Optical imaging lens

Abstract

The application provides an optical imaging lens. The optical imaging lens comprises, in sequence from an object side to an image side, a variable aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; wherein the effective focal length of the second lens is positive in sign, and the effective focal length of the third lens is negative in sign; the curvature radius value of the object side surface of the fourth lens is greater than -50.0 mm and less than 0 mm, the curvature radius value of the image side surface of the fourth lens is greater than -300.0 mm and less than -20.0 mm, and the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy 0.5<=R8 / (R7+R8)<1.0; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy 0.2<f / EPD2-f / EPD1<0.5. The application solves the problem that the optical imaging lens in the prior art cannot simultaneously have a variable aperture and high imaging performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging devices, in particular to an optical imaging lens. BACKGROUND

[0002] With the rapid development of smart phones and the continuous improvement of the parameter performance of image sensors, there is a trend of developing larger image surfaces and larger apertures for optical imaging lenses on flagship phones of mainstream phone manufacturers. Optical imaging lenses with variable apertures are gradually favored by many domestic phone manufacturers and consumers because they can simultaneously consider normal and dark state shooting effects.

[0003] For smart phone developers, optical imaging lenses with variable apertures are an effective means to improve the competitiveness of their phone products to meet different scene shooting. In the night or indoor dark environment, switching to a large aperture can ensure more effective light flux and signal-to-noise ratio to obtain better shooting effects. In the outdoor light sufficient environment, shooting with a small aperture can achieve higher lens resolving power and depth of field effects. However, the current optical imaging lenses that can realize variable apertures generally have poor color difference and spherical aberration performance, resulting in poor imaging performance and difficulty in meeting the high performance requirements of the market.

[0004] That is, the optical imaging lens in the prior art has the problem that variable aperture and high imaging performance are difficult to be considered simultaneously. SUMMARY

[0005] The main purpose of the present application is to provide an optical imaging lens to solve the problem that the optical imaging lens in the prior art has the problem that variable aperture and high imaging performance are difficult to be considered simultaneously.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an optical imaging lens is provided, which comprises, in order from the object side to the image side, a variable diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; wherein the effective focal length of the second lens is positive, and the effective focal length of the third lens is negative; the curvature radius value of the object side surface of the fourth lens is greater than -50.0 mm and less than 0 mm, the curvature radius value of the image side surface of the fourth lens is greater than -300.0 mm and less than -20.0 mm, and the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.5≤R8 / (R7+R8)<1.0; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: 0.2<f / EPD2-f / EPD1<0.5.

[0007] Further, a radius of curvature value of the object side surface of the seventh lens is greater than 0 mm, a radius of curvature value of the image side surface of the seventh lens is greater than 0 mm, and a radius of curvature R13 of the object side surface of the seventh lens and a radius of curvature R14 of the image side surface of the seventh lens satisfy: -1.0 < (R13-R14) / (R13+R14) < -0.5.

[0008] Further, an air separation of the seventh lens and the eighth lens on the optical axis is greater than 1.5 mm and less than 2.0 mm, and a central thickness CT7 of the seventh lens on the optical axis, a central thickness CT8 of the eighth lens on the optical axis, the air separation T78 of the seventh lens and the eighth lens on the optical axis, an effective focal length f7 of the seventh lens, and an effective focal length f8 of the eighth lens satisfy: 0.3 < (CT7+T78+CT8) / (f7+f8) < 0.8.

[0009] Further, a refractive index N1 of the first lens, a refractive index N2 of the second lens, a central thickness CT1 of the first lens on the optical axis, a central thickness CT2 of the second lens on the optical axis, an air separation T12 of the first lens and the second lens on the optical axis, and a combined focal length f12 of the first lens and the second lens satisfy: 4.5 < [(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2) < 5.2.

[0010] Further, an effective focal length f1 of the first lens satisfies: f1 > 0 mm, and the effective focal length f1 of the first lens, an effective focal length f2 of the second lens, a radius of curvature R1 of the object side surface of the first lens, a radius of curvature R2 of the image side surface of the first lens, a radius of curvature R3 of the object side surface of the second lens, and a radius of curvature R4 of the image side surface of the second lens satisfy: 1.6 < f1 / (R1+R2)+f2 / (R3+R4) < 2.6.

[0011] Further, a combined focal length f34 of the third lens and the fourth lens, a radius of curvature R7 of the object side surface of the fourth lens, an effective focal length f3 of the third lens, and a radius of curvature R6 of the image side surface of the third lens satisfy: -2.5 < f34 / R7+f3 / R6 < -0.7.

[0012] Further, a maximum effective radius DT52 of the image side surface of the fifth lens, a maximum effective radius DT61 of the object side surface of the sixth lens, a radius of curvature R10 of the image side surface of the fifth lens, and a radius of curvature R11 of the object side surface of the sixth lens satisfy: -0.5 < (DT52+DT61) / (R10+R11) < 0.

[0013] Further, a combined focal length f67 of the sixth lens and the seventh lens and an effective focal length f5 of the fifth lens satisfy: 0 < f67 / f5 < 0.5.

[0014] Further, a radius of curvature R15 of an object side surface of the eighth lens, a radius of curvature R16 of an image side surface of the eighth lens, a dispersion coefficient V7 of the seventh lens, a dispersion coefficient V8 of the eighth lens, and an air separation T78 of the seventh lens and the eighth lens on the optical axis satisfy: -0.5 < (R15-R16) / [(V7+V8) / 2*T78] < 0.

[0015] Further, an edge thickness ET7 of the seventh lens, an edge thickness ET8 of the eighth lens, an air separation T78 of the seventh lens and the eighth lens on the optical axis, and a combined focal length f78 of the seventh lens and the eighth lens satisfy: -0.5 < (ET7+ET8+T78) / f78 < 0.

[0016] Further, a dispersion coefficient V4 of the fourth lens, a dispersion coefficient V5 of the fifth lens, a maximum effective radius DT42 of an image side surface of the fourth lens, a maximum effective radius DT51 of an object side surface of the fifth lens, and an air separation T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0 < (V5-V4)*T45 / (DT42+DT51) < 0.5.

[0017] Further, an effective focal length f of the optical imaging lens and a half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: f*tan(Semi-FOV) > 7.6.

[0018] Further, an on-axis distance TTL from the object side surface of the first lens to an imaging surface of the optical imaging lens and a half of a diagonal length of an effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH < 1.3.

[0019] Further, a combined focal length f678 of the sixth lens, the seventh lens, and the eighth lens and a combined focal length f12345 of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens satisfy: -1.5 < f678 / f12345 < -0.5.

[0020] Further, an air separation T67 of the sixth lens and the seventh lens on the optical axis, an on-axis distance SAG62 from an intersection of an image side surface of the sixth lens and the optical axis to a vertex of an effective radius of the image side surface of the sixth lens, and an on-axis distance SAG71 from an intersection of an object side surface of the seventh lens and the optical axis to a vertex of an effective radius of the object side surface of the seventh lens satisfy: -0.5 < T67 / (SAG62+SAG71) < 0.

[0021] Further, an on-axis distance SAG81 between the intersection of the object side of the eighth lens and the optical axis and the effective radius vertex of the object side of the eighth lens, an on-axis distance SAG82 between the intersection of the image side of the eighth lens and the optical axis and the effective radius vertex of the image side of the eighth lens, and an effective focal length f8 of the eighth lens satisfy: 0.5 < (SAG81 + SAG82) / f8 < 1.0.

[0022] Further, a half of the diagonal length of the effective pixel area on the imaging plane ImgH, an entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens, and an entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: -9.1 < ImgH / (EPD2 - EPD1) < -8.0.

[0023] Further, a central thickness CT3 of the third lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT6 of the sixth lens on the optical axis, and a sum ∑AT of the air gaps on the optical axis between the adjacent two lenses among the first to eighth lenses satisfy: 0.3 < (CT3 + CT4 + CT5 + CT6) / ∑AT < 0.8.

[0024] Further, an effective focal length f5 of the fifth lens satisfies: f5 > 0 mm; an effective focal length f7 of the seventh lens satisfies: f7 > 0 mm; and an effective focal length f8 of the eighth lens satisfies: f8 < 0 mm.

[0025] Further, a curvature radius R1 of the object side of the first lens satisfies: R1 > 0 mm; a curvature radius R2 of the image side of the first lens satisfies: R2 > 0 mm; a curvature radius R3 of the object side of the second lens satisfies: R3 < 0 mm; a curvature radius R4 of the image side of the second lens satisfies: R4 > 0 mm; and a curvature radius R6 of the image side of the third lens satisfies: R6 > 0 mm.

[0026] Further, a curvature radius R10 of the image side of the fifth lens satisfies: R10 < 0 mm; a curvature radius R11 of the object side of the sixth lens satisfies: R11 > 0 mm; a curvature radius R12 of the image side of the sixth lens satisfies: R12 > 0 mm; a curvature radius R15 of the object side of the eighth lens satisfies: R15 < 0 mm; and a curvature radius R16 of the image side of the eighth lens satisfies: R16 < 0 mm.

[0027] According to another aspect of the present application, there is provided an optical imaging lens comprising, in order from the object side to the image side, a variable aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein the effective focal length of the second lens has a positive sign, and the effective focal length of the third lens has a negative sign; the fourth lens has a curvature radius value of the object side surface greater than -50.0 mm and less than 0 mm, a curvature radius value of the image side surface greater than -300.0 mm and less than -20.0 mm, and the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.5≤R8 / (R7+R8)<1.0; the half of the diagonal line length of the effective pixel area on the imaging surface ImgH, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens, and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: -9.1<ImgH / (EPD2-EPD1)<-8.0.

[0028] Further, the effective focal length f of the optical imaging lens, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens, and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: 0.2<f / EPD2-f / EPD1<0.5; the curvature radius value of the object side surface of the seventh lens is greater than 0 mm, the curvature radius value of the image side surface of the seventh lens is greater than 0 mm, and the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: -1.0<(R13-R14) / (R13+R14)<-0.5.

[0029] Further, the air separation of the seventh lens and the eighth lens on the optical axis is greater than 1.5 mm and less than 2.0 mm, and the center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, the air separation T78 of the seventh lens and the eighth lens on the optical axis, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: 0.3<(CT7+T78+CT8) / (f7+f8)<0.8.

[0030] Further, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the air separation T12 of the first lens and the second lens on the optical axis, and the combined focal length f12 of the first lens and the second lens satisfy: 4.5<[(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2)<5.2.

[0031] Further, the effective focal length f1 of the first lens satisfies: f1>0mm, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 1.6

[0032] Further, the combined focal length f34 of the third lens and the fourth lens, the curvature radius R7 of the object side of the fourth lens, the effective focal length f3 of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -2.5

[0033] Further, the maximum effective radius DT52 of the image side of the fifth lens, the maximum effective radius DT61 of the object side of the sixth lens, the curvature radius R10 of the image side of the fifth lens and the curvature radius R11 of the object side of the sixth lens satisfy: -0.5

[0034] Further, the combined focal length f67 of the sixth lens and the seventh lens and the effective focal length f5 of the fifth lens satisfy: 0

[0035] Further, the curvature radius R15 of the object side of the eighth lens, the curvature radius R16 of the image side of the eighth lens, the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens and the air separation T78 of the seventh lens and the eighth lens on the optical axis satisfy: -0.5

[0036] Further, the edge thickness ET7 of the seventh lens, the edge thickness ET8 of the eighth lens, the air separation T78 of the seventh lens and the eighth lens on the optical axis and the combined focal length f78 of the seventh lens and the eighth lens satisfy: -0.5

[0037] Further, the dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens, the maximum effective radius DT42 of the image side of the fourth lens, the maximum effective radius DT51 of the object side of the fifth lens and the air separation T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0

[0038] Further, the effective focal length f of the optical imaging lens and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: f*tan(Semi-FOV)>7.6.

