WO2024111309A1 - 撮像レンズおよび撮像装置 - Google Patents

撮像レンズおよび撮像装置 Download PDF

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Publication number
WO2024111309A1
WO2024111309A1 PCT/JP2023/038062 JP2023038062W WO2024111309A1 WO 2024111309 A1 WO2024111309 A1 WO 2024111309A1 JP 2023038062 W JP2023038062 W JP 2023038062W WO 2024111309 A1 WO2024111309 A1 WO 2024111309A1
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Prior art keywords
lens
imaging lens
conditional expression
group
imaging
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PCT/JP2023/038062
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English (en)
French (fr)
Japanese (ja)
Inventor
有 北原
正直 川名
雅人 近藤
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Fujifilm Corp
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Fujifilm Corp
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Priority to CN202380080412.8A priority Critical patent/CN120225935A/zh
Priority to JP2024560016A priority patent/JPWO2024111309A1/ja
Publication of WO2024111309A1 publication Critical patent/WO2024111309A1/ja
Priority to US19/204,088 priority patent/US20250264697A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the technology disclosed herein relates to imaging lenses and imaging devices.
  • imaging lenses that can be used in imaging devices such as digital cameras are known from JP 2022-033487 A and JP 2016-038418 A.
  • the present disclosure aims to provide an imaging lens that is small and has good optical performance, and an imaging device that includes this imaging lens.
  • a first aspect of the present disclosure is an imaging lens comprising, in order from the object side to the image side, a front group, an aperture, and a rear group, the front group including, in succession from the most object side to the image side, a first lens which is a negative lens with a concave surface facing the image side, and a second lens which is a negative lens with a concave surface facing the image side, two or less focusing lens groups are disposed on the image side of the second lens, and during focusing, the two or less focusing lens groups move along the optical axis, and lenses other than the two or less focusing lens groups are fixed with respect to the image plane, where Bf is the back focus at an air-equivalent distance of the entire system when focused on an object at infinity, f is the focal length of the entire system when focused on an object at infinity, and ⁇ m is the maximum half angle of view when focused on an object at infinity, 0.3 ⁇ Bf/(f ⁇ tan ⁇ m) ⁇ 1.5 (1)
  • the conditional expression (1) expressed
  • the imaging lens of the first aspect when the distance on the optical axis from the lens surface closest to the object side of the imaging lens to the aperture when focused on an object at infinity is defined as STI, and when the distance on the optical axis from the lens surface closest to the object side of the imaging lens to the lens surface closest to the image side of the imaging lens when focused on an object at infinity is defined as TL, and the sum of the distance on the optical axis from the lens surface closest to the object side of the imaging lens to the lens surface closest to the image side of the imaging lens when focused on an object at infinity and the back focus in terms of the air equivalent distance of the entire system, 0.3 ⁇ STI/TL ⁇ 0.75 (2)
  • the conditional expression (2) expressed by the following formula is satisfied.
  • a third aspect of the present disclosure is directed to an imaging lens according to the first aspect, in which, when the focal length of the front group when focused on an object at infinity is fF and the focal length of the rear group when focused on an object at infinity is fR, ⁇ 2 ⁇ fR/fF ⁇ 4 (3)
  • the conditional expression (3) expressed by the following expression is satisfied.
  • a fourth aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the paraxial radius of curvature of the object-side surface of the first lens is RL1f, ⁇ 0.3 ⁇ f/RL1f ⁇ 8 (4)
  • the conditional expression (4) expressed by the following formula is satisfied.
  • a fifth aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the paraxial radius of curvature of the image side surface of the first lens is RL1r, 0 ⁇ f/RL1r ⁇ 4 (5)
  • the conditional expression (5) expressed by the following formula is satisfied.
  • a sixth aspect of the present disclosure is directed to an imaging lens according to the first aspect, wherein, when the focal length of the front group in a state in which the lens is focused on an object at infinity is fF, ⁇ 1 ⁇ f/fF ⁇ 2 (6)
  • the conditional expression (6) expressed by the following formula is satisfied.
  • a seventh aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the maximum imaging magnification of the imaging lens is ⁇ , 0.06 ⁇
  • An eighth aspect of the present disclosure is directed to an imaging lens according to the first aspect, wherein, when the imaging lens is focused on an object at infinity, the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side and the back focus in terms of an air-equivalent distance of the entire system is defined as TL, 3 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 7 (8) The conditional expression (8) is satisfied.
  • a ninth aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.55 ⁇ FNo/tan ⁇ m ⁇ 2 (9) The conditional expression (9) is satisfied.
  • a tenth aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the Abbe number of the first lens based on the d-line is ⁇ L1, 20 ⁇ L1 ⁇ 95 (10) The conditional expression (10) expressed by the following expression is satisfied.
  • An eleventh aspect of the present disclosure is an imaging lens according to the first aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is defined as TL, 3.5 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 5.65 (8-3) The condition (8-3) is satisfied.
  • a twelfth aspect of the present disclosure is the imaging lens of the eleventh aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.7 ⁇ FNo/tan ⁇ m ⁇ 1.35 (9-3) The condition (9-3) is satisfied.
  • a thirteenth aspect of the present disclosure is the imaging lens of the twelfth aspect, wherein, when the Abbe number based on the d-line of the first lens is ⁇ L1, 28 ⁇ L1 ⁇ 59 (10-1) The condition (10-1) is satisfied.
  • a fourteenth aspect of the present disclosure is the imaging lens of the first aspect, wherein the imaging lens includes only one focusing lens group, the focusing lens group being disposed in a rear group, and assuming that the focal length of the focusing lens group is ff, 0.05 ⁇
  • a fifteenth aspect of the present disclosure is the imaging lens of the first aspect, wherein the imaging lens includes only one focusing lens group, the focusing lens group being disposed in a rear group, and when the focal length of the focusing lens group is ff and the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state focused on an object at infinity is TL, then: 0.1 ⁇
  • a seventeenth aspect of the present disclosure is the imaging lens of the fourteenth aspect, wherein, when a composite focal length of all lenses located on the object side of the focusing lens group is ff_f, ⁇ 3 ⁇ f/ff_f ⁇ 0 (14)
  • the conditional expression (14) expressed by the following expression is satisfied.
  • An eighteenth aspect of the present disclosure is the imaging lens of the fourteenth aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is defined as TL: 3.2 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 6.5 (8-1) The condition (8-1) is satisfied.
  • a nineteenth aspect of the present disclosure is the imaging lens of the eighteenth aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.7 ⁇ FNo/tan ⁇ m ⁇ 1.35 (9-3) The condition (9-3) is satisfied.
  • a twentieth aspect of the present disclosure is the imaging lens of the nineteenth aspect, wherein, when the Abbe number of the first lens based on the d-line is ⁇ L1, 28 ⁇ L1 ⁇ 59 (10-1) The condition (10-1) is satisfied.
  • a twenty-first aspect of the present disclosure is an imaging lens according to the first aspect, in which the imaging lens includes only one focusing lens group, and the focusing lens group is disposed in the front group.
  • a twenty-second aspect of the present disclosure is the imaging lens of the twenty-first aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is defined as TL: 3.4 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 5.9 (8-2) The condition (8-2) is satisfied.
  • a twenty-third aspect of the present disclosure is the imaging lens of the twenty-second aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.66 ⁇ FNo/tan ⁇ m ⁇ 1.55 (9-2) The condition (9-2) is satisfied.
  • a twenty-fourth aspect of the present disclosure is an imaging lens according to the first aspect, in which the focusing lens group includes an aperture, and the aperture moves along the optical axis during focusing.
  • a twenty-fifth aspect of the present disclosure is the imaging lens of the twenty-fourth aspect, wherein the imaging lens includes only one focusing lens group, and when a focal length of the focusing lens group is ffs, 0.1 ⁇ f/ffs ⁇ 0.5 (15)
  • the conditional expression (15) expressed by the following expression is satisfied.
  • a 26th aspect of the present disclosure is the imaging lens of the 24th aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is defined as TL: 3.4 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 5.9 (8-2) The condition (8-2) is satisfied.
  • a twenty-seventh aspect of the present disclosure is the imaging lens of the twenty-sixth aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.55 ⁇ FNo/tan ⁇ m ⁇ 2 (9) The conditional expression (9) is satisfied.
  • a 28th aspect of the present disclosure is the imaging lens of the 24th aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is defined as TL: 3 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 7 (8) The conditional expression (8) is satisfied.
  • a twenty-ninth aspect of the present disclosure is the imaging lens of the twenty-eighth aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.64 ⁇ FNo/tan ⁇ m ⁇ 1.62 (9-1) The condition (9-1) is satisfied.
  • a 30th aspect of the present disclosure is an imaging lens according to the first aspect, in which the imaging lens includes two focusing lens groups, and when the focusing lens group on the object side of the two focusing lens groups is designated as the first focusing lens group and the focusing lens group on the image side is designated as the second focusing lens group, during focusing, the first focusing lens group and the second focusing lens group move by different amounts.
  • a thirty-first aspect of the present disclosure provides the imaging lens of the thirty-first aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is denoted as TL, 3.4 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 5.9 (8-2) The condition (8-2) is satisfied.
  • a thirty-second aspect of the present disclosure is the imaging lens of the thirty-first aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.66 ⁇ FNo/tan ⁇ m ⁇ 1.55 (9-2) The condition (9-2) is satisfied.
  • the thirty-third aspect of the present disclosure is the imaging lens of the thirty-first aspect, in which a first focusing lens group is arranged in the front group and a second focusing lens group is arranged in the rear group.
  • a thirty-fourth aspect of the present disclosure is the imaging lens of the thirty-third aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is defined as TL: 3 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 7 (8) The conditional expression (8) is satisfied.
  • a thirty-fifth aspect of the present disclosure is the imaging lens of the thirty-fourth aspect, wherein, when the maximum aperture F-number in a state in which an object at infinity is focused is FNo, 0.66 ⁇ FNo/tan ⁇ m ⁇ 1.55 (9-2) The condition (9-2) is satisfied.
  • a thirty-sixth aspect of the present disclosure is the imaging lens of the thirty-fifth aspect, 0.43 ⁇ Bf/(f ⁇ tan ⁇ m) ⁇ 1.1 (1-1) The condition (1-1) is satisfied.
  • a thirty-seventh aspect of the present disclosure is the imaging lens of the thirty-sixth aspect, wherein, when the Abbe number based on the d-line of the first lens is ⁇ L1, 20 ⁇ L1 ⁇ 95 (10) The conditional expression (10) expressed by the following expression is satisfied.
  • a thirty-eighth aspect of the present disclosure is the imaging lens of the thirty-first aspect, wherein, when the focal length of the first focusing lens group is ff1 and the focal length of the second focusing lens group is ff2, 0.2 ⁇
  • the conditional expression (16) expressed by the following expression is satisfied.
  • a thirty-ninth aspect of the present disclosure is, in the imaging lens of the thirtieth aspect, when the lateral magnification of the first focusing lens group in a state focused on an object at infinity is ⁇ f1 and the lateral magnification of the second focusing lens group in a state focused on an object at infinity is ⁇ f2, 0 ⁇
  • the conditional expression (17) expressed by the following expression is satisfied.
