Control apparatus for energizing heating element
US6097904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1998 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Feb 10, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/2003
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In order to separately detect an abnormal temperature rise at a fixing roller of an image forming apparatus and a disconnection of a thermistor that detects the temperature of the fixing roller, the first and the second resistors are selected and connected to a thermistor for predetermined periods of time. When the first resistor is connected to the thermistor, a disconnection of the thermistor is detected based on a detection voltage that corresponds to the voltage division ratio of the reading for the first resistor to the reading for the thermistor. When the second resistor is connected to the thermistor, an abnormal temperature rise of the fixing roller is detected based on a detection voltage that corresponds to the voltage division ratio of the reading for the second resistor to the reading for the thermistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.