JP2010032701A - Zoom lens, optical device having the same and method for varying magnification - Google Patents
Zoom lens, optical device having the same and method for varying magnification Download PDFInfo
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Abstract
Description
本発明は、ズームレンズ、これを有する光学機器及び変倍方法に関する。 The present invention relates to a zoom lens, an optical apparatus having the same, and a zooming method.
従来、写真用カメラ、電子スチルカメラ、ビデオカメラ等に適した、手ぶれ補正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を参照）。
しかしながら、従来のズームレンズでは、鏡筒内に手ぶれ補正を行う機構を組み込まなければならず、レンズ鏡筒の全長や外径においてコンパクト性が損なわれる傾向にあった。また、手ぶれ補正機能を有するズームレンズでは、高変倍化を図ると光学性能の劣化が著しいという問題があった。 However, in the conventional zoom lens, a mechanism for correcting camera shake must be incorporated in the lens barrel, and the compactness tends to be lost in the overall length and outer diameter of the lens barrel. In addition, a zoom lens having a camera shake correction function has a problem that optical performance is significantly deteriorated when zooming is performed at a high magnification.
本発明は、このような問題に鑑みてなされたものであり、光軸と直交方向の成分を持つように移動可能な光学系により像シフトを行い、手ぶれ補正を可能とし、高変倍化を図りながら性能の劣化が少なくなるよう、適切なレンズ群の屈折力を設定したズームレンズ、これを有する光学機器及び変倍方法を提供することを目的とする。 The present invention has been made in view of such a problem, and performs image shift by an optical system that can move so as to have a component orthogonal to the optical axis, enables camera shake correction, and achieves high zooming. An object of the present invention is to provide a zoom lens in which the refractive power of an appropriate lens group is set so as to reduce the deterioration of performance while aiming, an optical apparatus having the zoom lens, and a zooming method.
このような目的を達成するため、本発明のズームレンズは、物体側から順に並んだ、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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とを有し、前記第４レンズ群の少なくとも一部のレンズ群を光軸と直交方向の成分を持つように移動させ、広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化し、前記第１レンズ群の焦点距離をｆ１とし、前記第４レンズ群の焦点距離をｆ４としたとき、次式３．４５＜ｆ１／（−ｆ４）＜６．００の条件を満足する。 In order to achieve such an object, the zoom lens of the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refraction arranged in order from the object side. A third lens group having power, a fourth lens group having negative refracting power, and a fifth lens group having positive refracting power, and at least a part of the lens group of the fourth lens group is irradiated with light. When the zoom lens is moved so as to have a component orthogonal to the axis, the distance between the lens groups changes upon zooming from the wide-angle end state to the telephoto end state, the focal length of the first lens group is f1, and the fourth lens When the focal length of the group is f4, the following expression 3.45 <f1 / (− f4) <6.00 is satisfied.
なお、前記第４レンズ群の焦点距離をｆ４とし、レンズ全系の望遠端状態における焦点距離ｆｔとしたとき、次式０．０１＜（−ｆ４）／ｆｔ＜０．２０の条件を満足することが好ましい。 When the focal length of the fourth lens group is f4 and the focal length is ft in the telephoto end state of the entire lens system, the following expression 0.01 <(− f4) / ft <0.20 is satisfied. It is preferable.
また、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レンズ群との間隔は増大し、前記第２レンズ群と前記第３レンズ群との間隔は減少し、前記第３レンズ群と前記第４レンズ群との間隔は増大し、前記第４レンズ群と前記第５レンズ群との間隔は減少することが好ましい。 Further, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the third lens group decreases. Preferably, the distance between the third lens group and the fourth lens group is increased, and the distance between the fourth lens group and the fifth lens group is decreased.
また、前記第４レンズ群は、物体側から順に並んだ、負の屈折力を有するレンズ群ＧＡと、前記レンズ群ＧＡの像側に隣接して配置され、負の屈折力を有するレンズ群ＧＢとを有することが好ましい。 The fourth lens group includes a lens group GA having negative refractive power arranged in order from the object side, and a lens group GB having a negative refractive power arranged adjacent to the image side of the lens group GA. It is preferable to have.
また、前記第４レンズ群は、少なくとも１つの非球面を有することが好ましい。 The fourth lens group preferably has at least one aspheric surface.
また、前記第４レンズ群は、接合レンズを有することが好ましい。 The fourth lens group preferably has a cemented lens.
また、前記第２レンズ群の焦点距離をｆ２とし、前記第４レンズ群の焦点距離ｆ４としたとき、次式０．４５＜（−ｆ２）／（−ｆ４）＜１．２５の条件を満足することが好ましい。 Further, when the focal length of the second lens group is f2 and the focal length of the fourth lens group is f4, the following condition 0.45 <(− f2) / (− f4) <1.25 is satisfied. It is preferable to do.
また、望遠端状態におけるバックフォーカスをＢｆｔとし、広角端状態におけるバックフォーカスをＢｆｗとし、レンズ全系の望遠端状態における焦点距離をｆ３としたとき、次式１．３５＜（Ｂｆｔ−Ｂｆｗ）／ｆ３＜１．８０の条件を満足することが好ましい。 Further, when the back focus in the telephoto end state is Bft, the back focus in the wide-angle end state is Bfw, and the focal length in the telephoto end state of the entire lens system is f3, the following expression 1.35 <(Bft−Bfw) / It is preferable to satisfy the condition of f3 <1.80.
また、前記第５レンズ群の焦点距離をｆ５とし、レンズ全系の望遠端状態における焦点距離をｆｔとしたとき、次式０．０５＜ｆ５／ｆｔ＜０．３５の条件を満足することが好ましい。 Further, when the focal length of the fifth lens unit is f5 and the focal length in the telephoto end state of the entire lens system is ft, the following expression 0.05 <f5 / ft <0.35 is satisfied. preferable.
また、前記第１レンズ群の焦点距離をｆ１とし、前記第３レンズ群の焦点距離ｆ３としたとき、次式３．５０＜ｆ１／ｆ３＜４．６０の条件を満足することが好ましい。 Further, when the focal length of the first lens unit is f1 and the focal length of the third lens unit is f3, it is preferable that the following expression 3.50 <f1 / f3 <4.60 is satisfied.
また、広角端状態から望遠端状態への変倍に際し、前記第３レンズ群と前記第５レンズ群とが一体で移動することが好ましい。 Further, it is preferable that the third lens group and the fifth lens group move together when zooming from the wide-angle end state to the telephoto end state.
また、前記第２レンズ群は、少なくとも１つの非球面を有することが好ましい。 The second lens group preferably has at least one aspheric surface.
また、前記第３レンズ群は、少なくとも３枚の正レンズを含むことが好ましい。 The third lens group preferably includes at least three positive lenses.
また、本発明の光学機器は、上記ズームレンズを有する。 An optical apparatus according to the present invention includes the zoom lens.
また、本発明は、物体側から順に並んだ、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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とを有するズームレンズの変倍方法であって、前記第４レンズ群の少なくとも一部のレンズ群を光軸と直交方向の成分を持つように移動させ、広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化し、前記第１レンズ群の焦点距離をｆ１とし、前記第４レンズ群の焦点距離をｆ４としたとき、次式３．４５＜ｆ１／（−ｆ４）＜６．００の条件を満足する。 Further, the present invention provides 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 negative lens arranged in order from the object side. A zoom lens zooming method having a fourth lens group having a refractive power of 5 and a fifth lens group having a positive refractive power, wherein at least a part of the lens group is an optical axis. When the zoom lens is moved so as to have an orthogonal component, the distance between the lens groups changes upon zooming from the wide-angle end state to the telephoto end state, the focal length of the first lens group is f1, and the fourth lens group When the focal length is f4, the following condition 3.45 <f1 / (− f4) <6.00 is satisfied.
本発明によれば、光軸と直交方向の成分を持つように移動可能な光学系により像シフトを行い、手ぶれ補正を可能とし、高変倍化を図りながら性能の劣化が少なくなるよう、適切なレンズ群の屈折力を設定したズームレンズ、これを有する光学機器及び変倍方法を提供することができる。 According to the present invention, image shift is performed by an optical system that can move so as to have a component orthogonal to the optical axis, image stabilization is possible, and it is appropriate to reduce performance deterioration while achieving high zooming. It is possible to provide a zoom lens in which the refractive power of various lens groups is set, an optical apparatus having the same, and a zooming method.
以下、好ましい実施形態について、図面を用いて説明する。図１に示すように、本実施形態におけるズームレンズは、物体側から順に並んだ、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、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５とを有し、第４レンズ群Ｇ４の少なくとも一部のレンズ群を光軸と直交方向の成分を持つように移動させることにより、手ぶれ発生時の像面補正を行う。 Hereinafter, preferred embodiments will be described with reference to the drawings. As shown in FIG. 1, the zoom lens according to the present embodiment includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive lens arranged in order from the object side. A third lens group G3 having a refractive power; a fourth lens group G4 having a negative refractive power; and a fifth lens group G5 having a positive refractive power; and at least a part of the fourth lens group G4. Image plane correction at the time of occurrence of camera shake is performed by moving the lens group so as to have a component orthogonal to the optical axis.
なお、第４レンズ群Ｇ４は、他のレンズ群に比べて構成レンズ枚数が少なく、レンズ径の小型化が可能であるため、手ぶれ補正機構を組み込むことに適している。これにより、レンズ鏡筒の小型化を達成することができるとともに、手ぶれ補正に伴う収差変動を良好に補正することができる。 The fourth lens group G4 is suitable for incorporating a camera shake correction mechanism because the number of constituent lenses is small compared to other lens groups and the lens diameter can be reduced. Accordingly, it is possible to reduce the size of the lens barrel, and it is possible to satisfactorily correct aberration fluctuations accompanying camera shake correction.
そして、上記構成の基で、第１レンズ群Ｇ１の焦点距離をｆ１とし、第４レンズ群Ｇ４の焦点距離をｆ４としたとき、次式（１）の条件を満足することが好ましい。 Based on the above configuration, when the focal length of the first lens group G1 is f1, and the focal length of the fourth lens group G4 is f4, it is preferable that the condition of the following formula (1) is satisfied.
３．４５＜ｆ１／（−ｆ４）＜６．００ …（１） 3.45 <f1 / (− f4) <6.00 (1)
上記条件式（１）は、第１レンズ群Ｇ１の焦点距離ｆ１に対する、第４レンズ群Ｇ４の焦点距離ｆ４を規定するものである。本ズームレンズは、この条件式（１）を満足することで手ぶれ補正時の光学性能の確保しつつ、所定の変倍比を確保することができる。なお、条件式（１）の上限値を上回ると、第４レンズ群Ｇ４の屈折力が強くなり、手振れ補正時の像面湾曲の変動と、偏芯コマ収差の変動とを同時に補正することが困難になる。一方、条件式（１）の下限値を下回ると、第１レンズ群Ｇ１の屈折力が強くなり、望遠端状態における球面収差の補正が困難となる。また、広角端状態における倍率色収差の劣化も顕著となるため好ましくない。 The conditional expression (1) defines the focal length f4 of the fourth lens group G4 with respect to the focal length f1 of the first lens group G1. The zoom lens satisfies the conditional expression (1), so that a predetermined zoom ratio can be ensured while ensuring optical performance during camera shake correction. If the upper limit value of the conditional expression (1) is exceeded, the refractive power of the fourth lens group G4 becomes strong, and it is possible to simultaneously correct the fluctuation of the field curvature and the fluctuation of the eccentric coma at the time of camera shake correction. It becomes difficult. On the other hand, if the lower limit of conditional expression (1) is not reached, the refractive power of the first lens group G1 becomes strong, and it becomes difficult to correct spherical aberration in the telephoto end state. Further, the deterioration of lateral chromatic aberration in the wide-angle end state becomes remarkable, which is not preferable.
