JP4037665B2 - Lens barrel shading device - Google Patents

Lens barrel shading device Download PDF

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JP4037665B2
JP4037665B2 JP2002076778A JP2002076778A JP4037665B2 JP 4037665 B2 JP4037665 B2 JP 4037665B2 JP 2002076778 A JP2002076778 A JP 2002076778A JP 2002076778 A JP2002076778 A JP 2002076778A JP 4037665 B2 JP4037665 B2 JP 4037665B2
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frame
light shielding
light
shielding member
lens barrel
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JP2003270507A (en
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浩司 松本
俊文 中野
保 小岩井
拓 新井
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Olympus Corp
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Olympus Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、レンズ鏡筒における枠間の遮光装置の構造に関する。
【０００２】
【従来の技術】
従来、相対回転、および、相対直進移動する枠部材を有するレンズ鏡筒の構造に関して提案された特開２０００−６６０７８号公報に開示のものでは、枠部材を相対的に直進移動させるための直進ガイドがレンズ鏡筒内部に収容された構造が採用されている。
【０００３】
上記構成を有するレンズ鏡筒では、直進ガイドを枠の内部に設けたことによりレンズ鏡筒全体の径方向の大きさが直進ガイド部材の占有エリア分だけ大きくなり、レンズ鏡筒のコンパクト化が難しかった。
【０００４】
そこで、コンパクト化と構成部品点数を減らすことができるレンズ鏡筒として、上記直進ガイド部材を用いず、内枠部材の外周面に直進ガイド用の直進ガイド溝を設け、外枠部材のガイド突起を上記直進ガイド溝に摺動自在に嵌入させて上記内枠部材を直進ガイドするようなレンズ鏡筒が考えられる。
【０００５】
【発明が解決しようとする課題】
上述した内枠部材に上記直進ガイド溝を設けたレンズ鏡筒では、互いに摺動移動する外枠部材と内枠部材の直進ガイド機構を含む隙間の遮光を行う必要がある。外枠部材と内枠部材間の直進ガイド溝回りには凹凸部が形成されており、その凹凸部の遮光を摺動抵抗の少ない状態で行わなければならない。例えば、上記凹部に弾性変形可能なゴムリングなどの遮光部材を枠部材に嵌め込むとすると、上記ゴムリングを押さえ付けるために大きな締め付け力を必要とし、その締め付け力によりレンズ鏡筒の進退駆動力が増大する可能がある。また、レンズ鏡筒に外力が作用した場合でも、外枠部材と内枠部材間に設けた直進ガイド用の凹凸部での遮光状態を安定して維持しなければならないといった問題があった。
【０００６】
本発明は、上述の問題を解決するためになされたものであり、枠部材間の直進ガイド部の隙間の遮光を確実に行い、しかも、レンズ鏡筒のコンパクト化が可能なレンズ鏡筒の遮光装置を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明の第１のレンズ鏡筒の遮光装置は、第１の枠と、上記第１の枠の内部に配され、上記第１の枠に対し光軸方向に相対的に移動可能な第２の枠と、上記第１の枠の内周側に形成された直進ガイド部と、上記第２の枠の外周側に形成され、上記直進ガイド部と係合する係合部と、上記第１の枠と第２の枠との間に配され、第１の枠と第２の枠との間を光密に保つための遮光部材と、を具備し、上記係合部は、略小半円形状の断面形状をなし、上記遮光部材は、上記第２の枠の係合部と係合する第１の遮光部と、上記第２の枠の円弧部に当接する第２の遮光部とからなり、
上記直進ガイド部は、上記第１の枠の内部に向けて突出する突起からなり、上記係合部は、上記突起と係合可能な溝からなるとともに、上記第１の遮光部は上記溝に対して押圧された状態で係合され、上記第２の遮光部は上記第２の枠の円弧部に対して非押圧状態で当接されていることを特徴とする。
【０００８】
本発明の第２のレンズ鏡筒の遮光装置は、第１の枠と、上記第１の枠の内部に配され、上記第１の枠に対し光軸方向に相対的に移動可能な第２の枠と、上記第１の枠の内周側に形成された直進ガイド部と、上記第２の枠の外周側に形成され、上記直進ガイド部と係合する係合部と、上記第１の枠と第２の枠との間に配され、第１の枠と第２の枠との間を光密に保つための遮光部材と、を具備し、上記係合部は、略小半円形状の断面形状をなし、上記遮光部材は、上記第２の枠の係合部と係合する第１の遮光部と、上記第２の枠の円弧部に当接する第２の遮光部とからなり、
上記直進ガイド部は、上記第１の枠の内側に形成された凹部からなり、上記係合部は、上記凹部と係合可能な突条からなるとともに、上記第１の遮光部は上記突条に対して非押圧状態で係合され、上記第２の遮光部は上記第２の枠の円弧部に対して押圧された状態で当接されていることを特徴とする。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図に基づいて説明する。
図１は、本発明の第１の実施形態の遮光構造を有するレンズ鏡筒の分解斜視図である。図２は、上記レンズ鏡筒の縦断面図であり、上半部がズームワイド状態、下半部がズームテレ状態を示す。図３，４は、上記レンズ鏡筒の遮光部回りの断面を示し、図３は、図１のＡ−Ａ断面部分の断面図であり、図４は、図１のＢ−Ｂ断面部分の断面図である。また、図５（Ａ），（Ｂ）は、円周遮光部材部分、または、溝遮光部材部分の光軸直交断面を示す図であって、図５（Ａ）は、図３のＣ−Ｃ断面図であり、図５（Ｂ）は、図３のＤ−Ｄ断面図である。
なお、以下の説明において、レンズ鏡筒の被写体側を前方とし、像側を後方とする。
【００１１】
本実施形態のレンズ鏡筒９は、図１，２に示すように主に固定枠（図示せず）と、固定枠に回転自在に支持される回転枠１と、固定枠に対して直進進退可能にガイドされ、回転枠１の外周部に相対回転可能に嵌入される第１の枠である外枠２と、外枠２の内周部に進退自在に嵌入する第２の枠である内枠３と、内枠３の外周部に摺動自在に嵌入する遮光部材である溝遮光部材４および円周遮光部材５と、溝遮光部材４の外周に嵌合する押圧部材であるバネリング６とを有してなる。
【００１２】
上記回転枠１は、円環部材であって、回転枠１の後方リング部１ｂの外周に沿ってヘリコイド雄ねじと平歯車部とが重畳して配置されている。また、上記後方リング部１ｂの前方の外周に沿って外周溝１ｃが配置されている。さらに、回転枠１の内周には、内枠３を進退駆動するための３本のカム溝１ｄが配置されている。
【００１３】
上記回転枠１のヘリコイド雄ねじと平歯車部は、固定枠（図示せず）側のヘリコイド雌ねじおよび長尺ギヤに螺合、または、噛合しており、回転枠１は、長尺ギヤにより回転駆動されると、上記ヘリコイド雌ねじによって回転進退駆動される。
【００１４】
上記外枠２は、同様に円環部材であって、外枠２の前端面の内方側に位置する内方フランジ部２ｆを有している。その内方フランジ部２ｆの内周には、内側に突出する略小半円形状の６つのガイド突起（直進ガイド部）２ａ、および、上記ガイド突起２ａの間に配される６つの内周円弧面２ｇとが略等間隔に配置される。なお、上記内周円弧面２ｇの円弧中心は、撮影レンズの光軸Ｏ、または、外枠２の中心とするが、それ以外の光軸Ｏと平行な軸心であってもよい。
【００１５】
さらに、外枠２の外周後端側のピン穴２ｅにはピン８が固着されている。 上記ピン８の外径側に突出する部が固定枠の直進ガイド溝（図示せず）に摺動自在に嵌入するガイドピン部となり、ピン８の外枠２の内周面側に突出する部分が回転枠１の外周溝１ｃに摺動自在に嵌入するガイドピン部となる。したがって、外枠２は、固定枠により回転規制された状態で、かつ、回転枠１の光軸Ｏ方向の移動と一体の状態で光軸Ｏに沿って進退駆動される。
【００１６】
上記内枠３は、同様に円環状部材であって、光軸Ｏに沿った略小半円溝形状の６本の直進ガイド溝（係合部）３ａと、上記直進ガイド溝３ａの間を結ぶ６つの円弧部からなる外周円筒面３ｇとが配置される。さらに、外周後端部にカムフォロア７が固着されている。上記内枠３の直進ガイド溝３ａと、外枠２のガイド突起２ａとは、互いに係合可能な円周上位置に配置されている。また、溝遮光部材４を密着し易くするために上記直進ガイド溝３ａと外周円筒面３ｇとの接続部分は円弧面で接続されている。
【００１７】
そして、上記内枠３は、外枠２に対して外枠２の内周円弧面２ｇに外周円筒面３ｇを嵌入させ、かつ、外枠２のガイド突起２ａに内枠３の直進ガイド溝３ａを回転規制状態で係合して組み付けられる。したがって、内枠３は、外枠２に対して進退可能状態で支持される。なお、内枠３の内周部には、撮影レンズを保持するレンズ枠（図示せず）等が内蔵される。
【００１８】
上記円周遮光部材５は、弾性変形可能なシリコンゴム等の材料で形成されるリング形状の部材である。この円周遮光部材５の第２の遮光部としての内径部は、その自由状態で内枠３の外周円筒面３ｇの径より圧入代分だけ僅かに小さい。この円周遮光部材５は、図３，４に示すように外枠２の内方フランジ部２ｆの内側と後述する溝遮光部材４との間に挿入された状態で内枠３の外周円筒面３ｇに圧入され、摺動自在に支持される。
【００１９】
上記バネリング６は、ステンレス薄板バネ材料で形成される略リング形状の押圧部材であって、内方フランジ部６ｂと、その内方フランジ部６ｂの内側に突出する略小半円形状突起の回転規制用の６つのストッパ６ａと、外周の６箇所にて一旦光軸Ｏと平行な方向に折り曲げられ、さらに、外周に沿って所定の方向に延びる弾性変形可能な板バネ部６ｄと、その板バネ部６ｄの先端に設けられる略小半円形凸状の爪部６ｃとを有している。なお、上記爪部６ｃの円周上位置は、ストッパ６ａの円周上の配置位置方向と一致し、さらに、組み付け状態で内枠３の直進ガイド溝３ａの円周上の配置位置方向に一致している。
【００２０】
上記溝遮光部材４は、弾性変形可能な人工皮革等の材料で形成されるリング形状の部材であって、溝遮光部材４の内径部は、自由状態で図４に示すように内枠３の外周部の外径に対して隙間のある寸法とする。
【００２１】
そして、溝遮光部材４は、図３，４に示すようにバネリング６の内周部に内方フランジ部６ｂに当接した状態で接着固定される。上記接着状態で溝遮光部材４は、バネリング６の爪部６ｃによってその当接部内周部分が第１の遮光部である突部（凸部）４ｃとして押し出された状態になる（図５（Ｂ））。上記突部４ｃの半径方向位置は、バネリング６のストッパ６ａ上で圧入代分だけ僅かに内側に突出している。
【００２２】
上記バネリング６と、バネリング６に接着固定された上記溝遮光部材４は、図３，４に示すように内枠３の直進ガイド溝３ａに突部４ｃおよびバネリング６のストッパ６ａを係合させた状態で内枠３の外周に挿入され、同時に上記溝遮光部材４は、内枠３に嵌合している外枠２の内周部であって、円周遮光部材５の後方で、回転枠１の前端面の前位置に挿入される。
【００２３】
上記溝遮光部材４の内枠３への挿入時、突部４ｃは、直進ガイド溝３ａに圧接した状態で挿入される。また、光軸Ｏ方向の配置状態では、バネリング６と溝遮光部材４は、回転枠１の前端面と、外枠２の内側に挿入されている円周遮光部材との間に非圧縮状態、あるいは、光軸Ｏ方向には僅かな隙間のある状態で挿入される。したがって、回転枠１が回転したとき、溝遮光部材４、および、円周遮光部材５が光軸Ｏ方向に接触して摺動抵抗が増えるといったことはない。
【００２４】
上記溝遮光部材４の内枠３挿入状態では、溝遮光部材４と接着状態にあるバネリング６のストッパ６が直進ガイド溝３ａに係合している。したがって、溝遮光部材４は、その突部４ｃも直進ガイド溝３ａから逸脱することなく、押圧状態を保ちながら、内枠３に対して相対回転することなく、内枠３に対して摺動する。但し、上記円周遮光部材５の方は、積極的に回転規制されない状態で進退移動する。
【００２５】
上述した構成を有する本実施形態のレンズ鏡筒９においては、回転枠１が回転駆動され、回転しながら進退駆動されると、外枠２は、固定枠に直進ガイドされた状態で回転枠１と共に光軸Ｏに沿って進退移動し、さらに、内枠３は、直進ガイド溝３ａに係合する外枠２のガイド突起２ａによって回転規制されながら回転枠１のカム溝１ｄにより光軸Ｏに沿って直進駆動される。外枠２と内枠３との摺動部の隙間は、上述したように嵌合円周部分を円周遮光部材５の内径部で遮光され、同時に直進ガイド溝係合部回りは、溝遮光部材４の突部４ｃによって確実に遮光される。
【００２６】
すなわち、円周遮光部材５と溝遮光部材４とが組み込まれた内枠３と外枠２においては、内枠３の外周円筒面３ｇと外枠２の内周円弧面２ｇとの円周嵌合隙間部は、円周遮光部材５の圧接によって遮光される。内枠３の直進ガイド溝３ａと外枠２のガイド突起２ａとの係合部回りの係合隙間は、後述するように溝遮光部材４の突部４ｃとその両サイド部を内枠３の直進ガイド溝３ａとその両サイド部に圧接させることによって遮光される。
【００２７】
