JP4331519B2

JP4331519B2 - Eye cup

Info

Publication number: JP4331519B2
Application number: JP2003178648A
Authority: JP
Inventors: 和行岩佐
Original assignee: Olympus Corp
Current assignee: Olympus Corp
Priority date: 2003-06-23
Filing date: 2003-06-23
Publication date: 2009-09-16
Anticipated expiration: 2023-06-23
Also published as: JP2005017402A

Description

【０００１】
【発明の属する技術分野】
本発明は、光学機器に着脱可能な防水機能を有するアイカップに関する。
【０００２】
【従来の技術】
従来、光学機器に着脱可能な防水機能を有するアイカップとして特許文献１に開示のアイカップは、アイピース枠にスムーズに装着可能であって、かつ、気密性が保持できるものである。すなわち、アイカップに金属などからなる摺動部材を設け、この摺動部材をカメラ本体側のアイピース枠にスライドして当接させることにより気密性を持たせる構造を採用している。また、特許文献１には、別のアイカップとして、上記摺動部材を片持ち梁状に上記アイカップに取り付け、接眼窓と摺動部材間にＯリングを介在させたものも提案されている。
【０００３】
【特許文献１】
特許文献１は、特開平１１−１０９４４２号公報である。
【０００４】
【発明が解決しようとする課題】
上述した特許文献１に提案されたアイカップにおいては、上記摺動部材とアイピース枠間の気密性は確保されるが、上記摺動部材とアイカップ間の気密性については、特に考慮されていない。また、上記摺動部材を片持ち梁状に上記アイカップにＯリングを介して取り付けるものが提案されているが、この場合、摺動部材とアイカップの間を気密性を保持するために両者を接着する必要がある。
【０００５】
本発明は、上述の不具合を解決するためになされたものであり、防水機能を有するアイカップにおいて、接着等を必要とせず組み付けが容易であり、確実な防水機能を有する光学機器に着脱可能なアイカップを提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明の第１のアイカップは、外周方向に突出して配された係合爪を有する光学機器の光学機器側係合部に着脱可能なアイカップであって、アイカップ本体と、弾性変形可能なシール性を有する部材であって、上記アイカップ本体に保持される弾性防水部材と、保持された上記弾性防水部材よりも上記光学機器側の上記アイカップ本体に設けられ、上記光学機器側係合部に配された上記係合爪と係合する凹状の係合部と、上記凹状の係合部において上記弾性防水部材側に突出して配された凸部と、上記凹状の係合部に隣接して配され、上記係合爪が挿入される切り欠き部と、を具備し、上記切り欠き部に挿入された上記係合爪が、上記凹状の係合部に配された上記凸部方向に向けて相対移動し上記係合爪が上記凸部を乗り上げる際には、上記光学機器側係合部の一部を形成する後端面が上記弾性防水部材を圧縮することにより上記アイカップ本体に対して上記弾性防水部材を密着状態に保持し、上記係合爪が上記凸部を乗り越えて上記凹状の係合部に装着状態になった際には、上記弾性防水部材の密着状態を軽減すると共に、上記凸部により上記係合爪の回転を規制することを特徴とする。
【０００７】
本発明の第２のアイカップは、上記第１のアイカップにおいて、上記凹状の係合部は、上記係合爪が上記凹状の係合部に装着状態になった際に、上記係合爪と当接する当接面をさらに有し、上記係合爪が一方に回転した際には上記当接面と当接することにより当該回転を規制し、上記係合爪が他方に回転した際には上記凸部と上記係合爪のクリック作用により当該回転を規制することを特徴とする。
【０００８】
本発明の第３のアイカップは、上記第１のアイカップにおいて、上記光学機器側係合部の一部を形成する後端面には、環状に配された押圧部が設けられ、当該押圧部により上記弾性防水部材を圧縮する圧縮量を多くしたことを特徴とする。
【０００９】
本発明の第４のアイカップは、外周方向に突出して配された係合爪を有する光学機器の光学機器側係合部に着脱可能なアイカップであって、アイカップ本体と、アイカップ本体に保持される光学部材と、弾性変形可能なシール性を有する部材であって、上記光学部材より上記光学機器側に配置された弾性防水部材と、保持された上記弾性防水部材よりも上記光学機器側の上記アイカップ本体に設けられ、上記光学機器側係合部に配された上記係合爪と係合する凹状の係合部と、上記凹状の係合部において上記弾性防水部材側に突出して配された凸部と、上記凹状の係合部において、上記係合爪が上記凹状の係合部に装着状態になった際に、上記係合爪と当接する当接面と、上記凹状の係合部に隣接して配され、上記係合爪が挿入される切り欠き部と、を具備し、上記切り欠き部に挿入された上記係合爪が、上記凹状の係合部に配された上記凸部方向に向けて回転移動し上記係合爪が上記凸部を乗り上げる際には、上記光学機器側係合部の一部を形成する後端面が上記弾性防水部材を上記光学部材方向に所定量圧縮することにより上記弾性防水部材を上記光学部材に密着させ、上記係合爪が上記凸部を乗り越えて上記凹状の係合部に装着状態になった際には、上記弾性防水部材の圧縮量を軽減させると共に、上記凸部と上記当接面とにより上記係合爪の回転を規制することを特徴とする。
【００１０】
本発明の第５のアイカップは、上記第１，３，４のアイカップにおいて、上記弾性防水部材は、マイクロセルポリマーシートにより形成されていることを特徴とする。
【００１３】
