JP2002006217A - Zoom lens provided with vibration-proof function and optical equipment using the same - Google Patents

Zoom lens provided with vibration-proof function and optical equipment using the same

Info

Publication number
JP2002006217A
JP2002006217A JP2000187649A JP2000187649A JP2002006217A JP 2002006217 A JP2002006217 A JP 2002006217A JP 2000187649 A JP2000187649 A JP 2000187649A JP 2000187649 A JP2000187649 A JP 2000187649A JP 2002006217 A JP2002006217 A JP 2002006217A
Authority
JP
Japan
Prior art keywords
lens
refractive power
zoom lens
image
zoom
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2000187649A
Other languages
Japanese (ja)
Other versions
JP4630424B2 (en
JP2002006217A5 (en
Inventor
Takashi Shirasago
貴司 白砂
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP2000187649A priority Critical patent/JP4630424B2/en
Publication of JP2002006217A publication Critical patent/JP2002006217A/en
Publication of JP2002006217A5 publication Critical patent/JP2002006217A5/ja
Application granted granted Critical
Publication of JP4630424B2 publication Critical patent/JP4630424B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical 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
    • G02B15/144Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1441Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
    • G02B15/144113Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens provided with vibration proof function capable of easily maintaining a good optical performance all over the variable power area to which vibration compensation is easily given with a simple configuration, and to provide optical equipment using the zoom lens. SOLUTION: As for the zoom lens with the vibration-proof function, the zoom lens is provide with a 1st lens group whose refractive power is positive, a 2nd lens group whose refractive power is negative, an aperture diaphragm, a 3rd lens group whose refractive power is positive and a 4th lens group whose refractive power is positive in order form an object side, and at varying the power from a wide angle end to a telephoto end, at least the 1st, 3rd and 4th lens groups are moved on the optical axis so as to change an air distance between respective lens groups, and the 3rd lens group is provided with a 3rd group lens 3n composed of a single lens whose refractive power is negative positioned closest to the image side, and by moving the 3rd group lens 3n in a direction vertical to the optical axis, the image blurring caused by the vibration of the zoom lens is corrected.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は防振機能を有したズ
ームレンズ及びそれを用いた光学機器に関し、特にズー
ムレンズの一部の単レンズを光軸と垂直方向に移動させ
ることにより、該ズームレンズが振動(傾動)したとき
の撮影画像のブレを光学的に補正して静止画像を得るよ
うにし撮影画像の安定化を図ったフィルム用カメラ、ビ
デオカメラ、デジタルカメラ等の光学機器等に好適なも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens having an image stabilizing function and an optical apparatus using the same, and more particularly to a zoom lens by moving a part of a single lens in a direction perpendicular to an optical axis. Suitable for optical devices such as film cameras, video cameras, and digital cameras that stabilize the captured image by optically correcting the blur of the captured image when the lens vibrates (tilt) to obtain a still image. It is something.
【0002】[0002]
【従来の技術】近年、写真用カメラ、ビデオカメラ、そ
してディジタルカメラ等においては、より高画質化や撮
影条件の拡大の目的のため手振れ等による撮影画像のブ
レを補正する防振機能を有したズームレンズが要望され
ており、そのような防振機能を有した光学系が多く提案
されている。
2. Description of the Related Art In recent years, photographic cameras, video cameras, digital cameras, and the like have provided an image stabilizing function for correcting blurring of a photographed image due to camera shake for the purpose of improving image quality and expanding photographing conditions. There is a demand for a zoom lens, and many optical systems having such an anti-vibration function have been proposed.
【0003】防振機能を有したズームレンズとしては、
例えば特開平5−232410号公報では、物体側より
正、負、正、正の屈折力のレンズ群より成る4群ズーム
レンズにおいて第2群全体を光軸に対して垂直方向に移
動させることによって手ぶれ補正を行うズームレンズが
提案されている。前記提案は、変倍時に機能する1つの
レンズ群全体を偏心させることで、光学系にぶれが生じ
た際の結像位置の補正を行うものである。
[0003] As a zoom lens having a vibration proof function,
For example, in Japanese Patent Application Laid-Open No. Hei 5-232410, in a four-unit zoom lens composed of lens units having positive, negative, positive, and positive refractive power from the object side, the entire second unit is moved in a direction perpendicular to the optical axis. A zoom lens that performs camera shake correction has been proposed. The above proposal is to correct an image forming position when a blur occurs in an optical system by decentering one entire lens group that functions during zooming.
【0004】また、変倍時に機能するレンズ群の一部を
偏心させて光学系にぶれが生じた際の結像位置の補正を
行うものとして、特開平9−230236号公報では、
物体側より順に正、負、正、正の屈折力のレンズ群より
成る4群ズームレンズにおいて第3レンズ群を正と正の
屈折力のレンズ群に分離し、片方のレンズ群を光軸と垂
直方向に移動させることで像ブレ補正を行っている。ま
た特開平7−128619号公報では物体側から正、
負、正、正の屈折力のレンズ群より成る4群ズームにお
いて第3レンズ群を負と正の屈折力のレンズ群に分離し
て、その正の屈折力のレンズ群を光軸と垂直方向に移動
させることで像ブレ補正を行っている。
Japanese Patent Application Laid-Open No. 9-230236 discloses a technique for correcting the image forming position when a blur occurs in an optical system by decentering a part of a lens group functioning during zooming.
In a four-unit zoom lens composed of lens units having positive, negative, positive, and positive refractive powers in order from the object side, the third lens unit is separated into lens units having positive and positive refractive powers, and one lens unit is defined as an optical axis. Image blur correction is performed by moving the image in the vertical direction. Also, in Japanese Patent Application Laid-Open No. 7-128319,
In a four-unit zoom system including a lens unit having negative, positive and positive refractive powers, the third lens unit is divided into lens units having negative and positive refractive powers, and the lens unit having positive refractive power is perpendicular to the optical axis. To perform image blur correction.
