Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1984-10-12
1986-12-02
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315151, 315159, 354416, 354417, H05B 3700, H05B 3900, H05B 4114
Patent
active
046267484
ABSTRACT:
An electronic flash of series controlled type is provided. It comprises a series connection of a flash discharge tube and a main thyristor, which series connection is further connected in series with a thyristor which forms a reverse charging path for a commutating capacitor. The series combination of the flash discharge tube, the main thyristor and the last mentioned thyristor is connected in parallel with a main capacitor. A diode is connected in series with the commutating capacitor so that their series combination is in parallel with the reverse charging thyristor. The reverse charging thyristor is rendered conductive as the main thyristor is rendered conductive so as to establish a reverse charging path for the commutating capacitor therethrough when a commutating operation is to be performed. This prevents a reverse charging current to the commutating capacitor from passing through the flash discharge tube, thus enabling an accurate control over the amount of exposure produced by flashlight.
REFERENCES:
patent: 3849703 (1974-11-01), Shimamura et al.
patent: 4298826 (1981-11-01), Nakayama
patent: 4344020 (1982-08-01), Horinishi
patent: 4522479 (1985-06-01), Yamada et al.
Chatmon Saxfield
Olympus Optical Company Ltd.
Weinstein Louis
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