Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence along an optical axis from an object side to an imaging surface, and the six lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a concave surface; a second lens with positive optical power, wherein the object side surface and the image side surface of the second lens are both convex surfaces; a third lens with positive optical power, wherein the object side surface of the third lens is a convex surface and the image side surface of the third lens is a concave surface; a fourth lens with positive optical power, wherein the object side surface and the image side surface of the fourth lens are both convex surfaces; a fifth lens with negative optical power, wherein the object side surface of the fifth lens is a concave surface; and a sixth lens with negative optical power. 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 optical lens have one or more advantages such as small aperture, large image surface, miniaturization and long-focus characteristics.

Description

TECHNICAL FIELD

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

[0002] In recent years, with the rapid development of automobile auxiliary driving technology, optical lenses are increasingly widely used in automobiles.

[0003] At present, higher requirements are put forward for the performance and structure of vehicle-mounted optical lenses for safety and other reasons. For example, due to the demand for updating iteration of the placement position of the lens, the installation position of the lens is limited, and the demand for miniaturization of the lens is increasingly intense. At the same time, the demand for large image surface and small aperture is also increasing, in order to realize high pixel requirements and improve the resolving power, seven, eight or more lens structures are usually selected, but this will seriously affect the miniaturization of the lens.

[0004] Therefore, how to make the optical lens realize large imaging size, small aperture, and long focal characteristics, etc., to meet the performance requirements of vehicle-mounted applications, is the goal pursued by the lens in the field. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages such as small aperture, large image surface, miniaturization, long focal characteristics, etc.

[0006] The present application provides an optical lens, which has a total of six lenses, and comprises, in order from the object side to the imaging surface along the optical axis:

[0007] a first lens with negative focal power, the object side surface of which is concave;

[0008] a second lens with positive focal power, both the object side surface and the image side surface of which are convex;

[0009] a third lens with positive focal power, the object side surface of which is convex and the image side surface of which is concave;

[0010] a fourth lens with positive focal power, both the object side surface and the image side surface of which are convex;

[0011] a fifth lens with negative focal power, the object side surface of which is concave;

[0012] a sixth lens with negative focal power.

[0013] Further preferably, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.8 < TTL / f < 2.2.

[0014] It is further preferred that the effective focal length f of the optical lens and the maximum field angle FOV and the real image height IH corresponding to the maximum field angle satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.02.

[0015] It is further preferred that the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.6 < IH / f < 0.68.

[0016] It is further preferred that the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 < BFL / f < 0.25.

[0017] It is further preferred that the real image height IH corresponding to the maximum field angle of the optical lens, the total optical length TTL and the maximum field angle FOV satisfy: 60.0 < 180° x TTL / (IH / 2) / (FOV / 2) < 70.0.

[0018] It is further preferred that the sum of the central thicknesses of the first lens to the sixth lens ∑CT and the total optical length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.7.

[0019] It is further preferred that the maximum field angle FOV of the optical lens, the real image height IH corresponding to the maximum field angle and the entrance pupil diameter D1 of the first lens satisfy: 3.2 < D1 / IH / tan(FOV / 2) < 4.0.

[0020] It is further preferred that the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.8 < f1 / f < -0.8.

[0021] It is further preferred that the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.9 < f2 / f < 1.4.

[0022] It is further preferred that the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < f3 / f < 4.3.

[0023] It is further preferred that the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.3 < f4 / f < 0.9.

[0024] It is further preferred that the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.9 < f5 / f < -0.5.

[0025] It is further preferred that the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.5 < f6 / f < -0.6.

[0026] Further preferably, an effective focal length f of the optical lens and a curvature radius R1 of the object side of the first lens satisfy: -1.1 < R1 / f < -0.7.

[0027] Further preferably, an effective focal length f of the optical lens and a curvature radius R9 of the object side of the fifth lens satisfy: -0.9 < R9 / f < -0.5.

[0028] Further preferably, a curvature radius R3 of the object side of the second lens and a curvature radius R4 of the image side satisfy: 2.0 < (R3-R4) / (R3+R4).

[0029] Further preferably, a curvature radius R5 of the object side of the third lens and a curvature radius R6 of the image side satisfy: -0.75 < (R5-R6) / (R5+R6) < -0.05.