  • a fortieth aspect of the present disclosure is the imaging lens of the thirtieth aspect, wherein, when the lateral magnification of the first focusing lens group in a state in which the image sensor is focused on an object at infinity is ⁇ f1, 0 ⁇ f1+(1/ ⁇ f1) ⁇ ⁇ 2 ⁇ 0.25 (18) The conditional expression (18) is satisfied.
  • a forty-first aspect of the present disclosure is the imaging lens of the thirty-first aspect, wherein, when the lateral magnification of the second focusing lens group in a state in which the lens is focused on an object at infinity is ⁇ f2, 0 ⁇ f2+(1/ ⁇ f2) ⁇ ⁇ 2 ⁇ 0.25 (19) The conditional expression (19) is satisfied.
  • a forty-second aspect of the present disclosure is the imaging lens of the thirtieth aspect, wherein, when a composite focal length of all lenses located on the image side of the second focusing lens group is f2r, 0.1 ⁇ f/f2r ⁇ 2 (20)
  • the conditional expression (20) expressed by the following expression is satisfied.
  • a forty-third aspect of the present disclosure is the imaging lens of the thirtieth aspect, wherein, when a composite focal length of all lenses located on the object side of the first focusing lens group is f1f, ⁇ 3 ⁇ f/f1f ⁇ 2 (21)
  • the conditional expression (21) expressed by the following expression is satisfied.
  • a forty-fourth aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the focal length of the first lens is fL1 and the focal length of the second lens is fL2, 0 ⁇ fL1/fL2 ⁇ 5.5 (22)
  • the conditional expression (22) expressed by the following expression is satisfied.
  • a forty-fifth aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the focal length of the first lens is fL1, ⁇ 8 ⁇ fL1/f ⁇ 0.5 (23)
  • the conditional expression (23) expressed by the following expression is satisfied.
  • a forty-sixth aspect of the present disclosure is the imaging lens of the first aspect, wherein, assuming that the paraxial radius of curvature of the object-side surface of the first lens is RL1f and the paraxial radius of curvature of the image-side surface of the first lens is RL1r, ⁇ 2.5 ⁇ (RL1r ⁇ RL1f)/(RL1r+RL1f) ⁇ 0.1 (24)
  • the conditional expression (24) expressed by the following expression is satisfied.
  • a forty-seventh aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the paraxial radius of curvature of the object-side surface of the second lens is RL2f and the paraxial radius of curvature of the image-side surface of the second lens is RL2r, ⁇ 1.5 ⁇ (RL2r ⁇ RL2f)/(RL2r+RL2f) ⁇ 0.05 (25)
  • the conditional expression (25) expressed by the following expression is satisfied.
  • a forty-eighth aspect of the present disclosure is directed to the imaging lens of the first aspect, in which a third lens which is a negative lens is disposed adjacent to the image side of the second lens, a fourth lens which is a positive lens is disposed adjacent to the image side of the third lens, and the focal length of the third lens is fL3 and the focal length of the fourth lens is fL4, ⁇ 8 ⁇ fL3/fL4 ⁇ 0 (26)
  • the conditional expression (26) expressed by the following expression is satisfied.
  • a forty-ninth aspect of the present disclosure is, in the imaging lens of the first aspect, when the paraxial radius of curvature of the object side surface of the lens closest to the image side of the imaging lens is RLef and the paraxial radius of curvature of the image side surface of the lens closest to the image side of the imaging lens is RLer, 0.4 ⁇ (RLer-RLef)/(RLer+RLef) ⁇ 5.5 (27)
  • the conditional expression (27) expressed by the following expression is satisfied.
  • a fiftieth aspect of the present disclosure is the imaging lens of the first aspect, wherein at least one of the object side surface and the image side surface of the first lens is aspheric, and when the paraxial radius of curvature of the object side surface of the first lens is RL1f, the paraxial radius of curvature of the image side surface of the first lens is RL1r, the radius of curvature at the position of the maximum effective diameter of the object side surface of the first lens is RyL1f, and the radius of curvature at the position of the maximum effective diameter of the image side surface of the first lens is RyL1r, 0.5 ⁇ (1/RL1f-1/RL1r)/(1/RyL1f-1/RyL1r) ⁇ 7 (28)
  • the conditional expression (28) expressed by the following expression is satisfied.
  • a fifty-first aspect of the present disclosure is the imaging lens of the fifty-first aspect, wherein, when the Abbe number based on the d-line of the first lens is ⁇ L1, 32 ⁇ L1 ⁇ 48 (10-2) The condition (10-2) is satisfied.
  • a fifty-second aspect of the present disclosure is the imaging lens of the first aspect, wherein the front group includes at least one positive lens, and when the focal length of the positive lens having the strongest refractive power among the positive lenses included in the front group is fFp, 0.1 ⁇ f/fFp ⁇ 3 (29) The condition (29) is satisfied.
  • a fifty-third aspect of the present disclosure is the imaging lens of the first aspect, wherein the rear group includes at least one positive lens, and when the focal length of the positive lens with the strongest refractive power among the positive lenses included in the rear group is fRp and the focal length of the rear group in a state where the lens is focused on an object at infinity is fR, 0.3 ⁇ fR/fRp ⁇ 5 (30)
  • the conditional expression (30) expressed by the following expression is satisfied.
  • a fifty-fourth aspect of the present disclosure is the imaging lens of the first aspect, wherein the rear group includes a cemented lens in which a positive lens with a convex surface facing the object side and a negative lens are cemented together in this order from the object side, and when the Abbe number based on the d-line of the positive lens in the cemented lens is vRp and the Abbe number based on the d-line of the negative lens in the cemented lens is vRn, 10 ⁇ Rp- ⁇ Rn ⁇ 75 (31)
  • the conditional expression (31) expressed by the following expression is satisfied.
  • a fifty-fifth aspect of the present disclosure is the imaging lens of the fifty-fourth aspect, wherein, assuming that the refractive index of the positive lens in the cemented lens for the d-line is NRp and the refractive index of the negative lens in the cemented lens for the d-line is NRn, 0.2 ⁇ NRp-NRn ⁇ 0.9 (32)
  • the conditional expression (32) expressed by the following expression is satisfied.
  • the 56th aspect of the present disclosure is the imaging lens of the first aspect, in which a positive LFe lens is disposed closest to the image side of the front group.
  • a fifty-seventh aspect of the present disclosure is the fifty-sixth aspect of the imaging lens, in which the LFe lens is a biconvex lens.
  • a fifty-eighth aspect of the present disclosure is the imaging lens of the fifty-sixth aspect, wherein at least one of the object-side surface and the image-side surface of the LFe lens is aspheric, and when the paraxial radius of curvature of the object-side surface of the LFe lens is RcLFef, the paraxial radius of curvature of the image-side surface of the LFe lens is RcLFer, the radius of curvature of the object-side surface of the LFe lens at the position of the maximum effective diameter is RyLFef, and the radius of curvature of the image-side surface of the LFe lens at the position of the maximum effective diameter is RyLFer, 0.5 ⁇ (1/RcLFef-1/RcLFer)/(1/RyLFef-1/Ry LFer) ⁇ 7 (33)
  • the conditional expression (33) expressed by the following expression is satisfied.
  • a fifty-ninth aspect of the present disclosure is the imaging lens of the fifty-sixth aspect, wherein, assuming that the paraxial radius of curvature of the object-side surface of the LFe lens is RcLFef and the paraxial radius of curvature of the image-side surface of the LFe lens is RcLFer, ⁇ 4 ⁇ (RcLFef ⁇ RcLFer)/(RcLFef+RcLFer) ⁇ 10 (34) The conditional expression (34) expressed by the following expression is satisfied.
  • a sixtieth aspect of the present disclosure relates to the imaging lens of the fifty-sixth aspect, wherein, when the Abbe number based on the d-line of the LFe lens is ⁇ LFe, 15 ⁇ LFe ⁇ 90 (35)
  • the conditional expression (35) expressed by the following expression is satisfied.
  • a sixty-first aspect of the present disclosure is directed to the imaging lens of the first aspect, wherein, when a center thickness of the first lens is D1 and a sum of a distance on the optical axis from a lens surface of the imaging lens closest to the object side to a lens surface of the imaging lens closest to the image side in a state in which an object at infinity is focused on, and a back focus in an air-equivalent distance of the entire system is TL, 0.007 ⁇ D1/TL ⁇ 0.1 (36)
  • the conditional expression (36) expressed by the following expression is satisfied.
  • a 62nd aspect of the present disclosure is the imaging lens of the 1st aspect, wherein, assuming that the thickness of the first lens in the optical axis direction at the height of the maximum effective diameter of the image-side surface of the first lens is DH1 and the center thickness of the first lens is D1, 2 ⁇ DH1/D1 ⁇ 10 (37) The condition (37) is satisfied.
  • a sixty-third aspect of the present disclosure is the imaging lens of the first aspect, wherein, when the Abbe number based on the d-line of the lens closest to the image side of the imaging lens is ⁇ Le, 30 ⁇ Le ⁇ 95 (38)
  • the conditional expression (38) expressed by the following expression is satisfied.
  • a sixty-fourth aspect of the present disclosure is the imaging lens of the first aspect, wherein, when an effective radius of the object-side surface of the first lens is EL1, 0.7 ⁇ EL1/(f ⁇ tan ⁇ m) ⁇ 2 (39)
  • the conditional expression (39) expressed by the following expression is satisfied.
  • a sixty-fifth aspect of the present disclosure is directed to the imaging lens of the first aspect, further comprising an Ls lens on the image side of the second lens, wherein, assuming that the refractive index of the Ls lens with respect to the d-line is NLs, the Abbe number of the Ls lens with respect to the d-line is ⁇ Ls, and the partial dispersion ratio between the g-line and the F-line of the Ls lens is ⁇ gFLs, 0.005 ⁇ NLs-(2.015-0.0068 ⁇ Ls) ⁇ 0.15 (40) 49.8 ⁇ Ls ⁇ 65 (41) 0.543 ⁇ gFLs ⁇ 0.58 (42) ⁇ 0.011 ⁇ gFLs ⁇ (0.6418 ⁇ 0.00168 ⁇ Ls) ⁇ 0.035 (43)
  • the conditions (40), (41), (42), and (43) expressed by the following formulae are satisfied.
  • a 66th aspect of the present disclosure is the imaging lens of the 65th aspect, wherein, when the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the lens surface of the imaging lens closest to the image side in a state in which the imaging lens is focused on an object at infinity and the back focus in an air-equivalent distance of the entire system is defined as TL: 3.5 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 5.65 (8-3) The condition (8-3) is satisfied.
  • a 67th aspect of the present disclosure is the imaging lens of the 66th aspect, wherein, when the maximum aperture F-number in a state where an object at infinity is focused is FNo, 0.55 ⁇ FNo/tan ⁇ m ⁇ 2 (9) The conditional expression (9) is satisfied.
  • the 68th aspect of the present disclosure is an imaging device equipped with an imaging lens of any one of the 1st to 67th aspects.
