A wide-angle low-distortion optical imaging lens

Abstract

The present invention relates to the field of lens technology. The present invention discloses a wide-angle, low-distortion optical imaging lens, comprising six lenses; the first lens and the second lens are both convex-concave lenses with negative refractive power; the third lens and the sixth lens are both convex-convex lenses with positive refractive power; the fourth lens is a plano-convex lens with positive refractive power, and the fifth lens is a concave-convex lens with negative refractive power; the object side and image side of the second lens and the sixth lens are both aspherical surfaces; the second lens and the sixth lens are made of plastic material, the first lens, the third lens, the fourth lens and the fifth lens are made of glass material, and the fourth lens and the fifth lens are glued to each other. The present invention has the advantages of short total length, small size, low cost; high resolution, good imaging quality; large field angle; good distortion control; and small temperature drift.

Description

Technical Field

[0001] The present invention belongs to the technical field of lenses, and in particular relates to a wide-angle and low-distortion optical imaging 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. Optical imaging lenses are widely used in various fields such as smart phones, tablets, video conferencing, vehicle monitoring, security monitoring, law enforcement recording, etc. Therefore, the requirements for optical imaging lenses are also increasing.

[0003] However, the optical imaging lenses currently on the market still have many shortcomings. For example, the total optical length is too large and there are too many lenses, which makes the overall cost of the lens too high and has limitations in installation and use; the edge distortion control is poor, which makes the captured image have obvious deformation, affecting the later image processing; the field of view is small, and the lens captures insufficient frames, making it difficult to meet the requirements of motion capture frames; the lens has a large temperature drift, and when the temperature disturbance is too large, it affects the imaging quality; the resolution is low, etc., which can no longer meet the increasing demands of consumers and is in urgent need of improvement. Summary of the invention

[0004] The object of the present invention is to provide a wide-angle, low-distortion optical imaging lens to solve the above-mentioned technical problems.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a wide-angle low-distortion optical imaging lens, which includes a first lens to a sixth lens in sequence along an optical axis from the object side to the image side; the first lens to the sixth lens each include an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through;

[0006] The first lens has a negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

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

[0008] The third lens has a positive refractive power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

[0009] The fourth lens element has a positive refractive power, the object side surface of the fourth lens element is a flat surface, and the image side surface of the fourth lens element is a convex surface;

[0010] The fifth lens element has a negative refractive power, the object side surface of the fifth lens element is a concave surface, and the image side surface of the fifth lens element is a convex surface;

[0011] The sixth lens element has a positive refractive power, the object side surface of the sixth lens element is a convex surface, and the image side surface of the sixth lens element is a convex surface;

[0012] The object side and the image side of the second lens and the sixth lens are both aspherical surfaces; the second lens and the sixth lens are made of plastic materials, the first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are glued to each other;

[0013] The optical imaging lens has only the above-mentioned first lens to sixth lens with refractive power.

[0014] Furthermore, the optical imaging lens further satisfies: -6mm < f1 < -5mm, -7mm < f2 < -5mm, 4mm < f3 < 5mm, 3mm < f4 < 4mm, -5mm < f5 < -3mm, 7mm < f6 < 9mm, where f1, f2, f3, f4, f5 and 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] Furthermore, the optical imaging lens further satisfies: 10mm < R11 < 15mm, 2mm < R12 < 5mm, 4mm < R21 < 6mm, 2mm < R22 < 4mm, 6mm < R31 < 8mm, -8mm < R32 < -6mm, -3mm < R42 < -1mm, -3mm < R51 < -1mm, -7mm < R52 < -5mm, 7mm < R61 < 9mm, -8mm < R62 < -5mm, where R11 and R12 are the curvature radii of the object side and the image side of the first lens respectively, R21 and R22 are the curvature radii of the object side and the image side of the second lens respectively, R31 and R32 are the curvature radii of the object side and the image side of the third lens respectively, R42 is the curvature radius of the image side of the fourth lens, R51 and R52 are the curvature radii of the object side and the image side of the fifth lens respectively, and R61 and R62 are the curvature radii of the object side and the image side of the sixth lens respectively.

