JP6289533B2 - Zoom lens and image pickup apparatus including the same - Google Patents

Zoom lens and image pickup apparatus including the same Download PDF

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JP6289533B2
JP6289533B2 JP2016092728A JP2016092728A JP6289533B2 JP 6289533 B2 JP6289533 B2 JP 6289533B2 JP 2016092728 A JP2016092728 A JP 2016092728A JP 2016092728 A JP2016092728 A JP 2016092728A JP 6289533 B2 JP6289533 B2 JP 6289533B2
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lens
lens group
refractive power
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zoom lens
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JP2016157143A (en
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岩澤　嘉人
嘉人 岩澤
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Tamron Co Ltd
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Description

本発明は、ズームレンズ及びそれを備えた撮像装置、さらに詳しくは、高倍率・小型軽量で高速な合焦が可能なズームレンズ及びそれを備えた撮像装置に関する。   The present invention relates to a zoom lens and an image pickup apparatus including the same, and more particularly to a zoom lens capable of focusing at high magnification, a small size, and a light weight at high speed, and an image pickup apparatus including the same.

近年、デジタルスチルカメラ等の固体撮像素子を用いた撮像装置が普及している。それに伴い、光学系の高性能化、小型化が進み、小型の撮像装置システムが急速に普及してきている。
光学系の高性能化に伴い、より高い結像性能を有する光学系が要望される共に、より高倍率化の要望も強く、特に変倍比が１０倍を超えるような高倍率光学系の要望が強い。その上、小型化の要望も強く、光軸方向の小型化だけではなく、鏡筒径方向の小型化の要望も強く、これらの要望を同時に満たす光学系が求められている。 In recent years, imaging devices using solid-state imaging devices such as digital still cameras have become widespread. Along with this, the performance and miniaturization of optical systems have progressed, and compact imaging device systems have been rapidly spreading.
Along with the higher performance of optical systems, there is a demand for optical systems with higher imaging performance, and there is also a strong demand for higher magnification, especially for high-magnification optical systems with a zoom ratio exceeding 10 times. Is strong. In addition, there is a strong demand for miniaturization, and there is a strong demand not only for miniaturization in the optical axis direction but also for miniaturization in the lens barrel radial direction, and an optical system that simultaneously satisfies these demands is required.

従来のズームレンズで、高い結像性能、高倍率、そして小型化をある程度満たしているものとして、広角端が７０°を越えて変倍比が１０倍程度を越えても、十分な結像性能を維持し、適切なフォーカス作動が可能な小型のズームレンズであって、正屈折力の第１レンズ群Ｇ１、負屈折力の第２レンズ群Ｇ２、正屈折力の第３レンズ群Ｇ３、負屈折力の第４レンズ群Ｇ４、及び、正屈折力の第５レンズ群Ｇ５で構成され、広角端から望遠端への変倍時に、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間隔、及び、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間隔が大きくなり、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間隔、及び、第４レンズ群Ｇ４と第５レンズ群Ｇ５の間隔が小さくなり、第３レンズ群Ｇ３又はそのレンズ群内の一部のレンズ群を移動することによって有限遠物体にフォーカスするズームレンズが提案されている（例えば、特許文献１参照）。   With a conventional zoom lens that satisfies high imaging performance, high magnification, and downsizing to some extent, sufficient imaging performance even when the wide-angle end exceeds 70 ° and the zoom ratio exceeds about 10 times. Is a small zoom lens capable of proper focusing operation, and includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a negative The fourth lens group G4 having a refractive power and the fifth lens group G5 having a positive refractive power, and at the time of zooming from the wide angle end to the telephoto end, The distance between the third lens group G3 and the fourth lens group G4 increases, the distance between the second lens group G2 and the third lens group G3, and the distance between the fourth lens group G4 and the fifth lens group G5 decreases. The third lens group G3 or a part of the lens group in the lens group is moved. Zoom lens to focus on a finite distant object it has been proposed by (e.g., see Patent Document 1).

上述した要望をある程度満たす他のズームレンズとして、変倍比７倍〜１０倍程度、Ｆナンバー２．５〜４程度、最先端の小さな画素ピッチの撮像素子用の光学系として使用できる高い性能を持ち、コンパクト性に優れた高変倍ズームレンズ系であって、物体側より順に、正パワーの第１レンズ群(Gr1)、負パワーの第２レンズ群(Gr2)、正パワーの第３レンズ群(Gr3)、負パワーの第４レンズ群(Gr4)を含み、
条件式：1.1＜f1／fT＜2.5
{f1:第１レンズ群(Gr1)の焦点距離, fT:望遠端(T)での全系の焦点距離}
を満足する撮像レンズが提案されている（例えば、特許文献２参照）。 As another zoom lens that satisfies the above-mentioned requirements to some extent, it has a high performance that can be used as an optical system for an image sensor with a zoom ratio of about 7 to 10 times, an F number of about 2.5 to 4, and a state-of-the-art small pixel pitch. This is a high-magnification zoom lens system that is compact and has excellent compactness. In order from the object side, the first lens group (Gr1) with positive power, the second lens group (Gr2) with negative power, and the third lens with positive power Group (Gr3), negative power fourth lens group (Gr4),
Conditional expression: 1.1 <f1 / fT <2.5
{f1: Focal length of the first lens group (Gr1), fT: Focal length of the entire system at the telephoto end (T)}
An imaging lens that satisfies the above has been proposed (for example, see Patent Document 2).

上述した要望をある程度満たすさらに他のズームレンズとして、ビデオカメラ、デジタルスチルカメラ、レンズ一体型カメラ等に用いられるコンパクトで、高速ＡＦに最適で高い結像性能を有するズームレンズ系であって、物体側より順に、正の第１レンズ群、負の第２レンズ群、正の第３レンズ群、負の第４レンズ群、正の第５レンズ群、負の第６レンズ群とを含み、上記レンズ群の間隔を変化させて変倍を行い、無限遠撮影時の広角端における第ｉレンズ群と第ｊレンズ群との間の群間隔をＤW(i-j) 、無限遠撮影時の望遠端における第ｉレンズ群と第ｊレンズ群との間の群間隔ＤT(i-j) としたとき、
条件式（１）ＤW(1-2) ＜ＤT(1-2)
（２）ＤW(2-3) ＞ＤT(2-3)
（３）ＤW(3-4) ＞ＤT(3-4)
（４）ＤW(4-5) ＜ＤT(4-5)
（５）ＤW(5-6) ＜ＤT(5-6)
を満足しかつ、上記第４レンズ群が光軸方向に移動することによってフォーカシングが行われるズームレンズ系が提案されている（例えば、特許文献３参照）。 As another zoom lens that satisfies the above-mentioned requirements to some extent, it is a compact zoom lens system that is used for video cameras, digital still cameras, lens-integrated cameras, etc. The positive first lens group, the negative second lens group, the positive third lens group, the negative fourth lens group, the positive fifth lens group, and the negative sixth lens group in order from the side, The magnification is changed by changing the distance between the lens groups, and the group distance between the i-th lens group and the j-th lens group at the wide-angle end at the time of infinity shooting is DW (ij), and at the telephoto end at the time of infinity shooting. When the group distance DT (ij) between the i-th lens group and the j-th lens group is set,
Conditional expression (1) DW (1-2) <DT (1-2)
(2) DW (2-3)> DT (2-3)
(3) DW (3-4)> DT (3-4)
(4) DW (4-5) <DT (4-5)
(5) DW (5-6) <DT (5-6)
And a zoom lens system in which focusing is performed by moving the fourth lens group in the optical axis direction has been proposed (for example, see Patent Document 3).

特開２００１−０９１８３３号公報JP 2001-091833 A 特開２００１−３５００９３号公報JP 2001-350093 A 特開２００６−２５１４６２号公報JP 2006-251462 A

上述した従来のズームレンズにおいては、ズーム全域で高い結像性能を達成するため、ズーミングのために移動するレンズ群の数を増やすことによって、収差補正の自由度を増大させている。しかし、特許文献１により提案されたズームレンズ系は、１０倍程度の変倍比を有しているが、小型化が十分ではない。
また、特許文献２及び特許文献３によって提案されているズームレンズにおいては、可動群を増やすことで高い結像性能を有しているが、小型化が不十分である。 In the conventional zoom lens described above, in order to achieve high imaging performance over the entire zoom range, the degree of freedom of aberration correction is increased by increasing the number of lens groups that move for zooming. However, the zoom lens system proposed by Patent Document 1 has a zoom ratio of about 10 times, but the size reduction is not sufficient.
In addition, the zoom lenses proposed in Patent Document 2 and Patent Document 3 have high imaging performance by increasing the movable group, but the size reduction is insufficient.

（発明の目的）
本発明は、従来のズームレンズの上述した問題点に鑑みてなされたものであって、収差補正の自由度が増大しており、小型化も十分なされたズームレンズ及びそれを備えた撮像装置を提供することを目的とする。 (Object of invention)
The present invention has been made in view of the above-mentioned problems of the conventional zoom lens, and has a zoom lens with an increased degree of freedom of aberration correction and a sufficient size reduction, and an image pickup apparatus including the zoom lens. The purpose is to provide.

