Browse Prior Art Database

QUENCHED LOW CAPACITANCE FLASH LAMP POWER SUPPLY

IP.com Disclosure Number: IPCOM000025369D
Original Publication Date: 1984-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 55K

Publishing Venue

Xerox Disclosure Journal

Abstract

The circuit, shown in the figure, stores energy at a high voltage which is used to drive a lamp 8 used, for example, to expose a document in a document reproduction machine. The circuit also stores energy at and uses a low voltage SCR to quench the lamp for exposure control.

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1 XEROX DISCLOSURE JOURNAL

I Winston J. Powers

QUENCHED LOW CAPACITANCE FLASH LAMP POWER SUPPLY
Thomas J. Hammond

Proposed Classification
U.S. C1. 355/67 Int. CI. G03h 27/54

The circuit, shown in the figure, stores energy at a high voltage which is used to drive a lamp 8 used, for example, to expose a document in a document reproduction machine. The circuit also stores energy at and uses a low voltage SCR to quench the lamp for exposure control.

The circuit consists of a DC charging circuit 10, a main storage capacitor 12, a secondary storage capacitor 14, pulse shaping inductors 16, 18, secondary charging circuit 20, a quench SCR 22, blocking diode 24 and switch 26. The charge voltage of circuit 10 is set in response to known variables of the reproduction system which affect exposure. The voltage of circuit 20 is set to supply enough energy to compensate for the maximum area coverage of possible input documents.

In operation, once the voltages are set, lamp 8 is triggered and discharges capacitor 12. Before the current from capacitor 12 falls to zero switch 26 closes and capacitor 14 begins to discharge through the lamp. Capacitor 12 discharges to zero while capacitor 14 continues through its cycle until the correct exposure is reached and SCR 22 closes to quench capacitor 14.

Volume 9 Number 6 November/December 1984 399

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XEROX 400 DISCLOSURE JOURNAL

Volume 9 Number 6 November/December 1984

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