[0016] Furthermore, the optical imaging lens further satisfies: 2 < |f1 / f| < 4, 2 < |f2 / f| < 4, 1 < |f3 / f| < 3, 1 < |f4 / f| < 3, 1 < |f5 / f| < 3, 2 < |f6 / f| < 4, 6 < |f45 / f| < 9, where f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f45 is the combined focal length of the fourth lens and the fifth lens.

[0017] Furthermore, the optical imaging lens further satisfies: vd4 - vd5 > 30, where vd4 is the dispersion coefficient of the fourth lens and vd5 is the dispersion coefficient of the fifth lens.

[0018] Further, the optical imaging lens further satisfies: 1.7 < nd1 < 1.9, 1.8 < nd3 < 2.0, 1.8 < nd5 < 2.0, where nd1, nd3, and nd5 are the refractive indices of the first lens, the third lens, and the fifth lens, respectively.

[0019] Furthermore, the optical imaging lens further satisfies: 40 < vd1 < 50, 1.5 < nd2 < 1.7, 20 < vd2 < 30, 30 < vd3 < 40, 1.7 < nd4 < 1.8, 45 < vd4 < 55, 17 < vd5 < 20, 1.5 < nd6 < 1.7, 50 < vd6 < 60, where nd2, nd4, and nd6 are the refractive indices of the second lens, the fourth lens, and the sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are the Abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively.

[0020] Further, the optical imaging lens further satisfies: 1.3 mm < SAG21 < 1.8 mm, 1.6 mm < SAG22 < 2 mm, where SAG21 and SAG22 are the sag heights of the object side and the image side of the second lens, respectively.

[0021] Further, the object side and the image side of the second lens and the sixth lens are both 16th-order even aspheres.

[0022] Further, it further includes a diaphragm, and the diaphragm is disposed between the third lens and the fourth lens.

[0023] Advantageous technical effects of the present invention:

[0024] The present invention uses six lenses and, through corresponding designs of each lens, has the advantages of low cost, short overall length, small overall volume, convenient installation and use; perfect distortion control, small edge distortion of the captured picture, which is beneficial to post-processing of images; large field of view, large captured picture range, and high image resolution; small temperature drift, and can well maintain the working state at various temperatures. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0027] Figure 2This is the MTF diagram of visible light 0.435-0.656 μm of Example 1 of the present invention;

[0028] Figure 3 This is a defocus curve diagram of visible light 0.435-0.656 μm according to the first embodiment of the present invention;

[0029] Figure 4 This is a lateral chromatic aberration curve of visible light at 0.546 μm according to Example 1 of the present invention;

[0030] Figure 5 is a longitudinal aberration curve diagram of the first embodiment of the present invention;

[0031] Figure 6 Schematic diagram of field curvature and distortion curves of Embodiment 1 of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0033] Figure 8 This is the MTF diagram of visible light 0.435-0.656 μm according to the second embodiment of the present invention;

[0034] Fig. 9 This is a defocus curve diagram of visible light 0.435-0.656 μm according to the second embodiment of the present invention;

[0035] Fig.10 This is a lateral chromatic aberration curve diagram of visible light 0.546 μm according to Example 2 of the present invention;

[0036] Fig.11 is a longitudinal aberration curve diagram of the second embodiment of the present invention;

[0037] Fig.12 Schematic diagram of field curvature and distortion curves of the second embodiment of the present invention;

[0038] Fig.13 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0039] Fig.14 This is the MTF diagram of visible light 0.435-0.656 μm of Example 3 of the present invention;

[0040] Fig.15 This is a defocus curve diagram of visible light 0.435-0.656 μm according to Embodiment 3 of the present invention;

[0041] Fig.16 This is a lateral chromatic aberration curve diagram of visible light 0.546 μm according to Embodiment 3 of the present invention;

[0042] Fig.17 is a longitudinal aberration curve diagram of the third embodiment of the present invention;

