WO2024122598A1 - 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
WO2024122598A1
WO2024122598A1 PCT/JP2023/043740 JP2023043740W WO2024122598A1 WO 2024122598 A1 WO2024122598 A1 WO 2024122598A1 JP 2023043740 W JP2023043740 W JP 2023043740W WO 2024122598 A1 WO2024122598 A1 WO 2024122598A1
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Prior art keywords
lens group
optical system
variable magnification
lens
magnification optical
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English (en)
French (fr)
Japanese (ja)
Inventor
知之 幸島
京也 徳永
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Nikon Corp
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Nikon Corp
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Priority to CN202380090953.9A priority Critical patent/CN120604156A/zh
Priority to JP2024562981A priority patent/JPWO2024122598A1/ja
Publication of WO2024122598A1 publication Critical patent/WO2024122598A1/ja
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    • 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
    • G02B15/16—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 magnification optical systems suitable for photo cameras, electronic still cameras, video cameras, etc. have been proposed in the past (see, for example, Patent Document 1). With such variable magnification optical systems, it is difficult to achieve a small size while also achieving bright and good optical performance.
  • a first variable magnification optical system comprises, arranged in order from the object side along the optical axis, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a rear group having at least five lens groups, wherein the spacing between adjacent lens groups changes during magnification variation, the first lens group is fixed with respect to the image plane, and the following conditional expression is satisfied: 0.05 ⁇ (-f2)/f1 ⁇ 1.00 0.02 ⁇ Bft/ft ⁇ 0.15 where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, ft is the focal length of the variable magnification optical system in the telephoto end state, and Bft is the back focus of the variable magnification optical system in the telephoto end state.
  • a second variable magnification optical system comprises, arranged in order from the object side along the optical axis, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a rear group having at least five lens groups, wherein, during magnification change, the spacing between adjacent lens groups changes, the first lens group is fixed with respect to the image plane, and the at least five lens groups of the rear group include a first focusing lens group having negative refractive power and a second focusing lens group having positive refractive power arranged on the image plane side of the first focusing lens group, and, during focusing, the first focusing lens group and the second focusing lens group move along the optical axis on different trajectories, and the following conditional expression is satisfied: 0.10 ⁇ (-fF1)/fF2 ⁇ 1.30 0.01 ⁇ Bfw/fw ⁇ 0.50 where fF1 is the focal length of the first focusing lens group, fF2 is the
  • the optical device according to the present invention is configured with the variable magnification optical system described above.
  • a first manufacturing method of a variable magnification optical system is a manufacturing method of a variable magnification optical system consisting of, arranged in order from the object side along the optical axis, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a rear group having at least five lens groups, and includes a step of arranging each lens within the lens barrel so that, during magnification variation, the spacing between adjacent lens groups changes, the first lens group is fixed with respect to the image plane, and the following conditional expression is satisfied: 0.05 ⁇ (-f2)/f1 ⁇ 1.00 0.02 ⁇ Bft/ft ⁇ 0.15 where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, ft is the focal length of the variable magnification optical system in the telephoto end state, and Bft is the back focus of the variable magnification optical system in the telephoto end state.
  • a second manufacturing method of a variable magnification optical system is a manufacturing method of a variable magnification optical system consisting of a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a rear group having at least five lens groups, arranged in order from the object side along the optical axis, wherein the spacing between adjacent lens groups changes during magnification, the first lens group is fixed with respect to an image plane, and the at least five lens groups of the rear group include a first focusing lens group having negative refractive power and a second focusing lens group having positive refractive power arranged on the image plane side of the first focusing lens group, and the manufacturing method includes a step of arranging each lens within the lens barrel so that, during focusing, the first focusing lens group and the second focusing lens group move along the optical axis on different trajectories and the following conditional expression is satisfied: 0.10 ⁇ (-fF1)/fF2 ⁇ 1.30 0.
  • FIG. 2 is a diagram showing a lens configuration of a variable magnification optical system according to a first example.
  • 5A to 5C are diagrams illustrating various aberrations of the variable magnification optical system according to Example 1 when focused on an object at infinity in the wide-angle end state.
  • 5A to 5C are diagrams illustrating various aberrations occurring when the variable magnification optical system according to Example 1 is in the telephoto end state and focused on an object at infinity.
  • FIG. 13 is a diagram showing a lens configuration of a variable magnification optical system according to Example 2.
  • 13A to 13C are diagrams illustrating various aberrations when the variable magnification optical system according to Example 2 is in the wide-angle end state and focused on an object at infinity.
  • FIG. 13A to 13C are diagrams illustrating various aberrations occurring when the variable magnification optical system according to Example 2 is in the telephoto end state and focused on an object at infinity.
  • FIG. 13 is a diagram showing a lens configuration of a variable magnification optical system according to a third example.
  • 13A to 13C are diagrams illustrating various aberrations occurring when the variable magnification optical system according to Example 3 is in the wide-angle end state and focused on an object at infinity.
  • 13A to 13C are diagrams illustrating various aberrations occurring when the variable magnification optical system according to Example 3 is in the telephoto end state and focused on an object at infinity.
  • FIG. 1 is a diagram showing the configuration of a camera equipped with a variable magnification optical system according to each embodiment. 4 is a flowchart showing a method for manufacturing the variable magnification optical system according to the first embodiment.
  • 10 is a flowchart showing a method for manufacturing a variable magnification optical system according to a second embodiment
  • this camera 1 is composed of a body 2 and a photographing lens 3 attached to the body 2.
  • the body 2 is equipped with an image sensor 4, a body control unit (not shown) that controls the operation of the digital camera, and an LCD screen 5.
