JP5475401B2 - Large-aperture telephoto zoom lens with anti-vibration function - Google Patents

Large-aperture telephoto zoom lens with anti-vibration function Download PDF

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JP5475401B2
JP5475401B2 JP2009253930A JP2009253930A JP5475401B2 JP 5475401 B2 JP5475401 B2 JP 5475401B2 JP 2009253930 A JP2009253930 A JP 2009253930A JP 2009253930 A JP2009253930 A JP 2009253930A JP 5475401 B2 JP5475401 B2 JP 5475401B2
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敦志 山崎
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株式会社シグマ
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本発明は、デジタルスチルカメラ等に用いられるズームレンズに関するもので、特に望遠端の画角が13度以下で、変倍比が3倍弱程度、ズーム全域における開放F値が2.8程度の防振機能を有する大口径望遠ズームレンズに関するものである。 The present invention relates to a zoom lens used in a digital still camera or the like, and particularly has a telephoto end angle of view of 13 degrees or less, a zoom ratio of about 3 times, and an open F value in the entire zoom range of about 2.8. The present invention relates to a large-aperture telephoto zoom lens having an anti-vibration function.
35ミリ判の撮像素子サイズに対応した、望遠側の画角が13度以下で、変倍比が3倍弱程度、ズーム全域における開放F値が2.8程度の防振機能を有する大口径望遠ズームレンズとして特許文献1、2が開示されている。 Large aperture with anti-vibration function corresponding to a 35 mm image sensor size with a telescopic angle of view of 13 degrees or less, a zoom ratio of about 3 times, and an open F value of about 2.8 over the entire zoom range. Patent Documents 1 and 2 are disclosed as telephoto zoom lenses.
35ミリ版の撮像素子サイズに対応した、望遠側の画角が13度以下で、変倍比が3倍弱程度、ズーム全域における開放F値が2.8程度の大口径望遠ズームレンズとして特許文献3、4が開示されている。 Patented as a large-aperture telephoto zoom lens with a telephoto side angle of view of 13 degrees or less, a zoom ratio of about 3 times, and an open F value of about 2.8 over the entire zoom range, corresponding to the 35 mm image sensor size. Documents 3 and 4 are disclosed.
特開2003−090958号公報JP 2003-090958 A
特開2002−162564号公報JP 2002-162564 A
特開平7−140386号公報Japanese Patent Laid-Open No. 7-140386
特開2008−216480号公報JP 2008-216480 A
特許文献1に開示された光学系は、特に望遠端において像高15mm以上でのアンダーな像面湾曲を補正しきれていない。また、周辺光量も十分とは言えず、全長も長いことから周辺光量の改善と全長の縮小が課題となっていた。 The optical system disclosed in Patent Document 1 cannot fully correct the under field curvature at an image height of 15 mm or more particularly at the telephoto end. In addition, the amount of peripheral light is not sufficient, and the total length is long. Therefore, improvement of the peripheral light amount and reduction of the total length have been problems.
特許文献2に開示された光学系は、全長はコンパクトであるが、各群のパワーが強くなることによる球面収差の補正が不十分で、ズーム全域で高い光学性能を有しているとはいえない。 Although the optical system disclosed in Patent Document 2 is compact in overall length, correction of spherical aberration due to strong power of each group is insufficient, and it can be said that it has high optical performance over the entire zoom range. Absent.
特許文献3に開示された光学系は、防振機能を有しておらず、防振機能を搭載することが課題となっていた。 The optical system disclosed in Patent Document 3 has no anti-vibration function, and mounting an anti-vibration function has been a problem.
特許文献4に開示された光学系は、防振機能を有しておらず、防振機能を搭載することが課題となっていた。また、合焦時に移動するレンズ枚数が多く、重量が重いことにより遅くなっている合焦速度の改善が課題となっていた。 The optical system disclosed in Patent Document 4 has no anti-vibration function, and mounting an anti-vibration function has been a problem. In addition, there is a problem of improving the focusing speed, which is slow due to the large number of lenses that move during focusing and the heavy weight.
本発明は、上記課題を解決し、望遠端の画角が13度以下で、変倍比が3倍弱程度であり、ズーム全域における開放F値が2.8程度のコンパクトで光学性能が良好な防振機能を有する大口径望遠ズームレンズを提供することを目的とする。 The present invention solves the above-mentioned problems, has a telephoto end angle of view of 13 degrees or less, a zoom ratio of about 3 times, and a compact, open F-number over the entire zoom range of about 2.8 and good optical performance. An object of the present invention is to provide a large-aperture telephoto zoom lens having a proper anti-vibration function.
