JP4635688B2 - Zoom lens with anti-vibration function - Google Patents

Zoom lens with anti-vibration function Download PDF

Info

Publication number
JP4635688B2
JP4635688B2 JP2005102731A JP2005102731A JP4635688B2 JP 4635688 B2 JP4635688 B2 JP 4635688B2 JP 2005102731 A JP2005102731 A JP 2005102731A JP 2005102731 A JP2005102731 A JP 2005102731A JP 4635688 B2 JP4635688 B2 JP 4635688B2
Authority
JP
Japan
Prior art keywords
lens
group
lens group
zoom lens
end state
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.)
Active
Application number
JP2005102731A
Other languages
Japanese (ja)
Other versions
JP2006284763A (en
JP2006284763A5 (en
Inventor
剛司 鈴木
敦史 芝山
智希 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
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 Nikon Corp filed Critical Nikon Corp
Priority to JP2005102731A priority Critical patent/JP4635688B2/en
Priority to US11/237,743 priority patent/US7253965B2/en
Priority to EP10182069.4A priority patent/EP2325688B1/en
Priority to EP18191670.1A priority patent/EP3444654A3/en
Priority to EP05256159.4A priority patent/EP1643293B1/en
Priority to EP10182297.1A priority patent/EP2325680B1/en
Publication of JP2006284763A publication Critical patent/JP2006284763A/en
Publication of JP2006284763A5 publication Critical patent/JP2006284763A5/ja
Application granted granted Critical
Publication of JP4635688B2 publication Critical patent/JP4635688B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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 +-++

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Adjustment Of Camera Lenses (AREA)

Description

本発明は、防振機能を有するズームレンズに関する。   The present invention relates to a zoom lens having an anti-vibration function.

従来、防振機能を有するズームレンズが提案されている(例えば、特許文献1,2を参照。)。
特開2003-140048号公報 特開2003-295060号公報
Conventionally, zoom lenses having an anti-vibration function have been proposed (see, for example, Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 2003-140048 Japanese Patent Laid-Open No. 2003-295060

しかしながら上記特許文献1に開示されているズームレンズは変倍比が7倍以下であり、高変倍化の要求に十分応えることができない。
また、上記特許文献2に開示されているズームレンズは広角端状態におけるバックフォーカスが広角端状態における焦点距離の1.7倍以下である。したがってこのようなズームレンズを、長いバックフォーカスを必要とする一眼レフカメラ、特に35mm判(画像サイズ36mm×26mm)よりも画像サイズの小さい固体撮像素子を用いて、35mm判一眼レフカメラと同等のバックフォーカスを必要とするデジタル一眼レフカメラに利用しようとすると、十分に大きな画角を得ることができない、又は一眼レフカメラのミラーにレンズ後部が干渉するという問題が生じてしまう。
However, the zoom lens disclosed in Patent Document 1 has a zoom ratio of 7 times or less and cannot sufficiently meet the demand for high zoom ratio.
In the zoom lens disclosed in Patent Document 2, the back focus in the wide-angle end state is 1.7 times or less than the focal length in the wide-angle end state. Therefore, such a zoom lens is equivalent to a single-lens reflex camera requiring a long back focus, particularly a 35 mm single-lens reflex camera using a solid-state imaging device having a smaller image size than a 35 mm size (image size 36 mm × 26 mm). If it is intended to be used in a digital single-lens reflex camera that requires back focus, a problem that a sufficiently large angle of view cannot be obtained or the rear part of the lens interferes with the mirror of the single-lens reflex camera occurs.

そこで本発明は上記問題点に鑑みてなされたものであり、防振機能を有するズームレンズであって、デジタル一眼レフカメラに好適な長いバックフォーカスと、10倍程度のズーム比を有し、さらに広角端状態において70°以上の画角を有する小型のズームレンズを提供することを目的とする。   Therefore, the present invention has been made in view of the above problems, and is a zoom lens having an anti-vibration function, which has a long back focus suitable for a digital single lens reflex camera and a zoom ratio of about 10 times. An object is to provide a small zoom lens having an angle of view of 70 ° or more in the wide-angle end state.

上記課題を解決するために本発明は、
物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とからなり、前記レンズ群どうしの間隔を変化させて変倍を行うズームレンズにおいて、
前記第3レンズ群は、物体側から順に、正の屈折力を有する前群と、負の屈折力を有する後群とからなり、
前記後群のみを光軸と直交する方向へ移動させることによって結像位置の変位を補正し、
前記後群は、両凹形状の負レンズと正メニスカスレンズとの接合レンズからなり、
前記後群中の少なくとも一つのレンズ面は、近軸曲率半径を有する球面に比して、光軸から周辺へ向かって正の屈折力が強くなる又は負の屈折力が弱くなる形状の非球面であり、
以下の条件式(1),(6)を満足することを特徴とする防振機能を有するズームレンズを提供する。
(1) 3.7 < f1/fw < 7.0
(6) −2.3 < f3R/f3F < −1.2
ただし、
f1:前記第1レンズ群の焦点距離
fw:広角端状態における前記ズームレンズの焦点距離
f3F:前記前群の焦点距離
f3R:前記後群の焦点距離
In order to solve the above problems, the present invention
In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power consists of a group, in changing the interval between the lens group zoom lens to perform zooming,
The third lens group includes, in order from the object side, a front group having a positive refractive power and a rear group having a negative refractive power,
Correct the displacement of the imaging position by moving only the rear group in the direction perpendicular to the optical axis,
The rear group consists of a cemented lens of a biconcave negative lens and a positive meniscus lens,
At least one lens surface in the rear group has an aspherical surface in which the positive refractive power increases toward the periphery from the optical axis or the negative refractive power decreases as compared with a spherical surface having a paraxial radius of curvature. And
Provided is a zoom lens having an anti-vibration function characterized by satisfying the following conditional expressions (1) and (6) .
(1) 3.7 <f1 / fw <7.0
(6) -2.3 <f3R / f3F <-1.2
However,
f1: Focal length fw of the first lens group fw: Focal length of the zoom lens in the wide-angle end state
f3F: Focal length of the front group
f3R: focal length of the rear group

また本発明の防振機能を有するズームレンズは、
以下の条件式(2)を満足することが望ましい。
(2) 1.6 < f3/fw < 3.
だし、
f3 :前記第3レンズ群の焦点距
また本発明の防振機能を有するズームレンズは、
以下の条件式(3),(4),(5)を満足することが望ましい。
(3) 0.0001×(h/2) < |X50| < 0.01×(h/2)
(4) 0.0001×(h/2) < |Xm| < 0.01×(h/2)
(5) |X50|/|Xm| < 1
ただし、
h :前記非球面の有効径
X50:前記非球面の光軸から有効径5割の高さにおける近軸曲率半径と非球面形状との偏差量
Xm :前記非球面の光軸から有効径10割の高さにおける近軸曲率半径と非球面形状との偏差量
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable to satisfy the following conditional expression (2 ) .
(2) 1.6 <f3 / fw <3. 5
However it was,
f3: focal length of the third lens group
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable to satisfy the following conditional expressions (3), (4) and (5).
(3) 0.0001 × (h / 2) <| X50 | <0.01 × (h / 2)
(4) 0.0001 × (h / 2) <| Xm | <0.01 × (h / 2)
(5) | X50 | / | Xm | <1
However,
h: Effective diameter of the aspheric surface
X50: Deviation amount between the paraxial radius of curvature and the aspherical shape at an effective diameter of 50% from the aspherical optical axis
Xm: Deviation amount between the paraxial radius of curvature and the aspherical shape at an effective diameter of 100% from the aspherical optical axis

また本発明の防振機能を有するズームレンズは、
前記第4レンズ群中の最も物体側のレンズは正レンズであり、当該正レンズの像側レンズ面は像側に凸形状であることが望ましい。
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable that the most object side lens in the fourth lens group is a positive lens, and the image side lens surface of the positive lens has a convex shape on the image side.

また本発明の防振機能を有するズームレンズは、
広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第3レンズ群と前記第4レンズ群とが物体側へ移動することが望ましい。
In addition, the zoom lens having the image stabilization function of the present invention is
In zooming from the wide-angle end state to the telephoto end state, it is desirable that the first lens group, the third lens group, and the fourth lens group move toward the object side.

また本発明の防振機能を有するズームレンズは、
広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔が、望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔よりも大きいことが望ましい。
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable that an air gap between the third lens group and the fourth lens group in the wide-angle end state is larger than an air gap between the third lens group and the fourth lens group in the telephoto end state.

また本発明の防振機能を有するズームレンズは、
以下の条件式(7)を満足することが望ましい。
(7) 0.90 < f3/f4 < 1.6
だし、
f4 :前記第4レンズ群の焦点距
また本発明の防振機能を有するズームレンズは、
以下の条件式(8)を満足することが望ましい。
(8) 1.80 < Bfw/fw < 3.00
ただし、
Bfw:広角端状態におけるバックフォーカス
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable to satisfy the following conditional expression (7) .
(7) 0.90 <f3 / f4 <1.6 0
However it was,
f4: focal length of the fourth lens group
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable to satisfy the following conditional expression (8).
(8) 1.80 <Bfw / fw <3.00
However,
Bfw: Back focus in the wide-angle end state

また本発明の防振機能を有するズームレンズは、
以下の条件式を満足することが望ましい。
(10) −0.90 < fw/Re < 0.20
ただし、
Re:前記ズームレンズ中の最も像側のレンズ面の曲率半径
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable to satisfy the following conditional expression.
(10) -0.90 <fw / Re <0.20
However,
Re: radius of curvature of the lens surface closest to the image side in the zoom lens

また本発明の防振機能を有するズームレンズは、
前記後群中の最も物体側のレンズ面は像側に凸形状であることが望ましい。
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable that the lens surface closest to the object in the rear group is convex on the image side.

また本発明の防振機能を有するズームレンズは、
前記第4レンズ群における最も物体側のレンズは、少なくとも1つのレンズ面が非球面である両凸形状の正レンズであることが望ましい。
In addition, the zoom lens having the image stabilization function of the present invention is
The most object side lens in the fourth lens group is preferably a biconvex positive lens having at least one aspheric surface.

また本発明の防振機能を有するズームレンズは、
前記第4レンズ群は少なくとも1つの接合レンズを有し、当該接合レンズの接合面は像側に凸形状であることが望ましい
た本発明の防振機能を有するズームレンズは、
遠距離から近距離へのフォーカシングは、前記第2レンズ群を物体側へ移動させることによって行われることが望ましい。
また本発明の防振機能を有するズームレンズは、
少なくとも1つの非球面を有する非球面レンズを3枚有することが望ましい。
また本発明は、
物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とからなるズームレンズの変倍方法であって
前記第3レンズ群は、物体側から順に、正の屈折力を有する前群と、負の屈折力を有する後群とからなり
前記後群は、両凹形状の負レンズと正メニスカスレンズとの接合レンズからなり、
前記後群中の少なくとも1つのレンズ面は、近軸曲率半径を有する球面に比して、光軸から周辺へ向かって正の屈折力が強くなる又は負の屈折力が弱くなる形状の非球面であり、
前記後群を光軸と直交する方向へ移動させることによって結像位置の変位を補正し、
以下の条件式(1),(6)を満足することを特徴とするズームレンズの変倍方法を提供する。
(1) 3.7 < f1/fw < 7.0
(6) −2.3 < f3R/f3F < −1.2
ただし、
f1:前記第1レンズ群の焦点距離
fw:広角端状態における前記ズームレンズの焦点距離
f3F:前記前群の焦点距離
f3R:前記後群の焦点距離
また本発明のズームレンズの変倍方法は、
広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第2レンズ群との空気間隔が増大し、前記第2レンズ群と前記第3レンズ群との空気間隔が減少し、前記第3レンズ群と前記第4レンズ群との空気間隔が減少することが望ましい。
また本発明のズームレンズの変倍方法は、
広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第3レンズ群と前記第4レンズ群とが物体側へ移動することが望ましい。
また本発明のズームレンズの変倍方法は、
前記第2レンズ群と前記第3レンズ群との間に可変開口絞りを配置し、
広角端状態から望遠端状態への変倍に際し、前記可変開口絞りは前記前群とともに移動することが望ましい。
Further, the zoom lens having the image stabilization function of the present invention is
It is desirable that the fourth lens group has at least one cemented lens, and the cemented surface of the cemented lens has a convex shape on the image side .
A zoom lens having a vibration proof function of or the invention,
It is desirable that focusing from a long distance to a short distance is performed by moving the second lens group to the object side.
In addition, the zoom lens having the image stabilization function of the present invention is
It is desirable to have three aspheric lenses having at least one aspheric surface.
The present invention also provides
In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power A zooming method of a zoom lens comprising a group,
The third lens group includes, in order from the object, a front group having positive refractive power, and a rear group having negative refractive power,
The rear group consists of a cemented lens of a biconcave negative lens and a positive meniscus lens,
At least one lens surface in the rear group has an aspherical shape in which the positive refractive power increases toward the periphery from the optical axis or the negative refractive power decreases as compared with a spherical surface having a paraxial radius of curvature. And
The displacement of the imaging position is corrected by moving the rear group in a direction perpendicular to the optical axis,
A zoom lens zooming method characterized by satisfying the following conditional expressions (1) and (6) is provided.
(1) 3.7 <f1 / fw <7.0
(6) -2.3 <f3R / f3F <-1.2
However,
f1: Focal length fw of the first lens group fw: Focal length of the zoom lens in the wide-angle end state
f3F: Focal length of the front group
f3R: the focal length of the rear group or the zooming method of the zoom lens according to the present invention,
During zooming from the wide-angle end state to the telephoto end state, the air gap between the first lens group and the second lens group increases, and the air gap between the second lens group and the third lens group decreases. It is preferable that an air gap between the third lens group and the fourth lens group is reduced.
The zoom lens zooming method of the present invention includes:
In zooming from the wide-angle end state to the telephoto end state, it is desirable that the first lens group, the third lens group, and the fourth lens group move toward the object side.
The zoom lens zooming method of the present invention includes:
A variable aperture stop is disposed between the second lens group and the third lens group;
In zooming from the wide-angle end state to the telephoto end state, it is desirable that the variable aperture stop moves with the front group.

