JP2016045435A - Telephoto zoom lens with anti-shake capability - Google Patents
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- 230000006641 stabilisation Effects 0.000 description 32
- 238000011105 stabilization Methods 0.000 description 32
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Abstract
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本発明は、一眼レフカメラ等に好適な望遠ズームレンズに関するものである。 The present invention relates to a telephoto zoom lens suitable for a single-lens reflex camera or the like.
４倍程度の変倍比を有し、防振機能を有するズームレンズとして、以下に示す特許文献１、２、３が開示されている。
従来、広角端で３０度以上の画角を持つ変倍比４倍程度のズームレンズは、高い光学性能とコンパクト化を両立することが課題であった。 Conventionally, a zoom lens with a zoom ratio of about 4 times having an angle of view of 30 degrees or more at the wide-angle end has had a problem of achieving both high optical performance and downsizing.
特許文献１に開示された光学系は、正、負、正、負、正、負の６つのレンズ群を有し、強い負の屈折力を持つ第２群を光軸と垂直方向に移動させることで防振を行っている。しかし、第２群内に入射する軸上光線高が高く、径方向に関して十分な小型化が為されているとは言えない。
The optical system disclosed in
特許文献２に開示された光学系は、正、負、正、正の４つのレンズ群を有し、第１レンズ群全体を物体側に繰り出すことにより、無限遠から近距離への合焦を行う。しかし、フォーカス群の重量が大きく、高速な合焦動作を行うことができない。
The optical system disclosed in
特許文献３に開示された光学系は、正、負、正、正の４つのレンズ群を有し、第１レンズ群を２つの正成分に分割し、像側の正屈折力成分を物体側に繰り出すことにより、無限遠から近距離への合焦を行う。また第４レンズ群内を３つの群に分割し、中央の負屈折力成分を防振レンズ群として、防振レンズ群の有効径を下げるため、第４レンズ群の最も物体側に強い正屈折力成分を配置している。しかし、限られたスペースに強い屈折力を持つレンズ群を複数配置するため、第４レンズ群内の各群の収差補正負担が増え、製造誤差敏感度が高くなるという問題がある。 The optical system disclosed in Patent Document 3 has four lens groups, positive, negative, positive, and positive, the first lens group is divided into two positive components, and the positive refractive power component on the image side is the object side. Focusing from infinity to short distance is performed by moving out to. In addition, the fourth lens group is divided into three groups, and the central negative refractive power component is used as an anti-vibration lens group to reduce the effective diameter of the anti-vibration lens group. The force component is arranged. However, since a plurality of lens groups having a strong refractive power are arranged in a limited space, there is a problem in that the aberration correction burden of each group in the fourth lens group increases and the manufacturing error sensitivity increases.
本発明は、上記課題を解決し、高画素化の進んだ撮像素子を搭載したデジタル一眼レフカメラに好適なコンパクトで光学性能が良好な防振機能を有する望遠ズームレンズを提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a telephoto zoom lens that has a vibration-proof function that is compact and has good optical performance, suitable for a digital single-lens reflex camera equipped with an image sensor with an increased number of pixels. To do.
上記課題を解決するための手段である本発明は、物体側より順に、正屈折力の第１レンズ群と、正屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群と、負屈折力の第５レンズ群と、正屈折力の第６レンズ群と、負屈折力の第７レンズ群を有し、前記第３レンズ群を光軸と直交方向に移動させることにより、手振れ発生時の像面上の像ブレ補正を行い、前記第１レンズ群は物体側より順に、正屈折力の第１１レンズ群と、正屈折力の第１２レンズ群を有し、前記第１２レンズ群を物体側へ繰り出すことにより、無限遠から近距離への合焦を行い、以下の条件を満足することを特徴とする防振機能を有するズームレンズである。
（１）０．３０＜ｆ１２／ｆ１１＜０．６０
（２）０．２０＜｜ｆ３／ｆ１｜＜０．２３
（３）１．５０＜ｆ２／ｆ１２＜４．００
ただし、
ｆ１１：前記第１１レンズ群の焦点距離
ｆ１２：前記第１２レンズ群の焦点距離
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｆ３：前記第３レンズ群の焦点距離
The present invention, which is a means for solving the above-mentioned problems, comprises, in order from the object side, a first lens group having a positive refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, A fourth lens group having a refractive power; a fifth lens group having a negative refractive power; a sixth lens group having a positive refractive power; and a seventh lens group having a negative refractive power; and the third lens group as an optical axis. By moving in the orthogonal direction, image blur correction on the image plane at the time of occurrence of camera shake is performed, and the first lens group in order from the object side is an eleventh lens group having a positive refractive power and a twelfth lens having a positive refractive power. The zoom lens has a vibration-proof function, and has a group, and the twelfth lens group is extended toward the object side, thereby focusing from infinity to a short distance and satisfying the following conditions.
(1) 0.30 <f12 / f11 <0.60
(2) 0.20 <| f3 / f1 | <0.23
(3) 1.50 <f2 / f12 <4.00
However,
f11: focal length of the eleventh lens group f12: focal length of the twelfth lens group f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group
本発明によれば、高画素化の進んだ撮像素子を搭載したデジタル一眼レフカメラに好適なコンパクトで光学性能が良好な防振機能を有する望遠ズームレンズを提供することができる。 According to the present invention, it is possible to provide a telephoto zoom lens having an anti-vibration function that is compact and has good optical performance suitable for a digital single-lens reflex camera equipped with an image sensor with an increased number of pixels.
本発明の防振機能を有する望遠ズームレンズは、物体側から順に、正屈折力の第１レンズ群と、正屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群と、負屈折力の第５レンズ群と、正屈折力の第６レンズ群と、負屈折力の第７レンズ群を有し、前記第３レンズ群を光軸と直交方向に移動させることにより、手振れ発生時の像面上の像ブレ補正を行い、前記第１レンズ群は物体側より順に、正屈折力の第１１レンズ群と、正屈折力の第１２レンズ群を有し、前記第１２群を光軸と平行に移動することによって無限遠から近距離への合焦を行う構成となっている。 The telephoto zoom lens having an image stabilization function according to the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive refraction. A fourth lens group having a negative power, a fifth lens group having a negative refractive power, a sixth lens group having a positive refractive power, and a seventh lens group having a negative refractive power. The third lens group is orthogonal to the optical axis. By moving in the direction, image blur correction on the image plane at the time of occurrence of camera shake is performed, and the first lens group in order from the object side is an eleventh lens group having a positive refractive power and a twelfth lens group having a positive refractive power. And moving the twelfth group in parallel with the optical axis to focus from infinity to a short distance.
従来、４倍程度のズーム比を持つ写真用望遠ズームレンズとしては、正負正正の４群タイプが一般的であった。４群以下の望遠ズームレンズは、比較的簡易な機構をとることが可能であり、さらにレンズ構成枚数を最小化することで、携帯性に優れた製品とすることができる。 Conventionally, as a photographic telephoto zoom lens having a zoom ratio of about 4 times, a positive, negative, positive four group type has been generally used. A telephoto zoom lens of four groups or less can have a relatively simple mechanism, and can be a product with excellent portability by minimizing the number of lenses.
しかし、近年の一眼レフカメラの高画素化によって、交換レンズに対し、より高いレベルの性能が求められるようになっている。４群以下の望遠ズームレンズで高性能化を実現しようとすると、高度な収差補正を行うために各群のレンズ構成枚数を増やす必要が生じるが、製造誤差敏感度が大きくなり、安定的に製造を行うことが困難となる。 However, with the recent increase in the number of pixels in a single-lens reflex camera, a higher level of performance is required for an interchangeable lens. In order to achieve high performance with a telephoto zoom lens of 4 groups or less, it is necessary to increase the number of lenses in each group in order to perform advanced aberration correction. It becomes difficult to do.
そこで、本発明の結像光学系では、物体側から順に、正屈折力の第１レンズ群と、正屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群と、負屈折力の第５レンズ群と、正屈折力の第６レンズ群と、負屈折力の第７レンズ群を配置し、各群のパワー配置を適切に設定し、径方向のコンパクト化を達成すると共に、高性能化と製造誤差敏感度の低減を両立させた。 Therefore, in the imaging optical system of the present invention, in order from the object side, the first lens group having positive refractive power, the second lens group having positive refractive power, the third lens group having negative refractive power, and the positive lens having positive refractive power. The fourth lens group, the fifth lens group with negative refracting power, the sixth lens group with positive refracting power, and the seventh lens group with negative refracting power are arranged, the power arrangement of each group is appropriately set, and the diameter In addition to achieving compactness in the direction, both high performance and reduced manufacturing error sensitivity were achieved.
また、前記第１レンズ群は、物体側から順に、第１１レンズ群と、第１２レンズ群に分割し、前記第１２レンズ群を無限遠から近距離への合焦を行うためのフォーカス群とした。これにより、１群全体でフォーカスするときに比べ、フォーカス重量の軽量化が可能であり、且つフォーカス群の径を下げることができることから、鏡筒の大型化を防ぐことができる。また前記第１１レンズ群及び、第１２レンズ群それぞれに正屈折力の接合レンズを配置することで前記第１レンズ群内での収差発生、特に望遠端で問題になるコマ収差を極力抑えている。 The first lens group is divided into an eleventh lens group and a twelfth lens group in order from the object side, and the twelfth lens group is used as a focus group for focusing from infinity to a short distance. . Accordingly, the weight of the focus can be reduced and the diameter of the focus group can be reduced as compared with the case where the entire group is focused, so that the size of the lens barrel can be prevented from being increased. Further, by arranging a cemented lens having a positive refractive power in each of the eleventh lens group and the twelfth lens group, aberrations in the first lens group, particularly coma, which is a problem at the telephoto end, are suppressed as much as possible. .
