WO2022172725A1 - 光学系、光学機器、および光学系の製造方法 - Google Patents

光学系、光学機器、および光学系の製造方法 Download PDF

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Publication number
WO2022172725A1
WO2022172725A1 PCT/JP2022/002148 JP2022002148W WO2022172725A1 WO 2022172725 A1 WO2022172725 A1 WO 2022172725A1 JP 2022002148 W JP2022002148 W JP 2022002148W WO 2022172725 A1 WO2022172725 A1 WO 2022172725A1
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Prior art keywords
lens group
focusing lens
focusing
optical system
focal length
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PCT/JP2022/002148
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English (en)
French (fr)
Japanese (ja)
Inventor
幸介 町田
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Nikon Corp
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Nikon Corp
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Priority to US18/271,465 priority Critical patent/US20240053582A1/en
Priority to CN202280012851.0A priority patent/CN116783532A/zh
Priority to JP2022581292A priority patent/JP7459981B2/ja
Publication of WO2022172725A1 publication Critical patent/WO2022172725A1/ja
Anticipated expiration legal-status Critical
Priority to JP2024036626A priority patent/JP7726314B2/ja
Priority to JP2025127397A priority patent/JP2025142329A/ja
Ceased legal-status Critical Current

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    • 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 -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • 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
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length

Definitions

  • the present invention relates to an optical system, an optical device, and a method of manufacturing an optical system.
  • Patent Document 1 optical systems suitable for photographic cameras, electronic still cameras, video cameras, etc.
  • Patent Document 1 it is difficult to suppress aberration fluctuations during focusing.
  • An optical system comprises a first lens group, a first focusing lens group having negative refractive power, and a first focusing lens group having positive refractive power, which are arranged in order from the object side along an optical axis. and two focusing lens groups, wherein when focusing, the first focusing lens group and the second focusing lens group move along the optical axis in different trajectories, and the first focusing lens It further has an aperture stop arranged closer to the object side than the group, and satisfies the following conditional expression. 0.68 ⁇ (-fF1)/fF2 ⁇ 3.60 where fF1: focal length of the first focusing lens group fF2: focal length of the second focusing lens group
  • An optical system comprises a first lens group, a first focusing lens group having negative refractive power, and a first focusing lens group having positive refractive power, which are arranged in order from the object side along the optical axis.
  • the lens system has two focusing lens groups and a subsequent lens group having a negative refractive power, and when focusing, the first focusing lens group and the second focusing lens group move along different trajectories on the optical axis. and further has an aperture stop located closer to the object side than the first focusing lens group, satisfying the following conditional expression. 0.60 ⁇ fF2/(-fR) ⁇ 1.10 where fF2: focal length of the second focusing lens group fR: focal length of the subsequent lens group
  • An optical system comprises a first lens group, a first focusing lens group having negative refractive power, and a first focusing lens group having positive refractive power, which are arranged in order from the object side along the optical axis. and two focusing lens groups, and when focusing, the first focusing lens group and the second focusing lens group move along the optical axis in mutually different trajectories, satisfying the following conditional expression: do. f1/
  • An optical system has a first lens group, an aperture stop, a first focusing lens group, and a second focusing lens group arranged in order from the object side along the optical axis. and during focusing, the first focusing lens group and the second focusing lens group move along different trajectories along the optical axis, and the first focusing lens group includes at least two negative lenses.
  • An optical device includes the above optical system.
  • a method for manufacturing an optical system includes a first lens group, a first focusing lens group having negative refractive power, and a positive refractive power, which are arranged in order from the object side along an optical axis. and a second focus lens group having and further has an aperture stop arranged closer to the object side than the first focusing lens group, and each lens is arranged in the lens barrel so as to satisfy the following conditional expression. 0.68 ⁇ (-fF1)/fF2 ⁇ 3.60 where fF1: focal length of the first focusing lens group fF2: focal length of the second focusing lens group
  • a method of manufacturing an optical system according to a second aspect of the present invention includes a first lens group, a first focusing lens group having negative refractive power, and a positive refractive power, which are arranged in order from the object side along the optical axis.
  • the lens barrel moves along the optical axis in mutually different trajectories, further has an aperture stop disposed closer to the object side than the first focusing lens group, and satisfies the following conditional expression: Place each lens in the 0.60 ⁇ fF2/(-fR) ⁇ 1.10 where fF2: focal length of the second focusing lens group fR: focal length of the subsequent lens group
  • a method for manufacturing an optical system includes a first lens group, a first focusing lens group having negative refractive power, and a positive refractive power, which are arranged in order from the object side along the optical axis. and a second focusing lens group having and position each lens in the lens barrel so that the following conditional expression is satisfied.
  • ⁇ 1.00 where f1 is the focal length of the first lens group, f1R is the combined focal length of the lens group arranged closer to the image side than the first lens group when in focus at infinity.
  • a method for manufacturing an optical system includes a first lens group, an aperture stop, a first focusing lens group, and a second focusing lens group, which are arranged in order from the object side along the optical axis. wherein, during focusing, the first focusing lens group and the second focusing lens group move along the optical axis in mutually different trajectories, and the first focusing lens group
  • the focal lens group arranges each lens within the lens barrel to have at least two negative lenses.
  • FIGS. 2A and 2B are diagrams of various aberrations of the optical system according to the first embodiment when focusing on infinity and when focusing on a short distance, respectively. It is a figure which shows the lens structure of the optical system which concerns on 2nd Example.
  • FIGS. 4A and 4B are diagrams of various aberrations of the optical system according to the second embodiment when focusing on infinity and when focusing on a short distance, respectively. It is a figure which shows the lens structure of the optical system which concerns on 3rd Example.
  • 6A and 6B are diagrams of various aberrations of the optical system according to the third embodiment when focusing on infinity and when focusing on a short distance, respectively. It is a figure showing composition of a camera provided with an optical system concerning each embodiment.
