An optical imaging lens

Abstract

This invention relates to the field of lens technology. The invention discloses an optical imaging lens comprising seven lenses; the first and sixth lenses both have negative refractive indices, and their object-side and image-side surfaces are convex and concave near the optical axis, respectively; the second lens has positive refractive indices, and its image-side surface is convex near the optical axis; the third and fifth lenses both have positive refractive indices, and their object-side and image-side surfaces are concave and convex near the optical axis, respectively; the fourth lens is a positive convex-convex lens; the seventh lens has positive refractive indices; its object-side and image-side surfaces are both convex near the optical axis; the fourth lens is made of glass, while the first, second, third, fifth, sixth, and seventh lenses are all plastic aspherical lenses. This invention has the advantages of a shorter overall lens length, smaller size, lower cost, larger light transmission, lower distortion, better image quality, and lower temperature drift.

Description

Technical Field

[0001] This invention belongs to the field of lens technology, and specifically relates to an optical imaging lens. Background Technology

[0002] With the continuous advancement of technology and the continuous development of living standards, optical imaging lenses have also developed rapidly in recent years. Optical imaging lenses are widely used in various fields such as smartphones, tablets, vehicle monitoring, security monitoring, drone aerial photography, machine vision systems, and video conferencing. Therefore, the requirements for optical imaging lenses are also getting higher and higher.

[0003] However, current optical imaging lenses still have many shortcomings, such as excessive total optical length (TTL), requiring the use of multiple glass or cemented lenses to correct chromatic aberration, resulting in high overall cost and large size; large temperature drift, affecting image quality when temperature fluctuations are too large; excessive distortion, leading to poor edge image quality and increased post-processing difficulty; and low light transmission, resulting in insufficient light intake and unclear images. Therefore, it is necessary to improve these lenses to meet the increasingly demanding requirements of consumers. Summary of the Invention

[0004] The purpose of this invention is to provide an optical imaging lens to solve the aforementioned technical problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an optical imaging lens, comprising, from the object side to the image side along an optical axis, a first lens to a seventh lens; each of the first to seventh lenses includes 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; the first lens has a negative refractive index, the object-side surface of the first lens is convex near the optical axis, and the image-side surface of the first lens is concave near the optical axis; the second lens has a positive refractive index, the image-side surface of the second lens is convex near the optical axis; the third lens has a positive refractive index, the object-side surface of the third lens is concave near the optical axis, and the image-side surface of the third lens is convex near the optical axis; the fourth lens has a positive refractive index, and the fourth lens... The object-side surface of the fourth lens is convex, and the image-side surface of the fifth lens is also convex. The fifth lens has positive refractive index; its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. The sixth lens has negative refractive index; its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. The seventh lens has positive refractive index; its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. The fourth lens is made of glass, while the first, second, third, fifth, sixth, and seventh lenses are all aspherical plastic lenses. The only lenses with refractive index in this optical imaging lens are the first to seventh lenses mentioned above.

[0006] Further, the optical imaging lens further satisfies: -7.00mm < f1 < -5.00mm, 50.00mm < f2 ≤ 70.00mm, 20.00mm < f3 < 30.00mm, 5.00mm < f4 < 15.00mm, 8.00mm < f5 < 11.00mm, -6.00mm < f6 < -4.00mm, 5.00mm < f7 < 6.5.00mm, where f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens, respectively.

[0007] Further, the optical imaging lens further satisfies: 1.00 < |f1 / f| < 2.00, 10.00 < |f2 / f| < 20.00, 4.00 < |f3 / f| < 8.00, 1.00 < |f4 / f| < 4.00, 2.00 < |f5 / f| < 3.00, 1.00 < |f6 / f| < 2.00, 1.00 < |f7 / f| < 2.00, where f is the overall 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 f7 is the focal length of the seventh lens.

[0008] Further, the optical imaging lens further satisfies: 1.50 < nd1 < 1.60, 50.00 < vd1 < 60.00, 1.60 < nd2 < 1.70, 18.00 < vd2 < 26.00, 1.50 < nd3 < 1.70, 50.00 < vd3 < 70.00, 1.45 < nd4 < 1.70, 50.00 < vd4 < 70.00, 1.50 < nd5 < 1.70, 50.00 < vd5 < 60.00, 1.60 < nd6 < 1.70, 18.00 < vd6 < 26.00, 1.50 < nd7 < 1.60, 50.00 < vd7 < 60.00, where nd1 - nd7 are the refractive indices of the first lens to the seventh lens, and vd1 - vd7 are the dispersion coefficients of the first lens to the seventh lens.

