JP3801671B2

JP3801671B2 - Synchro contact mechanism of focal plane shutter

Info

Publication number: JP3801671B2
Application number: JP29130695A
Authority: JP
Inventors: 利久斉藤; 眞司伊藤
Original assignee: Nidec Copal Corp
Current assignee: Nidec Precision Corp
Priority date: 1995-11-09
Filing date: 1995-11-09
Publication date: 2006-07-26
Anticipated expiration: 2015-11-09
Also published as: JPH09133945A

Description

【０００１】
【発明の属する技術分野】
本発明は、カメラ用フォーカルプレンシャッタにおいてシャッタ羽根の走行とフラッシュ装置の発光時機を同期させるシンクロ接点機構に関する。
【０００２】
【従来の技術】
最近のフォーカルプレンシャッタは、シャッタ羽根の走行速度が速くなってきたため、シンクロ接点の閉じ精度を得ることが一段と難しくなってきた。他方、シャッタの低コスト化が要求されており、シンクロ接点機構についても部品点数及び工数の削減が不可欠になってきた。シンクロ接点機構においてこのような問題点を解決するためには、接点部材を操作する側と接点部材側の両面から検討を加える必要がある。
【０００３】
フォーカルプレンシャッタの先・後羽根は、夫々複数枚の羽根を複数のアームに枢支した羽根群として構成されている。そして、通常は、先羽根群を走行させる先羽根駆動部材がシンクロ接点機構を操作している。しかしながら、先羽根駆動部材自身の形状公差や先羽根駆動部材の支軸との嵌合公差等の関係で、先羽根駆動部材の一部であれば、接点部材をどの部分で操作してもよいというものではない。
【０００４】
また、最近のフォーカルプレンシャッタは電磁石を備えていることもあってプリント配線板を取り付けるようにしているが、リード線を出来るだけ使用したくないことと、組立作業上、電気関連部品をユニット化したいという観点から、接点部材をプリント配線板に半田付けするのが普通となっている。しかしながら、先羽根駆動部材はシャッタ地板に取り付けられ、接点部材はプリント配線板に取り付けていることから、組立時に両者の位置合わせが問題となる。
【０００５】
これらの点を克服したシンクロ接点機構が、実開平４−６１３２７号公報に開示されている。この従来例によれば、先羽根駆動部材は、先羽根群のアームとの連結ピンの近傍位置で、接点部材を操作している。言うまでもなく、先羽根駆動部材は、先羽根群に対し所定の走行作動を行わせるためのものであるから、ピンの作動が所定の軌跡に沿って行われなければならない。従って、先羽根駆動部材の軸位置から該ピン位置までの寸法は、設計上は勿論のこと、組立調整上も高精度に保たれている。そのため、この線上の近傍位置であり且つ該軸位置から出来るだけ離れた位置で接点部材を操作することが理想的である。また、この従来例によれば、二つの接点部材をシャッタ地板に取り付けている。そのため、組立時における先羽根駆動部材との位置調整が行い易くなっている。
【０００６】
【発明が解決しようとする課題】
しかるに、上記の従来例におけるシンクロ接点機構は、二つの接点部材が、共に弾性を有する細長い接片部材として構成され、各接片部材の一方の端部はシャッタ地板に取り付けられ、他方の端部は完全な自由端となっているため、それらの自由端はいずれも自己の弾性の中立状態にあり、通常の材質，板厚で構成すると、振動，衝撃等には極めて不安定なものとなってしまう。そのため、撮影時には、ミラー機構の作動による振動等に影響され、シンクロ接点の閉じ時機が変わったり、チャタリングを起こす虞があるという問題がある。また、二つの接点部材が、共に独立した部品として構成され、シャッタ地板に個々に取り付けられるため、部品点数と工数の点で有利とは言えない。
【０００７】
本発明は、このような問題点を解決するためになされたものであり、その目的とするところは、二つの接点の閉じ時機を安定して得ることができ、且つ部品点数が少なく低コストなカメラ用フォーカルプレンシャッタのシンクロ接点機構を提供することである。
【０００８】
【課題を解決するための手段】
上記の目的を達成するために、本発明は、露光走行時に、先羽根駆動部材と先羽根群との連結位置近傍部で先羽根駆動部材がシンクロ接点の閉じ操作を行うようにしたカメラ用フォーカルプレンシャッタにおいて、二つの接点部材のうち、一方の接点部材は、弾性を有する細長い接片部材として構成され、その一方の端部をシャッタ地板に取り付け、他方の自由端をシャッタ地板に設けた規制部に対し自己の弾性力で圧接するようにして配置され、他方の接点部材は、前記先羽根駆動部材に巻装されていてその一端を該先羽根駆動部材に掛けている先羽根駆動バネの他端位置を調整可能に取り付けた板部材の一部とし、露光走行時には、前記連結位置近傍部が前記自由端に接触し、前記弾性力に抗して押すように構成する。
