Photocopying – Contact printing – Light boxes
Patent
1993-11-24
1994-08-16
Moses, R. L.
Photocopying
Contact printing
Light boxes
430 33, G03G 1520
Patent
active
053391470
ABSTRACT:
Ultrasonic fusing is performed sequentially by generating heat in an external fusing member (i.e. fuser roll surface) by ultrasonic absorption and then contacting unfused toner images with the heated member as they pass through a fusing nip comprising the heated member and a pressure roll. The externally heated roll member is fabricated from a material having a high loss tangent (tan delta) and is therefore capable of dissipating a large percentage of heat energy generated therein. Loss tangent is defined as the ratio of a material's viscous modulus to its elastic modulus. Heat generation in the viscoelastic member is created through acoustic distortions in viscoelastic member. Thus, the acoustic waves absorbed by the viscoelastic material forming the outer layer of the fuser roll are converted to heat energy. The heat generated in the roll member is transferred to the toner through intimate contact therewith. The heat transferred by the viscoelastic material serves to soften the toner to the degree necessary for efficient fusing of the toner images.
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Mashtare Dale R.
Snelling Christopher
Moses R. L.
Xerox Corporation
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