上記課題を解決するために、本発明に係る第1の発明は、物体側より順に、正屈折力を有する第1レンズ群G1、負屈折力を有する第2レンズ群G2、正屈折力を有する第3レンズ群G3、正屈折力を有する第4レンズ群G4とで構成され、前記第2レンズ群G2と前記第3レンズ群G3とを光軸に沿って移動させて変倍を行う4群ズームレンズにおいて、前記第4レンズ群G4は、物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏心させて結像位置を変位する構成とし、前記前群G4fは、正屈折力のレンズ2個のみからなり、前記中群G4mは、正屈折力のレンズと負屈折力のレンズとの接合レンズと負屈折力のレンズ1個を含み、前記後群G4rは、正屈折力のレンズ3個と負屈折力のレンズ1個を含み、以下の条件を満足することを特徴とする、防振機能を有する大口径望遠ズームレンズを提供する。
(1)0.80<βG4mr<1.25
(2)−0.28<F4m/Ft<−0.18
F4m:前記中群G4mの焦点距離
Ft:望遠端におけるレンズ全系の焦点距離
βG4mr:すべてのズームポジションにおける前記中群G4mおよび後群G4rの合成倍率
In order to solve the above-mentioned problem, the first invention according to the present invention has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive refractive power. The fourth lens group G3 includes a third lens group G3 and a fourth lens group G4 having positive refractive power, and performs zooming by moving the second lens group G2 and the third lens group G3 along the optical axis. In the zoom lens, the fourth lens group G4 includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power. The image forming position is displaced by decentering G4m in a direction substantially perpendicular to the optical axis. The front group G4f includes only two lenses having positive refractive power, and the middle group G4m includes lenses having positive refractive power. A cemented lens with a negative refractive power lens and one negative refractive power lens In addition, the rear group G4r provides a large-aperture telephoto zoom lens having an anti-vibration function, including three lenses having positive refractive power and one lens having negative refractive power, and satisfying the following conditions: To do.
(1) 0.80 <βG4mr <1.25
(2) -0.28 <F4m / Ft <-0.18
F4m: focal length of the middle group G4m Ft: focal length of the entire lens system at the telephoto end βG4mr: combined magnification of the middle group G4m and the rear group G4r at all zoom positions
また、本発明に係る第2の発明は、以下の条件を満足することを特徴とする、第1の発明の防振機能を有する大口径望遠ズームレンズを提供する。
(3)0.10<D4f/F4f<0.16
F4f:前記前群G4fの焦点距離
D4f:前記前群G4fの最も物体側の面と最も像側の面との光軸に沿った距離
A second invention according to the present invention provides a large-aperture telephoto zoom lens having the image stabilization function according to the first invention, characterized by satisfying the following conditions.
(3) 0.10 <D4f / F4f <0.16
F4f: focal length of the front group G4f D4f: distance along the optical axis between the most object side surface and the most image side surface of the front group G4f
また、本発明に係る第3の発明は、以下の条件を満足することを特徴とする、第1の発明の防振機能を有する大口径望遠ズームレンズを提供する。
(4)1<(0.8−0.0043×ν4mn)/(N4mn−1)
N4mn:前記中群G4m中、接合レンズを構成する負屈折力レンズの屈折率
ν4mn:前記中群G4m中、接合レンズを構成する負屈折力レンズのアッベ数
According to a third aspect of the present invention, there is provided a large-aperture telephoto zoom lens having the image stabilization function according to the first aspect of the invention, which satisfies the following conditions.
(4) 1 <(0.8−0.0043 × ν4mn) / (N4mn−1)
N4mn: Refractive index of the negative refractive power lens constituting the cemented lens in the middle group G4m ν4mn: Abbe number of the negative refractive power lens constituting the cemented lens in the middle group G4m
また、本発明に係る第4の発明は、前記第1レンズ群G1は、物体面側から順に合焦時に移動しない固定されたG1aレンズ群と、光軸上を移動させて焦点合わせを行うG1bレンズ群とで構成され、前記G1aレンズ群は、1個の負屈折力レンズと1個の正屈折力レンズを含み、前記G1bレンズ群は、2個の正屈折力レンズのみから構成されることを特徴とする、第1の発明または第2の発明の防振機能を有する大口径望遠ズームレンズを提供する。 According to a fourth aspect of the present invention, the first lens group G1 includes a fixed G1a lens group that does not move during focusing from the object surface side in order, and moves on the optical axis to perform focusing. The G1a lens group includes one negative refractive power lens and one positive refractive power lens, and the G1b lens group includes only two positive refractive power lenses. A large-aperture telephoto zoom lens having the image stabilization function of the first or second invention is provided.
