Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses arranged along an optical axis from an object side to an imaging surface, and the seven lenses are: a first lens with negative optical power, the object side surface of which is a concave surface and the image side surface of which is a concave surface; a second lens with positive optical power, the object side surface of which is a concave surface and the image side surface of which is a convex surface; a third lens with negative optical power, the object side surface of which is a concave surface and the image side surface of which is a convex surface; a fourth lens with positive optical power, the object side surface of which is a convex surface and the image side surface of which is a convex surface; a fifth lens with negative optical power, the object side surface of which is a concave surface and the image side surface of which is a concave surface; a sixth lens with positive optical power, the object side surface of which is a convex surface and the image side surface of which is a convex surface; and a seventh lens with negative optical power, the object side surface of which is a concave surface and the image side surface of which is a concave surface. The application realizes the effects of large field of view, large aperture and miniaturization by reasonably matching the lens shapes and optical power combinations of the lenses.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens, in particular to an optical lens. BACKGROUND

[0002] With the increasing demand for driving experience, vehicle application type optical lenses are increasingly used in intelligent driving, and vehicle optical lenses are continuously improving in the automotive industry.

[0003] The intelligent cabin is also called the intelligent automobile occupant monitoring system (OMS), which is to ensure the safety of the driver and also to ensure the safety of the passengers and the driving experience in the car. In addition to the safety problem in the cabin, the passenger's driving experience is one of the meanings of the intelligent cabin. The intelligent automobile occupant monitoring system (OMS) on the market requires a larger field of view and higher optical performance, so a full glass structure is often used and the volume is large, which is not conducive to the integration of the optical lens and the reduction of the cost. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens which can at least solve one or more of the above problems.

[0005] To achieve the above purpose, the present application provides an optical lens, which has seven lenses arranged along the optical axis from the object side to the imaging surface in order: a first lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface; a second lens with positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a third lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fourth lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a fifth lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface; a sixth lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; and a seventh lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface.

[0006] In some embodiments, the fifth lens and the sixth lens are cemented to form a cemented lens.

[0007] In some embodiments, the diaphragm is arranged between the third lens and the fourth lens.

[0008] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: TTL / f < 4.0.

[0009] In some embodiments, the total optical length TTL of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy: TTL / IH < 2.3.

[0010] In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the image height IH corresponding to the maximum field angle FOV of the optical lens satisfy: 75.0 < f*FOV / IH < 110.0.

[0011] In some embodiments, the object-side aperture diameter D1 of the first lens and the image height IH corresponding to the maximum field angle FOV of the optical lens satisfy: 0.9 < D1 / IH < 1.2.

[0012] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f < -1.4.

[0013] In some embodiments, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: f3 / f < -1.5.

[0014] In some embodiments, the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: f7 / f < -0.6.

[0015] In some embodiments, the radius of curvature R1 of the object-side surface of the first lens and the effective focal length f of the optical lens satisfy: R1 / f < -10.0.

[0016] In some embodiments, the radius of curvature R3 of the object-side surface of the second lens and the effective focal length f of the optical lens satisfy: R3 / f < -5.0.

[0017] In some embodiments, the radius of curvature R5 of the object-side surface of the third lens and the effective focal length f of the optical lens satisfy: R5 / f < -0.5.

[0018] In some embodiments, the radius of curvature R12 of the image-side surface of the sixth lens and the effective focal length f of the optical lens satisfy: R12 / f < -0.5.

[0019] In some embodiments, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 1.10 < (R1-R2) / (R1+R2).

[0020] In some embodiments, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0.5 < (R3-R4) / (R3+R4) < 0.95.

[0021] In some embodiments, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: -0.6 < (R5-R6) / (R5+R6) < -0.3.

[0022] In some embodiments, the seventh lens has a radius of curvature R13 on the object side and a radius of curvature R14 on the image side, and the following condition is satisfied: 1.0 < |(R13-R14) / (R13+R14)|.

[0023] In some embodiments, the second lens has a sagittal height of a half light entrance radius Sag3 on the object side and a half light entrance radius d3 on the object side, and the following condition is satisfied: -0.15 < Sag3 / d3 < -0.10.

