WO2022259649A1 - 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 PDFInfo
- Publication number
- WO2022259649A1 WO2022259649A1 PCT/JP2022/008965 JP2022008965W WO2022259649A1 WO 2022259649 A1 WO2022259649 A1 WO 2022259649A1 JP 2022008965 W JP2022008965 W JP 2022008965W WO 2022259649 A1 WO2022259649 A1 WO 2022259649A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lens group
- lens
- optical system
- group
- negative
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 457
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title description 9
- 230000014509 gene expression Effects 0.000 claims description 242
- 239000006185 dispersion Substances 0.000 claims description 24
- 239000002131 composite material Substances 0.000 claims description 5
- 230000004075 alteration Effects 0.000 description 240
- 230000000694 effects Effects 0.000 description 93
- 230000005499 meniscus Effects 0.000 description 93
- 238000010586 diagram Methods 0.000 description 87
- 238000003384 imaging method Methods 0.000 description 15
- 206010010071 Coma Diseases 0.000 description 12
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 2
- 208000001644 thecoma Diseases 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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 disclosure relates to a variable power optical system, an optical device, and a method of manufacturing a variable power optical system.
- variable power optical systems used in optical equipment such as photographic cameras, electronic still cameras, and video cameras have been proposed (see Patent Document 1, for example).
- the variable power optical system of the present disclosure has a plurality of lens groups of 6 or more groups, and the plurality of lens groups includes a first lens group having positive refractive power and a lens group arranged closer to the image side than the first lens group
- the distance between each lens group changes during zooming, and the first lens group consists of two or less lenses, and both satisfy the following conditional expressions. 8.00 ⁇ f1/D1 ⁇ 27.00 1.00 ⁇ M1/D1 ⁇ 12.00 however, f1: focal length of the first lens group D1: thickness of the first lens group on the optical axis M1: amount of movement of the first lens group during zooming from the wide-angle end state to the telephoto end state
- a method for manufacturing a variable magnification optical system of the present disclosure has a plurality of lens groups of six or more groups, and the plurality of lens groups includes a first lens group having positive refractive power and a A method for manufacturing a variable power optical system comprising a rear group arranged in a 2nd group, wherein the distance between each lens group changes during zooming, and the first lens group is made up of two or more lenses. Arrange so that both conditional expressions are satisfied.
- f1 focal length of the first lens group
- D1 thickness of the first lens group on the optical axis
- M1 amount of movement of the first lens group during zooming from the wide-angle end state to the telephoto end state
- FIG. 4 is a cross-sectional view of the variable magnification optical system of the first embodiment when focusing on an object at an infinite distance in the wide-angle end state
- FIG. 10 is a diagram of various aberrations in the wide-angle end state of the variable power optical system of the first embodiment when focusing on an object at infinity
- 4A and 4B are various aberration diagrams when focusing on an object at infinity in an intermediate focal length state of the variable-magnification optical system of the first embodiment
- 4A and 4B are various aberration diagrams in the telephoto end state of the variable magnification optical system of the first embodiment when focusing on an object at infinity
- FIG. 10 is a diagram of various aberrations in the wide-angle end state of the variable power optical system of the first embodiment when focusing on an object at infinity
- 4A and 4B are various aberration diagrams when focusing on an object at infinity in an intermediate focal length state of the variable-magnification optical system of the first embodiment
- 4A and 4B are various aberration
- FIG. 11 is a cross-sectional view of the variable power optical system of the second embodiment when focusing on an object at an infinite distance in the wide-angle end state;
- FIG. 10 is a diagram of various aberrations in the wide-angle end state of the variable-magnification optical system of the second embodiment when focusing on an object at infinity;
- FIG. 10 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable magnification optical system of the second embodiment;
- 10A and 10B are various aberration diagrams in the telephoto end state of the variable power optical system of the second embodiment when focusing on an object at infinity.
- FIG. 11 is a cross-sectional view of the variable power optical system of the third embodiment when focusing on an object at an infinite distance in the wide-angle end state;
- FIG. 10 is a diagram of various aberrations in the wide-angle end state of the variable-magnification optical system of the third embodiment when focusing on an object at infinity;
- FIG. 10 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable power optical system of the third embodiment;
- FIG. 10 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the third embodiment;
- FIG. 10 is a cross-sectional view of the variable power optical system of the fourth embodiment when focusing on an object at an infinite distance in the wide-angle end state;
- FIG. 10 is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the fourth embodiment;
- FIG. 11 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable power optical system of the fourth embodiment;
- FIG. 10 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable magnification optical system of the fourth embodiment;
- FIG. 12 is a cross-sectional view of the variable power optical system of the fifth embodiment when focusing on an object at an infinite distance in the wide-angle end state;
- FIG. 11 is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the fifth embodiment;
- FIG. 10 is a diagram of various aberrations during focusing on an object at infinity in an intermediate focal length state of the variable power optical system of the fifth embodiment;
- FIG. 11 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the fifth embodiment;
- FIG. 12 is a cross-sectional view of the variable power optical system of the sixth embodiment when focusing on an object at the wide-angle end;
- FIG. 11 is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the sixth embodiment;
- FIG. 11 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable-magnification optical system of the sixth embodiment;
- FIG. 10 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the sixth embodiment;
- FIG. 20 is a cross-sectional view of the variable magnification optical system of the seventh embodiment when focusing on an object at an infinite distance in the wide-angle end state;
- FIG. 11 is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the seventh embodiment
- FIG. 12 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable-magnification optical system of the seventh embodiment
- FIG. 10 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the seventh embodiment
- FIG. 20 is a cross-sectional view of the variable power optical system of the eighth embodiment when focusing on an object at an infinite distance in the wide-angle end state
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the eighth embodiment
- FIG. 12 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable-magnification optical system of the eighth embodiment
- FIG. 11 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the eighth embodiment
- FIG. 20 is a cross-sectional view of the variable power optical system of the ninth embodiment when focusing on an object at an infinite distance in the wide-angle end state
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-power optical system of the ninth embodiment;
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable power optical system of the ninth embodiment;
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable magnification optical system of the ninth embodiment;
- FIG. 20 is a cross-sectional view of the variable power optical system of the tenth embodiment when focusing on an object at an infinite distance in the wide-angle end state;
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the tenth embodiment;
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable power optical system of the tenth embodiment;
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable-magnification optical system of the tenth embodiment;
- FIG. 20 is a cross-sectional view of the variable magnification optical system of the eleventh embodiment when focusing on an object at an infinite distance in the wide-angle end state;
- FIG. 20 is a diagram of various aberrations in the wide-angle end state of the variable power optical system of the eleventh embodiment when focusing on an object at infinity;
- FIG. 20 is a diagram of various aberrations when focusing on an object at infinity in an intermediate focal length state of the variable-magnification optical system of the eleventh embodiment;
- FIG. 21 is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the eleventh embodiment;
- 1 is a schematic diagram of a camera provided with a variable-magnification optical system of this embodiment;
- FIG. 4 is a flow chart showing an outline of a method for manufacturing the variable magnification optical system of the present embodiment;
- variable power optical system an optical device, and a method for manufacturing a variable power optical system according to embodiments of the present application will be described below.
- the variable-magnification optical system of this embodiment has a plurality of lens groups of six or more groups, and the plurality of lens groups includes a first lens group having a positive refractive power and a lens group arranged closer to the image side than the first lens group.
- the distance between the lens groups changes during zooming, and the first lens group consists of two or less lenses, and both satisfy the following conditional expressions.
- M1 amount of movement of the first lens group during zooming from the wide-angle end state to the telephoto end state
- variable magnification optical system of this embodiment can realize a lightweight variable magnification optical system by using two or less first lens groups.
- Conditional expression (1) defines the ratio between the focal length of the first lens group and the thickness of the first lens group on the optical axis.
- conditional expression (1) exceeds the upper limit in the variable-magnification optical system of this embodiment, the thickness of the first lens group along the optical axis becomes too small, causing various problems such as spherical aberration during zooming. It becomes difficult to appropriately suppress variations in aberration.
- the upper limit of conditional expression (1) is set to 26.50, 26.25, 26.10, 25.00, 22.50, 20.00, 17. Preferably set to 50, 15.00 and even 14.00.
- conditional expression (1) if the value of conditional expression (1) is below the lower limit in the variable power optical system of the present embodiment, the refractive power of the first lens group becomes too strong, causing various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- the lower limit of conditional expression (1) is set to 8.20, 8.40, 8.50, 8.75, 9.00, 9.10, 9.20, 8.40, 8.50, 8.75, 9.00, 9.10, 9.10 20, preferably set to 9.30.
- Conditional expression (2) defines the ratio between the amount of movement of the first lens group and the thickness of the first lens group on the optical axis during zooming from the wide-angle end state to the telephoto end state.
- conditional expression (2) exceeds the upper limit in the variable power optical system of the present embodiment, the thickness of the first lens group along the optical axis becomes too small, causing various problems such as spherical aberration during zooming. It becomes difficult to appropriately suppress variations in aberration.
- the upper limit of conditional expression (2) is set to 11.75, 11.50, 11.25, 11.00, 10.90, 10.80, and further to 10 It is preferably set to .70.
- conditional expression (2) is below the lower limit in the variable-magnification optical system of this embodiment, the amount of movement of the first lens group becomes too large, causing various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- the lower limit of conditional expression (2) is set to 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, and further to 2 It is preferably set to .60.
- variable power optical system that satisfies both conditional expressions (1) and (2), it is possible to appropriately suppress fluctuations in various aberrations including spherical aberration during zooming.
- the rear group preferably has a first negative lens group having negative refractive power and satisfies the following conditional expression. (3) 1.00 ⁇ f1/(-fN1) ⁇ 8.00 however, fN1: focal length of the first negative lens group
- Conditional expression (3) defines the ratio between the focal length of the first lens group and the focal length of the first negative lens group.
- conditional expression (3) exceeds the upper limit value in the variable power optical system of this embodiment, the refractive power of the first negative lens group becomes too strong, and various aberrations including spherical aberration occur during variable power. It becomes difficult to appropriately suppress fluctuations.
- the upper limit of conditional expression (3) is set to 7.75, 7.50, 7.25, 7.00, 6.85, 6.75, and further to 6 It is preferably set to .65.
- conditional expression (3) if the value of conditional expression (3) is below the lower limit in the variable power optical system of the present embodiment, the refractive power of the first lens group becomes too strong, causing various aberrations such as spherical aberration during variable power. It becomes difficult to appropriately suppress the fluctuation of
- the lower limit of conditional expression (3) is set to 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2. Preferably set to 75, 3.00, 3.25 and even 3.50.
- the rear group includes a first negative lens group having negative refractive power and a second negative lens group having negative refractive power disposed closer to the image side than the first negative lens group. preferably have a lens group and satisfy the following equation. (4) 0.10 ⁇ f1/(-fN2) ⁇ 5.00 however, fN2: focal length of the second negative lens group
- Conditional expression (4) defines the ratio between the focal length of the first lens group and the focal length of the second negative lens group.
- conditional expression (4) exceeds the upper limit in the variable magnification optical system of the present embodiment, the refractive power of the second negative lens group becomes too strong, and various aberrations including spherical aberration occur during variable magnification. It becomes difficult to appropriately suppress fluctuations.
- the upper limit of conditional expression (4) is set to 4.85, 4.75, 4.60, 4.50, 4.25, and further to 4.00. preferably.
- conditional expression (4) if the value of conditional expression (4) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first lens group becomes too strong, resulting in various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- the lower limit of conditional expression (4) is set to 0.11, 0.12, 0.25, 0.30, 0.50, 0.75, 1. Preferably set to 00, 1.25, 1.75 and even 2.00.
- the rear group includes a first negative lens group having negative refractive power and a second negative lens group having negative refractive power disposed closer to the image side than the first negative lens group. preferably have a lens group and satisfy the following equation. (5) 0.01 ⁇ fN1/fN2 ⁇ 1.00 however, fN1: focal length of the first negative lens group fN2: focal length of the second negative lens group
- Conditional expression (5) defines the ratio between the focal length of the first negative lens group and the focal length of the second negative lens group.
- conditional expression (5) exceeds the upper limit in the variable-magnification optical system of this embodiment, the refractive power of the second negative lens group becomes too strong, and various aberrations such as spherical aberration occur during zooming. It becomes difficult to appropriately suppress fluctuations.
- the upper limit of conditional expression (5) is set to 0.95, 0.90, 0.85, 0.80, 0.75, 0.70, and further to 0. It is preferably set to .65.
- conditional expression (5) if the value of conditional expression (5) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first negative lens group becomes too strong, causing various problems such as spherical aberration during zooming. It becomes difficult to appropriately suppress variations in aberration.
- the lower limit of conditional expression (5) is set to 0.02, 0.05, 0.10, 0.15, 0.20, 0.25, and further to 0. It is preferably set to .30.
- the first negative lens group is preferably the lens group arranged closest to the object side among the lens groups having negative refractive power in the rear group.
- variable-magnification optical system of the present embodiment can appropriately suppress fluctuations in various aberrations, including spherical aberration, during zooming.
- the rear group preferably has a first positive lens group having positive refractive power and satisfies the following conditional expression. (6) 0.75 ⁇ f1/fP1 ⁇ 5.00 however, fP1: focal length of the first positive lens group
- Conditional expression (6) defines the ratio between the focal length of the first lens group and the focal length of the first positive lens group.
- conditional expression (6) exceeds the upper limit value in the variable power optical system of this embodiment, the refractive power of the first positive lens group becomes too strong, and various aberrations including spherical aberration occur during variable power. It becomes difficult to appropriately suppress fluctuations.
- the upper limit of conditional expression (6) is set to 4.90, 4.80, 4.75, 4.70, 4.60, 4.50, and further to 4 It is preferably set to .45.
- conditional expression (6) if the value of conditional expression (6) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first lens group becomes too strong, causing various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- the effects of this embodiment can be made more reliable.
- the lower limit of conditional expression (6) is set to 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1. A setting of 10, 1.15 or even 1.20 is preferred.
- the rear group includes a first positive lens group having positive refractive power and a first negative lens group having negative refractive power disposed closer to the image side than the first positive lens group. It is preferable to have a lens group and satisfy the following conditional expression. (7) 0.75 ⁇ fP1/(-fN1) ⁇ 4.50 however, fP1: focal length of the first positive lens group fN1: focal length of the first negative lens group
- Conditional expression (7) defines the ratio between the focal length of the first positive lens group and the focal length of the first negative lens group.
- conditional expression (7) exceeds the upper limit in the variable power optical system of this embodiment, the refractive power of the first negative lens group becomes too strong, and various aberrations including spherical aberration occur during variable power. It becomes difficult to appropriately suppress fluctuations.
- variable magnification optical system of this embodiment setting the upper limit of conditional expression (7) to 4.50 makes it possible to ensure the effect of this embodiment. Also, in order to ensure the effect of this embodiment, the upper limit of conditional expression (7) is set to 4.35, 4.25, 4.10, 4.00, 3.90, and further to 3.85. preferably.
- conditional expression (7) if the value of conditional expression (7) is below the lower limit in the variable power optical system of this embodiment, the refractive power of the first positive lens group becomes too strong, causing various problems such as spherical aberration during zooming. It becomes difficult to appropriately suppress variations in aberration.