ここで、内枠３の直進ガイド溝３ａと外枠２のガイド突起２ａとの略小半円形状の係合部周りの領域に関して、内枠３の内周円弧面３ｇと直進ガイド溝３ａとの両側の接続部分を円弧面からなる曲面領域Ｓ2 とＳ3 とする（図５（Ｂ））。そして、上記略小半円形状の係合部と上記曲面領域Ｓ2 とＳ3 とを含む領域を係合領域Ｓ1 とする。
【００２８】
上記曲面領域Ｓ2 とＳ3 を含む係合領域Ｓ1 に生じる隙間部は、溝遮光部材４の突部４ｃとその両サイド部が内枠３の直進ガイド溝３ａとその両サイド部に圧接することによって確実に遮光される（図５（Ｂ））。
【００２９】
本実施形態のレンズ鏡筒９は、上述したように内枠３を外枠２に対して直進ガイドするために従来のレンズ鏡筒のように内部に直進ガイド枠を必要とせず、上記直進ガイドのために外枠２と内枠３とそれぞれガイド突起２ａと、それに係合する直進ガイド溝３ａを設けた構造を有しており、コンパクト化が可能なものである。本実施形態のレンズ鏡筒９で問題となる複雑な形状をもつ直進ガイド機構部の遮光装置として、上述したように摺動する円周部に遮光用の円周遮光部材５と、直進ガイド溝部の遮光用の溝遮光部材４と別部材として組み込み、上記遮光部材５，４を必要以上の力で内枠，外枠３，２に圧接させることなく、確実な遮光を可能にしている。また、溝遮光部材４が内枠３に対して相対回転しないことから安定した遮光性が得られる。しかも、溝遮光部材４が人工皮革等の軟らかい材料で形成されているので、バネリング６の爪部６ｃによって押し出された溝遮光部材４の突部４ｃが内枠３の直進ガイド溝３ａの形状に倣って嵌り込み、確実な遮光が行われる。さらに、上述のように遮光部材の圧接力が小さいことからレンズ鏡筒の進退駆動負荷が増大することがない。
【００３０】
なお、上記第１の実施形態のレンズ鏡筒９における内枠３は、合成樹脂、または、金属材料による射出成形，ダイカスト成形等により製作される形状を有するが、内枠３は、上記製作形状に限らず金属板をプレス成形によって製作した枠部材を適用することも可能である。
【００３１】
次に、本発明の第２の実施形態の遮光構造を有するレンズ鏡筒について図６〜８を用いて説明する。
図６は、本実施形態の遮光構造を有するレンズ鏡筒の分解斜視図である。図７は、上記レンズ鏡筒の遮光部回りの断面形状を示す図６のＥ−Ｅ断面部分の断面図である、図８は、図７のＦ−Ｆ断面図である。
【００３２】
本実施形態のレンズ鏡筒１０は、図６に示すように主に固定枠（図示せず）と、固定枠に回転自在に支持される回転枠１１と、固定枠に対して直進進退可能にガイドされ、回転枠１１の外周部に相対回転可能に嵌入される第１の枠である外枠１２と、外枠１２の内周部に進退自在に嵌入する第２の枠である内枠１３と、内枠１３の外周部に摺動自在に嵌入する遮光部材１４とを有してなる。
【００３３】
上記回転枠１１は、円環部材であって、回転枠１１の後方リング部１１ｂの外周に沿ってヘリコイド雄ねじと平歯車部とが重畳して配置されている。また、上記後方リング部１１ｂの前方の外周に沿って外周溝１１ｃが配置されている。さらに、回転枠１１の内周には、内枠１３を進退駆動するための３本のカム溝１１ｄが配置されている。
【００３４】
上記回転枠１１のヘリコイド雄ねじと平歯車部は、固定枠（図示せず）側のヘリコイド雌ねじおよび長尺ギヤに螺合、または、噛合しており、回転枠１１は、長尺ギヤにより回転駆動されると、上記ヘリコイド雌ねじによって回転進退駆動される。
【００３５】
上記外枠１２は、同様に円環部材であって、外枠１２の前端面の内方側に位置する内方フランジ部１２ｆを有している。その内方フランジ部１２ｆの内周には、内側に突出する略小半円形状の６つのガイド突起（直進ガイド部）１２ａ、および、上記ガイド突起１２ａの間に配される６つの内周円弧面１２ｇが略等間隔に配置される。さらに、内方フランジ部１２ｆの後方内周部には、内周方向で各ガイド突起１２ａと同一配設角度方向位置であって、各ガイド突起１２aよりも凸量の少ない６つの略小半円形状（先端）の突起部１２ｈが配置されている（図８）。なお、上記内周円弧面１２ｇの円弧中心は、撮影レンズの光軸Ｏ、または、外枠１２の中心とするが、それ以外の光軸Ｏと平行な軸心とすることも可能である。
【００３６】
上記外枠１２の外周後端側のピン穴１２ｅにはピン１５が固着されている。上記ピン１５の外径側に突出する部が固定枠の直進ガイド溝（図示せず）に摺動自在に嵌入するガイドピン部となり、ピン１５の外枠１２の内周面側に突出する部分が回転枠１１の外周溝１１ｃに摺動自在に嵌入するガイドピン部となる。したがって、外枠１２は、固定枠により回転規制された状態で、かつ、回転枠１１の光軸Ｏ方向の移動と一体で光軸Ｏに沿って進退駆動される。
【００３７】
上記内枠１３は、同様に円環状部材であって、光軸Ｏに沿った略小半円溝形状の６本の直進ガイド溝（係合部）１３ａと、上記直進ガイド溝１３ａの間を結ぶ６つの円弧部からなる外周円筒面１３ｇとを有し、さらに、外周後端部の穴部１３ｅにカムフォロア１６が固着されている。上記内枠１３の直進ガイド溝１３ａと、外枠１２のガイド突起１２ａとは、係合可能な円周上の位置に配置されている。また、遮光部材１４を密着し易くするために上記直進ガイド溝１３ａと外周円筒面１３ｇとの接続部分は、円弧面で接続されている。
【００３８】
そして、上記内枠１３は、外枠１２に対して外枠１２の内周円弧面１２ｇに外周円筒面１３ｇを嵌入させ、かつ、外枠１２のガイド突起１２ａに内枠１３の直進ガイド溝１３ａを回転規制状態で係合させて組み付けられる。したがって、内枠１３は、外枠１２に対して進退可能状態で支持される。なお、内枠１３の内周部には、撮影レンズを保持するレンズ枠（図示せず）等が内蔵される。
【００３９】
上記遮光部材１４は、弾性変形可能なシリコンゴム等の材料で形成され、内周面に複数の突部を有するリング形状の部材である。この遮光部材１４は、内周部に第１の遮光部としての６つの略小半円形状の突部（凸部）１４ａと、その突部１４ａの間を結ぶ面であって、第２の遮光部としての６つの内周円弧面１４ｇとを有している。なお、遮光部材１４の取り付け前の状態では、上記突部１４ａの内接円径は、内枠１３の直進ガイド溝１３ａの谷部の内接円径より僅かに小さく、圧接可能となっている。また、上記内周円弧面１４ｇの径は、内枠１３の外周円筒面１３ｇより僅かに小さく、圧入可能となっている。
【００４０】
上記遮光部材１４は、図７，８に示すように内枠１３の直進ガイド溝１３ａに突部１４ａを圧接係合させ、かつ、外周円筒面１３ｇに内周円弧面１４ｇを圧入嵌合させて内枠１３に挿入する。同時に、上記遮光部材１４は、内枠１３に嵌合している外枠１２の内方フランジ部１２ｆの内側と回転枠１１との間に位置するように嵌合挿入される。その挿入状態で遮光部材１４の突部１４ａの外方対向位置が外枠１２の突起部１２ｈで内方向に押圧された状態となる（図８）。したがって、遮光部材１４は、その突部１４ａが内枠１３の直進ガイド溝１３ａに確実に圧接された状態で内枠１３により回転規制され、回転枠１１および外枠１２とともに進退移動する。同時に進退移動時、突部１４ａが直進ガイド溝１３ａから外れることが確実に防止される。
【００４１】
なお、遮光部材１４の光軸Ｏ方向の配置について、遮光部材１４は、回転枠１１の前端面と、外枠１２のフランジ面１２ｆ内面とで押圧されない状態、あるいは、僅かな隙間のある状態で組み込まれているので、回転枠１１の回転動作時に遮光部材１４が光軸Ｏ方向で接触して摺動抵抗が増えるようなことはない。
【００４２】
上述した構成を有する本実施形態のレンズ鏡筒１０においては、回転枠１１が回転駆動され、回転しながら進退駆動されると、外枠１２は、固定枠に直進ガイドされた状態で回転枠１１と共に光軸Ｏに沿って進退移動し、さらに、内枠１３は、直進ガイド溝１３ａに係合する外枠２のガイド突起１２ａによって回転規制されながら回転枠１１のカム溝１１ｄにより光軸Ｏに沿って直進駆動される。そして、外枠１２と内枠１３との形状が複雑な摺動嵌合部の隙間は、上述したように遮光部材１４によって遮光される。
【００４３】
すなわち、遮光部材１４が組み込まれた内枠１３と外枠１２においては、内枠１３の外周円筒面１３ｇと、外枠１２の内周円弧面１２ｇとの円周嵌合隙間部は、遮光部材１４の内周円弧面１４ｇが内枠１３の外周円筒面１３ｇに圧接することよって遮光される。また、内枠１３の直進ガイド溝１３ａと外枠１２のガイド突起１２ａとの係合部回りの係合隙間は、遮光部材１４の突部１４ｃとその両サイド部を内枠１３の直進ガイド溝１３ａおよびその両サイド部に圧接させることによって遮光される。
【００４４】
本実施形態のレンズ鏡筒１０も上述したように内枠１３を外枠１２に対して直進ガイドするために従来のレンズ鏡筒のように内部に直進ガイド枠を必要とせず、上記直進ガイドのために外枠１２と内枠１３とにそれぞれガイド突起１２ａと、それに係合する直進ガイド溝１３ａを設けた構造を有しており、コンパクト化可能なものである。
【００４５】
本実施形態のレンズ鏡筒１０で問題となる内枠１３と外枠１２との複雑な形状の直進ガイド機構部の遮光装置として特に本実施形態の場合、上述したように摺動する１つの遮光部材１４を組み込み、その突部１４ａおよびその両サイド部で上記直進ガイド溝１３ａおよびその両サイド部との確実な遮光が行われる。また、遮光部材１４が内枠１３に対して相対回転しないことから安定した遮光状態が得られる。また、遮光部材として単一の遮光部材１４を適用するのでレンズ鏡筒の光軸Ｏ方向の長さが短くでき、また、遮光装置の部品点数を減らすことができ、同時に組み立て性も向上する。
【００４６】
なお、上記第２の実施形態のレンズ鏡筒１０における外枠１２，内枠１３は、合成樹脂、または、金属材料による射出成形，ダイカスト成形等により製作される形状を有するが、外枠１２，内枠１３は、上記製作形状に限らず金属板をプレス成形した枠部材とすることも可能である。
【００４７】
上記外枠に金属板でプレス成形した枠部材を適用した場合のレンズ鏡筒の変形例の１つとして図９，１０および図１１（Ａ），（Ｂ）に示すものを提案することができる。
この変形例のレンズ鏡筒は、前記第２の実施形態のレンズ鏡筒１０に対して外枠が金属板で形成され、前記実施形態における外枠１２の前端側内周部に設けられた突起部１２ｈに代えて金属板製の締め付け部材を付加した点が異なる。それ以外の構成は、前記第２の実施形態のレンズ鏡筒１０の場合と同様に回転枠１１，内枠１３，遮光部材１４等を適用する。以下、異なる部分について説明する。
【００４８】
なお、図９は、本変形例のレンズ鏡筒の遮光部回りの断面形状を示す。図１０は、図９のＧ−Ｇ断面部分の断面図である、図１１（Ａ），（Ｂ）は、本変形例のレンズ鏡筒の内枠に外力が作用して、内枠が上方に変位したときの遮光部の状態を示す光軸Ｏと直交断面での断面図であり、図１１（Ａ）は、レンズ鏡筒の上方部分を示し、図１１（Ｂ）は、レンズ鏡筒の下方部分を示す。
【００４９】
本変形例のレンズ鏡筒における外枠１８は、金属板製の円環部材であって、図９に示すように外枠１８の前端面の内方に延びる内方フランジ部１８ｆを有している。その他、上記外枠１８には、前記外枠１２と同様に内方フランジ部１８ｆにガイド突起１８ａが設けられ、さらに、内周円弧面やピンが同様に配置されている。そして、外枠１８の内方フランジ部１８ｆの内側であって、回転枠１１の前端面との間の隙間に、金属板製の締め付け部材１９が挿入される。
【００５０】
上記締め付け部材１９は、光軸Ｏ方向の幅が遮光部材１４の幅より僅かに広い略リング状の１つの板バネ部材であって、円周上６箇所に内側への突起部１９ｈが設けられる。この締め付け部材１９の外周部は、外枠１８の内周部に挿入される。
【００５１】
上記突起部１９ｈは、外枠１８への組み込み状態でガイド突起１８ａよりも凸量が少なく、ガイド突起１８aの後方に円周方向で同一配設角度方向位置に配置される。その突起部１９ｈは、組み込まれた遮光部材１４の突部１４ａの外周部分を押圧する。したがって、遮光部材１４の突部１４ａが内枠１３の直進ガイド溝１３ａに密着し、かつ、外れないように押圧される。
【００５２】
本変形例のレンズ鏡筒において、内枠１３に外力が作用し、外枠１８に対して相対的に上方に変位した場合の係合状態について説明する。なお、図１１（Ａ），（Ｂ）では、内枠１３の変位前の状態を２点鎖線で示し、変位後の内枠１３が上方に相対変位した状態を実線で示している。
【００５３】
外枠１８と内枠１３の中心軸が相対的に上方にずれた場合、ずれた方向の締付け部材１９の突起部１９ｈは、内枠１３が移動したことによって内枠１３の直進ガイド溝１３ａに遮光部材１４を介して中心軸がずれる前より強い力で押さえられる。そして、締付け部材１９は、円周方向に移動可能なため、内枠１３の変位により上方に位置する突起部１９ｈは、突起部１９ｉの形状に変化する。締付け部材１９の突起部１９ｉの円弧の径の大きさが大きく変形することにより、半径方向の力から円周方向の力に変換され、円周方向に伝わる。その力の一部は、ずれた方向の締付け部材１９の突起部１９ｉの反対側の突起部１９ｊで半径方向の力に変換され、遮光部材１４を介して内枠１３の直進ガイド溝１３ａを押圧する。したがって、直進ガイド溝１３ａと遮光部材１４との押さえ付ける力の増大および減少の変化が少なくなるように自動調節される。このようにして、外枠１８と内枠１３との中心軸が相対的にずれるような場合においても、遮光部材１４と内枠１３との当接状態が確実に保たれる。
【００５４】
本変形例のレンズ鏡筒によれば、外枠１２と遮光部材１４の間に締付け部材１９を設け、締付け部材１９の突起部１９ｈにより遮光部材１４の突部１４ａが押圧されるので、内枠１３の直進ガイド溝１３ａの周辺が確実に押さえ付けられる。したがって、形状が複雑な外枠１８のガイド突起１８ａと内枠１３の直進ガイド溝１３ａの係合部の遮光を確実に行うことができる。
【００５５】
