FOCAL PLANE SHUTTER

• Main Authors: ITO HISAAKI, SAITO YUKI, KAWAKUBO NAOKI
• Format: Patent
• Language: English; Japanese
• Published: 02.12.2021
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS

To increase the degree of freedom in design of a prevention mechanism to improve durability.SOLUTION: A focal plane shutter comprises: a second rear driving member 620B that is connected with a rear blade and is pushed by a first rear driving member 620A to rotate, thereby causing the rear blade to run; and a prevention mechanism 91 that can make a transition between a prevention state for preventing a bound of the second rear driving member 620B at the completion of exposure running and a retracted state for not preventing the bound. In a charge operation, after a rear charge member 855 starts to rotate the first rear driving member 620A to a charge position, a front charge member 82 makes the prevention mechanism 91 to transition to the retracted state, and an urging force of an urging spring 54 urging in the direction of the first rear driving member 620A moves the second rear driving member 620B.SELECTED DRAWING: Figure 18 【課題】抑止機構の設計自由度を増し、耐久性を向上させる。【解決手段】後羽根に連結され、第１の後駆動部材６２０Ａにより押動されて回動することで後羽根を走行させる第２の後駆動部材６２０Ｂと、露光走行完了時に第２の後駆動部材６２０Ｂのバウンドを抑止する抑止状態とバウンドを抑止しない退避状態とを遷移可能な抑止機構９１とを備え、チャージ動作において、後チャージ部材８５５による第１の後駆動部材６２０Ａのチャージ位置への回動開始後に、先チャージ部材８２によって抑止機構９１が退避状態に遷移し、第１の後駆動部材６２０Ａに向けて付勢する付勢バネ５４の付勢力によって第２の後駆動部材６２０Ｂを移動させることを特徴とするフォーカルプレンシャッタ。【選択図】図１８