Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses arranged along an optical axis from an object side to an imaging surface in sequence, wherein the first lens has a negative focal length, and an image side of the first lens is concave; the second lens has a positive focal length, and an image side of the second lens is convex; a stop is arranged between the first lens and the second lens; the third lens has a positive focal length, and an object side of the third lens is convex, and an image side of the third lens is convex; the fourth lens has a negative focal length; the fifth lens has a positive focal length; the sixth lens has a negative focal length; and the seventh lens has a positive focal length; wherein a maximum field of view FOV of the optical lens and an aperture value FNO of the optical lens satisfy 65°<FOV / FNO<105°. Through reasonable collocation of lens shapes and focal length combinations between the lenses, the effect of large field of view, large aperture and miniaturization is achieved.

Description

TECHNICAL FIELD

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

[0002] With the development of automobile intelligence, the driving assistance function of vehicles is gradually enhanced, and the visual information collection is the core tool. With the improvement of the level of automatic driving, the requirements for vehicle-mounted cameras are also gradually improved, especially for front cameras. The front camera can enhance the active safety and driver assistance function, such as automatic emergency braking (AEB), adaptive cruise control (ACC), lane keeping assistance system (LKAS) and traffic jam assistance (TJA), etc. The front camera has the advantages of meeting high resolution, large field of view, good environmental adaptability, etc., but also has the disadvantages of too many lenses and too long total optical length, which is not conducive to the miniaturization of electronic systems. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens which can solve one or more of the above problems.

[0004] To achieve the above purpose, the present application provides an optical lens, which has seven lenses in total, and the lenses are arranged in order along the optical axis from the object side to the imaging surface as follows: a first lens with negative focal power, the image side of which is a concave surface; a second lens with positive focal power, the image side of which is a convex surface; a stop; a third lens with positive focal power, the object side of which is a convex surface and the image side of which is a convex surface; a fourth lens with negative focal power; a fifth lens with positive focal power; a sixth lens with negative focal power; and a seventh lens with positive focal power; wherein the maximum field of view FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 65°<FOV / FNO<105°.

[0005] In some embodiments, the object side of the first lens is a convex surface.

[0006] In some embodiments, the object side of the first lens is a concave surface.

[0007] In some embodiments, the object side of the second lens is a convex surface.

[0008] In some embodiments, the object side of the second lens is a concave surface.

[0009] In some embodiments, the object side of the fourth lens is a convex surface.

[0010] In some embodiments, the object side of the fourth lens is a concave surface.

[0011] In some embodiments, the image side of the fourth lens is a concave surface.

[0012] In some embodiments, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is convex.

[0013] In some embodiments, the object side surface of the sixth lens is concave.

[0014] In some embodiments, the image side surface of the sixth lens is concave.

[0015] In some embodiments, the image side surface of the sixth lens is convex.

[0016] In some embodiments, the object side surface of the seventh lens is convex.

[0017] In some embodiments, the image side surface of the seventh lens is convex.

[0018] In some embodiments, the image side surface of the seventh lens is concave.

[0019] In some embodiments, the third lens and the seventh lens have aspherical surfaces.

[0020] In some embodiments, the second lens and the seventh lens have aspherical surfaces.

[0021] In some embodiments, the fourth lens and the fifth lens are cemented to form a cemented lens.

[0022] In some embodiments, the fifth lens and the sixth lens are cemented to form a cemented lens.

[0023] In some embodiments, the maximum field angle of the optical lens corresponds to a real image height IH, and the entrance pupil diameter EPD of the optical lens satisfies: 2.5 < IH / EPD < 3.5.

[0024] In some embodiments, the maximum field angle FOV of the optical lens, the effective focal length f of the optical lens, and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 65° < FOVxf / IH < 75°.

[0025] In some embodiments, the effective aperture D1 of the object side surface of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum half field angle θ of the optical lens satisfy: 0.2 < D1 / IH / tan(θ) < 1.0.

[0026] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.0 < f2 / f3 < 2.7.

