Optical lens

Abstract

The application provides an optical lens, which has ten 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 positive optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a third lens with negative optical power; 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 convex surface; a sixth lens with negative optical power; a seventh lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a convex surface; an eighth lens with positive optical power; a ninth lens with negative optical power; and a tenth lens with positive optical power. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens.

Description

Technical Field

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

[0002] In the field of modern motion image capture, high-performance portable optical systems are the core demand. Most motion camera lenses currently on the market adopt a large-aperture and ultra-wide-angle design to adapt to high-speed motion scenarios and extreme environment shooting. However, these traditional optical structures generally have the problems of reduced imaging quality in low-light environments and insufficient dynamic range. At the same time, the increase of the field of view of the lens leads to difficulty in aberration correction of the system and degradation of imaging quality; in addition, the existing lens has a small imaging target surface, which is difficult to meet market demands. Summary of the Invention

[0003] In view of the above problems, the object of the present invention is to provide an optical lens, which has the advantage of excellent imaging quality.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: An optical lens has ten lenses with optical power, which sequentially include from the object side to the imaging surface along the optical axis: A first lens with negative optical power, having a convex object side surface and a concave image side surface; A second lens with positive optical power, having a convex object side surface and a concave image side surface; A third lens with negative optical power; A fourth lens with positive optical power, having a convex object side surface and a convex image side surface; A fifth lens with negative optical power, having a concave object side surface and a convex image side surface; A sixth lens with negative optical power; A seventh lens with positive optical power, having a convex object side surface and a convex image side surface; An eighth lens with positive optical power, having a convex object side surface and a convex image side surface; A ninth lens with negative optical power, having a concave object side surface and a concave image side surface; A tenth lens with positive optical power, having a convex image side surface; Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.5<TTL / f<7; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.03<f / f2<0.08.

[0005] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 2.1<TTL / IH<2.8; the focal length f10 of the tenth lens and the effective focal length f of the optical lens satisfy: 2.3<f10 / f<5.2.

[0006] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the real image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens and the maximum field of view FOV of the optical lens satisfy: 0.21<(IH / 2) / (f×tan(FOV / 2))<0.24; the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.4<f1 / f<-1.

[0007] Further preferably, the optical lens satisfies one or more of the following conditional expressions: 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: 6.5<IH / EPD<8; the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.3<IH / f<2.9.

[0008] Further preferably, the optical lens satisfies one or more of the following conditional expressions: 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: 10<180°×TTL / (IH / 2) / (FOV / 2)<13; the effective focal length f 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: 55°<f×FOV / IH<70°.

[0009] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the clear half aperture d1 of the object side surface 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: 0.2<d1 / (IH / 2) / tan(FOV / 2)<0.25; the real image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens and the radian value θ of the maximum half field of view of the optical lens satisfy: 0.89<(IH / 2) / (f×θ)<0.96.

[0010] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -10<f3 / f<-4; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.5<f4 / f<2.2; the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -21<f5 / f<-6; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -18<f6 / f<-7; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.3<f7 / f<1.9; the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1.2<f8 / f<2; the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: -1.2<f9 / f<-0.7.

[0011] Further preferably, a diaphragm is disposed between the fourth lens and the fifth lens; the eighth lens and the ninth lens form a cemented lens group with negative optical power; the optical lens satisfies one or more of the following conditional expressions: the combined focal length fb of the lenses located behind the diaphragm and the effective focal length f of the optical lens satisfy: 1.6<fb / f<2.8; the combined focal length f_cement of the eighth lens and the ninth lens and the effective focal length f of the optical lens satisfy: -4.5<f_cement / f<-2.2.

[0012] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.09<f1 / f2<-0.03; the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -4.3<f2 / f3<-2.2.

[0013] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.13<TTL / f<6.51; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.04<f / f2<0.07.

[0014] The optical lens provided by the present invention adopts ten lenses with specific optical power, 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 performance of the optical lens, and endow the lens with one or more advantages such as miniaturization, large field of view, large image plane, high pixel, and high imaging quality. Brief Description of the Drawings

[0015] 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.

