Optical lens

Abstract

The present invention provides an optical lens, which has a total of seven lenses. Along the optical axis from the object side to the imaging surface, they are successively: a first lens with a negative optical power, whose image side is concave; a second lens with a negative optical power, whose object side is concave and image side is convex; a third lens with a positive optical power, whose object side is convex; an aperture stop; a fourth lens with a positive optical power, whose object side and image side are both convex; a fifth lens with a positive optical power, whose object side and image side are both convex; a sixth lens with a negative optical power, whose object side is concave; a seventh lens with a negative optical power, whose object side is concave and image side is convex; the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle satisfy: 1.4 < IH / f < 1.6. The optical lens provided by the present invention improves the resolution of the optical lens, reduces aberration, and improves the imaging quality of the optical lens through the reasonable configuration of each lens surface type and the reasonable combination of optical powers.

Description

Technical Field

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

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

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

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

[0005] The present invention provides an optical lens, comprising seven lenses, which are arranged in order from the object side to the imaging surface along the optical axis:

[0006] a first lens having negative optical power and a concave image-side surface;

[0007] a second lens having negative optical power, whose object-side surface is concave and whose image-side surface is convex;

[0008] a third lens element having positive optical power and a convex object-side surface;

[0009] Aperture;

[0010] The fourth lens element has positive refractive power, and both the object-side surface and the image-side surface are convex;

[0011] The fifth lens has positive refractive power, and both the object-side surface and the image-side surface are convex;

[0012] a sixth lens element having negative optical power and a concave object-side surface;

[0013] The seventh lens element has a negative optical power, its object-side surface is concave and its image-side surface is convex;

[0014] The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.4 <IH / f<1.6。

[0015] Further preferably, the total optical length TTL and the effective focal length f of the optical lens meet the following conditions: 5.0 <TTL / f<8.0。

[0016] Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle meet the following requirements: 3.5 <TTL / IH<5.0。

[0017] Further preferably, the real image height IH and entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy the following relationship: 2.5 <IH / EPD<3.0。

[0018] Further preferably, the maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the clear aperture D1 of the object side of the first lens satisfy the following relationship: 1.2<D1 / IH / tan(FOV / 2)<1.9.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.5 <f1 / f<-1.5。

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 4.5 <f3 / f<7.0。

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 <f4 / f<2.0。

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.1 <f5 / f<1.7。

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.3 <f6 / f<-1.0。

[0024] The optical lens provided by the present invention improves the resolution of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens through the reasonable configuration of the surface shapes of each lens and the reasonable matching of the optical focal length. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0026] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0027] Figure 2 Graph showing the field curvature of the optical lens in Example 1 of the present invention.

[0028] Figure 3 This is the MTF curve of the optical lens in Example 1 of the present invention.

[0029] Figure 4 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

[0030] Figure 5 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0031] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0032] Figure 7 Graph showing the field curvature of the optical lens in Example 2 of the present invention.

[0033] Figure 8 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 9 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0035] Figure 10 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0036] Figure 11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0037] Figure 12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0038] Figure 13 This is the MTF curve of the optical lens in Example 3 of the present invention.

[0039] Figure 14 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0040] Figure 15 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0041] Figure 16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0042] Figure 17 4 is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0043] Figure 18 This is the MTF curve of the optical lens in Example 4 of the present invention.

[0044] Figure 19 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0045] Figure 20Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0046] Figure 21 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0047] Figure 22 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0048] Figure 23 This is the MTF curve of the optical lens in Example 5 of the present invention.

[0049] Figure 24 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0050] Figure 25 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0051] Figure 26 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0052] Figure 27 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention.

[0053] Figure 28 This is the MTF curve of the optical lens in Example 6 of the present invention.

[0054] Figure 29 Graph showing the axial aberration of the optical lens in Example 6 of the present invention.

[0055] Figure 30 Graph showing vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0056] Figure 31 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0057] Figure 32 4 is a field curvature curve diagram of the optical lens in Example 7 of the present invention.

[0058] Figure 33 This is the MTF curve of the optical lens in Example 7 of the present invention.

