Optical lens

Abstract

The application provides an optical lens, which has six lenses with optical power, and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a convex surface; a third lens with negative optical power, whose object side surface is a concave surface and whose image side surface is a convex surface; a fourth lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a fifth lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; and a sixth lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a concave surface. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration, improves the imaging quality of the optical lens, and makes the lens have one or more advantages such as a large aperture, a short focal length, an ultralarge field of view, high imaging quality and the like.

Description

TECHNICAL FIELD

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

[0002] Nowadays, laser radar is widely used in detecting three-dimensional coordinates and ranging of objects. The laser radar includes a controller, a light source and a receiving device. The controller controls the light source to emit a light beam. The light beam is diffusely reflected after encountering a target object. The receiving device receives the reflected light beam, and determines relevant information of the target object, such as target distance, direction, height, speed, attitude and even shape parameters, according to the information of the emitted light beam and the reflected light beam. Laser radar is widely used in self-driving cars, drones, autonomous robots and lawn mowers.

[0003] As a key component of laser radar, the optical lens can receive and process the reflected light. With the increasing demand for laser radar performance in application scenarios, the optical lens parameters need to develop towards large aperture, large field of view and small aberration to meet the growing demand for high precision and wide coverage detection. The optical lens of the current laser radar has the problem of low imaging quality, which cannot meet the market demand. SUMMARY

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

[0005] The present application provides an optical lens with six lenses with optical power, which includes, along the optical axis from the object side to the imaging surface:

[0006] The first lens with negative optical power has a convex object side surface and a concave image side surface;

[0007] The second lens with positive optical power has a convex object side surface and a convex image side surface;

[0008] The third lens with negative optical power has a concave object side surface and a convex image side surface;

[0009] The fourth lens with positive optical power has a convex object side surface and a concave image side surface;

[0010] The fifth lens with positive optical power has a convex object side surface and a concave image side surface;

[0011] The sixth lens with positive optical power has a convex object side surface and a concave image side surface;

[0012] 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

[0013] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8

[0014] Further preferably, the real image height IH corresponding to the maximum field of view angle of the optical lens, the effective focal length f of the optical lens and the radian value θ of the maximum half field of view angle of the optical lens satisfy: 0.9

[0015] Further preferably, the total optical length TTL of the optical lens, the real image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 18

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -55

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 11

[0018] It is further preferred that the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 23 < f5 / f < 60; the object side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.4 < R9 / f < 3; and the image side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.2 < R10 / f < 3.1.

[0019] It is further preferred that the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 2.3 < f12 / f < 5; and the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 1 < f12 / f56 < 2.4.

[0020] It is further preferred that the object side surface curvature radius R7 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: |(R7-R8) / (R7+R8)| < 0.1; and the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: -50 < (R9+R10) / (R9-R10) < 230.

[0021] It is further preferred that the object side surface sagittal height Sag5 of the third lens and the object side surface half diameter d5 of the third lens satisfy: -0.28 < Sag5 / d5 < -0.21; and the image side surface sagittal height Sag6 of the third lens and the image side surface half diameter d6 of the third lens satisfy: -0.33 < Sag6 / d6 < -0.21.

[0022] The optical lens provided by the present application adopts six 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 such as large aperture, short focal length, super large field of view, high imaging quality, and the like. 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 structural schematic diagram of an optical lens according to an embodiment of the present application.

[0025] Figure 2 FIG. 2 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0026] Figure 3 FIG. 3 is an F-Theta distortion curve of the optical lens according to the embodiment of the present application.

[0027] Figure 4 The vertical axial chromatic aberration curve of the optical lens in the embodiment 1 of the present application.

[0028] Figure 5 The axial aberration curve of the optical lens in the embodiment 1 of the present application.

[0029] Figure 6 The relative illumination curve of the optical lens in the embodiment 1 of the present application.

[0030] Figure 7 The structure schematic diagram of the optical lens in the embodiment 2 of the present application.

[0031] Figure 8 The field curvature curve of the optical lens in the embodiment 2 of the present application.

[0032] Figure 9 The F-Theta distortion curve of the optical lens in the embodiment 2 of the present application.

