Optical lens

Abstract

The present invention provides an optical lens comprising six lenses, which, along the optical axis, from the object side to the imaging surface, comprise: a first lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens having negative optical power; a third lens having negative optical power, whose object side surface is concave; a fourth lens having positive optical power, whose object side surface is convex; an aperture; a fifth lens having negative optical power, whose image side surface is concave; and a sixth lens having positive optical power, whose object side and image side surfaces are both convex. The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy the following condition: f4 / f>3.0. The optical lens provided by the present invention improves the imaging quality of the optical lens, reduces aberrations, and enhances the imaging quality of the optical lens through the rational configuration of the surface shapes of the various lenses and the rational matching of the 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. Surround-view cameras are used to capture the vehicle's surroundings. Images captured by multiple cameras are ultimately transmitted to an onboard processor for real-time processing. The processor then performs appropriate corrections, stitching, and fusion to produce a continuous, seamless, and comprehensive 360-degree surround view image. Surround-view cameras typically use wide-angle lenses, which suffer from significant aberrations, significant field curvature, and poor image quality, making them difficult to meet user needs. Therefore, it is necessary to develop an optical lens with excellent imaging performance. 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 six lenses, which include the following lenses in order from the object side to the imaging surface along the optical axis:

[0006] a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave;

[0007] a second lens having negative optical power;

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

[0009] a fourth lens element having positive optical power and a convex object-side surface;

[0010] Aperture;

[0011] a fifth lens element having negative optical power and a concave image-side surface;

[0012] a sixth lens element having positive refractive power, wherein both the object-side surface and the image-side surface are convex;

[0013] The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: f4 / f>3.0.

[0014] Further preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL / f>16.0.

[0015] Further preferably, the effective focal length f of the optical lens, the arc θ of the maximum half field angle, and the real image height ih corresponding to the maximum half field angle satisfy: 1.1 <ih / (f×θ)<1.3。

[0016] Further preferably, the total optical length TTL of the optical lens, the arc θ of the maximum half field angle and the real image height ih corresponding to the maximum half field angle satisfy: 4.8 <TTL / ih / θ<5.7。

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6.5 <f1 / f<-5.0。

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f<-4.5.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -70.0 <f3 / f<-3.0。

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -8.5 <f5 / f<-1.0。

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.2 <f6 / f<2.3。

[0022] Further preferably, the combined focal length f13 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: -2.5 <f13 / f<-1.0。

[0023] Further preferably, the combined focal length f13 of the first lens, the second lens and the third lens and the focal length f4 of the fourth lens satisfy: -0.8 <f13 / f4<-0.2。

[0024] Further preferably, the object side curvature radius R11 of the sixth lens and the image side curvature radius R12 of the sixth lens satisfy: -0.6 <R11 / R12<-0.2。

[0025] The optical lens provided by the present invention improves the imaging quality 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

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0027] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0028] Figure 2 Graph showing the field curvature of the optical lens in Example 1 of the present invention.

[0029] Figure 3 : is the F-Theta distortion curve of the optical lens in Example 1 of the present invention.

[0030] Figure 4 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.

[0031] Figure 5 This is the MTF curve of the optical lens in Example 1 of the present invention.

[0032] Figure 6 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

[0033] Figure 7 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0034] Figure 8 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0035] Figure 9 Graph showing the field curvature of the optical lens in Example 2 of the present invention.

[0036] Figure 10 : is the F-Theta distortion curve of the optical lens in Example 2 of the present invention.

[0037] Figure 11 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.

[0038] Figure 12 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0039] Figure 13 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0040] Figure 14 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0041] Figure 15 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0042] Figure 16 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0043] Figure 17: This is the F-Theta distortion curve of the optical lens in Example 3 of the present invention.

[0044] Figure 18 This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.

[0045] Figure 19 This is the MTF curve of the optical lens in Example 3 of the present invention.

[0046] Figure 20 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0047] Figure 21 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0048] Figure 22 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0049] Figure 23 4 is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0050] Figure 24 : is the F-Theta distortion curve of the optical lens in Example 4 of the present invention.

[0051] Figure 25 This is a relative illumination curve diagram of the optical lens in Example 4 of the present invention.

