Constant light intensity electronic flash device

Details Constant light intensity electronic flash device Constant light intensity electronic flash device

1980-03-26

1981-06-23

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315151, 315158, 315207, 315208, 315209R, 315244, H05B 4132

Patent

active

042753350

ABSTRACT:
The emitted light intensity of an electronic flash tube is maintained constant over a given time period by connecting the electronic flash tube in series with an inductor and a switching element across the main capacitor for energizing the flash tube, with a diode being connected across the serially connected flash tube and inductor and a polarity opposite to the current flow from the main capacitor to the flash tube. The switching element is intermittently turned off and on in accordance with the intensity of the light emitted from the flash tube. While the switching element is being turned off, the flash tube is energized by the energy stored in the inductor in the form of a magnetic field. An auxiliary capacitor may be provided across the flash tube. The flash light intensity may be monitored by the measurement of the emitted light, or by the detection of the voltage across the flash tube, or by the detection of the current flowing into the flash tube.

REFERENCES:
patent: 3846811 (1974-11-01), Nakamura et al.
patent: 3946269 (1976-03-01), Ban

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