Lens assembly

Abstract

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

Description

Technical Field

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

[0002] The current trend in imaging lens development is not only towards a wider field of view, but also the need for high resolution to meet the diverse application requirements. Conventional imaging lenses can no longer meet current needs, and a new imaging lens architecture is required to simultaneously satisfy the requirements of a wide field of view and high resolution. Summary of the Invention

[0003] In view of this, the main objective of the present invention is to provide an imaging lens with a large field of view and high resolution, while still having good optical performance.

[0004] This invention provides an imaging lens comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh 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 is a meniscus lens with negative refractive power, and includes a convex surface facing the object side and a concave surface facing the image side. The third lens has refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has negative refractive power. The seventh lens is a biconvex lens with positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged sequentially along an optical axis from the object side to the image side. The imaging lens satisfies the following condition: 3 (T3+T4) / f 10; where f is the effective focal length of one of the imaging lenses, T3 is the distance on the optical axis from the object side of one of the third lenses to the image side of one of the third lenses, and T4 is the distance on the optical axis from the object side of one of the fourth lenses to the image side of one of the fourth lenses.

[0005] The sixth lens includes a concave surface facing the image side.

[0006] The third lens has positive refractive power and includes a convex surface facing the image side; the fourth lens includes a convex surface facing the image side; and the fifth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side.

[0007] The sixth lens is a biconcave lens, and may further include another concave surface facing the object.

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

[0009] The fourth lens is a biconvex lens, and may further include another convex surface facing the object.

[0010] The fourth lens is a meniscus lens and may further include a concave surface facing the object.

[0011] The third lens is a meniscus lens and may further include a concave surface facing the object; and the fourth lens is a biconvex lens and may further include another convex surface facing the object.

[0012] The fifth lens and the sixth lens are cemented together, and there is no air gap between the fifth lens and the sixth lens.

[0013] It may further include an aperture disposed between the fourth lens and the fifth lens, and the imaging lens satisfies at least one of the following conditions: -2 (f1+f2) / f3 -1;1.4 (f3 + f4) / Max(f3, f4) 1.9; 0.7 T3 / f3+T4 / f4 1.5; 1.7 (R51-R52) / R62 2.1; 0.4 (f5+f6) / f7 0.6;30 (R62×R71) / T67 40;8 (TTL-SL) / f 15; where f1 is one of the effective focal lengths of the first lens, f2 is one of the effective focal lengths of the second lens, f3 is one of the effective focal lengths of the third lens, f4 is one of the effective focal lengths of the fourth lens, f5 is one of the effective focal lengths of the fifth lens, f6 is one of the effective focal lengths of the sixth lens, f7 is one of the effective focal lengths of the seventh lens, Max(f3,f4) is the larger of the effective focal lengths of the third lens and the fourth 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, and T4 is the distance on the object-side surface of the fourth lens. The distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis, R51 is the radius of curvature of the object side of the fifth lens, R52 is the radius of curvature of the image side of the fifth lens, R62 is the radius of curvature of the image side of the sixth lens, R71 is the radius of curvature of the object side of the seventh lens, T67 is the air gap from the image side of the sixth lens to the object side of the seventh lens on the optical axis, TTL is the distance from the object side of the first lens to an imaging plane on the optical axis, SL is the distance from the aperture to the imaging plane on the optical axis, and f is the effective focal length of the imaging lens.

[0014] 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

[0015] Figure 1 is a schematic diagram of the lens configuration and optical path of an imaging lens according to a first embodiment of the present invention. Figures 2 and 3 are respectively the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the imaging lens according to the first embodiment of the present invention. Figure 4 is a schematic diagram of the lens configuration and optical path of the imaging lens according to the second embodiment of the present invention. Figures 5 and 6 are respectively a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the imaging lens according to the second embodiment of the present invention. Figure 7 is a schematic diagram of the lens configuration and optical path of the imaging lens according to the third embodiment of the present invention. Figures 8 and 9 are respectively the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the imaging lens according to the third embodiment of the present invention. Figure 10 is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the imaging lens according to the present invention. Figures 11 and 12 are respectively a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the imaging lens according to the fourth embodiment of the present invention. Implementation

