JP2019066654A

JP2019066654A - Zoom lens and imaging device

Info

Publication number: JP2019066654A
Application number: JP2017191751A
Authority: JP
Inventors: 裕一行田; Yuichi Gyoda
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2017-09-29
Filing date: 2017-09-29
Publication date: 2019-04-25
Anticipated expiration: 2037-09-29
Also published as: JP6991814B2

Abstract

【課題】小型で、全ズーム域において高い光学性能を有するズームレンズ及び撮像装置を実現すること。【解決手段】本発明のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群、負の屈折力の第３レンズ群、負の屈折力の第４レンズ群を有し、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズであって、前記第３レンズ群の焦点距離をｆ３、前記第４レンズ群の焦点距離をｆ４とするとき、０．８０＜ｆ３／ｆ４＜５．００の条件式を満たすことを特徴とする。【選択図】図１PROBLEM TO BE SOLVED: To realize a zoom lens and an image pickup device which are compact and have high optical performance in the entire zoom range. SOLUTION: The zoom lens of the present invention has a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens having a negative refractive power arranged in order from the object side to the image side. A zoom lens having a group, a fourth lens group having a negative refractive power, and changing the distance between adjacent lens groups during zooming, the focal distance of the third lens group being f3, and the focal point of the fourth lens group. When the distance is f4, it is characterized by satisfying the conditional expression of 0.80 <f3 / f4 <5.00. [Selection diagram] Fig. 1

Description

本発明は、ズームレンズ及び撮像装置に関する。 The present invention relates to a zoom lens and an imaging device.

近年、レンズ全長が短く、小型なズームレンズが要求されている。 In recent years, a compact zoom lens with a short total lens length has been required.

特許文献１には、物体側から像側へ順に配置された、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群、負の屈折力の第３レンズ群、負の屈折力の第４レンズ群からなり、第３レンズ群でフォーカシングを行う広角ズームレンズが開示されている。 In Patent Document 1, a first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, and negative refractive power arranged in order from the object side to the image side A wide-angle zoom lens is disclosed which comprises a fourth lens group of forces and performs focusing with the third lens group.

特開２０１６−１３３７６４号公報JP, 2016-133764, A

特許文献１に記載のレンズ構成のズームレンズをさらに小型化する場合、ズーミングに際しての歪曲収差の変動が大きくなる場合がある。そこで、小型で、収差変動も少ないズームレンズを実現するためには、各レンズ群、特に第４レンズ群のパワー配置をより適切に設定することが望まれる。 When the zoom lens having the lens configuration described in Patent Document 1 is further miniaturized, the variation of distortion during zooming may become large. Therefore, in order to realize a compact zoom lens with small aberration fluctuation, it is desirable to set the power arrangement of each lens group, in particular, the fourth lens group more appropriately.

そこで本発明は、小型で、全ズーム域において高い光学性能を有するズームレンズ及び撮像装置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 zoom lens and an imaging device which are compact and have high optical performance in the entire zoom range.

本発明のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群、負の屈折力の第３レンズ群、負の屈折力の第４レンズ群を有し、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズであって、前記第３レンズ群の焦点距離をｆ３、前記第４レンズ群の焦点距離をｆ４とするとき、
０．８０＜ｆ３／ｆ４＜５．００
の条件式を満たすことを特徴とする。 The zoom lens according to the present invention includes a first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, and a negative lens, which are disposed in order from the object side to the image side. A zoom lens having a fourth lens unit having a refractive power and changing an interval between adjacent lens units during zooming, wherein a focal length of the third lens unit is f3 and a focal distance of the fourth lens unit is f4. and when,
0.80 <f3 / f4 <5.00
It is characterized by satisfying the following conditional expression.

本発明によれば、小型で、全ズーム域において高い光学性能を有するズームレンズ及び撮像装置を実現することができる。 According to the present invention, it is possible to realize a compact zoom lens and an imaging device having high optical performance in the entire zoom range.

実施例１のズームレンズの断面図である。FIG. 2 is a cross-sectional view of the zoom lens of Example 1; 実施例１のズームレンズの収差図である。5 is an aberration diagram of the zoom lens of Example 1. FIG. 実施例２のズームレンズの断面図である。FIG. 7 is a cross-sectional view of the zoom lens of Example 2; 実施例２のズームレンズの収差図である。5 is an aberration diagram of a zoom lens of Example 2. FIG. 実施例３のズームレンズの断面図である。FIG. 7 is a cross-sectional view of the zoom lens of Example 3; 実施例３のズームレンズの収差図である。FIG. 7 is an aberration diagram of a zoom lens of Example 3. 実施例４のズームレンズの断面図である。FIG. 14 is a cross-sectional view of the zoom lens of Example 4; 実施例４のズームレンズの収差図である。FIG. 7 is an aberration diagram of a zoom lens of Example 4. 実施例５のズームレンズの断面図である。FIG. 18 is a cross-sectional view of the zoom lens of Example 5. 実施例５のズームレンズの収差図である。FIG. 18 shows aberration diagrams of the zoom lens of Example 5. 実施例６のズームレンズの断面図である。FIG. 18 is a cross-sectional view of the zoom lens of Example 6; 実施例６のズームレンズの収差図である。FIG. 18 shows aberration diagrams of the zoom lens of Example 6. 撮像装置の構成を示す図である。It is a figure showing composition of an imaging device.

以下、本発明の実施例に係るズームレンズ及び撮像装置について、添付の図面に基づいて詳細に説明する。 Hereinafter, a zoom lens and an imaging device according to an embodiment of the present invention will be described in detail based on the attached drawings.

［ズームレンズの実施例］
各実施例のズームレンズは、ビデオカメラやデジタルカメラ、銀塩フィルムカメラ、テレビカメラ等の撮像装置に用いられる撮影光学系である。図１、３、５、７、９、１１に示すズームレンズの断面図において、左方が物体側（前方）であり、右方が像側（後方）である。また各断面図において、ｉを物体側から像側へのレンズ群の順番とすると、Ｌｉは第ｉレンズ群を示す。また、開口絞りＳＰは、開放Ｆナンバー（Ｆｎｏ）の光束を決定（制限）し、可変絞りＳＳＰは、ズーミングに際して口径が変化する。 [Example of zoom lens]
The zoom lens of each embodiment is a photographing optical system used for an imaging device such as a video camera, a digital camera, a silver halide film camera, a television camera and the like. In the sectional views of the zoom lens shown in FIGS. 1, 3, 5, 7, 9, 11, the left side is the object side (front) and the right side is the image side (rear). In each sectional view, Li represents the i-th lens group, where i is the order of the lens groups from the object side to the image side. Further, the aperture stop SP determines (limits) the light flux of the open F number (Fno), and the variable stop SSP changes its aperture during zooming.

ビデオカメラやデジタルカメラなどの撮像装置に各実施例のズームレンズを使用する場合は、像面ＩＰは、ＣＣＤセンサまたはＣＭＯＳセンサ等の固体撮像素子（光電変換素子）に相当する。銀塩フィルムカメラの撮像装置に各実施例のズームレンズを使用する場合は、像面ＩＰはフィルム面に相当する。 When the zoom lens of each embodiment is used in an imaging device such as a video camera or a digital camera, the image plane IP corresponds to a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor. When the zoom lens of each embodiment is used in an imaging device of a silver-halide film camera, the image plane IP corresponds to the film plane.

広角端から望遠端へのズーミングに際して、各レンズ群は、図中の実線矢印に示すように移動する。無限遠から至近距離へのフォーカシングに際して、フォーカスレンズ群は、図中の破線矢印に示すように移動する。 During zooming from the wide-angle end to the telephoto end, each lens unit moves as indicated by a solid arrow in the drawing. At the time of focusing from infinity to a close distance, the focusing lens unit moves as indicated by a broken arrow in the drawing.

球面収差図においてＦｎｏはＦナンバーであり、実線はｄ線（波長５８７．６ｎｍ）、二点鎖線はｇ線（波長４３５．８ｎｍ）に対する球面収差を示している。非点収差図において実線Ｓはサジタル像面、破線Ｍはメリディオナル像面である。歪曲収差はｄ線について示している。色収差図はｇ線における色収差を示している。ωは半画角（角度）である。 In the spherical aberration diagram, Fno is the F number, the solid line is the d-line (wavelength 587.6 nm), and the two-dot chain line is the spherical aberration for the g-line (wavelength 435.8 nm). In the astigmatism diagram, a solid line S is a sagittal image plane, and a broken line M is a meridional image plane. The distortion is shown for d-line. The chromatic aberration diagram shows the chromatic aberration at g-line. ω is a half angle of view (angle).

「広角端」と「望遠端」は、それぞれ、各レンズ群が機構的に移動可能な範囲の両端に位置したときのズーム位置をいう。 The “wide-angle end” and the “telephoto end” refer to zoom positions when the respective lens units are positioned at both ends of the mechanically movable range.

本発明のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群、負の屈折力の第３レンズ群、負の屈折力の第４レンズ群を有する。そして、ズーミングに際して、隣り合うレンズ群の間隔が変化する。各レンズ群は、１枚以上のレンズを有していればよく、複数枚のレンズを有していなくてもよい。 The zoom lens according to the present invention includes a first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, and a negative lens, which are disposed in order from the object side to the image side. It has a fourth lens group of refractive power. Then, during zooming, the distance between adjacent lens groups changes. Each lens group may have one or more lenses, and may not have a plurality of lenses.

広角端から望遠端へのズーミングに際して、第１レンズ群と第２レンズ群の間隔が狭まり、第２レンズ群と第３レンズ群の間隔が広がることにより、変倍作用が生じる。また、ズーミングに際して第３レンズ群と第４レンズ群の間隔が変化することにより、広角端から望遠端にかけて非点収差が補正される。 During zooming from the wide-angle end to the telephoto end, the distance between the first lens unit and the second lens unit is narrowed, and the distance between the second lens unit and the third lens unit is increased, which causes a zooming operation. In addition, the astigmatism is corrected from the wide-angle end to the telephoto end by changing the distance between the third lens unit and the fourth lens unit during zooming.

各実施例のズームレンズは条件式（１）を満たす。
０．８０＜ｆ３／ｆ４＜５．００・・・（１） The zoom lens of each embodiment satisfies the conditional expression (1).
0.80 <f3 / f4 <5.00 (1)

ただし、第３レンズ群の焦点距離をｆ３、第４レンズ群の焦点距離をｆ４とする。 However, the focal length of the third lens group is f3, and the focal length of the fourth lens group is f4.

