Electrophotographic printer and fixing unit controlling apparatus therfor
US6014531A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Nov 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/2039
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixing unit has a heat roller with a heater element built therein, a pressure roller disposed to oppose the heat roller and holds and advances a print medium therebetween in sandwiched relation. A thermistor is in contact with the heat roller and detects the temperature of the heat roller. Another thermistor detects the temperature of the pressure roller. A control circuit controls energization of the heater element so as to maintain the temperature of the heat roller to a target temperature. The heater element is energized to maintain a constant value of Tc given by an equation Tc=Th+k.multidot.Tp where Th is a surface temperature of the heat roller, Tp is a surface temperature of the pressure roller, and k is a coefficient having the range of 0<k<1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.