- the lower limit of conditional expression (7) is set to 0.75 in the variable power optical system of this embodiment, the effects of this embodiment can be made more reliable. Further, in order to ensure the effect of this embodiment, the lower limit of conditional expression (7) is set to 0.85, 0.95, 1.00, 1.10, 1.20, 1.50, 1. 70, preferably set to 2.00.
- the rear group includes a first positive lens group having positive refractive power and a first negative lens group having negative refractive power disposed closer to the image side than the first positive lens group. It is preferable to have a lens group and satisfy the following conditional expression. (8) 1.00 ⁇ MP1/MN1 ⁇ 20.00 however, MP1: Amount of movement of the first positive lens group during zooming from the wide-angle end state to the telephoto end state MN1: Amount of movement of the first negative lens group during zooming from the wide-angle end state to the telephoto end state
- Conditional expression (8) defines the ratio between the amount of movement of the first positive lens group during zooming and the amount of movement of the first negative lens group during zooming.
- conditional expression (8) exceeds the upper limit value in the variable power optical system of this embodiment, the amount of movement of the first negative lens group becomes too small, and various aberrations such as spherical aberration occur during variable power. It becomes difficult to appropriately suppress fluctuations.
- the upper limit of conditional expression (8) is set to 18.00, 15.00, 12.25, 10.00, 9.00, 7.50, 6.00, 15.00, 12.25, 10.00, 9.00, 7.50, 6.00 Preferably set to 00, 5.50, 5.00, 4.50, 4.00 and even 3.50.
- conditional expression (8) is below the lower limit value in the variable power optical system of this embodiment, the amount of movement of the first positive lens group becomes too small, causing various problems such as spherical aberration during zooming. It becomes difficult to appropriately suppress variations in aberration.
- the lower limit of conditional expression (8) is set to 1.10, 1.25, 1.40, 1.50, 1.60, 1.75, and further 1 It is preferably set to .90.
- the rear group includes a first positive lens group having positive refractive power and a second positive lens group having positive refractive power disposed closer to the image side than the first positive lens group. It is preferable to have a lens group.
- variable-magnification optical system of the present embodiment can appropriately suppress fluctuations in various aberrations, including spherical aberration, during zooming.
- variable magnification optical system of this embodiment satisfy the following conditional expression. (9) 0.25 ⁇ fP1/fP2 ⁇ 3.50 however, fP1: focal length of the first positive lens group fP2: focal length of the second positive lens group
- Conditional expression (9) defines the ratio between the focal length of the first positive lens group and the focal length of the second positive lens group.
- conditional expression (9) exceeds the upper limit in the variable power optical system of the present embodiment, the refractive power of the second positive lens group becomes too strong, and various aberrations including spherical aberration occur during variable power. It becomes difficult to appropriately suppress fluctuations.
- the upper limit of conditional expression (9) is set to 3.45, 3.40, 3.35, 3.30, 3.25, and further to 3.20. preferably.
- conditional expression (9) if the value of conditional expression (9) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first positive lens group becomes too strong, causing various problems such as spherical aberration during zooming. It becomes difficult to appropriately suppress variations in aberration.
- the lower limit of conditional expression (9) is set to 0.28, 0.30, 0.35, 0.45, 0.50, 0.60, and further to 0. It is preferably set to .75.
- the first positive lens group is preferably the lens group arranged closest to the object side among the lens groups having positive refractive power in the rear group.
- variable-magnification optical system of the present embodiment can appropriately suppress fluctuations in various aberrations, including spherical aberration, during zooming.
- the rear group has a positive focusing group that has positive refractive power and moves along the optical axis during focusing, and satisfies the following conditional expression: is preferred. (10) 0.75 ⁇ f1/fFP ⁇ 4.50 however, fFP: Focal length of positive focus group
- Conditional expression (10) defines the ratio between the focal length of the first lens group and the focal length of the positive focus group.
- conditional expression (10) exceeds the upper limit value in the variable power optical system of this embodiment, the refractive power of the positive focus group becomes too strong, and variations in various aberrations including spherical aberration occur during focusing. It becomes difficult to suppress appropriately.
- the upper limit of conditional expression (10) is set to 4.25, 4.15, 4.00, 3.50, 3.25, 3.00, 2. Preferably set to 75, 2.60, 2.25 and even 2.00.
- conditional expression (10) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first lens group becomes too strong, causing various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- the effects of this embodiment can be made more reliable. Moreover, in order to ensure the effect of this embodiment, it is preferable to set the lower limit of conditional expression (10) to 0.80, 0.90, 0.95, and more preferably 1.00.
- the rear group has a positive focusing group that has positive refractive power and moves along the optical axis during focusing, and satisfies the following conditional expression: is preferred.
- fRPw Composite focal length in the wide-angle end state of the lens groups arranged on the image side of the positive focus group
- Conditional expression (11) defines the ratio between the focal length of the positive focus group and the combined focal length in the wide-angle end state of the lens groups arranged closer to the image side than the positive focus group.
- conditional expression (11) in the variable power optical system of this embodiment exceeds the upper limit, the refractive power of the lens group arranged closer to the image side than the positive focus group at the wide-angle end becomes too strong. It becomes difficult to appropriately suppress various aberrations including coma aberration in such a state.
- variable power optical system of the present embodiment setting the upper limit of conditional expression (11) to -0.50 makes it possible to ensure the effect of the present embodiment. Also, in order to ensure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (11) to ⁇ 0.55, ⁇ 0.60, ⁇ 0.65, and further ⁇ 0.70. .
- conditional expression (11) in the variable power optical system of this embodiment is below the lower limit, the refractive power of the positive focus group becomes too strong, causing various aberrations such as spherical aberration during focusing. It becomes difficult to appropriately suppress the fluctuation of
- the effect of the present embodiment can be made more reliable.
- the lower limit of conditional expression (11) is set to -3.40, -3.30, -3.25, -3.20, and further to -3.15. It is preferable to set
- the rear group has a negative focusing group that has negative refractive power and moves along the optical axis during focusing, and satisfies the following conditional expression: is preferred. (12) 0.10 ⁇ f1/(-fFN) ⁇ 4.00 however, fFN: Focal length of negative focus group
- Conditional expression (12) defines the ratio between the focal length of the first lens group and the focal length of the negative focus group.
- conditional expression (12) exceeds the upper limit in the variable power optical system of this embodiment, the refractive power of the negative focus group becomes too strong, and variations in various aberrations, including spherical aberration, occur during focusing. It becomes difficult to suppress appropriately.
- variable power optical system of this embodiment setting the upper limit of conditional expression (12) to 4.00 makes it possible to ensure the effects of this embodiment. Moreover, in order to ensure the effect of this embodiment, it is preferable to set the upper limit of conditional expression (12) to 3.90, 3.80, 3.55, 3.25, and further to 3.00. .
- conditional expression (12) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first lens group becomes too strong, resulting in various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- the lower limit of conditional expression (12) is set to 0.12, 0.25, 0.50, 0.75, 1.00, and further to 1.25. preferably.
- the rear group has a negative focusing group that has negative refractive power and moves along the optical axis during focusing, and satisfies the following conditional expression: is preferred. (13) -25.00 ⁇ (-fFN)/fRNw ⁇ 1.00 however, fFN: Focal length of the negative focusing group fRNw: Composite focal length in the wide-angle end state of the lens groups arranged on the image side of the negative focusing group
- Conditional expression (13) defines the ratio between the focal length of the negative focusing group and the focal length of the lens group arranged closer to the image side than the negative focusing group in the wide-angle end state.
- conditional expression (13) in the variable power optical system of this embodiment exceeds the upper limit, the refractive power of the lens group arranged closer to the image side than the negative focus group at the wide-angle end becomes too strong. It becomes difficult to appropriately suppress various aberrations including coma aberration in such a state.
- the upper limit of conditional expression (13) is set to 0.90, 0.80, 0.75, 0.70, 0.65, 0.60, 0.90, 0.80, 0.75, 0.70, 0.65, 0.60. 55, preferably set to 0.50.
- conditional expression (13) in the variable power optical system of the present embodiment is below the lower limit, the refractive power of the negative focus group becomes too strong, causing various aberrations such as spherical aberration during focusing. It becomes difficult to appropriately suppress the fluctuation of
- the lower limit of conditional expression (13) is set to ⁇ 24.00, ⁇ 20.00, ⁇ 17.50, ⁇ 15.00, ⁇ 12.25, ⁇ Preferably set to 10.00, -7.50, -5.00, -2.50, or even -1.50.
- the final lens group located closest to the image side among the lens groups in the rear group preferably has negative refractive power and satisfies the following conditional expression. (14) 0.10 ⁇ f1/(-fR) ⁇ 5.00 however, fR: focal length of the final lens group
- Conditional expression (14) defines the ratio between the focal length of the first lens group and the focal length of the final lens group.
- conditional expression (14) exceeds the upper limit value in the variable magnification optical system of this embodiment, the refractive power of the final lens group becomes too strong, and fluctuations in various aberrations including coma aberration during zooming occur. It becomes difficult to suppress appropriately.
- the upper limit of conditional expression (14) is set to 4.95, 4.90, 4.85, 4.50, 4.25, 4.00, and further to 3 It is preferably set to .75.
- conditional expression (14) if the value of conditional expression (14) is below the lower limit in the variable power optical system of this embodiment, the refractive power of the first lens group becomes too strong, causing various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- variable magnification optical system of this embodiment setting the lower limit of conditional expression (14) to 0.10 makes it possible to ensure the effects of this embodiment. Also, in order to ensure the effect of this embodiment, the lower limit of conditional expression (14) is set to 0.25, 0.40, 0.50, 0.60, 0.70, and further to 0.75. preferably.
- the final lens group arranged closest to the image side among the lens groups in the rear group preferably has a positive refractive power and satisfies the following conditional expression. (15) 0.10 ⁇ f1/fR ⁇ 1.50 however, fR: focal length of the final lens group
- Conditional expression (15) defines the ratio between the focal length of the first lens group and the focal length of the final lens group.
- conditional expression (15) exceeds the upper limit in the variable power optical system of the present embodiment, the refractive power of the final lens group becomes too strong, and fluctuations in various aberrations including coma aberration during zooming occur. It becomes difficult to suppress it appropriately.
- the upper limit of conditional expression (15) is set to 1.40, 1.30, 1.25, 1.20, 1.15, 1.10, and further 1 It is preferably set to 0.05.
- conditional expression (15) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first lens group becomes too strong, resulting in various aberrations such as spherical aberration during zooming. It becomes difficult to appropriately suppress the fluctuation of
- variable power optical system of this embodiment setting the lower limit of conditional expression (15) to 0.10 makes it possible to ensure the effect of this embodiment. Also, in order to ensure the effect of this embodiment, it is preferable to set the lower limit of conditional expression (15) to 0.15, 0.20, 0.25, 0.30, and more preferably 0.35. .
- the first lens group has at least one lens that satisfies both of the following conditional expressions. (16) 1.45 ⁇ nd1 ⁇ 2.10 (17) 20.00 ⁇ vd1 ⁇ 75.00 however, nd1: refractive index of the lens in the first lens group for the d-line ⁇ d1: Abbe number of the lens in the first lens group with respect to the d-line
- Conditional expression (16) defines the refractive index for the d-line of the lenses in the first lens group
- conditional expression (17) defines the Abbe number of the lenses in the first lens group with respect to the d-line. It is something to do.
- the first lens group has at least one lens that satisfies both conditional expressions (16) and (17). Aberrations and chromatic aberrations can be corrected well.
- conditional expression (16) exceeds the upper limit in the variable magnification optical system of the present embodiment, the refractive power of the final lens group becomes too strong, and fluctuations in various aberrations including coma during magnification change occur. It becomes difficult to suppress it appropriately.
- variable magnification optical system of this embodiment setting the upper limit of conditional expression (16) to 2.10 makes it possible to ensure the effects of this embodiment. Also, in order to ensure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (16) to 2.05, 2.00, and more preferably 1.98.
- conditional expression (16) in the variable power optical system of this embodiment is below the lower limit, the refractive power of the lenses in the first lens group becomes too weak, causing spherical aberration and other aberrations in the telephoto end state. It becomes difficult to improve various aberrations.
- variable magnification optical system of this embodiment setting the lower limit of conditional expression (16) to 1.45 makes it possible to ensure the effect of this embodiment. Also, in order to ensure the effect of this embodiment, it is preferable to set the lower limit of conditional expression (16) to 1.48, 1.50, 1.53, 1.55, and more preferably 1.57. .
- conditional expression (17) exceeds the upper limit in the variable-magnification optical system of this embodiment, the dispersion of the lenses in the first lens group becomes too small, making it difficult to satisfactorily correct chromatic aberration in the telephoto end state. becomes.
- variable power optical system of this embodiment setting the upper limit of conditional expression (17) to 75.00 makes it possible to ensure the effects of this embodiment. Moreover, in order to ensure the effect of this embodiment, it is preferable to set the upper limit of conditional expression (17) to 74.00, 72.50, 71.00, 70.00, and further to 68.50. .
- conditional expression (17) in the variable power optical system of this embodiment is below the lower limit, the dispersion of the lenses in the first lens group becomes too small, and chromatic aberration at the telephoto end state cannot be satisfactorily corrected. becomes difficult.
- variable magnification optical system of this embodiment setting the lower limit of conditional expression (17) to 20.00 makes it possible to ensure the effects of this embodiment. Moreover, in order to ensure the effect of this embodiment, it is preferable to set the lower limit of conditional expression (17) to 21.00, 22.50, and further to 23.00.
- the lens arranged closest to the image side satisfies the following conditional expression. (18) -12.00 ⁇ (r2-r1)/(r2+r1) ⁇ 2.00 however, r1: the radius of curvature of the object-side lens surface of the lens closest to the image side r1: the radius of curvature of the image-side lens surface of the lens closest to the image side
- Conditional expression (18) defines the shape factor of the lens arranged closest to the image side.
- the variable-power optical system of the present embodiment can appropriately suppress fluctuations in various aberrations including coma aberration during zooming.
- conditional expression (18) exceeds the upper limit value in the variable power optical system of this embodiment, the coma aberration cannot be corrected appropriately by the lens closest to the image side. It becomes difficult to appropriately suppress variations in aberrations and other aberrations.
- variable magnification optical system of the present embodiment setting the upper limit of conditional expression (18) to 2.00 makes it possible to ensure the effect of the present embodiment. Also, in order to ensure the effect of this embodiment, it is preferable to set the upper limit of conditional expression (18) to 1.90, 1.80, and more preferably 1.75.
- conditional expression (18) is below the lower limit value in the variable magnification optical system of this embodiment, the lens closest to the image side cannot correct coma aberration appropriately. It becomes difficult to appropriately suppress fluctuations in various aberrations including coma aberration.
- the effects of the present embodiment can be made more reliable.
- the lower limit of conditional expression (18) is -11.75, -11.50, -11.25, -10.00, -7.50, - It is preferably set to 5.00, or even -3.00.
