0012] According to an exemplary embodiment of this application, the 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: 1.2≤F / H≤2.

[0013] According to an exemplary embodiment of this application, the focal length F2 of the second lens, the center thickness d2 of the second lens, the center thickness d1 of the first lens, and the focal length F1 of the first lens satisfy: -0.9≤(F2×d2) / (d1×F1)≤-0.025.

[0014] According to an exemplary embodiment of this application, the second side surface of the second lens always satisfies the following condition from the edge of 1 / 2 full aperture to the center of the optical axis: L(D / 2) / n>L(D / 2) / (n+1); wherein, the aperture stop of the optical lens is located on the second side of the second lens, L(D / 2) / n is the length of the second side surface of the second lens at the nth part above the optical axis, parallel to the optical axis, and L(D / 2) / (n+1) is the length of the second side surface of the second lens at the (n+1)th part above the optical axis, parallel to the optical axis, from the aperture stop.

[0015] According to an exemplary embodiment of this application, the focal length F2 of the second lens and the effective focal length F of the optical lens satisfy: -3.5≤F2 / F≤-0.2.

[0016] According to an exemplary embodiment of this application, the lens thickness T(D / 2) / n at the nth portion above the optical axis of the seventh lens and the lens thickness T(D / 2) / (n+1) at the (n+1)th portion above the optical axis of the seventh lens satisfy: 0.8≤T(D / 2) / n÷T(D / 2) / (n+1)≤1.2.

[0017] According to an exemplary embodiment of the present application, the first side surface of the seventh lens satisfies: Sag(D / 2) / n > Sag(D / 2) / (n + 1), and the second side surface of the seventh lens satisfies: Sag(D / 2) / n < Sag(D / 2) / (n + 1); where Sag(D / 2) / n is the sagitta at one nth of the part above the optical axis of the seventh lens, and Sag(D / 2) / (n + 1) is the sagitta at one (n + 1)th of the part above the optical axis of the seventh lens.

[0018] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following relational expressions: 0.2 ≤ BFL / R14 ≤ 0.95, -1.5 ≤ F2 / F3 < 0, 0 < d67 / TTL ≤ 0.195, 0.04 ≤ D / H / F ≤ 0.15, 0.1 ≤ R1 / TTL ≤ 1.5, 50 ≤ (FOV × F) / H ≤ 65, 4 ≤ TTL / H / θ ≤ 8, 0.1 ≤ F / ENPD / D ≤ 0.2, 0.5 ≤ (F × θ) / D ≤ 1, 1.75 ≤ d1 / d12 ≤ 6, 0.9 ≤ D1 / Dmax(L2~L7) ≤ 1.5, 0.3 ≤ F3 / F ≤ 8.5, 0.2 ≤ |F4 / F| ≤ 2.5, and 0.1 ≤ |F5 / F| ≤ 3.2; Where, BFL is the back focal length of the optical lens, R14 is the radius of curvature of the second side surface of the seventh lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, d67 is the axial distance from the second side surface of the sixth lens to the first side surface of the seventh lens, TTL is the total optical length of the optical lens, D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, H is the image height corresponding to the maximum field angle of the optical lens, F is the effective focal length of the optical lens, R1 is the radius of curvature of the first side surface of the first lens, FOV is the maximum field angle of the optical lens, θ is the radian value of the maximum field angle of the optical lens, ENPD is the entrance pupil diameter of the optical lens, d1 is the central thickness of the first lens, d12 is the axial distance from the second side surface of the first lens to the first side surface of the second lens, D1 is the maximum clear aperture of the second side surface of the first lens corresponding to the maximum field angle of the optical lens, Dmax(L2~L7) is the maximum clear aperture from the second lens to the seventh lens corresponding to the maximum field angle of the optical lens, F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following conditional expressions: 2.4 ≤ d1 / d2 ≤ 6, 0.95 ≤ F1 / F ≤ 2.5, 0.22 ≤ BFL / R14 ≤ 0.8, 0.1 ≤ |F / F7| ≤ 3.2, 0.005 ≤ |F / F7| ≤ 1.25, 0.45 ≤ (d4 + d5 + d6) / F ≤ 0.8, 0.25 ≤ R13 / F ≤ 4, 0.2 ≤ R14 / F ≤ 0.95, -0.27 ≤ (d23 × R3) / (F × TTL) ≤ -0.01, 0.3 ≤ d7 / ET7 ≤ 1.25, 0.12 ≤ (R14 + d7) / R13 ≤ 2.5, 0.01 ≤ |F6 / F7| ≤ 3.5, 1.4 ≤ F / H ≤ 2, -0.75 ≤ (F2 × d2) / (d1 × F1) ≤ -0.035, -3 ≤ F2 / F ≤ -0.35, -1.2 ≤ F2 / F3 ≤ -0.15, 0 < d67 / TTL ≤ 0.175, 0.06 ≤ D / H / F ≤ 0.12, 0.2 ≤ R1 / TTL ≤ 1.2, 52 ≤ (FOV × F) / H ≤ 60, 4.5 ≤ TTL / H / θ ≤ 7, 0.12 ≤ F / ENPD / D ≤ 0.175, 0.65 ≤ (F × θ) / D ≤ 0.95, 2 ≤ d1 / d12 ≤ 5.5, 1 ≤ D1 / Dmax(L2~L7) ≤ 1.25, 0.45 ≤ F3 / F ≤ 7.5, 0.3 ≤ |F4 / F| ≤ 2 and 0.25 ≤ |F5 / F| ≤ 2.8; Wherein, d1 is the center thickness of the first lens, d2 is the center thickness of the second lens, F1 is the focal length of the first lens, F is the effective focal length of the optical lens, BFL is the back focal length of the optical lens, R14 is the radius of curvature of the second side surface of the seventh lens, F7 is the focal length of the seventh lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, d6 is the center thickness of the sixth lens, R13 is the radius of curvature of the first side surface of the seventh lens, d23 is the axial distance from the second side surface of the second lens to the first side surface of the third lens, R3 is the radius of curvature of the first side surface of the second lens, TTL is the total optical length of the optical lens, d7 is the center thickness of the seventh lens, ET7 is the lens edge thickness of the seventh lens, F6 is the focal length of the sixth lens, and H is the image value corresponding to the maximum field of view of the optical lens. High, F2 is the focal length of the second lens, F3 is the focal length of the third lens, d67 is the axial distance from the second side of the sixth lens to the first side of the seventh lens, D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, R1 is the radius of curvature of the first side of the first lens, FOV is the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, ENPD is the entrance pupil diameter of the optical lens, d12 is the axial distance from the second side of the first lens to the first side of the second lens, D1 is the maximum aperture of the second side of the first lens corresponding to the maximum field of view of the optical lens, Dmax(L2~L7) is the maximum aperture of the second lens to the seventh lens corresponding to the maximum field of view of the optical lens, F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens.