【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、本発明の一実施形態の光学機器であるカメラのアイカップ装着状態でのファインダ接眼ユニットの断面図である。図２は、上記アイカップの分解斜視図である。図３は、上記ファインダ接眼ユニットの接眼カバーとアイカップとの分解斜視図である。また、図４は、図３のＢ−Ｂ断面図であって、上記接眼カバーの後端部外周の断面を示す。図５（Ａ）は、図２のＡ矢視の展開図であって、上記アイカップのアイカップ本体切り欠き部まわりを示し、図５（Ｂ）は、図５（Ａ）のＥ−Ｅ断面図である。
【００１４】
以下の説明において、ファインダ光軸Ｏに沿った方向にてペンタプリズム側を前方とし、アイポイント側を後方とする。また、回転方向は、後方側から見たときの回動方向で示す。
【００１５】
図１に示すようにファインダ接眼ユニット１は、光学機器であるカメラの外装カバーの一部である接眼カバー１１内部であって、ファインダ部４のペンタプリズム４ａの射出側のファインダ内表示部５，測光部６の配設位置後方部に配置されている。接眼カバー１１のアイカップ装着部となる後端部１１ａには後述するアイカップ３が着脱可能である。
【００１６】
このファインダ接眼ユニット１は、ファインダ光軸Ｏｆを有しており、前方側の接眼１群レンズ１３を保持する接眼ユニット本体１２と、接眼ユニット本体１２に進退自在に支持され、接眼２群レンズ１５を保持する２群接眼枠１４と、接眼ユニット本体１２の後方側に固定支持され、接眼３群レンズ１７を保持する３群接眼枠１６と、２群接眼枠１４を進退駆動するための視度調節リング１８と、２群接眼枠１４を付勢する視度調節付勢バネ１９とを有している。
【００１７】
視度調節リング１８には、カム部１８ａが設けられ、該リング１８を回動操作するとカム部１８ａにより２群接眼枠１４のカムフォロワ１４ａが駆動され、２群接眼枠１４がファインダ光軸Ｏｆに沿って進退移動し、視度調節が行われる。
【００１８】
接眼カバー１１の後端部１１ａ内に接眼開口部１６ａを持つ３群接眼枠１６が位置している。また、接眼カバー１１の後端部外周１１ｂには、図３に示すように３等分位置に後端面１１ｃに沿って外方に突出する光学機器側係合部となる係合爪１１ｆが配される。
【００１９】
後端部外周１１ｂは、後述するアイカップ本体２１の前面側の開口２１ｅに嵌合可能な寸法とする。そして、３つの係合爪１１ｆは、後述するアイカップ本体２１の前面開口２１ｅ上の切り欠き部２１ｆに挿入可能とする。
【００２０】
さらに、接眼カバー１１の後端面１１ｃ上には、図４に示すように全周にわたってアイカップ側（後方側）にわずかに突出する突条１１ｄが設けられる。この突条１１ｄは、その断面形状が半円形状であり、後述する防水シート部材２４の前面を押圧する光軸Ｏｆまわりの環状の押圧部である。その環状の直径の大きさは、後述するカバーガラス２３の外径より小さい。
【００２１】
アイカップ３は、図１，２に示すようにアイカップ本体２１と、アイカップ本体２１内に組み込まれる透明な光学素子であるカバーガラス２３および防水部材である防水シート部材２４と、アイカップ本体２１の外周を覆うよう装着されるゴムカバー２２とを有している。
【００２２】
アイカップ本体２１は、後方中央開口部２１ａを有し、さらに、内周部にカバーガラス保持用開口である円形凹部２１ｂと、内周溝状の防水シート部材保持部である溝部２１ｄと、前面側に防水シート部材挿入用開口部２１ｅと、開口部２１ｅ上の３等分位置に配される切り欠き部２１ｆと、切り欠き部２１ｆに隣接して接眼カバーの係合爪１１ｆと係合可能な係合部２１ｇを有している。
【００２３】
凹部２１ｂの内周は、カバーガラス２３の外径より大きく、その凹部の段差は、カバーガラス２３の厚みより浅い。
【００２４】
開口部２１ｅの内周は、凹部２１ｂの内径と同等、または、それより大きく、かつ、防水シート部材２４の外径より小さい。
【００２５】
溝部２１ｄの底部内周は、防水シート部材２４の外径と等しいか、わずかに大きい。また、溝部２１ｄの溝幅は、凹部２１ｂにカバーガラス２３を挿入し、さらに、防水シート部材２４を挿入した状態で防水シート部材２４の厚みを圧縮しない程度の溝幅を有している。
【００２６】
図２，図５（Ａ），５（Ｂ）に示すように溝部２１ｄの溝幅面から前方側に形成される凹状の係合部２１ｇが３つの切り欠き部２１ｆの時計回り側（図２上では、反時計周り側）にそれぞれ隣接して設けられる。この係合部２１ｇは、接眼カバー１１の係合爪１１ｆが係合するアイカップ側係合部となる。係合部２１ｇの周方向で切り欠き２１ｆ側には、後方（防水シート部材側）に突出する半円形断面の当接部である凸部２１ｈが、その凸部２１ｈの反対側に当接面２１ｉとが設けられる。
【００２７】
防水シート部材２４は、高密度の発泡性樹脂であるマイクロセルポリマーシート（例えば、マイクロセルウレタンフォーム）を素材とし、中央に開口部２４ａを有する円環形状のシート部材である。このマイクロセルポリマーシートは、非常に細密な、かつ、均一なセル構造を有しており、圧縮残留ひずみが少なく、長期間にわたって安定したシール性を有し、さらに、表面の摺動性が良好である。なお、開口部２４ａの大きさは、アイカップ本体２１の中央開口部２１ａおよび３群接眼枠１６の後部外径より大きく、かつ、カバーガラス２３の外径より小さい。また、防水シート部材２４の厚みは、圧縮した場合に防水機能を満足するに十分な圧縮代がとれる厚みとする。
【００２８】
上述した構成を有する接眼カバー１１にアイカップ３を装着する装着動作について図３，６等を用いて説明する。
図６は、アイカップの装着過程における図３のＣ矢視の展開図を示し、図６（Ａ）は、アイカップを接眼カバーの係合爪部に挿入した状態を示す。図６（Ｂ）は、その後、アイカップをわずかに反時計回り（図３のＤａ方向）に回動させた状態を示す。図６（Ｃ）は、アイカップを所定量だけ反時計回りに回動させた装着状態を示す。
【００２９】
図３に示すようにゴムカバー２２が装着されたアイカップ本体２１の凹部２１ｂにカバーガラス２３を挿入する。さらに、防水シート部材２４をアイカップ本体２１の防水シート部材挿入用開口部２１ｅ側から挿入し、変形させながら溝部２１ｄに嵌め込む。この状態で、防水シート部材２４により、カバーガラス２３のアイカップ本体２１からの脱落が防止される。なお、この状態では、防水シート部材２４は、厚み、径方向で非圧縮状態である。
