Optical lens and electronic device

Abstract

The application discloses an optical lens and an electronic device, and relates to the field of optical elements. The optical lens comprises, in sequence from a first side to a second side along an optical axis: a first lens with negative optical power, the second side of the first lens being a concave surface; a second lens with positive optical power, the second side of the second lens being a convex surface; a third lens with positive optical power; a fourth lens with positive optical power; a fifth lens with optical power; a sixth lens with optical power, the optical power of the sixth lens being opposite to that of the fifth lens; a seventh lens with positive optical power, the first side of the seventh lens being a convex surface; an eighth lens with optical power; and the number of lenses with optical power in the optical lens is eight.

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 development of intelligent driving technology, automotive optical lenses are facing the dual demands of improved imaging performance and structural integration. Hidden installation has become the mainstream layout for automotive optical lenses, balancing vehicle aesthetics and ease of installation while placing higher demands on the miniaturization and compactness of lens modules. Simultaneously, higher levels of autonomous driving technology are placing increasingly stringent demands on perception range and image accuracy, leading to the widespread adoption of large-area image sensors with resolutions of 12 megapixels or more (such as 17 megapixels) to capture larger scenes. Furthermore, the spatial resolution of optical lenses for small targets has significantly improved, with low-distortion designs driven by the trend of non-uniform illumination on the low image-side focal plane aiming to achieve more refined sampling and recognition of targets of the same size.

[0003] Based on the aforementioned requirements for large target area and high resolution, color difference control over a wide spectral range has become a key bottleneck restricting the reliability of image recognition. In automotive fixed-focus architectures, the tolerance of optical lenses for focal point shifts of different monochromatic lights is drastically reduced. Therefore, RGB (Red-Green-Blue) confocal design has become an important technical direction for improving the accuracy of image fusion processing. Simultaneously, the complex and ever-changing actual driving environment requires optical lenses to have both a large aperture to ensure image brightness in low-light conditions and to maintain stable back focus and imaging performance under wide-temperature thermal shock conditions through anechoic optical design.

[0004] However, existing automotive lens designs cannot simultaneously meet the requirements of miniaturization, high resolution, low distortion, large aperture, and chromatic aberration control over a wide spectral range, thus hindering the development of automotive lenses in the field of intelligent driving technology. Summary of the Invention

[0005] This application aims to provide an optical lens and electronic device to solve at least one of the technical problems described above.

[0006] The first aspect of this application provides an optical lens comprising, along the optical axis from a first side to a second side, the following components in sequence: a first lens having negative optical power, the second side of which is concave; a second lens having positive optical power, the second side of which is convex; a third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having optical power; a sixth lens having optical power, the optical power of which is opposite to that of the fifth lens; a seventh lens having positive optical power, the first side of which is convex; and an eighth lens having optical power; the number of lenses having optical power in the optical lens is eight. The optical lens satisfies the following: -1.5≤F1 / F≤-0.4, 1.65≤Nd1≤2.1, 1.9≤Nd3≤2.1, 35≤Vd2≤100, and 0.055≤TTL / H / FOV×1°≤0.08; where F1 is the focal length of the first lens, F is the total focal length of the optical lens group, Nd1 is the refractive index of the first lens, Nd3 is the refractive index of the third 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, and Vd2 is the Abbe number of the second lens.

[0007] According to an exemplary embodiment of this application, the fifth lens has positive optical power and its first side surface is convex; the sixth lens has negative optical power and its second side surface is concave; or, the fifth lens has negative optical power, its first side surface is concave, its second side surface is concave, and the sixth lens has positive optical power, its first side surface is convex, and its second side surface is concave; the eighth lens has negative optical power and its first side surface is concave; or, the eighth lens has positive optical power, its first side surface is convex, and its second side surface is concave. The fourth and fifth lenses are cemented together to form a cemented lens; or, the fifth and sixth lenses are cemented together to form a cemented lens; or, the sixth and seventh lenses are cemented together to form a cemented lens; or, the fourth, fifth, and sixth lenses are cemented together to form a cemented lens; the first and second side surfaces of the first lens and the eighth lens are both aspherical; the optical lens also includes an aperture stop, which is disposed between the fourth and fifth lenses, or between the third and fourth lenses.

[0008] The parameters involved in this application have the following meanings: F1 is the focal length of the first lens, F is the total focal length of the optical lens group, Nd1 is the refractive index of the first lens, Nd3 is the refractive index of the third lens, Vd2 is the Abbe number of the second 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, θ is the radian value corresponding to the maximum field of view of the optical lens, D11 is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F7 is the focal length of the seventh lens, R22 is the central radius of curvature of the second side of the second lens, R31 is the central radius of curvature of the first side of the third lens, R32 is the central radius of curvature of the second side of the third lens, R41 is the fourth lens... The center radius of curvature of the first side of the lens, D31 is the maximum aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens, D81 is the maximum aperture of the first side of the eighth lens corresponding to the maximum field of view of the optical lens, D71 is the maximum aperture of the first side of the seventh lens corresponding to the maximum field of view of the optical lens, CT1 is the center thickness of the first lens, R12 is the center radius of curvature of the second side of the first lens, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, T78 is the air gap between the seventh and eighth lenses, CT7 is the center thickness of the seventh lens, R71 is the center radius of curvature of the first side of the seventh lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, R21 is the center radius of curvature of the first side of the second lens, T34 is the air gap between the third and fourth lenses, CT8 is the center thickness of the eighth lens, and F8 is the focal length of the eighth lens.

[0009] According to an exemplary embodiment of this application, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy: 0.65≤F2 / F≤2.4.

[0010] According to an exemplary embodiment of this application, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy: 1.5≤F3 / F≤5.

[0011] According to an exemplary embodiment of this application, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy: 0.15≤F4 / F≤7.

[0012] According to an exemplary embodiment of this application, the focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy: 0.15≤F7 / F≤2.65.

[0013] According to an exemplary embodiment of this application, the total focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.1≤F / H≤1.3.

[0014] According to an exemplary embodiment of this application, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens satisfy: 0 < |(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.07.

[0015] According to an exemplary embodiment of this application, the central curvature radius R22 of the second side surface of the second lens and the central curvature radius R31 of the first side surface of the third lens satisfy: -1.7≤(R22+R31) / (R22-R31)≤0.7.

[0016] According to an exemplary embodiment of this application, the total optical length TTL of the optical lens and the total focal length F of the optical lens satisfy: 2≤TTL / F≤3.

[0017] According to an exemplary embodiment of this application, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens satisfy: 0.85≤(H / 2) / (F×tan(θ / 2))≤1.

[0018] According to an exemplary embodiment of this application, the center thickness CT7 of the seventh lens and the center radius of curvature R71 of the first side surface of the seventh lens satisfy: 0 <CT7 / R71≤1.75。

[0019] According to an exemplary embodiment of this application, the focal length F1 of the first lens and the focal length F2 of the second lens satisfy: -1≤F1 / F2≤-0.42.

[0020] According to an exemplary embodiment of this application, the focal length F2 of the second lens, the focal length F3 of the third lens, and the focal length F4 of the fourth lens satisfy: 0.3≤(F2+F4) / F3≤6.

[0021] According to an exemplary embodiment of this application, the center thickness CT8 of the eighth lens and the total focal length F of the optical lens satisfy 0.08≤CT8 / F≤0.25.

[0022] According to an exemplary embodiment of the present application, the optical lens satisfies at least one of the following relational expressions: 55≤(FOV×F) / H / 1°≤62, F / F8≤0.18, 6.5≤(Nd1×Vd2×Nd3) / F×1mm≤17, 0≤(R32-R41) / (R32+R41)≤6, 0.95≤D31 / D81≤1.75, 50≤Vd2≤95, 1.6820≤Nd1≤2.0020, 1.923≤Nd3≤2.001, 0.8≤D31 / D71≤2.2, 0.8≤(F×θ) / D11 / rad≤1.1, 1.5≤F / ENPD≤1.9, 0<CT1 / R12≤0.55, 0.4≤CT2 / CT3≤2.5, 0.1≤T78 / CT7≤6.5, -4≤F5 / F6≤-0.1, 0.055≤BFL / TTL≤0.08, 0.11≤CT2 / F2≤0.35, -0.1≤R22 / (CT2-R21)≤1.45 or 0.015≤T34 / CT2≤1.15.

