Electronic flash device

Details Electronic flash device Electronic flash device

1974-07-29

1978-02-14

Dahl, Lawrence J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315151, 315159, H05B 3700

Patent

active

040741710

ABSTRACT:
The invention relates to an electronic flash device which is provided with a series arrangement of an electronic flash tube and a thyristor, which flash device is equipped with a flash duration limiter (computer electronic flash device).
According to the invention a rectifier is connected anti-parallel to the thyristor. As a result a smaller thyristor can be used, while the energy consumption can be reduced and an unwanted "light spike" at the end of the flash duration can be avoided.

REFERENCES:
patent: RE28025 (1974-05-01), Murata et al.
patent: 3332074 (1967-07-01), Arnold
patent: 3740610 (1973-06-01), Roncke
patent: 3814985 (1974-06-01), Pecher et al.
patent: 3849703 (1974-11-01), Shimamura et al.
patent: 3953783 (1976-04-01), Peters, Jr.
"Capacitor Turn-Off Circuits" -- SCR Manual, Second Edition (General Electric), pp. 73-75, 1961.

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