Optical lenses and electronic equipment

Abstract

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

Description

Technical Field

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

[0002] In recent years, with the rapid development of automobile assisted driving systems, vehicle-mounted lenses have become the eyes of automobiles to obtain external information, playing an irreplaceable role. In order to enable vehicle-mounted lenses to obtain information more accurately, optical lenses need to be equipped with larger and higher-resolution chips to improve the resolution quality of the lenses.

[0003] Usually, in order to meet the requirements of higher image quality, more lens structures are often chosen in the market. However, this will lead to an increase in costs and will also seriously affect the miniaturization of the lens. For safety reasons, vehicle-mounted lenses used in the field of autonomous driving have high requirements for stability and need to be able to cope with various harsh environments to avoid significant degradation of lens performance in different environments. In particular, traffic light recognition technology is one of the applications of vehicle-mounted lenses in urban road detection. In order to accurately identify traffic lights of different colors, the lens itself needs to have good chromatic aberration. Summary of the invention

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

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

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

[0007] In one embodiment, the fifth lens element has negative optical power, and its object-side surface is concave, and its image-side surface is concave.

[0008] In one embodiment, the fifth lens element has negative optical power, and its object-side surface is convex and its image-side surface is concave.

[0009] In one embodiment, the fifth lens element has positive refractive power, and its object-side surface is convex, and its image-side surface is convex.

[0010] In one embodiment, the sixth lens has positive refractive power, and its object-side surface is convex and its image-side surface is convex.

[0011] In one embodiment, the sixth lens has negative optical power, and its object-side surface is concave, and its image-side surface is concave.

[0012] In one embodiment, the seventh lens element has positive refractive power, and its object-side surface is convex in a region close to the optical axis, and its image-side surface is concave in a region close to the optical axis.

[0013] In one embodiment, the seventh lens element has negative refractive power, and its object-side surface is concave in a region close to the optical axis, and its image-side surface is convex in a region close to the optical axis.

[0014] In one embodiment, the seventh lens element has negative refractive power, and its object-side surface is concave in a region close to the optical axis, and its image-side surface is concave in a region close to the optical axis.

[0015] In one embodiment, the seventh lens element has positive refractive power, and its object-side surface is convex in a region close to the optical axis, and its image-side surface is convex in a region close to the optical axis.

[0016] In one embodiment, there is at least one inflection point on the object-side surface of the seventh lens and the image-side surface of the seventh lens.

[0017] In one embodiment, at least two lenses among the second lens, the third lens, the fourth lens and the seventh lens have aspherical mirror surfaces.

[0018] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens may satisfy: TTL / F≤9.

[0019] In one embodiment, the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens may satisfy: TTL / H / FOV≤0.1.

[0020] In one embodiment, the maximum light clearance aperture D of the object side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens may satisfy: D / H / FOV≤0.025.

[0021] In one embodiment, the effective focal length F+ of the lens with positive power in the cemented lens and the effective focal length F- of the lens with negative power in the cemented lens may satisfy: 0.5≤|F+ / F-|≤3.

[0022] In one embodiment, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens may satisfy: |F7 / F|≥1.5.

[0023] In one embodiment, a distance T67 between the sixth lens and the seventh lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: 0≤T67 / TTL≤0.2.

[0024] In one embodiment, a curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens on the optical axis may satisfy: |R3-R4-d3|≥1.5 mm.

[0025] In one embodiment, the center thickness d3 of the second lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: 0.05≤d3 / TTL≤0.3.

[0026] In one embodiment, the maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens may satisfy: (FOV×F) / H≤70.

[0027] In one embodiment, the semi-aperture D3 of the maximum clear aperture of the object side surface of the second lens corresponding to the maximum field angle of the optical lens, the distance SAG3 from the intersection of the object side surface of the second lens and the optical axis to the maximum clear aperture of the object side surface of the second lens on the optical axis, the semi-aperture D4 of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field angle of the optical lens, and the distance SAG4 from the intersection of the image side surface of the second lens and the optical axis to the maximum clear aperture of the image side surface of the second lens on the optical axis may satisfy the following: 0.5≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤3.

[0028] In one embodiment, the refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens may satisfy: Vd+ / Nd+≥40.

[0029] On the other hand, the present application provides such an optical lens. The optical lens includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens with negative optical power, whose object side surface is concave and whose image side surface is convex; a third lens with positive optical power, whose object side surface is convex; a fourth lens with positive optical power, whose object side surface is convex and whose image side surface is convex; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with optical power; wherein the interval T67 between the sixth lens and the seventh lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis can satisfy: 0≤T67 / TTL≤0.2.

[0030] In one embodiment, one of the fifth lens and the sixth lens has positive power, the other of the fifth lens and the sixth lens has negative power, and the fifth lens and the sixth lens are cemented to form a cemented lens.

[0031] In one embodiment, the image-side surface of the third lens is convex.

[0032] In one embodiment, the image-side surface of the third lens is concave.

[0033] In one embodiment, the fifth lens element has negative optical power, and its object-side surface is concave, and its image-side surface is concave.

[0034] In one embodiment, the fifth lens element has negative optical power, and its object-side surface is convex and its image-side surface is concave.

[0035] In one embodiment, the fifth lens element has positive refractive power, and its object-side surface is convex, and its image-side surface is convex.

[0036] In one embodiment, the sixth lens has positive refractive power, and its object-side surface is convex and its image-side surface is convex.

[0037] In one embodiment, the sixth lens has negative optical power, and its object-side surface is concave, and its image-side surface is concave.

[0038] In one embodiment, the seventh lens element has positive refractive power, and its object-side surface is convex in a region close to the optical axis, and its image-side surface is concave in a region close to the optical axis.

