A wide-angle lens

Abstract

The present invention discloses a wide-angle lens, comprising a first lens, a second lens, a third lens, a stop, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along an optical axis from the object side to the image side, wherein the first lens has a negative refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a positive refractive power, the fifth lens has a negative refractive power, and the sixth lens has a positive refractive power, wherein the first lens and the third lens are both glass lenses, and the second lens, the fourth lens, the fifth lens, and the sixth lens are all plastic aspheric lenses. The wide-angle lens of the present invention adopts a 2G4P glass-plastic hybrid structure, and the overall size of the lens is small and easy to install and use; the field of view angle VFOV of the lens is 150°, and the MTF of the lens at 83lp / mm is greater than 0.5, so that the lens has a wide angle and good imaging quality, while also being able to effectively reduce the cost of the lens.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a wide-angle lens. Background Art

[0002] With the continuous advancement of science and technology and the continuous development of society, optical imaging lenses have also developed rapidly in recent years and are widely used in various fields such as smartphones, tablets, video conferencing, vehicle monitoring, security monitoring, etc. Therefore, the requirements for optical imaging lenses are also getting higher and higher.

[0003] A wide-angle lens is a photographic lens with a shorter focal length than a standard lens and a wider viewing angle than a standard lens, and a longer focal length than a fisheye lens but a narrower viewing angle than a fisheye lens. Existing wide-angle lenses commonly suffer from the following drawbacks: The lens's total optical length (TTL) is excessively long, and the excessive number of lens elements leads to high overall cost and weight, and limited installation and use. Conventional wide-angle lenses have an excessively large angle of incidence, resulting in poor image quality at the edges of the field of view. To improve resolution and correct chromatic aberration, commercially available wide-angle lenses often use multiple pieces of glass or cemented lenses, resulting in high cost and excessive size.

[0004] In view of this, the inventors of the present application invented a wide-angle lens. Summary of the Invention

[0005] The object of the present invention is to provide a wide-angle lens with compact structure, small size, good imaging quality and low cost.

[0006] To achieve the above object, the present invention adopts the following technical solution: a wide-angle lens, comprising a first lens, a second lens, a third lens, a stop, a fourth lens, a fifth lens, and a sixth lens, arranged in sequence along an optical axis from the object side to the image side, wherein the first to sixth lenses each include an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes;

[0007] The first lens has a negative refractive power, and the object-side surface of the first lens is convex, and the image-side surface is concave;

[0008] The second lens has a negative refractive power, and the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave;

[0009] The third lens has positive refractive power, and the object-side surface and image-side surface of the third lens are convex;

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

[0011] The fifth lens element has negative refractive power, and the object-side surface and image-side surface of the fifth lens element are concave;

[0012] The sixth lens has a positive refractive power, and the object side surface of the sixth lens is convex and the image side surface is convex;

[0013] Among them, the first lens and the third lens are both glass lenses, and the second lens, the fourth lens, the fifth lens, and the sixth lens are all plastic aspherical lenses.

[0014] Further, this wide-angle lens satisfies: 4 < |f1 / f| < 5, 2 < |f2 / f| < 3, 2 < |f3 / f| < 3, 1.5 < |f4 / f| < 2.5, 1 < |f5 / f| < 2, 1.5 < |f6 / f| < 3, where f is the overall focal length of the lens, and f1, f2, f3, f4, f5, f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively.

[0015] Further, this wide-angle lens satisfies: -7 < f1 < -5.5, -3 < f2 < -2, 3 < f3 < 4, 2 < f4 < 3, -3 < f5 < -1.5, 2 < f6 < 3, where f1, f2, f3, f4, f5, f6 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively.

[0016] Further, this wide-angle lens satisfies: 1.7 < nd1 < 1.9, 40 < vd1 < 60, 1.5 < nd2 < 1.7, 50 < vd2 < 60, 1.7 < nd3 < 1.85, 19 < vd3 < 30, 1.5 < nd4 < 1.7, 50 < vd4 < 70, 1.6 < nd5 < 1.7, 18 < vd5 < 25, 1.5 < nd6 < 1.7, 50 < vd6 < 60,

[0017] Among them, nd1, nd2, nd3, nd4, nd5, nd6 are the refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5, vd6 are the dispersion coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively.

