Electronic flash with automatic duration control

Details Electronic flash with automatic duration control Electronic flash with automatic duration control

1978-07-12

1980-09-23

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315241P, H05B 4132

Patent

active

042245559

ABSTRACT:
In an electronic flash of the type having a main flash capacitor, a trigger circuit, a flash lamp which is ignited by a trigger voltage from the trigger circuit and flashed by the discharge of electrical energy stored in the main flash capacitor, a light reception circuit for integrating the amount of light reflected back from a subject and a flash duration control circuit or a flash interruption circuit actuable when the amount of light integrated by the light reception circuit reaches a predetermined level, a DC power source is connected to the light reception circuit through a switching means which is enabled or closed in response to the flashing of the flash lamp, whereby the erratic operation of the light reception circuit due to the integration of light other than the flash of light reflected from the subject may be avoided.

REFERENCES:
patent: 3754162 (1973-08-01), Katayama
patent: 3783336 (1974-01-01), Vital et al.
patent: 3808500 (1974-04-01), Ludloff
patent: 3818266 (1974-06-01), Vital et al.

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