WO2011048789A1 - ズームレンズ系、撮像装置及びカメラ - Google Patents
ズームレンズ系、撮像装置及びカメラ Download PDFInfo
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- WO2011048789A1 WO2011048789A1 PCT/JP2010/006156 JP2010006156W WO2011048789A1 WO 2011048789 A1 WO2011048789 A1 WO 2011048789A1 JP 2010006156 W JP2010006156 W JP 2010006156W WO 2011048789 A1 WO2011048789 A1 WO 2011048789A1
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- Prior art keywords
- lens
- lens group
- zoom lens
- zoom
- group
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
Definitions
- the present invention relates to a zoom lens system, an imaging device, and a camera.
- the present invention includes a high-performance zoom lens system that is well-balanced with a wide angle of view at a wide-angle end and a high zooming ratio in a small size, an imaging device including the zoom lens system, and the imaging device. It relates to a thin and compact camera.
- a camera having an image sensor that performs photoelectric conversion such as a digital still camera or a digital video camera
- a digital camera such as a digital still camera or a digital video camera
- a camera equipped with a zoom lens system with a high zooming ratio that can cover a wide focal length range from a wide angle range to a high telephoto range with a single digital camera is strongly demanded for its convenience.
- a zoom lens system having a wide angle range with a wide photographing range is also demanded.
- a first lens group having a positive power and a first lens having a negative power are sequentially arranged from the object side to the image side.
- Various zoom lenses having a positive / negative / positive / four-group configuration in which a two-lens group, a third lens group having a positive power, and a fourth lens group having a positive power are arranged have been proposed.
- Japanese Patent Laid-Open No. 2009-139701 has the above-described four groups of positive, negative, positive and positive, and at the time of zooming from the wide angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the first lens group is composed of one lens component
- the third lens group has two lenses, a positive lens and a negative lens
- the first lens group and the third lens group Including the ratio of the amount of movement on the optical axis at the telephoto end to the wide-angle end of the lens and the position through which the optical axes of the third lens group and the fourth lens group pass, and when measured in a linear direction perpendicular to the optical axis.
- a zoom lens that defines a relationship with a ratio of the maximum value of the length from one edge of the lens to the other edge is disclosed.
- Japanese Patent Application Laid-Open No. 2009-098458 has a four-group configuration of positive, negative, positive and positive, and at the time of zooming from the wide-angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- a zoom lens is disclosed that defines the relationship between the sum of the thickness of each lens group on the optical axis and the ratio of the focal length of the entire zoom lens system at the telephoto end. .
- Japanese Patent Application Laid-Open No. 2009-047986 has a four-group configuration of positive, negative, positive and positive, and at the time of zooming from the wide angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- a zoom lens is disclosed in which the distance between the lens groups is changed, and the relationship between the Abbe number and the partial dispersion ratio of at least one lens in the positive lens group disposed on the object side of the stop is defined.
- Japanese Patent Application Laid-Open No. 2008-191291 has the above-described four groups of positive, negative, positive and positive, and at the time of zooming from the wide angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the positive lens group disposed on the object side of the stop has a cemented lens formed by cementing a plurality of lenses, and the Abbe number of at least one lens constituting the cemented lens.
- a zoom lens that defines the relationship between the partial dispersion ratio and the zoom lens.
- Japanese Patent Application Laid-Open No. 2008-102166 has the above-described four groups of positive, negative, positive and positive, and at the time of zooming from the wide angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the first lens group is composed of two lenses
- the third lens group is composed of two lenses, a positive lens and a negative lens, in order from the object side.
- a zoom lens that defines the relationship between the thickness ratio of the positive lens and negative lens on the optical axis is disclosed.
- Japanese Patent Application Laid-Open No. 2007-271711 has the above-described four groups of positive, negative, positive and positive, and at the time of zooming from the wide angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the first lens group is composed of two or less lenses including a positive lens.
- the second lens group is a negative lens and a refraction having a different sign in order from the object side to the image side.
- a zoom lens having a compound lens composed of two optical members having a positive force and a positive lens is disclosed.
- Japanese Patent Application Laid-Open No. 2007-212537 has a four-group configuration of positive, negative, positive and positive, and at the time of zooming from the wide-angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the distance between the lens groups changes, and at the zoom position at which the first lens group is located closest to the image side during zooming, the surface of the lens disposed closest to the object side of the first lens group is set to the third surface side.
- a zoom lens is disclosed that defines the relationship between the distance from the surface of the lens group closest to the object side to the object vertex of the lens group and the ratio of the focal length of the entire lens system at the zoom position.
- Japanese Patent Application Laid-Open No. 2007-047538 has a positive, negative, positive, and positive four-group configuration, and at the time of zooming from the wide-angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the first lens group includes a negative lens and a positive lens in order from the object side to the image side
- the second lens group includes at least one positive lens
- the first lens group includes a first lens group.
- Japanese Patent Laid-Open No. 2006-171055 has the above-described four groups of positive, negative, positive and positive, and at the time of zooming from the wide-angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the first lens group is composed of one negative lens and one positive lens in order from the object side
- the second lens group is composed of two lenses in order from the object side.
- the third lens group includes three or less lenses, and defines the relationship between the focal length ratios of the third lens group and the fourth lens group. is doing.
- Japanese Patent Application Laid-Open No. 2005-181499 has the above-described four groups of positive, negative, positive and positive, and at the time of zooming from the wide angle end to the telephoto end, at least the first lens group, the second lens group, and the third lens group move.
- the first lens group is composed of one positive lens and one negative lens
- the third lens group includes at least a positive lens and a negative lens in order from the object side
- a zoom lens is disclosed in which at least the positive lens of the third lens group is a spherical lens, and the lens located closest to the image side of the third lens group has an aspherical surface on at least one surface.
- An object of the present invention is to provide a high-performance zoom lens system that is compact but has a wide angle of view at a wide-angle end and a high zooming ratio in a balanced manner, an imaging device including the zoom lens system, and the imaging device. It is to provide a thin and compact camera.
- the zoom lens system In order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power A group of The first lens group includes a cemented lens element composed of one negative lens element on the object side and one positive lens element on the image side, The fourth lens group is composed of one lens element; During zooming from the wide-angle end to the telephoto end during imaging, the first lens group, the second lens group, the third lens group, and the fourth lens group have an air space between each lens group and the lens group.
- the present invention An imaging apparatus capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of the object; An image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power
- a group of The first lens group includes a cemented lens element composed of one negative lens element on the object side and one positive lens element on the image side, The fourth lens group is composed of one lens element;
- the first lens group, the second lens group, the third lens group, and the fourth lens group have an air space between each lens group and the lens group.
- the present invention relates to an imaging apparatus that is a zoom lens system that satisfies the above.
- the present invention A camera that converts an optical image of an object into an electrical image signal, and displays and stores the converted image signal;
- An image pickup apparatus including a zoom lens system that forms an optical image of an object, and an image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power
- a group of The first lens group includes a cemented lens element composed of one negative lens element on the object side and one positive lens element on the image side,
- the fourth lens group is composed of one lens element;
- the first lens group, the second lens group, the third lens group, and the fourth lens group have an air space between each lens group and the lens group.
- zoom lens system In order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power A group of The first lens group is composed of two lens elements, The fourth lens group is composed of one lens element; During zooming from the wide-angle end to the telephoto end during imaging, the first lens group, the second lens group, the third lens group, and the fourth lens group have an air space between each lens group and the lens group.
- the present invention relates to a zoom lens system that satis
- the present invention An imaging apparatus capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of the object; An image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power
- a group of The first lens group is composed of two lens elements, The fourth lens group is composed of one lens element;
- the first lens group, the second lens group, the third lens group, and the fourth lens group have an air space between each lens group and the lens group.
- the present invention relates to an imaging apparatus that is a zoom lens
- the present invention A camera that converts an optical image of an object into an electrical image signal, and displays and stores the converted image signal;
- An image pickup apparatus including a zoom lens system that forms an optical image of an object, and an image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power
- a group of The first lens group is composed of two lens elements,
- the fourth lens group is composed of one lens element;
- the first lens group, the second lens group, the third lens group, and the fourth lens group have an air space between each lens group and the lens group.
- the present invention relates to a camera that is a zoom lens
- a high-performance zoom lens system that is compact and has a wide angle of view at a wide-angle end and a high zooming ratio in a balanced manner, an imaging apparatus including the zoom lens system, and the imaging apparatus.
- a thin and compact camera can be provided.
- FIG. 1 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 1 (Example 1).
- FIG. 2 is a longitudinal aberration diagram of the zoom lens system according to Example 1 when the zoom lens system is in focus at infinity.
- FIG. 3 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of the zoom lens system according to Example 1.
- FIG. 4 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 2 (Example 2).
- FIG. 5 is a longitudinal aberration diagram of the zoom lens system according to Example 2 when the zoom lens system is in focus at infinity.
- FIG. 5 is a longitudinal aberration diagram of the zoom lens system according to Example 2 when the zoom lens system is in focus at infinity.
- FIG. 6 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of the zoom lens system according to Example 2.
- FIG. 7 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 3 (Example 3).
- FIG. 8 is a longitudinal aberration diagram of the zoom lens system according to Example 3 when the zoom lens system is in focus at infinity.
