JP3739295B2 - Optical instrument with two or more lenses positioned and fixed in the lens barrel - Google Patents

Optical instrument with two or more lenses positioned and fixed in the lens barrel Download PDF

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JP3739295B2
JP3739295B2 JP2001084926A JP2001084926A JP3739295B2 JP 3739295 B2 JP3739295 B2 JP 3739295B2 JP 2001084926 A JP2001084926 A JP 2001084926A JP 2001084926 A JP2001084926 A JP 2001084926A JP 3739295 B2 JP3739295 B2 JP 3739295B2
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lens
optical axis
barrel
conical surface
lens barrel
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JP2002286987A (en
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浩 渡辺
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Kantatsu Co Ltd
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Kantatsu Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)
  • Lens Barrels (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、複数のレンズを光軸方向に互いに当接させて重ね合わせることにより、光学的または物理的に向き合う互いのレンズ間の位置関係を決定することが可能なレンズの位置決め方法を適用した光学機器に関し、より具体的には、少なくとも二つ以上のレンズを共通の円錐面を介して光軸方向に互いに当接させて二つ以上のレンズ間の光軸及び光軸方向の距離に関する位置関係を決定すること、及び、これら二つ以上のレンズを光学系鏡筒内に位置決め保持した光学機器に関する。
【０００２】
【従来の技術】
複数のレンズを鏡筒内に位置決めする場合、従来、互いのレンズの光軸方向の距離は、複数のレンズをその周辺部で光軸方向に互いに当接させて、例えば、レンズコバ付近に設けた平面で当接させたり、マージマルナルコンタクトして当接させたりして決定し、また、互いのレンズにおける光軸の位置合わせは、個々のレンズの外径と該個々のレンズが鏡筒内において鏡筒の内面と当接する部分の鏡筒の内径で決めるか、又は、事前にレンズ同士で光軸調整したものを貼り合わせたりして鏡筒内に納め、これにより、レンズの光軸と光軸方向の距離の位置合わせをするようにしている。
【０００３】
図４は、相互のレンズを事前に貼り合わせて鏡筒内に納めるようにした従来の光学系鏡筒の要部断面図で、図中、１，２は事前に貼り合わされたレンズであって、レンズ１は光軸１０に垂直なコバ面１ａと１ｃを有し且つ外周部に光軸１０に平行な面１ｂを有する。また、レンズ２は光軸に垂直なコバ面２ａを有する。４はレンズ１を保持する鏡筒の一部であってレンズ１の受け面４ａを有する。レンズ１，２は鏡筒４へ挿入前に事前にレンズ相互の位置を調整しレンズ１のコバ面１ｃとレンズ２のコバ面２ａを互いに接着剤により接着している。レンズ２が貼り合わせられたレンズ１の当接面１ａは鏡筒４の光軸方向の受け面４ａに当接し、且つレンズ１の外周面１ｂは鏡筒４の内径４ｂに嵌合されている。
【０００４】
図５は、マージナルコンタクト構造を有する従来の光学系鏡筒の要部断面図で、図中、１，２はガラス製のレンズであり、４はレンズ１，２を保持する鏡筒の一部である。レンズ１，２は外周部にそれぞれ光軸１０と平行な面１ａと２ａを有し、鏡筒４も同じく光軸１０と平行な面４ａと４ｂを有し、この部分を嵌合させることによりレンズ１及びレンズ２の中心と光軸１０が一致するように構成されている。また、レンズ１は１８０度より小さな広角のマージナルコンタクト部１ｂを有し、この部分がレンズ２の曲面部と当接し、レンズ１とレンズ２の間隔が決定されている。
【０００５】
図６は、相互のレンズの位置関係を鏡筒を用いて決定する光学系鏡筒の要部断面図で、図中、１，２はレンズで、レンズ１は光軸１０に垂直なコバ面１ａを有し且つ外周部に光軸に平行な面１ｂを有し、同じく、レンズ２も光軸１０に垂直なコバ面２ａを有し外周部には光軸に平行な面２ｂを有する。４はレンズ１，２を保持する鏡筒の一部であってレンズ１の受け面４ａとレンズ２の受け面４ｃを有する。レンズ１は外周面１ｂと鏡筒４の内周面４ｂとを、又、レンズ２は外周面２ｂと鏡筒４の内周面４ｄとをそれぞ係合させることにより、レンズ１，２の中心が光軸１０と一致するように構成されている。また、レンズ１，２が鏡筒４に組み込まれた状態においては、レンズ１のコバ面１ａと鏡筒４の受け面４ａが当接しておりレンズ２のコバ面２ａと鏡筒４の受け面４ｃが当接しており、このことにより、レンズ１，２の位置関係が決定されている。
【０００６】
【発明が解決しようとする課題】
図４に示した光学系鏡筒においては、異質材料のレンズ同士を貼り合わせた場合、線膨張係数が異なるため環境温度が変化するとレンズが割れたりレンズ曲面が歪んだりする恐れがある。
【０００７】
図５に示した光学系鏡筒においては、個々のレンズのマージナルコンタクト部と外周の精度及び鏡筒の内径精度を高精度に保つ必要が有る。
また、レンズをマージナルコンタクト等により当接させて保持する場合には、マージナルコンタクト部に応力が集中し易いため、マージナルコンタクト構造の光学系にプラスチックなどの比較的低剛性の素材で形成されるレンズを使用すると個々のレンズ外周部の精度と鏡筒の内径精度を保ったとしてもレンズ面が歪み光学性能が劣化してくる等の問題があり、双方のレンズをガラス等の高剛性素材を用いて形成する必要があった。
【０００８】
