JP2001083421A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JP2001083421A JP2001083421A JP26287099A JP26287099A JP2001083421A JP 2001083421 A JP2001083421 A JP 2001083421A JP 26287099 A JP26287099 A JP 26287099A JP 26287099 A JP26287099 A JP 26287099A JP 2001083421 A JP2001083421 A JP 2001083421A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- group
- refractive power
- zoom
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はズームレンズに関
し、特に１眼レフカメラなどに利用されるズームレンズ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens, and more particularly to a zoom lens used for a single-lens reflex camera or the like.
【０００２】[0002]
【従来の技術】一般に、ズームレンズの屈折力配置にお
いて、負の屈折力の群が先行する、負・正・負・正方式
の屈折力配置は、広角ズーム、とくに、明るい広角ズー
ムに多く見られる構成である。そして、通常、負・正・
負・正配置のズームレンズは、球面レンズのみで構成さ
れていた。2. Description of the Related Art In general, a negative / positive / negative / positive refractive power arrangement in which a group of negative refractive powers precedes a refractive power arrangement of a zoom lens is often seen in a wide-angle zoom, particularly a bright wide-angle zoom. Configuration. And usually, negative, positive,
The zoom lens in the negative / positive arrangement was constituted only by a spherical lens.
【０００３】[0003]
【発明が解決しようとする課題】しかし、球面系のみで
構成すると、望遠側の球面収差、広角側の像面湾曲、歪
曲収差の補正が困難になる。これらを補正しようとする
と、第１レンズ群の負の屈折力を弱めざるを得ないた
め、光学系が長くなり、また、大口径比化することが困
難になる。また、望遠側の球面収差のみを補正しようと
すると、第１レンズ群の負の屈折力を強めざるを得なく
なり、広角側の像面湾曲、歪曲収差が更に補正困難とな
ってしまう。However, if only a spherical system is used, it becomes difficult to correct spherical aberration on the telephoto side, field curvature on the wide-angle side, and distortion. To correct them, the negative refractive power of the first lens group must be reduced, so that the optical system becomes longer and it becomes difficult to increase the aperture ratio. Further, if only the spherical aberration on the telephoto side is to be corrected, the negative refractive power of the first lens unit must be increased, and it becomes more difficult to correct the field curvature and distortion on the wide-angle side.
【０００４】このために、上記球面レンズのみでの構成
ではなく、非球面レンズを含んだ構成のズームレンズも
提案されている。たとえば、特開平１０−８２９５４号
公報が知られている。しかしこれは、第１レンズ群中
で、非球面を１枚のみしか使用していない為、非球面の
効果が少なく、第１レンズ群の大きさを大きくせざるを
得なかった。For this reason, a zoom lens having a configuration including an aspherical lens has been proposed instead of the configuration using only the spherical lens. For example, JP-A-10-82954 is known. However, since only one aspherical surface is used in the first lens unit, the effect of the aspherical surface is small, and the size of the first lens unit must be increased.
【０００５】本発明は、上記のような課題に鑑みてなさ
れたものであり、より高性能な大口径比の広角ズームレ
ンズを提供することを目的とする。The present invention has been made in view of the above problems, and has as its object to provide a higher performance wide-angle zoom lens having a large aperture ratio.
【０００６】[0006]
【発明を解決するための手段】上記の課題を解決するた
め、本発明では、物体側より順に、負の屈折力を有する
第１レンズ群と、正の屈折力を有する第２レンズ群と、
負の屈折力を有する第３レンズ群と、正の屈折力を有す
る第４レンズ群を備えたズームレンズにおいて、前記第
１レンズ群は少なくとも２つの非球面を有し、以下の条
件式を満足することを特徴とするズームレンズ。According to the present invention, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a second lens unit having a positive refractive power are arranged in order from the object side.
In a zoom lens including a third lens group having a negative refractive power and a fourth lens group having a positive refractive power, the first lens group has at least two aspheric surfaces and satisfies the following conditional expression. A zoom lens.
【０００７】１．０ ＞｜ｆ１／ｆ２｜ ＞ ０．０ ただし、 ｆ１：前記第１レンズ群中の、非球面を有するレンズの
うち、最も物体側に位置するレンズＬ１の焦点距離 ｆ２：前記第１レンズ群中の、非球面を有するレンズの
うち、物体側から２番目に位置するレンズＬ２の焦点距
離 また、物体側より順に、負の屈折力を有する第１レンズ
群と、正の屈折力を有する第２レンズ群と、負の屈折力
を有する第３レンズ群と、正の屈折力を有する第４ンズ
群とを備え、前記第２レンズ群と前記第３レンズ群との
間、あるいは前記第３レンズ群中に開口絞りを有するズ
ームレンズにおいて、前記第４レンズ群は少なくとも１
つの非球面を有し、前記第４レンズ群中の非球面は以下
の条件式（３）乃至（４）を満足することを特徴とする
ズームレンズを構成する。 （３） ０．４ ＜ （ＬaaＴ／ＬaiＴ）／（ＬaaＷ／ＬaiＷ）≦ １．０ （４） １．６５ ＜ ｎｓ ただし、 ＬaiＷ：広角端における前記開口絞りから像面までの距
離 ＬaiＴ：望遠端における前記開口絞りから像面までの距
離 ＬaaＷ：広角端における前記開口絞りから前記第４レン
ズ群中の非球面までの光軸上の距離 ＬaaＴ：望遠端における前記開口絞りから前記第４レン
ズ群中の非球面までの光軸上の距離 ｎｓ：前記第４レンズ群中の非球面を有するレンズを構
成するガラスの、ｄ線（588nm）における屈折率1.0> | f1 / f2 |> 0.0 where f1: the focal length of the lens L1 located closest to the object side among the aspherical lenses in the first lens group. The focal length of the lens L2 located second from the object side among the lenses having an aspheric surface in the first lens group. Also, in order from the object side, a first lens group having a negative refractive power and a positive refraction A second lens group having a power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power, between the second lens group and the third lens group, Alternatively, in the zoom lens having an aperture stop in the third lens group, the fourth lens group has at least one lens.
