Flash tube apparatus with delayed emission

Details Flash tube apparatus with delayed emission Flash tube apparatus with delayed emission

1978-10-06

1980-10-14

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315241P, 354 33, H05B 4132

Patent

active

042283817

ABSTRACT:
A flash tube (speed-light) apparatus is provided with a drive circuit for ionizing gas in the flash tube in response to a triggering voltage produced by a trigger coil, and a light-measuring circuit measures the light emitted by the flash tube and reflected by an object to be photographed and controls the quantity of light emitted by the flash tube. The drive circuit comprises delay means that delays the flash emission by a predetermined delay time commencing with the energizing of the trigger coil. The delay time is selected longer than a period during which the light-measuring circuit is affected by noise generated by the energizing of the trigger coil.

REFERENCES:
patent: 3987468 (1976-10-01), Matsuzaki et al.

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