【0005】特開平7−199124号公報では、正、
負、正、そして正の屈折力の4つのレンズ群より成る4
群構成の変倍光学系において、第3群全体を光軸と垂直
方向に振動させて防振を行っている。
In Japanese Patent Application Laid-Open No. 7-199124,
4 consisting of 4 lens groups with negative, positive and positive refractive power
In the variable power optical system having the group configuration, the entire third unit is vibrated in a direction perpendicular to the optical axis to perform vibration reduction.
【0006】[0006]
【発明が解決しようとする課題】一般に複数のレンズを
画像ブレ補正のために光軸に対して垂直方向に移動させ
る構成では、移動させるレンズの重量が大きく、そのレ
ンズを保持するレンズ枠部も大きなものとなってくる。
このため、ブレ補正駆動を行う手ぶれ駆動系に大きな負
担がかかり、その結果手振れ駆動系が大型化し、又偏心
に対するレスポンスが遅れてくる。
Generally, in a configuration in which a plurality of lenses are moved in a direction perpendicular to the optical axis for image blur correction, the weight of the lens to be moved is large, and the lens frame holding the lens is also large. It becomes big.
For this reason, a large load is imposed on the camera shake drive system that performs the shake correction drive, and as a result, the camera shake drive system becomes large, and the response to the eccentricity is delayed.
【0007】特開平9−230235号公報で提案され
ているズームレンズでは、1枚のレンズを手ぶれ補正の
ために偏心させる構成となっているため、画像ぶれ補正
のために移動させるレンズは軽量である。しかし、主に
偏心により発生する諸収差の補正のために補正レンズを
正、負のレンズの貼り合わせ構成としており、ぶれ補正
レンズの小型化、軽量化という面でまだ検討の余地があ
った。
The zoom lens proposed in Japanese Patent Application Laid-Open No. 9-230235 has a configuration in which one lens is decentered for camera shake correction. Therefore, the lens moved for image shake correction is lightweight. is there. However, in order to correct various aberrations mainly caused by eccentricity, the correction lens has a configuration in which a positive lens and a negative lens are bonded to each other, and there is still room for study in terms of reducing the size and weight of the shake correction lens.
【0008】本発明は、ズームレンズの一部を構成する
比較的小型軽量な一枚の単レンズを光軸と垂直方向に移
動させて、ズームレンズが振動(傾動)したときの画像
のブレを補正することにより、装置全体の小型化、機構
上の簡素化及び駆動手段の負荷の軽減化を図りつつ画像
ぶれを効果的に補正することができるズームレンズ及び
それを用いた光学機器の提供を目的とする。
According to the present invention, a relatively small and light single lens constituting a part of a zoom lens is moved in a direction perpendicular to an optical axis to reduce image blur when the zoom lens vibrates (tilts). By providing correction, it is possible to provide a zoom lens that can effectively correct image blur while reducing the size of the entire apparatus, simplifying the mechanism, and reducing the load on the driving unit, and providing an optical apparatus using the same. Aim.
【0009】[0009]
【課題を解決するための手段】請求項1の発明の防振機
能を有したズームレンズは物体側より順に、正の屈折力
を有する第1レンズ群、負の屈折力を有する第2レンズ
群、開口絞り、正の屈折力を有する第3レンズ群、正の
屈折力を有する第4レンズ群を有し、広角端から望遠端
への変倍時には、少なくとも該第1、第3、第4レンズ
群が光軸上を移動することで各レンズ群官の空気間隔を
変化させるズームレンズであって該第3レンズ群は最も
像側に負の屈折力の単レンズよりなる第3nレンズを有
し、該第3nレンズを光軸に対し垂直方向に移動するこ
とにより該ズームレンズが振動したときに生ずる画像ブ
レの補正を行うことを特徴としている。
According to a first aspect of the present invention, there is provided a zoom lens having an anti-vibration function, in order from the object side, a first lens group having a positive refractive power and a second lens group having a negative refractive power. , An aperture stop, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and at the time of zooming from the wide-angle end to the telephoto end, at least the first, third, and fourth lens groups. A zoom lens that changes the air gap between each lens group by moving the lens group on the optical axis, and the third lens group has a third (n) lens, which is a single lens having a negative refractive power, closest to the image side. By moving the 3n lens in a direction perpendicular to the optical axis, image blur caused when the zoom lens vibrates is corrected.
【0010】請求項2の発明は請求項1の発明において
前記第3nレンズの材質のアッベ数をν3nとしたとき ν3n>45 ・・・(1) なる条件を満足することを特徴としている。
A second aspect of the present invention is characterized in that, when the Abbe number of the material of the 3n lens is ν3n, the condition of ν3n> 45 (1) is satisfied.
【0011】請求項3の発明は請求項1又は2の発明に
おいて前記第3nレンズの焦点距離をf3n、前記第3
レンズ群の焦点距離をf3、広角端における全系の焦点
距離をfw、望遠端における全系の焦点距離をftとし
たとき、 −3.5<f3n/f3<−1.5 ・・・(2)
According to a third aspect of the present invention, in the first or second aspect, the focal length of the 3n lens is f3n, and
When the focal length of the lens group is f3, the focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is ft, -3.5 <f3n / f3 <-1.5 (1.5) 2)
【0012】[0012]
【数3】 (Equation 3)
【0013】なる条件を満足することを特徴としてい
る。
It is characterized by satisfying the following conditions.
【0014】請求項4の発明は請求項1、2又は3の発
明において第iレンズ群の焦点距離をfi、広角端にお
ける全系の焦点距離をfw、望遠端における全系の焦点
距離をftとしたとき
According to a fourth aspect of the present invention, the focal length of the i-th lens unit is fi, the focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is ft. And when
【0015】[0015]
【数4】 (Equation 4)
【0016】なる条件を満足することを特徴としてい
る。
It is characterized by satisfying the following conditions.