[0052] Figure 26 This is the MTF curve of the optical lens in Example 4 of the present invention.

[0053] Figure 27 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0054] Figure 28 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0055] Figure 29 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0056] Figure 30 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0057] Figure 31 : is the F-Theta distortion curve of the optical lens in Example 5 of the present invention.

[0058] Figure 32 This is a relative illumination curve diagram of the optical lens in Example 5 of the present invention.

[0059] Figure 33 This is the MTF curve of the optical lens in Example 5 of the present invention.

[0060] Figure 34 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0061] Figure 35 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0062] Figure 36 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0063] Figure 37 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention.

[0064] Figure 38 : This is the F-Theta distortion curve of the optical lens in Example 6 of the present invention.

[0065] Figure 39 This is a relative illumination curve diagram of the optical lens in Example 6 of the present invention.

[0066] Figure 40 This is the MTF curve of the optical lens in Example 6 of the present invention.

[0067] Figure 41 Graph showing the axial aberration of the optical lens in Example 6 of the present invention.

[0068] Figure 42 Graph showing vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0069] Figure 43 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0070] Figure 44 4 is a field curvature curve diagram of the optical lens in Example 7 of the present invention.

[0071] Figure 45 : This is the F-Theta distortion curve of the optical lens in Example 7 of the present invention.

[0072] Figure 46 This is a relative illumination curve diagram of the optical lens in Example 7 of the present invention.

[0073] Figure 47 This is the MTF curve of the optical lens in Example 7 of the present invention.

[0074] Figure 48 Graph showing the axial aberration of the optical lens in Example 7 of the present invention.

[0075] Figure 49 Graph showing vertical axis chromatic aberration of the optical lens in Example 7 of the present invention.

[0076] Figure 50 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0077] Figure 51 4 is a field curvature curve diagram of the optical lens in Example 8 of the present invention.

[0078] Figure 52 : This is the F-Theta distortion curve of the optical lens in Example 8 of the present invention.

[0079] Figure 53 This is a relative illumination curve diagram of the optical lens in Example 8 of the present invention.

[0080] Figure 54 This is the MTF curve of the optical lens in Example 8 of the present invention.

[0081] Figure 55 4 is an axial aberration curve diagram of the optical lens in Example 8 of the present invention.

[0082] Figure 56 Graph showing vertical axis chromatic aberration of the optical lens in Example 8 of the present invention.

[0083] Figure 57 Schematic diagram of the structure of the optical lens in Example 9 of the present invention.

[0084] Figure 58 Graph showing the field curvature of the optical lens in Example 9 of the present invention.

[0085] Figure 59 : is the F-Theta distortion curve of the optical lens in Example 9 of the present invention.

[0086] Figure 60 This is a relative illumination curve diagram of the optical lens in Example 9 of the present invention.

[0087] Figure 61 This is an MTF curve diagram of the optical lens in Example 9 of the present invention.

[0088] Figure 62 Graph showing the axial aberration of the optical lens in Example 9 of the present invention.

[0089] Figure 63 Graph showing vertical axis chromatic aberration of the optical lens in Example 9 of the present invention.

[0090] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0096] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0097] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0098] The optical lens according to the embodiment of the present invention sequentially includes, along the optical axis from the object side to the imaging surface: a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a filter, and a protective glass. The aperture is disposed between the fourth lens and the fifth lens. The rear position of the aperture can filter out the light beams with poor imaging quality and retain the light beams with better imaging quality, effectively improving the imaging quality of off-axis points.

[0099] In some embodiments, the first lens may have a negative optical power, its object side is convex, and its image side is concave. The second lens may have a negative optical power. The third lens may have a negative optical power, its object side is concave. The fourth lens may have a positive optical power, its object side is convex. The fifth lens may have a negative optical power, its image side is concave. The sixth lens may have a positive optical power, both its object side and image side are convex.

[0100] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: f4 / f > 3.0. Satisfying the above range can make the fourth lens have a positive optical power, balance the negative optical power at the front end of the optical lens, and enable the light rays with a large field angle to enter the rear end of the optical lens smoothly.

[0101] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f satisfy: TTL / f > 16.0. Satisfying the above range ensures that the optical lens has sufficient overall length for design to meet the requirements of high resolution.

