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, and the image side surface of the first lens is a convex surface; a second lens with positive optical power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens with negative optical power, wherein 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; and a sixth lens with positive optical power. The optical lens provided by the application adopts six lenses with specific optical power, and 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, high imaging quality and the like.

Description

Technical Field

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

[0002] As people's demands for driving experience continue to increase, automotive optical lenses are being used more and more in intelligent driving, and the status of automotive optical lenses in the automotive industry is constantly rising.

[0003] Advanced Driver Assistance Systems (ADAS) play a crucial role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure driver safety. Existing ADAS lenses not only require a slim and compact design with high pixel count and high resolution, but also need to produce clear images in low-light conditions. Therefore, it is necessary to develop an optical lens with excellent imaging performance. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0005] The technical solution adopted in this invention is as follows:

[0006] An optical lens comprises six lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] The first lens with negative optical power has a concave object side and a convex image side.

[0008] A second lens with positive optical power has a convex object-side surface and a concave image-side surface;

[0009] The third lens with negative optical power has a concave image-side surface;

[0010] The fourth lens with positive optical power has convex surfaces on both its object side and image side.

[0011] A fifth lens with negative optical power;

[0012] A sixth lens with positive optical power.

[0013] Further preferably, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy: 2.2 <TTL / f<2.3。

[0014] Further preferably, the effective focal length f 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: 0.96 < (IH / 2) / (f×tan(FOV / 2)) < 1.01.

[0015] Further preferably, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.62 < IH / f < 0.66.

[0016] Further preferably, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.18 < BFL / f < 0.37.

[0017] Further preferably, 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: 69 < 180° × TTL / IH / FOV < 71.

[0018] Further preferably, the total optical length TTL of the optical lens and the sum of the center thicknesses of the first lens to the sixth lens along the optical axis, ∑CT, satisfy: 0.66 < ∑CT / TTL < 0.88.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6.6 <f1 / f<-4.5。

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.0 <f2 / f<1.4。

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -0.9 <f3 / f<-0.6。

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.5 <f4 / f<0.7。

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.8 <f5 / f<-0.7。

[0024] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.4 <f6 / f<9.9。

[0025] Further preferably, the effective focal length f of the optical lens and the radius of curvature R7 of the image-side surface of the fourth lens satisfy: -2.3 <R7 / f<-0.9。

[0026] Further preferably, the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy: -0.29 < (R1-R2) / (R1+R2) < -0.16.

[0027] More preferably, the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: -0.71 < (R3-R4) / (R3+R4) < -0.63.

[0028] More preferably, the object-side radius of curvature R10 of the sixth lens and the image-side radius of curvature R11 of the sixth lens satisfy: 0.01 < (R10-R11) / (R10+R11) < 0.38.

[0029] Further preferably, the object-side sagitta Sag1 of the first lens and the object-side radius of curvature R1 of the first lens satisfy: 0.08 < Sag1 / R1 < 0.13.

[0030] The optical lens provided by this invention uses six lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as large target surface, large aperture, and high imaging quality. Attached Figure Description

[0031] 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:

[0032] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0033] Figure 2 This is a field curvature curve of the optical mirror in Embodiment 1 of the present invention.

[0034] Figure 3 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0035] Figure 4 This is an MTF curve of the optical lens in Embodiment 1 of the present invention.

[0036] Figure 5 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0037] Figure 6 This is a field curvature curve of the optical mirror in Embodiment 2 of the present invention.

[0038] Figure 7 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0039] Figure 8 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0040] Figure 9 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0041] Figure 10 This is a field curvature curve of the optical mirror in Embodiment 3 of the present invention.

[0042] Figure 11 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0043] Figure 12 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0044] Figure 13 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0045] Figure 14 This is a field curvature curve of the optical mirror in Embodiment 4 of the present invention.

[0046] Figure 15 This is the F-Tan (Theta) distortion curve of the optical lens in Embodiment 4 of the present invention.

[0047] Figure 16 This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0048] Figure 17 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0049] Figure 18 This is a field curvature curve of the optical mirror in Embodiment 5 of the present invention.

[0050] Figure 19 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 5 of the present invention.

[0051] Figure 20 This is the MTF curve of the optical lens in Embodiment 5 of the present invention.

