JP6549966B2 - Zoom lens and imaging device - Google Patents

Zoom lens and imaging device Download PDF

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JP6549966B2
JP6549966B2 JP2015206174A JP2015206174A JP6549966B2 JP 6549966 B2 JP6549966 B2 JP 6549966B2 JP 2015206174 A JP2015206174 A JP 2015206174A JP 2015206174 A JP2015206174 A JP 2015206174A JP 6549966 B2 JP6549966 B2 JP 6549966B2
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zooming
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JP2017078772A (en
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伸幸 宮沢
伸幸 宮沢
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Canon Inc
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Description

本発明は、ズームレンズおよび撮像装置に関するものである。 The present invention is related to a zoom lens and an imaging device.

近年、高画質で被写界深度の浅い画を得る為に固体撮像素子の大型化が普及してきたが、カメラシステム全体の大型化を避ける為、ズームレンズはより一層の小型化が求められている。特に広角端の画角が広いズームレンズは前玉径が大きくなり易く、重量への影響も大きい事から、前玉径が小さく広角なズームレンズが望まれている。   In recent years, the enlargement of solid-state imaging devices has become widespread in order to obtain images with high image quality and shallow depth of field, but in order to avoid enlargement of the entire camera system, further miniaturization of zoom lenses is required. There is. A zoom lens having a small front lens diameter is desired because a zoom lens having a wide angle of view at a wide angle end tends to have a large front lens diameter and a large influence on weight.

従来から、小型で変倍比を効率良く確保出来るズームレンズとして、物体側より順に正、負、正の屈折力を有するレンズ群を配するズームレンズが知られている。例えば、特許文献１では物体側より順に正、負、負、絞り、正の屈折力を有するレンズ群を配し、第１レンズ群と第４レンズ群が固定で、第２レンズ群を負と正の屈折力を有するレンズ群に分割し、広角端の半画角が４０度程度のズームレンズが開示されている。特許文献２では物体側から正、負、絞り、正、負、正の屈折力を有するレンズ群を配し、第１群と第５群が固定で、広角端の半画角が４０度程度のズームレンズが開示されている。   Conventionally, as a small-sized zoom lens capable of efficiently securing a variable power ratio, a zoom lens in which lens units having positive, negative, and positive refractive power in order from the object side is known. For example, in Patent Document 1, lens units having positive, negative, negative, stop, and positive refractive power are arranged in order from the object side, and the first lens unit and the fourth lens unit are fixed, and the second lens unit is negative. A zoom lens is disclosed that is divided into lens units having positive refractive power, and the half angle of view at the wide-angle end is about 40 degrees. In Patent Document 2, a lens group having positive, negative, stop, positive, negative, positive refractive power is disposed from the object side, the first and fifth groups are fixed, and the half angle of view at the wide angle end is about 40 degrees. Zoom lens is disclosed.

特開２０１５−２２１４６号公報JP, 2015-22146, A 特開２００９−１２８６２０号公報JP, 2009-128620, A

正の屈折力を有する第１レンズ群がズーミングのためには移動せず、負の屈折力を有する第２レンズ群を像側へ移動させてズーミングを行なうズームレンズは、中間焦点距離の軸外光線が第１レンズ群内の有効径決定に影響する。その為、特許文献１では、第２レンズ群以降の合成焦点距離を望遠化し、第1レンズ群と第２レンズ群間の軸外光線角度を緩やかにして、第１レンズ群の有効径増大を抑制している。第２レンズ群以降は望遠化しているが、第１レンズ群の主点を像側へ寄せてズームレンズ全系の焦点距離は広角化されている。しかしながら、絞りより物体側のレンズ群のみでズーミングを行なっており、第１レンズ群から絞りまでの距離が長く、入射瞳が長くなる為、第１レンズ群と第２レンズ群の径が大きくなり易い。特許文献２では第２レンズ群を像側へ移動、第３レンズ群を物体側へ移動させている。絞りは第２レンズ群と第３レンズ群の間に配しズーミングに際して固定だが、広角端で第３レンズから離して物体側へ寄せて入射瞳を短く出来る為、第１レンズ群と第２レンズ群の径の増大を抑制し易い。しかしながら、ズーミングに際して第３レンズ群と第４レンズ群を大きく物体側へ移動させる為に広角端で第３レンズ群と第４レンズ群が像側に近くに位置しており、バックフォーカスが短くて交換レンズには適していない。   The zoom lens that performs zooming by moving the second lens unit having negative refractive power toward the image side while the first lens unit having positive refractive power does not move for zooming is off-axis at an intermediate focal length. A ray influences the determination of the effective diameter in the first lens group. Therefore, in Patent Document 1, the combined focal length of the second lens group and thereafter is made telephoto, and the off-axis ray angle between the first lens group and the second lens group is made gentle to increase the effective diameter of the first lens group. It is suppressing. The second lens group and thereafter are in telephoto, but the focal point of the entire zoom lens system is made wider by bringing the principal point of the first lens group closer to the image side. However, zooming is performed only with the lens unit on the object side of the stop, the distance from the first lens unit to the stop is long, and the entrance pupil is long, so the diameters of the first and second lens units become large. easy. In Patent Document 2, the second lens unit is moved to the image side, and the third lens unit is moved to the object side. The stop is arranged between the second lens group and the third lens group and fixed during zooming, but it can be moved away from the third lens and moved to the object side at the wide angle end to shorten the entrance pupil, so the first lens group and the second lens It is easy to suppress the increase in diameter of the group. However, in order to move the third lens unit and the fourth lens unit largely toward the object side during zooming, the third lens unit and the fourth lens unit are positioned close to the image side at the wide angle end, and the back focus is short. Not suitable for interchangeable lenses.

本発明は、例えば、長いバックフォーカス、広角、および小さい前玉径の点で有利なズームレンズを提供することを目的としている。 The present invention is, for example, are intended long back focus, wide-angle, and to provide a small point is advantageous zoom lens in the front lens diameter.

上記目的を達成するために、物体側より像側へ順に、最も物体側に配置されたズーミングのためには移動しない第１のレンズ群からなる、または最も物体側に配置されたズーミングのためには移動しない第１のサブレンズ群を含む２つ以上のサブレンズ群からなる前レンズ群と、３つ以上のレンズを含み、サブレンズ群を含まず、負の屈折力を有する中レンズ群と、開口絞りと、サブレンズ群を含まず、ズーミングのために移動する第１の後レンズ群と、サブレンズ群を含まず、ズーミングのために移動する第２の後レンズ群と、サブレンズ群を含まず、ズーミングのためには移動しない第３の後レンズ群と、からなるズームレンズであって、前記前レンズ群と、前記中レンズ群と、前記第１の後レンズ群と、前記第２の後レンズ群と、前記第３の後レンズ群とは、隣り合うレンズ群とレンズ群との間隔がいずれもズーミングのために変化し、かつ前記前レンズ群が２つ以上のサブレンズ群からなる場合は、さらに、隣り合うサブレンズ群とサブレンズ群との間隔、および隣り合うサブレンズ群とレンズ群との間隔がいずれもズーミングのために変化し、前記前レンズ群は、最も物体側に負レンズが配置され、４つ以上のレンズからなり、且つ正の屈折力を有する１つ以上の前記前レンズ群を構成する前記第１のレンズ群の部分またはサブレンズ群を含み、前記前レンズ群を構成する前記第１のレンズ群または前記第１のサブレンズ群のうちの一部がフォーカシングのために移動し、広角端での前記第１の後レンズ群の光軸方向の位置と望遠端での前記第１の後レンズ群の光軸方向の位置との差をＭｒ１とし、広角端での前記第２の後レンズ群の光軸方向の位置と望遠端での前記第２の後レンズ群の光軸方向の位置との差をＭｒ２とし、前記第２の後レンズ群の焦点距離をｆｒ２とし、広角端での前記ズームレンズの焦点距離をｆｗとし、Ｍｒ１は、前記第１の後レンズ群が望遠端で広角端でより像側に位置する場合に、正の符号をとるものとし、Ｍｒ２は、前記第２の後レンズ群が望遠端で広角端でより像側に位置する場合に、正の符号をとるものとして、
−０．８０＜Ｍｒ２／ｆｒ２＜０．４５
−２．０＜Ｍｒ２／ｆｗ＜０．３
−１５．０＜Ｍｒ１／Ｍｒ２＜２．０
なる条件式を満足することを特徴とする。 In order to achieve the above object, in order from the object side to the image side, the first lens group which does not move for zooming arranged closest to the object side, or for zooming arranged nearest to the object side a front lens group including two or more sub-lens group including a first sub lens group does not move, includes three or more lenses, not including sub-lens group, a lens group in having a negative refractive power , an aperture stop, free of sub lens groups, a first rear lens group that moves for zooming, not including sub-lens group, a second rear lens group that moves for zooming, sub lens unit not including, a zoom lens and a third lens group after, which does not move for zooming, said a front lens group, said in the lens group, and the first rear lens group, the second 2 rear lens group, and In the rear lens group 3, the distance between the adjacent lens group and the lens group both changes for zooming, and when the front lens group includes two or more sub lens groups, they are further adjacent to each other. The distance between the sub lens group and the sub lens group, and the distance between the adjacent sub lens group and the lens group are both changed for zooming, and in the front lens group, the negative lens is disposed closest to the object side; one consists more lenses, and includes one or more parts or sub-lens group of the first lens group constituting the front lens group having positive refractive power, the first constituting the front lens group some of the lens group or the first group of sub lenses is moved for focusing, by the position and the telephoto end of the optical axis of the first rear lens group at the wide-angle end of the first of optical axis direction of the rear lens group The difference between the position and Mr1, a difference between the optical axis direction position of the second rear lens group at position and the telephoto end of the optical axis of the second rear lens group at the wide angle end and Mr2, The focal length of the second rear lens group is fr2 , the focal length of the zoom lens at the wide-angle end is fw, and the first rear lens group at the telephoto end is closer to the image side at the wide-angle end when, it is assumed that a positive sign, Mr2, when the second rear lens group is located more image side at the wide-angle end at the telephoto end, as a positive sign,
−0.80 <Mr2 / fr2 <0.45
−2.0 <Mr2 / fw <0.3
-15.0 <Mr1 / Mr2 <2.0
It is characterized by satisfying the following conditional expression .

