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; a second lens with positive optical power; a third lens with positive optical power; a fourth lens with positive optical power, the object side of the fourth lens is a convex surface; a fifth lens with negative optical power, the object side of the fifth lens is a convex surface, the image side of the fifth lens is a concave surface or the object side of the fifth lens is a concave surface and the image side of the fifth lens is a convex surface; and a sixth lens with negative optical power, the object side of the sixth lens is a concave surface and the image side of the sixth lens is a convex 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 optical lens have one or more advantages such as small aperture, large image surface, miniaturization and long focal length.

Description

Technical Field

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

[0002] In recent years, with the rapid development of automotive driver assistance technology, optical lenses have been used more and more widely in automobiles.

[0003] Currently, due to safety and other considerations, higher requirements are being placed on the performance and structure of automotive optical lenses. For example, as the needs for lens placement evolve and the available mounting spaces become limited, the demand for lens miniaturization is becoming increasingly urgent. At the same time, the demand for large image sensors and small apertures is also constantly increasing. To achieve higher pixel requirements and improve resolution, seven, eight, or even more lens elements are often used, but this severely impacts lens miniaturization.

[0004] Therefore, the goal pursued by this field is to enable optical lenses to achieve large imaging size, small aperture, and telephoto characteristics in order to meet the performance requirements of automotive applications. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide an optical lens that has one or more advantages such as small aperture, large image plane, miniaturization, and telephoto capability.

[0006] This invention provides an optical lens comprising six lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] A first lens with negative optical power;

[0008] A second lens with positive optical power;

[0009] A third lens with positive optical power;

[0010] The fourth lens has positive optical power and its object side is convex.

[0011] A fifth lens with negative optical power has an object-side surface that is convex and an image-side surface that is concave, or an object-side surface that is concave and an image-side surface that is convex.

[0012] The sixth lens has negative optical power, with a concave object side and a convex image side.

[0013] Further preferably, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.6 <TTL / f<2.5。

[0014] Further preferably, the effective focal length f of the optical lens and the maximum field of view FOV and the true image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f×Tan(FOV / 2)) < 1.05.

[0015] Further preferably, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 0.55 <IH / f<0.7。

[0016] Further preferably, the effective focal length f and the optical back focal length BFL of the optical lens satisfy: 0.2 <BFL / f<0.5。

[0017] Further preferably, the true image height IH, total optical length TTL, and maximum field of view FOV corresponding to the maximum field of view of the optical lens satisfy: 55.0 < 180° × TTL / (IH / 2) / (FOV / 2) < 80.0.

[0018] Further preferably, the sum of the center thicknesses of the first lens to the sixth lens, ∑CT, and the total optical length TTL of the optical lens satisfy the following condition: 0.5 < ∑CT / TTL < 0.75.

[0019] Further preferably, the maximum field of view (FOV) of the optical lens, the true image height (IH) corresponding to the maximum field of view, and the light transmission aperture (D1) of the object-side surface of the first lens satisfy: 3.0 <D1 / IH / tan(FOV / 2)<4.0。

[0020] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.7 <f1 / f<-0.8。

[0021] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.9 <f2 / f。

[0022] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.8 <f3 / f<1.8。

[0023] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.6 <f4 / f<1.3。

[0024] Further preferably, 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] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f < -0.6.

[0026] Further preferably, the effective focal length f of the optical lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: 0.45 <R7 / f<0.95。

[0027] Further preferably, the object-side radius of curvature R9 and the image-side radius of curvature R10 of the fifth lens satisfy: 0.5 < |(R9-R10) / (R9+R10)| < 0.9.

[0028] Further preferably, the object-side radius of curvature R11 and the image-side radius of curvature R12 of the sixth lens satisfy: -0.7<(R11-R12) / (R11+R12)<-0.1.

[0029] The optical lens provided by this invention improves the imaging quality, reduces aberrations, and enhances the imaging performance of the optical lens by optimizing the shape, power, thickness, and spacing of each lens. This results in the optical lens having one or more advantages such as small aperture, large image plane, miniaturization, and telephoto capabilities. Attached Figure Description

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0031] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0032] Figure 2 This is an MTF curve of the optical lens in Embodiment 1 of the present invention.

