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JP2010079311A - Wide-angle zoom lens system - Google Patents

Wide-angle zoom lens system Download PDF

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Publication number
JP2010079311A
JP2010079311A JP2009288796A JP2009288796A JP2010079311A JP 2010079311 A JP2010079311 A JP 2010079311A JP 2009288796 A JP2009288796 A JP 2009288796A JP 2009288796 A JP2009288796 A JP 2009288796A JP 2010079311 A JP2010079311 A JP 2010079311A
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lens
lens group
wide
angle zoom
focal length
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Naoko Nagakura
直子 長倉
Takayuki Ito
孝之 伊藤
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Hoya Corp
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Hoya Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
    • G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wide-angle zoom lens system that has a half field angle of 40° or more at the short focal distance end, the lens system being sufficiently small and thin (reduced in accommodating length). <P>SOLUTION: The wide-angle zoom lens system includes, in order from an object side, a first lens group with negative refractive power, a second lens group with positive refractive power, and a third lens group with positive refractive power. In zooming from the short focal distance end to the long focal distance end, they move so that the spacing between the first and the second lens groups may decrease and the spacing between the second and the third lens groups may increase. The wide-angle zoom lens system satisfies conditional expression (1). (1):-0.4<D<SB>W</SB><-0.1, wherein D<SB>W</SB>is a distortion aberration of diagonal image height (the maximum image height) at the short focal distance end. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、写真用カメラ、特にデジタルカメラに用いられる、最も物体側に負の第１レンズ群を位置させる広角ズームレンズ系に関する。   The present invention relates to a wide-angle zoom lens system that is used in a photographic camera, particularly a digital camera, and that positions a negative first lens unit closest to the object side.

この種のネガティブリーディングタイプの広角ズームレンズ系は一般的に、広角化すると大型化し、さらに諸収差をより良好に補正しようとすると一層大型化する。すなわち、広角化すると前玉径が増大し、収差補正を良好にしようとすればレンズ枚数が増える。   In general, this type of negative reading type wide-angle zoom lens system increases in size when the angle is increased, and further increases in size when various aberrations are corrected more favorably. That is, when the angle is increased, the front lens diameter is increased, and if the aberration correction is to be improved, the number of lenses increases.

特開２００２-２７７７４０号公報JP 2002-277740 A

本発明は、短焦点距離端での半画角が４０゜を超えるデジタルカメラ用の広角ズームレンズ系であって、十分な小型化、薄型化（収納長の短縮）を達成することを目的とする。   The present invention is a wide-angle zoom lens system for a digital camera having a half field angle of more than 40 ° at the short focal length end, and an object thereof is to achieve sufficient size reduction and thinning (reduction of storage length). To do.

本発明は、デジタルカメラでは、歪曲収差の補正は撮像後の画像処理で可能であり、光学的に行う必要はないとの着眼に基づき、研究の結果完成されたものである。   The present invention has been completed as a result of research based on the viewpoint that in a digital camera, distortion can be corrected by image processing after imaging and it is not necessary to perform optically.

本発明は、物体側から順に位置する、負の屈折力を有する第１レンズ群と、正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レンズ群とからなり、短焦点距離端から長焦点距離端への変倍に際し、第１レンズ群と第２レンズ群の間隔は減少し、第２レンズ群と第３レンズ群の間隔は増大するように移動する広角ズームレンズ系において、次の条件式（１）を満足することを特徴としている。
（１）-０．４＜ＤW＜-０．1
但し、
ＤW：短焦点距離端における対角像高（最大像高）の歪曲収差、
である。 The present invention includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power, which are located in order from the object side. When zooming from the focal length end to the long focal length end, the wide-angle zoom lens moves so that the distance between the first lens group and the second lens group decreases and the distance between the second lens group and the third lens group increases. The system is characterized in that the following conditional expression (1) is satisfied.
(1) -0.4 <D W <-0.1
However,
D W : distortion of diagonal image height (maximum image height) at the short focal length end,
It is.