[0052] Figure 21 This is a schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0053] Figure 22 This is a field curvature curve of the optical mirror in Embodiment 6 of the present invention.

[0054] Figure 23 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 6 of the present invention.

[0055] Figure 24 This is an MTF curve of the optical lens in Embodiment 6 of the present invention.

[0056] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The optical lens provided in this embodiment of the invention includes 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.

[0065] In some embodiments, the first lens may have negative optical power, with its object-side surface being concave and its image-side surface being convex. The second lens may have positive optical power, with its object-side surface being convex and its image-side surface being concave. The third lens may have negative optical power, with its object-side surface being either concave or convex, and its image-side surface being concave. The fourth lens may have positive optical power, with both its object-side and image-side surfaces being convex. The fifth lens may have negative optical power, with its object-side surface being either concave or convex, and its image-side surface being either concave or convex. The sixth lens may have positive optical power, with its object-side surface being either concave or convex, and its image-side surface being either concave or convex.

[0066] In some embodiments, the optical lens may also 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 facilitates the correction of aperture aberrations.

[0067] 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 interfering light and prevent interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0068] In some embodiments, the third lens and the fourth 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.

[0069] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 2.3. Meeting the above range is beneficial to restricting the total lens length and achieving miniaturization.

[0070] In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.96 < (IH / 2) / (f×tan(FOV / 2)) < 1.01. Meeting the above range can control the optical lens to have small distortion and improve the imaging quality of the optical lens.

[0071] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.62 < IH / f < 0.66. Meeting the above range and 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 improve the imaging quality.

[0072] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.18 < BFL / f < 0.37. Meeting the above range limits the optical lens to have an appropriate back focal length, facilitates the reasonable arrangement of the positions of each lens, and at the same time reduces the processing and assembly difficulty.

[0073] In some embodiments, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 69 < 180°×TTL / IH / FOV < 71. Meeting the above range limits the length of the optical lens under the same imaging area and the same field angle, and achieves the miniaturization of the optical lens.

[0074] 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: 0.66 < ∑CT / TTL < 0.88. Meeting the above range and reasonably configuring the total optical length of the optical lens and the sum of the thicknesses of each lens helps to achieve the high-pixel characteristic and improve the imaging quality of the optical lens.

[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6.6 < f1 / f < -4.5. Meeting the above range can receive and diffuse the field light backward, and achieve a smooth transition of the light beam.

[0076] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.0 < f2 / f < 1.4. Meeting the above range can converge the light rays diverged by the first lens, which is beneficial to making the light ray trend transition smoothly and improving the imaging quality of the optical lens.

[0077] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -0.9 < f3 / f < -0.6. Satisfying the above range can receive and disperse the light rays from the second lens, increase the optical path of the light rays in the marginal field of view, and thus contribute to achieving a smooth transition of the light beam.

[0078] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.5 < f4 / f < 0.7. Satisfying the above range is conducive to light convergence. And the cooperation of the third lens with a negative optical power and the fourth lens with a positive optical power can adjust the optical path difference between different fields of view, improve the resolution, be conducive to making the light rays gently enter the rear lens, further reduce the field curvature, and correct the off-axis aberration of the optical lens.

[0079] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.8 < f5 / f < -0.7. Satisfying the above range, which defines that the fifth lens has a negative optical power, can diverge the light rays emitted by the fourth lens, make the light rays in the marginal field of view show an upward trend, and is conducive to the image points on the imaging surface being far from the optical axis, so as to be conducive to achieving the effect of matching with a large chip and obtaining a larger picture.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.4 < f6 / f < 9.9. Satisfying the above range, which defines that the sixth lens has a positive optical power, is conducive to light convergence, makes the light ray trend smoothly transition to the rear, reduces the height of the light rays incident on the rear, slows down the upward trend of the light rays, avoids the light energy loss caused by the excessive main ray angle of the large field of view light rays reaching the imaging surface, is conducive to improving the illuminance of the marginal field of view, and is conducive to achieving a short optical total length.

[0081] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the image side surface of the fourth lens satisfy: -2.3 < R7 / f < -0.9. Satisfying the above range can deflect the emitted light rays inward, which is conducive to reducing the rear port diameter, and thus can achieve miniaturization of the optical lens.

