Imaging lens

Abstract

An imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is a meniscus lens with negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has refractive power. The third lens has refractive power. The fourth lens has negative refractive power, and the fourth lens includes a concave surface facing the object side. The fifth lens has positive refractive power, and the fifth lens includes a convex surface facing the image side. The sixth lens has positive refractive power, and the sixth lens includes a convex surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order along an optical axis from the object side to the image side.

Description

Technical Field

[0001] This invention relates to an imaging lens. Background Technology

[0002] The current trend in imaging lens development, in addition to continuously moving towards higher resolution, also requires large apertures to meet the needs of capturing images both day and night, depending on different application requirements. Conventional imaging lenses can no longer meet current needs, and a new type of imaging lens architecture is needed to simultaneously meet the requirements of high resolution, large aperture, and capturing images both day and night. Summary of the Invention

[0003] In view of this, the main objective of the present invention is to provide an imaging lens with high resolution and small aperture value.

[0004] The present invention provides an imaging lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens, and including a convex surface facing an object side and a concave surface facing an image side; a second lens having refractive power; a third lens having refractive power; a fourth lens having negative refractive power, the fourth lens including a concave surface facing the object side; a fifth lens having positive refractive power, the fifth lens including a convex surface facing the image side; and a sixth lens having positive refractive power, the sixth lens including a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis from the object side to the image side;

[0005] The imaging lens satisfies at least one of the following conditions:

[0006] -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4;

[0007] 0.7 ≤ f5 / f ≤ 1.1;

[0008] 10 mm ≤ f23 ≤ 16 mm;

[0009] 1.11 ≤ BFL / f ≤ 1.21;

[0010] 8.32 mm ≤ T4+T5+T6 ≤ 12.16 mm;

[0011] 2.07 ≤ R42 / T4 ≤ 2.93;

[0012] 8.54 degrees / mm ≤ FOV / f ≤ 8.68 degrees / mm;

[0013] 10 < (∣f6×R62∣)0.5 / (T3) < 32;

[0014] 41 mm < f5 / (T4 / T3) < 120 mm;

[0015] Where f is the effective focal length of the imaging lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f23 is the effective focal length of the combination of the second and third lenses, T3 is the distance between the object-side surface of the third lens and the image-side surface of the third lens on the optical axis, T4 is the distance between the object-side surface of the fourth lens and the image-side surface of the fourth lens on the optical axis, T5 is the distance between the object-side surface of the fifth lens and the image-side surface of the fifth lens on the optical axis, T6 is the distance between the object-side surface of the sixth lens and the image-side surface of the sixth lens on the optical axis, R42 is the radius of curvature of the image-side surface of the fourth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, TTL is the distance between the object-side surface of the first lens and the imaging plane on the optical axis, BFL is the distance between the image-side surface of the sixth lens and the imaging plane on the optical axis, θ is the angle of view of the imaging lens at an image height of 3.304 mm, and FOV is the field of view of the imaging lens.

[0016] According to the imaging lens of the present invention, the second lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; the third lens has negative refractive power and includes a concave surface facing the object side and a concave surface facing the image side; the fourth lens includes a concave surface facing the image side; the fifth lens includes a convex surface facing the object side; and the sixth lens includes a convex surface facing the image side.

[0017] According to the imaging lens of the present invention, the second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; the third lens has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side; the fourth lens includes a concave surface facing the image side; the fifth lens includes a convex surface facing the object side; and the sixth lens includes a convex surface facing the image side.

[0018] According to the imaging lens of the present invention, the second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; the third lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; the fourth lens includes a concave surface facing the image side; the fifth lens includes a convex surface facing the object side; and the sixth lens includes a convex surface facing the image side.

[0019] According to the imaging lens of the present invention, the second lens has negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side; the third lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; the fourth lens includes a concave surface facing the image side; the fifth lens includes a convex surface facing the object side; and the sixth lens includes a convex surface facing the image side.

[0020] According to the imaging lens of the present invention, the second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; the third lens has positive refractive power and includes a convex surface facing the object side and a flat surface facing the image side; the fourth lens includes a concave surface facing the image side; the fifth lens includes a convex surface facing the object side; and the sixth lens includes a convex surface facing the image side.

[0021] According to the imaging lens of the present invention, the second lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; the third lens has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side; the fourth lens includes a concave surface facing the image side; the fifth lens includes a convex surface facing the object side; and the sixth lens includes a convex surface facing the image side.

[0022] According to the imaging lens of the present invention, the imaging lens satisfies at least one of the following conditions:

[0023] 1.5 ≤ (Vd1+Vd2) / ∣Vd1-Vd2∣≤ 5.5;

[0024] 2 ≤ (Vd2+Vd3) / ∣Vd2-Vd3∣≤ 2.7;

[0025] 1.5 ≤ (Vd4+Vd5) / ∣Vd4-Vd5∣≤ 2.5;

[0026] 1.3 ≤ f6 / f ≤ 1.8;

[0027] 1.5 mm ≤ T4 / Nd4 ≤ 1.9 mm;

[0028] 3.6 mm ≤ BFL / Nd6 ≤ 4.1 mm;

[0029] 0.08 ≤ (R11-R12) / TTL ≤ 0.31;

[0030] 304.47 ≤ TTL / d56 ≤ 318.48;

[0031] -16 mm < (R11 / R41)×T5 < -1 mm;

[0032] 12 mm < (R21×R62) 0.5 < 141 mm;

[0033] 5 mm -1 < Vd1 / T1 < 118 mm -1 ;

[0034] -13 < (R11+R22) / T1 < 80;

[0035] 28 mm < (d12 / T2)×R42 < 53 mm;

[0036] 25 mm < (R11-R62) / Nd2 < 88 mm;

[0037] -45 mm 2 < (f2+f5)×T3 < 135 mm 2 ;

[0038] 19 mm < (R41×R62) 0.5 < 39 mm

[0039] Where f is the effective focal length of the imaging lens, f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, T1 is the distance between the object-side surface of the first lens and the image-side surface of the first lens on the optical axis, T2 is the distance between the object-side surface of the second lens and the image-side surface of the second lens on the optical axis, T3 is the distance between the object-side surface of the third lens and the image-side surface of the third lens on the optical axis, T4 is the distance between the object-side surface of the fourth lens and the image-side surface of the fourth lens on the optical axis, T5 is the distance between the object-side surface of the fifth lens and the image-side surface of the fifth lens on the optical axis, R11 is the radius of curvature of the object-side surface of the first lens, R12 is the radius of curvature of the image-side surface of the first lens, R21 is the radius of curvature of the object-side surface of the second lens, R22 is the radius of curvature of the image-side surface of the second lens, and R41 is... The radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, d12 is the air gap on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens, d56 is the air gap on the optical axis between the image-side surface of the fifth lens and the object-side surface of the sixth lens, TTL is the distance on the optical axis between the object-side surface of the first lens and the imaging plane, BFL is the distance on the optical axis between the image-side surface of the sixth lens and the imaging plane, Vd1 is the Abbe coefficient of the first lens, Vd2 is the Abbe coefficient of the second lens, Vd3 is the Abbe coefficient of the third lens, Vd4 is the Abbe coefficient of the fourth lens, Vd5 is the Abbe coefficient of the fifth lens, Nd2 is the refractive index of the second lens, Nd4 is the refractive index of the fourth lens, and Nd6 is the refractive index of the sixth lens.

[0040] The present invention provides an imaging lens, wherein a first lens has negative refractive power, the first lens being a meniscus lens and including a convex surface facing an object side and a concave surface facing an image side; a second lens has positive refractive power; a third lens has negative refractive power; a fourth lens has negative refractive power, the fourth lens including a concave surface facing the object side; a fifth lens has positive refractive power, the fifth lens including a convex surface facing the image side; and a sixth lens has positive refractive power, the sixth lens including a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis from the object side to the image side.

