WO2022172821A1 - 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
WO2022172821A1
WO2022172821A1 PCT/JP2022/003964 JP2022003964W WO2022172821A1 WO 2022172821 A1 WO2022172821 A1 WO 2022172821A1 JP 2022003964 W JP2022003964 W JP 2022003964W WO 2022172821 A1 WO2022172821 A1 WO 2022172821A1
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Prior art keywords
optical system
lens
variable
lens group
end state
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PCT/JP2022/003964
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English (en)
French (fr)
Japanese (ja)
Inventor
史哲 大竹
知之 幸島
貴博 石川
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Nikon Corp
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Nikon Corp
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Priority to JP2022580574A priority Critical patent/JP7690966B2/ja
Priority to CN202280012052.3A priority patent/CN116868104A/zh
Priority to US18/272,576 priority patent/US20240248288A1/en
Publication of WO2022172821A1 publication Critical patent/WO2022172821A1/ja
Anticipated expiration legal-status Critical
Priority to JP2025083049A priority patent/JP2025109883A/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
    • G02B15/144511—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
    • G02B13/18—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
    • 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, and the at least one lens group of the rear group includes a final lens group having a positive refractive power disposed closest to the image side of the rear group. and satisfies the following conditional expression. 0.15 ⁇ ft/fGE ⁇ 0.60 where ft is the focal length of the variable magnification optical system in the telephoto end state, fGE is the focal length of the final lens group
  • a variable magnification 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 an optical axis, During zooming, the distance between adjacent lens groups changes, satisfying the following conditional expression. 2.00 ⁇ TLt/IHw ⁇ 3.00 1.00 ⁇ (-f1)/fRw ⁇ 1.50 where TLt: the total length of the variable power optical system in the telephoto end state IHw: the maximum image height of the variable power optical system in the wide-angle end state f1: the focal length of the first lens group fRw: the rear group in the wide-angle end state Focal length
  • 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. wherein the distance between adjacent lens groups changes during zooming, and the at least one lens group of the rear group is positioned closest to the image side of the rear group.
  • Each lens is arranged in the lens barrel so as to satisfy the following conditional expression, including the final lens group having a positive refractive power. 0.15 ⁇ ft/fGE ⁇ 0.60 where ft is the focal length of the variable magnification optical system in the telephoto end state, fGE is the focal length of the final lens group
  • a method for 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: .
  • TLt the total length of the variable power optical system in the telephoto end state
  • IHw the maximum image height of the variable power optical system in the wide-angle end state
  • f1 the focal length of the first lens group
  • fRw the rear group in the wide-angle end state
  • Focal length the total length of the variable power 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. 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 the variable magnification optical system according to the first embodiment
  • 9 is a flow chart showing a method of manufacturing a variable magnification optical system according to the second embodiment;
  • this 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. 11 schematically shows a variable power optical system provided in the photographing lens 3, and the lens configuration of the variable power optical system ZL is not limited to this configuration. do not have.
  • a 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. At least one lens group of the rear group GR includes a final lens group GE having a positive refractive power and arranged closest to the image side of the rear group GR.
  • variable power optical system ZL satisfies the following conditional expression (1). 0.15 ⁇ ft/fGE ⁇ 0.60 (1) where ft is the focal length of the variable magnification optical system ZL in the telephoto end state fGE is the focal length of the final lens group GE
  • 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) or the variable power optical system ZL(5) shown in FIG.
  • Conditional expression (1) defines an appropriate relationship between the focal length of the variable magnification optical system ZL and the focal length of the final lens group GE in the telephoto end state.
  • conditional expression (1) When the corresponding value of conditional expression (1) exceeds the upper limit, it becomes difficult to correct curvature of field. In addition, since the incident angle of light rays with respect to the image plane (imaging device) increases, it becomes difficult to suppress shading.
  • the upper limit of conditional expression (1) By setting the upper limit of conditional expression (1) to 0.55, 0.50, 0.47, 0.43, and further to 0.40, the effects of this embodiment can be made more reliable. can.
