Optical lens and electronic device

Abstract

This invention provides an optical lens and an electronic device. The optical lens, from first to second side, includes: a first lens with positive optical power, wherein both its first and second sides are convex; a second lens with negative optical power, wherein both its first and second sides are convex; a third lens with positive optical power, wherein both its first and second sides are convex; a fourth lens with negative optical power, wherein its first side is concave; a fifth lens with positive optical power, wherein its second side is convex; a sixth lens with positive optical power, wherein its second side is convex; and a seventh lens with positive optical power, wherein its first side is convex. This invention solves the problem in existing optical lenses where miniaturization, high light throughput, low cost, low distortion, small aperture, large field of view, long back focal length, and high image quality are difficult to achieve simultaneously.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical lens and an electronic device. Background Technology

[0002] With the rapid development of automotive driver assistance systems, more and more cars are equipped with HUD systems. As the core component of HUD, the PGU (Power Photo Unit) places increasingly higher demands on its optical lenses. To achieve an inclined incident imaging surface, a coaxial solution is often used, tilting the imaging surface, but this leads to significant distortion. Alternatively, an off-axis solution can be used, which increases the FNO (Flight Noise) of the optical lens and reduces the light throughput. At the same time, the requirement for a large field of view leads to an increase in lens aperture, or the use of even-order aspherical lenses to reduce the aperture while improving image quality, but this increases costs.

[0003] While existing technologies offer some optical lenses, these lenses all suffer from common problems. For example, existing large FOV and wide field-of-view optical lenses face issues such as large aperture and high cost; existing optical lenses often employ a coaxial design, tilting the imaging plane, which leads to significant distortion; existing optical lenses cannot meet the requirements of small FNO, have weak light transmission capabilities, cannot provide higher light throughput under the same illumination source, have poor image quality, and are also difficult to achieve long back focal lengths.

[0004] In other words, existing optical lenses suffer from the problem of simultaneously achieving miniaturization, high light throughput, low cost, low distortion, small aperture, large field of view, long back focal length, and high image quality. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens and electronic device to solve the problem that existing optical lenses cannot simultaneously achieve miniaturization, high light throughput, low cost, low distortion, small aperture, large field of view, long back focal length, and high imaging quality.

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

[0007] Furthermore, the second side surface of the fourth lens is concave.

[0008] Furthermore, the second side surface of the fourth lens is convex.

[0009] Furthermore, the first side surface of the fifth lens is convex.

[0010] Furthermore, the first side surface of the fifth lens is concave.

[0011] Furthermore, the first side surface of the sixth lens is concave.

[0012] Furthermore, the first side surface of the sixth lens is convex.

[0013] Furthermore, the second side surface of the seventh lens is concave.

[0014] Furthermore, the second side surface of the seventh lens is convex.

[0015] Furthermore, the fourth lens and the fifth lens are cemented together to form a cemented doublet lens.

[0016] Furthermore, the optical lens also includes an aperture stop, which is positioned between the third lens and the fourth lens.

[0017] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian θ of the maximum field of view of the optical lens satisfy the following condition: 0.03≤|(HF*θ) / (F*θ)|≤0.2.

[0018] Furthermore, the maximum field of view (FOV) of the optical lens satisfies: 55.6°≤FOV≤100°.

[0019] Furthermore, the optical back focal length of the optical lens, i.e., the 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 length of the lens group of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens, satisfy the following condition: 0.13≤BFL / TL≤0.8.

[0020] Furthermore, the focal length F7 of the seventh lens satisfies the following relationship with the total focal length F of the optical lens: 1.6≤F7 / F≤5.3.

[0021] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: 2.2≤TTL / DMAX≤3.5.

[0022] Furthermore, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.06≤F / ENPD / D1≤0.15.

[0023] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following condition with respect to the total focal length F of the optical lens: 6.4≤TTL / F≤9.5.

[0024] Furthermore, the refractive index Nd1 of the material of the first lens satisfies: Nd1≥1.42.

[0025] Furthermore, the distance d6 between the second side of the third lens and the aperture stop satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane: d6 / TTL≥0.015.

[0026] Furthermore, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1≤F / ENPD≤4.

[0027] Furthermore, the radius of curvature R2 of the second side surface of the first lens satisfies the following relationship with the total focal length F of the optical lens: R2 / F≤0.

[0028] Furthermore, the sag5 of the first side of the third lens and the sag6 of the second side of the third lens satisfy the following condition: 0.4 ≤ |sag5 / sag6| ≤ 1.5.

[0029] Furthermore, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the following condition: 0.55≤|F6 / F7|≤1.7.

[0030] Furthermore, the radius of curvature R3 of the second side surface of the second lens and the radius of curvature R4 of the first side surface of the second lens satisfy the following condition: |R3 / R4|≥3.16.

[0031] Furthermore, the focal length F1 of the first lens satisfies the following relationship with the total focal length F of the optical lens: F1 / F≥3.5.

[0032] Furthermore, the focal length F2 of the second lens satisfies the following relationship with the total focal length F of the optical lens: -2≤F2 / F≤-0.05.

[0033] Furthermore, the focal length F3 of the third lens satisfies the following relationship with the total focal length F of the optical lens: 0.8 ≤ F3 / F ≤ 2.2.

[0034] Furthermore, the focal length F4 of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: -1.2≤F4 / F≤-0.4.

[0035] Furthermore, the focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 0.05≤F5 / F≤4.8.

[0036] Furthermore, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: 2.5≤F6 / F≤6.

[0037] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.03≤D / H / FOV≤0.8.

[0038] According to another aspect of the present invention, an optical lens is provided, comprising, from a first side to a second side, the following in sequence: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; a sixth lens having positive optical power; and a seventh lens having positive optical power; wherein the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: 2.2 ≤ TTL / DMAX ≤ 3.5.

[0039] Furthermore, the first side surface of the first lens is convex, and the second side surface is convex.

[0040] Furthermore, the first side surface of the second lens is convex, and the second side surface is concave.

[0041] Furthermore, the first side surface of the third lens is convex, and the second side surface is convex.

[0042] Furthermore, the first side surface of the fourth lens is concave, and the second side surface is concave.

[0043] Furthermore, the first side of the fourth lens is concave, and the second side is convex.

[0044] Furthermore, the first side surface of the fifth lens is convex, and the second side surface is convex.

[0045] Furthermore, the first side of the fifth lens is concave, and the second side is convex.

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

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

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

[0049] Furthermore, the first side surface of the seventh lens is convex, and the second side surface is convex.

[0050] Furthermore, the fourth lens and the fifth lens are cemented together to form a cemented doublet lens.

[0051] Furthermore, the optical lens also includes an aperture stop, which is positioned between the third lens and the fourth lens.

[0052] Furthermore, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian θ of the maximum field of view of the optical lens satisfy the following condition: 0.03≤|(HF*θ) / (F*θ)|≤0.2.

[0053] Furthermore, the maximum field of view (FOV) of the optical lens satisfies: 55.6°≤FOV≤100°.

[0054] Furthermore, the optical back focal length of the optical lens, i.e., the 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 length of the lens group of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens, satisfy the following condition: 0.13≤BFL / TL≤0.8.

[0055] Furthermore, the focal length F7 of the seventh lens satisfies the following relationship with the total focal length F of the optical lens: 1.6≤F7 / F≤5.3.

[0056] Furthermore, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D1 of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.06≤F / ENPD / D1≤0.15.

[0057] Furthermore, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following condition with respect to the total focal length F of the optical lens: 6.4≤TTL / F≤9.5.

[0058] Furthermore, the refractive index Nd1 of the material of the first lens satisfies: Nd1≥1.42.

[0059] Furthermore, the distance d6 between the second side of the third lens and the aperture stop satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane: d6 / TTL≥0.015.

[0060] Furthermore, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1≤F / ENPD≤4.

[0061] Furthermore, the radius of curvature R2 of the second side surface of the first lens satisfies the following relationship with the total focal length F of the optical lens: R2 / F≤0.

[0062] Furthermore, the sag5 of the first side of the third lens and the sag6 of the second side of the third lens satisfy the following condition: 0.4 ≤ |sag5 / sag6| ≤ 1.5.

[0063] Furthermore, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the following condition: 0.55≤|F6 / F7|≤1.7.

[0064] Furthermore, the radius of curvature R3 of the second side surface of the second lens and the radius of curvature R4 of the first side surface of the second lens satisfy the following condition: |R3 / R4|≥3.16.

[0065] Furthermore, the focal length F1 of the first lens satisfies the following relationship with the total focal length F of the optical lens: F1 / F≥3.5.

[0066] Furthermore, the focal length F2 of the second lens satisfies the following relationship with the total focal length F of the optical lens: -2≤F2 / F≤-0.05.

[0067] Furthermore, the focal length F3 of the third lens satisfies the following relationship with the total focal length F of the optical lens: 0.8 ≤ F3 / F ≤ 2.2.

[0068] Furthermore, the focal length F4 of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: -1.2≤F4 / F≤-0.4.

[0069] Furthermore, the focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 0.05≤F5 / F≤4.8.

[0070] Furthermore, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: 2.5≤F6 / F≤6.

[0071] Furthermore, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following condition: 0.03≤D / H / FOV≤0.8.

[0072] According to another aspect of the present invention, an electronic device is provided, including the aforementioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0073] According to the technical solution of this invention, the optical lens sequentially includes, from the first side to the second side: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, and a seventh lens with positive optical power. The first lens has a convex first side and a convex second side; the second lens has a convex first side and a concave second side; the third lens has a convex first side and a convex second side; the fourth lens has a concave first side; the fifth lens has a convex second side; the sixth lens has a convex second side; and the seventh lens has a convex first side.

