Lens assembly

Abstract

A lens assembly 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. Further, the first lens includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with refractive power. The third lens is with refractive power. The fourth lens is with negative refractive power. Further, the fourth lens includes a concave surface facing the object side. The fifth lens is with positive refractive power. Further, the fifth lens includes a convex surface facing the image side. The sixth lens is with positive refractive power. Further, 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 from the object side to the image side along an optical axis.

Description

Technical Field

[0001] This invention relates to an imaging lens. Prior 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 the need to capture 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, small aperture value, and the ability to capture clear images both day and night.

[0004] This invention provides an imaging lens comprising 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 includes a concave surface facing the object side. The fifth lens has positive refractive power and includes a convex surface facing the image side. 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 an 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; 10mm f23 16mm; 0.16 BFL / f 0.23; 8.32mm T4+T5+T6 12.16mm; 0.08 (R11-R12) / TTL 0.31:2.07 R42 / T4 2.93;8.54 degrees / mm FOV / f 8.68 degrees / mm; where f is the effective focal length of one of the imaging lenses, f5 is the effective focal length of one of the fifth lenses, f23 is the effective focal length of the combination of the second and fifth lenses, T4 is the distance on the optical axis from the object side to the image side of the fourth lens, T5 is the distance on the optical axis from the object side to the image side of the fifth lens, T6 is the distance on the optical axis from the object side to the image side of the sixth lens, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, R42 is the radius of curvature of the image side of the fourth lens, TTL is the distance on the optical axis from the object side of the first lens to an imaging plane, BFL is the distance on the optical axis from the image side of the sixth lens to the imaging plane, θ is the angle of view of the imaging lens at an image height of 3.304mm, and FOV is the field of view of the imaging lens. When the imaging lens of the present invention satisfies the above-mentioned features and at least one of the conditions, and no other additional conditions or features are required, the basic function of the imaging lens of the present invention can be achieved.

[0005] The second lens has negative refractive power, and the third lens has positive refractive power.

[0006] The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; the third lens includes a convex surface facing the object side; the fourth lens is a biconcave lens and may further include another concave surface facing the image side; the fifth lens is a biconvex lens and may further include another convex surface facing the object side; the sixth lens is a biconvex lens and may further include a convex surface facing the image side; 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.

[0007] The third lens is a meniscus lens and may further include a concave surface facing the image side; and the second lens and the third lens are cemented together, or there is no air gap between the second lens and the third lens.

[0008] The third lens is a biconvex lens, and may further include a convex surface facing the image side.

[0009] 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; 1.5mm T4 / Nd4 1.9mm; 3.6mm BFL / Nd6 4.1mm; 304.47 TTL / d56 318.48; where f6 is the effective focal length of the sixth lens, f is the effective focal length of the imaging lens, T4 is the distance from the object side of the fourth lens to the image side of the fourth 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, TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, BFL is the distance from the image side of the sixth lens to the imaging plane on the optical axis, and d56 is the air gap from the image side of the fifth lens to the object side of the sixth lens on the optical axis.

[0010] This invention provides another imaging lens comprising 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 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. The sixth lens has positive refractive power and includes a convex surface facing the object side. The first, second, third, fourth, fifth, and sixth lenses are arranged sequentially along an optical axis from the object side to the image side. When the imaging lens of this invention satisfies the above features, and no other additional conditions or features are required, the basic function of the imaging lens of this invention can be achieved.

[0011] The second lens is a biconvex lens, comprising a convex surface facing the object side and another convex surface facing the image side; the third lens is a biconcave lens, comprising a concave surface facing the object side and another concave surface facing the image side; the fourth lens is a biconcave lens, and may further include another concave surface facing the image side; the fifth lens is a biconvex lens, and may further include another convex surface facing the object side; the sixth lens is a biconvex lens, and may further include 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.