[0009] Further, it further includes an aperture, and the aperture is disposed between the third lens and the fourth lens.

[0010] Even further, the optical imaging lens further satisfies: 2.00 < (f 前 / f 后 ) < 3.00, where f 前 is the combined focal length of the first lens, the second lens, and the third lens, and f 后 is the combined focal length of the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0011] Further, the optical imaging lens further satisfies: 4.00 < f67 / f < 5.60; where f67 is the combined focal length of the sixth lens and the seventh lens, and f is the overall focal length of the optical imaging lens.

[0012] Further, the optical imaging lens further satisfies: 1.00 < SD2 / SAG2 < 1.50; where SD2 is the effective aperture of the image side of the first lens, and SAG1 is the sagitta of the image side of the first lens.

[0013] Further, the optical imaging lens further satisfies: 7.00 ≤ TTL / AAG, where TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, and AAG is the sum of the air gaps on the optical axis from the first lens to the seventh lens.

[0014] Further, the optical imaging lens further satisfies: 1.00 < IMH / f < 1.50, where IMH is the semi-image height on the image side of the optical imaging lens, and f is the overall focal length of the optical imaging lens.

[0015] Advantageous technical effects of the present invention:

[0016] The present invention adopts a design combining one glass lens and six plastic aspherical lenses. Through corresponding designs for each lens, it has the advantages of a shorter overall length of the lens, small volume, low cost; large light transmission, uniform imaging at the center and edges, without forming a dark corner; small distortion, good imaging quality, greatly reducing the difficulty of post-correction; small temperature drift, and good imaging quality at high and low temperatures. Description of the drawings

[0017] 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 drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0019] Figure 2 It is a MTF graph of Embodiment 1 of the present invention at visible light of 435 - 650 nm;

[0020] Figure 3 It is a defocus curve graph of 60 lp / mm of Embodiment 1 of the present invention at visible light of 435 - 650 nm;

[0021] Figure 4 It is a lateral chromatic aberration curve graph of Embodiment 1 of the present invention at visible light of 435 nm - 650 nm;

[0022] Figure 5 This is a longitudinal color difference curve of Embodiment 1 of the present invention in the visible light range of 435nm-650nm;

[0023] Figure 6 This is a field curvature and distortion curve of Embodiment 1 of the present invention in the visible light range of 435nm-650nm;

[0024] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0025] Figure 8 This is the MTF diagram of Embodiment 2 of the present invention under visible light 435-650nm;

[0026] Figure 9 This is a defocus curve of 60 lp / mm in visible light 435-650 nm according to Embodiment 2 of the present invention;

[0027] Figure 10 This is a lateral color difference curve of Embodiment 2 of the present invention in the visible light range of 435nm-650nm;

[0028] Figure 11 This is a longitudinal color difference curve of Embodiment 2 of the present invention in the visible light range of 435nm-650nm;

[0029] Figure 12 This is a field curvature and distortion curve of Embodiment 2 of the present invention in the visible light range of 435nm-650nm;

[0030] Figure 13 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0031] Figure 14 This is the MTF diagram of Embodiment 3 of the present invention under visible light 435-650nm;

[0032] Figure 15 This is a defocus curve of 60 lp / mm in visible light 435-650 nm according to Embodiment 3 of the present invention;

[0033] Figure 16 This is a lateral color difference curve of Embodiment 3 of the present invention in the visible light range of 435nm-650nm;

[0034] Figure 17 This is a longitudinal color difference curve of Embodiment 3 of the present invention in the visible light range of 435nm-650nm;

[0035] Figure 18 This is a field curvature and distortion curve of Embodiment 3 of the present invention in the visible light range of 435nm-650nm;

[0036] Figure 19 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0037] Figure 20 This is the MTF diagram of Embodiment 4 of the present invention under visible light 435-650nm;

[0038] Figure 21 This is a defocus curve of 60 lp / mm in visible light 435-650 nm according to Embodiment 4 of the present invention;

[0039] Figure 22 This is a lateral color difference curve of Embodiment 4 of the present invention in the visible light range of 435nm-650nm;

[0040] Figure 23 This is a longitudinal color difference curve of Embodiment 4 of the present invention in the visible light range of 435nm-650nm;

[0041] Figure 24 This is a field curvature and distortion curve diagram of Embodiment 4 of the present invention under visible light 435nm-650nm. Detailed Implementation