  • the invention may also include lenses that have substantially no refractive power, optical elements other than lenses such as apertures, filters, and cover glasses, as well as mechanical parts such as lens flanges, lens barrels, image sensors, and image stabilization mechanisms.
  • a group having positive refractive power means that the group as a whole has positive refractive power.
  • a group having negative refractive power means that the group as a whole has negative refractive power.
  • the "focusing lens group,” “first focusing lens group,” “second focusing lens group,” and “single focusing lens group” are not limited to configurations consisting of multiple lenses, and may be configurations consisting of only one lens.
  • Composite aspherical lenses (lenses in which a spherical lens and an aspherical film formed on the spherical lens are integrally constructed and function as a single aspherical lens as a whole) are not considered cemented lenses, but are treated as a single lens.
  • the radius of curvature, sign of refractive power, and surface shape of lenses containing aspheric surfaces are those in the paraxial region.
  • the sign of the radius of curvature of a surface with a convex shape facing the object side is positive, and the sign of the radius of curvature of a surface with a convex shape facing the image side is negative.
  • total system refers to the imaging lens.
  • focal length used in the conditional expressions is the paraxial focal length.
  • distance on the optical axis used in the conditional expressions is the geometric distance unless otherwise specified.
  • values used in the conditional expressions are values based on the d-line when focused on an object at infinity, unless otherwise specified.
  • the "d-line,” “C-line,” “F-line,” and “g-line” mentioned in this specification are emission lines, and the wavelength of the d-line is treated as 587.56 nm (nanometers), the wavelength of the C-line as 656.27 nm (nanometers), the wavelength of the F-line as 486.13 nm (nanometers), and the wavelength of the g-line as 435.84 nm (nanometers).
  • ⁇ gF (Ng-NF)/(NF-NC)
  • the present disclosure makes it possible to provide an imaging lens that is small and has good optical performance, and an imaging device that includes this imaging lens.
  • FIG. 1 is a cross-sectional view showing a configuration of an imaging lens according to an embodiment, which corresponds to the imaging lens of Example 1.
  • FIG. 2 is a cross-sectional view showing the configuration of the imaging lens and a light beam in FIG. 1.
  • FIG. 2 is a diagram for explaining the position of the effective radius and the maximum effective diameter.
  • 3A to 3C are diagrams showing various aberrations of the imaging lens of Example 1.
  • FIG. 11 is a cross-sectional view showing a configuration of an imaging lens according to a second embodiment. 6A to 6C are diagrams showing various aberrations of the imaging lens of Example 2.
  • FIG. 11 is a cross-sectional view showing a configuration of an imaging lens according to a third embodiment.
  • 11A to 11C are diagrams showing various aberrations of the imaging lens of Example 3.
  • FIG. 11 is a cross-sectional view showing a configuration of an imaging lens according to a fourth embodiment.
  • 11A to 11C are diagrams showing various aberrations of the imaging lens according to Example 4.
  • FIG. 13 is a cross-sectional view showing a configuration of an imaging lens according to a fifth embodiment.
  • 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 5.
  • FIG. 13 is a cross-sectional view showing a configuration of an imaging lens according to a sixth embodiment.
  • 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 6.
  • FIG. 13 is a cross-sectional view showing a configuration of an imaging lens according to a seventh embodiment.
  • 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 7.
  • FIG. 13 is a cross-sectional view showing a configuration of an imaging lens according to an eighth embodiment.
  • 13A to 13C are diagrams showing various aberrations of the imaging lens according to Example 8.
  • FIG. 13 is a cross-sectional view showing a configuration of an imaging lens according to a ninth embodiment.
  • 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 9.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a tenth embodiment.
  • 21A to 21C are diagrams showing aberrations of the imaging lens of Example 10.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to an eleventh embodiment.
  • 13A to 13C are diagrams showing aberrations of the imaging lens of Example 11.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a twelfth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 12.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a thirteenth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 13.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a fourteenth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 14.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a fifteenth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 15.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a sixteenth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 16.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a seventeenth embodiment.
  • 23A to 23C are diagrams showing various aberrations of the imaging lens of Example 17.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to an eighteenth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 18.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a nineteenth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 19.
  • FIG. 19 is a cross-sectional view showing the configuration of an imaging lens according to a sixteenth embodiment.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a twentieth embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 20.
  • FIG. 23 is a cross-sectional view showing the configuration of an imaging lens according to a twenty-first embodiment.
  • 23A to 23C are diagrams showing aberrations of the imaging lens of Example 21.
  • 1 is a perspective view of the front side of an imaging device according to an embodiment.
  • FIG. 2 is a perspective view of the rear side of the imaging device according to the embodiment.
  • FIG. 1 shows a cross-sectional view of the configuration of an imaging lens according to an embodiment of the present disclosure.
  • FIG. 2 shows a cross-sectional view of the configuration of the imaging lens of FIG. 1 and the light beam.
  • the light beam is an on-axis light beam and a light beam with a maximum half angle of view ⁇ m.
  • the left side is the object side and the right side is the image side, and the state in which an object at infinity is focused is shown.
  • an object at an infinite distance is referred to as an infinite object.
  • the example shown in FIGS. 1 and 2 corresponds to the imaging lens of Example 1 described below. The following explanation will be made mainly with reference to FIG. 1.
  • the imaging lens of the present disclosure is composed of, in order from the object side to the image side along the optical axis Z, a front group GF, an aperture stop St, and a rear group GR.
  • the front group GF includes, in succession from the most object side to the image side, a first lens which is a negative lens with a concave surface facing the image side, and a second lens which is a negative lens with a concave surface facing the image side.
  • the front group GF having the above configuration plays the role of a wide converter, and by dividing the negative refractive power on the object side between the first lens and the second lens, it is advantageous for correcting various aberrations such as distortion aberration and field curvature. Furthermore, by arranging the first lens and second lens as described above, it is advantageous for suppressing various aberrations while ensuring the angle of view.
  • each group of the imaging lens in Figure 1 is configured as follows.
  • the front group GF consists of seven lenses, lenses L11 to L17, from the object side to the image side.
  • the rear group GR consists of six lenses, lenses L21 to L26, from the object side to the image side.
  • lens L11 corresponds to the first lens
  • lens L12 corresponds to the second lens.
  • the aperture stop St in Figure 1 does not indicate the size or shape, but rather the position in the optical axis direction. This method of illustrating the aperture stop St is similar in other cross-sectional views.
  • two or less focusing lens groups are arranged closer to the image side than the second lens.
  • the two or less focusing lens groups move along the optical axis Z, and lenses other than the two or less focusing lens groups are fixed relative to the image plane Sim.
  • focusing by moving the lens groups closer to the image side than the second lens, fluctuations in the angle of view during focusing can be suppressed.
  • the imaging lens in FIG. 1 has two focusing lens groups.
  • the amount of movement of each focusing lens group can be reduced, which is advantageous for high-speed focusing.
  • the focusing lens group on the object side of the two focusing lens groups will be referred to as the first focusing lens group Gf1
  • the focusing lens group on the image side will be referred to as the second focusing lens group Gf2.
  • the first focusing lens group Gf1 and the second focusing lens group Gf2 move by different amounts. By moving the two focusing lens groups by different amounts, it is possible to effectively suppress aberration fluctuations that accompany changes in shooting distance.
  • the first focusing lens group Gf1 consists of lens L15
  • the second focusing lens group Gf2 consists of lens L16 and lens L17.
  • the arrows indicate the direction in which each focusing lens group moves when focusing from an object at infinity to the nearest object.
  • the first focusing lens group Gf1 moves toward the image side
  • the second focusing lens group Gf2 moves toward the object side.
  • a positive lens may be arranged closest to the image side of the front group GF. This is advantageous for correcting spherical aberration.
  • the positive lens arranged closest to the image side of the front group GF will be referred to as the LFe lens below. It is preferable that the e lens is a biconvex lens. In this case, it is advantageous for correcting spherical aberration.
  • the lens L17 corresponds to the LFe lens.
  • the rear group GR may be configured to include a cemented lens in which a positive lens with a convex surface facing the object side and a negative lens are cemented together in that order from the object side. This is advantageous for correcting chromatic aberration.
  • the lens in the rear group GR closest to the image side may be a positive lens.
  • the angle of incidence of the off-axis chief ray on the image plane Sim can be prevented from becoming large, which is advantageous for ensuring the amount of peripheral light.
  • imaging lens of the present disclosure With respect to the conditional expressions will be described.
  • conditional expressions to avoid redundancy, the same symbols will be used for elements with the same definitions, and duplicate explanations of the symbols will be omitted.
  • imaging lens of the present disclosure will also be referred to simply as the "imaging lens.”
  • the imaging lens satisfies the following conditional expression (1).
  • the back focus in the air equivalent distance of the entire system in a state where the lens is focused on an object at infinity is Bf.
  • the focal length of the entire system in a state where the lens is focused on an object at infinity is f.
  • the maximum half angle of view in a state where the lens is focused on an object at infinity is ⁇ m.
  • the back focus Bf in the air equivalent distance is the air equivalent distance on the optical axis from the lens surface closest to the image side of the imaging lens to the image surface Sim.
  • the back focus Bf is shown in FIG. 2.
  • tan is the tangent.
  • the imaging lens satisfies the following condition (1-1). 0.43 ⁇ Bf/(f ⁇ tan ⁇ m) ⁇ 1.1 (1-1)
  • the imaging lens satisfies the following conditional expression (2).
  • the distance on the optical axis from the lens surface of the imaging lens closest to the object to the aperture stop St when the imaging lens is focused on an object at infinity is defined as STI.
  • the sum of the distance on the optical axis from the lens surface of the imaging lens closest to the object to the lens surface of the imaging lens closest to the image when the imaging lens is focused on an object at infinity and the back focus Bf in the air equivalent distance of the entire system is defined as TL.
  • TL is the total length of the lens system.
  • FIG. 2 shows the above-mentioned distance STI and the total length TL of the lens system.
  • conditional expression (2) By making the corresponding value of conditional expression (2) not equal to or less than the lower limit, it is possible to secure a sufficient space on the object side of the aperture stop St, so that an appropriate number of lenses can be arranged and the absolute value of the radius of curvature of the lens can be configured without forcibly decreasing it. This makes it easy to preferably correct various aberrations.
  • the position of the aperture stop St can be prevented from getting too close to the image plane Sim, thereby preventing the angle of incidence of the off-axis chief ray incident on the image sensor located on the image plane Sim in the imaging device from becoming excessively large.
  • the imaging lens satisfies the following conditional expression (3).
  • the focal length of the front group GF in a state where the lens is focused on an object at infinity is fF.
  • the focal length of the rear group GR in a state where the lens is focused on an object at infinity is fR.
  • Conditional expression (3) is an expression for appropriately setting the ratio between the refractive power of the front group GF and the refractive power of the rear group GR.
  • the front group GF plays the role of a wide converter that increases the angle of view while ensuring a sufficient back focus in the entire optical system.