[0018] Further, this wide-angle lens satisfies: 2.0 < ALT / AAG < 3.0, where ALT is the sum of the central thicknesses of the first lens to the sixth lens on the optical axis, and AAG is the sum of the air gaps of the first to sixth lenses on the optical axis.

[0019] Further, this wide-angle lens satisfies: 4.5 < CT6 / CT5 < 5.5, where CT6 is the central thickness of the sixth lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis.

[0020] Furthermore, the wide-angle lens satisfies: 2 <f 123 / f 456 <3, where f 123 is the combined focal length of the first, second and third lenses, f 456 is the combined focal length of the fourth lens, the fifth lens, and the sixth lens.

[0021] Furthermore, the wide-angle lens satisfies: 2 <f 456 / f<3, where f 456 is the combined focal length of the fourth lens, the fifth lens, and the sixth lens, and f is the overall focal length of the lens.

[0022] Furthermore, the total optical length TTL of the wide-angle lens satisfies: TTL<14.0mm.

[0023] Furthermore, the field of view of the wide-angle lens satisfies: VFOV=150°, DFOV>168°.

[0024] After adopting the above technical solution, the present invention has the following advantages:

[0025] The wide-angle lens of the present invention adopts a 2G4P glass-plastic hybrid structure, and the overall size of the lens is small and easy to install and use; the field of view angle VFOV of the lens is 150°, and the MTF of the lens at 83lp / mm is greater than 0.5, so that the lens has a wide angle and good imaging quality, while also being able to effectively reduce the cost of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a light path diagram of Example 1 of the present invention;

[0027] Figure 2 This is an MTF curve of the lens in Example 1 of the present invention under visible light 435nm-650nm;

[0028] Figure 3 This is a defocus curve diagram of the lens of Example 1 of the present invention under visible light 435nm-650nm;

[0029] Figure 4 This is a graph showing the lateral chromatic aberration of the lens of Example 1 of the present invention under visible light of 435nm-650nm;

[0030] Figure 5 This is a graph showing the longitudinal chromatic aberration of the lens of Example 1 of the present invention under visible light of 435nm-650nm;

[0031] Figure 6 This is a diagram of field curvature and distortion of the lens in Example 1 of the present invention under visible light of 435nm-650nm;

[0032] Figure 7 This is a light path diagram of Example 2 of the present invention;

[0033] Figure 8 This is an MTF curve of the lens of Example 2 of the present invention under visible light 435nm-650nm;

[0034] Figure 9 This is a defocus curve diagram of the lens of Example 2 of the present invention under visible light 435nm-650nm;

[0035] Figure 10 This is a graph showing the lateral chromatic aberration of the lens of Example 2 of the present invention under visible light of 435nm-650nm;

[0036] Figure 11 This is a graph showing the longitudinal chromatic aberration of the lens of Example 2 of the present invention under visible light of 435nm-650nm;

[0037] Figure 12 This is a diagram of field curvature and distortion of the lens in Example 2 of the present invention under visible light of 435nm-650nm;

[0038] Figure 13 This is a light path diagram of Example 3 of the present invention;

[0039] Figure 14 This is an MTF curve of the lens of Example 3 of the present invention under visible light 435nm-650nm;

[0040] Figure 15 This is a defocus curve diagram of the lens of Example 3 of the present invention under visible light 435nm-650nm;

[0041] Figure 16 This is a graph showing the lateral chromatic aberration of the lens of Example 3 of the present invention under visible light of 435nm-650nm;

[0042] Figure 17 This is a graph showing the longitudinal chromatic aberration of the lens of Example 3 of the present invention under visible light of 435nm-650nm;

[0043] Figure 18 This is a diagram of field curvature and distortion of the lens of Example 3 of the present invention under visible light 435nm-650nm;

[0044] Figure 19 This is a light path diagram of Example 4 of the present invention;

[0045] Figure 20 This is an MTF curve of the lens of Example 4 of the present invention under visible light 435nm-650nm;

[0046] Figure 21This is a defocus curve diagram of the lens of Example 4 of the present invention under visible light 435nm-650nm;