[0042] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0043] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0044] The phrase "a lens has a positive (or negative) refractive index" refers to the lens having a positive (or negative) paraxial refractive index calculated using Gaussian optics theory. The "object-side surface (or image-side surface)" is defined as the specific area through which imaging rays pass on the lens surface. The convexity or concavity of a lens surface can be determined using methods commonly employed in the field, namely by the sign of the radius of curvature (R-value). R-values ​​are commonly used in optical design software such as Zemax or CodeV. R-values ​​are also frequently found in lens data sheets within optical design software. For the object-side surface, a positive R-value indicates a convex surface, while a negative R-value indicates a concave surface. Conversely, for the image-side surface, a positive R-value indicates a concave surface, while a negative R-value indicates a convex surface.

[0045] The present invention discloses an optical imaging lens, which sequentially includes a first lens to a seventh lens along an optical axis from the object side to the image side; each of the first lens to the seventh 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 near the optical axis, and the image side of the first lens is concave near the optical axis; the second lens has a positive refractive power, and the image side of the second lens is convex near the optical axis; the third lens has a positive refractive power, the object side of the third lens is concave near the optical axis, and the image side of the third lens is convex near the optical axis; the fourth lens has a positive refractive power, the object side of the fourth lens is convex, and the image side of the fourth lens is convex; the fifth lens has a positive refractive power, the object side of the fifth lens is concave near the optical axis, and the image side of the fifth lens is convex near the optical axis; the sixth lens has a negative refractive power, the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is concave near the optical axis; the seventh lens has a positive refractive power; the object side of the seventh lens is convex near the optical axis, and the image side of the seventh lens is convex near the optical axis; the fourth lens is made of glass material, and the first lens, the second lens, the third lens, the fifth lens and the sixth lens are all plastic aspherical lenses; the only lenses with refractive power in this optical imaging lens are the above-mentioned first lens to the seventh lens.

[0046] The present invention adopts a design combining one glass lens and six plastic aspherical lenses, and through corresponding designs for each lens, it has the advantages of a shorter overall length of the lens, a small volume, and a low cost; a large clear aperture, uniform imaging at the center and edges, and no vignetting; small distortion, good imaging quality, and greatly reducing the difficulty of post-correction; small temperature drift, and good imaging quality within the temperature range of -40°C to 80°C.

[0047] Preferably, this optical imaging lens further satisfies: -7.00mm < f1 < -5.00mm, 50.00mm < f2 ≤ 70.00mm, 20.00mm < f3 < 30.00mm, 5.00mm < f4 < 15.00mm, 8.00mm < f5 < 11.00mm, -6.00mm < f6 < -4.00mm, 5.00mm < f7 < 6.5.00mm, where f1, f2, f3, f4, f5, f6, f7 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens respectively, so that the optical power distribution of the lenses is uniform and reasonable, and further improves the imaging quality.

[0048] Preferably, the optical imaging lens further satisfies: 1.00 < |f1 / f| < 2.00, 10.00 < |f2 / f| < 20.00, 4.00 < |f3 / f| < 8.00, 1.00 < |f4 / f| < 4.00, 2.00 < |f5 / f| < 3.00, 1.00 < |f6 / f| < 2.00, 1.00 < |f7 / f| < 2.00, where f is the overall 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 f7 is the focal length of the seventh lens, so that the distribution of the optical power of the lens is uniform and reasonable, further improving the imaging quality.

[0049] Preferably, the optical imaging lens further satisfies: 1.50 < nd1 < 1.60, 50.00 < vd1 < 60.00, 1.60 < nd2 < 1.70, 18.00 < vd2 < 26.00, 1.50 < nd3 < 1.70, 50.00 < vd3 < 70.00, 1.45 < nd4 < 1.70, 50.00 < vd4 < 70.00, 1.50 < nd5 < 1.70, 50.00 < vd5 < 60.00, 1.60 < nd6 < 1.70, 18.00 < vd6 < 26.00, 1.50 < nd7 < 1.60, 50.00 < vd7 < 60.00, where nd1 - nd7 are the refractive indices of the first lens to the seventh lens respectively, and vd1 - vd7 are the dispersion coefficients of the first lens to the seventh lens respectively, further optimizing chromatic aberration and spherical aberration and improving the imaging quality.

[0050] Preferably, it further includes an aperture, and the aperture is arranged between the third lens and the fourth lens to further improve the overall performance.