[0102] In some embodiments, the effective focal length f of the optical lens, the radian θ of the maximum semi-field angle, and the true image height ih corresponding to the maximum semi-field angle satisfy: 1.1 < ih / (f×θ) < 1.3. Satisfying the above range, the optical lens can simultaneously meet the requirements of a large image plane and a large field angle.

[0103] In some embodiments, the overall optical length TTL of the optical lens, the radian θ of the maximum semi-field angle, and the true image height ih corresponding to the maximum semi-field angle satisfy: 4.8 < TTL / ih / θ < 5.7. Satisfying the above range can balance the relationship among the image height, the overall optical length, and the field angle of the optical lens.

[0104] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6.5 < f1 / f < -5.0. Satisfying the above range can make the first lens have an appropriate negative optical power, which is beneficial to forming a short focal length lens structure to enable light rays with a large viewing angle to enter the optical lens.

[0105] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f < -4.5. Meeting the above range can make the second lens have a negative optical power, which can share the negative optical power at the front end of the optical lens, enabling light rays with a large field angle to smoothly enter the optical lens to expand the light collection range.

[0106] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -70.0 < f3 / f < -3.0. Meeting the above range can make the third lens have an appropriate negative optical power, which can share the negative optical power at the front end of the optical lens, enabling light rays with a large field angle to smoothly enter the optical lens to expand the light collection range.

[0107] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -8.5 < f5 / f < -1.0. Meeting the above range can make the fifth lens have an appropriate negative optical power, which is beneficial to correcting various aberrations and improving the imaging quality of the optical lens.

[0108] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.2 < f6 / f < 2.3. Meeting the above range can make the sixth lens have an appropriate positive optical power, which is beneficial to correcting various aberrations and improving the imaging quality of the optical lens.

[0109] In some embodiments, the combined focal length f13 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: -2.5 < f13 / f < -1.0. Meeting the above range is beneficial for the beam width entering the optical lens to be larger, and then it can be fully transmitted to the high-pixel imaging surface, enabling the optical lens to obtain a wider field of view range. At the same time, it is also beneficial for the optical lens to achieve high-pixel and large-image-plane imaging.

[0110] In some embodiments, the combined focal length f13 of the first lens, the second lens and the third lens and the focal length f4 of the fourth lens satisfy: -0.8 < f13 / f4 < -0.2. Meeting the above range ensures that the off-axis aberration correction generated by the front-end lens of the optical lens by the fourth lens will not be too large, which will lead to a decrease in the image height of the optical lens; at the same time, it can provide good aberration correction ability and improve the imaging quality of the optical lens.

[0111] In some embodiments, the object-side curvature radius R11 of the sixth lens and the image-side curvature radius R12 of the sixth lens satisfy: -0.6 < R11 / R12 < -0.2. Meeting the above range can reduce the angle at which the chief ray of the marginal field of view enters the imaging surface of the optical lens, thereby improving the imaging quality of the optical lens.

[0112] In some embodiments, the third lens and the fourth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the decentration sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the optical lens processing technology and improving the assembly yield of the optical lens.

[0113] In some embodiments, the fifth lens and the sixth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the decentration sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the optical lens processing technology and improving the assembly yield of the optical lens.

[0114] In order to make the system have better optical performance, multiple aspheric lenses are used in the lens. The shape of each aspheric surface of the optical lens satisfies the following equation:

[0115]

[0116] Where z is the distance between the surface and the vertex 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, and 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.

[0117] 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.

[0118] Example 1

[0119] 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, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0120] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0121] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0122] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0123] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex;

[0124] Aperture ST;

[0125] The fifth lens L5 has negative refractive power, its object-side surface S9 is convex, and its image-side surface S10 is concave;

[0126] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex;

[0127] 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.

[0128] The object side surface S12 and the image side surface S13 of the filter G1 are both flat surfaces;

[0129] The object side surface S14 and the image side surface S15 of the protective glass G2 are both flat surfaces;

[0130] The imaging surface S16 is a plane.

[0131] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0132] Table 1-1

[0133]

[0134]

[0135] The surface parameters of the aspheric lens of the optical lens in Example 1 are shown in Table 1-2.