[0039] In one embodiment, the seventh lens element has negative refractive power, and its object-side surface is concave in a region close to the optical axis, and its image-side surface is convex in a region close to the optical axis.

[0040] In one embodiment, the seventh lens element has negative refractive power, and its object-side surface is concave in a region close to the optical axis, and its image-side surface is concave in a region close to the optical axis.

[0041] In one embodiment, the seventh lens element has positive refractive power, and its object-side surface is convex in a region close to the optical axis, and its image-side surface is convex in a region close to the optical axis.

[0042] In one embodiment, there is at least one inflection point on the object-side surface of the seventh lens and the image-side surface of the seventh lens.

[0043] In one embodiment, at least two lenses among the second lens, the third lens, the fourth lens and the seventh lens have aspherical mirror surfaces.

[0044] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens may satisfy: TTL / F≤9.

[0045] In one embodiment, the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens may satisfy: TTL / H / FOV≤0.1.

[0046] In one embodiment, the maximum field of view FOV of the optical lens, the maximum light clearance D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens may satisfy: D / H / FOV≤0.025.

[0047] In one embodiment, the effective focal length F+ of the lens with positive power in the cemented lens and the effective focal length F- of the lens with negative power in the cemented lens may satisfy: 0.5≤|F+ / F-|≤3.

[0048] In one embodiment, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens may satisfy: |F7 / F|≥1.5.

[0049] In one embodiment, a curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens on the optical axis may satisfy: |R3-R4-d3|≥1.5 mm.

[0050] In one embodiment, the center thickness d3 of the second lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: 0.05≤d3 / TTL≤0.3.

[0051] In one embodiment, the maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view FOV of the optical lens may satisfy: (FOV×F) / H≤70.

[0052] In one embodiment, the semi-aperture D3 of the maximum clear aperture of the object side surface of the second lens corresponding to the maximum field angle of the optical lens, the distance SAG3 from the intersection of the object side surface of the second lens and the optical axis to the maximum clear aperture of the object side surface of the second lens on the optical axis, the semi-aperture D4 of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field angle of the optical lens, and the distance SAG4 from the intersection of the image side surface of the second lens and the optical axis to the maximum clear aperture of the image side surface of the second lens on the optical axis may satisfy the following: 0.5≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤3.

[0053] In one embodiment, the refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens may satisfy: Vd+ / Nd+≥40.

[0054] Another aspect of the present application provides an electronic device, which includes the optical lens provided by the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0055] The present application adopts seven lenses, and by optimizing the shape, optical focal length, etc. of each lens, the optical lens has at least one beneficial effect of high resolution, miniaturization, small distortion, low cost, and good temperature performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0057] Figure 1 A schematic diagram showing the structure of an optical lens according to Embodiment 1 of the present application;

[0058] Figure 2 A schematic diagram showing the structure of an optical lens according to Embodiment 2 of the present application;

[0059] Figure 3 A schematic diagram showing the structure of an optical lens according to Embodiment 3 of the present application;

[0060] Figure 4 A schematic diagram showing the structure of an optical lens according to Embodiment 4 of the present application;

[0061] Figure 5 A schematic diagram showing the structure of an optical lens according to Embodiment 5 of the present application;

[0062] Figure 6 A schematic diagram showing the structure of an optical lens according to Embodiment 6 of the present application;

[0063] Figure 7A schematic diagram showing the structure of an optical lens according to Embodiment 7 of the present application;

[0064] Figure 8 A schematic diagram showing the structure of an optical lens according to Embodiment 8 of the present application; and

[0065] Fig. 9 Schematic diagram showing the sagittal height of the object side surface of the lens according to the present application. DETAILED DESCRIPTION

[0066] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0067] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0068] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0069] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens.

[0070] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0071] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0072] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0073] The features, principles and other aspects of the present application are described in detail below.

[0074] In an exemplary embodiment, the optical lens includes, for example, seven lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in sequence from the object side to the image side along the optical axis.

[0075] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0076] In an exemplary embodiment, the first lens may have a negative optical power. The first lens may have a convex-concave surface. This optical power setting of the first lens can prevent the object-side light from being too divergent, which is beneficial to controlling the aperture of the rear lens and realizing a miniaturized design. This surface setting of the first lens can collect as much light of a large field of view as possible, enter the rear optical system, and increase the amount of light passing through. The object side of the first lens is designed to be convex, which is beneficial to the sliding of water droplets in actual use environments such as rainy and snowy weather, reducing the impact on imaging. Preferably, the first lens has a higher refractive index (such as Nd1≥1.7) and a higher hardness, which is beneficial to reducing the front port aperture and improving the imaging quality.

[0077] In an exemplary embodiment, the second lens may have a negative optical power. The second lens may have a concave-convex surface. Such an optical power setting of the second lens is conducive to further diverging the light passing through the first lens. Such a surface setting of the second lens is conducive to a smooth transition of the light to the rear optical system. Preferably, the second lens has an aspherical mirror surface, which can improve the lens resolution.

[0078] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex-convex surface type or a convex-concave surface type. Such optical power and surface type of the third lens are conducive to light convergence. The third lens is preferably made of a high refractive index material (Nd3≥1.65), which is conducive to reducing the front port diameter and improving the imaging quality. Preferably, the third lens has an aspherical mirror surface, which can improve the lens resolution.

[0079] In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex-convex surface. Such optical power and surface configuration of the fourth lens is conducive to converging light and making the light smoothly transition to the rear optical system. By controlling the effective focal length of the fourth lens, the light trend from the first lens to the fourth lens can be controlled, making the system structure compact. Preferably, the fourth lens has an aspherical surface.

[0080] Mirror can improve the resolution of the lens.

[0081] In an exemplary embodiment, the seventh lens may have positive power or negative power. The seventh lens may have a concave-convex, convex-concave, convex-convex or concave-concave surface type. Preferably, the seventh lens has an aspherical mirror surface, which can further improve the resolution quality and correct aberrations.

