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 diaphragm is arranged between the third lens and the fourth lens; 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:-0.9 lt; f / fg1lt; and-0.6. 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] The utility model relates to optical lens technology field especially relates to an optical imaging lens. BACKGROUND

[0002] With the social development, the public demand for home safety improves, and the requirement for real-time confirmation image of outdoor person visit is continuously improved, and megapixel, large aperture and night shooting are necessary conditions for such lens.

[0003] The monitoring camera lens shoots through visible light in the daytime, and uses infrared light to assist monitoring shooting at night, and in the market, the imaging focus of general lens will be offset due to using different waveband light sources, and the resolving power requirement of the lens cannot be met. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of optical imaging lenses, to solve the technical problem that current monitoring camera lens cannot meet the resolving power requirement of the lens under different waveband light source conditions.

[0005] To achieve the above-mentioned purpose, the utility model provides an optical imaging lens, the optical imaging lens includes:

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

[0007] A diaphragm; and

[0008] A 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 are arranged in order from the object side to the image side along the optical axis. The object side surface and the image side surface of the fourth lens are both convex. The object side surface and the image side surface of the fifth lens are both concave, and at least one of them is aspherical. The object side surface and the image side surface of the sixth lens are both convex, and at least one of them is aspherical.

[0009] The diaphragm is located between the third lens and the fourth lens. The focal length of the optical imaging lens is F, the combined focal length of the first lens group is fg1, and it satisfies -0.9 < F / fg1 < -0.6.

[0010] In an embodiment, the first lens has a focal length f1, and satisfies: -0.7 < F / f1 < -0.4.

[0011] In an embodiment, the second lens has a focal length f2, and satisfies: -0.3 < F / f2 < 0.

[0012] In an embodiment, the third lens has a focal length f3, and satisfies: 0.1 < F / f3 < 0.4.

[0013] In an embodiment, the fourth lens has a focal length f4, and satisfies: 0.3 < F / f4 < 0.7.

[0014] In an embodiment, the fifth lens has a focal length f5, and satisfies: -0.7 < F / f5 < -0.3.

[0015] In an embodiment, the sixth lens has a focal length f6, and satisfies: 0.7 < F / f6 < 1.0.

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

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

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

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

[0020] In an embodiment, the optical imaging lens has an aperture number FNO, and satisfies: FNO ≤ 1.6; and / or,

[0021] the optical imaging lens has a field of view FOV, and satisfies: 130° ≥ FOV ≥ 55°.

[0022] In an embodiment, the optical imaging lens further comprises an infrared filter, a protection glass and an imaging surface, wherein the infrared filter is arranged between the sixth lens and the protection glass, the protection glass is arranged between the infrared filter and the imaging surface, and the imaging surface is used for imaging.

[0023] The utility model discloses technical scheme through adopting the first mirror group, diaphragm, second mirror group three along the optical axis from the object side to the image side setting in proper order, wherein, the first mirror group and second lens include three lenses respectively, like this, six lenses along the object side to the image side setting in proper order, and the focal length F of optical imaging lens and the combination focal length fg1 of first mirror group satisfy the relation of -0.9 < F / fg1 <-0.6, can control visible light and infrared light imaging focus in a certain range, make daytime and night keep the resolving power requirement of million pixels, realize the effect of good imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the embodiment or prior art description needed to use the drawing briefly introduce, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to the structure shown in these drawings.

[0025] Figure 1 The structural schematic diagram of the optical imaging lens embodiment one provided by the utility model is shown in the figure.

[0026] Figure 2 The visible light defocus curve diagram of the optical imaging lens embodiment one provided by the utility model is shown in the figure.

[0027] Figure 3 The infrared light defocus curve diagram of the optical imaging lens embodiment one provided by the utility model is shown in the figure.

[0028] Figure 4 The structural schematic diagram of the optical imaging lens embodiment two provided by the utility model is shown in the figure.

[0029] Figure 5 The visible light defocus curve diagram of the optical imaging lens embodiment two provided by the utility model is shown in the figure.

[0030] Figure 6 The infrared light defocus curve diagram of the optical imaging lens embodiment two provided by the utility model is shown in the figure.