本発明によれば、防振機能を有するズームレンズであって、デジタル一眼レフカメラに好適な長いバックフォーカスと、10倍程度のズーム比を有し、さらに広角端状態において70°以上の画角を有する小型のズームレンズを提供することができる。   According to the present invention, the zoom lens has an anti-vibration function, has a long back focus suitable for a digital single-lens reflex camera, a zoom ratio of about 10 times, and an angle of view of 70 ° or more in the wide-angle end state. It is possible to provide a small zoom lens having

本発明の防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とを有し、前記レンズ群どうしの間隔を変化させて変倍を行うズームレンズである。そして本発明の防振機能を有するズームレンズは、前記第3レンズ群が、物体側から順に、正の屈折力を有する前群と、負の屈折力を有する後群とからなり、前記後群のみを光軸と直交する方向へ移動させることによって結像位置の変位を補正し、前記後群中の少なくとも一つのレンズ面は、近軸曲率半径を有する球面に比して、光軸から周辺へ向かって正の屈折力が強くなる又は負の屈折力が弱くなる形状の非球面であり、以下の条件式(1)を満足するように構成されている。
(1) 3.7 < f1/fw < 7.0
ただし、
f1:前記第1レンズ群の焦点距離
fw:広角端状態における前記ズームレンズの焦点距離
The zoom lens having an image stabilization function according to the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power. The zoom lens includes a group and a fourth lens group having a positive refractive power, and performs zooming by changing an interval between the lens groups. In the zoom lens having an anti-vibration function of the present invention, the third lens group includes, in order from the object side, a front group having a positive refractive power and a rear group having a negative refractive power. The displacement of the imaging position is corrected by moving only in the direction orthogonal to the optical axis, and at least one lens surface in the rear group is peripheral from the optical axis as compared to a spherical surface having a paraxial radius of curvature. The aspherical surface has a shape in which the positive refractive power becomes stronger or the negative refractive power becomes weaker, and is configured to satisfy the following conditional expression (1).
(1) 3.7 <f1 / fw <7.0
However,
f1: Focal length fw of the first lens group fw: Focal length of the zoom lens in the wide-angle end state

第3レンズ群は、他のレンズ群に比べてレンズ径の小型化を図ることが可能であるため防振機構を組み込むことに適している。そして、第3レンズを正の屈折力を有する前群と負の屈折力を有する後群とから構成して後群のみを防振レンズ群として用いることで、防振機構の小型化、及び防振レンズ群の質量の軽減を図ることができる。また、正の屈折力を有する第3レンズ群において負の屈折力を有する後群で防振を行うことで、防振時のコマ収差変動を小さく抑えることができる。さらに、このような屈折力配分と、防振レンズ群である後群に少なくとも1つの非球面を導入することとによって、防振レンズ群を光軸と直交する方向へ移動させた場合の結像性能の劣化を小さくことができる。   The third lens group is suitable for incorporating an anti-vibration mechanism because the lens diameter can be reduced as compared with other lens groups. The third lens is composed of a front group having a positive refractive power and a rear group having a negative refractive power, and only the rear group is used as a vibration-proof lens group. The mass of the vibration lens group can be reduced. Further, by performing vibration isolation in the rear lens group having negative refractive power in the third lens group having positive refractive power, fluctuations in coma aberration at the time of vibration isolation can be suppressed. Further, by such refractive power distribution and introducing at least one aspherical surface to the rear group which is the anti-vibration lens group, image formation when the anti-vibration lens group is moved in the direction orthogonal to the optical axis is performed. Performance degradation can be reduced.

上記条件式(1)は、バックフォーカスの確保と結像性能の確保に適した第1レンズ群の焦点距離の範囲を規定するものである。条件式(1)の上限値を上回ると、ズームレンズの全長及び直径が大型化して実用に供することが困難となってしまう。一方、条件式(1)の下限値を下回ると、バックフォーカスが短縮してしまったり、高変倍化する際に望遠端状態において諸収差が大きく発生して結像性能が劣化してしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(1)の上限値を6.0とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(1)の下限値を3.8とすることが望ましい。
Conditional expression (1) defines the range of the focal length of the first lens group suitable for securing the back focus and securing the imaging performance. If the upper limit value of conditional expression (1) is exceeded, the overall length and diameter of the zoom lens will be increased, making it difficult to put to practical use. On the other hand, if the lower limit value of conditional expression (1) is not reached, the back focus is shortened, and various aberrations occur greatly in the telephoto end state when the zooming ratio is increased, and the imaging performance deteriorates.
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (1) to 6.0. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (1) to 3.8.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、以下の条件式(2)を満足することが望ましい。
(2) 1.6 < f3/fw < 3.
だし、
f3 :前記第3レンズ群の焦点距
また本発明の好ましい態様によれば、防振機能を有するズームレンズは、以下の条件式(3),(4),(5)を満足することが望ましい。
(3) 0.0001×(h/2) < |X50| < 0.01×(h/2)
(4) 0.0001×(h/2) < |Xm| < 0.01×(h/2)
(5) |X50|/|Xm| < 1
ただし、
h :前記非球面の有効径
X50:前記非球面の光軸から有効径5割の高さにおける近軸曲率半径と非球面形状との偏差量
Xm :前記非球面の光軸から有効径10割の高さにおける近軸曲率半径と非球面形状との偏差量
Further, according to a preferable aspect of the present invention, it is desirable that the zoom lens having the image stabilization function satisfies the following conditional expression (2 ) .
(2) 1.6 <f3 / fw <3. 5
However it was,
f3: focal length in the third lens group
Further, according to a preferable aspect of the present invention, it is desirable that the zoom lens having the image stabilization function satisfies the following conditional expressions (3), (4), and (5).
(3) 0.0001 × (h / 2) <| X50 | <0.01 × (h / 2)
(4) 0.0001 × (h / 2) <| Xm | <0.01 × (h / 2)
(5) | X50 | / | Xm | <1
However,
h: Effective diameter of the aspheric surface
X50: Deviation amount between the paraxial radius of curvature and the aspherical shape at an effective diameter of 50% from the aspherical optical axis
Xm: Deviation amount between the paraxial radius of curvature and the aspherical shape at an effective diameter of 100% from the aspherical optical axis

条件式(2)は、バックフォーカスの確保と製造誤差に対する性能劣化の緩和に適した第3レンズ群の焦点距離の範囲を規定するものである。条件式(2)の上限値を上回ると、ズームレンズの全長及び直径が大型化して実用に供することが困難となってしまう。一方、条件式(2)の下限値を下回ると、バックフォーカスが短縮してしまったり、製造誤差によって前群と第4レンズ群との間に偏心が生じた場合に諸収差が大きく発生して結像性能が劣化してしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(2)の上限値を3.0とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(2)の下限値を1.8とすることが望ましい。
Conditional expression (2) defines the range of the focal length of the third lens group that is suitable for securing the back focus and alleviating performance deterioration due to manufacturing errors. If the upper limit value of conditional expression (2) is exceeded, the overall length and diameter of the zoom lens will increase, making it difficult to put it into practical use. On the other hand, if the lower limit value of conditional expression (2) is not reached, various aberrations occur when the back focus is shortened or decentration occurs between the front group and the fourth lens group due to manufacturing errors. Imaging performance deteriorates.
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (2) to 3.0. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (2) to 1.8.

条件式(3),(4),(5)は、防振レンズ群である後群を光軸と直交する方向へ移動させた際に結像性能の劣化を小さく抑えるための非球面形状を規定するものである。条件式(3)及び条件式(4)の下限値を下回ると、非球面の補正効果を発揮することができず、諸収差補正のためにレンズ枚数が増加してしまうため望ましくない。一方、条件式(3)及び条件式(4)の上限値を上回ると、コマ収差等の収差補正が過剰になり、これと同時に防振レンズ群を移動させた際の結像性能の劣化を招いてしまう。   Conditional expressions (3), (4), and (5) are aspherical shapes for minimizing degradation of imaging performance when the rear group, which is the anti-vibration lens group, is moved in the direction orthogonal to the optical axis. It prescribes. If the lower limit value of conditional expression (3) and conditional expression (4) is not reached, the aspherical correction effect cannot be achieved, and the number of lenses increases for correction of various aberrations, which is not desirable. On the other hand, if the upper limit value of conditional expression (3) and conditional expression (4) is exceeded, aberration correction such as coma aberration becomes excessive, and at the same time, the imaging performance is deteriorated when the image stabilizing lens group is moved. I will invite you.

また、防振用レンズ群である後群中の少なくとも一つのレンズ面が、近軸曲率半径を有する球面に比して、光軸から周辺へ向かって正の屈折力が徐々に強くなる又は負の屈折力が弱くなる形状の非球面であることによって、防振用レンズ群を移動させる際に、軸上光束及び軸外光束の諸収差を効率良く補正することができる。   In addition, at least one lens surface in the rear lens group that is an anti-vibration lens group has a positive refractive power that gradually increases from the optical axis toward the periphery or negative in comparison with a spherical surface having a paraxial radius of curvature. When the image stabilizing lens group is moved, various aberrations of the on-axis light beam and the off-axis light beam can be efficiently corrected.

なお、本発明の効果をさらに確実なものとするためには、条件式(3)の上限値を0.005×(h/2)とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(3)の下限値を0.0002×(h/2)とすることが望ましい。
なお、本発明の効果をさらに確実なものとするためには、条件式(4)の上限値を0.007×(h/2)とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(4)の下限値を0.0005×(h/2)とすることが望ましい。
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (3) to 0.005 × (h / 2). In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (3) to 0.0002 × (h / 2).
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (4) to 0.007 × (h / 2). In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (4) to 0.0005 × (h / 2).

条件式(5)の上限値を上回ると、防振レンズ群を移動させる際に防振レンズ群内で高次の収差を発生させ、移動後に高次のコマ収差が大きく発生して結像性能の劣化を招いてしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(5)の上限値を0.8とすることが望ましい。
If the upper limit value of conditional expression (5) is exceeded, high-order aberrations are generated in the anti-vibration lens group when the anti-vibration lens group is moved, and high-order coma aberration is greatly generated after the movement. Will lead to deterioration.
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (5) to 0.8.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第3レンズ群と前記第4レンズ群とが物体側へ移動することがズームレンズを小型化する上で望ましい。   According to a preferred aspect of the present invention, the zoom lens having the image stabilization function has the first lens group, the third lens group, and the fourth lens group at the time of zooming from the wide-angle end state to the telephoto end state. It is desirable to move the zoom lens toward the object side in order to reduce the size of the zoom lens.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔が、望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔よりも大きいことがズーム全域で良好な収差性能を実現する上で望ましい。   According to a preferred aspect of the present invention, in the zoom lens having an anti-vibration function, an air interval between the third lens group and the fourth lens group in the wide-angle end state is the same as that in the third lens group in the telephoto end state. It is desirable that the distance between the fourth lens group and the fourth lens group is larger than that in order to achieve good aberration performance over the entire zoom range.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、以下の条件式(6)を満足することが望ましい。
(6) −2.3 < f3R/f3F < −1.2
ただし、
f3F:前記前群の焦点距離
f3R:前記後群の焦点距離
Further, according to a preferable aspect of the present invention, it is desirable that the zoom lens having the image stabilization function satisfies the following conditional expression (6).
(6) -2.3 <f3R / f3F <-1.2
However,
f3F: focal length of the front group f3R: focal length of the rear group

条件式(6)は、後群を防振レンズ群とする際に適切な前群の焦点距離と後群の焦点距離との比を規定するものである。条件式(6)の上限値を上回ると、防振時に光軸と直交する方向へ移動する後群の焦点距離が長くなり、防振時の後群の移動量が大きくなる。このため、防振用の駆動機構の大型化を招いてしまう。一方、条件式(6)の下限値を下回ると、後群の焦点距離が短くなり、防振時に後群を偏心させた場合にコマ収差が大きく発生して結像性能の劣化を招いてしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(6)の上限値を−1.3とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(6)の下限値を−2.0とすることが望ましい。
Conditional expression (6) defines a ratio between the focal length of the front group and the focal length of the rear group, which is appropriate when the rear group is set as the anti-vibration lens group. If the upper limit value of conditional expression (6) is exceeded, the focal length of the rear group that moves in the direction orthogonal to the optical axis during vibration isolation becomes longer, and the amount of movement of the rear group during vibration isolation becomes larger. This leads to an increase in the size of the vibration-proof drive mechanism. On the other hand, if the lower limit value of conditional expression (6) is not reached, the focal length of the rear group will be shortened, and if the rear group is decentered during image stabilization, coma will occur greatly, leading to degradation of imaging performance. .
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (6) to −1.3. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (6) to −2.0.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、以下の条件式(7)を満足することが望ましい。
(7) 0.90 < f3/f4 < 1.6
だし、
f4 :前記第4レンズ群の焦点距
また本発明の好ましい態様によれば、防振機能を有するズームレンズは、以下の条件式(8)を満足することが望ましい。
(8) 1.80 < Bfw/fw < 3.00
ただし、
Bfw:広角端状態におけるバックフォーカス
Further, according to a preferable aspect of the present invention, it is desirable that the zoom lens having the image stabilization function satisfies the following conditional expression (7 ) .
(7) 0.90 <f3 / f4 <1.6 0
However it was,
f4: focal length of the fourth lens group
Further, according to a preferable aspect of the present invention, it is desirable that the zoom lens having the image stabilization function satisfies the following conditional expression (8).
(8) 1.80 <Bfw / fw <3.00
However,
Bfw: Back focus in the wide-angle end state

条件式(7)は、バックフォーカスの確保と製造誤差に対する性能劣化の緩和に適した第3レンズ群の焦点距離と第4レンズ群の焦点距離との比を規定するものである。条件式(7)の上限値を上回ると、第4レンズ群の焦点距離が相対的に短くなる。このため、製造誤差によって前群と第4レンズ群との間に偏心が生じた場合に諸収差が大きく発生して結像性能の劣化が大きくなってしまう。一方、条件式(7)の下限値を下回ると、第3レンズ群の焦点距離が相対的に短くなるため、バックフォーカスの短縮化を招いてしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(7)の上限値を1.5とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(7)の下限値を1.00とすることが望ましい。
Conditional expression (7) defines the ratio between the focal length of the third lens group and the focal length of the fourth lens group, which is suitable for securing the back focus and alleviating the performance deterioration due to manufacturing errors. When the upper limit value of conditional expression (7) is exceeded, the focal length of the fourth lens group becomes relatively short. For this reason, when decentration occurs between the front group and the fourth lens group due to a manufacturing error, various aberrations are generated and the imaging performance is greatly deteriorated. On the other hand, if the lower limit value of conditional expression (7) is not reached, the focal length of the third lens group becomes relatively short, which leads to shortening of the back focus.
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (7) to 1.5. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (7) to 1.00.

