JP3140111B2 - 高倍率顕微鏡対物レンズ - Google Patents

高倍率顕微鏡対物レンズ

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JP3140111B2
JP3140111B2 JP03303407A JP30340791A JP3140111B2 JP 3140111 B2 JP3140111 B2 JP 3140111B2 JP 03303407 A JP03303407 A JP 03303407A JP 30340791 A JP30340791 A JP 30340791A JP 3140111 B2 JP3140111 B2 JP 3140111B2
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JPH05142477A (ja
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斎藤良治
横谷麻子
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Olympus Corp
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Olympus Optic Co Ltd
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【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、像面が平坦で２次スペ
クトルがよく除去されたセミアポクロマート、アポクロ
マート設計で、かつ、近年、研究分野で盛んに使用され
ている紫外線励起蛍光（励起光波長：３６５ｎｍ）まで
高性能を発揮する高開口数、高倍率顕微鏡対物レンズに
関するものである。
【０００２】
【従来の技術】従来より、高開口数、高倍率で２次スペ
クトルがよく除去された顕微鏡対物レンズは提案されて
いる。例えば、特開昭６１−２７５８１３号のものは、
像面の平坦性はやや劣るけれども、２次スペクトルは非
常によく補正されている。しかし、レンズ枚数が多いこ
とや、後述するが、蛍光用の対物レンズとして高性能を
発揮できない問題点がある。
【０００３】蛍光用の対物レンズの場合、特に蛍光用硝
材を用いなければならないために、特開昭６１−２７５
８１３号や特開昭５９−１５５８２２号のもので用いる
ハイパークロマティック（接合レンズの屈折率が凸と凹
でほぼ同一で、アッベ数が異なるようにしたもの）によ
る色収差補正は難しくなる。
【０００４】また、特開昭５１−１３５５４５号、特開
昭５８−１９２０１３号のものは、比較的色収差、像面
湾曲が補正されているが、レンズ構成が簡単なために、
十分に諸収差が補正されていない。さらに、蛍光用の対
物レンズとして高性能を発揮することができない。
【０００５】
【発明が解決しようとする課題】近年、特に生物関係の
研究市場では、ある特定の物質を蛍光染色することによ
って細胞にダメージを与えることなく観察できることか
ら、蛍光顕微鏡が広く使用されてきている。蛍光顕微鏡
は、短い波長の光を標本に当て（励起）、その蛍光を観
察するものであり、励起波長の短いものの代表的な光に
ｉ線（３６５ｎｍ）があり、また、最近、生体内のカル
シウムイオンを観察するために、３４０ｎｍの励起光も
用いられている。
【０００６】したがって、蛍光用顕微鏡対物レンズで
は、３４０ｎｍ程度までの波長の透過率が２０％以上あ
ることが必要である。さらに、発光する蛍光は微弱なも
のが多いため、対物レンズを構成している硝材に励起光
によって蛍光を発する（自家蛍光）ものがあると、観察
像のコントラストを著しく劣化させる。このために、蛍