また、本発明に係る第5の発明は、以下の条件を満足することを特徴とする、第1の発明乃至第3の発明の防振機能を有する大口径望遠ズームレンズを提供する。
(5)0.80<L23w/Fw<0.93
L23w:広角端における前記第2レンズ群G2の先頭面から前記第3レンズ群G3の最終面の距離
Fw:広角端におけるレンズ全系の焦点距離
According to a fifth aspect of the present invention, there is provided a large-aperture telephoto zoom lens having the image stabilization function according to the first to third aspects, wherein the following conditions are satisfied.
(5) 0.80 <L23w / Fw <0.93
L23w: Distance from the front surface of the second lens group G2 to the final surface of the third lens group G3 at the wide angle end Fw: Focal length of the entire lens system at the wide angle end
本発明によれば、デジタルスチルカメラ等に用いられるズームレンズに関するもので、特に望遠端の画角が13度以下で、変倍比が3倍弱程度であり、ズーム全域における開放F値が2.8程度の防振機能を有する大口径望遠ズームレンズを提供することができる。 The present invention relates to a zoom lens used in a digital still camera or the like. In particular, the angle of view at the telephoto end is 13 degrees or less, the zoom ratio is about 3 times, and the open F-number over the entire zoom range is 2. A large-aperture telephoto zoom lens having an anti-vibration function of about .8 can be provided.
実施例1のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Example 1 at infinity at the wide-angle end 実施例1のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 1 at infinity at the wide-angle end 実施例1のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 1 at infinity at the telephoto end 実施例1のズームレンズの広角端の無限遠における標準状態での横収差図Lateral aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens of Example 1 実施例1のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 1 実施例1のズームレンズの広角端の無限遠における防振時の横収差図Transverse aberration diagram during vibration isolation at infinity at the wide-angle end of the zoom lens of Example 1 実施例1のズームレンズの望遠端の無限遠における防振時の横収差図Transverse aberration diagram during vibration isolation at infinity at the telephoto end of the zoom lens of Example 1 実施例2のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 2 at infinity at the wide-angle end 実施例2のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the wide-angle end of the zoom lens in Example 2 実施例2のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 2 at infinity at the telephoto end 実施例2のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens of Example 2 実施例2のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 2 実施例2のズームレンズの広角端の無限遠における防振時の横収差図Lateral aberration diagram during image stabilization at infinity at the wide-angle end of the zoom lens of Example 2 実施例2のズームレンズの望遠端の無限遠における防振時の横収差図Lateral aberration diagram during vibration isolation at infinity at the telephoto end of the zoom lens of Example 2 実施例3のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 3 at infinity at the wide-angle end 実施例3のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 3 at infinity at the wide-angle end 実施例3のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram at infinity of the telephoto end of the zoom lens of Example 3 実施例3のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens of Example 3 実施例3のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 3 実施例3のズームレンズの広角端の無限遠における防振時の横収差図Lateral aberration diagram during vibration isolation at infinity at the wide-angle end of the zoom lens of Example 3 実施例3のズームレンズの望遠端の無限遠における防振時の横収差図Lateral aberration diagram during vibration isolation at infinity at the telephoto end of the zoom lens of Example 3 実施例4のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 4 at infinity at the wide-angle end 実施例4のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the wide-angle end of the zoom lens in Example 4 実施例4のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the telephoto end of the zoom lens of Example 4 実施例4のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens in Example 4 実施例4のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 4 実施例4のズームレンズの広角端の無限遠における防振時の横収差図Lateral aberration diagram during vibration isolation at infinity at the wide-angle end of the zoom lens in Example 4 実施例4のズームレンズの望遠端の無限遠における防振時の横収差図Lateral aberration diagram during vibration isolation at infinity at the telephoto end of the zoom lens of Example 4 実施例5のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 5 at infinity at the wide-angle end 実施例5のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the wide-angle end of the zoom lens in Example 5 実施例5のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram at infinity of the telephoto end of the zoom lens of Example 5 実施例5のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens in Example 5 実施例5のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 5 実施例5のズームレンズの広角端の無限遠における防振時の横収差図Lateral aberration diagram during vibration isolation at infinity at the wide-angle end of the zoom lens in Example 5 実施例5のズームレンズの望遠端の無限遠における防振時の横収差図Lateral aberration diagram during vibration isolation at infinity at the telephoto end of the zoom lens of Example 5
物体側より順に、正屈折力を有する第1レンズ群G1、負屈折力を有する第2レンズ群G2、正屈折力を有する第3レンズ群G3、正屈折力を有する第4レンズ群G4とで構成され、前記第2レンズ群G2と前記第3レンズ群G3とを光軸に沿って移動させて変倍を行う。また前記第4レンズ群G4は、物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏心させて結像位置を移動させる。 In order from the object side, the first lens group G1 having positive refractive power, the second lens group G2 having negative refractive power, the third lens group G3 having positive refractive power, and the fourth lens group G4 having positive refractive power. The second lens group G2 and the third lens group G3 are moved along the optical axis to perform zooming. The fourth lens group G4 includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power. The imaging position is moved by decentering in a direction substantially perpendicular to the axis.
