Optical imaging lens

Abstract

The utility model discloses an optical imaging lens, which relates to the field of optical lenses, and comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and a sixth lens group, the object side surface of the third lens is a concave surface, the image side surface is a convex surface, and at least one is an aspheric surface; a diaphragm; the second lens group comprises a fourth lens, an object side surface and an image side surface of the fourth lens are convex surfaces, an object side surface and an image side surface of the fifth lens are concave surfaces, at least one of the object side surface and the image side surface of the fifth lens is an aspheric surface, and an object side surface and an image side surface of the sixth lens are convex surfaces, at least one of the object side surface and the image side surface of the sixth lens is an aspheric surface; the focal length of the optical imaging lens is F, the combined focal length of the first lens group is fg1, and the following conditions are satisfied:-0.5 lt; f / fg1lt; 0. The optical imaging lens provided by the technical scheme of the utility model can realize the effect of good imaging quality.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, and in particular to an optical imaging lens. Background Technology

[0002] In recent years, CMOS and CCD-based camera lenses have been widely used in various fields, especially wide-angle lenses, including ultra-wide-angle lenses and fisheye lenses, which are playing an increasingly important role. In photography, wide-angle lenses feature short focal lengths and large fields of view, producing significant barrel distortion to create special effects and deliver a strong visual impact to the observer. In measurement, wide-angle lenses utilize their large field of view to acquire more data in a single image, capturing more scene information. With societal development and increasing public demand for home security, the requirement for real-time, reliable images of people visiting outdoors is constantly rising; megapixel resolution, large aperture, and night-time shooting capabilities have become essential requirements for these lenses.

[0003] The focal length of a typical lens will shift depending on the light source used. In the market, nighttime surveillance uses infrared light to assist in monitoring and shooting, while daytime shooting uses visible light. This causes the focal length to shift, resulting in blurred images that cannot meet the resolution requirements of the lens. Utility Model Content

[0004] The main purpose of this invention is to provide an optical imaging lens that solves the technical problem that current surveillance camera lenses cannot meet the resolution requirements under different wavelength light source conditions.

[0005] To achieve the above objectives, the optical imaging lens proposed in this utility model comprises, along an optical axis from the object side to the image side, the following:

[0006] The first lens group includes a first lens and a second lens with negative refractive power and a third lens with positive refractive power, and the three are arranged sequentially along the optical axis from the object side to the image side. The object side of the first lens is convex and the image side is concave. The object side of the second lens is convex and the image side is concave. At least one of the object side and the image side of the second lens is aspherical. The object side of the third lens is concave and the image side is convex. At least one of the object side and the image side of the third lens is aspherical.

[0007] Aperture; and

[0008] The second lens group includes a fourth lens with positive refractive power, a fifth lens with negative refractive power, and a sixth lens with positive refractive power, and the three lenses are arranged sequentially along the optical axis from the object side to the image side. The object side and image side of the fourth lens are both convex, the object side and image side of the fifth lens are both concave and at least one is aspherical, and the object side and image side of the sixth lens are both convex and at least one is aspherical.

[0009] The aperture stop is positioned between the third lens and the fourth lens; the focal length of the optical imaging lens is F, and the combined focal length of the first lens group is fg1, satisfying: -0.5 <F / fg1<0。

[0010] In one embodiment, the focal length of the first lens is f1, and satisfies: -0.4 <F / f1<-0.1。

[0011] In one embodiment, the focal length of the second lens is f2, and satisfies: -0.5 <F / f2<-0.1。

[0012] In one embodiment, the focal length of the third lens is f3, and satisfies: 0.1 <F / f3<0.4。

[0013] In one embodiment, the focal length of the fourth lens is f4, and satisfies: 0.2 <F / f4<0.5。

[0014] In one embodiment, the focal length of the fifth lens is f5, and satisfies: -0.7 <F / f5<-0.3。

[0015] In one embodiment, the focal length of the sixth lens is f6, and satisfies: 0.2 <F / f6<0.6。

[0016] In one embodiment, both the object-side surface and the image-side surface of the second lens are aspherical; and / or,

[0017] The object-side and image-side surfaces of the third lens are both aspherical; and / or,

[0018] The object-side and image-side surfaces of the fifth lens are both aspherical; and / or,

[0019] The object-side and image-side surfaces of the sixth lens are both aspherical.