（第１発明）
物体側から順に、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、第４レンズ群と、負の屈折力を有する第５レンズ群とを有し、
変倍時に隣り合うレンズ群の間隔が変化し、前記第１レンズ群は物体側から順に負レンズ、正レンズ、及び正レンズから構成され、前記第５レンズ群は最も物体側に負レンズを有し、以下の条件を満足するズームレンズ。
2.0 < βｒｔ < 3.5 ・・・・・・・・(1)
但し、
βｒｔ： 第３レンズ群より像側に位置するレンズ群の望遠端に於ける合成横倍率 (First invention)
In order from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group, and negative refraction A fifth lens group having power,
The distance between adjacent lens groups changes during zooming, the first lens group is composed of a negative lens, a positive lens, and a positive lens in order from the object side, and the fifth lens group has a negative lens on the most object side. Zoom lens that satisfies the following conditions.
2.0 <βrt <3.5 (1)
However,
βrt: Composite lateral magnification at the telephoto end of the lens unit located on the image side from the third lens unit

第１発明においては、特に、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、第４レンズ群と、負の屈折力を有する第５レンズ群とを有し、ズーム作動において５つ以上のレンズ群間隔及びレンズ群結像間隔を変化させることが好ましい。   In the first invention, in particular, 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, a fourth lens group, It is preferable to have a fifth lens group having a negative refractive power, and to change the interval between five or more lens groups and the lens group imaging interval in zoom operation.

（第１発明の効果）
第１発明のズームレンズによれば、収差補正の自由度が増大しており、小型化も十分なされたズームレンズを構成できる。
特に、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、第４レンズ群と、負の屈折力を有する第５レンズ群とを有し、ズーム作動において５つ以上のレンズ群間隔及びレンズ群結像間隔を変化させることにより、収差補正の自由度を高める効果を得ることができる。加えて、第１発明のズームレンズによれば変倍比を大きくすることもできる。 (Effect of the first invention)
According to the zoom lens of the first aspect of the present invention, it is possible to configure a zoom lens in which the degree of freedom of aberration correction is increased and the size is sufficiently reduced.
In particular, the first lens group having a positive refractive power, the second lens group having a negative refractive power, the third lens group having a positive refractive power, and the fourth lens group have a negative refractive power. By having a fifth lens group and changing the interval between five or more lens groups and the lens group imaging interval in zoom operation, an effect of increasing the degree of freedom of aberration correction can be obtained. In addition, according to the zoom lens of the first invention, the zoom ratio can be increased.

（第２発明）
第１発明のズームレンズの像側に、前記ズームレンズによって形成された光学像を電気的信号に変換する撮像素子を備えたことを特徴とする撮像装置。 (Second invention)
An image pickup apparatus comprising an image pickup device for converting an optical image formed by the zoom lens into an electrical signal on an image side of the zoom lens according to the first aspect of the invention.

（第２発明の効果）
第２発明の撮像装置によれば、上述した第１発明及び第２発明のズームレンズの特性を有効に利用して、小型軽量で高速合焦可能なズームレンズ及びそれを備えた撮像装置を構成できる効果を得ることができる。 (Effect of the second invention)
According to the image pickup apparatus of the second aspect of the present invention, a small and light zoom lens capable of focusing at high speed and an image pickup apparatus including the same are configured by effectively utilizing the characteristics of the zoom lenses of the first and second aspects of the invention described above. The effect which can be obtained can be acquired.

（発明の第１実施態様）
第１発明において、前記ズームレンズが以下の条件式を満足することを特徴とする。
-0.8 < ｆｒｔ/ｆｔ < -0.3 ・・・・・・・・(2)
但し、
ｆｒｔ： 第３レンズ群より像側に位置するレンズ群の望遠端に於ける合成焦点距離
ｆｔ ： 望遠端に於ける前記ズームレンズの焦点距離 (First embodiment of the invention)
In the first invention, the zoom lens satisfies the following conditional expression.
-0.8 <frt / ft <-0.3 (2)
However,
frt: Composite focal length at the telephoto end of the lens unit located on the image side of the third lens unit ft: Focal length of the zoom lens at the telephoto end

（発明の第２実施態様）
第１発明において、前記第２レンズ群が以下の条件式を満足することを特徴とする。
3.5 < β2t/β2w < 8.0 ・・・・・・・・・(3)
但し、
β2ｔ： 第2レンズ群の望遠端に於ける横倍率
β2w ： 第2レンズ群の広角端に於ける横倍率 (Second Embodiment of the Invention)
In the first invention, the second lens group satisfies the following conditional expression.
3.5 <β2t / β2w <8.0 (3)
However,
β2t: Lateral magnification at the telephoto end of the second lens group β2w: Lateral magnification at the wide-angle end of the second lens group

（発明の第３実施態様）
第１発明において、広角端状態から望遠端状態へ変倍する際に、前記第１レンズ群が、広角端状態より望遠端状態で、物体側に位置することを特徴とする。 (Third embodiment of the invention)
In the first invention, when zooming from the wide-angle end state to the telephoto end state, the first lens group is positioned closer to the object side in the telephoto end state than in the wide-angle end state.

（発明の第４実施態様）
第１発明において、前記第４レンズ群が、負の屈折力を有することを特徴とする。 (Fourth embodiment of the invention)
In the first invention, the fourth lens group has a negative refractive power.

（発明の第５実施態様）
第１発明において、前記第４レンズ群を像側に移動することで、無限遠から近接物体への合焦を行うことを特徴とする。 (Fifth embodiment of the invention)
In the first invention, the fourth lens group is moved to the image side to perform focusing from infinity to a close object.

（発明の第６実施態様）
第１発明において、前記第３レンズ群より像側に配置されたレンズ群が、以下の条件式を満足することを特徴とする。
2.2 < ｆｒw/ｆ2 < 3.4 ・・・・・・・・・(4)
但し、
ｆｒw： 第３レンズ群より像側に位置するレンズ群の広角端に於ける合成焦点距離
ｆ2 ： 前記第2レンズ群の焦点距離 (Sixth embodiment of the invention)
In the first invention, the lens group disposed on the image side of the third lens group satisfies the following conditional expression.
2.2 <frw / f2 <3.4 (4)
However,
frw: Composite focal length f2 at the wide-angle end of the lens unit located on the image side from the third lens unit f2: Focal length of the second lens unit

（発明の第７実施態様）
第１発明において、前記第５レンズ群の像側に、正の屈折力を有する第６レンズ群を配置したことを特徴とする。 (Seventh embodiment of the invention)
The first invention is characterized in that a sixth lens group having a positive refractive power is disposed on the image side of the fifth lens group.

（条件式(1)の説明）
条件式(1)を満足することで、望遠端において適切なレンズバックすなわちバックフォーカスを確保することができる。
条件式(1)の下限を割ると、レンズ系における像側に配置されたレンズ群の横倍率が小さくなるため、径方向の小型化が不十分となる。
条件式(1)の上限を超えると、レンズ系における像側に配置されたレンズ群での拡大率が大きくなり過ぎて、収差補正のために多くのレンズ枚数が必要となり、小型化の妨げとなる。 (Explanation of conditional expression (1))
By satisfying conditional expression (1), it is possible to secure an appropriate lens back, that is, back focus, at the telephoto end.
When the lower limit of conditional expression (1) is divided, the lateral magnification of the lens group arranged on the image side in the lens system becomes small, and thus the size reduction in the radial direction becomes insufficient.
If the upper limit of conditional expression (1) is exceeded, the enlargement ratio at the lens group arranged on the image side in the lens system becomes too large, and a large number of lenses are required for aberration correction, which hinders downsizing. Become.

（条件式(2)の説明）
条件式(2)の下限を割ると、レンズ系における像側に配置されたレンズ群の合成焦点距離が大きくなるため、テレフォトが弱くなり、望遠端状態での光学全長が大きくなってしまう。
条件式(2)の上限を超えると、レンズ系における像側に配置されたレンズ群での合成焦点距離が小さくなり過ぎて、テレフォトが強くなり過ぎる。その結果、収差補正のために多くのレンズ枚数が必要となり、小型化の妨げとなる。 (Explanation of conditional expression (2))
If the lower limit of conditional expression (2) is divided, the combined focal length of the lens group arranged on the image side in the lens system increases, so that the telephoto becomes weak and the total optical length in the telephoto end state increases.
When the upper limit of conditional expression (2) is exceeded, the combined focal length at the lens group disposed on the image side in the lens system becomes too small and telephoto becomes too strong. As a result, a large number of lenses are required for aberration correction, which hinders downsizing.

