Optical lens

Abstract

The invention provides an optical lens, which comprises six lenses which sequentially comprise a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the object side surface of the second lens is a convex surface; the third lens has positive focal power; the fourth lens has negative focal power; the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface; and the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface. According to the optical lens provided by the invention, the six lenses with specific focal power are adopted, and through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be improved, and the lens has one or more advantages of large target surface, large aperture, high imaging quality and the like.

Description

Technical Field

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

[0002] As people's requirements for driving experience continue to increase, automotive optical lenses are increasingly used in intelligent driving, and the status of automotive optical lenses in the automotive-related industries continues to improve.

[0003] Advanced driver assistance systems (ADAS) play an important role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure the driver's driving safety. In addition to requiring the optical lens to be thin and short and have high pixels and high resolution, the existing ADAS system lens also requires the optical lens to be able to image clearly under low illumination conditions. Therefore, it is necessary to develop an optical lens with good imaging effect. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0005] The technical solution adopted by the present invention is:

[0006] An optical lens, comprising six lenses, which include:

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

[0008] a second lens having positive refractive power and a convex object-side surface;

[0009] a third lens having positive refractive power;

[0010] a fourth lens having negative optical power;

[0011] a fifth lens having positive refractive power and a convex object side surface;

[0012] The sixth lens element has negative refractive power and its image-side surface is concave.

[0013] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 <TTL / f<2.4。

[0014] Further preferably, 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: 0.55 <IH / f<0.7。

[0015] Further preferably, the total optical length TTL 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: 45<180°×TTL / IH / FOV<80.

[0016] Further preferably, the object side aperture D1 of the first 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: <D1 / IH / Tan(FOV / 2)<4.5。

[0017] Further preferably, the effective focal length f of the optical lens and the object side curvature radius R3 of the second lens satisfy: 0.9 <R3 / f<2.9。

[0018] Further preferably, the effective focal length f of the optical lens and the object side curvature radius R9 of the fifth lens satisfy: 0.2 <R9 / f<1.1。

[0019] Further preferably, the effective focal length f of the optical lens and the image side curvature radius R12 of the sixth lens satisfy: 0.3 <R12 / f<1.2。

[0020] Further preferably, a curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: -0.85<(R1-R2) / (R1+R2)<-0.2.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f<-1.1.

[0022] The optical lens provided by the present invention adopts six lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as a large target surface, a large aperture, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0025] Figure 2 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0026] Figure 3 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0027] Figure 4 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0028] Figure 5 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0030] Figure 7 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0031] Figure 8 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0032] Fig. 9 Schematic diagram of the structure of the optical lens in Example 9 of the present invention.

[0033] Fig.10 Schematic diagram of the structure of the optical lens in Example 10 of the present invention.

[0034] Fig.11 Schematic diagram of the structure of the optical lens in Example 11 of the present invention.

[0035] Fig.12 Schematic diagram of the structure of the optical lens in Example 12 of the present invention.

[0036] Fig.13 Schematic diagram of the structure of the optical lens in Example 13 of the present invention.

[0037] Fig.14 Schematic diagram of the structure of the optical lens in Example 14 of the present invention.

[0038] Fig.15 Schematic diagram of the structure of the optical lens in Example 15 of the present invention.

[0039] Fig.16 Schematic diagram of the structure of the optical lens in Example 16 of the present invention.

[0040] Fig.17 Schematic diagram of the structure of the optical lens in Example 17 of the present invention.

[0041] Fig.18 Schematic diagram of the structure of the optical lens in Example 18 of the present invention.

[0042] Fig.19 Schematic diagram of the structure of the optical lens in Example 19 of the present invention.

[0043] Fig. 20Schematic diagram of the structure of the optical lens in Example 20 of the present invention.

[0044] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0045] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0048] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0049] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The optical lens provided by the embodiment of the present invention comprises six lenses, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the object side to the imaging surface along the optical axis.

