JP2004354980A - Wide angle zoom lens system - Google Patents

Wide angle zoom lens system Download PDF

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JP2004354980A
JP2004354980A JP2004125834A JP2004125834A JP2004354980A JP 2004354980 A JP2004354980 A JP 2004354980A JP 2004125834 A JP2004125834 A JP 2004125834A JP 2004125834 A JP2004125834 A JP 2004125834A JP 2004354980 A JP2004354980 A JP 2004354980A
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lens
lens group
focal length
wide
angle zoom
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JP4324508B2 (en
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Masakazu Koori
雅和 小織
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Pentax Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a wide angle zoom lens system whose viewing angle at a short focal distance end is ≥80° and whose variable power ratio exceeds 2.5 so as to be suitable for a digital single lens reflex camera having a screen size whose diagonal image height is 14.24 mm. <P>SOLUTION: The wide angle zoom lens system is constituted of a first negative lens group, a second positive lens group, a third negative lens group and a fourth positive lens group in order from an object side, and when zooming is performed from the short focal distance end to a long focal distance end, a space between the first lens group and the second lens group is decreased, and a space between the second lens group and the third lens group is increased and a space between the third lens group and the fourth lens group is decreased, and the second lens group, the third lens group and the fourth lens group are respectively moved to the object side, and conditional expressions such as (1) 1.2< ¾f1/fw¾<2.0, (2) 1.5<f2/fw<2.2, (3) 2.5<¾f3/fw¾<3.6 and (4) 3.2<f4/fw<4.7 are satisfied when f1 means the focal distance (f1<0 and f3<0) of a i-th lens(i=1 to 4) and fw means the focal distance of a whole system at the short focal distance end. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、一眼レフカメラ用として好適な広角ズームレンズ系に関し、ライカ版より小型の撮像素子（例えばＣＣＤ）を用いたデジタル一眼レフカメラ用に好適な広角ズームレンズ系に関する。   The present invention relates to a wide-angle zoom lens system suitable for a single-lens reflex camera, and to a wide-angle zoom lens system suitable for a digital single-lens reflex camera using an image sensor (for example, CCD) smaller than a Leica version.

銀塩フィルムを用いる一眼レフカメラにおいて、最も普及しているライカ版の画面サイズ（３６mm×２４mm）を有するＣＣＤは現在でも非常に高価である。そこで、像高比でライカ版サイズの０．７倍程度のサイズを有するＣＣＤがデジタル一眼レフカメラでよく使われている。画面サイズが小さくなると、広い画角を得るためには、より焦点距離の短いレンズが必要になる。   In a single-lens reflex camera using a silver salt film, a CCD having the most popular Leica screen size (36 mm × 24 mm) is still very expensive. Therefore, a CCD having an image height ratio of about 0.7 times the Leica size is often used in a digital single lens reflex camera. As the screen size becomes smaller, a lens with a shorter focal length is required to obtain a wider angle of view.

短焦点距離端の画角が８０゜以上に達する広角ズームレンズ系は既に存在するが、変倍比（ズーム比）が２倍程度しかない。特開２００１-３１８３１４号公報や、特開２００１-８３４２１号公報に記載の広角ズームレンズ系はこの例である。また、特開２０００-３３８３９７号公報や特開平１１-１７４３２８号公報に記載のものは、ズーム比が３倍程度あるが、画角が十分でない。   There are already wide-angle zoom lens systems in which the angle of view at the short focal length end reaches 80 ° or more, but the zoom ratio is only about twice. The wide-angle zoom lens system described in Japanese Patent Laid-Open No. 2001-318314 and Japanese Patent Laid-Open No. 2001-83421 is an example of this. Further, those described in Japanese Patent Laid-Open Nos. 2000-338397 and 11-174328 have a zoom ratio of about 3 times, but the angle of view is not sufficient.

特開２００１-３１８３１４号公報JP 2001-318314 A 特開２００１-８３４２１号公報Japanese Patent Laid-Open No. 2001-83421 特開２０００-３３８３９７号公報JP 2000-338397 A 特開平１１-１７４３２８号公報JP-A-11-174328

本発明は、対角像高１４．２４mmの画面サイズのデジタル一眼レフカメラ用に適した、短焦点距離端の画角が８０゜以上であり、変倍比が２．５を超える広角ズームレンズ系を得ることを目的とする。   The present invention is a wide-angle zoom lens suitable for a digital single-lens reflex camera having a screen size with a diagonal image height of 14.24 mm, an angle of view at the short focal length end of 80 ° or more, and a zoom ratio exceeding 2.5. The goal is to obtain a system.

本発明による広角ズームレンズ系は、物体側から順に、負の第１レンズ群、正の第２レンズ群、負の第３レンズ群及び正の第４レンズ群からなり、短焦点距離端から長焦点距離端へのズーミングに際し、第１レンズ群と第２レンズ群との間隔は減少し、第２レンズ群と第３レンズ群との間隔は拡大し、第３レンズ群と第４レンズ群との間隔は減少し、第２、第３、第４レンズ群はそれぞれ物体側に移動し、次の条件式（１）乃至（４）を満足することを特徴としている。
（１）１．２＜｜ｆ１／ｆｗ｜＜２．０
（２）１．５＜ｆ２／ｆｗ＜２．２
（３）２．５＜｜ｆ３／ｆｗ｜＜３．６
（４）３．２＜ｆ４／ｆｗ＜４．７
但し、
ｆｉ；第ｉレンズ（ｉ＝１〜４）の焦点距離（ｆ１＜０、ｆ３＜０）、
ｆｗ；短焦点距離端における全系の焦点距離、
である。 The wide-angle zoom lens system according to the present invention includes, in order from the object side, a negative first lens group, a positive second lens group, a negative third lens group, and a positive fourth lens group, and is long from the short focal length end. During zooming to the focal length end, the distance between the first lens group and the second lens group decreases, the distance between the second lens group and the third lens group increases, and the third lens group and the fourth lens group , The second, third, and fourth lens groups move to the object side, and satisfy the following conditional expressions (1) to (4).
(1) 1.2 <| f1 / fw | <2.0
(2) 1.5 <f2 / fw <2.2
(3) 2.5 <| f3 / fw | <3.6
(4) 3.2 <f4 / fw <4.7
However,
fi: focal length of the i-th lens (i = 1 to 4) (f1 <0, f3 <0),
fw: focal length of the entire system at the short focal length end,
It is.

第２レンズ群と第４レンズ群は、ズーミング中に一体に移動させることが可能であり、一体に移動させると、機械構成が簡単になり、偏心誤差が生じにくい。   The second lens group and the fourth lens group can be moved together during zooming. When the second lens group and the fourth lens group are moved together, the mechanical configuration becomes simple and an eccentricity error hardly occurs.

本発明の広角ズームレンズ系は、加えて、次の条件式（５）を満足することが好ましい。
（５） １．０５＜ＴLw／ＴLt＜１．３０
但し、
ＴLw；短焦点距離端における第１レンズ群の物体側の面から像面までの距離、
ＴLt；長焦点距離端における第１レンズ群の物体側の面から像面までの距離、
である。 In addition, the wide-angle zoom lens system of the present invention preferably satisfies the following conditional expression (5).
(5) 1.05 <T Lw / T Lt <1.30
However,
T Lw ; distance from the object side surface of the first lens group to the image plane at the short focal length end;
T Lt ; distance from the object side surface of the first lens unit to the image plane at the long focal length end,
It is.

本発明の広角ズームレンズ系は、第１レンズ群中に、少なくとも１面の非球面を含ませることにより、特に短焦点距離端における非点収差と歪曲収差を良好に補正することができる。   The wide-angle zoom lens system of the present invention can satisfactorily correct astigmatism and distortion particularly at the short focal length end by including at least one aspheric surface in the first lens group.

また、第４レンズ群には、少なくとも１枚の正レンズと、少なくとも１枚の負レンズを配置し、その最も物体側の面を非球面とすると、全ズーム域における収差補正が容易である。   Further, if at least one positive lens and at least one negative lens are arranged in the fourth lens group, and the most object side surface thereof is an aspherical surface, it is easy to correct aberrations in the entire zoom range.