第１発明の第１実施態様の効果を、上述した特許文献の発明と比較する。望遠端での望遠比すなわち焦点距離に対する光学全長の比は、本件第１発明の第１実施形態が1.12、特許文献１の実施形態２が1.87、特許文献２の実施形態４が2.36、特許文献３の実施形態６が1.24である。
これによって、本件第１発明の第１実施態様が望遠端での光学全長の小型化に効果があることが分かる。 The effect of the first embodiment of the first invention will be compared with the invention of the above-mentioned patent document. The telephoto ratio at the telephoto end, that is, the ratio of the optical total length to the focal length, is 1.12 in the first embodiment of the first invention, 1.87 in the second embodiment of Patent Document 1, 2.36 in the fourth embodiment of Patent Document 2, and Patent Document Embodiment 6 of 3 is 1.24.
Thus, it can be seen that the first embodiment of the first invention of the present invention is effective in reducing the optical total length at the telephoto end.

（条件式(3)の説明）
条件式(3)の下限を割ると、前記第２レンズ群の変倍寄与率が小さくなり、前記ズームレンズ全体の高変倍化の達成が困難となる。
条件式(3)の上限を超えると、前記第２レンズ群の変倍作用が大きくなり過ぎ、レンズ枚数の増加が避けられなくなり、小型化の妨げとなる。 (Explanation of conditional expression (3))
If the lower limit of conditional expression (3) is divided, the zooming contribution ratio of the second lens group becomes small, and it becomes difficult to achieve high zooming of the entire zoom lens.
If the upper limit of conditional expression (3) is exceeded, the zooming action of the second lens group becomes too large, and an increase in the number of lenses is unavoidable, which hinders downsizing.

（条件式(4)の説明）
第３レンズ群より像側に位置するレンズ群の広角端に於ける合成焦点距離と前記第２レンズ群の焦点距離比を適切にすることで、広角端での歪曲収差補正が容易となる。第２レンズ群のパワーが強くなると、第２レンズ群での負の歪曲発生量が大きくなる。そこで、レンズ系像面側に位置するレンズ群で、正の歪曲を発生させて歪曲補正を容易となるようなパワー配置が望ましい。 (Explanation of conditional expression (4))
By appropriately adjusting the combined focal length at the wide-angle end of the lens group located on the image side from the third lens group and the focal length ratio of the second lens group, it becomes easy to correct distortion at the wide-angle end. As the power of the second lens group increases, the amount of negative distortion generated in the second lens group increases. Therefore, it is desirable to have a power arrangement that facilitates distortion correction by generating positive distortion in the lens group located on the lens system image plane side.

条件式(4)の下限を割ると、すなわちレンズ系像面側に位置するレンズ群のパワーが強くなり過ぎる場合には、像面湾曲の補正が困難となる。
条件式(4)の上限を超える場合、すなわちレンズ系像面側に位置するレンズ群のパワーが弱い場合には、レンズ系像面側に位置するレンズ群による正の歪曲発生量が小さくなり、レンズ系の歪曲収差補正の妨げとなる。 When the lower limit of conditional expression (4) is divided, that is, when the power of the lens unit located on the lens system image plane side becomes too strong, it is difficult to correct field curvature.
When the upper limit of conditional expression (4) is exceeded, that is, when the power of the lens group located on the lens system image plane side is weak, the amount of positive distortion generated by the lens group located on the lens system image plane side becomes small, This hinders correction of distortion in the lens system.

本願の第１実施形態のズームレンズの広角端での光学断面図である。It is an optical sectional view at the wide-angle end of the zoom lens according to the first embodiment of the present application. 本願の第１実施形態のズームレンズの広角端状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差の収差図である。球面収差図において、破線はg線(435.8nm)を示し、一点鎖線はC線(656.3nm)を示す。非点収差図において、実線はサジタル像面を示し、破線はメリジオナル像面を示す。以下の収差図においても同じである。FIG. 3 is a spherical aberration diagram, an astigmatism diagram, and an aberration diagram of distortion aberration when the zoom lens according to the first embodiment of the present application is focused at infinity in the wide-angle end state. In the spherical aberration diagram, the broken line indicates the g line (435.8 nm), and the alternate long and short dash line indicates the C line (656.3 nm). In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. The same applies to the following aberration diagrams. 本願の第１実施形態のズームレンズの中間焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。FIG. 4 is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when the zoom lens of the first embodiment of the present application is focused at infinity in the intermediate focal length state. 本願の第１実施形態のズームレンズの望遠焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。FIG. 3 is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when the zoom lens according to the first embodiment of the present application is focused at infinity in the telephoto focal length state. 本願の第２実施形態のズームレンズの広角端での光学断面図である。It is an optical sectional view at the wide-angle end of a zoom lens according to a second embodiment of the present application. 本願の第２実施形態のズームレンズの広角端状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。FIG. 10 is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when the zoom lens according to the second embodiment of the present application is focused at infinity in the wide-angle end state. 本願の第２実施形態のズームレンズの中間焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。FIG. 10 is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when the zoom lens of the second embodiment of the present application is focused at infinity in the intermediate focal length state. 本願の第２実施形態のズームレンズの望遠焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。It is a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at the time of focusing on infinity in the telephoto focal length state of the zoom lens according to the second embodiment of the present application. 本願の第３実施形態のズームレンズの広角端での光学断面図である。It is an optical sectional view at the wide-angle end of a zoom lens according to a third embodiment of the present application. 本願の第３実施形態のズームレンズの広角端状態の無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。It is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when the zoom lens of the third embodiment of the present application is focused at infinity in the wide-angle end state. 本願の第３実施形態のズームレンズの中間焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。It is a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at the time of focusing on infinity in the intermediate focal length state of the zoom lens according to the third embodiment of the present application. 本願の第３実施形態のズームレンズの望遠焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。It is a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at the time of focusing on infinity in the telephoto focal length state of the zoom lens according to the third embodiment of the present application. 本願の第４実施形態のズームレンズの広角端での光学断面図である。It is an optical sectional view at the wide-angle end of a zoom lens according to a fourth embodiment of the present application. 本願の第４実施形態のズームレンズの広角端状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。It is a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at the time of focusing on infinity in the wide-angle end state of the zoom lens according to the fourth embodiment of the present application. 本願の第４実施形態のズームレンズの中間焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。It is a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at the time of focusing on infinity in the intermediate focal length state of the zoom lens according to the fourth embodiment of the present application. 本願の第４実施形態のズームレンズの望遠焦点距離状態の無限遠合焦時の球面収差図、非点収差図、及び歪曲収差図である。It is a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at the time of focusing on infinity in the telephoto focal length state of the zoom lens according to the fourth embodiment of the present application.

以下に示す実施形態において、諸元光学データにおける面番号NSは物体側から数えたレンズ面の順番、Rはレンズ面の曲率半径、Dはレンズ面の光軸上の間隔、Nｄはｄ線（波長λ=587.6ｎｍ）に対する屈折率、νｄはｄ線（波長λ=587.6ｎｍ）に対するアッベ数をそれぞれ示している。また、面番号の後側にＳＴＯＰを付したものは、絞りを示す。面番号の後側にＡＳＰＨを付したものは、非球面を示し、その曲率半径Rの欄には該非球面の近軸曲率半径を示している。   In the embodiment described below, the surface number NS in the specification optical data is the order of the lens surfaces counted from the object side, R is the radius of curvature of the lens surfaces, D is the distance on the optical axis of the lens surfaces, and Nd is the d-line ( The refractive index with respect to the wavelength λ = 587.6 nm and νd indicate the Abbe number with respect to the d-line (wavelength λ = 587.6 nm). Also, the surface number with STOP attached to the rear side indicates a stop. The surface number with ASPH on the back side indicates an aspheric surface, and the column of the radius of curvature R indicates the paraxial radius of curvature of the aspheric surface.

（第１実施形態）
第１実施形態のズームレンズは、図１に示すように、物体側から順に、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、負の屈折力を有する第５レンズ群G5と、正の屈折力を有する第６レンズ群G6とで構成される。 (First embodiment)
As shown in FIG. 1, the zoom lens according to the first embodiment includes, 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 refraction. A third lens group G3 having power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having positive refractive power Is done.

第１レンズ群G1は、物体側から順に、物体側に凸面を向けた負の屈折力を有するメニスカスレンズL1と、正の屈折力を有するレンズL2との接合レンズと、物体側に凸面を向けた正の屈折力を有するメニスカスレンズL3とで、構成される。
第２レンズ群G2は、物体側から順に、物体側の面に非球面を有し、像側の面が強い凹面で負の屈折力を有するメニスカスレンズL4と、両凹レンズL5と、両凸レンズL6と、物体側に凹面を向けた負の屈折力を有するメニスカスレンズL7とで、構成される。
第３レンズ群G3は、物体側から順に、両面に非球面を有する両凸レンズL8と、両凹レンズL9と、両凸レンズL10とで、構成される。
第４レンズ群G4は、物体側から順に、両凸レンズL14と像側の面に非球面を有する両凹レンズL11との接合レンズで、構成される。
第５レンズ群G5は、像側に凹面を向けた負の屈折力を有するメニスカスレンズL12で、構成される。
第６レンズ群G6は、像側に凸面を向けた正の屈折力を有するメニスカスレンズL13で、構成される。 The first lens group G1, in order from the object side, is a cemented lens of a meniscus lens L1 having a negative refractive power with a convex surface facing the object side and a lens L2 having a positive refractive power, and a convex surface facing the object side. And a meniscus lens L3 having a positive refractive power.
The second lens group G2 has, in order from the object side, a meniscus lens L4 having an aspherical surface on the object side, a strong concave surface on the image side, and negative refractive power, a biconcave lens L5, and a biconvex lens L6. And a meniscus lens L7 having negative refractive power with the concave surface facing the object side.
The third lens group G3 includes, in order from the object side, a biconvex lens L8 having aspheric surfaces on both sides, a biconcave lens L9, and a biconvex lens L10.
The fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex lens L14 and a biconcave lens L11 having an aspheric surface on the image side surface.
The fifth lens group G5 includes a meniscus lens L12 having a negative refractive power with a concave surface facing the image side.
The sixth lens group G6 is composed of a meniscus lens L13 having positive refractive power with the convex surface facing the image side.