- FIG. 9 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of the zoom lens system according to Example 3.
- FIG. 10 is a lens layout diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 4 (Example 4).
- FIG. 11 is a longitudinal aberration diagram of the zoom lens system according to Example 4 when the zoom lens system is in focus at infinity.
- FIG. 12 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 4.
- FIG. 13 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 5 (Example 5).
- FIG. 14 is a longitudinal aberration diagram of the zoom lens system according to Example 5 when the zoom lens system is in focus at infinity.
- FIG. 15 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 5.
- FIG. 12 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 4.
- FIG. 12 is a lateral
- FIG. 16 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 6 (Example 6).
- FIG. 17 is a longitudinal aberration diagram of the zoom lens system according to Example 6 at an infinite focus state.
- FIG. 18 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 6.
- FIG. 19 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 7 (Example 7).
- FIG. 20 is a longitudinal aberration diagram of the zoom lens system according to Example 7 at the infinite focus state.
- FIG. 21 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state, at the telephoto end of a zoom lens system according to Example 7.
- FIG. 22 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 8 (Example 8).
- FIG. 23 is a longitudinal aberration diagram of the zoom lens system according to Example 8 when the zoom lens system is in focus at infinity.
- FIG. 24 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 8.
- FIG. 25 is a schematic configuration diagram of a digital still camera according to the ninth embodiment.
- 1, 4, 7, 10, 13, 16, 19, and 22 are lens arrangement diagrams of the zoom lens systems according to Embodiments 1, 2, 3, 4, 5, 6, 7, and 8, respectively. Represents a zoom lens system in an infinite focus state.
- FIG. 5C shows the lens configuration at the telephoto end (longest focal length state: focal length f T ).
- the broken line arrows provided between FIGS. (A) and (b) are obtained by connecting the positions of the lens groups in the wide-angle end, the intermediate position, and the telephoto end in order from the top. Straight line.
- the wide-angle end and the intermediate position, and the intermediate position and the telephoto end are simply connected by a straight line, which is different from the actual movement of each lens group.
- an arrow attached to the lens group represents focusing from an infinitely focused state to a close object focused state. That is, the moving direction during focusing from the infinitely focused state to the close object focused state is shown.
- an asterisk * attached to a specific surface indicates that the surface is aspherical.
- a symbol (+) and a symbol ( ⁇ ) attached to a symbol of each lens group correspond to a power symbol of each lens group.
- the straight line described on the rightmost side represents the position of the image plane S, and is located on the object side of the image plane S (between the image plane S and the most image side lens surface of the fourth lens group G4).
- a parallel plate P equivalent to an optical low-pass filter, a face plate of an image sensor, or the like.
- an aperture stop A is provided on the most object side of the third lens group G3, and the aperture stop A is from the wide-angle end during imaging. During zooming to the telephoto end, it moves on the optical axis integrally with the third lens group G3.
- the zoom lens systems according to Embodiments 1 to 8 in order from the object side to the image side, the first lens group G1 having a positive power, the second lens group G2 having a negative power, and the positive power And a fourth lens group G4 having a positive power.
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus second lens element L2 having a convex surface facing the object side. It consists of.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus third lens element L3 having a convex surface facing the object side, a biconcave fourth lens element L4, and a convex surface facing the object side. And a positive meniscus fifth lens element L5.
- the third lens element L3 has two aspheric surfaces.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8.
- Surface number 15 is given to the agent layer.
- the sixth lens element L6 has two aspheric surfaces.
- the fourth lens group G4 comprises solely a positive meniscus ninth lens element L9 with the convex surface facing the object side.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus second lens element L2 having a convex surface facing the object side. It consists of.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus third lens element L3 having a convex surface facing the object side, a biconcave fourth lens element L4, and a convex surface facing the object side. And a positive meniscus fifth lens element L5.
- the third lens element L3 has an aspheric image side surface.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8.
- Surface number 15 is given to the agent layer.
- the sixth lens element L6 has two aspheric surfaces.
- the fourth lens group G4 comprises solely a positive meniscus ninth lens element L9 with the convex surface facing the object side.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus second lens element L2 having a convex surface facing the object side. It consists of.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus third lens element L3 having a convex surface facing the object side, a biconcave fourth lens element L4, and a convex surface facing the object side. And a positive meniscus fifth lens element L5.
- the third lens element L3 has an aspheric image side surface.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8.
- Surface number 15 is given to the agent layer.
- the sixth lens element L6 has two aspheric surfaces.
- the fourth lens group G4 comprises solely a biconvex ninth lens element L9.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus second lens element L2 having a convex surface facing the object side. It consists of.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus third lens element L3 with a convex surface facing the object side, and a negative meniscus fourth lens element L4 with a concave surface facing the object side. And a positive meniscus fifth lens element L5 having a convex surface directed toward the object side.
- the third lens element L3 has two aspheric surfaces.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8.
- Surface number 15 is given to the agent layer.
- the sixth lens element L6 has two aspheric surfaces.
- the fourth lens group G4 comprises solely a positive meniscus ninth lens element L9 with the convex surface facing the object side.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus second lens element L2 having a convex surface facing the object side. It consists of.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus third lens element L3 having a convex surface facing the object side, a biconcave fourth lens element L4, and a convex surface facing the object side. And a positive meniscus fifth lens element L5.
- the third lens element L3 has two aspheric surfaces.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8.
- Surface number 15 is given to the agent layer.
- the sixth lens element L6 has two aspheric surfaces.
- the fourth lens group G4 comprises solely a positive meniscus ninth lens element L9 with the convex surface facing the object side.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus second lens element L2 having a convex surface facing the object side. It consists of.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus third lens element L3 having a convex surface facing the object side, a biconcave fourth lens element L4, and a convex surface facing the object side. And a positive meniscus fifth lens element L5.
- the third lens element L3 has two aspheric surfaces.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8.
- Surface number 15 is given to the agent layer.
- the sixth lens element L6 has two aspheric surfaces.
- the fourth lens group G4 comprises solely a positive meniscus ninth lens element L9 with the convex surface facing the object side.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface directed toward the object side, and a biconvex second lens element L2.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens element L2 has an aspheric image side surface.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus third lens element L3 having a convex surface facing the object side, a biconcave fourth lens element L4, and a convex surface facing the object side. And a positive meniscus fifth lens element L5.
- the third lens element L3 has an aspheric image side surface.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8.
- Surface number 15 is given to the agent layer.
- the seventh lens element L7 has an aspheric object side surface.
- the fourth lens group G4 comprises solely a biconvex ninth lens element L9.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface directed toward the object side, and a biconvex second lens element L2.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the surface of the adhesive layer between the first lens element L1 and the second lens element L2 is a surface. Number 2 is assigned.
- the second lens element L2 has an aspheric image side surface.
- the second lens group G2 includes, in order from the object side to the image side, a biconcave third lens element L3, a biconcave fourth lens element L4, and a positive meniscus second lens element with a convex surface facing the object side. 5 lens elements L5.
- the third lens element L3 has an aspheric image side surface.
- the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a biconvex seventh lens element L7, and a biconcave eighth lens element L8. .
- the seventh lens element L7 has an aspheric object side surface.
- the fourth lens group G4 comprises solely a biconvex ninth lens element L9.
- the ninth lens element L9 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the ninth lens element L9).
- the first lens group G1 and the third lens group G3 move toward the object side during zooming from the wide-angle end to the telephoto end during imaging.
- the second lens group G2 moves along a locus that is convex toward the image side
- the fourth lens group G4 moves toward the image side along a locus that is convex toward the object side. That is, during zooming, each lens group moves along the optical axis so that the distance between the second lens group G2 and the third lens group G3 decreases.
- the fourth lens group G4 moves toward the object side along the optical axis during focusing from the infinitely focused state to the close-joined focused state.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group are used during zooming from the wide-angle end to the telephoto end during imaging.
- Zooming is performed by moving G4 along the optical axis, respectively, and any one of the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4, or
- the image point movement due to vibration of the entire system is corrected, that is, image blur due to camera shake, vibration, etc. is optically corrected. It can be corrected.
- the third lens group G3 moves in a direction orthogonal to the optical axis, thereby suppressing the increase in size of the entire zoom lens system, Image blur can be corrected while maintaining excellent imaging characteristics with small decentration coma and decentering astigmatism.
- one lens group is composed of a plurality of lens elements
- a part of the sub-lens groups of each lens group is any one of the plurality of lens elements or adjacent to each other.
- the first lens group G1 is composed of two lens elements and the second lens group G2 is composed of three lens elements, so that the total lens length is short. .
- the first lens group G1 in order from the object side to the image side, has a negative meniscus lens element L1 having a convex surface directed toward the object side, and a convex surface directed toward the object side. Since it is composed of the positive meniscus lens element L2 and the negative meniscus lens element L1 and the positive meniscus lens element L2 are joined to form a cemented lens element, a compact lens system is obtained. In addition, with such a configuration, chromatic aberration can be favorably corrected.
- the two lens elements constituting the first lens group G1 and the three lens elements constituting the second lens group G2 are arranged at the center of the second lens group G2. Since it has a positive radius of curvature except for the arranged fourth lens element L4, it is possible to correct curvature of field while maintaining a compact lens system.