  • the photographing lens 3 is equipped with a variable magnification optical system ZL consisting of multiple lens groups, and a lens position control mechanism (not shown) that controls the position of each lens group.
  • the lens position control mechanism is composed of a sensor that detects the position of the lens groups, a motor that moves the lens groups back and forth along the optical axis, and a control circuit that drives the motor.
  • variable magnification optical system ZL of the photographing lens 3 Light from the subject is collected by the variable magnification optical system ZL of the photographing lens 3 and reaches the image plane I of the image sensor 4.
  • the light from the subject that reaches the image plane I is photoelectrically converted by the image sensor 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 LCD screen 5 in response to a user's operation.
  • this camera may be either a mirrorless camera or a single-lens reflex camera with a quick-return mirror.
  • the variable magnification optical system ZL shown in Figure 10 is a schematic representation of the variable magnification optical system provided in the photographing lens 3, and the lens configuration of the variable magnification optical system ZL is not limited to this configuration.
  • variable magnification optical system ZL(1) which is an example of the variable magnification optical system (zoom lens) ZL according to the first embodiment, is composed of, arranged in order from the object side along the optical axis, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a rear group GR having at least five lens groups, as shown in FIG. 1.
  • the spacing between adjacent lens groups changes, and the first lens group G1 is fixed relative to the image plane I.
  • variable magnification optical system ZL satisfies the following conditional expressions (1) and (2). 0.05 ⁇ ( ⁇ f2)/f1 ⁇ 1.00 (1) 0.02 ⁇ Bft/ft ⁇ 0.15 ... (2) where f1 is the focal length of the first lens group G1, f2 is the focal length of the second lens group G2, ft is the focal length of the variable magnification optical system ZL in the telephoto end state, and Bft is the back focus 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. 4, or the variable magnification optical system ZL(3) shown in FIG. 7.
  • Conditional formula (1) defines the appropriate relationship between the focal length of the second lens group G2 and the focal length of the first lens group G1. By satisfying conditional formula (1), spherical aberration, coma, and field curvature can be corrected satisfactorily.
  • conditional formula (1) If the corresponding value of conditional formula (1) exceeds the upper limit, the refractive power of the first lens group G1 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the first lens group G1.
  • the upper limit of conditional formula (1) By setting the upper limit of conditional formula (1) to 0.80, 0.70, 0.50, 0.40, or even 0.37, the effect of the first embodiment can be made more certain.
  • conditional formula (1) falls below the lower limit, the refractive power of the second lens group G2 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the second lens group G2.
  • the lower limit of conditional formula (1) 0.10, 0.15, 0.20, 0.25, or even 0.30, the effect of the first embodiment can be made more certain.
  • Conditional formula (2) specifies the appropriate relationship between the back focus of the variable magnification optical system ZL in the telephoto end state and the focal length of the variable magnification optical system ZL in the telephoto end state. By satisfying conditional formula (2), it is possible to obtain a variable magnification optical system that is small, yet bright and has good optical performance. By setting the upper limit of conditional formula (2) to 0.12, or even 0.10, the effect of the first embodiment can be made more certain. Furthermore, by setting the lower limit of conditional formula (2) to 0.02, 0.04, or even 0.05, the effect of the first embodiment can be made more certain.
  • variable magnification optical system ZL according to the second embodiment has the same configuration as the variable magnification optical system ZL according to the first embodiment, and therefore will be described with the same reference numerals as in the first embodiment.
  • the variable magnification optical system ZL(1) as an example of the variable magnification optical system (zoom lens) ZL according to the second embodiment is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a rear group GR having at least five lens groups, arranged in order from the object side along the optical axis, as shown in FIG. 1.
  • the at least five lens groups of the rear group GR include a first focusing lens group GF1 having a negative refractive power, and a second focusing lens group GF2 having a positive refractive power arranged closer to the image surface than the first focusing lens group GF1.
  • the first focusing lens group GF1 and the second focusing lens group GF2 move along the optical axis on different trajectories.
  • the lens groups that move during focusing in the wide-angle end state may be referred to as the first focusing lens group GF1, the second focusing lens group GF2, ... in order from the object side.
  • variable-magnification optical system ZL satisfies the following conditional expressions (3) and (4). 0.10 ⁇ ( ⁇ fF1)/fF2 ⁇ 1.30 (3) 0.01 ⁇ Bfw/fw ⁇ 0.50 ... (4) where fF1 is the focal length of the first focusing lens group GF1, fF2 is the focal length of the second focusing lens group GF2, fw is the focal length of the variable magnification optical system ZL in the wide-angle end state, and Bfw is the back focus of the variable magnification optical system ZL in the wide-angle end state.
  • variable magnification optical system ZL may be the variable magnification optical system ZL(2) shown in FIG. 4, or the variable magnification optical system ZL(3) shown in FIG. 7.
  • Conditional formula (3) defines the appropriate relationship between the focal length of the first focusing lens group GF1 and the focal length of the second focusing lens group GF2. By satisfying conditional formula (3), spherical aberration can be effectively corrected.
  • conditional expression (3) If the corresponding value of conditional expression (3) exceeds the upper limit, the refractive power of the second focusing lens group GF2 becomes strong, making it difficult to correct the spherical aberration and coma aberration that occur during focusing.
  • the upper limit of conditional expression (3) By setting the upper limit of conditional expression (3) to 1.20, 1.10, 1.00, 0.90, or even 0.80, the effect of the second embodiment can be made more certain.
  • conditional expression (3) If the corresponding value of conditional expression (3) falls below the lower limit, the refractive power of the first focusing lens group GF1 becomes strong, making it difficult to correct the spherical aberration that occurs during focusing.