[0023] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 56.522≤(FOV×F) / H / 1°≤60.214, 52.68≤Vd2≤71.30, 2.348≤TTL / F≤2.821, 0.061≤TTL / H / FOV×1°≤0.072, 0.86≤(F×θ) / D11 / rad≤1.012, 0.06≤BFL / TTL≤0.072, 1.178≤F / H≤1.252, 1.61≤ F / ENPD≤1.8, 0.004<|(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.048, 0.895≤(H / 2) / (F×tan(θ / 2))≤0.95 4. -1.24≤F1 / F≤-0.669, 0.995≤F2 / F≤2.033, 1.784≤F3 / F≤4.127, 0.644≤F4 / F≤5.442, 0.7≤F7 / F≤2.364, 8.055≤( Nd1×Vd2×Nd3) / F×1mm≤14.296, -1.235≤(R22+R31) / (R22-R31)≤0.217, 0.181≤(R32-R41) / (R32+R41)≤4.023, 1 .108≤D31 / D81≤1.476, 1.1≤D31 / D71≤1.85, 0.007≤CT1 / R12≤0.316, 0.845≤CT2 / CT3≤2.049, 0.322≤T78 / CT7≤0.7 55. 0.101≤CT7 / R71≤1.093, -0.901≤F1 / F2≤-0.458, 0.748≤(F2+F4) / F3≤4.131, -2.847≤F5 / F6≤-0.217, 0.119≤CT2 / F2≤0.302, -0.178≤R22 / (CT2-R21)≤1.428, 0.017≤T34 / CT2≤0.558, 0.094≤CT8 / F≤0.216 or -1.2≤F / F8≤0.169.

[0024] The second aspect of this application provides an electronic device comprising an optical lens as described in the exemplary embodiments above, and at least one of an imaging element and a light source, wherein the imaging element is located on a second side of the optical lens and is used to convert an optical image or optical information formed by the optical lens into an electrical signal, and the light source is located on the second side of the optical lens, wherein light emitted by the light source is projected onto a 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.

[0025] The optical lens according to an embodiment of this application employs eight lenses with optical power. The optical lens includes a first lens with negative optical power, the second side of which is concave; a second lens with positive optical power, the second side of which is convex; a third lens with positive optical power; a fourth lens with positive optical power; a fifth lens with optical power; a sixth lens with optical power, the optical power of which is opposite to that of the fifth lens; a seventh lens with positive optical power, the first side of which is convex; and an eighth lens with optical power.

[0026] The optical lens provided in this application satisfies the following relationships: -1.5≤F1 / F≤-0.4, 1.65≤Nd1≤2.1, 1.9≤Nd3≤2.1, 35≤Vd2≤100, and 0.055≤TTL / H / FOV×1°≤0.08. Through the synergistic effect of these relationships, a large field-of-view light can be collected into the optical lens, and the light can be effectively diverged, which is beneficial for matching the telephoto and large image plane required for imaging. It also allows the first lens to have a high refractive index, enabling it to collect and diverge object-side light with a smaller volume. Furthermore, it allows the optical lens to simultaneously achieve miniaturization and large target-area imaging, meeting the application scenarios of tens of millions of pixels. Simultaneously, through the combination of refractive index and Abbe number, chromatic aberration correction can be achieved, further improving the confocal capability and image quality of the optical lens.

[0027] In this application, the first lens uses a high-refractive-index material, enabling it to effectively collect and moderately diverge object-side light rays within a relatively small size, thereby controlling the initial beam trajectory. To suppress the adjustment sensitivity introduced by the increased amplitude of light trajectory changes, and to simultaneously achieve good correction of axial and magnification chromatic aberration, while preventing excessive light divergence that would cause subsequent lenses to bear excessive refractive power, this application differentiates the optical characteristics of subsequent positive lenses: the second positive lens uses a high Abbe number material to effectively suppress dispersion accumulation; the third positive lens uses a high-refractive-index material to ensure efficient deflection and focusing of the light path within a compact space. Through the synergistic matching of the refractive index and Abbe number of the above materials, while compressing the overall optical length, it can effectively match the image height requirements of a large target surface image sensor, thereby achieving a balance between miniaturization and high image quality. Attached Figure Description

[0028] 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 1-12 A schematic diagram of the structure of an optical lens according to embodiments 1-12 of this application is shown; Figure 13A schematic diagram of the modulation transfer function (MTF) curve of the optical lens according to Embodiment 1 of this application is shown.

[0029] Figure 14 The axial chromatic aberration curve of the optical lens according to Embodiment 1 of this application is shown; Figure 15 A schematic diagram of the defocus modulation transfer function curve of the optical lens according to Embodiment 1 of this application is shown.

[0030] Explanation of reference numerals in the attached figures: First lens L1; Second lens L2; ​​Third lens L3; Fourth lens L4; Fifth lens L5; Sixth lens L6; Seventh lens L7; Eighth lens L8; Aperture stop STO; The first side surface S1 of the first lens L1, and the second side surface S2 of the first lens L1; The first side surface S3 of the second lens L2, the second side surface S4 of the second lens L2; The first side surface S5 of the third lens L3, the second side surface S6 of the third lens L3; The first side surface S7 of the fourth lens L4, and the second side surface S8 of the fourth lens L4; The first side surface S9 of the fifth lens L5, and the second side surface S10 of the fifth lens L5; The first side surface S11 of the sixth lens L6, and the second side surface S12 of the sixth lens L6; The first side surface S13 of the seventh lens L7, and the second side surface S14 of the seventh lens L7; The first side surface S15 of the eighth lens L8, and the second side surface S16 of the eighth lens L8; The first side surface of the filter is S17, and the second side surface of the filter is S18; The first side of the protective glass is S19, and the second side of the protective glass is S20. Detailed Implementation

[0031] 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 descriptions 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. 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 indicate any limitation on the features. Therefore, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of this application. In the drawings, for ease of illustration, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the shapes of spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly drawn to scale.

[0032] In this document, 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. 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 term "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. Unless otherwise specified, all terms used herein (including technical and scientific terms) 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., terms defined in common dictionaries) should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense, unless expressly so defined herein. It should be noted that, 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.

[0033] The features, principles and other aspects of this application are described in detail below.

[0034] An optical lens according to an exemplary embodiment of this application may include eight lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are arranged sequentially from the first side to the second side along the optical axis.

[0035] In an example embodiment, the optical lens can be used as, for example, an imaging optical lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image side. Light from the object side can be imaged on the image side. The second side of the optical lens is provided with an imaging surface. The imaging optical lens can be a vehicle-mounted optical lens, a security monitoring optical lens, or a radar receiver optical lens. In an example embodiment, the optical lens can be used as, for example, a projection optical lens or a lidar transmitter optical lens. In this case, the second side of the optical lens can be the image source side, and the first side can be the 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. In an example embodiment, the optical lens provided in this application can be used as a light-receiving optical lens or a light-emitting optical lens. The light-receiving optical lens is typically used to collect light from the object-side space. The collected light is used to form detection information, including but not limited to imaging and laser point clouds. The light-emitting optical lens is typically used to transmit light from a light-emitting unit to the object-side space. According to the function of the light, the light transmitted to the object-side space can be divided into projection light for forming a projected image or detection light for detecting target information, etc. It is understood that when the optical lens provided in this application is used as a light-receiving optical lens such as a camera optical lens, a lidar receiver optical lens, a microscopic optical lens, or a telescope optical lens, the term "first side" as used herein can refer to the object side, and "second side" can 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 optical lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, or a security monitoring camera. When the optical lens provided in this application is used as a light-emitting optical lens such as a projection optical lens or a lidar transmitter optical lens, the term "first side" as used herein can refer to the object side, and "second side" can refer to the light source side. In some possible implementations, the optical lens provided in this application can also simultaneously perform light-receiving and light-emitting functions. For example, the optical lens provided in this application is used in a lidar optical lens that shares a light-receiving and light-emitting path, where the optical lens simultaneously performs the functions of emitting laser light and receiving radar echo beams. For example, the optical lens provided in this application is used in an optical communication and radar integration optical lens, which simultaneously performs the functions of transmitting modulated optical signals and receiving radar echo beams.

[0036] In an exemplary embodiment, the first lens has negative optical power, and its second side is concave. The negative optical power of the first lens is used to diverge light, which is beneficial for collecting light rays with a large field of view and controlling the light entering the optical lens. Simultaneously, in coordination with the subsequent second, third, and fourth lenses, which are arranged sequentially on the optical axis and have positive optical power, the light collected in front is converged step by step by the three positive lenses. This effectively controls the incident height of the light when it reaches the rear lens, thereby reducing the aperture of the rear lens and enabling miniaturization of the optical lens. The concave second side of the first lens allows light rays with a converging tendency in the rear group to be reflected and diverged when incident on the concave surface. This helps reduce the concentration of ghosting energy and weaken the intensity of ghosting.

[0037] In an exemplary embodiment, the second lens has positive optical power and is used to converge incident light rays, reducing the light height as the light enters the rear lens group. This reduced light height allows for a smaller aperture in the rear lenses, achieving a compact structure and miniaturizing the optical lens. Simultaneously, the incident angle of the light entering the rear lens group decreases, reducing the sensitivity of each lens in the rear group to optical power deviations. The second lens, being a positive lens, can generate a certain amount of negative spherical aberration. This negative spherical aberration balances the aberrations generated by the first lens, improving the resolving power of the optical lens. The second side surface of the second lens is convex, which converges the light rays from the entire optical lens, reducing the degree of light compression when entering the third and fourth lenses, thereby reducing the sensitivity of the optical lens.

