1975-08-01
1977-05-17
O'Connor, Edna M.
354209, 354204, G03B 1902, G03B 1742
Patent
active
040245519
ABSTRACT:
A double-exposure proof camera includes a manual film advance and a solenoid which opens and closes the shutter with energization and de-energization of the solenoid. The solenoid is connected through a thyrister and a semi-conductor switch to a battery, the semi-conductor switch being closed and opened at the initiation and termination of a time interval determined by an RC network whose resistance component is controlled by a scene exposed photosensitive element. The thyrister gate is connected through a series connected pair of switches to a capacitor, one switch being closed with the depression of a shutter release member and the other switch being closed and opened respectively with a film frame being in exposure position and the film frame being advanced to discharge. The capacitor is connected to the battery through a pair of parallel switches, one of which is manually closeable and the other is closed during the advance of the film. A single exposure per film frame is only permitted, except when the manual switch is closed to permit continuous capacitor charging and multiple exposure of a single frame.
REFERENCES:
patent: 3611900 (1971-10-01), Kitai
patent: 3705338 (1972-12-01), Tsujimoto et al.
patent: 3754455 (1973-08-01), Tsujimoto et al.
patent: 3759156 (1973-10-01), Kobou
patent: 3763755 (1973-10-01), Kuramoto
patent: 3820141 (1974-06-01), Aizawa
patent: 3882516 (1975-05-01), Ogiso et al.
patent: 3909835 (1975-09-01), Ito et al.
Minolta Camera Kabushiki Kaisha
O'Connor Edna M.
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