[0043] Fig.18 Schematic diagram of field curvature and distortion curves of Embodiment 3 of the present invention;

[0044] Fig.19 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0045] Fig. 20 This is the MTF diagram of visible light 0.435-0.656 μm according to the fourth embodiment of the present invention;

[0046] Fig.21 This is a defocus curve diagram of visible light 0.435-0.656 μm according to Embodiment 4 of the present invention;

[0047] Fig. 22 This is a lateral chromatic aberration curve of visible light at 0.546 μm according to Embodiment 4 of the present invention;

[0048] Fig.23 is a longitudinal aberration curve diagram of the fourth embodiment of the present invention;

[0049] Fig.24 Schematic diagram of field curvature and distortion curves of Embodiment 4 of the present invention;

[0050] Fig.25 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0051] Fig.26 This is the MTF diagram of visible light 0.435-0.656 μm of Example 5 of the present invention;

[0052] Fig. 27 This is a defocus curve diagram of visible light 0.435-0.656 μm according to Embodiment 5 of the present invention;

[0053] Fig.28 This is a lateral chromatic aberration curve of visible light at 0.546 μm according to Embodiment 5 of the present invention;

[0054] Fig.29 is a longitudinal aberration curve diagram of Embodiment 5 of the present invention;

[0055] Fig.30 Schematic diagram of field curvature and distortion curves of Embodiment 5 of the present invention; DETAILED DESCRIPTION

[0056] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0057] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0058] Here, "a lens having a positive refractive power (or a negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "object side (or image side) of the lens" is defined as a specific range of the lens surface through which the imaging light passes. The concave and convexity of the lens surface can be judged according to the judgment method of ordinary knowledgeable people in this field, that is, the concave and convexity of the lens surface can be judged by the positive and negative signs of the radius of curvature (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet of optical design software. For the object side, when the R value is positive, the object side is judged to be convex; when the R value is negative, the object side is judged to be concave. Conversely, for the image side, when the R value is positive, the image side is judged to be concave; when the R value is negative, the image side is judged to be convex.

[0059] The present invention provides a wide-angle, low-distortion optical imaging lens, which includes a first lens to a sixth lens in sequence along an optical axis from an object side to an image side; the first lens to the sixth lens each include an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through.

[0060] The first lens has a negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface.

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

[0062] The third lens element has a positive refractive power, the object side surface of the third lens element is a convex surface, and the image side surface of the third lens element is a convex surface.

[0063] The fourth lens element has a positive refractive power, the object side surface of the fourth lens element is a flat surface, and the image side surface of the fourth lens element is a convex surface.

[0064] The fifth lens element has a negative refractive power, the object side surface of the fifth lens element is a concave surface, and the image side surface of the fifth lens element is a convex surface.

[0065] The sixth lens element has a positive refractive power, the object side surface of the sixth lens element is a convex surface, and the image side surface of the sixth lens element is a convex surface.

[0066] The object side surface and image side surface of the second lens and the sixth lens are both aspherical surfaces. The second lens and the sixth lens are made of plastic material, so that the optical imaging lens can compensate for the temperature drift of the base, reducing the influence of temperature disturbance on the imaging quality, and can meet the temperature conditions of -30℃-85℃ and maintain the picture clarity unchanged.

[0067] The first lens, the third lens, the fourth lens, and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are glued to each other; among the lenses of this optical imaging lens, only the above-mentioned first lens to the sixth lens have refractive power.

[0068] The present invention uses six lenses and, through corresponding designs for each lens, has the advantages of low cost, short total length, small overall volume, convenient installation and use; perfect distortion control, small deformation at the edge of the captured picture, which is beneficial for later image processing; large field of view, large captured picture range, and high image resolution; small temperature drift, and can maintain a good working state at various temperatures.

[0069] Preferably, this optical imaging lens further satisfies: -6mm < f1 < -5mm, -7mm < f2 < -5mm, 4mm < f3 < 5mm, 3mm < f4 < 4mm, -5mm < f5 < -3mm, 7mm < f6 < 9mm, where f1, f2, f3, f4, f5, and 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, reducing process sensitivity and improving product yield.