[0041] According to the imaging lens of the present invention, the second lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side; the third lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side; the fourth lens is a biconcave lens, and further includes another concave surface facing the object side; the fifth lens is a biconvex lens, and further includes another convex surface facing the image side; the sixth lens is a biconvex lens, and further includes another convex surface facing the image side; the second lens and the third lens are cemented together, or there is no air gap between the second lens and the third lens; and the fourth lens and the fifth lens are cemented together, or there is no air gap between the fourth lens and the fifth lens.

[0042] According to the imaging lens of the present invention, the imaging lens satisfies at least one of the following conditions:

[0043] -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4;

[0044] 1.5 ≤ (Vd1+Vd2) / ∣Vd1-Vd2∣≤ 5.5;

[0045] 2 ≤ (Vd2+Vd3) / ∣Vd2-Vd3∣≤ 2.7;

[0046] 1.5 ≤ (Vd4+Vd5) / ∣Vd4-Vd5∣≤ 2.5;

[0047] 0.7 ≤ f5 / f ≤ 1.1;

[0048] 1.3 ≤ f6 / f ≤ 1.8;

[0049] 10 mm ≤ f23 ≤ 16 mm;

[0050] 1.5 mm ≤ T4 / Nd4 ≤ 1.9 mm;

[0051] 3.6 mm ≤ BFL / Nd6 ≤ 4.1 mm;

[0052] 1.11 ≤ BFL / f ≤ 1.21;

[0053] 8.32 mm ≤ T4+T5+T6 ≤ 12.16 mm;

[0054] 0.08 ≤ (R11-R12) / TTL ≤ 0.31;

[0055] 2.07 ≤ R42 / T4 ≤ 2.93;

[0056] 304.47 ≤ TTL / d56 ≤ 318.48;

[0057] 8.54 degrees / mm ≤ FOV / f ≤ 8.68 degrees / mm;

[0058] -16 mm < (R11 / R41)×T5 < -1 mm;

[0059] 12 mm < (R21×R62) 0.5 < 141 mm;

[0060] 5 mm -1 < Vd1 / T1 < 118 mm -1 ;

[0061] 10 < (∣f6×R62∣) 0.5 / (T3) < 32;

[0062] -13 < (R11+R22) / T1 < 80;

[0063] 41 mm < f5 / (T4 / T3) < 120 mm;

[0064] 28 mm < (d12 / T2)×R42 < 53 mm;

[0065] 25 mm < (R11-R62) / Nd2 < 88 mm;

[0066] -45 mm 2 < (f2+f5)×T3 < 135 mm 2 ;

[0067] 19 mm < (R41×R62) 0.5 < 39 mm;

[0068] Where f is the effective focal length of the imaging lens, f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f23 is the effective focal length of the combination of the second and third lenses, T1 is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the first lens, T2 is the distance on the optical axis from the object-side surface of the second lens to the image-side surface of the second lens, T3 is the distance on the optical axis from the object-side surface of the third lens to the image-side surface of the third lens, T4 is the distance on the optical axis from the object-side surface of the fourth lens to the image-side surface of the fourth lens, T5 is the distance on the optical axis from the object-side surface of the fifth lens to the image-side surface of the fifth lens, T6 is the distance on the optical axis from the object-side surface of the sixth lens to the image-side surface of the sixth lens, R11 is the radius of curvature of the object-side surface of the first lens, R12 is the radius of curvature of the image-side surface of the first lens, and R21 is the radius of curvature of the object-side surface of the second lens. R22 is the radius of curvature of the image-side surface of the second lens, R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, d12 is the air gap on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens, d56 is the air gap on the optical axis between the image-side surface of the fifth lens and the object-side surface of the sixth lens, and TTL is the radius of curvature of the image-side surface of the first lens. The distance from the object side to the imaging plane on the optical axis, BFL is the distance from the image side to the imaging plane of the sixth lens on the optical axis, Vd1 is the Abbe coefficient of the first lens, Vd2 is the Abbe coefficient of the second lens, Vd3 is the Abbe coefficient of the third lens, Vd4 is the Abbe coefficient of the fourth lens, Vd5 is the Abbe coefficient of the fifth lens, Nd4 is the refractive index of the fourth lens, Nd6 is the refractive index of the sixth lens, θ is the angle of view of the imaging lens at an image height of 3.304 mm, and FOV is the field of view of the imaging lens.

[0069] The imaging lens of this invention has high resolution and a small aperture value. It can capture clear images simultaneously during the day and at night. Attached Figure Description

[0070] Figure 1 , 6 11 and 12 are schematic diagrams of lens configurations according to the first, second and third embodiments of the imaging lens of the present invention.

[0071] Figure 2 , 3Figures 4, 5, and 6 are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, and lateral color diagram of the imaging lens according to the first embodiment of the present invention.

[0072] Figure 7 , 8 9 and 10 are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, and lateral chromatic aberration diagram of the imaging lens according to the second embodiment of the present invention.

[0073] Figure 12 , 13 14 and 15 are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, and lateral chromatic aberration diagram of the imaging lens according to the third embodiment of the present invention.

[0074] Figure 16 , 21 22, 23, and 28 are schematic diagrams of lens configuration and optical path of the fourth, fifth, sixth, seventh, and eighth embodiments of the imaging lens according to the present invention.

[0075] Figure 17 , 18 19 and 20 are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, and relative illumination diagram of the imaging lens according to the fourth embodiment of the present invention.

[0076] Figure 24 , 25 26 and 27 are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, and relative illumination diagram of the imaging lens according to the seventh embodiment of the present invention.

[0077] Figure 29 , 30 Figures 31 and 32 are respectively a longitudinal aberration diagram, a field curvature diagram, a distortion diagram, and a relative illumination diagram of the imaging lens according to the eighth embodiment of the present invention. Detailed Implementation

[0078] This invention provides an imaging lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens, and including a convex surface facing the object side and a concave surface facing the image side; a second lens having refractive power; a third lens having refractive power; a fourth lens having negative refractive power, the fourth lens including a concave surface facing the object side; a fifth lens having positive refractive power, the fifth lens including a convex surface facing the image side; and a sixth lens having positive refractive power, the sixth lens including a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis from the object side to the image side; wherein the imaging lens satisfies at least one of the following conditions: -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4; 0.7 ≤ f5 / f ≤ 1.1; 10mm ≤ f23 ≤ 16 mm; 1.11 ≤ BFL / f ≤ 1.21; 8.32 mm ≤ T4+T5+T6 ≤ 12.16 mm; 2.07≤ R42 / T4 ≤ 2.93; 8.54 degrees / mm ≤ FOV / f ≤ 8.68 degrees / mm; 10 < (∣f6×R62∣)0.5 / (T3) <32; 41 mm < f5 / (T4 / T3) < 120 mm; where f is the effective focal length of the imaging lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f23 is the effective focal length of the combination of the second and third lenses, T3 is the distance between the object side and the image side of the third lens on the optical axis, T4 is the distance between the object side and the image side of the fourth lens on the optical axis, T5 is the distance between the object side and the image side of the fifth lens on the optical axis, T6 is the distance between the object side and the image side of the sixth lens on the optical axis, R42 is the radius of curvature of the image side of the fourth lens, R62 is the radius of curvature of the image side of the sixth lens, TTL is the distance between the object side and the imaging plane of the first lens on the optical axis, BFL is the distance between the image side and the imaging plane of the sixth lens on the optical axis, θ is the angle of view of the imaging lens at an image height of 3.304 mm, and FOV is the field of view of the imaging lens. When the imaging lens of the present invention satisfies the above features and at least one of the conditions, it is a preferred embodiment of the present invention.

[0079] This invention provides another imaging lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens, and including a convex surface facing the object side and a concave surface facing the image side; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power, the fourth lens including a concave surface facing the object side; a fifth lens having positive refractive power, the fifth lens including a convex surface facing the image side; and a sixth lens having positive refractive power, the sixth lens including a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis from the object side to the image side. When the imaging lens of this invention satisfies the above features, it is a preferred embodiment of this invention.