また、負屈折力を持つ第３レンズ群を光軸と垂直方向に動かすことで手振れ発生時の像面上の像ブレ補正を行っているが、第３レンズ群よりも物体側に複数の正屈折力成分を配置することにより、第３レンズ群に入射する軸上光線高を十分に小さくすることができる。これにより、防振群の小型化が達成され、製品外径の小型化が可能になる。 In addition, image blur correction on the image plane at the time of camera shake is performed by moving the third lens group having negative refractive power in the direction perpendicular to the optical axis. By arranging the refractive power component, the height of the on-axis light beam incident on the third lens group can be made sufficiently small. As a result, the vibration-proof group can be reduced in size, and the product outer diameter can be reduced.
高性能化と製品外径の小型化の課題を解決するために、前記の構成をとった上で、本発明の結像光学系では、以下の条件式を満足することが望ましい。
（１）０．３０＜ｆ１２／ｆ１１＜０．６０
（２）０．２０＜｜ｆ３／ｆ１｜＜０．２３
（３）１．５０＜ｆ２／ｆ１２＜４．００
ｆ１１：前記第１１レンズ群の焦点距離
ｆ１２：前記第１２レンズ群の焦点距離
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｆ３：前記第３レンズ群の焦点距離
In order to solve the problems of high performance and reduction in the outer diameter of the product, it is desirable that the imaging optical system of the present invention satisfies the following conditional expression after taking the above-described configuration.
(1) 0.30 <f12 / f11 <0.60
(2) 0.20 <| f3 / f1 | <0.23
(3) 1.50 <f2 / f12 <4.00
f11: focal length of the eleventh lens group f12: focal length of the twelfth lens group f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group
条件式（１）は、製品外径の小型化と高性能化を両立するために、前記第１１レンズ群の焦点距離ｆ１１と前記第１２レンズ群の焦点距離ｆ１２の適切な比率を規定するものである。 Conditional expression (1) defines an appropriate ratio between the focal length f11 of the eleventh lens group and the focal length f12 of the twelfth lens group in order to achieve both a reduction in the outer diameter of the product and a higher performance. It is.
条件式（１）の下限値を超え、前記第１１レンズ群の正屈折力が相対的に弱くなると、フォーカス群である前記第１２レンズ群に入射する軸上光線高を十分に下げることができない。そのためフォーカス群近辺のレンズの外径が大きくなり、フォーカス重量も増える。また前記第１２レンズ群の正屈折力が強くなりすぎると、製造誤差敏感度が高くなり好ましくない。 If the lower limit of conditional expression (1) is exceeded and the positive refractive power of the eleventh lens group becomes relatively weak, the height of the on-axis light beam incident on the twelfth lens group that is the focus group cannot be lowered sufficiently. . Therefore, the outer diameter of the lens in the vicinity of the focus group increases, and the focus weight also increases. If the positive refractive power of the twelfth lens group becomes too strong, the sensitivity of manufacturing error increases, which is not preferable.
条件式（１）の上限値を超え、前記第１１レンズ群の正屈折力が強くなると、適切な屈折力配置に対して第１レンズ群内の主点が物体側に移動する。このとき広角端において第１レンズ群と第２レンズ群との間隔を十分に確保することが困難となる。 When the upper limit of conditional expression (1) is exceeded and the positive refractive power of the eleventh lens group becomes strong, the principal point in the first lens group moves toward the object side with respect to an appropriate refractive power arrangement. At this time, it is difficult to ensure a sufficient distance between the first lens group and the second lens group at the wide angle end.
なお、条件式（１）について、その下限値をさらに０．３５に、また、上限値をさらに０．５５とすることで、前述の効果をより確実にすることができる。 In addition, regarding the conditional expression (1), the lower limit value is further set to 0.35 and the upper limit value is further set to 0.55, whereby the above-described effect can be further ensured.
条件式（２）は、手振れ補正のために必要となる適切な防振敏感度を得るために、前記第１レンズ群と前記第３レンズ群の焦点距離の比率の絶対値を規定するものである。 Conditional expression (2) defines the absolute value of the ratio of the focal lengths of the first lens group and the third lens group in order to obtain an appropriate anti-shake sensitivity necessary for camera shake correction. is there.
条件式（２）の下限値を超えて、第１レンズ群の正屈折力に対し、第３レンズ群の負屈折力が強くなると、防振敏感度は大きくなり、防振のために必要な光軸と垂直な方向の移動量は小さくなり、レンズ外径のコンパクト化が可能になる。しかし、防振群の製造誤差敏感度や光軸方向の位置ズレによるピント移動が大きくなってしまう。また、第３レンズ群の焦点距離を適切に保った上で、第１レンズ群の焦点距離が長くなると、広角端から望遠端へのズーミングに際して第１レンズ群の移動量が大きくなり十分な小型化が困難になる。 If the negative refractive power of the third lens unit becomes stronger than the positive refractive power of the first lens unit beyond the lower limit value of conditional expression (2), the anti-vibration sensitivity increases, which is necessary for anti-vibration. The amount of movement in the direction perpendicular to the optical axis is reduced, and the lens outer diameter can be made compact. However, the focus movement due to the manufacturing error sensitivity of the vibration isolation group and the positional deviation in the optical axis direction becomes large. Further, when the focal length of the first lens group is increased while the focal length of the third lens group is appropriately maintained, the amount of movement of the first lens group is increased during zooming from the wide-angle end to the telephoto end. It becomes difficult.
条件式（２）の上限値を超えて、第１レンズ群の正屈折力に対し、第３レンズ群の負屈折力が弱くなると、防振敏感度は小さくなり、防振のために必要な光軸と垂直な方向の移動量が大きくなる。そのため、防振ユニットが大きくなり鏡筒が大型化する。また、第３レンズ群の焦点距離を適切に保ったうえで、第１レンズ群の焦点距離が短くなると、第１レンズ群の製造誤差敏感度が大きくなり、安定して製造を行うことが困難となる。 When the upper limit of conditional expression (2) is exceeded and the negative refractive power of the third lens group becomes weaker than the positive refractive power of the first lens group, the anti-shake sensitivity decreases, which is necessary for anti-shake. The amount of movement in the direction perpendicular to the optical axis increases. As a result, the vibration isolation unit becomes larger and the lens barrel becomes larger. In addition, when the focal length of the first lens group is shortened while keeping the focal length of the third lens group appropriately, the sensitivity of manufacturing error of the first lens group increases, and it is difficult to perform stable manufacturing. It becomes.
条件式（３）は、防振群である第３レンズ群に入射する軸上光線高を下げるための適切な第１２レンズ群と第２レンズ群の焦点距離の比率を規定するものである。 Conditional expression (3) defines an appropriate ratio of the focal lengths of the twelfth lens group and the second lens group for reducing the height of the on-axis light beam incident on the third lens group that is the image stabilizing group.
条件式（３）の下限値を超えて、第１２レンズ群に対し、第２レンズ群の正屈折力が強くなると、第２レンズ群で発生する収差が大きくなり、第２レンズ群での収差補正のためレンズ枚数が増加する。 When the lower limit of conditional expression (3) is exceeded and the positive refractive power of the second lens group becomes stronger with respect to the twelfth lens group, the aberration generated in the second lens group becomes larger, and the aberration in the second lens group. The number of lenses increases for correction.
条件式（３）の上限値を超えて、第１２レンズ群に対し、第２レンズ群の正屈折力が弱くなると、第２レンズ群での光線収束効果が小さくなり、第３レンズ群に入射する軸上光線高を十分に下げることができない。 When the upper limit of conditional expression (3) is exceeded and the positive refractive power of the second lens group becomes weaker with respect to the twelfth lens group, the light beam convergence effect in the second lens group becomes smaller, and the light enters the third lens group. The on-axis beam height cannot be lowered sufficiently.
なお、条件式（３）について、その下限値をさらに２．００に、また、上限値をさらに３．５０とすることで、前述の効果をより確実にすることができる。 Regarding conditional expression (3), the lower limit value is further set to 2.00, and the upper limit value is further set to 3.50, whereby the above-described effect can be further ensured.
次に、本発明の光学系に係る実施例のレンズ構成について説明する。なお、以下の説明ではレンズ構成を物体側から像面側の順番で記載する。 Next, a lens configuration of an example according to the optical system of the present invention will be described. In the following description, lens configurations are described in order from the object side to the image plane side.
図１は本発明の実施例１にかかる防振機能を有するズームレンズのレンズ構成図である。 FIG. 1 is a lens configuration diagram of a zoom lens having an image stabilization function according to Example 1 of the present invention.
図１において、防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、正の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正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、負の屈折力を有する第７レンズ群Ｇ７から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群は物体側へ移動し、第２レンズ群は固定し、第３レンズ群は物体側へ移動し、第４レンズ群は物体側へ移動し、第５レンズ群は固定し、第６レンズ群は物体側へ移動し、第７レンズ群は物体側へ移動する構成となっている。 In FIG. 1, a zoom lens having an anti-vibration function has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a negative refractive power. Third lens group G3, fourth lens group G4 having positive refractive power, fifth lens group G5 having negative refractive power, sixth lens group G6 having positive refractive power, and negative refractive power The first lens group moves to the object side, the second lens group is fixed, and the second lens group is fixed, when zooming from the wide-angle end state (W) to the telephoto end state (T). The third lens group moves to the object side, the fourth lens group moves to the object side, the fifth lens group is fixed, the sixth lens group moves to the object side, and the seventh lens group moves to the object side. It has a configuration.
第１レンズ群Ｇ１は、物体側から順に、正の屈折力を有する第１１レンズ群Ｇ１１と正の屈折力を有する第１２レンズ群Ｇ１２からなり、第１１レンズ群Ｇ１１は物体側から順に、物体側に凸面を向けた負メニスカスレンズと正メニスカスレンズの接合レンズからなり、第１２レンズ群Ｇ１２は物体側から順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズの接合レンズからなる。 The first lens group G1 includes, in order from the object side, an eleventh lens group G11 having a positive refractive power and a twelfth lens group G12 having a positive refractive power. The eleventh lens group G11 is an object in order from the object side. A negative meniscus lens having a convex surface facing the side and a positive meniscus lens cemented lens. The twelfth lens group G12 is a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens in order from the object side. Consists of.