[0082] In an exemplary embodiment, at least two lenses among the second lens, the third lens, the fourth lens, and the seventh lens may have an aspherical mirror surface, which may improve lens resolution.

[0083] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / F≤9, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F may further satisfy: TTL / F≤8.5. Satisfying TTL / F≤9 is conducive to miniaturization.

[0084] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / H / FOV≤0.1, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. More specifically, TTL, H and FOV may further satisfy: TTL / H / FOV≤0.05. Satisfying TTL / H / FOV≤0.1 is conducive to miniaturization, and can make the lens size smaller under the same imaging surface and the same image height.

[0085] In an exemplary embodiment, the optical lens according to the present application may satisfy: D / H / FOV≤0.025, where D is the maximum aperture of the object side of the first lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. More specifically, D, H, and FOV may further satisfy: D / H / FOV≤0.02. Satisfying D / H / FOV≤0.025 is conducive to a smaller front port diameter.

[0086] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤|F+ / F-|≤3, where F+ is the effective focal length of the lens with positive power in the cemented lens, and F- is the effective focal length of the lens with negative power in the cemented lens. More specifically, F+ and F- may further satisfy: 0.8≤|F+ / F-|≤2.5. Satisfying 0.5≤|F+ / F-|≤3 makes the focal length values ​​of the lenses in the cemented part similar, which helps to smoothly transition the light and correct chromatic aberration.

[0087] In an exemplary embodiment, the optical lens according to the present application may satisfy: |F7 / F|≥1.5, where F7 is the effective focal length of the seventh lens and F is the total effective focal length of the optical lens. More specifically, F7 and F may further satisfy: |F7 / F|≥2. Satisfying |F7 / F|≥1.5 is helpful in correcting chromatic aberration.

[0088] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0≤T67 / TTL≤0.2, wherein T67 is the distance between the sixth lens and the seventh lens on the optical axis, and TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, T67 and TTL may further satisfy: 0.01≤T67 / TTL≤0.1. Satisfying 0≤T67 / TTL≤0.2 facilitates the assembly of the optical lens and helps improve ghost images.

[0089] In an exemplary embodiment, the optical lens according to the present application may satisfy: |R3-R4-d3|≥1.5mm, where R3 is the radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens, and d3 is the center thickness of the second lens on the optical axis. More specifically, R3, R4 and d3 may further satisfy: |R3-R4-d3|≥1.8mm. Satisfying |R3-R4-d3|≥1.5mm helps to smoothly transition the light and facilitates processing.

[0090] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.05≤d3 / TTL≤0.3, wherein d3 is the center thickness of the second lens on the optical axis, and TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, d3 and TTL may further satisfy: 0.1≤d3 / TTL≤0.25. Satisfying 0.05≤d3 / TTL≤0.3 helps light to pass smoothly through the second lens.

[0091] In an exemplary embodiment, the optical lens according to the present application may satisfy: (FOV×F) / H≤70, where FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. More specifically, FOV, F, and H may further satisfy: (FOV×F) / H≤65. Satisfying (FOV×F) / H≤70 is conducive to the optical lens having less distortion and can match a larger chip.

[0092] like Fig. 9 A schematic diagram of the vector height SAG of the object side surface S of the lens E of the present application is shown. D is the half-aperture of the maximum clear aperture of the object side surface S of the lens E corresponding to the maximum field angle of the optical lens, and the vector height SAG is the distance A on the optical axis from the intersection a of the object side surface S of the lens E and the optical axis to the maximum clear aperture of the object side surface S of the lens E. In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤3, wherein D3 is the half-aperture of the maximum clear aperture of the object side surface of the second lens corresponding to the maximum field angle of the optical lens, SAG3 is the distance on the optical axis from the intersection of the object side surface of the second lens and the optical axis to the maximum clear aperture of the object side surface of the second lens, D4 is the half-aperture of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field angle of the optical lens, and SAG4 is the distance on the optical axis from the intersection of the image side surface of the second lens and the optical axis to the maximum clear aperture of the image side surface of the second lens. More specifically, SAG3, D3, SAG4 and D4 may further satisfy: 1≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤2.5. Satisfying 0.5≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤3 is conducive to smooth transition of peripheral light and to reducing lens sensitivity.

[0093] In an exemplary embodiment, the optical lens according to the present application may satisfy: Vd+ / Nd+≥40, wherein Nd+ is the refractive index of the lens with positive power in the cemented lens, and Vd+ is the Abbe number of the lens with positive power in the cemented lens. More specifically, Vd+ and Nd+ may further satisfy: Vd+ / Nd+≥50. Satisfying Vd+ / Nd+≥40 makes the lens with positive power in the cemented piece preferably made of ultra-low refractive index and ultra-low dispersion materials, which is beneficial for correcting chromatic aberration.

[0094] In an exemplary embodiment, a stop for limiting the light beam may be provided between the third lens and the fourth lens to further improve the imaging quality of the optical lens. Setting the stop between the third lens and the fourth lens is conducive to increasing the stop aperture, effectively converging the light entering the optical lens, and reducing the lens aperture. In an embodiment of the present application, the stop may be provided near the image side surface of the third lens, or near the object side surface of the fourth lens. However, it should be noted that the position of the stop disclosed herein is only an example and not a limitation; in alternative embodiments, the stop may also be provided at other positions according to actual needs.

[0095] In an exemplary embodiment, as needed, the optical lens according to the present application may further include a filter disposed between the seventh lens and the imaging plane to filter light with different wavelengths. The optical lens according to the present application may further include a protective glass disposed between the seventh lens and the imaging plane to prevent the image-side element (e.g., chip) of the optical lens from being damaged.