条件式（１）は、第３レンズ群の焦点距離と第４レンズ群の焦点距離の比に関する。一般に、広角ズームレンズや、バックフォーカスの短いズームレンズでは、広角端から望遠端へのズーミングに際して、第４レンズ群に入射する軸外光線の入射高さの変動が大きくなる。また、第４レンズ群の屈折力が大きくなるほど入射高さの変動に応じた像面湾曲や非点収差の変動が大きくなる。したがって、条件式（１）の上限値を上回って第４レンズ群の焦点距離が短くなると、すなわち第４レンズ群の屈折力が大きくなると、像面湾曲および非点収差の変動が大きくなり、ズーム全域で高い光学性能を有することが困難になるため好ましくない。また、条件式（１）の下限値を下回って第４レンズ群の焦点距離が長くなると、ズームレンズの全長が長くなってしまうため、ズームレンズの小型化が困難になるため好ましくない。 Condition (1) relates to the ratio of the focal length of the third lens unit to the focal length of the fourth lens unit. Generally, in a wide-angle zoom lens or a zoom lens with a short back focus, the fluctuation of the incident height of the off-axis ray incident on the fourth lens group becomes large during zooming from the wide-angle end to the telephoto end. Further, as the refractive power of the fourth lens group becomes larger, the fluctuation of curvature of field and astigmatism according to the fluctuation of the incident height becomes larger. Therefore, if the focal length of the fourth lens group becomes short by exceeding the upper limit value of the conditional expression (1), that is, the refractive power of the fourth lens group becomes large, the fluctuation of the curvature of field and the astigmatism becomes large, and the zoom It is not preferable because it becomes difficult to have high optical performance over the entire area. Further, if the focal length of the fourth lens group is increased below the lower limit value of the conditional expression (1), the total length of the zoom lens is increased, which is not preferable because downsizing of the zoom lens becomes difficult.

したがって、小型で、全ズーム域において高い光学性能を得られる、ズームレンズを実現できる。 Therefore, it is possible to realize a compact zoom lens that can obtain high optical performance in the entire zoom range.

さらに、ズームレンズは条件式（２）〜（６）のうち少なくとも１つを満足することが好ましい。
０．３０＜ｆ２／｜ｆ４｜＜３．００・・・（２）
０．５０＜｜ｍ２｜／ｆｗ＜１．４０・・・（３）
０．５０＜｜ｆ１｜／ｆ２＜２．００・・・（４）
ｆｔ／ｆｗ＞１．８０・・・（５）
１．００＜｜ｆ４｜／ｆｗ＜４．５０・・・（６） Furthermore, it is preferable that the zoom lens satisfy at least one of the conditional expressions (2) to (6).
0.30 <f2 / | f4 | <3.00 (2)
0.50 <| m2 | / fw <1.40 (3)
0.50 <| f1 | / f2 <2.00 (4)
ft / fw> 1.80 (5)
1.00 <| f4 | / fw <4.50 (6)

ただし、第１レンズ群の焦点距離をｆ１、第２レンズ群の焦点距離をｆ２、広角端から望遠端へのズーミングにおける第２レンズ群の移動量をｍ２、ズームレンズの広角端における焦点距離をｆｗ、ズームレンズの望遠端における焦点距離をｆｔとする。なお、レンズ群の移動量とは、広角端におけるレンズ群の光軸上の位置と望遠端におけるレンズ群の光軸上の位置との差をいう。レンズ群の移動量の符号は、広角端に比べて望遠端において像側に位置するときを正、広角端に比べて望遠端において物体側に位置するときを負とする。 However, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the amount of movement of the second lens group during zooming from the wide-angle end to the telephoto end is m2, and the focal length at the wide-angle end of the zoom lens is The focal length at the telephoto end of the zoom lens is ft. The amount of movement of the lens unit refers to the difference between the position on the optical axis of the lens unit at the wide angle end and the position on the optical axis of the lens unit at the telephoto end. The sign of the amount of movement of the lens unit is positive when the lens unit is positioned on the image side at the telephoto end compared to the wide-angle end, and negative when it is positioned on the object side at the telephoto end compared to the wide-angle end.

次に、条件式（２）〜（６）の技術的意味について説明する。 Next, technical meanings of conditional expressions (2) to (6) will be described.

条件式（２）は、第２レンズ群の焦点距離と第４レンズ群の焦点距離との比に関する。条件式（２）の下限値を下回って第２レンズ群の焦点距離が第４レンズ群の焦点距離に対して短くなると、ズーム全域での球面収差およびコマ収差の変動が大きくなるため好ましくない。また、条件式（２）の上限値を下回って、第２レンズ群の焦点距離が第４レンズ群の焦点距離に対して長くなると、所定の変倍をするために必要な第２レンズ群の移動量が大きくなる。これにより光学系の小型化が困難になるため好ましくない。 Condition (2) relates to the ratio of the focal length of the second lens unit to the focal length of the fourth lens unit. If the focal length of the second lens group is smaller than the focal length of the fourth lens group below the lower limit value of the conditional expression (2), the variation of spherical aberration and coma aberration over the entire zoom range is increased. In addition, when the focal length of the second lens group becomes longer than the focal length of the fourth lens group below the upper limit value of the conditional expression (2), the second lens group necessary for performing predetermined magnification change. The amount of movement increases. This is not preferable because miniaturization of the optical system becomes difficult.

条件式（３）は、広角端から望遠端へのズーミングにおける第２レンズ群の移動量に関する。条件式（３）の下限値を下回って第２レンズ群の移動量が小さくなると、軸外光線が低い位置を通過する第２レンズ群の変倍分担が小さくなる。これにより、第２レンズ群よりも像側に配置されたレンズ群の変倍分担が大きくなると、当該レンズ群の変倍負担が小さい場合に比べて、ズーミングに際しての歪曲収差や像面湾曲の変動が大きくなり好ましくない。条件式（３）の上限値を上回って第２レンズ群の移動量が大きくなると、広角端において第１レンズ群と第２レンズ群の間隔を大きく確保する必要がある。これにより、光学系の小型化が困難になるため好ましくない。 Condition (3) relates to the amount of movement of the second lens unit in zooming from the wide-angle end to the telephoto end. If the amount of movement of the second lens unit decreases below the lower limit value of the conditional expression (3), the sharing of magnification change of the second lens unit in which the off-axis ray passes through the low position decreases. As a result, when the magnification sharing of the lens unit disposed on the image side of the second lens unit becomes larger, the variation of distortion and curvature of field during zooming as compared with the case where the magnification load of the lens unit is small. Is not preferable. When the moving amount of the second lens group becomes large beyond the upper limit value of the conditional expression (3), it is necessary to secure a large distance between the first lens group and the second lens group at the wide angle end. This is not preferable because miniaturization of the optical system becomes difficult.

条件式（４）は、第１レンズ群の焦点距離と第２レンズ群の焦点距離との比に関する。条件式（４）の下限値を下回って、第１レンズ群の焦点距離が第２レンズ群の焦点距離に対して短くなると、ズームレンズが小型になるものの、広角端における歪曲収差および非点収差が大きくなり好ましくない。条件式（４）の上限値を上回って第１レンズ群の焦点距離が第２レンズ群の焦点距離に対して長くなると、レンズ全長（最も物体側のレンズの物体側の面から像面までの距離）の短縮および第１レンズ群の小径化が困難になるため好ましくない。 Condition (4) relates to the ratio of the focal length of the first lens group to the focal length of the second lens group. If the focal length of the first lens group becomes shorter than the focal length of the second lens group below the lower limit value of conditional expression (4), the zoom lens becomes compact, but distortion and astigmatism at the wide-angle end Is not preferable. When the focal length of the first lens group becomes longer than the focal length of the second lens group by exceeding the upper limit value of the conditional expression (4), the entire lens length (from the object side surface of the lens closest to the object side to the image plane) This is not preferable because it becomes difficult to shorten the distance) and to reduce the diameter of the first lens unit.

条件式（５）は、各実施例のズームレンズの変倍比に関する。条件式（５）の下限を下回ると、ズーム比が小さくなりすぎて、ズームレンズとしての機能を発揮できず好ましくない。 The conditional expression (5) relates to the magnification ratio of the zoom lens of each embodiment. When the value goes below the lower limit of the conditional expression (5), the zoom ratio becomes so small that the function as a zoom lens can not be exhibited, which is not preferable.

条件式（６）は、第４レンズ群の焦点距離とズームレンズの広角端における焦点距離との比に関する。条件式（６）の下限値を下回って第４レンズ群の焦点距離がズームレンズの広角端における焦点距離に対して短くなると、ズーミングに際して軸外収差の変動の抑制が大きくなり好ましくない。条件式（６）の上限値を上回って第４レンズ群の焦点距離がズームレンズの広角端における焦点距離よりも長くなると、光学系の小型化が困難になるため好ましくない。 Condition (6) relates to the ratio of the focal length of the fourth lens unit to the focal length at the wide-angle end of the zoom lens. If the focal length of the fourth lens group is shorter than the lower limit value of the conditional expression (6) with respect to the focal length at the wide-angle end of the zoom lens, the fluctuation of off-axis aberration becomes large during zooming, which is not preferable. If the focal length of the fourth lens unit exceeds the upper limit value of the conditional expression (6) and becomes longer than the focal length at the wide-angle end of the zoom lens, it is not preferable because downsizing of the optical system becomes difficult.

また、第４レンズ群は、物体側に凹面を向けた負レンズを有することが好ましい。物体側に凹面があることにより、広角端において生じる像面湾曲と、望遠端において第２レンズ群より生じる球面収差とを補正をすることができる。 Preferably, the fourth lens group has a negative lens with a concave surface facing the object side. By having the concave surface on the object side, it is possible to correct curvature of field which occurs at the wide angle end and spherical aberration which occurs from the second lens unit at the telephoto end.

また、第４レンズ群の、物体側に凹面を向けた負レンズは、中心から周辺にかけて負の屈折力が強くなるような非球面形状を有することが好ましい。非球面形状を有することにより、球面形状を有する場合に比べて、広角端において生じる像面湾曲および非点収差を補正しやすくなる。 Further, it is preferable that the negative lens of the fourth lens group having a concave surface facing the object side has an aspheric shape such that the negative refractive power becomes stronger from the center to the periphery. Having an aspheric shape makes it easier to correct field curvature and astigmatism occurring at the wide-angle end, as compared to the case of having a spherical shape.

また、無限遠から至近距離へのフォーカシングに際して移動するフォーカスレンズ群は、比較的レンズの径が小さく且つレンズ枚数が少ない、第３レンズ群であることが好ましい。第３レンズ群でフォーカシングを行う場合は、他のレンズ群でフォーカシングを行う場合に比べて、フォーカスレンズ群を保持する鏡筒およびフォーカスレンズを駆動するための機構を小型化でき、ズームレンズの全系を小型化できる。さらに、フォーカスレンズ群は、正レンズおよび負レンズを少なくとも１枚ずつ有することが好ましい。正レンズおよび負レンズのいずれかのみで構成してしまうと、フォーカシング時の色収差変動を抑えることが困難になるため好ましくない。 Further, it is preferable that the focusing lens unit which moves during focusing from infinity to a close distance is the third lens unit having a relatively small diameter and a small number of lenses. When focusing is performed by the third lens unit, the lens barrel holding the focus lens unit and the mechanism for driving the focus lens can be miniaturized as compared to when focusing is performed by another lens unit, and the entire zoom lens can be manufactured. The system can be miniaturized. Furthermore, it is preferable that the focusing lens group have at least one positive lens and one negative lens. It is not preferable to make up only one of the positive lens and the negative lens, because it becomes difficult to suppress the chromatic aberration fluctuation at the time of focusing.