[0074] The first lens has positive optical power, converging light rays. Simultaneously, the second side is convex, which helps to constrict the light rays at the front, reducing the height at which light enters the second lens and thus allowing for a smaller front aperture. The first lens is preferably made of a high-refractive-index material, which facilitates light refraction and achieves a wider field of view. It also allows for better control over the apertures of the front and rear lenses, enabling a miniaturized design.

[0075] The second lens has negative optical power, which further diverges the light, adjusts the light refraction angle, and reduces chromatic aberration. At the same time, the first side of the second lens is convex and the second side is concave, and the shape of the second lens is crescent-shaped, which is conducive to collecting light from a large field of view and increasing the light transmission of the optical lens. The concave second side makes the optical path of the edge field of view light different from that of the center field of view light when passing through the second lens. The optical path of the edge field of view light is longer, which is conducive to defocusing and correcting aberrations in the edge field of view, and improving resolving power.

[0076] The third lens has positive optical power, which converges light rays, adjusts the convergence center light rays and edge light rays, improves system illumination, and makes the light path transition smoothly to the rear, reducing system sensitivity. The second side of the third lens is convex, and the large-angle light rays at the edge field of view are deflected inward after passing through the third lens, which helps to reduce the aperture of the rear lens of the system, achieving miniaturization and reducing lens cost.

[0077] The fourth lens has negative optical power, causing the light rays passing through its center and edges to diverge, which helps to enlarge the aperture and improve system illumination. The first side of the fourth lens is concave, while the second side can be either convex or concave. When the second side of the fourth lens is concave, its biconcave shape, combined with the subsequent biconvex fifth lens with positive optical power, can correct chromatic aberration and reduce system sensitivity. The concave first side of the fourth lens rapidly increases the optical path difference between the edge and center fields of view, which helps to correct aberrations in the edge fields of view and improve image quality. When the second side of the fourth lens is convex, its shape becomes meniscus, which helps to collect light from a large field of view, increasing the light transmission of the optical lens. Furthermore, when cemented with the fifth lens, the light transition is smoother, further reducing lens sensitivity.

[0078] The fifth lens has positive optical power and converges light rays, effectively converging central and peripheral rays from various fields of view to increase system illumination. The second side of the fifth lens is convex, while the first side can be either convex or concave. When the first side of the fifth lens is convex, its shape is gentle, resulting in a smooth transition of light rays and less aberration, which helps improve the resolving power of the optical lens. When the first side of the fifth lens is concave and the second side is convex, it can be paired with a lens with negative optical power (the first side is concave and the second side is convex) to correct chromatic aberration. Furthermore, the crescent shape of the fifth lens helps collect light rays from a large field of view, increasing light transmission.

[0079] The sixth lens has positive optical power. Its second side is convex, while its first side can be either convex or concave. When the first side is concave, it has positive optical power and a meniscus shape, which helps to better collect light entering through the fifth lens, increasing the system's light transmission. When the first side is concave and the second side is convex, the light is incident on the sixth lens surface approximately perpendicularly, resulting in minimal light deflection across all fields of view, low energy loss, and a smooth light transition, which helps reduce lens sensitivity. When the sixth lens has positive optical power and its first side is convex, it can compress the angle of the incident light, achieving a smooth light transition and allowing diverging light to smoothly enter the rear, further smoothing the light path. This helps to reduce the aperture of the rear lens and lower system sensitivity.

[0080] The seventh lens has positive optical power and converges light rays, preventing energy loss caused by excessive angles between large field-of-view rays and the chip's principal ray when reaching the imaging surface, thus improving illumination at the edges of the field of view. The first side of the seventh lens is convex, while the second side can be either convex or concave. When the second side is concave, the positive optical power and gentle lens shape allow light to enter smoothly, resulting in a smooth transition in light path. This helps improve astigmatism and field curvature, enhancing the resolving power of the optical system. With a convex first side and a concave second side, light rays have a longer optical path to the imaging surface, facilitating a smaller CRA (Current Aspect Ratio). When the second side is convex, light rays tend to be perpendicular to the surface, resulting in a smooth transition, which helps reduce aberrations, improves resolving power, and also reduces lens sensitivity.

[0081] This application employs seven lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as miniaturization, high light throughput, low cost, low distortion, small aperture, large field of view, long back focal length, and high imaging quality. Attached Figure Description

[0082] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0083] Figure 1 A schematic diagram of the structure of an optical lens of Example 1 of the present invention is shown;

[0084] Figure 2 A schematic diagram of the structure of the optical lens of Example 2 of the present invention is shown;

[0085] Figure 3 A schematic diagram of the structure of the optical lens of Example 3 of the present invention is shown;

[0086] Figure 4 A schematic diagram of the structure of the optical lens of Example 4 of the present invention is shown;

[0087] Figure 5 A schematic diagram of the structure of the optical lens of Example 5 of the present invention is shown;

[0088] Figure 6 A schematic diagram of the structure of the optical lens of Example Six of the present invention is shown;

[0089] Figure 7 A schematic diagram of the structure of the optical lens of Example Seven of the present invention is shown;

[0090] Figure 8 A schematic diagram of the structure of the optical lens of Example 8 of the present invention is shown.

[0091] The above figures include the following reference numerals:

[0092] 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; L3, Third lens; S5, First side surface of the third lens; S6, Second side surface of the third lens; STO, Aperture stop; 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; L7, Seventh lens; S13, First side surface of the seventh lens; S14, Second side surface of the seventh lens; S15, First side surface of the protective glass; S16, Second side surface of the protective glass; IMA, Imaging plane. Detailed Implementation

[0093] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0094] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0095] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0096] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0097] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0098] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the first side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the second side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0099] 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.

[0100] In an exemplary embodiment, the optical lens provided in this application can be used as a vehicle-mounted lens. For a vehicle-mounted lens, the left side is the object side, and the right side is the image side; the first side is also the object side, and the second side is also the image side. Light rays from the object side can form an image on the image side.

[0101] When the optical lens of this 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 this application can be used as, for example, a projection lens or a lidar transmitting 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 rays 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.

[0102] To address the challenges of simultaneously achieving miniaturization, high light throughput, low cost, low distortion, small aperture, large field of view, long back focal length, and high image quality in existing optical lenses, this invention provides an optical lens and electronic device.

[0103] Example 1

[0104] like Figures 1 to 8As shown, the optical lens, from the first side to the second side, includes, in sequence: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, and a seventh lens with positive optical power. The first lens has a convex first side and a convex second side; the second lens has a convex first side and a concave second side; the third lens has a convex first side and a convex second side; the fourth lens has a concave first side; the fifth lens has a convex second side; the sixth lens has a convex second side; and the seventh lens has a convex first side.

[0105] The first lens has positive optical power, converging light rays. Simultaneously, the second side is convex, which helps to constrict the light rays at the front, reducing the height at which light enters the second lens and thus allowing for a smaller front aperture. The first lens is preferably made of a high-refractive-index material, which facilitates light refraction and achieves a wider field of view. It also allows for better control over the apertures of the front and rear lenses, enabling a miniaturized design.

[0106] The second lens has negative optical power, which further diverges the light, adjusts the light refraction angle, and reduces chromatic aberration. At the same time, the first side of the second lens is convex and the second side is concave, and the shape of the second lens is crescent-shaped, which is conducive to collecting light from a large field of view and increasing the light transmission of the optical lens. The concave second side makes the optical path of the edge field of view light different from that of the center field of view light when passing through the second lens. The optical path of the edge field of view light is longer, which is conducive to defocusing and correcting aberrations in the edge field of view, and improving resolving power.

[0107] The third lens has positive optical power, which converges light rays, adjusts the convergence center light rays and edge light rays, improves system illumination, and makes the light path transition smoothly to the rear, reducing system sensitivity. The second side of the third lens is convex, and the large-angle light rays at the edge field of view are deflected inward after passing through the third lens, which helps to reduce the aperture of the rear lens of the system, achieving miniaturization and reducing lens cost.

[0108] The fourth lens has negative optical power, causing the light rays passing through its center and edges to diverge, which helps to enlarge the aperture and improve system illumination. The first side of the fourth lens is concave, while the second side can be either convex or concave. When the second side of the fourth lens is concave, its biconcave shape, combined with the subsequent biconvex fifth lens with positive optical power, can correct chromatic aberration and reduce system sensitivity. The concave first side of the fourth lens rapidly increases the optical path difference between the edge and center fields of view, which helps to correct aberrations in the edge fields of view and improve image quality. When the second side of the fourth lens is convex, its shape becomes meniscus, which helps to collect light from a large field of view, increasing the light transmission of the optical lens. Furthermore, when cemented with the fifth lens, the light transition is smoother, further reducing lens sensitivity.

[0109] The fifth lens has positive optical power and converges light rays, effectively converging central and peripheral rays from various fields of view to increase system illumination. The second side of the fifth lens is convex, while the first side can be either convex or concave. When the first side of the fifth lens is convex, its shape is gentle, resulting in a smooth transition of light rays and less aberration, which helps improve the resolving power of the optical lens. When the first side of the fifth lens is concave and the second side is convex, it can be paired with a lens with negative optical power (the first side is concave and the second side is convex) to correct chromatic aberration. Furthermore, the crescent shape of the fifth lens helps collect light rays from a large field of view, increasing light transmission.

