JP4203284B2 - Telephoto zoom lens - Google Patents
Telephoto zoom lens Download PDFInfo
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- JP4203284B2 JP4203284B2 JP2002246036A JP2002246036A JP4203284B2 JP 4203284 B2 JP4203284 B2 JP 4203284B2 JP 2002246036 A JP2002246036 A JP 2002246036A JP 2002246036 A JP2002246036 A JP 2002246036A JP 4203284 B2 JP4203284 B2 JP 4203284B2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、スチルカメラ、電子スチルカメラやビデオカメラ等に用いられる望遠ズームレンズに関する。
【０００２】
【従来の技術】
従来より、望遠ズームレンズとしては、特開平６−５１２０２号公報、特開平８−２３４１０５号公報が知られ、インナーフォーカス方式の望遠ズームレンズとしては、特開平７−１４０３８６号公報が知られているが、これらはいずれも、望遠側の焦点距離が２００ｍｍ程度となっており、さらなる望遠化は困難であった。また、特開平５−２２４１２３号公報、特開平７−３５９８０号公報、特開平７−６３９９３号公報では、変倍時に１群が移動するため、重量バランスが悪くなり、操作性が悪いものであった。特開平５−３０３０３５号公報は、変倍比が大きくない。一方、特公平４−１３２８号公報は、フォーカスレンズ重量を低減することが考慮されてはいるが、さらなる望遠化を進めると、フォーカスレンズ重量が増加し、迅速なフォーカシングが困難となる問題があった。
【０００３】
【発明が解決しようとする課題】
本発明は、迅速なフォーカシングが可能であり、光学性能が良好な望遠ズームレンズを提供することを目的とする。
【０００４】
【課題を解決するための手段】
本発明は、物体側より順に正の屈折力を有する第１レンズ群、負の屈折力を有する第２レンズ群、正の屈折力を有する第３レンズ群、正の屈折力を有する第４レンズ群から成り、広角端から望遠端への変倍に際して、第１レンズ群と第４レンズ群は光軸に対して固定であり第２レンズ群は光軸上を像面に向かって移動し、第１レンズ群は物体側から順に正の屈折力を有する第１Ａレンズ群、負の屈折力を有する第１Ｂレンズ群、１枚の正レンズで構成されるか、もしくは、負メニスカスレンズを少なくとも１枚含み、正の屈折力を有する第１Ｃレンズ群の３つの群から構成され、第１Ｃレンズ群を光軸方向に移動させてフォーカシングを行う望遠ズームレンズで、条件式（１）を満足することで、上記課題を解決した。
【０００５】
（１）１．９＜ｈＴ１Ａ／ｈＴ１Ｃ＜２．３
但し、ｈＴ１Ａ：無限遠物体での望遠端時のＦナンバー光線の第１Ａレンズ群への入射高さ
ｈＴ１Ｃ：無限遠物体での望遠端時のＦナンバー光線の第１Ｃレンズ群への射出高さ
【０００６】
第１Ｃレンズ群は、フォーカシングを行うため、軽量であることが望ましく、第１Ｃレンズ群を、１枚の正レンズで構成するか、負メニスカスレンズ１枚と正レンズ１枚で構成することで、迅速なフォーカシングが可能となる。さらに、第１Ｃレンズ群の構成を、物体側より順に、物体側に凸面を向けた負メニスカスレンズ、正レンズとすることで、第１Ｃレンズ群内部の製造誤差による光学性能への敏感度を小さくすることができる。条件式について、条件式（１）は、第２レンズ群、第３レンズ群を小型化するための条件である。条件式（１）の上限値を越えると、第２レンズ群、第３レンズ群を小型化することができるが、第１レンズ群への負担が大きくなり、光学性能を良好に保とうとすると、第１レンズ群が大型化し、結果としてレンズ系全体の大型化を招く。一方、下限値を越えると、第２レンズ群、第３レンズ群が大型化し、機構設計での困難度が増す。
【０００７】
また、請求項１記載の望遠ズームレンズにおいて、以下の条件を満足することが望ましい。
（２）１．５＜|βＴ２|＜２．２
（３）０．４＜|β１Ｃ|＜０．７
