Image forming device having function for controlling temperature of heating member

摘要

An image forming device has a heating member, a thermal detecting unit, and a control unit. The heating member is positioned at an ambient temperature and heated by a heat source. The heating member fixes a developed image to a recording sheet. The thermal detecting unit is provided separately from the heating member. The thermal detecting unit detects a first temperature. The control unit uses a function to calculate a second temperature of the heating member on the basis of the detected first temperature. The control unit controls the heat source on the basis of the second temperature. The function has a rate of change that increases with decreasing the ambient temperature.

主权项

1. An image forming device, comprising:
a heating member to be heated by a heat source, the heating member being configured to fix a developed image to a recording sheet; a thermal detecting unit spaced apart from the heating, member, the thermal detecting unit being configured to detect a first temperature of the heating member; and a control unit configured to use a function to calculate a second temperature of the heating member on the basis of the detected first temperature, the control unit being configured to control the heat source on the basis of the second temperature, the function having a rate of change that increases as the first temperature at a start of heating the heating member decreases, wherein the control unit is configured to calculate the second temperature by using the rate of change which is determined based only on the first temperature at the start of heating detected only by the thermal detecting unit spaced apart from the heating member and is configured to calculate the second temperature while maintaining the determined rate of change during warm up of the heating member.