[0039] Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens and a half of a diagonal length of an effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH<1.3.

[0040] Further, a combined focal length f678 of the sixth lens, the seventh lens and the eighth lens and a combined focal length f12345 of the first lens, the second lens, the third lens, the fourth lens and the fifth lens satisfy: -1.5<f678 / f12345<-0.5.

[0041] Further, an air separation T67 of the sixth lens and the seventh lens on the optical axis, an on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens and an on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis and the effective radius vertex of the object side surface of the seventh lens satisfy: -0.5<T67 / (SAG62+SAG71)<0.

[0042] Further, an on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis and the effective radius vertex of the object side surface of the eighth lens, an on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis and the effective radius vertex of the image side surface of the eighth lens and an effective focal length f8 of the eighth lens satisfy: 0.5<(SAG81+SAG82) / f8<1.0.

[0043] Further, a central thickness CT3 of the third lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT6 of the sixth lens on the optical axis and a sum ∑AT of the air separations between the adjacent two lenses among the first lens to the eighth lens on the optical axis satisfy: 0.3<(CT3+CT4+CT5+CT6) / ∑AT<0.8.

[0044] Further, an effective focal length f5 of the fifth lens satisfies: f5>0mm; an effective focal length f7 of the seventh lens satisfies: f7>0mm; an effective focal length f8 of the eighth lens satisfies: f8<0mm.

[0045] Further, a curvature radius R1 of the object side surface of the first lens satisfies: R1>0mm; a curvature radius R2 of the image side surface of the first lens satisfies: R2>0mm; a curvature radius R3 of the object side surface of the second lens satisfies: R3<0mm; a curvature radius R4 of the image side surface of the second lens satisfies: R4>0mm; a curvature radius R6 of the image side surface of the third lens satisfies: R6>0mm.

[0046] Further, a curvature radius R10 of an image side surface of the fifth lens satisfies: R10 < 0 mm; a curvature radius R11 of an object side surface of the sixth lens satisfies: R11 > 0 mm; a curvature radius R12 of an image side surface of the sixth lens satisfies: R12 > 0 mm; a curvature radius R15 of an object side surface of the eighth lens satisfies: R15 < 0 mm; and a curvature radius R16 of an image side surface of the eighth lens satisfies: R16 < 0 mm.

[0047] By using the technical scheme of the present application, the optical imaging lens comprises, in sequence from the object side to the image side, a variable diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; wherein the second lens has a positive effective focal length, and the third lens has a negative effective focal length; the fourth lens has a curvature radius value of the object side surface greater than -50.0 mm and less than 0 mm, a curvature radius value of the image side surface greater than -300.0 mm and less than -20.0 mm, and a curvature radius R7 of the object side surface of the fourth lens and a curvature radius R8 of the image side surface of the fourth lens satisfy: 0.5 ≤ R8 / (R7+R8) < 1.0; and the effective focal length f of the optical imaging lens, an entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens, and an entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: 0.2 < f / EPD2-f / EPD1 < 0.5.

[0048] By setting the variable diaphragm, the size of the diaphragm of the optical imaging lens of the present application is variable, that is, the size of the entrance pupil diameter is variable, so that the optical imaging lens of the present application can be adjusted for different shooting scenes. When in the dark environment at night or indoors, the optical imaging lens is switched to a large aperture state to ensure more effective light flux and signal-to-noise ratio to obtain better shooting effect; when in the environment with sufficient outdoor light, the optical imaging lens switched to small aperture shooting can realize higher lens resolving power and depth of field effect. By reasonably configuring the refractive power and curvature range of each lens, the performance of the optical system can be guaranteed while having the characteristics of high pixels, large aperture and easy processing. When R8 / (R7+R8) satisfies the above condition, it is beneficial to better correct the chromatic aberration and spherical aberration of the optical system, and improve the imaging performance under a large aperture. When f / EPD2-f / EPD1 satisfies the above condition, it is beneficial to obtain a larger aperture change range to meet the use requirements in different shooting scenes. In addition, the optical imaging lens of the present application has the characteristics of large image surface, variable aperture and high performance, and can better meet the needs of users. BRIEF DESCRIPTION OF DRAWINGS

[0049] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for a purpose of explanations and are not intended as improper limitations to the present application. In the drawings:

[0050] Figure 1 FIG. 1 shows a structure diagram of the optical imaging lens of Example One of the present application when the F-number FNO is 1.6;

[0051] Figure 2 FIG. 2 shows a structure diagram of the optical imaging lens of Example One of the present application when the F-number FNO is 2.0;

[0052] Figure 3 , Figure 5 and Figure 7 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 1 ;

[0053] Figure 4 , Figure 6 and Figure 8 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 2 ;

[0054] Figure 9 FIG. 5 shows a structure diagram of the optical imaging lens of Example Two of the present application when the F-number FNO is 1.6;

[0055] Figure 10 FIG. 6 shows a structure diagram of the optical imaging lens of Example Two of the present application when the F-number FNO is 2.0;

[0056] Figure 11 , Figure 13 and Figure 15 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 9 ;

[0057] Figure 12 , Figure 14 and Figure 16 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 10 ;

[0058] Figure 17 FIG. 9 shows a structure diagram of the optical imaging lens of Example Three of the present application when the F-number FNO is 1.6;

[0059] Figure 18 FIG. 10 shows a structure diagram of the optical imaging lens of Example Three of the present application when the F-number FNO is 2.0;

[0060] Figure 19 , Figure 21 and Figure 23 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 17The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens in the image;

[0061] Figure 20 , Figure 22 and Figure 24 They are shown respectively Figure 18 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens in the image;

[0062] Figure 25 A schematic diagram of the structure of the optical imaging lens of Example 4 of the present invention with an aperture value FNO of 1.6 is shown;

[0063] Figure 26 A schematic diagram of the structure of the optical imaging lens of Example 4 of the present invention with an aperture value FNO of 2.0 is shown;

[0064] Figure 27 , Figure 29 and Figure 31 They are shown respectively Figure 25 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens in the image;

[0065] Figure 28 , Figure 30 and Figure 32 They are shown respectively Figure 26 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens in the image;

[0066] Figure 33 A schematic diagram of the structure of the optical imaging lens of Example 5 of the present invention with an aperture value FNO of 1.6 is shown;

[0067] Figure 34 A schematic diagram of the structure of the optical imaging lens of Example 5 of the present invention with an aperture value FNO of 2.0 is shown;

[0068] Figure 35 , Figure 37 and Figure 39 They are shown respectively Figure 33 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens in the image;

[0069] Figure 36 , Figure 38 and Figure 40 They are shown respectively Figure 34 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens in the image;

[0070] Figure 41 A schematic diagram of the structure of the optical imaging lens of Example Six of the present invention with an aperture value FNO of 1.6 is shown;

[0071] Figure 42FIG. 6 shows a structure diagram of the optical imaging lens of Example 6 of the present application when the F-number FNO is 2.0;

[0072] Figure 43 , Figure 45 and Figure 47 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 41 ;

[0073] Figure 44 , Figure 46 and Figure 48 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 42 ;

[0074] Figure 49 FIG. 7 shows a structure diagram of the optical imaging lens of Example 7 of the present application when the F-number FNO is 1.6;

[0075] Figure 50 FIG. 8 shows a structure diagram of the optical imaging lens of Example 7 of the present application when the F-number FNO is 2.0;

[0076] Figure 51 , Figure 53 and Figure 55 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 49 ;

[0077] Figure 52 , Figure 54 and Figure 56 respectively show the on-axis chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens in Figure 50 .

[0078] In the above drawings, the following reference signs are used:

[0079] STO, variable diaphragm; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; E4, fourth lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; E5, fifth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; E6, sixth lens;

[0080] S11, object side surface of the sixth lens; S12, image side surface of the sixth lens; E7, seventh lens; S13, object side surface of the seventh lens;

[0081] S14, image side surface of the seventh lens; E8, eighth lens; S15, object side surface of the eighth lens; S16, image side surface of the eighth lens; E9, filter; S17, object side surface of the filter; S18, image side surface of the filter; S19, imaging surface. DETAILED DESCRIPTION

[0082] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict, unless otherwise specified. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0083] It should be noted that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0084] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0085] It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0086] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for the convenience of illustration. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0087] In this context, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side surface of the lens, and the surface of each lens near the image side is referred to as the image side surface of the lens. The judgment of the surface shape in the paraxial region can be made according to the judgment method of those skilled in the art, with the R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) positive or negative to judge the convexity or concavity. As for the object side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; as for the image side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0088] In order to solve the problem that the optical imaging lens in the prior art cannot simultaneously consider variable aperture and high imaging performance, the present application provides an optical imaging lens.

[0089] Embodiment one

[0090] As shown in Figures 1 to 56 the optical imaging lens sequentially comprises a variable diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object side to the image side; wherein the effective focal length of the second lens is positive in sign, and the effective focal length of the third lens is negative in sign; the curvature radius value of the object side surface of the fourth lens is greater than -50.0 mm and less than 0 mm, the curvature radius value of the image side surface of the fourth lens is greater than -300.0 mm and less than -20.0 mm, and the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.5≤R8 / (R7+R8)<1.0; the effective focal length f of the optical imaging lens, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: 0.2<f / EPD2-f / EPD1<0.5.

[0091] By setting the variable diaphragm, the size of the diaphragm of the optical imaging lens of the present application is variable, that is, the size of the entrance pupil diameter is variable, so that the optical imaging lens of the present application can be adjusted for different shooting scenes. When in the dark environment at night or indoors, the optical imaging lens is switched to a large aperture state to ensure more effective light flux and signal-to-noise ratio to obtain better shooting effect; when in the environment with sufficient outdoor light, the optical imaging lens switched to small aperture shooting can realize higher lens resolving power and depth of field effect. By reasonably configuring the refractive power and curvature range of each lens, the performance of the optical system can be guaranteed while having the characteristics of high pixels, large aperture and easy processing. When R8 / (R7+R8) satisfies the above condition formula, it is beneficial to better correct the chromatic aberration and spherical aberration of the optical system, and improve the imaging performance under large aperture. When f / EPD2-f / EPD1 satisfies the above condition formula, it is beneficial to obtain a larger aperture change range to meet the use requirements in different shooting scenes. In addition, the optical imaging lens of the present application has the characteristics of large image surface, variable aperture and high performance, and can better meet the needs of users.

[0092] Preferably, 0.50≤R8 / (R7+R8)≤0.92.

[0093] Preferably, 0.36≤f / EPD2-f / EPD1≤0.40.

[0094] In the embodiment, the radius of curvature value of the object side surface of the seventh lens is greater than 0 mm, the radius of curvature value of the image side surface of the seventh lens is greater than 0 mm, and the relationship between the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfies: -1.0 < (R13-R14) / (R13+R14) < -0.5. By controlling the relationship between the R values of the object and image sides of the seventh lens within a certain range, not only the processability of the seventh lens can be reasonably ensured, but also the contributions of the seventh lens to the spherical aberration and coma of the optical system are controlled, and the imaging quality is improved. Preferably, -0.63 <= (R13-R14) / (R13+R14) <= -0.56.