[0051] More preferably, the optical imaging lens further satisfies: 2.00 < (f 前 / f 后 ) < 3.00, where f 前 is the combined focal length of the first lens, the second lens and the third lens, and f 后 is the combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens. Controlling the ratio of the front and rear group focal lengths can better distribute the optical power between the front and rear groups, reduce system aberration, and improve the imaging quality.

[0052] Preferably, the optical imaging lens further satisfies: 4.00 < f67 / f < 5.60; where f67 is the combined focal length of the sixth lens and the seventh lens, and f is the overall focal length of the optical imaging lens, which can better distribute the optical power of the lens and is more conducive to the chromatic aberration correction of the system.

[0053] Preferably, the optical imaging lens further satisfies: 1.00 < SD2 / SAG2 < 1.50; where SD2 is the effective aperture of the image side of the first lens, and SAG1 is the sagitta of the image side of the first lens, which can better control the distortion of the lens and keep the lens with low distortion.

[0054] Preferably, the optical imaging lens further satisfies: 7.00 ≤ TTL / AAG, where TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and AAG is the sum of the air gaps of the first lens to the seventh lens on the optical axis.

[0055] Preferably, the optical imaging lens further satisfies: 1.00 < IMH / f < 1.50, where IMH is the semi-image height on the image side of the optical imaging lens, and f is the overall focal length of the optical imaging lens.

[0056] Hereinafter, the optical imaging lens of the present invention will be described in detail with specific embodiments.

[0057] Embodiment 1

[0058] As Figure 1 shown, an optical imaging lens sequentially includes a first lens 1, a second lens 2, a third lens 3, an aperture 8, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a protective glass 9, and an imaging plane 100 along the optical axis I from the object side A1 to the image side A2; each of the first lens 1 to the seventh lens 7 includes an object side facing the object side A1 and allowing imaging light to pass through and an image side facing the image side A2 and allowing imaging light to pass through.

[0059] The first lens 1 has a negative refractive power. The object side 11 of the first lens 1 is convex near the optical axis, and the image side 12 of the first lens 1 is concave near the optical axis. More specifically, the object side 11 of the first lens 1 is convex, and the image side 12 of the first lens 1 is concave.

[0060] The second lens 2 has a positive refractive power. The object side 21 of the second lens 2 is convex near the optical axis, and the image side 22 of the second lens 2 is convex near the optical axis. More specifically, the image side 22 of the second lens 2 is convex.

[0061] The third lens 3 has a positive refractive power. The object side 31 of the third lens 3 is concave near the optical axis, and the image side 32 of the third lens 3 is convex near the optical axis. More specifically, the image side 32 of the third lens 3 is convex.

[0062] The fourth lens 4 has a positive refractive power. The object side 41 of the fourth lens 4 is convex, and the image side 42 of the fourth lens 4 is convex.

[0063] The fifth lens 5 has a positive refractive index. The object-side surface 51 of the fifth lens 5 is concave near the optical axis, and the image-side surface 52 of the fifth lens 5 is convex near the optical axis. More specifically, the object-side surface 51 of the fifth lens 5 is concave, and the image-side surface 52 of the fifth lens 5 is convex.

[0064] The sixth lens 6 has a negative refractive index. The object side 61 of the sixth lens 6 is convex near the optical axis, and the image side 62 of the sixth lens 6 is concave near the optical axis. More specifically, the image side 62 of the sixth lens 6 is concave.

[0065] The seventh lens 7 has a positive refractive index; the object-side surface 71 of the seventh lens 7 is convex near the optical axis, and the image-side surface 72 of the seventh lens 7 is convex near the optical axis. More specifically, the object-side surface 71 of the seventh lens 7 is convex, and the image-side surface 72 of the seventh lens 7 is convex.

[0066] The fourth lens 4 is made of glass, while the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, the sixth lens 7, and the seventh lens 7 are all plastic aspherical lenses.

[0067] In this specific embodiment, the aperture stop 8 is disposed between the third lens 3 and the fourth lens 4, but it is not limited thereto. In other embodiments, the aperture stop 8 may also be disposed in other suitable positions.

[0068] Detailed optical data for this specific embodiment are shown in Table 1-1.

[0069] Table 1-1 Detailed optical data for Example 1

[0070]

[0071]

[0072] In this specific embodiment, the object side surface 11, object side surface 21, object side surface 31, object side surface 51, object side surface 61, object side surface 71, image side surface 12, image side surface 22, image side surface 32, image side surface 52, image side surface 62, and image side surface 72 are defined according to the following aspherical curve formula:

[0073]

[0074] in:

[0075] r is the distance from a point on the optical surface to the optical axis.