[0016] This invention provides an imaging lens, comprising: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; an aperture; a fifth lens, which is a biconvex lens having positive refractive power and includes a convex surface facing an object side and another convex surface facing an image side; a sixth lens having refractive power and including a concave surface facing the image side; and a seventh lens having positive refractive power and including a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the aperture, the fifth lens, the sixth lens, and the seventh 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: 30mm (R62×R71) / T67 40mm; 8 (TTL-SL) / f 15;3 (T3+T4) / f 10; where f is the effective focal length of one of the imaging lenses, R62 is the radius of curvature of the image side of one of the sixth lenses, R71 is the radius of curvature of the object side of one of the seventh lenses, T67 is the air gap between the image side of the sixth lens and the object side of the seventh lens on the optical axis, TTL is the distance between the object side of the first lens and an imaging plane on the optical axis, SL is the distance between the aperture and the imaging plane on the optical axis, T3 is the distance between the object side of the third lens and the image side of one of the third lenses on the optical axis, and T4 is the distance between the object side of the fourth lens and the image side of one of the fourth lenses on the optical axis. When the imaging lens of the present invention satisfies the above features and at least one of the conditions, and no other additional features and conditions are required, the basic operation of the imaging lens of the present invention can be achieved.

[0017] Please refer to Tables 1, 2, 4, 5, 7, 8, 10 and 11 below. Tables 1, 4, 7 and 10 are the relevant parameter tables for each lens of the first to fourth embodiments of the imaging lens according to the present invention. Tables 2, 5, 8 and 11 are the relevant parameter tables for the aspherical surface of the aspherical lens in Tables 1, 4, 7 and 10.

[0018] Figures 1, 4, 7, and 10 are schematic diagrams of lens configuration and optical path according to the first, second, third, and fourth embodiments of the imaging lens of the present invention. Among them, the first lenses L11, L21, L31, and L41 are meniscus lenses with negative refractive power, made of glass, with the object-side surfaces S11, S21, S31, and S41 being convex surfaces and the image-side surfaces S12, S22, S32, and S42 being concave surfaces. The object-side surfaces S11, S21, S31, and S41 and the image-side surfaces S12, S22, S32, and S42 are all spherical surfaces.

[0019] The second lenses L12, L22, L32, and S42 are meniscus lenses with negative refractive power, made of glass. Their object-side surfaces S13, S23, S33, and S43 are convex, while their image-side surfaces S14, S24, S34, and S44 are concave. Both the object-side surfaces S13, S23, S33, and S43 and the image-side surfaces S14, S24, S34, and S44 are aspherical surfaces.

[0020] The third lenses L13, L23, L33, and L43 have positive refractive power and are made of glass. Their image sides S16, S26, S36, and S46 are convex.

[0021] The fourth lenses L14, L24, L34, and L44 have positive refractive power and are made of glass. Their image sides S18, S28, S38, and S48 are convex.

[0022] The fifth lenses L15, L25, L35, and L45 are biconvex lenses with positive refractive power, made of glass. Their object-side surfaces S110, S210, S310, and S410 are convex, and their image-side surfaces S111, S211, S311, and S411 are convex. Both the object-side surfaces S110, S210, S310, and S410 and the image-side surfaces S111, S211, S311, and S411 are spherical surfaces.

[0023] The sixth lenses L16, L26, L36, and S46 are biconcave lenses with negative refractive power, made of glass. Their object-side surfaces S111, S211, S311, and S411 are concave, and their image-side surfaces S112, S212, S312, and S412 are concave. Both the object-side surfaces S111, S211, S311, and S411 and the image-side surfaces S112, S212, S312, and S412 are spherical surfaces.