[0080] Please refer to Tables 1, 3 and 5 below, where Tables 1, 3 and 5 are parameter tables for each lens according to the first to third embodiments of the imaging lens of the present invention.

[0081] Figure 1 , 6 Figures 11 and 11 are schematic diagrams of lens configurations in the first, second, and third embodiments of the imaging lens of the present invention. Among them, the first lenses L11, L21, and L31 are meniscus lenses with negative refractive power, made of glass, with their object-side surfaces S11, S21, and S31 being convex surfaces and their image-side surfaces S12, S22, and S32 being concave surfaces. The object-side surfaces S11, S21, and S31 and the image-side surfaces S12, S22, and S32 are all spherical surfaces.

[0082] The second lenses L12, L22, and L32 have refractive power and are made of glass. Their object-side surfaces S13, S23, and S33 are convex, while their image-side surfaces S14, S24, and S34 are spherical.

[0083] The third lenses L13, L23, and L33 have refractive power and are made of glass. Their object side surfaces S14, S24, and S35, as well as their image side surfaces S15, S25, and S36, are all spherical surfaces.

[0084] The fourth lenses L14, L24, and L34 are biconcave lenses with negative refractive power, made of glass. Their object-side surfaces S17, S27, and S38 are concave, and their image-side surfaces S18, S28, and S39 are concave. Both the object-side surfaces S17, S27, and S38 and the image-side surfaces S18, S28, and S39 are aspherical surfaces.

[0085] The fifth lenses L15, L25, and L35 are biconvex lenses with positive refractive power. They are made of glass, with the object-side surfaces S18, S28, and S39 being convex and the image-side surfaces S19, S29, and S310 being convex. The object-side surfaces S18, S28, and S39, as well as the image-side surfaces S19, S29, and S310, are all spherical surfaces.

[0086] The fourth lenses L14, L24, and L34 are cemented together with the fifth lenses L15, L25, and L35, or there is no air gap between the fourth lenses L14, L24, and L34 and the fifth lenses L15, L25, and L35.

[0087] The sixth lenses L16, L26, and L36 are biconvex lenses with positive refractive power. They are made of glass, with their object-side surfaces S110, S210, and S311 being convex surfaces, and their image-side surfaces S111, S211, and S312 being convex surfaces. The object-side surfaces S110, S210, and S310, as well as the image-side surfaces S111, S211, and S312, are all spherical surfaces.

[0088] In addition, imaging lenses 1, 2, and 3 satisfy at least one of the following conditions (1) to (15):

[0089] -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4; (1)

[0090] 1.5 ≤ (Vd1+Vd2) / ∣Vd1-Vd2∣≤ 5.5; (2)

[0091] 2 ≤ (Vd2+Vd3) / ∣Vd2-Vd3∣≤ 2.7; (3)

[0092] 1.5 ≤ (Vd4+Vd5) / ∣Vd4-Vd5∣≤ 2.5; (4)

[0093] 0.7 ≤ f5 / f ≤ 1.1; (5)

[0094] 1.3 ≤ f6 / f ≤ 1.8; (6)

[0095] 10 mm ≤ f23 ≤ 16 mm; (7)

[0096] 1.5 mm ≤ T4 / Nd4 ≤ 1.9 mm; (8)

[0097] 3.6 mm ≤ BFL / Nd6 ≤ 4.1 mm; (9)

[0098] 1.11 ≤ BFL / f ≤ 1.21; (10)

[0099] 8.32 mm ≤ T4+T5+T6 ≤ 12.16 mm; (11)

[0100] 0.08 ≤ (R11 - R12) / TTL ≤ 0.31; (12)

[0101] 2.07 ≤ R42 / T4 ≤ 2.93; (13)

[0102] 304.47 ≤ TTL / d56 ≤ 318.48; (14)

[0103] 8.54 degrees / mm ≤ FOV / f ≤ 8.68 degrees / mm; (15)

[0104] In the first to third embodiments, the important parameters are defined as follows: f is the effective focal length of imaging lenses 1, 2, and 3; f5 is the effective focal length of the fifth lenses L15, L25, and L35; f6 is the effective focal length of the sixth lenses L16, L26, and L36; f23 is the effective focal length of the combination of the second lenses L12, L22, and L32 and the third lenses L13, L23, and L33; T4 is the distance between the object-side surfaces S17, S27, and S38 of the fourth lenses L14, L24, and L34 and the image-side surfaces S18, S28, and S39 of the fourth lenses L14, L24, and L34 on the optical axes OA1, OA2, and OA3; and T5 is the effective focal length of the fifth lenses L15, L25, and L36. The distances from the object-side surfaces S18, S28, S39 of the fifth lens L15, L25, L35 to the image-side surfaces S19, S29, S310 of the sixth lens L16, L26, L36 on the optical axes OA1, OA2, OA3; T6 is the distance from the object-side surfaces S110, S210, S310 of the sixth lens L16, L26, L36 to the image-side surfaces S111, S211, S312 of the sixth lens L16, L26, L36 on the optical axes OA1, OA2, OA3; R11 is the radius of curvature of the object-side surfaces S11, S21, S31 of the first lens L11, L21, L31; R12 is the radius of curvature of the image-side surfaces S12, S22, S32 of the first lens L11, L21, L31. R42 is the radius of curvature of the image-side surfaces S18, S28, and S39 of the fourth lenses L14, L24, and L34; d56 is the air gap between the image-side surfaces S19, S29, and S310 of the fifth lenses L15, L25, and L35 and the object-side surfaces S110, S210, and S311 of the sixth lenses L16, L26, and L36 on the optical axes OA1, OA2, and OA3; TTL is the distance between the object-side surfaces S11, S21, and S31 of the first lenses L11, L21, and L31 and the imaging planes IMA1, IMA2, and IMA3 on the optical axes OA1, OA2, and OA3; BFL is the distance between the image-side surfaces S111 and S211 of the sixth lenses L16, L26, and L36. S312 is the distance from the imaging planes IMA1, IMA2, and IMA3 on the optical axes OA1, OA2, and OA3. Vd1 is the Abbe coefficient of the first lens L11, L21, and L31. Vd2 is the Abbe coefficient of the second lens L12, L22, and L32. Vd3 is the Abbe coefficient of the third lens L13, L23, and L33. Vd4 is the Abbe coefficient of the fourth lens L14, L24, and L34. Vd5 is the Abbe coefficient of the fifth lens L15, L25, and L35. Nd4 is the refractive index of the fourth lens L14, L24, and L34. Nd6 is the refractive index of the sixth lens L16, L26, and L36. θ is the angle of view of imaging lenses 1, 2, and 3 at an image height of 3.304 mm. FOV is the field of view of imaging lenses 1, 2, and 3.This allows imaging lenses 1, 2, and 3 to effectively reduce the overall length of the lens, effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, and effectively correct aberrations.

[0105] When the following conditions are met: (1) -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4, (5) 0.7 ≤ f5 / f ≤ 1.1, (7) 10 mm ≤ f23 ≤ 16 mm, (10) 1.11 ≤ BFL / f ≤ 1.21, (11) 8.32 mm ≤ T4+T5+T6 ≤ 12.16 mm, (13) 2.07 ≤ R42 / T4 ≤ 2.93, (15) 8.54 degrees / mm ≤ FOV / f ≤ 8.68 degrees / mm, and the refractive power of the second and third lenses are opposite, the total length of the lens can be effectively shortened and good optical performance can be achieved.