[0095] In the embodiment, the air separation of the seventh lens and the eighth lens on the optical axis is greater than 1.5 mm and less than 2.0 mm, and the central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, the air separation T78 of the seventh lens and the eighth lens on the optical axis, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0.3 < (CT7+T78+CT8) / (f7+f8) < 0.8. By constraining the air separation of the seventh lens and the eighth lens on the optical axis, the performance of the system field curvature can be reasonably controlled, and the aberration of the system out of the axis field is small. When (CT7+T78+CT8) / (f7+f8) satisfies the above relationship, the lens processability can be ensured, and the field curvature performance of the optical system is considered, so that the optical imaging lens has good imaging quality out of the axis. Preferably, 0.37 <= (CT7+T78+CT8) / (f7+f8) <= 0.73.

[0096] In the embodiment, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the air separation T12 of the first lens and the second lens on the optical axis, and the combined focal length f12 of the first lens and the second lens satisfy: 4.5 < [(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2) < 5.2. By constraining the refractive index, thickness, separation and combined focal length of the first lens and the second lens in the optical system within a reasonable range, the compactness of the optical system can be ensured, and the on-axis chromatic spherical aberration of the optical system is reduced, and the imaging effect of the optical imaging lens under large aperture is improved. Preferably, 4.56 <= [(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2) <= 5.03.

[0097] In the embodiment, the effective focal length f1 of the first lens satisfies: f1>0mm, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 1.6<f1 / (R1+R2)+f2 / (R3+R4)<2.6. By restricting the focal length and the curvature radius of the first lens and the second lens within a certain range, the field curvature contribution of each field of view can be controlled within a reasonable range. Preferably, 1.71≤f1 / (R1+R2)+f2 / (R3+R4)≤2.55.

[0098] In the embodiment, the combined focal length f34 of the third lens and the fourth lens, the curvature radius R7 of the object side of the fourth lens, the effective focal length f3 of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -2.5<f34 / R7+f3 / R6<-0.7. By restricting the focal length and the curvature radius of the third lens and the fourth lens within a certain range, the chromatic aberration and the field curvature contribution of each field of view can be controlled within a reasonable range, and the imaging quality is improved. Preferably, -2.03≤f34 / R7+f3 / R6≤-0.83.

[0099] In the embodiment, the maximum effective radius DT52 of the image side of the fifth lens, the maximum effective radius DT61 of the object side of the sixth lens, the curvature radius R10 of the image side of the fifth lens and the curvature radius R11 of the object side of the sixth lens satisfy: -0.5<(DT52+DT61) / (R10+R11)<0. By configuring the maximum effective radius and the curvature radius of the fifth lens and the sixth lens within a reasonable range, it is beneficial to control the aperture and the step difference of the lens, and it is beneficial to its molding and assembly, thereby meeting the processability and processability requirements. Preferably, -0.48≤(DT52+DT61) / (R10+R11)≤-0.12.

[0100] In the embodiment, the combined focal length f67 of the sixth lens and the seventh lens and the effective focal length f5 of the fifth lens satisfy: 0<f67 / f5<0.5. By restricting the ratio of the combined focal length of the sixth lens and the seventh lens and the effective focal length of the fifth lens, the contribution of the fifth lens to the system spherical aberration can be well controlled, and the third-order spherical aberration generated by the lens is compensated, so that the system has good imaging quality on the axis. Preferably, 0.21≤f67 / f5≤0.44.

[0101] In the embodiment, the radius of curvature R15 of the object side surface of the eighth lens, the radius of curvature R16 of the image side surface of the eighth lens, the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens and the air separation T78 of the seventh lens and the eighth lens on the optical axis satisfy: -0.5 < (R15-R16) / [(V7+V8) / 2*T78] < 0. By reasonably configuring the radius of curvature and the dispersion coefficient of the seventh lens and the eighth lens, when (R15-R16) / [(V7+V8) / 2*T78] satisfies the above conditional expression, the distortion and the chromatic aberration of the optical system can be effectively controlled within a reasonable range. Preferably, -0.19≤(R15-R16) / [(V7+V8) / 2*T78]≤-0.13.

[0102] In the embodiment, the edge thickness ET7 of the seventh lens, the edge thickness ET8 of the eighth lens, the air separation T78 of the seventh lens and the eighth lens on the optical axis and the combined focal length f78 of the seventh lens and the eighth lens satisfy: -0.5 < (ET7+ET8+T78) / f78 < 0. By restricting the ratio of the sum of the edge thickness and the air separation of the seventh lens and the eighth lens to the combined focal length, the contribution amount of the field curvature of each field of view can be controlled within a reasonable range, while facilitating the machining and process requirements of the lens. Preferably, -0.25≤(ET7+ET8+T78) / f78≤-0.09.

[0103] In the embodiment, the dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens, the maximum effective radius DT42 of the image side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens and the air separation T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0 < (V5-V4)*T45 / (DT42+DT51) < 0.5. By restricting the relationship between the dispersion coefficients, the air separation and the maximum effective radii of the fourth lens and the fifth lens within a reasonable range, it is beneficial to correct the on-axis chromatic aberration of the optical system, improve the on-axis imaging quality and meet the application requirements of the variable aperture. Preferably, 0.30≤(V5-V4)*T45 / (DT42+DT51)≤0.46.

[0104] In the embodiment, the effective focal length f of the optical imaging lens and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: f*tan(Semi-FOV) > 7.6. Satisfying this conditional expression is beneficial to obtain a larger effective image height and better image resolution effect. Preferably, 7.65≤f*tan(Semi-FOV)≤8.09.

[0105] In the embodiment, an on-axis distance TTL between the object side surface of the first lens to the imaging surface of the optical imaging lens and a half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfies: TTL / ImgH<1.3. Since the multi-piece number lens such as the eight-piece lens, the large number of pieces is not conducive to the thinness requirement of the optical imaging lens. By controlling the ratio of the total length TTL and the image height in the range of less than 1.3, the more thin design of the multi-piece number optical imaging lens is helpful to realize the large image surface characteristics while controlling the overall length of the optical system, which is helpful to compress the size of the optical module and realize the miniaturization. Preferably, TTL / ImgH≤1.25.

[0106] In the embodiment, a combined focal length f678 of the sixth lens, the seventh lens and the eighth lens and a combined focal length f12345 of the first lens, the second lens, the third lens, the fourth lens and the fifth lens satisfy: -1.5<f678 / f12345<-0.5. By reasonably configuring the effective focal length of each lens, the compactness of the optical system is ensured. Preferably, -1.09≤f678 / f12345≤-0.72.

[0107] In the embodiment, an air interval T67 of the sixth lens and the seventh lens on the optical axis, an on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens and an on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh lens satisfy: -0.5<T67 / (SAG62+SAG71)<0. By configuring the ratio of the air interval of the sixth lens and the seventh lens on the optical axis and the sum of the vertex height, the field curvature size of the optical system is controlled, and the lens tilt angle of the seventh lens is reduced to meet the processability requirement. Preferably, -0.39≤T67 / (SAG62+SAG71)≤-0.29.

[0108] In the embodiment, an on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis to the effective radius vertex of the object side surface of the eighth lens, an on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis to the effective radius vertex of the image side surface of the eighth lens and an effective focal length f8 of the eighth lens satisfy: 0.5<(SAG81+SAG82) / f8<1.0. By reasonably configuring the ratio range of the vertex height and the effective focal length of the eighth lens, the field curvature and the astigmatism of the off-axis field are reduced, and the thickness ratio of the lens is reduced to meet the molding requirement. Preferably, 0.63≤(SAG81+SAG82) / f8≤0.80.

[0109] In the embodiment, a half of a diagonal length of an effective pixel area on an imaging surface ImgH, an entrance pupil diameter EPD1 corresponding to a maximum entrance pupil of the optical imaging lens, and an entrance pupil diameter EPD2 corresponding to a minimum entrance pupil of the optical imaging lens satisfy: -9.1 < ImgH / (EPD2-EPD1) < -8.0. By restricting the ratio of the imaging surface size and the entrance pupil diameter of the optical system within a reasonable range, the image height of the optical system is increased, and better imaging effect is obtained. Preferably, -9.07 ≤ ImgH / (EPD2-EPD1) ≤ -8.25.

[0110] In the embodiment, a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a sum ∑AT of air gaps between adjacent two lenses among the first to eighth lenses on the optical axis satisfy: 0.3 < (CT3+CT4+CT5+CT6) / ∑AT < 0.8. By controlling the condition, the air gap of the optical imaging lens can be reasonably arranged, the gap sensitivity of the lens can be effectively reduced, and the field curvature can be corrected. Preferably, 0.55 < (CT3+CT4+CT5+CT6) / ∑AT < 0.57.

[0111] In the embodiment, an effective focal length f5 of the fifth lens satisfies: f5 > 0 mm; an effective focal length f7 of the seventh lens satisfies: f7 > 0 mm; and an effective focal length f8 of the eighth lens satisfies: f8 < 0 mm. By reasonably configuring the effective focal lengths of the fifth lens, the seventh lens, and the eighth lens, the field curvature of the system can be controlled within a certain range.

[0112] In the embodiment, a curvature radius R1 of an object side surface of the first lens satisfies: R1 > 0 mm; a curvature radius R2 of an image side surface of the first lens satisfies: R2 > 0 mm; a curvature radius R3 of an object side surface of the second lens satisfies: R3 < 0 mm; a curvature radius R4 of an image side surface of the second lens satisfies: R4 > 0 mm; and a curvature radius R6 of an image side surface of the third lens satisfies: R6 > 0 mm. By controlling the curvature radii of the first lens, the second lens, and the third lens, the sensitivity of the optical imaging lens can be controlled, and the processability and process requirements can be met.

[0113] In this embodiment, the radius of curvature R10 of the image-side surface of the fifth lens satisfies: R10 < 0 mm; the radius of curvature R11 of the object-side surface of the sixth lens satisfies: R11 > 0 mm; the radius of curvature R12 of the image-side surface of the sixth lens satisfies: R12 > 0 mm; the radius of curvature R15 of the object-side surface of the eighth lens satisfies: R15 < 0 mm; and the radius of curvature R16 of the image-side surface of the eighth lens satisfies: R16 < 0 mm. By controlling the radii of curvature of the fifth, sixth, and eighth lenses, it is beneficial to reduce the field curvature and peak sensitivity, thereby improving the assembly yield of the optical imaging lens.

[0114] Example 2

[0115] like Figures 1 to 56 As shown, the optical imaging lens, from the object side to the image side, includes a variable aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in that order. The effective focal length of the second lens is positive, and the effective focal length of the third lens is negative. The radius of curvature of the object side of the fourth lens is greater than -50.0 mm and less than 0 mm, and the radius of curvature of the image side of the fourth lens is greater than -300.0 mm and less than -20.0 mm. Furthermore, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy the condition: 0.5 ≤ R8 / (R7+R8) < 1.0. The distance between half the diagonal length of the effective pixel area ImgH on the imaging plane, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens, and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfies the condition: -9.1. <ImgH / (EPD2-EPD1)<-8.0。

[0116] By setting a variable aperture, the size of the aperture of the optical imaging lens in this application can be varied, meaning the entrance pupil diameter can be adjusted. This allows the optical imaging lens to adapt to different shooting scenarios. In low-light conditions such as at night or indoors, the optical imaging lens switches to a large aperture to ensure more effective light throughput and signal-to-noise ratio, resulting in better shooting effects. In well-lit outdoor environments, the optical imaging lens switches to a small aperture to achieve higher lens resolution and depth of field. By rationally configuring the optical power and curvature range of each lens, the optical system performance can be guaranteed while possessing high pixel count, large aperture, and ease of manufacturing. When R8 / (R7+R8) satisfies the above condition, it is beneficial to better correct chromatic aberration and spherical aberration of the optical system, improving imaging performance under large aperture conditions. By constraining the ratio of the imaging plane size to the entrance pupil diameter of the optical system within a reasonable range, it helps to increase the image height of the optical system and obtain better imaging effects.