- the rear group has a negative focusing group that has negative refractive power and moves along the optical axis during focusing, and satisfies the following conditional expression: is preferred. (19) 0.75 ⁇ fN/fFN ⁇ 30.00 however, fN: focal length of the lens group with the weakest refractive power among the lens groups having negative refractive power in the rear group fFN: focal length of the negative focus group
- Conditional expression (19) defines the ratio between the focal length of the lens group with the weakest refractive power among the lens groups having negative refractive power in the rear group and the focal length of the negative focusing group.
- conditional expression (19) exceeds the upper limit in the variable-magnification optical system of this embodiment, the refractive power of the negative focus group becomes too strong, and fluctuations in various aberrations including spherical aberration occur during focusing. It becomes difficult to suppress appropriately.
- the upper limit of conditional expression (19) is set to 28.00, 27.00, 25.00, 20.00, 17.50, 15.00, 12. Preferably set to 25, 10.00, 7.50, 5.00 and even 3.50.
- conditional expression (19) in the variable-magnification optical system of the present embodiment is below the lower limit, the refractive power of the lens group having the weakest refractive power among the lens groups having negative refractive power in the rear group decreases. It becomes too strong, and it becomes difficult to appropriately suppress variations in various aberrations including spherical aberration during zooming.
- the effects of this embodiment can be made more reliable.
- variable magnification optical system of this embodiment satisfy the following conditional expression. (20) Fnot ⁇ 7.00 however, Fnot: F value of variable power optical system at telephoto end
- Conditional expression (20) defines the F value of the variable power optical system in the telephoto end state.
- the variable power optical system of the present embodiment can increase the amount of light taken in by the variable power optical system.
- the upper limit of conditional expression (20) is set to 7.90, 6.80, 6.70, 6.60, 6.00, 5.00, and further to 4 It is preferably set to .50.
- variable power optical system of the present embodiment it is preferable that the second lens group from the image side among the lens groups in the rear group is moved along the optical axis during focusing.
- variable power optical system of the present embodiment can appropriately suppress variations in various aberrations including spherical aberration during focusing.
- variable magnification optical system of this embodiment satisfy the following conditional expression. (21) 0.10 ⁇ Bfw/fw ⁇ 0.95 however, Bfw: Back focus at the wide-angle end of the variable power optical system fw: Focal length at the wide-angle end of the variable power optical system
- Conditional expression (21) defines the ratio of the back focus in the wide-angle end state of the variable power optical system to the focal length in the wide-angle end state of the variable power optical system.
- conditional expression (21) exceeds the upper limit in the variable power optical system of this embodiment, the back focus becomes too long, making it difficult to avoid an increase in the size of the optical system.
- the effects of the present embodiment can be made more reliable. Moreover, in order to ensure the effect of this embodiment, it is preferable to set the upper limit of conditional expression (21) to 0.90, 0.85, 0.80, and more preferably 0.75.
- conditional expression (21) in the variable power optical system of this embodiment falls below the lower limit, the position of the exit pupil will be too close to the image plane, and various aberrations including coma in the wide-angle end state will be satisfactorily corrected. It becomes difficult to correct to
- variable magnification optical system of this embodiment setting the lower limit of conditional expression (21) to 0.10 makes it possible to ensure the effects of this embodiment. Also, in order to ensure the effect of this embodiment, the lower limit of conditional expression (21) is set to 0.15, 0.20, 0.25, 0.30, 0.35, and further to 0.40. preferably.
- variable power optical system of the present embodiment it is preferable that the first lens group moves toward the object side when changing power from the wide-angle end state to the telephoto end state.
- variable power optical system of the present embodiment can be downsized while appropriately suppressing fluctuations in various aberrations including spherical aberration during power variation. can.
- the first lens group preferably consists of a negative lens and a positive lens in order from the object side.
- variable power optical system of the present embodiment can satisfactorily correct various aberrations including spherical aberration in the telephoto end state while reducing the weight of the variable power optical system.
- the first lens group preferably consists of a positive lens.
- variable power optical system of the present embodiment can satisfactorily correct various aberrations including spherical aberration in the telephoto end state while reducing the weight of the variable power optical system.
- the rear group preferably has a first focusing group and a second focusing group that respectively move along the optical axis during focusing.
- variable power optical system of the present embodiment can appropriately suppress variations in various aberrations including spherical aberration during focusing.
- variable magnification optical system of this embodiment satisfy the following conditional expression. (22) 0.20 ⁇
- Conditional expression (22) defines the ratio between the focal length of the first focusing group and the focal length of the second focusing group.
- conditional expression (22) exceeds the upper limit in the variable magnification optical system of the present embodiment, the refractive power of the second focusing group becomes too strong, and various aberrations including spherical aberration occur during focusing. It becomes difficult to appropriately suppress fluctuations.
- the effects of the present embodiment can be made more reliable.
- the upper limit of conditional expression (22) is set to 27.00, 25.00, 10.00, 2.00, 1.95, 1.90, 1. Preferably set to 85, 1.80 or even 1.75.
- conditional expression (22) is below the lower limit in the variable-magnification optical system of this embodiment, the refractive power of the first focusing group becomes too strong, causing various problems such as spherical aberration during zooming. It becomes difficult to appropriately suppress variations in aberration.
- variable magnification optical system of this embodiment setting the lower limit of conditional expression (22) to 0.20 makes it possible to ensure the effects of this embodiment. Also, in order to ensure the effect of this embodiment, the lower limit of conditional expression (22) is set to 0.25, 0.30, 0.35, 0.40, 0.45, and further to 0.50. preferably.
- At least one of the positive lenses in the rear group preferably satisfies the following first dispersion conditional expression. (23) ⁇ dP1 ⁇ 45.00 however, ⁇ dP1: Abbe number of the positive lens in the rear group with respect to the d-line
- the first dispersion conditional expression (23) defines the Abbe number of the positive lens in the rear group with respect to the d-line.
- the variable-magnification optical system of this embodiment can satisfactorily correct chromatic aberration by having a positive lens that satisfies the first dispersion conditional expression (23) in the rear group.
- the upper limit of the first dispersion conditional expression (23) is set to 43.00, 40.00, 35.00, 30.00, and further to 28.50. is preferred.
- the positive lens that satisfies the first dispersion conditional expression (23) is preferably included in the negative lens group having negative refractive power among the lens groups in the rear group. .
- variable power optical system of the present embodiment having such a configuration, chromatic aberration can be corrected more satisfactorily.
- At least one of the negative lenses in the rear group preferably satisfies the following second dispersion conditional expression. (24) 60.00 ⁇ vdN however, ⁇ dN: Abbe number of the negative lens in the rear group with respect to the d-line
- the second dispersion conditional expression (24) defines the Abbe number based on the d-line of the negative lens in the rear group.
- the variable-magnification optical system of this embodiment can satisfactorily correct chromatic aberration by having a negative lens that satisfies the second dispersion conditional expression (24).
- the effects of this embodiment can be made more reliable. Also, in order to ensure the effect of this embodiment, it is preferable to set the lower limit of the second dispersion conditional expression (24) to 62.50, 65.00, 67.50, and further to 75.00.
- the negative lens satisfying the second dispersion conditional expression (24) may be included in the final lens group arranged closest to the image side among the lens groups in the rear group. preferable.
- variable power optical system of the present embodiment having such a configuration, chromatic aberration can be corrected more satisfactorily.
- At least one of the lens groups having positive refractive power among the lens groups in the rear group may have a positive lens that satisfies the following third dispersion conditional expression. preferable. (25) 60.00 ⁇ vdP2 however, ⁇ dP2: Abbe number of the positive lens in the rear group with respect to the d-line
- the third dispersion conditional expression (25) defines the Abbe number of the positive lens in the rear group with respect to the d-line.
- the lens group having positive refractive power includes a positive lens that satisfies the third dispersion conditional expression (25), so that chromatic aberration can be corrected satisfactorily.
- variable magnification optical system of this embodiment setting the lower limit of the third dispersion conditional expression (25) to 60.00 makes it possible to ensure the effects of this embodiment. Also, in order to ensure the effects of this embodiment, it is preferable to set the lower limit of the third dispersion conditional expression (25) to 62.50, 65.00, 67.50, and further to 75.00.
- the optical apparatus of this embodiment has a variable power optical system with the above configuration. This makes it possible to realize an optical device with good optical performance.
- the method of manufacturing a variable power optical system has a plurality of lens groups of six or more groups.
- a method for manufacturing a variable power optical system comprising a rear group arranged on the side, wherein the distance between each lens group changes during zooming, and the first lens group is composed of two or more lenses. Arrange so that all the conditional expressions of are satisfied. (1) 8.00 ⁇ f1/D1 ⁇ 27.00 (2) 1.00 ⁇ M1/D1 ⁇ 12.00 however, f1: focal length of the first lens group D1: thickness of the first lens group on the optical axis M1: amount of movement of the first lens group during zooming from the wide-angle end state to the telephoto end state
- variable power optical system having good optical performance can be manufactured by such a method for manufacturing a variable power optical system.
- FIG. 1 is a cross-sectional view of the variable magnification optical system of the first embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a positive refractive power, a sixth lens group G6 having a positive refractive power, and a negative and a seventh lens group G7 having refractive power.
- the first lens group G1 is composed of, in order from the object side, a cemented positive lens constructed by cementing a negative meniscus lens L1 with a convex surface facing the object side and a positive meniscus lens L2 with a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side, a negative meniscus lens L3 having a convex surface facing the object side, a biconcave negative lens L4, a biconvex positive lens L5, and a concave surface facing the object side. and a negative meniscus lens L6.
- the third lens group G3 consists of a positive meniscus lens L7 with a convex surface facing the object side, and a biconvex positive lens L8.
- the fourth lens group G4 is composed of a cemented positive lens constructed by, in order from the object side, a negative meniscus lens L9 having a convex surface facing the object side cemented with a biconvex positive lens L10.
- the fifth lens group G5 consists of, in order from the object side, a negative meniscus lens L11 with a concave surface facing the object side, and a biconvex positive lens L12.
- the sixth lens group G6 consists of a positive meniscus lens L13 with a concave surface facing the object side.
- the seventh lens group G7 consists of, in order from the object side, a positive meniscus lens L14 with a concave surface facing the object side, a biconcave negative lens L15, and a negative meniscus lens L16 with a concave surface facing the object side.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 and the sixth lens group G6 along the optical axis.
- the fifth lens group G5 and the sixth lens group G6 are moved from the image side to the object side.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 are placed in the rear group.
- the seventh lens group G7 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- Group G7 corresponds to the second negative lens group.
- the fifth lens group G5 corresponds to the first focusing group
- the sixth lens group G6 corresponds to the second focusing group
- the fifth lens group G5 and the sixth lens group G6 correspond to positive focusing groups. do.
- Table 1 below lists the values of the specifications of the variable-magnification optical system of this embodiment.
- fw is the focal length at the wide-angle end of the variable magnification optical system
- ft is the focal length at the telephoto end of the variable magnification optical system
- Fnow is the F value at the wide-angle end of the variable magnification optical system
- Fnot is the variable magnification. Shows the F-number at the wide-angle end of the optical system.
- TL indicates the total optical length of the variable power optical system when focusing on an infinitely distant object in the wide-angle end state
- Bf indicates the back focus of the variable power optical system.
- m is the order of the optical surfaces counted from the object side
- r is the radius of curvature
- d is the surface spacing
- nd is the refractive index for the d-line (wavelength 587.6 nm)
- ⁇ d is the Abbe number for the d-line.
- optical surfaces marked with "*" are aspheric surfaces.
- lenses corresponding to the positive lens P1 in the conditional expression (23), the negative lens N in the conditional expression (24), and the positive lens P2 in the conditional expression (25) are shown.
- m is the optical surface corresponding to the aspheric data
- K is the conic constant
- A4 to A14 are the aspheric coefficients.
- the height of the aspherical surface in the direction perpendicular to the optical axis is y, and the distance (sag) along the optical axis from the tangent plane of the vertex of each aspherical surface to each aspherical surface at height y is S(y) where r is the radius of curvature (paraxial radius of curvature) of the reference spherical surface, K is the conic constant, and An is the n-th order aspheric coefficient. In each example, the second-order aspheric coefficient A2 is zero. Also, "En” indicates " ⁇ 10 -n ".
- variable power optical system is not limited to this because equivalent optical performance can be obtained even if proportional enlargement or proportional reduction is performed.
- FIG. 2A is a diagram showing various aberrations when focusing on an object at infinity in the wide-angle end state of the variable power optical system of the first embodiment
- FIG. FIG. 2C is a diagram of various aberrations when focusing on an object
- FIG. 2C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the first embodiment.
- FNO indicates the F-number and Y indicates the image height.
- the spherical aberration diagram shows the F-number 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.
- d indicates the d-line
- g indicates the g-line (wavelength 435.8 nm).
- a solid line indicates a sagittal image plane
- a broken line indicates a meridional image plane.
- the same reference numerals as in the aberration diagrams of this embodiment are used.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 3 is a cross-sectional view of the variable power optical system of the second embodiment when focusing on an object at the wide-angle end.
- variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. , a fourth lens group G4 having positive refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having negative refractive power ing.
- the first lens group G1 is composed of, in order from the object side, a cemented positive lens constructed by cementing a negative meniscus lens L1 with a convex surface facing the object side and a positive meniscus lens L2 with a convex surface facing the object side.
- the second lens group G2 consists of, in order from the object side, a negative meniscus lens L3 with a convex surface facing the object side, a biconcave negative lens L4, and a biconvex positive lens L5.
- the third lens group G3 comprises, in order from the object side, a positive meniscus lens L6 having a convex surface facing the object side, and a cemented positive lens constructed by a negative meniscus lens L7 having a convex surface facing the object side cemented with a biconvex positive lens L8. , a cemented negative lens of a biconcave negative lens L9 and a biconvex positive lens L10.
- the fourth lens group G4 consists of, in order from the object side, a negative meniscus lens L11 with a concave surface facing the object side, and a biconvex positive lens L12.
- the fifth lens group G5 consists of a biconcave negative lens L13.
- the sixth lens group G6 consists of a biconcave negative lens L14.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- a filter FL1 is arranged between the optical system and the image plane I of this embodiment.
- variable magnification optical system of this embodiment performs focusing by moving the fourth lens group G4 and the fifth lens group G5 along the optical axis.
- the fourth lens group G4 is moved from the image side to the object side
- the fifth lens group G5 is moved from the object side to the image side.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the rear group.
- Group G6 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- the fifth lens corresponds to the second negative lens group
- the fourth lens group G4 corresponds to the first focus group and the positive focus group
- the fifth lens group G5 corresponds to the second focus group and the negative focus group.
- Table 2 below lists the values of the specifications of the variable-magnification optical system of this embodiment.
- Bfw indicates the back focus of the variable-magnification optical system in the wide-angle end state
- Bft indicates the back focus of the variable-magnification optical system in the telephoto end state.
- FIG. 4A is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the second embodiment
- FIG. FIG. 4C is a diagram of various aberrations when focusing on an object
- FIG. 4C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the second embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 5 is a cross-sectional view of the variable magnification optical system of the third embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, a sixth lens group G6 having a positive refractive power, and a negative and a seventh lens group G7 having refractive power.