[0038] In an exemplary embodiment, the third lens has positive optical power, further converging the light rays converged by the second lens to reduce the light height. Simultaneously, it smoothly transitions the descent of the light rays between the second and fourth lenses, reducing the sensitivity of the third and fourth lenses and achieving a high yield rate for the optical lens. By constructing a high-refractive-index, positive-optical-power third lens after the second lens, the light trajectory is further lowered, allowing for miniaturization of the optical lens while correcting field curvature. The positive-optical-power third lens can alter the increasing trend of the height difference between the light rays from the first and second lenses entering the rear lens group, adjusting the height difference and thus reducing optical lens distortion.

[0039] In an exemplary embodiment, the fourth lens has positive optical power, converges the light transmitted by the third lens, and causes the light to fall rapidly, thereby correcting field curvature while achieving miniaturization of the optical lens. Furthermore, when operating in a large-aperture environment, the fourth lens can effectively improve pupil aberration, achieving high resolution for the optical lens.

[0040] In an exemplary embodiment, the fifth lens has positive optical power and its first side surface is convex. As a positive lens, the fifth lens can receive and compress converging light rays, thus miniaturizing the lens aperture. Simultaneously, it works in conjunction with the sixth lens, which has negative optical power, to correct aberrations and chromatic aberration. The convex first side surface can share the burden of light convergence, allowing light to descend smoothly through the second and fourth lenses, thereby reducing the lens aperture and backgroup sensitivity.

[0041] In an exemplary embodiment, the fifth lens has negative optical power, and both its first and second side surfaces are concave. As a negative lens, the fifth lens diverges light rays, making the light entering the subsequent lens group smoother, rationally distributing optical power, and reducing the sensitivity of the subsequent lens group. The concave nature of both the first and second side surfaces allows light rays to bend rapidly within the negative lens, generating a larger positive spherical aberration, balancing overall aberrations, compensating for higher-order aberrations, and achieving high resolution in the optical lens.

[0042] In an exemplary embodiment, the sixth lens has positive optical power, with its first side surface being convex and its second side surface being concave. As a positive lens, the sixth lens converges light rays, allowing them to rise smoothly as a whole. This effectively reduces the aperture of the subsequent lens group and rationally distributes the optical power, enabling a smooth transition in the incident angles of light from each lens in the subsequent group, thereby reducing the sensitivity of the subsequent lens group. The convex first side surface and concave second side surface allow light rays to rise smoothly as they pass through the sixth lens, effectively reducing the incident angle of light from the sixth lens and lowering the sensitivity of the subsequent lens group.

[0043] In an exemplary embodiment, the sixth lens has negative optical power, and its second side surface is concave. As a negative lens, the sixth lens effectively diverges the forward light beam, raising the light beam height. This causes the light beam height of the subsequent lenses to rise rapidly, effectively balancing the optical path difference and achieving high resolution. The concave second side surface of the sixth lens, through its negative optical power divergence, allows the light beam to rise rapidly, effectively increasing the height difference of the outgoing light beam, balancing the optical path difference, and achieving high resolution.

[0044] In an exemplary embodiment, the seventh lens has positive optical power, and its first side surface is convex. As a positive lens, the seventh lens converges light rays, reducing the upward trend of light rays from the sixth lens (which has negative optical power), resulting in a smoother upward trajectory, more efficient distribution of optical power, and reduced sensitivity of the subsequent lens group. Simultaneously, negative spherical aberration is generated during the convergence process, which compensates for the positive spherical aberration produced by other negative lenses, achieving high resolution in the optical lens. The positive nature of the seventh lens also allows for a lower light beam height, enabling miniaturization of the optical lens. The convex first side surface of the seventh lens shares the light convergence burden, allowing light rays to rise smoothly between the sixth and eighth lenses and efficiently distributing optical power.

[0045] In an exemplary embodiment, the eighth lens has negative optical power and a concave first side surface. As a negative lens, the eighth lens effectively diverges light, significantly increasing the light exit angle and thus adapting to the chip's response curve. Simultaneously, the eighth lens allows light to rise smoothly, and the resulting positive spherical aberration balances the negative spherical aberration generated by other positive lenses, creating complementarity and improving the image quality of the optical lens. The concave first side surface of the eighth lens reduces the incident angle of light, lowering the sensitivity of the optical lens.

[0046] In an exemplary embodiment, the eighth lens has positive optical power, a first convex surface, and a second concave surface. As a positive lens, the eighth lens converges light rays, allowing them to incident smoothly onto the image plane, thereby obtaining a suitable principal ray angle and improving the resolving power of the optical lens. The convex first surface of the eighth lens can inherit the converging trend of the seventh lens, resulting in a smooth light transition and reduced sensitivity. The concave second surface of the eighth lens can smooth the light path while balancing the positive spherical aberration generated by the concave surface against the negative spherical aberration generated by the convex surface.

[0047] In an exemplary embodiment, the optical lens may further include an aperture stop. The aperture stop may be positioned between the third and fourth lenses, or between the fourth and fifth lenses, which facilitates effective light convergence entering the optical lens, reduces the lens aperture at the rear of the optical lens, and lowers the assembly sensitivity of the optical lens. Furthermore, the position of the aperture stop can be adjusted according to actual needs and is not limited to the example described.

[0048] In an exemplary embodiment, the surface of the first lens may have one or more aspherical surfaces. By adjusting the exit angle of light rays using aspherical surfaces, distortion can be effectively reduced. Simultaneously, the first lens has negative optical power, which can effectively increase positive spherical aberration, balance aberrations, and effectively reduce light beam height, thus achieving miniaturization of the optical lens.

[0049] In an exemplary embodiment, the surface of the eighth lens may have one or more aspherical surfaces. By adjusting the exit angle of light rays through the aspherical surfaces, the convergence of light rays at different full pupil positions in different fields of view can be enhanced, the optical path difference of light rays in each field of view can be balanced, high resolution of the optical lens can be achieved, and the principal ray angle can be effectively reduced, enabling miniaturization of the optical lens.

[0050] In an exemplary embodiment, the first lens is provided with a curvature point, which serves as a support surface during the lens manufacturing process and also makes it less likely for dust to accumulate in dead corners on the lens surface, thus reducing dust accumulation on the lens surface.

[0051] In an exemplary embodiment, the eighth lens is provided with a curvature point. This curvature point effectively reduces the exit angle and principal ray angle of the edge rays, causing the edge rays of the negative lens to converge. This effectively improves the performance of the optical lens, reduces the exit angle and exit height of the edge rays, thereby reducing sensitivity and effectively reducing the aperture of the rear lens group. Furthermore, it can also reduce the sagitta of the second side, effectively reducing manufacturing difficulty and increasing the edge distance between the eighth lens and the rear lens group, resulting in a compact structure and miniaturization of the optical lens.

[0052] In an exemplary embodiment, the fourth and fifth lenses are cemented together to form a cemented lens. Alternatively, the fifth and sixth lenses are cemented together to form a cemented lens. Alternatively, the sixth and seventh lenses are cemented together to form a cemented lens. Alternatively, the fourth, fifth, and sixth lenses are cemented together to form a cemented lens. Cemented doublet lenses can reduce the sensitivity of a single negative focal length lens, and can effectively correct axial and transverse chromatic aberration of the optical lens by utilizing the dispersion differences of different materials. They also improve monochromatic aberrations such as spherical aberration and coma, enhance the imaging quality across the entire field of view, and eliminate ghosting caused by lens reflections between individual lenses. Cemented doublet lenses can reduce the edge thickness of lenses with positive focal lengths, which is beneficial for rapid light refraction, thereby improving the optical performance of the optical lens.

[0053] In an example embodiment, the optical lens may further include an infrared cut-off filter (IR) located between the eighth lens and the image plane to filter light of different wavelengths. The optical lens may also, as needed, have a cover glass (CG) 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 lens of the optical lens is made of glass, which is beneficial for the realization of a pyrochemical design. By properly matching the lenses, it is beneficial to achieve an achromatic design.

[0055] The second aspect of this application provides an electronic device comprising an optical lens as described in the exemplary embodiments above, and at least one of an imaging element and a light source, wherein the imaging element is located on a second side of the optical lens and is used to convert an optical image or optical information formed by the optical lens into an electrical signal, and the light source is located on the second side of the optical lens, wherein light emitted by the light source is projected onto a 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.