条件式(8)は、レンズ交換式のデジタル一眼レフカメラに適したバックフォーカスの範囲を規定するものである。条件式(8)の上限値を上回ると、バックフォーカスが大きくなりすぎて、レンズ全長の大型化を招いてしまう。一方、条件式(8)の下限値を下回ると、バックフォーカスが小さくなり、レンズ後部と一眼レフカメラのミラーとの干渉を招いてしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(8)の上限値を2.5とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(8)の下限値を1.90とすることが望ましい。
Conditional expression (8) defines a back focus range suitable for a lens interchangeable digital single-lens reflex camera. If the upper limit of conditional expression (8) is exceeded, the back focus becomes too large, leading to an increase in the total lens length. On the other hand, if the lower limit value of conditional expression (8) is not reached, the back focus becomes small, causing interference between the rear part of the lens and the mirror of the single-lens reflex camera.
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (8) to 2.5. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (8) to 1.90.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、前記第2レンズ群と第3レンズ群との間に可変開口絞りを有し、以下の条件式(9)を満足することが望ましい。
(9) 0.15 < Ds/f3 < 0.30
ただし、
Ds:前記可変開口絞りと前記後群中の最も物体側のレンズ面との光軸上間隔
According to a preferred aspect of the present invention, the zoom lens having an image stabilization function has a variable aperture stop between the second lens group and the third lens group, and satisfies the following conditional expression (9): It is desirable.
(9) 0.15 <Ds / f3 <0.30
However,
Ds: Distance on the optical axis between the variable aperture stop and the most object side lens surface in the rear group

条件式(9)は、防振レンズ群の適切な位置を規定するものである。条件式(9)の下限値を下回ると、可変開口絞りと防振レンズ群との間隔が広くなり、防振レンズ群の収差補正の低下を招いてしまう。一方、条件式(9)の上限値を上回ると、可変開口絞りと防振レンズ群との間隔が狭くなり、可変開口絞りのメカ機構と防振用のメカ機構との干渉を招いてしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(9)の上限値を0.26とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(9)の下限値を0.18とすることが望ましい。
Conditional expression (9) defines an appropriate position of the image stabilizing lens group. If the lower limit value of conditional expression (9) is not reached, the distance between the variable aperture stop and the image stabilizing lens group becomes wide, leading to a decrease in aberration correction of the image stabilizing lens group. On the other hand, if the upper limit value of conditional expression (9) is exceeded, the distance between the variable aperture stop and the anti-vibration lens group becomes narrow, causing interference between the variable aperture stop mechanism and the anti-vibration mechanism.
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (9) to 0.26. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (9) to 0.18.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、以下の条件式(10)を満足することが望ましい。
(10) −0.90 < fw/Re < 0.20
ただし、
Re:前記ズームレンズ中の最も像側のレンズ面の曲率半径
Further, according to a preferred aspect of the present invention, it is desirable that the zoom lens having the image stabilization function satisfies the following conditional expression (10).
(10) -0.90 <fw / Re <0.20
However,
Re: radius of curvature of the lens surface closest to the image side in the zoom lens

条件式(10)は、諸収差の良好な補正とゴーストの低減に適した最終レンズ面、即ちズームレンズ中の最も像側のレンズ面の曲率半径の範囲を規定するものである。なお、最終レンズ面は、「fw/Re」の符号が正の場合は像側に凹形状、負の場合は像側に凸形状となる。
条件式(10)の上限値を上回ると、最終レンズ面は像側に凹で比較的屈折力の強いレンズ面となる。このため、像面で反射された光が最終レンズ面でさらに反射されてゴーストとなる際に、像側に凹の最終レンズ面によって収斂されて像面に達することとなるため、目立ちやすくなってしまう。一方、条件式(10)の下限値を下回ると、最終レンズ面は像側に凸で屈折力の強いレンズ面となる。このため、コマ収差と像面湾曲収差を良好に補正することが困難となってしまう。
なお、本発明の効果をさらに確実なものとするためには、条件式(10)の上限値を0.15とすることが望ましい。また、本発明の効果をさらに確実なものとするためには、条件式(10)の下限値を−0.70とすることが望ましい。
Conditional expression (10) defines the range of the radius of curvature of the final lens surface suitable for good correction of various aberrations and reduction of ghosts, that is, the lens surface closest to the image side in the zoom lens. The final lens surface has a concave shape on the image side when the sign of “fw / Re” is positive, and has a convex shape on the image side when negative.
When the upper limit value of conditional expression (10) is exceeded, the final lens surface is concave on the image side and becomes a lens surface having a relatively strong refractive power. For this reason, when the light reflected by the image surface is further reflected by the final lens surface and becomes a ghost, the light is converged by the final lens surface that is concave on the image side and reaches the image surface. End up. On the other hand, if the lower limit of conditional expression (10) is not reached, the final lens surface becomes a lens surface that is convex on the image side and has strong refractive power. For this reason, it becomes difficult to correct coma aberration and field curvature aberration satisfactorily.
In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (10) to 0.15. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (10) to −0.70.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、前記後群中の最も物体側のレンズ面は像側に凸形状であることが望ましい。
この構成により、防振レンズ群に入射する軸外光束の入射角を緩やかにすることができ、防振のために後群を偏心させた際のコマ収差の発生を軽減できる。
According to still another preferable aspect of the present invention, in the zoom lens having an anti-vibration function, it is desirable that the lens surface closest to the object side in the rear group has a convex shape on the image side.
With this configuration, the incident angle of the off-axis light beam incident on the anti-vibration lens group can be made gentle, and the occurrence of coma aberration when the rear group is decentered for anti-vibration can be reduced.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、前記第4レンズ群中の最も物体側のレンズは正レンズであり、当該正レンズの像側レンズ面は像側に凸形状であることが望ましい。そうすることにより、像面からの反射光によるゴーストを軽減することが可能である。
防振レンズ群である後群が負の屈折力を有し、該後群の像側に正レンズを隣接させることで、防振時に発生する諸収差に対して良好な補正を行うことが可能となる。
According to a preferred aspect of the present invention, in the zoom lens having an image stabilization function, the most object side lens in the fourth lens group is a positive lens, and the image side lens surface of the positive lens is convex on the image side. The shape is desirable. By doing so, it is possible to reduce the ghost caused by the reflected light from the image plane.
The rear group, which is an anti-vibration lens group, has a negative refractive power, and by making a positive lens adjacent to the image side of the rear group, it is possible to correct various aberrations that occur during image stabilization. It becomes.

また、防振時に収差を良好に補正した状態を保つためには、防振レンズ群のみでなく該防振レンズ群の像側に位置するレンズ群に対しても良好な収差補正が必要となる。そこで、前記正レンズの像側レンズ面を像側に凸形状とする。これにより、特にこの像側レンズ面から出射される光の出射角を小さく保つことができるため、防振のために後群を偏心させた際の結像性能の劣化を軽減することができる。   In addition, in order to maintain a state in which aberrations are favorably corrected during image stabilization, good aberration correction is required not only for the image stabilization lens group but also for the lens group located on the image side of the image stabilization lens group. . Therefore, the image side lens surface of the positive lens is convex on the image side. Thereby, in particular, since the emission angle of the light emitted from the image side lens surface can be kept small, it is possible to reduce the deterioration of the imaging performance when the rear group is decentered for image stabilization.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、前記第4レンズ群における最も物体側のレンズは、少なくとも1つのレンズ面が非球面である両凸形状の正レンズであることが望ましい。
この構成により、正レンズの強い屈折力を保ちながら、防振のために後群を偏心させた際の結像性能の劣化をより一層軽減することができる。
According to still another preferable aspect of the present invention, in the zoom lens having an anti-vibration function, the most object side lens in the fourth lens group is a biconvex positive lens having at least one aspheric surface. It is desirable.
With this configuration, it is possible to further reduce deterioration in imaging performance when the rear group is decentered for image stabilization while maintaining the strong refractive power of the positive lens.

また本発明の好ましい態様によれば、防振機能を有するズームレンズは、前記第4レンズ群は少なくとも1つの接合レンズを有し、当該接合レンズの接合面は像側に凸形状であることが望ましい。
この構成により、軸外光束の色収差を良好に補正し、かつ前記接合面から出射される光の出射角を小さく保つことができ、諸収差を良好に補正することが可能となる。
According to a preferred aspect of the present invention, in the zoom lens having an anti-vibration function, the fourth lens group has at least one cemented lens, and the cemented surface of the cemented lens has a convex shape on the image side. desirable.
With this configuration, the chromatic aberration of the off-axis light beam can be corrected well, the emission angle of the light emitted from the joint surface can be kept small, and various aberrations can be corrected well.

以下、本発明の各実施例に係る防振機能を有するズームレンズを添付図面に基づいて説明する。
(第1実施例)
図1は、本発明の第1実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。
本実施例に係る防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、可変開口絞りSと、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
Hereinafter, zoom lenses having an image stabilization function according to embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a diagram showing a lens configuration of a zoom lens having an image stabilization function according to the first embodiment of the present invention.
The zoom lens having an image stabilization function according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a variable aperture stop S. The third lens group G3 having positive refractive power and the fourth lens group G4 having positive refractive power.

そして本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態への変倍に際し、第1レンズ群G1と第2レンズ群G2との空気間隔が増大し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第3レンズ群G3と第4レンズ群G4との空気間隔が減少するように、第1レンズ群G1と第3レンズ群G3と第4レンズ群G4が物体側へ移動し、第2レンズ群G2が移動する。   In the zoom lens having the image stabilization function according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state, and the second lens. The first lens group G1, the third lens group G3, and the third lens group G3 are arranged so that the air gap between the group G2 and the third lens group G3 is reduced and the air gap between the third lens group G3 and the fourth lens group G4 is reduced. The fourth lens group G4 moves to the object side, and the second lens group G2 moves.

第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と両凸形状の正レンズL12との接合レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL21と、両凹形状の負レンズL22と、両凸形状の正レンズL23と、物体側に凹面を向けた負メニスカスレンズL24とからなる。そして、第2レンズ群G2において最も物体側に位置する負メニスカスレンズL21は、物体側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the object side.

第3レンズ群G3は、物体側から順に、正の屈折力を有する前群G3Fと、負の屈折力を有する後群G3Rとから構成されており、後群G3Rのみを光軸と直交する方向へ移動させることによって防振、即ち手ぶれ補正を行う。
前群G3Fは、物体側から順に、両凸形状の正レンズL31と、両凸形状の正レンズL32と両凹形状の負レンズL33との接合レンズとからなる。
後群G3Rは、物体側から順に、両凹形状の負レンズL34と物体側に凸面を向けた正メニスカスレンズL35との接合レンズからなる。そして、後群G3Rにおいて最も物体側に位置する両凹形状の負レンズL34は、物体側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。
The third lens group G3 includes, in order from the object side, a front group G3F having a positive refractive power and a rear group G3R having a negative refractive power, and only the rear group G3R is orthogonal to the optical axis. The image stabilization, that is, the camera shake correction is performed by moving to the position.
The front group G3F includes, in order from the object side, a biconvex positive lens L31, and a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33.
The rear group G3R includes, in order from the object side, a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface facing the object side. The biconcave negative lens L34 located closest to the object side in the rear group G3R is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the object side.

第4レンズ群G4は、物体側から順に、両凸形状の正レンズL41と、両凸形状の正レンズL42と両凹形状の負レンズL43との接合レンズと、物体側に凹面を向けた正メニスカスレンズL44とからなる。そして、第4レンズ群G4において最も物体側に位置する両凸形状の正レンズL41は、物体側のレンズ面を非球面形状とした非球面レンズである。   The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, a cemented lens of a biconvex positive lens L42 and a biconcave negative lens L43, and a positive surface with a concave surface facing the object side. And a meniscus lens L44. The biconvex positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.

可変開口絞りSは、上述のように第2レンズ群G2と第3レンズ群G3との間に位置し、広角端状態から望遠端状態への変倍に際し、第3レンズ群G3の前群G3Fとともに移動する。
また、遠距離から近距離へのフォーカシングは、第2レンズ群G2を物体側へ移動させることによって行われる。
As described above, the variable aperture stop S is located between the second lens group G2 and the third lens group G3, and the front group G3F of the third lens group G3 is changed upon zooming from the wide-angle end state to the telephoto end state. Move with.
Further, focusing from a long distance to a short distance is performed by moving the second lens group G2 to the object side.