【０００９】
また、本発明におけるカメラ用フォーカルプレンシャッタのシンクロ接点機構は、好ましくは、前記シャッタ地板が合成樹脂製であって、前記規制部が前記シャッタ地板と一体成形されているようにする。
【００１０】
また、本発明におけるカメラ用フォーカルプレンシャッタのシンクロ接点機構は、好ましくは、前記他方の接点部材が、前記先羽根駆動バネであって、露光走行時には、該バネの前記一端が前記一方の接点部材の自由端に接触し、前記弾性力に抗して押すように構成する。
更に、本発明におけるカメラ用フォーカルプレンシャッタのシンクロ接点機構は、好ましくは、露光走行時には、前記先羽根群の羽根を枢着しているアームが前記一方の接点部材の自由端に接触し、前記弾性力に抗して押すように構成する。
【００１１】
【発明の実施の形態】
本発明の実施の形態を、各々図１乃至図３に示した三つの実施例について説明する。各図はいづれも分解斜視図である。また、各実施例は共通する部品が多いので、実質的に同じ部品、部位には同じ符号を付けて説明する。
【００１２】
第１実施例
図１において、合成樹脂製のシャッタ地板１には露光用のアパーチャ１ａと円弧状のスロット１ｂ，１ｃが形成され、且つ軸１ｄ，１ｅ，１ｆが一体成形にて立設されている。軸１ｄ，１ｅ，１ｆには、夫々シャッタ地板１側から間座部，大径部，小径部が形成され、軸１ｄ，１ｅの小径部の先端には軸方向にネジ穴が形成されている。更に、シャッタ地板１には、その表面側に突き出た台部１ｇと規制部１ｈが一体成形で形成され、また孔１ｉも形成されている。
【００１３】
上記した台部１ｇには、シンクロ接点の一方の接点を構成する接片部材２がインサート加工により取り付けてある。この接片部材２は略Ｌ字形のものを寝かせたように配置しており、台部１ｇから左方へ延びた部分を接片２ａとし、上方へ延びた部分を接続用の端子２ｂとしている。接片２ａは弾性を有しており、常態において自由端２ａ₁を上記の規制部１ｈに圧接させている。更に、この接片２ａには被押動部２ａ₂と接点部２ａ₃が設けられている。
【００１４】
軸１ｄ，１ｅの大径部には先羽根駆動部材３，後羽根駆動部材４が、夫々回転可能に取り付けられている。各駆動部材３，４は合成樹脂製であり、夫々筒部３ａ，４ａ、鉄片取付部３ｂ，４ｂ、ピン３ｃ，４ｃが一体成形にて形成され、鉄片取付部３ｂ，４ｂには、電磁石に吸着される鉄片５，６が取り付けられている。また、先羽根駆動部材３には、筒部３ａとピン３ｃを結ぶ線の近傍位置であって、ピン３ｃの外径と同じか又はそれよりも大きく形成された円弧状の押動部３ｄが形成されている。
【００１５】
上記のピン３ｃ，４ｃは、スロット１ｂ，１ｃを貫通して、シャッタ地板１の背面側で、図示していない周知の先羽根群と後羽根群に連結しており、先羽根駆動部材３と後羽根駆動部材４が順次、時計方向へ回動することによって各羽根群に露光走行を行わせるようになっている。また、軸１ｆの大径部にはセットレバー７が回転可能に取り付けられている。このセットレバー７は、フィルムの巻き上げに連動して時計方向に回転し、先羽根駆動部材３，後羽根駆動部材４を、夫々の背面に設けられた図示していない周知の係合部（ローラ等）を押すことによって、セット位置まで反時計方向へ回転させるようになっている。
【００１６】
軸１ｄ，１ｅの小径部にはラチェット歯車８，９が回転可能に取り付けられている。先羽根駆動部材３と後羽根駆動部材４の筒部３ａ，４ａには、駆動バネ１０，１１が緩く巻装されており、周知のようにして、一端は各々先羽根駆動部材３，後羽根駆動部材４に形成された図示していないバネ掛けに、他端は各々ラチェット歯車８，９に掛けられている。電磁石用の取付板１２とプリント配線板１３は、重ね合わされて、夫々の孔１２ａ，１３ａを軸１ｄの小径部に、孔１２ｂ，１３ｂを軸１ｅの小径部に、また孔１２ｃ，１３ｃを軸１ｆの小径部に嵌合させ、その後、軸１ｄ，１ｅの先端に形成されたネジ穴にビス１４，１５を螺合させることによって、取り付けられている。
【００１７】
取付板１２は金属製であって、折り曲げ加工によって、ラチェット爪１２ｄ，１２ｅ、接片１２ｆ、端子１２ｇが形成されている。ラチェット爪１２ｄ，１２ｅはラチェット歯車８，９に噛合するようになっていて、その噛合を外した状態でラチェット歯車８，９を回転させ、駆動バネ１０，１１の力を調整した後、再度噛合させて該歯車８，９が回転しないようにするものである。尚、駆動バネ１０，１１の調整機構には、ラチェット歯車８，９やラチェット爪１２ｄ，１２ｅを用いることなく、取付板１２の穴１２ａを中心として同一円周状に複数のバネ掛け孔を設け、駆動バネ１０，１１の一端を所定の力が得られる位置の孔に掛けるようにしたものがあり、本発明はそのようなものにも適用される。
【００１８】