  • 4 is a flow chart showing a method for manufacturing an optical system according to the first embodiment; 8 is a flow chart showing a method for manufacturing an optical system according to the second embodiment; 9 is a flow chart showing a method for manufacturing an optical system according to the third embodiment; It is a flow chart which shows the manufacturing method of the optical system concerning a 4th embodiment.
  • the camera 1 comprises a main body 2 and a photographing lens 3 attached to the main body 2.
  • the main body 2 includes an imaging device 4 , a main body control section (not shown) that controls the operation of the digital camera, and a liquid crystal screen 5 .
  • the taking lens 3 includes an optical system OL consisting of a plurality of lens groups, and a lens position control mechanism (not shown) that controls the position of each lens group.
  • the lens position control mechanism includes a sensor that detects the position of the lens group, a motor that moves the lens group back and forth along the optical axis, a control circuit that drives the motor, and the like.
  • the light from the subject is condensed by the optical system OL of the photographing lens 3 and reaches the image plane I of the imaging device 4 .
  • the light from the subject reaching the image plane I is photoelectrically converted by the imaging device 4 and recorded as digital image data in a memory (not shown).
  • the digital image data recorded in the memory can be displayed on the liquid crystal screen 5 according to the user's operation.
  • This camera may be a mirrorless camera or a single-lens reflex type camera having a quick return mirror.
  • the optical system OL shown in FIG. 7 schematically shows an optical system provided in the photographing lens 3, and the lens configuration of the optical system OL is not limited to this configuration.
  • an optical system OL(1) as an example of the optical system OL according to the first embodiment includes a first lens group G1 arranged in order from the object side along the optical axis, and a negative refraction lens group G1. It comprises a first focusing lens group GF1 with power and a second focusing lens group GF2 with positive refractive power. During focusing, the first focusing lens group GF1 and the second focusing lens group GF2 move along the optical axis in different trajectories. Further, the optical system OL according to the first embodiment further has an aperture stop S arranged closer to the object side than the first focusing lens group GF1.
  • the optical system OL satisfies the following conditional expression (1). 0.68 ⁇ (-fF1)/fF2 ⁇ 3.60 (1) where fF1: focal length of the first focusing lens group GF1 fF2: focal length of the second focusing lens group GF2
  • the optical system OL according to the first embodiment may be the optical system OL(2) shown in FIG. 3 or the optical system OL(3) shown in FIG.
  • Conditional expression (1) defines an appropriate relationship between the focal length of the first focusing lens group GF1 and the focal length of the second focusing lens group GF2. By satisfying conditional expression (1), it is possible to suppress variations in various aberrations including spherical aberration during focusing.
  • conditional expression (1) If the corresponding value of conditional expression (1) exceeds the upper limit, the refractive power of the second focusing lens group GF2 becomes too strong, so that fluctuations in various aberrations including spherical aberration during focusing can be suppressed. become difficult.
  • the upper limit of conditional expression (1) By setting the upper limit of conditional expression (1) to 3.50, 3.30, 3.00, 2.75, 2.50, 2.20, 2.00, and further to 1.85, the present implementation The shape effect can be made more reliable.
  • conditional expression (1) When the corresponding value of conditional expression (1) is below the lower limit, the refractive power of the first focusing lens group GF1 becomes too strong, so that fluctuations in various aberrations including spherical aberration during focusing can be suppressed. become difficult.
  • the lower limit of conditional expression (1) By setting the lower limit of conditional expression (1) to 0.70, 0.72, 0.75, 0.78, 0.80, and further to 0.82, the effects of the present embodiment can be more assured. can be
  • an optical system OL(1) as an example of an optical system OL according to the second embodiment includes a first lens group G1 arranged in order from the object side along an optical axis, It comprises a first focusing lens group GF1 with power, a second focusing lens group GF2 with positive refractive power and a trailing lens group GR with negative refractive power.
  • the first focusing lens group GF1 and the second focusing lens group GF2 move along the optical axis in different trajectories.
  • the optical system OL according to the second embodiment further has an aperture stop S arranged closer to the object side than the first focusing lens group GF1.
  • the optical system OL according to the second embodiment satisfies the following conditional expression (2). 0.60 ⁇ fF2/(-fR) ⁇ 1.10 (2) where fF2: focal length of the second focusing lens group GF2 fR: focal length of the subsequent lens group GR
  • the optical system OL according to the second embodiment may be the optical system OL(2) shown in FIG. 3 or the optical system OL(3) shown in FIG.
  • Conditional expression (2) defines an appropriate relationship between the focal length of the second focusing lens group GF2 and the focal length of the subsequent lens group GR. By satisfying conditional expression (2), it is possible to suppress variations in various aberrations including spherical aberration during focusing.
  • conditional expression (2) If the corresponding value of conditional expression (2) exceeds the upper limit, the refractive power of the subsequent lens group GR becomes too strong, making it difficult to suppress fluctuations in various aberrations including spherical aberration during focusing. .
  • the upper limit of conditional expression (2) By setting the upper limit of conditional expression (2) to 1.08, 1.05, 1.03, 1.00, and further to 0.98, the effects of this embodiment can be made more reliable. can.
  • conditional expression (2) If the corresponding value of conditional expression (2) is below the lower limit, the refractive power of the second focusing lens group GF2 becomes too strong, so that fluctuations in various aberrations including spherical aberration during focusing can be suppressed. become difficult.
  • the lower limit of conditional expression (2) By setting the lower limit of conditional expression (2) to 0.62, and further to 0.64, the effects of this embodiment can be made more reliable.
  • the subsequent lens group GR preferably has at least two lens components.
  • a lens component indicates a single lens or a cemented lens.