本発明の防振機能を有する大口径望遠ズームレンズの第4レンズ群G4において、正屈折力を有する前群G4fは正屈折力のレンズ2個のみで構成し、球面収差とコマ収差の発生を極力抑える構成としている。また、中群G4mおよび後群G4rの合成倍率を小さくすることにより、前記中群G4mへのFナンバー光線の入射角が小さくなり、諸収差、特に高次の球面収差の発生を抑えることができる。 In the fourth lens group G4 of the large-aperture telephoto zoom lens having the image stabilization function of the present invention, the front group G4f having positive refracting power is composed of only two lenses having positive refracting power, and generates spherical aberration and coma aberration. It is configured to suppress as much as possible. Further, by reducing the composite magnification of the middle group G4m and the rear group G4r, the incidence angle of the F-number light beam on the middle group G4m is reduced, and the occurrence of various aberrations, particularly higher-order spherical aberration, can be suppressed. .
しかし、第4レンズ群G4において、中群G4mおよび後群G4rの合成倍率を小さくしすぎると、前記中群G4mの径が大きくなり、防振機構の配置が困難になる。そこで、次の条件式(1)及び(2)を満足することが望ましい。
(1)0.80<βG4mr<1.25
(2)−0.28<F4m/Ft<−0.18
F4m:前記中群G4mの焦点距離
Ft:望遠端におけるレンズ全系の焦点距離
βG4mr:すべてのズームポジションにおける前記中群G4mおよび後群G4rの合成倍率
However, in the fourth lens group G4, if the combined magnification of the middle group G4m and the rear group G4r is too small, the diameter of the middle group G4m becomes large, and it is difficult to arrange the vibration-proof mechanism. Therefore, it is desirable to satisfy the following conditional expressions (1) and (2).
(1) 0.80 <βG4mr <1.25
(2) -0.28 <F4m / Ft <-0.18
F4m: focal length of the middle group G4m Ft: focal length of the entire lens system at the telephoto end βG4mr: combined magnification of the middle group G4m and the rear group G4r at all zoom positions
条件式(1)は第4レンズ群G4における中群G4mと後群G4rの合成倍率を定めるものである。条件式(1)の上限値を越えると前記中群G4mへのFナンバー光線の入射角がきつくなり、望遠端のマージナル近傍で急激にアンダーになる球面収差の良好な補正が難しくなる。条件式(1)の下限値を越えると第4レンズ群G4全長と前記中群G4mの径の小型化を両立することができない。 Conditional expression (1) determines the composite magnification of the middle group G4m and the rear group G4r in the fourth lens group G4. If the upper limit of conditional expression (1) is exceeded, the angle of incidence of the F-number light beam on the middle group G4m will become tight, and it will be difficult to satisfactorily correct spherical aberration that suddenly becomes under the vicinity of the marginal end of the telephoto end. If the lower limit of conditional expression (1) is exceeded, it is impossible to achieve both the entire length of the fourth lens group G4 and the reduction in the diameter of the middle group G4m.
条件式(2)は第4レンズ群G4における中群G4mの焦点距離と望遠端における全系の焦点距離の比率を定めるものである。条件式(2)の上限を超えると特に望遠端において非点収差の良好な補正が困難になる。条件式(2)の下限を超えると望遠端において十分な手振れ補正角の確保が困難になる。 Conditional expression (2) defines the ratio of the focal length of the middle group G4m in the fourth lens group G4 to the focal length of the entire system at the telephoto end. Exceeding the upper limit of conditional expression (2) makes it difficult to correct astigmatism, particularly at the telephoto end. When the lower limit of conditional expression (2) is exceeded, it is difficult to secure a sufficient camera shake correction angle at the telephoto end.
本発明の防振機能を有する大口径望遠ズームレンズの第4レンズ群G4において、正屈折力のレンズ2個のみで構成されたG4fの軸上厚を厚くすることにより、中群G4mに入射する光線高を小さくしながら、特に望遠端においてアンダーな像面湾曲の補正をおこなうことができる。そこで、次の条件式(3)を満足することが望ましい。
(3)0.10<D4f/F4f<0.16
F4f:第4レンズ群前群G4fの焦点距離
D4f:第4レンズ群前群G4fの最も物体側の面と最も像側の面との光軸に沿った距離
In the fourth lens group G4 of the large-aperture telephoto zoom lens having the image stabilization function of the present invention, the axial thickness of G4f composed of only two lenses having positive refractive power is increased, so that the light enters the middle group G4m. It is possible to correct an under curvature of field particularly at the telephoto end while reducing the ray height. Therefore, it is desirable to satisfy the following conditional expression (3).