また、図６に示した光学系鏡筒においては、レンズの外径と鏡筒の内径を係合させて光軸と垂直方向の位置決めを行っているため、やはり個々のレンズ外周部の精度とコバの厚みの精度及び鏡筒の内径精度を高精度に保つ必要が有り、複数のレンズの光軸を合わせ且つ互いに向き合うレンズの位置関係を決定するためには、個々のレンズの位置決め部位で鏡筒の内径精度とレンズの外径精度の２種類からなる構成部品において精度を保つ必要がある。
【０００９】
本発明は、上述のごとき実情に鑑みてなされたもので、鏡筒内おいて、最低限１つのレンズ位置を決定すれば次段の光軸方向に重なる複数のレンズの位置関係を決定することができる方法及び該方法を用いた光学機器を提供することを目的としてなされたものである。
【００１０】
【課題を解決するための手段】
請求項１の発明は、鏡筒と、該鏡筒内に挿入配設された二つ以上のレンズとから成り、第１のレンズはコバ外周部のリブの内壁部に光軸を中心とした円錐面を有し、第２のレンズはコバ外周部のリブの外壁部に光軸を中心としかつ前記第１のレンズのリブ内壁部に形成された円錐面と当接する円錐面を有し、さらに、前記第１のレンズは光軸と垂直な面を有し、かつ、前記鏡筒は該第１のレンズの垂直な面と当接する垂直な受け面を有しており、前記第１のレンズを前記鏡筒内に挿入することにより前記鏡筒の垂直な受け面に対して第１のレンズの垂直な面が当接されると共に、前記第１のレンズのリブ内壁部の円錐面と第２のレンズのリブ外壁部の円錐面が面当接して前記鏡筒内に収納され、前記第２のレンズのリブ外壁部の円錐斜面と前記鏡筒の垂直受け面とにより前記第１のレンズのコバ外周部を挟み込むようにして前記第２のレンズが該鏡筒に固定されており、前記円錐面の面当接により、前記第１のレンズと第２のレンズは前記円錐面以外の対向面間にクリアランスが設けられ、前記第１のレンズと第２のレンズが光軸及び光軸方向に同時に位置決めされていることを特徴としたものである。
【００１２】
請求項２の発明は、請求項１に記載の光学機器において、更にコバ外周部のリブ外壁部に光軸を中心とする円錐面を有する第３のレンズを有し、前記第２のレンズは前記円錐面が設けられている側と反対側においてコバ外周部のリブ内壁部に前記第３のレンズの円錐面と係合する第２の円錐面を有し、該第２の円錐面が前記第３のレンズの円錐面と面当接して前記鏡筒内に収納され、前記第２のレンズと第３のレンズは前記円錐面以外の対向面間にクリアランスが設けられ、前記第３のレンズが前記第２のレンズに代って前記鏡筒に固定されており、前記円錐面の面当接により、前記第１のレンズと第２のレンズと第３のレンズとが光軸及び光軸方向に同時に位置決めされていることを特徴としたものである。
【００１３】
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１のレンズは光軸方向においてのみ前記鏡筒の受け面に当接し、径方向にはクリアランスを有し、レンズ間の嵌合は円錐面で面当接し、前記各レンズの外周面と前記鏡筒の内壁面との相対面にはクリアランスが設けられていることを特徴としたものである。
【００１４】
請求項４の発明は、請求項１乃至３のいずれかの発明において、前記円錐面は、前記レンズのコバ円周方向の一部分、又は、複数箇所、又は、全周に設けられていることを特徴としたものである。
【００１６】
【発明の実施の形態】
本発明は、鏡筒内に光軸方向に互いに当接する少なくとも二つ以上のレンズを位置決め固定した光学機器に関するもので、第１のレンズを鏡筒の内部に挿入し、この第１のレンズを上記鏡筒内の受け面に当接させて光軸方向に位置決めした状態にし、この第１のレンズに次段の第２のレンズを当接させることにより互いに向き合うレンズの光軸と光軸方向の距離を位置決めし、鏡筒の挿入部付近で接着剤又は溶着により固定あるいは最終段レンズのコバ外周部を弾性体で光軸方向に加圧することで各レンズ同士の位置を保持するようにしたものである。
【００１７】
図３は、本発明が適用されるコバ外周のリブ面を説明するための図で、図中、１０は光軸、１１は該光軸１０を中心とした円錐、１２は該円錐１０の面の一部を示し、本発明は、この円錐１０の面の一部１２を介して２つのレンズを当接することにより、二つ以上のレンズの光軸合わせと光軸方向の距離合わせを同時に行うようにしたものである。
【００１８】
（実施例１）
図１は、本発明の一実施例を説明するための要部断面構成図で、図中、１，２は合成樹脂製のレンズ、４はレンズ１，２を保持する鏡筒である。レンズ１はコバ外周部のリブ内壁部に、光軸１０を中心とした円錐１１の面１ｂを有し、レンズ２はコバ外周部のリブ外壁部に、光軸１０を中心としレンズ１と同じ円錐１１の面２ａを有し、互いの円錐となる面１ｂと２ａが面当接し、鏡筒４の中に納まっている。５はレンズ２と鏡筒４を固定する接着剤で、レンズ１と鏡筒４は、図１に示すように、光軸１０方向においてのみレンズ１の面１ａと鏡筒４の受け面４ａが当接し、光軸１０と垂直方向（径方向）には僅かにクリアランスを有している。
【００１９】
上記実施例におけるレンズ位置決め保持方法としては、先ず、レンズ１を鏡筒４の右側より鏡筒４内に挿入し、次に、次段のレンズ２を同じく鏡筒４の右側より鏡筒４内に挿入する。このとき、レンズ１，２をその外周部で鏡筒４に嵌合させたり圧入したりするとレンズ１，２に変形を生じる恐れが大きいので、レンズ１，２の外径は鏡筒４の内径より小さく設定してある。このため、鏡筒４内にレンズ１，２をその順に挿入し、レンズ２のコバ外周部に図の右方向より荷重を加えると、レンズ１の受け面１ｂがレンズ２の受け面２ａに規制され、レンズ１は光軸１０と垂直の方向へ移動しレンズ１，２の中心が光軸１０と一致した状態となる。その後、鏡筒４の挿入部に接着剤５を注入してレンズ２のコバ外周部と鏡筒４とを固定することにより、図１に示す状態を得る。
【００２０】
上述のごとき構成のレンズ位置決め保持によると、レンズ１は接着剤５等により鏡筒４に直接固定されていないが、レンズ２のコバ部の円錐斜面２ａと鏡筒４の受け面４ａに挟み込まれているため、その位置がずれることはない。尚、レンズ１は接着されておらず、レンズ２の接着部分は、表面距離においてレンズ部分から離れた部分に設けられているため、接着剤５の収縮によりレンズ２が変形するのを防止できる効果がある。従って、接着剤５の硬化時の収縮によりレンズ２が引張られ、その位置がずれて光学性能が劣化することはない。また、鏡筒４はレンズ１の光軸１０と垂直な面１ａの受け面４ａを有し、この受け面４ａは光軸１０に対し垂直となる面に形成してある。
【００２１】
