WO2022219918A1 - 変倍光学系、光学機器、および変倍光学系の製造方法 - Google Patents

変倍光学系、光学機器、および変倍光学系の製造方法 Download PDF

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Publication number
WO2022219918A1
WO2022219918A1 PCT/JP2022/006338 JP2022006338W WO2022219918A1 WO 2022219918 A1 WO2022219918 A1 WO 2022219918A1 JP 2022006338 W JP2022006338 W JP 2022006338W WO 2022219918 A1 WO2022219918 A1 WO 2022219918A1
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Prior art keywords
optical system
lens
group
lens group
variable
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PCT/JP2022/006338
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English (en)
French (fr)
Japanese (ja)
Inventor
知之 幸島
貴博 石川
史哲 大竹
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Nikon Corp
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Nikon Corp
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Priority to JP2023514360A priority Critical patent/JP7464191B2/ja
Priority to CN202280024900.2A priority patent/CN117063108A/zh
Priority to US18/276,028 priority patent/US20240118525A1/en
Publication of WO2022219918A1 publication Critical patent/WO2022219918A1/ja
Anticipated expiration legal-status Critical
Priority to JP2024042939A priority patent/JP7726316B2/ja
Priority to JP2025127401A priority patent/JP2025142330A/ja
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1445—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative
    • G02B15/144515—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative arranged -+++
    • 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
    • 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
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
    • G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length

Definitions

  • the present invention relates to a variable-magnification optical system, an optical device, and a method for manufacturing a variable-magnification optical system.
  • variable power optical systems suitable for photographic cameras, electronic still cameras, video cameras, etc.
  • Patent Document 1 variable-magnification optical system
  • a variable magnification optical system comprises a first lens group having a negative refractive power and a rear group having at least one lens group arranged in order from the object side along an optical axis, During zooming, the distance between adjacent lens groups changes, satisfying the following conditional expression. 0.90 ⁇ TLt/ft ⁇ 1.50 where TLt is the total length of the variable magnification optical system in the telephoto end state, and ft is the focal length of the variable magnification optical system in the telephoto end state.
  • a variable magnification optical system comprises a first lens group having a negative refractive power and a rear group having at least one lens group arranged in order from the object side along an optical axis, During zooming, the distance between adjacent lens groups changes, satisfying the following conditional expression. 1.50 ⁇ TLw/fw ⁇ 2.30 where TLw: the total length of the variable power optical system in the wide-angle end state fw: the focal length of the variable power optical system in the wide-angle end state
  • a variable power optical system comprises a first lens group having negative refractive power and a rear group having at least one lens group, arranged in order from the object side along the optical axis, During zooming, the distance between adjacent lens groups changes, satisfying the following conditional expression. 0.50 ⁇ (-f1)/TLw ⁇ 1.50 where f1 is the focal length of the first lens group, and TLw is the total length of the variable magnification optical system in the wide-angle end state.
  • a variable power optical system comprises a first lens group having negative refractive power and a rear group having at least one lens group, arranged in order from the object side along the optical axis, During zooming, the distance between adjacent lens groups changes, satisfying the following conditional expression. 0.35 ⁇ (-f1)/TLt ⁇ 1.25 where f1 is the focal length of the first lens group, and TLt is the total length of the variable magnification optical system in the telephoto end state.
  • An optical apparatus is configured to include the variable power optical system.
  • a method for manufacturing a variable magnification optical system includes a first lens group having negative refractive power and a rear group having at least one lens group, which are arranged in order from the object side along an optical axis.
  • each lens is arranged in a lens barrel so that the distance between adjacent lens groups changes during variable power and satisfies the following conditional expression: . 0.90 ⁇ TLt/ft ⁇ 1.50 where TLt is the total length of the variable magnification optical system in the telephoto end state, and ft is the focal length of the variable magnification optical system in the telephoto end state.
  • a method of manufacturing a variable magnification optical system comprises a first lens group having negative refractive power and a rear group having at least one lens group, which are arranged in order from the object side along the optical axis.
  • each lens is arranged in a lens barrel so that the distance between adjacent lens groups changes during variable power and satisfies the following conditional expression: . 1.50 ⁇ TLw/fw ⁇ 2.30 where TLw: the total length of the variable power optical system in the wide-angle end state fw: the focal length of the variable power optical system in the wide-angle end state
  • a method for manufacturing a variable magnification optical system includes a first lens group having negative refractive power and a rear group having at least one lens group, which are arranged in order from the object side along the optical axis.
  • each lens is arranged in a lens barrel so that the distance between adjacent lens groups changes during variable power and satisfies the following conditional expression: . 0.50 ⁇ (-f1)/TLw ⁇ 1.50 where f1 is the focal length of the first lens group, and TLw is the total length of the variable magnification optical system in the wide-angle end state.
  • a method for manufacturing a variable magnification optical system includes a first lens group having negative refractive power and a rear group having at least one lens group, which are arranged in order from the object side along the optical axis.
  • each lens is arranged in a lens barrel so that the distance between adjacent lens groups changes during variable power and satisfies the following conditional expression: . 0.35 ⁇ (-f1)/TLt ⁇ 1.25 where f1 is the focal length of the first lens group, and TLt is the total length of the variable magnification optical system in the telephoto end state.
  • FIG. 1 is a diagram showing a lens configuration of a variable power optical system according to a first example
  • FIG. FIGS. 2A and 2B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the first embodiment, respectively, when focusing on infinity.
  • FIG. 10 is a diagram showing a lens configuration of a variable-magnification optical system according to a second example
  • 4A and 4B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the second embodiment, respectively, when focusing on infinity.
  • FIG. 11 is a diagram showing a lens configuration of a variable-magnification optical system according to a third example; 6A and 6B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the third embodiment, respectively, when focusing on infinity.
  • FIG. 11 is a diagram showing a lens configuration of a variable-magnification optical system according to a fourth example; 8A and 8B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the fourth embodiment, respectively, when focusing on infinity.
  • FIG. 11 is a diagram showing a lens configuration of a variable-magnification optical system according to a third example; 6A and 6B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the third embodiment, respectively, when focusing on infinity.
  • FIG. 11 is a diagram showing a lens configuration of a variable-
  • FIG. 11 is a diagram showing a lens configuration of a variable-magnification optical system according to a fifth example; 10A and 10B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the fifth embodiment, respectively, when focusing on infinity.
  • FIG. 11 is a diagram showing a lens configuration of a variable-magnification optical system according to a sixth example; 12A and 12B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the sixth embodiment, respectively, when focusing on infinity.
  • FIG. 11 is a diagram showing a lens configuration of a variable-magnification optical system according to a seventh example; FIGS.
  • FIG. 14A and 14B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the seventh embodiment, respectively, when focusing on infinity.
  • FIG. 21 is a diagram showing a lens configuration of a variable-magnification optical system according to an eighth embodiment
  • FIGS. 16A and 16B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the eighth embodiment when focusing on infinity.
  • FIG. 21 is a diagram showing a lens configuration of a variable-magnification optical system according to a ninth embodiment; FIGS.
  • FIGS. 18A and 18B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the ninth embodiment, respectively, when focusing on infinity.
  • FIG. 20 is a diagram showing a lens configuration of a variable-magnification optical system according to a tenth example; 20A and 20B are diagrams of various aberrations in the wide-angle end state and the telephoto end state of the variable power optical system according to the tenth embodiment, respectively, when focusing on infinity.
  • FIG. 21 is a diagram showing a lens configuration of a variable-magnification optical system according to an eleventh embodiment; FIGS.
  • 22A and 22B are diagrams of various aberrations in the wide-angle end state and telephoto end state of the variable power optical system according to the eleventh embodiment, respectively, when focusing on infinity. It is a figure which shows the structure of the camera provided with the variable-magnification optical system which concerns on each embodiment. 4 is a flow chart showing a method of manufacturing a variable power optical system according to each 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 a variable magnification optical system ZL 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.
  • variable magnification optical system ZL of the photographing lens 3 The light from the subject is condensed by the variable magnification optical system ZL 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 variable power optical system ZL shown in FIG. 23 schematically shows the variable power optical system provided in the taking lens 3, and the lens configuration of the variable power optical system ZL is not limited to this configuration. do not have.
  • variable power optical system ZL(1) as an example of the variable power optical system (zoom lens) ZL according to the first embodiment includes, as shown in FIG. It is composed of a first lens group G1 having refractive power and a rear group GR having at least one lens group. During zooming, the distance between adjacent lens groups changes.