[0016] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 3 This is an F-Theta distortion curve of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 4 This is an MTF curve of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 5 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0020] Figure 6 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0021] Figure 7 This is the F-Theta distortion curve of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 9 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0024] Figure 10 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0025] Figure 11 This is the F-Theta distortion curve of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 12 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0027] Figure 13 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0028] Figure 14 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0029] Figure 15 This is the F-Theta distortion curve of the optical lens in Embodiment 4 of the present invention.

[0030] Figure 16This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0031] Figure 17 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0032] Figure 18 This is a field curvature curve diagram of the optical lens in Embodiment 5 of the present invention.

[0033] Figure 19 This is the F-Theta distortion curve of the optical lens in Embodiment 5 of the present invention.

[0034] Figure 20 This is the MTF curve of the optical lens in Embodiment 5 of the present invention.

[0035] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The optical lens of this invention has ten lenses with optical power, arranged sequentially along the optical axis from the object side to the imaging plane: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens.

[0044] In some embodiments, the first lens may have negative optical power, with a convex object-side surface and a concave image-side surface. The second lens may have positive optical power, with a convex object-side surface and a concave image-side surface. The third lens may have negative optical power, with both its object-side and image-side surfaces being either concave or convex. The fourth lens may have positive optical power, with both its object-side and image-side surfaces being convex. The fifth lens may have negative optical power, with both its object-side and image-side surfaces being concave or convex. The sixth lens may have negative optical power, with both its object-side and image-side surfaces being either concave or convex. The seventh lens may have positive optical power, with both its object-side and image-side surfaces being convex. The eighth lens may have positive optical power, with both its object-side and image-side surfaces being convex. The ninth lens may have negative optical power, with both its object-side and image-side surfaces being concave. The tenth lens may have positive optical power, and its object side may be concave or convex, while its image side may be convex.

[0045] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the fourth lens and the fifth lens. It can be understood that the diaphragm is used to limit the amount of incoming light so as to change the brightness of imaging.

[0046] In some embodiments, the optical lens may further include an optical filter, which is disposed between the tenth lens and the imaging surface. 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.

[0047] In some embodiments, the eighth lens and the ninth lens may be cemented to form a cemented lens group with negative refractive power, 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 difficulty of the processing technology of the optical lens and increasing the assembly yield of the optical lens. In some embodiments, the combined focal length f_cement of the eighth lens and the ninth lens and the effective focal length f of the optical lens satisfy: -4.5<f_cement / f<-2.2. More specifically, -4.15<f_cement / f<-2.44.

[0048] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.5<TTL / f<7. Meeting the above range can effectively limit the length of the lens, which is beneficial to realizing the miniaturization of the optical lens. More specifically, 6.13<TTL / f<6.51.

[0049] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.03<f / f2<0.08. Meeting the above range is conducive to the smooth transition of light, facilitates the correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system. More specifically, 0.04<f / f2<0.07.

[0050] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.1<TTL / IH<2.8. Meeting the above range ensures that under the condition of the same total length of the lens, the lens has a larger image surface, can match an imaging chip of a larger size to achieve high-definition imaging, and better realize the balance between the small total length and the large image surface of the lens. More specifically, 2.37<TTL / IH<2.51.

[0051] In some embodiments, the focal length f10 of the tenth lens and the effective focal length f of the optical lens satisfy: 2.3<f10 / f<5.2. When the tenth lens meets the above conditions, it is helpful to reasonably collect light, ensure the amount of transmitted light, improve the relative illumination, and increase the brightness of the optical lens at the image surface. More specifically, 2.6<f10 / f<4.77.

[0052] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.21<(IH / 2) / (f×tan(FOV / 2))<0.24; the real image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field of view of the optical lens satisfy: 0.89<(IH / 2) / (f×θ)<0.96. Satisfying the above ranges can enable the lens to have a small distortion value and provide a high-definition imaging effect.