[0056] The parameters involved in this application have the following meanings: F1 is the focal length of the first lens, F is the total focal length of the optical lens group, Nd1 is the refractive index of the first lens, Nd3 is the refractive index of the third lens, Vd2 is the Abbe number of the second 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, θ is the radian value corresponding to the maximum field of view of the optical lens, D11 is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F7 is the focal length of the seventh lens, R22 is the central radius of curvature of the second side of the second lens, R31 is the central radius of curvature of the first side of the third lens, R32 is the central radius of curvature of the second side of the third lens, R41 is the fourth lens... The center radius of curvature of the first side of the lens, D31 is the maximum aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens, D81 is the maximum aperture of the first side of the eighth lens corresponding to the maximum field of view of the optical lens, D71 is the maximum aperture of the first side of the seventh lens corresponding to the maximum field of view of the optical lens, CT1 is the center thickness of the first lens, R12 is the center radius of curvature of the second side of the first lens, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, T78 is the air gap between the seventh and eighth lenses, CT7 is the center thickness of the seventh lens, R71 is the center radius of curvature of the first side of the seventh lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, R21 is the center radius of curvature of the first side of the second lens, T34 is the air gap between the third and fourth lenses, CT8 is the center thickness of the eighth lens, and F8 is the focal length of the eighth lens.

[0057] In an exemplary embodiment, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy the following condition: -1.5 ≤ F1 / F ≤ -0.4. Preferably, -1.24 ≤ F1 / F ≤ -0.669. By controlling the range of this relationship, light rays with a large field of view can be collected into the optical lens, and light rays can be effectively diverged, which is beneficial for matching the telephoto lens and large image plane required for imaging.

[0058] In an exemplary embodiment, the refractive index Nd1 of the first lens and the refractive index Nd3 of the third lens satisfy the following conditions: 1.65 ≤ Nd1 ≤ 2.1, 1.9 ≤ Nd3 ≤ 2.1. Preferably, 1.6820 ≤ Nd1 ≤ 2.0020, 1.923 ≤ Nd3 ≤ 2.001. Controlling the range of this relationship allows for a larger field of view (FOV), which is beneficial for achieving large aperture applications in optical lenses and for effectively correcting chromatic aberration by processing the incident beam.

[0059] In an exemplary embodiment, the Abbe number Vd2 of the second lens (here, the Abbe number corresponds to the 510nm band) satisfies: 35 ≤ Vd2 ≤ 100. Preferably, 50 ≤ Vd2 ≤ 95. More preferably, 52.68 ≤ Vd2 ≤ 71.30. Controlling this parameter range allows the positive second lens to have low dispersion, reducing the focal shift amplitude of the second lens itself; and it can form an achromatic pair with the negative optical power first lens, reducing residual chromatic aberration, which is beneficial for confocal capability and imaging quality in a wide working band of 440nm~650nm.

[0060] In an exemplary embodiment, the total optical length (TTL) of the optical lens, the image height (H) corresponding to the maximum field of view (FOV) of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: 0.055 ≤ TTL / H / FOV × 1° ≤ 0.08. Preferably, 0.061 ≤ TTL / H / FOV × 1° ≤ 0.072. By controlling the range of this relationship, the optical lens can simultaneously achieve miniaturization and large-area imaging, and meet the application scenarios of tens of millions of pixels.

[0061] In an exemplary embodiment, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy the following condition: 0.65 ≤ F2 / F ≤ 2.4. Preferably, 0.995 ≤ F2 / F ≤ 2.033. By controlling the range of this relationship, the light collected and diverged by the first lens can be effectively converged by the second lens, thereby allowing the light to reach the imaging surface more quickly and achieving miniaturization of the optical lens.

[0062] In an exemplary embodiment, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy the following condition: 1.5 ≤ F3 / F ≤ 5. Preferably, 1.784 ≤ F3 / F ≤ 4.127. By controlling the range of this relationship, the third lens can further compress the light beam while maintaining a relatively smooth light path, which is more conducive to miniaturization of the optical lens. Combining a third lens with high refractive index and positive optical power after a second lens with positive optical power can further compress the light beam and, while achieving miniaturization of the optical lens, can significantly correct field curvature and reduce distortion.

[0063] In an exemplary embodiment, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the following condition: 0.15 ≤ F4 / F ≤ 7. Preferably, 0.644 ≤ F4 / F ≤ 5.442. By controlling the range of this relationship, the fourth lens can further compress the light beam while maintaining a relatively smooth light path, thereby further miniaturizing the optical lens.

[0064] In an exemplary embodiment, the focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy the following condition: 0.15 ≤ F7 / F ≤ 2.65. Preferably, 0.7 ≤ F7 / F ≤ 2.364. By controlling the range of this relationship, the ratio of the focal length of the seventh lens to the total focal length of the optical lens can be kept within a small range. This allows for the convergence of light rays after they have diverged from the front lens, reducing light energy loss during propagation and improving illumination. Simultaneously, the negative spherical aberration generated by the convergence of the seventh lens effectively compensates for the positive spherical aberration generated by the multiple negative lenses in front, thereby improving the resolving power of the optical lens.

[0065] In an exemplary embodiment, the 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: 1.1 ≤ F / H ≤ 1.3. Preferably, 1.178 ≤ F / H ≤ 1.252. By controlling the range of this relationship, the optical lens can have the characteristics of telephoto and large target area, thereby realizing the telephoto function of the optical lens and achieving the effect of tens of millions of pixels.

[0066] In an exemplary embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens satisfy: 0 < |(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.07. Preferably, 0.004 < |(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.048. Controlling the range of this relationship can improve the angular reciprocal of the central region of the optical lens, which is beneficial to improving the imaging effect in the central region.

[0067] In an exemplary embodiment, the central radius of curvature R22 of the second side surface of the second lens and the central radius of curvature R31 of the first side surface of the third lens satisfy: -1.7 ≤ (R22 + R31) / (R22 - R31) ≤ 0.7. Preferably, -1.235 ≤ (R22 + R31) / (R22 - R31) ≤ 0.217. By controlling the range of this relationship, light rays, after being compressed by the second side surface of the second lens, can be received by the first side surface of the third lens, thereby effectively reducing light energy loss and improving illuminance.

[0068] In an exemplary embodiment, the total length (TTL) of the optical lens and the total focal length (F) of the optical lens satisfy the following condition: 2 ≤ TTL / F ≤ 3. Preferably, 2.348 ≤ TTL / F ≤ 2.821. By controlling the range of this relationship, the optical lens can achieve miniaturization while possessing telephoto capabilities.

[0069] In an exemplary embodiment, the image height H corresponding to the maximum field angle of the optical lens, the overall focal length F of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy: 0.85≤(H / 2) / (F×tan(θ / 2))≤1. Preferably, 0.895≤(H / 2) / (F×tan(θ / 2))≤0.954. Controlling the range of this relational expression can make the angular resolution of the edge field of view and the central field of view of the optical lens relatively uniform, reduce the distortion of the optical lens, and at the same time improve the recognition ability of the optical lens for tiny objects.

[0070] In an exemplary embodiment, the center thickness CT7 of the seventh lens and the center radius of curvature R71 of the first side surface of the seventh lens satisfy: 0<CT7 / R71≤1.75. Preferably, 0.037≤CT7 / R71≤1.093. Controlling the range of this relational expression can further correct aberrations, thereby ensuring clear imaging at the ten-megapixel level.

[0071] In an exemplary embodiment, the focal length F1 of the first lens and the focal length F2 of the second lens satisfy: -1≤F1 / F2≤-0.42. Preferably, -0.901≤F1 / F2≤-0.458. Controlling the range of this relational expression can make the properties of the first lens and the second lens opposite, but the numerical values of their focal lengths are close, which can prevent the object-side light from excessively diverging before entering the rear lenses and causing the required aperture of the rear lenses to increase, thereby ensuring a small front-end aperture of the optical lens.

[0072] In an exemplary embodiment, the focal length value F2 of the second lens, the focal length value F4 of the fourth lens, and the focal length value F3 of the third lens satisfy: 0.3≤(F2+F4) / F3≤6. Preferably, 0.748≤(F2+F4) / F3≤4.131. The third lens and the two lenses before and after it all have positive refractive power. Controlling the range of this relational expression can make the light converge gently in these three consecutive lenses with positive refractive power, which can effectively reduce the sensitivity of the optical lens.

[0073] In an exemplary embodiment, the maximum field angle FOV of the optical lens, the overall focal length F of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens satisfy: 55≤(FOV×F) / H / 1°≤62. Preferably, 56.522≤(FOV×F) / H / 1°≤60.214. Controlling the range of this relational expression enables the optical lens to achieve the characteristics of a long focal length and a large target surface at the same time. Meanwhile, it can also effectively reduce the distortion of the optical lens and increase the average angular resolution of each field of view.

