Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power, wherein the object side surface and the image side surface of the second lens are both concave surfaces; a third lens with positive optical power, wherein the object side surface and the image side surface of the third lens are both convex surfaces; a fourth lens with positive optical power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens with positive optical power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; a sixth lens with negative optical power, wherein the object side surface and the image side surface of the sixth lens are both concave surfaces; and a seventh lens with positive optical power, wherein the object side surface and the image side surface of the seventh lens are both convex surfaces. The optical lens provided by the application has one or more advantages of a large aperture, a large field of view, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

Description

Technical Field

[0001] This invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Technology

[0002] As people's demands for driving experience continue to increase, automotive optical lenses are being used more and more in intelligent driving, and the status of automotive optical lenses in the automotive industry is constantly rising.

[0003] Advanced Driver Assistance Systems (ADAS) play a crucial role in intelligent driving. They use various cameras and sensors to collect environmental information to ensure driver safety. For example, typically, a surround-view camera is installed in each of the four directions (front, rear, left, and right) of a vehicle. By stitching together the images captured by these four cameras, a 360-degree panoramic view of the vehicle's surroundings can be provided to the driver. With the rapid development of ADAS, the requirements for surround-view cameras are also increasing. Therefore, it is necessary to develop an optical lens with high imaging quality. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0005] The technical solution adopted in this invention is as follows:

[0006] An optical lens comprises seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] The first lens with negative optical power has a convex object side and a concave image side.

[0008] A second lens with negative optical power has concave object-side and image-side surfaces;

[0009] A third lens with positive optical power has convex surfaces on both its object side and image side.

[0010] The fourth lens with positive optical power has a concave object side and a convex image side.

[0011] The fifth lens with positive optical power has a concave object side and a convex image side.

[0012] The sixth lens has negative optical power, and both its object-side and image-side surfaces are concave.

[0013] The seventh lens with positive optical power has convex surfaces on both its object side and image side.

[0014] The radius of curvature R9 of the object side of the fifth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: -1<(R9+R12) / (R9-R12)<0.

[0015] Further preferably, the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: FOV×f / IH>65°.

[0016] Further preferably, 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: R7 / f<-5.

[0017] Further preferably, 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: -20<R9 / f<-4.

[0018] Further preferably, the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: R12 / f>5.

[0019] Further preferably, 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: R7 / R8>4.

[0020] Further preferably, the radius of curvature R12 of the image side surface of the sixth lens and the radius of curvature R13 of the object side surface of the seventh lens satisfy: R12 / R13>2.

[0021] Further preferably, 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<(R7-R8) / (R7+R8)<1.

[0022] Further preferably, 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<(R9-R10) / (R9+R10)<1.

[0023] Further preferably, the sagittal height Sag9 of the object side clear aperture radius of the fifth lens satisfies: -0.2mm<Sag9<0; the spacing CT23 between the second lens and the third lens on the optical axis, the spacing CT34 between the third lens and the fourth lens on the optical axis, and the spacing CT45 between the fourth lens and the fifth lens on the optical axis satisfy: 3.5<(CT23+CT34) / CT45<13.

[0024] The optical lens provided by the present invention adopts seven lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberrations, improve the imaging quality of the optical lens, and enable the lens to have one or more advantages such as a large aperture, a large field of view, and high imaging quality. Description of the Drawings

[0025] 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:

[0026] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0027] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 This is the F-θ distortion curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 This is the MTF curve of the optical lens in Embodiment 1 of the present invention at an operating temperature of 20°C.

[0030] Figure 5 This is the MTF curve of the optical lens in Embodiment 1 of the present invention at an operating temperature of -40℃.

[0031] Figure 6 This is the MTF curve of the optical lens in Embodiment 1 of the present invention at an operating temperature of 85°C.

[0032] Figure 7 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0033] Figure 8 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0034] Figure 9 This is a relative illumination curve of the optical lens in Embodiment 1 of the present invention.