[0012] 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; 0.7 f5 / f 1.1; 10mm f23 16mm; 1.5mm T4 / Nd4 1.9mm; 3.6mm BFL / Nd6 4.1mm; 0.16 BFL / f 0.23; 8.32mm T4+T5+T6 12.16mm; 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;2 (Vd2+Vd3) / |Vd2-Vd3| 2.7; 1.5 (Vd4+Vd5) / |Vd4-Vd5| 2.5; 1.3 f6 / f 1.8; where f is the effective focal length of one of the imaging lenses, f5 is the effective focal length of one of the fifth lenses, f6 is the effective focal length of one of the sixth lenses, f23 is the effective focal length of the combination of the second and third lenses, T4 is the distance on the optical axis from the object side to the image side of the fourth lens, T5 is the distance on the optical axis from the object side to the image side of the fifth lens, T6 is the distance on the optical axis from the object side to the image side of the sixth lens, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, R42 is the radius of curvature of the image side of the fourth lens, and d56 is the distance on the optical axis from the image side of the fifth lens to the object side of the sixth lens. The air gap is defined as follows: TTL is the distance from the object side of the first lens to the imaging plane on the optical axis; BFL is the distance from the image side of the sixth lens to the imaging plane 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 corresponding to an image height of 3.304 mm; and FOV is the field of view of the imaging lens.

[0013] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Simple Explanation of the Diagram

[0014] Figures 1, 6, and 11 are schematic diagrams of lens configurations according to the first, second, and third embodiments of the imaging lens of the present invention, respectively.

[0015] Figures 2, 3, 4, and 5 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.

[0016] Figures 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.

[0017] Figures 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. Implementation

[0018] 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 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 an 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 16mm; 0.16 BFL / f 0.23; 8.32mm T4+T5+T6 12.16mm; 0.08 (R11-R12) / TTL 0.31; 2.07 R42 / T4 2.93;8.54 degrees / mm FOV / f 8.68 degrees / mm; where f is the effective focal length of one of the imaging lenses, f5 is the effective focal length of one of the fifth lenses, f23 is the effective focal length of the combination of the second and fifth lenses, T4 is the distance on the optical axis from the object side to the image side of the fourth lens, T5 is the distance on the optical axis from the object side to the image side of the fifth lens, T6 is the distance on the optical axis from the object side to the image side of the sixth lens, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, R42 is the radius of curvature of the image side of the fourth lens, TTL is the distance on the optical axis from the object side of the first lens to an imaging plane, BFL is the distance on the optical axis from the image side of the sixth lens to the imaging plane, θ is the angle of view of the imaging lens at an image height of 3.304mm, 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.

[0019] The present 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 an object side and a concave surface facing an 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 an optical axis from the object side to the image side. When the imaging lens of the present invention satisfies the above features, it is a preferred embodiment of the present invention.

[0020] Please refer to Tables 1, 3 and 5 below, where Tables 1, 3 and 5 are the relevant parameter tables for each lens of the first to third embodiments of the imaging lens according to the present invention.

[0021] Figures 1, 6, and 11 are schematic diagrams of lens configurations for the first, second, and third embodiments of the imaging lens of the present invention, respectively. The first lenses L11, L21, and L31 are meniscus lenses with negative refractive power, made of glass. Their object-side surfaces S11, S21, and S31 are convex, and their image-side surfaces S12, S22, and S32 are concave. Both the object-side surfaces S11, S21, and S31 and the image-side surfaces S12, S22, and S32 are spherical surfaces.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In addition, imaging lenses 1, 2, and 3 satisfy at least one of the following conditions (1) to (15):

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

[0043] In the first to third embodiments, the important parameters are defined as follows: f is the effective focal length of one of the imaging lenses 1, 2, and 3; f5 is the effective focal length of one of the fifth lenses L15, L25, and L35; f6 is the effective focal length of one of the sixth lenses L16, L26, and L36; f23 is the effective focal length of a combination of the second lenses L12, L22, and L32 and the third lenses L13, L23, and L33; and T4 is the object-side surface S17, S27, and S38 of the fourth lenses L14, L24, and L34. The distance between the image sides S18, S28, and S39 of L34 and the optical axes OA1, OA2, and OA3; T5 is the distance between the object sides S18, S28, and S39 of the fifth lenses L15, L25, and L35 and the image sides S19, S29, and S310 of the fifth lenses L15, L25, and L35 and the optical axes OA1, OA2, and OA3; T6 is the distance between the object sides S110, S210, and S310 of the sixth lenses L16, L26, and L36 and the image side S111 of the sixth lenses L16, L26, and L36. S211 and S312 are a distance between each other on the optical axes OA1, OA2, and OA3. R11 is a radius of curvature of the object-side surfaces S11, S21, and S31 of the first lenses L11, L21, and L31. R12 is a radius of curvature of the image-side surfaces S12, S22, and S32 of the first lenses L11, L21, and L31. R42 is a radius of curvature of the image-side surfaces S18, S28, and S39 of the fourth lenses L14, L24, and L34. d56 The TTL is the air gap between the image sides S19, S29, S310 of the fifth lenses L15, L25, L35 and the object sides S110, S210, S311 of the sixth lenses L16, L26, L36 on the optical axes OA1, OA2, OA3. The distance BFL is the distance from the image sides S111, S211, S312 of the sixth lenses L16, L26, L36 to the imaging planes IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3; Vd1 is one Abbe coefficient of the first lenses L11, L21, L31; Vd2 is one Abbe coefficient of the second lenses L12, L22, L32; and Vd3 is one Abbe coefficient of the third lenses L13, L23, L33. The coefficients are: Vd4 is one of the Abbe coefficients of the fourth lens L14, L24, and L34; Vd5 is one of the Abbe coefficients of the fifth lens L15, L25, and L35; Nd4 is one of the refractive indices of the fourth lens L14, L24, and L34; Nd6 is one of the refractive indices of the sixth lens L16, L26, and L36; θ is one of the drawing angles corresponding to an image height of 3.304mm for imaging lenses 1, 2, and 3; and FOV is one of the full fields of view for imaging lenses 1, 2, and 3.This allows imaging lenses 1, 2, and 3 to effectively reduce the overall lens length, effectively increase the field of view, effectively decrease the aperture value, effectively improve resolution, and effectively correct aberrations.