  • variable power optical system ZL satisfies the following conditional expression (1). 0.90 ⁇ TLt/ft ⁇ 1.50 (1) where TLt is the total length of the variable magnification optical system ZL in the telephoto end state ft is the focal length of the variable magnification optical system ZL in the telephoto end state
  • variable-magnification optical system ZL may be the variable-magnification optical system ZL(2) shown in FIG. 3, the variable-magnification optical system ZL(3) shown in FIG. It may be the system ZL(4), the variable power optical system ZL(5) shown in FIG. 9, or the variable power optical system ZL(6) shown in FIG.
  • the variable-magnification optical system ZL according to the first embodiment may be the variable-magnification optical system ZL(7) shown in FIG. 13, the variable-magnification optical system ZL(8) shown in FIG. It may be the magnification optical system ZL(9), the variable magnification optical system ZL(10) shown in FIG. 19, or the variable magnification optical system ZL(11) shown in FIG.
  • Conditional expression (1) defines an appropriate relationship between the total length of the variable power optical system ZL in the telephoto end state and the focal length of the variable power optical system ZL in the telephoto end state.
  • the total length of the variable-magnification optical system ZL is the distance on the optical axis from the most object-side lens surface of the variable-magnification optical system ZL to the image plane I when focusing on infinity (however, the variable magnification
  • the distance on the optical axis from the lens surface closest to the image side of the optical system ZL to the image plane I is the air conversion distance).
  • conditional expression (1) If the value corresponding to conditional expression (1) is out of the above range, it becomes difficult to correct various aberrations while miniaturizing the variable power optical system ZL.
  • the upper limit of conditional expression (1) By setting the upper limit of conditional expression (1) to 1.45, 1.40, 1.35, 1.30, 1.25, 1.20, and further to 1.17, the effect of this embodiment is can be made more secure. Further, by setting the lower limit of conditional expression (1) to 0.95, 1.00, 1.03, 1.05, 1.08, and further to 1.10, the effect of the present embodiment can be obtained more reliably. can be
  • variable magnification optical system ZL(1) as an example of a variable power optical system (zoom lens) ZL according to the second embodiment includes, as shown in FIG. It is composed of a first lens group G1 having refractive power and a rear group GR having at least one lens group. During zooming, the distance between adjacent lens groups changes.
  • variable power optical system ZL satisfies the following conditional expression (2). 1.50 ⁇ TLw/fw ⁇ 2.30 (2) where TLw: the total length of the variable power optical system ZL in the wide-angle end state fw: the focal length of the variable power optical system ZL in the wide-angle end state
  • variable power optical system ZL may be the variable power optical system ZL(2) shown in FIG. 3, the variable power optical system ZL(3) shown in FIG. 5, or the variable power optical system ZL(3) shown in FIG. It may be the system ZL(4), the variable power optical system ZL(5) shown in FIG. 9, or the variable power optical system ZL(6) shown in FIG.
  • the variable-magnification optical system ZL according to the second embodiment may be the variable-magnification optical system ZL(7) shown in FIG. 13, the variable-magnification optical system ZL(8) shown in FIG. It may be the magnification optical system ZL(9), the variable magnification optical system ZL(10) shown in FIG. 19, or the variable magnification optical system ZL(11) shown in FIG.
  • Conditional expression (2) defines an appropriate relationship between the total length of the variable power optical system ZL in the wide-angle end state and the focal length of the variable power optical system ZL in the wide-angle end state.
  • conditional expression (2) If the corresponding value of conditional expression (2) is out of the above range, it becomes difficult to correct various aberrations while miniaturizing the variable power optical system ZL.
  • the upper limit of conditional expression (2) By setting the upper limit of conditional expression (2) to 2.25, 2.20, 2.15, 2.10, 2.05, 2.00, and further to 1.95, the effect of this embodiment is can be made more secure. Further, by setting the lower limit of conditional expression (2) to 1.55, 1.60, 1.65, 1.70, 1.75, and further to 1.80, the effect of the present embodiment can be obtained more reliably. can be
  • variable power optical system ZL(1) as an example of a variable power optical system (zoom lens) ZL according to the third embodiment includes, as shown in FIG. It is composed of a first lens group G1 having refractive power and a rear group GR having at least one lens group. During zooming, the distance between adjacent lens groups changes.
  • variable power optical system ZL satisfies the following conditional expression (3). 0.50 ⁇ (-f1)/TLw ⁇ 1.50 (3) where f1 is the focal length of the first lens group G1, and TLw is the total length of the variable magnification optical system ZL in the wide-angle end state.
  • variable-magnification optical system ZL according to the third embodiment may be the variable-magnification optical system ZL(2) shown in FIG. 3, the variable-magnification optical system ZL(3) shown in FIG. It may be the system ZL(4), the variable power optical system ZL(5) shown in FIG. 9, or the variable power optical system ZL(6) shown in FIG. Further, the variable-magnification optical system ZL according to the third embodiment may be the variable-magnification optical system ZL(7) shown in FIG. 13, the variable-magnification optical system ZL(8) shown in FIG. It may be the magnification optical system ZL(9), the variable magnification optical system ZL(10) shown in FIG. 19, or the variable magnification optical system ZL(11) shown in FIG.
  • Conditional expression (3) defines an appropriate relationship between the focal length of the first lens group G1 and the total length of the variable magnification optical system ZL in the wide-angle end state.
  • conditional expression (3) If the corresponding value of conditional expression (3) is out of the above range, it becomes difficult to correct various aberrations while downsizing the variable magnification optical system ZL.
  • the upper limit of conditional expression (3) By setting the upper limit of conditional expression (3) to 1.40, 1.30, 1.25, 1.20, 1.15, and further to 1.10, the effect of this embodiment can be more assured.
  • the lower limit of conditional expression (3) By setting the lower limit of conditional expression (3) to 0.55, 0.60, 0.65, 0.70, and further to 0.73, the effect of this embodiment is made more reliable. be able to.
  • variable power optical system ZL(1) as an example of a variable power optical system (zoom lens) ZL according to the fourth embodiment, as shown in FIG. It is composed of a first lens group G1 having refractive power and a rear group GR having at least one lens group. During zooming, the distance between adjacent lens groups changes.
  • variable power optical system ZL satisfies the following conditional expression (4). 0.35 ⁇ (-f1)/TLt ⁇ 1.25 (4) where f1 is the focal length of the first lens group G1 TLt is the total length of the variable magnification optical system ZL in the telephoto end state
  • variable-magnification optical system ZL according to the fourth embodiment may be the variable-magnification optical system ZL(2) shown in FIG. 3, the variable-magnification optical system ZL(3) shown in FIG. It may be the system ZL(4), the variable power optical system ZL(5) shown in FIG. 9, or the variable power optical system ZL(6) shown in FIG. Further, the variable-magnification optical system ZL according to the fourth embodiment may be the variable-magnification optical system ZL(7) shown in FIG. 13, the variable-magnification optical system ZL(8) shown in FIG. It may be the magnification optical system ZL(9), the variable magnification optical system ZL(10) shown in FIG. 19, or the variable magnification optical system ZL(11) shown in FIG.
  • Conditional expression (4) defines an appropriate relationship between the focal length of the first lens group G1 and the total length of the variable magnification optical system ZL in the telephoto end state.
  • conditional expression (4) If the corresponding value of conditional expression (4) is out of the above range, it becomes difficult to correct various aberrations while downsizing the variable power optical system ZL.
  • the upper limit of conditional expression (4) By setting the upper limit of conditional expression (4) to 1.20, 1.15, 1.10, 1.08, 1.05, and further to 1.03, the effect of the present embodiment can be more assured.
  • the lower limit of conditional expression (4) By setting the lower limit of conditional expression (4) to 0.40, 0.45, 0.50, 0.55, 0.60, and further to 0.65, the effect of the present embodiment can be obtained more reliably.
  • variable-magnification optical system ZL In the variable-magnification optical system ZL according to the first to fourth embodiments, at least a part of any lens group in at least one lens group of the rear group GR moves along the optical axis during focusing.
  • a focal group GF is desirable. This makes it possible to satisfactorily correct various aberrations while maintaining a small size.
  • the focusing group GF has negative refractive power and satisfies the following conditional expression (5). 1.50 ⁇ ft/(-fF) ⁇ 10.00 (5) where ft is the focal length of the variable power optical system ZL in the telephoto end state fF is the focal length of the focusing group GF
  • Conditional expression (5) defines an appropriate relationship between the focal length of the variable magnification optical system ZL in the telephoto end state and the focal length of the focusing group GF having negative refractive power.
  • conditional expression (5) If the corresponding value of conditional expression (5) is out of the above range, the amount of movement of the focusing group GF becomes large, so that spherical aberration, coma, and field curvature when focusing on a short-distance object. It becomes difficult to control fluctuations.
  • the upper limit of conditional expression (5) is 8.50, 7.00, 6.00, 5.00, 4.75, 4.50, 4.25, 4.00, 3.85, and further 3.70 , the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (5) is set to 1.55, 1.60, 1.65, 1.70, 1.75, 1.80, 1.85, 1.90, and further to 1.95. By doing so, the effect of each embodiment can be made more reliable.