[0035] Figure 10 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0036] Figure 11 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 12 This is the F-θ distortion curve of the optical lens in Embodiment 2 of the present invention.

[0038] Figure 13 This is the MTF curve of the optical lens in Embodiment 2 of the present invention at an operating temperature of 20°C.

[0039] Figure 14 This is the MTF curve of the optical lens in Embodiment 2 of the present invention at an operating temperature of -40℃.

[0040] Figure 15This is the MTF curve of the optical lens in Embodiment 2 of the present invention at an operating temperature of 85°C.

[0041] Figure 16 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0042] Figure 17 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0043] Figure 18 This is a relative illumination curve of the optical lens in Embodiment 2 of the present invention.

[0044] Figure 19 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0045] Figure 20 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0046] Figure 21 This is the F-θ distortion curve of the optical lens in Embodiment 3 of the present invention.

[0047] Figure 22 This is the MTF curve of the optical lens in Embodiment 3 of the present invention at an operating temperature of 20°C.

[0048] Figure 23 This is the MTF curve of the optical lens in Embodiment 3 of the present invention at an operating temperature of -40℃.

[0049] Figure 24 This is the MTF curve of the optical lens in Embodiment 3 of the present invention at an operating temperature of 85°C.

[0050] Figure 25 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0051] Figure 26 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0052] Figure 27 This is a relative illumination curve of the optical lens in Embodiment 3 of the present invention.

[0053] Figure 28 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0054] Figure 29 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0055] Figure 30 This is the F-θ distortion curve of the optical lens in Embodiment 4 of the present invention.

[0056] Figure 31 This is the MTF curve of the optical lens in Embodiment 4 of the present invention at an operating temperature of 20°C.

[0057] Figure 32 This is the MTF curve of the optical lens in Embodiment 4 of the present invention at an operating temperature of -40℃.

[0058] Figure 33 This is the MTF curve of the optical lens in Embodiment 4 of the present invention at an operating temperature of 85°C.

[0059] Figure 34 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0060] Figure 35 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0061] Figure 36 This is a relative illumination curve of the optical lens in Embodiment 4 of the present invention.

[0062] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In this article, "near the optical axis" refers to the region near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least near the optical axis; if the lens surface is concave and its location is not defined, it means that the lens surface is concave at least near the optical axis. 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] The optical lens provided in this embodiment of the invention consists of seven lenses, which are arranged sequentially along the optical axis from the object side to the imaging plane as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0071] In some embodiments, 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 both its object-side and image-side surfaces being concave. The third lens may have positive optical power, with both its object-side and image-side surfaces being convex. The fourth lens may have positive optical power, with its object-side surface being concave and its image-side surface being convex. The fifth lens may have positive optical power, with its object-side surface being concave and its image-side surface being convex. The sixth lens may have negative optical power, with both its object-side and image-side surfaces being concave. The seventh lens may have positive optical power, with both its object-side and image-side surfaces being convex.

[0072] In some embodiments, the optical lens may also include an aperture stop, which may be located between the fourth and fifth lenses. It is understood that the aperture stop can be used to limit the amount of light entering the lens, thereby changing the brightness of the image. Furthermore, when the aperture stop is located between the fourth and fifth lenses, it can rationally allocate the functions of the first to seventh lenses. For example, the first, second, third, and fourth lenses can be used to receive light to a greater extent, while the fifth to seventh lenses can be used to correct aberrations, which is beneficial for balancing the overall structure of the optical system. In addition, when the aperture stop is located between the fourth and fifth lenses, it facilitates the correction of aperture aberrations.

[0073] In some embodiments, the optical lens may further include a filter and a protective glass, which are sequentially disposed between the seventh lens and the imaging plane along the optical axis. The filter is used to filter out interfering light, preventing it from reaching the imaging plane of the optical lens and affecting normal imaging. The protective glass protects the optical lens, preventing damage to the image sensor, and improves the lens's shock and scratch resistance, while having almost no impact on the image quality.