[0033] Figure 3 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0034] Figure 4 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 5 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 6 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 7 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0038] Figure 8 This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0039] Figure 9 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0040] Figure 10 This is the MTF curve of the optical lens in Embodiment 5 of the present invention.

[0041] Figure 11 This is a schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0042] Figure 12 This is the MTF curve of the optical lens in Embodiment 6 of the present invention.

[0043] Figure 13 This is a schematic diagram of the optical lens in Embodiment 7 of the present invention.

[0044] Figure 14 This is the MTF curve of the optical lens in Embodiment 7 of the present invention.

[0045] Figure 15 This is a schematic diagram of the optical lens in Embodiment 8 of the present invention.

[0046] Figure 16 This is the MTF curve of the optical lens in Embodiment 8 of the present invention.

[0047] Figure 17 This is a schematic diagram of the optical lens structure in Embodiment 9 of the present invention.

[0048] Figure 18 This is the MTF curve of the optical lens in Embodiment 9 of the present invention.

[0049] Figure 19 This is a schematic diagram of the optical lens in Embodiment 10 of the present invention.

[0050] Figure 20 This is the MTF curve of the optical lens in Embodiment 10 of the present invention.

[0051] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0052] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this 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.

[0053] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0054] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0055] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0056] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0057] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] The optical lens provided in this embodiment of the invention has a total of six lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

[0060] In some embodiments, the first lens has negative optical power, which is beneficial for diverging light. Under the same field of view, the light emitted from the image side of the first lens can provide a larger light receiving surface for the subsequent optical system and reduce the front port diameter.

[0061] In some embodiments, the second lens has positive optical power, which is beneficial for converging light. When paired with the first lens, which has negative optical power, it can reduce the overall length of the optical lens, and the converging effect on light can further reduce the rear port diameter.

[0062] In some embodiments, the third lens has positive optical power, which is beneficial for receiving light rays converged from the second lens, reducing the height of the beam incident on the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens.

[0063] In some embodiments, the fourth lens has positive optical power, which is beneficial for converging light. When paired with the fifth lens, it can effectively correct aberrations of the optical lens, improve image quality, and optimize optical performance such as distortion. The object-side surface of the fourth lens is convex, which can compress light and allow it to enter the fifth lens smoothly and steadily, reducing the sensitivity of the optical lens. It can also make the light bend and reach the image plane faster, thereby reducing the overall length of the optical lens.

[0064] In some embodiments, the fifth lens has negative optical power, which is beneficial for diverging light and provides a larger light-receiving surface for subsequent optical systems. This improved optical performance can effectively correct various aberrations introduced by the front lens and enhance the image quality of the optical lens. The object-side surface of the fifth lens is convex, and the image-side surface is concave, or the object-side surface is concave and the image-side surface is convex. The fifth lens is meniscus-shaped, and the difference in temperature between the two surfaces is small, which is beneficial for achieving better thermal stability at high temperatures.

[0065] In some embodiments, the sixth lens has negative optical power, which is beneficial for diverging light rays, causing peripheral and central rays to bend upwards and reach a higher imaging position, thereby increasing the imaging area of ​​the optical lens. The object side of the sixth lens is concave, and the image side is convex, which allows light rays to bend upwards, enabling peripheral rays to reach a higher imaging position, thus increasing the imaging area. At the same time, it can converge diverging light rays to the rear imaging surface, shortening the optical path of edge field rays to the imaging surface, and causing large-angle light rays to bend towards the optical axis after exiting, which is beneficial for reducing the lens aperture.

[0066] In some embodiments, the optical lens may further include an aperture stop, which may be located between the first lens and the second lens. It is understood that the aperture stop is used to limit the amount of light entering the lens to change the brightness of the image. When the aperture stop is located between the first lens and the second lens, it is beneficial to effectively converge the light entering the optical lens, reduce the lens aperture at the rear of the optical system, and decrease the sensitivity of the optical lens. However, it should be noted that the location of the aperture stop disclosed herein is merely an example and not a limitation; in alternative embodiments, the aperture stop may be placed in other locations as needed.

[0067] In some embodiments, the optical lens may further include a filter and / or a protective glass disposed between the sixth lens and the imaging surface, which can filter light rays with different wavelengths and prevent damage to the image-side components (e.g., chips) of the optical lens.