上述のようにぶれ補正は、後群G3Rのみを光軸と直交する方向へ移動させることによって行われる。ここで、レンズ全系の焦点距離がfで、ぶれ補正に際する移動レンズ群の移動量に対する結像面における像の移動量の比、即ち防振係数がKのレンズにおいて、角度θの回転ぶれを補正するためには、ぶれ補正用の移動レンズ群を(f・tanθ)/Kだけ光軸と直交する方向へ移動させればよい。   As described above, the shake correction is performed by moving only the rear group G3R in the direction orthogonal to the optical axis. Here, in the case where the focal length of the entire lens system is f and the ratio of the amount of movement of the image on the imaging surface to the amount of movement of the moving lens group at the time of blurring correction, that is, the lens having the anti-vibration coefficient K, the angle θ is rotated. In order to correct the blur, the movable lens group for blur correction may be moved in a direction orthogonal to the optical axis by (f · tan θ) / K.

したがって本実施例に係る防振機能を有するズームレンズは、広角端状態において、防振係数Kは1.115、焦点距離fは18.50(mm)であるため、0.60°の回転ぶれを補正するための後群G3Rの移動量は0.174(mm)となる。また、望遠端状態においては、防振係数Kは2.016、焦点距離fは194.45(mm)であるため、0.20°の回転ぶれを補正するための後群G3Rの移動量は0.337(mm)となる。   Therefore, in the zoom lens having the image stabilization function according to the present embodiment, the image stabilization coefficient K is 1.115 and the focal length f is 18.50 (mm) in the wide-angle end state. The amount of movement of the rear group G3R for correcting is 0.174 (mm). In the telephoto end state, since the image stabilization coefficient K is 2.016 and the focal length f is 194.45 (mm), the amount of movement of the rear group G3R for correcting the rotation blur of 0.20 ° is 0.337 (mm).

以下の表1に、本実施例に係る防振機能を有するズームレンズの諸元の値を掲げる。
[全体諸元]において、fは焦点距離、FNOはFナンバー、2ωは画角をそれぞれ示す。
[レンズデータ]において、第1カラム面は物体側からのレンズ面の順序、第2カラムrはレンズ面の曲率半径、第3カラムdはレンズ面の間隔、第4カラムνはd線(λ=587.6nm)に対するアッベ数、第5カラムnはd線(λ=587.6nm)に対する屈折率をそれぞれ示す。また、∞は平面、B.f.はバックフォーカスをそれぞれ示し、空気の屈折率1.0000はその記載を省略している。
Table 1 below lists values of specifications of the zoom lens having the image stabilization function according to the present embodiment.
In [Overall specifications], f represents a focal length, FNO represents an F number, and 2ω represents an angle of view.
In [Lens Data], the first column surface is the order of the lens surfaces from the object side, the second column r is the radius of curvature of the lens surfaces, the third column d is the distance between the lens surfaces, and the fourth column ν is the d line (λ Abbe number with respect to 587.6 nm), and the fifth column n indicates the refractive index with respect to the d-line (λ = 587.6 nm). Further, ∞ represents a plane, Bf represents a back focus, and the refractive index of air is omitted from 1.000.

[非球面データ]には、非球面を次式で表した場合の非球面係数を示す。
x=(h/r)/[1+{1−κ(h/r)1/2
+bh+ch+dh+eh10
ここで、xを非球面の頂点を基準としたときの光軸からの高さhの位置における光軸方向の変位、κを円錐定数、b,c,d,eを非球面係数、rを[レンズ諸元]中に示される近軸曲率半径とする。
なお、「E-n」は「×10−n」を示し、例えば「1.234E-05」は「1.234×10−5」を示す。
[可変間隔データ]には、焦点距離f及び可変間隔の値を示す。
[Aspherical data] shows an aspherical coefficient when the aspherical surface is expressed by the following equation.
x = (h 2 / r) / [1+ {1−κ (h / r) 2 } 1/2 ]
+ Bh 4 + ch 6 + dh 8 + eh 10
Here, x is the displacement in the optical axis direction at the position of height h from the optical axis when the apex of the aspheric surface is used as a reference, κ is the conic constant, b, c, d, e are aspheric coefficients, and r is The paraxial radius of curvature shown in [Lens Specifications].
“En” indicates “× 10 −n ”, for example “1.234E-05” indicates “1.234 × 10 −5 ”.
[Variable interval data] indicates the focal length f and the value of the variable interval.

ここで、以下の各実施例の全ての諸元値において掲載されている焦点距離f、曲率半径r、その他長さの単位は一般に「mm」が使われる。しかし光学系は、比例拡大または比例縮小しても同等の光学性能が得られるため、単位は「mm」に限られるものではない。
尚、以下の全実施例の諸元値においても、本実施例と同様の符号を用いる。
Here, in general, “mm” is used as a unit of the focal length f, the radius of curvature r, and other lengths listed in all the specification values of the following embodiments. However, since the optical system can obtain the same optical performance even when proportionally enlarged or reduced, the unit is not limited to “mm”.
In addition, the same code | symbol as a present Example is used also in the specification value of all the following Examples.

(表1)
[全体諸元]
広角端状態 中間焦点距離状態 望遠端状態
f = 18.50 〜 69.55 〜 194.45
FNO= 3.52 〜 5.08 〜 5.88
2ω = 77.59 〜 22.23 〜 8.12

[レンズデータ]
面 r d ν n
(第1レンズ群G1)
1 140.0000 2.0000 32.35 1.850260
2 66.3969 8.7000 82.52 1.497820
3 -405.8300 0.1000
4 59.5278 6.1000 65.47 1.603000
5 264.8699 (d5)
(第2レンズ群G2)
6 500.0000 0.2000 38.09 1.553890 非球面
7 300.0000 1.2000 46.63 1.816000
8 15.0345 5.9000
9 -52.6734 1.2000 46.63 1.816000
10 45.9439 0.1000
11 30.0000 4.6000 23.78 1.846660
12 -50.4359 1.0000
13 -28.5856 1.0000 52.32 1.755000
14 -185.8275 (d14)
(可変開口絞りS)
15 ∞ 0.5000
(第3レンズ群G3)
(前群G3F)
16 34.7750 3.0000 60.09 1.640000
17 -37.3372 0.1000
18 29.1870 3.6000 82.52 1.497820
19 -24.9540 1.0000 32.35 1.850260
20 197.2081 3.0000
(後群G3R)
21 -43.6102 0.0500 38.09 1.553890 非球面
22 -43.6102 1.0000 49.61 1.772500
23 25.2115 1.8000 25.43 1.805180
24 92.1796 (d24)
(第4レンズ群G4)
25 80.0000 4.0000 55.34 1.677900 非球面
26 -32.0531 1.5000
27 80.0000 3.6000 82.52 1.497820
28 -40.0000 1.4000 37.17 1.834000
29 46.7003 1.8000
30 -120.0000 2.8000 65.47 1.603000
31 -29.3134 (B.f.)

[非球面データ]
第6面
κ b c d e
1.0000 1.10280E-05 -3.56250E-08 1.02120E-10 -1.60960E-13
第21面 非球面有効径 14.8mm
κ b c d e
0.0837 7.62690E-06 0.00000E+00 0.00000E+00 0.00000E+00
第25面
κ b c d e
-22.2603 -1.24410E-05 0.00000E+00 0.00000E+00 0.00000E+00

[可変間隔データ]
広角端状態 中間焦点距離状態 望遠端状態
f 18.50075 69.54912 194.45435
d5 2.40000 38.00000 60.56391
d14 29.30000 11.00000 1.50000
d24 10.00000 3.60000 2.00000
B.f. 38.11416 66.22937 78.56798
(Table 1)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 18.50 to 69.55 to 194.45
FNO = 3.52 to 5.08 to 5.88
2ω = 77.59 to 22.23 to 8.12

[Lens data]
Surface r d v n
(First lens group G1)
1 140.0000 2.0000 32.35 1.850260
2 66.3969 8.7000 82.52 1.497820
3 -405.8300 0.1000
4 59.5278 6.1000 65.47 1.603000
5 264.8699 (d5)
(Second lens group G2)
6 500.0000 0.2000 38.09 1.553890 Aspheric
7 300.0000 1.2000 46.63 1.816000
8 15.0345 5.9000
9 -52.6734 1.2000 46.63 1.816000
10 45.9439 0.1000
11 30.0000 4.6000 23.78 1.846660
12 -50.4359 1.0000
13 -28.5856 1.0000 52.32 1.755000
14 -185.8275 (d14)
(Variable aperture stop S)
15 ∞ 0.5000
(Third lens group G3)
(Front group G3F)
16 34.7750 3.0000 60.09 1.640000
17 -37.3372 0.1000
18 29.1870 3.6000 82.52 1.497820
19 -24.9540 1.0000 32.35 1.850 260
20 197.2081 3.0000
(Rear group G3R)
21 -43.6102 0.0500 38.09 1.553890 Aspheric
22 -43.6102 1.0000 49.61 1.772500
23 25.2115 1.8000 25.43 1.805180
24 92.1796 (d24)
(Fourth lens group G4)
25 80.0000 4.0000 55.34 1.677900 Aspheric
26 -32.0531 1.5000
27 80.0000 3.6000 82.52 1.497820
28 -40.0000 1.4000 37.17 1.834000
29 46.7003 1.8000
30 -120.0000 2.8000 65.47 1.603000
31 -29.3134 (Bf)

[Aspherical data]
6th surface κ b c de
1.0000 1.10280E-05 -3.56250E-08 1.02120E-10 -1.60960E-13
21st surface Aspheric effective diameter 14.8mm
κ b c de
0.0837 7.62690E-06 0.00000E + 00 0.00000E + 00 0.00000E + 00
25th surface κ b c de
-22.2603 -1.24410E-05 0.00000E + 00 0.00000E + 00 0.00000E + 00

[Variable interval data]
Wide-angle end state Intermediate focal length state Telephoto end state
f 18.50075 69.54912 194.45435
d5 2.40000 38.00000 60.56391
d14 29.30000 11.00000 1.50000
d24 10.00000 3.60000 2.00000
Bf 38.11416 66.22937 78.56798

図2(a)、及び図2(b)はそれぞれ、本発明の第1実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
図3は、本発明の第1実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。
図4(a)、及び図4(b)はそれぞれ、本発明の第1実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
2A and 2B are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the first example of the present invention, and 0.60, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.
FIG. 3 is a diagram illustrating various aberrations when the zoom lens having the image stabilization function according to the first embodiment of the present invention is focused at infinity in the intermediate focal length state.
FIGS. 4A and 4B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens having the image stabilization function according to the first example of the present invention, and 0.20, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.

各収差図において、FNOはFナンバー、Yは像高をそれぞれ示す。なお、球面収差図では最大口径に対応するFナンバーの値を示し、非点収差図及び歪曲収差図では像高の最大値をそれぞれ示し、コマ収差図では各像高の値を示す。またdはd線(λ=587.6nm)、gはg線(λ=435.8nm)をそれぞれ示す。そして非点収差図において、実線はサジタル像面、破線はメリディオナル像面をそれぞれ示す。
なお、以下に示す各実施例の諸収差図において、本実施例と同様の符号を用いる。
In each aberration diagram, FNO represents an F number, and Y represents an image height. The spherical aberration diagram shows the F-number value corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram show the maximum image height, and the coma diagram shows the value of each image height. D represents a d-line (λ = 587.6 nm), and g represents a g-line (λ = 435.8 nm). In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane.
In addition, in the various aberration diagrams of each example shown below, the same reference numerals as those in this example are used.

各諸収差図より本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態までの各焦点距離状態において、諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the zoom lens having the image stabilization function according to the present embodiment corrects various aberrations well in each focal length state from the wide-angle end state to the telephoto end state, and has excellent imaging performance. You can see that

(第2実施例)
図5は、本発明の第2実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。
本実施例に係る防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、可変開口絞りSと、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
(Second embodiment)
FIG. 5 is a diagram showing a lens configuration of a zoom lens having an image stabilization function according to the second embodiment of the present invention.
The zoom lens having an image stabilization function according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a variable aperture stop S. The third lens group G3 having positive refractive power and the fourth lens group G4 having positive refractive power.

そして本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態への変倍に際し、第1レンズ群G1と第2レンズ群G2との空気間隔が増大し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第3レンズ群G3と第4レンズ群G4との空気間隔が減少するように、第1レンズ群G1と第3レンズ群G3と第4レンズ群G4が物体側へ移動し、第2レンズ群G2が移動する。   In the zoom lens having the image stabilization function according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state, and the second lens. The first lens group G1, the third lens group G3, and the third lens group G3 are arranged so that the air gap between the group G2 and the third lens group G3 is reduced and the air gap between the third lens group G3 and the fourth lens group G4 is reduced. The fourth lens group G4 moves to the object side, and the second lens group G2 moves.

第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と両凸形状の正レンズL12との接合レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL21と、両凹形状の負レンズL22と、両凸形状の正レンズL23と、物体側に凹面を向けた負メニスカスレンズL24とからなる。そして、第2レンズ群G2において最も物体側に位置する負メニスカスレンズL21は、物体側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the object side.

第3レンズ群G3は、物体側から順に、正の屈折力を有する前群G3Fと、負の屈折力を有する後群G3Rとから構成されており、後群G3Rのみを光軸と直交する方向へ移動させることによって防振、即ち手ぶれ補正を行う。
前群G3Fは、物体側から順に、両凸形状の正レンズL31と、両凸形状の正レンズL32と物体側に凹面を向けた平凹形状の負レンズL33との接合レンズとからなる。
後群G3Rは、物体側から順に、両凹形状の負レンズL34と物体側に凸面を向けた正メニスカスレンズL35との接合レンズからなる。そして、後群G3Rにおいて最も物体側に位置する両凹形状の負レンズL34は、物体側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。
The third lens group G3 includes, in order from the object side, a front group G3F having a positive refractive power and a rear group G3R having a negative refractive power, and only the rear group G3R is orthogonal to the optical axis. The image stabilization, that is, the camera shake correction is performed by moving to the position.
The front group G3F includes, in order from the object side, a cemented lens of a biconvex positive lens L31, a biconvex positive lens L32, and a plano-concave negative lens L33 with a concave surface facing the object side.
The rear group G3R includes, in order from the object side, a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface facing the object side. The biconcave negative lens L34 located closest to the object side in the rear group G3R is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the object side.