[0024] In some embodiments, the second lens has a sagittal height of a half light entrance radius Sag4 on the image side and a half light entrance radius d4 on the image side, and the following condition is satisfied: -0.25 < Sag4 / d4 < -0.15.

[0025] In some embodiments, the third lens has a sagittal height of a half light entrance radius Sag5 on the object side and a half light entrance radius d5 on the object side, and the following condition is satisfied: -0.25 < Sag5 / d5 < -0.10.

[0026] In some embodiments, the sixth lens has a sagittal height of a half light entrance radius Sag12 on the image side and a half light entrance radius d12 on the image side, and the following condition is satisfied: -0.35 < Sag12 / d12 < -0.20.

[0027] In some embodiments, the sum of the central thicknesses of the first lens to the seventh lens ∑CT and the total track length of the optical lens TTL satisfy the following condition: 0.60 < ∑CT / TTL < 0.80.

[0028] Compared with the prior art, the optical lens provided by the present application has the following beneficial effects: the optical lens provided by the present application adopts seven lenses with optical power, and by reasonably matching the optical power and surface shape of each lens, the optical lens has a compact structure and good imaging quality; meanwhile, by reasonably setting the stop position, lens thickness and lens spacing, the optical lens has a large field of view and a large aperture, realizes the balance of a large field of view, a large aperture, miniaturization and high pixels, and can meet the imaging requirements of a vehicle-mounted lens. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0030] Figure 2 FIG. 2 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0031] Figure 3 FIG. 3 is a relative luminance curve of the optical lens according to the embodiment of the present application.

[0032] Figure 4 FIG. 4 is an MTF curve of the optical lens according to the embodiment of the present application.

[0033] Figure 5 A structure diagram of an optical lens according to Embodiment 2 of the present application.

[0034] Figure 6 A field curvature curve of the optical lens according to Embodiment 2 of the present application.

[0035] Figure 7 A relative luminance curve of the optical lens according to Embodiment 2 of the present application.

[0036] Figure 8 An MTF curve of the optical lens according to Embodiment 2 of the present application.

[0037] Figure 9 A structure diagram of an optical lens according to Embodiment 3 of the present application.

[0038] Figure 10 A field curvature curve of the optical lens according to Embodiment 3 of the present application.

[0039] Figure 11 A relative luminance curve of the optical lens according to Embodiment 3 of the present application.

[0040] Figure 12 An MTF curve of the optical lens according to Embodiment 3 of the present application. DETAILED DESCRIPTION

[0041] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed description are merely descriptive of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals will refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0043] In the drawings, the thickness, size, and shape of lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0044] In the present disclosure, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens.

[0045] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when terms such as "at least one of", "one or more of", or "at least an embodiment" are used in the description, they are used to mean that one or more embodiments include the feature or elements, but not necessarily including the other features or elements. In addition, when describing embodiments of the present application, the word "may" is used to mean that one or more embodiments of the present application. And the word "exemplary" is intended to mean an example or illustration.

[0046] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when terms such as "at least one of", "one or more of", or "at least an embodiment" are used in the description, they are used to mean that one or more embodiments include the feature or elements, but not necessarily including the other features or elements. In addition, when describing embodiments of the present application, the word "may" is used to mean that one or more embodiments of the present application. And the word "exemplary" is intended to mean an example or illustration.

[0047] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0048] The optical lens according to the embodiments of the present application comprises, in order from the object side to the imaging plane, a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and a filter, and the optical centers of the lenses are located on the same straight line.

[0049] In some embodiments, the first lens is configured to have a negative focal power, and the object side surface is concave and the image side surface is concave, which can reduce the overall length of the lens, while helping to reduce axial and radial astigmatism, making the imaging clearer and sharper, and improving the imaging quality of the optical lens.

[0050] In some embodiments, the second lens is configured to have positive focal power, and the object-side surface is concave and the image-side surface is convex, so as to effectively restrain the large-angle light rays passing through the first lens, slow down the light rays transition, balance the aberration generated by the first lens, and reduce the sensitivity of the optical lens.