[0068] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.6 < TTL / f < 2.5. Meeting the above range indicates that the optical length of the optical lens can be effectively limited, which is beneficial to the miniaturization of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV, and the true image height IH corresponding to the maximum field angle satisfy: 0.95 < (IH / 2) / (f×Tan(FOV / 2)) < 1.05. Meeting the above range indicates that the optical distortion of the optical lens can be controlled within a small range, which is beneficial to improving the imaging quality of the optical lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle satisfy: 0.55 < IH / f < 0.7. Meeting the above range indicates that the optical lens can obtain a larger imaging surface, which is beneficial to improving the imaging quality of the optical lens.

[0071] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL satisfy: 0.2 < BFL / f < 0.5. Meeting the above range indicates that the optical lens has a longer back focal length, which is beneficial to reducing interference for the assembly of the module and improving the production yield.

[0072] In some embodiments, the true 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: 55.0 < 180°×TTL / (IH / 2) / (FOV / 2) < 80.0. Meeting the above range can achieve a balance among large image height, long focal length, and miniaturization, and improve the imaging quality of the optical lens.

[0073] In some embodiments, the sum ∑CT of the central thicknesses of the lenses from the first lens to the sixth lens and the total optical length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.75. Meeting the above range is beneficial to compressing the total length and volume of the optical lens and maintaining the miniaturization of the optical lens.

[0074] In some embodiments, the maximum field angle FOV of the optical lens, the true image height IH corresponding to the maximum field angle, and the clear aperture D1 of the object side surface of the first lens satisfy: 3.0 < D1 / IH / tan(FOV / 2) < 4.0. Meeting the above range can ensure a balance among the front aperture size, the field angle, and the image plane of the optical lens, and improve the imaging quality of the optical lens.

[0075] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.7 < f1 / f < -0.8. Meeting the above range is conducive to diverging light. Under the condition of the same field angle, the light rays exiting from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface and reduce the front aperture.

[0076] 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. Meeting the above range is conducive to converging light. When paired with the first lens having a negative optical power, it can reduce the total length of the optical lens, and the converging effect on light can further reduce the rear aperture.

[0077] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.8 < f3 / f < 1.8. Meeting the above range is conducive to receiving the converged light from the second lens, reducing the height of the light beam when it enters the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens.

[0078] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.6 < f4 / f < 1.3. Meeting the above range is conducive to converging light. When paired with the fifth lens, it can effectively correct the aberration of the optical lens, improve the imaging quality, and optimize optical performances such as distortion.

[0079] 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. Meeting the above range is conducive to diverging light, enabling the subsequent optical system to have a larger light receiving surface, and effectively correcting various aberrations brought by the front lenses to improve the imaging quality of the optical lens.

[0080] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f < -0.6. Meeting the above range is conducive to diverging light, causing the peripheral light rays and the central light rays to turn upwards, reaching a higher imaging position, and increasing the imaging area of the optical lens.

[0081] In some embodiments, the effective focal length f of the optical lens and the curvature radius R7 of the object side of the fourth lens satisfy: 0.45 < R7 / f < 0.95. Meeting the above range can compress the light rays, enabling them to smoothly enter the fifth lens, reducing the sensitivity of the optical lens, and also enabling the light rays to turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0082] In some embodiments, the object-side radius of curvature R9 and the image-side radius of curvature R10 of the fifth lens satisfy the following condition: 0.5 < |(R9-R10) / (R9+R10)| < 0.9. Meeting this range means that the difference in curvature between the two surfaces is small with temperature changes, which is beneficial for achieving better thermal stability at high temperatures; at the same time, it can optimize field curvature and improve the imaging quality of the optical lens.

[0083] In some embodiments, the object-side radius of curvature R11 and the image-side radius of curvature R12 of the sixth lens satisfy: -0.7 < (R11-R12) / (R11+R12) < -0.1. Satisfying this range allows light rays to be directed upwards, enabling peripheral light rays to reach a higher imaging position, which is beneficial for increasing the imaging area. At the same time, it enables divergent light rays to converge to the rear imaging surface, shortens the optical path of edge field rays to the imaging surface, and causes large-angle light rays to be deflected towards the optical axis after exiting, which is beneficial for reducing the lens aperture.