[0110] The sixth lens has positive optical power. Its second side is convex, while its first side can be either convex or concave. When the first side is concave, it has positive optical power and a meniscus shape, which helps to better collect light entering through the fifth lens, increasing the system's light transmission. When the first side is concave and the second side is convex, the light is incident on the sixth lens surface approximately perpendicularly, resulting in minimal light deflection across all fields of view, low energy loss, and a smooth light transition, which helps reduce lens sensitivity. When the sixth lens has positive optical power and its first side is convex, it can compress the angle of the incident light, achieving a smooth light transition and allowing diverging light to smoothly enter the rear, further smoothing the light path. This helps to reduce the aperture of the rear lens and lower system sensitivity.

[0111] The seventh lens has positive optical power and converges light rays, preventing energy loss caused by excessive angles between large field-of-view rays and the chip's principal ray when reaching the imaging surface, thus improving illumination at the edges of the field of view. The first side of the seventh lens is convex, while the second side can be either convex or concave. When the second side is concave, the positive optical power and gentle lens shape allow light to enter smoothly, resulting in a smooth transition in light path. This helps improve astigmatism and field curvature, enhancing the resolving power of the optical system. With a convex first side and a concave second side, light rays have a longer optical path to the imaging surface, facilitating a smaller CRA (Current Aspect Ratio). When the second side is convex, light rays tend to be perpendicular to the surface, resulting in a smooth transition, which helps reduce aberrations, improves resolving power, and also reduces lens sensitivity.

[0112] This application employs seven lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as miniaturization, high light throughput, low cost, low distortion, small aperture, large field of view, long back focal length, and high imaging quality.

[0113] In this embodiment, the second side of the fourth lens is concave. The biconcave shape of the fourth lens, when paired with the subsequent biconvex fifth lens with positive optical power, can correct chromatic aberration and reduce system sensitivity. The first side of the fourth lens is concave, which rapidly increases the optical path difference between the edge and center fields of view, which is beneficial for correcting aberrations in the edge fields of view and improving image quality.

[0114] In this embodiment, the second side surface of the fourth lens is convex. This makes the fourth lens crescent-shaped, which is beneficial for collecting light from a large field of view and increasing the light transmission of the optical lens. At the same time, after being cemented with the fifth lens, the light transition is smoother, which helps to reduce lens sensitivity.

[0115] In this embodiment, the first side surface of the fifth lens is convex. The fifth lens has a gentle shape, so when light passes through it, the light transition is smooth, resulting in less aberration and improving the resolving power of the optical lens.

[0116] In this embodiment, the first side surface of the fifth lens is concave. When the first side surface of the fifth lens is concave and the second side surface is convex, it can correct chromatic aberration when paired with a lens that has a negative optical power, where the first side surface is concave and the second side surface is convex. At the same time, the shape of the fifth lens is crescent-shaped, which is beneficial for collecting light from a large field of view and increasing the amount of light transmitted.

[0117] In this embodiment, the first side of the sixth lens is concave. Its positive optical power and crescent shape facilitate better collection of light entering through the fifth lens, increasing the system's light transmittance. The concave first side and convex second side of the sixth lens ensure that light rays are incident on the sixth lens surface approximately perpendicularly, resulting in minimal light deflection across different fields of view, low energy loss, and smooth light transition, which helps reduce the lens's sensitivity.

[0118] In this embodiment, the sixth lens has positive optical power and its first side surface is convex, which can compress the angle of the incident light to achieve a smooth transition of the light, allowing the diverging light to smoothly enter the rear, further making the light path transition smoothly, which is beneficial to reducing the aperture of the rear lens and reducing the system sensitivity.

[0119] In this embodiment, the second side of the seventh lens is concave. The positive optical power and the gently sloping lens shape allow light to enter smoothly and transition smoothly, which helps improve astigmatism and field curvature, and enhances the resolving power of the optical system. The first side of the seventh lens is convex, and the second side is concave, allowing light to travel a longer optical path to the imaging surface, which is beneficial for achieving a small CRA (Current Aspect Ratio).

[0120] In this embodiment, the second side surface of the seventh lens is convex. This makes the light entering this surface tend to be perpendicular, so the light entering this surface has a smooth transition, which helps to reduce aberrations, improve resolution, and at the same time helps to reduce lens sensitivity.

[0121] In this embodiment, the fourth and fifth lenses are cemented together to form a cemented doublet lens. The use of a cemented doublet lens effectively eliminates the influence of ghosting on the optical lens and corrects chromatic aberration, ensuring high resolution while eliminating ghosting. The fourth lens, with its negative optical power, works in conjunction with the subsequent positive optical power fifth lens to correct chromatic aberration. The negative lens in the cemented doublet has a higher refractive index (relative to the positive lens), allowing light to converge effectively and smoothly at the final point, ensuring a stable light path to the imaging plane and reducing overall weight and cost. Simultaneously, the cemented doublet reduces light loss caused by inter-lens reflections. The combination of high and low refractive indices facilitates rapid transition of light from the front, increases the aperture, and enhances light transmission, which is beneficial for night vision requirements. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, making the optical system more compact and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0122] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the third lens and the fourth lens. By placing the aperture stop between the third lens and the fourth lens, the aperture stop is positioned in the middle, which helps to effectively gather the light entering the optical system, reduce the lens apertures at both ends of the optical system, adjust the telecentricity of the optical lens, and reduce the assembly sensitivity of the system.

[0123] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian θ of the maximum field of view of the optical lens satisfy the following condition: 0.03 ≤ |(HF*θ) / (F*θ)| ≤ 0.2. Satisfying this condition ensures that, while keeping the field of view and image plane size constant, reducing the focal length of the optical lens can achieve small distortion, reduce the degree of image distortion, and ensure undistorted imaging. Preferably, 0.05 ≤ |(HF*θ) / (F*θ)| ≤ 0.14.

[0124] In this embodiment, the maximum field of view (FOV) of the optical lens satisfies: 55.6° ≤ FOV ≤ 100°. Constraining the maximum field of view within this range helps to ensure the large FOV characteristic. Preferably, 57° ≤ FOV ≤ 62°. FOV is associated with H, representing the field of view corresponding to the image height.

[0125] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens to the center of the imaging plane, is proportional to the length of the lens group (TL), i.e., the distance from the center of the first side of the first lens to the center of the second side of the last lens, satisfies the following ratio: 0.13 ≤ BFL / TL ≤ 0.8. Reasonably controlling the ratio of the optical back focal length to the length of the lens group within a certain range can meet the special requirements of the optical lens's back focal length, reserve space for optical element installation and focusing, avoid interference between mechanisms, and also help reduce the energy of ghost images generated by reflections between the lens and the protective glass. Preferably, 0.25 ≤ BFL / TL ≤ 0.6.

[0126] In this embodiment, the focal length F7 of the seventh lens satisfies the following relationship with the total focal length F of the optical lens: 1.6 ≤ F7 / F ≤ 5.3. Satisfying this condition facilitates the rational allocation of the focal length of the seventh lens, ensuring that the last lens, i.e., the seventh lens, has a short focal length, which is beneficial for light deflection and thus helps in light collection, ensuring the system's light transmission. Preferably, 2.5 ≤ F7 / F ≤ 4.2.

[0127] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: 2.2 ≤ TTL / DMAX ≤ 3.5. If TTL / DMAX is too large, the overall size of the optical lens system will be large. Setting TTL / DMAX within a certain range can facilitate miniaturization, making the entire optical system more compact and smaller, which is beneficial for achieving ultra-thin design. Preferably, 2.5 ≤ TTL / DMAX ≤ 3.2.

[0128] In this embodiment, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D1 of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.06 ≤ F / ENPD / D1 ≤ 0.15. Satisfying this condition ensures a small aperture while maintaining high light transmission, thus achieving miniaturization. Preferably, 0.08 ≤ F / ENPD / D1 ≤ 0.13.

[0129] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following relationship with the total focal length F of the optical lens: 6.4 ≤ TTL / F ≤ 9.5. If TTL / F is too large, the system sensitivity will be high; a shorter TTL is beneficial for resolution and system sensitivity. Setting TTL / F within a certain range is beneficial for miniaturization, system resolution, and sensitivity. Preferably, 6.8 ≤ TTL / F ≤ 8.

[0130] In this embodiment, the refractive index Nd1 of the first lens material satisfies: Nd1≥1.42. Using a high refractive index material for the first lens is beneficial for refracting light rays and achieving a larger field of view. It also helps to control the aperture of the front and rear lenses, enabling miniaturized design. Preferably, Nd1≥1.55.

[0131] In this embodiment, the distance d6 between the second side surface of the third lens and the aperture stop satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane: d6 / TTL ≥ 0.015. By appropriately setting the distance between the second side surface of the third lens and the aperture stop, a smooth transition of light near the aperture stop is facilitated, which is beneficial for improving image quality. Preferably, d6 / TTL ≥ 0.024.

[0132] In this embodiment, the focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the condition: 1 ≤ F / ENPD ≤ 4. Satisfying this condition helps to ensure a small FNO, increases luminous flux, ensures a large entrance pupil diameter, and improves relative illumination. Preferably, 1.5 ≤ F / ENPD ≤ 3.5.

[0133] In this embodiment, the radius of curvature R2 of the second side surface of the first lens satisfies the condition R2 / F ≤ 0 with respect to the overall focal length F of the optical lens. The second side surface of the first lens is convex, which helps to constrict the light rays at the front end, reducing the height of the light entering the second lens and thus decreasing the front aperture. Preferably, R2 / F ≤ -10.

[0134] In this embodiment, the sagitta of the first side surface of the third lens, sag5, and the sagitta of the second side surface of the third lens, sag6, satisfy the condition: 0.4 ≤ |sag5 / sag6| ≤ 1.5. By reasonably setting the sagitta of the front and rear surfaces of the third lens to be close to each other, it is beneficial to smooth light transition and reduce the sensitivity of the third lens. Preferably, 0.5 ≤ |sag5 / sag6| ≤ 1.3.