- the first lens group G1 consists of a positive meniscus lens L1 with a convex surface facing the object side.
- the second lens group G2 comprises, in order from the object side, a plano-concave negative lens L2 with a concave surface facing the image side, a negative meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens with a convex surface facing the object side. It consists of a positive lens cemented with L4 and a negative meniscus lens L5 with a concave surface facing the object side.
- the third lens group G3 consists of, in order from the object side, a biconvex positive lens L6, a positive meniscus lens L7 with a convex surface facing the object side, and a negative meniscus lens L8 with a concave surface facing the object side.
- the fourth lens group G4 consists of, in order from the object side, a biconvex positive lens L9 and a cemented positive lens constructed by a negative meniscus lens L10 having a convex surface facing the object side cemented with a biconvex positive lens L11.
- the fifth lens group G5 consists of a negative meniscus lens L12 with a convex surface facing the object side.
- the sixth lens group G6 consists of, in order from the object side, a biconvex positive lens L13 and a biconvex positive lens L14.
- the seventh lens group G7 consists of a biconcave negative lens L15.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 along the optical axis.
- the fifth lens group G5 is moved from the object side to the image side when focusing on a short-distance object from a state focused on infinity.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 are placed in the rear group.
- the seventh lens group G7 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- the fifth lens corresponds to the second negative lens group.
- the fifth lens group G5 corresponds to a negative focusing group.
- Table 3 below lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 6A is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the third embodiment
- FIG. FIG. 6C is a diagram of various aberrations when focusing on an object
- FIG. 6C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the third embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 7 is a cross-sectional view of the variable power optical system of the fourth embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power.
- a third lens group G3 having a positive refractive power a fourth lens group G4 having a positive refractive power
- a fifth lens group G5 having a negative refractive power a sixth lens group G6 having a positive refractive power
- a positive It has a seventh lens group G7 having refractive power and an eighth lens group G8 having negative refractive power.
- the first lens group G1 consists of a positive meniscus lens with a convex surface facing the object side.
- the second lens group G2 comprises, in order from the object side, a plano-concave negative lens L2 with a concave surface facing the image side, a negative meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens with a convex surface facing the object side. It consists of a positive lens cemented with L4 and a negative meniscus lens L5 with a concave surface facing the object side.
- the third lens group G3 consists of, in order from the object side, a positive meniscus lens L6 with a convex surface facing the object side, a biconvex positive lens L7, and a negative meniscus lens L8 with a concave surface facing the object side.
- the fourth lens group G4 consists of, in order from the object side, a biconvex positive lens L9 and a cemented positive lens constructed by a negative meniscus lens L10 having a convex surface facing the object side cemented with a biconvex positive lens L11.
- the fifth lens group G5 consists of a negative meniscus lens L12 with a convex surface facing the object side.
- the sixth lens group G6 consists of a biconvex positive lens L13.
- the seventh lens group G7 consists of a biconvex positive lens L14.
- the eighth lens group G8 consists of a biconcave negative lens L15.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 and the sixth lens group G6 along the optical axis.
- the fifth lens group G5 is moved from the object side to the image side
- the sixth lens group G6 is moved from the image side to the object side.
- the group G8 corresponds to the rear group
- the eighth lens group G8 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- Group G5 corresponds to the second negative lens group
- the fifth lens group G5 corresponds to the first focus group and the negative focus group
- the sixth lens group G6 corresponds to the second focus group and the positive focus group.
- Table 4 below lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 8A is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the fourth embodiment
- FIG. FIG. 8C is a diagram of various aberrations when focusing on an object
- FIG. 8C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the fourth embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 9 is a cross-sectional view of the variable power optical system of the fifth embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a positive refractive power, a sixth lens group G6 having a positive refractive power, and a negative and a seventh lens group G7 having refractive power.
- the first lens group G1 is composed of, in order from the object side, a cemented positive lens constructed by cementing a negative meniscus lens L1 with a convex surface facing the object side and a positive meniscus lens L2 with a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side, a negative meniscus lens L3 having a convex surface facing the object side, a biconcave negative lens L4, a biconvex positive lens L5, and a concave surface facing the object side. and a negative meniscus lens L6.
- the third lens group G3 consists of, in order from the object side, a positive meniscus lens L7 with a convex surface facing the object side and a positive meniscus lens L8 with a convex surface facing the object side.
- the fourth lens group G4 comprises, in order from the object side, a biconvex positive lens L9, a cemented negative lens composed of a negative meniscus lens L10 having a convex surface facing the object side, and a positive meniscus lens L11 having a convex surface facing the object side.
- the fifth lens group G5 consists of, in order from the object side, a negative meniscus lens L12 with a concave surface facing the object side, and a biconvex positive lens L13.
- the sixth lens group G6 consists of a positive meniscus lens L14 with a concave surface facing the object side.
- the seventh lens group G7 is composed of, in order from the object side, a cemented negative lens constructed by a biconcave negative lens L15 cemented with a positive meniscus lens L16 having a convex surface facing the object side.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 and the sixth lens group G6 along the optical axis.
- the fifth lens group G5 and the sixth lens group G6 are moved from the image side to the object side.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 are placed in the rear group.
- the seventh lens group G7 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- Group G7 corresponds to the second negative lens group.
- the fifth lens group G5 corresponds to the first focusing group
- the sixth lens group G6 corresponds to the second focusing group
- the fifth lens group G5 and the sixth lens group G6 correspond to positive focusing groups. do.
- Table 5 lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 10A is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable-magnification optical system of the fifth embodiment
- FIG. FIG. 10C is a diagram of various aberrations when focusing on an object
- FIG. 10C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable magnification optical system of the fifth embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 11 is a cross-sectional view of the variable power optical system of the sixth embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. a third lens group G3 having a negative refractive power, a fourth lens group G4 having a negative refractive power, a fifth lens group G5 having a positive refractive power, a sixth lens group G6 having a negative refractive power, and a positive and a seventh lens group G7 having refractive power.
- the first lens group G1 is composed of a positive lens cemented with a negative meniscus lens L1 having a convex surface facing the object side and a biconvex positive lens L2 in order from the object side.
- the second lens group G2 includes, in order from the object side, a negative lens cemented by a negative meniscus lens L3 having a convex surface facing the object side and a negative meniscus lens L4 having a convex surface facing the object side, and a biconcave negative lens L5. It consists of a positive lens cemented with a biconvex positive lens L6 and a negative meniscus lens L7 having a concave surface facing the object side.
- the third lens group G3 consists of, in order from the object side, a biconvex positive lens L8 and a biconvex positive lens L9.
- the fourth lens group G4 includes, in order from the object side, a negative lens cemented by a biconcave negative lens L10 cemented with a positive meniscus lens L11 having a convex surface facing the object side, and a positive meniscus lens L12 having a convex surface facing the object side.
- the fifth lens group G5 includes, in order from the object side, a biconvex positive lens L13, a cemented negative lens composed of a biconvex positive lens L14 cemented with a biconcave negative lens L15, and a convex surface facing the object side. It consists of a cemented negative lens of a negative meniscus lens L16 and a biconvex positive lens L17, and a biconvex positive lens L18.
- the sixth lens group G6 consists of, in order from the object side, a positive meniscus lens L19 with a concave surface facing the object side, and a biconcave negative lens L20.
- the seventh lens group G7 consists of a positive meniscus lens L21 with a convex surface facing the object side.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the sixth lens group G6 along the optical axis.
- the sixth lens group G6 is moved from the object side to the image side when focusing on a short-distance object from a state focused on infinity.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 are placed in the rear group.
- the seventh lens group G7 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second negative lens group
- the fifth lens corresponds to the second positive lens group.
- the sixth lens group G6 corresponds to a negative focus group.
- Table 6 lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 12A is a diagram showing various aberrations when focusing on an object at infinity in the wide-angle end state of the variable power optical system of the sixth embodiment
- FIG. FIG. 12C is a diagram of various aberrations when focusing on an object
- FIG. 12C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the sixth embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 13 is a cross-sectional view of the variable power optical system of the seventh embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power.
- a third lens group G3 having a positive refractive power a fourth lens group G4 having a positive refractive power
- a fifth lens group G5 having a negative refractive power a sixth lens group G6 having a positive refractive power
- a positive It has a seventh lens group G7 having refractive power and an eighth lens group G8 having negative refractive power.
- the first lens group G1 consists of a positive meniscus lens L1 with a convex surface facing the object side.
- the second lens group G2 comprises, in order from the object side, a biconcave negative lens L2, a cemented positive lens composed of a negative meniscus lens L3 having a convex surface facing the object side and a positive meniscus lens L4 having a convex surface facing the object side. , and a negative meniscus lens L5 having a concave surface facing the object side.
- the third lens group G3 consists of, in order from the object side, a biconvex positive lens L6, a positive meniscus lens L7 with a convex surface facing the object side, and a negative meniscus lens L8 with a concave surface facing the object side.
- the fourth lens group G4 consists of, in order from the object side, a biconvex positive lens L9 and a cemented positive lens constructed by a negative meniscus lens L10 having a convex surface facing the object side cemented with a biconvex positive lens L11.
- the fifth lens group G5 consists of a negative meniscus lens L12 with a convex surface facing the object side.
- the sixth lens group G6 consists of, in order from the object side, a biconvex positive lens L13 and a negative meniscus lens L14 having a convex surface facing the object side.
- the seventh lens group G7 consists of a biconvex positive lens L15.
- the eighth lens group G8 consists of a biconcave negative lens L16.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 and the seventh lens group G7 along the optical axis.
- the fifth lens group G5 is moved from the object side to the image side
- the seventh lens group G7 is moved from the image side to the object side.
- the group G8 corresponds to the rear group
- the eighth lens group G8 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- Group G5 corresponds to the second negative lens group
- the fifth lens group G5 corresponds to the first focus group and the negative focus group
- the seventh lens group G7 corresponds to the second focus group and the positive focus group.
- Table 7 lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 14A is a diagram showing various aberrations when focusing on an object at infinity in the wide-angle end state of the variable magnification optical system of the seventh embodiment
- FIG. FIG. 14C is a diagram of various aberrations when focusing on an object
- FIG. 14C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the zoom optical system of the seventh embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 15 is a cross-sectional view of the variable power optical system of the eighth embodiment when focusing on an object at the wide-angle end.
- variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. , a fourth lens group G4 having positive refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having negative refractive power ing.
- the first lens group G1 is composed of, in order from the object side, a cemented positive lens constructed by cementing a negative meniscus lens L1 with a convex surface facing the object side and a positive meniscus lens L2 with a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side, a negative meniscus lens L3 with a convex surface facing the object side, a biconcave negative lens L4, a biconvex positive lens L5, and a biconcave negative lens L6. Consists of
- the third lens group G3 includes, in order from the object side, a biconvex positive lens L7, a cemented positive lens constructed by a negative meniscus lens L8 having a convex surface facing the object side and a biconvex positive lens L9, and a and a negative meniscus lens L10 with a concave surface.
- the fourth lens group G4 includes, in order from the object side, a positive lens cemented by a biconvex positive lens L11 cemented with a negative meniscus lens L12 having a concave surface facing the object side, and a negative meniscus lens L13 having a convex surface facing the object side. It consists of a cemented positive lens with a biconvex positive lens L14.
- the fifth lens group G5 is composed of a cemented negative lens constructed by cementing a biconvex positive lens L15 and a biconcave negative lens L16 in order from the object side.
- the sixth lens group G6 consists of, in order from the object side, a biconcave negative lens L17 and a biconvex positive lens L18.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 along the optical axis.
- the fifth lens group G5 is moved from the object side to the image side when focusing on a short-distance object from a state focused on infinity.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the rear group.
- Group G6 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- the fifth lens corresponds to the second negative lens group.
- the fifth lens group G5 corresponds to a negative focusing group.
- Table 8 below lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 16A is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable power optical system of the eighth embodiment
- FIG. FIG. 16C is a diagram of various aberrations when focusing on an object
- FIG. 16C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the eighth embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 17 is a sectional view of the variable power optical system of the ninth embodiment when focusing on an object at the wide-angle end.
- variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. , a fourth lens group G4 having positive refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having negative refractive power ing.
- the first lens group G1 is composed of a cemented positive lens composed of, in order from the object side, a negative meniscus lens L1 having a convex surface facing the object side and a positive meniscus lens L2 having a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side, a negative meniscus lens L3 with a convex surface facing the object side, a biconcave negative lens L4, a biconvex positive lens L5, and a biconcave negative lens L6. Consists of
- the third lens group G3 includes, in order from the object side, a biconvex positive lens L7, a cemented positive lens constructed by a negative meniscus lens L8 having a convex surface facing the object side and a biconvex positive lens L9, and a and a negative meniscus lens L10 with a concave surface.
- the fourth lens group G4 includes, in order from the object side, a positive lens cemented by a biconvex positive lens L11 cemented with a negative meniscus lens L12 having a concave surface facing the object side, and a negative meniscus lens L13 having a convex surface facing the object side. It consists of a cemented positive lens with a biconvex positive lens L14.
- the fifth lens group G5 is composed of a cemented negative lens constructed by cementing a biconvex positive lens L15 and a biconcave negative lens L16 in order from the object side.
- the sixth lens group G6 consists of, in order from the object side, a biconcave negative lens L17 and a biconvex positive lens L18.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fourth lens group G4 and the fifth lens group G5 along the optical axis.
- the fourth lens group G4 and the fifth lens group G5 are moved from the object side to the image side.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the rear group.
- Group G6 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- the fifth lens corresponds to the second negative lens group
- the fourth lens group G4 corresponds to the first focus group and the positive focus group
- the fifth lens group G5 corresponds to the second focus group and the negative focus group.
- Table 9 lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 18A is a diagram showing various aberrations when focusing on an object at infinity in the wide-angle end state of the variable power optical system of the ninth embodiment
- FIG. FIG. 18C is a diagram of various aberrations when focusing on an object
- FIG. 18C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the ninth embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 19 is a cross-sectional view of the variable magnification optical system of the tenth embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, a sixth lens group G6 having a negative refractive power, and a positive and a seventh lens group G7 having refractive power.
- the first lens group G1 is composed of, in order from the object side, a cemented positive lens constructed by cementing a negative meniscus lens L1 with a convex surface facing the object side and a positive meniscus lens L2 with a convex surface facing the object side.
- the second lens group G2 consists of, in order from the object side, a negative meniscus lens L3 with a convex surface facing the object side, and a cemented positive lens constructed by a biconcave negative lens L4 cemented with a positive meniscus lens L5 with a convex surface facing the object side. , and a negative meniscus lens L6 having a concave surface facing the object side.
- the third lens group G3 consists of, in order from the object side, a positive meniscus lens L7 with a convex surface facing the object side and a positive meniscus lens L8 with a convex surface facing the object side.
- the fourth lens group G4 includes, in order from the object side, a positive lens cemented with a negative meniscus lens L9 having a convex surface facing the object side and a positive meniscus lens L10 having a convex surface facing the object side, and a biconvex positive lens L11. It consists of a negative lens cemented with a negative meniscus lens L12 having a concave surface facing the object side, and a biconvex positive lens L13.