  • an optical system OL(1) as an example of an optical system OL according to the third embodiment includes a first lens group G1 arranged in order from the object side along an optical axis, It comprises a first focusing lens group GF1 with power and a second focusing lens group GF2 with positive refractive power.
  • the first focusing lens group GF1 and the second focusing lens group GF2 move along the optical axis in different trajectories.
  • the optical system OL satisfies the following conditional expression (3). f1/
  • the optical system OL according to the third embodiment may be the optical system OL(2) shown in FIG. 3 or the optical system OL(3) shown in FIG.
  • Conditional expression (3) defines an appropriate relationship between the focal length of the first lens group G1 and the combined focal length of the lens groups arranged closer to the image side than the first lens group G1 when in focus at infinity. It is. By satisfying the conditional expression (3), it is possible to satisfactorily correct various aberrations including spherical aberration in the infinity focused state.
  • conditional expression (3) If the corresponding value of conditional expression (3) exceeds the upper limit, the refractive power of the lens group arranged closer to the image side than the first lens group G1 becomes too strong. It becomes difficult to correct various aberrations that occur.
  • Set the upper limit of conditional expression (3) to 0.90, 0.80, 0.75, 0.70, 0.65, 0.60, 0.55, 0.50, and further to 0.45 Therefore, the effects of the present embodiment can be made more reliable. Further, by setting the lower limit of conditional expression (3) to 0.05, 0.10, 0.15, 0.20, 0.25, and further to 0.30, the effect of the present embodiment can be obtained more reliably. can be
  • the optical system OL according to the third embodiment further includes an aperture stop S arranged closer to the object side than the first focusing lens group GF1. This makes it possible to suppress variations in various aberrations including spherical aberration during focusing.
  • an optical system OL(1) as an example of an optical system OL according to the fourth embodiment includes a first lens group G1, an aperture diaphragm S , a first focusing lens group GF1, and a second focusing lens group GF2.
  • the first focusing lens group GF1 and the second focusing lens group GF2 move along the optical axis in different trajectories.
  • the first focusing lens group GF1 has at least two negative lenses.
  • the optical system OL according to the fourth embodiment may be the optical system OL(2) shown in FIG. 3 or the optical system OL(3) shown in FIG.
  • the first focusing lens group GF1 has negative refractive power and the second focusing lens group GF2 has positive refractive power.
  • the optical system OL according to the second, third, and fourth embodiments desirably satisfies the conditional expression (1) described above. Satisfying conditional expression (1) makes it possible to suppress variations in various aberrations including spherical aberration during focusing, as in the first embodiment.
  • conditional expression (1) makes it possible to suppress variations in various aberrations including spherical aberration during focusing, as in the first embodiment.
  • the upper limit of conditional expression (1) to 3.50, 3.30, 3.00, 2.75, 2.50, 2.20, 2.00, and 1.85
  • each implementation The shape effect can be made more reliable.
  • the lower limit of conditional expression (1) to 0.70, 0.72, 0.75, 0.78, 0.80, and further to 0.82, the effect of each embodiment can be obtained more reliably.
  • the optical system OL according to the first, third, and fourth embodiments further includes a trailing lens group GR having negative refractive power arranged closer to the image side than the second focusing lens group GF2. and it is desirable to satisfy the above-mentioned conditional expression (2).
  • conditional expression (2) it is possible to suppress variations in various aberrations including spherical aberration during focusing, as in the second embodiment.
  • the upper limit of conditional expression (2) to 1.08, 1.05, 1.03, 1.00, and further to 0.98
  • the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (2) By setting the lower limit of conditional expression (2) to 0.62, and further to 0.64, the effect of each embodiment can be made more reliable.
  • the subsequent lens group GR preferably has at least two lens components. As a result, it is possible to satisfactorily correct various aberrations including coma when the lens is in focus at infinity.
  • the optical system OL according to the first, second, and fourth embodiments desirably satisfies the conditional expression (3) described above.
  • the conditional expression (3) As in the third embodiment, it is possible to satisfactorily correct various aberrations including spherical aberration in the infinity focused state.
  • the upper limit of conditional expression (3) to 0.90, 0.80, 0.75, 0.70, 0.65, 0.60, 0.55, 0.50, and further to 0.45
  • the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (3) to 0.05, 0.10, 0.15, 0.20, 0.25, and further to 0.30, the effect of each embodiment can be obtained more reliably.
  • the optical system OL according to the third embodiment further includes an aperture stop S arranged closer to the object side than the first focusing lens group GF1. This makes it possible to suppress variations in various aberrations including spherical aberration during focusing.
  • the optical system OL according to the first, second, and fourth embodiments desirably satisfies the following conditional expression (4).
  • the optical system OL according to the third embodiment further includes an aperture stop S arranged closer to the object side than the first focusing lens group GF1 and satisfy the following conditional expression (4). 0.50 ⁇ Lre/Lfr ⁇ 4.00 (4) where Lfr is the distance on the optical axis from the most object-side lens surface of the optical system OL to the aperture stop S, Lre is the distance on the optical axis from the aperture stop S to the image plane I
  • Conditional expression (4) expresses an appropriate relationship between the distance on the optical axis from the lens surface closest to the object side of the optical system OL to the aperture diaphragm S and the distance on the optical axis from the aperture diaphragm S to the image plane I. It stipulates. By satisfying the conditional expression (4), it is possible to satisfactorily correct various aberrations including spherical aberration in the infinity focused state.
  • conditional expression (4) If the corresponding value of conditional expression (4) exceeds the upper limit, the distance on the optical axis from the aperture stop S to the image plane I becomes too large, and various aberrations such as spherical aberration when in focus at infinity are produced. It becomes difficult to correct.
  • the upper limit of conditional expression (4) By setting the upper limit of conditional expression (4) to 3.80, 3.65, 3.50, 3.40, 3.30, 3.20, and further to 3.10, the effect of each embodiment is can be made more secure.