The zoom lens has two aspheric surfaces, and the aspheric surfaces in the fourth lens group satisfy the following conditional expressions (3) to (4). (3) 0.4 <(LaaT / LaiT) / (LaaW / LaiW) ≦ 1.0 (4) 1.65 <ns where LaiW: distance from the aperture stop at the wide-angle end to the image plane LaiT: telephoto end LaaW: distance on the optical axis from the aperture stop at the wide-angle end to the aspherical surface in the fourth lens group at the wide-angle end LaaT: distance from the aperture stop at the telephoto end to the fourth lens group at the wide-angle end Distance on the optical axis to the aspherical surface of the lens ns: refractive index at d-line (588 nm) of the glass constituting the lens having the aspherical surface in the fourth lens group
【０００８】[0008]
【発明の実施の形態】本発明のような、物体側より順
に、負の屈折力を有する第１レンズ群と、正の屈折力を
有する第２レンズ群と、負の屈折力を有する第３ンズ群
と、正の屈折力を有する第４ンズ群を備えたズームレン
ズにおいて、負・正・負・正方式のズームレンズにおい
て、第１レンズ群中に少なくとも２枚の非球面を配置す
ることは、広角側の像面湾曲及び歪曲収差の補正を容易
にし、さらに、非球面を１面のみとするより、１面あた
りの非球面量を小さくすることが出来るので、製造上必
要なコストを小さくすることが出来る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As in the present invention, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power are arranged in this order from the object side. In a zoom lens having a lens group and a fourth lens group having a positive refractive power, at least two aspheric surfaces are arranged in the first lens group in a negative / positive / negative / positive zoom lens. Can easily correct curvature of field and distortion on the wide-angle side, and can reduce the amount of aspherical surface per surface as compared to using only one aspherical surface. Can be smaller.
【０００９】そしてさらに、広角側の像面湾曲、及び歪
曲収差を良好に補正するために、条件式（１）を満足す
ることが必要である。この条件式は、第１レンズ群中
の、非球面を有する複数のレンズのうち、最も物体側に
位置する二つのレンズの屈折力のバランスを規定するも
ので、これらのレンズの焦点距離の比を表わしている。
即ち、条件式（１）式は、レンズＬ１がレンズＬ２より
強い屈折力を持ち、また、レンズＬ２の屈折力が０でな
いことを示す。この条件式を満足することは、広角側の
周辺光の、光軸からの高さが最も大きな第１レンズ群の
うち、より物体側に位置するレンズ成分に非球面を導入
し、かつ、その屈折力を大きくすることを意味し、各収
差を良好に補正することが可能であって、特に、広角側
の像面湾曲、歪曲収差を有効に補正することができる。
また、第１レンズ群中に少なくとも２面の非球面を配置
することにより、１面では非球面量が大きく製造が困難
な非球面になってしまうような場合でも、二面の非球面
に負荷が分散され、製造が容易になり、さらに、広角端
から望遠端まで良好な収差補正が可能となる。Further, in order to favorably correct the field curvature and distortion on the wide-angle side, it is necessary to satisfy conditional expression (1). This conditional expression defines the balance between the refractive powers of the two lenses closest to the object side among a plurality of lenses having an aspheric surface in the first lens group, and defines the ratio of the focal lengths of these lenses. Is represented.
That is, the conditional expression (1) indicates that the lens L1 has a stronger refractive power than the lens L2, and that the refractive power of the lens L2 is not zero. Satisfying this conditional expression is achieved by introducing an aspheric surface to a lens component located closer to the object side in the first lens group having the largest height from the optical axis of the ambient light on the wide-angle side, and This means that the refractive power is increased, and each aberration can be satisfactorily corrected. In particular, field curvature and distortion on the wide-angle side can be effectively corrected.
Further, by arranging at least two aspheric surfaces in the first lens unit, even if one aspherical surface has a large amount of aspherical surface and is difficult to manufacture, a load is applied to the two aspherical surfaces. Are dispersed, manufacturing becomes easy, and good aberration correction is possible from the wide-angle end to the telephoto end.
【００１０】次にレンズＬ１及びＬ２は、以下の条件式
（２）を満足することが望ましい。 （２） ０．９＜ ｎ１／ｎ２ ＜１．１ ただし、 ｎ１：前記レンズＬ１を構成するガラスの、ｄ線（588n
m）における屈折率 ｎ２：前記レンズＬ２を構成するガラスの、ｄ線（588n
m）における屈折率 条件式（２）は、レンズＬ１及びＬ２を構成するガラス
の、ｄ線（５８８ｎｍ）における屈折率の比を表わす。
この条件式（２）を満足することにより、非球面を有す
るレンズＬ１及びＬ２の屈折率の差が少なくなり、２枚
のレンズの間に不必要な色消し効果を発生させず、非球
面形状により各色ごとの収差補正のみを行うことができ
る。Next, it is desirable that the lenses L1 and L2 satisfy the following conditional expression (2). (2) 0.9 <n1 / n2 <1.1, where n1: d line (588n) of the glass constituting the lens L1
n2: d-line (588n) of the glass constituting the lens L2.