[0051] In some embodiments, the third lens is configured to have negative focal power, and the object-side surface is concave and the image-side surface is convex, so as to better control the path and distribution of the light beams, make the light rays pass through the aperture more uniformly, and effectively improve the uniformity of the imaging image of the optical lens.

[0052] In some embodiments, the fourth lens is configured to have positive focal power, and the object-side surface is convex and the image-side surface is convex, so as to further converge the light rays, reduce the height of the light rays, make the light rays transition smoothly, balance the spherical aberration and field curvature generated by the front lenses, and improve the imaging quality of the optical lens.

[0053] In some embodiments, the fifth lens and the sixth lens are bonded to form a bonded lens, so as to share the chromatic aberration correction of the optical lens and improve the resolution of the optical lens; the fifth lens is configured to have negative focal power, and the object-side surface is concave and the image-side surface is concave; the sixth lens is configured to have positive focal power, and the object-side surface is convex and the image-side surface is convex, so as to converge the light rays emitted from the fourth lens and make the light rays transition smoothly, correct various aberrations generated by the front lenses, reduce the loss of light rays in each field of view, improve the relative luminance of each field of view, and thus improve the imaging quality of the optical lens.

[0054] In some embodiments, the seventh lens is configured to have negative focal power, and the object-side surface is concave and the image-side surface is concave, so as to properly diverge the light rays, increase the imaging area of the optical lens, make the angle of the light rays to the image surface meet the CRA requirement, and improve the resolution and luminance.

[0055] In some embodiments, the aperture is arranged between the third lens and the fourth lens, so as to converge the range of the light rays emitted from the front lenses, reduce the aperture of the rear lenses, and balance the structure of the front lens group and the rear lens group.

[0056] In some embodiments, the aperture value FNO of the optical lens satisfies 1.80<FNO<2.10. Satisfying the above range is conducive to realizing the large-aperture characteristic, and the image can be ensured to be clear in a weak light environment or at night.

[0057] In some embodiments, the maximum field of view FOV of the optical lens satisfies 160°<FOV. Satisfying the above range is conducive to realizing the wide-angle characteristic, so as to be able to obtain more scene information and meet the demand of large-range detection.

[0058] In some implementations, the angle of incidence (CRA) of the principal ray at the maximum field of view of the optical lens on the image plane satisfies: 20° < CRA < 30°. Meeting this range allows for a larger tolerance range between the CRA of the optical lens and the CRA of the image sensor, improving the optical lens's adaptability to image sensors.

[0059] In some implementations, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: TTL / f < 4.0. Meeting this range can effectively limit the length and volume of the optical lens, enabling miniaturization of the optical lens.

[0060] In some implementations, the total optical length (TTL) of the optical lens and the image height (IH) corresponding to the maximum field of view of the optical lens satisfy the condition: TTL / IH < 2.3. Meeting this range enables large-area imaging with the optical lens while simultaneously shortening the total optical length, thereby achieving a balance between optical lens miniaturization and large-area imaging, and enhancing market competitiveness.

[0061] In some implementations, the effective focal length f of the optical lens, the maximum field of view (FOV) of the optical lens, and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 75.0 < f * FOV / IH < 110.0. Meeting this range ensures that the field of view is increased while maintaining the same image plane size, achieving greater distortion, i.e., increasing the angular resolution of the central region.

[0062] In some embodiments, the light-transmitting aperture D1 of the object-side surface of the first lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy the condition: 0.9 < D1 / IH < 1.2. Satisfying the above range can balance the relationship between the front aperture of the optical lens and the image plane.

[0063] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f < -1.4. Satisfying this range allows the first lens to have appropriate negative optical power, which helps to make the change in the refraction angle of the incident light more gradual, avoids excessive refraction changes that would produce too many aberrations, and at the same time helps more light to enter the rear lens, increasing the field of view of the optical lens and improving the relative illumination of the optical lens.

[0064] In some embodiments, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy the condition: f3 / f < -1.5. Satisfying this range allows the third lens to have appropriate negative optical power, which is beneficial for expanding the effective field of view of the optical lens, allowing more light to enter the optical lens, while better controlling the path and distribution of the light beam, making the light pass through the aperture more uniformly, and effectively improving the uniformity of the image formed by the optical lens.