[0044] When condition (1):-3 is met (3.304-f×tan(θ))×TTL / (f×tan(θ)) -2.4, Condition (5): 0.7 f5 / f 1.1, Condition (7): 10mm f23 16mm, Condition (10): 0.16 BFL / f 0.23, Condition (11): 8.32mm T4+T5+T6 12.16mm, Condition (12): 0.08 (R11-R12) / TTL 0.31, Condition (13): 2.07 R42 / T4 2.93, condition (15): 8.54 degrees / mm FOV / f With a refractive power of 8.68 degrees / mm and opposite refractive powers between the second and third lenses, the overall length of the lens can be effectively shortened while maintaining good optical performance.

[0045] When condition (1):-3 is met (3.304-f×tan(θ))×TTL / (f×tan(θ)) -2.4 can effectively correct distortion. When condition (2): 1.5 is met. (Vd1+Vd2) / |Vd1-Vd2| 5.5 can effectively correct lateral color differences. When condition (3):2 is met. (Vd2+Vd3) / |Vd2-Vd3| 2.7, can effectively correct lateral color difference. When condition (4): 1.5 is met. (Vd4+Vd5) / |Vd4-Vd5| 2.5 can effectively correct lateral color differences. When condition (5): 0.7 is met. f5 / f 1.1, can effectively reduce the sensitivity of the fifth lens. When condition (6): 1.3 is met. f6 / f 1.8 can effectively reduce the sensitivity of the sixth lens. When condition (7): 10mm is met. f23 16mm can effectively reduce the sensitivity of the second and third lenses. When condition (8): 1.5mm is met. T4 / Nd4 1.9mm can effectively reduce the field curvature of the peripheral field of view (sagittal direction). When condition (9) is met: 3.6mm BFL / Nd6 With a thickness of 4.1mm, it can effectively reduce the field curvature of the peripheral field of view (sagittal direction).

[0046] The first embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 1, the imaging lens 1 includes, along an optical axis OA1 from the object side to the image side, 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 from the object side is finally imaged onto an imaging plane 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.

[0047] Table 1 shows the relevant parameters of each lens in imaging lens 1 in Figure 1.

[0048]

[0049] Table 2 shows the relevant parameter values ​​of the imaging lens 1 of 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 of the first embodiment can meet the requirements of conditions (1) to (15).

[0050]

[0051] Furthermore, the optical performance of the imaging lens 1 in the first embodiment also meets the requirements. As shown in Figure 2, the longitudinal aberration of the imaging lens 1 in the first embodiment is between -0.02 mm and 0.08 mm. As shown in Figure 3, the field curvature of the imaging lens 1 in the first embodiment is between -0.02 mm and 0.03 mm. As shown in Figure 4, the distortion of the imaging lens 1 in the first embodiment is between -12% and 0%. As shown in Figure 5, the lateral chromatic aberration of the imaging lens 1 in the first embodiment is between -1 μm and 3 μm. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 1 in the first embodiment can be effectively corrected, thereby achieving better optical performance.

[0052] The second embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 6, the imaging lens 2, along an optical axis OA2 from the object side to the image side, sequentially includes 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, light rays from the object side are finally imaged onto an imaging plane IMA2. According to paragraphs 1 to 10 of the [Implementation Method], 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.