[0070] Preferably, this optical imaging lens further satisfies: 10mm < R11 < 15mm, 2mm < R12 < 5mm, 4mm < R21 < 6mm, 2mm < R22 < 4mm, 6mm < R31 < 8mm, -8mm < R32 < -6mm, -3mm < R42 < -1mm, -3mm < R51 < -1mm, -7mm < R52 < -5mm, 7mm < R61 < 9mm, -8mm < R62 < -5mm, where R11 and R12 are the curvature radii of the object side and the image side of the first lens respectively, R21 and R22 are the curvature radii of the object side and the image side of the second lens respectively, R31 and R32 are the curvature radii of the object side and the image side of the third lens respectively, R42 is the curvature radius of the image side of the fourth lens, R51 and R52 are the curvature radii of the object side and the image side of the fifth lens respectively, and R61 and R62 are the curvature radii of the object side and the image side of the sixth lens respectively, which is easy to process and manufacture and improves the overall performance.

[0071] Preferably, this optical imaging lens further satisfies: 2 < |f1 / f| < 4, 2 < |f2 / f| < 4, 1 < |f3 / f| < 3, 1 < |f4 / f| < 3, 1 < |f5 / f| < 3, 2 < |f6 / f| < 4, 6 < |f45 / f| < 9, where f is the focal length of this optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f45 is the combined focal length of the fourth lens and the fifth lens, reducing process sensitivity and improving product yield.

[0072] Preferably, the optical imaging lens further satisfies: vd4 - vd5 > 30, where vd4 is the dispersion coefficient of the fourth lens and vd5 is the dispersion coefficient of the fifth lens, for further correcting chromatic aberration.

[0073] Preferably, the optical imaging lens further satisfies: 1.7 < nd1 < 1.9, 1.8 < nd3 < 2.0, 1.8 < nd5 < 2.0, where nd1, nd3, and nd5 are the refractive indices of the first lens, the third lens, and the fifth lens respectively. In combination with the second lens and the sixth lens, it can better realize the miniaturization of the optical imaging lens and is beneficial to the structural design of the optical imaging lens.

[0074] More preferably, the optical imaging lens further satisfies: 40 < vd1 < 50, 1.5 < nd2 < 1.7, 20 < vd2 < 30, 30 < vd3 < 40, 1.7 < nd4 < 1.8, 45 < vd4 < 55, 17 < vd5 < 20, 1.5 < nd6 < 1.7, 50 < vd6 < 60, where nd2, nd4, and nd6 are the refractive indices of the second lens, the fourth lens, and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5, and 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, for further correcting chromatic aberration.

[0075] Preferably, the optical imaging lens further satisfies: 1.3mm < SAG21 < 1.8mm, 1.6mm < SAG22 < 2mm, where SAG21 and SAG22 are the sag heights of the object side and the image side of the second lens respectively, which is beneficial for distortion correction and good processability.

[0076] Preferably, the object side and the image side of the second lens and the sixth lens are both 16th - order even aspheres, which is beneficial for correcting secondary spectrum and higher - order aberrations.

[0077] Preferably, it further includes a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens to further improve the overall performance.

[0078] Hereinafter, specific embodiments will be used to describe the wide - angle and low - distortion optical imaging lens of the present invention in detail.

[0079] Embodiment 1

[0080] As Figure 1As shown, a wide-angle low-distortion optical imaging lens comprises, from the object side A1 to the image side A2 along an optical axis I, a first lens 1, a second lens 2, a third lens 3, an aperture 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a filter 8, a protective glass 9 and an imaging surface 10; each of the first lens 1 to the sixth lens 6 comprises an object-side surface facing the object side A1 and allowing imaging light to pass through, and an image-side surface facing the image side A2 and allowing imaging light to pass through.

[0081] The first lens 1 has a negative refractive power, an object-side surface 11 of the first lens 1 is a convex surface, and an image-side surface 12 of the first lens 1 is a concave surface.