[0019] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following conditions: 2.4874 ≤ d1 / d2 ≤ 5.4286, 1.0217 ≤ F1 / F ≤ 2.3240, 0.2473 ≤ BFL / R14 ≤ 0.7548, 0.1967 ≤ |F / F7| ≤ 2.8429, 0.0135 ≤ |F / F7| ≤ 1.0266, 0.4866 ≤ (d4 + d5 + d6) / F ≤ 0.7517, 0.4735 ≤ R13 / F ≤ 3.2789, 0.3869 ≤ R14 / F ≤ 0.8185, -0.2330 ≤ (d23 × R3) / (F × TTL) ≤ -0.0286, 0.4156 ≤ d7 / ET7 ≤ 1.1334, 0.1627 ≤ (R14 + d7) / R13 ≤ 1.9913, 0.0218 ≤ |F6 / F7| ≤ 2.6955, 1.5667 ≤ F / H ≤ 1.7700, -0.5802 ≤ (F2 × d2) / (d1 × F1) ≤ -0.0692, -2.7946 ≤ F2 / F ≤ -0.6208, -0.9937 ≤ F2 / F3 ≤ -0.3679, 0.0030 ≤ d67 / TTL ≤ 0.1493, 0.0725 ≤ D / H / F ≤ 0.0903, 0.3924 ≤ R1 / TTL ≤ 0.8627, 55.0219 ≤ (FOV × F) / H ≤ 56.7209, 5.2467 ≤ TTL / H / θ ≤ 6.2469, 0.1340 ≤ F / ENPD / D ≤ 0.1519, 0.7369 ≤ (F × θ) / D ≤ 0.8483, 2.2748 ≤ d1 / d12 ≤ 4.9214, 1.1068 ≤ D1 / Dmax(L2~L7) ≤ 1.2273, 0.6247 ≤ F3 / F ≤ 6.6328, 0.4489 ≤ |F4 / F| ≤ 1.7844, and 0.4049 ≤ |F5 / F| ≤ 2.5345; Wherein, d1 is the center thickness of the first lens, d2 is the center thickness of the second lens, F1 is the focal length of the first lens, F is the effective focal length of the optical lens, BFL is the back focal length of the optical lens, R14 is the radius of curvature of the second side surface of the seventh lens, F7 is the focal length of the seventh lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, d6 is the center thickness of the sixth lens, R13 is the radius of curvature of the first side surface of the seventh lens, d23 is the axial distance from the second side surface of the second lens to the first side surface of the third lens, R3 is the radius of curvature of the first side surface of the second lens, TTL is the total optical length of the optical lens, d7 is the center thickness of the seventh lens, ET7 is the lens edge thickness of the seventh lens, F6 is the focal length of the sixth lens, and H is the image value corresponding to the maximum field of view of the optical lens. High, F2 is the focal length of the second lens, F3 is the focal length of the third lens, d67 is the axial distance from the second side of the sixth lens to the first side of the seventh lens, D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, R1 is the radius of curvature of the first side of the first lens, FOV is the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, ENPD is the entrance pupil diameter of the optical lens, d12 is the axial distance from the second side of the first lens to the first side of the second lens, D1 is the maximum aperture of the second side of the first lens corresponding to the maximum field of view of the optical lens, Dmax(L2~L7) is the maximum aperture of the second lens to the seventh lens corresponding to the maximum field of view of the optical lens, F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens.

[0020] A second aspect of this application provides an electronic device, including the aforementioned optical lens; and at least one of an imaging element and 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 light source is located on a second side of the optical lens, and the light emitted by the light source is projected onto a first side of the optical lens after passing through the optical lens, forming an image or an illuminated area on the first side of the optical lens.

[0021] The optical lens according to the embodiments of this application employs seven lenses with optical power. The first lens has positive optical power and its first side surface is convex; the second lens has negative optical power and its first side surface is concave; the third lens has positive optical power; the fourth, fifth, and sixth lenses have optical power; and the seventh lens has optical power, with its first side surface being convex and its second side surface being concave. The first lens having positive optical power and a convex first side surface design helps to collect as much light as possible incident on the lens, increasing the system's light transmission. The convex design also helps water droplets slide off, preventing condensation and ensuring it doesn't affect lens imaging. By controlling the relationship between the focal length of the first lens and the effective focal length of the optical lens, i.e., 0.8 ≤ F1 / F ≤ 2.8, it is beneficial to converge light into the optical system, increasing the lens's light transmission. The diverging light rays exiting the first lens enter the second lens. The first side of the second lens is concave, which corrects the light rays and reduces aberrations such as spherical aberration and field curvature introduced by the first lens. Simultaneously, the light becomes relatively smoother, reducing sensitivity. By controlling the relationship between the center thicknesses of the first and second lenses (2.2 ≤ d1 / d2 ≤ 7), the thickness ratio of the first and second lenses can be controlled, significantly improving aberrations of the incident light rays, especially spherical aberration and field curvature, thus fully utilizing the structural advantages and improving resolution. The light rays exiting the second lens enter the third lens, which has positive optical power and converges the light rays exiting the second lens. The light rays emitted from the third lens pass through the fourth, fifth, and sixth lenses in sequence. By controlling the relationship between the center thickness of the fourth, fifth, and sixth lenses and the effective focal length of the optical lens, i.e., 0.35≤(d4+d5+d6) / F≤0.9, the thickness of the fourth, fifth, and sixth lenses at the rear of the system can be controlled. This allows the light rays to travel a longer distance with a gentle converging trend, which is beneficial for aberration correction and sensitivity reduction. The light rays emitted from the sixth lens enter the seventh lens. The convex surface of the first side of the seventh lens is mainly responsible for central convergence, bringing the light rays towards the optical axis, laying the foundation for clear imaging. The concave surface of the second side of the seventh lens suppresses spherical aberration and field curvature caused by the convex surface, reduces light reflection loss, and improves sharpness and uniformity. In addition, by controlling the relationship between the center thickness and the edge thickness of the seventh lens, i.e., 0.2≤d7 / ET7≤1.5, the distribution of light rays from the center and the periphery can be effectively controlled, improving image quality and enhancing imaging quality. At the same time, when the seventh lens has a convex-concave shape, aspherical surfaces can be superimposed (e.g., plasticizing to save costs) to further improve resolution. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Figure 1 as well as Figures 3-11Schematic diagrams of the optical lenses according to embodiments 1-10 of this application are shown respectively; Figure 2A The modulation transfer function (MTF) curve of the optical lens according to Embodiment 1 of this application is shown. Figure 2B A schematic diagram of the distortion of an optical lens according to Embodiment 1 of this application is shown; Figures 12A-12D A schematic diagram showing the markings of L(D / 2) / n, L(D / 2) / (n+1), T(D / 2) / n, T(D / 2) / (n+1), Sag(D / 2) / n and Sag(D / 2) / (n+1) in Embodiment 1 of this application is shown. Detailed Implementation

[0023] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0024] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0025] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0026] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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.

[0027] It should also be understood that the terms "comprising," "including," 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. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0028] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense, unless expressly so specified herein.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] The features, principles and other aspects of this application are described in detail below.

[0031] An optical lens according to an exemplary embodiment of this application may include, for example, seven lenses with 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 sequentially from the first side to the second side along the optical axis.

[0032] In an exemplary embodiment, the optical lens provided in this application can be used as a light receiving lens or a light emitting lens, wherein: the light receiving lens is generally used to collect light from the object-side space, and the collected light is used to form detection information, including but not limited to imaging, laser point clouds, etc.; the light emitting lens is generally used to transmit light from the light emitting unit to the object-side space, and the light transmitted to the object-side space can be divided into projection light for forming a projection image or detection light for detecting target information, etc., according to the function of the light.