[0031] Figure 7 The structural schematic diagram of the optical imaging lens embodiment three provided by the utility model is shown in the figure.

[0032] Figure 8 The visible light defocus curve diagram of the optical imaging lens embodiment three provided by the utility model is shown in the figure.

[0033] Figure 9 The infrared light defocus curve diagram of the optical imaging lens embodiment three provided by the utility model is shown in the figure.

[0034] EXPLANATION OF REFERENCE NUMERALS:

[0035] 100, first mirror group; 110, first lens; 120, second lens; 130, third lens;

[0036] 200, diaphragm;

[0037] 300, second mirror group; 310, fourth lens; 320, fifth lens; 330, sixth lens;

[0038] 400, infrared filter;

[0039] 500, protective glass;

[0040] 600, imaging surface.

[0041] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

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

[0044] In addition, if the embodiments of the utility model involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one feature. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B simultaneously meet the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0045] In the prior art, the monitoring camera lens shoots through visible light in the daytime, and uses infrared light to assist monitoring shooting at night, and in the market, the imaging focus of a general lens will be offset due to using different wavebands of light sources, which cannot meet the resolving power requirement of the lens.

[0046] The utility model provides a kind of optical imaging lens.

[0047] Please refer to Figure 1 、 Figure 4 And Figure 7 In the utility model embodiment, the optical imaging lens comprises: a first lens group 100, a diaphragm 200 and a second lens group 300, and the three are sequentially arranged along an optical axis O from the object side to the image side. Wherein, the first lens group 100 comprises a first lens 110 and a second lens 120 with negative refractive power and a third lens 130 with positive refractive power, and the three are sequentially arranged along the optical axis O from the object side to the image side, wherein 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 concave, and the image side is convex, and at least one of the object side and the image side of the second lens 120 is aspherical, the object side of the third lens 130 is concave, and the image side is convex, and at least one of the object side and the image side of the third lens 130 is aspherical; diaphragm 200; the second lens group 300 comprises 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 sequentially arranged along the optical axis O from the object side to the image side, wherein the object side and the image side of the fourth lens 310 are both convex, the object side and the image side of the fifth lens 320 are both concave and at least one is aspherical, and the object side and the image side of the sixth lens 330 are both convex and at least one is aspherical; the focal length of the optical imaging lens is F, the combined focal length of the first lens group 100 is fg1, and it satisfies: -0.9<F / fg1<-0.6.

[0048] Based on the above, in the specific implementation process, the first lens 110, the second lens 120, the third lens 130, the diaphragm 200, the fourth lens 310, the fifth lens 320 and the sixth lens 330 are sequentially installed 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 direction and an image side facing the image side direction.

[0049] Wherein, the first lens 110 is a convex-concave lens, that is, the object side S1 of the first lens 110 is an arc surface protruding towards the object side, and the image side S2 is a concave surface.

[0050] The second lens 120 is a meniscus lens, that is, the object side S3 of the second lens 120 is a concave surface, the image side S4 is a convex surface, and at least one of the object side S3 and the image side S4 of the second lens 120 is an aspheric surface; the optical axis O passes through the object side S3 and the image side S4.

[0051] The third lens 130 is a double convex lens, that is, the object side S5 and the image side S6 of the third lens 130 are both convex surfaces, and at least one of the object side S5 and the image side S6 of the third lens 130 is an aspheric surface, and the optical axis O passes through the object side S5 and the image side S6.

[0052] The fourth lens 310 is a double convex lens, that is, the object side S7 and the image side S8 of the fourth lens 310 are both convex surfaces, the side of the fourth lens 310 towards the object side is the object side S7 and is a convex arc surface, the side of the fourth lens 310 towards the image side is the image side S8 and is a convex arc surface, and the optical axis O passes through the object side S7 and the image side S8.

[0053] The fifth lens 320 is a double concave lens, that is, the object side S9 and the image side S10 of the fifth lens 320 are both concave surfaces, and at least one of the object side S9 and the image side S10 of the fifth lens 320 is an aspheric surface, and the optical axis O passes through the object side S9 and the image side S10.

