Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1992-09-11
1993-10-05
Adams, Russell E.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
354416, 3541451, 315241P, G03B 1505, H05B 4114
Patent
active
052509770
ABSTRACT:
An electronic flash unit being effective in emitting light repeatedly at high speed by boosting an applying voltage between main electrodes of a flash discharge tube twice or more as much as a charged voltage in a main capacitor connected parallel to a high voltage DC power source, wherein the electronic flash device has a plurality of boosting capacitors connected with the flash discharge tube through plural second control switches respectively and a common circuit including an insulated gate bipolar transistor IGBT, the main capacitor and a first control switch for selective excitations, and also connected with a primary winding of a trigger transformer via a trigger capacitor, a diode and so on for charges during being un-excited, and wherein the electronic flash device has a switch control device for selectively turning on one of the plural second switches and for simultaneously turning on the first switch so as to supply a high voltage to the flash discharge tube being combined with the charged voltages of the boosting capacitors and the main capacitor after second et seq light emission operations.
REFERENCES:
patent: 4309092 (1982-01-01), Kitagawa
patent: 4717861 (1988-01-01), Yuasa et al.
patent: 4839686 (1989-06-01), Hosomizu et al.
patent: 5075714 (1991-12-01), Hagiuda et al.
patent: 5159381 (1992-10-01), Harrison
patent: 5180953 (1993-01-01), Hirata et al.
patent: 5187410 (1993-02-01), Shimizu et al.
Adams Russell E.
Noh Jae N.
West Electric Co. Ltd.
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