[0033] It is understood that when the optical lens provided in this application is used as a light-receiving lens such as a camera lens, a lidar receiver lens, a microscope lens, or a telescope lens, the term "first side" as used herein may refer to the object side, and "second side" may refer to the image side (such as the side where a photoelectric sensor or retina is located). That is, light from the object side can, for example, form an image on the image side. A camera lens may be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc. When the optical lens provided in this application is used as a light-emitting lens such as a projection lens or a lidar transmitter lens, the term "first side" as used herein may refer to the object side, and "second side" may refer to the light source side.

[0034] In some possible implementations, the optical lens provided in this application can also simultaneously perform both light receiving and light transmitting functions. For example, the optical lens provided in this application is used in a lidar system with shared light and light paths, where the optical lens simultaneously performs the functions of emitting laser light and receiving radar echo beams. As another example, the optical lens provided in this application is used in a system integrating optical communication and radar, where the optical lens simultaneously performs the functions of emitting modulated optical signals and receiving radar echo beams.

[0035] In an exemplary embodiment, the first lens may have positive optical power, and its first side may be, for example, convex, and its second side may be, for example, concave. Positive optical power enables light convergence, the convex surface increases light transmission and prevents water droplets from condensing; the concave surface, in conjunction with positive optical power, suppresses distortion, allowing light to be transmitted smoothly backward, while the combination of convex and concave surfaces reduces the overall length of the mechanism, adapting to module requirements.

[0036] In an exemplary embodiment, the first lens may have positive optical power, and its first side may be, for example, convex, and its second side may be, for example, convex. The convex shape is conducive to secondary convergence and compression of light, and is more conducive to miniaturization.

[0037] In an exemplary embodiment, the second lens may have negative optical power, and its first side surface may be, for example, concave, and its second side surface may be, for example, concave. The negative optical power specifically corrects aberrations such as spherical aberration and field curvature caused by the first lens (positive optical power). The double-concave design further smooths light, reducing the system's sensitivity to assembly and the environment, forming a "positive-negative" complementary relationship with the positive optical power of the front lens. In an exemplary embodiment, the second lens may have negative optical power, and its first side surface may be, for example, concave, and its second side surface may be, for example, convex. The negative optical power first corrects the residual aberrations of the front lens group (positive optical power) through the concave surface, and then the convex surface assists in converging light, balancing the divergent characteristics of the negative optical power, and synergistically optimizing image quality with the positive optical power of the first lens. In an exemplary embodiment, the third lens may have positive optical power, and its first side may be, for example, convex. The positive optical power receives the smooth light from the second lens (negative optical power). The double convex design gathers the front group of light, reduces field curvature and light height, corrects coma, and forms a "positive-negative-positive" high-resolution core structure, which not only strengthens the focal power matching, but also helps with miniaturization and cost control.

[0038] In an exemplary embodiment, the third lens may have positive optical power, with its first side surface being, for example, concave and its second side surface being, for example, convex. The positive optical power, through the concave surface, accommodates the emission characteristics of the second lens (negative optical power), correcting spherical aberration, field curvature, and increasing illuminance; the convex surface controls light convergence, shares the system's thermal compensation burden, and forms a stable optical power balance with the preceding negative optical power. In an exemplary embodiment, the third lens may have positive optical power, with its first side surface being, for example, convex and its second side surface being, for example, concave. The positive optical power, through the convex surface, contracts the light that may diverge from the second lens (negative optical power), reducing the lens aperture; the concave surface, in conjunction with the positive optical power, allows light to enter the rear group smoothly, reducing system sensitivity and maintaining the rationality of the "positive-negative" optical power transition. In an exemplary embodiment, the fourth lens may have positive optical power, with its first side surface being, for example, convex and its second side surface being, for example, convex. Receiving light from the third lens, the biconvex design further converges the light, reducing the radial dimension and rear group volume, thus sharing the system's optical power. At the same time, as a cemented positive lens, it can be paired with subsequent possible negative power lenses to reduce chromatic aberration.

[0039] In an exemplary embodiment, the fourth lens may have positive optical power, and its first side may be, for example, convex, and its second side may be, for example, concave. The positive optical power collects the diverging light from the third lens through the convex surface, while the concave surface moderately diverges to increase the amount of emitted light and illuminance. This not only compensates for the insufficient converging of the previous positive optical power but also reduces the light deflection angle and lowers the sensitivity of the back group.

[0040] In an exemplary embodiment, the fourth lens may have negative optical power, and its first side may be, for example, concave, and its second side may be, for example, concave. The negative optical power specifically corrects the cumulative aberrations of the first three lenses (primarily positive). The double-concave design, combined with a cemented positive lens, reduces chromatic aberration and spherical aberration through a "positive-negative" combination, significantly improving resolving power. In an exemplary embodiment, the fifth lens may have positive optical power, and its first side may be, for example, convex, and its second side may be, for example, convex. As a cemented positive lens, the positive optical power complements the fourth lens, reducing chromatic aberration while lowering the light beam height, achieving miniaturization and cost reduction, and enhancing the balance of the system's optical power distribution. In an exemplary embodiment, the fifth lens may have positive optical power, and its first side may be, for example, convex, and its second side may be, for example, concave. The positive optical power adapts to the cemented structure of the fourth lens through a convex surface, while the concave surface reduces light refraction; by utilizing a combination of high and low Abbe numbers, it works in conjunction with the preceding lenses to reduce chromatic aberration and axial dimensions, lowering costs.

[0041] In an exemplary embodiment, the fifth lens may have positive optical power, and its first side surface may be, for example, concave, and its second side surface may be, for example, convex. Used as a positive film for adhesive bonding, the concave surface collects light and corrects aberrations, improving resolution, while the convex surface appropriately lifts the light, ensuring that the light effectively falls into the sensor.

[0042] In an exemplary embodiment, the fifth lens may have negative optical power, and its first side may be, for example, concave, and its second side may be, for example, concave. The negative optical power forms a cemented combination with the fourth lens, and the double-concave design shortens the axial length, diverges light rays, enlarges the image plane, balances the excessive convergence of the previous positive optical power, and optimizes the aberration distribution.

[0043] In an exemplary embodiment, the fifth lens may have negative optical power, with its first side surface being, for example, concave and its second side surface being, for example, convex. The negative optical power reduces the axial dimension and optical path length through the concave surface, adapting to the emission characteristics of the fourth lens; the convex surface lowers the height of the light incident on the sixth lens, controlling the rear aperture and forming a power buffer with the positive optical power of the preceding stage. In the exemplary embodiment, the fifth lens may have negative optical power, with its first side surface being, for example, convex and its second side surface being, for example, concave. The fifth lens has negative optical power, the convex surface collects the diverging light from the fourth lens, and the concave surface increases the amount of emitted light, thus correcting the converging deviation of the positive optical power of the preceding stage and enhancing the system illumination.

[0044] In an exemplary embodiment, the sixth lens may have positive optical power, and its first side surface may be, for example, convex, and its second side surface may be, for example, convex. The first side surface of the sixth lens is convex, which adjusts the height of the rear group of rays, reduces the optical power pressure on the seventh lens, and, in conjunction with the seventh lens, ensures that the light falls accurately into the sensor; while the second side surface of the sixth lens is convex, which can converge the light, reduce the difference in aberrations between the center and the periphery, and improve resolution.