  • conditional expression (1) When the corresponding value of conditional expression (1) is below the lower limit, it becomes difficult to correct curvature of field and coma.
  • the lower limit of conditional expression (1) By setting the lower limit of conditional expression (1) to 0.20, 0.24, 0.27, 0.30, and further to 0.32, the effects of this embodiment can be made more reliable. can.
  • 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 expressions (2) and (3). 2.00 ⁇ TLt/IHw ⁇ 3.00 (2) 1.00 ⁇ (-f1)/fRw ⁇ 1.50 (3)
  • TLt the total length of the variable power optical system ZL in the telephoto end state
  • IHw the maximum image height of the variable power optical system ZL in the wide-angle end state
  • f1 the focal length of the first lens group G1 fRw: the rear group GR 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) or the variable power optical system ZL(5) shown in FIG.
  • Conditional expression (2) defines an appropriate relationship between the total length of the variable power optical system ZL in the telephoto end state and the maximum image height of the variable power optical system ZL in the wide angle end state. By satisfying the conditional expression (2), it is possible to obtain a variable-magnification optical system that is small with respect to the size of the image plane (imaging device).
  • conditional expression (2) If the corresponding value of conditional expression (2) exceeds the upper limit, the total length of the variable power optical system ZL will increase, making it difficult to obtain good optical performance 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 2.90, 2.80, 2.70, 2.65, and further to 2.60, the effects of this embodiment can be made more reliable. can.
  • conditional expression (2) If the corresponding value of conditional expression (2) is below the lower limit, the total length of the variable-magnification optical system ZL is too small, making it difficult to correct coma and curvature of field.
  • the lower limit of conditional expression (2) By setting the lower limit of conditional expression (2) to 2.10, 2.20, 2.30, 2.40, and further to 2.45, the effects of this embodiment can be made more reliable. can.
  • Conditional expression (3) 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. By satisfying the conditional expression (3), it is possible to obtain good optical performance over the entire range of zooming while being compact.
  • conditional expression (3) When the corresponding value of conditional expression (3) exceeds the upper limit, it becomes difficult to correct spherical aberration and coma.
  • the upper limit of conditional expression (3) By setting the upper limit of conditional expression (3) to 1.45, 1.40, 1.36, 1.33, and further to 1.30, the effects of this embodiment can be made more reliable. can.
  • conditional expression (3) When the corresponding value of conditional expression (3) is below the lower limit, it becomes difficult to correct spherical aberration and curvature of field.
  • the lower limit of conditional expression (3) By setting the lower limit of conditional expression (3) to 1.05, 1.10, 1.12, 1.15, and further to 1.18, the effects of this embodiment can be made more reliable. can.
  • At least one lens group of the rear group GR includes a final lens group GE having a positive refractive power and disposed closest to the image side of the rear group GR. . This makes it possible to satisfactorily correct various aberrations.
  • variable power optical system ZL according to the first embodiment may satisfy the conditional expression (2) described above.
  • conditional expression (2) it is possible to obtain a variable-magnification optical system that is small with respect to the size of the image plane (imaging device), as in the second embodiment.
  • the upper limit of the conditional expression (2) to 2.90, 2.80, 2.70, 2.65, and further to 2.60
  • the effect of the first embodiment is made more reliable. can be done.
  • the lower limit of conditional expression (2) to 2.10, 2.20, 2.30, 2.40, and further to 2.45, the effects of the first embodiment can be made more reliable. can do.
  • variable power optical system ZL according to the first embodiment may satisfy the above conditional expression (3).
  • conditional expression (3) it is possible to obtain good optical performance over the entire range of zooming while maintaining a small size, as in the second embodiment.
  • the upper limit of conditional expression (3) to 1.45, 1.40, 1.36, 1.33, and further to 1.30, the effects of the first embodiment can be made more reliable. can be done.
  • the lower limit of conditional expression (3) to 1.05, 1.10, 1.12, 1.15, and further to 1.18, the effects of the first embodiment can be made more reliable. can do.
