JP2005331697A - High variable power ratio zoom lens - Google Patents

High variable power ratio zoom lens Download PDF

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JP2005331697A
JP2005331697A JP2004149824A JP2004149824A JP2005331697A JP 2005331697 A JP2005331697 A JP 2005331697A JP 2004149824 A JP2004149824 A JP 2004149824A JP 2004149824 A JP2004149824 A JP 2004149824A JP 2005331697 A JP2005331697 A JP 2005331697A
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lens
lens group
angle end
group
wide
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JP4679835B2 (en
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Tetsusuke Kusakawa
徹介 草川
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Sigma Corp
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Sigma Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and high-performance high variable power ratio zoom lens which realizes a viewing angle of the extent of 76° equivalent to that of 28 mm of a single lens reflex camera, having a 35 mm film and a zooming ratio of about 7 times, when being mounted to a lens interchangeable digital single lens reflex camera, has the back-focus equal to that of the lens interchangeable single lens reflex camera. <P>SOLUTION: The high variable power-rate zoom lens is composed of four lens groups of a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power and a fourth lens group G4, having positive refractive power in order from the object side. When power is varied from wide angle end to telephoto end, the air interval between the first lens group G1 and the second lens group G2 is enlarged; the interval between the second lens group G2 and the third lens group G3 is shortened; at the same time, the first lens group G1, the third lens group G3 and the fourth lens group G4 are moved in the direction of the object; and focusing is performed by moving the second lens group G2 to make specified conditions satisfied. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、デジタルスチルカメラやビデオカメラ等に用いられるズーム比が７倍程度、広角端の画角が７６度程度の、高性能な高変倍率ズームレンズに関するものである。   The present invention relates to a high-performance, high-magnification zoom lens that has a zoom ratio of about 7 times and a wide-angle end angle of view of about 76 degrees used in digital still cameras, video cameras, and the like.

ズーム比が７倍程度で広角端の画角が７６度程度の３５ｍｍフィルム一眼レフカメラ用高倍率ズームレンズは特開２０００−８９１１７号公報、特開２００２−２３６２５５号公報で開示されているが、ＡＰＳ−Ｃサイズのイメージセンサーを用いたレンズ交換式デジタル一眼レフカメラ用で広角から望遠までをカバーする高倍率ズームレンズは存在しない。３５ｍｍフィルム一眼レフカメラ用レンズをＡＰＳ−Ｃサイズのイメージセンサーを用いたレンズ交換式デジタル一眼レフカメラに転用して同じ画角を実現しようとすれば、イメージセンサーが３５ｍｍフィルムの０.６３倍程度の大きさなので、３５ｍｍフィルム一眼レフカメラ用レンズに０.６３倍のスケーリングを行い、システムを構成する必要がある。   High-magnification zoom lenses for 35 mm film single-lens reflex cameras having a zoom ratio of about 7 times and an angle of view at the wide-angle end of about 76 degrees are disclosed in JP-A-2000-89117 and JP-A-2002-236255. There is no high-magnification zoom lens that covers from wide angle to telephoto for interchangeable-lens digital SLR cameras using APS-C size image sensors. If the lens for a 35mm film SLR camera is converted to a lens interchangeable digital SLR camera using an APS-C size image sensor to achieve the same angle of view, the image sensor will be about 0.63 times the 35mm film. Therefore, it is necessary to construct a system by scaling 0.63 times to a lens for a 35 mm film single lens reflex camera.

しかし、スケーリング係数が小さいので、スケーリングしたシステムは個々のレンズの中心厚やコバ厚、あるいはレンズ間隔が小さくなりすぎて生産性に問題が生じ、更にバックフォーカスが短くなるのでレンズ交換式一眼レフカメラシステムに問題が生じて来る。スケーリング前のコンパクトさや高性能を維持しながら、良好な生産性を実現し、バックフォーカスを長くする広角高倍率ズームレンズの設計は簡単な作業ではなく、新しい技術内容が必要である。
特開２０００−８９１１７号公報 特開２００２−２３６２５５号公報 However, since the scaling factor is small, the scaled system has a problem in productivity because the center thickness and edge thickness of each lens or the lens interval becomes too small, and the back focus is shortened. Problems arise in the system. Designing a wide-angle, high-magnification zoom lens that achieves good productivity and lengthens back focus while maintaining compactness and high performance before scaling is not an easy task and requires new technical content.
JP 2000-89117 A JP 2002-236255 A

本発明はＡＰＳ−Ｃサイズのイメージセンサーを用いたデジタルカメラに装着した時に、３５ｍｍフィルム一眼レフカメラの２８ｍｍに相当する７６度程度の画角をカバーし、７倍程度のズーム比を実現しながら、レンズ交換式一眼レフカメラに相応しいバックフォーカスの長さと、コンパクトで高性能な高変倍率ズームレンズの提供を目的とする。   The present invention covers an angle of view of about 76 degrees corresponding to 28 mm of a 35 mm film single-lens reflex camera when mounted on a digital camera using an APS-C size image sensor, and realizes a zoom ratio of about 7 times. The objective is to provide a back focus length suitable for interchangeable lens SLR cameras and a compact, high-performance, high-magnification zoom lens.

