WO2013027363A1 - Zoom-lens system, interchangeable lens device, and camera system - Google Patents

Zoom-lens system, interchangeable lens device, and camera system Download PDF

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Publication number
WO2013027363A1
WO2013027363A1 PCT/JP2012/005099 JP2012005099W WO2013027363A1 WO 2013027363 A1 WO2013027363 A1 WO 2013027363A1 JP 2012005099 W JP2012005099 W JP 2012005099W WO 2013027363 A1 WO2013027363 A1 WO 2013027363A1
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WIPO (PCT)
Prior art keywords
lens
lens group
zoom
object side
image
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PCT/JP2012/005099
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French (fr)
Japanese (ja)
Inventor
勇 泉原
恭一 宮崎
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パナソニック株式会社
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Publication of WO2013027363A1 publication Critical patent/WO2013027363A1/en

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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
    • G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
    • G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive

Definitions

  • the present disclosure relates to a zoom lens system, an interchangeable lens device, and a camera system.
  • the interchangeable-lens digital camera system (hereinafter also simply referred to as “camera system”) can shoot high-quality images with high sensitivity, and has high-speed focusing and post-shooting image processing. There is an advantage that the interchangeable lens device can be easily replaced, and it has been rapidly spread in recent years.
  • an interchangeable lens device including a zoom lens system that forms an optical image so as to be variable in magnification is popular in that the focal length can be freely changed without exchanging lenses.
  • zoom lens systems having high optical performance from the wide-angle end to the telephoto end have been proposed as zoom lens systems used for interchangeable lens devices.
  • Patent Document 1 describes a 1-1 lens group including a negative power lens group and a reflective optical element, a 1-2 lens group including one positive power lens, and a positive power second lens group. A zoom optical system including the same is disclosed.
  • Patent Document 2 discloses a variable power optical system including a first lens group including only one negative lens, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens group having a negative power. Is disclosed.
  • Patent Document 3 discloses a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, a fourth lens group having a positive power, and a fifth lens group having a negative power. There is disclosed a zoom optical system having a sixth lens group having a positive power and movable in the second, fourth and fifth lens groups during zooming.
  • the present disclosure provides a zoom lens system that is not only excellent in optical performance, but also has a relatively high zoom ratio, a short overall lens length, and is small and lightweight.
  • the present disclosure also provides an interchangeable lens apparatus and a camera system including the zoom lens system.
  • the zoom lens system in the present disclosure is: Having a plurality of lens groups composed of at least one lens element;
  • the lens group arranged on the most object side and the lens group arranged on the most image side are fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and all the lens groups
  • At least three lens groups are movable lens groups that move along the optical axis during zooming,
  • MN ⁇ 3 (1) 0.1 ⁇ T 1 / f W ⁇ 1.5 (2)
  • M total number of lens elements constituting all moving lens groups
  • N total number of moving lens groups
  • T 1 a distance on the optical axis from the most object side lens surface to the most image side lens surface of the lens unit disposed on the most object side
  • f W The focal length of the entire system d-line (wavelength: 587.56 nm) at the wide-angle end) Satisfied.
  • the interchangeable lens device in the present disclosure is: Having a plurality of lens groups composed of at least one lens element;
  • the lens group arranged on the most object side and the lens group arranged on the most image side are fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and all the lens groups
  • At least three lens groups are movable lens groups that move along the optical axis during the zooming,
  • Zoom lens system that satisfies
  • a lens mount unit that can be connected to a camera body including
  • the camera system in the present disclosure is: Having a plurality of lens groups composed of at least one lens element;
  • the lens group arranged on the most object side and the lens group arranged on the most image side are fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and all the lens groups
  • At least three lens groups are movable lens groups that move along the optical axis during zooming,
  • An interchangeable lens apparatus including a zoom lens system satisfying
  • a camera body including an image sensor that receives the optical image formed by
  • the zoom lens system according to the present disclosure not only has excellent optical performance, but also has a relatively high zoom ratio, a short overall lens length, is small and lightweight, and is suitable for a lens barrel whose movable lens group is independently driven by an actuator. is there.
  • FIG. 1 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 1 (Numerical Example 1).
  • FIG. 2 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 1 when the zoom lens system is in focus at infinity.
  • FIG. 3 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 2 (Numerical Example 2).
  • FIG. 4 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 2 when the zoom lens system is in focus at infinity.
  • FIG. 5 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 3 (Numerical Example 3).
  • FIG. 6 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 3 when the zoom lens system is in focus at infinity.
  • FIG. 7 is a schematic configuration diagram of an interchangeable lens digital camera system according to the fourth embodiment.
  • Embodiments 1 to 3) 1, 3 and 5 are lens arrangement diagrams of the zoom lens systems according to Embodiments 1 to 3, respectively, and all represent the zoom lens system in an infinitely focused state.
  • the lens configuration of T )) and (c) show 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.
  • FIGS. 1, 3 and 5 show directions in which a later-described fourth lens group G4 and fifth lens group G5 move during focusing from the infinite focus state to the close object focus state.
  • the first lens group G1 having a positive power
  • the second lens group G2 having a negative power
  • the positive power in order from the object side to the image side.
  • a third lens group G3 having a negative power
  • a fifth lens group G5 having a negative power
  • a sixth lens group G6 having a positive power.
  • the zoom lens system during zooming, 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 distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. Also, the second lens group G2, the fourth lens group G4, and the fifth lens group G5 move in the direction along the optical axis so as to 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.
  • an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8 in the third lens group G3.
  • the first lens group G1 includes, in order from the object side to the image side, a plano-convex first lens element L1 having a convex surface facing the object side, and a negative meniscus having a convex surface facing the object side. It comprises a second lens element L2 having a shape and a third lens element L3 having a positive meniscus shape with a convex surface facing the object side. Among these, the second lens element L2 and the third lens element L3 are cemented.
  • 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 positive meniscus fifth lens element L5 with a convex surface facing the object side. And a biconcave sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented.
  • the third lens group G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the object side, and a convex surface facing the object side. It comprises a positive meniscus ninth lens element L9 directed, a biconvex tenth lens element L10, and a negative meniscus eleventh lens element L11 with a convex surface facing the image side.
  • the eighth lens element L8 and the ninth lens element L9 are cemented, and the tenth lens element L10 and the eleventh lens element L11 are cemented.
  • the seventh lens element L7 has two aspheric surfaces, and the tenth lens element L10 has an aspheric object side surface. Further, an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8.
  • the fourth lens group G4 comprises solely a negative meniscus twelfth lens element L12 with the convex surface facing the object side.
  • the fifth lens group G5 comprises solely a negative meniscus thirteenth lens element L13 with the convex surface facing the image side.
  • the sixth lens group G6 comprises solely a positive meniscus fourteenth lens element L14 with the convex surface facing the image side.
  • the zoom lens system according to Embodiment 1 during zooming from the wide-angle end to the telephoto end during imaging, the second lens group G2 monotonously moves toward the image side, and the fourth lens group G4 moves toward the image side.
  • the fifth lens group G5 monotonously moves toward the object side, and the first lens group G1, the third lens group G3, and the sixth lens group G6 move relative to the image plane S. It is fixed. 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 moving lens group so that the distance between the group G4 changes, the distance between the fourth lens group G4 and the fifth lens group G5 changes, and the distance between the fifth lens group G5 and the sixth lens group G6 increases.
  • the second lens group G2, the fourth lens group G4, and the fifth lens group G5 are respectively moved along the optical axis.
  • the fourth lens group G4 and the fifth lens group G5 among the moving lens groups are moved to the optical axis during focusing from the infinite focus state to the close object focus state.
  • the fourth lens group G4 and the fifth lens group G5 move along the optical axis toward the image side during focusing.
  • the first lens group G1 includes, in order from the object side to the image side, a biconvex first lens element L1 and a negative meniscus second lens element L2 with a convex surface facing the object side. And a positive meniscus third lens element L3 having a convex surface facing the object side.
  • the second lens element L2 and the third lens element L3 are cemented.
  • 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 positive meniscus fifth lens element L5 with a convex surface facing the object side. And a biconcave sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented.
  • the third lens group G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the object side, and a convex surface facing the object side. It comprises a positive meniscus ninth lens element L9 directed, a biconvex tenth lens element L10, and a negative meniscus eleventh lens element L11 with a convex surface facing the image side.
  • the eighth lens element L8 and the ninth lens element L9 are cemented, and the tenth lens element L10 and the eleventh lens element L11 are cemented.
  • the seventh lens element L7 has two aspheric surfaces, and the tenth lens element L10 has an aspheric object side surface. Further, an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8.
  • the fourth lens group G4 comprises solely a negative meniscus twelfth lens element L12 with the convex surface facing the object side.
  • the fifth lens group G5 comprises solely a bi-concave thirteenth lens element L13.
  • the sixth lens group G6 comprises solely a biconvex fourteenth lens element L14.
  • the zoom lens system according to Embodiment 2 during zooming from the wide-angle end to the telephoto end during imaging, the second lens group G2 monotonously moves toward the image side, and the fourth lens group G4 moves toward the image side.
  • the fifth lens group G5 moves to the object side substantially monotonously, and the first lens group G1, the third lens group G3, and the sixth lens group G6 move relative to the image plane S. Is fixed. 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 moving lens group so that the distance between the group G4 changes, the distance between the fourth lens group G4 and the fifth lens group G5 changes, and the distance between the fifth lens group G5 and the sixth lens group G6 increases.
  • the second lens group G2, the fourth lens group G4, and the fifth lens group G5 are respectively moved along the optical axis.
  • the fourth lens group G4 and the fifth lens group G5 among the moving lens groups are moved along the optical axis during focusing from the infinite focus state to the close object focus state.
  • the fourth lens group G4 and the fifth lens group G5 move along the optical axis toward the image side during focusing.
  • the first lens group G1 includes, in order from the object side to the image side, a biconvex first lens element L1, and a negative meniscus second lens element L2 with a convex surface facing the object side. And a positive meniscus third lens element L3 having a convex surface facing the object side.
  • the second lens element L2 and the third lens element L3 are cemented.
  • 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 positive meniscus fifth lens element L5 with a convex surface facing the object side. And a biconcave sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented.
  • the third lens group G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the object side, and a convex surface facing the object side. It comprises a positive meniscus ninth lens element L9 directed, a biconvex tenth lens element L10, and a negative meniscus eleventh lens element L11 with a convex surface facing the image side.
  • the eighth lens element L8 and the ninth lens element L9 are cemented, and the tenth lens element L10 and the eleventh lens element L11 are cemented.
  • the seventh lens element L7 has two aspheric surfaces, and the tenth lens element L10 has an aspheric object side surface. Further, an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8.
  • the fourth lens group G4 comprises solely a negative meniscus twelfth lens element L12 with the convex surface facing the object side.
  • the fifth lens group G5 comprises solely a bi-concave thirteenth lens element L13.
  • the sixth lens group G6 comprises solely a biconvex fourteenth lens element L14.
  • the zoom lens system according to Embodiment 3 during zooming from the wide-angle end to the telephoto end during imaging, the second lens group G2 monotonously moves toward the image side, and the fourth lens group G4 moves toward the image side.
  • the fifth lens group G5 moves to the object side substantially monotonously, and the first lens group G1, the third lens group G3, and the sixth lens group G6 move relative to the image plane S. Is fixed. 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 moving lens group so that the distance between the group G4 changes, the distance between the fourth lens group G4 and the fifth lens group G5 changes, and the distance between the fifth lens group G5 and the sixth lens group G6 increases.
  • the second lens group G2, the fourth lens group G4, and the fifth lens group G5 are respectively moved along the optical axis.
  • the fourth lens group G4 and the fifth lens group G5 among the moving lens groups are moved along the optical axis during focusing from the infinite focus state to the close object focus state.
  • the fourth lens group G4 and the fifth lens group G5 move along the optical axis toward the image side during focusing.
  • the first lens group G1 disposed on the most object side and the sixth lens group G6 disposed on the most image side are arranged from the wide-angle end to the telephoto end during imaging.
  • the zoom lens is fixed with respect to the image plane S during zooming, and at least three of the second lens group G2, the fourth lens group G4, and the fifth lens group G5 out of all the lens groups are light beams during the zooming. It is a moving lens group which moves along an axis.
  • At least two fourth lens group G4 and fifth lens group G5 out of all moving lens groups are focused from the infinitely focused state to the close object focused state. It is a focusing lens group that moves along the optical axis at the time. Since each of the fourth lens group G4 and the fifth lens group G5 is composed of a single lens element, it is lightweight and sufficiently capable of high-speed autofocus.
  • Embodiments 1 to 3 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
  • a zoom lens system such as the zoom lens system according to Embodiments 1 to 3 is beneficial
  • a plurality of useful conditions are defined for the zoom lens system according to each embodiment, but the configuration of the zoom lens system that satisfies all of the plurality of conditions is most useful. However, by satisfying individual conditions, it is possible to obtain a zoom lens system that exhibits the corresponding effects.
  • the lens group includes a plurality of lens groups each including at least one lens element, and is disposed on the most object side and on the most image side.
  • the lens group is fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and at least three lens groups out of all the lens groups are positioned on the optical axis during the zooming.
  • the zoom lens system that is a moving lens group that moves along (hereinafter, this lens configuration is referred to as a basic configuration of the embodiment) satisfies the following conditions (1) and (2).
  • the condition (1) is a condition that defines the relationship between the total number of lens elements constituting the entire moving lens group and the total number of moving lens groups. If the condition (1) is not satisfied, it is difficult to reduce the weight of the moving lens group, so that high-speed and quiet driving cannot be performed, and low-power driving cannot be performed.
  • the condition (2) is a condition that defines the thickness of the lens group disposed on the most object side, that is, the first lens group. If the lower limit of the condition (2) is not reached, the number of lens elements constituting the first lens group cannot be increased, making it difficult to correct axial chromatic aberration and lateral chromatic aberration. Conversely, if the upper limit of condition (2) is exceeded, the thickness of the first lens group on the optical axis increases, and a compact and lightweight zoom lens system cannot be realized.
  • the above effect can be further achieved by satisfying at least one of the following conditions (2-1) ′ and (2-1) ′′. 0.15 ⁇ T 1 / f W (2-1) ′ T 1 / f W ⁇ 1.00 (2-1) ′′
  • Each lens group constituting the zoom lens system according to Embodiments 1 to 3 includes 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)
  • a diffractive lens element that deflects incident light by diffraction a refractive / diffractive hybrid lens element that deflects incident light by a combination of diffraction and refraction, and a refractive index that deflects incident light by the refractive index distribution in the medium
  • Each lens group may be composed of a distributed lens element or the like.
  • a diffractive / diffractive hybrid lens element forming a diffractive structure at the interface of media having different refractive indexes is advantageous because the wavelength dependency of diffraction efficiency is improved.
  • FIG. 7 is a schematic configuration diagram of an interchangeable lens digital camera system according to the fourth embodiment.
  • the interchangeable lens digital camera system 100 includes a camera body 101 and an interchangeable lens apparatus 201 that is detachably connected to the camera body 101.
  • the camera body 101 receives an optical image formed by the zoom lens system 202 of the interchangeable lens apparatus 201 and converts it into an electrical image signal, and displays the image signal converted by the image sensor 102.
  • a liquid crystal monitor 103 and a camera mount unit 104 are included.
  • the interchangeable lens device 201 includes a zoom lens system 202 according to any of Embodiments 1 to 3, a lens barrel 203 that holds the zoom lens system 202, and a lens mount unit connected to the camera mount unit 104 of the camera body. 204.
  • the camera mount unit 104 and the lens mount unit 204 electrically connect not only a physical connection but also a controller (not shown) in the camera body 101 and a controller (not shown) in the interchangeable lens device 201. It also functions as an interface that enables mutual signal exchange.
  • FIG. 7 illustrates a case where the zoom lens system according to Embodiment 1 is used as the zoom lens system 202.
  • Embodiment 4 since the zoom lens system 202 according to any of Embodiments 1 to 3 is used, an interchangeable lens apparatus that is compact and excellent in imaging performance can be realized at low cost. Further, it is possible to reduce the size and cost of the entire camera system 100 according to the fourth embodiment. Note that the zoom lens systems according to Embodiments 1 to 3 do not have to use the entire zooming area. 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 following corresponding numerical examples 1 to 3. Good.
  • the fourth embodiment has been described as an example of the technique disclosed in the present application.
  • the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
  • 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
  • ⁇ d 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.
  • Z distance from a point on the aspheric surface having a height h from the optical axis to the tangent plane of the aspheric vertex
  • h height from the optical axis
  • r vertex radius of curvature
  • ⁇ conic constant
  • An n-order aspherical coefficient.
  • 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.
  • SA spherical aberration
  • AST mm
  • DIS distortion
  • 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)
  • the long broken line is the C line (C- line).
  • the vertical axis represents the image height (indicated by H in the figure), the solid line represents the sagittal plane (indicated by s), and 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. 1 shows surface data of the zoom lens system of Numerical Example 1
  • Table 2 shows aspherical data
  • Table 3 shows various data in the infinite focus state
  • Table 4 shows zoom lens group data.
  • Table 8 (Zoom lens group data) Group Start surface Focal length 1 1 64.20355 2 6 -18.66879 3 11 21.49452 4 20 -33.51074 5 22 -26.27977 6 24 31.81621
  • Table 12 (Zoom lens group data) Group Start surface Focal length 1 1 65.48877 2 6 -18.35962 3 11 21.32502 4 20 -34.15493 5 22 -27.23969 6 24 32.86762
  • Table 13 shows the corresponding values for each condition in the zoom lens system of each numerical example.
  • the present disclosure is applicable to, for example, a digital still camera, a digital video camera, a camera of a portable information terminal such as a smartphone, a PDA (Personal Digital Assistance) camera, a surveillance camera in a surveillance system, a Web camera, an in-vehicle camera, and the like.
  • the present disclosure is suitable for a photographing optical system that requires high image quality, such as a digital still camera system and a digital video camera system.
  • the zoom lens system according to the present disclosure can be applied to an interchangeable lens device equipped with an electric zoom function for driving the zoom lens system with a motor, which is included in the digital video camera system, among the interchangeable lens devices according to the present disclosure. is there.
  • Aperture stop S Image surface 100 Lens interchangeable digital camera system 101 Camera body 102 Image sensor 103 Liquid crystal monitor 104 Camera mount unit 201 Interchangeable lens device 202 Zoom lens system 203 Lens barrel 204 Lens mount unit