【００３０】
次に、図６（Ａ）に示すように接眼カバー１１の後端外周１１ｂ上の係合爪１１ｆに対してアイカップ本体２１の切り欠き２１ｆを挿入する。
【００３１】
そこで、アイカップ本体２１を反時計回り（図３のＤａ方向）に回動させると、防水シート部材２４の表面が接眼カバー１１の後端面１１ｃおよび突条１１ｄ上を摺動しながら相対的に移動する。そのとき、アイカップ本体２１の係合部２１ｇの先端曲面部２１ｊで係合爪１１ｆの斜面１１ｈを押圧するので、係合爪１１ｆは、相対的にアイカップ本体２１側に向けて移動し、かつ、アイカップ本体２１の凸部２１ｈに乗り上げる（図６（Ｂ））。この装着過程の状態では、防水シート部材２４は、接眼カバー１１の後端面１１ｃで非圧縮状態（図６（Ｂ）の状態２４Ｂ）から押圧され、弾性圧縮変形される。突条１１ｄが当接する環状部分は、さらに圧縮された状態（図６（Ｂ）の状態２４Ｃ）となっている。この圧縮量は、図６（Ｃ）に示す装着完了状態の圧縮量よりも多く圧縮された状態である。
【００３２】
続いて、さらにアイカップ本体２１を反時計回り（図３のＤａ方向）に回動させると、防水シート部材２４が接眼カバー１１の後端面上を摺動しながら相対的に移動し、係合爪１１ｆは、アイカップ本体２１の凸部２１ｈに乗り越えてアイカップ装着完了状態となる（図６（Ｃ））。この状態で係合爪１１ｆは、相対的にアイカップ本体２１の係合部２１ｇの当接面２１ｉと凸部２１ｈの間に嵌り込み、係合爪１１ｆの側面が係合部２１ｇの当接面２１ｉに当接して、係合爪１１ｆの前面１１ｇが係合部２１ｇの内面に当接する。従って、アイカップ３の反時計回り方向の回動操作は、当接面２１ｉと係合爪１１ｆが干渉して完全に回転規制される。さらに、アイカップ３の時計回り方向の回動操作は、凸部２１ｈが係合爪１１ｆによって所定のクリック保持力で回転規制される。すなわち、時計回りに回動操作すると、凸部２１ｈが係合爪１１ｆに乗り上げようとしてアイカップ本体２１が接眼カバー１１側に接近しようとする。この接近動作により防水シート部材２４が圧縮される方向に付勢され、アイカップ３の時計回り方向の回動操作に対してクリック力が生じる。
【００３３】
この装着完了状態では、防水シート部材２４の接眼カバー１１側は、図６（Ｂ）の圧縮状態よりわずかに戻され、接眼カバー１１の後端面１１ｃで圧縮され、密着状態に保持される。突条１１ｄが当接する防水シート部材２４の環状部分は、さらに圧縮された状態に保持される。一方、上記圧縮力を受けた防水シート部材２４のカバーガラス２３側は、カバーガラス２３の表面に圧接して密着する。特に防水シート部材２４の突条１１ｄが当接する後面側のカバーガラス面上の環状部分は、さらに強い圧接力で密着する。
【００３４】
従って、カバーガラス２３の内側表面（接眼レンズ側）と防水シート部材２４の間は、強く密着し、特に突条１１ｄの環状部分の対応部分には、高い接触圧が作用し、確実に防水状態に保持される。同様に、防水シート部材２４と接眼カバー１１の後端面１１ｃとの間も同様に強く密着し、特に突条１１ｄが当接する環状部分には、高い接触圧が作用し、確実に防水状態に保持される。また、防水シート部材１１自体もシール性を有していることからアイカップ３の外部に対して接眼カバー１１の内部は、防水上、確実に隔離された状態に保持される。
【００３５】
なお、接眼カバー１１に装着されたアイカップ３を取り外すには、装着状態にあるアイカップ本体２１を時計回り（図３の反Ｄａ方向）に所定のクリック力を越える力で回動操作する。その回動操作によって、接眼カバー１１の係合爪１１ｆが相対的にアイカップ本体２１の凸部２１ｈを乗り越えて移動し、切り欠き２１ｆの位置に係合爪１１ｆが位置する状態となり、アイカップ３を接眼カバー１１から外すことができる。
【００３６】
なお、本実施形態においては、接眼カバー１１の後端面１１ｃ及び突条１１ｄとが防水シート部材２４と当接するようにしてシール性を高めているが、少なくとも、接眼カバー１１側と防水シート部材２４とが全周にわたって密着するように構成すればよい。
【００３７】
以上、説明したように本実施形態のカメラにおいては、その接眼ユニット１の接眼カバー１１に着脱可能なアイカップ３に摺動性が良好で、へたりの少ないマイクロセルポリマーシートで形成された防水シート部材２４を適用し、その防水シート部材２４を接眼カバー側係合部の係合爪１１ｆとアイカップ本体側係合部２４ｇとの回動操作によって圧縮し、密着させる構造を採用している。従って、確実な密着状態が得られ、また、長期間にわたるシール性も確保される。また、防水シート部材２４の摺動性が良好であることから防水シート部材２４の圧縮を効率よく行うことができる。
【００３８】
さらに、一つの防水シート部材２４にて、接眼カバー１１とアイカップ３間からの水滴の侵入と、カバーガラス２３とアイカップ本体２１間からの水滴の侵入を防止することができる。また、防水シート部材２４及びカバーガラス２３を接着固定する必要がないことから、アイカップのコンパクト化が可能であり、組付けも容易であり、構成部品も少なくなる。
【００３９】
また、アイカップ３を接眼カバー１１に装着する場合、接眼カバー１１の係合爪にアイカップ本体２１の係合部を挿入して反時計回りに回動操作するだけで簡単に装着することができ、その装着状態では、アイカップ３は、確実に保持される。また、アイカップ３を取り外す場合は、アイカップ３を時計回りにクリック保持力を越えて回動操作することによりアイカップ本体２１の係合部を接眼カバー１１の係合爪から解放すれば、容易に取り外すことができる。しかも、アイカップ３の脱着操作時の節度感及び、アイカップ３が脱落しないように保持する保持力と、を得るために防水シート部材２４の弾性を利用しているため、係合爪を変形させる場合に比して小型化が容易である。
【００４０】
