JP2009282554A - Zoom lens - Google Patents
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- JP2009282554A JP2009282554A JP2009203574A JP2009203574A JP2009282554A JP 2009282554 A JP2009282554 A JP 2009282554A JP 2009203574 A JP2009203574 A JP 2009203574A JP 2009203574 A JP2009203574 A JP 2009203574A JP 2009282554 A JP2009282554 A JP 2009282554A
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本発明はフィルム用の写真カメラや電子記録方式のビデオカメラ、デジタルカメラ、そしてＳＶカメラ等に好適なズームレンズに関する。特に負の屈折力のレンズ群が先行する全体として４つのレンズ群を有し、これら４つのレンズ群のレンズ構成を適切に設定することにより、レンズ系全体の小型化を図ったネガティブリード型のズームレンズに関するものである。 The present invention relates to a zoom lens suitable for a photographic camera for a film, a video camera of an electronic recording system, a digital camera, and an SV camera. In particular, the negative lead type lens unit has a total of four lens units preceded by a lens unit having a negative refractive power, and by appropriately setting the lens configuration of these four lens units, the entire lens system can be reduced in size. The present invention relates to a zoom lens.
従来より負の屈折力のレンズ群が先行する所謂ネガティブリード型のズームレンズは近接撮影距離が比較的短くなり、又広画角化が比較的容易であるため、広角用のズームレンズには多く用いられている。一方でネガティブリード型のズームレンズは、望遠端では第１レンズ群と第２レンズ群が全体として正のグループ、第３レンズ群と第４レンズ群が全体として負のグループを構成している。そして光学系全体として所謂テレフォトタイプとできることから、望遠端も長焦点化しやすいといったメリットを有している。例えば物体側より順に負の屈折力の第１群、正の屈折力の第２群、負の屈折力の第３群、そして正の屈折力の第４群の４つのレンズ群より構成している。そして変倍の際には、これらのレンズ群のうちの少なくとも２つのレンズ群を移動させて変倍を行ったズームレンズが知られている（特許文献１〜３）。 A so-called negative lead type zoom lens preceded by a lens unit having a negative refractive power than before has a relatively short close-up shooting distance and a relatively wide angle of view. It is used. On the other hand, in the negative lead type zoom lens, the first lens group and the second lens group as a whole constitute a positive group, and the third lens group and the fourth lens group as a whole constitute a negative group at the telephoto end. Since the entire optical system can be of a so-called telephoto type, the telephoto end has an advantage that it is easy to make the focal length longer. For example, in order from the object side, the first lens unit has a negative refractive power, a second lens unit has a positive refractive power, a third lens unit has a negative refractive power, and a fourth lens unit has a positive refractive power. Yes. In zooming, zoom lenses that perform zooming by moving at least two of these lens groups are known (Patent Documents 1 to 3).
近年一眼レフカメラやビデオカメラ等に用いる標準用のズームレンズとしては、所定の変倍比を有し、広画角を含み、かつレンズ系全体が小型のものが要望されている。上記ネガティブリード型のズームタイプは、簡易な標準ズームレンズに用いられる負と正の屈折力の２つのレンズ群より成る２群ズーム、所謂ショートズーム等と比較すると、レンズ群を４つ有していることから、レンズ枚数が多くなってしまう傾向があった。一般にズームレンズにおいて各レンズ群を屈折力を強めれば所定の変倍比を得るための各レンズ群の移動量が少なくなる為、レンズ全長の短縮化を図りつつ、広画角化が可能となる。しかしながら単に各レンズ群の屈折力を強めると、変倍に伴う収差変動が大きくなり、特に広画角化を図る際には全変倍範囲にわたり良好なる光学性能を得るのが難しくなってくるという問題点がある。 In recent years, as a standard zoom lens used for a single-lens reflex camera, a video camera, or the like, a zoom lens having a predetermined zoom ratio, a wide angle of view, and a small lens system is desired. The negative lead type zoom type has four lens groups as compared with a two-group zoom composed of two lens groups of negative and positive refractive power used in a simple standard zoom lens, so-called short zoom or the like. Therefore, the number of lenses tends to increase. In general, increasing the refracting power of each lens group in a zoom lens reduces the amount of movement of each lens group for obtaining a predetermined zoom ratio, thus enabling a wide angle of view while shortening the overall lens length. Become. However, simply increasing the refracting power of each lens group increases aberration fluctuations accompanying zooming, and it is difficult to obtain good optical performance over the entire zooming range, especially when widening the angle of view. There is a problem.
本発明はズームレンズを全体として４つのレンズ群より構成し、各レンズ群の屈折力やレンズ構成そして変倍に伴う各レンズ群の移動条件等を適切に設定する。これにより広画角で、しかも全変倍範囲にわたり高い光学性能を有したレンズ系全体の小型化を図ったズームレンズの提供を目的とする。 In the present invention, the zoom lens is composed of four lens groups as a whole, and the refractive power of each lens group, the lens configuration, the moving condition of each lens group accompanying zooming, and the like are set appropriately. Accordingly, an object of the present invention is to provide a zoom lens that has a wide angle of view and that has a high optical performance over the entire zoom range, and that is downsized.