[0117] Preferably, 0.50≤R8 / (R7+R8)≤0.92.

[0118] Preferably, -9.07≤ImgH / (EPD2-EPD1)≤-8.25.

[0119] In the embodiment, the effective focal length f of the optical imaging lens, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens, and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: 0.2<f / EPD2-f / EPD1<0.5. When f / EPD2-f / EPD1 satisfies the condition, a larger aperture variation range can be obtained to meet the use requirements in different shooting scenes. In addition, the optical imaging lens has the characteristics of large image surface, variable aperture, and high performance, and can better meet the needs of users. Preferably, 0.36≤f / EPD2-f / EPD1≤0.40.

[0120] In the embodiment, the radius of curvature value of the object side of the seventh lens is greater than 0 mm, the radius of curvature value of the image side of the seventh lens is greater than 0 mm, and the radius of curvature R13 of the object side of the seventh lens and the radius of curvature R14 of the image side of the seventh lens satisfy: -1.0<(R13-R14) / (R13+R14)<-0.5. By controlling the relationship between the R values of the object and image sides of the seventh lens within a certain range, not only the processability of the seventh lens can be reasonably ensured, but also the spherical aberration and coma contribution of the seventh lens to the optical system is controlled, and the imaging quality is improved. Preferably, -0.63≤(R13-R14) / (R13+R14)≤-0.56.

[0121] In the embodiment, the air gap of the seventh lens and the eighth lens on the optical axis is greater than 1.5 mm and less than 2.0 mm, and the center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, the air gap T78 of the seventh lens and the eighth lens on the optical axis, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: 0.3<(CT7+T78+CT8) / (f7+f8)<0.8. By restricting the air gap of the seventh lens and the eighth lens on the optical axis, the performance of the system field curvature can be reasonably controlled, and the aberration of the system in the off-axis field of view is small. When (CT7+T78+CT8) / (f7+f8) satisfies the above relationship, the processability of the lens can be ensured, and the field curvature performance of the optical system is considered, so that the optical imaging lens has good imaging quality off-axis. Preferably, 0.37≤(CT7+T78+CT8) / (f7+f8)≤0.73.

[0122] In the embodiment, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the air interval T12 of the first lens and the second lens on the optical axis, and the combined focal length f12 of the first lens and the second lens satisfy: 4.5<[(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2)<5.2. By restricting the refractive index, thickness, interval, combined focal length of the first lens and the second lens in the optical system within a reasonable range, the compactness of the optical system is guaranteed, and the on-axis chromatic aberration of the optical system is reduced, and the imaging effect of the optical imaging lens under a large aperture is improved. Preferably, 4.56≤[(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2)≤5.03.

[0123] In the embodiment, the effective focal length f1 of the first lens satisfies: f1>0mm, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, the curvature radius R3 of the object side of the second lens, and the curvature radius R4 of the image side of the second lens satisfy: 1.6<f1 / (R1+R2)+f2 / (R3+R4)<2.6. By restricting the focal length and the curvature radius of the first lens and the second lens within a certain range, the field curvature contribution of each field of view can be controlled within a reasonable range. Preferably, 1.71≤f1 / (R1+R2)+f2 / (R3+R4)≤2.55.

[0124] In the embodiment, the combined focal length f34 of the third lens and the fourth lens, the curvature radius R7 of the object side of the fourth lens, the effective focal length f3 of the third lens, and the curvature radius R6 of the image side of the third lens satisfy: -2.5<f34 / R7+f3 / R6<-0.7. By restricting the focal length and the curvature radius of the third lens and the fourth lens within a certain range, the chromatic aberration and the field curvature contribution of each field of view can be controlled within a reasonable range, and the imaging quality is improved. Preferably, -2.03≤f34 / R7+f3 / R6≤-0.83.

[0125] In the embodiment, the maximum effective radius DT52 of the image side of the fifth lens, the maximum effective radius DT61 of the object side of the sixth lens, the curvature radius R10 of the image side of the fifth lens and the curvature radius R11 of the object side of the sixth lens satisfy: -0.5 < (DT52 + DT61) / (R10 + R11) < 0. By configuring the maximum effective radius and the curvature radius of the fifth lens and the sixth lens within a reasonable range, the aperture and the step of the lens are controlled, the lens is beneficial to be molded and assembled, and the processability and the workability are met. Preferably, -0.48 ≤ (DT52 + DT61) / (R10 + R11) ≤ -0.12.

[0126] In the embodiment, the combined focal length f67 of the sixth lens and the seventh lens and the effective focal length f5 of the fifth lens satisfy: 0 < f67 / f5 < 0.5. By restricting the ratio of the combined focal length of the sixth lens and the seventh lens and the effective focal length of the fifth lens, the contribution of the fifth lens to the system spherical aberration can be well controlled, and the third-order spherical aberration generated by the lens is compensated, so that the system has good imaging quality on the axis. Preferably, 0.21 ≤ f67 / f5 ≤ 0.44.

[0127] In the embodiment, the curvature radius R15 of the object side of the eighth lens, the curvature radius R16 of the image side of the eighth lens, the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: -0.5 < (R15 - R16) / [(V7 + V8) / 2 * T78] < 0. By reasonably configuring the curvature radius and the dispersion coefficient of the seventh lens and the eighth lens, when (R15 - R16) / [(V7 + V8) / 2 * T78] satisfies the above condition, the distortion and the chromatic aberration of the optical system can be effectively controlled within a reasonable range. Preferably, -0.19 ≤ (R15 - R16) / [(V7 + V8) / 2 * T78] ≤ -0.13.

[0128] In the embodiment, the edge thickness ET7 of the seventh lens, the edge thickness ET8 of the eighth lens, the air interval T78 of the seventh lens and the eighth lens on the optical axis and the combined focal length f78 of the seventh lens and the eighth lens satisfy: -0.5 < (ET7 + ET8 + T78) / f78 < 0. By restricting the ratio of the sum of the edge thickness and the air interval of the seventh lens and the eighth lens and the combined focal length, the field curvature contribution of each field of view can be controlled within a reasonable range, and the processability and the workability of the lens are met. Preferably, -0.25 ≤ (ET7 + ET8 + T78) / f78 ≤ -0.09.

[0129] In the embodiment, the following conditions are met: 0 < (V5-V4)*T45 / (DT42+DT51) < 0.5, where V4 is the dispersion coefficient of the fourth lens, V5 is the dispersion coefficient of the fifth lens, DT42 is the maximum effective radius of the image side of the fourth lens, DT51 is the maximum effective radius of the object side of the fifth lens, and T45 is the air gap of the fourth lens and the fifth lens on the optical axis. By restricting the relationship among the dispersion coefficients, the air gap, and the maximum effective radii of the fourth lens and the fifth lens within a reasonable range, the on-axis chromatic aberration of the optical system is corrected, the on-axis imaging quality is improved, and the application requirement of the variable aperture is met. Preferably, 0.30 ≤ (V5-V4)*T45 / (DT42+DT51) ≤ 0.46.

[0130] In the embodiment, the following condition is met: f*tan(Semi-FOV) > 7.6, where f is the effective focal length of the optical imaging lens, and Semi-FOV is half of the maximum field angle of the optical imaging lens. By meeting the condition, a larger effective image height and better image resolution effect are obtained. Preferably, 7.65 ≤ f*tan(Semi-FOV) ≤ 8.09.

[0131] In the embodiment, the following condition is met: TTL / ImgH < 1.3, where TTL is the on-axis distance from the object side of the first lens to the imaging surface of the optical imaging lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface. Since the number of lenses is large, such as eight pieces, the large number of pieces is not conducive to the thinness requirement of the optical imaging lens. By controlling the ratio of the total length TTL and the image height within the range of less than 1.3, the thinness design of the multi-piece optical imaging lens is facilitated, the overall length of the optical system is controlled while the large image surface characteristic is achieved, the size of the optical module is compressed, and miniaturization is achieved. Preferably, TTL / ImgH ≤ 1.25.

[0132] In the embodiment, the following condition is met: -1.5 < f678 / f12345 < -0.5, where f678 is the combined focal length of the sixth lens, the seventh lens, and the eighth lens, and f12345 is the combined focal length of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens. By reasonably configuring the effective focal lengths of the lenses, the compactness of the optical system is ensured. Preferably, -1.09 ≤ f678 / f12345 ≤ -0.72.

[0133] In the embodiment, the air gap T67 of the sixth lens and the seventh lens on the optical axis, the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens, and the on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis and the effective radius vertex of the object side surface of the seventh lens satisfy: -0.5 < T67 / (SAG62+SAG71) < 0. By configuring the ratio of the air gap of the sixth lens and the seventh lens on the optical axis and the sum of the sagittal heights, the size of the field curvature of the optical system can be controlled, and the lens tilt angle of the seventh lens is reduced to meet the processability requirement. Preferably, -0.39 ≤ T67 / (SAG62+SAG71) ≤ -0.29.

[0134] In the embodiment, the on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis and the effective radius vertex of the object side surface of the eighth lens, the on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis and the effective radius vertex of the image side surface of the eighth lens, and the effective focal length f8 of the eighth lens satisfy: 0.5 < (SAG81+SAG82) / f8 < 1.0. By reasonably configuring the ratio range of the sagittal height of the eighth lens and the effective focal length, the field curvature and the astigmatism of the off-axis field of view are reduced, and the thickness ratio of the lens is reduced to meet the molding requirement. Preferably, 0.63 ≤ (SAG81+SAG82) / f8 ≤ 0.80.

[0135] In the embodiment, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT6 of the sixth lens on the optical axis, and the sum ∑AT of the air gaps between the adjacent two lenses among the first lens to the eighth lens on the optical axis satisfy: 0.3 < (CT3+CT4+CT5+CT6) / ∑AT < 0.8. By controlling the condition, the air gap of the optical imaging lens can be reasonably configured, the gap sensitivity of the lens can be effectively reduced, and the field curvature is corrected. Preferably, 0.55 < (CT3+CT4+CT5+CT6) / ∑AT < 0.57.

[0136] In the embodiment, the effective focal length f5 of the fifth lens satisfies: f5 > 0 mm; the effective focal length f7 of the seventh lens satisfies: f7 > 0 mm; and the effective focal length f8 of the eighth lens satisfies: f8 < 0 mm. By reasonably configuring the effective focal length of the fifth lens, the seventh lens, and the eighth lens, the field curvature of the system can be controlled within a certain range.

[0137] In the embodiment, the radius of curvature R1 of the object side surface of the first lens satisfies: R1 > 0 mm; the radius of curvature R2 of the image side surface of the first lens satisfies: R2 > 0 mm; the radius of curvature R3 of the object side surface of the second lens satisfies: R3 < 0 mm; the radius of curvature R4 of the image side surface of the second lens satisfies: R4 > 0 mm; and the radius of curvature R6 of the image side surface of the third lens satisfies: R6 > 0 mm. By controlling the radius of curvature of the first lens, the second lens and the third lens, the sensitivity of the optical imaging lens can be controlled, and the processability and process requirements can be met.

[0138] In the embodiment, the radius of curvature R10 of the image side surface of the fifth lens satisfies: R10 < 0 mm; the radius of curvature R11 of the object side surface of the sixth lens satisfies: R11 > 0 mm; the radius of curvature R12 of the image side surface of the sixth lens satisfies: R12 > 0 mm; the radius of curvature R15 of the object side surface of the eighth lens satisfies: R15 < 0 mm; and the radius of curvature R16 of the image side surface of the eighth lens satisfies: R16 < 0 mm. By controlling the radius of curvature of the fifth lens, the sixth lens and the eighth lens, the interval field curvature and the peak sensitivity can be reduced, and the assembly yield of the optical imaging lens can be improved.