[0027] In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -5.0 < f4 / f5 < -0.8.

[0028] In some embodiments, the effective focal length f of the optical lens and the effective focal length f1 of the first lens satisfy: -2.0 < f1 / f < -1.2.

[0029] In some embodiments, the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy: 2.9 < f2 / f < 6.5.

[0030] In some embodiments, the effective focal length f of the optical lens and the effective focal length f3 of the third lens satisfy: 1.6 < f3 / f < 2.8.

[0031] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 3.0 < TTL / IH < 4.0.

[0032] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2 < TTL / f < 7.2.

[0033] Compared with the prior art, the optical lens provided by the present application has the advantages that: the optical power distribution, the stop position, the lens thickness and the lens interval are set reasonably, so that the optical lens has a compact large-aperture structure, and more light flux can enter the optical lens, so that the optical lens can also form a clear image in a dim environment, and the effects of large field of view, large aperture and miniaturization are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0035] Figure 2 FIG. 2 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.

[0036] Figure 3 FIG. 3 is a relative luminance curve diagram of the optical lens according to the embodiment of the present application.

[0037] Figure 4 FIG. 4 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0038] Figure 5 FIG. 5 is an axial aberration curve diagram of the optical lens according to the embodiment of the present application.

[0039] Figure 6 FIG. 6 is a transverse chromatic aberration curve diagram of the optical lens according to the embodiment of the present application.

[0040] Figure 7 Structure diagram of the optical lens of embodiment 2 of the present application.

[0041] Figure 8 Field curvature curve of the optical lens of embodiment 2 of the present application.

[0042] Figure 9 Relative luminance curve of the optical lens of embodiment 2 of the present application.

[0043] Figure 10 MTF curve of the optical lens of embodiment 2 of the present application.

[0044] Figure 11 Axial aberration curve of the optical lens of embodiment 2 of the present application.

[0045] Figure 12 Vignetting curve of the optical lens of embodiment 2 of the present application.

[0046] Figure 13 Structure diagram of the optical lens of embodiment 3 of the present application.

[0047] Figure 14 Field curvature curve of the optical lens of embodiment 3 of the present application.

[0048] Figure 15 Relative luminance curve of the optical lens of embodiment 3 of the present application.

[0049] Figure 16 MTF curve of the optical lens of embodiment 3 of the present application.

[0050] Figure 17 Axial aberration curve of the optical lens of embodiment 3 of the present application.

[0051] Figure 18 Vignetting curve of the optical lens of embodiment 3 of the present application.

[0052] Figure 19 Structure diagram of the optical lens of embodiment 4 of the present application.

[0053] Figure 20 Field curvature curve of the optical lens of embodiment 4 of the present application.

[0054] Figure 21 Relative luminance curve of the optical lens of embodiment 4 of the present application.

[0055] Figure 22 MTF curve of the optical lens of embodiment 4 of the present application.

[0056] Figure 23A graph of an axial chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0057] Figure 24 A graph of a lateral chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0058] Figure 25 A schematic structural view of the optical lens in Embodiment 5 of the present application.

[0059] Figure 26 A graph of a curvature of field curve of the optical lens in Embodiment 5 of the present application.

[0060] Figure 27 A graph of a relative illuminance curve of the optical lens in Embodiment 5 of the present application.

[0061] Figure 28 A graph of an MTF curve of the optical lens in Embodiment 5 of the present application.

[0062] Figure 29 A graph of an axial chromatic aberration curve of the optical lens in Embodiment 5 of the present application.

[0063] Figure 30 A graph of a lateral chromatic aberration curve of the optical lens in Embodiment 5 of the present application. DETAILED DESCRIPTION

[0064] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed description are merely descriptive of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals will refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0065] It is to be noted that, in the present specification, the expressions first, second, third and the like are used merely to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0066] In the drawings, the thickness, size, and shape of lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0067] In the present disclosure, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region; if a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens.

[0068] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Furthermore, the word "exemplary" is intended to mean an example or an illustration.