[0065] In some embodiments, the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: f7 / f <-0.6. Satisfying the above range, the seventh lens can have appropriate negative refractive power, which is beneficial to increase the incident angle of light into the imaging surface, further increase the imaging area of the optical lens, and realize large target surface imaging of the optical lens.

[0066] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: R1 / f <-10.0. Satisfying the above range, the surface curvature of the object side surface of the first lens can be effectively controlled, the front end diameter of the optical lens is controlled while the field of view is increased, and the total length of the optical lens is also beneficial.

[0067] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: R3 / f <-5.0. Satisfying the above range, the surface curvature of the object side surface of the second lens can be effectively controlled, the light emitted by the first lens is smoothly accepted, which is beneficial to reduce the front end diameter of the lens and make the light transition smoothly in the lens; the generation of aberration can also be reduced, and the imaging quality of the optical lens is improved.

[0068] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: R5 / f <-0.5. Satisfying the above range, the front light can be accepted and concentrated, and the light of the edge field of view will have a smaller optical path than the light of the center field of view after passing through the third lens, which changes the light trend of the edge field of view, is beneficial to correct the edge field of view aberration, and improves the imaging quality of the optical lens.

[0069] In some embodiments, the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: R12 / f <-0.5. Satisfying the above range, the light of the edge field of view has a converging trend after passing through the image side surface of the sixth lens, which lowers the position of the light incident into the subsequent lens, reduces the rear end diameter, and realizes miniaturization.

[0070] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 1.10<(R1-R2) / (R1+R2). Satisfying the above range, the surface curvature of the object side surface of the first lens can be effectively controlled, the front end diameter of the optical lens is controlled while the field of view is increased, and the total length of the optical lens is also beneficial.

[0071] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5 < (R3-R4) / (R3+R4) < 0.95. Satisfying the above range, the curvature of the object side surface of the second lens can be effectively controlled, the light passing through the second lens is converged, which is conducive to the reduction of the front aperture, and the incidence height of the large-angle light can be reduced, thereby reducing the rear aperture of the lens and the total length of the optical lens.

[0072] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -0.6 < (R5-R6) / (R5+R6) < -0.3. Satisfying the above range, the requirement of the third lens on the distance of the incident light from the optical axis can be reduced, which is conducive to the reduction of the front aperture of the lens and the smooth transition of the light in the lens.

[0073] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 1.0 < |(R13-R14) / (R13+R14)|. Satisfying the above range, the light emitted by the sixth lens can be received as much as possible, and the imaging surface is increased, thereby improving the imaging quality of the optical lens.

[0074] In some embodiments, the half-horn sag Sag3 of the object side surface of the second lens and the half-horn diameter d3 of the object side surface of the second lens satisfy: -0.15 < Sag3 / d3 < -0.10. Satisfying the above range, the small opening angle of the object side surface of the second lens can be controlled, the details of the central field of view of the optical lens can be highlighted, and the imaging quality of the optical lens is improved.

[0075] In some embodiments, the half-horn sag Sag4 of the image side surface of the second lens and the half-horn diameter d4 of the image side surface of the second lens satisfy: -0.25 < Sag4 / d4 < -0.15. Satisfying the above range, the object side surface and the image side surface of the second lens can adopt an approximately concentric circular structure, the field curvature can be optimized, and the imaging quality of the optical lens is improved.

[0076] In some embodiments, the half-horn sag Sag5 of the object side surface of the third lens and the half-horn diameter d5 of the object side surface of the third lens satisfy: -0.25 < Sag5 / d5 < -0.10. Satisfying the above range, the image side surface of the second lens and the object side surface of the third lens can adopt an approximately concentric circular structure, the ghost reflection energy can be reduced, and the imaging quality of the optical lens is improved.

[0077] In some embodiments, an image-side half-sagittal height of the sixth lens Sag12 and a half-sagittal diameter of the sixth lens d12 satisfy: -0.35 < Sag12 / d12 < -0.20. Satisfying the above range can make the sixth lens effectively correct off-axis aberration and improve imaging quality.