[0082] The second lens element 2 has a negative refractive power, an object-side surface 21 of the second lens element 2 is a convex surface, and an image-side surface 22 of the second lens element 2 is a concave surface.

[0083] The third lens element 3 has a positive refractive power, an object-side surface 31 of the third lens element 3 is a convex surface, and an image-side surface 32 of the third lens element 3 is a convex surface.

[0084] The fourth lens element 4 has a positive refractive power. The object-side surface 41 of the fourth lens element 4 is a flat surface, and the image-side surface 42 of the fourth lens element 4 is a convex surface.

[0085] The fifth lens element 5 has a negative refractive power. The object-side surface 51 of the fifth lens element 5 is a concave surface, and the image-side surface 52 of the fifth lens element 5 is a convex surface.

[0086] The sixth lens element 6 has a positive refractive power. The object-side surface 61 of the sixth lens element 6 is a convex surface, and the image-side surface 62 of the sixth lens element 6 is a convex surface.

[0087] The object-side surfaces 21, 61 and the image-side surfaces 22, 62 of the second lens 2 and the sixth lens 6 are all aspherical surfaces; the second lens 2 and the sixth lens 6 are made of plastic material, the first lens 1, the third lens 3, the fourth lens 4 and the fifth lens 5 are made of glass material, and the fourth lens 4 and the fifth lens 5 are glued to each other.

[0088] In other embodiments, the aperture 7 may also be arranged between other lenses.

[0089] In this specific embodiment, the filter 8 may be an infrared filter or the like.

[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] In this specific embodiment, the object-side surfaces 21, 61 and the image-side surfaces 22, 62 are defined according to the following aspheric curve formula:

[0094]

[0095] in:

[0096] r is the distance from a point on the optical surface to the optical axis.

[0097] z is the vector height of the point along the optical axis.

[0098] c is the curvature of the surface.

[0099] k is the quadratic constant of the surface.

[0100] A2, A4, A6, A8, A 10 , A 12 , A 14 , A 16 They are: second-order, fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order aspheric coefficients.

[0101] Please refer to the following table for detailed parameter data of each aspheric surface:

[0102]

[0103]

[0104] Please refer to Table 6 for the numerical values ​​of the relevant conditional expressions of this specific embodiment.

[0105] The MTF transfer function curve of this specific embodiment is shown in Figure 2 , see the defocus curve for details Figure 3 It can be seen that the resolution is high, the central MTF value of the 250lp / mm spatial frequency is greater than 0.5, and the imaging quality is excellent; please refer to the lateral chromatic aberration curve Figure 4 , longitudinal aberration see Figure 5 , it can be seen that chromatic aberration and aberration correction are good; for field curvature and distortion diagrams, please refer to Figure 6 From (A) and (B), we can see that the field curvature and distortion are well corrected, and the absolute value of F-Theta distortion is less than 20%.

[0106] In this specific embodiment, the focal length f of the optical imaging lens is 2.15 mm; the aperture value FNO is 2.25; the field of view angle FOV is 120°; and the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 10 on the optical axis I is 17.00 mm.

[0107] The specific embodiment has a small temperature drift and can be used under the temperature condition of -30°C to 85°C while maintaining the picture clarity unchanged.

[0108] Embodiment 2

[0109] like Figure 7As shown, the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0110] The detailed optical data of this specific embodiment are shown in Table 2-1.

[0111] Table 2-1 Detailed optical data of Example 2

[0112]

[0113] For detailed parameter data of each aspheric surface in this specific embodiment, please refer to the following table:

[0114] surface k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 21 0.25 2.568E-02 -3.892E-03 6.438E-04 -6.873E-05 1.938E-06 1.688E-07 -1.031E-08 22 -0.74 4.315E-02 -4.430E-03 8.665E-04 -1.687E-04 -3.104E-05 9.842E-06 -6.643E-07 61 -0.42 -1.389E-03 1.121E-03 -3.754E-04 3.888E-05 2.549E-06 -5.531E-07 1.868E-08 62 0.08 4.796E-03 2.541E-04 3.720E-06 -4.627E-05 8.792E-06 -2.666E-07 -2.008E-08

[0115] Please refer to Table 6 for the numerical values ​​of the relevant conditional expressions of this specific embodiment.