[0076] z is the sag of the point along the optical axis.

[0077] c is the curvature of the surface.

[0078] K is the quadratic surface constant of the surface.

[0079] A4, A6, A8, A 10 A 12 A 14 A 16 These are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively.

[0080] Please refer to the table below for detailed parameter data for each aspherical surface:

[0081] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 11 -4.86 -3.605E-04 2.434E-05 -2.787E-06 1.858E-07 -7.849E-09 1.872E-10 -1.799E-12 12 -0.58 -6.678E-03 1.092E-03 -7.375E-04 2.463E-04 -4.852E-05 4.878E-06 -2.150E-07 21 -22.29 -2.223E-03 4.068E-04 -1.249E-04 1.129E-05 7.972E-07 -4.024E-07 3.076E-08 22 97.73 -6.911E-03 3.519E-04 8.829E-04 -5.774E-04 1.518E-04 -1.835E-05 8.463E-07 31 64.08 7.079E-04 9.091E-04 1.127E-03 -7.814E-04 2.122E-04 -2.606E-05 1.210E-06 32 -9.27 6.347E-03 1.875E-04 3.095E-04 -1.703E-04 3.381E-05 -1.568E-07 -4.857E-07 51 -11.07 1.483E-02 -2.094E-03 2.723E-04 -4.138E-05 6.205E-06 -6.744E-07 3.259E-08 52 -7.94 -2.835E-03 1.182E-03 -4.748E-04 7.973E-05 -7.875E-06 3.160E-07 3.459E-09 61 -98.73 -1.814E-02 1.067E-03 -1.208E-04 3.467E-05 -6.061E-06 2.502E-07 1.362E-08 62 -7.05 -5.748E-03 7.244E-04 6.395E-06 -1.424E-05 1.908E-06 -1.207E-07 3.173E-09 71 -16.18 1.206E-03 7.232E-04 -2.356E-04 3.272E-05 -2.623E-06 1.090E-07 -1.739E-09 72 -5.08 -6.347E-03 8.987E-04 -1.130E-04 1.068E-05 -6.731E-07 2.325E-08 -3.186E-10

[0082] Please refer to Table 5 for the numerical values ​​of the relevant conditional expressions in this specific embodiment.

[0083] For details of the MTF curve in this specific embodiment, please refer to [link / reference]. Figure 2 As can be seen, the resolution is greater than 0.4 across the entire field of view at 125 lp / mm, indicating high resolution. Please refer to the defocus curve diagram. Figure 3 For details on the lateral color difference chart, please refer to [link / reference]. Figure 4 For details of the longitudinal color difference diagram, please refer to [link / reference]. Figure 5 As can be seen, chromatic aberration and aberration are well corrected, resulting in good image quality; for field curvature and distortion diagrams, please refer to [link to diagram]. Figure 6 From (A) and (B), it can be seen that the field curvature and distortion are well corrected, and the optical distortion is ≤10%.

[0084] In this specific embodiment, the focal length of the optical imaging lens is f = 4.109 mm; the field of view (FOV) is 100.0°; the aperture value (FNO) is 2.0; the image half-height (IMH) is 4.406 mm; and the distance (TTL) between the object side 11 of the first lens 1 and the imaging surface 100 on the optical axis I is 25.413 mm.

[0085] This embodiment exhibits good imaging performance within a temperature range of -40℃ to 80℃.

[0086] Example 2

[0087] like Figure 7 As shown, the surface concavity and convexity and refractive index of each lens in this embodiment are roughly the same as those in Embodiment 1. Only the object side 21 of the second lens 2 is concave near the optical axis. In addition, the optical parameters such as the radius of curvature and lens thickness of each lens surface are also different.

[0088] Detailed optical data for this specific embodiment are shown in Table 2-1.

