Optical lens

Abstract

The application provides an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with negative focal length, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with positive focal length, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with negative focal length, the object side of which is a convex surface and the image side of which is a concave surface; a fourth lens with positive focal length, the object side of which is a convex surface and the image side of which is a convex surface; a fifth lens with positive focal length, the object side of which is a concave surface and the image side of which is a convex surface; a sixth lens with negative focal length, the object side of which is a concave surface and the image side of which is a convex surface; and a seventh lens with positive focal length, the object side of which is a convex surface and the image side of which is a concave surface. The optical lens provided by the application has the advantages of excellent imaging quality due to specific surface shape setting and reasonable focal length distribution.

Description

TECHNICAL FIELD

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

[0002] The law enforcement instrument is mainly used for digital recording of the scene in the law enforcement process, such as video shooting, photographing, audio recording and the like, so as to provide effective scene image data after the event. In the process of on-site law enforcement, law enforcement personnel need to record a larger range and clear image, however, the lens of the law enforcement instrument on the market is too small, the recorded image is dark, or the field of view is too small, and too many pictures cannot be recorded.

[0003] Therefore, how to make the lens of the law enforcement instrument meet high imaging quality is a problem to be solved at present. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens, which has the advantages of excellent imaging quality.

[0005] The technical scheme adopted by the present application is:

[0006] An optical lens is composed of seven lenses, which includes, along the optical axis from the object side to the imaging surface:

[0007] The first lens has negative focal power, the object side surface is convex, and the image side surface is concave;

[0008] The second lens has positive focal power, the object side surface is convex, and the image side surface is concave;

[0009] The third lens has negative focal power, the object side surface is convex, and the image side surface is concave;

[0010] The fourth lens has positive focal power, the object side surface is convex, and the image side surface is convex;

[0011] The fifth lens has positive focal power, the object side surface is concave, and the image side surface is convex;

[0012] The sixth lens has negative focal power, the object side surface is concave, and the image side surface is convex;

[0013] The seventh lens has positive focal power, the object side surface is convex, and the image side surface is concave;

[0014] Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.8 < TTL / f < 5.5; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.7 < TTL / IH < 2.

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

[0016] It is further preferred that the effective focal length f of the optical lens and a combined focal length fa of the first lens, the second lens and the third lens satisfy: -1.5 < fa / f < -0.6; and the effective focal length f of the optical lens and a combined focal length fb of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.8 < fb / f < 1.5.

[0017] It is further preferred that the effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -1.5 < f1 / f < -1.1; and a radius of curvature R1 of the object side surface of the first lens and a radius of curvature R2 of the image side surface of the first lens satisfy: 5 < R1 / R2 < 9.

[0018] It is further preferred that the effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: 10 < f2 / f < 50; and a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the image side surface of the second lens satisfy: 0.7 < R3 / R4 < 1.2.

[0019] It is further preferred that the effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: -12 < f3 / f < -3.5; and a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the image side surface of the third lens satisfy: 2 < R5 / R6 < 8.

[0020] It is further preferred that the effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: 0.85 < f4 / f < 1.3; and a radius of curvature R7 of the object side surface of the fourth lens and a radius of curvature R8 of the image side surface of the fourth lens satisfy: -2 < R7 / R8 < -1.

[0021] It is further preferred that the effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 1.3 < f5 / f < 2.2; and the effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: -4 < f6 / f < -1.5.

[0022] It is further preferred that the effective focal length f of the optical lens and a focal length f7 of the seventh lens satisfy: 4 < f7 / f < 15; and a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.4 < R13 / R14 < 1.

[0023] It is further preferred that the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.15 < f1 / f2 < -0.02.

[0024] It is further preferred that the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 0.2 < CT2 / CT3 < 0.4; and the central thickness of the third lens and the central thickness CT4 of the fourth lens satisfy: 1.4 < CT3 / CT4 < 2.6.

[0025] Compared with the prior art, the optical lens provided by the application has a large aperture through specific surface shape setting and reasonable focal power distribution, can realize high-definition imaging in a dim environment, has an ultra-wide angle, can obtain more scene information, and meets the demand of wide-range shooting. In addition, the optical lens can reasonably correct overall aberration, can realize high-definition imaging, and improves the imaging quality of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0026] 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:

[0027] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0028] Figure 2 FIG. 2 is an F-Theta distortion curve diagram of the optical lens according to the embodiment of the present application.