本発明は、ワイドの焦点距離１８ｍｍを実現しながら７倍程度のズーム比を持ち、ワイド１８ｍｍの時に３５ｍｍフィルム一眼レフと変わらないバックフォーカスを持ち、高度な収差補正と、製造し易い公差を同時に実現しなければならないと言う設計上の矛盾を、以下の構成と条件を与えることにより解決した。   The present invention has a zoom ratio of about 7 times while realizing a wide focal length of 18 mm, and has a back focus that is the same as that of a 35 mm film single lens reflex camera at a wide 18 mm, simultaneously with advanced aberration correction and easy manufacturing tolerances. The design contradiction that must be realized was solved by giving the following configuration and conditions.

すなわち、物体側より順に正のパワーの第１レンズ群、負のパワーの第２レンズ群、正のパワーの第３レンズ群、正のパワーの第４レンズ群で構成され、広角端から望遠端の変倍に際し第１レンズ群と第２レンズ群の空気間隔が増大し、第２レンズ群と第３レンズ群の空気間隔が減少しながら第１，第３，第４の各レンズ群が物体方向に移動し、フォーカシングを第２レンズ群の繰り出しによって行い、以下の条件を満足させた。
（１）０.４０＜ｆＷ／ｆｂＷ＜０.５５
（２）０.４３＜β３，４Ｗ／β３，４Ｔ＜０.４７
（３）４０＜ｒ５／ｄ５Ｗ＜１００
（４）１.１＜ｆ３／ｆ４＜２.６
但し、
ｆＷ：広角端の焦点距離
ｆｂＷ：広角端のバックフォーカス
β３，４Ｗ：第３，第４レンズ群の広角端の合成倍率
β３，４Ｔ：第３，第４レンズ群の望遠端の合成倍率
ｒ５：ｒ５面の曲率半径
ｄ５Ｗ：広角端の第１レンズ群と第２レンズ群のレンズ間隔
ｆ３：第３レンズ群の焦点距離
ｆ４：第４レンズ群の焦点距離
である。 In other words, the first lens group having a positive power, the second lens group having a negative power, the third lens group having a positive power, and the fourth lens group having a positive power are arranged in order from the object side. The first, second, and third lens groups are subject to an object while the air distance between the first lens group and the second lens group is increased and the air distance between the second lens group and the third lens group is decreased. Then, focusing was performed by extending the second lens unit, and the following conditions were satisfied.
(1) 0.40 <fW / fbW <0.55
(2) 0.43 <β3, 4W / β3, 4T <0.47
(3) 40 <r5 / d5W <100
(4) 1.1 <f3 / f4 <2.6
However,
fW: Focal length at wide angle end fbW: Back focus at wide angle end β3, 4W: Composite magnification at wide angle end of third and fourth lens groups β3, 4T: Composite magnification at telephoto end of third and fourth lens groups r5: The radius of curvature d5W of the r5 surface is the lens interval between the first lens unit and the second lens unit at the wide angle end f3: the focal length of the third lens unit f4: the focal length of the fourth lens unit.

本発明によれば、物体側より順に正、負、正、正の屈折力を有する４群ズームレンズ群のパワーと移動量方向の限定と４つの条件により、広角域を含む高性能な高変倍率ズームレンズでありながらズーミングによる動きのスムーズさと収差変動の少ないシステムが実現できる。   According to the present invention, a high-performance high-change including a wide-angle region is obtained by the power and the movement amount direction limitation of the four-group zoom lens group having positive, negative, positive, and positive refractive power in order from the object side and four conditions. Although it is a magnification zoom lens, it can realize a system with smooth movement by zooming and less aberration fluctuation.

条件式（１）は広角端におけるパワーとバックフォーカスの関係を規定する。この条件は広角端における焦点距離に対して相対的にバックフォーカスの長いレンズを実現する為に必要である。条件式（１）の上限を超えれば歪曲収差と球面収差の補正に有利であるが、広い画角と長いバックフォーカスが実現できない。逆に下限を超えると、広い画角と長いバックフォーカスは実現出来るが、収差補正が困難になり、特に歪曲収差補正の困難さが急増する。   Conditional expression (1) defines the relationship between power and back focus at the wide-angle end. This condition is necessary for realizing a lens having a long back focus relative to the focal length at the wide angle end. If the upper limit of conditional expression (1) is exceeded, it is advantageous for correcting distortion and spherical aberration, but a wide angle of view and a long back focus cannot be realized. On the contrary, if the lower limit is exceeded, a wide angle of view and a long back focus can be realized, but aberration correction becomes difficult, and in particular, distortion aberration correction is rapidly increased.

条件式（２）は本発明の高変倍率ズームレンズにおいて、第３レンズ群Ｇ３、第４レンズ群Ｇ４をバックフォーカスの調整に使いながら、広角端から少し望遠側によったズームポジションの非点収差を良好にし、緩やかでスムーズなカム形状を実現する為の条件である。条件式（２）の上限を超えて数値が大きくなると、広角端において第３レンズ群Ｇ３、第４レンズ群Ｇ４群のズーム倍率が等倍に近くなりすぎ、第３レンズ群Ｇ３、第４レンズ群Ｇ４によってバックフォーカスを長くする事が出来ない上に、広角端から少し望遠側によったポジションの非点収差が補正過剰になってしまうと言う光学性能上の問題が生じる。   Conditional expression (2) is the astigmatism of the zoom position slightly on the telephoto side from the wide-angle end while using the third lens group G3 and the fourth lens group G4 for back focus adjustment in the zoom lens of the present invention. This is a condition for improving the aberration and realizing a gentle and smooth cam shape. When the numerical value increases beyond the upper limit of conditional expression (2), the zoom magnifications of the third lens group G3 and the fourth lens group G4 group become too close to the same magnification at the wide angle end, and the third lens group G3 and the fourth lens. There is a problem in optical performance that the back focus cannot be lengthened by the group G4 and the astigmatism at the position on the telephoto side from the wide angle end is overcorrected.