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Abstract

A zoom-lens system wherein a lens group disposed furthest towards the object side and a lens group disposed furthest towards the image side remain fixed with respect to the image plane when zooming and at least three of the lens groups are moving lens groups that move along the optical axis when zooming. This zoom-lens system satisfies the relations M−N ≤ 3 and 0.1 ≤ T1/fW ≤ 1.5, where M represents the total number of lens elements in the moving lens groups, N represents the number of moving lens groups, T1 represents the distance along the optical axis from the lens surface furthest towards the object side in the lens group disposed furthest towards the object side to the lens surface furthest towards the image side in said lens group, and fW represents the d-line focal length of the entire system at the wide-angle end.

Description

ズームレンズ系、交換レンズ装置及びカメラシステムZoom lens system, interchangeable lens device and camera system
　本開示は、ズームレンズ系、交換レンズ装置及びカメラシステムに関する。 The present disclosure relates to a zoom lens system, an interchangeable lens device, and a camera system.
　レンズ交換式デジタルカメラシステム（以下、単に「カメラシステム」ともいう）は、高感度で高画質な画像を撮影することができ、フォーカシングや撮影後の画像処理が高速で、撮りたい場面に合わせて手軽に交換レンズ装置を取り替えることができる等の利点があり、近年急速に普及している。また光学像を変倍可能に形成するズームレンズ系を備えた交換レンズ装置は、レンズ交換をすることなく焦点距離を自在に変化させることができる点で人気がある。 The interchangeable-lens digital camera system (hereinafter also simply referred to as “camera system”) can shoot high-quality images with high sensitivity, and has high-speed focusing and post-shooting image processing. There is an advantage that the interchangeable lens device can be easily replaced, and it has been rapidly spread in recent years. In addition, an interchangeable lens device including a zoom lens system that forms an optical image so as to be variable in magnification is popular in that the focal length can be freely changed without exchanging lenses.
　交換レンズ装置に用いるズームレンズ系として、広角端から望遠端まで高い光学性能を有する種々のズームレンズ系が提案されている。 Various zoom lens systems having high optical performance from the wide-angle end to the telephoto end have been proposed as zoom lens systems used for interchangeable lens devices.
　特許文献１は、負パワーのレンズ群と反射光学素子とで構成された第１－１レンズ群、正パワーのレンズを１枚含む第１－２レンズ群、及び正パワーの第２レンズ群を含むズーム光学系を開示している。 Patent Document 1 describes a 1-1 lens group including a negative power lens group and a reflective optical element, a 1-2 lens group including one positive power lens, and a positive power second lens group. A zoom optical system including the same is disclosed.
　特許文献２は、負レンズ１枚のみを含む第１レンズ群と、負パワーの第２レンズ群と、正パワーの第３レンズ群と、負パワーの第４レンズ群とを含む変倍光学系を開示している。 Patent Document 2 discloses a variable power optical system including a first lens group including only one negative lens, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens group having a negative power. Is disclosed.
　特許文献３は、正パワーの第１レンズ群と、負パワーの第２レンズ群と、正パワーの第３レンズ群と、正パワーの第４レンズ群と、負パワーの第５レンズ群と、正パワーの第６レンズ群とを有し、ズーミング時に第２、第４及び第５レンズ群が可動のズーム光学系を開示している。 Patent Document 3 discloses a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, a fourth lens group having a positive power, and a fifth lens group having a negative power. There is disclosed a zoom optical system having a sixth lens group having a positive power and movable in the second, fourth and fifth lens groups during zooming.
特開２０１１－００８２７４号公報JP 2011-008274 A 特開２０１１－００２８１７号公報JP 2011-002817 A 特開２０１０－１７００８４号公報JP 2010-170084 A
　本開示は、光学性能に優れるのは勿論のこと、比較的ズーム比が高く、レンズ全長が短く小型で軽量なズームレンズ系を提供する。また本開示は、該ズームレンズ系を含む交換レンズ装置及びカメラシステムを提供する。 The present disclosure provides a zoom lens system that is not only excellent in optical performance, but also has a relatively high zoom ratio, a short overall lens length, and is small and lightweight. The present disclosure also provides an interchangeable lens apparatus and a camera system including the zoom lens system.
　本開示におけるズームレンズ系は、
少なくとも１枚のレンズ素子で構成されたレンズ群を複数有し、
最物体側に配置されたレンズ群及び最像側に配置されたレンズ群が、撮像時の広角端から望遠端へのズーミングの際に像面に対して固定されており、かつ、全レンズ群のうち少なくとも３つのレンズ群が、該ズーミングの際に光軸に沿って移動する移動レンズ群であり、
以下の条件（１）及び（２）：
　　Ｍ－Ｎ≦３　・・・（１）
　　０．１≦Ｔ１／ｆＷ≦１．５　・・・（２）
（ここで、
　Ｍ：全移動レンズ群を構成するレンズ素子の総数、
　Ｎ：移動レンズ群の総数、
　Ｔ１：最物体側に配置されたレンズ群の最物体側レンズ面から最像側レンズ面までの光軸上の距離、
　ｆＷ：広角端における全系のｄ線（波長：５８７．５６ｎｍ）での焦点距離
である）
を満足する。 The zoom lens system in the present disclosure is:
Having a plurality of lens groups composed of at least one lens element;
The lens group arranged on the most object side and the lens group arranged on the most image side are fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and all the lens groups At least three lens groups are movable lens groups that move along the optical axis during zooming,
The following conditions (1) and (2):
MN ≦ 3 (1)
0.1 ≦ T 1 / f W ≦ 1.5 (2)
(here,
M: total number of lens elements constituting all moving lens groups,
N: total number of moving lens groups,
T 1 : a distance on the optical axis from the most object side lens surface to the most image side lens surface of the lens unit disposed on the most object side,
f W : The focal length of the entire system d-line (wavelength: 587.56 nm) at the wide-angle end)
Satisfied.
　本開示における交換レンズ装置は、
少なくとも１枚のレンズ素子で構成されたレンズ群を複数有し、
最物体側に配置されたレンズ群及び最像側に配置されたレンズ群が、撮像時の広角端から望遠端へのズーミングの際に像面に対して固定されており、かつ、全レンズ群のうち少なくとも３つのレンズ群が、該ズーミングの際に光軸に沿って移動する移動レンズ群であり、
以下の条件（１）及び（２）：
　　Ｍ－Ｎ≦３　・・・（１）
　　０．１≦Ｔ１／ｆＷ≦１．５　・・・（２）
（ここで、
　Ｍ：全移動レンズ群を構成するレンズ素子の総数、
　Ｎ：移動レンズ群の総数、
　Ｔ１：最物体側に配置されたレンズ群の最物体側レンズ面から最像側レンズ面までの光軸上の距離、
　ｆＷ：広角端における全系のｄ線での焦点距離
である）
を満足するズームレンズ系と、
前記ズームレンズ系が形成する光学像を受光して電気的な画像信号に変換する撮像素子を含むカメラ本体との接続が可能なレンズマウント部と
を備える。 The interchangeable lens device in the present disclosure is:
Having a plurality of lens groups composed of at least one lens element;
The lens group arranged on the most object side and the lens group arranged on the most image side are fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and all the lens groups At least three lens groups are movable lens groups that move along the optical axis during the zooming,
The following conditions (1) and (2):
MN ≦ 3 (1)
0.1 ≦ T 1 / f W ≦ 1.5 (2)
(here,
M: total number of lens elements constituting all moving lens groups,
N: total number of moving lens groups,
T 1 : a distance on the optical axis from the most object side lens surface to the most image side lens surface of the lens unit disposed on the most object side,
f W is the focal length of the entire system at the d-line at the wide-angle end)
Zoom lens system that satisfies
A lens mount unit that can be connected to a camera body including an image sensor that receives an optical image formed by the zoom lens system and converts the optical image into an electrical image signal.
　本開示におけるカメラシステムは、
少なくとも１枚のレンズ素子で構成されたレンズ群を複数有し、
最物体側に配置されたレンズ群及び最像側に配置されたレンズ群が、撮像時の広角端から望遠端へのズーミングの際に像面に対して固定されており、かつ、全レンズ群のうち少なくとも３つのレンズ群が、該ズーミングの際に光軸に沿って移動する移動レンズ群であり、
以下の条件（１）及び（２）：
　　Ｍ－Ｎ≦３　・・・（１）
　　０．１≦Ｔ１／ｆＷ≦１．５　・・・（２）
（ここで、
　Ｍ：全移動レンズ群を構成するレンズ素子の総数、
　Ｎ：移動レンズ群の総数、
　Ｔ１：最物体側に配置されたレンズ群の最物体側レンズ面から最像側レンズ面までの光軸上の距離、
　ｆＷ：広角端における全系のｄ線での焦点距離
である）
を満足するズームレンズ系、を含む交換レンズ装置と、
前記交換レンズ装置とカメラマウント部を介して着脱可能に接続され、前記ズームレンズ系が形成する光学像を受光して電気的な画像信号に変換する撮像素子を含むカメラ本体と
を備える。 The camera system in the present disclosure is:
Having a plurality of lens groups composed of at least one lens element;
The lens group arranged on the most object side and the lens group arranged on the most image side are fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and all the lens groups At least three lens groups are movable lens groups that move along the optical axis during zooming,
The following conditions (1) and (2):
MN ≦ 3 (1)
0.1 ≦ T 1 / f W ≦ 1.5 (2)
(here,
M: total number of lens elements constituting all moving lens groups,
N: total number of moving lens groups,
T 1 : a distance on the optical axis from the most object side lens surface to the most image side lens surface of the lens unit disposed on the most object side,
f W : the focal length of the entire system at the d-line at the wide angle end
An interchangeable lens apparatus including a zoom lens system satisfying
A camera body including an image sensor that receives the optical image formed by the zoom lens system and converts it into an electrical image signal.
　本開示におけるズームレンズ系は、光学性能に優れるのは勿論のこと、比較的ズーム比が高く、レンズ全長が短く小型で軽量であり、可動レンズ群がアクチュエータで独立駆動するレンズ鏡筒に好適である。 The zoom lens system according to the present disclosure not only has excellent optical performance, but also has a relatively high zoom ratio, a short overall lens length, is small and lightweight, and is suitable for a lens barrel whose movable lens group is independently driven by an actuator. is there.
図１は、実施の形態１（数値実施例１）に係るズームレンズ系の無限遠合焦状態を示すレンズ配置図である。FIG. 1 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 1 (Numerical Example 1). 図２は、数値実施例１に係るズームレンズ系の無限遠合焦状態の縦収差図である。FIG. 2 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 1 when the zoom lens system is in focus at infinity. 図３は、実施の形態２（数値実施例２）に係るズームレンズ系の無限遠合焦状態を示すレンズ配置図である。FIG. 3 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 2 (Numerical Example 2). 図４は、数値実施例２に係るズームレンズ系の無限遠合焦状態の縦収差図である。FIG. 4 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 2 when the zoom lens system is in focus at infinity. 図５は、実施の形態３（数値実施例３）に係るズームレンズ系の無限遠合焦状態を示すレンズ配置図である。FIG. 5 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 3 (Numerical Example 3). 図６は、数値実施例３に係るズームレンズ系の無限遠合焦状態の縦収差図である。FIG. 6 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 3 when the zoom lens system is in focus at infinity. 図７は、実施の形態４に係るレンズ交換式デジタルカメラシステムの概略構成図である。FIG. 7 is a schematic configuration diagram of an interchangeable lens digital camera system according to the fourth embodiment.
　以下、適宜図面を参照しながら、実施の形態を詳細に説明する。ただし、必要以上に詳細な説明は省略する場合がある。例えば、既によく知られた事項の詳細説明や実質的に同一の構成に対する重複説明を省略する場合がある。これは、以下の説明が不必要に冗長になるのを避け、当業者の理解を容易にするためである。 Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.
