Electrophotography – Control of electrophotography process – Control of fixing
Patent
1997-09-16
1999-06-08
Grimley, Arthur T.
Electrophotography
Control of electrophotography process
Control of fixing
219619, 399330, G03G 1520
Patent
active
059110945
ABSTRACT:
An induction heating type fixing device for causing a toner image formed on a sheet to be fixed on the sheet. This fixing device contains a fixing roller formed of a conductive member in a cylindrical shape, a core passed through the interior of the fixing roller and intended to form a closed magnetic circuit, an induction coil wound around the core, a power source for forwarding an alternating circuit to the induction coil, a switch for passing or breaking the alternating current supplied from the power source to the induction coil, an electric current amount detecting coil for detecting the amount of an electric current flowing from the power source to the induction coil, a thermistor for detecting the temperature of the fixing roller, and a CPU for controlling the switch so as to forward an alternating current to the induction coil until the amount of the electric current detected by the electric current amount detecting coil reaches a prescribed amount and, after the amount of the electric current detected by the electric current amount detecting coil has reached the prescribed amount, controlling the switch so as to repeat the passage and the breakage of the alternating current to the induction coil and enable the temperature of the fixing roller to be retained at a predetermined temperature fit for the fixation of the toner image.
REFERENCES:
patent: 4764652 (1988-08-01), Lee
patent: 4914476 (1990-04-01), Nishitsuji et al.
patent: 5752150 (1998-05-01), Kato et al.
Grimley Arthur T.
Minolta Co. , Ltd.
Tran Hoan
LandOfFree
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