上述した実施形態においては、防水部材である防水シート部材２４の素材として高密度マイクロセルポリマーのシート材を適用したが、これに限らず、他の素材であって、シール性に優れ、摺動性も良好な弾性変形可能な発泡シート材やゴムシートを適用することも可能である。図７は、防水シート部材２４に対する変形例の防水シート部材の断面図である。この防水シート部材３１は、発泡シート材やゴムシートの両面に摺動性のよいフィルム３２を貼付したものであり、上述したアイカップ３の防水部材として適用できる。
【００４１】
また、アイカップ３に用いる光学素子としてカバーガラス２３を例にとって説明したが、その他、視度調整レンズなどを用いても良い。さらに、本実施形態においては防水して説明したが、これは防滴機能も含むものであり、所望の防水・防滴性能を得るためには、アイカップ３の装着状態での防水シート部材２４の圧縮量やその材質を変更すればよい。
【００４２】
【発明の効果】
上述のように本発明によれば、着脱可能なアイカップにおけるアイカップ本体に弾性防水部材を保持し、光学機器に設けられた係合爪とアイカップ本体に設けられた凹状の係合部との係合により、上記弾性防水部材を圧縮し、密着させる構造を採用したので、弾性防水部材を接着固定する必要が無く、組み付けも容易となり、また構成部品数を少なくすることが可能となる。
また、防水部材の弾性を利用をすることにより、係合爪を変形させる場合に比して、小型化が容易となる。
【図面の簡単な説明】
【図１】本発明の一実施形態の光学機器であるカメラのアイカップ装着状態でのファインダ接眼ユニットの断面図である。
【図２】図１のアイカップの分解斜視図である。
【図３】図１のファインダ接眼ユニットの接眼カバーとアイカップとの分解斜視図である。
【図４】図３のＢ−Ｂ断面図であって、上記接眼カバーの係合爪部の断面を示す。
【図５】図２のアイカップのアイカップ本体切り欠き部周りの形状を示す図であって、図５（Ａ）は、図２のＡ矢視の切り欠き部まわりの展開図を示し、図５（Ｂ）は、図５（Ａ）のＥ−Ｅ断面図である。
【図６】図２のアイカップの装着過程における図３のＣ矢視の展開図であり、図６（Ａ）は、アイカップを接眼カバーの係合爪部に挿入した状態を示し、図６（Ｂ）は、挿入後、アイカップをわずかに反時計回りに回動させた状態を示し、図６（Ｃ）は、アイカップを所定量だけ反時計回りに回動させた装着状態を示す。
【図７】図２のアイカップに適用される防水部材であえる防水シート部材の変形例の断面図である。
【符号の説明】
３ …アイカップ
１１ｄ…突条（防水部材を押圧する押圧部）
１１ｆ…係合爪（光学機器側係合部）
２１ …アイカップ本体
２１ｂ…円形凹部（光学素子を挿入するための開口）
２１ｄ…溝部（防水部材保持部）
２１ｇ…係合部（アイカップ側係合部）
２３ …カバーガラス（光学素子）
２４ …防水シート部材（防水部材）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to Aika' flop having a detachable waterproof the optics.
[0002]
[Prior art]
Conventionally, an eye cup disclosed in Patent Document 1 as an eye cup having a waterproof function that can be attached to and detached from an optical device can be smoothly attached to an eyepiece frame and can maintain airtightness. That is, the eye cup is provided with a sliding member made of metal or the like, and the sliding member is slid and brought into contact with the eyepiece frame on the camera body side to provide airtightness. Patent Document 1 proposes another eye cup in which the sliding member is attached to the eye cup in a cantilever shape and an O-ring is interposed between the eyepiece window and the sliding member. .
[0003]
[Patent Document 1]
Patent Document 1 is Japanese Patent Application Laid-Open No. 11-109442.
[0004]
[Problems to be solved by the invention]
In the eye cup proposed in Patent Document 1 described above, the airtightness between the sliding member and the eyepiece frame is ensured, but the airtightness between the sliding member and the eyecup is not particularly considered. . In addition, it has been proposed to attach the sliding member to the eye cup through an O-ring in the form of a cantilever. In this case, in order to maintain airtightness between the sliding member and the eye cup, Need to be glued.