なお、本実施形態の効果を確実なものとするために、条件式（１）の下限値を３．５５とすることが好ましい。また、本実施形態の効果を確実なものとするために、条件式（１）の上限値を５．５４とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 3.55. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 5.54.
また、本実施形態において、第４レンズ群Ｇ４の焦点距離をｆ４とし、レンズ全系の望遠端状態における焦点距離ｆｔとしたとき、次式（２）の条件を満足することが好ましい。 In the present embodiment, when the focal length of the fourth lens group G4 is f4 and the focal length is ft in the telephoto end state of the entire lens system, it is preferable that the condition of the following expression (2) is satisfied.
０．０１＜（−ｆ４）／ｆｔ＜０．２０ …（２） 0.01 <(− f4) / ft <0.20 (2)
上記条件式（２）は、望遠端状態の焦点距離ｆｔに対する、第４レンズ群Ｇ４の焦点距離ｆ４を規定するものである。本ズームレンズは、この条件式（２）を満足することで良好な光学性能を実現し、かつ、所定の変倍比を確保することができる。なお、条件式（２）の上限値を上回ると、第４レンズ群Ｇ４の屈折力が弱くなり、第４レンズ群Ｇ４のシフト量が大きくなり、手振れ補正時の非点収差の変動を補正することが困難となる。一方、条件式（２）の下限値を下回ると、第４レンズ群Ｇ４の屈折力が強くなり、望遠端状態における球面収差の補正が困難となる。 Conditional expression (2) defines the focal length f4 of the fourth lens group G4 with respect to the focal length ft in the telephoto end state. The present zoom lens can achieve a good optical performance by satisfying the conditional expression (2), and can secure a predetermined zoom ratio. If the upper limit value of conditional expression (2) is exceeded, the refractive power of the fourth lens group G4 becomes weak, the shift amount of the fourth lens group G4 increases, and the fluctuation of astigmatism during camera shake correction is corrected. It becomes difficult. On the other hand, if the lower limit of conditional expression (2) is not reached, the refractive power of the fourth lens group G4 becomes strong, and it becomes difficult to correct spherical aberration in the telephoto end state.
なお、本実施形態の効果を確実なものとするために、条件式（２）の下限値を０．０５とすることが好ましい。また、本実施形態の効果を確実なものとするために、条件式（２）の上限値を０．１３とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (2) to 0.05. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (2) to 0.13.
また、本実施形態において、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との間隔は増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔は増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔は減少することが好ましい。これにより、球面収差と像面湾曲の変動を効果的に補正しつつ、所定の変倍比を確保することができる。 In the present embodiment, upon zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 increases, and the second lens group G2 and the third lens group G3 Preferably, the distance between the third lens group G3 and the fourth lens group G4 increases, and the distance between the fourth lens group G4 and the fifth lens group G5 decreases. As a result, it is possible to ensure a predetermined zoom ratio while effectively correcting variations in spherical aberration and field curvature.
また、本実施形態において、第４レンズ群Ｇ４は、物体側から順に並んだ、負の屈折力を有する前記レンズ群ＧＡと、負の屈折力を有するレンズ群ＧＢとを有することが好ましい。これにより、望遠端状態における手振れ補正時の像面湾曲の変動と、偏芯コマ収差の変動とを同時に補正することができる。 In the present embodiment, it is preferable that the fourth lens group G4 includes the lens group GA having negative refractive power and the lens group GB having negative refractive power, which are arranged in order from the object side. As a result, it is possible to simultaneously correct the variation in curvature of field at the time of camera shake correction in the telephoto end state and the variation in eccentric coma.
また、本実施形態において、第４レンズ群Ｇ４は、少なくとも１つの非球面を有することが好ましい。これにより、望遠端状態における手振れ補正時の像面湾曲の変動と、偏芯コマ収差の変動とを同時に補正することができる。 In the present embodiment, it is preferable that the fourth lens group G4 has at least one aspheric surface. As a result, it is possible to simultaneously correct the variation in curvature of field at the time of camera shake correction in the telephoto end state and the variation in eccentric coma.
また、本実施形態において、第４レンズ群Ｇ４は、接合レンズを有することが好ましい。この構成により、軸上及び倍率色収差を良好に補正することができる。 In the present embodiment, it is preferable that the fourth lens group G4 includes a cemented lens. With this configuration, axial and lateral chromatic aberration can be corrected well.
また、本実施形態において、第２レンズ群Ｇ２の焦点距離をｆ２とし、第４レンズ群Ｇ４の焦点距離ｆ４としたとき、次式（３）の条件を満足することが好ましい。 In the present embodiment, when the focal length of the second lens group G2 is f2, and the focal length f4 of the fourth lens group G4 is satisfied, it is preferable that the condition of the following expression (3) is satisfied.
０．４５＜（−ｆ２）／（−ｆ４）＜１．２５ …（３） 0.45 <(− f2) / (− f4) <1.25 (3)
上記条件式（３）は、第２レンズ群Ｇ２の焦点距離ｆ２に対する、第４レンズ群Ｇ４の焦点距離ｆ４を規定するものである。本ズームレンズは、この条件式（３）を満足することで良好な光学性能を実現することができる。なお、条件式（３）の上限値を上回ると、第４レンズ群Ｇ４の屈折力が強くなり、手振れ補正時の像面湾曲の変動と、偏芯コマ収差の変動とを同時に補正することが困難になる。一方、条件式（３）の下限値を下回ると、第２レンズ群Ｇ２の屈折力が強くなり、広角端状態における軸外収差、特に像面湾曲と非点収差の補正が困難となる。 Conditional expression (3) defines the focal length f4 of the fourth lens group G4 with respect to the focal length f2 of the second lens group G2. This zoom lens can achieve good optical performance by satisfying conditional expression (3). If the upper limit value of the conditional expression (3) is exceeded, the refractive power of the fourth lens group G4 becomes strong, and it is possible to simultaneously correct the fluctuation of the curvature of field and the fluctuation of the eccentric coma at the time of camera shake correction. It becomes difficult. On the other hand, if the lower limit of conditional expression (3) is not reached, the refractive power of the second lens group G2 becomes strong, and it becomes difficult to correct off-axis aberrations, particularly field curvature and astigmatism in the wide-angle end state.
なお、本実施形態の効果を確実なものとするために、条件式（３）の下限値を０．５３とすることが好ましい。また、本実施形態の効果を確実なものとするために、条件式（３）の上限値を１．００とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (3) to 0.53. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (3) to 1.00.
また、本実施形態において、望遠端状態におけるバックフォーカスをＢｆｔとし、広角端状態におけるバックフォーカスをＢｆｗとし、レンズ全系の望遠端状態における焦点距離をｆ３としたとき、次式（４）の条件を満足することが好ましい。 In this embodiment, when the back focus in the telephoto end state is Bft, the back focus in the wide-angle end state is Bfw, and the focal length in the telephoto end state of the entire lens system is f3, the condition of the following equation (4) Is preferably satisfied.
１．３５＜（Ｂｆｔ−Ｂｆｗ）／ｆ３＜１．８０ …（４） 1.35 <(Bft−Bfw) / f3 <1.80 (4)
上記条件式（４）は、望遠端状態におけるバックフォーカスＢｆｔと広角端状態におけるバックフォーカスＢｆｗとの差分に対する、第３レンズ群Ｇ３の焦点距離ｆ３を規定するものである。本ズームレンズは、この条件式（４）を満足することで良好な光学性能を実現し、かつ、所定の変倍比を確保することができる。なお、条件式（４）の上限値を上回ると、第３レンズ群Ｇ３の屈折力が強くなり、望遠端状態における球面収差の補正が困難になる。一方、条件式（４）の下限値を下回ると、第１レンズ群Ｇ１と第２レンズ群Ｇ２の屈折力が強くなり、広角端状態から望遠端状態において発生する高次のコマ収差変動の補正が困難となる。 Conditional expression (4) defines the focal length f3 of the third lens group G3 with respect to the difference between the back focus Bft in the telephoto end state and the back focus Bfw in the wide angle end state. The zoom lens can satisfy the conditional expression (4) to realize good optical performance and to secure a predetermined zoom ratio. If the upper limit of conditional expression (4) is exceeded, the refractive power of the third lens group G3 becomes strong, and it becomes difficult to correct spherical aberration in the telephoto end state. On the other hand, if the lower limit value of conditional expression (4) is not reached, the refractive powers of the first lens group G1 and the second lens group G2 become stronger, and correction of higher-order coma aberration variation that occurs from the wide-angle end state to the telephoto end state It becomes difficult.
なお、本実施形態の効果を確実なものとするために、条件式（４）の下限値を１．４０とすることが好ましい。また、本実施形態の効果を確実なものとするために、条件式（４）の上限値を１．６５とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (4) to 1.40. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (4) to 1.65.
また、本実施形態においては、第５レンズ群Ｇ５の焦点距離をｆ５とし、レンズ全系の望遠端状態における焦点距離をｆｔとしたとき、次式（５）の条件を満足することが好ましい。 In the present embodiment, it is preferable that the condition of the following expression (5) is satisfied, where f5 is the focal length of the fifth lens group G5 and ft is the focal length in the telephoto end state of the entire lens system.
０．０５＜ｆ５／ｆｔ＜０．３５ …（５） 0.05 <f5 / ft <0.35 (5)
上記条件式（５）は、第５レンズ群Ｇ５の焦点距離ｆ５に対する、望遠端状態における焦点距離ｆｔを規定するものである。本ズームレンズは、この条件式（５）を満足することで良好な光学性能を実現し、かつ、所定の変倍比を確保することができる。なお、条件式（５）の上限値を上回ると、第５レンズ群Ｇ５の屈折力が弱くなり、変倍比を確保するために第３レンズ群Ｇ３の屈折力が強くなり、望遠端状態における球面収差の補正が困難となる。一方、条件式（５）の下限値を下回ると、第５レンズ群Ｇ５の屈折力が強くなり、広角端状態においてコマ収差の補正が困難となる。 Conditional expression (5) defines the focal length ft in the telephoto end state with respect to the focal length f5 of the fifth lens group G5. The present zoom lens can achieve good optical performance by satisfying the conditional expression (5), and can ensure a predetermined zoom ratio. If the upper limit value of the conditional expression (5) is exceeded, the refractive power of the fifth lens group G5 becomes weak, the refractive power of the third lens group G3 becomes strong in order to secure the zoom ratio, and in the telephoto end state. Correction of spherical aberration becomes difficult. On the other hand, if the lower limit of conditional expression (5) is not reached, the refractive power of the fifth lens group G5 becomes strong, and it becomes difficult to correct coma in the wide-angle end state.