[0106] When condition (1) is met: -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4, distortion can be effectively corrected. When condition (2) is met: 1.5 ≤ (Vd1+Vd2) / ∣Vd1-Vd2∣≤ 5.5, lateral chromatic aberration can be effectively corrected. When condition (3) is met: 2 ≤ (Vd2+Vd3) / ∣Vd2-Vd3∣≤ 2.7, lateral chromatic aberration can be effectively corrected. When condition (4) is met: 1.5 ≤ (Vd4+Vd5) / ∣Vd4-Vd5∣≤ 2.5, lateral chromatic aberration can be effectively corrected. When condition (5) is met: 0.7 ≤ f5 / f ≤ 1.1, the sensitivity of the fifth lens can be effectively reduced. When condition (6) is met: 1.3 ≤ f6 / f ≤ 1.8, the sensitivity of the sixth lens can be effectively reduced. When condition (7) is met: 10 mm ≤ f23 ≤ 16 mm, the sensitivity of the second and third lenses can be effectively reduced. When condition (8) is met: 1.5 mm ≤ T4 / Nd4 ≤ 1.9 mm, the field curvature of the peripheral field of view (sagittal direction) can be effectively reduced. When condition (9) is met: 3.6 mm ≤ BFL / Nd6 ≤ 4.1 mm, the field curvature of the peripheral field of view (sagittal direction) can be effectively reduced.

[0107] The first embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 1The imaging lens 1, along the optical axis OA1 from the object side to the image side, includes, in sequence, a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens L14, a fifth lens L15, a sixth lens L16, a filter OF1, and a protective glass CG1. During imaging, the light rays from the object side are finally imaged onto the imaging surface IMA1. According to paragraphs 1 to 10 of the [Implementation Method], wherein: the second lens L12 is a biconvex lens with positive refractive power, and its image-side surface S14 is convex; the third lens L13 is a biconcave lens with negative refractive power, and its object-side surface S14 is concave and its image-side surface S15 is concave; the second lens L12 and the third lens L13 are cemented together, or there is no air gap between the second lens L12 and the third lens L13; the filter OF1 has both its object-side surface S112 and its image-side surface S113 as flat surfaces; the protective glass CG1 has both its object-side surface S114 and its image-side surface S115 as flat surfaces; by utilizing the above-mentioned lens, aperture ST1 and the design that satisfies at least one of conditions (1) to (15), the imaging lens 1 can effectively reduce the total length of the lens, effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, and effectively correct aberrations. When the imaging lens 1 of the present invention satisfies only the conditions (1), (11) or (15) and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has refractive power, the fourth lens has a concave image side with negative refractive power, the fifth lens has a convex object side with positive refractive power, and the sixth lens has a convex object side with positive refractive power, the basic operation requirements can be achieved.

[0108] Table 1 is... Figure 1 Table of relevant parameters for each lens in imaging lens 1.

[0109]

[0110] Table 2 shows the relevant parameter values ​​of the imaging lens 1 in the first embodiment and the calculated values ​​of the corresponding conditions (1) to (15). As can be seen from Table 2, the imaging lens 1 in the first embodiment can meet the requirements of conditions (1) to (15).

[0111]

[0112] Furthermore, the optical performance of the imaging lens 1 in the first embodiment also meets the requirements. Figure 2 It can be seen that the longitudinal aberration of the imaging lens 1 in the first embodiment is between -0.02 mm and 0.08 mm. Figure 3 It can be seen that the field curvature of the imaging lens 1 in the first embodiment is between -0.02 mm and 0.03 mm. Figure 4 It can be seen that the distortion of the imaging lens 1 in the first embodiment is between -12% and 0%. Figure 5It can be seen that the lateral chromatic aberration of the imaging lens 1 in the first embodiment is between -1 μm and 3 μm. It is evident that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 1 in the first embodiment can be effectively corrected, thereby obtaining better optical performance.

[0113] The second embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 6 The imaging lens 2, along the optical axis OA2 from the object side to the image side, includes, in sequence, a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24, a fifth lens L25, a sixth lens L26, a filter OF2, and a protective glass CG2. During imaging, the light rays from the object side are finally imaged onto the imaging surface IMA2. According to paragraphs 1 to 10 of the [Specific Implementation], wherein: the second lens L22 is a meniscus lens with negative refractive power, and its image-side surface S24 is concave; the third lens L23 is a meniscus lens with positive refractive power, and its object-side surface S24 is convex, and its image-side surface S25 is concave; the second lens L22 and the third lens L23 are cemented together, or there is no air gap between the second lens L22 and the third lens L23; the object-side surface S212 and the image-side surface S213 of the filter OF2 are both planar; the object-side surface S214 and the image-side surface S215 of the protective glass CG2 are both planar; by utilizing the above-mentioned lens, aperture ST2 and the design that satisfies at least one of conditions (1) to (15), the imaging lens 2 can effectively reduce the total length of the lens, effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, and effectively correct aberrations. When the imaging lens 2 of the present invention satisfies only conditions (5), (7) or (10), and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has refractive power, the fourth lens has a concave image side with negative refractive power, the fifth lens has a convex object side with positive refractive power, and the sixth lens has a convex object side with positive refractive power, the basic operation requirements can be achieved.

[0114] Table 3 is... Figure 6 Table of relevant parameters for each lens in the imaging lens 2.

[0115]

[0116] Table 4 shows the relevant parameter values ​​of the imaging lens 2 in the second embodiment and the calculated values ​​of the corresponding conditions (1) to (15). As can be seen from Table 4, the imaging lens 2 in the second embodiment can meet the requirements of conditions (1) to (15).

[0117]

[0118] Furthermore, the optical performance of the imaging lens 2 in the second embodiment also meets the requirements. Figure 7It can be seen that the longitudinal aberration of the imaging lens 2 in the second embodiment is between -0.02 mm and 0.06 mm. Figure 8 It can be seen that the field curvature of the imaging lens 2 in the second embodiment is between -0.03 mm and 0.03 mm. Figure 9 It can be seen that the distortion of the imaging lens 2 in the second embodiment is between -12% and 0%. Figure 10 It can be seen that the lateral chromatic aberration of the imaging lens 2 in the second embodiment is between -1 μm and 4 μm. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 2 in the second embodiment can be effectively corrected, thereby achieving better optical performance.

[0119] The third embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 11 The imaging lens 3, along the optical axis OA3 from the object side to the image side, includes, in sequence, a first lens L31, a second lens L32, a third lens L33, an aperture ST3, a fourth lens L34, a fifth lens L35, a sixth lens L36, a filter OF3, and a protective glass CG3. During imaging, the light rays from the object side are finally imaged onto the imaging surface IMA3. According to paragraphs 1 to 10 of the [Specific Implementation], wherein: the second lens L32 is a meniscus lens with negative refractive power, and its image-side surface S34 is concave; the third lens L33 is a biconvex lens with positive refractive power, and its object-side surface S35 is convex, and its image-side surface S36 is convex; the filter OF3 has object-side surface S313 and image-side surface S314 both being planar; the protective glass CG3 has object-side surface S315 and image-side surface S316 both being planar; by utilizing the above-mentioned lens, aperture ST3 and the design that satisfies at least one of conditions (1) to (15), the imaging lens 3 can effectively reduce the total length of the lens, effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, and effectively correct aberrations. When the imaging lens 3 of the present invention satisfies only condition (12) or condition (13) and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has refractive power, the fourth lens has a concave image side with negative refractive power, the fifth lens has a convex object side with positive refractive power, and the sixth lens has a convex object side with positive refractive power, the basic operation requirements can be achieved.

[0120] Table 5 is... Figure 11 Table of relevant parameters for each lens in the imaging lens 3.

[0121]

[0122] Table 6 shows the relevant parameter values ​​of the imaging lens 3 in the third embodiment and the calculated values ​​of the corresponding conditions (1) to (15). As can be seen from Table 6, the imaging lens 3 in the third embodiment can meet the requirements of conditions (1) to (15).

[0123]

[0124] Furthermore, the optical performance of the imaging lens 3 in the third embodiment also meets the requirements. Figure 12 It can be seen that the longitudinal aberration of the imaging lens 3 in the third embodiment is between -0.01 mm and 0.05 mm. Figure 13 It can be seen that the field curvature of the imaging lens 3 in the third embodiment is between -0.04 mm and 0.01 mm. Figure 14 It can be seen that the distortion of the imaging lens 3 in the third embodiment is between -11% and 0%. Figure 15 It can be seen that the lateral chromatic aberration of the imaging lens 3 in the third embodiment is between -1 μm and 4 μm. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 3 in the third embodiment can be effectively corrected, thereby achieving better optical performance.