[0074] In some embodiments, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: -1 < (R9 + R12) / (R9 - R12) < 0. Satisfying this range improves the imaging quality of the optical lens, enabling it to maintain good imaging quality in both high and low temperature environments. Preferably, -1 < (R9 + R12) / (R9 - R12) < -0.2.

[0075] In some embodiments, the maximum field of view (FOV), the effective focal length (f), and the true image height (IH) corresponding to the maximum field of view of the optical lens satisfy the condition: FOV×f / IH > 65°. Meeting this range, by reasonably limiting the maximum field of view, the effective focal length, and the true image height corresponding to the maximum field of view of the optical lens, helps to balance the relationship between a large field of view and a large image plane. Preferably, 69° <FOV×f / IH<81°

[0076] In some embodiments, the radius of curvature R7 of the fourth lens object side surface and the effective focal length f of the optical lens satisfy the condition: R7 / f < -5. By satisfying this range and reasonably limiting the radius of curvature of the fourth lens object side surface, field curvature can be optimized, the difficulty of lens aberration optimization can be reduced, and the lens imaging quality can be improved. Preferably, R7 / f < -10.

[0077] 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: -20 < R9 / f < -4. Meeting the above range can effectively reduce aberrations and the difficulty of distortion correction for subsequent lenses, and improve the imaging quality. Preferably, -14.1 < R9 / f < -6.2.

[0078] In some embodiments, the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: R12 / f > 5. Meeting the above range can reduce high-order aberrations and achieve high-quality imaging. Preferably, R12 / f > 14.

[0079] In some embodiments, 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: R7 / R8 > 4. Meeting the above range can effectively control the fourth lens to have an appropriate surface shape by reasonably limiting the radii of curvature of the object side surface and the image side surface of the fourth lens, which is beneficial to correcting the spherical aberration of the optical lens and improving the imaging quality of the optical lens. Preferably, 5 < R7 / R8 < 71.

[0080] In some embodiments, the radius of curvature R12 of the image side surface of the sixth lens and the radius of curvature R13 of the object side surface of the seventh lens satisfy: R12 / R13 > 2. Meeting the above range can control the image side surface of the sixth lens and the object side surface of the seventh lens to have appropriate surface shapes by reasonably limiting the radius of curvature of the image side surface of the sixth lens and the radius of curvature of the object side surface of the seventh lens, effectively control the smoothness of the light path, reduce aberrations and field curvature, and improve the imaging quality of the optical lens. Preferably, 3 < R12 / R13 < 92.

[0081] In some embodiments, 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 < (R7 - R8) / (R7 + R8) < 1. Meeting the above range can effectively reduce the distortion generated by the front-end lens by reasonably limiting the shapes of the object side surface and the image side surface of the fourth lens, reduce the requirements for distortion correction of subsequent lenses, and improve the imaging quality of the optical lens. Preferably, 0.6 < (R7 - R8) / (R7 + R8) < 1.

[0082] In some embodiments, 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 < (R9 - R10) / (R9 + R10) < 1. Meeting the above range can effectively control the light path of the marginal field of view by reasonably limiting the shapes of the object side surface and the image side surface of the fifth lens, and effectively improve the imaging quality of the marginal field of view. Preferably, 0.5 < (R9 - R10) / (R9 + R10) < 0.8.

[0083] In some embodiments, the sagittal height Sag9 of the clear aperture semi-diameter on the object side of the fifth lens satisfies: -0.2 mm < Sag9 < 0; by satisfying the above range and reasonably limiting the sagittal height of the clear aperture semi-diameter on the object side of the fifth lens, the light path trend of the marginal field of view can be effectively controlled, and the detailed information of the central field of view of the optical lens can be highlighted. Preferably, -0.1 mm < Sag9 < 0.

