Optical lens

Abstract

The application provides an optical lens, which has seven lenses with optical power, and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with negative optical power, whose object side surface is a concave surface and whose image side surface is a concave surface; a third lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a convex surface; a fourth lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a convex surface; a fifth lens with negative optical power, whose object side surface is a concave surface and whose image side surface is a concave surface; a sixth lens with negative optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; and a seventh lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a concave surface. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration and improves the imaging quality of the optical lens by reasonably configuring the surface shape of each lens and reasonably matching the optical power.

Description

Technical Field

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

[0002] With the continuous improvement of people's requirements for driving experience, vehicle-mounted application optical lenses are increasingly used in intelligent driving, and the status of vehicle-mounted optical lenses in the automotive related industry is continuously rising.

[0003] Advanced Driver Assistance Systems (ADAS) play an important role in intelligent driving. It collects environmental information through various lenses paired with sensors to ensure driving safety for drivers. The surround view lens is used to capture the environment around the vehicle. The images captured by multiple cameras are finally transmitted to the vehicle-mounted processor for real-time processing. The processor performs appropriate correction, stitching and fusion on these images, so as to generate a continuous, seamless, all-round 360-degree surround view image. The surround view lens generally adopts a wide-angle lens, which has problems such as poor imaging quality and is difficult to meet user demands. Therefore, it is necessary to develop an optical lens with good imaging effect. Summary of the Invention

[0004] In view of the above problems, an objective of the present invention is to provide an optical lens, which has the advantage of excellent imaging quality.

[0005] The present invention provides an optical lens, the number of lenses with optical power is seven, which sequentially includes from the object side to the imaging surface along the optical axis: A first lens with negative optical power, whose object side surface is convex and whose image side surface is concave; A second lens with negative optical power, whose object side surface is concave and whose image side surface is concave; A third lens with positive optical power, whose object side surface is convex and whose image side surface is convex; A fourth lens with positive optical power, whose object side surface is convex and whose image side surface is convex; A fifth lens with negative optical power, whose object side surface is concave and whose image side surface is concave; A sixth lens with negative optical power, whose object side surface is convex and whose image side surface is concave; A seventh lens with positive optical power, whose object side surface is convex and whose image side surface is concave; The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 10<f7 / f<14.5; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -0.34<R9 / R10<-0.03.

[0006] Further preferably, the combined focal length f13 of the first lens, the second lens and the third lens and the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.2<f13 / f47<4.5.

[0007] Further preferably, the clear half-caliber d12 of the image side of the sixth lens and the clear half-caliber d13 of the object side of the seventh lens satisfy: 0.6<d12 / d13<0.95.

[0008] Further preferably, the sag height SAG14 of the clear half-caliber of the image side of the seventh lens and the clear half-caliber d14 of the image side of the seventh lens satisfy: 0.1<SAG14 / d14<0.22.

[0009] Further preferably, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens and the focal length f3 of the third lens satisfy: 0.7<(CT2+CT3) / f3<1.45.

[0010] Further preferably, the real image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 5<IH / EPD<7.3.

[0011] Further preferably, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.75<f1 / f2<1.2.

[0012] Further preferably, the curvature radius R13 of the object side of the seventh lens and the effective focal length f of the optical lens satisfy: 1.3<R13 / f<2.7; the curvature radius R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: 1.7<R14 / f<4.5.

[0013] Further preferably, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -2<(R9-R10) / (R9+R10)<-0.95.

[0014] Further preferably, the curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: -0.28<(R13-R14) / (R13+R14)<-0.1.

[0015] The optical lens provided by the present invention adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, can improve the imaging quality of the optical lens, reduce aberrations, enhance the imaging quality of the optical lens, and endow the lens with one or more advantages such as miniaturization, large aperture, ultra-large field of view, and high imaging quality. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0018] Figure 3 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0019] Figure 4 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0020] Figure 5 This is a schematic diagram of the optical lens in Embodiment 5 of the present invention.

