| 摘要 |
Disclosed is a thermal fixing device equipped with a plurality of heaters for heating a fixing member at different axial positions thereof for proper temperature control. In S300, a judgment is made as to whether the difference between the center temperature TA and the end temperature TB exceeds a proper temperature difference range (15° C.) or not. When the difference exceeds the proper temperature range (S300: YES), the procedure advances to S310, where, of the center temperature TA and the end temperature TE, the one nearer to the average temperature TM of the fixing upper limit temperature Th and the fixing lower limit temperature T1 is selected. Subsequently, in S320, the control value for the farther halogen lamp is changed so as to approach the selected temperature. And, in S330, a judgment is made as to whether the temperature difference is 10° C. or less. When it is not 10° C. or less, the procedure returns to S320 to further change the control value. With this process, it is possible to set both the temperatures and the portion near the center of the thermal roller to temperatures within the proper temperature range.
|