- the fifth lens group G5 consists of, in order from the object side, a positive meniscus lens L14 with a concave surface facing the object side, and a biconcave negative lens L15.
- the sixth lens group G6 consists of a biconcave negative lens L16.
- the seventh lens group G7 consists of a positive meniscus lens L17 with a convex surface facing the object side.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 and the sixth lens group G6 along the optical axis.
- the fifth lens group G5 and the sixth lens group G6 are moved from the object side to the image side.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 are placed in the rear group.
- the seventh lens group G7 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second positive lens group
- Group G5 corresponds to the second negative lens group.
- the fifth lens group G5 corresponds to the first focusing group
- the sixth lens group G6 corresponds to the second focusing group
- the fifth lens group G5 and the sixth lens group G6 correspond to the negative focusing group. do.
- Table 10 lists the values of the specifications of the variable-magnification optical system of this example.
- FIG. 20A is a diagram of various aberrations when focusing on an object at infinity in the wide-angle end state of the variable power optical system of the tenth embodiment
- FIG. FIG. 20C is a diagram of various aberrations when focusing on an object
- FIG. 20C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable power optical system of the tenth embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- FIG. 21 is a cross-sectional view of the variable power optical system of the eleventh embodiment when focusing on an object at the wide-angle end.
- the variable magnification optical system of this embodiment includes, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, an aperture stop S, and a positive refractive power. a third lens group G3 having a negative refractive power, a fourth lens group G4 having a negative refractive power, a fifth lens group G5 having a positive refractive power, a sixth lens group G6 having a positive refractive power, and a negative and a seventh lens group G7 having refractive power.
- the first lens group G1 is composed of a positive lens cemented with a negative meniscus lens L1 having a convex surface facing the object side and a biconvex positive lens L2 in order from the object side.
- the second lens group G2 consists of, in order from the object side, a biconcave negative lens L3, a biconcave negative lens L4, a biconvex positive lens L5, and a biconcave negative lens L6.
- the third lens group G3 comprises, in order from the object side, a biconvex positive lens L7, a cemented negative lens composed of a negative meniscus lens L8 having a convex surface facing the object side and a positive meniscus lens L9 having a convex surface facing the object side.
- the fourth lens group G4 consists of, in order from the object side, a biconvex positive lens L10, and a cemented negative lens constructed by a biconcave negative lens L11 cemented with a positive meniscus lens L12 having a convex surface facing the object side.
- the fifth lens group G5 is composed of, in order from the object side, a cemented positive lens constructed by cementing a negative meniscus lens L13 with a convex surface facing the object side and a positive meniscus lens L14 with a convex surface facing the object side.
- the sixth lens group G6 consists of a biconvex positive lens L15.
- the seventh lens group G7 consists of, in order from the object side, a biconcave negative lens L16, a biconvex positive lens L17, and a plano-concave negative lens L18 with a concave surface facing the object side.
- an imaging device (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
- variable magnification optical system of this embodiment performs focusing by moving the fifth lens group G5 and the sixth lens group G6 along the optical axis.
- the fifth lens group G5 and the sixth lens group G6 are moved from the image side to the object side.
- the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 are placed in the rear group.
- the seventh lens group G7 corresponds to the final lens group.
- the second lens group G2 corresponds to the first negative lens group
- the third lens group G3 corresponds to the first positive lens group
- the fourth lens group G4 corresponds to the second negative lens group
- Group G5 corresponds to the second positive lens group.
- the fifth lens group G5 corresponds to the first focusing group
- the sixth lens group G6 corresponds to the second focusing group
- the fifth lens group G5 and the sixth lens group G6 correspond to positive focusing groups. do.
- Table 11 below lists the values of the specifications of the variable-magnification optical system of this embodiment.
- FIG. 22A is a diagram showing various aberrations when focusing on an object at infinity in the wide-angle end state of the variable power optical system of the eleventh embodiment
- FIG. FIG. 22C is a diagram of various aberrations when focusing on an object
- FIG. 22C is a diagram of various aberrations when focusing on an object at infinity in the telephoto end state of the variable magnification optical system of the eleventh embodiment.
- variable-power optical system of this example effectively suppresses aberration fluctuations during focusing and variable magnification, and has high optical performance.
- f1 is the focal length of the first lens group
- D1 is the thickness of the first lens group on the optical axis
- M1 is the amount of movement of the first lens group when zooming from the wide-angle end state to the telephoto end state.
- fN1 is the focal length of the first negative lens group
- fN2 is the focal length of the second negative lens group
- fP1 is the focal length of the first positive lens group
- fP2 is the focal length of the second positive lens group.
- MP1 is the amount of movement of the first positive lens group when zooming from the wide-angle end to the telephoto end
- MN1 is the amount of movement of the first negative lens group when zooming from the wide-angle end to the telephoto end. be.
- fFP is the focal length of the positive focus group
- fRPw is the composite focal length in the wide-angle end state of the lens groups arranged closer to the image side than the positive focus group
- fFN is the focal length of the negative focus group
- fRNw is the composite focal length in the wide-angle end state of the lens groups arranged closer to the image side than the negative focus group
- fR is the focal length of the final lens group.
- nd1 is the refractive index of the lens in the first lens group for the d-line
- ⁇ d1 is the Abbe number of the lens in the first lens group with respect to the d-line.
- r1 is the radius of curvature of the object-side lens surface of the lens closest to the image side
- r2 is the radius of curvature of the image-side lens surface of the lens closest to the image side
- fN is the focal length of the lens group having the weakest refractive power among the lens groups having negative refractive power in the rear group
- Fnot is the F value of the variable magnification optical system in the telephoto end state.
- Bfw is the back focus in the wide-angle end state of the variable power optical system
- fw is the focal length in the wide-angle end state of the variable power optical system.
- fF1 is the focal length of the first focusing group and fF2 is the focal length of the second focusing group.
- ⁇ dP1 is the Abbe number of the positive lens in the rear group with respect to the d-line
- ⁇ dN is the Abbe number of the negative lens in the rear group with respect to the d-line
- ⁇ dP2 is the d-line of the positive lens in the rear group. It is the Abbe number with reference to the line.
- Example 7th 8th 9th 10th 11th (1) f1/D1: 26.049 9.548 9.548 10.302 9.345 (2) M1/D1: 10.323 5.387 5.387 5.957 5.461 (3) f1/(-fN1): 5.429 6.554 6.554 5.914 5.639 (4) f1/(-fN2): 2.355 2.347 2.347 0.130 0.375 (5) fN1/fN2 : 0.434 0.358 0.358 0.022 0.067 (6) f1/fP1: 1.608 1.855 1.855 2.771 2.929 (7) fP1/(-fN1): 3.376 3.532 3.532 2.134 1.926 (8) MP1/MN1: 3.071 2.674 2.674 1.974 2.455 (9) fP1/fP2: 2.670 2.198 2.198 1.082 0.866 (10) f1/fFP: 1.744 - 4.078 - 2.537 1.554 (11) fFP
- an antireflection film having high transmittance in a wide wavelength range may be applied to the lens surfaces of the lenses constituting the variable power optical system of each of the above embodiments. As a result, flare and ghost can be reduced, and optical performance with high contrast can be achieved.
- FIG. 23 is a schematic diagram of a camera equipped with the variable magnification optical system of this embodiment.
- the camera 1 is a lens interchangeable so-called mirrorless camera equipped with the variable magnification optical system according to the first embodiment as the taking lens 2 .
- the camera 1 In the camera 1 , light from an object (subject) (not shown) is condensed by the photographing lens 2 and reaches the imaging device 3 .
- the imaging device 3 converts light from a subject into image data. Image data is displayed on the electronic viewfinder 4 .
- the photographer whose eyes are positioned at the eyepoint EP can observe the subject.
- variable power optical system of the first embodiment mounted as the taking lens 2 in the camera 1 is a variable power optical system having good optical performance. Therefore, the camera 1 can achieve good optical performance. It should be noted that the same effect as that of the camera 1 can be obtained even if a camera equipped with the variable power optical system of the second to eleventh embodiments as the photographing lens 2 is constructed.
- FIG. 24 is a flow chart showing an outline of the method for manufacturing the variable-magnification optical system of this embodiment.