取付板１２に形成された接片１２ｆは、その先端が下方へ延び、シャッタ地板１の孔１ｉに嵌合している。そして、その状態において、接片１２ｆの接点部１２ｆ₁は、接片２ａの接点部２ａ₃に対向している。また、取付板１２に形成された端子１２ｇはプリント配線板１３の孔１３ｄに挿入され半田付けされており、他方、接片部材２の端子２ｂはプリント配線板１３の孔１３ｅに挿入され半田付けされている。
【００１９】
先羽根制御用の電磁石と後羽根制御用の電磁石は、夫々略Ｕ字形をした鉄芯１６，１７と、該鉄芯１６，１７の一方の脚部を嵌合させるボビン１８，１９と、該ボビン１８，１９に巻回されたコイル２０，２１とで構成され、該コイル２０，２１の各一対の端子ピン２０ａ，２１ａはボビン１８，１９に圧入され、その先端はプリント配線板１３の各一対の孔１３ｆ，１３ｇに挿入され半田付けされている。また、鉄芯１６，１７は、取付板１２の折曲部に固定された鉄芯取付座２２，２３にビス２４，２５によって取り付けられている。
【００２０】
次に、本実施例の作動を説明する。先羽根駆動部材３と後羽根駆動部材４は、セット位置において鉄片５，６を、鉄芯１６，１７の脚部の端面に押し当てている。しかし、コイル１８，１９には通電されておらず、磁気的に吸着されていない。この状態において、接片部材２の接片２ａは、自己の弾性によって自由端２ａ₁を規制部１ｈに押し当てている。そのため、接片２ａは極めて安定状態にあり、多少の振動があっても動かない。他方、取付板１２の接片１２ｆの先端は孔１ｉに嵌合しているので、振動があっても動けない。従って、両接点部２ａ₃，１２ｆ₁は所定の間隔を維持され、不慮の接触は起こり得ない。
【００２１】
シャッタがレリーズされると、先ず電磁石のコイル２０，２１に通電され、鉄芯１６，１７が鉄片５，６を吸着する。そして、セットレバー７は反時計方向へ復帰する。その後、コイル２０への通電が断たれると、先羽根駆動部材３は駆動バネ１０によって時計方向へ回動し、ピン３ｃによって図示していない先羽根群を走行させ、アパーチャ１ａを開放していく。先羽根群がアパーチャ１ａを全開する直前になると、先羽根駆動部材３の押動部３ｄが接片２ａの被押動部２ａ₂を押し、接点部２ａ₃を接点部１２ｆ₁に接触させる。
【００２２】
その結果、フラッシュが発光し、先羽根群が全開となったとき、その光量がピークとなる。このとき、押動部３ｄは予め付与されている偏倚力に抗して接片２ａを押すため、チャタリングの生じる虞が全くなく、しかも接片１２ｆの先端は孔１ｉに嵌合しているので、両接点部２ａ₃，１２ｆ₁間の接点圧が充分に得られる。その後、被写体の測光値に応じて所定の時間が経過すると、コイル２１への通電が断たれ、後羽根駆動部材４が駆動バネ１１によって時計方向へ回動され、ピン４ｃが後羽根群を走行させ、アパーチャ１ａを閉鎖させる。
【００２３】
尚、本実施例においては、露光走行時に、先羽根駆動部材３の押動部３ｄが接片２ａの被押動部２ａ₂を押し、その接点部２ａ₃を接片１２ｆの接点部１２ｆ₁に接触させているが、先羽根駆動部材３の押動部３ｄによらず、先羽根群を構成している部材、例えば羽根を枢着し支持しているアームによって接片２ａを押し、接点部２ａ₃を接点部１２ｆ₁に接触させるようにしてもよい。そのようにする場合の構成例を二つ説明すると、先ず第１の例は、規制部１ｈの近傍位置においてシャッタ地板１に孔を形成し、自由端２ａ₁を下方に延長して先端部を該孔に貫通させ、該アームの作動軌跡内に臨ませるようにすればよい。その場合には、該孔の内壁面が上記の規制部１ｈの役目をすることになる。しかし、必要があれば本実施例と同じように、シャッタ地板１の表面側に突き出るようにした規制部を形成しても構わず、或いはシャッタ地板１の裏面側だけに形成しても、更には表裏両方に形成してもよく、自由端２ａ₁の倒れ等を防止する点で有利である。また、第２の例としては、接片部材２をシャッタ地板１の背面に配置し、接片２ａを該アームの作動軌跡内に臨ませると共に、規制部１ｈをシャッタ地板１の背面に形成するようにすればよい。その場合には、端子２ｂの先端部は、折り曲げるか、シャッタ地板１を貫通させるかして、シャッタ地板１の表面側に位置させるようにする。
【００２４】
第２実施例
図２に示された第２実施例は、その構成部品の殆どが第１実施例の場合と同じであるため、異なる構成についてのみ説明する。従って、ここで説明する内容以外については、第１実施例の説明内容が本実施例にも適用される。先ず、本実施例においては、取付板１２に接片１２ｆが設けられていない。そのため、シャッタ地板１に孔１ｉが形成されていない。また本実施例においては、第１実施例における接片部材２の被押動部２ａ ₂ が一方の接点部となる。
【００２５】
また、本実施例における先羽根駆動部材３３は、筒部３３ａ，鉄片取付部３３ｂ，ピン３３ｃが基板部３３ｄと別部品で製作されたものであり、且つ基板部３３ｄにはバネ掛け３３ｅが設けられている。基板部３３ｄは、ピン３３ｃの近傍位置の形状が第１実施例の場合と全く同じであるが、第１実施例における押動部（３ｄ）は接点部３３ｄ₁として形成されている。そして、このような構成のうち、基板部３３ｄとバネ掛け３３ｅが金属製である。
【００２６】
