TWI783846B - Eight-piece miniaturized imaging lens - Google Patents

Abstract

An eight-piece miniaturized imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a stop, a fifth lens, a sixth lens, a seventh lens and a eighth lens in sequence from an object side to an image side. The first lens has positive refractive power, a convex object surface and a concave image surface. The second lens has concave object and image surfaces. The third lens has convex object and image surfaces. The fourth lens has negative refractive power, a convex object surface and a concave image surface. The fifth lens has positive refractive power, a concave object surface and a convex image surface. The sixth lens has convex object and image surfaces. The seventh lens has negative refractive power, a convex object surface and a concave surface. The eighth lens has convex object and image surfaces.

Description

Eight-element miniaturized imaging lens

The invention relates to an optical lens, in particular to an eight-chip imaging lens.

Optical lenses are widely used by people, and automotive lenses are also commonly used. Among them, under the trend of improving the imaging quality of the system, how to further reduce the sensitivity of the system is really worthy of consideration by those in the field.

The main purpose of the present invention is to provide an eight-chip imaging lens that can reduce system sensitivity.

In order to achieve the above and other objects, the present invention provides an eight-piece miniaturized imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, The sixth lens, the seventh lens and the eighth lens. The first lens has negative refractive power, its object side is convex and its image side is concave. Both the object side and the image side of the second lens are concave. Both the object side and the image side of the third lens are convex. The fourth lens has negative refractive power, its object side is convex and its image side is concave. The fifth lens has positive refractive power, its object side is concave and its image side is convex. Both the object side and the image side of the sixth lens are convex. The seventh lens has negative refractive power, its object side is convex and its image side is concave. Both the object side and the image side of the eighth lens are convex. By matching the refractive power and surface shape of each lens, the optical path can be flattened, thereby reducing the sensitivity of the system.

As in the aforementioned eight-piece miniaturized imaging lens, the following relationship can also be satisfied: 5<TTL/F<8; where TTL is the total length of the system, and F is the focal length of the system; thereby, the purpose of miniaturization can be achieved.

As in the aforementioned eight-piece miniaturized imaging lens, the following relationship can also be satisfied: -6<[(R3+R4)/T3]+[(R5+R6)/T5]<0; where R3 is the second The radius of curvature of the object side of the lens, R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, and T3 is the radius of curvature of the second lens On-axis thickness, T5 is the on-axis thickness of the third lens; thereby, spherical aberration can be corrected.

As in the aforementioned eight-piece miniaturized imaging lens, the following relationship can also be satisfied: 2.5<ATL/Gaa<3; where ATL is the sum of the axial thicknesses of the first to eighth lenses, and Gaa is the first to the sum of the axial distances of the adjacent lenses in the eighth lens; thereby, the effect of correcting coma aberration can be achieved.

As in the aforementioned eight-piece miniaturized imaging lens, the following relationship can also be satisfied: 1.2<SD1/F<1.45; where SD1 is the radius of the effective diameter of the object side surface of the first lens; thereby, the effect of miniaturization can be achieved .

As in the aforementioned eight-piece miniaturized imaging lens, the following relationship can also be satisfied: -2.2<(R9+R10+R13+R14)/(F5*F7)<4.1; where R9 is the object side surface of the fifth lens Radius of curvature, R10 is the radius of curvature of the image side of the fifth lens, R13 is the radius of curvature of the object side of the seventh lens, R14 is the radius of curvature of the seventh lens image side, F5 is the focal length of the fifth lens, and F7 is The focal length of the seventh lens; thereby, the astigmatism can be improved.

As in the aforementioned eight-chip miniaturized imaging lens, the following relationship can also be satisfied: 0<(T4+T6)/(T3+T4+T5+T6+T7)<0.1; where T4 is the second and third The axial distance between the lenses, T6 is the axial distance between the third and fourth lenses, T3 is the axial thickness of the second lens, T5 is the axial thickness of the third lens, and T7 is the fourth lens The on-axis thickness; in this way, the assembly tolerance can be reduced and the manufacturing yield can be improved.