- the first lens unit G1 in order from the object side to the image side, has a negative meniscus lens element L1 having a convex surface directed toward the object side, and a convex surface directed toward the object side. Since it is composed of a positive meniscus lens element or a biconvex lens element L2, and the negative meniscus lens element L1 and the lens element L2 are joined to form a cemented lens element, a compact lens system is obtained. Yes. In addition, with such a configuration, chromatic aberration can be favorably corrected.
- the third lens group G3 has positive power, in order from the object side to the image side, the sixth lens element L6 having both surfaces aspheric and positive power.
- the seventh lens element L7 having the negative power and the eighth lens element L8 having negative power, and the seventh lens element L7 and the eighth lens element L8, which are positive lens elements on the image side, are joined and joined. Since the lens element is formed, spherical aberration, coma aberration, and chromatic aberration can be corrected satisfactorily.
- the third lens group G3 includes, in order from the object side to the image side, a sixth lens element L6 having positive power, and a seventh lens element having positive power It is composed of L7 and an eighth lens element L8 having negative power, and has at least one aspheric surface in the third lens group G3, so that spherical aberration and coma aberration can be corrected well. Can do.
- the fourth lens group G4 is composed of one lens element, and the lens element has a positive power.
- the fourth lens group G4 when focusing from an object at infinity to an object at a short distance, rapid focusing is facilitated by extending the fourth lens group G4 to the object side as shown in each drawing.
- one lens element constituting the fourth lens group G4 has two aspheric surfaces, off-axis field curvature from the wide-angle end to the telephoto end can be corrected well.
- a zoom lens system such as the zoom lens systems according to Embodiments 1 to 8
- a plurality of preferable conditions are defined for the zoom lens system according to each embodiment, but a zoom lens system configuration that satisfies all of the plurality of conditions is most desirable.
- individual conditions it is possible to obtain a zoom lens system that exhibits the corresponding effects.
- a first lens group having a positive power in order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, and a positive power And a fourth lens group having a positive power.
- the first lens group is formed by joining one negative lens element on the object side and one positive lens element on the image side.
- a zoom lens system including a lens element and the fourth lens group including a single lens element hereinafter, this lens configuration is referred to as a basic configuration I of the embodiment
- ⁇ d L12 Abbe number of the positive lens element of the first lens group with respect to the d-line
- f T focal length of the entire system at the telephoto end
- f W The focal length of the entire system at the wide angle end.
- Condition (1) defines an appropriate Abbe number of the positive lens element of the first lens group. If the upper limit of condition (1) is exceeded, it may be difficult to control the variation of axial chromatic aberration associated with zooming.
- a first lens group having a positive power in order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, and a positive power And a fourth lens group having positive power.
- the first lens group is composed of two lens elements
- the fourth lens group is composed of one lens element.
- the zoom lens system configured (hereinafter, this lens configuration is referred to as the basic configuration II of the embodiment) satisfies the following condition (a), and the third lens group is composed of three lens elements. When configured, it is desirable that at least one of these three lens elements or at least two of the lens elements constituting the third lens group satisfy the following condition (2). .
- ⁇ d L3n Abbe number of each lens element of the third lens group with respect to the d-line
- PgF L3n Partial dispersion ratio represented by the following expression of each lens element of the third lens group
- PgF L3n (ng-nF) / (nF-nC)
- ng refractive index with respect to g-line
- nF refractive index for F-line
- nC refractive index with respect to C-line
- f T focal length of the entire system at the telephoto end
- f W The focal length of the entire system at the wide angle end.
- Condition (2) defines an appropriate Abbe number and partial dispersion ratio of the lens elements constituting the third lens group. If none of the three lens elements constituting the third lens group satisfies the condition (2), it may be difficult to control the balance between the secondary spectrum and the monochromatic aberration in the entire zoom region.
- a zoom lens system having the basic configuration I or II preferably satisfies the following condition (3). ⁇ 30.0 ⁇ f G2 / t L21 ⁇ 5.0 (3) here, f G2 : composite focal length of the second lens group, t L21 is the thickness on the optical axis of the most object side lens element of the second lens group.
- Condition (3) defines the ratio between the focal length of the second lens group and the thickness of the most object side lens element. If the lower limit of condition (3) is not reached, it may be difficult to achieve a wide angle. In addition, the lens element may become too thin, making manufacturing difficult. Conversely, when the value exceeds the upper limit of the condition (3), it may be difficult to control the distortion at the wide-angle end.
- the above effect can be further achieved by further satisfying at least one of the following conditions (3) ′ and (3) ′′. -25.0 ⁇ f G2 / t L21 (3) ′ f G2 / t L21 ⁇ -15.0 (3) ′′
- a zoom lens system having the basic configuration I or II preferably satisfies the following condition (4).
- L T total lens length at the telephoto end (distance from the most object side surface of the first lens group to the image plane)
- f T the focal length of the entire system at the telephoto end.
- Condition (4) defines the total lens length of the zoom lens system at the telephoto end. If the lower limit of the condition (4) is not reached, the power of each lens group becomes strong, and various aberrations of each lens group increase, which may make it difficult to correct aberrations. On the other hand, if the upper limit of condition (4) is exceeded, the power of each lens group becomes weak. Therefore, in order to maintain a high zoom ratio, the amount of movement of each lens group becomes large, making it difficult to ensure compactness. There is a fear.
- the above effect can be further achieved by satisfying at least one of the following conditions (4) ′ and (4) ′′. 1.1 ⁇ L T / f T (4) ′ L T / f T ⁇ 1.4 (4) ''
- a zoom lens system having the basic configuration I or II preferably satisfies the following condition (5). 3.5 ⁇ f G1 /
- Condition (5) defines the ratio between the focal length of the first lens group and the focal length of the second lens group. If the lower limit of the condition (5) is not reached, the focal length of the first lens group becomes relatively small, and it becomes difficult to maintain the zooming action of the second lens group, and the optical performance remains high while maintaining the optical performance. It may be difficult to construct a zoom lens system having a zoom ratio. On the contrary, if the upper limit of the condition (5) is exceeded, the focal length of the second lens group becomes relatively small, and it may be difficult to correct the aberration generated in the second lens group.
- the above effect can be further achieved by satisfying at least one of the following conditions (5) ′ and (5) ′′. 4.0 ⁇ f G1 /
- a zoom lens system having the basic configuration I or II preferably satisfies the following condition (6).
- f G1 composite focal length of the first lens group
- f T the focal length of the entire system at the telephoto end.
- Condition (6) defines an appropriate focal length of the first lens group. If the lower limit of condition (6) is not reached, the power of the first lens group becomes weak. Therefore, in order to maintain a high zoom ratio, the amount of movement of the second lens group becomes large, making it difficult to ensure compactness. There is a fear. On the other hand, if the upper limit of condition (6) is exceeded, the power of the first lens group becomes strong, and the amount of various aberrations increases, and it may be difficult to correct axial chromatic aberration, particularly at the telephoto end.
- the above effect can be further achieved by further satisfying at least one of the following conditions (6) ′ and (6) ′′.
- (6) ′ and (6) ′′ 1.0 ⁇ f T / f G1 (6) ′ f T / f G1 ⁇ 1.4 (6) ''
- a zoom lens system having the basic configuration I or II preferably satisfies the following condition (7).
- ⁇ 2T lateral magnification of the second lens group in the telephoto end and infinitely focused state
- ⁇ 2W is the lateral magnification of the second lens group at the wide-angle end and at infinity in-focus state.
- Condition (7) regulates the magnification change of the second lens group, and is a condition for substantially optimizing the zooming burden during zooming of the second lens group.
- the zooming load of the second lens group is not appropriate, and it may be difficult to make the zoom lens system compact while maintaining the optical performance.
- the above effect can be further achieved by satisfying at least one of the following conditions (7) ′ and (7) ′′. 2.4 ⁇ ⁇ 2T / ⁇ 2W (7) ′ ⁇ 2T / ⁇ 2W ⁇ 3.0 (7) ''
- Each lens group of the zoom lens system according to each embodiment includes only a refractive lens element that deflects incident light by refraction (that is, a lens element that deflects at the interface between media having different refractive indexes).
- a diffractive lens element that deflects incident light by diffraction a refractive lens element that deflects incident light by diffraction
- a refractive / diffractive hybrid lens element that deflects incident light by a combination of diffractive action and refractive action
- Each lens group may be composed of a distributed lens element or the like.
- it is preferable to form a diffractive structure at the interface of media having different refractive indexes since the wavelength dependency of diffraction efficiency is improved.
- FIG. 25 is a schematic configuration diagram of a digital still camera according to the ninth embodiment.
- the digital still camera includes an image pickup apparatus including a zoom lens system 1 and an image pickup device 2 that is a CCD, a liquid crystal monitor 3, and a housing 4.
- the zoom lens system 1 includes a first lens group G1, a second lens group G2, an aperture stop A, a third lens group G3, and a fourth lens group G4.
- the zoom lens system 1 is disposed on the front side
- the imaging element 2 is disposed on the rear side of the zoom lens system 1.
- a liquid crystal monitor 3 is disposed on the rear side of the housing 4, and an optical image of the subject by the zoom lens system 1 is formed on the image plane S.