本発明の広角ズームレンズ系は、次の条件式（２）ないし（４）を満足することが好ましい。
（２）-０．６＜ｆW／ｆ1G-1＜-０．３、ｆ1G-1＜０
（３）０．１＜ｆW／ｆ1G-2＜０．２、ｆ1G-2＞０
（４）０．５＜ＳＦ１＜１．０
但し、
ｆW：短焦点距離端の全系の焦点距離、
ｆ1G-1：第１レンズ群の最も物体側の第１レンズの焦点距離、
ｆ1G-2：第１レンズ群の物体側から数えて２番目の第２レンズの焦点距離、
ＳＦ１：第１レンズ群の第１レンズのシェイピング・ファクター、
ＳＦ１＝（ｒ１＋ｒ２）／（ｒ１−ｒ２）
ｒ１： 第１レンズの第１面の曲率半径、
ｒ２： 第１レンズの第２面の曲率半径、
である。 The wide-angle zoom lens system of the present invention preferably satisfies the following conditional expressions (2) to (4).
(2) -0.6 <f W / f 1G-1 <-0.3, f 1G-1 <0
(3) 0.1 <f W / f 1G-2 <0.2, f 1G-2 > 0
(4) 0.5 <SF1 <1.0
However,
f W : focal length of the entire system at the short focal length end,
f 1G-1 : Focal length of the first lens closest to the object side in the first lens group,
f 1G-2 : Focal length of the second second lens counted from the object side of the first lens group,
SF1: Shaping factor of the first lens of the first lens group,
SF1 = (r1 + r2) / (r1-r2)
r1: radius of curvature of the first surface of the first lens,
r2: radius of curvature of the second surface of the first lens,
It is.

また、本発明の広角ズームレンズ系は、次の条件式（５）を満足することが好ましい。
（５）１．７＜Ｎ１
但し、
Ｎ１：第１レンズ群の第１レンズの屈折率、
である。 Moreover, it is preferable that the wide-angle zoom lens system of the present invention satisfies the following conditional expression (5).
(5) 1.7 <N1
However,
N1: Refractive index of the first lens in the first lens group,
It is.

第１レンズ群は、具体的には、物体側から順に位置する１枚の負レンズと１枚の正レンズから構成することができる。   Specifically, the first lens group can be composed of one negative lens and one positive lens positioned in order from the object side.

第３レンズ群は、正単レンズからなるフォーカスレンズ群とすることができる。   The third lens group can be a focus lens group composed of a positive single lens.

本発明は、電子撮像装置の態様では、以上の広角ズームレンズ系と、該広角ズームレンズ系による像を結像させる電子撮像素子とを有していて、該電子撮像素子で光電変換した画像データを画像処理して歪曲収差を補正する過程を備えている。   In an aspect of the electronic imaging apparatus, the present invention includes the above wide-angle zoom lens system and an electronic imaging device that forms an image by the wide-angle zoom lens system, and image data photoelectrically converted by the electronic imaging device. The image processing is performed to correct distortion.

本発明の広角ズームレンズ系は、次の条件式（６）を満足することが好ましい。
（６）１．０＜ｄ1G／ｆW＜６．０
但し、
ｄ1G：第１レンズ群のレンズ群厚、
である。 The wide-angle zoom lens system of the present invention preferably satisfies the following conditional expression (6).
(6) 1.0 <d 1G / f W <6.0
However,
d 1G : lens group thickness of the first lens group,
It is.

第１レンズ群の像側には、全体として正の焦点距離を有する１以上の可動レンズ群を配置することが好ましい。そして、次の条件式（７）を満足することが好ましい。
（７）３．０＜ｄＷ1G-2G／ｆW＜６．０
但し、
ｄＷ1G-2G：短焦点距離端における第１レンズ群と第２レンズ群の群間隔、
である。 It is preferable to arrange one or more movable lens groups having a positive focal length as a whole on the image side of the first lens group. It is preferable that the following conditional expression (7) is satisfied.
(7) 3.0 <dW 1G-2G / f W <6.0
However,
dW 1G-2G : Group interval between the first lens group and the second lens group at the short focal length end,
It is.

本発明によれば、残存歪曲収差の補正を画像処理に任せた結果、小型薄型の広角ズームレンズ系を得ることができる。   According to the present invention, as a result of leaving correction of residual distortion to image processing, a small and thin wide-angle zoom lens system can be obtained.

本発明による広角ズームレンズ系の第１実施例の短焦点距離端におけるレンズ構成図である。It is a lens block diagram in the short focal distance end of 1st Example of the wide-angle zoom lens system by this invention. 図１のレンズ構成の諸収差図である。FIG. 2 is a diagram illustrating various aberrations of the lens configuration in FIG. 1. 同第１実施例の長焦点距離端におけるレンズ構成図である。It is a lens block diagram in the long focal distance end of the 1st Example. 図３のレンズ構成の諸収差図である。FIG. 4 is a diagram illustrating various aberrations of the lens configuration in FIG. 3. 本発明による広角ズームレンズ系の第２実施例の短焦点距離端におけるレンズ構成図である。It is a lens block diagram in the short focal distance end of 2nd Example of the wide angle zoom lens system by this invention. 図５のレンズ構成の諸収差図である。FIG. 6 is a diagram illustrating various aberrations of the lens configuration in FIG. 5. 同第２実施例の長焦点距離端におけるレンズ構成図である。It is a lens block diagram in the long focal distance end of the 2nd Example. 図７のレンズ構成の諸収差図である。FIG. 8 is a diagram illustrating various aberrations of the lens configuration in FIG. 7. 本発明による広角ズームレンズ系の第３実施例の短焦点距離端におけるレンズ構成図である。It is a lens block diagram in the short focal distance end of 3rd Example of the wide-angle zoom lens system by this invention. 図９のレンズ構成の諸収差図である。FIG. 10 is a diagram illustrating various aberrations of the lens configuration in FIG. 9. 同第３実施例の長焦点距離端におけるレンズ構成図である。It is a lens block diagram in the long focal distance end of the said 3rd Example. 図１１のレンズ構成の諸収差図である。FIG. 12 is a diagram illustrating various aberrations of the lens configuration in FIG. 11. 本発明による広角ズームレンズ系のレンズ構成例及びその簡易移動図である。2 is a lens configuration example of a wide-angle zoom lens system according to the present invention and its simplified movement diagram.