開口絞りは、第２レンズ群の物体側に位置させ、ズーミング時に第２レンズ群と一体に移動させると、テレセントリック性の向上に有利である。   If the aperture stop is positioned on the object side of the second lens group and moved integrally with the second lens group during zooming, it is advantageous for improving the telecentricity.

また、第４レンズ群の最も像側のレンズを、像側に凸面を向けた正レンズとすると、テレセントリック性を向上させることができる。   Further, if the most image side lens of the fourth lens group is a positive lens having a convex surface directed to the image side, the telecentricity can be improved.

さらに、短焦点距離端から長焦点距離端へのズーミングに際し、第１レンズ群は一旦像側に移動し、その後物体側に移動すると好ましい。   Further, when zooming from the short focal length end to the long focal length end, it is preferable that the first lens unit temporarily moves to the image side and then moves to the object side.

本発明によれば、対角像高１４．２４mmの画面サイズのデジタル一眼レフカメラ用に適した、短焦点距離端の画角が８０゜以上であり、変倍比が２．５を超える広角ズームレンズ系を得ることができる。   According to the present invention, the angle of view at the short focal length end which is suitable for a digital single-lens reflex camera having a diagonal image height of 14.24 mm is 80 ° or more, and a wide angle with a zoom ratio exceeding 2.5. A zoom lens system can be obtained.

本発明は、広画角でバックフォーカスが長いズームレンズ系として、物体側から順に負正負正のレンズ配置を採用した上で、変倍比（ズーム比）が２．５倍を超える広角ズームレンズ系を得たものである。   The present invention, as a zoom lens system having a wide angle of view and a long back focus, adopts a negative, positive and negative lens arrangement in order from the object side, and a wide-angle zoom lens having a zoom ratio (zoom ratio) exceeding 2.5 times. The system is obtained.

本発明によるズームレンズ系は、図３７の簡易移動図に示すように、物体側から順に、負の第１レンズ群１０、正の第２レンズ群２０、負の第３レンズ群３０、及び正の第４レンズ群４０からなっており、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、第１レンズ群１０と第２レンズ群２０との間隔は減少し、第２レンズ群２０と第３レンズ群３０との間隔は拡大し、第３レンズ群３０と第４レンズ群４０との間隔は減少し、さらに、第２レンズ群２０、第３レンズ群３０及び第４レンズ群４０はそれぞれ物体側に移動する。また、短焦点距離端から長焦点距離端へのズーミングに際し、第１レンズ群１０は、一旦像側に移動し、その後物体側に移動する。そして、短焦点距離端における全長が長焦点距離端における全長より長い。フォーカシングは第１レンズ群１０で行う。第２レンズ群２０と第４レンズ群４０は、一体に移動させることが可能であり、一体に移動させると機械構成が簡単になり、偏心誤差を小さくすることができる。絞りＳは、第２レンズ群２０の前方（物体側）にあって、第２レンズ群２０と一緒に移動する。   The zoom lens system according to the present invention includes a negative first lens group 10, a positive second lens group 20, a negative third lens group 30, and a positive lens sequentially from the object side, as shown in the simplified movement diagram of FIG. In 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, The distance between the second lens group 20 and the third lens group 30 is increased, the distance between the third lens group 30 and the fourth lens group 40 is decreased, and the second lens group 20, the third lens group 30, and the Each of the four lens groups 40 moves to the object side. In zooming from the short focal length end to the long focal length end, the first lens group 10 temporarily moves to the image side and then moves to the object side. The total length at the short focal length end is longer than the total length at the long focal length end. Focusing is performed by the first lens group 10. The second lens group 20 and the fourth lens group 40 can be moved together. When the second lens group 20 and the fourth lens group 40 are moved together, the mechanical configuration is simplified, and the eccentric error can be reduced. The diaphragm S is in front of the second lens group 20 (object side) and moves together with the second lens group 20.

条件式（１）は、第１レンズ群の焦点距離（パワー）を規定している。条件式（１）の下限を超えて第１レンズ群のパワーが強くなると、短焦点距離端での全長を短くすることができるが、コマ収差、歪曲収差が大きくなる。上限を超えて第１レンズ群の屈折力が弱くなると、ズーミング時の移動量が大きくなり、全長の増大を招く。   Conditional expression (1) defines the focal length (power) of the first lens group. When the power of the first lens unit is increased beyond the lower limit of conditional expression (1), the total length at the short focal length end can be shortened, but coma and distortion are increased. If the refractive power of the first lens group becomes weaker beyond the upper limit, the amount of movement during zooming increases, leading to an increase in the overall length.

条件式（２）は、第２レンズ群の焦点距離（パワー）を規定している。条件式（２）の下限を越えて第２レンズ群のパワーが強くなると、ズーミングに伴う各収差の変化量が大きくなってしまう。上限を越えて第２レンズ群のパワーが弱くなると、十分な変倍比を確保することが困難となる。   Conditional expression (2) defines the focal length (power) of the second lens group. If the power of the second lens unit is increased beyond the lower limit of conditional expression (2), the amount of change in each aberration associated with zooming increases. If the power of the second lens group becomes weaker than the upper limit, it becomes difficult to ensure a sufficient zoom ratio.

条件式（３）は、第３レンズ群の焦点距離（パワー）を規定している。条件式（３）の下限を超えて第３レンズ群のパワーが強くなると、球面収差の補正が過剰になるとともに、コマ収差が大きくなる。上限を超えて第３レンズ群の屈折力が弱くなると、ズーミング時の移動量が大きくなり、全長の増大を招く。   Conditional expression (3) defines the focal length (power) of the third lens group. If the power of the third lens unit is increased beyond the lower limit of conditional expression (3), the correction of spherical aberration becomes excessive and the coma aberration increases. If the refractive power of the third lens group becomes weaker beyond the upper limit, the amount of movement during zooming increases, leading to an increase in the overall length.

条件式（４）は、第４レンズ群の焦点距離（パワー）を規定している。条件式（４）の下限を超えて第４レンズ群のパワーが強くなると、コマ収差、非点収差が大きくなり、長いバックフォーカスを得ることが困難になる。上限を超えて第４レンズ群の屈折力が弱くなると、非点収差・歪曲収差の補正が十分でなくなる。   Conditional expression (4) defines the focal length (power) of the fourth lens group. When the power of the fourth lens unit is increased beyond the lower limit of conditional expression (4), coma and astigmatism increase and it is difficult to obtain a long back focus. When the upper limit is exceeded and the refractive power of the fourth lens group becomes weak, correction of astigmatism and distortion is not sufficient.

本発明の広角ズームレンズ系は、より好ましくは、条件式（１）乃至（４）に代えて、次の条件式（１’）乃至（４’）を満足するのがよい。
（１’）１．４＜｜ｆ１／ｆｗ｜＜１．８
（２’）１．７＜ｆ２／ｆｗ＜２．０
（３’）２．７＜｜ｆ３／ｆｗ｜＜３．０
（４’）３．４＜ｆ４／ｆｗ＜４．３ The wide-angle zoom lens system according to the present invention more preferably satisfies the following conditional expressions (1 ′) to (4 ′) instead of the conditional expressions (1) to (4).
(1 ′) 1.4 <| f1 / fw | <1.8
(2 ′) 1.7 <f2 / fw <2.0
(3 ′) 2.7 <| f3 / fw | <3.0
(4 ′) 3.4 <f4 / fw <4.3

条件式（５）は、第１レンズ群の移動量を規定している。条件式（５）の下限を越えると、短焦点距離側における第１レンズ群の繰り出し量（第１レンズ群の最も物体側の面から像面までの長さが最も短くなるズームポジション位置からの第１レンズ群の移動量）が不十分で、バックフォーカスの確保と収差補正が困難となる。上限を越えると、繰り出し量が大きくなりすぎて、画面周辺部の光量を確保するために、レンズ径の増大を招く。   Conditional expression (5) defines the amount of movement of the first lens group. When the lower limit of conditional expression (5) is exceeded, the amount of extension of the first lens unit on the short focal length side (from the zoom position where the length from the surface closest to the object side to the image plane of the first lens unit is the shortest) is reached. The amount of movement of the first lens group is insufficient, and it is difficult to ensure back focus and correct aberrations. If the upper limit is exceeded, the feed amount becomes too large, and the lens diameter increases in order to secure the light quantity at the periphery of the screen.