[0024] The fifth lenses L15, L25, L35, and L45 are cemented together with the sixth lenses L16, L26, L36, and L46, and there is no air gap between the fifth lenses L15, L25, L35, and L45 and the sixth lenses L16, L26, L36, and L46.

[0025] The seventh lenses L17, L27, L37, and L47 are biconvex lenses with positive refractive power, made of glass. Their object-side surfaces S113, S213, S313, and S413 are convex, and their image-side surfaces S114, S214, S314, and S414 are convex. Both the object-side surfaces S113, S213, S313, and S413 and the image-side surfaces S114, S214, S314, and S414 are aspherical surfaces.

[0026] In addition, imaging lenses 1, 2, 3, and 4 satisfy at least one of the following conditions (1) to (8):

[0027] -2 (f1+f2) / f3 -1; (1)

[0028] 1.4 (f3+f4) / Max(f3,f4) 1.9; (2)

[0029] 0.7 T3 / f3+T4 / f4 1.5; (3)

[0030] 1.7 (R51-R52) / R62 2.1; (4)

[0031] 30mm (R62×R71) / T67 40mm; (5)

[0032] 0.4 (f5+f6) / f7 0.6; (6)

[0033] 8 (TTL-SL) / f 15; (7)

[0034] 3 (T3+T4) / f 10; (8)

[0035] Wherein, f is the effective focal length of one of the imaging lenses 1, 2, 3, and 4 in the first to fourth embodiments; f1 is the effective focal length of one of the first lenses L11, L21, L31, and L41 in the first to fourth embodiments; f2 is the effective focal length of one of the second lenses L12, L22, L32, and L42 in the first to fourth embodiments; f3 is the effective focal length of one of the third lenses L13, L23, L33, and L43 in the first to fourth embodiments; f4 is the effective focal length of one of the fourth lenses L14, L24, L34, and L44 in the first to fourth embodiments; f5 is the effective focal length of one of the fifth lenses L15, L25, L35, and L45 in the first to fourth embodiments; f6 is the first In embodiments one through four, the effective focal length of one of the sixth lenses L16, L26, L36, and L46 is given; f7 is the effective focal length of one of the seventh lenses L17, L27, L37, and L47 in embodiments one through four; Max(f3, f4) is the larger focal length value among the effective focal length f3 of the third lenses L13, L23, L33, and L43 and the effective focal length f4 of the fourth lenses L14, L24, L34, and L44 in embodiments one through four; and T3 is the sum of the object-side surfaces S15, S25, S35, and S45 of the third lenses L13, L23, L33, and L43 and the image-side surfaces S16, S26 of the third lenses L13, L23, L33, and L43 in embodiments one through four. S36 and S46 are a distance between the optical axes OA1, OA2, OA3, and OA4; T4 is a distance between the object-side surfaces S17, S27, S37, and S47 of the fourth lenses L14, L24, L34, and L44 and the image-side surfaces S18, S28, S38, and S48 of the fourth lenses L14, L24, L34, and L44 on the optical axes OA1, OA2, OA3, and OA4 in the first to fourth embodiments; R51 is a radius of curvature between the object-side surfaces S110, S210, S310, and S410 of the fifth lenses L15, L25, L35, and L45 in the first to fourth embodiments. R52 is the radius of curvature of one of the image-side surfaces S111, S211, S311, and S411 of the fifth lenses L15, L25, L35, and L45 in the first to fourth embodiments; R62 is the radius of curvature of one of the image-side surfaces S112, S212, S312, and S412 of the sixth lenses L16, L26, L36, and L46 in the first to fourth embodiments; R71 is the radius of curvature of one of the object-side surfaces S113, S213, S313, and S413 of the seventh lenses L17, L27, L37, and L47 in the first to fourth embodiments; T67 is the radius of curvature of one of the image-side surfaces S113, S213, S313, and S413 of the seventh lenses L17, L27, L37, and L47 in the first to fourth embodiments; and T67 is the radius of curvature of one of the image-side surfaces S111, S211, S313, and S413 of the seventh lenses L17, L27, L37, and L47 in the first to fourth embodiments.The air gap between the image sides S112, S212, S312, S412 of the sixth lenses L16, L26, L36, L46 and the object sides S113, S213, S313, S413 of the seventh lenses L17, L27, L37, L47 on the optical axes OA1, OA2, OA3, OA4 is one of the air gaps on the optical axes OA1, OA2, OA3, OA4. TTL is the distance between the object sides S11, S21, S31, S41 of the first lenses L11, L21, L31, L41 and the imaging planes IMA1, IMA2, IMA3, IMA4 on the optical axes OA1, OA2, OA3, OA4 in the first to fourth embodiments. SL is the distance between the apertures ST1, ST2, ST3, ST4 and the imaging planes IMA1, IMA2, IMA3, IMA4 on the optical axes OA1, OA2, OA3, OA4 in the first to fourth embodiments. This allows imaging lenses 1, 2, 3, and 4 to effectively improve the field of view and effectively correct aberrations.