また、内枠１３と外枠１８の中心軸が外力（予期せぬ力）でずれた場合でも締付け部材１９が変形することによって、中心軸のずれによる内枠１３の直進ガイド溝１３ａと遮光部材１４の押さえ付ける力の増大および減少の変化を小さく抑えることができ、外枠１８と内枠１３との直進ガイド係合部の遮光を安定して行うことができる。
【００５６】
次に、本発明の第３の実施形態の遮光構造を有するレンズ鏡筒について図１２〜１４を用いて説明する。
図１２は、本実施形態の遮光構造を有するレンズ鏡筒の分解斜視図である。図１３は、上記レンズ鏡筒の遮光部回りの断面形状を示す図１２のＨ−Ｈ断面部分の断面図である。図１４は、図１３のＩ−Ｉ断面図である。
【００５７】
本実施形態のレンズ鏡筒２０は、図１２に示すように主に固定枠（図示せず）と、固定枠に回転自在に支持される回転枠２１と、固定枠に対して直進進退可能にガイドされ、回転枠２１の外周部に相対回転可能に嵌入される第１の枠の外枠２２と、外枠２２の内周部に進退自在に嵌入する第２の枠の内枠２３と、内枠２３の外周部に摺動自在に嵌入する遮光部材２４とを有してなる。
【００５８】
上記回転枠２１は、円環部材であって、回転枠２１の後方リング部２１ｂの外周に沿ってヘリコイド雄ねじと平歯車部とが重畳して配置されている。また、上記後方リング部２１ｂの前方の外周に沿って外周溝２１ｃが配置されている。さらに、回転枠２１の内周には、内枠２３を進退駆動するための３本のカム溝２１ｄが配置されている。
【００５９】
上記回転枠２１のヘリコイド雄ねじと平歯車部は、固定枠（図示せず）側のヘリコイド雌ねじおよび長尺ギヤに螺合、または、噛合しており、回転枠２１は、長尺ギヤにより回転駆動されると、上記ヘリコイド雌ねじによって回転進退駆動される。
【００６０】
上記外枠２２は、同様に円環部材であって、外枠２２の前端面の内方側に位置する内方フランジ部２２ｆを有している。その内方フランジ部２２ｆの内周には、内側に突出する略小半円凹形状の６つのガイド凹部（直進ガイド部）２２ａ、および、上記ガイド凹部２２ａの間に配される６つの内周円弧面２２ｇが略等間隔に配置される。さらに、内方フランジ部２２ｆの後方には、各ガイド凹部２２ａを円周方向で挟むように２つずつ、計１２箇所に略小半円形状（先端）の突起部２２ｈが配置されている。
なお、上記内周円弧面２２ｇの円弧中心は、光軸Ｏ、または、外枠２２の中心軸とするが、それ以外の光軸Ｏと平行な軸心であってもよい。
【００６１】
さらに、外枠２２の外周後端側のピン穴２２ｅにはピン２５が固着されている。上記ピン２５の外径側に突出する部が固定枠の直進ガイド溝（図示せず）に摺動自在に嵌入するガイドピン部となり、ピン２５の外枠２２の内周面側に突出する部分が回転枠２１の外周溝２１ｃに摺動自在に嵌入するガイドピン部となる。したがって、外枠２２は、固定枠により回転規制された状態で、かつ、回転枠２１の光軸Ｏ方向の移動と一体の状態で光軸Ｏに沿って進退駆動される。
【００６２】
上記内枠２３は、同様に円環状部材であって、光軸Ｏに沿った略小半円形凸断面の６本の突条（係合部）２３ａと、上記突条２３ａの間を結ぶ６つの円弧部からなる外周円筒面２３ｇとが配置される。さらに、外周後端部の穴部２３ｅにカムフォロア２６が固着されている。上記内枠２３の突条２３ａと、外枠２２のガイド凹部２２ａとは、係合可能な円周上の位置に配置されている。また、遮光部材２４を密着し易くするために上記突条２３ａと外周円筒面２３ｇとの接続部分は、円弧面で接続されている。
【００６３】
そして、上記内枠２３は、外枠２２に対して外枠２２の内周円弧面２２ｇに外周円筒面２３ｇが嵌入し、かつ、内枠２３の突条２３ａに外枠２２のガイド凹部２２ａが回転規制状態で係合して組み付けられ、進退可能状態で支持される。なお、内枠２３の内周部には、撮影レンズを保持するレンズ枠（図示せず）等が内蔵される。
【００６４】
上記遮光部材２４は、弾性変形可能なシリコンゴム等の材料で形成され、内周面に複数の凹部を有するリング形状の部材である。この遮光部材２４は、内周部に第１の遮光部としての６つの略小半円状切り欠きである凹部２４ａと、その凹部２４ａの間を結ぶ面であって、第２の遮光部としての６つの内周円弧面２４ｇとを有している。なお、遮光部材２４の取り付け前の状態では、上記凹部２４ａの外接円径は、内枠２３の突条２３ａの外接円径より僅かに小さく、圧接可能となっている。また、上記内周円弧面２４ｇの径は、内枠２３の外周円筒面２３ｇより僅かに小さく、圧入可能となっている。
【００６５】
上記遮光部材２４は、図１３，１４に示すように内枠２３の突条２３ａに凹部を圧接係合させ、かつ、内周円弧面２４ｇを外周円筒面２３ｇに圧入嵌合させて内枠２３に挿入する。さらに、上記遮光部材２４は、外枠２２の内方フランジ部２２ｆの内側に挿入される。その挿入状態で遮光部材２４の外周面の各凹部２４ａの両サイド部が外枠２２の各２つの突起部２２ｈで内方向に押圧された状態となる（図１４）。したがって、遮光部材２４の凹部２４ａは、上記各２つの突起部２２ｈで押さえ込まれ、内枠２３の突条２３ａに確実に密着し、進退移動中の外れも防止される。
【００６６】
上述のように組み込まれた遮光部材２４は、その凹部２４ａが内枠２３の突条２３ａに圧接された状態で内枠１３で回転規制され、かつ、回転枠２１および外枠２２とともに進退移動する。なお、遮光部材２４の光軸Ｏ方向の配置に関しては、遮光部材２４が回転枠２１の前端面と、外枠２２のフランジ面２２ｆ内面とで押圧されない状態、あるいは、僅かな隙間のある状態で組み込まれるので、回転枠２１の回転時に遮光部材２４が光軸Ｏ方向で接触して摺動抵抗が増えるといったことはない。
【００６７】
上述した構成を有する本実施形態のレンズ鏡筒２０においては、回転枠２１が回転駆動され、回転しながら進退駆動されると、外枠２２は、固定枠に直進ガイドされた状態で回転枠２１と共に光軸Ｏに沿って進退移動し、さらに、内枠２３は、突条２３ａに係合する外枠２のガイド凹部２２ａによって回転規制されながら回転枠２１のカム溝２１ｄにより光軸Ｏに沿って直進駆動される。外枠２２と内枠２３との摺動嵌合部の隙間は、上述したように遮光部材２４によって遮光される。
【００６８】
すなわち、遮光部材２４が組み込まれた内枠２３と外枠２２においては、内枠２３の外周円筒面２３ｇと外枠２２の内周円弧面２２ｇとの円周嵌合隙間部は、遮光部材２４の内周円弧面２４ｇが内枠２３の外周円筒面２３ｇに圧接することよって遮光される。また、内枠２３の突条２３ａと外枠２のガイド凹部２２ａとの係合部回りの係合隙間は、遮光部材２４の凹部２４ａとその両サイド部を内枠２３の突条２３ａおよびその両サイド部に圧接させることによって遮光される。なお、上記遮光部材２４は、内枠２３に対して内枠２３の突条で回転が規制されて光軸Ｏ方向にのみ相対移動する。
【００６９】
本実施形態のレンズ鏡筒２０も上述したように内枠２３を外枠２２に対して直進ガイドするために従来のレンズ鏡筒のように内部に直進ガイド枠を必要とせず、上記直進ガイドのために外枠２２と内枠２３とにそれぞれガイド凹部２２ａと、それに係合する突条２３ａを設ける構造を有しており、コンパクト化が可能なものである。
【００７０】
本実施形態のレンズ鏡筒２０で問題となる内枠２３と外枠２２との複雑な形状の直進ガイド機構部の遮光装置に関して、特に本実施形態の場合、上述したように摺動する単一の遮光部材２４を組み込み、各凹部２４ａとその両サイド部で内枠２３の上記突条２３ａとその両サイド部を外側から２つの突起部２２ｈにより押圧して効率よく密着させることで確実な遮光を可能としている。同時に遮光部材２４の内周円弧面２４ｇで内枠２３の外周円弧部２３ａの遮光が行われる。そして、遮光部材２４が内枠２３に対して相対回転することがないので遮光状態が安定する。さらに、遮光部材として単一の遮光部材２４のみを使用することから光軸Ｏ方向の占有エリアが少なく、レンズ鏡筒のコンパクト化が可能となり、しかも、遮光装置の部品点数を減らすことができ、同時に組み立て性も向上する。
【００７１】
なお、上記第３の実施形態のレンズ鏡筒２０における外枠２２，内枠２３は、合成樹脂、または、金属材料による射出成形，ダイカスト成形等により製作される形状を有するが、上記外枠２２，内枠２３は、上記製作形状に限らず金属板をプレス成形した枠部材とすることも可能である。
【００７２】
上記外枠２２を金属板でプレス成形した枠部材を適用した場合のレンズ鏡筒の変形例の１つとして図１５，１６と図１７（Ａ），（Ｂ）に示すものを提案することができる。
【００７３】
本変形例のレンズ鏡筒は、前記第３の実施形態のレンズ鏡筒２０に対して外枠が金属板で形成され、前記実施形態における外枠２２の前端側内周部に設けられた突起部２２ｈに代えて金属板製の締め付け部材を組み込む点が異なる。それ以外の構成は、前記第３の実施形態のレンズ鏡筒２０の場合と同様に回転枠２１，内枠２３，遮光部材２４等を適用する。以下、異なる部分について説明する。
【００７４】
なお、図１５は、本変形例のレンズ鏡筒の遮光部回りの断面形状を示す。図１６は、図１５のＪ−Ｊ断面部分の断面図である、図１７（Ａ），（Ｂ）は、本変形例のレンズ鏡筒の内枠に外力が作用して、内枠が上方に変位したときの遮光部の状態を示す光軸Ｏと直交断面での断面図である。図１７（Ａ）は、上記レンズ鏡筒の上方部分を示し、図１７（Ｂ）は、上記レンズ鏡筒の下方部分を示す。
【００７５】
本変形例のレンズ鏡筒における外枠２８は、金属板製の円環部材であって、図１５に示すように外枠２８の前端面の内方に延びる内方フランジ部２８ｆを有している。その他、上記外枠２８には、内方フランジ部２８ｆにガイド凹部２８ａが設けられ、さらに、前記外枠２２と同様に内周円弧面やピンが同様に配置されている。
【００７６】
そして、外枠２８の内方フランジ部２８ｆの内側であって、回転枠２１の前端面との間の隙間に、金属板製の締め付け部材２９が挿入される。
【００７７】
上記締め付け部材２９は、光軸Ｏ方向の幅が遮光部材１４の幅より僅かに広い略リング状の１つの板バネ部材であって、円周上２つずつ計１２箇所に内側への突起部２９ｈが設けられる。この締め付け部材２９の外周部は、外枠２２の内側に挿入される。
【００７８】
上記突起部２９ｈは、外枠２８への組み込み状態で各ガイド凹部２８ａに対応して円周上の配設位置方向に跨いだ対の状態で配置される。そして、径方向に弾性変形した状態で遮光部材２４の各凹部２３ａに対向する外径側の２箇所を押圧する。したがって、遮光部材２４の凹部２４ａが内枠２３の突条２３ａに密着しかつ、外れないように押圧された状態に保たれる。
【００７９】
本変形例のレンズ鏡筒において、内枠２３に外力が作用し、外枠２８に対して相対的に上方に変位した場合の係合状態について説明する。なお、図１７（Ａ），（Ｂ）では、内枠２３の変位前の状態を２点鎖線で示し、変位後の内枠２３が上方に相対変位した状態を実線で示している。
【００８０】
上述のように内枠２３と外枠２８との中心軸が相対的に上下にずれた場合、ずれた方向の締付け部材２９の突起部２９ｈは、内枠２３が移動したことによって内枠２３の突条２３ａに遮光部材２４を介して中心軸がずれる前より強い力で押さえられる。そして、締付け部材２９は、円周方向に移動可能なため、内枠２３の変位により突起部２９ｈは、突起部２９ｉの形状に変化する（図１７（Ａ））。締付け部材２９の突起部２９ｉの円弧の径の大きさが大きく変形することにより、半径方向の力から円周方向の力に変換され、円周方向に伝わる。その力の一部は、ずれた方向の締付け部材２９の突起部２９ｉの反対側の突起部２９ｊで半径方向の力に変換され、遮光部材２４を介して内枠２３の突条２３ａを押す力に付加される。
【００８１】
本変形例のレンズ鏡筒によれば、外枠２２と遮光部材２４の間に締付け部材２９を設けることで締付け部材２９の各２つの突起部２９ｈで遮光部材２４の各凹部２４ａの両サイドを外方から押圧する。その押圧により上記凹部２４ａを内枠２３の突条２３ａの周辺に確実に押さえ付け、形状が複雑な外枠２８のガイド凹部２８ａと内枠２３の突条２３ａの遮光を安定して行うことができる。
【００８２】
また、内枠２３と外枠２８の中心軸が外力（予期せぬ力）でずれた場合でも締付け部材２９が変形することによって、中心軸のずれによる内枠２３の突条２３ａと遮光部材２４の押さえ力の増大および減少の変化を抑え、外枠２８と内枠１３の直進ガイドのための係合部の遮光を安定して行うことができる。
【００８３】
本発明により以下の構成を提案することができる。すなわち、
（付記１） 光軸方向の一端部に内側に向けて突出する直進ガイド部が形成された第１の枠と、
上記第１の枠の内側に配され、上記直進ガイド部と係合可能であって光軸方向に延出する溝部が形成された、上記第１の枠に対し光軸方向に相対的に移動可能な第２の枠と、
上記第１の枠と第２の枠との間に配され、上記第１の枠と第２の枠との間を光密に保つための遮光部材と、
上記遮光部材と上記第１の枠との間に配され、上記遮光部材を上記第２の枠に対して当接するように押圧する押圧部材と、
を具備し、上記押圧部材は、上記第２の枠の円周方向で、上記溝部に対応する位置にて上記遮光部材を押圧することを特徴とするレンズ鏡筒の遮光装置。
【００８４】
（付記２） 上記遮光部材は、上記溝部と係合可能な凸部と、上記第２の枠の外周に対して形成された円弧部とからなることを特徴とする付記１に記載のレンズ鏡筒の遮光装置。
【００８５】
（付記３） 光軸方向の一端部に内側に向けて突出する直進ガイド部が形成された第１の枠と、
上記第１の枠の内側に配され、上記直進ガイド部と係合可能であって光軸方向に延出する溝部が形成された、上記第１の枠に対して光軸方向に相対的に移動可能な第２の枠と、
上記第１の枠と第２の枠との間に配され、上記第１の枠と第２の枠との間を光密に保つための遮光部材と、
上記第１の枠の内周面上にあって、円周方向で上記溝部に対応する位置に形成された押圧部とを具備し、
上記押圧部は、上記遮光部材が上記第２の枠に当接するように上記遮光部材を押圧することを特徴とするレンズ鏡筒の遮光装置。
