WO2012101959A1 - 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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- WO2012101959A1 WO2012101959A1 PCT/JP2012/000065 JP2012000065W WO2012101959A1 WO 2012101959 A1 WO2012101959 A1 WO 2012101959A1 JP 2012000065 W JP2012000065 W JP 2012000065W WO 2012101959 A1 WO2012101959 A1 WO 2012101959A1
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- Prior art keywords
- lens
- lens group
- zoom lens
- zoom
- lens system
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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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 +-++
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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
- G02B15/145—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 five groups only
- G02B15/1451—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 five groups only the first group being positive
- G02B15/145121—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 five 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 has a high zooming ratio with a high zooming ratio as well as a high zooming ratio and a high performance and a thin zoom lens system, and an imaging apparatus including the zoom lens system.
- a thin and compact camera including the imaging device.
- a camera having an image sensor that performs photoelectric conversion such as a digital still camera or a digital video camera
- a particularly high demand for correction of aberrations along with a reduction in thickness and a high zooming ratio For example, 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 or a negative power, and the following Various zoom lens systems having three or more positive / negative / positive / negative / negative groups in which a lens group is arranged have been proposed.
- a camera having an image sensor that performs photoelectric conversion such as a digital still camera or a digital video camera, is simply referred to as a digital camera.
- Japanese Patent Application Laid-Open No. 2010-237455 has a configuration of three or more positive and negative groups, and the lens group so that the distance between the first lens group and the second lens group is wider at the telephoto end than at the wide-angle end.
- zooming is performed, and the first lens group has at least one negative lens, and the Abbe number and the partial dispersion ratio of the material of the negative lens are defined.
- Japanese Patent Application Laid-Open No. 2009-265652 has a configuration of three or more positive / negative / positive / negative / negative groups, and all the lens groups are arranged along the optical axis so that the distance between the lens groups changes during zooming.
- a zoom lens system is disclosed in which the second lens group, counting from the image side, moves in the direction along the optical axis during focusing.
- Japanese Patent Application Laid-Open No. 2009-175736 has a configuration of three or more groups of positive / negative / positive / negative / negative, and the first lens unit draws a reciprocal locus convex toward the image side at the time of zooming from the wide angle end to the telephoto end.
- a zoom lens is disclosed in which the second lens group moves toward the image side and the amount of movement from the wide-angle end to the intermediate focal length of the first lens group is positive.
- Japanese Patent Laid-Open No. 2009-009121 has a configuration of three or more positive and negative groups, and the combined refractive power of the rear group including the third lens group and the subsequent lens group on the image side is positive.
- a zoom lens system is disclosed in which the ratio of the focal length of the lens group to the focal length of the entire system at the wide-angle end, and the ratio of the combined focal length of the rear group to the focal length of the entire system at the telephoto end are defined.
- Japanese Patent Laid-Open No. 2007-108398 has a configuration of three or more positive and negative groups, and the combined refractive power of the rear group including the third lens group and the subsequent lens group on the image side is positive. Zooming is performed by changing the distance between the lens group and the second lens group and the distance between the second lens group and the rear group, and the second lens group has three negative lenses and two positive lenses, There is disclosed a zoom lens in which the Abbe number and the partial dispersion ratio of the positive lens material having the strongest positive refractive power in the lens group are defined.
- Japanese Patent Application Laid-Open No. 10-111455 has a configuration of three or more positive and negative groups, the fourth lens group has a negative refractive power, the fifth lens group has a positive refractive power, and has a wide-angle end.
- JP 2010-237455 A JP 2009-265652 A JP 2009-175736 A JP 2009-009121 A JP 2007-108398 A Japanese Patent Laid-Open No. 10-111455
- An object of the present invention is not only high resolution but also high zooming ratio, low aberration variation during zooming, high performance, and thin zoom lens system, and imaging including the zoom lens system An apparatus and a thin and compact camera provided with the imaging device.
- zoom lens system From the object side to the image side, A first lens group having positive power; A second lens group having negative power; A third lens group having positive power; A fourth lens group having power; An aperture stop disposed between the third lens group and the fourth lens group;
- the third lens group has two or more lens elements and one or more inter-lens air spaces;
- 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 From the object side to the image side, A first lens group having positive power; A second lens group having negative power; A third lens group having positive power; A fourth lens group having power; An aperture stop disposed between the third lens group and the fourth lens group;
- the third lens group has two or more lens elements and one or more inter-lens air spaces;
- 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 From the object side to the image side, A first lens group having positive power; A second lens group having negative power; A third lens group having positive power; A fourth lens group having power; An aperture stop disposed between the third lens group and the fourth lens group;
- the third lens group has two or more lens elements and one or more inter-lens air spaces;
- the resolution is high, but also a high zooming ratio and a high performance with little aberration fluctuation during zooming, and a thin zoom lens system, and imaging including the zoom lens system
- An apparatus and a thin and compact camera including the imaging device 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. 16 is a schematic configuration diagram of a digital still camera according to the sixth embodiment.
- FIGS. 1, 4, 7, 10 and 13 all show a zoom lens system in an infinitely focused state.
- (a) shows the lens configuration at the wide-angle end
- (b) shows the lens configuration at the intermediate position
- (c) shows the lens configuration at the telephoto end.
- the wide-angle end in the shortest focal length condition, representing the focal length f W.
- the intermediate position is an intermediate focal length state
- the telephoto end with the longest focal length condition, representing the focal length f T.
- FIGS. 1, 4, 7 and 13 show the direction in which a later-described fourth lens group G4 moves during focusing from the infinite focus state to the close object focus state
- the zoom lens system according to Embodiment 5 includes, in order from the object side to the image side, a first lens group G1 having a positive power, a second lens group G2 having a negative power, and a first lens group having a positive power.
- 3 lens group G3 and 4th lens group G4 which has positive power are provided.
- the distance between the lens groups that is, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group G3.
- the lens group G2, the third lens group G3, and the fourth lens group G4 move in the direction along the optical axis.
- the distance between the lens groups that is, the distance between the first lens group G1 and the second lens group G2, and the distance between the second lens group G2 and the third lens group G3.
- All the lens groups were along the optical axis so that the distance, the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5 all changed. Move in each direction.
- the distance between the lens groups that is, the distance between the first lens group G1 and the second lens group G2, and the distance between the second lens group G2 and the third lens group G3. All the lens groups move in the direction along the optical axis so that both the distance and the distance between the third lens group G3 and the fourth lens group G4 change.
- the zoom lens system according to each embodiment can reduce the size of the entire lens system while maintaining high optical performance by arranging these lens groups in a desired power arrangement.
- 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.