[0036] When condition (1):-2 is met (f1+f2) / f3 -1 can effectively provide sufficient refractive power to enhance the field of view and effectively correct aberrations. When conditions (2) and (3) are met: 1.4 (f3+f4) / Max(f3,f4) 1.9; 0.7 T3 / f3+T4 / f4 1.5 can effectively improve light collection ability, effectively improve resolution, and effectively correct aberrations. When conditions (4) and (5) are met: 1.7 (R51-R52) / R62 2.1; 30mm (R62×R71) / T67 40mm can effectively correct color differences and improve resolution. When condition (6): 0.4 is met. (f5+f6) / f7 0.6 can effectively improve resolution and correct aberrations. When condition (7):8 is met. (TTL-SL) / f 15. This can effectively reduce the overall length of the lens and help improve resolution. When condition (8):3 is met. (T3+T4) / f 10. It can effectively collect enough light and help correct aberrations and improve resolution.

[0037] 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, a fourth lens L14, an aperture ST1, a fifth lens L15, a sixth lens L16, a seventh lens L17, and a filter OF1. During imaging, the light rays from the object side are finally imaged onto an imaging plane IMA1. According to paragraphs 1 to 9 of the [Implementation Method], the third lens L13 is a biconvex lens, its object-side surface S15 is convex, and both the object-side surface S15 and the image-side surface S16 are spherical surfaces; the fourth lens L14 is a biconvex lens, its object-side surface S17 is convex, and both the object-side surface S17 and the image-side surface S18 are spherical surfaces; the filter OF1 has both its object-side surface S115 and the image-side surface S116 as planes; by utilizing the above-mentioned lens, aperture ST1 and the design that satisfies at least one of conditions (1) to (8), the imaging lens 1 can effectively improve the field of view and effectively correct aberrations.

[0038] Table 1 shows the relevant parameters of each lens in imaging lens 1 in Figure 1.

[0039] The aspherical surface concavity z of the aspherical lens in Table 1 is obtained by the following formula: z = ch2 / {1 + [1 - (k + 1)c2h2]1 / 2} + Ah4 + Bh6 + Ch8. Where: c: curvature; h: perpendicular distance from any point on the lens surface to the first axis; k: conic coefficient; A~C: aspherical coefficient.

[0040] Table 2 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 1, where k is the conic constant and A~C are the aspherical coefficients.

[0041] Table 3 shows the relevant parameter values ​​of the imaging lens 1 of the first embodiment and the calculated values ​​of the corresponding conditions (1) to (8). As can be seen from Table 3, the imaging lens 1 of the first embodiment can meet the requirements of conditions (1) to (8).

[0042] The imaging lens 1 of the first embodiment described above satisfies conditions (1) to (8) and the refractive power and surface shape in Table 1, and is a preferred embodiment of the present invention.

[0043] The imaging lens 1 of the first embodiment described above can also be modified to satisfy any one of the conditions (1) to (8) and the following: the first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens is a biconvex lens with positive refractive power and includes one convex surface facing the object side and another convex surface facing the image side, the sixth lens includes a concave surface facing the image side, and the seventh lens has positive refractive power and includes a convex surface facing the object side. The basic operation of the imaging lens of the present invention can be achieved without other additional conditions and features.