[0084] In some embodiments, the distance CT23 between the second lens and the third lens on the optical axis, the distance CT34 between the third lens and the fourth lens on the optical axis, and the distance CT45 between the fourth lens and the fifth lens on the optical axis satisfy: 3.5 < (CT23 + CT34) / CT45 < 13. By satisfying the above range and reasonably limiting the distance between the second lens and the third lens on the optical axis, the distance between the third lens and the fourth lens on the optical axis, and the distance between the fourth lens and the fifth lens on the optical axis, the distance between each lens can be reasonably controlled within a reasonable range, so that each lens is reasonably arranged in the optical system, reducing the assembly difficulty and improving the yield. Preferably, 3.7 < (CT23 + CT34) / CT45 < 12.2.

[0085] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 10 mm < TTL / f < 13 mm. By satisfying the above range and controlling the total optical length and the effective focal length of the optical lens within a reasonable range, there is enough space to adjust the lens structure and optimize the imaging effect. Preferably, 11.2 mm < TTL / f < 12.3 mm.

[0086] In some embodiments, the maximum field of view FOV of the optical lens and the f-number FNO of the optical lens satisfy: FOV / FNO > 100°. By satisfying the above range and reasonably limiting the field of view and the f-number of the optical lens, it is beneficial to expand the field of view of the optical lens and increase the aperture of the optical lens, which is beneficial for the optical lens to obtain more scene information and meet the requirements of large-range detection. The realization of the large-aperture characteristic is beneficial to improving the problem that the relative brightness of the marginal field of view decreases rapidly, and thus is also beneficial to obtaining more scene information. Preferably, FOV / FNO > 101°.

[0087] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: BFL / f > 2.5. By satisfying the above range and reasonably limiting the back focal length of the optical lens, the design and assembly difficulty of the optical lens can be reduced and the yield can be improved. Preferably, BFL / f > 2.6.

[0088] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -4.2 < f1 / f < -2.8. Meeting the above range, by reasonably defining the proportion of the focal length of the first lens, it helps to obtain light at a large angle, allows as much light as possible to enter the lens, and increases the field angle of the optical lens. Preferably, -3.5 < f1 / f < -3.0.

[0089] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -3.3 < f2 / f < -2.4. Meeting the above range, by reasonably defining the proportion of the focal length of the second lens, it can share the negative optical power of the front lens and reduce the difficulty of aberration correction for the subsequent lenses. Preferably, -3.1 < f2 / f < -2.7.

[0090] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 5.2 < f3 / f < 6.8. Meeting the above range, by appropriately defining the proportion of the focal length of the third lens, it can slow down the light deflection and reduce the difficulty of aberration correction for the subsequent lenses. Preferably, 5.6 < f3 / f < 6.5.

[0091] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.1 < f4 / f < 3.6. Meeting the above range, by reasonably defining the proportion of the focal length of the fourth lens, it can further converge the light and make the light trend stable. Preferably, 2.4 < f4 / f < 3.4.

[0092] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.1 < f5 / f < 4.9. Meeting the above range, by reasonably defining the proportion of the focal length of the fifth lens, it can balance the lens aberration and improve the imaging quality. Preferably, 3.4 < f5 / f < 4.5.

[0093] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2.2 < f6 / f < -1.7. Meeting the above range, by reasonably defining the proportion of the focal length of the sixth lens, it can increase the imaging area and improve the imaging quality. Preferably, -2.1 < f6 / f < -1.9.

[0094] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 2.1 < f7 / f < 2.9. Meeting the above range, by reasonably defining the proportion of the focal length of the seventh lens, it can optimize the spherical aberration and improve the imaging quality. Preferably, 2.4 < f7 / f < 2.6.

[0095] In some embodiments, the fifth lens and the sixth lens form a cemented lens group with a negative optical power, and the image side of the fifth lens and the object side of the sixth lens are cemented surfaces. Meeting the above ranges 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 reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens. In some embodiments, the combined focal length f56 of the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: -4.9 < f56 / f < -2.5. Preferably, -4.5 < f56 / f < -3.1.