さらに、条件式（１）〜（６）の数値範囲を次のように設定することが好ましい。
０．８５＜ｆ３／ｆ４＜４．５０・・・（１ａ）
０．３３＜ｆ２／｜ｆ４｜＜２．００・・・（２ａ）
０．６０＜｜ｍ２｜／ｆｗ＜１．３６・・・（３ａ）
０．６０＜｜ｆ１｜／ｆ２＜１．８０・・・（４ａ）
ｆｔ／ｆｗ＞１．９０・・・（５ａ）
１．５０＜｜ｆ４｜／ｆｗ＜４．２０・・・（６ａ） Furthermore, it is preferable to set the numerical ranges of the conditional expressions (1) to (6) as follows.
0.85 <f3 / f4 <4.50 (1a)
0.33 <f2 / | f4 | <2.00 (2a)
0.60 <| m2 | / fw <1.36 (3a)
0.60 <| f1 | / f2 <1.80 (4a)
ft / fw> 1.90 ・・・ (5a)
1.50 <| f4 | / fw <4.20 (6a)

さらに、条件式（１ａ）〜（６ａ）の数値範囲を次のように設定することが好ましい。
０．９０＜ｆ３／ｆ４＜４．００・・・（１ｂ）
０．３５＜ｆ２／｜ｆ４｜＜１．００・・・（２ｂ）
０．７０＜｜ｍ２｜／ｆｗ＜１．３２・・・（３ｂ）
０．７０＜｜ｆ１｜／ｆ２＜１．６０・・・（４ｂ）
ｆｔ／ｆｗ＞２．００・・・（５ｂ）
２．００＜｜ｆ４｜／ｆｗ＜４．００・・・（６ｂ） Furthermore, it is preferable to set the numerical ranges of the conditional expressions (1a) to (6a) as follows.
0.90 <f3 / f4 <4.00 (1b)
0.35 <f2 / | f4 | <1.00 (2b)
0.70 <| m2 | / fw <1.32 (3b)
0.70 <| f1 | / f2 <1.60 (4b)
ft / fw> 2.00 ... (5b)
2.00 <| f4 | / fw <4.00 (6b)

［実施例１］
図１（ａ）と図１（ｂ）は、それぞれ、実施例１のズームレンズの広角端と望遠端における断面図である。図２（ａ）と図２（ｂ）は、それぞれ、実施例１のズームレンズの広角端と望遠端における収差図である。 Example 1
FIGS. 1A and 1B are cross-sectional views of the zoom lens of Embodiment 1 at the wide-angle end and the telephoto end, respectively. FIGS. 2A and 2B are aberration diagrams at the wide-angle end and the telephoto end, respectively, of the zoom lens of Embodiment 1. FIGS.

実施例１のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２、負の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４からなる。 The zoom lens according to Example 1 includes a first lens unit L1 of negative refractive power, a second lens unit L2 of positive refractive power, and a third lens unit of negative refractive power, which are disposed in order from the object side to the image side. It consists of a fourth lens unit L4 of negative refracting power L3.

第２レンズ群Ｌ２は、絞りＳＰおよび可変絞りＳＳＰを含む。第３レンズ群Ｌ３は、無限遠から至近距離へのフォーカシングに際して像側へ移動するフォーカスレンズ群である。第３レンズ群Ｌ３は、正レンズと、該正レンズの像側に配置された負レンズとの接合レンズからなる。第４レンズ群Ｌ４は、最も物体側に配置された、物体側に凹面を向け且つ像側に凸面を向けた負レンズＮＬを有する。負レンズＮＬは、中心から周辺にかけて負の屈折力が強くなるような非球面形状を有する。 The second lens unit L2 includes a stop SP and a variable stop SSP. The third lens unit L3 is a focusing lens unit that moves to the image side during focusing from infinity to a close distance. The third lens unit L3 includes a cemented lens of a positive lens and a negative lens disposed on the image side of the positive lens. The fourth lens unit L4 includes a negative lens NL disposed closest to the object side, having a concave surface facing the object and a convex surface facing the image. The negative lens NL has an aspherical shape such that the negative refractive power is strong from the center to the periphery.

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Ｌ１は像側へ移動し、第２レンズ群Ｌ２、第３レンズ群Ｌ３、および第４レンズ群Ｌ４は物体側へ移動する。また、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Ｌ１と第２レンズ群Ｌ２の間隔は狭まり、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔は広がり、第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔は狭まる。 During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the image side, and the second lens unit L2, the third lens unit L3, and the fourth lens unit L4 move to the object side. Further, during zooming from the wide-angle end to the telephoto end, the distance between the first lens unit L1 and the second lens unit L2 narrows, and the distance between the second lens unit L2 and the third lens unit L3 widens, and the third lens unit L3 and The distance between the fourth lens unit L4 is narrowed.

［実施例２］
図３（ａ）と図３（ｂ）は、それぞれ、実施例２のズームレンズの広角端と望遠端における断面図である。図４（ａ）と図４（ｂ）は、ぞれぞれ、実施例２のズームレンズの広角端と望遠端における収差図である。 Example 2
FIGS. 3A and 3B are cross-sectional views of the zoom lens of Embodiment 2 at the wide-angle end and the telephoto end, respectively. FIGS. 4A and 4B are aberration diagrams of the zoom lens of Embodiment 2 at the wide-angle end and at the telephoto end, respectively.

実施例２のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２、負の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４からなる。 The zoom lens of Example 2 includes a first lens unit L1 of negative refractive power, a second lens unit L2 of positive refractive power, and a third lens unit of negative refractive power, which are disposed in order from the object side to the image side. It consists of a fourth lens unit L4 of negative refracting power L3.

［実施例３］
図５（ａ）と図５（ｂ）は、それぞれ、実施例３のズームレンズの広角端と望遠端における断面図である。図６（ａ）と図６（ｂ）は、それぞれ、実施例３のズームレンズの広角端と望遠端における収差図である。 [Example 3]
FIGS. 5A and 5B are cross-sectional views of the zoom lens of Embodiment 3 at the wide-angle end and the telephoto end, respectively. FIGS. 6A and 6B are aberration diagrams at the wide-angle end and the telephoto end, respectively, of the zoom lens of Embodiment 3. FIGS.

実施例３のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２、負の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５からなる。 The zoom lens of Example 3 includes a first lens unit L1 of negative refractive power, a second lens unit L2 of positive refractive power, and a third lens unit of negative refractive power, which are disposed in order from the object side to the image side. It consists of L3, the 4th lens group L4 of negative refractive power, and the 5th lens group L5 of positive refractive power.

第２レンズ群Ｌ２は、絞りＳＰおよび可変絞りＳＳＰを含む。第３レンズ群Ｌ３は、正レンズと、該正レンズの像側に配置された負レンズとの接合レンズからなる。第３レンズ群Ｌ３は、無限遠から至近距離へのフォーカシングに際して像側へ移動するフォーカスレンズ群である。第４レンズ群Ｌ４は、最も物体側に配置された、物体側に凹面を向け且つ像側に凹面を向けた負レンズＮＬを有する。負レンズＮＬは、中心から周辺にかけて負の屈折力が強くなるような非球面形状を有する。 The second lens unit L2 includes a stop SP and a variable stop SSP. The third lens unit L3 includes a cemented lens of a positive lens and a negative lens disposed on the image side of the positive lens. The third lens unit L3 is a focusing lens unit that moves to the image side during focusing from infinity to a close distance. The fourth lens unit L4 includes a negative lens NL disposed closest to the object side, having a concave surface facing the object and a concave surface facing the image. The negative lens NL has an aspherical shape such that the negative refractive power is strong from the center to the periphery.

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Ｌ１は像側へ移動し、第２レンズ群Ｌ２、第３レンズ群Ｌ３、第４レンズ群Ｌ４、および第５レンズ群Ｌ５は物体側へ移動する。また、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Ｌ１と第２レンズ群ｌ２の間隔は狭まり、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔は広がり、第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔は狭まり、第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔は広がる。 During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the image side, and the second lens unit L2, the third lens unit L3, the fourth lens unit L4, and the fifth lens unit L5 move to the object side. Moving. During zooming from the wide-angle end to the telephoto end, the distance between the first lens unit L1 and the second lens unit 12 is narrowed, and the distance between the second lens unit L2 and the third lens unit L3 is increased. The distance between the fourth lens unit L4 is narrowed, and the distance between the fourth lens unit L4 and the fifth lens unit L5 is increased.

［実施例４］
図７（ａ）と図７（ｂ）は、それぞれ、実施例４のズームレンズの広角端と望遠端における断面図である。図８（ａ）と図８（ｂ）は、それぞれ、実施例４のズームレンズの広角端と望遠端における収差図である。 Example 4
FIGS. 7A and 7B are cross-sectional views of the zoom lens of Embodiment 4 at the wide-angle end and the telephoto end, respectively. FIGS. 8A and 8B are aberration diagrams at the wide-angle end and at the telephoto end of the zoom lens of Embodiment 4, respectively.

実施例４のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２、負の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４からなる。 The zoom lens according to Embodiment 4 includes a first lens unit L1 of negative refractive power, a second lens unit L2 of positive refractive power, and a third lens unit of negative refractive power, which are disposed in order from the object side to the image side. It consists of a fourth lens unit L4 of negative refracting power L3.

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Ｌ１は像側へ移動した後に物体側へ移動し、第２レンズ群Ｌ２、第３レンズ群Ｌ３、および第４レンズ群Ｌ４は物体側へ移動する。また、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Ｌ１と第２レンズ群Ｌ２の間隔は狭まり、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔は広がり、第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔は狭まる。 During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the image side and then moves to the object side, and the second lens unit L2, the third lens unit L3, and the fourth lens unit L4 move to the object side Moving. Further, during zooming from the wide-angle end to the telephoto end, the distance between the first lens unit L1 and the second lens unit L2 narrows, and the distance between the second lens unit L2 and the third lens unit L3 widens, and the third lens unit L3 and The distance between the fourth lens unit L4 is narrowed.

［実施例５］
図９（ａ）と図９（ｂ）は、それぞれ、実施例５のズームレンズの広角端と望遠端における断面図である。図１０（ａ）と図１０（ｂ）は、それぞれ、実施例５のズームレンズの広角端と望遠端における収差図である。 [Example 5]
FIGS. 9A and 9B are cross-sectional views of the zoom lens of Embodiment 5 at the wide-angle end and the telephoto end, respectively. FIGS. 10A and 10B are aberration diagrams at the wide-angle end and the telephoto end, respectively, of the zoom lens of Example 5. FIGS.

実施例５のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２、負の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５、正の屈折力の第６レンズ群Ｌ６からなる。 The zoom lens system of Example 5 includes, in order from the object side to the image side, a first lens unit L1 of negative refractive power, a second lens unit L2 of positive refractive power, and a third lens unit of negative refractive power. It comprises L3, a fourth lens unit L4 of negative refractive power, a fifth lens unit L5 of positive refractive power, and a sixth lens unit L6 of positive refractive power.