  • conditional expression (4) If the corresponding value of conditional expression (4) is below the lower limit, the distance on the optical axis from the lens surface closest to the object side of the optical system OL to the aperture stop S becomes too large, and spherical aberration in the infinity focused state It becomes difficult to correct various aberrations including .
  • Each implementation The shape effect can be made more reliable.
  • the optical system OL preferably satisfies the following conditional expression (5). 0.45 ⁇ f1/(-fF1) ⁇ 2.50 (5) where f1: focal length of the first lens group G1 fF1: focal length of the first focusing lens group GF1
  • Conditional expression (5) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the first focusing lens group GF1.
  • conditional expression (5) If the corresponding value of conditional expression (5) exceeds the upper limit, the refracting power of the first focusing lens group GF1 becomes too strong. It becomes difficult to suppress fluctuations in various aberrations.
  • Set the upper limit of conditional expression (5) to 2.35, 2.20, 2.10, 2.00, 1.85, 1.70, 1.50, 1.40, and 1.35. , the effect of each embodiment can be made more reliable.
  • conditional expression (5) falls below the lower limit, the refractive power of the first lens group G1 becomes too strong, making it difficult to correct various aberrations including spherical aberration when in focus at infinity. Become.
  • the lower limit of conditional expression (5) 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, and further to 0.80, the effect of each embodiment is can be made more secure.
  • the optical system OL preferably satisfies the following conditional expression (6). 0.55 ⁇ f1/fF2 ⁇ 3.00 (6) where f1: focal length of the first lens group G1 fF2: focal length of the second focusing lens group GF2
  • Conditional expression (6) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the second focusing lens group GF2.
  • conditional expression (6) If the corresponding value of conditional expression (6) exceeds the upper limit, the refractive power of the second focusing lens group GF2 becomes too strong, causing spherical aberration and other problems when focusing from an object at infinity to a close object. It becomes difficult to suppress fluctuations in various aberrations.
  • Each implementation The shape effect can be made more reliable.
  • conditional expression (6) If the corresponding value of conditional expression (6) falls below the lower limit, the refractive power of the first lens group G1 becomes too strong, making it difficult to correct various aberrations including spherical aberration when in focus at infinity. Become.
  • the lower limit of conditional expression (6) By setting the lower limit of conditional expression (6) to 0.60, 0.65, 0.68, 0.70, 0.73, and further to 0.75, the effect of each embodiment can be made more reliable. can be
  • the optical system OL according to the first to fourth embodiments preferably satisfies the following conditional expression (7). 0.10 ⁇ f1/f ⁇ 1.25 (7) where f1: focal length of first lens group G1 f: focal length of optical system OL in infinity focused state
  • Conditional expression (7) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the optical system OL in the infinity focused state. Satisfying the conditional expression (7) makes it possible to satisfactorily correct various aberrations including spherical aberration in the infinity focused state without increasing the size of the lens barrel.
  • conditional expression (7) When the corresponding value of conditional expression (7) exceeds the upper limit, the refractive power of the first lens group G1 becomes too weak, resulting in an increase in the size of the lens barrel.
  • the upper limit of conditional expression (7) By setting the upper limit of conditional expression (7) to 1.20, 1.18, 1.15, 1.13, and further to 1.10, the effect of each embodiment can be made more reliable. can.
  • conditional expression (7) falls below the lower limit, the refractive power of the first lens group G1 becomes too strong, making it difficult to correct various aberrations including spherical aberration when in focus at infinity. Become.
  • Each implementation The shape effect can be made more reliable.
  • the optical system OL according to the first to fourth embodiments preferably satisfies the following conditional expression (8). 0.05 ⁇ Bf/f ⁇ 0.65 (8) However, Bf: Back focus of optical system OL in infinity focused state f: Focal length of optical system OL in infinity focused state
  • Conditional expression (8) defines an appropriate relationship between the back focus of the optical system OL in the infinity focused state and the focal length of the optical system OL in the infinity focused state. Satisfying conditional expression (8) makes it possible to satisfactorily correct various aberrations including coma in the infinity focused state.
  • conditional expression (8) If the corresponding value of conditional expression (8) exceeds the upper limit, the back focal length becomes large relative to the focal length of the optical system OL, making it difficult to correct various aberrations including coma when in focus at infinity. become.
  • the upper limit of conditional expression (8) By setting the upper limit of conditional expression (8) to 0.60, 0.55, 0.50, 0.45, 0.40, and further to 0.35, the effect of each embodiment can be more assured. can be
  • conditional expression (8) If the corresponding value of conditional expression (8) is below the lower limit, the back focal length becomes small with respect to the focal length of the optical system OL, making it difficult to correct various aberrations including coma when in focus at infinity. become.
  • the lower limit of conditional expression (8) By setting the lower limit of conditional expression (8) to 0.08, 0.10, and further 0.12, the effect of each embodiment can be made more reliable.
  • the first lens group G1 preferably has at least one positive lens and satisfies the following conditional expression (9). ⁇ P ⁇ 42.00 (9) where ⁇ P: the Abbe number of the positive lens with the smallest Abbe number among the at least one positive lens in the first lens group G1
  • Conditional expression (9) defines an appropriate range for the Abbe number of the positive lens having the smallest Abbe number among at least one positive lens in the first lens group G1.
  • conditional expression (9) If the corresponding value of conditional expression (9) exceeds the upper limit, the Abbe number of the positive lens having the smallest Abbe number among the at least one positive lens in the first lens group G1 becomes too large, resulting in an increase in size of the lens barrel. It becomes difficult to correct chromatic aberration in the infinity in-focus condition without doing so.
  • the upper limit of conditional expression (9) By setting the upper limit of conditional expression (9) to 40.00, 37.00, 35.00, and further 32.00, the effect of each embodiment can be made more reliable.