【００８６】
（付記４） 上記遮光部材は、上記溝部と係合可能な凸部と、上記第２の枠の外周に対応して形成された円弧部とからなることを特徴とする付記３に記載のレンズ鏡筒の遮光装置。
【００８７】
（付記５） 光軸方向の一端部の内側に穿設された凹部からなる直進ガイド部が形成された第１の枠と、
上記第１の枠の内側に配され、上記直進ガイド部と係合可能であって光軸方向に延出する突条が形成された、上記第１の枠に対し光軸方向に相対的に移動可能な第２の枠と、
上記第１の枠と第２の枠との間に配され、上記第１の枠と第２の枠との間を光密に保つための遮光部材と、
上記遮光部材と上記第１の枠との間に配され、上記遮光部材を上記第２の枠に対して当接するように押圧する押圧部材と、
を具備し、上記押圧部材は、上記第２の枠の円周方向で、上記突条の両側に対応する位置にて上記遮光部材を押圧することを特徴とするレンズ鏡筒の遮光装置。
【００８８】
（付記６） 上記遮光部材は、上記突条と係合可能な凹部と、上記第２の枠の外周に対応して形成された円弧部とからなることを特徴とする付記５に記載のレンズ鏡筒の遮光装置。
【００８９】
（付記７） 光軸方向の一端部の内周側に穿設された凹部からなる直進ガイド部が形成された第１の枠と、
上記第１の枠の内側に配され、上記直進ガイド部と係合可能であって光軸方向に延出する突条が形成された、上記第１の枠に対し光軸方向に相対的に移動可能な第２の枠と、
上記第１の枠と第２の枠との間に配され、上記第１の枠と第２の枠との間を光密に保つための遮光部材と、
上記第１の枠の内周面上であって、円周方向で上記突条の両側に対応する位置に形成された押圧部と、
を具備し、上記押圧部は、上記遮光部材が上記第２の枠に当接するように上記遮光部材を押圧することを特徴とするレンズ鏡筒の遮光装置。
【００９０】
（付記８） 上記遮光部材は、上記突条と係合可能な凹部と、上記第２の枠の外周に対応して形成された円弧部とからなることを特徴とする付記７に記載のレンズ鏡筒の遮光装置。
【００９１】
【発明の効果】
本発明によると、第１の枠に対して相対的に進退移動可能に支持される第２の枠と上記第１の枠の嵌合隙間の遮光を遮光部材より行う装置であって、上記嵌合隙間の安定した遮光が行え、しかも、上記遮光部材による枠部材への締め付け力を減じることでレンズ鏡筒の進退駆動負荷の増加が抑えられ、さらに、レンズ鏡筒のコンパクト化も可能なレンズ鏡筒の遮光装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態の遮光構造を有するレンズ鏡筒の分解斜視図である。
【図２】上記図１のレンズ鏡筒の縦断面図であり、上半部がズームワイド状態、下半部がズームテレ状態を示す。
【図３】上記図１のレンズ鏡筒の遮光部回りの断面を示す図１のＡ−Ａ断面図である。
【図４】上記図１のレンズ鏡筒の遮光部回りの断面を示す図１のＢ−Ｂ断面図である。
【図５】上記図１のレンズ鏡筒における円周遮光部材部分、または、溝遮光部材部分の光軸直交断面を示す図であって、図５（Ａ）は、図３のＣ−Ｃ断面図であり、図５（Ｂ）は、図３のＤ−Ｄ断面図である。
【図６】本発明の第２の実施形態の遮光構造を有するレンズ鏡筒の分解斜視図である。
【図７】上記図６のレンズ鏡筒の遮光部回りの断面形状を示す図６のＥ−Ｅ断面図である。
【図８】上記図７のＦ−Ｆ断面図である。
【図９】上記図６のレンズ鏡筒の変形例における遮光部回りの断面形状を示す。
【図１０】上記図９のＧ−Ｇ断面部分の断面図である。
【図１１】上記図９の変形例のレンズ鏡筒にて内枠に外力が作用して、内枠が上方に変位したときの遮光部の状態を示す光軸と直交断面での断面図であり、図１１（Ａ）は、レンズ鏡筒の上方部分を示し、図１１（Ｂ）は、レンズ鏡筒の下方部分を示す。
【図１２】本発明の第３の実施形態の遮光構造を有するレンズ鏡筒の分解斜視図である。。
【図１３】上記図１２のレンズ鏡筒の遮光部回りの断面形状を示す図１２のＨ−Ｈ断面部分の断面図である。
【図１４】上記図１３のＧ−Ｇ断面図である。
【図１５】上記図１２のレンズ鏡筒の変形例における遮光部回りの断面形状を示す。
【図１６】図１６は、図１５のＪ−Ｊ断面部分の断面図である、。
【図１７】上記図１５の変形例のレンズ鏡筒において、内枠に外力が作用して、内枠が上方に変位したときの遮光部の状態を示す光軸と直交断面での断面図であり、図１７（Ａ）は、レンズ鏡筒の上方部分を示し、図１７（Ｂ）は、レンズ鏡筒の下方部分を示す。
【符号の説明】
２，１２，１８，２２，２９…外枠（第１の枠）
２ａ，１２ａ…ガイド突起（突起，直進ガイド部）
３，１３，２３…内枠（第２の枠）
３ａ，１３ａ…直進ガイド溝（係合部，溝）
３g，１３g，２３g…外周円筒面（円弧部）
４ …溝遮光部材（遮光部材）
４ｃ，１４ａ…突部（第１の遮光部，遮光部材）
５ …円周遮光部材（第２の遮光部，遮光部材）
１４，２４…遮光部材
１４ｇ，２４ｇ…内周円弧面（第２の遮光部）
２２ａ，２８ａ…ガイド凹部（直進ガイド部，凹部）
２３ａ…突条（係合部）
２４ａ…凹部（第１の遮光部）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a light shielding device between frames in a lens barrel.
[0002]
[Prior art]
Conventionally disclosed in Japanese Patent Laid-Open No. 2000-66078, which has been proposed regarding the structure of a lens barrel having a frame member that relatively rotates and moves relatively straight, a linear guide for relatively moving the frame member relatively straight. Is employed in the lens barrel.
[0003]
In the lens barrel having the above configuration, since the linear guide is provided inside the frame, the radial size of the entire lens barrel is increased by the occupied area of the linear guide member, and it is difficult to make the lens barrel compact. It was.
[0004]
Therefore, as a lens barrel that can be made compact and reduce the number of component parts, without using the straight guide member, a straight guide groove for a straight guide is provided on the outer peripheral surface of the inner frame member, and guide projections on the outer frame member are provided. A lens barrel that can be slidably fitted into the linear guide groove to guide the inner frame member linearly is conceivable.
[0005]
[Problems to be solved by the invention]
In the above-described lens barrel in which the linear guide groove is provided in the inner frame member, it is necessary to shield the gap including the outer frame member that slides and the linear guide mechanism of the inner frame member. An uneven portion is formed around the straight guide groove between the outer frame member and the inner frame member, and the uneven portion needs to be shielded from light with a low sliding resistance. For example, if a light-shielding member such as a rubber ring that can be elastically deformed is fitted into the recess, a large tightening force is required to press the rubber ring, and the lens barrel moves forward and backward by the tightening force. May increase. In addition, even when an external force is applied to the lens barrel, there is a problem that the light shielding state at the concavo-convex portion for the straight guide provided between the outer frame member and the inner frame member must be stably maintained.
[0006]
  The present invention has been made in order to solve the above-described problem, and reliably shields light in the gap between the linear guide portions between the frame members, and further allows the lens barrel to be made compact.apparatusThe purpose is to provide.
[0007]
[Means for Solving the Problems]
  Of the present inventionFirstThe light blocking device for the lens barrel includes a first frame, a second frame that is disposed inside the first frame, is movable relative to the first frame in an optical axis direction, and the first frame. A rectilinear guide portion formed on the inner peripheral side of one frame, an engaging portion formed on the outer peripheral side of the second frame and engaged with the rectilinear guide portion, the first frame and the second frame A light-shielding member disposed between the first frame and the second frame, wherein the engaging portion has a substantially small semicircular cross-sectional shape. The light shielding member includes a first light shielding portion that engages with an engagement portion of the second frame, and a second light shielding portion that abuts on an arc portion of the second frame.The
  The rectilinear guide portion includes a protrusion that protrudes toward the inside of the first frame, the engagement portion includes a groove that can be engaged with the protrusion, and the first light shielding portion is formed in the groove. The second light-shielding portion is engaged with the second frame while being pressed against the arc portion of the second frame in a non-pressed state.