[0045] In an exemplary embodiment, the sixth lens may have positive optical power, and its first side surface may be, for example, concave, and its second side surface may be, for example, convex. The first side surface of the sixth lens is concave, and the second side surface is convex, which mainly serves to compensate for the optical power required for high resolution, and can also reduce system sensitivity.

[0046] In an exemplary embodiment, the sixth lens may have positive optical power, and its first side may be, for example, convex, and its second side may be, for example, concave. The positive optical power receives the light from the fifth lens, the biconvex design adjusts the height of the rear group of rays, shares the optical power pressure of the seventh lens, converges the light to balance the aberrations in the central and peripheral fields of view, and works in conjunction with the previous lens power to improve resolution.

[0047] In an exemplary embodiment, the sixth lens may have negative optical power, and its first side surface may be, for example, concave, and its second side surface may be, for example, concave. The biconcave design of the sixth lens corrects the residual aberrations of the previous positive optical power and balances the imaging quality of the central and peripheral fields of view.

[0048] In an exemplary embodiment, the sixth lens may have negative optical power, and its first side may be, for example, concave, and its second side may be, for example, convex. This, combined with the positive optical power of the preceding lens, reduces chromatic aberration; the concave surface corrects residual aberration, and the convex surface adapts to the aspherical characteristics of the seventh lens, improving central image quality.

[0049] In an exemplary embodiment, the sixth lens may have negative optical power, with its first side surface being, for example, convex and its second side surface being, for example, concave. The negative optical power allows the convex surface to collect light from the fifth lens, reducing the lens size; the concave surface facilitates light transmission to fit the image plane, sharing the system's optical power and allowing the seventh lens to more flexibly control the light, optimizing the overall optical power configuration. In an exemplary embodiment, the seventh lens may have positive or negative optical power, with its first side surface being, for example, convex and its second side surface being, for example, concave. The convex surface of the first side of the seventh lens is primarily responsible for central convergence, drawing light towards the optical axis, laying the foundation for clear imaging; while the concave surface of the second side of the seventh lens suppresses spherical aberration and field curvature caused by the convex surface, reducing light reflection loss and improving image sharpness and uniformity.

[0050] In an exemplary embodiment, the optical lens may further include an aperture stop, which may be disposed, for example, between the second lens and the third lens or between the third lens and the fourth lens. By disposing an aperture stop between the second lens and the third lens or between the third lens and the fourth lens, it is beneficial to effectively converge the light entering the optical system, reduce the lens aperture at the rear end of the optical system, and decrease the system's assembly sensitivity. It should be understood that disposing the aperture stop between the second lens and the third lens or between the third lens and the fourth lens is merely exemplary, and this application does not impose specific limitations on it. The aperture stop may be disposed in other positions as needed.

[0051] In an exemplary embodiment, the fourth lens is cemented with the fifth lens or the fifth lens is cemented with the sixth lens. The two cemented lenses have opposite optical powers, which allows light to smoothly transition to the rear lens. Furthermore, double cementing offers the following advantages: ① It reduces the air gap between the two lenses, thus reducing the overall system length; ② The two lenses are dispersive and complementary, which helps reduce chromatic aberration and improve image quality; ③ It reduces the number of assembly components between the two lenses, reducing processes and lowering costs; ④ It can further reduce field curvature and correct off-axis point aberrations of the system; ⑤ Reasonable focal length allocation helps achieve thermal compensation and obtain good temperature performance.

[0052] In an exemplary embodiment, both sides of the seventh lens are aspherical and may have inflection points, which is beneficial for correcting aberrations and improving imaging quality.

[0053] In an exemplary embodiment, the optical lens may further include a filter located between the seventh lens and the image plane to filter light of different wavelengths. The optical lens may also, as needed, provide a protective glass between the filter and the image plane to prevent damage to internal components (e.g., chips) of the optical lens.

[0054] 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 photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS).

[0055] In an exemplary embodiment, the center thickness d1 of the first lens and the center thickness d2 of the second lens can satisfy: 2.2 ≤ d1 / d2 ≤ 7. Preferably, 2.4 ≤ d1 / d2 ≤ 6. Further, 2.4874 ≤ d1 / d2 ≤ 5.4286. Controlling the thickness ratio of the first lens and the second lens can greatly improve the aberrations of the incident light, especially spherical aberration and field curvature, thereby fully utilizing the advantages of the architecture and improving resolution.

[0056] In an exemplary embodiment, the focal length F1 of the first lens and the effective focal length F of the optical lens can satisfy: 0.8 ≤ F1 / F ≤ 2.8. Preferably, 0.95 ≤ F1 / F ≤ 2.5. Further, 1.0217 ≤ F1 / F ≤ 2.3240. The first lens is a positive lens, which is beneficial for converging light into the optical system and increasing the light transmission of the lens.

[0057] In an exemplary embodiment, the back focal length BFL of the optical lens and the radius of curvature R14 of the second side surface of the seventh lens may satisfy: 0.2 ≤ BFL / R14 ≤ 0.95. Preferably, 0.22 ≤ BFL / R14 ≤ 0.8. Further, 0.2473 ≤ BFL / R14 ≤ 0.7548. By controlling the back focal length of the lens and the radius of curvature of the second side surface of the seventh lens, the light can diverge gently to the image plane when exiting the seventh lens, achieving the required CRA angle and improving the imaging quality.

[0058] In an exemplary embodiment, the effective focal length F of the optical lens and the focal length F6 of the sixth lens may satisfy: 0 < |F / F6| ≤ 3.5. Preferably, 0.1 < |F / F6| ≤ 3.2. Further, 0.1967 < |F / F6| ≤ 2.8429.

[0059] In an exemplary embodiment, the effective focal length F of the optical lens and the focal length F7 of the seventh lens may satisfy: 0 < |F / F7| ≤ 1.5. Preferably, 0.005 ≤ |F / F7| ≤ 1.25. Further, 0.0135 ≤ |F / F7| ≤ 1.0266. By controlling the ratio of the focal length of the seventh lens to the focal length of the entire system, the light can transition gently to the image plane in the seventh lens, correcting aberrations and improving resolution, and obtaining the desired CRA. At the same time, when the seventh lens has a convex-concave surface type, aspheric surfaces (such as plasticization to save costs) can be superimposed to further improve resolution.

[0060] In an exemplary embodiment, the central thickness d4 of the fourth lens, the central thickness d5 of the fifth lens, the central thickness d6 of the sixth lens, and the effective focal length of the optical lens may satisfy: 0.35 ≤ (d4 + d5 + d6) / F ≤ 0.9. Preferably, 0.45 ≤ (d4 + d5 + d6) / F ≤ 0.8. Further, 0.4866 ≤ (d4 + d5 + d6) / F ≤ 0.7517. By controlling the thicknesses of the three lenses, namely the fourth lens, the fifth lens, and the sixth lens, at the rear of the system, the light can converge gently over a longer distance, facilitating the correction of aberrations and the reduction of sensitivity.