本発明によれば、例えば、長いバックフォーカス、広角、および小さい前玉径の点で有利なズームレンズを提供することができる。
According to the present invention, for example, it is possible to provide a zoom lens that is advantageous in terms of long back focus , wide angle , and small front lens diameter.

数値実施例１の光学系のレンズ断面図である。FIG. 2 is a lens cross-sectional view of the optical system of Numerical Embodiment 1. 数値実施例１の広角端における収差図である。5 is an aberration diagram at the wide-angle end of Numerical Embodiment 1. FIG. 数値実施例１の中間焦点距離における収差図である。5 is an aberration diagram at an intermediate focal length of Numerical Embodiment 1. FIG. 数値実施例１の望遠端における収差図である。FIG. 7 shows aberration diagrams at the telephoto end of Numerical Embodiment 1. 数値実施例２の光学系のレンズ断面図である。FIG. 7 is a lens cross-sectional view of the optical system of Numerical Embodiment 2. 数値実施例２の広角端における収差図である。FIG. 7 shows aberration diagrams at the wide angle end of Numerical Embodiment 2. 数値実施例２の中間焦点距離における収差図である。FIG. 7 is an aberration diagram at an intermediate focal length of Numerical Embodiment 2. 数値実施例２の望遠端における収差図である。FIG. 7 shows aberration diagrams at the telephoto end of Numerical Embodiment 2. 数値実施例３の光学系のレンズ断面図である。FIG. 10 is a lens cross-sectional view of the optical system of Numerical Embodiment 3. 数値実施例３の広角端における収差図である。FIG. 10 shows aberration diagrams at the wide angle end of Numerical Embodiment 3. 数値実施例３の中間焦点距離における収差図である。FIG. 18 shows aberration diagrams at the intermediate focal length of Numerical Embodiment 3. 数値実施例３の望遠端における収差図である。FIG. 13 shows aberration diagrams at the telephoto end of Numerical Embodiment 3. 数値実施例４の光学系のレンズ断面図である。FIG. 16 is a lens cross-sectional view of the optical system of Numerical Embodiment 4. 数値実施例４の広角端における収差図である。FIG. 20 shows aberration diagrams at the wide angle end of Numerical Embodiment 4. 数値実施例４の中間焦点距離における収差図である。FIG. 18 shows aberration diagrams at the intermediate focal length of Numerical Embodiment 4. 数値実施例４の望遠端における収差図である。FIG. 18 shows aberration diagrams at the telephoto end of Numerical Embodiment 4. 本発明の撮像装置の実施形態を説明する為の図である。It is a figure for describing embodiment of the imaging device of this invention.

本発明のズームレンズは、物体側より像側へ順に、前レンズ群、３枚以上のレンズを含み負の屈折力を有するＮｆレンズ群、開口絞り、ズーミングに際して移動する第１の後レンズ群、ズーミングに際して移動する第２の後レンズ群、ズーミングのためには移動しない第３の後レンズ群、を含む。また、前レンズ群は、最も物体側に配置されたズーミングのためには移動しない第１のレンズ群を含む１つ以上のレンズ群から構成され、４枚以上のレンズを含み、且つ正の屈折力を有する１つ以上のレンズ群を含むことを特徴とする。   The zoom lens according to the present invention includes, in order from the object side to the image side, a front lens group, an Nf lens group having negative refracting power including three or more lenses, an aperture stop, and a first rear lens group that moves during zooming It includes a second rear lens group that moves during zooming, and a third rear lens group that does not move for zooming. Also, the front lens group is composed of one or more lens groups including the first lens group that does not move for zooming disposed closest to the object side, includes four or more lenses, and has positive refraction. It is characterized by including one or more lens groups having power.

本発明では、開口絞りより物体側に少なくとも一つの正の屈折力を有するレンズ群と少なくとも一つの負の屈折力を有するレンズ群を有し、前記正と負の屈折力を有するレンズ群の間隔変化でズーミング可能な構成としている。   In the present invention, the distance between the lens group having the positive and negative refractive powers is a lens group having at least one positive refractive power and a lens group having at least one negative refractive power on the object side of the aperture stop. It is configured to be zoomable by change.

最も物体側に配される第１レンズ群は重い為、ズーミングのためには移動せず、ズーミングに必要な駆動力の増加を防いでいる。   Since the first lens unit disposed closest to the object side is heavy, it does not move for zooming, and prevents an increase in driving force necessary for zooming.

開口絞りの物体側に隣接して配置されるＮｆレンズ群は負の屈折力を有するレンズ群とする事で入射瞳を短くして前玉径増大を抑制している。また、Ｎｆレンズ群は少なくとも３枚のレンズを有し、ズーミングの際の像面湾曲や倍率色収差の変動を補正できる構成としている。   The Nf lens unit disposed adjacent to the object side of the aperture stop is a lens unit having negative refractive power, thereby shortening the entrance pupil and suppressing an increase in the front lens diameter. In addition, the Nf lens group has at least three lenses, and is configured to be able to correct variations in curvature of field and chromatic aberration of magnification during zooming.

開口絞りより物体側はＮｆレンズ群を除くと少なくとも４枚のレンズを有し（前レンズ群は少なくとも４枚のレンズから構成され）、広角端の歪曲収差や望遠端の軸上色収差を補正できる構成としている。   The object side of the aperture stop has at least four lenses excluding the Nf lens group (the front lens group consists of at least four lenses), and can correct distortion at the wide-angle end and axial chromatic aberration at the telephoto end. It has composition.

開口絞りより像側には、物体側から像側へ順に、第１の後レンズ群、第２の後レンズ群、第３の後レンズ群の３つのレンズ群を有し、第１の後レンズ群と第２の後レンズ群をズーミングに際して移動させている。開口絞りより像側のレンズ群にズーミング効果を持たせる事で、ズーミングに際して開口絞りより物体側のレンズ群の移動量が短くなる。その結果、開口絞りを物体側に近づけて配置する事が可能となり、入射瞳が短くなる為、前玉径の大型化が抑制出来る。   The first rear lens unit includes three lens units, ie, a first rear lens group, a second rear lens group, and a third rear lens group, in order from the object side to the image side, on the image side of the aperture stop. The lens group and the second rear lens group are moved during zooming. By giving the zooming effect to the lens group on the image side of the aperture stop, the amount of movement of the lens group on the object side of the aperture stop becomes shorter during zooming. As a result, the aperture stop can be disposed close to the object side, and the entrance pupil becomes short, so that the enlargement of the front lens diameter can be suppressed.

第３の後レンズ群はズーミングのためには移動しない。移動によりバックフォーカスが短くなるのを防ぐと共に、製造誤差によりバックフォーカスがずれた際に、最終群全体もしくは一部を光軸方向に調整する事でズーミング位置によらず一定の量だけバックフォーカス調整を可能としている。   The third rear lens unit does not move for zooming. In addition to preventing the back focus from being shortened due to movement, when the back focus is shifted due to a manufacturing error, back focus adjustment by a fixed amount regardless of the zooming position by adjusting the whole or a part of the final group in the optical axis direction Is possible.