  • conditional expression (3) By making sure that the corresponding value of conditional expression (3) is not equal to or less than the lower limit, various aberrations such as spherical aberration can be suppressed. By making sure that the corresponding value of conditional expression (3) is not equal to or more than the upper limit, it is advantageous to achieve a wide angle of view. ⁇ 2 ⁇ fR/fF ⁇ 4 (3)
  • the imaging lens satisfies the following conditional expression (4).
  • conditional expression (4) By ensuring that the corresponding value of conditional expression (4) is not equal to or less than the lower limit, it is advantageous for correction of distortion.
  • corresponding value of conditional expression (4) By ensuring that the corresponding value of conditional expression (4) is not equal to or more than the upper limit, it is advantageous for correction of astigmatism. ⁇ 0.3 ⁇ f/RL1f ⁇ 8 (4)
  • conditional expression (4) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (4) from -0.3 to any of -0.2, -0.1, and 0. It is also preferable to change the upper limit of conditional expression (4) from 8 to any of 4, 1, and 0.4.
  • the imaging lens satisfies the following conditional expression (5).
  • conditional expression (5) By making the corresponding value of conditional expression (5) not equal to or smaller than the lower limit, it is advantageous for correction of distortion.
  • corresponding value of conditional expression (5) By making the corresponding value of conditional expression (5) not equal to or larger than the upper limit, it is advantageous for correction of astigmatism. 0 ⁇ f/RL1r ⁇ 4 (5)
  • the imaging lens satisfies the following conditional expression (6).
  • conditional expression (6) By making sure that the corresponding value of conditional expression (6) is not below the lower limit, the negative refractive power of the front group GF does not become too strong, which is advantageous for shortening the overall length of the optical system.
  • conditional expression (6) By making sure that the corresponding value of conditional expression (6) is not above the upper limit, the positive refractive power of the front group GF does not become too strong, which is advantageous for correcting distortion and field curvature. ⁇ 1 ⁇ f/fF ⁇ 2 (6)
  • the imaging lens When the maximum magnification of the imaging lens is ⁇ , it is preferable that the imaging lens satisfies the following conditional expression (7).
  • the imaging magnification in a state where the closest object is focused is defined as the maximum magnification.
  • the corresponding value of conditional expression (7) By making the corresponding value of conditional expression (7) not equal to or less than the lower limit, it is possible to prevent the range of shooting distances where shooting is possible from becoming narrow, and therefore it is possible to ensure a suitable added value as an imaging lens.
  • the corresponding value of conditional expression (7) By making the corresponding value of conditional expression (7) not equal to or more than the upper limit, it is possible to suppress the amount of movement of the focusing lens group when focusing, which contributes to the miniaturization of the optical system. 0.06 ⁇
  • conditional expression (7) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (7) from 0.06 to 0.07 or 0.08. It is also preferable to change the upper limit of conditional expression (7) from 0.5 to 0.35 or 0.21.
  • the imaging lens satisfies the following conditional expression (8).
  • conditional expression (8) By making sure that the corresponding value of conditional expression (8) is not equal to or less than the lower limit, it is advantageous for maintaining high optical performance.
  • the corresponding value of conditional expression (8) is not equal to or more than the upper limit, it is advantageous for making the optical system compact. 3 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 7 (8)
  • conditional expression (8) it is preferable to replace the lower limit of 3 in conditional expression (8) with any of 3.2, 3.4, 3.5, 3.7, and 3.9. Also, it is preferable to replace the upper limit of 7 in conditional expression (8) with any of 6.5, 5.9, 5.65, 5.3, and 4.9.
  • the imaging lens it is more preferable for the imaging lens to satisfy the following conditional expression (8-1), it is even more preferable for the imaging lens to satisfy the following conditional expression (8-2), and it is even more preferable for the imaging lens to satisfy the following conditional expression (8-3).
  • 3.2 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 6.5 (8-1) 3.4 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 5.9 (8-2) 3.5 ⁇ TL/(f ⁇ tan ⁇ m) ⁇ 5.65 (8-3)
  • conditional expression (9) When the maximum F-number in a state where an object at infinity is focused is designated as FNo, it is preferable that the imaging lens satisfies the following conditional expression (9).
  • conditional expression (9) By making the corresponding value of conditional expression (9) not equal to or less than the lower limit, it becomes easy to suppress an increase in the number of lenses and to suppress an increase in the size of the optical system while obtaining good optical performance.
  • conditional expression (9) By making the corresponding value of conditional expression (9) not equal to or more than the upper limit, it becomes possible to widen the angle of view or to reduce the maximum F-number, making it possible to accommodate a wide range of applications and to provide an imaging lens with high value. 0.55 ⁇ FNo/tan ⁇ m ⁇ 2 (9)
  • conditional expression (9) of 0.55 it is preferable to replace the lower limit of conditional expression (9) of 0.55 with any of 0.58, 0.6, 0.62, 0.64, 0.66, 0.68, and 0.7. It is also preferable to replace the upper limit of conditional expression (9) of 2 with any of 1.9, 1.8, 1.7, 1.62, 1.55, 1.45, and 1.35.
  • the imaging lens it is more preferable for the imaging lens to satisfy the following conditional expression (9-1), it is even more preferable for the imaging lens to satisfy the following conditional expression (9-2), and it is even more preferable for the imaging lens to satisfy the following conditional expression (9-3).
  • the imaging lens satisfies the following conditional expression (10).
  • conditional expression (10) By making the corresponding value of conditional expression (10) not equal to or less than the lower limit, the Abbe number of the first lens, which is a negative lens, does not become too small, which is advantageous for good correction of lateral chromatic aberration. In general, the refractive index of optical materials tends to decrease as the Abbe number increases.
  • conditional expression (10) By making the corresponding value of conditional expression (10) not equal to or more than the upper limit, the Abbe number of the first lens, which is a negative lens, does not become too large, which is advantageous for good correction of distortion aberration and field curvature. 20 ⁇ L1 ⁇ 95 (10)
  • conditional expression (10) In order to obtain better characteristics, it is preferable to replace the lower limit of 20 in conditional expression (10) with any of 21, 22, 23, 24, 26, 28, 30, 31, and 32. It is also preferable to replace the upper limit of 95 in conditional expression (10) with any of 83, 75, 69, 64, 62, 59, 56, 52, and 48.
  • conditional expression (10-1) it is more preferable for the imaging lens to satisfy the following conditional expression (10-1)
  • conditional expression (10-2) 28 ⁇ L1 ⁇ 59 (10-1) 32 ⁇ L1 ⁇ 48 (10-2)
  • the imaging lens satisfies the following conditional expression (16).
  • the focal length of the first focusing lens group Gf1 is ff1.
  • the focal length of the second focusing lens group Gf2 is ff2.
  • conditional expression (16) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (16) from 0.2 to 0.6 or 1. It is also preferable to change the upper limit of conditional expression (16) from 5 to 3.5 or 2.5.
  • the imaging lens satisfies the following conditional expression (17).
  • the lateral magnification of the first focusing lens group Gf1 when focused on an object at infinity is ⁇ f1.
  • the lateral magnification of the second focusing lens group Gf2 when focused on an object at infinity is ⁇ f2.
  • conditional expression (17) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (17) from 0 to 0.02 or 0.04. It is also preferable to change the upper limit of conditional expression (17) from 0.6 to 0.5 or 0.4.
  • the imaging lens In a configuration in which the imaging lens includes two focusing lens groups, it is preferable that the imaging lens satisfies the following conditional expression (18).
  • conditional expression (18) By making the corresponding value of conditional expression (18) not equal to or less than the lower limit, it becomes easy to correct spherical aberration and axial chromatic aberration.
  • conditional expression (18) By making the corresponding value of conditional expression (18) not equal to or greater than the upper limit, it becomes easy to correct astigmatism, and it is advantageous for size reduction because the amount of movement of the first focusing lens group Gf1 from a state focused on an object at infinity to a state focused on the nearest object can be suppressed. 0 ⁇ f1+(1/ ⁇ f1) ⁇ ⁇ 2 ⁇ 0.25 (18)
  • the imaging lens In a configuration in which the imaging lens includes two focusing lens groups, it is preferable that the imaging lens satisfies the following conditional expression (19).
  • conditional expression (19) By making sure that the corresponding value of conditional expression (19) is not equal to or lower than the lower limit, correction of field curvature and astigmatism becomes easy.
  • conditional expression (19) By making sure that the corresponding value of conditional expression (19) is not equal to or higher than the upper limit, correction of astigmatism becomes easy, and the amount of movement of the second focusing lens group Gf2 from a state focused on an object at infinity to a state focused on the nearest object can be suppressed, which is advantageous for miniaturization. 0 ⁇ f2+(1/ ⁇ f2) ⁇ ⁇ 2 ⁇ 0.25 (19)
  • the imaging lens when the composite focal length of all the lenses on the image side of the second focusing lens group Gf2 is f2r, it is preferable that the imaging lens satisfies the following conditional expression (20).
  • conditional expression (20) By making the corresponding value of conditional expression (20) not equal to or less than the lower limit, the composite refractive power of all the lenses on the image side of the second focusing lens group Gf2 does not become too weak, which is advantageous for correcting chromatic aberration of magnification.
  • conditional expression (20) By making the corresponding value of conditional expression (20) not equal to or more than the upper limit, the composite refractive power of all the lenses on the image side of the second focusing lens group Gf2 does not become too strong, which is advantageous for correcting distortion aberration and curvature of field.
  • the lower limit of condition (20) from 0.1 to any of 0.15, 0.2, and 0.25. It is also preferable to change the upper limit of condition (20) from 2 to any of 1.5, 1, and 0.8.
  • the imaging lens when the composite focal length of all the lenses on the object side of the first focusing lens group Gf1 is f1f, it is preferable that the imaging lens satisfies the following conditional expression (21).
  • conditional expression (21) By making the corresponding value of conditional expression (21) not equal to or less than the lower limit, the negative composite refractive power of all the lenses on the object side of the first focusing lens group Gf1 does not become too strong, which is advantageous for shortening the overall length of the optical system and also makes it easier to ensure the amount of peripheral light.
  • conditional expression (21) By making the corresponding value of conditional expression (21) not equal to or more than the upper limit, the positive composite refractive power of all the lenses on the object side of the first focusing lens group Gf1 does not become too strong, which is advantageous for correcting distortion and field curvature. ⁇ 3 ⁇ f/f1f ⁇ 2 (21)
  • the imaging lens satisfies the following conditional expression (22).
  • the front group GF plays the role of a wide converter, and by dividing the negative refractive power on the object side between the first lens and the second lens, it is advantageous to correct various aberrations such as distortion and curvature of field.
  • the lower limit of conditional expression (22) is 0 ⁇ fL1/fL2 because both the first lens and the second lens are negative lenses.