[0029] Figure 3 FIG. 3 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.

[0030] Figure 4 FIG. 4 is an axial aberration curve diagram of the optical lens according to the embodiment of the present application.

[0031] Figure 5 FIG. 5 is a transverse chromatic aberration curve diagram of the optical lens according to the embodiment of the present application.

[0032] Figure 6 FIG. 6 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0033] Figure 7 FIG. 7 is an F-Theta distortion curve diagram of the optical lens according to the embodiment of the present application.

[0034] Figure 8 FIG. 8 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.

[0035] Figure 9 FIG. 9 is an axial aberration curve diagram of the optical lens according to the embodiment of the present application. FIG. 10 is a transverse chromatic aberration curve diagram of the optical lens according to the embodiment of the present application.

[0036] Figure 10 A curve graph of the optical lens in the embodiment 2 of the present application is shown in FIG. 4.

[0037] Figure 11 A structure diagram of the optical lens in the embodiment 3 of the present application is shown in FIG. 6.

[0038] Figure 12 A F-Theta distortion curve graph of the optical lens in the embodiment 3 of the present application is shown in FIG. 7.

[0039] Figure 13 A curve graph of the optical lens in the embodiment 3 of the present application is shown in FIG. 4.

[0040] Figure 14 A curve graph of the optical lens in the embodiment 3 of the present application is shown in FIG. 4.

[0041] Figure 15 A curve graph of the optical lens in the embodiment 3 of the present application is shown in FIG. 4.

[0042] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0043] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0045] 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 the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0046] In the present disclosure, 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.

[0047] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when 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.

[0048] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms 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.

[0049] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0050] The optical lens provided by the embodiments of the present application is composed of seven lenses, which include, along the optical axis from the object side to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0051] In some embodiments, the first lens can have a negative focal power, the object side surface thereof is convex, and the image side surface thereof is concave. The second lens can have a positive focal power, the object side surface thereof is convex, and the image side surface thereof is concave. The third lens can have a negative focal power, the object side surface thereof is convex, and the image side surface thereof is concave. The fourth lens can have a positive focal power, the object side surface thereof is convex, and the image side surface thereof is convex. The fifth lens can have a positive focal power, the object side surface thereof is concave, and the image side surface thereof is convex. The sixth lens can have a negative focal power, the object side surface thereof is concave, and the image side surface thereof is convex. The seventh lens can have a positive focal power, the object side surface thereof is convex, and the image side surface thereof is concave.

[0052] In some embodiments, the optical lens can further include a diaphragm, which can be located between the third lens and the fourth 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 third lens and the fourth lens, the correction of the diaphragm aberration is facilitated.

[0053] In some embodiments, the optical lens can further include a filter, which can be disposed between the seventh lens and the imaging surface. 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.

[0054] In some embodiments, the fifth lens and the sixth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to decentration, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; 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.

[0055] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.8 < TTL / f < 5.5. Satisfying the above condition can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens.

[0056] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.7 < TTL / IH < 2. Satisfying the above condition ensures that the lens has a larger image surface under the condition of the same total length, which can match a larger size imaging chip to realize high-definition imaging, and better realize the balance between the small total length and the large image surface of the lens.

[0057] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.6 < IH / f < 3. Satisfying the above condition can realize wide-angle characteristics to meet the demand for wide-range shooting, and can also realize large-image surface characteristics to improve the imaging quality of the optical lens.

[0058] In some embodiments, the effective focal length f of the optical lens and the combined focal length fa of the first lens, the second lens, and the third lens satisfy: -1.5 < fa / f < -0.6. Satisfying the above condition can facilitate the convergence of light in a large angle range to realize ultra-wide-angle characteristics by reasonably setting the negative refractive power of the diaphragm front lens group, while improving the resolving power of the edge field, and achieving a balance between the short total length of the optical lens and the good imaging quality.

[0059] In some embodiments, the effective focal length f of the optical lens and the combined focal length fb of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.8 < fb / f < 1.5. By satisfying the above condition, by reasonably setting the positive refractive power of the stop rear lens group, the distortion and astigmatism generated by the front end lens of the optical lens are balanced, and the imaging quality of the optical lens is improved.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.5 < f1 / f < -1.1. By satisfying the above condition, by setting the first lens to have a negative refractive power and a meniscus shape, the first lens can accommodate a larger angle of light and collect as much light as possible into the rear optical system, achieving a large field of view while increasing the light flux.