更に、次の条件式を満足している。
−０．８０＜Ｍｒ２／ｆｒ２＜０．４５ …（１）
但し、Ｍｒ２は第２の後レンズ群の広角端と望遠端の光軸方向の位置差、ｆｒ２は第２の後レンズ群の焦点距離、Ｍｒ２は広角端に対して望遠端で像側に位置する場合に正の符号とする。 Furthermore, the following conditional expressions are satisfied.
−0.80 <Mr2 / fr2 <0.45 (1)
Where Mr2 is the positional difference between the second rear lens group at the wide angle end and the telephoto end in the optical axis direction, fr2 is the focal length of the second rear lens group, and Mr2 is the image side at the telephoto end with respect to the wide angle end. If you want to use a positive code.

条件式（１）は第２の後レンズ群の広角端と望遠端の光軸方向の位置差と第２の後レンズ群の焦点距離の比を規定した式である。条件式（１）の上限値を超えても下限値を超えても、第２の後レンズ群の屈折力が大きくなり、歪曲収差や像面湾曲のズーミング時の変動が増加してしまう。   Conditional expression (1) defines the ratio of the positional difference between the second rear lens unit at the wide-angle end and the telephoto end in the optical axis direction and the focal length of the second rear lens unit. Even if the upper limit value of the conditional expression (1) is exceeded or the lower limit value is exceeded, the refractive power of the second rear lens group is increased, and the variation of the distortion and the curvature of field during zooming increases.

更に、以下の条件式を満足している。
−２．０＜Ｍｒ２／ｆｗ＜０．３ …（２）
但し、ｆｗは広角端の焦点距離とする。 Furthermore, the following conditional expressions are satisfied.
−2.0 <Mr2 / fw <0.3 (2)
Where fw is the focal length at the wide angle end.

条件式（２）は第２の後レンズ群の広角端と望遠端の光軸方向の位置差と広角端の焦点距離の比を規定した式である。条件式（２）の上限値を超えた場合、第２の後レンズ群と第３の後レンズ群との間隔が広角端で広くなる為、全長が長くなり好ましくない。逆に下限値を超えた場合、第２の後レンズ群が第３の後レンズ群の移動を妨げてしまい、ズーミングの際の球面収差や像面湾曲の変動を抑制する事が困難となる。   Conditional expression (2) defines the ratio of the positional difference between the wide-angle end and the telephoto end of the second rear lens unit in the optical axis direction and the focal length of the wide-angle end. If the upper limit value of the conditional expression (2) is exceeded, the distance between the second rear lens unit and the third rear lens unit becomes wider at the wide-angle end, so the overall length becomes undesirably long. Conversely, if the lower limit value is exceeded, the second rear lens group hinders the movement of the third rear lens group, and it becomes difficult to suppress the variation of spherical aberration and field curvature during zooming.

更に、以下の条件式を満足している。
−１５．０＜Ｍｒ１／Ｍｒ２＜２．０ …（３）
但し、Ｍｒ１は第１の後レンズ群の広角端と望遠端の光軸方向の位置差、Ｍｒ１は広角端に対して望遠端で像側に位置する場合に正の符号とする。 Furthermore, the following conditional expressions are satisfied.
-15.0 <Mr1 / Mr2 <2.0 (3)
However, Mr1 is a position difference between the wide-angle end and the telephoto end in the optical axis direction of the first rear lens group, and Mr1 is a positive code when it is positioned on the image side at the telephoto end with respect to the wide-angle end.

条件式（３）は第１の後レンズ群の広角端と望遠端の光軸方向の位置差と第２の後レンズ群の広角端と望遠端の光軸方向の位置差を規定した式である。条件式（３）の上限値を超えても下限値を超えても、第２の後レンズ群の移動量が小さく、ズーミングの際の球面収差や像面湾曲の変動を抑制する事が困難となる。   Conditional expression (3) defines the positional difference between the first rear lens group at the wide-angle end and the telephoto end in the optical axis direction and the positional difference between the second rear lens group at the wide-angle end and the telephoto end in the optical axis direction. is there. Even if it exceeds the upper limit value or the lower limit value of the conditional expression (3), the moving amount of the second rear lens group is small, and it is difficult to suppress the variation of the spherical aberration and the curvature of field during zooming. Become.

以上で本発明の目的は達成されるが、本発明は、以下の条件式を満足するのが望ましい。
１．０＜｜ｆｒ１｜／ｆｗ＜１５．０ …（４）
但し、ｆｒ１は第１の後レンズ群の焦点距離とする。 Although the object of the present invention is achieved by the above, it is desirable that the present invention satisfies the following conditional expression.
1.0 <| fr1 | / fw <15.0 (4)
Where fr1 is the focal length of the first rear lens group.

条件式（４）は第１の後レンズ群の焦点距離と広角端の焦点距離の比を規定した式である。条件式（４）の上限値を超えた場合、ズーミングの際の像面補正の為に第２の後レンズ群で移動軌跡が限定され、ズーミングの際の像面湾曲や倍率色収差の変動の抑制が困難となる。逆に下限値を超えた場合、球面収差の補正が困難となる。   Conditional expression (4) defines the ratio of the focal length of the first rear lens unit to the focal length at the wide-angle end. If the upper limit value of the conditional expression (4) is exceeded, the movement locus is limited in the second rear lens unit for image plane correction at the time of zooming, and the fluctuation of curvature of field and lateral chromatic aberration at the time of zooming is suppressed. Is difficult. Conversely, if the lower limit value is exceeded, correction of spherical aberration becomes difficult.

また、本発明は、以下の条件式を満足するのが望ましい。
１．０＜｜ｆｒ２｜／ｆｗ＜５．５ …（５）
条件式（５）は第２の後レンズ群の焦点距離と広角端の焦点距離の比を規定した式である。条件式（４）の上限値を超えた場合、ズーミングの際の像面補正の為に第１の後レンズ群で移動軌跡が限定され、ズーミングの際の球面収差や像面湾曲の変動の抑制が困難となる。逆に下限値を超えた場合、倍率色収差や像面湾曲の補正が困難となる。 In the present invention, it is desirable that the following conditional expressions be satisfied.
1.0 <| fr2 | / fw <5.5 (5)
Conditional expression (5) defines the ratio of the focal length of the second rear lens unit to the focal length at the wide-angle end. If the upper limit value of conditional expression (4) is exceeded, the movement locus is limited by the first rear lens unit for image plane correction at the time of zooming, and the fluctuation of spherical aberration and field curvature at the time of zooming is suppressed. Is difficult. Conversely, if the lower limit value is exceeded, correction of lateral chromatic aberration and field curvature becomes difficult.

また、本発明は、第１の後レンズ群と第２の後レンズ群の少なくとも一方の群は、正の屈折力を有し広角端に対して望遠端で物体側に位置するのが望ましい。   In the present invention, it is desirable that at least one of the first rear lens group and the second rear lens group has positive refractive power and be positioned on the object side at the telephoto end with respect to the wide angle end.

開口絞りより物体側の正の屈折力を有するレンズ群とＮｆレンズ群との間隔変化だけではなく、Ｎｆレンズ群と開口絞りより像側の正の屈折力を有するレンズ群との間隔変化でもズーミングさせる事が可能となり、短いレンズ全長の中で効率良くズーミングが可能となる。   Zooming is not limited to changes in the distance between the Nf lens group and the lens group having positive refractive power on the object side of the aperture stop, as well as changes in the distance between the Nf lens group and the lens group having positive refractive power on the image side than the aperture stop. It is possible to zoom in efficiently within a short lens overall length.

また、本発明は、ズーミングのためには開口絞りは光軸方向に移動しないことが望ましい。
開口絞りを光軸方向に移動させるには鏡筒構造や電気配線の引き回しが煩雑になる為、好ましくない。 Further, in the present invention, it is desirable that the aperture stop does not move in the optical axis direction for zooming.
It is not preferable to move the aperture stop in the optical axis direction because the lens barrel structure and the wiring of the electrical wiring become complicated.

また、本発明は、第１レンズ群内の一部でフォーカシングを行なうのが望ましい。
固定の第１レンズ群内でフォーカシングする事で、ズーミング位置によらずフォーカス群の移動量が一定となり、簡素な鏡筒構造でもズーミング位置によらずマニュアル操作時の操作環の回転角を一定にする事が出来る。また、製造誤差が生じた際、第１レンズ以外の群の焦点距離誤差があってもフォーカスの移動量は変化しない為、無限遠から所望の被写体距離までの操作環の回転角の製造誤差も少ない。 Further, in the present invention, it is desirable to perform focusing in a part of the first lens group.
By focusing in the fixed first lens group, the moving amount of the focusing group becomes constant regardless of the zooming position, and the rotation angle of the operation ring at the time of manual operation is made constant regardless of the zooming position even with a simple lens barrel structure. You can do it. Also, when a manufacturing error occurs, the amount of movement of focus does not change even if there is a focal distance error of the groups other than the first lens, so the manufacturing error of the rotation angle of the operation ring from infinity to the desired object distance is also small .

