Method for reducing flicker in electrophotographic printers and

Details Method for reducing flicker in electrophotographic printers and Method for reducing flicker in electrophotographic printers and

1996-08-23

1998-09-22

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, 219505, 219485, 374107, 323300, H05B 102

Patent

active

058117644

ABSTRACT:
The present invention is a control system for controlling the temperature of the fusing system. This control system utilizes the knowledge of the heating characteristics of the fuser filament along with the knowledge that the human eye is most sensitive to temporal changes near the 8 Hz to 10 Hz rate as well as the concept of shape factors to control the rate at which power is applied to the filament to bring the fusing system up to operating temperature. From the study of the electrical characteristics of the heating element it is known that the heating element resistance in the fusing system under study exhibits a thermal time constant of 330 mS while heating. Also, from the summary of flicker regulations it is known that the best reduction in flicker is for the case in which a ramp voltage change is implemented with a ramp time of at least 1 second.

REFERENCES:
patent: 4928055 (1990-05-01), Kaieda et al.
patent: 5483149 (1996-01-01), Barrett

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