また、駆動バネ１０はもとよりラチェット歯車８も金属製である。そして、駆動バネ１０の一端はバネ掛け３３ｅに掛けられている。そのため、基板部３３ｄの接点部３３ｄ₁は、駆動バネ１０，ラチェット歯車８，取付板１２を介して、プリント配線板１３に電気的に接続されている。第１実施例の説明においても述べたように、ラチェット歯車８，ラチェット爪１２ｄを設けないようにした場合には、駆動バネ１０から直接、取付板１２に接続されることになる。
【００２７】
次に、本実施例の作動を説明する。セット状態においては、第１実施例の場合と同じように、接片部材２の接片２ａは、自己の弾性によって自由端２ａ₁を規制部１ｈに押し当てている。そのため、接片２ａは極めて安定状態にあり、多少の振動があっても動かない。シャッタがレリーズされると、コイル２０，２１に通電され、セットレバー７は反時計方向へ復帰する。その後、コイル２０への通電が断たれると、先羽根駆動部材３３は時計方向へ回動し、ピン３３ｃによって図示していない先羽根群を走行させ、アパーチャ１ａを開放していく。
【００２８】
先羽根群がアパーチャ１ａを全開する直前になると、先羽根駆動部材３３の押動部即ち接点部３３ｄ₁が接片２ａの被押動部即ち接点部２ａ₂に接触し、フラッシュを発光させる。このとき、押動部即ち接点部３３ｄ₁は予め付与されている偏倚力に抗して接片２ａを押すため、チャタリングの生じる虞が全くなく、しかも両接点部３３ｄ₁，２ａ₂間の接点圧を充分に得ることができる。その後、コイル２１への通電が断たれ、後羽根駆動部材４がそのピン４ｃによって後羽根群を走行させ、アパーチャ１ａを閉鎖させる。
【００２９】
第３実施例
図３に示された第３実施例は、その構成部品の殆どが第２実施例の場合と同じであり、異なるのは先羽根駆動部材４３の構成と駆動バネ４０の形状だけである。従って、ここで説明する内容以外については、第２実施例の説明内容が本実施例にも適用される。先ず、本実施例の先羽根駆動部材４３は合成樹脂製であって、筒部４３ａ，鉄片取付部４３ｂ，ピン４３ｃ，バネ掛け４３ｄが一体成形にて形成されている。本実施例においては、先羽根駆動部材４３に、接片部材２に対する押動部を形成していない。その代わり、バネ掛け４３ｄに掛ける駆動バネ４０の一端が円弧状に曲げられ、押動部兼接点部４０ａを形成している。
【００３０】
本実施例の作動は、第２実施例の場合と殆ど同じであるが、簡単に説明すると、セット状態においては、第１及び第２実施例の場合と同じように、接片部材２の接片２ａは、自己の弾性によって自由端２ａ₁を規制部１ｈに押し当てている。そのため、接片２ａは極めて安定状態にあり、多少の振動があっても動かない。シャッタがレリーズされ、セットレバー７が反時計方向へ復帰した後、コイル２０への通電が断たれると、先羽根駆動部材４３は時計方向へ回動し、ピン４３ｃによって図示していない先羽根群を走行させ、アパーチャ１ａを開放していく。
【００３１】
先羽根群がアパーチャ１ａを全開する直前に駆動バネ４０の押動部兼接点部４０ａが接片２ａの被押動部即ち接点部２ａ₂に接触し、フラッシュを発光させる。このとき、押動部兼接点部４０ａは予め付与されている偏倚力に抗して接片２ａを押すため、チャタリングの生じる虞が全くなく、しかも両接点部４０ａ，２ａ₂間の接点圧を充分に得ることができる。その後、コイル２１への通電が断たれると、後羽根駆動部材４のピン４ｃが後羽根群を走行させ、アパーチャ１ａを閉じさせる。
【００３２】
【発明の効果】
上記のように、本発明は、シンクロ接点を構成する二つの接点部材のうち少なくとも一方の接点部材が弾性を有する細長い接片部材として構成され、該接片部材の自由端はシャッタ地板に設けられた規制部に対し自己の弾性力で圧接するようにして配置されているので、安定した閉じ作動が行え、しかも他方の接点部材を他の機能部品と兼用させるようにできるので部品点数及び工数の削減が可能となる。
【図面の簡単な説明】
【図１】本発明の第１実施例の分解斜視図である。
【図２】本発明の第２実施例の分解斜視図である。
【図３】本発明の第３実施例の分解斜視図である。
【符号の説明】
１シャッタ地板
１ｇ台部
１ｈ規制部
１ｉ孔
２接片部材
２ａ，１２ｆ接片
２ａ₁ 自由端
２ａ₂ 被押動部
２ａ₃，１２ｆ₁，３３ｄ₁，４０ａ接点部
２ｂ，１２ｇ端子
３，３３，４３先羽根駆動部材
３ａ，４ａ，３３ａ，４３ａ筒部
３ｂ，４ｂ，３３ｂ，４３ｂ鉄片取付部
３ｃ，４ｃ，３３ｃ，４３ｃピン
３ｄ押動部
４後羽根駆動部材
５，６鉄片
８，９ラチェット歯車
１０，１１，４０駆動バネ
１２取付板
１２ｄ，１２ｅラチェット爪
１３プリント配線板
３３ｄ基板部
３３ｅ，４３ｄバネ掛け[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synchro contact mechanism that synchronizes the travel of shutter blades and the light emission timing of a flash device in a focal plane shutter for a camera.
