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 an image side of the first lens is a concave surface; a second lens with negative optical power, wherein an object side of the second lens is a convex surface, and an image side of the second lens is a concave surface; a third lens with negative optical power, wherein an object side of the third lens is a convex surface, and an image side of the third lens is a concave surface; a fourth lens with positive optical power, wherein an object side of the fourth lens is a convex surface; a fifth lens with positive optical power, wherein an object side of the fifth lens is a convex surface; a sixth lens with positive optical power, wherein an object side of the sixth lens is a convex surface near an optical axis; and a seventh lens with positive optical power, wherein an object side of the seventh lens is a convex surface, and an image side of the seventh lens is a convex surface. The optical lens provided by the application has one or more advantages of super wide angle, super large aperture, large image surface, high pixel, high imaging quality and the like by specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved. In the field of vehicle driving, the conventional driving recorder lens cannot simultaneously compatible with large aperture, large wide angle, high pixel and many other advantages. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages such as ultra-wide angle, ultra-large aperture, high pixel, etc.

[0004] The present application provides an optical lens, which has seven lenses, and comprises, in order from the object side to the imaging surface along the optical axis:

[0005] a first lens with negative focal power, the image side surface of which is a concave surface;

[0006] a second 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;

[0007] a third 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;

[0008] a fourth lens with positive focal power, the object side surface of which is a convex surface;

[0009] a fifth lens with positive focal power, the object side surface of which is a convex surface;

[0010] a sixth lens with positive focal power, the object side surface of which is a convex surface near the optical axis;

[0011] a seventh lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface;

[0012] wherein the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 130°<FOV / Fno<150°.

[0013] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2<TTL / f<7.5.

[0014] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 55°<(f×FOV) / IH<65°.

[0015] It is further preferred that the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.6 < TTL / IH < 3.

[0016] It is further preferred that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 < f1 / f < -1.9.

[0017] It is further preferred that the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.4 < f4 / f < 3.4.

[0018] It is further preferred that the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 < f7 / f < 1.7.

[0019] It is further preferred that the real image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 8mm < IH / Fno < 9.2mm.

[0020] It is further preferred that the sagittal half vertex radius height SAG51 of the fifth lens and the central thickness CT5 of the fifth lens satisfy: 0.3 < SAG51 / CT5 < 0.38.

[0021] It is further preferred that the distance CT34 of the third lens and the fourth lens on the optical axis, the distance CT45 of the fourth lens and the fifth lens on the optical axis, the distance CT56 of the fifth lens and the sixth lens on the optical axis, the distance CT67 of the sixth lens and the seventh lens on the optical axis, and the total track length TTL of the optical lens satisfy: 0.01 < (CT34+CT45+CT56+CT67) / TTL < 0.04.

[0022] Compared with the prior art, the optical lens provided by the present application adopts seven lenses with specific focal lengths, and through specific surface shape matching and reasonable focal length distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of super wide angle, super large aperture, large image surface, high pixel, high imaging quality, etc. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0024] Figure 1 FIG. 1 is a structure diagram of an optical lens according to an embodiment of the present application.

[0025] Figure 2A field curvature curve of the optical lens in Embodiment 1 of the present application.

[0026] Figure 3 An f-θ distortion curve of the optical lens in Embodiment 1 of the present application.

[0027] Figure 4 An axial aberration curve of the optical lens in Embodiment 1 of the present application.

[0028] Figure 5 A lateral chromatic aberration curve of the optical lens in Embodiment 1 of the present application.

[0029] Figure 6 A structure diagram of the optical lens in Embodiment 2 of the present application.

[0030] Figure 7 A field curvature curve of the optical lens in Embodiment 2 of the present application.

[0031] Figure 8 An f-θ distortion curve of the optical lens in Embodiment 2 of the present application.

[0032] Figure 9 An axial aberration curve of the optical lens in Embodiment 2 of the present application.

[0033] Figure 10 A lateral chromatic aberration curve of the optical lens in Embodiment 2 of the present application.

[0034] Figure 11 A structure diagram of the optical lens in Embodiment 3 of the present application.

[0035] Figure 12 A field curvature curve of the optical lens in Embodiment 3 of the present application.

[0036] Figure 13 An f-θ distortion curve of the optical lens in Embodiment 3 of the present application.

