Optical lens and electronic equipment

Abstract

The invention provides an optical lens and electronic equipment. The optical lens sequentially comprises, from a first side to a second side, a first lens with negative focal power, a second lens with negative focal power and a third lens with negative focal power, the second lens has positive focal power, and the first side surface of the second lens is a convex surface; the first side surface of the third lens is a concave surface, and the second side surface of the third lens is a convex surface; the fourth lens has negative focal power, and the second side surface of the fourth lens is a concave surface; the fifth lens has positive focal power, and the first side surface of the fifth lens is a convex surface; the first side face of the sixth lens is a concave face, and the second side face of the sixth lens is a convex face. According to the invention, the problem that high relative illumination, long back focal length, high resolution and low cost of an optical lens in the prior art are difficult to consider at the same time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical lens and an electronic device. Background Art

[0002] In recent years, with the development of science and technology, the demand for optical lenses in daily life has increased, and optical lenses have been applied to more and more scenarios. For example, in the automobile driving industry, in order to ensure driving safety, it is necessary to detect the driving environment more accurately, and optical lenses have become a key device for detecting information around the car.

[0003] With the rapid development of the automobile automatic driving assistance system, the number of optical lenses used in automobiles has gradually increased. Among them, side view is also an important application direction of vehicle-mounted lenses, which are mainly divided into two categories: side front view and side rear view. They are installed on the B-pillar or the vehicle rearview mirror. The field of view angle range is usually 90°-100°. They are mainly used in electronic rearview mirrors, side vehicle detection, vehicle lane change and other scenes. In recent years, with the update and iteration of vehicle-mounted lenses, while pursuing to ensure safe driving, compared with ordinary optical lenses, vehicle-mounted lenses have more stringent standards and requirements. For example: the existing ones usually require high relative illumination to avoid the risk of traffic accidents caused by dark corners such as low illumination of the edge field of view; long back focus is also required to ensure the adaptability of the mechanism, and can effectively reduce the large halo ghost images produced by strong light sources, which can avoid the influence of bright light sources such as car lights on the recognition results; high resolution is also required. With the emergence of million-level chips, optical lenses also need to improve clarity to adapt; they also need to meet low costs to take into account low-end models. However, the current optical lenses are not enough to meet these requirements.

[0004] That is to say, the optical lens in the prior art has the problem that it is difficult to take into account high relative illumination, back focal length, high resolution and low cost at the same time. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical lens and an electronic device to solve the problem that the optical lens in the prior art has high relative illumination, back focal length, high resolution and low cost that are difficult to take into account at the same time.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, an optical lens is provided, which comprises, from the first side to the second side: a first lens having negative optical power, wherein the second side surface of the first lens is a concave surface; a second lens having positive optical power, wherein the first side surface of the second lens is a convex surface; a third lens having optical power, wherein the first side surface of the third lens is a concave surface, and the second side surface is a convex surface; a fourth lens having negative optical power, wherein the second side surface of the fourth lens is a concave surface; a fifth lens having positive optical power, wherein the first side surface of the fifth lens is a convex surface; and a sixth lens having optical power, wherein the first side surface of the sixth lens is a concave surface, and the second side surface is a convex surface.

[0007] Furthermore, the first side surface of the first lens is a concave surface.

[0008] Furthermore, the first side surface of the first lens is a convex surface.

[0009] Furthermore, the second side surface of the second lens is a convex surface.

[0010] Furthermore, the second side surface of the second lens is a concave surface.

[0011] Furthermore, the third lens has positive refractive power.

[0012] Furthermore, the third lens has negative power.

[0013] Furthermore, the first side surface of the fourth lens is a convex surface.

[0014] Furthermore, the first side surface of the fourth lens is a concave surface.

[0015] Furthermore, the second side surface of the fifth lens is a concave surface.

[0016] Furthermore, the second side surface of the fifth lens is a convex surface.

[0017] Furthermore, the sixth lens has positive refractive power.

[0018] Furthermore, the sixth lens has negative power.

[0019] Furthermore, the fourth lens and the fifth lens are cemented together to form a doublet lens.

[0020] Furthermore, the sixth lens is configured to be retroflex.

[0021] Furthermore, the third lens and the sixth lens are both aspherical lenses.

[0022] Furthermore, the optical lens also includes a stop, and the stop is arranged between the second lens and the third lens.

[0023] Furthermore, a curvature radius R62 of the second side surface of the sixth lens element satisfies the relationship between the entire focal length F of the optical lens set: R62 / F≤-0.1.

[0024] Furthermore, the maximum field of view FOV of the optical lens, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥40.

[0025] Furthermore, the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface of the optical lens and the entire focal length value F of the optical lens satisfy: TTL / F≤7.

[0026] Furthermore, the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface 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 satisfy: TTL / H / FOV≤0.2.

[0027] Furthermore, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens and the maximum light clearance D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy: TTL / D≤5.

[0028] Furthermore, the entire focal length value F of the optical lens, the arc value θ of the maximum field angle of the optical lens and the maximum light clearance diameter D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: (F*θ) / D≥0.1.

[0029] Furthermore, the maximum light clearance aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D / H / FOV≤0.15.

[0030] Furthermore, the maximum light clearance D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the entire focal length value F of the optical lens satisfy: D / H / F≤1.5.

[0031] Furthermore, the image height H corresponding to the maximum field angle of the optical lens, the entire focal length value F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.15.

[0032] Furthermore, the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfy the following conditions: BFL / TTL≥0.2.

[0033] Furthermore, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.1≤F / H≤3.

[0034] Furthermore, the air interval d2 between the first lens and the second lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface of the optical lens, satisfy: d2 / TTL≥0.1.

[0035] Furthermore, the entire focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤2.5.

[0036] Furthermore, the entire focal length value F of the optical lens, the entrance pupil diameter ENPD of the optical lens and the maximum clear aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: F / ENPD / D≤1.2.

[0037] Furthermore, the aperture diameter DST of the optical lens and the entire focal length value F of the optical lens satisfy: DST / F≥0.08.

[0038] Further, a curvature radius R61 of the first side surface of the sixth lens and a curvature radius R62 of the second side surface of the sixth lens satisfy: 0.1≤R61 / R62≤3.

[0039] Furthermore, the image height H corresponding to the maximum field angle of the optical lens, the entire focal length value F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: 0.1≤(H / 2) / (F*tan(θ / 2))≤2.

[0040] Furthermore, the focal length of the optical lens Combined power of the second and third lenses Satisfy between:

[0041] Further, a sag height SAG31 of the first side surface of the third lens and a sag height SAG32 of the second side surface of the third lens satisfy: 0.01≤|SAG31 / SAG32|≤3.

[0042] Further, the sag height SAG61 of the first side surface of the sixth lens and the sag height SAG62 of the second side surface of the sixth lens satisfy: 0.01≤|SAG61 / SAG62|≤5.

[0043] Further, a curvature radius R61 of the first side surface of the sixth lens, a curvature radius R62 of the second side surface of the sixth lens, and a center thickness d10 of the sixth lens satisfy: 0.1≤R61 / (R62+d10)≤3.5.

[0044] According to another aspect of the present invention, an optical lens is provided, comprising, from a first side to a second side, in sequence: a first lens having negative optical power; a second lens having positive optical power; a third lens having optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; and a sixth lens having optical power; wherein a radius of curvature R62 of a second side surface of the sixth lens satisfies the following relation with the focal length value F of the entire group of the optical lens: R62 / F≤-0.1.

[0045] Furthermore, the first side surface of the first lens is a concave surface, and the second side surface is a concave surface.

[0046] Furthermore, the first side surface of the first lens is a convex surface, and the second side surface is a concave surface.

[0047] Furthermore, the first side surface of the second lens is a convex surface, and the second side surface is a convex surface.

[0048] Furthermore, the first side surface of the second lens is a convex surface, and the second side surface is a concave surface.

[0049] Furthermore, the third lens has positive optical power, a first side surface of the third lens is a concave surface, and a second side surface of the third lens is a convex surface.

[0050] Furthermore, the third lens has negative optical power, the first side surface of the third lens is a concave surface, and the second side surface is a convex surface.

[0051] Furthermore, the first side surface of the fourth lens is a convex surface, and the second side surface is a concave surface.

[0052] Furthermore, the first side surface of the fourth lens is a concave surface, and the second side surface is a concave surface.

[0053] Furthermore, the first side surface of the fifth lens is a convex surface, and the second side surface is a concave surface.

[0054] Furthermore, the first side surface of the fifth lens is a convex surface, and the second side surface is a convex surface.

[0055] Furthermore, the sixth lens has positive power, a first side surface of the sixth lens is a concave surface, and a second side surface of the sixth lens is a convex surface.

[0056] Furthermore, the sixth lens has negative optical power, the first side surface of the sixth lens is concave, and the second side surface is convex.

[0057] Furthermore, the fourth lens and the fifth lens are cemented together to form a doublet lens.

[0058] Furthermore, the sixth lens is configured to be retroflex.

[0059] Furthermore, the third lens and the sixth lens are both aspherical lenses.

[0060] Furthermore, the optical lens also includes a stop, and the stop is arranged between the second lens and the third lens.

[0061] Furthermore, the maximum field of view FOV of the optical lens, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥40.