図１３は、本発明による広角ズームレンズ系のレンズ群配置とズーム軌跡の一例を示している。この例は、３群タイプのネガティブリーディング型広角ズームレンズ系であって、物体側から順に、負の第１レンズ群１０と、絞りＳと、正の第２レンズ群２０と、正の第３レンズ群３０とからなっている。この３群ズームレンズは、短焦点距離端（Ｗ）から長焦点距離端（Ｔ）へのズーミングに際し、前記第１レンズ群１０と第２レンズ群２０の間隔は減少し、第２レンズ群２０と第３レンズ群３０の間隔は増大するように移動する。絞りＳは、第２レンズ群２０と一緒に移動する。フォーカシングは第１レンズ群１０または第３レンズ群３０で行う。ＣＧは、撮像素子の前方に位置する赤外カットフィルタ等のカバーガラス（平行平面板）である。   FIG. 13 shows an example of the lens group arrangement and zoom locus of the wide-angle zoom lens system according to the present invention. This example is a three-group type negative reading type wide-angle zoom lens system, and in order from the object side, a negative first lens group 10, an aperture S, a positive second lens group 20, and a positive third lens group. It consists of a lens group 30. In the three-group zoom lens, during the zooming from the short focal length end (W) to the long focal length end (T), the distance between the first lens group 10 and the second lens group 20 decreases, and the second lens group 20 And the distance between the third lens group 30 is increased. The diaphragm S moves together with the second lens group 20. Focusing is performed by the first lens group 10 or the third lens group 30. CG is a cover glass (parallel flat plate) such as an infrared cut filter positioned in front of the image sensor.

以上は３群タイプであるが、全体として正のパワーを有する第２レンズ群以降を、１群とし、あるいは３群以上としても、ネガティブリーディング型の広角ズームレンズ系は成立する。   Although the above is a three-group type, a negative reading type wide-angle zoom lens system can be established even if the second lens group and the subsequent lenses having a positive power as a whole are grouped as one group or three or more groups.

条件式（１）は、本発明の広角ズームレンズ系が有する歪曲収差の大きさを規定している。条件式（１）の上限を超えると、像面の周辺の解像には有利であるが、広角化と同時に歪曲収差を補正しようとすると、レンズ構成枚数の増大を招き小型化が達成できない。条件式（１）の下限を超えると、像面の周辺像が過度に圧縮され解像が劣化する。   Conditional expression (1) defines the magnitude of the distortion that the wide-angle zoom lens system of the present invention has. If the upper limit of conditional expression (1) is exceeded, it is advantageous for resolving the periphery of the image plane. However, if distortion is corrected at the same time as widening the angle, the number of lens components increases, and miniaturization cannot be achieved. When the lower limit of conditional expression (1) is exceeded, the peripheral image on the image plane is excessively compressed and the resolution deteriorates.

条件式（２）は、負の焦点距離を有する第１レンズ群の負の第１レンズ（最も物体側のレンズ）の焦点距離を規定している。
条件式（２）の上限を超えると、広角化には有利であるが、負の第１レンズのパワーが小さくなりすぎて、収差を補正するには第１レンズ群厚の増大を招き大型化する。
条件式（２）の下限を超えて広角化すると、負の第１レンズのパワーが大きくなりすぎて、第１レンズ群内の球面収差、コマ収差、非点収差が補正過剰となり、変倍時の収差の変動が大きくなる。 Conditional expression (2) defines the focal length of the negative first lens (most object side lens) of the first lens group having a negative focal length.
If the upper limit of conditional expression (2) is exceeded, it is advantageous for widening the angle, but the power of the negative first lens becomes too small, and in order to correct aberrations, the thickness of the first lens group increases and the size increases. To do.
If the angle is widened beyond the lower limit of conditional expression (2), the power of the negative first lens becomes too large, and the spherical aberration, coma aberration, and astigmatism in the first lens group become overcorrected. The fluctuation of the aberration becomes large.