  • variable power optical system ZL according to the first embodiment and the second embodiment preferably satisfies the following conditional expression (4). 0.30 ⁇ Bfw/IHw ⁇ 0.60 (4)
  • Bfw back focus of the variable power optical system ZL in the wide-angle end state
  • IHw maximum image height of the variable power optical system ZL in the wide-angle end state
  • Conditional expression (4) defines an appropriate relationship between the back focus of the variable power optical system ZL in the wide-angle end state and the maximum image height of the variable power optical system ZL in the wide-angle end state.
  • conditional expression (4) If the corresponding value of conditional expression (4) exceeds the upper limit, the back focus of the variable-magnification optical system ZL is too long, making it difficult to correct curvature of field while reducing the size of the variable-magnification optical system ZL.
  • the upper limit of conditional expression (4) By setting the upper limit of conditional expression (4) to 0.56, 0.53, 0.50, 0.48, and further to 0.46, the effect of each embodiment can be made more reliable. can.
  • conditional expression (4) If the corresponding value of conditional expression (4) is less than the lower limit, the back focus of the variable-magnification optical system ZL is too short and interferes with the camera body, making it unsuitable for practical use.
  • the lower limit of conditional expression (4) By setting the lower limit of conditional expression (4) to 0.32, 0.35, 0.37, 0.40, and further to 0.42, the effect of each embodiment can be made more reliable. can.
  • variable power optical system ZL according to the first embodiment and the second embodiment preferably satisfies the following conditional expression (5). 0.50 ⁇ YLE1/IHw ⁇ 1.00 (5) YLE1: effective radius of the object-side lens surface of the lens closest to the image side of the variable-magnification optical system ZL IHw: maximum image height of the variable-magnification optical system ZL in the wide-angle end state
  • Conditional expression (5) is an appropriate relationship between the effective radius of the object-side lens surface of the lens closest to the image side of the variable-magnification optical system ZL and the maximum image height of the variable-magnification optical system ZL in the wide-angle end state. It defines Hereinafter, the lens arranged closest to the image side of the variable magnification optical system ZL may be referred to as the final lens. By satisfying the conditional expression (5), it is possible to ensure the amount of peripheral light.
  • conditional expression (5) If the corresponding value of conditional expression (5) exceeds the upper limit, the effective radius of the object-side lens surface of the final lens increases, making it difficult to reduce the size of the variable power optical system ZL and to obtain good optical performance. Become.
  • the upper limit of conditional expression (5) By setting the upper limit of conditional expression (5) to 0.95, 0.90, 0.85, 0.82, and further to 0.78, the effect of each embodiment can be made more reliable. can.
  • conditional expression (5) If the corresponding value of conditional expression (5) is below the lower limit, the effective diameter of the object-side lens surface of the final lens becomes small, making it difficult to ensure the amount of peripheral light.
  • the lower limit of conditional expression (5) By setting the lower limit of conditional expression (5) to 0.55, 0.60, 0.65, 0.68, and further to 0.72, the effect of each embodiment can be made more reliable. can.
  • variable power optical system ZL according to the first embodiment and the second embodiment preferably satisfies the following conditional expression (6). 0.80 ⁇ (-f1)/fw ⁇ 1.40 (6) where f1 is the focal length of the first lens group G1 fw is the focal length of the variable magnification optical system ZL in the wide-angle end state
  • Conditional expression (6) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the variable magnification optical system ZL in the wide-angle end state.
  • conditional expression (6) When the corresponding value of conditional expression (6) exceeds the upper limit, the refractive power of the first lens group G1 is too weak, making it difficult to correct various aberrations while reducing the size of the variable magnification optical system ZL.
  • the upper limit of conditional expression (6) By setting the upper limit of conditional expression (6) to 1.35, 1.30, 1.27, 1.24, and further to 1.22, the effect of each embodiment can be made more reliable. can.
  • conditional expression (6) If the corresponding value of conditional expression (6) is below the lower limit, the refracting power of the first lens group G1 is too strong, making it difficult to correct coma.
  • the lower limit of conditional expression (6) By setting the lower limit of conditional expression (6) to 0.85, 0.90, 0.95, 1.00, and further to 1.05, the effect of each embodiment can be made more reliable. can.