[0053] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.4<f1 / f<-1. Satisfying the above ranges, the first lens has an appropriate negative focal length, which is beneficial to expanding the field of view of the optical lens. More specifically, -1.24<f1 / f<-1.08.

[0054] In some embodiments, 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: 6.5<IH / EPD<8. Satisfying the above ranges can increase the width of the light beam entering the optical lens, so that the brightness of the optical lens at the image plane is improved and the occurrence of vignetting is avoided. More specifically, 7.07<IH / EPD<7.44.

[0055] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.3<IH / f<2.9. Satisfying the above ranges, the image height and focal length of the optical lens are controlled within a reasonable range, which helps the optical lens to have the characteristic of a large image plane and improves the imaging quality. More specifically, 2.52<IH / f<2.66.

[0056] 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: 10<180°×TTL / (IH / 2) / (FOV / 2)<13. Satisfying the above ranges can achieve a balance between the image height, the focal length and the total optical length, and improve the imaging quality of the optical lens. More specifically, 10.7<180°×TTL / (IH / 2) / (FOV / 2)<11.24.

[0057] In some embodiments, the effective focal length f of the optical lens, the real image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 55°<f×FOV / IH<70°. By satisfying the above conditional expression and reasonably limiting the relationship among the focal length, field of view angle and image height of the optical lens, it is beneficial to achieve the balance between the field of view 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. More specifically, 60.34°<f×FOV / IH<63.35°.

[0058] In some embodiments, the clear aperture half-diameter d1 of the object-side surface of the first lens, the real image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 0.2<d1 / (IH / 2) / tan(FOV / 2)<0.25. Satisfying the above range can ensure the balance among the size, field of view angle and image plane of the optical lens.

[0059] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -10<f3 / f<-4. Satisfying the above range is beneficial to the smooth transition of light rays, facilitates the correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system. More specifically, -8.6<f3 / f<-4.55.

[0060] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.5<f4 / f<2.2. Satisfying the above range is beneficial to the smooth transition of light rays, facilitates the correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system. More specifically, 1.66<f4 / f<2.

[0061] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -21<f5 / f<-6. Satisfying the above range enables full correction of various aberrations of the optical lens, which can improve the resolution and achieve high resolution. More specifically, -18.72<f5 / f<-7.41.

[0062] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -18<f6 / f<-7. Satisfying the above range enables full correction of various aberrations of the optical lens, which can improve the resolution and achieve high resolution. More specifically, -15.82<f6 / f<-8.28.

[0063] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.3<f7 / f<1.9. Meeting the above range facilitates smooth transition of light, while correcting the field curvature and distortion of the optical lens, and improving the imaging quality of the optical lens. More specifically, 1.49<f7 / f<1.67.

[0064] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1.2<f8 / f<2. Meeting the above range facilitates smooth transition of light, while correcting the field curvature and distortion of the optical lens, and improving the imaging quality of the optical lens. More specifically, 1.34<f8 / f<1.74.

[0065] In some embodiments, the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: -1.2<f9 / f<-0.7. Meeting the above range enables sufficient correction of various aberrations of the optical lens, which can improve the resolution and achieve high definition. More specifically, -1.07<f9 / f<-0.8.

[0066] In some embodiments, the combined focal length fb of the lenses located behind the diaphragm and the effective focal length f of the optical lens satisfy: 1.6<fb / f<2.8. Meeting the above range, by reasonably setting the focal length of the lens group behind the diaphragm, is beneficial to balancing various aberrations generated by the lens group in front of the diaphragm, and improving the overall imaging quality. More specifically, 1.78<fb / f<2.55.

[0067] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.09<f1 / f2<-0.03; the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -4.3<f2 / f3<-2.2. Meeting the above range facilitates smooth transition of light, improves the imaging quality of the optical lens, and ensures the stability of the optical system. More specifically, -0.08<f1 / f2<-0.04; -3.92<f2 / f3<-2.44.