- the image plane S and the fifth lens group G5 in FIG. 1, 4, 7 and 10 are the object side of the image plane S. 13, between the image plane S and the most image side lens surface of the fourth lens group G4 in FIG. 13, is a parallel flat plate equivalent to an optical low-pass filter, a face plate of an image sensor, or the like. P is provided.
- the first lens group G1 is a negative meniscus first lens element L1 having a convex surface directed toward the object side in order from the object side to the image side.
- a positive meniscus second lens element L2 having a convex surface facing the object side
- a positive meniscus third lens element L3 having a convex surface facing the object side.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the first lens element L1 and the second lens element L2 Surface number 2 is given to the agent layer.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus fourth lens element L4 with a convex surface facing the object side, and a convex surface facing the image side. And a negative meniscus fifth lens element L5 and a biconvex sixth lens element L6.
- the fourth lens element L4 has two aspheric surfaces.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a biconvex eighth lens element L8, and both It consists of a concave ninth lens element L9 and a biconvex tenth lens element L10.
- the eighth lens element L8 and the ninth lens element L9 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the eighth lens element L8 and the ninth lens element L9.
- Surface number 16 is given to the agent layer.
- the seventh lens element L7 has two aspheric surfaces.
- the fourth lens unit G4 comprises solely a negative meniscus eleventh lens element L11 with the convex surface facing the object side.
- the fifth lens unit G5 comprises solely a bi-convex twelfth lens element L12.
- the twelfth lens element L12 has two aspheric surfaces.
- an aperture stop A is provided between the third lens group G3 and the fourth lens group G4.
- the aperture stop A moves on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
- a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the twelfth lens element L12.
- the zoom lens system according to Embodiment 1 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 and the fourth lens group G4 move to the object side substantially monotonously, and the second The lens group G2 moves toward the image side along a convex locus on the image side, the third lens group G3 moves monotonously to the object side, and the fifth lens group G5 is fixed with respect to the image plane S. ing. That is, during zooming, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 and the fourth lens.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens so that the distance between the group G4 changes and the distance between the fourth lens group G4 and the fifth lens group G5 increases.
- the group G4 moves along the optical axis.
- the fourth lens group G4 moves toward the image side along the optical axis during focusing from the infinite focus state to the close object focus state.
- the first lens unit G1 includes a negative meniscus first lens element L1 having a convex surface directed toward the object side in order from the object side to the image side. And a positive meniscus second lens element L2 having a convex surface facing the object side, and a positive meniscus third lens element L3 having a convex surface facing the object side.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the first lens element L1 and the second lens element L2 Surface number 2 is given to the agent layer.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus fourth lens element L4 having a convex surface directed toward the object side, and a biconcave second lens element L4. It consists of five lens elements L5 and a biconvex sixth lens element L6. Among these, the fourth lens element L4 has two aspheric surfaces.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7 and a positive meniscus shape first lens with the convex surface facing the object side. It comprises an eight lens element L8, a negative meniscus ninth lens element L9 with a convex surface facing the object side, and a biconvex tenth lens element L10. Among these, the eighth lens element L8 and the ninth lens element L9 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the eighth lens element L8 and the ninth lens element L9. Surface number 16 is given to the agent layer.
- the seventh lens element L7 has two aspheric surfaces.
- the fourth lens unit G4 comprises solely a negative meniscus eleventh lens element L11 with the convex surface facing the object side.
- the fifth lens unit G5 comprises solely a bi-convex twelfth lens element L12.
- the twelfth lens element L12 has two aspheric surfaces.
- an aperture stop A is provided between the third lens group G3 and the fourth lens group G4.
- the aperture stop A moves on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
- a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the twelfth lens element L12.
- the first lens group G1 moves toward the object side while drawing a convex locus on the image side.
- the lens group G2 moves toward the image side along a convex locus on the image side
- the third lens group G3 moves toward the object side substantially monotonically
- the fourth lens group G4 moves toward the object side monotonously.
- the fifth lens group G5 is fixed with respect to the image plane S. That is, during zooming, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 and the fourth lens.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens so that the distance between the group G4 changes and the distance between the fourth lens group G4 and the fifth lens group G5 increases.
- the group G4 moves along the optical axis.
- the fourth lens group G4 moves toward the image side along the optical axis during focusing from the infinite focus state to the close object focus state.
- the first lens group G1 is a negative meniscus first lens element L1 having a convex surface directed toward the object side in order from the object side to the image side.
- a biconvex second lens element L2 and a positive meniscus third lens element L3 having a convex surface facing the object side.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the first lens element L1 and the second lens element L2 Surface number 2 is given to the agent layer.
- the second lens unit G2 includes, in order from the object side to the image side, a negative meniscus fourth lens element L4 with a convex surface facing the object side, and a convex surface facing the image side. And a negative meniscus fifth lens element L5 and a biconvex sixth lens element L6.
- the fourth lens element L4 has two aspheric surfaces.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7 and a positive meniscus shape first lens with the convex surface facing the object side. It comprises an eight lens element L8, a negative meniscus ninth lens element L9 with a convex surface facing the object side, and a biconvex tenth lens element L10. Among these, the eighth lens element L8 and the ninth lens element L9 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the eighth lens element L8 and the ninth lens element L9. Surface number 16 is given to the agent layer.
- the seventh lens element L7 has two aspheric surfaces.
- the fourth lens unit G4 comprises solely a negative meniscus eleventh lens element L11 with the convex surface facing the object side.
- the fifth lens unit G5 comprises solely a bi-convex twelfth lens element L12.
- the twelfth lens element L12 has two aspheric surfaces.
- an aperture stop A is provided between the third lens group G3 and the fourth lens group G4.
- the aperture stop A moves on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
- a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the twelfth lens element L12.
- the zoom lens system according to Embodiment 3 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves substantially monotonically to the object side, and the second lens group G2 The third lens group G3 moves monotonously to the object side, and the fourth lens group G4 moves to the object side while drawing a convex locus on the image side.
- the fifth lens group G5 is fixed with respect to the image plane S. That is, during zooming, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 and the fourth lens.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens so that the distance between the group G4 changes and the distance between the fourth lens group G4 and the fifth lens group G5 increases.
- the group G4 moves along the optical axis.
- the fourth lens group G4 moves toward the image side along the optical axis during focusing from the infinite focus state to the close object focus state.
- the first lens unit 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 positive meniscus second lens element L2 having a convex surface facing the object side, and a positive meniscus third lens element L3 having a convex surface facing the object side.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the first lens element L1 and the second lens element L2 Surface number 2 is given to the agent layer.
- the second lens group G2 includes, in order from the object side to the image side, a negative meniscus fourth lens element L4 with a convex surface directed toward the object side, and a biconcave second lens element L4. It consists of five lens elements L5 and a biconvex sixth lens element L6. Among these, the fourth lens element L4 has two aspheric surfaces, and the fifth lens element L5 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a biconvex eighth lens element L8, and both It consists of a concave ninth lens element L9.