  • variable magnification optical system ZL In the variable magnification optical system ZL according to the first to fourth embodiments, it is desirable that the focusing group GF has negative refractive power and satisfies the following conditional expression (6). 0.70 ⁇ fw/(-fF) ⁇ 7.00 (6) where fw: focal length of variable-magnification optical system ZL in the wide-angle end state fF: focal length of focusing group GF
  • Conditional expression (6) defines an appropriate relationship between the focal length of the variable magnification optical system ZL in the wide-angle end state and the focal length of the focusing group GF having negative refractive power.
  • conditional expression (6) If the corresponding value of conditional expression (6) is out of the above range, the amount of movement of the focusing group GF becomes large, and spherical aberration, coma, and curvature of field when focusing on a short-distance object are affected. It becomes difficult to control fluctuations.
  • the upper limit of conditional expression (6) is 6.50, 6.00, 5.50, 5.00, 4.50, 4.00, 3.50, 3.00, 2.75, 2.50, By setting it to 2.35, and further to 2.25, the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (6) is set to 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, and further to 1.15. By doing so, the effect of each embodiment can be made more reliable.
  • the focusing group GF has negative refractive power and satisfies the following conditional expression (7). 1.00 ⁇ fFRw/(-fF) ⁇ 7.00 (7)
  • fFRw the focal length of the lens group composed of lenses arranged closer to the image side than the focusing group GF in the wide-angle end state
  • fF the focal length of the focusing group GF
  • Conditional expression (7) is the focal length of the lens group composed of lenses arranged closer to the image side than the focusing group GF in the wide-angle end state and the focal length of the focusing group GF having negative refractive power. It defines appropriate relationships.
  • a lens group composed of lenses arranged closer to the image side than the focusing group GF may be referred to as an image-side lens group GFR.
  • conditional expression (7) If the corresponding value of conditional expression (7) exceeds the upper limit, the focal length of the focusing group GF becomes too short with respect to the focal length of the image-side lens group GFR. It becomes difficult to suppress variations in coma and curvature of field.
  • the upper limit of conditional expression (7) is 6.50, 6.00, 5.50, 5.00, 4.50, 4.00, 3.50, 3.25, 3.00, 2.75, Furthermore, by setting it to 2.50, the effect of each embodiment can be made more reliable.
  • conditional expression (7) When the corresponding value of conditional expression (7) is below the lower limit, the amount of movement of the focusing group GF becomes large, so that fluctuations in spherical aberration, coma, and curvature of field when focusing on a short-distance object are suppressed. difficult to suppress.
  • the lower limit of conditional expression (7) is 1.10, 1.20, 1.30, 1.40, 1.50, 1.55, 1.60, 1.65, 1.70, 1.75, Furthermore, by setting it to 1.80, the effect of each embodiment can be made more reliable.
  • the focusing group GF has negative refractive power and satisfies the following conditional expression (8). 1.00 ⁇ fFRt/(-fF) ⁇ 7.00 (8) where fFRt is the focal length of the lens group composed of lenses arranged closer to the image side than the focusing group GF in the telephoto end state fF: the focal length of the focusing group GF
  • Conditional expression (8) defines the focal length of the lens group (image-side lens group GFR) composed of lenses arranged closer to the image side than the focusing group GF in the telephoto end state, and the focal length of the lens group GFR having a negative refractive power. It defines an appropriate relationship with the focal length of the group GF.
  • conditional expression (8) exceeds the upper limit, the focal length of the focusing group GF becomes too short with respect to the focal length of the image-side lens group GFR. It becomes difficult to suppress variations in coma and curvature of field.
  • the upper limit of conditional expression (8) is 6.50, 6.00, 5.50, 5.00, 4.50, 4.00, 3.50, 3.25, 3.00, 2.75, Furthermore, by setting it to 2.50, the effect of each embodiment can be made more reliable.
  • conditional expression (8) When the corresponding value of conditional expression (8) is below the lower limit, the amount of movement of the focusing group GF becomes large, so that fluctuations in spherical aberration, coma, and curvature of field when focusing on a short-distance object are suppressed. difficult to suppress.
  • the lower limit of conditional expression (8) is 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.65, 1.70, 1.75, 1.80, By setting it to 1.85, 1.90, and further 1.95, the effect of each embodiment can be made more reliable.
  • the focusing group GF has negative refractive power and satisfies the following conditional expression (9). 0.50 ⁇ fRPF/(-fF) ⁇ 3.00 (9)
  • fRPF the focal length of the lens group closest to the object side among the lens groups having positive refractive power in at least one lens group of the rear group
  • GR fF the focal length of the focusing group GF
  • Conditional expression (9) defines the focal length of the lens group closest to the object side among the lens groups having positive refractive power in at least one lens group of the rear group GR, and the focal length of the focusing group GF having negative refractive power. It defines an appropriate relationship with the focal length.
  • conditional expression (9) When the corresponding value of conditional expression (9) exceeds the upper limit, the focal length of the focusing group GF becomes short, so that fluctuations in spherical aberration, coma, and curvature of field when focusing on a short-distance object are reduced. difficult to suppress.
  • the upper limit of conditional expression (9) is 2.75, 2.50, 2.25, 2.00, 1.85, 1.70, 1.60, 1.55, 1.50, and further 1.48 , the effect of each embodiment can be made more reliable.
  • conditional expression (9) When the corresponding value of conditional expression (9) is below the lower limit, the focal length of the lens group closest to the object side among the lens groups having positive refractive power in the rear group GR becomes short, so that spherical aberration and coma are corrected. becomes difficult.
  • the lower limit of conditional expression (9) By setting the lower limit of conditional expression (9) to 0.53, 0.55, 0.58, 0.60, 0.63, 0.65, and further to 0.68, the effect of each embodiment is can be made more secure.
  • the focusing group GF has negative refractive power and satisfies the following conditional expression (10). 0.50 ⁇ fRw/(-fF) ⁇ 4.00 (10) where fRw: the focal length of the rear group GR in the wide-angle end state fF: the focal length of the focusing group GF
  • Conditional expression (10) defines an appropriate relationship between the focal length of the rear group GR in the wide-angle end state and the focal length of the focusing group GF having negative refractive power. By satisfying the conditional expression (10), it is possible to satisfactorily correct various aberrations while maintaining a small size.
  • conditional expression (10) If the value corresponding to conditional expression (10) is out of the above range, it becomes difficult to correct various aberrations while miniaturizing the variable magnification optical system ZL.
  • the upper limit of conditional expression (10) is 3.75, 3.50, 3.25, 3.00, 2.75, 2.50, 2.25, 2.00, 1.90, 1.80, Furthermore, by setting it to 1.70, the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (10) By setting the lower limit of conditional expression (10) to 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, and further to 0.90, The effect of each embodiment can be made more reliable.
  • the focusing group GF has negative refractive power and satisfies the following conditional expression (11). 0.50 ⁇ fRt/(-fF) ⁇ 5.00 (11)
  • fRt the focal length of the rear group GR in the telephoto end state
  • fF the focal length of the focusing group GF
  • Conditional expression (11) defines an appropriate relationship between the focal length of the rear group GR in the telephoto end state and the focal length of the focusing group GF having negative refractive power. By satisfying conditional expression (11), it is possible to satisfactorily correct various aberrations while maintaining a small size.
  • conditional expression (11) If the value corresponding to conditional expression (11) is out of the above range, it becomes difficult to correct various aberrations while miniaturizing the variable magnification optical system ZL.
  • the upper limit of conditional expression (11) is 4.75, 4.50, 4.25, 4.00, 3.75, 3.50, 3.25, 3.00, 2.75, 2.50, Furthermore, by setting it to 2.25, the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (11) is 0.60, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1. By setting it to 10, and further to 1.15, the effect of each embodiment can be made more reliable.
  • the focusing group GF has positive refractive power and satisfies the following conditional expression (12). 0.50 ⁇ ft/fF ⁇ 10.00 (12) where ft is the focal length of the variable power optical system ZL in the telephoto end state fF is the focal length of the focusing group GF
  • Conditional expression (12) defines an appropriate relationship between the focal length of the variable magnification optical system ZL in the telephoto end state and the focal length of the focusing group GF having positive refractive power.
  • conditional expression (12) If the corresponding value of conditional expression (12) is out of the above range, the amount of movement of the focusing group GF will be large, resulting in spherical aberration, coma and field curvature when focusing on a short-distance object. It becomes difficult to control fluctuations.
  • the upper limit of conditional expression (12) is 8.50, 7.00, 6.00, 5.00, 4.50, 4.00, 3.50, 3.00, 2.75, 2.50, By setting it to 2.25 and further to 2.00, the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (12) is 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.90, 0.95, 1.00, 1. By setting it to 05 and further to 1.10, the effect of each embodiment can be made more reliable.