光用対物レンズでは、使用できる硝材にかなりの制限が
加わる。例えば、アッベ数が３５以下の硝材や、アッベ
数が５０以下で屈折率が１．６２以上の硝材は、使用で
きない。また、それ以外の範囲の硝材でも、使用できる
ものは限られている。
【０００７】上記した従来技術の特開昭５９−１５５８
２２号、特開昭６１−２７５８１３号のものでは、蛍光
用硝材を用いた設計でないということと、ハイパークロ
マティックの構成で色収差をとっているため、凸レンズ
の分散が比較的大きいので、蛍光用硝材を用いては、色
収差補正を十分にできない。
【０００８】また、特開昭５１−１３５５４５号、特開
昭５８−１９２０１３号、特開昭４９−１０７５３号の
ものは、ハイパークロマティックの構成をとらずに、凸
レンズに分散の小さい硝材を使用しているが、蛍光用硝
材を用いて、色収差、像面湾曲等の諸収差の補正を行う
には、不十分なレンズ構成である。
【０００９】本発明はこのような状況に鑑みてなされた
ものであり、その目的は、蛍光用硝材を用いて、球面収
差、色収差、像面湾曲等を良好に補正できる構成にした
高倍率、高開口数のセミアポクロマート又はアポクロマ
ート顕微鏡対物レンズを提供することである。
【００１０】
【課題を解決するための手段】上記目的を達成する本発
明の高倍率顕微鏡対物レンズは、物体側から順に、平凸
レンズ又は像側に強い凸面を向けた接合面を持つ平凸レ
ンズの第１レンズ群Ｇ１、正屈折力の第２レンズ群Ｇ
２、凸レンズと凹レンズと凸レンズの３枚接合レンズと
負屈折力の接合面を持つ接合レンズを含む第３レンズ群
Ｇ３、像側に凹面を向けた接合メニスカスレンズとこの
接合メニスカスレンズに対向して物体側に凹面を向けた
接合メニスカスレンズを含む、前記第３レンズ群Ｇ３か
ら射出された光束を平行光束として射出する第４レンズ
群Ｇ４から構成され、以下の条件を満足することを特徴
とするものである。 （１） （ｎ3N−ｎ3P）｜Ｈ3 ｜／｜ｒ3PN ｜＞０．０４ （２） （ｎIIIN−ｎIIIP）｜ＨIII ｜／｜ｒIIIPN ｜＞０．１５ （３） ν3P＞７０ ただし、ｎ3Nは第３レンズ群の凸凹凸３枚接合レンズの
凹レンズの屈折率、ｎ3P、ν3Pはそれぞれ第３レンズ群
の凸凹凸３枚接合レンズの物体側凸レンズの屈折率及び
アッベ数、ｒ3PN は第３レンズ群の凸凹凸３枚接合レン
ズの物体側接合面の曲率半径、Ｈ3 は第３レンズ群の凸
凹凸３枚接合レンズの物体側接合面での最大開口数の光
線が通る光線高、ｎIIIN、ｎIIIP、ｒIIIP、ＨIII はそ
れぞれ第３レンズ群中の前記凸凹凸３枚接合レンズ以外
の少なくとも１面の接合面前後での凹レンズの屈折率、
凸レンズの屈折率、その接合面の曲率半径、及び、その
接合面での最大開口数の光線が通る光線高である。この
場合、下記の条件（４）、（５）を満足することが望ま
しい。 （４） ３５＜νIVP ＜４５ （５） ５０＞νIVN ただし、νIVP 、νIVN はそれぞれ第４レンズ群Ｇ４の
物体側に凹面を向けた接合メニスカスレンズの凸レンズ
のアッベ数及び凹レンズのアッベ数である。
【００１１】
【作用】以下、上記構成を採用した理由と作用について
説明する。本発明の高倍率顕微鏡対物レンズは、上記し
たように、物体側から順に、平凸レンズ又は像側に強い
凸面を向けた接合面を持つ平凸レンズの第１レンズ群Ｇ
１、正屈折力の第２レンズ群Ｇ２、凸レンズと凹レンズ
と凸レンズの３枚接合レンズと負屈折力の接合面を持つ
接合レンズを含む第３レンズ群Ｇ３、像側に凹面を向け
た接合メニスカスレンズとこの接合メニスカスレンズに
対向して物体側に凹面を向けた接合メニスカスレンズを
含む、第３レンズ群Ｇ３から射出された光束を平行光束
として射出する第４レンズ群Ｇ４から構成されているこ
とを特徴としている。
【００１２】本発明の顕微鏡対物レンズにおいて、第１