[0033] Figure 10 The vertical axial chromatic aberration curve of the optical lens in the embodiment 2 of the present application.

[0034] Figure 11 The axial aberration curve of the optical lens in the embodiment 2 of the present application.

[0035] Figure 12 The relative illumination curve of the optical lens in the embodiment 2 of the present application.

[0036] Figure 13 The structure schematic diagram of the optical lens in the embodiment 3 of the present application.

[0037] Figure 14 The field curvature curve of the optical lens in the embodiment 3 of the present application.

[0038] Figure 15 The F-Theta distortion curve of the optical lens in the embodiment 3 of the present application.

[0039] Figure 16 The vertical axial chromatic aberration curve of the optical lens in the embodiment 3 of the present application.

[0040] Figure 17 The axial aberration curve of the optical lens in the embodiment 3 of the present application.

[0041] Figure 18 The relative illumination curve of the optical lens in the embodiment 3 of the present application.

[0042] Figure 19 The structure schematic diagram of the optical lens in the embodiment 4 of the present application.

[0043] Figure 20 A field curvature graph for the optical lens of Example 4 of the present application.

[0044] Figure 21 An F-Theta distortion graph for the optical lens of Example 4 of the present application.

[0045] Figure 22 A sagittal chromatic aberration graph for the optical lens of Example 4 of the present application.

[0046] Figure 23 An axial chromatic aberration graph for the optical lens of Example 4 of the present application.

[0047] Figure 24 A relative illumination graph for the optical lens of Example 4 of the present application.

[0048] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0049] 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 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.

[0050] 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.

[0051] 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 or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0052] In the present 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.

[0053] It should also be understood that the use of the terms "have", "has", "having", "include", "includes" or "including" when used in this specification, specifies 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 referring to a list of items, the use of "at least one of" indicates that an item falling within any one or more of the listed items is contemplated. Furthermore, the use of "may" when describing embodiments of the present application indicates that one or more embodiments of the present application include the possibility of the described event occurring. Also, the use of the term "example" is intended to indicate an example or an illustration, but not a preference.

[0054] 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 will 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.

[0055] It should be noted that the embodiments and features of 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 accompanying drawings and in conjunction with the embodiments.

[0056] The optical lens provided by the embodiments of the present application has six lenses with optical power, and sequentially includes, 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, and a sixth lens.

[0057] In some embodiments, the first lens can have negative optical power, the object side surface of which is convex, and the image side surface of which is concave. The second lens can have positive optical power, the object side surface of which is convex, and the image side surface of which is convex. The third lens can have negative optical power, the object side surface of which is concave, and the image side surface of which is convex. The fourth lens can have positive optical power, the object side surface of which is convex, and the image side surface of which is concave. The fifth lens can have positive optical power, the object side surface of which is convex, and the image side surface of which is concave. The sixth lens can have positive optical power, the object side surface of which is convex, and the image side surface of which is concave.

[0058] In some embodiments, the optical lens can further include 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.

[0059] In some embodiments, the optical lens can further include a filter, which is arranged between the sixth lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0060] 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 < IH / f < 2.6. Satisfying the above condition, a super large field of view angle and imaging range can be achieved, the large image surface characteristics can be realized while ensuring the depth of field of the optical lens, thereby improving the imaging quality of the optical system. More specifically, 2.25 < IH / f < 2.41.

[0061] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -10 < (R5+R6) / (R5-R6) < -5. Satisfying the above condition, the third lens has a suitable surface shape, which can further diverge light rays and improve the field of view angle of the imaging system. More specifically, -9.27 < (R5+R6) / (R5-R6) < -5.18.

[0062] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8 < TTL / f < 9.5. Satisfying the above condition, the length of the lens can be effectively limited, which is conducive to the miniaturization of the optical lens. More specifically, 8.35 < TTL / f < 8.99.

[0063] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 3.5 < TTL / IH < 4. Satisfying the above condition, the miniaturization of the lens can be better achieved, while ensuring 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. More specifically, 3.68 < TTL / IH < 6.81.