[0054] The sixth lens 330 is a double convex lens, that is, the object side S11 and the image side S12 of the sixth lens 330 are both convex surfaces, at least one of the object side and the image side of the sixth lens 330 is an aspheric surface, and the optical axis O passes through the object side S11 and the image side S12.

[0055] The technical scheme of the utility model discloses a first mirror group, diaphragm 200, second mirror group three along the optical axis O from the object side to the image side sequentially, wherein, first mirror group and second lens 120 respectively include three lenses, in this way, six lenses along the object side to the image side sequentially, and the focal length F of the optical imaging lens and the combined focal length f g1 of the first mirror group 100 satisfy the relationship-0.9 < F / f g1 <-0.6, can control visible light and infrared light imaging focus in a certain range, make daytime and night keep the resolving power requirement of million pixels, realize the effect of good imaging quality, can keep the imaging clarity of relatively perfect in daytime and night, be applicable to doorbell camera system.

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

[0057] -0.7 < F / f1 <-0.4;

[0058] -0.3 < F / f2 < 0;

[0059] 0.1 <F / f3<0.4;

[0060] 0.3 <F / f4<0.7;

[0061] -0.7 <F / f5<-0.3;

[0062] 0.7 <F / f6<1.0;

[0063] FNO≤1.6;

[0064] 130° ≥ FOV ≥ 55°;

[0065] Where F is the focal length of the optical imaging lens, fg1 is the combined focal length of the first lens group 100, f1 is the focal length of the first lens 110, f2 is the focal length of the second lens 120, f3 is the focal length of the third lens 130, f4 is the focal length of the fourth lens 310, f5 is the focal length of the fifth lens 320, and f6 is the focal length of the sixth lens 330. FNO is the aperture number of the optical imaging lens, and FOV is the field of view of the optical imaging lens.

[0066] In the specific implementation process, the object side S3 and image side S4 of the second lens 120 are both aspherical, the object side S5 and image side S6 of the third lens 120 are both aspherical, the object side S9 and image side S10 of the fifth lens 320 are both aspherical, and the object side S11 and image side S12 of the sixth lens 330 are both aspherical.

[0067] 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, Abbe constant Vd, and effective aperture D, in mm. Taking the first lens 110 as an example, the numbers 1 and 2 in the table below represent the two surfaces of the first lens 110 in the direction from the object side to the image side, and so on. Numbers 16 and 17 represent the two surfaces of the protective glass 500 in the direction from the object side to the image side.

[0070]

[0071] In addition, in the present embodiment, the aspherical surface profile shape Z of the object side S3 and the image side S4 of the second lens 120, the object side S5 and the image side S6 of the third lens 130, the object side S9 and the image side S10 of the fifth lens 320, and the object side S11 and the image side S12 of the sixth lens 330 are obtained by the following formula:

[0072]

[0073] wherein,

[0074] Z: aspherical surface profile shape;

[0075] c: reciprocal of the radius of curvature;

[0076] h: half height of the surface off-axis;

[0077] k: conic coefficient;

[0078] A4, A6, A8, A10, A12, A14 and A16: respective order coefficients of the half height of the surface off-axis h.

[0079] In the present embodiment, the conic coefficient k, the radius of curvature R, and A4, A6, A8, A10, A12, A14 and A16 of the second lens 120 of the optical imaging lens and the image side S4 of the object side S3, and the object side S5 and the image side S6 of the third lens 130 are shown in the following table:

[0080] S3 S4 S5 S6 k 0.00E+00 0.00E+00 2.27E+01 -7.31E+00 A2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 -1.06E-02 -2.15E-02 -1.15E-02 -1.45E-03 A6 2.37E-03 5.02E-03 2.48E-03 4.25E-05 A8 -6.20E-05 -4.89E-04 -2.42E-04 3.38E-05 A10 -1.35E-08 2.99E-05 1.03E-05 -6.23E-06 A12 1.70E-08 6.53E-08 1.73E-07 4.60E-07 A14 -1.13E-08 4.17E-08 1.17E-09 -2.70E-11 A16 6.43E-10 -4.87E-09 3.66E-09 2.56E-10 R -3.53E+00 -7.08E+00 5.24E+01 -1.04E+01