[0069] 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 the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0070] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0071] The optical lens according to the embodiments of the present application comprises, in order from the object side to the image side: a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and a filter and a protective glass.

[0072] The first lens has a negative focal power, the object side surface is convex or concave, and the image side surface is concave; the second lens has a positive focal power, the object side surface is convex or concave, and the image side surface is convex; the third lens has a positive focal power, the object side surface is convex, and the image side surface is convex; the fourth lens has a negative focal power, the object side surface is convex or concave, and the image side surface is concave; the fifth lens has a positive focal power, the object side surface is convex, and the image side surface is convex; the sixth lens has a negative focal power, the object side surface is concave, and the image side surface is convex or concave; and the seventh lens has a positive focal power, the object side surface is convex, and the image side surface is concave or convex.

[0073] In some embodiments, a diaphragm can be arranged between the second lens and the third lens to condense the range of light exiting the front end of the optical lens and reduce the aperture of the rear end of the optical lens.

[0074] In some embodiments, the fourth lens and the fifth lens can be cemented to form a cemented lens, or the fifth lens and the sixth lens can be cemented to form a cemented lens, to share the chromatic aberration correction of the optical lens, improve the resolution of the optical lens, and make the structure of the optical lens compact, which is conducive to the miniaturization of the optical lens.

[0075] In some embodiments, the FNO of the optical lens satisfies: 1.60≤FNO. Satisfying the above range is conducive to realizing the large aperture characteristic, and ensuring the clarity of the image in a weak light environment or at night.

[0076] In some embodiments, the maximum half field angle θ of the optical lens satisfies: 50°<θ<90°. Satisfying the above range is conducive to realizing the wide-angle characteristic, so as to be able to obtain more scene information and meet the demand for large-range detection.

[0077] In some embodiments, the incident angle CRA of the chief ray of the maximum field angle of the optical lens on the image plane satisfies: 10°<CRA<30°. Satisfying the above range can make the CRA of the optical lens have a larger allowable error range with the CRA of the photosensitive element of the chip, and improve the adaptation ability of the optical lens to the image sensor.

[0078] In some embodiments, the maximum field angle FOV of the optical lens and the FNO satisfy: 65°<FOV / FNO<105°. Satisfying the above range is conducive to expanding the field angle of the optical lens and increasing the aperture of the optical lens, realizing the characteristics of wide angle and large aperture. The realization of the wide-angle characteristic is conducive to obtaining more scene information and meeting the demand for large-range detection, and the realization of the large-aperture characteristic is conducive to improving the problem of rapid decline of the relative brightness of the edge field caused by the wide angle, so as to also be conducive to obtaining more scene information.

[0079] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD satisfy: 2.5<IH / EPD<3.5. Satisfying the above range is conducive to balancing the size of the image plane and the relative luminance of the edge field, and realizing the balance of large field of view, large aperture, and miniaturization.

[0080] In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV, and the real image height IH corresponding to the maximum field angle satisfy: 65°<FOVxf / IH<75°. Satisfying the above range can balance the demand for large-range detection and high-quality imaging, and improve the adaptability of the optical lens.

[0081] In some embodiments, the effective aperture D1 of the first lens object side, the real image height IH corresponding to the maximum field of view angle, and the maximum half field of view angle θ satisfy: 0.2 < D1 / IH / tan(θ) < 1.0. Satisfying the above range is conducive to reducing the front aperture of the optical lens, and realizing the miniaturization of the optical lens.

[0082] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.0 < f2 / f3 < 2.7. Satisfying the above range can control the focal lengths of the second lens and the third lens to be closer, which is conducive to the smooth transition of light and improves the imaging quality of the optical lens.

[0083] In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -5.0 < f4 / f5 < -0.8. Satisfying the above range can effectively improve the achromatic ability of the fourth lens and the fifth lens by reasonably setting the focal length ratio of the cemented lens composed of the fourth lens and the fifth lens, so that the light passing through the cemented lens enters the imaging surface more uniformly, thereby improving the imaging quality of the optical lens.