[0139] Optionally, the optical imaging lens described above can further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0140] The optical imaging lens in the application can adopt multiple lenses, for example, eight lenses as described above. By reasonably allocating the optical power, surface shape, central thickness of each lens and the axial distance between each lens, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced and the processability of the lens can be improved, so that the optical imaging lens is more conducive to production and processing and can be applied to portable electronic devices such as smart phones.

[0141] In the application, at least one of the lens surfaces of each lens is a non-spherical lens surface. The non-spherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the non-spherical lens has better curvature radius characteristics and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After adopting the non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0142] Since the non-spherical surface is obtained by rotating the meridional surface around the optical axis for one revolution, the structure has rotational symmetry, and in an ideal optical system, the meridional surface and the sagittal surface can be well corrected. At the same time, due to its unique lens model, it can provide sufficient space for subsequent related adjustment, making the related structure and assembly process more flexible and not reducing the imaging quality too much.

[0143] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed in the present application, to obtain the various results and advantages described in the present specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens can also include other numbers of lenses.

[0144] The specific surface shapes and parameters of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0145] It should be noted that any one of the following examples one to seven is applicable to all embodiments of the present application.

[0146] Example one

[0147] As shown in FIG. 1, the optical imaging lens of example one of the present application is described. Figures 1 to 8 FIG. 2 shows a schematic diagram of the optical imaging lens structure when the aperture value FNO is 1.6. Figure 1 FIG. 3 shows a schematic diagram of the optical imaging lens structure when the aperture value FNO is 2.0. Figure 2 As shown in FIG. 4, the optical imaging lens of example two of the present application is described.

[0148] As shown in FIG. 5 and FIG. 6, the optical imaging lens sequentially includes a variable stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19 from the object side to the image side. Figure 1 Figure 2 As shown in FIG. 7, the optical imaging lens sequentially includes a variable stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19 from the object side to the image side.

[0149] ​The first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is convex. The third lens E3 has negative refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The fifth lens E5 has positive refractive power, the object side S9 of the fifth lens is concave, and the image side S10 of the fifth lens is convex. The sixth lens E6 has positive refractive power, the object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is convex. The seventh lens E7 has positive refractive power, the object side S13 of the seventh lens is concave, and the image side S14 of the seventh lens is convex. The eighth lens E8 has negative refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is convex. The filter E9 has the object side S17 of the filter and the image side S18 of the filter. Light from an object sequentially passes through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0150] In the example, the total effective focal length f of the optical imaging lens is 8.50 mm, the maximum half field of view Semi-FOV of the optical imaging lens is 43.6°, the total length TTL of the optical imaging lens is 10.16 mm, and the image height ImgH of the optical imaging lens is 8.25 mm.

[0151] Table 1 shows the basic structure parameter table of the optical imaging lens of example one, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0152]

[0153]

[0154] Table 1

[0155] In example one, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0156]

[0157] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1-S16 in Example 1.

[0158]

[0159]

[0160] Table 2

[0161] Figure 3 The on-axis chromatic aberration curve of the optical imaging lens in Example 1 with an aperture value of FNO 1.6 is shown. Figure 4 The on-axis chromatic aberration curve of the optical imaging lens with an aperture value of FNO 2.0 in Example 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 5 The astigmatism curve of the optical imaging lens in Example 1 with an aperture value of FNO 1.6 is shown. Figure 6 The astigmatism curve of the optical imaging lens with an aperture value of FNO 2.0 in Example 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curve of the optical imaging lens in Example 1 with an aperture value of FNO 1.6 is shown. Figure 8 The distortion curve of the optical imaging lens with an aperture value of FNO of 2.0 in Example 1 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0162] according to Figures 3 to 8 As can be seen, the optical imaging lens given in Example 1 can achieve good image quality.

[0163] Example 2

[0164] like Figures 9 to 16 As shown, an optical imaging lens of Example 2 of this application is described. Figure 9 A schematic diagram of the optical imaging lens structure with an aperture value of FNO 1.6 is shown. Figure 10 A schematic diagram of the optical imaging lens structure with an aperture value of FNO 2.0 is shown. For the sake of brevity, descriptions similar to those in Example 1 will be omitted in this example and the following examples.

[0165] like Figure 9 and Figure 10As shown, the optical imaging lens includes, in order from the object side to the image side, a variable aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

[0166] The first lens E1 has positive refractive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative refractive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has positive refractive power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has negative refractive power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has positive refractive power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object side surface S15 of the eighth lens is concave, and the image side surface S16 of the eighth lens is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from an object passes through the surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

[0167] In this example, the total effective focal length f of the optical imaging lens is 8.35 mm, the maximum half field of view Semi-FOV of the optical imaging lens is 43.6°, the total track length TTL of the optical imaging lens is 10.16 mm, and the image height ImgH of the optical imaging lens is 8.25 mm.

[0168] Table 3 shows a table of basic structure parameters of the optical imaging lens of Example Two, where the units of the radius of curvature, thickness / distance are millimeters (mm).

[0169]

[0170] Table 3

[0171] Table 4 shows the high-order term coefficients of the aspherical surfaces that can be used in Example Two, where each aspherical surface type can be defined by the formula (1) given in Example One above.

[0172] Face No. A4 A6 A8 A10 A12 A14 A16 S1 -8.8477E-02 -1.8969E-02 -3.1315E-03 -2.8628E-04 -2.0729E-04 -2.1063E-04 -6.9807E-05 S2 -3.5276E-01 3.7653E-02 4.3565E-03 -4.2167E-03 -9.7326E-04 -2.3319E-04 4.2047E-05 S3 -3.3581E-01 4.1150E-02 2.0662E-03 -5.6665E-03 -4.2105E-04 -2.7240E-05 1.9968E-05 S4 -1.5162E-01 8.2316E-03 -3.8545E-03 2.5888E-03 -8.2732E-04 -1.1332E-04 5.9234E-05 S5 8.8595E-03 2.7656E-02 6.5557E-05 3.6642E-03 -6.9154E-04 -6.1625E-05 5.0161E-05 S6 6.3249E-02 1.5297E-02 1.5800E-03 7.0911E-04 -9.9650E-05 2.9771E-05 2.0013E-05 S7 -2.1965E-01 -1.4391E-02 3.1358E-03 7.0560E-04 2.9791E-05 8.4246E-05 3.9465E-05 S8 -3.1072E-01 1.7923E-02 1.2353E-02 5.0852E-03 1.1119E-03 6.4072E-04 -5.5530E-05 S9 -3.5335E-01 2.1972E-02 2.5860E-03 7.3082E-03 2.1210E-03 5.8648E-04 -6.0016E-04 S10 -6.4462E-01 -1.9548E-02 -9.7756E-03 3.3605E-03 3.3861E-03 2.0761E-03 8.2754E-04 S11 -1.6043E+00 -1.1975E-02 1.8632E-03 9.3565E-03 -6.0040E-03 2.5651E-03 5.5180E-05 S12 -2.5090E+00 2.8292E-01 -4.0176E-02 -9.4585E-04 -2.1560E-02 1.3773E-02 -4.9926E-05 S13 -3.9474E+00 1.4918E-01 3.3432E-03 2.6510E-03 -1.9056E-02 8.1736E-03 2.9604E-03 S14 -2.2219E+00 4.1603E-01 4.9583E-02 -5.5603E-02 5.5823E-03 1.2663E-02 -3.9117E-03 S15 -1.6162E+00 1.4165E+00 -6.0736E-01 1.5313E-01 -9.1642E-03 4.7406E-03 -2.0145E-02 S16 -7.4658E+00 1.4149E+00 -4.2122E-01 2.3104E-01 -1.0025E-01 4.1554E-02 -3.0987E-02 Face No. A18 A20 A22 A24 A26 A28 A30 S1 8.1337E-06 3.0170E-05 1.3953E-05 6.8085E-06 3.0126E-06 2.3415E-06 -1.2515E-06 S2 1.4375E-04 5.3882E-05 -5.5531E-06 -6.6544E-06 -5.4661E-07 2.3490E-06 8.9168E-07 S3 1.2740E-04 2.6133E-05 -2.6769E-05 -8.2076E-06 -1.1714E-07 2.6678E-06 8.9151E-07 S4 -5.5663E-07 -4.8629E-05 -1.8182E-05 1.2599E-05 9.9547E-06 2.1993E-06 -9.4536E-07 S5 -5.7808E-06 -2.5394E-05 -2.0686E-05 -2.9580E-07 3.1754E-06 3.3722E-06 6.1757E-07 S6 3.3766E-06 4.3663E-06 -1.4704E-06 -1.7391E-06 -1.1491E-06 3.3903E-07 1.3648E-07 S7 1.7576E-05 -6.5410E-06 1.9515E-06 -3.7950E-06 1.9701E-07 -3.4637E-07 9.9721E-07 S8 -1.7427E-04 -1.1326E-04 -2.2975E-05 -9.6990E-06 -2.0351E-06 4.6290E-06 -3.1838E-06 S9 -4.8509E-04 -1.9013E-04 1.5310E-06 2.1838E-05 2.5381E-05 1.5066E-05 -3.7759E-06 S10 2.6606E-04 2.1001E-06 -4.9383E-05 -5.2582E-05 -3.7844E-05 -1.6948E-05 -8.1621E-06 S11 6.1930E-04 -2.1065E-04 1.5232E-04 -2.1984E-05 1.6736E-05 -1.9095E-05 3.7847E-06 S12 2.0228E-04 -1.4671E-03 6.5798E-04 -6.1814E-05 6.4152E-05 -7.7634E-05 2.2755E-05 S13 5.3787E-04 -2.2459E-03 -3.9574E-05 1.8474E-04 -5.1881E-05 -7.3315E-05 -2.7712E-05 S14 -2.0946E-03 5.5965E-04 1.4578E-03 -5.5656E-04 -2.7324E-04 1.2308E-04 -4.4213E-05 S15 1.5850E-02 -6.3917E-03 1.6963E-03 -1.1315E-03 1.0489E-03 -5.5696E-04 1.2023E-04 S16 1.5327E-02 -9.9595E-03 4.4894E-03 -4.0994E-03 1.2165E-03 -9.9874E-04 9.5443E-04

[0173] Table 4

[0174] Figure 11 An on-axis chromatic aberration curve of the optical imaging lens of Example Two is shown when the aperture value FNO is 1.6,Figure 12 The on-axis chromatic aberration curve of the optical imaging lens of Example Two with an FNO of 2.0 is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 13 The astigmatism curve of the optical imaging lens of Example Two with an FNO of 1.6 is shown, Figure 14 The astigmatism curve of the optical imaging lens of Example Two with an FNO of 2.0 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 15 The distortion curve of the optical imaging lens of Example Two with an FNO of 1.6 is shown, Figure 16 The distortion curve of the optical imaging lens of Example Two with an FNO of 2.0 is shown, which represents the distortion size values corresponding to different field angles.

[0175] According to Figures 11 to 16 It can be known that the optical imaging lens given in Example Two can achieve good imaging quality.

[0176] Example Three

[0177] As Figures 17 to 24 shown, the optical imaging lens of Example Three of the present application is described. Figure 17 A schematic diagram of the optical imaging lens structure with an FNO of 1.6 is shown. Figure 18 A schematic diagram of the optical imaging lens structure with an FNO of 2.0 is shown.

[0178] As Figure 17 and Figure 18 shown, the optical imaging lens sequentially includes a variable stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19 from the object side to the image side.