[0096] In some embodiments, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens, and the seventh lens satisfy: 0.1 < f1234 / f567 < 0.7. Meeting the above ranges can reasonably allocate the proportion of the optical power of each lens of the optical lens by reasonably defining the focal length ratio of the front lens group and the rear lens group, and improve the structural stability of the optical lens. Preferably, 0.2 < f1234 / f567 < 0.5.

[0097] In some embodiments, the radius of curvature R13 of the object side of the seventh lens and the effective focal length f of the optical lens satisfy: 3.2 < R13 / f < 6.2; the radius of curvature R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: -2.4 < R14 / f < -1.7. Meeting the above ranges can help increase the image plane and improve the imaging quality of the optical lens by reasonably defining the effective focal length of the optical lens and the shapes of the object side and the image side of the seventh lens. Preferably, 3.8 < R13 / f < 5.7, -2.2 < R14 / f < -1.8.

[0098] In some embodiments, the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R10 of the image side of the fifth lens satisfy: 3 < R9 / R10 < 9. Meeting the above ranges can help define a suitable surface shape of the fifth lens by reasonably defining the radii of curvature of the object side and the image side of the fifth lens, effectively correct the field curvature and aberration, and improve the imaging quality of the optical lens. Preferably, 3.5 < R9 / R10 < 8.8.

[0099] In some embodiments, the clear aperture radius d1 of the object side surface of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: -0.9 < d1 / (IH / 2) / tan(FOV / 2) < -0.3. Meeting the above range can reasonably arrange the overall geometry of the optical lens by reasonably limiting the front aperture diameter, true image height, and maximum field angle of the optical lens, and improve its structural stability. Preferably, -0.7 < d1 / (IH / 2) / tan(FOV / 2) < -0.5.

[0100] In some embodiments, the total optical length TTL of the optical lens and the sum of the central thicknesses ∑CT of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens satisfy: 1.6 < TTL / ∑CT < 2.4. Meeting the above range helps the optical lens achieve high pixel characteristics and improve the imaging quality of the optical lens. Preferably, 1.8 < TTL / ∑CT < 2.2.

[0101] In some embodiments, the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 1 < CT3 / CT4 < 2.4. Meeting the above range and reasonably configuring the central thicknesses of each lens is beneficial to meeting the requirements of the processability and manufacturability of the optical lens. Preferably, 1 < CT3 / CT4 < 2.3.

[0102] In some embodiments, the optical lens satisfies the following conditional expressions: 1.3 mm < f < 1.7 mm; FOV > 200°; 0.6 mm < EPD < 0.9 mm; 15 mm < TTL < 20 mm; 1.7 < FNO < 2.1; 3.9 mm < IH < 4.3 mm; 11° < CRA < 15°; BFL > 3.7 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field angle 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 aperture value of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, CRA represents the chief ray incident angle at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Meeting the above range, the optical lens has at least one or more advantages such as a large target surface, a large aperture, and a large field angle.

[0103] 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 the aberrations of the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first, fourth, fifth, and sixth lenses of this invention are spherical lenses, while the second, third, and seventh lenses are aspherical lenses.

[0104] 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:

[0105]

[0106] 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.

[0107] 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.

[0108] Example 1

[0109] 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, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0110] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0111] The second lens L2 has negative optical power, and its object side S3 and image side S4 are both concave.

[0112] The third lens L3 has positive optical power, and its object side S5 and image side S6 are both convex surfaces.

[0113] The fourth lens L4 has positive optical power, its object side S7 is concave, and its image side S8 is convex.

[0114] The fifth lens L5 has positive optical power, its object side S9 is concave, and its image side S10 is convex.

[0115] The sixth lens L6 has negative optical power, and both its object-side surface S10 and image-side surface S11 are concave.

[0116] The fifth lens L5 and the sixth lens L6 form a cemented lens group with negative optical power, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10.

[0117] The seventh lens L7 has positive optical power, and both its object side surface S12 and image side surface S13 are convex.

[0118] The object-side surface S14 and the image-side surface S15 of filter G1 are both planar.

[0119] The object side S16 and the image side S17 of the protective glass G2 are both flat.

