Lens-fitted photo film unit, flash device, and lens-fitted...

Photography – Disposable or recyclable camera

Reexamination Certificate

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Details

C396S198000

Reexamination Certificate

active

07082263

ABSTRACT:
A flash device for a lens-fitted photo film unit pre-loaded with unexposed photo film is provided. A main capacitor stores charge. A flash emitter emits flash light. A flash circuit board charges the main capacitor, and drives the flash emitter by discharging the main capacitor in response to an exposing operation. A tightly closed flash case is secured to the lens-fitted photo film unit, for containing the main capacitor, the flash emitter and the flash circuit board. Also, the lens-fitted photo film unit includes a sync switch for generating a trigger signal in response to the exposing operation. Two switch contact points are disposed outside the flash case, for receiving the trigger signal from the sync switch. The two switch contact points disable discharge of the main capacitor while the flash case is away from the lens-fitted photo film unit, and are short-circuited for discharge of the main capacitor upon supply of the trigger signal while the flash case is secured to the lens-fitted photo film unit.

REFERENCES:
patent: 3783757 (1974-01-01), Wagner et al.
patent: 3943532 (1976-03-01), De Filippis
patent: 3969736 (1976-07-01), Lehmann
patent: 4406533 (1983-09-01), Yamamoto
patent: 4801957 (1989-01-01), Vandemoere
patent: 5003330 (1991-03-01), Kotani et al.
patent: 5079584 (1992-01-01), Nakamura
patent: 5172031 (1992-12-01), Matsui et al.
patent: 6044227 (2000-03-01), Hata
patent: 6351608 (2002-02-01), Constable
patent: 6466741 (2002-10-01), Uchiyama
patent: 6608969 (2003-08-01), Schroder
patent: 2003/0034693 (2003-02-01), Wareham et al.
patent: 7-120883 (1995-05-01), None

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