  • the first focusing lens group GF1 moves toward the image side along the optical axis when focusing from an infinity object to a short distance object. . This makes it possible to suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • the second focusing lens group GF2 moves toward the object side along the optical axis when focusing from an infinity object to a short distance object. . This makes it possible to suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • the optical system OL preferably satisfies the following conditional expression (10). 0.10 ⁇ MF1/MF2 ⁇ 20.00 (10)
  • MF1 Absolute value of the amount of movement of the first focusing lens group GF1 when focusing from an infinity object to a short distance object
  • MF2 Second focus when focusing from an infinity object to a short distance object Absolute value of movement amount of focal lens group GF2
  • Conditional expression (10) defines the absolute value of the amount of movement of the first focusing lens group GF1 when focusing from an infinity object to a short distance object, and the absolute value of the amount of movement of the first focusing lens group GF1 when focusing from an infinity object to a short distance object. It defines an appropriate relationship with the absolute value of the amount of movement of the second focusing lens group GF2. Satisfying conditional expression (10) makes it possible to suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • conditional expression (10) exceeds the upper limit, the amount of movement of the first focusing lens group GF1 when focusing from an infinity object to a close object becomes too large. It becomes difficult to suppress variations in various aberrations including spherical aberration when focusing on a distant object.
  • conditional expression (10) When the corresponding value of conditional expression (10) is below the lower limit, the amount of movement of the second focusing lens group GF2 when focusing from an infinity object to a close object becomes too large. It becomes difficult to suppress variations in various aberrations including spherical aberration when focusing on a distant object.
  • the lower limit of conditional expression (10) By setting the lower limit of conditional expression (10) to 0.25, 0.40, 0.50, 0.60, 0.70, 0.80, and further to 0.90, the effect of each embodiment is can be made more secure.
  • the optical system OL preferably satisfies the following conditional expression (11). 0.50 ⁇ F1 ⁇ 15.00 (11) where ⁇ F1: Lateral magnification of the first focusing lens group GF1 when in focus at infinity
  • Conditional expression (11) defines an appropriate range for the lateral magnification of the first focusing lens group GF1 in the infinity focused state. Satisfying conditional expression (11) makes it possible to suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • conditional expression (11) exceeds the upper limit, the lateral magnification of the first focusing lens group GF1 in the infinity focused state becomes too large. It becomes difficult to suppress fluctuations in various aberrations, including spherical aberration.
  • the upper limit of conditional expression (11) By setting the upper limit of conditional expression (11) to 14.50, 14.00, 13.50, 13.00, 12.50, 12.00, and further to 11.50, the effect of each embodiment is can be made more secure.
  • conditional expression (11) If the corresponding value of conditional expression (11) is below the lower limit, the lateral magnification of the first focusing lens group GF1 in the infinity focused state becomes too small. It becomes difficult to suppress fluctuations in various aberrations, including spherical aberration. Each implementation The shape effect can be made more reliable.
  • the optical system OL preferably satisfies the following conditional expression (12). 0.05 ⁇ F2 ⁇ 1.00 (12) where ⁇ F2: Lateral magnification of the second focusing lens group GF2 when in focus at infinity
  • Conditional expression (12) defines an appropriate range for the lateral magnification of the second focusing lens group GF2 in the infinity focused state. Satisfying conditional expression (12) makes it possible to suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • conditional expression (12) If the corresponding value of conditional expression (12) exceeds the upper limit, the lateral magnification of the second focusing lens group GF2 in the infinity focused state becomes too large. It becomes difficult to suppress fluctuations in various aberrations, including spherical aberration.
  • conditional expression (12) If the corresponding value of conditional expression (12) is below the lower limit, the lateral magnification of the second focusing lens group GF2 in the infinity focused state becomes too small. It becomes difficult to suppress fluctuations in various aberrations, including spherical aberration.
  • the lower limit of conditional expression (12) By setting the lower limit of conditional expression (12) to 0.06, 0.07, 0.08, 0.09, and further to 0.10, the effect of each embodiment can be made more reliable. can.
  • the optical system OL preferably satisfies the following conditional expression (13). 1.00 ⁇ F1/ ⁇ F2 (13) where ⁇ F1: lateral magnification of the first focusing lens group GF1 in the infinity focused state ⁇ F2: lateral magnification of the second focusing lens group GF2 in the infinity focused state
  • Conditional expression (13) prescribes an appropriate relationship between the lateral magnification of the first focusing lens group GF1 when focused on infinity and the lateral magnification of the second focusing lens group GF2 when focused on infinity. is.
  • conditional expression (13) it is possible to suppress variations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • conditional expression (13) If the corresponding value of conditional expression (13) is below the lower limit, the lateral magnification of the second focusing lens group GF2 in the infinity focused state becomes too large. It becomes difficult to suppress fluctuations in various aberrations, including spherical aberration.
  • conditional expression (13) By setting the upper limit of conditional expression (13) to 110.00, 100.00, 80.00, 65.00, 50.00, and further to 40.00, the effect of each embodiment can be obtained more reliably. can be
  • the optical system OL preferably satisfies the following conditional expression (14). ⁇ F1+(1/ ⁇ F1) ⁇ ⁇ 2 ⁇ 0.250 (14) where ⁇ F1: Lateral magnification of the first focusing lens group GF1 when in focus at infinity
  • Conditional expression (14) defines an appropriate range for the lateral magnification of the first focusing lens group GF1 in the infinity focused state. Satisfying conditional expression (14) makes it possible to suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • conditional expression (14) When the corresponding value of conditional expression (14) exceeds the upper limit, it becomes difficult to suppress variations in various aberrations including spherical aberration when focusing from an object at infinity to a close object.
