Fixing device and image forming apparatus

An image forming apparatus comprising:

• an image carrier to carry an electrostatic latent image;
• a development device to visualize the electrostatic latent image into a toner image;
• a transfer device to transfer the toner image formed on the image carrier onto a recording medium;
• and
• a fixing device disposed downstream from the transfer device in a recording medium conveyance direction to fix the toner image on the recording medium,
• the fixing device including:
• a fixing rotator rotatable in a predetermined direction of rotation;
• an abutment rotator contacting the fixing rotator to form a fixing nip therebetween through which a recording medium is conveyed;
• a heater disposed opposite the fixing rotator to heat the fixing rotator;
• and
• a thermopile array disposed opposite an outer circumferential surface of the fixing rotator to detect a temperature of the outer circumferential surface of the fixing rotator,
• the thermopile array being tilted with respect to the outer circumferential surface of the fixing rotator to cause a bisector dividing a view angle of the thermopile array in an axial direction of the fixing rotator into two equal parts and a rotation axis of the fixing rotator to define an outboard angle and an inboard angle disposed inboard from the outboard angle in the axial direction of the fixing rotator and different from the outboard angle.