[0005]
The present invention has been made to solve the above-mentioned problems, and in an eye cup having a waterproof function, it is easy to assemble without requiring adhesion or the like, and can be attached to and detached from an optical device having a reliable waterproof function. an object of the present invention is to provide a Aika'-flops.
[0006]
[Means for Solving the Problems]
A first eye cup of the present invention is an eye cup that can be attached to and detached from an optical device side engaging portion of an optical device having an engaging claw that protrudes in the outer peripheral direction, and is elastically deformable with the eye cup body. An elastic waterproofing member held by the eyecup main body, and provided in the eyecup main body closer to the optical device than the held elastic waterproofing member. A concave engaging portion that engages with the engaging claw disposed in the joint, a convex portion that protrudes toward the elastic waterproof member in the concave engaging portion, and a concave engaging portion. A convex portion that is arranged adjacently and into which the engaging claw is inserted, and wherein the engaging claw inserted into the notched portion is disposed in the concave engaging portion. When the relative movement toward the direction and the engaging claw rides on the convex portion, A rear end surface forming a part of the engaging part on the side of the school equipment compresses the elastic waterproofing member, thereby holding the elastic waterproofing member in close contact with the eyecup body, and the engaging claw is the convex part When the elastic waterproofing member is attached to the concave engaging portion after getting over, the rotation of the engaging claw is restricted by the convex portion.
[0007]
According to a second eye cup of the present invention, in the first eye cup, the concave engagement portion is configured such that when the engagement claw is attached to the concave engagement portion, the engagement claw A contact surface that contacts the contact surface, and when the engagement claw rotates to one side, the rotation is restricted by contacting the contact surface, and when the engagement claw rotates to the other side. The rotation is restricted by a click action of the convex portion and the engaging claw.
[0008]
According to a third eye cup of the present invention, in the first eye cup, an annular pressing portion is provided on a rear end surface forming a part of the optical device side engaging portion, and the pressing portion Thus, the amount of compression for compressing the elastic waterproof member is increased.
[0009]
A fourth eye cup of the present invention is an eye cup that can be attached to and detached from an optical device side engaging portion of an optical device having an engaging claw that protrudes in the outer peripheral direction, and includes an eye cup body and an eye cup body. An optical member held by the optical device, an elastically deformable seal member that is disposed closer to the optical device than the optical member, and the optical device more than the held elastic waterproof member. A concave engaging portion that is provided in the eye cup body on the side and engages with the engaging claw disposed on the optical device side engaging portion, and protrudes toward the elastic waterproof member at the concave engaging portion. And the concave engaging portion, and when the engaging claw is attached to the concave engaging portion, the contact surface that comes into contact with the engaging claw, and the concave shape A notch that is arranged adjacent to the engaging portion of the and into which the engaging claw is inserted The engaging claw inserted into the notch is rotated in the direction of the convex portion arranged in the concave engaging portion, and the engaging claw moves the convex portion. When riding up, the rear end surface forming a part of the optical device side engaging portion compresses the elastic waterproof member by a predetermined amount in the optical member direction, thereby bringing the elastic waterproof member into close contact with the optical member, and When the engaging claw gets over the convex portion and is attached to the concave engaging portion, the amount of compression of the elastic waterproof member is reduced, and the engaging portion is caused by the convex portion and the contact surface. It is characterized by restricting the rotation of the claw.
[0010]
According to a fifth eye cup of the present invention, in the first , third , and fourth eye cups, the elastic waterproofing member is formed of a microcell polymer sheet.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a finder eyepiece unit in a state where an eye cup is mounted on a camera which is an optical apparatus according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the eye cup. FIG. 3 is an exploded perspective view of the eyepiece cover and eyecup of the finder eyepiece unit. 4 is a cross-sectional view taken along the line BB of FIG. 3 and shows a cross section of the outer periphery of the rear end portion of the eyepiece cover. FIG. 5A is a development view taken along arrow A in FIG. 2 and shows the eye cup body notch portion of the eye cup, and FIG. 5B is a view taken along line EE in FIG. It is sectional drawing.
[0014]
In the following description, in the direction along the finder optical axis O, the pentaprism side is the front and the eyepoint side is the rear. The rotation direction is indicated by the rotation direction when viewed from the rear side.
[0015]
As shown in FIG. 1, the finder eyepiece unit 1 is inside the eyepiece cover 11 that is a part of the exterior cover of a camera that is an optical device, and is an in-finder display unit 5 on the exit side of the pentaprism 4 a of the finder unit 4. The metering unit 6 is arranged at the rear of the arrangement position. An eye cup 3 to be described later can be attached to and detached from a rear end portion 11a which is an eye cup mounting portion of the eyepiece cover 11.
[0016]
The finder eyepiece unit 1 has a finder optical axis Of, and is supported by the eyepiece unit main body 12 that holds the front eyepiece first group lens 13 and the eyepiece unit main body 12 so as to be movable back and forth. A second group eyepiece frame 14 that holds the eyepiece unit, a third group eyepiece frame 16 that is fixedly supported on the rear side of the eyepiece unit main body 12 and holds the eyepiece third group lens 17, and a diopter for driving the second group eyepiece frame 14 forward and backward. An adjustment ring 18 and a diopter adjustment biasing spring 19 that biases the second group eyepiece frame 14 are provided.
[0017]
The diopter adjustment ring 18 is provided with a cam portion 18a. When the ring 18 is rotated, the cam follower 14a of the second group eyepiece frame 14 is driven by the cam portion 18a, and the second group eyepiece frame 14 is moved to the viewfinder optical axis Of. Advancing and retreating along, diopter adjustment is performed.