[0074] In an exemplary embodiment, the refractive index Nd1 of the first lens, the Abbe number Vd2 of the second lens (here, the Abbe number corresponds to the 510nm band), and the refractive index Nd3 of the third lens satisfy the following condition: 6.5 ≤ (Nd1 × Vd2 × Nd3) / F × 1mm ≤ 17, preferably 8.055 ≤ (Nd1 × Vd2 × Nd3) / F × 1mm ≤ 14.296. By controlling the range of this relationship, the refractive indices of the first and third lenses, as well as the Abbe number of the second lens, can be controlled. Furthermore, the first to third lenses possess high refractive indices, high Abbe numbers, and high refractive indices, ensuring that the light path does not exhibit steep deflection among these three lenses, thereby reducing lens sensitivity. Simultaneously, the combination of refractive indices and Abbe numbers enables chromatic aberration correction, further improving the confocal capability and imaging quality of the optical lens within a wide operating wavelength range of 440nm to 650nm.

[0075] In an exemplary embodiment, the central radius of curvature R32 of the second side surface of the third lens and the central radius of curvature R41 of the first side surface of the fourth lens satisfy: 0 ≤ (R32-R41) / (R32+R41) ≤ 6, preferably, 0.181 ≤ (R32-R41) / (R32+R41) ≤ 4.023. Controlling the range of this relationship allows for a smooth transition of light between the third and fourth lenses, which helps reduce the sensitivity of the optical system.

[0076] In an exemplary embodiment, the maximum aperture D31 of the first side of the third lens corresponding to the maximum field of view of the optical lens and the maximum aperture D81 of the first side of the eighth lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.95 ≤ D31 / D81 ≤ 1.75, preferably 1.108 ≤ D31 / D81 ≤ 1.476. By controlling the range of this relationship, the third to eighth lenses can exhibit symmetry, effectively reducing the sensitivity of the rear lenses and achieving aberration balance, resulting in a smaller change in the overall aperture of the lens.

[0077] In an exemplary embodiment, the maximum aperture D31 of the first side of the third lens corresponding to the maximum field of view of the optical lens and the maximum aperture D71 of the first side of the seventh lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.8 ≤ D31 / D71 ≤ 2.2, preferably 1.1 ≤ D31 / D71 ≤ 1.85. Controlling the range of this relationship is beneficial to reducing the rear aperture of the optical lens, thereby achieving miniaturization of the optical lens.

[0078] In an exemplary embodiment, the overall focal length F of the optical lens, the radian value θ corresponding to the maximum field of view angle of the optical lens, and the maximum clear aperture D11 of the first side surface of the first lens corresponding to the maximum field of view angle of the optical lens satisfy: 0.8≤(F×θ) / D11 / rad≤1.1, preferably, 0.86≤(F×θ) / D11 / rad≤1.012. Controlling the range of this relational expression can make the optical lens feature a long focal length and a large target surface, and realize a small front-end aperture of the optical lens.

[0079] In an exemplary embodiment, the overall focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: 1.5≤F / ENPD≤1.9, preferably, 1.61≤F / ENPD≤1.8. Controlling the range of this relational expression enables the large aperture of the optical lens to adapt to low-light environments.

[0080] In an exemplary embodiment, the center thickness CT1 of the first lens and the center radius of curvature R12 of the second side surface of the first lens satisfy: 0<CT1 / R12≤0.55, preferably, 0.007≤CT1 / R12≤0.316. Controlling the range of this relational expression allows the first lens to effectively collect and diverge object-side light while having a small aperture and small volume. Meanwhile, the ghost image energy can be diverged, so as to reduce the influence of ghost image energy on the imaging of the optical lens.

[0081] In an exemplary embodiment, the center thickness CT2 of the second lens and the center thickness CT3 of the third lens satisfy: 0.4≤CT2 / CT3≤2.5, preferably, 0.845≤CT2 / CT3≤2.049. Controlling the range of this relational expression makes the center thickness of the second lens close to the center thickness of the third lens, so as to effectively balance the light converging capability of the optical lens, avoid the problem of concentrated spherical aberration and coma caused by an excessively thick or excessively strong single lens, and meanwhile improve the imaging quality of the optical lens.

[0082] In an exemplary embodiment, the air interval T78 between the seventh lens and the eighth lens and the center thickness CT7 of the seventh lens satisfy: 0.1≤T78 / CT7≤6.5, preferably, 0.322≤T78 / CT7≤0.755. Controlling the range of this relational expression can effectively balance the center thickness of the seventh lens and the air interval between the seventh lens and the eighth lens, which is beneficial for light to converge gently to the image plane, obtain a suitable chief ray angle, and improve the imaging quality of the optical lens.

[0083] In an exemplary embodiment, the focal length F5 of the fifth lens and the focal length F6 of the sixth lens satisfy: -4≤F5 / F6≤-0.1, preferably -2.847≤F5 / F6≤-0.217. Controlling the range of this relationship is beneficial for correcting chromatic aberration and improving the confocal capability of the optical lens.

[0084] In an exemplary embodiment, the optical back focal length (BFL) and the total optical length (TTL) of the optical lens satisfy the following condition: 0.055 ≤ BFL / TTL ≤ 0.08, preferably 0.06 ≤ BFL / TTL ≤ 0.072. Controlling the range of this relationship effectively balances the back focal length of the optical lens and the total length of the optical system. Simultaneously, while meeting miniaturization requirements, it allows for sufficient space at the rear end of the optical lens, thereby achieving low sensitivity.

[0085] In an exemplary embodiment, the center thickness CT2 of the second lens and the focal length F2 of the second lens satisfy the following condition: 0.11 ≤ CT2 / F2 ≤ 0.35, preferably 0.119 ≤ CT2 / F2 ≤ 0.302. Controlling the range of this relationship allows the light collected by the first lens to be compressed at this point, thereby avoiding excessive divergence. It also corrects chromatic aberration and other aberrations introduced by the first lens, improving the resolving quality of the optical lens.

[0086] In an exemplary embodiment, the central radius of curvature R22 of the second side of the second lens, the central thickness CT2 of the second lens, and the central radius of curvature R21 of the first side of the second lens satisfy: -0.1 ≤ R22 / (CT2-R21) ≤ 1.45. Preferably, -0.178 ≤ R22 / (CT2-R21) ≤ 1.428. By controlling the range of this relationship, the central radii of curvature on both sides of the second lens can be kept within a gentle range, so that the light is moderately compressed in the second lens, avoiding excessive light divergence that would lead to a large overall length and physical aperture of the optical lens, which is beneficial for miniaturizing the optical system.

[0087] In an exemplary embodiment, the air gap T34 between the third and fourth lenses and the center thickness CT2 of the second lens satisfy the following condition: 0.015 ≤ T34 / CT2 ≤ 1.15, preferably 0.017 ≤ T34 / CT2 ≤ 0.558. Controlling the range of this relationship allows for effective compression of light in front, thereby reducing the converging pressure on the rear lenses, which helps to reduce the sensitivity of the optical lens and improve its stability.

[0088] In an exemplary embodiment, the center thickness CT8 of the eighth lens and the overall focal length F of the optical lens satisfy the following condition: 0.08 ≤ CT8 / F ≤ 0.25, preferably 0.094 ≤ CT8 / F ≤ 0.216. By controlling the range of this relationship, the eighth lens is controlled as an aspherical lens with a thicker center. The larger center thickness provides sufficient optical path, and in conjunction with the higher-order aspherical terms, it can effectively correct the remaining higher-order field curvature, astigmatism, and distortion of the system, making the image plane of the entire field of view tend to be flat, improving the modulation transfer function of the edge field of view, and adapting to the imaging requirements of large target surfaces and high pixels.

[0089] In an exemplary embodiment, the focal length F of the entire optical lens and the focal length F8 of the eighth lens satisfy: F / F8≤0.18, preferably -1.2≤F / F8≤0.169. By controlling the range of this relationship, the remaining residual field curvature can be effectively corrected, the divergence of the off-axis principal rays can be controlled, and the principal ray angle of the entire field of view can be optimized, thereby adapting to automotive sensors.

[0090] In an exemplary embodiment, the first lens may be made of heavy flint glass, such as D-ZF10 or D-ZF93. The second lens may be selected from a variety of grades, including crown glass or lanthanide glass such as H-K2, H-LAK1, H-K3, H-K5, H-ZPK71A, H-ZPK7, H-ZLAF68C, H-ZF72A, H-ZLAF90, H-LAK4L, and H-LAK50A. The third lens may be made of heavy flint glass such as H-ZF88, H-ZF72A, H-ZLAF90, and H-ZF62.

[0091] The optical lens according to the above embodiments of this application can employ multiple lenses, such as the eight lenses described above. By rationally allocating the optical parameters of each lens, at least one of the following beneficial effects is achieved: long focal length, large image area, low sensitivity, RGB confocal focus, miniaturization, high resolution, low distortion, high illumination, small aperture, and weak ghosting. It can also be well-matched to, for example, automotive chips, without producing vignetting. This optical lens exhibits excellent temperature performance, with minimal changes in imaging effect at high and low temperatures, and stable image quality. Therefore, the optical lens according to the above embodiments of this application can better meet the requirements of, for example, automotive applications.