[0116] The MTF transfer function curve of this specific embodiment is shown in Figure 8 , see the defocus curve for details Fig. 9 It can be seen that the resolution is high, the central MTF value of the 250lp / mm spatial frequency is greater than 0.5, and the imaging quality is excellent; please refer to the lateral chromatic aberration curve Fig.10 , longitudinal aberration see Fig.11 , it can be seen that chromatic aberration and aberration correction are good; for field curvature and distortion diagrams, please refer to Fig.12 From (A) and (B), we can see that the field curvature and distortion are well corrected, and the absolute value of F-Theta distortion is less than 5%.

[0117] In this specific embodiment, the focal length f of the optical imaging lens is 2.15 mm; the aperture value FNO is 2.25; the field of view angle FOV is 120°; and the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 10 on the optical axis I is 17.00 mm.

[0118] The specific embodiment has a small temperature drift and can be used under the temperature condition of -30°C to 85°C while maintaining the picture clarity unchanged.

[0119] Embodiment 3

[0120] like Fig.13 As shown, the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0121] The detailed optical data of this specific embodiment are shown in Table 3-1.

[0122] Table 3-1 Detailed optical data of Example 3

[0123]

[0124]

[0125] For detailed parameter data of each aspheric surface in this specific embodiment, please refer to the following table:

[0126] surface k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 21 -0.11 2.364E-02 -3.477E-03 5.925E-04 -6.770E-05 2.085E-06 1.569E-07 -9.612E-09 22 -0.78 4.078E-02 -4.016E-03 9.082E-04 -2.314E-04 -3.005E-05 1.233E-05 -9.030E-07 61 -2.37 -1.046E-03 1.047E-03 -3.344E-04 3.087E-05 2.348E-06 -4.228E-07 1.250E-08 62 -1.63 4.289E-03 2.430E-04 -1.400E-06 -4.243E-05 7.964E-06 -2.837E-07 -1.205E-08

[0127] Please refer to Table 6 for the numerical values ​​of the relevant conditional expressions of this specific embodiment.

[0128] The MTF transfer function curve of this specific embodiment is shown in Fig.14 , see the defocus curve for details Fig.15 It can be seen that the resolution is high, the central MTF value of the 250lp / mm spatial frequency is greater than 0.5, and the imaging quality is excellent; please refer to the lateral chromatic aberration curve Fig.16 , longitudinal aberration see Fig.17 , it can be seen that chromatic aberration and aberration correction are good; for field curvature and distortion diagrams, please refer to Fig.18 From (A) and (B), we can see that the field curvature and distortion are well corrected, and the absolute value of F-Theta distortion is less than 20%.

[0129] In this specific embodiment, the focal length f of the optical imaging lens is 2.15 mm; the aperture value FNO is 2.25; the field of view angle FOV is 120°; and the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 10 on the optical axis I is 17.00 mm.

[0130] The specific embodiment has a small temperature drift and can be used under the temperature condition of -30°C to 85°C while maintaining the picture clarity unchanged.

[0131] Embodiment 4

[0132] like Fig.19 As shown, the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0133] The detailed optical data of this specific embodiment are shown in Table 4-1.

[0134] Table 4-1 Detailed optical data of Example 4

[0135]

[0136]

[0137] For detailed parameter data of each aspheric surface in this specific embodiment, please refer to the following table:

[0138] surface k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 21 -0.35 2.481E-02 -3.724E-03 6.031E-04 -6.749E-05 2.374E-06 1.104E-07 -7.191E-09 22 -0.75 4.195E-02 -4.915E-03 1.045E-03 -2.430E-04 -3.460E-05 1.454E-05 -1.113E-06 61 -2.73 -1.006E-03 1.006E-03 -3.065E-04 2.920E-05 1.988E-06 -3.969E-07 1.512E-08 62 -1.60 4.425E-03 2.536E-04 -1.545E-05 -3.597E-05 7.710E-06 -4.340E-07 3.861E-09

[0139] Please refer to Table 6 for the numerical values ​​of the relevant conditional expressions of this specific embodiment.