[0136] Table 1-2

[0137] Face number K A B C D E F S3 -2.06E-01 0.00E+00 -1.07E-02 5.11E-03 -7.43E-04 4.75E-05 -1.40E-06 S4 2.18E-03 0.00E+00 -3.48E-02 1.96E-02 -1.16E-02 4.82E-03 -7.85E-04 S7 5.63E-02 0.00E+00 -2.54E-03 3.57E-03 -1.77E-03 5.09E-04 -7.15E-05 S8 -1.39E+01 0.00E+00 5.75E-02 -1.11E-01 2.00E-01 -1.58E-01 4.23E-02 S9 3.99E+01 0.00E+00 4.66E-02 -8.36E-02 1.67E-02 5.24E-02 -3.74E-02 S10 -7.44E-01 0.00E+00 4.87E-02 -3.85E-01 2.63E-01 -7.77E-02 -6.46E-04 S11 -4.61E+00 0.00E+00 -6.04E-02 2.10E-02 -2.16E-03 -7.63E-04 2.23E-04

[0138] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 shown.

[0139] Figure 2The 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 a range of -0.08mm to 0.06mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0140] Figure 3 The F-Theta distortion curve for Example 1 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-20%, and the image compression in the edge angle area is relatively smooth, effectively improving the clarity of the expanded image.

[0141] Figure 4 The relative illumination curve of Example 1 is shown, which represents the relative illumination values ​​at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0142] Figure 5 The MTF (Modulation Transfer Function) curve for Example 1 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 embodiment 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 6 The 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 -20μm to 10μm, indicating that the optical lens can effectively correct axial aberration.

[0144] Figure 7The 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 -4 μm to 3 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 2

[0146] See also Figure 8 , shown is a schematic structural diagram of the optical lens provided in Example 2 of the present invention. Compared with Example 1, this embodiment differs in that the object-side surface S3 of the second lens L2 is concave, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0147] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

[0148] Table 2-1

[0149]

[0150]

[0151] The surface parameters of the aspheric lens of the optical lens in Example 2 are shown in Table 2-2.

[0152] Table 2-2

[0153] Face number K A B C D E F S3 -1.53E+01 0.00E+00 3.84E-02 -5.99E-03 4.48E-04 -3.27E-06 -5.09E-07 S4 7.64E-01 0.00E+00 2.88E-02 5.32E-03 -4.69E-03 7.66E-04 -1.12E-05 S7 1.12E+00 0.00E+00 -9.11E-04 1.05E-03 -5.54E-04 1.88E-04 -2.83E-05 S8 -4.48E+00 0.00E+00 5.17E-02 -1.12E-01 2.17E-01 -1.99E-01 6.81E-02 S9 1.88E+01 0.00E+00 1.57E-02 -3.87E-02 3.10E-02 -1.13E-02 9.54E-04 S10 -8.63E-01 0.00E+00 -5.38E-02 -1.34E-01 1.04E-01 -3.61E-02 4.10E-03 S11 -4.50E+00 0.00E+00 -4.41E-02 2.02E-02 -8.95E-03 2.89E-03 -4.69E-04

[0154] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 shown.

[0155] Figure 9 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 a range of -0.12mm to 0.03mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0156] Figure 10The F-Theta distortion curve for Example 2 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-20%, and the image compression at the edge angle area is relatively smooth, effectively improving the clarity of the expanded image.

[0157] Figure 11 The relative illumination curve of Example 2 is shown, which represents the relative illumination values ​​at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0158] Figure 12 The MTF (Modulation Transfer Function) curve for Example 2 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 embodiment 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.

[0159] Figure 13 The following graph shows the axial aberration curve for Example 2, 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 -20μm to 12μm, indicating that the optical lens can effectively correct axial aberration.

[0160] Figure 14 The vertical chromatic aberration curve for Example 2 shows 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 the longest and shortest wavelengths is controlled within ±2 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.

[0161] Example 3

[0162] See also Figure 15, shown is a schematic structural diagram of the optical lens provided in Example 3 of the present invention. Compared with Example 1, this embodiment differs in that the object-side surface S9 of the fifth lens L5 is concave, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0163] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0164] Table 3-1

[0165]

[0166]

[0167] The surface parameters of the aspheric lens of the optical lens in Example 3 are shown in Table 3-2.