第4レンズ群G4は、物体側から順に、両凸形状の正レンズL41と、両凸形状の正レンズL42と両凹形状の負レンズL43との接合レンズと、物体側に凹面を向けた正メニスカスレンズL44とからなる。そして、第4レンズ群G4において最も物体側に位置する両凸形状の正レンズL41は、物体側のレンズ面を非球面形状とした非球面レンズである。   The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, a cemented lens of a biconvex positive lens L42 and a biconcave negative lens L43, and a positive surface with a concave surface facing the object side. And a meniscus lens L44. The biconvex positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.

可変開口絞りSは、上述のように第2レンズ群G2と第3レンズ群G3との間に位置し、広角端状態から望遠端状態への変倍に際し、第3レンズ群G3の前群G3Fとともに移動する。
また、遠距離から近距離へのフォーカシングは、第2レンズ群G2を物体側へ移動させることによって行われる。
As described above, the variable aperture stop S is located between the second lens group G2 and the third lens group G3, and the front group G3F of the third lens group G3 is changed upon zooming from the wide-angle end state to the telephoto end state. Move with.
Further, focusing from a long distance to a short distance is performed by moving the second lens group G2 to the object side.

上述のようにぶれ補正は、後群G3Rのみを光軸と直交する方向へ移動させることによって行われる。本実施例に係る防振機能を有するズームレンズは、広角端状態において、防振係数Kは1.134、焦点距離fは18.50(mm)であるため、0.60°の回転ぶれを補正するための後群G3Rの移動量は0.171(mm)となる。また、望遠端状態においては、防振係数Kは2.009、焦点距離fは195.00(mm)であるため、0.20°の回転ぶれを補正するための後群G3Rの移動量は0.339(mm)となる。
以下の表2に、本実施例に係る防振機能を有するズームレンズの諸元の値を掲げる。
As described above, the shake correction is performed by moving only the rear group G3R in the direction orthogonal to the optical axis. In the zoom lens having the image stabilization function according to the present embodiment, the image stabilization coefficient K is 1.134 and the focal length f is 18.50 (mm) in the wide-angle end state. The amount of movement of the rear group G3R for correction is 0.171 (mm). In the telephoto end state, since the image stabilization coefficient K is 2.009 and the focal length f is 195.00 (mm), the amount of movement of the rear group G3R for correcting the rotation blur of 0.20 ° is 0.339 (mm).
Table 2 below lists values of specifications of the zoom lens having the image stabilization function according to the present embodiment.

(表2)
[全体諸元]
広角端状態 中間焦点距離状態 望遠端状態
f = 18.50 〜 70.58 〜 195.00
FNO= 3.57 〜 5.09 〜 5.81
2ω = 77.44 〜 21.91 〜 8.10

[レンズデータ]
面 r d ν n
(第1レンズ群G1)
1 134.2298 2.0000 32.35 1.850260
2 64.0930 8.8000 81.61 1.497000
3 -455.1922 0.1000
4 59.0442 6.3000 65.47 1.603000
5 278.8837 (d5)
(第2レンズ群G2)
6 169.6714 0.1500 38.09 1.553890 非球面
7 116.5468 1.2000 46.63 1.816000
8 14.1945 5.6000
9 -50.0283 1.0000 46.63 1.816000
10 39.1951 0.1000
11 27.2138 4.8000 23.78 1.846660
12 -47.2390 0.9000
13 -26.4293 1.0000 47.38 1.788000
14 -144.6464 (d14)
(可変開口絞りS)
15 ∞ 0.5000
(第3レンズ群G3)
(前群G3F)
16 40.5909 3.0000 65.47 1.603000
17 -40.5909 0.1000
18 26.4211 3.6000 81.61 1.497000
19 -31.3570 1.0000 32.35 1.850260
20 ∞ 3.0000
(後群G3R)
21 -48.0486 0.1000 38.09 1.553890 非球面
22 -50.9404 1.0000 49.61 1.772500
23 29.8100 1.8000 25.43 1.805180
24 78.3305 (d24)
(第4レンズ群G4)
25 80.0866 4.4000 54.52 1.676974 非球面
26 -32.2199 0.6000
27 119.1591 4.0000 70.24 1.487490
28 -32.0950 1.4000 37.17 1.834000
29 60.5341 1.5000
30 -119.5799 3.3000 64.12 1.516800
31 -28.0454 (B.f.)

[非球面データ]
第6面
κ b c d e
1.0000 1.00790E-05 -4.17580E-08 1.36860E-10 -2.18740E-13
第21面 非球面有効径 15.0mm
κ b c d e
1.0000 9.66620E-06 3.29250E-09 0.00000E+00 0.00000E+00
第25面
κ b c d e
1.0000 -1.94720E-05 2.75020E-09 0.00000E+00 0.00000E+00

[可変間隔データ]
広角端状態 中間焦点距離状態 望遠端状態
f 18.50109 70.58244 194.99580
d5 2.07000 38.00000 60.00000
d14 29.40000 11.00000 1.80000
d24 10.10000 4.60000 3.00000
B.f. 38.04456 67.30022 79.17192
(Table 2)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 18.50 to 70.58 to 195.00
FNO = 3.57 to 5.09 to 5.81
2ω = 77.44 to 21.91 to 8.10

[Lens data]
Surface r d v n
(First lens group G1)
1 134.2298 2.0000 32.35 1.850 260
2 64.0930 8.8000 81.61 1.497000
3 -455.1922 0.1000
4 59.0442 6.3000 65.47 1.603000
5 278.8837 (d5)
(Second lens group G2)
6 169.6714 0.1500 38.09 1.553890 Aspheric
7 116.5468 1.2000 46.63 1.816000
8 14.1945 5.6000
9 -50.0283 1.0000 46.63 1.816000
10 39.1951 0.1000
11 27.2138 4.8000 23.78 1.846660
12 -47.2390 0.9000
13 -26.4293 1.0000 47.38 1.788000
14 -144.6464 (d14)
(Variable aperture stop S)
15 ∞ 0.5000
(Third lens group G3)
(Front group G3F)
16 40.5909 3.0000 65.47 1.603000
17 -40.5909 0.1000
18 26.4211 3.6000 81.61 1.497000
19 -31.3570 1.0000 32.35 1.850 260
20 ∞ 3.0000
(Rear group G3R)
21 -48.0486 0.1000 38.09 1.553890 Aspheric
22 -50.9404 1.0000 49.61 1.772500
23 29.8100 1.8000 25.43 1.805180
24 78.3305 (d24)
(Fourth lens group G4)
25 80.0866 4.4000 54.52 1.676974 Aspheric
26 -32.2199 0.6000
27 119.1591 4.0000 70.24 1.487490
28 -32.0950 1.4000 37.17 1.834000
29 60.5341 1.5000
30 -119.5799 3.3000 64.12 1.516800
31 -28.0454 (Bf)

[Aspherical data]
6th surface κ b c de
1.0000 1.00790E-05 -4.17580E-08 1.36860E-10 -2.18740E-13
21st surface Aspheric effective diameter 15.0mm
κ b c de
1.0000 9.66620E-06 3.29250E-09 0.00000E + 00 0.00000E + 00
25th surface κ b c de
1.0000 -1.94720E-05 2.75020E-09 0.00000E + 00 0.00000E + 00

[Variable interval data]
Wide-angle end state Intermediate focal length state Telephoto end state
f 18.50109 70.58244 194.99580
d5 2.07000 38.00000 60.00000
d14 29.40000 11.00000 1.80000
d24 10.10000 4.60000 3.00000
Bf 38.04456 67.30022 79.17192

図6(a)、及び図6(b)はそれぞれ、本発明の第2実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
図7は、本発明の第2実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。
図8(a)、及び図8(b)はそれぞれ、本発明の第2実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
FIGS. 6A and 6B are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the second example of the present invention, and 0.60, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.
FIG. 7 is a diagram illustrating various aberrations when the zoom lens having the image stabilization function according to the second embodiment of the present invention is focused at infinity in the intermediate focal length state.
FIGS. 8A and 8B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens having the image stabilization function according to the second example of the present invention, and 0.20, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.

各諸収差図より本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態までの各焦点距離状態において、諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the zoom lens having the image stabilization function according to the present embodiment corrects various aberrations well in each focal length state from the wide-angle end state to the telephoto end state, and has excellent imaging performance. You can see that

(第3実施例)
図9は、本発明の第3実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。
本実施例に係る防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、可変開口絞りSと、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
(Third embodiment)
FIG. 9 is a diagram showing a lens configuration of a zoom lens having an image stabilization function according to the third example of the present invention.
The zoom lens having an image stabilization function according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a variable aperture stop S. The third lens group G3 having positive refractive power and the fourth lens group G4 having positive refractive power.

そして本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態への変倍に際し、第1レンズ群G1と第2レンズ群G2との空気間隔が増大し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第3レンズ群G3と第4レンズ群G4との空気間隔が減少するように、第1レンズ群G1と第3レンズ群G3と第4レンズ群G4が物体側へ移動し、第2レンズ群G2が移動する。   In the zoom lens having the image stabilization function according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state, and the second lens. The first lens group G1, the third lens group G3, and the third lens group G3 are arranged so that the air gap between the group G2 and the third lens group G3 is reduced and the air gap between the third lens group G3 and the fourth lens group G4 is reduced. The fourth lens group G4 moves to the object side, and the second lens group G2 moves.

第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と両凸形状の正レンズL12との接合レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL21と、両凹形状の負レンズL22と、両凸形状の正レンズL23と、物体側に凹面を向けた負メニスカスレンズL24とからなる。そして、第2レンズ群G2において最も物体側に位置する負メニスカスレンズL21は、物体側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the object side.

第3レンズ群G3は、物体側から順に、正の屈折力を有する前群G3Fと、負の屈折力を有する後群G3Rとから構成されており、後群G3Rのみを光軸と直交する方向へ移動させることによって防振、即ち手ぶれ補正を行う。
前群G3Fは、物体側から順に、両凸形状の正レンズL31と、両凸形状の正レンズL32と両凹形状の負レンズL33との接合レンズとからなる。
後群G3Rは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL34と両凹形状の負レンズL35との接合レンズからなる。そして、後群G3Rにおいて最も物体側に位置する正メニスカスレンズL34は、物体側のレンズ面を非球面形状とした非球面レンズである。
The third lens group G3 includes, in order from the object side, a front group G3F having a positive refractive power and a rear group G3R having a negative refractive power, and only the rear group G3R is orthogonal to the optical axis. The image stabilization, that is, the camera shake correction is performed by moving to the position.
The front group G3F includes, in order from the object side, a biconvex positive lens L31, and a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33.
The rear group G3R includes, in order from the object side, a cemented lens of a positive meniscus lens L34 having a concave surface facing the object side and a biconcave negative lens L35. The positive meniscus lens L34 located closest to the object side in the rear group G3R is an aspheric lens having an aspheric lens surface on the object side.

第4レンズ群G4は、物体側から順に、両凸形状の正レンズL41と、物体側に凹面を向けた正メニスカスレンズL42と両凹形状の負レンズL43との接合レンズとからなる。そして、第4レンズ群G4において最も物体側に位置する両凸形状の正レンズL41は、両側のレンズ面を非球面形状とした両面非球面レンズである。   The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, and a cemented lens of a positive meniscus lens L42 having a concave surface facing the object side and a biconcave negative lens L43. The biconvex positive lens L41 located closest to the object side in the fourth lens group G4 is a double-sided aspherical lens in which both lens surfaces are aspherical.

可変開口絞りSは、上述のように第2レンズ群G2と第3レンズ群G3との間に位置し、広角端状態から望遠端状態への変倍に際し、第3レンズ群G3の前群G3Fとともに移動する。
また、遠距離から近距離へのフォーカシングは、第2レンズ群G2を物体側へ移動させることによって行われる。
As described above, the variable aperture stop S is located between the second lens group G2 and the third lens group G3, and the front group G3F of the third lens group G3 is changed upon zooming from the wide-angle end state to the telephoto end state. Move with.
Further, focusing from a long distance to a short distance is performed by moving the second lens group G2 to the object side.

上述のようにぶれ補正は、後群G3Rのみを光軸と直交する方向へ移動させることによって行われる。本実施例に係る防振機能を有するズームレンズは、広角端状態において、防振係数Kは0.889、焦点距離fは18.30(mm)であるため、0.60°の回転ぶれを補正するための後群G3Rの移動量は0.216(mm)となる。また、望遠端状態においては、防振係数Kは1.747、焦点距離fは196.00(mm)であるため、0.20°の回転ぶれを補正するための後群G3Rの移動量は0.392(mm)となる。
以下の表3に、本実施例に係る防振機能を有するズームレンズの諸元の値を掲げる。
As described above, the shake correction is performed by moving only the rear group G3R in the direction orthogonal to the optical axis. In the zoom lens having the image stabilization function according to the present embodiment, the image stabilization coefficient K is 0.889 and the focal length f is 18.30 (mm) in the wide-angle end state. The amount of movement of the rear group G3R for correction is 0.216 (mm). In the telephoto end state, since the image stabilization coefficient K is 1.747 and the focal length f is 196.00 (mm), the movement amount of the rear group G3R for correcting the rotation blur of 0.20 ° is 0.392 (mm).
Table 3 below lists values of specifications of the zoom lens having the image stabilization function according to the present embodiment.