  • the upper limit of conditional expression (14) By setting the upper limit of conditional expression (14) to 0.230, 0.200, 0.185, 0.170, 0.150, 0.125, and further to 0.100, the effect of each embodiment is can be made more secure.
  • the lower limit of conditional expression (14) By setting the lower limit of conditional expression (14) to 0.000, 0.001, 0.003, and further 0.005, the effect of each embodiment can be made more reliable.
  • the optical system OL preferably satisfies the following conditional expression (15). ⁇ F2+(1/ ⁇ F2) ⁇ ⁇ 2 ⁇ 0.250 (15) where ⁇ F2: Lateral magnification of the second focusing lens group GF2 when in focus at infinity
  • Conditional expression (15) defines an appropriate range for the lateral magnification of the second focusing lens group GF2 in the infinity focused state. Satisfying conditional expression (15) makes it possible to suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • conditional expression (15) When the corresponding value of conditional expression (15) exceeds the upper limit, it becomes difficult to suppress variations in various aberrations including spherical aberration when focusing from an object at infinity to an object at close range.
  • the upper limit of conditional expression (15) By setting the upper limit of conditional expression (15) to 0.230, 0.200, 0.185, 0.170, 0.150, 0.125, and further to 0.100, the effect of each embodiment is can be made more secure.
  • the lower limit of conditional expression (15) By setting the lower limit of conditional expression (15) to 0.000, 0.001, 0.003, 0.005, 0.008, and further to 0.010, the effect of each embodiment can be obtained more reliably. can be
  • a method for manufacturing the optical system OL according to the first embodiment will be outlined with reference to FIG.
  • a first lens group G1, a first focusing lens group GF1 having negative refractive power, and a second focusing lens group GF2 having positive refractive power are arranged in order from the object side along the optical axis.
  • the first focusing lens group GF1 and the second focusing lens group GF2 are configured to move along the optical axis in different trajectories (step ST2).
  • an aperture diaphragm S is arranged on the object side of the first focusing lens group GF1 (step ST3).
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expression (1) (step ST4). According to such a manufacturing method, it is possible to manufacture an optical system with less aberration fluctuation during focusing.
  • a method for manufacturing the optical system OL according to the second embodiment will be outlined with reference to FIG.
  • a first lens group G1, a first focusing lens group GF1 having negative refractive power, a second focusing lens group GF2 having positive refractive power, a negative step ST11
  • the first focusing lens group GF1 and the second focusing lens group GF2 are configured to move along the optical axis in different trajectories (step ST12).
  • the aperture stop S is arranged on the object side of the first focusing lens group GF1 (step ST13).
  • each lens is arranged in the lens barrel so as to satisfy at least conditional expression (2) (step ST14). According to such a manufacturing method, it is possible to manufacture an optical system with less aberration fluctuation during focusing.
  • a method for manufacturing the optical system OL according to the third embodiment will be outlined with reference to FIG.
  • a first lens group G1, a first focusing lens group GF1 having negative refractive power, and a second focusing lens group GF2 having positive refractive power are arranged in order from the object side along the optical axis.
  • the first focusing lens group GF1 and the second focusing lens group GF2 are configured to move along the optical axis in different trajectories (step ST22).
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expression (3) (step ST23). According to such a manufacturing method, it is possible to manufacture an optical system with less aberration fluctuation during focusing.
  • the first lens group G1, the aperture diaphragm S, the first focusing lens group GF1, and the second focusing lens group GF2 are arranged in order from the object side along the optical axis (step ST31).
  • the first focusing lens group GF1 and the second focusing lens group GF2 are configured to move along the optical axis in different trajectories (step ST32).
  • each lens is arranged in the lens barrel so that the first focusing lens group GF1 has at least two negative lenses (step ST33). According to such a manufacturing method, it is possible to manufacture an optical system with less aberration fluctuation during focusing.
  • optical system OL according to the example of each embodiment will be described below with reference to the drawings.
  • 1, 3, and 5 are cross-sectional views showing configurations and refractive power distributions of optical systems OL ⁇ OL(1) to OL(3) ⁇ according to first to third examples.
  • arrows indicate the moving directions of the lens groups along the optical axis when focusing from infinity to a short distance object. showing.
  • each lens group is represented by a combination of symbol G and a number, and each lens is represented by a combination of symbol L and a number.
  • the lens groups and the like are represented independently using combinations of symbols and numerals for each embodiment. Therefore, even if the same reference numerals and symbols are used between the embodiments, it does not mean that they have the same configuration.
  • f is the focal length of the entire lens system
  • FNO is the F number
  • 2 ⁇ is the angle of view (unit is ° (degrees)
  • ⁇ is the half angle of view
  • Ymax is the maximum image height.
  • TL indicates the distance obtained by adding Bf to the distance from the frontmost lens surface to the final lens surface on the optical axis when focusing on infinity
  • Bf is the distance from the final lens surface on the optical axis when focusing on infinity.
  • the distance to plane I (back focus) is shown.
  • ⁇ F1 indicates the lateral magnification of the first focusing lens group in the infinity focused state.
  • ⁇ F2 indicates the lateral magnification of the second focusing lens group when in focus at infinity.
  • MF1 represents the absolute value of the amount of movement of the first focusing lens group when focusing from an infinity object to a short distance object.
  • MF2 represents the absolute value of the amount of movement of the second focusing lens group when focusing from an infinity object to a short distance object.
  • Lfr indicates the distance on the optical axis from the most object-side lens surface of the optical system to the aperture stop.
  • Lre indicates the distance on the optical axis from the aperture stop to the image plane.
  • f1R represents the combined focal length of the lens group arranged closer to the image side than the first lens group when in focus at infinity.