群Ｇ１は平凸レンズであり、平凸レンズの硝材は、油浸
液、カバーガラスとほぼ同一の屈折率を持っていること
と、凸面の曲率は不遊条件を満足していることから、基
準波長の球面収差はほとんど発生しない。この平凸レン
ズが、像側に強い凸面を向けた負の屈折力を持つ接合面
を有することによって、ペッツバール和を正とすること
ができ、対物レンズ全系としての像面湾曲を小さくする
ことができる。
【００１３】第２群Ｇ２は正屈折力を持ち、光線の発散
を小さくして第３群Ｇ３へ導く。
【００１４】第３群Ｇ３は、球面収差、色収差の補正を
する。瞳位置に近い３枚接合レンズによって色収差の補
正を行う。下記の条件によって、諸収差が良好に補正さ
れる。
【００１５】（１） （ｎ3N−ｎ3P）｜Ｈ3 ｜／｜ｒ
3PN ｜＞０．０４ （２） （ｎIIIN−ｎIIIP）｜ＨIII ｜／｜ｒIIIPN ｜
＞０．１５ （３） ν3P＞７０ ただし、ｎ3Nは第３群Ｇ３の凸凹凸３枚接合レンズの凹
レンズの屈折率、ｎ3P、ν3Pはそれぞれ第３群Ｇ３の凸
凹凸３枚接合レンズの物体側凸レンズの屈折率及びアッ
ベ数、ｒ3PN は第３群Ｇ３の凸凹凸３枚接合レンズの物
体側接合面の曲率半径、Ｈ3 は第３群Ｇ３の凸凹凸３枚
接合レンズの物体側接合面での最大開口数の光線が通る
光線高、ｎIIIN、ｎIIIP、ｒIIIP、ＨIIIはそれぞれ第
３群Ｇ３中の前記凸凹凸３枚接合レンズ以外の少なくと
も１面の接合面前後での凹レンズの屈折率、凸レンズの
屈折率、その接合面の曲率半径、及び、その接合面での
最大開口数の光線が通る光線高である。
【００１６】上記（１）、（２）の条件は、第１群Ｇ
１、第２群Ｇ２で発生した球面収差、色収差を補正する
条件で、全体に蛍光用硝材を用いているために、特に凸
レンズは屈折率の低い硝材を使用することになり、各レ
ンズ面での正の屈折力が強くなり、また、収差の発生も
多くなる。これを補正するために、第３群Ｇ３の接合面
で比較的強い負の屈折力を必要とする。（１）、（２）
の条件の下限を越えると、正屈折力の面で発生する球面
収差、色収差が補正不足となってしまう。
【００１７】また、（３）の条件は、特に軸上色収差を
補正するのに必要な条件で、蛍光用対物レンズのため
に、アッベ数３５以下の硝材又はアッベ数５０以下でか
つ屈折率１．６２以上の硝材が使用できない。したがっ
て、凹レンズに使用する硝材のアッベ数を小さくでき
ず、色収差を補正するためには、凸レンズのアッベ数を
大きくする必要がある。第３群Ｇ３の物体側の凸レンズ
は、対物レンズの瞳位置に近く、軸上色収差に最も効い
ているために、（３）の条件を満たす必要があり、
（３）の条件の下限を越えると、色収差が補正不足とな
ってしまう。
【００１８】第４群Ｇ４は、特に倍率色収差、像面湾
曲、コマ収差を補正している。本発明の対物レンズは蛍
光用対物レンズであるから、屈折率の高い硝材を使えな
い。そのため、２つの接合メニスカスレンズの凹面を向
かい合わせる構成をとり、凹面での光線高を下げて、曲
率を小さくし、ペッツバール和を正としている。
【００１９】第４群Ｇ４の物体側に凹面を向けた接合メ
ニスカスレンズの硝材の組み合わせを、蛍光対物レンズ
の場合、以下のようにすることによって、倍率色収差は
さらに補正される。
【００２０】（４） ３５＜νIVP ＜４５ （５） ５０＞νIVN ただし、νIVP 、νIVN はそれぞれ第４群Ｇ４の物体側
に凹面を向けた接合メニスカスレンズの凸レンズのアッ
ベ数及び凹レンズのアッベ数である。
【００２１】（４）の上限、（５）の下限を越えると、
倍率色収差が補正不足となり、また、（４）の下限を越
えると、蛍光用硝材がなくなるので、蛍光用対物レンズ
としての性能が劣化してしまう。
【００２２】さらに、以下の条件を加えることによっ
て、さらに良好に諸収差を補正することができる。