上述のごときレンズ相互間の位置決め方法によれば、レンズは鏡筒に対し嵌合を行うことなしに１段目のレンズと次段目のレンズを鏡筒内にその順に挿入するだけで互いのレンズの光軸と距離を決めることができ、相互のレンズを直接貼り合わせたり鏡筒側の内径精度を保つ必要がない上、高精度でレンズ相互間の光軸と位置関係を同時に位置決めできるという効果が得られる。
【００２２】
（実施例２）
図２は、本発明の他の実施例を説明するための要部断面構成図で、図中、１，２，３は合成樹脂製のレンズ、４はレンズ１，２，３を保持する鏡筒である。レンズ１は、コバ外周部のリブ内壁部に光軸１０を中心とした円錐１１1の面１ｂを有し、レンズ２は、コバ外周部のリブ外壁部に光軸１０を中心とし、レンズ１と同じ円錐１１1の面２ａを有し、且つ、該面２ａと反対側において、コバ外周部のリブ内壁部に光軸１０を中心とした円錐１１2の面２ｂを有し、レンズ３は、レンズ２と同じく、コバ外周部のリブ内壁部に光軸１０を中心とした円錐１１2の面３ａを有し且つ内周部には光軸１０を中心とした円錐１１3の面３ｂを有している。レンズ１，２，３は互いのコバの円錐となる面が互いに当接し鏡筒４の中に納まっている。
【００２３】
図２において、レンズ１と鏡筒４は、光軸１０方向においてのみレンズ１の面１ａと鏡筒４の受け面４ａが当接し光軸１０と垂直方向には僅かにクリアランスを有している。本実施形態におけるレンズ位置決め保持方法としては、先ず、レンズ１を鏡筒４の右側より鏡筒４内に挿入し、次に、次段のレンズ２，３を同じく鏡筒４の右側よりそれぞれの順に鏡筒４内に挿入する。このとき、レンズ１，２，３をその外周部で鏡筒４に嵌合させたり圧入したりするとレンズ１，２，３に変形を生じる恐れが大きいので、レンズ１，２，３の外径は鏡筒４の内径より小さく設定してある。このため、鏡筒４を固定し、レンズ３のコバ外周部に右側より荷重を加えるとレンズ１，２が鏡筒４の受け面４ａとレンズ３のコバ斜面３ａに規制され、レンズ１，２，３の中心が光軸１０と一致した状態となる。そして、鏡筒４の挿入部に接着剤５を注入しレンズ３のコバ外周部と鏡筒４とを固定することにより、図２に示す状態を得る。
【００２４】
上述のごとき構成のレンズ位置決め保持によると、レンズ１，２は接着剤５等により鏡筒４に直接固定されてはいないが、レンズ３のコバ部の円錐斜面３ａと鏡筒４の受け面４ａに挟み込まれているため、その位置がずれることはない。なお、レンズ１，２は接着されておらず、レンズ３の接着部分は表面距離においてはレンズ部分から離れた部分に設けてあるため、接着剤５の収縮によりレンズ３が変形するのを防止できる効果がある。従って、接着剤５の硬化時の収縮によりレンズ３が引張られその位置がずれて光学性能が劣化することはない。鏡筒４は、図２に示すように、レンズ１の光軸１０と垂直な面１ａの受け面４ａを有し、この受け面４ａは光軸１０に対し垂直となる面に形成してある。
このように、レンズコバのリブ内外周部に光軸を中心とした円錐の斜面を設けることで、複数のレンズを多段階に当接させレンズ間の光軸と位置関係を同時に決めることが出来る。
【００２５】
上述の各実施例に示した光学系鏡筒内のレンズ位置決めによれば、複数のレンズを鏡筒に容易に組み込むことができる上、これらの組み込まれた最終段のレンズを鏡筒に接着剤等で固定したとしても、光学性能の劣化を生ずることなく高い信頼性で位置決めし固定することができる。また、このような構成の位置決めは、写真用カメラや光学測定器等の光学機器に用いることができる。
【００２６】
以上に、本発明の実施例について説明したが、本発明は前述の実施例に限定されるものではなく、実際の製品開発において、種々の設計変更が可能であり、鏡筒に組み込むレンズの数を更に多くすることもできる。
【００２７】
【発明の効果】
以上に説明したように、本発明のレンズ位置決め方法によれば、コバ外周部のリブ内壁部に光軸を中心とした円錐の面を有するレンズを鏡筒内の受け面に当接させて、次いで、この鏡筒の内部にコバ外周部のリブ外壁部に光軸を中心とした円錐の面を有する次段のレンズを挿入することで、レンズ相互間の光軸と光軸方向における距離の位置関係を同時に決定出来、レンズ相互の位置調整や鏡筒の内径精度を不要とすることができ、接着剤等による固定方法においても、レンズの光学性能の劣化を防止することができる。
【００２８】
また、本発明の光学系位置決め方法が適用される光学機器では、一段めのレンズが鏡筒の受け面に当接した状態で鏡筒の内部に位置され、次段のレンズは一段めのレンズのコバ外周部の円錐斜面に光軸方向に当接した状態で上記鏡筒の内部に位置決めされ、且つ、当該鏡筒の挿入部位で接着剤により上記鏡筒に接着固定されているので、複数のレンズを保持する鏡筒に容易に組み込むことができ、しかも、これらのレンズは光学性能の劣化を生ずることなく、高い信頼性で位置決め、固定されている。
【図面の簡単な説明】
【図１】 本発明が適用された鏡筒の一実施例を説明するための要部断面図である。
【図２】 本発明が適用された鏡筒の他の実施例を説明するための要部断面図である。
【図３】 本発明によるレンズ位置決め方法に用いられる円錐面（リブ面）を説明するための図である。
【図４】 相互のレンズを事前に貼り合わせて鏡筒内に納めるようにした従来の光学系鏡筒の要部断面図である。
【図５】 マージナルコンタクト構造を有する従来の光学系鏡筒の要部断面図である。
【図６】 相互のレンズの位置関係を鏡筒を用いて決定する光学系鏡筒の要部断面図である。
【符号の説明】
１，２，３…レンズ、４…鏡筒、５…接着剤、１０…光軸、１１，１１1，１１2，１１3…円錐面。[0001]
BACKGROUND OF THE INVENTION
The present invention is applied by overlapping by contact with each other a plurality of lenses in the optical axis direction, the positioning how a lens capable of determining the positional relationship between each other of the lens facing the optical or physical More specifically, the present invention relates to an optical axis between two or more lenses and a distance in the optical axis direction by bringing at least two or more lenses into contact with each other in the optical axis direction via a common conical surface. The present invention relates to determining the positional relationship and to an optical apparatus in which these two or more lenses are positioned and held in an optical system barrel.