但し、βＴ２：無限遠物体での望遠端時の第２レンズ群の横倍率
β１Ｃ：無限遠物体での第１Ｃレンズ群の横倍率
【０００８】
条件式（２）は、望遠端時の第２レンズ群の横倍率を規定するものである。条件式（２）の上限値を越えると、第２レンズ群の倍率負担が大きくなりすぎて、変倍時の球面収差の変動がおおきくなり、光学性能の劣化を招く。一方、下限値を越えると、第２レンズ群の倍率負担が小さくなり、変倍時の第２レンズ群の移動量が大きくなりすぎる。条件式（３）は、第１Ｃレンズ群の横倍率を規定するものである。条件式（３）の上限値を越えると、フォーカシングによる第１Ｃレンズ群の移動量は小さくなるが、フォーカシング時の倍率色収差変動が大きくなり、光学性能の劣化を招く。一方、下限値を越えると第１Ｃレンズ群の倍率負担が小さくなり、フォーカシングによる第１Ｃレンズ群の移動量が大きくなり、迅速なフォーカシングが困難となる。
【０００９】
さらには、請求項１記載の望遠ズームレンズにおいて、以下の条件を満足することが望ましい。
【００１０】
（４）６４．０＜ν１Ｃ
但し、ν１Ｃ：第１Ｃレンズ群中の正レンズのアッベ数
【００１１】
条件式（４）は、第１Ｃレンズ群内の正レンズのアッベ数を規定するものである。条件式（４）の下限値を越えると第１Ｃレンズ群内の正レンズのアッベ数が小さくなり、軸上色収差および倍率色収差の補正が困難となり、また、フォーカシングによる軸上色収差および倍率色収差の変動を、小さくすることができなくなる。
【００１２】
【実施例】
以下に、本発明のズームレンズの数値実施例１、数値実施例２及び数値実施例３を示す。
【００１３】
ここで［全体諸元］中、fは焦点距離、Bfはバックフォーカス、FnoはＦナンバー、２ωは画角を示す。［レンズ諸元］中、番号は物体側から順にレンズの面番号、ｒはレンズ面の曲率半径、ｄはレンズ面間隔、ｎはｄ線の屈折率、νはアッベ数を示す。
【００１４】
【発明の効果】
以上の数値実施例１乃至数値実施例３が示すように、本発明は、迅速なフォーカシングが可能であり、光学性能が良好な望遠ズームレンズを提供できる。
【図面の簡単な説明】
【図１】数値実施例１のレンズ断面図である。
【図２】数値実施例１の無限遠撮影時の広角端の諸収差である。
【図３】数値実施例１の無限遠撮影時の中間焦点距離の諸収差図である。
【図４】数値実施例１の無限遠撮影時の望遠端の諸収差図である。
【図５】数値実施例１の撮影距離7000ｍｍ時の広角端の諸収差図である。
【図６】数値実施例１の撮影距離7000ｍｍ時の中間焦点距離の諸収差図である。
【図７】数値実施例１の撮影距離7000ｍｍ時の望遠端の諸収差図である。
【図８】数値実施例２のレンズ断面図である。
【図９】数値実施例２の無限遠撮影時の広角端の諸収差である。
【図１０】数値実施例２の無限遠撮影時の中間焦点距離の諸収差図である。
【図１１】数値実施例２の無限遠撮影時の望遠端の諸収差図である。
【図１２】数値実施例２の撮影距離7000ｍｍ時の広角端の諸収差図である。
【図１３】数値実施例２の撮影距離7000ｍｍ時の中間焦点距離の諸収差図である。
【図１４】数値実施例２の撮影距離7000ｍｍ時の望遠端の諸収差図である。
【図１５】数値実施例３のレンズ断面図である。
【図１６】数値実施例３の無限遠撮影時の広角端の諸収差である。
【図１７】数値実施例３の無限遠撮影時の中間焦点距離の諸収差図である。
【図１８】数値実施例３の無限遠撮影時の望遠端の諸収差図である。
【図１９】数値実施例３の撮影距離7000ｍｍ時の広角端の諸収差図である。
【図２０】数値実施例３の撮影距離7000ｍｍ時の中間焦点距離の諸収差図である。
【図２１】数値実施例３の撮影距離7000ｍｍ時の望遠端の諸収差図である。
【符号の説明】
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
Ｇ１Ａ 第１Ａレンズ群
Ｇ１Ｂ 第１Ｂレンズ群
Ｇ１Ｃ 第１Ｃレンズ群[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telephoto zoom lens used for a still camera, an electronic still camera, a video camera, and the like.