[0020] In one embodiment, the aperture number of the optical imaging lens is FNO, and satisfies: FNO ≤ 2.0; and / or,

[0021] The field of view of the optical imaging lens is FOV, and satisfies: 180°≥FOV≥150°.

[0022] In one embodiment, the optical imaging lens further includes an infrared filter, a protective glass, and an imaging surface. Among them, the infrared filter is disposed between the sixth lens and the protective glass, the protective glass is disposed between the infrared filter and the imaging surface, and the imaging surface is used for imaging.

[0023] In the technical solution of the present utility model, the first lens group, the aperture stop, and the second lens group are sequentially arranged along the optical axis from the object side to the image side. Among them, the first lens group and the second lens group each include three lenses. In this way, the six lenses are sequentially arranged from the object side to the image side, and the focal length F of the optical imaging lens and the combined focal length fg1 of the first lens group satisfy the relationship of -0.5 < F / fg1 < 0, which can control the imaging foci of visible light and infrared light within a certain range, so as to maintain the resolution requirement of one million pixels during day and night, achieving the effect of good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Visible light defocus curve of embodiment three of the optical imaging lens provided by this utility model;

[0033] Figure 9 Infrared defocus curve of embodiment three of the optical imaging lens provided by this utility model.

[0034] Explanation of icon numbers:

[0035] 100. First lens group; 110. First lens; 120. Second lens; 130. Third lens;

[0036] 200. Aperture;

[0037] 300. Second lens group; 310. Fourth lens; 320. Fifth lens; 330. Sixth lens;

[0038] 400. Infrared filter;

[0039] 500. Protective glass;

[0040] 600, Imaging plane.

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0043] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] In existing technologies, the imaging focus of a typical lens will shift depending on the light source used. In the market, infrared light is used to assist in nighttime surveillance and visible light is used for daytime surveillance, which causes the imaging focus to shift, resulting in blurred images that cannot meet the resolution requirements of the lens.

[0046] This invention proposes an optical imaging lens.

[0047] Please see Figure 1 , Figure 4 and Figure 7 In this embodiment of the invention, the optical imaging lens includes a first lens group 100, an aperture 200, and a second lens group 300, which are arranged sequentially along an optical axis O from the object side to the image side. The first lens group 100 includes a first lens 110 with negative refractive power, a second lens 120, and a third lens 130 with positive refractive power, arranged sequentially along the optical axis O from the object side to the image side. The object side of the first lens 110 is convex, and the image side is concave. The object side of the second lens 120 is convex, and the image side is concave, with at least one of the object side and image side being aspherical. The object side of the third lens 130 is concave, and the image side is convex, with at least one of the object side and image side being aspherical. The aperture 200... 00; The second lens group 300 includes a fourth lens 310 with positive refractive power, a fifth lens 320 with negative refractive power, and a sixth lens 330 with positive refractive power, and the three are arranged sequentially along the optical axis O from the object side to the image side. The object-side and image-side surfaces of the fourth lens 310 are both convex, the object-side and image-side surfaces of the fifth lens 320 are both concave and at least one is aspherical, and the object-side and image-side surfaces of the sixth lens 330 are both convex and at least one is aspherical. The focal length of the optical imaging lens is F, and the combined focal length of the first lens group 100 is fg1, satisfying: -0.5 <F / fg1<0。

[0048] Based on the above, in the specific implementation process, the first lens 110, the second lens 120, the third lens 130, the aperture 200, the fourth lens 310, the fifth lens 320 and the sixth lens 330 are installed sequentially along the optical axis O from the object side to the image side, and the six lenses respectively have an object side facing the object side and an image side facing the image side.