第２レンズ群Ｇ２は、像面側に凸面を向けた平凸形状の正レンズからなる。 The second lens group G2 is composed of a planoconvex positive lens having a convex surface directed toward the image surface side.
第３レンズ群Ｇ３は、物体側から順に、両凹形状の負レンズと、両凹形状の負レンズと物体側に凸面を向けた正メニスカスレンズの接合レンズからなる。 The third lens group G3 includes, in order from the object side, a cemented lens of a biconcave negative lens, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
第４レンズ群Ｇ４は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと両凹形状の負レンズの接合レンズからなる。 The fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a convex surface directed toward the image surface side, and a cemented lens of a biconvex positive lens and a biconcave negative lens.
第５レンズ群Ｇ５は、物体側から順に、両凹形状の負レンズと、両凸形状の正レンズの接合レンズからなる。 The fifth lens group G5 includes, in order from the object side, a cemented lens of a biconcave negative lens and a biconvex positive lens.
第６レンズ群Ｇ６は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと像面側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The sixth lens group G6 includes, in order from the object side, a positive meniscus lens having a convex surface facing the image surface, a biconvex positive lens, a negative meniscus lens having a convex surface facing the image surface, and a convex surface facing the object side. It consists of a positive meniscus lens.
第７レンズ群Ｇ７は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと、両凹形状の負レンズと、両凸形状の正レンズからなる。 The seventh lens group G7 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconvex positive lens, a biconcave negative lens, and a biconvex positive lens.
開口絞りＳは第４レンズ群Ｇ４の最も像側に配置され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と共に移動する。 The aperture stop S is disposed closest to the image side of the fourth lens group G4, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state (W) to the telephoto end state (T).
手振れ発生時には、第３レンズ群を光軸と直交方向に移動させることにより、像面上の像ぶれ補正を行う。 When camera shake occurs, image blur correction on the image plane is performed by moving the third lens group in a direction orthogonal to the optical axis.
無限遠から近距離へのフォーカシングは、第１２レンズ群Ｇ１２を物体方向に移動させて行う。 Focusing from infinity to short distance is performed by moving the twelfth lens group G12 in the object direction.
図４は、実施例１にかかる防振機能を有するズームレンズの広角端状態での無限遠状態において０．３°の回転ぶれに対するぶれ補正をおこなった時のメリジオナル横収差図を示す。図９は実施例１にかかる防振機能を有するズームレンズの望遠端状態での無限遠状態において０．１５°の回転ぶれに対するぶれ補正を行った時のメリジオナル横収差図を示す。 FIG. 4 is a meridional lateral aberration diagram in the case where the zoom lens having the image stabilization function according to the example 1 is subjected to the shake correction with respect to the rotational shake of 0.3 ° in the infinite state at the wide angle end state. FIG. 9 is a meridional lateral aberration diagram in the case where the zoom lens having the image stabilization function according to Example 1 is subjected to the shake correction for the rotational shake of 0.15 ° in the infinite state at the telephoto end state.
なお、全系の焦点距離がｆで、防振係数（ぶれ補正での移動レンズ群の移動量に対する結像面での像移動量の比）がＫのレンズで角度θの回転ぶれを補正するには、ぶれ補正用の移動レンズ群を（ｆ・ｔａｎθ）／Ｋだけ光軸と直交方向に移動させればよい。本関係は以降の他の実施例についても同様であり説明を省略する。 It should be noted that the focal length of the entire system is f, and the image blur correction coefficient (ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) corrects rotational shake at an angle θ with a K lens. For this, the moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. This relationship is the same for the other embodiments described below, and a description thereof will be omitted.
また、防振レンズ群の倍率をβｏｓ、防振レンズ群より像側のレンズ群の倍率をβｒｅａｒとすると、一般に防振係数Ｋｏｓは下記の式で表わされる。
Ｋｏｓ＝Δｉｍｇ／Δｘ＝βｒｅａｒ×（１−βｏｓ）
Δｉｍｇ：結像面における像の移動量
Δｘ：防振レンズ群の移動量
一般にＫｏｓが小さいと必要な手振れ補正角を得るために必要な防振レンズ群の移動量が大きくなり、防振レンズユニットの径が大きくなり、レンズ外径の大型化を招く。本関係は以降の他の実施例についても同様であり説明を省略する。
If the magnification of the image stabilizing lens group is βos and the magnification of the lens group on the image side of the image stabilizing lens group is βrear, the image stabilization coefficient Kos is generally expressed by the following equation.
Kos = Δimg / Δx = βrear × (1−βos)
Δimg: Amount of image movement on the imaging plane Δx: Amount of movement of the image stabilizing lens group In general, when Kos is small, the amount of movement of the image stabilizing lens group required to obtain a necessary image stabilization angle increases, and the image stabilizing lens unit This increases the diameter of the lens, leading to an increase in the outer diameter of the lens. This relationship is the same for the other embodiments described below, and a description thereof will be omitted.
実施例１の広角端状態（Ｗ）においては、防振係数は−２．１０であり、焦点距離は７２．０６（ｍｍ）であるので、０．３０°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１８ｍｍである。また望遠端状態（Ｔ）においては、防振係数は−４．４１であり、焦点距離は２８９．９９（ｍｍ）であるので、０．１５°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１７（ｍｍ）である。 In the wide-angle end state (W) of the first embodiment, the image stabilization coefficient is −2.10 and the focal length is 72.06 (mm). Therefore, the first correction for correcting the rotation blur of 0.30 ° is performed. The moving amount of the three lens group G3 is 0.18 mm. In the telephoto end state (T), since the image stabilization coefficient is −4.41 and the focal length is 289.99 (mm), the third lens group for correcting the rotational blur of 0.15 °. The moving amount of G3 is 0.17 (mm).
図１０は本発明の実施例２にかかる防振機能を有するズームレンズのレンズ構成図である。 FIG. 10 is a lens configuration diagram of a zoom lens having an image stabilization function according to Example 2 of the present invention.
図１０において、防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、正の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正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、負の屈折力を有する第７レンズ群Ｇ７から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群は物体側へ移動し、第２レンズ群は固定し、第３レンズ群は物体側へ移動し、第４レンズ群は物体側へ移動し、第５レンズ群は初めに物体側に移動し、その後、像面側に移動し、第６レンズ群は物体側へ移動し、第７レンズ群は物体側へ移動する構成となっている。 In FIG. 10, the zoom lens having an anti-vibration function has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a negative refractive power. Third lens group G3, fourth lens group G4 having positive refractive power, fifth lens group G5 having negative refractive power, sixth lens group G6 having positive refractive power, and negative refractive power The first lens group moves to the object side, the second lens group is fixed, and the second lens group is fixed, when zooming from the wide-angle end state (W) to the telephoto end state (T). The third lens group moves to the object side, the fourth lens group moves to the object side, the fifth lens group first moves to the object side, and then moves to the image plane side, and the sixth lens group moves to the object side. The seventh lens group is configured to move to the object side.
第１レンズ群Ｇ１は、物体側から順に、正の屈折力を有する第１１レンズ群Ｇ１１と正の屈折力を有する第１２レンズ群Ｇ１２からなり、第１１レンズ群Ｇ１１は物体側から順に、物体側に凸面を向けた負メニスカスレンズと正メニスカスレンズの接合レンズからなり、第１２レンズ群Ｇ１２は物体側から順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズの接合レンズからなる。 The first lens group G1 includes, in order from the object side, an eleventh lens group G11 having a positive refractive power and a twelfth lens group G12 having a positive refractive power. The eleventh lens group G11 is an object in order from the object side. A negative meniscus lens having a convex surface facing the side and a positive meniscus lens cemented lens. The twelfth lens group G12 is a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens in order from the object side. Consists of.
第２レンズ群Ｇ２は、像面側に凸面を向けた平凸形状の正レンズからなる。 The second lens group G2 is composed of a planoconvex positive lens having a convex surface directed toward the image surface side.
第３レンズ群Ｇ３は、物体側から順に、両凹形状の負レンズと、両凹形状の負レンズと物体側に凸面を向けた正メニスカスレンズの接合レンズからなる。 The third lens group G3 includes, in order from the object side, a cemented lens of a biconcave negative lens, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
第４レンズ群Ｇ４は、物体側から順に、両凸形状の正レンズと、両凸形状の正レンズと両凹形状の負レンズの接合レンズからなる。 The fourth lens group G4 includes, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens.
第５レンズ群Ｇ５は、物体側から順に、両凹形状の負レンズと、両凸形状の正レンズの接合レンズからなる。 The fifth lens group G5 includes, in order from the object side, a cemented lens of a biconcave negative lens and a biconvex positive lens.
第６レンズ群Ｇ６は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと像面側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The sixth lens group G6 includes, in order from the object side, a positive meniscus lens having a convex surface facing the image surface, a biconvex positive lens, a negative meniscus lens having a convex surface facing the image surface, and a convex surface facing the object side. It consists of a positive meniscus lens.
第７レンズ群Ｇ７は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと、両凹形状の負レンズと、両凸形状の正レンズからなる。 The seventh lens group G7 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconvex positive lens, a biconcave negative lens, and a biconvex positive lens.
開口絞りＳは第４レンズ群Ｇ４の最も像側に配置され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と共に移動する。 The aperture stop S is disposed closest to the image side of the fourth lens group G4, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state (W) to the telephoto end state (T).
手振れ発生時には、第３レンズ群を光軸と直交方向に移動させることにより、像面上の像ぶれ補正を行う。 When camera shake occurs, image blur correction on the image plane is performed by moving the third lens group in a direction orthogonal to the optical axis.