なお、本実施形態の効果を確実なものとするために、条件式（５）の下限値を０．１０とすることが好ましい。また、本実施形態の効果を確実なものとするために、条件式（５）の上限値を０．２１とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (5) to 0.10. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (5) to 0.21.
また、本実施形態において、第１レンズ群Ｇ１の焦点距離をｆ１とし、第３レンズ群Ｇ３の焦点距離ｆ３としたとき、次式（６）の条件を満足することが好ましい。 In the present embodiment, when the focal length of the first lens group G1 is f1, and the focal length f3 of the third lens group G3 is satisfied, it is preferable that the condition of the following expression (6) is satisfied.
３．５０＜ｆ１／ｆ３＜４．６０ …（６） 3.50 <f1 / f3 <4.60 (6)
上記条件式（６）は、第１レンズ群Ｇ１の焦点距離ｆ１に対する、第３レンズ群Ｇ３の焦点距離ｆ３を規定するものである。本ズームレンズは、この条件式（６）を満足することで良好な光学性能を実現することができ、さらに効果的に色補正も行うことができる。なお、条件式（６）の上限値を上回ると、第３レンズ群Ｇ３の屈折力が強くなり、広角端状態におけるコマ収差の補正と、望遠端状態における球面収差の補正とが困難となる。また、製造誤差による結像性能の劣化も顕著になってしまう。一方、条件式（６）の下限値を下回ると、第１レンズ群Ｇ１の屈折力が強くなり、倍率色収差の補正が困難となる。 The conditional expression (6) defines the focal length f3 of the third lens group G3 with respect to the focal length f1 of the first lens group G1. The present zoom lens can realize good optical performance by satisfying the conditional expression (6), and can also perform color correction more effectively. If the upper limit value of conditional expression (6) is exceeded, the refractive power of the third lens group G3 becomes strong, and it becomes difficult to correct coma aberration in the wide-angle end state and spherical aberration in the telephoto end state. Further, the deterioration of the imaging performance due to a manufacturing error becomes remarkable. On the other hand, if the lower limit of conditional expression (6) is not reached, the refractive power of the first lens group G1 will become strong, and it will be difficult to correct lateral chromatic aberration.
なお、本実施形態の効果を確実なものとするために、条件式（６）の下限値を４．００とすることが好ましい。また、本実施形態の効果を確実なものとするために、条件式（６）の上限値を４．４０とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (6) to 4.00. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (6) to 4.40.
また、本実施形態において、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と第５レンズ群Ｇ５とが一体で移動することが好ましい。これにより、所定の変倍比を確保しつつ、製造時に第５レンズ群Ｇ５の偏芯による性能の劣化を小さくすることができる。 In the present embodiment, it is preferable that the third lens group G3 and the fifth lens group G5 move together when zooming from the wide-angle end state to the telephoto end state. As a result, it is possible to reduce the deterioration in performance due to the eccentricity of the fifth lens group G5 at the time of manufacture while ensuring a predetermined zoom ratio.
また、本実施形態において、第２レンズ群Ｇ２は、非球面を有することが好ましい。これにより、広角端状態における像面湾曲及び歪曲収差を良好に補正することができる。 In the present embodiment, it is preferable that the second lens group G2 has an aspherical surface. Thereby, it is possible to satisfactorily correct field curvature and distortion in the wide-angle end state.
また、本実施形態において、第３レンズ群Ｇ３は、少なくとも３枚の正レンズを含むことが好ましい。これにより、広角端状態における像面湾曲と、望遠端状態における球面収差を同時に補正することができる。 In the present embodiment, it is preferable that the third lens group G3 includes at least three positive lenses. Thereby, the field curvature in the wide-angle end state and the spherical aberration in the telephoto end state can be corrected simultaneously.
図１３に、上記構成のズームレンズを撮影レンズ１として備えたデジタル一眼レフカメラＣＡＭ（光学機器）の略断面図を示す。図１３に示すデジタル一眼レフカメラＣＡＭにおいて、不図示の物体（被写体）からの光は、撮影レンズ１で集光されて、クイックリターンミラー３を介して焦点板４に結像される。そして、焦点板４に結像された光は、ペンタプリズム５中で複数回反射されて接眼レンズ６へと導かれる。これにより、撮影者は、物体（被写体）像を接眼レンズ６を介して正立像として観察することができる。
FIG. 13 is a schematic cross-sectional view of a digital single-lens reflex camera CAM (optical apparatus) provided with the zoom lens having the above configuration as a photographing
また、撮影者によって不図示のレリーズボタンが押されると、クイックリターンミラー３が光路外へ退避し、撮影レンズ１で集光された不図示の物体（被写体）の光は撮像素子７上に被写体像を形成する。これにより、物体（被写体）からの光は、当該撮像素子７により撮像され、物体（被写体）画像として不図示のメモリに記録される。このようにして、撮影者は本カメラＣＡＭによる物体（被写体）の撮影を行うことができる。なお、図１０に記載のカメラＣＡＭは、撮影レンズ１を着脱可能に保持するものでもよく、撮影レンズ１と一体に成形されるものでもよい。また、カメラＣＡＭは、いわゆる一眼レフカメラでもよく、クイックリターンミラー等を有さないコンパクトカメラでもよい。
Further, when a release button (not shown) is pressed by the photographer, the
以下、本実施形態に係る各実施例について、図面に基づいて説明する。以下に、表１〜表３を示すが、これらは第１〜第３実施例における各諸元の表である。［全体諸元］において、ｆはレンズ全系の焦点距離を、ＦＮＯはＦナンバーを、ωは半画角を、Ｙは像高を、ＴＬはレンズ系全長を、Ｂｆはバックフォーカスを示す。［レンズデータ］においては、面番号は光線の進行する方向に沿った物体側からのレンズ面の順序を、ｒは各レンズ面の曲率半径を、ｄは各光学面から次の光学面（又は像面）までの光軸上の距離である面間隔を、ｎｄはｄ線（波長587.6nm）に対する屈折率を、νｄはｄ線に対するアッベ数を示す。また、レンズ面が非球面である場合には、面番号に＊印を付し、曲率半径ｒの欄には近軸曲率半径を示す。なお、曲率半径の「0.0000」は平面又は開口を示している。［可変間隔データ］において、ｆはレンズ全系の焦点距離を、Ｄｉ（但し、ｉは整数）は第ｉ面の可変の面間隔を示す。［レンズ群データ］において、各群の初面及び焦点距離を示す。［条件式対応値］において、上記の条件式（１）〜（６）に対応する値を示す。 Hereinafter, each example according to the present embodiment will be described with reference to the drawings. Tables 1 to 3 are shown below, but these are tables of specifications in the first to third examples. In [Overall specifications], f is the focal length of the entire lens system, FNO is the F number, ω is the half field angle, Y is the image height, TL is the total length of the lens system, and Bf is the back focus. In [Lens data], the surface number is the order of the lens surfaces from the object side along the direction in which the light beam travels, r is the radius of curvature of each lens surface, and d is the next optical surface from each optical surface (or The distance between the surfaces, which is the distance on the optical axis to the image plane), nd is the refractive index for the d-line (wavelength 587.6 nm), and νd is the Abbe number for the d-line. When the lens surface is aspherical, an asterisk is attached to the surface number, and the paraxial radius of curvature is indicated in the column of the radius of curvature r. The radius of curvature “0.0000” indicates a plane or an opening. In [variable interval data], f indicates the focal length of the entire lens system, and Di (where i is an integer) indicates the variable surface interval of the i-th surface. In [Lens Group Data], the initial surface and focal length of each group are shown. In [Conditional Expression Corresponding Value], values corresponding to the conditional expressions (1) to (6) are shown.
［非球面データ］には、［レンズデータ］に示した非球面について、その形状を次式（ａ）で示す。すなわち、光軸に垂直な方向の高さをｙとし、非球面の頂点における接平面から高さｙにおける非球面上の位置までの光軸に沿った距離（サグ量）をＳ（ｙ）とし、基準球面の曲率半径（近軸曲率半径）をｒとし、円錐係数をＫとし、ｎ次の非球面係数をＡｎとしたとき、以下の式（ａ）で示している。なお、各実施例において、２次の非球面係数Ａ2は０であり、その記載を省略している。また、Ｅnは、×１０nを表す。例えば、1.234E-05＝1.234×10-5である。 In [Aspherical Data], the shape of the aspherical surface shown in [Lens Data] is shown by the following equation (a). That is, y is the height in the direction perpendicular to the optical axis, and S (y) is the distance (sag amount) along the optical axis from the tangent plane at the apex of the aspheric surface to the position on the aspheric surface at height y. When the radius of curvature (paraxial radius of curvature) of the reference spherical surface is r, the conic coefficient is K, and the n-th aspherical coefficient is An, the following equation (a) is given. In each embodiment, the secondary aspheric coefficient A2 is 0, and the description thereof is omitted. Further, En represents × 10 n. For example, 1.234E-05 = 1.234 × 10 −5 .
Ｓ（ｙ）＝（ｙ2／ｒ）／｛１＋（１−Ｋ・y2／ｒ2）1/2｝＋Ａ3×｜ｙ3｜
＋Ａ4×ｙ4＋Ａ6×ｙ6＋Ａ8×ｙ8＋Ａ10×ｙ10＋Ａ12×ｙ12 …（ａ）
S (y) = (y 2 / r) / {1+ (1−K · y 2 / r 2 ) 1/2 } + A 3 × | y 3 |
+ A4 × y 4 + A6 ×
なお、表中において、焦点距離ｆ、曲率半径ｒ、面間隔ｄ、その他の長さの単位は、一般に「ｍｍ」が使われている。但し、光学系は、比例拡大又は比例縮小しても同等の光学性能が得られるので、単位は「ｍｍ」に限定されることなく、他の適当な単位を用いることが可能である。 In the table, “mm” is generally used as the unit of focal length f, radius of curvature r, surface interval d, and other lengths. However, since the optical system can obtain the same optical performance even when proportionally enlarged or proportionally reduced, the unit is not limited to “mm”, and other appropriate units can be used.
以上の表の説明は、他の実施例においても同様とし、その説明を省略する。 The description of the above table is the same in other examples, and the description thereof is omitted.
（第１実施例）
第１実施例について、図１〜図４及び表１を用いて説明する。図１は、第１実施例のレンズ構成図及びズーム軌跡を示したものである。図１に示すように、第１実施例に係るズームレンズは、光軸に沿って物体側から順に並んだ、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、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５と有する。
(First embodiment)
A first embodiment will be described with reference to FIGS. FIG. 1 shows a lens configuration diagram and zoom locus of the first embodiment. As shown in FIG. 1, the zoom lens according to the first example includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power, which are arranged in order from the object side along the optical axis. It has a lens group G2, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
第１レンズ群Ｇ１は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸正レンズ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とを有する。 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. Have.