[0125] This invention provides an imaging lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens and including a convex surface facing the object side and a concave surface facing the image side; a second lens having refractive power; a third lens having refractive power, the third lens including a convex surface facing the object side; a fourth lens having refractive power, the fourth lens including a concave surface facing the object side; a fifth lens having refractive power, the fifth lens including a convex surface facing the image side; and a sixth lens having refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis from the object side to the image side; wherein the imaging lens satisfies at least one of the following conditions: 10 < (∣f6×R62∣). 0.5 / (T3) < 32; 19 mm < (R41×R62) 0.5 < 39 mm; where f6 is the effective focal length of the sixth lens, T3 is the distance between the object-side surface of the third lens and the image-side surface of the third lens on the optical axis, R41 is the radius of curvature of the object-side surface of the fourth lens, and R62 is the radius of curvature of the image-side surface of the sixth lens. A preferred embodiment of the present invention is one in which the imaging lens satisfies the above features and at least one of the conditions described above.

[0126] Please refer to Tables 7, 9, 11, 13 and 15 below, where Tables 7, 9, 11, 13 and 15 are parameter tables for each lens of the imaging lens according to the fourth to eighth embodiments of the present invention.

[0127] Figure 16 , 21Figures 22, 23, and 28 are schematic diagrams of lens configuration and optical path in the fourth, fifth, sixth, seventh, and eighth embodiments of the imaging lens of the present invention. The first lenses L41, L51, L61, L71, and L81 are meniscus lenses with negative refractive power, made of glass. Their object-side surfaces S41, S51, S61, S71, and S81 are convex, while their image-side surfaces S42, S52, S62, S72, and S82 are concave. Both the object-side surfaces S41, S51, S61, S71, and S81 and the image-side surfaces S42, S52, S62, S72, and S82 are spherical surfaces.

[0128] The second lenses L42, L52, L62, L72, and L82 have refractive power and are made of glass. Their object side surfaces S43, S53, S63, S73, and S83, and their image side surfaces S44, S54, S64, S74, and S84 are all spherical surfaces.

[0129] The third lenses L43, L53, L63, L73, and L83 have positive refractive power and are made of glass. Their object-side surfaces S45, S55, S65, S75, and S85 are convex, while their image-side surfaces S46, S56, S66, S76, and S86 are spherical.

[0130] The fourth lenses L44, L54, L64, L74, and L84 are biconcave lenses with negative refractive power, made of glass. Their object-side surfaces S48, S58, S68, S78, and S88 are concave, and their image-side surfaces S49, S59, S69, S79, and S89 are concave. Both the object-side surfaces S48, S58, S68, S78, and S88 and the image-side surfaces S49, S59, S69, S79, and S89 are spherical surfaces.

[0131] The fifth lenses L45, L55, L65, L75, and L85 are biconvex lenses with positive refractive power, made of glass. Their object-side surfaces S49, S59, S69, S79, and S89 are convex, and their image-side surfaces S410, S510, S610, S710, and S810 are convex. The object-side surfaces S49, S59, S69, S79, and S89, as well as the image-side surfaces S410, S510, S610, S710, and S810, are all spherical surfaces.

[0132] The fourth lenses L44, L54, L64, L74, L84 are cemented together with the fifth lenses L45, L55, L65, L75, L85, or there is no air gap between the fourth lenses L44, L54, L64, L74, L84 and the fifth lenses L45, L55, L65, L75, L85.

[0133] The sixth lenses L46, L56, L66, L76, and L86 are biconvex lenses with positive refractive power, made of glass. Their object-side surfaces S411, S511, S611, S711, and S811 are convex, and their image-side surfaces S412, S512, S612, S712, and S812 are convex. The object-side surfaces S411, S511, S611, S711, and S811, as well as the image-side surfaces S412, S512, S612, S712, and S812, are all spherical surfaces.

[0134] In addition, imaging lenses 4, 5, 6, 7, and 8 satisfy at least one of the following conditions (16) to (25):

[0135] -16 mm < (R11 / R41)×T5 < -1 mm; (16)

[0136] 12 mm < (R21×R62) 0.5 < 141 mm; (17)

[0137] 5 mm -1 < Vd1 / T1 < 118 mm -1 (18)

[0138] 10 < (∣f6×R62∣) 0.5 / (T3) < 32;(19)

[0139] -13 < (R11+R22) / T1 < 80; (20)

[0140] 41 mm < f5 / (T4 / T3) < 120 mm; (21)

[0141] 28 mm < (d12 / T2)×R42 < 53 mm; (22)

[0142] 25 mm < (R11-R62) / Nd2 < 88 mm; (23)

[0143] -45 mm 2 < (f2+f5)×T3 < 135 mm 2 ;(twenty four)

[0144] 19 mm < (R41×R62) 0.5 < 39 mm; (25)

[0145] In the fourth to eighth embodiments, the important parameters of imaging lenses 4, 5, 6, 7, and 8 are defined as follows: T1 is the distance between the object-side surfaces S41, S51, S61, S71, and S81 of the first lenses L41, L51, L61, L71, and L81 and the image-side surfaces S42, S52, S62, S72, and S82 of the first lenses L41, L51, L61, L71, and L81 on the optical axes OA4, OA5, OA6, OA7, and OA8; T2 is the distance between the object-side surfaces S43, S53, S63, S73, and S83 of the second lenses L42, L52, L62, L72, and L82 and the image-side surfaces S44, S54, and S63 of the second lenses L42, L52, L62, L72, and L82. 4. The distances of S74 and S84 on the optical axes OA4, OA5, OA6, OA7, and OA8; T3 is the distance from the object-side surfaces S45, S55, S65, S75, and S85 of the third lenses L43, L53, L63, L73, and L83 to the image-side surfaces S46, S56, S66, S76, and S86 on the optical axes OA4, OA5, OA6, OA7, and OA8; T4 is the distance from the object-side surfaces S48, S58, S68, S78, and S88 of the fourth lenses L44, L54, L64, L74, and L84 to the image-side surfaces S49, S59, S69, and S78. 9. The distance between S89 and the optical axes OA4, OA5, OA6, OA7, OA8; T5 is the distance between the object-side surfaces S49, S59, S69, S79, S89 of the fifth lenses L45, L55, L65, L75, L85 and the image-side surfaces S410, S510, S610, S710, S810 of the fifth lenses L45, L55, L65, L75, L85 and the optical axes OA4, OA5, OA6, OA7, OA8; R11 is the radius of curvature of the object-side surfaces S41, S51, S61, S71, S81 of the first lenses L41, L51, L61, L71, L81; R21 is the radius of curvature of the object-side surface S43 of the second lenses L42, L52, L62, L72, L82. R22 is the radius of curvature of the image-side surfaces S44, S54, S64, S74, and S84 of the second lenses L42, L52, L62, L72, and L82; R41 is the radius of curvature of the object-side surfaces S48, S58, S68, S78, and S88 of the fourth lenses L44, L54, L64, L74, and L84; R42 is the radius of curvature of the image-side surfaces S49, S59, S69, S79, and S89 of the fourth lenses L44, L54, L64, L74, and L84; and R62 is the radius of curvature of the image-side surfaces S412, S512, S612, S712, and S812 of the sixth lenses L46, L56, L66, L76, and L86.f2 is the effective focal length of the second lenses L42, L52, L62, L72, and L82; f5 is the effective focal length of the fifth lenses L45, L55, L65, L75, and L85; f6 is the effective focal length of the sixth lenses L46, L56, L66, L76, and L86; and d12 is the image-side surface S42, S52, S62, and S72 of the first lenses L41, L51, L61, L71, and L81. The air gaps between S82 and the object-side surfaces S43, S53, S63, S73, and S83 of the second lenses L42, L52, L62, L72, and L72 on the optical axes OA4, OA5, OA6, OA7, and OA8, respectively, where Vd1 is the Abbe coefficient of the first lenses L41, L51, L61, L71, and L81, and Nd2 is the refractive index of the second lenses L42, L52, L62, L72, and L82, allow imaging lenses 4, 5, 6, 7, and 8 to effectively reduce the overall lens length, effectively reduce the aperture value, effectively resist ambient temperature changes, and effectively correct aberrations.