[0049] The first lens 110 is a convex-concave lens, that is, the object side S1 of the first lens 110 is an arc surface that convexes towards the object side, and the image side S2 is a concave surface. Specifically, the part near the optical axis O is the image side S2 that is concave towards the image side, and the part near the edge of the first lens 110 is a plane.

[0050] The second lens 120 is a convex-concave lens, that is, the object-side surface S3 of the second lens 120 is convex and the image-side surface S4 is concave. Specifically, the part near the optical axis O is the image-side surface S4 which is concave towards the image side, and the part near the edge of the second lens 120 is a plane. At least one of the object-side surface S3 and the image-side surface S4 of the second lens 120 is an aspherical surface; the optical axis O passes through the object-side surface S3 and the image-side surface S4.

[0051] The third lens 130 is a concave-convex lens. Specifically, the object-side surface S5 of the third lens 130 is concave, the image-side surface S6 is convex, and at least one of the object-side surface S5 and the image-side surface S6 of the third lens 130 is an aspherical surface. The optical axis O passes through the object-side surface S5 and the image-side surface S6.

[0052] The fourth lens 310 is a biconvex lens. Specifically, both the object-side surface S7 and the image-side surface S8 of the fourth lens 310 are convex surfaces. The object-side surface of the fourth lens 310 is the object-side surface S7, which is a convex arc surface. The image-side surface of the fourth lens 310 is the image-side surface S8, which is also a convex arc surface. The optical axis O passes through the object-side surface S7 and the image-side surface S8.

[0053] The fifth lens 320 is a biconcave lens, that is, both the object-side surface S9 and the image-side surface S10 of the fifth lens 320 are concave surfaces. Specifically, the portions of the object-side surface S9 and the image-side surface S10 near the optical axis O are concave surfaces facing each other, while the portions near the edge of the fifth lens 320 are flat surfaces. At least one of the object-side surface S9 and the image-side surface S10 of the fifth lens 320 is an aspherical surface, and the optical axis O passes through the object-side surface S9 and the image-side surface S10.

[0054] The sixth lens 330 is a biconvex lens. Specifically, the object-side surface S11 and the image-side surface S12 of the sixth lens 330 are both convex surfaces that bulge in opposite directions. At least one of the object-side surface and the image-side surface of the sixth lens 330 is an aspherical surface, and the optical axis O passes through the object-side surface S11 and the image-side surface S12.

[0055] The technical solution of the present utility model is to arrange the first lens group, the aperture stop 200, and the second lens group along the optical axis O in sequence from the object side to the image side. Among them, the first lens group and the second lens 120 each include three lenses. In this way, the six lenses are arranged in sequence from the object side to the image side, and the focal length F of the optical imaging lens and the combined focal length fg1 of the first lens group 100 satisfy the relationship of -0.5 < F / fg1 < 0, which can control the imaging foci of visible light and infrared light within a certain range, enabling the resolution requirement of one million pixels to be maintained during both day and night, achieving the effect of good imaging quality, maintaining relatively perfect imaging clarity both during day and night, and being applicable to the doorbell camera system.

[0056] Furthermore, in order to enable the optical imaging lens to maintain good optical performance and high imaging quality, during the specific implementation process, the optical imaging lens satisfies the following conditions:

[0057] -0.4 < F / f1 < -0.1;

[0058] -0.5 < F / f2 < -0.1;

[0059] 0.1 < F / f3 < 0.4;

[0060] 0.2 < F / f4 < 0.5;

[0061] -0.7 < F / f < 5 -0.3;

[0062] 0.2 < F / f6 < 0.6;

[0063] FNO ≤ 2.0;

[0064] 180° ≥ FOV ≥ 150°; [[ID=​​​​​​​In addition, in the specific implementation process, the optical imaging lens also includes an infrared filter 400, a protective glass 500, and an imaging surface 600. The infrared filter 400 is disposed between the sixth lens 330 and the protective glass 500 to filter out excess infrared light in the image light, thereby improving image quality. The protective glass 500 is disposed between the infrared filter 400 and the imaging surface 600 to protect the imaging surface 600, which is used for imaging.