[0120] The imaging plane S18 is a plane.

[0121] The first lens L1, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses, while the second lens L2, the third lens L3, and the seventh lens L7 are glass aspherical lenses.

[0122] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0123] Table 1-1

[0124]

[0125]

[0126] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0127] Table 1-2

[0128] Face number K B C D E F S3 6.15E+01 -5.31E-03 1.84E-04 3.31E-05 -1.06E-05 1.10E-06 S4 1.62E-01 -1.36E-02 8.13E-03 -8.30E-03 3.25E-03 -5.63E-04 S5 -1.32E+02 4.58E-03 5.19E-04 -1.33E-03 6.90E-04 -1.46E-04 S6 6.45E+01 1.04E-02 -3.05E-03 3.59E-03 -1.41E-03 2.25E-04 S12 1.87E+00 -7.59E-03 1.21E-03 -6.71E-04 1.78E-04 -2.70E-05 S13 8.53E-01 7.01E-03 1.10E-04 9.87E-05 2.54E-05 -5.31E-06

[0129] In this embodiment, the field curvature curve, F-θ distortion curve, MTF curve at operating temperatures of 20°C, -40°C, and 85°C, axial aberration curve, transverse chromatic aberration curve, and relative illumination curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown.

[0130] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light of different wavelengths 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 -0.04 mm to 0.04 mm, indicating that the optical lens can effectively correct the field curvature.

[0131] Figure 3 The F-θ distortion curve of Example 1 is shown, which represents the F-θ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-θ distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-θ distortion of the optical lens is controlled within -25% to 0, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image.

[0132] Figure 4 The diagram shows the MTF (Modulation Transfer Function) curve of Example 1 at an operating temperature of 20°C. It 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 the MTF value. As can be seen from the figure, the MTF value of this example is above 0.4 across 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 image quality and good detail resolution even at room temperature.

[0133] Figure 5 The diagram shows the MTF (Modulation Transfer Function) curve of Example 1 at an operating temperature of -40°C. It 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 the MTF value. As can be seen from the figure, the MTF value of this example is above 0.4 across 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, demonstrating good image quality and detail resolution even at low temperatures.

[0134] Figure 6The diagram shows the MTF (Modulation Transfer Function) curve of Example 1 at an operating temperature of 85°C. It 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 the MTF value. As can be seen from the figure, the MTF value of this example is above 0.3 across 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, demonstrating good image quality and detail resolution even at high temperatures.

[0135] Figure 7 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within ±0.03 mm, indicating that the optical lens can effectively correct axial aberration.

[0136] Figure 8 The diagram shows the transverse chromatic aberration curves for Example 1, representing the chromatic aberration of each wavelength relative to the center wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within 0–6 μm, indicating that the optical lens can excellently correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0137] Figure 9 The relative illumination curve of Example 1 is shown, which represents the relative illumination value at different field-of-view angles on the imaging plane. The horizontal axis represents the half-field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 85% at the maximum half-field angle, indicating that the optical lens has good relative illumination.

[0138] Example 2

[0139] Please see Figure 10 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main 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.

[0140] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0141] Table 2-1

[0142]

[0143] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0144] Table 2-2

[0145] Face number K B C D E F S3 -1.50E+02 -1.45E-02 -2.43E-04 2.29E-04 -1.05E-05 -1.43E-06 S4 1.66E-01 -2.54E-02 3.16E-03 -5.10E-03 1.98E-03 -4.12E-04 S5 5.85E+00 1.04E-02 4.51E-04 -1.47E-03 6.75E-04 -1.79E-04 S6 1.50E+02 1.77E-02 -2.09E-03 3.05E-03 -1.30E-03 1.63E-04 S12 5.27E+00 -6.14E-03 1.64E-03 -7.73E-04 2.01E-04 -1.89E-05 S13 8.23E-01 7.65E-03 -4.67E-04 7.16E-04 -1.60E-04 2.11E-05