- the manufacturing method of the variable power optical system of this embodiment shown in FIG. 24 includes the following steps S1 to S4.
- Step S1 Prepare a plurality of lens groups of six or more groups, each consisting of a first lens group having a positive refractive power and a rear group arranged closer to the image side than the first lens group.
- Step S2 The distance between each lens group is changed during zooming.
- Step S3 Configure the first lens group with two or less lenses.
- Step S4 Make the variable magnification optical system satisfy all of the following conditional expressions. (1) 8.00 ⁇ f1/D1 ⁇ 27.00 (2) 1.00 ⁇ M1/D1 ⁇ 12.00 however, f1: focal length of the first lens group D1: thickness of the first lens group on the optical axis M1: amount of movement of the first lens group during zooming from the wide-angle end state to the telephoto end state
- variable magnification optical system having good imaging performance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Description
8.00 < f1/D1 < 27.00
1.00 < M1/D1 < 12.00
但し、
f1 : 第1レンズ群の焦点距離
D1 : 第1レンズ群の光軸上の厚み
M1 : 広角端状態から望遠端状態への変倍の際の第1レンズ群の移動量
8.00 < f1/D1 < 27.00
1.00 < M1/D1 < 12.00
但し、
f1 : 第1レンズ群の焦点距離
D1 : 第1レンズ群の光軸上の厚み
M1 : 広角端状態から望遠端状態への変倍時の第1レンズ群の移動量
(1) 8.00 < f1/D1 < 27.00
(2) 1.00 < M1/D1 < 12.00
但し、
f1 : 第1レンズ群の焦点距離
D1 : 第1レンズ群の光軸上の厚み
M1 : 広角端状態から望遠端状態への変倍の際の第1レンズ群の移動量
(3)1.00 < f1/(-fN1) < 8.00
但し、
fN1 : 第1負レンズ群の焦点距離
(4)0.10 < f1/(-fN2) < 5.00
但し、
fN2 : 第2負レンズ群の焦点距離
(5)0.01 < fN1/fN2 < 1.00
但し、
fN1 : 第1負レンズ群の焦点距離
fN2 : 第2負レンズ群の焦点距離
(6)0.75 < f1/fP1 < 5.00
但し、
fP1 : 第1正レンズ群の焦点距離
(7) 0.75 < fP1/(-fN1) < 4.50
但し、
fP1 : 第1正レンズ群の焦点距離
fN1 : 第1負レンズ群の焦点距離
(8) 1.00 < MP1/MN1 < 20.00
但し、
MP1 : 広角端状態から望遠端状態への変倍時の第1正レンズ群の移動量
MN1 : 広角端状態から望遠端状態への変倍時の第1負レンズ群の移動量
(9) 0.25 < fP1/fP2 < 3.50
但し、
fP1 : 第1正レンズ群の焦点距離
fP2 : 第2正レンズ群の焦点距離
(10) 0.75 < f1/fFP < 4.50
但し、
fFP : 正合焦群の焦点距離
(11) -3.50 < fFP/fRPw < -0.50
但し、
fFP : 正合焦群の焦点距離
fRPw: 正合焦群より像側に配置されたレンズ群の広角端状態における合成焦点距離
(12) 0.10 < f1/(-fFN) < 4.00
但し、
fFN : 負合焦群の焦点距離
(13) -25.00 < (-fFN)/fRNw < 1.00
但し、
fFN : 負合焦群の焦点距離
fRNw: 負合焦群より像側に配置されたレンズ群の広角端状態における合成焦点距離
(14) 0.10 < f1/(-fR) < 5.00
但し、
fR : 最終レンズ群の焦点距離
(15) 0.10 < f1/fR < 1.50
但し、
fR : 最終レンズ群の焦点距離
(16) 1.45 < nd1 < 2.10
(17) 20.00 < νd1 < 75.00
但し、
nd1 : 第1レンズ群内のレンズのd線に対する屈折率
νd1 : 第1レンズ群内のレンズのd線を基準とするアッベ数
(18) -12.00 < (r2-r1)/(r2+r1) < 2.00
但し、
r1 : 最も像側に配置されたレンズの物体側のレンズ面の曲率半径
r1 : 最も像側に配置されたレンズの像側のレンズ面の曲率半径
(19) 0.75 < fN/fFN < 30.00
但し、
fN : 後群内の負の屈折力を有するレンズ群のうち最も屈折力が弱いレンズ群の焦点距離
fFN : 負合焦群の焦点距離
(20) Fnot < 7.00
但し、
Fnot : 望遠端状態における変倍光学系のF値
(21) 0.10 < Bfw/fw < 0.95
但し、
Bfw : 変倍光学系の広角端状態におけるバックフォーカス
fw : 変倍光学系の広角端状態における焦点距離
(22) 0.20 < |fF1|/|fF2| < 30.00
但し、
fF1 : 第1合焦群の焦点距離
fF2 : 第2合焦群の焦点距離
(23) νdP1 < 45.00
但し、
νdP1 : 後群内の正レンズのd線を基準とするアッベ数
(24) 60.00 < νdN
但し、
νdN : 後群内の負レンズのd線を基準とするアッベ数
(25) 60.00 < νdP2
但し、
νdP2 : 後群内の正レンズのd線を基準とするアッベ数
(1)8.00 < f1/D1 < 27.00
(2)1.00 < M1/D1 < 12.00
但し、
f1 : 第1レンズ群の焦点距離
D1 : 第1レンズ群の光軸上の厚み
M1 : 広角端状態から望遠端状態への変倍時の第1レンズ群の移動量
以下、本願の実施例を図面に基づいて説明する。
図1は、広角端状態における無限遠物体合焦時の第1実施例の変倍光学系の断面図である。
+ A4×y4 + A6×y6 + A8×y8 + A10×y10 + A12×y12 + A14×y14
[全体諸元]
fw 24.75
ft 67.90
Fnow 2.92
Fnot 2.92
[レンズ諸元]
m r d nd νd (23) (24) (25)
1) 63.844 2.500 1.854505 25.15
2) 43.986 8.128 1.816000 46.59
3) 142.193 d3
* 4) 296.632 2.000 1.743890 49.53
5) 19.447 9.683
6) -100.452 1.300 1.834810 42.73 P1
7) 55.939 0.394
8) 38.386 6.222 1.728250 28.38
9) -56.749 2.082
10) -28.124 1.300 1.593490 67.00 N
11) -72.000 d11
12> ∞ 2.257 (開口絞り)
*13) 45.234 2.437 1.820980 42.50 P1
14) 60.836 0.297
15) 39.871 5.325 1.593190 67.90 P2
16) -156.624 d16
17) 58.428 1.300 1.737999 32.33
18) 19.539 9.700 1.497820 82.57 P2
19) -57.826 d19
20) -24.303 1.200 1.720467 34.71
21) -64.092 0.200
22) 86.286 6.081 1.593490 67.00 P2
23) -33.001 d23
24) -72.398 2.669 1.791890 45.04
*25) -38.022 d25
26) -44.000 3.018 1.945944 17.98
27) -32.214 0.200
*28) -84.205 1.500 1.816000 46.59
29) 107.497 7.335
30) -26.834 1.400 1.592700 35.27
31) -54.107 Bf
[非球面データ]
m K A4 A6 A8 A10 A12
4) 0.0000 5.67E-06 -6.48E-09 1.59E-11 -2.46E-14 1.99E-17
13) 0.0000 -3.46E-06 2.89E-09 -1.52E-11 2.39E-14
25) 0.0000 1.23E-05 -1.23E-08 2.75E-11 3.33E-14 -1.60E-16
28) 0.0000 -2.18E-06 -1.57E-08 -1.32E-11 1.50E-14
[各群焦点距離データ]
群 始面 焦点距離
G1 1 138.68
G2 4 -24.42
G3 13 43.63
G4 17 111.65
G5 20 124.10
G6 24 97.77
G7 26 -47.85
[可変間隔データ]
広角端状態 望遠端状態
d3 1.800 32.239
d11 22.304 2.000
d16 8.637 1.500
d19 5.489 19.095
d23 3.541 2.935
d25 5.473 2.073
Bf 11.855 28.555
図3は、広角端状態における無限遠物体合焦時の第2実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.84
ft 67.00
Fnow 4.10
Fnot 4.10
Bfw 12.06
Bft 37.58
[レンズ諸元]
m r d nd νd (23) (24) (25)
1) 67.159 1.200 1.846660 23.80
2) 45.296 8.873 1.755000 52.34
3) 304.642 d3
4) 127.887 1.919 1.743890 49.53
* 5) 15.932 14.912
6) -57.698 1.500 1.755000 52.34
7) 199.334 1.013
8) 69.130 3.648 2.000690 25.46 P1
9) -155.105 d9
10> ∞ 1.500 (開口絞り)
*11) 19.502 5.108 1.553319 71.68 P2
12) 441.866 0.254
13) 58.720 1.200 1.834810 42.73
14) 23.155 5.413 1.618000 63.34 P2
15) -53.323 1.992
16) -47.176 1.200 1.816000 46.59
17) 13.539 6.663 1.593190 67.90 P2
18) -44.547 d18
19) -22.465 1.200 1.801000 34.92 P1
20) -31.837 4.063
21) 37.168 5.930 1.592014 67.02
*22) -36.742 d22
23) -110.866 1.200 1.589130 61.25 N
*24) 82.217 d24
25) -154.025 1.200 1.618000 63.34 N
26) 58.288 d26
27) ∞ 1.600 1.516800 64.13
28) ∞ 0.200
[非球面データ]
m K A4 A6 A8 A10 A12 A14
5) -1.0000 2.25E-05 4.00E-08 -2.54E-11 1.56E-12 -7.84E-15 1.86E-17
11) 0.0000 -8.04E-06 -1.10E-08 -6.04E-11 -2.10E-14
22) 0.0000 1.64E-05 -1.39E-08 3.12E-11 -2.27E-13
24) 0.0000 6.46E-06 6.55E-09 -3.77E-11 3.26E-13
[各群焦点距離データ]
群 始面 焦点距離
G1 1 120.85
G2 4 -31.99
G3 11 38.78
G4 19 42.07
G5 23 -79.95
G6 25 -68.28
[可変間隔データ]
広角端状態 望遠端状態
d3 1.520 26.769
d9 25.467 6.262
d18 1.666 8.929
d22 5.905 0.358
d24 6.655 3.050
d26 12.200 37.722
図5は、広角端状態における無限遠物体合焦時の第3実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.70
ft 101.90
Fnow 4.00
Fnot 4.12
[レンズ諸元]
m r d nd νd (23) (24) (25)
1) 69.070 5.474 1.752087 52.47
2) 439.840 d2
* 3) ∞ 1.500 1.885373 40.28
4) 22.109 4.545
5) 42.147 1.000 1.489549 80.93 N
6) 21.170 4.738 1.861167 25.66 P1
7) 41.657 5.230
8) -25.535 1.011 1.803585 46.74
9) -37.107 d9
10> ∞ 1.400 (開口絞り)
11) 295.856 1.867 1.835571 24.07 P1
12) -113.960 0.200
13) 32.140 2.337 1.602919 62.63 P2
14) 125.086 2.085
15) -33.735 2.334 1.919001 29.19
16) -58.214 d16
*17) 30.409 6.839 1.508562 76.49 P2
18) -49.408 0.200
19) 84.317 1.002 1.890613 32.29
20) 19.543 6.528 1.588613 64.15 P2
*21) -88.251 d21
22) 1009.066 1.000 1.930813 30.21
23) 43.640 d23
24) 65.370 3.678 1.855614 24.40 P1
25) -632.954 0.380
26) 80.628 3.324 1.883000 40.66
27) -2737.698 d27
28) -140.459 1.000 1.456000 91.38 N
29) 28.388 Bf
[非球面データ]
m K A4 A6 A8 A10
3) 0.0000 4.90E-06 -1.37E-09 -5.21E-13 5.68E-15
17) 0.0000 -3.60E-06 1.38E-08 -4.49E-11 5.49E-14
21) 0.0000 1.56E-05 2.61E-08 9.57E-12 2.95E-13
[各群焦点距離データ]
群 始面 焦点距離
G1 1 108.26
G2 3 -23.31
G3 11 72.07
G4 17 36.45
G5 22 -49.03
G6 24 39.51
G7 28 -51.69
[可変間隔データ]
広角端状態 望遠端状態
d2 1.500 38.142
d9 23.111 1.850
d16 10.315 1.500
d21 7.006 2.000
d23 2.971 33.465
d27 4.024 4.217
Bf 18.056 39.081
図7は、広角端状態における無限遠物体合焦時の第4実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.70
ft 116.50
Fnow 4.00
Fnot 4.12
[レンズ諸元]
m r d nd νd (23) (24) (25)
1) 77.446 5.210 1.727296 53.67
2) 584.308 d2
* 3) ∞ 1.000 1.862652 41.96
4) 27.504 4.699
5) 130.462 1.752 1.484196 82.34 N
6) 26.180 4.599 1.857087 24.50 P1
7) 67.904 4.302
8) -30.859 1.000 1.820730 45.17
* 9) -53.767 d9
10> ∞ 1.400 (開口絞り)
11) 107.826 1.676 1.848261 23.90 P1
12) 621.616 0.200
13) 33.878 3.203 1.620766 60.92 P2
14) -929.742 2.057
15) -32.817 1.000 1.943635 31.37
16) -77.769 d16
*17) 29.728 6.798 1.520726 74.04 P2
18) -46.669 0.371
19) 50.503 1.040 1.892112 32.72
20) 19.569 7.642 1.588166 64.20 P2
*21) -135.546 d21
22) 207.734 1.000 1.953434 32.29
23) 34.501 d23
24) 72.467 2.748 1.846660 23.80 P1
25) -4031.890 d25
26) 760.138 2.738 1.855244 24.37
27) -90.866 d27
28) -56.111 1.000 1.511730 70.00 N
29) 46.882 Bf
[非球面データ]
m K A4 A6 A8 A10
3) 0.0000 4.80E-06 -1.03E-09 1.15E-12 5.58E-15
9) 0.0000 2.15E-06 -3.33E-09 3.17E-11 -6.65E-14
17) 0.0000 -4.97E-06 1.08E-08 -4.23E-11 4.57E-14
21) 0.0000 2.09E-05 3.18E-08 -4.07E-11 5.57E-13
[各群焦点距離データ]
群 始面 焦点距離
G1 1 122.23
G2 3 -25.06
G3 11 95.16
G4 17 29.99
G5 22 -43.51
G6 24 84.11
G7 26 95.04
G8 28 -49.75
[可変間隔データ]
広角端状態 望遠端状態
d2 1.500 42.085
d9 25.504 1.850
d16 11.841 1.500
d21 6.232 2.092
d23 3.379 34.095
d25 1.500 1.500
d27 4.340 7.175
Bf 15.724 34.724
図9は、広角端状態における無限遠物体合焦時の第5実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.70
ft 116.50
Fnow 4.00
Fnot 4.12
[レンズ諸元]
m r d nd νd (23) (24) (25)
1) 61.204 1.800 1.903660 31.27
2) 43.500 9.290 1.618000 63.34
3) 599.325 d3
* 4) 8892.243 1.400 1.775030 47.31
5) 21.486 7.770
6) -67.187 1.500 1.834000 37.18
7) 139.906 0.230
8) 60.170 4.730 1.854510 25.15 P1
9) -60.170 1.960
10) -27.165 1.100 1.497820 82.57 N
11) -128.171 d11
12> ∞ 0.880 (開口絞り)
*13) 34.508 3.660 1.593060 66.97 P2
14) 131.359 0.200
15) 51.576 2.030 1.618000 63.34 P2
16) 76.388 d16
17) 33.398 5.600 1.497820 82.57 P2
18) -112.939 1.450
19) 51.317 1.100 1.900430 37.38
20) 17.933 6.550 1.497820 82.57 P2
21) 1939.354 d21
22) -28.100 1.100 1.784720 25.64
23) -52.294 0.200
24) 156.708 4.090 1.772500 49.62
25) -53.421 d25
26) -214.076 3.800 1.553320 71.67 P2
*27) -36.775 d27
*28) -43.094 1.300 1.775030 47.31
29) 37.433 3.600 1.922860 20.88 P1
30) 81.956 Bf
[非球面データ]
m K A4 A6 A8 A10 A12 A14
4) 0.0000 6.78E-06 -9.11E-09 2.14E-11 -6.61E-15 -7.48E-17 1.46E-19
13) 0.0000 -7.33E-06 1.12E-09 -3.78E-12 -5.24E-15
27) 0.0000 1.69E-05 -8.63E-09 5.71E-12 -9.88E-15
28) 0.0000 2.41E-06 1.50E-09 -1.37E-10 6.99E-13 -1.28E-15 -1.88E-19
[各群焦点距離データ]
群 始面 焦点距離
G1 1 136.58
G2 4 -24.06
G3 13 59.44
G4 17 67.49
G5 22 135.76
G6 26 79.64
G7 28 -38.93
[可変間隔データ]
広角端状態 望遠端状態
d3 1.525 46.708
d11 24.145 2.370
d16 9.007 1.400