第２レンズ群Ｇ２は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹負レンズＬ２２と、両凸正レンズＬ２３と、物体側に凹面を向けた負メニスカスレンズＬ２４とを有する。なお、第２レンズ群Ｇ２の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（図１では物体側から数えて６番目の面）に非球面を形成した、非球面レンズである。 The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a negative meniscus having a concave surface facing the object side. And a lens L24. The negative meniscus lens L21 located closest to the object side of the second lens group G2 is an aspheric lens in which an aspheric surface is formed on the glass lens surface on the object side (sixth surface counted from the object side in FIG. 1). It is.
第３レンズ群Ｇ３は、物体側から順に並んだ、両凸正レンズＬ３１と、両凸正レンズＬ３２と両凹負レンズＬ３３との接合レンズと、物体側に凸面を向けた負メニスカスレンズＬ３４と両凸正レンズＬ３５との接合レンズとを有する。 The third lens group G3 includes, in order from the object side, a biconvex positive lens L31, a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33, and a negative meniscus lens L34 having a convex surface facing the object side. It has a cemented lens with a biconvex positive lens L35.
第４レンズ群Ｇ４は、物体側から順に並んだ、両凹負レンズＬ４１と物体側に凸面を向けた正メニスカスレンズＬ４２との接合レンズからなる第４Ａレンズ群ＧＡと、物体側に凹面を向けた負メニスカスレンズＬ４３からなる第４Ｂレンズ群ＧＢとを有する。なお、第４Ｂレンズ群ＧＢの負メニスカスレンズＬ４３は、物体側のガラスレンズ面（図１では物体側から数えて２７番目の面）に非球面を形成した、非球面レンズである。 The fourth lens group G4 is arranged in order from the object side, the fourth A lens group GA composed of a cemented lens of a biconcave negative lens L41 and a positive meniscus lens L42 having a convex surface facing the object side, and a concave surface facing the object side. And a fourth B lens group GB composed of a negative meniscus lens L43. The negative meniscus lens L43 of the fourth B lens group GB is an aspheric lens in which an aspheric surface is formed on the glass lens surface on the object side (the 27th surface counted from the object side in FIG. 1).
第５レンズ群Ｇ５は、物体側から順に並んだ、両凸正レンズＬ５１と、両凸正レンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合レンズと、物体側に凹面を向けた負メニスカスレンズＬ５４とを有する。なお、第５レンズ群Ｇ５の最も像側に位置する負メニスカスレンズＬ５４は、物体側のガラスレンズ面に非球面（図１では物体側から数えて３４番目の面）を形成した、非球面レンズである。 The fifth lens group G5 is composed of a biconvex positive lens L51, a cemented lens composed of a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface facing the object side, and a concave surface facing the object side. Negative meniscus lens L54. The negative meniscus lens L54 located on the most image side of the fifth lens group G5 has an aspherical surface (the 34th surface counted from the object side in FIG. 1) on the object-side glass lens surface. It is.
上記構成である本実施例に係るズームレンズでは、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レンズ群との間隔は増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔は増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔は減少するように、各レンズ群の間隔が変化する。 In the zoom lens according to the present embodiment having the above-described configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group increases, and the second lens group G2 and the second lens group The distance between the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 increases, and the distance between the fourth lens group G4 and the fifth lens group G5 decreases. The distance between the lens groups changes.
絞りＳは、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置され、広角端状態から望遠端状態への変倍に際して第３レンズ群Ｇ３とともに移動する。 The aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 upon zooming from the wide-angle end state to the telephoto end state.
また、本実施例に係るズームレンズでは、遠距離から近距離への合焦は、第２レンズ群Ｇ２を物体方向に繰り出すことによって行う。 In the zoom lens according to the present embodiment, focusing from a long distance to a short distance is performed by extending the second lens group G2 in the object direction.
また、手ぶれ補正（防振）は、第４Ａレンズ群ＧＡを光軸と直交方向の成分を持つように移動させることにより行う。 In addition, camera shake correction (anti-vibration) is performed by moving the 4A lens group GA so as to have a component orthogonal to the optical axis.
なお、第１実施例において、レンズ全系の焦点距離がｆで、ぶれ補正での移動レンズ群の移動量に対する結像面での像移動量の比、すなわち防振係数がＫであるレンズにおいて、角度θの回転ぶれを補正するには、ぶれ補正用の移動レンズ群を（ｆ・tanθ）／Ｋだけ光軸と直交方向の成分を持つように移動させればよい。第１実施例の広角端状態において、防振係数が０．８９であり、焦点距離が２８．８（ｍｍ）であるため、０．５８°の回転ぶれを補正するための第４レンズ群Ｇ４の移動量は０．３３（ｍｍ）となる。また、第１実施例の望遠端状態において、防振係数が１．５０であり、焦点距離が２９２．０（ｍｍ）であるため、０．１８°の回転ぶれを補正するための第４レンズ群Ｇ４の移動量は０．６２（ｍｍ）となる。 In the first embodiment, in a lens in which the focal length of the entire lens system is f, and the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in blur correction, that is, the image stabilization coefficient is K. In order to correct the rotational shake at the angle θ, the moving lens group for shake correction may be moved by (f · tan θ) / K so as to have a component orthogonal to the optical axis. In the first embodiment at the wide-angle end state, the image stabilization coefficient is 0.89 and the focal length is 28.8 (mm). Therefore, the fourth lens group G4 for correcting the rotational blur of 0.58 °. The amount of movement is 0.33 (mm). Further, in the telephoto end state of the first embodiment, since the image stabilization coefficient is 1.50 and the focal length is 292.0 (mm), the fourth lens for correcting the rotation blur of 0.18 °. The movement amount of the group G4 is 0.62 (mm).
以下の表１に第１実施例に係るズームレンズの各諸元の値を掲げる。なお、表１における面番号１〜３５は、図１に示す面１〜３５に対応している。 Table 1 below shows values of various specifications of the zoom lens according to the first example. In addition, the surface numbers 1-35 in Table 1 respond | correspond to the surfaces 1-35 shown in FIG.
（表１）
［全体諸元］
ｆ 28.8 95.2 292.0
Ｆｎｏ 3.6 5.5 6.0
ω 76.6 24.5 8.2
Ｙ 21.6 21.6 21.6
ＴＬ 156.032 198.835 229.227
Ｂｆ 38.462 61.654 76.605
［レンズデータ］
面番号 ｒ ｄ ｎｄ νｄ
1 138.8204 1.000 1.85026 32.35
2 69.6255 9.900 1.49782 82.52
3 -1121.4726 0.100 1.00000
4 66.5234 6.500 1.60300 65.47
5 364.2280 D5 1.00000
＊6 77.5565 0.101 1.55389 38.09
7 69.1985 1.003 1.80400 46.58
8 17.7505 7.303 1.00000
9 -45.2772 1.000 1.81600 46.63
10 64.3914 0.149 1.00000
11 34.6940 4.700 1.84666 23.77
12 -46.1405 1.178 1.00000
13 -27.3129 1.000 1.81600 46.63
14 -2388.7913 D14 1.00000
15 0.0000 0.500 1.00000 （絞りＳ）
16 240.3547 2.700 1.61800 63.38
17 -48.3097 0.100 1.00000
18 32.2344 4.000 1.60300 65.47
19 -65.8684 1.000 1.85026 32.35
20 163.3971 0.300 1.00000
21 28.9156 1.500 1.85026 32.35
22 16.0863 5.700 1.51680 64.12
23 -90.6196 D23 1.00000
24 -353.6058 1.000 1.77250 49.61
25 13.7394 2.967 1.80100 34.96
26 49.7586 5.375 1.00000
＊27 -18.4961 1.000 1.72916 54.66
28 -30.5221 D28 1.00000
29 258.3375 5.299 1.51680 64.12
30 -21.7751 0.100 1.00000
31 71.6589 6.791 1.51823 58.89
32 -19.3953 1.000 1.81600 46.63
33 -37.1560 1.917 1.00000
＊34 -22.1994 1.000 1.79668 45.34
35 -69.8232 Bf 1.00000
［非球面データ］
第６面
κ=4.881,A4=5.5213E-07,A6=-3.4799E-09,A8=-1.0831E-11,
A10=8.3083E-14,A12=0.0000E+00
第２７面
κ=0.6133,A4=3.3743E-06,A6=1.0271E-08,A8=0.0000E+00,
A10=0.0000E+00,A12=0.0000E+00
第３４面
κ=0.8088,A4=-6.7721E-06,A6=1.4720E-08,A8=-2.0115E-11,
A10=0.0000E+00,A12=0.0000E+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
D5 2.025 37.999 65.479
D14 29.610 13.247 1.208
D23 2.683 7.326 8.459
D28 7.070 2.427 1.293
［レンズ群データ］
群番号 群初面 群焦点距離
Ｇ１ １ 112.11
Ｇ２ ６ -17.38
Ｇ３ 16 25.99
Ｇ４ 24 -30.94
Ｇ５ 29 51.56
［条件式対応値］
条件式（１）ｆ１／（−ｆ４）＝3.62
条件式（２）（−ｆ４）／ｆｔ＝0.11
条件式（３）（−ｆ２）／（−ｆ４）＝0.56
条件式（４）（Ｂｆｔ−Ｂｆｗ）／ｆ３＝1.47
条件式（５）ｆ５／ｆｔ＝0.18
条件式（６）ｆ１／ｆ３＝4.31
(Table 1)
[Overall specifications]
f 28.8 95.2 292.0
Fno 3.6 5.5 6.0
ω 76.6 24.5 8.2
Y 21.6 21.6 21.6
TL 156.032 198.835 229.227
Bf 38.462 61.654 76.605
[Lens data]
Surface number r d nd νd
1 138.8204 1.000 1.85026 32.35
2 69.6255 9.900 1.49782 82.52
3 -1121.4726 0.100 1.00000
4 66.5234 6.500 1.60300 65.47
5 364.2280 D5 1.00000
* 6 77.5565 0.101 1.55389 38.09
7 69.1985 1.003 1.80400 46.58
8 17.7505 7.303 1.00000
9 -45.2772 1.000 1.81600 46.63
10 64.3914 0.149 1.00000
11 34.6940 4.700 1.84666 23.77
12 -46.1405 1.178 1.00000
13 -27.3129 1.000 1.81600 46.63
14 -2388.7913 D14 1.00000
15 0.0000 0.500 1.00000 (Aperture S)
16 240.3547 2.700 1.61800 63.38
17 -48.3097 0.100 1.00000
18 32.2344 4.000 1.60300 65.47
19 -65.8684 1.000 1.85026 32.35
20 163.3971 0.300 1.00000
21 28.9156 1.500 1.85026 32.35
22 16.0863 5.700 1.51680 64.12
23 -90.6196 D23 1.00000
24 -353.6058 1.000 1.77250 49.61
25 13.7394 2.967 1.80 100 34.96
26 49.7586 5.375 1.00000
* 27 -18.4961 1.000 1.72916 54.66
28 -30.5221 D28 1.00000
29 258.3375 5.299 1.51680 64.12
30 -21.7751 0.100 1.00000
31 71.6589 6.791 1.51823 58.89
32 -19.3953 1.000 1.81600 46.63
33 -37.1560 1.917 1.00000
* 34 -22.1994 1.000 1.79668 45.34
35 -69.8232 Bf 1.00000
[Aspherical data]
6th surface κ = 4.881, A4 = 5.5213E-07, A6 = -3.4799E-09, A8 = -1.0831E-11,
A10 = 8.3083E-14, A12 = 0.0000E + 00
27th surface κ = 0.6133, A4 = 3.3743E-06, A6 = 1.0271E-08, A8 = 0.0000E + 00,
A10 = 0.0000E + 00, A12 = 0.0000E + 00
34th surface κ = 0.8088, A4 = -6.7721E-06, A6 = 1.4720E-08, A8 = -2.0115E-11,
A10 = 0.0000E + 00, A12 = 0.0000E + 00
[Variable interval data]
Wide-angle end state Intermediate focal length state Telephoto end state
D5 2.025 37.999 65.479
D14 29.610 13.247 1.208
D23 2.683 7.326 8.459
D28 7.070 2.427 1.293
[Lens group data]
Group number Group first surface Group
G2 6 -17.38
G4 24 -30.94
[Conditional expression values]
Conditional expression (1) f1 / (− f4) = 3.62
Conditional expression (2) (-f4) /ft=0.11
Conditional expression (3) (− f2) / (− f4) = 0.56
Conditional expression (4) (Bft−Bfw) /f3=1.47
Conditional expression (5) f5 / ft = 0.18
Conditional expression (6) f1 / f3 = 4.31
表１に示す諸元の表から、第１実施例に係るズームレンズでは、上記条件式（１）〜（６）を全て満たすことが分かる。 From the table of specifications shown in Table 1, it can be seen that the zoom lens according to Example 1 satisfies all the conditional expressions (1) to (6).