[0002]
[Prior art]
Conventionally, as a telephoto zoom lens, JP-A-6-51202 and JP-A-8-234105 are known, and as an inner focus type telephoto zoom lens, JP-A-7-140386 is known. However, both of them have a focal length on the telephoto side of about 200 mm, and it is difficult to further telephoto. In JP-A-5-224123, JP-A-7-35980, and JP-A-7-63993, one group moves during zooming, resulting in poor weight balance and poor operability. It was. Japanese Patent Laid-Open No. 5-303035 does not have a large zoom ratio. On the other hand, although Japanese Patent Publication No.4-1328 considers reducing the weight of the focus lens, there is a problem that if the telephoto lens is further telescoped, the weight of the focus lens increases and it becomes difficult to perform rapid focusing. It was.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a telephoto zoom lens capable of rapid focusing and having good optical performance.
[0004]
[Means for Solving the Problems]
The present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power. The first lens group and the fourth lens group are fixed with respect to the optical axis, and the second lens group moves on the optical axis toward the image plane when zooming from the wide-angle end to the telephoto end. The first lens group includes, in order from the object side, a first A lens group having a positive refractive power, a first B lens group having a negative refractive power, one positive lens, or at least one negative meniscus lens. A telephoto zoom lens that includes three lenses and includes a first C lens group having a positive refractive power and performs focusing by moving the first C lens group in the optical axis direction, and satisfies the conditional expression (1) The above problem has been solved.
[0005]
(1) 1.9 <hT1A / hT1C <2.3
However, hT1A: the incident height of the F-number light beam at the telephoto end at the infinite object to the 1A lens group hT1C: the exit height of the F-number light beam at the telephoto end at the infinite object to the 1C lens group [0006]
The first C lens group is preferably lightweight for focusing, and the first C lens group is composed of one positive lens or one negative meniscus lens and one positive lens. Rapid focusing is possible. Further, the configuration of the first C lens group is, in order from the object side, a negative meniscus lens having a convex surface facing the object side, and a positive lens, thereby reducing the sensitivity to optical performance due to manufacturing errors inside the first C lens group. can do. Regarding the conditional expression, the conditional expression (1) is a condition for reducing the size of the second lens group and the third lens group. If the upper limit value of conditional expression (1) is exceeded, the second lens group and the third lens group can be reduced in size. The first lens group becomes large, and as a result, the entire lens system becomes large. On the other hand, if the lower limit is exceeded, the second lens group and the third lens group become larger, and the degree of difficulty in mechanism design increases.
[0007]
In the telephoto zoom lens according to
(2) 1.5 <| βT2 | <2.2
(3) 0.4 <| β1C | <0.7
Where βT2: lateral magnification of the second lens group at the telephoto end with an infinite object β1C: lateral magnification of the first C lens group with an infinite object
Conditional expression (2) defines the lateral magnification of the second lens group at the telephoto end. If the upper limit of conditional expression (2) is exceeded, the magnification burden on the second lens group becomes too great, and the variation of spherical aberration during zooming increases, resulting in deterioration of optical performance. On the other hand, if the lower limit is exceeded, the magnification burden on the second lens group becomes small, and the amount of movement of the second lens group at the time of zooming becomes too large. Conditional expression (3) defines the lateral magnification of the first C lens group. If the upper limit value of conditional expression (3) is exceeded, the amount of movement of the first C lens group due to focusing will be small, but the chromatic aberration of magnification during focusing will become large, resulting in deterioration of optical performance. On the other hand, if the lower limit value is exceeded, the magnification burden on the first C lens group is reduced, the amount of movement of the first C lens group due to focusing is increased, and rapid focusing becomes difficult.