[0002]
[Prior art]
When positioning a plurality of lenses in the lens barrel, conventionally, the distance in the optical axis direction of each lens is provided in the vicinity of the lens edge, for example, by bringing the plurality of lenses into contact with each other in the optical axis direction at the periphery. The position of the optical axis in each lens is determined by contact with a flat surface or contact with a marginal contact. In this case, it is determined by the inner diameter of the lens barrel in contact with the inner surface of the lens barrel, or the optical axis adjusted between the lenses in advance is pasted together and placed in the lens barrel. The distance in the optical axis direction is aligned.
[0003]
FIG. 4 is a cross-sectional view of a main part of a conventional optical lens barrel in which mutual lenses are bonded in advance and placed in the lens barrel. In the figure, reference numerals 1 and 2 denote lenses bonded in advance. The lens 1 has edge surfaces 1a and 1c perpendicular to the optical axis 10 and a surface 1b parallel to the optical axis 10 on the outer periphery. The lens 2 has an edge surface 2a perpendicular to the optical axis. Reference numeral 4 denotes a part of a lens barrel that holds the lens 1 and has a receiving surface 4 a of the lens 1. Before the lenses 1 and 2 are inserted into the lens barrel 4, the positions of the lenses are adjusted in advance, and the edge surface 1c of the lens 1 and the edge surface 2a of the lens 2 are bonded to each other with an adhesive. The contact surface 1 a of the lens 1 to which the lens 2 is bonded is in contact with the receiving surface 4 a in the optical axis direction of the lens barrel 4, and the outer peripheral surface 1 b of the lens 1 is fitted to the inner diameter 4 b of the lens barrel 4. .
[0004]
FIG. 5 is a cross-sectional view of a main part of a conventional optical barrel having a marginal contact structure, in which 1 and 2 are glass lenses, and 4 is a part of a barrel holding the lenses 1 and 2. It is. The lenses 1 and 2 have surfaces 1a and 2a parallel to the optical axis 10 on the outer peripheral portion, respectively, and the lens barrel 4 also has surfaces 4a and 4b parallel to the optical axis 10 by fitting these portions. The center of the lens 1 and the lens 2 is configured to coincide with the optical axis 10. Further, the lens 1 has a wide-angle marginal contact portion 1b smaller than 180 degrees, and this portion abuts on the curved surface portion of the lens 2, and the distance between the lens 1 and the lens 2 is determined.
