Fixing device and image forming apparatus

A fixing device comprising:

• a fixing rotary body rotatable in a predetermined direction of rotation;
• a heater configured to heat the fixing rotary body;
• an opposed body contacting the fixing rotary body to form a fixing nip therebetween through which a recording medium is conveyed;
• a heat shield movable in a circumferential direction of the fixing rotary body and including:
• a pair of shield portions disposed opposite both lateral ends of the fixing rotary body in an axial direction thereof to shield the fixing rotary body from the heater;
• and
• a bridge disposed opposite a center of the fixing rotary body in the axial direction thereof and bridging the shield portions, the bridge having a width smaller than a width of the shield portions in a direction perpendicular to a longitudinal direction of the heat shield;
• a driver connected to the heat shield to drive and move the heat shield within a circumferential moving span in the circumferential direction of the fixing rotary body;
• and
• an abnormal temperature detector configured to detect an abnormal temperature of the fixing rotary body, the abnormal temperature detector being disposed opposite the bridge of the heat shield;
• wherein the heater includes a halogen heater.