無限遠から近距離へのフォーカシングは、第１２レンズ群Ｇ１２を物体方向に移動させて行う。 Focusing from infinity to short distance is performed by moving the twelfth lens group G12 in the object direction.
図１３は、実施例２にかかる防振機能を有するズームレンズの広角端状態での無限遠状態において０．３°の回転ぶれに対するぶれ補正をおこなった時のメリジオナル横収差図を示す。図１８は実施例２にかかる防振機能を有するズームレンズの望遠端状態での無限遠状態において０．１５°の回転ぶれに対するぶれ補正を行った時のメリジオナル横収差図を示す。 FIG. 13 is a meridional lateral aberration diagram in the case where the zoom lens having the image stabilization function according to the second embodiment is corrected for the shake of 0.3 ° in the infinite state at the wide-angle end state. FIG. 18 is a meridional lateral aberration diagram when the blur correction is performed for the rotational blur of 0.15 ° in the infinite state at the telephoto end state of the zoom lens having the image stabilization function according to the second example.
実施例２の広角端状態（Ｗ）においては、防振係数は−２．２１であり、焦点距離は７２．１３（ｍｍ）であるので、０．３０°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１７ｍｍである。また望遠端状態（Ｔ）においては、防振係数は−４．５４であり、焦点距離は２９０．００（ｍｍ）であるので、０．１５°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１７（ｍｍ）である。 In the wide-angle end state (W) of the second embodiment, the image stabilization coefficient is −2.21 and the focal length is 72.13 (mm). Therefore, the first correction for correcting the rotation blur of 0.30 ° is performed. The moving amount of the three lens group G3 is 0.17 mm. In the telephoto end state (T), since the image stabilization coefficient is −4.54 and the focal length is 290.00 (mm), the third lens group for correcting the rotational blur of 0.15 °. The moving amount of G3 is 0.17 (mm).
図１９は本発明の実施例３にかかる防振機能を有するズームレンズのレンズ構成図である。 FIG. 19 is a lens configuration diagram of a zoom lens having an image stabilization function according to Example 3 of the present invention.
図１９において、防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、正の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正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、負の屈折力を有する第７レンズ群Ｇ７から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群は物体側へ移動し、第２レンズ群は固定し、第３レンズ群は物体側へ移動し、第４レンズ群は物体側へ移動し、第５レンズ群は固定し、第６レンズ群は物体側へ移動し、第７レンズ群は物体側へ移動する構成となっている。 In FIG. 19, the zoom lens having the image stabilization function has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a negative refractive power. Third lens group G3, fourth lens group G4 having positive refractive power, fifth lens group G5 having negative refractive power, sixth lens group G6 having positive refractive power, and negative refractive power The first lens group moves to the object side, the second lens group is fixed, and the second lens group is fixed, when zooming from the wide-angle end state (W) to the telephoto end state (T). The third lens group moves to the object side, the fourth lens group moves to the object side, the fifth lens group is fixed, the sixth lens group moves to the object side, and the seventh lens group moves to the object side. It has a configuration.
第１レンズ群Ｇ１は、物体側から順に、正の屈折力を有する第１１レンズ群Ｇ１１と正の屈折力を有する第１２レンズ群Ｇ１２からなり、第１１レンズ群Ｇ１１は物体側から順に、物体側に凸面を向けた負メニスカスレンズと正メニスカスレンズの接合レンズからなり、第１２レンズ群Ｇ１２は物体側から順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズの接合レンズからなる。 The first lens group G1 includes, in order from the object side, an eleventh lens group G11 having a positive refractive power and a twelfth lens group G12 having a positive refractive power. The eleventh lens group G11 is an object in order from the object side. A negative meniscus lens having a convex surface facing the side and a positive meniscus lens cemented lens. The twelfth lens group G12 is a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens in order from the object side. Consists of.
第２レンズ群Ｇ２は、像面側に凸面を向けた平凸形状の正レンズからなる。 The second lens group G2 is composed of a planoconvex positive lens having a convex surface directed toward the image surface side.
第３レンズ群Ｇ３は、物体側から順に、両凹形状の負レンズと、両凹形状の負レンズと物体側に凸面を向けた正メニスカスレンズの接合レンズからなる。 The third lens group G3 includes, in order from the object side, a cemented lens of a biconcave negative lens, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
第４レンズ群Ｇ４は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと両凹レンズの接合レンズからなる。 The fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a convex surface directed toward the image surface side, and a cemented lens of a biconvex positive lens and a biconcave lens.
第５レンズ群Ｇ５は、物体側から順に、両凹形状の負レンズと、両凸形状の正レンズの接合レンズからなる。 The fifth lens group G5 includes, in order from the object side, a cemented lens of a biconcave negative lens and a biconvex positive lens.
第６レンズ群Ｇ６は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと像面側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The sixth lens group G6 includes, in order from the object side, a positive meniscus lens having a convex surface facing the image surface, a biconvex positive lens, a negative meniscus lens having a convex surface facing the image surface, and a convex surface facing the object side. It consists of a positive meniscus lens.
第７レンズ群Ｇ７は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと、両凹形状の負レンズと、両凸形状の正レンズからなる。 The seventh lens group G7 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconvex positive lens, a biconcave negative lens, and a biconvex positive lens.
開口絞りＳは第４レンズ群Ｇ４の最も像側に配置され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と共に移動する。 The aperture stop S is disposed closest to the image side of the fourth lens group G4, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state (W) to the telephoto end state (T).
手振れ発生時には、第３レンズ群を光軸と直交方向に移動させることにより、像面上の像ぶれ補正を行う。 When camera shake occurs, image blur correction on the image plane is performed by moving the third lens group in a direction orthogonal to the optical axis.
無限遠から近距離へのフォーカシングは、第１２レンズ群Ｇ１２を物体方向に移動させて行う。 Focusing from infinity to short distance is performed by moving the twelfth lens group G12 in the object direction.
図２２は、実施例３にかかる防振機能を有するズームレンズの広角端状態での無限遠状態において０．３°の回転ぶれに対するぶれ補正をおこなった時のメリジオナル横収差図を示す。図２７は実施例３にかかる防振機能を有するズームレンズの望遠端状態での無限遠状態において０．１５°の回転ぶれに対するぶれ補正を行った時のメリジオナル横収差図を示す。 FIG. 22 is a meridional lateral aberration diagram in the case where the zoom lens having the image stabilization function according to the third embodiment is subjected to the blur correction for the 0.3 ° rotational blur in the infinite state at the wide angle end state. FIG. 27 is a meridional lateral aberration diagram when the blur correction is performed for the rotational blur of 0.15 ° in the infinity state at the telephoto end state of the zoom lens having the image stabilization function according to the third example.
実施例３の広角端状態（Ｗ）においては、防振係数は−２．０３であり、焦点距離は７２．０６（ｍｍ）であるので、０．３０°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１９ｍｍである。また望遠端状態（Ｔ）においては、防振係数は−４．２０であり、焦点距離は２８９．９９（ｍｍ）であるので、０．１５°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１８（ｍｍ）である。 In the wide-angle end state (W) of the third embodiment, the image stabilization coefficient is −2.03 and the focal length is 72.06 (mm). Therefore, the first correction for correcting the rotation blur of 0.30 ° is performed. The moving amount of the three lens group G3 is 0.19 mm. In the telephoto end state (T), since the image stabilization coefficient is −4.20 and the focal length is 289.99 (mm), the third lens group for correcting the rotational blur of 0.15 °. The moving amount of G3 is 0.18 (mm).
図２８は本発明の実施例４にかかる防振機能を有するズームレンズのレンズ構成図である。 FIG. 28 is a lens configuration diagram of a zoom lens having an image stabilization function according to Example 4 of the present invention.
図２８において、防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、正の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正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、負の屈折力を有する第７レンズ群Ｇ７から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群は物体側へ移動し、第２レンズ群は固定し、第３レンズ群は初めに物体側に移動し、その後、像面側へ移動し、第４レンズ群は物体側へ移動し、第５レンズ群は固定し、第６レンズ群は物体側へ移動し、第７レンズ群は物体側へ移動する構成となっている。 In FIG. 28, the zoom lens having the image stabilization function has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a negative refractive power. Third lens group G3, fourth lens group G4 having positive refractive power, fifth lens group G5 having negative refractive power, sixth lens group G6 having positive refractive power, and negative refractive power The first lens group moves to the object side, the second lens group is fixed, and the second lens group is fixed, when zooming from the wide-angle end state (W) to the telephoto end state (T). The three lens groups first move to the object side, then move to the image plane side, the fourth lens group moves to the object side, the fifth lens group is fixed, and the sixth lens group moves to the object side. The seventh lens group is configured to move toward the object side.
第１レンズ群Ｇ１は、物体側から順に、正の屈折力を有する第１１レンズ群Ｇ１１と正の屈折力を有する第１２レンズ群Ｇ１２からなり、第１１レンズ群Ｇ１１は物体側から順に、物体側に凸面を向けた負メニスカスレンズと正メニスカスレンズの接合レンズからなり、第１２レンズ群Ｇ１２は物体側から順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズの接合レンズからなる。 The first lens group G1 includes, in order from the object side, an eleventh lens group G11 having a positive refractive power and a twelfth lens group G12 having a positive refractive power. The eleventh lens group G11 is an object in order from the object side. A negative meniscus lens having a convex surface facing the side and a cemented lens having a positive meniscus lens. The twelfth lens group G12 is a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens in order from the object side. Consists of.
第２レンズ群Ｇ２は、像面側に凸面を向けた平凸形状の正レンズからなる。 The second lens group G2 is composed of a planoconvex positive lens having a convex surface directed toward the image surface side.