【0017】請求項5の発明は請求項1から4のいずれ
か1項の発明において前記第2レンズ群は、その最も物
体側のレンズ面に、光軸に対して回転対称な非球面を有
することを特徴としている。
According to a fifth aspect of the present invention, in the first aspect of the present invention, the second lens group has an aspherical surface rotationally symmetric with respect to an optical axis on a lens surface closest to the object. It is characterized by:
【0018】請求項6の発明は請求項1から5のいずれ
か1項の発明において前記第4レンズ群は少なくとも1
面に、光軸に対して回転対称な非球面を有することを特
徴としている。
According to a sixth aspect of the present invention, in the first aspect of the present invention, the fourth lens group includes at least one lens.
It is characterized in that the surface has an aspherical surface that is rotationally symmetric with respect to the optical axis.
【0019】請求項7の発明の光学機器は請求項1から
6のいずれか1項の防振機能を有したズームレンズを有
していることを特徴としている。
According to a seventh aspect of the present invention, there is provided an optical apparatus including the zoom lens having the image stabilizing function according to any one of the first to sixth aspects.
【0020】[0020]
【発明の実施の形態】図1は本発明の防振機能を有した
ズームレンズの数値実施例1のレンズ断面図。
FIG. 1 is a sectional view of a numerical example 1 of a zoom lens having an image stabilizing function according to the present invention.
【0021】図2、図3、図4は数値実施例1の広角端、
中間、望遠端のズーム位置における収差図である。
FIGS. 2, 3 and 4 show the wide-angle end of the first numerical embodiment.
FIG. 7 is an aberration diagram at a zoom position at a middle or telephoto end.
【0022】図5は本発明の防振機能を有したズームレ
ンズの数値実施例2のレンズ断面図。
FIG. 5 is a lens cross-sectional view of a numerical example 2 of a zoom lens having an image stabilizing function according to the present invention.
【0023】図6、図7、図8は数値実施例2の広角端、
中間、望遠端のズーム位置における収差図である。
FIGS. 6, 7 and 8 show the wide-angle end of Numerical Embodiment 2,
FIG. 7 is an aberration diagram at a zoom position at a middle or telephoto end.
【0024】図9は本発明の防振機能を有したズームレ
ンズの数値実施例3のレンズ断面図。
FIG. 9 is a lens sectional view of a numerical example 3 of a zoom lens having an image stabilizing function according to the present invention.
【0025】図10、図11、図12は数値実施例3の広
角端、中間、望遠端のズーム位置における収差図である。
FIGS. 10, 11 and 12 are aberration diagrams of the numerical value example 3 at the wide-angle end, the middle position, and the telephoto end at the zoom positions.
【0026】レンズ断面図において(A),(B),
(C)は各々広角端、中間、望遠端を示している。収差図
において(a)はブレ補正前(偏心前)の無限遠物体撮
影状態での像高0の位置および15mm、−15mmの
位置での収差図であり、(b)は0.3°の結像位置ブ
レ補正時(偏心時)の無限遠物体撮影状態での像高0の
位置及び15mm,−15mmの位置である。
In the lens sectional views (A), (B),
(C) shows the wide-angle end, the middle, and the telephoto end, respectively. In the aberration diagrams, (a) is an aberration diagram at an image height 0 position and at 15 mm and -15 mm positions in an infinity object shooting state before blur correction (before eccentricity), and (b) is a diagram illustrating the aberration at 0.3 °. These are the position of image height 0 and the positions of 15 mm and -15 mm in the state of shooting an object at infinity at the time of image blur correction (eccentricity).
【0027】レンズ断面図においてL1は正の屈折力の
第1群、L2は負の屈折力の第2群、L3は正の屈折力の
第3群、L4は正の屈折力の第4群である。SPは開口
絞りであり、第3群L3の前方に配置している。IPは
像面であり、CCD等の撮像素子やフィルム等が配置さ
れている。
In the sectional view of the lens, L1 is a first lens unit having a positive refractive power, L2 is a second lens unit having a negative refractive power, L3 is a third lens unit having a positive refractive power, and L4 is a fourth lens unit having a positive refractive power. It is. SP denotes an aperture stop, which is arranged in front of the third lens unit L3. IP is an image plane, on which an image sensor such as a CCD, a film, and the like are arranged.
【0028】第3群L3は正の屈折力の第3p群L3p
と負の屈折力の単一レンズよりなる第3nレンズL3n
より成っている。第3nレンズL3nを光軸と垂直方向
に移動させてズームレンズが振動したときに生ずる画像
ブレを補正している。ALは非球面である。広角端から
望遠端への変倍に際して矢印のように各レンズ群を物体
側へ移動させている。変倍に際して絞りSPは第3群と
共に移動している。
The third lens unit L3 is a third lens unit L3p having a positive refractive power.
And a third lens L3n composed of a single lens having a negative refractive power
Consists of The image blur caused when the zoom lens vibrates by moving the third lens L3n in the direction perpendicular to the optical axis is corrected. AL is an aspheric surface. At the time of zooming from the wide-angle end to the telephoto end, each lens unit is moved to the object side as indicated by the arrow. During zooming, the stop SP moves together with the third lens unit.
【0029】本発明の防振機能を有したズームレンズで
は、物体側より順に、正の屈折力を有する第1レンズ群、
負の屈折力を有する第2レンズ群、開口絞り、正の屈折力
を有する第3レンズ群、正の屈折力を有する第4レンズ
群を有し、少なくとも該第1、第3、第4レンズ群が光軸
上を移動することで各レンズ群間の空気間隔を変化させ
て広角端から望遠端への変倍及び変倍による像面変動補
正を行っている。そして第3レンズ群中の最も像側の負
の屈折力の単レンズより成る第3nレンズL3nを光軸
に対し垂直方向に移動することによりズームレンズが振
動しブレが生じた際の結像位置(画像ブレ)の補正を行
っている。
In the zoom lens having an image stabilizing function according to the present invention, the first lens unit having a positive refractive power is arranged in order from the object side.
A second lens group having a negative refractive power, an aperture stop, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and at least the first, third, and fourth lenses By moving the groups on the optical axis, the air spacing between the lens groups is changed to perform magnification from the wide-angle end to the telephoto end and to correct the image plane fluctuation by zooming. Then, by moving the 3n lens L3n, which is a single lens having the negative refractive power closest to the image side in the third lens group, in the direction perpendicular to the optical axis, the zoom lens vibrates and the image forming position when blur occurs. (Image blur) is being corrected.