- the eighth lens element L8 and the ninth lens element L9 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the eighth lens element L8 and the ninth lens element L9.
- Surface number 16 is given to the agent layer.
- the seventh lens element L7 has two aspheric surfaces
- the ninth lens element L9 has an aspheric image side surface.
- the fourth lens unit G4 comprises solely a negative meniscus tenth lens element L10 with the convex surface facing the object side.
- the tenth lens element L10 has an aspheric object side surface.
- the fifth lens unit G5 comprises solely a bi-convex eleventh lens element L11.
- the eleventh lens element L11 has two aspheric surfaces.
- an aperture stop A is provided between the third lens group G3 and the fourth lens group G4.
- the aperture stop A moves on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
- a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the eleventh lens element L11.
- the zoom lens system according to Embodiment 4 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 and the third lens group G3 move to the object side substantially monotonously, and the second The lens group G2 and the fifth lens group G5 move to the image side substantially monotonously, and the fourth lens group G4 slightly moves to the object side. That is, during zooming, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 and the fourth lens.
- the group G4 and the fifth lens group G5 move along the optical axis.
- the fifth lens group G5 moves toward the object side along the optical axis when focusing from the infinite focus state to the close object focus state.
- the first lens unit 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 and a positive meniscus third lens element L3 having a convex surface facing the object side.
- the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical example described later, the adhesion between the first lens element L1 and the second lens element L2 Surface number 2 is given to the agent layer.
- the second lens unit G2 includes, in order from the object side to the image side, a negative meniscus fourth lens element L4 with a convex surface directed toward the object side, and a biconcave second lens element L4. 5 lens elements L5 and a positive meniscus sixth lens element L6 having a convex surface facing the object side.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a biconvex eighth lens element L8, and both It consists of a concave ninth lens element L9.
- the eighth lens element L8 and the ninth lens element L9 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the eighth lens element L8 and the ninth lens element L9. Surface number 16 is given to the agent layer.
- the eighth lens element L8 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a positive meniscus tenth lens element L10 with the convex surface facing the object side.
- the tenth lens element L10 has two aspheric surfaces.
- an aperture stop A is provided between the third lens group G3 and the fourth lens group G4.
- the aperture stop A moves on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
- a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the tenth lens element L10.
- the zoom lens system according to Embodiment 5 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 and the third lens group G3 move substantially monotonically to the object side, and the second The lens group G2 moves to the image side in a substantially monotonous manner, and the fourth lens group G4 moves to the image side while drawing a convex locus on the object side. That is, during zooming, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 and the fourth lens.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 move along the optical axis so that the distance from the group G4 changes.
- the fourth lens group G4 moves toward the object side along the optical axis during focusing from the infinite focus state to the close object focus state.
- the aperture stop A is disposed between the third lens group G3 and the fourth lens group G4, and zooming from the wide-angle end to the telephoto end during imaging is performed. Moreover, since the aperture stop A moves along the optical axis integrally with the third lens group G3, the entire lens system can be reduced in size while maintaining high optical performance.
- the zoom lens systems according to Embodiments 1 to 5 since the third lens group G3 has two or more lens elements and one or more inter-lens air spaces, the aberration is corrected satisfactorily. Therefore, the entire lens system can be downsized while maintaining a high optical performance and a high zooming ratio.
- the fourth lens group G4 is composed of one lens element, so that the entire lens system can be reduced in size.
- rapid focusing is facilitated when focusing from an infinite focus state to a close object focus state.
- the zoom lens systems according to Embodiments 1 to 4 since the fifth lens group G5 is composed of one lens element, the entire lens system can be reduced in size. In the zoom lens system according to Embodiment 4, rapid focusing is facilitated when focusing from an infinitely focused state to a close object focused state.
- the fourth lens group G4 or the fifth lens group G5 moves along the optical axis during focusing from the infinite focus state to the close object focus state. Therefore, high optical performance can be maintained even in the proximity object in-focus state.
- the zoom lens system according to Embodiments 1 to 4 has a five-group configuration
- the zoom lens system according to Embodiment 5 has a four-group configuration.
- the lens groups constituting the lens system There is no particular limitation on the number of. Further, there is no particular limitation on the power of the fourth lens group and the lens group located on the image side of the fourth lens group.
- Image point movement due to vibration of the entire system is corrected by moving one of the fourth lens group G4 or a part of each lens group in a direction perpendicular to the optical axis. That is, it is possible to optically correct image blur due to camera shake, vibration, or the like.
- 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.
- a zoom lens system such as the zoom lens systems according to Embodiments 1 to 5
- 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, a second lens group having a negative power, and a positive power A third lens group having a power, a fourth lens group having power, and an aperture stop disposed between the third lens group and the fourth lens group for zooming from the wide-angle end to the telephoto end during imaging.
- the first lens group, the second lens group, and the third lens group are moved along the optical axis to perform zooming, and the third lens group includes two or more lens elements and one or more lenses.
- a zoom lens system having an inter-element air gap satisfies the following conditions (1) and (a).
- a lens configuration of the zoom lens system is referred to as a basic configuration of the embodiment.
- the condition (a) is a condition for defining the ratio between the focal length of the entire system at the wide-angle end and the focal length of the entire system at the telephoto end. Since the zoom lens system having the basic configuration satisfies the condition (a), it has a high zooming ratio and can ensure a high magnification.
- the condition (1) is a condition for defining 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 condition (1) is not reached, the focal length of the second lens group becomes too small, and the aberration fluctuation at the time of zooming becomes large, making it difficult to correct the aberration. In addition, the focal length of the first lens group becomes too large, and the amount of movement of the first lens group necessary for securing a high magnification becomes too large, thereby providing a compact lens barrel, imaging device, and camera. It becomes difficult.
- the focal length of the first lens group becomes too small, the aberration fluctuation at the time of zooming becomes large, making it difficult to correct the aberration, and the diameter of the first lens group is also large. Therefore, it becomes difficult to provide a compact lens barrel, imaging device, and camera. Further, the error sensitivity with respect to the tilt of the first lens group becomes too high, and it may be difficult to assemble the optical system.
- condition (1) is preferably satisfied under the following condition (a) ′. f T / f W > 13.0 (a) ′
- the zoom lens system having the basic configuration like the zoom lens systems according to Embodiments 1 to 5 preferably satisfies the following condition (2).
- f 1 composite focal length of the first lens group
- f 4 the combined focal length of the fourth lens group.