また、本発明は、以下の条件式を満足するのが望ましい。
０．４４＜｜ｆｒ１／ｆｒ２｜＜４．９１ …（６）
条件式（６）は第１の後レンズ群の焦点距離と第２の後レンズ群の焦点距離の比を規定した式である。条件式（６）の上限値を超えた場合、ズーミングの際の像面湾曲や倍率色収差の変動の抑制が困難となる。逆に下限値を超えた場合、球面収差の補正が困難となる In the present invention, it is desirable that the following conditional expressions be satisfied.
0.44 <| fr1 / fr2 | <4.91 (6)
Conditional expression (6) defines the ratio of the focal length of the first rear lens unit to the focal length of the second rear lens unit. If the upper limit value of the conditional expression (6) is exceeded, it is difficult to suppress the fluctuation of the curvature of field and the chromatic aberration of magnification during zooming. Conversely, if the lower limit value is exceeded, it will be difficult to correct spherical aberration.

なお、条件式（１）〜（４）の数値範囲は以下の如く特定するのが更に望ましい。
−０．４１＜Ｍｒ２／ｆｒ２＜０．４３ …（１ａ）
−１．６＜Ｍｒ２／ｆｗ＜０．１ …（２ａ）
−１４．２＜Ｍｒ１／Ｍｒ２＜１．３ …（３ａ）
１．４＜｜ｆｒ１｜／ｆｗ＜１２．５ …（４ａ）
２．５＜｜ｆｒ２｜／ｆｗ＜５．３ …（５ａ）
０．４７＜｜ｆｒ１／ｆｒ２｜＜４．６９ …（６ａ） It is more desirable to specify the numerical ranges of the conditional expressions (1) to (4) as follows.
−0.41 <Mr2 / fr2 <0.43 (1a)
−1.6 <Mr2 / fw <0.1 (2a)
-14.2 <Mr1 / Mr2 <1.3 (3a)
1.4 <| fr1 | / fw <12.5 (4a)
2.5 <| fr2 | / fw <5.3 (5a)
0.47 <| fr1 / fr2 | <4.69 (6a)

以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

図１、５、９、１３は、後述する数値実施例１〜４のレンズ断面図、図２〜４、６〜８、１０〜１２、１４〜１６はそれぞれ各数値実施例の収差図である。図２〜４、６〜８、１０〜１２、１４〜１６において、図２、６、１０、１４は広角端における収差図、図３、７、１１、１５は中間焦点距離における収差図、図４、８、１２、１６は望遠端における収差図である。収差図において、ｄ、ｇはｄ線及びｇ線、Ｍ、Ｓはメリジオナル像面、サジタル像面、倍率色収差はｇ線によって表している。   1, 5, 9, and 13 are lens cross-sectional views of Numerical Embodiments 1 to 4 described later, and FIGS. 2 to 4, 6 to 8, 10 to 12, and 14 to 16 are aberration diagrams of the respective Numerical Examples. . 2, 6, 10, 14 are aberration diagrams at the wide-angle end, and FIGS. 3, 7, 11, 15 are aberration diagrams at the intermediate focal length, 4, 8, 12, and 16 are aberration diagrams at the telephoto end. In the aberration diagrams, d and g represent d and g lines, M and S represent a meridional image plane, a sagittal image plane, and lateral chromatic aberration are represented by g lines.

図１、５、９、１３のレンズ断面図において、Ｌ１〜Ｌ６はそれぞれ第１〜６レンズ群、ＳＰは開口絞り、ＳＰ２は開放Ｆ値を決定する為に開口径を変化させる補助絞り、ＰはＣＣＤのフェースプレートやローパスフィルター等のガラスブロック、Ｉは像面である。   In the lens cross-sectional views of FIGS. 1, 5, 9, and 13, L1 to L6 denote first to sixth lens groups, SP denotes an aperture stop, and SP2 denotes an auxiliary stop that changes the aperture diameter to determine the open F value. Is a glass block such as a CCD face plate or low pass filter, and I is an image plane.

実施例１、３，４においては、第１レンズ群Ｌ１が前レンズ群に対応し、第２レンズ群Ｌ２がＮｆレンズ群、第３レンズ群Ｌ３が第１の後レンズ群、第４レンズ群Ｌ４が第２の後レンズ群、第５レンズ群Ｌ５が第３の後レンズ群に対応する。実施例２においては、第１レンズ群Ｌ１と第２レンズ群Ｌ２が前レンズ群を構成し、第３レンズ群Ｌ３がＮｆレンズ群、第４レンズ群Ｌ４が第１の後レンズ群、第５レンズ群Ｌ５が第２の後レンズ群、第６レンズ群Ｌ６が第３の後レンズ群に対応する。実施例２においては、前レンズ群内で正の屈折力を有するレンズ群は第２レンズ群であり、第１レンズ群は負の屈折力を有する。   In Examples 1, 3 and 4, the first lens group L1 corresponds to the front lens group, the second lens group L2 is the Nf lens group, the third lens group L3 is the first rear lens group, and the fourth lens group L4 corresponds to the second rear lens group, and the fifth lens group L5 corresponds to the third rear lens group. In Example 2, the first lens unit L1 and the second lens unit L2 constitute a front lens unit, the third lens unit L3 is an Nf lens unit, the fourth lens unit L4 is a first rear lens unit, and The lens unit L5 corresponds to the second rear lens unit, and the sixth lens unit L6 corresponds to the third rear lens unit. In Example 2, the lens unit having positive refractive power in the front lens unit is the second lens unit, and the first lens unit has negative refractive power.

補助絞りを有している実施例１、２は、補助絞りの用いずに開口絞りの開放径をズーミング位置によって変化させても良い。本実施形態においては、広角端から望遠端への変倍に際して、図１、５、９、１３、の矢印のように各群を移動させている。実施例１、３、４では第１レンズ群中の物体側から４枚目のレンズを移動させてフォーカシングを行なっている。実施例２では第１レンズ群中の物体側から２枚目と３枚目を一体で移動させてフォーカシングを行なっている。また、最終レンズ群（実施例１、３、４の第５レンズ群、実施例２の第６レンズ群）もしくは最終レンズ群内の一部を光軸方向に移動させる事でバックフォーカスの調整が可能である。   In the first and second embodiments having the auxiliary stop, the opening diameter of the aperture stop may be changed according to the zooming position without using the auxiliary stop. In the present embodiment, upon zooming from the wide-angle end to the telephoto end, the respective groups are moved as shown by the arrows in FIGS. In the first, third, and fourth embodiments, focusing is performed by moving the fourth lens from the object side in the first lens group. In the second embodiment, focusing is performed by integrally moving the second and third sheets from the object side in the first lens group. In addition, the back focus adjustment can be performed by moving the last lens group (the fifth lens group of Examples 1, 3 and 4 and the sixth lens group of Example 2) or a part of the last lens group in the optical axis direction. It is possible.

以下に本発明の数値実施例を記載する。   Hereinafter, numerical examples of the present invention will be described.

数値実施例において、ｒｉは物体側より順に第ｉ目の面の曲率半径、ｄｉ第ｉ目の面と第ｉ＋１番目の面の間隔（レンズ厚あるいは空気間隔）、ｎｄｉとνｄｉはそれぞれ第ｉ番目のレンズの材質の屈折率とアッベ数である。   In the numerical example, ri is the radius of curvature of the i-th surface, the distance between the i-th surface and the (i + 1) -th surface (lens thickness or air distance), ndi and didi are each the i-th The refractive index and Abbe number of the lens material of

非球面形状は、光軸方向にＸ軸、光軸と垂直方向ｈ軸、光の進行方向を正とし、Ｒを近軸曲率半径、各非球面係数をｋ、Ａ４、Ａ６、Ａ８、Ａ１０、Ａ１２、Ａ１４、Ａ１６としたとき、

Figure 0006549966
なる式で表している。
また、例えば「ｅ−Ｚ」の表示は「１０−Ｚ」を意味する。
半画角は光線追跡で求めた値である。ＢＦはバックフォーカスである。
For the aspheric surface shape, the X axis in the optical axis direction, the h axis perpendicular to the optical axis, the traveling direction of light is positive, R is a paraxial radius of curvature, and each aspheric surface coefficient is k, A4, A6, A8, A10, When A12, A14, A16,
Figure 0006549966
 It is expressed by the following formula.
Also, for example, the indication of "e-Z" means "10-Z".
The half angle of view is a value obtained by ray tracing. BF is the back focus.