[0021] Figure 6 This is a schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0022] Figure 7 This is a schematic diagram of the optical lens in Embodiment 7 of the present invention.

[0023] Figure 8 This is a schematic diagram of the optical lens in Embodiment 8 of the present invention.

[0024] Figure 9 This is a schematic diagram of the optical lens in Embodiment 9 of the present invention.

[0025] Figure 10 This is a schematic diagram of the optical lens structure in Embodiment 10 of the present invention.

[0026] Figure 11 This is a schematic diagram of the optical lens structure in Embodiment 11 of the present invention.

[0027] Figure 12 This is a schematic diagram of the optical lens structure in Embodiment 12 of the present invention.

[0028] Figure 13 This is a schematic diagram of the optical lens structure in Embodiment 13 of the present invention.

[0029] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0030] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] 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 the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0032] 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 strictly to scale.

[0033] In this article, 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0034] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0035] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0036] It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other under the condition of no conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with the embodiments.

[0037] The optical lens provided by the embodiment of the present invention has seven lenses with optical power, which sequentially include, from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0038] In some implementations, the first lens may have negative optical power, with its object side surface being convex and its image side surface being concave. The second lens may have negative optical power, with its object side surface being concave and its image side surface being concave. The third lens may have positive optical power, with its object side surface being convex and its image side surface being convex. The fourth lens may have positive optical power, with its object side surface being convex and its image side surface being convex. The fifth lens may have negative optical power, with its object side surface being concave and its image side surface being concave. The sixth lens may have negative optical power, with its object side surface being convex and its image side surface being concave. The seventh lens may have positive optical power, with its object side surface being convex and its image side surface being concave.

[0039] In some implementations, the optical lens may further include a diaphragm, and the diaphragm may be located between the third lens and the fourth lens. It can be understood that the diaphragm is used to limit the amount of incoming light to change the brightness of imaging. When the diaphragm is located between the third lens and the fourth lens, it is convenient to correct the diaphragm aberration.

[0040] In some implementations, the optical lens may further include an optical filter and a protective glass, and the optical filter and the protective glass may be sequentially disposed between the seventh lens and the imaging surface along the optical axis. The optical filter is used to filter out interfering light, preventing the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass functions to protect the optical lens, preventing the photosensitive chip from being damaged and affecting the imaging effect of the lens.

[0041] In some implementations, the fourth lens and the fifth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby lowering the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0042] In some implementations, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 10<f7 / f<14.5. The seventh lens with positive optical power can further focus the light, optimize the imaging quality, and correct residual aberrations (such as distortion, chromatic aberration, etc.), so as to ensure imaging clarity and color reproduction.

[0043] In some embodiments, the curvature radius R9 of the object-side surface of the fifth lens and the curvature radius R10 of the image-side surface of the fifth lens satisfy: -0.34<R9 / R10<-0.03. Satisfying the above range can make the fifth lens have an appropriate surface shape, which is beneficial to balancing the astigmatism and field curvature of the optical lens, and improving the imaging quality of the optical lens.

[0044] In some embodiments, the combined focal length f13 of the first lens, the second lens and the third lens and the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.2<f13 / f47<4.5. Satisfying the above range can reasonably distribute the optical power proportion of the lens groups before and after the aperture stop, increase the relative illuminance of the lens, and improve the imaging quality of the lens.

[0045] In some embodiments, the clear half-aperture d12 of the image-side surface of the sixth lens and the clear half-aperture d13 of the object-side surface of the seventh lens satisfy: 0.6<d12 / d13<0.95. Satisfying the above conditions is beneficial for the lens to control light rays, suppress stray light, improve aberration balance, and enhance mechanical stability.