[0092] Those skilled in the art will understand that the total optical length (TTL) of the optical lens used above refers to the axial distance from the center of the first lens of the optical lens to the imaging plane of the optical lens (e.g., the plane where IMA is located in the accompanying drawings); the back focal length (BFL) of the optical lens refers to the axial distance from the second side surface of the eighth 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). However, those skilled in the art will understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiment, the optical lens is not limited to including eight lenses. If necessary, the optical lens may also include other numbers of lenses.

[0093] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0094] Example 1 The following is for reference Figure 1 The optical lens according to Embodiment 1 of this application is described.

[0095] 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, a seventh lens L7, and an eighth lens L8. An aperture stop STO is positioned between the fourth lens L4 and the fifth lens L5. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens. The second side surface S16 of the eighth lens L8 has at least one inflection point. The first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8 are all aspherical surfaces.

[0096] The first lens L1 has negative optical power, the first side surface S1 is concave, and the second side surface S2 is concave.

[0097] The second lens L2 has positive optical power, the first side surface S3 is convex, and the second side surface S4 is convex.

[0098] The third lens L3 has positive optical power, the first side surface S5 is convex, and the second side surface S6 is concave.

[0099] The fourth lens L4 has positive optical power, the first side surface S7 is convex, and the second side surface S8 is convex.

[0100] The fifth lens L5 has positive optical power, with the first side surface S9 being convex and the second side surface S10 being convex.

[0101] The sixth lens L6 has negative optical power, with the first side surface S11 being concave and the second side surface S12 being concave.

[0102] The seventh lens L7 has positive optical power, with the first side surface S13 being convex and the second side surface S14 being concave.

[0103] The eighth lens L8 has negative optical power, with the first side surface S15 being concave and the second side surface S16 being concave.

[0104] An image plane IMA is provided on the second side of the optical lens. When the IMA is the imaging plane, light from the object passes through each surface sequentially and is finally imaged onto 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. A filter and a protective glass are sequentially disposed between the eighth lens L8 and the image plane IMA. The filter has a first side surface S17 and a second side surface S18. The protective glass has a first side surface S19 and a second side surface S20.

[0105] Table 1 shows the basic parameters of the optical lens of Example 1.

[0106] Table 1

[0107] In Embodiment 1, the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8 are all aspherical surfaces. The surface shape of each aspherical surface can be defined using, but is not limited to, the following aspherical surface formula:

[0108] 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 (that is, 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.

[0109] Table 2 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24 and A26 that can be used for each aspherical surface in Example 1.

[0110] Table 2

[0111] Figure 13 In the diagram, T represents the meridian / tangential direction, and S represents the sagittal direction. Figure 13 The MTF values ​​of the optical lens of Example 1 are shown at three different field of view angles: 0°, 18°, and 24°. Figure 13The MTF peaks in the meridional / tangential and sagittal directions of the 0° field of view coincide. (This is due to...) Figure 13 As shown, the optical lens of Embodiment 1 achieves an MTF peak value of over 0.8 at a spatial frequency of 119 p / mm, a MTF peak value of over 0.7 at the center 0° field of view, and an MTF peak value of over 0.6 at the edge 18° field of view. A conventional 8-megapixel automotive lens sensor has a pixel unit size of 2.1 μm × 2.1 μm and a target surface diagonal size of 9.25 mm; while the sensor of this application maintains the same pixel unit size, but the target surface diagonal size is increased to over 13.6 mm. Therefore, the lens of this application can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels).

[0112] Figure 14 The diagram shows the axial chromatic aberration values ​​for each wavelength of light (650nm, 610nm, 510nm, and 440nm) under normalized pupil coordinates of the optical lens of Example 1. Normalized pupil coordinates are coordinates normalized to a unit circle around the entrance pupil (aperture), used to mark the position where a ray of light passes through the aperture, and are independent of the actual aperture diameter of the optical lens. Figure 14 The black dashed line in the diagram serves as the baseline. Figure 14 As shown, at the normalized pupil coordinate (ordinate) of the optical lens in Example 1, at 0.707, the axial chromatic aberration values ​​for the 510nm, 650nm, and 440nm bands are -0.001458mm, 0.00542mm, and 0.001416mm, respectively. The difference between the 650nm and 510nm bands is 6.878μm, and the difference between the 440nm and 510nm bands is 2.874μm. Based on these difference values, it can be shown that the optical lens of Example 1 has small axial chromatic aberration values ​​in all bands. Therefore, the optical lens provided in Example 1 has good imaging performance in both infrared and visible light.

[0113] Figure 15 In the diagram, T represents the meridian / tangential direction, and S represents the sagittal direction. Figure 15 The black dashed line in the diagram is the baseline. Figure 15 The MTF values ​​of the optical lens of Example 1 are shown at various field-of-view angles of 0°, 3°, 6°, 9°, 15°, 18°, 21°, and 24°. (From...) Figure 15 It is known that, within the core field of view near the center, the optimal imaging focal planes of each field of view of the optical lens of this application basically coincide, and the residual field curvature and astigmatism are small; the optical system has a wide defocus tolerance range and is not sensitive to image plane drift caused by assembly errors and temperature, which is conducive to improving the yield of mass production.

[0114] Example 2 The following is for reference Figure 2 Describes an optical lens according to Embodiment 2 of this application.

[0115] like Figure 2 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. The first side surface S3 of the second lens L2 is concave, the second side surface S6 of the third lens L3 is convex, and the second side surface S14 of the seventh lens L7 is convex. The aperture stop STO is disposed between the third lens L3 and the fourth lens L4. In Embodiment 2, there are no cemented lenses among the first lens L1 to the eighth lens L8.

[0116] Table 3 shows the basic parameters of the optical lens in Example 2.

[0117] Table 3

[0118] Table 4 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 and A22 that can be used for each aspherical surface in Example 2 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0119] Table 4

[0120] The optical lens of Example 2 achieves a normalized MTF peak value of 0.8 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.7 or higher at a normalized field of view, and a normalized MTF peak value of 1 or higher at a normalized field of view. The optical lens provided in Example 2 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 2 are comparable to those of Example 1.

[0121] Example 3 The following is for reference Figure 3 The optical lens according to Embodiment 3 of this application is described.

[0122] like Figure 3As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. The first side surface S1 of the first lens L1 is convex, the second side surface S6 of the third lens L3 is convex, and the second side surface S14 of the seventh lens L7 is convex. The first side surface S1 of the first lens L1 has at least one inflection point. The aperture stop STO is disposed between the third lens L3 and the fourth lens L4.

[0123] Table 5 shows the basic parameters of the optical lens of Example 3.

[0124] Table 5

[0125] Table 6 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface in Example 3 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0126] Table 6

[0127] The optical lens of Example 3 achieves a normalized MTF peak value of over 0.82 at a spatial frequency of 119 p / mm, a normalized MTF peak value of over 0.7 at a normalized 0.7 field of view, and a normalized MTF peak value of over 0.6 at a normalized 1 field of view. The optical lens provided in Example 3 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 3 are comparable to those of Example 1. Example 4 The following is for reference Figure 4 The optical lens according to Embodiment 4 of this application is described.

[0128] like Figure 4 As shown, the main difference between this embodiment and Embodiment 1 lies in the optical parameters such as the central radius of curvature and lens thickness of each lens surface. The first side surface S1 of the first lens L1 is convex, the first side surface S5 of the third lens L3 is concave, the second side surface S6 of the third lens L3 is convex, the second side surface S10 of the fifth lens L5 is concave, the first side surface S11 of the sixth lens L6 is convex, and the second side surface S16 of the eighth lens L8 is convex. The aperture stop STO is positioned between the third lens L3 and the fourth lens L4. The first side surface S1 of the first lens L1 has at least one inflection point.

[0129] Table 7 shows the basic parameters of the optical lens in Example 4.

[0130] Table 7

[0131] Table 8 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 and A24 for each aspherical surface in Example 4 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0132] Table 8

[0133] The optical lens of Example 4 achieves a normalized MTF peak value of over 0.75 at a spatial frequency of 119 p / mm, a normalized MTF peak value of over 0.67 at a normalized 0.7 field of view, and a normalized MTF peak value of over 0.6 at a normalized 1 field of view. The optical lens provided in Example 4 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 4 are comparable to those of Example 1. Example 5 The following is for reference Figure 5 The optical lens according to Embodiment 5 of this application is described.

[0134] like Figure 5 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. The first side surface S1 of the first lens L1 is convex, and the second side surface S14 of the seventh lens L7 is convex. The first side surface S1 of the first lens L1 has at least one inflection point. The aperture stop STO is disposed between the third lens L3 and the fourth lens L4.

[0135] Table 9 shows the basic parameters of the optical lens of Example 5.