第１実施形態のズームレンズは、広角端から望遠端への変倍に際しては、第１レンズ群が物体側に移動し、第２レンズ群は像側に凸の軌跡を描きながら移動し、第３レンズ群は物体側に移動し、第４レンズ群は第３レンズ群に対して像側に凸の軌跡を描きながら移動し、第５レンズ群は物体側に移動し、第６レンズ群は像面に対し固定である。
近接物体への合焦は、第４レンズ群を像側に移動させて行う。 In the zoom lens according to the first embodiment, when zooming from the wide-angle end to the telephoto end, the first lens unit moves toward the object side, the second lens unit moves while drawing a convex locus on the image side, The third lens group moves toward the object side, the fourth lens group moves while drawing a convex locus toward the image side with respect to the third lens group, the fifth lens group moves toward the object side, and the sixth lens group It is fixed with respect to the image plane.
Focusing on a close object is performed by moving the fourth lens group to the image side.

第１実施形態のズームレンズの諸元光学データは、以下の通りである。
NS R D Nd νｄ
1 63.6829 1.3000 1.91048 31.31
2 36.5043 0.0100 1.57046 42.84
3 36.5043 5.9600 1.49845 81.61
4 -852.9715 0.2000
5 34.2606 4.0000 1.62032 63.39
6 151.8569 D( 6)
7 ASPH 54.3406 0.2000 1.51700 49.96
8 54.6285 0.8000 1.91695 35.25
9 8.9090 4.0317
10 -30.8661 0.6500 1.91695 35.25
11 23.5188 0.4000
12 17.7113 2.9807 1.93323 20.88
13 -28.4855 0.7683
14 -16.2247 0.6000 1.77621 49.62
15 -51.4542 D(15)
16 STOP 0.0000 1.2000
17 ASPH 9.1792 2.8596 1.58547 59.46
18 ASPH -21.2748 0.3952
19 -469.2779 0.5000 1.89461 30.74
20 11.3473 1.6070
21 27.4927 3.2402 1.59489 68.62
22 -9.5668 D(22)
23 48.0920 1.2000 1.81263 25.46
24 -93.4000 0.0100 1.57046 42.84
25 -93.4000 0.6000 1.80558 45.45
26 ASPH 13.0486 D(26)
27 -12.9322 0.6300 1.81263 25.46
28 -18.8160 D(28)
29 -147.0832 1.9501 1.73234 54.67
30 -35.3238 9.8000
31 0.0000 2.8000 1.51872 64.20 The optical data of the zoom lens according to the first embodiment is as follows.
NS RD Nd νd
1 63.6829 1.3000 1.91048 31.31
2 36.5043 0.0100 1.57046 42.84
3 36.5043 5.9600 1.49845 81.61
4 -852.9715 0.2000
5 34.2606 4.0000 1.62032 63.39
6 151.8569 D (6)
7 ASPH 54.3406 0.2000 1.51700 49.96
8 54.6285 0.8000 1.91695 35.25
9 8.9090 4.0317
10 -30.8661 0.6500 1.91695 35.25
11 23.5188 0.4000
12 17.7113 2.9807 1.93323 20.88
13 -28.4855 0.7683
14 -16.2247 0.6000 1.77621 49.62
15 -51.4542 D (15)
16 STOP 0.0000 1.2000
17 ASPH 9.1792 2.8596 1.58547 59.46
18 ASPH -21.2748 0.3952
19 -469.2779 0.5000 1.89461 30.74
20 11.3473 1.6070
21 27.4927 3.2402 1.59489 68.62
22 -9.5668 D (22)
23 48.0920 1.2000 1.81263 25.46
24 -93.4000 0.0100 1.57046 42.84
25 -93.4000 0.6000 1.80558 45.45
26 ASPH 13.0486 D (26)
27 -12.9322 0.6300 1.81263 25.46
28 -18.8160 D (28)
29 -147.0832 1.9501 1.73234 54.67
30 -35.3238 9.8000
31 0.0000 2.8000 1.51872 64.20

上記諸元光学データにおいて面番号の後側にASPHを付した非球面は、次式で表される。
X(y)＝（ｙ2／Ｒ）／〔１＋（１−ε・ｙ2／Ｒ2）1/2〕＋Ａ4・ｙ4＋Ａ6・ｙ6＋Ａ8・ｙ8＋Ａ10・ｙ10
ここで、X(y)は光軸から垂直方向の高さｙにおける各非球面の頂点から光軸方向に沿った距離（サグ量）、Ｒは基準球面の曲率半径（近軸曲率半径）、εは円錐係数、Ａ4,Ａ6,Ａ8,Ａ10を非球面係数とする。 The aspherical surface with ASPH on the back side of the surface number in the above-mentioned optical data is expressed by the following equation.
X (y) = (y 2 / R) / [1+ (1−ε · y 2 / R 2 ) 1/2 ] + A 4 · y 4 + A 6 · y 6 + A 8 · y 8 + A 10 · y 10
Here, X (y) is the distance (sag amount) along the optical axis direction from the apex of each aspheric surface at the height y in the vertical direction from the optical axis, R is the curvature radius (paraxial curvature radius) of the reference spherical surface, ε is a conical coefficient, and A4, A6, A8, and A10 are aspheric coefficients.

非球面の諸元光学データは、以下の通りである。
ASPH ε A4 A6 A8 A10
7 1.0000 1.91163e-005 -4.04139e-007 3.49343e-009 -1.49337e-011
17 1.0000 -1.14585e-004 4.99824e-006 -1.46840e-007 -1.08200e-009
18 1.0000 4.60442e-004 5.38067e-006 -2.32614e-007 0.00000e+000
26 1.0000 -6.79774e-006 -5.35988e-008 4.43501e-009 -9.66065e-011 The optical data of the aspheric surface is as follows.
ASPH ε A4 A6 A8 A10
7 1.0000 1.91163e-005 -4.04139e-007 3.49343e-009 -1.49337e-011
17 1.0000 -1.14585e-004 4.99824e-006 -1.46840e-007 -1.08200e-009
18 1.0000 4.60442e-004 5.38067e-006 -2.32614e-007 0.00000e + 000
26 1.0000 -6.79774e-006 -5.35988e-008 4.43501e-009 -9.66065e-011

以下に、ズーム作動における面間隔の変化、すなわち広角端状態(f=10.30mm)、中間焦点距離状態(f=30.47mm)及び望遠端状態(f=97.97mm)の面間隔を、焦点距離fmm、ＦナンバーFno、画角ω、と共に示す。
f 10.30 30.47 97.97
Fno 3.6490 5.0069 5.7049
ω 40.281 11.231 4.671
D( 6) 0.9300 15.4076 32.7201
D(15) 20.1523 7.8284 1.9719
D(22) 1.2330 2.6313 1.5000
D(26) 7.2929 5.8946 7.0259
D(28) 0.4190 11.1985 17.2290 In the following, the change in the surface interval in zoom operation, that is, the surface interval in the wide-angle end state (f = 10.30 mm), the intermediate focal length state (f = 30.47 mm) and the telephoto end state (f = 97.97 mm) , F number Fno and angle of view ω.
f 10.30 30.47 97.97
Fno 3.6490 5.0069 5.7049
ω 40.281 11.231 4.671
D (6) 0.9300 15.4076 32.7201
D (15) 20.1523 7.8284 1.9719
D (22) 1.2330 2.6313 1.5000
D (26) 7.2929 5.8946 7.0259
D (28) 0.4190 11.1985 17.2290

以下に、広角端状態(f=10.30)、中間焦点距離状態(f=30.47)及び望遠端状態(f=97.97)での近接物体合焦時の面間隔を、無限物体合焦時の焦点距離f(mm)、第１レンズ面から物体までの距離D(0)(mm)、と共に示す。
f 10.30 30.47 97.97
D( 0) 920.28 903.19 889.86
D(22) 1.2704 3.3008 2.9038
D(26) 7.2555 5.2251 5.6221 The following is the surface distance when focusing on a close object in the wide-angle end state (f = 10.30), intermediate focal length state (f = 30.47), and telephoto end state (f = 97.97). It is shown together with f (mm) and the distance D (0) (mm) from the first lens surface to the object.
f 10.30 30.47 97.97
D (0) 920.28 903.19 889.86
D (22) 1.2704 3.3008 2.9038
D (26) 7.2555 5.2251 5.6221

（第２実施形態）
第２実施形態のズームレンズは、図５に示すように、物体側から順に、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、負の屈折力を有する第５レンズ群G5と、正の屈折力を有する第６レンズ群G6とで構成される。 (Second Embodiment)
As shown in FIG. 5, the zoom lens according to the second embodiment includes, 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 refraction. A third lens group G3 having power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having positive refractive power Is done.