[0062] Furthermore, the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface of the optical lens and the entire focal length value F of the optical lens satisfy: TTL / F≤7.

[0063] Furthermore, the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface 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 satisfy: TTL / H / FOV≤0.2.

[0064] Furthermore, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens and the maximum light clearance D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy: TTL / D≤5.

[0065] Furthermore, the entire focal length value F of the optical lens, the arc value θ of the maximum field angle of the optical lens and the maximum light clearance diameter D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: (F*θ) / D≥0.1.

[0066] Furthermore, the maximum light clearance aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D / H / FOV≤0.15.

[0067] Furthermore, the maximum light clearance D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the entire focal length value F of the optical lens satisfy: D / H / F≤1.5.

[0068] Furthermore, the image height H corresponding to the maximum field angle of the optical lens, the entire focal length value F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.15.

[0069] Furthermore, the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging plane of the optical lens, satisfy the following conditions: BFL / TTL≥0.2.

[0070] Furthermore, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.1≤F / H≤3.

[0071] Furthermore, the air interval d2 between the first lens and the second lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface of the optical lens, satisfy: d2 / TTL≥0.1.

[0072] Furthermore, the entire focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤2.5.

[0073] Furthermore, the entire focal length value F of the optical lens, the entrance pupil diameter ENPD of the optical lens and the maximum clear aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: F / ENPD / D≤1.2.

[0074] Furthermore, the aperture diameter DST of the optical lens and the entire focal length value F of the optical lens satisfy: DST / F≥0.08.

[0075] Further, a curvature radius R61 of the first side surface of the sixth lens and a curvature radius R62 of the second side surface of the sixth lens satisfy: 0.1≤R61 / R62≤3.

[0076] Furthermore, the image height H corresponding to the maximum field angle of the optical lens, the entire focal length value F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: 0.1≤(H / 2) / (F*tan(θ / 2))≤2.

[0077] Furthermore, the focal length of the optical lens Combined power of the second and third lenses Satisfy between:

[0078] Further, a sag height SAG31 of the first side surface of the third lens and a sag height SAG32 of the second side surface of the third lens satisfy: 0.01≤|SAG31 / SAG32|≤3.

[0079] Further, the sag height SAG61 of the first side surface of the sixth lens and the sag height SAG62 of the second side surface of the sixth lens satisfy: 0.01≤|SAG61 / SAG62|≤5.

[0080] Further, a curvature radius R61 of the first side surface of the sixth lens, a curvature radius R62 of the second side surface of the sixth lens, and a center thickness d10 of the sixth lens satisfy: 0.1≤R61 / (R62+d10)≤3.5.

[0081] According to another aspect of the present invention, an electronic device is provided, comprising the above-mentioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0082] According to the technical solution of the present invention, the optical lens comprises, from the first side to the second side, a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power, a fifth lens with positive optical power and a sixth lens with optical power, wherein the second side surface of the first lens is concave; the first side surface of the second lens is convex; the first side surface of the third lens is concave, and the second side surface is convex; the second side surface of the fourth lens is concave; the first side surface of the fifth lens is convex; the first side surface of the sixth lens is concave, and the second side surface is convex.

[0083] The first lens has negative focal length, and the first side of the first lens can be concave or convex, and the second side is concave. The first lens has negative focal length and has a divergent effect on the light passing through it. Under the same field of view angle, the light emitted through the second side of the first lens can make the subsequent optical system have a larger light receiving surface; when the first side of the first lens is concave, it can avoid contact and friction between the lens and the surrounding, which is beneficial to the protection of the lens and the film layer; the second side is concave, which can quickly diverge the large-angle light passing through the first side of the first lens, which is beneficial to the correction of the aberration of large-angle light by the rear optical system and achieve high resolution. When the first side of the first lens is convex, it can collect as much large-field light as possible to enter the rear optical system, and in actual use environments such as rainy and snowy weather, it is beneficial to the sliding of water droplets and reduces the impact on imaging.

[0084] The second lens has positive focal power, and the first side surface of the second lens is convex, and the second side surface can be convex or concave. Glass with positive focal power, high refractive index and low Abbe number can smoothly receive the light diverged by the first lens, and complement the chromatic aberration with the glass with low refractive index and high Abbe number of the first lens. When the second side surface of the second lens is convex, the shape is biconvex, and the lens shape is flat, so that the divergent light can smoothly enter the rear, which is easy to lengthen the distance between the first lens and the second lens, and reduce the aperture and sensitivity of the rear group of the system. When the second side surface of the second lens is concave, the lens shape is flat, so that the divergent light can smoothly enter the rear after converging, further making the light trend smoothly transition, which can reduce the loss of light energy and is beneficial to the illumination of the peripheral field of view.

[0085] The third lens can be of positive or negative focal power, and the first side surface of the third lens is concave, and the second side surface is convex. When the third lens has positive focal power, the third lens is preferably an aspherical lens in the shape of a crescent, which has a convergence effect on light, which is conducive to reducing the total length of the system, increasing the aperture of the optical lens, and increasing the amount of light entering. When the third lens has negative focal power, the third lens is preferably an aspherical lens in the shape of a crescent, which can receive and diverge the front light, so that the edge field of view light beam reaches the third lens with a higher height and a wider width, thereby improving the relative illumination of the edge field of view.

[0086] The fourth lens has negative optical power, and the first side surface of the fourth lens can be convex or concave, and the second side surface is concave. When the first side surface of the fourth lens is convex, the edge field light is deflected downward (toward the center) after passing through the first side surface of the fourth lens, reducing the rear-end system aperture. When the first side surface of the fourth lens is concave, the shape of the fourth lens is biconcave, and the light tends to diverge before and after passing through the fourth lens. The edge light and the center light of each field of view are clearly distinguished, which is conducive to the aberration correction of the center and edge light of each field of view, and is conducive to achieving high resolution.

[0087] The fifth lens has positive focal power, and the first side surface of the fifth lens is convex, and the second side surface can be concave or convex. When the second side surface of the fifth lens is concave, the fifth lens is convex-concave, has positive focal power, and is a meniscus shape convex to the first side. It collects the light entering through the fourth lens, so that the light trend transitions smoothly to the rear, reduces the height of the light incident to the rear, and thus reduces the sensitivity of the rear group of the system. When the second side surface of the fifth lens is convex, the fifth lens is biconvex, so that the divergent light converges and smoothly enters the rear, further making the light trend transition smoothly; the second side surface of the fifth lens is convex, so that the light is further converged, realizing the reduction of the angle between the edge principal light and the normal of the imaging surface, thereby realizing the improvement of the relative illumination of the edge field of view.

[0088] The sixth lens may have positive focal power or negative focal power, and the first side surface of the sixth lens is concave and the second side surface is convex. When the sixth lens has positive focal power, the sixth lens is preferably an aspherical lens, and the light trend is stable, which can improve the astigmatism and field curvature of the imaging, improve the resolution of the optical system, and reduce the cone angle and the incident angle of the main light when the edge field of view light beam reaches the imaging surface; the shape of the sixth lens is concave and convex, and the lens shape is gentle. The large temperature change has little effect on the focal length of the sixth lens, which is conducive to the whole optical system to maintain stable performance within a large temperature change range; the second side surface is convex, which is conducive to increasing the cone angle when the light reaches the imaging surface and reducing the incident angle of the main light, converging light with a larger aperture, and increasing the amount of light entering the optical lens. When the sixth lens has negative focal power, the sixth lens is preferably an aspherical lens, which is conducive to adjusting the aberration of the large field of view angle at the edge, and can improve the large-angle resolution of the central area.

[0089] The present application adopts six lenses, and by optimizing the optical focal length and surface shape of each lens, the optical lens of the present invention has at least one beneficial effect of high relative illumination, long back focal length, high resolution, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0091] Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present invention is shown;

[0092] Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present invention is shown;

[0093] Figure 3 A schematic diagram showing the structure of an optical lens according to Example 3 of the present invention is shown;

[0094] Figure 4 A schematic diagram showing the structure of an optical lens according to Example 4 of the present invention is shown;

[0095] Figure 5 A schematic diagram showing the structure of an optical lens according to Example 5 of the present invention is shown;

[0096] Figure 6 A schematic diagram showing the structure of an optical lens according to Example 6 of the present invention is shown;

[0097] Figure 7 A schematic diagram showing the structure of an optical lens according to Example 7 of the present invention is shown;

[0098] Figure 8 A schematic diagram of the structure of the optical lens of Example 8 of the present invention is shown.

[0099] The above drawings include the following reference numerals:

[0100] L1, first lens; S1, first side surface of the first lens; S2, second side surface of the first lens; L2, second lens; S3, first side surface of the second lens; S4, second side surface of the second lens; STO, aperture; L3, third lens; S6, first side surface of the third lens; S7, second side surface of the third lens; L4, fourth lens; S8, first side surface of the fourth lens; S9, second side surface of the fourth lens; L5, fifth lens; S9, first side surface of the fifth lens; S10, second side surface of the fifth lens; L6, sixth lens; S11, first side surface of the sixth lens; S12, second side surface of the sixth lens; S13, first side surface of the protective glass; S14, second side surface of the protective glass; IMA, imaging surface. DETAILED DESCRIPTION

[0101] 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 invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0102] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0103] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0104] 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.