[0082] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: -0.29 < (R1 - R2) / (R1 + R2) < -0.16. Satisfying the above range can appropriately diverge the light rays collected by the large front aperture, which is conducive to correcting aberrations and improving the resolution ability of the optical lens.

[0083] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -0.71 < (R3 - R4) / (R3 + R4) < -0.63. By satisfying the above range, as much light as possible can be collected and enter the rear optical system, and the light can enter the rear optical system as smoothly as possible, which is beneficial to achieving low sensitivity and a small front aperture of the optical lens.

[0084] In some embodiments, the radius of curvature R10 of the object side surface of the sixth lens and the radius of curvature R11 of the image side surface of the sixth lens satisfy: 0.01 < (R10 - R11) / (R10 + R11) < 0.38. This can make the light converge quickly, minimize the total system length as much as possible, and achieve miniaturization; at the same time, it is beneficial to adjust the optical path difference between lights in different fields of view, which is beneficial to achieving small distortion, laying a foundation for subsequent light to converge better to the image plane, and achieving high resolution.

[0085] In some embodiments, the sagitta Sag1 of the object side surface of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy: 0.08 < Sag1 / R1 < 0.13. This is beneficial to collecting light in a large field of view, achieving high angular resolution at the center of the optical lens, and thus improving the imaging quality of the central region.

[0086] In some embodiments, the optical lens satisfies the following conditional expressions: 15.1mm < f < 15.4mm; 35° < FOV < 37°; 9.4mm < EPD < 9.7mm; 34.1mm < TTL < 34.3mm; 1.5 < Fno < 1.7; 9.6mm < IH < 9.9mm; 21.9° < CRA < 22.4°; 2.9mm < BFL < 5.5mm. 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 total 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 principal ray incident angle at the maximum image height 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.

[0087] 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.

[0088] In some embodiments, the first, second, third, fourth, fifth, and sixth lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first, third, fourth, and fifth lenses of this invention are spherical lenses, while the second and sixth lenses are aspherical lenses.

[0089] 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:

[0090]

[0091] 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 B, C, D, E, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0092] 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.

[0093] Example 1

[0094] 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.

[0095] Among them, the first lens L1 has negative optical power, its object side S1 is concave, and its image side S2 is convex.

[0096] The second lens L2 has positive optical power, its object side S3 is convex, and its image side S4 is concave.

[0097] The third lens L3 has negative optical power, its object side S5 is convex, and its image side S6 is concave.

[0098] The fourth lens L4 has positive optical power, and both its object-side surface S6 and image-side surface S7 are convex.

[0099] The third lens L3 and the fourth lens L4 form a cemented lens group, that is, the cemented surface of the image side of the third lens L3 and the object side of the fourth lens L4 is S6.

[0100] The fifth lens L5 has negative optical power, its object side S8 is convex, and its image side S9 is concave.

[0101] The sixth lens L6 has positive optical power, its object side S10 is convex, and its image side S11 is concave.

[0102] The object-side surface S12 and the image-side surface S13 of the filter G1 are both planar.

[0103] The imaging plane S14 is a plane.

[0104] The second lens L2 and the sixth lens L6 are glass aspherical lenses, while the first lens L1, the third lens L3, the fourth lens L4, and the fifth lens L5 are glass spherical lenses.

[0105] The relevant parameters of each lens in the optical lens of Example 1 are shown in Table 1-1.

[0106] Table 1-1

[0107]

[0108]

[0109] The surface profile parameters of the aspherical lens in Example 1 are shown in Table 1-2.

[0110] Table 1-2

[0111] Surface No. K B C D E F G S3 -2.31E+00 0.00E+00 2.09E-04 3.67E-07 7.98E-10 1.50E-10 -2.63E-13 S4 4.50E+00 0.00E+00 6.89E-05 2.92E-06 4.52E-08 -1.36E-09 2.92E-11 S10 -9.05E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 -5.09E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0112] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0113] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.05 mm, indicating that the optical lens can effectively correct the field curvature.

[0114] Figure 3The F-Tan (Theta) distortion curve of Example 1 is shown, which represents the distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion of the optical lens is controlled within ±2%, indicating that the optical lens can effectively correct distortion.