第１レンズ群G1は、物体側から順に、物体側に凸面を向けた負の屈折力を有するメニスカスレンズL1と、正の屈折力を有するレンズL2との接合レンズと、物体側に凸面を向けた正の屈折力を有するメニスカスレンズL3とで、構成される。
第２レンズ群G2は、物体側から順に、物体側の面に非球面を有し、像側の面が強い凹面で負の屈折力を有するメニスカスレンズL4と、両凹レンズL5と、両凸レンズL6と、物体側に凹面を向けた負の屈折力を有するメニスカスレンズL7とで、構成される。
第３レンズ群G3は、物体側から順に、両面に非球面を有する両凸レンズL8と、像側に凹面を向けた負レンズL9と、物体側に非球面を有する両凸レンズL10と物体側に凹面を向けた負の屈折力を有するメニスカスレンズL11との接合レンズと、像側に凹面を向けた負の屈折力を有するメニスカスレンズL12と両凸レンズL13との接合レンズとで、構成される。
第４レンズ群G4は、物体側から順に、両凸レンズL14と両凹レンズL15との接合レンズで、構成される。
第５レンズ群G5は、像側に凹面を向けた負の屈折力を有するメニスカスレンズL16で、構成される。
第６レンズ群G6は、像側に凸面を向けた正の屈折力を有するメニスカスレンズL17で、構成される。 The first lens group G1, in order from the object side, is a cemented lens of a meniscus lens L1 having a negative refractive power with a convex surface facing the object side and a lens L2 having a positive refractive power, and a convex surface facing the object side. And a meniscus lens L3 having a positive refractive power.
The second lens group G2 has, in order from the object side, a meniscus lens L4 having an aspherical surface on the object side, a strong concave surface on the image side, and negative refractive power, a biconcave lens L5, and a biconvex lens L6. And a meniscus lens L7 having negative refractive power with the concave surface facing the object side.
In order from the object side, the third lens group G3 includes a biconvex lens L8 having aspheric surfaces on both sides, a negative lens L9 having a concave surface facing the image side, a biconvex lens L10 having an aspheric surface on the object side, and a concave surface on the object side. The lens is composed of a cemented lens with a meniscus lens L11 having negative refractive power facing the lens and a cemented lens with a meniscus lens L12 having negative refractive power facing the image side and a biconvex lens L13.
The fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex lens L14 and a biconcave lens L15.
The fifth lens group G5 includes a meniscus lens L16 having a negative refractive power with a concave surface facing the image side.
The sixth lens group G6 includes a meniscus lens L17 having a positive refractive power and a convex surface directed toward the image side.

第２実施形態のズームレンズは、広角端から望遠端への変倍に際しては、第１レンズ群が物体側に移動し、第２レンズ群は像側に凸の軌跡を描きながら移動し、第３レンズ群は物体側に移動し、第４レンズ群は第３レンズ群に対して像側に凸の軌跡を描きながら移動し、第５レンズ群は物体側に移動し、第６レンズ群は像面に対し固定である。
近接物体への合焦は、第４レンズ群を像側に移動させて行う。 In the zoom lens according to the second embodiment, when zooming from the wide-angle end to the telephoto end, the first lens group moves toward the object side, the second lens group moves while drawing a convex locus on the image side, The third lens group moves toward the object side, the fourth lens group moves while drawing a convex locus toward the image side with respect to the third lens group, the fifth lens group moves toward the object side, and the sixth lens group It is fixed with respect to the image plane.
Focusing on a close object is performed by moving the fourth lens group to the image side.

第２実施形態のズームレンズの諸元光学データは、以下の通りである。
NS R D Nd νｄ
1 71.8184 1.3000 1.91048 31.31
2 38.1169 0.0100 1.57046 42.84
3 38.1169 4.5000 1.49845 81.61
4 -271.5053 0.2000
5 34.2543 3.5128 1.62032 63.39
6 144.7606 D( 6)
7 ASPH 51.0704 0.2000 1.51700 49.96
8 43.5620 0.7600 1.91695 35.25
9 9.1890 3.7360
10 -21.5757 0.6040 1.91695 35.25
11 29.1538 0.4000
12 20.4299 2.7524 1.93323 20.88
13 -21.6790 0.7155
14 -12.4871 0.5960 1.77621 49.62
15 -39.8843 D(15)
16 STOP 0.0000 1.2000
17 ASPH 10.5362 2.8018 1.58547 59.46
18 ASPH -22.5427 0.2000
19 158.7690 0.5000 1.83945 42.72
20 12.7924 1.5947
21 ASPH 43.3184 2.3000 1.58547 59.46
22 -12.8698 0.0100 1.57046 42.84
23 -12.8698 0.4670 1.91048 31.31
24 -21.0076 0.8760
25 64.1680 0.4670 1.91695 35.25
26 15.3783 0.0100 1.57046 42.84
27 15.3783 3.0765 1.62032 63.39
28 -13.0505 D(28)
29 41.5408 1.3000 1.81263 25.46
30 -58.6162 0.0100 1.57046 42.84
31 -58.6162 0.4830 1.80831 46.50
32 12.0837 D(32)
33 -15.2307 0.6300 1.81263 25.46
34 -23.6034 D(34)
35 -87.2068 1.9569 1.73234 54.67
36 -27.2049 9.8000
37 0.0000 2.8000 1.51872 64.20 The optical data of the zoom lens according to the second embodiment is as follows.
NS RD Nd νd
1 71.8184 1.3000 1.91048 31.31
2 38.1169 0.0100 1.57046 42.84
3 38.1169 4.5000 1.49845 81.61
4 -271.5053 0.2000
5 34.2543 3.5128 1.62032 63.39
6 144.7606 D (6)
7 ASPH 51.0704 0.2000 1.51700 49.96
8 43.5620 0.7600 1.91695 35.25
9 9.1890 3.7360
10 -21.5757 0.6040 1.91695 35.25
11 29.1538 0.4000
12 20.4299 2.7524 1.93323 20.88
13 -21.6790 0.7155
14 -12.4871 0.5960 1.77621 49.62
15 -39.8843 D (15)
16 STOP 0.0000 1.2000
17 ASPH 10.5362 2.8018 1.58547 59.46
18 ASPH -22.5427 0.2000
19 158.7690 0.5000 1.83945 42.72
20 12.7924 1.5947
21 ASPH 43.3184 2.3000 1.58547 59.46
22 -12.8698 0.0100 1.57046 42.84
23 -12.8698 0.4670 1.91048 31.31
24 -21.0076 0.8760
25 64.1680 0.4670 1.91695 35.25
26 15.3783 0.0100 1.57046 42.84
27 15.3783 3.0765 1.62032 63.39
28 -13.0505 D (28)
29 41.5408 1.3000 1.81263 25.46
30 -58.6162 0.0100 1.57046 42.84
31 -58.6162 0.4830 1.80831 46.50
32 12.0837 D (32)
33 -15.2307 0.6300 1.81263 25.46
34 -23.6034 D (34)
35 -87.2068 1.9569 1.73234 54.67
36 -27.2049 9.8000
37 0.0000 2.8000 1.51872 64.20

非球面の諸元光学データは、以下の通りである。
ASPH ε A4 A6 A8 A10
7 1.0000 2.99229e-005 -2.77911e-007 4.08113e-009 -6.45590e-012
17 1.0000 -9.24021e-005 -2.03212e-006 1.09833e-007 -3.07901e-009
18 1.0000 2.42296e-004 -3.20842e-006 1.17483e-007 -3.05003e-009
21 1.0000 -1.20912e-005 -1.01954e-006 2.87946e-008 -2.68033e-010 The optical data of the aspheric surface is as follows.
ASPH ε A4 A6 A8 A10
7 1.0000 2.99229e-005 -2.77911e-007 4.08113e-009 -6.45590e-012
17 1.0000 -9.24021e-005 -2.03212e-006 1.09833e-007 -3.07901e-009
18 1.0000 2.42296e-004 -3.20842e-006 1.17483e-007 -3.05003e-009
21 1.0000 -1.20912e-005 -1.01954e-006 2.87946e-008 -2.68033e-010