d21 6.277 18.040
d25 2.000 5.177
d27 9.107 1.773
Bf 13.555 45.147
図11は、広角端状態における無限遠物体合焦時の第6実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.70
ft 116.50
Fnow 4.10
Fnot 4.10
[レンズ諸元]
m r d nd νd (23) (24) (25)
* 1) 60.967 2.000 1.953750 32.33
2) 42.237 8.537 1.618000 63.34
3) -3319.753 d3
4) 426.783 0.100 1.560930 36.64
5) 278.283 1.200 1.883000 40.69
6) 22.697 6.425
7) -70.255 1.200 1.618000 63.34 N
8) 28.843 4.893 1.850250 30.05 P1
9) -92.169 1.309
10) -37.069 1.000 1.755000 52.34
11) -200.602 d11
12> ∞ 1.500 (開口絞り)
13) 41.043 3.957 1.497820 82.57 P2
14) -112.702 0.200
15) 50.383 3.908 1.593240 67.90 P2
*16) -73.304 d16
17) -44.208 1.000 1.696800 55.52
18) 54.606 0.100 1.560930 36.64
*19) 54.619 0.200
20) 32.260 2.040 1.846660 23.80 P1
21) 50.118 d21
*22) 38.298 4.049 1.593240 67.90 P2
23) -50.338 0.200
24) 66.052 4.718 1.755000 52.34
25) -25.774 1.000 1.950000 29.37
26) 36.234 1.627
27) 328.661 1.000 1.950000 29.37
28) 25.731 5.492 1.487490 70.31 P2
29) -46.438 0.200
30) 38.196 4.498 1.850000 27.03 P1
31) -143.789 d31
32) -102.642 2.859 1.672700 32.19 P1
33) -40.067 4.819
34) -33.105 1.200 1.696800 55.52
35) 33.390 d35
36) 90.269 2.873 1.846660 23.80 P1
37) 637.643 Bf
[非球面データ]
m K A4 A6 A8 A10
1) -1.0000 2.89E-06 -2.02E-09 7.60E-12 -1.67E-14
16) 0.0000 6.47E-06 -4.63E-09 -3.91E-12 2.63E-14
19) 0.0000 -5.70E-06 2.86E-08 -6.41E-11 5.59E-14
22) 0.0000 -1.01E-05 1.59E-08 -7.06E-11 1.42E-13
[各群焦点距離データ]
群 始面 焦点距離
G1 1 125.04
G2 4 -21.06
G3 13 28.56
G4 17 -52.12
G5 22 34.93
G6 32 -33.33
G7 36 123.90
[可変間隔データ]
広角端状態 望遠端状態
d3 1.500 41.533
d11 24.224 1.500
d16 2.407 11.409
d21 10.502 1.500
d31 2.120 2.268
d35 4.113 23.421
Bf 14.555 27.789
図13は、広角端状態における無限遠物体合焦時の第7実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.70
ft 116.50
Fnow 4.00
Fnot 4.12
[レンズ諸元]
m r d nd νd (23) (24) (25)
1) 79.267 5.328 1.610028 61.92
2) 1211.020 d2
* 3) -666.001 1.000 1.846765 43.08
4) 28.956 4.106
5) 119.464 1.000 1.488366 81.23 N
6) 23.990 5.694 1.859720 25.58 P1
7) 75.610 3.523
8) -40.022 1.000 1.858890 42.22
* 9) -119.737 d9
10> ∞ 1.400 (開口絞り)
11) 118.226 1.928 1.887426 26.67 P1
12) -502.479 0.200
13) 32.921 3.197 1.619109 61.07 P2
14) 3093.936 1.947
15) -36.444 1.000 1.951916 32.14
16) -121.050 d16
*17) 31.693 6.478 1.527617 72.77 P2
18) -45.685 0.200
19) 50.306 1.000 1.888302 31.72
20) 17.709 7.435 1.590315 63.96 P2
*21) -188.818 d21
22) 1078.096 1.000 1.952697 32.41
23) 53.346 d23
24) 45.805 3.800 1.846660 23.80 P1
25) -165.803 0.200
26) 83.490 1.000 1.863249 41.92
27) 32.358 d27
28) 520.111 3.315 1.786942 48.44
29) -71.011 d29
30) -27.595 1.000 1.456000 91.38 N
31) 102.771 Bf
[非球面データ]
m K A4 A6 A8 A10
3) 0.0000 5.62E-06 -2.41E-09 1.96E-12 3.09E-15
9) 0.0000 3.88E-06 -2.95E-09 1.22E-12
17) 0.0000 -4.03E-06 -5.75E-10 -1.45E-11
21) 0.0000 1.68E-05 9.33E-09 2.56E-11
[各群焦点距離データ]
群 始面 焦点距離
G1 1 138.79
G2 3 -25.57
G3 11 86.31
G4 17 32.32
G5 22 -58.94
G6 24 121.47
G7 28 79.59
G8 30 -47.59
[可変間隔データ]
広角端状態 望遠端状態
d2 1.500 45.179
d9 25.296 1.850
d16 11.979 1.400
d21 4.517 2.000
d23 3.091 27.107
d27 4.991 12.096
d29 5.275 4.684
Bf 12.055 29.388
図15は、広角端状態における無限遠物体合焦時の第8実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.75
ft 193.60
Fnow 4.00
Fnot 6.50
[レンズ諸元]
m r d nd νd (23) (25)
1) 50.215 2.000 1.903660 31.27
2) 34.572 9.588 1.603000 65.44
3) 1311.519 d3
4) 734.769 1.307 1.953750 32.33
5) 18.756 4.799
6) -48.834 1.129 1.755000 52.33
7) 82.569 0.451
8) 35.539 3.409 1.922860 20.88 P1
9) -55.882 0.297
10) -40.429 1.015 1.816000 46.59
11) 149.588 d11
12> ∞ 2.016 (開口絞り)
13) 45.792 2.740 1.902650 35.72 P1
14) -158.052 0.500
15) 51.626 1.000 2.001000 29.12
16) 25.348 3.645 1.579570 53.74
17) -47.120 1.756
18) -28.990 1.043 1.953750 32.33
19) -180.881 d19
20) 31.325 6.348 1.834810 42.73 P1
21) -46.677 1.000 1.903660 31.27
22) -434.420 0.175
23) 31.122 2.824 1.953750 32.33
24) 15.393 10.000 1.497100 81.49 P2
*25) -46.610 d25
26) 192.398 3.146 1.846660 23.80 P1
27) -50.784 1.017 1.851350 40.13
*28) 33.031 d28
29) -39.648 1.400 1.820800 42.51
*30) 237.062 0.232
31) 46.735 4.880 1.683760 37.57 P1
32) -359.761 Bf
[非球面データ]
m K A4 A6 A8 A10 A12
25) 0.0000 3.31E-05 -5.07E-08 7.86E-10 -4.83E-12 1.35E-14
28) 0.0000 -3.68E-06 5.73E-08 -1.75E-10 -8.02E-13 5.32E-15
30) 0.0000 7.67E-06 -1.25E-08 6.72E-11 -1.62E-13
[各群焦点距離データ]
群 始面 焦点距離
G1 1 110.64
G2 4 -16.88
G3 13 59.63
G4 20 27.13
G5 26 -47.14
G6 29 -137.34
[可変間隔データ]
広角端状態 望遠端状態
d3 1.969 54.765
d11 17.288 1.166
d19 14.645 1.478
d25 4.685 2.612
d28 8.395 23.634
Bf 11.793 37.548
図17は、広角端状態における無限遠物体合焦時の第9実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.75
ft 193.60
Fnow 4.00
Fnot 6.50
[レンズ諸元]
m r d nd νd (23) (25)
1) 50.215 2.000 1.903660 31.27
2) 34.572 9.588 1.603000 65.44
3) 1311.519 d3
4) 734.769 1.307 1.953750 32.33
5) 18.756 4.799
6) -48.834 1.129 1.755000 52.33
7) 82.569 0.451
8) 35.539 3.409 1.922860 20.88 P1
9) -55.882 0.297
10) -40.429 1.015 1.816000 46.59
11) 149.588 d11
12> ∞ 2.016 (開口絞り)
13) 45.792 2.740 1.902650 35.72 P1
14) -158.052 0.500
15) 51.626 1.000 2.001000 29.12
16) 25.348 3.645 1.579570 53.74
17) -47.120 1.756
18) -28.990 1.043 1.953750 32.33
19) -180.881 d19
20) 31.325 6.348 1.834810 42.73 P1
21) -46.677 1.000 1.903660 31.27
22) -434.420 0.175
23) 31.122 2.824 1.953750 32.33
24) 15.393 10.000 1.497100 81.49 P2
*25) -46.610 d25
26) 192.398 3.146 1.846660 23.80 P1
27) -50.784 1.017 1.851350 40.13
*28) 33.031 d28
29) -39.648 1.400 1.820800 42.51
*30) 237.062 0.232
31) 46.735 4.880 1.683760 37.57 P1
32) -359.761 Bf
[非球面データ]
m K A4 A6 A8 A10 A12
25) 0.0000 3.31E-05 -5.07E-08 7.86E-10 -4.83E-12 1.35E-14
28) 0.0000 -3.68E-06 5.73E-08 -1.75E-10 -8.02E-13 5.32E-15
30) 0.0000 7.67E-06 -1.25E-08 6.72E-11 -1.62E-13
[各群焦点距離データ]
群 始面 焦点距離
G1 1 110.64
G2 4 -16.88
G3 13 59.63
G4 20 27.13
G5 26 -47.14
G6 29 -137.34
[可変間隔データ]
広角端状態 望遠端状態
d3 1.969 54.765
d11 17.288 1.166
d19 14.645 1.478
d25 4.685 2.612
d28 8.395 23.634
Bf 11.793 37.548
図19は、広角端状態における無限遠物体合焦時の第10実施例の変倍光学系の断面図である。
[全体諸元]
fw 28.00
ft 194.00
Fnow 4.37
Fnot 6.57
[レンズ諸元]
m r d nd νd (23) (24) (25)
1) 63.743 2.000 1.749500 35.25
2) 40.141 10.350 1.593190 67.90
3) 9735.642 d3
* 4) 158.701 1.500 1.773870 47.25
* 5) 22.089 5.915
6) -167.771 1.000 1.497820 82.57 N
7) 20.719 4.566 1.850000 27.03 P1
8) 79.584 2.363
9) -46.857 1.000 1.834810 42.73
10) -393.371 d10
11> ∞ 2.000 (開口絞り)
*12) 25.238 2.790 1.592450 66.92 P2
13) 59.114 0.200
14) 26.374 2.366 1.617720 49.81
15) 38.522 d15
16) 23.189 2.580 1.902650 35.77
17) 13.857 5.703 1.497820 82.57 P2
18) 693.648 1.004
19) 752.104 4.789 1.517420 52.20
20) -18.856 1.000 2.000690 25.46
21) -60.570 0.200
*22) 443.772 4.473 1.517420 52.20
23) -23.063 d23
24) -308.609 5.485 1.945944 17.98
25) -37.228 1.504
26) -58.034 1.000 1.834000 37.18
27) 84.476 d27
*28) -39.484 1.500 1.773870 47.25
29) 108.384 d29
30) 38.120 2.261 1.834000 37.18
31) 43.033 Bf
[非球面データ]
m K A4 A6 A8 A10
4) 0.0000 7.29E-07 2.06E-08 -4.49E-11 2.79E-14
5) 0.0000 2.28E-06 3.23E-08 4.83E-11 2.02E-13
12) 0.0000 -9.41E-06 -1.09E-09 4.05E-11 -1.20E-13
22) 0.0000 -3.09E-05 2.57E-08 -7.88E-12 3.97E-13
28) 0.0000 -6.15E-06 -1.61E-08 3.82E-11 -1.85E-14
[各群焦点距離データ]
群 始面 焦点距離
G1 1 127.24
G2 4 -21.51
G3 12 45.92
G4 16 42.44
G5 24 -980.13
G6 28 -37.23
G7 30 331.08
[可変間隔データ]
広角端状態 望遠端状態
d3 2.000 51.261
d10 25.674 2.000
d15 9.525 2.000
d23 3.205 2.269
d27 5.176 5.639
d29 4.174 37.020
Bf 13.579 36.718
図21は、広角端状態における無限遠物体合焦時の第11実施例の変倍光学系の断面図である。
[全体諸元]
fw 24.70
ft 233.00
Fnow 4.50
Fnot 6.57
[レンズ諸元]
m r d nd νd (23) (25)
1) 59.540 1.800 1.902650 35.77
2) 41.859 11.321 1.593190 67.90
3) -1956.315 d3
* 4) -379.614 1.500 1.773870 47.25
5) 21.088 6.883
6) -118.229 1.000 1.950000 29.37
7) 89.211 0.200
8) 38.887 5.729 1.860740 23.08 P1
9) -55.015 1.189
10) -34.049 1.000 1.816000 46.59
11) 19309.949 d11
12> ∞ 2.000 (開口絞り)
*13) 23.950 5.797 1.592450 66.92 P2
14) -162.098 0.200
15) 35.893 1.000 1.834810 42.73
16) 22.737 2.714 1.592700 35.27 P1
17) 30.251 d17
18) 26.148 5.048 1.593190 67.90 P2
19) -98.728 1.059
20) -84.013 1.000 2.000690 25.46
21) 20.844 4.119 1.593190 67.90
22) 163.041 d22
23) 23.630 1.000 1.902650 35.77
24) 12.909 6.589 1.728250 28.38
25) 150.766 d25
26) 48.329 2.746 1.548141 45.78 P1
*27) -404.148 d27
28) -65.371 1.000 1.816000 46.59
29) 26.189 0.850
30) 34.959 6.023 1.688930 31.16 P1
31) -33.122 1.371
*32) -22.123 1.300 1.773870 47.25
33) ∞ Bf
[非球面データ]
m K A4 A6 A8 A10
4) 0.0000 2.64E-06 -1.77E-09 5.14E-12 -3.69E-15
13) 0.0000 -1.00E-05 -3.09E-09 -1.67E-11 -9.99E-15
27) 0.0000 2.31E-05 -1.32E-09 -3.88E-11 -1.96E-12
32) 0.0000 6.59E-06 1.96E-08 -1.08E-10 5.11E-13
[各群焦点距離データ]
群 始面 焦点距離
G1 1 122.62
G2 4 -21.74
G3 13 41.87
G4 18 -326.91
G5 23 48.34
G6 26 78.92
G7 28 -25.48
[可変間隔データ]
広角端状態 望遠端状態
d3 2.000 51.859
d11 33.722 2.003
d17 9.826 2.000
d22 2.157 3.750
d25 2.446 6.907
d27 3.087 2.700
Bf 11.455 67.126
条件式 | 実施例 第1 第2 第3 第4 第5 第6
(1)f1/D1 : 13.049 11.997 19.776 23.460 12.316 11.866
(2)M1/D1 : 2.757 2.946 9.731 10.557 4.959 4.745
(3)f1/(-fN1) : 5.679 3.777 4.645 4.878 5.677 5.938
(4)f1/(-fN2) : 2.898 1.512 2.208 2.809 3.508 2.399
(5)fN1/fN2 : 0.510 0.400 0.475 0.576 0.618 0.404
(6)f1/fP1 : 3.178 3.116 1.502 1.284 2.298 4.379
(7)fP1/(-fN1) : 1.787 1.212 3.092 3.798 2.470 1.356
(8)MP1/MN1 : 16.793 5.337 2.278 2.641 3.218 3.280
(9)fP1/fP2 : 0.391 0.922 1.977 3.173 0.881 0.817
(10)f1/fFP : 1.117 2.873 - 1.453 1.006 -
1.418 1.715
(11)fFP/fRPw : -1.109 -1.200 - -0.719 -1.361 -
-2.043 -2.046
(12)f1/(-fFN) : - 1.512 2.208 2.809 - 3.751
(13)(-fFN)/fRNw : - -1.171 0.474 0.215 - 0.269
(14)f1/(-fR) : 2.898 1.770 2.094 2.457 3.508 -
(15)f1/fR : - - - - - 1.009
(16)nd1 : 1.855 1.847 1.752 1.727 1.904 1.954
1.816 1.755 1.618 1.618
(17)νd1 : 25.15 23.70 52.47 53.67 31.27 32.33
46.59 52.30 63.34 63.34
(18)(r2-r1)/(r2+r1): 0.337 -2.218 -1.507 -11.160 0.373 0.752
(19)fN/fFN : - 1.000 1.054 1.143 - 1.564
(20)Fnot : 2.920 4.100 4.120 4.120 4.120 4.100
(21)Bfw/fw : 0.479 0.492 0.731 0.637 0.549 0.589
(22)|fF1|/|fF2| : 1.269 0.526 - 0.517 1.705 -
