Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1983-11-23
1984-12-04
Adams, Russell E.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
354416, 354418, 315241P, G03B 1503, G03B 1505
Patent
active
044860862
ABSTRACT:
Electronic flash apparatus produces a variable amount of flash illumination corresponding to pre-flash photographic conditions, i.e. subject distance, film speed, ambient light intensity, etc. Circuitry, which has a threshold adjustable in response to a pre-flash signal relating to the flash illumination required for the photographic conditions, monitors energy as it is delivered to a flash tube to produce flash illumination, for activating quenching circuitry to limit the discharging of a flash capacitor to an amount of energy corresponding to the pre-flash signal.
REFERENCES:
patent: 2901671 (1959-08-01), Most
patent: 3296947 (1967-01-01), Engelsmann et al.
patent: 3682056 (1972-08-01), Tokutomi
patent: 3976913 (1976-08-01), Mashimo
Adams Russell E.
Eastman Kodak Company
Monteith Dennis P.
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