請求項１の発明のズームレンズは、物体側より順に、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、正の屈折力の第４レンズ群より構成され、広角端から望遠端への変倍に際し、前記第１レンズ群は像側へ凸状の軌跡で移動し、前記第２レンズ群は前記第１レンズ群との間隔が縮小するように物体側へ移動し、前記第３レンズ群は前記第２レンズ群との間隔が増大するように物体側へ移動し、前記第４レンズ群は前記第３レンズ群との間隔が縮小するように物体側へ移動し、前記第１レンズ群は、物体側から順に、物体側に凸面を向けたメニスカス状の負レンズ、負レンズ、正レンズより構成され、前記第２レンズ群は２枚の正レンズと１枚の負レンズで構成され、絞りは前記第３レンズ群の物体側に配置され、且つ前記第３レンズ群と一体に移動し、第ｉレンズ群の焦点距離をｆｉ、広角端における光学系全体の焦点距離をｆｗとしたとき
１．１＜｜ｆ１／ｆｗ｜＜１．４ ‥‥‥（１）
０．８＜ ｆ２／ｆｗ ＜１．０ ‥‥‥（２）
の条件を満足することを特徴としている。
The zoom lens according to the first aspect of the present invention includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive lens having a positive refractive power. The fourth lens group includes a fourth lens group, and the first lens group moves along a locus convex toward the image side upon zooming from the wide-angle end to the telephoto end, and the second lens group is spaced from the first lens group. The third lens group moves toward the object side so that the distance from the second lens group is increased, and the fourth lens group is spaced from the third lens group. The first lens group is composed of, in order from the object side, a meniscus negative lens having a convex surface facing the object side, a negative lens, and a positive lens, and the second lens group Is composed of two positive lenses and one negative lens, and the stop is located on the object side of the third lens group. 1.1 <| f1 / fw | <1 where the focal length of the i-th lens group is fi, and the focal length of the entire optical system at the wide-angle end is fw. 4 (1)
0.8 <f2 / fw <1.0 (2)
It is characterized by satisfying the following conditions.
請求項２の発明は請求項１の発明において、前記第２レンズ群と第４レンズ群は変倍に際して一体に移動することを特徴としている。 According to a second aspect of the present invention, in the first aspect of the invention, the second lens group and the fourth lens group move together during zooming.
請求項３の発明は請求項１又は２の発明において、前記第３レンズ群は正レンズ、負レンズ、各１枚で構成され、
１．５＜｜ｆ３／ｆｗ｜＜３．０ ‥‥‥（３）
の条件を満足することを特徴としている。
The invention of claim 3 is the invention of claim 1 or 2, wherein the third lens group is composed of a positive lens, a negative lens, and one each.
1.5 <| f3 / fw | <3.0 (3)
It is characterized by satisfying the following conditions.
請求項４の発明は請求項１乃至３のいずれか１項の発明において、前記第４レンズ群は正レンズ、負レンズ各１枚で構成され、
２．５＜ｆ４／ｆｗ＜８．０ ‥‥‥（４）
の条件を満足することを特徴としている。
The invention of claim 4 is the invention of any one of claims 1 to 3, wherein the fourth lens group is composed of one positive lens and one negative lens,
2.5 <f4 / fw <8.0 (4)
It is characterized by satisfying the following conditions.
請求項５の発明は請求項１乃至４のいずれか１項の発明において、前記第２レンズ群は負レンズと正レンズの接合レンズを有し、第ｉレンズ群の接合レンズの正レンズの材質のアッベ数をνｉｐ、第ｉレンズ群の接合レンズの負レンズの材質のアッベ数をνｉｎとしたとき
２０＜ν２ｐ−ν２ｎ ‥‥‥（５）
の条件を満足することを特徴としている。
According to a fifth aspect of the present invention, in the first aspect of the present invention, the second lens group has a cemented lens of a negative lens and a positive lens, and the material of the positive lens of the cemented lens of the i-th lens group. 20 <ν2p−ν2n (5) where νip is the Abbe number and νin is the negative lens material of the cemented lens in the i-th lens group.
It is characterized by satisfying the following conditions.
請求項６の発明は請求項１乃至５のいずれか１項の発明において、前記第３レンズ群は負レンズと正レンズの接合レンズより構成され、第ｉレンズ群の接合レンズの正レンズの材質の屈折率をＮｉｐ、第ｉレンズ群の接合レンズの負レンズの材質の屈折率をＮｉｎ、第ｉレンズ群の接合レンズの正レンズの材質のアッベ数をνｉｐ、第ｉレンズ群の接合レンズの負レンズの材質のアッベ数をνｉｎとしたとき
４．０ ＜ν３ｎ−ν３ｐ＜１２．０ ‥‥‥（６）
０．０５＜Ｎ３ｐ−Ｎ３ｎ＜０．２０ ‥‥‥（７）
の条件を満足することを特徴としている。
The invention of claim 6 is the invention of any one of claims 1 to 5, wherein the third lens group comprises a cemented lens of a negative lens and a positive lens, and the material of the positive lens of the cemented lens of the i-th lens group. Is the refractive index of the negative lens material of the i-th lens group, Nin, the Abbe number of the positive lens material of the cemented lens of the i-th lens group is νip, and the cemented lens of the i-th lens group When the Abbe number of the material of the negative lens is νin, 4.0 <ν3n−ν3p <12.0 (6)
0.05 <N3p-N3n <0.20 (7)
It is characterized by satisfying the following conditions.
請求項７の発明は請求項１乃至６のいずれか１項の発明において、前記第４レンズ群は少なくとも１つの非球面を有していることを特徴としている。 A seventh aspect of the invention is characterized in that, in the invention of any one of the first to sixth aspects, the fourth lens group has at least one aspherical surface.
請求項８の発明は請求項１乃至７のいずれか１項の発明において、前記第４レンズ群はプラスチック非球面レンズを有していることを特徴としている。 The invention of claim 8 is the invention of any one of claims 1 to 7, wherein the fourth lens group has a plastic aspheric lens.
請求項９の発明のカメラは請求項１乃至８のいずれか１項に記載のズームレンズを有していることを特徴としている。 According to a ninth aspect of the present invention, there is provided a camera having the zoom lens according to any one of the first to eighth aspects.
本発明によれば以上のように、ズームレンズを全体として４つのレンズ群より構成している。そして各レンズ群の屈折力やレンズ構成そして変倍に伴う各レンズ群の移動条件等を適切に設定することにより、広画角で、しかも全変倍範囲にわたり高い光学性能を有したレンズ系全体の小型化を図ったズームレンズを達成することができる。 As described above, according to the present invention, the zoom lens is composed of four lens groups as a whole. The entire lens system has a wide field angle and high optical performance over the entire zoom range by appropriately setting the refractive power of each lens group, the lens configuration, and the movement conditions of each lens group when zooming. It is possible to achieve a zoom lens with a reduced size.
