Photography – Camera detail – Shutter
Patent
1997-06-23
2000-06-06
Lee, Eddie C.
Photography
Camera detail
Shutter
396465, 396470, 396484, 396489, G03B 908, G03B 940
Patent
active
060710195
ABSTRACT:
In a shutter device having a first driving lever which engages a shutter blade and which is given an urging force by a first spring and a second driving lever which is given an urging force by a second spring and which pushes the first driving lever from behind during an exposure action, the shutter device comprises a charge mechanism which, after the exposure action is performed by the shutter blade, causes the first spring and the second spring to be overcharged by moving the first driving lever and the second driving lever to an overcharging position and which, after that, returns to an initial position, wherein the first driving lever and the second driving lever are arranged to be moved from the overcharging position to an exposure start position by the urging forces of the first spring and the second spring, and wherein, after moving the first driving lever and the second driving lever to the overcharging position, the charge mechanism is urged toward the initial position by the urging force of the second spring obtained while the second driving lever is being moved from the overcharging position to the exposure start position.
REFERENCES:
patent: 4245905 (1981-01-01), Takayama
patent: 4259001 (1981-03-01), Watanabe et al.
patent: 4739355 (1988-04-01), Saito
patent: 4994834 (1991-02-01), Watabe et al.
patent: 5749014 (1998-05-01), Shimada
Canon Denshi Kabushiki Kaisha
Lee Eddie C.
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