[0037] Figure 14 An axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0038] Figure 15 A lateral chromatic aberration curve of the optical lens in Embodiment 3 of the present application.

[0039] The following detailed description will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0040] For a better understanding of the present application, various aspects of the present application will be presented in more detail by referring to the attached drawings. It should be understood that these detailed descriptions are merely descriptive of the embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that the expressions first, second, third and the like in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0042] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0043] In this specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0044] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0046] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0047] The optical lens provided by the embodiment of the present application comprises seven lenses, and sequentially comprises, along the optical axis from the object side to the imaging surface, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.

[0048] In some embodiments, the first lens can have a negative focal power, the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof is a concave surface. The second lens can have a negative focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface. The third lens can have a negative focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface. The fourth lens can have a positive focal power, the object side surface thereof is a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The fifth lens can have a positive focal power, the object side surface thereof is a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The sixth lens has a positive focal power, the object side surface thereof is a convex surface at the near optical axis, and the image side surface thereof can be a concave surface or a convex surface. The seventh lens can have a positive focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a convex surface.

[0049] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the second lens and the third lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. When the diaphragm is located between the second lens and the third lens, the correction of the diaphragm aberration is facilitated.

[0050] In some embodiments, the optical lens can further comprise a filter and a protective glass, which can be sequentially arranged between the seventh lens and the imaging surface along the optical axis. The filter is used to filter out the interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting the normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged and affecting the imaging effect of the lens.

[0051] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 130°<FOV / Fno<150°. By satisfying the above condition, the lens can improve the light flux through the large aperture while realizing the large view angle, and the recording view angle is more extensive.

[0052] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2<TTL / f<7.5. By satisfying the above condition, the length of the lens can be effectively limited, which is beneficial to realize the miniaturization of the optical lens.

[0053] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 55° < (f x FOV) / IH < 65°. By reasonably limiting the relationship among the focal length, the field of view, and the image height of the optical lens, the balance between the large field of view and the large target surface imaging of the optical lens is achieved, and the use requirement of the wide-angle shooting of the driving recorder is better met.

[0054] 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 FOV of the optical lens satisfy: 2.6 < TTL / IH < 3. By satisfying the above condition, the miniaturization of the lens is better achieved, and at the same total length, the lens has a larger image surface, which can match a larger size imaging chip to realize high-definition imaging.

[0055] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 < f1 / f < -1.9. By satisfying the above condition, the first lens has an appropriate negative focal length, which is beneficial to expand the field of view of the optical lens.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.4 < f4 / f < 3.4. By satisfying the above condition, the focal length of the fourth lens is reasonably set, which is beneficial 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.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 < f7 / f < 1.7. By satisfying the above condition, the seventh lens adopts a short focal length, which is helpful for light collection, ensures the light quantity, improves the relative luminance, and improves the brightness of the optical lens at the image surface.

[0058] In some embodiments, the real image height IH corresponding to the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 8 mm < IH / Fno < 9.2 mm. By satisfying the above condition, the optical lens has a large image surface while ensuring a large aperture, achieving the balance between the large image surface and the large aperture.

[0059] In some embodiments, the object side half optical diameter sagittal height SAG51 of the fifth lens and the center thickness CT5 of the fifth lens satisfy: 0.3 < SAG51 / CT5 < 0.38. By satisfying the above condition, by appropriately adjusting the ratio of the sagittal height and the thickness of the fifth lens, the lens manufacturing and forming are facilitated, the manufacturing yield is improved, and the total length of the optical lens is shortened.

[0060] In some embodiments, the interval CT34 of the third lens and the fourth lens on the optical axis, the interval CT45 of the fourth lens and the fifth lens on the optical axis, the interval CT56 of the fifth lens and the sixth lens on the optical axis, and the interval CT67 of the sixth lens and the seventh lens on the optical axis satisfy: 0.01 < (CT34 + CT45 + CT56 + CT67) / TTL < 0.04, where TTL is the total length of the optical lens. Satisfying the above condition ensures that the intervals between the third, fourth, fifth, sixth and seventh lenses are not too large, thereby controlling the lens length, and on the basis of satisfying the miniaturization of the optical lens, reducing the energy level of ghost reflection between the lenses, achieving miniaturization and weak ghosting.