図１は数値実施例１のズームレンズの広角端のレンズ断面図、図２は数値実施例１のズームレンズの広角端の収差図、図３は数値実施例１のズームレンズの中間の収差図、図４は数値実施例１のズームレンズの望遠端の収差図である。図５は数値実施例２のズームレンズの広角端のレンズ断面図、図６は数値実施例２のズームレンズの広角端の収差図、図７は数値実施例２のズームレンズの中間の収差図、図８は数値実施例２のズームレンズの望遠端の収差図である。図９は数値実施例３のズームレンズの広角端のレンズ断面図、図１０は数値実施例３のズームレンズの広角端の収差図、図１１は数値実施例３のズームレンズの中間の収差図、図１２は数値実施例３のズームレンズの望遠端の収差図である。図１３は数値実施例４のズームレンズの広角端のレンズ断面図、図１４は数値実施例４のズームレンズの広角端の収差図、図１５は数値実施例４のズームレンズの中間の収差図、図１６は数値実施例４のズームレンズの望遠端の収差図である。 1 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 1, FIG. 2 is an aberration diagram at the wide-angle end of the zoom lens according to Numerical Example 1, and FIG. 3 is an aberration diagram at the middle of the zoom lens according to Numerical Example 1. FIG. 4 is an aberration diagram at the telephoto end of the zoom lens according to Numerical example 1. 5 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 2, FIG. 6 is an aberration diagram at the wide-angle end of the zoom lens according to Numerical Example 2, and FIG. 7 is an intermediate aberration diagram of the zoom lens according to Numerical Example 2. FIG. 8 is an aberration diagram at the telephoto end of the zoom lens according to Numerical example 2. 9 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 3, FIG. 10 is an aberration diagram at the wide-angle end of the zoom lens according to Numerical Example 3, and FIG. 11 is an aberration diagram at the middle of the zoom lens according to Numerical Example 3. FIG. 12 is an aberration diagram at the telephoto end of the zoom lens according to Numerical example 3. 13 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 4, FIG. 14 is an aberration diagram at the wide-angle end of the zoom lens according to Numerical Example 4, and FIG. 15 is an aberration diagram at the middle of the zoom lens according to Numerical Example 4. FIG. 16 is an aberration diagram at the telephoto end of the zoom lens according to Numerical example 4.
図１７は数値実施例５のズームレンズの広角端のレンズ断面図、図１８は数値実施例５のズームレンズの広角端の収差図、図１９は数値実施例５のズームレンズの中間の収差図、図２０は数値実施例５のズームレンズの望遠端の収差図である。図２１は数値実施例６のズームレンズの広角端のレンズ断面図、図２２は数値実施例６のズームレンズの広角端の収差図、図２３は数値実施例６のズームレンズの中間の収差図、図２４は数値実施例６のズームレンズの望遠端の収差図である。図２５は数値実施例７のズームレンズの広角端のレンズ断面図、図２６は数値実施例７のズームレンズの広角端の収差図、図２７は数値実施例７のズームレンズの中間の収差図、図２８は数値実施例７のズームレンズの望遠端の収差図である。 17 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 5. FIG. 18 is an aberration diagram at the wide-angle end of the zoom lens according to Numerical Example 5. FIG. 19 is an aberration diagram at the middle of the zoom lens according to Numerical Example 5. FIG. 20 is an aberration diagram at the telephoto end of the zoom lens in Numerical Example 5. 21 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 6, FIG. 22 is an aberration diagram at the wide-angle end of the zoom lens according to Numerical Example 6, and FIG. 23 is an aberration diagram at the middle of the zoom lens according to Numerical Example 6. FIG. 24 is an aberration diagram at the telephoto end of the zoom lens in Numerical Example 6. 25 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 7, FIG. 26 is an aberration diagram at the wide-angle end of the zoom lens according to Numerical Example 7, and FIG. 27 is an aberration diagram at the middle of the zoom lens according to Numerical Example 7. FIG. 28 is an aberration diagram at the telephoto end of the zoom lens according to Numerical example 7.
各レンズ断面図において、Ｌ１は負の屈折力の第１群、Ｌ２は正の屈折力の第２群、Ｌ３は負の屈折力の第３群、Ｌ４は正の屈折力の第４群である。ＳＰは開口絞り、ＦＣはフレアーカット絞り、ＩＰは像面である。矢印は広角端から望遠端への変倍を行う際の各レンズ群の移動軌跡を示している。尚、広角端と望遠端では変倍用レンズ群が機構上光軸上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。 In each lens sectional view, L1 is a first group having a negative refractive power, L2 is a second group having a positive refractive power, L3 is a third group having a negative refractive power, and L4 is a fourth group having a positive refractive power. is there. SP is an aperture stop, FC is a flare cut stop, and IP is an image plane. The arrows indicate the movement trajectory of each lens group when zooming from the wide-angle end to the telephoto end. Note that the zoom position when the zoom lens group is positioned at both ends of the range that can be moved on the optical axis due to the mechanism at the wide-angle end and the telephoto end.
本実施形態では広角端から望遠端への変倍に際しては、第１群Ｌ１を像面側に凸状の軌跡を有しつつ、略往復移動させて変倍に伴う像面変動を補正し、第２，第３，第４群をいずれも物体側へ移動させて変倍を行っている。このとき第２群Ｌ２を第２群と第１群との間隔が小さくなるように（縮小するように）移動させ、第３群Ｌ３を、第３群と第２群との間隔が大きくなるように（増大するように）移動させ、第４群Ｌ４を第４群と第３群との間隔が小さくなるように移動させている。また、フォーカスは第１群を移動させて行っている。このようにレンズ系を４つのレンズ群で構成し、各レンズ群の間隔を変倍時に変化させることで広角を含み、高変倍でコンパクトなズームレンズ及びそれを有するカメラを達成している。本発明は以上の構成を基本構成としている。又、変倍に際して第３群の物体側に配置された絞りＳＰは第３群と一体になって移動する。又、フレアーカット絞りＦＣは第４群と像面との間に配置され、広角側，中間画角の不要な光線をカットし、画質を向上させている。 In this embodiment, at the time of zooming from the wide-angle end to the telephoto end, the first lens unit L1 has a convex locus on the image plane side, and is moved substantially reciprocally to correct image plane variation accompanying zooming, The second, third, and fourth groups are moved to the object side for zooming. At this time, the second group L2 is moved so that the distance between the second group and the first group becomes smaller (shrinks), and the third group L3 becomes larger the distance between the third group and the second group. The fourth group L4 is moved so that the distance between the fourth group and the third group becomes small. Focusing is performed by moving the first group. In this way, the lens system is composed of four lens groups, and by changing the interval between the respective lens groups at the time of zooming, a zoom lens having a wide zooming angle and a high zoom ratio and a camera having the same are achieved. The present invention is based on the above configuration. Further, the aperture stop SP disposed on the object side of the third group moves together with the third group during zooming. The flare cut stop FC is disposed between the fourth group and the image plane, and cuts unnecessary rays on the wide angle side and the intermediate angle of view to improve the image quality.