As in the aforementioned eight-piece miniaturized imaging lens, the refractive indices of the first, third, seventh, and eighth lenses can be between 1.79-1.85, and the refractive indices of the second, fourth, fifth, and sixth lenses can be Between 1.53-1.66, and the object side and image side of the first, third, seventh, and eighth lenses can be spherical, and the object side and image side of the second, fourth, fifth, and sixth lenses Both can be aspheric.

Please refer to Figure 1, which shows the first embodiment of the present invention, the eight-piece miniaturized imaging lens (hereinafter referred to as the eight-piece imaging lens) is sequentially arranged from the object side A to the image side B on the optical axis L Including the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the aperture ST, the fifth lens 50, the sixth lens 60, the seventh lens 70 and the eighth lens 80, set at the image side B CCD, CMOS or other photosensitive elements (not shown), can be provided with plate lenses 90, 100 such as optical filters and/or protective glass between the photosensitive element and the fourth lens 40, the number of plate lenses 90, 100 can be Increase or decrease or not set as required.

First of all, it should be stated that in this article, when the center of a curved surface is closer to the image side than the surface itself, the radius of curvature of the surface is a positive value; otherwise, when the center of a curved surface is closer to the surface itself On the object side, the radius of curvature of the surface is negative. And unless otherwise stated, the concave, convex and curvature radii of the "object side" and "image side" all refer to the surface shape and curvature radius of the surface at the optical axis L.

In the first embodiment of the present invention, the first lens 10 has negative refractive power, its object side is convex and its image side is concave; wherein, the ratio of the radius of the effective diameter of the object side of the first lens 10 to the focal length of the system is controlled at Smaller range, thereby achieving the purpose of miniaturization.

The second lens 20 has negative refractive power, and its object side and image side are both concave.

The third lens 30 has positive refractive power, and its object side and image side are both convex; wherein, the second and third lenses 20 and 30 can achieve the effect of correcting spherical aberration by matching the curvature radii.

The fourth lens 40 has a negative refractive power, its object side is convex and its image side is concave, the fourth lens 40 can use a plastic lens, thereby reducing the weight of the lens; in addition, by controlling the axial thickness between the second to fourth lenses And the ratio of the spacing on the shaft can reduce the assembly tolerance and improve the manufacturing yield.

The fifth lens 50 has positive refractive power, its object side is concave and its image side is convex.

The sixth lens 60 has positive refractive power, and its object side and image side are both convex; wherein, the surface design of the fifth and sixth lenses 50 and 60 helps to smooth the optical path, thereby reducing system sensitivity.

The seventh lens 70 has negative refractive power, and its object side is convex and its image side is concave; wherein, the fifth and seventh lenses 50 and 70 can help improve astigmatism by matching their curvature radii and focal lengths.

The eighth lens 80 has positive refractive power, and its object side and image side are both convex. Such a surface design helps to correct spherical aberration and coma.

In the first embodiment, the first lens 10, the third lens 30, the seventh lens 70, and the eighth lens 80 are all glass lenses, and the object side and the image side are all spherical, the second lens 20, the fourth lens 40 1. The fifth lens 50 and the sixth lens 60 are both plastic lenses, and the object side and the image side are both aspherical.

The design parameters of the eight-piece miniaturized imaging lens of this embodiment are shown in Table 1 below. It should be explained first that the distance value corresponding to the object side represents the thickness of the lens on the optical axis L, and the distance value corresponding to the image side represents The distance between the lens and the next lens or the next aperture ST on the optical axis L:

Table I Table 1, the first embodiment The system focal length F is 4.02mm, the system length is 28.83mm, the maximum viewing angle is 120∘, and the aperture value is 1.4 lens noodle Radius of curvature (mm) Distance (mm) Refractive index (Nd) Dispersion coefficient (Vd) focal length(mm) first lens object side 1 42.644 0.412 1.79 47.4 -7.24 like side 2 5.030 3.000 second lens object side 3 -10.974 1.946 1.55 56.0 -8.04 like side 4 7.773 0.080 third lens object side 5 7.072 3.949 1.85 30.1 5.40 like side 6 -9.936 0.120 fourth lens object side 7 800.000 1.521 1.66 20.4 -13.24 like side 8 8.735 1.500 aperture ∞ 0.050 fifth lens object side 9 -115.231 1.961 1.53 55.8 19.99 like side 10 -9.813 0.020 sixth lens object side 11 9.147 3.248 1.53 55.8 9.80 like side 12 -10.687 1.300 seventh lens object side 13 500.000 0.510 1.85 23.8 -10.95 like side 14 9.174 0.200 eighth lens object side 15 9.621 3.025 1.79 44.2 9.56 like side 16 -30.172 1.288 Flat lens (filter) object side 17 ∞ 0.500 1.52 64.1 like profile 18 ∞ 0.100 Flat lens (protective glass) object side 19 ∞ 0.400 1.52 64.1 like side 20 ∞ 3.704

Among them, the surface type of the aspheric surface satisfies the following aspheric surface formula:

Where c=1/r, r is the surface curvature radius, h is the height of light on the surface, k is the cone coefficient, B is the fourth-order coefficient, C is the sixth-order coefficient, D is the eighth-order coefficient, E is the tenth order coefficient. The parameters of each aspheric surface in the first embodiment are shown in Table 2 below:

Table II object side 3 like side 4 object side 7 like side 8 k -2.34164 -0.38152 21.10036 1.827341 B 0.000625 0.00075 -0.00426 -0.00412 C -0.00003 0.000001 0.00014 0.00021 D. 0.0000002 -0.0000005 -0.000001 -0.000008 E. -0.00000002 0.000000004 -0.00000003 0.0000002 object side 9 like side 10 object side 11 like side 12 k 790.0198 -2.09725 -0.09239 -4.5 B 0.001098 0.000353 -0.0013 0.00054 C -0.00012 -0.00007 0.00001 -0.00001 D. 0.000004 0.0000004 -0.0000002 0.00000001 E. 0.00000003 -0.0000002 0 0

According to Table 1 and Table 2, the following relational values in Table 3 can be obtained:

Table three Relational value TTL/F 7.18 [(R3+R4)/T3]+[(R5+R6)/T5] -2.37 ATL/Gaa 2.66 SD1/F 1.30 (R9+R10+R13+R14)/(F5*F7) -1.8 (T4+T6)/(T3+T4+T5+T6+T7) 0.03

In this way, the eight-piece miniaturized imaging lens of this embodiment can exhibit good imaging quality through the collocation and combination of the lenses. The field curvature and distortion diagrams can be seen in Figures 2 and 3, and the lateral chromatic aberration diagram can be seen in Figure 4. It is obvious that this embodiment has a good imaging effect.

Please refer to Fig. 5, which is the second embodiment of this creation, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-piece imaging lens of this embodiment are shown in Table 4 below:

Table four Table four, the second embodiment The system focal length F is 4.29mm, the system length is 27.43mm, the maximum viewing angle is 120∘, and the aperture value is 1.55 lens noodle Radius of curvature (mm) Distance (mm) Refractive index (Nd) Dispersion coefficient (Vd) focal length(mm) first lens object side 1 223.908 0.834 1.79 47.4 -7.43 like side 2 5.724 2.814 second lens object side 3 -10.662 1.551 1.55 56 -8.06 like side 4 7.876 0.050 third lens object side 5 6.646 3.680 1.85 30.1 5.26 like side 6 -10.401 0.164 fourth lens object side 7 700.000 2.057 1.66 20.4 -12.01 like side 8 7.915 1.263 aperture ∞ 0.021 fifth lens object side 9 -950.000 1.625 1.54 55.7 18.49 like side 10 -9.833 0.100 sixth lens object side 11 8.661 3.039 1.54 55.7 9.35 like side 12 -10.495 1.105 seventh lens object side 13 153.850 0.794 1.85 23.8 -10.75 like side 14 8.643 0.200 eighth lens object side 15 8.805 2.611 1.79 44.2 9.30 like side 16 -38.380 1.288 Flat lens (filter) object side 17 ∞ 0.500 1.52 64.1 like profile 18 ∞ 0.100 Flat lens (protective glass) object side 19 ∞ 0.400 1.52 64.1 like side 20 ∞ 3.231