　なお、発明者らは、当業者が本開示を充分に理解するために添付図面および以下の説明を提供するのであって、これらによって請求の範囲に記載の主題を限定することを意図するものではない。 In addition, the inventors provide the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims. Absent.
（実施の形態１～３）
　図１、３及び５は、各々実施の形態１～３に係るズームレンズ系のレンズ配置図であり、いずれも無限遠合焦状態にあるズームレンズ系を表している。 (Embodiments 1 to 3)
1, 3 and 5 are lens arrangement diagrams of the zoom lens systems according to Embodiments 1 to 3, respectively, and all represent the zoom lens system in an infinitely focused state.
　各図において、（ａ）図は広角端（最短焦点距離状態：焦点距離ｆＷ）のレンズ構成、（ｂ）図は中間位置（中間焦点距離状態：焦点距離ｆＭ＝√（ｆＷ＊ｆＴ））のレンズ構成、（ｃ）図は望遠端（最長焦点距離状態：焦点距離ｆＴ）のレンズ構成をそれぞれ表している。また各図において、（ａ）図と（ｂ）図との間に設けられた折れ線の矢印は、上から順に、広角端、中間位置、望遠端の各状態におけるレンズ群の位置を結んで得られる直線である。広角端と中間位置との間、中間位置と望遠端との間は、単純に直線で接続されているだけであり、実際の各レンズ群の動きとは異なる。 In each figure, (a) shows a lens configuration at the wide angle end (shortest focal length state: focal length f W ), and (b) shows an intermediate position (intermediate focal length state: focal length f M = √ (f W * f). The lens configuration of T )) and (c) show the lens configuration at the telephoto end (longest focal length state: focal length f T ). Also, in each figure, 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.
　さらに各図において、レンズ群に付された矢印は、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を表す。すなわち、図１、３及び５では、後述する第４レンズ群Ｇ４及び第５レンズ群Ｇ５が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移動する方向を示している。 Further, in each figure, an arrow attached to the lens group represents focusing from an infinitely focused state to a close object focused state. That is, FIGS. 1, 3 and 5 show directions in which a later-described fourth lens group G4 and fifth lens group G5 move during focusing from the infinite focus state to the close object focus state.
　実施の形態１～３に係るズームレンズ系は、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Ｇ１と、負のパワーを有する第２レンズ群Ｇ２と、正のパワーを有する第３レンズ群Ｇ３と、負のパワーを有する第４レンズ群Ｇ４と、負のパワーを有する第５レンズ群Ｇ５と、正のパワーを有する第６レンズ群Ｇ６とを備える。各実施の形態に係るズームレンズ系では、ズーミングに際して、各レンズ群の間隔、すなわち、前記第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔、及び第５レンズ群Ｇ５と第６レンズ群Ｇ６との間隔がいずれも変化するように、第２レンズ群Ｇ２、第４レンズ群Ｇ４及び第５レンズ群Ｇ５が光軸に沿った方向にそれぞれ移動する。各実施の形態に係るズームレンズ系は、これら各レンズ群を所望のパワー配置にすることにより、高い光学性能を保持しつつ、レンズ系全体の小型化を可能にしている。 In the zoom lens systems according to Embodiments 1 to 3, the first lens group G1 having a positive power, the second lens group G2 having a negative power, and the positive power in order from the object side to the image side. A third lens group G3 having a negative power; a fifth lens group G5 having a negative power; and a sixth lens group G6 having a positive power. In the zoom lens system according to each embodiment, during zooming, 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 distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. Also, the second lens group G2, the fourth lens group G4, and the fifth lens group G5 move in the direction along the optical axis so as to 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.
　図１、３及び５において、特定の面に付されたアスタリスク＊は、該面が非球面であることを示している。また各図において、各レンズ群の符号に付された記号（＋）及び記号（－）は、各レンズ群のパワーの符号に対応する。また各図において、最も右側に記載された直線は、像面Ｓの位置を表す。 In FIGS. 1, 3 and 5, an asterisk * attached to a specific surface indicates that the surface is aspherical. In each figure, a symbol (+) and a symbol (−) attached to a symbol of each lens group correspond to a power symbol of each lens group. In each figure, the straight line described on the rightmost side represents the position of the image plane S.
　図１、３及び５に示すように、第３レンズ群Ｇ３内の第７レンズ素子Ｌ７と第８レンズ素子Ｌ８との間には、開口絞りＡが設けられている。 As shown in FIGS. 1, 3 and 5, an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8 in the third lens group G3.
（実施の形態１）
　図１に示すように、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平凸形状の第１レンズ素子Ｌ１と、物体側に凸面を向けた負メニスカス形状の第２レンズ素子Ｌ２と、物体側に凸面を向けた正メニスカス形状の第３レンズ素子Ｌ３とからなる。これらのうち、第２レンズ素子Ｌ２と第３レンズ素子Ｌ３とは接合されている。 (Embodiment 1)
As shown in FIG. 1, the first lens group G1 includes, in order from the object side to the image side, a plano-convex first lens element L1 having a convex surface facing the object side, and a negative meniscus having a convex surface facing the object side. It comprises a second lens element L2 having a shape and a third lens element L3 having a positive meniscus shape with a convex surface facing the object side. Among these, the second lens element L2 and the third lens element L3 are cemented.
　第２レンズ群Ｇ２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４レンズ素子Ｌ４と、物体側に凸面を向けた正メニスカス形状の第５レンズ素子Ｌ５と、両凹形状の第６レンズ素子Ｌ６とからなる。これらのうち、第４レンズ素子Ｌ４と第５レンズ素子Ｌ５とは接合されている。 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 positive meniscus fifth lens element L5 with a convex surface facing the object side. And a biconcave sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented.
　第３レンズ群Ｇ３は、物体側から像側へと順に、両凸形状の第７レンズ素子Ｌ７と、物体側に凸面を向けた負メニスカス形状の第８レンズ素子Ｌ８と、物体側に凸面を向けた正メニスカス形状の第９レンズ素子Ｌ９と、両凸形状の第１０レンズ素子Ｌ１０と、像側に凸面を向けた負メニスカス形状の第１１レンズ素子Ｌ１１とからなる。これらのうち、第８レンズ素子Ｌ８と第９レンズ素子Ｌ９とは接合されており、第１０レンズ素子Ｌ１０と第１１レンズ素子Ｌ１１とは接合されている。また、第７レンズ素子Ｌ７は、その両面が非球面であり、第１０レンズ素子Ｌ１０は、その物体側面が非球面である。さらに、第７レンズ素子Ｌ７と第８レンズ素子Ｌ８との間には、開口絞りＡが設けられている。 The third lens group G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the object side, and a convex surface facing the object side. It comprises a positive meniscus ninth lens element L9 directed, a biconvex tenth lens element L10, and a negative meniscus eleventh lens element L11 with a convex surface facing the image side. Among these, the eighth lens element L8 and the ninth lens element L9 are cemented, and the tenth lens element L10 and the eleventh lens element L11 are cemented. The seventh lens element L7 has two aspheric surfaces, and the tenth lens element L10 has an aspheric object side surface. Further, an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8.
　第４レンズ群Ｇ４は、物体側に凸面を向けた負メニスカス形状の第１２レンズ素子Ｌ１２のみからなる。 The fourth lens group G4 comprises solely a negative meniscus twelfth lens element L12 with the convex surface facing the object side.
　第５レンズ群Ｇ５は、像側に凸面を向けた負メニスカス形状の第１３レンズ素子Ｌ１３のみからなる。 The fifth lens group G5 comprises solely a negative meniscus thirteenth lens element L13 with the convex surface facing the image side.
　第６レンズ群Ｇ６は、像側に凸面を向けた正メニスカス形状の第１４レンズ素子Ｌ１４のみからなる。 The sixth lens group G6 comprises solely a positive meniscus fourteenth lens element L14 with the convex surface facing the image side.
　実施の形態１に係るズームレンズ系において、撮像時の広角端から望遠端へのズーミングの際に、第２レンズ群Ｇ２は、単調に像側へ移動し、第４レンズ群Ｇ４は、像側に凸の軌跡を描いて移動し、第５レンズ群Ｇ５は、単調に物体側へ移動し、第１レンズ群Ｇ１、第３レンズ群Ｇ３及び第６レンズ群Ｇ６は、像面Ｓに対して固定されている。すなわち、ズーミングに際して、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔が変化し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔が変化し、第５レンズ群Ｇ５と第６レンズ群Ｇ６との間隔が増大するように、移動レンズ群である第２レンズ群Ｇ２、第４レンズ群Ｇ４及び第５レンズ群Ｇ５が光軸に沿ってそれぞれ移動する。 In the zoom lens system according to Embodiment 1, during zooming from the wide-angle end to the telephoto end during imaging, the second lens group G2 monotonously moves toward the image side, and the fourth lens group G4 moves toward the image side. The fifth lens group G5 monotonously moves toward the object side, and the first lens group G1, the third lens group G3, and the sixth lens group G6 move relative to the image plane S. It is fixed. 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 moving lens group so that the distance between the group G4 changes, the distance between the fourth lens group G4 and the fifth lens group G5 changes, and the distance between the fifth lens group G5 and the sixth lens group G6 increases. The second lens group G2, the fourth lens group G4, and the fifth lens group G5 are respectively moved along the optical axis.
　さらに実施の形態１に係るズームレンズ系において、移動レンズ群のうち第４レンズ群Ｇ４及び第５レンズ群Ｇ５が、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光軸に沿って移動するフォーカシングレンズ群であり、これら第４レンズ群Ｇ４及び第５レンズ群Ｇ５はいずれも、フォーカシングの際に光軸に沿って像側へ移動する。 Furthermore, in the zoom lens system according to Embodiment 1, the fourth lens group G4 and the fifth lens group G5 among the moving lens groups are moved to the optical axis during focusing from the infinite focus state to the close object focus state. The fourth lens group G4 and the fifth lens group G5 move along the optical axis toward the image side during focusing.
（実施の形態２）
　図３に示すように、第１レンズ群Ｇ１は、物体側から像側へと順に、両凸形状の第１レンズ素子Ｌ１と、物体側に凸面を向けた負メニスカス形状の第２レンズ素子Ｌ２と、物体側に凸面を向けた正メニスカス形状の第３レンズ素子Ｌ３とからなる。これらのうち、第２レンズ素子Ｌ２と第３レンズ素子Ｌ３とは接合されている。 (Embodiment 2)
As shown in FIG. 3, the first lens group G1 includes, in order from the object side to the image side, a biconvex first lens element L1 and a negative meniscus second lens element L2 with a convex surface facing the object side. And a positive meniscus third lens element L3 having a convex surface facing the object side. Among these, the second lens element L2 and the third lens element L3 are cemented.
　第２レンズ群Ｇ２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４レンズ素子Ｌ４と、物体側に凸面を向けた正メニスカス形状の第５レンズ素子Ｌ５と、両凹形状の第６レンズ素子Ｌ６とからなる。これらのうち、第４レンズ素子Ｌ４と第５レンズ素子Ｌ５とは接合されている。 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 positive meniscus fifth lens element L5 with a convex surface facing the object side. And a biconcave sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented.
　第３レンズ群Ｇ３は、物体側から像側へと順に、両凸形状の第７レンズ素子Ｌ７と、物体側に凸面を向けた負メニスカス形状の第８レンズ素子Ｌ８と、物体側に凸面を向けた正メニスカス形状の第９レンズ素子Ｌ９と、両凸形状の第１０レンズ素子Ｌ１０と、像側に凸面を向けた負メニスカス形状の第１１レンズ素子Ｌ１１とからなる。これらのうち、第８レンズ素子Ｌ８と第９レンズ素子Ｌ９とは接合されており、第１０レンズ素子Ｌ１０と第１１レンズ素子Ｌ１１とは接合されている。また、第７レンズ素子Ｌ７は、その両面が非球面であり、第１０レンズ素子Ｌ１０は、その物体側面が非球面である。さらに、第７レンズ素子Ｌ７と第８レンズ素子Ｌ８との間には、開口絞りＡが設けられている。 The third lens group G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the object side, and a convex surface facing the object side. It comprises a positive meniscus ninth lens element L9 directed, a biconvex tenth lens element L10, and a negative meniscus eleventh lens element L11 with a convex surface facing the image side. Among these, the eighth lens element L8 and the ninth lens element L9 are cemented, and the tenth lens element L10 and the eleventh lens element L11 are cemented. The seventh lens element L7 has two aspheric surfaces, and the tenth lens element L10 has an aspheric object side surface. Further, an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8.