  • At least one lens group of the rear group GR is a second lens group having positive refractive power disposed closest to the object side of the rear group GR. It is desirable to include G2 and satisfy the following conditional expression (7). 0.50 ⁇ f2/fw ⁇ 1.00 (7) where f2 is the focal length of the second lens group G2 fw is the focal length of the variable magnification optical system ZL in the wide-angle end state
  • Conditional expression (7) defines an appropriate relationship between the focal length of the second lens group G2 and the focal length of the variable magnification optical system ZL in the wide-angle end state.
  • conditional expression (7) If the corresponding value of conditional expression (7) exceeds the upper limit, the refractive power of the second lens group G2 is too weak, making it difficult to correct various aberrations while reducing the size of the variable magnification optical system ZL.
  • the upper limit of conditional expression (7) By setting the upper limit of conditional expression (7) to 0.95, 0.90, 0.87, and further 0.85, 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 refractive power of the second lens group G2 is too strong, making it difficult to correct spherical aberration.
  • the lower limit of conditional expression (7) By setting the lower limit of conditional expression (7) to 0.55, 0.60, 0.65, 0.70, and further to 0.73, the effect of each embodiment can be made more reliable. can.
  • At least one lens group of the rear group GR is a second lens group having positive refractive power disposed closest to the object side of the rear group GR. It is desirable to include G2 and satisfy the following conditional expression (8). 0.60 ⁇ f2/fRw ⁇ 1.20 (8) where f2: focal length of the second lens group G2 fRw: focal length of the rear group GR in the wide-angle end state
  • Conditional expression (8) defines an appropriate relationship between the focal length of the second lens group G2 and the focal length of the rear group GR in the wide-angle end state.
  • conditional expression (8) exceeds the upper limit, the refractive power of the second lens group G2 is too weak, making it difficult to correct field curvature.
  • the upper limit of conditional expression (8) is 1.15, 1.10, 1.05, 1.00, and further to 0.95, the effect of each embodiment can be made more reliable. can.
  • conditional expression (8) If the corresponding value of conditional expression (8) is below the lower limit, the refractive power of the second lens group G2 is too strong, making it difficult to correct spherical aberration.
  • the lower limit of conditional expression (8) By setting the lower limit of conditional expression (8) to 0.65, 0.70, 0.75, 0.78, and further to 0.82, the effect of each embodiment can be made more reliable. can.
  • variable power optical system ZL preferably satisfies the following conditional expression (9). 1.10 ⁇ ft/fw ⁇ 1.50 (9) where ft is the focal length of the variable-magnification optical system ZL in the telephoto end state, fw is the focal length of the variable-magnification optical system ZL in the wide-angle end state.
  • Conditional expression (9) defines an appropriate range for the variable magnification ratio of the variable magnification optical system ZL. By satisfying conditional expression (9), it is possible to satisfactorily correct various aberrations while maintaining a compact size.
  • conditional expression (9) exceeds the upper limit, the variable power ratio of the variable power optical system ZL increases, making it difficult to correct various aberrations while reducing the size of the variable power optical system ZL.
  • the upper limit of conditional expression (9) to 1.45, 1.40, 1.37, 1.33, and further to 1.30, the effect of each embodiment can be made more reliable. can.
  • conditional expression (9) If the corresponding value of conditional expression (9) is less than the lower limit, the zoom ratio of the zoom optical system ZL is too small, so that it is not useful as a zoom optical system (zoom lens).
  • the lower limit of conditional expression (9) By setting the lower limit of conditional expression (9) to 1.15, 1.18, 1.20, 1.22, and further to 1.25, the effect of each embodiment can be made more reliable. can.
  • variable power optical system ZL preferably satisfies the following conditional expression (10). -1.50 ⁇ (L1r2+L1r1)/(L1r2-L1r1) ⁇ -0.60 (10) where L1r1: the radius of curvature of the object-side lens surface of the lens closest to the object side in the variable power optical system ZL, L1r2: the radius of curvature of the image-side lens surface of the lens closest to the object side curvature radius
  • Conditional expression (10) defines an appropriate range for the shape factor of the lens arranged closest to the object side of the variable magnification optical system ZL. By satisfying the conditional expression (10), field curvature, distortion, spherical aberration, coma, etc. can be favorably corrected in spite of being small.