  • the lower limit of conditional expression (3) By setting the lower limit of conditional expression (3) to 0.15, 0.20, 0.25, 0.35, 0.45, or even 0.50, the effect of the second embodiment can be made more certain.
  • Conditional formula (4) specifies the appropriate relationship between the back focus of the variable magnification optical system ZL in the wide-angle end state and the focal length of the variable magnification optical system ZL in the wide-angle end state.
  • conditional formula (4) it is possible to obtain a variable magnification optical system that is small, yet bright and has good optical performance.
  • the upper limit of conditional formula (4) 0.45, 0.40, 0.35, 0.33, 0.30, or even 0.28
  • the effect of the second embodiment can be made more certain.
  • the lower limit of conditional formula (4) to 0.05, 0.10, or even 0.13, the effect of the second embodiment can be made more certain.
  • variable magnification optical system ZL according to the first embodiment may satisfy the above-mentioned conditional expression (4).
  • conditional expression (4) it is possible to obtain a variable magnification optical system that is small yet bright and has good optical performance, as in the second embodiment.
  • the upper limit value of conditional expression (4) 0.45, 0.40, 0.35, 0.33, 0.30, or even 0.28
  • the effect of the first embodiment can be made more certain.
  • the lower limit value of conditional expression (4) to 0.05, 0.10, or even 0.13, the effect of the first embodiment can be made more certain.
  • the at least five lens groups of the rear group GR include a first focusing lens group GF1 having a negative refractive power and a second focusing lens group GF2 having a positive refractive power arranged closer to the image surface than the first focusing lens group GF1, and during focusing, the first focusing lens group GF1 and the second focusing lens group GF2 may move along the optical axis on different trajectories.
  • the variable magnification optical system ZL according to the first embodiment may also satisfy the above-mentioned conditional expression (3). By satisfying conditional expression (3), spherical aberration can be corrected well, as in the second embodiment.
  • conditional expression (3) By setting the upper limit value of conditional expression (3) to 1.20, 1.10, 1.00, 0.90, or even 0.80, the effect of the first embodiment can be made more certain. By setting the lower limit value of conditional expression (3) to 0.15, 0.20, 0.25, 0.35, 0.45, or even 0.50, the effect of the first embodiment can be made more certain.
  • variable magnification optical system ZL may satisfy the following conditional expression (5). 0.50 ⁇ f2/fF1 ⁇ 1.00 ... (5) where f2 is the focal length of the second lens group G2
  • Conditional formula (5) defines the appropriate relationship between the focal length of the second lens group G2 and the focal length of the second focusing lens group GF2. By satisfying conditional formula (5), spherical aberration can be effectively corrected.
  • conditional expression (5) If the corresponding value of conditional expression (5) exceeds the upper limit, the refractive power of the first focusing lens group GF1 becomes strong, making it difficult to correct the spherical aberration that occurs during focusing.
  • the upper limit of conditional expression (5) By setting the upper limit of conditional expression (5) to 0.95, or even 0.90, the effects of each embodiment can be made more certain.
  • conditional expression (5) falls below the lower limit, the refractive power of the second lens group G2 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the second lens group G2.
  • the lower limit of conditional expression (5) 0.60, 0.65, or even 0.70, the effects of each embodiment can be made more certain.
  • variable magnification optical system ZL may satisfy the following conditional expression (6). 1.20 ⁇ f1/fF2 ⁇ 2.00 ... (6) where f1 is the focal length of the first lens group G1
  • Conditional formula (6) defines the appropriate relationship between the focal length of the first lens group G1 and the focal length of the second focusing lens group GF2. By satisfying conditional formula (6), spherical aberration and coma aberration can be effectively corrected.
  • conditional expression (6) If the corresponding value of conditional expression (6) exceeds the upper limit, the refractive power of the second focusing lens group GF2 becomes strong, making it difficult to correct the spherical aberration and coma aberration that occur during focusing.
  • the upper limit of conditional expression (6) By setting the upper limit of conditional expression (6) to 1.90, or even 1.85, the effects of each embodiment can be made more certain.
  • conditional expression (6) falls below the lower limit, the refractive power of the first lens group G1 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the first lens group G1.
  • the lower limit of conditional expression (6) is 1.25, 1.30, or even 1.35, the effects of each embodiment can be made more certain.
  • variable magnification optical system ZL may satisfy the following conditional expression (7). 0.50 ⁇ f3/fF2 ⁇ 1.00 ... (7) where f3 is the focal length of the third lens group G3.
  • Conditional formula (7) defines the appropriate relationship between the focal length of the third lens group G3 and the focal length of the second focusing lens group GF2. By satisfying conditional formula (7), spherical aberration and coma aberration can be effectively corrected.
  • conditional expression (7) If the corresponding value of conditional expression (7) exceeds the upper limit, the refractive power of the second focusing lens group GF2 becomes strong, making it difficult to correct the spherical aberration and coma aberration that occur during focusing.
  • the upper limit of conditional expression (7) By setting the upper limit of conditional expression (7) to 0.95, or even 0.90, the effects of each embodiment can be made more certain.
  • conditional expression (7) falls below the lower limit, the refractive power of the third lens group G3 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the third lens group G3.
  • the lower limit of conditional expression (7) 0.60, 0.65, or even 0.70, the effects of each embodiment can be made more certain.
  • the second focusing lens group GF2 may be composed of one lens component. This allows the variable magnification optical system to be made small and lightweight.
  • the lens component refers to a single lens or a cemented lens.
  • the second focusing lens group GF2 may be composed of one positive lens.
  • the second focusing lens group GF2 may be composed of one cemented positive lens.