[0140] The MTF transfer function curve of this specific embodiment is shown in Fig. 20 , see the defocus curve for details Fig.21 It can be seen that the resolution is high, the central MTF value of the 250lp / mm spatial frequency is greater than 0.5, and the imaging quality is excellent; please refer to the lateral chromatic aberration curve Fig. 22 , longitudinal aberration see Fig.23 , it can be seen that chromatic aberration and aberration correction are good; for field curvature and distortion diagrams, please refer to Fig.24 From (A) and (B), we can see that the field curvature and distortion are well corrected, and the absolute value of F-Theta distortion is less than 20%.

[0141] In this specific embodiment, the focal length f of the optical imaging lens is 2.15 mm; the aperture value FNO is 2.25; the field of view angle FOV is 120°; and the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 10 on the optical axis I is 17.00 mm.

[0142] The specific embodiment has a small temperature drift and can be used under the temperature condition of -30°C to 85°C while maintaining the picture clarity unchanged.

[0143] Embodiment 5

[0144] like Fig.25 As shown, the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0145] The detailed optical data of this specific embodiment are shown in Table 5-1.

[0146] Table 5-1 Detailed optical data of Example 5

[0147]

[0148]

[0149] For detailed parameter data of each aspheric surface in this specific embodiment, please refer to the following table:

[0150] surface k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 21 0.25 2.428E-02 -3.534E-03 5.880E-04 -6.981E-05 2.461E-06 1.621E-07 -1.162E-08 22 -0.82 3.940E-02 -1.358E-03 1.333E-04 -1.530E-04 -1.916E-05 9.371E-06 -7.549E-07 61 0.74 -1.276E-03 1.095E-03 -3.290E-04 3.451E-05 1.862E-06 -4.491E-07 1.625E-08 62 -8.46 4.361E-03 3.189E-04 1.962E-05 -4.996E-05 9.709E-06 -4.190E-07 -1.105E-08

[0151] Please refer to Table 6 for the numerical values ​​of the relevant conditional expressions of this specific embodiment.

[0152] The MTF transfer function curve of this specific embodiment is shown in Fig.26 , see the defocus curve for details Fig. 27It can be seen that the resolution is high, the central MTF value of the 250lp / mm spatial frequency is greater than 0.5, and the imaging quality is excellent; please refer to the lateral chromatic aberration curve Fig.28 , longitudinal aberration see Fig.29 , it can be seen that chromatic aberration and aberration correction are good; for field curvature and distortion diagrams, please refer to Fig.30 From (A) and (B), we can see that the field curvature and distortion are well corrected, and the absolute value of F-Theta distortion is less than 20%.

[0153] In this specific embodiment, the focal length f of the optical imaging lens is 2.15 mm; the aperture value FNO is 2.25; the field of view angle FOV is 120°; and the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 10 on the optical axis I is 17.00 mm.

[0154] The specific embodiment has a small temperature drift and can be used under the temperature condition of -30°C to 85°C while maintaining the picture clarity unchanged.

[0155] Table 6 Numerical values ​​of relevant important parameters of five embodiments of the present invention

[0156]

[0157]