【0030】以上のような構成とすることで、変倍に際
して第1レンズ群と第2レンズ群の空気間隔を変化させ
ることにより主に第2レンズ群で変倍作用を担い、第3
レンズ群の移動で主に変倍に伴う像面変動の補正を行う
と同時に第3レンズ群と第4レンズ群の空気間隔を変化
させることにより変倍に伴う軸外収差の変動を補正して
いる。又この際、第2レンズ群を光軸上固定としても良
く、これによりズームレンズの変倍機構の簡略化が可能
となる。そして、正の屈折力を持つ前記第3レンズ群中
に負の屈折力を持つレンズ要素(第3nレンズ)を配置
することにより、第3レンズ群中の正の屈折作用の部分
で発生する諸収差をその負の屈折作用によりキャンセル
(補正)している。又、その負の屈折力のレンズ要素を
光軸に垂直方向に移動することで画像ぶれ補正を行う構
成にすることで、少ない移動量で大きい像位置の補正を
行うようにしている。同時に、絞り直後の正の屈折力を
持つ第3レンズ群中の最も像側の負の屈折力のレンズ要
素(第3nレンズ)を画像ぶれ補正レンズとすること
で、画像ぶれの補正レンズの小径化を容易としている。
With the above-described configuration, by changing the air gap between the first lens unit and the second lens unit during zooming, the second lens unit mainly performs the zooming operation, and
By correcting the image plane fluctuation mainly due to the zooming by moving the lens groups, and simultaneously changing the air gap between the third lens group and the fourth lens group to correct the fluctuation of the off-axis aberration due to the zooming. I have. In this case, the second lens group may be fixed on the optical axis, thereby simplifying the zooming mechanism of the zoom lens. By arranging a lens element having a negative refractive power (third n lens) in the third lens group having a positive refractive power, various elements generated in a portion of the third lens group having a positive refractive action are provided. The aberration is canceled (corrected) by its negative refraction. Further, the image blur correction is performed by moving the lens element having the negative refractive power in the direction perpendicular to the optical axis, so that a large image position can be corrected with a small moving amount. At the same time, the lens element having the negative refractive power closest to the image side (the third lens) in the third lens group having the positive refractive power immediately after the stop is used as the image blur correcting lens, thereby reducing the diameter of the image blur correcting lens. Is easy.
【0031】またさらに、その負の屈折力のレンズ要素
を1枚の単レンズで構成することにより、像位置補正の
ためのレンズ要素の小型軽量化を容易にし、移動機構の
簡易化及び駆動トルクの軽減化を容易にしている。
Further, by constituting the lens element having the negative refractive power with one single lens, it is easy to reduce the size and weight of the lens element for correcting the image position, and to simplify the moving mechanism and drive torque. Is easy to reduce.
【0032】以上のように本実施形態では撮影画像のブ
レを補正するために光軸に対し垂直方向に移動させる光
学系をズームレンズ中の比較的軽量な1枚の単レンズに
より構成することにより、簡単な構成と装置の小型化、
駆動手段の付加の軽減を図った防振機能を有したズーム
レンズ達成している。
As described above, in this embodiment, the optical system for moving in the direction perpendicular to the optical axis in order to correct the blur of the photographed image is constituted by one relatively light single lens in the zoom lens. , Simple configuration and miniaturization of equipment,
A zoom lens having an image stabilizing function in which the addition of a driving unit is reduced is achieved.
【0033】本発明の目的とする防振機能を有したズー
ムレンズは以上の諸条件を満足することにより達成され
るが、さらに良好なる光学性能を有しつつ、装置全体の
小型化を図るには次の諸条件のうち少なくとも1つを満
足させるのが良い。
The zoom lens having an anti-vibration function, which is the object of the present invention, can be achieved by satisfying the above conditions. However, it is necessary to reduce the size of the entire apparatus while having better optical performance. Preferably satisfies at least one of the following conditions.
【0034】(ア−1)前記第3nレンズの材質のアッ
ベ数をν3nとしたとき ν3n>45 ・・・(1) なる条件を満足することを特徴とすることである。
(A-1) When the Abbe number of the material of the third lens is ν3n, the following condition is satisfied: ν3n> 45 (1)
【0035】一般に本発明のように画像ぶれの発生時の
結像位置補正のために光学系の一部を平行偏心させる
と、偏心収差の一つである倍率色収差が発生する。その
ため、この時偏心させる画像ぶれ補正光学系は単体で色
補正されていることが望ましい。しかし、本発明のよう
に画像ぶれ補正光学系を単レンズで構成する場合は単体
の色消しは不可能なため、画像ぶれ補正時の色収差発生
を抑えるためには新たな条件が必要となる。
In general, when a part of the optical system is decentered in parallel for correcting an image forming position when an image blur occurs as in the present invention, chromatic aberration of magnification, which is one of the eccentric aberrations, occurs. Therefore, it is desirable that the image blur correction optical system decentered at this time is color-corrected by itself. However, when the image blur correction optical system is constituted by a single lens as in the present invention, it is impossible to achromatize a single lens. Therefore, a new condition is required to suppress the occurrence of chromatic aberration during image blur correction.
【0036】条件式(1)は、画像ブレ補正を行う際に
光軸に対し垂直に偏心させる第3nレンズの材質のアッ
ベ数を規定する条件式である。条件式(1)の範囲を超
えて第3nレンズの材質の分散が大きくなると、光学系
にブレが生じたときの結像位置の補正のため第3nレン
ズを偏心させた際に、偏心により発生する倍率色収差が
大きくなって補正困難となり、良好な画像が得られなく
なる。
Conditional expression (1) is a conditional expression that defines the Abbe number of the material of the third lens which is decentered perpendicularly to the optical axis when performing image blur correction. If the dispersion of the material of the 3n-th lens becomes large beyond the range of the conditional expression (1), the eccentricity occurs when the 3n-th lens is decentered for correcting the image forming position when the optical system is blurred. The chromatic aberration of magnification becomes large, making correction difficult, and a good image cannot be obtained.