[0018]
A third group eyepiece frame 16 having an eyepiece opening 16a is located in the rear end portion 11a of the eyepiece cover 11. Further, on the outer periphery 11b of the rear end portion of the eyepiece cover 11, as shown in FIG. 3, an engaging claw 11f serving as an optical device side engaging portion that protrudes outward along the rear end surface 11c is arranged at a position equally divided into three. Is done.
[0019]
The rear end portion outer periphery 11b has a dimension that can be fitted into an opening 21e on the front side of the eye cup body 21 described later. The three engaging claws 11f can be inserted into a notch 21f on the front opening 21e of the eyecup body 21 described later.
[0020]
Further, on the rear end surface 11c of the eyepiece cover 11, a protrusion 11d that slightly protrudes toward the eye cup side (rear side) is provided over the entire circumference as shown in FIG. The protrusion 11d has a semicircular cross section and is an annular pressing portion around the optical axis Of that presses the front surface of a waterproof sheet member 24 described later. The annular diameter is smaller than the outer diameter of the cover glass 23 described later.
[0021]
As shown in FIGS. 1 and 2, the eye cup 3 includes an eye cup body 21, a cover glass 23 that is a transparent optical element incorporated in the eye cup body 21, a waterproof sheet member 24 that is a waterproof member, and an eye cup body. And a rubber cover 22 mounted so as to cover the outer periphery of 21.
[0022]
The eye cup body 21 has a rear center opening 21a, and further has a circular recess 21b that is an opening for holding a cover glass in an inner peripheral portion, a groove portion 21d that is an inner peripheral groove-shaped waterproof sheet member holding portion, and a front surface. A waterproof sheet member insertion opening 21e on the side, a notch 21f arranged at a three-divided position on the opening 21e, and an engagement claw 11f of the eyepiece cover adjacent to the notch 21f can be engaged. 21g.
[0023]
The inner periphery of the recess 21 b is larger than the outer diameter of the cover glass 23, and the step of the recess is shallower than the thickness of the cover glass 23.
[0024]
The inner periphery of the opening 21 e is equal to or larger than the inner diameter of the recess 21 b and smaller than the outer diameter of the waterproof sheet member 24.
[0025]
The inner periphery of the bottom of the groove 21d is equal to or slightly larger than the outer diameter of the waterproof sheet member 24. Further, the groove width of the groove portion 21d is such that the thickness of the waterproof sheet member 24 is not compressed in a state where the cover glass 23 is inserted into the recess 21b and the waterproof sheet member 24 is inserted.
[0026]
As shown in FIGS. 2, 5A, and 5B, the concave engaging portion 21g formed on the front side from the groove width surface of the groove portion 21d is the clockwise side of the three cutout portions 21f (upper side in FIG. 2). Then, it is provided adjacent to each counterclockwise side). The engaging portion 21g serves as an eye cup side engaging portion with which the engaging claw 11f of the eyepiece cover 11 is engaged. On the side of the notch 21f in the circumferential direction of the engaging portion 21g, a convex portion 21h, which is a semicircular cross-sectional contact portion protruding rearward (waterproof sheet member side), is in contact with the opposite side of the convex portion 21h. 21i are provided.
[0027]
The waterproof sheet member 24 is an annular sheet member made of a microcell polymer sheet (for example, microcell urethane foam), which is a high-density foaming resin, and having an opening 24a at the center. This microcell polymer sheet has a very fine and uniform cell structure, low compression residual strain, stable sealability over a long period of time, and good surface slidability It is. The size of the opening 24 a is larger than the central opening 21 a of the eye cup body 21 and the rear outer diameter of the third group eyepiece frame 16 and smaller than the outer diameter of the cover glass 23. Moreover, the thickness of the waterproof sheet member 24 is set to a thickness that allows a sufficient compression allowance to satisfy the waterproof function when compressed.
[0028]
A mounting operation for mounting the eyecup 3 on the eyepiece cover 11 having the above-described configuration will be described with reference to FIGS.
FIG. 6 is a development view taken along the arrow C in FIG. 3 in the process of attaching the eyecup, and FIG. 6A shows a state in which the eyecup is inserted into the engaging claw portion of the eyepiece cover. FIG. 6B shows a state in which the eye cup is then rotated slightly counterclockwise (Da direction in FIG. 3). FIG. 6C shows a wearing state in which the eyecup is rotated counterclockwise by a predetermined amount.
[0029]
As shown in FIG. 3, the cover glass 23 is inserted into the recess 21b of the eye cup body 21 to which the rubber cover 22 is attached. Further, the waterproof sheet member 24 is inserted from the waterproof sheet member insertion opening 21e side of the eye cup body 21, and is fitted into the groove 21d while being deformed. In this state, the waterproof sheet member 24 prevents the cover glass 23 from falling off the eye cup body 21. In this state, the waterproof sheet member 24 is in an uncompressed state in the thickness and radial directions.
[0030]
Next, as shown in FIG. 6A, the notch 21f of the eye cup body 21 is inserted into the engaging claw 11f on the rear end outer periphery 11b of the eyepiece cover 11.
[0031]
Therefore, when the eyecup body 21 is rotated counterclockwise (Da direction in FIG. 3), the surface of the waterproof sheet member 24 is relatively moved while sliding on the rear end surface 11c and the protrusion 11d of the eyepiece cover 11. Moving. At that time, since the inclined surface 11h of the engaging claw 11f is pressed by the tip curved surface portion 21j of the engaging portion 21g of the eye cup body 21, the engaging claw 11f moves relatively toward the eye cup body 21 side, And it rides on the convex part 21h of the eyecup main body 21 (FIG. 6 (B)). In the state of this mounting process, the waterproof sheet member 24 is pressed from the non-compressed state (state 24B in FIG. 6B) on the rear end surface 11c of the eyepiece cover 11, and is elastically compressed and deformed. The annular portion with which the protrusion 11d abuts is in a further compressed state (state 24C in FIG. 6B). This compression amount is in a state of being compressed more than the compression amount in the mounting completion state shown in FIG.