[0089] Table 2-1 Detailed optical data for Example 2

[0090] surface Diameter / mm radius of curvature / mm Thickness / Gap / mm Material Refractive index Dispersion coefficient Focal length / mm - Infinity Infinity 11 First lens 11.006 6.920 2.320 K26R 1.54 55.71 -5.957 12 5.730 1.932 2.655 21 Second lens 5.543 -243.473 2.711 EP8000 1.67 20.38 69.990 22 4.794 -39.351 0.106 31 Third lens 4.582 -20.206 1.368 K26R 1.54 55.71 23.503 32 3.963 -7.955 0.311 8 aperture 3.602 Infinity -0.163 41 Fourth lens 10.400 9.873 3.363 H-BAK7 1.57 56.04 10.678 42 10.400 -13.951 0.122 51 Fifth lens 5.334 -7.235 1.668 K26R 1.54 55.71 9.215 52 5.575 -3.176 0.087 61 Sixth lens 5.461 15.367 1.262 EP5000 1.64 23.97 -4.830 62 6.629 2.492 0.311 71 Seventh Lens 6.742 6.948 3.736 K26R 1.54 55.71 5.520 72 7.746 -4.202 4.315 9 Protective glass 8.827 Infinity 0.800 H-K9L 1.52 64.20 Infinity - 8.926 Infinity 0.144 100 Imaging surface 8.853 Infinity

[0091] Please refer to the table below for detailed parameter data of each aspherical surface in this specific embodiment:

[0092]

[0093]

[0094] Please refer to Table 5 for the numerical values ​​of the relevant conditional expressions in this specific embodiment.

[0095] For details of the MTF curve in this specific embodiment, please refer to [link / reference]. Figure 8 As can be seen, the resolution is greater than 0.35 across the entire field of view at 125 lp / mm, indicating high resolution. Please refer to the defocus curve diagram. Figure 9 For details on the lateral color difference chart, please refer to [link / reference]. Figure 10 For details of the longitudinal color difference diagram, please refer to [link / reference]. Figure 11 As can be seen, chromatic aberration and aberration are well corrected, resulting in good image quality; for field curvature and distortion diagrams, please refer to [link to diagram]. Figure 6 From (A) and (B), it can be seen that the field curvature and distortion are well corrected, and the optical distortion is ≤10%.

[0096] In this specific embodiment, the focal length of the optical imaging lens is f = 4.091 mm; the field of view (FOV) is 100.0°; the aperture value (FNO) is 1.95; the image half-height (IMH) is 4.406 mm; and the distance (TTL) between the object side 11 of the first lens 1 and the imaging surface 100 on the optical axis I is 25.115 mm.

[0097] This embodiment exhibits good imaging performance within a temperature range of -40℃ to 80℃.

[0098] Example 3

[0099] like Figure 13 As shown, the surface concavity and convexity of each lens in this embodiment are the same as those in Embodiment 1, and the only difference is the optical parameters such as the radius of curvature and lens thickness of each lens surface.

[0100] Detailed optical data for this specific embodiment are shown in Table 3-1.

[0101] Table 3-1 Detailed optical data for Example 3

[0102]

[0103]

[0104] Please refer to the table below for detailed parameter data of each aspherical surface in this specific embodiment:

[0105] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 11 -4.67 -3.605E-04 2.434E-05 -2.787E-06 1.858E-07 -7.849E-09 1.872E-10 -1.799E-12 12 -0.57 -6.678E-03 1.092E-03 -7.375E-04 2.463E-04 -4.852E-05 4.878E-06 -2.150E-07 21 0.00 -2.030E-03 2.273E-04 -6.441E-05 4.612E-06 1.731E-07 -1.701E-07 1.612E-08 22 182.53 -7.395E-03 6.016E-04 7.814E-04 -5.488E-04 1.483E-04 -1.824E-05 8.528E-07 31 62.69 7.079E-04 9.091E-04 1.127E-03 -7.814E-04 2.122E-04 -2.606E-05 1.210E-06 32 -12.25 6.347E-03 1.875E-04 3.095E-04 -1.703E-04 3.381E-05 -1.568E-07 -4.857E-07 51 -11.16 1.483E-02 -2.094E-03 2.723E-04 -4.138E-05 6.205E-06 -6.744E-07 3.259E-08 52 -7.82 -2.835E-03 1.182E-03 -4.748E-04 7.973E-05 -7.875E-06 3.160E-07 3.459E-09 61 -101.68 -1.814E-02 1.067E-03 -1.208E-04 3.467E-05 -6.061E-06 2.502E-07 1.362E-08 62 -6.99 -5.748E-03 7.244E-04 6.395E-06 -1.424E-05 1.908E-06 -1.207E-07 3.173E-09 71 -16.17 1.206E-03 7.232E-04 -2.356E-04 3.272E-05 -2.623E-06 1.090E-07 -1.739E-09 72 -5.05 -6.347E-03 8.987E-04 -1.130E-04 1.068E-05 -6.731E-07 2.325E-08 -3.186E-10

[0106] Please refer to Table 5 for the numerical values ​​of the relevant conditional expressions in this specific embodiment.