[0068] Example 1

[0069] Based on the above, refer to Figures 1 to 3 As shown, in this embodiment, the aperture stop 200 is positioned close to the fourth lens 310, and the imaging surface 600 is positioned close to the protective glass 500. The table below shows the system parameters of the optical imaging lens in this embodiment, where the parameters are the radius of curvature r, center thickness d, refractive index Nd, and effective aperture D, in mm. Taking the first lens 110 as an example, in the table below, serial numbers 2 and 3 represent the two surfaces of the first lens 110 in the direction from the object side to the image side, and so on, with serial number 19 representing the imaging surface 600.

[0070]

[0071] In this embodiment, the focal length of the optical imaging lens is F = 1.41 mm, the distance TTL from the object side surface S1 of the first lens 110 to the imaging surface 600 on the optical axis O is 14.71 mm, the maximum field of view FOV is 178°, and the aperture number FNO is 2.0.

[0072] Furthermore, in this embodiment, the aspherical surface profile shape Z of the object-side surface S3 and image-side surface of the second lens 120, the object-side surface S5 and image-side surface S6 of the third lens 130, the object-side surface S9 and image-side surface S10 of the fifth lens 320, and the object-side surface S11 and image-side surface S12 of the sixth lens 330 is obtained by the following formula:

[0073]

[0074] in,

[0075] Z: Aspherical surface profile shape;

[0076] c: the reciprocal of the radius of curvature;

[0077] h: Off-axis half-height of the surface;

[0078] k: Conic coefficient;

[0079] A4, A6, A8, A10, A12, A14 and A16: Coefficients of each order of the off-axis half-height h of the surface.

[0080] In this embodiment, the conic coefficient k, radius of curvature R, and coefficients A4, A6, A8, A10, A12, A14, and A16 of the object-side surface S3 and image-side surface S4 of the second lens 120 and the third lens 130, and the object-side surface S5 and image-side surface S6 of the optical imaging lens are shown in the table below:

[0081] S3 S4 S5 S6 k 4.12E+00 -1.99E-01 1.40E+00 -2.33E-01 A2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 -1.81E-04 -2.00E-04 1.91E-03 -5.16E-03 A6 -3.28E-06 6.43E-06 5.35E-03 4.84E-03 A8 -1.02E-06 2.40E-04 -5.22E-04 -1.28E-03 A10 2.77E-04 9.29E-05 -6.69E-05 8.12E-05 A12 6.18E-05 -4.70E-05 -6.52E-06 7.58E-05 A14 -1.54E-10 3.73E-06 -1.38E-06 -3.16E-06 A16 -2.14E-11 5.74E-08 -3.01E-07 -1.03E-05 R 7.83 1.72 -4.89 -3.49

[0082] In this embodiment, the conic coefficient k, radius of curvature R, and coefficients A4, A6, A8, A10, A12, A14, and A16 of the object-side surface S9 and image-side surface S10 of the fifth lens 320 and the object-side surface S11 and image-side surface S12 of the sixth lens 330 are shown in the following table:

[0083]

[0084]

[0085] The imaging quality of the optical imaging lens is verified using various simulated data from the optical imaging lens in this embodiment, with reference to... Figure 2 This is a visible light defocus curve. Figure 3 The infrared defocus curve can effectively improve image quality.

[0086] Example 2

[0087] Based on the above, refer to Figures 4 to 6 As shown, in this embodiment, the aperture stop 200 is positioned close to the fourth lens 310, and the imaging surface 600 is positioned close to the protective glass 500. The table below shows the system parameters of the optical imaging lens in this embodiment, where the parameters are the radius of curvature r, center thickness d, refractive index Nd, and effective aperture D, in mm. Taking the first lens 110 as an example, in the table below, numbers 2 and 3 represent the two surfaces of the first lens 110 in the direction from the object side to the image side, and so on, with number 19 representing the imaging surface 600.

[0088]

[0089]

[0090] In this embodiment, the focal length of the optical imaging lens is F = 1.42 mm, the distance TTL from the object side surface S1 of the first lens 110 to the imaging surface 600 on the optical axis O is 15.65 mm, the maximum field of view FOV is 180°, and the aperture number FNO is 2.0.