[0068] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -5.5<f3 / f4<-2; the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.3<f4 / f5<-0.05. Meeting the above range can avoid excessive deflection of light and reduce the difficulty of aberration correction. More specifically, -5<f3 / f4<-2.28; -0.25<f4 / f5<-0.08.

[0069] 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: 0.7<R3 / f<0.9; the radius of curvature R4 of the image-side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.6<R4 / f<0.9; 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: 0.9<R3 / R4<1.2. By meeting the above ranges, the shapes of the object-side surface and the image-side surface of the second lens are controlled, the second lens has a meniscus profile, which can effectively converge and constrain the light beam, and can moderate the path of the light after passing through the second lens, which is beneficial to reducing the difficulty of aberration correction of subsequent lenses and improving imaging quality. More specifically, 0.73<R3 / f<0.86; 0.67<R4 / f<0.82; 0.98<R3 / R4<1.11.

[0070] 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: 1.5<R7 / f<5.3; 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: -6<R8 / f<-2.6; the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: -1.8<R7 / R8<-0.2; the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: -0.6<(R7+R8) / (R7-R8)<-0.3. By satisfying the above conditional expressions, the fourth lens is designed as a biconvex profile, which can reasonably increase the incident angle to meet the image height requirement of the optical lens, while reducing the sensitivity of the optical lens and improving assembly stability. More specifically, 1.7<R7 / f<4.83; -5.55<R8 / f<-2.88; -1.55<R7 / R8<-0.3; -0.54<(R7+R8) / (R7-R8)<-0.22.

[0071] 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: -1.6 < R9 / f < -0.9; 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: -1.8 < R10 / f < -1.1; 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: 0.7 < R9 / R10 < 1; 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: -0.15 < (R9-R10) / (R9+R10) < -0.06. When the above ranges are satisfied, the fifth lens has a meniscus shape, which can effectively converge and constrain the light beam, and can moderate the path of the light after passing through the fifth lens, which is beneficial to reducing the difficulty of aberration correction for subsequent lenses and improving the imaging quality. More specifically, -1.43 < R9 / f < -0.97; -1.67 < R10 / f < -1.27; 0.76 < R9 / R10 < 0.86; -0.14 < (R9-R10) / (R9+R10) < -0.07.

[0072] 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: -6.2 < R13 / R14 < -3; 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: 0.5 < (R13+R14) / (R13-R14) < 0.8. When the above ranges are satisfied, the seventh lens adopts a biconvex lens, which is beneficial to correcting the field curvature and distortion of the optical lens while converging light, and improving the imaging quality of the optical lens. More specifically, -5.66 < R13 / R14 < -3.49; 0.55 < (R13+R14) / (R13-R14) < 0.71.

[0073] In some embodiments, the optical lens satisfies the following conditional expressions: 5mm<f<6mm; 1.8mm<EPD<2.1mm; 30mm<TTL<38mm; 2.6<Fno<3; 15°<CRA<26°; 4mm<BFL<7.5mm; 150°<FOV<170°; 13mm<IH<15mm. In the above conditional expressions, f denotes the effective focal length of the optical lens, EPD denotes the entrance pupil diameter of the optical lens, TTL denotes the total optical length of the optical lens, Fno denotes the aperture value of the optical lens, CRA denotes the chief ray incident angle at the maximum image height of the optical lens, BFL denotes the back focal length of the optical lens, FOV denotes the maximum field of view angle of the optical lens, and IH denotes the real image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above ranges, the optical lens has at least one or more advantages such as miniaturization, large image plane, large aperture, and large field of view angle. More specifically, 5.33mm<f<5.51mm; 1.9mm<EPD<1.97mm; 33.77mm<TTL<35.25mm; 2.79<Fno<2.81; 17.13°<CRA<24.5°; 4.09mm<BFL<7.38mm; 160.1°<FOV<160.3°; 13.9mm<IH<14.42mm.