The parameters of each aspheric surface of the second embodiment are shown in Table 5 below:

Table five object side 3 like side 4 object side 7 like side 8 k -0.06359 -0.40882 -131449 1.863438 B 0.000401 0.000786 -0.00427 -0.00417 C -0.00003 0.000003 0.00014 -0.00003 D. 0.0000009 -0.0000001 -0.000001 0.0000009 E. -0.000000008 0.00000005 -0.0000001 -0.000000008 object side 9 like side 10 object side 11 like side 12 k 0 -2.76735 -0.13783 0.995536 B 0.001593 0.000289 -0.0013 0.00054 C -0.00010 -0.00009 0.00001 -0.00001 D. 0.000004 0.000001 -0.0000002 0.00000001 E. -0.00000003 0.00000007 0 0

According to Table 4 and Table 5, the relational values in the following Table 6 can be obtained:

Table six Relational value TTL/F 6.39 [(R3+R4)/T3]+[(R5+R6)/T5] -2.82 ATL/Gaa 2.84 SD1/F 1.26 (R9+R10+R13+R14)/(F5*F7) 4.0 (T4+T6)/(T3+T4+T5+T6+T7) 0.03

In this way, the eight-piece miniaturized imaging lens of this embodiment can exhibit good imaging quality through the collocation and combination of the lenses. The field curvature and distortion diagrams can be seen in Figures 6 and 7, and the lateral chromatic aberration diagram can be seen in Figure 8. It is obvious that this embodiment has a good imaging effect.

Please refer to Fig. 9, which is the third embodiment of this creation, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-chip imaging lens of this embodiment are shown in Table 7 below:

Table seven Table seven, the third embodiment The system focal length F is 4.13mm, the system length is 23.75mm, the maximum viewing angle is 120∘, and the aperture value is 1.65 lens noodle Radius of curvature (mm) Distance (mm) Refractive index (Nd) Dispersion coefficient (Vd) focal length(mm) first lens object side 1 422.752 0.300 1.79 47.4 -7.23 like side 2 5.643 2.665 second lens object side 3 -11.280 0.726 1.55 56 -8.44 like side 4 7.966 0.050 third lens object side 5 6.664 2.645 1.85 30.1 5.06 like side 6 -10.097 0.171 fourth lens object side 7 50.000 2.804 1.64 23.5 -14.02 like side 8 7.487 0.932 aperture ∞ -0.066 fifth lens object side 9 -205.976 1.247 1.54 55.7 18.73 like side 10 -9.611 0.100 sixth lens object side 11 10.748 3.059 1.54 55.7 8.95 like side 12 -7.827 0.992 seventh lens object side 13 30.865 0.223 1.85 23.8 -14.53 like side 14 8.822 0.200 eighth lens object side 15 8.863 2.389 1.79 44.2 9.23 like side 16 -36.251 1.288 Flat lens (filter) object side 17 ∞ 0.500 1.52 64.1 like profile 18 ∞ 0.100 Flat lens (protective glass) object side 19 ∞ 0.400 1.52 64.1 like side 20 ∞ 3.027

The parameters of each aspheric surface of the third embodiment are shown in Table 8 below:

table eight object side 3 like side 4 object side 7 like side 8 k -1.15594 -1.3141 -1157.36 3.352347 B 0.000453 0.00048 -0.0045 -0.00332 C -0.00001 -0.000006 0.00012598 0.000167081 D. 0.000001 0.0000001 -0.000001 -0.00003 E. -0.00000002 0.0000002 0.00000002 -0.000001 object side 9 like side 10 object side 11 like side 12 k 0 -7.68619 -2.78698 -0.05769 B 0.000982 0.000748 -0.0013 0.00054 C -0.00011 -0.00012 0.00001 -0.00001 D. 0.000009 -0.000009 -0.0000002 0.00000001 E. 0.000003 -0.0000007 0 0