[0158] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A wide-angle, low-distortion optical imaging lens, characterized in that: It sequentially includes a first lens to a sixth lens 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 and allowing imaging light to pass through and an image side facing the image side and allowing imaging light to pass through; The first lens has a negative refractive power, the object side of the first lens is convex, and the image side of the first lens is concave; The second lens has a negative refractive power, the object side of the second lens is convex, and the image side of the second lens is concave; The third lens has a positive refractive power, the object side of the third lens is convex, and the image side of the third lens is convex; The fourth lens has a positive refractive power, the object side of the fourth lens is flat, and the image side of the fourth lens is convex; The fifth lens has a negative refractive power, the object side of the fifth lens is concave, and the image side of the fifth lens is convex; The sixth lens has a positive refractive power, the object side of the sixth lens is convex, and the image side of the sixth lens is convex; Both the object side and the image side of the second lens and the sixth lens are aspherical surfaces; the second lens and the sixth lens are made of plastic materials, the first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are glued to each other; The optical imaging lens has only the above-mentioned first lens to the sixth lens with refractive powers; The optical imaging lens satisfies: -6 mm < f1 < -5 mm, -7 mm < f2 < -5 mm, 4 mm < f3 < 5 mm, 3 mm < f4 < 4 mm, -5 mm < f5 < -3 mm, 7 mm < f6 < 9 mm, 10 mm < R11 < 15 mm, 2 mm < R12 < 5 mm, 4 mm < R21 < 6 mm, 2 mm < R22 < 4 mm, 6 mm < R31 < 8 mm, -8 mm < R32 < -6 mm, -3 mm < R42 < -1 mm, -3 mm < R51 < -1 mm, -7 mm < R52 < -5 mm, 7 mm < R61 < 9 mm, -8 mm < R62 < -5 mm, where f1, f2, f3, f4, f5 and 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, R11 and R12 are the curvature radii of the object side and the image side of the first lens respectively, R21 and R22 are the curvature radii of the object side and the image side of the second lens respectively, R31 and R32 are the curvature radii of the object side and the image side of the third lens respectively, R42 is the curvature radius of the image side of the fourth lens, R51 and R52 are the curvature radii of the object side and the image side of the fifth lens respectively, and R61 and R62 are the curvature radii of the object side and the image side of the sixth lens respectively.

2. The wide-angle, low-distortion optical imaging lens according to claim 1, characterized in that: The optical imaging lens further satisfies: 2 < |f1 / f| < 4, 2 < |f2 / f| < 4, 1 < |f3 / f| < 3, 1 < |f4 / f| < 3, 1 < |f5 / f| < 3, 2 < |f6 / f| < 4, 6 < |f45 / f| < 9, where f is the focal length of the optical imaging lens and f45 is the combined focal length of the fourth lens and the fifth lens.

3. The wide-angle, low-distortion optical imaging lens according to claim 1, characterized in that: The optical imaging lens further satisfies: vd4 - vd5 > 30, where vd4 is the dispersion coefficient of the fourth lens and vd5 is the dispersion coefficient of the fifth lens.

4. The wide-angle, low-distortion optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: 1.7 < nd1 < 1.9, 1.8 < nd3 < 2.0, 1.8 < nd5 < 2.0, where nd1, nd3, and nd5 are the refractive indices of the first lens, the third lens, and the fifth lens, respectively.

5. The wide-angle low-distortion optical imaging lens according to claim 4, characterized in that: The optical imaging lens further satisfies: 40 < vd1 < 50, 1.5 < nd2 < 1.7, 20 < vd2 < 30, 30 < vd3 < 40, 1.7 < nd4 < 1.8, 45 < vd4 < 55, 17 < vd5 < 20, 1.5 < nd6 < 1.7, 50 < vd6 < 60, where nd2, nd4, and nd6 are the refractive indices of the second lens, the fourth lens, and the sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and 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.

6. The wide-angle low-distortion optical imaging lens according to claim 1, characterized in that: The optical imaging lens further satisfies: 1.3 mm < SAG21 < 1.8 mm, 1.6 mm < SAG22 < 2 mm, where SAG21 and SAG22 are the sag heights of the object side and the image side of the second lens, respectively.

7. The wide-angle, low-distortion optical imaging lens according to claim 1, wherein: The object side and the image side of the second lens and the sixth lens are both 16th-order even aspheres.

8. The wide-angle, low-distortion optical imaging lens according to claim 1, wherein: It further includes a diaphragm, and the diaphragm is disposed between the third lens and the fourth lens.

Images