本発明の広角ズームレンズ系は、第１レンズ群中に、少なくとも１面の非球面を含ませることにより、特に短焦点距離端における非点収差と歪曲収差を良好に補正することができる。非球面レンズは、非球面ガラスモールドレンズ、非球面樹脂モールドレンズ、球面ガラスレンズに樹脂層から成る非球面層を付着させたハイブリッドレンズのいずれから構成してもよい。   The wide-angle zoom lens system of the present invention can satisfactorily correct astigmatism and distortion particularly at the short focal length end by including at least one aspheric surface in the first lens group. The aspheric lens may be composed of any one of an aspheric glass mold lens, an aspheric resin mold lens, and a hybrid lens in which an aspheric layer made of a resin layer is attached to a spherical glass lens.

また、全ズーム域に渡って、球面収差、コマ収差を良好に補正するためには、第２レンズ群以降に非球面を用いるのが効果的であり、かつ、特に画角の広い短焦点距離端における各収差をバランスよく補正するためには、第４レンズ群に非球面を用いるのがより効果的である。また、ズーミング中の色収差の発生を抑えるためには、第４レンズ群が正レンズと負レンズの両方を持つことが必要である。   In order to satisfactorily correct spherical aberration and coma over the entire zoom range, it is effective to use an aspherical surface after the second lens group, and in particular, a short focal length with a wide angle of view. In order to correct each aberration at the end with a good balance, it is more effective to use an aspherical surface for the fourth lens group. In order to suppress the occurrence of chromatic aberration during zooming, the fourth lens group needs to have both a positive lens and a negative lens.

さらに、第４レンズ群は、第２レンズ群とズーミング中一体に移動させた上で、最も物体側の面を非球面とすることが、全ズーム域における収差補正を容易にするために好ましい。一般に非球面レンズは、その形状の複雑さから偏心による影響が球面レンズより大きい。第２、第４レンズ群を一体に移動させる構成においては、この一体群の中心付近に非球面を配置すると、偏心による影響を小さくすることができる。すなわち、第４レンズ群の最も物体側の面を非球面とする。   Further, it is preferable that the fourth lens group is moved integrally with the second lens group during zooming, and the most object side surface is aspherical in order to facilitate aberration correction in the entire zoom range. In general, an aspherical lens is more influenced by eccentricity than a spherical lens due to the complexity of its shape. In the configuration in which the second and fourth lens groups are moved together, if an aspheric surface is disposed near the center of the integral group, the influence of decentering can be reduced. That is, the most object side surface of the fourth lens group is an aspherical surface.

開口絞りは、負正負正のレンズ構成では第２レンズ群と第３レンズ群の間に配置するのが一般的であるが、第２レンズ群の物体側に位置させ、ズーミング時に第２レンズ群と一体に移動させると、像面から射出瞳迄の距離を大きくとることができ、テレセントリック性の向上に有利である。さらに、絞りが第１レンズ群に近づくことにより、広角化に伴う第１レンズ群のレンズ径の増大を抑えることができる。   The aperture stop is generally disposed between the second lens group and the third lens group in a negative positive / negative positive lens configuration, but is positioned on the object side of the second lens group, and the second lens group is used during zooming. The distance from the image plane to the exit pupil can be increased, which is advantageous in improving telecentricity. Furthermore, when the diaphragm approaches the first lens group, it is possible to suppress an increase in the lens diameter of the first lens group due to the wide angle.

また、第４レンズ群の最も像側のレンズを、像側に凸面を向けた正レンズとすることが、テレセントリック性の向上に好ましい。   Further, it is preferable to improve the telecentricity by making the most image side lens of the fourth lens group a positive lens having a convex surface facing the image side.

次に具体的な実施例を示す。諸収差図中、ＳＡは球面収差、ＳＣは正弦条件、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（最も像側のレンズ面から撮像面までの空気換算距離）、ｒは曲率半径、ｄはレンズ厚またはレンズ間隔、Ｎd はｄ線の屈折率、νはアッベ数を示す。
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、ｘは非球面形状、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, SA is spherical aberration, SC is a sine condition, chromatic aberration (axial chromatic aberration) represented by spherical aberration, and d-line, g-line, and C-line in the lateral chromatic aberration diagram are aberrations for each wavelength. , 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 (°), and f B is the back focus (the air equivalent distance from the lens surface closest to the image side to the imaging surface). , R is a radius of curvature, d is a lens thickness or a lens interval, N d is a refractive index of d-line, and ν is an Abbe number.
A rotationally symmetric aspherical surface is defined by
x = cy 2 / [1+ [1- (1 + K) c 2 y 2 ] 1/2 ] + A4y 4 + A6y 6 + A8y 8 + A10y 10 + A12y 12 ...
(Where x is an aspherical shape, c is a curvature (1 / r), y is a height from the optical axis, K is a conical coefficient, A4, A6, A8,. )

図１乃至図４は、本発明の広角ズームレンズ系の実施例１を示している。図１、図３はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図２、図４はそれぞれ、図１、図３のレンズ構成における諸収差を示している。表１はその数値データである。第１レンズ群１０は、物体側から順に、物体側に凸の負のメニスカスレンズ１１と、物体側に凸の負のメニスカスレンズ１２と、物体側に凸のパワーの弱い負メニスカスレンズ１３と、両凸正レンズ１４とからなり、第２レンズ群２０は、物体側から順に、両凸正レンズ２１と、物体側から順に位置する両凸正レンズ２２と負レンズ２３の貼合せレンズとからなり、第３レンズ群３０は、物体側から順に位置する正レンズ３１と負レンズ３２の貼合せレンズからなり、第４レンズ群４０は、両凸正レンズ４１と、物体側から順に位置する負レンズ４２と正レンズ４３の貼合せレンズとからなっている。第４レンズ群４０中、最も物体側の正レンズ４１は、その物体側の凸面に薄い樹脂層を接合した非球面レンズである。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．５０の位置にある。   1 to 4 show Embodiment 1 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 show various aberrations in the lens configurations of FIGS. 1 and 3, respectively. Table 1 shows the numerical data. The first lens group 10 includes, in order from the object side, a negative meniscus lens 11 convex toward the object side, a negative meniscus lens 12 convex toward the object side, and a negative meniscus lens 13 having a low power and convex toward the object side. The second lens group 20 includes, in order from the object side, a biconvex positive lens 21, and a cemented lens of a biconvex positive lens 22 and a negative lens 23 that are sequentially positioned from the object side. The third lens group 30 includes a cemented lens of a positive lens 31 and a negative lens 32 that are sequentially arranged from the object side, and the fourth lens group 40 is a biconvex positive lens 41 and a negative lens that is sequentially arranged from the object side. 42 and a cemented lens of a positive lens 43. In the fourth lens group 40, the most object-side positive lens 41 is an aspheric lens in which a thin resin layer is bonded to the object-side convex surface. The stop S is located at the object side (front of the ninth surface) 1.50 of the second lens group 20.