  • variable magnification optical system ZL In the variable magnification optical system ZL according to the first to fourth embodiments, it is desirable that the focusing group GF has positive refractive power and satisfies the following conditional expression (13). 0.30 ⁇ fw/fF ⁇ 7.00 (13) where fw: focal length of variable-magnification optical system ZL in the wide-angle end state fF: focal length of focusing group GF
  • Conditional expression (13) defines an appropriate relationship between the focal length of the variable magnification optical system ZL in the wide-angle end state and the focal length of the focusing group GF having positive refractive power.
  • conditional expression (13) If the corresponding value of conditional expression (13) is out of the above range, the amount of movement of the focusing group GF becomes large. It becomes difficult to control fluctuations.
  • the upper limit of conditional expression (13) is 6.00, 5.00, 4.50, 4.00, 3.50, 3.00, 2.75, 2.50, 2.25, 2.00, By setting it to 1.75, 1.50, and further 1.25, the effect of each embodiment can be made more reliable. Further, by setting the lower limit of conditional expression (13) to 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, and further to 0.65, The effect can be made more reliable.
  • the focusing group GF has positive refractive power and satisfies the following conditional expression (14). 0.30 ⁇ (-fFRw)/fF ⁇ 7.00 (14)
  • fFRw the focal length of the lens group composed of lenses arranged closer to the image side than the focusing group GF in the wide-angle end state
  • fF the focal length of the focusing group GF
  • Conditional expression (14) defines the focal length of the lens group (image-side lens group GFR) composed of lenses arranged closer to the image side than the focusing group GF in the wide-angle end state, and the focal length having positive refractive power. It defines an appropriate relationship with the focal length of the group GF.
  • conditional expression (14) If the corresponding value of conditional expression (14) exceeds the upper limit, the focal length of the focusing group GF becomes too short with respect to the focal length of the image-side lens group GFR. It becomes difficult to suppress variations in coma and curvature of field.
  • the upper limit of conditional expression (14) is 6.00, 5.00, 4.50, 4.00, 3.50, 3.00, 2.75, 2.50, 2.25, 2.00, By setting it to 1.75, 1.50, and further 1.30, the effect of each embodiment can be made more reliable.
  • conditional expression (14) When the corresponding value of conditional expression (14) is below the lower limit, the amount of movement of the focusing group GF becomes large, so that fluctuations in spherical aberration, coma, and curvature of field when focusing on a short-distance object are suppressed. difficult to suppress.
  • the lower limit of conditional expression (14) is 0.40, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, Furthermore, by setting it to 0.95, the effect of each embodiment can be made more reliable.
  • the focusing group GF has positive refractive power and satisfies the following conditional expression (15). 0.30 ⁇ (-fFRt)/fF ⁇ 7.00 (15) where fFRt is the focal length of the lens group composed of lenses arranged closer to the image side than the focusing group GF in the telephoto end state fF: the focal length of the focusing group GF
  • Conditional expression (15) defines the focal length of the lens group (image-side lens group GFR) composed of lenses arranged closer to the image side than the focusing group GF in the telephoto end state, and the focal length of the lens group GFR having positive refractive power. It defines an appropriate relationship with the focal length of the group GF.
  • conditional expression (15) exceeds the upper limit, the focal length of the focusing group GF becomes too short with respect to the focal length of the image-side lens group GFR. It becomes difficult to suppress variations in coma and curvature of field.
  • the upper limit of conditional expression (15) is 6.00, 5.00, 4.50, 4.00, 3.75, 3.50, 3.00, 3.25, 3.00, 2.75, By setting it to 2.50 and further to 2.25, the effect of each embodiment can be made more reliable.
  • conditional expression (15) When the corresponding value of conditional expression (15) is below the lower limit, the amount of movement of the focusing group GF becomes large, so that fluctuations in spherical aberration, coma, and curvature of field when focusing on a short-distance object are suppressed. difficult to suppress.
  • the lower limit of conditional expression (15) is 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.05, 1.10, and further 1.15 , the effect of each embodiment can be made more reliable.
  • the focusing group GF has positive refractive power and satisfies the following conditional expression (16). 0.20 ⁇ fRPF/fF ⁇ 3.00 (16) However, fRPF: the focal length of the lens group closest to the object side among the lens groups having positive refractive power in at least one lens group of the rear group GR fF: the focal length of the focusing group GF
  • Conditional expression (16) defines the focal length of the lens group closest to the object side among the lens groups having positive refractive power among at least one lens group in the rear group GR, and the focal length of the focusing group GF having positive refractive power. It defines an appropriate relationship with the focal length.
  • conditional expression (16) When the corresponding value of conditional expression (16) exceeds the upper limit, the focal length of the focusing group GF becomes short, so that fluctuations in spherical aberration, coma, and curvature of field when focusing on a short-distance object are reduced. difficult to suppress.
  • the upper limit of conditional expression (16) is 2.75, 2.50, 2.25, 2.00, 1.75, 1.50, 1.25, 1.00, 0.95, and further 0.90 , the effect of each embodiment can be made more reliable.
  • conditional expression (16) When the corresponding value of conditional expression (16) is below the lower limit, the focal length of the lens group closest to the object side among the lens groups having positive refractive power in the rear group GR becomes short, so that spherical aberration and coma are corrected. becomes difficult.
  • the lower limit of conditional expression (16) By setting the lower limit of conditional expression (16) to 0.25, 0.30, 0.35, 0.40, and further to 0.45, the effect of each embodiment can be made more reliable. can.
  • the focusing group GF has positive refractive power and satisfies the following conditional expression (17). 0.15 ⁇ fRw/fF ⁇ 4.00 (17) where fRw: the focal length of the rear group GR in the wide-angle end state fF: the focal length of the focusing group GF
  • Conditional expression (17) defines an appropriate relationship between the focal length of the rear group GR in the wide-angle end state and the focal length of the focusing group GF having positive refractive power.
  • conditional expression (17) If the corresponding value of conditional expression (17) exceeds the upper limit, it becomes difficult to correct various aberrations while miniaturizing the variable power optical system ZL.
  • the focusing group GF has positive refractive power and satisfies the following conditional expression (18). 0.15 ⁇ fRt/fF ⁇ 5.00 (18) However, fRt: the focal length of the rear group GR in the telephoto end state fF: the focal length of the focusing group GF
  • Conditional expression (18) defines an appropriate relationship between the focal length of the rear group GR in the telephoto end state and the focal length of the focusing group GF having positive refractive power.
  • conditional expression (18) If the corresponding value of conditional expression (18) exceeds the upper limit, it becomes difficult to correct various aberrations while miniaturizing the variable power optical system ZL.
  • the upper limit of conditional expression (18) to 4.50, 4.00, 3.75, 3.50, 3.25, 3.00, 2.75, 2.50, and further to 2.30 , the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (18) is set to 0.20, 0.25, 0.30, 0.33, 0.35, 0.38, 0.40, 0.43, 0.45, and further to 0 By setting it to 0.48, the effect of each embodiment can be made more reliable.
  • variable magnification optical system ZL it is desirable that at least one lens group of the rear group GR is a plurality of lens groups. This makes it possible to satisfactorily correct the curvature of field.
  • At least one lens group of the rear group GR includes a second lens group G2 having positive refractive power disposed closest to the object side of the rear group GR. should be included. This makes it possible to satisfactorily correct spherical aberration and coma.
  • At least one lens group of the rear group GR includes a final lens group GE having positive refractive power and disposed closest to the image side of the rear group GR. is desirable. This makes it possible to satisfactorily correct the curvature of field.
  • variable power optical system ZL preferably satisfies the following conditional expression (19). 0.10 ⁇ fRPF/fRPR ⁇ 0.60 (19) where fRPF: the focal length of the lens group closest to the object side among the lens groups having positive refractive power among at least one lens group of the rear group GR; Focal length of the lens group closest to the image side in the lens group with refractive power
  • Conditional expression (19) defines the focal length of the lens group closest to the object side among the lens groups having positive refractive power among at least one lens group of the rear group GR, and , and the focal length of the lens group closest to the image side among the lens groups having positive refractive power.
  • conditional expression (19) When the corresponding value of conditional expression (19) exceeds the upper limit, the focal length of the lens group closest to the image side among the lens groups having positive refractive power in the rear group GR becomes short, so that field curvature can be corrected. become difficult.
  • the upper limit of conditional expression (19) By setting the upper limit of conditional expression (19) to 0.55, 0.50, 0.48, 0.45, 0.43, and further to 0.40, the effect of each embodiment is more reliable. can be
  • conditional expression (19) When the corresponding value of conditional expression (19) is below the lower limit, the focal length of the lens group closest to the object side among the lens groups having positive refractive power in the rear group GR becomes short, so that spherical aberration and coma are corrected. becomes difficult.