[0179] The first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The third lens E3 has negative refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has positive refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The fifth lens E5 has positive refractive power, the object side S9 of the fifth lens is concave, and the image side S10 of the fifth lens is convex. The sixth lens E6 has negative refractive power, the object side S11 of the sixth lens is convex, and the image side S12 of the sixth lens is concave. The seventh lens E7 has positive refractive power, the object side S13 of the seventh lens is convex, and the image side S14 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is concave. The filter E9 has the object side S17 and the image side S18 of the filter. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0180] In the present example, the total effective focal length f of the optical imaging lens is 8.35 mm, the maximum half field of view Semi-FOV of the optical imaging lens is 42.5°, the total track length TTL of the optical imaging lens is 10.16 mm, and the image height ImgH of the optical imaging lens is 8.25 mm.

[0181] Table 5 shows the basic structure parameter table of the optical imaging lens of Example Three, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0182]

[0183]

[0184] Table 5

[0185] Table 6 shows the high-order term coefficients of the aspherical surface that can be used in Example Three, wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0186] Face No. A4 A6 A8 A10 A12 A14 A16 S1 -1.3841E-01 -3.2694E-02 -5.0905E-03 1.2570E-04 3.8972E-04 4.3779E-04 4.3294E-04 S2 -4.1526E-01 4.6774E-02 -7.5596E-04 -7.8029E-03 5.0852E-05 1.2444E-03 8.1842E-04 S3 -4.2095E-01 4.0373E-02 -1.6008E-02 -1.4359E-02 -4.2853E-04 6.6669E-04 4.9337E-04 S4 -1.9856E-01 -1.5173E-03 -6.8909E-03 -2.8432E-04 -2.0882E-03 6.9190E-06 7.6796E-04 S5 5.3283E-02 4.0144E-02 6.5126E-03 3.4082E-03 -2.1534E-03 -8.6893E-04 -2.0266E-04 S6 9.4449E-02 2.3354E-02 4.7306E-03 1.3006E-03 -6.9537E-06 5.4640E-06 -5.2254E-05 S7 -2.5762E-01 -1.5665E-02 7.5701E-03 1.2620E-03 8.5547E-04 2.7556E-04 2.2923E-04 S8 -2.2489E-01 2.2023E-02 4.2837E-02 3.8305E-03 4.2372E-03 -2.0924E-03 -2.9036E-04 S9 -2.3671E-01 -6.0452E-03 2.7844E-02 3.7138E-04 3.3720E-03 -4.7638E-03 -9.9514E-04 S10 -7.3619E-01 -2.2029E-02 9.2608E-03 1.1976E-02 5.1565E-03 -2.3702E-03 -3.5523E-03 S11 -2.0936E+00 -8.3927E-03 3.1060E-02 2.4780E-03 -7.3412E-03 -6.8732E-04 -4.1673E-03 S12 -3.0258E+00 3.1578E-01 -7.5715E-02 -2.4013E-02 -7.0191E-03 1.9794E-02 -6.1975E-03 S13 -5.0558E+00 1.2614E-01 -6.9446E-02 -7.6291E-02 -6.3720E-02 -2.6571E-02 -3.5090E-02 S14 -2.5254E+00 6.4268E-01 3.6327E-04 -6.1427E-02 2.6237E-02 5.1803E-03 -1.3445E-02 S15 -1.7904E+00 1.5205E+00 -7.9782E-01 2.2922E-01 -6.6231E-02 -1.6487E-02 -1.9071E-02 S16 -8.5386E+00 1.6114E+00 -5.1459E-01 2.4011E-01 -1.4995E-01 3.0524E-02 -3.8335E-02 Face No. A18 A20 A22 A24 A26 A28 A30 S1 2.2852E-04 8.5379E-06 -1.0130E-04 -1.0532E-04 -7.3256E-05 -3.9624E-05 -1.3608E-05 S2 2.4134E-04 -1.2425E-04 -1.6074E-04 -9.1872E-05 -5.8501E-05 -3.2494E-05 -1.1449E-05 S3 4.1228E-04 1.9664E-04 1.5435E-04 1.0697E-04 1.6786E-05 -1.2860E-05 -5.9897E-06 S4 5.0677E-04 2.8803E-04 1.2497E-04 -4.2988E-05 -1.1075E-04 -5.5083E-05 -1.1141E-05 S5 -1.1284E-04 -1.0697E-05 4.1216E-05 2.7013E-05 -2.0758E-05 -2.1682E-05 -7.9221E-06 S6 -8.3961E-05 -5.3964E-05 -3.1913E-05 -6.3993E-06 1.8752E-06 3.3201E-06 9.2342E-08 S7 8.7629E-06 2.0559E-05 -3.2381E-06 1.7052E-06 -9.2310E-07 -9.9315E-07 -4.5252E-07 S8 -7.2342E-04 3.3548E-04 1.3476E-04 1.5387E-04 7.9491E-06 -2.5587E-06 -2.0839E-05 S9 -7.4935E-04 8.0764E-04 3.1722E-04 1.9442E-04 -5.9469E-05 -5.4936E-05 -4.4162E-05 S10 -2.4262E-03 -8.2253E-04 1.5274E-04 4.1873E-04 3.4170E-04 1.6207E-04 4.6245E-05 S11 -2.2610E-03 -8.5748E-04 7.0081E-04 6.9273E-04 6.1090E-04 2.9166E-04 1.1674E-04 S12 -3.0147E-03 -4.8217E-04 1.4788E-03 -3.0419E-04 -2.6216E-05 8.6059E-05 1.6990E-04 S13 -2.9063E-02 -1.6280E-02 -7.2462E-03 -5.8424E-03 -4.2038E-03 -1.8926E-03 -4.5720E-04 S14 3.8893E-04 4.0159E-03 -1.4168E-03 -2.2226E-03 9.1975E-04 9.0984E-04 6.0355E-05 S15 1.2155E-02 -1.0460E-02 1.4370E-03 8.7235E-04 1.0651E-03 -5.2319E-04 9.1362E-04 S16 1.2619E-02 -6.9135E-03 9.2882E-03 2.3071E-03 7.0638E-03 2.7071E-03 2.5370E-03

[0187] Figure 19 Figure 7 shows the axial chromatic aberration curve of the optical imaging lens of Example Three when the aperture value FNO is 1.6, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 20 Figure 8 shows the axial chromatic aberration curve of the optical imaging lens of Example Three when the aperture value FNO is 2.0, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 21The astigmatism curve of the optical imaging lens of Example Three is shown when the F-number FNO is 1.6, Figure 22 The astigmatism curve of the optical imaging lens of Example Three is shown when the F-number FNO is 2.0, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 23 The distortion curve of the optical imaging lens of Example Three is shown when the F-number FNO is 1.6, Figure 24 The distortion curve of the optical imaging lens of Example Three is shown when the F-number FNO is 2.0, which represents the distortion size values corresponding to different field angles.

[0188] According to Figures 19 to 24 It can be known that the optical imaging lens provided in Example Three can achieve good imaging quality.

[0189] Example Four

[0190] As shown in Figures 25 to 32 , the optical imaging lens of Example Four of the present application is described. Figure 25 A schematic diagram of the optical imaging lens structure is shown when the F-number FNO is 1.6. Figure 26 A schematic diagram of the optical imaging lens structure is shown when the F-number FNO is 2.0.

[0191] As shown in Figure 25 and Figure 26 , the optical imaging lens sequentially comprises, from the object side to the image side, a variable stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

[0192] The first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The third lens E3 has negative refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The fifth lens E5 has positive refractive power, the object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is convex. The sixth lens E6 has negative refractive power, the object side S11 of the sixth lens is convex, and the image side S12 of the sixth lens is concave. The seventh lens E7 has positive refractive power, the object side S13 of the seventh lens is convex, and the image side S14 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is concave. The filter E9 has the object side S17 and the image side S18 of the filter. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0193] In the present example, the total effective focal length f of the optical imaging lens is 8.35 mm, the maximum half field of view Semi-FOV of the optical imaging lens is 43.6°, the total track length TTL of the optical imaging lens is 10.16 mm, and the image height ImgH of the optical imaging lens is 8.25 mm.

[0194] Table 7 shows the basic structure parameter table of the optical imaging lens of Example Four, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0195]

[0196]

[0197] Table 7

[0198] Table 8 shows the high-order term coefficients of the aspherical surface that can be used in Example Four, wherein each aspherical surface type can be defined by the formula (1) given in Example One.

[0199]

[0200]

[0201] Table 8

[0202] Figure 27 The on-axis chromatic aberration curve of the optical imaging lens of Example Four is shown when the aperture value FNO is 1.6, Figure 28The axial chromatic aberration curve of the optical imaging lens of Example Four with an FNO of 2.0 is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 29 The astigmatism curve of the optical imaging lens of Example Four with an FNO of 1.6 is shown, Figure 30 The astigmatism curve of the optical imaging lens of Example Four with an FNO of 2.0 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 31 The distortion curve of the optical imaging lens of Example Four with an FNO of 1.6 is shown, Figure 32 The distortion curve of the optical imaging lens of Example Four with an FNO of 2.0 is shown, which represents the distortion size values corresponding to different field angles.

[0203] According to Figures 27 to 32 It can be known that the optical imaging lens provided in Example Four can achieve good imaging quality.

[0204] Example Five

[0205] As Figures 33 to 40 shown, the optical imaging lens of Example Five of the present application is described. Figure 33 A schematic diagram of the optical imaging lens structure with an FNO of 1.6 is shown. Figure 34 A schematic diagram of the optical imaging lens structure with an FNO of 2.0 is shown.

[0206] As Figure 33 and Figure 34 shown, the optical imaging lens sequentially includes a variable stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19 from the object side to the image side.

[0207] The first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The third lens E3 has negative refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The fifth lens E5 has positive refractive power, the object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is convex. The sixth lens E6 has negative refractive power, the object side S11 of the sixth lens is convex, and the image side S12 of the sixth lens is concave. The seventh lens E7 has positive refractive power, the object side S13 of the seventh lens is convex, and the image side S14 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is concave. The filter E9 has the object side S17 and the image side S18 of the filter. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0208] In the present example, the total effective focal length f of the optical imaging lens is 8.35 mm, the maximum half field of view Semi-FOV of the optical imaging lens is 43.6°, the total track length TTL of the optical imaging lens is 10.16 mm, and the image height ImgH of the optical imaging lens is 8.25 mm.

[0209] Table 9 shows the basic structure parameter table of the optical imaging lens of Example Five, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0210]

[0211] Table 9

[0212] Table 10 shows the high-order term coefficients of the aspherical surface that can be used in Example Five, wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0213]

[0214]

[0215] Table 10

[0216] Figure 35 shows the axial chromatic aberration curve of the optical imaging lens of Example Five when the aperture value FNO is 1.6, Figure 36 shows the axial chromatic aberration curve of the optical imaging lens of Example Five when the aperture value FNO is 2.0, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens.Figure 37 The astigmatism curve of the optical imaging lens of Example Five is shown when the F-number FNO is 1.6, Figure 38 The astigmatism curve of the optical imaging lens of Example Five is shown when the F-number FNO is 2.0, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 39 The distortion curve of the optical imaging lens of Example Five is shown when the F-number FNO is 1.6, Figure 40 The distortion curve of the optical imaging lens of Example Five is shown when the F-number FNO is 2.0, which represents the distortion size values corresponding to different field angles.

[0217] According to Figures 35 to 40 It can be known that the optical imaging lens provided in Example Five can achieve good imaging quality.

[0218] Example Six

[0219] As shown in Figures 41 to 48 The optical imaging lens of Example Six of the present application is described. Figure 41 A schematic diagram of the optical imaging lens structure is shown when the F-number FNO is 1.6. Figure 42 A schematic diagram of the optical imaging lens structure is shown when the F-number FNO is 2.0.