[0008]
  Of the present inventionSecondThe lens barrel shading deviceA first frame, a second frame disposed inside the first frame and movable relative to the first frame in the optical axis direction; and an inner peripheral side of the first frame. Formed between the formed rectilinear guide part, the engaging part that is formed on the outer peripheral side of the second frame and engages with the rectilinear guide part, and the first frame and the second frame; A light shielding member for keeping light tightness between the first frame and the second frame, wherein the engaging portion has a substantially small semicircular cross-sectional shape, and the light shielding member includes the first light shielding member. A first light-shielding portion that engages with the engagement portion of the second frame, and a second light-shielding portion that contacts the arc portion of the second frame,
The rectilinear guide portion includes a recess formed inside the first frame, the engagement portion includes a protrusion that can be engaged with the recess, and the first light shielding portion includes the protrusion. The second light-shielding portion is in contact with the arc portion of the second frame in a pressed state.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a lens barrel having a light shielding structure according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the lens barrel, in which the upper half shows a zoom wide state and the lower half shows a zoom telephoto state. 3 and 4 show a cross section of the lens barrel around the light shielding portion, FIG. 3 is a cross sectional view of the AA cross section of FIG. 1, and FIG. 4 is a cross section of the BB cross section of FIG. It is sectional drawing. 5 (A) and 5 (B) are views showing a cross section orthogonal to the optical axis of the circumferential light shielding member portion or the groove light shielding member portion, and FIG. 5 (A) is a cross-sectional view taken along the line CC in FIG. FIG. 5B is a cross-sectional view taken along the line DD of FIG. 3.
In the following description, the subject side of the lens barrel is the front and the image side is the rear.
[0011]
As shown in FIGS. 1 and 2, the lens barrel 9 of the present embodiment mainly includes a fixed frame (not shown), a rotary frame 1 that is rotatably supported by the fixed frame, and a linear advance and retreat with respect to the fixed frame. An outer frame 2 that is a first frame that is guided in such a manner as to be inserted into the outer peripheral portion of the rotary frame 1 so as to be relatively rotatable, and an inner frame that is a second frame that is inserted into the inner peripheral portion of the outer frame 2 so as to be able to move forward and backward. A frame 3, a groove light shielding member 4 and a circumferential light shielding member 5 that are slidably fitted into the outer peripheral portion of the inner frame 3, and a spring ring 6 that is a pressing member fitted to the outer periphery of the groove light shielding member 4. It has.
[0012]
The rotating frame 1 is an annular member, and a helicoid male screw and a spur gear portion are disposed so as to overlap along the outer periphery of the rear ring portion 1 b of the rotating frame 1. An outer peripheral groove 1c is arranged along the outer periphery in front of the rear ring portion 1b. Further, three cam grooves 1 d for driving the inner frame 3 forward and backward are arranged on the inner periphery of the rotating frame 1.
[0013]
The helicoid male screw and spur gear portion of the rotary frame 1 are screwed or meshed with a helicoid female screw and a long gear on the fixed frame (not shown) side, and the rotary frame 1 is rotationally driven by the long gear. Then, it is driven to rotate forward and backward by the helicoid female screw.
[0014]
The outer frame 2 is also an annular member, and has an inner flange portion 2 f located on the inner side of the front end surface of the outer frame 2. On the inner periphery of the inward flange portion 2f, there are six guide projections (straight-advancing guide portions) 2a having a substantially small semicircular shape projecting inward, and six inner peripheral circular arc surfaces arranged between the guide projections 2a. 2g are arranged at substantially equal intervals. The arc center of the inner circumferential arc surface 2g is the optical axis O of the photographing lens or the center of the outer frame 2, but may be an axis parallel to the other optical axis O.
[0015]
Further, a pin 8 is fixed to the pin hole 2 e on the outer peripheral rear end side of the outer frame 2. The portion of the pin 8 that protrudes toward the outer diameter side becomes a guide pin portion that is slidably fitted into a straight guide groove (not shown) of the fixed frame, and the portion of the pin 8 that protrudes toward the inner peripheral surface side of the outer frame 2 Becomes a guide pin portion slidably fitted into the outer peripheral groove 1 c of the rotating frame 1. Therefore, the outer frame 2 is driven to advance and retreat along the optical axis O in a state in which the rotation of the outer frame 2 is restricted by the fixed frame and integrated with the movement of the rotary frame 1 in the optical axis O direction.
[0016]
The inner frame 3 is also an annular member, and connects between the six rectilinear guide grooves (engagement portions) 3a having a substantially small semicircular groove shape along the optical axis O and the rectilinear guide groove 3a. An outer peripheral cylindrical surface 3g composed of six arc portions is arranged. Furthermore, the cam follower 7 is fixed to the outer peripheral rear end. The rectilinear guide groove 3a of the inner frame 3 and the guide protrusion 2a of the outer frame 2 are arranged at circumferential positions where they can be engaged with each other. Further, in order to make the groove light-shielding member 4 easy to adhere, the connecting portion between the linear guide groove 3a and the outer cylindrical surface 3g is connected by an arc surface.
[0017]
The inner frame 3 is configured such that the outer peripheral cylindrical surface 3g is fitted into the inner peripheral circular arc surface 2g of the outer frame 2 with respect to the outer frame 2, and the straight guide groove 3a of the inner frame 3 is inserted into the guide protrusion 2a of the outer frame 2. Are engaged and assembled in a rotation restricted state. Therefore, the inner frame 3 is supported in a state in which the inner frame 3 can advance and retract. A lens frame (not shown) for holding the taking lens is incorporated in the inner periphery of the inner frame 3.
[0018]
The circumferential light shielding member 5 is a ring-shaped member formed of a material such as elastically deformable silicon rubber. The inner diameter portion as the second light shielding portion of the circumferential light shielding member 5 is slightly smaller than the diameter of the outer circumferential cylindrical surface 3g of the inner frame 3 by the press-fitting allowance in its free state. As shown in FIGS. 3 and 4, the circumferential light-shielding member 5 is inserted between the inner flange portion 2 f of the outer frame 2 and a groove light-shielding member 4 described later, and the outer peripheral cylindrical surface of the inner frame 3. It is press-fitted into 3 g and is slidably supported.
[0019]
The spring ring 6 is a substantially ring-shaped pressing member formed of a stainless thin plate spring material, and is used for restricting the rotation of an inner flange portion 6b and a substantially small semicircular protrusion protruding inside the inner flange portion 6b. 6 stoppers 6a, a leaf spring portion 6d that is once bent in a direction parallel to the optical axis O at six locations on the outer periphery, and further elastically deformable in a predetermined direction along the outer periphery, and the leaf spring portion A claw portion 6c having a substantially small semicircular convex shape provided at the tip of 6d. Note that the circumferential position of the claw portion 6c coincides with the circumferential position of the stopper 6a, and is further aligned with the circumferential position of the rectilinear guide groove 3a of the inner frame 3 in the assembled state. I'm doing it.
[0020]
The groove light shielding member 4 is a ring-shaped member formed of an elastically deformable material such as artificial leather, and the inner diameter portion of the groove light shielding member 4 is free of the inner frame 3 as shown in FIG. The dimension is such that there is a gap with respect to the outer diameter of the outer periphery.
[0021]
3 and 4, the groove light shielding member 4 is bonded and fixed to the inner peripheral portion of the spring ring 6 in contact with the inner flange portion 6b. In the bonded state, the groove light shielding member 4 is in a state where the inner peripheral portion of the contact portion is pushed out as a projection (convex portion) 4c which is the first light shielding portion by the claw portion 6c of the spring ring 6 (FIG. 5B )). The radial position of the protrusion 4c slightly protrudes inward on the stopper 6a of the spring ring 6 by the press-fitting allowance.
[0022]
As shown in FIGS. 3 and 4, the spring ring 6 and the groove light-shielding member 4 bonded and fixed to the spring ring 6 have the protrusion 4 c and the stopper 6 a of the spring ring 6 engaged with the rectilinear guide groove 3 a of the inner frame 3. The groove light shielding member 4 is inserted into the outer periphery of the inner frame 3 in the state, and at the same time, the groove light shielding member 4 is an inner peripheral portion of the outer frame 2 fitted to the inner frame 3, and behind the circumferential light shielding member 5. 1 is inserted at the front position of the front end face.
[0023]
When the groove light shielding member 4 is inserted into the inner frame 3, the protrusion 4c is inserted in a state of being pressed against the straight guide groove 3a. Further, in the arrangement state in the direction of the optical axis O, the spring ring 6 and the groove light shielding member 4 are in an uncompressed state between the front end face of the rotating frame 1 and the circumferential light shielding member inserted inside the outer frame 2; Alternatively, it is inserted with a slight gap in the direction of the optical axis O. Therefore, when the rotary frame 1 rotates, the groove light shielding member 4 and the circumferential light shielding member 5 do not come into contact with the direction of the optical axis O to increase the sliding resistance.
[0024]
In the state in which the inner frame 3 of the groove light shielding member 4 is inserted, the stopper 6 of the spring ring 6 in an adhesive state with the groove light shielding member 4 is engaged with the rectilinear guide groove 3a. Therefore, the groove light shielding member 4 slides relative to the inner frame 3 without rotating relative to the inner frame 3 while maintaining the pressed state without the projection 4c deviating from the rectilinear guide groove 3a. . However, the circumferential light shielding member 5 moves forward and backward in a state where the rotation is not actively restricted.
[0025]
In the lens barrel 9 of the present embodiment having the above-described configuration, when the rotary frame 1 is rotationally driven and driven forward and backward while rotating, the outer frame 2 is in a state of being guided in a straight line by the fixed frame. At the same time, the inner frame 3 is moved forward and backward along the optical axis O, and the inner frame 3 is moved to the optical axis O by the cam groove 1d of the rotary frame 1 while being restricted by the guide projection 2a of the outer frame 2 engaged with the straight guide groove 3a. Driven straight along. As described above, the gap between the sliding portions of the outer frame 2 and the inner frame 3 is shielded from light by the inner diameter portion of the circumferential light shielding member 5 at the same time. The projection 4c of the member 4 is reliably shielded from light.
[0026]
That is, in the inner frame 3 and the outer frame 2 in which the circumferential light shielding member 5 and the groove light shielding member 4 are incorporated, the circumferential fitting between the outer peripheral cylindrical surface 3g of the inner frame 3 and the inner peripheral circular arc surface 2g of the outer frame 2 is performed. The joint gap portion is shielded from light by the press contact of the circumferential light shielding member 5. The engagement gap around the engagement portion between the rectilinear guide groove 3a of the inner frame 3 and the guide protrusion 2a of the outer frame 2 is such that the protrusion 4c of the groove light shielding member 4 and both side portions thereof are connected to the inner frame 3 as described later. Light is shielded by being brought into pressure contact with the straight guide groove 3a and both side portions thereof.
[0027]
Here, regarding the area around the substantially small semicircular engaging portion between the rectilinear guide groove 3a of the inner frame 3 and the guide protrusion 2a of the outer frame 2, the inner circumferential arc surface 3g of the inner frame 3 and the rectilinear guide groove 3a The connecting portions on both sides are defined as curved surface areas S2 and S3 made of arcuate surfaces (FIG. 5B). A region including the substantially small semicircular engaging portion and the curved surface regions S2 and S3 is defined as an engaging region S1.
[0028]
The gap portion formed in the engagement region S1 including the curved surface regions S2 and S3 is formed by the protrusion 4c of the groove light shielding member 4 and both side portions thereof being in pressure contact with the straight guide groove 3a of the inner frame 3 and both side portions thereof. The light is surely shielded (FIG. 5B).
[0029]
The lens barrel 9 of the present embodiment does not require a rectilinear guide frame inside as in the conventional lens barrel in order to guide the inner frame 3 linearly relative to the outer frame 2 as described above. Therefore, the outer frame 2, the inner frame 3, the guide protrusion 2a, and the straight guide groove 3a engaged therewith are provided, and the structure can be made compact. As a light-shielding device for a linear guide mechanism having a complicated shape which is a problem in the lens barrel 9 of the present embodiment, the light-shielding circumferential light-shielding member 5 and the linear guide groove in the circumferential part sliding as described above. The light shielding groove light shielding member 4 is incorporated as a separate member so that the light shielding members 5 and 4 can be reliably shielded without being brought into pressure contact with the inner frame and the outer frames 3 and 2 with an excessive force. Further, since the groove light shielding member 4 does not rotate relative to the inner frame 3, a stable light shielding property can be obtained. Moreover, since the groove light shielding member 4 is formed of a soft material such as artificial leather, the protrusion 4c of the groove light shielding member 4 pushed out by the claw portion 6c of the spring ring 6 has the shape of the straight guide groove 3a of the inner frame 3. It fits and follows a certain light shielding. Further, since the pressure contact force of the light shielding member is small as described above, the forward / backward driving load of the lens barrel does not increase.
[0030]
The inner frame 3 in the lens barrel 9 of the first embodiment has a shape manufactured by injection molding, die casting, or the like using a synthetic resin or a metal material. It is also possible to apply a frame member made of a metal plate by press molding.