[0146] In this embodiment, the field curvature curve, F-θ distortion curve, MTF curve, axial aberration curve, transverse chromatic aberration curve, and relative illumination curve of the optical lens 200 are respectively as follows: Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 and Figure 18 As shown. From Figure 11 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.04mm, indicating that the optical lens 200 can effectively correct field curvature. From Figure 12 As can be seen, the F-θ distortion of the 200mm optical lens is controlled within -30% to 0%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image. From Figure 13 As can be seen, in this embodiment, the MTF value is above 0.4 across the entire field of view at an operating temperature of 20℃. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at room temperature. Figure 14 As can be seen, in this embodiment, the MTF value is above 0.3 across the entire field of view at an operating temperature of -40℃. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at low temperatures. Figure 15 As can be seen, in this embodiment, the MTF value at an operating temperature of 85℃ is above 0.3 across the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at higher temperatures. Figure 16 As can be seen, the axial aberration offset in this embodiment is controlled within -0.03mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration. From Figure 17 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 4μm, indicating that the optical lens can excellently correct chromatic aberration at the edges of the field of view and the second-order spectrum of the entire image plane. From Figure 18 As can be seen, the relative illumination value of the optical lens is still greater than 85% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0147] Example 3

[0148] Please see Figure 19 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main 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.

[0149] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0150] Table 3-1

[0151]

[0152]

[0153] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0154] Table 3-2

[0155] Face number K B C D E F S3 5.54E+01 -8.90E-03 5.01E-04 8.75E-05 -1.39E-05 6.63E-07 S4 7.62E-02 -1.13E-02 7.79E-03 -7.40E-03 3.07E-03 -5.34E-04 S5 -1.41E+02 1.34E-02 2.91E-03 -1.46E-03 6.95E-04 -1.46E-04 S6 2.34E+01 1.91E-02 -1.88E-06 3.35E-03 -1.24E-03 1.96E-04 S12 1.00E+00 -7.76E-03 6.04E-04 -5.39E-04 2.10E-04 -3.79E-05 S13 5.24E-01 8.55E-03 3.96E-04 8.62E-05 2.74E-05 1.47E-06

[0156] In this embodiment, the field curvature curve, F-θ distortion curve, MTF curve, axial aberration curve, transverse chromatic aberration curve, and relative illumination curve of the optical lens 300 at operating temperatures of 20°C, -40°C, and 85°C are respectively as follows: Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 , Figure 25 , Figure 26 and Figure 27 As shown. From Figure 20 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.02mm, indicating that the optical lens 300 can effectively correct field curvature. From Figure 21 As can be seen, the F-θ distortion of the 300mm optical lens is controlled within -20% to 0%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image. From Figure 22 As can be seen, in this embodiment, the MTF value is above 0.4 across the entire field of view at an operating temperature of 20℃. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at room temperature. Figure 23 As can be seen, in this embodiment, the MTF value is above 0.4 across the entire field of view at an operating temperature of -40℃. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at low temperatures. Figure 24 As can be seen, in this embodiment, the MTF value at an operating temperature of 85℃ is above 0.3 across the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at higher temperatures. Figure 25 As can be seen, the axial aberration offset in this embodiment is controlled within -0.01mm to 0.01mm, indicating that the optical lens can effectively correct axial aberration. Figure 26 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within 0–4 μm, indicating that the optical lens can excellently correct chromatic aberration at the edges of the field of view and the second-order spectrum of the entire image plane. From Figure 27 As can be seen, the relative illumination value of the optical lens is still greater than 75% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0157] Example 4

[0158] Please see Figure 28 The figure shown is a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main 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.