図２（ａ），（ｂ）は、それぞれ第１実施例に係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０．５８°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、第１実施例に係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），（ｂ）は、それぞれ第１実施例に係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０．１８°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. 2A and 2B are diagrams illustrating various aberrations at the time of focusing on infinity in the wide-angle end state of the zoom lens according to the first example and blur correction for 0.58 ° rotational blur. It is a meridional transverse aberration diagram at the time. FIG. 3 is a diagram illustrating various aberrations when the zoom lens according to Example 1 is focused at infinity in the intermediate focal length state. FIGS. 4A and 4B are diagrams illustrating various aberrations at the time of focusing on infinity in the telephoto end state of the zoom lens according to the first example and blur correction with respect to a rotational shake of 0.18 °. It is a meridional transverse aberration diagram at the time.
各収差図において、ＦＮＯはＦナンバーを、Ｙは像高（単位：ｍｍ）を示す。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（波長587.6nm）、ｇはｇ線（波長435.8nm）に対する諸収差を、記載のないものはｄ線に対する諸収差をそれぞれ示す。また、非点収差図において、実線はサジタル像面を示し、破線はメリディオナル像面を示す。以上の収差図の説明は、他の実施例においても同様とし、その説明を省略する。 In each aberration diagram, FNO represents an F number, and Y represents an image height (unit: mm). 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. Further, d indicates various aberrations with respect to the d-line (wavelength 587.6 nm), g indicates various aberrations with respect to the g-line (wavelength 435.8 nm), and those not described indicate various aberrations with respect to the d-line. In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. The explanation of the above aberration diagrams is the same in the other examples, and the explanation is omitted.
各収差図から明らかなように、第１実施例では、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が良好に補正され、優れた結像性能を有することが分かる。 As is apparent from the respective aberration diagrams, in the first example, it is understood that various aberrations are well corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent imaging performance is obtained.
（第２実施例）
第２実施例について、図５〜図８及び表２を用いて説明する。図５は、第２実施例のレンズ構成図及びズーム軌跡を示したものである。図５に示すように、第２実施例に係るズームレンズは、光軸に沿って物体側から順に並んだ、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、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５と有する。
(Second embodiment)
A second embodiment will be described with reference to FIGS. FIG. 5 shows a lens configuration diagram and zoom locus of the second embodiment. As shown in FIG. 5, the zoom lens according to the second example includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power, which are arranged in order from the object side along the optical axis. It has a lens group G2, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
第１レンズ群Ｇ１は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸正レンズ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とを有する。 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. Have.
第２レンズ群Ｇ２は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹負レンズＬ２２と、両凸正レンズＬ２３と、物体側に凹面を向けた負メニスカスレンズＬ２４とを有する。第２レンズ群Ｇ２の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（図５では物体側から数えて６番目の面）に非球面を形成した、非球面レンズである。 The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a negative meniscus having a concave surface facing the object side. And a lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspherical lens in which an aspheric surface is formed on the glass lens surface on the object side (sixth surface counted from the object side in FIG. 5). .
第３レンズ群Ｇ３は、物体側から順に並んだ、両凸正レンズＬ３１と、両凸正レンズＬ３２と両凹負レンズＬ３３との接合レンズと、物体側に凸面を向けた負メニスカスレンズＬ３４と両凸正レンズＬ３５との接合レンズとを有する。 The third lens group G3 includes, in order from the object side, a biconvex positive lens L31, a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33, and a negative meniscus lens L34 having a convex surface facing the object side. It has a cemented lens with a biconvex positive lens L35.
第４レンズ群Ｇ４は、物体側から順に並んだ、両凹負レンズＬ４１と物体側に凸面を向けた正メニスカスレンズＬ４２との接合レンズからなる第４Ａレンズ群ＧＡと、物体側に凹面を向けた負メニスカスレンズＬ４３からなる第４Ｂレンズ群ＧＢとを有する。なお、第４Ｂレンズ群ＧＢの負メニスカスレンズＬ４３は、物体側のガラスレンズ面（図５では物体側から数えて２６番目の面）に非球面を形成した、非球面レンズである。 The fourth lens group G4 is arranged in order from the object side, the fourth A lens group GA composed of a cemented lens of a biconcave negative lens L41 and a positive meniscus lens L42 having a convex surface facing the object side, and a concave surface facing the object side. And a fourth B lens group GB composed of a negative meniscus lens L43. The negative meniscus lens L43 of the fourth B lens group GB is an aspheric lens in which an aspheric surface is formed on the glass lens surface on the object side (the 26th surface counted from the object side in FIG. 5).
第５レンズ群Ｇ５は、物体側から順に並んだ、両凸正レンズＬ５１と、両凸正レンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合レンズと、物体側に凹面を向けた負メニスカスレンズＬ５４とを有する。第５レンズ群Ｇ５の最も像側に位置する負メニスカスレンズＬ５４は、物体側のガラスレンズ面（図５では物体側から数えて３３番目の面）に非球面を形成した、非球面レンズである。 The fifth lens group G5 is composed of a biconvex positive lens L51, a cemented lens composed of a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface facing the object side, and a concave surface facing the object side. Negative meniscus lens L54. The negative meniscus lens L54 located closest to the image side of the fifth lens group G5 is an aspherical lens having an aspherical surface formed on the glass lens surface on the object side (the 33rd surface counted from the object side in FIG. 5). .
上記構成である本実施例に係るズームレンズでは、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レンズ群との間隔は増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔は増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔は減少するように、各レンズ群の間隔が変化する。 In the zoom lens according to the present embodiment having the above-described configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group increases, and the second lens group G2 and the second lens group The distance between the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 increases, and the distance between the fourth lens group G4 and the fifth lens group G5 decreases. The distance between the lens groups changes.
絞りＳは、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置され、広角端状態から望遠端状態への変倍に際して第３レンズ群Ｇ３とともに移動する。 The aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 upon zooming from the wide-angle end state to the telephoto end state.
また、本実施例に係るズームレンズでは、遠距離から近距離への合焦は、第２レンズ群Ｇ２を物体方向に繰り出すことによって行う。 In the zoom lens according to the present embodiment, focusing from a long distance to a short distance is performed by extending the second lens group G2 in the object direction.
また、手ぶれ補正（防振）は、第４Ａレンズ群ＧＡを光軸と直交方向の成分を持つように移動させることにより行う。 In addition, camera shake correction (anti-vibration) is performed by moving the 4A lens group GA so as to have a component orthogonal to the optical axis.
なお、第２実施例において、レンズ全系の焦点距離がｆで、ぶれ補正での移動レンズ群の移動量に対する結像面での像移動量の比、すなわち防振係数がＫであるレンズにおいて、角度θの回転ぶれを補正するには、ぶれ補正用の移動レンズ群を（ｆ・tanθ）／Ｋだけ光軸と直交方向の成分を持つように移動させればよい。第２実施例の広角端状態において、防振係数が０．９８であり、焦点距離が２８．８（ｍｍ）であるため、０．５８°の回転ぶれを補正するための第４レンズ群Ｇ４の移動量は０．３０（ｍｍ）となる。また、第２実施例の望遠端状態において、防振係数が１．７０であり、焦点距離が２９２．０（ｍｍ）であるため、０．１８°の回転ぶれを補正するための第４レンズ群Ｇ４の移動量は０．５４（ｍｍ）となる。 In the second embodiment, in the lens in which the focal length of the entire lens system is f, and the ratio of the image movement amount on the imaging surface to the movement amount of the moving lens group in blur correction, that is, the image stabilization coefficient is K. In order to correct the rotational shake at the angle θ, the moving lens group for shake correction may be moved by (f · tan θ) / K so as to have a component orthogonal to the optical axis. In the wide-angle end state of the second embodiment, since the image stabilization coefficient is 0.98 and the focal length is 28.8 (mm), the fourth lens group G4 for correcting the rotational blur of 0.58 °. The amount of movement is 0.30 (mm). Further, in the telephoto end state of the second embodiment, since the image stabilization coefficient is 1.70 and the focal length is 292.0 (mm), the fourth lens for correcting the rotation blur of 0.18 °. The movement amount of the group G4 is 0.54 (mm).