　第４レンズ群Ｇ４は、物体側に凸面を向けた負メニスカス形状の第１２レンズ素子Ｌ１２のみからなる。 The fourth lens group G4 comprises solely a negative meniscus twelfth lens element L12 with the convex surface facing the object side.
　第５レンズ群Ｇ５は、両凹形状の第１３レンズ素子Ｌ１３のみからなる。 The fifth lens group G5 comprises solely a bi-concave thirteenth lens element L13.
　第６レンズ群Ｇ６は、両凸形状の第１４レンズ素子Ｌ１４のみからなる。 The sixth lens group G6 comprises solely a biconvex fourteenth lens element L14.
　実施の形態２に係るズームレンズ系において、撮像時の広角端から望遠端へのズーミングの際に、第２レンズ群Ｇ２は、単調に像側へ移動し、第４レンズ群Ｇ４は、像側に凸の軌跡を描いて移動し、第５レンズ群Ｇ５は、略単調に物体側へ移動し、第１レンズ群Ｇ１、第３レンズ群Ｇ３及び第６レンズ群Ｇ６は、像面Ｓに対して固定されている。すなわち、ズーミングに際して、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔が変化し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔が変化し、第５レンズ群Ｇ５と第６レンズ群Ｇ６との間隔が増大するように、移動レンズ群である第２レンズ群Ｇ２、第４レンズ群Ｇ４及び第５レンズ群Ｇ５が光軸に沿ってそれぞれ移動する。 In the zoom lens system according to Embodiment 2, during zooming from the wide-angle end to the telephoto end during imaging, the second lens group G2 monotonously moves toward the image side, and the fourth lens group G4 moves toward the image side. The fifth lens group G5 moves to the object side substantially monotonously, and the first lens group G1, the third lens group G3, and the sixth lens group G6 move relative to the image plane S. Is fixed. 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 moving lens group so that the distance between the group G4 changes, the distance between the fourth lens group G4 and the fifth lens group G5 changes, and the distance between the fifth lens group G5 and the sixth lens group G6 increases. The second lens group G2, the fourth lens group G4, and the fifth lens group G5 are respectively moved along the optical axis.
　さらに実施の形態２に係るズームレンズ系において、移動レンズ群のうち第４レンズ群Ｇ４及び第５レンズ群Ｇ５が、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光軸に沿って移動するフォーカシングレンズ群であり、これら第４レンズ群Ｇ４及び第５レンズ群Ｇ５はいずれも、フォーカシングの際に光軸に沿って像側へ移動する。 Further, in the zoom lens system according to Embodiment 2, the fourth lens group G4 and the fifth lens group G5 among the moving lens groups are moved along the optical axis during focusing from the infinite focus state to the close object focus state. The fourth lens group G4 and the fifth lens group G5 move along the optical axis toward the image side during focusing.
（実施の形態３）
　図５に示すように、第１レンズ群Ｇ１は、物体側から像側へと順に、両凸形状の第１レンズ素子Ｌ１と、物体側に凸面を向けた負メニスカス形状の第２レンズ素子Ｌ２と、物体側に凸面を向けた正メニスカス形状の第３レンズ素子Ｌ３とからなる。これらのうち、第２レンズ素子Ｌ２と第３レンズ素子Ｌ３とは接合されている。 (Embodiment 3)
As shown in FIG. 5, the first lens group G1 includes, in order from the object side to the image side, a biconvex first lens element L1, and a negative meniscus second lens element L2 with a convex surface facing the object side. And a positive meniscus third lens element L3 having a convex surface facing the object side. Among these, the second lens element L2 and the third lens element L3 are cemented.
　第２レンズ群Ｇ２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４レンズ素子Ｌ４と、物体側に凸面を向けた正メニスカス形状の第５レンズ素子Ｌ５と、両凹形状の第６レンズ素子Ｌ６とからなる。これらのうち、第４レンズ素子Ｌ４と第５レンズ素子Ｌ５とは接合されている。 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 positive meniscus fifth lens element L5 with a convex surface facing the object side. And a biconcave sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented.
　第３レンズ群Ｇ３は、物体側から像側へと順に、両凸形状の第７レンズ素子Ｌ７と、物体側に凸面を向けた負メニスカス形状の第８レンズ素子Ｌ８と、物体側に凸面を向けた正メニスカス形状の第９レンズ素子Ｌ９と、両凸形状の第１０レンズ素子Ｌ１０と、像側に凸面を向けた負メニスカス形状の第１１レンズ素子Ｌ１１とからなる。これらのうち、第８レンズ素子Ｌ８と第９レンズ素子Ｌ９とは接合されており、第１０レンズ素子Ｌ１０と第１１レンズ素子Ｌ１１とは接合されている。また、第７レンズ素子Ｌ７は、その両面が非球面であり、第１０レンズ素子Ｌ１０は、その物体側面が非球面である。さらに、第７レンズ素子Ｌ７と第８レンズ素子Ｌ８との間には、開口絞りＡが設けられている。 The third lens group G3 includes, in order from the object side to the image side, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the object side, and a convex surface facing the object side. It comprises a positive meniscus ninth lens element L9 directed, a biconvex tenth lens element L10, and a negative meniscus eleventh lens element L11 with a convex surface facing the image side. Among these, the eighth lens element L8 and the ninth lens element L9 are cemented, and the tenth lens element L10 and the eleventh lens element L11 are cemented. The seventh lens element L7 has two aspheric surfaces, and the tenth lens element L10 has an aspheric object side surface. Further, an aperture stop A is provided between the seventh lens element L7 and the eighth lens element L8.
　第４レンズ群Ｇ４は、物体側に凸面を向けた負メニスカス形状の第１２レンズ素子Ｌ１２のみからなる。 The fourth lens group G4 comprises solely a negative meniscus twelfth lens element L12 with the convex surface facing the object side.
　第５レンズ群Ｇ５は、両凹形状の第１３レンズ素子Ｌ１３のみからなる。 The fifth lens group G5 comprises solely a bi-concave thirteenth lens element L13.
　第６レンズ群Ｇ６は、両凸形状の第１４レンズ素子Ｌ１４のみからなる。 The sixth lens group G6 comprises solely a biconvex fourteenth lens element L14.
　実施の形態３に係るズームレンズ系において、撮像時の広角端から望遠端へのズーミングの際に、第２レンズ群Ｇ２は、単調に像側へ移動し、第４レンズ群Ｇ４は、像側に凸の軌跡を描いて移動し、第５レンズ群Ｇ５は、略単調に物体側へ移動し、第１レンズ群Ｇ１、第３レンズ群Ｇ３及び第６レンズ群Ｇ６は、像面Ｓに対して固定されている。すなわち、ズーミングに際して、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔が変化し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔が変化し、第５レンズ群Ｇ５と第６レンズ群Ｇ６との間隔が増大するように、移動レンズ群である第２レンズ群Ｇ２、第４レンズ群Ｇ４及び第５レンズ群Ｇ５が光軸に沿ってそれぞれ移動する。 In the zoom lens system according to Embodiment 3, during zooming from the wide-angle end to the telephoto end during imaging, the second lens group G2 monotonously moves toward the image side, and the fourth lens group G4 moves toward the image side. The fifth lens group G5 moves to the object side substantially monotonously, and the first lens group G1, the third lens group G3, and the sixth lens group G6 move relative to the image plane S. Is fixed. 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 moving lens group so that the distance between the group G4 changes, the distance between the fourth lens group G4 and the fifth lens group G5 changes, and the distance between the fifth lens group G5 and the sixth lens group G6 increases. The second lens group G2, the fourth lens group G4, and the fifth lens group G5 are respectively moved along the optical axis.
　さらに実施の形態３に係るズームレンズ系において、移動レンズ群のうち第４レンズ群Ｇ４及び第５レンズ群Ｇ５が、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光軸に沿って移動するフォーカシングレンズ群であり、これら第４レンズ群Ｇ４及び第５レンズ群Ｇ５はいずれも、フォーカシングの際に光軸に沿って像側へ移動する。 Furthermore, in the zoom lens system according to Embodiment 3, the fourth lens group G4 and the fifth lens group G5 among the moving lens groups are moved along the optical axis during focusing from the infinite focus state to the close object focus state. The fourth lens group G4 and the fifth lens group G5 move along the optical axis toward the image side during focusing.
　実施の形態１～３に係るズームレンズ系では、最物体側に配置された第１レンズ群Ｇ１及び最像側に配置された第６レンズ群Ｇ６が、撮像時の広角端から望遠端へのズーミングの際に像面Ｓに対して固定されており、かつ、全レンズ群のうち少なくとも３つの第２レンズ群Ｇ２、第４レンズ群Ｇ４及び第５レンズ群Ｇ５が、該ズーミングの際に光軸に沿って移動する移動レンズ群である。 In the zoom lens systems according to Embodiments 1 to 3, the first lens group G1 disposed on the most object side and the sixth lens group G6 disposed on the most image side are arranged from the wide-angle end to the telephoto end during imaging. The zoom lens is fixed with respect to the image plane S during zooming, and at least three of the second lens group G2, the fourth lens group G4, and the fifth lens group G5 out of all the lens groups are light beams during the zooming. It is a moving lens group which moves along an axis.
　また実施の形態１～３に係るズームレンズ系では、全移動レンズ群のうち少なくとも２つの第４レンズ群Ｇ４及び第５レンズ群Ｇ５が、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光軸に沿って移動するフォーカシングレンズ群である。これら第４レンズ群Ｇ４及び第５レンズ群Ｇ５はいずれも、１枚のレンズ素子で構成されているので、軽量であり、高速オートフォーカスが充分に可能である。 In the zoom lens systems according to Embodiments 1 to 3, at least two fourth lens group G4 and fifth lens group G5 out of all moving lens groups are focused from the infinitely focused state to the close object focused state. It is a focusing lens group that moves along the optical axis at the time. Since each of the fourth lens group G4 and the fifth lens group G5 is composed of a single lens element, it is lightweight and sufficiently capable of high-speed autofocus.
　以上のように、本出願において開示する技術の例示として、実施の形態１～３を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。 As described above, Embodiments 1 to 3 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
　以下、例えば実施の形態１～３に係るズームレンズ系のごときズームレンズ系が満足することが有益な条件を説明する。なお、各実施の形態に係るズームレンズ系に対して、複数の有益な条件が規定されるが、これら複数の条件すべてを満足するズームレンズ系の構成が最も有益である。しかしながら、個別の条件を満足することにより、それぞれ対応する効果を奏するズームレンズ系を得ることも可能である。 Hereinafter, for example, conditions in which a zoom lens system such as the zoom lens system according to Embodiments 1 to 3 is beneficial will be described. A plurality of useful conditions are defined for the zoom lens system according to each embodiment, but the configuration of the zoom lens system that satisfies all of the plurality of conditions is most useful. However, by satisfying individual conditions, it is possible to obtain a zoom lens system that exhibits the corresponding effects.
　例えば実施の形態１～３に係るズームレンズ系のように、少なくとも１枚のレンズ素子で構成されたレンズ群を複数有し、最物体側に配置されたレンズ群及び最像側に配置されたレンズ群が、撮像時の広角端から望遠端へのズーミングの際に像面に対して固定されており、かつ、全レンズ群のうち少なくとも３つのレンズ群が、該ズーミングの際に光軸に沿って移動する移動レンズ群である（以下、このレンズ構成を、実施の形態の基本構成という）ズームレンズ系は、以下の条件（１）及び（２）を満足する。
　　Ｍ－Ｎ≦３　・・・（１）
　　０．１≦Ｔ１／ｆＷ≦１．５　・・・（２）
ここで、
　Ｍ：全移動レンズ群を構成するレンズ素子の総数、
　Ｎ：移動レンズ群の総数、
　Ｔ１：最物体側に配置されたレンズ群の最物体側レンズ面から最像側レンズ面までの光軸上の距離、
　ｆＷ：広角端における全系のｄ線での焦点距離