[0002]
[Prior art]
In recent focal plane shutters, since the traveling speed of the shutter blades has increased, it has become more difficult to obtain the close accuracy of the synchro contact. On the other hand, it is required to reduce the cost of the shutter, and it has become indispensable to reduce the number of parts and man-hours for the synchro contact mechanism. In order to solve such a problem in the synchro contact mechanism, it is necessary to consider both the contact member operating side and the contact member side.
[0003]
The front and rear blades of the focal plane shutter are each configured as a blade group in which a plurality of blades are pivotally supported by a plurality of arms. Usually, the leading blade driving member that travels the leading blade group operates the synchro contact mechanism. However, the contact member may be operated at any part as long as it is a part of the leading blade driving member due to the shape tolerance of the leading blade driving member itself and the fitting tolerance with the spindle of the leading blade driving member. It's not that.
[0004]
In addition, recent focal plane shutters are equipped with electromagnets so that printed wiring boards are attached. However, as much as possible to avoid using lead wires, and assembling work, electric related parts are unitized. From the viewpoint of wanting to do so, it is common to solder the contact member to the printed wiring board. However, since the leading blade driving member is attached to the shutter base plate and the contact member is attached to the printed wiring board, the positioning of the two becomes a problem during assembly.
[0005]
A synchro contact mechanism that overcomes these points is disclosed in Japanese Utility Model Publication No. 4-61327. According to this conventional example, the leading blade driving member operates the contact member at a position near the connecting pin with the arm of the leading blade group. Needless to say, since the leading blade driving member is for causing the leading blade group to perform a predetermined traveling operation, the operation of the pin must be performed along a predetermined locus. Therefore, the dimension from the axial position of the leading blade driving member to the pin position is maintained with high accuracy not only in design but also in assembly adjustment. Therefore, it is ideal to operate the contact member at a position near this line and as far as possible from the axis position. Further, according to this conventional example, the two contact members are attached to the shutter base plate. Therefore, it is easy to adjust the position with the leading blade drive member during assembly.
[0006]
[Problems to be solved by the invention]
However, in the synchro contact mechanism in the above-described conventional example, the two contact members are each configured as an elongated contact piece member having elasticity, and one end portion of each contact piece member is attached to the shutter base plate, and the other end portion. Since these are completely free ends, all of these free ends are in their own elastic neutral state, and if they are made of normal materials and plate thickness, they are extremely unstable against vibrations and shocks. End up. For this reason, there is a problem that during photographing, there is a possibility that the timing of closing the synchro contact may change or chattering may occur due to vibrations caused by the operation of the mirror mechanism. Further, since the two contact members are both configured as independent parts and individually attached to the shutter base plate, it cannot be said that it is advantageous in terms of the number of parts and the number of man-hours.
[0007]
The present invention has been made in order to solve such problems. The object of the present invention is to stably obtain a timing for closing two contact points, and to reduce the number of parts and the cost. To provide a synchro contact mechanism of a focal plane shutter for a camera.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a focal point for a camera in which the leading blade driving member performs a closing operation of the sync contact in the vicinity of the connection position between the leading blade driving member and the leading blade group during exposure running. in Purenshatta, Chi caries two contact members, hand contact member is constructed as an elongated contact piece member having elasticity, attach the one end of it to the shutter base plate, a shutter and the other free end to regulating unit digits set in the base plate are arranged so as to press by its own elastic force, the other contact member is multiplied by its one end to the tip blade driving member is wound around the leading blade driving member The other end position of the leading blade drive spring is made part of a plate member that can be adjusted, and during exposure running, the vicinity of the connecting position is in contact with the free end and is pushed against the elastic force. .
[0009]
Further, in the synchro contact mechanism of the focal plane shutter for a camera according to the present invention, preferably, the shutter base plate is made of a synthetic resin, and the restriction portion is integrally formed with the shutter base plate.
[0010]
Further, in the synchro contact mechanism of the focal plane shutter for a camera according to the present invention, preferably, the other contact member is the leading blade drive spring , and the one end of the spring is the one contact member during exposure running. It is configured to contact the free end and push against the elastic force.
Further, the synchro contact mechanism of the focal plane shutter for a camera according to the present invention is preferably configured such that, during exposure running , an arm pivotally attached to the blade of the leading blade group contacts the free end of the one contact member, It is configured to push against the elastic force.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to three examples shown in FIGS. Each figure is an exploded perspective view. Since each embodiment has many common parts, the same reference numerals are given to the substantially same parts and parts.