[0031]
Next, a lens barrel having a light shielding structure according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is an exploded perspective view of the lens barrel having the light shielding structure of the present embodiment. 7 is a cross-sectional view of the section taken along line EE in FIG. 6 showing a cross-sectional shape around the light-shielding portion of the lens barrel. FIG. 8 is a cross-sectional view taken along line FF in FIG.
[0032]
As shown in FIG. 6, the lens barrel 10 of the present embodiment mainly includes a fixed frame (not shown), a rotary frame 11 that is rotatably supported by the fixed frame, and is capable of moving forward and backward with respect to the fixed frame. An outer frame 12 that is a first frame that is guided to be inserted into the outer peripheral portion of the rotating frame 11 so as to be relatively rotatable, and an inner frame 13 that is a second frame that is inserted into the inner peripheral portion of the outer frame 12 so as to be able to advance and retract. And a light shielding member 14 slidably fitted in the outer peripheral portion of the inner frame 13.
[0033]
The rotating frame 11 is an annular member, and a helicoid male screw and a spur gear portion are arranged so as to overlap along the outer periphery of the rear ring portion 11 b of the rotating frame 11. An outer peripheral groove 11c is disposed along the outer periphery in front of the rear ring portion 11b. Further, three cam grooves 11 d for moving the inner frame 13 forward and backward are arranged on the inner periphery of the rotating frame 11.
[0034]
The helicoid male screw and spur gear portion of the rotary frame 11 are screwed or meshed with a helicoid female screw and a long gear on the fixed frame (not shown) side, and the rotary frame 11 is driven to rotate by the long gear. Then, it is driven to rotate forward and backward by the helicoid female screw.
[0035]
The outer frame 12 is also an annular member, and has an inner flange portion 12 f located on the inner side of the front end surface of the outer frame 12. On the inner periphery of the inner flange portion 12f, there are six guide projections (straight forward guide portions) 12a projecting inwardly in a semi-circular shape, and six inner peripheral circular arc surfaces arranged between the guide projections 12a. 12g are arranged at substantially equal intervals. Furthermore, six substantially small semicircular shapes having a convex amount smaller than that of each guide projection 12a at the same position as the guide projections 12a in the inner circumferential direction at the rear inner peripheral portion of the inner flange portion 12f. A (tip) protrusion 12h is disposed (FIG. 8). The arc center of the inner circular arc surface 12g is the optical axis O of the photographing lens or the center of the outer frame 12, but may be an axis parallel to the other optical axis O.
[0036]
A pin 15 is fixed to the pin hole 12 e on the outer peripheral rear end side of the outer frame 12. The portion of the pin 15 that protrudes toward the outer diameter side becomes a guide pin portion that is slidably fitted into a straight guide groove (not shown) of the fixed frame, and the portion of the pin 15 that protrudes toward the inner peripheral surface side of the outer frame 12 Becomes a guide pin portion slidably fitted into the outer peripheral groove 11 c of the rotating frame 11. Therefore, the outer frame 12 is driven to advance and retreat along the optical axis O in a state in which the rotation is restricted by the fixed frame and integrally with the movement of the rotating frame 11 in the optical axis O direction.
[0037]
The inner frame 13 is also an annular member, and connects between the six rectilinear guide grooves (engagement portions) 13a having substantially small semicircular grooves along the optical axis O and the rectilinear guide groove 13a. The cam follower 16 is fixed to the hole 13e at the outer peripheral rear end. The rectilinear guide groove 13a of the inner frame 13 and the guide protrusion 12a of the outer frame 12 are disposed at positions on the circumference where they can be engaged. Further, in order to make the light shielding member 14 easy to adhere, the connecting portion between the straight guide groove 13a and the outer peripheral cylindrical surface 13g is connected by an arc surface.
[0038]
The inner frame 13 is configured such that the outer peripheral cylindrical surface 13g is fitted into the inner peripheral circular arc surface 12g of the outer frame 12 with respect to the outer frame 12, and the straight guide groove 13a of the inner frame 13 is inserted into the guide projection 12a of the outer frame 12. Can be assembled in a state where the rotation is restricted. Therefore, the inner frame 13 is supported in a state in which it can advance and retreat relative to the outer frame 12. A lens frame (not shown) for holding the taking lens is built in the inner periphery of the inner frame 13.
[0039]
The light shielding member 14 is a ring-shaped member made of a material such as elastically deformable silicon rubber and having a plurality of protrusions on the inner peripheral surface. The light-shielding member 14 is a surface connecting the six substantially small semicircular protrusions (convex parts) 14a serving as the first light-shielding parts on the inner peripheral portion and the protrusions 14a, and is a second light-shielding member. It has six inner peripheral circular arc surfaces 14g as parts. In the state before the light shielding member 14 is attached, the inscribed circle diameter of the protrusion 14a is slightly smaller than the inscribed circle diameter of the valley portion of the rectilinear guide groove 13a of the inner frame 13, and can be pressed. . Further, the diameter of the inner peripheral circular arc surface 14g is slightly smaller than the outer peripheral cylindrical surface 13g of the inner frame 13, and can be press-fitted.
[0040]
As shown in FIGS. 7 and 8, the light shielding member 14 has the protrusion 14a press-engaged with the rectilinear guide groove 13a of the inner frame 13, and the inner circumferential arc surface 14g is press-fitted into the outer cylindrical surface 13g. Insert into the inner frame 13. At the same time, the light shielding member 14 is fitted and inserted so as to be positioned between the inner side of the inner flange portion 12 f of the outer frame 12 fitted to the inner frame 13 and the rotary frame 11. In the inserted state, the outward facing position of the protrusion 14a of the light shielding member 14 is pressed inward by the protrusion 12h of the outer frame 12 (FIG. 8). Therefore, the light shielding member 14 is rotationally restricted by the inner frame 13 in a state in which the protrusion 14 a is reliably pressed against the rectilinear guide groove 13 a of the inner frame 13, and moves forward and backward together with the rotating frame 11 and the outer frame 12. At the same time, it is reliably prevented that the protrusion 14a is disengaged from the rectilinear guide groove 13a during forward and backward movement.
[0041]
Regarding the arrangement of the light shielding member 14 in the optical axis O direction, the light shielding member 14 is not pressed between the front end surface of the rotating frame 11 and the inner surface of the flange surface 12f of the outer frame 12, or has a slight gap. Since it is incorporated, the light shielding member 14 does not contact in the direction of the optical axis O when the rotating frame 11 is rotated, and the sliding resistance does not increase.
[0042]
In the lens barrel 10 of the present embodiment having the above-described configuration, when the rotary frame 11 is rotationally driven and is driven to advance and retreat while rotating, the outer frame 12 is in a state where the outer frame 12 is linearly guided by the fixed frame. At the same time, the inner frame 13 moves forward and backward along the optical axis O, and the inner frame 13 is moved to the optical axis O by the cam groove 11d of the rotating frame 11 while being restricted by the guide protrusion 12a of the outer frame 2 that engages with the rectilinear guide groove 13a. Driven straight along. And the gap of the sliding fitting part with the complicated shape of the outer frame 12 and the inner frame 13 is shielded by the light shielding member 14 as described above.
[0043]
That is, in the inner frame 13 and the outer frame 12 in which the light shielding member 14 is incorporated, the circumferential fitting gap between the outer peripheral cylindrical surface 13g of the inner frame 13 and the inner peripheral circular arc surface 12g of the outer frame 12 is the light shielding member. The inner peripheral circular arc surface 14g of 14 is in contact with the outer peripheral cylindrical surface 13g of the inner frame 13 to be shielded from light. Further, the engagement gap around the engagement portion between the rectilinear guide groove 13a of the inner frame 13 and the guide projection 12a of the outer frame 12 is such that the projecting portion 14c of the light shielding member 14 and both side portions thereof are rectilinear guide grooves of the inner frame 13. The light is shielded by being brought into pressure contact with 13a and both side portions thereof.
[0044]
Since the lens barrel 10 of the present embodiment also guides the inner frame 13 linearly relative to the outer frame 12 as described above, a linear guide frame is not required inside unlike the conventional lens barrel. Therefore, each of the outer frame 12 and the inner frame 13 has a structure in which a guide protrusion 12a and a rectilinear guide groove 13a that engages with the guide protrusion 12a are provided.
[0045]
Particularly in the case of this embodiment, the light shielding device that slides as described above is used as a light shielding device for the linear guide mechanism portion having a complicated shape of the inner frame 13 and the outer frame 12 which is a problem in the lens barrel 10 of the present embodiment. The member 14 is incorporated, and the straight guide groove 13a and its both side portions are reliably shielded from light by the projecting portion 14a and its both side portions. Further, since the light shielding member 14 does not rotate relative to the inner frame 13, a stable light shielding state can be obtained. Further, since the single light shielding member 14 is applied as the light shielding member, the length of the lens barrel in the optical axis O direction can be shortened, the number of parts of the light shielding device can be reduced, and the assembling property is improved at the same time.
[0046]
In addition, the outer frame 12 and the inner frame 13 in the lens barrel 10 of the second embodiment have a shape manufactured by injection molding, die casting, or the like using a synthetic resin or a metal material. The inner frame 13 is not limited to the manufactured shape, but can be a frame member obtained by press-molding a metal plate.
[0047]
As a modified example of the lens barrel in the case where a frame member press-molded with a metal plate is applied to the outer frame, one shown in FIGS. 9 and 10 and FIGS. 11A and 11B can be proposed. .
In the lens barrel of this modification, the outer frame is formed of a metal plate with respect to the lens barrel 10 of the second embodiment, and the protrusion provided on the inner peripheral portion on the front end side of the outer frame 12 in the embodiment. A difference is that a fastening member made of a metal plate is added instead of the portion 12h. Other configurations apply the rotating frame 11, the inner frame 13, the light shielding member 14, and the like as in the case of the lens barrel 10 of the second embodiment. Hereinafter, different parts will be described.
[0048]
FIG. 9 shows a cross-sectional shape around the light shielding portion of the lens barrel of this modification. FIG. 10 is a cross-sectional view of the GG cross-section portion of FIG. 9, and FIGS. 11A and 11B show an external force acting on the inner frame of the lens barrel of this modification, and the inner frame is upward. FIG. 11A is a cross-sectional view in a cross section orthogonal to the optical axis O showing the state of the light-shielding portion when it is displaced, FIG. 11A shows the upper part of the lens barrel, and FIG. 11B is the lens barrel. The lower part of is shown.
[0049]
The outer frame 18 in the lens barrel of the present modification is an annular member made of a metal plate, and has an inner flange portion 18f extending inward of the front end surface of the outer frame 18 as shown in FIG. Yes. In addition, the outer frame 18 is provided with a guide projection 18a on the inner flange portion 18f similarly to the outer frame 12, and an inner peripheral circular arc surface and a pin are similarly arranged. Then, a metal plate fastening member 19 is inserted into the gap between the inner frame 18 f of the outer frame 18 and the front end surface of the rotating frame 11.
[0050]
The fastening member 19 is a substantially ring-shaped leaf spring member whose width in the direction of the optical axis O is slightly wider than the width of the light shielding member 14, and is provided with inwardly protruding portions 19h at six locations on the circumference. . The outer peripheral portion of the fastening member 19 is inserted into the inner peripheral portion of the outer frame 18.
[0051]
The protrusion 19h has a smaller amount of projection than the guide protrusion 18a in the assembled state in the outer frame 18, and is disposed at the same arrangement angle direction position in the circumferential direction behind the guide protrusion 18a. The protrusion 19h presses the outer peripheral portion of the protrusion 14a of the light shielding member 14 incorporated. Therefore, the protrusion 14a of the light shielding member 14 is pressed against the rectilinear guide groove 13a of the inner frame 13 so as not to come off.
[0052]
In the lens barrel of this modified example, an engagement state when an external force acts on the inner frame 13 and is displaced upward relative to the outer frame 18 will be described. 11A and 11B, the state before displacement of the inner frame 13 is indicated by a two-dot chain line, and the state where the inner frame 13 after displacement is relatively displaced upward is indicated by a solid line.
[0053]
When the central axes of the outer frame 18 and the inner frame 13 are relatively displaced upward, the protruding portion 19 h of the tightening member 19 in the displaced direction is moved into the rectilinear guide groove 13 a of the inner frame 13 by the movement of the inner frame 13. It is pressed with a stronger force than before the center axis is displaced via the light shielding member 14. Since the tightening member 19 is movable in the circumferential direction, the protruding portion 19h positioned above by the displacement of the inner frame 13 changes to the shape of the protruding portion 19i. When the diameter of the arc of the protrusion 19i of the tightening member 19 is greatly deformed, the radial force is converted into the circumferential force and transmitted in the circumferential direction. A part of the force is converted into a radial force by the protruding portion 19j on the opposite side of the protruding portion 19i of the tightening member 19 in the shifted direction, and presses the straight guide groove 13a of the inner frame 13 through the light shielding member 14. To do. Therefore, automatic adjustment is performed so that changes in increase and decrease in the pressing force between the rectilinear guide groove 13a and the light shielding member 14 are reduced. In this way, even when the central axes of the outer frame 18 and the inner frame 13 are relatively displaced, the contact state between the light shielding member 14 and the inner frame 13 is reliably maintained.