[0168] Table 3-2

[0169] Face number K A B C D E F S3 -6.22E-01 0.00E+00 -4.76E-03 -1.68E-03 7.94E-04 -1.00E-04 4.82E-06 S4 -4.26E-01 0.00E+00 -3.26E-02 -3.69E-03 -3.22E-03 1.94E-03 -3.35E-04 S5 -6.40E+01 0.00E+00 -2.22E-02 -5.26E-04 1.14E-03 -3.52E-04 3.88E-05 S6 -3.08E+01 0.00E+00 -3.23E-02 1.58E-03 1.52E-03 -2.73E-04 1.42E-06 S7 -2.84E+00 0.00E+00 4.45E-02 6.30E-03 4.65E-03 -7.21E-03 3.45E-03 S8 -1.05E+02 0.00E+00 1.44E-01 6.00E-02 4.03E-02 -1.38E-01 1.19E-01 S9 5.28E+01 0.00E+00 1.88E-01 -1.27E-01 3.48E-04 1.90E-01 -1.44E-01 S10 -8.91E-01 0.00E+00 -1.23E-03 -2.14E-01 1.63E-01 -4.08E-02 -2.17E-04 S11 -9.94E+00 0.00E+00 -1.54E-01 1.51E-01 -1.15E-01 5.30E-02 -1.07E-02

[0170] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 shown.

[0171] Figure 16 The field curvature curves for Example 3 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 -0.08mm to 0, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0172] Figure 17 The F-Theta distortion curve for Example 3 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-20%, and the image compression at the edge angle area is relatively smooth, effectively improving the clarity of the expanded image.

[0173] Figure 18The relative illumination curve of Example 3 is shown, which represents the relative illumination values ​​at different field angles on the imaging surface. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0174] Figure 19 The MTF (Modulation Transfer Function) curve for Example 3 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 embodiment 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.

[0175] Figure 20 The following graph shows the axial aberration curve for Example 3, 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 -20 μm to 10 μm, indicating that the optical lens is able to effectively correct axial aberration.

[0176] Figure 21 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 ±1 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.

[0177] Example 4

[0178] See also Figure 22 , shown is a schematic structural diagram of the optical lens provided in Example 4 of the present invention. Compared with Example 1, this embodiment differs in that the image-side surface S6 of the third lens L3 is concave, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0179] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0180] Table 4-1

[0181]

[0182]

[0183] The surface parameters of the aspheric lens of the optical lens in Example 4 are shown in Table 4-2.

[0184] Table 4-2

[0185] Face number K A B C D E F S3 3.64E+01 0.00E+00 -1.05E-02 4.82E-03 -7.20E-04 4.60E-05 -1.39E-06 S4 -9.32E-02 0.00E+00 -2.95E-02 1.93E-02 -1.10E-02 4.50E-03 -7.13E-04 S7 3.17E-02 0.00E+00 -5.13E-04 3.39E-03 -1.68E-03 6.00E-04 -1.03E-04 S8 -6.11E+00 0.00E+00 6.78E-02 -1.04E-01 1.89E-01 -1.37E-01 2.76E-02 S9 3.19E+01 0.00E+00 3.70E-02 -6.75E-02 1.72E-02 3.56E-02 -2.46E-02 S10 -7.39E-01 0.00E+00 3.73E-02 -3.56E-01 2.48E-01 -6.92E-02 -7.97E-04 S11 -4.16E+00 0.00E+00 -5.62E-02 1.84E-02 -2.56E-03 1.24E-04 -2.92E-05

[0186] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 23 、 Figure 24 、 Figure 25 、 Figure 26 、 Figure 27 、 Figure 28 shown.

[0187] Figure 23 The field curvature curves for Example 4 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 a range of -0.09mm to 0.06mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0188] Figure 24 The F-Theta distortion curve for Example 4 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-20%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0189] Figure 25 The relative illumination curve of Example 4 is shown, which represents the relative illumination values ​​at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0190] Figure 26The MTF (Modulation Transfer Function) curve for Example 4 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 edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0191] Figure 27 The following graph shows the axial aberration curve for Example 4, 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 -20μm to 10μm, indicating that the optical lens can effectively correct axial aberration.