[0061] In an exemplary embodiment, the radius of curvature R13 of the first side surface of the seventh lens and the effective focal length F of the optical lens satisfy: 0 < R13 / F ≤ 5. Preferably, 0.25 ≤ R13 / F ≤ 4. Further, 0.4735 ≤ R13 / F ≤ 3.2789. Controlling the R value of the first side surface of the seventh lens can converge the central light rays and improve the central resolution.

[0062] In an exemplary embodiment, the radius of curvature R14 of the second side surface of the seventh lens and the effective focal length F of the optical lens satisfy: 0 < R14 / F ≤ 1. Preferably, 0.2 ≤ R14 / F ≤ 0.95. Further, 0.3869 ≤ R14 / F ≤ 0.8185. Ensuring that the R value of the second side surface of the seventh lens is within a certain range can increase the back focal length and leave an assembly space.

[0063] In an exemplary embodiment, the on-axis distance d23 from the second side surface of the second lens to the first side surface of the third lens, the radius of curvature R3 of the first side surface of the second lens, the effective focal length F of the optical lens, and the overall optical length TTL of the optical lens satisfy: -0.3 ≤ (d23 × R3) / (F × TTL) < 0. Preferably, -0.27 ≤ (d23 × R3) / (F × TTL) ≤ -0.01. Further, -0.2330 ≤ (d23 × R3) / (F × TTL) ≤ -0.0286. Controlling the first side surface of the second lens to be concave and the air gap between the second lens and the third lens can effectively diverge the light rays when the light rays are incident on the second lens and pass through the second lens on the basis of ensuring miniaturization, realizing long-focus application imaging of the optical system.

[0064] In an exemplary embodiment, the central thickness d7 of the seventh lens and the edge thickness ET7 of the seventh lens satisfy: 0.2 ≤ d7 / ET7 ≤ 1.5. Preferably, 0.3 ≤ d7 / ET7 ≤ 1.25. Further, 0.4156 ≤ d7 / ET7 ≤ 1.1334. Controlling the ratio of the edge thickness to the central thickness of the seventh lens can effectively regulate the distribution of light rays in the center and periphery, improve the image quality, and enhance the imaging quality.

[0065] In an exemplary embodiment, the radius of curvature R14 of the second side surface of the seventh lens and the central thickness d7 of the seventh lens satisfy: 0.1 ≤ (R14 + d7) / R13 ≤ 3. Preferably, 0.12 ≤ (R14 + d7) / R13 ≤ 2.5. Further, 0.1627 ≤ (R14 + d7) / R13 ≤ 1.9913. Controlling the R value and the ratio of the central thickness of the seventh lens can effectively regulate the light rays in the center and periphery, improve the image quality and balance the CRA at the same time.

[0066] In an exemplary embodiment, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy: 0 < |F6 / F7| ≤ 4. Preferably, 0.01 ≤ |F6 / F7| ≤ 3.5. Further, 0.0218 ≤ |F6 / F7| ≤ 2.6955. Controlling the ratio of the focal lengths of the sixth and seventh lenses within a certain range can give full play to the structural advantages, reasonably distribute the optical power, make the light rays smoother, and reduce the sensitivity.

[0067] In an exemplary embodiment, the 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 the following condition: 1.2 ≤ F / H ≤ 2. Preferably, 1.4 ≤ F / H ≤ 2. Further, 1.5667 ≤ F / H ≤ 1.7700. Controlling the focal length and image height within a certain range is beneficial for improving resolution.

[0068] In an exemplary embodiment, the focal length F2 of the second lens, the center thickness d2 of the second lens, the center thickness d1 of the first lens, and the focal length F1 of the first lens satisfy: -0.9 ≤ (F2 × d2) / (d1 × F1) ≤ -0.025. Preferably, -0.75 ≤ (F2 × d2) / (d1 × F1) ≤ -0.035. Further, -0.5802 ≤ (F2 × d2) / (d1 × F1) ≤ -0.0692. Controlling the focal length and thickness of the first and second lenses allows the front end to collect and effectively diverge light with a smaller distance and volume, which is beneficial for miniaturization; it can also greatly improve the aberration of the incident light and enhance resolution.

[0069] Please refer to Figure 12A As shown, in an exemplary embodiment, the second side surface of the second lens, from the edge of half the full aperture to the center of the optical axis, always satisfies: L(D / 2) / n > L(D / 2) / (n+1); where L(D / 2) / n is the length of the second side surface of the second lens at a point n parts above the optical axis, parallel to the optical axis, from the aperture stop, and L(D / 2) / (n+1) is the length of the second side surface of the second lens at a point (n+1) parts above the optical axis, parallel to the optical axis, from the aperture stop. The second lens is a glass spherical lens, and the control over the distance between the second lens and the aperture stop is uniform, allowing the light rays exiting the second lens to uniformly regulate the trajectory of light rays in each field of view. Even with changes in ambient temperature, the trajectory of light rays in each field of view remains balanced, achieving stable image resolution.

[0070] In an exemplary embodiment, the focal length F2 of the second lens and the effective focal length F of the optical lens satisfy: -3.5 ≤ F2 / F ≤ -0.2. Preferably, -3 ≤ F2 / F ≤ -0.35. Further, -2.7946 ≤ F2 / F ≤ -0.6208. The second lens diverges the light from the first lens, modulates peripheral light aberrations, and improves resolution while ensuring high light transmission.

[0071] In an exemplary embodiment, the focal length F2 of the second lens and the focal length F3 of the third lens satisfy: -1.5 ≤ F2 / F3 < 0. Preferably, -1.2 ≤ F2 / F3 ≤ -0.15. Further, -0.9937 ≤ F2 / F3 ≤ -0.3679. Controlling the focal lengths of these two adjacent lenses, the second and third lenses, to have opposite signs and similar values ​​helps to ensure smooth light transition and balance aberrations.

[0072] In an exemplary embodiment, the on-axis distance d67 from the second side surface of the sixth lens to the first side surface of the seventh lens and the total optical length TTL of the optical lens may satisfy: 0 < d67 / TTL ≤ 0.195. Preferably, 0 < d67 / TTL ≤ 0.175. Further, 0.0030 ≤ d67 / TTL ≤ 1.1493. By controlling the distance between the sixth and seventh lenses, the light reflection path can be effectively regulated, the front and back landing points of ghost images on the image plane can be improved, and the ghost images can be weakened.

[0073] In an exemplary embodiment, the maximum clear aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the effective focal length F of the optical lens may satisfy: 0.04 ≤ D / H / F ≤ 0.15. Preferably, 0.06 ≤ D / H / F ≤ 0.12. Further, 0.0725 ≤ D / H / F ≤ 0.0903. Under the condition of a fixed focal length, it can provide the optical lens with the characteristics of a large target surface and a small aperture.

[0074] In an exemplary embodiment, the radius of curvature R1 of the first side surface of the first lens and the total optical length TTL of the optical lens may satisfy: 0.1 ≤ R1 / TTL ≤ 1.5. Preferably, 0.2 ≤ R1 / TTL ≤ 1.2. Further, 0.3924 ≤ R1 / TTL ≤ 0.8627. By controlling the ratio of R1 to TTL, the object side surface of the first lens is set to have a relatively small radius of curvature, the angles of the rear group of light rays and the reflected light rays on the object side surface of the first lens are controlled, the ghost image reflection path is improved, the ghost image energy is reduced, and weak ghost images are achieved.