  • the lower limit of conditional expression (19) By setting the lower limit of conditional expression (19) to 0.13, 0.15, 0.18, and further to 0.20, the effect of each embodiment can be made more reliable.
  • variable power optical system ZL preferably satisfies the following conditional expression (20). 0.05 ⁇ Bfw/fRPR ⁇ 0.35 (20) where Bfw: back focus of the variable magnification optical system ZL in the wide-angle end state fRPR: the focal length of the lens group closest to the image side among the at least one lens group in the rear group GR and having positive refractive power
  • Conditional expression (20) defines the back focus of the variable magnification optical system ZL in the wide-angle end state and the focal point of the lens group closest to the image side among at least one lens group of the rear group GR having positive refractive power. It defines an appropriate relationship with distance. By satisfying the conditional expression (20), it is possible to satisfactorily correct various aberrations such as curvature of field while maintaining a small size.
  • the back focus of the variable power optical system ZL is the distance on the optical axis from the lens surface closest to the image side of the variable power optical system ZL to the image plane I when focusing on infinity (air conversion distance ).
  • conditional expression (20) When the corresponding value of conditional expression (20) exceeds the upper limit, the focal length of the lens group closest to the image side among the lens groups having positive refractive power in the rear group GR becomes short, so that field curvature can be corrected. become difficult.
  • the upper limit of conditional expression (20) By setting the upper limit of conditional expression (20) to 0.33, 0.30, 0.28, 0.25, and further to 0.23, the effect of each embodiment can be made more reliable. can.
  • conditional expression (20) When the corresponding value of conditional expression (20) is below the lower limit, the focal length of the lens group closest to the image side among the lens groups having positive refractive power in the rear group GR becomes too long, so that the curvature of field is sufficiently corrected. becomes difficult to do.
  • the lower limit of conditional expression (20) By setting the lower limit of conditional expression (20) to 0.06, and further to 0.08, the effect of each embodiment can be made more reliable.
  • variable power optical system ZL it is desirable that the lens disposed closest to the object side in the rear group GR is a positive lens. This makes it possible to satisfactorily correct the curvature of field.
  • variable power optical system ZL it is desirable that the variable power optical system ZL according to the first to fourth embodiments have a diaphragm arranged between the first lens group G1 and the rear group GR. As a result, coma aberration can be satisfactorily corrected.
  • variable power optical system ZL preferably satisfies the following conditional expression (21). 60.00° ⁇ 2 ⁇ w ⁇ 90.00° (21) where 2 ⁇ w: the total angle of view of the variable magnification optical system ZL in the wide-angle end state
  • Conditional expression (21) defines an appropriate range for the total angle of view of the variable power optical system ZL in the wide-angle end state. Satisfying the conditional expression (21) is preferable because it is possible to obtain a compact variable magnification optical system having good optical performance.
  • the upper limit of conditional expression (21) By setting the upper limit of conditional expression (21) to 85.00°, 83.00°, 80.00°, and further to 78.00°, the effect of each embodiment can be made more reliable. can.
  • variable power optical system ZL preferably satisfies the following conditional expression (22). 1.50 ⁇ (-f1)/fRw ⁇ 3.00 (22) where f1: focal length of the first lens group G1 fRw: focal length of the rear group GR in the wide-angle end state
  • Conditional expression (22) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the rear group GR in the wide-angle end state. Satisfying conditional expression (22) makes it possible to obtain good optical performance over the entire range of zooming while maintaining a small size.
  • conditional expression (22) When the corresponding value of conditional expression (22) exceeds the upper limit, it becomes difficult to correct spherical aberration and coma.
  • the upper limit of conditional expression (22) By setting the upper limit of conditional expression (22) to 2.95, 2.90, 2.85, 2.80, 2.75, and further to 2.70, the effect of each embodiment is more reliable. can be
  • conditional expression (22) If the corresponding value of conditional expression (22) falls below the lower limit, it becomes difficult to correct spherical aberration and curvature of field.
  • the lower limit of conditional expression (22) By setting the lower limit of conditional expression (22) to 1.55, 1.60, 1.65, 1.70, 1.75, and further to 1.80, the effect of each embodiment is more reliable. can be
  • variable power optical system ZL preferably satisfies the following conditional expression (23). 0.50 ⁇ (-f1)/fRt ⁇ 2.50 (23) where f1: focal length of the first lens group G1 fRt: focal length of the rear group GR in the telephoto end state
  • Conditional expression (23) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the rear group GR in the telephoto end state. Satisfying conditional expression (23) makes it possible to obtain good optical performance over the entire range of zooming while maintaining a small size.
  • conditional expression (23) When the corresponding value of conditional expression (23) exceeds the upper limit, it becomes difficult to correct spherical aberration and coma.
  • the upper limit of conditional expression (23) By setting the upper limit of conditional expression (23) to 2.40, 2.30, 2.20, 2.10, 2.05, and further to 2.00, the effect of each embodiment can be made more reliable. can be
  • conditional expression (23) If the corresponding value of conditional expression (23) falls below the lower limit, it becomes difficult to correct spherical aberration and curvature of field.
  • the lower limit of conditional expression (23) By setting the lower limit of conditional expression (23) to 0.55, 0.65, 0.75, 0.85, and further 0.90, the effect of each embodiment can be made more reliable. can.
  • the first lens group G1 having negative refractive power and the rear group GR having at least one lens group are arranged in order from the object side along the optical axis (step ST1).
  • it is configured so that the distance between adjacent lens groups changes during zooming (step ST2).
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expression (1) (step ST3).
  • the manufacturing method of the variable power optical system ZL according to the second embodiment is the same as the manufacturing method described in the first embodiment, it will be described with reference to FIG. 24, which is the same as in the first embodiment.
  • the first lens group G1 having negative refractive power and the rear group GR having at least one lens group are arranged in order from the object side along the optical axis (step ST1).
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expression (2) (step ST3). According to such a manufacturing method, it is possible to manufacture a variable-magnification optical system that is compact and yet has good optical performance.
  • the manufacturing method of the variable power optical system ZL according to the third embodiment is the same as the manufacturing method described in the first embodiment, it will be described with reference to FIG. 24, which is the same as in the first embodiment.
  • the first lens group G1 having negative refractive power and the rear group GR having at least one lens group are arranged in order from the object side along the optical axis (step ST1).
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expression (3) (step ST3). According to such a manufacturing method, it is possible to manufacture a variable-magnification optical system that is compact and yet has good optical performance.
  • the manufacturing method of the variable magnification optical system ZL according to the fourth embodiment is the same as the manufacturing method described in the first embodiment, it will be described with reference to FIG. 24, which is the same as in the first embodiment.
  • the first lens group G1 having negative refractive power and the rear group GR having at least one lens group are arranged in order from the object side along the optical axis (step ST1).
  • it is configured so that the distance between adjacent lens groups changes during zooming step ST2.
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expression (4) (step ST3). According to such a manufacturing method, it is possible to manufacture a variable-magnification optical system that is compact and yet has good optical performance.
  • FIGS. 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, and 21 show variable power optical systems ZL ⁇ ZL ⁇ according to first to eleventh embodiments. (1) to ZL(11) ⁇ and a sectional view showing the distribution of refractive power.
  • the direction of movement of the focusing group along the optical axis when focusing on a close object from infinity is shown as It is indicated by an arrow together with the word "focus".
  • each lens group is designated by a combination of a symbol G and a number.
  • Each is represented by a combination of a 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.
  • Tables 1 to 11 are shown below, of which Table 1 is the first embodiment, Table 2 is the second embodiment, Table 3 is the third embodiment, Table 4 is the fourth embodiment, and Table 5 is the third embodiment.
  • Table 6 is the sixth embodiment, Table 7 is the seventh embodiment, Table 8 is the eighth embodiment, Table 9 is the ninth embodiment, Table 10 is the tenth embodiment, and Table 11 is the eleventh embodiment. It is a table
  • f is the focal length of the entire lens system
  • FNO is the F number
  • ⁇ is the half angle of view (unit is ° (degrees))
  • Y is the image height.
  • TL indicates the distance obtained by adding Bf (back focus) to the distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image side of the variable-magnification optical system when focusing at infinity, where Bf is infinity. It shows the distance (air conversion distance) on the optical axis from the most image side lens surface of the variable power optical system to the image plane at the time of focusing. Note that these values are shown for each of the zooming states of the wide-angle end (W) and the telephoto end (T).
  • fF indicates the focal length of the focusing group.
  • fRw represents the focal length of the rear group in the wide-angle end state.
  • fRt indicates the focal length of the rear group in the telephoto end state.