[0136] Table 9

[0137] Table 10 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 for each aspherical surface in Example 5 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0138] Table 10

[0139] The optical lens of Example 5 achieves a normalized MTF peak value of 0.82 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.7 or higher at a normalized field of view, and a normalized MTF peak value of 0.6 or higher at a normalized field of view. The optical lens provided in Example 5 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 5 are comparable to those of Example 1. Example 6 The following is for reference Figure 6 The optical lens according to Embodiment 6 of this application is described.

[0140] like Figure 6 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. The first side surface S1 of the first lens L1 is convex, and the second side surface S14 of the seventh lens L7 is convex. The first side surface S1 of the first lens L1 has at least one inflection point. The aperture stop STO is positioned between the third lens L3 and the fourth lens L4.

[0141] Table 11 shows the basic parameters of the optical lens of Example 6.

[0142] Table 11

[0143] Table 12 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface in Example 6 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0144] Table 12

[0145] The optical lens of Example 6 achieves a normalized MTF peak value of 0.8 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.7 or higher at a normalized field of view, and a normalized MTF peak value of 0.6 or higher at a normalized field of view. The optical lens provided in Example 6 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 6 are comparable to those of Example 1. Example 7 The following is for reference Figure 7 The optical lens according to Embodiment 7 of this application is described.

[0146] like Figure 7 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. The eighth lens L8 has positive optical power, and the first side surface S15 of the eighth lens L8 is convex. The aperture stop STO is disposed between the third lens L3 and the fourth lens L4.

[0147] Table 13 shows the basic parameters of the optical lens of Example 7.

[0148] Table 13

[0149] Table 14 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 and A22 that can be used for each aspherical surface in Example 7 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0150] Table 14

[0151] The optical lens of Example 7 achieves a normalized MTF peak value of 0.8 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.7 or higher at a normalized field of view, and a normalized MTF peak value of 0.55 or higher at a normalized field of view. The optical lens provided in Example 7 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 7 are comparable to those of Example 1. Example 8 The following is for reference Figure 8 The optical lens according to Embodiment 8 of this application is described.

[0152] like Figure 8 As shown, the main difference between this embodiment and Embodiment 1 lies in the optical parameters such as the central radius of curvature and lens thickness of each lens surface. The first side surface S3 of the second lens L2 is concave, the second side surface S6 of the third lens L3 is convex, the first side surface S7 of the fourth lens L4 is concave, the second side surface S10 of the fifth lens L5 is concave, and the first side surface S11 of the sixth lens L6 is convex. An aperture stop STO is positioned between the third lens L3 and the fourth lens L4. The sixth lens L6 and the seventh lens L7 are cemented together to form a cemented lens.

[0153] Table 15 shows the basic parameters of the optical lens of Example 8.

[0154] Table 15

[0155] Table 16 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 and A22 that can be used for each aspherical surface in Example 8 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0156] Table 16

[0157] The optical lens of Example 8 achieves a normalized MTF peak value of 0.8 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.7 or higher at a normalized MTF peak value of 0.7 or higher at a normalized MTF peak value of 1 or higher at a normalized MTF peak value of 1 higher at a spatial frequency of 119 p / mm. The optical lens provided in Example 8 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and has small axial chromatic aberration values ​​in all wavelengths, exhibiting good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 8 are comparable to those of Example 1. Example 9 The following is for reference Figure 9 The optical lens according to Embodiment 9 of this application is described.

[0158] like Figure 9As shown, the main difference between this embodiment and Embodiment 1 lies in the optical parameters such as the central radius of curvature and lens thickness of each lens surface. The first side surface S1 of the first lens L1 is convex; the fifth lens L5 has negative optical power, with its first side surface S9 being concave and its second side surface S10 being concave; the sixth lens L6 has positive optical power, with its first side surface S11 being convex; and the second side surface S14 of the seventh lens L7 is convex. An aperture stop STO is positioned between the third lens L3 and the fourth lens L4. The first side surface S1 of the first lens L1 has at least one inflection point. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens.

[0159] Table 17 shows the basic parameters of the optical lens of Example 9.

[0160] Table 17

[0161] Table 18 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24 and A26 that can be used for each aspherical surface in Embodiment 9 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0162] Table 18

[0163] The optical lens of Example 9 achieves a normalized MTF peak value of 0 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.73 or higher at a normalized 0.7 field of view, and a normalized MTF peak value of 0.63 or higher at a normalized 1 field of view. The optical lens provided in Example 9 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 9 are comparable to those of Example 1. Example 10 The following is for reference Figure 10 The optical lens according to Embodiment 10 of this application is described.

[0164] like Figure 10As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. The second side surface S6 of the third lens L3 is convex, the second side surface S8 of the fourth lens L4 is concave, and the second side surface S14 of the seventh lens L7 is convex. The aperture stop STO is disposed between the third lens L3 and the fourth lens L4.

[0165] Table 19 shows the basic parameters of the optical lens of Example 10.

[0166] Table 19

[0167] Table 20 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24 and A26 that can be used for each aspherical surface in Embodiment 10 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0168] Table 20

[0169] The optical lens of Embodiment 10 achieves a normalized MTF peak value of 0 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.69 or higher at a normalized 0.7 field of view, and a normalized MTF peak value of 0.66 or higher at a normalized 1 field of view. The optical lens provided in Embodiment 10 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and exhibits small axial chromatic aberration values ​​across all wavelengths, demonstrating good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Embodiment 10 are comparable to those of Embodiment 1. Example 11 The following is for reference Figure 11 The optical lens according to Embodiment 11 of this application is described.

[0170] like Figure 11 As shown, the main difference between this embodiment and Embodiment 1 lies in the optical parameters such as the central radius of curvature and lens thickness of each lens surface. The fifth lens L5 has negative optical power, with its first side surface S9 being concave and its second side surface S10 being concave. The sixth lens L6 has positive optical power, with its first side surface S11 being convex. The eighth lens L8 has positive optical power, with its first side surface S15 being convex. The first side surface S15 of the eighth lens L8 has at least one inflection point. The fourth lens L4, the fifth lens L5, and the sixth lens L6 are cemented together to form a cemented lens.

[0171] Table 21 shows the basic parameters of the optical lens of Example 11.

[0172] Table 21

[0173] Table 22 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface in Example 11 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0174] Table 22

[0175] The optical lens of Embodiment 11 achieves a normalized MTF peak value of 0.8 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.7 or higher at a normalized MTF peak value of 0.7 or higher at a normalized MTF peak value of 1 or higher at a normalized MTF peak value of 1 higher at a spatial frequency of 119 p / mm. The optical lens provided in Embodiment 11 can achieve imaging quality of 12 megapixels and higher (e.g., 17 megapixels), and has small axial chromatic aberration values ​​in all wavelengths, exhibiting good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Embodiment 11 are comparable to those of Embodiment 1. Example 12 The following is for reference Figure 12 The optical lens according to Embodiment 12 of this application is described.

[0176] like Figure 12 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. The first side surface S1 of the first lens L1 is convex. The first side surface S1 of the first lens L1 has at least one inflection point.

[0177] Table 23 shows the basic parameters of the optical lens of Example 12.

[0178] Table 23

[0179] Table 24 provides the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24 and A26 that can be used for each aspherical surface in Example 12 (such as the first side surface S1 and the second side surface S2 of the first lens L1, and the first side surface S15 and the second side surface S16 of the eighth lens L8).

[0180] Table 24

[0181] The optical lens of Example 12 achieves a normalized MTF peak value of 0.84 or higher at a spatial frequency of 119 p / mm, a normalized MTF peak value of 0.7 or higher at a normalized MTF peak value of 0.7 or higher at a normalized MTF peak value of 1 higher at a normalized MTF peak value of 1 higher at a spatial frequency of 119 p / mm. The optical lens provided in Example 12 can achieve imaging quality of 12 megapixels or higher (e.g., 17 megapixels), and has small axial chromatic aberration values ​​in all wavelengths, exhibiting good imaging performance in both infrared and visible light. The axial chromatic aberration and defocus tolerance range of the optical lens provided in Example 12 are comparable to those of Example 1.

[0182] Tables 25-1 and 25-2 provide the basic parameters of the optical lenses in Examples 1-12.

[0183] Table 25-1 Basic parameters of the optical lenses in Examples 1-6

[0184] Table 25-2 Basic parameters of the optical lenses in Examples 7-12

[0185] In summary, the relationships in each embodiment of Examples 1-12 satisfy the relationships shown in Tables 26-1 and 26-2.

[0186] Table 26-1

[0187] Table 26-2

[0188] This application also provides an electronic device, which includes a first device and / or 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., disposed on the imaging surface). The imaging element may be, for example, a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS). The light from the first side is imaged on the second side after passing through the optical lens.

