| 摘要 |
A fixing roller device which is capable of dividing the heating area into a plurality of separately heatable different parts both in the circumferential direction of the heater roller, as well as in the direction parallel to the axis of the heater roller. As a result, the heating area can be varied according to various image fixing requirements, as well as for varying initial warm-up requirements. In addition, the temperature of the heating roller can be controlled by varying the density of heating chips or heating elements which are supplied with power within a heated area. Further, temperature control can also be accomplished utilizing a control arrangement based upon the current passing through the heater chips or heater elements, since the current varies with temperature, and thus external temperature sensors for monitoring the temperature of the fixing roller are not required.
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