[0005]
FIG. 6 is a cross-sectional view of the main part of the optical system barrel that determines the positional relationship between the lenses using a barrel. In the figure, 1 and 2 are lenses, and the lens 1 is a cover surface perpendicular to the optical axis 10. The lens 2 also has a surface 1b parallel to the optical axis, and the lens 2 also has an edge surface 2a perpendicular to the optical axis 10, and has a surface 2b parallel to the optical axis on the outer periphery. Reference numeral 4 denotes a part of a lens barrel that holds the lenses 1 and 2, and includes a receiving surface 4 a of the lens 1 and a receiving surface 4 c of the lens 2. The lens 1 is engaged with the outer peripheral surface 1b and the inner peripheral surface 4b of the lens barrel 4, and the lens 2 is engaged with the outer peripheral surface 2b and the inner peripheral surface 4d of the lens barrel 4, respectively. The center is configured to coincide with the optical axis 10. When the lenses 1 and 2 are incorporated in the lens barrel 4, the edge surface 1 a of the lens 1 and the receiving surface 4 a of the lens barrel 4 are in contact with each other, and the edge surface 2 a of the lens 2 and the receiving surface of the lens barrel 4 are in contact. 4c is in contact, and this determines the positional relationship between the lenses 1 and 2.
[0006]
[Problems to be solved by the invention]
In the optical system barrel shown in FIG. 4, when lenses of different materials are bonded together, the linear expansion coefficient is different, and therefore the lens may be broken or the lens curved surface may be distorted when the environmental temperature changes.
[0007]
In the optical system lens barrel shown in FIG. 5, it is necessary to maintain the accuracy of the marginal contact portion and the outer periphery of each lens and the accuracy of the inner diameter of the lens barrel.
In addition, when the lens is held in contact with a marginal contact or the like, stress tends to concentrate on the marginal contact portion, so a lens formed of a relatively low rigidity material such as plastic in the optical system of the marginal contact structure. However, there is a problem that the lens surface is distorted and the optical performance deteriorates even if the accuracy of the outer periphery of each lens and the accuracy of the inner diameter of the lens barrel are maintained. It was necessary to form.
[0008]
Further, in the optical system lens barrel shown in FIG. 6, since the outer diameter of the lens and the inner diameter of the lens barrel are engaged to perform positioning in the direction perpendicular to the optical axis, the accuracy of the outer periphery of each lens is also increased. It is necessary to keep the precision of the edge thickness and the precision of the inner diameter of the lens barrel. In order to determine the positional relationship of the lenses that align the optical axes of a plurality of lenses and face each other, a mirror is used at each lens positioning part. It is necessary to maintain accuracy in the component parts composed of two types of the inner diameter accuracy of the cylinder and the outer diameter accuracy of the lens.
[0009]
The present invention has been made in view of the above-described circumstances, and determines the positional relationship of a plurality of lenses overlapping in the optical axis direction of the next stage if at least one lens position is determined in a lens barrel. And an optical apparatus using the method.
[0010]
[Means for Solving the Problems]
The invention of claim 1 comprises a lens barrel and two or more lenses inserted and disposed in the lens barrel, and the first lens is centered on the optical axis at the inner wall portion of the rib on the outer periphery of the edge. has a conical surface, the second lens has a conical surface of the outer wall portion conical surface abutting formed in the rib inner wall of the central Toshikatsu the first lens optical axis of the rib of the edge peripheral portion Further, the first lens has a surface perpendicular to the optical axis, and the lens barrel has a vertical receiving surface abutting on the surface perpendicular to the first lens. By inserting the lens in the lens barrel, the vertical surface of the first lens is brought into contact with the vertical receiving surface of the lens barrel, and the conical surface of the rib inner wall portion of the first lens When the conical surface of the rib outer wall portion of the second lens is accommodated in the barrel in contact with the surface those, before and conical slope of the rib outer wall of said second lens Wherein the vertical receiving surface of the lens barrel so as to sandwich the edge peripheral portion of the first lens second lens is fixed to lens barrel, the surface contact of the conical surface, the first lens and the second lens clearance is provided between the facing surfaces other than the conical surface, that the first lens and the second lens is characterized in that it is positioned at the same time the optical axis and the optical axis It is.
[0012]
According to a second aspect of the present invention, in the optical apparatus according to the first aspect, the rib outer wall portion of the outer periphery of the edge further includes a third lens having a conical surface centered on the optical axis, and the second lens is On the opposite side of the side where the conical surface is provided, there is a second conical surface that engages with the conical surface of the third lens on the rib inner wall portion of the outer periphery of the edge, and the second conical surface is The third lens is brought into surface contact with the conical surface of the third lens and housed in the lens barrel, and the second lens and the third lens are provided with a clearance between opposing surfaces other than the conical surface, and the third lens Is fixed to the lens barrel instead of the second lens, and the first lens, the second lens, and the third lens are connected to each other by the surface contact of the conical surface. It is characterized by being simultaneously positioned in the direction.
[0013]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the first lens abuts against the receiving surface of the barrel only in the optical axis direction, has a clearance in the radial direction, and is fitted between the lenses. if the surface in contact with a conical surface, the the relative surface of the inner wall surface of the barrel and the outer peripheral surface of the lens is obtained by, characterized in that clearances are provided.