第２レンズ群Ｌ２は、絞りＳＰおよび可変絞りＳＳＰを含む。第３レンズ群Ｌ３は、無限遠から至近距離へのフォーカシングに際して像側へ移動するフォーカスレンズ群である。第３レンズ群Ｌ３は、正レンズと、該正レンズの像側に配置された負レンズとの接合レンズからなる。第４レンズ群Ｌ４は、最も物体側に配置された、物体側に凹面を向け且つ像側に凹面を向けた負レンズＮＬを有する。負レンズＮＬは、中心から周辺にかけて負の屈折力が強くなるような非球面形状を有する。 The second lens unit L2 includes a stop SP and a variable stop SSP. The third lens unit L3 is a focusing lens unit that moves to the image side during focusing from infinity to a close distance. The third lens unit L3 includes a cemented lens of a positive lens and a negative lens disposed on the image side of the positive lens. The fourth lens unit L4 includes a negative lens NL disposed closest to the object side, having a concave surface facing the object and a concave surface facing the image. The negative lens NL has an aspherical shape such that the negative refractive power is strong from the center to the periphery.

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Ｌ１は像側へ移動し、第２レンズ群Ｌ２、第３レンズ群Ｌ３、第４レンズ群Ｌ４、および第５レンズ群Ｌ５は物体側へ移動する。ズーミングに際して、第６レンズ群Ｌ６は不動である。また、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Ｌ１と第２レンズ群Ｌ２の間隔は狭まり、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔は広がり、第３レンズ群Ｌ３と第４レンズＬ４群の間隔は狭まり、第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔は広がり、第５レンズ群Ｌ５と第６レンズ群Ｌ６の間隔は広がる。 During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the image side, and the second lens unit L2, the third lens unit L3, the fourth lens unit L4, and the fifth lens unit L5 move to the object side. Moving. During zooming, the sixth lens unit L6 is stationary. Further, during zooming from the wide-angle end to the telephoto end, the distance between the first lens unit L1 and the second lens unit L2 narrows, and the distance between the second lens unit L2 and the third lens unit L3 widens, and the third lens unit L3 and The distance between the fourth lens L4 is smaller, the distance between the fourth lens L4 and the fifth lens L5 is larger, and the distance between the fifth lens L5 and the sixth lens L6 is larger.

［実施例６］
図１１（ａ）と図１１（ｂ）は、それぞれ、実施例６のズームレンズの広角端と望遠端における断面図である。図１２（ａ）と図１２（ｂ）は、それぞれ、実施例６のズームレンズの広角端と望遠端における収差図である。 [Example 6]
11A and 11B are cross-sectional views of the zoom lens of Embodiment 6 at the wide-angle end and at the telephoto end, respectively. FIGS. 12A and 12B are aberration diagrams at the wide-angle end and at the telephoto end of the zoom lens of Example 6, respectively.

実施例６のズームレンズは、物体側から像側へ順に配置された、負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２、負の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４からなる。 The zoom lens system of Example 6 includes, in order from the object side to the image side, a first lens unit L1 of negative refractive power, a second lens unit L2 of positive refractive power, and a third lens unit of negative refractive power. It consists of a fourth lens unit L4 of negative refracting power L3.

第２レンズ群Ｌ２は、絞りＳＰおよび可変絞りＳＳＰを含む。第３レンズ群Ｌ３と第４レンズ群Ｌ４は、無限遠から至近距離へのフォーカシングに際して、互いに異なる軌跡で像側へ移動するフォーカスレンズ群である。第３レンズ群Ｌ３の移動により合焦し、第４レンズ群の移動により像面湾曲の変化を補償する。 The second lens unit L2 includes a stop SP and a variable stop SSP. The third lens unit L3 and the fourth lens unit L4 are focusing lens units that move toward the image side along different trajectories when focusing from infinity to a close distance. Focusing is performed by the movement of the third lens unit L3, and a change in curvature of field is compensated by the movement of the fourth lens unit.

第３レンズ群Ｌ３は、正レンズと、該正レンズの像側に配置された負レンズとの接合レンズからなる。第４レンズ群Ｌ４は、最も物体側に配置された、物体側に凹面を向け且つ像側に凸面を向けた負レンズＮＬを有する。負レンズＮＬは、中心から周辺にかけて負の屈折力が強くなるような非球面形状を有する。 The third lens unit L3 includes a cemented lens of a positive lens and a negative lens disposed on the image side of the positive lens. The fourth lens unit L4 includes a negative lens NL disposed closest to the object side, having a concave surface facing the object and a convex surface facing the image. The negative lens NL has an aspherical shape such that the negative refractive power is strong from the center to the periphery.

以上、本発明の好ましい実施例について説明したが、本発明のズームレンズはこれらの実施例に限定されず、その要旨の範囲内で種々の変形および変更が可能である。例えば、ズームレンズのあるレンズ群の全部又は一部を防振レンズ群とし、防振目的で光軸に垂直な方向成分を有する方向に移動させてもよい。例えば、第２レンズ群の全部又は一部を防振レンズ群としてもよい。 Although the preferred embodiments of the present invention have been described above, the zoom lens of the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention. For example, all or part of a lens group having a zoom lens may be used as a vibration reduction lens group, and may be moved in a direction having a direction component perpendicular to the optical axis for the purpose of vibration reduction. For example, all or part of the second lens group may be used as a vibration reduction lens group.

本発明のズームレンズが、回折光学素子や反射光学部材を含んでいてもよい。 The zoom lens of the present invention may include a diffractive optical element or a reflective optical member.

［数値実施例］
以下に、実施例１〜６のそれぞれに対応する数値実施例１〜６を示す。数値実施例１〜６に関して、条件式（１）〜（６）に対応する数値を表１に示す。また、数値実施例１〜６において、ｉは物体側からの光学面の順序を示す。ｒは光学面の曲率半径、ｄは光学面の間隔、ｎｄとνｄはそれぞれｄ線に対する光学部材の材料の屈折率、アッベ数を示す。フラウンホーファー線のｇ線（波長４３５．８ｎｍ）、Ｆ線（４８６．１ｎｍ）、ｄ線（５８７．６ｎｍ）、Ｃ線（６５６．３ｎｍ）に対する材料の屈折率をそれぞれＮｇ、ＮＦ、Ｎｄ、ＮＣとする。そして、アッベ数νｄを、
νｄ＝（Ｎｄ−１）／（ＮＦ−ＮＣ）
として表す。ＢＦはバックフォーカスを示す。 [Numerical example]
Below, Numerical Examples 1-6 corresponding to each of Examples 1-6 are shown. Table 1 shows numerical values corresponding to the conditional expressions (1) to (6) regarding Numerical Embodiments 1 to 6. In Numerical Embodiments 1 to 6, i indicates the order of optical surfaces from the object side. r represents the radius of curvature of the optical surface, d represents the distance between the optical surfaces, and nd and d d represent the refractive index and Abbe's number of the material of the optical member with respect to the d-line. The refractive index of the material for Fraunhofer g-line (wavelength 435.8 nm), F-line (486.1 nm), d-line (587.6 nm), C-line (656.3 nm) is Ng, NF, Nd, NC respectively I assume. And Abbe number dd,
d d = (Nd-1) / (NF-NC)
Express as BF indicates back focus.

非球面は各数値実施例中の面番号の右側に＊印を付している。非球面形状は光軸方向にＸ軸、光軸と垂直方向にＨ軸、光の進行方向を正としＲを近軸曲率半径、Ｋを円錐定数、Ａ４、Ａ６、Ａ８、Ａ１０、Ａ１２、Ａ１４、Ａ１６をそれぞれ非球面係数としたとき、 The aspheric surface is indicated by * on the right side of the surface number in each numerical example. The aspheric surface shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the forward direction of light is positive, R is the paraxial radius of curvature, K is the conic constant, A4, A6, A8, A10, A12, A14 And A16 are respectively aspheric coefficients,

で表している。非球面係数の「ｅ−ｘ」は１０^−ｘを意味する。 Is represented by. The aspheric coefficient " ^ex " means 10-x.

また、前述の各条件式と実施例１〜６の関係をそれぞれ［表１］に示す。 Moreover, the relationship of each above-mentioned conditional expression and Examples 1-6 is shown in [Table 1], respectively.