[0061] 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: 5 < R1 / R2 < 9. By satisfying the above condition, the first lens is set to be a convex-concave meniscus surface type, which helps to converge incident light and reduce the head lens aperture, facilitating the miniaturization of the head, while the first lens can be made of glass, which has a scratch-resistant effect and prevents the lens from being scratched during use, affecting the imaging quality.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 10 < f2 / f < 50; the object side surface radius of curvature R3 of the second lens and the image side surface radius of curvature R4 of the second lens satisfy: 0.7 < R3 / R4 < 1.2. By satisfying the above conditions, the large range of light entering the system can be effectively converged, which is beneficial to avoid excessive deflection of light caused by excessive concentration of the optical power of the first lens, and to reduce the difficulty of aberration correction.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -12 < f3 / f < -3.5; the object side surface radius of curvature R5 of the third lens and the image side surface radius of curvature R6 of the third lens satisfy: 2 < R5 / R6 < 8. By satisfying the above conditions, the deflection degree of the incident light is reduced, the excessive aberration caused by excessive refraction change is avoided, and the various aberrations generated by the front lens group are balanced, thereby improving the overall imaging quality.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.85 < f4 / f < 1.3. By satisfying the above condition, the light can be effectively converged, the difficulty of correcting the edge field distortion is reduced, the lens can achieve a large field of view while having small distortion, and the overall imaging quality is improved.

[0065] 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 -2 < R7 / R8 < -1. By setting the biconvex surface type of the fourth lens, the light rays can be converged gently, the turning distance of the light rays can be shortened, and the total length of the optical lens can be further reduced.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy 1.3 < f5 / f < 2.2. By satisfying the above condition, the light converging ability of the optical lens can be improved, and the aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy -4 < f6 / f < -1.5. By setting the sixth lens to have an appropriate negative focal length, the light rays converged by the fourth lens and the fifth lens can be diverged, and the image height of the optical lens can be increased.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy 4 < f7 / f < 15, and the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy 0.4 < R13 / R14 < 1. By satisfying the above conditions, the area of the light rays entering the imaging surface can be increased, the large target surface imaging of the lens can be realized, and the imaging quality of the optical lens can be improved.

[0069] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy -0.15 < f1 / f2 < -0.02. By satisfying the above condition, the light deflection caused by the excessive concentration of the focal length of the first lens can be avoided, and the difficulty of chromatic aberration correction of the optical lens can be reduced under the premise of ensuring that the optical lens has an ultra-wide angle.

[0070] In some embodiments, the center thickness CT2 of the second lens and the center thickness CT3 of the third lens satisfy 0.2 < CT2 / CT3 < 0.4, and the center thickness of the third lens and the center thickness CT4 of the fourth lens satisfy 1.4 < CT3 / CT4 < 2.6. By satisfying the above conditions, the assembly deformation and assembly difficulty of the lens can be reduced while meeting the assembly stability requirement, and the structure of the lens can be more compact, which is beneficial to realize the miniaturization of the lens.

[0071] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy 60° < (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 optical lens can have the characteristics of large field of view and large image surface.

[0072] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.9 < BFL / f < 1.1. Satisfying the above condition, the lens has a suitable back focus, ensuring the compatibility of the lens and the body while making the structure of the lens more compact.

[0073] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -9 < f3 / f4 < -3. Satisfying the above condition, the divergent light rays can smoothly enter the rear optical system, reducing the difficulty of correcting field curvature and distortion and improving the overall resolving power.

[0074] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.8 < f5 / f6 < -0.5. Satisfying the above condition, by reasonably setting the focal length relationship of the fifth and sixth lenses, the chromatic aberration of the system can be effectively corrected, and the overall imaging quality is improved.

[0075] In some embodiments, the combined focal length fa of the first lens, the second lens, and the third lens and the combined focal length fb of the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: -1 < fa / fb < -0.6. Satisfying the above condition, by reasonably setting the lens group relationship before and after the diaphragm, it is beneficial to balance various aberrations of the system and improve the overall imaging quality.