次に本発明の特徴について説明する。本発明のズームレンズは以上の構成の基で前記第１レンズ群は、物体側から順に物体側に凸面を向けたメニスカス状の負レンズ、負レンズ、正レンズを有している。そして前記第２レンズ群は２枚の正レンズと１枚の負レンズで構成されている。そして絞りは前記第３レンズ群の近傍に配置され、かつ前記第３レンズ群と一体に移動し、且つ条件式（１），（２）を満足している。即ち、第ｉレンズ群の焦点距離をｆｉ、広角端における光学系全体の焦点距離をｆｗとしたとき
１．１＜｜ｆ１／ｆｗ｜＜１．４ ‥‥‥（１）
０．８＜ ｆ２／ｆｗ ＜１．０ ‥‥‥（２）
の条件を満足している。一般に広角域を含むズームレンズは前玉径が大となりやすく、これが重量アップの主因となっている。これを抑制する為には、最も物体側に負の屈折力を集中させ、第１レンズ群を通過後の軸外光線が光軸となす角度を小とすれば良い。言い換えると、絞りから第１レンズ群を見たときに軸外光線が光軸と小なる角度の光路を取っていれば第１レンズ群は大型化しないということである。この原理から、本発明では負の屈折力の第１レンズ群の最も物体側に２枚の負レンズを配置し、前玉径を小型化している。また第１レンズ群で発生する諸収差を軽減する為に、最も物体側の負レンズを物体側に凸面を向けたメニスカス状の負レンズとすることで、特に広角端における歪曲収差、コマ収差を補正しやすくしている。そして前記２枚の負レンズの像側に正レンズを配置することで、特に望遠端における球面収差を補正している。
Next, features of the present invention will be described. In the zoom lens of the present invention, the first lens group has a meniscus negative lens, a negative lens, and a positive lens with a convex surface facing the object side in order from the object side. The second lens group is composed of two positive lenses and one negative lens. The diaphragm is disposed in the vicinity of the third lens group, moves together with the third lens group, and satisfies the conditional expressions (1) and (2). That is, 1.1 <| f1 / fw | <1.4 (1) where fi is the focal length of the i-th lens group and fw is the focal length of the entire optical system at the wide-angle end.
0.8 <f2 / fw <1.0 (2)
The conditions are satisfied. In general, a zoom lens including a wide-angle region tends to have a large front lens diameter, which is a major cause of weight increase. In order to suppress this, the negative refracting power is concentrated on the most object side, and the angle formed by the off-axis light beam after passing through the first lens group and the optical axis should be small. In other words, when the first lens group is viewed from the stop, the first lens group does not increase in size if the off-axis light ray takes an optical path with an angle smaller than the optical axis. From this principle, in the present invention, two negative lenses are arranged closest to the object side of the first lens unit having a negative refractive power, and the front lens diameter is reduced. In addition, in order to reduce various aberrations generated in the first lens group, the negative lens closest to the object side is a meniscus negative lens having a convex surface facing the object side, so that distortion and coma aberration can be reduced particularly at the wide angle end. It is easy to correct. By arranging a positive lens on the image side of the two negative lenses, spherical aberration, particularly at the telephoto end, is corrected.
条件式（１）は第１レンズ群の焦点距離を適切に設定する為の条件である。一般に本発明のズームレンズのように、負レンズ群が先行するズームタイプ、いわゆるネガティブリードタイプのズームレンズは、前述したように負の屈折力の第１レンズ群の屈折力を強めると前玉径を小とするのに有利となる。しかしながら負の屈折力の第１レンズ群の屈折力を強めすぎると、特に広角端における歪曲収差、コマ収差、像面湾曲の補正が困難となるうえ、望遠端でテレフォトタイプの屈折力配置をとりづらくなる為、望遠端で明るいＦナンバーを確保することが困難となる。条件式（１）は上記理由を鑑みて設定されており、上限値を超えると、光学系全体を小型化することが困難となり、下限値を越えると広角端における歪曲収差、コマ収差、像面湾曲の補正が困難となる。そして望遠端でテレフォトタイプの屈折力配置をとりづらくなることから、望遠端で明るいＦナンバーを確保することが困難となる。望ましくは前記第１レンズ群を物体側から順に物体側に凸面を向けたメニスカス状の負レンズ、両レンズ面が凹面の負レンズ、物体側に凸面を向けたメニスカス状の正レンズで構成すると上記効果が更に得易くなる。 Conditional expression (1) is a condition for appropriately setting the focal length of the first lens group. In general, as in the zoom lens of the present invention, a zoom type preceded by a negative lens group, that is, a so-called negative lead type zoom lens has a front lens diameter when the refractive power of the first lens group having a negative refractive power is increased as described above. It is advantageous to reduce However, if the refractive power of the first lens unit having a negative refractive power is increased too much, it becomes difficult to correct distortion, coma, and field curvature, especially at the wide-angle end, and a telephoto type refractive power arrangement at the telephoto end. Since it becomes difficult to obtain, it becomes difficult to secure a bright F number at the telephoto end. Conditional expression (1) is set in view of the above reason. If the upper limit is exceeded, it becomes difficult to downsize the entire optical system. If the lower limit is exceeded, distortion, coma, It becomes difficult to correct the curvature. Since it is difficult to arrange a telephoto type refractive power arrangement at the telephoto end, it is difficult to secure a bright F number at the telephoto end. Desirably, the first lens group includes a meniscus negative lens having a convex surface directed toward the object side in order from the object side, a negative lens having concave surfaces on both lens surfaces, and a meniscus positive lens having a convex surface directed toward the object side. It becomes easier to obtain the effect.