（表１）
FNo.= 1:4.0-4.3-4.9-5.8
f=16.40-22.60-32.00-43.70
W=42.1-32.5-23.9-17.9
fB=37.34-42.79-50.61-60.76
TLw=150.96
TLt=135.03
面 No. ｒ ｄ Nd ν
1 35.000 1.62 1.77250 49.6
2 16.000 9.96
3 430.160 1.50 1.71300 53.9
4 24.750 2.02
5 32.579 2.20 1.52538 56.3
6* 29.990 4.86
7 90.458 3.00 1.80518 25.4
8 -198.474 44.25-26.33-12.94-4.90
9 50.501 2.72 1.48749 70.2
10 -50.501 1.78
11 39.866 4.43 1.48749 70.2
12 -21.700 1.30 1.64769 33.8
13 -70.280 3.20-6.43-11.29-16.19
14 -54.610 2.35 1.80518 25.4
15 -17.593 1.40 1.76200 40.1
16 110.000 15.40-12.16-7.30-2.40
17* 122.122 0.24 1.52972 42.7
18 133.300 4.56 1.61272 58.7
19 -29.610 0.20
20 -552.040 1.30 1.80610 33.3
21 21.243 5.34 1.48749 70.2
22 -70.280 -
*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
6 -0.10000×10 0.25000×10-4 -0.13100×10-7 -0.11300×10-9
17 -0.10000×10 -0.16200×10-4 (Table 1)
F No. = 1: 4.0-4.3-4.9-5.8
f = 16.40-22.60-32.00-43.70
W = 42.1-32.5-23.9-17.9
f B = 37.34-42.79-50.61-60.76
T Lw = 150.96
T Lt = 135.03
Surface No. r d N d ν
1 35.000 1.62 1.77250 49.6
2 16.000 9.96
3 430.160 1.50 1.71300 53.9
4 24.750 2.02
5 32.579 2.20 1.52538 56.3
6 * 29.990 4.86
7 90.458 3.00 1.80518 25.4
8 -198.474 44.25-26.33-12.94-4.90
9 50.501 2.72 1.48749 70.2
10 -50.501 1.78
11 39.866 4.43 1.48749 70.2
12 -21.700 1.30 1.64769 33.8
13 -70.280 3.20-6.43-11.29-16.19
14 -54.610 2.35 1.80518 25.4
15 -17.593 1.40 1.76200 40.1
16 110.000 15.40-12.16-7.30-2.40
17 * 122.122 0.24 1.52972 42.7
18 133.300 4.56 1.61272 58.7
19 -29.610 0.20
20 -552.040 1.30 1.80610 33.3
21 21.243 5.34 1.48749 70.2
22 -70.280-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 0.25000 × 10 -4 -0.13 100 × 10 -7 -0.11300 × 10 -9
17 -0.10000 × 10 -0.16200 × 10 -4

図５乃至図８は、本発明の広角ズームレンズ系の実施例２を示している。図５、図７はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図６、図８はそれぞれ、図５、図７のレンズ構成における諸収差を示している。表２はその数値データである。基本構成は、実施例１と同様である。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．５０の位置にある。   5 to 8 show a second embodiment of the wide-angle zoom lens system of the present invention. 5 and 7 show the lens configurations at the short focal length end and the long focal length end, respectively, and FIGS. 6 and 8 show various aberrations in the lens configurations of FIGS. 5 and 7, respectively. Table 2 shows the numerical data. The basic configuration is the same as that of the first embodiment. The stop S is located at the object side (front of the ninth surface) 1.50 of the second lens group 20.

（表２）
FNo.= 1: 4.0-4.3-4.9-5.8
f= 16.40-22.61-32.00-43.70
W= 42.1-32.4-23.8-17.9
fB= 37.00-42.36-50.01-60.07
TLw=150.60
TLt=134.80
面 No. ｒ ｄ Nd ν
1 36.318 1.60 1.77250 49.6
2 16.009 9.49
3 385.443 1.50 1.71300 53.9
4 26.268 2.66
5 42.801 2.20 1.52538 56.3
6* 35.253 4.06
7 99.923 3.22 1.80518 25.4
8 -163.364 43.78-25.96-12.76-4.90
9 51.556 2.82 1.48749 70.2
10 -43.211 1.44
11 36.582 4.61 1.48749 70.2
12 23.153 1.30 1.64769 33.8
13 -106.046 3.82-7.10-12.04-16.92
14 -51.251 2.37 1.80518 25.4
15 -16.159 1.40 1.76200 40.1
16 98.084 15.40-12.11-7.18-2.30
17* 116.716 0.24 1.52972 42.7
18 116.716 4.61 1.62041 60.3
19 -30.880 0.10
20 -302.393 1.30 1.80610 33.3
21 22.199 5.69 1.48749 70.2
22 -51.460 -
*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
6 -0.10000×10 -0.24974×10-4 -0.21336×10-8 -0.14338×10-9
17 -0.10000×10 -0.15242×10-4 (Table 2)
F No. = 1: 4.0-4.3-4.9-5.8
f = 16.40-22.61-32.00-43.70
W = 42.1-32.4-23.8-17.9
f B = 37.00-42.36-50.01-60.07
T Lw = 150.60
T Lt = 134.80
Surface No. r d N d ν
1 36.318 1.60 1.77250 49.6
2 16.009 9.49
3 385.443 1.50 1.71300 53.9
4 26.268 2.66
5 42.801 2.20 1.52538 56.3
6 * 35.253 4.06
7 99.923 3.22 1.80518 25.4
8 -163.364 43.78-25.96-12.76-4.90
9 51.556 2.82 1.48749 70.2
10 -43.211 1.44
11 36.582 4.61 1.48749 70.2
12 23.153 1.30 1.64769 33.8
13 -106.046 3.82-7.10-12.04-16.92
14 -51.251 2.37 1.80518 25.4
15 -16.159 1.40 1.76200 40.1
16 98.084 15.40-12.11-7.18-2.30
17 * 116.716 0.24 1.52972 42.7
18 116.716 4.61 1.62041 60.3
19 -30.880 0.10
20 -302.393 1.30 1.80610 33.3
21 22.199 5.69 1.48749 70.2
22 -51.460-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.24974 × 10 -4 -0.21336 × 10 -8 -0.14338 × 10 -9
17 -0.10000 × 10 -0.15242 × 10 -4

図９乃至図１２は、本発明の広角ズームレンズ系の実施例３を示している。図９、図１１はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図１０、図１２はそれぞれ、図９、図１１のレンズ構成における諸収差を示している。表３はその数値データである。基本構成は、実施例１と同様である。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．４０の位置にある。   9 to 12 show Embodiment 3 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, and FIGS. 10 and 12 show various aberrations in the lens configurations of FIGS. 9 and 11, respectively. Table 3 shows the numerical data. The basic configuration is the same as that of the first embodiment. The stop S is located at the object side (front of the ninth surface) 1.40 of the second lens group 20.

（表３）
FNo.= 1:4.0-4.2-4.9-5.6
f=16.40-22.60-32.00-43.70
W=42.1-32.5-23.8-17.9
fB=37.02-42.20-49.59-59.67
TLw=151.05
TLt=135.29
面 No. ｒ ｄ Nd ν
1 35.799 1.66 1.77250 49.6
2 16.076 9.38
3 607.468 1.50 1.72916 54.7
4 26.970 2.64
5 42.654 2.22 1.52538 56.3
6* 34.745 3.84
7 90.420 4.35 1.80518 25.4
8 -192.864 42.81-25.20-12.15-4.40
9 51.831 3.50 1.48749 70.2
10 -43.865 1.86
11 35.592 4.80 1.48749 70.2
12 -23.007 1.30 1.65199 33.6
13 -102.151 3.46-6.88-12.01-16.86
14 -51.739 2.35 1.80518 25.4
15 -16.710 1.20 1.76200 40.4
16 94.531 15.40-11.98-6.85-2.00
17* 108.561 0.10 1.52972 42.7
18 108.561 4.49 1.61800 63.4
19 -30.142 0.23
20 -256.211 1.30 1.80100 35.0
21 21.927 5.62 1.48749 70.2
22 -52.380 -
*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
6 -0.10000×10 -0.23784×10-4 -0.31853×10-8 -0.12123×10-9
17 -0.10000×10 -0.15466×10-4 0.68345×10-11 (Table 3)
F No. = 1: 4.0-4.2-4.9-5.6
f = 16.40-22.60-32.00-43.70
W = 42.1-32.5-23.8-17.9
f B = 37.02-42.20-49.59-59.67
T Lw = 151.05
T Lt = 135.29
Surface No. r d N d ν
1 35.799 1.66 1.77250 49.6
2 16.076 9.38
3 607.468 1.50 1.72916 54.7
4 26.970 2.64
5 42.654 2.22 1.52538 56.3
6 * 34.745 3.84
7 90.420 4.35 1.80518 25.4
8 -192.864 42.81-25.20-12.15-4.40
9 51.831 3.50 1.48749 70.2
10 -43.865 1.86
11 35.592 4.80 1.48749 70.2
12 -23.007 1.30 1.65199 33.6
13 -102.151 3.46-6.88-12.01-16.86
14 -51.739 2.35 1.80518 25.4
15 -16.710 1.20 1.76200 40.4
16 94.531 15.40-11.98-6.85-2.00
17 * 108.561 0.10 1.52972 42.7
18 108.561 4.49 1.61800 63.4
19 -30.142 0.23
20 -256.211 1.30 1.80 100 35.0
21 21.927 5.62 1.48749 70.2
22 -52.380-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.23784 × 10 -4 -0.31853 × 10 -8 -0.12123 × 10 -9
17 -0.10000 × 10 -0.15466 × 10 -4 0.68345 × 10 -11

図１３乃至図１６は、本発明の広角ズームレンズ系の実施例４を示している。図１３、図１５はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図１４、図１６はそれぞれ、図１３、図１５のレンズ構成における諸収差を示している。表４はその数値データである。基本構成は、実施例１と同様である。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．１８の位置にある。   13 to 16 show Embodiment 4 of the wide-angle zoom lens system of the present invention. FIGS. 13 and 15 show the lens configurations at the short focal length end and the long focal length end, respectively, and FIGS. 14 and 16 show various aberrations in the lens configurations of FIGS. 13 and 15, respectively. Table 4 shows the numerical data. The basic configuration is the same as that of the first embodiment. The stop S is located at the object side (front of the ninth surface) 1.18 of the second lens group 20.