[0084] In some embodiments, the fourth lens and the fifth lens can be cemented together to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberrations 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.

[0085] In some embodiments, the first lens, second lens, third lens, fourth lens, fifth lens and sixth lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing lens miniaturization.

[0086] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0087]

[0088] Where 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 vertex of the surface, K is the quadratic surface coefficient, and A, B, C, D, E, and F are the second, fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0089] The present invention will be further described below with reference to several 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 tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0090] Example 1

[0091] Please see Figure 1 The diagram shows a schematic of the structure of an optical lens provided in Embodiment 1 of the present invention. The optical lens includes, along the optical axis from the object side to the imaging plane, the following components in sequence: 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.

[0092] The first lens L1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being convex; the second lens L2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex; the third lens L3 has positive optical power, with both its object-side surface S5 and its image-side surface S6 being convex; the fourth lens L4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave; the fifth lens L5 has negative optical power, with its object-side surface S8 being convex and its image-side surface S9 being concave, and the fourth lens L4 and the fifth lens L5 form a cemented lens with its cemented surface S8; the sixth lens L6 has negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being convex; the object-side surface S12 and the image-side surface S13 of the filter G1 are both planar; and the imaging surface S14 is planar.

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

[0094] L2 and the sixth lens L6 are glass aspherical lenses.

[0095] The relevant parameters of each lens in the optical lens of Example 1 are shown in Table 1-1.

[0096] Table 1-1

[0097]

[0098] The surface profile parameters of the aspherical lens in Example 1 are shown in Table 1-2.

[0099] Table 1-2

[0100] Face number K A B C D E F S3 4.05E+01 0.00E+00 0.00E+00 3.56E-06 1.04E-08 3.10E-10 -9.54E-12 S4 -5.01E+01 0.00E+00 0.00E+00 6.35E-06 -6.68E-08 2.56E-09 -2.66E-11 S10 -1.32E+00 0.00E+00 5.03E-03 -4.77E-05 -5.00E-06 2.21E-07 -3.18E-09 S11 -1.71E+00 0.00E+00 4.64E-03 2.94E-05 -5.45E-06 2.06E-07 -3.26E-09

[0101] In this embodiment, Figure 2 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.2 throughout the entire field of view. Within the range of 0–120 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, demonstrating acceptable imaging quality and acceptable detail resolution at both low and high frequencies.

[0102] Example 2

[0103] Please see Figure 3 The figure shown is a schematic diagram of the optical lens provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0104] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0105] Table 2-1

[0106]

[0107] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0108] Table 2-2

[0109]

[0110]

[0111] from Figure 4 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has qualified imaging quality and qualified detail resolution in both low and high frequency conditions.

[0112] Example 3

[0113] Please see Figure 5 The figure shown is a schematic diagram of the optical lens provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0114] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0115] Table 3-1

[0116]

[0117] The surface profile parameters of the aspherical lens in Example 3 are shown in Table 3-2.

[0118] Table 3-2

[0119] Face number K A B C D E F S3 -3.52E+00 0.00E+00 0.00E+00 -5.72E-06 2.59E-07 -7.61E-09 7.83E-11 S4 1.43E+01 0.00E+00 0.00E+00 -1.40E-06 2.54E-08 -6.60E-10 5.32E-12 S10 -2.12E+00 0.00E+00 2.60E-03 -9.93E-05 5.37E-06 -2.56E-07 4.83E-09 S11 -3.87E+00 0.00E+00 2.98E-03 -7.50E-05 6.07E-06 -3.08E-07 5.81E-09

[0120] from Figure 6 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has qualified imaging quality and qualified detail resolution in both low and high frequency conditions.

[0121] Example 4

[0122] Please see Figure 7 The figure shown is a schematic diagram of the optical lens provided in Embodiment 4 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0123] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0124] Table 4-1

[0125]

[0126] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0127] Table 4-2

[0128] Face number K A B C D E F S3 -3.39E+00 0.00E+00 0.00E+00 -5.79E-06 2.48E-07 -7.42E-09 7.54E-11 S4 1.69E+01 0.00E+00 0.00E+00 -1.43E-06 2.56E-08 -7.33E-10 6.07E-12 S10 -5.67E-01 0.00E+00 1.65E-03 -5.02E-05 6.62E-06 -3.40E-07 5.78E-09 S11 -4.84E+00 0.00E+00 1.67E-03 -5.18E-05 7.47E-06 -3.44E-07 5.46E-09

[0129] from Figure 8 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has qualified imaging quality and qualified detail resolution in both low and high frequency conditions.