  • variable magnification optical system ZL may satisfy the following conditional expression (8). 2.00 ⁇ TLw/fw ⁇ 6.00 ... (8) where fw is the focal length of the variable magnification optical system ZL in the wide-angle end state, and TLw is the total length of the variable magnification optical system ZL in the wide-angle end state.
  • Conditional formula (8) specifies the appropriate relationship between the overall length of the variable magnification optical system ZL in the wide-angle end state and the focal length of the variable magnification optical system ZL in the wide-angle end state.
  • conditional formula (8) it is possible to obtain a variable magnification optical system that is small, yet bright and has good optical performance.
  • the upper limit of conditional formula (8) to 5.50, 5.00, 4.50, or even 4.00, the effects of each embodiment can be made more certain.
  • the lower limit of conditional formula (8) to 2.50, 2.80, 3.00, or even 3.10, the effects of each embodiment can be made more certain.
  • variable magnification optical system ZL may satisfy the following conditional expression (9). 0.01 ⁇ ( ⁇ f2)/f3 ⁇ 2.00 ... (9) where f2 is the focal length of the second lens group G2, and f3 is the focal length of the third lens group G3.
  • Conditional formula (9) defines the appropriate relationship between the focal length of the second lens group G2 and the focal length of the third lens group G3. By satisfying conditional formula (9), spherical aberration, coma, and field curvature can be corrected satisfactorily.
  • conditional expression (9) exceeds the upper limit, the refractive power of the third lens group G3 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the third lens group G3.
  • the upper limit of conditional expression (9) is 1.80, 1.60, 1.50, 1.35, 1.10, or even 1.00, the effect of this embodiment can be made more certain.
  • conditional expression (9) falls below the lower limit, the refractive power of the second lens group G2 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the second lens group G2.
  • the lower limit of conditional expression (9) is 0.10, 0.20, 0.30, 0.35, 0.45, 0.50, or even 0.55, the effect of this embodiment can be made more certain.
  • variable magnification optical system ZL may satisfy the following conditional expression (10). 1.80 ⁇ f1/f3 ⁇ 2.50 ... (10) where f1 is the focal length of the first lens group G1, and f3 is the focal length of the third lens group G3.
  • Conditional formula (10) defines the appropriate relationship between the focal length of the first lens group G1 and the focal length of the third lens group G3. By satisfying conditional formula (10), spherical aberration, coma, and field curvature can be effectively corrected.
  • conditional expression (10) exceeds the upper limit, the refractive power of the third lens group G3 becomes strong, making it difficult to correct the spherical aberration, coma, and field curvature that occur in the third lens group G3.
  • the upper limit of conditional expression (10) is 2.45, 2.40, or even 2.35, the effect of this embodiment can be made more certain.
  • conditional expression (10) falls below the lower limit, the refractive power of the first lens group G1 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the first lens group G1.
  • the lower limit of conditional expression (10) is 1.85, or even 1.90, the effect of this embodiment can be made more certain.
  • the at least five lens groups of the rear group GR include a final lens group GE arranged closest to the image surface, and may satisfy the following conditional expression (11): 0.01 ⁇
  • Conditional formula (11) specifies the appropriate relationship between the focal length of the lens group arranged next to the final lens group GE on the object side in the rear group GR, and the focal length of the final lens group GE. By satisfying conditional formula (11), it is possible to satisfactorily correct the curvature of field.
  • conditional expression (11) exceeds the upper limit, the refractive power of the final lens group GE becomes strong, making it difficult to correct the field curvature that occurs in the final lens group GE.
  • the upper limit of conditional expression (11) to 4.80, 4.50, 4.30, 3.50, 3.30, 3.00, 2.80, or even 2.50, the effect of this embodiment can be made more certain.
  • conditional expression (11) falls below the lower limit, the refractive power of the lens group arranged next to the object side of the final lens group GE in the rear group GR becomes strong, making it difficult to correct the coma aberration and field curvature that occur in the lens group arranged next to the object side of the final lens group GE.
  • the effect of this embodiment can be made more certain by setting the lower limit of conditional expression (11) to 0.10, 0.20, 0.25, 0.35, 0.45, or even 0.50.
  • the at least five lens groups of the rear group GR include a final lens group GE arranged closest to the image plane, and may satisfy the following conditional expression (12): 0.10 ⁇ f2/fr1 ⁇ 0.75 ... (12) where f2 is the focal length of the second lens group G2, and fr1 is the focal length of the lens group arranged next to the object side of the final lens group GE in the rear group GR.
  • Conditional formula (12) specifies the appropriate relationship between the focal length of the second lens group G2 and the focal length of the lens group arranged next to the object side of the final lens group GE in the rear group GR. By satisfying conditional formula (12), coma aberration and curvature of field can be corrected satisfactorily.
  • conditional expression (12) exceeds the upper limit, the refractive power of the lens group arranged next to the object side of the final lens group GE in the rear group GR becomes strong, making it difficult to correct the coma aberration and field curvature that occur in the lens group arranged next to the object side of the final lens group GE.
  • the upper limit of conditional expression (12) By setting the upper limit of conditional expression (12) to 0.70, or even 0.68, the effect of this embodiment can be made more certain.
  • conditional expression (12) falls below the lower limit, the refractive power of the second lens group G2 becomes strong, making it difficult to correct the spherical aberration, coma aberration, and field curvature that occur in the second lens group G2.
  • the lower limit of conditional expression (12) By setting the lower limit of conditional expression (12) to 0.15, or even 0.20, the effect of this embodiment can be made more certain.