【００２３】第２群Ｇ２は正の屈折力を持つが、色収差
の発生を小さくするため、分散の小さい異常分散ガラス
を用いることが望ましい。また、本発明の顕微鏡対物レ
ンズでは、第２群Ｇ２を正レンズ１枚で構成することが
できる。１枚で構成する場合、レンズ面での正の屈折力
が強くなるため、第３群Ｇ３以降に負の屈折力を持った
面がさらに必要となる。第２群Ｇ２が正の単レンズから
なる場合、第３群Ｇ３レンズ中の条件（１）、（２）以
外の接合面で、以下の条件を満たす面を少なくとも１面
設けることが望ましい。
【００２４】 （６） （ｎ3GN −ｎ3GP ）Ｈ3G／ｒ3G＞０．０７ ここで、ｎ3GN 、ｎ3GP 、ｒ3G、Ｈ3Gは、それぞれ条件
（１）、（２）以外の第３群Ｇ３中の少なくとも１面の
接合面前後での凹レンズの屈折率、凸レンズの屈折率、
その接合面の曲率半径、及び、その接合面での最大開口
数の光線が通る光線高である。本条件の下限を越える
と、第２群Ｇ２で発生した球面収差、色収差の補正不足
量が多くなる。
【００２５】
【実施例】次に、本発明の高倍率顕微鏡対物レンズの実
施例１〜４について説明する。各実施例のレンズデータ
は後記するが、実施例１〜４のレンズ構成を示す断面図
をそれぞれ図１〜図４に示す。
【００２６】各群の構成については、第１群Ｇ１は、実
施例１は平凸レンズ１枚からなり、実施例２〜３は平凸
レンズと負メニスカスレンズの接合レンズからなる平凸
レンズからなる。第２群Ｇ２は、実施例１、３は物体側
に凹面を向けた正メニスカスレンズからなり、実施例２
は両凸レンズからなり、また、実施例４は物体側に凹面
を向けた正メニスカスレンズと両凸レンズ２枚からな
る。第３群３は、実施例１、２は、両凸レンズ、両凹レ
ンズ、両凸レンズの３枚接合レンズと、両凸レンズと負
メニスカスレンズの接合レンズとからなり、実施例３、
４は、両凸レンズ、両凹レンズ、両凸レンズの３枚接合
レンズと、負メニスカスレンズ、両凸レンズ、負メニス
カスレンズの３枚接合レンズとからなる。第４群Ｇ４
は、何れの実施例も、両凸レンズと両凹レンズの接合メ
ニスカスレンズと、両凹レンズと両凸レンズの接合メニ
スカスレンズとからなる。
【００２７】以下に各実施例のレンズデータを示すが、
記号は、ｒ1 、ｒ2 …は物体側から順に示した各レンズ
面の曲率半径、ｄ1 、ｄ2 …は物体側から順に示した各
レンズ面間の間隔、ｎd1、ｎd2…は物体側から順に示し
た各レンズのｄ線の屈折率、νd1、νd2…は物体側から
順に示した各レンズのアッベ数である。
【００２８】各実施例ともに、焦点距離ｆ＝１．８ｍ
ｍ、倍率β＝１００×、開口数ＮＡは、実施例１、２が
１．３、実施例３、４が１．３５である。なお、何れも
油浸系であり、カバーガラス厚さは０．１７ｍｍ、その
屈折率、アッベ数はそれぞれｎd ＝１．５２１、νd ＝
５６．０２であり、使用するオイルの屈折率とアッベ数
はそれぞれｎd ＝１．５１５４８、νd ＝４３．１とし
て設計してある。
【００２９】実施例１ ｒ1 = ∞ ｄ1 = 3.2039 ｎd1 =1.51633 νd1 =64.15 ｒ2 = -2.2182 ｄ2 = 0.1200 ｒ3 = -28.5740 ｄ3 = 3.3718 ｎd2 =1.56907 νd2 =71.30 ｒ4 = -5.6832 ｄ4 = 0.1800 ｒ5 = 9.1739 ｄ5 = 7.6264 ｎd3 =1.43389 νd3 =95.15 ｒ6 = -7.6030 ｄ6 = 1.5800 ｎd4 =1.61340 νd4 =43.84 ｒ7 = 8.2087 ｄ7 = 4.8000 ｎd5 =1.43389 νd5 =95.15 ｒ8 = -10.2274 ｄ8 = 2.6045 ｒ9 = 19.7320 ｄ9 = 3.8000 ｎd6 =1.43389 νd6 =95.15 ｒ10= -6.6286 ｄ10= 1.4000 ｎd7 =1.78650 νd7 =50.00 ｒ11= -20.6157 ｄ11= 0.1500 ｒ12= 6.5086 ｄ12= 3.3200 ｎd8 =1.56907 νd8 =71.30 ｒ13= -15.2083 ｄ13= 8.9523 ｎd9 =1.69680 νd9 =56.49 ｒ14= 2.3896 ｄ14= 1.4800 ｒ15= -2.9839 ｄ15= 2.2805 ｎd10=1.69680 νd10=56.49 ｒ16= 20.1507 ｄ16= 3.3886 ｎd11=1.59551 νd11=39.21 r17= -4.9409 。
【００３０】実施例２ ｒ1 = ∞ ｄ1 = 0.3500 ｎd1 =1.51633 νd1 =64.15 ｒ2 = -0.9000 ｄ2 = 2.8416 ｎd2 =1.74100 νd2 =52.68 ｒ3 = -2.3456 ｄ3 = 0.1200 ｒ4 = 15.1515 ｄ4 = 4.1915 ｎd3 =1.56907 νd3 =71.30 ｒ5 = -8.9429 ｄ5 = 0.1800 ｒ6 = 8.2306 ｄ6 = 4.6318 ｎd4 =1.43389 νd4 =95.15 ｒ7 = -7.2761 ｄ7 = 1.5800 ｎd5 =1.61340 νd5 =43.84 ｒ8 = 5.9360 ｄ8 = 4.8000 ｎd6 =1.43389 νd6 =95.15 ｒ9 = -10.2030 ｄ9 = 2.7391 ｒ10= 21.9862 ｄ10= 3.8000 ｎd7 =1.43389 νd7 =95.15 ｒ11= -5.0817 ｄ11= 1.4000 ｎd8 =1.78650 νd8 =50.00 ｒ12= -18.0917 ｄ12= 0.1500 ｒ13= 6.3636 ｄ13= 3.3200 ｎd9 =1.56907 νd9 =71.30 ｒ14= -16.3304 ｄ14= 8.5742 ｎd10=1.67790 νd10=55.33 ｒ15= 2.9640 ｄ15= 1.4800 ｒ16= -3.5537 ｄ16= 3.3672 ｎd11=1.74100 νd11=52.68 ｒ17= 9.6890 ｄ17= 4.2315 ｎd12=1.59551 νd12=39.21 ｒ18= -5.8215 。
【００３１】実施例３ ｒ1 = ∞ ｄ1 = 0.3900 ｎd1 =1.51633 νd1 =64.15 ｒ2 = -1.1107 ｄ2 = 2.4969 ｎd2 =1.75500 νd2 =52.33 ｒ3 = -2.2119 ｄ3 = 0.1300 ｒ4 = -28.9504 ｄ4 = 3.1687 ｎd3 =1.49700 νd3 =81.61 ｒ5 = -5.3025 ｄ5 = 0.1700 ｒ6 = 7.3775 ｄ6 = 4.3329 ｎd4 =1.43389 νd4 =95.15 r7 = -28.7652 ｄ7 = 1.2000 ｎd5 =1.78650 νd5 =50.00 ｒ8 = 5.9676 ｄ8 = 7.1251 ｎd6 =1.43389 νd6 =95.15 ｒ9 = -8.0756 ｄ9 = 1.0000 ｒ10= 12.0675 ｄ10= 1.1000 ｎd7 =1.78650 νd7 =50.00 ｒ11= 6.4347 ｄ11= 4.8006 ｎd8 =1.43389 νd8 =95.15 ｒ12= -8.4507 ｄ12= 1.0000 ｎd9 =1.61340 νd9 =43.84 ｒ13= -23.2627 ｄ13= 0.2300 ｒ14= 5.5850 ｄ14= 4.6000 ｎd10=1.45600 νd10=90.31 ｒ15= -15.1371 ｄ15= 6.2321 ｎd11=1.67790 νd11=55.33 ｒ16= 2.5373 ｄ16= 2.0000 ｒ17= -3.1322 ｄ17= 2.9411 ｎd12=1.74100 νd12=52.68 ｒ18= 23.3701 ｄ18= 3.0000 ｎd13=1.61293 νd13=37.00 ｒ19= -5.1211 。