[0012]
First Embodiment In FIG. 1, an aperture 1a for exposure and arc-shaped slots 1b, 1c are formed on a shutter base plate 1 made of synthetic resin, and shafts 1d, 1e, 1f are erected by integral molding. Yes. The shafts 1d, 1e, and 1f are respectively formed with a spacer portion, a large diameter portion, and a small diameter portion from the shutter base plate 1 side, and screw holes are formed in the axial direction at the tips of the small diameter portions of the shafts 1d and 1e. . Further, the shutter base plate 1 is formed with a base portion 1g and a restricting portion 1h protruding on the surface side, and is also formed with a hole 1i.
[0013]
A contact piece member 2 constituting one contact of the sync contact is attached to the above-described base portion 1g by insert processing. This contact piece member 2 is arranged so that a substantially L-shaped member is laid down, a portion extending leftward from the base portion 1g is a contact piece 2a, and a portion extending upward is a connection terminal 2b. . Contact piece 2a has elasticity, and the free end 2a ₁ is pressed against the restricting portion 1h of the in a normal state. Further, the contact piece 2a is provided with a driven portion 2a ₂ and a contact portion 2a ₃ .
[0014]
A leading blade driving member 3 and a trailing blade driving member 4 are rotatably attached to the large diameter portions of the shafts 1d and 1e, respectively. Each drive member 3 and 4 is made of synthetic resin, and cylindrical portions 3a and 4a, iron piece attachment portions 3b and 4b, and pins 3c and 4c are formed by integral molding, and the iron piece attachment portions 3b and 4b are electromagnets. The iron pieces 5 and 6 to be adsorbed are attached. Further, the leading blade driving member 3 has an arcuate pushing portion 3d formed in the vicinity of the line connecting the cylindrical portion 3a and the pin 3c and having the same diameter as or larger than the outer diameter of the pin 3c. Is formed.
[0015]
The pins 3c and 4c pass through the slots 1b and 1c and are connected to a well-known front blade group and rear blade group (not shown) on the back side of the shutter base plate 1, The trailing blade driving member 4 sequentially rotates clockwise to cause each blade group to perform exposure running. A set lever 7 is rotatably attached to the large diameter portion of the shaft 1f. The set lever 7 rotates in the clockwise direction in conjunction with the winding of the film. Etc.) is rotated counterclockwise to the set position.
[0016]
Ratchet gears 8 and 9 are rotatably attached to the small diameter portions of the shafts 1d and 1e. Driving springs 10 and 11 are loosely wound around the cylindrical portions 3a and 4a of the leading blade driving member 3 and the trailing blade driving member 4, and as is well known, one end is the leading blade driving member 3 and the trailing blade, respectively. The other ends of the spring hooks (not shown) formed on the drive member 4 are hooked on ratchet gears 8 and 9, respectively. The electromagnet mounting plate 12 and the printed wiring board 13 are overlapped so that the holes 12a and 13a are the small diameter part of the shaft 1d, the holes 12b and 13b are the small diameter part of the shaft 1e, and the holes 12c and 13c are the shafts. The screws 14 and 15 are attached to the screw holes formed at the tips of the shafts 1d and 1e after being fitted to the small diameter portion of 1f.
[0017]
The mounting plate 12 is made of metal, and ratchet claws 12d and 12e, contact pieces 12f, and terminals 12g are formed by bending. The ratchet pawls 12d and 12e are meshed with the ratchet gears 8 and 9. After the meshing is disengaged, the ratchet gears 8 and 9 are rotated to adjust the force of the drive springs 10 and 11, and then mesh again. Thus, the gears 8 and 9 are prevented from rotating. The adjustment mechanism for the drive springs 10 and 11 is provided with a plurality of spring hooking holes in the same circumference around the hole 12a of the mounting plate 12 without using the ratchet gears 8 and 9 and the ratchet claws 12d and 12e. There is one in which one end of each of the drive springs 10 and 11 is put in a hole at a position where a predetermined force can be obtained, and the present invention is also applied to such a case.
[0018]
The contact piece 12f formed on the mounting plate 12 has a tip extending downward and is fitted in the hole 1i of the shutter base plate 1. In this state, the contact portion 12f ₁ of the contact piece 12f faces the contact portion 2a ₃ of the contact piece 2a. The terminal 12g formed on the mounting plate 12 is inserted into the hole 13d of the printed wiring board 13 and soldered, while the terminal 2b of the contact piece member 2 is inserted into the hole 13e of the printed wiring board 13 and soldered. Has been.
[0019]
An electromagnet for leading blade control and an electromagnet for trailing blade control include iron cores 16 and 17 each having a substantially U shape, bobbins 18 and 19 for fitting one leg portion of the iron cores 16 and 17, The coils 20 and 21 are wound around the bobbins 18 and 19, and a pair of terminal pins 20 a and 21 a of the coils 20 and 21 are press-fitted into the bobbins 18 and 19. The pair of holes 13f and 13g are inserted and soldered. The iron cores 16 and 17 are attached to the iron core attachment seats 22 and 23 fixed to the bent portion of the attachment plate 12 by screws 24 and 25.