条件式（３）は、第１レンズ群の正の第２レンズ（物体側から数えて２番目のレンズ）の焦点距離を規定している。
条件式（３）の上限を超えると、正の第２レンズのパワーが大きくなり、第１レンズ群内で収差のバランスをとるには、条件式（２）の下限を超えた領域との組み合わせとなり、諸収差の補正が過剰となり、変倍時の収差の変動が大きくなる。
条件式（３）の下限を超えると、広角化には有利であるが、正の第２レンズのパワーが小さくなりすぎて、収差を補正するには第１レンズ群厚の増大を招き大型化する。 Conditional expression (3) defines the focal length of the positive second lens (second lens counted from the object side) of the first lens group.
When the upper limit of conditional expression (3) is exceeded, the power of the positive second lens increases, and in order to balance aberrations in the first lens group, a combination with a region exceeding the lower limit of conditional expression (2) Accordingly, correction of various aberrations becomes excessive, and fluctuations in aberrations during zooming increase.
If the lower limit of conditional expression (3) is exceeded, it is advantageous for widening the angle, but the power of the positive second lens becomes too small, and in order to correct aberrations, the thickness of the first lens group increases and the size increases. To do.

条件式（４）は、第１レンズ群の負の第１レンズの形状に関する条件である。
条件式（４）の上限を超えると、第１レンズの物体側の面が凸面となり、歪曲収差の補正には有利であるが、半画角４０゜を超える広角化を達成しようとすると、球面収差、コマ収差、非点収差の補正は困難になり、あるいはレンズ枚数が増え、前玉径が増大し、レンズ全長が大きくなる。本発明は歪曲収差を小さく補正する必要はないので上限以下が望ましい。
条件式（４）の下限を超えると、物体側の凹面の曲率が大きくなりマイナスの歪曲収差が大きくなりすぎてしまう。画像処理で歪曲収差は補正できると先述したが、マイナスの大きな歪曲収差が発生してしまうと、像面の周辺になるにしたがって画像が圧縮されて、たとえ歪曲収差は画像処理で補正されたとしても、像面の周辺の解像が劣化し、あまり大きなマイナスの歪曲収差を発生させるべきでない。 Conditional expression (4) is a condition relating to the shape of the negative first lens of the first lens group.
If the upper limit of conditional expression (4) is exceeded, the object-side surface of the first lens becomes a convex surface, which is advantageous for correcting distortion. However, if it is attempted to achieve a wide angle exceeding 40 °, the spherical surface Correction of aberration, coma and astigmatism becomes difficult, or the number of lenses increases, the front lens diameter increases, and the total lens length increases. In the present invention, since it is not necessary to correct the distortion to be small, the upper limit or less is desirable.
When the lower limit of conditional expression (4) is exceeded, the curvature of the concave surface on the object side becomes large, and the negative distortion becomes too large. As described above, distortion can be corrected by image processing. However, if large negative distortion occurs, the image is compressed as it approaches the periphery of the image plane, even if distortion is corrected by image processing. However, the resolution around the image plane should be deteriorated, and a very large negative distortion should not be generated.

条件式（５）は、第１レンズ群の負の第１レンズの屈折率に関する条件である。
条件式（５）の下限を超えると、負の第１レンズの周縁厚（コバ厚）が増大し、第１レンズ群厚が大きくなる。また第１レンズの第２面（凹面）の曲率が大きくなって、球面収差、コマ収差、非点収差の補正が困難になる。 Conditional expression (5) is a condition relating to the refractive index of the negative first lens of the first lens group.
When the lower limit of conditional expression (5) is exceeded, the peripheral thickness (edge thickness) of the negative first lens increases and the first lens group thickness increases. Further, the curvature of the second surface (concave surface) of the first lens becomes large, and it becomes difficult to correct spherical aberration, coma aberration, and astigmatism.

条件式（６）は、第１レンズ群の群厚に関する条件である。
条件式（６）の上限を超えると、レンズ枚数を多くすることができるから歪曲収差を含む諸収差の補正には有利であるが、第１レンズ群厚が増加して収納長の短縮を図ることができない。
条件式（６）の下限を超えると、負の第１レンズと正の第２レンズの間隔が小さくなりすぎて、第１レンズ群内の球面収差、コマ収差、非点収差の補正が困難となる。 Conditional expression (6) is a condition relating to the group thickness of the first lens group.
If the upper limit of conditional expression (6) is exceeded, the number of lenses can be increased, which is advantageous for correcting various aberrations including distortion, but the first lens group thickness is increased to shorten the storage length. I can't.
If the lower limit of conditional expression (6) is exceeded, the distance between the negative first lens and the positive second lens will be too small, making it difficult to correct spherical aberration, coma and astigmatism in the first lens group. Become.