- the lens barrel is composed of a main lens barrel 5, a movable lens barrel 6, and a cylindrical cam 7.
- the first lens group G1, the second lens group G2, the aperture stop A, the third lens group G3, and the fourth lens group G4 move to predetermined positions on the basis of the image sensor 2, Zooming from the wide-angle end to the telephoto end can be performed.
- the fourth lens group G4 is movable in the optical axis direction by a focus adjustment motor.
- the zoom lens system according to Embodiment 1 for a digital still camera, it is possible to provide a small digital still camera that has a high ability to correct resolution and curvature of field and has a short optical total length when not in use. it can.
- any of the zoom lens systems according to the second to eighth embodiments may be used instead of the zoom lens system according to the first embodiment.
- the optical system of the digital still camera shown in FIG. 25 can also be used for a digital video camera for moving images. In this case, not only a still image but also a moving image with high resolution can be taken.
- the zoom lens system according to the first to eighth embodiments is shown as the zoom lens system 1.
- these zoom lens systems need to use all zooming areas. There is no. That is, a range in which the optical performance is ensured may be cut out according to a desired zooming area, and used as a zoom lens system having a lower magnification than the zoom lens system described in the first to eighth embodiments.
- a zoom lens system is applied to a so-called collapsible lens barrel
- a prism having an internal reflection surface or a surface reflection mirror may be disposed at an arbitrary position such as in the first lens group G1, and the zoom lens system may be applied to a so-called bent lens barrel.
- some lenses constituting a zoom lens system such as the entire second lens group G2, the entire third lens group G3, the second lens group G2, or a part of the third lens group G3.
- the zoom lens system may be applied to a so-called sliding lens barrel in which the group is retracted from the optical axis when retracted.
- an imaging apparatus including the zoom lens system according to Embodiments 1 to 8 described above and an imaging element such as a CCD or CMOS is used as a mobile phone device, a surveillance camera in a surveillance system, a Web camera, an in-vehicle camera, or the like. It can also be applied to.
- each longitudinal aberration diagram shows the aberration at the wide angle end, (b) shows the intermediate position, and (c) shows the aberration at the telephoto end.
- Each longitudinal aberration diagram shows spherical aberration (SA (mm)), astigmatism (AST (mm)), and distortion (DIS (%)) in order from the left side.
- the vertical axis represents the F number (indicated by F in the figure), the solid line is the d line (d-line), the short broken line is the F line (F-line), and the long broken line is the C line (C- line), the long and short broken lines are the characteristics of the g line (g-line), and the long and short broken lines are the characteristics of the e line (e-line).
- the vertical axis represents the image height (indicated by H in the figure)
- the solid line represents the sagittal plane (indicated by s)
- the broken line represents the meridional plane (indicated by m in the figure). is there.
- the vertical axis represents the image height (indicated by H in the figure).
- FIG. 6 is a lateral aberration diagram in a basic state and an image blur correction state.
- each lateral aberration diagram the upper three aberration diagrams show a basic state in which no image blur correction is performed at the telephoto end, and the lower three aberration diagrams move the entire third lens group G3 by a predetermined amount in a direction perpendicular to the optical axis. This corresponds to the image blur correction state at the telephoto end.
- the upper row shows the lateral aberration at the image point of 75% of the maximum image height
- the middle row shows the transverse aberration at the axial image point
- the lower row shows the transverse aberration at the image point of ⁇ 75% of the maximum image height.
- each lateral aberration diagram in the image blur correction state shows the upper row shows the lateral aberration at the image point of 75% of the maximum image height
- the middle row shows the lateral aberration at the axial image point
- the lower row shows the image point at the image point of ⁇ 75% of the maximum image height.
- the horizontal axis represents the distance from the principal ray on the pupil plane
- the solid line is the d line (d-line)
- the short broken line is the F line (F-line)
- the long broken line is the C line ( C-line)
- the long and short broken lines are the characteristics of the g line (g-line)
- the long and short broken lines are the characteristics of the e line (e-line).
- the meridional plane is a plane including the optical axis of the first lens group G1.
- the movement amount in the direction perpendicular to the optical axis of the entire third lens group G3 in the image blur correction state at the telephoto end is as follows.
- the image decentering amount is when the entire third lens group G3 is translated by the above values in the direction perpendicular to the optical axis. Is equal to the amount of image eccentricity.
- Table 25 shows corresponding values for each condition in the zoom lens system of each numerical example.
- the zoom lens system according to the present invention is applicable to digital input devices such as a digital still camera, a digital video camera, a mobile phone device, a surveillance camera in a surveillance system, a Web camera, an in-vehicle camera, and the like. It is suitable for a photographing optical system that requires high image quality such as a camera.
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Abstract
Description
物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、物体側の1枚の負レンズ素子と像側の1枚の正レンズ素子との接合レンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a):
νdL12<43.50 ・・・(1)
fT/fW≧6.0 ・・・(a)