【0037】尚、さらに好ましくは条件式(1)を ν3n>55 ・・・(1a) とするのが良い。It is more preferable that the conditional expression (1) is set to ν3n> 55 (1a).
【0038】(ア−2)前記第3nレンズの焦点距離を
f3n、前記第3レンズ群の焦点距離をf3、広角端に
おける全系の焦点距離をfw、望遠端における全系の焦
点距離をftとしたとき、 −3.5<f3n/f3<−1.5 ・・・(2)
(A-2) The focal length of the third lens unit is f3n, the focal length of the third lens unit is f3, the focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is ft. -3.5 <f3n / f3 <-1.5 (2)
【0039】[0039]
【数5】 (Equation 5)
【0040】なる条件を満足することを特徴とすること
である。
It is characterized by satisfying the following conditions.
【0041】条件式(2)、(3)は、画像ブレ補正を
行う際に光軸に対し垂直に偏心させる第3nレンズの屈
折力、及びその第3nレンズを含む第3レンズ群の屈折
力の比を規定する条件式である。
Conditional expressions (2) and (3) are the refractive power of the 3n lens which is decentered perpendicular to the optical axis when performing image blur correction, and the refractive power of the third lens group including the 3n lens. Is a conditional expression that defines the ratio of.
【0042】条件式(2)の上限を超え第3nレンズの
負の屈折力が強くなると、第3レンズ群中の第3nレン
ズ以外の正の屈折力の成分を強くしなければならなくな
り、高次の球面収差やコマ収差等が大きく発生して画像
ぶれ補正時の収差補正が困難となる。一方、条件式
(2)の下限を超え第3nレンズの負の屈折力が弱くな
ると、一定の結像位置補正を行うための第3nレンズの
光軸と垂直方向の移動量が大きくなるとともに、第3n
レンズの移動時(ぶれ補正時)の周辺光量確保のために
第3nレンズのレンズ径が増大するため、画像ぶれ補正
レンズの小型軽量化、及び補正機構の負荷軽減の観点か
ら望ましくない。
When the upper limit of conditional expression (2) is exceeded and the negative refractive power of the 3n-th lens becomes strong, the positive refractive power component other than the 3n-lens in the third lens group must be increased, and The following spherical aberration, coma aberration, and the like are greatly generated, and it becomes difficult to correct aberration at the time of image blur correction. On the other hand, when the negative refractive power of the 3n lens is weakened below the lower limit of the conditional expression (2), the amount of movement of the 3n lens in the direction perpendicular to the optical axis of the 3n lens for performing a constant image position correction increases, and 3n
Since the lens diameter of the 3nth lens increases in order to secure the peripheral light amount when the lens is moved (at the time of blur correction), it is not desirable from the viewpoint of reducing the size and weight of the image blur correction lens and reducing the load on the correction mechanism.
【0043】また、条件式(3)の上限を超えて第3レ
ンズ群の屈折力が弱まると一定の変倍比を確保するため
のレンズ群の移動量が大きくなり、その結果、レンズ全
長の増大を招き好ましくない。一方、下限を超えて第3
レンズ群の屈折力が強まると、第3レンズ群で発生する
収差を全変倍域で良好に補正することが困難になるため
望ましくない。
When the refractive power of the third lens unit is weakened beyond the upper limit of the conditional expression (3), the amount of movement of the lens unit for securing a constant zoom ratio becomes large. It is not preferable because it increases. On the other hand, the third
If the refractive power of the lens group is increased, it becomes difficult to satisfactorily correct aberrations generated in the third lens group in the entire zoom range, which is not desirable.
【0044】尚、さらに好ましくは条件式(2)、
(3)を −3.0<f3n/f3<−2.0 ・・・(2a)
It is more preferable that conditional expression (2) be satisfied.
(3) is -3.0 <f3n / f3 <-2.0 (2a)
【0045】[0045]
【数6】 (Equation 6)
【0046】とするのが良い。It is preferable that
【0047】(ア−3)第iレンズ群の焦点距離をf
i、広角端における全系の焦点距離をfw、望遠端にお
ける全系の焦点距離をftとしたとき
(A-3) The focal length of the i-th lens group is f
i, when the focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is ft
【0048】[0048]
【数7】 (Equation 7)
【0049】なる条件を満足することを特徴とすること
である。
It is characterized by satisfying the following conditions.
【0050】条件式(4)、(5)、(6)は主にコン
パクトで高画質なズームレンズを実現するための各レン
ズ群の屈折力を規定する条件式である。
The conditional expressions (4), (5) and (6) are mainly conditional expressions for defining the refractive power of each lens unit for realizing a compact and high-quality zoom lens.
【0051】条件式(4)の上限を超え第1レンズ群の
屈折力が弱くなると、レンズ外径が増大またはレンズ全
長が増大し好ましくない。また下限を超え第1レンズ群
の屈折力が強くなると、高次の球面収差が大きく発生し
補正が困難となる。
If the upper limit of conditional expression (4) is exceeded and the refractive power of the first lens unit becomes weak, the outer diameter of the lens increases or the overall length of the lens undesirably increases. If the refractive power of the first lens unit exceeds the lower limit and the refractive power of the first lens unit becomes strong, a high-order spherical aberration will occur greatly, making it difficult to correct.
【0052】条件式(5)の上限を超え第2レンズ群の
負の屈折力が強くなると、ペッツバール和が負の方向に
大きくなり過ぎ、像面湾曲が大きくなり好ましくない。
また下限を超え第2レンズ群の負の屈折力が小さくなる
と、一定の変倍比を確保するための各レンズ群の移動量
が大きくなりレンズ全系のコンパクト化が困難となる。
If the negative refractive power of the second lens unit exceeds the upper limit of conditional expression (5), the Petzval sum becomes too large in the negative direction, and the field curvature becomes undesirably large.
If the negative refractive power of the second lens unit is smaller than the lower limit, the amount of movement of each lens unit for securing a constant zoom ratio becomes large, and it becomes difficult to make the entire lens system compact.