[0115] Figure 4 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 0.5 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, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0116] Example 2

[0117] Please see Figure 5 The figure shows a schematic diagram of the optical lens provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S5 of the third lens L3 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0118] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0119] Table 2-1

[0120]

[0121] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0122] Table 2-2

[0123] Surface No. K B C D E F G S3 -2.13E+00 0.00E+00 2.25E-04 4.33E-07 8.67E-09 4.96E-11 8.49E-13 S4 4.91E+01 0.00E+00 1.17E-04 1.33E-06 9.08E-08 -2.37E-09 4.20E-11 S10 -7.52E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 -1.87E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0124] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0125] from Figure 6 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0126] from Figure 7As can be seen, the distortion of the optical lens is controlled within ±2%, indicating that the optical lens can effectively correct distortion.

[0127] from Figure 8 As can be seen, the MTF value of this embodiment is above 0.5 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.

[0128] Example 3

[0129] Please see Figure 9 The figure shows a schematic diagram of the optical lens provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side S5 of the third lens L3 is concave; the object side S8 of the fifth lens L5 is concave and the image side S9 is convex; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0130] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0131] Table 3-1

[0132]

[0133] The surface profile parameters of the aspherical lens in Example 3 are shown in Table 3-2.

[0134] Table 3-2

[0135] Surface No. K B C D E F G S3 -2.07E+00 0.00E+00 2.38E-04 4.26E-07 5.74E-09 1.91E-10 -1.96E-13 S4 5.35E+01 0.00E+00 8.23E-05 5.30E-07 1.31E-07 -3.76E-09 7.36E-11 S10 -7.57E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 4.72E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0136] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0137] from Figure 10 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0138] from Figure 11 As can be seen, the distortion of the optical lens is controlled within ±2%, indicating that the optical lens can effectively correct distortion.

[0139] from Figure 12As can be seen, the MTF value of this embodiment is above 0.5 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.

[0140] Example 4

[0141] Please see Figure 13 The figure shows a schematic diagram of the optical lens provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S5 of the third lens L3 is concave; the object side surface S8 of the fifth lens L5 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0142] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0143] Table 4-1

[0144]

[0145]

[0146] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0147] Table 4-2

[0148] Surface No. K B C D E F G S3 -2.15E+00 0.00E+00 2.17E-04 2.12E-07 1.54E-08 -7.12E-11 1.16E-12 S4 4.73E+01 0.00E+00 5.93E-05 1.45E-06 1.14E-07 -2.96E-09 4.74E-11 S10 -1.39E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 3.83E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0149] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 14 , Figure 15 , Figure 16 As shown.

[0150] from Figure 14 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0151] from Figure 15 As can be seen, the distortion of the optical lens is controlled within ±2%, indicating that the optical lens can effectively correct distortion.

[0152] from Figure 16 As can be seen, the MTF value of this embodiment is above 0.5 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.

[0153] Example 5

[0154] Please see Figure 17 The figure shows a schematic diagram of the optical lens provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side S8 of the fifth lens L5 is concave and the image side S9 is convex; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0155] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0156] Table 5-1

[0157]

[0158]

[0159] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0160] Table 5-2

[0161] Surface No. K B C D E F G S3 -2.35E+00 0.00E+00 2.19E-04 1.98E-07 1.77E-09 1.16E-10 2.68E-13 S4 3.71E+01 0.00E+00 5.10E-05 -4.00E-07 1.29E-07 -3.46E-09 4.88E-11 S10 -9.25E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 6.71E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0162] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 18 , Figure 19 , Figure 20 As shown.

[0163] from Figure 18 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0164] from Figure 19 As can be seen, the distortion of the optical lens is controlled within ±2%, indicating that the optical lens can effectively correct distortion.

[0165] 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. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0166] Example 6

[0167] Please see Figure 21The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side S8 of the fifth lens L5 is concave and the image side S9 is convex; the object side S10 of the sixth lens L6 is concave and the image side S11 is convex; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0168] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0169] Table 6-1

[0170]

[0171] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0172] Table 6-2

[0173] Surface No. K B C D E F G S3 -2.69E+00 0.00E+00 4.61E-04 -4.06E-07 1.07E-08 4.23E-10 5.70E-12 S4 -6.90E-01 0.00E+00 2.27E-04 4.21E-06 5.87E-08 -3.62E-09 1.74E-10 S10 -8.00E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 6.80E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0174] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 22 , Figure 23 , Figure 24 As shown.