Refractive index in m) Conditional expression (2) represents the ratio of the refractive index of the glass constituting the lenses L1 and L2 at the d-line (588 nm).
By satisfying conditional expression (2), the difference between the refractive indices of the lenses L1 and L2 having an aspherical surface is reduced, and an unnecessary achromatic effect is not generated between the two lenses, and the aspherical shape is obtained. As a result, only aberration correction for each color can be performed.
【００１１】次に、第２レンズ群は前群と後群とに分割
され、また、そのうち前群を動かすことにより合焦を行
うことが望ましい。負・正・負・正方式のズームレンズ
の場合、合焦方式としては、前玉繰り出し方式、１群分
割合焦方式などが知られている。しかし、第１レンズ群
の屈折力が負のズームレンズの場合、第１レンズ群のレ
ンズ径が大きくなるため、第１レンズ群を駆動する方式
であると、大きな合焦群を動かさなければならず、駆動
系への負荷が大きくなってしまう。また、第２レンズ群
全体を動かして合焦を行う方式でも、第１レンズ群を駆
動する方式よりも負荷が小さいとはいえ十分ではない。
第２レンズ群の１部を動かして合焦をおこなうことは、
駆動系への付加が少なく、合焦の高速化に非常に有利で
ある。さらに、第２レンズ群の前群を合焦群とすること
で、特に合焦に伴う球面収差の変動を小さく押さえるこ
とができる。Next, the second lens group is divided into a front group and a rear group, and it is desirable to perform focusing by moving the front group. In the case of a negative / positive / negative / positive zoom lens, as a focusing method, a front lens feeding method, a one-group ratio focusing method, and the like are known. However, in the case of a zoom lens having a negative refractive power of the first lens group, the lens diameter of the first lens group becomes large. Therefore, if the first lens group is driven, a large focusing group must be moved. Therefore, the load on the drive system increases. Further, the method of performing focusing by moving the entire second lens group is not sufficient, though the load is smaller than the method of driving the first lens group.
Focusing by moving a part of the second lens group
The addition to the drive system is small, which is very advantageous for speeding up focusing. Further, by setting the front group of the second lens group as the focusing group, it is possible to suppress a variation in spherical aberration particularly due to focusing.
【００１２】次に、第２レンズ群の前群は、少なくとも
１つの接合正レンズを有することが望ましい。合焦群で
ある、第２レンズ群の前群に接合レンズを有すること
は、合焦に際しての色収差の変動を小さくすることが出
来る。次に、第４レンズ群は少なくとも１つの非球面を
有し、前記第４レンズ群中の非球面は、条件式（３）乃
至（４）を満足することが必要である。Next, it is desirable that the front group of the second lens group has at least one cemented positive lens. Having a cemented lens in the front group of the second lens group, which is the focusing group, can reduce variation in chromatic aberration during focusing. Next, the fourth lens group has at least one aspheric surface, and the aspheric surface in the fourth lens group needs to satisfy the conditional expressions (3) to (4).
【００１３】第４レンズ群に非球面を有すると、広角端
から望遠端の像面湾曲およびコマ収差を良好に補正でき
る。そして条件式（３）は、第１図に示すとおり、第４
レンズ群における非球面の位置を規定する条件式であ
る。条件式（３）の値が上限値を上回ると、同じ像高の
光線が第４レンズ群中の非球面を通過する高さが、広角
端よりも望遠端のほうが高くなってしまうため、中心部
と周辺部とで非球面量の異なる非球面では、広角端での
コマ収差の補正が不十分となってしまう。また、下限値
を下回ると、反対に望遠端における周辺光の高さが非球
面レンズの中心に近くなるため、望遠端の収差補正、特
に像面湾曲の補正が不十分になってしまう。従って、条
件式（３）の範囲に非球面を配することで、広角端から
望遠端まで、良好な収差補正を行うことができる。When the fourth lens unit has an aspherical surface, the curvature of field and coma from the wide-angle end to the telephoto end can be corrected well. Then, as shown in FIG. 1, the conditional expression (3)
It is a conditional expression which specifies the position of the aspherical surface in a lens group. If the value of conditional expression (3) exceeds the upper limit, the height at which the light beam having the same image height passes through the aspherical surface in the fourth lens unit is higher at the telephoto end than at the wide-angle end. In the case of an aspherical surface having a different amount of aspherical surface between the portion and the peripheral portion, the correction of coma at the wide-angle end becomes insufficient. On the other hand, below the lower limit, the height of the peripheral light at the telephoto end becomes closer to the center of the aspherical lens, so that the aberration correction at the telephoto end, particularly the correction of the field curvature, becomes insufficient. Therefore, by arranging the aspherical surface in the range of the conditional expression (3), it is possible to perform excellent aberration correction from the wide-angle end to the telephoto end.
【００１４】さらに、条件式（４）を満たすガラスを非
球面レンズに使用することにより、曲率半径の絶対値を
小さくすることなく、偏心等の影響を小さくし、かつ、
製造が容易な非球面形状とすることができる。次に、本
発明では、第４レンズ群中に、少なくとも一つの接合正
レンズを有することが望ましい。このような構成によ
り、広角端から望遠端への変倍にともなう色収差の変動
を小さく押さえることが可能になる。Further, by using a glass satisfying conditional expression (4) for the aspherical lens, the influence of eccentricity and the like can be reduced without reducing the absolute value of the radius of curvature, and
An aspherical shape that can be easily manufactured can be obtained. Next, in the present invention, it is desirable to include at least one cemented positive lens in the fourth lens group. With such a configuration, it is possible to reduce the variation in chromatic aberration due to zooming from the wide-angle end to the telephoto end.