以下の表２に第２実施例に係るズームレンズの各諸元の値を掲げる。なお、表２における面番号１〜３４は、図５に示す面１〜３４に対応している。
Table 2 below shows values of various specifications of the zoom lens according to the second example. The
（表２）
［全体諸元］
ｆ 28.8 100.0 291.9
Ｆｎｏ 3.6 5.4 5.9
ω 76.3 23.4 8.2
Ｙ 21.6 21.6 21.6
ＴＬ 157.869 204.116 230.852
Ｂｆ 38.668 65.898 78.377
［レンズデータ］
面番号 ｒ ｄ ｎｄ νｄ
1 124.2669 1.000 1.85026 32.35
2 65.6300 10.060 1.49782 82.56
3 -11797.766 0.100 1.00000
4 69.1189 6.568 1.59319 67.87
5 585.6642 D5 1.00000
＊6 112.8410 1.000 1.76684 46.82
7 17.9479 7.242 1.00000
8 -46.5542 1.000 1.81600 46.63
9 66.1042 0.100 1.00000
10 34.8030 4.801 1.84666 23.77
11 -39.9905 1.014 1.00000
12 -27.6099 1.000 1.83481 42.72
13 1177.0768 D13 1.00000
14 0.0000 0.500 1.00000 （絞りＳ）
15 45.9090 3.500 1.75500 52.29
16 -58.7912 0.100 1.00000
17 35.0034 4.500 1.49782 82.56
18 -35.3849 1.000 1.79504 28.69
19 65.2580 0.100 1.00000
20 28.8329 1.871 1.81600 46.63
21 15.4357 6.462 1.51742 52.32
22 -87.3182 D22 1.00000
23 -117.6399 1.000 1.77250 49.61
24 16.7518 3.000 1.85026 32.35
25 51.4655 4.628 1.00000
＊26 -24.4461 1.200 1.71300 53.89
27 -58.2076 D27 1.00000
28 73.1770 5.500 1.60311 60.68
29 -24.7896 0.166 1.00000
30 91.8843 6.791 1.51823 58.89
31 -18.6935 1.000 1.81600 46.63
32 -48.9134 1.917 1.00000
＊33 -24.2966 1.000 1.82080 42.71
34 -56.3780 Bf 1.00000
［非球面データ］
第６面
κ=-1.000,A4=1.2946E-06,A6=6.9345E-09,A8=-7.3236E-11,
A10=2.8299E-13,A12=-2.9971E-16
第２６面
κ=0.1763,A4=-1.5504E-06,A6=1.8584E-08,A8=0.0000E+00,
A10=0.0000E+00,A12=0.0000E+00
第３３面
κ=1.000,A4=-4.8013E-06,A6=-2.8757E-09,A8=8.0066E-11,
A10=-2.4817E-13,A12=0.0000E+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
D5 2.226 38.148 64.584
D13 31.000 14.096 1.917
D22 1.523 5.269 6.049
D27 6.332 2.586 1.806
［レンズ群データ］
群番号 群初面 群焦点距離
Ｇ１ １ 110.62
Ｇ２ ６ -17.76
Ｇ３ 15 26.64
Ｇ４ 23 -27.33
Ｇ５ 28 41.87
［条件式対応値］
条件式（１）ｆ１／（−ｆ４）＝4.03
条件式（２）（−ｆ４）／ｆｔ＝0.09
条件式（３）（−ｆ２）／（−ｆ４）＝0.65
条件式（４）（Ｂｆｔ−Ｂｆｗ）／ｆ３＝1.49
条件式（５）ｆ５／ｆｔ＝0.14
条件式（６）ｆ１／ｆ３＝4.14
(Table 2)
[Overall specifications]
f 28.8 100.0 291.9
Fno 3.6 5.4 5.9
ω 76.3 23.4 8.2
Y 21.6 21.6 21.6
TL 157.869 204.116 230.852
Bf 38.668 65.898 78.377
[Lens data]
Surface number r d nd νd
1 124.2669 1.000 1.85026 32.35
2 65.6300 10.060 1.49782 82.56
3 -11797.766 0.100 1.00000
4 69.1189 6.568 1.59319 67.87
5 585.6642 D5 1.00000
* 6 112.8410 1.000 1.76684 46.82
7 17.9479 7.242 1.00000
8 -46.5542 1.000 1.81600 46.63
9 66.1042 0.100 1.00000
10 34.8030 4.801 1.84666 23.77
11 -39.9905 1.014 1.00000
12 -27.6099 1.000 1.83481 42.72
13 1177.0768 D13 1.00000
14 0.0000 0.500 1.00000 (Aperture S)
15 45.9090 3.500 1.75500 52.29
16 -58.7912 0.100 1.00000
17 35.0034 4.500 1.49782 82.56
18 -35.3849 1.000 1.79504 28.69
19 65.2580 0.100 1.00000
20 28.8329 1.871 1.81600 46.63
21 15.4357 6.462 1.51742 52.32
22 -87.3182 D22 1.00000
23 -117.6399 1.000 1.77250 49.61
24 16.7518 3.000 1.85026 32.35
25 51.4655 4.628 1.00000
* 26 -24.4461 1.200 1.71300 53.89
27 -58.2076 D27 1.00000
28 73.1770 5.500 1.60311 60.68
29 -24.7896 0.166 1.00000
30 91.8843 6.791 1.51823 58.89
31 -18.6935 1.000 1.81600 46.63
32 -48.9134 1.917 1.00000
* 33 -24.2966 1.000 1.82080 42.71
34 -56.3780 Bf 1.00000
[Aspherical data]
6th surface κ = -1.000, A4 = 1.2946E-06, A6 = 6.9345E-09, A8 = -7.3236E-11,
A10 = 2.8299E-13, A12 = -2.9971E-16
26th surface κ = 0.1763, A4 = -1.5504E-06, A6 = 1.8584E-08, A8 = 0.0000E + 00,
A10 = 0.0000E + 00, A12 = 0.0000E + 00
33rd surface κ = 1.000, A4 = -4.8013E-06, A6 = -2.8757E-09, A8 = 8.0066E-11,
A10 = -2.4817E-13, A12 = 0.0000E + 00
[Variable interval data]
Wide-angle end state Intermediate focal length state Telephoto end state
D5 2.226 38.148 64.584
D13 31.000 14.096 1.917
D22 1.523 5.269 6.049
D27 6.332 2.586 1.806
[Lens group data]
Group number Group first surface Group
G2 6 -17.76
G4 23 -27.33
[Conditional expression values]
Conditional expression (1) f1 / (− f4) = 4.03
Conditional expression (2) (-f4) /ft=0.09
Conditional expression (3) (− f2) / (− f4) = 0.65
Conditional expression (4) (Bft−Bfw) /f3=1.49
Conditional expression (5) f5 / ft = 0.14
Conditional expression (6) f1 / f3 = 4.14
表２に示す諸元の表から、第２実施例に係るズームレンズでは、上記条件式（１）〜（６）を全て満たすことが分かる。 From the table of specifications shown in Table 2, it can be seen that the zoom lens according to Example 2 satisfies all the conditional expressions (1) to (6).
図６（ａ），（ｂ）は、それぞれ第２実施例に係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０．５８°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、第２実施例に係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），（ｂ）は、それぞれ第２実施例に係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０．１８°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。 6A and 6B are diagrams illustrating various aberrations at the time of focusing on infinity in the wide-angle end state of the zoom lens according to Example 2 and blur correction with respect to a rotational shake of 0.58 °. It is a meridional transverse aberration diagram at the time. FIG. 7 is a diagram illustrating various aberrations when the zoom lens according to Example 2 is focused at infinity in the intermediate focal length state. FIGS. 8A and 8B are diagrams illustrating various aberrations at the time of focusing on infinity in the telephoto end state of the zoom lens according to the second example and blur correction for 0.18 ° rotational shake. It is a meridional transverse aberration diagram at the time.
各収差図から明らかなように、第２実施例では、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が良好に補正され、優れた結像性能を有することが分かる。 As is apparent from the respective aberration diagrams, in the second example, it is understood that various aberrations are favorably corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent imaging performance is obtained.
（第３実施例）
第３実施例について、図９〜図１２及び表３を用いて説明する。図９は、第３実施例のレンズ構成図及びズーム軌跡を示したものである。図９に示すように、第３実施例に係るズームレンズは、光軸に沿って物体側から順に並んだ、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、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５と有する。
(Third embodiment)
A third embodiment will be described with reference to FIGS. 9 to 12 and Table 3. FIG. FIG. 9 shows a lens configuration diagram and zoom locus of the third embodiment. As shown in FIG. 9, the zoom lens according to the third example includes a first lens group G1 having a positive refractive power arranged in order from the object side along the optical axis, and a second lens having a negative refractive power. It has a lens group G2, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
第１レンズ群Ｇ１は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸正レンズ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とを有する。 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. Have.
第２レンズ群Ｇ２は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹負レンズＬ２２と、両凸正レンズＬ２３と、物体側に凹面を向けた負メニスカスレンズＬ２４とを有する。なお、第２レンズ群Ｇ２の最も物体側に位置する負メニスカスレンズＬ２４は、物体側のガラスレンズ面（図９では物体側から数えて６番目の面）に非球面を形成した、非球面レンズである。 The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a negative meniscus having a concave surface facing the object side. And a lens L24. The negative meniscus lens L24 located closest to the object side of the second lens group G2 is an aspheric lens in which an aspherical surface is formed on the glass lens surface on the object side (sixth surface counted from the object side in FIG. 9). It is.
第３レンズ群Ｇ３は、物体側から順に並んだ、両凸正レンズＬ３１と、両凸正レンズＬ３２と、物体側に凸面を向けた負メニスカスレンズＬ３３と物体側に凸面を向けた正メニスカスレンズＬ３４との接合レンズとを有する。 The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, a negative meniscus lens L33 having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side, which are arranged in order from the object side. And a cemented lens with L34.
第４レンズ群Ｇ４は、物体側から順に並んだ、両凹負レンズＬ４１と物体側に凸面を向けた正メニスカスレンズＬ４２との接合レンズからなる第４Ａレンズ群ＧＡと、物体側に凹面を向けた負メニスカスレンズからなる第４Ｂレンズ群ＧＢとを有する。なお、第４Ａレンズ群ＧＡの最も像側に位置する正メニスカスレンズＬ４２は、像側のガラスレンズ面（図９では物体側から数えて２７番目の面）に非球面を形成した、非球面レンズである。 The fourth lens group G4 is arranged in order from the object side, the fourth A lens group GA composed of a cemented lens of a biconcave negative lens L41 and a positive meniscus lens L42 having a convex surface facing the object side, and a concave surface facing the object side. And a fourth B lens group GB made of a negative meniscus lens. The positive meniscus lens L42 located closest to the image side of the 4A lens group GA is an aspherical lens in which an aspherical surface is formed on the image side glass lens surface (27th surface counted from the object side in FIG. 9). It is.
第５レンズ群Ｇ５は、物体側から順に並んだ、両凸正レンズＬ５１と、両凸正レンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合レンズと、物体側に凹面を向けた負メニスカスレンズＬ５４とを有する。第５レンズ群Ｇ５の最も物体側に位置する両凸正レンズＬ５１は、像側のガラスレンズ面（図９では物体側から数えて３４番目の面）に非球面を形成した非球面レンズである。 The fifth lens group G5 is composed of a biconvex positive lens L51, a cemented lens composed of a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface facing the object side, and a concave surface facing the object side. Negative meniscus lens L54. The biconvex positive lens L51 located closest to the object side in the fifth lens group G5 is an aspheric lens in which an aspheric surface is formed on the image side glass lens surface (the 34th surface counted from the object side in FIG. 9). .
上記構成である本実施例に係るズームレンズでは、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レンズ群との間隔は増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間隔は増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との間隔は減少するように、各レンズ群の間隔が変化する。 In the zoom lens according to the present embodiment having the above-described configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group increases, and the second lens group G2 and the second lens group The distance between the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 increases, and the distance between the fourth lens group G4 and the fifth lens group G5 decreases. The distance between the lens groups changes.
絞りＳは、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置され、広角端状態から望遠端状態への変倍に際して第３レンズ群Ｇ３とともに移動する。 The aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 upon zooming from the wide-angle end state to the telephoto end state.
また、本実施例に係るズームレンズでは、遠距離から近距離への合焦は、第２レンズ群Ｇ２を物体方向に繰り出すことによって行う。 In the zoom lens according to the present embodiment, focusing from a long distance to a short distance is performed by extending the second lens group G2 in the object direction.