[0047] Figure 22 This is a graph showing the lateral chromatic aberration of the lens of Example 4 of the present invention under visible light of 435nm-650nm;

[0048] Figure 23 This is a graph showing the longitudinal chromatic aberration of the lens of Example 4 of the present invention under visible light ranging from 435nm to 650nm;

[0049] Figure 24 This is a diagram of field curvature and distortion of the lens of Example 4 of the present invention under visible light 435nm-650nm;

[0050] Figure 25 This is a light path diagram of Example 5 of the present invention;

[0051] Figure 26 This is an MTF curve of the lens of Example 5 of the present invention under visible light 435nm-650nm;

[0052] Figure 27 This is a defocus curve diagram of the lens of Example 5 of the present invention under visible light 435nm-650nm;

[0053] Figure 28 This is a graph showing the lateral chromatic aberration of the lens of Example 5 of the present invention under visible light of 435nm-650nm;

[0054] Figure 29 This is a graph showing the longitudinal chromatic aberration of the lens of Example 5 of the present invention under visible light ranging from 435nm to 650nm;

[0055] Figure 30 Graphs showing field curvature and distortion of the lens of Example 5 of the present invention under visible light ranging from 435nm to 650nm.

[0056] Description of reference numerals:

[0057] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Aperture stop; 8. Protective sheet. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0059] Here, "a lens having a positive (or negative) refractive power" means that the lens's paraxial refractive power, calculated using Gaussian optics theory, is positive (or negative). The "object-side (or image-side) of a lens" is defined as the specific area of the lens surface through which the imaging light passes. The concavity or convexity of a lens's surface can be determined using the same method commonly used by those skilled in the art: the sign of the radius of curvature (abbreviated as R value). R values are commonly used in optical design software such as Zemax or CodeV. R values are also commonly found in lens data sheets within optical design software. For the object-side surface, a positive R value indicates a convex surface; a negative R value indicates a concave surface. Conversely, for the image-side surface, a positive R value indicates a concave surface; a negative R value indicates a convex surface.

[0060] The present invention discloses a wide-angle lens, comprising a first lens 1, a second lens 2, a third lens 3, an aperture 7, a fourth lens 4, a fifth lens 5, and a sixth lens 6, which are arranged in sequence along an optical axis from the object side to the image side. The first lens 1 to the sixth lens 6 each include an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes.

[0061] The first lens 1 has a negative refractive power, and the object side surface of the first lens 1 is convex, and the image side surface is concave;

[0062] The second lens element 2 has a negative refractive power, and the object side surface of the second lens element 2 is convex, and the image side surface is concave;

[0063] The third lens element 3 has positive refractive power, and the object-side surface and image-side surface of the third lens element 3 are convex;

[0064] The fourth lens element 4 has positive refractive power, and the object-side surface and image-side surface of the fourth lens element 4 are convex.

[0065] The fifth lens element 5 has a negative refractive power, and the object-side surface and the image-side surface of the fifth lens element 5 are concave.

[0066] The sixth lens element 6 has positive refractive power, and the object-side surface and image-side surface of the sixth lens element 6 are convex.

[0067] The first lens 1 and the third lens 3 are both glass lenses, and the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are all plastic aspherical lenses.

[0068] The wide-angle lens satisfies: 4 < |f1 / f| < 5, 2 < |f2 / f| < 3, 2 < |f3 / f| < 3, 1.5 < |f4 / f| < 2.5, 1 < |f5 / f| < 2, 1.5 < |f6 / f| < 3, where f is the overall focal length of the lens, and f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6, respectively.

[0069] The wide-angle lens satisfies: -7 < f1 < -5.5, -3 < f2 < -2, 3 < f3 < 4, 2 < f4 < 3, -3 < f5 < -1.5, 2 < f6 < 3, where f1, f2, f3, f4, f5, and f6 are the focal length values of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6, respectively.

[0070] The wide-angle lens satisfies: 1.7 < nd1 < 1.9, 40 < vd1 < 60, 1.5 < nd2 < 1.7, 50 < vd2 < 60, 1.7 < nd3 < 1.85, 19 < vd3 < 30, 1.5 < nd4 < 1.7, 50 < vd4 < 70, 1.6 < nd5 < 1.7, 18 < vd5 < 25, 1.5 < nd6 < 1.7, 50 < vd6 < 60.