[0075] In an exemplary embodiment, the maximum field angle FOV of the optical lens, the 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: 50 ≤ (FOV × F) / H ≤ 65. Preferably, 52 ≤ (FOV × F) / H ≤ 60. Further, 55.0219 ≤ (FOV × F) / H ≤ 56.7209. With the same image height, high-resolution for long focal length and large angle is achieved.

[0076] In an exemplary embodiment, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the radian value θ of the maximum field angle of the optical lens may satisfy: 4 ≤ TTL / H / θ ≤ 8. Preferably, 4.5 ≤ TTL / H / θ ≤ 7. Further, 5.2467 ≤ TTL / H / θ ≤ 6.2469. In the case of the same imaging surface and the same image height, the length of the lens can be effectively limited, which is beneficial to the miniaturization of the lens.

[0077] In an exemplary embodiment, the effective focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens can satisfy: 0.1 ≤ F / ENPD / D ≤ 0.2. Preferably, 0.12 ≤ F / ENPD / D ≤ 0.175. Further, 0.1340 ≤ F / ENPD / D ≤ 0.1519. This ensures a small aperture while maintaining high light transmission, achieving lens miniaturization.

[0078] In an exemplary embodiment, the effective focal length F of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens can satisfy: 0.5 ≤ (F×θ) / D ≤ 1. Preferably, 0.65 ≤ (F×θ) / D ≤ 0.95. Further, 0.7369 ≤ (F×θ) / D ≤ 0.8483. Under the condition of the same imaging plane and the same image height, the length of the lens can be effectively limited, which is beneficial to achieving lens miniaturization.

[0079] In an exemplary embodiment, the center thickness d1 of the first lens and the axial distance d12 between the second side surface of the first lens and the first side surface of the second lens can satisfy: 1.75 ≤ d1 / d12 ≤ 6. Preferably, 2 ≤ d1 / d12 ≤ 5.5. Further, 2.2748 ≤ d1 / d12 ≤ 4.9214. By controlling the air gap between the first and second lenses to be small, and the center thickness of the first lens to be relatively thick, light rays can reach the second lens quickly after being stably collected by the first lens, avoiding the introduction of excess stray light into the optical system and achieving high resolution.

[0080] In an exemplary embodiment, the maximum aperture D1 of the second side of the first lens corresponding to the maximum field of view of the optical lens and the maximum aperture Dmax (L2~L7) of the second to seventh lenses corresponding to the maximum field of view of the optical lens can satisfy: 0.9≤D1 / Dmax(L2~L7)≤1.5. Preferably, 1≤D1 / Dmax(L2~L7)≤1.25. Further, 1.1068≤D1 / Dmax(L2~L7)≤1.2273. By controlling the maximum aperture corresponding to the maximum field of view of the first side of the first lens and the maximum aperture max value corresponding to the maximum field of view of all lenses from the second to the seventh lens to be close, the entire system can meet the small aperture requirement, while the light height is basically close, avoiding stray light interference with resolution and improving imaging quality.

[0081] In an exemplary embodiment, the focal length F3 of the third lens and the effective focal length F of the optical lens may satisfy: 0.3 ≤ F3 / F ≤ 8.5. Preferably, 0.45 ≤ F3 / F ≤ 7.5. Further, 0.6247 ≤ F3 / F ≤ 6.6328. Effectively adjusting the focal length of the third lens is beneficial for cooperating with the front group of lenses and giving full play to the characteristics of high illuminance and low aberration of the architecture.

[0082] In an exemplary embodiment, the focal length F4 of the fourth lens and the effective focal length F of the optical lens may satisfy: 0.2 ≤ |F4 / F| ≤ 2.5. Preferably, 0.3 ≤ |F4 / F| ≤ 2. Further, 0.4489 ≤ |F4 / F| ≤ 1.7844. Controlling the ratio of the focal length of the fourth lens to the focal length of the entire system is beneficial for smoothly receiving the light rays emitted by the front positive third lens. The light rays are corrected for aberration here, improving the imaging quality.

[0083] In an exemplary embodiment, the focal length F5 of the fifth lens and the effective focal length F of the optical lens may satisfy: 0.1 ≤ |F5 / F| ≤ 3.2. Preferably, 0.25 ≤ |F5 / F| ≤ 2.8. Further, 0.4049 ≤ |F5 / F| ≤ 2.5345. Controlling the ratio of the focal length of the fifth lens to the focal length of the entire system is beneficial for the light rays to continue to converge smoothly, reach the image plane as soon as possible, compress the aperture, and achieve miniaturization.

[0084] Please refer to Figure 12B As shown, in an exemplary embodiment, the lens thickness T(D / 2) / n at the n-th part above the optical axis of the seventh lens and the lens thickness T(D / 2) / (n + 1) at the (n + 1)-th part above the optical axis of the seventh lens satisfy: 0.8 ≤ T(D / 2) / n ÷ T(D / 2) / (n + 1) ≤ 1.2. Controlling the uniform change of the overall shape thickness of the seventh lens is beneficial for regulating the optical path difference of the light rays passing through the seventh lens in each field of view, facilitating uniform imaging in each field of view, and overall high resolution. [[ID=1__3]]

[0085] Please combine Figure 12C and Figure 12D As shown, in an exemplary embodiment, the first side surface of the seventh lens satisfies: Sag(D / 2) / n > Sag(D / 2) / (n + 1), and the second side surface of the seventh lens satisfies: Sag(D / 2) / n < Sag(D / 2) / (n + 1); where Sag(D / 2) / n is the sagitta at the n-th part above the optical axis of the seventh lens, and Sag(D / 2) / (n + 1) is the sagitta at the (n + 1)-th part above the optical axis of the seventh lens. Controlling the monotonic change of the sagitta of the two side surfaces of the seventh lens as the aperture on both sides of the lens increases can effectively correct the light rays on both sides of the seventh lens for each duration, improving the imaging quality.

[0086] The optical lens according to the above embodiments of this application can employ multiple lenses, such as the seven lenses mentioned above. By rationally allocating the optical parameters of each lens, the optical lens achieves high resolution, high light transmittance, low sensitivity, long back focal length, miniaturization, telephoto capability, stable imaging, weak ghosting, and small aperture, and can be well matched with, for example, automotive chips. This optical lens exhibits excellent temperature performance, with minimal changes in imaging effect at high and low temperatures, stable image quality, low sensitivity, and low cost. Therefore, the optical lens according to the above embodiments of this application can better meet the requirements of, for example, automotive applications.

[0087] Those skilled in the art should understand that the total optical length (TTL) of the optical lens used above refers to the axial distance from the first side surface of the first lens to the imaging plane or image source plane; the back focal length (BFL) of the optical lens refers to the axial distance from the second side surface of the seventh lens to the imaging plane or image source plane; and the maximum field of view (FOV) of the optical lens is related to the image height (H), which refers to the field of view corresponding to the image height (H).

[0088] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although seven lenses are described as an example in the embodiment, the optical lens is not limited to including seven lenses. If desired, the optical lens may also include other numbers of lenses.

[0089] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings. It should be understood that the units for the radius of curvature and thickness / distance in the basic parameters of the optical lens are mm.

