Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1985-11-04
1987-08-18
Dixon, Harold
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315214R, 315242, 323222, 363 60, 430 33, 430 35, H05B 3700
Patent
active
046879714
ABSTRACT:
A power supply circuit comprises a single discharge capacitor having a charging sufficient to trigger discharge in a discharge lamp. The discharge capacitor is associated with means for accumulating energy, with which it is charged. The energy accumulating means receives commercially available alternating current and applies the accumulated energy to the discharge capacitor to charge the latter. The power supply circuit may include an auxiliary capacitor which has a smaller capacitance and higher potential rating than the discharge capacitor. The auxiliary capacitor may have a potential rating sufficient to activate the discharge lamp alone. The discharge capacitor cooperates with the auxiliary capacitor to define discharge period. Preferably, the power supply circuit may include means for blocking or shutting off power supply at a given timing to precisely control the discharge period. Such power supply blocking means is especially advantageous for controlling the quantity of light to be emitted by the discharge lamp. The discharge capacitor and the auxiliary capacitor are controlled so as to perform a two-stage flash which includes a first stage with a brief, relatively strong flash and a second stage with a longer, relatively weak flash. This flash is advantageous for fixing toner images with low- and high-toner-density components. Alternatively, the discharge period may be controlled to within a given period to achieve good fixation of the toner image without causing significant noise or smell.
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Dixon Harold
Fuji Xerox Company Limited
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