[0135] In this embodiment, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the condition: 0.55 ≤ |F6 / F7| ≤ 1.7. Satisfying this condition facilitates a smooth transition of light between adjacent lenses, allowing diverging light rays to enter the rear more easily, reducing system sensitivity. Simultaneously, the light rays are incident almost perpendicularly on the lens surface, which helps reduce aberrations and improve resolution. Preferably, 0.7 ≤ |F6 / F7| ≤ 1.5.

[0136] In this embodiment, the radius of curvature R3 of the second side surface of the second lens and the radius of curvature R4 of the first side surface of the second lens satisfy the condition: |R3 / R4|≥3.16. Satisfying this condition results in a large difference in the radii of curvature between the two surfaces of the second lens. This leads to different optical path lengths for light rays from the edge and center fields of view when passing through the second lens, with a longer optical path in the edge field. This is beneficial for defocusing and correcting aberrations in the edge field of view, improving resolution. Simultaneously, the meniscus shape of the second lens facilitates the collection of light rays from a large field of view, increasing the light transmission of the optical lens. Preferably, |R3 / R4|≥3.8.

[0137] In this embodiment, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy the condition: F1 / F ≥ 3.5. By rationally allocating the focal length of the first lens, it is beneficial for light rays with a large field of view to enter the optical system, thereby improving the system's resolving power. Preferably, F1 / F ≥ 5.2.

[0138] In this embodiment, the focal length F2 of the second lens satisfies the following relationship with the total focal length F of the optical lens: -2 ≤ F2 / F ≤ -0.05. By rationally allocating the focal length of the second lens, light collection is improved, ensuring sufficient light transmission and enhancing resolution. Preferably, -1.5 ≤ F2 / F ≤ -1.

[0139] In this embodiment, the focal length F3 of the third lens satisfies the following relationship with the total focal length F of the optical lens: 0.8 ≤ F3 / F ≤ 2.2. Properly allocating the focal length of the third lens helps to converge light, adjust the light rays at the convergence center and edge positions, improve system illumination, and simultaneously ensure a smooth transition of light rays to the rear, reducing system sensitivity. Preferably, 1 ≤ F3 / F ≤ 1.9.

[0140] In this embodiment, the focal length F4 of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: -1.2 ≤ F4 / F ≤ -0.4. By rationally allocating the focal length of the fourth lens, it is beneficial to correct aberrations in each field of view and improve image quality. Preferably, -1 ≤ F4 / F ≤ -0.6.

[0141] In this embodiment, the focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 0.05 ≤ F5 / F ≤ 4.8. By rationally allocating the focal length of the fifth lens, the focal length of the lens remains stable over a wide temperature range, exhibiting excellent temperature performance and ensuring stable performance of the optical lens when temperature changes. Preferably, 0.8 ≤ F5 / F ≤ 2.95.

[0142] In this embodiment, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: 2.5 ≤ F6 / F ≤ 6. By rationally allocating the focal length of the sixth lens, light can be quickly focused onto the imaging plane, avoiding upward beams; the convergence of light rays is beneficial for achieving a small CRA (Collateral Radiation). Preferably, 3 ≤ F6 / F ≤ 4.6.

[0143] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: 0.03 ≤ D / H / FOV ≤ 0.8. Satisfying this condition helps to ensure a small front aperture, enabling miniaturization. Preferably, 0.1 ≤ D / H / FOV ≤ 0.5.

[0144] Example 2

[0145] like Figures 1 to 8 As shown, the optical lens, from the first side to the second side, sequentially includes: a first lens with positive optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with negative optical power; a fifth lens with positive optical power; a sixth lens with positive optical power; and a seventh lens with positive optical power. The total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following condition with respect to the maximum aperture DMAX of the optical lens: 2.2 ≤ TTL / DMAX ≤ 3.5. If TTL / DMAX is too large, the overall size of the optical lens system will be large. Setting TTL / DMAX within a certain range can facilitate miniaturization, making the entire optical system more compact and smaller, which is beneficial for achieving ultra-thin designs. Preferably, 2.5 ≤ TTL / DMAX ≤ 3.2.

[0146] In this embodiment, the first side surface of the first lens is convex, and the second side surface is also convex. The first lens has positive optical power, which converges light rays. Simultaneously, the convex nature of the second side surface helps to constrict the light rays at the front end, reducing the height at which light enters the second lens and thus reducing the front aperture. The first lens preferably uses a high refractive index material, which facilitates light refraction and achieves a wider field of view. It also allows for better control of the apertures of the front and rear lenses, enabling a miniaturized design.

[0147] In this embodiment, the first side of the second lens is convex, and the second side is concave. The second lens has negative optical power, which further diverges the light, adjusts the light refraction angle, and reduces chromatic aberration. At the same time, the first side of the second lens is convex, and the second side is concave, giving the second lens a crescent shape, which is beneficial for collecting light from a large field of view and increasing the light transmission of the optical lens. The concave second side causes the optical path of the edge field of view light to be different from that of the center field of view light when passing through the second lens. The optical path of the edge field of view light is longer, which is beneficial for defocusing and correcting aberrations in the edge field of view, thereby improving resolving power.

[0148] In this embodiment, the first side surface of the third lens is convex, and the second side surface is convex. The third lens has positive optical power, which converges light rays, adjusts the convergence center light rays and edge position light rays, improves system illumination, and at the same time makes the light path smoothly transition to the rear, reducing system sensitivity; the second side surface of the third lens is convex, and the large-angle light rays at the edge field of view are deflected inward after passing through the third lens, which helps to reduce the aperture of the rear lens of the system, achieving miniaturization and reducing lens cost.

[0149] In this embodiment, the first and second sides of the fourth lens are concave. The fourth lens has negative optical power, causing the light rays passing through the center and edges of the fourth lens to diverge, which helps to enlarge the aperture and improve the system illumination. The biconcave shape of the fourth lens, combined with the subsequent biconvex fifth lens with positive optical power, can correct chromatic aberration and reduce system sensitivity. The concave first side of the fourth lens rapidly increases the optical path difference between the edge and center fields of view, which helps to correct aberrations in the edge fields of view and improve image quality.

[0150] In this embodiment, the first side of the fourth lens is concave, and the second side is convex. The fourth lens has negative optical power, causing the light rays passing through the center and edges of the fourth lens to diverge, which is beneficial for increasing the aperture and improving the system illumination. The concave first side and convex second side of the fourth lens make the shape of the fourth lens crescent-shaped, which is beneficial for collecting light from a large field of view and increasing the light transmission of the optical lens. At the same time, after being cemented with the fifth lens, the light transition is smoother, which helps to reduce lens sensitivity.

[0151] In this embodiment, the first side surface of the fifth lens is convex, and the second side surface is convex. The fifth lens has positive optical power and converges light rays, effectively converging the central and peripheral rays from each field of view to increase the system illumination. The shape of the fifth lens is gentle, so the light transitions smoothly when passing through it, resulting in less aberration and improving the resolving power of the optical lens.

[0152] In this embodiment, the first side of the fifth lens is concave, and the second side is convex. The fifth lens has positive optical power and converges light, effectively converging the central and peripheral rays from each field of view, thus increasing the system illumination. When the first side of the fifth lens is concave and the second side is convex, it can be paired with a lens that has negative optical power and a concave first side and a convex second side to correct chromatic aberration. Furthermore, the crescent shape of the fifth lens facilitates the collection of light from a large field of view, increasing the light transmission.

[0153] In this embodiment, the first side of the sixth lens is concave, and the second side is convex. Its positive optical power and crescent shape facilitate better collection of light entering through the fifth lens, increasing the system's light transmittance. The concave first side and convex second side of the sixth lens ensure that light rays are incident on the sixth lens surface approximately perpendicularly, resulting in minimal light deflection across different fields of view, low energy loss, and a smooth light transition, which helps reduce the lens's sensitivity.

[0154] In this embodiment, the first side surface of the sixth lens is convex, and the second side surface is convex. The sixth lens has positive optical power, and its first side surface is convex, which can compress the angle of the incident light to achieve a smooth transition of light, allowing the diverging light to smoothly enter the rear, further smoothing the light path transition, which is beneficial to reducing the aperture of the rear lens and reducing system sensitivity.

[0155] In this embodiment, the first side of the seventh lens is convex, and the second side is concave. The seventh lens has positive optical power, which converges light rays, avoiding light energy loss caused by excessive angle between the large field of view light rays and the chip's principal ray when they reach the imaging surface, thus improving the illumination of the edge field of view; the positive optical power and the gently sloping lens shape allow light rays to enter smoothly and transition smoothly, which helps to improve astigmatism and field curvature in imaging, and improves the resolving power of the optical system; the first side of the seventh lens is convex, and the second side is concave, so that light rays have a longer optical path when they reach the imaging surface after passing through the seventh lens, which is beneficial for achieving small CRA.

[0156] In this embodiment, the first side surface of the seventh lens is convex, and the second side surface is convex. The seventh lens has positive optical power and converges light rays, avoiding light energy loss caused by excessive angle between the large field of view light rays and the chip's principal ray when they reach the imaging surface, thus improving the illumination of the edge field of view. When the second side surface of the seventh lens is convex, light rays tend to be perpendicularly incident upon entering this surface, resulting in a smooth transition of light rays entering this surface. This helps reduce aberrations, improve resolution, and also helps reduce lens sensitivity.