[0090] Example 1 The following is for reference Figure 1 The optical lens according to Embodiment 1 of this application is described.

[0091] like Figure 1 As shown, the optical lens, along the optical axis from the first side to the second side, 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. An aperture stop STO can be positioned between the second lens L2 and the third lens L3. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens.

[0092] The first lens L1 has positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave.

[0093] The second lens L2 has negative optical power, and its first side surface S3 is concave, and its second side surface S4 is concave.

[0094] The third lens L3 has positive optical power, and its first side surface S5 is convex, and its second side surface S6 is convex.

[0095] The fourth lens L4 has positive optical power, and its first side surface S7 is convex, and its second side surface S8 is convex.

[0096] The fifth lens L5 has negative optical power, and its first side surface S9 is concave, and its second side surface S10 is concave.

[0097] The sixth lens L6 has negative optical power, with its first side surface S11 being convex and its second side surface S12 being concave.

[0098] The seventh lens L7 has positive optical power, with its first side surface S13 being convex and its second side surface S14 being concave.

[0099] An image plane IMA is disposed on the second side of the optical lens. A filter IR and / or a protective glass CG are disposed between the seventh lens L7 and the image plane IMA. The filter IR has a first side and a second side, and the protective glass CG has a first side and a second side. In this embodiment, a protective glass CG is disposed between the seventh lens L7 and the image plane IMA. When the IMA is the imaging plane, light from the object passes through each surface sequentially and is finally imaged on the IMA. When the IMA is the image source plane, light from the IMA passes through each surface sequentially and is finally projected onto the object.

[0100] Table 1 shows the basic parameters of the optical lens of Example 1.

[0101] Table 1 In Embodiment 1, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces, and the surface shape of each aspherical surface can be defined using, but is not limited to, the following aspherical surface formula: (1) Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for the aspherical surfaces S12 and S13 in Example 1.

[0102] Table 2 from Figure 2AAs can be seen, the optical lens of Example 1 has an MTF peak value exceeding 0.7 at a spatial frequency of 119 lp / mm (119 line pairs / mm), achieving an imaging quality of eight megapixels. From Figure 2B As can be seen, the optical lens of Example 1 exhibits less edge distortion and a higher average angular resolution across all fields of view. Therefore, the optical lens provided in Example 1 has better imaging quality.

[0103] Example 2 The following is for reference Figure 3 Describes an optical lens according to Embodiment 2 of this application. For example... Figure 3 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the second side surface S2 of the first lens L1 is convex, the second side surface S10 of the fifth lens L5 is convex, and the seventh lens L7 has negative optical power.

[0104] Table 3 shows the basic parameters of the optical lens in Example 2.

[0105] Table 3 In Embodiment 2, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 4 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Embodiment 2.

[0106] Table 4 Example 3 The following is for reference Figure 4 Describes an optical lens according to Embodiment 3 of this application. For example... Figure 4 As shown, the main difference between this embodiment and embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the sixth lens L6 has positive optical power and the seventh lens has negative optical power.

[0107] Table 5 shows the basic parameters of the optical lens of Example 3.

[0108] Table 5 In Example 3, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 6 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 3.

[0109] Table 6 Example 4 The following is for reference Figure 5 Describes an optical lens according to Embodiment 4 of this application. For example... Figure 5 As shown, the main difference between this embodiment and embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the second side surface S8 of the fourth lens L4 is concave, the first side surface S9 of the fifth lens L5 is convex, the sixth lens L6 has positive optical power, and the first side surface S13 and the second side surface S14 of the seventh lens L7 have at least one inflection point.

[0110] Table 7 shows the basic parameters of the optical lens in Example 4.

[0111] Table 7 In Example 4, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 8 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 4.

[0112] Table 8 Example 5 The following is for reference Figure 6 Describes an optical lens according to Embodiment 5 of this application. For example... Figure 6 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the sixth lens L6 has positive optical power and the seventh lens L7 has negative optical power; the fourth lens L4 and the fifth lens L5 are not cemented together; the fifth lens L5 and the sixth lens L6 are cemented together; and the first side surface S13 and the second side surface S14 of the seventh lens L7 have at least one inflection point.

[0113] Table 9 shows the basic parameters of the optical lens of Example 5.

[0114] Table 9 In Example 5, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 10 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 5.

[0115] Table 10 Example 6 The following is for reference Figure 7 Describes an optical lens according to Embodiment 6 of this application. For example... Figure 7 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the second side surface S8 of the fourth lens L4 is concave; the fifth lens L5 has positive optical power; the first side surface S9 and the second side surface S10 of the fifth lens L5 are both convex; the first side surface S11 of the sixth lens L6 is concave; the fourth lens L4 and the fifth lens L5 are not cemented together; and the fifth lens L5 and the sixth lens L6 are cemented together.

[0116] Table 11 shows the basic parameters of the optical lens of Example 6.

[0117] Table 11 In Example 6, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 12 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 6.

[0118] Table 12 Example 7 The following is for reference Figure 8 Describes an optical lens according to Embodiment 7 of this application. For example... Figure 8 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the second side surface S6 of the third lens L3 is concave; the fourth lens L4 has negative optical power; the first side surface S7 and the second side surface S8 of the fourth lens L4 are both concave; the fifth lens L5 has positive optical power; the first side surface S9 and the second side surface S10 of the fifth lens L5 are both convex; the sixth lens L6 has positive optical power; the seventh lens L7 has negative optical power; and the first side surface S13 and the second side surface S14 of the seventh lens L7 have at least one inflection point.

[0119] Table 13 shows the basic parameters of the optical lens of Example 7.

[0120] Table 13 In Example 7, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 14 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 7.

[0121] Table 14 Example 8 The following is for reference Figure 9 Describes an optical lens according to Embodiment 8 of this application. For example... Figure 9 As shown, the main difference between this embodiment and embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the fourth lens L4 has negative optical power, the first side surface S7 and the second side surface S8 of the fourth lens L4 are both concave, the fifth lens L5 has positive optical power, the first side surface S9 of the fifth lens L5 is convex, the sixth lens L6 has positive optical power, and the first side surface S11 of the sixth lens L6 is concave and the second side surface S12 is convex.

[0122] Table 15 shows the basic parameters of the optical lens of Example 8.

[0123] Table 15 In Example 8, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 16 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 8.

[0124] Table 16 Example 9 The following is for reference Figure 10 Describes an optical lens according to Embodiment 9 of this application. For example... Figure 10 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the second lens L2 has negative optical power, the second side surface S4 of the second lens L2 is convex, the first side surface S5 of the third lens L3 is concave, the fourth lens L4 has negative optical power, the first side surface S7 and the second side surface S8 of the fourth lens L4 are both concave, the fifth lens L5 has positive optical power, the first side surface S9 and the second side surface S10 of the fifth lens L5 are both convex, the sixth lens L6 has positive optical power, the second side surface S12 of the sixth lens L6 is convex, and the seventh lens L7 has negative optical power.

[0125] Table 17 shows the basic parameters of the optical lens of Example 9.

[0126] Table 17 In Example 9, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 18 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 9.