[0053] Table 3 shows the relevant parameters of each lens in imaging lens 2 in Figure 6.

[0054]

[0055] 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).

[0056]

[0057] Furthermore, the optical performance of the imaging lens 2 in the second embodiment also meets the requirements. As shown in Figure 7, the longitudinal aberration of the imaging lens 2 in the second embodiment is between -0.02 mm and 0.06 mm. As shown in Figure 8, the field curvature of the imaging lens 2 in the second embodiment is between -0.03 mm and 0.03 mm. As shown in Figure 9, the distortion of the imaging lens 2 in the second embodiment is between -12% and 0%. As shown in Figure 10, 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.

[0058] The third embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 11, the imaging lens 3, along an optical axis OA3 from the object side to the image side, sequentially includes 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, light rays from the object side are finally imaged onto an imaging surface IMA3. According to paragraphs 1 to 10 of the [Implementation Method], 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.

[0059] Table 5 shows the relevant parameters of each lens in imaging lens 3 in Figure 11.

[0060]

[0061] Table 6 shows the relevant parameter values ​​of the imaging lens 3 of 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 of the third embodiment can meet the requirements of conditions (1) to (15).

[0062]

[0063] Furthermore, the optical performance of the imaging lens 3 in the third embodiment also meets the requirements. As shown in Figure 12, the longitudinal aberration of the imaging lens 3 in the third embodiment is between -0.01 mm and 0.05 mm. As shown in Figure 13, the field curvature of the imaging lens 3 in the third embodiment is between -0.04 mm and 0.01 mm. As shown in Figure 14, the distortion of the imaging lens 3 in the third embodiment is between -11% and 0%. As shown in Figure 15, 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.

[0064] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

[0065] 1, 2, 3: Imaging lenses

[0066] L11, L21, L31: First lens

[0067] L12, L22, L32: Second lenses

[0068] L13, L23, L33: Third lens

[0069] ST1, ST2, ST3: Aperture

[0070] L14, L24, L34: Fourth lens

[0071] L15, L25, L35: Fifth lens

[0072] L16, L26, L36: Sixth lens

[0073] OF1, OF2, OF3: Filters

[0074] CG1, CG2, CG3: Protective Glass

[0075] IMA1, IMA2, IMA3: Imaging plane

[0076] OA1, OA2, OA3: Optical axis

[0077] S11, S21, S31: Side surface of the first lens

[0078] S12, S22, S32: Side view of the first lens

[0079] S13, S23, S33: Side surface of the second lens

[0080] S14, S24, S34: Side view of the second lens

[0081] S14, S24, S35: Side of the third lens

[0082] S15, S25, S36: Side view of the third lens

[0083] S17, S27, S38: Side view of the fourth lens

[0084] S18, S28, S39: Side view of the fourth lens image

[0085] S18, S28, S39: Side surface of the fifth lens

[0086] S19, S29, S310: Side view of the fifth lens image

[0087] S110, S210, S311: Side surface of the sixth lens

[0088] S111, S211, S312: Side view of the sixth lens image

[0089] S112, S212, S313: Side of the filter material

[0090] S113, S213, S314: Filter image side view

[0091] S114, S214, S315: Protect the sides of glass objects

[0092] S115, S215, S316: Protective glass for the side image

[0093] S16, S26, S37: Aperture plane

Claims

1. An imaging lens, comprising: A 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; a second lens has refractive power; a third lens has refractive power; a fourth lens has negative refractive power, the fourth lens includes a concave surface facing the object side; a fifth lens has positive refractive power, the fifth lens includes a convex surface facing the image side; and a sixth lens has positive refractive power, the sixth lens includes a convex surface facing the object side; wherein the first lens, the second lens, the third lens, and the fourth lens have negative refractive power. The fourth lens, the fifth lens, and the sixth lens are arranged sequentially along an 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; 0.7f5 / f1.1; 10mmf2316mm; 0.16BFL / f0.23; 8.32mmT4+T5+T612.16mm; 0.08(R11-R12) / TTL0.31; 2.07R 42 / T42.93; 8.54 degrees / mm FOV / f 8.68 degrees / mm; where f is the effective focal length of one of the imaging lenses, f5 is the effective focal length of one of the fifth lenses, f23 is the effective focal length of the combination of the second and fifth lenses, T4 is the distance on the optical axis from the object side to the image side of one of the fourth lenses, T5 is the distance on the optical axis from the object side to the image side of one of the fifth lenses, and T6 is the distance on the optical axis from the object side to the image side of one of the sixth lenses. R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, R42 is the radius of curvature of the image side of the fourth lens, TTL is the distance from the object side of the first lens to an imaging plane on the optical axis, BFL is the distance from the image side of the sixth lens to the imaging plane on the optical axis, θ is the angle of view of the imaging lens at an image height of 3.304mm, and FOV is the field of view of the imaging lens.