[0059] Figure 34 Graph showing the axial aberration of the optical lens in Example 7 of the present invention.

[0060] Figure 35 Graph showing vertical axis chromatic aberration of the optical lens in Example 7 of the present invention.

[0061] Figure 36 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0062] Figure 37 4 is a field curvature curve diagram of the optical lens in Example 8 of the present invention.

[0063] Figure 38 This is the MTF curve of the optical lens in Example 8 of the present invention.

[0064] Figure 39 4 is an axial aberration curve diagram of the optical lens in Example 8 of the present invention.

[0065] Figure 40 Graph showing vertical axis chromatic aberration of the optical lens in Example 8 of the present invention.

[0066] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0067] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0068] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0069] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0070] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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.

[0071] It should also be understood that the terms "comprising", "comprises", "having", "includes" and / or "including", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0072] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0073] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0074] The optical lens according to an embodiment of the present invention sequentially includes, along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter and a protective glass.

[0075] In some embodiments, the first lens may have a negative optical power, and its image side is concave; the second lens may have a negative optical power, its object side is concave, and its image side is convex; the third lens may have a positive optical power, and its object side is convex; the fourth lens may have a positive optical power, and both its object side and image side are convex; the fifth lens may have a positive optical power, and both its object side and image side are convex; the sixth lens may have a negative optical power, and its object side is concave; the seventh lens may have a negative optical power, its object side is concave, and its image side is convex.

[0076] 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: 1.4 < IH / f < 1.6. Meeting the above range can achieve high pixel characteristics and improve the imaging quality of the optical lens.

[0077] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f satisfy: 5.0 < TTL / f < 8.0. Meeting the above requirements ensures sufficient space for adjusting the lens structure and optimizing the imaging effect.

[0078] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle satisfy: 3.5 < TTL / IH < 5.0. Meeting the above range can effectively balance the requirements of a large image plane and the lens size of the optical lens.

[0079] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD satisfy: 2.5 < IH / EPD < 3.0. Meeting the above range can increase the width of the light beam entering the optical lens, improve the brightness at the image plane of the optical lens, and avoid vignetting.

[0080] In some embodiments, among 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, they satisfy: 1.2 < D1 / IH / tan(FOV / 2) < 1.9. Meeting the above range can ensure the balance between the size of the optical lens, the large field angle, and the large image plane.

[0081] 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: 0.7 < (IH / 2) / (f×tan(FOV / 2)) < 0.85. Meeting the above requirements indicates that the optical distortion of the optical lens is well controlled, improving the resolution of the optical lens.

[0082] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.5 < f1 / f < -1.5. Meeting the above requirements can endow the first lens with an appropriate negative optical power, which is beneficial to reducing the inclination angle of the incident light, thereby reducing the correction difficulty of various aberrations of the optical lens.

[0083] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -45.0 < f2 / f < -6.0. Meeting the above requirements can endow the second lens with an appropriate negative optical power, sharing the negative optical power at the front end of the optical lens, which is beneficial to avoiding excessive light deflection caused by the overly concentrated optical power of the first lens and reducing the difficulty of chromatic aberration correction of the optical lens.

[0084] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 4.5 < f3 / f < 7.0. Meeting the above requirements can endow the third lens with an appropriate positive optical power, reducing the light deflection angle while converging the light, making the light trend transition smoothly, and at the same time balancing various aberrations generated by the optical lens, improving the imaging quality of the optical lens.

[0085] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 < f4 / f < 2.0. Meeting the above requirements can endow the fourth lens with an appropriate positive optical power, reduce the light deflection angle while converging the light, enable the light to transition smoothly, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0086] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.1 < f5 / f < 1.7. Meeting the above requirements can endow the fifth lens with an appropriate positive optical power, reduce the light deflection angle while converging the light, enable the light to transition smoothly, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0087] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.3 < f6 / f < -1.0. Meeting the above requirements can endow the sixth lens with an appropriate negative optical power, increase the imaging area of the optical lens; at the same time, it can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens.

[0088] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -9.8 < f7 / f < -5.0. Meeting the above range can endow the seventh lens with an appropriate negative optical power and increase the imaging area of the optical lens.