[0071] Where, nd1, nd2, nd3, nd4, nd5, and nd6 are the refractive indices of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are the dispersion coefficients of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, and sixth lens 6, respectively.

[0072] The wide-angle lens satisfies: 2.0 < ALT / AAG < 3.0, where ALT is the sum of the central thicknesses of the first lens 1 to the sixth lens 6 on the optical axis, and AAG is the sum of the air gaps of the first to sixth lenses 6 on the optical axis.

[0073] The wide-angle lens satisfies: 4.5 < CT6 / CT5 < 5.5, where CT6 is the central thickness of the sixth lens 6 on the optical axis, and CT5 is the central thickness of the fifth lens 5 on the optical axis.

[0074] The wide-angle lens satisfies: 2 < f123 / f456 < 3, where f123 is the combined focal length of the first lens 1, second lens 2, and third lens 3, and f456 is the combined focal length of the fourth lens 4, fifth lens 5, and sixth lens 6.

[0075] The wide-angle lens satisfies: 2 < f456 / f < 3, where f456 is the combined focal length of the fourth lens 4, the fifth lens 5, and the sixth lens 6, and f is the overall focal length of the lens.

[0076] The wide-angle lens adopts a design of four plastic aspherical lenses and two glass spherical lenses, which is beneficial to correcting secondary spectrum and high-order aberrations. At the same time, high-refractive-index materials are selected for the glass lenses, which can better optimize the optical structure and facilitate the lens structure design, reducing the lens cost.

[0077] The wide-angle lens adopts a hybrid glass and plastic structure design, which can well correct the temperature drift of the lens, enabling the lens to still ensure its working state under different temperature conditions, thereby effectively ensuring the imaging quality.

[0078] The overall optical length TTL of the wide-angle lens satisfies: TTL < 14.0 mm. The lens has a short overall length and a small volume, making its installation and use extremely convenient.

[0079] The field angle of the wide-angle lens satisfies: VFOV = 150°, DFOV > 168°; the combined focal length of all lenses is 1.2 mm < EFL < 1.35 mm, the maximum aperture of the lens is F / NO = 2.0, the overall field of view is large, the structure is compact, and the practicability is strong.

[0080] The wide-angle lens of the present invention will be described in detail below with specific embodiments.

[0081] Example 1

[0082] Refer to Figure 1 As shown, the present invention discloses a wide-angle lens, which includes a first lens 1, a second lens 2, a third lens 3, an aperture 7, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged in sequence along an optical axis from the object side to the image side. Each of the first lens 1 to the sixth lens 6 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through.

[0083] The first lens 1 has a negative refractive power, and the object side of the first lens 1 is convex, and the image side is concave.

[0084] The second lens 2 has a negative refractive power, and the object side of the second lens 2 is convex, and the image side is concave.

[0085] The third lens 3 has a positive refractive power, and the object side of the third lens 3 is convex, and the image side is convex. [[ID=^33]]

[0086] The fourth lens 4 has a positive refractive power, and the object side of the fourth lens 4 is convex, and the image side is convex.

[0087] The fifth lens element 5 has a negative refractive power, and the object-side surface and the image-side surface of the fifth lens element 5 are concave.

[0088] The sixth lens element 6 has positive refractive power, and the object-side surface and image-side surface of the sixth lens element 6 are convex.

[0089] The first lens 1 and the third lens 3 are both glass lenses, and the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are all plastic aspherical lenses.

[0090] The detailed optical data of this specific embodiment are shown in Table 1-1.

[0091] Table 1-1 Detailed optical data of Example 1

[0092]

[0093]

[0094] The equation for the surface curve of an aspheric lens is expressed as follows:

[0095]

[0096] in,

[0097] z: Depth of the aspheric surface (the vertical distance between the point y away from the optical axis on the aspheric surface and the tangent plane tangent to the vertex on the optical axis of the aspheric surface);

[0098] c: the vertex curvature of the aspheric surface;

[0099] K: Conic Constant;

[0100] radial distance;

[0101] r n : normalization radius (NRADIUS);

[0102] u:r / r n ;

[0103] a m : mth order Q con Coefficient (is the m th Q con coefficient);

[0104] Q m con : mth order Q conPolynomial th Q con polynomial).