[0030] Further preferably, a curvature radius R7 of the object side of the fourth lens and a curvature radius R8 of the image side satisfy: 10.0 < |(R7-R8) / (R7+R8)|.

[0031] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness, and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, long focal length, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0032] 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:

[0033] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0034] Figure 2 FIG. 2 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0035] Figure 3 FIG. 6 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0036] Figure 4 FIG. 7 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0037] Figure 5 FIG. 10 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0038] Figure 6 FIG. 11 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0039] The following detailed description will further explain the present application with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] For a better understanding of the present application, various aspects of the present application will be described in relation to the annexed drawings. It is stressed that these descriptions are only examples of embodiments of the present application, and are not meant in any way to restrict the scope of the application. Throughout the description, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

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

[0042] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly 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.

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

[0044] It is also to be understood that the use of the terms "including", "comprising", "having" and / or "containing" when used in this specification, particularly in the claims, means that existence of stated features, elements and / or components are present, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the use of the term "exemplary" is intended to present an example or an illustration. It is further understood that the use of relational terms such as "first", "second", "third", and the like, if any, are used solely to distinguish one from another entity or action without necessarily implying a strict order or sequence.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It 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.

[0046] 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 drawings and in combination with the embodiments.

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

[0048] In some embodiments, the first lens has a negative focal power, which is beneficial for diverging light rays. Under the same field of view angle condition, the light rays emitted from the image side of the first lens can make the subsequent optical system have a larger light ray acceptance surface, thereby reducing the front aperture. The object side of the first lens is a concave surface, which can diverge the light rays passing through the object side of the first lens, so that the subsequent optical system has a larger light ray acceptance surface.

[0049] In some embodiments, the second lens has a positive focal power, which is beneficial for converging light rays. In combination with the first lens having a negative focal power, the total length of the optical lens can be reduced, and the converging effect on the light rays can further reduce the rear aperture. The object side and the image side of the second lens are both convex surfaces, which can receive the diverged light rays from the first lens and make them smoothly enter the rear side; by moderately converging the front light rays, the light ray transition is smooth, the light ray energy loss is reduced, which is beneficial for preliminary aberration correction of the incident light rays, and is beneficial for realizing high resolution and improving the resolution capability of the optical lens.

[0050] In some embodiments, the third lens has a positive focal power, which is beneficial for receiving the converging light rays from the second lens, reducing the height of the light beam incident to the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens. The object side of the third lens is a convex surface, and the image side is a concave surface, which can reduce the angle between the incident light rays of the edge field of view and the surface normal of the object side, avoid light ray divergence, reduce sensitivity, and is also beneficial for correcting the aperture aberration, further improving the imaging quality of the optical lens, and can also diverge the emitted light rays, so that the light rays of the edge field of view have a higher height and a wider width when reaching the fourth lens, thereby improving the relative illumination of the edge field of view. The shape of the third lens is a crescent shape, and the difference between the changes of the two surfaces is small with temperature change, which is beneficial for realizing better thermal stability performance at high temperature.

[0051] In some embodiments, the fourth lens has positive refractive power, which is conducive to converging light rays, and in combination with the fifth lens, can effectively correct aberration of the optical lens, improve imaging quality, and optimize optical performance such as distortion. The object side and the image side of the fourth lens are both convex, which can compress light rays to smoothly and smoothly enter the fifth lens, reduce the sensitivity of the optical lens, and also enable the light rays to turn faster to reach the image plane, thereby reducing the overall length of the optical lens.

[0052] In some embodiments, the fifth lens has negative refractive power, which is conducive to diverging light rays, enabling the subsequent optical system to have a larger light acceptance surface, improving optical performance, and effectively correcting various aberrations caused by the front lens to improve the imaging quality of the optical lens. The object side of the fifth lens is concave, which can receive light rays from the fourth lens, continue to diverge after the object side of the fifth lens, enable the rear light rays to converge more slowly, and enable the light rays of the edge field of view to have an upward trend, thereby increasing the imaging area.

[0053] In some embodiments, the sixth lens has negative refractive power, which is conducive to diverging light rays, enabling the peripheral light rays and the central light rays to turn upward to reach a higher imaging position, and increasing the imaging area of the optical lens.