[0096] As known to those skilled in the art, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in optical lenses can improve image quality and reduce reflection loss of light energy, thereby achieving high resolution and improving the clarity of lens imaging. In addition, the use of cemented lenses can also simplify the assembly process during the lens manufacturing process.

[0097] In an exemplary embodiment, the fifth lens and the sixth lens are glued together to form a glued lens. The fifth lens and the sixth lens have opposite optical powers. For example, if the fifth lens has positive optical power, the sixth lens has negative optical power; or if the fifth lens has negative optical power, the sixth lens has positive optical power. The lens with positive optical power is preferably a lens of low refractive index and low dispersion material, which is beneficial to eliminate chromatic aberration. The fifth lens with a concave image side surface is glued with the sixth lens with a convex object side surface, or the fifth lens with a convex image side surface is glued with the sixth lens with a concave object side surface, which is beneficial to correct various aberrations of the optical system, and realize the improvement of system resolution, optimization of distortion and CRA and other optical performances under the premise of compact optical system structure. The above-mentioned gluing method between lenses has at least one of the following advantages: reducing the self-chromatic aberration, reducing the tolerance sensitivity, and balancing the overall chromatic aberration of the system through the residual partial chromatic aberration; reducing the spacing between the two lenses, thereby reducing the total length of the system; reducing the assembly components between the lenses, thereby reducing the process and reducing costs; reducing the tolerance sensitivity problems such as tilt / eccentricity caused by the lens unit during the assembly process, and improving the production yield; reducing the light loss caused by reflection between lenses, and improving the illumination; further reducing the field curvature, and effectively correcting the off-axis point aberration of the optical lens. Such a gluing design shares the overall chromatic aberration correction of the system, effectively corrects the aberration to improve the resolution, and makes the overall optical system compact to meet the requirements of miniaturization.

[0098] In an exemplary embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may all have an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, the aspherical lens has a better curvature radius characteristic and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. The setting of the aspherical lens helps to correct the system aberration and improve the resolution. Specifically, at least one lens among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical lens, which is beneficial to improving the resolution quality of the optical system.

[0099] According to the optical lens of the above-mentioned embodiment of the present application, by reasonably setting the shape and focal length of each lens, the optical system can achieve at least one beneficial effect of small chromatic aberration, high resolution (up to more than 8 million pixels), miniaturization, small distortion, small front port diameter, small ghost image and good imaging quality when only 7 lenses are used. At the same time, the optical system also takes into account the low-cost requirements of small lens volume, low sensitivity and high production yield. The optical lens also has a long focal length, and the central area has a large angular resolution, which can improve the recognition of environmental objects and specifically increase the detection area of ​​the central part. At the same time, the optical lens has good temperature adaptability, small changes in imaging effects under high and low temperature environments, and stable image quality.

[0100] According to the optical lens of the above-mentioned embodiment of the present application, a cemented lens is provided to share the overall chromatic aberration correction of the system, which is beneficial for correcting the system aberration, improving the system resolution quality, reducing the coordination sensitivity problem, and making the overall structure of the optical system compact to meet the miniaturization requirements.

[0101] In an exemplary embodiment, the first to seventh lenses in the optical lens may all be made of glass. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve system stability. At the same time, the use of glass material can avoid lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the lens. Specifically, when focusing on resolution quality and reliability, the first to seventh lenses may all be glass aspherical lenses. Of course, in applications where temperature stability requirements are lower, the first to seventh lenses in the optical lens may also all be made of plastic. Using plastic to make optical lenses can effectively reduce production costs.

[0102] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiment, the optical lens is not limited to including seven lenses. If necessary, the optical lens may also include other numbers of lenses.

[0103] Specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0104] Example 1

[0105] The following reference Figure 1 An optical lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0106] like Figure 1As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0107] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex and whose image side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative focal power, whose object side surface S10 is concave and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex and whose image side surface S12 is convex. The seventh lens L7 has positive refractive power and is a convex-concave lens near the optical axis, wherein the object-side surface S13 is convex near the optical axis, and the image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0108] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0109] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0110] Table 1 shows the radius of curvature R, thickness d / distance T (it should be understood that the thickness d / distance T of the row where S1 is located is the center thickness d1 of the first lens L1, the thickness d / distance T of the row where S2 is located is the spacing distance T12 between the first lens L1 and the second lens L2, and so on), refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 1.

[0111]

[0112] Table 1

[0113] In Embodiment 1, the object-side surface S5 and the image-side surface S6 of the third lens L3 and the object-side surface S13 and the image-side surface S14 of the seventh lens L7 may be aspherical surfaces, and the surface shape x of each aspherical lens may be defined by, but not limited to, the following aspherical surface formula:

[0114]

[0115] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspheric mirror surface S5, S6, S13 and S14 in Example 1.

[0116] Face number k A4 A6 A8 A10 A12 A14 A16 S5 0.3293 2.5755E-05 6.8127E-06 -1.0898E-06 2.3276E-07 -2.2212E-08 1.0819E-09 -2.1174E-11 S6 -153.1859 5.5603E-04 -2.3146E-05 9.4222E-06 -1.2849E-06 9.2896E-08 -2.7591E-09 5.0835E-12 S13 13.0558 -1.8693E-03 -2.8700E-05 -7.7638E-06 2.0232E-06 -2.5180E-07 1.6134E-08 -4.7997E-10 S14 -103.9655 2.4359E-04 -2.8649E-04 4.6375E-05 -5.5629E-06 4.2192E-07 -1.7670E-08 3.0788E-10

[0117] Table 2

[0118] Example 2

[0119] The following reference Figure 2 An optical lens according to Embodiment 2 of the present application is described. Figure 2 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown.