である。 For example, as in the zoom lens systems according to Embodiments 1 to 3, the lens group includes a plurality of lens groups each including at least one lens element, and is disposed on the most object side and on the most image side. The lens group is fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and at least three lens groups out of all the lens groups are positioned on the optical axis during the zooming. The zoom lens system that is a moving lens group that moves along (hereinafter, this lens configuration is referred to as a basic configuration of the embodiment) satisfies the following conditions (1) and (2).
MN ≦ 3 (1)
0.1 ≦ T 1 / f W ≦ 1.5 (2)
here,
M: total number of lens elements constituting all moving lens groups,
N: total number of moving lens groups,
T 1 : a distance on the optical axis from the most object side lens surface to the most image side lens surface of the lens unit disposed on the most object side,
f W : The focal length of the entire system at the d-line at the wide angle end.
　前記条件（１）は、全移動レンズ群を構成するレンズ素子の総数と移動レンズ群の総数との関係を規定する条件である。条件（１）を満足しない場合には、移動レンズ群の軽量化が困難となるため、高速で静かな駆動ができず、また低電力での駆動ができない。 The condition (1) is a condition that defines the relationship between the total number of lens elements constituting the entire moving lens group and the total number of moving lens groups. If the condition (1) is not satisfied, it is difficult to reduce the weight of the moving lens group, so that high-speed and quiet driving cannot be performed, and low-power driving cannot be performed.
　なお、以下の条件（１）’を満足することにより、前記効果をさらに奏功させることができる。
　　Ｍ－Ｎ≦２　・・・（１）’ In addition, the said effect can be made more successful by satisfying the following conditions (1) ′.
MN ≦ 2 (1) '
　前記条件（２）は、最物体側に配置されたレンズ群、すなわち第１レンズ群の厚みを規定する条件である。条件（２）の下限を下回ると、第１レンズ群を構成するレンズ素子の枚数を多くすることができないため、軸上色収差及び倍率色収差の補正が困難となる。逆に条件（２）の上限を上回ると、第１レンズ群の光軸上での厚みが増大し、小型で軽量なズームレンズ系を実現することができない。 The condition (2) is a condition that defines the thickness of the lens group disposed on the most object side, that is, the first lens group. If the lower limit of the condition (2) is not reached, the number of lens elements constituting the first lens group cannot be increased, making it difficult to correct axial chromatic aberration and lateral chromatic aberration. Conversely, if the upper limit of condition (2) is exceeded, the thickness of the first lens group on the optical axis increases, and a compact and lightweight zoom lens system cannot be realized.
　なお、以下の条件（２－１）’及び（２－１）’’の少なくとも１つを満足することにより、前記効果をさらに奏功させることができる。
　　０．１５≦Ｔ１／ｆＷ　・・・（２－１）’
　　Ｔ１／ｆＷ≦１．００　・・・（２－１）’’ The above effect can be further achieved by satisfying at least one of the following conditions (2-1) ′ and (2-1) ″.
0.15 ≦ T 1 / f W (2-1) ′
T 1 / f W ≦ 1.00 (2-1) ″
　さらに以下の条件（２－２）’及び（２－２）’’の少なくとも１つを満足することにより、前記効果をさらに奏功させることができる。
　　０．２≦Ｔ１／ｆＷ　・・・（２－２）’
　　Ｔ１／ｆＷ≦０．３　・・・（２－２）’’ Furthermore, when at least one of the following conditions (2-2) ′ and (2-2) ″ is satisfied, the above effect can be further achieved.
0.2 ≦ T 1 / f W (2-2) ′
T 1 / f W ≦ 0.3 (2-2) ″
　実施の形態１～３に係るズームレンズ系を構成している各レンズ群は、入射光線を屈折により偏向させる屈折型レンズ素子（すなわち、異なる屈折率を有する媒質同士の界面で偏向が行われるタイプのレンズ素子）のみで構成されているが、これに限定されるものではない。例えば、回折により入射光線を偏向させる回折型レンズ素子、回折作用と屈折作用との組み合わせで入射光線を偏向させる屈折・回折ハイブリッド型レンズ素子、入射光線を媒質内の屈折率分布により偏向させる屈折率分布型レンズ素子等で、各レンズ群を構成してもよい。特に、屈折・回折ハイブリッド型レンズ素子において、屈折率の異なる媒質の界面に回折構造を形成すると、回折効率の波長依存性が改善されるので、有益である。 Each lens group constituting the zoom lens system according to Embodiments 1 to 3 includes 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) However, the present invention is not limited to this. For example, a diffractive lens element that deflects incident light by diffraction, a refractive / diffractive hybrid lens element that deflects incident light by a combination of diffraction and refraction, and a refractive index that deflects incident light by the refractive index distribution in the medium Each lens group may be composed of a distributed lens element or the like. In particular, in a refractive / diffractive hybrid lens element, forming a diffractive structure at the interface of media having different refractive indexes is advantageous because the wavelength dependency of diffraction efficiency is improved.
（実施の形態４）
　図７は、実施の形態４に係るレンズ交換式デジタルカメラシステムの概略構成図である。 (Embodiment 4)
FIG. 7 is a schematic configuration diagram of an interchangeable lens digital camera system according to the fourth embodiment.
　本実施の形態４に係るレンズ交換式デジタルカメラシステム１００は、カメラ本体１０１と、カメラ本体１０１に着脱自在に接続される交換レンズ装置２０１とを備える。 The interchangeable lens digital camera system 100 according to the fourth embodiment includes a camera body 101 and an interchangeable lens apparatus 201 that is detachably connected to the camera body 101.
　カメラ本体１０１は、交換レンズ装置２０１のズームレンズ系２０２によって形成される光学像を受光して、電気的な画像信号に変換する撮像素子１０２と、撮像素子１０２によって変換された画像信号を表示する液晶モニタ１０３と、カメラマウント部１０４とを含む。一方、交換レンズ装置２０１は、実施の形態１～３いずれかに係るズームレンズ系２０２と、ズームレンズ系２０２を保持する鏡筒２０３と、カメラ本体のカメラマウント部１０４に接続されるレンズマウント部２０４とを含む。カメラマウント部１０４及びレンズマウント部２０４は、物理的な接続のみならず、カメラ本体１０１内のコントローラ（図示せず）と交換レンズ装置２０１内のコントローラ（図示せず）とを電気的に接続し、相互の信号のやり取りを可能とするインターフェースとしても機能する。なお、図７においては、ズームレンズ系２０２として実施の形態１に係るズームレンズ系を用いた場合を図示している。 The camera body 101 receives an optical image formed by the zoom lens system 202 of the interchangeable lens apparatus 201 and converts it into an electrical image signal, and displays the image signal converted by the image sensor 102. A liquid crystal monitor 103 and a camera mount unit 104 are included. On the other hand, the interchangeable lens device 201 includes a zoom lens system 202 according to any of Embodiments 1 to 3, a lens barrel 203 that holds the zoom lens system 202, and a lens mount unit connected to the camera mount unit 104 of the camera body. 204. The camera mount unit 104 and the lens mount unit 204 electrically connect not only a physical connection but also a controller (not shown) in the camera body 101 and a controller (not shown) in the interchangeable lens device 201. It also functions as an interface that enables mutual signal exchange. FIG. 7 illustrates a case where the zoom lens system according to Embodiment 1 is used as the zoom lens system 202.
　本実施の形態４では、実施の形態１～３いずれかに係るズームレンズ系２０２を用いているので、コンパクトで結像性能に優れた交換レンズ装置を低コストで実現することができる。また、本実施の形態４に係るカメラシステム１００全体の小型化及び低コスト化も達成することができる。なお、これら実施の形態１～３に係るズームレンズ系は、全てのズーミング域を使用しなくてもよい。すなわち、所望のズーミング域に応じて、光学性能が確保されている範囲を切り出し、以下の対応する数値実施例１～３で説明するズームレンズ系よりも低倍率のズームレンズ系として使用してもよい。 In Embodiment 4, since the zoom lens system 202 according to any of Embodiments 1 to 3 is used, an interchangeable lens apparatus that is compact and excellent in imaging performance can be realized at low cost. Further, it is possible to reduce the size and cost of the entire camera system 100 according to the fourth embodiment. Note that the zoom lens systems according to Embodiments 1 to 3 do not have to use the entire zooming area. 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 following corresponding numerical examples 1 to 3. Good.
　以上のように、本出願において開示する技術の例示として、実施の形態４を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。 As described above, the fourth embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
　以下、実施の形態１～３に係るズームレンズ系を具体的に実施した数値実施例を説明する。なお、各数値実施例において、表中の長さの単位はすべて「ｍｍ」であり、画角の単位はすべて「°」である。また、各数値実施例において、ｒは曲率半径、ｄは面間隔、ｎｄはｄ線に対する屈折率、νｄはｄ線に対するアッベ数である。また、各数値実施例において、＊印を付した面は非球面であり、非球面形状は次式で定義している。
Figure JPOXMLDOC01-appb-M000001
 ここで、
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
である。 Hereinafter, numerical examples in which the zoom lens systems according to Embodiments 1 to 3 are specifically implemented will be described. In each numerical example, the unit of length in the table is “mm”, and the unit of angle of view is “°”. In each numerical example, r is a radius of curvature, d is a surface interval, nd is a refractive index with respect to the d line, and νd is an Abbe number with respect to the d line. In each numerical example, the surface marked with * is an aspherical surface, and the aspherical shape is defined by the following equation.
Figure JPOXMLDOC01-appb-M000001
 here,
Z: distance from a point on the aspheric surface having a height h from the optical axis to the tangent plane of the aspheric vertex,
h: height from the optical axis,
r: vertex radius of curvature,
κ: conic constant,
An: n-order aspherical coefficient.
　図２、４及び６は、各々数値実施例１～３に係るズームレンズ系の無限遠合焦状態の縦収差図である。 2, 4 and 6 are longitudinal aberration diagrams of the zoom lens system according to Numerical Examples 1 to 3 in an infinitely focused state, respectively.
　各縦収差図において、（ａ）図は広角端、（ｂ）図は中間位置、（ｃ）図は望遠端における各収差を表す。各縦収差図は、左側から順に、球面収差（ＳＡ（ｍｍ））、非点収差（ＡＳＴ（ｍｍ））、歪曲収差（ＤＩＳ（％））を示す。球面収差図において、縦軸はＦナンバー（図中、Ｆで示す）を表し、実線はｄ線（ｄ－ｌｉｎｅ）、短破線はＦ線（Ｆ－ｌｉｎｅ）、長破線はＣ線（Ｃ－ｌｉｎｅ）の特性である。非点収差図において、縦軸は像高（図中、Ｈで示す）を表し、実線はサジタル平面（図中、ｓで示す）、破線はメリディオナル平面（図中、ｍで示す）の特性である。歪曲収差図において、縦軸は像高（図中、Ｈで示す）を表す。 In each longitudinal aberration diagram, (a) 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. In the spherical aberration diagram, 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). In the astigmatism diagram, the vertical axis represents the image height (indicated by H in the figure), the solid line represents the sagittal plane (indicated by s), and the broken line represents the meridional plane (indicated by m in the figure). is there. In the distortion diagram, the vertical axis represents the image height (indicated by H in the figure).
（数値実施例１）
　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、無限遠合焦状態での各種データを表３に、ズームレンズ群データを表４に示す。 (Numerical example 1)
The zoom lens system of Numerical Example 1 corresponds to Embodiment 1 shown in FIG. Table 1 shows surface data of the zoom lens system of Numerical Example 1, Table 2 shows aspherical data, Table 3 shows various data in the infinite focus state, and Table 4 shows zoom lens group data.
表　１（面データ）
 