[0054] In some embodiments, the optical lens can further include a diaphragm, which can be located between the first lens and the third lens. It can be understood that the diaphragm is used to limit the amount of light entering to change the brightness of the image. When the diaphragm is located between the first lens and the third lens, it is conducive to effectively converging the light rays entering the optical lens, reducing the lens aperture of the rear end of the optical system, and reducing the sensitivity of the optical lens. However, it should be noted that the position of the diaphragm disclosed herein is only an example and not a limitation; in alternative embodiments, the diaphragm can also be arranged at other positions according to actual needs.

[0055] In some embodiments, the optical lens can further include a filter and / or a protective glass arranged between the sixth lens and the imaging plane, which can filter light rays with different wavelengths to prevent damage to the image side elements (e.g., a chip) of the optical lens.

[0056] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.8 < TTL / f < 2.2. Satisfying the above range means that the optical length of the optical lens can be effectively limited, which is conducive to realizing the miniaturization of the optical lens.

[0057] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.02. Satisfying the above range means that the optical distortion of the optical lens can be controlled within a smaller range, which is conducive to improving the imaging quality of the optical lens.

[0058] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: 0.6<IH / f<0.68. Satisfying the above range indicates that the optical lens can achieve a larger imaging surface, which is beneficial to improve the imaging quality of the optical lens.

[0059] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2<BFL / f<0.25. Satisfying the above range indicates that the optical lens has a longer back focus, which is beneficial to reduce the assembly of the interference module and improve the production yield.

[0060] In some embodiments, the real image height IH corresponding to the maximum field of view angle, the total optical length TTL of the optical lens, and the maximum field of view angle FOV satisfy: 60.0<180°xTTL / (IH / 2) / (FOV / 2)<70.0. Satisfying the above range can achieve a balance between large image height, long focal length, and miniaturization, and improve the imaging quality of the optical lens.

[0061] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the sixth lens and the total optical length TTL of the optical lens satisfy: 0.5<∑CT / TTL<0.7. Satisfying the above range is beneficial to compress the total length and volume of the optical lens and maintain the miniaturization of the optical lens.

[0062] In some embodiments, the maximum field of view angle FOV of the optical lens, the real image height IH corresponding to the maximum field of view angle, and the object side light entrance aperture D1 of the first lens satisfy: 3.2<D1 / IH / tan(FOV / 2)<4.0. Satisfying the above range can ensure that the front aperture size of the optical lens and the field of view angle and the image surface achieve a balance, and improve the imaging quality of the optical lens.

[0063] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.8<f1 / f<-0.8. Satisfying the above range is beneficial to diverge light rays, and under the same field of view angle condition, the light rays emitted from the image side of the first lens can make the subsequent optical system have a larger light acceptance surface, thereby reducing the front aperture.

[0064] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.9<f2 / f<1.4. Satisfying the above range is beneficial to converge light rays, and in combination with the first lens having negative optical power, the total length of the optical lens can be reduced, and the converging effect of the light rays can further reduce the rear aperture.

[0065] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < f3 / f < 4.3. Satisfying the above range is conducive to receiving light rays converged from the second lens, reducing the height of the light beam when incident to the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens.

[0066] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.3 < f4 / f < 0.9. Satisfying the above range is conducive to converging light rays, and in combination with the fifth lens, can effectively correct aberrations of the optical lens, improve imaging quality, and optimize optical performance such as distortion.

[0067] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.9 < f5 / f < -0.5. Satisfying the above range is conducive to diverging light rays, allowing the subsequent optical system to have a larger light acceptance surface, and effectively correcting various aberrations caused by the front lens to improve the imaging quality of the optical lens.

[0068] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.5 < f6 / f < -0.6. Satisfying the above range is conducive to diverging light rays, allowing peripheral light rays and central light rays to turn upward and reach a higher imaging position, thereby increasing the imaging area of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the object side radius of curvature R1 of the first lens satisfy: -1.1 < R1 / f < -0.7. Satisfying the above range can diverge light rays passing through the object side of the first lens, allowing the subsequent optical system to have a larger light acceptance surface.