[0120] like Figure 2 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0121] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex and whose image side surface S9 is convex. The fifth lens L5 is a biconcave lens with negative focal power, whose object side surface S10 is concave and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex and whose image side surface S12 is convex. The seventh lens L7 has positive refractive power and is a convex-concave lens near the optical axis, wherein the object-side surface S13 is convex near the optical axis, and the image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0122] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0123] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0124] Table 3 shows the radius of curvature R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 2. Table 4 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 2, wherein each aspheric surface shape can be defined by formula (1) given in the above-mentioned Example 1.

[0125]

[0126]

[0127] Table 3

[0128] Face number k A4 A6 A8 A10 A12 A14 A16 S5 1.2211 2.8494E-05 7.1240E-06 -1.2034E-06 2.6323E-07 -2.5756E-08 1.2980E-09 -2.5336E-11 S6 -149.0383 5.7112E-04 -2.4717E-05 1.0390E-05 -1.4498E-06 1.0818E-07 -3.2687E-09 7.6056E-12 S13 13.0167 -1.9518E-03 -3.1210E-05 -8.5964E-06 2.2814E-06 -2.9284E-07 1.9330E-08 -5.6580E-10 S14 -101.6136 2.5697E-04 -3.0632E-04 5.1054E-05 -6.2848E-06 4.9056E-07 -2.1060E-08 3.7726E-10

[0129] Table 4

[0130] Example 3

[0131] The following reference Figure 3 An optical lens according to Example 3 of the present application is described. Figure 3 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0132] like Figure 3 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0133] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S10 is convex, and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is convex. The seventh lens L7 has negative power and is a meniscus lens near the optical axis, its object-side surface S13 is concave near the optical axis, and its image-side surface S14 is convex near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0134] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0135] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0136] Table 5 shows the radius of curvature R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 3. Table 6 shows the cone coefficient and high-order coefficient that can be used for each aspherical mirror surface in Example 3, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0137]

[0138] Table 5

[0139] Face number k A4 A6 A8 A10 A12 A14 A16 S5 0.0597 3.0105E-04 1.6696E-05 2.6108E-07 -2.2591E-08 -3.5904E-11 1.9158E-13 3.0833E-13 S6 0.0877 1.0143E-03 2.2200E-05 1.0121E-06 -1.3231E-08 7.4927E-11 3.8505E-13 -8.6678E-13 S13 -3.3721 9.3152E-05 2.8075E-05 -4.6833E-06 4.6753E-07 -4.9041E-08 2.3308E-09 -3.5991E-11 S14 -97.7499 1.8929E-04 9.6972E-05 -1.2301E-05 4.3726E-07 4.5116E-08 -5.4718E-09 1.5840E-10

[0140] Table 6

[0141] Example 4

[0142] The following reference Figure 4 An optical lens according to Example 4 of the present application is described. Figure 4 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0143] like Figure 4 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0144] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S10 is convex, and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is convex. The seventh lens L7 has negative power and is a meniscus lens near the optical axis, its object-side surface S13 is concave near the optical axis, and its image-side surface S14 is convex near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0145] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0146] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0147] Table 7 shows the radius of curvature R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 4. Table 8 shows the cone coefficient and high-order coefficient that can be used for each aspherical mirror surface in Example 4, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0148]

[0149] Table 7

[0150] Face number k A4 A6 A8 A10 A12 A14 A16 S5 0.1634 3.0319E-04 1.6667E-05 2.5357E-07 -2.2751E-08 -3.1290E-11 2.0776E-12 3.9502E-13 S6 0.1627 1.0131E-03 2.2329E-05 1.0328E-06 -1.1342E-08 1.6492E-10 -3.8693E-12 -2.5414E-12 S13 -3.3856 9.3696E-05 2.7574E-05 -4.7256E-06 4.6832E-07 -4.8790E-08 2.3470E-09 -3.5083E-11 S14 -96.3054 1.8717E-04 9.6892E-05 -1.2309E-05 4.3641E-07 4.5115E-08 -5.4634E-09 1.5934E-10

[0151] Table 8

[0152] Example 5

[0153] The following reference Figure 5 An optical lens according to Example 5 of the present application is described. Figure 5 A schematic structural diagram of an optical lens according to Example 5 of the present application is shown.

[0154] like Figure 5 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0155] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S10 is convex, and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is convex. The seventh lens L7 has negative power and is a biconcave lens near the optical axis, its object-side surface S13 is concave near the optical axis, and its image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0156] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0157] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0158] Table 9 shows the radius of curvature R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 5. Table 10 shows the conic coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 5, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0159]

[0160]

[0161] Table 9

[0162] Face number k A4 A6 A8 A10 A12 A14 A16 S5 -0.0301 3.3347E-04 1.8199E-05 -1.2524E-08 -6.6174E-09 5.4844E-10 7.9526E-11 -5.2644E-12 S6 -1.2177 1.1053E-03 2.6998E-05 4.5851E-07 2.7914E-08 6.4324E-10 3.4581E-11 -8.7342E-12 S13 2.3184 -3.0029E-03 7.8319E-05 -2.8484E-06 5.0685E-07 -5.9685E-08 1.0203E-09 6.5354E-11 S14 -99.4410 -2.2247E-03 1.4415E-04 -1.0995E-05 4.2939E-07 4.1401E-08 -5.4879E-09 1.6799E-10

[0163] Table 10

[0164] Example 6

[0165] The following reference Figure 6 An optical lens according to Example 6 of the present application is described. Figure 6 A schematic structural diagram of an optical lens according to Example 6 of the present application is shown.

[0166] like Figure 6 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0167] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a biconvex lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is convex. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative focal power, whose object side surface S10 is convex, and whose image side surface S11 is concave. The sixth lens L6 is a biconvex lens with positive focal power, whose object side surface S11 is convex, and whose image side surface S12 is convex. The seventh lens L7 has negative power and is a biconcave lens near the optical axis, its object-side surface S13 is concave near the optical axis, and its image-side surface S14 is concave near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0168] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the image side surface S6 of the third lens L3.