(3) 0.10 <D4f / F4f <0.16
F4f: focal length of fourth lens group front group G4f D4f: distance along the optical axis between the most object side surface and the most image side surface of fourth lens group front group G4f
条件式(3)は第4レンズ群前群G4fの焦点距離と、G4fの最も物体側の面と最も像側の面との光軸に沿った距離の比率を定めるものである。条件式(3)の上限を超えると、材料コストの増大と加工性の低下を招く。条件式(3)の下限を超えると、特に望遠端においてアンダーな像面湾曲の補正をおこなうことが困難になり、また第4レンズ群中群へ入射する光線の高さを効率的に下げることができない。 Conditional expression (3) defines the ratio of the focal length of the fourth lens unit front group G4f and the distance along the optical axis between the most object-side surface and the most image-side surface of G4f. Exceeding the upper limit of conditional expression (3) causes an increase in material cost and a decrease in workability. Exceeding the lower limit of conditional expression (3) makes it difficult to correct under field curvature, especially at the telephoto end, and to efficiently reduce the height of light incident on the fourth lens group. I can't.
また、本発明の防振機能を有する大口径望遠ズームレンズの第4レンズ群G4において、正屈折力を有する前群G4fを正屈折力レンズ2個のみから構成し、色収差補正を第4レンズ群G4全体でおこなうこととする。その際、中群G4m単独の色収差補正に対する負担が減り、材質選択の自由度が増すことから、本発明の防振機能を有する大口径望遠ズームレンズにおいて、特に以下の条件式(4)を満足することとする。
(4)1<(0.8−0.0043×ν4mn)/(N4mn−1)
N4mn:前記中群G4m、接合レンズを構成する負屈折力レンズの屈折率
ν4mn:前記中群G4m、接合レンズを構成する負屈折力レンズのアッベ数
In the fourth lens group G4 of the large-aperture telephoto zoom lens having the image stabilization function of the present invention, the front group G4f having a positive refractive power is composed of only two positive refractive power lenses, and chromatic aberration correction is performed in the fourth lens group. It will be done for the entire G4. At this time, since the burden on the chromatic aberration correction of the middle group G4m alone is reduced and the degree of freedom in selecting the material is increased, the following conditional expression (4) is particularly satisfied in the large-aperture telephoto zoom lens having the image stabilization function of the present invention. I decided to.
(4) 1 <(0.8−0.0043 × ν4mn) / (N4mn−1)
N4mn: the refractive index of the negative refractive power lens constituting the middle group G4m and the cemented lens ν4mn: the Abbe number of the negative refractive power lens constituting the middle group G4m and the cemented lens
条件式(4)は、第4レンズ群G4における中群G4mのうち、接合レンズを構成する負屈折力レンズの屈折率とアッベ数の範囲を定めるものである。条件式(4)の定める範囲内の材料は比重が軽いため、可動部である前記中群G4mの軽量化が可能である。 Conditional expression (4) defines the range of the refractive index and the Abbe number of the negative refractive power lens constituting the cemented lens among the middle group G4m in the fourth lens group G4. Since the material within the range defined by the conditional expression (4) has a low specific gravity, it is possible to reduce the weight of the middle group G4m, which is a movable part.
また、本発明の防振機能を有する大口径望遠ズームレンズにおいて、第1レンズ群G1は、物体側から順に合焦時に移動しない固定されたG1aレンズ群と、光軸上を移動させて焦点合わせを行うG1bレンズ群とで構成され、前記G1aレンズ群は、1個の負屈折力レンズと1個の正屈折力レンズを含み、G1bレンズ群は、2個の正屈折力レンズのみから構成されることを特徴とする。G1bレンズ群は正屈折力レンズのみで構成することにより、各面の曲率をゆるくすることができ、高次の球面収差発生、コマ収差の発生を抑えることができる。また、G1bレンズ群の軽量化が可能になるため合焦速度の向上が可能となる。また、好ましくは第1レンズ群G1全体を負屈折力レンズ1個、正屈折力レンズ3個で構成することで、第1レンズ群G1の全長を短くすることができ、周辺光量の確保、レンズ総重量の軽量化が可能になる。 In the large-aperture telephoto zoom lens having the image stabilization function of the present invention, the first lens group G1 is moved in focus from the object side to the fixed G1a lens group that does not move during focusing. The G1b lens group includes one negative refractive power lens and one positive refractive power lens, and the G1b lens group includes only two positive refractive power lenses. It is characterized by that. By constituting the G1b lens group only with positive refracting power lenses, the curvature of each surface can be relaxed, and the occurrence of higher-order spherical aberration and coma can be suppressed. Further, since the G1b lens group can be reduced in weight, the focusing speed can be improved. Preferably, the entire first lens group G1 is composed of one negative refracting power lens and three positive refracting power lenses, so that the overall length of the first lens group G1 can be shortened, and the amount of peripheral light is secured. The total weight can be reduced.