  面番号         r           d           nd         vd     
    物面             ∞                                    
     1         44.27700     4.20000     1.48749    70.4    
     2               ∞     0.20000                        
     3         38.42600     1.20000     1.80100    35.0    
     4         23.09300     6.00000     1.49700    81.6    
     5        139.11200        可変                        
     6        400.00000     0.60000     1.80450    39.6    
     7         12.14200     2.00000     1.92286    20.9    
     8         25.50000     1.81000                        
     9        -43.77500     0.60000     1.80420    46.5    
    10         67.77300        可変                        
    11*        17.73500     4.20000     1.80755    40.9    
    12*      -396.27400     2.00000                        
  13(絞り)           ∞     1.70000                        
    14         75.47700     0.60000     1.90366    31.3    
    15         11.83500     3.20000     1.49700    81.6    
    16         55.71600     0.76000                        
    17*        21.35300     3.60000     1.58250    59.4    
    18        -21.35300     0.60000     1.75520    27.5    
    19        -34.72700        可変                        
    20         44.24600     0.50000     1.72916    54.7    
    21         15.08300        可変                        
    22        -16.27400     0.70000     1.72916    54.7    
    23        -74.53400        可変                        
    24       -147.97100     3.00000     1.84666    23.8    
    25        -23.42500        (BF)                        
    像面             ∞                                     Table 1 (surface data)