  • the at least five lens groups in the rear group GR include a final lens group GE arranged closest to the image surface, and the final lens group GE may be fixed relative to the image surface I during magnification change. This allows the variable magnification optical system to be made compact.
  • the at least five lens groups in the rear group GR include a final lens group GE arranged closest to the image surface, and the final lens group GE may be composed of a negative lens and a positive lens arranged in order from the object side along the optical axis. This allows for good correction of chromatic aberration.
  • a manufacturing method of the variable magnification optical system ZL according to the first embodiment will be outlined.
  • a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a rear group GR are arranged in order from the object side along the optical axis (step ST1).
  • at least five lens groups are arranged in the rear group GR.
  • the arrangement is such that the interval between adjacent lens groups changes during magnification change, and the first lens group G1 is fixed relative to the image surface I (step ST2).
  • each lens is arranged in the lens barrel so as to satisfy at least the above conditional expressions (1) and (2) (step ST3). According to this manufacturing method, it is possible to manufacture a variable magnification optical system that is small, yet bright and has good optical performance.
  • a manufacturing method of the variable magnification optical system ZL according to the second embodiment will be outlined.
  • a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a rear group GR are arranged in order from the object side along the optical axis (step ST11).
  • at least five lens groups are arranged in the rear group GR, including a first focusing lens group GF1 having a negative refractive power and a second focusing lens group GF2 having a positive refractive power arranged closer to the image surface side than the first focusing lens group GF1.
  • the arrangement is such that the interval between adjacent lens groups changes during magnification and the first lens group G1 is fixed with respect to the image surface I (step ST12). Also, the arrangement is such that the first focusing lens group GF1 and the second focusing lens group GF2 move along the optical axis on different trajectories during focusing (step ST13). Then, the lenses are arranged in the lens barrel so as to satisfy at least the above conditional expressions (3) and (4) (step ST14).
  • This manufacturing method makes it possible to manufacture a variable-magnification optical system that is small, yet bright and has good optical performance.
  • FIGS 1, 4, and 7 are cross-sectional views showing the configuration and refractive power distribution of the variable magnification optical system ZL ⁇ ZL(1) to ZL(3) ⁇ according to the first to third examples.
  • the movement direction of each lens group when changing magnification from the wide-angle end state (W) to the telephoto end state (T) is indicated by arrows.
  • the movement direction of the focusing lens group when focusing from infinity to a close-distance object is indicated by an arrow together with the word "focus.”
  • each lens group is represented by a combination of the symbol G and a number
  • each lens is represented by a combination of the symbol L and a number.
  • the lens groups, etc. are represented using different combinations of symbols and numbers for each embodiment. Therefore, even if the same combinations of symbols and numbers are used between embodiments, this does not mean that they have the same configuration.
  • Tables 1 to 3 are shown below, with Table 1 showing data on the various elements in the first embodiment, Table 2 showing data on the second embodiment, and Table 3 showing data on the third embodiment.
  • f is the focal length of the entire lens system
  • FNO is the F-number
  • ⁇ is the half angle of view (unit: ° (degrees))
  • Y is the image height.
  • TL is the distance on the optical axis from the lens surface closest to the object in the variable magnification optical system to the lens surface closest to the image surface when focused at infinity plus Bf (back focus)
  • Bf is the distance on the optical axis from the lens surface closest to the image surface in the variable magnification optical system to the image surface when focused at infinity.
  • the surface number indicates the order of the optical surfaces from the object side along the direction of light travel
  • R is the radius of curvature of each optical surface (surfaces whose center of curvature is on the image side are given a positive value)
  • D is the surface spacing which is the distance on the optical axis from each optical surface to the next optical surface (or image surface)
  • nd is the refractive index of the material of the optical component with respect to the d-line
  • ⁇ d is the Abbe number based on the d-line of the material of the optical component.
  • the " ⁇ " in the radius of curvature indicates a plane or an aperture, and (stop S) indicates the aperture stop S.
  • the refractive index of air, nd 1.00000, has been omitted. If the optical surface is aspheric, an * is added to the surface number, and the paraxial radius of curvature is shown in the column for radius of curvature R.
  • X(y) is the distance (sag amount) along the optical axis direction from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at height y
  • R is the radius of curvature of the reference sphere (paraxial radius of curvature)
  • ⁇ is the conic constant
  • Ai is the ith aspherical coefficient.
  • the second-order aspherical coefficient A2 is 0, and is omitted.
  • the [Variable Distance Data] table shows the surface spacing for surface number i, where the surface spacing in the [Lens Specifications] table is (Di).
  • the [Variable Distance Data] table also shows the surface spacing when focused at infinity and when focused at close range. D0 indicates the distance from the object to the lens surface closest to the object in the variable magnification optical system.
  • the "Lens Group Data” table shows the starting surface (the surface closest to the object) and focal length of each lens group.
  • the focal length f, radius of curvature R, surface spacing D, and other lengths are generally given in "mm" unless otherwise specified, but this is not limited to the optical system, as the same optical performance can be obtained even when proportionally enlarged or reduced.
  • Fig. 1 is a diagram showing the lens configuration of a variable magnification optical system according to the first embodiment.
  • the variable magnification optical system ZL(1) according to the first embodiment is composed of, arranged in order from the object side along the optical axis, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having positive refractive power, a sixth lens group G6 having positive refractive power, a seventh lens group G7 having positive refractive power, an eighth lens group G8 having negative refractive power, and a ninth lens group G9 having positive refractive power.
  • the second lens group G2, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 move along the optical axis as shown by the arrows in Fig. 1, and the intervals between the adjacent lens groups change.
  • the first lens group G1, the third lens group G3, and the ninth lens group G9 are fixed with respect to the image plane I.