逆に下限を超えてβ３，４Ｗ、β３，４Ｔが小さくなると、スムーズなカム形状を得るには良いが、広角端における非点収差の補正と、全長をコンパクトにする事が困難になり、特に望遠端でのレンズ全長が大きくなってしまう。   Conversely, if β3, 4W and β3, 4T become smaller than the lower limit, it is good to obtain a smooth cam shape, but it becomes difficult to correct astigmatism at the wide-angle end and to make the total length compact. The total lens length at the telephoto end becomes large.

条件式（３）は、２群のカム筒にフォーカスの補正カムを切る際、広角端における第１レンズ群Ｇ１のレンズの位置と収差補正をバランスさせる為に必要な条件である。条件式（３）の上限を超えると、ｒ５面の曲率半径が小さくなるので、広い画角の光線をスムーズに曲げる事が出来るが、これはズーム全域において球面収差、非点収差の補正を有利にし、全体の光学性能の向上に好ましい反面、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間隔が狭くなり過ぎて、フォーカスのための補正カムを切る事が出来ない不具合が生じる。逆に下限を超えると、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間隔が広くなり、鏡筒設計上有利である反面、光学性能の面で好ましくない。   Conditional expression (3) is a condition necessary for balancing the lens position and aberration correction of the first lens group G1 at the wide-angle end when the focus correction cam is cut in the second group of cam barrels. If the upper limit of conditional expression (3) is exceeded, the radius of curvature of the r5 surface will be small, so light rays with a wide angle of view can be bent smoothly, but this is advantageous for correcting spherical aberration and astigmatism over the entire zoom range. On the other hand, although it is preferable for improving the overall optical performance, the distance between the first lens group G1 and the second lens group G2 becomes too narrow, and there is a problem that the correction cam for focusing cannot be cut. On the contrary, if the lower limit is exceeded, the distance between the first lens group G1 and the second lens group G2 becomes wide, which is advantageous in terms of lens barrel design, but is not preferable in terms of optical performance.

条件式（４）は優れた光学性能を保ちながら高変倍率化を実現するのに欠かす事の出来ない条件であり、第３レンズ群Ｇ３と第４レンズ群Ｇ４のパワーを適切な関係にする事によって、良好な光学性能と加工し易い製造公差を実現させる事が可能になる。上限を超えると第４レンズ群Ｇ４のパワーが強くなりコンパクト化するには良いが、広角端においてバックフォーカスが不足する事態が生じ、また、第４レンズ群Ｇ４のパワーが強くなると広角端の周辺部の性能劣化が顕著になり好ましくない。   Conditional expression (4) is a condition indispensable for realizing a high zoom ratio while maintaining excellent optical performance. The power of the third lens group G3 and the fourth lens group G4 is appropriately related. This makes it possible to achieve good optical performance and easy manufacturing tolerances. If the upper limit is exceeded, the power of the fourth lens group G4 becomes strong and good for downsizing, but a situation occurs where the back focus is insufficient at the wide angle end, and when the power of the fourth lens group G4 becomes strong, the periphery of the wide angle end is increased. This is not preferable because the performance deterioration of the part becomes remarkable.

逆に下限を超えると第４レンズ群Ｇ４のパワーが弱くなり、軸外性能を良好にできて、きき量も緩くする事が可能になるが、システムが大型化しコンパクトなレンズを実現するという当初の目的から外れる。また、第４レンズ群Ｇ４の外径が大きくなるので、第４レンズ群Ｇ４に導入した非球面レンズの製造が困難になり生産性が低下するので好ましくない。   On the contrary, if the lower limit is exceeded, the power of the fourth lens group G4 becomes weak, and it is possible to improve off-axis performance and loosen the amount of cracking, but initially the system becomes large and a compact lens is realized. Deviate from the purpose. Further, since the outer diameter of the fourth lens group G4 is increased, it is not preferable because it is difficult to manufacture the aspherical lens introduced into the fourth lens group G4, and the productivity is lowered.

本実施例は、ＡＰＳ−Ｃサイズのイメージセンサーを用いたデジタルカメラの広角と言う呼称に相応しい、ワイドの焦点距離１８ｍｍから７倍程度のズーム比を持ち、広角端でも充分なバックフォーカスを持つレンズを実現している。そして高度な収差補正と、製造し易さという両立が困難な課題を、以下の構成と条件を与えることにより解決した。   In this embodiment, a lens having a zoom ratio of about 7 times from a wide focal length of 18 mm, which is suitable for the name of a wide angle of a digital camera using an APS-C size image sensor, and having a sufficient back focus even at the wide angle end. Is realized. Then, the problem that is difficult to achieve both high aberration correction and ease of manufacture was solved by giving the following configurations and conditions.