[0053] In some embodiments, the first lens may have a negative optical power, its object side surface is concave, and its image side surface is convex. The second lens may have a positive optical power, its object side surface is convex, and its image side surface may be concave or convex. The third lens may have a positive optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The fourth lens may have a negative optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The fifth lens may have a positive optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The sixth lens may have a negative optical power, its object side surface may be concave or convex, and its image side surface is concave.

[0054] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the first lens and the second lens. It is understood that the aperture is used to limit the amount of light entering to change the brightness of the image. When the aperture is located between the first lens and the second lens, it is convenient to correct the aperture aberration.

[0055] In some embodiments, the optical lens may further include a filter, which may be disposed 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.

[0056] In some embodiments, the third lens and the fourth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the processing technology of the optical lens and improving the assembly yield of the optical lens.

[0057] In some embodiments, the fourth lens and the fifth lens can be glued together to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0058] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 2.4. Meeting the above range is beneficial to limiting the total lens length while better realizing the long focal length performance of the system.

[0059] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view satisfy: 0.93 < (IH / 2) / (f × tan(FOV / 2)) < 1.05. Meeting the above range can control the size of distortion and improve the imaging quality of the optical lens.

[0060] In some embodiments, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the learned lens satisfy: 0.55 < IH / f < 0.7. Meeting the above range, controlling the image height and focal length of the optical lens within a reasonable range, helps the optical lens to have the characteristic of a large image plane and improves the imaging quality.

[0061] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.2 < BFL / f < 0.45. Meeting the above range limits the optical lens to have a suitable back focus, facilitates the reasonable arrangement of the positions of each lens, and reduces the processing and assembly difficulty at the same time.

[0062] In some embodiments, the total optical length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 45 < 180° × TTL / IH / FOV < 80. Meeting the above range is beneficial to balancing the relationship among the total length, image height, and field of view angle of the optical lens.

[0063] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis respectively satisfy: 0.5 < ∑CT / TTL < 0.8. Meeting the above range, reasonably configuring the total optical length of the optical lens and the sum of the thicknesses of each lens, helps to realize the high pixel characteristic and improve the imaging quality of the optical lens.

[0064] In some embodiments, the clear aperture D1 of the object side surface of the first lens, the true 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: 3 < D1 / IH / Tan(FOV / 2) < 4.5. Meeting the above range can balance the relationship between the front aperture diameter, the field of view angle, and the image plane size of the optical lens, which is beneficial to realizing miniaturization.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f < -1.1. Meeting the above range can make the first lens have a negative optical power, which is beneficial to reducing the inclination angle of the incident light, and is beneficial to collecting the marginal field light into the rear optical lens as much as possible to achieve large-angle light collection.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f > 0.9. Meeting the above range limits the second lens to have an appropriate positive optical power, which is beneficial to the convergence of light, enables the divergent light entering the system from the front to smoothly enter the rear optical system, makes the light trend smoother, optimizes the aberration, and improves the resolution.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.6 < f3 / f < 1.4. Meeting the above range limits the third lens to have an appropriate positive optical power, which can effectively correct the aberration generated at the front end of the lens and improve the imaging quality of the lens.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -1.9 < f4 / f < -0.3. Meeting the above range limits the fourth lens to have an appropriate negative optical power, which helps to increase the imaging area and improve the imaging quality.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.48 < f5 / f < 1.2. Meeting the above range limits the fifth lens to have an appropriate positive optical power, which helps to reduce the aberration of the optical lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.4 < f6 / f < -0.5. Meeting the above range limits the sixth lens to have an appropriate negative optical power, which is beneficial to increasing the imaging area of the optical lens, and at the same time can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens.

[0071] In some embodiments, the effective focal length f of the optical lens and the curvature radius R3 of the object side surface of the second lens satisfy: 0.9 < R3 / f < 2.9. By satisfying the above range and controlling the surface shape of the object side surface of the second lens, the light deflection angle can be reduced, the light trend can be made smoother, and the imaging quality of the optical lens can be improved.

