Photography – With object illumination for exposure – With power supply detail
Patent
1999-05-25
2000-07-18
Perkey, W. B.
Photography
With object illumination for exposure
With power supply detail
396203, G03B 1505
Patent
active
06091906&
ABSTRACT:
In a flash device, a three-terminal switch is provided for connecting or disconnecting between a secondary coil of an oscillating transformer and a base of an oscillating transistor, between the secondary coil of the oscillating transformer and a triggering capacitor, and between the triggering capacitor and a primary coil of a triggering transformer. When the three-terminal switch is turned on, a biasing current is supplied to the base of the oscillating transistor, so a current flows through a primary coil of the oscillating transformer, and a secondary current from the secondary coil of the oscillating transformer is supplied to the main capacitor through the three-terminal switch and a base-emitter circuit of the oscillating transistor, to charge the main capacitor. The secondary current is also supplied to the triggering capacitor through the three-terminal switch, to charge the triggering capacitor. When a triggering switch is turned on while the three-terminal switch is on, the triggering capacitor discharges current through the primary coil of the triggering transformer, generating a triggering voltage for a flash discharge tube. If the three-terminal switch is turned off, the biasing current and the secondary current are cut from the oscillating transistor, and the triggering capacitor cannot discharge.
REFERENCES:
patent: 4260231 (1981-04-01), Kawarada
patent: 4430602 (1984-02-01), Ohmori
patent: 5966552 (1999-10-01), Hata
patent: 5974267 (1999-10-01), Motomura
patent: 6035141 (2000-03-01), Constable
Fuji Photo Film Co. , Ltd.
Perkey W. B.
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