[0091] Furthermore, in this embodiment, the aspherical surface profile shape Z of the object-side surface S3 and image-side surface of the second lens 120, the object-side surface S5 and image-side surface S6 of the third lens 130, the object-side surface S9 and image-side surface S10 of the fifth lens 320, and the object-side surface S11 and image-side surface S12 of the sixth lens 330 is obtained by the following formula:

[0092]

[0093] in,

[0094] Z: Aspherical surface profile shape;

[0095] c: the reciprocal of the radius of curvature;

[0096] h: Off-axis half-height of the surface;

[0097] k: Conic coefficient;

[0098] A4, A6, A8, A10, A12, A14 and A16: Coefficients of each order of the off-axis half-height h of the surface.

[0099] In this embodiment, the conic coefficient k, radius of curvature R, and coefficients A4, A6, A8, A10, A12, A14, and A16 of the object-side surface S3 and image-side surface S4 of the second lens 120 and the third lens 130, and the object-side surface S5 and image-side surface S6 of the optical imaging lens are shown in the table below:

[0100]

[0101]

[0102] In this embodiment, the conic coefficient k, radius of curvature R, and coefficients A4, A6, A8, A10, A12, A14, and A16 of the object-side surface S9 and image-side surface S10 of the fifth lens 320 and the object-side surface S11 and image-side surface S12 of the sixth lens 330 are shown in the following table:

[0103] S9 S10 S11 S12 k -6.46E-01 1.05E+00 -2.57E+00 -4.76E-01 A2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 2.54E-03 7.83E-03 -5.80E-03 9.40E-03 A6 -5.28E-05 3.09E-03 -5.83E-04 1.07E-03 A8 2.63E-03 -8.84E-04 1.27E-03 -3.79E-04 A10 -2.28E-03 2.93E-04 -2.14E-04 5.03E-04 A12 1.41E-08 -5.10E-06 -7.13E-05 -5.07E-05 A14 -2.87E-09 -9.01E-06 -5.44E-06 -1.02E-04 A16 5.78E-04 -2.77E-05 -2.72E-06 -1.13E-05 R -3.97 3.32 4.33 -5.69

[0104] The imaging quality of the optical imaging lens is verified using various simulated data from the optical imaging lens in this embodiment, with reference to... Figure 5 This is a visible light defocus curve. Figure 6 The infrared defocus curve can effectively improve image quality.

[0105] Example 3

[0106] Based on the above, refer to Figures 7 to 9As shown, in this embodiment, the aperture stop 200 is positioned close to the fourth lens 310, and the imaging surface 600 is positioned close to the protective glass 500. The table below shows the system parameters of the optical imaging lens in this embodiment, where the parameters are the radius of curvature r, center thickness d, refractive index Nd, and effective aperture D, in mm. Taking the first lens 110 as an example, in the table below, numbers 2 and 3 represent the two surfaces of the first lens 110 in the direction from the object side to the image side, and so on, with number 19 representing the imaging surface 600.

[0107]

[0108]

[0109] Furthermore, in this embodiment, the aspherical surface profile shape Z of the object-side surface S3 and image-side surface of the second lens 120, the object-side surface S5 and image-side surface S6 of the third lens 130, the object-side surface S9 and image-side surface S10 of the fifth lens 320, and the object-side surface S11 and image-side surface S12 of the sixth lens 330 is obtained by the following formula:

[0110]

[0111] in,

[0112] Z: Aspherical surface profile shape;

[0113] c: the reciprocal of the radius of curvature;

[0114] h: Off-axis half-height of the surface;

[0115] k: Conic coefficient;

[0116] A4, A6, A8, A10, A12, A14 and A16: Coefficients of each order of the off-axis half-height h of the surface.