[0105] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0106] 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 close to the first side is called the first side of the lens, and the surface of each lens close to the second side is called the second side of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of the general knowledgeable person in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the first side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the second side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0107] It should be noted that the left side of the optical lens is the first side, and the right side of the optical lens is the second side.

[0108] In an exemplary embodiment, the optical lens provided by the present application can be used as a vehicle-mounted lens. For the vehicle-mounted lens, the left side is the object side and the right side is the image side; the first side is the object side and the second side is the image side. Light from the object side can be imaged on the image side.

[0109] When the optical lens of the present application is applied to a projection lens or a radar transmitting lens, the left side is the imaging side and the right side is the image source side. In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the image side of the optical lens can be the image source side, and the object side can be the imaging side. Light from the image source side can be imaged on the imaging side, and the imaging surface of the optical lens is the image source surface.

[0110] In order to solve the problem that it is difficult to simultaneously take into account high relative illumination, back focal length, high resolution and low cost in the optical lens in the prior art, the present invention provides an optical lens and an electronic device.

[0111] Embodiment 1

[0112] like Figures 1 to 8 As shown, the optical lens includes, from the first side to the second side, a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power, a fifth lens with positive optical power and a sixth lens with optical power, the second side surface of the first lens is concave; the first side surface of the second lens is convex; the first side surface of the third lens is concave, and the second side surface is convex; the second side surface of the fourth lens is concave; the first side surface of the fifth lens is convex; the first side surface of the sixth lens is concave, and the second side surface is convex.

[0113] The first lens has negative focal length, and the first side of the first lens can be concave or convex, and the second side is concave. The first lens has negative focal length and has a divergent effect on the light passing through it. Under the same field of view angle, the light emitted through the second side of the first lens can make the subsequent optical system have a larger light receiving surface; when the first side of the first lens is concave, it can avoid contact and friction between the lens and the surrounding, which is beneficial to the protection of the lens and the film layer; the second side is concave, which can quickly diverge the large-angle light passing through the first side of the first lens, which is beneficial to the correction of the aberration of large-angle light by the rear optical system and achieve high resolution. When the first side of the first lens is convex, it can collect as much large-field light as possible to enter the rear optical system, and in actual use environments such as rainy and snowy weather, it is beneficial to the sliding of water droplets and reduces the impact on imaging.

[0114] The second lens has positive focal power, and the first side surface of the second lens is convex, and the second side surface can be convex or concave. Glass with positive focal power, high refractive index and low Abbe number can smoothly receive the light diverged by the first lens, and complement the chromatic aberration with the glass with low refractive index and high Abbe number of the first lens. When the second side surface of the second lens is convex, the shape is biconvex, and the lens shape is flat, so that the divergent light can smoothly enter the rear, which is easy to lengthen the distance between the first lens and the second lens, and reduce the aperture and sensitivity of the rear group of the system. When the second side surface of the second lens is concave, the lens shape is flat, so that the divergent light can smoothly enter the rear after converging, further making the light trend smoothly transition, which can reduce the loss of light energy and is beneficial to the illumination of the peripheral field of view.

[0115] The third lens can be of positive or negative focal power, and the first side surface of the third lens is concave, and the second side surface is convex. When the third lens has positive focal power, the third lens is preferably an aspherical lens in the shape of a crescent, which has a convergence effect on light, which is conducive to reducing the total length of the system, increasing the aperture of the optical lens, and increasing the amount of light entering. When the third lens has negative focal power, the third lens is preferably an aspherical lens in the shape of a crescent, which can receive and diverge the front light, so that the edge field of view light beam reaches the third lens with a higher height and a wider width, thereby improving the relative illumination of the edge field of view.

[0116] The fourth lens has negative optical power, and the first side surface of the fourth lens can be convex or concave, and the second side surface is concave. When the first side surface of the fourth lens is convex, the edge field light is deflected downward (toward the center) after passing through the first side surface of the fourth lens, reducing the rear-end system aperture. When the first side surface of the fourth lens is concave, the shape of the fourth lens is biconcave, and the light tends to diverge before and after passing through the fourth lens. The edge light and the center light of each field of view are clearly distinguished, which is conducive to the aberration correction of the center and edge light of each field of view, and is conducive to achieving high resolution.

[0117] The fifth lens has positive focal power, and the first side surface of the fifth lens is convex, and the second side surface can be concave or convex. When the second side surface of the fifth lens is concave, the fifth lens is convex-concave, has positive focal power, and is a meniscus shape convex to the first side. It collects the light entering through the fourth lens, so that the light trend transitions smoothly to the rear, reduces the height of the light incident to the rear, and thus reduces the sensitivity of the rear group of the system. When the second side surface of the fifth lens is convex, the fifth lens is biconvex, so that the divergent light converges and smoothly enters the rear, further making the light trend transition smoothly; the second side surface of the fifth lens is convex, so that the light is further converged, realizing the reduction of the angle between the edge principal light and the normal of the imaging surface, thereby realizing the improvement of the relative illumination of the edge field of view.

[0118] The sixth lens may have positive focal power or negative focal power, and the first side surface of the sixth lens is concave and the second side surface is convex. When the sixth lens has positive focal power, the sixth lens is preferably an aspherical lens, and the light trend is stable, which can improve the astigmatism and field curvature of the imaging, improve the resolution of the optical system, and reduce the cone angle and the incident angle of the main light when the edge field of view light beam reaches the imaging surface; the shape of the sixth lens is concave and convex, and the lens shape is gentle. The large temperature change has little effect on the focal length of the sixth lens, which is conducive to the whole optical system to maintain stable performance within a large temperature change range; the second side surface is convex, which is conducive to increasing the cone angle when the light reaches the imaging surface and reducing the incident angle of the main light, converging light with a larger aperture, and increasing the amount of light entering the optical lens. When the sixth lens has negative focal power, the sixth lens is preferably an aspherical lens, which is conducive to adjusting the aberration of the large field of view angle at the edge, and can improve the large-angle resolution of the central area.

[0119] The present application adopts six lenses, and by optimizing the optical focal length and surface shape of each lens, the optical lens of the present invention has at least one beneficial effect of high relative illumination, long back focal length, high resolution, and low cost.

[0120] In this embodiment, the first side surface of the first lens is a concave surface. When the first side surface of the first lens is a concave surface, it can avoid contact and friction between the lens and the surrounding, which is beneficial to the protection of the lens and the film layer; the second side surface is a concave surface, which can quickly diverge the large-angle light passing through the first side surface of the first lens, which is beneficial to the correction of the aberration of the large-angle light by the rear optical system, and achieve high resolution.

[0121] In this embodiment, the first side surface of the first lens is a convex surface. When the first side surface of the first lens is a convex surface, it can collect as much light of a large field of view as possible to enter the rear optical system, and in actual use environments such as rainy and snowy weather, it is conducive to the sliding of water droplets and reduces the impact on imaging.

[0122] In this embodiment, the second side surface of the second lens is a convex surface. When the second side surface of the second lens is a convex surface, the shape is biconvex, and the lens shape is gentle, so that the divergent light can smoothly enter the rear, which is easy to lengthen the distance between the first lens and the second lens, and reduce the aperture and sensitivity of the rear group of the system.

[0123] In this embodiment, the second side surface of the second lens is a concave surface. When the second side surface of the second lens is a concave surface, the lens shape is gentle, so that the divergent light converges and smoothly enters the rear, further making the light trend smoothly transition, which can reduce light energy loss and is beneficial to the illumination of the peripheral field of view.

[0124] In this embodiment, the third lens has positive focal power. When the third lens has positive focal power, the third lens is preferably an aspherical lens with a meniscus shape, which has a convergence effect on light, which is beneficial to reduce the total length of the system, increase the aperture of the optical lens, and increase the amount of light entering.

[0125] In this embodiment, the third lens has negative optical power. When the third lens has negative optical power, the third lens is preferably an aspherical lens in the shape of a meniscus, which can receive and diverge the front light, so that the edge field of view light beam reaches the third lens with a higher height and a wider width, thereby improving the relative illumination of the edge field of view.

[0126] In this embodiment, the first side surface of the fourth lens is a convex surface. When the first side surface of the fourth lens is a convex surface, the edge field light is deflected downward (toward the center direction) after passing through the first side surface of the fourth lens, thereby reducing the aperture of the back-end system.

[0127] In this embodiment, the first side surface of the fourth lens is a concave surface. When the first side surface of the fourth lens is a concave surface, the shape of the fourth lens is biconcave, and the light rays diverge before and after passing through the fourth lens, and the edge light rays and the central light rays of each field of view are clearly distinguished, which is beneficial to the aberration correction of the center and edge light rays of each field of view, and is beneficial to achieving high resolution.

[0128] In this embodiment, the second side surface of the fifth lens is a concave surface. When the second side surface of the fifth lens is a concave surface, the fifth lens is convex-concave, has positive optical power, and is a meniscus shape convex to the first side, collects the light entering through the fourth lens, and makes the light transition smoothly to the rear, reduces the height of the light incident to the rear, and thus reduces the rear group sensitivity of the system.

[0129] In this embodiment, the second side surface of the fifth lens is a convex surface. When the second side surface of the fifth lens is a convex surface, the fifth lens is biconvex, so that the divergent light converges and enters the rear smoothly, and further makes the light trend transition smoothly; the second side surface of the fifth lens is a convex surface, so that the light is further converged, and the angle between the edge main light and the normal line of the imaging surface is reduced, thereby achieving an improvement in the relative illumination of the edge field of view.