（表４）
FNo.= 1:4.0-4.3-4.9-5.7
f=16.40-22.59-32.00-43.70
W=42.1-32.4-23.8-17.8
fB=37.04-42.09-49.50-59.63
TLw=151.00
TLt=134.77
面 No. ｒ ｄ Nd ν
1 35.101 1.50 1.76358 50.3
2 15.950 9.81
3 -1344.617 2.31 1.68759 56.0
4 26.465 2.08
5 38.777 2.25 1.52538 56.3
6* 33.469 3.90
7 90.020 2.73 1.80518 25.4
8 -196.521 43.42-25.68-12.45-4.59
9 53.811 3.73 1.51455 74.2
10 -47.369 4.94
11 33.381 3.18 1.48749 70.2
12 -23.149 1.54 1.65824 33.8
13 -90.200 2.91-6.39-11.50-16.31
14 -46.795 2.25 1.80451 25.5
15 -15.008 1.20 1.75235 38.1
16 103.858 15.40-11.92-6.81-2.00
17* 111.698 0.20 1.52972 42.7
18 111.698 3.98 1.60618 61.6
19 -30.179 0.10
20 -259.734 1.20 1.79791 36.3
21 21.132 5.35 1.48749 70.2
22 -52.280 -
*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
6 -0.10000×10 -0.24900×10-4 -0.19100×10-8 -0.13900×10-9
17 -0.10000×10 -0.15550×10-4 (Table 4)
F No. = 1: 4.0-4.3-4.9-5.7
f = 16.40-22.59-32.00-43.70
W = 42.1-32.4-23.8-17.8
f B = 37.04-42.09-49.50-59.63
T Lw = 151.00
T Lt = 134.77
Surface No. r d N d ν
1 35.101 1.50 1.76358 50.3
2 15.950 9.81
3 -1344.617 2.31 1.68759 56.0
4 26.465 2.08
5 38.777 2.25 1.52538 56.3
6 * 33.469 3.90
7 90.020 2.73 1.80518 25.4
8 -196.521 43.42-25.68-12.45-4.59
9 53.811 3.73 1.51455 74.2
10 -47.369 4.94
11 33.381 3.18 1.48749 70.2
12 -23.149 1.54 1.65824 33.8
13 -90.200 2.91-6.39-11.50-16.31
14 -46.795 2.25 1.80451 25.5
15 -15.008 1.20 1.75235 38.1
16 103.858 15.40-11.92-6.81-2.00
17 * 111.698 0.20 1.52972 42.7
18 111.698 3.98 1.60618 61.6
19 -30.179 0.10
20 -259.734 1.20 1.79791 36.3
21 21.132 5.35 1.48749 70.2
22 -52.280-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.24900 × 10 -4 -0.19 100 × 10 -8 -0.13900 × 10 -9
17 -0.10000 × 10 -0.15550 × 10 -4

図１７乃至図２０は、本発明の広角ズームレンズ系の実施例５を示している。図１７、図１９はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図１８、図２０はそれぞれ、図１７、図１９のレンズ構成における諸収差を示している。表５はその数値データである。基本構成は、実施例１と同様である。第４レンズ群４０中、最も物体側の正レンズ４１は物体側に非球面を持つ非球面ガラスモールドレンズである。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．２７の位置にある。   17 to 20 show Embodiment 5 of the wide-angle zoom lens system of the present invention. FIGS. 17 and 19 show the lens configurations at the short focal length end and the long focal length end, respectively, and FIGS. 18 and 20 show various aberrations in the lens configurations of FIGS. 17 and 19, respectively. Table 5 shows the numerical data. The basic configuration is the same as that of the first embodiment. In the fourth lens group 40, the most object side positive lens 41 is an aspheric glass mold lens having an aspheric surface on the object side. The stop S is located at the object side (front of the ninth surface) 1.27 of the second lens group 20.

（表５）
FNo.= 1:4.1-4.3-4.9-5.8
f=16.40-22.60-32.00-43.70
W=42.1-32.4-23.8-17.9
fB=37.00-42.16-49.68-59.77
TLw=150.94
TLt=134.56
面 No. ｒ ｄ Nd ν
1 35.401 1.65 1.77149 49.8
2 16.024 9.67
3 -758.886 2.20 1.69724 55.5
4 26.392 2.13
5 39.256 2.25 1.52538 56.3
6* 33.421 3.52
7 85.863 2.84 1.80518 25.4
8 -174.429 43.83-25.95-12.61-4.67
9 53.874 3.37 1.50486 80.0
10 -48.009 5.85
11 32.799 3.42 1.48749 70.2
12 -22.375 1.30 1.64498 34.0
13 -87.145 2.53-5.98-11.04-15.93
14 -47.119 2.19 1.80500 34.0
15 -15.637 1.20 1.75001 39.2
16 106.761 15.40-11.96-6.89-2.00
17* 113.933 3.94 1.59759 62.4
18 -28.720 0.10
19 -158.559 1.20 1.78817 37.1
20 21.445 5.35 1.48749 70.2
21 -50.586 -
*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
6 -0.10000×10 -0.24821×10-4 -0.84918×10-9 -0.13260×10-9
17 -0.10000×10 -0.15085×10-4 -0.19983×10-9 (Table 5)
F No. = 1: 4.1-4.3-4.9-5.8
f = 16.40-22.60-32.00-43.70
W = 42.1-32.4-23.8-17.9
f B = 37.00-42.16-49.68-59.77
T Lw = 150.94
T Lt = 134.56
Surface No. r d N d ν
1 35.401 1.65 1.77149 49.8
2 16.024 9.67
3 -758.886 2.20 1.69724 55.5
4 26.392 2.13
5 39.256 2.25 1.52538 56.3
6 * 33.421 3.52
7 85.863 2.84 1.80518 25.4
8 -174.429 43.83-25.95-12.61-4.67
9 53.874 3.37 1.50486 80.0
10 -48.009 5.85
11 32.799 3.42 1.48749 70.2
12 -22.375 1.30 1.64498 34.0
13 -87.145 2.53-5.98-11.04-15.93
14 -47.119 2.19 1.80500 34.0
15 -15.637 1.20 1.75001 39.2
16 106.761 15.40-11.96-6.89-2.00
17 * 113.933 3.94 1.59759 62.4
18 -28.720 0.10
19 -158.559 1.20 1.78817 37.1
20 21.445 5.35 1.48749 70.2
21 -50.586-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.24821 × 10 -4 -0.84918 × 10 -9 -0.13260 × 10 -9
17 -0.10000 × 10 -0.15085 × 10 -4 -0.19983 × 10 -9

図２１乃至図２４は、本発明の広角ズームレンズ系の実施例６を示している。図２１、図２３はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図２２、図２４はそれぞれ、図２１、図２３のレンズ構成における諸収差を示している。表６はその数値データである。基本構成は、実施例５と同様である。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．５３の位置にある。   21 to 24 show a sixth embodiment of the wide-angle zoom lens system according to the present invention. FIGS. 21 and 23 show lens configurations at the short focal length end and long focal length end, respectively. FIGS. 22 and 24 show various aberrations in the lens configurations of FIGS. 21 and 23, respectively. Table 6 shows the numerical data. The basic configuration is the same as that of the fifth embodiment. The stop S is located at the object side (front of the ninth surface) 1.53 of the second lens group 20.