[0072] In some embodiments, the effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.2 < R9 / f < 1.1. By satisfying the above range and reasonably defining the shape of the object side surface of the fifth lens, it is beneficial to reduce the distortion generated by the front-end lens and at the same time reduce the difficulty of distortion correction for the rear-end lens.

[0073] In some embodiments, the effective focal length f of the optical lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: 0.3 < R12 / f < 1.2. By satisfying the above range and reasonably defining the shape of the image side surface of the sixth lens, it is beneficial to increase the imaging area.

[0074] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -0.85 < (R1 - R2) / (R1 + R2) < -0.2. By satisfying the above range, it is beneficial to alleviate the deflection degree of the light passing through the first lens and can reduce the difficulty of aberration correction for the subsequent lenses.

[0075] In some embodiments, the optical lens satisfies the following conditional expressions: 14 mm < f < 16 mm; 30° < FOV < 40°; 9 mm < EPD < 10 mm; 22 mm < TTL < 35 mm; 1.5 < Fno < 1.8; 9 mm < IH < 10 mm; 18° < CRA < 23°; 3 mm < BFL < 6.5 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the overall optical length of the optical lens, FNO represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, and BFL represents the back focal length of the optical lens. By satisfying the above range, the optical lens has at least one or more advantages such as a large target surface, a large aperture, and a long focal length characteristic.

[0076] In some embodiments, the lens material in the optical lens provided by the present invention 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 optical lens provided by the present invention can adopt an all-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0077] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and reducing the size of lenses, and better realizing miniaturization of lenses. More specifically, the first lens, the third lens, the fourth lens, and the fifth lens of the present invention are spherical lenses, and the second lens and the sixth lens are aspherical lenses.

[0078] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0079]

[0080] Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, B, C, D, E, and F are the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients respectively.

[0081] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0082] Example 1

[0083] See also Figure 1 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, an aperture ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1.

[0084] The first lens L1 has negative refractive power, its object side surface S1 is concave, and its image side surface S2 is convex;

[0085] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex surfaces;

[0086] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0087] The fourth lens L4 has negative refractive power, and its object-side surface S6 and image-side surface S7 are both concave;

[0088] The third lens L3 and the fourth lens L4 form a cemented lens group, that is, the cemented surface between the image side surface of the third lens L3 and the object side surface of the fourth lens L4 is S6;

[0089] The fifth lens L5 has positive refractive power, and its object-side surface S8 and image-side surface S9 are both convex surfaces;

[0090] The sixth lens L6 has negative refractive power, its object-side surface S10 is convex, and its image-side surface S11 is concave;

[0091] The object side surface S12 and the image side surface S13 of the filter G1 are both planes;

[0092] The imaging surface S14 is a plane.

[0093] The second lens L2 and the sixth lens L6 are glass aspherical lenses, and the first lens L1, the third lens L3, the fourth lens L4, and the fifth lens L5 are glass spherical lenses.

[0094] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0095] Table 1-1

[0096]

[0097] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

[0098] Table 1-2

[0099]

[0100]

[0101] Example 2

[0102] See also Figure 2 , which is a schematic diagram of the structure of the optical lens provided in Example 2 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image side surface S9 of the fifth lens L5 is a concave surface; the object side surface S10 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0103] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

[0104] Table 2-1

[0105]

[0106] The surface parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.

[0107] Table 2-2

[0108] Face number K B C D E F S3 1.58E-01 0.00E+00 6.85E-07 1.91E-09 -2.68E-11 3.74E-12 S4 -2.87E+01 0.00E+00 2.06E-06 -3.39E-08 8.94E-10 -3.85E-12 S10 1.24E+01 -4.89E-03 2.29E-04 -1.06E-05 2.96E-07 -3.37E-09 S11 -1.38E+01 -4.18E-03 2.18E-04 -1.01E-05 2.67E-07 -2.90E-09

[0109] Example 3

[0110] See also Figure 3 , which is a schematic diagram of the structure of the optical lens provided in Example 3 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image side surface S6 of the third lens L3 is a concave surface; the third lens L3 and the fourth lens L4 are not a cemented lens group; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0111] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0112] Table 3-1

