Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1975-04-10
1976-09-14
Segal, Robert
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315150, 354132, H05B 3702, G03B 1503
Patent
active
039809234
ABSTRACT:
Photographic flash apparatus having one flash unit which may be called the main or master or primary flash unit, and one or more additional flash units which may be called secondary or slave or dependent units. Eliminating connecting cables often used in the prior art, and also eliminating ratio frequency controls sometimes used in the prior art relating to multiple units, the secondary or dependent units of the present invention are independently powered and are triggered to initiate a flash by the light from the flash of the main unit, and triggered to terminate or discontinue the flash in each dependent unit when the flash in the main unit turns off. The control of each secondary unit is entirely by means of the flash of light from the main unit. The apparatus is particularly useful in studio lighting where it is desired to illuminate the subject being photographed from a plurality of different directions.
REFERENCES:
patent: 3156827 (1964-11-01), Porteous et al.
patent: 3288044 (1966-11-01), Bramer
patent: 3714443 (1973-01-01), Ogawa
patent: 3809954 (1974-05-01), Engelstatter
Rollei-Werke Franke & Heidecke
Segal Robert
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