以下に、本発明である高変倍率ズームレンズの数値実施例１、数値実施例２、数値実施例３を示す。数値実施例１、数値実施例２、数値実施例３において、ｆは焦点距離、ＦｎｏはＦナンバー、ωは半画角であり、ｒｉは物体側より順に第ｉ番目のレンズ面の曲率半径、ｄｉは物体側より順に第ｉ番目のレンズ厚および空気間隔、ｎｉ，ｖｉは各々物体側より順に第ｉ番目のレンズ屈折率とアッベ数である。   In the following, Numerical Example 1, Numerical Example 2, and Numerical Example 3 of the high variable magnification zoom lens according to the present invention are shown. In Numerical Example 1, Numerical Example 2, and Numerical Example 3, f is a focal length, Fno is an F number, ω is a half angle of view, ri is a radius of curvature of the i-th lens surface in order from the object side, di is the i-th lens thickness and air interval in order from the object side, and ni and vi are the i-th lens refractive index and Abbe number in order from the object side.

非球面形状を表す式は、光軸方向にｘ軸、光軸と垂直方向にｙ軸、近軸曲率半径をｒ、Ａ４，Ａ６，Ａ８，Ａ１０を各非球面係数、円錐係数をＡとしたとき、以下の式で表わされる。
ｘ＝（ｙ２／ｒ）／［１＋｛１−Ａ（ｙ２／ｒ２）｝１／２］＋Ａ４ｙ４＋Ａ６ｙ６＋Ａ８ｙ８＋Ａ１０ｙ１０ The aspherical shape is expressed by an x-axis in the optical axis direction, a y-axis in the direction perpendicular to the optical axis, a paraxial radius of curvature r, A4, A6, A8, and A10 each aspheric coefficient, and a conic coefficient A. Is represented by the following equation.
x = (y 2 / r) / [1+ {1-A (y 2 / r 2 )} 1/2 ] + A4y 4 + A6y 6 + A8y 8 + A10y 10

ｆ＝１８.７２〜４８.３２〜１２０.３８
Ｆｎｏ＝３.６２〜４.９８〜５.８０
ω＝３７.７°〜１５.７°〜６.５° f = 18.72 to 48.32 to 120.38
Fno = 3.62 to 4.98 to 5.80
ω = 37.7 ° to 15.7 ° to 6.5 °

ｉ ｒ ｄ ｎ ν
［１］ １１８.４０ １.７０ １.８４６６６ ２３.８
［２］ ６４.８５ ６.７０ １.４８７４９ ７０.４
［３］ −２７９.５３ ０.２０
［４］ ５３.６５ ４.４４ １.６５１６０ ５８.４
［５］ １７１.００ ２.１５
［６］ ４７.７８ ０.０８ １.５１８４０ ５２.１
［７］ ４４.７３ １.２０ １.８０４２０ ４６.５
［８］ １２.３０ ４.４５
［９］ −３５.６３ ０.９０ １.８０４２０ ４６.５
［１０］ ３５.７２ ０.６５
［１１］ ２１.１８ ４.２８ １.７４０７７ ２７.８
［１２］ −４１.５５ １.８８
［１３］ −１８.６４ ０.９０ １.８０４２０ ４６.５
［１４］ ８９.４４ ０.１５
［１５］ ４９０.９０ １.８０ １.７６１８２ ２６.６
［１６］ −４２.３３ １８.７２
［１７］ ０.００ １.３３
［１８］ ４７.９３ ２.２８ １.４８７４９ ７０.４
［１９］ −５５.８７ ０.１５
［２０］ ２９.６０ ３.１１ １.４９７００ ８１.６
［２１］−２０９.２８ ２.６７
［２２］ −２９.６７ １.００ １.８０６１０ ３３.３
［２３］−５４６.６８ ５.３０
［２４］ ６６.３６ ２.７８ １.５１６８０ ６４.２
［２５］ −４５.８２ ０.１５
［２６］ ３６.２２ ３.９３ １.４８７４９ ７０.４
［２７］−１０２.７４ ２.２０
［２８］ １６４.０９ ０.１５ １.５１８４０ ５２.１
［２９］ ２１１.６２ １.４８ １.８０６１０ ４０.７
［３０］ ２４.１５ １.２９
［３１］ ７７.５７ ３.７６ １.４８７４９ ７０.４
［３２］ −３４.１２ i r d n ν
[1] 118.40 1.70 1.84666 23.8
[2] 64.85 6.70 1.48749 70.4
[3] -279.53 0.20
[4] 53.65 4.44 1.65160 58.4
[5] 171.00 2.15
[6] 47.78 0.08 1.518840 52.1
[7] 44.73 1.20 1.80420 46.5
[8] 12.30 4.45
[9] -35.63 0.90 1.80420 46.5
[10] 35.72 0.65
[11] 21.18 4.28 1.74077 27.8
[12] -41.55 1.88
[13] -18.64 0.90 1.80420 46.5
[14] 89.44 0.15
[15] 490.90 1.80 1.76182 26.6
[16] -42.33 18.72
[17] 0.00 1.33
[18] 47.93 2.28 1.48749 70.4
[19] -55.87 0.15
[20] 29.60 3.11 1.49700 81.6
[21] -209.28 2.67
[22] -29.67 1.00 1.80610 33.3
[23] -546.68 5.30
[24] 66.36 2.78 1.551680 64.2
[25] -45.82 0.15
[26] 36.22 3.93 1.48749 70.4
[27] -102.74 2.20
[28] 164.09 0.15 1.5840 52.1
[29] 211.62 1.48 1.80610 40.7
[30] 24.15 1.29
[31] 77.57 3.76 1.48749 70.4
[32] -34.12