[0020]
Next, the operation of this embodiment will be described. The leading blade driving member 3 and the trailing blade driving member 4 press the iron pieces 5 and 6 against the end surfaces of the legs of the iron cores 16 and 17 at the set position. However, the coils 18 and 19 are not energized and are not magnetically attracted. In this state, the contact piece 2a of the contact piece member 2 presses the free end 2a ₁ against the restricting portion 1h by its own elasticity. Therefore, the contact piece 2a is extremely stable and does not move even if there is some vibration. On the other hand, since the tip of the contact piece 12f of the mounting plate 12 is fitted in the hole 1i, it cannot move even if there is vibration. Therefore, the two contact portions 2a ₃ and 12f ₁ are maintained at a predetermined interval, and no accidental contact can occur.
[0021]
When the shutter is released, the electromagnet coils 20 and 21 are first energized, and the iron cores 16 and 17 attract the iron pieces 5 and 6. Then, the set lever 7 returns counterclockwise. After that, when the coil 20 is de-energized, the leading blade driving member 3 is rotated clockwise by the driving spring 10, and the leading blade group (not shown) is driven by the pin 3c to open the aperture 1a. Go. When the first blade groups is just before the fully open aperture 1a, the pressing portion 3d of the leading blade driving member 3 pushes the target pushing portion 2a ₂ of the contact piece 2a, contacting the contact portion 2a ₃ to the contact portion 12f _1.
[0022]
As a result, when the flash is emitted and the leading blade group is fully opened, the light amount reaches a peak. At this time, since the pushing portion 3d pushes the contact piece 2a against the biasing force applied in advance, there is no possibility of chattering, and the tip of the contact piece 12f is fitted in the hole 1i. The contact pressure between the contact points 2a ₃ and 12f ₁ is sufficiently obtained. Thereafter, when a predetermined time elapses according to the photometric value of the subject, the coil 21 is de-energized, the trailing blade driving member 4 is rotated clockwise by the driving spring 11, and the pin 4c travels the trailing blade group. And close the aperture 1a.
[0023]
In the present embodiment, at the time of exposure driving, pushing portion 3d of the leading blade driving member 3 pushes the target pushing portion 2a ₂ of the contact piece 2a, the contact portion 12f ₁ of the contact piece 12f that contact portions 2a ₃ The contact piece 2a is pushed by a member constituting the leading blade group, for example, an arm pivotally attached to and supporting the blade, regardless of the pushing portion 3d of the leading blade driving member 3. The part 2a ₃ may be brought into contact with the contact part 12f ₁ . Two configuration examples in such a case will be described. First, in the first example, a hole is formed in the shutter base plate 1 at a position in the vicinity of the restricting portion 1h, and the free end 2a ₁ is extended downward so that the tip portion is formed. What is necessary is just to make it penetrate to this hole and to face in the operating locus of this arm. In that case, the inner wall surface of the hole serves as the restricting portion 1h. However, if necessary, as in the present embodiment, a restricting portion that protrudes to the front surface side of the shutter base plate 1 may be formed, or may be formed only on the back surface side of the shutter base plate 1. May be formed on both the front and back sides, which is advantageous in preventing the free end 2a ₁ from falling over. Further, as a second example, the contact piece member 2 is disposed on the back surface of the shutter base plate 1 so that the contact piece 2a faces the operating locus of the arm, and the restricting portion 1h is formed on the back surface of the shutter base plate 1. What should I do? In that case, the tip of the terminal 2b is bent or penetrated through the shutter base plate 1 so as to be positioned on the surface side of the shutter base plate 1.
[0024]
Second Embodiment In the second embodiment shown in FIG. 2, most of the components are the same as those in the first embodiment, and therefore only different configurations will be described. Accordingly, the contents described in the first embodiment are also applied to this embodiment except for the contents described here. First, in the present embodiment, the contact piece 12 f is not provided on the mounting plate 12. Therefore, the hole 1i is not formed in the shutter base plate 1. In this embodiment, the pushed portion 2a ₂ of the contact piece member 2 in the first embodiment is one contact portion.
[0025]
Further, the leading blade driving member 33 in the present embodiment has a cylindrical portion 33a, an iron piece mounting portion 33b, and a pin 33c manufactured separately from the substrate portion 33d, and the substrate portion 33d is provided with a spring hook 33e. It has been. Substrate portion 33d is the shape of the vicinity of the pin 33c is exactly the same as in the first embodiment, pressing portion in the first embodiment (3d) is formed as a contact portion 33d _1. In such a configuration, the substrate portion 33d and the spring hook 33e are made of metal.
[0026]
The drive spring 10 and the ratchet gear 8 are also made of metal. One end of the drive spring 10 is hung on a spring hook 33e. Therefore, the contact portion 33d ₁ of the board portion 33d is electrically connected to the printed wiring board 13 via the drive spring 10, the ratchet gear 8, and the mounting plate 12. As described in the description of the first embodiment, when the ratchet gear 8 and the ratchet pawl 12d are not provided, the drive spring 10 is directly connected to the mounting plate 12.
[0027]
Next, the operation of this embodiment will be described. In the set state, as in the case of the first embodiment, the contact piece 2a of the contact piece member 2 presses the free end 2a ₁ against the restricting portion 1h by its own elasticity. Therefore, the contact piece 2a is extremely stable and does not move even if there is some vibration. When the shutter is released, the coils 20 and 21 are energized and the set lever 7 returns counterclockwise. Thereafter, when the coil 20 is de-energized, the leading blade driving member 33 rotates clockwise, and the leading blade group (not shown) is driven by the pin 33c to open the aperture 1a.