- the condition (2) is a condition for defining the ratio between the focal length of the first lens group and the focal length of the fourth lens group. If the lower limit of condition (2) is not reached, the focal length of the fourth lens group becomes too large, and the amount of movement of the fourth lens group becomes too large, thereby providing a compact lens barrel, imaging device, and camera. It becomes difficult. In addition, since the focal length of the first lens unit becomes too small, the aberration fluctuation at the time of zooming becomes large and it becomes difficult to correct the aberration, and the diameter of the first lens unit becomes large. It becomes difficult to provide a cylinder, an imaging device, and a camera. Further, the error sensitivity with respect to the tilt of the first lens group becomes too high, and it may be difficult to assemble the optical system.
- the above effect can be further achieved by further satisfying at least one of the following conditions (2) ′ and (2) ′′.
- condition (2), (2) ′ and (2) ′′ are satisfied in the condition (a) ′.
- the zoom lens system having the basic configuration like the zoom lens systems according to Embodiments 1 to 5 preferably satisfies the following condition (3). 0.8 ⁇ L T / f T ⁇ 1.4 (3) here, 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.
- the condition (3) is a condition for defining the ratio between the total lens length at the telephoto end and the focal length of the entire system at the telephoto end. If the lower limit of condition (3) is not reached, the total lens length at the telephoto end becomes too short, the focal length of each lens group becomes too small, and the aberration fluctuation at the time of zooming becomes large, making it difficult to correct the aberration. . If the upper limit of condition (3) is exceeded, the total lens length at the telephoto end becomes too short, making it difficult to provide a compact lens barrel, imaging device, and camera.
- the above effect can be further achieved by further satisfying at least one of the following conditions (3) ′ and (3) ′′. 0.9 ⁇ L T / f T (3) ′ L T / f T ⁇ 1.2 ⁇ (3) ''
- condition (3), (3) ′ and (3) ′′ are satisfied in the condition (a) ′.
- Each lens group constituting the zoom lens system according to Embodiments 1 to 5 is a refractive lens element that deflects incident light by refraction, that is, a type in which deflection is performed at an interface between media having different refractive indexes.
- the present invention is not limited to this.
- a diffractive 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, and a refractive index that deflects incident light according to the refractive index distribution in the medium
- Each lens group may be composed of a distributed lens element or the like.
- the object side of the image plane S that is, between the image plane S and the most image side lens surface of the fifth lens group G5 in the first to fourth embodiments, and in the fifth embodiment, the image plane S.
- the parallel plate P equivalent to the optical low-pass filter, the face plate of the image sensor, or the like is disposed between the lens surface and the most image side lens surface of the fourth lens group G4.
- a birefringent low-pass filter made of quartz or the like with a predetermined crystal axis direction adjusted, a phase-type low-pass filter that achieves a required optical cutoff frequency characteristic by a diffraction effect, and the like can be applied.
- FIG. 16 is a schematic configuration diagram of a digital still camera according to the sixth 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 As the zoom lens system 1, the zoom lens system according to Embodiment 1 is used.
- the zoom lens system 1 includes a first lens group G1, a second lens group G2, a third lens group G3, an aperture stop A, a fourth lens group G4, and a fifth lens group G5. It is configured.
- the zoom lens system 1 is disposed on the front side, and 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 third lens group G3, the aperture stop A, the fourth lens group G4, and the fifth lens group G5 are predetermined with respect to the imaging device 2. It is possible to perform zooming from the wide-angle end to the telephoto end.
- 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 overall lens length when not in use. it can.
- the digital still camera shown in FIG. 16 may use any of the zoom lens systems according to Embodiments 2 to 5 instead of the zoom lens system according to Embodiment 1.
- the optical system of the digital still camera shown in FIG. 16 can 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 fifth embodiments is shown as the zoom lens system 1, but these zoom lens systems need to use all zooming areas. There is no. That is, a range in which the optical performance is ensured according to a desired zooming area may be cut out and used as a zoom lens system having a lower magnification than the zoom lens system described in the first to fifth embodiments.
- the 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 the 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 5 described above and an imaging element such as a CCD or a CMOS is used as a mobile information terminal such as a smartphone, a personal digital assistance, or a surveillance camera in a surveillance system. It can also be applied to Web cameras, in-vehicle cameras, and the like.
- the unit of length in the table is “mm”, and the unit of angle of view is “°”.
- r is a radius of curvature
- d is a surface interval
- nd is a refractive index with respect to the d line
- vd is an Abbe number with respect to the d line.
- the surface marked with * is an aspherical surface
- the aspherical shape is defined by the following equation.
- ⁇ is a conic constant
- A4, A6, A8, A10, A12, and A14 are fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, and fourteenth-order aspheric coefficients, respectively.
- 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, astigmatism, and distortion aberration in order from the left side.
- spherical aberration is represented by SA (mm)
- astigmatism is represented by AST (mm)
- distortion is represented by DIS (%).
- the vertical axis represents the F number
- the solid line is the d-line with a wavelength of 587.56 nm
- the short broken line is the F-line with a wavelength of 486.13 nm
- the long broken line is the characteristic of the C-line with a wavelength of 656.28 nm.
- the vertical axis represents the image height
- the solid line represents the sagittal plane
- the broken line represents the meridional plane.
- the vertical axis represents the image height.
- the F number is F
- the image height is H
- the sagittal plane is s
- the meridional plane is m.
- 6, 9, 12 and 15 are lateral aberration diagrams at the telephoto end of the zoom lens systems according to Numerical Examples 1 to 5, respectively.
- 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 70% of the maximum image height
- the middle row shows the lateral aberration at the axial image point
- the lower row shows the lateral aberration at the image point of -70% of the maximum image height.
- the upper stage is the lateral aberration at the image point of 70% of the maximum image height
- the middle stage is the lateral aberration at the axial image point
- the lower stage is at the image point of -70% 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
- the short broken line is the F line
- the long broken line is the C line characteristic.
- the meridional plane is a plane including the optical axis of the first lens group G1 and the optical axis of the third lens group G3.
- the amount of movement in the direction perpendicular to the optical axis of the third lens group G3 in the image blur correction state at the telephoto end is as follows.
- Numerical example 1 0.094 mm
- Numerical example 2 0.082 mm
- Numerical example 3 0.105 mm
- Numerical example 4 0.125 mm
- Numerical example 5 0.197 mm
- 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 16 shows the 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 camera, a portable information terminal such as a smartphone, a personal digital assistance, a surveillance camera in a surveillance system, a web camera, an in-vehicle camera, etc. It is suitable for a photographing optical system that requires high image quality.