[0157] This application employs seven lenses. By optimizing the optical power and surface shape of each lens, the optical lens of this invention has at least one beneficial effect, such as miniaturization, high light throughput, low cost, low distortion, small aperture, large field of view, long back focal length, and high imaging quality.

[0158] In this embodiment, the fourth and fifth lenses are cemented together to form a cemented doublet lens. The use of a cemented doublet lens effectively eliminates the influence of ghosting on the optical lens and corrects chromatic aberration, ensuring high resolution while eliminating ghosting. The fourth lens, with its negative optical power, works in conjunction with the subsequent positive optical power fifth lens to correct chromatic aberration. The negative lens in the cemented doublet has a higher refractive index (relative to the positive lens), allowing light to converge effectively and smoothly at the final point, ensuring a stable light path to the imaging plane and reducing overall weight and cost. Simultaneously, the cemented doublet reduces light loss caused by inter-lens reflections. The combination of high and low refractive indices facilitates rapid transition of light from the front, increases the aperture, and enhances light transmission, which is beneficial for night vision requirements. Furthermore, the use of a cemented doublet reduces the air gap between the two lenses, making the optical system more compact and reducing tolerance sensitivity issues such as overall eccentricity of the lens units during assembly.

[0159] In this embodiment, the optical lens also includes an aperture stop, which is disposed between the third lens and the fourth lens. By placing the aperture stop between the third lens and the fourth lens, the aperture stop is positioned in the middle, which helps to effectively gather the light entering the optical system, reduce the lens apertures at both ends of the optical system, adjust the telecentricity of the optical lens, and reduce the assembly sensitivity of the system.

[0160] In this embodiment, the image height H corresponding to the maximum field of view of the optical lens, the total focal length F of the optical lens, and the radian θ of the maximum field of view of the optical lens satisfy the following condition: 0.03 ≤ |(HF*θ) / (F*θ)| ≤ 0.2. Satisfying this condition ensures that, while keeping the field of view and image plane size constant, reducing the focal length of the optical lens can achieve small distortion, reduce the degree of image distortion, and ensure undistorted imaging. Preferably, 0.05 ≤ |(HF*θ) / (F*θ)| ≤ 0.14.

[0161] In this embodiment, the maximum field of view (FOV) of the optical lens satisfies: 55.6° ≤ FOV ≤ 100°. Constraining the maximum field of view within this range helps to ensure the large FOV characteristic. Preferably, 57° ≤ FOV ≤ 62°. FOV is associated with H, representing the field of view corresponding to the image height.

[0162] In this embodiment, the optical back focal length (BFL), i.e., the distance from the center of the second side of the last lens to the center of the imaging plane, is proportional to the length of the lens group (TL), i.e., the distance from the center of the first side of the first lens to the center of the second side of the last lens, satisfies the following ratio: 0.13 ≤ BFL / TL ≤ 0.8. Reasonably controlling the ratio of the optical back focal length to the length of the lens group within a certain range can meet the special requirements of the optical lens's back focal length, reserve space for optical element installation and focusing, avoid interference between mechanisms, and also help reduce the energy of ghost images generated by reflections between the lens and the protective glass. Preferably, 0.25 ≤ BFL / TL ≤ 0.6.

[0163] In this embodiment, the focal length F7 of the seventh lens satisfies the following relationship with the total focal length F of the optical lens: 1.6 ≤ F7 / F ≤ 5.3. Satisfying this condition facilitates the rational allocation of the focal length of the seventh lens, ensuring that the last lens, i.e., the seventh lens, has a short focal length, which is beneficial for light deflection and thus helps in light collection, ensuring the system's light transmission. Preferably, 2.5 ≤ F7 / F ≤ 4.2.

[0164] In this embodiment, the overall focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D1 of the first side surface of the first lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.06 ≤ F / ENPD / D1 ≤ 0.15. Satisfying this condition ensures a small aperture while maintaining high light transmission, thus achieving miniaturization. Preferably, 0.08 ≤ F / ENPD / D1 ≤ 0.13.

[0165] In this embodiment, the total optical length of the optical lens, i.e., the distance TTL from the center of the first side of the first lens to the center of the imaging plane, satisfies the following relationship with the total focal length F of the optical lens: 6.4 ≤ TTL / F ≤ 9.5. If TTL / F is too large, the system sensitivity will be high; a shorter TTL is beneficial for resolution and system sensitivity. Setting TTL / F within a certain range is beneficial for miniaturization, system resolution, and sensitivity. Preferably, 6.8 ≤ TTL / F ≤ 8.

[0166] In this embodiment, the refractive index Nd1 of the first lens material satisfies: Nd1≥1.42. Using a high refractive index material for the first lens is beneficial for refracting light rays and achieving a larger field of view. It also helps to control the aperture of the front and rear lenses, enabling miniaturized design. Preferably, Nd1≥1.55.

[0167] In this embodiment, the distance d6 between the second side surface of the third lens and the aperture stop satisfies the following condition with respect to the total optical length of the optical lens, i.e., the distance TTL from the center of the first side surface of the first lens to the center of the imaging plane: d6 / TTL ≥ 0.015. By appropriately setting the distance between the second side surface of the third lens and the aperture stop, a smooth transition of light near the aperture stop is facilitated, which is beneficial for improving image quality. Preferably, d6 / TTL ≥ 0.024.

[0168] In this embodiment, the focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the condition: 1 ≤ F / ENPD ≤ 4. Satisfying this condition helps to ensure a small FNO, increases luminous flux, ensures a large entrance pupil diameter, and improves relative illumination. Preferably, 1.5 ≤ F / ENPD ≤ 3.5.

[0169] In this embodiment, the radius of curvature R2 of the second side surface of the first lens satisfies the condition R2 / F ≤ 0 with respect to the overall focal length F of the optical lens. The second side surface of the first lens is convex, which helps to constrict the light rays at the front end, reducing the height of the light entering the second lens and thus decreasing the front aperture. Preferably, R2 / F ≤ -10.

[0170] In this embodiment, the sagitta of the first side surface of the third lens, sag5, and the sagitta of the second side surface of the third lens, sag6, satisfy the condition: 0.4 ≤ |sag5 / sag6| ≤ 1.5. By reasonably setting the sagitta of the front and rear surfaces of the third lens to be close to each other, it is beneficial to smooth light transition and reduce the sensitivity of the third lens. Preferably, 0.5 ≤ |sag5 / sag6| ≤ 1.3.

[0171] In this embodiment, the focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy the condition: 0.55 ≤ |F6 / F7| ≤ 1.7. Satisfying this condition facilitates a smooth transition of light between adjacent lenses, allowing diverging light rays to enter the rear more easily, reducing system sensitivity. Simultaneously, the light rays are incident almost perpendicularly on the lens surface, which helps reduce aberrations and improve resolution. Preferably, 0.7 ≤ |F6 / F7| ≤ 1.5.

[0172] In this embodiment, the radius of curvature R3 of the second side surface of the second lens and the radius of curvature R4 of the first side surface of the second lens satisfy the condition: |R3 / R4|≥3.16. Satisfying this condition results in a large difference in the radii of curvature between the two surfaces of the second lens. This leads to different optical path lengths for light rays from the edge and center fields of view when passing through the second lens, with a longer optical path in the edge field. This is beneficial for defocusing and correcting aberrations in the edge field of view, improving resolution. Simultaneously, the meniscus shape of the second lens facilitates the collection of light rays from a large field of view, increasing the light transmission of the optical lens. Preferably, |R3 / R4|≥3.8.

[0173] In this embodiment, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy the condition: F1 / F ≥ 3.5. By rationally allocating the focal length of the first lens, it is beneficial for light rays with a large field of view to enter the optical system, thereby improving the system's resolving power. Preferably, F1 / F ≥ 5.2.

[0174] In this embodiment, the focal length F2 of the second lens satisfies the following relationship with the total focal length F of the optical lens: -2 ≤ F2 / F ≤ -0.05. By rationally allocating the focal length of the second lens, light collection is improved, ensuring sufficient light transmission and enhancing resolution. Preferably, -1.5 ≤ F2 / F ≤ -1.

[0175] In this embodiment, the focal length F3 of the third lens satisfies the following relationship with the total focal length F of the optical lens: 0.8 ≤ F3 / F ≤ 2.2. Properly allocating the focal length of the third lens helps to converge light, adjust the light rays at the convergence center and edge positions, improve system illumination, and simultaneously ensure a smooth transition of light rays to the rear, reducing system sensitivity. Preferably, 1 ≤ F3 / F ≤ 1.9.

[0176] In this embodiment, the focal length F4 of the fourth lens satisfies the following relationship with the total focal length F of the optical lens: -1.2 ≤ F4 / F ≤ -0.4. By rationally allocating the focal length of the fourth lens, it is beneficial to correct aberrations in each field of view and improve image quality. Preferably, -1 ≤ F4 / F ≤ -0.6.

[0177] In this embodiment, the focal length F5 of the fifth lens satisfies the following relationship with the total focal length F of the optical lens: 0.05 ≤ F5 / F ≤ 4.8. By rationally allocating the focal length of the fifth lens, the focal length of the lens remains stable over a wide temperature range, exhibiting excellent temperature performance and ensuring stable performance of the optical lens when temperature changes. Preferably, 0.8 ≤ F5 / F ≤ 2.95.

[0178] In this embodiment, the focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the optical lens: 2.5 ≤ F6 / F ≤ 6. By rationally allocating the focal length of the sixth lens, light can be quickly focused onto the imaging plane, avoiding upward beams; the convergence of light rays is beneficial for achieving a small CRA (Collateral Radiation). Preferably, 3 ≤ F6 / F ≤ 4.6.