【００３２】実施例４ ｒ1 = ∞ ｄ1 = 0.3900 ｎd1 =1.51633 νd1 =64.15 ｒ2 = -1.2000 ｄ2 = 2.4412 ｎd2 =1.75500 νd2 =52.33 ｒ3 = -2.4965 ｄ3 = 0.1300 ｒ4 = -6.0998 ｄ4 = 2.3000 ｎd3 =1.48749 νd3 =70.20 ｒ5 = -3.8953 ｄ5 = 0.1000 ｒ6 = 23.4492 ｄ6 = 3.0000 ｎd4 =1.43389 νd4 =95.15 ｒ7 = -9.0406 ｄ7 = 0.1700 ｒ8 = 11.7642 ｄ8 = 6.7864 ｎd5 =1.43389 νd5 =95.15 ｒ9 = -5.8951 ｄ9 = 1.0000 ｎd6 =1.78650 νd6 =50.00 ｒ10= 74.3151 ｄ10= 4.0000 ｎd7 =1.49700 νd7 =81.61 ｒ11= -7.7673 ｄ11= 0.1000 ｒ12= 27.3570 ｄ12= 1.0000 ｎd8 =1.78650 νd8 =50.00 ｒ13= 6.1179 ｄ13= 5.0000 ｎd9 =1.43389 νd9 =95.15 ｒ14= -6.3330 ｄ14= 1.0000 ｎd10=1.61340 νd10=43.84 r15= -11.2308 ｄ15= 0.2300 ｒ16= 6.9394 ｄ16= 3.5000 ｎd11=1.49700 νd11=81.61 ｒ17= -12.5880 ｄ17= 7.7169 ｎd12=1.67790 νd12=55.33 ｒ18= 3.3598 ｄ18= 2.0000 ｒ19= -2.7074 ｄ19= 3.0122 ｎd13=1.74100 νd13=52.68 ｒ20= 16.8593 ｄ20= 2.8000 ｎd14=1.61293 νd14=37.00 ｒ21= -4.9106 。
【００３３】上記各実施例の対物レンズは、例えば以下
に示すレンズデータを有し、図５にレンズ断面を示す結
像レンズと組み合わせて用いられる。ただし、データ
中、ｒ1'、ｒ2'…は物体側から順に示した各レンズ面の
曲率半径、ｄ1'、ｄ2'…は物体側から順に示した各レン
ズ面間の間隔、ｎd1' 、ｎd2' …は物体側から順に示し
た各レンズのｄ線の屈折率、νd1' 、νd2' …は物体側
から順に示した各レンズのアッベ数である。
【００３４】 ｒ1'= 68.7541 ｄ1'= 7.7321 ｎd1'=1.48749 νd1'=70.20 ｒ2'= -37.5679 ｄ2'= 3.4742 ｎd2'=1.80610 νd2'=40.95 ｒ3'= -102.8477 ｄ3'= 0.6973 ｒ4'= 84.3099 ｄ4'= 6.0238 ｎd3'=1.83400 νd3'=37.16 ｒ5'= -50.7100 ｄ5'= 3.0298 ｎd4'=1.64450 νd4'=40.82 ｒ6'= 40.6619 。
【００３５】この場合、実施例１〜４の対物レンズと図
５の結像レンズの間の間隔は５０ｍｍ〜１７０ｍｍの間
の何れの位置でもよいが、この間隔を１００ｍｍとした
場合についの実施例１〜４の球面収差、非点収差、ＯＳ
Ｃ’（倍率色収差を表すコンラディのＯＳＣ’）、コマ
収差を表す収差図をそれぞれ図６〜図９に示す（非点収
差は像高１３．２５まで、コマ収差は像高９．２７５の