[0078] In some embodiments, a sum of central thicknesses of the first lens to the seventh lens ∑CT and an overall optical length of the optical lens TTL satisfy: 0.60 < ∑CT / TTL < 0.80. Satisfying the above range is conducive to compressing the overall length and volume of the optical lens and maintaining miniaturization of the optical lens.

[0079] As an embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can be all-plastic lenses or glass-plastic hybrid lenses, both of which can achieve good imaging effects. In the present application, in order to further reduce production costs and improve imaging quality, a seven-piece all-plastic lens structure is adopted.

[0080] As an embodiment, at least one of the object side or the image side of the first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens is aspherical. The aspherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens, which is different from the spherical lens with constant curvature from the center of the lens to the periphery of the lens. The aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After the aspherical lens is adopted, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0081] In order to make the system have better optical performance, multiple aspherical lenses are adopted in the lens, and each aspherical surface shape of the optical lens satisfies the following equation:

[0082]

[0083] wherein z is the distance of the curved surface to the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, A, B, C, D, E, F, and G are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, and fourteenth-order curved surface coefficients, respectively.

[0084] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0085] Example 1

[0086] Please see Figure 1 The diagram shows a schematic of the structure of an optical lens provided in Embodiment 1 of the present invention. The optical lens includes, along the optical axis from the object side to the imaging plane S17, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0087] Among them, the first lens L1 is a plastic aspherical lens with negative optical power, its object-side surface S1 is concave, and its image-side surface S2 is concave; the second lens L2 is a plastic aspherical lens with positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex; the third lens L3 is a plastic aspherical lens with negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex; the fourth lens L4 is a plastic aspherical lens with positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex; the fifth lens L5... The first lens is a plastic aspherical lens with negative optical power, whose object-side surface S9 is concave and image-side surface is concave; the sixth lens L6 is a plastic aspherical lens with positive optical power, whose object-side surface S11 is convex, and the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens, with the cementing surface being S10; the seventh lens L7 is a plastic aspherical lens with negative optical power, whose object-side surface S12 is concave and image-side surface S13 is concave; the filter G1 has object-side surface S14 and image-side surface S15 both being planar.

[0088] The relevant parameters of each lens in the optical lens of Example 1 are shown in Table 1-1.

[0089] Table 1-1

[0090]

[0091] The surface coefficients of the aspherical lens in the optical lens of Example 1 are shown in Table 1-2.

[0092] Table 1-2

[0093]

[0094]

[0095] Figure 2 The field curvature curve of the optical lens of the embodiment 1 is shown, which represents the bending degree of the light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.4 mm, which shows that the optical lens can correct the field curvature.

[0096] Figure 3 The relative luminance curve of the optical lens of the embodiment 1 is shown, which represents the relative luminance value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). It can be seen from the figure that the relative luminance value of the optical lens is still greater than 60% at the maximum half field angle, which shows that the optical lens has good relative luminance.

[0097] Figure 4 The modulation transfer function (MTF) curve of the optical lens of the embodiment 1 is shown, which represents the imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the embodiment is above 0.2 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0098] Embodiment 2

[0099] Please refer to Figure 5 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application, the optical lens in the embodiment is substantially the same as the optical lens in the above-mentioned embodiment 1 in structure, and the difference mainly lies in that the curvature radius, the asphericity coefficient, the thickness and the like of each lens surface are different.

[0100] The related parameters of each lens in the optical lens in the embodiment 2 are shown in Table 2-1.

[0101] Table 2-1

[0102]

[0103] The surface coefficients of the asphericity lens of the optical lens in the embodiment 2 are shown in Table 2-2.

[0104] Table 2-2

[0105]

[0106]

[0107] Figure 6 to Figure 8 The field curvature curve, relative illumination curve, and modulation transfer function (MTF) curve of Example 2 are shown respectively. As can be seen from the figures, the field curvature of the meridional and sagittal image planes is controlled within ±0.3 mm, indicating that the optical lens can correct field curvature. At the maximum half-field angle, the relative illumination value of the optical lens is still greater than 30%, indicating that the optical lens has a certain relative illumination. The MTF value of the optical lens is above 0.1 throughout the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating a certain level of imaging quality and detail resolution at both low and high frequencies.