（非球面係数）
ｒ６
Ａ ＝ ０.６０４０００００Ｄ＋０１
Ａ４＝ −０.７１５４９０００Ｄ−０６
Ａ６＝ −０.４５２１２９００Ｄ−０７
Ａ８＝ ０.４４５４９０００Ｄ−０９
Ａ１０＝−０.１３８２４０００Ｄ−１１
ｒ２８
Ａ＝ −０.５１２８７０００Ｄ＋０３
Ａ４＝ −０.９７４４６０００Ｄ−０５
Ａ６＝ −０.７３８７５０００Ｄ−０７
Ａ８＝ ０.１２４１８０００Ｄ−０９
Ａ１０＝ ０.１１３２４４００Ｄ−１１ (Aspheric coefficient)
r6
A = 0.60400000D + 01
A4 = −0.71549000D−06
A6 = −0.42212900D−07
A8 = 0.44549000D-09
A10 = −0.13824000D-11
r28
A = −0.51287000D + 03
A4 = −0.97446000D−05
A6 = −0.73875000D−07
A8 = 0.12418000D-09
A10 = 0.1324400D-11

ｆ １８.７２ ４８.３２ １２０.３８
ｄ５ ２.１５ ２１.６５ ４２.９３
ｄ１６ １８.７２ ７.５９ １.３１
ｄ２３ ５.３０ １.７２ ０.７０ f 18.72 48.32 120.38
d5 2.15 21.65 42.93
d16 18.72 7.59 1.31
d23 5.30 1.72 0.70

（条件式）
（１） ｆＷ／ｆｂＷ ＝ ０.４９１
（２）β３，４Ｗ／β３，４Ｔ＝ ０.４４８
（３） ｒ５／ｄ５Ｗ ＝７９.５２７
（４） ｆ３／ｆ４ ＝ １.７４５ (Conditional expression)
(1) fW / fbW = 0.491
(2) β3, 4W / β3, 4T = 0.448
(3) r5 / d5W = 79.527
(4) f3 / f4 = 1.745

ｆ＝１８.７３〜４８.３３〜１２０.３８
Ｆｎｏ＝３.６６〜５.０７〜５.８４
ω＝３７.７°〜１５.９°〜６.５° f = 18.73 to 48.33 to 120.38
Fno = 3.66-5.07-5.84
ω = 37.7 ° to 15.9 ° to 6.5 °

ｉ ｒ ｄ ｎ ν
［１］ １４.６５ １.７０ １.８４６６６ ２３.８
［２］ ６３.６５ ７.２３ １.４８７４９ ７０.４
［３］ −１９６.４０ ０.１５
［４］ ４４.８５ ４.３４ １.６５１６０ ５８.４
［５］ ９３.５１ ２.１５
［６］ ５２.８４ ０.０８ １.５１８４０ ５２.１
［７］ ４８.４１ １.２０ １.８０４２０ ４６.５
［８］ １２.５８ ４.４１
［９］ −３３.４０ １.６０ １.８０４２０ ４６.５
［１０］ ３３.５５ ０.８５
［１１］ ２１.６８ ４.７０ １.７４０７７ ２７.８
［１２］ −３３.４７ １.８２
［１３］ −１７.７６ ０.９０ １.８０４２０ ４６.５
［１４］ ８０.８３ ０.１５
［１５］ ３１１.６２ １.７３ １.７６１８２ ２６.６
［１６］ −４９.８５ １７.２６
［１７］ ０.００ １.２５
［１８］ ４０.９１ ２.４２ １.４８７４９ ７０.４
［１９］ −４２.４３ ０.１５
［２０］ ３０.３４ ３.３４ １.４９７００ ８１.６
［２１］ −８４.６８ ２.３１
［２２］ −２９.４３ １.００ １.８０６１０ ３３.３
［２３］ ６０７.４４ ５.９２
［２４］ ６４.８６ ２.８３ １.５１６８０ ６４.２
［２５］ −４４.６０ ０.１８
［２６］ ４４.２７ ３.６３ １.４８７４９ ７０.４
［２７］ −９６.５５ ２.２０
［２８］ １５１.６８ ０.１５ １.５１８４０ ５２.１
［２９］ ２０６.３６ ２.２５ １.８０６１０ ４０.７
［３０］ ２４.１６ １.１７
［３１］ ６７.８８ ６.９４ １.４８７４９ ７０.４
［３２］ −４１.０３ i r d n ν
[1] 14.65 1.70 1.84666 23.8
[2] 63.65 7.23 1.48749 70.4
[3] -196.40 0.15
[4] 44.85 4.34 1.65160 58.4
[5] 93.51 2.15
[6] 52.84 0.08 1.5518 42.1
[7] 48.41 1.20 1.80420 46.5
[8] 12.58 4.41
[9] -33.40 1.60 1.80420 46.5
[10] 33.55 0.85
[11] 21.68 4.70 1.74077 27.8
[12] -33.47 1.82
[13] -17.76 0.90 1.80420 46.5
[14] 80.83 0.15
[15] 311.62 1.73 1.76182 26.6
[16] -49.85 17.26
[17] 0.00 1.25
[18] 40.91 2.42 1.48749 70.4
[19] -42.43 0.15
[20] 30.34 3.34 1.49700 81.6
[21] -84.68 2.31
[22] -29.43 1.00 1.80610 33.3
[23] 607.44 5.92
[24] 64.86 2.83 1.51680 64.2
[25] -44.60 0.18
[26] 44.27 3.63 1.48749 70.4
[27] -96.55 2.20
[28] 151.68 0.15 1.5840 52.1
[29] 206.36 2.25 1.80610 40.7
[30] 24.16 1.17
[31] 67.88 6.94 1.48749 70.4
[32] -41.03