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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、
パワーを有する第4レンズ群と、
前記第3レンズ群と前記第4レンズ群との間に配置した開口絞りとを備え、
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、前記第2レンズ群及び前記第3レンズ群を光軸に沿って移動させて変倍を行い、
前記第3レンズ群が、2枚以上のレンズ素子と、1つ以上のレンズ素子間空気間隔とを有し、
以下の条件(1)及び(a):
-7.0<f1/f2<-4.0 ・・・(1)
fT/fW>9.0 ・・・(a)
(ここで、
f1:第1レンズ群の合成焦点距離、
f2:第2レンズ群の合成焦点距離、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離
である)
を満足することを特徴とする、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、
パワーを有する第4レンズ群と、
前記第3レンズ群と前記第4レンズ群との間に配置した開口絞りとを備え、
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、前記第2レンズ群及び前記第3レンズ群を光軸に沿って移動させて変倍を行い、
前記第3レンズ群が、2枚以上のレンズ素子と、1つ以上のレンズ素子間空気間隔とを有し、
以下の条件(1)及び(a):
-7.0<f1/f2<-4.0 ・・・(1)
fT/fW>9.0 ・・・(a)
(ここで、
f1:第1レンズ群の合成焦点距離、
f2:第2レンズ群の合成焦点距離、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離
である)
を満足する
ことを特徴と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、
パワーを有する第4レンズ群と、
前記第3レンズ群と前記第4レンズ群との間に配置した開口絞りとを備え、
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、前記第2レンズ群及び前記第3レンズ群を光軸に沿って移動させて変倍を行い、
前記第3レンズ群が、2枚以上のレンズ素子と、1つ以上のレンズ素子間空気間隔とを有し、
以下の条件(1)及び(a):
-7.0<f1/f2<-4.0 ・・・(1)
fT/fW>9.0 ・・・(a)
(ここで、
f1:第1レンズ群の合成焦点距離、
f2:第2レンズ群の合成焦点距離、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離
である)
を満足する
ことを特徴とするズームレンズ系である、カメラ
に関する。
図1、4、7、10及び13は、各々実施の形態1~5に係るズームレンズ系のレンズ配置図である。
-7.0<f1/f2<-4.0 ・・・(1)
fT/fW>9.0 ・・・(a)
ここで、
f1:第1レンズ群の合成焦点距離、
f2:第2レンズ群の合成焦点距離、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離
である。
fT/fW>13.0 ・・・(a)’
0.5<|f1/f4|<4.2 ・・・(2)
ここで、
f1:第1レンズ群の合成焦点距離、
f4:第4レンズ群の合成焦点距離
である。
1.5<|f1/f4| ・・・(2)’
|f1/f4|<3.0 ・・・(2)’’
0.8<LT/fT<1.4 ・・・(3)
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:望遠端における全系の焦点距離
である。
0.9<LT/fT ・・・(3)’
LT/fT<1.2 ・・・(3)’’
図16は、実施の形態6に係るデジタルスチルカメラの概略構成図である。図16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16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、第3レンズ群G3と、開口絞りAと、第4レンズ群G4と、第5レンズ群G5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。
数値実施例1 0.094mm
数値実施例2 0.082mm
数値実施例3 0.105mm
数値実施例4 0.125mm
数値実施例5 0.197mm
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 39.12230 0.75000 1.84666 23.8
2 24.34130 0.01000 1.56732 42.8
3 24.34130 2.57250 1.49700 81.6
4 669.01800 0.15000
5 24.12950 1.79680 1.72916 54.7
6 79.16250 可変
7* 40.41520 0.50000 1.87702 37.0
8* 4.92640 3.70580
9 -8.33810 0.30000 1.72916 54.7
10 -88.01810 0.22870
11 27.63010 1.21460 1.94595 18.0
12 -34.07630 可変
13* 5.61650 2.15450 1.58332 59.1
14* -22.78570 0.50340
15 8.07340 1.26250 1.49700 81.6
16 -490.35460 0.01000 1.56732 42.8
17 -490.35460 0.30000 1.90366 31.3
18 4.81270 0.35810
19 12.15960 1.20290 1.52996 55.8
20 -11.64830 0.40000
21(絞り) ∞ 可変
22 30.16120 0.50000 1.88300 40.8
23 8.20900 可変
24* 9.68560 2.23030 1.52996 55.8
25* -93.78700 2.36430
26 ∞ 0.78000 1.51680 64.2
27 ∞ (BF)
像面 ∞
第7面
K= 0.00000E+00, A4=-5.63481E-04, A6= 3.11555E-05, A8=-8.17750E-07
A10= 8.06105E-09, A12= 0.00000E+00
第8面
K= 0.00000E+00, A4=-8.76674E-04, A6=-1.12420E-05, A8= 2.70324E-06
A10=-1.33807E-07, A12= 0.00000E+00
第13面
K= 0.00000E+00, A4=-7.29201E-04, A6=-1.17969E-05, A8=-6.10823E-06
A10= 6.74583E-07, A12=-4.48240E-08
第14面
K= 0.00000E+00, A4= 8.59168E-05, A6=-2.47587E-05, A8=-1.87567E-06
A10= 1.46231E-07, A12=-2.05601E-08
第24面
K= 0.00000E+00, A4=-6.47588E-04, A6= 8.67198E-05, A8=-5.62682E-06
A10= 1.93110E-07, A12=-4.72323E-09
第25面
K= 0.00000E+00, A4=-7.33472E-04, A6= 3.89493E-05, A8=-1.04425E-06
A10=-4.32516E-08, A12= 0.00000E+00
ズーム比 14.71263
広角 中間 望遠
焦点距離 4.4482 17.0693 65.4446
Fナンバー 3.44055 4.49104 6.16167
画角 45.0718 12.6331 3.4043
像高 3.7000 3.9000 3.9000
レンズ全長 46.3632 51.3938 62.4654
BF 0.48241 0.50874 0.45483
d6 0.3000 10.7372 21.3604
d12 16.7953 5.1183 0.3000
d21 3.4276 9.1186 10.4391
d23 2.0635 2.6166 6.6167
入射瞳位置 11.0268 35.9621 125.0203
射出瞳位置 -11.4186 -20.0329 -54.5925
前側主点位置 13.8124 38.8475 112.6593
後側主点位置 41.9150 34.3246 -2.9791
単レンズデータ
レンズ 始面 焦点距離
1 1 -77.9069
2 3 50.7587
3 5 46.9551
4 7 -6.4393
5 9 -12.6519
6 11 16.2860
7 13 7.9466
8 15 15.9947
9 17 -5.2725
10 19 11.4258
11 22 -12.9111
12 24 16.6900
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 36.28987 5.27930 1.15149 3.09442
2 7 -5.85194 5.94910 0.35671 1.13559
3 13 9.23453 6.19140 -0.30820 1.47404
4 22 -12.91111 0.50000 0.36877 0.60037
5 24 16.68996 5.37460 0.13748 1.16482
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 7 -0.21205 -0.34104 -0.89535