[0081] In the present embodiment, the conic coefficient k, the radius of curvature R, and A4, A6, A8, A10, A12, A14 and A16 of the fifth lens 320 of the optical imaging lens and the image side S10 of the object side S9, and the object side S11 and the image side S12 of the sixth lens 330 are shown in the following table:

[0082] S9 S10 S11 S12 k -5.00E+01 -5.50E+00 -3.06E-01 1.47E+00 A2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 -1.92E-02 -5.23E-03 -1.71E-02 1.62E-03 A6 4.00E-03 1.25E-03 4.38E-03 1.37E-06 A8 -9.70E-04 -2.32E-04 -1.05E-03 9.19E-05 A10 1.77E-04 3.01E-06 1.67E-04 -2.10E-05 A12 -1.97E-05 4.84E-06 -1.59E-05 3.52E-06 A14 1.54E-06 -6.46E-07 8.37E-07 -3.00E-07 A16 -6.63E-08 2.48E-08 -1.91E-08 1.24E-08 R 6.90E+00 2.25E+00 3.65E+00 -5.13E+00

[0083] The imaging quality of the optical imaging lens is verified by the simulation data of the optical imaging lens in the present embodiment, and the reference Figure 2 is the visible light defocus curve diagram, Figure 3 is the infrared light defocus curve diagram, which can effectively improve the imaging quality.

[0084] Embodiment Two

[0085] Based on the above, the reference Figures 4 to 6As shown, in the present embodiment, the diaphragm 200 is arranged close to the third lens 130, the imaging surface 600 is arranged at a distance from the protective glass 500, and the filter is arranged close to the sixth lens 330. The following table shows the system parameters of the optical imaging lens of the present embodiment, wherein the parameters are the radius of curvature r, the central thickness d, the refractive index Nd, the Abbe number Vd, and the effective aperture D, and the unit is mm. For example, the first lens 110, the surface numbers 1 and 2 in the following table represent the two surfaces of the first lens 110 from the object side to the image side, and so on, the surface numbers 16 and 17 represent the two surfaces of the protective glass 500 from the object side to the image side.

[0086]

[0087] In addition, in the present embodiment, the aspherical surface profile shape Z of the object side surface S3 and the image side surface S4 of the second lens 120, the object side surface S5 and the image side surface S6 of the third lens 130, the object side surface S9 and the image side surface S10 of the fifth lens 320, and the object side surface S11 and the image side surface S12 of the sixth lens 330 are obtained by the following formula:

[0088]

[0089] wherein,

[0090] Z: aspherical surface profile shape;

[0091] c: reciprocal of the radius of curvature;

[0092] h: off-axis half height of the surface;

[0093] k: conic coefficient;

[0094] A4, A6, A8, A10, A12, A14, and A16: respective order coefficients of the off-axis half height h of the surface.

[0095] In the present embodiment, the conic coefficient k, the radius of curvature R, and A4, A6, A8, A10, A12, A14, and A16 of the object side surface S3 and the image side surface S4 of the second lens 120, and the object side surface S5 and the image side surface S6 of the third lens 130 of the optical imaging lens are shown in the following table:

[0096] S3 S4 S5 S6 k 0.00E+00 0.00E+00 2.90E+01 -7.23E+00 A2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 -6.59E-03 -1.64E-02 -1.03E-02 -1.66E-03 A6 2.05E-03 4.16E-03 2.31E-03 5.12E-05 A8 -3.10E-05 -3.90E-04 -2.63E-04 2.78E-05 A10 -1.39E-07 2.56E-05 1.62E-05 -5.67E-06 A12 -9.81E-08 0.00E+00 -1.52E-07 4.48E-07 A14 1.10E-09 -2.29E-08 -7.26E-10 -4.78E-09 A16 -1.90E-09 -1.19E-09 -3.24E-10 -3.23E-12 R -3.24E+00 -5.87E+00 5.55E+01 -1.08E+01

[0097] In the present embodiment, the conic coefficient k, the radius of curvature R, and A4, A6, A8, A10, A12, A14, and A16 of the object side surface S9 and the image side surface S10 of the fifth lens 320, and the object side surface S11 and the image side surface S12 of the sixth lens 330 of the optical imaging lens are shown in the following table:

[0098]

[0099]

[0100] The imaging quality of the optical imaging lens is verified by the simulation data of the optical imaging lens in this embodiment. Referring to FIGS. 11A and 11B, Figure 5 is a visible light defocus curve diagram, Figure 6 is an infrared light defocus curve diagram, and the imaging quality can be effectively improved.