さらに本発明では前記目的を達成するために、正の屈折力の第２レンズ群を適切なレンズ構成とした。第２発明のズームタイプの場合、正の屈折力の第２レンズ群は主変倍群であると同時に、広角端から望遠端を通じて光学系全体の正の屈折力を最も大きく担っているレンズ群であり、比較的強い屈折力が必要である。その為には、第２レンズ群に複数枚の正簾図を配置すればよいが、レンズ枚数を増やしすぎると第２レンズ群の軸上厚が厚くなるため、絞りと第１レンズ群の距離が大となってしまい、その結果第２レンズ群のみならず第１レンズ群までもが大型化する傾向となる。これを鑑みて本発明では、前記正の屈折力の第２レンズ群は２枚の正レンズと１枚の負レンズを配置しただけのシンプルな構成としている。この構成において前記１枚の負レンズは２枚の正レンズで発生した諸収差、特に望遠端における球面収差を補正する役割を担っている。条件式（２）は上記に基づき、本発明の第２レンズ群のレンズ構成に好適な焦点距離に設定する条件である。上限値を越えると、必要な変倍比を確保するのが困難となったり、望遠端でテレフォトタイプの屈折力配置をとりづらくなることから、望遠端で明るいＦナンバーを確保することが困難となる。下限値を越えると、特に望遠端における球面収差を補正するのが困難となる。 Further, in the present invention, in order to achieve the above object, the second lens group having a positive refractive power has an appropriate lens configuration. In the zoom type according to the second aspect of the invention, the second lens group having a positive refractive power is the main variable power group, and at the same time, the lens group that bears the largest positive refractive power of the entire optical system from the wide-angle end to the telephoto end. And a relatively strong refractive power is required. For this purpose, a plurality of orthographic views may be arranged in the second lens group. However, if the number of lenses is increased too much, the axial thickness of the second lens group increases, so the distance between the aperture and the first lens group. As a result, not only the second lens group but also the first lens group tends to increase in size. In view of this, in the present invention, the second lens group having the positive refractive power has a simple configuration in which only two positive lenses and one negative lens are arranged. In this configuration, the single negative lens has a role of correcting various aberrations generated by the two positive lenses, particularly spherical aberration at the telephoto end. Conditional expression (2) is a condition for setting a focal length suitable for the lens configuration of the second lens group of the present invention based on the above. If the upper limit is exceeded, it will be difficult to secure the necessary zoom ratio, and it will be difficult to secure a telephoto type refractive power arrangement at the telephoto end, making it difficult to ensure a bright F number at the telephoto end. It becomes. If the lower limit is exceeded, it becomes difficult to correct spherical aberration, particularly at the telephoto end.
更に本発明では、前記目的を達成するために、絞りを適切な位置に配置した。第２発明のズームレンズは、望遠端で第１レンズ群と第２レンズ群が近接して合成屈折力が正の前群を形成している。そして前記前群から像面方向に間隔をあけて第３レンズ群と第４レンズ群が近接して合成屈折力が負の後群を形成した屈折力配置となっている。この屈折力配置ではＦｎｏ光束が前群によって収斂するので、絞りを前群から像面方向に間隔をあけて配置すれば絞り径を小とでき、絞りのメカ機構の大型化や複雑化からくる光学装置全系の大型化を防ぐことができる。一方広角端では第１レンズ群が負の屈折力の前群として配置されている。前記前群から像面方向に間隔をあけて、近接した第２レンズ群と第３レンズ群が合成屈折力が正の中間群を形成している。さらに前記中間群から間隔をあけて第４レンズ群が正の屈折力の後群として配置された屈折力配置となっている。この屈折力配置では、前記中間群近傍に絞りを配置すると、前玉径と後玉径のバランスがとれ、光学系全系の小型化の面で有利となる。本発明では上記の理由から、絞りを第３レンズ群近傍に配置し、光学装置全系の小型化やコストダウンに有利な構成にしている。本発明において望ましくは条件式（１），（２）を以下の範囲にすると良い。 Furthermore, in the present invention, in order to achieve the above object, the diaphragm is disposed at an appropriate position. In the zoom lens of the second invention, the first lens group and the second lens group are close to each other at the telephoto end to form a front group having a positive combined refractive power. The third lens group and the fourth lens group are close to each other in the image plane direction from the front group, and a refractive power arrangement is formed in which a combined rear power forms a negative rear group. With this refractive power arrangement, the Fno light beam is converged by the front group, so if the diaphragm is arranged at a distance from the front group in the image plane direction, the diameter of the diaphragm can be reduced, resulting in an increase in size and complexity of the mechanical mechanism of the diaphragm. An increase in the size of the entire optical device can be prevented. On the other hand, at the wide angle end, the first lens group is disposed as a front group having a negative refractive power. The second lens group and the third lens group which are close to each other with a space in the image plane direction from the front group form an intermediate group having a positive combined refractive power. Further, the fourth lens group is arranged as a rear group having a positive refractive power at a distance from the intermediate group. In this refracting power arrangement, if a stop is arranged in the vicinity of the intermediate group, the front lens diameter and the rear lens diameter are balanced, which is advantageous in terms of downsizing the entire optical system. In the present invention, for the reasons described above, the stop is disposed in the vicinity of the third lens group, which is advantageous for downsizing and cost reduction of the entire optical apparatus. In the present invention, conditional expressions (1) and (2) are preferably set in the following ranges.
１．２＜｜ｆ１／ｆｗ｜＜１．４ ‥‥‥（１）′
０．９＜ ｆ２／ｆｗ ＜１．０ ‥‥‥（２）′
本発明のズームレンズは以上のような条件を満足することにより実現されるが、更にレンズ全長の短縮を図りつつ、良好な光学性能を達成する為には、以下の条件のうち少なくとも１つを満足することが望ましい。
1.2 <| f1 / fw | <1.4 (1) ′
0.9 <f2 / fw <1.0 (2) ′
The zoom lens according to the present invention is realized by satisfying the above conditions. In order to achieve good optical performance while further reducing the overall length of the lens, at least one of the following conditions is satisfied. It is desirable to be satisfied.