値を示す。）。なお、上記間隔が５０ｍｍ〜１７０ｍｍ
の間で１００ｍｍ以外の位置においてもほぼ同様の収差
状況を示す。
【００３６】また、各実施例の前記した条件（１）〜
（６）の値を次の表に示す。
【００３７】
【発明の効果】以上の説明から明らかなように、本発明
によると、蛍光用硝材を用いても、球面収差、色収差、
像面湾曲等の諸収差が良好に補正され、高倍率、高開口
数のセミアポクロマート又はアポクロマートの顕微鏡対
物レンズを提供することができる。
【図面の簡単な説明】
【図１】本発明の実施例１の高倍率顕微鏡対物レンズの
レンズ断面図である。
【図２】実施例２のレンズ断面図である。
【図３】実施例３のレンズ断面図である。
【図４】実施例４のレンズ断面図である。
【図５】各実施例の顕微鏡対物レンズと共に用いる結像
レンズのレンズ断面図である。
【図６】実施例１の球面収差、非点収差、ＯＳＣ’、コ
マ収差を表す収差図である。
【図７】実施例２の図６と同様な収差図である。
【図８】実施例３の図６と同様な収差図である。
【図９】実施例４の図６と同様な収差図である。
【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
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04

Claims (2)

    (57)【特許請求の範囲】
  1. 【請求項１】 物体側から順に、平凸レンズ又は像側に
    強い凸面を向けた接合面を持つ平凸レンズの第１レンズ
    群Ｇ１、正屈折力の第２レンズ群Ｇ２、凸レンズと凹レ
    ンズと凸レンズの３枚接合レンズと負屈折力の接合面を
    持つ接合レンズを含む第３レンズ群Ｇ３、像側に凹面を
    向けた接合メニスカスレンズとこの接合メニスカスレン
    ズに対向して物体側に凹面を向けた接合メニスカスレン
    ズを含む、前記第３レンズ群Ｇ３から射出された光束を
    平行光束として射出する第４レンズ群Ｇ４から構成さ
    れ、以下の条件を満足することを特徴とする高倍率顕微
    鏡対物レンズ： （１） （ｎ3N−ｎ3P）｜Ｈ3 ｜／｜ｒ3PN ｜＞０．０４ （２） （ｎIIIN−ｎIIIP）｜ＨIII ｜／｜ｒIIIPN ｜＞０．１５ （３） ν3P＞７０ ただし、ｎ3Nは第３レンズ群の凸凹凸３枚接合レンズの
    凹レンズの屈折率、ｎ3P、ν3Pはそれぞれ第３レンズ群
    の凸凹凸３枚接合レンズの物体側凸レンズの屈折率及び
    アッベ数、ｒ3PN は第３レンズ群の凸凹凸３枚接合レン
    ズの物体側接合面の曲率半径、Ｈ3 は第３レンズ群の凸
    凹凸３枚接合レンズの物体側接合面での最大開口数の光
    線が通る光線高、ｎIIIN、ｎIIIP、ｒIIIP、ＨIII はそ
    れぞれ第３レンズ群中の前記凸凹凸３枚接合レンズ以外
    の少なくとも１面の接合面前後での凹レンズの屈折率、
    凸レンズの屈折率、その接合面の曲率半径、及び、その
    接合面での最大開口数の光線が通る光線高である。
  2. 【請求項２】 下記の条件（４）、（５）を満足するこ
    とを特徴とする請求項１記載の高倍率顕微鏡対物レン
    ズ： （４） ３５＜νIVP ＜４５ （５） ５０＞νIVN ただし、νIVP 、νIVN はそれぞれ第４レンズ群Ｇ４の
    物体側に凹面を向けた接合メニスカスレンズの凸レンズ
    のアッベ数及び凹レンズのアッベ数である。
JP03303407A 1991-11-19 1991-11-19 高倍率顕微鏡対物レンズ Expired - Fee Related JP3140111B2 (ja)

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