  • fFRw indicates the focal length of a lens group (image-side lens group) composed of lenses arranged closer to the image side than the in-focus group in the wide-angle end state.
  • fFRt indicates the focal length of a lens group (image-side lens group) composed of lenses arranged closer to the image side than the in-focus group in the telephoto end state.
  • fRPF indicates the focal length of the lens group closest to the object side among the lens groups having positive refractive power among at least one lens group of the rear group.
  • fRPR indicates the focal length of the lens group closest to the image side among the at least one lens group in the rear group and having positive refractive power.
  • ⁇ Rw indicates the lateral magnification of the rear group in the wide-angle end state.
  • ⁇ Rt indicates the lateral magnification of the rear group in the telephoto end state.
  • 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.
  • 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 a variable magnification optical system according to the first embodiment.
  • the variable power optical system ZL(1) according to the first example includes a first lens group G1 having negative refractive power, an aperture stop S, and a positive refractive power, 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 positive refractive power.
  • the first lens group G1 When zooming from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 first moves along the optical axis toward the image side, then toward the object side, and then moves to the second lens group G2.
  • the third lens group G3 moves along the optical axis toward the object side, and the distance between adjacent lens groups changes.
  • the aperture stop S moves along the optical axis together with the second lens group G2, and the position of the fourth lens group G4 is fixed with respect to the image plane I.
  • 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 first lens group G1 includes a cemented lens composed of a plano-convex positive lens L11 having a flat surface facing the object side and a biconcave negative lens L12 arranged in order from the object side along the optical axis, and a biconcave cemented lens. and a negative lens L13.
  • the second lens group G2 includes a positive meniscus lens L21 with a convex surface facing the object side, a biconvex positive lens L22, and a positive meniscus lens with a concave surface facing the object side, which are arranged in order from the object side along the optical axis. It is composed of a cemented lens of a lens L23 and a negative meniscus lens L24 having a concave surface facing the object side, a positive meniscus lens L25 having a concave surface facing the object side, and a negative meniscus lens L26 having a concave surface facing the object side. .
  • the positive meniscus lens L21 has aspheric lens surfaces on both sides.
  • the positive meniscus lens L25 has aspheric lens surfaces on both sides.
  • the negative meniscus lens L26 has an aspheric lens surface on the image side.
  • the third lens group G3 is composed of a positive meniscus lens L31 with a concave surface facing the object side.
  • the fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side.
  • the positive meniscus lens L41 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fourth lens group G4. Between the fourth lens group G4 and the image plane I, a parallel plate PP is arranged.
  • the second lens group G2, the third lens group G3, and the fourth lens group G4 constitute a rear group GR having positive refractive power as a whole.
  • the fourth lens group G4 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the positive meniscus lens L25 and the negative meniscus lens L26 of the second lens group G2 constitute a focusing group GF that moves along the optical axis during focusing.
  • the focusing group GF (the positive meniscus lens L25 and the negative meniscus lens L26 of the second lens group G2) moves along the optical axis toward the image side.
  • the third lens group G3 (positive meniscus lens L31) and the fourth lens group G4 (positive meniscus lens L41) form an image-side lens group GFR consisting of lenses arranged closer to the image side than the focusing group GF.
  • Table 1 below lists the values of the specifications of the variable power optical system according to the first example.
  • FIG. 2(A) is a diagram of various aberrations when focusing on infinity in the wide-angle end state of the variable power optical system according to the first example.
  • FIG. 2B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the first embodiment when focusing on infinity.
  • FNO indicates F number
  • Y indicates image height.
  • the spherical aberration diagram shows the F-number value 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.
  • variable magnification optical system according to Example 1 has excellent imaging performance, with various aberrations well corrected from the wide-angle end state to the telephoto end state.
  • FIG. 3 is a diagram showing the lens configuration of the variable magnification optical system according to the second embodiment.
  • the variable power optical system ZL(2) according to the second embodiment includes a first lens group G1 having negative refractive power, an aperture stop S, and a positive 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 positive refractive power.
  • the first lens group G1 When zooming from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 first moves along the optical axis toward the image side, then toward the object side, and then moves to the second lens group G2.
  • the third lens group G3 moves along the optical axis toward the object side, and the distance between adjacent lens groups changes.
  • the aperture stop S moves along the optical axis together with the second lens group G2, and the position of the fourth lens group G4 is fixed with respect to the image plane I.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are constructed in the same manner as in the first embodiment. , and the detailed description of each of these lenses is omitted.
  • the second lens group G2, the third lens group G3, and the fourth lens group G4 constitute a rear group GR having positive refractive power as a whole.
  • the fourth lens group G4 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the positive meniscus lens L25 and the negative meniscus lens L26 of the second lens group G2 constitute a focusing group GF that moves along the optical axis during focusing.
  • the focusing group GF (the positive meniscus lens L25 and the negative meniscus lens L26 of the second lens group G2) moves along the optical axis toward the image side.
  • Table 2 below lists the values of the specifications of the variable power optical system according to the second example.
  • FIG. 4(A) is a diagram of various aberrations when focusing on infinity in the wide-angle end state of the variable power optical system according to the second embodiment.
  • FIG. 4B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the second embodiment when focusing on infinity. From the various aberration diagrams, it can be seen that the variable power optical system according to the second example has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 5 is a diagram showing the lens configuration of the variable magnification optical system according to the third embodiment.
  • the variable magnification optical system ZL(3) according to the third embodiment includes a first lens group G1 having negative refractive power, an aperture diaphragm S, and a positive refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1 When zooming from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 first moves along the optical axis toward the image side, then toward the object side, and then moves to the second lens group G2.
  • the third lens group G3 and the fourth lens group G4 move along the optical axis toward the object side, and the distance between the adjacent lens groups changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 includes a cemented lens composed of a plano-convex positive lens L11 having a flat surface facing the object side and a biconcave negative lens L12 arranged in order from the object side along the optical axis, and a biconcave cemented lens. and a negative lens L13.
  • the second lens group G2 includes a positive meniscus lens L21 with a convex surface facing the object side, a biconvex positive lens L22, and a positive meniscus lens with a concave surface facing the object side, which are arranged in order from the object side along the optical axis. It is composed of a cemented lens of a lens L23 and a negative meniscus lens L24 having a concave surface facing the object side.
  • the positive meniscus lens L21 has aspheric lens surfaces on both sides.
  • the third lens group G3 is composed of a positive meniscus lens L31 with a concave surface facing the object side and a negative meniscus lens L32 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the positive meniscus lens L31 has aspheric lens surfaces on both sides.
  • the negative meniscus lens L32 has an aspheric lens surface on the image side.
  • the fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • the positive meniscus lens L51 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fifth lens group G5. Between the fifth lens group G5 and the image plane I, a parallel plate PP is arranged.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the image side.
  • the fourth lens group G4 (positive meniscus lens L41) and the fifth lens group G5 (positive meniscus lens L51) form an image-side lens group GFR consisting of lenses arranged closer to the image side than the focusing group GF.
  • Table 3 lists the values of the specifications of the variable power optical system according to the third example.
  • FIG. 6(A) is a diagram of various aberrations in the wide-angle end state of the variable power optical system according to the third embodiment when focusing on infinity.
  • FIG. 6B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the third embodiment when focusing at infinity. From the various aberration diagrams, it can be seen that the variable magnification optical system according to the third example has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 7 is a diagram showing the lens configuration of a variable-magnification optical system according to the fourth embodiment.
  • the variable magnification optical system ZL(4) according to the fourth embodiment includes a first lens group G1 having negative refractive power, an aperture diaphragm S, and a positive refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having negative refractive power, and a fourth lens group G4 having positive refractive power.
  • the first lens group G1 When zooming from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 first moves along the optical axis toward the image side, then toward the object side, and then moves to the second lens group G2.
  • the third lens group G3 moves along the optical axis toward the object side, and the distance between adjacent lens groups changes.
  • the aperture stop S moves along the optical axis together with the second lens group G2, and the position of the fourth lens group G4 is fixed with respect to the image plane I.
  • the first lens group G1 includes a cemented lens constructed by a positive meniscus lens L11 having a concave surface facing the object side and a biconcave negative lens L12 arranged in order from the object side along the optical axis, and a cemented lens having a concave surface facing the object side. and a negative meniscus lens L13.
  • the second lens group G2 includes a biconvex positive lens L21, a negative meniscus lens L22 with a convex surface facing the object side, and a positive meniscus lens L22 with a convex surface facing the object side, arranged in order from the object side along the optical axis. and a lens L23.
  • the positive lens L21 has aspheric lens surfaces on both sides.
  • the positive meniscus lens L23 has aspherical lens surfaces on both sides.