[0076] In some embodiments, the effective focal length f of the optical lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 5 < f56 / f < 2.5. Satisfying the above condition, the fifth and sixth lenses form a cemented lens with positive refractive power, and by reasonably setting the focal length and thickness of the fifth and sixth cemented lenses, the incident light can be further converged, the light energy loss is reduced, and the divergent light rays can smoothly enter the rear after convergence, further making the light rays stable transition, and improving the relative luminance of the edge field of view.

[0077] In some embodiments, the optical lens satisfies the condition formula: 17mm < TTL < 18mm, 3mm < f < 5mm, 9mm < IH < 10mm, Fno < 1.9, 165° < FOV < 175°; 13° < CRA < 14°; wherein, TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, IH represents the real image height corresponding to the maximum field angle of the optical lens, Fno represents the aperture value of the optical lens, FOV represents the maximum field angle of the optical lens, and CRA represents the chief ray incidence angle at the maximum image height of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiment of the present application has a larger field angle, can record a larger range of pictures during shooting, has a larger target surface, can be matched with an imaging lens of an ultra-large target surface, is beneficial to improving the resolution of the lens and the degree of detail restoration of the image, and can realize higher-pixel imaging, has a large aperture performance, can record a brighter image, and can realize high-definition imaging even in a dim environment, and has a smaller CRA, can be better matched with a small CRA chip, and can ensure good resolution quality.

[0078] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The first lens and the fourth lens in the optical lens provided by the present application are glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses.

[0079] 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 a spherical lens or an aspherical lens. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the first lens adopts a spherical lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens all adopt an aspherical lens, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0080] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0081]

[0082] Wherein, z is the distance of the curved surface and the curved surface vertex in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the curved surface vertex, K is the quadratic curved surface coefficient, B, C, D, E, F, G, H are the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, sixteenth order curved surface coefficient respectively.

[0083] 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.

[0084] Embodiment 1

[0085] 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 S16, a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.

[0086] The first lens L1 has negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0087] The second lens L2 has positive focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;

[0088] The third lens L3 has negative focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface;

[0089] The fourth lens L4 has positive focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface;

[0090] The fifth lens L5 has positive focal power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface;

[0091] The sixth lens L6 has negative focal power, the object side surface S10 is a concave surface, and the image side surface S11 is a convex surface;

[0092] The fifth lens L5 and the sixth lens L6 form a cemented lens group with positive focal power, that is, the cemented surface of the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0093] The seventh lens L7 has positive focal power, the object side surface S12 is a convex surface, and the image side surface S13 is a concave surface;

[0094] The object side S14 and the image side S15 of the filter G1 are both planar;

[0095] The imaging surface S16 is planar.

[0096] The first lens L1 is a glass spherical lens, the fourth lens L4 is a glass aspherical lens, and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastic aspherical lenses.

[0097] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0098] Table 1-1

[0099]

[0100] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0101] Table 1-2

[0102]

[0103] Figure 2 An F-Theta distortion curve of the optical lens 100 in the embodiment is shown, which represents the distortion of different field angles on the imaging surface. 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%, which shows that the optical lens 100 can better correct the distortion.

[0104] Figure 3 A curve of the field curvature of the optical lens 100 in the embodiment is shown, which represents the field curvature of the meridional image surface and the sagittal image surface. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.5mm, which shows that the optical lens 100 can better correct the field curvature.

[0105] Figure 4 An axial aberration curve of the optical lens 100 in the embodiment is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface. 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 offset of the axial aberration is controlled within ±0.03mm, which shows that the optical lens 100 can better correct the axial aberration.

[0106] Figure 5A curve graph of the transverse chromatic aberration 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 (0.55 μm), the horizontal axis represents the transverse 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 graph, the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±10 μm, which shows that the optical lens 100 can better correct chromatic aberration.

[0107] Embodiment 2

[0108] Referring to Figure 6 , a structure schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application is shown, and the main difference between the embodiment and the embodiment 1 is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0109] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.

[0110] Table 2-1

[0111]

[0112]

[0113] The surface type parameters of the aspherical lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.

[0114] Table 2-2

[0115]

[0116] In the embodiment, the F-Theta distortion curve graph, the field curvature curve graph, the axial aberration curve graph, and the transverse chromatic aberration curve graph of the optical lens 200 are shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 respectively.

[0117] As can be seen from Figure 7 , the distortion value is controlled within ±8%, which shows that the optical lens 200 can better correct distortion.