[0117] In this embodiment, the conic coefficient k, radius of curvature R, and coefficients A4, A6, A8, A10, A12, A14, and A16 of the object-side surface S3 and image-side surface S4 of the second lens 120 and the third lens 130, and the object-side surface S5 and image-side surface S6 of the optical imaging lens are shown in the table below:

[0118]

[0119]

[0120] In this embodiment, the conic coefficient k, radius of curvature R, and coefficients A4, A6, A8, A10, A12, A14, and A16 of the object-side surface S9 and image-side surface S10 of the fifth lens 320 and the object-side surface S11 and image-side surface S12 of the sixth lens 330 are shown in the following table:

[0121] S9 S10 S11 S12 k 5.25E+00 -4.25E+00 -3.25E+00 -2.33E-01 A2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 -2.17E-03 -8.84E-04 -6.03E-03 -2.01E-03 A6 1.44E-04 -4.41E-04 -2.10E-03 -6.51E-04 A8 -3.26E-03 -1.51E-04 -1.73E-04 3.70E-04 A10 7.26E-08 -1.12E-04 -1.67E-04 1.23E-05 A12 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A14 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 R -4.35 3.34 2.56 -3.67

[0122] The imaging quality of the optical imaging lens is verified using various simulated data from the optical imaging lens in this embodiment, with reference to... Figure 8 This is a visible light defocus curve. Figure 9 The infrared defocus curve can effectively improve image quality.

[0123] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the inventive concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens, along an optical axis from the object side to the image side, includes: The first lens group includes a first lens and a second lens with negative refractive power and a third lens with positive refractive power, and the three are arranged sequentially along the optical axis from the object side to the image side. The object side of the first lens is convex and the image side is concave. The object side of the second lens is convex and the image side is concave. At least one of the object side and the image side of the second lens is aspherical. The object side of the third lens is concave and the image side is convex. At least one of the object side and the image side of the third lens is aspherical. Aperture; and The second lens group includes a fourth lens with positive refractive power, a fifth lens with negative refractive power, and a sixth lens with positive refractive power, and the three lenses are arranged sequentially along the optical axis from the object side to the image side. The object side and image side of the fourth lens are both convex, the object side and image side of the fifth lens are both concave and at least one is aspherical, and the object side and image side of the sixth lens are both convex and at least one is aspherical. The aperture stop is positioned between the third lens and the fourth lens; the focal length of the optical imaging lens is F, and the combined focal length of the first lens group is fg1, satisfying: -0.5 <F / fg1<0。 2. The optical imaging lens as described in claim 1, characterized in that, The focal length of the first lens is f1, and it satisfies: -0.4 <F / f1<-0.1。 3. The optical imaging lens as described in claim 1, characterized in that, The second lens has a focal length of f2 and satisfies: -0.5 <F / f2<-0.1。 4. The optical imaging lens as described in claim 1, characterized in that, The focal length of the third lens is f3, and it satisfies: 0.1 <F / f3<0.4。 5. The optical imaging lens as described in claim 1, characterized in that, The fourth lens has a focal length of f4 and satisfies: 0.2 <F / f4<0.5。 6. The optical imaging lens as described in claim 1, characterized in that, The fifth lens has a focal length of f5 and satisfies: -0.7 <F / f5<-0.3。 7. The optical imaging lens as described in claim 1, characterized in that, The sixth lens has a focal length of f6 and satisfies: 0.2 <F / f6<0.6。 8. The optical imaging lens as described in claim 1, characterized in that, The object-side and image-side surfaces of the second lens are both aspherical; and / or, The object-side and image-side surfaces of the third lens are both aspherical; and / or, The object-side and image-side surfaces of the fifth lens are both aspherical; and / or, The object-side and image-side surfaces of the sixth lens are both aspherical.

9. The optical imaging lens as described in claim 1, characterized in that, The aperture number of the optical imaging lens is FNO, and satisfies: FNO ≤ 2.0; and / or, The field of view of the optical imaging lens is FOV, and satisfies: 180°≥FOV≥150°.

10. The optical imaging lens according to any one of claims 1-9, characterized in that, The optical imaging lens further includes an infrared filter, a protective glass, and an imaging surface. The infrared filter is disposed between the sixth lens and the protective glass, the protective glass is disposed between the infrared filter and the imaging surface, and the imaging surface is used for imaging.

Images