（数値実施例１）
単位 mm

面データ
面番号 r d nd vd
1* 95.971 2.25 1.77250 49.6
2 25.008 18.76
3 -46.148 2.24 1.59522 67.7
4 -208.758 0.86
5 89.944 4.49 1.85478 24.8
6 -3391.978 1.10
7 71.585 6.51 1.48749 70.2
8* -112.413 7.72
9 1244.744 1.48 1.85478 24.8
10 44.958 0.78
11 56.753 5.34 1.49700 81.5
12 -117.331 0.17
13 72.173 5.31 1.72000 50.2
14 -89.503 (可変)
15 156.184 0.98 1.91082 35.3
16 28.295 2.14
17 342.322 0.90 1.58913 61.1
18 23.925 3.65 1.80809 22.8
19 195.693 1.79
20 -41.778 0.91 1.80400 46.6
21 -170.760 (可変)
22(開口絞り) ∞ 1.50
23(補助絞り) ∞ (可変)
24 28.270 4.15 1.55332 71.7
25* 156.238 (可変)
26 40.158 1.23 1.85478 24.8
27 27.673 1.64
28 44.510 4.34 1.49700 81.5
29 -57.595 (可変)
30 106.538 0.99 2.00069 25.5
31 53.892 1.49
32 951.384 1.00 1.53996 59.5
33 31.516 2.40 1.95906 17.5
34 44.832 6.13
35 89.410 4.48 1.49700 81.5
36 -65.111 0.17
37 97.933 5.81 1.49700 81.5
38 -30.528 1.14 1.80610 33.3
39 -119.681 (可変)
40 ∞ 2.39 1.51633 64.1
41 ∞ 0.50
42 ∞ 1.00
像面 ∞

非球面データ
第1面
K = 6.75370e+000 A 4= 1.49928e-006 A 6=-1.36094e-010 A 8=-2.25783e-012 A10= 2.94187e-015 A12=-1.92140e-018

第8面
K = 7.11393e-001 A 4= 9.77054e-007 A 6=-7.78879e-010 A 8=-2.85446e-012 A10= 5.55537e-015 A12=-5.06973e-018

第25面
K =-2.45680e+000 A 4= 7.68788e-006 A 6=-1.82317e-009 A 8= 2.96287e-011 A10=-1.51304e-013 A12= 2.06060e-016

各種データ
ズーム比 4.29

焦点距離 18.54 32.08 79.52
Fナンバー 4.12 4.12 4.12
半画角 38.60 24.77 10.54
像高 14.80 14.80 14.80
レンズ全長 221.38 221.38 221.38
BF 48.70 48.70 48.70

d14 0.93 16.87 32.81
d21 33.64 17.70 1.76
d23 17.93 14.57 1.46
d25 13.79 8.58 2.07
d29 2.55 11.13 30.74
d39 45.62 45.62 45.62

ズームレンズ群データ
群 始面 焦点距離
1 1 51.80
2 15 -28.12
3 22 ∞
4 24 61.67
5 26 94.37
6 30 3422.50
7 40 ∞
(Numerical Example 1)
Unit mm

Surface data surface number rd nd vd
1 * 95.971 2.25 1.77250 49.6
2 25.008 18.76
3 -46.148 2.24 1.59522 67.7
4 -208.758 0.86
5 89.944 4.49 1.85478 24.8
6-3391.978 1.10
7 71.585 6.51 1.48749 70.2
8 * -112.413 7.72
9 1244.744 1.48 1.85478 24.8
10 44.958 0.78
11 56.753 5.34 1.49700 81.5
12 -117.331 0.17
13 72.173 5.31 1.72000 50.2
14 -89.503 (variable)
15 156.184 0.98 1.91082 35.3
16 28.295 2.14
17 342.322 0.90 1.5891 13 61.1
18 23.925 3.65 1.80809 22.8
19 195.693 1.79
20 -41.778 0.91 1.80400 46.6
21 -170.760 (variable)
22 (aperture stop) 1. 1.50
23 (auxiliary stop) ∞ (variable)
24 28.270 4.15 1.55332 71.7
25 * 156.238 (variable)
26 40.158 1.23 1.85478 24.8
27 27.673 1.64
28 44.510 4.34 1.49700 81.5
29 -57.595 (variable)
30 106.538 0.99 2.00069 25.5
31 53.892 1.49
32 951.384 1.00 1.53996 59.5
33 31.516 2.40 1.95906 17.5
34 44.832 6.13
35 89.410 4.48 1.49700 81.5
36 -65.111 0.17
37 97.933 5.81 1.49700 81.5
38-30.528 1.14 1.80610 33.3
39 -119.681 (variable)
40 ∞ 2.39 1.51633 64.1
41 ∞ 0.50
42 1.00
Image plane ∞

Aspheric data first surface
K = 6.75370e + 000 A 4 = 1.49928e-006 A 6 = -1.36094e-010 A 8 =-2.25783e-012 A10 = 2.94187e-015 A12 =-1.92140e-018

Eighth side
K = 7.11393e-001 A 4 = 9.77054e-007 A 6 =-7.78879e-010 A 8 =-2.85446e-012 A10 = 5.55537e-015 A12 =-5.06973e-018

25th
K = -2.45680 e + 000 A 4 = 7.68 788 e-006 A 6 = -1.82317 e-009 A 8 = 2.96287 e-011 A10 = -1.51304 e-013 A12 = 2.06060e-016

Various data Zoom ratio 4.29

Focal length 18.54 32.08 79.52
F number 4.12 4.12 4.12
Half angle of view 38.60 24.77 10.54
Image height 14.80 14.80 14.80
Lens total length 221.38 221.38 221.38
BF 48.70 48.70 48.70

d14 0.93 16.87 32.81
d21 33.64 17.70 1.76
d23 17.93 14.57 1.46
d25 13.79 8.58 2.07
d29 2.55 11.13 30.74
d39 45.62 45.62 45.62

Zoom lens group data group Start focal length
1 1 51.80
2 15 -28.12
3 22 ∞
4 24 61.67
5 26 94.37
6 30 3422.50
7 40 ∞

（数値実施例２）
単位 mm

面データ
面番号 r d nd vd
1* 69.375 2.40 1.58313 59.4
2 25.762 24.85
3 -79.941 1.67 1.69680 55.5
4 71.806 0.17
5 61.521 3.25 1.80518 25.4
6 215.702 (可変)
7 177.549 1.55 1.92286 18.9
8 49.395 4.27 1.80400 46.6
9 -122.318 0.17
10 63.868 3.21 1.59522 67.7
11 -208.494 0.17
12 59.430 2.89 1.49700 81.5
13 -428.708 (可変)
14(補助絞り) ∞ 1.50
15 -46.620 0.70 1.77250 49.6
16 59.718 1.35
17 -51.615 0.72 1.90043 37.4
18 27.561 2.62 1.92286 18.9
19 -324.069 2.56
20(開口絞り) ∞ (可変)
21 62.849 0.80 1.77250 49.6
22 21.365 4.87 1.53775 74.7
23 -40.044 0.17
24* 28.094 3.18 1.49710 81.6
25* -122.434 (可変)
26 81.102 3.09 1.69680 55.5
27 -32.436 0.17
28 -39.287 0.80 1.63930 44.9
29 19.795 (可変)
30 48.924 5.79 1.49700 81.5
31 -36.092 0.17
32 -41.516 1.11 1.62588 35.7
33 -1352.163 (可変)
34 ∞ 2.39 1.51633 64.1
35 ∞ 0.50
36 ∞ 1.00
像面 ∞

非球面データ
第1面
K = 2.65155e+000 A 4= 1.43592e-006 A 6=-1.45741e-010 A 8= 1.74224e-013

第24面
K = 6.48243e-001 A 4=-4.64544e-006 A 6= 2.87036e-011 A 8= 2.63846e-011

第25面
K =-8.47515e+001 A 4=-2.24737e-007 A 6= 1.92717e-008 A 8= 3.74377e-011

各種データ
ズーム比 4.15

焦点距離 18.54 35.72 77.00
Fナンバー 4.12 4.12 4.12
半画角 38.60 22.50 10.88
像高 14.80 14.80 14.80
レンズ全長 178.77 178.77 178.77
BF 39.44 39.44 39.44

d 6 41.08 21.52 1.97
d13 0.84 10.10 27.81
d20 14.65 8.80 2.10
d25 6.32 4.73 7.49
d29 2.24 19.96 25.75
d33 36.36 36.36 36.36

ズームレンズ群データ
群 始面 焦点距離
1 1 -38.29
2 7 33.15
3 14 -22.85
4 21 27.88
5 26 -56.80
6 30 106.33
7 34 ∞
(Numerical Example 2)
Unit mm