[0175] from Figure 22 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0176] from Figure 23 As can be seen, the distortion of the optical lens is controlled within ±4%, indicating that the optical lens can correct distortion well.

[0177] from Figure 24 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.

[0178] Please refer to Table 6 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 corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0179] Table 6

[0180] Parameter and Condition Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 f (mm) 15.16 15.13 15.26 15.14 15.30 15.38 FOV (°) 36.00 36.00 36.00 36.00 36.00 36.00 EPD (mm) 9.47 9.46 9.54 9.47 9.56 9.61 TTL (mm) 34.14 34.24 34.13 34.25 34.13 34.11 Fno 1.60 1.60 1.60 1.60 1.60 1.60 IH (mm) 9.81 9.82 9.79 9.82 9.78 9.65 CRA (°) 21.93 21.93 21.94 21.94 21.95 22.39 BFL (mm) 5.42 5.33 4.97 5.26 4.81 2.99 TTL / f 2.25 2.26 2.24 2.26 2.23 2.22 (IH / 2) / (f x Tan(FOV / 2)) 1.00 1.00 0.99 1.00 0.98 0.97 IH / f 0.65 0.65 0.64 0.65 0.64 0.63 BFL / f 0.36 0.35 0.33 0.35 0.31 0.19 180° x TTL / IH / FOV 69.63 69.76 69.70 69.77 69.80 70.72 ∑CT / TTL 0.67 0.72 0.78 0.79 0.79 0.87 f1 / f -4.51 -5.13 -6.55 -5.21 -4.96 -5.89 f2 / f 1.38 1.35 1.30 1.36 1.38 1.07 f3 / f -0.86 -0.77 -0.67 -0.75 -0.81 -0.68 f4 / f 0.67 0.68 0.60 0.66 0.61 0.55 f5 / f -1.69 -2.48 -2.73 -2.74 -1.81 -0.79 f6 / f 2.46 3.66 9.83 5.41 9.81 7.16 R7 / f -1.49 -1.23 -0.98 -1.12 -1.23 -2.25 (R1-R2) / (R1+R2) -0.19 -0.20 -0.17 -0.21 -0.20 -0.28 (R3-R4) / (R3+R4) -0.64 -0.65 -0.65 -0.65 -0.64 -0.70 (R10-R11) / (R10+R11) 0.02 0.05 0.10 0.08 0.09 0.37 Sag1 / R1 0.10 0.09 0.11 0.10 0.12 0.09

[0181] In summary, the optical lens provided by the present invention uses six lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as large target surface, large aperture, and high imaging quality.

[0182] 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.

[0183] 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: The first lens with negative optical power has a concave object side and a convex image side. A second lens with positive optical power has a convex object-side surface and a concave image-side surface; The third lens with negative optical power has a concave image-side surface; The fourth lens with positive optical power has convex surfaces on both its object side and image side. A fifth lens with negative optical power; A sixth lens with positive optical power; The total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy: 2.2 <TTL / f<2.3。 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 the condition: 2.22≤TTL / f<2.

26.

3. The optical lens according to claim 1, characterized in that, The effective focal length f 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 the following condition: 0.96 < (IH / 2) / (f × tan(FOV / 2)) < 1.

01.

4. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy the following condition: 0.62 < IH / f < 0.

66.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy the following condition: 0.18 < BFL / f < 0.

37.

6. 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 true image height (IH) corresponding to the maximum field of view of the optical lens satisfy the following condition: 69 < 180° × TTL / IH / FOV < 71.

7. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the sum of the center thicknesses of the first lens to the sixth lens along the optical axis, ∑CT, satisfy the following condition: 0.66 < ∑CT / TTL < 0.

88.

8. 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: -6.6 <f1 / f<-4.5。 9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.0 <f2 / f<1.4。 10. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy: -0.29 < (R1-R2) / (R1+R2) < -0.

16.

11. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: -0.71 < (R3-R4) / (R3+R4) < -0.

63.

12. The optical lens according to claim 1, characterized in that, The sagitta of the object side of the first lens, Sag1, and the radius of curvature of the object side of the first lens, R1, satisfy: 0.08 < Sag1 / R1 < 0.13.

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