Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1983-11-14
1984-08-07
Perkey, William B.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
354416, 354418, H05B 4114, G03B 1505
Patent
active
044646097
ABSTRACT:
A voltage detecting means is provided in a flash lamp firing circuit for detecting the attainment of the voltage of a storage capacitor to a satisfactory lamp firing voltage level to assure that a photographic camera associated with the flash lighting unit operates in a flash exposure range switched from a daylight exposure range only when a sufficient voltage is available to fire the lamp at the time of striking of the lamp. In one embodiment, the detecting means comprises two transistorized circuits having output terminals one of which is connected to the gate lead of a SCR in a discharge circuit of the lamp, and another output terminal which is arranged to be connectable to a light-emitting diode of the camera and therefrom connected to the gate lead of an electronic change-over switch for selection of the operating ranges of the camera, the light-emitting diode being arranged to be visible from the outside of the camera so that the operator is immediately aware if the storage capacitor voltage has attained the satisfactory firing level.
REFERENCES:
patent: 3638543 (1972-02-01), Kondo
patent: 3919593 (1975-11-01), Nakamura
patent: 3997815 (1976-12-01), Decker
patent: 4047194 (1977-09-01), Nakamura et al.
Mashimo Yukio
Nakamura Zenzo
Ohtaki Shohei
Tsunekawa Tokuichi
Uchidoi Masanori
Canon Kabushiki Kaisha
Perkey William B.
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