[0220] As shown in Figure 41 and Figure 42 The optical imaging lens comprises, in order from the object side to the image side, a variable stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

[0221] The first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The third lens E3 has negative refractive power, the object side S5 of the third lens is concave, and the image side S6 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The fifth lens E5 has positive refractive power, the object side S9 of the fifth lens is concave, and the image side S10 of the fifth lens is convex. The sixth lens E6 has positive refractive power, the object side S11 of the sixth lens is convex, and the image side S12 of the sixth lens is concave. The seventh lens E7 has positive refractive power, the object side S13 of the seventh lens is convex, and the image side S14 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is concave. The filter E9 has the object side S17 and the image side S18 of the filter. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0222] In the present example, the total effective focal length f of the optical imaging lens is 8.36 mm, the maximum half field of view Semi-FOV of the optical imaging lens is 43.6°, the total track length TTL of the optical imaging lens is 10.16 mm, and the image height ImgH of the optical imaging lens is 8.25 mm.

[0223] Table 11 shows the basic structure parameter table of the optical imaging lens of Example Six, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0224]

[0225] Table 11

[0226] Table 12 shows the high-order term coefficients of the aspherical surface that can be used in Example Six, wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0227] Face No. A4 A6 A8 A10 A12 A14 A16 S1 -8.7927E-02 -2.1269E-02 -3.9501E-03 -1.5779E-04 8.2731E-06 -1.1587E-04 -8.6352E-05 S2 -3.3196E-01 2.8442E-02 6.2851E-03 -2.9763E-03 -6.6609E-04 -2.0398E-04 -6.5087E-05 S3 -3.1408E-01 3.6253E-02 1.1163E-04 -6.2698E-03 -2.8445E-04 1.0050E-04 -5.3626E-05 S4 -1.7107E-01 9.3382E-03 -5.4936E-03 2.0123E-03 -7.1065E-05 -5.2568E-04 -2.2877E-04 S5 1.2898E-02 2.5864E-02 3.0798E-03 4.3934E-03 -3.6899E-04 -2.5411E-04 -2.6914E-04 S6 6.4254E-02 1.0716E-02 2.1224E-03 1.1345E-03 -1.3743E-04 1.1377E-04 1.3125E-05 S7 -2.2257E-01 -1.3839E-02 3.1237E-03 8.9234E-04 1.8017E-04 1.3488E-04 1.0859E-04 S8 -2.4087E-01 5.0152E-03 1.9383E-02 3.3450E-03 2.4452E-03 -2.9885E-06 3.0256E-04 S9 -2.5324E-01 -1.2065E-02 1.0169E-02 3.0037E-03 3.8299E-03 -1.7734E-04 1.3612E-04 S10 -5.7187E-01 -1.6761E-02 -1.7792E-03 4.9346E-03 4.1106E-03 1.4157E-03 4.7519E-04 S11 -1.6689E+00 -3.1610E-02 1.7885E-02 2.6366E-03 -3.1551E-03 7.4748E-04 8.2993E-04 S12 -2.1592E+00 1.9656E-01 -2.7986E-03 -2.4282E-02 -1.1421E-02 1.1120E-02 2.5121E-03 S13 -3.3161E+00 1.9048E-01 8.6409E-02 -4.2693E-03 -1.1234E-02 1.5173E-02 3.5783E-03 S14 -2.1134E+00 4.3292E-01 5.1627E-02 -6.6905E-02 1.5004E-02 1.5024E-02 -1.0789E-02 S15 -5.3629E-01 1.2762E+00 -5.6145E-01 1.5261E-01 -1.3948E-02 7.6287E-03 -2.2252E-02 S16 -6.8395E+00 1.2187E+00 -3.7698E-01 2.2048E-01 -9.6245E-02 4.5828E-02 -3.3207E-02 Face No. A18 A20 A22 A24 A26 A28 A30 S1 -6.3398E-06 1.9917E-05 1.7002E-05 1.2601E-05 1.4520E-05 1.1202E-05 5.0557E-06 S2 1.1602E-04 6.7183E-05 -3.4069E-06 -1.2321E-05 -1.6868E-07 3.7113E-06 1.1748E-06 S3 1.5764E-04 7.0600E-05 -3.5631E-05 -3.5197E-05 -1.5046E-05 -3.4487E-06 8.4659E-07 S4 2.7117E-04 3.8094E-05 -9.0034E-05 -9.7957E-06 1.3049E-05 8.6458E-06 -4.0788E-06 S5 1.1710E-04 4.3588E-05 -3.6020E-05 -1.0949E-05 2.0062E-06 6.1816E-06 1.7016E-06 S6 9.3683E-06 3.5406E-06 -3.5104E-06 -1.8211E-06 -1.1749E-06 4.9870E-07 5.6645E-08 S7 3.7158E-06 -2.6364E-06 -3.9179E-06 -6.6403E-07 3.3929E-07 -1.3221E-06 -4.6389E-07 S8 -5.0316E-04 -3.3301E-05 -7.1143E-05 2.2126E-05 -2.4139E-06 9.5025E-06 -1.7963E-06 S9 -8.1993E-04 -3.7934E-05 -8.9544E-05 4.8139E-05 7.2971E-06 1.7939E-05 -1.9013E-06 S10 -6.3778E-05 -1.2356E-04 -7.4439E-05 -4.3394E-05 -1.3030E-05 -5.4307E-06 -1.9871E-07 S11 2.9076E-04 -2.7963E-04 -1.3325E-05 -1.4395E-04 -1.0963E-04 -5.8119E-05 1.6536E-05 S12 -1.1163E-03 -1.5374E-03 4.6718E-04 -3.7647E-05 -7.7326E-05 -2.2840E-05 6.2179E-05 S13 -1.5569E-03 -3.8362E-03 -3.5850E-04 1.1057E-03 3.7626E-04 -1.7014E-04 -8.6009E-05 S14 -4.2136E-04 1.0893E-03 1.7371E-03 -3.0164E-04 -6.3870E-04 5.8042E-05 6.7772E-05 S15 1.8888E-02 -9.9978E-03 4.4909E-03 -2.6879E-03 1.6635E-03 -6.9832E-04 1.0249E-04 S16 1.8310E-02 -1.3609E-02 7.8792E-03 -6.0164E-03 1.2828E-03 -1.3069E-03 1.1001E-03

[0228] Table 12

[0229] Figure 43 The on-axis chromatic aberration curve of the optical imaging lens of Example Six is shown when the aperture value FNO is 1.6, Figure 44 The on-axis chromatic aberration curve of the optical imaging lens of Example Six is shown when the aperture value FNO is 2.0, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Figure 45 The astigmatism curve of the optical imaging lens of Example Six is shown when the aperture value FNO is 1.6,Figure 46 The astigmatism curve of the optical imaging lens of example six with FNO of 2.0 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 47 The distortion curve of the optical imaging lens of example six with FNO of 1.6 is shown, Figure 48 The distortion curve of the optical imaging lens of example six with FNO of 2.0 is shown, which represents the distortion size value corresponding to different field angles.

[0230] According to Figures 43 to 48 It can be known that the optical imaging lens provided in example six can achieve good imaging quality.

[0231] Example seven

[0232] As shown in Figures 49 to 56 The optical imaging lens of example seven of the present application is described. Figure 49 The schematic diagram of the optical imaging lens structure with FNO of 1.6 is shown. Figure 50 The schematic diagram of the optical imaging lens structure with FNO of 2.0 is shown.

[0233] As shown in Figure 49 and Figure 50 The optical imaging lens sequentially comprises a variable stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19 from the object side to the image side.

[0234] The first lens E1 has positive refractive power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has positive refractive power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The third lens E3 has negative refractive power, the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The fourth lens E4 has negative refractive power, the object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface. The fifth lens E5 has positive refractive power, the object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has positive refractive power, the object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The seventh lens E7 has positive refractive power, the object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The eighth lens E8 has negative refractive power, the object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through each surface S1 to S18 and is finally imaged on the imaging surface S19.

[0235] In this example, the total effective focal length f of the optical imaging lens is 8.51 mm, the maximum semi-FOV of the optical imaging lens is 43.1°, the total length TTL of the optical imaging lens is 10.30 mm, and the image height ImgH of the optical imaging lens is 8.25 mm.

[0236] Table 13 shows the basic structural parameters of the optical imaging lens of Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0237]

[0238]

[0239] Table 14 shows the higher-order coefficients that can be used for each aspherical mirror in Example 7, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0240] Face No. A4 A6 A8 A10 A12 A14 A16 S1 -9.1551E-02 -1.8219E-02 -4.4373E-03 -1.5843E-03 -6.8866E-04 -1.0589E-04 1.4188E-04 S2 -2.4658E-01 4.1849E-02 1.1401E-04 -7.2887E-03 -2.3489E-03 2.3935E-04 9.6856E-04 S3 -3.3723E-01 4.8311E-02 -9.3755E-04 -7.5604E-03 -1.4686E-03 2.4573E-04 8.1323E-04 S4 -1.8869E-01 1.5705E-02 -3.0837E-03 1.2606E-03 -1.0330E-03 1.4017E-04 7.9017E-05 S5 7.0880E-03 2.5359E-02 1.3532E-03 2.5311E-03 -9.4427E-04 6.3458E-05 -5.4288E-07 S6 6.6489E-02 1.3576E-02 2.0797E-03 7.5145E-04 -9.8087E-05 3.5546E-05 1.3034E-05 S7 -2.1410E-01 -1.4169E-02 3.3034E-03 6.5993E-04 1.5571E-04 2.8768E-05 6.2465E-05 S8 -2.6461E-01 -2.5903E-03 1.6228E-02 1.7993E-03 2.1250E-03 -4.2664E-04 3.2481E-04 S9 -2.7208E-01 1.3612E-02 1.9680E-02 6.1197E-03 4.4722E-03 -1.4912E-03 -3.2755E-04 S10 -6.1781E-01 -1.8922E-02 3.1203E-03 9.1712E-03 9.1266E-03 4.5801E-03 2.3998E-03 S11 -1.3224E+00 -7.7015E-02 1.8517E-03 5.6883E-03 2.3309E-03 3.4989E-03 2.6200E-03 S12 -1.7904E+00 1.7553E-01 1.3655E-02 1.3653E-04 -1.1662E-02 3.4796E-03 1.8443E-03 S13 -3.1328E+00 9.3323E-02 5.1464E-02 1.6888E-02 -1.0514E-02 -2.7215E-03 2.6705E-03 S14 -1.9060E+00 2.9508E-01 4.6048E-02 -5.3338E-02 6.8458E-04 9.7622E-03 2.5056E-03 S15 -8.2172E-01 1.1907E+00 -5.2443E-01 1.3738E-01 -6.5562E-03 -1.4254E-04 -9.7576E-03 S16 -6.6327E+00 1.2073E+00 -3.5577E-01 1.9480E-01 -7.3894E-02 3.0177E-02 -1.8284E-02 Face No. A18 A20 A22 A24 A26 A28 A30 S1 1.4675E-04 6.1572E-05 -4.2714E-06 -1.5602E-05 -3.9914E-06 2.3234E-06 6.8402E-07 S2 6.5076E-04 1.2636E-04 -1.0467E-04 -9.1226E-05 -2.4992E-05 4.4505E-06 6.8003E-06 S3 5.4168E-04 7.3434E-05 -1.1244E-04 -7.0303E-05 -2.0920E-05 3.5556E-06 2.0476E-06 S4 5.0941E-05 -5.9567E-05 -2.6281E-05 4.7789E-06 6.0923E-06 -9.8340E-07 -1.3727E-06 S5 6.9475E-06 -3.0183E-05 -2.0875E-05 -2.8537E-07 5.6482E-06 2.5102E-06 2.3342E-06 S6 3.4518E-06 5.1123E-06 -1.7850E-06 -2.2861E-06 -2.1636E-06 1.1041E-06 0.0000E+00 S7 -2.6466E-06 6.3315E-06 -5.5905E-06 3.3957E-07 -1.8945E-06 6.1054E-07 -4.4600E-07 S8 -4.2038E-04 8.1561E-06 -1.0755E-04 1.8733E-05 -1.8433E-05 1.4575E-05 -3.7410E-06 S9 -9.8802E-04 1.5934E-04 -1.6192E-05 1.5196E-04 2.1381E-06 1.8432E-05 -2.7278E-05 S10 7.3489E-04 1.5133E-04 -1.2310E-04 -1.4162E-04 -1.2101E-04 -6.1979E-05 -2.8774E-05 S11 9.1350E-04 4.7674E-05 -2.0277E-04 -1.4700E-04 -8.2032E-05 -2.6157E-05 -1.6442E-05 S12 -3.6673E-04 -7.8005E-04 -8.6091E-05 1.4055E-04 9.6210E-05 -1.4890E-05 -2.3976E-05 S13 7.3321E-04 -1.0486E-03 -1.8397E-04 1.4957E-04 1.4359E-04 4.0875E-05 -2.0815E-05 S14 -4.1558E-03 -1.7509E-04 1.5148E-03 -3.4734E-04 -1.1384E-04 -4.5087E-05 5.6396E-05 S15 6.3548E-03 -7.5792E-04 -2.9233E-04 -8.1568E-04 1.0310E-03 -4.6505E-04 7.8138E-05 S16 8.1269E-03 -4.2634E-03 3.4101E-03 -2.1869E-03 5.9525E-04 -6.3411E-04 2.9966E-04