【0053】条件式(6)の上限を超え第4レンズ群の
屈折力が弱くなると、バックフォーカスが長くなりレン
ズ全系のコンパクト化が困難となる。また下限を超え第
4レンズ群の屈折力が強くなると、像面湾曲等軸外の高
次収差が大きく発生し補正が困難となる。
If the upper limit of conditional expression (6) is exceeded and the refractive power of the fourth lens unit becomes weak, the back focus becomes long, and it becomes difficult to make the entire lens system compact. If the refractive power of the fourth lens unit exceeds the lower limit and the refractive power of the fourth lens unit becomes strong, large off-axis high-order aberrations such as curvature of field will be generated, and correction will be difficult.
【0054】尚、さらに好ましくは条件式(4)、
(5)、(6)を
More preferably, conditional expression (4),
(5), (6)
【0055】[0055]
【数8】 (Equation 8)
【0056】とするのが良い。It is preferable that
【0057】(ア−4)前記第2レンズ群は、その最も
物体側のレンズ面に、光軸に対して回転対称な非球面を
有することを特徴とすることである。
(A-4) The second lens group is characterized in that the lens surface closest to the object has an aspherical surface which is rotationally symmetric with respect to the optical axis.
【0058】本発明のズームレンズにおいては非球面を
効果的に配置するのが良く、これによれば全体として少
ない構成枚数で優れた光学性能を維持した変倍光学系を
達成することが容易となる。
In the zoom lens according to the present invention, it is preferable to effectively arrange the aspherical surfaces. This makes it easy to achieve a variable power optical system that maintains excellent optical performance with a small number of components as a whole. Become.
【0059】具体的には、変倍負担を大きく持っている
第2レンズ群の最も物体側のレンズ面に適切な非球面を
配置することで、変倍時に発生する諸収差を良好に補正
するとともに構成枚数を減らすことができる。
Specifically, by arranging an appropriate aspherical surface on the lens surface closest to the object in the second lens unit having a large variable load, various aberrations generated at the time of variable power can be satisfactorily corrected. In addition, the number of components can be reduced.
【0060】(ア−5)前記第4レンズ群は少なくとも
1面に、光軸に対して回転対称な非球面を有することを
特徴とすることである。第4群の負の屈折力を持つレン
ズの1面に適切な非球面を配置することで、やはり変倍
時の軸外収差の変動を良好に補正し、構成枚数を少なく
することができる。
(A-5) The fourth lens group is characterized in that at least one surface has an aspherical surface rotationally symmetric with respect to the optical axis. By arranging an appropriate aspherical surface on one surface of the fourth group of lenses having a negative refractive power, the variation of off-axis aberration at the time of zooming can be corrected well, and the number of components can be reduced.
【0061】以上説明したように、本発明の各実施形態
によれば、撮影画像のブレを補正するために光軸に対し
垂直方向に偏心させる光学系をズームレンズ中の比較的
軽量な1枚の単レンズにより構成することにより、簡単
な構成と装置の小型化、駆動手段の負荷の軽減を図った
防振機能を有したズームレンズが実現している。
As described above, according to each embodiment of the present invention, an optical system for decentering in the vertical direction with respect to the optical axis in order to correct blurring of a photographed image is a relatively lightweight one in a zoom lens. Thus, a zoom lens having an anti-vibration function that realizes a simple configuration, miniaturization of the apparatus, and reduction of the load on the driving means is realized.
【0062】また同時に、ズームレンズのレンズ構成を
適切に構成することにより、構成枚数の少ない簡単な構
成でコンパクトな防振機能を有したズームレンズを実現
している。
At the same time, by appropriately configuring the lens configuration of the zoom lens, a zoom lens having a simple configuration with a small number of components and having a compact image stabilizing function is realized.
【0063】次に本発明の防振機能を有したズームレン
ズを用いたビデオカメラ(・光学機器)の実施形態を図
13を用いて説明する。
Next, an embodiment of a video camera (optical apparatus) using a zoom lens having an image stabilizing function according to the present invention will be described with reference to FIG.
【0064】図13において、10はビデオカメラ本
体、11は本発明のズームレンズによって構成された撮
影光学系、12は撮影光学系11によって被写体像を受
光するCCD等の撮像素子、13は撮像素子12が受光
した被写体像を記録する記録手段、14は不図示の表示
素子に表示された被写体像を観察するためのファインダ
ーである。上記表示素子は液晶パネル等によって構成さ
れ、撮像素子12上に形成された被写体像が表示され
る。
In FIG. 13, reference numeral 10 denotes a video camera main body, 11 denotes a photographing optical system constituted by the zoom lens of the present invention, 12 denotes an image pickup device such as a CCD for receiving a subject image by the photographing optical system 11, and 13 denotes an image pickup device. Reference numeral 12 denotes a recording unit for recording the received subject image, and reference numeral 14 denotes a finder for observing the subject image displayed on a display element (not shown). The display element includes a liquid crystal panel or the like, and displays a subject image formed on the image sensor 12.
【0065】このように本発明のズームレンズをビデオ
カメラやデジタルスチルカメラ等の電子カメラに適用す
ることにより、小型で高い光学性能を有する光学機器を
実現している。
As described above, by applying the zoom lens of the present invention to an electronic camera such as a video camera and a digital still camera, an optical device having a small size and high optical performance is realized.
【0066】以下に、本発明によるズームレンズの数値
実施例1〜3の数値データを示す。
Hereinafter, numerical data of numerical examples 1 to 3 of the zoom lens according to the present invention will be described.
【0067】これらの数値実施例において、riは物体
側から順に第i番目の面の曲率半径、diは物体側から
順に第i番目の光学部材厚又は空気間隔、niとνiは
それぞれ物体側から順に第i番目の光学部材の材質のd
線における屈折率とアッベ数である。
In these numerical examples, ri is the radius of curvature of the i-th surface in order from the object side, di is the thickness of the i-th optical member or air gap in order from the object side, and ni and νi are respectively from the object side. The d of the material of the i-th optical member in order
The refractive index and Abbe number of the line.