  • conditional expression (22) By making the corresponding value of conditional expression (22) not equal to or greater than the upper limit, the negative refractive power of the first lens does not become too weak, making it easy to satisfactorily correct chromatic aberration of magnification by the first lens. 0 ⁇ fL1/fL2 ⁇ 5.5 (22)
  • the lower limit of conditional expression (22) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (22) from 0 to 0.1. In this case, the negative refractive power of the second lens does not become too weak, which is advantageous for correcting distortion and field curvature. In order to obtain even better characteristics, it is preferable to change the lower limit of conditional expression (22) from 0 to 0.2 or 0.3. In addition, in order to obtain even better characteristics, it is preferable to change the upper limit of conditional expression (22) from 5.5 to any of 4, 2.5, and 1.5.
  • the imaging lens satisfies the following conditional expression (23).
  • the first lens is a lens that shares the role of a wide converter.
  • Conditional expression (23) specifies a preferable range for performing good aberration correction while increasing the angle of view of this first lens.
  • the negative refractive power of the first lens relative to the refractive power of the entire system is not too weak, so that the negative refractive power can be suitably shared between the first lens and the second lens in the front group GF that plays the role of a wide converter. This is advantageous for correcting various aberrations such as distortion aberration and curvature of field.
  • conditional expression (23) By making the corresponding value of conditional expression (23) not equal to or more than the upper limit, the refractive power of the first lens relative to the refractive power of the entire system is not too strong, so that it is easy to satisfactorily correct chromatic aberration of magnification by the first lens. ⁇ 8 ⁇ fL1/f ⁇ 0.5 (23)
  • the imaging lens satisfies the following conditional expression (24).
  • the paraxial radius of curvature of the object side surface of the first lens is RL1f.
  • the paraxial radius of curvature of the image side surface of the first lens is RL1r.
  • Conditional expression (24) specifies the shape factor of the first lens. By making the corresponding value of conditional expression (24) not equal to or less than the lower limit, it becomes easy to correct astigmatism well. By making the corresponding value of conditional expression (24) not equal to or more than the upper limit, it becomes easy to correct spherical aberration well.
  • conditional expression (24) it becomes easy to achieve a wide angle because the refractive power of the lens does not become too weak. ⁇ 2.5 ⁇ (RL1r ⁇ RL1f)/(RL1r+RL1f) ⁇ 0.1 (24)
  • conditional expression (24) it is preferable to change the lower limit of conditional expression (24) from -2.5 to -2 or -1.5. It is also preferable to change the upper limit of conditional expression (24) from -0.1 to -0.2 or -0.3.
  • the imaging lens satisfies the following conditional expression (25).
  • the paraxial radius of curvature of the object side surface of the second lens is RL2f.
  • the paraxial radius of curvature of the image side surface of the second lens is RL2r.
  • Conditional expression (25) specifies the shape factor of the second lens.
  • conditional expression (25) it becomes easy to achieve a wide angle because the refractive power of the lens does not become too weak. ⁇ 1.5 ⁇ (RL2r ⁇ RL2f)/(RL2r+RL2f) ⁇ 0.05 (2 5)
  • a third lens which is a negative lens
  • a fourth lens which is a positive lens
  • the imaging lens when the focal length of the third lens is fL3 and the focal length of the fourth lens is fL4, it is preferable that the imaging lens satisfies the following conditional expression (26).
  • conditional expression (26) By making the corresponding value of conditional expression (26) not equal to or less than the lower limit, the negative refractive power of the third lens does not become too weak, making it easy to correct various aberrations such as distortion aberration and field curvature.
  • the upper limit of conditional expression (26) is fL3/fL4 ⁇ 0, based on the signs of the refractive powers of the third lens and the fourth lens. ⁇ 8 ⁇ fL3/fL4 ⁇ 0 (26)
  • conditional expression (26) In order to obtain even better characteristics, it is preferable to change the lower limit of conditional expression (26) from -8 to -5.5 or -3.5. Also, it is preferable to change the upper limit of conditional expression (26) from 0 to -0.03. In this case, the positive refractive power of the fourth lens does not become too weak, making it easier to correct spherical aberration. In order to obtain even better characteristics, it is preferable to change the upper limit of conditional expression (26) from 0 to -0.1 or -0.15.
  • the imaging lens satisfies the following conditional expression (27).
  • the paraxial radius of curvature of the object side surface of the lens closest to the image side of the imaging lens is designated as RLef.
  • the paraxial radius of curvature of the image side surface of the lens closest to the image side of the imaging lens is designated as RLer.
  • the lower limit of condition (27) In order to obtain better characteristics, it is preferable to change the lower limit of condition (27) from 0.4 to 0.5 or 0.6. It is also preferable to change the upper limit of condition (27) from 5.5 to 4.2 or 3.3.
  • At least one of the object side surface and the image side surface of the first lens may be aspheric.
  • the imaging lens satisfies the following conditional expression (28).
  • the paraxial radius of curvature of the object side surface of the first lens is RL1f.
  • the paraxial radius of curvature of the image side surface of the first lens is RL1r.
  • the radius of curvature at the position of the maximum effective diameter of the object side surface of the first lens is RyL1f.
  • the radius of curvature at the position of the maximum effective diameter of the image side surface of the first lens is RyL1r.
  • conditional expression (28) By making the corresponding value of conditional expression (28) not equal to or less than the lower limit, the refractive power of the lens on the peripheral side is not too strong, so that overcorrection of the field curvature can be suppressed. By making the corresponding value of conditional expression (28) not equal to or more than the upper limit, the refractive power of the lens on the peripheral side is not too weak, which is advantageous for correcting the field curvature.
  • the lower limit of condition (28) is 0.5 to any of 0.7, 0.9, and 1.1.
  • the lower limit of condition (28) is changed from 0.5 to any of 0.7, 0.9, and 1.1.
  • the lower limit of condition (28) is changed from 0.5 to any of 0.7, 0.9, and 1.1.
  • the lower limit of condition (28) is changed from 0.5 to any of 0.7, 0.9, and 1.1.
  • the lower limit of condition (28) is preferable to change the lower limit of condition (28) from 0.5 to any of 0.7, 0.9, and 1.1.
  • 5.7, 4.5, or 3.5 is 5.7, 4.5, or 3.5.
  • FIG. 3 shows an example of the position Px of the maximum effective diameter.
  • the left side is the object side
  • the right side is the image side.
  • FIG. 3 shows the on-axis light beam Xa and the off-axis light beam Xb passing through the lens Lx.
  • the upper light beam Xb1 of the off-axis light beam Xb is the light beam that passes through the outermost side.
  • the distance from the intersection of the outermost light beam and the lens surface among the light beams that enter the lens surface from the object side and exit to the image side to the optical axis Z is the "effective radius" of the lens surface.
  • the "outside” here refers to the radial outside centered on the optical axis Z, that is, the side away from the optical axis Z.
  • the distance from the intersection of the object side surface of the lens Lx and the light beam Xb1 to the optical axis Z is the effective radius Effx of the object side surface of the lens Lx.
  • the position of the intersection of the outermost light beam and the lens surface is the position Px of the maximum effective diameter.
  • the upper ray of the off-axis light beam Xb is the outermost ray, but which ray is the outermost ray varies depending on the optical system.
  • the front group GF may be configured to include at least one positive lens.
  • the imaging lens satisfies the following conditional expression (29).
  • the focal length of the positive lens with the strongest refractive power among the positive lenses included in the front group GF is set to fFp.
  • conditional expression (28) By making sure that the corresponding value of conditional expression (28) is not equal to or more than the upper limit, the refractive power of the positive lens in the front group GF does not become too strong, making it easy to correct various aberrations such as spherical aberration.
  • 0.1 ⁇ f/fFp ⁇ 3 (29)
  • conditional expression (29) it is preferable to change the lower limit of conditional expression (29) from 0.1 to 0.2 or 0.3. It is also preferable to change the upper limit of conditional expression (29) from 3 to 2 or 1.5.
  • the rear group GR may be configured to include at least one positive lens.
  • the imaging lens satisfies the following conditional expression (30).
  • the focal length of the positive lens with the strongest refractive power among the positive lenses included in the rear group GR is taken as fRp.
  • conditional expression (30) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (30) from 0.3 to 0.6 or 0.8. It is also preferable to change the upper limit of conditional expression (30) from 5 to 4 or 3.2.
  • the imaging lens satisfies the following conditional expression (31).
  • the Abbe number based on the d-line of the positive lens in the cemented lens in the rear group GR is vRp.
  • the Abbe number based on the d-line of the negative lens in the cemented lens in the rear group GR is vRn.
  • the lower limit of condition (31) of 10 can be changed to 20 or 2 It is preferable to set the upper limit of condition (31) from 75 to 70 or 68.
  • the imaging lens satisfies the following conditional expression (32).
  • the refractive index of the positive lens of the cemented lens in the rear group GR with respect to the d-line is NRp.
  • the refractive index of the negative lens of the cemented lens in the rear group GR with respect to the d-line is NRn.
  • conditional expression (32) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (32) from 0.2 to 0.3 or 0.35. Also, it is preferable to change the upper limit of conditional expression (32) from 0.9 to 0.7 or 0.6.
  • an LFe lens which is a positive lens
  • at least one of the object side surface and the image side surface of the LFe lens may be configured to be aspheric.
  • the imaging lens satisfies the following conditional expression (33).
  • the paraxial radius of curvature of the object side surface of the LFe lens is RcLFef.
  • the paraxial radius of curvature of the image side surface of the LFe lens is RcLFer.
  • the radius of curvature at the position of the maximum effective diameter of the object side surface of the LFe lens is RyLFef.
  • the radius of curvature at the position of the maximum effective diameter of the image side surface of the LFe lens is RyLFer.
  • the lower limit of condition (33) In order to obtain better characteristics, it is preferable to change the lower limit of condition (33) from 0.5 to any of 0.7, 0.9, and 1.1. It is also preferable to change the upper limit of condition (33) from 7 to any of 5.7, 4.5, and 3.5.
  • conditional expression (34) specifies the shape factor of the LFe lens. By ensuring that the corresponding value of conditional expression (34) is not equal to or lower than the lower limit, it becomes easy to satisfactorily correct astigmatism. By ensuring that the corresponding value of conditional expression (34) is not equal to or higher than the upper limit, it becomes easy to satisfactorily correct spherical aberration. ⁇ 4 ⁇ (RcLFef ⁇ RcLFer)/(RcLFef+RcLFer) ⁇ 10 (34)
  • the imaging lens satisfies the following conditional expression (35 ) is preferably satisfied.
  • conditional expression (35 ) By making the value corresponding to condition (35) not smaller than the lower limit, correction of chromatic aberration becomes easier.
  • value corresponding to condition (35) not larger than the upper limit materials that are highly available can be used, making it easier to achieve good correction of various aberrations other than chromatic aberration. 15 ⁇ LFe ⁇ 90 (35)
  • the imaging lens satisfies the following conditional formula (36).
  • the center thickness D1 is shown in FIG. 2.
  • the center thickness D1 of the first lens does not become too thin, and it is possible to increase the strength of the optical system against external impacts.
  • the center thickness D1 of the first lens does not become too thick, which can contribute to reducing the weight of the optical system.
  • conditional expression (36) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (36) from 0.007 to 0.01 or 0.011. It is also preferable to change the upper limit of conditional expression (36) from 0.1 to 0.08 or 0.06.