以下に、ズーム作動における面間隔の変化、すなわち広角端状態(f=11.22)、中間焦点距離状態(f=63.64)及び望遠端状態(f=145.52)の面間隔を、焦点距離f(mm)、ＦナンバーFno、画角ω、と共に示す。
f 11.22 63.64 145.52
Fno 3.6414 5.3644 5.7509
ω 37.997 9.208 3.170
D( 6) 0.9300 21.8749 36.7527
D(15) 18.6221 4.8769 1.4250
D(28) 1.1900 4.2490 1.0100
D(32) 8.8421 5.7832 9.0221
D(34) 0.8860 15.9875 20.1532 The following is the change in the surface interval during zoom operation, that is, the surface interval in the wide-angle end state (f = 11.22), the intermediate focal length state (f = 63.64), and the telephoto end state (f = 145.52), and the focal length f (mm). , F number Fno and angle of view ω.
f 11.22 63.64 145.52
Fno 3.6414 5.3644 5.7509
ω 37.997 9.208 3.170
D (6) 0.9300 21.8749 36.7527
D (15) 18.6221 4.8769 1.4250
D (28) 1.1900 4.2490 1.0100
D (32) 8.8421 5.7832 9.0221
D (34) 0.8860 15.9875 20.1532

以下に、広角端状態(f=11.22)、中間焦点距離状態(f=63.64)及び望遠端状態(f=145.52)での近接物体合焦時の面間隔を、無限物体合焦時の焦点距離f(mm)、第１レンズ面から物体までの距離D(0)(mm)、と共に示す。
f 11.22 63.64 145.52
D( 0) 918.76 896.55 880.86
D(28) 1.2267 4.6723 3.4247
D(32) 8.8054 5.3598 6.6074 The following shows the surface distance when focusing on a close object in the wide-angle end state (f = 11.22), intermediate focal length state (f = 63.64), and telephoto end state (f = 145.52). It is shown together with f (mm) and the distance D (0) (mm) from the first lens surface to the object.
f 11.22 63.64 145.52
D (0) 918.76 896.55 880.86
D (28) 1.2267 4.6723 3.4247
D (32) 8.8054 5.3598 6.6074

（第３実施形態）
第３実施形態のズームレンズは、図９に示すように、物体側から順に、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、負の屈折力を有する第５レンズ群G5と、正の屈折力を有する第６レンズ群G6とで構成される。 (Third embodiment)
As shown in FIG. 9, the zoom lens according to the third embodiment includes, 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 refraction. A third lens group G3 having power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having positive refractive power Is done.

第１レンズ群G1は、物体側から順に、物体側に凸面を向けた負の屈折力を有するメニスカスレンズL1と、正の屈折力を有するレンズL2との接合レンズと、物体側に凸面を向けた正の屈折力を有するメニスカスレンズL3とで、構成される。
第２レンズ群G2は、物体側から順に、物体側の面に非球面を有し、像側の面が強い凹面で負の屈折力を有するメニスカスレンズL4と、両凹レンズL5と、両凸レンズL6と、物体側に凹面を向けた負の屈折力を有するメニスカスレンズL7とで、構成される。
第３レンズ群G3は、物体側から順に、両面に非球面を有する両凸レンズL8と、像側に凹面を向けた負レンズL9と、物体側に非球面を有する両凸レンズL10と物体側に凹面を向けた負の屈折力を有するメニスカスレンズL11との接合レンズと、像側に凹面を向けた負の屈折力を有するメニスカスレンズL12と両凸レンズL13との接合レンズとで、構成される。 The first lens group G1, in order from the object side, is a cemented lens of a meniscus lens L1 having a negative refractive power with a convex surface facing the object side and a lens L2 having a positive refractive power, and a convex surface facing the object side. And a meniscus lens L3 having a positive refractive power.
The second lens group G2 has, in order from the object side, a meniscus lens L4 having an aspherical surface on the object side, a strong concave surface on the image side, and negative refractive power, a biconcave lens L5, and a biconvex lens L6. And a meniscus lens L7 having negative refractive power with the concave surface facing the object side.
In order from the object side, the third lens group G3 includes a biconvex lens L8 having aspheric surfaces on both sides, a negative lens L9 having a concave surface facing the image side, a biconvex lens L10 having an aspheric surface on the object side, and a concave surface on the object side. The lens is composed of a cemented lens with a meniscus lens L11 having negative refractive power facing the lens and a cemented lens with a meniscus lens L12 having negative refractive power facing the image side and a biconvex lens L13.

第４レンズ群G4は、物体側から順に、両凸レンズL14と両凹レンズL15との接合レンズで、構成される。
第５レンズ群G5は、像側に凹面を向けた負の屈折力を有するメニスカスレンズL16で、構成される。
第６レンズ群G6は、像側に凸面を向けた正の屈折力を有するメニスカスレンズL17で、構成される。 The fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex lens L14 and a biconcave lens L15.
The fifth lens group G5 includes a meniscus lens L16 having a negative refractive power with a concave surface facing the image side.
The sixth lens group G6 includes a meniscus lens L17 having a positive refractive power and a convex surface directed toward the image side.

第３実施形態のズームレンズは、広角端から望遠端への変倍に際しては、第１レンズ群が物体側に移動し、第２レンズ群は像側に凸の軌跡を描きながら移動し、第３レンズ群は物体側に移動し、第４レンズ群は第３レンズ群に対して像側に凸の軌跡を描きながら移動し、第５レンズ群は物体側に移動し、第６レンズ群は像面に対し固定である。
近接物体への合焦は、第４レンズ群を像側に移動させて行う。 In the zoom lens according to the third embodiment, when zooming from the wide-angle end to the telephoto end, the first lens unit moves to the object side, the second lens unit moves while drawing a convex locus on the image side, The third lens group moves toward the object side, the fourth lens group moves while drawing a convex locus toward the image side with respect to the third lens group, the fifth lens group moves toward the object side, and the sixth lens group It is fixed with respect to the image plane.
Focusing on a close object is performed by moving the fourth lens group to the image side.

第３施形態のズームレンズの諸元光学データは、以下の通りである。
NS R D Nd νｄ
1 109.0553 1.5000 1.90366 31.31
2 52.5697 0.0100 1.56732 42.84
3 52.5697 5.5700 1.49700 81.61
4 -146.2327 0.2000
5 39.5728 3.9700 1.61800 63.39
6 112.3407 D( 6)
7 ASPH 79.0234 0.2000 1.51460 49.96
8 65.0676 0.9000 1.91082 35.25
9 12.3717 4.1854
10 -23.8730 0.7500 1.91082 35.25
11 42.3962 0.4930
12 28.5426 3.3730 1.92286 20.88
13 -24.6589 1.0150
14 -14.8587 0.7500 1.77250 49.62
15 -49.5781 D(15)
16 STOP 0.0000 1.5000
17 ASPH 13.2954 3.2480 1.58313 59.46
18 ASPH -32.0948 0.2000
19 62.5251 0.6200 1.86188 42.08
20 15.8491 2.0200
21 ASPH 61.7390 2.8500 1.58313 59.46
22 -15.2253 0.0100 1.56732 42.84
23 -15.2253 0.6000 1.90766 33.41
24 -25.8791 1.0200
25 109.2068 0.5800 1.91082 35.25
26 20.0859 0.0100 1.56732 42.84
27 20.0859 3.7247 1.61882 64.32
28 -16.2282 D(28)
29 51.3428 1.6830 1.80518 25.46
30 -75.7267 0.0100 1.56732 42.84
31 -75.7267 0.6000 1.80420 46.50
32 15.6073 D(32)
33 -18.5559 0.9000 1.80518 25.46
34 -28.5021 D(34)
35 -152.2485 2.3543 1.72916 54.67
36 -38.5471 11.0000
37 0.0000 4.2000 1.51680 64.20 The optical data of the zoom lens according to the third embodiment is as follows.
NS RD Nd νd
1 109.0553 1.5000 1.90366 31.31
2 52.5697 0.0100 1.56732 42.84
3 52.5697 5.5700 1.49700 81.61
4 -146.2327 0.2000
5 39.5728 3.9700 1.61800 63.39
6 112.3407 D (6)
7 ASPH 79.0234 0.2000 1.51460 49.96
8 65.0676 0.9000 1.91082 35.25
9 12.3717 4.1854
10 -23.8730 0.7500 1.91082 35.25
11 42.3962 0.4930
12 28.5426 3.3730 1.92286 20.88
13 -24.6589 1.0150
14 -14.8587 0.7500 1.77250 49.62
15 -49.5781 D (15)
16 STOP 0.0000 1.5000
17 ASPH 13.2954 3.2480 1.58313 59.46
18 ASPH -32.0948 0.2000
19 62.5251 0.6200 1.86188 42.08
20 15.8491 2.0200
21 ASPH 61.7390 2.8500 1.58313 59.46
22 -15.2253 0.0100 1.56732 42.84
23 -15.2253 0.6000 1.90766 33.41
24 -25.8791 1.0200
25 109.2068 0.5800 1.91082 35.25
26 20.0859 0.0100 1.56732 42.84
27 20.0859 3.7247 1.61882 64.32
28 -16.2282 D (28)
29 51.3428 1.6830 1.80518 25.46
30 -75.7267 0.0100 1.56732 42.84
31 -75.7267 0.6000 1.80420 46.50
32 15.6073 D (32)
33 -18.5559 0.9000 1.80518 25.46
34 -28.5021 D (34)
35 -152.2485 2.3543 1.72916 54.67
36 -38.5471 11.0000
37 0.0000 4.2000 1.51680 64.20