第３レンズ群Ｇ３は、物体側から順に、両凹形状の負レンズと、両凹形状の負レンズと物体側に凸面を向けた正メニスカスレンズの接合レンズからなる。 The third lens group G3 includes, in order from the object side, a cemented lens of a biconcave negative lens, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
第４レンズ群Ｇ４は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと両凹レンズの接合レンズからなる。 The fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a convex surface directed toward the image surface side, and a cemented lens of a biconvex positive lens and a biconcave lens.
第５レンズ群Ｇ５は、物体側から順に、両凹形状の負レンズと、両凸形状の正レンズの接合レンズからなる。 The fifth lens group G5 includes, in order from the object side, a cemented lens of a biconcave negative lens and a biconvex positive lens.
第６レンズ群Ｇ６は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと像面側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The sixth lens group G6 includes, in order from the object side, a positive meniscus lens having a convex surface facing the image surface, a biconvex positive lens, a negative meniscus lens having a convex surface facing the image surface, and a convex surface facing the object side. It consists of a positive meniscus lens.
第７レンズ群Ｇ７は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと、両凹形状の負レンズと両凸形状の正レンズの接合レンズからなる。 The seventh lens group G7 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconvex positive lens, and a cemented lens of a biconcave negative lens and a biconvex positive lens. .
開口絞りＳは第４レンズ群Ｇ４の最も像側に配置され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と共に移動する。 The aperture stop S is disposed closest to the image side of the fourth lens group G4, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state (W) to the telephoto end state (T).
手振れ発生時には、第３レンズ群を光軸と直交方向に移動させることにより、像面上の像ぶれ補正を行う。 When camera shake occurs, image blur correction on the image plane is performed by moving the third lens group in a direction orthogonal to the optical axis.
無限遠から近距離へのフォーカシングは、第１２レンズ群Ｇ１２を物体方向に移動させて行う。 Focusing from infinity to short distance is performed by moving the twelfth lens group G12 in the object direction.
図３１は、実施例４にかかる防振機能を有するズームレンズの広角端状態での無限遠状態において０．３°の回転ぶれに対するぶれ補正をおこなった時のメリジオナル横収差図を示す。図３６は実施例４にかかる防振機能を有するズームレンズの望遠端状態での無限遠状態において０．１５°の回転ぶれに対するぶれ補正を行った時のメリジオナル横収差図を示す。 FIG. 31 is a meridional lateral aberration diagram in the case where the zoom lens having the image stabilization function according to Example 4 is subjected to the shake correction with respect to the rotational shake of 0.3 ° in the infinite state at the wide angle end state. FIG. 36 is a meridional lateral aberration diagram when the blur correction is performed with respect to the rotational blur of 0.15 ° in the infinity state at the telephoto end state of the zoom lens having the image stabilization function according to the fourth example.
実施例４の広角端状態（Ｗ）においては、防振係数は−２．１４であり、焦点距離は７２．０６（ｍｍ）であるので、０．３０°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１８ｍｍである。また望遠端状態（Ｔ）においては、防振係数は−４．４６であり、焦点距離は２９０．００（ｍｍ）であるので、０．１５°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１７（ｍｍ）である。 In the wide-angle end state (W) of the fourth embodiment, the image stabilization coefficient is −2.14 and the focal length is 72.06 (mm). Therefore, the first correction for correcting the rotational blur of 0.30 ° is performed. The moving amount of the three lens group G3 is 0.18 mm. In the telephoto end state (T), since the image stabilization coefficient is −4.46 and the focal length is 290.00 (mm), the third lens group for correcting the rotational blur of 0.15 °. The moving amount of G3 is 0.17 (mm).
図３７は本発明の実施例５にかかる防振機能を有するズームレンズのレンズ構成図である。 FIG. 37 is a lens configuration diagram of a zoom lens having an image stabilization function according to Example 5 of the present invention.
図３７において、防振機能を有するズームレンズは、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、正の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正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、負の屈折力を有する第７レンズ群Ｇ７から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群は物体側へ移動し、第２レンズ群は固定し、第３レンズ群は像側に移動し、第４レンズ群は物体側へ移動し、第５レンズ群は固定し、第６レンズ群は物体側へ移動し、第７レンズ群は物体側へ移動する構成となっている。 In FIG. 37, the zoom lens having the image stabilization function has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a negative refractive power. Third lens group G3, fourth lens group G4 having positive refractive power, fifth lens group G5 having negative refractive power, sixth lens group G6 having positive refractive power, and negative refractive power The first lens group moves to the object side, the second lens group is fixed, and the second lens group is fixed, when zooming from the wide-angle end state (W) to the telephoto end state (T). The third lens group moves to the image side, the fourth lens group moves to the object side, the fifth lens group is fixed, the sixth lens group moves to the object side, and the seventh lens group moves to the object side. It has a configuration.
第１レンズ群Ｇ１は、物体側から順に、正の屈折力を有する第１１レンズ群Ｇ１１と正の屈折力を有する第１２レンズ群Ｇ１２からなり、第１１レンズ群Ｇ１１は物体側から順に、物体側に凸面を向けた負メニスカスレンズと正メニスカスレンズの接合レンズからなり、第１２レンズ群Ｇ１２は物体側から順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズの接合レンズからなる。 The first lens group G1 includes, in order from the object side, an eleventh lens group G11 having a positive refractive power and a twelfth lens group G12 having a positive refractive power. The eleventh lens group G11 is an object in order from the object side. A negative meniscus lens having a convex surface facing the side and a positive meniscus lens cemented lens. The twelfth lens group G12 is a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens in order from the object side. Consists of.
第２レンズ群Ｇ２は、像面側に凸面を向けた平凸形状の正レンズからなる。 The second lens group G2 is composed of a planoconvex positive lens having a convex surface directed toward the image surface side.
第３レンズ群Ｇ３は、物体側から順に、両凹形状の負レンズと、両凹形状の負レンズと物体側に凸面を向けた正メニスカスレンズの接合レンズからなる。 The third lens group G3 includes, in order from the object side, a cemented lens of a biconcave negative lens, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
第４レンズ群Ｇ４は、物体側から順に、両凸形状の正レンズと、両凸形状の正レンズと両凹レンズの接合レンズからなる。 The fourth lens group G4 includes, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave lens.
第５レンズ群Ｇ５は、物体側から順に、両凹形状の負レンズと、両凸形状の正レンズの接合レンズからなる。 The fifth lens group G5 includes, in order from the object side, a cemented lens of a biconcave negative lens and a biconvex positive lens.
第６レンズ群Ｇ６は、物体側から順に、像面側に凸面を向けた正メニスカスレンズと、両凸形状の正レンズと像面側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The sixth lens group G6 includes, in order from the object side, a positive meniscus lens having a convex surface facing the image surface, a biconvex positive lens, a negative meniscus lens having a convex surface facing the image surface, and a convex surface facing the object side. It consists of a positive meniscus lens.
第７レンズ群Ｇ７は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと、両凹形状の負レンズと、両凸形状の正レンズからなる。 The seventh lens group G7 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconvex positive lens, a biconcave negative lens, and a biconvex positive lens.
開口絞りＳは第４レンズ群Ｇ４の最も像側に配置され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と共に移動する。 The aperture stop S is disposed closest to the image side of the fourth lens group G4, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state (W) to the telephoto end state (T).
手振れ発生時には、第３レンズ群を光軸と直交方向に移動させることにより、像面上の像ぶれ補正を行う。 When camera shake occurs, image blur correction on the image plane is performed by moving the third lens group in a direction orthogonal to the optical axis.
無限遠から近距離へのフォーカシングは、第１２レンズ群Ｇ１２を物体方向に移動させて行う。 Focusing from infinity to short distance is performed by moving the twelfth lens group G12 in the object direction.
図４０は、実施例５にかかる防振機能を有するズームレンズの広角端状態での無限遠状態において０．３°の回転ぶれに対するぶれ補正をおこなった時のメリジオナル横収差図を示す。図４５は実施例５にかかる防振機能を有するズームレンズの望遠端状態での無限遠状態において０．１５°の回転ぶれに対するぶれ補正を行った時のメリジオナル横収差図を示す。 FIG. 40 is a meridional lateral aberration diagram in the case where the zoom lens having the image stabilization function according to Example 5 is subjected to the blur correction for the 0.3 ° rotational blur in the infinite state at the wide angle end state. FIG. 45 is a meridional lateral aberration diagram when a shake correction is performed for a rotational shake of 0.15 ° in the infinity state at the telephoto end state of the zoom lens having the image stabilization function according to the fifth example.
実施例５の広角端状態（Ｗ）においては、防振係数は−２．１２であり、焦点距離は７２．０６（ｍｍ）であるので、０．３０°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１８ｍｍである。また望遠端状態（Ｔ）においては、防振係数は−４．３２であり、焦点距離は２９０．００（ｍｍ）であるので、０．１５°の回転ぶれを補正するための第３レンズ群Ｇ３の移動量は０．１８（ｍｍ）である。 In the wide-angle end state (W) of the fifth embodiment, the image stabilization coefficient is −2.12, and the focal length is 72.06 (mm). Therefore, the first correction for correcting the rotation blur of 0.30 ° is performed. The moving amount of the three lens group G3 is 0.18 mm. In the telephoto end state (T), since the image stabilization coefficient is −4.32 and the focal length is 290.00 (mm), the third lens group for correcting the rotational blur of 0.15 °. The moving amount of G3 is 0.18 (mm).
以下に、前述した本発明の結像光学系の各実施例の具体的な数値データを示す。 Specific numerical data of each embodiment of the imaging optical system of the present invention described above will be shown below.
［面データ］において、面番号は物体側から数えたレンズ面又は開口絞りの番号、ｒは各面の曲率半径、ｄは各面の間隔、ｎｄはｄ線（波長５８７．５６ｎｍ）に対する屈折率、ｖｄはｄ線に対するアッベ数を示している。 In [Surface data], the surface number is the number of the lens surface or aperture stop counted from the object side, r is the radius of curvature of each surface, d is the distance between the surfaces, nd is the refractive index with respect to the d-line (wavelength 587.56 nm). , Vd indicate Abbe numbers for the d line.