  • the imaging lens satisfies the following conditional expression (37).
  • the "height of the maximum effective diameter” here refers to the distance from the optical axis Z to the position of the maximum effective diameter.
  • the thickness DH1 is shown in FIG. 2.
  • the conditional expression (37) is an expression related to the ratio of the thickness on the optical axis and off the optical axis of the first lens. By making the corresponding value of the conditional expression (37) not equal to or less than the lower limit, the thickness ratio of the first lens does not become too small, making it easy to correct astigmatism and distortion. By making the corresponding value of the conditional expression (37) not equal to or more than the upper limit, the thickness ratio of the first lens does not become too large, making it easy to manufacture the first lens. 2 ⁇ DH1/D1 ⁇ 10 (37)
  • the imaging lens satisfies the following conditional expression (38).
  • conditional expression (38) By making the corresponding value of conditional expression (38) not equal to or less than the lower limit, correction of chromatic aberration becomes easy.
  • conditional expression (38) By making the corresponding value of conditional expression (38) not equal to or more than the upper limit, it becomes possible to use a material that is highly available, and therefore it becomes easy to realize good correction of various aberrations other than chromatic aberration.
  • conditional expression (38) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (38) from 30 to 40 or 45. It is also preferable to change the upper limit of conditional expression (38) from 95 to 92 or 90.
  • the imaging lens satisfies the following conditional expression (39).
  • conditional expression (39) By making sure that the corresponding value of conditional expression (39) is not equal to or less than the lower limit, it is advantageous to ensure a sufficient amount of peripheral light.
  • the corresponding value of conditional expression (39) is not equal to or greater than the upper limit, it is possible to suppress an increase in the diameter of the first lens, so that This allows for a smaller and lighter camera, which also contributes to improving the degree of freedom in the arrangement of the mechanism for holding the lens.
  • conditional expression (39) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (39) from 0.7 to 0.8 or 0.9. It is also preferable to change the upper limit of conditional expression (39) from 2 to 1.7 or 1.5.
  • the imaging lens preferably includes at least one Ls lens that satisfies the following conditional expressions (40), (41), (42), and (43) on the image side of the second lens.
  • the refractive index of the Ls lens with respect to the d-line is denoted as NLs.
  • the Abbe number of the Ls lens based on the d-line is denoted as ⁇ Ls.
  • the partial dispersion ratio between the g-line and the F-line of the Ls lens is denoted as ⁇ gFLs.
  • the lens L13 corresponds to the Ls lens.
  • conditional expression (40) By ensuring that the corresponding value of conditional expression (40) is not below the lower limit, it becomes easier to correct chromatic aberration. By ensuring that the corresponding value of conditional expression (40) is not above the upper limit, it becomes easier to effectively correct spherical aberration and chromatic aberration at the same time.
  • conditional expression (41) By ensuring that the corresponding value of conditional expression (41) is not below the lower limit, chromatic aberration can be easily corrected. By ensuring that the corresponding value of conditional expression (41) is not above the upper limit, materials that are highly available can be used, making it easier to achieve good correction of aberrations other than chromatic aberration.
  • conditional expression (41) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (41) from 49.8 to 50.1 or 50.2. Also, it is preferable to change the upper limit of conditional expression (41) from 65 to 63 or 59.
  • conditional expression (42) By ensuring that the corresponding value of conditional expression (42) is not below the lower limit, chromatic aberration can be easily corrected. By ensuring that the corresponding value of conditional expression (42) is not above the upper limit, materials that are highly available can be used, making it easier to achieve good correction of aberrations other than chromatic aberration.
  • conditional expression (42) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (42) from 0.543 to 0.544 or 0.5445. It is also preferable to change the upper limit of conditional expression (42) from 0.58 to 0.57 or 0.563.
  • condition (43) By making the value corresponding to condition (43) not smaller than the lower limit, chromatic aberration can be easily corrected, and by making the value corresponding to condition (43) not larger than the upper limit, materials that are highly available can be used, making it easier to achieve good correction of aberrations other than chromatic aberration.
  • FIG. 1 is just one example, and various modifications are possible without departing from the spirit of the technology disclosed herein.
  • the number of lenses included in the front group GF, rear group GR, and focusing lens group may be different from that in the example of FIG. 1.
  • the first focusing lens group Gf1 and the second focusing lens group Gf2 are arranged contiguously, but in the imaging lens of the present disclosure, the first focusing lens group Gf1 and the second focusing lens group Gf2 may be arranged discontinuously.
  • the focusing lens groups may be arranged in positions different from those shown in the example of FIG. 1.
  • a first focusing lens group Gf1 may be arranged in the front group GF
  • a second focusing lens group Gf2 may be arranged in the rear group GR.
  • both the first focusing lens group Gf1 and the second focusing lens group Gf2 may be configured to move toward the image side, or both of them may be configured to move toward the object side.
  • the imaging lens in the example of FIG. 1 has two focusing lens groups
  • the imaging lens of the present disclosure may be configured to have only one focusing lens group. In this way, when there is only one lens group that moves during focusing, the mechanism can be simplified.
  • this focusing lens group may be configured to be arranged in the rear group GR.
  • the focusing lens group By arranging the focusing lens group in the rear group GR, it is advantageous to make the diameter of the focusing lens group smaller.
  • the imaging lens includes only one focusing lens group and this focusing lens group is disposed in the rear group GR, it is preferable that the imaging lens satisfies the following conditional expression (11).
  • the focal length of the focusing lens group is taken as ff.
  • conditional expression (11) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (11) from 0.05 to any of 0.09, 0.12, and 0.15. It is also preferable to change the upper limit of conditional expression (11) from 0.9 to any of 0.75, 0.65, and 0.55.
  • the imaging lens includes only one focusing lens group and this focusing lens group is disposed in the rear group GR, it is preferable that the imaging lens satisfies the following conditional expression (12).
  • conditional expression (12) By making sure that the corresponding value of conditional expression (12) is not below the lower limit, the refractive power of the focusing lens group does not become too weak, and the amount of movement of the focusing lens group during focusing can be suppressed.
  • the corresponding value of conditional expression (12) is not above the upper limit, it becomes easy to suppress aberration fluctuations during focusing.
  • conditional expression (12) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (12) from 0.1 to any of 0.45, 0.75, and 1. It is also preferable to change the upper limit of conditional expression (12) from 6 to any of 4.5, 4, and 3.5.
  • the imaging lens includes only one focusing lens group and this focusing lens group is disposed in the rear group GR
  • the imaging lens satisfies the following conditional expression (13).
  • the composite focal length of all the lenses on the image side of the focusing lens group is ff_r.
  • conditional expression (13) By making the corresponding value of conditional expression (13) not equal to or more than the upper limit, the composite refractive power of all the lenses on the image side of the focusing lens group does not become too strong, which is advantageous for correcting distortion aberration and curvature of field.
  • the imaging lens includes only one focusing lens group and this focusing lens group is disposed in the rear group GR
  • the imaging lens satisfies the following conditional expression (14).
  • the composite focal length of all lenses on the object side of the focusing lens group is ff_f.
  • conditional expression (14) By making the corresponding value of conditional expression (14) not equal to or more than the upper limit, the negative composite refractive power of all lenses on the object side of the focusing lens group does not become too weak, which is advantageous for correcting distortion and curvature of field. ⁇ 3 ⁇ f/ff_f ⁇ 0 (14)
  • this focusing lens group may be configured to be located in the front group GF.
  • the imaging lens includes only one focusing lens group, this focusing lens group may be configured to be located in the front group GF.
  • the aperture diaphragm St is fixed with respect to the image plane Sim during focusing, but in the imaging lens of the present disclosure, the focusing lens group may include the aperture diaphragm St, and the aperture diaphragm St may be configured to move along the optical axis Z during focusing. In this case, it is advantageous to suppress aberration fluctuation during focusing.
  • the focusing lens group includes the aperture diaphragm St and at least one lens, it is preferable that all lenses included in the focusing lens group and the aperture diaphragm St move together during focusing. In this case, the mechanism can be simplified. Note that "moving together" means moving the same amount in the same direction at the same time.
  • the imaging lens satisfies the following conditional expression (15).
  • the focal length of the focusing lens group including the aperture diaphragm St that moves during focusing is designated as ffs.
  • a preferred embodiment of the imaging lens of the present disclosure comprises, in order from the object side to the image side, a front group GF, an aperture stop St, and a rear group GR, and the front group GF includes, in succession from the most object side to the image side, a first lens which is a negative lens with a concave surface facing the image side, and a second lens which is a negative lens with a concave surface facing the image side, and two or less focusing lens groups are arranged on the image side of the second lens, and during focusing, the two or less focusing lens groups move along the optical axis Z, and the lenses other than the two or less focusing lens groups are fixed with respect to the image surface Sim, and the above conditional formula (1) is satisfied.
  • Example 1 A cross-sectional view of the configuration of the imaging lens of Example 1 is shown in Figure 1, and since the method of illustration and the configuration are as described above, some overlapping explanations will be omitted here.
  • the imaging lens of Example 1 is composed of, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the front group GF includes a first focusing lens group Gf1 having positive refractive power and a second focusing lens group Gf2 having positive refractive power.
  • the front group GF consists of seven lenses, lenses L11 to L17, from the object side to the image side.
  • the rear group GR consists of six lenses, lenses L21 to L26, from the object side to the image side.
  • the first focusing lens group Gf1 consists of lens L15.
  • the second focusing lens group Gf2 consists of lenses L16 and L17.
  • the basic lens data is shown in Table 1, the specifications in Table 2, the variable surface spacing in Table 3, and the aspheric coefficients in Table 4.
  • the table of basic lens data is written as follows.
  • the Sn column shows the surface numbers when the surface closest to the object is designated as the first surface and the numbers increase by one toward the image side.
  • the R column shows the radius of curvature of each surface.
  • the D column shows the surface distance on the optical axis between each surface and its adjacent surface on the image side.
  • the Nd column shows the refractive index for the d-line of each component.
  • the ⁇ d column shows the Abbe number of each component based on the d-line.
  • the ⁇ gF column shows the partial dispersion ratio between the g-line and F-line of each component.
  • the leftmost column of the row of lenses corresponding to each focusing lens group shows the reference code of that focusing lens group. For example, "Gf1" in the left column of surfaces 9 to 10 in Table 1 indicates that surfaces 9 to 10 correspond to the first focusing lens group Gf1.
  • the sign of the radius of curvature of a surface with a convex shape facing the object side is positive, and the sign of the radius of curvature of a surface with a convex shape facing the image side is negative.
  • the surface number column for the surface corresponding to aperture stop St the surface number and the word (St) are entered.
  • the value in the bottom row of the D column in the table is the distance between the surface closest to the image side in the table and the image plane Sim.
  • the symbol DD is used for the variable surface distance during focusing, and the surface number on the object side of this distance is added after DD and entered in the surface distance column.
  • Table 2 shows the focal length f, back focus Bf, maximum F-number FNo, and maximum full angle of view 2 ⁇ m based on the d-line. In the maximum full angle of view column, [°] indicates that the unit is degrees. Table 2 shows the values when focused on an object at infinity.