また、手ぶれ補正（防振）は、第４Ａレンズ群ＧＡを光軸と直交方向の成分を持つように移動させることにより行う。 In addition, camera shake correction (anti-vibration) is performed by moving the 4A lens group GA so as to have a component orthogonal to the optical axis.
なお、第３実施例において、レンズ全系の焦点距離がｆで、ぶれ補正での移動レンズ群の移動量に対する結像面での像移動量の比、すなわち防振係数がＫであるレンズにおいて、角度θの回転ぶれを補正するには、ぶれ補正用の移動レンズ群を（ｆ・tanθ）／Ｋだけ光軸と直交方向の成分を持つように移動させればよい。第３実施例の広角端状態において、防振係数が１．０６であり、焦点距離が２８．８（ｍｍ）であるため、０．５８°の回転ぶれを補正するための第４レンズ群Ｇ４の移動量は０．２７（ｍｍ）となる。また、第３実施例の望遠端状態において、防振係数が１．７０であり、焦点距離が２９１．８（ｍｍ）であるため、０．１８°の回転ぶれを補正するための第４レンズ群Ｇ４の移動量は０．４８（ｍｍ）となる。 In the third embodiment, in a lens in which the focal length of the entire lens system is f, and the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in blur correction, that is, the image stabilization coefficient is K. In order to correct the rotational shake at the angle θ, the moving lens group for shake correction may be moved by (f · tan θ) / K so as to have a component orthogonal to the optical axis. In the third embodiment, in the wide-angle end state, the image stabilization coefficient is 1.06, and the focal length is 28.8 (mm). Therefore, the fourth lens group G4 for correcting the rotation blur of 0.58 °. The amount of movement is 0.27 (mm). Further, in the telephoto end state of the third embodiment, since the image stabilization coefficient is 1.70 and the focal length is 291.8 (mm), the fourth lens for correcting the rotation blur of 0.18 °. The movement amount of the group G4 is 0.48 (mm).
以下の表３に第３実施例に係るズームレンズの各諸元の値を掲げる。なお、表３における面番号１〜３５は、図９に示す面１〜３５に対応している。 Table 3 below shows values of various specifications of the zoom lens according to the third example. In addition, the surface numbers 1-35 in Table 3 respond | correspond to the surfaces 1-35 shown in FIG.
（表３）
［全体諸元］
ｆ 28.8 97.8 291.8
Ｆｎｏ 3.6 5.4 5.9
ω 76.3 24.0 8.2
Ｙ 21.6 21.6 21.6
ＴＬ 155.259 200.892 230.440
Ｂｆ 38.296 61.715 79.010
［レンズデータ］
面番号 ｒ ｄ ｎｄ νｄ
1 131.9600 1.000 1.85026 32.35
2 64.7763 10.026 1.49782 82.52
3 -1939.8917 0.100 1.00000
4 64.6003 6.329 1.61800 63.38
5 410.2657 D5 1.00000
＊6 89.4836 0.100 1.55389 38.09
7 89.4836 1.000 1.81600 46.63
8 17.9244 7.340 1.00000
9 -42.0840 1.000 1.81600 46.63
10 73.2932 0.100 1.00000
11 36.7795 4.691 1.84666 23.78
12 -39.1344 1.214 1.00000
13 -26.1074 1.000 1.81600 46.63
14 -3773.9951 D14 1.00000
15 0.0000 0.500 1.00000 （絞りＳ）
16 224.1127 2.598 1.69680 55.52
17 -66.2510 0.100 1.00000
18 30.7404 3.300 1.49782 82.56
19 -2017.6973 0.100 1.00000
20 27.5622 1.000 1.84666 23.78
21 16.0865 5.531 1.51680 64.12
22 1640.3102 D22 1.00000
23 -254.1339 1.000 1.81600 46.63
24 15.9374 3.355 1.85026 32.35
25 45.3566 5.500 1.00000
26 -20.8777 1.000 1.81600 46.63
＊27 -53.9758 D27 1.00000
28 67.5729 6.000 1.51860 69.89
29 -20.5166 4.000 1.00000
30 47.4864 7.500 1.51742 52.32
31 -20.4408 1.500 1.81600 46.63
32 -56.8501 1.619 1.00000
33 -33.4116 1.000 1.81600 46.63
＊34 -130.4172 Bf 1.00000
［非球面データ］
第６面
κ=8.332,A4=1.1402E-06,A6=5.3964E-10,A8=-2.3261E-11,
A10=1.0349E-13,A12=0.0000E+00
第２７面
κ=-3.0393,A4=4.0455E-06,A6=-5.4765E-09,A8=2.7129E-11,
A10=0.0000E+00,A12=0.0000E+00
第３４面
κ=0.181,A4=-1.3072E-06,A6=5.5840E-09,A8=-8.7610E-11,
A10=2.5603E-13,A12=0.0000E+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
D5 2.325 38.632 62.363
D14 26.770 12.676 1.198
D22 2.836 6.232 7.367
D27 5.530 2.134 1.000
［レンズ群データ］
群番号 群初面 群焦点距離
Ｇ１ １ 107.36
Ｇ２ ６ -16.98
Ｇ３ 16 25.15
Ｇ４ 23 -21.73
Ｇ５ 28 32.44
［条件式対応値］
条件式（１）ｆ１／（−ｆ４）＝4.94
条件式（２）（−ｆ４）／ｆｔ＝0.07
条件式（３）（−ｆ２）／（−ｆ４）＝0.78
条件式（４）（Ｂｆｔ−Ｂｆｗ）／ｆ３＝1.62
条件式（５）ｆ５／ｆｔ＝0.11
条件式（６）ｆ１／ｆ３＝4.27
(Table 3)
[Overall specifications]
f 28.8 97.8 291.8
Fno 3.6 5.4 5.9
ω 76.3 24.0 8.2
Y 21.6 21.6 21.6
TL 155.259 200.892 230.440
Bf 38.296 61.715 79.010
[Lens data]
Surface number r d nd νd
1 131.9600 1.000 1.85026 32.35
2 64.7763 10.026 1.49782 82.52
3 -1939.8917 0.100 1.00000
4 64.6003 6.329 1.61800 63.38
5 410.2657 D5 1.00000
* 6 89.4836 0.100 1.55389 38.09
7 89.4836 1.000 1.81600 46.63
8 17.9244 7.340 1.00000
9 -42.0840 1.000 1.81600 46.63
10 73.2932 0.100 1.00000
11 36.7795 4.691 1.84666 23.78
12 -39.1344 1.214 1.00000
13 -26.1074 1.000 1.81600 46.63
14 -3773.9951 D14 1.00000
15 0.0000 0.500 1.00000 (Aperture S)
16 224.1127 2.598 1.69680 55.52
17 -66.2510 0.100 1.00000
18 30.7404 3.300 1.49782 82.56
19 -2017.6973 0.100 1.00000
20 27.5622 1.000 1.84666 23.78
21 16.0865 5.531 1.51680 64.12
22 1640.3102 D22 1.00000
23 -254.1339 1.000 1.81600 46.63
24 15.9374 3.355 1.85026 32.35
25 45.3566 5.500 1.00000
26 -20.8777 1.000 1.81600 46.63
* 27 -53.9758 D27 1.00000
28 67.5729 6.000 1.51860 69.89
29 -20.5166 4.000 1.00000
30 47.4864 7.500 1.51742 52.32
31 -20.4408 1.500 1.81600 46.63
32 -56.8501 1.619 1.00000
33 -33.4116 1.000 1.81600 46.63
* 34 -130.4172 Bf 1.00000
[Aspherical data]
6th surface κ = 8.332, A4 = 1.1402E-06, A6 = 5.3964E-10, A8 = -2.3261E-11,
A10 = 1.0349E-13, A12 = 0.0000E + 00
27th surface κ = -3.0393, A4 = 4.0455E-06, A6 = -5.4765E-09, A8 = 2.7129E-11,
A10 = 0.0000E + 00, A12 = 0.0000E + 00
34th surface κ = 0.181, A4 = -1.3072E-06, A6 = 5.5840E-09, A8 = -8.7610E-11,
A10 = 2.5603E-13, A12 = 0.0000E + 00
[Variable interval data]
Wide-angle end state Intermediate focal length state Telephoto end state
D5 2.325 38.632 62.363
D14 26.770 12.676 1.198
D22 2.836 6.232 7.367
D27 5.530 2.134 1.000
[Lens group data]
Group number Group first surface Group
G2 6 -16.98
G4 23 -21.73
[Conditional expression values]
Conditional expression (1) f1 / (− f4) = 4.94
Conditional expression (2) (-f4) /ft=0.07
Conditional expression (3) (-f2) / (-f4) = 0.78
Conditional expression (4) (Bft−Bfw) /f3=1.62
Conditional expression (5) f5 / ft = 0.11
Conditional expression (6) f1 / f3 = 4.27
表３に示す諸元の表から、第３実施例に係るズームレンズでは、上記条件式（１）〜（６）を全て満たすことが分かる。 From the table of specifications shown in Table 3, it can be seen that the zoom lens according to Example 3 satisfies all the conditional expressions (1) to (6).
図１０（ａ），（ｂ）は、それぞれ第３実施例に係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０．５８°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、第３実施例に係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），（ｂ）は、それぞれ第３実施例に係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０．１８°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 illustrating various aberrations at the time of focusing on infinity in the wide-angle end state of the zoom lens according to Example 3 and blur correction with respect to a rotational shake of 0.58 °. It is a meridional transverse aberration diagram at the time. FIG. 11 is a diagram illustrating various aberrations when the zoom lens according to Example 3 is focused at infinity in the intermediate focal length state. FIGS. 12A and 12B are graphs showing various aberrations at the time of focusing on infinity in the telephoto end state of the zoom lens according to Example 3 and blur correction for 0.18 ° rotational shake. It is a meridional transverse aberration diagram at the time.
各収差図から明らかなように、第３実施例では、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が良好に補正され、優れた結像性能を有することが分かる。 As is apparent from the respective aberration diagrams, in the third example, it is understood that various aberrations are well corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent imaging performance is obtained.
なお、上述の実施形態において、以下に記載の内容は、光学性能を損なわない範囲で適宜採用可能である。 In the above-described embodiment, the following description can be appropriately adopted as long as the optical performance is not impaired.
上記実施例では、５群構成を示したが、６群、７群等の他の群構成にも適用可能である。また、最も物体側にレンズまたはレンズ群を追加した構成や、最も像側にレンズまたはレンズ群を追加した構成でも構わない。なお、レンズ群とは、変倍時に変化する空気間隔で分離された、少なくとも１枚のレンズを有する部分である。 In the above embodiment, the five-group configuration is shown, but the present invention can also be applied to other group configurations such as the sixth group and the seventh group. Further, a configuration in which a lens or a lens group is added to the most object side, or a configuration in which a lens or a lens group is added to the most image side may be used. The lens group is a portion having at least one lens separated by an air interval that changes during zooming.