3 13 -0.48200 -1.12114 -1.38610
4 22 1.66825 1.71504 2.01678
5 24 0.71886 0.71728 0.72051
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 31.08320 0.75000 1.84666 23.8
2 20.54660 0.01000 1.56732 42.8
3 20.54660 2.64550 1.49700 81.6
4 152.85880 0.15000
5 24.63830 1.66280 1.72916 54.7
6 107.30480 可変
7* 49.15490 0.50000 1.87702 37.0
8* 5.54240 3.71900
9 -10.64890 0.30000 1.72916 54.7
10 112.56090 0.22460
11 20.71430 1.29040 1.94595 18.0
12 -81.81860 可変
13* 5.43680 1.87130 1.58332 59.1
14* -22.36220 0.40260
15 6.57880 1.45360 1.49700 81.6
16 46.91020 0.01000 1.56732 42.8
17 46.91020 0.30000 1.90366 31.3
18 4.17360 0.30410
19 7.92300 1.07350 1.52996 55.8
20 -15.71980 0.40000
21(絞り) ∞ 可変
22 19.40140 0.50000 1.88300 40.8
23 5.56050 可変
24* 9.90500 2.27410 1.52996 55.8
25* -84.49410 2.25770
26 ∞ 0.78000 1.51680 64.2
27 ∞ (BF)
像面 ∞
第7面
K= 0.00000E+00, A4=-6.82260E-04, A6= 3.42662E-05, A8=-7.06863E-07
A10= 5.24073E-09, A12= 0.00000E+00
第8面
K= 0.00000E+00, A4=-8.55257E-04, A6=-2.08462E-06, A8= 2.57595E-06
A10=-7.86710E-08, A12= 0.00000E+00
第13面
K= 0.00000E+00, A4=-7.38915E-04, A6= 6.12372E-06, A8=-7.45037E-06
A10= 7.92758E-07, A12=-5.22500E-08
第14面
K= 0.00000E+00, A4= 1.71678E-04, A6= 7.80329E-06, A8=-4.99088E-06
A10= 3.22395E-07, A12=-2.42946E-08
第24面
K= 0.00000E+00, A4=-4.14254E-04, A6= 1.04417E-04, A8=-5.96937E-06
A10= 1.47200E-07, A12=-3.27839E-09
第25面
K= 0.00000E+00, A4=-8.50740E-04, A6= 9.56957E-05, A8=-5.15879E-06
A10= 3.50417E-08, A12= 0.00000E+00
ズーム比 11.03063
広角 中間 望遠
焦点距離 4.4498 14.8500 49.0837
Fナンバー 3.44101 4.73422 6.16062
画角 42.8989 14.5685 4.5571
像高 3.5000 3.9000 3.9000
レンズ全長 47.2343 46.2180 52.9687
BF 0.48722 0.48685 0.45643
d6 0.3000 8.1432 17.4571
d12 19.1524 6.1570 0.3000
d21 1.6677 4.6342 6.6017
d23 2.7478 3.9176 5.2743
入射瞳位置 12.0384 30.0889 89.9355
射出瞳位置 -10.1822 -16.6238 -24.5944
前側主点位置 14.6324 32.0509 42.8463
後側主点位置 42.7846 31.3680 3.8850
単レンズデータ
レンズ 始面 焦点距離
1 1 -74.0055
2 3 47.4464
3 5 43.4920
4 7 -7.1611
5 9 -13.3284
6 11 17.5816
7 13 7.6883
8 15 15.2143
9 17 -5.0866
10 19 10.0990
11 22 -8.9793
12 24 16.8698
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 33.79578 5.21830 1.12238 3.01496
2 7 -6.26139 6.03400 0.48676 1.44491
3 13 8.11525 5.81510 -0.43186 1.41460
4 22 -8.97929 0.50000 0.37862 0.60851
5 24 16.86977 5.31180 0.15727 1.19825
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 7 -0.25511 -0.37491 -0.84760
3 13 -0.35202 -0.75087 -1.02588
4 22 2.01596 2.14616 2.29086
5 24 0.72728 0.72730 0.72910
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 57.54400 0.75000 1.84666 23.8
2 32.90100 0.01000 1.56732 42.8
3 32.90100 2.61090 1.49700 81.6
4 -118.20340 0.15000
5 24.21850 1.52590 1.72916 54.7
6 50.97680 可変
7* 29.35900 0.50000 1.87702 37.0
8* 5.29960 4.05300
9 -7.89080 0.30000 1.72916 54.7
10 -60.13670 0.23680
11 41.52720 1.27550 1.94595 18.0
12 -26.55800 可変
13* 6.06960 2.37110 1.58332 59.1
14* -23.88150 0.31890
15 7.14320 1.38840 1.49700 81.6
16 109.61190 0.01000 1.56732 42.8
17 109.61190 0.30000 1.90366 31.3
18 4.95430 0.45800
19 23.14400 1.09800 1.52996 55.8
20 -12.30130 0.40000
21(絞り) ∞ 可変
22 30.20470 0.50000 1.88300 40.8
23 10.26950 可変
24* 10.66430 2.04270 1.52996 55.8
25* -98.22820 2.84340
26 ∞ 0.78000 1.51680 64.2
27 ∞ (BF)
像面 ∞
第7面
K= 0.00000E+00, A4=-7.15790E-04, A6= 3.34579E-05, A8=-6.64896E-07
A10= 4.88846E-09, A12= 0.00000E+00
第8面
K= 0.00000E+00, A4=-9.90606E-04, A6=-3.67284E-06, A8= 1.95498E-06
A10=-6.58573E-08, A12= 0.00000E+00
第13面
K= 0.00000E+00, A4=-6.16082E-04, A6=-3.68104E-07, A8=-5.75983E-06
A10= 5.43157E-07, A12=-2.72234E-08
第14面
K= 0.00000E+00, A4= 1.78340E-05, A6=-3.72044E-06, A8=-4.60879E-06
A10= 4.06332E-07, A12=-2.11784E-08
第24面
K= 0.00000E+00, A4=-1.08567E-03, A6= 1.14745E-04, A8=-6.05001E-06
A10= 1.55891E-07, A12=-2.89195E-09
第25面
K= 0.00000E+00, A4=-1.36541E-03, A6= 1.09701E-04, A8=-4.19438E-06
A10= 2.41875E-08, A12= 0.00000E+00
ズーム比 16.47230
広角 中間 望遠
焦点距離 4.4501 18.0934 73.3027
Fナンバー 3.44164 4.20219 6.16157
画角 41.5033 11.9452 3.0330
像高 3.4000 3.9000 3.9000
レンズ全長 49.0167 55.3864 70.1058
BF 0.49135 0.52241 0.45938
d6 0.3000 12.2557 24.4860
d12 18.5099 5.2649 0.3000
d21 3.6190 11.3314 12.4827
d23 2.1738 2.0894 8.4551
入射瞳位置 11.3371 38.4866 134.4812
射出瞳位置 -12.3397 -22.9441 -128.8978
前側主点位置 14.2438 42.6294 166.2455
後側主点位置 44.5666 37.2930 -3.1969
単レンズデータ
レンズ 始面 焦点距離
1 1 -92.0253
2 3 52.0843
3 5 61.7901
4 7 -7.4461
5 9 -12.4864
6 11 17.2815