Surface data surface number rd nd vd
1 * 69.375 2.40 1.58313 59.4
2 25.762 24.85
3 -79.941 1.67 1.69680 55.5
4 71.806 0.17
5 61.521 3.25 1.80518 25.4
6 215.702 (variable)
7 177.549 1.55 1.92286 18.9
8 49.395 4.27 1.80400 46.6
9-122.318 0.17
10 63.868 3.21 1.59522 67.7
11 -208.494 0.17
12 59.430 2.89 1.49700 81.5
13 -428.708 (variable)
14 (auxiliary stop) ∞ 1.50
15-46.620 0.70 1.77250 49.6
16 59.718 1.35
17-51.615 0.72 1.90043 37.4
18 27.561 2.62 1.92286 18.9
19-324.069 2.56
20 (aperture stop) ((variable)
21 62.849 0.80 1.77250 49.6
22 21.365 4.87 1.53775 74.7
23-40.044 0.17
24 * 28.094 3.18 1.49710 81.6
25 * -122.434 (variable)
26 81.102 3.09 1.69680 55.5
27 -32.436 0.17
28 -39.287 0.80 1.63930 44.9
29 19.795 (variable)
30 48.924 5.79 1.49700 81.5
31-36.092 0.17
32-41.516 1.11 1.62588 35.7
33 -1352.163 (variable)
34 ∞ 2.39 1.51633 64.1
35 ∞ 0.50
36 1.00
Image plane ∞

Aspheric data first surface
K = 2.65155e + 000A 4 = 1.43592e-006 A 6 = −1.45741e-010 A 8 = 1.74224e-013

24th
K = 6.48243e-001 A 4 = -4.66454e-006 A 6 = 2.87036e-011 A 8 = 2.63846e-011

25th
K = -8.47515e + 001 A 4 =-2.24737e-007 A 6 = 1.92717e-008 A 8 = 3.74377e-011

Various data zoom ratio 4.15

Focal length 18.54 35.72 77.00
F number 4.12 4.12 4.12
Half angle of view 38.60 22.50 10.88
Image height 14.80 14.80 14.80
Lens total length 178.77 178.77 178.77
BF 39.44 39.44 39.44

d 6 41.08 21.52 1.97
d13 0.84 10.10 27.81
d20 14.65 8.80 2.10
d25 6.32 4.73 7.49
d29 2.24 19.96 25.75
d33 36.36 36.36 36.36

Zoom lens group data group Start focal length
1 1 -38.29
2 7 33.15
3 14-22.85
4 21 27.88
5 26 -56.80
6 30 106.33
7 34 ∞

（数値実施例３）
単位 mm

面データ
面番号 r d nd vd
1* 201.032 3.57 1.73077 40.5
2 27.038 18.68
3 -178.651 2.06 1.73400 51.5
4 155.792 0.17
5 62.603 7.06 1.89286 20.4
6 203.565 1.99
7 117.879 9.25 1.59522 67.7
8* -148.955 9.43
9 291.720 1.59 1.90270 31.0
10 30.366 10.56 1.49700 81.5
11 -156.526 0.35
12 52.574 7.47 1.64850 53.0
13 -61.857 (可変)
14 -160.128 0.99 1.88300 40.8
15 25.707 4.99
16 -49.237 1.14 1.43875 94.9
17 31.343 5.06 1.85478 24.8
18 741.898 (可変)
19(開口絞り) ∞ (可変)
20 -46.003 1.27 1.53775 74.7
21 -80.576 (可変)
22 34.999 6.09 1.59270 35.3
23* 162.682 11.40
24 61.362 1.17 1.95906 17.5
25 32.318 6.25 1.48749 70.2
26 -45.582 (可変)
27 -565.123 4.67 1.95906 17.5
28 -26.967 1.39 1.90270 31.0
29 57.592 4.13
30 66.364 4.64 1.48749 70.2
31 -58.857 0.17
32 46.998 6.16 1.49700 81.5
33 -42.805 1.18 2.00069 25.5
34 2793.827 (可変)
35 ∞ 2.39 1.51633 64.1
36 ∞ 1.00
像面 ∞

非球面データ
第1面
K = 3.00774e+001 A 4= 2.05021e-006 A 6=-7.25063e-010 A 8=-5.54040e-013 A10= 2.01958e-015 A12=-3.58602e-018 A14= 3.05968e-021 A16=-1.05802e-024

第8面
K =-1.28249e-001 A 4= 9.99030e-007 A 6=-4.91783e-010 A 8=-3.88175e-012 A10= 1.26529e-014 A12=-3.32029e-017 A14= 4.83260e-020 A16=-2.94324e-023

第23面
K = 4.03999e+001 A 4= 5.32482e-006 A 6=-9.26453e-010 A 8= 9.19090e-012 A10=-3.97424e-014

各種データ
ズーム比 4.31

焦点距離 17.03 46.18 73.36
Fナンバー 4.12 4.12 4.12
半画角 41.00 17.77 11.41
像高 14.80 14.80 14.80
レンズ全長 261.21 261.21 261.21
BF 58.90 58.90 58.90

d13 1.00 27.33 33.91
d18 35.20 8.87 2.29
d19 15.53 5.15 5.23
d21 7.62 9.68 1.00
d26 10.10 18.41 27.01
d34 56.33 56.33 56.33

ズームレンズ群データ
群 始面 焦点距離
1 1 41.25
2 14 -27.99
3 19 ∞
4 20 -201.96
5 22 45.25
6 27 2000.00
7 35 ∞
(Numerical Example 3)
Unit mm

Surface data surface number rd nd vd
1 * 201.032 3.57 1.73077 40.5
2 27.038 18.68
3 -178.651 2.06 1.73400 51.5
4 155.792 0.17
5 62.603 7.06 1.89286 20.4
6 203.565 1.99
7 117.879 9.25 1.59522 67.7
8 * -148.955 9.43
9 291.720 1.59 1.90270 31.0
10 30.366 10.56 1.49700 81.5
11-156.526 0.35
12 52.574 7.47 1.6485 53.0
13 -61.857 (variable)
14 -160.128 0.99 1.88300 40.8
15 25. 707 4.99
16 -49.237 1.14 1.43875 94.9
17 31.343 5.06 1.85478 24.8
18 741.898 (variable)
19 (aperture stop) ((variable)
20-46.003 1.27 1.53775 74.7
21 -80.576 (variable)
22 34.999 6.09 1.59270 35.3
23 * 162.682 11.40
24 61.362 1.17 1.95906 17.5
25 32.318 6.25 1.48749 70.2
26 -45.582 (variable)
27-565.123 4.67 1.95906 17.5
28-26.967 1.39 1.90270 31.0
29 57.592 4.13
30 66.364 4.64 1.48749 70.2
31-58.857 0.17
32 46.998 6.16 1.49700 81.5
33-42.805 1.18 2.00069 25.5
34 2793.827 (variable)
35 ∞ 2.39 1.51633 64.1
36 1.00
Image plane ∞

Aspheric data first surface
K = 3.00774e + 001 A 4 = 2.05021e-006 A 6 = -7.25063e-010 A 8 =-5.54040e-013 A10 = 2.01958e-015 A12 =-3.58602e-018 A14 = 3.05968e-021 A16 = -1.05802e-024

Eighth side
K = -1.28249e-001 A 4 = 9.99030e-007 A 6 = -4.91783e-010 A 8 = -3.88175e-012 A10 = 1.26529e-014 A12 = -3.32029e-017 A14 = 4.83260e-020 A16 =-2.94324 e-023

23rd
K = 4.03999e + 001 A 4 = 5.32482e-006 A 6 =-9.26453e-010 A 8 = 9.19090e-012 A10 =-3.97424e-014

Various data Zoom ratio 4.31

Focal length 17.03 46.18 73.36
F number 4.12 4.12 4.12
Half angle of view 41.00 17.77 11.41
Image height 14.80 14.80 14.80
Lens total length 261.21 261.21 261.21
BF 58.90 58.90 58.90

d13 1.00 27.33 33.91
d18 35.20 8.87 2.29
d19 15.53 5.15 5.23
d21 7.62 9.68 1.00
d26 10.10 18.41 27.01
d34 56.33 56.33 56.33

Zoom lens group data group Start focal length
1 1 41.25
2 14-27.99
3 19 ∞
4 20 -201.96
5 22 45.25
6 27 2000.00
7 35 ∞