[0107] For details of the MTF curve in this specific embodiment, please refer to [link / reference]. Figure 14 As can be seen, the resolution is greater than 0.35 across the entire field of view at 125 lp / mm, indicating high resolution. Please refer to the defocus curve diagram. Figure 15 For details on the lateral color difference chart, please refer to [link / reference]. Figure 16 For details of the longitudinal color difference diagram, please refer to [link / reference]. Figure 17 As can be seen, chromatic aberration and aberration are well corrected, resulting in good image quality; for field curvature and distortion diagrams, please refer to [link to diagram]. Figure 18 From (A) and (B), it can be seen that the field curvature and distortion are well corrected, and the optical distortion is ≤10%.

[0108] In this specific embodiment, the focal length of the optical imaging lens is f = 4.107 mm; the field of view (FOV) is 100.0°; the aperture value (FNO) is 2.0; the image half height (IMH) is 4.406 mm; and the distance (TTL) between the object side surface 11 of the first lens 1 and the imaging surface 100 on the optical axis I is 25.124 mm.

[0109] This embodiment exhibits good imaging performance within a temperature range of -40℃ to 80℃.

[0110] Example 4

[0111] like Figure 19 As shown, the surface concavity and convexity of each lens in this embodiment are the same as those in Embodiment 1, and the only difference is the optical parameters such as the radius of curvature and lens thickness of each lens surface.

[0112] Detailed optical data for this specific embodiment are shown in Table 4-1.

[0113] Table 4-1 Detailed optical data for Example 4

[0114]

[0115]

[0116] Please refer to the table below for detailed parameter data of each aspherical surface in this specific embodiment:

[0117] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 11 -4.58 -3.179E-04 2.584E-05 -2.777E-06 1.847E-07 -7.910E-09 1.861E-10 -1.731E-12 12 -0.58 -5.800E-03 1.124E-03 -7.335E-04 2.474E-04 -4.841E-05 4.878E-06 -2.170E-07 21 2951.32 -2.222E-03 3.868E-04 -1.253E-04 1.061E-05 8.451E-07 -3.816E-07 2.754E-08 22 12.83 -7.093E-03 4.508E-04 8.711E-04 -5.755E-04 1.518E-04 -1.847E-05 8.612E-07 31 58.79 6.400E-04 1.087E-03 1.141E-03 -7.824E-04 2.117E-04 -2.608E-05 1.215E-06 32 -7.86 6.248E-03 3.058E-04 3.273E-04 -1.726E-04 3.319E-05 -3.613E-08 -4.517E-07 51 -8.54 1.522E-02 -2.070E-03 2.711E-04 -4.092E-05 6.240E-06 -6.904E-07 3.334E-08 52 -8.49 -1.081E-03 8.698E-04 -3.861E-04 6.822E-05 -8.337E-06 5.126E-07 -7.843E-09 61 -47.66 -1.712E-02 1.089E-03 -1.262E-04 3.300E-05 -6.210E-06 2.583E-07 1.405E-08 62 -6.93 -4.905E-03 5.065E-04 3.736E-05 -1.764E-05 2.038E-06 -1.179E-07 2.908E-09 71 -14.31 1.409E-03 7.328E-04 -2.366E-04 3.254E-05 -2.620E-06 1.105E-07 -1.771E-09 72 -5.47 -6.373E-03 9.471E-04 -1.148E-04 1.057E-05 -6.342E-07 2.029E-08 -2.059E-10

[0118] Please refer to Table 5 for the numerical values ​​of the relevant conditional expressions in this specific embodiment.

[0119] For details of the MTF curve in this specific embodiment, please refer to [link / reference]. Figure 20 As can be seen, the resolution is greater than 0.35 across the entire field of view at 125 lp / mm, indicating high resolution. Please refer to the defocus curve diagram. Figure 21 For details on the lateral color difference chart, please refer to [link / reference]. Figure 22 For details of the longitudinal color difference diagram, please refer to [link / reference]. Figure 23 As can be seen, chromatic aberration and aberration are well corrected, resulting in good image quality; for field curvature and distortion diagrams, please refer to [link to diagram]. Figure 24From (A) and (B), it can be seen that the field curvature and distortion are well corrected, and the optical distortion is ≤10%.