  • Table 3 shows the variable surface spacing when focusing.
  • the "Infinity” column shows the surface spacing when focused on an object at infinity.
  • the absolute value of the shooting magnification when focused on the closest object i.e., the absolute value of the maximum shooting magnification, is shown, and in that column, the variable surface spacing when focused on the closest object is shown.
  • the surface numbers of the aspheric surfaces are marked with *, and the numerical value of the paraxial radius of curvature is written in the column of the radius of curvature of the aspheric surface.
  • Table 4 the row of Sn shows the surface numbers of the aspheric surfaces, and the rows of KA and Am show the numerical values of the aspheric coefficients for each aspheric surface.
  • KA and Am are aspheric coefficients in the aspheric formula expressed by the following formula.
  • Zd C x h2 / ⁇ 1 + (1 - KA x C2 x h2 ) 1/2 ⁇ + ⁇ Am x hm however,
  • Zd Aspheric depth (the length of a perpendicular line drawn from a point on the aspheric surface at height h to a plane perpendicular to the optical axis Z where the apex of the aspheric surface is in contact)
  • h Height (distance from optical axis Z to lens surface)
  • C reciprocal of paraxial radius of curvature KA
  • Am aspheric coefficients, and ⁇ in the aspheric formula represents the summation with respect to m.
  • the angle unit is degrees and the length unit is mm (millimeters), but since the optical system can be used with proportional enlargement or reduction, other appropriate units can also be used. Also, in each table below, values are listed rounded to a predetermined number of decimal places.
  • Figure 4 shows each aberration diagram of the imaging lens of Example 1. From the left, Figure 4 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration.
  • the upper row labeled "infinity” shows each aberration diagram when focused on an object at infinity
  • the aberrations at the d-line, C-line, and F-line are shown by solid lines, long dashed lines, and short dashed lines, respectively.
  • the aberration at the d-line in the sagittal direction is shown by solid lines
  • the aberration at the d-line in the tangential direction is shown by short dashed lines.
  • the aberration at the d-line is shown by solid lines.
  • the aberration at the C-line and F-line are shown by long dashed lines and short dashed lines, respectively.
  • the FNo. and ⁇ in the upper aberration diagrams correspond to the FNo and ⁇ m in the conditional equations mentioned above.
  • Example 2 shows a cross-sectional view of the configuration of the imaging lens of Example 2.
  • the imaging lens of Example 2 comprises, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the front group GF includes a first focusing lens group Gf1 having positive refractive power
  • the rear group GR includes a second focusing lens group Gf2 having positive refractive power.
  • the front group GF consists of seven lenses, lenses L11 to L17, from the object side to the image side.
  • the rear group GR consists of six lenses, lenses L21 to L26, from the object side to the image side.
  • the first focusing lens group Gf1 consists of lens L15.
  • the second focusing lens group Gf2 consists of lens L23.
  • the basic lens data is shown in Table 5, the specifications in Table 6, the variable surface spacing in Table 7, the aspheric coefficients in Table 8, and the various aberration diagrams in Figure 6.
  • Example 3 shows a cross-sectional view of the configuration of the imaging lens of Example 3.
  • the imaging lens of Example 3 comprises, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the front group GF includes a first focusing lens group Gf1 having positive refractive power
  • the rear group GR includes a second focusing lens group Gf2 having negative refractive power.
  • the front group GF consists of seven lenses, lenses L11 to L17, from the object side to the image side.
  • the rear group GR consists of six lenses, lenses L21 to L26, from the object side to the image side.
  • the first focusing lens group Gf1 consists of lens L15.
  • the second focusing lens group Gf2 consists of lenses L21 and L22.
  • the basic lens data is shown in Table 9, the specifications in Table 10, the variable surface spacing in Table 11, the aspheric coefficients in Table 12, and the various aberration diagrams in Figure 8.
  • Example 4 A cross-sectional view of the configuration of the imaging lens of Example 4 is shown in Figure 9.
  • the imaging lens of Example 4 is composed of, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the imaging lens of Example 4 has only one focusing lens group.
  • the focusing lens group will be referred to as a single focusing lens group Gf.
  • the front group GF includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, lenses L11 to L16, from the object side to the image side.
  • the rear group GR consists of six lenses, lenses L21 to L26, from the object side to the image side.
  • the single focusing lens group Gf consists of lenses L13 and L14. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the image side, and the other lenses and aperture stop St are fixed with respect to the image plane Sim.
  • the basic lens data is shown in Table 13, the specifications in Table 14, the variable surface spacing in Table 15, the aspheric coefficients in Table 16, and the various aberration diagrams in Figure 10.
  • Example 5 shows a cross-sectional view of the configuration of the imaging lens of Example 5.
  • the imaging lens of Example 5 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the front group GF includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, L11 to L16, from the object side to the image side.
  • the rear group GR consists of six lenses, L21 to L26, from the object side to the image side.
  • the single focusing lens group Gf consists of lens L14. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves to the image side, and the other lenses and aperture stop St are fixed with respect to the image plane Sim.
  • the basic lens data is shown in Table 17, the specifications in Table 18, the variable surface spacing in Table 19, the aspheric coefficients in Table 20, and the various aberration diagrams in FIG. 12.
  • Example 6 shows a cross-sectional view of the configuration of the imaging lens of Example 6.
  • the imaging lens of Example 6 is composed of, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a first focusing lens group Gf1 having positive refractive power and a second focusing lens group Gf2 having positive refractive power.
  • the front group GF consists of seven lenses, lenses L11 to L17, from the object side to the image side.
  • the rear group GR consists of seven lenses, lenses L21 to L27, from the object side to the image side.
  • the first focusing lens group Gf1 consists of lens L21.
  • the second focusing lens group Gf2 consists of lenses L24 and L25.
  • the basic lens data is shown in Table 21, the specifications in Table 22, the variable surface spacing in Table 23, the aspheric coefficients in Table 24, and the various aberration diagrams in Figure 14.
  • Example 7 shows a cross-sectional view of the configuration of the imaging lens of Example 7.
  • the imaging lens of Example 7 is composed of, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a first focusing lens group Gf1 having positive refractive power and a second focusing lens group Gf2 having negative refractive power.
  • the front group GF consists of seven lenses, lenses L11 to L17, from the object side to the image side.
  • the rear group GR consists of seven lenses, lenses L21 to L27, from the object side to the image side.
  • the first focusing lens group Gf1 consists of five lenses, lenses L21 to L25.
  • the second focusing lens group Gf2 consists of lens L26.
  • the basic lens data is shown in Table 25, the specifications in Table 26, the variable surface spacing in Table 27, the aspheric coefficients in Table 28, and the various aberration diagrams in Figure 16.
  • Example 8 shows a cross-sectional view of the configuration of the imaging lens of Example 8.
  • the imaging lens of Example 8 is composed of, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a first focusing lens group Gf1 having positive refractive power and a second focusing lens group Gf2 having negative refractive power.
  • the front group GF consists of seven lenses, lenses L11 to L17, from the object side to the image side.
  • the rear group GR consists of seven lenses, lenses L21 to L27, from the object side to the image side.
  • the first focusing lens group Gf1 consists of four lenses, lenses L22 to L25.
  • the second focusing lens group Gf2 consists of lens L26.
  • the basic lens data is shown in Table 29, the specifications in Table 30, the variable surface spacing in Table 31, the aspheric coefficients in Table 32, and the various aberration diagrams in Figure 18.
  • Example 9 shows a cross-sectional view of the configuration of the imaging lens of Example 9.
  • the imaging lens of Example 9 comprises, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having negative refractive power.
  • the front group GF is made up of eight lenses, lenses L11 to L18, in that order from the object side to the image side.
  • the rear group GR is composed of six lenses, lenses L21 to L26, in that order from the object side to the image side.
  • the single focusing lens group Gf is composed of lens L25. When focusing from an object at infinity to a closest object, the single focusing lens group Gf moves toward the image side, and the other lenses and the aperture stop St are fixed with respect to the image surface Sim.
  • the basic lens data is shown in Table 33, the specifications in Table 34, the variable surface spacing in Table 35, the aspheric coefficients in Table 36, and the various aberration diagrams in Figure 20.
  • Example 10 shows a cross-sectional view of the configuration of the imaging lens of Example 10.
  • the imaging lens of Example 10 is composed of, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having negative refractive power.
  • the front group GF consists of eight lenses, lenses L11 to L18, from the object side to the image side.
  • the rear group GR consists of six lenses, lenses L21 to L26, from the object side to the image side.
  • the single focusing lens group Gf consists of lens L25. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the image side, and the other lenses and aperture stop St are fixed with respect to the image plane Sim.
  • the basic lens data is shown in Table 37, the specifications in Table 38, the variable surface spacing in Table 39, the aspheric coefficients in Table 40, and the various aberration diagrams in Figure 22.
  • Example 11 shows a cross-sectional view of the configuration of the imaging lens of Example 11.
  • the imaging lens of Example 11 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, L11 to L16, from the object side to the image side.
  • the rear group GR consists of six lenses, L21 to L26, from the object side to the image side.
  • the single focusing lens group Gf consists of five lenses, L21 to L25. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 41, the specifications in Table 42, the variable surface spacing in Table 43, the aspheric coefficients in Table 44, and the various aberration diagrams in Figure 24.
  • Example 12 shows a cross-sectional view of the configuration of the imaging lens of Example 12.
  • the imaging lens of Example 12 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, L11 to L16, from the object side to the image side.
  • the rear group GR consists of six lenses, L21 to L26, from the object side to the image side.
  • the single focusing lens group Gf consists of five lenses, L21 to L25. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 45, the specifications in Table 46, the variable surface spacing in Table 47, the aspheric coefficients in Table 48, and the various aberration diagrams in Figure 26.
  • Example 13 shows a cross-sectional view of the configuration of the imaging lens of Example 13.
  • the imaging lens of Example 13 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, L11 to L16, from the object side to the image side.
  • the rear group GR consists of six lenses, L21 to L26, from the object side to the image side.
  • the single focusing lens group Gf consists of five lenses, L21 to L25. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 49, the specifications in Table 50, the variable surface spacing in Table 51, the aspheric coefficients in Table 52, and each aberration diagram in Figure 28.
  • Example 14 shows a cross-sectional view of the configuration of the imaging lens of Example 14.
  • the imaging lens of Example 14 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, L11 to L16, from the object side to the image side.
  • the rear group GR consists of seven lenses, L21 to L27, from the object side to the image side.
  • the single focusing lens group Gf consists of six lenses, L21 to L26. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 53, the specifications in Table 54, the variable surface spacing in Table 55, the aspheric coefficients in Table 56, and the various aberration diagrams in Figure 30.
  • Example 15 shows a cross-sectional view of the configuration of the imaging lens of Example 15.
  • the imaging lens of Example 15 is composed of, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, L11 to L16, from the object side to the image side.
  • the rear group GR consists of seven lenses, L21 to L27, from the object side to the image side.