条件式（７）は、第１レンズ群の像側に、全体として正の焦点距離を有する１以上の可動レンズ群を配置する場合の好ましい第１レンズ群と第２レンズ群の間隔を規定している。
条件式（７）の上限を超えると、収差補正には有利であるが、大型化する。 Conditional expression (7) defines a preferable distance between the first lens group and the second lens group when one or more movable lens groups having a positive focal length as a whole are arranged on the image side of the first lens group. ing.
Exceeding the upper limit of conditional expression (7) is advantageous for aberration correction, but increases in size.

次に具体的な実施例を示す。諸収差図中、球面収差で表される色収差（軸上色収差）図及び倍率色収差図中のｄ線、ｇ線、Ｃ線はそれぞれの波長に対する収差であり、Ｓはサジタル、Ｍはメリディオナルである。
また、表中のＦNOはＦナンバー、ｆは全系の焦点距離、Ｗは半画角（゜）、ｆB はバックフォーカス、ｒは曲率半径、ｄはレンズ厚またはレンズ間隔、Ｎd はｄ線に対する屈折率、νはアッベ数を示す。
また、回転対称非球面は次式で定義される。
x=cy2/[1+[1-(1+K)c2y2]1/2]+A4y4+A6y6+A8y8+A10y10+A12y12・・・
（但し、cは曲率（１／ｒ）、ｙは光軸からの高さ、Ｋは円錐係数、Ａ４、Ａ６、Ａ８、・・・・・は各次数の非球面係数） Next, specific examples will be described. In the various aberration diagrams, the d-line, g-line, and C-line in the chromatic aberration (axial chromatic aberration) diagram and the lateral chromatic aberration diagram represented by spherical aberration are aberrations for the respective wavelengths, S is sagittal, and M is meridional. .
In the table, F NO is the F number, f is the focal length of the entire system, W is the half angle of view (°), f B is the back focus, r is the radius of curvature, d is the lens thickness or lens interval, and N d is Refractive index with respect to d-line, ν indicates Abbe number.
The rotationally symmetric aspheric surface is defined by the following equation.
x = cy 2 / [1+ [1- (1 + K) c 2 y 2 ] 1/2 ] + A4y 4 + A6y 6 + A8y 8 + A10y 10 + A12y 12 ...
(Where c is the curvature (1 / r), y is the height from the optical axis, K is the conic coefficient, A4, A6, A8,... Are the aspheric coefficients of each order)

（実施例１）
図１ないし図４は本発明の広角ズームレンズ系の第１実施例を示している。図１と図３はそれぞれ、短焦点距離端と長焦点距離端のレンズ構成を示し、図２と図４はそれぞれ図１と図３のレンズ構成における諸収差図である。表１はその数値データである。面No. １〜４は第１レンズ群１０、面No. ５〜９は第２レンズ群２０、面No. １０〜１１は第３レンズ群３０、面No. １２〜１３はカバーガラスＣＧであり、絞りＳは第２レンズ群（第５面）の前方（物体側面）0.72mmの位置にある。第１レンズ群１０は、物体側から順に、両凹単レンズと正単レンズからなり、第２レンズ群２０は、物体側から順に、両凸レンズと、両凸レンズと両凹レンズの貼合せレンズからなり、第３レンズ群３０は正単レンズからなっている。 Example 1
1 to 4 show a first embodiment of the wide-angle zoom lens system of the present invention. 1 and 3 show the lens configurations at the short focal length end and the long focal length end, respectively, and FIGS. 2 and 4 are graphs showing various aberrations in the lens configurations of FIGS. 1 and 3, respectively. Table 1 shows the numerical data. Surface Nos. 1-4 are the first lens group 10, surface Nos. 5-9 are the second lens group 20, surface Nos. 10-11 are the third lens group 30, and surface Nos. 12-13 are the cover glass CG. Yes, the stop S is at a position 0.72 mm in front (object side surface) of the second lens group (fifth surface). The first lens group 10 is composed of a biconcave single lens and a positive single lens in order from the object side, and the second lens group 20 is composed of a biconvex lens and a cemented lens of a biconvex lens and a biconcave lens in order from the object side. The third lens group 30 is composed of a positive single lens.