[0113]

[0114] The surface parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

[0115] Table 3-2

[0116] Face number K B C D E F S3 2.78E+00 0.00E+00 3.26E-06 -9.76E-08 4.00E-09 -3.18E-11 S4 -1.70E+00 0.00E+00 2.04E-06 3.12E-09 -9.09E-11 3.36E-11 S11 -7.40E+00 -7.37E-03 3.84E-04 -1.51E-05 4.20E-07 -5.16E-09 S12 5.47E-01 -8.30E-03 4.75E-04 -2.32E-05 6.86E-07 -9.54E-09

[0117] Example 4

[0118] See also Figure 4 , which is a schematic diagram of the structure of the optical lens provided in Example 4 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image side surface S6 of the third lens L3 is a concave surface; the object side surface S6 of the fourth lens L4 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0119] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0120] Table 4-1

[0121]

[0122] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0123] Table 4-2

[0124] Face number K B C D E F S3 -4.31E+00 0.00E+00 2.55E-06 -1.22E-07 3.46E-09 -2.64E-11 S4 -1.25E+00 0.00E+00 6.10E-07 9.57E-09 -5.98E-10 1.96E-11 S10 5.73E+01 -6.78E-03 3.90E-04 -1.55E-05 4.04E-07 -4.87E-09 S11 7.24E-01 -7.63E-03 4.68E-04 -2.32E-05 6.95E-07 -9.78E-09

[0125] Example 5

[0126] See also Figure 5, which is a schematic diagram of the structure of the optical lens provided in Example 5 of the present invention. Compared with Example 1, the main differences of this embodiment are: the object side surface S5 of the third lens L3 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0127] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0128] Table 5-1

[0129]

[0130]

[0131] The surface parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.

[0132] Table 5-2

[0133] Face number K B C D E F S3 -5.01E+01 0.00E+00 -1.07E-05 -3.47E-07 1.47E-08 -2.93E-10 S4 2.01E+00 0.00E+00 -9.87E-07 -1.67E-07 4.20E-09 -6.63E-11 S10 7.76E+01 -7.61E-03 4.57E-04 -2.06E-05 4.87E-07 -3.07E-09 S11 1.47E+00 -8.42E-03 5.20E-04 -2.82E-05 8.55E-07 -1.22E-08

[0134] Example 6

[0135] See also Figure 6 , which is a schematic diagram of the structure of an optical lens provided in Example 6 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the object-side surface S5 of the third lens L3 is a concave surface; the object-side surface S10 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0136] The relevant parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0137] Table 6-1

[0138]

[0139]

[0140] The surface parameters of the aspherical lens of the optical lens in Example 6 are shown in Table 6-2.

[0141] Table 6-2

[0142] Face number K B C D E F S3 -4.14E+00 0.00E+00 -2.52E-06 -1.04E-07 4.35E-09 -8.03E-11 S4 1.92E+00 0.00E+00 -4.72E-08 -1.26E-07 3.28E-09 -4.63E-11 S10 -1.39E+01 -6.96E-03 4.39E-04 -1.70E-05 4.24E-07 -5.02E-09 S11 6.00E+00 -6.84E-03 4.59E-04 -2.26E-05 6.93E-07 -1.01E-08

[0143] Example 7

[0144] See also Figure 7, which is a schematic diagram of the structure of an optical lens provided in Example 7 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image side surface S4 of the second lens L2 is a concave surface; the object side surface S10 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0145] The relevant parameters of each lens in the optical lens in Example 7 are shown in Table 7-1.

[0146] Table 7-1

[0147]

[0148]

[0149] The surface parameters of the aspherical lens of the optical lens in Example 7 are shown in Table 7-2.