（イ−１）前記絞りは第３レンズ群の物体側に配置されていることである。前記絞りを前記第３レンズ群の物体側に配置すると、上記効果と第３レンズ群を保持する鏡筒の構造の簡略化が同時に達成できて良い。 (A-1) The diaphragm is disposed on the object side of the third lens group. If the stop is disposed on the object side of the third lens group, the above effect and simplification of the structure of the lens barrel that holds the third lens group may be achieved at the same time.
（イ−２）前記第２レンズ群と第４レンズ群は変倍の際、一体に移動することである。変倍の際、前記第２レンズ群と前記第４レンズ群を一体移動にすれば、鏡筒構造が簡略化して良い。 (B-2) The second lens group and the fourth lens group move together when zooming. If the second lens group and the fourth lens group are moved together during zooming, the lens barrel structure may be simplified.
（イ−３）前記第３レンズ群は正レンズ、負レンズ、各１枚で構成され、且つ
１．５＜｜ｆ３／ｆｗ｜＜３．０ ‥‥‥（３）
の条件を満足することである。条件式（３）は第３レンズ群の焦点距離を適切に設定したものであり、上限値を越えると、望遠端で第３レンズ群と第４レンズ群の合成屈折力を十分な負の屈折力にすることが困難となる。そしてテレフォトタイプの屈折力配置をとりづらくなることから、望遠端で明るいＦナンバーを確保することが困難となる。下限値を越えると、焦点距離全域にわたって特にコマ収差と歪曲収差の補正が困難となる。望ましくは条件式（３）を以下の範囲にすると良い。
(A-3) The third lens group includes a positive lens and a negative lens, and 1.5 <| f3 / fw | <3.0 (3)
The above condition is satisfied. Conditional expression (3) appropriately sets the focal length of the third lens group. If the upper limit is exceeded, the combined refractive power of the third lens group and the fourth lens group is sufficiently negative at the telephoto end. It becomes difficult to use it. And since it becomes difficult to arrange a telephoto type refractive power arrangement, it is difficult to secure a bright F number at the telephoto end. Exceeding the lower limit makes it difficult to correct coma and distortion over the entire focal length. Desirably, conditional expression (3) should be in the following range.
１．７＜｜ｆ３／ｆｗ｜＜２．６ ‥‥‥（３）′
（イ−４）前記第４レンズ群は正レンズ、負レンズ各１枚で構成され、
２．５＜ｆ４／ｆｗ＜８．０ ‥‥‥（４）
の条件を満足することである。上限値を越えると、望遠端で特に球面収差の補正が困難となり、下限値を越えると、広角端で負の歪曲収差の補正が困難となる。望ましくは条件式（４）を以下の範囲にすると良い。
1.7 <| f3 / fw | <2.6 (3) ′
(A-4) The fourth lens group is composed of one positive lens and one negative lens.
2.5 <f4 / fw <8.0 (4)
The above condition is satisfied. When the upper limit is exceeded, it is difficult to correct spherical aberration, especially at the telephoto end, and when the lower limit is exceeded, it becomes difficult to correct negative distortion at the wide angle end. Desirably, conditional expression (4) should be in the following range.
２．８＜ｆ４／ｆｗ＜７．０ ‥‥‥（４）′
（イ−５）前記第２レンズ群は負レンズと正レンズの接合レンズを有し、第ｉレンズ群の接合レンズの正レンズの材質のアッベ数をνｉｐ、第ｉレンズ群の接合レンズの負レンズの材質のアッベ数をνｉｎとしたとき
２０＜ν２ｐ−ν２ｎ ‥‥‥（５）
の条件を満足することである。第２レンズ群に負レンズと正レンズの接合レンズを配置し、条件式（１１）を満足することで、望遠端における負の軸上色収差を良好に補正し易くなる。条件式（５）は前記接合レンズの負レンズと正レンズのアッベ数を規定したものであり、条件を外れると、望遠端における負の軸上色収差を良好に補正するのが困難となる。望ましくは条件式（５）を以下の範囲にすると良い。
2.8 <f4 / fw <7.0 (4) ′
(A-5) The second lens group has a negative lens and a positive lens cemented lens, the positive lens material Abbe number of the i-th lens group is νip, and the negative lens of the i-th lens group is a negative lens. When the Abbe number of the lens material is νin, 20 <ν2p−ν2n (5)
The above condition is satisfied. By arranging a cemented lens of a negative lens and a positive lens in the second lens group and satisfying conditional expression (11), it becomes easy to satisfactorily correct negative axial chromatic aberration at the telephoto end. Conditional expression (5) defines the Abbe numbers of the negative lens and the positive lens of the cemented lens. If the condition is not satisfied, it is difficult to satisfactorily correct negative axial chromatic aberration at the telephoto end. Desirably, conditional expression (5) should be in the following range.
２５＜ν２ｐ−ν２ｎ ‥‥‥（５）′
（イ−６）前記第３レンズ群は負レンズと正レンズの接合レンズを有し、第ｉレンズ群の接合レンズの正レンズの材質の屈折率をＮｉｐとする。第ｉレンズ群の接合レンズの負レンズの材質の屈折率をＮｉｎとする。第ｉレンズ群の接合レンズの正レンズの材質のアッベ数をνｉｐとする。第ｉレンズ群の接合レンズの負レンズの材質のアッベ数をνｉｎとしたとき
４．０ ＜ν３ｎ−ν３ｐ＜１２．０ ‥‥‥（６）
０．０５＜Ｎ３ｐ−Ｎ３ｎ＜０．２０ ‥‥‥（７）
の条件を満足することである。第３レンズ群に接合レンズを配置し、条件式（６），（７）を満足することで、全焦点距離にわたる色収差と球面収差、コマ収差を良好に補正し易くなる。
25 <ν2p−ν2n (5) ′
(A-6) The third lens group has a cemented lens of a negative lens and a positive lens, and the refractive index of the material of the positive lens of the cemented lens of the i-th lens group is Nip. The refractive index of the negative lens material of the cemented lens of the i-th lens group is Nin. The Abbe number of the positive lens material of the cemented lens of the i-th lens group is νip. When the Abbe number of the negative lens material of the cemented lens of the i-th lens group is νin, 4.0 <ν3n−ν3p <12.0 (6)
0.05 <N3p-N3n <0.20 (7)
The above condition is satisfied. By arranging a cemented lens in the third lens group and satisfying conditional expressions (6) and (7), it becomes easy to satisfactorily correct chromatic aberration, spherical aberration, and coma aberration over the entire focal length.