[0241] Figure 51 The on-axis chromatic aberration curve of the optical imaging lens in Example 7 with an aperture value of FNO 1.6 is shown. Figure 52 The on-axis chromatic aberration curve of the optical imaging lens with an aperture value of FNO 2.0 in Example 7 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 53 The astigmatism curve of the optical imaging lens in Example 7 with an aperture value of FNO of 1.6 is shown. Figure 54 The astigmatism curve of the optical imaging lens with an aperture value of FNO 2.0 in Example 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 55 The distortion curve of the optical imaging lens in Example 7 with an aperture value of FNO of 1.6 is shown. Figure 56 The distortion curve of the optical imaging lens in Example 7 with an aperture value of FNO 2.0 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0242] according to Figures 51 to 56 As can be seen, the optical imaging lens given in Example 7 can achieve good imaging quality.

[0243] In summary, Examples 1 through 7 satisfy the relationships shown in Table 15.

[0244] Conditional Expression / Example 1 2 3 4 5 6 7 R8 / (R7+R8) 0.63 0.77 0.50 0.92 0.92 0.52 0.63 f / EPD2-f / EPD1 0.40 0.36 0.36 0.38 0.38 0.36 0.39 (R13-R14) / (R13+R14) -0.62 -0.56 -0.58 -0.62 -0.59 -0.63 -0.61 (CT7+T78+CT8) / (f7+f8) 0.37 0.66 0.73 0.67 0.65 0.44 0.62 [(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2) 5.03 4.99 4.82 4.99 4.91 4.56 4.65 f1 / (R1+R2)+f2 / (R3+R4) 2.55 2.28 2.18 2.35 2.33 1.96 1.71 f34 / R7+f3 / R6 -1.90 -1.88 -1.53 -2.03 -2.03 -0.83 -1.76 (DT52+DT61) / (R10+R11) -0.36 -0.44 -0.48 -0.20 -0.12 -0.35 -0.12 f67 / f5 0.31 0.44 0.24 0.39 0.38 0.25 0.21 (R15-R16) / [(V7+V8) / 2*T78] -0.13 -0.17 -0.19 -0.16 -0.17 -0.14 -0.16 (ET7+ET8+T78) / f78 -0.25 -0.11 -0.09 -0.11 -0.12 -0.19 -0.14 (V5-V4)*T45 / (DT42+DT51) 0.37 0.46 0.39 0.32 0.30 0.31 0.30 TTL / ImgH 1.23 1.23 1.23 1.23 1.23 1.23 1.25 f*tan(Semi-FOV) 8.09 7.95 7.65 7.95 7.95 7.96 7.95 f678 / f12345 -0.77 -0.91 -0.89 -1.09 -1.05 -0.72 -0.76 T67 / (SAG62+SAG71) -0.37 -0.29 -0.33 -0.36 -0.35 -0.39 -0.37 (SAG81+SAG82) / f8 0.80 0.68 0.65 0.64 0.64 0.73 0.63 ImgH / (EPD2-EPD1) -8.25 -8.97 -9.07 -8.25 -8.25 -9.07 -8.17 (CT3+CT4+CT5+CT6) / ∑AT 0.55 0.56 0.56 0.55 0.56 0.55 0.57

[0245] Table 15

[0246] Table 16 gives the effective focal length f of the optical imaging lenses for Examples 1 to 7, with each lens having an effective focal length f1 to f8.

[0247]

[0248]

[0249] Table 16

[0250] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0251] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0252] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0253] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0254] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that, From the object side to the image side, sequentially comprises variable aperture, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens; The total number of lenses with optical power in the optical imaging lens is eight; Wherein, the effective focal length of the first lens is positive, the effective focal length of the second lens is positive, the effective focal length of the third lens is negative, the effective focal length of the fifth lens is positive, the effective focal length of the seventh lens is positive, and the effective focal length of the eighth lens is negative; The sign of at least one of the effective focal length of the fourth lens and the effective focal length of the sixth lens is negative. 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; The image side of the third lens is concave; The object side of the fourth lens is concave, and the image side is convex; The image side of the fifth lens is convex; The object side of the sixth lens is convex, and the image side is concave; The object side of the seventh lens is convex, and the image side is concave; The object side of the eighth lens is concave, and the image side is concave; The curvature radius value of the object side of the fourth lens is greater than-50.0mm and less than 0mm, the curvature radius value of the image side of the fourth lens is greater than-300.0mm and less than-20.0mm, and the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 0.5≤R8 / (R7+R8)≤0.92; The half of the diagonal line length of the effective pixel area on the imaging surface ImgH, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: -9.07≤ImgH / (EPD2-EPD1)≤-8.

17. 2.The optical imaging lens according to claim 1, wherein, The effective focal length f of the optical imaging lens, the entrance pupil diameter EPD1 corresponding to the maximum entrance pupil of the optical imaging lens and the entrance pupil diameter EPD2 corresponding to the minimum entrance pupil of the optical imaging lens satisfy: 0.36≤f / EPD2-f / EPD1≤0.39; The curvature radius value of the object side of the seventh lens is greater than 0mm, the curvature radius value of the image side of the seventh lens is greater than 0mm, and the curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: -0.63≤(R13-R14) / (R13+R14)≤-0.

56. 3.The optical imaging lens according to claim 1, wherein, The air gap of the seventh lens and the eighth lens on the optical axis is greater than 1.5mm and less than 2.0mm, and the center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, the air gap T78 of the seventh lens and the eighth lens on the optical axis, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0.44≤(CT7+T78+CT8) / (f7+f8)≤0.

73. 4.The optical imaging lens according to claim 1, wherein, The refractive index N1 of the first lens, the refractive index N2 of the second lens, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the air interval T12 of the first lens and the second lens on the optical axis, and the combined focal length f12 of the first lens and the second lens satisfy: 4.56 ≤ [(N1-1)+(N2-1)]*f12 / (CT1+T12+CT2) ≤ 4.

99.

5. The optical imaging lens according to claim 1, characterized in that, The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 1.71 ≤ f1 / (R1+R2)+f2 / (R3+R4) ≤ 2.

35. 6.The optical imaging lens according to claim 1, wherein, The combined focal length f34 of the third lens and the fourth lens, the curvature radius R7 of the object side surface of the fourth lens, the effective focal length f3 of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy: -2.03 ≤ f34 / R7+f3 / R6 ≤ -0.

83. 7.The optical imaging lens according to claim 1, wherein, The maximum effective radius DT52 of the image side surface of the fifth lens, the maximum effective radius DT61 of the object side surface of the sixth lens, the curvature radius R10 of the image side surface of the fifth lens, and the curvature radius R11 of the object side surface of the sixth lens satisfy: -0.48 ≤ (DT52+DT61) / (R10+R11) ≤ -0.

12. 8.The optical imaging lens according to claim 1, wherein, The combined focal length f67 of the sixth lens and the seventh lens, and the effective focal length f5 of the fifth lens satisfy: 0.21 ≤ f67 / f5 ≤ 0.

44. 9.The optical imaging lens according to claim 1, wherein, The curvature radius R15 of the object side surface of the eighth lens, the curvature radius R16 of the image side surface of the eighth lens, the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: -0.19 ≤ (R15-R16) / [(V7+V8) / 2*T78] ≤ -0.

14. 10.The optical imaging lens according to claim 1, wherein, The edge thickness ET7 of the seventh lens, the edge thickness ET8 of the eighth lens, the air interval T78 of the seventh lens and the eighth lens on the optical axis, and the combined focal length f78 of the seventh lens and the eighth lens satisfy: -0.19 ≤ (ET7+ET8+T78) / f78 ≤ -0.

09. 11.The optical imaging lens according to claim 1, wherein, The dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens, the maximum effective radius DT42 of the image side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens, and the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.30 ≤ (V5-V4)*T45 / (DT42+DT51) ≤ 0.

46. 12.The optical imaging lens according to claim 1, wherein, A relationship between an effective focal length f of the optical imaging lens and a half of a maximum field angle Semi-FOV of the optical imaging lens satisfies: 7.65 = f * tan (Semi-FOV) = 7.

96. 13.The optical imaging lens according to claim 1, wherein, A relationship between an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the optical imaging lens and a half of a diagonal length of an effective pixel area on the imaging surface ImgH satisfies: 1.23 = TTL / ImgH = 1.

25. 14.The optical imaging lens according to claim 1, wherein, A relationship between a combined focal length f678 of the sixth lens, the seventh lens and the eighth lens and a combined focal length f12345 of the first lens, the second lens, the third lens, the fourth lens and the fifth lens satisfies: -1.09 = f678 / f12345 = -0.

72.

15. The optical imaging lens according to claim 1, characterized in that, A relationship between an air separation T67 of the sixth lens and the seventh lens on the optical axis, an on-axis distance SAG62 between an intersection of an image side surface of the sixth lens and the optical axis and an effective radius vertex of the image side surface of the sixth lens and an on-axis distance SAG71 between an intersection of an object side surface of the seventh lens and the optical axis and an effective radius vertex of the object side surface of the seventh lens satisfies: -0.39 = T67 / (SAG62 + SAG71) = -0.

29.

16. The optical imaging lens according to claim 1, characterized in that, A relationship between an on-axis distance SAG81 between an intersection of an object side surface of the eighth lens and the optical axis and an effective radius vertex of the object side surface of the eighth lens, an on-axis distance SAG82 between an intersection of an image side surface of the eighth lens and the optical axis and an effective radius vertex of the image side surface of the eighth lens and an effective focal length f8 of the eighth lens satisfies: 0.63 = (SAG81 + SAG82) / f8 = 0.

73.

17. The optical imaging lens according to claim 1, characterized in that, A relationship between a central thickness CT3 of the third lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT6 of the sixth lens on the optical axis and a sum ∑AT of air separations between two adjacent lenses among the first lens to the eighth lens on the optical axis satisfies: 0.55 = (CT3 + CT4 + CT5 + CT6) / ∑AT = 0.57.

Images