[0130] In this embodiment, the sixth lens has positive focal power. When the sixth lens has positive focal power, the sixth lens is preferably an aspherical lens, and the light trend is stable, which can improve the astigmatism and field curvature of the imaging, improve the resolution of the optical system, and reduce the cone angle and the incident angle of the main light when the edge field of view light beam reaches the imaging surface; the sixth lens is concave and convex, the lens shape is gentle, and the large temperature change has a small effect on the focal length of the sixth lens, which is conducive to the whole optical system to maintain stable performance within a large temperature change range; the second side surface is convex, which is conducive to increasing the cone angle when the light reaches the imaging surface and reducing the incident angle of the main light, converging light with a larger aperture, and increasing the amount of light entering the optical lens.

[0131] In this embodiment, the sixth lens has negative power. When the sixth lens has negative power, the sixth lens is preferably an aspherical lens, which is beneficial for adjusting the aberration of the edge large field angle and improving the large angle resolution of the central area.

[0132] In this embodiment, the fourth lens and the fifth lens are glued together to form a double glued lens. By setting a double glued lens, chromatic aberration can be effectively corrected, the total length of the optical lens can be reduced, and the light can be smoothly transitioned to the rear system, which can optimize the CRA, illumination, distortion and other performances of the optical system. The fourth lens has negative focal length, and the edge light and the central light of each field of view are clearly distinguished, which is conducive to the aberration correction of the center and edge light of each field of view, and is conducive to achieving high resolution. The fifth lens has positive focal power and collects light entering through the fourth lens, so that the light transitions smoothly to the rear and reduces the height of the light incident to the rear; the fourth lens is made of a material with a high refractive index and a low Abbe number, and the fifth lens is made of a material with a relatively low refractive index and a high Abbe number. The bonding of the lenses made of the two materials can effectively correct the chromatic aberration of the optical system; the number of assembled components between the fourth lens and the fifth lens is reduced, which is conducive to reducing the number of processes and the overall weight, and reducing costs; at the same time, the loss of light energy caused by reflection between the lenses is reduced, the illumination of the imaging surface is improved, and the ghost image is weakened; because the light transitions smoothly when passing through the bonding surface, the sensitivity to tolerances such as eccentricity and tilt between the two lenses is low, so the tolerance sensitivity of the lens during assembly can be reduced; it is also conducive to the reasonable distribution of focal lengths, and both lenses are made of glass, which helps to achieve thermal compensation and improve the performance of the optical lens at different temperatures.

[0133] In this embodiment, the sixth lens is provided with a recurve. Specifically, the second side surface of the sixth lens is provided with a recurve, which is conducive to balancing aberrations and improving resolution. By arranging the aperture between the second lens and the third lens, it is conducive to effectively converging the light entering the optical system, reducing the lens diameter at the rear end of the optical system, and reducing the assembly sensitivity of the system.

[0134] In this embodiment, the third lens and the sixth lens are both aspherical lenses. The use of aspherical lenses for the third lens and the sixth lens is conducive to having a large angle resolution in the central area and improving the resolution; it is conducive to improving field curvature and astigmatism and improving the resolution capability.

[0135] In this embodiment, the optical lens further includes an aperture, which is disposed between the second lens and the third lens. The aperture is located between the second lens and the third lens, which is beneficial to the effective convergence of light entering the optical system, reducing the lens aperture at the rear end of the optical system, and reducing the assembly sensitivity of the system.

[0136] In this embodiment, the curvature radius R62 of the second side surface of the sixth lens satisfies the whole focal length value F of the optical lens group: R62 / F≤-0.1. To meet this condition, the second side surface of the sixth lens adopts a convex surface, which is conducive to increasing the cone angle when the light reaches the imaging surface and reducing the incident angle of the main light, converging light with a larger aperture, and improving the light intake and relative illumination of the optical lens. Preferably, R62 / F≤-0.5.

[0137] In this embodiment, the maximum field of view FOV of the optical lens, the focal length value F of the entire set of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥40. Satisfying this conditional expression is conducive to simultaneously satisfying telephoto and large field of view, and taking into account large angular resolution and large deformation. Preferably, (FOV×F) / H≥50.

[0138] In this embodiment, the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface of the optical lens, and the focal length value F of the entire group of the optical lens satisfy the following: TTL / F≤7. When this condition is satisfied, the ratio of the total length of the optical lens to the focal length of the optical lens is ensured to be small when the focal length remains unchanged, and the total length of the optical lens is small, which is conducive to the realization of miniaturization. Preferably, TTL / F≤5.5.

[0139] In this embodiment, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface 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 satisfy the following conditions: TTL / H / FOV≤0.2. This conditional expression is satisfied to ensure that TTL is short under the same imaging surface, and the miniaturization of the optical lens can be achieved. Preferably, TTL / H / FOV≤0.12.

[0140] In this embodiment, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field angle of the optical lens satisfy the following condition: TTL / D≤5. When this condition is satisfied, the entire optical system becomes more compact and smaller while the aperture of the optical lens remains unchanged. Preferably, TTL / D≤3.5.

[0141] In this embodiment, the focal length value F of the entire optical lens, the arc value θ of the maximum field angle of the optical lens, and the maximum light aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: (F*θ) / D≥0.1. Satisfying this conditional expression can make the front port diameter of the optical lens smaller and reduce the imaging system volume of the optical lens. Preferably, (F*θ) / D≥0.4.

[0142] In this embodiment, the maximum aperture D of the first side surface 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 satisfy the following relationship: D / H / FOV≤0.15. When this conditional expression is satisfied, the front port diameter is kept small while the maximum field of view image height of the optical lens and the field of view angle corresponding to the maximum field of view image height remain unchanged, and miniaturization can be achieved. Preferably, D / H / FOV≤0.05.

[0143] In this embodiment, the maximum aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the focal length value F of the entire optical lens group satisfy: D / H / F≤1.5. When this conditional expression is satisfied, the optical lens can be provided with the characteristics of a large target surface and a small aperture under the condition of a fixed focal length. Preferably, D / H / F≤0.8.

[0144] In this embodiment, the image height H corresponding to the maximum field angle of the optical lens, the focal length value F of the entire optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.15. This conditional expression is satisfied to ensure that the focal length of the optical lens is increased while the field angle of the optical lens and the size of the imaging surface remain unchanged, and to highlight the imaging effect of the central area of ​​the imaging surface of the optical lens. Preferably, |(HF*θ) / (F*θ)|≤0.09.

[0145] In this embodiment, the optical back focus of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface, and the optical total length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens, satisfy the following conditions: BFL / TTL≥0.2. This conditional expression is controlled to meet the special requirements of the back focus length of the optical lens, and space can also be reserved for the installation and focusing of optical elements to avoid interference with the mechanism. Preferably, BFL / TTL≥0.22.

[0146] In this embodiment, the focal length value F of the entire optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.1≤F / H≤3. Satisfying this conditional expression is conducive to controlling the focal length and image height within a certain range, which is conducive to improving the resolution. Preferably, 0.3≤F / H≤1.5.

[0147] In this embodiment, the air gap d2 between the first lens and the second lens and the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens, satisfy: d2 / TTL≥0.1. This conditional expression is controlled so that the distance between the first lens and the second lens is far, so that the light diverged by the first lens can smoothly enter the rear of the system, which can reduce the aperture and sensitivity of the rear end of the system, and is conducive to improving the resolution. Preferably, d2 / TTL≥0.15.

[0148] In this embodiment, the focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤2.5. Meeting this conditional expression is conducive to achieving a small FNO, increasing the amount of light passing, and a large entrance pupil diameter is conducive to improving relative illumination. Preferably, F / ENPD≤2.3.

[0149] In this embodiment, the focal length value F of the entire optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: F / ENPD / D≤1.2. By controlling this conditional expression, a small aperture is ensured under the premise of satisfying a high light flux, thereby realizing miniaturization of the optical lens. Preferably, F / ENPD / D≤0.5.

[0150] In this embodiment, the aperture diameter DST of the optical lens and the focal length value F of the entire optical lens group satisfy: DST / F≥0.08. Satisfying this conditional expression ensures that the ratio of the aperture diameter to the effective focal length is large, thereby ensuring that the aperture of the optical lens is large, which is conducive to achieving high light throughput. Preferably, DST / F≥0.25.

[0151] In this embodiment, the curvature radius R61 of the first side surface of the sixth lens and the curvature radius R62 of the second side surface of the sixth lens satisfy: 0.1≤R61 / R62≤3. This conditional expression is satisfied so that the curvature radii of the two surfaces of the sixth lens are close, which is beneficial for the entire optical system to maintain stable performance within a larger temperature variation range. Preferably, 0.2≤R61 / R62≤2.2.

[0152] In this embodiment, the image height H corresponding to the maximum field angle of the optical lens, the focal length value F of the entire optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: 0.1≤(H / 2) / (F*tan(θ / 2))≤2. Controlling the ratio of the actual image height to the ideal image height can achieve a high angular resolution. Preferably, 0.4≤(H / 2) / (F*tan(θ / 2))≤1.5.