[0032]
Subsequently, when the eyecup body 21 is further rotated counterclockwise (Da direction in FIG. 3), the waterproof sheet member 24 moves relatively while sliding on the rear end surface of the eyepiece cover 11, and is engaged. The claw 11f gets over the convex portion 21h of the eyecup body 21 and is in a state where the eyecup is completely attached (FIG. 6C). In this state, the engaging claw 11f is relatively fitted between the contact surface 21i of the engaging part 21g of the eye cup body 21 and the convex part 21h, and the side surface of the engaging claw 11f is in contact with the engaging part 21g. In contact with the surface 21i, the front surface 11g of the engaging claw 11f contacts the inner surface of the engaging portion 21g. Accordingly, the rotation operation of the eye cup 3 in the counterclockwise direction is completely restricted by the interference between the contact surface 21i and the engaging claw 11f. Further, in the clockwise rotation operation of the eye cup 3, the rotation of the convex portion 21h is restricted by the engagement claw 11f with a predetermined click holding force. In other words, when the clockwise rotation operation is performed, the eye cup body 21 tends to approach the eyepiece cover 11 side so that the convex portion 21h tries to ride on the engaging claw 11f. Due to this approaching action, the waterproof sheet member 24 is biased in the direction in which it is compressed, and a click force is generated for the clockwise rotation of the eye cup 3.
[0033]
In this attached state, the eyepiece cover 11 side of the waterproof sheet member 24 is slightly returned from the compressed state of FIG. 6B, is compressed by the rear end surface 11c of the eyepiece cover 11, and is held in close contact. The annular portion of the waterproof sheet member 24 with which the protrusion 11d abuts is held in a further compressed state. On the other hand, the cover glass 23 side of the waterproof sheet member 24 that has received the compressive force is in pressure contact with the surface of the cover glass 23. In particular, the annular portion on the cover glass surface on the rear surface side where the protrusion 11d of the waterproof sheet member 24 abuts is in close contact with a stronger pressing force.
[0034]
Therefore, the inner surface (eyepiece lens side) of the cover glass 23 and the waterproof sheet member 24 are in close contact with each other, and a high contact pressure acts on the corresponding portion of the annular portion of the protrusion 11d, so that the waterproof state is ensured. Retained. Similarly, the waterproof sheet member 24 and the rear end surface 11c of the eyepiece cover 11 are also in close contact with each other, and a high contact pressure acts on the annular portion where the protrusion 11d abuts, so that the waterproof sheet is reliably maintained in a waterproof state. Is done. Further, since the waterproof sheet member 11 itself also has a sealing property, the inside of the eyepiece cover 11 is kept in a state of being reliably isolated from the outside of the eyecup 3 for waterproofing.
[0035]
In order to remove the eyecup 3 attached to the eyepiece cover 11, the eyecup body 21 in the attached state is rotated clockwise (in the anti-Da direction in FIG. 3) with a force exceeding a predetermined click force. By the rotation operation, the engaging claw 11f of the eyepiece cover 11 moves relatively over the convex portion 21h of the eyecup body 21, and the engaging claw 11f is positioned at the position of the notch 21f. 3 can be removed from the eyepiece cover 11.
[0036]
In this embodiment, the sealing performance is improved by bringing the rear end surface 11c and the protrusion 11d of the eyepiece cover 11 into contact with the waterproof sheet member 24, but at least the eyepiece cover 11 side and the waterproof sheet member 24 are provided. May be configured so as to be in close contact with the entire circumference.
[0037]
As described above, in the camera according to the present embodiment, the eye cup 3 that can be attached to and detached from the eyepiece cover 11 of the eyepiece unit 1 is waterproof and is formed of a microcell polymer sheet that has good slidability and less sag. A structure is adopted in which the sheet member 24 is applied, and the waterproof sheet member 24 is compressed and brought into close contact with the engaging claw 11f of the eyepiece cover side engaging portion and the eye cup main body side engaging portion 24g. . Therefore, a reliable adhesion state is obtained, and a sealing property for a long period is also ensured. Moreover, since the sliding property of the waterproof sheet member 24 is good, the waterproof sheet member 24 can be efficiently compressed.
[0038]
Further, the single waterproof sheet member 24 can prevent water droplets from entering between the eyepiece cover 11 and the eye cup 3 and water droplets entering from between the cover glass 23 and the eye cup body 21. Further, since it is not necessary to bond and fix the waterproof sheet member 24 and the cover glass 23, the eyecup can be made compact, the assembly is easy, and the number of components is reduced.
[0039]
Further, when the eyecup 3 is attached to the eyepiece cover 11, the eyecup 3 can be easily attached only by inserting the engaging portion of the eyecup body 21 into the engaging claw of the eyepiece cover 11 and rotating it counterclockwise. The eyecup 3 is securely held in the mounted state. Further, when removing the eyecup 3, if the eyecup 3 is rotated clockwise beyond the click holding force to release the engaging portion of the eyecup body 21 from the engaging claw of the eyepiece cover 11, It can be easily removed. In addition, since the elasticity of the waterproof sheet member 24 is used to obtain a moderation feeling during the detaching operation of the eyecup 3 and a holding force to hold the eyecup 3 so as not to drop off, the engaging claw is deformed. The size can be easily reduced as compared with the case of making it.
[0040]
In the above-described embodiment, the high-density microcell polymer sheet material is applied as the material of the waterproof sheet member 24 which is a waterproof member. It is also possible to apply an elastically deformable foam sheet material or rubber sheet having good properties. FIG. 7 is a sectional view of a waterproof sheet member according to a modification of the waterproof sheet member 24. This waterproof sheet member 31 is obtained by attaching films 32 having good slidability on both surfaces of a foam sheet material or a rubber sheet, and can be applied as the waterproof member of the eye cup 3 described above.
