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Browse Prior Art Database

PROGRESSIVE ONSET OF FUSER LAMP

IP.com Disclosure Number: IPCOM000026533D
Original Publication Date: 1992-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present invention is directed at a means for delivering power to the fuser lamp of an electrophotograpic printing system, so as to reduce the maximum current drawn by the fuser lamp when it is started from a cold condition. The improvement is accomplished by gradually increasing the input power supplied to the fuser lamp, In one embodiment, for example the Xerox 50283: the line voltage would be full-wave rectified and controlled by a power mosfet in a manner similar to that described for an illumination lamp in the Xerox Disclosure Journal, Vol. 13, No. 4, p. 211 (July!August 1988). During each full-wave cycle of the line voltage, a fuser lamp controller would increase the output, until the desired fuser temperature is reached.

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XEROX DISCLOSURE JOURNAL

PROGRESSIVE ONSET OF FUSER LAMP U.S. C1.355/285 John M. Magde, Jr.

Proposed Classification

Int. C1. G03G 15/20

The present invention is directed at a means for delivering power to the fuser lamp of an electrophotograpic printing system, so as to reduce the maximum current drawn by the fuser lamp when it is started from a cold condition. The improvement is accomplished by gradually increasing the input power supplied to the fuser lamp, In one embodiment, for example the Xerox 50283: the line voltage would be full-wave rectified and controlled by a power mosfet in a manner similar to that described for an illumination lamp in the Xerox Disclosure Journal, Vol. 13, No. 4, p. 211 (July!August 1988). During each full-wave cycle of the line voltage, a fuser lamp controller would increase the output, until the desired fuser temperature is reached.

The advantages of the improvement are threefold. First, maximum power is never applied to the fuser lamp in a cold condition, therefore, the current drawn by the fuser lamp is limited during the warm-up period. Second, because the warm-up period is controlled, it is possible to rapidly achieve precise control of the fuser temperature. Third, use of the power mosfet enables the fuser temperature to be monitored and controlled using microprocessor hardware for the fuser lamp controller, thereby eliminating costly silicon controlled rectifiers (SCRs) and triacs which emit undesirable electro-magnetic inte...