[0179] In this embodiment, the maximum aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view (FOV) of the optical lens satisfy the following condition: 0.03 ≤ D / H / FOV ≤ 0.8. Satisfying this condition helps to ensure a small front aperture, enabling miniaturization. Preferably, 0.1 ≤ D / H / FOV ≤ 0.5.

[0180] Optionally, the aforementioned optical lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0181] The optical lens in this application may employ multiple lenses, such as the seven lenses mentioned above. This application does not specifically limit the number of spherical and aspherical lenses; when image quality is a primary concern, the number of aspherical lenses can be increased. The characteristic of an aspherical lens is that its curvature changes continuously from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0182] In this exemplary embodiment, the solution is not limited to plastic or glass for the lenses. If temperature performance is a primary concern, the first, second, third, fourth, fifth, sixth, and seventh lenses can all be glass lenses. Optical lenses made of glass can suppress the shift in the back focus of the optical lens due to temperature changes, thereby improving system stability. Simultaneously, using glass avoids lens blurring caused by high and low temperature variations in the operating environment, thus preventing the normal use of the optical lens. For example, an all-glass optical lens has a wider temperature range, maintaining stable optical performance within the range of -40℃ to 105℃. Specifically, when resolution and reliability are of primary concern, the first to seventh lenses can all be aspherical glass lenses. Of course, in applications where temperature stability requirements are lower, the first to seventh lenses in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce manufacturing costs. Alternatively, the first to seventh lenses in the optical lens can also be made of a combination of plastic and glass.

[0183] This application also provides an electronic device, including the aforementioned optical lens and an imaging element that converts the optical image formed by the optical lens into an electrical signal. The imaging element may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The electronic device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This electronic device is equipped with the optical lens described above.

[0184] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although seven lenses are described as an example in the embodiments, the optical lens is not limited to including seven lenses. If necessary, the optical lens may also include other numbers of lenses.

[0185] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lenses applicable to the above embodiments.

[0186] It should be noted that any of the examples one through eight below are applicable to all embodiments of this application.

[0187] Example 1

[0188] like Figure 1 The diagram shown is a schematic of the optical lens structure of Example 1.

[0189] like Figure 1 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0190] The first lens L1 has positive optical power, and its first side surface S1 and second side surface S2 are convex. The second lens L2 has negative optical power, and its first side surface S3 and second side surface S4 are concave. The third lens L3 has positive optical power, and its first side surface S5 and second side surface S6 are convex. The fourth lens L4 has negative optical power, and its first side surface S8 and second side surface S9 are concave. The fifth lens L5 has positive optical power, and its first side surface S9 and second side surface S10 are convex. The sixth lens L6 has positive optical power, and its first side surface S11 and second side surface S12 are concave. The seventh lens L7 has positive optical power, and its first side surface S13 and second side surface S14 are convex. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0191] In this example, the total effective focal length F of the optical lens is 10.025mm, the maximum field of view (FOV) of the optical lens is 59.110°, and the total length (TTL) of the optical lens is 70.784mm.

[0192] Table 1 shows the basic structural parameters of the optical lens in Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0193]

[0194]

[0195] Table 1

[0196] In Example 1, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0197] Example 2

[0198] like Figure 2 The diagram shown is a schematic of the optical lens structure for Example 2. For the sake of brevity, descriptions similar to those in Example 1 will be omitted in this example and the following examples.

[0199] like Figure 2 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0200] The first lens L1 has positive optical power, and its first side surface S1 and second side surface S2 are convex. The second lens L2 has negative optical power, and its first side surface S3 and second side surface S4 are concave. The third lens L3 has positive optical power, and its first side surface S5 and second side surface S6 are convex. The fourth lens L4 has negative optical power, and its first side surface S8 and second side surface S9 are concave. The fifth lens L5 has positive optical power, and its first side surface S9 and second side surface S10 are convex. The sixth lens L6 has positive optical power, and its first side surface S11 and second side surface S12 are concave. The seventh lens L7 has positive optical power, and its first side surface S13 and second side surface S14 are convex. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0201] In this example, the total effective focal length F of the optical lens is 10.031mm, the maximum field of view (FOV) of the optical lens is 58.705°, and the total length (TTL) of the optical lens is 71.374mm.

[0202] Table 2 shows the basic structural parameters of the optical lens in Example 2, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0203]

[0204]

[0205] Table 2

[0206] In Example 2, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0207] Example 3

[0208] like Figure 3 The diagram shown is a schematic of the optical lens structure in Example 3.

[0209] like Figure 3 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0210] The first lens L1 has positive optical power, and its first side surface S1 and second side surface S2 are convex. The second lens L2 has negative optical power, and its first side surface S3 and second side surface S4 are concave. The third lens L3 has positive optical power, and its first side surface S5 and second side surface S6 are convex. The fourth lens L4 has negative optical power, and its first side surface S8 and second side surface S9 are concave. The fifth lens L5 has positive optical power, and its first side surface S9 and second side surface S10 are convex. The sixth lens L6 has positive optical power, and its first side surface S11 and second side surface S12 are convex. The seventh lens L7 has positive optical power, and its first side surface S13 and second side surface S14 are convex. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0211] In this example, the total effective focal length F of the optical lens is 10.046mm, the maximum field of view (FOV) of the optical lens is 59.250°, and the total length (TTL) of the optical lens is 73.736mm.

[0212] Table 3 shows the basic structural parameters of the optical lens in Example 3, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0213]

[0214]

[0215] Table 3

[0216] In Example 3, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0217] Example 4

[0218] like Figure 4 The diagram shown is a schematic of the optical lens structure of Example 4.

[0219] like Figure 4 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0220] The first lens L1 has positive optical power, and its first side surface S1 and second side surface S2 are convex. The second lens L2 has negative optical power, and its first side surface S3 and second side surface S4 are concave. The third lens L3 has positive optical power, and its first side surface S5 and second side surface S6 are convex. The fourth lens L4 has negative optical power, and its first side surface S8 and second side surface S9 are concave. The fifth lens L5 has positive optical power, and its first side surface S9 and second side surface S10 are convex. The sixth lens L6 has positive optical power, and its first side surface S11 and second side surface S12 are convex. The seventh lens L7 has positive optical power, and its first side surface S13 and second side surface S14 are convex. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0221] In this example, the total effective focal length F of the optical lens is 10.218mm, the maximum field of view (FOV) of the optical lens is 58.844°, and the total length (TTL) of the optical lens is 74.029mm.

[0222] Table 4 shows the basic structural parameters of the optical lens in Example 4, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0223]

[0224]

[0225] Table 4

[0226] In Example 4, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0227] Example 5

[0228] like Figure 5 The diagram shown is a schematic of the optical lens structure of Example 5.

[0229] like Figure 5 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0230] The first lens L1 has positive optical power, and its first side surface S1 and second side surface S2 are convex. The second lens L2 has negative optical power, and its first side surface S3 is convex and its second side surface S4 is concave. The third lens L3 has positive optical power, and its first side surface S5 and second side surface S6 are convex. The fourth lens L4 has negative optical power, and its first side surface S8 and second side surface S9 are concave. The fifth lens L5 has positive optical power, and its first side surface S9 and second side surface S10 are convex. The sixth lens L6 has positive optical power, and its first side surface S11 is concave and its second side surface S12 is convex. The seventh lens L7 has positive optical power, and its first side surface S13 is convex and its second side surface S14 is concave. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0231] In this example, the total effective focal length F of the optical lens is 10.055mm, the maximum field of view (FOV) of the optical lens is 59.034°, and the total length (TTL) of the optical lens is 73.662mm.

[0232] Table 5 shows the basic structural parameters of the optical lens in Example 5, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0233]

[0234]

[0235] Table 5

[0236] In Example 5, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0237] Example 6

[0238] like Figure 6 The diagram shown is a schematic of the optical lens structure of Example 6.

[0239] like Figure 6 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0240] The first lens L1 has positive optical power, and its first side surface S1 and second side surface S2 are convex. The second lens L2 has negative optical power, and its first side surface S3 is convex and its second side surface S4 is concave. The third lens L3 has positive optical power, and its first side surface S5 and second side surface S6 are convex. The fourth lens L4 has negative optical power, and its first side surface S8 and second side surface S9 are concave. The fifth lens L5 has positive optical power, and its first side surface S9 and second side surface S10 are convex. The sixth lens L6 has positive optical power, and its first side surface S11 is concave and its second side surface S12 is convex. The seventh lens L7 has positive optical power, and its first side surface S13 is convex and its second side surface S14 is concave. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0241] In this example, the total effective focal length F of the optical lens is 10.312mm, the maximum field of view (FOV) of the optical lens is 59.110°, and the total length (TTL) of the optical lens is 73.508mm.

[0242] Table 6 shows the basic structural parameters of the optical lens in Example 6, where the units for radius of curvature (Radius) and thickness / distance are millimeters (mm).

[0243] Surf Radius Thickness Nd Vd 1 107.3793 3.5501 1.77 49.61 2 -581.4709 4.4140 3 47.7763 3.1578 1.91 35.28 4 8.6840 16.1741 5 28.8798 2.2886 1.91 35.28 6 -25.4438 3.6209 7 unlimited 5.0795 8 -9.6627 2.7661 1.85 23.79 9 33.6702 4.3920 1.50 81.61 10 -11.4312 0.1000 11 -205.6067 2.4078 1.59 68.53 12 -19.2563 0.1000 13 25.8677 2.9932 1.77 49.61 14 242.8809 20.8543 15 unlimited 1.1000 1.51 62.91 16 unlimited 0.5100 IMA unlimited 0.0000

[0244] Table 6

[0245] In Example 6, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0246] Example 7

[0247] like Figure 7 The diagram shown is a schematic of the optical lens structure of Example 7.