（表１）
FNO= 1:2.7-3.5-4.6
f=3.70-6.70-10.62
W= 45.4-24.5-15.5
fB= 3.38-3.38-3.38
Dw=-0.22
面No. ｒ ｄ Nd ν
1 -58.889 0.70 1.85000 44.7
2 6.872 2.02
3* 27.228 2.07 1.84666 23.8
4* -65.570 17.08-7.17-2.65
5* 6.641 2.28 1.69680 55.5
6* -24.249 0.17
7 8.076 1.68 1.76602 48.6
8 -8.076 0.87 1.68256 29.5
9 3.388 2.36-5.41-9.39
10 22.325 2.11 1.58913 61.2
11 -12.802 2.27
12 ∞ 1.69 1.51633 64.1
13 ∞
*は回転対称非球面。
非球面データ（表示していない非球面係数は0.00である。）：
面No. Ｋ Ａ４ Ａ６ Ａ８
3 0.00 -0.19845×10-3 0.90745×10-5 0.24067×10-6
4 0.00 -0.40772×10-3 0.10344×10-4 ‐
5 0.00 -0.40941×10-3 -0.43363×10-4 0.88573×10-5
6 0.00 0.21015×10-3 0.47200×10-4 ‐ (Table 1)
F NO = 1: 2.7-3.5-4.6
f = 3.70-6.70-10.62
W = 45.4-24.5-15.5
f B = 3.38-3.38-3.38
D w = -0.22
Surface No. r d N d ν
1 -58.889 0.70 1.85000 44.7
2 6.872 2.02
3 * 27.228 2.07 1.84666 23.8
4 * -65.570 17.08-7.17-2.65
5 * 6.641 2.28 1.69680 55.5
6 * -24.249 0.17
7 8.076 1.68 1.76602 48.6
8 -8.076 0.87 1.68256 29.5
9 3.388 2.36-5.41-9.39
10 22.325 2.11 1.58913 61.2
11 -12.802 2.27
12 ∞ 1.69 1.51633 64.1
13 ∞
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00):
Surface No. K A4 A6 A8
3 0.00 -0.19845 × 10 -3 0.90745 × 10 -5 0.24067 × 10 -6
4 0.00 -0.40772 × 10 -3 0.10344 × 10 -4 -
5 0.00 -0.40941 × 10 -3 -0.43363 × 10 -4 0.88573 × 10 -5
6 0.00 0.21015 × 10 -3 0.47200 × 10 -4 -

（実施例２）
図５ないし図８は本発明の広角ズームレンズ系の第２実施例を示している。図５と図７はそれぞれ、短焦点距離端と長焦点距離端のレンズ構成を示し、図６と図８はそれぞれ図５と図７のレンズ構成における諸収差図である。表２はその数値データである。基本的なレンズ構成は実施例１と同じであり、絞りＳは第２レンズ群（第５面）の前方（物体側面）1.94mmの位置にある。 (Example 2)
5 to 8 show a second embodiment of the wide-angle zoom lens system of the present invention. FIGS. 5 and 7 show the lens configurations at the short focal length end and the long focal length end, respectively. FIGS. 6 and 8 are graphs showing various aberrations in the lens configurations of FIGS. 5 and 7, respectively. Table 2 shows the numerical data. The basic lens configuration is the same as that of the first embodiment, and the diaphragm S is located at a position 1.94 mm in front of the second lens group (fifth surface) (object side surface).

（表２）
FNO= 1:2.7-3.6-4.8
f=3.70-6.70-10.62
W= 42.8-24.5-15.7
fB= 3.38-3.38-3.38
Dw=-0.15
面No. ｒ ｄ Nd ν
1 -131.848 0.70 1.85000 44.6
2 6.931 2.82
3* -127.668 2.16 1.84666 23.8
4* -20.797 18.84-8.55-3.87
5* 6.384 1.52 1.69680 55.5
6* -25.361 0.17
7 7.828 2.47 1.56258 64.9
8 -7.828 0.84 1.66929 30.2
9 3.366 2.36-6.23-11.29
10 10.135 2.11 1.58913 61.2
11 -17.089 2.27
12 ∞ 1.69 1.51633 64.1
13 ∞
*は回転対称非球面。
非球面データ（表示していない非球面係数は0.00である。）：
面No. Ｋ Ａ４ Ａ６ Ａ８
3 0.00 -0.22943×10-3 0.13648×10-4 0.16766×10-6
4 0.00 -0.36094×10-3 0.11517×10-4 ‐
5 0.00 -0.36230×10-3 0.23585×10-4 0.27299×10-6
6 0.00 0.12428×10-3 0.41944×10-4 ‐ (Table 2)
F NO = 1: 2.7-3.6-4.8
f = 3.70-6.70-10.62
W = 42.8-24.5-15.7
f B = 3.38-3.38-3.38
D w = -0.15
Surface No. r d N d ν
1 -131.848 0.70 1.85000 44.6
2 6.931 2.82
3 * -127.668 2.16 1.84666 23.8
4 * -20.797 18.84-8.55-3.87
5 * 6.384 1.52 1.69680 55.5
6 * -25.361 0.17
7 7.828 2.47 1.56258 64.9
8 -7.828 0.84 1.66929 30.2
9 3.366 2.36-6.23-11.29
10 10.135 2.11 1.58913 61.2
11 -17.089 2.27
12 ∞ 1.69 1.51633 64.1
13 ∞
* Is a rotationally symmetric aspheric surface.
Aspheric data (Aspheric coefficient not shown is 0.00):
Surface No. K A4 A6 A8
3 0.00 -0.22943 × 10 -3 0.13648 × 10 -4 0.16766 × 10 -6
4 0.00 -0.36094 × 10 -3 0.11517 × 10 -4 -
5 0.00 -0.36 230 × 10 -3 0.23585 × 10 -4 0.27299 × 10 -6
6 0.00 0.12428 × 10 -3 0.41944 × 10 -4 -