[0064] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field of view angle of the optical lens satisfy: 0.9 < (IH / 2) / (f x θ) < 1. Satisfying the above condition, the lens can have a smaller distortion value, which can provide a high-definition imaging effect. More specifically, 0.92 < (IH / 2) / (f x θ) < 0.99.

[0065] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens, the maximum field of view angle FOV of the optical lens, and the half light entrance radius d1 of the object side surface of the first lens satisfy: 2.7 < d1 / (IH / 2) / tan(FOV / 4) < 3.2. Satisfying the above range, the optical lens can have a large field of view angle and a large image surface while the front aperture is small. More specifically, 2.78 < d1 / (IH / 2) / tan(FOV / 4) < 3.11.

[0066] In some embodiments, the total track length TTL of the optical lens, the real image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 18 < 180° x TTL / (IH / 2) / (FOV / 2) < 20. Satisfying the above range is conducive to balancing the relationship among the total length, the image height, and the field of view angle of the optical lens. More specifically, 18.97 < 180° x TTL / (IH / 2) / (FOV / 2) < 19.56.

[0067] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy: 1 < f12 / f3456 < 2.5. Satisfying the above range is conducive to balancing the distortion and aberration generated by the lenses of the optical lens by reasonably setting the positive refractive power of the front and rear lens groups, and improving the imaging quality of the optical lens. More specifically, 1.16 < f12 / f3456 < 2.3.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -55 < f3 / f < -11; the object side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -1.9 < R5 / f < -1.4; and the image side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -2.5 < R6 / f < -1.8. Satisfying the above conditions, the third lens adopts a negative lens and has a suitable surface shape, which can further diverge light rays and improve the field of view angle of the imaging system. More specifically, -51.78 < f3 / f < -12.15; -1.76 < R5 / f < -1.55; and -2.33 < R6 / f < -1.93.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 11 < f4 / f < 18; the object side surface curvature radius R7 of the fourth lens and the effective focal length f of the optical lens satisfy: 1 < R7 / f < 1.3; and the image side surface curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: 1 < R8 / f < 1.2. Satisfying the above conditions, the fourth lens converges the incident light rays at the front end, which is conducive to correcting the aberration and the distortion of the edge field of view brought by the front end lens group, and can provide a high-definition imaging effect. More specifically, 11.69 < f4 / f < 16.71; 1.06 < R7 / f < 1.19; and 1.02 < R8 / f < 1.11.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 23 < f5 / f < 60; the object-side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.4 < R9 / f < 3; the image-side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.2 < R10 / f < 3.1. Satisfying the above conditions, by reasonably setting the focal length and surface shape of the fifth lens, the light rays can be smoothly transitioned, the correction of aberration is facilitated, the imaging quality of the optical lens is improved, and the stability of the optical system is ensured. More specifically, 25.44 < f5 / f < 55.37; 2.49 < R9 / f < 2.84; 2.31 < R10 / f < 2.94.

[0071] In some embodiments, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 2.3 < f12 / f < 5; the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 1 < f12 / f56 < 2.4; the combined focal length f56 of the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 1.8 < f56 / f < 2.5. Satisfying the above ranges, the light rays can be smoothly transitioned, the correction of aberration of the optical lens is facilitated, and the imaging quality of the optical lens is improved. More specifically, 2.51 < f12 / f < 4.66; 1.15 < f12 / f56 < 2.25; 2.01 < f56 / f < 2.37.

[0072] In some embodiments, the object-side surface curvature radius R7 of the fourth lens and the image-side surface curvature radius R8 of the fourth lens satisfy: |(R7-R8) / (R7+R8)| < 0.1; the object-side surface curvature radius R9 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: -50 < (R9+R10) / (R9-R10) < 230. Satisfying the above ranges, by reasonably setting the surface shape of the fourth lens and the fifth lens, the light rays can be smoothly transitioned, the correction of aberration of the optical lens is facilitated, and the imaging quality of the optical lens is improved. More specifically, -0.01 < (R7-R8) / (R7+R8) < 0.07; -45.64 < (R9+R10) / (R9-R10) < 214.75.