[0192] Figure 28 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 -4 μm to 3 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.

[0193] Example 5

[0194] See also Figure 29 , shown is a schematic structural diagram of the optical lens provided in Example 5 of the present invention. Compared with Example 1, this embodiment is different in that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0195] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0196] Table 5-1

[0197]

[0198]

[0199] The surface parameters of the aspheric lens of the optical lens in Example 5 are shown in Table 5-2.

[0200] Table 5-2

[0201] Face number K A B C D E F S3 2.47E+01 0.00E+00 -5.36E-03 2.30E-03 -1.86E-04 5.69E-06 -1.08E-06 S4 -2.17E-01 0.00E+00 9.23E-04 -6.49E-03 2.45E-03 2.15E-04 -8.10E-05 S5 -1.56E+01 0.00E+00 3.93E-03 6.76E-04 7.80E-04 2.89E-05 7.13E-06 S6 1.38E+02 0.00E+00 1.04E-01 -1.79E-02 -4.81E-03 7.41E-03 -1.27E-03 S9 3.60E+00 0.00E+00 -6.56E-02 4.73E-02 -7.31E-02 6.13E-02 -2.01E-02 S10 -1.20E+00 0.00E+00 -5.95E-02 -5.09E-04 5.46E-03 5.32E-03 -3.76E-03 S11 -9.27E+00 0.00E+00 -7.86E-02 2.90E-02 -1.87E-03 -2.16E-03 5.20E-04

[0202] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 30 、 Figure 31 、 Figure 32 、 Figure 33 、 Figure 34 、 Figure 35 shown.

[0203] Figure 30 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 a range of -0.05mm to 0.16mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0204] Figure 31 The F-Theta distortion curve for Example 5 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-15%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0205] Figure 32 The relative illumination curve of Example 5 is shown, which shows the relative illumination values ​​at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0206] Figure 33 The MTF (Modulation Transfer Function) curve for Example 5 is shown, showing 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 0.2 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.

[0207] Figure 34The 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 -30 μm to 10 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0208] Figure 35 The vertical chromatic aberration curve for Example 5 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 -3 μm to 1 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.

[0209] Example 6

[0210] See also Figure 36 , shown is a schematic structural diagram of an optical lens provided in Example 6 of the present invention. Compared with Example 1, this embodiment differs in that the object-side surface S3 of the second lens L2 is concave, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0211] The relevant parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0212] Table 6-1

[0213]

[0214] The surface parameters of the aspheric lens of the optical lens in Example 6 are shown in Table 6-2.

[0215] Table 6-2

[0216] Face number K A B C D E F S3 -2.00E+02 0.00E+00 -2.09E-03 2.25E-03 -1.78E-04 6.62E-06 -1.05E-06 S4 -4.98E-01 0.00E+00 -6.66E-03 -4.42E-03 2.29E-03 2.23E-04 -7.45E-05 S5 -1.93E+01 0.00E+00 3.79E-03 4.49E-04 6.24E-04 1.31E-05 -3.98E-07 S6 1.03E+02 0.00E+00 1.09E-01 -2.04E-02 -5.83E-03 6.74E-03 -1.18E-03 S9 5.52E+00 0.00E+00 -6.59E-02 4.80E-02 -7.95E-02 7.42E-02 -2.89E-02 S10 -1.17E+00 0.00E+00 -7.43E-02 1.40E-02 2.03E-02 -1.30E-02 1.39E-03 S11 -8.85E+00 0.00E+00 -1.07E-01 5.72E-02 -1.72E-02 1.62E-03 1.52E-04

[0217] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 、 Figure 41 、 Figure 42 shown.

[0218] Figure 37The 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 0.04mm to 0.12mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0219] Figure 38 The F-Theta distortion curve for Example 6 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-20%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0220] Figure 39 The relative illumination curve of Example 6 is shown, which represents the relative illumination values ​​at different field angles on the imaging surface. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0221] Figure 40 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 (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.2 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.

[0222] Figure 41 The following graph shows the axial aberration curve for Example 6, 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 -25μm to 5μm, indicating that the optical lens can effectively correct axial aberration.