[0248] like Figure 7 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0249] The first lens L1 has positive optical power, and its first side surface S1 is convex, as is its second side surface S2. The second lens L2 has negative optical power, and its first side surface S3 is convex, as is its second side surface S4. The third lens L3 has positive optical power, and its first side surface S5 is convex, as is its second side surface S6. The fourth lens L4 has negative optical power, and its first side surface S8 is concave, as is its second side surface S9. The fifth lens L5 has positive optical power, and its first side surface S9 is concave, as is its second side surface S10. The sixth lens L6 has positive optical power, and its first side surface S11 is concave, as is its second side surface S12. The seventh lens L7 has positive optical power, and its first side surface S13 is convex, as is its second side surface S14. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0250] In this example, the total effective focal length F of the optical lens is 9.977mm, the maximum field of view (FOV) of the optical lens is 58.342°, and the total length (TTL) of the optical lens is 74.597mm.

[0251] Table 7 shows the basic structural parameters of the optical lens in Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0252] Surf Radius Thickness Nd Vd 1 63.1308 3.3869 1.77 49.61 2 -235.7673 0.1000 3 34.3680 3.9883 1.91 35.28 4 8.5599 22.1180 5 44.0337 5.5098 1.91 35.28 6 -22.7946 2.4000 7 unlimited 6.6114 8 -7.5605 1.0885 1.85 23.79 9 -138.8265 2.7863 1.50 81.61 10 -8.6906 0.1000 11 -45.9578 2.2782 1.59 68.53 12 -15.0021 0.1000 13 43.5932 2.0969 1.77 49.61 14 -74.5734 20.4222 15 unlimited 1.1000 1.51 62.91 16 unlimited 0.5100 IMA unlimited 0.0000

[0253] Table 7

[0254] In Example 7, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0255] Example 8

[0256] like Figure 8 The diagram shown is a schematic of the optical lens structure of Example 8.

[0257] like Figure 8 As shown, the optical lens includes, from the first side to the second side, the following components in sequence: first lens L1, second lens L2, third lens L3, aperture stop STO, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, first side surface of protective glass S15, second side surface of protective glass S16, and imaging surface IMA.

[0258] The first lens L1 has positive optical power, and its first side surface S1 is convex, as is its second side surface S2. The second lens L2 has negative optical power, and its first side surface S3 is convex, as is its second side surface S4. The third lens L3 has positive optical power, and its first side surface S5 is convex, as is its second side surface S6. The fourth lens L4 has negative optical power, and its first side surface S8 is concave, as is its second side surface S9. The fifth lens L5 has positive optical power, and its first side surface S9 is concave, as is its second side surface S10. The sixth lens L6 has positive optical power, and its first side surface S11 is concave, as is its second side surface S12. The seventh lens L7 has positive optical power, and its first side surface S13 is convex, as is its second side surface S14. Light from the first side passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging plane IMA. Since the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented 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.

[0259] In this example, the total effective focal length F of the optical lens is 10.285mm, the maximum field of view (FOV) of the optical lens is 57.363°, and the total length (TTL) of the optical lens is 72.707mm.

[0260] Table 8 shows the basic structural parameters of the optical lens of Example 8, where the units for radius of curvature (Radius) and thickness (Thickness / Distance) are millimeters (mm).

[0261] Surf Radius Thickness Nd Vd 1 64.6286 3.3534 1.77 49.61 2 -193.1756 0.1000 3 34.8594 3.7759 1.91 35.28 4 8.0774 20.8374 5 30.2948 5.6290 1.91 35.28 6 -24.9462 2.5136 7 unlimited 5.7884 8 -7.5772 1.2691 1.85 23.79 9 -138.8265 2.5663 1.50 81.61 10 -8.9356 0.1000 11 -71.1728 2.4521 1.59 68.53 12 -17.5979 0.1000 13 38.6928 2.0969 1.77 49.61 14 -135.1330 20.5146 15 unlimited 1.1000 1.51 62.91 16 unlimited 0.5100 IMA unlimited 0.0000

[0262] Table 8

[0263] In Example 8, none of the surfaces of the first lens L1 to the seventh lens L7 are aspherical.

[0264] In summary, Examples 1 through 8 satisfy the relationships shown in Table 9.

[0265]

[0266]

[0267] Table 9

[0268] Table 10 gives the effective focal length F of the optical lenses in Examples 1 to 8, and the effective focal lengths of each lens from F1 to F7, etc. (unit: mm).

[0269] Parameters / Examples 1 2 3 4 5 6 7 8 F 10.025 10.031 10.046 10.218 10.055 10.312 9.977 10.285 FOV 59.110 58.705 59.250 58.844 59.034 59.110 58.342 57.363 F1 80.881 77.295 86.644 91.680 90.963 116.882 64.388 62.663 F2 -12.445 -12.395 -12.239 -11.997 -12.229 -12.018 -13.400 -12.273 F3 14.471 15.007 14.993 15.215 14.916 15.027 17.021 15.656 F4 -7.293 -8.116 -7.534 -8.624 -7.502 -8.506 -9.361 -9.389 F5 16.188 17.632 16.045 18.275 16.096 17.680 18.453 19.019 F6 36.949 36.959 33.984 34.545 33.244 35.510 36.405 38.603 F7 30.659 30.416 30.749 32.567 35.094 37.025 35.673 38.906 H 11.320 11.320 11.320 11.320 11.320 11.320 11.320 11.320 D 139.364 139.364 139.364 139.364 139.364 139.364 139.364 139.364 θ 1.032 1.025 1.034 1.027 1.030 1.032 1.018 1.001 BFL 22.260 22.001 22.175 22.075 22.364 22.464 22.032 22.125 TL 48.524 49.373 51.561 51.954 51.297 51.044 52.564 50.582 DMAX 24.086 24.618 26.313 25.817 25.300 26.120 26.313 23.879 ENPD 4.010 4.012 4.019 4.087 4.022 4.125 3.991 4.114 D1 24.086 24.618 26.313 25.817 25.300 26.120 26.313 23.879 TTL 70.784 71.374 73.736 74.029 73.662 73.508 74.597 72.707 Nd1 1.773 1.773 1.773 1.773 1.773 1.773 1.773 1.773 d6 3.053 3.272 3.291 3.951 3.621 3.621 2.400 2.514 R2 -185.967 -157.830 -1726.830 -757.083 -227.296 -581.471 -235.767 -193.176 sag5 0.809 0.734 0.485 0.553 0.591 0.618 0.375 0.604 sag6 -0.750 -0.613 -0.661 -0.777 -0.642 -0.679 -0.625 -0.622 R3 43.415 44.422 44.754 45.147 51.924 47.776 34.368 34.859 R4 8.829 8.793 8.528 8.411 8.923 8.684 8.560 8.077

[0270] Table 10

[0271] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0272] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0273] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0274] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens characterized in that, In order from the first side to the second side, the optical lens comprises: a first lens with positive refractive power, a first side of the first lens being convex, and a second side of the first lens being convex; a second lens with negative refractive power, a first side of the second lens being convex, and a second side of the second lens being concave; a third lens with positive refractive power, a first side of the third lens being convex, and a second side of the third lens being convex; a fourth lens with negative refractive power, a first side of the fourth lens being concave; a fifth lens with positive refractive power, a second side of the fifth lens being convex; a sixth lens with positive refractive power, a second side of the sixth lens being convex; a seventh lens with positive refractive power, a first side of the seventh lens being convex; a total number of lenses with refractive power in the optical lens is seven, the first side is an object side, and the second side is an image side; an optical total length of the optical lens, i.e., a center distance TTL from a first side center of the first lens to a center of an imaging surface, and a maximum light passing aperture DMAX of the optical lens satisfy: 2.2≤TTL / DMAX≤3.

5.

2. The optical lens of claim 1, wherein, The second side of the fourth lens is concave.

3. The optical lens of claim 1, wherein, The second side of the fourth lens is convex.

4. The optical lens of claim 1, wherein, The first side of the fifth lens is convex.

5. The optical lens of claim 1, wherein, The first side of the fifth lens is concave.

6. The optical lens of claim 1, wherein, The first side of the sixth lens is concave.

7. The optical lens of claim 1, wherein, The first side of the sixth lens is convex.

8. The optical lens of claim 1, wherein, The second side of the seventh lens is concave.

9. The optical lens of claim 1, wherein, The second side of the seventh lens is convex.

10. The optical lens of claim 1, wherein, The fourth lens and the fifth lens are cemented to form a double cemented lens.

11. The optical lens of claim 1, wherein, The optical lens further comprises a diaphragm, which is arranged between the third lens and the fourth lens.

12. The optical lens of any of claims 1 to 11, wherein, A maximum field of view angle of the optical lens corresponds to an image height H, a total focal length value F of the optical lens, and an arc θ of the maximum field of view angle of the optical lens satisfy: 0.03≤|(H-F*θ) / (F*θ)|≤0.

2.

13. The optical lens of any of claims 1 to 11, wherein, A maximum field of view angle FOV of the optical lens satisfies: 55.6°≤FOV≤100°.

14. The optical lens of any of claims 1 to 11, wherein, An optical back focal length of the optical lens, i.e., a center distance BFL from a second side center of the last lens to the center of the imaging surface, and a length of a lens group of the optical lens, i.e., a distance TL from the first side center of the first lens to the second side center of the last lens satisfy: 0.13≤BFL / TL≤0.

8.

15. The optical lens of any of claims 1 to 11, wherein, A focal length value F7 of the seventh lens and a total focal length value F of the optical lens satisfy: 1.6≤F7 / F≤5.