[0153] In this embodiment, the optical focal length of the optical lens is Combined power of the second and third lenses Satisfy between: Satisfying this conditional expression can effectively correct the astigmatism of the optical lens and improve the resolution of the optical lens.

[0154] In this embodiment, the sag height SAG31 of the first side surface of the third lens and the sag height SAG32 of the second side surface of the third lens satisfy: 0.01≤|SAG31 / SAG32|≤3. Satisfying this conditional expression makes the sag heights of the two side surfaces of the third lens close, which is conducive to smooth transition of light and lowering the sensitivity of the lens. Preferably, 0.15≤|SAG31 / SAG32|≤2.

[0155] In this embodiment, the sag height SAG61 of the first side surface of the sixth lens and the sag height SAG62 of the second side surface of the sixth lens satisfy: 0.01≤|SAG61 / SAG62|≤5. This conditional expression is satisfied so that the sag heights of the two side surfaces of the sixth lens are close, which is beneficial to the smooth transition of light and the reduction of the sensitivity of the lens. Preferably, 0.25≤|SAG61 / SAG62|≤4.

[0156] In this embodiment, the radius of curvature R61 of the first side surface of the sixth lens, the radius of curvature R62 of the second side surface of the sixth lens and the center thickness d10 of the sixth lens satisfy: 0.1≤R61 / (R62+d10)≤3.5. The special lens shape setting (the shape is close to concentric circles) makes the peripheral light and the central light have an optical path difference, diverges the central light, enters the rear optical system, and reduces the front port diameter of the optical lens, reduces the volume, and is conducive to miniaturization and cost reduction. Preferably, 0.25≤R61 / (R62+d10)≤2.8.

[0157] Embodiment 2

[0158] like Figures 1 to 8 As shown, the optical lens includes, from the first side to the second side, in sequence: a first lens with negative optical power; a second lens with positive optical power; a third lens with optical power; a fourth lens with negative optical power; a fifth lens with positive optical power; a sixth lens with optical power; the radius of curvature R62 of the second side surface of the sixth lens and the focal length value F of the entire group of the optical lens satisfy: R62 / F≤-0.1. To meet this conditional formula, the second side surface of the sixth lens adopts a convex surface, which is conducive to increasing the cone angle when the light reaches the imaging surface and reducing the incident angle of the main light, converging light with a larger aperture, and improving the light intake and relative illumination of the optical lens. Preferably, R62 / F≤-0.5.

[0159] In this embodiment, the first side surface of the first lens is a concave surface, and the second side surface is a concave surface. The first lens has a negative optical power and has a divergent effect on the light passing through it. Under the same field of view, the light emitted through the second side surface of the first lens can make the subsequent optical system have a larger light receiving surface; when the first side surface of the first lens is a concave surface, it can avoid contact and friction between the lens and the surrounding, which is beneficial to the protection of the lens and the film layer; the second side surface is a concave surface, which can quickly diverge the large-angle light passing through the first side surface of the first lens, which is beneficial to the correction of the aberration of the large-angle light by the rear optical system and achieve high resolution.

[0160] In this embodiment, the first side surface of the first lens is convex, and the second side surface is concave. When the first side surface of the first lens is convex, it can collect as much light of a large field of view as possible to enter the rear optical system, and in actual use environments such as rainy and snowy weather, it is conducive to the sliding of water droplets, reducing the impact on imaging.

[0161] In this embodiment, the first side surface of the second lens is convex, and the second side surface is convex. Glass with positive focal power, high refractive index and low Abbe number can smoothly receive the light diverged by the first lens, and complement the chromatic aberration with the glass with low refractive index and high Abbe number of the first lens. When the second side surface of the second lens is convex, the shape is biconvex, and the lens shape is gentle, so that the diverged light can smoothly enter the rear, which is easy to lengthen the distance between the first lens and the second lens, and reduce the aperture and sensitivity of the rear group of the system.

[0162] In this embodiment, the first side surface of the second lens is convex, and the second side surface is concave. When the second side surface of the second lens is concave, the lens shape is gentle, so that the divergent light converges and smoothly enters the rear, further making the light trend smoothly transition, which can reduce light energy loss and is beneficial to the illumination of the peripheral field of view.

[0163] In this embodiment, the third lens has positive focal power, the first side surface of the third lens is concave, and the second side surface is convex. The third lens is preferably an aspherical lens with a meniscus shape, which has a convergence effect on light, which is beneficial to reduce the total length of the system, increase the aperture of the optical lens, and increase the amount of light entering.

[0164] In this embodiment, the third lens has negative optical power, the first side surface of the third lens is concave, and the second side surface is convex. The third lens is preferably an aspherical lens in the shape of a meniscus, which can receive and diverge the front light, so that the edge field of view light beam reaches the third lens with a higher height and a wider width, thereby improving the relative illumination of the edge field of view.

[0165] In this embodiment, the first side surface of the fourth lens is convex, and the second side surface is concave. When the first side surface of the fourth lens is convex, the edge field light is deflected downward (toward the center) after passing through the first side surface of the fourth lens, thereby reducing the aperture of the back-end system.

[0166] In this embodiment, the first side surface of the fourth lens is a concave surface, and the second side surface is a concave surface. When the first side surface of the fourth lens is a concave surface, the shape of the fourth lens is biconcave, and the light rays diverge before and after passing through the fourth lens. The edge light rays and the central light rays of each field of view are clearly distinguished, which is beneficial to the aberration correction of the center and edge light rays of each field of view, and is beneficial to achieving high resolution.

[0167] In this embodiment, the first side surface of the fifth lens is convex, and the second side surface is concave. When the second side surface of the fifth lens is concave, the fifth lens is convex-concave, has positive optical power, and is a meniscus shape convex to the first side, collects the light entering through the fourth lens, and makes the light transition smoothly to the rear, reduces the height of the light incident to the rear, and thus reduces the rear group sensitivity of the system.

[0168] In this embodiment, the first side surface of the fifth lens is a convex surface, and the second side surface is a convex surface. When the second side surface of the fifth lens is a convex surface, the fifth lens is biconvex, so that the divergent light can converge and enter the rear smoothly, and further make the light trend transition smoothly; the second side surface of the fifth lens is a convex surface, so that the light can be further converged, and the angle between the edge main light and the normal line of the imaging surface can be reduced, thereby achieving an improvement in the relative illumination of the edge field of view.

[0169] In this embodiment, the sixth lens has positive focal power, the first side surface of the sixth lens is concave, and the second side surface is convex. When the sixth lens has positive focal power, the sixth lens is preferably an aspherical lens, the light trend is stable, the astigmatism and field curvature of the imaging can be improved, the resolution ability of the optical system can be improved, and the cone angle and the incident angle of the main light when the edge field of view light beam reaches the imaging surface can be reduced; the shape of the sixth lens is concave and convex, the lens shape is gentle, and the large temperature change has little effect on the focal length of the sixth lens, which is conducive to the whole optical system to maintain stable performance within a large temperature change range; the second side surface is convex, which is conducive to increasing the cone angle when the light reaches the imaging surface and reducing the incident angle of the main light, converging light with a larger aperture, and increasing the amount of light entering the optical lens.

[0170] In this embodiment, the sixth lens has negative optical power, the first side surface of the sixth lens is concave, and the second side surface is convex. When the sixth lens has negative optical power, the sixth lens is preferably an aspherical lens, which is conducive to adjusting the aberration of the edge large field angle and improving the large angle resolution of the central area.

[0171] The present application adopts six lenses, and by optimizing the optical focal length and surface shape of each lens, the optical lens of the present invention has at least one beneficial effect of high relative illumination, long back focal length, high resolution, and low cost.

[0172] In this embodiment, the fourth lens and the fifth lens are glued together to form a double glued lens. By setting a double glued lens, chromatic aberration can be effectively corrected, the total length of the optical lens can be reduced, and the light can be smoothly transitioned to the rear system, which can optimize the CRA, illumination, distortion and other performances of the optical system. The fourth lens has negative focal length, and the edge light and the central light of each field of view are clearly distinguished, which is conducive to the aberration correction of the center and edge light of each field of view, and is conducive to achieving high resolution. The fifth lens has positive focal power and collects light entering through the fourth lens, so that the light transitions smoothly to the rear and reduces the height of the light incident to the rear; the fourth lens is made of a material with a high refractive index and a low Abbe number, and the fifth lens is made of a material with a relatively low refractive index and a high Abbe number. The bonding of the lenses made of the two materials can effectively correct the chromatic aberration of the optical system; the number of assembled components between the fourth lens and the fifth lens is reduced, which is conducive to reducing the number of processes and the overall weight, and reducing costs; at the same time, the loss of light energy caused by reflection between the lenses is reduced, the illumination of the imaging surface is improved, and the ghost image is weakened; because the light transitions smoothly when passing through the bonding surface, the sensitivity to tolerances such as eccentricity and tilt between the two lenses is low, so the tolerance sensitivity of the lens during assembly can be reduced; it is also conducive to the reasonable distribution of focal lengths, and both lenses are made of glass, which helps to achieve thermal compensation and improve the performance of the optical lens at different temperatures.

[0173] In this embodiment, the sixth lens is provided with a recurve. Specifically, the second side surface of the sixth lens is provided with a recurve, which is conducive to balancing aberrations and improving resolution. By arranging the aperture between the second lens and the third lens, it is conducive to effectively converging the light entering the optical system, reducing the lens diameter at the rear end of the optical system, and reducing the assembly sensitivity of the system.