非球面の諸元光学データは、以下の通りである。
ASPH ε A4 A6 A8 A10
7 1.0000 1.19556e-005 -5.12224e-008 4.21707e-010 2.89639e-012
17 1.0000 -4.81203e-005 -6.04617e-007 2.40398e-008 -4.15344e-010
18 1.0000 1.17843e-004 -9.32847e-007 2.61092e-008 -4.24829e-010
21 1.0000 -5.75515e-006 -1.80638e-007 2.44731e-009 -5.43340e-012 The optical data of the aspheric surface is as follows.
ASPH ε A4 A6 A8 A10
7 1.0000 1.19556e-005 -5.12224e-008 4.21707e-010 2.89639e-012
17 1.0000 -4.81203e-005 -6.04617e-007 2.40398e-008 -4.15344e-010
18 1.0000 1.17843e-004 -9.32847e-007 2.61092e-008 -4.24829e-010
21 1.0000 -5.75515e-006 -1.80638e-007 2.44731e-009 -5.43340e-012

以下に、ズーム作動における面間隔の変化、すなわち広角端状態(f=14.43)、中間焦点距離状態(f=57.85)及び望遠端状態(f=145.40)の面間隔を、焦点距離f(mm)、ＦナンバーFno、画角ω、と共に示す。
f 14.43 57.85 145.40
Fno 3.6708 5.4085 5.9148
ω 37.102 10.651 3.671
D( 6) 1.1330 24.2823 41.7003
D(15) 21.7353 5.4909 1.7000
D(28) 1.4374 6.0872 3.6419
D(32) 12.1029 7.4531 9.8984
D(34) 1.0300 19.1189 24.8250 Below, the change in the surface interval during zoom operation, that is, the surface interval in the wide-angle end state (f = 14.43), the intermediate focal length state (f = 57.85), and the telephoto end state (f = 145.40), the focal length f (mm) , F number Fno and angle of view ω.
f 14.43 57.85 145.40
Fno 3.6708 5.4085 5.9148
ω 37.102 10.651 3.671
D (6) 1.1330 24.2823 41.7003
D (15) 21.7353 5.4909 1.7000
D (28) 1.4374 6.0872 3.6419
D (32) 12.1029 7.4531 9.8984
D (34) 1.0300 19.1189 24.8250

以下に、広角端状態(f=14.43)、中間焦点距離状態(f=57.85)及び望遠端状態(f=145.40)での近接物体合焦時の面間隔を、無限物体合焦時の焦点距離f(mm)、第１レンズ面から物体までの距離D(0)(mm)、と共に示す。
f 14.43 57.85 145.40
D( 0) 901.52 876.67 857.15
D(28) 1.5087 6.7510 6.5503
D(32) 12.0316 6.7893 6.9900 The following is the surface distance when focusing on a close object in the wide-angle end state (f = 14.43), intermediate focal length state (f = 57.85), and telephoto end state (f = 145.40). It is shown together with f (mm) and the distance D (0) (mm) from the first lens surface to the object.
f 14.43 57.85 145.40
D (0) 901.52 876.67 857.15
D (28) 1.5087 6.7510 6.5503
D (32) 12.0316 6.7893 6.9900

（第４実施形態）
第４実施形態のズームレンズは、図１３に示すように、物体側から順に、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、負の屈折力を有する第５レンズ群G5とで構成される。 (Fourth embodiment)
As shown in FIG. 13, the zoom lens according to the fourth embodiment includes, 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 refraction. The third lens group G3 having power, the fourth lens group G4 having negative refractive power, and the fifth lens group G5 having negative refractive power.

第１レンズ群G1は、物体側から順に、物体側に凸面を向けた負の屈折力を有するメニスカスレンズL1と、正の屈折力を有するレンズL2との接合レンズと、物体側に凸面を向けた正の屈折力を有するメニスカスレンズL3とで、構成される。
第２レンズ群G2は、物体側から順に、物体側の面に非球面を有し、像側の面が強い凹面で負の屈折力を有するメニスカスレンズL4と、両凹レンズL5と、両凸レンズL6と、物体側に凹面を向けた負の屈折力を有するメニスカスレンズL7とで、構成される。
第３レンズ群G3は、物体側から順に、両面に非球面を有する両凸レンズL8と、両凹レンズL9と、両凸レンズL10とで、構成される。
第４レンズ群G4は、物体側から順に、両凸レンズL11と両凹レンズL12との接合レンズで、構成される。
第５レンズ群G5は、像側に凹面を向けた負の屈折力を有するメニスカスレンズL13と、像側に凸面を向けた正の屈折力を有するメニスカスレンズL14とで、構成される。 The first lens group G1, in order from the object side, is a cemented lens of a meniscus lens L1 having a negative refractive power with a convex surface facing the object side and a lens L2 having a positive refractive power, and a convex surface facing the object side. And a meniscus lens L3 having a positive refractive power.
The second lens group G2 has, in order from the object side, a meniscus lens L4 having an aspherical surface on the object side, a strong concave surface on the image side, and negative refractive power, a biconcave lens L5, and a biconvex lens L6. And a meniscus lens L7 having negative refractive power with the concave surface facing the object side.
The third lens group G3 includes, in order from the object side, a biconvex lens L8 having aspheric surfaces on both sides, a biconcave lens L9, and a biconvex lens L10.
The fourth lens group G4 is composed of a cemented lens of a biconvex lens L11 and a biconcave lens L12 in order from the object side.
The fifth lens group G5 includes a meniscus lens L13 having a negative refractive power with a concave surface facing the image side, and a meniscus lens L14 having a positive refractive power with a convex surface facing the image side.

第３実施形態のズームレンズは、広角端から望遠端への変倍に際しては、第１レンズ群が物体側に移動し、第２レンズ群は像側に凸の軌跡を描きながら移動し、第３レンズ群は物体側に移動し、第４レンズ群は第３レンズ群に対して像側に凸の軌跡を描きながら移動し、第５レンズ群は物体側に移動する。
近接物体への合焦は、第４レンズ群を像側に移動させて行う。 In the zoom lens according to the third embodiment, when zooming from the wide-angle end to the telephoto end, the first lens unit moves to the object side, the second lens unit moves while drawing a convex locus on the image side, The third lens group moves toward the object side, the fourth lens group moves while drawing a locus convex toward the image side with respect to the third lens group, and the fifth lens group moves toward the object side.
Focusing on a close object is performed by moving the fourth lens group to the image side.

第４施形態のズームレンズの諸元光学データは、以下の通りである。
NS R D Nd νｄ
1 64.9819 1.3000 1.90366 31.31
2 36.3975 0.0100 1.56732 42.84
3 36.3975 6.6600 1.49700 81.61
4 -1186.1757 0.2000
5 34.2934 4.2232 1.61800 63.39
6 162.5347 D( 6)
7 ASPH 33.6698 0.2000 1.51460 49.96
8 36.8067 0.8000 1.91082 35.25
9 8.1262 4.0531
10 -29.8667 0.6500 1.91082 35.25
11 20.0064 0.4000
12 15.8824 2.9802 1.92286 20.88
13 -31.7119 0.7663
14 -16.6818 0.6000 1.77250 49.62
15 -54.0405 D(15)
16 STOP 0.0000 1.2000
17 ASPH 9.0025 3.2330 1.58313 59.46
18 ASPH -17.0238 0.4600
19 -52.2330 0.5000 1.90366 31.31
20 12.6447 1.5345
21 46.2818 2.9182 1.59282 68.62
22 -9.5695 D(22)
23 100.3805 1.2000 1.80518 25.46
24 -28.6956 0.0100 1.56732 42.84
25 -28.6956 0.6000 1.80139 45.45
26 ASPH 19.7020 D(26)
27 -10.7494 0.6300 1.80518 25.46
28 -17.3803 0.2000
29 -4854.1028 2.1691 1.48749 70.44
30 -20.5041 D(30)
31 0.0000 9.8000
32 0.0000 2.8000 1.51680 64.20 The optical data of the zoom lens according to the fourth embodiment is as follows.
NS RD Nd νd
1 64.9819 1.3000 1.90366 31.31
2 36.3975 0.0100 1.56732 42.84
3 36.3975 6.6600 1.49700 81.61
4 -1186.1757 0.2000
5 34.2934 4.2232 1.61800 63.39
6 162.5347 D (6)
7 ASPH 33.6698 0.2000 1.51460 49.96
8 36.8067 0.8000 1.91082 35.25
9 8.1262 4.0531
10 -29.8667 0.6500 1.91082 35.25
11 20.0064 0.4000
12 15.8824 2.9802 1.92286 20.88
13 -31.7119 0.7663
14 -16.6818 0.6000 1.77250 49.62
15 -54.0405 D (15)
16 STOP 0.0000 1.2000
17 ASPH 9.0025 3.2330 1.58313 59.46
18 ASPH -17.0238 0.4600
19 -52.2330 0.5000 1.90366 31.31
20 12.6447 1.5345
21 46.2818 2.9182 1.59282 68.62
22 -9.5695 D (22)
23 100.3805 1.2000 1.80518 25.46
24 -28.6956 0.0100 1.56732 42.84
25 -28.6956 0.6000 1.80139 45.45
26 ASPH 19.7020 D (26)
27 -10.7494 0.6300 1.80518 25.46
28 -17.3803 0.2000
29 -4854.1028 2.1691 1.48749 70.44
30 -20.5041 D (30)
31 0.0000 9.8000
32 0.0000 2.8000 1.51680 64.20