[0089] In some embodiments, the Abbe number Vd of at least one of the fifth lens and the sixth lens satisfies: Vd > 80, and the Abbe number Vd5 of the fifth lens and the Abbe number Vd6 of the sixth lens satisfy: Vd5 - Vd6 > 60. Meeting the above range is conducive to achieving confocal for visible light and infrared light.

[0090] In some embodiments, the fifth lens and the sixth lens can be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0091] In some embodiments, the second lens, the fourth lens, and the seventh lens can all adopt the aspherical lens surface type to improve the resolution quality.

[0092] To enable the system to have better optical performance, multiple aspherical lenses are used in the lens, and the aspherical surface shapes of the optical lens satisfy the following equation:

[0093] ; Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients respectively.

[0094] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0095] Example 1

[0096] See also Figure 1 , shown is a schematic structural diagram of the optical lens provided in Example 1 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0097] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0098] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0099] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0100] Aperture ST;

[0101] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0102] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0103] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both concave;

[0104] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0105] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0106] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0107] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0108] The imaging surface S18 is a plane.

[0109] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0110] Table 1-1

[0111]

[0112] The surface parameters of the aspheric lens of the optical lens in Example 1 are shown in Table 1-2.

[0113] Table 1-2

[0114]

[0115] In this embodiment, the field curvature curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in FIG. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0116] Figure 2 The field curvature curves for Example 1 are shown, representing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0117] Figure 3 The MTF (Modulation Transfer Function) curve for Example 1 is shown. It represents the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.35 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edges of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0118] Figure 4The following graph shows the axial aberration curve for Example 1, which represents the aberration on the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within a range of -10μm to 20μm, indicating that the optical lens can effectively correct axial aberration.

[0119] Figure 5 The vertical chromatic aberration curve for Example 1 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -2 μm to 4.5 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0120] Example 2

[0121] See also Figure 6 , shown is a schematic structural diagram of an optical lens provided in Example 2 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0122] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0123] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0124] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0125] Aperture ST;

[0126] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0127] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0128] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both concave;

[0129] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0130] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0131] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0132] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0133] The imaging surface S18 is a plane.

[0134] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

[0135] Table 2-1

[0136]

[0137] The surface parameters of the aspheric lens of the optical lens in Example 2 are shown in Table 2-2.

[0138] Table 2-2

[0139]

[0140] In this embodiment, the field curvature curve MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are respectively as follows: Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 shown.

[0141] Figure 7 The field curvature curves for Example 2 are shown, representing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.02mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0142] Figure 8 The MTF (Modulation Transfer Function) curve for Example 2 is shown. It represents the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.4 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0143] Figure 9The following graph shows the axial aberration curve for Example 2, which plots the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within a range of -10 μm to 20 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0144] Figure 10 The vertical chromatic aberration curve for Example 2 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -1 μm to 4 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0145] Example 3

[0146] See also Figure 11 , shown is a schematic structural diagram of an optical lens provided in Example 3 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0147] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave;

[0148] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0149] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0150] Aperture ST;

[0151] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0152] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0153] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both concave;

[0154] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0155] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0156] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0157] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0158] The imaging surface S18 is a plane.

[0159] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0160] Table 3-1

[0161]

[0162] The surface parameters of the aspheric lens of the optical lens in Example 3 are shown in Table 3-2.

[0163] Table 3-2

[0164]

[0165] In this embodiment, the field curvature curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in FIG. Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 shown.

[0166] Figure 12 The field curvature curves for Example 3 are shown, showing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.02mm, indicating that the optical lens is able to effectively correct field curvature.

[0167] Figure 13 The MTF (Modulation Transfer Function) curve for Example 3 is shown. It represents the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.5 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0168] Figure 14The following graph shows the axial aberration curve for Example 3, which plots the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within a range of -10 μm to 20 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0169] Figure 15 The vertical chromatic aberration curve for Example 3 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -1 μm to 4 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0170] Example 4

[0171] See also Figure 16 , shown is a schematic structural diagram of an optical lens provided in Example 4 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0172] The first lens L1 has negative refractive power, its object-side surface S1 is flat, and its image-side surface S2 is concave;

[0173] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0174] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0175] Aperture ST;

[0176] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0177] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0178] The sixth lens L6 has negative refractive power, its object-side surface S10 is concave, and its image-side surface S11 is convex;

[0179] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0180] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0181] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0182] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0183] The imaging surface S18 is a plane.