[0127] Table 18 Example 10 The following is for reference Figure 11 Describes an optical lens according to Embodiment 10 of this application. For example... Figure 11 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the first side surface S5 of the third lens L3 is concave, the fifth lens L5 has positive optical power, the second side surface S10 of the fifth lens L5 is convex, the first side surface S11 of the sixth lens L6 is concave and the second side surface S12 is convex, the seventh lens L7 has negative optical power, the fourth lens L4 and the fifth lens L5 are not cemented, the fifth lens L5 and the sixth lens L6 are cemented, the first side surface S13 and the second side surface S14 of the seventh lens L7 each have at least one inflection point, and the aperture STO is located between the third lens L3 and the fourth lens L4.

[0128] Table 19 shows the basic parameters of the optical lens of Example 10.

[0129] Table 19 In Example 10, the first side surface S13 and the second side surface S14 of the seventh lens L7 are aspherical surfaces. Table 20 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S13 and S14 in Example 10.

[0130] In Examples 2-10, the MTF peak value of the center field of view of the optical lens at a spatial frequency of 119 lp / mm (119 line pairs / mm) all exceeded 0.7, which can achieve an imaging quality of eight megapixels.

[0131] Table 20 Table 21 lists the basic parameters of the optical lenses used in Examples 1-10, such as F, F1-F7, BFL, TTL, FOV, HFOV, ET7, ENPD, d1, d2, d4, d5, d6, d7, d12, d23, d67, R1, R3, R13, R14, H, θ, D, D1, Dmax (L2~L7). HFOV is the field of view angle of the horizontal field of view. The units for parameters HFOV, FOV, and θ in the table are °, while the units for other parameters are mm.

[0132] Table 21 In summary, the conditional expressions of each embodiment in Examples 1-10 satisfy the relationships shown in Table 22.

[0133] Table 22 This application also provides an electronic device including an optical lens as described in the exemplary embodiments above and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The imaging element is disposed on a second side of the optical lens, for example, on an imaging surface, and may be, for example, a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). Light from the first side is imaged on the second side after passing through the optical lens.

[0134] This application also provides an electronic device including an optical lens and a light source as described in the exemplary embodiments above, with the light source located on a second side of the optical lens. Light emitted from the light source is projected onto a first side of the optical lens after passing through it, forming an image or illuminating an area on the first side.

[0135] This application also provides an electronic device, including a first device and a second device. The first device may be, for example, a lidar transmitter, and the second device may be, for example, a lidar receiver. The first device may include an optical lens and a light source as described in the exemplary embodiments above. The light source is located on the second side of the optical lens, and the light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, forming an image or illuminating an area on the first side. The second device may include an optical lens as described in the exemplary embodiments above and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element is disposed on the second side of the optical lens (e.g., on an imaging surface), and the imaging element may be, for example, a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The light from the first side is imaged on the second side after passing through the optical lens.

[0136] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, Along the optical axis, from the first side to the second side, the following are included in sequence: A first lens with positive optical power has a convex first side surface. A second lens with negative optical power has a concave first side surface; A third lens with positive optical power; A fourth lens with optical power; A fifth lens with optical power; A sixth lens with optical power; The seventh lens with optical power has a convex first side and a concave second side. Among them, at least two convex surfaces exist in the fourth to sixth lenses, and the number of lenses with optical power in the optical lens is seven; The optical lens satisfies the following conditions: 2.2≤d1 / d2≤7, 0.8≤F1 / F≤2.8, 0.2≤d7 / ET7≤1.5 and 0.35≤(d4+d5+d6) / F≤0.9; Wherein, d1 is the center thickness of the first lens, d2 is the center thickness of the second lens, F1 is the focal length of the first lens, F is the effective focal length of the optical lens, d7 is the center thickness of the seventh lens, ET7 is the edge thickness of the seventh lens, d4 is the center thickness of the fourth lens, d5 is the center thickness of the fifth lens, and d6 is the center thickness of the sixth lens.

2. The optical lens according to claim 1, characterized in that, The first side surface of the first lens is convex and the second side surface is convex, or the first side surface of the first lens is convex and the second side surface is concave. The first side surface of the second lens is concave and the second side surface is convex, or the first side surface of the second lens is concave and the second side surface is concave. The first side of the third lens is convex and the second side is convex, or the first side of the third lens is concave and the second side is convex, or the first side of the third lens is convex and the second side is concave. The fourth lens has positive optical power, with its first side surface being convex and its second side surface being convex; or the fourth lens has positive optical power, with its first side surface being convex and its second side surface being concave; or the fourth lens has negative optical power, with its first side surface being concave and its second side surface being concave. The fifth lens has positive optical power, with its first side surface being convex and its second side surface being convex; or the fifth lens has positive optical power, with its first side surface being convex and its second side surface being concave; or the fifth lens has positive optical power, with its first side surface being concave and its second side surface being convex; or the fifth lens has negative optical power, with its first side surface being concave and its second side surface being concave; or the fifth lens has negative optical power, with its first side surface being concave and its second side surface being convex; or the fifth lens has negative optical power, with its first side surface being convex and its second side surface being concave. The sixth lens has positive optical power, with its first side surface being convex and its second side surface being convex; or the sixth lens has positive optical power, with its first side surface being concave and its second side surface being convex; or the sixth lens has positive optical power, with its first side surface being convex and its second side surface being concave; or the sixth lens has negative optical power, with its first side surface being concave and its second side surface being concave; or the sixth lens has negative optical power, with its first side surface being concave and its second side surface being convex; or the sixth lens has negative optical power, with its first side surface being convex and its second side surface being concave. The seventh lens has a positive optical power, or the seventh lens has a negative optical power.

3. The optical lens according to claim 1 or 2, characterized in that, The radius of curvature R13 of the first side surface of the seventh lens and the effective focal length F of the optical lens satisfy: 0 <R13 / F≤5。 4. The optical lens according to claim 1 or 2, characterized in that, The radius of curvature R14 of the second side surface of the seventh lens and the effective focal length F of the optical lens satisfy: 0 <R14 / F≤1。 5. The optical lens according to claim 1 or 2, characterized in that, The axial distance d23 from the second side surface of the second lens to the first side surface of the third lens, the radius of curvature R3 of the first side surface of the second lens, the effective focal length F of the optical lens, and the total optical length TTL of the optical lens satisfy: -0.3≤(d23×R3) / (F×TTL)<0.

6. The optical lens according to claim 1 or 2, characterized in that, The effective focal length F of the optical lens, the focal length F6 of the sixth lens, and the focal length F7 of the seventh lens satisfy the following conditions: 0 < |F / F6| ≤ 3.5 and 0 < |F / F7| ≤ 1.

5.

7. The optical lens according to claim 1 or 2, characterized in that, The radius of curvature R14 of the second side of the seventh lens and the center thickness d7 of the seventh lens satisfy: 0.1≤(R14+d7) / R13≤3.

8. The optical lens according to claim 1 or 2, characterized in that, The focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy: 0 < |F6 / F7| ≤ 4.

9. The optical lens according to claim 1 or 2, characterized in that, The 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: 1.2≤F / H≤2.

10. An electronic device, characterized in that, include: Optical lens according to any one of claims 1 to 9; as well as At least one of an imaging element and a light source; The imaging element is used to convert the optical image or optical information formed by the optical lens into an electrical signal; 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 illuminated area on the first side of the optical lens.

Images