[0169] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0170] Table 11 shows the curvature radius R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 6. Table 12 shows the curvature radius R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 6.

[0171] The cone coefficient and high-order coefficient of the mirror surface, wherein each aspherical surface shape can be defined by the formula (1) given in the above embodiment 1.

[0172]

[0173]

[0174] Table 11

[0175] Face number k A4 A6 A8 A10 A12 A14 A16 S5 -0.0267 3.3381E-04 1.8240E-05 -1.0066E-08 -6.5198E-09 5.4946E-10 7.9212E-11 -5.3080E-12 S6 -1.2763 1.1057E-03 2.7023E-05 4.6159E-07 2.8185E-08 6.5423E-10 3.3897E-11 -8.9138E-12 S13 2.2144 -3.0023E-03 7.8357E-05 -2.8476E-06 5.0656E-07 -5.9751E-08 1.0149E-09 6.7047E-11 S14 -99.7213 -2.2251E-03 1.4412E-04 -1.0997E-05 4.2932E-07 4.1402E-08 -5.4869E-09 1.6814E-10

[0176] Table 12

[0177] Example 7

[0178] The following reference Figure 7 An optical lens according to Example 7 of the present application is described. Figure 7 A schematic structural diagram of an optical lens according to Example 7 of the present application is shown.

[0179] like Figure 7 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0180] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a convex-concave lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is concave. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconvex lens with positive focal power, whose object side surface S10 is convex, and whose image side surface S11 is convex. The sixth lens L6 is a biconcave lens with negative focal power, whose object side surface S11 is concave, and whose image side surface S12 is concave. The seventh lens L7 has positive refractive power and is a biconvex lens near the optical axis, its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is convex near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0181] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the object-side surface S8 of the fourth lens L4.

[0182] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0183] Table 13 shows the radius of curvature R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 7. Table 14 shows the cone coefficient and high-order coefficient of each aspheric mirror surface that can be used in Example 7, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0184]

[0185] Table 13

[0186] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.7543 7.3103E-06 1.2184E-05 -1.0987E-06 1.4900E-07 -1.0729E-08 4.1815E-10 -6.6247E-12 S4 -0.4831 -1.6155E-06 1.6547E-06 8.0698E-08 -1.0075E-08 5.1438E-10 -1.1829E-11 1.0567E-13 S13 -3.5799 1.4352E-04 2.0776E-05 -8.6370E-07 4.1368E-07 -4.4832E-08 2.1298E-09 -3.4732E-11 S14 -201.6206 -1.2332E-03 1.9847E-04 -1.5638E-05 6.2622E-07 4.1842E-08 -4.9371E-09 1.4125E-10

[0187] Table 14

[0188] Example 8

[0189] The following reference Figure 8 An optical lens according to Example 8 of the present application is described. Figure 8 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown.

[0190] like Figure 8 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis.

[0191] The first lens L1 is a convex-concave lens with negative focal power, whose object side surface S1 is convex, and whose image side surface S2 is concave. The second lens L2 is a convex-concave lens with negative focal power, whose object side surface S3 is concave, and whose image side surface S4 is convex. The third lens L3 is a convex-concave lens with positive focal power, whose object side surface S5 is convex, and whose image side surface S6 is concave. The fourth lens L4 is a biconvex lens with positive focal power, whose object side surface S8 is convex, and whose image side surface S9 is convex. The fifth lens L5 is a biconvex lens with positive focal power, whose object side surface S10 is convex, and whose image side surface S11 is convex. The sixth lens L6 is a biconcave lens with negative focal power, whose object side surface S11 is concave, and whose image side surface S12 is concave. The seventh lens L7 has positive refractive power and is a biconvex lens near the optical axis, its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is convex near the optical axis. The fifth lens L5 and the sixth lens L6 can be cemented to form a cemented lens.

[0192] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed close to the object-side surface S8 of the fourth lens L4.

[0193] Optionally, the optical lens may further include a filter L8 having an object side surface S15 and an image side surface S16, and the filter L8 may be used to correct color deviation. The optical lens may further include a protective glass L9 having an object side surface S17 and an image side surface S18, and the protective glass L9 may be used to protect the image sensor chip IMA located at the imaging surface S19. The light from the object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0194] Table 15 shows the radius of curvature R, thickness d / distance T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 8. Table 16 shows the cone coefficient and high-order coefficient that can be used for each aspheric mirror surface in Example 8, wherein each aspheric surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0195]

[0196] Table 15

[0197]

[0198]

[0199] Table 16

[0200] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17-1 and Table 17-2 below. In Table 17-1 and Table 17-2, the units of TTL, F, H, D, F-, F+, F7, F1, F2, F3, F4, T67, R3, R4, d3, D3, D4, SAG3, and SAG4 are millimeters (mm), and the unit of FOV is degrees (°).

