Fixing device and image forming apparatus

An image forming apparatus comprising:

• an image bearer to bear a toner image;
• and
• a fixing device, disposed downstream from the image bearer in a recording medium conveyance direction, to fix the toner image on a recording medium,
• the fixing device including:
• a fixing rotator rotatable in a predetermined direction of rotation;
• a pressure rotator contacting the fixing rotator to form a fixing nip therebetween, the fixing nip through which recording media of a plurality of sizes are conveyed, the recording media to create a plurality of non-conveyance spans on a lateral end of the fixing rotator in an axial direction thereof where the recording media are not conveyed;
• a heater disposed opposite the fixing rotator to heat the fixing rotator;
• and
• a multi-view thermopile array disposed opposite an outer circumferential surface of the lateral end of the fixing rotator in the axial direction thereof and tilted at an angle relative to the fixing rotator to detect a temperature of the fixing rotator,
• the thermopile array including an inboard temperature detection element directed to a conveyance span on the fixing rotator where the recording medium of a decreased size is conveyed.