（非球面係数）
ｒ６
Ａ＝ ０.６０４１７０００Ｄ＋０１
Ａ４＝ ０.２１１５５１００Ｄ−０５
Ａ６＝ −０.１９５９２３００Ｄ−０７
Ａ８＝ ０.３１２７５１００Ｄ−０９
Ａ１０＝−０.１３８２３６００Ｄ−１１
ｒ２８
Ａ＝ −０.４１６９１４３０Ｄ＋０３
Ａ４＝ −０.１０２７３５００Ｄ−０４
Ａ６＝ −０.８１４６５５００Ｄ−０７
Ａ８＝ ０.３１２２７５００Ｄ−１０
Ａ１０＝ ０.１１６４１７００Ｄ−１１ (Aspheric coefficient)
r6
A = 0.6047000D + 01
A4 = 0.2155100D-05
A6 = −0.19592300D−07
A8 = 0.3275100D-09
A10 = −0.138223600D-11
r28
A = −0.41691430D + 03
A4 = −0.10273500D−04
A6 = −0.814665500D−07
A8 = 0.3227500D-10
A10 = 0.11641700D-11

ｆ １８.７３ ４８.３３ １２０.３８
ｄ５ ２.１５ ２１.８２ ４２.０４
ｄ１６ １７.２６ ６.９２ １.３８
ｄ２３ ５.９２ １.８０ ０.７０ f 18.73 48.33 120.38
d5 2.15 21.82 42.04
d16 17.26 6.92 1.38
d23 5.92 1.80 0.70

（条件式）
（１） ｆＷ／ｆｂＷ ＝ ０.５５０
（２）β３，４Ｗ／β３，４Ｔ＝ ０.４５４
（３） ｒ５／ｄ５Ｗ ＝４３.５０２
（４） ｆ３／ｆ４ ＝ １.２０８ (Conditional expression)
(1) fW / fbW = 0.550
(2) β3,4W / β3,4T = 0.454
(3) r5 / d5W = 43.502
(4) f3 / f4 = 1.208

ｆ＝１９.０３〜４８.２９〜１１８.９５
Ｆｎｏ＝３.７０〜５.０６〜５.８２
ω＝３７.３°〜１５.８°〜６.６° f = 19.03-48.29-118.95
Fno = 3.70-5.06-5.82
ω = 37.3 ° to 15.8 ° to 6.6 °

ｉ ｒ ｄ ｎ ν
［１］ １０５.０１ １.８１ １.８４６６６ ２３.８
［２］ ６１.４９ ６.６１ １.４８７４９ ７０.４
［３］ −４２３.６８ ０.１５
［４］ ５６.２０ ４.４０ １.６５１６０ ５８.４
［５］ １９９.７８ ２.１５
［６］ ４７.３１ ０.０８ １.５１８４０ ５２.１
［７］ ４３.５３ １.２０ １.８０４２０ ４６.５
［８］ １１.６０ ４.６５
［９］ −３４.５４ ０.９０ １.８０４２０ ４６.５
［１０］ ３４.７０ ０.１５
［１１］ ２０.０９ ４.２５ １.７４０７７ ２７.８
［１２］ −３４.３１ １.８９
［１３］ −１７.２２ ０.９０ １.８０４２０ ４６.５
［１４］−４４９.５６ ０.１５
［１５］ −８８.４３ １.５８ １.７６１８２ ２６.６
［１６］ −３４.４７ １９.９０
［１７］ ０.００ １.４２
［１８］ ６１.５６ ２.００ １.４８７４９ ７０.４
［１９］ −７５.１４ ０.１５
［２０］ ２５.３１ ２.０２ １.４９７００ ８１.６
［２１］ １６７.３０ ２.９０
［２２］ −２０.８１ １.００ １.８０６１０ ３３.３
［２３］ −４８.６８ ３.０７
［２４］ ５９.８９ ２.７７ １.５１６８０ ６４.２
［２５］ −４２.０８ ０.１５
［２６］ ６９.０２ ３.０８ １.４８７４９ ７０.４
［２７］ −３４.６７ ０.１５
［２８］ １５１.７６ ０.１５ １.５１８４０ ５２.１
［２９］ ２０８.２４ １.００ １.８０６１０ ４０.７
［３０］ ２４.１６ １.３５
［３１］ １３６.０６ ３.２３ １.４８７４９ ７０.４
［３２］ −３４.０５ i r d n ν
[1] 105.01 1.81 1.84666 23.8
[2] 61.49 6.61 1.48749 70.4
[3] -423.68 0.15
[4] 56.20 4.40 1.65160 58.4
[5] 199.78 2.15
[6] 47.31 0.08 1.551840 52.1
[7] 43.53 1.20 1.80420 46.5
[8] 11.60 4.65
[9] -34.54 0.90 1.80420 46.5
[10] 34.70 0.15
[11] 20.09 4.25 1.74077 27.8
[12] -34.31 1.89
[13] -17.22 0.90 1.80420 46.5
[14] -449.56 0.15
[15] -88.43 1.58 1.76182 26.6
[16] -34.47 19.90
[17] 0.00 1.42
[18] 61.56 2.00 1.48749 70.4
[19] -75.14 0.15
[20] 25.31 2.02 1.49700 81.6
[21] 167.30 2.90
[22] -20.81 1.00 1.80610 33.3
[23] -48.68 3.07
[24] 59.89 2.77 1.551680 64.2
[25] -42.08 0.15
[26] 69.02 3.08 1.48749 70.4
[27] -34.67 0.15
[28] 151.76 0.15 1.5840 52.1
[29] 208.24 1.00 1.80610 40.7
[30] 24.16 1.35
[31] 136.06 3.23 1.48749 70.4
[32] -34.05

