Single use camera with flash charging circuit

Details Single use camera with flash charging circuit Single use camera with flash charging circuit

1997-03-27

1998-06-02

Mathews, Alan A.

Photography

Disposable or recyclable camera

396176, 396206, G03B 1505, G03B 1702

Patent

active

057615411

ABSTRACT:
A single use camera having an electronic flash assembly including a flash charging circuit and a flash illumination circuit is provided with one or more access openings in the camera cover. The access openings are aligned with contact terminals in the flash charging circuit to allow insertion of a shorting device that acts to disable operation of the flash charging circuit. This is useful during a film loading operation to prevent charging of the flash capacitor which might otherwise be caused by electrostatic start up of the flash charging circuit. Preventing operation of the flash charging circuit in preference to shorting of the flash capacitor directly preserves battery power and assures the flash charging transistors will not be damaged by attempting to charge into a short circuited flash capacitor.

REFERENCES:
patent: Re34168 (1993-01-01), Ohmura et al.
patent: 3958258 (1976-05-01), Beach
patent: 4369395 (1983-01-01), Stempeck
patent: 5353079 (1994-10-01), Sakai et al.
patent: 5506646 (1996-04-01), Dunsmore et al.
patent: 5565943 (1996-10-01), Muramatsu et al.
patent: 5634153 (1997-05-01), Constable

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