[0061] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < IH / f < 2.6. Satisfying the above condition can achieve a larger field of view angle and imaging range, which can realize large image characteristics while ensuring the depth of field of the optical lens, thereby improving the imaging quality of the optical system.

[0062] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -650 < f2 / f < -24; and the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -8.5 < f3 / f < -4.5. Satisfying the above conditions, the second lens and the third lens are both negative lenses, which can further emit light and improve the field of view angle of the imaging system.

[0063] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.8 < f5 / f < 3; and the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 5.5 < f6 / f < 33. Satisfying the above conditions, the fifth and sixth lenses both have positive focal power, which can further focus light, adjust the chief ray angle, optimize the imaging quality, correct residual aberrations (such as distortion, chromatic aberration, etc.), and reduce the distortion of the wide-angle lens.

[0064] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.62 < BFL / f < 0.9. Satisfying the above range is conducive to balancing between obtaining good imaging quality and easily assembling the optical back focal length, ensuring the imaging quality of the optical lens while avoiding interference between the lens and other elements, and reducing the assembly process difficulty of the camera module.

[0065] In some embodiments, the object side surface radius of curvature R1 of the first lens and the image side surface radius of curvature R2 of the first lens satisfy: -50 < R1 / R2 < 8. Satisfying the above condition can reasonably set the surface shape of the first lens, enhance the light collecting ability of the first lens, and thereby realize an ultra-large field of view angle.

[0066] In some embodiments, the object-side surface curvature radius R3 of the second lens and the image-side surface curvature radius R4 of the second lens satisfy: 5 < (R3+R4) / (R3-R4) < 6. The satisfaction of the above range can make the light ray trend more stable.

[0067] In some embodiments, the object-side surface curvature radius R5 of the third lens and the image-side surface curvature radius R6 of the third lens satisfy: 2.7 < (R5+R6) / (R5-R6) < 6.3. The satisfaction of the above range can correct coma and field curvature, improve the flatness of imaging, and improve the imaging quality of the optical lens.

[0068] In some embodiments, the object-side surface curvature radius R11 of the sixth lens and the image-side surface curvature radius R12 of the sixth lens satisfy: -11 < (R11+R12) / (R11-R12) < 0.15. The satisfaction of the above condition can moderate the deflection degree of the light ray passing through the lens and effectively reduce aberration.

[0069] In some embodiments, the object-side surface curvature radius R13 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy: 0.32 < (R13+R14) / (R13-R14) < 0.8. The satisfaction of the above range reasonably limits the shape of the object-side surface and the image-side surface of the seventh lens, which can control the seventh lens to have a proper surface type, help control the light ray trend of the edge field of view, and improve the imaging quality of the edge field of view.

[0070] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -3.3 < f3 / f4 < -1.6. The satisfaction of the above range can shorten the system length by reasonably setting the focal length ratio of the third lens and the fourth lens, and can make the lens have smaller distortion and aberration and provide high-definition imaging effect.

[0071] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.7 < f1 / f7 < -1.4. The satisfaction of the above condition can increase the area of the light ray entering the imaging surface by reasonably setting the focal length relationship of the first and last lenses in the lens, which is conducive to realizing large image surface imaging of the lens while increasing the amount of light entering, and improving the relative luminance of the system.

[0072] In some embodiments, the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 0.58 < CT3 / CT4 < 1. The satisfaction of the above condition can reasonably configure the ratio of the thickness of the third lens on the optical axis and the thickness of the fourth lens on the optical axis, and the third lens and the fourth lens can be mutually regulated to maintain the miniaturization feature of the optical system.

[0073] In some embodiments, a sum of central thicknesses of the first lens to the seventh lens along the optical axis, ∑CT, satisfies: 0.65 < ∑CT / TTL < 0.75, where TTL is the total track length of the optical lens. Satisfying the above condition can effectively compress the total length of the optical lens, while facilitating the structural design and production process of the optical lens.