[0046] In some embodiments, the sag height SAG14 of the clear half-aperture of the image-side surface of the seventh lens and the clear half-aperture d14 of the image-side surface of the seventh lens satisfy: 0.1<SAG14 / d14<0.22. Reasonably controlling the sag height and aperture of the image-side surface of the seventh lens, controlling the trend of the light beam for final imaging, and ensuring the field angle of the seventh lens is within a certain range, is beneficial for the optical lens to achieve high resolution and endow the optical lens with high imaging quality.

[0047] In some embodiments, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens and the focal length f3 of the third lens satisfy: 0.7<(CT2+CT3) / f3<1.45. By reasonably setting the relationship between the center thicknesses of the second and third lenses and the focal length of the third lens, the deflection degree of light rays can be effectively alleviated, the field curvature and distortion of the system can be effectively reduced, and the imaging quality can be improved.

[0048] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 5<IH / EPD<7.3. Satisfying the above range enables the optical lens to have a large image plane while ensuring sufficient image plane brightness at the marginal field of view, preventing vignetting, thereby improving the imaging quality.

[0049] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.75<f1 / f2<1.2. By properly setting the focal length ratio of the first lens and the second lens, the system length can be shortened, the aberration and the distortion of the marginal field of view can be reduced, so that the lens has low distortion and can provide a high-definition imaging effect.

[0050] In some embodiments, the curvature radius R13 of the object side of the seventh lens and the effective focal length f of the optical lens satisfy: 1.3<R13 / f<2.7; the curvature radius R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: 1.7<R14 / f<4.5. Satisfying the above ranges and properly defining the surface shape of the seventh lens is beneficial to increasing the divergence degree of light, increasing the area of light entering the imaging surface, and realizing large target surface imaging.

[0051] In some embodiments, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -2<(R9-R10) / (R9+R10)<-0.95. By making the optical system satisfy the above relational expression, it is beneficial to reasonably configure the ratio of the curvature radius of the object side of the fifth lens to the curvature radius of the image side of the fifth lens, control the shape of the fifth lens, comprehensively balance the spherical aberration, chromatic aberration and field curvature of the optical system, reduce the risk of ghosting, improve the resolution capability of the optical system, and at the same time, help reduce the processing difficulty of the fifth lens.

[0052] In some embodiments, the curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: -0.28<(R13-R14) / (R13+R14)<-0.1. Reasonably controlling the curvature radii of the object side and the image side of the seventh lens is thus beneficial to controlling the shape of the seventh lens and correcting the aberration generated by itself.

[0053] In some embodiments, the combined focal length f13 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: 3.7<f13 / f<11.5. Meeting the above requirements, by reasonably distributing the optical power of the first lens to the third lens, the deflection angle of light at the front end of the lens is reduced, and the generation of various off-axis aberrations is reduced.

[0054] In some embodiments, the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2.3<f47 / f<3.4. Meeting the above requirements, by reasonably distributing the optical power of the fourth lens to the seventh lens, the focal length of the optical lens is balanced, the correction capability for various aberrations at the rear end of the lens is improved, and the imaging quality of the optical lens is enhanced.

[0055] In some embodiments, the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: 2.5<f45 / f<4.1. Meeting the above conditions facilitates more light to enter the cemented lens smoothly, and helps to improve illuminance.

[0056] In some embodiments, the clear half-caliber d1 of the object side surface of the first lens and the clear half-caliber d14 of the image side surface of the seventh lens satisfy: 2.6<d1 / d14<4.6. By reasonably setting the ratio of the calibers of the first and last lenses, the lens can have a small head size while having a large imaging surface, which can better meet the balance of miniaturization and high pixels.

[0057] In some embodiments, the spacing CT34 on the optical axis between the third lens and the fourth lens and the total optical length TTL of the optical lens satisfy: 0.02<CT34 / TTL<0.15. By controlling the spacing of the lens groups before and after the aperture stop, it helps to improve the structural compactness of the optical lens.

[0058] In some embodiments, the clear half-caliber d14 of the image side surface of the seventh lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.3<d14 / IH<0.45. Meeting the above conditions is beneficial to expanding the exit angle of the chief ray of the marginal field of view to the imaging surface, so as to form a large imaging surface.