[0108] Example 3

[0109] Please see Figure 9 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 3 of the present invention. The structure of the optical lens in this embodiment is roughly the same as that of the optical lens in Embodiment 1 above. The main difference is that the curvature radius, aspherical coefficient, thickness and other properties of each lens surface are different.

[0110] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0111] Table 3-1

[0112]

[0113]

[0114] The surface coefficients of the aspherical lens in Example 3 are shown in Table 3-2.

[0115] Table 3-2

[0116] Face No. K A B C S1 8.53E+01 0.00E+00 1.28E-03 -4.37E-05 S2 -1.05E+00 0.00E+00 4.93E-03 8.98E-04 S3 -2.00E+02 0.00E+00 -2.40E-02 -1.59E-03 S4 5.39E+00 0.00E+00 7.43E-03 -1.28E-02 S5 -1.21E+01 0.00E+00 2.69E-03 -1.52E-03 S6 -8.56E+01 0.00E+00 -2.24E-02 1.33E-02 S7 1.41E+00 0.00E+00 -7.87E-02 6.36E-03 S8 -4.51E+00 0.00E+00 -2.18E-02 -1.16E-03 S9 -7.90E+01 0.00E+00 7.50E-03 -2.11E-03 S10 3.20E-01 0.00E+00 2.67E-02 -3.56E-03 S11 -7.16E+00 0.00E+00 -5.36E-03 1.79E-03 S12 3.42E+02 0.00E+00 -3.18E-02 2.75E-03 S13 -9.41E+00 0.00E+00 -2.10E-02 2.30E-03 Face No. D E F G S1 -1.34E-06 -1.73E-07 5.32E-08 S2 -3.39E-04 1.50E-04 -1.86E-05 S3 -7.96E-05 3.24E-04 -5.41E-05 S4 1.14E-02 -3.40E-03 4.70E-04 S5 4.45E-03 -1.37E-03 2.91E-04 S6 -4.11E-04 -3.48E-03 1.60E-03 S7 -6.96E-03 1.31E-03 -9.30E-04 S8 -3.72E-03 2.10E-03 -5.59E-04 S9 1.40E-03 -1.77E-05 -3.42E-05 S10 -6.82E-04 6.38E-04 -1.23E-04 S11 7.78E-05 -2.59E-05 3.45E-06 S12 -3.36E-04 7.94E-05 -3.96E-06 -2.02E-06 S13 -3.31E-04 3.47E-05 -4.17E-06 1.81E-07

[0117] Figure 10 to Figure 12 The field curvature curve, relative illumination curve, and modulation transfer function (MTF) curve of Example 3 are shown respectively. As can be seen from the figures, the field curvature of the meridional and sagittal image planes is controlled within ±0.08 mm, indicating that the optical lens can effectively correct field curvature. At the maximum half-field angle, the relative illumination value of the optical lens is still greater than 60%, indicating that the optical lens has excellent relative illumination. The MTF value of the optical lens is above 0.3 throughout the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and good detail resolution at both low and high frequencies.

[0118] Please refer to Table 4, which shows the optical characteristics of the above three embodiments, including effective focal length f of the optical lens, maximum field of view FOV, entrance pupil diameter EPD, total track length TTL, F number FNO, image height IH corresponding to the maximum field of view, incident angle of chief ray on the image plane CRA corresponding to the maximum field of view, and the numerical value corresponding to each conditional expression in each embodiment.