  • the third lens group G3 is composed of a negative meniscus lens L31 with a convex surface facing the object side and a negative meniscus lens L32 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative meniscus lens L31 has an aspheric lens surface on the image side. Both lens surfaces of the negative meniscus lens L32 are aspheric.
  • the fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side.
  • the positive meniscus lens L41 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fourth lens group G4. Between the fourth lens group G4 and the image plane I, a parallel plate PP is arranged.
  • the second lens group G2, the third lens group G3, and the fourth lens group G4 constitute a rear group GR having positive refractive power as a whole.
  • the fourth lens group G4 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing.
  • the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the image side.
  • the fourth lens group G4 (positive meniscus lens L41) constitutes an image-side lens group GFR, which is a lens arranged closer to the image side than the focusing group GF.
  • Table 4 lists the values of the specifications of the variable power optical system according to the fourth example.
  • FIG. 8(A) is a diagram of various aberrations when focusing on infinity in the wide-angle end state of the variable power optical system according to the fourth example.
  • FIG. 8B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the fourth example when focusing on infinity. From the various aberration diagrams, it can be seen that the variable magnification optical system according to the fourth example has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 9 is a diagram showing the lens configuration of the variable power optical system according to the fifth embodiment.
  • the variable magnification optical system ZL(5) according to the fifth embodiment includes a first lens group G1 having negative refractive power, an aperture diaphragm S, and a positive refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1 When zooming from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 first moves along the optical axis toward the image side, then toward the object side, and then moves to the second lens group G2.
  • the third lens group G3 moves along the optical axis toward the object side
  • the fourth lens group G4 moves along the optical axis once toward the object side and then toward the image side, and the distance between the adjacent lens groups increases. changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 includes a cemented lens constructed by a positive meniscus lens L11 having a concave surface facing the object side and a biconcave negative lens L12 arranged in order from the object side along the optical axis, and a cemented lens having a concave surface facing the object side. and a negative meniscus lens L13.
  • the second lens group G2 includes a biconvex positive lens L21, a negative meniscus lens L22 with a convex surface facing the object side, and a positive meniscus lens L22 with a convex surface facing the object side, arranged in order from the object side along the optical axis. and a lens L23.
  • the positive lens L21 has aspheric lens surfaces on both sides.
  • the positive meniscus lens L23 has aspherical lens surfaces on both sides.
  • the third lens group G3 is composed of a biconvex positive lens L31 and a negative meniscus lens L32 having a concave surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the positive lens L31 has an aspheric lens surface on the image side. Both lens surfaces of the negative meniscus lens L32 are aspheric.
  • the fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side.
  • the positive meniscus lens L41 has an aspheric lens surface on the image side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • An image plane I is arranged on the image side of the fifth lens group G5. Between the fifth lens group G5 and the image plane I, a parallel plate PP is arranged.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the image side.
  • the fourth lens group G4 (positive meniscus lens L41) and the fifth lens group G5 (positive meniscus lens L51) form an image-side lens group GFR consisting of lenses arranged closer to the image side than the focusing group GF.
  • Table 5 lists the values of the specifications of the variable power optical system according to the fifth example.
  • FIG. 10(A) is a diagram of various aberrations when focusing on infinity in the wide-angle end state of the variable power optical system according to the fifth example.
  • FIG. 10B is a diagram of various aberrations in the telephoto end state of the variable magnification optical system according to the fifth embodiment when focusing at infinity. From the various aberration diagrams, it can be seen that the variable power optical system according to the fifth example has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 11 is a diagram showing the lens configuration of the variable magnification optical system according to the sixth embodiment.
  • a variable magnification optical system ZL(6) according to the sixth embodiment includes a first lens group G1 having negative refractive power, an aperture stop S, and a positive refractive power, arranged in order from the object side along the optical axis. , a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1 When zooming from the wide-angle end state (W) to the telephoto end state (T), the first lens group G1 first moves along the optical axis toward the image side, then toward the object side, and then moves to the second lens group G2.
  • the third lens group G3 and the fourth lens group G4 move along the optical axis toward the object side, and the distance between the adjacent lens groups changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 includes a cemented lens composed of a plano-convex positive lens L11 having a flat surface facing the object side and a biconcave negative lens L12 arranged in order from the object side along the optical axis, and a biconcave cemented lens. and a negative lens L13.
  • the second lens group G2 includes a biconvex positive lens L21, a biconcave negative lens L22, and a positive meniscus lens L23 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis. and a negative meniscus lens L24 having a concave surface facing the object side.
  • the positive lens L21 has aspheric lens surfaces on both sides.
  • the negative lens L22 has aspheric lens surfaces on both sides.
  • the negative meniscus lens L24 has aspheric lens surfaces on both sides.
  • the third lens group G3 is composed of a negative meniscus lens L31 with a concave surface facing the object side. Both lens surfaces of the negative meniscus lens L31 are aspheric.
  • the fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • the positive meniscus lens L51 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fifth lens group G5. Between the fifth lens group G5 and the image plane I, a parallel plate PP is arranged.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the image side.
  • the fourth lens group G4 (positive meniscus lens L41) and the fifth lens group G5 (positive meniscus lens L51) form an image-side lens group GFR consisting of lenses arranged closer to the image side than the focusing group GF.
  • Table 6 lists the values of the specifications of the variable power optical system according to the sixth example.
  • FIG. 12(A) is a diagram of various aberrations when focusing on infinity in the wide-angle end state of the variable power optical system according to the sixth embodiment.
  • FIG. 12B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the sixth example when focusing on infinity. From the various aberration diagrams, it can be seen that the variable magnification optical system according to the sixth example has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 13 is a diagram showing the lens configuration of a variable magnification optical system according to the seventh embodiment.
  • the variable magnification optical system ZL(7) according to the seventh embodiment includes a first lens group G1 having negative refractive power, an aperture stop S, and a positive refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are aligned with the optical axis. , and the distance between adjacent lens groups changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 is composed of a biconcave negative lens L11 and a positive meniscus lens L12 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative lens L11 has aspheric lens surfaces on both sides.
  • the second lens group G2 includes a positive meniscus lens L21 with a convex surface facing the object side, a biconvex positive lens L22, and a negative meniscus lens with a convex surface facing the object side, which are arranged in order from the object side along the optical axis. and a lens L23.
  • the positive meniscus lens L21 has aspheric lens surfaces on both sides.
  • the third lens group G3 is composed of a negative meniscus lens L31 having a concave surface facing the object side 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 image side.
  • the fourth lens group G4 is composed of a negative meniscus lens L41 with a concave surface facing the object side.
  • the negative meniscus lens L41 has an aspheric lens surface on the object side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • the positive meniscus lens L51 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fifth lens group G5.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the object side.
  • the fourth lens group G4 (negative meniscus lens L41) and the fifth lens group G5 (positive meniscus lens L51) form an image-side lens group GFR consisting of lenses arranged closer to the image side than the focusing group GF.
  • Table 7 lists the values of the specifications of the variable-magnification optical system according to the seventh embodiment.
  • FIG. 14(A) is a diagram of various aberrations in the wide-angle end state of the variable power optical system according to the seventh embodiment when focusing on infinity.
  • FIG. 14B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the seventh example when focusing on infinity. From the various aberration diagrams, it can be seen that the variable-power optical system according to the seventh example has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 15 is a diagram showing the lens configuration of the variable magnification optical system according to the eighth embodiment.
  • the variable magnification optical system ZL(8) according to the eighth embodiment includes a first lens group G1 having negative refractive power, an aperture diaphragm S, and a positive refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are aligned with the optical axis. , and the distance between adjacent lens groups changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 is composed of a biconcave negative lens L11 and a biconvex positive lens L12, which are arranged in order from the object side along the optical axis.
  • the negative lens L11 has aspheric lens surfaces on both sides.
  • the second lens group G2 is composed of a biconvex positive lens L21 and a negative meniscus lens L22 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the positive lens L21 has aspheric lens surfaces on both sides.
  • the third lens group G3 is composed of a negative meniscus lens L31 having a concave surface facing the object side 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 image side.
  • the fourth lens group G4 is composed of a negative meniscus lens L41 with a convex surface facing the object side and a negative meniscus lens L42 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative meniscus lens L42 has an aspheric lens surface on the image side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • the positive meniscus lens L51 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fifth lens group G5.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the object side.
  • the fourth lens group G4 negative meniscus lens L41 and negative meniscus lens L42
  • the fifth lens group G5 positive meniscus lens L51
  • the fourth lens group G4 negative meniscus lens L41 and negative meniscus lens L42
  • the fifth lens group G5 positive meniscus lens L51
  • Table 8 lists the values of the specifications of the variable-magnification optical system according to the eighth embodiment.
  • FIG. 16(A) is a diagram of various aberrations when focusing on infinity in the wide-angle end state of the variable power optical system according to the eighth embodiment.
