Safety device for camera

Details Safety device for camera Safety device for camera

1979-08-29

1980-12-02

Gellner, Michael L.

354289, G03B 1738, G03B 1718

Patent

active

042368022

ABSTRACT:
A safety device for preventing non exposure of film in a camera having a count switch which is normally closed prior to shutter release operation, the switch being opened after the shutter release operation begins to enable a timing circuit to start operating. In a preferred embodiment, the device includes a NOR gate having an input connected to one side of the count switch, and its output connected to the set terminal of a flip-flop which enables the shutter release operation. Another input of the NOR gate is connected to a differentiation circuit which provides an output signal when the shutter release button on the camera is actuated. This circuit arrangement operates so that the flip-flop is not set if the count switch is accidently in an open state when the release button is actuated. The shutter release operation is thereby prevented until the count switch is restored to working order.

REFERENCES:
patent: 3628437 (1971-12-01), Fahlenberg
patent: 4001843 (1977-01-01), Ellin
patent: 4181417 (1980-01-01), Sugiura et al.

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