（表６）
FNo.= 1:4.0-4.3-4.9-5.7
f=16.40-22.60-32.00-43.70
W=42.1-32.4-23.8-17.8
fB=37.00-41.90-49.15-58.95
TLw=147.63
TLt=131.39
面 No. ｒ ｄ Nd ν
1 36.221 1.65 1.77000 50.7
2 15.957 9.57
3 -1895.923 2.20 1.65000 58.6
4 26.869 2.15
5 41.167 2.13 1.52538 56.3
6* 33.886 3.47
7 80.110 2.72 1.80518 25.4
8 -270.100 42.71-25.26-12.27-4.53
9 54.935 2.66 1.51244 74.1
10 -47.097 5.04
11 32.917 3.39 1.48749 70.2
12 -22.029 1.30 1.64529 34.0
13 -86.817 2.47-5.94-11.00-15.87
14 -46.169 2.19 1.80500 25.7
15 -15.282 1.20 1.74779 38.7
16 103.319 15.40-11.93-6.87-2.00
17* 113.762 3.78 1.60170 62.2
18 -28.977 0.10
19 -156.840 1.20 1.77924 37.1
20 21.194 5.30 1.48749 70.2
21 -47.996 -
*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
6 -0.10000×10 -0.24170×10-4 -0.39618×10-8 -0.13876×10-9
17 -0.10000×10 -0.14656×10-4 0.10445×10-8 (Table 6)
F No. = 1: 4.0-4.3-4.9-5.7
f = 16.40-22.60-32.00-43.70
W = 42.1-32.4-23.8-17.8
f B = 37.00-41.90-49.15-58.95
T Lw = 147.63
T Lt = 131.39
Surface No. r d N d ν
1 36.221 1.65 1.77000 50.7
2 15.957 9.57
3 -1895.923 2.20 1.65000 58.6
4 26.869 2.15
5 41.167 2.13 1.52538 56.3
6 * 33.886 3.47
7 80.110 2.72 1.80518 25.4
8 -270.100 42.71-25.26-12.27-4.53
9 54.935 2.66 1.51244 74.1
10 -47.097 5.04
11 32.917 3.39 1.48749 70.2
12 -22.029 1.30 1.64529 34.0
13 -86.817 2.47-5.94-11.00-15.87
14 -46.169 2.19 1.80500 25.7
15 -15.282 1.20 1.74779 38.7
16 103.319 15.40-11.93-6.87-2.00
17 * 113.762 3.78 1.60170 62.2
18 -28.977 0.10
19 -156.840 1.20 1.77924 37.1
20 21.194 5.30 1.48749 70.2
21 -47.996-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.24 170 × 10 -4 -0.39618 × 10 -8 -0.13876 × 10 -9
17 -0.10000 × 10 -0.14656 × 10 -4 0.10445 × 10 -8

図２５乃至図２８は、本発明の広角ズームレンズ系の実施例７を示している。図２５、図２７はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図２６、図２８はそれぞれ、図２５、図２７のレンズ構成における諸収差を示している。表７はその数値データである。基本構成は、第２レンズ群２０が物体側から順に両凸正レンズ２１、２２と、物体側から順に位置する両凸正レンズ２３と負レンズ２４の貼合せレンズとからなる点を除き、実施例１と同様である。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．６０の位置にある。   25 to 28 show a seventh embodiment of the wide-angle zoom lens system of the present invention. 25 and 27 show the lens configurations at the short focal length end and the long focal length end, respectively. FIGS. 26 and 28 show various aberrations in the lens configurations of FIGS. 25 and 27, respectively. Table 7 shows the numerical data. The basic configuration is carried out except that the second lens group 20 includes biconvex positive lenses 21 and 22 in order from the object side, and a cemented lens of a biconvex positive lens 23 and a negative lens 24 that are sequentially positioned from the object side. Similar to Example 1. The stop S is located at the object side (front of the ninth surface) 1.60 of the second lens group 20.

（表７）
FNo.= 1:4.1-4.1-4.1-4.1
f=16.30-22.60-31.90-43.70
W=42.2-32.4-23.8-17.8
fB=37.20-41.84-47.79-55.44
TLw=147.63
TLt=131.39
面 No. ｒ ｄ Nd ν
1 61.603 1.60 1.69680 55.5
2 18.301 9.20
3 115.695 1.50 1.71300 53.9
4 31.880 3.86
5 55.465 2.20 1.52538 56.3
6* 43.390 5.56
7 561.840 2.65 1.84666 23.8
8 -118.851 55.54-32.60-15.60-5.00
9 125.769 2.07 1.48749 70.2
10 -335.866 0.20
11 60.094 3.65 1.49700 81.6
12 -60.094 0.40
13 38.011 5.93 1.48749 70.2
14 -29.480 1.30 1.67270 32.1
15 -144.045 2.35-5.33-10.05-15.45
16 -60.055 3.05 1.80518 25.4
17 -16.694 1.20 1.76200 40.1
18 74.773 15.40-12.42-7.69-2.30
19* -1915.812 0.10 1.52972 42.7
20 -1915.812 4.76 1.58913 61.2
21 -31.027 0.10
22 236.582 1.30 1.80610 33.3
23 19.571 5.88 1.48749 70.2
24 -56.464 -
*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
6 -0.10000×10 -0.17340×10-4 -0.27573×10-8 -0.56998×10-10
19 -0.10000×10 -0.10443×10-4 0.16453×10-8 (Table 7)
F No. = 1: 4.1-4.1-4.1-4.1
f = 16.30-22.60-31.90-43.70
W = 42.2-32.4-23.8-17.8
f B = 37.20-41.84-47.79-55.44
T Lw = 147.63
T Lt = 131.39
Surface No. r d N d ν
1 61.603 1.60 1.69680 55.5
2 18.301 9.20
3 115.695 1.50 1.71300 53.9
4 31.880 3.86
5 55.465 2.20 1.52538 56.3
6 * 43.390 5.56
7 561.840 2.65 1.84666 23.8
8 -118.851 55.54-32.60-15.60-5.00
9 125.769 2.07 1.48749 70.2
10 -335.866 0.20
11 60.094 3.65 1.49700 81.6
12 -60.094 0.40
13 38.011 5.93 1.48749 70.2
14 -29.480 1.30 1.67270 32.1
15 -144.045 2.35-5.33-10.05-15.45
16 -60.055 3.05 1.80518 25.4
17 -16.694 1.20 1.76200 40.1
18 74.773 15.40-12.42-7.69-2.30
19 * -1915.812 0.10 1.52972 42.7
20 -1915.812 4.76 1.58913 61.2
21 -31.027 0.10
22 236.582 1.30 1.80610 33.3
23 19.571 5.88 1.48749 70.2
24 -56.464-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.17340 × 10 -4 -0.27573 × 10 -8 -0.56998 × 10 -10
19 -0.10000 × 10 -0.10443 × 10 -4 0.16453 × 10 -8

図２９乃至図３２は、本発明の広角ズームレンズ系の実施例８を示している。図２９、図３１はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図３０、図３２はそれぞれ、図２９、図３１のレンズ構成における諸収差を示している。表８はその数値データである。基本構成は、実施例７と同様である。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．６０の位置にある。   29 to 32 show Example 8 of the wide-angle zoom lens system of the present invention. FIGS. 29 and 31 show the lens configurations at the short focal length end and the long focal length end, respectively, and FIGS. 30 and 32 show various aberrations in the lens configurations of FIGS. 29 and 31, respectively. Table 8 shows the numerical data. The basic configuration is the same as that of the seventh embodiment. The stop S is located at the object side (front of the ninth surface) 1.60 of the second lens group 20.