[0084] In some embodiments, the effective focal length f of the optical lens and the effective focal length f1 of the first lens satisfy: -2.0 < f1 / f < -1.2. Satisfying the above range can make the first lens have appropriate negative focal power, which is conducive to making the refraction angle of the incident light change more gently, avoiding excessive refraction changes that produce too many aberrations, and helping more light enter the rear lens to improve the relative illumination.

[0085] In some embodiments, the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy: 2.9 < f2 / f < 6.5. Satisfying the above range can make the second lens have appropriate positive focal power, which is conducive to the smooth transition of light and can correct the aberrations produced by the excessive deflection of light through the first lens, thereby improving the imaging quality of the optical lens.

[0086] In some embodiments, the effective focal length f of the optical lens and the effective focal length f3 of the third lens satisfy: 1.6 < f3 / f < 2.8. Satisfying the above range can make the third lens have appropriate positive focal power, so that the angle between the normal of the object side and the image side and the incident light is small, thereby suppressing the generation of high-order aberrations and improving the imaging quality of the optical lens.

[0087] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: 3.0 < TTL / IH < 4.0. Satisfying the above range is conducive to balancing the total length of the optical lens and the imaging quality.

[0088] In some embodiments, the optical total length TTL of the optical lens and the effective focal length f satisfy: 6.2 < TTL / f < 7.2. Satisfying the above range, the length and volume of the optical lens can be effectively limited, and miniaturization of the optical lens is achieved.

[0089] In order to make the system have better optical performance, a plurality of aspherical lenses are used in the lens, and each aspherical surface shape of the optical lens satisfies the following equation:

[0090]

[0091] Wherein, z is the distance of the curved surface and the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, A, B, C, D, E and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order curved surface coefficients respectively.

[0092] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.

[0093] Embodiment 1

[0094] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the application, and the optical lens comprises, along the optical axis from the object side to the imaging surface S18, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0095] The first lens L1 has negative focal power, the object side S1 is a concave surface, and the image side S2 is a concave surface; the second lens L2 has positive focal power, the object side S3 is a convex surface, and the image side S4 is a convex surface; the third lens L3 has positive focal power, the object side S5 is a convex surface, and the image side S6 is a convex surface; the fourth lens L4 has negative focal power, the object side S7 is a convex surface, and the image side is a concave surface; the fifth lens L5 has positive focal power, the object side is a convex surface, and the image side S9 is a convex surface; the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens, and the cemented surface is S8; the sixth lens L6 has negative focal power, the object side S10 is a concave surface, and the image side S11 is a concave surface; the seventh lens L7 has positive focal power, the object side S12 is a convex surface at the near optical axis, and the image side S13 is a concave surface at the near optical axis; the filter G1 has a plane object side S14 and a plane image side S15; and the protective glass G2 has a plane object side S16 and a plane image side S17.

[0096] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0097] Table 1-1

[0098]

[0099] The curve coefficients of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0100] Table 1-2

[0101]

[0102] Figure 2 The field curvature curve diagram of Embodiment 1 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.03 mm, which shows that the optical lens can very well correct the field curvature.

[0103] Figure 3 The relative luminance curve diagram of Embodiment 1 is shown, which represents the relative luminance values of different field angles on the imaging surface, the horizontal axis represents the half field of view (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 70% at the maximum half field of view, which shows that the optical lens has very good relative luminance.

[0104] Figure 4A modulation transfer function (MTF) curve of the optical lens of Embodiment 1 is shown, which represents the imaging modulation degree of different spatial frequencies in each field of view, the horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in low and high frequency cases.

[0105] Figure 5 An axial aberration curve of Embodiment 1 is shown, which represents the aberration of the optical axis at the imaging surface at 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 figure, the shift of the axial aberration is controlled within ±8 μm, which shows that the optical lens can better correct the axial aberration.