[0174] In this embodiment, the third lens and the sixth lens are both aspherical lenses. The use of aspherical lenses for the third lens and the sixth lens is conducive to having a large angle resolution in the central area and improving the resolution; it is conducive to improving field curvature and astigmatism and improving the resolution capability.

[0175] In this embodiment, the optical lens further includes an aperture, which is disposed between the second lens and the third lens. The aperture is located between the second lens and the third lens, which is beneficial to the effective convergence of light entering the optical system, reducing the lens aperture at the rear end of the optical system, and reducing the assembly sensitivity of the system.

[0176] In this embodiment, the maximum field of view FOV of the optical lens, the focal length value F of the entire set of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥40. Satisfying this conditional expression is conducive to simultaneously satisfying telephoto and large field of view, and taking into account large angular resolution and large deformation. Preferably, (FOV×F) / H≥50.

[0177] In this embodiment, the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface of the optical lens, and the focal length value F of the entire group of the optical lens satisfy the following: TTL / F≤7. When this condition is satisfied, the ratio of the total length of the optical lens to the focal length of the optical lens is ensured to be small when the focal length remains unchanged, and the total length of the optical lens is small, which is conducive to the realization of miniaturization. Preferably, TTL / F≤5.5.

[0178] In this embodiment, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface 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 satisfy the following conditions: TTL / H / FOV≤0.2. This conditional expression is satisfied to ensure that TTL is short under the same imaging surface, and the miniaturization of the optical lens can be achieved. Preferably, TTL / H / FOV≤0.12.

[0179] In this embodiment, the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens, and the maximum aperture D of the first side of the first lens corresponding to the maximum field angle of the optical lens satisfy the following condition: TTL / D≤5. When this condition is satisfied, the entire optical system becomes more compact and smaller while the aperture of the optical lens remains unchanged. Preferably, TTL / D≤3.5.

[0180] In this embodiment, the focal length value F of the entire optical lens, the arc value θ of the maximum field angle of the optical lens, and the maximum light aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: (F*θ) / D≥0.1. Satisfying this conditional expression can make the front port diameter of the optical lens smaller and reduce the imaging system volume of the optical lens. Preferably, (F*θ) / D≥0.4.

[0181] In this embodiment, the maximum aperture D of the first side surface 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 satisfy the following relationship: D / H / FOV≤0.15. When this conditional expression is satisfied, the front port diameter is kept small while the maximum field of view image height of the optical lens and the field of view angle corresponding to the maximum field of view image height remain unchanged, and miniaturization can be achieved. Preferably, D / H / FOV≤0.05.

[0182] In this embodiment, the maximum aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the focal length value F of the entire optical lens group satisfy: D / H / F≤1.5. When this conditional expression is satisfied, the optical lens can be provided with the characteristics of a large target surface and a small aperture under the condition of a fixed focal length. Preferably, D / H / F≤0.8.

[0183] In this embodiment, the image height H corresponding to the maximum field angle of the optical lens, the focal length value F of the entire optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.15. This conditional expression is satisfied to ensure that the focal length of the optical lens is increased while the field angle of the optical lens and the size of the imaging surface remain unchanged, and to highlight the imaging effect of the central area of ​​the imaging surface of the optical lens. Preferably, |(HF*θ) / (F*θ)|≤0.09.

[0184] In this embodiment, the optical back focus of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface, and the optical total length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens, satisfy the following conditions: BFL / TTL≥0.2. This conditional expression is controlled to meet the special requirements of the back focus length of the optical lens, and space can also be reserved for the installation and focusing of optical elements to avoid interference with the mechanism. Preferably, BFL / TTL≥0.22.

[0185] In this embodiment, the focal length value F of the entire optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 0.1≤F / H≤3. Satisfying this conditional expression is conducive to controlling the focal length and image height within a certain range, which is conducive to improving the resolution. Preferably, 0.3≤F / H≤1.5.

[0186] In this embodiment, the air gap d2 between the first lens and the second lens and the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface of the optical lens, satisfy: d2 / TTL≥0.1. This conditional expression is controlled so that the distance between the first lens and the second lens is far, so that the light diverged by the first lens can smoothly enter the rear of the system, which can reduce the aperture and sensitivity of the rear end of the system, and is conducive to improving the resolution. Preferably, d2 / TTL≥0.15.

[0187] In this embodiment, the focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤2.5. Meeting this conditional expression is conducive to achieving a small FNO, increasing the amount of light passing, and a large entrance pupil diameter is conducive to improving relative illumination. Preferably, F / ENPD≤2.3.

[0188] In this embodiment, the focal length value F of the entire optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens satisfy: F / ENPD / D≤1.2. By controlling this conditional expression, a small aperture is ensured under the premise of satisfying a high light flux, thereby realizing miniaturization of the optical lens. Preferably, F / ENPD / D≤0.5.

[0189] In this embodiment, the aperture diameter DST of the optical lens and the focal length value F of the entire optical lens group satisfy: DST / F≥0.08. Satisfying this conditional expression ensures that the ratio of the aperture diameter to the effective focal length is large, thereby ensuring that the aperture of the optical lens is large, which is conducive to achieving high light throughput. Preferably, DST / F≥0.25.

[0190] In this embodiment, the curvature radius R61 of the first side surface of the sixth lens and the curvature radius R62 of the second side surface of the sixth lens satisfy: 0.1≤R61 / R62≤3. This conditional expression is satisfied so that the curvature radii of the two surfaces of the sixth lens are close, which is beneficial for the entire optical system to maintain stable performance within a larger temperature variation range. Preferably, 0.2≤R61 / R62≤2.2.

[0191] In this embodiment, the image height H corresponding to the maximum field angle of the optical lens, the focal length value F of the entire optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: 0.1≤(H / 2) / (F*tan(θ / 2))≤2. Controlling the ratio of the actual image height to the ideal image height can achieve a high angular resolution. Preferably, 0.4≤(H / 2) / (F*tan(θ / 2))≤1.5.

[0192] In this embodiment, the optical focal length of the optical lens is Combined power of the second and third lenses Satisfy between: Satisfying this conditional expression can effectively correct the astigmatism of the optical lens and improve the resolution of the optical lens.

[0193] In this embodiment, the sag height SAG31 of the first side surface of the third lens and the sag height SAG32 of the second side surface of the third lens satisfy: 0.01≤|SAG31 / SAG32|≤3. Satisfying this conditional expression makes the sag heights of the two side surfaces of the third lens close, which is conducive to smooth transition of light and lowering the sensitivity of the lens. Preferably, 0.15≤|SAG31 / SAG32|≤2.

[0194] In this embodiment, the sag height SAG61 of the first side surface of the sixth lens and the sag height SAG62 of the second side surface of the sixth lens satisfy: 0.01≤|SAG61 / SAG62|≤5. This conditional expression is satisfied so that the sag heights of the two side surfaces of the sixth lens are close, which is beneficial to the smooth transition of light and the reduction of the sensitivity of the lens. Preferably, 0.25≤|SAG61 / SAG62|≤4.

[0195] In this embodiment, the radius of curvature R61 of the first side surface of the sixth lens, the radius of curvature R62 of the second side surface of the sixth lens and the center thickness d10 of the sixth lens satisfy: 0.1≤R61 / (R62+d10)≤3.5. The special lens shape setting (the shape is close to concentric circles) makes the peripheral light and the central light have an optical path difference, diverges the central light, enters the rear optical system, and reduces the front port diameter of the optical lens, reduces the volume, and is conducive to miniaturization and cost reduction. Preferably, 0.25≤R61 / (R62+d10)≤2.8.

[0196] Optionally, the optical lens may further include a color filter for correcting color deviation and a protective glass for protecting a photosensitive element located on the imaging surface.

[0197] The optical lens in the present application may use multiple lenses, such as the six lenses mentioned above. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased. The characteristics of aspherical lenses are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike spherical lenses with constant curvature from the center of the lens to the periphery of the lens, aspherical lenses have better curvature radius characteristics, and have the advantages of improving distortion aberrations and improving astigmatism aberrations. After using aspherical lenses, the aberrations that occur during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0198] In an exemplary embodiment, the present solution does not limit the plastic and glass of the lens. If the focus is on temperature performance, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can all be glass lenses. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve the stability of the system. At the same time, the use of glass material can avoid the lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the optical lens. For example, the temperature range of the optical lens with an all-glass design is wider, and stable optical performance can be maintained in the range of -40°C to 105°C. Specifically, when focusing on resolution quality and reliability, the first lens to the sixth lens can all be glass aspherical lenses. Of course, in applications where temperature stability requirements are lower, the first lens to the sixth lens in the optical lens can also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first lens to the sixth lens in the optical lens can also be made of a combination of plastic and glass.

[0199] The present application also provides an electronic device, comprising the above-mentioned optical lens and an imaging element that converts an optical image formed by the optical lens into an electrical signal. The imaging element may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The electronic device may be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The electronic device is equipped with the above-described optical lens.

[0200] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical lens is not limited to including six lenses. If necessary, the optical lens may also include other numbers of lenses.

[0201] The following further describes examples of specific surface shapes and parameters of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0202] It should be noted that any one of the following examples 1 to 8 is applicable to all embodiments of the present application.