  • the surface number indicates the order of the optical surfaces from the object side along the direction in which light rays travel
  • R is the radius of curvature of each optical surface (the surface whose center of curvature is located on the image side). is a positive value)
  • D is the distance on the optical axis from each optical surface to the next optical surface (or image plane)
  • nd is the refractive index for the d-line of the material of the optical member
  • ⁇ d is the optical
  • the Abbe numbers of the materials of the members are shown with reference to the d-line.
  • the radius of curvature “ ⁇ ” indicates a plane or an aperture
  • (diaphragm S) indicates an aperture diaphragm S, respectively.
  • the [Variable Spacing Data] table shows the surface spacing at surface number i for which the surface spacing is (Di) in the [Lens Specifications] table.
  • the [Variable Spacing Data] table shows the surface spacing in the infinity focused state and the surface spacing in the close distance focused state.
  • f indicates the focal length of the entire lens system
  • ⁇ indicates the photographing magnification.
  • D0 indicates the distance from the object to the optical surface closest to the object in the optical system.
  • the [Lens group data] table shows the starting surface (surface closest to the object side) and focal length of each lens group.
  • mm is generally used for the focal length f, radius of curvature R, surface spacing D, and other lengths in all specifications below, but the optical system is proportionally enlarged. Alternatively, it is not limited to this because equivalent optical performance can be obtained even if it is proportionally reduced.
  • FIG. 1 is a diagram showing the lens configuration of the optical system according to the first embodiment.
  • the optical system OL(1) according to the first example includes a first lens group G1 having positive refractive power and a second lens group G2 having negative refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, and a fourth lens group G4 having negative refractive power.
  • the second lens group G2 moves along the optical axis toward the image side
  • the third lens group G3 moves along the optical axis toward the object side, The distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I during focusing.
  • the sign (+) or (-) attached to each lens group symbol indicates the refractive power of each lens group, and this is the same for all the following examples.
  • the aperture stop S is arranged between the first lens group G1 and the second lens group G2.
  • the aperture stop S is fixed in position with respect to the image plane I during focusing.
  • the second lens group G2 corresponds to the first focusing lens group GF1
  • the third lens group G3 corresponds to the second focusing lens group GF2
  • the fourth lens group G4 corresponds to the subsequent lens group GR. Applicable.
  • the first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a positive meniscus lens L12 having a convex surface facing the object side, and a convex surface facing the object side, arranged in order from the object side along the optical axis.
  • a negative meniscus lens L13, a biconvex positive lens L14, a biconvex positive lens L15, and a cemented negative lens in which a biconcave negative lens L16 and a biconvex positive lens L17 are cemented together. consists of
  • the second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, a biconcave negative lens L22, and a biconvex positive lens L23, which are arranged in order from the object side along the optical axis. consists of
  • the third lens group G3 is composed of a biconvex positive lens L31 and a biconvex positive lens L32 arranged in order from the object side along the optical axis.
  • the positive lens L32 has an aspheric lens surface on the object side.
  • the fourth lens group G4 is composed of a biconcave negative lens L41 and a positive meniscus lens L42 having a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • An image plane I is arranged on the image side of the fourth lens group G4.
  • Table 1 below lists the values of the specifications of the optical system according to the first example.
  • FIG. 2(A) is a diagram showing various aberrations of the optical system according to the first embodiment when focusing at infinity.
  • FIG. 2B is a diagram of various aberrations of the optical system according to the first embodiment when focusing at a short distance.
  • FNO indicates the F number
  • Y indicates the image height.
  • NA indicates the numerical aperture
  • Y indicates the image height.
  • the spherical aberration diagram shows the F-number or numerical aperture corresponding to the maximum aperture
  • the astigmatism diagram and the distortion diagram show the maximum image height
  • the coma aberration diagram shows the value of each image height. .
  • a solid line indicates a sagittal image plane, and a broken line indicates a meridional image plane.
  • aberration diagrams of each example shown below the same reference numerals as in the present example are used, and redundant description is omitted.
  • the optical system of Example 1 has excellent imaging performance, with various aberrations well corrected not only when focusing at infinity but also when focusing at close distances. I understand.
  • FIG. 3 is a diagram showing the lens configuration of the optical system according to the second embodiment.
  • the optical system OL(2) according to the second embodiment includes a first lens group G1 having positive refractive power and a second lens group G2 having negative refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, and a fourth lens group G4 having negative refractive power.
  • the second lens group G2 moves along the optical axis toward the image side
  • the third lens group G3 moves along the optical axis toward the object side
  • the distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I during focusing.
  • the aperture stop S is arranged between the first lens group G1 and the second lens group G2.
  • the aperture stop S is fixed in position with respect to the image plane I during focusing.
  • the second lens group G2 corresponds to the first focusing lens group GF1
  • the third lens group G3 corresponds to the second focusing lens group GF2
  • the fourth lens group G4 corresponds to the subsequent lens group GR. Applicable.
  • the first lens group G1 is composed of a double convex positive lens L11, a double concave negative lens L12, and a double convex positive lens L13, which are arranged in order from the object side along the optical axis. and a cemented positive lens in which a positive meniscus lens L14 having a concave surface facing the object side, a biconcave negative lens L15, and a biconvex positive lens L16 are cemented together.
  • the positive meniscus lens L14 has an aspheric lens surface on the object side.
  • the second lens group G2 includes a negative meniscus lens L21 with a convex surface facing the object side, a biconcave negative lens L22, and a positive meniscus lens with a convex surface facing the object side, arranged in order from the object side along the optical axis. and a lens L23.
  • the third lens group G3 is composed of a cemented positive lens in which a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32 are cemented in order from the object side along the optical axis.
  • the negative meniscus lens L31 has an aspheric lens surface on the object side.
  • the fourth lens group G4 includes a negative meniscus lens L41 with a convex surface facing the object side, a negative meniscus lens L42 with a convex surface facing the object side, and a negative meniscus lens L42 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • An image plane I is arranged on the image side of the fourth lens group G4.