［数値実施例１］
面データ
面番号 r d nd vd
1* 443.075 2.40 1.76450 49.1
2* 19.075 8.91
3 213.097 1.90 1.88300 40.8
4* 58.580 3.00
5 -309.039 1.50 1.59522 67.7
6 27.634 4.71 1.85478 24.8
7 229.654 (可変)
8(絞り) ∞ 1.50
9 32.245 0.80 2.00069 25.5
10 15.508 5.62 1.80100 35.0
11 -33.684 1.94
12 -24.367 0.80 2.00100 29.1
13 16.760 5.09 1.80810 22.8
14 -190.175 0.15
15 31.476 8.00 1.53775 74.7
16 -30.820 2.11
17 ∞ 1.00
18 24.403 0.90 2.00069 25.5
19 15.500 8.12 1.49700 81.5
20 -34.361 (可変)
21 -128.102 4.55 1.95906 17.5
22 -18.863 0.90 1.85478 24.8
23 131.391 (可変)
24 -18.030 1.10 1.85400 40.4
25* -96.237 2.47
26 46.162 7.92 1.51633 64.1
27 -71.414 (可変)
像面 ∞
非球面データ
第1面
K = 0.00000e+000 A 4= 7.47034e-005 A 6=-5.04678e-007 A 8= 2.47036e-009 A10=-7.40076e-012 A12= 1.31232e-014 A14=-1.28205e-017 A16= 5.38775e-021
第2面
K = 3.20613e-001 A 4= 5.78546e-005 A 6=-3.10160e-007 A 8=-1.05900e-009 A10= 2.00844e-011 A12=-6.89000e-014 A14= 4.01049e-017
第4面
K = 0.00000e+000 A 4= 1.43656e-005 A 6=-5.64042e-008 A 8= 7.58587e-010 A10=-7.88670e-012 A12= 4.07898e-014 A14=-6.60212e-017
第25面
K = 0.00000e+000 A 4= 3.65124e-005 A 6=-6.61865e-008 A 8= 1.11825e-009 A10=-7.36819e-012 A12= 1.65712e-014
各種データ
ズーム比 2.20
広角中間望遠
焦点距離 15.45 24.00 34.00
Ｆナンバー 4.12 4.12 4.12
半画角 54.47 42.03 32.47
像高 21.64 21.64 21.64
レンズ全長 125.38 119.21 116.89
BF 12.00 19.66 24.40
d 7 27.80 11.92 1.50
d20 1.00 1.89 5.83
d23 9.20 10.35 9.78
d27 12.00 19.66 24.40
レンズ群データ
群始面焦点距離レンズ構成長前側主点位置後側主点位置
1 1 -20.95 22.42 2.80 -14.45
2 8 23.98 36.04 17.89 -12.25
3 21 -117.83 5.45 0.63 -2.16
4 24 -60.24 11.48 -5.88 -15.46
単レンズデータ
レンズ始面焦点距離
1 1 -26.14
2 3 -92.02
3 5 -42.55
4 6 36.36
5 9 -30.59
6 10 13.97
7 12 -9.82
8 13 19.27
9 15 30.32
10 18 -44.71
11 19 22.72
12 21 22.60
13 22 -19.24
14 24 -26.15
15 26 55.58 Numerical Embodiment 1
Surface data surface number rd nd vd
1 * 443.075 2.40 1.76450 49.1
2 * 19.075 8.91
3 213.097 1.90 1.88300 40.8
4 * 58.580 3.00
5 -309.039 1.50 1.59522 67.7
6 27.634 4.71 1.85478 24.8
7 229.654 (variable)
8 (F-stop) ∞ 1.50
9 32.245 0.80 2.00069 25.5
10 15.508 5.62 1.80100 35.0
11-33.684 1.94
12 -24.367 0.80 2.00100 29.1
13 16.760 5.09 1.80810 22.8
14-190.175 0.15
15 31.476 8.00 1.53775 74.7
16-30.820 2.11
17 1.00
18 24.403 0.90 2.00069 25.5
19 15.500 8.12 1.49700 81.5
20-34. 361 (variable)
21-128.102 4.55 1.95906 17.5
22-18.863 0.90 1.85478 24.8
23 131.391 (variable)
24-18.030 1.10 1.85400 40.4
25 * -96.237 2.47
26 46.162 7.92 1.51633 64.1
27 -71.414 (variable)
Image plane ∞
Aspheric data first surface
K = 0.00000e + 000A 4 = 7.47034e-005 A 6 = -5.04678e-007 A 8 = 2.47036e-009 A10 = -7.40076e-012 A12 = 1.31232e-014 A14 = -1.28205e-017 A16 = 5.38775e-021
Second side
K = 3.20613e-001 A 4 = 5.78546e-005 A 6 =-3.10160e-007 A 8 =-1.05900e-009 A10 = 2.00844e-011 A12 =-6.89000e-014 A14 = 4.01049e-017
Fourth side
K = 0.00000e + 000 A 4 = 1.43656e-005 A 6 = -5.64042e-008 A 8 = 7.58587e-010 A10 = -7.88670e-012 A12 = 4.07898e-014 A14 = -6.60212e-017
25th
K = 0.00000e + 000A 4 = 3.65124e-005 A 6 =-6.61865e-008 A 8 = 1.11825e-009 A10 =-7.36819e-012 A12 = 1.65712e-014
Various data zoom ratio 2.20
Wide-angle Intermediate telephoto focal length 15.45 24.00 34.00
F number 4.12 4.12 4.12
Half angle of view 54.47 42.03 32.47
Image height 21.64 21.64 21.64
Total lens length 125.38 119.21 116.89
BF 12.00 19.66 24.40
d 7 27.80 11.92 1.50
d20 1.00 1.89 5.83
d23 9.20 10.35 9.78
d27 12.00 19.66 24.40
Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1 -20.95 22.42 2.80 -14.45
2 8 23.98 36.04 17.89-12.25
3 21 -117.83 5.45 0.63-2.16
4 24 -60.24 11.48 -5.88 -15.46
Single lens data lens Start surface Focal length
1 1 -26.14
2 3 -92.02
3 5-42.55
4 6 36.36
5 9-30.59
6 10 13.97
7 12-9. 82
8 13 19.27
9 15 30.32
10 18 -44.71
11 19 22.72
12 21 22.60
13 22-19.24
14 24 -26.15
15 26 55.58

［数値実施例２］
面データ
面番号 r d nd vd
1* 247.015 2.40 1.58313 59.4
2* 13.050 13.07
3* -6276.827 1.60 1.85400 40.4
4* 27.567 0.15
5 30.635 5.97 1.85025 30.1
6 -122.609 (可変)
7(絞り) ∞ 1.00
8 26.596 0.80 2.00069 25.5
9 15.122 5.41 1.57099 50.8
10 -23.330 1.86
11 -19.051 0.80 1.81600 46.6
12 18.177 5.02 1.69895 30.1
13 -37.957 0.15
14 27.397 8.01 1.49700 81.5
15 -36.437 0.50
16 ∞ 2.52
17 42.574 0.90 2.00069 25.5
18 16.711 7.29 1.49700 81.5
19 -26.555 (可変)
20 -222.963 4.21 1.95906 17.5
21 -19.664 0.90 1.85478 24.8
22 81.900 (可変)
23* -14.343 1.40 1.85400 40.4
24* -36.105 1.98
25 45.074 6.05 1.59522 67.7
26 -374.024 (可変)
像面 ∞
非球面データ
第1面
K = 0.00000e+000 A 4= 3.09710e-005 A 6=-1.18306e-007 A 8= 2.22994e-010 A10=-2.29635e-013 A12= 1.08049e-016
第2面
K =-3.49339e-001 A 4= 2.71331e-005 A 6=-9.25199e-009 A 8= 3.95060e-010 A10=-2.47967e-012 A12=-1.44412e-014
第3面
K = 0.00000e+000 A 4=-6.67663e-005 A 6= 8.24005e-007 A 8=-5.80766e-009 A10= 1.78105e-011 A12=-1.96528e-014
第4面
K = 0.00000e+000 A 4=-7.15502e-005 A 6= 8.47009e-007 A 8=-6.89293e-009 A10= 2.63995e-011 A12=-3.62274e-014
第23面
K = 0.00000e+000 A 4= 1.56019e-004 A 6=-7.83135e-007 A 8= 2.50495e-009
第24面
K = 0.00000e+000 A 4= 1.58125e-004 A 6=-1.01327e-006 A 8= 5.44478e-009 A10=-1.87942e-011 A12= 3.00531e-014
各種データ
ズーム比 2.06
広角中間望遠
焦点距離 16.48 24.00 34.00
Ｆナンバー 4.12 4.12 4.12
半画角 52.70 42.03 32.47
像高 21.64 21.64 21.64
レンズ全長 127.27 116.39 111.30
BF 10.95 16.82 23.58
d 6 32.68 14.85 1.98
d19 1.00 1.45 3.97
d22 10.67 11.31 9.80
d26 10.95 16.82 23.58
レンズ群データ
群始面焦点距離レンズ構成長前側主点位置後側主点位置
1 1 -28.60 23.18 -0.69 -21.43
2 7 25.14 34.25 16.53 -11.75
3 20 -105.52 5.11 1.69 -0.92
4 23 -54.88 9.42 -3.48 -10.43
単レンズデータ
レンズ始面焦点距離
1 1 -23.72
2 3 -32.14
3 5 29.35
4 8 -36.29
5 9 16.93
6 11 -11.29
7 12 18.26
8 14 32.83
9 17 -27.98
10 18 21.86
11 20 22.26
12 21 -18.48
13 23 -28.72
14 25 67.95 Numerical Embodiment 2
Surface data surface number rd nd vd
1 * 247.015 2.40 1.58313 59.4
2 * 13.050 13.07
3 *-6276.827 1.60 1.85400 40.4
4 * 27.567 0.15
5 30.635 5.97 1.85025 30.1
6-122.609 (variable)
7 (F-stop) ∞ 1.00
8 26. 596 0.80 2.00069 25.5
9 15.122 5.41 1.57099 50.8
10-23.330 1.86
11-19.051 0.80 1.81600 46.6
12 18.177 5.02 1.69895 30.1
13-37. 957 0.15
14 27.397 8.01 1.49700 81.5
15-36. 437 0.50
16 2.5 2.52
17 42.574 0.90 2.00069 25.5
18 16.711 7.29 1.49700 81.5
19-26.555 (variable)
20 -222.963 4.21 1.95906 17.5
21 -19.664 0.90 1.85478 24.8
22 81.900 (variable)
23 *-14.343 1.40 1.85400 40.4
24 * -36.105 1.98
25 45.074 6.05 1.59522 67.7
26 -374.024 (variable)
Image plane ∞
Aspheric data first surface
K = 0.00000e + 000 A 4 = 3.09710e-005 A 6 =-1.18306e-007 A 8 = 2.22299e-010 A10 =-2.29635e-013 A12 = 1.08049e-016
Second side
K = -3.49339e-001 A 4 = 2.71331e-005 A 6 =-9.25199e-009 A 8 = 3.95060e-010 A10 =-2.47967e-012 A12 =-1.44412e-014
Third side
K = 0.00000e + 000 A 4 = -6.67663e-005 A 6 = 8.24005e-007 A 8 =-5.80766e-009 A10 = 1.78105e-011 A12 =-1.96528e-014
Fourth side
K = 0.00000e + 000 A 4 = -7.15502e-005 A 6 = 8.47009e-007 A 8 =-6.8.9293e-009 A10 = 2.63995e-011 A12 =-3.62274e-014
23rd
K = 0.00000e + 000A 4 = 1.56019e-004 A 6 = -7.83135e-007 A 8 = 2.50495e-009
24th
K = 0.00000e + 000A 4 = 1.58125e-004 A 6 =-1.013227e-006 A 8 = 5. 44478e-009 A10 =-1.87942e-011 A12 = 3.00531e-014
Various data zoom ratio 2.06
Wide-angle Intermediate telephoto focal length 16.48 24.00 34.00
F number 4.12 4.12 4.12
Half angle of view 52.70 42.03 32.47
Image height 21.64 21.64 21.64
Lens total length 127.27 116.39 111.30
BF 10.95 16.82 23.58
d 6 32.68 14.85 1.98
d19 1.00 1.45 3.97
d22 10.67 11.31 9.80
d26 10.95 16.82 23.58
Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1 -28.60 23.18 -0.69 -21.43
2 7 25.14 34.25 16.53 -11.75
3 20 -105.52 5.11 1.69 -0.92
4 23 -54.88 9.42 -3.48-10.43
Single lens data lens Start surface Focal length
1 1-23.72
2 3 -32.14
3 5 29.35
4 8 -36.29
5 9 16.93
6 11 -11.29
7 12 18.26
8 14 32.83
9 17 -27.98
10 18 21.86
11 20 22.26
12 21 -18.48
13 23-28.72
14 25 67.95