条件式（６）は第３レンズ群の接合レンズの負レンズと正レンズの材質のアッベ数を適切に設定したものである。そして上限値を越えると軸上色収差が補正過剰となり、特に望遠端において第１レンズ群と第２レンズ群で残存した軸上色収差と相殺させ、光学系全系での軸上色収差を良好に補正することが困難となる。下限値を越えると軸上色収差が補正不足となり、特に広角端で軸上色収差を良好に補正することが困難となる。条件式（７）は第３レンズ群の接合レンズの負レンズと正レンズの材質の屈折率を適切に設定したものである。そして上限値を越えると接合面における正の屈折力が強くなりすぎて、第３レンズ群全体の負の屈折力の維持が困難となる。その結果、光学系全系で十分な変倍比を確保するのが困難となる。下限値を越えると接合レンズ面における正の屈折力が弱くなりすぎて第３レンズ群で発生するコマ収差を接合面でキャンセルすることが困難となる。望ましくは、条件式（６），（７）を以下の範囲とすると良い。 Conditional expression (6) appropriately sets the Abbe number of the material of the negative lens and the positive lens of the cemented lens of the third lens group. When the upper limit is exceeded, the axial chromatic aberration is overcorrected, and in particular, the axial chromatic aberration remaining in the first lens group and the second lens group at the telephoto end is offset and the axial chromatic aberration in the entire optical system is corrected well. Difficult to do. When the lower limit is exceeded, the axial chromatic aberration is insufficiently corrected, and it becomes difficult to satisfactorily correct the axial chromatic aberration particularly at the wide angle end. Conditional expression (7) appropriately sets the refractive indexes of the materials of the negative lens and the positive lens of the cemented lens of the third lens group. If the upper limit is exceeded, the positive refractive power at the cemented surface becomes too strong, and it becomes difficult to maintain the negative refractive power of the entire third lens group. As a result, it becomes difficult to ensure a sufficient zoom ratio in the entire optical system. If the lower limit is exceeded, the positive refractive power at the cemented lens surface becomes too weak, and it becomes difficult to cancel coma aberration generated at the third lens group at the cemented surface. Desirably, conditional expressions (6) and (7) should be in the following ranges.
５．０ ＜ν３ｎ−ν３ｐ＜１０．０ ‥‥‥（６）′
０．０８＜Ｎ３ｐ−Ｎ３ｎ＜０．１７ ‥‥‥（７）′
（イ−７）前記第４レンズ群は少なくとも１つの非球面を有していることである。第４レンズ群に非球面を用いると、広角端における像面湾曲、歪曲収差、望遠端における球面収差の補正が容易となって良い。望ましくは、前記非球面を光軸から離れるにしたがって負の屈折力が強まるようにすると良い。
5.0 <ν3n−ν3p <10.0 (6) ′
0.08 <N3p-N3n <0.17 (7) '
(A-7) The fourth lens group has at least one aspherical surface. If an aspheric surface is used for the fourth lens group, it is possible to easily correct curvature of field, distortion at the wide-angle end, and spherical aberration at the telephoto end. Desirably, the negative refractive power increases as the aspherical surface moves away from the optical axis.
（イ−８）前記第４レンズ群はプラスチック非球面レンズを有していることである。前記非球面を、プラスティックレンズに施すと製作の面で有利となって良い。 (A-8) The fourth lens group has a plastic aspheric lens. When the aspheric surface is applied to a plastic lens, it may be advantageous in terms of manufacturing.
次に本発明の数値実施例を示す。数値実施例においてＲｉは物体側より順に第ｉ番目の面の曲率半径、Ｄｉは第ｉ番目の光学部材厚又は空気間隔、Ｎｉとνｉは第ｉ番目の光学部材の屈折率とアッベ数である。又、非球面形状はレンズ面の中心部の曲率半径Ｒとし、光軸方向（光の進行方向）をＸ軸とし、光軸と垂直方向をＹ軸とし、Ｂ，Ｃ，Ｄ，Ｅをそれぞれ非球面係数としたとき Next, numerical examples of the present invention will be shown. In numerical examples, Ri is the radius of curvature of the i-th surface in order from the object side, Di is the thickness or air spacing of the i-th optical member, and Ni and νi are the refractive index and Abbe number of the i-th optical member. . The aspherical shape is the radius of curvature R at the center of the lens surface, the optical axis direction (light traveling direction) is the X axis, the Y axis is the direction perpendicular to the optical axis, and B, C, D, E are respectively Aspheric coefficient
で表されるものとする。尚、「ｅ−ｘ」は「×１０-X」を表す。また前述の各条件式の一部と数値実施例における諸数値との関係を表−１，表−２に示す。 It shall be represented by “ Ex ” represents “× 10 −X ”. Tables 1 and 2 show the relationship between some of the conditional expressions described above and various numerical values in the numerical examples.
Ｌ１は第１群 Ｌ２は第２群 Ｌ３は第３群 Ｌ４は第４群 ＳＰは絞り ＦＣはフレアーカット絞り ＩＰは像面 ｄはｄ線 ｇはｇ線 ΔＳはサジタル像面 ΔＭはメリディオナル像面 L1 is the first group L2 is the second group L3 is the third group L4 is the fourth group SP is the diaphragm FC is the flare-cut diaphragm IP is the d-line g is the g-line ΔS is the sagittal image plane ΔM is the meridional image plane
Claims (9)
１．１＜｜ｆ１／ｆｗ｜＜１．４
０．８＜ ｆ２／ｆｗ ＜１．０
の条件を満足することを特徴とするズームレンズ。 In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power, When zooming from the telephoto end to the telephoto end, the first lens group moves along a convex locus toward the image side, and the second lens group moves toward the object side so that the distance from the first lens group is reduced. The third lens group moves toward the object side so that the distance from the second lens group increases, and the fourth lens group moves toward the object side so that the distance from the third lens group decreases. The first lens group includes, in order from the object side, a meniscus negative lens having a convex surface facing the object side, a negative lens, and a positive lens. The second lens group includes two positive lenses and one lens. It is composed of a negative lens, the stop is disposed on the object side of the third lens group, and the third lens group Go to the body, the focal length of the i-th lens unit fi, when the focal length of the entire optical system was fw at the wide-angle end 1.1 <| f1 / fw | <1.4
0.8 <f2 / fw <1.0
A zoom lens that satisfies the following conditions.