[0201] Conditional formula\Example Example 1 Example 2 Example 3 Example 4 TTL 30.2622 29.6921 29.2070 29.174 F 4.0000 4.0917 4.1496 4.1468 H 9.3000 9.1320 10.0660 10.0520 FOV 140 140 140 140 D 13.6959 13.7173 13.4106 13.4248 F- -4.7301 -4.6627 -6.6239 -6.6231 F+ 7.0522 6.9561 6.6588 6.6579 F7 59.0309 60.2297 -26.2769 -26.1821 SAG3 / D3 -0.2914 -0.3006 -0.3408 -0.3424 SAG4 / D4 -0.2169 -0.2126 -0.1787 -0.1786 F1 -7.1279 -7.0366 -7.4568 -7.4566 F2 -79.1759 -80.9175 -19.8473 -20.2327 F3 12.7109 12.5174 13.3259 13.3278 F4 9.9132 9.7727 8.8233 8.8241 TTL / F 7.5656 7.2566 7.0384 7.0352 TTL / H / FOV 0.0232 0.0232 0.0207 0.0207 D / H / FOV 0.0105 0.0107 0.0095 0.0095 |F+ / F-| 1.4909 1.4919 1.0053 1.0053 |F7 / F| 14.7577 14.7199 6.3323 6.3137 T67 / TTL 0.0342 0.0345 0.0103 0.0103 |R3-R4-d3|(mm) 1.9731 2.0107 2.1740 2.1755 d3 / TTL 0.1870 0.1879 0.1273 0.1274 (FOV×F) / H 60.2151 62.7291 57.7140 57.7554 arctan(SAG3 / D3) / arctan(SAG4 / D4) 1.3277 1.3940 1.8570 1.8664 Vd+ / Nd+ 54.6150 54.6150 54.5146 54.5146

[0202] Table 17-1

[0203]

[0204]

[0205] Table 17-2

[0206] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be an independent electronic device such as a detection distance camera, or an imaging module integrated in a device such as a detection distance device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated in a driving assistance system such as a vehicle-mounted camera.

[0207] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave; The second lens has a negative optical power, and its object side surface is concave and its image side surface is convex; The third lens has positive power and its object side surface is convex; a fourth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; a fifth lens having optical power; a sixth lens having optical power; and a seventh lens having optical power; Wherein, the number of lenses with optical power in the optical lens is seven; One of the fifth lens and the sixth lens has positive power, the other of the fifth lens and the sixth lens has negative power, and the fifth lens and the sixth lens are cemented to form a cemented lens; The half-aperture D3 of the maximum clear aperture of the object side surface of the second lens corresponding to the maximum field angle of the optical lens, the distance SAG3 from the intersection of the object side surface of the second lens and the optical axis to the maximum clear aperture of the object side surface of the second lens on the optical axis, the half-aperture D4 of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field angle of the optical lens, and the distance SAG4 from the intersection of the image side surface of the second lens and the optical axis to the maximum clear aperture of the image side surface of the second lens on the optical axis satisfy the following: 1≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤3; The distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens satisfy the following conditions: 7.0352≤TTL / F≤9; The maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy the following conditions: (FOV×F) / H≤62.7291°; The maximum field of view FOV of the optical lens, the maximum light clearance D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: D / H / FOV×180°≤4.

5.

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

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

4. The optical lens according to claim 1, characterized in that: The fifth lens has negative optical power, and its object side surface is concave and its image side surface is concave.

5. The optical lens according to claim 1, characterized in that: The fifth lens has negative optical power, an object-side surface is convex, and an image-side surface is concave.

6. The optical lens according to claim 1, characterized in that: The fifth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex.

7. The optical lens according to claim 1, characterized in that: The sixth lens has positive refractive power, and its object-side surface is convex and its image-side surface is convex.

8. The optical lens according to claim 1, characterized in that: The sixth lens has negative optical power, and its object side surface is concave and its image side surface is concave.

9. The optical lens according to claim 1, characterized in that: The seventh lens has positive refractive power, an object-side surface thereof is convex in a region close to the optical axis, and an image-side surface thereof is concave in a region close to the optical axis.

10. The optical lens according to claim 1, characterized in that: The seventh lens has negative refractive power, and its object side surface is concave in a region close to the optical axis, and its image side surface is convex in a region close to the optical axis.

11. The optical lens according to claim 1, characterized in that: The seventh lens has negative refractive power, and its object side surface is concave in a region close to the optical axis, and its image side surface is concave in a region close to the optical axis.

12. The optical lens according to claim 1, characterized in that: The seventh lens has positive refractive power, and its object side surface is convex in a region close to the optical axis, and its image side surface is convex in a region close to the optical axis.

13. The optical lens according to claim 1, characterized in that: There is at least one inflection point on the object-side surface of the seventh lens and the image-side surface of the seventh lens.

14. The optical lens according to claim 1, characterized in that: At least two lenses among the second lens, the third lens, the fourth lens and the seventh lens have aspherical mirror surfaces.

15. The optical lens according to any one of claims 1 to 14, characterized in that: The distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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: TTL / H / FOV×180°≤18.

16. The optical lens according to any one of claims 1 to 14, characterized in that: The maximum field of view FOV of the optical lens, the maximum light clearance D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: D / H / FOV×180°≤1.

926.

17. The optical lens according to any one of claims 1 to 14, characterized in that: The effective focal length F+ of the lens with positive power in the cemented lens and the effective focal length F- of the lens with negative power in the cemented lens satisfy: 0.5≤|F+ / F-|≤3.

18. The optical lens according to any one of claims 1 to 14, characterized in that: The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: |F7 / F|≥1.

5.

19. The optical lens according to any one of claims 2 to 14, characterized in that: A distance T67 between the sixth lens and the seventh lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0≤T67 / TTL≤0.

2.

20. The optical lens according to any one of claims 1 to 14, characterized in that: A curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens on the optical axis satisfy: |R3-R4-d3|≥1.5 mm.

21. The optical lens according to any one of claims 1 to 14, characterized in that: The center thickness d3 of the second lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.05≤d3 / TTL≤0.

3.

22. The optical lens according to any one of claims 1 to 14, characterized in that: The refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens satisfy: Vd+ / Nd+≥40.

23. The optical lens according to claim 17, characterized in that: The effective focal length F+ of the lens with positive power in the cemented lens and the effective focal length F- of the lens with negative power in the cemented lens satisfy: 1.0053≤|F+ / F-|≤3.

24. The optical lens according to claim 18, characterized in that: The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: |F7 / F|≥5.2403.

25. The optical lens according to claim 18, characterized in that: The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 5.2403≤|F7 / F|≤14.7577.