[0059] In some embodiments, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the center thickness CT1 of the first lens satisfy: 2.6<R1 / (R2+CT1)<4.4. Meeting the above range can reduce the difficulty of correcting the distortion of the marginal field of view, and control the distortion within a reasonable range.

[0060] In some embodiments, the sagittal height SAG3 of the clear half-caliber of the object side surface of the second lens, the sagittal height SAG4 of the clear half-caliber of the image side surface of the second lens, and the center thickness CT2 of the second lens satisfy: 0.6<(SAG4-SAG3) / CT2<1.05. Meeting the above conditions can limit the degree of central depression of the second lens, and reduce the difficulty of aberration correction for the marginal field of view.

[0061] In some embodiments, the sagittal height SAG7 of the clear half-caliber of the object side surface of the fourth lens, the sagittal height SAG8 of the clear half-caliber of the image side surface of the fourth lens, and the center thickness CT4 of the fourth lens satisfy: -0.63<(SAG8-SAG7) / CT4<-0.35. Meeting the above conditions can control the surface shape of the object side surface of the fourth lens, which is beneficial to the manufacture and molding of the fourth lens and reduces the defective rate. In addition, it can also avoid the surface shape of this surface from being too curved and complex, so that the field curvature of the system tends to be balanced.

[0062] In some embodiments, the semi-aperture sag height SAG13 of the object side of the seventh lens, the semi-aperture sag height SAG14 of the image side of the seventh lens, and the center thickness CT7 of the seventh lens satisfy: -0.25<(SAG14-SAG13) / CT7<-0.06. Meeting the above conditions, by controlling the relationship between the sag height difference between the image side and the object side of the seventh lens and the center thickness of the seventh lens, it is beneficial to correct the coma of the off-axis field of view, and is conducive to improving the imaging quality of the off-axis field of view of the optical lens.

[0063] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8<TTL / f<11.5. It can effectively limit the length of the lens, which is beneficial to realize the miniaturization of the optical lens.

[0064] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.6<TTL / IH<3.7. It can better realize the miniaturization of the lens, and at the same time ensure that the lens has a larger image plane under the condition of the same total length, and can match an imaging chip of a larger size to realize high-definition imaging.

[0065] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: -1.15<IH / (f×tan(FOV / 2))<-0.4. Meeting the above conditional expression, by reasonably limiting the relationship among the focal length, field angle and image height of the optical lens, it is beneficial to realize the balance between the field angle of the optical lens and large-target-surface imaging, and better meet the use requirements of the optical lens for high-image-quality shooting.

[0066] In some embodiments, the maximum field angle FOV of the optical lens and the F-number Fno of the optical lens satisfy: 90°<FOV / Fno<120°. Meeting the above conditions is beneficial to increasing the light intake of the lens, so that the lens can perform high-definition imaging even in a dim environment.

[0067] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.7<IH / f<3.5. Meeting the above conditions can realize a larger field angle and imaging range, and can realize large-image-plane characteristics while ensuring the depth of field of the optical lens, thereby improving the imaging quality of the optical system.

[0068] In some embodiments, the distance BL on the optical axis from the image side of the seventh lens to the imaging plane and the effective focal length f of the optical lens satisfy: 0.75<BL / f<1.1. Meeting the above range is conducive to achieving a balance between obtaining good imaging quality and easy assembly, ensuring the imaging quality of the optical lens while avoiding interference between the lens and other components, and reducing the assembly process difficulty of the camera module.

[0069] In some embodiments, the total optical length TTL of the optical lens, the real image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.01 / °<TTL / IH / FOV<0.02 / °. Meeting the above range can achieve a balance between large image height, long focal length and miniaturization, and improve the imaging quality of the optical lens.