3.

16. The optical lens of any of claims 1 to 11, wherein, The total focal length value F of the optical lens, an entrance pupil diameter ENPD of the optical lens, and a maximum effective aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens satisfy: 0.06≤F / ENPD / D1≤0.

15.

17. The optical lens of any of claims 1 to 11, wherein, An optical total length of the optical lens, i.e., a center distance TTL from the first side center of the first lens to the center of the imaging surface, and the total focal length value F of the optical lens satisfy: 6.4≤TTL / F≤9.

5.

18. The optical lens of any of claims 1 to 11, wherein, A material refractive index Nd1 of the first lens satisfies: Nd1≥1.

42.

19. The optical lens of any of claims 1 to 11, wherein, A distance d6 between the second side of the third lens and the diaphragm and an overall optical length of the optical lens, i.e., a center distance TTL from the first side center of the first lens to the imaging surface, satisfy: d6 / TTL≥0.

015.

20. The optical lens of any of claims 1 to 11, wherein, An entire group focal length value F of the optical lens and an entrance pupil diameter ENPD of the optical lens satisfy: 1≤F / ENPD≤4.

21. The optical lens of any of claims 1 to 11, wherein, A radius of curvature R2 of the second side of the first lens and the entire group focal length value F of the optical lens satisfy: R2 / F≤0.

22. The optical lens of any of claims 1 to 11, wherein, A sag sag5 of the first side of the third lens and a sag sag6 of the second side of the third lens satisfy: 0.4≤|sag5 / sag6|≤1.

5.

23. The optical lens of any of claims 1 to 11, wherein, A focal length value F6 of the sixth lens and a focal length value F7 of the seventh lens satisfy: 0.55≤|F6 / F7|≤1.

7.

24. The optical lens of any of claims 1 to 11, wherein, A radius of curvature R3 of the second side of the second lens and a radius of curvature R4 of the first side of the second lens satisfy: |R3 / R4|≥3.

16.

25. The optical lens of any of claims 1 to 11, wherein, A focal length value F1 of the first lens and the entire group focal length value F of the optical lens satisfy: F1 / F≥3.

5.

26. The optical lens of any of claims 1 to 11, wherein, A focal length value F2 of the second lens and the entire group focal length value F of the optical lens satisfy: -2≤F2 / F≤-0.

05.

27. The optical lens of any of claims 1 to 11, wherein, A focal length value F3 of the third lens and the entire group focal length value F of the optical lens satisfy: 0.8≤F3 / F≤2.

2.

28. The optical lens of any of claims 1 to 11, wherein, A focal length value F4 of the fourth lens and the entire group focal length value F of the optical lens satisfy: -1.2≤F4 / F≤-0.

4.

29. The optical lens of any of claims 1 to 11, wherein, A focal length value F5 of the fifth lens and the entire group focal length value F of the optical lens satisfy: 0.05≤F5 / F≤4.

8.

30. The optical lens of any of claims 1 to 11, wherein, A focal length value F6 of the sixth lens and the entire group focal length value F of the optical lens satisfy: 2.5≤F6 / F≤6.

31. The optical lens of any of claims 1 to 11, wherein, A maximum light passing aperture D of the first side of the first lens corresponding to a maximum field of view angle of the optical lens, an image height H corresponding to the maximum field of view angle of the optical lens, and a maximum field of view angle FOV of the optical lens satisfy: 0.03≤D / H / FOV≤0.

8.

32. An optical lens, characterized in that, sequentially from the first side to the second side include: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with negative refractive power; a fifth lens with positive refractive power; a sixth lens with positive refractive power; a seventh lens with positive refractive power; wherein the total number of lenses with refractive power in the optical lens is seven, the first side is the object side, and the second side is the image side; an overall optical length of the optical lens, i.e., a center distance TTL from the first side center of the first lens to the imaging surface, and a maximum light passing aperture DMAX of the optical lens satisfy: 2.2≤TTL / DMAX≤3.

5.

33. The optical lens of claim 32, wherein, The first side of the first lens is a convex surface, and the second side is a convex surface.

34. The optical lens of claim 32, wherein, The first side of the second lens is a convex surface, and the second side is a concave surface.

35. The optical lens of claim 32, wherein, The first side of the third lens is a convex surface, and the second side is a convex surface.

36. The optical lens of claim 32, wherein, The first side of the fourth lens is a concave surface, and the second side is a concave surface.

37. The optical lens of claim 32, wherein, The first side of the fourth lens is concave, and the second side is convex.

38. The optical lens of claim 32, wherein, The first side of the fifth lens is convex, and the second side is convex.

39. The optical lens of claim 32, wherein, The first side of the fifth lens is concave, and the second side is convex.

40. The optical lens of claim 32, wherein, The first side of the sixth lens is concave, and the second side is convex.

41. The optical lens of claim 32, wherein, The first side of the sixth lens is convex, and the second side is convex.

42. The optical lens of claim 32, wherein, The first side of the seventh lens is convex, and the second side is concave.

43. The optical lens of claim 32, wherein, The first side of the seventh lens is convex, and the second side is convex.

44. The optical lens of claim 32, wherein, The fourth lens and the fifth lens are cemented to form a double-cemented lens.

45. The optical lens of claim 32, wherein, The optical lens further comprises a diaphragm, which is arranged between the third lens and the fourth lens.

46. The optical lens of any of claims 32-45, wherein, The image height H corresponding to the maximum field of view angle of the optical lens, the total focal length F of the optical lens, and the radian θ of the maximum field of view angle of the optical lens satisfy: 0.03≤|(H-F*θ) / (F*θ)|≤0.

2.

47. The optical lens of any of claims 32-45, wherein, The maximum field of view angle FOV of the optical lens satisfies: 55.6°≤FOV≤100°.

48. The optical lens of any of claims 32-45, wherein, The optical back focal length of the optical lens, i.e., the distance BFL from the second side center of the last lens to the center of the imaging surface, and the length TL of the lens group of the optical lens, i.e., the distance from the first side center of the first lens to the second side center of the last lens, satisfy: 0.13≤BFL / TL≤0.

8.

49. The optical lens of any of claims 32-45, wherein, The focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy: 1.6≤F7 / F≤5.

3.

50. The optical lens of any of claims 32-45, wherein, The total focal length F of the optical lens, the entrance pupil diameter ENPD of the optical lens, and the maximum effective aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens satisfy: 0.06≤F / ENPD / D1≤0.

15.

51. The optical lens of any of claims 32-45, wherein, The total optical length TTL of the optical lens, i.e., the distance from the first side center of the first lens to the center of the imaging surface, and the total focal length F of the optical lens satisfy: 6.4≤TTL / F≤9.

5.

52. The optical lens of any of claims 32-45, wherein, The material refractive index Nd1 of the first lens satisfies: Nd1≥1.

42.

53. The optical lens of any of claims 32-45, wherein, The distance d6 between the second side of the third lens and the diaphragm and the total optical length TTL of the optical lens, i.e., the distance from the first side center of the first lens to the center of the imaging surface, satisfy: d6 / TTL≥0.

015.

54. The optical lens of any of claims 32-45, wherein, The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: 1≤F / ENPD≤4.

55. The optical lens of any of claims 32-45, wherein, The sagittal height sag2 of the second side of the first lens and the total focal length F of the optical lens satisfy: R2 / F≤0.

56. The optical lens of any of claims 32-45, wherein, The sagittal height sag5 of the first side of the third lens and the sagittal height sag6 of the second side of the third lens satisfy: 0.4≤|sag5 / sag6|≤1.

5.

57. The optical lens of any of claims 32-45, wherein, The focal length F6 of the sixth lens and the focal length F7 of the seventh lens satisfy: 0.55≤|F6 / F7|≤1.

7.

58. The optical lens of any of claims 32-45, wherein, A radius of curvature R3 of a second side surface of the second lens and a radius of curvature R4 of a first side surface of the second lens satisfy: |R3 / R4|≥3.

16.

59. The optical lens of any of claims 32-45, wherein, A focal length value F1 of the first lens and a total focal length value F of the optical lens satisfy: F1 / F≥3.

5.

60. The optical lens of any of claims 32-45, wherein, A focal length value F2 of the second lens and the total focal length value F of the optical lens satisfy: -2≤F2 / F≤-0.

05.

61. The optical lens of any of claims 32-45, wherein, A focal length value F3 of the third lens and the total focal length value F of the optical lens satisfy: 0.8≤F3 / F≤2.

2.

62. The optical lens of any of claims 32-45, wherein, A focal length value F4 of the fourth lens and the total focal length value F of the optical lens satisfy: -1.2≤F4 / F≤-0.

4.

63. The optical lens of any of claims 32-45, wherein, A focal length value F5 of the fifth lens and the total focal length value F of the optical lens satisfy: 0.05≤F5 / F≤4.

8.

64. The optical lens of any of claims 32-45, wherein, A focal length value F6 of the sixth lens and the total focal length value F of the optical lens satisfy: 2.5≤F6 / F≤6.

65. The optical lens of any of claims 32-45, wherein, A maximum light passing aperture D of the first side surface of the first lens corresponding to a maximum field of view angle of the optical lens, an image height H corresponding to the maximum field of view angle of the optical lens, and a maximum field of view angle FOV of the optical lens satisfy: 0.03≤D / H / FOV≤0.

8.

66. An electronic device, comprising: An imaging element for converting an optical image formed by the optical lens into an electric signal. An imaging device comprising the optical lens according to any one of claims 1 to 65 and the imaging element for converting an optical image formed by the optical lens into an electric signal.

Images