[0130] Example 5

[0131] Please see Figure 9 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 5 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0132] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0133] Table 5-1

[0134]

[0135] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0136] Table 5-2

[0137] Face number K A B C D E F S3 -5.65E+00 0.00E+00 0.00E+00 -6.04E-06 2.06E-07 -6.10E-09 5.63E-11 S4 1.16E+01 0.00E+00 0.00E+00 -1.19E-06 1.20E-08 -2.76E-10 2.67E-12 S10 -9.52E-01 0.00E+00 2.54E-03 -7.01E-05 4.35E-06 -2.05E-07 3.50E-09 S11 -2.02E+00 0.00E+00 2.86E-03 -7.52E-05 6.42E-06 -2.84E-07 4.62E-09

[0138] from Figure 10 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0139] Example 6

[0140] Please see Figure 11 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 6 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0141] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0142] Table 6-1

[0143]

[0144]

[0145] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0146] Table 6-2

[0147] Face number K A B C D E F S3 -2.71E+00 0.00E+00 0.00E+00 -4.33E-06 2.99E-07 -9.44E-09 1.14E-10 S4 -4.91E+00 0.00E+00 0.00E+00 -7.98E-07 5.55E-08 -1.32E-09 1.22E-11 S10 6.29E+00 0.00E+00 -9.97E-04 -2.36E-05 6.99E-06 -2.73E-07 3.61E-09 S11 8.00E+01 0.00E+00 -3.63E-04 -3.67E-05 8.24E-06 -3.05E-07 4.45E-09

[0148] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has qualified imaging quality and qualified detail resolution in both low and high frequency conditions.

[0149] Example 7

[0150] Please see Figure 13The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 7 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0151] The relevant parameters of each lens in the optical lens of Example 7 are shown in Table 7-1.

[0152] Table 7-1

[0153]

[0154]

[0155] The surface profile parameters of the aspherical lens in Example 7 are shown in Table 7-2.

[0156] Table 7-2

[0157] Face number K A B C D E F S3 -1.92E+00 0.00E+00 0.00E+00 -7.91E-06 -3.05E-07 2.28E-09 -2.69E-11 S4 -5.71E-01 0.00E+00 0.00E+00 -1.14E-05 -9.69E-08 -1.42E-09 1.29E-10 S10 -1.71E+00 0.00E+00 3.36E-03 -2.24E-05 -3.88E-06 1.19E-07 -9.45E-10 S11 -2.86E+00 0.00E+00 3.99E-03 2.94E-06 -1.79E-06 1.45E-08 6.06E-10

[0158] from Figure 14 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0159] Example 8

[0160] Please see Figure 15 The figure shown is a schematic diagram of the optical lens provided in Embodiment 8 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0161] The relevant parameters of each lens in the optical lens of Example 8 are shown in Table 8-1.

[0162] Table 8-1

[0163]

[0164]

[0165] The surface profile parameters of the aspherical lens in Example 8 are shown in Table 8-2.

[0166] Table 8-2

[0167] Face number K A B C D E F S3 -4.71E+00 0.00E+00 0.00E+00 -5.54E-06 6.30E-08 -2.00E-09 -1.97E-12 S4 4.65E+01 0.00E+00 0.00E+00 -1.80E-06 -5.16E-08 8.27E-10 -4.62E-12 S10 6.13E+00 0.00E+00 -1.84E-03 -2.50E-05 3.29E-06 8.24E-08 -4.11E-09 S11 5.06E+01 0.00E+00 -1.26E-03 -6.83E-06 3.53E-06 -3.61E-08 1.14E-10

[0168] from Figure 16As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0169] Example 9

[0170] Please see Figure 17 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 9 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0171] The relevant parameters of each lens in the optical lens of Example 9 are shown in Table 9-1.

[0172] Table 9-1

[0173]

[0174]

[0175] The surface profile parameters of the aspherical lens in the optical lens of Example 9 are shown in Table 9-2.