[0120] In this specific embodiment, the focal length of the optical imaging lens is f = 4.106 mm; the field of view (FOV) is 100.0°; the aperture value (FNO) is 1.97; the image half height (IMH) is 4.406 mm; and the distance (TTL) between the object side surface 11 of the first lens 1 and the imaging surface 100 on the optical axis I is 24.732 mm.

[0121] This embodiment exhibits good imaging performance within a temperature range of -40℃ to 80℃.

[0122] Table 5. Values ​​of relevant important parameters in four embodiments of the present invention.

[0123] Example 1 Example 2 Example 3 Example 4 IMH / f 1.07 1.08 1.07 1.07 <![CDATA[f 前 / f 后 ]]> 2.158 2.122 2.023 2.309 f67 / f 4.67 5.52 4.87 5.58 TTL / AAG 7.43 7.32 7.46 7.103 SD2 / SAG2 2.463 2.392 2.501 2.395

[0124] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. An optical imaging lens, which sequentially includes a first lens to a seventh lens along an optical axis from the object side to the image side; each of the first lens to the seventh 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; characterized in that: The first lens has a negative refractive power, the object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis; The second lens has a positive refractive power, and the image side of the second lens is convex near the optical axis; The third lens has a positive refractive power, the object side of the third lens is concave near the optical axis, and the image side of the third lens is convex near the optical axis; The fourth lens has a positive refractive power, the object side of the fourth lens is convex, and the image side of the fourth lens is convex; The fifth lens has a positive refractive power, the object side of the fifth lens is concave near the optical axis, and the image side of the fifth lens is convex near the optical axis; The sixth lens has a negative refractive power, the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is concave near the optical axis; The seventh lens has a positive refractive power; the object side of the seventh lens is convex near the optical axis, and the image side of the seventh lens is convex near the optical axis; The fourth lens is made of glass material, and the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses; The optical imaging lens having refractive power is only the above-mentioned first lens to the seventh lens; The optical imaging lens further satisfies: 7.00 ≤ TTL / AAG, where TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, and AAG is the sum of the air gaps of the first lens to the seventh lens on the optical axis.

2. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: -7.00 mm < f1 < -5.00 mm, 50.00 mm < f2 ≤ 70.00 mm, 20.00 mm < f3 < 30.00 mm, 5.00 mm < f4 < 15.00 mm, 8.00 mm < f5 < 11.00 mm, -6.00 mm < f6 < -4.00 mm, 5.00 mm < f7 < 6.50 mm, where f1, f2, f3, f4, f5, f6, f7 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens respectively.

3. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 1.00 < |f1 / f| < 2.00, 10.00 < |f2 / f| < 20.00, 4.00 < |f3 / f| < 8.00, 1.00 < |f4 / f| < 4.00, 2.00 < |f5 / f| < 3.00, 1.00 < |f6 / f| < 2.00, 1.00 < |f7 / f| < 2.00, where f is the overall 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 f7 is the focal length of the seventh lens.

4. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 1.50 < nd1 < 1.60, 50.00 < vd1 < 60.00, 1.60 < nd2 < 1.70, 18.00 < vd2 < 26.00, 1.50 < nd3 < 1.70, 50.00 < vd3 < 70.00, 1.45 < nd4 < 1.70, 50.00 < vd4 < 70.00, 1.50 < nd5 < 1.70, 50.00 < vd5 < 60.00, 1.60 < nd6 < 1.70, 18.00 < vd6 < 26.00, 1.50 < nd7 < 1.60, 50.00 < vd7 < 60.00, where nd1 - nd7 are the refractive indices of the first lens to the seventh lens respectively, and vd1 - vd7 are the dispersion coefficients of the first lens to the seventh lens respectively.

5. The optical imaging lens according to claim 1, characterized in that, It further includes an aperture stop, and the aperture stop is disposed between the third lens and the fourth lens.

6. The optical imaging lens according to claim 5, characterized in that, The optical imaging lens further satisfies: 2.00 < (f front / f rear) < 3.00, where f front is the combined focal length of the first lens, the second lens and the third lens, and f rear is the combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens.

7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 4.00 < f67 / f < 5.60; where f67 is the combined focal length of the sixth lens and the seventh lens, and f is the overall focal length of the optical imaging lens.

8. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: SD2 / SAG2 is 2.392, 2.395, 2.463 or 2.501; where SD2 is the effective aperture of the image side of the first lens, and SAG1 is the sagitta of the image side of the first lens.

9. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 1.00 < IMH / f < 1.50, where IMH is the semi-image height on the image side of the optical imaging lens, and f is the overall focal length of the optical imaging lens.

Images