（数値実施例４）
単位 mm

面データ
面番号 r d nd vd
1* 142.107 2.97 1.77250 49.6
2 30.833 19.23
3 -214.418 2.25 1.63854 55.4
4 193.318 0.17
5 61.723 6.53 1.84666 23.8
6 125.558 1.26
7 97.080 5.98 1.58313 59.4
8* -189.724 11.66
9 245.465 1.71 1.80000 29.8
10 35.310 9.71 1.49700 81.5
11 -162.533 0.17
12 65.776 8.03 1.63854 55.4
13 -77.715 (可変)
14 -91.062 0.99 1.83481 42.7
15 28.912 3.84
16 -42.067 1.19 1.49700 81.5
17 30.945 3.61 1.85478 24.8
18 474.495 (可変)
19(開口絞り) ∞ (可変)
20* 34.929 5.84 1.58313 59.4
21* 188.561 7.42
22 62.689 1.29 2.00069 25.5
23 32.976 6.65 1.48749 70.2
24 -41.767 (可変)
25 -110.109 3.39 1.95906 17.5
26 -27.760 1.09 1.85478 24.8
27 110.961 (可変)
28 155.225 3.89 1.48749 70.2
29 -71.770 12.40
30 56.836 6.63 1.49700 81.5
31 -39.229 1.25 1.91082 35.3
32 -795.036 (可変)
33 ∞ 2.39 1.51633 64.1
34 ∞ 1.00
像面 ∞

非球面データ
第1面
K = 9.60256e+000 A 4= 9.02841e-007 A 6= 6.57246e-010 A 8=-2.34864e-012 A10= 3.36885e-015 A12=-2.34122e-018 A14= 6.42583e-022 A16=-2.10451e-026

第8面
K =-7.19297e+001 A 4=-4.48892e-007 A 6= 1.30222e-009 A 8=-2.14328e-012 A10= 1.12728e-015 A12= 6.02779e-019 A14=-6.86578e-022 A16=-3.24205e-025

第20面
K = 3.22915e+000 A 4=-7.43684e-006 A 6=-1.64141e-008 A 8=-4.87770e-011 A10=-4.23427e-014 A12=-2.24623e-016 A14=-3.93621e-018 A16= 6.48189e-021

第21面
K = 1.62572e+002 A 4= 6.39763e-006 A 6= 5.31874e-010 A 8=-4.54040e-011 A10= 1.44685e-013 A12=-5.92999e-016 A14= 5.71689e-019 A16=-1.89487e-020

各種データ
ズーム比 5.49

焦点距離 18.54 56.09 101.76
Fナンバー 4.12 4.12 4.12
半画角 38.60 14.78 8.28
像高 14.80 14.80 14.80
レンズ全長 256.18 256.18 256.18
BF 42.19 42.19 42.19

d13 1.00 28.34 35.17
d18 36.53 9.19 2.36
d19 24.21 16.90 2.97
d24 2.79 15.03 25.59
d27 20.31 15.37 18.74
d32 39.61 39.61 39.61

ズームレンズ群データ
群 始面 焦点距離
1 1 48.32
2 14 -24.83
3 19 ∞
4 20 43.10
5 25 -78.50
6 28 99.75
7 33 ∞
Numerical Embodiment 4
Unit mm

Surface data surface number rd nd vd
1 * 142.107 2.97 1.77250 49.6
2 30.833 19.23
3-214.418 2.25 1.63854 55.4
4 193.318 0.17
5 61.723 6.53 1.84666 23.8
6 125.558 1.26
7 97.080 5.98 1.58313 59.4
8 * -189.724 11.66
9 245.465 1.71 1.80000 29.8
10 35.310 9.71 1.49700 81.5
11 -162.533 0.17
12 65.776 8.03 1.63854 55.4
13 -77.715 (variable)
14 -91.062 0.99 1.83481 42.7
15 28.912 3.84
16-42.067 1.19 1.49700 81.5
17 30.945 3.61 1.85478 24.8
18 474.495 (variable)
19 (aperture stop) ((variable)
20 * 34.929 5.84 1.58313 59.4
21 * 188.561 7.42
22 62.689 1.29 2.00069 25.5
23 32.976 6.65 1.48749 70.2
24-41.767 (variable)
25 -110.109 3.39 1.95906 17.5
26-27.760 1.09 1.85478 24.8
27 110.961 (variable)
28 155.225 3.89 1.48749 70.2
29 -71.770 12.40
30 56.836 6.63 1.49700 81.5
31-39.229 1.25 1.91082 35.3
32 -795.036 (variable)
33 ∞ 2.39 1.51633 64.1
34 1.00
Image plane ∞

Aspheric data first surface
K = 9.60256e + 000 A 4 = 9.02841e-007 A 6 = 6.57246e-010 A 8 = -2.34864e-012 A10 = 3.36885e-015 A12 = -2.34122e-018 A14 = 6.42583e-022 A16 =- 2.10451e-026

Eighth side
K = -7.129297e + 001 A4 = -4.4882e-007A 6 = 1.30222e-009 A 8 = -2.14328e-012 A10 = 1.12728e-015 A12 = 6.02779e-019 A14 = -6.86578e-022 A16 =-3.24205e-025

Face 20
K = 3.22915e + 000 A 4 = -7.43684e-006 A 6 =-1.64141e-008 A 8 =-4.87 770e-01 1 A 10 =-4. 2 3427e-0 14 A 12 =-2.24623e-016 A 14 =-3.93621e- 018 A16 = 6.48189e-021

21st
K = 1.62572e + 002 A 4 = 6.39763e-006 A 6 = 5.31874e-010 A 8 = -4.54040e-011 A10 = 1.44685e-013 A12 = -5.92999e-016 A14 = 5.71689e-019 A16 =- 1.89487e-020

Various data zoom ratio 5.49

Focal length 18.54 56.09 101.76
F number 4.12 4.12 4.12
Half angle of view 38.60 14.78 8.28
Image height 14.80 14.80 14.80
Lens total length 256.18 256.18 256.18
BF 42.19 42.19 42.19

d13 1.00 28.34 35.17
d18 36.53 9.19 2.36
d19 24.21 16.90 2.97
d24 2.79 15.03 25.59
d27 20.31 15.37 18.74
d32 39.61 39.61 39.61

Zoom lens group data group Start focal length
1 1 48.32
2 14-24.83
3 19 ∞
4 20 43.10
5 25 -78.50
6 28 99.75
7 33 ∞

前述の各条件式と数値実施例における諸数値との関係を表１に示す。

Figure 0006549966
The relationship between each of the conditional expressions described above and the numerical values in the numerical example is shown in Table 1.

Figure 0006549966

以上説明した様に、各実施例によれば、小型且つ軽量で、Ｆ値が明るい広角ズームレンズを実現する事ができる。   As described above, according to each embodiment, it is possible to realize a wide-angle zoom lens that is compact and lightweight, and has a bright F value.

次に本発明のズームレンズを撮影光学系として用いたカメラの実施形態について図１７を用いて説明する。   Next, an embodiment of a camera using the zoom lens according to the present invention as a photographing optical system will be described with reference to FIG.

図１７は各実施例のズームレンズを撮影光学系として用いた撮像装置（テレビカメラシステム）の概略図である。図１７において１０１は実施例１〜６のいずれかのズームレンズである。１２４はカメラである。ズームレンズ１０１はカメラ１２４に対して着脱可能となっている。１２５はカメラ１２４にズームレンズ１０１を装着することで構成される撮像装置である。ズームレンズ１０１は第１レンズ群Ｆ、変倍部ＬＺ、結像用のレンズ群Ｒを有している。第１レンズ群Ｆは合焦用レンズ群が含まれている。ＳＰは開口絞りである。１１４、１１５は各々第１レンズ群Ｆ、変倍部ＬＺを光軸方向に駆動するヘリコイドやカム等の駆動機構である。１１６〜１１８は駆動機構１１４、１１５および開口絞りＳＰを電動駆動するモータ（駆動手段）である。１１９〜１２１は、第１レンズ群Ｆや変倍部ＬＺの光軸上の位置や、開口絞りＳＰの絞り径を検出するためのエンコーダやポテンショメータ、あるいはフォトセンサ等の検出器である。なお、レンズ群Ｒ内に移動群を有するズームレンズの場合は、１１４〜１２１同様の構成がレンズ群Ｒにも付加される。カメラ１２４において、１０９はカメラ１２４内の光学フィルターや色分解光学系に相当するガラスブロック、１１０はズームレンズ１０１によって形成された被写体像を受光するＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）である。また、１１１、１２２はカメラ１２４及びズームレンズ１０１の各種の駆動を制御するＣＰＵである。   FIG. 17 is a schematic view of an image pickup apparatus (television camera system) using the zoom lens of each embodiment as a photographing optical system. In FIG. 17, reference numeral 101 denotes the zoom lens according to any one of the first to sixth embodiments. 124 is a camera. The zoom lens 101 is attachable to and detachable from the camera 124. An imaging apparatus 125 is configured by mounting the zoom lens 101 on the camera 124. The zoom lens 101 has a first lens unit F, a variable power unit LZ, and a lens unit R for image formation. The first lens unit F includes a focusing lens unit. SP is an aperture stop. Denoted at 114 and 115 are driving mechanisms such as a helicoid and a cam for driving the first lens unit F and the zoom unit LZ in the optical axis direction. Reference numerals 116 to 118 denote motors (driving means) for electrically driving the drive mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 denote detectors such as an encoder, a potentiometer, or a photo sensor for detecting the position on the optical axis of the first lens unit F or the zoom unit LZ, and the diameter of the aperture stop SP. In the case of a zoom lens having a moving group in the lens group R, the same configuration as that in the lens group 114 is added to the lens group R. In the camera 124, 109 is a glass block corresponding to an optical filter or color separation optical system in the camera 124, 110 is a solid-state imaging device (photoelectric conversion such as a CCD sensor or CMOS sensor that receives the object image formed by the zoom lens 101) Element). Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens 101.