[0054]
According to the lens barrel of this modification, the fastening member 19 is provided between the outer frame 12 and the light shielding member 14, and the protrusion 14 a of the light shielding member 14 is pressed by the projection 19 h of the fastening member 19. The periphery of the 13 straight guide grooves 13a is securely pressed. Therefore, it is possible to reliably shield light from engaging portions of the guide protrusion 18a of the outer frame 18 and the straight guide groove 13a of the inner frame 13 having a complicated shape.
[0055]
Further, even when the central axes of the inner frame 13 and the outer frame 18 are displaced by an external force (unexpected force), the fastening member 19 is deformed, so that the rectilinear guide groove 13a of the inner frame 13 and the light shielding member due to the displacement of the central axis. 14 can suppress the change of increase and decrease of the pressing force to be small, and the light guide guide engaging portion between the outer frame 18 and the inner frame 13 can be shielded stably.
[0056]
Next, a lens barrel having a light shielding structure according to a third embodiment of the present invention will be described with reference to FIGS.
FIG. 12 is an exploded perspective view of the lens barrel having the light shielding structure of the present embodiment. 13 is a cross-sectional view of the HH cross-section portion of FIG. 12 showing a cross-sectional shape around the light-shielding portion of the lens barrel. 14 is a cross-sectional view taken along the line II of FIG.
[0057]
As shown in FIG. 12, the lens barrel 20 of the present embodiment mainly includes a fixed frame (not shown), a rotary frame 21 that is rotatably supported by the fixed frame, and can move forward and backward with respect to the fixed frame. A first frame outer frame 22 that is guided and fitted into the outer peripheral part of the rotary frame 21 so as to be relatively rotatable, and a second frame inner frame 23 that is fitted into the inner peripheral part of the outer frame 22 so as to be able to move forward and backward. And a light shielding member 24 slidably fitted into the outer peripheral portion of the inner frame 23.
[0058]
The rotating frame 21 is an annular member, and a helicoid male screw and a spur gear portion are disposed so as to overlap along the outer periphery of the rear ring portion 21 b of the rotating frame 21. Further, an outer peripheral groove 21c is arranged along the outer periphery in front of the rear ring portion 21b. Further, three cam grooves 21 d for driving the inner frame 23 forward and backward are arranged on the inner periphery of the rotating frame 21.
[0059]
The helicoid male screw and spur gear portion of the rotary frame 21 are screwed or meshed with a helicoid female screw and a long gear on the fixed frame (not shown) side, and the rotary frame 21 is driven to rotate by the long gear. Then, it is driven to rotate forward and backward by the helicoid female screw.
[0060]
Similarly, the outer frame 22 is an annular member, and has an inner flange portion 22 f located on the inner side of the front end surface of the outer frame 22. On the inner periphery of the inward flange portion 22f, there are six guide recesses (straight guide portions) 22a having a substantially small semicircular recess shape projecting inward, and six inner peripheral arcs arranged between the guide recesses 22a. The surfaces 22g are arranged at substantially equal intervals. Further, on the rear side of the inner flange portion 22f, two substantially small semicircular (tip) protrusions 22h are arranged at a total of twelve places so as to sandwich each guide recess 22a in the circumferential direction.
The arc center of the inner circular arc surface 22g is the optical axis O or the central axis of the outer frame 22, but may be an axis parallel to the other optical axis O.
[0061]
Further, a pin 25 is fixed to the pin hole 22 e on the outer peripheral rear end side of the outer frame 22. The portion of the pin 25 that protrudes to the outer diameter side becomes a guide pin portion that is slidably fitted into a straight guide groove (not shown) of the fixed frame, and the portion of the pin 25 that protrudes to the inner peripheral surface side of the outer frame 22 Becomes a guide pin portion slidably fitted into the outer peripheral groove 21 c of the rotating frame 21. Accordingly, the outer frame 22 is driven forward and backward along the optical axis O in a state in which the rotation is restricted by the fixed frame and in a state integrated with the movement of the rotary frame 21 in the optical axis O direction.
[0062]
Similarly, the inner frame 23 is an annular member, and includes six ridges (engaging portions) 23a having a substantially small semicircular convex cross section along the optical axis O, and six ridges connecting the ridges 23a. An outer peripheral cylindrical surface 23g composed of an arc portion is disposed. Further, a cam follower 26 is fixed to the hole 23e at the outer peripheral rear end. The protrusions 23a of the inner frame 23 and the guide recesses 22a of the outer frame 22 are disposed at positions on the circumference where they can be engaged. Further, in order to make the light shielding member 24 easy to adhere, the connecting portion between the protrusion 23a and the outer peripheral cylindrical surface 23g is connected by an arc surface.
[0063]
In the inner frame 23, the outer peripheral cylindrical surface 23 g is fitted into the inner peripheral circular arc surface 22 g of the outer frame 22 with respect to the outer frame 22, and the guide recess 22 a of the outer frame 22 is formed in the protrusion 23 a of the inner frame 23. It is assembled and engaged in a rotation restricted state, and is supported in an advanceable / retreatable state. A lens frame (not shown) for holding the taking lens is built in the inner peripheral portion of the inner frame 23.
[0064]
The light shielding member 24 is a ring-shaped member made of a material such as elastically deformable silicon rubber and having a plurality of recesses on the inner peripheral surface. The light-shielding member 24 is a surface connecting the recesses 24a, which are six substantially small semicircular cutouts as first light-shielding parts, and the recesses 24a on the inner periphery, and serves as a second light-shielding part. It has six inner circumferential arc surfaces 24g. In the state before the light shielding member 24 is attached, the circumscribed circle diameter of the concave portion 24a is slightly smaller than the circumscribed circle diameter of the protrusion 23a of the inner frame 23 and can be pressed. The diameter of the inner peripheral circular arc surface 24g is slightly smaller than the outer peripheral cylindrical surface 23g of the inner frame 23 and can be press-fitted.
[0065]
As shown in FIGS. 13 and 14, the light-shielding member 24 has a concave portion pressed into and engaged with the protrusion 23a of the inner frame 23, and an inner circular arc surface 24g is press-fitted into the outer cylindrical surface 23g. Insert into. Further, the light shielding member 24 is inserted inside the inner flange portion 22 f of the outer frame 22. In the inserted state, both side portions of the recesses 24a on the outer peripheral surface of the light shielding member 24 are pressed inward by the two protrusions 22h of the outer frame 22 (FIG. 14). Therefore, the concave portion 24a of the light shielding member 24 is pressed by the two protrusions 22h, and is firmly attached to the protrusion 23a of the inner frame 23, and is prevented from coming off during forward and backward movement.
[0066]
The light-shielding member 24 incorporated as described above is rotationally restricted by the inner frame 13 with its recess 24 a being pressed against the protrusion 23 a of the inner frame 23, and moves forward and backward together with the rotating frame 21 and the outer frame 22. . As for the arrangement of the light shielding member 24 in the direction of the optical axis O, the light shielding member 24 is not pressed between the front end surface of the rotating frame 21 and the inner surface of the flange surface 22f of the outer frame 22, or there is a slight gap. Since it is incorporated, the light shielding member 24 does not contact in the direction of the optical axis O when the rotating frame 21 rotates, and the sliding resistance does not increase.
[0067]
In the lens barrel 20 of the present embodiment having the above-described configuration, when the rotary frame 21 is rotationally driven and is driven to advance and retract while rotating, the outer frame 22 is linearly guided by the fixed frame and is rotated. Along with the optical axis O, the inner frame 23 moves along the optical axis O by the cam groove 21d of the rotating frame 21 while being restricted in rotation by the guide recess 22a of the outer frame 2 engaged with the protrusion 23a. Driven straight. The gap of the sliding fitting portion between the outer frame 22 and the inner frame 23 is shielded by the light shielding member 24 as described above.
[0068]
That is, in the inner frame 23 and the outer frame 22 in which the light shielding member 24 is incorporated, the circumferential fitting clearance between the outer peripheral cylindrical surface 23g of the inner frame 23 and the inner peripheral circular arc surface 22g of the outer frame 22 is the light shielding member 24. The inner peripheral circular arc surface 24g is shielded from light by being in pressure contact with the outer peripheral cylindrical surface 23g of the inner frame 23. Further, the engagement gap around the engagement portion between the protrusion 23a of the inner frame 23 and the guide recess 22a of the outer frame 2 is the same as the protrusion 24a of the inner frame 23 and the protrusion 23a of the inner frame 23. The light is shielded by being brought into pressure contact with both side portions. In addition, the light shielding member 24 is restricted in rotation with respect to the inner frame 23 by the protrusions of the inner frame 23 and moves relatively only in the optical axis O direction.
[0069]
Since the lens barrel 20 of the present embodiment also guides the inner frame 23 relative to the outer frame 22 as described above, it does not require a rectilinear guide frame inside unlike the conventional lens barrel. Therefore, each of the outer frame 22 and the inner frame 23 has a structure in which a guide recess 22a and a protrusion 23a engaged with the guide recess 22a are provided.
[0070]
With regard to the light shielding device for the linear guide mechanism having a complicated shape with the inner frame 23 and the outer frame 22 which are problematic in the lens barrel 20 of the present embodiment, particularly in the case of the present embodiment, the single sliding as described above. The light shielding member 24 is incorporated, and the projections 23a of the inner frame 23 and the both side portions thereof are pressed from the outside by the two protrusions 22h at the respective concave portions 24a and both side portions thereof, thereby ensuring reliable light shielding. Is possible. At the same time, the outer circumferential arc portion 23 a of the inner frame 23 is shielded from light by the inner circumferential arc surface 24 g of the light shielding member 24. Since the light shielding member 24 does not rotate relative to the inner frame 23, the light shielding state is stabilized. Furthermore, since only a single light shielding member 24 is used as the light shielding member, the area occupied in the optical axis O direction is small, the lens barrel can be made compact, and the number of parts of the light shielding device can be reduced. At the same time, the assembly is improved.
[0071]
The outer frame 22 and the inner frame 23 in the lens barrel 20 of the third embodiment have a shape manufactured by injection molding, die casting, or the like using a synthetic resin or a metal material. The inner frame 23 is not limited to the manufactured shape, but can be a frame member obtained by press-molding a metal plate.
[0072]
Proposing the one shown in FIGS. 15 and 16 and FIGS. 17A and 17B as one of the modified examples of the lens barrel when a frame member obtained by press-molding the outer frame 22 with a metal plate is applied. it can.
[0073]
In the lens barrel of this modification, the outer frame is formed of a metal plate with respect to the lens barrel 20 of the third embodiment, and the protrusion provided on the inner peripheral portion of the front end side of the outer frame 22 in the embodiment. A difference is that a fastening member made of a metal plate is incorporated in place of the portion 22h. In other configurations, the rotating frame 21, the inner frame 23, the light shielding member 24, and the like are applied as in the case of the lens barrel 20 of the third embodiment. Hereinafter, different parts will be described.
[0074]
FIG. 15 shows a cross-sectional shape around the light-shielding portion of the lens barrel of this modification. 16A and 16B are cross-sectional views of the JJ cross section of FIG. 15. FIGS. 17A and 17B show an external force acting on the inner frame of the lens barrel of the present modification, and the inner frame is upward. It is sectional drawing in the cross section orthogonal to the optical axis O which shows the state of the light-shielding part when it is displaced to. FIG. 17A shows an upper portion of the lens barrel, and FIG. 17B shows a lower portion of the lens barrel.
[0075]
The outer frame 28 in the lens barrel of this modification is an annular member made of a metal plate, and has an inner flange portion 28f extending inward of the front end surface of the outer frame 28 as shown in FIG. Yes. In addition, the outer frame 28 is provided with a guide recess 28 a in the inner flange portion 28 f, and an inner circumferential arc surface and pins are similarly arranged in the same manner as the outer frame 22.
[0076]
A fastening member 29 made of a metal plate is inserted into the gap between the front end surface of the rotary frame 21 and inside the inner flange portion 28 f of the outer frame 28.
[0077]
The fastening member 29 is a substantially ring-shaped leaf spring member whose width in the direction of the optical axis O is slightly wider than the width of the light shielding member 14, and is inwardly protruded at a total of twelve locations on the circumference. 29h is provided. The outer periphery of the fastening member 29 is inserted inside the outer frame 22.
[0078]
The protrusions 29h are arranged in a pair state straddling in the arrangement position direction on the circumference corresponding to each guide recess 28a in the assembled state in the outer frame 28. Then, two locations on the outer diameter side facing the respective recesses 23a of the light shielding member 24 are pressed in a state of being elastically deformed in the radial direction. Therefore, the concave portion 24a of the light shielding member 24 is kept in close contact with the protrusion 23a of the inner frame 23 and pressed so as not to come off.
[0079]
In the lens barrel of this modification, an engagement state when an external force acts on the inner frame 23 and is displaced upward relative to the outer frame 28 will be described. 17A and 17B, the state before displacement of the inner frame 23 is indicated by a two-dot chain line, and the state where the inner frame 23 after displacement is relatively displaced upward is indicated by a solid line.
