Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1977-03-22
1979-01-02
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315135, 354127, H05B 4132
Patent
active
041329260
ABSTRACT:
In an electronic flash device, wherein electrical energy stored by a main capacitor and an electronic flash tube is fired by the stored energy, a relaxation oscillator is adapted to oscillate when the main capacitor is charged to a given voltage level, which is a condition for completion of preparation for flash tube operation. The relaxation oscillator includes a capacitor, a glow discharge tube, and a resistor and the oscillation thereof causes intermittent glow discharge through the glow discharge tube for indicating the completion of preparation for flash tube operation. The electronic flash tube is triggered to emit a light flash by the stored energy of the relaxation oscillator capacitor. Excitation of the flash device, even with a power supply switch open, is prevented by isolating the main capacitor from the trigger capacitor and also from the glow discharge tube to also prevent an indication of flash preparation. The trigger capacitor is also discharged through the resistor to prevent actuation of the flash device should the flash synchro switch be closed with the power supply switch open.
REFERENCES:
patent: 3764849 (1973-10-01), Ohta
patent: 3814985 (1974-06-01), Pecher et al.
patent: 3890538 (1975-06-01), Iwata et al.
patent: 3919594 (1975-11-01), Mahlich et al.
Hosomizu Hiroshi
Ohta Yoshiharu
LaRoche Eugene R.
Minolta Camera Kabushiki Kaisha
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