[0106] Figure 6 A curve of the axial chromatic aberration of Embodiment 1 is shown, which represents the chromatic aberration of different image heights on the imaging surface at each wavelength relative to the center wavelength (0.55 μm), the horizontal axis represents the axial chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, which shows that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0107] Embodiment 2

[0108] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens provided in Embodiment 2 of the present application, which comprises, along the optical axis from the object side to the imaging surface S18, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0109] The first lens L1 has negative focal power, the object side S1 is a concave surface, and the image side S2 is a concave surface; the second lens L2 has positive focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface; the third lens L3 has positive focal power, the object side S5 is a convex surface, and the image side S6 is a convex surface; the fourth lens L4 has negative focal power, the object side S7 is a convex surface, and the image side is a concave surface; the fifth lens L5 has positive focal power, the object side is a convex surface, and the image side S9 is a convex surface; the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens, and the cemented surface is S8; the sixth lens L6 has negative focal power, the object side S10 is a concave surface, and the image side S11 is a concave surface; the seventh lens L7 has positive focal power, the object side S12 is a convex surface at the near optical axis, and the image side S13 is a concave surface at the near optical axis; the filter G1 has a plane object side S14 and a plane image side S15; and the protective glass G2 has a plane object side S16 and a plane image side S17.

[0110] The related parameters of the lenses in the optical lens in Example 2 are shown in Table 2-1.

[0111] Table 2-1

[0112]

[0113] The curve coefficients of the aspheric lenses of the optical lens in Example 2 are shown in Table 2-2.

[0114] Table 2-2

[0115]

[0116] Figure 8 to Figure 12 The field curvature curve, the relative luminance curve, the modulation transfer function (MTF) curve, the axial aberration curve and the transverse chromatic aberration curve of Example 2 are shown respectively. As can be seen from the figures, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.035 mm, which indicates that the optical lens can correct the field curvature very well; the relative luminance value of the optical lens is still greater than 60% at the maximum half field angle, which indicates that the optical lens has very good relative luminance; the MTF value of the optical lens is greater than 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low frequency and high frequency conditions; the shift of the axial aberration is controlled within ±8 μm, which indicates that the optical lens can correct the axial aberration well; the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2.5 μm, which indicates that the optical lens can correct the chromatic aberration of the edge of the field of view and the secondary spectrum of the entire image surface very well.

[0117] Example 3

[0118] Please refer toFigure 13 Figure 3 shows a structural diagram of an optical lens provided in Embodiment 3 of the present application, which comprises, in sequence from the object side to the imaging surface S18 along the optical axis, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0119] The first lens L1 has a negative focal length, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens L2 has a positive focal length, the object side S3 is a concave surface, and the image side S4 is a convex surface. The third lens L3 has a positive focal length, the object side S5 is a convex surface, and the image side S6 is a convex surface. The fourth lens L4 has a negative focal length, the object side S7 is a convex surface, and the image side S8 is a concave surface. The fifth lens L5 has a positive focal length, the object side S9 is a convex surface, and the image side is a convex surface. The sixth lens L6 has a negative focal length, the object side is a concave surface, and the image side S11 is a concave surface. The fifth lens L5 and the sixth lens L6 are cemented to form a cemented lens, and the cemented surface is S10. The seventh lens L7 has a positive focal length, the object side S12 is a convex surface, and the image side S13 is a convex surface near the optical axis. The filter G1 has a flat object side S14 and a flat image side S15. The protective glass G2 has a flat object side S16 and a flat image side S17.

[0120] The related parameters of the lenses in the optical lens in Embodiment 3 are shown in Table 3-1.

[0121] Table 3-1

[0122]

[0123]

[0124] The curve coefficients of the aspherical lenses in the optical lens in Embodiment 3 are shown in Table 3-2.

[0125] Table 3-2

[0126]

[0127] Figure 14 to Figure 18The field curvature curve, the relative luminance curve, the modulation transfer function (MTF) curve, the axial aberration curve and the axial chromatic aberration curve of the optical lens of embodiment 3 are shown in the figures. As can be seen from the figures, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.03 mm, which indicates that the optical lens can correct the field curvature very well; the relative luminance value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has very good relative luminance; the MTF value of the optical lens is all above 0.4 within the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view within the range of 0-160 lp / mm, which indicates that the optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency; the offset of the axial aberration is controlled within ±8 μm, which indicates that the optical lens can correct the axial aberration well; the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, which indicates that the optical lens can correct the chromatic aberration of the edge of the field of view and the secondary spectrum of the whole image surface very well.