[0014]
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the conical surface is provided in a part, a plurality of locations, or the entire circumference of the edge of the lens. It is a feature.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an optical device in which at least two or more lenses that are in contact with each other in the optical axis direction are positioned and fixed in a lens barrel. The first lens is inserted into the lens barrel, and the first lens is a state of being positioned in the optical axis direction is brought into contact with the receiving surface in the barrel, the optical axis and the optical axis direction of the mutually facing lens by contacting the next stage of the second lens in the first lens The position of each lens is held by fixing the distance around the insertion portion of the lens barrel by an adhesive or welding or pressing the outer peripheral portion of the last lens in the optical axis direction with an elastic body. Is.
[0017]
FIG. 3 is a view for explaining the rib surface on the outer periphery of the edge to which the present invention is applied. In the figure, 10 is an optical axis, 11 is a cone centered on the optical axis 10, and 12 is a surface of the cone 10. In the present invention, the two lenses are brought into contact with each other via a part 12 of the surface of the cone 10 to simultaneously adjust the optical axes of two or more lenses and the distance in the optical axis direction. It is what I did.
[0018]
Example 1
FIG. 1 is a cross-sectional view of an essential part for explaining an embodiment of the present invention. In the figure, reference numerals 1 and 2 denote lenses made of synthetic resin, and reference numeral 4 denotes a lens barrel for holding the lenses 1 and 2. The lens 1 has a surface 1b of a cone 11 centered on the optical axis 10 on the rib inner wall of the outer periphery of the edge, and the lens 2 is the same as the lens 1 centered on the optical axis 10 of the rib outer wall of the outer periphery of the edge. A surface 2 a of the cone 11 is provided, and the surfaces 1 b and 2 a that are the cones of each other are in surface contact with each other and are contained in the lens barrel 4. Reference numeral 5 denotes an adhesive for fixing the lens 2 and the lens barrel 4. As shown in FIG. 1, the lens 1 and the lens barrel 4 have a surface 1a of the lens 1 and a receiving surface 4a of the lens barrel 4 only in the optical axis 10 direction. It abuts and has a slight clearance in the direction perpendicular to the optical axis 10 (radial direction).
[0019]
As the lens positioning and holding method in the above embodiment, first, the lens 1 is inserted into the lens barrel 4 from the right side of the lens barrel 4, and then the next stage lens 2 is similarly inserted into the lens barrel 4 from the right side of the lens barrel 4. Insert into. At this time, if the lenses 1 and 2 are fitted or pressed into the lens barrel 4 at the outer periphery thereof, the lenses 1 and 2 are likely to be deformed. Therefore, the outer diameter of the lenses 1 and 2 is the inner diameter of the lens barrel 4. It is set smaller. For this reason, when the lenses 1 and 2 are inserted into the lens barrel 4 in that order and a load is applied to the edge of the edge of the lens 2 from the right in the figure, the receiving surface 1b of the lens 1 is restricted to the receiving surface 2a of the lens 2. Then, the lens 1 moves in a direction perpendicular to the optical axis 10 and the centers of the lenses 1 and 2 are aligned with the optical axis 10. Then, the state shown in FIG. 1 is obtained by injecting the adhesive 5 into the insertion portion of the lens barrel 4 and fixing the outer periphery of the lens 2 and the lens barrel 4.
[0020]
According to the lens positioning and holding as described above, the lens 1 is not directly fixed to the lens barrel 4 by the adhesive 5 or the like, but is sandwiched between the conical slope 2a of the edge portion of the lens 2 and the receiving surface 4a of the lens barrel 4. Therefore, the position does not shift. In addition, since the lens 1 is not adhered, and the adhesion portion of the lens 2 is provided at a portion away from the lens portion in the surface distance, it is possible to prevent the lens 2 from being deformed by contraction of the adhesive 5. There is. Therefore, the lens 2 is pulled by contraction when the adhesive 5 is cured, and the optical performance is not deteriorated due to the displacement of the position. The lens barrel 4 has a receiving surface 4 a that is a surface 1 a perpendicular to the optical axis 10 of the lens 1, and the receiving surface 4 a is formed on a surface that is perpendicular to the optical axis 10.
[0021]
According to the positioning method between the lenses as described above, the lenses can be connected to each other only by inserting the first-stage lens and the next-stage lens into the lens barrel in that order without engaging the lens barrel. It is possible to determine the optical axis and distance of the lens, and it is not necessary to stick each other's lens directly or to maintain the inner diameter accuracy of the lens barrel side, and it is possible to position the optical axis and the positional relationship between the lenses simultaneously with high accuracy. An effect is obtained.
[0022]
(Example 2)
FIG. 2 is a cross-sectional view of an essential part for explaining another embodiment of the present invention, in which 1, 2, 3 are lenses made of synthetic resin, and 4 is a mirror for holding the lenses 1, 2, 3. It is a cylinder. The lens 1 has a surface 1b of a cone 11 1 centered on the optical axis 10 on the rib inner wall portion of the outer peripheral portion of the edge, and the lens 2 is centered on the optical axis 10 on the rib outer wall portion of the outer peripheral portion of the lens 1. It has the same cone 11 first surface 2a and, and on the opposite side of said surface 2a, has a conical 11 2 face 2b around the optical axis 10 to the rib inner wall of the flange outer peripheral portion, the lens 3 Like the lens 2, the rib inner wall portion of the outer periphery of the edge has a surface 3 a of the cone 11 2 centered on the optical axis 10, and the surface 3 b of the cone 11 3 centered on the optical axis 10 is formed on the inner periphery. Have. The lenses 1, 2, and 3 are accommodated in the lens barrel 4 in such a manner that the surfaces that form the cones of the edges are in contact with each other.