7 13 8.5459
8 15 15.3058
9 17 -5.7498
10 19 15.3205
11 22 -17.8312
12 24 18.2708
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 41.06452 5.04680 1.21748 3.07560
2 7 -6.41603 6.36530 0.48274 1.30249
3 13 10.09615 6.34440 -0.66695 1.36063
4 22 -17.83121 0.50000 0.40711 0.63842
5 24 18.27085 5.66610 0.13161 1.09620
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 7 -0.20116 -0.32179 -0.83233
3 13 -0.49210 -1.25492 -1.58845
4 22 1.51412 1.51273 1.86297
5 24 0.72299 0.72129 0.72474
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 34.34930 0.65000 1.84666 23.8
2 21.47750 0.01000 1.56732 42.8
3 21.47750 2.03800 1.49700 81.6
4 147.07180 0.15000
5 26.49040 1.61860 1.77250 49.6
6 130.70190 可変
7* 57.01000 0.30000 1.84973 40.6
8* 5.45040 3.07830
9* -17.37380 0.40000 1.77200 50.0
10 41.76440 0.15010
11 15.48890 1.19800 1.94595 18.0
12 -395.30340 可変
13* 5.07260 1.87320 1.51776 69.9
14* -14.52160 0.29090
15 7.30900 1.14640 1.69680 55.5
16 -66.82490 0.01000 1.56732 42.8
17 -66.82490 0.30000 1.68400 31.3
18* 3.87590 0.50000
19(絞り) ∞ 可変
20* 12.63810 0.50000 1.68400 31.3
21 8.93930 可変
22* 26.96660 1.68640 1.58332 59.1
23* -17.12980 可変
24 ∞ 0.78000 1.51680 64.2
25 ∞ (BF)
像面 ∞
第7面
K= 0.00000E+00, A4=-8.94401E-04, A6= 6.21567E-05, A8=-1.98151E-06
A10= 2.99161E-08, A12=-1.77821E-10, A14= 0.00000E+00
第8面
K= 0.00000E+00, A4=-1.06030E-03, A6= 2.36965E-05, A8= 1.64213E-06
A10=-5.56501E-08, A12=-1.14121E-09, A14= 0.00000E+00
第9面
K= 0.00000E+00, A4= 5.29698E-05, A6=-3.68820E-06, A8= 3.32156E-07
A10=-6.16745E-09, A12= 0.00000E+00, A14= 0.00000E+00
第13面
K= 0.00000E+00, A4=-7.42045E-04, A6=-9.81495E-06, A8=-1.14627E-05
A10= 2.41648E-06, A12=-2.74102E-07, A14= 1.22994E-08
第14面
K= 0.00000E+00, A4= 6.07823E-04, A6=-6.47865E-05, A8= 4.56339E-06
A10=-2.28093E-07, A12=-1.28148E-08, A14= 3.13084E-09
第18面
K= 0.00000E+00, A4= 1.90160E-04, A6= 8.06372E-05, A8= 5.02360E-06
A10=-1.29991E-06, A12= 0.00000E+00, A14= 0.00000E+00
第20面
K= 0.00000E+00, A4=-3.85673E-04, A6= 1.93928E-05, A8=-8.23950E-07
A10= 4.98393E-09, A12= 0.00000E+00, A14= 0.00000E+00
第22面
K= 0.00000E+00, A4= 1.33733E-03, A6=-8.40850E-05, A8= 5.21020E-06
A10=-1.89946E-07, A12= 2.92945E-09, A14= 0.00000E+00
第23面
K= 0.00000E+00, A4= 1.25012E-03, A6=-9.34022E-05, A8= 5.55813E-06
A10=-2.00544E-07, A12= 3.06426E-09, A14= 0.00000E+00
ズーム比 9.39473
広角 中間 望遠
焦点距離 4.6466 14.2428 43.6536
Fナンバー 3.08881 4.92645 5.98483
画角 41.5422 15.0391 5.0055
像高 3.6000 3.9000 3.9000
レンズ全長 42.4542 46.6111 55.6771
BF 0.77933 0.75151 0.73920
d6 0.3000 7.6536 17.9500
d12 16.4289 6.0700 0.9031
d19 1.0129 6.9323 10.8336
d21 2.4853 3.9951 5.9037
d23 4.7679 4.5287 2.6676
入射瞳位置 11.0513 25.3144 75.1476
射出瞳位置 -11.4768 -31.6472 -99.8114
前側主点位置 13.9362 33.2959 99.8492
後側主点位置 37.8076 32.3683 12.0235
単レンズデータ
レンズ 始面 焦点距離
1 1 -69.2986
2 3 50.3333
3 5 42.7195
4 7 -7.1113
5 9 -15.8467
6 11 15.7790
7 13 7.5057
8 15 9.5156
9 17 -5.3467
10 20 -47.2491
11 22 18.2151
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 35.53500 4.46660 0.95744 2.62125
2 7 -7.38792 5.12640 -0.01273 0.71601
3 13 10.21334 4.12050 -2.05831 0.06771
4 20 -47.24910 0.50000 1.07343 1.25927
5 22 18.21508 1.68640 0.66066 1.26673
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 7 -0.28399 -0.39590 -0.88325
3 13 -0.56572 -1.19853 -1.46846
4 20 1.26345 1.28209 1.24347
5 22 0.64419 0.65885 0.76170
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 47.82760 0.75000 1.84666 23.8
2 28.21300 0.01000 1.56732 42.8
3 28.21300 3.27700 1.49700 81.6
4 -1107.87480 0.15000
5 25.29660 2.38300 1.72916 54.7
6 77.85170 可変
7 64.54210 0.30000 1.88300 40.8
8 5.72810 2.90780
9 -28.89180 0.30000 1.78590 43.9
10 16.49550 0.41550
11 11.41710 1.41500 1.94595 18.0
12 54.34020 可変
13 6.03730 3.32960 1.49700 81.6
14 -48.63350 0.93260
15* 12.17690 3.24180 1.80470 41.0
16 -40.55760 0.01000 1.56732 42.8
17 -40.55760 0.40000 1.84666 23.8
18 7.33790 0.30000
19(絞り) ∞ 可変
20* 10.70960 1.79450 1.52500 70.3
21* 682.87650 可変
22 ∞ 0.78000 1.51680 64.2
23 ∞ (BF)
像面 ∞
第15面
K= 0.00000E+00, A4=-7.18404E-04, A6=-2.38605E-05, A8=-8.22730E-07
A10= 0.00000E+00
第20面
K= 0.00000E+00, A4=-1.44429E-04, A6= 3.93254E-06, A8= 3.07661E-07
A10=-1.38658E-08
第21面
K= 0.00000E+00, A4=-1.01717E-04, A6= 2.13630E-06, A8= 4.46802E-07
A10=-1.80129E-08
ズーム比 13.97837
広角 中間 望遠
焦点距離 4.6500 17.4002 64.9995
Fナンバー 3.58003 5.47052 6.27507
画角 40.7265 12.6564 3.3680
像高 3.5000 3.9020 3.9020