[0070] In some embodiments, the effective focal length f of the optical lens and the object side radius of curvature R9 of the fifth lens satisfy: -0.9 < R9 / f < -0.5. Satisfying the above range can receive light rays from the fourth lens, continue to diverge after passing through the object side of the fifth lens, allow the rear light rays to converge slowly, and make the light rays of the edge field show an upward trend, thereby increasing the imaging area.

[0071] In some embodiments, the object side radius of curvature R3 and the image side radius of curvature R4 of the second lens satisfy: 2.0 < (R3-R4) / (R3+R4). Satisfying the above range can receive light rays diverged from the first lens and smoothly enter the rear; by moderately converging the front light rays, the light ray transition is smooth, the light energy loss is reduced, which is conducive to preliminary aberration correction of the incident light rays, and conducive to achieving high resolution and improving the resolution capability of the optical lens.

[0072] In some embodiments, the object-side surface radius of curvature R5 of the third lens and the image-side surface radius of curvature R6 satisfy: -0.75<(R5-R6) / (R5+R6)<-0.05. Satisfying the above range can reduce the angle of the edge field incident light and the normal of the object-side surface, avoid light divergence, reduce sensitivity, while being conducive to correcting the stop aberration, further improving the imaging quality of the optical lens, and can also diverge the emitted light, so that the edge field light has a higher height and a wider width when reaching the fourth lens, thereby improving the relative illumination of the edge field.

[0073] In some embodiments, the object-side surface radius of curvature R7 of the fourth lens and the image-side surface radius of curvature R8 satisfy: 10.0<|(R7-R8) / (R7+R8)|. Satisfying the above range can compress the light, make it smoothly incident to the fifth lens, reduce the sensitivity of the optical lens, and also enable the light to turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0074] In some embodiments, the fourth lens and the fifth 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. In addition, the glued lens can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0075] 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 the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0076] 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:

[0077]

[0078] 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 A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order curved surface coefficients, respectively.

[0079] The application will be further described in the following embodiments. In each embodiment, the thickness, radius of curvature, material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0080] Embodiment 1

[0081] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in embodiment 1 of the application, and the optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a diaphragm 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.

[0082] Among them, the first lens L1 has negative focal power, and the object side S1 and the image side S2 are both concave; the second lens L2 has positive focal power, and the object side S3 and the image side S4 are both convex; the third lens L3 has positive focal power, and the object side S5 is convex and the image side S6 is concave; the fourth lens L4 has positive focal power, and the object side S7 and the image side S8 are both convex; the fifth lens L5 has negative focal power, and the object side S8 is concave and the image side S9 is convex, and the fourth lens L4 and the fifth lens L5 form a cemented lens, and the cemented surface is S8; the sixth lens L6 has negative focal power, and the object side S10 is concave and the image side S11 is convex; the object side S12 and the image side S13 of the filter G1 are both flat; the imaging surface S14 is flat.

[0083] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses; the first lens

[0084] L1 and the sixth lens L6 are glass aspherical lenses.

[0085] The related parameters of each lens in the optical lens in embodiment 1 are shown in table 1-1.

[0086] Table 1-1

[0087]

[0088]

[0089] The surface type parameters of the aspherical lens of the optical lens in embodiment 1 are shown in table 1-2.

[0090] Table 1-2

[0091] Face number K A B C D E F S1 1.92E-01 0.00E+00 -4.44E-05 8.60E-07 -6.58E-08 3.09E-09 -4.58E-11 S2 6.84E+01 0.00E+00 3.30E-05 -2.97E-08 1.63E-08 -6.15E-12 -4.14E-12 S10 -1.35E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 -5.28E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0092] In the present embodiment, Figure 2 The MTF (Modulation Transfer Function) curve of the embodiment 1 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the present embodiment is above 0.4 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0093] Embodiment 2

[0094] Please refer to Figure 3 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application. Compared with the embodiment 1, the main difference of the present embodiment is that the aspheric lens is arranged, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0095] The related parameters of each lens in the optical lens in the embodiment 2 are shown in Table 2-1.

[0096] Table 2-1

[0097]

[0098]

[0099] The surface type parameters of the aspheric lens of the optical lens in the embodiment 2 are shown in Table 2-2.