【００１５】以下に、本発明にかかるズームレンズの実
施例について説明する。図２に、本発明の実施例１の広
角端における構成図を示す。実施例１は、物体側から順
に、第１面にガラスモールドによる非球面を有する負レ
ンズと、ガラスレンズの球面上に樹脂の薄層で非球面形
状を形成した非球面を有する正レンズと、負レンズと、
正レンズとからなる第１レンズ群Ｇ１と、正レンズと負
レンズとの接合正レンズから成る第２レンズ群前群Ｇ２
Ｆと、正レンズから成る第２レンズ群後群Ｇ２Ｒと、負
レンズと正レンズとの接合負レンズとからなる第３レン
ズ群Ｇ３と、正レンズと、負レンズと正レンズとの接合
正レンズと、第１面にガラスモールドによる非球面を有
する負レンズとからなる第４レンズ群Ｇ４とによって構
成される。An embodiment of the zoom lens according to the present invention will be described below. FIG. 2 is a configuration diagram at the wide-angle end according to the first embodiment of the present invention. Example 1 includes, in order from the object side, a negative lens having an aspheric surface formed by a glass mold on a first surface, a positive lens having an aspheric surface formed by forming a thin layer of resin on a spherical surface of a glass lens, A negative lens,
A first lens group G1 composed of a positive lens and a front group G2 of a second lens group composed of a cemented positive lens composed of a positive lens and a negative lens
F, a second lens group rear group G2R including a positive lens, a third lens group G3 including a negative lens cemented with a negative lens and a positive lens, and a positive lens cemented with a positive lens, a negative lens, and a positive lens. And a fourth lens group G4 including a negative lens having an aspheric surface made of a glass mold on the first surface.
【００１６】そして、広角端から望遠端へのズーミング
に伴い、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔
が減少し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間
隔が増加し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との
間隔が減少するように各レンズ群が移動する。第２レン
ズ群Ｇ２と第３レンズ群Ｇ３との間に配置された可変絞
りＳは、変倍に伴って第３レンズ群Ｇ３と１体に移動す
る。Then, with zooming from the wide-angle end to the telephoto end, the distance between the first lens group G1 and the second lens group G2 decreases, and the distance between the second lens group G2 and the third lens group G3 increases. Then, each lens group moves so that the distance between the third lens group G3 and the fourth lens group G4 decreases. The variable stop S disposed between the second lens group G2 and the third lens group G3 moves together with the third lens group G3 as the magnification changes.
【００１７】また、合焦に際しては、無限遠から至近距
離へ合焦する際は、第２レンズ群前群Ｇ２Ｆと第２レン
ズ群後群Ｇ２Ｒの間隔が減少するように前群が移動す
る。表１に本発明の実施例１の諸元を示す。表中のｒは
曲率半径、Ｄはレンズ中心厚および空気間隔、ｎはｄ線
（５８８ｎｍ）での屈折率、νはアッベ数、Ｆは焦点距
離、F.NOはＦナンバー、Ｂｆはバックフォーカスであ
る。また、面番号の左に付けられた＊は、その面が非球
面であることを表わす。In focusing, when focusing from infinity to a close distance, the front group moves so that the distance between the front group G2F of the second lens group and the rear group G2R of the second lens group decreases. Table 1 shows specifications of the first embodiment of the present invention. In the table, r is the radius of curvature, D is the thickness of the lens center and the air gap, n is the refractive index at the d-line (588 nm), ν is the Abbe number, F is the focal length, F.NO is the F number, and Bf is the back focus. It is. An asterisk added to the left of the surface number indicates that the surface is aspheric.
【００１８】第１レンズ群中の最も物体側のレンズの、
物体側のレンズ面は非球面であり、その形状は以下の式
で表わされる。 Ｘ＝（Ｙ2／Ｒ）／（１＋（１−κ・Ｙ2／Ｒ2）1/2）＋
Ｃ3・Ｙ3＋Ｃ4・Ｙ4＋Ｃ5・Ｙ5＋Ｃ6・Ｙ6＋Ｃ7・Ｙ7＋
Ｃ8・Ｙ8＋Ｃ9・Ｙ9＋Ｃ10・Ｙ10 また、第１レンズ群中の物体側から２番目のレンズの物
体側の面、および第４レンズ群中の最も像側に位置する
レンズの物体側の面は非球面であり、以下の式で表わさ
れる。The lens closest to the object in the first lens group is
The lens surface on the object side is an aspherical surface, and its shape is represented by the following equation. X = (Y 2 / R) / (1+ (1-κ · Y 2 / R 2) 1/2) +
C3 · Y 3 + C4 · Y 4 + C5 · Y 5 + C6 · Y 6 + C7 · Y 7 +
The C8 · Y 8 + C9 · Y 9 + C10 · Y 10, the object side of the lens closest to the image in the object side surface, and a fourth lens group of the second lens from the object side in the first lens group Is an aspheric surface and is represented by the following equation.
【００１９】Ｘ＝（Ｙ2／Ｒ）／（１＋（１−κ・Ｙ2／
Ｒ2）1/2）＋Ｃ4・Ｙ4＋Ｃ6・Ｙ6＋Ｃ8・Ｙ8＋Ｃ10・Ｙ
10 このとき、Ｘは非球面の、基準面からの光軸方向の変位
量、Ｙは光軸からの高さ、Ｒは非球面の近軸曲率半径、
κは円錐係数、Ｃnはn次の非球面係数をあらわす。X = (Y 2 / R) / (1+ (1−κ · Y 2 /
R 2) 1/2) + C4 · Y 4 + C6 · Y 6 + C8 · Y 8 + C10 · Y
10 At this time, X is the amount of displacement of the aspherical surface from the reference plane in the optical axis direction, Y is the height from the optical axis, R is the paraxial radius of curvature of the aspherical surface,
κ represents a conical coefficient, and Cn represents an n-th order aspherical coefficient.