[0044] 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 0.02 mm. As shown in Figure 3, the field curvature of the imaging lens 1 in the first embodiment is between -0.09 mm and 0.03 mm, and its distortion is between 0% and 30%. Clearly, the longitudinal aberration, field curvature, and distortion of the imaging lens 1 in the first embodiment can be effectively corrected, thereby achieving better optical performance.

[0045] The second embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 4, 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, a fourth lens L24, an aperture ST2, a fifth lens L25, a sixth lens L26, a seventh lens L27, and a filter OF2. During imaging, the light rays from the object side are finally imaged onto an imaging plane IMA2. According to paragraphs one to nine of the [Implementation Method], the third lens L23 is a biconvex lens, its object-side surface S25 is convex, and both the object-side surface S25 and the image-side surface S26 are aspherical surfaces; the fourth lens L24 is a meniscus lens, its object-side surface S27 is concave, and both the object-side surface S27 and the image-side surface S28 are spherical surfaces; the filter OF2 has both its object-side surface S215 and the image-side surface S216 as planes; by utilizing the above-mentioned lens, aperture ST2 and the design that satisfies at least one of conditions (1) to (8), the imaging lens 2 can effectively improve the field of view and effectively correct aberrations.

[0046] Table 4 shows the relevant parameters of each lens in imaging lens 2 in Figure 4.

[0047] The definition of the aspherical surface concavity z of each lens in Table 4 is the same as the definition of the aspherical surface concavity z of each lens in Table 1 of the first embodiment, and will not be repeated here.

[0048] Table 5 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 4, where k is the conic constant and A~C are the aspherical coefficients.

[0049] Table 6 shows the relevant parameter values ​​of the imaging lens 2 in the second embodiment and the calculated values ​​of the corresponding conditions (1) to (8). As can be seen from Table 6, the imaging lens 2 in the second embodiment can meet the requirements of conditions (1) to (8).

[0050] The imaging lens 2 of the second embodiment described above satisfies conditions (1) to (8) and the refractive power and surface shape in Table 4, and is a preferred embodiment of the present invention.

[0051] The imaging lens 2 of the second embodiment described above can also be modified to satisfy only any one of the conditions (1) to (8) and the following: the first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens is a biconvex lens with positive refractive power and includes one convex surface facing the object side and another convex surface facing the image side, the sixth lens includes a concave surface facing the image side, and the seventh lens has positive refractive power and includes a convex surface facing the object side. No other additional conditions or features are required to achieve the basic operation of the imaging lens of the present invention.

[0052] Furthermore, the optical performance of the imaging lens 2 in the second embodiment also meets the requirements. As shown in Figure 5, the longitudinal aberration of the imaging lens 2 in the second embodiment is between -0.01mm and 0.005mm. As shown in Figure 6, the field curvature of the imaging lens 2 in the second embodiment is between -0.10mm and 0.03mm, and its distortion is between 0% and 33%. Clearly, the longitudinal aberration, field curvature, and distortion of the imaging lens 2 in the second embodiment can be effectively corrected, thereby achieving better optical performance.

[0053] The third embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 7, 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, a fourth lens L34, an aperture ST3, a fifth lens L35, a sixth lens L36, a seventh lens L37, and a filter OF3. During imaging, the light rays from the object side are finally imaged onto an imaging plane IMA3. According to paragraphs one to nine of the [Implementation Method], the third lens L33 is a biconvex lens, its object-side surface S35 is convex, and both the object-side surface S35 and the image-side surface S36 are spherical surfaces; the fourth lens L34 is a biconvex lens, its object-side surface S37 is convex, and both the object-side surface S37 and the image-side surface S38 are aspherical surfaces; the filter OF3 has both its object-side surface S315 and the image-side surface S316 as planar surfaces; by utilizing the above-mentioned lens, aperture ST3 and the design that satisfies at least one of conditions (1) to (8), the imaging lens 3 can effectively improve the field of view and effectively correct aberrations.