[0074] In some implementations, the material of the lenses in the optical lens provided by the present invention may be glass or plastic. When the material of the lenses is plastic, the production cost can be effectively reduced. In addition, when the material of the lenses is glass, the geometric chromatic aberration of the optical system can be effectively corrected by utilizing the low dispersion characteristic of glass itself. The optical lens provided by the present invention may adopt an all-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve imaging quality.

[0075] In some implementations, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens may be spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the second lens, the fifth lens, the seventh lens, and the tenth lens of the present invention adopt aspherical lenses; the first lens, the third lens, the fourth lens, the sixth lens, the eighth lens, and the ninth lens adopt spherical lenses.

[0076] In various embodiments of the present invention, when the lenses adopt aspherical lenses, the shape of each aspherical surface of the optical lens satisfies the following equation: ; 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.

[0077] 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.

[0078] Example 1

[0079] Please see Figure 1 The diagram shown is a structural schematic of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens includes, in sequence along the optical axis from the object side to the imaging plane: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, and a filter G1.

[0080] Among them, 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 positive optical power, its object side S3 is convex, and its image side S4 is concave. The third lens L3 has negative optical power, its object side S5 is concave, 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 S8 is convex. The fifth lens L5 has negative optical power, its object side S9 is concave, and its image side S10 is convex. The sixth lens L6 has negative optical power, its object side S11 is concave, and its image side S12 is convex. The seventh lens L7 has positive optical power, its object side S13 is convex, and its image side S14 is convex. The eighth lens L8 has positive optical power, its object side S15 is convex, and its image side is convex. The ninth lens L9 has negative optical power, its object side is concave, and its image side S17 is concave. The eighth lens L8 and the ninth lens L9 form a cemented lens group with negative optical power, that is, the cemented surface of the image side of the eighth lens L8 and the object side of the ninth lens L9 is S16. The tenth lens L10 has positive optical power, its object side S18 is convex, and its image side S19 is convex. The object-side surface S20 and the image-side surface S21 of the filter G1 are both planar. The imaging plane S22 is a plane.

[0081] The first, third, fourth, sixth, eighth, and ninth lenses are glass spherical lenses, while the second, fifth, seventh, and tenth lenses are glass aspherical lenses.

[0082] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0083] 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.

[0084] Table 1-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and MTF curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0085] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.06 mm, indicating that the optical lens can effectively correct the field curvature.

[0086] Figure 3 The F-Theta distortion curve of Example 1 is shown, which represents the F-Theta distortion of light at different image heights on the imaging plane. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -6% to 0, indicating that the optical lens can correct distortion well.

[0087] Figure 4The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.18 throughout the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0088] Example 2

[0089] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the image side surface S12 of the sixth lens L6 is concave; the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0090] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0091] 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.

[0092] Table 2-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and MTF curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0093] from Figure 6 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.02mm to 0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0094] from Figure 7 As can be seen, the F-Theta distortion of the optical lens is controlled within -8% to 0, indicating that the optical lens can correct distortion well.

[0095] from Figure 8 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0096] Example 3

[0097] Please see Figure 9 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the image side surface S6 of the third lens L3 is concave; the image side surface S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0098] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0099] 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.

[0100] Table 3-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and MTF curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0101] from Figure 10 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.07mm, indicating that the optical lens can effectively correct the field curvature.

[0102] from Figure 11 As can be seen, the F-Theta distortion of the optical lens is controlled within -10% to 0, indicating that the optical lens can correct distortion well.

[0103] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0104] Example 4

[0105] Please see Figure 13The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The optical lens in this embodiment is generally the same as that in Embodiment 1. The main difference is that the object side S5 of the third lens L3 is a convex surface; the image side S6 of the third lens L3 is a concave surface; the image side S12 of the sixth lens L6 is a concave surface; and the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0106] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0107] 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.

[0108] Table 4-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and MTF curve of the optical lens 400 are respectively as follows: Figure 14 , Figure 15 , Figure 16 As shown.