Surface number r d nd vd
Object ∞
1 44.27700 4.20000 1.48749 70.4
2 ∞ 0.20000
3 38.42600 1.20000 1.80 100 35.0
4 23.09300 6.00000 1.49700 81.6
5 139.11200 Variable
6 400.00000 0.60000 1.80450 39.6
7 12.14200 2.00000 1.92286 20.9
8 25.50000 1.81000
9 -43.77500 0.60000 1.80420 46.5
10 67.77300 Variable
11 * 17.73500 4.20000 1.80755 40.9
12 * -396.27400 2.00000
13 (Aperture) ∞ 1.70000
14 75.47700 0.60000 1.90366 31.3
15 11.83500 3.20000 1.49700 81.6
16 55.71600 0.76000
17 * 21.35300 3.60000 1.58250 59.4
18 -21.35300 0.60000 1.75520 27.5
19 -34.72700 Variable
20 44.24600 0.50000 1.72916 54.7
21 15.08300 Variable
22 -16.27400 0.70000 1.72916 54.7
23 -74.53400 Variable
24 -147.97100 3.00000 1.84666 23.8
25 -23.42500 (BF)
Image plane ∞
表　２（非球面データ）
 
  第11面
   K= 0.00000E+00, A4=-8.98800E-06, A6=-4.12000E-08, A8= 1.29600E-10 
   A10=-1.17900E-11 
  第12面
   K= 0.00000E+00, A4= 1.41500E-05, A6=-1.88800E-08, A8=-1.01700E-09 
   A10=-3.78100E-12 
  第17面
   K= 0.00000E+00, A4=-1.87500E-05, A6=-7.53000E-08, A8= 2.31200E-10 
   A10= 1.93800E-13 Table 2 (Aspheric data)

11th surface K = 0.00000E + 00, A4 = -8.98800E-06, A6 = -4.12000E-08, A8 = 1.29600E-10
A10 = -1.17900E-11
12th surface K = 0.00000E + 00, A4 = 1.41500E-05, A6 = -1.88800E-08, A8 = -1.01700E-09
A10 = -3.78100E-12
17th surface K = 0.00000E + 00, A4 = -1.87500E-05, A6 = -7.53000E-08, A8 = 2.31200E-10
A10 = 1.93800E-13
表　３（無限遠合焦状態での各種データ）
 
  ズーム比     3.70254
                広角      中間      望遠
  焦点距離      45.1684   87.7062  167.2377
 Ｆナンバー     4.15704   5.44688   5.83639
    画角        13.5369    6.8993    3.6302
    像高        10.8150   10.8150   10.8150
 レンズ全長    107.5269  107.5266  107.5268
    ＢＦ       14.60331  14.60288  14.60312
    d5           1.9704   15.2517   26.9947 
    d10         25.7814   12.5001    0.7571 
    d19          2.9764    6.2268    2.1414 
    d21         23.0885   17.7935   19.9087 
    d23          1.6369    3.6816    5.6518 Table 3 (Various data in focus at infinity)

Zoom ratio 3.70254
Wide angle Medium telephoto Focal length 45.1684 87.7062 167.2377
F number 4.15704 5.44688 5.83639
Angle of view 13.5369 6.8993 3.6302
Image height 10.8150 10.8150 10.8150
Total lens length 107.5269 107.5266 107.5268
BF 14.60331 14.60288 14.60312
d5 1.9704 15.2517 26.9947
d10 25.7814 12.5001 0.7571
d19 2.9764 6.2268 2.1414
d21 23.0885 17.7935 19.9087
d23 1.6369 3.6816 5.6518
表　４（ズームレンズ群データ）
 
ズームレンズ群データ
  群   始面    焦点距離
   1      1    64.11496
   2      6   -18.08308
   3     11    20.11986
   4     20   -31.61243
   5     22   -28.69864
   6     24    32.51215 Table 4 (Zoom lens group data)

Zoom lens group data Group Start surface Focal length 1 1 64.11496
2 6 -18.08308
3 11 20.11986
4 20 -31.61243
5 22 -28.69864
6 24 32.51215
（数値実施例２）
　数値実施例２のズームレンズ系は、図３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５に、非球面データを表６に、無限遠合焦状態での各種データを表７に、ズームレンズ群データを表８に示す。 (Numerical example 2)
The zoom lens system of Numerical Example 2 corresponds to Embodiment 2 shown in FIG. Table 5 shows surface data of the zoom lens system of Numerical Example 2, Table 6 shows aspherical data, Table 7 shows various data in the infinite focus state, and Table 8 shows zoom lens group data.
表　５（面データ）
 
  面番号         r           d           nd         vd      
    物面             ∞                                               
     1         54.41040     4.14360     1.48749    70.4               
     2       -293.27140     0.15000                                   
     3         36.94460     1.00000     1.85026    32.3    
     4         24.75170     5.00000     1.49700    81.6               
     5        117.48200        可変                                   
     6        301.14950     0.80000     1.80610    33.3               
     7         13.15300     2.52470     1.94595    18.0               
     8         24.75260     1.78100                           
     9        -39.95940     0.70000     1.80420    46.5               
    10         96.01890        可変                                   
    11*        18.17730     4.95600     1.73077    40.5      
    12*      -253.12250     1.72610                      
  13(絞り)           ∞     1.50000                        
    14         52.26690     0.80000     1.90366    31.3               
    15         12.49740     3.67240     1.48749    70.4               
    16         40.70060     1.60000                      
    17*        22.25730     4.86170     1.58913    61.3               
    18        -21.73980     0.70000     1.76182    26.6               
    19        -34.31440        可変                        
    20         41.62800     0.70000     1.77250    49.6               
    21         15.84430        可変                                   
    22        -27.25020     0.80000     1.80420    46.5    
    23         95.39660        可変                                   
    24         51.14230     4.04330     1.84666    23.8               
    25        -54.85370        (BF)                                       
    像面             ∞                                                Table 5 (surface data)

Surface number r d nd vd
Object ∞
1 54.41040 4.14360 1.48749 70.4
2 -293.27140 0.15000
3 36.94460 1.00000 1.85026 32.3
4 24.75170 5.00000 1.49700 81.6
5 117.48200 Variable
6 301.14950 0.80000 1.80610 33.3
7 13.15300 2.52470 1.94595 18.0
8 24.75260 1.78100
9 -39.95940 0.70000 1.80420 46.5
10 96.01890 Variable
11 * 18.17730 4.95600 1.73077 40.5
12 * -253.12250 1.72610
13 (Aperture) ∞ 1.50000
14 52.26690 0.80000 1.90366 31.3
15 12.49740 3.67240 1.48749 70.4
16 40.70060 1.60000
17 * 22.25730 4.86170 1.58913 61.3
18 -21.73980 0.70000 1.76182 26.6
19 -34.31440 Variable
20 41.62800 0.70000 1.77250 49.6
21 15.84430 Variable
22 -27.25020 0.80000 1.80420 46.5
23 95.39660 Variable
24 51.14230 4.04330 1.84666 23.8
25 -54.85370 (BF)
Image plane ∞
表　６（非球面データ）
 
  第11面
   K= 0.00000E+00, A4=-1.54188E-05, A6=-2.75157E-08, A8=-4.74648E-10 
   A10=-1.13024E-11 
  第12面
   K= 0.00000E+00, A4= 4.31960E-06, A6= 5.50026E-08, A8=-2.58606E-09 
   A10= 1.91498E-12 
  第17面
   K= 0.00000E+00, A4=-2.18056E-05, A6= 1.16544E-07, A8=-4.22953E-09 
   A10= 3.78677E-11 Table 6 (Aspheric data)

11th surface K = 0.00000E + 00, A4 = -1.54188E-05, A6 = -2.75157E-08, A8 = -4.74648E-10
A10 = -1.13024E-11
12th surface K = 0.00000E + 00, A4 = 4.31960E-06, A6 = 5.50026E-08, A8 = -2.58606E-09
A10 = 1.91498E-12
17th surface K = 0.00000E + 00, A4 = -2.18056E-05, A6 = 1.16544E-07, A8 = -4.22953E-09
A10 = 3.78677E-11
表　７（無限遠合焦状態での各種データ）
 
  ズーム比     3.66240
                広角      中間      望遠
  焦点距離      46.3500   88.7110  169.7522
 Ｆナンバー     4.12028   4.94446   5.76874
    画角        13.2932    6.8442    3.5698
    像高        10.8150   10.8150   10.8150
 レンズ全長    113.0000  113.0000  113.0000
    ＢＦ        15.0500   15.0500   15.0500
    d5           1.3403   14.9343   27.0803 
    d10         26.7801   13.1861    1.0401 
    d19          2.6022    6.1992    2.6009 
    d21         24.2675   17.7767   16.9793 
    d23          1.5000    4.3935    8.7890 Table 7 (Various data in focus at infinity)

Zoom ratio 3.66240
Wide angle Medium telephoto Focal length 46.3500 88.7110 169.7522
F number 4.12028 4.94446 5.76874
Angle of view 13.2932 6.8442 3.5698
Image height 10.8150 10.8150 10.8150
Total lens length 113.0000 113.0000 113.0000
BF 15.0500 15.0500 15.0500
d5 1.3403 14.9343 27.0803
d10 26.7801 13.1861 1.0401
d19 2.6022 6.1992 2.6009
d21 24.2675 17.7767 16.9793
d23 1.5000 4.3935 8.7890
表　８（ズームレンズ群データ）
 
  群    始面      焦点距離
   1       1      64.20355
   2       6     -18.66879
   3      11      21.49452
   4      20     -33.51074
   5      22     -26.27977
   6      24      31.81621 Table 8 (Zoom lens group data)

Group Start surface Focal length 1 1 64.20355
2 6 -18.66879
3 11 21.49452
4 20 -33.51074
5 22 -26.27977
6 24 31.81621
（数値実施例３）
　数値実施例３のズームレンズ系は、図５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９に、非球面データを表１０に、無限遠合焦状態での各種データを表１１に、ズームレンズ群データを表１２に示す。 (Numerical Example 3)
The zoom lens system of Numerical Example 3 corresponds to Embodiment 3 shown in FIG. Table 9 shows surface data of the zoom lens system of Numerical Example 3, Table 10 shows aspherical data, Table 11 shows various data in the infinite focus state, and Table 12 shows zoom lens group data.
表　９（面データ）
 
  面番号         r           d           nd         vd      
    物面             ∞                                               
     1         52.46760     4.15940     1.48749    70.4               
     2       -407.64530     0.15000                                   
     3         38.23060     1.00000     1.85026    32.3    
     4         25.20510     5.00000     1.49700    81.6               
     5        129.43900        可変                                   
     6       2778.04750     0.80000     1.80610    33.3               
     7         13.08600     2.75520     1.94595    18.0               
     8         25.68890     1.83070                            
     9        -42.55260     0.70000     1.80420    46.5               
    10         86.70890        可変                                   
    11*        17.83120     4.46360     1.73077    40.5       
    12*      -576.28030     1.50000                       
  13(絞り)           ∞     1.81190                            
    14         47.08860     0.80000     1.90366    31.3               
    15         12.29520     3.25150     1.48749    70.4               
    16         32.66250     1.60000                        
    17*        21.11200     4.78080     1.58913    61.3               
    18        -20.48360     0.70000     1.76182    26.6               
    19        -32.10520        可変                      
    20         41.20810     0.70000     1.77250    49.6               
    21         15.96640        可変                                   
    22        -25.70460     0.80000     1.80420    46.5   
    23        150.29810        可変                                   
    24         48.80450     3.86020     1.84666    23.8               
    25        -62.39650        (BF)                                       
    像面             ∞                                                Table 9 (surface data)