  • conditional expression (10) When the corresponding value of conditional expression (10) exceeds the upper limit, it becomes difficult to correct curvature of field and distortion.
  • the upper limit of conditional expression (10) By setting the upper limit of conditional expression (10) to ⁇ 0.65, ⁇ 0.70, ⁇ 0.75, and further ⁇ 0.80, the effect of each embodiment can be made more reliable. can.
  • conditional expression (10) When the corresponding value of conditional expression (10) is below the lower limit, it becomes difficult to correct spherical aberration and coma.
  • the lower limit of conditional expression (10) By setting the lower limit of conditional expression (10) to ⁇ 1.45, ⁇ 1.40, ⁇ 1.35, ⁇ 1.30, and further ⁇ 1.25, the effect of each embodiment can be more reliably realized. can be
  • variable power optical system ZL preferably satisfies the following conditional expression (11). ⁇ 0.50 ⁇ (LEr2+LEr1)/(LEr2 ⁇ LEr1) ⁇ 0.60 (11) where LEr1: the radius of curvature of the object-side lens surface of the lens closest to the image side in the variable-magnification optical system ZL, LEr2: the radius of curvature of the image-side lens surface of the lens closest to the image side of the variable-magnification optical system ZL. curvature radius
  • Conditional expression (11) defines an appropriate range for the shape factor of the lens (final lens) arranged closest to the image side of the variable magnification optical system ZL. By satisfying conditional expression (11), coma aberration and curvature of field can be favorably corrected while being compact.
  • conditional expression (11) When the corresponding value of conditional expression (11) exceeds the upper limit, it becomes difficult to correct coma.
  • the upper limit of conditional expression (11) By setting the upper limit of conditional expression (11) to 0.55, 0.50, 0.45, 0.40, and further to 0.38, the effect of each embodiment can be made more reliable. can.
  • conditional expression (11) When the corresponding value of conditional expression (11) falls below the lower limit, it becomes difficult to correct field curvature.
  • the lower limit of conditional expression (11) By setting the lower limit of conditional expression (11) to ⁇ 0.45, ⁇ 0.40, ⁇ 0.35, ⁇ 0.30, and further ⁇ 0.25, the effects of each embodiment can be more reliably realized. can be
  • variable power optical system ZL preferably has a diaphragm arranged between the first lens group G1 and the rear group GR. This makes it possible to suppress shading.
  • variable power optical system ZL according to the first embodiment and the second embodiment preferably satisfies the following conditional expression (12). 88.00° ⁇ 2 ⁇ w (12) where 2 ⁇ w: the total angle of view of the variable magnification optical system ZL in the wide-angle end state
  • Conditional expression (12) defines an appropriate range for the total angle of view of the variable magnification optical system ZL in the wide-angle end state. Satisfying conditional expression (12) is preferable because a variable power optical system with a wide angle of view can be obtained.
  • the lower limit of conditional expression (12) By setting the lower limit of conditional expression (12) to 90.00°, 92.00°, 94.00°, 96.00°, and further 98.00°, the effect of each embodiment can be obtained more reliably.
  • the upper limit of conditional expression (12) By setting the upper limit of conditional expression (12) to 114.00°, 110.00°, 107.00°, 104.00°, and further 102.00°, the effect of each embodiment can be more reliably achieved. can be
  • variable power optical system ZL preferably satisfies the following conditional expression (13). 0.01 ⁇ D1/TLw ⁇ 0.20 (13) where D1: the thickness of the first lens group G1 on the optical axis TLw: the total length of the variable magnification optical system ZL in the wide-angle end state
  • Conditional expression (13) defines an appropriate relationship between the thickness of the first lens group G1 on the optical axis and the total length of the variable magnification optical system ZL in the wide-angle end state.