[0223] Figure 42The 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 ±2 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.

[0224] Example 7

[0225] See also Figure 43 , shown is a schematic structural diagram of an optical lens provided in Example 7 of the present invention. Compared with Example 1, this embodiment differs in that the object-side surface S3 of the second lens L2 is concave, the image-side surface S6 of the third lens L3 is concave, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0226] The relevant parameters of each lens in the optical lens in Example 7 are shown in Table 7-1.

[0227] Table 7-1

[0228]

[0229] The surface parameters of the aspheric lens of the optical lens in Example 7 are shown in Table 7-2.

[0230] Table 7-2

[0231]

[0232]

[0233] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 44 、 Figure 45 、 Figure 46 、 Figure 47 、 Figure 48 、 Figure 49 shown.

[0234] Figure 44 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 a range of -0.04mm to 0.06mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0235] Figure 45The F-Theta distortion curve for Example 7 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-20%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0236] Figure 46 The relative illumination curve of Example 7 is shown, which represents the relative illumination values ​​at different field angles on the imaging surface. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0237] Figure 47 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 embodiment is consistently above 0.3 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.

[0238] Figure 48 The 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 offset of the axial aberration is controlled within a range of -20 μm to 5 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0239] Figure 49 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 ±2 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.

[0240] Example 8

[0241] See also Figure 50, shown is a schematic structural diagram of an optical lens provided in Example 8 of the present invention. Compared with Example 1, this embodiment differs in that: the object-side surface S3 of the second lens L2 is concave, the image-side surface S4 of the second lens L2 is convex, the image-side surface S6 of the third lens L3 is concave, and the image-side surface S8 of the fourth lens L4 is concave. The optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0242] The relevant parameters of each lens in the optical lens in Example 8 are shown in Table 8-1.

[0243] Table 8-1

[0244]

[0245] The surface parameters of the aspheric lens of the optical lens in Example 8 are shown in Table 8-2.

[0246] Table 8-2

[0247]

[0248]

[0249] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 51 、 Figure 52 、 Figure 53 、 Figure 54 、 Figure 55 、 Figure 56 shown.

[0250] Figure 51 The field curvature curves for Example 8 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 a range of -0.08mm to 0.04mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0251] Figure 52 The F-Theta distortion curve for Example 8 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-30%, and the image compression at the edge angles is relatively smooth, effectively improving the clarity of the expanded image.

[0252] Figure 53The relative illumination curve of Example 8 is shown, which represents the relative illumination values ​​at different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0253] Figure 54 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 (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 0.3 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.

[0254] Figure 55 The 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 -15 μm to 10 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0255] Figure 56 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 ±2 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.

[0256] Example 9

[0257] See also Figure 57 , shown is a schematic structural diagram of an optical lens provided in Example 9 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, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a filter G1, and a protective glass G2.

[0258] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0259] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both concave;

[0260] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both concave;

[0261] The fourth lens L4 has positive refractive power, its object-side surface S6 is convex, and its image-side surface S7 is concave;

[0262] The third lens L3 and the fourth lens L4 form a cemented lens group, that is, the cemented surface between the image-side surface of the third lens L3 and the object-side surface of the fourth lens L4 is S6;

[0263] Aperture ST;

[0264] The fifth lens L5 has negative refractive power, its object-side surface S8 is convex, and its image-side surface S9 is concave;

[0265] The sixth lens L6 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex;

[0266] 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 S9.

[0267] The object-side surface S11 and the image-side surface S12 of the filter G1 are both flat surfaces;

[0268] The object side surface S13 and the image side surface S14 of the protective glass G2 are both flat surfaces;

[0269] The imaging surface S15 is a plane.

[0270] The relevant parameters of each lens in the optical lens in Example 9 are shown in Table 9-1.

[0271] Table 9-1

[0272]

[0273]

[0274] The surface parameters of the aspheric lens of the optical lens in Example 9 are shown in Table 9-2.

