Electronic flash

Details Electronic flash Electronic flash

1978-04-26

1980-01-29

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315159, 315241P, 354 33, 354 60F, 354139, 354145, H05B 4132, H04B 4136

Patent

active

041863283

ABSTRACT:
An electronic flash of the type incorporating the so-called variable guide number device or a flash duration control device for controlling the quantity of a flash of light emitted from a flash lamp. In an integrating circuit of the variable guide number device diodes are used so that their forward bias characteristics may be utilized for the accurate control of a flash duration.

REFERENCES:
patent: 3710701 (1973-01-01), Takishima et al.
patent: 3823410 (1974-07-01), Tokutomi et al.

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