（表８）
FNo.= 1:4.1-4.1-4.1-4.1
f=16.30-22.59-31.90-43.70
W=42.2-32.5-23.9-17.8
fB=37.22-41.85-47.89-55.90
TLw=147.63
TLt=131.39
面 No. ｒ ｄ Nd ν
1 61.500 1.60 1.69680 55.5
2 18.346 8.79
3 89.373 1.50 1.71300 53.9
4 29.259 4.67
5 58.477 2.20 1.52538 56.3
6* 44.918 4.98
7 1012.500 2.60 1.84666 23.8
8 -108.664 54.81-32.14-15.38-5.01
9 104.800 2.10 1.48749 70.2
10 -508.340 0.20
11 63.950 3.70 1.49700 81.6
12 -63.950 0.52
13 40.113 5.94 1.48749 70.2
14 -28.179 1.30 1.67270 32.1
15 -108.316 2.66-5.71-10.50-15.76
16 -58.917 3.23 1.80518 25.4
17 -16.614 1.20 1.76200 40.1
18 75.438 15.40-12.34-7.55-2.30
19* 278.456 0.10 1.52972 42.7
20 280.000 4.76 1.58913 61.2
21 -30.938 0.10
22 575.504 1.30 1.80610 33.3
23 20.240 5.71 1.48749 70.2
24 -58.125 -
*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
6 -0.10000×10 -0.17710×10-4 -0.45910×10-8 -0.56900×10-10
19 -0.10000×10 -0.11930×10-4 0.29100×10-8 (Table 8)
F No. = 1: 4.1-4.1-4.1-4.1
f = 16.30-22.59-31.90-43.70
W = 42.2-32.5-23.9-17.8
f B = 37.22-41.85-47.89-55.90
T Lw = 147.63
T Lt = 131.39
Surface No. r d N d ν
1 61.500 1.60 1.69680 55.5
2 18.346 8.79
3 89.373 1.50 1.71300 53.9
4 29.259 4.67
5 58.477 2.20 1.52538 56.3
6 * 44.918 4.98
7 1012.500 2.60 1.84666 23.8
8 -108.664 54.81-32.14-15.38-5.01
9 104.800 2.10 1.48749 70.2
10 -508.340 0.20
11 63.950 3.70 1.49700 81.6
12 -63.950 0.52
13 40.113 5.94 1.48749 70.2
14 -28.179 1.30 1.67270 32.1
15 -108.316 2.66-5.71-10.50-15.76
16 -58.917 3.23 1.80518 25.4
17 -16.614 1.20 1.76200 40.1
18 75.438 15.40-12.34-7.55-2.30
19 * 278.456 0.10 1.52972 42.7
20 280.000 4.76 1.58913 61.2
21 -30.938 0.10
22 575.504 1.30 1.80610 33.3
23 20.240 5.71 1.48749 70.2
24 -58.125-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.17710 × 10 -4 -0.45910 × 10 -8 -0.56900 × 10 -10
19 -0.10000 × 10 -0.11930 × 10 -4 0.29 100 × 10 -8

図３３乃至図３６は、本発明の広角ズームレンズ系の実施例８を示している。図３３、図３５はそれぞれ、短焦点距離端、長焦点距離端におけるレンズ構成を示し、図３４、図３６はそれぞれ、図３３、図３５のレンズ構成における諸収差を示している。表９はその数値データである。基本構成は、実施例７と同様である。絞りＳは第２レンズ群２０の物体側（第９面の前方）１．５０の位置にある。   33 to 36 show Embodiment 8 of the wide-angle zoom lens system of the present invention. 33 and 35 show the lens configurations at the short focal length end and the long focal length end, respectively, and FIGS. 34 and 36 show various aberrations in the lens configurations of FIGS. 33 and 35, respectively. Table 9 shows the numerical data. The basic configuration is the same as that of the seventh embodiment. The stop S is located at the object side (front of the ninth surface) 1.50 of the second lens group 20.

（表９）
FNo.= 1:3.2-3.5-4.0-4.6
f=16.30-22.60-31.89-43.70
W=42.2-32.6-24.0-17.9
fB=38.14-43.21-50.06-59.33
TLw=147.63
TLt=131.39
面 No. ｒ ｄ Nd ν
1 35.000 1.60 1.77250 49.6
2 18.043 11.17
3 626.030 1.50 1.71300 53.9
4 27.506 3.93
5 47.906 2.20 1.52538 56.3
6* 37.860 5.69
7 142.427 2.99 1.80518 25.4
8 -164.920 52.33-30.74-14.81-4.90
9 388.486 1.48 1.58913 61.2
10 -328.902 0.20
11 83.050 2.97 1.48749 70.2
12 -57.083 0.50
13 34.155 5.29 1.48749 70.2
14 -28.116 1.30 1.66680 33.0
15 -112.249 2.14-5.31-10.17-15.24
16 -77.431 2.69 1.80518 25.4
17 -20.892 1.20 1.76200 40.1
18 81.895 15.40-12.23-7.37-2.30
19* 313.107 0.10 1.52972 42.7
20 313.107 4.76 1.58913 61.2
21 -31.160 0.10
22 124.786 1.30 1.80610 33.3
23 18.222 5.26 1.48749 70.2
24 -144.055 -
*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
6 -0.10000×10 -0.18163×10-4 -0.13623×10-8 -0.55096×10-10
19 -0.10000×10 -0.10883×10-4 0.29355×10-8 (Table 9)
F No. = 1: 3.2-3.5-4.0-4.6
f = 16.30-22.60-31.89-43.70
W = 42.2-32.6-24.0-17.9
f B = 38.14-43.21-50.06-59.33
T Lw = 147.63
T Lt = 131.39
Surface No. r d N d ν
1 35.000 1.60 1.77250 49.6
2 18.043 11.17
3 626.030 1.50 1.71300 53.9
4 27.506 3.93
5 47.906 2.20 1.52538 56.3
6 * 37.860 5.69
7 142.427 2.99 1.80518 25.4
8 -164.920 52.33-30.74-14.81-4.90
9 388.486 1.48 1.58913 61.2
10 -328.902 0.20
11 83.050 2.97 1.48749 70.2
12 -57.083 0.50
13 34.155 5.29 1.48749 70.2
14 -28.116 1.30 1.66680 33.0
15 -112.249 2.14-5.31-10.17-15.24
16 -77.431 2.69 1.80518 25.4
17 -20.892 1.20 1.76200 40.1
18 81.895 15.40-12.23-7.37-2.30
19 * 313.107 0.10 1.52972 42.7
20 313.107 4.76 1.58913 61.2
21 -31.160 0.10
22 124.786 1.30 1.80610 33.3
23 18.222 5.26 1.48749 70.2
24 -144.055-
* Is a rotationally symmetric aspherical surface.
Aspheric data (Aspheric coefficient not shown is 0.00);
Surface No. K A4 A6 A8
6 -0.10000 × 10 -0.18163 × 10 -4 -0.13623 × 10 -8 -0.55096 × 10 -10
19 -0.10000 × 10 -0.10883 × 10 -4 0.29355 × 10 -8

各実施例の各条件式に対する値を表１０に示す。
（表１０）
実施例１ 実施例２ 実施例３ 実施例４ 実施例５
条件式（1,1'） 1.55 1.54 1.53 1.51 1.52
条件式（2,2'） 1.90 1.88 1.88 1.86 1.87
条件式（3,3'） 3.15 2.91 2.87 2.89 2.94
条件式（4,4'） 3.83 3.50 3.45 3.64 3.72
条件式（５） 1.12 1.12 1.12 1.12 1.12

実施例６ 実施例７ 実施例８ 実施例９
条件式（1,1'） 1.53 1.74 1.73 1.71
条件式（2,2'） 1.84 1.90 1.93 1.99
条件式（3,3'） 2.89 2.89 2.86 3.45
条件式（4,4'） 3.56 4.27 4.08 4.63
条件式（５） 1.12 1.24 1.23 1.19
全ての実施例は、条件式（１）乃至（５）を満足し、かつ諸収差も比較的よく補正されている。さらに、実施例９を除き、条件式（１’）乃至（４’）も満足している。 Table 10 shows values for each conditional expression in each example.
(Table 10)
Example 1 Example 2 Example 3 Example 4 Example 5
Conditional expression (1,1 ') 1.55 1.54 1.53 1.51 1.52
Conditional expression (2,2 ') 1.90 1.88 1.88 1.86 1.87
Conditional expression (3,3 ') 3.15 2.91 2.87 2.89 2.94
Conditional expression (4,4 ') 3.83 3.50 3.45 3.64 3.72
Conditional expression (5) 1.12 1.12 1.12 1.12 1.12

Example 6 Example 7 Example 8 Example 9
Conditional expression (1,1 ') 1.53 1.74 1.73 1.71
Conditional expression (2,2 ') 1.84 1.90 1.93 1.99
Conditional expression (3,3 ') 2.89 2.89 2.86 3.45
Conditional expression (4,4 ') 3.56 4.27 4.08 4.63
Conditional expression (5) 1.12 1.24 1.23 1.19
All the examples satisfy the conditional expressions (1) to (5), and various aberrations are corrected relatively well. Furthermore, except for Example 9, conditional expressions (1 ′) to (4 ′) are also satisfied.