  • conditional expression (13) When the corresponding value of conditional expression (13) exceeds the upper limit, it becomes difficult to correct various aberrations such as curvature of field and spherical aberration while maintaining compactness.
  • the upper limit of conditional expression (13) By setting the upper limit of conditional expression (13) to 0.19, 0.18, and further 0.17, the effect of each embodiment can be made more reliable.
  • conditional expression (13) When the corresponding value of conditional expression (13) is below the lower limit, it becomes difficult to correct various aberrations such as curvature of field and spherical aberration.
  • the lower limit of conditional expression (13) By setting the lower limit of conditional expression (13) to 0.03, 0.05, and further 0.10, the effect of each embodiment can be made more reliable.
  • variable power optical system ZL according to the first embodiment and the second embodiment preferably satisfies the following conditional expression (14). 0.10 ⁇ Bfw/fw ⁇ 0.60 (14) where Bfw: back focus of the variable-magnification optical system ZL in the wide-angle end state fw: focal length of the variable-magnification optical system ZL in the wide-angle end state
  • Conditional expression (14) defines the relationship between the back focus and the focal length of the variable power optical system ZL in the wide-angle end state.
  • the upper limit of conditional expression (14) is 0.58, 0.55, 0.53, and further 0.50, the effect of each embodiment can be made more reliable.
  • the lower limit of conditional expression (14) is 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, and further to 0.45, The effect can be made more reliable.
  • 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).
  • the final lens group GE having positive refractive power is arranged closest to the image side of the rear group GR (step ST3).
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expression (1) (step ST4).
  • 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 ST11).
  • it is configured so that the distance between adjacent lens groups changes during zooming (step ST12).
  • each lens is arranged in the lens barrel so as to satisfy at least the conditional expressions (2) and (3) (step ST13). 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.
  • variable-magnification optical system ZL according to the example of each embodiment will be described based on the drawings.
  • 1, 3, 5, 7, and 9 are cross-sections showing configurations and refractive power distributions of variable magnification optical systems ZL ⁇ ZL(1) to ZL(5) ⁇ according to first to fifth examples. It is a diagram.
  • the direction of movement of the focusing group along the optical axis when focusing on a short distance object from infinity is shown as It is indicated by an arrow together with the word "focus".
  • W wide-angle end state
  • T telephoto end state
  • each lens group is represented by a combination of symbol G and a number, and each lens is represented by a combination of symbol L and a number.
  • the lens groups and the like are represented independently using combinations of symbols and numerals for each embodiment. Therefore, even if the same reference numerals and symbols are used between the embodiments, it does not mean that they have the same configuration.
  • Tables 1 to 5 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. It is a table
  • f is the focal length of the entire lens system
  • FNO is the F number
  • 2 ⁇ is the angle of view (unit is ° (degrees)
  • ⁇ is the half angle of view
  • Ymax is the maximum image height.
  • TL indicates the distance obtained by adding BF to the distance from the foremost lens surface to the last lens surface on the optical axis when focusing on infinity
  • BF is the distance from the last lens surface on the optical axis when focusing on infinity.
  • the distance to plane I (back focus) is shown. Note that these values are shown for each of the zooming states of the wide-angle end (W) and the telephoto end (T).
  • IHw indicates the maximum image height of the variable magnification optical system in the wide-angle end state.
  • YLE1 indicates the effective radius of the object-side lens surface of the lens (last lens) arranged closest to the image side of the variable-magnification optical system.
  • fRw represents the focal length of the rear group in the wide-angle end state.
  • D1 represents the thickness of the first lens group on the optical axis.
  • 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 Abbe's number based on the d-line of the material of the member
  • ED indicate the effective diameter (effective diameter) of each optical surface.
  • the radius of curvature “ ⁇ ” indicates a plane or an aperture, and (diaphragm S) indicates an aperture diaphragm S, respectively.
  • the description of the refractive index of air nd 1.00000 is omitted.
  • the optical surface is an aspherical surface, the surface number is marked with *, and the column of curvature radius R indicates the paraxial curvature radius.