[0146] When condition (16) is met: -16 mm < (R11 / R41)×T5 < -1 mm, aberrations can be effectively corrected and resolution improved. When condition (17) is met: 12 mm < (R21×R62) 0.5 < 141 mm can effectively correct aberrations and improve resolution. When condition (18): 5 mm is met. -1 < Vd1 / T1 < 118 mm -1 This can effectively correct aberrations and improve resolution. When condition (19) is met: 10 < (∣f6×R62∣) 0.5 / (T3) < 32, the effective focal length of the sixth lens, the radius of curvature of the image side of the sixth lens, and the thickness of the third lens can be effectively controlled to correct aberrations. When condition (20) is met: -13 < (R11+R22) / T1 < 80, the radius of curvature of the object side of the first lens, the radius of curvature of the image side of the second lens, and the thickness of the first lens can be effectively controlled to correct off-axis aberrations. When condition (21) is met: 41 mm < f5 / (T4 / T3) < 120 mm, the effective focal length of the fifth lens, the thickness of the fourth lens, and the thickness of the third lens can be effectively controlled to correct off-axis aberrations. When condition (22) is met: 28 mm < (d12 / T2)×R42 < 53 mm, the air gap between the first and second lenses, the thickness of the second lens, and the radius of curvature of the image side of the fourth lens can be effectively controlled to correct off-axis aberrations. When condition (23) is met: 25 mm < (R11-R62) / Nd2 < 88 mm, color difference can be effectively corrected and resolution improved. When condition (24) is met: -45 mm 2 < (f2+f5)×T3 < 135 mm2 This can effectively correct aberrations and improve resolution. When condition (25) is met: 19 mm < (R41×R62) 0.5 <39 mm, which can effectively correct aberrations and improve resolution.

[0147] The fourth embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 16 The imaging lens 4, along the optical axis OA4 from the object side to the image side, sequentially includes a first lens L41, a second lens L42, a third lens L43, an aperture ST4, a fourth lens L44, a fifth lens L45, a sixth lens L46, a filter OF4, and a protective glass CG4. The combined effective focal length of the second lens L42 and the third lens L43 is 9.68 mm. During imaging, the light rays from the object side are finally imaged onto the imaging plane IMA4. According to paragraphs one to nine of the [Implementation Method], wherein: the second lens L42 is a meniscus lens with negative refractive power, its object side S43 is concave and its image side S44 is convex; the third lens L43 is a biconvex lens, its image side S46 is convex; the filter OF4 has both its object side S413 and image side S414 as flat surfaces; the protective glass CG4 has both its object side S415 and image side S416 as flat surfaces; by utilizing the above-mentioned lens, aperture ST44 and the design that satisfies at least one of conditions (16) to (25), the imaging lens 4 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively resist ambient temperature, and effectively correct aberrations. When the imaging lens 4 of the present invention satisfies only condition (19) or condition (25) and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has a convex object side and refractive power, the fourth lens has a concave object side and refractive power, the fifth lens has a convex image side and refractive power, and the sixth lens has refractive power, the basic operation requirements can be achieved.

[0148] Table 7 is... Figure 16 Table of relevant parameters for each lens in the imaging lens 4.

[0149]

[0150] Table 8 shows the relevant parameter values ​​of the imaging lens 4 in the fourth embodiment and the calculated values ​​of the corresponding conditions (16) to (25). As can be seen from Table 8, the imaging lens 4 in the fourth embodiment can meet the requirements of conditions (16) to (25).

[0151]

[0152] Furthermore, the optical performance of the imaging lens 4 in the fourth embodiment also meets the requirements. Figure 17It can be seen that the longitudinal aberration of the imaging lens 4 in the fourth embodiment is between -0.06 mm and 0.03 mm. Figure 18 It can be seen that the field curvature of the imaging lens 4 in the fourth embodiment is between -0.04 mm and 0.03 mm. Figure 19 It can be seen that the distortion of the imaging lens 4 in the fourth embodiment is between -12% and 0%. Figure 20 It can be seen that the relative illumination of the imaging lens 4 in the fourth embodiment is between 0.83 and 1.0. Clearly, the longitudinal aberration, field curvature, and distortion of the imaging lens 4 in the fourth embodiment can be effectively corrected, thereby achieving better optical performance.

[0153] The fifth embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 21 The imaging lens 5, along the optical axis OA5 from the object side to the image side, sequentially includes a first lens L51, a second lens L52, a third lens L53, an aperture ST5, a fourth lens L54, a fifth lens L55, a sixth lens L56, a filter OF5, and a protective glass CG55. The combined effective focal length of the second lens L52 and the third lens L53 is 9.10 mm. During imaging, the light rays from the object side are finally imaged onto the imaging plane IMA5. Among them: the second lens L52 is a meniscus lens with negative refractive power, its object side S53 is concave and its image side S54 is convex; the third lens L53 is a biconvex lens, its image side S56 is convex; the filter OF2 has both its object side S513 and image side S514 as flat surfaces; the protective glass CG5 has both its object side S515 and image side S516 as flat surfaces; by utilizing the above-mentioned lens, aperture ST5 and the design that satisfies at least one of the conditions (16) to (25), the imaging lens 5 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively resist ambient temperature, and effectively correct aberrations. When the imaging lens 5 of the present invention satisfies only condition (4) or condition (25) and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has a convex object side and refractive power, the fourth lens has a concave object side and refractive power, the fifth lens has a convex image side and refractive power, and the sixth lens has refractive power, the basic operation requirements can be achieved.

[0154] Table 9 is... Figure 21 Table of relevant parameters for each lens in the imaging lens 5.

[0155]

[0156] Table 10 shows the relevant parameter values ​​of the imaging lens 5 in the fifth embodiment and the calculated values ​​of the corresponding conditions (16) to (25). As can be seen from Table 10, the imaging lens 5 in the fifth embodiment can meet the requirements of conditions (16) to (25).

[0157]

[0158] The sixth embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 22 The imaging lens 6, along the optical axis OA6 from the object side to the image side, sequentially includes a first lens L61, a second lens L62, a third lens L63, an aperture ST6, a fourth lens L64, a fifth lens L65, a sixth lens L66, a filter OF6, and a protective glass CG6. The combined effective focal length of the second lens L62 and the third lens L63 is 9.65 mm. During imaging, the light rays from the object side are finally imaged onto the imaging plane IMA6. According to paragraphs one to nine of the [Implementation Method], wherein: the second lens L62 is a meniscus lens with negative refractive power, its object side S63 is concave and its image side S64 is convex; the third lens L63 is a biconvex lens, its image side S66 is convex; the filter OF6 has both its object side S613 and image side S614 as flat surfaces; the protective glass CG6 has both its object side S615 and image side S616 as flat surfaces; by utilizing the above-mentioned lens, aperture ST6 and the design that satisfies at least one of conditions (16) to (25), the imaging lens 6 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively resist ambient temperature, and effectively correct aberrations. When the imaging lens 6 of the present invention satisfies only condition (19) or condition (25) and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has a convex object side and refractive power, the fourth lens has a concave object side and refractive power, the fifth lens has a convex image side and refractive power, and the sixth lens has refractive power, the basic operation requirements can be achieved.

[0159] Table 11 is... Figure 22 Table of relevant parameters for each lens in the imaging lens 6.

[0160]

[0161] Table 12 shows the relevant parameter values ​​of the imaging lens 6 in the sixth embodiment and the calculated values ​​of the corresponding conditions (16) to (25). As can be seen from Table 12, the imaging lens 6 in the sixth embodiment can meet the requirements of conditions (16) to (25).