また、本発明の防振機能を有する大口径望遠ズームレンズにおいて、第2レンズ群G2および第3レンズ群G3より構成される変倍部の全長を短く設計することで、ズームレンズの全長のコンパクト化が可能になる。 In addition, in the large-aperture telephoto zoom lens having an image stabilization function according to the present invention, the overall length of the zooming unit composed of the second lens group G2 and the third lens group G3 is designed to be short, so that the zoom lens has a compact overall length. Can be realized.
しかし、前記変倍部の全長を短くしすぎると、第2レンズ群G2、および第3レンズ群G3それぞれのパワーが強くなり、諸収差の良好な補正が困難になる。そこで以下の条件を満足することが望ましい。
(5)0.80<L23w/Fw<0.93
L23w:広角端における前記第2レンズ群G2の先頭面から前記第3レンズ群G3の最終面の距離
Fw:広角端におけるレンズ全系の焦点距離
However, if the overall length of the zooming portion is made too short, the powers of the second lens group G2 and the third lens group G3 become strong, making it difficult to correct various aberrations. Therefore, it is desirable to satisfy the following conditions.
(5) 0.80 <L23w / Fw <0.93
L23w: Distance from the front surface of the second lens group G2 to the final surface of the third lens group G3 at the wide angle end Fw: Focal length of the entire lens system at the wide angle end
条件式(4)は、広角端における前記第2レンズ群G2の先頭面から前記第3レンズ群G3の最終面の距離と広角端におけるレンズ全系の焦点距離の比率を定めるものである。条件式(4)の上限を超えると、第2レンズ群G2、第3レンズ群G3のパワーがゆるくなり変倍時に発生する諸収差の補正には有利となるが、レンズ全長が長くなる。条件式(4)の下限を超えると、第2レンズ群G2、第3レンズ群G3のパワーが強くなり、特に変倍時に発生する球面収差の補正が困難になる。また製造時の公差に対する製品のバラつきを制御することも難しく、ズーム全域で十分な光学性能を達成することができない。 Conditional expression (4) defines the ratio of the distance from the leading surface of the second lens group G2 at the wide-angle end to the final surface of the third lens group G3 and the focal length of the entire lens system at the wide-angle end. If the upper limit of conditional expression (4) is exceeded, the powers of the second lens group G2 and the third lens group G3 become loose, which is advantageous for correcting various aberrations that occur during zooming, but the total lens length becomes long. If the lower limit of conditional expression (4) is exceeded, the power of the second lens group G2 and the third lens group G3 will become strong, and it will be difficult to correct spherical aberration that occurs particularly during zooming. In addition, it is difficult to control product variations with respect to manufacturing tolerances, and sufficient optical performance cannot be achieved over the entire zoom range.
以下に本発明変倍結像光学系にかかる数値実施例1から5を示す。 Numerical examples 1 to 5 according to the variable magnification imaging optical system of the present invention are shown below.
各数値実施例において全体諸元中のfは焦点距離。FnoはFナンバー、2ωは対角線画角を示す。レンズ諸元中の番号は物体側からのレンズの面番号、Rはレンズ面の曲率半径、Dはレンズ面間隔、ndはd線(波長587.56nm)の屈折率、νdはd線基準のアッベ数を示す。また、Bfはバックフォーカスを示す。図中のd線、g線、C線、はそれぞれの波長での収差である。ΔSはd線のサジタル像面、ΔMはd線のメリジオナル像面を示す。 In each numerical example, f in the overall specifications is a focal length. Fno indicates the F number, and 2ω indicates the diagonal field angle. The numbers in the lens specifications are the surface number of the lens from the object side, R is the radius of curvature of the lens surface, D is the distance between the lens surfaces, nd is the refractive index of the d-line (wavelength 587.56 nm), and νd is the d-line reference. Indicates the Abbe number. Bf represents back focus. In the figure, d-line, g-line, and C-line are aberrations at respective wavelengths. ΔS represents a sagittal image plane of d line, and ΔM represents a meridional image plane of d line.
実施例1において第4レンズ群は物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏芯させて結像位置を変位する構成とし、前記前群G4fは正屈折力のレンズ2個からなり、前記中群G4mは、正屈折力のレンズと負屈折力のレンズとの接合レンズと負屈折力のレンズ1個からなり、前記後群G4rは、正屈折力3個と負屈折力のレンズ1個からなる。 In Example 1, the fourth lens group includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power. The image forming position is displaced by decentering in a direction substantially perpendicular to the axis. The front group G4f includes two lenses having positive refractive power, and the middle group G4m includes a lens having positive refractive power and a negative refractive power. The rear lens group G4r is composed of three lenses having a positive refractive power and one lens having a negative refractive power.