[0074] In some embodiments, a half-field radius sagittal height of the object side of the second lens, SAG21, satisfies: -0.02 < SAG21-SAG22 < 0.65, where SAG22 is a half-field radius sagittal height of the image side of the second lens. Satisfying the above condition facilitates the constraint of the shape of the second lens and the reasonable control of the lens angle of the second lens by controlling the relationship between the sagittal height of the image side and the sagittal height of the object side of the second lens, thereby facilitating the improvement of the process of the lens. In addition, by reasonably constraining the lens shape of the second lens, the risk of ghosting of the second lens can be effectively reduced.

[0075] In some embodiments, a half-field radius of the object side of the first lens, DM11, satisfies: 1.5 < DM11 / DM72 < 2, where DM72 is a half-field radius of the image side of the seventh lens. Satisfying the above condition effectively reduces the aperture size of the lens while ensuring that a large range of light enters the system, which facilitates the balance between a large field of view and a small aperture of the lens.

[0076] In some embodiments, a real image height IH corresponding to the maximum field of view angle of the optical lens satisfies: 2.2 < IH / EPD < 2.6, where EPD is an entrance pupil diameter of the optical lens. Satisfying the above range enables the optical lens to satisfy a sufficient image plane brightness in the edge field of view while satisfying a large image plane, thereby preventing the occurrence of dark corner phenomenon and improving the imaging quality.

[0077] In some embodiments, a real image height IH corresponding to the maximum field of view angle of the optical lens, an effective focal length f of the optical lens, and an arc value θ of the maximum half field of view angle of the optical lens satisfy: 0.92 < (IH / 2) / (f x θ) < 0.97. Satisfying the above range can make the lens have a smaller distortion value and be able to provide a high-definition imaging effect.

[0078] In some embodiments, the optical lens satisfies the condition formula: 24mm < TTL < 36mm, 3.5mm < f < 3.9mm, 140° < FOV < 150°, 8.5mm < IH < 9.2mm, 1 < Fno < 1.1, wherein TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, and Fno represents the aperture value of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiment of the application has one or more advantages such as a large image surface, a large field of view angle, and a large aperture.

[0079] In some embodiments, the seven lenses in the optical lens can all adopt plastic lenses or adopt a glass-plastic hybrid material collocation structure. Preferably, the optical lens of the application adopts a seven-lens glass-plastic hybrid collocation structure, which can improve the thermal stability. Specifically, the first lens and the fourth lens can adopt glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens can all be plastic lenses. Adopting a glass-plastic hybrid structure can effectively reduce the cost, correct the aberration, reduce the volume, and provide an optical lens product with higher cost performance.

[0080] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt spherical lenses or aspherical lenses. Compared with a spherical structure, an 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 achieving lens miniaturization. More specifically, the first lens and the fourth lens in the optical lens provided by the application can adopt spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens can adopt aspherical lenses.

[0081] In various embodiments of the application, when the lenses adopt aspherical lenses, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0082] ;

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

[0084] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0085] Embodiment 1

[0086] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, the optical lens 100 includes, along the optical axis from the object side to the imaging surface S19, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0087] The first lens L1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0088] The second lens L2 has a negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;

[0089] The third lens L3 has a negative focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface;

[0090] The fourth lens L4 has a positive focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface;

[0091] The fifth lens L5 has a positive focal power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface;

[0092] The sixth lens L6 has a positive focal power, the object side surface S11 is a convex surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis;

[0093] The seventh lens L7 has a positive focal power, the object side surface S13 is a convex surface, and the image side surface S14 is a convex surface;

[0094] The object side surface S15 and the image side surface S16 of the filter G1 are both flat surfaces;

[0095] The object side surface S17 and the image side surface S18 of the protective glass G2 are both flat surfaces;

[0096] The imaging surface S19 is a flat surface.

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

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

[0099] Table 1-1

[0100]

[0101] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0102] Table 1-2

[0103]

[0104] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0105] Figure 2 A field curvature graph of the optical lens 100 in this embodiment is shown, showing 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 field angle (unit: degrees). As can be seen from the graph, the field curvature in the meridional and sagittal image planes is controlled within ±0.15mm, indicating that the optical lens 100 can effectively correct for field curvature.

[0106] Figure 3 The f-θ distortion curve of the optical lens 100 in this embodiment is shown, which shows the distortion at different field angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the distortion value is controlled within ±8%, indicating that the optical lens 100 is able to correct distortion well.