[0054] Table 7 shows the relevant parameters of each lens in imaging lens 3 in Figure 7.

[0055] The definition of the aspherical surface concavity z of each lens in Table 7 is the same as the definition of the aspherical surface concavity z of each lens in Table 1 of the first embodiment, and will not be repeated here.

[0056] Table 8 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 7, where k is the conic constant and A~C are the aspherical coefficients.

[0057] Table 9 shows the relevant parameter values ​​of the imaging lens 3 of the third embodiment and the calculated values ​​of the corresponding conditions (1) to (8). As can be seen from Table 9, the imaging lens 3 of the third embodiment can meet the requirements of conditions (1) to (8).

[0058] The imaging lens 3 of the third embodiment described above satisfies conditions (1) to (8) and the refractive power and surface shape in Table 7, and is a preferred embodiment of the present invention.

[0059] The imaging lens 3 of the third embodiment described above can also be modified to satisfy any one of the conditions (1) to (8) and the following: the first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens is a biconvex lens with positive refractive power and includes one convex surface facing the object side and another convex surface facing the image side, the sixth lens includes a concave surface facing the image side, and the seventh lens has positive refractive power and includes a convex surface facing the object side. The basic operation of the imaging lens of the present invention can be achieved without other additional conditions and features.

[0060] Furthermore, the optical performance of the imaging lens 3 in the third embodiment also meets the requirements. As shown in Figure 8, the longitudinal aberration of the imaging lens 3 in the third embodiment is between -0.01mm and 0.005mm. As shown in Figure 9, the field curvature of the imaging lens 3 in the third embodiment is between -0.08mm and 0.04mm, and its distortion is between 0% and 25%. Clearly, the longitudinal aberration, field curvature, and distortion of the imaging lens 3 in the third embodiment can be effectively corrected, thereby achieving better optical performance.

[0061] The fourth embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 10, the imaging lens 4, along an optical axis OA4, sequentially includes a first lens L41, a second lens L42, a third lens L43, a fourth lens L44, an aperture ST4, a fifth lens L45, a sixth lens L46, a seventh lens L47, and a filter OF4 from the object side to the image side. During imaging, the light rays from the object side are finally imaged onto an imaging plane IMA4. According to paragraphs one to nine of the [Implementation Method], the third lens L43 is a meniscus lens, with its object-side surface S45 being concave and both the object-side surface S45 and the image-side surface S46 being aspherical surfaces; the fourth lens L44 is a biconvex lens, with its object-side surface S47 being convex and both the object-side surface S47 and the image-side surface S48 being spherical surfaces; the filter OF4 has its object-side surface S415 and the image-side surface S416 being planar; by utilizing the above-mentioned lens, aperture ST4 and the design that satisfies at least one of conditions (1) to (8), the imaging lens 4 can effectively improve the field of view and effectively correct aberrations.

[0062] Table 10 shows the relevant parameters of each lens in imaging lens 4 in Figure 10.

[0063] The definition of the aspherical surface concavity z of each lens in Table 10 is the same as the definition of the aspherical surface concavity z of each lens in Table 1 of the first embodiment, and will not be repeated here.

[0064] Table 11 shows the relevant parameters of the aspherical surface of the aspherical lens in Table 10, where k is the conic constant and A~C are the aspherical coefficients.

[0065] Table 12 shows the relevant parameter values ​​of the imaging lens 4 in the fourth embodiment and the calculated values ​​of the corresponding conditions (1) to (8). As can be seen from Table 12, the imaging lens 4 in the fourth embodiment can meet the requirements of conditions (1) to (8).

[0066] The imaging lens 4 of the fourth embodiment described above satisfies conditions (1) to (8) and the refractive power and surface shape in Table 10, and is a preferred embodiment of the present invention.