[0159] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0160] Table 4-1

[0161]

[0162]

[0163] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0164] Table 4-2

[0165] Face number K B C D E F S3 1.43E+02 -1.13E-02 8.86E-04 1.27E-04 -3.27E-05 1.91E-06 S4 1.30E-01 -1.71E-02 8.61E-03 -8.21E-03 3.27E-03 -5.10E-04 S5 -1.50E+02 1.12E-02 1.38E-03 -1.45E-03 7.14E-04 -1.23E-04 S6 6.50E+01 1.65E-02 -1.76E-03 3.20E-03 -1.06E-03 1.64E-04 S12 2.73E+00 -7.66E-03 6.76E-04 -5.50E-04 1.56E-04 -2.15E-05 S13 5.60E-01 6.60E-03 3.71E-04 -3.67E-05 2.95E-05 -2.07E-06

[0166] In this embodiment, the field curvature curve, F-θ distortion curve, MTF curve, axial aberration curve, transverse chromatic aberration curve, and relative illumination curve of the optical lens 400 are respectively as follows: Figure 29 , Figure 30 , Figure 31 , Figure 32 , Figure 33 , Figure 34 , Figure 35 and Figure 36 As shown. From Figure 29 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.03mm to 0.03mm, indicating that the optical lens 400 can effectively correct field curvature. From Figure 30 As can be seen, the F-θ distortion of the 400mm optical lens is controlled within -22% to 0%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image. From Figure 31 As can be seen, in this embodiment, the MTF value is above 0.4 across the entire field of view at an operating temperature of 20℃. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at room temperature. Figure 32 As can be seen, in this embodiment, the MTF value is above 0.4 across the entire field of view at an operating temperature of -40℃. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at low temperatures. Figure 33 As can be seen, in this embodiment, the MTF value at an operating temperature of 85℃ is above 0.3 across the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and detail resolution even at higher temperatures. Figure 34 As can be seen, the axial aberration offset in this embodiment is controlled within -0.02mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration. From Figure 35 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within 0–4 μm, indicating that the optical lens can excellently correct chromatic aberration at the edges of the field of view and the second-order spectrum of the entire image plane. From Figure 36 As can be seen, the relative illumination value of the optical lens is still greater than 80% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0167] Please refer to Table 5 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, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0168] Table 5

[0169]

[0170]

[0171] 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 large aperture, large field of view, and high imaging quality.

[0172] 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.

[0173] 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, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging surface along the optical axis, successively comprise: a first lens with negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens with negative focal power, both the object side surface and the image side surface of which are concave surfaces; a third lens with positive focal power, both the object side surface and the image side surface of which are convex surfaces; a fourth lens with positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fifth lens with positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a sixth lens with negative focal power, both the object side surface and the image side surface of which are concave surfaces; a seventh lens with positive focal power, both the object side surface and the image side surface of which are convex surfaces; wherein the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1 < (R9+R12) / (R9-R12) < 0; the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 65° < FOVxf / IH ≤ 80.14°.

2. The optical lens of claim 1, wherein, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -0.95 ≤ (R9+R12) / (R9-R12) ≤ -0.27; the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 69.03° ≤ FOVxf / IH ≤ 80.14°.

3. The optical lens of claim 1, wherein, the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -126.38 ≤ R7 / f < -5.

4. The optical lens of claim 1, wherein, the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -20 < R9 / f < -4.

5. The optical lens of claim 1, wherein, the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 5 < R12 / f ≤ 516.

00.

6. The optical lens of claim 1, wherein, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 4 < R7 / R8 ≤ 70.

80.

7. The optical lens of claim 1, wherein, the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: 2 < R12 / R13 ≤ 91.

07.

8. The optical lens of claim 1, wherein, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0 < (R7-R8) / (R7+R8) < 1.

9. The optical lens of claim 1, wherein, 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 < (R9-R10) / (R9+R10) < 1.

10. The optical lens of claim 1, wherein, the object side surface sagittal height Sag9 of the fifth lens satisfies: -0.2 mm < Sag9 < 0; the distance CT23 between the second lens and the third lens on the optical axis, the distance CT34 between the third lens and the fourth lens on the optical axis, and the distance CT45 between the fourth lens and the fifth lens on the optical axis satisfy: 3.5 < (CT23+CT34) / CT45 < 13.

Images