また、単独又は複数のレンズ群、又は部分レンズ群を光軸方向に移動させて、無限遠物体から近距離物体への合焦を行う合焦レンズ群としてもよい。前記合焦レンズ群は、オートフォーカスにも適用でき、オートフォーカス用の（超音波モーター等の）モーター駆動にも適している。特に、第２レンズ群Ｇ２の少なくとも一部を合焦レンズ群とするのが好ましい。 In addition, a single lens group, a plurality of lens groups, or a partial lens group may be moved in the optical axis direction to be a focusing lens group that performs focusing from an object at infinity to a near object. The focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (such as an ultrasonic motor). In particular, it is preferable that at least a part of the second lens group G2 is a focusing lens group.
また、レンズ群または部分レンズ群を光軸に垂直な方向の成分を持つように移動させ、または、光軸を含む面内方向に回転移動（揺動）させて、手ブレによって生じる像ブレを補正する防振レンズ群としてもよい。なお、移動としては、光軸上のある点を回転中心とした回転移動（揺動）でもよい。特に、第３レンズ群Ｇ３又は第４レンズ群Ｇ４の少なくとも一部を防振レンズ群とするのが好ましい。 In addition, the lens group or the partial lens group is moved so as to have a component in a direction perpendicular to the optical axis, or is rotated (swayed) in the in-plane direction including the optical axis to reduce image blur caused by camera shake. A vibration-proof lens group to be corrected may be used. The movement may be rotational movement (swing) with a certain point on the optical axis as the rotation center. In particular, it is preferable that at least a part of the third lens group G3 or the fourth lens group G4 is an anti-vibration lens group.
また、レンズ面は、球面または平面で形成されても、非球面で形成されても構わない。レンズ面が球面または平面の場合、レンズ加工及び組立調整が容易になり、加工及び組立調整の誤差による光学性能の劣化を防げるので好ましい。また、像面がずれた場合でも、描写性能の劣化が少ないので好ましい。また、レンズが非球面の場合、非球面は研削加工による非球面、ガラスを型で非球面形状に形成したガラスモールド非球面、ガラスの表面に樹脂を非球面形状に形成した複合型非球面のいずれの非球面でも構わない。また、レンズ面は回折面としてもよく、レンズを屈折率分布型レンズ（ＧＲＩＮレンズ）あるいはプラスチックレンズとしてもよい。 Further, the lens surface may be formed as a spherical surface, a flat surface, or an aspheric surface. When the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and optical performance deterioration due to errors in processing and assembly adjustment can be prevented. In addition, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. If the lens is aspherical, the aspherical surface is an aspherical surface formed by grinding, a glass mold aspherical surface formed of glass with an aspherical shape, or a composite aspherical surface formed of resin on the glass surface with an aspherical shape. Any aspherical surface may be used. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
また、開口絞りＳは、第３レンズ群Ｇ３又は第４レンズ群Ｇ４の近傍に配置されるのが好ましいが、開口絞りとしての部材を設けずに、レンズ枠でその役割を代用してもよい。特に、開口絞りＳは、第３レンズ群Ｇ３の物体側がより好ましい。 The aperture stop S is preferably arranged in the vicinity of the third lens group G3 or the fourth lens group G4. However, the role of the aperture stop may be substituted by a lens frame without providing a member as an aperture stop. . In particular, the aperture stop S is more preferably on the object side of the third lens group G3.
また、各レンズ面に、フレアやゴーストを軽減し、高コントラストの高い光学性能を達成するために、広い波長域で高い透過率を有する反射防止膜を施してもよい。 Each lens surface may be provided with an antireflection film having high transmittance in a wide wavelength region in order to reduce flare and ghost and achieve high optical performance with high contrast.
なお、本実施形態のズームレンズ（変倍光学系）は、変倍比が５〜１８倍であり、より好ましくは８〜１２倍である。 The zoom lens (variable magnification optical system) of the present embodiment has a magnification ratio of 5 to 18 times, more preferably 8 to 12 times.
また、本実施形態のズームレンズ（変倍光学系）は、第１レンズ群Ｇ１が、正のレンズを２つと、負のレンズを１つ有するのが好ましい。第１レンズ群Ｇ１は、物体側から順に、負正正の順番にレンズを配置するのが好ましい。 In the zoom lens (variable magnification optical system) of the present embodiment, it is preferable that the first lens group G1 has two positive lenses and one negative lens. In the first lens group G1, it is preferable to dispose the lenses in order of negative / positive from the object side.
また、本実施形態のズームレンズ（変倍光学系）は、第２レンズ群Ｇ２が、正のレンズを１つと、負のレンズを３つ有するのが好ましい。また、第２レンズ群Ｇ２は、物体側から順に、負負正負の順番にレンズ成分を空気間隔を介在させて配置するのが好ましい。 In the zoom lens (variable magnification optical system) of the present embodiment, it is preferable that the second lens group G2 has one positive lens and three negative lenses. In the second lens group G2, it is preferable that lens components are arranged in order of negative, negative, positive and negative in order from the object side with an air gap interposed therebetween.
また、本実施形態のズームレンズ（変倍光学系）は、第３レンズ群Ｇ３が、正のレンズを３つと、負のレンズを１つ有するのが好ましい。また、第３レンズ群Ｇ３は、物体側から順に、正正正の順番にレンズ成分を空気間隔を介在させて配置するのが好ましい。 In the zoom lens (variable magnification optical system) of the present embodiment, it is preferable that the third lens group G3 has three positive lenses and one negative lens. In the third lens group G3, it is preferable that lens components are arranged in order of positive and positive in order from the object side with an air gap interposed therebetween.
また、本実施形態のズームレンズ（変倍光学系）は、第４レンズ群Ｇ４が、正のレンズを１つと、負のレンズを２つ有するのが好ましい。また、第４レンズ群Ｇ４は、物体側から順に、負負の順番にレンズ成分を空気間隔を介在させて配置するのが好ましい。 In the zoom lens (variable magnification optical system) of the present embodiment, it is preferable that the fourth lens group G4 has one positive lens and two negative lenses. In the fourth lens group G4, it is preferable to dispose lens components in the order of negative and negative in order from the object side with an air gap interposed therebetween.
また、本実施形態のズームレンズ（変倍光学系）は、第５レンズ群Ｇ５が、正のレンズを２つと、負のレンズを１つ有するのが好ましい。また、第５レンズ群Ｇ５は、物体側から順に、正正負の順番にレンズ成分を空気間隔を介在させて配置するのが好ましい。 In the zoom lens (variable magnification optical system) of the present embodiment, it is preferable that the fifth lens group G5 has two positive lenses and one negative lens. In the fifth lens group G5, it is preferable that lens components are arranged in order of positive and negative in order from the object side with an air gap interposed therebetween.
なお、本発明を分かりやすくするために、実施形態の構成要件を付して説明したが、本発明がこれに限定されるものではないことは言うまでもない。 In addition, in order to make this invention intelligible, although demonstrated with the component requirement of embodiment, it cannot be overemphasized that this invention is not limited to this.
Ｇ１ 第１レンズ群
Ｇ２ 第２レンズ群
Ｇ３ 第３レンズ群
Ｇ４ 第４レンズ群
ＧＡ 第４Ａレンズ群
ＧＢ 第４Ｂレンズ群
Ｇ５ 第５レンズ群
Ｓ 開口絞り
Ｉ 像面
ＣＡＭ デジタル一眼レフカメラ
G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group
GA 4A lens group GB 4B lens group G5 5th lens group S Aperture stop I Image surface CAM Digital SLR camera
Claims (15)
前記第４レンズ群の少なくとも一部のレンズ群を光軸と直交方向の成分を持つように移動させ、
広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化し、
前記第１レンズ群の焦点距離をｆ１とし、前記第４レンズ群の焦点距離をｆ４としたとき、次式
３．４５＜ｆ１／（−ｆ４）＜６．００
の条件を満足することを特徴とするズームレンズ。 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 first lens group having a negative refractive power, arranged in order from the object side. 4 lens groups and a fifth lens group having positive refractive power,
Moving at least a part of the fourth lens group so as to have a component orthogonal to the optical axis;
When zooming from the wide-angle end state to the telephoto end state, the distance between the lens groups changes
When the focal length of the first lens group is f1, and the focal length of the fourth lens group is f4, the following expression 3.45 <f1 / (− f4) <6.00
A zoom lens that satisfies the following conditions.
０．０１＜（−ｆ４）／ｆｔ＜０．２０
の条件を満足することを特徴とする請求項１に記載のズームレンズ。 When the focal length of the fourth lens group is f4 and the focal length ft in the telephoto end state of the entire lens system is 0.01 <(− f4) / ft <0.20
The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition.
０．４５＜（−ｆ２）／（−ｆ４）＜１．２５
の条件を満足することを特徴とする請求項１〜６のいずれか一項に記載のズームレンズ。 When the focal length of the second lens group is f2 and the focal length of the fourth lens group is f4, the following expression 0.45 <(− f2) / (− f4) <1.25
The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition.
１．３５＜（Ｂｆｔ−Ｂｆｗ）／ｆ３＜１．８０
の条件を満足することを特徴とする請求項１〜７のいずれか一項に記載のズームレンズ。 When the back focus in the telephoto end state is Bft, the back focus in the wide-angle end state is Bfw, and the focal length in the telephoto end state of the entire lens system is f3, the following expression 1.35 <(Bft−Bfw) / f3 < 1.80
The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition.
０．０５＜ｆ５／ｆｔ＜０．３５
の条件を満足することを特徴とする請求項１〜８のいずれか一項に記載のズームレンズ。 When the focal length of the fifth lens group is f5 and the focal length in the telephoto end state of the entire lens system is ft, the following expression 0.05 <f5 / ft <0.35
The zoom lens according to claim 1, wherein the following condition is satisfied.
３．５０＜ｆ１／ｆ３＜４．６０
の条件を満足することを特徴とする請求項１〜９のいずれか一項に記載のズームレンズ。 When the focal length of the first lens unit is f1 and the focal length of the third lens unit is f3, the following formula 3.50 <f1 / f3 <4.60
The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition.
前記第４レンズ群の少なくとも一部のレンズ群を光軸と直交方向の成分を持つように移動させ、
広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化し、
前記第１レンズ群の焦点距離をｆ１とし、前記第４レンズ群の焦点距離をｆ４としたとき、次式
３．４５＜ｆ１／（−ｆ４）＜６．００
の条件を満足することを特徴とするズームレンズの変倍方法。 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 first lens group having a negative refractive power, arranged in order from the object side. A zoom lens zooming method having four lens groups and a fifth lens group having a positive refractive power,
Moving at least a part of the fourth lens group so as to have a component orthogonal to the optical axis;
When zooming from the wide-angle end state to the telephoto end state, the distance between the lens groups changes
When the focal length of the first lens group is f1, and the focal length of the fourth lens group is f4, the following expression 3.45 <f1 / (− f4) <6.00
A zoom lens zooming method characterized by satisfying the following conditions:
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| CN2009801298852A CN102112905B (en) | 2008-07-28 | 2009-07-27 | Zoom lens, optical device comprising same and method for manufacturing zoom lens |
| US13/056,538 US8736968B2 (en) | 2008-07-28 | 2009-07-27 | Zoom lens, optical apparatus having same, and method of manufacturing zoom lens |
| PCT/JP2009/003521 WO2010013435A1 (en) | 2008-07-28 | 2009-07-27 | Zoom lens, optical device comprising same and method for manufacturing zoom lens |
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