実施例2において第4レンズ群は物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏芯させて結像位置を変位する構成とし、前記前群G4fは正屈折力のレンズ2個からなり、前記中群G4mは、正屈折力のレンズと負屈折力のレンズとの接合レンズと負屈折力のレンズ1個からなり、前記後群G4rは、正屈折力3個と負屈折力のレンズ1個からなる。 In Example 2, the fourth lens group includes, in order from the object side, a front group G4f having a positive refractive power, a middle group G4m having a negative refractive power, and a rear group G4r having a positive refractive power. The image forming position is displaced by decentering in a direction substantially perpendicular to the axis. The front group G4f includes two lenses having positive refractive power, and the middle group G4m includes a lens having positive refractive power and a negative refractive power. The rear lens group G4r is composed of three lenses having a positive refractive power and one lens having a negative refractive power.
実施例3において第4レンズ群は物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏芯させて結像位置を変位する構成とし、前記前群G4fは正屈折力のレンズ2個からなり、前記中群G4mは、正屈折力のレンズと負屈折力のレンズとの接合レンズと負屈折力のレンズ1個からなり、前記後群G4rは、正屈折力3個と負屈折力のレンズ1個からなる。 In Example 3, the fourth lens group includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power. The image forming position is displaced by decentering in a direction substantially perpendicular to the axis. The front group G4f includes two lenses having positive refractive power, and the middle group G4m includes a lens having positive refractive power and a negative refractive power. The rear lens group G4r is composed of three lenses having a positive refractive power and one lens having a negative refractive power.
実施例4において第4レンズ群は物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏芯させて結像位置を変位する構成とし、前記前群G4fは正屈折力のレンズ2個からなり、前記中群G4mは、正屈折力のレンズと負屈折力のレンズとの接合レンズと負屈折力のレンズ1個からなり、前記後群G4rは、正屈折力3個と負屈折力のレンズ1個からなる。 In Example 4, the fourth lens group includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power. The image forming position is displaced by decentering in a direction substantially perpendicular to the axis. The front group G4f includes two lenses having positive refractive power, and the middle group G4m includes a lens having positive refractive power and a negative refractive power. The rear lens group G4r is composed of three lenses having a positive refractive power and one lens having a negative refractive power.
実施例5において第4レンズ群は物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏芯させて結像位置を変位する構成とし、前記前群G4fは正屈折力のレンズ2個からなり、前記中群G4mは、正屈折力のレンズと負屈折力のレンズとの接合レンズと負屈折力のレンズ1個からなり、前記後群G4rは、正屈折力3個と負屈折力のレンズ1個からなる。 In Example 5, the fourth lens unit includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power. The image forming position is displaced by decentering in a direction substantially perpendicular to the axis. The front group G4f includes two lenses having positive refractive power, and the middle group G4m includes a lens having positive refractive power and a negative refractive power. The rear lens group G4r is composed of three lenses having a positive refractive power and one lens having a negative refractive power.
各数値実施例の変倍光学系は上記のすべての条件を満足する。 The variable magnification optical system of each numerical example satisfies all the above conditions.
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
G1a 第1レンズ群の前群
G1b 第1レンズ群の後群
G4f 第4レンズ群の前群
G4m 第4レンズ群の中群
G4r 第4レンズ群の後群
S 絞り
I 像面
d d線
g g線
C C線
ΔS サジタル像面
ΔM メリジオナル像面
G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G1a Front group G1b of the first lens group Rear group G4f of the first lens group G4m of the front group G4m of the fourth lens group Middle group G4r Rear group S of the fourth lens group I Diaphragm I Image surface d d line g g line C C line ΔS Sagittal image surface ΔM Meridional image surface

Claims (5)

  1. 物体側より順に、正屈折力を有する第1レンズ群G1、負屈折力を有する第2レンズ群G2、正屈折力を有する第3レンズ群G3、正屈折力を有する第4レンズ群G4とで構成され、前記第2レンズ群G2と前記第3レンズ群G3とを光軸に沿って移動させて変倍を行う4群ズームレンズにおいて、前記第4レンズ群G4は、物体側より順に、正屈折力を有する前群G4f、負屈折力を有する中群G4m、正屈折力を有する後群G4rより構成し、前記中群G4mを光軸と略垂直方向に偏心させて結像位置を変位する構成とし、前記前群G4fは、正屈折力のレンズ2個のみからなり、前記中群G4mは、正屈折力のレンズと負屈折力のレンズとの接合レンズと負屈折力のレンズ1個を含み、前記後群G4rは、正屈折力のレンズ3個と負屈折力のレンズ1個を含み、以下の条件を満足することを特徴とする防振機能を有する大口径望遠ズームレンズ。
    (1)0.80<βG4mr<1.25
    (2)−0.28<F4m/Ft<−0.18
    F4m:前記中群G4mの焦点距離
    Ft:望遠端におけるレンズ全系の焦点距離
    βG4mr:すべてのズームポジションにおける前記中群G4mおよび後群G4rの合成倍率
    In order from the object side, the first lens group G1 having positive refractive power, the second lens group G2 having negative refractive power, the third lens group G3 having positive refractive power, and the fourth lens group G4 having positive refractive power. In the four-group zoom lens that is configured to perform zooming by moving the second lens group G2 and the third lens group G3 along the optical axis, the fourth lens group G4 is arranged in order from the object side. It comprises a front group G4f having a refractive power, a middle group G4m having a negative refractive power, and a rear group G4r having a positive refractive power. The middle group G4m is decentered in a direction substantially perpendicular to the optical axis to displace the imaging position. The front group G4f includes only two lenses having a positive refractive power, and the middle group G4m includes a cemented lens of a lens having a positive refractive power and a lens having a negative refractive power and one lens having a negative refractive power. In addition, the rear group G4r includes three lenses having positive refractive power and negative bending It contains one power of the lens, large aperture telephoto zoom lens with a vibration reduction function that satisfies the following conditions.