ＢＦはバックフォーカスを表している。 BF represents back focus.
面番号に付した（絞り）は、その位置に開口絞りが位置していることを示している。平面又は開口絞りに対する曲率半径には∞（無限大）を記入している。 The (diaphragm) attached to the surface number indicates that the aperture stop is located at that position. ∞ (infinity) is entered in the radius of curvature for a plane or aperture stop.
［各種データ］には、ズーム比及び各焦点距離状態における焦点距離等の値を示している。 [Various data] shows values such as the zoom ratio and the focal length in each focal length state.
［可変間隔データ］には、各焦点距離状態における可変間隔及びＢＦの値を示している。 [Variable interval data] indicates the variable interval and the value of BF in each focal length state.
［レンズ群データ］には、各レンズ群を構成する最も物体側の面番号及び群全体の合成焦点距離を示している。 [Lens Group Data] indicates the surface number of the most object side constituting each lens group and the combined focal length of the entire group.
なお、以下の全ての諸元の値において、記載している焦点距離ｆ、曲率半径ｒ、レンズ面間隔ｄ、その他の長さの単位は特記のない限りミリメートル（ｍｍ）を使用するが、光学系では比例拡大と比例縮小とにおいても同等の光学性能が得られるので、これに限られるものではない。 In all the values of the following specifications, the focal length f, the radius of curvature r, the lens surface interval d, and other length units described are in millimeters (mm) unless otherwise specified. In the system, the same optical performance can be obtained even in proportional expansion and proportional reduction, and the present invention is not limited to this.
また、これらの各実施例における条件式の対応値の一覧を示す。 In addition, a list of corresponding values of the conditional expressions in each of these examples is shown.
また、各実施例に対応する収差図において、ｄ、ｇ、Ｃはそれぞれｄ線、ｇ線、Ｃ線を表しており、△Ｓ、△Ｍはそれぞれサジタル像面、メリジオナル像面を表している。 In the aberration diagrams corresponding to each example, d, g, and C represent d-line, g-line, and C-line, respectively, and ΔS and ΔM represent sagittal image plane and meridional image plane, respectively. .
数値実施例１
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 97.6154 1.7000 1.69479 53.41
2 65.9213 7.6006 1.43700 95.10
3 1000.0000 15.9350
4 75.5037 1.5000 1.70154 41.15
5 49.3658 8.5292 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.5144 1.48749 70.44
8 -249.6178 (d8)
9 -160.7774 0.8000 1.77250 49.62
10 42.9009 2.6931
11 -45.9445 0.8000 1.72916 54.67
12 34.7038 3.1916 1.84666 23.78
13 1000.0000 (d13)
14 -208.1114 3.1617 1.59282 68.62
15 -46.7453 0.1500
16 41.5250 5.6500 1.65844 50.85
17 -41.5250 0.9000 1.75520 27.53
18 226.3365 2.5261
19（絞り） ∞ (d19)
20 -37.8465 0.8000 1.61800 63.40
21 82.7888 2.2737 1.72825 28.32
22 -478.5749 (d22)
23 -331.3216 3.4697 1.80611 40.73
24 -40.8055 0.1500
25 60.0000 5.5925 1.49700 81.61
26 -37.7606 0.8000 2.00060 25.46
27 -360.7781 0.1500
28 54.8081 2.9834 1.70154 41.15
29 1000.0000 (d29)
30 67.0000 0.8000 1.83400 37.35
31 31.2000 2.4825
32 603.0256 3.8253 1.62004 36.30
33 -39.9134 2.9274
34 -37.2692 0.9000 1.80420 46.50
35 48.7606 0.4158
36 44.5743 4.1695 1.74077 27.76
37 -589.4897 (BF)
像面 ∞
[各種データ]
ズーム比 4.02
広角 中間 望遠
焦点距離 72.04 144.12 289.92
Fナンバー 4.09 4.93 5.86
全画角2ω 33.41 17.07 8.53
像高Y 21.63 21.63 21.63
レンズ全長 197.80 223.03 245.17
[可変間隔データ]
広角 中間 望遠
d6 4.1747 29.3747 51.4475
d8 3.5677 3.5677 3.4377
d13 19.2217 8.5339 1.9536
d19 3.8158 14.5036 21.2138
d22 16.3371 9.0830 1.7500
d29 10.3916 11.6546 0.8800
BF 52.0021 57.9932 76.1008
[レンズ群データ]
群 始面 焦点距離
G1 1 123.77
G2 7 512.05
G3 9 -27.00
G4 14 48.36
G5 20 -74.50
G6 23 37.00
G7 30 -57.21
G11 1 356.05
G12 4 176.67
Numerical example 1
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 97.6154 1.7000 1.69479 53.41
2 65.9213 7.6006 1.43700 95.10
3 1000.0000 15.9350
4 75.5037 1.5000 1.70154 41.15
5 49.3658 8.5292 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.5144 1.48749 70.44
8 -249.6178 (d8)
9 -160.7774 0.8000 1.77250 49.62
10 42.9009 2.6931
11 -45.9445 0.8000 1.72916 54.67
12 34.7038 3.1916 1.84666 23.78
13 1000.0000 (d13)
14 -208.1114 3.1617 1.59282 68.62
15 -46.7453 0.1500
16 41.5250 5.6500 1.65844 50.85
17 -41.5250 0.9000 1.75520 27.53
18 226.3365 2.5261
19 (Aperture) ∞ (d19)
20 -37.8465 0.8000 1.61800 63.40
21 82.7888 2.2737 1.72825 28.32
22 -478.5749 (d22)
23 -331.3216 3.4697 1.80611 40.73
24 -40.8055 0.1500
25 60.0000 5.5925 1.49700 81.61
26 -37.7606 0.8000 2.00060 25.46
27 -360.7781 0.1500
28 54.8081 2.9834 1.70154 41.15
29 1000.0000 (d29)
30 67.0000 0.8000 1.83400 37.35
31 31.2000 2.4825
32 603.0256 3.8253 1.62004 36.30
33 -39.9134 2.9274
34 -37.2692 0.9000 1.80420 46.50
35 48.7606 0.4158
36 44.5743 4.1695 1.74077 27.76
37 -589.4897 (BF)
Image plane ∞
[Various data]
Zoom ratio 4.02
Wide angle Medium telephoto Focal length 72.04 144.12 289.92
F number 4.09 4.93 5.86
Full angle 2ω 33.41 17.07 8.53
Image height Y 21.63 21.63 21.63
Total lens length 197.80 223.03 245.17
[Variable interval data]
Wide angle Medium telephoto
d6 4.1747 29.3747 51.4475
d8 3.5677 3.5677 3.4377
d13 19.2217 8.5339 1.9536
d19 3.8158 14.5036 21.2138
d22 16.3371 9.0830 1.7500
d29 10.3916 11.6546 0.8800
BF 52.0021 57.9932 76.1008
[Lens group data]
Group Start surface Focal length
G3 9 -27.00
G4 14 48.36
G5 20 -74.50
G6 23 37.00
G7 30 -57.21
数値実施例２
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 114.5709 1.7000 1.69479 53.41
2 75.7097 6.9402 1.43700 95.10
3 1000.0000 15.9350
4 70.8617 1.5000 1.70154 41.15
5 46.5586 9.0766 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.3113 1.48749 70.44
8 -219.0413 (d8)
9 -183.7015 0.8000 1.77250 49.62
10 40.5430 2.7812
11 -44.2563 0.8000 1.72916 54.67
12 33.9595 3.2099 1.84666 23.78
13 865.7356 (d13)
14 747.7732 3.9589 1.59282 68.62
15 -60.0147 0.1500
16 42.1570 7.3564 1.65844 50.85
17 -42.1570 0.9000 1.75520 27.53
18 229.9000 1.9320
19（絞り） ∞ (d19)
20 -40.8335 0.8000 1.61800 63.40
21 89.4985 2.1453 1.72825 28.32
22 -1000.0000 (d22)
23 -220.0000 3.2253 1.80611 40.73
24 -41.1881 0.1500
25 60.0000 5.6412 1.49700 81.61
26 -39.5389 0.8000 2.00069 25.46
27 -254.8266 0.1500
28 47.1102 2.8910 1.74400 44.90
29 162.1584 (d29)
30 69.5000 0.8000 1.91082 35.25
31 32.1203 2.4338
32 243.5562 3.7372 1.64769 33.84
33 -43.8413 3.5108
34 -37.6588 0.9000 1.80420 46.50
35 52.1500 0.4766
36 46.6013 3.8500 1.74077 27.76
37 -620.0000 (BF)
像面 ∞
[各種データ]
ズーム比 4.02
広角 中間 望遠
焦点距離 72.13 144.18 290.00
Fナンバー 4.13 5.21 5.88
全画角2ω 33.92 16.82 8.33
像高Y 21.63 21.63 21.63
レンズ全長 197.90 219.39 247.87
[可変間隔データ]
広角 中間 望遠
d6 4.1536 25.6424 54.1175
d8 3.5000 3.5000 3.3700
d13 17.2849 3.5530 1.5854
d19 3.7057 0.5347 16.0097
d22 16.6833 14.1924 1.9115
d29 10.7097 14.2690 1.2802
BF 52.0021 67.8365 79.7289
[レンズ群データ]
群 始面 焦点距離
G1 1 125.90
G2 7 449.33
G3 9 -26.15
G4 14 46.85
G5 20 -76.06
G6 23 37.50
G7 30 -58.91
G11 1 444.18
G12 4 166.08
Numerical example 2
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 114.5709 1.7000 1.69479 53.41
2 75.7097 6.9402 1.43700 95.10
3 1000.0000 15.9350
4 70.8617 1.5000 1.70154 41.15
5 46.5586 9.0766 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.3113 1.48749 70.44