26. The optical lens according to claim 20, characterized in that: A curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens on the optical axis satisfy: |R3-R4-d3|≥1.9731 mm.

27. The optical lens according to claim 22, characterized in that: The refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens satisfy: Vd+ / Nd+≥50.

28. An optical lens, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave; The second lens has a negative optical power, and its object side surface is concave and its image side surface is convex; The third lens has positive power and its object side surface is convex; a fourth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; a fifth lens having optical power; a sixth lens having optical power; and a seventh lens having optical power; Wherein, the number of lenses with optical power in the optical lens is seven; The distance T67 between the sixth lens and the seventh lens on the optical axis and the distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following conditions: 0≤T67 / TTL≤0.2; The half-aperture D3 of the maximum clear aperture of the object side surface of the second lens corresponding to the maximum field angle of the optical lens, the distance SAG3 from the intersection of the object side surface of the second lens and the optical axis to the maximum clear aperture of the object side surface of the second lens on the optical axis, the half-aperture D4 of the maximum clear aperture of the image side surface of the second lens corresponding to the maximum field angle of the optical lens, and the distance SAG4 from the intersection of the image side surface of the second lens and the optical axis to the maximum clear aperture of the image side surface of the second lens on the optical axis satisfy the following: 1≤arctan(SAG3 / D3) / arctan(SAG4 / D4)≤3; The distance TTL from the object side of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens satisfy the following conditions: 7.0352≤TTL / F≤9; The maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy the following conditions: (FOV×F) / H≤62.7291°; The maximum field of view FOV of the optical lens, the maximum light clearance D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: D / H / FOV×180°≤4.

5.

29. The optical lens according to claim 28, characterized in that: One of the fifth lens and the sixth lens has positive power, the other of the fifth lens and the sixth lens has negative power, and the fifth lens and the sixth lens are cemented to form a cemented lens.

30. The optical lens according to claim 28, characterized in that: The image side surface of the third lens is a convex surface.

31. The optical lens according to claim 28, characterized in that: The image side surface of the third lens is a concave surface.

32. The optical lens according to claim 28, characterized in that: The fifth lens has negative optical power, and its object side surface is concave and its image side surface is concave.

33. The optical lens according to claim 28, characterized in that: The fifth lens has negative optical power, an object-side surface is convex, and an image-side surface is concave.

34. The optical lens according to claim 28, characterized in that: The fifth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex.

35. The optical lens according to claim 28, characterized in that: The sixth lens has positive refractive power, and its object-side surface is convex and its image-side surface is convex.

36. The optical lens according to claim 28, characterized in that: The sixth lens has negative optical power, and its object side surface is concave and its image side surface is concave.

37. The optical lens according to claim 28, characterized in that: The seventh lens has positive refractive power, an object-side surface thereof is convex in a region close to the optical axis, and an image-side surface thereof is concave in a region close to the optical axis.

38. The optical lens according to claim 28, characterized in that: The seventh lens has negative refractive power, and its object side surface is concave in a region close to the optical axis, and its image side surface is convex in a region close to the optical axis.

39. The optical lens according to claim 28, characterized in that: The seventh lens has negative refractive power, and its object side surface is concave in a region close to the optical axis, and its image side surface is concave in a region close to the optical axis.

40. The optical lens according to claim 28, characterized in that: The seventh lens has positive refractive power, and its object side surface is convex in a region close to the optical axis, and its image side surface is convex in a region close to the optical axis.

41. The optical lens according to claim 28, characterized in that: There is at least one inflection point on the object-side surface of the seventh lens and the image-side surface of the seventh lens.

42. The optical lens according to claim 28, characterized in that: At least two lenses among the second lens, the third lens, the fourth lens and the seventh lens have aspherical mirror surfaces.

43. The optical lens according to any one of claims 28 to 42, characterized in that: The distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: TTL / H / FOV×180°≤18.

44. The optical lens according to any one of claims 28 to 42, characterized in that: The maximum field of view FOV of the optical lens, the maximum light clearance D of the object side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: D / H / FOV×180°≤1.

926.

45. The optical lens according to claim 29, characterized in that: The effective focal length F+ of the lens with positive power in the cemented lens and the effective focal length F- of the lens with negative power in the cemented lens satisfy: 0.5≤|F+ / F-|≤3.

46. ​​The optical lens according to any one of claims 28 to 42, characterized in that: The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: |F7 / F|≥1.

5.

47. The optical lens according to any one of claims 28 to 42, characterized in that: A curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens on the optical axis satisfy: |R3-R4-d3|≥1.5 mm.

48. The optical lens according to any one of claims 28 to 42, characterized in that: The center thickness d3 of the second lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.05≤d3 / TTL≤0.

3.

49. The optical lens according to claim 29, characterized in that: The refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens satisfy: Vd+ / Nd+≥40.

50. The optical lens according to claim 45, characterized in that: The effective focal length F+ of the lens with positive power in the cemented lens and the effective focal length F- of the lens with negative power in the cemented lens satisfy: 1.0053≤|F+ / F-|≤3.

51. The optical lens according to claim 46, characterized in that: The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: |F7 / F|≥5.2403.

52. The optical lens according to claim 46, characterized in that: The effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy: 5.2403≤|F7 / F|≤14.7577.

53. The optical lens according to claim 47, characterized in that: A curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and a center thickness d3 of the second lens on the optical axis satisfy: |R3-R4-d3|≥1.9731 mm.

54. The optical lens according to claim 49, characterized in that: The refractive index Nd+ of the lens with positive power in the cemented lens and the Abbe number Vd+ of the lens with positive power in the cemented lens satisfy: Vd+ / Nd+≥50.

55. An electronic device, characterized in that: It comprises an optical lens according to any one of claims 1 to 54 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images