（実施例３）
図９ないし図１２は本発明の広角ズームレンズ系の第３実施例を示している。図９と図１１はそれぞれ、短焦点距離端と長焦点距離端のレンズ構成を示し、図１０と図１２はそれぞれ図９と図１１のレンズ構成における諸収差図である。表３はその数値データである。基本的なレンズ構成は実施例１と同じであり、絞りＳは第２レンズ群（第５面）の前方（物体側面）1.12mmの位置にある。 (Example 3)
9 to 12 show a third embodiment of the wide-angle zoom lens system of the present invention. 9 and 11 show the lens configurations at the short focal length end and the long focal length end, respectively. FIGS. 10 and 12 are graphs showing various aberrations in the lens configurations of FIGS. 9 and 11, respectively. Table 3 shows the numerical data. The basic lens configuration is the same as that of the first embodiment, and the stop S is located at a position 1.12 mm in front (object side surface) of the second lens group (fifth surface).

（表３）
FNO= 1:2.7-3.6-4.7
f=3.70-6.70-10.62
W= 48.8-24.9-15.6
fB= 3.39-3.39-3.39
Dw=-0.31
面No. ｒ ｄ Nd ν
1 -35.852 0.70 1.76263 51.3
2 6.872 1.80
3* 18.864 1.95 1.84666 23.8
4* 150.104 16.11-7.13-3.04
5* 6.812 2.09 1.69680 55.5
6* -28.921 0.17
7 9.040 1.62 1.85000 45.6
8 -9.040 1.12 1.69981 28.6
9 3.631 2.36-5.58-9.78
10 20.498 2.11 1.58913 61.2
11 -11.977 2.27
12 ∞ 1.69 1.51633 64.1
13 ∞
*は回転対称非球面。
非球面データ（表示していない非球面係数は0.00である。）：
面No. Ｋ Ａ４ Ａ６ Ａ８
3 0.00 -0.33487×10-3 0.93635×10-5 0.26049×10-6
4 0.00 -0.52973×10-3 0.13061×10-4 ‐
5 0.00 -0.30776×10-3 -0.83738×10-5 0.84618×10-5
6 0.00 0.38718×10-3 0.85640×10-4 ‐ (Table 3)
F NO = 1: 2.7-3.6-4.7
f = 3.70-6.70-10.62
W = 48.8-24.9-15.6
f B = 3.39-3.39-3.39
D w = -0.31
Surface No. r d N d ν
1 -35.852 0.70 1.76263 51.3
2 6.872 1.80
3 * 18.864 1.95 1.84666 23.8
4 * 150.104 16.11-7.13-3.04
5 * 6.812 2.09 1.69680 55.5
6 * -28.921 0.17
7 9.040 1.62 1.85000 45.6
8 -9.040 1.12 1.69981 28.6
9 3.631 2.36-5.58-9.78
10 20.498 2.11 1.58913 61.2
11 -11.977 2.27
12 ∞ 1.69 1.51633 64.1
13 ∞
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00):
Surface No. K A4 A6 A8
3 0.00 -0.33487 × 10 -3 0.93635 × 10 -5 0.26049 × 10 -6
4 0.00 -0.52973 × 10 -3 0.13061 × 10 -4 -
5 0.00 -0.30776 × 10 -3 -0.83738 × 10 -5 0.84618 × 10 -5
6 0.00 0.38718 × 10 -3 0.85640 × 10 -4 -

各実施例の各条件式に対する値を表４に示す。
（表４）
実施例１ 実施例２ 実施例３
条件式（１） -0.22 -0.15 -0.31
条件式（２） -0.51 -0.48 -0.49
条件式（３） 0.16 0.13 0.15
条件式（４） 0.79 0.90 0.68
条件式（５） 1.85000 1.85000 1.76263
条件式（６） 1.29 1.53 1.20
条件式（７） 4.62 5.09 4.34 Table 4 shows values for each conditional expression in each example.
(Table 4)
Example 1 Example 2 Example 3
Conditional expression (1) -0.22 -0.15 -0.31
Conditional expression (2) -0.51 -0.48 -0.49
Conditional expression (3) 0.16 0.13 0.15
Conditional expression (4) 0.79 0.90 0.68
Conditional expression (5) 1.85000 1.85000 1.76263
Conditional expression (6) 1.29 1.53 1.20
Conditional expression (7) 4.62 5.09 4.34