[0073] In some embodiments, the object-side surface sagittal height Sag5 of the third lens and the object-side surface half-aperture diameter d5 of the third lens satisfy: -0.28 < Sag5 / d5 < -0.21; the image-side surface sagittal height Sag6 of the third lens and the image-side surface half-aperture diameter d6 of the third lens satisfy: -0.33 < Sag6 / d6 < -0.21. Satisfying the above ranges, the trend of the edge field of view light rays can be controlled, and the detail information of the central field of view of the projection lens is highlighted.

[0074] 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 by satisfying the above condition. More specifically, 58.38° < (f x FOV) / IH < 61.85°.

[0075] 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 < -2. By satisfying the above condition, the first lens has an appropriate negative focal length, which is conducive to expanding the field of view of the optical lens. More specifically, -2.54 < f1 / f < -2.17.

[0076] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 2.5 < f2 / f < 3.6; the object side surface radius of curvature R3 of the second lens and the effective focal length f of the optical lens satisfy: 4 < R3 / f < 8; and the image side surface radius of curvature R4 of the second lens and the effective focal length f of the optical lens satisfy: -9 < R4 / f < -3.4. By satisfying the above conditions, the second lens converges light rays to shorten the total length of the system and compensate for the aberration generated by the front group. More specifically, 2.78 < f2 / f < 3.36; 4.25 < R3 / f < 7.38; and -8.72 < R4 / f < -3.62.

[0077] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.6 < f6 / f < 2.4; the object side surface radius of curvature R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.75 < R11 / f < 0.95; and the image side surface radius of curvature R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 2 < R12 / f < 2.8. By satisfying the above conditions, by reasonably setting the focal length and the surface shape of the sixth lens, the light rays are smoothly transitioned, the correction of the aberration is facilitated, the imaging quality of the optical lens is improved, and the stability of the optical system is ensured. More specifically, 1.75 < f6 / f < 2.26; 0.8 < R11 / f < 0.93; and 2.1 < R12 / f < 2.59.

[0078] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: 10.5 < f5 / f6 < 30; the focal length f1 of the first lens and the focal length f6 of the sixth lens satisfy: -1.5 < f1 / f6 < -0.9. Satisfying the above ranges is conducive to smooth transition of light rays, correction of aberration of the optical lens, and improvement of imaging quality of the optical lens. More specifically, 11.29 < f5 / f6 < 28.86; -1.44 < f1 / f6 < -0.96.

[0079] In some embodiments, the optical lens satisfies the condition: 3.2mm < f < 3.6mm, 2.5mm < EPD < 3mm, 28mm < TTL < 31mm, 1.1 < Fno < 1.3, 2.8° < CRA < 5.4°, 2mm < BFL < 2.5mm, 130° < FOV < 150°, 7.5mm < IH < 8mm; where f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total track length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the real image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments has at least the following characteristics: short focal length and wide angle, deep depth of field of the short focal length lens, and relatively clear image of the subject in front and behind; super large field of view angle, which provides a wider shooting field of view for laser radar lens and other application scenarios and captures more image information; large imaging surface, which can match a large size chip to realize high-definition imaging; and large aperture, which can realize high-definition imaging even in a complex light environment. More specifically, 3.3mm < f < 3.49mm, 2.75mm < EPD < 2.91mm, 29.08mm < TTL < 30.01mm, 1.19 < Fno < 1.21, 3.02° < CRA < 4.99°, 2.14mm < BFL < 2.44mm, 139° < FOV < 141°, 7.87mm < IH < 7.94mm.

[0080] 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 second lens in the optical lens provided by the present application can be made of glass, and the third lens, the fourth lens, the fifth lens and the sixth lens can be made of plastic. The glass-plastic hybrid structure can effectively reduce the cost, correct the aberration, reduce the volume, improve the thermal stability, and provide an optical lens product with higher cost performance.

[0081] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the first lens and the second lens of the present application adopt a spherical lens, and the third lens, the fourth lens, the fifth lens and the sixth lens adopt an aspherical lens.

[0082] 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:

[0083] ;

[0084] 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 respectively the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order and sixteenth-order surface coefficients.