  • an aperture stop S is disposed between the third lens group G3 and the fourth lens group G4, and during the magnification change, the aperture stop S and the third lens group G3 are 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 in all the following examples.
  • the first lens group G1 is composed of, arranged in order from the object side along the optical axis, a cemented positive lens formed by cementing together a meniscus-shaped negative lens L11 with its convex surface facing the object side and a biconvex positive lens L12, and a meniscus-shaped positive lens L13 with its convex surface facing the object side.
  • the second lens group G2 is composed of, arranged in order from the object side along the optical axis, a meniscus negative lens L21 with its convex surface facing the object side, a biconcave negative lens L22, a meniscus positive lens L23 with its convex surface facing the object side, and a biconcave negative lens L24.
  • the third lens group G3 is composed of, arranged in order from the object side along the optical axis, a meniscus-shaped positive lens L31 with its convex surface facing the object side, a meniscus-shaped positive lens L32 with its convex surface facing the object side, and a cemented positive lens formed by cementing together a meniscus-shaped negative lens L33 with its convex surface facing the object side and a meniscus-shaped positive lens L34 with its convex surface facing the object side.
  • the fourth lens group G4 is composed of, arranged in order from the object side along the optical axis, a biconcave negative lens L41, a cemented negative lens formed by cementing a biconcave negative lens L42 and a meniscus positive lens L43 with its convex surface facing the object side.
  • the fifth lens group G5 is composed of, arranged in order from the object side along the optical axis, a biconvex positive lens L51, and a cemented positive lens formed by cementing a biconvex positive lens L52 and a biconcave negative lens L53.
  • the lens surface facing the object side of the positive lens L51 is aspheric.
  • the sixth lens group G6 is composed of a biconvex positive lens L61.
  • the seventh lens group G7 is composed of, arranged in order from the object side along the optical axis, a meniscus positive lens L71 with its concave surface facing the object side, a meniscus negative lens L72 with its convex surface facing the object side, a cemented negative lens formed by cementing together a biconvex positive lens L73 and a biconcave negative lens L74, and a biconvex positive lens L75.
  • the lens surface facing the image surface of the meniscus negative lens L72 is aspheric.
  • the eighth lens group G8 is composed of a negative meniscus lens L81 with its concave surface facing the object side.
  • the ninth lens group G9 is composed of a negative meniscus lens L91 with its concave surface facing the object side, and a positive biconvex lens L92, arranged in order from the object side along the optical axis.
  • An image surface I is located on the image side of the ninth lens group G9.
  • the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, the eighth lens group G8, and the ninth lens group G9 constitute the rear group GR.
  • the fourth lens group G4 corresponds to the first focusing lens group GF1
  • the sixth lens group G6 corresponds to the second focusing lens group GF2.
  • the eighth lens group G8 corresponds to the third focusing lens group GF3
  • the ninth lens group G9 corresponds to the final lens group GE.
  • the first focusing lens group GF1 (fourth lens group G4) and the third focusing lens group GF3 (eighth lens group G8) move along the optical axis with different trajectories (movement amounts) toward the image surface
  • the second focusing lens group GF2 (sixth lens group G6) moves along the optical axis toward the object side.
  • the first focusing lens group GF1 fourth lens group G4
  • the second focusing lens group GF2 sixth lens group G6
  • the third focusing lens group GF3 fifth lens group G8
  • Table 1 below lists the values of the parameters of the variable magnification optical system in the first embodiment.
  • Figure 2 shows various aberration diagrams when the variable magnification optical system of the first embodiment is focused on infinity in the wide-angle end state.
  • Figure 3 shows various aberration diagrams when the variable magnification optical system of the first embodiment is focused on infinity in the telephoto end state.
  • FNO indicates the F-number
  • Y indicates the image height.
  • the spherical aberration diagram shows the F-number value corresponding to the maximum aperture
  • the astigmatism diagram and the distortion aberration diagram show the maximum image height
  • the coma aberration diagram shows the value of each image height.
  • the solid line indicates the sagittal image surface
  • the dashed line indicates the meridional image surface. Note that the same symbols as in this embodiment are used in the aberration diagrams of each embodiment shown below, and duplicate explanations are omitted.
  • variable magnification optical system of Example 1 has excellent imaging performance, with various aberrations being well corrected from the wide-angle end state to the telephoto end state.
  • FIG. 4 is a diagram showing the lens configuration of the variable magnification optical system according to the second embodiment.
  • the variable magnification optical system ZL(2) according to the second embodiment is composed of a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having positive refractive power, a sixth lens group G6 having positive refractive power, a seventh lens group G7 having negative refractive power, and an eighth lens group G8 having negative refractive power, which are arranged in order from the object side along the optical axis.
  • the second lens group G2, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 move along the optical axis as shown by the arrows in FIG. 4, and the intervals between the adjacent lens groups change.
  • the first lens group G1, the third lens group G3, and the eighth lens group G8 are fixed with respect to the image plane I.
  • an aperture diaphragm S is disposed between the third lens group G3 and the fourth lens group G4, and during magnification change, the aperture diaphragm S and the third lens group G3 are fixed with respect to the image plane I.
  • the first lens group G1 is composed of, arranged in order from the object side along the optical axis, a cemented positive lens formed by cementing together a meniscus-shaped negative lens L11 with its convex surface facing the object side and a biconvex positive lens L12, and a meniscus-shaped positive lens L13 with its convex surface facing the object side.
  • the second lens group G2 is composed of, arranged in order from the object side along the optical axis, a meniscus negative lens L21 with its convex surface facing the object side, a biconcave negative lens L22, a meniscus positive lens L23 with its convex surface facing the object side, and a biconcave negative lens L24.