(ここで、
νdL12:第1レンズ群の正レンズ素子のd線に対するアッベ数、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)
を満足する、ズームレンズ系
に関する。
物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、物体側の1枚の負レンズ素子と像側の1枚の正レンズ素子との接合レンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a):
νdL12<43.50 ・・・(1)
fT/fW≧6.0 ・・・(a)
(ここで、
νdL12:第1レンズ群の正レンズ素子のd線に対するアッベ数、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)
を満足するズームレンズ系である、撮像装置
に関する。
物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、物体側の1枚の負レンズ素子と像側の1枚の正レンズ素子との接合レンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a):
νdL12<43.50 ・・・(1)
fT/fW≧6.0 ・・・(a)
(ここで、
νdL12:第1レンズ群の正レンズ素子のd線に対するアッベ数、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)
を満足するズームレンズ系である、カメラ
に関する。
物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、2枚のレンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
前記第3レンズ群が3枚のレンズ素子で構成され、これら3枚のレンズ素子のうち少なくとも1枚か、又は、前記第3レンズ群を構成するレンズ素子のうち少なくとも2枚が、以下の条件(2):
νdL3n:第3レンズ群の各レンズ素子の、d線に対するアッベ数、
PgFL3n:第3レンズ群の各レンズ素子の、次式で表される部分分散比、
PgFL3n=(ng-nF)/(nF-nC)、
ng:g線に対する屈折率、
nF:F線に対する屈折率、
nC:C線に対する屈折率
である)
を満足し、かつ以下の条件(a):
fT/fW≧6.0 ・・・(a)
(ここで、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)
を満足する、ズームレンズ系
に関する。
物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、2枚のレンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
前記第3レンズ群が3枚のレンズ素子で構成され、これら3枚のレンズ素子のうち少なくとも1枚か、又は、前記第3レンズ群を構成するレンズ素子のうち少なくとも2枚が、以下の条件(2):
νdL3n:第3レンズ群の各レンズ素子の、d線に対するアッベ数、
PgFL3n:第3レンズ群の各レンズ素子の、次式で表される部分分散比、
PgFL3n=(ng-nF)/(nF-nC)、
ng:g線に対する屈折率、
nF:F線に対する屈折率、
nC:C線に対する屈折率
である)
を満足し、かつ以下の条件(a):
fT/fW≧6.0 ・・・(a)
(ここで、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)
を満足するズームレンズ系である、撮像装置
に関する。
物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、2枚のレンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
前記第3レンズ群が3枚のレンズ素子で構成され、これら3枚のレンズ素子のうち少なくとも1枚か、又は、前記第3レンズ群を構成するレンズ素子のうち少なくとも2枚が、以下の条件(2):
νdL3n:第3レンズ群の各レンズ素子の、d線に対するアッベ数、
PgFL3n:第3レンズ群の各レンズ素子の、次式で表される部分分散比、
PgFL3n=(ng-nF)/(nF-nC)、
ng:g線に対する屈折率、
nF:F線に対する屈折率、
nC:C線に対する屈折率
である)
を満足し、かつ以下の条件(a):
fT/fW≧6.0 ・・・(a)
(ここで、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)
を満足するズームレンズ系である、カメラ
に関する。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、物体側に凸面を向けた正メニスカス形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、物体側に凸面を向けた正メニスカス形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、物体側に凸面を向けた正メニスカス形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、物体側に凸面を向けた正メニスカス形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、物体側に凸面を向けた正メニスカス形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、物体側に凸面を向けた正メニスカス形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、両凸形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。この第2レンズ素子L2は、その像側面が非球面である。
第1レンズ群G1は、物体側から像側へと順に、物体側に凸面を向けた負メニスカス形状の第1レンズ素子L1と、両凸形状の第2レンズ素子L2とからなる。第1レンズ素子L1と第2レンズ素子L2とは接合されており、後述する対応数値実施例における面データでは、これら第1レンズ素子L1と第2レンズ素子L2との間の接着剤層に面番号2が付与されている。この第2レンズ素子L2は、その像側面が非球面である。
νdL12<43.50 ・・・(1)
fT/fW≧6.0 ・・・(a)
ここで、
νdL12:第1レンズ群の正レンズ素子のd線に対するアッベ数、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
νdL12≦42.00 ・・・(1)’
ここで、
νdL3n:第3レンズ群の各レンズ素子の、d線に対するアッベ数、
PgFL3n:第3レンズ群の各レンズ素子の、次式で表される部分分散比、
PgFL3n=(ng-nF)/(nF-nC)、
ng:g線に対する屈折率、
nF:F線に対する屈折率、
nC:C線に対する屈折率、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
-30.0<fG2/tL21<-5.0 ・・・(3)
ここで、
fG2:第2レンズ群の合成焦点距離、
tL21:第2レンズ群の最物体側レンズ素子の光軸上の厚み
である。
-25.0≦fG2/tL21 ・・・(3)’
fG2/tL21≦-15.0 ・・・(3)’’
0.5<LT/fT<2.5 ・・・(4)
ここで、
LT:望遠端におけるレンズ全長(第1レンズ群の最物体側面から像面までの距離)、
fT:望遠端での全系の焦点距離
である。
1.1≦LT/fT ・・・(4)’
LT/fT≦1.4 ・・・(4)’’
3.5<fG1/|fG2|<6.0 ・・・(5)
ここで、
fG1:第1レンズ群の合成焦点距離、
fG2:第2レンズ群の合成焦点距離
である。
4.0≦fG1/|fG2| ・・・(5)’
fG1/|fG2|≦4.7 ・・・(5)’’
0.5<fT/fG1<3.0 ・・・(6)
ここで、
fG1:第1レンズ群の合成焦点距離、
fT:望遠端での全系の焦点距離
である。
1.0≦fT/fG1 ・・・(6)’
fT/fG1≦1.4 ・・・(6)’’
2.0<β2T/β2W<6.5 ・・・(7)
ここで、
β2T:望遠端かつ無限遠合焦状態における第2レンズ群の横倍率、
β2W:広角端かつ無限遠合焦状態における第2レンズ群の横倍率
である。
2.4≦β2T/β2W ・・・(7)’
β2T/β2W≦3.0 ・・・(7)’’
図25は、実施の形態9に係るデジタルスチルカメラの概略構成図である。図25において、デジタルスチルカメラは、ズームレンズ系1とCCDである撮像素子2とを含む撮像装置と、液晶モニタ3と、筐体4とから構成される。ズームレンズ系1として、実施の形態1に係るズームレンズ系が用いられている。図25において、ズームレンズ系1は、第1レンズ群G1と、第2レンズ群G2と、開口絞りAと、第3レンズ群G3と、第4レンズ群G4とから構成されている。筐体4は、前側にズームレンズ系1が配置され、ズームレンズ系1の後側には、撮像素子2が配置されている。筐体4の後側に液晶モニタ3が配置され、ズームレンズ系1による被写体の光学的な像が像面Sに形成される。
Z:光軸からの高さがhの非球面上の点から、非球面頂点の接平面までの距離
h:光軸からの高さ
r:頂点曲率半径
κ:円錐定数
An:n次の非球面係数
実施例 移動量(mm)
1 0.093
2 0.094
3 0.097
4 0.088
5 0.093
6 0.093
7 0.079
8 0.079
数値実施例1のズームレンズ系は、図1に示した実施の形態1に対応する。数値実施例1のズームレンズ系の面データを表1に、非球面データを表2に、各種データを表3に示す。
面番号 r d nd vd
物面 ∞
1 17.56640 0.50000 2.00272 19.3
2 11.94930 0.01000 1.56732 42.8
3 11.94930 3.12610 1.72342 38.0
4 178.34980 可変
5* 167.24460 0.30000 1.80470 41.0
6* 5.62480 2.78260
7 -13.17190 0.40000 1.77250 49.6
8 144.97740 0.15000
9 14.94940 0.95490 1.94595 18.0
10 191.90840 可変
11(絞り) ∞ 0.62500
12* 5.55950 2.27700 1.51776 69.9
13* -13.08710 0.15000
14 5.45400 1.94510 1.69680 55.5
15 -42.83440 0.01000 1.56732 42.8
16 -42.83440 0.30000 1.90366 31.3
17 3.83600 可変
18* 9.25040 1.53010 1.54410 56.1
19* 34.65240 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第5面
K= 0.00000E+00, A4= 2.85942E-04, A6=-5.17854E-06, A8= 2.24117E-08
A10= 0.00000E+00, A12= 0.00000E+00
第6面
K= 0.00000E+00, A4= 2.77898E-04, A6= 4.49772E-06, A8= 1.43029E-06
A10=-6.60172E-08, A12= 1.27352E-09
第12面
K= 0.00000E+00, A4=-1.94634E-04, A6= 1.70170E-05, A8= 5.80854E-06
A10=-3.06144E-10, A12= 0.00000E+00
第13面
K= 0.00000E+00, A4= 1.02931E-03, A6= 4.78170E-05, A8= 2.67269E-06
A10= 5.65734E-07, A12= 0.00000E+00
第18面
K= 0.00000E+00, A4=-4.58527E-04, A6= 4.00892E-05, A8=-2.59597E-06
A10= 6.99106E-08, A12=-1.44628E-09
第19面
K= 0.00000E+00, A4=-4.48892E-04, A6= 3.47638E-05, A8=-1.78782E-06
A10= 8.14501E-09, A12= 0.00000E+00
ズーム比 7.53632
広角 中間 望遠
焦点距離 5.1747 14.2138 38.9984
Fナンバー 3.37355 4.47770 6.13230
画角 39.6790 15.4588 5.5991
像高 3.7000 3.9000 3.9000
レンズ全長 38.2712 40.9601 50.9472
BF 0.58501 0.56483 0.53711
d4 0.3000 7.1634 14.5565
d10 13.7483 4.4348 0.3887
d17 5.4473 7.3188 16.0334
d19 2.3498 5.6375 3.5907
入射瞳位置 10.0430 22.6532 49.0778
射出瞳位置 -15.0986 -23.0580 -91.2023
前側主点位置 13.5103 28.3146 71.4980
後側主点位置 33.0965 26.7464 11.9488
単レンズデータ
レンズ 始面 焦点距離
1 1 -39.0060
2 3 17.5655
3 5 -7.2392
4 7 -15.6136
5 9 17.0939
6 12 7.8638
7 14 7.0599
8 16 -3.8842
9 18 22.7104
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 33.01250 3.63610 -0.46845 1.12288