[0162]

[0163] The seventh embodiment of the imaging lens of the present invention will now be described in detail. Please refer to [link to relevant documentation]. Figure 23The imaging lens 7, along the optical axis OA7 from the object side to the image side, sequentially includes a first lens L71, a second lens L72, a third lens L73, an aperture ST7, a fourth lens L74, a fifth lens L75, a sixth lens L76, a filter OF7, and a protective glass CG7. The combined effective focal length of the second lens L72 and the third lens L73 is 14.88 mm. During imaging, the light rays from the object side are finally imaged onto the imaging plane IMA7. According to paragraphs one to nine of the [Implementation Method], wherein: the second lens L72 is a meniscus lens with negative refractive power, its object side S73 is convex and its image side S74 is concave; the third lens L73 is a plano-convex lens, its image side S76 is flat; the filter OF7 has both its object side S713 and image side S714 as flat; the protective glass CG4 has both its object side S715 and image side S716 as flat; by utilizing the above-mentioned lens, aperture ST7 and the design that satisfies at least one of conditions (16) to (25), the imaging lens 7 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively resist ambient temperature, and effectively correct aberrations. When the imaging lens 7 of the present invention satisfies only condition (19) or condition (25) and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has a convex object side and refractive power, the fourth lens has a concave object side and refractive power, the fifth lens has a convex image side and refractive power, and the sixth lens has refractive power, the basic operation requirements can be achieved.

[0164] Table 13 is... Figure 23 Table of relevant parameters for each lens in the imaging lens 7.

[0165]

[0166] Table 14 shows the relevant parameter values ​​of the imaging lens 7 in the seventh embodiment and the calculated values ​​of the corresponding conditions (16) to (25). As can be seen from Table 14, the imaging lens 7 in the seventh embodiment can meet the requirements of conditions (16) to (25).

[0167]

[0168] Furthermore, the optical performance of the imaging lens 7 in the seventh embodiment also meets the requirements. Figure 24 It can be seen that the longitudinal aberration of the imaging lens 7 in the seventh embodiment is between -0.05 mm and 0.03 mm. Figure 25 It can be seen that the field curvature of the imaging lens 7 in the seventh embodiment is between -0.04 mm and 0.06 mm. Figure 26 It can be seen that the distortion of the imaging lens 7 in the seventh embodiment is between -9% and 0%. Figure 27It can be seen that the relative illumination of the imaging lens 7 in the seventh embodiment is between 0.90 and 1.0. Clearly, the longitudinal aberration, field curvature, and distortion of the imaging lens 7 in the seventh embodiment can be effectively corrected, thereby achieving better optical performance.

[0169] The eighth embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 28 The imaging lens 8, along the optical axis OA8 from the object side to the image side, sequentially includes a first lens L81, a second lens L82, a third lens L83, an aperture ST8, a fourth lens L84, a fifth lens L85, a sixth lens L86, a filter OF8, and a protective glass CG8. The combined effective focal length of the second lens L82 and the third lens L83 is 15.01 mm. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA8. According to paragraphs 1 to 9 of the [Implementation Method], wherein: the second lens L82 is a biconvex lens with positive refractive power, its object side S83 is convex, and its image side S84 is convex; the third lens L83 is a meniscus lens, its image side S86 is concave; the filter OF8 has both its object side S813 and image side S814 as flat surfaces; the protective glass CG8 has both its object side S815 and image side S816 as flat surfaces; by utilizing the above-mentioned lens, aperture ST8 and the design that satisfies at least one of conditions (16) to (25), the imaging lens 8 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively resist ambient temperature, and effectively correct aberrations. When the imaging lens 8 of the present invention satisfies only condition (19) or condition (25) and the first lens has a convex object side and a concave image side with negative refractive power, the second lens has refractive power, the third lens has a convex object side and refractive power, the fourth lens has a concave object side and refractive power, the fifth lens has a convex image side and refractive power, and the sixth lens has refractive power, the basic operation requirements can be achieved.

[0170] Table 15 is... Figure 28 Table of relevant parameters for each lens in the imaging lens 8.

[0171]

[0172] Table 16 shows the relevant parameter values ​​of the imaging lens 8 in the eighth embodiment and the calculated values ​​of the corresponding conditions (16) to (25). As can be seen from Table 16, the imaging lens 8 in the eighth embodiment can meet the requirements of conditions (16) to (25).

[0173]

[0174] Furthermore, the optical performance of the imaging lens 8 in the eighth embodiment also meets the requirements. Figure 29 It can be seen that the longitudinal aberration of the imaging lens 8 in the eighth embodiment is between -0.04 mm and 0.015 mm. Figure 30 It can be seen that the field curvature of the imaging lens 8 in the eighth embodiment is between -0.03 mm and 0.04 mm. Figure 31 It can be seen that the distortion of the imaging lens 8 in the eighth embodiment is between -12% and 0%. Figure 32 It can be seen that the relative illumination of the imaging lens 8 in the eighth embodiment is between 0.88 and 1.0. Clearly, the longitudinal aberration, field curvature, and distortion of the imaging lens 8 in the eighth embodiment can be effectively corrected, thereby achieving better optical performance.

Claims

1. An imaging lens, characterized in that, include: The first lens has negative refractive power. The first lens is a meniscus lens and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has refractive power; The third lens has refractive power; The fourth lens has negative refractive power and includes a concave surface facing the object side; The fifth lens has positive refractive power and includes a convex surface facing the image side; and The sixth lens has positive refractive power and includes a convex surface facing the object side; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis from the object side to the image side; The imaging lens satisfies at least one of the following conditions: -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4; 0.7 ≤ f5 / f ≤ 1.1; 10 mm ≤ f23 ≤ 16 mm; 1.11 ≤ BFL / f ≤ 1.21; 8.32 mm ≤ T4+T5+T6 ≤ 12.16 mm; 2.07 ≤ R42 / T4 ≤ 2.93; 8.54 degrees / mm ≤ FOV / f ≤ 8.68 degrees / mm; 10 < (∣f6×R62∣)0.5 / (T3) < 32; 41 mm < f5 / (T4 / T3) < 120 mm; Where f is the effective focal length of the imaging lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f23 is the effective focal length of the combination of the second and third lenses, T3 is the distance between the object-side surface of the third lens and the image-side surface of the third lens on the optical axis, T4 is the distance between the object-side surface of the fourth lens and the image-side surface of the fourth lens on the optical axis, T5 is the distance between the object-side surface of the fifth lens and the image-side surface of the fifth lens on the optical axis, T6 is the distance between the object-side surface of the sixth lens and the image-side surface of the sixth lens on the optical axis, R42 is the radius of curvature of the image-side surface of the fourth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, TTL is the distance between the object-side surface of the first lens and the imaging plane on the optical axis, BFL is the distance between the image-side surface of the sixth lens and the imaging plane on the optical axis, θ is the angle of view of the imaging lens at an image height of 3.304 mm, and FOV is the field of view of the imaging lens.

2. The imaging lens as described in claim 1, characterized in that, The second lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; The third lens has negative refractive power and includes a concave surface facing the object side and a concave surface facing the image side; The fourth lens includes a concave surface facing the image side; The fifth lens includes a convex surface facing the object; The sixth lens includes a convex surface facing the image side.

3. The imaging lens as described in claim 1, characterized in that, The second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; The third lens has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side; The fourth lens includes a concave surface facing the image side; The fifth lens includes a convex surface facing the object; The sixth lens includes a convex surface facing the image side.

4. The imaging lens as described in claim 1, characterized in that, The second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; The third lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; The fourth lens includes a concave surface facing the image side; The fifth lens includes a convex surface facing the object; The sixth lens includes a convex surface facing the image side.

5. The imaging lens as described in claim 1, characterized in that, The second lens has negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side; The third lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; The fourth lens includes a concave surface facing the image side; The fifth lens includes a convex surface facing the object; The sixth lens includes a convex surface facing the image side.