[0101] Embodiment Three

[0102] Based on the above, referring to FIG. 12, Figures 7 to 9 in this embodiment, the third lens 130 and the fourth lens 310 are arranged close to the diaphragm 200, and the imaging surface 600 has a certain distance from the protective glass 500. The following table is the system parameters of the optical imaging lens in this embodiment, wherein the parameters are the radius of curvature r, the central thickness d, the refractive index Nd, the Abbe number Vd, and the effective aperture D, and the unit is mm. Taking the first lens 110 as an example, the surface numbers 1 and 2 in the following table represent the two surfaces of the first lens 110 from the object side to the image side, and so on. The surface numbers 16 and 17 represent the two surfaces of the protective glass 500 from the object side to the image side.

[0103]

[0104] In addition, in this embodiment, the aspherical surface profile shape Z of the object side surface S3 and the image side surface S4 of the second lens 120, the object side surface S5 and the image side surface S6 of the third lens 130, the object side surface S9 and the image side surface S10 of the fifth lens 320, and the object side surface S11 and the image side surface S12 of the sixth lens 330 are obtained by the following formula:

[0105]

[0106] wherein,

[0107] Z: aspherical surface profile shape;

[0108] c: reciprocal of the radius of curvature;

[0109] h: half height of the surface away from the axis;

[0110] k: conic coefficient;

[0111] A4, A6, A8, A10, A12, A14, and A16: each order coefficient of the half height h of the surface away from the axis.

[0112] In the embodiment, the conic coefficients k, the curvature radius R, and A4, A6, A8, A10, A12, A14 and A16 of the object side S3 and the image side S4 of the second lens 120, and the object side S5 and the image side S6 of the third lens 130 of the optical imaging lens are shown in the following table:

[0113] S3 S4 S5 S6 k 0.00E+00 0.00E+00 2.08E+01 -7.43E+00 A2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 -9.12E-03 -1.78E-02 -9.24E-03 -1.45E-03 A6 1.94E-03 3.73E-03 1.40E-03 -1.48E-04 A8 -3.33E-05 -3.26E-04 -9.97E-05 4.46E-05 A10 0.00E+00 2.37E-05 2.94E-06 -6.02E-06 A12 0.00E+00 0.00E+00 1.82E-07 3.60E-07 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 -3.58E+00 -7.85E+00 2.43E+01 -1.53E+01

[0114] In the embodiment, the conic coefficients k, the curvature radius R, and A4, A6, A8, A10, A12, A14 and A16 of the object side S9 and the image side S10 of the fifth lens 320, and the object side S11 and the image side S12 of the sixth lens 330 of the optical imaging lens are shown in the following table:

[0115]

[0116]

[0117] The imaging quality of the optical imaging lens is verified by the simulation data of the optical imaging lens in the embodiment, and the imaging quality can be effectively improved. Figure 8 is a visible light defocus curve diagram, Figure 9 is an infrared light defocus curve diagram.

[0118] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like within the inventive concept of the present application, and the contents of the present application specification and drawings are included in the patent protection scope of the present application.

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 concave and the image side is convex. 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: -0.9 <F / fg1<-0.6。 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: -0.7 <F / f1<-0.4。 3. The optical imaging lens as described in claim 1, characterized in that, The second lens has a focal length of f2 and satisfies: -0.3 <F / f2<0。 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: 0.3 <F / f4<0.7。 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: 0.7 <F / f6<1.0。 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 ≤ 1.6; and / or, The field of view of the optical imaging lens is FOV, and satisfies: 130°≥FOV≥55°.

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