【００２０】[0020]
【表１】 r D ν ｎ *1) 542.0779 3.0000 45.37 1.796681 2) 21.5687 12.6000 1.000000 *3) -218.5609 0.1700 56.34 1.495210 4) -125.0432 3.4000 49.45 1.772789 5) -173.0452 0.7000 1.000000 6) -100.0603 2.1500 33.89 1.803840 7) 46.5903 1.9000 1.000000 8) 46.3354 6.9000 25.35 1.805182 9) -275.3788 D9（可変） 10) 40.8188 1.5000 35.19 1.749501 11) 20.3123 6.9000 61.09 1.589130 12) -121.1836 D12（可変） 13) 71.9497 2.9000 48.04 1.716999 14) -362.0832 D14（可変） 絞り 15) -47.0470 1.5000 52.30 1.748099 16) 31.3570 3.0000 23.82 1.846660 17) 138.3354 D17（可変） 18) 35.3292 6.7000 82.52 1.497820 19) -73.2963 0.1000 1.000000 20) 70.8879 1.5000 25.35 1.805182 21) 21.3356 9.8000 82.52 1.497820 22) -47.4640 0.2000 1.000000 *23) -111.7388 2.0000 46.80 1.766840 24) -144.8669 〔非球面係数表〕 （第１面）κ＝ 20.0 Ｃ3＝-0.95109×10-5 Ｃ4＝ 1.68200×10-5 Ｃ5＝-0.32312×10-6 Ｃ6＝-6.37750×10-9 Ｃ7＝ 0.76231×10-10 Ｃ8＝ 6.38720×10-12 Ｃ9＝ 0.96455×10-13 Ｃ9＝-5.98570×10-15 （第３面）κ＝ 99.0 Ｃ4＝-9.55040×10-6 Ｃ6＝ 2.74750×10-8 Ｃ8＝-3.50950×10-11 Ｃ10＝ 4.88940×10-14 （第２３面）κ＝-10.0 Ｃ4＝-7.89980×10-6 Ｃ6＝-1.48800×10-8 Ｃ8＝ 3.10340×10-11 Ｃ10＝-9.56000×10-14 〔可変間隔表〕 f 17.50 24.00 34.00 F.NO 1/2.9 1/2.9 1/2.9 d9 21.825 9.781 0.938 d12 5.475 5.475 5.475 d14 5.052 12.515 20.768 d18 12.785 7.735 0.980 Bf 38.515 43.726 53.343 〔条件式対応値〕 ｆ１= −２８．２６７ ｆ２=２１２５．２０７ ｜ｆ１／ｆ２｜＝０．０１３３ ｎ１／ｎ２＝１．０１ ＬaaＷ=３８．８８５ ＬaiＷ=７９．４００ ＬaaＴ=２７．０８０ ＬaiＴ＝８２．４２３ （ＬaaＴ／ＬaiＴ）／（ＬaaＷ／ＬaiＷ）＝０．６７４ ｎｓ＝１．７６６８４ 次に、図７に本発明の実施例２の広角端における構成図
を示す。[Table 1] r D v n * 1) 542.0779 3.0000 45.37 1.796681 2) 21.5687 12.6000 1.000000 * 3) -218.5609 0.1700 56.34 1.495210 4) -125.0432 3.4000 49.45 1.772789 5) -173.0452 0.7000 1.000000 6) -100.0603 2.1500 33.89 1.803840 7) 46.5903 1.9000 1.000000 8) 46.3354 6.9000 25.35 1.805182 9) -275.3788 D9 (variable) 10) 40.8188 1.5000 35.19 1.749501 11) 20.3123 6.9000 61.09 1.589130 12) -121.1836 D12 (variable) 13) 71.9497 2.9000 48.04 1.716999 14) -362.0832 D14 (variable) ) Aperture 15) -47.0470 1.5000 52.30 1.748099 16) 31.3570 3.0000 23.82 1.846660 17) 138.3354 D17 (variable) 18) 35.3292 6.7000 82.52 1.497820 19) -73.2963 0.1000 1.000000 20) 70.8879 1.5000 25.35 1.805182 21) 21.3356 9.8000 82.52 1.497820 22) -47.4640 0.2000 1.000000 * 23) -111.7388 2.0000 46.80 1.766840 24) -144.8669 [aspheric coefficient table] (first surface) κ = 20.0 C3 = -0.95109 × 10 -5 C4 = 1.68200 × 10 -5 C5 = -0.32312 × 10 - 6 C6 = -6.37750 × 10 -9 C7 = 0.76231 × 10 -10 C8 = 6.38720 × 10 -12 C9 = 0.96455 × 10 - 13 C9 = -5.98570 × 10 -15 (3rd surface) κ = 99.0 C4 = -9.55040 × 10 -6 C6 = 2.774750 × 10 -8 C8 = -3.50950 × 10 -11 C10 = 4.888940 × 10 -14 (23rd Surface) κ = -10.0 C4 = -7.89980 × 10 -6 C6 = -1.48800 × 10 -8 C8 = 3.10340 × 10 -11 C10 = -9.56000 × 10 -14 [Variable interval table] f 17.50 24.00 34.00 F.NO 1 /2.9 1 / 2.9 1 / 2.9 d9 21.825 9.781 0.938 d12 5.475 5.475 5.475 d14 5.052 12.515 20.768 d18 12.785 7.735 0.980 Bf 38.515 43.726 53.343 [Values for conditional expressions] f1 = −28.267 f2 = 2125.207 | f1 / f2 | = 0.0133 n1 / n2 = 1.01 LaaW = 38.885 LaiW = 79.400 LaaT = 27.080 LaiT = 82.423 (LaaT / LaiT) / (LaaW / LaiW) = 0.675 ns = 1. 76684 Next, FIG. 7 shows a configuration diagram of the second embodiment of the present invention at the wide-angle end.
