Thermistor isolation technique for a ceramic fuser heater

Details Thermistor isolation technique for a ceramic fuser heater Thermistor isolation technique for a ceramic fuser heater

2011-02-08

2011-02-08

Porta, David P (Department: 2884)

Electrophotography

Diagnostics

Fixing

C399S088000, C399S320000, C399S328000, C219S216000, C219S486000, C219S501000, C219S619000

Reexamination Certificate

active

07885557

ABSTRACT:
An electrically isolated temperature sensor for use with a printer, copier, or all-in-one fuser. The fuser includes an AC driven heater to which a thermistor is mounted for sensing the temperature of the fuser heater. A resistance of the thermistor controls the period of a periodic signal generated by an astable multivibrator. An optical isolator isolates the printer fuser from down line processing circuits, and transfers the periodic signal to such processing circuits. The printer fuser employs a separate floating ground that is not connected to other DC circuits of the printer. With this arrangement, any AC power that is inadvertently coupled from the heater to the DC circuits of the fuser is isolated thereto. The AC power is isolated to the fuser and cannot be propagated through the fuser to other down line circuits of the printer.

REFERENCES:
patent: 6037576 (2000-03-01), Okabayashi et al.
patent: 6097904 (2000-08-01), Tsuruno et al.
patent: 6111230 (2000-08-01), Cao et al.
patent: 6879803 (2005-04-01), Gogate et al.
patent: 2003/0059224 (2003-03-01), Tomita et al.
patent: 2004/0232137 (2004-11-01), Cook et al.
Sahlsten, “Circuit Transfers Resistance Value Through Isolation Barrier,” Electronic Design Magazine, Penton Media, Inc., Apr. 24, 2008.

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