(表3)
[全体諸元]
広角端状態 中間焦点距離状態 望遠端状態
f = 18.30 〜 72.00 〜 196.00
FNO= 3.32 〜 5.33 〜 5.95
2ω = 78.14 〜 21.85 〜 8.13

[レンズデータ]
面 r d ν n
(第1レンズ群G1)
1 105.9610 2.0000 23.78 1.846660
2 71.3260 7.5407 81.54 1.496999
3 -1309.8498 0.2000
4 62.7400 5.6340 65.44 1.603001
5 172.3159 (d5)
(第2レンズ群G2)
6 3247.3313 0.2000 38.09 1.553890 非球面
7 350.0000 1.4000 46.62 1.816000
8 15.5519 7.2691
9 -38.1063 1.4000 46.62 1.816000
10 58.2259 0.2096
11 39.9359 4.0201 23.78 1.846660
12 -38.0549 0.6961
13 -28.7047 1.4000 46.62 1.816000
14 -92.9967 (d14)
(可変開口絞りS)
15 ∞ 0.5000
(第3レンズ群G3)
(前群G3F)
16 41.2957 2.7565 70.23 1.487490
17 -49.3120 0.4901
18 20.9493 4.6210 81.54 1.496999
19 -41.7503 1.4000 32.35 1.850260
20 170.2856 2.2624
(後群G3R)
21 -68.7491 1.8465 23.78 1.846660 非球面
22 -31.9511 1.4000 46.62 1.816000
23 107.0149 (d23)
(第4レンズ群G4)
24 54.7472 7.6656 59.46 1.583129 非球面
25 -19.8886 0.2000 非球面
26 -80.6973 3.5979 60.08 1.639999
27 -16.9513 1.6279 40.92 1.806098
28 447.1115 (B.f.)

[非球面データ]
第6面
κ b c d e
914152 1.46890E-05 -5.00490E-08 2.39330E-10 -5.14510E-13
第21面 非球面有効径 17.88mm
κ b c d e
-5.4970 2.63620E-06 -3.02920E-08 4.35670E-10 -1.87450E-12
第24面
κ b c d e
10.2988 -3.86840E-05 -2.10020E-08 -6.08770E-10 -1.90870E-12
第25面
κ b c d e
-0.5656 -1.50360E-05 -3.40270E-08 -2.15350E-10 -1.74120E-12

[可変間隔データ]
広角端状態 中間焦点距離状態 望遠端状態
f 18.30014 72.00011 196.00082
d5 2.00001 32.05608 59.13620
d14 31.55579 9.21847 1.00000
d23 9.40857 4.33178 3.16583
B.f. 39.00002 78.75226 89.56258
(Table 3)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 18.30 to 72.00 to 196.00
FNO = 3.32 to 5.33 to 5.95
2ω = 78.14 to 21.85 to 8.13

[Lens data]
Surface r d v n
(First lens group G1)
1 105.9610 2.0000 23.78 1.846660
2 71.3260 7.5407 81.54 1.496999
3 -1309.8498 0.2000
4 62.7400 5.6340 65.44 1.603001
5 172.3159 (d5)
(Second lens group G2)
6 3247.3313 0.2000 38.09 1.553890 Aspheric
7 350.0000 1.4000 46.62 1.816000
8 15.5519 7.2691
9 -38.1063 1.4000 46.62 1.816000
10 58.2259 0.2096
11 39.9359 4.0201 23.78 1.846660
12 -38.0549 0.6961
13 -28.7047 1.4000 46.62 1.816000
14 -92.9967 (d14)
(Variable aperture stop S)
15 ∞ 0.5000
(Third lens group G3)
(Front group G3F)
16 41.2957 2.7565 70.23 1.487490
17 -49.3120 0.4901
18 20.9493 4.6210 81.54 1.496999
19 -41.7503 1.4000 32.35 1.850 260
20 170.2856 2.2624
(Rear group G3R)
21 -68.7491 1.8465 23.78 1.846660 Aspheric
22 -31.9511 1.4000 46.62 1.816000
23 107.0149 (d23)
(Fourth lens group G4)
24 54.7472 7.6656 59.46 1.583129 Aspherical surface
25 -19.8886 0.2000 Aspheric surface
26 -80.6973 3.5979 60.08 1.639999
27 -16.9513 1.6279 40.92 1.806098
28 447.1115 (Bf)

[Aspherical data]
6th surface κ b c de
914152 1.46890E-05 -5.00490E-08 2.39330E-10 -5.14510E-13
21st surface Aspheric effective diameter 17.88mm
κ b c de
-5.4970 2.63620E-06 -3.02920E-08 4.35670E-10 -1.87450E-12
24th surface κ b c de
10.2988 -3.86840E-05 -2.10020E-08 -6.08770E-10 -1.90870E-12
25th surface κ b c de
-0.5656 -1.50360E-05 -3.40270E-08 -2.15350E-10 -1.74120E-12

[Variable interval data]
Wide-angle end state Intermediate focal length state Telephoto end state
f 18.30014 72.00011 196.00082
d5 2.00001 32.05608 59.13620
d14 31.55579 9.21847 1.00000
d23 9.40857 4.33178 3.16583
Bf 39.00002 78.75226 89.56258

図10(a)、及び図10(b)はそれぞれ、本発明の第3実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
図11は、本発明の第3実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。
図12(a)、及び図12(b)はそれぞれ、本発明の第3実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
FIGS. 10A and 10B are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the third example of the present invention, and 0.60, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.
FIG. 11 is a diagram illustrating various aberrations when the zoom lens having the image stabilization function according to the third example of the present invention is focused at infinity in the intermediate focal length state.
FIGS. 12A and 12B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens having the image stabilization function according to the third example of the present invention, and 0.20, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.

各諸収差図より本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態までの各焦点距離状態において、諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the zoom lens having the image stabilization function according to the present embodiment corrects various aberrations well in each focal length state from the wide-angle end state to the telephoto end state, and has excellent imaging performance. You can see that

(第4実施例)
図13は、本発明の第4実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。
本実施例に係る防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、可変開口絞りSと、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
(Fourth embodiment)
FIG. 13 is a diagram showing a lens configuration of a zoom lens having an image stabilization function according to the fourth example of the present invention.
The zoom lens having an image stabilization function according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a variable aperture stop S. The third lens group G3 having positive refractive power and the fourth lens group G4 having positive refractive power.

そして本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態への変倍に際し、第1レンズ群G1と第2レンズ群G2との空気間隔が増大し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第3レンズ群G3と第4レンズ群G4との空気間隔が減少するように、第1レンズ群G1と第3レンズ群G3と第4レンズ群G4が物体側へ移動し、第2レンズ群G2が移動する。   In the zoom lens having the image stabilization function according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state, and the second lens. The first lens group G1, the third lens group G3, and the third lens group G3 are arranged so that the air gap between the group G2 and the third lens group G3 is reduced and the air gap between the third lens group G3 and the fourth lens group G4 is reduced. The fourth lens group G4 moves to the object side, and the second lens group G2 moves.

第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と両凸形状の正レンズL12との接合レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL21と、両凹形状の負レンズL22と、両凸形状の正レンズL23と、物体側に凹面を向けた負メニスカスレンズL24とからなる。そして、第2レンズ群G2において最も物体側に位置する負メニスカスレンズL21は、物体側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the object side.

第3レンズ群G3は、物体側から順に、正の屈折力を有する前群G3Fと、負の屈折力を有する後群G3Rとから構成されており、後群G3Rのみを光軸と直交する方向へ移動させることによって防振、即ち手ぶれ補正を行う。
前群G3Fは、物体側から順に、両凸形状の正レンズL31と、両凸形状の正レンズL32と物体側に凹面を向けた負メニスカスレンズL33との接合レンズとからなる。
後群G3Rは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL34と両凹形状の負レンズL35との接合レンズからなる。そして、後群G3Rにおいて最も物体側に位置する正メニスカスレンズL34は、物体側のレンズ面を非球面形状とした非球面レンズである。
The third lens group G3 includes, in order from the object side, a front group G3F having a positive refractive power and a rear group G3R having a negative refractive power, and only the rear group G3R is orthogonal to the optical axis. The image stabilization, that is, the camera shake correction is performed by moving to the position.
The front group G3F includes, in order from the object side, a biconvex positive lens L31, a cemented lens of a biconvex positive lens L32, and a negative meniscus lens L33 having a concave surface facing the object side.
The rear group G3R includes, in order from the object side, a cemented lens of a positive meniscus lens L34 having a concave surface facing the object side and a biconcave negative lens L35. The positive meniscus lens L34 located closest to the object side in the rear group G3R is an aspheric lens having an aspheric lens surface on the object side.

第4レンズ群G4は、物体側から順に、両凸形状の正レンズL41と、物体側に凹面を向けた正メニスカスレンズL42と物体側に凹面を向けた負メニスカスレンズL43との接合レンズとからなる。そして、第4レンズ群G4において最も物体側に位置する両凸形状の正レンズL41は、両側のレンズ面を非球面形状とした両面非球面レンズである。   The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, and a cemented lens of a positive meniscus lens L42 having a concave surface facing the object side and a negative meniscus lens L43 having a concave surface facing the object side. Become. The biconvex positive lens L41 located closest to the object side in the fourth lens group G4 is a double-sided aspherical lens in which both lens surfaces are aspherical.

可変開口絞りSは、上述のように第2レンズ群G2と第3レンズ群G3との間に位置し、広角端状態から望遠端状態への変倍に際し、第3レンズ群G3の前群G3Fとともに移動する。
また、遠距離から近距離へのフォーカシングは、第2レンズ群G2を物体側へ移動させることによって行われる。
As described above, the variable aperture stop S is located between the second lens group G2 and the third lens group G3, and the front group G3F of the third lens group G3 is changed upon zooming from the wide-angle end state to the telephoto end state. Move with.
Further, focusing from a long distance to a short distance is performed by moving the second lens group G2 to the object side.

上述のようにぶれ補正は、後群G3Rのみを光軸と直交する方向へ移動させることによって行われる。本実施例に係る防振機能を有するズームレンズは、広角端状態において、防振係数Kは1.147、焦点距離fは20.63(mm)であるため、0.60°の回転ぶれを補正するための後群G3Rの移動量は0.188(mm)となる。また、望遠端状態においては、防振係数Kは1.976、焦点距離fは196.46(mm)であるため、0.20°の回転ぶれを補正するための後群G3Rの移動量は0.347(mm)となる。
以下の表4に、本実施例に係る防振機能を有するズームレンズの諸元の値を掲げる。
As described above, the shake correction is performed by moving only the rear group G3R in the direction orthogonal to the optical axis. In the zoom lens having the image stabilization function according to the present embodiment, the image stabilization coefficient K is 1.147 and the focal length f is 20.63 (mm) in the wide-angle end state. The amount of movement of the rear group G3R for correction is 0.188 (mm). In the telephoto end state, since the image stabilization coefficient K is 1.976 and the focal length f is 196.46 (mm), the movement amount of the rear group G3R for correcting the rotational blur of 0.20 ° is 0.347 (mm).
Table 4 below lists values of specifications of the zoom lens having the image stabilization function according to the present embodiment.

(表4)
[全体諸元]
広角端状態 中間焦点距離状態 望遠端状態
f = 20.63 〜 72.05 〜 196.46
FNO= 3.56 〜 5.27 〜 5.70
2ω = 71.47 〜 21.56 〜 8.02

[レンズデータ]
面 r d ν n
(第1レンズ群G1)
1 93.1885 1.5000 32.35 1.850260
2 54.0487 8.8553 82.52 1.497820
3 -263.5006 0.2000
4 45.9278 5.3255 82.52 1.497820
5 164.8751 (d 5)
(第2レンズ群G2)
6 69.8459 0.1380 38.09 1.553890 非球面
7 74.3360 1.4000 46.63 1.816000
8 13.3861 4.4109
9 -25.9378 1.4000 46.63 1.816000
10 75.9758 0.2000
11 33.1079 3.4027 23.78 1.846659
12 -26.3636 0.8226
13 -17.4698 1.4000 46.63 1.816000
14 -151.0383 (d14)
(可変開口絞りS)
15 ∞ 0.2000
(第3レンズ群G3)
(前群G3F)
16 41.1222 2.0987 60.08 1.639999
17 -70.8824 0.2000
18 19.6574 3.8836 82.52 1.497820
19 -25.0076 1.4000 25.42 1.805181
20 -120.5054 1.5000
(後群G3R)
21 -100.4883 2.8127 28.46 1.728250 非球面
22 -16.5477 1.4000 46.62 1.816000
23 61.8649 (d23)
(第4レンズ群G4)
24 70.4569 3.2409 54.52 1.676974 非球面
25 -18.8411 0.2000 非球面
26 -52.6818 2.7746 47.22 1.540720
27 -14.4027 1.4000 34.97 1.800999
28 -132.0069 (B.f.)

