Auxiliary electronic flash apparatus

Details Auxiliary electronic flash apparatus Auxiliary electronic flash apparatus

1978-03-13

1979-05-15

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315153, 315155, 315159, 315241P, 315324, 354131, 354145, 250214SF, H05B 4132

Patent

active

041550293

ABSTRACT:
An auxiliary electronic flash apparatus coactuable with a main electronic flash apparatus of the type having a first flash lamp for converting the energy stored on a first main capacitor into light for illuminating a subject, and a control circuit for turning off the first flash lamp when the light emitted from the first flash lamp and reflected back from the subject reaches a predetermined amount. The auxiliary electronic flash apparatus includes a photometric circuit responsive only to the light emitted from the first flash lamp within a predetermined light wavelength range for generating a flash start signal in response to which a second flash lamp in the auxiliary electronic flash apparatus is turned on and for generating a flash and signal in response to which the second flash lamp is turned off.

REFERENCES:
patent: 3636406 (1972-01-01), Ackermann
patent: 3868701 (1975-02-01), Kawasaki
patent: 3944877 (1976-03-01), Sato

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