[0150] Table 7-2

[0151] Face number K B C D E F S3 -1.27E+00 0.00E+00 7.92E-06 -2.94E-07 5.86E-09 -3.61E-11 S4 5.00E+01 0.00E+00 6.31E-06 -2.15E-07 4.14E-09 -1.65E-11 S10 -7.81E+01 -8.94E-04 8.34E-06 -2.81E-07 1.29E-08 -1.74E-10 S11 7.00E-01 -9.90E-04 2.64E-05 -1.47E-06 6.00E-08 -8.88E-10

[0152] Example 8

[0153] See also Figure 8 , which is a schematic diagram of the structure of the optical lens provided in Example 8 of the present invention. Compared with Example 1, the main differences of this embodiment are: the image side surface S4 of the second lens L2 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0154] The relevant parameters of each lens in the optical lens in Example 8 are shown in Table 8-1.

[0155] Table 8-1

[0156]

[0157]

[0158] The surface parameters of the aspherical lens of the optical lens in Example 8 are shown in Table 8-2.

[0159] Table 8-2

[0160] Face number K B C D E F S3 -1.39E+00 0.00E+00 8.15E-06 -2.95E-07 5.91E-09 -3.62E-11 S4 5.03E+01 0.00E+00 6.31E-06 -2.06E-07 4.01E-09 -1.51E-11 S10 -2.72E+01 -7.71E-04 2.73E-06 -1.98E-07 1.15E-08 -1.61E-10 S11 5.92E-01 -1.02E-03 1.51E-05 -1.11E-06 5.60E-08 -1.05E-09

[0161] Example 9

[0162] See also Fig. 9, which is a schematic diagram of the structure of the optical lens provided in Example 9 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image side surface S4 of the second lens L2 is a concave surface; the image side surface S6 of the third lens L3 is a concave surface; the object side surface S7 of the fourth lens L4 is a convex surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0163] The relevant parameters of each lens in the optical lens in Example 9 are shown in Table 9-1.

[0164] Table 9-1

[0165]

[0166]

[0167] The surface parameters of the aspherical lens of the optical lens in Example 9 are shown in Table 9-2.

[0168] Table 9-2

[0169] Face number K B C D E F S3 -2.14E+00 0.00E+00 7.41E-06 -2.83E-07 5.85E-09 -4.35E-11 S4 -5.10E+01 0.00E+00 5.69E-06 -2.17E-07 4.72E-09 -3.57E-11 S10 -8.03E+01 -8.26E-04 -1.57E-05 4.12E-08 9.85E-09 -1.60E-10 S11 -3.89E-01 -1.25E-03 1.28E-05 -1.40E-06 9.60E-08 -2.03E-09

[0170] Example 10

[0171] See also Fig.10 , which is a schematic diagram of the structure of the optical lens provided in Example 10 of the present invention. Compared with Example 1, the main differences of this embodiment are: the image side surface S4 of the second lens L2 is a concave surface; the image side surface S6 of the third lens L3 is a concave surface; the object side surface S7 of the fourth lens L4 is a convex surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0172] The relevant parameters of each lens in the optical lens in Example 10 are shown in Table 10-1.

[0173] Table 10-1

[0174]

[0175] The surface parameters of the aspherical lens of the optical lens in Example 10 are shown in Table 10-2.

[0176] Table 10-2

[0177] Face number K B C D E F S3 -4.04E+00 0.00E+00 5.17E-06 -2.77E-07 6.66E-09 -7.04E-11 S4 4.82E+01 0.00E+00 5.58E-06 -2.24E-07 5.07E-09 -5.33E-11 S10 -1.11E+01 -5.29E-04 -2.50E-06 1.30E-07 4.01E-09 -1.24E-10 S11 -9.91E-01 -1.05E-03 1.55E-05 -8.38E-07 6.31E-08 -1.64E-09

[0178] Embodiment 11

[0179] See also Fig.11, shown is a schematic diagram of the structure of the optical lens provided in Example 11 of the present invention. Compared with Example 1, the main differences of this embodiment are: the image side surface S6 of the third lens L3 is a concave surface; the object side surface S7 of the fourth lens L4 is a convex surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0180] The relevant parameters of each lens in the optical lens in Example 11 are shown in Table 11-1.