[0184] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0185] Table 4-1

[0186]

[0187] The surface parameters of the aspheric lens of the optical lens in Example 4 are shown in Table 4-2.

[0188] Table 4-2

[0189]

[0190] In this embodiment, the field curvature curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in FIG. Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 shown.

[0191] Figure 17 The field curvature curves for Example 4 are shown, representing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0192] Figure 18 The MTF (Modulation Transfer Function) curve for Example 4 is shown. It represents the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.4 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edges of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0193] Figure 19The following graph shows the axial aberration curve for Example 4, which plots the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within a range of -10 μm to 25 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0194] Figure 20 The vertical chromatic aberration curve for Example 4 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -1 μm to 4 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0195] Example 5

[0196] See also Figure 21 , shown is a schematic structural diagram of an optical lens provided in Example 5 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0197] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0198] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0199] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0200] Aperture ST;

[0201] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0202] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0203] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both concave;

[0204] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0205] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0206] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0207] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0208] The imaging surface S18 is a plane.

[0209] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0210] Table 5-1

[0211]

[0212] The surface parameters of the aspheric lens of the optical lens in Example 5 are shown in Table 5-2.

[0213] Table 5-2

[0214]

[0215] In this embodiment, the field curvature curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in FIG. Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 shown.

[0216] Figure 22 The field curvature curves for Example 5 are shown, showing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.02mm to 0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0217] Figure 23 The MTF (Modulation Transfer Function) curve for Example 5 is shown. It represents the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.4 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the periphery of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0218] Figure 24The following graph shows the axial aberration curve for Example 5, which plots the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within a range of -10 μm to 20 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0219] Figure 25 The vertical chromatic aberration curve for Example 5 is shown. It shows the chromatic aberration of each wavelength relative to the central wavelength (0.55μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within a range of -1μm to 5μm, demonstrating that this optical lens is able to excellently correct chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0220] Example 6

[0221] See also Figure 26 , shown is a schematic structural diagram of an optical lens provided in Example 6 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0222] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave;

[0223] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0224] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0225] Aperture ST;

[0226] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0227] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0228] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both concave;

[0229] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0230] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0231] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0232] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0233] The imaging surface S18 is a plane.

[0234] The relevant parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0235] Table 6-1

[0236]

[0237] The surface parameters of the aspheric lens of the optical lens in Example 6 are shown in Table 6-2.

[0238] Table 6-2

[0239]

[0240] In this embodiment, the field curvature curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in FIG. Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 shown.

[0241] Figure 27 The field curvature curves for Example 6 are shown, showing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.02mm to 0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0242] Figure 28 The MTF (Modulation Transfer Function) curve for Example 6 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.4 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the periphery of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0243] Figure 29The following graph shows the axial aberration curve for Example 6, which plots the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within a range of -10 μm to 20 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0244] Figure 30 The vertical chromatic aberration curve for Example 6 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -1 μm to 5 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0245] Example 7

[0246] See also Figure 31 , shown is a schematic structural diagram of an optical lens provided in Example 7 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0247] The first lens L1 has negative refractive power, its object-side surface S1 is flat, and its image-side surface S2 is concave;

[0248] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0249] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0250] Aperture ST;

[0251] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0252] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0253] The sixth lens L6 has negative refractive power, its object-side surface S10 is concave, and its image-side surface S11 is convex;

[0254] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0255] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0256] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0257] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0258] The imaging surface S18 is a plane.

[0259] The relevant parameters of each lens in the optical lens in Example 7 are shown in Table 7-1.

[0260] Table 7-1

[0261]

[0262] The surface parameters of the aspheric lens of the optical lens in Example 7 are shown in Table 7-2.