[0023]
In FIG. 2, the lens 1 and the lens barrel 4 are in contact with the surface 1 a of the lens 1 and the receiving surface 4 a of the lens barrel 4 only in the direction of the optical axis 10, and have a slight clearance in the direction perpendicular to the optical axis 10. . As a lens positioning and holding method in the present embodiment, first, the lens 1 is inserted into the lens barrel 4 from the right side of the lens barrel 4, and then the next stage lenses 2 and 3 are respectively inserted from the right side of the lens barrel 4. It inserts in the lens-barrel 4 in order. At this time, if the lenses 1, 2, 3 are fitted or pressed into the lens barrel 4 at the outer periphery, the lenses 1, 2, 3 are likely to be deformed. Is set smaller than the inner diameter of the lens barrel 4. For this reason, when the lens barrel 4 is fixed and a load is applied to the outer peripheral portion of the edge of the lens 3 from the right side, the lenses 1 and 2 are regulated by the receiving surface 4a of the lens barrel 4 and the edge inclined surface 3a of the lens 3. , 3 coincide with the optical axis 10. Then, the state shown in FIG. 2 is obtained by injecting the adhesive 5 into the insertion portion of the lens barrel 4 and fixing the outer peripheral portion of the lens 3 and the lens barrel 4.
[0024]
According to the lens positioning and holding configuration as described above, the lenses 1 and 2 are not directly fixed to the lens barrel 4 by the adhesive 5 or the like, but the conical slope 3a at the edge of the lens 3 and the receiving surface 4a of the lens barrel 4. The position is not shifted because it is sandwiched between the two. The lenses 1 and 2 are not bonded, and the bonding portion of the lens 3 is provided at a portion away from the lens portion in terms of the surface distance, so that the lens 3 can be prevented from being deformed by the shrinkage of the adhesive 5. effective. Therefore, the lens 3 is pulled by the shrinkage when the adhesive 5 is cured, and the position thereof is not shifted and the optical performance is not deteriorated. As shown in FIG. 2, the lens barrel 4 has a receiving surface 4 a that is a surface 1 a that is perpendicular to the optical axis 10 of the lens 1, and this receiving surface 4 a is formed on a surface that is perpendicular to the optical axis 10. .
As described above, by providing a conical slope centered on the optical axis at the inner and outer peripheral portions of the ribs of the lens edge, a plurality of lenses can be contacted in multiple stages, and the optical axis and the positional relationship between the lenses can be determined simultaneously.
[0025]
According to the lens positioning in the optical system barrel shown in each of the above-described embodiments, a plurality of lenses can be easily incorporated into the barrel, and the last stage of the incorporated lenses is attached to the barrel. Even if it is fixed by, etc., it can be positioned and fixed with high reliability without causing deterioration of optical performance. In addition, the positioning of such a configuration can be used for an optical apparatus such as a photographic camera or an optical measuring instrument.
[0026]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made in actual product development, and the number of lenses incorporated in the lens barrel. Can be further increased.
[0027]
【The invention's effect】
As described above, according to the lens positioning method of the present invention, the lens having a conical surface centered on the optical axis is brought into contact with the receiving surface in the lens barrel on the rib inner wall portion of the outer periphery of the edge, Next, by inserting a next-stage lens having a conical surface centered on the optical axis into the rib outer wall of the outer periphery of the edge inside the lens barrel, the distance between the optical axis between the lenses and the optical axis direction can be reduced. The positional relationship can be determined at the same time, the position adjustment between the lenses and the inner diameter accuracy of the lens barrel can be made unnecessary, and the optical performance of the lens can be prevented from being deteriorated even in the fixing method using an adhesive or the like.
[0028]
In the optical apparatus to which the optical system positioning method of the present invention is applied, the first lens is positioned inside the lens barrel in contact with the receiving surface of the lens barrel, and the next lens is the first lens. Are positioned inside the lens barrel in contact with the conical slope of the outer peripheral portion of the edge in the optical axis direction, and are fixedly bonded to the lens barrel by an adhesive at the insertion site of the lens barrel. These lenses can be easily incorporated into a lens barrel that holds these lenses, and these lenses are positioned and fixed with high reliability without causing deterioration of optical performance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part for explaining an embodiment of a lens barrel to which the present invention is applied.
FIG. 2 is a cross-sectional view of an essential part for explaining another embodiment of a lens barrel to which the present invention is applied.
FIG. 3 is a view for explaining a conical surface (rib surface) used in the lens positioning method according to the present invention.
FIG. 4 is a cross-sectional view of a main part of a conventional optical system barrel in which mutual lenses are bonded in advance and stored in the barrel.
FIG. 5 is a cross-sectional view of a main part of a conventional optical barrel having a marginal contact structure.
FIG. 6 is a cross-sectional view of a main part of an optical system barrel that determines the positional relationship between the lenses using a barrel.
[Explanation of symbols]
1, 2, 3 lens, 4 ... barrel, 5 ... adhesive, 10 ... optical axis, 11, 11 1, 11 2, 11 3 ... conical surface.