[0181] Table 11-1

[0182]

[0183] The surface parameters of the aspherical lens of the optical lens in Example 11 are shown in Table 11-2.

[0184] Table 11-2

[0185] Face number K B C D E F S3 -9.74E-01 0.00E+00 7.12E-06 -2.70E-07 6.01E-09 -4.63E-11 S4 -4.63E+01 0.00E+00 5.82E-06 -2.06E-07 4.67E-09 -3.34E-11 S10 -5.74E+01 -8.80E-04 -1.78E-05 -1.80E-08 2.04E-08 -3.36E-10 S11 -9.56E-01 -1.51E-03 2.42E-05 -1.82E-06 1.02E-07 -1.90E-09

[0186] Example 12

[0187] See also Fig.12 , shown is a schematic diagram of the structure of the optical lens provided in Example 12 of the present invention. Compared with Example 1, the main differences of this embodiment are: the image side surface S6 of the third lens L3 is a concave surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0188] The relevant parameters of each lens in the optical lens in Example 12 are shown in Table 12-1.

[0189] Table 12-1

[0190]

[0191] The surface parameters of the aspherical lens of the optical lens in Example 12 are shown in Table 12-2.

[0192] Table 12-2

[0193] Face number K B C D E F S3 -4.29E-01 0.00E+00 6.01E-06 -2.67E-07 5.99E-09 -5.13E-11 S4 -1.84E+01 0.00E+00 5.01E-06 -2.22E-07 5.05E-09 -4.38E-11 S10 -4.12E+00 -1.64E-03 -4.03E-06 -2.28E-07 -4.03E-08 1.94E-09 S11 -1.73E+00 -1.56E-03 3.25E-05 -2.77E-06 1.12E-07 -1.59E-09

[0194] Embodiment 13

[0195] See also Fig.13, shown is a schematic diagram of the structure of the optical lens provided in Example 13 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S6 of the third lens L3 is a concave surface; the object-side surface S10 of the sixth lens L6 is a concave surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0196] The relevant parameters of each lens in the optical lens in Example 13 are shown in Table 13-1.

[0197] Table 13-1

[0198]

[0199] The surface parameters of the aspherical lens of the optical lens in Example 13 are shown in Table 13-2.

[0200] Table 13-2

[0201] Face number K B C D E F S3 -3.46E-01 0.00E+00 6.02E-06 -2.67E-07 5.99E-09 -5.13E-11 S4 -1.68E+01 0.00E+00 5.02E-06 -2.21E-07 5.05E-09 -4.39E-11 S10 8.00E+01 -1.66E-03 -2.92E-06 -1.50E-07 -3.77E-08 1.88E-09 S11 -1.66E+00 -1.54E-03 3.33E-05 -2.75E-06 1.12E-07 -1.59E-09

[0202] Embodiment 14

[0203] See also Fig.14 , which is a schematic diagram of the structure of the optical lens provided in Example 14 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S6 of the third lens L3 is a concave surface; the object-side surface S10 of the sixth lens L6 is a concave surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0204] The relevant parameters of each lens in the optical lens in Example 14 are shown in Table 14-1.

[0205] Table 14-1

[0206]

[0207] The surface parameters of the aspherical lens of the optical lens in Example 14 are shown in Table 14-2.

[0208] Table 14-2

[0209] Face number K B C D E F S3 -4.20E-01 0.00E+00 6.04E-06 -2.66E-07 5.99E-09 -5.18E-11 S4 -1.57E+01 0.00E+00 5.06E-06 -2.21E-07 5.04E-09 -4.42E-11 S10 8.00E+01 -1.68E-03 -1.23E-06 -1.97E-07 -4.17E-08 1.99E-09 S11 -1.68E+00 -1.55E-03 3.19E-05 -2.64E-06 1.10E-07 -1.62E-09

[0210] Embodiment 15

[0211] See also Fig.15, which is a schematic diagram of the structure of the optical lens provided in Example 15 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image side surface S4 of the second lens L2 is a concave surface; the image side surface S7 of the fourth lens L4 is a convex surface; the object side surface S10 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0212] The relevant parameters of each lens in the optical lens in Example 15 are shown in Table 15-1.