    (1) 0.80 <βG4mr <1.25
    (2) -0.28 <F4m / Ft <-0.18
    F4m: focal length of the middle group G4m Ft: focal length of the entire lens system at the telephoto end βG4mr: combined magnification of the middle group G4m and the rear group G4r at all zoom positions
  2. 以下の条件を満足することを特徴とする、請求項1記載の防振機能を有する大口径望遠ズームレンズ。
    (3)0.10<D4f/F4f<0.16
    F4f:前記前群G4fの焦点距離
    D4f:前記前群G4fの最も物体側の面と最も像側の面との光軸に沿った距離
    The large-aperture telephoto zoom lens having an image stabilization function according to claim 1, wherein the following conditions are satisfied.
    (3) 0.10 <D4f / F4f <0.16
    F4f: focal length of the front group G4f D4f: distance along the optical axis between the most object side surface and the most image side surface of the front group G4f
  3. 以下の条件を満足することを特徴とする、請求項1または請求項2記載の防振機能を有する大口径望遠ズームレンズ。
    (4)1<(0.8−0.0043×ν4mn)/(N4mn−1)
    N4mn:前記中群G4m中の、接合レンズを構成する負屈折力レンズの屈折率
    ν4mn:前記中群G4m中の、接合レンズを構成する負屈折力レンズのアッベ数
    The large-aperture telephoto zoom lens having an anti-vibration function according to claim 1 or 2, wherein the following conditions are satisfied.
    (4) 1 <(0.8−0.0043 × ν4mn) / (N4mn−1)
    N4mn: Refractive index of the negative refractive power lens constituting the cemented lens in the middle group G4m ν4mn: Abbe number of the negative refractive power lens constituting the cemented lens in the middle group G4m
  4. 前記第1レンズ群G1は、物体面側から順に合焦時に移動しない固定されたG1aレンズ群と、光軸上を移動させて焦点合わせを行うG1bレンズ群とで構成され、前記G1aレンズ群は、1個の負屈折力レンズと1個の正屈折力レンズを含み、前記G1bレンズ群は、2個の正屈折力レンズのみから構成されることを特徴とする、請求項1乃至請求項3に記載の防振機能を有する大口径望遠ズームレンズ。 The first lens group G1 is composed of a fixed G1a lens group that does not move in focus from the object plane side in order, and a G1b lens group that moves on the optical axis and performs focusing, and the G1a lens group is 4. The apparatus according to claim 1, further comprising: one negative refractive power lens and one positive refractive power lens, wherein the G1b lens group includes only two positive refractive power lenses. A large-aperture telephoto zoom lens having an anti-vibration function as described in 1.
  5. 以下の条件を満足することを特徴とする、請求項1乃至請求項4のいずれかに記載の防振機能を有する大口径望遠ズームレンズ。。
    (5)0.80<L23w/Fw<0.93
    L23w:広角端における前記第2レンズ群G2の先頭面から前記第3レンズ群G3の最終面の距離
    Fw:広角端におけるレンズ全系の焦点距離
    The large-aperture telephoto zoom lens having a vibration-proof function according to any one of claims 1 to 4, wherein the following conditions are satisfied. .
    (5) 0.80 <L23w / Fw <0.93
    L23w: Distance from the front surface of the second lens group G2 to the final surface of the third lens group G3 at the wide angle end Fw: Focal length of the entire lens system at the wide angle end
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