According to Table 7 and Table 8, the relational values in the following Table 9 can be obtained:

Table nine Relational value TTL/F 5.75 [(R3+R4)/T3]+[(R5+R6)/T5] -5.86 ATL/Gaa 2.62 SD1/F 1.27 (R9+R10+R13+R14)/(F5*F7) 0.6 (T4+T6)/(T3+T4+T5+T6+T7) 0.04

In this way, the eight-piece miniaturized imaging lens of this embodiment can exhibit good imaging quality through the collocation and combination of the lenses. The field curvature and distortion diagrams can be seen in Figures 10 and 11, and the lateral chromatic aberration diagram can be seen in Figure 12. It is obvious that this embodiment has a good imaging effect.

Please refer to Fig. 13, which is the fourth embodiment of this creation, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-piece imaging lens of this embodiment are shown in Table 10 below:

table ten Table ten, the fourth embodiment The system focal length F is 4.37mm, the system length is 27.94mm, the maximum viewing angle is 126∘, and the aperture value is 1.65 lens noodle Radius of curvature (mm) Distance (mm) Refractive index (Nd) Dispersion coefficient (Vd) focal length(mm) first lens object side 1 67.570 1.286 1.84 42.7 -6.95 like side 2 5.322 2.869 second lens object side 3 -11.457 1.775 1.54 55.7 -8.06 like side 4 7.341 0.016 third lens object side 5 6.230 4.014 1.85 30.1 5.31 like side 6 -11.838 0.388 fourth lens object side 7 553.500 1.547 1.64 23.5 -11.53 like side 8 7.331 1.346 aperture ∞ -0.023 fifth lens object side 9 -130.500 1.620 1.54 55.7 18.60 like side 10 -9.320 0.030 sixth lens object side 11 9.872 2.451 1.54 55.7 8.82 like side 12 -8.312 1.131 seventh lens object side 13 85.500 0.727 1.85 23.8 -9.90 like side 14 7.663 0.250 eighth lens object side 15 9.385 2.850 1.79 44.2 9.89 like side 16 -40.327 1.288 Flat lens (filter) object side 17 ∞ 0.500 1.52 64.1 like profile 18 ∞ 0.100 Flat lens (protective glass) object side 19 ∞ 0.400 1.52 64.1 like side 20 ∞ 3.379

The parameters of each aspheric surface of the fourth embodiment are shown in Table 11 below:

Table Eleven object side 3 like side 4 object side 7 like side 8 k 0.690224 -0.47074 -347000 2.099031 B 0.000247 0.000698 -0.00435 -0.00402 C -0.00002 0.000005 0.0001320768 0.00021304953 D. 0.000001 0.0000001 -0.000002 -0.00001 E. -0.00000003 0.00000004 -0.0000001 -0.0000003 object side 9 like side 10 object side 11 like side 12 k 0 -1.50583 0.290114 1.337103 B 0.001742 0.000174 -0.0013 0.00054 C -0.00011 -0.00008 0.00001 -0.00001 D. 0.000002 0.000002 -0.0000002 0.00000001 E. -0.0000001 0.00000004 0 0

According to Table 10 and Table 11, the following relational values in Table 12 can be obtained:

Table 12 Relational value TTL/F 6.39 [(R3+R4)/T3]+[(R5+R6)/T5] -3.72 ATL/Gaa 2.70 SD1/F 1.39 (R9+R10+R13+R14)/(F5*F7) 0.3 (T4+T6)/(T3+T4+T5+T6+T7) 0.05

In this way, the eight-piece miniaturized imaging lens of this embodiment can exhibit good imaging quality through the collocation and combination of the lenses. The field curvature and distortion diagrams can be seen in Figures 14 and 15, and the lateral chromatic aberration diagram can be seen in Figure 16. It is obvious that this embodiment has a good imaging effect.