[0070] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 58°<f×FOV / IH<77°. Meeting the above conditional expression, by reasonably limiting the relationship among the focal length, field of view and image height of the optical lens, is conducive to realizing the balance between the field of view of the optical lens and large target surface imaging, and better meets the use requirements of the optical lens for high image quality shooting.

[0071] In some embodiments, the sum ΣCT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively and the total optical length TTL of the optical lens satisfy: 0.45<ΣCT / TTL<0.68. Meeting the above conditions can effectively compress the total length of the optical lens, and is beneficial to the structural design and production process of the optical lens.

[0072] In some embodiments, the clear half aperture d1 of the object side of the first lens, the real image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: -0.5<d1 / IH / tan(FOV / 2)<-0.15. Meeting the above range can ensure the balance among the size, field of view and image plane of the optical lens.

[0073] In some embodiments, the distance BL on the optical axis from the image side of the seventh lens to the imaging plane and the total optical length TTL of the optical lens satisfy: 0.08<BL / TTL<0.15. It is beneficial to realize the short back focal length of the optical lens, and is conducive to the miniaturization of the optical lens while ensuring sufficient space for the installation of optical elements.

[0074] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the F-number Fno of the optical lens satisfy: 2.4mm<IH / Fno<3.5mm. Meeting the above conditions can maintain a large image plane of the optical lens while ensuring a relatively large aperture of the optical lens, so as to achieve a balance between the large image plane and the large aperture.

[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.5<f1 / f<-2.6. Within the above range, light in a wide range can enter the optical lens to obtain more image information, and it is helpful to control lens distortion, reduce field curvature, and improve the geometric accuracy of the imaging plane.

[0076] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -3.7<f2 / f<-2.6. The second lens has a negative focal length, which can perform a second adjustment on the full-field light beam, perform a second deflection on the large-field light beam, and divert the light beam to the transition lens group, thereby facilitating the realization of a large field of view of the optical lens.

[0077] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2.1<f3 / f<3. Meeting the above conditions can control the direction of the optical path, provide a more reasonable incident angle of light for subsequent lenses, improve the uniformity of relative illumination, and enhance imaging quality.

[0078] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.9<f4 / f<1.45. Meeting the above conditions, the fourth lens adopts a positive focal lens with strong refractive power, which can further focus light, adjust the chief ray angle, optimize imaging quality, correct residual aberrations (such as distortion, chromatic aberration, etc.), and reduce the distortion of the wide-angle lens.

[0079] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.9<f5 / f<-1.1. Meeting the above conditions, the fifth lens adopts a negative focal lens with strong refractive power, which is beneficial to further increase the imaging area of the optical lens, balance various aberrations generated by the front lens group at the same time, and improve the imaging quality of the optical lens.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -100<f6 / f<-5. The sixth lens meeting the above conditions can balance the optical power, control the back focal offset after high and low temperature, and avoid defocusing.

[0081] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 1.9<f3 / f4<2.6. Meeting the above conditions, by reasonably setting the focal lengths of the third and fourth lenses, the convergence of light rays can be better achieved, the distance for light rays to enter the next lens is shortened, which is beneficial to realizing the miniaturization of the optical lens.

[0082] In some embodiments, the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -9.8<f6 / f7<-0.43. Meeting the above range, by reasonably setting the focal length relationship between the sixth lens and the seventh lens, the incident angle of marginal light rays can be converged, the illumination uniformity and sharpness at the edge of the frame can be improved, and at the same time, aberrations such as distortion can be finely corrected, so that the frame of the lens can obtain a high-quality, clear image without vignetting and deformation.

[0083] In some embodiments, the center thickness CT6 of the sixth lens and the center thickness CT7 of the seventh lens satisfy: 0.43<CT6 / CT7<0.95. Meeting the above conditions can reduce the sensitivity of system performance, while ensuring the machinability of the lenses and assembly stability, and improving the assembly yield.