8 -219.0413 (d8)
9 -183.7015 0.8000 1.77250 49.62
10 40.5430 2.7812
11 -44.2563 0.8000 1.72916 54.67
12 33.9595 3.2099 1.84666 23.78
13 865.7356 (d13)
14 747.7732 3.9589 1.59282 68.62
15 -60.0147 0.1500
16 42.1570 7.3564 1.65844 50.85
17 -42.1570 0.9000 1.75520 27.53
18 229.9000 1.9320
19 (Aperture) ∞ (d19)
20 -40.8335 0.8000 1.61800 63.40
21 89.4985 2.1453 1.72825 28.32
22 -1000.0000 (d22)
23 -220.0000 3.2253 1.80611 40.73
24 -41.1881 0.1500
25 60.0000 5.6412 1.49700 81.61
26 -39.5389 0.8000 2.00069 25.46
27 -254.8266 0.1500
28 47.1102 2.8910 1.74400 44.90
29 162.1584 (d29)
30 69.5000 0.8000 1.91082 35.25
31 32.1203 2.4338
32 243.5562 3.7372 1.64769 33.84
33 -43.8413 3.5108
34 -37.6588 0.9000 1.80420 46.50
35 52.1500 0.4766
36 46.6013 3.8500 1.74077 27.76
37 -620.0000 (BF)
Image plane ∞
[Various data]
Zoom ratio 4.02
Wide angle Medium telephoto Focal length 72.13 144.18 290.00
F number 4.13 5.21 5.88
Full angle of view 2ω 33.92 16.82 8.33
Image height Y 21.63 21.63 21.63
Total lens length 197.90 219.39 247.87
[Variable interval data]
Wide angle Medium telephoto
d6 4.1536 25.6424 54.1175
d8 3.5000 3.5000 3.3700
d13 17.2849 3.5530 1.5854
d19 3.7057 0.5347 16.0097
d22 16.6833 14.1924 1.9115
d29 10.7097 14.2690 1.2802
BF 52.0021 67.8365 79.7289
[Lens group data]
Group Start surface Focal length
G3 9 -26.15
G4 14 46.85
G5 20 -76.06
G6 23 37.50
G7 30 -58.91
数値実施例３
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 118.3473 1.7000 1.74400 44.90
2 77.0508 6.5823 1.49700 81.61
3 870.1469 17.1558
4 73.6938 1.5000 1.70154 41.15
5 48.0735 8.7659 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.4813 1.48749 70.44
8 -280.7924 (d8)
9 -160.2741 0.8000 1.77250 49.62
10 44.5600 2.5880
11 -46.8243 0.8000 1.72916 54.67
12 35.9855 3.1168 1.84666 23.78
13 2086.4635 (d13)
14 -167.1109 2.5290 1.59282 68.62
15 -50.8805 0.1500
16 44.3142 5.1789 1.65844 50.85
17 -44.3142 0.9000 1.74077 27.76
18 398.1742 1.7320
19（絞り） ∞ (d19)
20 -37.0192 0.8000 1.61800 63.40
21 102.8969 2.1172 1.72825 28.32
22 -433.7906 (d22)
23 -481.3125 3.3411 1.80611 40.73
24 -41.7060 0.1876
25 77.7917 5.0000 1.49700 81.61
26 -37.1256 0.8000 2.00069 25.46
27 -149.3610 0.1500
28 52.7494 2.4884 1.62041 60.34
29 234.8149 (d29)
30 67.0000 0.8000 1.83400 37.34
31 32.7115 2.4700
32 437.9623 3.4568 1.62004 36.30
33 -42.4601 3.5196
34 -39.2283 0.9000 1.80420 46.50
35 50.8007 0.1500
36 45.5483 3.8866 1.74077 27.76
37 -620.0000 (BF)
像面 ∞
[各種データ]
ズーム比 4.02
広角 中間 望遠
焦点距離 72.06 144.19 289.99
Fナンバー 4.12 4.98 5.87
全画角2ω 34.05 16.68 8.29
像高Y 21.63 21.63 21.63
レンズ全長 197.63 222.83 246.66
[可変間隔データ]
広角 中間 望遠
d6 4.6231 29.8231 53.6622
d8 3.5747 3.5747 3.4447
d13 19.7056 8.1964 2.4351
d19 4.2721 15.7812 21.6726
d22 15.4396 8.3841 1.6734
d29 12.9612 15.5620 1.0953
BF 52.0021 56.4568 77.6341
[レンズ群データ]
群 始面 焦点距離
G1 1 125.73
G2 7 576.00
G3 9 -28.06
G4 14 50.90
G5 20 -72.00
G6 23 38.18
G7 30 -64.36
G11 1 393.60
G12 4 173.07
Numerical Example 3
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 118.3473 1.7000 1.74400 44.90
2 77.0508 6.5823 1.49700 81.61
3 870.1469 17.1558
4 73.6938 1.5000 1.70154 41.15
5 48.0735 8.7659 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.4813 1.48749 70.44
8 -280.7924 (d8)
9 -160.2741 0.8000 1.77250 49.62
10 44.5600 2.5880
11 -46.8243 0.8000 1.72916 54.67
12 35.9855 3.1168 1.84666 23.78
13 2086.4635 (d13)
14 -167.1109 2.5290 1.59282 68.62
15 -50.8805 0.1500
16 44.3142 5.1789 1.65844 50.85
17 -44.3142 0.9000 1.74077 27.76
18 398.1742 1.7320
19 (Aperture) ∞ (d19)
20 -37.0192 0.8000 1.61800 63.40
21 102.8969 2.1172 1.72825 28.32
22 -433.7906 (d22)
23 -481.3125 3.3411 1.80611 40.73
24 -41.7060 0.1876
25 77.7917 5.0000 1.49700 81.61
26 -37.1256 0.8000 2.00069 25.46
27 -149.3610 0.1500
28 52.7494 2.4884 1.62041 60.34
29 234.8149 (d29)
30 67.0000 0.8000 1.83400 37.34
31 32.7115 2.4700
32 437.9623 3.4568 1.62004 36.30
33 -42.4601 3.5196
34 -39.2283 0.9000 1.80420 46.50
35 50.8007 0.1500
36 45.5483 3.8866 1.74077 27.76
37 -620.0000 (BF)
Image plane ∞
[Various data]
Zoom ratio 4.02
Wide angle Medium telephoto Focal length 72.06 144.19 289.99
F number 4.12 4.98 5.87
Full angle of view 2ω 34.05 16.68 8.29
Image height Y 21.63 21.63 21.63
Total lens length 197.63 222.83 246.66
[Variable interval data]
Wide angle Medium telephoto
d6 4.6231 29.8231 53.6622
d8 3.5747 3.5747 3.4447
d13 19.7056 8.1964 2.4351
d19 4.2721 15.7812 21.6726
d22 15.4396 8.3841 1.6734
d29 12.9612 15.5620 1.0953
BF 52.0021 56.4568 77.6341
[Lens group data]
Group Start surface Focal length
G3 9 -28.06
G4 14 50.90
G5 20 -72.00
G6 23 38.18
G7 30 -64.36
数値実施例４
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 107.3759 1.7000 1.74400 44.90
2 69.1832 7.0531 1.49700 81.61
3 1060.8331 17.7083
4 79.5482 1.5000 1.70154 41.15
5 52.1223 7.9409 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.4925 1.48749 70.44
8 -238.2434 (d8)
9 -148.2835 0.8000 1.77250 49.62
10 43.5753 2.6614
11 -44.4465 0.8000 1.72916 54.67
12 34.1581 3.1653 1.84666 23.78
13 800.1022 (d13)
14 -134.6122 2.5288 1.59282 68.62
15 -44.3566 0.1500
16 37.9996 5.6999 1.65844 50.85
17 -37.9996 0.9000 1.74077 27.76
18 283.4405 1.7896
19（絞り） ∞ (d19)
20 -35.4040 0.8000 1.61800 63.40
21 83.8385 2.2131 1.72825 28.32
22 -2686.6099 (d22)
23 -556.2629 3.5735 1.80611 40.73
24 -38.5938 2.6486
25 133.4628 5.0000 1.49700 81.61
26 -31.1095 0.8000 2.00069 25.46
27 -82.4973 0.1500
28 42.3141 2.0267 1.62041 60.34
29 58.8162 (d29)
30 67.0000 0.8000 1.83400 37.34
31 42.6521 2.4700
32 254.8081 4.0037 1.62004 36.30
33 -40.7544 0.2639
34 -37.7110 0.9000 1.80420 46.50
35 62.0457 3.4994 1.74077 27.76
36 -620.0000 (BF)
像面 ∞
[各種データ]
ズーム比 4.02
広角 中間 望遠
焦点距離 72.06 144.20 290.00
Fナンバー 4.12 4.99 5.87
全画角2ω 33.97 16.64 8.28
像高Y 21.63 21.63 21.63
レンズ全長 197.74 228.45 247.74
[可変間隔データ]
広角 中間 望遠
d6 4.6252 35.3341 54.6252
d8 3.5478 1.7424 1.9188
d13 19.2486 12.3188 2.1213
d19 4.3939 13.1291 23.1502
d22 13.6725 7.1134 1.7744
d29 19.2943 14.9472 1.9785
BF 47.9203 58.8264 77.1342
[レンズ群データ]
群 始面 焦点距離
G1 1 126.12
G2 7 488.71
G3 9 -26.37
G4 14 45.17
G5 20 -63.09
G6 23 42.66
G7 30 -95.04
G11 1 341.89
G12 4 185.00
Numerical Example 4
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 107.3759 1.7000 1.74400 44.90
2 69.1832 7.0531 1.49700 81.61
3 1060.8331 17.7083
4 79.5482 1.5000 1.70154 41.15
5 52.1223 7.9409 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.4925 1.48749 70.44
8 -238.2434 (d8)
9 -148.2835 0.8000 1.77250 49.62
10 43.5753 2.6614
11 -44.4465 0.8000 1.72916 54.67
12 34.1581 3.1653 1.84666 23.78
13 800.1022 (d13)
14 -134.6122 2.5288 1.59282 68.62
15 -44.3566 0.1500
16 37.9996 5.6999 1.65844 50.85
17 -37.9996 0.9000 1.74077 27.76
18 283.4405 1.7896