非球面の諸元光学データは、以下の通りである。
ASPH ε A4 A6 A8 A10
7 1.0000 -1.81150e-006 -3.53409e-007 2.30973e-009 -1.22024e-011
17 1.0000 -1.28660e-004 1.17974e-006 -4.72888e-008 -2.76128e-009
18 1.0000 4.39407e-004 1.33550e-006 -1.82741e-007 0.00000e+000
26 1.0000 -2.01216e-005 -1.13690e-006 1.04261e-007 -2.22909e-009 The optical data of the aspheric surface is as follows.
ASPH ε A4 A6 A8 A10
7 1.0000 -1.81150e-006 -3.53409e-007 2.30973e-009 -1.22024e-011
17 1.0000 -1.28660e-004 1.17974e-006 -4.72888e-008 -2.76128e-009
18 1.0000 4.39407e-004 1.33550e-006 -1.82741e-007 0.00000e + 000
26 1.0000 -2.01216e-005 -1.13690e-006 1.04261e-007 -2.22909e-009

以下に、ズーム作動における面間隔の変化、すなわち広角端状態(f=10.31mm)、中間焦点距離状態(f=41.50mm)及び望遠端状態(f=100.60mm)の面間隔を、焦点距離fmm、ＦナンバーFno、画角ω、と共に示す。
f 10.31 41.50 100.60
Fno 3.657 5.267 5.799
ω 40.1947 10.9138 4.5726
D( 6) 0.9310 19.9590 33.2042
D(15) 19.0512 4.6009 1.6230
D(22) 1.9788 3.7822 0.5120
D(26) 7.0763 5.2729 8.5431
D(30) 0.0000 13.7884 20.1450 The following is the change in the surface interval during zoom operation, that is, the surface interval in the wide-angle end state (f = 10.31 mm), the intermediate focal length state (f = 41.50 mm), and the telephoto end state (f = 100.60 mm). , F number Fno and angle of view ω.
f 10.31 41.50 100.60
Fno 3.657 5.267 5.799
ω 40.1947 10.9138 4.5726
D (6) 0.9310 19.9590 33.2042
D (15) 19.0512 4.6009 1.6230
D (22) 1.9788 3.7822 0.5120
D (26) 7.0763 5.2729 8.5431
D (30) 0.0000 13.7884 20.1450

以下に、広角端状態(f=10.31)、中間焦点距離状態(f=41.50)及び望遠端状態(f=100.60)での近接物体合焦時の面間隔を、無限物体合焦時の焦点距離f(mm)、第１レンズ面から物体までの距離D(0)(mm)、と共に示す。
f 10.31 41.50 100.60
D( 0) 919.86 901.49 884.90
D(22) 2.0430 4.3047 2.5769
D(26) 7.0121 4.7504 6.4782 The following is the surface distance when focusing on a close object in the wide-angle end state (f = 10.31), intermediate focal length state (f = 41.50), and telephoto end state (f = 100.60). It is shown together with f (mm) and the distance D (0) (mm) from the first lens surface to the object.
f 10.31 41.50 100.60
D (0) 919.86 901.49 884.90
D (22) 2.0430 4.3047 2.5769
D (26) 7.0121 4.7504 6.4782

各実施形態における条件式に係る値は、以下の通りである。
第１実施形態 第２実施形態 第３実施形態 第４実施形態
βｒｔ 2.911 3.162 2.999 2.502
ｆｒｔ/ｆｔ -0.391 -0.460 -0.503 -3.020
β2t/β2w 4.540 6.759 4.488 4.414
ｆｒw/ｆ2 2.335 2.760 2.848 3.326 The values related to the conditional expressions in each embodiment are as follows.
First embodiment Second embodiment Third embodiment Fourth embodiment βrt 2.911 3.162 2.999 2.502
frt / ft -0.391 -0.460 -0.503 -3.020
β2t / β2w 4.540 6.759 4.488 4.414
frw / f2 2.335 2.760 2.848 3.326

ＳＴＯＰ 絞り
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
Ｇ５ 第５レンズ群
Ｇ６ 第６レンズ群 STOP diaphragm G1 first lens group G2 second lens group G3 third lens group G4 fourth lens group G5 fifth lens group G6 sixth lens group

Claims (8)

物体側から順に、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、第４レンズ群と、負の屈折力を有する第５レンズ群とを有し、
変倍時に隣り合うレンズ群の間隔が変化し、前記第１レンズ群は物体側から順に負レンズ、正レンズ、及び正レンズから構成され、前記第５レンズ群は最も物体側に負レンズを有し、以下の条件を満足するズームレンズ。
2.0 < βｒｔ < 3.5 ・・・・・・・(1)
2.760≦ ｆｒw/ｆ2 < 3.4 ・・・・・・・(4)
但し、
βｒｔ： 第３レンズ群より像側に位置するレンズ群の望遠端に於ける合成横倍率
ｆｒw： 第３レンズ群より像側に位置するレンズ群の広角端に於ける合成焦点距離
ｆ2 ： 前記第２レンズ群の焦点距離 In order from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group, and negative refraction A fifth lens group having power,
The distance between adjacent lens groups changes during zooming, the first lens group is composed of a negative lens, a positive lens, and a positive lens in order from the object side, and the fifth lens group has a negative lens on the most object side. Zoom lens that satisfies the following conditions.
2.0 <βrt <3.5 (1)
2.760 ≦ frw / f2 <3.4 (4)
However,
βrt: Composite lateral magnification at the telephoto end of the lens unit located on the image side from the third lens unit
frw: Composite focal length at the wide angle end of the lens unit located on the image side of the third lens unit
f2: focal length of the second lens group 以下の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。
-0.8 < ｆｒｔ/ｆｔ < -0.3 ・・・・・・・・(2)
但し、
ｆｒｔ： 第３レンズ群より像側に位置するレンズ群の望遠端に於ける合成焦点距離
ｆｔ ： 望遠端に於ける前記ズームレンズの焦点距離 The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
-0.8 <frt / ft <-0.3 (2)
However,
frt: Composite focal length at the telephoto end of the lens unit located on the image side of the third lens unit ft: Focal length of the zoom lens at the telephoto end 前記第２レンズ群が以下の条件式を満足することを特徴とする請求項１又は２に記載のズームレンズ。
3.5 < β2t/β2w < 8.0 ・・・・・・・・・(3)
但し、
β2ｔ： 第２レンズ群の望遠端に於ける横倍率
β2w ： 第２レンズ群の広角端に於ける横倍率 The zoom lens according to claim 1, wherein the second lens group satisfies the following conditional expression.
3.5 <β2t / β2w <8.0 (3)
However,
β2t: Lateral magnification at the telephoto end of the second lens group β2w: Lateral magnification at the wide-angle end of the second lens group 広角端状態から望遠端状態へ変倍する際に、前記第１レンズ群が、広角端状態より望遠端状態で、物体側に位置することを特徴とした請求項１から請求項３のうちの一項に記載のズームレンズ。   4. The zoom lens according to claim 1, wherein the first lens unit is positioned closer to the object side in the telephoto end state than in the wide-angle end state when zooming from the wide-angle end state to the telephoto end state. The zoom lens according to one item. 前記第４レンズ群が、負の屈折力を有することを特徴とする請求項１から請求項４のうちの一項に記載のズームレンズ。   The zoom lens according to claim 1, wherein the fourth lens group has a negative refractive power. 前記第４レンズ群を像側に移動することで、無限遠から近接物体への合焦を行うことを特徴とする請求項１から請求項５のうちの一項に記載のズームレンズ。   6. The zoom lens according to claim 1, wherein focusing is performed from infinity to a close object by moving the fourth lens group to the image side. 前記第５レンズ群の像側に、正の屈折力を有する第６レンズ群を配置したことを特徴とする請求項１から請求項６のうちの一項に記載のズームレンズ。 Wherein the image side of the fifth lens group, a positive zoom lens according to one of one of claims 1 to 6, characterized in that the sixth lens group disposed having a refractive power. 請求項１から請求項７に記載のズームレンズの像側に、前記ズームレンズによって形成された光学像を電気的信号に変換する撮像素子を備えたことを特徴とする撮像装置。 On the image side of the zoom lens according to claims 1 to claim 7, imaging apparatus characterized by comprising an imaging device for converting an optical image formed by the zoom lens into an electrical signal.
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