Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1979-10-22
1981-11-03
La Roche, 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
042988268
ABSTRACT:
A series control type automatic flash unit which is capable of achieving completely controlled flashing by controlling electrical energy supplied from a main capacitor to a discharge lamp by means of a first switching element connected in series with the discharge lamp. A series circuit of a second switching element conducted by a light control signal derived from light control means and a commutation capacitor is connected in parallel with the series circuit of the discharge lamp and the first switching element, and the commutation capacitor is charged by charging means in a predetermined polarity. This charging is performed at least prior to the state of commutation, and upon conduction of the second switching element by the light control signal, stored charges of the commutation capacitor are applied via the second switching element to the first switching element to place it in a reverse biased condition. As a consequence, the first switching element is turned OFF to stop lighting of the discharge lamp. Since the second switching element which still remains conductive at that time is connected in parallel with the discharge lamp, no unnecessary discharge current flows in the discharge lamp immediately after turning OFF of the first switching element; thus, the quantity of light emitted by the discharge lamp can be controlled with high precision.
REFERENCES:
patent: 3754162 (1973-08-01), Katayama
patent: 3849703 (1974-11-01), Shimamura et al.
patent: 3864600 (1975-02-01), Schneider
patent: 3909667 (1975-09-01), Decker
La Roche Eugene R.
Morris Photo Ind. Co. Ltd.
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