  • Table 2 below lists the values of the specifications of the optical system according to the second example.
  • FIG. 4(A) is a diagram showing various aberrations of the optical system according to the second embodiment when focusing on infinity.
  • FIG. 4B is a diagram of various aberrations of the optical system according to the second embodiment during short-distance focusing. From the various aberration diagrams, the optical system of Example 2 has excellent imaging performance, with various aberrations well corrected not only when focusing at infinity but also when focusing at close distances. I understand.
  • FIG. 5 is a diagram showing the lens configuration of the optical system according to the third embodiment.
  • the optical system OL(3) according to the third embodiment includes a first lens group G1 having positive refractive power and a second lens group G2 having negative refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, and a fourth lens group G4 having negative refractive power.
  • the second lens group G2 moves along the optical axis toward the image side
  • the third lens group G3 moves along the optical axis toward the object side
  • the distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I during focusing.
  • the aperture stop S is arranged between the first lens group G1 and the second lens group G2.
  • the aperture stop S is fixed in position with respect to the image plane I during focusing.
  • the second lens group G2 corresponds to the first focusing lens group GF1
  • the third lens group G3 corresponds to the second focusing lens group GF2
  • the fourth lens group G4 corresponds to the subsequent lens group GR. Applicable.
  • the first lens group G1 includes a positive meniscus lens L11 having a convex surface facing the object side, a positive meniscus lens L12 having a convex surface facing the object side, and a convex surface facing the object side, arranged in order from the object side along the optical axis.
  • a cemented negative lens in which a positive meniscus lens L13 facing the object side and a negative meniscus lens L14 having a convex surface facing the object side are cemented; a biconcave negative lens L15; a biconvex positive lens L16; and a plano-convex positive lens L17 directed toward.
  • the second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, a biconcave negative lens L22, and a biconvex positive lens L23, which are arranged in order from the object side along the optical axis. consists of
  • the third lens group G3 includes a biconvex positive lens L31, a positive meniscus lens L32 with a concave surface facing the object side, and a negative meniscus lens with a concave surface facing the object side, arranged in order from the object side along the optical axis. and a cemented positive lens to which L33 is cemented.
  • the fourth lens group G4 includes a cemented positive lens in which a biconcave negative lens L41 and a biconvex positive lens L42 are cemented, and a biconcave negative lens, which are arranged in order from the object side along the optical axis. It is composed of a cemented negative lens L43 and a biconvex positive lens L44 cemented together, and a negative meniscus lens L45 having a concave surface facing the object side.
  • An image plane I is arranged on the image side of the fourth lens group G4.
  • Table 3 lists the values of the specifications of the optical system according to the third example.
  • FIG. 6(A) is a diagram showing various aberrations of the optical system according to the third embodiment when focusing on infinity.
  • FIG. 6B is a diagram of various aberrations of the optical system according to the third embodiment during short-distance focusing. From the various aberration diagrams, the optical system of Example 3 has excellent imaging performance, with various aberrations well corrected not only when focusing at infinity but also when focusing at close distances. I understand.
  • Conditional expression (1) 0.68 ⁇ (-fF1)/fF2 ⁇ 3.60
  • Conditional expression (2) 0.60 ⁇ fF2/(-fR) ⁇ 1.10
  • Conditional expression (3) f1/
  • Conditional expression (4) 0.50 ⁇ Lre/Lfr ⁇ 4.00
  • Conditional expression (5) 0.45 ⁇ f1/(-fF1) ⁇ 2.50
  • Conditional expression (6) 0.55 ⁇ f1/fF2 ⁇ 3.00
  • Conditional expression (7) 0.10 ⁇ f1/f ⁇ 1.25
  • Conditional expression (8) 0.05 ⁇ Bf/f ⁇ 0.65 Conditional expression (9) ⁇ P ⁇ 42.00
  • Conditional expression (10) 0.10 ⁇ MF1/MF2 ⁇ 20.00
  • Conditional expression (11) 0.50 ⁇ F1 ⁇ 15.00
  • Conditional expression (12) 0.05 ⁇ F2 ⁇ 1.00
  • Conditional expression (13) 1.00 ⁇ F1/ ⁇ F2
  • Conditional expression (14) ⁇ F1+(1/1/ ⁇ F1+(1/
  • the following content can be appropriately adopted within a range that does not impair the optical performance of the optical system of this embodiment.
  • a four-group configuration is shown, but the present application is not limited to this, and an optical system with other group configurations (for example, five groups, six groups, etc.) can be configured.
  • a lens or a lens group may be added to the most object side or most image plane side of the optical system of this embodiment.
  • the lens group refers to a portion having at least one lens separated by an air gap that changes during focusing.
  • Image blurring caused by camera shake is corrected by moving the lens group or partial lens group so that it has a component in the direction perpendicular to the optical axis, or rotating (oscillating) in the plane including the optical axis. It may be used as an anti-vibration lens group.
  • the lens surface may be spherical, flat, or aspherical.
  • a spherical or flat lens surface is preferable because it facilitates lens processing and assembly adjustment and prevents degradation of optical performance due to errors in processing and assembly adjustment. Also, even if the image plane is deviated, there is little deterioration in rendering performance, which is preferable.
  • the aspherical surface can be ground aspherical, glass-molded aspherical, which is formed into an aspherical shape from glass, or composite aspherical, which is formed into an aspherical shape from resin on the surface of glass. It doesn't matter which one.
  • the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
  • GRIN lens gradient index lens
  • the aperture stop is preferably arranged between the first lens group and the second lens group, but the role may be substituted by a lens frame without providing a member as the aperture stop.
  • Each lens surface may be coated with an antireflection film that has high transmittance over a wide wavelength range in order to reduce flare and ghost and achieve high-contrast optical performance.

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