Optics: motion pictures – Removable film strip magazine type
Patent
1975-01-23
1976-07-20
Hix, L. T.
Optics: motion pictures
Removable film strip magazine type
352121, 352169, 352174, 354254, G03B 908, G03B 1726, G03B 2138
Patent
active
039710530
ABSTRACT:
An electromagnetic trigger device for use with camera capable of automatic time exposure, comprises: a power supply; a motor; a trigger switch; shutter driving means driven by said motor for driving a shutter and movable between a fully closed position and a fully open position, said shutter driving means fully opening the shutter when it is at the fully open position and fully closing the shutter when it is at the fully closing position; engaging means movable between a latching position and a non-latching position, said engaging means being adapted, when moved to said latching position, to latch said shutter driving means which occupies one of the fully open and closing positions; a motor switch which is closed for electrically connecting said motor to said power supply, when said engaging means is in said non-latching position; a starting coil for attracting said engaging means, when energized, to move said engaging means to said non-latching position; a switching circuit for connecting said starting coil to said power supply when turned on; a starting capacitor connected to said power supply so as to be charged when said trigger switch is opened and connected to said switching circuit to render said circuit conductive when said trigger switch is closed; reset means for rendering said switching means non-conductive for a predetermined period during an interval beginning with the closing operation of said trigger switch, said predetermined lapse interval being shorter than the shorter of the time interval required for said shutter driving means to move from the fully closed position to the fully open position and the time interval required for said driving means to move from the fully open position to the fully closed position; and a charging circuit for charging said starting capacitor connected to said switching circuit after said reset means has turned off said switching circuit, said switching circuit being turned on when said starting capacitor is charged to a predetermined voltage by said charging circuit.
REFERENCES:
patent: 3598480 (1971-08-01), Kubota et al.
patent: 3603678 (1971-09-01), Anderl et al.
patent: 3767298 (1973-10-01), Reinsch
Hix L. T,.
LaBarre James
Nippon Kogaku K.K.
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