[0203] Example 1

[0204] like Figure 1 The figure shows a schematic diagram of the optical lens structure of Example 1.

[0205] like Figure 1 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA. The first lens L1 has a negative optical focal length, the first side surface S1 of the first lens is a concave surface, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has a positive optical focal length, the first side surface S3 of the second lens is a convex surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has a positive optical focal length, the first side surface S6 of the third lens is a concave surface, and the second side surface S7 of the third lens is a convex surface. The fourth lens L4 has a negative optical focal length, the first side surface S8 of the fourth lens is a convex surface, and the second side surface S9 of the fourth lens is a concave surface. The fifth lens L5 has a positive optical focal length, the first side surface S9 of the fifth lens is a convex surface, and the second side surface S10 of the fifth lens is a concave surface. The sixth lens L6 has positive power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. Light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0206] In this example, the total effective focal length F of the optical lens is 4.140 mm, the maximum field of view FOV of the optical lens is 80.000°, and the total length TTL of the optical lens is 18.746 mm.

[0207] Table 1 shows a basic structural parameter table of the optical lens of Example 1, wherein the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0208] Surf Radius Thickness Nd Vd 1 -79.730 1.300 1.50 81.61 2 3.498 5.323 3 5.904 0.861 1.88 40.87 4 15.226 0.387 5 Infinity 0.272 6 -8.521 1.461 1.53 55.58 7 -4.639 0.110 8 5.589 0.626 1.92 18.90 9 2.826 1.779 1.83 42.73 10 6.620 0.869 11 -7.075 1.045 1.53 55.58 12 -4.464 0.350 13 Infinity 0.950 1.52 64.20 14 Infinity 3.4136 IMA / /

[0209] Table 1

[0210] In Example 1, the surface shape of each aspheric lens can be defined by but not limited to the following aspheric formula:

[0211]

[0212] 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; A, B, C, D, and E are all high-order coefficients. Table 2 below shows the cone coefficient k and the high-order coefficients A, B, C, D, E, F, and G that can be used for the aspheric lens surfaces S6, S7, S11, and S12 in Example 1.

[0213] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 5.5870 4.2536E-04 1.2460E-04 6.3702E-06 -1.0704E-06 6.4171E-07 -8.9226E-08 8.6047E-09 7 -2.8055 -2.0566E-03 1.8320E-04 -3.0740E-06 -5.6411E-06 1.7178E-06 -1.1195E-07 -7.9193E-09 11 7.3107 -1.2603E-03 -9.4083E-04 4.2935E-04 -1.0960E-04 1.1936E-05 -6.0849E-08 -3.6426E-08 12 -6.2459 -9.1288E-03 5.0368E-04 -4.2984E-05 -1.1792E-06 5.5753E-07 -1.2863E-07 9.1856E-09

[0214] Table 2

[0215] Example 2

[0216] like Figure 2 FIG. 1 is a schematic diagram of the optical lens structure of Example 2. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted.

[0217] like Figure 2 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0218] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S6 of the third lens is concave, and the second side surface S7 of the third lens is convex. The fourth lens L4 has negative power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is concave. The fifth lens L5 has positive power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens L6 has positive power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. The light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0219] In this example, the total effective focal length F of the optical lens is 4.148 mm, the maximum field of view FOV of the optical lens is 80.000°, and the total length TTL of the optical lens is 18.753 mm.

[0220] Table 3 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0221] Surf Radius Thickness Nd Vd 1 -78.410 1.200 1.50 81.61 2 3.492 5.325 3 5.904 0.917 1.88 40.87 4 15.223 0.417 5 Infinity 0.238 6 -8.518 1.483 1.53 55.58 7 -4.642 0.110 8 5.590 0.626 1.92 18.90 9 2.827 1.778 1.83 42.73 10 6.616 0.869 11 -7.077 1.076 1.53 55.58 12 -4.461 0.350 13 Infinity 0.950 1.52 64.20 14 Infinity 3.414 IMA / /

[0222] Table 3

[0223] Table 4 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, G that can be used for the aspheric lens surfaces S6, S7, S11 and S12 in Example 2.

[0224] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 5.5963 4.2288E-04 1.2381E-04 6.0851E-06 -1.1683E-06 6.0939E-07 -9.9688E-08 5.2534E-09 7 -2.8023 -2.0604E-03 1.8176E-04 -3.3988E-06 -5.6954E-06 1.7131E-06 -1.1073E-07 -7.0764E-09 11 7.2985 -1.2387E-03 -9.3560E-04 4.3023E-04 -1.0947E-04 1.1948E-05 -6.1246E-08 -3.7120E-08 12 -6.2294 -9.1329E-03 5.0338E-04 -4.3092E-05 -1.1980E-06 5.5575E-07 -1.2854E-07 9.2829E-09

[0225] Table 4

[0226] Example 3

[0227] like Figure 3 The figure shows a schematic diagram of the optical lens structure of Example 3.

[0228] like Figure 3 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0229] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is convex. The third lens L3 has positive power, the first side surface S6 of the third lens is concave, and the second side surface S7 of the third lens is convex. The fourth lens L4 has negative power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is concave. The fifth lens L5 has positive power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens L6 has positive power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. The light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0230] In this example, the second side surface S12 of the sixth lens is set to be reversely curved.

[0231] In this example, the total effective focal length F of the optical lens is 5.069 mm, the maximum field of view FOV of the optical lens is 80.000°, and the total length TTL of the optical lens is 19.103 mm.

[0232] Table 5 shows the basic structural parameter table of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0233]

[0234]

[0235] Table 5

[0236] Table 6 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, G that can be used for the aspherical lens surfaces S6, S7, S11 and S12 in Example 3.

[0237] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 4.1479 2.1220E-03 4.4732E-04 -3.1003E-05 2.4218E-06 5.0315E-07 -1.1295E-07 8.1226E-09 7 -7.1227 -1.1507E-03 5.7334E-04 -4.1075E-05 -1.2057E-06 1.8231E-06 -2.0797E-07 3.4758E-10 11 6.4999 5.4809E-03 -7.9393E-04 5.6280E-04 -1.2953E-04 1.3071E-05 -1.3969E-07 -3.1048E-08 12 -14.8330 -9.4430E-04 6.4042E-04 -1.0890E-05 -5.3218E-06 8.2914E-07 -5.5489E-08 1.7199E-09

[0238] Table 6

[0239] Example 4

[0240] like Figure 4 The figure shows a schematic diagram of the optical lens structure of Example 4.

[0241] like Figure 4 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0242] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is convex. The third lens L3 has positive power, the first side surface S6 of the third lens is concave, and the second side surface S7 of the third lens is convex. The fourth lens L4 has negative power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is concave. The fifth lens L5 has positive power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens L6 has positive power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. The light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0243] In this example, the second side surface S12 of the sixth lens is set to be reversely curved.

[0244] In this example, the total effective focal length F of the optical lens is 4.7624 mm, the maximum field of view FOV of the optical lens is 80.000°, and the total length TTL of the optical lens is 19.084 mm.

[0245] Table 7 shows the basic structural parameter table of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0246] Surf Radius Thickness Nd Vd 1 -19.4125 1.3000 1.50 81.59 2 3.7356 4.3009 3 7.7449 1.7263 1.83 42.73 4 -18.2029 0.1069 5 Infinity 0.3382 6 -7.6091 1.0275 1.53 55.58 7 -6.7251 0.1000 8 10.2493 0.6625 1.92 18.90 9 3.7235 1.4463 1.83 42.73 10 62.2853 1.1817 11 -7.4563 2.0297 1.53 55.58 12 -6.3821 0.4272 13 Infinity 0.9500 1.52 64.21 14 Infinity 3.4867 IMA / /

[0247] Table 7

[0248] Table 8 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, G that can be used for the aspheric lens surfaces S6, S7, S11 and S12 in Example 4.

[0249] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 4.1641 2.1075E-03 4.4674E-04 -3.0893E-05 2.4405E-06 4.9779E-07 -1.1733E-07 8.1226E-09 7 -7.2503 -1.1426E-03 5.6907E-04 -4.2155E-05 -1.3309E-06 1.8334E-06 -1.9703E-07 3.4758E-10 11 6.4856 5.5353E-03 -7.8048E-04 5.6422E-04 -1.2945E-04 1.3069E-05 -1.4192E-07 -3.1630E-08 12 -12.2660 -1.0909E-03 6.4091E-04 -1.0039E-05 -5.2115E-06 8.3750E-07 -5.5604E-08 1.5201E-09

[0250] Table 8

[0251] Example 5

[0252] like Figure 5 The figure shows a schematic diagram of the optical lens structure of Example 5.

[0253] like Figure 5As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0254] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S6 of the third lens is concave, and the second side surface S7 of the third lens is convex. The fourth lens L4 has negative power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is concave. The fifth lens L5 has positive power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens L6 has positive power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. The light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0255] In this example, the total effective focal length F of the optical lens is 5.037 mm, the maximum field of view FOV of the optical lens is 90.000°, and the total length TTL of the optical lens is 19.108 mm.