本発明による広角ズームレンズ系の実施例１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 Example 1 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. 図１の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 2 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 1. 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実施例２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 Example 2 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. 図５の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 6 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 5. 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実施例３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 Example 3 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. 図９の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 10 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 9. 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実施例４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 Example 4 of the wide-angle zoom lens system by this invention. 図１３のレンズ構成の諸収差図である。FIG. 14 is a diagram illustrating various aberrations of the lens configuration in FIG. 13. 図１３の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 14 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 13. 図１５のレンズ構成の諸収差図である。FIG. 16 is a diagram illustrating various aberrations of the lens configuration in FIG. 15. 本発明による広角ズームレンズ系の実施例５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 Example 5 of the wide-angle zoom lens system by this invention. 図１７のレンズ構成の諸収差図である。FIG. 18 is a diagram illustrating various aberrations of the lens configuration in FIG. 17. 図１７の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 18 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 17. 図１９のレンズ構成の諸収差図である。FIG. 20 is a diagram illustrating various aberrations of the lens configuration in FIG. 19. 本発明による広角ズームレンズ系の実施例６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 Example 6 of the wide-angle zoom lens system by this invention. 図２１のレンズ構成の諸収差図である。FIG. 22 is a diagram illustrating various aberrations of the lens configuration in FIG. 21. 図２１の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 22 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 21. 図２３のレンズ構成の諸収差図である。FIG. 24 is a diagram illustrating various aberrations of the lens configuration in FIG. 23. 本発明による広角ズームレンズ系の実施例７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 Example 7 of the wide angle zoom lens system by this invention. 図２５のレンズ構成の諸収差図である。FIG. 26 is a diagram illustrating various aberrations of the lens configuration in FIG. 25. 図２５の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 26 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 25. 図２７のレンズ構成の諸収差図である。FIG. 28 is a diagram illustrating various aberrations of the lens configuration in FIG. 27. 本発明による広角ズームレンズ系の実施例８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 Example 8 of the wide-angle zoom lens system by this invention. 図２９のレンズ構成の諸収差図である。FIG. 30 is an aberration diagram of the lens configuration in FIG. 29. 図２９の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 30 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 29. 図３１のレンズ構成の諸収差図である。FIG. 32 is a diagram showing various aberrations of the lens configuration in FIG. 31. 本発明による広角ズームレンズ系の実施例９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 Example 9 of the wide-angle zoom lens system by this invention. 図３３のレンズ構成の諸収差図である。FIG. 34 is a diagram illustrating various aberrations of the lens configuration in FIG. 33. 図３３の広角ズームレンズ系の長焦点距離端におけるレンズ構成図である。FIG. 34 is a lens configuration diagram at a long focal length end of the wide-angle zoom lens system of FIG. 33. 図３５のレンズ構成の諸収差図である。FIG. 36 is a diagram showing various aberrations of the lens configuration in FIG. 35. 本発明による広角ズームレンズ系のズーミング基礎軌跡を示す簡易移動図である。It is a simple movement figure which shows the zooming basic locus of the wide angle zoom lens system by this invention.

Claims (8)

物体側から順に、負の第１レンズ群、正の第２レンズ群、負の第３レンズ群及び正の第４レンズ群からなり、
短焦点距離端から長焦点距離端へのズーミングに際し、第１レンズ群と第２レンズ群との間隔は減少し、第２レンズ群と第３レンズ群との間隔は拡大し、第３レンズ群と第４レンズ群との間隔は減少し、第２、第３、第４レンズ群はそれぞれ物体側に移動し、次の条件式（１）乃至（４）を満足することを特徴とする広角ズームレンズ系。
（１）１．２＜｜ｆ１／ｆｗ｜＜２．０
（２）１．５＜ｆ２／ｆｗ＜２．２
（３）２．５＜｜ｆ３／ｆｗ｜＜３．６
（４）３．２＜ｆ４／ｆｗ＜４．７
但し、
ｆｉ；第ｉレンズ（ｉ＝１〜４）の焦点距離（ｆ１＜０、ｆ３＜０）、
ｆｗ；短焦点距離端における全系の焦点距離。 In order from the object side, a negative first lens group, a positive second lens group, a negative third lens group, and a positive fourth lens group,
During zooming from the short focal length end to the long focal length end, the distance between the first lens group and the second lens group decreases, the distance between the second lens group and the third lens group increases, and the third lens group. The distance between the first lens group and the fourth lens group decreases, the second, third, and fourth lens groups move to the object side, respectively, and satisfy the following conditional expressions (1) to (4): Zoom lens system.
(1) 1.2 <| f1 / fw | <2.0
(2) 1.5 <f2 / fw <2.2
(3) 2.5 <| f3 / fw | <3.6
(4) 3.2 <f4 / fw <4.7
However,
fi: focal length of the i-th lens (i = 1 to 4) (f1 <0, f3 <0),
fw: focal length of the entire system 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（５）を満足する広角ズームレンズ系。
（５） １．０５＜ＴLw／ＴLt＜１．３０
但し、
ＴLw；短焦点距離端における第１レンズ群の物体側の面から像面までの距離、
ＴLt；長焦点距離端における第１レンズ群の物体側の面から像面までの距離。 The wide-angle zoom lens system according to claim 1, wherein the wide-angle zoom lens system satisfies the following conditional expression (5).
(5) 1.05 <T Lw / T Lt <1.30
However,
T Lw ; distance from the object side surface of the first lens group to the image plane at the short focal length end;
T Lt : Distance from the object side surface of the first lens group to the image surface at the long focal length end. 請求項１または２記載の広角ズームレンズ系において、第１レンズ群中に、少なくとも１面の非球面を含む広角ズームレンズ系。 3. The wide-angle zoom lens system according to claim 1, wherein the first lens group includes at least one aspherical surface. 請求項１乃至３のいずれか１項記載の広角ズームレンズ系において、ズーミング中、第２レンズ群と第４レンズ群が一体に移動す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 second lens group and the fourth lens group move together during zooming. 請求項１乃至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４レンズ群は、少なくとも１枚の正レンズと、少なくとも１枚の負レンズを有し、その最も物体側の面が非球面からなる広角ズームレンズ系。 5. The wide-angle zoom lens system according to claim 1, wherein the fourth lens group includes at least one positive lens and at least one negative lens, and the most object-side surface thereof is non-surface. A wide-angle zoom lens system consisting of spherical surfaces. 請求項１乃至５のいずれか１項記載の広角ズームレンズ系において、開口絞りが第２レンズ群の物体側に位置し、ズーミング時に第２レンズ群と一体に移動する広角ズームレンズ系。 6. The wide-angle zoom lens system according to claim 1, wherein the aperture stop is located on the object side of the second lens group and moves together with the second lens group during zooming. 請求項１乃至６のいずれか１項記載の広角ズームレンズ系において、第４レンズ群の最も像側のレンズが、像側に凸面を向けた正レンズ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 6, wherein a lens closest to the image side in the fourth lens group is a positive lens having a convex surface facing the image side. 請求項１乃至７のいずれか１項記載の広角ズームレンズ系において、短焦点距離端から長焦点距離端へのズーミングに際し、第１レンズ群は一旦像側に移動し、その後物体側に移動する広角ズームレンズ系。 The wide-angle zoom lens system according to any one of claims 1 to 7, wherein during the zooming from the short focal length end to the long focal length end, the first lens unit temporarily moves to the image side and then moves to the object side. Wide-angle zoom lens system.
JP2004125834A 2003-05-06 2004-04-21 Wide-angle zoom lens system Expired - Fee Related JP4324508B2 (en)

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