[0041]
Further, the cover glass 23 has been described as an example of the optical element used for the eye cup 3, but a diopter adjustment lens or the like may be used. Furthermore, in the present embodiment, the waterproof sheet has been described, but this also includes a drip-proof function. In order to obtain a desired waterproof / drip-proof performance, the waterproof sheet member 24 with the eyecup 3 attached is provided. What is necessary is just to change the compression amount and its material.
[0042]
【The invention's effect】
As described above, according to the present invention, the elastic waterproof member is held on the eyecup body in the detachable eyecup, the engaging claw provided on the optical device, and the concave engaging portion provided on the eyecup body, By adopting a structure in which the elastic waterproofing member is compressed and brought into close contact with each other, there is no need to adhere and fix the elastic waterproofing member, the assembly becomes easy, and the number of components can be reduced.
Further, by utilizing the elasticity of the waterproof member, the size can be easily reduced as compared with the case where the engaging claw is deformed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a finder eyepiece unit in a state where an eye cup is mounted on a camera which is an optical apparatus according to an embodiment of the present invention.
2 is an exploded perspective view of the eye cup of FIG. 1. FIG.
3 is an exploded perspective view of an eyepiece cover and an eye cup of the finder eyepiece unit of FIG. 1; FIG.
4 is a cross-sectional view taken along line BB of FIG. 3, showing a cross section of the engaging claw portion of the eyepiece cover.
5 is a diagram showing the shape of the eyecup of FIG. 2 around the notch portion of the eyecup, and FIG. 5 (A) is a developed view around the notch portion of FIG. FIG. 5B is a cross-sectional view taken along the line E-E in FIG.
6 is a development view taken along arrow C in FIG. 3 in the process of attaching the eye cup in FIG. 2, and FIG. 6 (B) shows a state in which the eyecup is slightly rotated counterclockwise after insertion, and FIG. 6 (C) shows a wearing state in which the eyecup is rotated counterclockwise by a predetermined amount. Show.
7 is a cross-sectional view of a modified example of a waterproof sheet member that can be a waterproof member applied to the eyecup of FIG. 2;
[Explanation of symbols]
3 ... eye cup 11d ... ridge (pressing part that presses waterproofing member)
11f ... engaging claw (optical device side engaging portion)
21 ... Eye cup body 21b ... Circular recess (opening for inserting an optical element)
21d ... Groove (waterproof member holding part)
21g ... engaging part (eye cup side engaging part)
23 ... Cover glass (optical element)
24. Waterproof sheet member (waterproof member)

Claims

An eye cup that can be attached to and detached from an optical device side engaging portion of an optical device having an engaging claw that protrudes in the outer peripheral direction,
The eyecup body,
An elastically deformable member having a sealing property, the elastic waterproof member held by the eye cup body;
A concave engaging portion that is provided in the eye cup body closer to the optical device than the held elastic waterproof member and engages with the engaging claw disposed on the optical device engaging portion;
A convex portion arranged to protrude toward the elastic waterproof member in the concave engaging portion;
A notch portion disposed adjacent to the concave engagement portion and into which the engagement claw is inserted;
Comprising
When the engaging claw inserted into the notch relatively moves toward the convex portion arranged in the concave engaging portion and the engaging claw rides on the convex portion, the optical claw A rear end surface that forms a part of the device side engaging portion compresses the elastic waterproofing member to hold the elastic waterproofing member in a close contact state with respect to the eyecup body,
When the engaging claw gets over the convex part and is attached to the concave engaging part, the contact state of the elastic waterproofing member is reduced and the engaging claw is rotated by the convex part. An eye cup characterized by regulation.

The concave engaging portion further has a contact surface that comes into contact with the engaging claw when the engaging claw is attached to the concave engaging portion,
When the engaging claw rotates to one side, the rotation is regulated by contacting with the abutting surface, and when the engaging claw rotates to the other side, the click action of the convex portion and the engaging claw The eye cup according to claim 1, wherein the rotation is restricted by the step.

The rear end surface forming a part of the optical device side engaging portion is provided with a pressing portion arranged in an annular shape, and the compression amount for compressing the elastic waterproof member by the pressing portion is increased. The eye cup according to claim 1.

An eye cup that can be attached to and detached from an optical device side engaging portion of an optical device having an engaging claw that protrudes in the outer peripheral direction,
The eyecup body,
An optical member held by the eyecup body,
An elastically deformable seal member that is elastically deformable and disposed closer to the optical device than the optical member;
A concave engaging portion that is provided in the eye cup body closer to the optical device than the held elastic waterproof member and engages with the engaging claw disposed on the optical device engaging portion;
A convex portion arranged to protrude toward the elastic waterproof member in the concave engaging portion;
In the concave engaging portion, when the engaging claw is attached to the concave engaging portion, a contact surface that comes into contact with the engaging claw;
A notch portion disposed adjacent to the concave engagement portion and into which the engagement claw is inserted;
Comprising
When the engaging claw inserted into the notch rotates and moves in the direction of the convex portion disposed in the concave engaging portion, and the engaging claw rides on the convex portion, the optical claw A rear end surface forming a part of the device side engaging portion compresses the elastic waterproofing member by a predetermined amount in the optical member direction, thereby bringing the elastic waterproofing member into close contact with the optical member,
When the engaging claw gets over the convex part and is attached to the concave engaging part, the amount of compression of the elastic waterproof member is reduced, and the convex part and the contact surface An eye cup that restricts rotation of the engaging claw.

The eyecup according to claim 1, 3 or 4, wherein the elastic waterproofing member is formed of a microcell polymer sheet.