［数値実施例３］
面データ
面番号 r d nd vd
1* ∞ 2.60 1.58313 59.4
2* 14.780 16.89
3* -97.231 2.20 1.85400 40.4
4* 51.561 0.15
5 41.160 7.43 1.85025 30.1
6 -120.385 (可変)
7* 36.166 2.80 1.90366 31.3
8 80.180 2.44
9(絞り) ∞ 1.50
10 44.417 1.20 2.00100 29.1
11 23.126 7.18 1.58144 40.8
12 -56.396 1.00
13 -172.570 1.10 1.90366 31.3
14 20.049 7.15 1.62588 35.7
15 -144.852 0.50
16 ∞ 0.50
17 20.888 1.20 2.00069 25.5
18 15.743 9.60 1.53775 74.7
19 -35.984 (可変)
20 -181.965 5.19 1.92286 18.9
21 -16.735 1.10 1.85478 24.8
22 49.274 (可変)
23* -910.168 1.40 1.85400 40.4
24* 49.564 (可変)
25 67.715 5.32 1.59522 67.7
26 -91.484 (可変)
像面 ∞
非球面データ
第1面
K = 0.00000e+000 A 4= 5.59540e-006 A 6=-7.47862e-009 A 8= 6.45924e-012 A10= 4.98794e-017 A12=-4.60087e-018 A14= 2.61073e-021
第2面
K =-9.91179e-001 A 4= 7.84626e-006 A 6= 2.78798e-008 A 8=-3.97631e-011 A10=-2.66363e-013 A12= 2.01313e-015 A14=-4.48748e-018
第3面
K = 0.00000e+000 A 4=-3.18404e-005 A 6= 1.99834e-007 A 8=-7.67005e-010 A10= 1.36846e-012 A12=-8.85293e-016 A14=-4.82404e-020
第4面
K = 0.00000e+000 A 4=-2.65798e-005 A 6= 2.31313e-007 A 8=-1.04271e-009 A10= 2.65040e-012 A12=-3.32254e-015 A14= 1.81391e-018
第7面
K = 0.00000e+000 A 4=-4.57237e-006 A 6= 4.70972e-009 A 8=-7.59429e-011 A10= 3.10858e-013 A12=-5.87762e-016
第23面
K = 0.00000e+000 A 4=-2.28188e-004 A 6= 1.15319e-006 A 8=-4.31694e-009 A10= 5.16688e-012
第24面
K = 0.00000e+000 A 4=-1.97807e-004 A 6= 1.42978e-006 A 8=-6.32435e-009 A10= 1.83189e-011 A12=-2.48009e-014
各種データ
ズーム比 2.20
広角中間望遠
焦点距離 15.45 24.00 34.00
Ｆナンバー 2.91 2.91 2.91
半画角 54.47 42.03 32.47
像高 21.64 21.64 21.64
レンズ全長 145.57 128.97 124.36
BF 13.00 18.88 27.25
d 6 41.03 15.48 0.78
d19 1.00 2.63 4.43
d22 11.29 9.66 7.85
d24 0.80 3.86 5.59
d26 13.00 18.88 27.25
レンズ群データ
群始面焦点距離レンズ構成長前側主点位置後側主点位置
1 1 -30.20 29.27 -1.13 -28.11
2 7 27.66 36.17 17.15 -14.25
3 20 -53.93 6.29 2.48 -0.77
4 23 -55.00 1.40 0.72 -0.04
5 25 66.20 5.32 1.44 -1.94
単レンズデータ
レンズ始面焦点距離
1 1 -25.35
2 3 -39.19
3 5 36.85
4 7 70.77
5 10 -49.60
6 11 29.18
7 13 -19.82
8 14 28.62
9 17 -72.31
10 18 21.78
11 20 19.67
12 21 -14.50
13 23 -55.00
14 25 66.20 Numerical Embodiment 3
Surface data surface number rd nd vd
1 * 2. 2.60 1.58313 59.4
2 * 14.780 16.89
3 * -97.231 2.20 1.85400 40.4
4 * 51.561 0.15
5 41.160 7.43 1.85025 30.1
6 -120.385 (variable)
7 * 36.166 2.80 1.90366 31.3
8 80.180 2.44
9 (aperture) 1. 1.50
10 44.417 1.20 2.00100 29.1
11 23.126 7.18 1.58184 40.8
12 -56.396 1.00
13 -172.570 1.10 1.90366 31.3
14 20.049 7.15 1.62588 35.7
15-144.852 0.50
16 0.50
17 20.888 1.20 2.00069 25.5
18 15.743 9.60 1.53775 74.7
19-35.984 (variable)
20 -181.965 5.19 1.92286 18.9
21 -16.735 1.10 1.85478 24.8
22 49.274 (variable)
23 * -910.168 1.40 1.85400 40.4
24 * 49.564 (variable)
25 67.715 5.32 1.59522 67.7
26 -91.484 (variable)
Image plane ∞
Aspheric data first surface
K = 0.00000e + 000A 4 = 5.59540e-006 A 6 = -7.47862e-009 A 8 = 6.45924e-012 A10 = 4.98794e-017 A12 = -4.60087e-018 A14 = 2.61073e-021
Second side
K = -9.91179e-001 A 4 = 7.84626e-006 A 6 = 2.78798e-008 A 8 =-3.97631e-011 A10 =-2.66363e-013 A12 = 2.01313e-015 A14 = -4.48748e-018
Third side
K = 0.00000e + 000 A 4 = -3.18404e-005 A 6 = 1.99834e-007 A 8 = -7.67005e-010 A10 = 1.36846e-012 A12 = -8.85293e-016 A14 = -4.82404e-020
Fourth side
K = 0.00000e + 000A 4 =-2.65798e-005 A 6 = 2.31313e-007 A 8 =-1.04271e-009 A10 = 2.65040e-012 A12 = -3.32254e-015 A14 = 1.81391e-018
Seventh side
K = 0.00000e + 000A 4 = -4.57237e-006 A 6 = 4.70972e-009 A 8 = -7.59429e-011 A10 = 3.10858e-013 A12 = -5.87762e-016
23rd
K = 0.00000e + 000 A 4 =-2. 2. 8188 e-004 A 6 = 1. 15 319 e-006 A 8 =-4. 3 16 4 4 e-009 A 10 = 5. 16 6 8 e
24th
K = 0.00000e + 000 A 4 = -1.97807e-004 A 6 = 1.42978e-006 A 8 =-6. 2435 e-009 A10 = 1.83189e-011 A12 =-2.48 009e-014
Various data zoom ratio 2.20
Wide-angle Intermediate telephoto focal length 15.45 24.00 34.00
F number 2.91 2.91 2.91
Half angle of view 54.47 42.03 32.47
Image height 21.64 21.64 21.64
Lens total length 145.57 128.97 124.36
BF 13.00 18.88 27.25
d 6 41.03 15.48 0.78
d19 1.00 2.63 4.43
d22 11.29 9.66 7.85
d24 0.80 3.86 5.59
d26 13.00 18.88 27.25
Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1 -30.20 29.27 -1.13 -28.11
2 7 27.66 36.17 17.15 -14.25
3 20 -53.93 6.29 2.48 -0.77
4 23-55.00 1.40 0.72-0.04
5 25 66.20 5.32 1.44-1.94
Single lens data lens Start surface Focal length
1 1-25.35
2 3 -39.19
3 5 36.85
4 7 70.77
5 10 -49.60
6 11 29.18
7 13-19.82
8 14 28.62
9 17-72.31
10 18 21.78
11 20 19.67
12 21-14.50
13 23-55.00
14 25 66.20

［数値実施例４］
面データ
面番号 r d nd vd
1* 143.340 2.40 1.58313 59.4
2* 11.994 12.00
3* -124.735 1.60 1.85400 40.4
4* 39.214 0.15
5 25.213 4.46 1.85478 24.8
6 178.652 (可変)
7(絞り) ∞ 1.00
8 26.889 0.80 2.00100 29.1
9 14.354 5.05 1.68893 31.1
10 -51.305 1.96
11 -35.445 0.80 1.95375 32.3
12 17.480 5.13 1.64769 33.8
13 -48.014 0.15
14 28.487 6.86 1.49700 81.5
15 -44.330 0.50
16 ∞ 1.00
17 28.013 0.90 2.00069 25.5
18 16.714 9.07 1.49700 81.5
19 -25.294 (可変)
20 -133.728 5.51 1.95906 17.5
21 -16.217 0.90 1.85478 24.8
22 77.056 (可変)
23* -18.950 1.40 1.85400 40.4
24* -70.869 3.27
25 44.895 5.45 1.61700 62.8
26 485.511 (可変)
像面 ∞
非球面データ
第1面
K = 0.00000e+000 A 4= 3.58873e-005 A 6=-1.23495e-007 A 8= 2.24426e-010 A10=-2.26306e-013 A12= 1.16852e-016
第2面
K =-5.82737e-001 A 4= 3.41563e-005 A 6= 1.71808e-007 A 8=-8.64499e-010 A10= 6.66511e-012 A12=-4.24157e-014
第3面
K = 0.00000e+000 A 4=-2.40460e-005 A 6= 4.91830e-007 A 8=-4.67545e-009 A10= 1.73591e-011 A12=-2.26114e-014
第4面
K = 0.00000e+000 A 4=-9.73262e-006 A 6= 4.69843e-007 A 8=-5.25301e-009 A10= 2.45506e-011 A12=-3.40969e-014
第23面
K = 0.00000e+000 A 4=-3.48655e-005 A 6= 3.83694e-007 A 8=-2.51596e-009
第24面
K = 0.00000e+000 A 4= 3.74319e-006 A 6= 3.92193e-007 A 8=-2.27991e-009 A10= 4.62071e-012 A12=-1.31306e-015
各種データ
ズーム比 2.06
広角中間望遠
焦点距離 16.48 24.00 34.00
Ｆナンバー 4.12 4.12 4.12
半画角 52.70 42.03 32.47
像高 21.64 21.64 21.64
レンズ全長 121.42 114.74 116.30
BF 12.00 19.01 28.83
d 6 27.27 13.10 4.39
d19 1.00 2.48 3.49
d22 10.81 9.80 9.23
d26 12.00 19.01 28.83
レンズ群データ
群始面焦点距離レンズ構成長前側主点位置後側主点位置
1 1 -23.16 20.61 1.48 -15.52
2 7 23.09 33.22 17.22 -9.83
3 20 -83.81 6.41 1.54 -1.71
4 23 -54.19 10.12 -2.98 -10.71
単レンズデータ
レンズ始面焦点距離
1 1 -22.60
2 3 -34.78
3 5 33.89
4 8 -31.78
5 9 16.81
6 11 -12.18
7 12 20.41
8 14 36.02
9 17 -43.13
10 18 21.81
11 20 18.81
12 21 -15.60
13 23 -30.67
14 25 79.80 Numerical Embodiment 4
Surface data surface number rd nd vd
1 * 143.340 2.40 1.58313 59.4
2 * 11.994 12.00
3 * -124.735 1.60 1.85400 40.4
4 * 39.214 0.15
5 25.213 4.46 1.85478 24.8
6 178.652 (variable)
7 (F-stop) ∞ 1.00
8 26.889 0.80 2.00100 29.1
9 14.354 5.05 1.68893 31.1
10-51.305 1.96
11-35.445 0.80 1.95375 32.3
12 17.480 5.13 1.64769 33.8
13-48.014 0.15
14 28.487 6.86 1.49700 81.5
15 -44.330 0.50
16 1.00
17 28.01 0.90 2.00069 25.5
18 16.714 9.07 1.49700 81.5
19-25. 294 (variable)
20 -133.728 5.51 1.95906 17.5
21 -16.217 0.90 1.85478 24.8
22 77.056 (variable)
23 * -18.950 1.40 1.85400 40.4
24 * -70.869 3.27
25 44.895 5.45 1.61700 62.8
26 485.511 (variable)
Image plane ∞
Aspheric data first surface
K = 0.00000e + 000 A 4 = 3.58873e-005 A 6 =-1.23495e-007 A 8 = 2.24426e-010 A10 =-2.26306e-013 A12 = 1.16852e-016
Second side
K = -5.82737e-001 A 4 = 3.41563e-005 A 6 = 1.71808e-007 A 8 = -8.64499e-010 A10 = 6.66511e-012 A12 =-4.24157e-014
Third side
K = 0.00000e + 000A 4 =-2. 40460e-005 A 6 = 4.91830e-007 A 8 =-4.67545e-009 A10 = 1.73591e-011 A12 =-2.26114e-014
Fourth side
K = 0.00000e + 000 A 4 = -9.73262e-006 A 6 = 4.69843e-007 A 8 =-5.25301e-009 A10 = 2.45506e-011 A12 =-3.40969e-014
23rd
K = 0.00000e + 000 A 4 = -3.48655e-005 A 6 = 3.836 4e-007 A 8 =-2.51596e-009
24th
K = 0.00000e + 000A 4 = 3.74319e-006 A 6 = 3.92193e-007 A 8 =-2.27991e-009 A10 = 4.62071e-012 A12 =-13.31306e-015
Various data zoom ratio 2.06
Wide-angle Intermediate telephoto focal length 16.48 24.00 34.00
F number 4.12 4.12 4.12
Half angle of view 52.70 42.03 32.47
Image height 21.64 21.64 21.64
Lens total length 121.42 114.74 116.30
BF 12.00 19.01 28.83
d 6 27.27 13.10 4.39
d19 1.00 2.48 3.49
d22 10.81 9.80 9.23
d26 12.00 19.01 28.83
Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1-23.16 20.61 1.48-15.52
2 7 23.09 33.22 17.22-9.83
3 20 -83.81 6.41 1.54 -1.71
4 23 -54.19 10.12-2.98-10.71
Single lens data lens Start surface Focal length
1 1 -22.60
2 3 -34.78
3 5 33.89
4 8-31.78
5 9 16.81
6 11-12.18
7 12 20.41
8 14 36.02
9 17 -43.13
10 18 21.81
11 20 18.81
12 21-15.60
13 23 -30.67
14 25 79.80