  • the third lens group G3 is composed of, arranged in order from the object side along the optical axis, a meniscus-shaped positive lens L31 with its convex surface facing the object side, a meniscus-shaped positive lens L32 with its convex surface facing the object side, and a cemented positive lens formed by cementing together a meniscus-shaped negative lens L33 with its convex surface facing the object side and a meniscus-shaped positive lens L34 with its convex surface facing the object side.
  • the fourth lens group G4 is composed of, arranged in order from the object side along the optical axis, a meniscus-shaped negative lens L41 with its convex surface facing the object side, and a cemented negative lens formed by cementing together a biconcave negative lens L42 and a meniscus-shaped positive lens L43 with its convex surface facing the object side.
  • the fifth lens group G5 is composed of, arranged in order from the object side along the optical axis, a biconvex positive lens L51, and a cemented positive lens formed by cementing a biconvex positive lens L52 and a biconcave negative lens L53.
  • the lens surface facing the object side of the positive lens L51 is aspheric.
  • the sixth lens group G6 is composed of a biconvex positive lens L61.
  • the seventh lens group G7 is composed of, arranged from the object side along the optical axis, a biconvex positive lens L71, a meniscus negative lens L72 with its convex surface facing the object side, a cemented negative lens formed by cementing together a meniscus positive lens L73 with its concave surface facing the object side and a biconcave negative lens L74, and a biconvex positive lens L75.
  • the lens surface facing the image surface of the meniscus negative lens L72 is aspheric.
  • the eighth lens group G8 is composed of a negative meniscus lens L81 with its concave surface facing the object side, and a positive biconvex lens L82, arranged in order from the object side along the optical axis.
  • An image surface I is located on the image side of the eighth lens group G8.
  • the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 constitute the rear group GR.
  • the fourth lens group G4 corresponds to the first focusing lens group GF1
  • the sixth lens group G6 corresponds to the second focusing lens group GF2.
  • the eighth lens group G8 corresponds to the final lens group GE.
  • the first focusing lens group GF1 (fourth lens group G4) and the second focusing lens group GF2 (sixth lens group G6) move toward the object side along the optical axis with different trajectories (movement amounts).
  • the second focusing lens group GF2 when focusing from an object at infinity to an object at close range, only the second focusing lens group GF2 (sixth lens group G6) moves toward the object side along the optical axis.
  • Table 2 below lists the values of the parameters of the variable magnification optical system in the second embodiment.
  • Figure 5 shows various aberrations of the variable magnification optical system of Example 2 when focused on infinity in the wide-angle end state.
  • Figure 6 shows various aberrations of the variable magnification optical system of Example 2 when focused on infinity in the telephoto end state. From each aberration diagram, it can be seen that the variable magnification optical system of Example 2 has excellent imaging performance with various aberrations well corrected from the wide-angle end state to the telephoto end state.
  • Fig. 7 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 is composed of, arranged in order from the object side along the optical axis, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having negative refractive power, a sixth lens group G6 having positive refractive power, a seventh lens group G7 having positive refractive power, an eighth lens group G8 having negative refractive power, and a ninth lens group G9 having negative refractive power.
  • the second lens group G2, the third lens group G3, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 move along the optical axis as shown by the arrows in Fig. 7, and the intervals between the adjacent lens groups change.
  • the first lens group G1, the fourth lens group G4, and the ninth lens group G9 are fixed with respect to the image plane I.
  • an aperture diaphragm S is disposed between the third lens group G3 and the fourth lens group G4, and during the magnification change, the aperture diaphragm S and the fourth lens group G4 are fixed with respect to the image plane I.
  • the first lens group G1 is composed of, arranged in order from the object side along the optical axis, a cemented positive lens formed by cementing together a meniscus-shaped negative lens L11 with its convex surface facing the object side and a biconvex positive lens L12, and a meniscus-shaped positive lens L13 with its convex surface facing the object side.
  • the second lens group G2 is composed of, arranged in order from the object side along the optical axis, a meniscus negative lens L21 with its convex surface facing the object side, a biconcave negative lens L22, a meniscus positive lens L23 with its convex surface facing the object side, and a biconcave negative lens L24.
  • the third lens group G3 is composed of, arranged in order from the object side along the optical axis, a biconvex positive lens L31 and a meniscus positive lens L32 with its convex surface facing the object side.
  • the fourth lens group G4 is composed of a cemented negative lens in which, in order from the object side along the optical axis, a meniscus-shaped negative lens L41 with its convex surface facing the object side and a meniscus-shaped positive lens L42 with its convex surface facing the object side are cemented together.
  • the fifth lens group G5 is composed of, arranged in order from the object side along the optical axis, a biconcave negative lens L51, a meniscus negative lens L52 with its convex surface facing the object side, and a meniscus positive lens L53 with its convex surface facing the object side.
  • the sixth lens group G6 is composed of, arranged in order from the object side along the optical axis, a biconvex positive lens L61, a cemented positive lens formed by cementing together a meniscus negative lens L62 with its convex surface facing the object side and a biconvex positive lens L63.
  • the seventh lens group G7 is composed of a positive meniscus lens L71 with its convex surface facing the object side.
  • the eighth lens group G8 is composed of a meniscus negative lens L81 with its convex surface facing the object side, and a biconvex positive lens L82, arranged in order from the object side along the optical axis.
  • the lens surface facing the object side of the meniscus negative lens L81 is aspheric.
  • the ninth lens group G9 is composed of a meniscus negative lens L91 with its concave surface facing the object side, and a biconvex positive lens L92, arranged in order from the object side along the optical axis.