[0067] The imaging lens 4 of the fourth embodiment described above can also be modified to satisfy any one of the conditions (1) to (8) and the following: the first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens is a biconvex lens with positive refractive power and includes one convex surface facing the object side and another convex surface facing the image side, the sixth lens includes a concave surface facing the image side, and the seventh lens has positive refractive power and includes a convex surface facing the object side. No other additional conditions or features are required to achieve the basic operation of the imaging lens of the present invention.

[0068] Furthermore, the optical performance of the imaging lens 4 in the fourth embodiment also meets the requirements. As shown in Figure 11, the longitudinal aberration of the imaging lens 4 in the fourth embodiment is between -0.01 mm and 0.005 mm. As shown in Figure 12, the field curvature of the imaging lens 4 in the fourth embodiment is between -0.22 mm and 0.04 mm, and its distortion is between 0% and 21%. 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.

[0069] 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.

[0070] 1, 2, 3, 4: Imaging lenses L11, L21, L31, L41: First lens L12, L22, L32, L42: Second lenses L13, L23, L33, L43: Third lens L14, L24, L34, L44: Fourth lens L15, L25, L35, L45: Fifth lens L16, L26, L36, L46: Sixth lens L17, L27, L37, L47: Seventh Lens ST1, ST2, ST3, ST4: Aperture OF1, OF2, OF3, OF4: Filters IMA1, IMA2, IMA3, IMA4: Imaging planes OA1, OA2, OA3, OA4: Optical Axis S11, S21, S31, S41: Side surface of the first lens S12, S22, S32, S42: Side view of the first lens image S13, S23, S33, S43: Side surface of the second lens S14, S24, S34, S44: Side view of the second lens image S15, S25, S35, S45: Side surface of the third lens S16, S26, S36, S46: Side view of the third lens image S17, S27, S37, S47: Side view of the fourth lens S18, S28, S38, S48: Side view of the fourth lens image S110, S210, S310, S410: Side surface of the fifth lens S111, S211, S311, S411: Side view of the fifth lens image S111, S211, S311, S411: Side surface of the sixth lens S112, S212, S312, S412: Side view of the sixth lens image S113, S213, S313, S413: Side surface of the seventh lens S114, S214, S314, S414: Side view of the seventh lens image S115, S215, S315, S415: Side of the filter material S116, S216, S316, S416: Filter image side view S19, S29, S39, S49: Aperture plane

Claims

1. An imaging lens, comprising: A first lens, which is a meniscus lens with negative refractive power, includes a convex surface facing an object side and a concave surface facing an image side; a second lens, which is a meniscus lens with negative refractive power, includes a convex surface facing the object side and a concave surface facing the image side; a third lens, which has refractive power; a fourth lens, which has positive refractive power; a fifth lens, which has positive refractive power; a sixth lens, which has negative refractive power; and a seventh lens, which is a biconvex lens with positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side; wherein the first, second, third, fourth, fifth, sixth, and seventh lenses are arranged sequentially along an optical axis from the object side to the image side; wherein only seven lenses have refractive power; wherein the imaging lens satisfies at least one of the following conditions: 0.4 ≤ (f5+f6) / f7 ≤ 0.6; 30 mm ≤ (R62×R71) / T67 ≤ 40 mm; where f5 is one of the effective focal lengths of the fifth lens, f6 is one of the effective focal lengths of the sixth lens, f7 is one of the effective focal lengths of the seventh lens, R62 is one of the radius of curvature of the image side of the sixth lens, R71 is one of the radius of curvature of the object side of the seventh lens, and T67 is one of the air gaps on the optical axis between the image side of the sixth lens and the object side of the seventh lens.

2. The imaging lens as claimed in claim 1, wherein the third lens is a biconvex lens and includes a convex surface facing the object side.

3. The imaging lens as claimed in claim 2, wherein the fourth lens is a biconvex lens and includes a convex surface facing the object side.

4. The imaging lens as described in claim 1, wherein: The third lens is a meniscus lens and includes a concave surface facing the object; and the fourth lens is a biconvex lens and includes a convex surface facing the object.