[0275] Table 9-2

[0276] Face number K A B C D E F S3 -1.92E+02 0.00E+00 8.74E-03 -2.68E-03 6.75E-04 -7.01E-05 2.94E-06 S4 9.02E-01 0.00E+00 -3.08E-02 -1.09E-02 5.38E-03 -8.60E-04 3.08E-05 S5 -3.87E+00 0.00E+00 -9.24E-02 4.73E-02 -1.43E-02 2.54E-03 -2.02E-04 S6 -1.42E-01 0.00E+00 2.07E-01 -2.37E-01 1.04E-01 -2.22E-02 1.65E-03 S7 0.00E+00 0.00E+00 -4.48E-01 8.32E-01 -1.02E+00 7.16E-01 -2.26E-01 S8 -8.92E+00 0.00E+00 -1.83E-01 4.64E-01 -6.39E-01 4.68E-01 -1.39E-01 S9 -8.95E-01 0.00E+00 -1.73E-01 6.30E-02 -2.98E-02 2.38E-02 -6.40E-03 S10 -4.06E+00 0.00E+00 -4.93E-02 2.87E-02 -1.21E-02 3.08E-03 -4.22E-04

[0277] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 58 、 Figure 59 、 Figure 60 、 Figure 61 、 Figure 62 、 Figure 63 shown.

[0278] Figure 58 The field curvature curves for Example 9 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 a range of -0.12mm to 0, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0279] Figure 59 The F-Theta distortion curve for Example 9 is shown. It represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0-35%, and the image compression in the edge angle area is relatively smooth, effectively improving the clarity of the expanded image.

[0280] Figure 60 The relative illumination curve of Example 9 is shown, which represents the relative illumination values ​​at different field angles on the imaging surface. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0281] Figure 61 The MTF (Modulation Transfer Function) curve for Example 9 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 0.3 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.

[0282] Figure 62 The following graph shows the axial aberration curve for Example 9, 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 -20 μm to 25 μm, demonstrating that the optical lens is capable of effectively correcting axial aberration.

[0283] Figure 63The vertical chromatic aberration curve for Example 9 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 2 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.

[0284] Please refer to Table 10, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value FNO, real image height ih corresponding to the maximum half field of view angle, chief ray incidence angle CRA, and maximum field of view angle FOV of the optical lens, as well as the numerical values ​​corresponding to each conditional expression in each embodiment.

[0285] Table 10

[0286]

[0287]

[0288] In summary of the above embodiments, the optical lens provided by the present invention improves the imaging quality 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 power.

[0289] 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.

[0290] 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 six lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave; a second lens having negative optical power; a third lens element having negative optical power and a concave object-side surface; a fourth lens element having positive optical power and a convex object-side surface; Aperture; a fifth lens element having negative optical power and a concave image-side surface; a sixth lens element having positive refractive power, wherein both the object-side surface and the image-side surface are convex; The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy the following conditions: 5.38≥f4 / f>3.0; The total optical length TTL and the effective focal length f of the optical lens satisfy the following conditions: 20.93 ≥ TTL / f > 16.0; The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6.5 <f1 / f<-5.0; The effective focal length f of the optical lens, the arc θ of the maximum half field of view angle, and the real image height ih corresponding to the maximum half field of view angle satisfy: 1.1 <ih / (f×θ)<1.3。 2. The optical lens according to claim 1, wherein: The total optical length TTL and the effective focal length f of the optical lens satisfy the following conditions: 20.93≥TTL / f≥17.

55.

3. 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: 5.38≥f4 / f≥3.

03.

4. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens, the arc of the maximum half field angle θ and the real image height ih corresponding to the maximum half field angle satisfy: 4.8 <TTL / ih / θ<5.7。 5. 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: -6.11≤f1 / f≤-5.

20.

6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2.00E+11≤f2 / f<-4.

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: -70.0 <f3 / f<-3.0。 8. The optical lens according to claim 1, wherein: The combined focal length f13 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: -2.5 <f13 / f<-1.0。 9. The optical lens according to claim 1, wherein: The combined focal length f13 of the first lens, the second lens and the third lens and the focal length f4 of the fourth lens satisfy: -0.8 <f13 / f4<-0.2。 10. The optical lens according to claim 1, wherein: The object side curvature radius R11 of the sixth lens and the image side curvature radius R12 of the sixth lens satisfy: -0.6 <R11 / R12<-0.2。

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