【0068】また、各数値実施例においてALで示す面
は非球面であり、その形状は次式によって定義してい
る。
In each numerical example, the surface indicated by AL is an aspherical surface, and the shape is defined by the following equation.
【0069】[0069]
【数9】 (Equation 9)
【0070】ここでXは光軸からhだけ離れたレンズ面
上の光軸方向への変位量、Rは曲率半径、B,C,D,
Eはそれぞれ4次、6次、8次、10次の非球面係数で
ある。
Here, X is the amount of displacement in the direction of the optical axis on the lens surface away from the optical axis by h, R is the radius of curvature, B, C, D,
E is a fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficient, respectively.
【0071】また、各数値実施例の数値条件式に対応す
る数値も示す。
Further, numerical values corresponding to the numerical conditional expressions in each numerical example are also shown.
【0072】[0072]
【外1】 [Outside 1]
【0073】[0073]
【外2】 [Outside 2]
【0074】[0074]
【外3】 [Outside 3]
【0075】[0075]
【発明の効果】本発明によれば前述の如くズームレンズ
の一部を構成する比較的小型軽量のレンズを光軸と垂直
方向に移動させて、ズームレンズが振動(傾動)したと
きの画像のブレを補正することにより、装置全体の小型
化、機構上の簡素化及び駆動手段の負荷の軽減化を図り
つつ画像ぶれを効果的に補正することができるズームレ
ンズ及びそれを用いた光学機器を達成することができ
る。
According to the present invention, as described above, the relatively small and light lens constituting a part of the zoom lens is moved in the direction perpendicular to the optical axis, and the image when the zoom lens vibrates (tilts). A zoom lens and an optical apparatus using the zoom lens that can effectively correct image blur while reducing the size of the entire apparatus, simplifying the mechanism, and reducing the load on the driving unit by correcting the blur. Can be achieved.
【図面の簡単な説明】[Brief description of the drawings]
【図1】 本発明の数値実施例1のレンズ断面図。FIG. 1 is a lens cross-sectional view of Numerical Example 1 of the present invention.
【図2】 本発明の数値実施例1のズームレンズの広角
端における基準状態及びブレ補正時の横収差図。
FIG. 2 is a lateral aberration diagram of a zoom lens according to a numerical example 1 of the present invention in a reference state at a wide-angle end and during blur correction.
【図3】 本発明の数値実施例1のズームレンズの中間
における基準状態及びブレ補正時の横収差図。レンズ断
面図。
FIG. 3 is a lateral aberration diagram in a reference state and a blur correction at the middle of the zoom lens according to Numerical Example 1 of the present invention. FIG.
【図4】 本発明の数値実施例1のズームレンズの望遠
端における基準状態及びブレ補正時の横収差図。
FIG. 4 is a lateral aberration diagram at the telephoto end of the zoom lens according to Numerical Example 1 of the present invention at the telephoto end and during blur correction.
【図5】 本発明の数値実施例2のレンズ断面図。FIG. 5 is a lens sectional view of a numerical example 2 of the present invention.
【図6】 本発明の数値実施例2のズームレンズの広角
端における基準状態及びブレ補正時の横収差図。
FIG. 6 is a lateral aberration diagram of a zoom lens according to a second numerical example of the present invention at the wide-angle end in a reference state and at the time of blur correction.
【図7】 本発明の数値実施例2のズームレンズの中間
における基準状態及びブレ補正時の横収差図。
FIG. 7 is a lateral aberration diagram in a reference state and blur correction in the middle of a zoom lens according to Numerical Example 2 of the present invention.
【図8】 本発明の数値実施例2のズームレンズの望遠
端における基準状態及びブレ補正時の横収差図。
FIG. 8 is a lateral aberration diagram at the telephoto end of the zoom lens according to Numerical Example 2 of the present invention at the telephoto end and during blur correction.
【図9】 本発明の数値実施例3のレンズ断面図。FIG. 9 is a lens cross-sectional view of Numerical Example 3 of the present invention.
【図10】 本発明の数値実施例3のズームレンズの広
角端における基準状態及びブレ補正時の横収差図。
FIG. 10 is a lateral aberration diagram of a zoom lens according to a third numerical example of the present invention at the wide-angle end in a reference state and at the time of blur correction.
【図11】 本発明の数値実施例3のズームレンズの中
間における基準状態及びブレ補正時の横収差図。レンズ
断面図。
FIG. 11 is a lateral aberration diagram at the time of a blur correction in a reference state in the middle of a zoom lens according to Numerical Example 3 of the present invention. FIG.
【図12】 本発明の数値実施例3のズームレンズの望
遠端における基準状態及びブレ補正時の横収差図。
FIG. 12 is a lateral aberration diagram at the telephoto end of the zoom lens according to Numerical Example 3 of the present invention at the telephoto end and during blur correction.
【図13】 本発明の光学機器の要部概略図。FIG. 13 is a schematic view of a main part of an optical apparatus according to the invention.
【符号の説明】[Explanation of symbols]
L1 第1群 L2 第2群 L3 第3群 L4 第4群 SP 絞り IP 像面 d d線 g g線 ΔS サジタル像面 ΔM メリディオナル像面 AL 非球面 L1 First lens unit L2 Second lens unit L3 Third lens unit L4 Fourth lens unit SP Aperture IP Image plane d d line g g line ΔS Sagittal image plane ΔM Meridional image plane AL Aspherical surface
フロントページの続き Fターム(参考) 2H087 KA02 KA03 NA07 PA06 PA10 PA20 PB11 QA02 QA06 QA17 QA21 QA26 QA39 QA41 QA46 RA05 RA12 RA13 RA36 SA23 SA27 SA29 SA32 SA62 SA64 SA65 SA73 SB03 SB15 SB24 SB33 Continued on the front page F term (reference) 2H087 KA02 KA03 NA07 PA06 PA10 PA20 PB11 QA02 QA06 QA17 QA21 QA26 QA39 QA41 QA46 RA05 RA12 RA13 RA36 SA23 SA27 SA29 SA32 SA62 SA64 SA65 SA73 SB03 SB15 SB24 SB33

Claims (7)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 物体側より順に、正の屈折力を有する第