レンズ全長 51.3024 58.0531 68.9684
BF 0.90480 0.89076 0.84139
d6 0.3050 13.1596 25.0706
d12 19.0154 5.8493 1.3032
d19 5.3359 5.8777 14.8307
d21 3.0445 9.5789 4.2257
入射瞳位置 12.8525 47.1928 195.5208
射出瞳位置 -11.9076 -19.4587 -57.9755
前側主点位置 15.8148 49.7147 188.6883
後側主点位置 46.6524 40.6529 3.9688
単レンズデータ
レンズ 始面 焦点距離
1 1 -82.7025
2 3 55.4103
3 5 50.4274
4 7 -7.1360
5 9 -13.3223
6 11 15.0389
7 13 11.0291
8 15 11.9660
9 17 -7.3110
10 20 20.7050
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 39.45012 6.57000 1.49757 3.93043
2 7 -6.77455 5.33830 0.19148 1.10718
3 13 11.56553 8.21400 -3.65554 1.57167
4 20 20.70503 1.79450 -0.01873 0.60013
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 7 -0.22934 -0.40603 -1.41907
3 13 -0.70721 -2.63780 -1.72585
4 20 0.72674 0.41182 0.67275
G2 第2レンズ群
G3 第3レンズ群
G4 第4レンズ群
G5 第5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
L10 第10レンズ素子
L11 第11レンズ素子
L12 第12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 (12)
- 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、
パワーを有する第4レンズ群と、
前記第3レンズ群と前記第4レンズ群との間に配置した開口絞りとを備え、
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、前記第2レンズ群及び前記第3レンズ群を光軸に沿って移動させて変倍を行い、
前記第3レンズ群が、2枚以上のレンズ素子と、1つ以上のレンズ素子間空気間隔とを有し、
以下の条件(1)及び(a)を満足することを特徴とする、ズームレンズ系:
-7.0<f1/f2<-4.0 ・・・(1)
fT/fW>9.0 ・・・(a)
ここで、
f1:第1レンズ群の合成焦点距離、
f2:第2レンズ群の合成焦点距離、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離
である。 - 撮像時の広角端から望遠端へのズーミングの際に、開口絞りが、第3レンズ群と一体的に光軸に沿って移動する、請求項1に記載のズームレンズ系。
- 以下の条件(2)を満足する、請求項1に記載のズームレンズ系:
0.5<|f1/f4|<4.2 ・・・(2)
ここで、
f1:第1レンズ群の合成焦点距離、
f4:第4レンズ群の合成焦点距離
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:
0.8<LT/fT<1.4 ・・・(3)
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:望遠端における全系の焦点距離
である。 - 第4レンズ群が、負のパワーを有する、請求項1に記載のズームレンズ系。
- 第4レンズ群が、1枚のレンズ素子からなる、請求項1に記載のズームレンズ系。
- 第4レンズ群の像側に、パワーを有する第5レンズ群を備える、請求項1に記載のズームレンズ系。
- 第5レンズ群が、正のパワーを有する、請求項7に記載のズームレンズ系。
- 第5レンズ群が、1枚のレンズ素子からなる、請求項7に記載のズームレンズ系。
- 無限遠合焦状態から近接物体合焦状態へのフォーカシングの際に、第4レンズ群又は第5レンズ群が光軸に沿って移動する、請求項7に記載のズームレンズ系。
- 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。
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JP2012554653A JPWO2012101959A1 (ja) | 2011-01-24 | 2012-01-06 | ズームレンズ系、撮像装置及びカメラ |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120327272A1 (en) * | 2011-01-24 | 2012-12-27 | Panasonic Corporation | Zoom Lens System, Imaging Device and Camera |
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EP2708933A1 (en) * | 2012-09-14 | 2014-03-19 | Samsung Electronics Co., Ltd | Zoom lens and photographing apparatus having the same |
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JP2016161887A (ja) * | 2015-03-05 | 2016-09-05 | 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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WO2014065264A1 (ja) | 2012-10-23 | 2014-05-01 | 株式会社ニコン | 変倍光学系、光学装置、変倍光学系の製造方法 |
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JP6136588B2 (ja) * | 2013-05-31 | 2017-05-31 | ソニー株式会社 | ズームレンズ及び撮像装置 |
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US20120327272A1 (en) * | 2011-01-24 | 2012-12-27 | Panasonic Corporation | Zoom Lens System, Imaging Device and Camera |
US8542446B2 (en) * | 2011-01-24 | 2013-09-24 | Panasonic Corporation | Zoom lens system, imaging device and camera |
JP2014035418A (ja) * | 2012-08-08 | 2014-02-24 | Canon Inc | ズ−ムレンズ及びそれを有する撮像装置 |
EP2708933A1 (en) * | 2012-09-14 | 2014-03-19 | Samsung Electronics Co., Ltd | Zoom lens and photographing apparatus having the same |
KR20140035691A (ko) * | 2012-09-14 | 2014-03-24 | 삼성전자주식회사 | 줌 렌즈 및 이를 포함한 촬영 장치 |
CN103676117A (zh) * | 2012-09-14 | 2014-03-26 | 三星电子株式会社 | 变焦镜头以及具有该变焦镜头的摄影装置 |
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CN104620153A (zh) * | 2012-09-14 | 2015-05-13 | 富士胶片株式会社 | 变焦镜头以及摄像装置 |
CN103676117B (zh) * | 2012-09-14 | 2017-07-21 | 三星电子株式会社 | 变焦镜头以及具有该变焦镜头的摄影装置 |
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JP2016161887A (ja) * | 2015-03-05 | 2016-09-05 | 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 |
US11099366B2 (en) | 2015-12-09 | 2021-08-24 | Nikon Corporation | Zoom lens, optical apparatus and method for manufacturing the zoom lens |
Also Published As
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CN102782555A (zh) | 2012-11-14 |
US8542446B2 (en) | 2013-09-24 |
US20120327272A1 (en) | 2012-12-27 |
JPWO2012101959A1 (ja) | 2014-06-30 |
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