【００２１】実施例２は、物体側から順に、第１面にガ
ラスモールドによる非球面を有する負レンズと、ガラス
レンズの球面上に樹脂の薄層で非球面形状を形成した非
球面を有する負レンズと、正レンズとからなる第１レン
ズ群Ｇ１、負レンズと正レンズとの接合正レンズから成
る第２レンズ群前群Ｇ２Ｆ、正レンズから成る第２レン
ズ群後群Ｇ２Ｒ、負正の接合負レンズからなる第３レン
ズ群Ｇ３、正レンズと、負レンズと正レンズと像側に非
球面を有する負レンズとの３枚の接合で全体として正の
屈折力を有するレンズとからなる第４レンズ群とによっ
て構成される。変倍による群の移動や、合焦動作は実施
例１と同様である。In the second embodiment, in order from the object side, a negative lens having an aspheric surface formed of a glass mold on the first surface and a negative lens having an aspheric surface formed of a thin layer of resin on the spherical surface of the glass lens. A first lens group G1 composed of a lens and a positive lens, a junction of a negative lens and a positive lens, a second lens group front group G2F composed of a positive lens, a second lens group rear group G2R composed of a positive lens, and a negative-positive junction A fourth lens group including a third lens group G3 including a negative lens, a positive lens, and a lens having a positive refractive power as a whole by joining three negative lenses, a positive lens, and a negative lens having an aspheric surface on the image side. And a lens group. The movement of the group due to zooming and the focusing operation are the same as in the first embodiment.
【００２２】表２に、本発明の実施例２の諸元を示す。
各種表記は表１と同様である。Table 2 shows data of the second embodiment of the present invention.
Various notations are the same as in Table 1.
【００２３】[0023]
【表２】 r D ν ｎ *1) 825.0663 3.0000 45.37 1.796681 2) 19.9755 12.6000 1.000000 *3) -218.5609 0.1700 56.34 1.495210 4) -125.0432 3.4000 33.89 1.803840 5) 66.0888 0.7000 1.000000 6) 41.6976 6.9000 25.35 1.805182 7) 258.6978 D7（可変） 8) 89.7400 1.5000 35.19 1.749501 9) 33.0063 6.9000 61.09 1.589130 10) -49.5422 D10（可変） 11) 36.2860 2.9000 48.04 1.716999 12) 88.3174 D12（可変） 絞り 13) -40.4048 1.5000 52.30 1.748099 14) 34.7810 3.0000 23.82 1.846660 15) 258.6156 D15（可変） 16) 47.0773 6.0000 82.52 1.497820 17) -51.4180 0.1000 1.000000 18) 52.5014 1.5000 25.35 1.805182 19) 19.5816 9.0000 82.52 1.497820 20) -44.6196 2.0000 46.80 1.766840 *21) -61.6060 〔非球面係数表〕 （第１面）κ＝ 20.0 Ｃ3＝-0.95109×10-5 Ｃ4＝ 1.61551×10-5 Ｃ5＝-0.32312×10-6 Ｃ6＝-2.71993×10-9 Ｃ7＝ 0.76231×10-10 Ｃ8＝-1.89378×10-13 Ｃ9＝ 0.96455×10-13 Ｃ9＝-1.88953×10-15 （第３面）κ＝ 99.0 Ｃ4＝-8.20627×10-6 Ｃ6＝ 6.01217×10-9 Ｃ8＝ 2.97782×10-11 Ｃ10＝-2.40260×10-14 （第２１面）κ＝-10.0 Ｃ4＝-2.32222×10-6 Ｃ6＝ 2.89317×10-8 Ｃ8＝-1.39706×10-10 Ｃ10＝ 2.89576×10-13 〔可変間隔表〕 f 17.50 24.00 34.00 F.NO 1/3.0 1/3.3 1/4.0 D7 23.564 11.520 2.677 D10 9.497 9.497 9.497 D12 4.020 11.483 19.735 D15 12.722 7.672 0.917 Bf 39.616 44.827 54.444 〔条件式対応値〕 ｆ１=−２５．７３８ ｆ２=−５８．７９１ ｜ｆ１／ｆ２｜＝０．０４３８ ｎ１／ｎ２＝０．９９６ ＬaaＷ=３９．１２１９ ＬaiＷ=７８．７３８ ＬaaＴ=２７．３１７ ＬaiＴ=８１．７６１ （ＬaaＴ／ＬaiＴ）／（ＬaaＷ／ＬaiＷ）＝０．６７２ ｎｓ＝１．７６６８４ また、図３乃至図４に、本発明の実施例１の無限距離で
の広角端と望遠端の収差図を、図５乃至図６に、本発明
の実施例１の至近距離での広角端と望遠端の収差図を、
図８乃至図９に、本発明の実施例２の無限距離での広角
端と望遠端の収差図を、図１０乃至図１１に、本発明の
実施例２の至近距離での広角端と望遠端の収差図をそれ
ぞれ示す。各収差図中のｄ、ｇ、は、ｄ線及びｇ線（４
３６nm）における収差であることを示し、非点収差図中
の点線は、メリディオナル像面を、実線はサジタル像面
を示す。また、歪曲収差図は、ｄ線の歪曲収差を示す。(Table 2) r D v n * 1) 825.0663 3.0000 45.37 1.796681 2) 19.9755 12.6000 1.000000 * 3) -218.5609 0.1700 56.34 1.495210 4) -125.0432 3.4000 33.89 1.803840 5) 66.0888 0.7000 1.000000 6) 41.6976 6.9000 25.35 1.805182 7) 258.6978 D7 (Variable) 8) 89.7400 1.5000 35.19 1.749501 9) 33.0063 6.9000 61.09 1.589130 10) -49.5422 D10 (variable) 11) 36.2860 2.9000 48.04 1.716999 12) 88.3174 D12 (variable) Aperture 13) -40.4048 1.5000 52.30 1.748099 14) 34.7810 3.0000 23.82 1.846660 15) 258.6156 D15 (variable) 16) 47.0773 6.0000 82.52 1.497820 17) -51.4180 0.1000 1.000000 18) 52.5014 1.5000 25.35 1.805182 19) 19.5816 9.0000 82.52 1.497820 20) -44.6196 2.0000 46.80 1.766840 * 21) -61.6060 [Aspheric surface coefficient] ( Surface 1) κ = 20.0 C3 = -0.95109 × 10 -5 C4 = 1.61551 × 10 -5 C5 = -0.32312 × 10 -6 C6 = -2.71993 × 10 -9 C7 = 0.76231 × 10 -10 C8 = -1.89378 × 10 -13 C9 = 0.96455 × 10 -13 C9 = -1.88953 × 10 -15 ( third surface) κ = 99.0 C4 = -8.20627 × 10 -6 C6 = 6.01217 × 10 -9 8 = 2.97782 × 10 -11 C10 = -2.40260 × 10 -14 ( 21 surface) κ = -10.0 C4 = -2.32222 × 10 -6 C6 = 2.89317 × 10 -8 C8 = -1.39706 × 10 -10 C10 = 2.89576 × 10 -13 [Variable interval table] f 17.50 24.00 34.00 F.NO 1 / 3.0 1 / 3.3 1 / 4.0 D7 23.564 11.520 2.677 D10 9.497 9.497 9.497 D12 4.020 11.483 19.735 D15 12.722 7.672 0.917 Bf 39.616 44.827 54.444 [Values for conditional expressions] F1 = −25.738 f2 = −58.791 | f1 / f2 | = 0.0438 n1 / n2 = 0.996 LaaW = 39.1219 LaiW = 78.738 LaaT = 27.317 LaiT = 81.761 ( LaaT / LaiT) / (LaaW / LaiW) = 0.672 ns = 1.76684 FIGS. 3 and 4 are aberration diagrams at the wide-angle end and the telephoto end at infinity according to the first embodiment of the present invention. 5 to 6 show aberration diagrams of the first embodiment of the present invention at a close distance at a wide angle end and a telephoto end, respectively.
8 and 9 show aberration diagrams at the wide-angle end and the telephoto end at infinity according to the second embodiment of the present invention. FIGS. 10 and 11 show the wide-angle end and the telephoto end at the closest distance according to the second embodiment of the present invention. The aberration diagrams at the edges are respectively shown. D and g in each aberration diagram are d-line and g-line (4
36 nm), the dotted line in the astigmatism diagram indicates the meridional image plane, and the solid line indicates the sagittal image plane. Further, the distortion diagram shows the distortion at the d-line.
【００２４】これらの収差図によれば、各実施例とも、
広角端から望遠端まで、また無限遠から至近距離にいた
るまで、各収差が良好に補正されていることがわかる。According to these aberration diagrams, in each embodiment,
It can be seen that each aberration is satisfactorily corrected from the wide-angle end to the telephoto end, and from infinity to a close distance.
【００２５】[0025]
【発明の効果】以上説明したように、本発明によれば、
第１レンズ群中の最適な位置に、最適な形状の非球面を
配置することにより、広角端から望遠端まで、良好な性
能を有するズームレンズを提供することができる。As described above, according to the present invention,
By disposing an aspherical surface having an optimal shape at an optimal position in the first lens group, it is possible to provide a zoom lens having good performance from the wide-angle end to the telephoto end.
【図１】条件式（３）に関する、実施例１の開口絞りか
ら像面までの拡大図FIG. 1 is an enlarged view of a conditional expression (3) from an aperture stop to an image plane according to a first embodiment.
【図２】実施例１の広角端におけるレンズ構成図。FIG. 2 is a lens configuration diagram of a first embodiment at a wide-angle end.
【図３】実施例１の無限遠の広角端における収差図。FIG. 3 is an aberration diagram at a wide angle end at infinity according to the first exemplary embodiment.
【図４】実施例１の無限遠の望遠端における収差図。FIG. 4 is an aberration diagram at a telephoto end at infinity according to the first embodiment.
【図５】実施例１の至近距離の広角端における収差図。FIG. 5 is an aberration diagram at a short-distance wide-angle end according to the first embodiment.
【図６】実施例１の至近距離の望遠端における収差図。FIG. 6 is an aberration diagram at a telephoto end at a close distance according to the first exemplary embodiment.
【図７】実施例２の広角端におけるレンズ構成図。FIG. 7 is a lens configuration diagram at a wide-angle end according to a second embodiment.
【図８】実施例２の無限遠の広角端における収差図。FIG. 8 is an aberration diagram at a wide-angle end at infinity in Example 2.
【図９】実施例２の無限遠の望遠端における収差図。FIG. 9 is an aberration diagram at a telephoto end at infinity according to a second embodiment.