[0189] 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 negative optical power has a concave second side surface; A second lens with positive optical power, the second side of which is convex; A third lens with positive optical power; A fourth lens with positive optical power; A fifth lens with optical power; A sixth lens having optical power opposite to that of the fifth lens; The seventh lens with positive optical power has a convex first side surface; An eighth lens with optical power; The optical lens has eight lenses with optical power. The optical lens satisfies the following conditions: -1.5≤F1 / F≤-0.4, 1.65≤Nd1≤2.1, 1.9≤Nd3≤2.1, 35≤Vd2≤100 and 0.055≤TTL / H / FOV×1°≤0.08; Wherein, F1 is the focal length of the first lens, F is the total focal length of the optical lens group, Nd1 is the refractive index of the first lens, Nd3 is the refractive index of the third 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, and Vd2 is the Abbe number of the second lens.

2. The optical lens according to claim 1, characterized in that, The optical lens must satisfy at least one of the following: The fifth lens has positive optical power and its first side is convex, and the sixth lens has negative optical power and its second side is concave; or, the fifth lens has negative optical power, its first side is concave, its second side is concave, and the sixth lens has positive optical power, its first side is convex, and its second side is concave. The eighth lens has negative optical power and its first side surface is concave; or, the eighth lens has positive optical power, its first side surface is convex and its second side surface is concave. The fourth lens and the fifth lens are cemented together to form a cemented lens; or, the fifth lens and the sixth lens are cemented together to form a cemented lens; or, the sixth lens and the seventh lens are cemented together to form a cemented lens; or, the fourth lens, the fifth lens, and the sixth lens are cemented together to form a cemented lens. The first and second side surfaces of the first lens and the first and second side surfaces of the eighth lens are both aspherical surfaces. The optical lens further includes an aperture stop, which is disposed between the fourth lens and the fifth lens, or between the third lens and the fourth lens.

3. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F2 of the second lens satisfies the following condition with the total focal length F of the optical lens: 0.65≤F2 / F≤2.

4.

4. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F3 of the third lens and the total focal length F of the optical lens satisfy the following condition: 1.5≤F3 / F≤5.

5. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F4 of the fourth lens satisfies the following condition with the total focal length F of the optical lens: 0.15≤F4 / F≤7.

6. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy the following condition: 0.15≤F7 / F≤2.

65.

7. The optical lens according to any one of claims 1 to 2, characterized in that, The total 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: 1.1≤F / H≤1.

3.

8. The optical lens according to any one of claims 1 to 2, characterized in that, The image height H corresponding to the maximum field angle of the optical lens, the overall focal length F of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy: 0<|(H-F×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.

07.

9. The optical lens according to any one of claims 1 to 2, characterized in that, The central radius of curvature R22 of the second side of the second lens and the central radius of curvature R31 of the first side of the third lens satisfy: -1.7≤(R22+R31) / (R22-R31)≤0.

7.

10. The optical lens according to any one of claims 1 to 2, characterized in that, The total optical length TTL of the optical lens and the overall focal length F of the optical lens satisfy: 2≤TTL / F≤3.

11. The optical lens according to any one of claims 1 to 2, characterized in that, The image height H corresponding to the maximum field angle of the optical lens, the overall focal length F of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy: 0.85≤(H / 2) / (F×tan(θ / 2))≤1.

12. The optical lens according to any one of claims 1 to 2, characterized in that, The central thickness CT7 of the seventh lens and the central radius of curvature R71 of the first side of the seventh lens satisfy: 0<CT7 / R71≤1.

75.

13. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F1 of the first lens and the focal length F2 of the second lens satisfy: -1≤F1 / F2≤-0.

42.

14. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F2 of the second lens, the focal length F3 of the third lens, and the focal length F4 of the fourth lens satisfy: 0.3≤(F2+F4) / F3≤6.

15. The optical lens according to any one of claims 1 to 2, characterized in that, The central thickness CT8 of the eighth lens and the overall focal length F of the optical lens satisfy 0.08≤CT8 / F≤0.

25.

16. The optical lens according to any one of claims 1 to 2, characterized in that, The optical lens satisfies at least one of the following relational expressions: 55≤(FOV×F) / H / 1°≤62, F / F8≤0.18, 6.5≤(Nd1×Vd2×Nd3) / F×1mm≤17, 0≤(R32-R41) / (R32+R41)≤6, 0.95≤D31 / D81≤1.75, 50≤Vd2≤95, 1.6820≤Nd1≤2.0020, 1.923≤Nd3≤2.001, 0.8≤D31 / D71≤2.2, 0.8≤(F×θ) / D11 / rad≤1.1, 1.5≤F / ENPD≤1.9, 0<CT1 / R12≤0.55, 0.4≤CT2 / CT3≤2.5, 0.1≤T78 / CT7≤6.5, -4≤F5 / F6≤-0.1, 0.055≤BFL / TTL≤0.08, 0.11≤CT2 / F2≤0.35, -0.1≤R22 / (CT2-R21)≤1.45 or 0.015≤T34 / CT2≤1.15; Wherein, F8 is the focal length of the eighth lens, R32 is the central radius of curvature of the second side of the third lens, R41 is the central radius of curvature of the first side of the fourth lens, D31 is the maximum aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens, D81 is the maximum aperture of the first side of the eighth lens corresponding to the maximum field of view of the optical lens, D71 is the maximum aperture of the first side of the seventh lens corresponding to the maximum field of view of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, D11 is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, and ENPD is the focal length of the optical lens. The entrance pupil diameter of the lens is defined as follows: CT1 is the center thickness of the first lens; R12 is the center radius of curvature of the second side surface of the first lens; CT2 is the center thickness of the second lens; CT3 is the center thickness of the third lens; T78 is the air gap between the seventh and eighth lenses; CT7 is the center thickness of the seventh lens; F5 is the focal length of the fifth lens; F6 is the focal length of the sixth lens; BFL is the optical back focal length of the optical lens; F2 is the focal length of the second lens; R22 is the center radius of curvature of the second side surface of the second lens; R21 is the center radius of curvature of the first side surface of the second lens; and T34 is the air gap between the third and fourth lenses.

17. The optical lens according to any one of claims 1 to 2, characterized in that, The optical lens must satisfy at least one of the following relationships: 56.522≤(FOV×F) / H / 1°≤60.214, 52.68≤Vd2≤71.30, 2.348≤TTL / F≤2.821, 0.061≤TTL / H / FOV×1°≤0.072, 0. 86≤(F×θ) / D11 / rad≤1.012, 0.06≤BFL / TTL≤0.072, 1.178≤F / H≤1.252, 1.61≤F / ENPD≤1.8, 0.004<|(HF×θ) / ( F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.048, 0.895≤(H / 2) / (F×tan(θ / 2))≤0.954, -1.24≤F1 / F≤-0.669, 0 .995≤F2 / F≤2.033, 1.784≤F3 / F≤4.127, 0.644≤F4 / F≤5.442, 0.7≤F7 / F≤2.364, 8.055≤(Nd1×Vd2×Nd3) / F×1m m≤14.296, -1.235≤(R22+R31) / (R22-R31)≤0.217, 0.181≤(R32-R41) / (R32+R41)≤4.023, 1.108≤D31 / D81≤ 1.476, 1.1≤D31 / D71≤1.85, 0.007≤CT1 / R12≤0.316, 0.845≤CT2 / CT3≤2.049, 0.322≤T78 / CT7≤0.755, 0.101≤ CT7 / R71≤1.093, -0.901≤F1 / F2≤-0.458, 0.748≤(F2+F4) / F3≤4.131, -2.847≤F5 / F6≤-0.217, 0.119≤CT2 / F2≤0.302, -0.178≤R22 / (CT2-R21)≤1.428, 0.017≤T34 / CT2≤0.558, 0.094≤CT8 / F≤0.216 or -1.2≤F / F8≤0.169; Wherein, θ is the radian value corresponding to the maximum field of view of the optical lens, D11 is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F7 is the focal length of the seventh lens, R22 is the central radius of curvature of the second side of the second lens, R31 is the central radius of curvature of the first side of the third lens, R32 is the central radius of curvature of the second side of the third lens, R41 is the central radius of curvature of the first side of the fourth lens, D31 is the maximum aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens, and D81 is the maximum aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens. The maximum aperture of the first side of the eighth lens corresponds to D71, which is the maximum aperture of the first side of the seventh lens corresponding to the maximum field of view of the optical lens. CT1 is the center thickness of the first lens, R12 is the center radius of curvature of the second side of the first lens, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, T78 is the air gap between the seventh lens and the eighth lens, CT7 is the center thickness of the seventh lens, R71 is the center radius of curvature of the first side of the seventh lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, R21 is the center radius of curvature of the first side of the second lens, T34 is the air gap between the third lens and the fourth lens, CT8 is the center thickness of the eighth lens, and F8 is the focal length of the eighth lens.

18. An electronic device, characterized in that, include: Optical lens according to any one of claims 1 to 17; 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