[0105] The aspheric surface data of this embodiment is shown in Table 1-2.

[0106] Table 1-2 Aspheric surface data of Example 1

[0107]

[0108]

[0109] In this embodiment, please refer to the MTF curve of the lens under visible light 435nm-650nm. Figure 2 As can be seen from the figure, when the spatial frequency of this lens reaches 83lp / mm, the MTF value is greater than 0.5, the imaging quality is excellent, and the resolution of the lens is high.

[0110] Please refer to the defocus curve of the lens under visible light 435nm-650nm Figure 3 As can be seen from the figure, the defocus curves of each field of view of this lens under visible light are relatively concentrated, and the defocus amount is small.

[0111] Please refer to the lateral chromatic aberration curve of the lens under visible light 435nm-650nm Figure 4 ,As can be seen from the figure, the color difference is less than 13um, the color difference is small, and the ,image color reproduction is high.

[0112] Please refer to the longitudinal chromatic aberration curve of the lens under visible light 435nm-650nm Figure 5 As can be seen from the figure, the axial chromatic aberration is less than ±0.03mm, the color reproduction is good, the color difference is small, and the blue-purple edge phenomenon is not obvious.

[0113] Please refer to the field curvature and distortion diagram of the lens under visible light 435nm-650nm Figure 6 As can be seen from the figure, the field curvatures of each wavelength basically coincide, and the chromatic aberration is small. At the same time, the optical distortion of the system is <|35%|, which controls the wide-angle distortion and improves the image quality.

[0114] Example 2

[0115] like Figure 7 As shown, the present embodiment is different from the embodiment 1 mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0116] The detailed optical data of this specific embodiment are shown in Table 2-1.

[0117] Table 2-1 Detailed optical data of Example 2

[0118]

[0119]

[0120] The aspheric surface data in this embodiment is shown in Table 2-2.

[0121] Table 2-2 Aspheric surface data of Example 2

[0122]

[0123] In this embodiment, please refer to the MTF curve of the lens under visible light 435nm-650nm. Figure 8 As can be seen from the figure, when the spatial frequency of this lens reaches 83lp / mm, the MTF value is greater than 0.5, the imaging quality is excellent, and the resolution of the lens is high.

[0124] Please refer to the defocus curve of the lens under visible light 435nm-650nm Figure 9 As can be seen from the figure, the defocus curves of each field of view of this lens under visible light are relatively concentrated, and the defocus amount is small.

[0125] Please refer to the lateral chromatic aberration curve of the lens under visible light 435nm-650nm Figure 10 ,As can be seen from the figure, the color difference is less than 12um, the color difference is small, and the ,image color reproduction is high.

[0126] Please refer to the longitudinal chromatic aberration curve of the lens under visible light 435nm-650nm Figure 11 As can be seen from the figure, the axial chromatic aberration is less than ±0.03mm, the color reproduction is good, the color difference is small, and the blue-purple edge phenomenon is not obvious.

[0127] Please refer to the field curvature and distortion diagram of the lens under visible light 435nm-650nm Figure 12 As can be seen from the figure, the field curvatures of each wavelength basically coincide, and the chromatic aberration is small. At the same time, the optical distortion of the system is <|-90%|, and the distortion is small, which controls the wide-angle distortion and improves the image quality.

[0128] Example 3

[0129] like Figure 13 As shown, the present embodiment is different from the embodiment 1 mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0130] The detailed optical data of this specific embodiment are shown in Table 3-1.

[0131] Table 3-1 Detailed optical data of Example 3

[0132]

[0133] The aspheric surface data in this embodiment is shown in Table 3-2.

[0134] Table 3-2 Aspheric surface data of Example 3

[0135]

[0136] In this embodiment, please refer to the MTF curve of the lens under visible light 435nm-650nm. Figure 14 As can be seen from the figure, when the spatial frequency of this lens reaches 83lp / mm, the MTF value is greater than 0.5, the imaging quality is excellent, and the resolution of the lens is high.