[0084] 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: 7<R1 / f<12.5; the radius of curvature R2 of the image-side surface of the first lens and the effective focal length f of the optical lens satisfy: 1.7<R2 / f<2.4. The first lens is a meniscus negative lens. By reasonably configuring the ratios of the radii of curvature of the object-side surface and the image-side surface of the first lens to the effective focal length of the optical lens, the first lens can collect as much light with a large field of view angle as possible and allow the light to smoothly enter the rear system, increase the light throughput of the optical lens, and effectively expand the field of view range of the optical lens.

[0085] In some embodiments, the radius of curvature R7 of the object-side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 0.95<R7 / f<1.55; the radius of curvature R8 of the image-side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -1.55<R8 / f<-0.8. Meeting the above range can make the trend of light rays more stable; at the same time, it can correct coma and field curvature, improve the flatness of imaging, and enhance the imaging quality of the optical lens.

[0086] In some embodiments, the radius of curvature R9 of the object-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -1.55<R9 / f<-0.8; the radius of curvature R10 of the image-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 3.1<R10 / f<33. Meeting the above range can make the fifth lens have an appropriate surface profile, which is beneficial to balancing the astigmatism and field curvature of the optical lens, and improving the imaging quality of the optical lens.

[0087] In some embodiments, the curvature radius R13 of the object-side surface of the seventh lens and the curvature radius R14 of the image-side surface of the seventh lens satisfy: 0.55<R13 / R14<0.88. Meeting the above conditions is beneficial to light convergence, so as to adjust the trend of the marginal light beam.

[0088] 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: 0.55<(R1-R2) / (R1+R2)<0.75. The surface shape of the first lens that meets the above conditions is conducive to light divergence, obtains a larger picture, can effectively eliminate aberrations, and improves the resolution capability of the optical lens.

[0089] In some embodiments, the optical lens satisfies the conditional expressions: 1.9mm<f<2mm, 0.8mm<EPD<1.1mm, 16mm<TTL<21mm, 1.7<Fno<2.3, 38°<CRA<45°, 1.5mm<BL<2mm, 190°<FOV<220°, 5.5mm<IH<6mm; where f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the f-number of the optical lens, CRA represents the chief ray incident angle at the maximum image height of the optical lens, BL represents the distance on the optical axis from the image-side surface of the seventh lens to the imaging plane, FOV represents the maximum field of view of the optical lens, and IH represents the real image height corresponding to the maximum field of view of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention at least: has a small total optical length; has the characteristics of short focal length and wide angle, and the short-focal lens has a deep depth of field, which can maintain relatively clear both in front of and behind the subject; has an ultra-large field of view, which provides a wider shooting field of view for application scenarios such as vehicle surround view lenses, and captures more image information; has a large imaging plane, which can match a larger-size chip to achieve high-definition imaging; has a large aperture, which can achieve high-definition imaging even in complex light environments.

[0090] In some embodiments, the material of the lenses in the optical lens provided by the present invention can be glass or plastic. When the material of the lens is plastic, the production cost can be effectively reduced. In addition, when the material of the lens is glass, the geometric chromatic aberration of the optical system can be effectively corrected by utilizing the low dispersion characteristic of glass itself. In the optical lens provided by the present invention, the first lens and the third lens can be made of glass, the second lens, the fourth lens and the fifth lens can be made of plastic, and the sixth lens and the seventh lens can be made of glass or plastic. Adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce volume, improve thermal stability, and provide optical lens products with higher cost performance.

[0091] In some embodiments, the first, second, third, fourth, fifth, sixth, and seventh lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first and third lenses of this invention are spherical lenses; the second, fourth, and fifth lenses are aspherical lenses; and the sixth and seventh lenses are either spherical or aspherical lenses.

[0092] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations: ; Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0093] 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.

[0094] Example 1

[0095] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane, 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, a filter G1, and a protective glass G2.