[非球面データ]
第6面
κ b c d e
1.0000 1.21650E-05 5.07790E-08 -8.31590E-10 6.35490E-12
第21面 非球面有効径 15.6mm
κ b c d e
-0.5201 1.10140E-05 3.88890E-08 -3.77380E-10 2.20940E-12
第24面
κ b c d e
-14.2400 -2.66160E-05 -1.00060E-07 -3.80740E-10 6.55080E-13
第25面
κ b c d e
0.3071 -6.09280E-06 -6.17870E-08 -8.42130E-10 2.52800E-12

[可変間隔データ]
広角端状態 中間焦点距離状態 望遠端状態
f 20.62988 72.05031 196.46091
d5 1.40201 27.41287 46.50963
d14 21.02277 8.78717 0.99999
d23 6.18019 3.84692 3.23042
B.f. 40.03100 68.41700 75.26872
(Table 4)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 20.63 to 72.05 to 196.46
FNO = 3.56 to 5.27 to 5.70
2ω = 71.47 to 21.56 to 8.02

[Lens data]
Surface r d v n
(First lens group G1)
1 93.1885 1.5000 32.35 1.850260
2 54.0487 8.8553 82.52 1.497820
3 -263.5006 0.2000
4 45.9278 5.3255 82.52 1.497820
5 164.8751 (d 5)
(Second lens group G2)
6 69.8459 0.1380 38.09 1.553890 Aspheric
7 74.3360 1.4000 46.63 1.816000
8 13.3861 4.4109
9 -25.9378 1.4000 46.63 1.816000
10 75.9758 0.2000
11 33.1079 3.4027 23.78 1.846659
12 -26.3636 0.8226
13 -17.4698 1.4000 46.63 1.816000
14 -151.0383 (d14)
(Variable aperture stop S)
15 ∞ 0.2000
(Third lens group G3)
(Front group G3F)
16 41.1222 2.0987 60.08 1.639999
17 -70.8824 0.2000
18 19.6574 3.8836 82.52 1.497820
19 -25.0076 1.4000 25.42 1.805181
20 -120.5054 1.5000
(Rear group G3R)
21 -100.4883 2.8127 28.46 1.728 250 Aspheric
22 -16.5477 1.4000 46.62 1.816000
23 61.8649 (d23)
(Fourth lens group G4)
24 70.4569 3.2409 54.52 1.676974 Aspheric
25 -18.8411 0.2000 Aspherical surface
26 -52.6818 2.7746 47.22 1.540720
27 -14.4027 1.4000 34.97 1.800999
28 -132.0069 (Bf)

[Aspherical data]
6th surface κ b c de
1.0000 1.21650E-05 5.07790E-08 -8.31590E-10 6.35490E-12
21st surface Aspheric effective diameter 15.6mm
κ b c de
-0.5201 1.10140E-05 3.88890E-08 -3.77380E-10 2.20940E-12
24th surface κ b c de
-14.2400 -2.66160E-05 -1.00060E-07 -3.80740E-10 6.55080E-13
25th surface κ b c de
0.3071 -6.09280E-06 -6.17870E-08 -8.42130E-10 2.52800E-12

[Variable interval data]
Wide-angle end state Intermediate focal length state Telephoto end state
f 20.62988 72.05031 196.46091
d5 1.40201 27.41287 46.50963
d14 21.02277 8.78717 0.99999
d23 6.18019 3.84692 3.23042
Bf 40.03100 68.41700 75.26872

図14(a)、及び図14(b)はそれぞれ、本発明の第4実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
図15は、本発明の第4実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。
図16(a)、及び図16(b)はそれぞれ、本発明の第4実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。
FIGS. 14 (a) and 14 (b) are graphs showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the fourth example of the present invention, and 0.60, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.
FIG. 15 is a diagram illustrating various aberrations when the zoom lens having the image stabilization function according to the fourth embodiment of the present invention is focused at infinity in the intermediate focal length state.
FIGS. 16A and 16B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens having the image stabilization function according to the fourth example of the present invention, and 0.20, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed for rotational shake of °.

各諸収差図より本実施例に係る防振機能を有するズームレンズは、広角端状態から望遠端状態までの各焦点距離状態において、諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the zoom lens having the image stabilization function according to the present embodiment corrects various aberrations well in each focal length state from the wide-angle end state to the telephoto end state, and has excellent imaging performance. You can see that

以下の表5に、上記各実施例に係る防振機能を有するズームレンズについて、各条件式の値を示す。   Table 5 below shows the values of the conditional expressions for the zoom lens having the image stabilization function according to each of the above examples.

(表5)
実施例1 実施例2 実施例3 実施例4
(1) f1/fw 5.470 5.408 5.682 3.944
(2) f3/fw 2.926 2.660 2.744 1.841
(3,4) 0.0001×(h/2) 0.0007 0.0008 0.0009 0.0008
|X50| 0.0017 0.0019 0.0019 0.0027
|Xm| 0.0271 0.0312 0.0284 0.0469
0.01×(h/2) 0.074 0.075 0.089 0.078
(5) |X50|/|Xm| 0.063 0.061 0.067 0.058
(6) f3R/f3F -1.419 -1.501 -1.746 -1.693
(7) f3/f4 1.367 1.143 1.050 0.907
(8) Bfw/fw 2.060 2.056 2.131 1.940
(9) Ds/f3 0.207 0.228 0.240 0.244
(10) fw/Re -0.631 -0.660 0.041 -0.156
(Table 5)
Example 1 Example 2 Example 3 Example 4
(1) f1 / fw 5.470 5.408 5.682 3.944
(2) f3 / fw 2.926 2.660 2.744 1.841
(3,4) 0.0001 x (h / 2) 0.0007 0.0008 0.0009 0.0008
| X50 | 0.0017 0.0019 0.0019 0.0027
| Xm | 0.0271 0.0312 0.0284 0.0469
0.01 x (h / 2) 0.074 0.075 0.089 0.078
(5) | X50 | / | Xm | 0.063 0.061 0.067 0.058
(6) f3R / f3F -1.419 -1.501 -1.746 -1.693
(7) f3 / f4 1.367 1.143 1.050 0.907
(8) Bfw / fw 2.060 2.056 2.131 1.940
(9) Ds / f3 0.207 0.228 0.240 0.244
(10) fw / Re -0.631 -0.660 0.041 -0.156

以上より上記各実施例によれば、防振機能を有するズームレンズであって、デジタル一眼レフカメラに好適な長いバックフォーカスと、10倍程度のズーム比を有し、さらに広角端状態において70°以上の画角を有する小型のズームレンズを提供することができる。   As described above, according to each of the above embodiments, the zoom lens has an anti-vibration function, has a long back focus suitable for a digital single-lens reflex camera, a zoom ratio of about 10 times, and 70 ° in the wide-angle end state. A small zoom lens having the above angle of view can be provided.

なお、本発明の実施例として4群構成のレンズ系を示したが、該4群を含む5群及びそれ以上の群構成のレンズ系も、本発明の効果を内在したレンズ系であることは言うまでもない。また、各レンズ群内の構成においても、実施例の構成に付加レンズを加えただけのレンズ群も、本発明の効果を内在した同等のレンズ群であることは言うまでもない。
また、本発明の防振機能を有するズームレンズは、デジタル一眼レフカメラに用いることに限られず、フィルムカメラにも用いることができることは言うまでもない。
Although a four-group lens system is shown as an example of the present invention, a lens system having a group structure of five or more groups including the four groups is also a lens system having the effects of the present invention. Needless to say. In addition, in the configuration in each lens group, it goes without saying that a lens group in which an additional lens is added to the configuration in the embodiment is an equivalent lens group in which the effects of the present invention are inherent.
Needless to say, the zoom lens having the image stabilization function of the present invention is not limited to use in a digital single-lens reflex camera, but can also be used in a film camera.

本発明の第1実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。It is a figure which shows the lens structure of the zoom lens which has a vibration proof function which concerns on 1st Example of this invention. (a)、及び(b)はそれぞれ、本発明の第1実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。(A) and (b) are diagrams showing various aberrations at the time of focusing on infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the first embodiment of the present invention, and a rotation blur of 0.60 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image. 本発明の第1実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。FIG. 6 is a diagram illustrating various aberrations at the time of focusing on infinity in the intermediate focal length state of the zoom lens having an image stabilization function according to the first example of the present invention. (a)、及び(b)はそれぞれ、本発明の第1実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。(A) and (b) are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens having the image stabilization function according to the first embodiment of the present invention, and a rotation blur of 0.20 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image. 本発明の第2実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。It is a figure which shows the lens structure of the zoom lens which has an anti-vibration function based on 2nd Example of this invention. (a)、及び(b)はそれぞれ、本発明の第2実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。(A) and (b) are diagrams showing various aberrations when focusing at infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the second embodiment of the present invention, and a rotation blur of 0.60 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image. 本発明の第2実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。FIG. 12 is a diagram illustrating various aberrations when the zoom lens having the image stabilization function according to the second example of the present invention is focused at infinity in the intermediate focal length state. (a)、及び(b)はそれぞれ、本発明の第2実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。(A) and (b) are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the zoom lens having the image stabilization function according to the second embodiment of the present invention, and a rotation blur of 0.20 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image. 本発明の第3実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。It is a figure which shows the lens structure of the zoom lens which has a vibration proof function which concerns on 3rd Example of this invention. (a)、及び(b)はそれぞれ、本発明の第3実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。(A) and (b) are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the third embodiment of the present invention, and a rotation blur of 0.60 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image. 本発明の第3実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。FIG. 12 is a diagram illustrating various aberrations when the zoom lens having the image stabilization function according to the third example of the present invention is focused at infinity in the intermediate focal length state. (a)、及び(b)はそれぞれ、本発明の第3実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。FIGS. 9A and 9B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens having the image stabilization function according to the third example of the present invention, and a rotation blur of 0.20 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image. 本発明の第4実施例に係る防振機能を有するズームレンズのレンズ構成を示す図である。It is a figure which shows the lens structure of the zoom lens which has an anti-vibration function based on 4th Example of this invention. (a)、及び(b)はそれぞれ、本発明の第4実施例に係る防振機能を有するズームレンズの広角端状態における無限遠合焦時の諸収差図、及び0.60°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。(A) and (b) are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom lens having the image stabilization function according to the fourth embodiment of the present invention, and a rotation blur of 0.60 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image. 本発明の第4実施例に係る防振機能を有するズームレンズの中間焦点距離状態における無限遠合焦時の諸収差図である。FIG. 10 is a diagram illustrating various aberrations when the zoom lens having an image stabilization function according to Example 4 of the present invention is focused at infinity in the intermediate focal length state. (a)、及び(b)はそれぞれ、本発明の第4実施例に係る防振機能を有するズームレンズの望遠端状態における無限遠合焦時の諸収差図、及び0.20°の回転ぶれに対してぶれ補正を行った際のメリディオナル横収差図である。(A) and (b) are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens having the image stabilization function according to the fourth example of the present invention, and a rotational blur of 0.20 °, respectively. FIG. 6 is a meridional lateral aberration diagram when shake correction is performed on the image.

符号の説明Explanation of symbols

G1 第1レンズ群
G2 第2レンズ群
G3 第3レンズ群
G3F 前群
G3R 後群
G4 第4レンズ群
S 可変開口絞り
W 広角端状態
T 望遠端状態
I 像面
G1 First lens group G2 Second lens group G3 Third lens group G3F Front group G3R Rear group G4 Fourth lens group S Variable aperture stop W Wide-angle end state T Telephoto end state I Image surface

Claims (18)