Claims (6)

物体側から順に位置する、負の屈折力を有する第１レンズ群と、正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レンズ群とからなり、
短焦点距離端から長焦点距離端への変倍に際し、第１レンズ群と第２レンズ群の間隔は減少し、第２レンズ群と第３レンズ群の間隔は増大するように移動する広角ズームレンズ系において、
次の条件式（１）を満足することを特徴とする広角ズームレンズ系。
（１）-０．４＜ＤW＜-０．1
但し、
ＤW：短焦点距離端における対角像高（最大像高）の歪曲収差。 A first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power, which are located in order from the object side;
When zooming from the short focal length end to the long focal length end, the wide angle zoom moves so that the distance between the first lens group and the second lens group decreases and the distance between the second lens group and the third lens group increases. In the lens system,
A wide-angle zoom lens system characterized by satisfying the following conditional expression (1):
(1) -0.4 <D W < -0.1
However,
D W : Distortion of diagonal image height (maximum image height) at the short focal length end. 請求項１記載の広角ズームレンズ系において、次の条件式（２）ないし（４）を満足する広角ズームレンズ系。
（２）-０．６＜ｆW／ｆ1G-1＜-０．３、ｆ1G-1＜０
（３）０．１＜ｆW／ｆ1G-2＜０．２、ｆ1G-2＞０
（４）０．５＜ＳＦ１＜１．０
但し、
ｆW：短焦点距離端の全系の焦点距離、
ｆ1G-1：第１レンズ群の最も物体側の第１レンズの焦点距離、
ｆ1G-2：第１レンズ群の物体側から数えて２番目の第２レンズの焦点距離、
ＳＦ１：第１レンズ群の第１レンズのシェイピング・ファクター、
ＳＦ１＝（ｒ１＋ｒ２）／（ｒ１−ｒ２）
ｒ１： 第１レンズの第１面の曲率半径、
ｒ２： 第１レンズの第２面の曲率半径。 2. The wide-angle zoom lens system according to claim 1, wherein the wide-angle zoom lens system satisfies the following conditional expressions (2) to (4).
(2) -0.6 <f W / f 1G-1 <-0.3, f 1G-1 <0
(3) 0.1 <f W / f 1G-2 <0.2, f 1G-2 > 0
(4) 0.5 <SF1 <1.0
However,
f W : focal length of the entire system at the short focal length end,
f 1G-1 : Focal length of the first lens closest to the object side in the first lens group,
f 1G-2 : Focal length of the second second lens counted from the object side of the first lens group,
SF1: Shaping factor of the first lens of the first lens group,
SF1 = (r1 + r2) / (r1-r2)
r1: radius of curvature of the first surface of the first lens,
r2: radius of curvature of the second surface of the first lens. 請求項２記載の広角ズームレンズ系において、次の条件式（５）を満足する広角ズームレンズ系。
（５）１．７＜Ｎ１
但し、
Ｎ１：第１レンズ群の第１レンズの屈折率。 The wide-angle zoom lens system according to claim 2, wherein the wide-angle zoom lens system satisfies the following conditional expression (5).
(5) 1.7 <N1
However,
N1: Refractive index of the first lens in the first lens group. 請求項１ないし３のいずれか１項記載の広角ズームレンズ系において、第１レンズ群は、物体側から順に位置する１枚の負レンズと１枚の正レンズからなる広角ズームレンズ系。 The wide-angle zoom lens system according to any one of claims 1 to 3, wherein the first lens group includes one negative lens and one positive lens that are sequentially positioned from the object side. 請求項１ないし４のいずれか１項記載の広角ズームレンズ系において、第３レンズ群は、正単レンズからなるフォーカスレンズ群である広角ズームレンズ系。 The wide-angle zoom lens system according to any one of claims 1 to 4, wherein the third lens group is a focus lens group composed of a positive single lens. 請求項１ないし５のいずれか１項記載の広角ズームレンズ系と、該広角ズームレンズ系による像を結像させる電子撮像素子とを有し、該電子撮像素子で光電変換した画像データを画像処理して歪曲収差を補正する過程を有する電子撮像装置。 6. A wide-angle zoom lens system according to claim 1, and an electronic image pickup device for forming an image by the wide-angle zoom lens system, and image processing is performed on image data photoelectrically converted by the electronic image pickup device. An electronic imaging apparatus having a process of correcting distortion.
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