[0109] from Figure 14 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0110] from Figure 15 As can be seen, the F-Theta distortion of the optical lens is controlled within -10% to 1%, indicating that the optical lens can correct distortion well.

[0111] from Figure 16 As can be seen, the MTF value of this embodiment is above 0.25 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0112] Example 5

[0113] Please see Figure 17 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The optical lens in this embodiment is generally the same as that in Embodiment 1. The main difference is that the object side S11 of the sixth lens L6 is a convex surface; the image side S12 of the sixth lens L6 is a concave surface; the object side S18 of the tenth lens is a concave surface; and the optical parameters such as the radius of curvature, aspherical coefficient, and 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 In this embodiment, the field curvature curve, F-Theta distortion curve, and MTF curve of the optical lens 500 are respectively as follows: Figure 18 , Figure 19 , Figure 20 As shown.

[0117] from Figure 18 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.02mm to 0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0118] from Figure 19 As can be seen, the F-Theta distortion of the optical lens is controlled within -6% to 0, indicating that the optical lens can correct distortion well.

[0119] from Figure 20 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0120] Please refer to Table 6 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, and the values ​​corresponding to each conditional expression in each embodiment.

[0121] Table 6 In summary, the optical lens provided by the present invention uses ten 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 field of view, large image plane, high pixel count, and high imaging quality.

[0122] 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.

[0123] 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 ten lenses with optical power, characterized in that, Along the optical axis from the object side to the image plane, the optical system sequentially comprises: a first lens with negative optical power, whose object-side surface is convex and image-side surface is concave; a second lens with positive optical power, whose object-side surface is convex and image-side surface is concave; a third lens with negative optical power; a fourth lens with positive optical power, whose object-side surface is convex and image-side surface is convex; a fifth lens with negative optical power, whose object-side surface is concave and image-side surface is convex; a sixth lens with negative optical power; a seventh lens with positive optical power, whose object-side surface is convex and image-side surface is convex; an eighth lens with positive optical power, whose object-side surface is convex and image-side surface is convex; a ninth lens with negative optical power, whose object-side surface is concave and image-side surface is concave; a tenth lens with positive optical power, whose image-side surface is convex; wherein the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.5<TTL / f<7; and the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.03<f / f2<0.

08.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 2.1<TTL / IH<2.8; and the focal length f10 of the tenth lens and the effective focal length f of the optical lens satisfy: 2.3<f10 / f<5.

2.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the real image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens and the maximum field of view FOV of the optical lens satisfy: 0.21<(IH / 2) / (f×tan(FOV / 2))<0.24; and the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.4<f1 / f<-1.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: 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: 6.5<IH / EPD<8; and the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.3<IH / f<2.

9.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: 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: 10<180°×TTL / (IH / 2) / (FOV / 2)<13; and the effective focal length f 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: 55°<f×FOV / IH<70°.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the light-passing 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: 0.2<d1 / (IH / 2) / tan(FOV / 2)<0.25; the real image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field of view of the optical lens satisfy: 0.89<(IH / 2) / (f×θ)<0.

96.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -10<f3 / f<-4; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.5<f4 / f<2.2; the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -21<f5 / f<-6; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -18<f6 / f<-7; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.3<f7 / f<1.9; the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1.2<f8 / f<2; the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: -1.2<f9 / f<-0.

7.

8. The optical lens according to claim 1, characterized in that, A diaphragm is arranged between the fourth lens and the fifth lens; the eighth lens and the ninth lens form a cemented lens group with negative optical power; the optical lens satisfies one or more of the following conditional expressions: the combined focal length fb of the lenses located behind the diaphragm and the effective focal length f of the optical lens satisfy: 1.6<fb / f<2.8; the combined focal length f_cement of the eighth lens and the ninth lens and the effective focal length f of the optical lens satisfy: -4.5<f_cement / f<-2.

2.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.09<f1 / f2<-0.03; the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -4.3<f2 / f3<-2.

2.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: the total optical track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.13<TTL / f<6.51; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.04<f / f2<0.07.

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