[0085] The present application is further described in the following embodiments. In various embodiments, the thickness, the radius of curvature and 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 preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any changes, substitutions, combinations or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement methods, and are included in the protection scope of the present application.

[0086] Embodiment 1

[0087] Please refer to Figure 1 , which is a structural schematic diagram of an optical lens 100 provided in the embodiment 1 of the present application. The optical lens 100 includes, along the optical axis from the object side to the imaging surface, 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 and a filter G1.

[0088] The first lens L1 has a negative focal power, the object side surface S1 thereof is a convex surface, and the image side surface S2 thereof is a concave surface;

[0089] The second lens L2 has a positive focal power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a convex surface;

[0090] The third lens L3 has a negative focal power, the object side surface S5 thereof is a concave surface, and the image side surface S6 thereof is a convex surface;

[0091] The fourth lens L4 has positive refractive power, the object side S7 is a convex surface, and the image side S8 is a concave surface;

[0092] The fifth lens L5 has positive refractive power, the object side S9 is a convex surface, and the image side S10 is a concave surface;

[0093] The sixth lens L6 has positive refractive power, the object side S11 is a convex surface, and the image side S12 is a concave surface;

[0094] The object side S13 and the image side S14 of the filter G1 are both flat surfaces;

[0095] The imaging surface S15 is a flat surface.

[0096] The first lens L1 and the second lens L2 are glass spherical lenses, and the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are 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] In this embodiment, the field curvature curve, the F-Theta distortion curve, the vertical axis chromatic aberration curve, the axial aberration curve, and the relative luminance curve of the optical lens 100 are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6

[0104] Figure 2 The field curvature curve of Embodiment 1 is shown, which represents the bending degree of light rays on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half 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 ±0.09 mm, which shows that the optical lens can well correct the field curvature.

[0105] Figure 3 ​The F-Theta distortion curve of the embodiment 1 is shown, which represents the F-Theta distortion of the light rays at different image heights on the imaging plane, the horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within-5%~3%, which shows that the optical lens can well correct the distortion.

[0106] Figure 4 The axial chromatic aberration curve of the embodiment 1 is shown, which represents the axial chromatic aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial chromatic 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 chromatic aberration is controlled within-0.03mm~0.02mm, which shows that the optical lens can well correct the axial chromatic aberration.

[0107] Figure 5 The axial chromatic aberration curve of the embodiment 1 is shown, which represents the axial chromatic aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial chromatic 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 chromatic aberration is controlled within-0.03mm~0.02mm, which shows that the optical lens can well correct the axial chromatic aberration.

[0108] Figure 6 The relative illumination curve of the embodiment 1 is shown, which represents the relative illumination value of different field 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 78% at the maximum half field angle, which shows that the optical lens has very good relative illumination.

[0109] Embodiment 2

[0110] Please refer to Figure 7 , 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 difference lies in that the optical parameters such as the curvature radius of each lens surface and the lens thickness 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-Theta distortion curve, the axial chromatic aberration curve, the axial aberration curve and the relative illumination curve of the optical lens 200 are shown in Figures 2-1, 2-2, 2-3, 2-4 and 2-5 respectively. Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12

[0118] As can be seen from Figure 2-1, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.15mm~0.08mm, which indicates that the optical lens can well correct the field curvature. Figure 8

[0119] As can be seen from Figure 2-2, the F-Theta distortion of the optical lens is controlled within -6%~2%, which indicates that the optical lens can well correct the distortion. Figure 9

[0120] As can be seen from Figure 2-3, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, which indicates that the optical lens can well correct the chromatic aberration. Figure 10

[0121] As can be seen from Figure 2-4, the offset of the axial aberration is controlled within -0.02mm~0.02mm, which indicates that the optical lens can well correct the axial aberration. Figure 11

[0122] As can be seen from Figure 2-5, the relative illumination value of the optical lens is still greater than 78% at the maximum half field of view, which indicates that the optical lens has very good relative illumination. Figure 12

[0123] Embodiment 3

[0124] Please refer to Figure 3-1, which shows the structural schematic diagram of the optical lens 300 provided in the embodiment 3 of the present application. Compared with the embodiment 1, the difference between the embodiment 3 and the embodiment 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different. Figure 13

[0125] The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0126] Table 3-1

[0127]

[0128] The surface type parameters of the aspheric lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0129] Table 3-2

[0130] ​​​​​​​

[0131] In this embodiment, the field curvature curve, F-Theta distortion curve, transverse chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 300 are respectively as follows: Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 As shown.