[0213] Table 15-1

[0214]

[0215] The surface parameters of the aspherical lens of the optical lens in Example 15 are shown in Table 15-2.

[0216] Table 15-2

[0217] Face number K B C D E F S3 -4.51E+00 0.00E+00 5.74E-06 -2.57E-07 5.60E-09 -4.31E-11 S4 -1.41E+01 0.00E+00 5.47E-06 -2.13E-07 4.33E-09 -2.77E-11 S10 -8.16E+01 -1.78E-03 5.50E-05 -7.83E-07 1.04E-09 6.13E-11 S11 9.06E-01 -2.19E-03 6.94E-05 -2.75E-06 9.32E-08 -2.69E-09

[0218] Example 16

[0219] See also Fig.16 , shown is a schematic diagram of the structure of the optical lens provided in Example 16 of the present invention. Compared with Example 1, the main differences of this embodiment are: the object-side surface S10 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0220] The relevant parameters of each lens in the optical lens in Example 16 are shown in Table 16-1.

[0221] Table 16-1

[0222]

[0223] The surface parameters of the aspherical lens of the optical lens in Example 16 are shown in Table 16-2.

[0224] Table 16-2

[0225] Face number K B C D E F S3 -1.06E+01 0.00E+00 -4.38E-06 2.45E-07 -6.51E-09 6.93E-11 S4 5.01E+01 0.00E+00 -3.69E-06 2.02E-07 -4.87E-09 4.82E-11 S10 8.01E+01 -1.86E-03 6.79E-05 -1.21E-06 8.69E-09 7.56E-11 S11 1.75E-01 -2.18E-03 9.28E-05 -3.14E-06 8.48E-08 -1.41E-09

[0226] Embodiment 17

[0227] See also Fig.17 , which is a schematic diagram of the structure of the optical lens provided in Example 17 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image side surface S4 of the second lens L2 is a concave surface; the image side surface S7 of the fourth lens L4 is a convex surface; the image side surface S9 of the fifth lens L5 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0228] The relevant parameters of each lens in the optical lens in Example 17 are shown in Table 17-1.

[0229] Table 17-1

[0230]

[0231]

[0232] The surface parameters of the aspherical lens of the optical lens in Example 17 are shown in Table 17-2.

[0233] Table 17-2

[0234] Face number K B C D E F S3 -8.73E+00 0.00E+00 -4.50E-06 2.25E-07 -6.38E-09 7.27E-11 S4 -2.96E+01 0.00E+00 -4.24E-06 2.03E-07 -4.78E-09 4.84E-11 S10 -2.48E+01 -2.98E-03 9.15E-05 -1.42E-06 1.98E-08 -4.03E-10 S11 -2.85E+00 -2.06E-03 1.39E-04 -4.93E-06 1.69E-07 -3.51E-09

[0235] Embodiment 18

[0236] See also Fig.18 , which is a schematic diagram of the structure of the optical lens provided in Example 18 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the image side surface S4 of the second lens L2 is a concave surface; the image side surface S7 of the fourth lens L4 is a convex surface; the image side surface S9 of the fifth lens L5 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0237] The relevant parameters of each lens in the optical lens in Example 18 are shown in Table 18-1.

[0238] Table 18-1

[0239]

[0240]

[0241] The surface parameters of the aspherical lens of the optical lens in Example 18 are shown in Table 18-2.