【図１０】実施例２の至近距離の広角端における収差
図。FIG. 10 is an aberration diagram at a short-distance wide-angle end according to the second embodiment.
【図１１】実施例２の至近距離の望遠端における収差
図。FIG. 11 is an aberration diagram at a telephoto end at a close distance according to the second embodiment.
Ｇ１ 第１レンズ群 Ｇ２ 第２レンズ群 Ｇ２Ｆ 第２レンズ群前群 Ｇ２Ｒ 第２レンズ群後群 Ｇ３ 第３レンズ群 Ｇ４ 第４レンズ群 Ｓ 開口絞り G1 first lens group G2 second lens group G2F second lens group front group G2R second lens group rear group G3 third lens group G4 fourth lens group S aperture stop
Claims (6)
レンズ群と、正の屈折力を有する第２レンズ群と、負の
屈折力を有する第３レンズ群と、正の屈折力を有する第
４レンズ群を備えたズームレンズにおいて、前記第１レ
ンズ群は少なくとも２つの非球面を有し、以下の条件式
を満足することを特徴とするズームレンズ。 １．０ ＞｜ｆ１／ｆ２｜ ＞ ０．０ ただし、 ｆ１：前記第１レンズ群中の、非球面を有するレンズの
うち、最も物体側に位置するレンズＬ１の焦点距離 ｆ２：前記第１レンズ群中の、非球面を有するレンズの
うち、物体側から２番目に位置するレンズＬ２の焦点距
離1. A first lens having a negative refractive power in order from the object side.
A first lens group in a zoom lens including a lens group, 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. Is a zoom lens having at least two aspheric surfaces and satisfying the following conditional expression. 1.0> | f1 / f2 |> 0.0 where f1: the focal length of the lens L1 located closest to the object side among the aspherical lenses in the first lens group f2: the first lens Focal length of lens L2 located second from the object side among lenses having an aspheric surface in the group
（２）を満足することを特徴とする、請求項１に記載の
ズームレンズ。 ０．９＜ ｎ１／ｎ２ ＜１．１ ｎ１：前記レンズＬ１を構成するガラスの、ｄ線（588n
m）における屈折率 ｎ２：前記レンズＬ２を構成するガラスの、ｄ線（588n
m）における屈折率2. The zoom lens according to claim 1, wherein said lenses L1 and L2 satisfy the following conditional expression (2). 0.9 <n1 / n2 <1.1 n1: d line (588n) of the glass constituting the lens L1
n2: d-line (588n) of the glass constituting the lens L2.
m) refractive index
て構成され、前記第２レンズ群前群を動かすことにより
合焦を行うことを特徴とする、請求項１に記載のズーム
レンズ。3. The zoom according to claim 1, wherein the second lens group includes a front group and a rear group, and focuses by moving the front group of the second lens group. lens.
の接合正レンズを有することを特徴とする、請求項３に
記載のズームレンズ。4. The zoom lens according to claim 3, wherein the front group of the second lens group has at least one cemented positive lens.
レンズ群と、正の屈折力を有する第２レンズ群と、負の
屈折力を有する第３レンズ群と、正の屈折力を有する第
４ンズ群とを備え、前記第２レンズ群と前記第３レンズ
群との間、あるいは前記第３レンズ群中に開口絞りを有
するズームレンズにおいて、前記第４レンズ群は少なく
とも１つの非球面を有し、前記第４レンズ群中の非球面
は以下の条件式を満足することを特徴とするズームレン
ズ。 ０．４ ＜ （ＬaaＴ／ＬaiＴ）／（ＬaaＷ／ＬaiＷ）
≦ １．０ １．６５ ＜ ｎｓ ただし、 ＬaiＷ：広角端における前記開口絞りから像面までの距
離 ＬaiＴ：望遠端における前記開口絞りから像面までの距
離 Ｌaaｗ：広角端における前記開口絞りから前記第４レン
ズ群中の非球面までの光軸上の距離 Ｌaaｔ：望遠端における前記開口絞りから前記第４レン
ズ群中の非球面までの光軸上の距離 ｎｓ：前記第４レンズ群中の非球面を有するレンズを構
成するガラスの、ｄ線（588nm）における屈折率5. A first lens having a negative refractive power in order from the object side.
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. In a zoom lens having an aperture stop between three lens groups or in the third lens group, the fourth lens group has at least one aspheric surface, and the aspheric surface in the fourth lens group is A zoom lens characterized by satisfying conditional expressions. 0.4 <(LaaT / LaiT) / (LaaW / LaiW)
≤ 1.0 1.65 <ns where LaiW: distance from the aperture stop to the image plane at the wide-angle end LaiT: distance from the aperture stop to the image plane at the telephoto end Laaw: the distance from the aperture stop at the wide-angle end Distance on the optical axis to the aspheric surface in the four lens units Laat: Distance on the optical axis from the aperture stop at the telephoto end to the aspheric surface in the fourth lens unit ns: Aspheric surface in the fourth lens group Index of d-line (588nm) of the glass constituting the lens having
合正レンズを有することを特徴とする、請求項５に記載
のズームレンズ。6. The zoom lens according to claim 5, wherein said fourth lens group has at least one cemented positive lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26287099A JP4449114B2 (en) | 1999-09-17 | 1999-09-17 | Zoom lens |
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| JP26287099A JP4449114B2 (en) | 1999-09-17 | 1999-09-17 | Zoom lens |
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| JP2001083421A true JP2001083421A (en) | 2001-03-30 |
| JP4449114B2 JP4449114B2 (en) | 2010-04-14 |
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| JP26287099A Expired - Lifetime JP4449114B2 (en) | 1999-09-17 | 1999-09-17 | Zoom lens |
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