  • the single focusing lens group Gf consists of six lenses, L21 to L26. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 57, the specifications in Table 58, the variable surface spacing in Table 59, the aspheric coefficients in Table 60, and the various aberration diagrams in Figure 32.
  • Example 16 shows a cross-sectional view of the configuration of the imaging lens of Example 16.
  • the imaging lens of Example 16 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of six lenses, L11 to L16, from the object side to the image side.
  • the rear group GR consists of seven lenses, L21 to L27, from the object side to the image side.
  • the single focusing lens group Gf consists of six lenses, L21 to L26. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 61, the specifications in Table 62, the variable surface spacing in Table 63, the aspheric coefficients in Table 64, and each aberration diagram in Figure 34.
  • Example 17 shows a cross-sectional view of the configuration of the imaging lens of Example 17.
  • the imaging lens of Example 17 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of seven lenses, L11 to L17, from the object side to the image side.
  • the rear group GR consists of seven lenses, L21 to L27, from the object side to the image side.
  • the single focusing lens group Gf consists of six lenses, L21 to L26. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 65, the specifications in Table 66, the variable surface spacing in Table 67, the aspheric coefficients in Table 68, and each aberration diagram in Figure 36.
  • Example 18 shows a cross-sectional view of the configuration of the imaging lens of Example 18.
  • the imaging lens of Example 18 is composed of, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of seven lenses, L11 to L17, from the object side to the image side.
  • the rear group GR consists of seven lenses, L21 to L27, from the object side to the image side.
  • the single focusing lens group Gf consists of six lenses, L21 to L26. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 69, the specifications in Table 70, the variable surface spacing in Table 71, the aspheric coefficients in Table 72, and the various aberration diagrams in Figure 38.
  • Example 19 A cross-sectional view of the configuration of the imaging lens of Example 19 is shown in Fig. 39.
  • the imaging lens of Example 19 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of seven lenses, L11 to L17, from the object side to the image side.
  • the rear group GR consists of seven lenses, L21 to L27, from the object side to the image side.
  • the single focusing lens group Gf consists of six lenses, L21 to L26. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 73, the specifications in Table 74, the variable surface spacing in Table 75, the aspheric coefficients in Table 76, and the various aberration diagrams in Figure 40.
  • Example 20 shows a cross-sectional view of the configuration of the imaging lens of Example 20.
  • the imaging lens of Example 20 comprises, in order from the object side to the image side, a front group GF having negative refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the rear group GR includes a single focusing lens group Gf having positive refractive power.
  • the front group GF consists of seven lenses, L11 to L17, from the object side to the image side.
  • the rear group GR consists of seven lenses, L21 to L27, from the object side to the image side.
  • the single focusing lens group Gf consists of six lenses, L21 to L26. When focusing from an object at infinity to the closest object, the single focusing lens group Gf moves toward the object side, and the other lenses and aperture stop St are fixed relative to the image plane Sim.
  • the basic lens data is shown in Table 77, the specifications in Table 78, the variable surface spacing in Table 79, the aspheric coefficients in Table 80, and each aberration diagram in Figure 42.
  • Example 21 A cross-sectional view of the configuration of the imaging lens of Example 21 is shown in Fig. 43.
  • the imaging lens of Example 21 is composed of, in order from the object side to the image side, a front group GF having positive refractive power, an aperture stop St, and a rear group GR having positive refractive power.
  • the imaging lens includes a single focusing lens group Gf.
  • the front group GF is made up of eight lenses, lenses L11 to L18, in that order from the object side to the image side.
  • the rear group GR is composed of six lenses, lenses L21 to L26, in that order from the object side to the image side.
  • the single focusing lens group Gf is composed of lenses L17 to L18, an aperture stop St, and lenses L21 to L24. When focusing from an object at infinity to a closest object, the single focusing lens group Gf moves toward the object side, and the other lenses are fixed with respect to the image surface Sim.
  • the basic lens data is shown in Table 81, the specifications in Table 82, the variable surface spacing in Table 83, the aspheric coefficients in Table 84, and each aberration diagram in Figure 44.
  • Tables 85 to 94 show the corresponding values of conditional expressions (1) to (43) for the imaging lenses of Examples 1 to 21.
  • the reference code of the corresponding lens is written in parentheses under each corresponding value.
  • the corresponding values of the examples shown in Tables 85 to 94 may be used as the upper or lower limits of the conditional expressions to set preferred ranges for the conditional expressions.
  • the imaging lenses of Examples 1 to 21 have a wide angle of view, with a total angle of view greater than 100 degrees.
  • the imaging lenses of Examples 1 to 21 have an open F-number of less than 2 when focused on an object at infinity, realizing an optical system with a small F-number.
  • the imaging lenses of Examples 1 to 21 are compact, yet maintain high optical performance with various aberrations well corrected both when focused on an object at infinity and when focused on the closest object.
  • Figs. 45 and 46 show external views of a camera 30, which is an imaging device according to an embodiment of the present disclosure.
  • Fig. 45 shows a perspective view of the camera 30 seen from the front side
  • Fig. 46 shows a perspective view of the camera 30 seen from the rear side.
  • the camera 30 is a so-called mirrorless type digital camera, to which an interchangeable lens 20 can be removably attached.
  • the interchangeable lens 20 is configured to include an imaging lens 1 according to an embodiment of the present disclosure housed in a lens barrel.
  • Camera 30 has a camera body 31, and a shutter button 32 and a power button 33 are provided on the top surface of camera body 31.
  • operation units 34, 35, and a display unit 36 are provided on the back surface of camera body 31.
  • Display unit 36 is capable of displaying a captured image and an image within the angle of view before capture.
  • a shooting aperture through which light from the subject is incident is provided in the center of the front of the camera body 31, and a mount 37 is provided at a position corresponding to the shooting aperture, and the interchangeable lens 20 is attached to the camera body 31 via the mount 37.
  • the camera body 31 contains an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) that outputs an imaging signal corresponding to the subject image formed by the interchangeable lens 20, a signal processing circuit that processes the imaging signal output from the imaging element to generate an image, and a recording medium for recording the generated image.
  • an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) that outputs an imaging signal corresponding to the subject image formed by the interchangeable lens 20, a signal processing circuit that processes the imaging signal output from the imaging element to generate an image, and a recording medium for recording the generated image.
  • CMOS Complementary Metal Oxide Semiconductor
  • the technology of the present disclosure has been described above using embodiments and examples, but the technology of the present disclosure is not limited to the above embodiments and examples, and various modifications are possible.
  • the radius of curvature, surface spacing, refractive index, Abbe number, aspheric coefficient, etc. of each lens are not limited to the values shown in the above examples, and may take other values.
  • the imaging device is not limited to the above example, and can take various forms, such as cameras other than mirrorless type, film cameras, and video cameras.
  • the front group includes, in order from the most object side to the image side, a first lens which is a negative lens having a concave surface facing the image side, and a second lens which is a negative lens having a concave surface facing the image side, Two or less focusing lens groups are disposed on the image side of the second lens, During focusing, the two or less focusing lens groups move along an optical axis, and lenses other than the two or less focusing lens groups are fixed with respect to an image plane; The back focus of the entire system in the air equivalent distance when focused on an object at infinity is Bf.
  • the focal length of the entire system when focused on an object at infinity is f.
  • f The focal length of the entire system when focused on an object at infinity
  • ⁇ m 0.3 ⁇ Bf/(f ⁇ tan ⁇ m) ⁇ 1.5
  • the distance on the optical axis from the lens surface of the imaging lens closest to the object side to the aperture when the lens surface is focused on an object at infinity is defined as STI.
  • the focusing lens group includes the aperture, 11.
  • the imaging lens includes only one focusing lens group, If the focal length of the focusing lens group is ffs, 0.1 ⁇ f/ffs ⁇ 0.5 (15)
  • the focal length of the first focusing lens group is ff1
  • If the focal length of the second focusing lens group is ff2, 0.2 ⁇
  • the lateral magnification of the first focusing lens group when focused on an object at infinity is ⁇ f1
  • If the lateral magnification of the second focusing lens group in a state focused on an object at infinity is ⁇ f2, 0 ⁇
  • When the lateral magnification of the first focusing lens group in a state focused on an object at infinity is ⁇ f1, 0 ⁇ f1+(1/ ⁇ f1) ⁇ ⁇ 2 ⁇ 0.25
  • conditional expression (23) represented by: [Additional Item 28] The paraxial radius of curvature of the object side surface of the first lens is RL1f.
  • the imaging lens according to any one of supplementary items 1 to 28, which satisfies conditional expression (25) represented by: [Additional Item 30] a third lens which is a negative lens is disposed adjacent to the image side of the second lens, a fourth lens which is a positive lens is disposed adjacent to the image side of the third lens, The focal length of the third lens is fL3.
  • the paraxial radius of curvature of the object side surface of the lens closest to the image side of the imaging lens is RLef, When the paraxial curvature radius of the image-side surface of the lens closest to the image side of the imaging lens is RLer, 0.4 ⁇ (RLer-RLef)/(RLer+RLef) ⁇ 5.5
  • the paraxial radius of curvature of the image side surface of the first lens is RL1r.
  • the radius of curvature at the position of the maximum effective diameter of the object side surface of the first lens is RyL1f, When the radius of curvature at the position of the maximum effective diameter of the image side surface of the first lens is RyL1r, 0.5 ⁇ (1/RL1f-1/RL1r)/(1/RyL1f-1/RyL1r) ⁇ 7 (28)
  • At least one of the object side surface and the image side surface of the LFe lens is aspheric, The paraxial radius of curvature of the object side surface of the LFe lens is RcLFef, The paraxial radius of curvature of the image side surface of the LFe lens is RcLFer, The radius of curvature at the position of the maximum effective diameter of the object side surface of the LFe lens is RyLFef, When the radius of curvature at the position of the maximum effective diameter of the image side surface of the LFe lens is RyLFer, 0.5 ⁇ (1/RcLFef-1/RcLFer)/(1/RyLFef-1/RyLFer) ⁇ 7 (33)
  • DH1 is a thickness of the first lens in the optical axis direction at the height of the maximum effective diameter of the image side surface of the first lens;
  • the center thickness of the first lens is D1, 2 ⁇ DH1/D1 ⁇ 10
  • the Abbe number of the lens closest to the image side of the imaging lens based on the d-line is ⁇ Le, 30 ⁇ Le ⁇ 95 (38)

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WO2020213337A1 (ja) * 2019-04-17 2020-10-22 ソニー株式会社 光学系および撮像装置
JP2021193406A (ja) * 2020-06-08 2021-12-23 キヤノン株式会社 光学系およびそれを有する撮像装置
WO2022059463A1 (ja) * 2020-09-18 2022-03-24 ソニーグループ株式会社 広角レンズおよび撮像装置
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WO2020213337A1 (ja) * 2019-04-17 2020-10-22 ソニー株式会社 光学系および撮像装置
JP2021193406A (ja) * 2020-06-08 2021-12-23 キヤノン株式会社 光学系およびそれを有する撮像装置
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JP7819246B2 (ja) 2024-06-24 2026-02-24 キヤノン株式会社 光学系およびそれを有する撮像装置

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