2. The imaging lens as described in claim 1, wherein the second lens has negative refractive power and the third lens has positive refractive power.

3. The imaging lens as described in claim 2, wherein: The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; the third lens includes a convex surface facing the object side; the fourth lens is a biconcave lens and further includes a concave surface facing the object side; the fifth lens is a biconvex lens and further includes a convex surface facing the image side; the sixth lens is a biconvex lens and further includes a convex surface facing the image side; 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.

4. The imaging lens as described in claim 3, wherein: The third lens is a meniscus lens and further includes a concave surface facing the image side; and the second lens is cemented to the third lens, or there is no air gap between the second lens and the third lens.

5. The imaging lens as described in claim 3, wherein the third lens is a biconvex lens and further includes a convex surface facing the image side.

6. An imaging lens as described in any one of claims 1 to 5 of the patent application, wherein 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; 1.3f6 / f1.8; 1.5mmT4 / Nd4 1.9mm; 3.6mmBFL / Nd6 4.1mm; 304.47TTL / d56 318.48; wherein, f6 is the effective focal length of the sixth lens, f is the effective focal length of the imaging lens, T4 is the distance on the optical axis from the object side of the fourth lens to the image side of the fourth lens, 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, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, BFL is the distance on the optical axis from the image side of the sixth lens to the imaging plane, and d56 is the air gap on the optical axis from the image side of the fifth lens to the object side of the sixth lens.

7. An imaging lens, comprising: A 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; a second lens has positive refractive power; a third lens has negative refractive power; a fourth lens has negative refractive power, the fourth lens includes a concave surface facing the object side; a fifth lens has positive refractive power, the fifth lens includes a convex surface facing the image side; and a sixth lens has positive refractive power, the sixth lens includes a convex surface facing the object side; wherein the first lens, the second lens, the third lens, and the... The fourth, fifth, and sixth lenses are arranged sequentially along an 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; 0.7f5 / f1.1; 10mmf2316mm; 0.16BFL / f0.23; 8.32mmT4+T5+T612.16mm; 0.08(R11-R12) / TTL0.31; 2.07 R42 / T42.93; 8.54 degrees / mm FOV / f 8.68 degrees / mm; where f is the effective focal length of one of the imaging lenses, f5 is the effective focal length of one of the fifth lenses, f23 is the effective focal length of the combination of the second and fifth lenses, T4 is the distance on the optical axis from the object side to the image side of one of the fourth lenses, T5 is the distance on the optical axis from the object side to the image side of one of the fifth lenses, and T6 is the distance on the optical axis from the object side to the image side of one of the sixth lenses. R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, R42 is the radius of curvature of the image side of the fourth lens, TTL is the distance from the object side of the first lens to an imaging plane on the optical axis, BFL is the distance from the image side of the sixth lens to the imaging plane on the optical axis, θ is the angle of view of the imaging lens at an image height of 3.304mm, and FOV is the field of view of the imaging lens.

8. The imaging lens as described in claim 7, wherein: 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 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.

9. An imaging lens as described in any one of claims 7 to 8 of the patent application, wherein the imaging lens satisfies at least one of the following conditions: 1.5(Vd1+Vd2) / |Vd1-Vd2| 5.5; 1.5mmT4 / Nd4 1.9mm; 3.6mmBFL / Nd6 4.1mm; 304.47TTL / d56 318.48; 2(Vd2+Vd3) / |Vd2-Vd3| 2.7; 1.5(Vd4+Vd5) / |Vd4-Vd5| 2.5; 1.3f6 / f1.8; wherein, f is the effective focal length of the imaging lens, f6 is the effective focal length of the sixth lens, T4 is the distance on the optical axis from the object side of the fourth lens to the image side of the fourth lens, d56 is the air gap on the optical axis from the image side of the fifth lens to the object side of the sixth lens, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, BFL is the distance on the optical axis from the image side of the sixth lens to 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, Nd4 is the refractive index of the fourth lens, and Nd6 is the refractive index of the sixth lens.

Images