[0119] Table 4

[0120] Parameters and Conditional Expressions Example 1 Example 2 Example 3 f (mm) 3.04 3.16 2.81 FOV (°) 176.00 176.00 166.00 EPD (mm) 1.52 1.67 1.41 TTL (mm) 11.27 10.92 11.01 FNO 2.00 1.90 2.00 IH (mm) 5.95 5.35 5.92 CRA (°) 28.02 21.56 26.20 TTL / f 3.70 3.45 3.91 TTL / IH 1.89 2.04 1.86 f*FOV / IH 90.01 104.12 78.85 D1 / IH 1.05 1.17 0.94 f1 / f -2.68 -3.54 -1.55 f3 / f -1.89 -1.78 -2.75 f7 / f -0.90 -0.82 -0.92 R1 / f -13.04 -11.11 -20.56 R3 / f -5.66 -5.30 -59.51 R5 / f -0.57 -0.55 -0.89 R12 / f -0.85 -0.85 -0.63 (R1-R2) / (R1+R2) 1.38 1.75 1.11 (R3-R4) / (R3+R4) 0.64 0.63 0.94 (R5-R6) / (R5+R6) -0.44 -0.45 -0.48 (R13-R14) / (R13+R14) -1.05 -1.08 1.09 Sag3 / d3 -0.15 -0.15 -0.15 Sag4 / d4 -0.21 -0.21 -0.16 Sag5 / d5 -0.24 -0.24 -0.13 Sag12 / d12 -0.24 -0.34 -0.26 ΣCT / TTL 0.68 0.69 0.72

[0121] In summary, the optical lens in the embodiments of the present application can realize the effects of large field of view (the maximum FOV value is 176°), large aperture (the minimum FNO value is 1.90), miniaturization (the minimum TTL value is 10.92mm) and high pixels by reasonably distributing the refractive power of each lens, reasonably matching the surface shape of each lens, and reasonably setting the thickness of each lens and the distance between each lens, while adopting the matching structure of seven plastic aspherical lenses, thereby meeting the requirements of vehicle-mounted lens for image pickup.

[0122] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0123] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation on the scope of the patent of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses in order from an object side to an image side along an optical axis as follows: a first lens with negative refractive power, whose object side surface is concave and whose image side surface is concave; a second lens with positive refractive power, whose object side surface is concave and whose image side surface is convex; a third lens with negative refractive power, whose object side surface is concave and whose image side surface is convex; a fourth lens with positive refractive power, whose object side surface is convex and whose image side surface is convex; a fifth lens with negative refractive power, whose object side surface is concave and whose image side surface is concave; a sixth lens with positive refractive power, whose object side surface is convex and whose image side surface is convex; and a seventh lens with negative refractive power, whose object side surface is concave and whose image side surface is concave; wherein a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the image side surface of the second lens satisfy 0.5 < (R3-R4) / (R3+R4) < 0.95; a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the image side surface of the seventh lens satisfy 1.0 < |(R13-R14) / (R13+R14)| ≤ 1.09; and an image side surface sagittal height Sag12 of the sixth lens and a half-diameter d12 of the image side surface of the sixth lens satisfy -0.35 < Sag12 / d12 < -0.

20. The total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy 3.45 ≤ TTL / f < 4.

0. The total track length TTL of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy 1.86 ≤ TTL / IH < 2.

3. The effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the image height IH corresponding to the maximum field of view of the optical lens satisfy 75.0° < f*FOV / IH < 110.0°. The half-diameter D1 of the object side surface of the first lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy 0.9 < D1 / IH < 1.

2. The radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy 1.10 < (R1-R2) / (R1+R2) ≤ 1.

75. The radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy -0.6 < (R5-R6) / (R5+R6) < -0.

3. The image side surface sagittal height Sag3 of the second lens and the half-diameter d3 of the object side surface of the second lens satisfy -0.15 < Sag3 / d3 < -0.

10. wherein The radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy 0.63 ≤ (R3-R4) / (R3+R4) ≤ 0.

94. The radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy 1.05 ≤ |(R13-R14) / (R13+R14)| ≤ 1.

09. ​ 2. The optical lens of claim 1, wherein, ​ 3. The optical lens of claim 1, wherein, ​ 4. The optical lens of claim 1, wherein, ​ 5. The optical lens of claim 1, wherein, ​ 6. The optical lens of claim 1, wherein, ​ 7. The optical lens of claim 1, wherein, ​ 8. The optical lens of claim 1, wherein, ​ 9. The optical lens of claim 1, wherein, ​ ​ An image-side surface sagittal half-aperture radius Sag12 of the sixth lens satisfies: -0.34≤Sag12 / d12≤-0.

24.

10. The optical lens of claim 1, wherein, A sum ∑CT of central thicknesses of the first lens to the seventh lens satisfies: 0.60<∑CT / TTL<0.80.

Images