[0132] from Figure 14 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.08mm to 0.12mm, indicating that the optical lens can effectively correct the field curvature.

[0133] from Figure 15 As can be seen, the F-Theta distortion of the optical lens is controlled within -8% to 0, indicating that the optical lens can effectively correct distortion.

[0134] from Figure 16 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±3μm, indicating that the optical lens can effectively correct chromatic aberration.

[0135] from Figure 17 As can be seen, the axial aberration offset is controlled within 0~0.08mm, indicating that the optical lens can effectively correct axial aberration.

[0136] from Figure 18 As can be seen, the relative illumination value of the optical lens is still greater than 78% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0137] Example 4

[0138] Please see Figure 19 The figure shown is a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0139] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0140] Table 4-1

[0141]

[0142] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0143] Table 4-2

[0144]

[0145] In this embodiment, the field curvature curve, F-Theta distortion curve, transverse chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 400 are respectively as follows: Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 As shown.

[0146] from Figure 20 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.2mm, indicating that the optical lens can effectively correct the field curvature.

[0147] from Figure 21 As can be seen, the F-Theta distortion of the optical lens is controlled within -2% to 5%, indicating that the optical lens can effectively correct distortion.

[0148] from Figure 22 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±3μm, indicating that the optical lens can effectively correct chromatic aberration.

[0149] from Figure 23 As can be seen, the axial aberration offset is controlled within -0.04mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0150] from Figure 24 As can be seen, the relative illumination value of the optical lens is still greater than 78% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0151] Please refer to Tables 5-1 and 5-2 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, and maximum field of view FOV, as well as the values ​​corresponding to each conditional expression in each embodiment.

[0152] Table 5-1

[0153]

[0154] Table 5-2

[0155]

[0156] In summary, the optical lens provided by the present application adopts six lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of large aperture, short focal length, super-large field of view, high imaging quality, and the like.

[0157] 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 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.

[0158] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to 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 having six pieces of lenses with optical power, characterized in that, In order from the object side to the imaging surface along the optical axis, comprises successively: a first lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex; a third lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; a fourth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fifth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a sixth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; wherein the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2 2. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field angle of the optical lens satisfy: 0.9 3. The optical lens of claim 1, wherein, The optical total length TTL of the optical lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 18 4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -55 5. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 11 The object side surface curvature radius R7 of the fourth lens and the effective focal length f of the optical lens satisfy: 1 6. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 23 < f5 / f < 60; a curvature radius R9 of an object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 2.4 < R9 / f < 3; a curvature radius R10 of an image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 2.2 < R10 / f < 3.

1.

7. The optical lens of claim 1, wherein, A combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 2.3 < f12 / f < 5; the combined focal length f12 of the first lens and the second lens and a combined focal length f56 of the fifth lens and the sixth lens satisfy: 1 < f12 / f56 < 2.

4.

8. The optical lens of claim 1, wherein, A curvature radius R7 of an object side surface of the fourth lens and a curvature radius R8 of an image side surface of the fourth lens satisfy: |(R7-R8) / (R7+R8)| < 0.1; a curvature radius R9 of an object side surface of the fifth lens and a curvature radius R10 of an image side surface of the fifth lens satisfy: -50 < (R9+R10) / (R9-R10) < 230.

9. The optical lens of claim 1, wherein, A sagittal height Sag5 of a half light entrance radius of an object side surface of the third lens and the half light entrance radius d5 of the object side surface of the third lens satisfy: -0.28 < Sag5 / d5 < -0.21; a sagittal height Sag6 of a half light entrance radius of an image side surface of the third lens and the half light entrance radius d6 of the image side surface of the third lens satisfy: -0.33 < Sag6 / d6 < -0.21.

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