[0128] Embodiment 4

[0129] Referring to Figure 19 , a structure schematic diagram of the optical lens provided in embodiment 4 of the present application is shown, and the optical lens comprises, along the optical axis from the object side to the imaging surface S18, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0130] The first lens L1 has negative focal power, the object side S1 is a concave surface, and the image side S2 is a concave surface; the second lens L2 has positive focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface; the third lens L3 has positive focal power, the object side S5 is a convex surface, and the image side S6 is a convex surface; the fourth lens L4 has negative focal power, the object side S7 is a convex surface, and the image side S8 is a concave surface; the fifth lens L5 has positive focal power, the object side S9 is a convex surface, and the image side is a convex surface; the sixth lens L6 has negative focal power, the object side is a concave surface, and the image side S11 is a concave surface, and the fifth lens L5 and the sixth lens L6 are cemented to form a cemented lens, and the cemented surface is S10; the seventh lens L7 has positive focal power, the object side S12 is a convex surface, and the image side S13 is a convex surface at the near optical axis; the filter G1 has a plane object side S14 and a plane image side S15; the protective glass G2 has a plane object side S16 and a plane image side S17.

[0131] The related parameters of the lenses in the optical lens of embodiment 4 are shown in Table 4-1.

[0132] Table 4-1

[0133]

[0134] The curve coefficients of the aspherical lens of the optical lens in embodiment 4 are shown in table 4-2.

[0135] Table 4-2

[0136]

[0137] Figure 20 to Figure 24 The field curvature curve, the relative luminance curve, the modulation transfer function (MTF) curve, the axial aberration curve and the transverse chromatic aberration curve of embodiment 4 are shown respectively. It can be seen from the figures that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.04 mm, which indicates that the optical lens can correct the field curvature very well; the relative luminance value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has very good relative luminance; the MTF value of the optical lens is all above 0.4 within the full field of view, and in the range of 0-160 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and the optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency; the offset of the axial aberration is controlled within ±11 μm, which indicates that the optical lens can correct the axial aberration well; the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, which indicates that the optical lens can correct the chromatic aberration of the edge of the field of view and the secondary spectrum of the whole image surface very well.

[0138] Embodiment 5

[0139] Please refer to Figure 25 , which is a structural schematic diagram of the optical lens provided in embodiment 5 of the present application, and the optical lens comprises, along the optical axis from the object side to the imaging surface S18, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0140] The first lens L1 has negative focal power, the object side S1 is a concave surface, and the image side S2 is a concave surface; the second lens L2 has positive focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface; the third lens L3 has positive focal power, the object side S5 is a convex surface, and the image side S6 is a convex surface; the fourth lens L4 has negative focal power, the object side S7 is a concave surface, and the image side is a concave surface; the fifth lens L5 has positive focal power, the object side is a convex surface, and the image side S9 is a convex surface; the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens, and the cemented surface is S8; the sixth lens L6 has negative focal power, the object side S10 is a concave surface, and the image side S11 is a convex surface; the seventh lens L7 has positive focal power, the object side S12 is a convex surface at the near optical axis, and the image side S13 is a concave surface at the near optical axis; the filter G1 has a plane object side S14 and a plane image side S15; and the protective glass G2 has a plane object side S16 and a plane image side S17.

[0141] The related parameters of the lenses in the optical lens in embodiment 5 are shown in table 5-1.

[0142] Table 5-1

[0143]

[0144]

[0145] The surface coefficients of the aspheric lenses of the optical lens in embodiment 5 are shown in table 5-2.