[0137] Please refer to the defocus curve of the lens under visible light 435nm-650nm Figure 15 As can be seen from the figure, the defocus curves of each field of view of this lens under visible light are relatively concentrated, and the defocus amount is small.

[0138] Please refer to the lateral chromatic aberration curve of the lens under visible light 435nm-650nm Figure 16 ,As can be seen from the figure, the color difference is less than 10.4um, the color difference is small, and the ,image color reproduction is high.

[0139] Please refer to the longitudinal chromatic aberration curve of the lens under visible light 435nm-650nm Figure 17 As can be seen from the figure, the axial chromatic aberration is less than ±0.03mm, the color reproduction is good, the color difference is small, and the blue-purple edge phenomenon is not obvious.

[0140] Please refer to the field curvature and distortion diagram of the lens under visible light 435nm-650nm Figure 18 As can be seen from the figure, the field curvatures of each wavelength basically coincide, and the chromatic aberration is small. At the same time, the optical distortion of the system is <|-90%|, and the distortion is small, which controls the wide-angle distortion and improves the image quality.

[0141] Example 4

[0142] like Figure 19 As shown, the present embodiment is different from the embodiment 1 mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0143] The detailed optical data of this specific embodiment are shown in Table 4-1.

[0144] Table 4-1 Detailed optical data of Example 4

[0145]

[0146] The aspheric surface data of this embodiment is shown in Table 4-2.

[0147] Table 4-2 Aspheric surface data of Example 4

[0148]

[0149]

[0150] In this embodiment, please refer to the MTF curve of the lens under visible light 435nm-650nm. Figure 20 As can be seen from the figure, when the spatial frequency of this lens reaches 83lp / mm, the MTF value is greater than 0.5, the imaging quality is excellent, and the resolution of the lens is high.

[0151] Please refer to the defocus curve of the lens under visible light 435nm-650nm Figure 21 As can be seen from the figure, the defocus curves of each field of view of this lens under visible light are relatively concentrated, and the defocus amount is small.

[0152] Please refer to the lateral chromatic aberration curve of the lens under visible light 435nm-650nm Figure 22 ,As can be seen from the figure, the color difference is less than 13um, the color difference is small, and the ,image color reproduction is high.

[0153] Please refer to the longitudinal chromatic aberration curve of the lens under visible light 435nm-650nm Figure 23 As can be seen from the figure, the axial chromatic aberration is less than ±0.04mm, the color reproduction is good, the color difference is small, and the blue-purple edge phenomenon is not obvious.

[0154] Please refer to the field curvature and distortion diagram of the lens under visible light 435nm-650nm Figure 24 As can be seen from the figure, the field curvatures of each wavelength basically coincide, and the chromatic aberration is small. At the same time, the optical distortion of the system is <|-90%|, and the distortion is small, which controls the wide-angle distortion and improves the image quality.

[0155] Example 5

[0156] like Figure 25 As shown, the present embodiment is different from the embodiment 1 mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0157] The detailed optical data of this specific embodiment are shown in Table 5-1.

[0158] Table 5-1 Detailed optical data of Example 5

[0159]

[0160]

[0161] The aspheric surface data of this embodiment is shown in Table 5-2.

[0162] Table 5-2 Aspheric surface data of Example 5

[0163]

[0164] In this embodiment, please refer to the MTF curve of the lens under visible light 435nm-650nm. Figure 26 As can be seen from the figure, when the spatial frequency of this lens reaches 83lp / mm, the MTF value is greater than 0.5, the imaging quality is excellent, and the resolution of the lens is high.

[0165] Please refer to the defocus curve of the lens under visible light 435nm-650nm Figure 27 As can be seen from the figure, the defocus curves of each field of view of this lens under visible light are relatively concentrated, and the defocus amount is small.

[0166] Please refer to the lateral chromatic aberration curve of the lens under visible light 435nm-650nm Figure 28 ,As can be seen from the figure, the color difference is less than 13um, the color difference is small, and the ,image color reproduction is high.