[0009]
Furthermore, in the telephoto zoom lens according to
[0010]
(4) 64.0 <ν1C
Where ν1C is the Abbe number of the positive lens in the first C lens group.
Conditional expression (4) defines the Abbe number of the positive lens in the first C lens group. When the lower limit of conditional expression (4) is exceeded, the Abbe number of the positive lens in the 1C lens group becomes small, making it difficult to correct axial chromatic aberration and lateral chromatic aberration, and fluctuations in axial chromatic aberration and lateral chromatic aberration due to focusing. Cannot be made smaller.
[0012]
【Example】
In the following, Numerical Example 1, Numerical Example 2, and Numerical Example 3 of the zoom lens of the present invention are shown.
[0013]
Here, in [Overall specifications], f is a focal length, Bf is a back focus, Fno is an F number, and 2ω is an angle of view. In [lens specifications], the number indicates the lens surface number in order from the object side, r indicates the radius of curvature of the lens surface, d indicates the distance between the lens surfaces, n indicates the refractive index of the d-line, and ν indicates the Abbe number.
[0014]
【The invention's effect】
As shown in Numerical Example 1 to Numerical Example 3 described above, the present invention can provide a telephoto zoom lens capable of rapid focusing and having good optical performance.
[Brief description of the drawings]
1 is a lens cross-sectional view of Numerical Example 1. FIG.
FIG. 2 shows various aberrations at the wide-angle end when shooting at infinity according to Numerical Example 1.
FIG. 3 is a diagram illustrating various aberrations of an intermediate focal length at the time of shooting at infinity according to Numerical Example 1.
4 is a diagram illustrating various aberrations at the telephoto end during infinite distance photographing in Numerical Example 1. FIG.
5 is a diagram illustrating various aberrations at the wide-angle end when the shooting distance is 7000 mm in Numerical Example 1. FIG.
6 is a diagram illustrating various aberrations of the intermediate focal length when the photographing distance is 7000 mm according to Numerical Example 1. FIG.
7 is a diagram of various types of aberration at the telephoto end when the shooting distance is 7000 mm according to Numerical Example 1. FIG.
8 is a lens cross-sectional view of Numerical Example 2. FIG.
FIG. 9 shows various aberrations at the wide-angle end when shooting at infinity according to Numerical Example 2.
10 is a diagram illustrating various aberrations at an intermediate focal length when shooting at infinity according to Numerical Example 2. FIG.
11 is a diagram illustrating various aberrations at the telephoto end during infinite distance photographing in Numerical Example 2. FIG.
12 is a diagram illustrating various aberrations at the wide-angle end when the shooting distance is 7000 mm according to Numerical Example 2. FIG.
FIG. 13 is a diagram illustrating all aberrations at the intermediate focal length when the photographing distance is 7000 mm in Numerical Example 2.
14 is a diagram illustrating all aberrations at the telephoto end when the photographing distance is 7000 mm in Numerical Example 2. FIG.
15 is a lens cross-sectional view of Numerical Example 3. FIG.
FIG. 16 shows various aberrations at the wide-angle end when shooting at infinity according to Numerical Example 3.
FIG. 17 is a diagram illustrating various aberrations at an intermediate focal length when shooting at infinity according to Numerical Example 3.
18 is a diagram illustrating various aberrations at the telephoto end during infinite distance photographing in Numerical Example 3. FIG.
FIG. 19 is a diagram illustrating all aberrations at the wide-angle end when the photographing distance is 7000 mm in Numerical Example 3.
FIG. 20 is a diagram illustrating all aberrations at the intermediate focal length at the photographing distance of 7000 mm in Numerical Example 3.
FIG. 21 is a diagram illustrating all aberrations at the telephoto end when the photographing distance is 7000 mm in Numerical Example 3.