[0256] Table 9 shows the basic structural parameter table of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0257] Surf Radius Thickness Nd Vd 1 158.227 1.200 1.50 81.61 2 3.471 4.676 3 6.321 1.276 1.88 40.87 4 18.518 0.702 5 Infinity 0.215 6 -7.746 1.000 1.53 55.58 7 -4.616 0.100 8 5.677 0.694 1.92 18.90 9 2.853 1.886 1.83 42.73 10 7.047 0.957 11 -7.146 1.500 1.53 55.58 12 -4.940 0.443 13 Infinity 0.950 1.52 64.20 14 Infinity 3.508 IMA / /

[0258] Table 9

[0259] Table 10 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, G that can be used for the aspherical lens surfaces S6, S7, S11 and S12 in Example 5.

[0260] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 3.9821 1.0932E-03 1.4305E-04 6.0109E-06 -1.5815E-06 5.0511E-07 -1.1482E-07 8.1226E-09 7 -2.7511 -2.0713E-03 2.0094E-04 -4.4812E-06 -5.9456E-06 1.6087E-06 -1.1651E-07 3.4758E-10 11 7.8084 -1.0341E-03 -8.6894E-04 4.4151E-04 -1.0898E-04 1.1995E-05 2.5634E-18 2.4136E-21 12 -8.0144 -8.0200E-03 5.3607E-04 -3.0157E-05 -8.2664E-07 5.8733E-07 -1.2367E-07 1.0569E-08

[0261] Table 10

[0262] Example 6

[0263] like Figure 6 Shown is a schematic diagram of the optical lens structure of Example 6.

[0264] like Figure 6 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0265] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S6 of the third lens is concave, and the second side surface S7 of the third lens is convex. The fourth lens L4 has negative power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is concave. The fifth lens L5 has positive power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens L6 has positive power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. The light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0266] In this example, the total effective focal length F of the optical lens is 4.750 mm, the maximum field of view FOV of the optical lens is 90.000°, and the total length TTL of the optical lens is 19.282 mm.

[0267] Table 11 shows the basic structural parameter table of the optical lens of Example 6, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0268] Surf Radius Thickness Nd Vd 1 100.000 1.300 1.50 81.61 2 3.441 5.000 3 5.777 1.100 1.88 40.87 4 12.107 0.440 5 Infinity 0.497 6 -8.447 1.100 1.53 55.58 7 -4.578 0.120 8 5.761 0.619 1.92 18.90 9 3.020 1.217 1.83 42.73 10 7.701 1.262 11 -7.618 1.300 1.53 55.58 12 -4.852 0.177 13 Infinity 0.950 1.52 64.20 14 Infinity 4.200 IMA / /

[0269] Table 11

[0270] Table 12 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, G that can be used for the aspherical lens surfaces S6, S7, S11 and S12 in Example 6.

[0271] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 4.3018 9.5397E-04 1.5559E-04 1.1944E-05 6.1179E-07 1.0699E-06 -8.9094E-08 -7.1435E-08 7 -3.0401 -1.8474E-03 2.2445E-04 3.6160E-06 -4.0562E-06 1.8696E-06 -1.3296E-07 -2.9316E-08 11 7.1285 8.2498E-05 -9.9089E-04 4.3427E-04 -1.0949E-04 1.1605E-05 -1.5920E-07 -5.0504E-08 12 -8.2453 -8.0170E-03 4.6860E-04 -3.5503E-05 -8.2283E-07 5.9095E-07 -1.3474E-07 7.1577E-09

[0272] Table 12

[0273] Example 7

[0274] like Figure 7 The figure shows the schematic diagram of the optical lens structure of Example 7.

[0275] like Figure 7 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0276] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is convex. The third lens L3 has negative power, the first side surface S6 of the third lens is concave, and the second side surface S7 of the third lens is convex. The fourth lens L4 has negative power, the first side surface S8 of the fourth lens is concave, and the second side surface S9 of the fourth lens is concave. The fifth lens L5 has positive power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is convex. The sixth lens L6 has negative power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. The light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0277] In this example, the second side surface S12 of the sixth lens is set to be reversely curved.

[0278] In this example, the total effective focal length F of the optical lens is 5.043 mm, the maximum field of view FOV of the optical lens is 100.000°, and the total length TTL of the optical lens is 19.034 mm.

[0279] Table 13 shows the basic structural parameter table of the optical lens of Example 7, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0280] Surf Radius Thickness Nd Vd 1 -132.225 1.200 1.50 81.61 2 3.430 4.105 3 7.153 1.659 1.88 40.87 4 -9.905 0.357 5 Infinity 0.325 6 -3.982 1.000 1.53 55.58 7 -4.736 0.100 8 -34.185 0.550 1.92 18.90 9 5.388 2.136 1.83 42.73 10 -5.747 0.320 11 -4.617 2.026 1.53 55.58 12 -10.286 0.443 13 Infinity 0.950 1.52 64.20 14 Infinity 3.863 IMA / /

[0281] Table 13

[0282] Table 14 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, G that can be used for the aspheric lens surfaces S6, S7, S11 and S12 in Example 7.

[0283] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 -1.1712 1.7470E-03 5.4358E-04 -1.2379E-04 1.1076E-05 1.7535E-06 -2.3808E-07 -2.5353E-08 7 -3.2447 5.9260E-04 9.8951E-04 -1.6060E-04 -2.6449E-06 3.3307E-06 6.8518E-07 -1.6430E-07 11 1.7475 4.9183E-03 -1.1492E-03 6.7165E-04 -1.3677E-04 1.1237E-05 3.9956E-08 -2.0180E-08 12 -34.7080 -1.8122E-03 5.1219E-04 -3.5582E-05 3.1656E-07 6.7515E-07 -1.2057E-07 6.5595E-09

[0284] Table 14

[0285] Example 8

[0286] like Figure 8 Shown is a schematic diagram of the optical lens structure of Example 8.

[0287] like Figure 8 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first side surface S13 of the protective glass, a second side surface S14 of the protective glass, and an imaging surface IMA.

[0288] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is convex. The third lens L3 has negative power, the first side surface S6 of the third lens is concave, and the second side surface S7 of the third lens is convex. The fourth lens L4 has negative power, the first side surface S8 of the fourth lens is concave, and the second side surface S9 of the fourth lens is concave. The fifth lens L5 has positive power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is convex. The sixth lens L6 has negative power, the first side surface S11 of the sixth lens is concave, and the second side surface S12 of the sixth lens is convex. The light from the first side passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface IMA. Since the fourth lens L4 and the fifth lens L5 are cemented to form a doublet lens, the second side surface S9 of the fourth lens and the first side surface S9 of the fifth lens are the same surface.

[0289] In this example, the second side surface S12 of the sixth lens is set to be reversely curved.

[0290] In this example, the total effective focal length F of the optical lens is 4.518 mm, the maximum field of view FOV of the optical lens is 100.000°, and the total length TTL of the optical lens is 18.291 mm.

[0291] Table 15 shows the basic structural parameter table of the optical lens of Example 8, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0292]

[0293]

[0294] Table 15

[0295] Table 16 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, G that can be used for the aspherical lens surfaces S6, S7, S11 and S12 in Example 8.

[0296] Higher order terms / 4 6 8 10 12 14 16 Surf K A B C D E F G 6 -1.3347 2.0828E-03 6.6747E-04 -1.2644E-04 7.0931E-06 3.6904E-07 -7.6685E-08 5.9337E-08 7 -4.9242 1.2390E-03 1.0371E-03 -1.4526E-04 6.4416E-06 1.5523E-06 -1.2278E-07 -1.8752E-09 11 2.1571 8.6255E-03 -1.1638E-03 6.5579E-04 -1.3587E-04 1.1903E-05 -1.2509E-08 1.4086E-10 12 -31.0940 -1.3625E-03 5.9766E-04 -3.3949E-05 -1.1042E-06 5.9719E-07 -1.2603E-07 9.6161E-09

[0297] Table 16

[0298] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17.

[0299]

[0300] Table 17

[0301] Table 18 gives the effective focal length F of the optical lenses of Examples 1 to 8, the effective focal length F1 to F6 of each lens, etc. (unit: mm).

[0302]

[0303] Table 18

[0304] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0305] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0306] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0307] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: From the first side to the second side, it includes: A first lens having negative optical power, wherein the second side surface of the first lens is a concave surface; a second lens having positive optical power, wherein the first side surface of the second lens is a convex surface; a third lens having optical power, wherein the first side surface of the third lens is concave and the second side surface is convex; a fourth lens having negative optical power, wherein the second side surface of the fourth lens is a concave surface; a fifth lens having positive optical power, wherein the first side surface of the fifth lens is a convex surface; A sixth lens having optical power, wherein a first side surface of the sixth lens is a concave surface, and a second side surface of the sixth lens is a convex surface.

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

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

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

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

6. The optical lens according to claim 1, characterized in that: The third lens has positive refractive power.

7. The optical lens according to claim 1, characterized in that: The third lens has negative optical power.

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

9. An optical lens, characterized in that: From the first side to the second side, it includes: a first lens having negative optical power; a second lens having positive optical power; a third lens having optical power; a fourth lens having negative optical power; a fifth lens having positive refractive power; a sixth lens having optical power; The curvature radius R62 of the second side surface of the sixth lens satisfies the following relationship with the entire focal length F of the optical lens: R62 / F≤-0.

1.

10. An electronic device, characterized in that: The invention comprises the optical lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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