6. The imaging lens as described in claim 1, characterized in that, The second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; The third lens has positive refractive power and includes a convex surface facing the object side and a flat surface facing the image side; The fourth lens includes a concave surface facing the image side; The fifth lens includes a convex surface facing the object; The sixth lens includes a convex surface facing the image side.

7. The imaging lens as described in claim 1, characterized in that, The second lens has positive refractive power and includes a convex surface facing the object side and a convex surface facing the image side; The third lens has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side; The fourth lens includes a concave surface facing the image side; The fifth lens includes a convex surface facing the object; The sixth lens includes a convex surface facing the image side.

8. The imaging lens as described in any one of claims 1 to 7, characterized in that, The imaging lens satisfies at least one of the following conditions: 1.5 ≤ (Vd1+Vd2) / ∣Vd1-Vd2∣≤ 5.5; 2 ≤ (Vd2+Vd3) / ∣Vd2-Vd3∣≤ 2.7; 1.5 ≤ (Vd4+Vd5) / ∣Vd4-Vd5∣≤ 2.5; 1.3 ≤ f6 / f ≤ 1.8; 1.5 mm ≤ T4 / Nd4 ≤ 1.9 mm; 3.6 mm ≤ BFL / Nd6 ≤ 4.1 mm; 0.08 ≤ (R11-R12) / TTL ≤ 0.31; 304.47 ≤ TTL / d56 ≤ 318.48; -16 mm < (R11 / R41)×T5 < -1 mm; 12 mm < (R21×R62) 0.5 < 141 mm; 5mm -1 < Vd1 / T1 < 118 mm -1 ; -13 < (R11+R22) / T1 < 80; 28 mm < (d12 / T2)×R42 < 53 mm; 25 mm < (R11-R62) / Nd2 < 88 mm; -45 mm 2 < (f2+f5)×T3 < 135 mm 2 ; 19 mm < (R41×R62) 0.5 < 39 mm; Where f is the effective focal length of the imaging lens, f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, T1 is the distance between the object-side surface of the first lens and the image-side surface of the first lens on the optical axis, T2 is the distance between the object-side surface of the second lens and the image-side surface of the second lens on the optical axis, T3 is the distance between the object-side surface of the third lens and the image-side surface of the third lens on the optical axis, T4 is the distance between the object-side surface of the fourth lens and the image-side surface of the fourth lens on the optical axis, T5 is the distance between the object-side surface of the fifth lens and the image-side surface of the fifth lens on the optical axis, R11 is the radius of curvature of the object-side surface of the first lens, R12 is the radius of curvature of the image-side surface of the first lens, R21 is the radius of curvature of the object-side surface of the second lens, R22 is the radius of curvature of the image-side surface of the second lens, and R41 is... The radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, d12 is the air gap on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens, d56 is the air gap on the optical axis between the image-side surface of the fifth lens and the object-side surface of the sixth lens, TTL is the distance on the optical axis between the object-side surface of the first lens and the imaging plane, BFL is the distance on the optical axis between the image-side surface of the sixth lens and the imaging plane, Vd1 is the Abbe coefficient of the first lens, Vd2 is the Abbe coefficient of the second lens, Vd3 is the Abbe coefficient of the third lens, Vd4 is the Abbe coefficient of the fourth lens, Vd5 is the Abbe coefficient of the fifth lens, Nd2 is the refractive index of the second lens, Nd4 is the refractive index of the fourth lens, and Nd6 is the refractive index of the sixth lens.

9. An imaging lens, characterized in that, include: The first lens has negative refractive power. The first lens is a meniscus lens and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has positive refractive power; The third lens has negative refractive power; The fourth lens has negative refractive power and includes a concave surface facing the object side; The fifth lens has positive refractive power and includes a convex surface facing the image side; and The sixth lens has positive refractive power and includes a convex surface facing the object side; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis from the object side to the image side.

10. The imaging lens as described in claim 9, characterized in that, The second lens is a biconvex lens, and includes one convex surface facing the object side and another convex surface facing the image side; The third lens is a biconcave lens, and includes one concave surface facing the object side and another concave surface facing the image side; The fourth lens is a biconcave lens, and further includes another concave surface facing the image side; The fifth lens is a biconvex lens, and further includes another convex surface facing the object side; The sixth lens is a biconvex lens, and further includes another convex surface facing the image side; The second lens is cemented to the third lens, or there is no air gap between the second lens and the third lens; and The fourth lens is cemented to the fifth lens, or there is no air gap between the fourth lens and the fifth lens.

11. The imaging lens as described in any one of claims 9 to 10, characterized in that, The imaging lens satisfies at least one of the following conditions: -3 ≤ (3.304-f × tan(θ)) × TTL / ( f × tan(θ)) ≤ -2.4; 1.5 ≤ (Vd1+Vd2) / ∣Vd1-Vd2∣≤ 5.5; 2 ≤ (Vd2+Vd3) / ∣Vd2-Vd3∣≤ 2.7; 1.5 ≤ (Vd4+Vd5) / ∣Vd4-Vd5∣≤ 2.5; 0.7 ≤ f5 / f ≤ 1.1; 1.3 ≤ f6 / f ≤ 1.8; 10 mm ≤ f23 ≤ 16 mm; 1.5 mm ≤ T4 / Nd4 ≤ 1.9 mm; 3.6 mm ≤ BFL / Nd6 ≤ 4.1 mm; 1.11 ≤ BFL / f ≤ 1.21; 8.32 mm ≤ T4+T5+T6 ≤ 12.16 mm; 0.08 ≤ (R11-R12) / TTL ≤ 0.31; 2.07 ≤ R42 / T4 ≤ 2.93; 304.47 ≤ TTL / d56 ≤ 318.48; 8.54 degrees / mm ≤ FOV / f ≤ 8.68 degrees / mm; -16 mm < (R11 / R41)×T5 < -1 mm; 12 mm < (R21×R62) 0.5 < 141 mm; 5mm -1 < Vd1 / T1 < 118 mm -1 ; 10 < (∣f6×R62∣) 0.5 / (T3) < 32; -13 < (R11+R22) / T1 < 80; 41 mm < f5 / (T4 / T3) < 120 mm; 28 mm < (d12 / T2)×R42 < 53 mm; 25 mm < (R11-R62) / Nd2 < 88 mm; -45 mm 2 < (f2+f5)×T3 < 135 mm 2 ; 19 mm < (R41×R62) 0.5 < 39 mm; Where f is the effective focal length of the imaging lens, f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f23 is the effective focal length of the combination of the second and third lenses, T1 is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the first lens, T2 is the distance on the optical axis from the object-side surface of the second lens to the image-side surface of the second lens, T3 is the distance on the optical axis from the object-side surface of the third lens to the image-side surface of the third lens, T4 is the distance on the optical axis from the object-side surface of the fourth lens to the image-side surface of the fourth lens, T5 is the distance on the optical axis from the object-side surface of the fifth lens to the image-side surface of the fifth lens, T6 is the distance on the optical axis from the object-side surface of the sixth lens to the image-side surface of the sixth lens, R11 is the radius of curvature of the object-side surface of the first lens, R12 is the radius of curvature of the image-side surface of the first lens, and R21 is the radius of curvature of the object-side surface of the second lens. R22 is the radius of curvature of the image-side surface of the second lens, R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, d12 is the air gap on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens, d56 is the air gap on the optical axis between the image-side surface of the fifth lens and the object-side surface of the sixth lens, and TTL is the radius of curvature of the image-side surface of the first lens. The distance from the object side to the imaging plane on the optical axis, BFL is the distance from the image side to the imaging plane of the sixth lens on the optical axis, Vd1 is the Abbe coefficient of the first lens, Vd2 is the Abbe coefficient of the second lens, Vd3 is the Abbe coefficient of the third lens, Vd4 is the Abbe coefficient of the fourth lens, Vd5 is the Abbe coefficient of the fifth lens, Nd4 is the refractive index of the fourth lens, Nd6 is the refractive index of the sixth lens, θ is the angle of view of the imaging lens at an image height of 3.304 mm, and FOV is the field of view of the imaging lens.

Images