[Explanation of symbols]
G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G1A 1A lens group G1B 1B lens group G1C 1C lens group
Claims (3)
（１） １．９＜ｈＴ１Ａ／ｈＴ１Ｃ＜２．３
但し、ｈＴ１Ａ：無限遠物体での望遠端時のＦナンバー光線の第１Ａレンズ群への入射高さ
ｈＴ１Ｃ：無限遠物体での望遠端時のＦナンバー光線の第１Ｃレンズ群への射出高さA first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power in order from the object side. When zooming from the wide-angle end to the telephoto end, the first lens group and the fourth lens group are fixed with respect to the optical axis, and the second lens group moves on the optical axis toward the image plane. Is composed of a first A lens group having positive refractive power, a first B lens group having negative refractive power, and one positive lens in order from the object side, or includes at least one negative meniscus lens, A telephoto zoom lens comprising three groups of a first C lens group having a refractive power of 1, a first C lens group being moved in the optical axis direction for focusing, and satisfying the following conditions:
(1) 1.9 <hT1A / hT1C <2.3
However, hT1A: the incident height of the F-number light beam at the telephoto end at the infinite object to the 1A lens group hT1C: the exit height of the F-number light beam at the telephoto end at the infinite object to the 1C lens group
（２）１．５＜|βＴ２|＜２．２
（３）０．４＜|β１Ｃ|＜０．７
但し、βＴ２：無限遠物体での望遠端時の第２レンズ群の横倍率
β１Ｃ：無限遠物体での第１Ｃレンズ群の横倍率2. The telephoto zoom lens according to claim 1, wherein in the telephoto zoom lens, the first lens group and the second lens group satisfy the following conditions.
(2) 1.5 <| βT2 | <2.2
(3) 0.4 <| β1C | <0.7
However, βT2: lateral magnification of the second lens group at the telephoto end with an infinite object β1C: lateral magnification of the first C lens group with an infinite object
（４）６４．０＜ν１Ｃ
但し、ν１Ｃ：第１Ｃレンズ群中の正レンズのアッベ数2. The telephoto zoom lens according to claim 1, wherein the first lens group satisfies the following conditions.
(4) 64.0 <ν1C
Where ν1C: Abbe number of the positive lens in the first C lens group
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002246036A JP4203284B2 (en) | 2002-08-27 | 2002-08-27 | Telephoto zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002246036A JP4203284B2 (en) | 2002-08-27 | 2002-08-27 | Telephoto zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004085846A JP2004085846A (en) | 2004-03-18 |
| JP4203284B2 true JP4203284B2 (en) | 2008-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2002246036A Expired - Fee Related JP4203284B2 (en) | 2002-08-27 | 2002-08-27 | Telephoto zoom lens |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5544959B2 (en) * | 2010-03-18 | 2014-07-09 | 株式会社ニコン | Variable-magnification optical system, optical apparatus, and variable-magnification optical system manufacturing method |
| JP5693321B2 (en) | 2011-03-28 | 2015-04-01 | キヤノン株式会社 | Zoom lens and imaging device |
| JP5693322B2 (en) | 2011-03-28 | 2015-04-01 | キヤノン株式会社 | Zoom lens and imaging device |
| JP5617884B2 (en) | 2012-09-11 | 2014-11-05 | リコーイメージング株式会社 | Zoom lens system and electronic imaging apparatus including the same |
| JP6608125B2 (en) | 2014-05-01 | 2019-11-20 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP5984877B2 (en) * | 2014-06-13 | 2016-09-06 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| US9739986B2 (en) | 2014-06-13 | 2017-08-22 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
| JP6405150B2 (en) | 2014-08-21 | 2018-10-17 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP6646244B2 (en) * | 2015-03-18 | 2020-02-14 | キヤノン株式会社 | Zoom lens and imaging device |
| JP6544975B2 (en) * | 2015-04-10 | 2019-07-17 | キヤノン株式会社 | Zoom lens and imaging device |
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2002
- 2002-08-27 JP JP2002246036A patent/JP4203284B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2004085846A (en) | 2004-03-18 |
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