5. An imaging lens, comprising: A first lens, which is a meniscus lens with negative refractive power, includes a convex surface facing an object side and a concave surface facing an image side; a second lens, which is a meniscus lens with negative refractive power, includes a convex surface facing the object side and a concave surface facing the image side; a third lens, which has refractive power, includes a convex surface facing the object side; a fourth lens, which is a meniscus lens, includes a concave surface facing the object side; a fifth lens, which has positive refractive power; a sixth lens, which has negative refractive power; and a seventh lens, which is a biconvex lens with positive refractive power, includes a convex surface facing the object side and another convex surface facing the image side; wherein the first, second, third, fourth, fifth, sixth, and seventh lenses are arranged sequentially along an optical axis from the object side to the image side; wherein only seven lenses have refractive power. The imaging lens satisfies at least one of the following conditions: -2 ≤ (f1+f2) / f3 ≤ -1; 1.4 ≤ (f3+f4) / Max(f3,f4) ≤ 1.9; 1.7 ≤ (R51-R52) / R62 ≤ 2.1; 0.4 ≤ (f5+f6) / f7 ≤ 0.6; 30 mm ≤ (R62×R71) / T67 ≤ 40 mm; Wherein, f1 is one of the effective focal lengths of the first lens, f2 is one of the effective focal lengths of the second lens, f3 is one of the effective focal lengths of the third lens, f4 is one of the effective focal lengths of the fourth lens, f5 is one of the effective focal lengths of the fifth lens, f6 is one of the effective focal lengths of the sixth lens, f7 is one of the effective focal lengths of the seventh lens, Max(f3,f4) is the larger effective focal length value between the effective focal lengths of the third lens and the effective focal lengths of the fourth lens, R51 is one of the object-side curvature radii of the fifth lens, R52 is one of the image-side curvature radii of the fifth lens, R62 is one of the image-side curvature radii of the sixth lens, R71 is one of the object-side curvature radii of the seventh lens, and T67 is the air gap between the image-side of the sixth lens and the object-side of the seventh lens on the optical axis.

6. The imaging lens as described in claim 1 or 5, wherein the sixth lens includes a concave surface facing the image side.

7. The imaging lens as described in claim 6, wherein: The third lens has positive refractive power and includes a convex surface facing the image side; the fourth lens includes a convex surface facing the image side; The fifth lens is a biconvex lens, and includes one convex surface facing the object side and another convex surface facing the image side.

8. The imaging lens as claimed in claim 7, wherein the sixth lens is a biconcave lens and further includes another concave surface facing the object side.

9. The imaging lens as claimed in claim 1 or 5, wherein the fifth lens and the sixth lens are cemented together, and there is no air gap between the fifth lens and the sixth lens.

10. An imaging lens as described in claim 1 or 5, further comprising an aperture disposed between the fourth lens and the fifth lens, the imaging lens satisfying at least one of the following conditions: -2 ≤ (f1+f2) / f3 ≤ -1; 1.4 ≤ (f3+f4) / Max(f3,f4) ≤ 1.9; 0.7 ≤ T3 / f3+T4 / f4 ≤ 1.5; 1.7 ≤ (R51-R52) / R62 ≤ 2.1; 8 ≤ (TTL-SL) / f ≤ 15; 3 ≤ (T3+T4) / f ≤ 10; wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, Max(f3,f4) is the larger of the effective focal lengths of the third lens and the fourth lens, T3 is the distance on the optical axis from the object side to the image side of the third lens, T4 is the distance on the optical axis from the object side to the image side of the fourth lens, R51 is the radius of curvature of the object side of the fifth lens, R52 is the radius of curvature of the image side of the fifth lens, R62 is the radius of curvature of the image side of the sixth lens, TTL is the distance on the optical axis from the object side of the first lens to an imaging plane, SL is the distance on the optical axis from the aperture to the imaging plane, and f is the effective focal length of the imaging lens.

Images