（非球面係数）
ｒ６
Ａ＝ ０.６０４１７０００Ｄ＋０１
Ａ４＝ −０.８６００００８１Ｄ−０６
Ａ６＝ −０.３７９９３１２３Ｄ−０７
Ａ８＝ ０.４４００３９９７Ｄ−０９
Ａ１０＝−０.１３８２３６００Ｄ−１１
ｒ２８
Ａ＝ −０.４９７６３９４０Ｄ＋０３
Ａ４＝ −０.１０４２１０６３Ｄ−０４
Ａ６＝ −０.１３３３２３８３Ｄ−０６
Ａ８＝ ０.２４４５６９５３Ｄ−０９
Ａ１０＝ ０.１６５５３０８９Ｄ−１１ (Aspheric coefficient)
r6
A = 0.6047000D + 01
A4 = −0.86000081D−06
A6 = −0.37993123D-07
A8 = 0.44003997D-09
A10 = −0.138223600D-11
r28
A = −0.49763940D + 03
A4 = −0.10221063D−04
A6 = −0.13323833D−06
A8 = 0.24456953D-09
A10 = 0.16553089D-11

ｆ １９.０３ ４８.３２ １２０.３８
ｄ５ ２.１５ ２１.３３ ４３.０９
ｄ１６ １９.９０ ８.０４ １.２１
ｄ２３ ３.０７ １.０２ ０.７０ f 19.03 48.32 120.38
d5 2.15 21.33 43.09
d16 19.90 8.04 1.21
d23 3.07 1.02 0.70

（条件式）
（１） ｆＷ／ｆｂＷ ＝ ０.４２２
（２）β３，４Ｗ／β３，４Ｔ＝ ０.４６５
（３） ｒ５／ｄ５Ｗ ＝９２.８０７
（４） ｆ３／ｆ４ ＝ ２.５３０ (Conditional expression)
(1) fW / fbW = 0.422
(2) β3,4W / β3,4T = 0.465
(3) r5 / d5W = 92.807
(4) f3 / f4 = 2.530

数値実施例１のレンズ断面図である。2 is a lens cross-sectional view of Numerical Example 1. FIG. 数値実施例２のレンズ断面図である。6 is a lens cross-sectional view of Numerical Example 2. FIG. 数値実施例３のレンズ断面図である。10 is a lens cross-sectional view of Numerical Example 3. FIG. 数値実施例１の広角端の収差図である。FIG. 5 is an aberration diagram at the wide-angle end in Numerical Example 1. 数値実施例１の中間域の収差図である。FIG. 6 is an aberration diagram in an intermediate area in Numerical Example 1. 数値実施例１の望遠端の収差図である。FIG. 3 is an aberration diagram at the telephoto end in Numerical Example 1. 数値実施例２の広角端の収差図である。FIG. 6 is an aberration diagram at the wide-angle end in Numerical Example 2. 数値実施例２の中間域の収差図である。FIG. 6 is an aberration diagram in an intermediate area in Numerical Example 2. 数値実施例２の望遠端の収差図である。FIG. 10 is an aberration diagram at the telephoto end in Numerical Example 2. 数値実施例３の広角端の収差図である。FIG. 6 is an aberration diagram at the wide-angle end in Numerical Example 3. 数値実施例３の中間域の収差図である。FIG. 6 is an aberration diagram in an intermediate area in Numerical Example 3. 数値実施例３の望遠端の収差図である。FIG. 6 is an aberration diagram at the telephoto end in Numerical Example 3.