  • the lens surface facing the object side of the meniscus negative lens L91 is aspheric.
  • An image surface I is located on the image side of the ninth lens group G9.
  • the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, the eighth lens group G8, and the ninth lens group G9 constitute the rear group GR.
  • the fifth lens group G5 corresponds to the first focusing lens group GF1
  • the seventh lens group G7 corresponds to the second focusing lens group GF2.
  • the ninth lens group G9 corresponds to the final lens group GE.
  • the first focusing lens group GF1 (fifth lens group G5) and the second focusing lens group GF2 (seventh lens group G7) move toward the object along the optical axis on different trajectories (movement amounts).
  • Table 3 below lists the values of the parameters of the variable magnification optical system in the third embodiment.
  • FIG. 8 is a diagram showing various aberrations when the variable magnification optical system of Example 3 is focused on infinity in the wide-angle end state.
  • FIG. 9 is a diagram showing various aberrations when the variable magnification optical system of Example 3 is focused on infinity in the telephoto end state. From each aberration diagram, it can be seen that the variable magnification optical system of Example 3 has excellent imaging performance with various aberrations well corrected from the wide-angle end state to the telephoto end state.
  • Conditional formula (1) 0.05 ⁇ ( ⁇ f2)/f1 ⁇ 1.00
  • Conditional formula (2) 0.02 ⁇ Bft/ft ⁇ 0.15
  • Conditional formula (3) 0.10 ⁇ ( ⁇ fF1)/fF2 ⁇ 1.30
  • Condition (4) 0.01 ⁇ Bfw/fw ⁇ 0.50
  • Conditional formula (5) 0.50 ⁇ f2/fF1 ⁇ 1.00
  • Conditional formula (6) 1.20 ⁇ f1/fF2 ⁇ 2.00
  • Conditional formula (7) 0.50 ⁇ f3/fF2 ⁇ 1.00
  • Conditional formula (8) 2.00 ⁇ TLw/fw ⁇ 6.00
  • Conditional formula (9) 0.01 ⁇ ( ⁇ f2)/f3 ⁇ 2.00
  • Conditional formula (10) 1.80 ⁇ f1/f3 ⁇ 2.50
  • Conditional formula (11) 0.01 ⁇
  • Conditional formula (12) 0.10 ⁇ f2/fr1 ⁇
  • the above embodiments make it possible to realize a variable magnification optical system that is small, yet bright and has good optical performance.
  • variable magnification optical system of each embodiment variable magnification optical systems with other group configurations (for example, 10 groups, 11 groups, 12 groups, etc.) can also be configured.
  • a lens or lens group can be added to the variable magnification optical system of each embodiment closest to the object or closest to the image surface.
  • a lens or lens group can be added to the rear group closest to the object or closest to the image surface in the variable magnification optical system of each embodiment.
  • a lens group refers to a portion having at least one lens separated by an air gap that changes when the magnification is changed.
  • variable power optical system of each embodiment instead of the above-mentioned first to third focusing lens groups, a single lens group or multiple lens groups, or a partial lens group may be moved in the optical axis direction to serve as a focusing lens group that focuses from an object at infinity to an object at a close distance.
  • the focusing lens group can also be applied to autofocus, and is suitable for motor drive (using an ultrasonic motor, etc.) for autofocus.
  • the lens group or partial lens group may be moved so as to have a component in a direction perpendicular to the optical axis, or rotated (rocked) in a plane including the optical axis to serve as an anti-vibration lens group that corrects image blur caused by camera shake.
  • the lens surface may be spherical or 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. It is also preferable because there is little degradation of imaging performance even if the image plane is misaligned.
  • the aspheric surface may be any of the following: an aspheric surface created by grinding, a glass-molded aspheric surface in which glass is formed into an aspheric shape using a mold, or a composite aspheric surface in which resin is formed into an aspheric shape on the surface of glass.
  • the lens surface may also 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 diaphragm is preferably located between the third and fourth lens groups, but it is also possible to use the lens frame instead of a separate aperture diaphragm component.
  • Each lens surface may be coated with an anti-reflective coating that has high transmittance over a wide wavelength range to reduce flare and ghosting and achieve high-contrast optical performance.

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Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2016139125A (ja) * 2015-01-21 2016-08-04 パナソニックＩｐマネジメント株式会社 ズームレンズ系、交換レンズ装置及びカメラシステム
JP2018092185A (ja) * 2013-02-22 2018-06-14 パナソニックＩｐマネジメント株式会社 ズームレンズ系、交換レンズ装置及びカメラシステム
JP2019074671A (ja) * 2017-10-17 2019-05-16 キヤノン株式会社 レンズ装置、撮像装置および制御方法
WO2020105104A1 (ja) * 2018-11-20 2020-05-28 株式会社ニコン 変倍光学系、光学機器および変倍光学系の製造方法
JP2020085915A (ja) * 2018-11-15 2020-06-04 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018092185A (ja) * 2013-02-22 2018-06-14 パナソニックＩｐマネジメント株式会社 ズームレンズ系、交換レンズ装置及びカメラシステム
JP2016139125A (ja) * 2015-01-21 2016-08-04 パナソニックＩｐマネジメント株式会社 ズームレンズ系、交換レンズ装置及びカメラシステム
JP2019074671A (ja) * 2017-10-17 2019-05-16 キヤノン株式会社 レンズ装置、撮像装置および制御方法
JP2020085915A (ja) * 2018-11-15 2020-06-04 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
WO2020105104A1 (ja) * 2018-11-20 2020-05-28 株式会社ニコン 変倍光学系、光学機器および変倍光学系の製造方法

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