[0167] Please refer to the longitudinal chromatic aberration curve of the lens under visible light 435nm-650nm Figure 29 As can be seen from the figure, the axial chromatic aberration is less than ±0.04mm, the color reproduction is good, the color difference is small, and the blue-purple edge phenomenon is not obvious.

[0168] Please refer to the field curvature and distortion diagram of the lens under visible light 435nm-650nm Figure 30 As can be seen from the figure, the field curvatures of each wavelength basically coincide, and the chromatic aberration is small. At the same time, the optical distortion of the system is <|-90%|, and the distortion is small, which controls the wide-angle distortion and improves the image quality.

[0169] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A wide-angle lens, characterized in that: It includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along an optical axis from the object side to the image side. Each of the first lens to the sixth lens includes an object side facing the object side through which imaging light passes and an image side facing the image side through which imaging light passes; The first lens has a negative refractive power, the object side of the first lens is convex, and the image side is concave; The second lens has a negative refractive power, the object side of the second lens is convex, and the image side is concave; The third lens has a positive refractive power, the object side of the third lens is convex, and the image side is convex; The fourth lens has a positive refractive power, the object side of the fourth lens is convex, and the image side is convex; The fifth lens has a negative refractive power, the object side of the fifth lens is concave, and the image side is concave; The sixth lens has a positive refractive power, the object side of the sixth lens is convex, and the image side is convex; Among them, the first lens and the third lens are both glass lenses, and the second lens, the fourth lens, the fifth lens, and the sixth lens are all plastic aspherical lenses; This wide-angle lens satisfies: -7 < f1 < -5.5, -3 < f2 < -2, 3 < f3 < 4, 2 < f4 < 3, -3 < f5 < -1.5, 2 < f6 < 3, where f1, f2, f3, f4, f5, f6 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively.

2. The wide-angle lens according to claim 1, wherein: This wide-angle lens satisfies: 4 < |f1 / f| < 5, 2 < |f2 / f| < 3, 2 < |f3 / f| < 3, 1.5 < |f4 / f| < 2.5, 1 < |f5 / f| < 2, 1.5 < |f6 / f| < 3, where f is the overall focal length of the lens, and f1, f2, f3, f4, f5, f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively.

3. The wide-angle lens according to claim 1, wherein: This wide-angle lens satisfies: 1.7 < nd1 < 1.9, 40 < vd1 < 60, 1.5 < nd2 < 1.7, 50 < vd2 < 60, 1.7 < nd3 < 1.85, 19 < vd3 < 30, 1.5 < nd4 < 1.7, 50 < vd4 < 70, 1.6 < nd5 < 1.7, 18 < vd5 < 25, 1.5 < nd6 < 1.7, 50 < vd6 < 60, Among them, nd1, nd2, nd3, nd4, nd5, nd6 are the refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5, vd6 are the dispersion coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively.

4. The wide-angle lens according to claim 1, wherein: This wide-angle lens satisfies: 2.0 < ALT / AAG < 3.0, where ALT is the sum of the central thicknesses of the first lens to the sixth lens on the optical axis, and AAG is the sum of the air gaps of the first to sixth lenses on the optical axis.

5. A wide-angle lens according to claim 1 or 4, characterized in that: The wide-angle lens satisfies: 4.5 < CT6 / CT5 < 5.5, where CT6 is the central thickness of the sixth lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis.

6. The wide-angle lens according to claim 1, wherein: This wide-angle lens meets the following requirements: <f 123 / f 456 <3, where f 123 is the combined focal length of the first, second and third lenses, f 456 is the combined focal length of the fourth lens, the fifth lens, and the sixth lens.

7. A wide-angle lens according to claim 1 or 6, characterized in that: This wide-angle lens meets the following requirements: <f 456 / f<3, where f 456 is the combined focal length of the fourth lens, the fifth lens, and the sixth lens, and f is the overall focal length of the lens.

8. The wide-angle lens according to claim 1, wherein: The overall optical length TTL of the wide-angle lens satisfies: TTL < 14.0 mm.

9. The wide-angle lens according to claim 1, wherein: The field angle of the wide-angle lens satisfies: VFOV = 150°, DFOV > 168°.

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