  • 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, the surface spacing in the intermediate distance 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 negative refractive power, and a fourth lens group G4 having positive refractive power.
  • W wide-angle end state
  • T telephoto end state
  • 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.
  • each mating lens group changes.
  • the aperture stop S moves along the optical axis together with the second lens group G2, and the position of the first lens group G1 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 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 biconvex positive lens L21, a positive meniscus lens L22 with a convex surface facing the object side, 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 L22 has aspherical lens surfaces on both sides.
  • the negative meniscus lens L24 has an aspheric lens surface on the image side.
  • 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 biconvex positive lens L41.
  • An image plane I is arranged on the image side of the fourth lens group G4.
  • 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 lens L41 of the fourth lens group G4 corresponds to the final lens.
  • the third lens group G3 moves along the optical axis toward the image side.
  • Table 1 lists the values of the specifications of the variable power optical system according to the first example. Note that the fifth surface is a virtual surface.
  • 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 negative refractive power, and a fourth lens group G4 having positive refractive power.
  • 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.
  • the spacing between each mating lens group changes.
  • the aperture stop S moves along the optical axis together with the second lens group G2, and the position of the first lens group G1 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 is a hybrid type lens that is configured by providing a resin layer on the image side surface of a glass lens body.
  • the image-side surface of the resin layer is aspherical
  • the negative lens L11 is a compound aspherical lens.
  • surface number 1 is the object side surface of the lens body
  • surface number 2 is the image side surface of the lens body and the object side surface of the resin layer (surface where both are joined)
  • surface number 3 indicates the image-side surface of the resin layer.
  • the second lens group G2 includes a biconvex positive lens L21, a positive meniscus lens L22 with a convex surface facing the object side, 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 L22 has aspherical lens surfaces on both sides.
  • the negative meniscus lens L24 has an aspheric lens surface on the image side.
  • 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 biconvex positive lens L41.
  • An image plane I is arranged on the image side of the fourth lens group G4.
  • 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 lens L41 of the fourth lens group G4 corresponds to the final lens.
  • the third lens group G3 moves along the optical axis toward the image side.
  • Table 2 lists the values of the specifications of the variable power optical system according to the second example. Note that the sixth surface is a virtual surface.
  • 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, and a fourth lens group G4 having positive refractive power.
  • 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.
  • the spacing between each mating lens group changes.
  • the aperture stop S moves along the optical axis together with the second lens group G2, and the position of the first lens group G1 is fixed with respect to the image plane I.
  • the first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a negative meniscus lens L12 having a convex surface facing the object side, which are arranged in order from the object side along the optical axis. and a cemented lens with the positive meniscus lens L13. Both lens surfaces of the negative meniscus lens L11 are aspheric.
  • the second lens group G2 includes a positive meniscus lens L21 with a convex surface facing the object side, a positive meniscus lens L22 with a convex surface facing the object side, and a biconvex positive meniscus lens L22, 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 negative meniscus lens L24 has an aspheric lens surface on the image side.
  • 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 biconvex positive lens L41.
  • An image plane I is arranged on the image side of the fourth lens group G4.
  • 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 lens L41 of the fourth lens group G4 corresponds to the final lens.
  • the third lens group G3 moves along the optical axis toward the image side.
  • Table 3 lists the values of the specifications of the variable power optical system according to the third example. Note that the sixth surface is a virtual surface.
  • 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. and a third lens group G3 having positive refractive power.
  • W wide-angle end state
  • T telephoto end state
  • 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.
  • the first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a negative meniscus lens L12 having a convex surface facing the object side, which are arranged in order from the object side along the optical axis. and a cemented lens with the positive meniscus lens L13. Both lens surfaces of the negative meniscus lens L11 are aspheric.
  • 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 with a convex surface facing the object side, arranged in order from the object side along the optical axis.
  • a negative meniscus lens L27 The positive meniscus lens L26 has aspheric lens surfaces on both sides. Both lens surfaces of the negative meniscus lens L27 are aspheric.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • An image plane I is arranged on the image side of the third lens group G3.
  • the second lens group G2 and the third lens group G3 constitute a rear group GR having positive refractive power as a whole.