[0096] The first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is concave. The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is convex. The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side is convex. The fifth lens L5 has negative optical power, its object side is concave, and its image side S9 is concave. The fourth lens L4 and the fifth lens L5 form a cemented lens group with positive optical power, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8. The sixth lens L6 has negative optical power, its object side S10 is convex, and its image side S11 is concave. The seventh lens L7 has positive optical power, its object side surface S12 is convex, and its image side surface S13 is concave. The object-side surface S14 and the image-side surface S15 of filter G1 are both planar. The object side S16 and the image side S17 of the protective glass G2 are both flat. The imaging plane S18 is a plane.

[0097] The first lens L1, the third lens L3, and the seventh lens L7 are glass spherical lenses, while the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are plastic aspherical lenses.

[0098] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0099] Table 1-1 The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0100] Table 1-2 Example 2

[0101] Please see Figure 2 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0102] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0103] Table 2-1 The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0104] Table 2-2 Example 3

[0105] Please see Figure 3 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0106] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0107] Table 3-1 The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0108] Table 3-2 Example 4

[0109] Please see Figure 4 The figure shown is a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0110] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0111] Table 4-1 The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0112] Table 4-2 Example 5

[0113] Please see Figure 5 The figure shown is a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0114] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0115] Table 5-1 The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0116] Table 5-2 Example 6

[0117] Please see Figure 6 The figure shown is a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The difference between this embodiment and Embodiment 1 is that the seventh lens L7 is a plastic aspherical lens; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0118] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0119] Table 6-1 The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0120] Table 6-2 Example 7

[0121] Please see Figure 7 The figure shown is a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The difference between this embodiment and Embodiment 1 is that the seventh lens L7 is a plastic aspherical lens; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0122] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0123] Table 7-1 The surface profile parameters of the aspherical lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0124] Table 7-2 Example 8

[0125] Please see Figure 8 The figure shows a schematic diagram of the structure of the optical lens 800 provided in Embodiment 8 of the present invention. The difference between this embodiment and Embodiment 1 is that the seventh lens L7 is a plastic aspherical lens; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0126] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8-1.

[0127] Table 8-1 The surface profile parameters of the aspherical lens of the optical lens 800 in Example 8 are shown in Table 8-2.

[0128] Table 8-2 Example 9

[0129] Please see Figure 9 The figure shows a schematic diagram of the structure of the optical lens 900 provided in Embodiment 9 of the present invention. The difference between this embodiment and Embodiment 1 is that the seventh lens L7 is a plastic aspherical lens; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0130] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9-1.

[0131] Table 9-1 The surface profile parameters of the aspherical lens of the optical lens 900 in Example 9 are shown in Table 9-2.

[0132] Table 9-2 Example 10

[0133] Please see Figure 10 The diagram shown is a structural schematic of the optical lens 1000 provided in Embodiment 10 of the present invention. The difference between this embodiment and Embodiment 1 is that the sixth lens L6 is a glass spherical lens; the seventh lens L7 is a plastic aspherical lens; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0134] The relevant parameters of each lens in the optical lens 1000 in Example 10 are shown in Table 10-1.

[0135] Table 10-1 The surface profile parameters of the aspherical lens of the optical lens 1000 in Example 10 are shown in Table 10-2.

[0136] Table 10-2 Example 11

[0137] Please see Figure 11The figure shown is a schematic diagram of the structure of the optical lens 1100 provided in Embodiment 11 of the present invention. The difference between this embodiment and Embodiment 1 is that: the sixth lens L6 is a glass spherical lens; the seventh lens L7 is a plastic aspherical lens; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0138] The relevant parameters of each lens in the optical lens 1100 in Example 11 are shown in Table 11-1.

[0139] Table 11-1 The surface profile parameters of the aspherical lens of the optical lens 1100 in Example 11 are shown in Table 11-2.