[0100] Table 2-2

[0101] Face number K A B C D E F S3 -5.34E+00 0.00E+00 0.00E+00 1.55E-06 -1.19E-07 3.03E-09 -3.33E-11 S4 -6.19E-01 0.00E+00 0.00E+00 1.02E-06 -8.64E-08 2.35E-09 -2.80E-11 S10 8.00E+01 0.00E+00 -5.70E-03 1.49E-04 -5.21E-06 2.48E-07 -4.97E-09 S11 -8.06E+00 0.00E+00 -4.23E-03 1.66E-04 -6.42E-06 2.15E-07 -3.22E-09

[0102] It can be seen from Figure 4 that the MTF value of the present embodiment is above 0.5 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has excellent imaging quality and excellent detail resolution ability in the case of low frequency and high frequency.

[0103] Embodiment 3

[0104] Please refer to Figure 5 , which is a structural schematic diagram of the optical lens provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference of the present embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0105] The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0106] Table 3-1

[0107]

[0108]

[0109] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 3 are shown in Table 3-2.

[0110] Table 3-2

[0111] Face number K A B C D E F S3 6.35E+00 0.00E+00 -8.17E-06 2.66E-07 7.33E-08 -1.67E-09 2.44E-11 S4 -2.60E+00 0.00E+00 4.18E-05 -2.90E-07 1.49E-07 -4.02E-09 6.10E-11 S10 1.72E+01 0.00E+00 -4.92E-03 1.62E-04 -5.97E-06 1.99E-07 -3.07E-09 S11 2.69E+00 0.00E+00 -5.09E-03 1.93E-04 -8.90E-06 2.78E-07 -4.30E-09

[0112] As can be seen from Figure 6 , the MTF value of the present embodiment is above 0.5 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has excellent imaging quality and excellent detail resolution in both low and high frequency cases.

[0113] Please refer to Table 4 for the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH, and the maximum field of view angle FOV of the optical lens, and the numerical values corresponding to each conditional expression in each embodiment.

[0114] Table 4

[0115]

[0116]

[0117] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness, and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, long focal length, etc.

[0118] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction 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.

[0119] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, six pieces of lenses in total, characterized in that, In order from the object side to the imaging surface along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, the object side surface of which is a concave surface; a second lens with positive refractive power, both the object side surface and the image side surface of which are convex surfaces; a third lens with positive refractive power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a fourth lens with positive refractive power, both the object side surface and the image side surface of which are convex surfaces; a fifth lens with negative refractive power, the object side surface of which is a concave surface; a sixth lens with negative refractive power; the effective focal length f of the optical lens and the total track length TTL satisfy: 1.8 < TTL / f < 2.2; the object side surface curvature radius R5 and the image side surface curvature radius R6 of the third lens satisfy: -0.75 < (R5-R6) / (R5+R6) < -0.05; the effective focal length f of the optical lens, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f*Tan(FOV / 2)) < 1.

02.

2. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the total track length TTL satisfy: 1.98 ≤ TTL / f ≤ 2.

07.

3. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 0.6 < IH / f < 0.

68.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 < BFL / f < 0.

25.

5. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field of view, the total track length TTL and the maximum field of view FOV of the optical lens satisfy: 60.0 < 180°*TTL / (IH / 2) / (FOV / 2) < 70.

0.

6. The optical lens of claim 1, wherein, The sum of the central thicknesses of the first lens to the sixth lens ∑CT and the total track length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.

7.

7. The optical lens of claim 1, wherein, The maximum field of view FOV, the real image height IH corresponding to the maximum field of view and the object side surface light aperture D1 of the first lens of the optical lens satisfy: 3.2 < D1 / IH / tan(FOV / 2) < 4.

0.

8. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the object side surface curvature radius R1 of the first lens satisfy: -1.1 < R1 / f < -0.

7.

9. The optical lens of claim 1, wherein, The object side surface curvature radius R3 and the image side surface curvature radius R4 of the second lens satisfy: 2.0 < (R3-R4) / (R3+R4) ≤ 10.

85.

10. The optical lens of claim 1, wherein, The object side surface curvature radius R5 and the image side surface curvature radius R6 of the third lens satisfy: -0.70 ≤ (R5-R6) / (R5+R6) ≤ -0.07; The effective focal length f of the optical lens, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view satisfy: 0.96 ≤ (IH / 2) / (f*Tan(FOV / 2)) ≤ 0.99.

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