[0080]
As described above, when the central axes of the inner frame 23 and the outer frame 28 are relatively displaced up and down, the protruding portion 29h of the tightening member 29 in the displaced direction causes the inner frame 23 to move. The protrusion 23a is pressed by a stronger force than before the center axis is displaced through the light shielding member 24. Since the tightening member 29 is movable in the circumferential direction, the protrusion 29h changes to the shape of the protrusion 29i due to the displacement of the inner frame 23 (FIG. 17A). When the diameter of the arc of the protrusion 29i of the tightening member 29 is greatly deformed, the force in the radial direction is converted to the force in the circumferential direction and transmitted in the circumferential direction. A part of the force is converted into a radial force by the projecting portion 29j on the opposite side of the projecting portion 29i of the tightening member 29 in the shifted direction, and the force that pushes the ridge 23a of the inner frame 23 through the light shielding member 24 To be added.
[0081]
According to the lens barrel of this modified example, by providing the clamping member 29 between the outer frame 22 and the light shielding member 24, the two projections 29 h of the clamping member 29 can be used to connect both sides of the concave portions 24 a of the light shielding member 24. Press from outside. By the pressing, the concave portion 24a is surely pressed around the ridge 23a of the inner frame 23, and the guide concave portion 28a of the outer frame 28 having a complicated shape and the ridge 23a of the inner frame 23 can be stably shielded from light. it can.
[0082]
Further, even when the central axes of the inner frame 23 and the outer frame 28 are deviated by an external force (unexpected force), the tightening member 29 is deformed, whereby the protrusions 23a and the light shielding member 24 of the inner frame 23 due to the deviation of the central axis. It is possible to suppress the change of the increase and decrease of the pressing force and to stably shield the light from the engaging portion for the straight guide of the outer frame 28 and the inner frame 13.
[0083]
  The following configuration can be proposed by the present invention. That is,
(Additional remark 1) The 1st frame in which the rectilinear guide part which protrudes toward inner side was formed in the one end part of an optical axis direction,
  Moves relative to the first frame in the optical axis direction, which is disposed inside the first frame and is formed with a groove that is engageable with the linear guide portion and extends in the optical axis direction. A possible second frame;
  A light shielding member disposed between the first frame and the second frame, for keeping light tight between the first frame and the second frame;
  A pressing member that is disposed between the light shielding member and the first frame and presses the light shielding member so as to abut against the second frame;
  And the pressing member presses the light shielding member at a position corresponding to the groove in the circumferential direction of the second frame.apparatus.
[0084]
(Additional remark 2) The said light-shielding member consists of a convex part engageable with the said groove part, and the circular arc part formed with respect to the outer periphery of the said 2nd frame, The lens mirror of Additional remark 1 characterized by the above-mentioned. Tube shadingapparatus.
[0085]
(Additional remark 3) The 1st frame in which the rectilinear guide part which protrudes toward inner side was formed in the one end part of an optical axis direction,
  Relatively in the optical axis direction with respect to the first frame, which is disposed inside the first frame and is formed with a groove portion that can be engaged with the rectilinear guide portion and extends in the optical axis direction. A movable second frame;
  A light shielding member disposed between the first frame and the second frame, for keeping light tight between the first frame and the second frame;
  A pressing portion that is on the inner peripheral surface of the first frame and is formed at a position corresponding to the groove portion in the circumferential direction;
  The pressing portion presses the light shielding member so that the light shielding member comes into contact with the second frame.apparatus.
[0086]
(Additional remark 4) The said light shielding member consists of a convex part engageable with the said groove part, and the circular arc part formed corresponding to the outer periphery of the said 2nd frame, The lens of Additional remark 3 characterized by the above-mentioned. Shading the lens barrelapparatus.
[0087]
(Additional remark 5) The 1st frame in which the rectilinear guide part which consists of a recessed part drilled inside the one end part of an optical axis direction was formed,
  Relative to the first frame with respect to the first frame, which is disposed on the inner side of the first frame and is formed with a protrusion that can be engaged with the linear guide portion and extends in the optical axis direction. A movable second frame;
  A light shielding member disposed between the first frame and the second frame, for keeping light tight between the first frame and the second frame;
  A pressing member that is disposed between the light shielding member and the first frame and presses the light shielding member so as to abut against the second frame;
  And the pressing member presses the light shielding member at positions corresponding to both sides of the protrusion in the circumferential direction of the second frame.apparatus.
[0088]
(Additional remark 6) The said light-shielding member consists of a recessed part engageable with the said protrusion, and the circular arc part formed corresponding to the outer periphery of the said 2nd frame, The lens of Additional remark 5 characterized by the above-mentioned. Shading the lens barrelapparatus.
[0089]
(Supplementary Note 7) A first frame in which a rectilinear guide portion formed of a concave portion formed on the inner peripheral side of one end portion in the optical axis direction is formed;
  Relative to the first frame with respect to the first frame, which is disposed on the inner side of the first frame and is formed with a protrusion that can be engaged with the linear guide portion and extends in the optical axis direction. A movable second frame;
  A light shielding member disposed between the first frame and the second frame, for keeping light tight between the first frame and the second frame;
  A pressing portion formed on the inner peripheral surface of the first frame at a position corresponding to both sides of the protrusion in the circumferential direction;
  And the pressing portion presses the light shielding member so that the light shielding member comes into contact with the second frame.apparatus.
[0090]
(Additional remark 8) The said light-shielding member consists of a recessed part engageable with the said protrusion, and the circular arc part formed corresponding to the outer periphery of the said 2nd frame, The lens of Additional remark 7 characterized by the above-mentioned. Shading the lens barrelapparatus.
[0091]
【The invention's effect】
According to the present invention, there is provided a device for performing light shielding of a fitting gap between the second frame supported so as to be able to move forward and backward relative to the first frame and the first frame by a light shielding member, A lens that can perform stable light shielding of the joint gap, and can suppress an increase in the forward / backward driving load of the lens barrel by reducing the tightening force to the frame member by the light shielding member, and can further reduce the size of the lens barrel. A light blocking device for a lens barrel can be provided.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a lens barrel having a light shielding structure according to a first embodiment of the present invention.
2 is a vertical cross-sectional view of the lens barrel of FIG. 1, in which the upper half shows a zoom wide state and the lower half shows a zoom telephoto state.
3 is a cross-sectional view taken along the line AA in FIG. 1, showing a cross section around the light shielding portion of the lens barrel in FIG.
4 is a cross-sectional view taken along the line BB in FIG. 1, showing a cross section around the light-shielding portion of the lens barrel in FIG. 1;
5 is a view showing a cross section orthogonal to the optical axis of the circumferential light shielding member portion or groove light shielding member portion in the lens barrel shown in FIG. 1, and FIG. 5 (A) is a cross section taken along the line CC in FIG. FIG. 5B is a cross-sectional view taken along the line DD of FIG.
FIG. 6 is an exploded perspective view of a lens barrel having a light shielding structure according to a second embodiment of the present invention.
7 is a cross-sectional view taken along line EE in FIG. 6 showing a cross-sectional shape around the light-shielding portion of the lens barrel in FIG. 6;
8 is a cross-sectional view taken along the line FF in FIG.
9 shows a cross-sectional shape around a light shielding portion in a modification of the lens barrel of FIG.
10 is a cross-sectional view taken along the line GG in FIG. 9; FIG.
FIG. 11 is a cross-sectional view orthogonal to the optical axis showing the state of the light-shielding portion when an external force is applied to the inner frame in the lens barrel of the modified example of FIG. 9 and the inner frame is displaced upward. FIG. 11A shows the upper part of the lens barrel, and FIG. 11B shows the lower part of the lens barrel.
FIG. 12 is an exploded perspective view of a lens barrel having a light shielding structure according to a third embodiment of the present invention. .
13 is a cross-sectional view of the HH cross-section portion of FIG. 12 showing a cross-sectional shape around the light shielding portion of the lens barrel of FIG.
14 is a cross-sectional view taken along the line GG in FIG.
15 shows a cross-sectional shape around a light-shielding portion in a modification of the lens barrel shown in FIG.
16 is a cross-sectional view taken along the line JJ of FIG.
FIG. 17 is a cross-sectional view in a cross section orthogonal to the optical axis showing the state of the light shielding portion when an external force acts on the inner frame and the inner frame is displaced upward in the lens barrel of the modified example of FIG. FIG. 17A shows the upper part of the lens barrel, and FIG. 17B shows the lower part of the lens barrel.
[Explanation of symbols]
2, 12, 18, 22, 29 ... outer frame (first frame)
2a, 12a ... Guide protrusion (protrusion, straight guide part)
3, 13, 23 ... inner frame (second frame)
3a, 13a ... Straight guide groove (engagement part, groove)
3g, 13g, 23g ... outer peripheral cylindrical surface (arc part)
4 ... groove light shielding member (light shielding member)
4c, 14a ... Projection (first light shielding part, light shielding member)
5 ... Circumference light shielding member (second light shielding part, light shielding member)
14, 24 ... light shielding member
14 g, 24 g... Circular arc surface (second light shielding portion)
22a, 28a ... Guide recess (straight forward guide, recess)
23a ... ridge (engagement part)
24a ... concave portion (first light shielding portion)

Claims (2)

第１の枠と、
上記第１の枠の内部に配され、上記第１の枠に対し光軸方向に相対的に移動可能な第２の枠と、
上記第１の枠の内周側に形成された直進ガイド部と、
上記第２の枠の外周側に形成され、上記直進ガイド部と係合する係合部と、
上記第１の枠と第２の枠との間に配され、第１の枠と第２の枠との間を光密に保つための遮光部材と、
を具備し、上記係合部は、略小半円形状の断面形状をなし、
上記遮光部材は、上記第２の枠の係合部と係合する第１の遮光部と、上記第２の枠の円弧部に当接する第２の遮光部とからなり、
上記直進ガイド部は、上記第１の枠の内部に向けて突出する突起からなり、上記係合部は、上記突起と係合可能な溝からなるとともに、上記第１の遮光部は上記溝に対して押圧された状態で係合され、上記第２の遮光部は上記第２の枠の円弧部に対して非押圧状態で当接されていることを特徴とするレンズ鏡筒の遮光装置。A first frame;
A second frame disposed inside the first frame and movable relative to the first frame in the optical axis direction;
A rectilinear guide portion formed on the inner peripheral side of the first frame;
An engaging portion formed on the outer peripheral side of the second frame and engaged with the rectilinear guide portion;
A light-shielding member disposed between the first frame and the second frame, for keeping light tight between the first frame and the second frame;
And the engaging portion has a substantially small semicircular cross-sectional shape,
The light shielding member, Ri Do from the first light-shielding portion that engages with the engagement portion of the second frame, the second light-shielding portion in contact with the arcuate portion of the second frame,
The rectilinear guide portion includes a protrusion that protrudes toward the inside of the first frame, the engagement portion includes a groove that can be engaged with the protrusion, and the first light shielding portion is formed in the groove. A lens barrel light-shielding device , wherein the second light-shielding portion is engaged in a pressed state against the arc portion of the second frame in a non-pressed state . 第１の枠と、
上記第１の枠の内部に配され、上記第１の枠に対し光軸方向に相対的に移動可能な第２の枠と、
上記第１の枠の内周側に形成された直進ガイド部と、
上記第２の枠の外周側に形成され、上記直進ガイド部と係合する係合部と、
上記第１の枠と第２の枠との間に配され、第１の枠と第２の枠との間を光密に保つための遮光部材と、
を具備し、上記係合部は、略小半円形状の断面形状をなし、
上記遮光部材は、上記第２の枠の係合部と係合する第１の遮光部と、上記第２の枠の円弧部に当接する第２の遮光部とからなり、
上記直進ガイド部は、上記第１の枠の内側に形成された凹部からなり、上記係合部は、上記凹部と係合可能な突条からなるとともに、上記第１の遮光部は上記突条に対して非押圧状態で係合され、上記第２の遮光部は上記第２の枠の円弧部に対して押圧された状態で当接されていることを特徴とするレンズ鏡筒の遮光装置。 A first frame;
A second frame disposed inside the first frame and movable relative to the first frame in the optical axis direction;
A rectilinear guide portion formed on the inner peripheral side of the first frame;
An engaging portion formed on the outer peripheral side of the second frame and engaged with the rectilinear guide portion;
A light-shielding member disposed between the first frame and the second frame, for keeping light tight between the first frame and the second frame;
And the engaging portion has a substantially small semicircular cross-sectional shape,
The light shielding member includes a first light shielding portion that engages with an engagement portion of the second frame, and a second light shielding portion that abuts on an arc portion of the second frame,
The rectilinear guide portion includes a recess formed inside the first frame, the engagement portion includes a protrusion that can be engaged with the recess, and the first light shielding portion includes the protrusion. The lens barrel light shielding device , wherein the second light shielding portion is brought into contact with the arc portion of the second frame in a pressed state. .
JP2002076778A 2002-03-19 2002-03-19 Lens barrel shading device Expired - Fee Related JP4037665B2 (en)

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JP2007155886A (en) * 2005-12-01 2007-06-21 Sanyo Electric Co Ltd Lens drive
CN100561279C (en) * 2007-04-29 2009-11-18 鸿富锦精密工业（深圳）有限公司 Camera lens module and camera module
JP2011048348A (en) 2009-07-27 2011-03-10 Panasonic Corp Lens barrel and imaging device
JP2011048349A (en) 2009-07-31 2011-03-10 Panasonic Corp Lens barrel and imaging device
KR101828534B1 (en) * 2012-06-15 2018-02-12 한화테크윈 주식회사 A lens barrel assembly

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