Claims (4)

鏡筒と、該鏡筒内に挿入配設された二つ以上のレンズとから成り、第１のレンズはコバ外周部のリブの内壁部に光軸を中心とした円錐面を有し、第２のレンズはコバ外周部のリブの外壁部に光軸を中心としかつ前記第１のレンズのリブ内壁部に形成された円錐面と当接する円錐面を有し、さらに、前記第１のレンズは光軸と垂直な面を有し、かつ、前記鏡筒は該第１のレンズの垂直な面と当接する垂直な受け面を有しており、前記第１のレンズを前記鏡筒内に挿入することにより前記鏡筒の垂直な受け面に対して第１のレンズの垂直な面が当接されると共に、前記第１のレンズのリブ内壁部の円錐面と第２のレンズのリブ外壁部の円錐面が面当接して前記鏡筒内に収納され、前記第２のレンズのリブ外壁部の円錐斜面と前記鏡筒の垂直受け面とにより前記第１のレンズのコバ外周部を挟み込むようにして前記第２のレンズが該鏡筒に固定されており、前記円錐面の面当接により、前記第１のレンズと第２のレンズは前記円錐面以外の対向面間にクリアランスが設けられ、前記第１のレンズと第２のレンズが光軸及び光軸方向に同時に位置決めされていることを特徴とする光学機器。The lens barrel and two or more lenses inserted and disposed in the lens barrel, the first lens has a conical surface centered on the optical axis on the inner wall portion of the rib on the outer periphery of the edge, 2 of lens has a conical surface of the outer wall portion conical surface abutting formed in the rib inner wall of the central Toshikatsu the first lens optical axis of the rib of the edge peripheral portion, further, the first The lens has a surface perpendicular to the optical axis, and the lens barrel has a vertical receiving surface that abuts the surface perpendicular to the first lens, and the first lens is placed in the lens barrel. ribs of the first with the vertical plane of the lens is in contact, said first conical surface of the rib inner wall of the lens and the second lens with respect to the vertical receiving surface of the lens barrel by inserting the conical surface of the outer wall portion is accommodated in the barrel in contact with the surface those vertical receiving surface of the lens barrel and the conical slope of the rib outer wall of said second lens The first lens of the edge peripheral portion and the second lens so as to sandwich the is fixed to the lens barrel by, the surface contact of the conical surface, the first lens and the second lens An optical apparatus, wherein a clearance is provided between opposing surfaces other than the conical surface, and the first lens and the second lens are simultaneously positioned in the optical axis and the optical axis direction. 請求項１に記載の光学機器において、更にコバ外周部のリブ外壁部に光軸を中心とする円錐面を有する第３のレンズを有し、前記第２のレンズは前記円錐面が設けられている側と反対側においてコバ外周部のリブ内壁部に前記第３のレンズの円錐面と係合する第２の円錐面を有し、該第２の円錐面が前記第３のレンズの円錐面と面当接して前記鏡筒内に収納され、前記第２のレンズと第３のレンズは前記円錐面以外の対向面間にクリアランスが設けられ、前記第３のレンズが前記第２のレンズに代って前記鏡筒に固定されており、前記円錐面の面当接により、前記第１のレンズと第２のレンズと第３のレンズとが光軸及び光軸方向に同時に位置決めされていることを特徴とする光学機器。The optical apparatus according to claim 1, further comprising a third lens having a conical surface centered on the optical axis at a rib outer wall portion of the outer peripheral portion of the edge, and the second lens is provided with the conical surface. A rib conical surface engaging with the conical surface of the third lens on the rib inner wall portion of the outer periphery of the edge on the side opposite to the side where the conical surface is located, and the second conical surface is a conical surface of the third lens And the second lens and the third lens are provided with a clearance between the opposing surfaces other than the conical surface, and the third lens serves as the second lens. Instead, it is fixed to the lens barrel, and the first lens, the second lens, and the third lens are simultaneously positioned in the optical axis and optical axis directions by the surface contact of the conical surface. An optical apparatus characterized by that. 前記第１のレンズは光軸方向においてのみ前記鏡筒の受け面に当接し、径方向にはクリアランスを有し、レンズ間の嵌合は円錐面で面当接し、前記各レンズの外周面と前記鏡筒の内壁面との相対面にはクリアランスが設けられていることを特徴とする請求項１又は２に記載の光学機器。Wherein the first lens is in contact with the receiving surface of the lens barrel only in the direction of the optical axis, it has a clearance in the radial direction, fitting between the lens surface in contact with the conical surface, and the outer peripheral surface of each of the lenses the optical apparatus according to claim 1 or 2, characterized in that the relative surface of the inner wall surface of the barrel and the clearance is provided. 前記円錐面は、前記レンズのコバ円周方向の一部分、又は、複数箇所、又は、全周に設けられていることを特徴とする請求項１乃至３のいずれかに記載の光学機器。  4. The optical apparatus according to claim 1, wherein the conical surface is provided in a part, a plurality of places, or the entire circumference of the lens in a circumferential direction of the edge. 5.
JP2001084926A 2001-03-23 2001-03-23 Optical instrument with two or more lenses positioned and fixed in the lens barrel Expired - Lifetime JP3739295B2 (en)

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JP2001084926A JP3739295B2 (en) 2001-03-23 2001-03-23 Optical instrument with two or more lenses positioned and fixed in the lens barrel

Related Child Applications (1)

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JP2005187058A Division JP2005338869A (en) 2005-06-27 2005-06-27 Method for positioning and fixing two or more lenses in lens barrel and optical equipment applying the same

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JP2002286987A JP2002286987A (en) 2002-10-03
JP3739295B2 true JP3739295B2 (en) 2006-01-25

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