(23)νdP1 : 42.73 25.46 25.66 24.50 25.15 30.05
42.50 34.92 24.07 23.90 20.88 23.80
24.40 23.80 27.03
32.19
23.80
(24)νdN : 67.00 61.25 80.93 82.34 82.57 63.34
63.34 91.38 70.00
(25)νdP2 : 67.90 71.68 62.63 60.92 66.97 82.57
82.57 63.34 76.49 74.04 63.34 67.90
67.00 67.90 64.15 64.20 82.57 67.90
82.57 70.31
71.67
(1)f1/D1 : 26.049 9.548 9.548 10.302 9.345
(2)M1/D1 : 10.323 5.387 5.387 5.957 5.461
(3)f1/(-fN1) : 5.429 6.554 6.554 5.914 5.639
(4)f1/(-fN2) : 2.355 2.347 2.347 0.130 0.375
(5)fN1/fN2 : 0.434 0.358 0.358 0.022 0.067
(6)f1/fP1 : 1.608 1.855 1.855 2.771 2.929
(7)fP1/(-fN1) : 3.376 3.532 3.532 2.134 1.926
(8)MP1/MN1 : 3.071 2.674 2.674 1.974 2.455
(9)fP1/fP2 : 2.670 2.198 2.198 1.082 0.866
(10)f1/fFP : 1.744 - 4.078 - 2.537
1.554
(11)fFP/fRPw : -1.672 - -0.795 - -1.110
-3.098
(12)f1/(-fFN) : 2.355 2.347 2.347 0.130 -
3.417
(13)(-fFN)/fRNw : 0.180 -0.343 -0.343 -23.612 -
0.112
(14)f1/(-fR) : 2.916 0.806 0.806 - 4.813
(15)f1/fR : - - - 0.384 -
(16)nd1 : 1.610 1.603 1.603 1.750 1.903
1.593 1.593
(17)νd1 : 61.93 65.44 65.44 35.25 35.77
67.90 67.90
(18)(r2-r1)/(r2+r1): 1.734 1.299 1.299 0.061 -1.000
(19)fN/fFN : 1.000 2.913 2.913 1.000 -
26.324
(20)Fnot : 4.120 6.480 6.480 6.569 6.574
(21)Bfw/fw : 0.488 0.476 0.476 0.485 0.464
(22)|fF1|/|fF2| : 0.740 - 0.575 - 0.612
(23)νdP1 : 25.58 20.88 20.88 27.03 23.08
26.67 35.72 35.72 35.27
23.80 42.73 42.73 45.78
23.80 23.80 31.16
37.57 37.57
(24)νdN : 81.23 - - 82.57 -
91.38
(25)νdP2 : 61.07 81.49 81.49 66.92 66.92
72.77 82.57 67.90
63.96
図23は、本実施形態の変倍光学系を備えたカメラの模式図である。
(1) 8.00 < f1/D1 < 27.00
(2) 1.00 < M1/D1 < 12.00
但し、
f1 : 第1レンズ群の焦点距離
D1 : 第1レンズ群の光軸上の厚み
M1 : 広角端状態から望遠端状態への変倍の際の第1レンズ群の移動量
I 像面
1 カメラ
2 撮影レンズ
3 撮像素子
Claims (35)
- 6群以上の複数のレンズ群を有し、前記複数のレンズ群は、正の屈折力を有する第1レンズ群と、前記第1レンズ群より像側に配置された後群とからなり、
変倍の際に、各レンズ群の間隔が変化し、
前記第1レンズ群は2枚以下のレンズからなり、
以下の条件式をともに満足する変倍光学系。
8.00 < f1/D1 < 27.00
1.00 < M1/D1 < 12.00
但し、
f1 : 前記第1レンズ群の焦点距離
D1 : 前記第1レンズ群の光軸上の厚み
M1 : 広角端状態から望遠端状態への変倍の際の前記第1レンズ群の移動量 - 前記後群は、負の屈折力を有する第1負レンズ群を有し、
以下の条件式を満足する請求項1に記載の変倍光学系。
1.00 < f1/(-fN1) < 8.00
但し、
fN1 : 前記第1負レンズ群の焦点距離 - 前記後群は、負の屈折力を有する第1負レンズ群と、前記第1負レンズ群より像側に配置された負の屈折力を有する第2負レンズ群とを有し、
以下の式を満足する請求項1または2に記載の変倍光学系。
0.10 < f1/(-fN2) < 5.00
但し、
fN2 : 前記第2負レンズ群の焦点距離 - 前記後群は、負の屈折力を有する第1負レンズ群と、前記第1負レンズ群より像側に配置された負の屈折力を有する第2負レンズ群とを有し、
以下の式を満足する請求項1-3のいずれか一項に記載の変倍光学系。
0.01 < fN1/fN2 < 1.00
但し、
fN1 : 前記第1負レンズ群の焦点距離
fN2 : 前記第2負レンズ群の焦点距離 - 前記第1負レンズ群は、前記後群内の負の屈折力を有するレンズ群のうち最も物体側に配置されたレンズ群である請求項2-4のいずれか一項に記載の変倍光学系。
- 前記後群は、正の屈折力を有する第1正レンズ群を有し、
以下の条件式を満足する請求項1に記載の変倍光学系。
0.75 < f1/fP1 < 5.00
但し、
fP1 : 前記第1正レンズ群の焦点距離 - 前記後群は、正の屈折力を有する第1正レンズ群と、前記第1正レンズ群より像側に配置された負の屈折力を有する第1負レンズ群とを有し、
以下の条件式を満足する請求項1-6のいずれか一項に記載の変倍光学系。
0.75 < fP1/(-fN1) < 4.50
但し、
fP1 : 前記第1正レンズ群の焦点距離
fN1 : 前記第1負レンズ群の焦点距離 - 前記後群は、正の屈折力を有する第1正レンズ群と、前記第1正レンズ群より像側に配置された負の屈折力を有する第1負レンズ群とを有し、
以下の条件式を満足する請求項1-7のいずれか一項に記載の変倍光学系。
1.00 < MP1/MN1 < 20.00
但し、
MP1 : 広角端状態から望遠端状態への変倍時の前記第1正レンズ群の移動量
MN1 : 広角端状態から望遠端状態への変倍時の前記第1負レンズ群の移動量 - 前記後群は、正の屈折力を有する第1正レンズ群と、前記第1正レンズ群より像側に配置された正の屈折力を有する第2正レンズ群とを有する請求項1-8のいずれか一項に記載の変倍光学系。
- 以下の条件式を満足する請求項9に記載の変倍光学系。
0.25 < fP1/fP2 < 3.50
但し、
fP1 : 前記第1正レンズ群の焦点距離
fP2 : 前記第2正レンズ群の焦点距離 - 前記第1正レンズ群は、前記後群内の正の屈折力を有するレンズ群のうち最も物体側に配置されたレンズ群である請求項6-10のいずれか一項に記載の変倍光学系。
- 前記後群は、正の屈折力を有し合焦の際に光軸に沿って移動する正合焦群を有し、
以下の条件式を満足する請求項1-11のいずれか一項に記載の変倍光学系。
0.75 < f1/fFP < 4.50
但し、
fFP : 前記正合焦群の焦点距離 - 前記後群は、正の屈折力を有し合焦の際に光軸に沿って移動する正合焦群を有し、
以下の条件式を満足する請求項1-12のいずれか一項に記載の変倍光学系。
-3.50 < fFP/fRPw < -0.50
但し、
fFP : 前記正合焦群の焦点距離
fRPw: 前記正合焦群より像側に配置されたレンズ群の広角端状態における合成焦点距離 - 前記後群は、負の屈折力を有し合焦の際に光軸に沿って移動する負合焦群を有し、
以下の条件式を満足する請求項1-13のいずれか一項に記載の変倍光学系。
0.10 < f1/(-fFN) < 4.00
但し、
fFN : 前記負合焦群の焦点距離 - 前記後群は、負の屈折力を有し合焦の際に光軸に沿って移動する負合焦群を有し、
以下の条件式を満足する請求項1-14のいずれか一項に記載の変倍光学系。
-25.00 < (-fFN)/fRNw < 1.00
但し、
fFN : 前記負合焦群の焦点距離
fRNw: 前記負合焦群より像側に配置されたレンズ群の広角端状態における合成焦点距離 - 前記後群内のレンズ群のうち最も像側に配置された最終レンズ群は負の屈折力を有し、
以下の条件式を満足する請求項1-15のいずれか一項に記載の変倍光学系。
0.10 < f1/(-fR) < 5.00
但し、
fR : 前記最終レンズ群の焦点距離 - 前記後群内のレンズ群のうち最も像側に配置された最終レンズ群は正の屈折力を有し、
以下の条件式を満足する請求項1-15のいずれか一項に記載の変倍光学系。
0.10 < f1/fR < 1.50
但し、
fR : 前記最終レンズ群の焦点距離 - 前記第1レンズ群は、以下の条件式をともに満足するレンズを少なくとも1枚有する請求項1-17のいずれか一項に記載の変倍光学系。
1.45 < nd1 < 2.10
20.00 < νd1 < 75.00
但し、
nd1 : 前記第1レンズ群内のレンズのd線に対する屈折率
νd1 : 前記第1レンズ群内のレンズのd線を基準とするアッベ数 - 最も像側に配置されたレンズは、以下の条件式を満足する請求項1-18のいずれか一項に記載の変倍光学系。
-12.00 < (r2-r1)/(r2+r1) < 2.00
但し、
r1 : 前記最も像側に配置されたレンズの物体側のレンズ面の曲率半径
r2 : 前記最も像側に配置されたレンズの像側のレンズ面の曲率半径 - 前記後群は、負の屈折力を有し合焦の際に光軸に沿って移動する負合焦群を有し、
以下の条件式を満足する請求項1-19のいずれか一項に記載の変倍光学系。
0.75 < fN/fFN < 30.00
但し、
fN : 前記後群内の負の屈折力を有するレンズ群のうち最も屈折力が弱いレンズ群の焦点距離
fFN : 前記負合焦群の焦点距離 - 以下の条件式を満足する請求項1-20のいずれか一項に記載の変倍光学系。
Fnot < 7.00
但し、
Fnot : 望遠端状態における前記変倍光学系のF値 - 前記後群内のレンズ群のうち、像側から2番目に配置されたレンズ群は合焦の際に光軸に沿って移動される請求項1-21のいずれか一項に記載の変倍光学系。
- 以下の条件式を満足する請求項1-22のいずれか一項に記載の変倍光学系。
0.10 < Bfw/fw < 0.95
但し、
Bfw : 前記変倍光学系の広角端状態におけるバックフォーカス
fw : 前記変倍光学系の広角端状態における焦点距離 - 広角端状態から望遠端状態への変倍の際、前記第1レンズ群は物体側へ移動する請求項1-23のいずれか一項に記載の変倍光学系。
- 前記第1レンズ群は、物体側から順に負レンズと正レンズとからなる請求項1-24のいずれか一項に記載の変倍光学系。
- 前記第1レンズ群は、正レンズからなる請求項1-24のいずれか一項に記載の変倍光学系。
- 前記後群は、合焦の際に光軸に沿ってそれぞれ移動する第1合焦群と第2合焦群をと有する請求項1-26のいずれか一項に記載の変倍光学系。
- 以下の条件式を満足する請求項27に記載の変倍光学系。
0.20 < |fF1|/|fF2| < 30.00
但し、
fF1 : 前記第1合焦群の焦点距離
fF2 : 前記第2合焦群の焦点距離 - 前記後群内の正レンズのうち少なくとも1枚は、以下の第1分散条件式を満足する請求項1-28のいずれか一項に記載の変倍光学系。
νdP1 < 45.00
但し、
νdP1 : 前記後群内の正レンズのd線を基準とするアッベ数 - 前記第1分散条件式を満足する正レンズは、前記後群内のレンズ群のうち負の屈折力を有する負レンズ群に含まれる請求項29に記載の変倍光学系。
- 前記後群内の負レンズのうち少なくとも1枚は、以下の第2分散条件式を満足する請求項1-30のいずれか一項に記載の変倍光学系。
60.00 < νdN
但し、
νdN : 前記後群内の負レンズのd線を基準とするアッベ数 - 前記第2分散条件式を満足する負レンズは、前記後群内のレンズ群のうち最も像側に配置された最終レンズ群に含まれる請求項31に記載の変倍光学系。
- 前記後群内のレンズ群のうち正の屈折力を有するレンズ群の少なくとも1つは、以下の第3分散条件式を満足する正レンズを有する請求項1-32のいずれか一項に記載の変倍光学系。
60.00 < νdP2
但し、
νdP2 : 前記後群内の正レンズのd線を基準とするアッベ数 - 請求項1-33のいずれか一項に記載の変倍光学系を有する光学機器。
- 6群以上の複数のレンズ群を有し、前記複数のレンズ群は、正の屈折力を有する第1レンズ群と、前記第1レンズ群より像側に配置された後群とからなる変倍光学系の製造方法であって、
変倍の際に、各レンズ群の間隔が変化し、
前記第1レンズ群は2枚以上のレンズからなり、
以下の条件式をともに満足するように配置する変倍光学系の製造方法。
8.00 < f1/D1 < 27.00
1.00 < M1/D1 < 12.00
但し、
f1 : 前記第1レンズ群の焦点距離
D1 : 前記第1レンズ群の光軸上の厚み
M1 : 広角端状態から望遠端状態への変倍時の前記第1レンズ群の移動量
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280028138.5A CN117120905A (zh) | 2021-06-09 | 2022-03-02 | 变倍光学系统、光学设备及变倍光学系统的制造方法 |
JP2023527506A JPWO2022259649A1 (ja) | 2021-06-09 | 2022-03-02 | |
US18/290,303 US20240264418A1 (en) | 2021-06-09 | 2022-03-02 | Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021-096938 | 2021-06-09 | ||
JP2021096938 | 2021-06-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022259649A1 true WO2022259649A1 (ja) | 2022-12-15 |
Family
ID=84425134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/008965 WO2022259649A1 (ja) | 2021-06-09 | 2022-03-02 | 変倍光学系、光学機器および変倍光学系の製造方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20240264418A1 (ja) |
JP (1) | JPWO2022259649A1 (ja) |
CN (1) | CN117120905A (ja) |
WO (1) | WO2022259649A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014129187A1 (ja) * | 2013-02-22 | 2014-08-28 | パナソニック株式会社 | ズームレンズ系、交換レンズ装置及びカメラシステム |
WO2015146067A1 (ja) * | 2014-03-28 | 2015-10-01 | 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 |
WO2016017727A1 (ja) * | 2014-07-30 | 2016-02-04 | 株式会社ニコン | 変倍光学系、光学装置、及び、変倍光学系の製造方法 |
JP2020027156A (ja) * | 2018-08-10 | 2020-02-20 | 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 |
JP2020170102A (ja) * | 2019-04-04 | 2020-10-15 | 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 |
JP2021067760A (ja) * | 2019-10-21 | 2021-04-30 | キヤノン株式会社 | ズームレンズ及びそれを有する光学機器 |
-
2022
- 2022-03-02 WO PCT/JP2022/008965 patent/WO2022259649A1/ja active Application Filing
- 2022-03-02 JP JP2023527506A patent/JPWO2022259649A1/ja active Pending
- 2022-03-02 US US18/290,303 patent/US20240264418A1/en active Pending
- 2022-03-02 CN CN202280028138.5A patent/CN117120905A/zh active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014129187A1 (ja) * | 2013-02-22 | 2014-08-28 | パナソニック株式会社 | ズームレンズ系、交換レンズ装置及びカメラシステム |
WO2015146067A1 (ja) * | 2014-03-28 | 2015-10-01 | 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 |
WO2016017727A1 (ja) * | 2014-07-30 | 2016-02-04 | 株式会社ニコン | 変倍光学系、光学装置、及び、変倍光学系の製造方法 |
JP2020027156A (ja) * | 2018-08-10 | 2020-02-20 | 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 |
JP2020170102A (ja) * | 2019-04-04 | 2020-10-15 | 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 |
JP2021067760A (ja) * | 2019-10-21 | 2021-04-30 | キヤノン株式会社 | ズームレンズ及びそれを有する光学機器 |
Also Published As
Publication number | Publication date |
---|---|
US20240264418A1 (en) | 2024-08-08 |
CN117120905A (zh) | 2023-11-24 |
JPWO2022259649A1 (ja) | 2022-12-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN106687848B (zh) | 变倍光学系统以及光学装置 | |
JP2019148827A (ja) | ズームレンズ、および光学機器 | |
JP5407363B2 (ja) | 変倍光学系、撮像装置、変倍光学系の製造方法 | |
JP2023091028A (ja) | 光学系、光学機器、および光学系の製造方法 | |
JP2023096110A (ja) | 変倍光学系、光学機器及び変倍光学系の製造方法 | |
CN107884917B (zh) | 变倍光学系统和光学装置 | |
CN113366362B (zh) | 变倍光学系统以及光学设备 | |
JP2019113576A (ja) | 光学系、光学機器、光学系の製造方法 | |
JP5212813B2 (ja) | ズームレンズ、これを搭載する光学機器および製造方法 | |
JP2024045767A (ja) | 光学系および光学機器 | |
JP7254271B2 (ja) | 変倍光学系、光学機器 | |
JP2023171585A (ja) | 変倍光学系、光学機器、及び変倍光学系の製造方法 | |
WO2022244840A1 (ja) | 光学系、光学機器および光学系の製造方法 | |
CN107850762A (zh) | 变倍光学系统、光学装置、变倍光学系统的制造方法 | |
JP5407365B2 (ja) | 変倍光学系、撮像装置、変倍光学系の製造方法 | |
WO2022259649A1 (ja) | 変倍光学系、光学機器および変倍光学系の製造方法 | |
CN106461922B (zh) | 变倍光学系统以及光学装置 | |
CN113302533B (zh) | 变倍光学系统以及光学设备 | |
JP5407364B2 (ja) | 変倍光学系、撮像装置、変倍光学系の製造方法 | |
WO2022259650A1 (ja) | 変倍光学系、光学機器および変倍光学系の製造方法 | |
CN116648920A (zh) | 变倍光学系统、光学设备以及变倍光学系统的制造方法 | |
JP7306587B2 (ja) | 光学系、光学機器および光学系の製造方法 | |
JP7338709B2 (ja) | 変倍光学系、光学機器および変倍光学系の製造方法 | |
WO2024214585A1 (ja) | 変倍光学系、光学機器および変倍光学系の製造方法 | |
WO2024095860A1 (ja) | 変倍光学系、光学機器および変倍光学系の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22819839 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023527506 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18290303 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 22819839 Country of ref document: EP Kind code of ref document: A1 |