[0118] As can be seen from Figure 8 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.25 mm, which shows that the optical lens 200 can better correct field curvature.

[0119] As can be seen from Figure 9 , the offset of the axial aberration is controlled within ±0.03 mm, which shows that the optical lens 200 can better correct axial aberration.

[0120] It can be seen from Figure 10 that the longest wavelength and the shortest wavelength are controlled within ±10μm, which shows that the optical lens 200 can better correct chromatic aberration.

[0121] Embodiment 3

[0122] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens 300 provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0123] The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0124] Table 3-1

[0125]

[0126] The surface type parameters of the aspherical lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0127] Table 3-2

[0128]

[0129] In this embodiment, the F-Theta distortion curve, the field curvature curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 300 are shown in Figure 12 , Figure 13 , Figure 14 , Figure 15 respectively.

[0130] It can be seen from Figure 12 that the distortion value is controlled within ±9%, which shows that the optical lens 300 can better correct distortion.

[0131] It can be seen from Figure 13 that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.25mm, which shows that the optical lens 300 can better correct field curvature.

[0132] It can be seen from Figure 14 that the offset of the axial aberration is controlled within ±0.04mm, which shows that the optical lens 300 can better correct axial aberration.

[0133] It can be seen from Figure 15 that the longest wavelength and the shortest wavelength are controlled within ±10μm, which shows that the optical lens 300 can better correct chromatic aberration.

[0134] Please refer to Table 4 for the optical characteristics corresponding to the above-mentioned embodiments, 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 angle, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.

[0135] Table 4

[0136]

[0137]

[0138] In summary of the above embodiments, the optical lens provided by the present application has at least the following advantages:

[0139] (1) By means of specific surface shape setting and reasonable power distribution, the lens has a large aperture, can realize high-definition imaging even in a dim environment, and has an ultra-wide angle, so as to obtain more scene information and meet the demand of wide-range shooting.

[0140] (2) The optical lens of the present application can reasonably correct the overall aberration of the optical lens, realize high-definition imaging, and improve the imaging quality of the optical lens.

[0141] (3) The glass-plastic hybrid structure is adopted to improve the stability of the lens under high and low temperature conditions and to improve the imaging quality; at the same time, the lens has a small CRA, which can well match the chip and ensure good resolution quality.

[0142] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0143] The above-described embodiments only express several embodiments of the present application, which are described in a more specific and detailed manner, but should not be understood as limiting the scope of the present patent. It should be noted that for ordinary skilled persons 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 scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that, It includes in sequence from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose object side is convex and whose image side is concave; A second lens with a positive optical power, whose object side is convex and whose image side is concave; A third lens with a negative optical power, whose object side is convex and whose image side is concave; A fourth lens with a positive optical power, whose object side is convex and whose image side is convex; A fifth lens with a positive optical power, whose object side is concave and whose image side is convex; A sixth lens with a negative optical power, whose object side is concave and whose image side is convex; A seventh lens with a positive optical power, whose object side is convex and whose image side is concave; Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.8 < TTL / f < 5.5; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.7 < TTL / IH < 2.

2. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.6 < IH / f < 3.

3. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the combined focal length fa of the first lens, the second lens, and the third lens satisfy: -1.5 < fa / f < -0.6; the effective focal length f of the optical lens and the combined focal length fb of the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: 0.8 < fb / f < 1.

5.

4. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.5 < f1 / f < -1.1; the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: 5 < R1 / R2 < 9.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 10 < f2 / f < 50; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.7 < R3 / R4 < 1.

2.

6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -12 < f3 / f < -3.5; the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: 2 < R5 / R6 < 8.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.85 < f4 / f < 1.3; the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -2 < R7 / R8 < -1.

8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.3 < f5 / f < 2.2; the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -4 < f6 / f < -1.

5.

9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 4 < f7 / f < 15; the object-side curvature radius R13 of the seventh lens and the image-side curvature radius R14 of the seventh lens satisfy: 0.4 < R13 / R14 < 1.

10. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.15 < f1 / f2 < -0.

02.

11. The optical lens according to claim 1, characterized in that, The central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 0.2 < CT2 / CT3 < 0.4; the central thickness of the third lens and the central thickness CT4 of the fourth lens satisfy: 1.4 < CT3 / CT4 < 2.6.

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