［数値実施例５］
単位 mm
面データ
面番号 r d nd vd 有効径
1* ∞ 2.60 1.69350 53.2 57.27
2* 18.329 12.12 42.02
3* ∞ 2.20 1.85400 40.4 40.00
4* 280.051 3.00 35.66
5 -78.143 1.40 1.61800 63.3 35.58
6 78.202 0.15 35.21
7 42.294 5.57 1.85478 24.8 35.57
8 451.582 (可変) 34.92
9* 68.407 3.01 1.80400 46.6 22.37
10 -140.601 8.97 22.58
11(絞り) ∞ 1.20 23.49
12 131.635 1.20 2.00100 29.1 23.66
13 26.824 5.85 1.80518 25.4 23.52
14 -117.449 1.00 23.67
15 -320.954 1.10 2.00069 25.5 23.59
16 27.085 6.17 1.51905 54.6 23.63
17 -50.121 0.50 24.29
18 ∞ 2.63 24.80
19 26.036 1.20 2.00100 29.1 26.32
20 18.097 9.41 1.65160 58.5 25.11
21 -45.022 (可変) 24.67
22 225.603 4.67 1.95906 17.5 21.81
23 -25.972 1.00 1.85478 24.8 21.61
24 30.023 (可変) 20.79
25* -229.622 1.40 1.85400 40.4 24.03
26 66.941 (可変) 26.10
27 48.941 4.94 1.59522 67.7 33.66
28 731.974 (可変) 34.54
29 -636.057 4.57 1.69680 55.5 39.26
30 -70.822 11.00 40.01
像面 ∞
非球面データ
第1面
K = 0.00000e+000 A 4= 6.87072e-006 A 6=-1.53892e-008 A 8= 3.02887e-011 A10=-2.50051e-014 A12= 7.56634e-018
第2面
K =-2.78028e+000 A 4= 3.07724e-005 A 6=-8.97150e-008 A 8= 8.71627e-011 A10=-7.10698e-014
第3面
K = 0.00000e+000 A 4=-5.74635e-005 A 6= 9.59268e-008 A 8= 2.36672e-010 A10=-8.05912e-013 A12= 6.16498e-016
第4面
K = 0.00000e+000 A 4=-4.50428e-005 A 6= 1.55564e-007 A 8=-8.76130e-012 A10=-1.15575e-013 A12= 1.92346e-016
第9面
K = 0.00000e+000 A 4=-4.99220e-006 A 6= 4.65954e-009 A 8=-1.91748e-011
第25面
K = 0.00000e+000 A 4=-2.71326e-005 A 6=-7.49757e-009 A 8=-4.82275e-010
各種データ
ズーム比 2.20
広角中間望遠
焦点距離 15.45 23.29 33.95
Ｆナンバー 2.92 2.92 2.92
半画角 54.47 42.89 32.51
像高 21.64 21.64 21.64
レンズ全長 152.24 136.06 133.89
BF 11.00 11.00 11.00
d 8 39.15 14.97 0.78
d21 1.00 5.25 8.38
d24 12.17 7.92 4.78
d26 1.50 5.82 6.86
d28 1.56 5.25 16.22
レンズ群データ
群始面焦点距離レンズ構成長前側主点位置後側主点位置
1 1 -26.42 27.05 1.29 -20.94
2 9 29.72 42.24 26.07 -16.65
3 22 -50.43 5.67 3.70 0.73
4 25 -60.56 1.40 0.58 -0.17
5 27 87.88 4.94 -0.22 -3.31
6 29 114.00 4.57 3.02 0.34
単レンズデータ
レンズ始面焦点距離
1 1 -26.43
2 3 -327.06
3 5 -63.03
4 7 54.25
5 9 57.61
6 12 -33.85
7 13 27.62
8 15 -24.92
9 16 34.83
10 19 -64.14
11 20 21.05
12 22 24.51
13 23 -16.16
14 25 -60.56
15 27 87.88
16 29 114.00 Numerical Embodiment 5
Unit mm
Surface data surface number rd nd vd effective diameter
1 * 2. 2.60 1.69350 53.2 57.27
2 * 18.329 12.12 42.02
3 * 2. 2.20 1.85400 40.4 40.00
4 * 280.051 3.00 35.66
5 -78.143 1.40 1.61800 63.3 35.58
6 78.202 0.15 35.21
7 42.294 5.57 1.85478 24.8 35.57
8 451.582 (variable) 34.92
9 * 68.407 3.01 1.80400 46.6 22.37
10 -140.601 8.97 22.58
11 (aperture) ∞ 1.20 23.49
12 131.635 1.20 2.00100 29.1 23.66
13 26.824 5.85 1.80518 25.4 23.52
14 -117.449 1.00 23.67
15 -320.954 1.10 2.00069 25.5 23.59
16 27.085 6.17 1.51905 54.6 23.63
17-50.121 0.50 24.29
18 2. 2.63 24.80
19 26.036 1.20 2.00100 29.1 26.32
20 18.097 9.41 1.65160 58.5 25.11
21-45.022 (variable) 24.67
22 225.603 4.67 1.95906 17.5 21.81
23-25.972 1.00 1.85478 24.8 21.61
24 30.023 (variable) 20.79
25 * -229.622 1.40 1.85400 40.4 24.03
26 66.941 (variable) 26.10
27 48.941 4.94 1.59522 67.7 33.66
28 731.974 (variable) 34.54
29-636.057 4.57 1.69680 55.5 39.26
30-70.822 11.00 40.01
Image plane ∞
Aspheric data first surface
K = 0.00000e + 000 A 4 = 6.87072e-006 A 6 = -1.53892e-008 A 8 = 3.02887e-011 A10 = -2.50051e-014 A12 = 7.56634e-018
Second side
K = -2.78028e + 000 A 4 = 3.07724e-005 A 6 = -8.971 50e-008 A 8 = 8.71627e-011 A10 = -7.10698e-014
Third side
K = 0.00000e + 000 A 4 =-5.74635e-005 A 6 = 9.59268e-008 A 8 = 2.36672e-010 A10 = -8.05912e-013 A12 = 6.16498e-016
Fourth side
K = 0.00000e + 000A 4 = -4.50428e-005 A 6 = 1.55564e-007 A 8 = -8.76130e-012 A10 =-1.15575e-013 A12 = 1.92346e-016
9th surface
K = 0.00000e + 000A 4 = -4.99220e-006 A 6 = 4.65954e-009 A 8 =-1.91748e-011
25th
K = 0.00000e + 000 A 4 = -2.71326e-005 A 6 = -7.49757e-009 A 8 =-4.82275e-010
Various data zoom ratio 2.20
Wide-angle Intermediate telephoto focal length 15.45 23.29 33.95
F number 2.92 2.92 2.92
Half angle of view 54.47 42.89 32.51
Image height 21.64 21.64 21.64
Lens total length 152.24 136.06 133.89
BF 11.00 11.00 11.00
d 8 39.15 14.97 0.78
d21 1.00 5.25 8.38
d24 12.17 7.92 4.78
d26 1.50 5.82 6.86
d28 1.56 5.25 16.22
Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1-26.42 27.05 1.29-20.94
2 9 29.72 42.24 26.07-16.65
3 22-50.43 5.67 3.70 0.73
4 25-60.56 1.40 0.58-0.17
5 27 87.88 4.94 -0.22 -3.31
6 29 114.00 4.57 3.02 0.34
Single lens data lens Start surface Focal length
1 1-26.43
2 3 -327.06
3 5 -63.03
4 7 54.25
5 9 57.61
6 12 -33.85
7 13 27.62
8 15-24.92
9 16 34.83
10 19 -64.14
11 20 21.05
12 22 24.51
13 23 -16.16
14 25-60.56
15 27 87.88
16 29 114.00