１．５＜｜ｆ３／ｆｗ｜＜３．０
の条件を満足することを特徴とする請求項１または２に記載のズームレンズ。 The third lens group includes a positive lens, a negative lens, and one each.
1.5 <| f3 / fw | <3.0
The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition.
２．５＜ｆ４／ｆｗ＜８．０
の条件を満足することを特徴とする請求項１乃至３のいずれか１項に記載のズームレンズ。 The fourth lens group includes one positive lens and one negative lens,
2.5 <f4 / fw <8.0
The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition.
２０＜ν２ｐ−ν２ｎ
の条件を満足することを特徴とする請求項１乃至４のいずれか１項に記載のズームレンズ。 The second lens group includes a cemented lens of a negative lens and a positive lens, the Abbe number of the material of the positive lens of the cemented lens of the i-th lens group is νip, and the Abbe of the material of the negative lens of the cemented lens of the i-th lens group When the number is νin, 20 <ν2p−ν2n
The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition.
４．０ ＜ν３ｎ−ν３ｐ＜１２．０
０．０５＜Ｎ３ｐ−Ｎ３ｎ＜０．２０
の条件を満足することを特徴とする請求項１乃至５のいずれか１項に記載のズームレンズ。 The third lens group includes a cemented lens of a negative lens and a positive lens, the refractive index of the material of the positive lens of the cemented lens of the i-th lens group is Nip, and the refraction of the material of the negative lens of the cemented lens of the i-th lens group. When the ratio is Nin, the Abbe number of the positive lens material of the cemented lens of the i-th lens group is νip, and the Abbe number of the material of the negative lens of the cemented lens of the i-th lens group is νin, 4.0 <ν3n−ν3p < 12.0
0.05 <N3p-N3n <0.20
The zoom lens according to claim 1, wherein the following condition is satisfied.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009203574A JP4586102B2 (en) | 2009-09-03 | 2009-09-03 | Zoom lens |
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| JP2009203574A JP4586102B2 (en) | 2009-09-03 | 2009-09-03 | Zoom lens |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14622999A Division JP4392901B2 (en) | 1999-05-26 | 1999-05-26 | Zoom lens |
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| JP2009282554A true JP2009282554A (en) | 2009-12-03 |
| JP4586102B2 JP4586102B2 (en) | 2010-11-24 |
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| CN104101989A (en) * | 2014-08-04 | 2014-10-15 | 江苏卡罗卡国际动漫城有限公司 | Fish-eye lens for doublet lens |
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|---|---|---|---|---|
| JPH04235514A (en) * | 1991-01-11 | 1992-08-24 | Nikon Corp | Super-wide angle zoom lens |
| JPH04235515A (en) * | 1991-01-11 | 1992-08-24 | Nikon Corp | Super-wide angle zoom lens |
| JPH0519170A (en) * | 1991-02-15 | 1993-01-29 | Asahi Optical Co Ltd | Zoom lens |
| JPH05173071A (en) * | 1991-12-25 | 1993-07-13 | Nikon Corp | Wide angle zoom lens |
| JPH05241073A (en) * | 1992-02-28 | 1993-09-21 | Canon Inc | Zoom lens |
| JPH05313065A (en) * | 1992-05-11 | 1993-11-26 | Canon Inc | Zoom lens |
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| JPH07261084A (en) * | 1994-03-17 | 1995-10-13 | Canon Inc | Zoom lens |
| JPH07287168A (en) * | 1994-04-19 | 1995-10-31 | Nikon Corp | Zoom lens with high power variation rate |
| JPH0886964A (en) * | 1994-09-19 | 1996-04-02 | Canon Inc | Zoom lens |
| JPH10253885A (en) * | 1997-03-13 | 1998-09-25 | Nikon Corp | Wide angle zoom lens system |
| JP2000305017A (en) * | 1999-04-20 | 2000-11-02 | Olympus Optical Co Ltd | High variable power zoom lens |
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2009
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235514A (en) * | 1991-01-11 | 1992-08-24 | Nikon Corp | Super-wide angle zoom lens |
| JPH04235515A (en) * | 1991-01-11 | 1992-08-24 | Nikon Corp | Super-wide angle zoom lens |
| JPH0519170A (en) * | 1991-02-15 | 1993-01-29 | Asahi Optical Co Ltd | Zoom lens |
| JPH05173071A (en) * | 1991-12-25 | 1993-07-13 | Nikon Corp | Wide angle zoom lens |
| JPH05241073A (en) * | 1992-02-28 | 1993-09-21 | Canon Inc | Zoom lens |
| JPH0611650A (en) * | 1992-03-10 | 1994-01-21 | Nikon Corp | Zoom lens |
| JPH05313065A (en) * | 1992-05-11 | 1993-11-26 | Canon Inc | Zoom lens |
| JPH07261084A (en) * | 1994-03-17 | 1995-10-13 | Canon Inc | Zoom lens |
| JPH07287168A (en) * | 1994-04-19 | 1995-10-31 | Nikon Corp | Zoom lens with high power variation rate |
| JPH0886964A (en) * | 1994-09-19 | 1996-04-02 | Canon Inc | Zoom lens |
| JPH10253885A (en) * | 1997-03-13 | 1998-09-25 | Nikon Corp | Wide angle zoom lens system |
| JP2000305017A (en) * | 1999-04-20 | 2000-11-02 | Olympus Optical Co Ltd | High variable power zoom lens |
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|---|---|
| JP4586102B2 (en) | 2010-11-24 |
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