2 5 -7.06018 4.58750 0.12808 0.82514
3 11 9.42972 5.30710 -2.72888 0.91457
4 18 22.71044 1.53010 -0.35336 0.20640
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.30682 -0.43723 -0.80646
3 11 -0.64683 -1.52445 -1.98670
4 18 0.78984 0.64597 0.73731
数値実施例2のズームレンズ系は、図4に示した実施の形態2に対応する。数値実施例2のズームレンズ系の面データを表4に、非球面データを表5に、各種データを表6に示す。
面番号 r d nd vd
物面 ∞
1 16.29520 0.50000 1.92286 20.9
2 10.77890 0.01000 1.56732 42.8
3 10.77890 3.06800 1.70154 41.1
4 148.37060 可変
5 115.96120 0.30000 1.80470 41.0
6* 5.39210 2.79390
7 -22.01530 0.40000 1.72916 54.7
8 25.44450 0.15000
9 11.54110 1.03550 2.00272 19.3
10 39.19580 可変
11(絞り) ∞ 0.62500
12* 5.07160 2.46070 1.51845 70.0
13* -23.19740 0.15000
14 4.98540 1.74460 1.67270 32.2
15 -19.35980 0.01000 1.56732 42.8
16 -19.35980 0.30000 1.84666 23.8
17 3.71460 可変
18* 10.64510 1.55240 1.52996 55.8
19* 70.99170 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第6面
K= 0.00000E+00, A4= 6.25974E-05, A6=-3.75623E-05, A8= 6.18415E-06
A10=-5.10504E-07, A12= 2.05297E-08, A14=-3.34330E-10
第12面
K= 1.20353E+00, A4=-8.04162E-04, A6=-6.13735E-05, A8= 3.71526E-05
A10=-1.30145E-05, A12= 2.02836E-06, A14=-1.21635E-07
第13面
K= 0.00000E+00, A4= 1.82446E-03, A6= 7.17589E-05, A8= 5.00920E-05
A10=-1.70199E-05, A12= 3.15885E-06, A14=-1.96339E-07
第18面
K= 0.00000E+00, A4=-4.13378E-04, A6=-4.29362E-05, A8= 2.54503E-06
A10= 1.47825E-07, A12=-2.99676E-08, A14= 8.23331E-10
第19面
K= 0.00000E+00, A4=-4.80811E-04, A6=-5.88279E-05, A8= 4.96823E-06
A10=-1.11215E-07, A12=-1.58118E-08, A14= 5.54189E-10
ズーム比 7.52984
広角 中間 望遠
焦点距離 5.1761 14.2159 38.9750
Fナンバー 3.42225 4.40672 6.12803
画角 39.8157 15.4979 5.6032
像高 3.7000 3.9000 3.9000
レンズ全長 39.6984 41.1345 49.5522
BF 0.59240 0.57053 0.49552
d4 0.3000 7.0803 13.4662
d10 15.0185 5.0670 0.6030
d17 5.6821 6.9912 16.0660
d19 2.2253 5.5454 3.0414
入射瞳位置 10.4737 23.8313 46.8965
射出瞳位置 -15.6682 -22.2100 -86.5111
前側主点位置 14.0021 29.1759 68.4125
後側主点位置 34.5223 26.9186 10.5773
単レンズデータ
レンズ 始面 焦点距離
1 1 -36.0717
2 3 16.4173
3 5 -7.0360
4 7 -16.1298
5 9 16.0129
6 12 8.2731
7 14 6.0683
8 16 -3.6592
9 18 23.4212
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 31.19710 3.57800 -0.47074 1.06615
2 5 -7.11233 4.67940 0.13288 0.93511
3 11 9.66720 5.29030 -2.77684 0.81521
4 18 23.42117 1.55240 -0.17741 0.36929
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.33644 -0.49530 -0.89196
3 11 -0.61092 -1.38057 -1.80375
4 18 0.80722 0.66640 0.77652
数値実施例3のズームレンズ系は、図7に示した実施の形態3に対応する。数値実施例3のズームレンズ系の面データを表7に、非球面データを表8に、各種データを表9に示す。
面番号 r d nd vd
物面 ∞
1 17.32600 0.50000 2.00272 19.3
2 11.73080 0.01000 1.56732 42.8
3 11.73080 3.20820 1.72342 38.0
4 158.28280 可変
5 87.36880 0.30000 1.80470 41.0
6* 5.58700 2.67160
7 -26.10120 0.40000 1.72916 54.7
8 18.99140 0.15000
9 10.79870 1.02790 2.00272 19.3
10 33.44110 可変
11(絞り) ∞ 0.62500
12* 5.53260 1.81860 1.51845 70.0
13* -14.34490 0.15000
14 5.14100 1.99320 1.67270 32.2
15 -21.14760 0.01000 1.56732 42.8
16 -21.14760 0.30000 1.84666 23.8
17 3.53780 可変
18* 10.62390 1.98570 1.52996 55.8
19* -100.00000 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第6面
K= 0.00000E+00, A4= 7.50057E-05, A6=-2.66662E-05, A8= 6.89778E-06
A10=-6.99029E-07, A12= 3.29899E-08, A14=-5.88238E-10
第12面
K= 1.21628E+00, A4=-1.04113E-03, A6= 4.61226E-05, A8= 2.66828E-06
A10=-7.06023E-06, A12= 1.78318E-06, A14=-1.28262E-07
第13面
K= 0.00000E+00, A4= 9.97876E-04, A6= 2.29302E-05, A8= 5.89349E-05
A10=-2.25235E-05, A12= 4.06752E-06, A14=-2.51060E-07
第18面
K= 0.00000E+00, A4=-4.76344E-04, A6= 4.20634E-05, A8=-4.94466E-06
A10= 3.54004E-07, A12=-1.83982E-08, A14= 3.51067E-10
第19面
K= 0.00000E+00, A4=-2.96228E-04, A6=-2.32396E-05, A8= 2.63333E-06
A10=-1.45674E-07, A12=-1.35053E-09, A14= 1.23193E-10
ズーム比 7.51511
広角 中間 望遠
焦点距離 5.1815 14.2154 38.9393
Fナンバー 3.40302 4.33636 6.12376
画角 39.7253 15.5496 5.6096
像高 3.7000 3.9000 3.9000
レンズ全長 38.8308 40.4147 50.6754
BF 0.59705 0.56284 0.48333
d4 0.3000 7.2154 14.5362
d10 14.4163 4.2071 0.6423
d17 5.5987 6.7856 16.3276
d19 1.9885 5.7136 2.7558
入射瞳位置 10.5463 23.0724 49.9317
射出瞳位置 -17.3747 -25.2062 1072.6476
前側主点位置 14.2338 29.4459 90.2851
後側主点位置 33.6493 26.1993 11.7362
単レンズデータ
レンズ 始面 焦点距離
1 1 -37.9235
2 3 17.3544
3 5 -7.4294
4 7 -15.0199
5 9 15.5520
6 12 7.9495
7 14 6.3412
8 16 -3.5598
9 18 18.2348
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 33.11760 3.71820 -0.51620 1.11405
2 5 -7.26627 4.54950 0.21984 1.06335
3 11 9.56419 4.89680 -2.97121 0.53406
4 18 18.23478 1.98570 0.12542 0.80513
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.31972 -0.45954 -0.85575
3 11 -0.63947 -1.65950 -1.88367
4 18 0.76526 0.56285 0.72942
数値実施例4のズームレンズ系は、図10に示した実施の形態4に対応する。数値実施例4のズームレンズ系の面データを表10に、非球面データを表11に、各種データを表12に示す。
面番号 r d nd vd
物面 ∞
1 17.36560 0.50000 1.92286 20.9
2 11.55610 0.01000 1.56732 42.8
3 11.55610 3.01640 1.70154 41.1
4 162.61910 可変
5* 158.80080 0.30000 1.80470 41.0
6* 5.57520 2.86790
7 -12.44870 0.40000 1.77250 49.6
8 -2628.47670 0.15000
9 16.12720 0.96220 1.94595 18.0
10 934.20150 可変
11(絞り) ∞ 0.62500
12* 5.45330 2.73670 1.51776 69.9
13* -14.04620 0.15000
14 5.19440 1.62480 1.69680 55.5
15 -173.71240 0.01000 1.56732 42.8
16 -173.71240 0.30000 1.90366 31.3
17 3.83850 可変
18* 9.66050 1.32130 1.54410 56.1
19* 25.73030 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第5面
K= 0.00000E+00, A4= 2.42181E-04, A6=-3.85749E-06, A8= 1.10420E-08
A10= 0.00000E+00, A12= 0.00000E+00
第6面
K= 0.00000E+00, A4= 1.93586E-04, A6= 9.26366E-07, A8= 1.44904E-06
A10=-6.64250E-08, A12= 1.17457E-09
第12面
K= 0.00000E+00, A4=-1.92502E-04, A6= 6.29467E-06, A8= 5.69133E-06
A10=-1.55884E-07, A12= 0.00000E+00
第13面
K= 0.00000E+00, A4= 1.11837E-03, A6= 3.77708E-05, A8= 3.76088E-06
A10= 2.73400E-07, A12= 0.00000E+00
第18面
K= 0.00000E+00, A4=-7.36070E-04, A6= 7.42127E-05, A8=-5.78154E-06
A10= 1.59205E-07, A12=-1.99102E-09
第19面
K= 0.00000E+00, A4=-8.06576E-04, A6= 7.40302E-05, A8=-5.31681E-06
A10= 9.49137E-08, A12= 0.00000E+00
ズーム比 7.53616
広角 中間 望遠
焦点距離 5.1746 14.2158 38.9965
Fナンバー 3.27449 4.43120 6.13257
画角 39.7293 15.4738 5.5996
像高 3.7000 3.9000 3.9000
レンズ全長 38.8165 41.1973 50.9458
BF 0.58293 0.56285 0.53571
d4 0.3000 6.8326 14.1400
d10 14.0819 4.5756 0.3503
d17 5.4812 7.8806 17.1145
d19 2.6162 5.5913 3.0510