  • FIG. 16B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the eighth embodiment when focusing at infinity. From the various aberration diagrams, it can be seen that the variable-power optical system according to the eighth embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 17 is a diagram showing the lens configuration of the variable magnification optical system according to the ninth embodiment.
  • a variable magnification optical system ZL(9) according to the ninth embodiment includes a first lens group G1 having negative refractive power, an aperture stop S, and a positive refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are aligned with the optical axis. , and the distance between adjacent lens groups changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 is composed of a biconcave negative lens L11 and a positive meniscus lens L12 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative lens L11 has aspheric lens surfaces on both sides.
  • the second lens group G2 includes a positive meniscus lens L21 having a convex surface facing the object side, a positive meniscus lens L22 having a convex surface facing the object side, and a convex surface facing the object side, which are arranged in order from the object side along the optical axis. and a negative meniscus lens L23.
  • the positive meniscus lens L21 has aspheric lens surfaces on both sides.
  • the third lens group G3 is composed of a negative meniscus lens L31 having a concave surface facing the object side 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 image side.
  • the fourth lens group G4 is composed of a negative meniscus lens L41 with a concave surface facing the object side.
  • the negative meniscus lens L41 has an aspheric lens surface on the image side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • the positive meniscus lens L51 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fifth lens group G5.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the object side.
  • the fourth lens group G4 (negative meniscus lens L41) and the fifth lens group G5 (positive meniscus lens L51) form an image-side lens group GFR consisting of lenses arranged closer to the image side than the focusing group GF.
  • Table 9 lists the values of the specifications of the variable magnification optical system according to the ninth embodiment.
  • FIG. 18(A) is a diagram of various aberrations in the wide-angle end state of the variable magnification optical system according to the ninth embodiment when focusing on infinity.
  • FIG. 18B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the ninth embodiment when focusing at infinity. From the various aberration diagrams, it can be seen that the variable-power optical system according to the ninth embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 19 is a diagram showing the lens configuration of the variable magnification optical system according to the tenth embodiment.
  • a variable power optical system ZL(10) according to the tenth embodiment includes a first lens group G1 having negative refractive power, an aperture stop S, and a positive refractive power, arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are aligned with the optical axis. , and the distance between adjacent lens groups changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 is composed of a biconcave negative lens L11 and a positive meniscus lens L12 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative lens L11 has aspheric lens surfaces on both sides.
  • the second lens group G2 includes a positive meniscus lens L21 with a convex surface facing the object side, a biconvex positive lens L22, and a negative meniscus lens with a convex surface facing the object side, which are arranged in order from the object side along the optical axis. and a lens L23.
  • the positive meniscus lens L21 has aspheric lens surfaces on both sides.
  • the positive lens L22 has an aspheric lens surface on the object side.
  • the third lens group G3 is composed of a negative meniscus lens L31 with a concave surface facing the object side and a positive meniscus lens L32 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the positive meniscus lens L32 has an aspheric lens surface on the image side.
  • the fourth lens group G4 is composed of a negative meniscus lens L41 with a concave surface facing the object side.
  • the negative meniscus lens L41 has an aspheric lens surface on the object side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • the positive meniscus lens L51 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fifth lens group G5.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the object side.
  • the fourth lens group G4 (negative meniscus lens L41) and the fifth lens group G5 (positive meniscus lens L51) form an image-side lens group GFR consisting of lenses arranged closer to the image side than the focusing group GF.
  • Table 10 lists the values of the specifications of the variable magnification optical system according to the tenth embodiment.
  • FIG. 20(A) is a diagram of various aberrations when focusing on infinity in the wide-angle end state of the variable power optical system according to the tenth embodiment.
  • FIG. 20B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the tenth embodiment when focusing at infinity. From the various aberration diagrams, it can be seen that the variable-power optical system according to the tenth embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • FIG. 21 is a diagram showing the lens configuration of the variable magnification optical system according to the eleventh embodiment.
  • the variable power optical system ZL(11) according to the eleventh embodiment includes a first lens group G1 having negative refractive power, an aperture stop S, and a positive refractive power, which are arranged in order from the object side along the optical axis. , a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power. be.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are aligned with the optical axis. , and the distance between adjacent lens groups changes.
  • the aperture diaphragm S moves along the optical axis together with the second lens group G2, and the position of the fifth lens group G5 is fixed with respect to the image plane I.
  • the first lens group G1 is composed of a biconcave negative lens L11 and a positive meniscus lens L12 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative lens L11 has aspheric lens surfaces on both sides.
  • the second lens group G2 is composed of a biconvex positive lens L21 and a negative meniscus lens L22 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the positive lens L21 has aspheric lens surfaces on both sides.
  • the third lens group G3 is composed of a negative meniscus lens L31 having a concave surface facing the object side 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 image side.
  • the fourth lens group G4 is composed of a negative meniscus lens L41 with a convex surface facing the object side and a negative meniscus lens L42 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative meniscus lens L42 has an aspheric lens surface on the image side.
  • the fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side.
  • the positive meniscus lens L51 has an aspheric lens surface on the image side.
  • An image plane I is arranged on the image side of the fifth lens group G5.
  • the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute a rear group GR having positive refractive power as a whole.
  • the fifth lens group G5 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the entire third lens group G3 constitutes a focusing group GF that moves along the optical axis during focusing. During focusing from an infinity object to a close object, the focusing group GF (the entirety of the third lens group G3) moves along the optical axis toward the object side.
  • the fourth lens group G4 negative meniscus lens L41 and negative meniscus lens L42
  • the fifth lens group G5 positive meniscus lens L51
  • the fourth lens group G4 negative meniscus lens L41 and negative meniscus lens L42
  • the fifth lens group G5 positive meniscus lens L51
  • Table 11 lists the values of the specifications of the variable magnification optical system according to the eleventh embodiment.
  • FIG. 22(A) is a diagram of various aberrations in the wide-angle end state of the variable magnification optical system according to the eleventh embodiment when focusing on infinity.
  • FIG. 22B is a diagram of various aberrations in the telephoto end state of the variable power optical system according to the eleventh embodiment when focusing on infinity. From the various aberration diagrams, it can be seen that the variable power optical system according to the eleventh embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and has excellent imaging performance.
  • Conditional expression (1) 0.90 ⁇ TLt/ft ⁇ 1.50
  • Conditional expression (2) 1.50 ⁇ TLw/fw ⁇ 2.30
  • Conditional expression (3) 0.50 ⁇ (-f1)/TLw ⁇ 1.50
  • Conditional expression (4) 0.35 ⁇ (-f1)/TLt ⁇ 1.25
  • Conditional expression (5) 1.50 ⁇ ft/(-fF) ⁇ 10.00
  • Conditional expression (6) 0.70 ⁇ fw/(-fF) ⁇ 7.00
  • Conditional expression (7) 1.00 ⁇ fFRw/(-fF) ⁇ 7.00
  • Conditional expression (8) 1.00 ⁇ fFRt/(-fF) ⁇ 7.00
  • Conditional expression (9) 0.50 ⁇ fRPF/(-fF) ⁇ 3.00
  • Conditional expression (10) 0.50 ⁇ fRw/(-fF) ⁇ 4.00
  • Conditional expression (11) 0.50 ⁇ fRt/(-fF) ⁇ 5.00
  • Conditional expression (12) 0.50 ⁇ fRw/(-fF) ⁇ 5.00
  • Conditional expression (12) 0.50 ⁇ f
  • variable-power optical system of the present embodiment Although four-group and five-group configurations have been shown as examples of the variable-power optical system of the present embodiment, the present application is not limited to this, and other group configurations (for example, six-group, seven-group, etc.) can be used for variable-magnification optical systems.
  • An optical system can also be constructed. Specifically, a configuration in which a lens or lens group is added to the most object side or most image plane side of the variable power optical system of the present embodiment may be used. Note that the lens group refers to a portion having at least one lens separated by an air gap that changes during zooming.
  • a single lens group, a plurality of lens groups, or a partial lens group may be moved in the optical axis direction to serve as a focusing lens group for focusing from an infinity object to a close object.
  • the focusing lens group can also be applied to autofocus, and is also suitable for motor drive (using an ultrasonic motor or the like) for autofocus.
  • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
PCT/JP2022/006338 2021-04-15 2022-02-17 変倍光学系、光学機器、および変倍光学系の製造方法 Ceased WO2022219918A1 (ja)

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US18/276,028 US20240118525A1 (en) 2021-04-15 2022-02-17 Zoom optical system, optical apparatus and method for manufacturing the zoom optical system
JP2024042939A JP7726316B2 (ja) 2021-04-15 2024-03-19 変倍光学系および光学機器
JP2025127401A JP2025142330A (ja) 2021-04-15 2025-07-30 変倍光学系および光学機器

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