19 (Aperture) ∞ (d19)
20 -35.4040 0.8000 1.61800 63.40
21 83.8385 2.2131 1.72825 28.32
22 -2686.6099 (d22)
23 -556.2629 3.5735 1.80611 40.73
24 -38.5938 2.6486
25 133.4628 5.0000 1.49700 81.61
26 -31.1095 0.8000 2.00069 25.46
27 -82.4973 0.1500
28 42.3141 2.0267 1.62041 60.34
29 58.8162 (d29)
30 67.0000 0.8000 1.83400 37.34
31 42.6521 2.4700
32 254.8081 4.0037 1.62004 36.30
33 -40.7544 0.2639
34 -37.7110 0.9000 1.80420 46.50
35 62.0457 3.4994 1.74077 27.76
36 -620.0000 (BF)
Image plane ∞
[Various data]
Zoom ratio 4.02
Wide angle Medium telephoto Focal length 72.06 144.20 290.00
F number 4.12 4.99 5.87
Full angle 2ω 33.97 16.64 8.28
Image height Y 21.63 21.63 21.63
Total lens length 197.74 228.45 247.74
[Variable interval data]
Wide angle Medium telephoto
d6 4.6252 35.3341 54.6252
d8 3.5478 1.7424 1.9188
d13 19.2486 12.3188 2.1213
d19 4.3939 13.1291 23.1502
d22 13.6725 7.1134 1.7744
d29 19.2943 14.9472 1.9785
BF 47.9203 58.8264 77.1342
[Lens group data]
Group Start surface Focal length
G3 9 -26.37
G4 14 45.17
G5 20 -63.09
G6 23 42.66
G7 30 -95.04
数値実施例５
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 107.8330 1.7000 1.69479 53.41
2 68.3967 7.3917 1.43700 95.10
3 1000.0000 15.9350
4 71.9811 1.5000 1.70154 41.15
5 48.1870 8.7415 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.7253 1.48749 70.45
8 -163.5727 (d8)
9 -155.0638 0.8000 1.77250 49.62
10 43.8882 2.6516
11 -46.9081 0.8000 1.72916 54.67
12 35.9376 3.1017 1.84666 23.78
13 672.9001 (d13)
14 1617.3627 2.6019 1.59282 68.63
15 -63.8442 0.1500
16 45.5524 5.0426 1.65844 50.86
17 -45.5524 0.9000 1.75520 27.53
18 331.6724 1.6586
19（絞り） ∞ (d19)
20 -39.1030 0.8000 1.61800 63.40
21 83.6023 2.1995 1.72825 28.32
22 -1000.0000 (d22)
23 -220.0000 3.2458 1.80610 40.73
24 -40.8287 2.8017
25 60.0000 5.7272 1.49700 81.61
26 -37.9380 0.8000 2.00069 25.46
27 -265.6861 0.1500
28 52.3063 3.0137 1.74400 44.90
29 396.2034 (d29)
30 67.5167 0.8000 1.91082 35.25
31 32.8791 2.4739
32 369.9971 3.8163 1.64769 33.84
33 -39.6036 2.4747
34 -37.2433 0.9000 1.80420 46.50
35 52.1500 2.2869
36 53.9852 3.8500 1.74077 27.76
37 -620.0000 (BF)
像面 ∞
[各種データ]
ズーム比 4.02
広角 中間 望遠
焦点距離 72.15 144.20 289.99
Fナンバー 4.12 4.81 5.72
全画角2ω 33.85 16.63 8.29
像高Y 21.63 21.63 21.63
レンズ全長 197.90 223.23 242.28
[可変間隔データ]
広角 中間 望遠
d6 4.1722 29.4968 48.5552
d8 3.7019 6.4829 8.3901
d13 19.0865 9.4813 1.6492
d19 3.7478 10.5724 16.4970
d22 16.5624 10.3144 2.2710
d29 12.7570 12.0353 0.9488
BF 47.8346 54.8042 73.9339
[レンズ群データ]
群 始面 焦点距離
G1 1 125.85
G2 7 335.54
G3 9 -27.00
G4 14 49.93
G5 20 -72.84
G6 23 37.57
G7 30 -59.33
G11 1 440.45
G12 4 166.26
Numerical Example 5
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 107.8330 1.7000 1.69479 53.41
2 68.3967 7.3917 1.43700 95.10
3 1000.0000 15.9350
4 71.9811 1.5000 1.70154 41.15
5 48.1870 8.7415 1.49700 81.61
6 -1000.0000 (d6)
7 ∞ 1.7253 1.48749 70.45
8 -163.5727 (d8)
9 -155.0638 0.8000 1.77250 49.62
10 43.8882 2.6516
11 -46.9081 0.8000 1.72916 54.67
12 35.9376 3.1017 1.84666 23.78
13 672.9001 (d13)
14 1617.3627 2.6019 1.59282 68.63
15 -63.8442 0.1500
16 45.5524 5.0426 1.65844 50.86
17 -45.5524 0.9000 1.75520 27.53
18 331.6724 1.6586
19 (Aperture) ∞ (d19)
20 -39.1030 0.8000 1.61800 63.40
21 83.6023 2.1995 1.72825 28.32
22 -1000.0000 (d22)
23 -220.0000 3.2458 1.80610 40.73
24 -40.8287 2.8017
25 60.0000 5.7272 1.49700 81.61
26 -37.9380 0.8000 2.00069 25.46
27 -265.6861 0.1500
28 52.3063 3.0137 1.74400 44.90
29 396.2034 (d29)
30 67.5167 0.8000 1.91082 35.25
31 32.8791 2.4739
32 369.9971 3.8163 1.64769 33.84
33 -39.6036 2.4747
34 -37.2433 0.9000 1.80420 46.50
35 52.1500 2.2869
36 53.9852 3.8500 1.74077 27.76
37 -620.0000 (BF)
Image plane ∞
[Various data]
Zoom ratio 4.02
Wide angle Medium telephoto Focal length 72.15 144.20 289.99
F number 4.12 4.81 5.72
Full angle of view 2ω 33.85 16.63 8.29
Image height Y 21.63 21.63 21.63
Total lens length 197.90 223.23 242.28
[Variable interval data]
Wide angle Medium telephoto
d6 4.1722 29.4968 48.5552
d8 3.7019 6.4829 8.3901
d13 19.0865 9.4813 1.6492
d19 3.7478 10.5724 16.4970
d22 16.5624 10.3144 2.2710
d29 12.7570 12.0353 0.9488
BF 47.8346 54.8042 73.9339
[Lens group data]
Group Start surface Focal length
G3 9 -27.00
G4 14 49.93
G5 20 -72.84
G6 23 37.57
G7 30 -59.33
[条件式対応値]
条件式／実施例 1 2 3 4 5
(1)０．３０＜ｆ１２／ｆ１１＜０．６０ 0.50 0.37 0.44 0.54 0.38
(2)０．２０＜｜ｆ３／ｆ１｜＜０．２３ 0.22 0.21 0.22 0.21 0.21
(3)１．５０＜ｆ２／ｆ１２＜４．００ 2.90 2.71 3.33 2.64 2.02
[Values for conditional expressions]
Conditional expression / Example 1 2 3 4 5
(1) 0.30 <f12 / f11 <0.60 0.50 0.37 0.44 0.54 0.38
(2) 0.20 <| f3 / f1 | <0.23 0.22 0.21 0.22 0.21 0.21
(3) 1.50 <f2 / f12 <4.00 2.90 2.71 3.33 2.64 2.02
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
Ｇ７ 第７レンズ群
Ｇ１１ 第１レンズ群前群
Ｇ１２ 第１レンズ群後群
Ｓ 開口絞り
Ｉ 像面
G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group G6 6th lens group G7 7th lens group G11 1st lens group front group G12 1st lens group back group S Aperture stop I Image plane
Claims (1)
（１）０．３０＜ｆ１２／ｆ１１＜０．６０
（２）０．２０＜｜ｆ３／ｆ１｜＜０．２３
（３）１．５０＜ｆ２／ｆ１２＜４．００
ただし、
ｆ１１：前記第１１レンズ群の焦点距離
ｆ１２：前記第１２レンズ群の焦点距離
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｆ３：前記第３レンズ群の焦点距離 In order from the object side, a first lens unit having a positive refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, and a first lens unit having a negative refractive power. An image plane at the time of occurrence of camera shake by having a fifth lens group, a sixth lens group having a positive refractive power, and a seventh lens group having a negative refractive power, and moving the third lens group in a direction orthogonal to the optical axis. The image blur correction is performed, and the first lens group includes, in order from the object side, an eleventh lens group having a positive refractive power and a twelfth lens group having a positive refractive power, and the twelfth lens group toward the object side. A zoom lens having an anti-vibration function characterized by focusing from infinity to a short distance by extending and satisfying the following conditions.
(1) 0.30 <f12 / f11 <0.60
(2) 0.20 <| f3 / f1 | <0.23
(3) 1.50 <f2 / f12 <4.00
However,
f11: focal length of the eleventh lens group f12: focal length of the twelfth lens group f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group
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| CN111123494A (en) * | 2019-12-03 | 2020-05-08 | 宁波永新光学股份有限公司 | Optical system of high zoom ratio continuous zooming stereomicroscope |
| WO2020136747A1 (en) * | 2018-12-26 | 2020-07-02 | 株式会社ニコン | Variable magnification optical system, optical device, and method for manufacturing variable magnification optical system |
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