物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とからなり、前記レンズ群どうしの間隔を変化させて変倍を行うズームレンズにおいて、
前記第3レンズ群は、物体側から順に、正の屈折力を有する前群と、負の屈折力を有する後群とからなり、
前記後群のみを光軸と直交する方向へ移動させることによって結像位置の変位を補正し、
前記後群は、両凹形状の負レンズと正メニスカスレンズとの接合レンズからなり、
前記後群中の少なくとも一つのレンズ面は、近軸曲率半径を有する球面に比して、光軸から周辺へ向かって正の屈折力が強くなる又は負の屈折力が弱くなる形状の非球面であり、
以下の条件式を満足することを特徴とする防振機能を有するズームレンズ。
3.7 < f1/fw < 7.0
−2.3 < f3R/f3F < −1.2
ただし、
f1:前記第1レンズ群の焦点距離
fw:広角端状態における前記ズームレンズの焦点距離
f3F:前記前群の焦点距離
f3R:前記後群の焦点距離
In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power consists of a group, in changing the interval between the lens group zoom lens to perform zooming,
The third lens group includes, in order from the object side, a front group having a positive refractive power and a rear group having a negative refractive power,
Correct the displacement of the imaging position by moving only the rear group in the direction perpendicular to the optical axis,
The rear group consists of a cemented lens of a biconcave negative lens and a positive meniscus lens,
At least one lens surface in the rear group has an aspherical surface in which the positive refractive power increases toward the periphery from the optical axis or the negative refractive power decreases as compared with a spherical surface having a paraxial radius of curvature. And
A zoom lens having an anti-vibration function characterized by satisfying the following conditional expression:
3.7 <f1 / fw <7.0
-2.3 <f3R / f3F <-1.2
However,
f1: Focal length fw of the first lens group fw: Focal length of the zoom lens in the wide-angle end state
f3F: Focal length of the front group
f3R: focal length of the rear group
以下の条件式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するズームレンズ。
1.6 < f3/fw < 3.5
ただし、
f3 :前記第3レンズ群の焦点距離
The zoom lens having an image stabilization function according to claim 1, wherein the following conditional expression is satisfied.
1.6 <f3 / fw <3.5
However,
f3: focal length of the third lens group
以下の条件式を満足することを特徴とする請求項1又は請求項2に記載の防振機能を有するズームレンズ。
0.0001×(h/2) < |X50| < 0.01×(h/2)
0.0001×(h/2) < |Xm| < 0.01×(h/2)
|X50|/|Xm| < 1
ただし、
h :前記非球面の有効径
X50:前記非球面の光軸から有効径5割の高さにおける近軸曲率半径と非球面形状との偏差量
Xm :前記非球面の光軸から有効径10割の高さにおける近軸曲率半径と非球面形状との偏差量
The zoom lens having an anti-vibration function according to claim 1 or 2, wherein the following conditional expression is satisfied.
0.0001 × (h / 2) <| X50 | <0.01 × (h / 2)
0.0001 × (h / 2) <| Xm | <0.01 × (h / 2)
| X50 | / | Xm | <1
However,
h: Effective diameter of the aspheric surface X50: Deviation amount Xm of paraxial radius of curvature and aspheric shape at an effective diameter of 50% from the optical axis of the aspheric surface Xm: Effective diameter of 100% from the optical axis of the aspheric surface Of deviation between paraxial radius of curvature and aspheric shape at height
前記第4レンズ群中の最も物体側のレンズは正レンズであり、当該正レンズの像側レンズ面は像側に凸形状であることを特徴とする請求項1から請求項3のいずれか1項に記載の防振機能を有するズームレンズ。   The lens on the most object side in the fourth lens group is a positive lens, and the image side lens surface of the positive lens has a convex shape on the image side. A zoom lens having the anti-vibration function according to item. 広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第3レンズ群と前記第4レンズ群とが物体側へ移動することを特徴とする請求項1から請求項4のいずれか1項に記載の防振機能を有するズームレンズ。   5. The zoom lens according to claim 1, wherein the first lens group, the third lens group, and the fourth lens group move toward the object side during zooming from the wide-angle end state to the telephoto end state. A zoom lens having an image stabilization function according to any one of the preceding claims. 広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔が、望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔よりも大きいことを特徴とする請求項1から請求項5のいずれか1項に記載の防振機能を有するズームレンズ。   The air gap between the third lens group and the fourth lens group in the wide-angle end state is larger than the air gap between the third lens group and the fourth lens group in the telephoto end state. A zoom lens having the image stabilization function according to any one of claims 1 to 5. 以下の条件式を満足することを特徴とする請求項1から請求項のいずれか1項に記載の防振機能を有するズームレンズ。
0.90 < f3/f4 < 1.60
ただし、
f4 :前記第4レンズ群の焦点距離
The zoom lens having an anti-vibration function according to any one of claims 1 to 6 , wherein the following conditional expression is satisfied.
0.90 <f3 / f4 <1.60
However,
f4: focal length of the fourth lens group
以下の条件式を満足することを特徴とする請求項1から請求項のいずれか1項に記載の防振機能を有するズームレンズ。
1.80 < Bfw/fw < 3.00
ただし、
Bfw:広角端状態におけるバックフォーカス
The zoom lens having an image stabilization function according to any one of claims 1 to 7 , wherein the following conditional expression is satisfied.
1.80 <Bfw / fw <3.00
However,
Bfw: Back focus in the wide-angle end state
以下の条件式を満足することを特徴とする請求項1から請求項のいずれか1項に記載の防振機能を有するズームレンズ。
−0.90 < fw/Re < 0.20
ただし、
Re:前記ズームレンズ中の最も像側のレンズ面の曲率半径
The zoom lens having an anti-vibration function according to any one of claims 1 to 8 , wherein the following conditional expression is satisfied.
−0.90 <fw / Re <0.20
However,
Re: radius of curvature of the lens surface closest to the image side in the zoom lens
前記後群中の最も物体側のレンズ面は像側に凸形状であることを特徴とする請求項1から請求項のいずれか1項に記載の防振機能を有するズームレンズ。 The zoom lens system with a vibration reduction function as claimed in any one of claims 9, wherein the lens surface closest to the object side in the rear group is convex toward the image side. 前記第4レンズ群における最も物体側のレンズは、少なくとも1つのレンズ面が非球面である両凸形状の正レンズであることを特徴とする請求項1から請求項10のいずれか1項に記載の防振機能を有するズームレンズ。 The most object side lens in the fourth lens group, according to any one of claims 1 to 10, wherein at least one lens surface is a positive lens of biconvex shape which is aspherical Zoom lens with anti-vibration function. 前記第4レンズ群は少なくとも1つの接合レンズを有し、当該接合レンズの接合面は像側に凸形状であることを特徴とする請求項1から請求項11のいずれか1項に記載の防振機能を有するズームレンズ。 The fourth lens group has at least one cemented lens, anti described joint surface of the cemented lens of claims 1, which is a convex toward the image side in any one of claims 11 Zoom lens with vibration function. 遠距離から近距離へのフォーカシングは、前記第2レンズ群を物体側へ移動させることによって行われることを特徴とする請求項1から請求項12のいずれか1項に記載の防振機能を有するズームレンズ。 The anti-vibration function according to any one of claims 1 to 12 , wherein focusing from a long distance to a short distance is performed by moving the second lens group to the object side. Zoom lens. 少なくとも1つの非球面を有する非球面レンズを3枚有することを特徴とする請求項1から請求項13のいずれか1項に記載の防振機能を有するズームレンズ。 The zoom lens system with a vibration reduction function according to any one of claims 13 claim 1, characterized in that it comprises three aspherical lens having at least one aspheric surface. 物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とからなるズームレンズの変倍方法であって
前記第3レンズ群は、物体側から順に、正の屈折力を有する前群と、負の屈折力を有する後群とからなり
前記後群は、両凹形状の負レンズと正メニスカスレンズとの接合レンズからなり、
前記後群中の少なくとも1つのレンズ面は、近軸曲率半径を有する球面に比して、光軸から周辺へ向かって正の屈折力が強くなる又は負の屈折力が弱くなる形状の非球面であり、
前記後群を光軸と直交する方向へ移動させることによって結像位置の変位を補正し、
以下の条件式を満足することを特徴とするズームレンズの変倍方法。
3.7 < f1/fw < 7.0
−2.3 < f3R/f3F < −1.2
ただし、
f1:前記第1レンズ群の焦点距離
fw:広角端状態における前記ズームレンズの焦点距離
f3F:前記前群の焦点距離
f3R:前記後群の焦点距離
In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power A zooming method of a zoom lens comprising a group,
The third lens group includes, in order from the object, a front group having positive refractive power, and a rear group having negative refractive power,
The rear group consists of a cemented lens of a biconcave negative lens and a positive meniscus lens,
At least one lens surface in the rear group has an aspherical shape in which the positive refractive power increases toward the periphery from the optical axis or the negative refractive power decreases as compared with a spherical surface having a paraxial radius of curvature. And
The displacement of the imaging position is corrected by moving the rear group in a direction perpendicular to the optical axis,
A zoom lens zooming method characterized by satisfying the following conditional expression:
3.7 <f1 / fw <7.0
-2.3 <f3R / f3F <-1.2
However,
f1: Focal length fw of the first lens group fw: Focal length of the zoom lens in the wide-angle end state
f3F: Focal length of the front group
f3R: focal length of the rear group
広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第2レンズ群との空気間隔が増大し、前記第2レンズ群と前記第3レンズ群との空気間隔が減少し、前記第3レンズ群と前記第4レンズ群との空気間隔が減少することを特徴とする請求項15に記載のズームレンズの変倍方法。 During zooming from the wide-angle end state to the telephoto end state, the air gap between the first lens group and the second lens group increases, and the air gap between the second lens group and the third lens group decreases. The zoom lens zooming method according to claim 15 , wherein an air gap between the third lens group and the fourth lens group is reduced. 広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第3レンズ群と前記第4レンズ群とが物体側へ移動することを特徴とする請求項15又は請求項16に記載のズームレンズの変倍方法。 Angle end state to the telephoto end state, to claim 15 or claim 16 and wherein the first lens group and the third lens group and the fourth lens group is characterized in that moves toward the object side A zooming method of the zoom lens described. 前記第2レンズ群と前記第3レンズ群との間に可変開口絞りを配置し、
広角端状態から望遠端状態への変倍に際し、前記可変開口絞りは前記前群とともに移動することを特徴とする請求項15から請求項17のいずれか1項に記載のズームレンズの変倍方法。
A variable aperture stop is disposed between the second lens group and the third lens group;
The zoom lens zooming method according to any one of claims 15 to 17 , wherein the variable aperture stop moves together with the front group when zooming from the wide-angle end state to the telephoto end state. .
JP2005102731A 2004-10-01 2005-03-31 Zoom lens with anti-vibration function Active JP4635688B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2005102731A JP4635688B2 (en) 2005-03-31 2005-03-31 Zoom lens with anti-vibration function
US11/237,743 US7253965B2 (en) 2004-10-01 2005-09-29 Zoom lens system with vibration reduction
EP18191670.1A EP3444654A3 (en) 2004-10-01 2005-09-30 Zoom lens system with vibration reduction
EP05256159.4A EP1643293B1 (en) 2004-10-01 2005-09-30 Zoom lens system with vibration reduction
EP10182069.4A EP2325688B1 (en) 2004-10-01 2005-09-30 Zoom lens system with vibration reduction
EP10182297.1A EP2325680B1 (en) 2004-10-01 2005-09-30 Zoom lens system with vibration reduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005102731A JP4635688B2 (en) 2005-03-31 2005-03-31 Zoom lens with anti-vibration function

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2008246710A Division JP4905429B2 (en) 2008-09-25 2008-09-25 Zoom lens

Publications (3)

Publication Number Publication Date
JP2006284763A JP2006284763A (en) 2006-10-19
JP2006284763A5 JP2006284763A5 (en) 2008-05-15
JP4635688B2 true JP4635688B2 (en) 2011-02-23

Family

ID=37406793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005102731A Active JP4635688B2 (en) 2004-10-01 2005-03-31 Zoom lens with anti-vibration function

Country Status (1)

Country Link
JP (1) JP4635688B2 (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5201809B2 (en) * 2006-07-06 2013-06-05 キヤノン株式会社 Zoom lens and imaging apparatus having the same
US7609456B2 (en) * 2006-12-18 2009-10-27 Hoya Corporation Standard zoom lens system
JP5064837B2 (en) * 2007-03-01 2012-10-31 キヤノン株式会社 Zoom lens with anti-vibration function
WO2009034713A1 (en) * 2007-09-12 2009-03-19 Panasonic Corporation Zoom lens system, imaging device, and camera
US8212913B2 (en) 2007-09-12 2012-07-03 Panasonic Corporation Zoom lens system, imaging device and camera
JP5242192B2 (en) * 2008-02-20 2013-07-24 オリンパスイメージング株式会社 Zoom lens and imaging apparatus using the same
US8238038B2 (en) 2008-08-08 2012-08-07 Tamron Co., Ltd. High variable power zoom lens
JP5239083B2 (en) * 2008-08-08 2013-07-17 株式会社タムロン High magnification zoom lens
JP5239082B2 (en) * 2008-08-08 2013-07-17 株式会社タムロン High magnification zoom lens
JP5239081B2 (en) * 2008-08-08 2013-07-17 株式会社タムロン High magnification zoom lens
JP4905429B2 (en) * 2008-09-25 2012-03-28 株式会社ニコン Zoom lens
JP2010266534A (en) 2009-05-12 2010-11-25 Tamron Co Ltd Large-aperture zoom lens
JP5477154B2 (en) 2009-05-22 2014-04-23 リコーイメージング株式会社 High zoom ratio zoom lens system
JP5448574B2 (en) 2009-05-26 2014-03-19 キヤノン株式会社 Zoom lens and imaging apparatus having the same
JP2011028259A (en) * 2009-07-03 2011-02-10 Panasonic Corp Zoom lens system, imaging device and camera
JP2011248220A (en) * 2010-05-28 2011-12-08 Tamron Co Ltd High variable power zoom lens
JP2011248219A (en) * 2010-05-28 2011-12-08 Tamron Co Ltd High variable power zoom lens
US9140905B2 (en) 2010-12-21 2015-09-22 Samsung Electronics Co., Ltd. Vibration proof zoom lens and photographing apparatus having the same
CN104272163B (en) 2012-02-29 2016-11-09 株式会社尼康 Varifocal optical system and optical device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0560971A (en) * 1991-08-30 1993-03-12 Canon Inc Rear focus zoom lens
JP2003295057A (en) * 2002-04-04 2003-10-15 Canon Inc Zoom lens and optical equipment having the same
JP2004199000A (en) * 2002-12-20 2004-07-15 Nikon Corp Zoom lens
JP2004258509A (en) * 2003-02-27 2004-09-16 Nikon Corp Zoom lens
JP2004258247A (en) * 2003-02-25 2004-09-16 Nikon Corp Zoom lens
WO2004111698A1 (en) * 2003-06-13 2004-12-23 Matsushita Electric Industrial Co., Ltd. Zoom lens, imaging device, and camera having imaging device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0560971A (en) * 1991-08-30 1993-03-12 Canon Inc Rear focus zoom lens
JP2003295057A (en) * 2002-04-04 2003-10-15 Canon Inc Zoom lens and optical equipment having the same
JP2004199000A (en) * 2002-12-20 2004-07-15 Nikon Corp Zoom lens
JP2004258247A (en) * 2003-02-25 2004-09-16 Nikon Corp Zoom lens
JP2004258509A (en) * 2003-02-27 2004-09-16 Nikon Corp Zoom lens
WO2004111698A1 (en) * 2003-06-13 2004-12-23 Matsushita Electric Industrial Co., Ltd. Zoom lens, imaging device, and camera having imaging device

Also Published As

Publication number Publication date
JP2006284763A (en) 2006-10-19

Similar Documents

Publication Publication Date Title
JP4635688B2 (en) Zoom lens with anti-vibration function
JP4806915B2 (en) Zoom lens with anti-vibration function
JP4120647B2 (en) Zoom lens with anti-vibration function
JP5407119B2 (en) Variable magnification optical system, optical apparatus, and variable magnification optical system magnification method
JP5458477B2 (en) Variable magnification optical system, optical apparatus, and variable magnification optical system magnification method
JP5581730B2 (en) Variable magnification optical system, optical device
JP5176410B2 (en) Variable magnification optical system, optical apparatus, and variable magnification optical system magnification method
JP5135723B2 (en) Zoom lens having image stabilization function, image pickup apparatus, image stabilization method for zoom lens, and zooming method for zoom lens
JP5321608B2 (en) Variable magnification optical system, optical device
JP4356040B2 (en) Long zoom lens with anti-vibration function
JP2008203471A (en) Zoom lens, optical equipment and imaging method
JP4146134B2 (en) Zoom lens
JP4387641B2 (en) Anti-shake zoom lens
JP2018036364A (en) Zoom lens and imaging device having the same
JP2006267676A (en) Variable power optical system with image blur correcting function
JP7218813B2 (en) Variable magnification optical system and optical equipment
JP4807388B2 (en) Zoom lens with anti-vibration function
JP4227360B2 (en) Zoom lens
JP4905429B2 (en) Zoom lens
JP2005292338A (en) Zoom lens
JP2015031951A (en) Zoom lens, optical device and method for manufacturing zoom lens
JP4388784B2 (en) Zoom lens with anti-vibration function
JP2004226644A (en) Zoom lens
JP2015087680A (en) Zoom lens system
JP2013097143A (en) Zoom lens system

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080304

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080328

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100803

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20101004

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20101026

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20101108

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131203

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4635688

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131203

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250