[0176] Table 9-2

[0177] Face number K A B C D E F S3 -5.47E+00 0.00E+00 0.00E+00 -6.90E-06 5.70E-08 -1.45E-09 -1.90E-11 S4 2.33E+01 0.00E+00 0.00E+00 -2.71E-06 -8.40E-08 1.48E-09 -8.95E-12 S10 2.79E+01 0.00E+00 -1.07E-03 9.51E-06 -2.73E-06 4.03E-08 4.63E-09 S11 8.02E+01 0.00E+00 -3.26E-04 -2.02E-05 1.22E-06 -8.06E-08 3.60E-09

[0178] from Figure 18 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has qualified imaging quality and qualified detail resolution in both low and high frequency conditions.

[0179] Example 10

[0180] Please see Figure 19 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 10 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0181] The relevant parameters of each lens in the optical lens of Example 10 are shown in Table 10-1.

[0182] Table 10-1

[0183]

[0184] The surface profile parameters of the aspherical lens in the optical lens of Example 10 are shown in Table 10-2.

[0185] Table 10-2

[0186]

[0187]

[0188] from Figure 20 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0189] Please refer to Table 11 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH, and maximum field of view FOV of the optical lens, as well as the values ​​corresponding to each conditional expression in each embodiment.

[0190] Table 11

[0191]

[0192]

[0193] Continued from Table 11

[0194]

[0195] In summary, the optical lens provided by the present invention improves the imaging quality, reduces aberrations, and enhances the imaging quality of the optical lens by optimizing the shape, power, thickness, and spacing of each lens, thereby giving the optical lens one or more advantages such as small aperture, large image plane, miniaturization, and telephoto characteristics.

[0196] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0197] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising six lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: A first lens with negative optical power; A second lens with positive optical power; A third lens with positive optical power; The fourth lens has positive optical power and its object side is convex. A fifth lens with negative optical power has an object-side surface that is convex and an image-side surface that is concave, or an object-side surface that is concave and an image-side surface that is convex. The sixth lens with negative optical power has a concave object side and a convex image side. The effective focal length f and the total optical length TTL of the optical lens satisfy: 1.6 <TTL / f<2.5; The object-side radius of curvature R9 and the image-side radius of curvature R10 of the fifth lens satisfy: 0.5 < |(R9-R10) / (R9+R10)| < 0.9; The true image height IH, total optical length TTL, and maximum field of view FOV corresponding to the maximum field of view of the optical lens satisfy the following condition: 55.0 < 180° × TTL / (IH / 2) / (FOV / 2) < 80.

0.

2. The optical lens according to claim 1, characterized in that, The effective focal length f and the total optical length TTL of the optical lens satisfy the following condition: 1.76≤TTL / f≤2.

33.

3. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 0.55 <IH / f<0.7。 4. The optical lens according to claim 1, characterized in that, The effective focal length f and the optical back focal length BFL of the optical lens satisfy: 0.2 <BFL / f<0.5。 5. The optical lens according to claim 1, characterized in that, The true image height IH, total optical length TTL, and maximum field of view FOV corresponding to the maximum field of view of the optical lens satisfy the following: 55.16≤180°×TTL / (IH / 2) / (FOV / 2)≤76.

45.

6. The optical lens according to claim 1, characterized in that, The sum of the center thicknesses of the first lens to the sixth lens, ∑CT, and the total optical length TTL of the optical lens satisfy the following condition: 0.5 < ∑CT / TTL < 0.

75.

7. The optical lens according to claim 1, characterized in that, The maximum field of view (FOV) of the optical lens, the true image height (IH) corresponding to the maximum field of view, and the object-side aperture (D1) of the first lens satisfy the following condition: 3.0 <D1 / IH / tan(FOV / 2)<4.0。 8. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.9 <f2 / f≤6.88。 9. The optical lens according to claim 1, characterized in that, The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy the condition: -6.67≤f6 / f<-0.

6.

10. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R9 and the image-side radius of curvature R10 of the fifth lens satisfy the following condition: 0.59≤|(R9-R10) / (R9+R10)|≤0.

86.

11. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R11 and the image-side radius of curvature R12 of the sixth lens satisfy: -0.7 < (R11-R12) / (R11+R12) < -0.1.

Images