入射瞳位置 10.0300 21.6962 46.3215
射出瞳位置 -14.6098 -22.6750 -66.3050
前側主点位置 13.4421 27.2155 62.5665
後側主点位置 33.6420 26.9814 11.9493
単レンズデータ
レンズ 始面 焦点距離
1 1 -39.0433
2 3 17.5877
3 5 -7.1867
4 7 -16.1926
5 9 17.3394
6 12 7.9684
7 14 7.2653
8 16 -4.1526
9 18 27.6281
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 33.04411 3.52640 -0.45402 1.05838
2 5 -7.13925 4.68010 0.07753 0.74277
3 11 9.56317 5.44650 -2.35094 1.11897
4 18 27.62812 1.32130 -0.49993 -0.01025
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.30960 -0.43198 -0.77438
3 11 -0.61879 -1.40179 -1.89697
4 18 0.81740 0.71044 0.80337
数値実施例5のズームレンズ系は、図13に示した実施の形態5に対応する。数値実施例5のズームレンズ系の面データを表13に、非球面データを表14に、各種データを表15に示す。
面番号 r d nd vd
物面 ∞
1 17.30050 0.50000 2.00272 19.3
2 11.72970 0.01000 1.56732 42.8
3 11.72970 3.14200 1.72342 38.0
4 160.66450 可変
5* 167.24300 0.30000 1.80470 41.0
6* 5.52920 2.80010
7 -13.20310 0.40000 1.78800 47.5
8 3719.23500 0.18580
9 15.76250 0.93890 1.94595 18.0
10 241.02260 可変
11(絞り) ∞ 0.62500
12* 6.04420 2.42890 1.52996 55.8
13* -12.20880 0.15000
14 5.00670 1.73130 1.69680 55.5
15 -18.19830 0.01000 1.56732 42.8
16 -18.19830 0.30000 1.90366 31.3
17 3.78650 可変
18* 8.98600 1.65400 1.51845 70.0
19* 37.48960 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第5面
K= 0.00000E+00, A4= 1.70780E-04, A6=-1.75666E-06, A8=-3.38736E-09
A10= 0.00000E+00, A12= 0.00000E+00
第6面
K= 0.00000E+00, A4= 1.17656E-04, A6=-6.52089E-06, A8= 2.48150E-06
A10=-1.34835E-07, A12= 3.01206E-09
第12面
K= 0.00000E+00, A4=-3.16945E-04, A6=-7.49065E-06, A8= 4.47061E-06
A10=-3.13132E-07, A12= 0.00000E+00
第13面
K= 0.00000E+00, A4= 5.47088E-04, A6= 6.18643E-06, A8= 2.37386E-06
A10=-9.42368E-08, A12= 0.00000E+00
第18面
K= 0.00000E+00, A4=-3.91662E-04, A6= 2.92529E-05, A8=-1.76210E-06
A10= 5.43748E-08, A12=-1.45926E-09
第19面
K= 0.00000E+00, A4=-2.94164E-04, A6= 1.58489E-05, A8=-4.20391E-07
A10=-2.06480E-08, A12= 0.00000E+00
ズーム比 7.53678
広角 中間 望遠
焦点距離 5.1735 14.2140 38.9916
Fナンバー 3.36744 4.49445 6.13224
画角 39.6852 15.4779 5.6005
像高 3.7000 3.9000 3.9000
レンズ全長 38.8615 41.8141 51.9178
BF 0.59451 0.57147 0.53621
d4 0.3000 7.1102 14.5074
d10 13.8831 4.5255 0.3909
d17 5.5291 8.0870 16.8559
d19 2.5988 5.5639 3.6714
入射瞳位置 10.0502 22.6053 49.1082
射出瞳位置 -15.7751 -25.7248 -124.3886
前側主点位置 13.5886 29.1361 75.9298
後側主点位置 33.6880 27.6001 12.9262
単レンズデータ
レンズ 始面 焦点距離
1 1 -38.0378
2 3 17.3378
3 5 -7.1119
4 7 -16.6952
5 9 17.7932
6 12 7.9970
7 14 5.8131
8 16 -3.4462
9 18 22.3537
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 32.96383 3.65200 -0.50334 1.09776
2 5 -7.09043 4.62480 0.07085 0.72709
3 11 9.73079 5.24520 -2.55567 0.92664
4 18 22.35374 1.65400 -0.33673 0.24916
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.30897 -0.43936 -0.81118
3 11 -0.65857 -1.53424 -2.00876
4 18 0.77130 0.63968 0.72592
数値実施例6のズームレンズ系は、図16に示した実施の形態6に対応する。数値実施例6のズームレンズ系の面データを表16に、非球面データを表17に、各種データを表18に示す。
面番号 r d nd vd
物面 ∞
1 17.83520 0.50000 1.92286 20.9
2 11.77160 0.01000 1.56732 42.8
3 11.77160 3.21320 1.70154 41.1
4 199.69830 可変
5* 199.42250 0.30000 1.80470 41.0
6* 5.56610 2.81280
7 -13.71530 0.40000 1.77250 49.6
8 316.88190 0.15000
9 15.13610 0.95450 1.94595 18.0
10 157.52110 可変
11(絞り) ∞ 0.62500
12* 5.89790 2.43820 1.54410 56.1
13* -12.10470 0.15000
14 5.14340 1.65300 1.69680 55.5
15 -16.97170 0.01000 1.56732 42.8
16 -16.97170 0.30000 1.90366 31.3
17 3.77790 可変
18* 8.45240 1.61880 1.51443 63.3
19* 27.61500 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第5面
K= 0.00000E+00, A4= 1.77604E-04, A6=-2.20211E-06, A8= 3.36483E-09
A10= 0.00000E+00, A12= 0.00000E+00
第6面
K= 0.00000E+00, A4= 1.31794E-04, A6=-6.16913E-06, A8= 2.36041E-06
A10=-1.29947E-07, A12= 2.81369E-09
第12面
K= 0.00000E+00, A4=-4.54176E-04, A6=-1.76469E-05, A8= 4.29393E-06
A10=-3.41897E-07, A12= 0.00000E+00
第13面
K= 0.00000E+00, A4= 4.45972E-04, A6=-3.07567E-06, A8= 1.99978E-06
A10=-1.30307E-07, A12= 0.00000E+00
第18面
K= 0.00000E+00, A4=-2.37774E-04, A6= 1.14625E-05, A8=-6.99293E-07
A10= 2.36503E-08, A12=-1.02186E-09
第19面
K= 0.00000E+00, A4=-1.20609E-04, A6=-1.09827E-06, A8= 3.03996E-07
A10=-3.01827E-08, A12= 0.00000E+00
ズーム比 7.53492
広角 中間 望遠
焦点距離 5.1741 14.2159 38.9864
Fナンバー 3.33258 4.48231 6.12929
画角 39.6961 15.5061 5.6014
像高 3.7000 3.9000 3.9000
レンズ全長 38.8846 41.9146 51.9540
BF 0.59064 0.57242 0.54360
d4 0.3000 7.1473 14.5962
d10 13.9810 4.6401 0.4013
d17 5.5392 8.3586 17.0324
d19 2.5583 5.2807 3.4650
入射瞳位置 10.1565 22.6838 48.7746
射出瞳位置 -15.3659 -25.5078 -109.3507
前側主点位置 13.6529 29.1508 73.9301
後側主点位置 33.7106 27.6987 12.9676
単レンズデータ
レンズ 始面 焦点距離
1 1 -39.0646
2 3 17.7058
3 5 -7.1205
4 7 -17.0089
5 9 17.6445
6 12 7.6538
7 14 5.8441
8 16 -3.3962
9 18 23.0175
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 33.38997 3.72320 -0.41462 1.17625
2 5 -7.17190 4.61730 0.06504 0.73729
3 11 9.71652 5.17620 -2.55396 0.88567
4 18 23.01746 1.61880 -0.45833 0.12137
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.30773 -0.43575 -0.79600
3 11 -0.64909 -1.48419 -1.98638
4 18 0.77580 0.65831 0.73845
数値実施例7のズームレンズ系は、図19に示した実施の形態7に対応する。数値実施例7のズームレンズ系の面データを表19に、非球面データを表20に、各種データを表21に示す。
面番号 r d nd vd
物面 ∞
1 15.46060 0.65000 1.84666 23.8
2 11.39100 0.01000 1.56732 42.8
3 11.39100 3.27410 1.58332 59.1
4* -184.16440 可変
5 140.14150 0.30000 1.52996 55.8
6* 4.67800 2.78410
7 -11.15550 0.30000 1.81600 46.6
8 16.49970 0.50740
9 12.74390 0.91570 1.92286 20.9
10 ∞ 可変
11(絞り) ∞ 0.30000
12 4.29620 2.48030 1.49700 81.6
13 -19.07390 0.10000
14* 7.57030 1.18220 1.52996 55.8
15 -46.65440 0.01000 1.56732 42.8
16 -46.65440 0.40000 1.58387 30.9
17 4.23240 可変
18* 18.72490 1.41970 1.52996 55.8
19* -29.55700 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第4面
K= 0.00000E+00, A4= 1.31901E-05, A6= 3.03104E-08, A8= 2.39305E-09
A10=-1.65140E-10, A12= 3.00698E-12, A14=-1.79574E-14
第6面
K= 0.00000E+00, A4=-1.18465E-04, A6= 2.04281E-06, A8=-4.24046E-06
A10= 1.04803E-06, A12=-8.75870E-08, A14= 2.75614E-09
第14面
K= 0.00000E+00, A4=-2.81173E-03, A6=-1.57291E-04, A8= 4.03746E-06
A10=-2.73995E-06, A12= 0.00000E+00, A14= 0.00000E+00
第18面
K= 0.00000E+00, A4= 3.72212E-04, A6= 1.77316E-06, A8=-1.07881E-06
A10= 3.05834E-08, A12= 0.00000E+00, A14= 0.00000E+00
第19面
K= 0.00000E+00, A4= 7.11115E-04, A6=-3.57053E-05, A8= 5.92606E-08