    1レンズ群、負の屈折力を有する第2レンズ群、開口絞
    り、正の屈折力を有する第3レンズ群、正の屈折力を有
    する第4レンズ群を有し、広角端から望遠端への変倍時
    には、少なくとも該第1、第3、第4レンズ群が光軸上
    を移動することで各レンズ群間の空気間隔を変化させる
    ズームレンズであって該第3レンズ群は最も像側に負の
    屈折力の単レンズより成る第3nレンズを有し、該第3
    nレンズを光軸に対し垂直方向に移動することにより該
    ズームレンズが振動したときに生ずる画像ブレの補正を
    行うことを特徴とする防振機能を有したズームレンズ。
    1. An object having a positive refractive power in order from the object side.
    It has one lens group, a second lens group having a negative refractive power, an aperture stop, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. At the time of zooming, at least the first, third and fourth lens groups move on the optical axis to change the air gap between the lens groups, and the third lens group is closest to the image side. A third n-th lens made of a single lens having a negative refractive power;
    A zoom lens having an image stabilizing function, wherein an image blur caused when the zoom lens vibrates is corrected by moving an n lens in a direction perpendicular to an optical axis.
  2. 【請求項2】 前記第3nレンズの材質のアッベ数をν
    3nとしたとき ν3n>45 なる条件を満足することを特徴とする請求項1に記載の
    防振機能を有したズームレンズ。
    2. The Abbe number of the material of the third n lens is ν.
    2. The zoom lens having an anti-vibration function according to claim 1, wherein a condition of ν3n> 45 is satisfied when 3n is set.
  3. 【請求項3】 前記第3nレンズの焦点距離をf3n、
    前記第3レンズ群の焦点距離をf3、広角端における全
    系の焦点距離をfw、望遠端における全系の焦点距離を
    ftとしたとき、 −3.5<f3n/f3<−1.5 【数1】 なる条件を満足することを特徴とする請求項1又は2の
    防振機能を有したズームレンズ。
    3. The focal length of the 3n lens is f3n,
    When the focal length of the third lens group is f3, the focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is ft, -3.5 <f3n / f3 <-1.5 Equation 1 3. The zoom lens having an anti-vibration function according to claim 1, wherein the following condition is satisfied.
  4. 【請求項4】 第iレンズ群の焦点距離をfi、広角端
    における全系の焦点距離をfw、望遠端における全系の
    焦点距離をftとしたとき 【数2】 なる条件を満足することを特徴とする請求項1、2又は
    3の防振機能を有したズームレンズ。
    4. When the focal length of the i-th lens unit is fi, the focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is ft. 4. The zoom lens having an image stabilizing function according to claim 1, wherein the zoom lens satisfies the following conditions.
  5. 【請求項5】 前記第2レンズ群は、その最も物体側の
    レンズ面に、光軸に対して回転対称な非球面を有するこ
    とを特徴とする請求項1から4のいずれか1項の防振機
    能を有したズームレンズ。
    5. The protection according to claim 1, wherein the second lens group has an aspherical surface rotationally symmetric with respect to an optical axis on a lens surface closest to the object. Zoom lens with vibration function.
  6. 【請求項6】 前記第4レンズ群は少なくとも1面に、
    光軸に対して回転対称な非球面を有することを特徴とす
    る請求項1から5のいずれか1項の防振機能を有したズ
    ームレンズ。
    6. The fourth lens group has at least one surface,
    6. The zoom lens having an image stabilizing function according to claim 1, wherein the zoom lens has an aspherical surface that is rotationally symmetric with respect to the optical axis.
  7. 【請求項7】 請求項1から6のいずれか1項の防振機
    能を有したズームレンズを有していることを特徴とする
    光学機器。
    7. An optical apparatus comprising the zoom lens having the image stabilizing function according to claim 1. Description:
JP2000187649A 2000-06-22 2000-06-22 Zoom lens and optical apparatus having the same Expired - Fee Related JP4630424B2 (en)

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JP2005331628A (en) * 2004-05-19 2005-12-02 Olympus Corp Zoom optical system and imaging device using it
EP1643293A1 (en) 2004-10-01 2006-04-05 Nikon Corporation Zoom lens system with vibration reduction
JP2007256452A (en) * 2006-03-22 2007-10-04 Olympus Imaging Corp Zoom lens and imaging apparatus using the same
JP2008026558A (en) * 2006-07-20 2008-02-07 Nikon Corp Zoom lens, imaging apparatus, vibration prevention method for zoom lens and variable power method for zoom lens
US7492524B2 (en) 2006-07-20 2009-02-17 Nikon Corporation Zoom lens system, imaging apparatus, method for vibration reduction, and method for varying focal length
US7609456B2 (en) 2006-12-18 2009-10-27 Hoya Corporation Standard zoom lens system
JP2011128229A (en) * 2009-12-15 2011-06-30 Ricoh Co Ltd Zoom lens and information apparatus with photographing function
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JP2012133116A (en) * 2010-12-21 2012-07-12 Nikon Corp Zoom lens, optical equipment loaded with zoom lens and manufacturing method for zoom lens
JP2014044243A (en) * 2012-08-24 2014-03-13 Sigma Corp Zoom lens system
US8873161B2 (en) 2009-12-15 2014-10-28 Ricoh Company, Ltd. Zoom lens, camera apparatus, information device and mobile information terminal apparatus
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JPH10232420A (en) * 1997-02-20 1998-09-02 Matsushita Electric Ind Co Ltd Zoom lens
JP2000075204A (en) * 1998-06-16 2000-03-14 Asahi Optical Co Ltd Zoom lens system

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JPH08220439A (en) * 1995-02-17 1996-08-30 Olympus Optical Co Ltd Zoom lens
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US7609456B2 (en) 2006-12-18 2009-10-27 Hoya Corporation Standard zoom lens system
US8873161B2 (en) 2009-12-15 2014-10-28 Ricoh Company, Ltd. Zoom lens, camera apparatus, information device and mobile information terminal apparatus
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