Please refer to Fig. 17, which is the fifth embodiment of this creation, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-piece imaging lens of this embodiment are shown in Table 13 below:

Table 13 Table 13, the fifth embodiment The system focal length F is 4.28mm, the system length is 27.01mm, the maximum viewing angle is 132∘, and the aperture value is 1.65 lens noodle Radius of curvature (mm) Distance (mm) Refractive index (Nd) Dispersion coefficient (Vd) focal length(mm) first lens object side 1 252.000 0.800 1.84 42.7 -7.87 like side 2 6.425 2.898 second lens object side 3 -9.216 1.740 1.54 55.7 -8.00 like side 4 8.576 0.050 third lens object side 5 7.332 3.985 1.81 39.6 5.56 like side 6 -8.801 0.473 fourth lens object side 7 689.550 1.326 1.64 23.5 -11.50 like side 8 7.331 1.286 aperture ∞ -0.043 fifth lens object side 9 -380.370 1.633 1.54 55.7 16.28 like side 10 -8.558 0.030 sixth lens object side 11 8.006 2.689 1.54 55.7 8.72 like side 12 -9.969 1.103 seventh lens object side 13 685.470 0.626 1.92 18.9 -8.68 like side 14 8.004 0.050 eighth lens object side 15 8.129 2.771 1.75 35.3 9.83 like side 16 -71.730 1.288 Flat lens (filter) object side 17 ∞ 0.500 1.52 64.1 like profile 18 ∞ 0.100 Flat lens (protective glass) object side 19 ∞ 0.400 1.52 64.1 like side 20 ∞ 3.302

The parameters of each aspheric surface of the fifth embodiment are shown in Table 14 below:

Table Fourteen object side 3 like side 4 object side 7 like side 8 k 2.125539 0.083027 -95205.7 1.876272 B 0.000008 0.000843 -0.00423 -0.00416 C -0.00003 0.00001 0.00013 0.00020 D. 0.000001 0.0000003 -0.000001 -0.00001 E. -0.000000004 -0.00000001 -0.0000001 -0.0000006 object side 9 like side 10 object side 11 like side 12 k 0 -1.61702 0.153481 1.166585 B 0.001723 0.000201 -0.00134 0.000594 C -0.00011 -0.00007 0.00001 -0.00001 D. 0.000003 0.000002 -0.00000002 -0.0000003 E. 0.0000002 0.00000004 0 0

According to Table 13 and Table 14, the relational values in the following Table 15 can be obtained:

Table 15 Relational value TTL/F 6.31 [(R3+R4)/T3]+[(R5+R6)/T5] -0.74 ATL/Gaa 2.64 SD1/F 1.23 (R9+R10+R13+R14)/(F5*F7) -2.2 (T4+T6)/(T3+T4+T5+T6+T7) 0.07

In this way, the eight-piece miniaturized imaging lens of this embodiment can exhibit good imaging quality through the collocation and combination of the lenses. The field curvature and distortion diagrams can be seen in Figures 18 and 19, and the lateral chromatic aberration diagram can be seen in Figure 20. It is obvious that this embodiment has a good imaging effect.

Please refer to Fig. 21, which is the sixth embodiment of this creation, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-piece imaging lens of this embodiment are shown in Table 16 below:

Table 16 Table sixteen, the sixth embodiment The system focal length F is 4.48mm, the system length is 31.24mm, the maximum viewing angle is 132∘, and the aperture value is 1.85 lens noodle Radius of curvature (mm) Distance (mm) Refractive index (Nd) Dispersion coefficient (Vd) focal length(mm) first lens object side 1 150.000 0.800 1.84 42.7 -8.04 like side 2 6.443 3.199 second lens object side 3 -7.898 1.900 1.54 55.7 -7.22 like side 4 8.258 0.050 third lens object side 5 7.249 5.000 1.81 39.6 5.78 like side 6 -9.114 0.610 fourth lens object side 7 100.500 1.383 1.64 23.5 -12.48 like side 8 7.410 1.483 aperture ∞ 0.344 fifth lens object side 9 -252.016 1.794 1.54 55.7 22.15 like side 10 -11.387 0.030 sixth lens object side 11 8.581 3.200 1.54 55.7 8.62 like side 12 -8.733 1.274 seventh lens object side 13 80.105 0.900 1.92 18.9 -8.97 like side 14 7.536 0.300 eighth lens object side 15 9.157 3.200 1.75 35.3 11.37 like side 16 -113.889 1.288 Flat lens (filter) object side 17 ∞ 0.500 1.52 64.1 like profile 18 ∞ 0.100 Flat lens (protective glass) object side 19 ∞ 0.400 1.52 64.1 like side 20 ∞ 3.486

The parameters of each aspheric surface of the sixth embodiment are shown in Table 17 below:

Table 17 object side 3 like side 4 object side 7 like side 8 k 1.507737 -0.77896 -1084.15 1.695639 B 0.000224 0.000614 -0.00412 -0.00426 C -0.00001 0.00001 0.00015 0.00020 D. 0.000002 0.0000004 -0.0000007 -0.000008 E. -0.00000003 0.000000008 -0.0000002 0.0000003 object side 9 like side 10 object side 11 like side 12 k 0 -1.95127 0.245735 1.226668 B 0.001563 0.000298 -0.00134 0.000605 C -0.00011 -0.00009 0.00001 -0.00001 D. 0.000004 0.000002 -0.0000009 -0.0000002 E. 0.0000002 0.0000003 0 0

According to Table 16 and Table 17, the relational values in the following Table 18 can be obtained:

Table 18 Relational value TTL/F 6.97 [(R3+R4)/T3]+[(R5+R6)/T5] -0.18 ATL/Gaa 2.62 SD1/F 1.22 (R9+R10+R13+R14)/(F5*F7) 0.9 (T4+T6)/(T3+T4+T5+T6+T7) 0.07

In this way, the eight-piece miniaturized imaging lens of this embodiment can exhibit good imaging quality through the collocation and combination of the lenses. The field curvature and distortion diagrams can be seen in Figures 22 and 23, and the lateral chromatic aberration diagram can be seen in Figure 24. It is obvious that this embodiment has a good imaging effect.

10: First lens 20: second lens 30: Third lens 40: Fourth lens 50: fifth lens 60: sixth lens 70: seventh lens 80: eighth lens 90, 100: flat lens A: Object side B: image side ST: Aperture L: optical axis

Fig. 1 is a schematic diagram of the first embodiment of the present invention.

Fig. 2 is a field curvature diagram of the first embodiment of the present invention.

Fig. 3 is a distortion map of the first embodiment of the present invention.

Fig. 4 is a lateral color difference diagram of the first embodiment of the present invention.

Fig. 5 is a schematic diagram of the second embodiment of the present invention.

Fig. 6 is a field curvature diagram of the second embodiment of the present invention.

Fig. 7 is a distortion diagram of the second embodiment of the present invention.

Fig. 8 is a lateral color difference diagram of the second embodiment of the present invention.

Fig. 9 is a schematic diagram of the third embodiment of the present invention.

Fig. 10 is a field curvature diagram of the third embodiment of the present invention.

Fig. 11 is a distortion diagram of the third embodiment of the present invention.

Fig. 12 is a lateral color difference diagram of the third embodiment of the present invention.

Fig. 13 is a schematic diagram of the fourth embodiment of the present invention.

Fig. 14 is a field curvature diagram of the fourth embodiment of the present invention.

Fig. 15 is a distortion map of the fourth embodiment of the present invention.

Fig. 16 is a lateral color difference diagram of the fourth embodiment of the present invention.