Surface number r d nd vd
Object ∞
1 52.46760 4.15940 1.48749 70.4
2 -407.64530 0.15000
3 38.23060 1.00000 1.85026 32.3
4 25.20510 5.00000 1.49700 81.6
5 129.43900 Variable
6 2778.04750 0.80000 1.80610 33.3
7 13.08600 2.75520 1.94595 18.0
8 25.68890 1.83070
9 -42.55260 0.70000 1.80420 46.5
10 86.70890 Variable
11 * 17.83120 4.46360 1.73077 40.5
12 * -576.28030 1.50000
13 (Aperture) ∞ 1.81190
14 47.08860 0.80000 1.90366 31.3
15 12.29520 3.25150 1.48749 70.4
16 32.66250 1.60000
17 * 21.11200 4.78080 1.58913 61.3
18 -20.48360 0.70000 1.76182 26.6
19 -32.10520 Variable
20 41.20810 0.70000 1.77250 49.6
21 15.96640 Variable
22 -25.70460 0.80000 1.80420 46.5
23 150.29810 Variable
24 48.80450 3.86020 1.84666 23.8
25 -62.39650 (BF)
Image plane ∞
表　１０（非球面データ）
 
  第11面
   K= 0.00000E+00, A4=-1.43612E-05, A6=-3.62480E-08, A8=-7.23570E-10 
   A10=-1.72076E-11 
  第12面
   K= 0.00000E+00, A4= 5.11168E-06, A6= 6.26978E-08, A8=-3.69572E-09 
   A10= 3.28797E-12 
  第17面
   K= 0.00000E+00, A4=-2.56446E-05, A6= 1.59804E-07, A8=-6.31554E-09 
   A10= 6.06385E-11 Table 10 (Aspheric data)

11th surface K = 0.00000E + 00, A4 = -1.43612E-05, A6 = -3.62480E-08, A8 = -7.23570E-10
A10 = -1.72076E-11
12th surface K = 0.00000E + 00, A4 = 5.11168E-06, A6 = 6.26978E-08, A8 = -3.69572E-09
A10 = 3.28797E-12
17th surface K = 0.00000E + 00, A4 = -2.56446E-05, A6 = 1.59804E-07, A8 = -6.31554E-09
A10 = 6.06385E-11
表　１１（無限遠合焦状態での各種データ）
 
  ズーム比     4.12011
                広角      中間      望遠
  焦点距離      41.2009   83.6385  169.7522
 Ｆナンバー     4.12045   4.94434   5.76880
    画角        15.0713    7.2766    3.5687
    像高        10.8150   10.8150   10.8150
 レンズ全長    113.0000  113.0000  113.0000
    ＢＦ        15.0500   15.0500   15.0500
    d5           1.2771   16.2363   29.2344 
    d10         29.0966   14.1374    1.1393 
    d19          2.5752    6.5702    2.6025 
    d21         22.8367   16.3131   15.6434 
    d23          1.5000    4.0286    8.6660 Table 11 (Various data in focus at infinity)

Zoom ratio 4.12011
Wide angle Medium telephoto Focal length 41.2009 83.6385 169.7522
F number 4.12045 4.94434 5.76880
Angle of view 15.0713 7.2766 3.5687
Image height 10.8150 10.8150 10.8150
Total lens length 113.0000 113.0000 113.0000
BF 15.0500 15.0500 15.0500
d5 1.2771 16.2363 29.2344
d10 29.0966 14.1374 1.1393
d19 2.5752 6.5702 2.6025
d21 22.8367 16.3131 15.6434
d23 1.5000 4.0286 8.6660
表　１２（ズームレンズ群データ）
 
  群    始面      焦点距離
   1       1      65.48877
   2       6     -18.35962
   3      11      21.32502
   4      20     -34.15493
   5      22     -27.23969
   6      24      32.86762 Table 12 (Zoom lens group data)

Group Start surface Focal length 1 1 65.48877
2 6 -18.35962
3 11 21.32502
4 20 -34.15493
5 22 -27.23969
6 24 32.86762
　以下の表１３に、各数値実施例のズームレンズ系における各条件の対応値を示す。 Table 13 below shows the corresponding values for each condition in the zoom lens system of each numerical example.
表　１３（条件の対応値）
Figure JPOXMLDOC01-appb-T000001
 Table 13 (corresponding values of conditions)
Figure JPOXMLDOC01-appb-T000001
　以上のように、本開示における技術の例示として、実施の形態を説明した。そのために、添付図面および詳細な説明を提供した。 As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.
　したがって、添付図面および詳細な説明に記載された構成要素の中には、課題解決のために必須な構成要素だけでなく、上記技術を例示するために、課題解決のためには必須でない構成要素も含まれ得る。そのため、それらの必須ではない構成要素が添付図面や詳細な説明に記載されていることをもって、直ちに、それらの必須ではない構成要素が必須であるとの認定をするべきではない。 Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.
　また、上述の実施の形態は、本開示における技術を例示するためのものであるから、特許請求の範囲またはその均等の範囲において種々の変更、置き換え、付加、省略などを行うことができる。 In addition, since the above-described embodiments are for illustrating the technique in the present disclosure, various modifications, replacements, additions, omissions, and the like can be made within the scope of the claims and the equivalents thereof.
　本開示は、例えばデジタルスチルカメラ、デジタルビデオカメラ、スマートフォン等の携帯情報端末のカメラ、ＰＤＡ（Ｐｅｒｓｏｎａｌ　Ｄｉｇｉｔａｌ　Ａｓｓｉｓｔａｎｃｅ）のカメラ、監視システムにおける監視カメラ、Ｗｅｂカメラ、車載カメラ等に適用可能である。特に本開示は、デジタルスチルカメラシステム、デジタルビデオカメラシステムといった高画質が要求される撮影光学系に好適である。 The present disclosure is applicable to, for example, a digital still camera, a digital video camera, a camera of a portable information terminal such as a smartphone, a PDA (Personal Digital Assistance) camera, a surveillance camera in a surveillance system, a Web camera, an in-vehicle camera, and the like. In particular, the present disclosure is suitable for a photographing optical system that requires high image quality, such as a digital still camera system and a digital video camera system.
　また本開示におけるズームレンズ系は、本開示における交換レンズ装置の中でも、デジタルビデオカメラシステムに備えられる、ズームレンズ系をモータにより駆動する電動ズーム機能を搭載した交換レンズ装置に適用することが可能である。 In addition, the zoom lens system according to the present disclosure can be applied to an interchangeable lens device equipped with an electric zoom function for driving the zoom lens system with a motor, which is included in the digital video camera system, among the interchangeable lens devices according to the present disclosure. is there.
Ｇ１　　第１レンズ群
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
Ｇ６　　第６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
Ｌ１３　第１３レンズ素子
Ｌ１４　第１４レンズ素子
Ａ　　　開口絞り
Ｓ　　　像面
１００　レンズ交換式デジタルカメラシステム
１０１　カメラ本体
１０２　撮像素子
１０３　液晶モニタ
１０４　カメラマウント部
２０１　交換レンズ装置
２０２　ズームレンズ系
２０３　鏡筒
２０４　レンズマウント部
  G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group G6 6th lens group L1 1st lens element L2 2nd lens element L3 3rd lens element L4 4th lens element L5 5th lens element L6 6th lens element L7 7th lens element L8 8th lens element L9 9th lens element L10 10th lens element L11 11th lens element L12 12th lens element L13 13th lens element L14 14th lens element A Aperture stop S Image surface 100 Lens interchangeable digital camera system 101 Camera body 102 Image sensor 103 Liquid crystal monitor 104 Camera mount unit 201 Interchangeable lens device 202 Zoom lens system 203 Lens barrel 204 Lens mount unit

Claims (4)

  1. 　少なくとも１枚のレンズ素子で構成されたレンズ群を複数有するズームレンズ系であって、
    最物体側に配置されたレンズ群及び最像側に配置されたレンズ群が、撮像時の広角端から望遠端へのズーミングの際に像面に対して固定されており、かつ、全レンズ群のうち少なくとも３つのレンズ群が、該ズーミングの際に光軸に沿って移動する移動レンズ群であり、
    以下の条件（１）及び（２）を満足する、ズームレンズ系：
    　　Ｍ－Ｎ≦３　・・・（１）
    　　０．１≦Ｔ１／ｆＷ≦１．５　・・・（２）
    ここで、
    　Ｍ：全移動レンズ群を構成するレンズ素子の総数、
    　Ｎ：移動レンズ群の総数、
    　Ｔ１：最物体側に配置されたレンズ群の最物体側レンズ面から最像側レンズ面までの光軸上の距離、
    　ｆＷ：広角端における全系のｄ線での焦点距離
    である。     A zoom lens system having a plurality of lens groups each composed of at least one lens element,
    The lens group arranged on the most object side and the lens group arranged on the most image side are fixed with respect to the image plane during zooming from the wide-angle end to the telephoto end during imaging, and all the lens groups At least three lens groups are movable lens groups that move along the optical axis during zooming,
    A zoom lens system that satisfies the following conditions (1) and (2):
    MN ≦ 3 (1)
    0.1 ≦ T 1 / f W ≦ 1.5 (2)
    here,
    M: total number of lens elements constituting all moving lens groups,
    N: total number of moving lens groups,
    T 1 : a distance on the optical axis from the most object side lens surface to the most image side lens surface of the lens unit disposed on the most object side,
    f W : The focal length of the entire system at the d-line at the wide angle end.
  2. 　全移動レンズ群のうち少なくとも２つのレンズ群が、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光軸に沿って移動するフォーカシングレンズ群であり、該フォーカシングレンズ群がいずれも、１枚のレンズ素子で構成されている、請求項１に記載のズームレンズ系。 At least two lens groups among all moving lens groups are focusing lens groups that move along the optical axis during focusing from an infinitely focused state to a close object focused state. The zoom lens system according to claim 1, comprising a single lens element.
  3. 　請求項１に記載のズームレンズ系と、
    前記ズームレンズ系が形成する光学像を受光して電気的な画像信号に変換する撮像素子を含むカメラ本体との接続が可能なレンズマウント部と
    を備える、交換レンズ装置。     A zoom lens system according to claim 1;
    An interchangeable lens apparatus comprising: a lens mount unit that can be connected to a camera body including an imaging element that receives an optical image formed by the zoom lens system and converts the optical image into an electrical image signal.
  4. 　請求項１に記載のズームレンズ系を含む交換レンズ装置と、
    前記交換レンズ装置とカメラマウント部を介して着脱可能に接続され、前記ズームレンズ系が形成する光学像を受光して電気的な画像信号に変換する撮像素子を含むカメラ本体と
    を備える、カメラシステム。
          An interchangeable lens device comprising the zoom lens system according to claim 1;
    A camera system comprising: the interchangeable lens device and a camera main body including an image sensor that is detachably connected via a camera mount unit and receives an optical image formed by the zoom lens system and converts the optical image into an electrical image signal. .
PCT/JP2012/005099 2011-08-25 2012-08-10 Zoom-lens system, interchangeable lens device, and camera system WO2013027363A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08122857A (en) * 1994-10-20 1996-05-17 Ricoh Co Ltd Optical system of real image type variable power finder
JPH08129202A (en) * 1994-10-31 1996-05-21 Canon Inc Variable power finder optical system
JPH1010440A (en) * 1996-06-21 1998-01-16 Canon Inc Finder optical system
JP2011048232A (en) * 2009-08-28 2011-03-10 Panasonic Corp Optical system enabling short-distance photography and optical device using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08122857A (en) * 1994-10-20 1996-05-17 Ricoh Co Ltd Optical system of real image type variable power finder
JPH08129202A (en) * 1994-10-31 1996-05-21 Canon Inc Variable power finder optical system
JPH1010440A (en) * 1996-06-21 1998-01-16 Canon Inc Finder optical system
JP2011048232A (en) * 2009-08-28 2011-03-10 Panasonic Corp Optical system enabling short-distance photography and optical device using the same

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