[0263] Table 7-2

[0264]

[0265] In this embodiment, the field curvature curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in FIG. Figure 32 、 Figure 33 、 Figure 34 、 Figure 35 shown.

[0266] Figure 32 The field curvature curves for Example 7 are shown, showing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0267] Figure 33 The MTF (Modulation Transfer Function) curve for Example 7 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.4 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0268] Figure 34The following graph shows the axial aberration curve for Example 7, which plots the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the axial aberration offset is controlled within a range of -10 μm to 25 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0269] Figure 35 The vertical chromatic aberration curve for Example 7 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -1 μm to 4 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0270] Example 8

[0271] See also Figure 36 , shown is a schematic structural diagram of an optical lens provided in Example 8 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0272] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0273] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0274] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0275] Aperture ST;

[0276] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0277] The fifth lens L5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0278] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both concave;

[0279] The fifth lens L5 and the sixth lens L6 form a cemented lens group. That is, the cemented surface between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 is S10.

[0280] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0281] The object-side surface S14 and the image-side surface S15 of the filter G1 are both flat surfaces;

[0282] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0283] The imaging surface S18 is a plane.

[0284] The relevant parameters of each lens in the optical lens in Example 8 are shown in Table 8-1.

[0285] Table 8-1

[0286]

[0287] The surface parameters of the aspheric lens of the optical lens in Example 8 are shown in Table 8-2.

[0288] Table 8-2

[0289]

[0290] In this embodiment, the field curvature curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in FIG. Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 shown.

[0291] Figure 37 The field curvature curves for Example 8 are shown, representing 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 angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within a range of -0.02mm to 0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0292] Figure 38 The MTF (Modulation Transfer Function) curve for Example 8 is shown, representing the degree of lens imaging modulation at different spatial frequencies across the field of view. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this example is consistently above 0.4 across the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the periphery of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0293] Figure 39The following graph shows the axial aberration curve for Example 8, which plots the aberration along the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within a range of -10 μm to 20 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0294] Figure 40 The vertical chromatic aberration curve for Example 8 is shown. It plots the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -2 μm to 6 μm, demonstrating that this optical lens is capable of excellently correcting chromatic aberration in the peripheral field of view and the secondary spectrum across the entire image plane.

[0295] Please refer to Table 9, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value FNO, true image height IH and maximum field of view FOV of the optical lens, as well as the numerical values ​​corresponding to each conditional expression in each embodiment.

[0296] Table 9

[0297]

[0298] In summary, the optical lens provided by the present invention has an infrared confocal function, which meets the clarity requirements of imaging during the day and at night. By rationally configuring the surface shapes of each lens and rationally matching the optical power, the resolution of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved.

[0299] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0300] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface: a first lens having negative optical power and a concave image-side surface; a second lens having negative optical power, whose object-side surface is concave and whose image-side surface is convex; a third lens element having positive optical power and a convex object-side surface; Aperture; The fourth lens element has positive refractive power, and both the object-side surface and the image-side surface are convex; The fifth lens has positive refractive power, and both the object-side surface and the image-side surface are convex; a sixth lens element having negative optical power and a concave object-side surface; The seventh lens element has a negative optical power, its object-side surface is concave and its image-side surface is convex; The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.4 <IH / f<1.6。 2. The optical lens according to claim 1, wherein: The total optical length TTL and effective focal length f of the optical lens meet the following requirements: 5.0 <TTL / f<8.0。 3. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle meet the following requirements: 3.5 <TTL / IH<5.0。 4. The optical lens according to claim 1, wherein: The maximum field of view of the optical lens corresponds to the true image height IH and the entrance pupil diameter EPD satisfying: 2.5 <IH / EPD<3.0。 5. The optical lens according to claim 1, wherein: The maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the clear aperture D1 of the object side of the first lens satisfy the following relationship: 1.2<D1 / IH / tan(FOV / 2)<1.

9.

6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.5 <f1 / f<-1.5。 7. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 4.5 <f3 / f<7.0。 8. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 <f4 / f<2.0。 9. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.1 <f5 / f<1.7。 10. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.3 <f6 / f<-1.0。

Images