[0242] Table 18-2

[0243] Face number K B C D E F S3 -1.20E+01 0.00E+00 -4.86E-06 2.22E-07 -6.26E-09 7.15E-11 S4 -4.90E+01 0.00E+00 -4.43E-06 1.82E-07 -4.06E-09 4.01E-11 S10 -2.23E+01 -3.30E-03 1.09E-04 -1.72E-06 1.66E-08 -2.67E-10 S11 -3.25E+00 -2.02E-03 1.42E-04 -4.73E-06 1.52E-07 -3.09E-09

[0244] Embodiment 19

[0245] See also Fig.19 , shown is a schematic diagram of the structure of the optical lens provided in Example 19 of the present invention. Compared with Example 1, the main differences of this embodiment are: the third lens L3 and the fourth lens L4 are not cemented lenses; the image side surface S6 of the third lens L3 is a concave surface; the image side surface S8 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0246] The relevant parameters of each lens in the optical lens in Example 19 are shown in Table 19-1.

[0247] Table 19-1

[0248]

[0249]

[0250] The surface parameters of the aspherical lens of the optical lens in Example 19 are shown in Table 19-2.

[0251] Table 19-2

[0252] Face number K B C D E F S3 1.42E+01 0.00E+00 1.35E-05 -9.64E-07 3.20E-08 -4.78E-10 S4 2.82E+00 0.00E+00 1.68E-06 -1.87E-07 7.31E-09 -1.61E-10 S11 1.83E-01 -1.29E-03 -1.34E-05 -7.20E-07 4.02E-08 -6.04E-10 S12 -6.30E-01 -1.54E-03 -2.57E-05 2.78E-07 5.76E-08 -1.60E-09

[0253] Embodiment 20

[0254] See also Fig. 20 , shown is a schematic diagram of the structure of the optical lens provided in Example 20 of the present invention. Compared with Example 1, the main differences of this embodiment are: the third lens L3 and the fourth lens L4 are not cemented lenses; the image side surface S6 of the third lens L3 is a concave surface; the image side surface S8 of the fourth lens L4 is a convex surface; the object side surface S11 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0255] The relevant parameters of each lens in the optical lens in Example 20 are shown in Table 20-1.

[0256] Table 20-1

[0257]

[0258]

[0259] The surface parameters of the aspherical lens of the optical lens in Example 20 are shown in Table 20-2.

[0260] Table 20-2

[0261] Face number K B C D E F S3 4.79E+00 0.00E+00 5.61E-06 -3.72E-07 1.03E-08 -1.27E-10 S4 -9.34E+00 0.00E+00 2.53E-06 -2.12E-07 5.83E-09 -8.25E-11 S11 -8.00E+01 -1.71E-03 2.03E-05 -1.77E-07 1.61E-08 -3.11E-10 S12 -3.84E-01 -1.85E-03 4.66E-05 -6.45E-07 -1.00E-08 6.80E-10

[0262] Please refer to Table 21, which shows the optical characteristics corresponding to the above-mentioned embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0263] Table 21-1

[0264]

[0265]

[0266] Table 21-2

[0267]

[0268]

[0269] In summary of the above embodiments, the optical lens provided by the present invention adopts six lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it is possible to improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as a large target surface, a large aperture, and high imaging quality.

[0270] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0271] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, comprising six lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: The first lens has a negative optical power, the object side surface of which is concave and the image side surface of which is convex; a second lens having positive refractive power and a convex object-side surface; a third lens having positive refractive power; a fourth lens having negative optical power; a fifth lens having positive refractive power and a convex object side surface; The sixth lens element has negative refractive power and its image-side surface is concave.

2. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 <TTL / f<2.4。 3. The optical lens according to claim 1, characterized in that: 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: 0.55 <IH / f<0.7。 4. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 45<180°×TTL / IH / FOV<80.

5. The optical lens according to claim 1, characterized in that: The object side aperture D1 of the first 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 the following conditions: <D1 / IH / Tan(FOV / 2)<4.5。 6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the object side curvature radius R3 of the second lens satisfy: 0.9 <R3 / f<2.9。 7. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the object side curvature radius R9 of the fifth lens satisfy: 0.2 <R9 / f<1.1。 8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the image side curvature radius R12 of the sixth lens satisfy: 0.3 <R12 / f<1.2。 9. The optical lens according to claim 1, characterized in that: A curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: -0.85<(R1-R2) / (R1+R2)<-0.

2.

10. 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: f1 / f<-1.1.

Images