Patent
1975-09-26
1977-09-06
Adams, Russell E.
354137, 354238, 354256, 354266, G03B 958
Patent
active
040472116
ABSTRACT:
A mechanical exposure controlling means for electric shutters comprising a front blade actuating lever, a rear blade actuating lever, and a mechanical exposure controlling lever and bulb controlling lever which can be brought to a position in which they are engageable with the rear blade actuating lever so that, when said mechanical exposure controlling is brought to the position in which it is engageable with the rear blade actuating lever, an exposure may be made only at a specific shutter speed and, when said bulb controlling lever is brought to the position in which it is engageable with the rear blade actuating lever, a bulb exposure may be made. When the mechanical exposure controlling lever and bulb controlling lever are brought to the position in which they can be engaged with the rear blade actuating lever, the exposure time controlling circuit will be cut off from the current source battery.
REFERENCES:
patent: 3623409 (1971-11-01), Uno et al.
patent: 3670635 (1972-06-01), Ort
patent: 3731601 (1973-05-01), Matsuzaki
patent: 3829877 (1974-08-01), Kitai
patent: 3833915 (1974-09-01), Tanaka et al.
patent: 3893143 (1975-07-01), Taguchi et al.
patent: 3922693 (1975-11-01), Matsui
Inoue Nobuyoshi
Shimizu Munetaka
Adams Russell E.
Copal Company Limited
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