［数値実施例６］
単位 mm
面データ
面番号 r d nd vd 有効径
1* 19994.471 2.40 1.76450 49.1 45.63
2* 20.266 8.04 32.13
3 80.884 1.90 1.88300 40.8 31.95
4* 34.611 3.00 28.57
5 94.878 1.50 1.59522 67.7 28.33
6 21.816 5.50 1.85478 24.8 26.27
7 78.445 (可変) 25.09
8(絞り) ∞ 1.50 14.37
9 29.888 0.80 2.00069 25.5 15.41
10 13.906 5.81 1.79682 32.7 15.27
11 -31.465 1.94 15.46
12 -21.965 0.80 2.00100 29.1 15.02
13 16.986 4.81 1.80810 22.8 15.95
14 -1178.944 0.15 17.01
15 33.664 6.93 1.53775 74.7 18.05
16 -24.820 2.42 19.90
17 ∞ 1.00 21.37
18 22.904 0.90 2.00069 25.5 22.68
19 14.976 8.88 1.49700 81.5 21.66
20 -34.875 (可変) 21.98
21 -283.637 5.00 1.95906 17.5 21.62
22 -18.411 0.90 1.85478 24.8 21.56
23 85.683 (可変) 20.96
24 -18.235 1.10 1.85400 40.4 20.92
25* -95.271 4.05 23.55
26 49.527 7.06 1.59522 67.7 35.86
27 -111.896 (可変) 36.78
像面 ∞
非球面データ
第1面
K = 0.00000e+000 A 4= 8.28189e-005 A 6=-5.68498e-007 A 8= 2.66614e-009 A10=-7.68410e-012 A12= 1.31490e-014 A14=-1.23709e-017 A16= 4.96477e-021
第2面
K = 3.74402e-001 A 4= 6.29521e-005 A 6=-2.43558e-007 A 8=-2.44403e-009 A10= 2.92659e-011 A12=-1.03941e-013 A14= 1.08083e-016
第4面
K = 0.00000e+000 A 4= 1.50294e-005 A 6=-1.52662e-007 A 8= 2.29319e-009 A10=-1.99314e-011 A12= 8.51505e-014 A14=-1.29267e-016
第25面
K = 0.00000e+000 A 4= 3.92199e-005 A 6=-1.14262e-007 A 8= 1.64076e-009 A10=-1.05360e-011 A12= 2.34446e-014
各種データ
ズーム比 2.20
広角中間望遠
焦点距離 15.45 23.25 34.00
Ｆナンバー 4.12 4.12 4.12
半画角 54.47 42.94 32.47
像高 21.64 21.64 21.64
レンズ全長 125.79 119.96 117.30
BF 12.00 19.22 24.17
d 7 28.35 13.49 2.01
d20 1.00 1.44 5.30
d23 8.04 9.42 9.43
d27 12.00 19.22 24.17

レンズ群データ
群始面焦点距離レンズ構成長前側主点位置後側主点位置
1 1 -21.14 22.34 3.03 -13.34
2 8 23.98 35.94 18.13 -12.11
3 21 -129.54 5.90 2.04 -0.97
4 24 -60.21 12.21 -6.47 -17.09
単レンズデータ
レンズ始面焦点距離
1 1 -26.54
2 3 -69.86
3 5 -47.96
4 6 33.84
5 9 -26.66
6 10 12.83
7 12 -9.47
8 13 20.76
9 15 27.72
10 18 -45.84
11 19 22.41
12 21 20.34
13 22 -17.66
14 24 -26.58
15 26 58.64 Numerical Embodiment 6
Unit mm
Surface data surface number rd nd vd effective diameter
1 * 19994.471 2.40 1.76450 49.1 45.63
2 * 20.266 8.04 32.13
3 80.884 1.90 1.88300 40.8 31.95
4 * 34.611 3.00 28.57
5 94.878 1.50 1.59522 67.7 28.33
6 21.816 5.50 1.85478 24.8 26.27
7 78.445 (variable) 25.09
8 (aperture) ∞ 1.50 14.37
9 29.888 0.80 2.00069 25.5 15.41
10 13.906 5.81 1.79682 32.7 15.27
11-31.465 1.94 15.46
12 -21.965 0.80 2.00100 29.1 15.02
13 16.986 4.81 1.80810 22.8 15.95
14 -1178.944 0.15 17.01
15 33.664 6.93 1.53775 74.7 18.05
16-24.820 2.42 19.90
17 1.00 21.37
18 22.904 0.90 2.00069 25.5 22.68
19 14.976 8.88 1.49700 81.5 21.66
20 -34.875 (variable) 21.98
21 -283.637 5.00 1.95906 17.5 21.62
22-18.411 0.90 1.85478 24.8 21.56
23 85.683 (variable) 20.96
24 -18.235 1.10 1.85400 40.4 20.92
25 * -95.271 4.05 23.55
26 49.527 7.06 1.59522 67.7 35.86
27-111.896 (variable) 36.78
Image plane ∞
Aspheric data first surface
K = 0.00000e + 000 A 4 = 8.28189e-005 A 6 =-5.68498e-007 A 8 = 2.66614e-009 A10 =-7.68410e-012 A12 = 1.314709e-014 A14 =-1.23709e-017 A16 = 4.96477e-021
Second side
K = 3.74402e-001 A 4 = 6.29521e-005 A 6 =-2.43558e-007 A 8 =-2.44403e-009 A10 = 2.92659e-011 A12 =-1.03941e-013 A14 = 1.08083e-016
Fourth side
K = 0.00000e + 000A 4 = 1.50294e-005 A 6 = -1.52662e-007 A 8 = 2. 29319e-009 A10 = -1.99314e-011 A12 = 8.51505e-014 A14 =-1.29267e-016
25th
K = 0.00000e + 000A 4 = 3.92199e-005 A 6 =-1.14262e-007 A 8 = 1. 64076e-009 A10 =-1.05360e-011 A12 = 2.34446e-014
Various data zoom ratio 2.20
Wide-angle Intermediate telephoto focal length 15.45 23.25 34.00
F number 4.12 4.12 4.12
Half angle of view 54.47 42.94 32.47
Image height 21.64 21.64 21.64
Total lens length 125.79 119.96 117.30
BF 12.00 19.22 24.17
d 7 28.35 13.49 2.01
d20 1.00 1.44 5.30
d23 8.04 9.42 9.43
d27 12.00 19.22 24.17

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1 -21.14 22.34 3.03 -13.34
2 8 23.98 35.94 18.13-12.11.
3 21 -129.54 5.90 2.04 -0.97
4 24 -60.21 12.21-6.47-17.09
Single lens data lens Start surface Focal length
1 1-26.54
2 3 -69.86
3 5-47.96
4 6 33.84
5 9 -26.66
6 10 12.83
7 12-9.47
8 13 20.76
9 15 27.72
10 18 -45.84
11 19 22.41
12 21 20.34
13 22-17.66
14 24-26.58
15 26 58.64

［撮像装置の実施例］
次に、本発明の光学系を撮像光学系として用いた撮像装置の実施例について図１３を用いて説明する。撮像装置１００は、例えば、デジタルスチルカメラ、ビデオカメラ、監視カメラ、放送用カメラ等の撮像素子を用いた撮像装置、または銀塩写真フィルムを用いたカメラ等の撮像装置である。 [Embodiment of Imaging Device]
Next, an embodiment of an imaging apparatus using the optical system of the present invention as an imaging optical system will be described using FIG. The imaging device 100 is an imaging device such as a digital still camera, a video camera, a surveillance camera, an imaging device using an imaging device such as a broadcast camera, or a camera using a silver halide photographic film.

図１３において、カメラ本体２０は、実施例１〜６で説明したいずれかの光学系である撮影光学系２１と、カメラ本体２０に内蔵され且つ撮影光学系２１によって形成された被写体像を受光する固体撮像素子（光電変換素子）２２とを有する。固体撮像素子２２は、例えばＣＣＤセンサやＣＭＯＳセンサ等である。メモリ２３は撮像素子２２が受光した被写体像を記録する記録手段である。ファインダー２４は、撮像素子２２上に形成された被写体像であって、表示素子（不図示）に表示された被写体像を観察するためのファインダーである。 In FIG. 13, the camera body 20 receives a subject image built in the camera body 20 and formed by the imaging optical system 21 and the imaging optical system 21 which is any of the optical systems described in the first to sixth embodiments. And a solid-state imaging device (photoelectric conversion device) 22. The solid-state imaging device 22 is, for example, a CCD sensor or a CMOS sensor. The memory 23 is a recording unit that records an object image received by the image sensor 22. The finder 24 is a subject image formed on the image sensor 22 and is a finder for observing the subject image displayed on the display device (not shown).

このように本発明の光学系をデジタルスチルカメラ等の撮像装置に適用することにより、小型で、無限遠から至近距離まで高い光学性能を有する撮像装置を得ることができる。 As described above, by applying the optical system of the present invention to an imaging device such as a digital still camera, a compact imaging device having high optical performance from infinity to a close distance can be obtained.

Ｌ１第１レンズ群
Ｌ２第２レンズ群
Ｌ３第３レンズ群
Ｌ４第４レンズ群 L1 first lens group L2 second lens group L3 third lens group L4 fourth lens group

Claims

A first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, and a fourth lens group of negative refractive power, arranged in order from the object side to the image side A zoom lens in which the distance between adjacent lens units changes during zooming,
When the focal length of the third lens group is f3 and the focal length of the fourth lens group is f4,
0.80 <f3 / f4 <5.00
A zoom lens characterized by satisfying the conditional expression of

Assuming that the focal length of the second lens group is f2.
0.30 <f2 / | f4 | <3.00
The zoom lens according to claim 1, which satisfies the following conditional expression.

The focal length of the zoom lens at the wide-angle end is fw, the amount of movement of the second lens unit during zooming from the wide-angle end to the telephoto end is m2, and the sign of the amount of movement of the lens unit is the image at the telephoto end compared to the wide-angle end. When the position on the object side is positive, and the position on the object side at the telephoto end compared to the wide-angle end is negative,
0.50 <| m2 | / fw <1.40
3. The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

Assuming that the focal length of the first lens group is f1 and the focal length of the second lens group is f2,
0.50 <| f1 | / f2 <2.00
The zoom lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.

When the focal length of the zoom lens at the wide angle end is fw and the focal length of the zoom lens at the telephoto end is ft,
ft / fw> 1.80
The zoom lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied.

Assuming that the focal length of the zoom lens at the wide angle end is fw,
1.00 <| f4 | / fw <4.50
The zoom lens according to any one of claims 1 to 5, wherein the following conditional expression is satisfied.

The zoom lens according to any one of claims 1 to 6, wherein the fourth lens group includes a negative lens having a concave surface facing the object side.

The zoom lens according to claim 7, wherein the negative lens has an aspheric shape in which negative refractive power increases from the center to the periphery.

The zoom lens according to any one of claims 1 to 8, wherein the third lens group includes at least one positive lens and one negative lens.

The zoom lens according to any one of claims 1 to 9, wherein the third lens unit moves toward the image side during focusing from infinity to a close distance.

11. The zoom lens according to claim 10, wherein the fourth lens unit moves toward the image side during focusing from infinity to a close distance.

The zoom lens comprises a first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, and a fourth lens group of negative refractive power. The zoom lens according to any one of claims 1 to 11.

The zoom lens includes a first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, a fourth lens group of negative refractive power, and a positive refractive power. The zoom lens according to any one of claims 1 to 10, comprising a fifth lens group.

The zoom lens includes a first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, a fourth lens group of negative refractive power, and a positive refractive power. The zoom lens according to any one of claims 1 to 10, comprising a fifth lens group and a sixth lens group of positive refractive power.

A zoom lens according to any one of claims 1 to 14,
And an imaging device for receiving an image formed by the zoom lens.