符号の説明Explanation of symbols

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 G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group

Claims (1)

物体側より順に第１レンズ群が正、第２レンズ群が負、第３レンズ群が正、第４レンズ群が正の屈折力を持つ４つのレンズ群で構成され、広角端から望遠端への変倍に際し、上記第１レンズ群と第２レンズ群との空気間隔を拡大させ、第２レンズ群と第３レンズ群との間隔を縮小させつつ、第１、第３、第４レンズ群が物体方向に移動し、フォーカシングは第２レンズ群を繰り出して行い、以下の条件式を満足することを特徴とする高変倍率ズームレンズ。
（１）０.４０＜ｆＷ／ｆｂＷ＜０.５５
（２）０.４３＜β３，４Ｗ／β３，４Ｔ＜０.４７
（３）４０＜ｒ５／ｄ５Ｗ＜１００
（４）１.１＜ｆ３／ｆ４＜２.６
但し、
ｆＷ：広角端の焦点距離
ｆｂＷ：広角端のバックフォーカス
β３，４Ｗ：第３，第４レンズ群の広角端の合成倍率
β３，４Ｔ：第３，第４レンズ群の望遠端の合成倍率
ｒ５：ｒ５面の曲率半径
ｄ５Ｗ：広角端の第１レンズ群と第２レンズ群のレンズ間隔
ｆ３：第３レンズ群の焦点距離
ｆ４：第４レンズ群の焦点距離 In order from the object side, the first lens group is positive, the second lens group is negative, the third lens group is positive, and the fourth lens group is composed of four lens groups having positive refractive power, from the wide-angle end to the telephoto end. In zooming, the first, third, and fourth lens groups are enlarged while the air gap between the first lens group and the second lens group is enlarged and the gap between the second lens group and the third lens group is reduced. Moves in the object direction, focusing is performed by extending the second lens group, and the following conditional expression is satisfied:
(1) 0.40 <fW / fbW <0.55
(2) 0.43 <β3, 4W / β3, 4T <0.47
(3) 40 <r5 / d5W <100
(4) 1.1 <f3 / f4 <2.6
However,
fW: Focal length at wide angle end fbW: Back focus at wide angle end β3, 4W: Composite magnification at wide angle end of third and fourth lens groups β3, 4T: Composite magnification at telephoto end of third and fourth lens groups r5: curvature radius d5W of r5 surface: lens interval between the first and second lens units at the wide angle end f3: focal length of the third lens unit f4: focal length of the fourth lens unit
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008152049A (en) * 2006-12-18 2008-07-03 Nikon Corp Zoom lens, imaging apparatus, vibration-proof method for zoom lens, and method for varying power of zoom lens
JP2008176230A (en) * 2007-01-22 2008-07-31 Matsushita Electric Ind Co Ltd Zoom lens system, imaging apparatus and camera
US7746563B2 (en) 2006-06-21 2010-06-29 Tamron Co., Ltd. Large magnification factor zoom lens
US8238038B2 (en) 2008-08-08 2012-08-07 Tamron Co., Ltd. High variable power zoom lens
US8451549B2 (en) 2010-05-24 2013-05-28 Tamron Co., Ltd. Enhanced variable power zoom lens
US8514496B2 (en) 2010-07-01 2013-08-20 Pentax Ricoh Imaging Company, Ltd. High zoom-ratio zoom lens system
US8542449B2 (en) 2010-05-24 2013-09-24 Tamron Co., Ltd Enhanced variable power zoom lens
US8553339B2 (en) 2010-05-24 2013-10-08 Tamron Co., Ltd. Enhanced variable power zoom lens
US9759801B2 (en) 2010-05-28 2017-09-12 Ricoh Imaging Company, Ltd. Method of automatically tracking and photographing celestial objects and photographic apparatus employing this method

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JPH02287414A (en) * 1989-04-28 1990-11-27 Konica Corp High variable power zoom lens for finite distance
JPH0720381A (en) * 1993-07-05 1995-01-24 Olympus Optical Co Ltd Variable power lens
JP2002098895A (en) * 2000-09-25 2002-04-05 Olympus Optical Co Ltd Zoom lens having image blur correcting function

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JPH02287414A (en) * 1989-04-28 1990-11-27 Konica Corp High variable power zoom lens for finite distance
JPH0720381A (en) * 1993-07-05 1995-01-24 Olympus Optical Co Ltd Variable power lens
JP2002098895A (en) * 2000-09-25 2002-04-05 Olympus Optical Co Ltd Zoom lens having image blur correcting function

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7746563B2 (en) 2006-06-21 2010-06-29 Tamron Co., Ltd. Large magnification factor zoom lens
EP3139205A1 (en) 2006-06-21 2017-03-08 Tamron Co., Ltd. Large magnification factor zoom lens
JP2008152049A (en) * 2006-12-18 2008-07-03 Nikon Corp Zoom lens, imaging apparatus, vibration-proof method for zoom lens, and method for varying power of zoom lens
JP2008176230A (en) * 2007-01-22 2008-07-31 Matsushita Electric Ind Co Ltd Zoom lens system, imaging apparatus and camera
US8238038B2 (en) 2008-08-08 2012-08-07 Tamron Co., Ltd. High variable power zoom lens
US8400715B2 (en) 2008-08-08 2013-03-19 Tamron Co., Ltd. High variable power zoom lens
US8451549B2 (en) 2010-05-24 2013-05-28 Tamron Co., Ltd. Enhanced variable power zoom lens
US8542449B2 (en) 2010-05-24 2013-09-24 Tamron Co., Ltd Enhanced variable power zoom lens
US8553339B2 (en) 2010-05-24 2013-10-08 Tamron Co., Ltd. Enhanced variable power zoom lens
US9759801B2 (en) 2010-05-28 2017-09-12 Ricoh Imaging Company, Ltd. Method of automatically tracking and photographing celestial objects and photographic apparatus employing this method
US8514496B2 (en) 2010-07-01 2013-08-20 Pentax Ricoh Imaging Company, Ltd. High zoom-ratio zoom lens system

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