[0028]
When the first blade groups is just before the fully open aperture 1a, the pressing portion or the contact portion 33d ₁ of the leading blade driving member 33 is in contact with the pressing portion, that contacts 2a ₂ of the contact piece 2a, to the flash. At this time, since the pushing portion, that is, the contact portion 33d ₁ pushes the contact piece 2a against the biasing force applied in advance, there is no possibility of chattering, and the contact between the contact portions 33d ₁ and 2a ₂ A sufficient pressure can be obtained. Thereafter, the power supply to the coil 21 is cut off, and the trailing blade driving member 4 causes the trailing blade group to travel by the pin 4c to close the aperture 1a.
[0029]
Third Embodiment The third embodiment shown in FIG. 3 is almost the same as the second embodiment except for the configuration of the leading blade drive member 43 and the shape of the drive spring 40. It is. Accordingly, the contents described in the second embodiment are also applied to this embodiment except for the contents described here. First, the leading blade driving member 43 of the present embodiment is made of synthetic resin, and a cylindrical portion 43a, an iron piece mounting portion 43b, a pin 43c, and a spring hook 43d are integrally formed. In the present embodiment, the leading blade driving member 43 is not formed with a pushing portion with respect to the contact piece member 2. Instead, one end of the drive spring 40 to be hung on the spring hook 43d is bent in an arc shape to form a pushing portion / contact portion 40a.
[0030]
The operation of the present embodiment is almost the same as that of the second embodiment. However, in brief, in the set state, as in the case of the first and second embodiments, the contact member 2 is contacted. piece 2a is pressed against the free end 2a ₁ to the restriction portion 1h by its own elasticity. Therefore, the contact piece 2a is extremely stable and does not move even if there is some vibration. After the shutter is released and the set lever 7 returns to the counterclockwise direction, when the coil 20 is de-energized, the leading blade drive member 43 rotates clockwise and the leading blade (not shown) is pinned by the pin 43c. Run the group and open the aperture 1a.
[0031]
Pushing portion and the contact portion 40a of the drive spring 40 immediately before the first blade groups is fully opened the aperture 1a is in contact with the pressing portion, that contacts 2a ₂ of the contact piece 2a, to the flash. At this time, to push the pushing portion and the contact portion 40a is contact piece 2a against the biasing force which is previously applied, it is without any possibility of occurrence of chattering, yet both contact portions 40a, the contact pressure between 2a ₂ It can be obtained sufficiently. Thereafter, when the coil 21 is de-energized, the pin 4c of the trailing blade driving member 4 travels the trailing blade group and closes the aperture 1a.
[0032]
【The invention's effect】
As described above, in the present invention, at least one of the two contact members constituting the synchro contact is configured as an elongated contact piece member having elasticity, and the free end of the contact piece member is provided on the shutter base plate. Since it is arranged so as to be in pressure contact with the regulating part with its own elastic force, stable closing operation can be performed, and the other contact member can also be used as another functional part, so the number of parts and man-hours can be reduced. Reduction is possible.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a second embodiment of the present invention.
FIG. 3 is an exploded perspective view of a third embodiment of the present invention.
[Explanation of symbols]
1 shutter base plate 1g base portion 1h regulating portion 1i hole 2 contact piece member 2a, 12f contact piece 2a ₁ free end 2a ₂ the pushing portion 2a _3, 12f _1, 33d _1, 40a contacts 2b, 12 g terminals 3,33, 43 Lead blade drive members 3a, 4a, 33a, 43a Tube portions 3b, 4b, 33b, 43b Iron piece mounting portions 3c, 4c, 33c, 43c Pin 3d Pushing portion 4 Rear blade drive members 5, 6 Iron pieces 8, 9 Ratchet gear 10, 11, 40 Drive spring 12 Mounting plate 12d, 12e Ratchet claw 13 Printed wiring board 33d Board part 33e, 43d Spring hook

Claims

During exposure run, in the camera focal plane shutter as the front curtain drive member by a connecting position vicinity of a leading blade driving member and the leading blade group to perform closing operation of the synchronous contacts, Chi caries two contact members, one square contact member is constructed as an elongated contact piece member having elasticity, attach the one end of it to the shutter base plate, the other free end by its own elastic force to regulating unit digits set in the shutter base plate The other contact member is disposed so as to be in pressure contact , and the other end position of the leading blade driving spring which is wound around the leading blade driving member and has one end hooked on the leading blade driving member is adjustable. and a part of the plate member, at the time of exposure driving, in contact with the connecting position vicinity is the free end, sink camera focal plane shutter, characterized by being configured to press against the elastic force Contact mechanism.

The synchro contact mechanism of a focal plane shutter for a camera according to claim 1, wherein the shutter base plate is made of synthetic resin, and the restricting portion is integrally formed with the shutter base plate.

The other contact member is the leading blade driving spring, and during exposure running, the one end of the spring contacts the free end of the one contact member and pushes against the elastic force. The synchro contact mechanism of a focal plane shutter for a camera according to claim 1 or 2.

2. The exposure apparatus according to claim 1, wherein an arm pivotally attached to the blade of the leading blade group is in contact with a free end of the one contact member and is pushed against the elastic force during exposure. 3. A synchro contact mechanism of a focal plane shutter for a camera according to 2.