  • the third lens group G3 corresponds to the final lens group GE arranged closest to the image side of the rear group GR.
  • the positive lens L31 of the third lens group G3 corresponds to the final lens.
  • 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, and a fourth lens group G4 having positive refractive power.
  • the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 move along the optical axis to 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.
  • the first lens group G1 is composed of a biconcave negative lens L11 and a positive meniscus lens L12 having a convex surface facing the object side, which are arranged in order from the object side along the optical axis.
  • the negative lens L11 is a hybrid lens formed by providing a resin layer on the image-side surface of a lens body made of glass.
  • the image-side surface of the resin layer is aspherical
  • the negative lens L11 is a compound aspherical lens.
  • surface number 1 is the object side surface of the lens body
  • surface number 2 is the image side surface of the lens body and the object side surface of the resin layer (surface where both are joined)
  • surface number 3 indicates the image-side surface of the resin layer.
  • the second lens group G2 includes a biconvex positive lens L21, a positive meniscus lens L22 with a convex surface facing the object side, 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 L22 has aspherical lens surfaces on both sides.
  • the negative meniscus lens L24 has an aspheric lens surface on the image side.
  • 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 biconvex positive lens L41.
  • An image plane I is arranged on the image side of the fourth lens group G4.
  • 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 lens L41 of the fourth lens group G4 corresponds to the final lens.
  • the third lens group G3 moves along the optical axis toward the image side.
  • Table 5 lists the values of the specifications of the variable power optical system according to the fifth example. Note that the sixth surface is a virtual surface.
  • 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.
  • Conditional expression (1) 0.15 ⁇ ft/fGE ⁇ 0.60
  • Conditional expression (2) 2.00 ⁇ TLt/IHw ⁇ 3.00
  • Conditional expression (3) 1.00 ⁇ (-f1)/fRw ⁇ 1.50
  • Conditional expression (4) 0.30 ⁇ Bfw/IHw ⁇ 0.60
  • Conditional expression (5) 0.50 ⁇ YLE1/IHw ⁇ 1.00
  • Conditional expression (6) 0.80 ⁇ (-f1)/fw ⁇ 1.40
  • Conditional expression (7) 0.50 ⁇ f2/fw ⁇ 1.00
  • Conditional expression (8) 0.60 ⁇ f2/fRw ⁇ 1.20
  • Conditional expression (9) 1.10 ⁇ ft/fw ⁇ 1.50
  • Conditional expression (10) -1.50 ⁇ (L1r2+L1r1)/(L1r2-L1r1) ⁇ -0.60
  • Conditional expression (11) ⁇ 0.50 ⁇ (LEr2+LEr1)/(LEr2 ⁇ LEr1)/(LEr2 ⁇ LEr
  • Conditional expression 1st embodiment 2nd embodiment 3rd embodiment (1) 0.336 0.327 0.373 (2) 2.519 2.508 2.543 (3) 1.201 1.263 1.222 (4) 0.442 0.436 0.444 (5) 0.759 0.755 0.740 (6) 1.118 1.200 1.102 (7) 0.812 0.837 0.767 (8) 0.872 0.881 0.850 (9) 1.272 1.272 1.272 (10) -0.962 -0.863 -1.117 (11) -0.186 -0.193 0.113 (12) 100.18 98.96 100.44 (13) 0.127 0.073 0.161 (14) 0.472 0.466 0.470 [Conditional Expression Corresponding Value] (Fourth and Fifth Examples) Conditional expression 4th embodiment 5th embodiment (1) 0.394 0.320 (2) 2.520 2.569 (3) 1.272 1.227 (4) 0.439 0.437 (5) 0.754 0.757 (6) 1.133 1.145 (7) 0.819 0.831 (8) 0.919
  • variable power optical system of the present embodiment Although three-group and four-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, five groups, six groups, etc.) can be used for variable magnification.
  • 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.
  • 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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JP2024076793A (ja) * 2022-11-25 2024-06-06 キヤノン株式会社 ズームレンズ、およびそれを有する撮像装置、撮像システム

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