[0140] Table 11-2 Example 12

[0141] Please see Figure 12 The diagram shown is a structural schematic of the optical lens 1200 provided in Embodiment 12 of the present invention. The difference between this embodiment and Embodiment 1 is that: the sixth lens L6 is a glass spherical lens; the seventh lens L7 is a plastic aspherical lens; the fourth lens L4 and the fifth lens L5 are not cemented lens groups; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0142] The relevant parameters of each lens in the optical lens 1200 in Example 12 are shown in Table 12-1.

[0143] Table 12-1 The surface profile parameters of the aspherical lens of the optical lens 1200 in Example 12 are shown in Table 12-2.

[0144] Table 12-2 Example 13

[0145] Please see Figure 13 The diagram shown is a structural schematic of the optical lens 1300 provided in Embodiment 13 of the present invention. The difference between this embodiment and Embodiment 1 is that: the sixth lens L6 is a glass spherical lens; the seventh lens L7 is a plastic aspherical lens; the fourth lens L4 and the fifth lens L5 are not cemented lens groups; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0146] The relevant parameters of each lens in the optical lens 1300 in Example 13 are shown in Table 13-1.

[0147] Table 13-1 The surface profile parameters of the aspherical lens of the optical lens 1300 in Example 13 are shown in Table 13-2.

[0148] Table 13-2 Please refer to Table 14 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, distance BL from the image side of the seventh lens to the imaging plane on the optical axis, and the numerical values ​​corresponding to each conditional expression in each embodiment.

[0149] Table 14 In summary, the optical lens provided by the present invention employs seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as miniaturization, large aperture, ultra-wide field of view, and high imaging quality.

[0150] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0151] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising seven lenses having optical power, characterized in that, Along the optical axis from the object side to the imaging plane, the system sequentially comprises: a first lens with negative optical power, wherein the object side surface thereof is convex, and the image side surface thereof is concave; a second lens with negative optical power, wherein the object side surface thereof is concave, and the image side surface thereof is concave; a third lens with positive optical power, wherein the object side surface thereof is convex, and the image side surface thereof is convex; a fourth lens with positive optical power, wherein the object side surface thereof is convex, and the image side surface thereof is convex; a fifth lens with negative optical power, wherein the object side surface thereof is concave, and the image side surface thereof is concave; a sixth lens with negative optical power, wherein the object side surface thereof is convex, and the image side surface thereof is concave; a seventh lens with positive optical power, wherein the object side surface thereof is convex, and the image side surface thereof is concave; The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 10<f7 / f<14.5; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -0.34<R9 / R10<-0.

03.

2. The optical lens according to claim 1, characterized in that, The combined focal length f13 of the first lens, the second lens and the third lens and the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.2<f13 / f47<4.

5.

3. The optical lens according to claim 1, characterized in that, The clear aperture half-diameter d12 of the image side surface of the sixth lens and the clear aperture half-diameter d13 of the object side surface of the seventh lens satisfy: 0.6<d12 / d13<0.

95.

4. The optical lens according to claim 1, characterized in that, The sag height SAG14 of the clear aperture half-diameter of the image side surface of the seventh lens and the clear aperture half-diameter d14 of the image side surface of the seventh lens satisfy: 0.1<SAG14 / d14<0.

22.

5. The optical lens according to claim 1, characterized in that, The center thickness CT2 of the second lens, the center thickness CT3 of the third lens and the focal length f3 of the third lens satisfy: 0.7<(CT2+CT3) / f3<1.

45.

6. The optical lens according to claim 1, characterized in that, The real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 5<IH / EPD<7.

3.

7. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.75<f1 / f2<1.

2.

8. The optical lens according to claim 1, characterized in that, The radius of curvature R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 1.3<R13 / f<2.7; the radius of curvature R14 of the image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 1.7<R14 / f<4.

5.

9. The optical lens according to claim 1, characterized in that, The radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -2<(R9-R10) / (R9+R10)<-0.

95.

10. The optical lens according to claim 1, characterized in that, 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: -0.28<(R13-R14) / (R13+R14)<-0.1.

Images