A10= 1.72177E-08, A12= 0.00000E+00, A14= 0.00000E+00
ズーム比 6.67767
広角 中間 望遠
焦点距離 5.5506 14.3299 37.0650
Fナンバー 3.40654 4.86979 6.43021
画角 37.3049 15.1093 5.9559
像高 3.7000 3.9000 3.9000
レンズ全長 35.6919 41.8395 49.4547
BF 0.49543 0.46289 0.45682
d4 0.3300 5.9780 11.6037
d10 10.4477 4.9511 0.8900
d17 4.9562 11.9061 18.5023
d19 4.0491 3.1279 2.5884
入射瞳位置 10.5916 22.7498 43.7283
射出瞳位置 -17.0686 -48.8263 -793.0001
前側主点位置 14.3881 32.9136 79.0618
後側主点位置 30.1413 27.5096 12.3897
単レンズデータ
レンズ 始面 焦点距離
1 1 -55.1510
2 3 18.5045
3 5 -9.1389
4 7 -8.1168
5 9 13.8091
6 12 7.3129
7 14 12.3839
8 16 -6.6268
9 18 21.8524
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 28.58370 3.93410 -0.01115 1.48081
2 5 -6.09278 4.80720 0.72216 1.43559
3 11 9.14446 4.47250 -1.50594 0.78169
4 18 21.85237 1.41970 0.36358 0.84580
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.32092 -0.45682 -0.79006
3 11 -0.81523 -1.39645 -2.02415
4 18 0.74224 0.78588 0.81085
数値実施例8のズームレンズ系は、図22に示した実施の形態8に対応する。数値実施例8のズームレンズ系の面データを表22に、非球面データを表23に、各種データを表24に示す。
面番号 r d nd vd
物面 ∞
1 15.55420 0.65000 1.84666 23.8
2 11.46980 0.01000 1.56732 42.8
3 11.46980 3.35550 1.58332 59.1
4* -163.32770 可変
5 -236.29390 0.30000 1.52996 55.8
6* 4.57740 2.81170
7 -12.22610 0.30000 1.81600 46.6
8 16.89160 0.49470
9 12.57070 0.84510 1.92286 20.9
10 ∞ 可変
11(絞り) ∞ 0.30000
12 4.36670 1.90240 1.49700 81.6
13 -249.29220 0.10000
14* 7.90730 1.21340 1.52996 55.8
15 -9.44610 0.10000
16 -32.42830 0.40000 1.58387 30.9
17 3.98840 可変
18* 19.91850 1.37760 1.52996 55.8
19* -28.66460 可変
20 ∞ 0.78000 1.51680 64.2
21 ∞ (BF)
像面 ∞
第4面
K= 0.00000E+00, A4= 1.45707E-05, A6=-7.04140E-08, A8= 1.09527E-08
A10=-4.93604E-10, A12= 8.96549E-12, A14=-5.91168E-14
第6面
K= 0.00000E+00, A4=-2.15651E-04, A6=-2.09617E-05, A8= 2.17302E-06
A10= 6.08565E-09, A12=-1.54598E-08, A14= 7.00040E-10
第14面
K= 0.00000E+00, A4=-3.13441E-03, A6=-1.14529E-04, A8=-2.39648E-06
A10=-2.49940E-07, A12= 0.00000E+00, A14= 0.00000E+00
第18面
K= 0.00000E+00, A4= 4.31871E-04, A6= 1.23307E-05, A8=-2.36290E-06
A10= 6.25471E-08, A12= 0.00000E+00, A14= 0.00000E+00
第19面
K= 0.00000E+00, A4= 7.27222E-04, A6=-1.13146E-05, A8=-2.24735E-06
A10= 7.23141E-08, A12= 0.00000E+00, A14= 0.00000E+00
ズーム比 6.68253
広角 中間 望遠
焦点距離 5.5488 14.3188 37.0800
Fナンバー 3.40608 4.84130 6.41180
画角 37.3716 15.1126 5.9575
像高 3.7000 3.9000 3.9000
レンズ全長 36.1928 42.2307 49.7950
BF 0.49140 0.45460 0.46153
d4 0.3300 5.9905 11.5402
d10 10.7483 5.0680 0.8900
d17 5.4943 12.5376 19.3851
d19 4.1884 3.2396 2.5778
入射瞳位置 10.5506 22.7495 43.3474
射出瞳位置 -17.9591 -51.1723 -1259.5482
前側主点位置 14.4307 33.0970 79.3362
後側主点位置 30.6440 27.9120 12.7151
単レンズデータ
レンズ 始面 焦点距離
1 1 -55.6503
2 3 18.5036
3 5 -8.4695
4 7 -8.6518
5 9 13.6215
6 12 8.6565
7 14 8.3234
8 16 -6.0583
9 18 22.3955
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 28.43025 4.01550 0.02381 1.54243
2 5 -6.14344 4.75150 0.58467 1.22996
3 11 9.40493 4.01580 -1.34929 0.59057
4 18 22.39551 1.37760 0.37282 0.84107
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.32507 -0.46406 -0.79900
3 11 -0.80687 -1.37707 -1.99706
4 18 0.74412 0.78813 0.81737
G2 第2レンズ群
G3 第3レンズ群
G4 第4レンズ群
L1 第1レンズ素子
L2 第2レンズ素子
L3 第3レンズ素子
L4 第4レンズ素子
L5 第5レンズ素子
L6 第6レンズ素子
L7 第7レンズ素子
L8 第8レンズ素子
L9 第9レンズ素子
A 開口絞り
P 平行平板
S 像面
1 ズームレンズ系
2 撮像素子
3 液晶モニタ
4 筐体
5 主鏡筒
6 移動鏡筒
7 円筒カム
Claims (16)
- 物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、物体側の1枚の負レンズ素子と像側の1枚の正レンズ素子との接合レンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a)を満足する、ズームレンズ系:
νdL12<43.50 ・・・(1)
fT/fW≧6.0 ・・・(a)
ここで、
νdL12:第1レンズ群の正レンズ素子のd線に対するアッベ数、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。 - 以下の条件(3)を満足する、請求項1に記載のズームレンズ系:
-30.0<fG2/tL21<-5.0 ・・・(3)
ここで、
fG2:第2レンズ群の合成焦点距離、
tL21:第2レンズ群の最物体側レンズ素子の光軸上の厚み
である。 - 以下の条件(4)を満足する、請求項1に記載のズームレンズ系:
0.5<LT/fT<2.5 ・・・(4)
ここで、
LT:望遠端におけるレンズ全長(第1レンズ群の最物体側面から像面までの距離)、
fT:望遠端での全系の焦点距離
である。 - 以下の条件(5)を満足する、請求項1に記載のズームレンズ系:
3.5<fG1/|fG2|<6.0 ・・・(5)
ここで、
fG1:第1レンズ群の合成焦点距離、
fG2:第2レンズ群の合成焦点距離
である。 - 以下の条件(6)を満足する、請求項1に記載のズームレンズ系:
0.5<fT/fG1<3.0 ・・・(6)
ここで、
fG1:第1レンズ群の合成焦点距離、
fT:望遠端での全系の焦点距離
である。 - 以下の条件(7)を満足する、請求項1に記載のズームレンズ系:
2.0<β2T/β2W<6.5 ・・・(7)
ここで、
β2T:望遠端かつ無限遠合焦状態における第2レンズ群の横倍率、
β2W:広角端かつ無限遠合焦状態における第2レンズ群の横倍率
である。 - 物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、請求項1に記載のズームレンズ系である、撮像装置。 - 物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、請求項1に記載のズームレンズ系である、カメラ。 - 物体側から像側へと順に、正のパワーを有する第1レンズ群と、負のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
前記第1レンズ群が、2枚のレンズ素子で構成され、
前記第4レンズ群が、1枚のレンズ素子で構成され、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群、第2レンズ群、第3レンズ群及び第4レンズ群を、各レンズ群とレンズ群との間の空気間隔が変化するように光軸に沿ってそれぞれ移動させて変倍を行い、
前記第3レンズ群が3枚のレンズ素子で構成され、これら3枚のレンズ素子のうち少なくとも1枚か、又は、前記第3レンズ群を構成するレンズ素子のうち少なくとも2枚が、以下の条件(2)を満足し、
かつ以下の条件(a)を満足する、ズームレンズ系:
ここで、
νdL3n:第3レンズ群の各レンズ素子の、d線に対するアッベ数、
PgFL3n:第3レンズ群の各レンズ素子の、次式で表される部分分散比、
PgFL3n=(ng-nF)/(nF-nC)、
ng:g線に対する屈折率、
nF:F線に対する屈折率、
nC:C線に対する屈折率、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。 - 以下の条件(3)を満足する、請求項9に記載のズームレンズ系:
-30.0<fG2/tL21<-5.0 ・・・(3)
ここで、
fG2:第2レンズ群の合成焦点距離、
tL21:第2レンズ群の最物体側レンズ素子の光軸上の厚み
である。 - 以下の条件(4)を満足する、請求項9に記載のズームレンズ系:
0.5<LT/fT<2.5 ・・・(4)
ここで、
LT:望遠端におけるレンズ全長(第1レンズ群の最物体側面から像面までの距離)、
fT:望遠端での全系の焦点距離
である。 - 以下の条件(5)を満足する、請求項9に記載のズームレンズ系:
3.5<fG1/|fG2|<6.0 ・・・(5)
ここで、
fG1:第1レンズ群の合成焦点距離、
fG2:第2レンズ群の合成焦点距離
である。 - 以下の条件(6)を満足する、請求項9に記載のズームレンズ系:
0.5<fT/fG1<3.0 ・・・(6)
ここで、
fG1:第1レンズ群の合成焦点距離、
fT:望遠端での全系の焦点距離
である。 - 以下の条件(7)を満足する、請求項9に記載のズームレンズ系:
2.0<β2T/β2W<6.5 ・・・(7)
ここで、
β2T:望遠端かつ無限遠合焦状態における第2レンズ群の横倍率、
β2W:広角端かつ無限遠合焦状態における第2レンズ群の横倍率
である。 - 物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、請求項9に記載のズームレンズ系である、撮像装置。 - 物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、請求項9に記載のズームレンズ系である、カメラ。
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US13/393,540 US8665532B2 (en) | 2009-10-19 | 2010-10-18 | Zoom lens system, imaging device and camera |
CN201080034302.0A CN102472885B (zh) | 2009-10-19 | 2010-10-18 | 变焦透镜系统、拍摄装置及照相机 |
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JP2011145473A (ja) * | 2010-01-14 | 2011-07-28 | Nikon Corp | ズームレンズ、光学機器、およびズームレンズの製造方法 |
JP2014222336A (ja) * | 2013-05-14 | 2014-11-27 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
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