[0107] Figure 4 The following is a graph showing the axial aberration of the optical lens 100 in this embodiment, which shows 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 graph, the offset of the axial aberration is controlled within ±0.08 mm, indicating that the optical lens 100 is able to effectively correct the axial aberration.

[0108] Figure 5The axial chromatic aberration curve of the optical lens 100 in the embodiment is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.555 μm), the horizontal axis represents the axial chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8 μm, which shows that the optical lens 100 can better correct chromatic aberration.

[0109] Embodiment 2

[0110] Referring to Figure 6 , which is a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application. Compared with the embodiment 1, the main difference is that the image side S10 of the fifth lens L5 is concave at the near optical axis; the image side S12 of the sixth lens L6 is concave; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0111] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.

[0112] Table 2-1

[0113]

[0114] The surface type parameters of the aspheric lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.

[0115] Table 2-2

[0116]

[0117] In the embodiment, the field curvature curve, the f-θ distortion curve, the axial aberration curve, and the axial chromatic aberration curve of the optical lens 200 are shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 respectively.

[0118] As can be seen from Figure 7 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15 mm, which shows that the optical lens 200 can better correct the field curvature.

[0119] As can be seen from Figure 8 , the distortion value is controlled within ±8%, which shows that the optical lens 200 can better correct the distortion.

[0120] As can be seen from Figure 9 , the offset of the axial aberration is controlled within ±0.1 mm, which shows that the optical lens 200 can better correct the axial aberration.

[0121] As can be seen fromFigure 10 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0122] Example 3

[0123] See also Figure 11 , shown is a schematic structural diagram of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S1 of the first lens L1 is a concave surface; the image-side surface S8 of the fourth lens L4 is a concave surface; the image-side surface S10 of the fifth lens L5 is a concave surface at the near optical axis; the image-side surface S12 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0124] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0125] Table 3-1

[0126]

[0127] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0128] Table 3-2

[0129]

[0130] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 300 are shown as follows: Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 shown.

[0131] from Figure 12 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.15 mm, indicating that the optical lens 300 can correct the field curvature well.

[0132] from Figure 13 It can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 300 can correct the distortion well.

[0133] from Figure 14 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0134] from Figure 15As can be seen, the perpendicular color aberration of the longest wavelength and the shortest wavelength is controlled within ±8 μm, which indicates that the optical lens 300 can correct the color aberration well.

[0135] Referring to Table 4, the optical characteristics corresponding to the above-mentioned embodiments are shown, including the effective focal length f, the total track length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the chief ray angle CRA at the maximum image height, the maximum field of view FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.

[0136] Table 4

[0137]

[0138] In summary, the optical lens provided by the present application adopts seven pieces of glass-plastic hybrid structure, and through specific surface shape setting and reasonable power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of super wide angle, super large aperture, large image surface, high pixel, high imaging quality, etc.

[0139] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0140] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: a first lens having negative optical power and a concave image-side surface; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; a third lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a fourth lens element having positive optical power and a convex object-side surface; a fifth lens element having positive optical power and a convex object-side surface; a sixth lens element having positive refractive power, the object side surface of which is convex near the optical axis; a seventh lens element having positive refractive power, whose object-side surface and image-side surface are convex; The maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy the following conditions: 130° <FOV / Fno<150°。 2. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2 <TTL / f<7.5。 3. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 55°<(f×FOV) / IH<65°.

4. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens meet the following requirements: 2.6 <TTL / IH<3。 5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 <f1 / f<-1.9。 6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.4 <f4 / f<3.4。 7. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 <f7 / f<1.7。 8. The optical lens according to claim 1, wherein: The true image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens meet the following requirements: 8mm <IH / Fno<9.2mm。 9. The optical lens according to claim 1, wherein: The object side semi-aperture height SAG51 of the fifth lens and the center thickness CT5 of the fifth lens satisfy: 0.3 <SAG51 / CT5<0.38。 10. The optical lens according to claim 1, wherein: The distance CT34 between the third lens and the fourth lens on the optical axis, the distance CT45 between the fourth lens and the fifth lens on the optical axis, the distance CT56 between the fifth lens and the sixth lens on the optical axis, and the distance CT67 between the sixth lens and the seventh lens on the optical axis satisfy the following conditions: 0.01<(CT34+CT45+CT56+CT67) / TTL<0.04.

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