Fig. 17 is a schematic diagram of the fifth embodiment of the present invention.

Fig. 18 is a field curvature diagram of the fifth embodiment of the present invention.

Fig. 19 is a distortion diagram of the fifth embodiment of the present invention.

Fig. 20 is a lateral color difference diagram of the fifth embodiment of the present invention.

Fig. 21 is a schematic diagram of the sixth embodiment of the present invention.

Fig. 22 is a field curvature diagram of the sixth embodiment of the present invention.

Fig. 23 is a distortion map of the sixth embodiment of the present invention.

Fig. 24 is a lateral color difference diagram of the sixth embodiment of the present invention.

10: First lens

20: second lens

30: Third lens

40: Fourth lens

50: fifth lens

60: sixth lens

70: seventh lens

80: eighth lens

90, 100: flat lens

A: Object side

B: image side

ST: Aperture

L: optical axis

Claims (11)

An eight-piece miniaturized imaging lens, which includes in sequence from the object side to the image side: A first lens with negative refractive power, its object side is convex and its image side is concave; A second lens, the object side and the image side of which are both concave; A third lens whose object side and image side are both convex; - a fourth lens with negative refractive power, the object side is convex and the image side is concave; an aperture; a fifth lens with positive refractive power, the object side is concave and the image side is convex; - a sixth lens, the object side and the image side of which are both convex; a seventh lens, having a negative refractive power, the object side is convex and the image side is concave; and One eighth eyeglass, its object side and its image side are both convex. The eight-chip miniaturized imaging lens as described in Claim 1 further satisfies the following relationship: 5<TTL/F<8; where TTL is the total length of the system, and F is the focal length of the system. The eight-chip miniaturized imaging lens as described in claim 1 further satisfies the following relationship: -6<[(R3+R4)/T3]+[(R5+R6)/T5]<0; where R3 is the The radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, and T3 is the radius of curvature of the second lens. The axial thickness of the lens, T5 is the axial thickness of the third lens. The eight-piece miniaturized imaging lens as described in Claim 1 further satisfies the following relationship: 2.5<ATL/Gaa<3; where ATL is the sum of the axial thicknesses of the first to eighth lenses, and Gaa is The sum of the on-axis spacing of each adjacent lens in the first to eighth lenses. The eight-chip miniaturized imaging lens as described in Claim 1 further satisfies the following relationship: 1.2<SD1/F<1.45; where SD1 is the radius of the effective diameter of the object side surface of the first lens, and F is the focal length of the system. The eight-chip miniaturized imaging lens as described in Claim 1 further satisfies the following relationship: -2.2<(R9+R10+R13+R14)/(F5*F7)<4.1; where R9 is the fifth lens object The radius of curvature of the side, R10 is the radius of curvature of the image side of the fifth lens, R13 is the radius of curvature of the object side of the seventh lens, R14 is the radius of curvature of the seventh lens image side, F5 is the focal length of the fifth lens, F7 is the focal length of the seventh lens. The eight-chip miniaturized imaging lens as described in Claim 1 further satisfies the following relational expression: 0<(T4+T6)/(T3+T4+T5+T6+T7)<0.1; where T4 is the second, The axial distance between the third lenses, T6 is the axial distance between the third and fourth lenses, T3 is the axial thickness of the second lens, T5 is the axial thickness of the third lens, and T7 is the axial thickness of the second lens. The axial thickness of the four mirrors. The eight-element miniaturized imaging lens according to claim 1, wherein the refractive index of the first, third, seventh, and eighth lenses is between 1.79-1.85. The eight-element miniaturized imaging lens according to claim 1, wherein the refractive index of the second, fourth, fifth, and sixth lenses is between 1.53-1.66. The eight-piece miniaturized imaging lens according to Claim 1, wherein the object side and image side of the first, third, seventh, and eighth lenses are all spherical. The eight-piece miniaturized imaging lens according to claim 1, wherein the object side and image side of the second, fourth, fifth, and sixth lenses are all aspherical.

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