Flash device and lens-fitted photo film unit with built-in...

Details Flash device and lens-fitted photo film unit with built-in... Flash device and lens-fitted photo film unit with built-in...

2005-09-06

2005-09-06

Perkey, W. B. (Department: 2851)

Photography

With object illumination for exposure

With power supply detail

Reexamination Certificate

active

06941070

ABSTRACT:
A charging circuit includes an oscillation transformer and an oscillation transistor. The oscillation transistor oscillates at a secondary current returned from a secondary coil in the charging circuit. The oscillation transistor increases/decreases a primary current, which flows from a battery to a primary coil, and flows the secondary current through the secondary coil to charge a main capacitor. The oscillation transistor, which satisfies the following conditions, is used: a DC current gain hFE1is 500±10 when a collector-emitter voltage VCEis 2V and a collector current ICis 0.5 A, and a DC current gain hFE2is 290±10 when the collector-emitter voltage VCEis 2V and the collector current ICis 5 A.

REFERENCES:
patent: 6339679 (2002-01-01), Aratame et al.
patent: 6404990 (2002-06-01), Isozaki et al.

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