[0146] Table 5-2

[0147]

[0148] Figure 25 to Figure 30 The field curvature curve, the relative luminance curve, the modulation transfer function (MTF) curve, the axial aberration curve, and the transverse chromatic aberration curve of embodiment 5 are shown respectively. As can be seen from the figures, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.035 mm, which indicates that the optical lens can correct the field curvature very well; the relative luminance value of the optical lens is still greater than 70% at the maximum half field of view, which indicates that the optical lens has very good relative luminance; the MTF value of the optical lens is greater than 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and the optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency; the shift of the axial aberration is controlled within ±10 μm, which indicates that the optical lens can correct the axial aberration well; the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, which indicates that the optical lens can correct the chromatic aberration of the edge of the field of view and the secondary spectrum of the entire image surface very well.

[0149] Please refer to Table 6 for the optical characteristics of the above-mentioned embodiments, including the effective focal length f, the maximum half field angle θ, the entrance pupil diameter EPD, the total track length TTL, the F-number FNO, the image height IH, and the numerical values corresponding to each conditional expression in the embodiments of the optical lens.

[0150] Table 6

[0151] Parameters and conditional expressions Example 1 Example 2 Example 3 Example 4 Example 5 f (mm) 4.29 4.32 4.33 4.34 4.72 θ (°) 70.00 70.00 70.00 80.00 55.00 EPD (mm) 2.68 2.70 2.71 2.71 2.95 TTL (mm) 29.90 29.90 29.90 29.64 29.91 FNO 1.60 1.60 1.60 1.60 1.60 IH (mm) 8.80 8.84 8.90 9.38 8.06 CRA (°) 20.00 15.00 20.00 20.00 19.26 FOV / FNO (°) 87.50 87.50 87.50 100.00 68.75 IH / EPD 3.28 3.27 3.29 3.46 2.73 FOVxf / IH (°) 68.32 68.41 68.15 74.06 64.38 D1 / IH / tan(θ) 0.46 0.49 0.49 0.23 0.97 f2 / f3 2.54 2.14 2.02 1.20 1.65 f4 / f5 -2.25 -1.55 -4.58 -3.82 -0.92 f1 / f -1.39 -1.56 -1.81 -1.37 -1.60 f2 / f 6.36 5.52 5.41 3.60 3.07 f3 / f 2.50 2.58 2.67 3.00 1.86 TTL / IH 3.40 3.38 3.36 3.16 3.71 TTL / f 6.97 6.92 6.90 6.83 6.34

[0152] In summary, the optical lens of the embodiments of the present application realizes the effects of large field of view, large aperture, and miniaturization by reasonably matching the lens shape and power combination between each lens.

[0153] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0154] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis: a first lens with negative refractive power, whose image side surface is concave; a second lens with positive refractive power, whose image side surface is convex; a stop; a third lens with positive refractive power, whose object side surface is convex and whose image side surface is convex; a fourth lens with negative refractive power, whose image side surface is concave; a fifth lens with positive refractive power, whose object side surface is convex and whose image side surface is convex; a sixth lens with negative refractive power, whose object side surface is concave; a seventh lens with positive refractive power, whose object side surface is convex; wherein the maximum field angle FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 65°<FOV / FNO<105°; the effective focal length f of the optical lens and the effective focal length f1 of the first lens satisfy: -2.0<f1 / f<-1.

2.

2. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.5<IH / EPD<3.

5.

3. The optical lens of claim 1, wherein, the maximum field angle FOV of the optical lens, the effective focal length f of the optical lens, and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 65°<FOV×f / IH<75°.

4. The optical lens of claim 1, wherein, the effective aperture D1 of the object side surface of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum half field angle θ of the optical lens satisfy: 0.2<D1 / IH / tan(θ)<1.

0.

5. The optical lens of claim 1, wherein, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.0<f2 / f3<2.

7.

6. The optical lens of claim 1, wherein, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -5.0<f4 / f5<-0.

8.

7. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the effective focal length f3 of the third lens satisfy: 1.6<f3 / f<2.

8.

8. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 3.0<TTL / IH<4.

0.

9. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2<TTL / f<7.2.

Images