なお、撮像素子にＣＣＤ等の電子撮像素子を用いれば、電子的に収差補正をする事で出力画像を更に高画質化する事ができる。   If an electronic imaging device such as a CCD is used as the imaging device, the output image can be further enhanced in image quality by performing aberration correction electronically.

以上、本発明の好ましい実施形態について説明したが、本発明はこれらの実施形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。   As mentioned above, although the preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

Ｌ１ 第１レンズ群（前レンズ群）
Ｌ２ 第２レンズ群（第１，３，４実施例：ＮＦレンズ群、第２実施例：前レンズ群）
Ｌ３ 第３レンズ群（第１，３，４実施例：第１の後レンズ群、第２実施例：Ｎｆレンズ群）
Ｌ４ 第４レンズ群（第１，３，４実施例：第２の後レンズ群、第２実施例：第１の後レンズ群）
Ｌ５ 第５レンズ群（第１，３，４実施例：第３の後レンズ群、第２実施例：第２の後レンズ群）
Ｌ６ 第６レンズ群（第２実施例：第３の後レンズ群）
ＳＰ 開口絞り L1 First lens group (front lens group)
L2 Second lens group (first, third, fourth embodiments: NF lens group, second embodiment: front lens group)
L3 Third lens group (first, third, fourth embodiments: first rear lens group, second embodiment: Nf lens group)
L4 Fourth lens group (first, second, third embodiments: second rear lens group, second embodiment: first rear lens group)
L5 fifth lens group (first, third, fourth embodiments: third rear lens group, second embodiment: second rear lens group)
L6 Sixth lens group (second embodiment: third rear lens group)
SP aperture stop

Claims (7)

物体側より像側へ順に、最も物体側に配置されたズーミングのためには移動しない第１のレンズ群からなる、または最も物体側に配置されたズーミングのためには移動しない第１のサブレンズ群を含む２つ以上のサブレンズ群からなる前レンズ群と、３つ以上のレンズを含み、サブレンズ群を含まず、負の屈折力を有する中レンズ群と、開口絞りと、サブレンズ群を含まず、ズーミングのために移動する第１の後レンズ群と、サブレンズ群を含まず、ズーミングのために移動する第２の後レンズ群と、サブレンズ群を含まず、ズーミングのためには移動しない第３の後レンズ群と、からなるズームレンズであって、
前記前レンズ群と、前記中レンズ群と、前記第１の後レンズ群と、前記第２の後レンズ群と、前記第３の後レンズ群とは、隣り合うレンズ群とレンズ群との間隔がいずれもズーミングのために変化し、かつ前記前レンズ群が２つ以上のサブレンズ群からなる場合は、さらに、隣り合うサブレンズ群とサブレンズ群との間隔、および隣り合うサブレンズ群とレンズ群との間隔がいずれもズーミングのために変化し、
前記前レンズ群は、最も物体側に負レンズが配置され、４つ以上のレンズからなり、且つ正の屈折力を有する１つ以上の前記前レンズ群を構成する前記第１のレンズ群の部分またはサブレンズ群を含み、前記前レンズ群を構成する前記第１のレンズ群または前記第１のサブレンズ群のうちの一部がフォーカシングのために移動し、
広角端での前記第１の後レンズ群の光軸方向の位置と望遠端での前記第１の後レンズ群の光軸方向の位置との差をＭｒ１とし、広角端での前記第２の後レンズ群の光軸方向の位置と望遠端での前記第２の後レンズ群の光軸方向の位置との差をＭｒ２とし、前記第２の後レンズ群の焦点距離をｆｒ２とし、広角端での前記ズームレンズの焦点距離をｆｗとし、Ｍｒ１は、前記第１の後レンズ群が望遠端で広角端でより像側に位置する場合に、正の符号をとるものとし、Ｍｒ２は、前記第２の後レンズ群が望遠端で広角端でより像側に位置する場合に、正の符号をとるものとして、
−０．８０＜Ｍｒ２／ｆｒ２＜０．４５
−２．０＜Ｍｒ２／ｆｗ＜０．３
−１５．０＜Ｍｒ１／Ｍｒ２＜２．０
なる条件式を満足することを特徴とするズームレンズ。 A first sub-lens consisting of a first lens group which does not move for zooming arranged closest to the object side from an object side to an image side , or a first sub-lens which does not move for zooming arranged closest to the object side a front lens group including two or more sub-lens group including the group comprises three or more lenses, not including sub-lens group, a lens group in having a negative refractive power, an aperture stop, a group sub-lens Not including the first rear lens group moving for zooming and the sub lens group not including the second rear lens group moving for zooming and the sub lens group not for zooming a third lens group after the zoom lens made which does not move,
A space between a lens group and a lens group adjacent to the front lens group, the middle lens group, the first rear lens group, the second rear lens group, and the third rear lens group In addition, when the front lens group consists of two or more sub lens groups in any case, the distance between the adjacent sub lens group and the sub lens group, and the adjacent sub lens group The distance to the lens group changes for zooming,
The front lens group is disposed a negative lens closest to the object side, consists of four or more lens, and a positive one or a portion of the first lens group constituting the front lens group having a refractive power of Or a part of the first lens group constituting the front lens group or the first sub lens group including the sub lens group is moved for focusing;
The difference between the position in the optical axis direction of the first rear lens group at said position and the telephoto end of the optical axis of the first rear lens group at the wide angle end and Mr1, at the wide angle end and the second the difference between the optical axis direction position of the second rear lens group at position and the telephoto end in the optical axis direction of the rear lens group and Mr2, the focal length of the second rear lens group and fr2, the wide-angle end the focal length of the zoom lens and fw in, Mr1, the first after lens group when located more image side at the wide-angle end at the telephoto end, it is assumed that a positive sign, Mr2, the In the case where the second rear lens unit is positioned more on the image side at the wide angle end at the telephoto end ,
−0.80 <Mr2 / fr2 <0.45
−2.0 <Mr2 / fw <0.3
-15.0 <Mr1 / Mr2 <2.0
A zoom lens characterized by satisfying the following conditional expression . 前記第１の後レンズ群の焦点距離をｆｒ１として、
１．０＜｜ｆｒ１｜／ｆｗ＜１５．０
なる条件式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。 As a fr1 the focal length of the first rear lens group,
1.0 <| fr1 | / fw <15.0
The zoom lens according to claim 1, which satisfies the following conditional expression . １．０＜｜ｆｒ２｜／ｆｗ＜５．５
なる条件式を満足することを特徴とする請求項１または請求項２に記載のズームレンズ。 1.0 <| fr2 | / fw <5.5
Claim 1 or the zoom lens according to claim 2, characterized by satisfying the conditional expression. 前記第１の後レンズ群と前記第２の後レンズ群とのうち少なくとも一方は、正の屈折力を有し、望遠端で広角端でより物体側に位置することを特徴とする請求項１ないし請求項３のうちいずれか１項に記載のズームレンズ。 Claim wherein the at least one of the first rear lens the second rear lens group and group, which has a positive refractive power, characterized that you located more object side at the wide-angle end at the telephoto end 1 or zoom lens according to any one of claims 3. 前記開口絞りは、ズーミングのためには移動しないことを特徴とする請求項１ないし請求項４のうちいずれか１項に記載のズームレンズ。 The aperture stop, the zoom lens according to any one of claims 1 to 4, characterized in that does not move for zooming. 前記第１の後レンズ群の焦点距離をｆｒ１として、
０．４４＜｜ｆｒ１／ｆｒ２｜＜４．９１
なる条件式を満足することを特徴とする請求項１ないし請求項５のうちいずれか１項に記載のズームレンズ。 As a fr1 the focal length of the first rear lens group,
0.44 <| fr1 / fr2 | <4.91
The zoom lens according to any one of claims 1 to 5, characterized by satisfying the conditional expression. 請求項１ないし請求項６のうちいずれか１項に記載のズームレンズと、
前記ズームレンズの像面に配された撮像素子と、
を有することを特徴とする撮像装置。 A zoom lens according to any one of claims 1 to 6,
An imaging element disposed on an image plane of the zoom lens;
An imaging apparatus characterized by having:
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