Heating device, image forming apparatus, and liquid discharge apparatus having heating roller with multiple fixed heating sources

Abstract

A heating device, an image forming apparatus, and a liquid discharge apparatus. The heating device includes a heating roller having heat sources inside to heat a sheet. The heat sources include three or more first heat sources having a same distribution of thermal intensity and a second heat source having a distribution of thermal intensity different from the distribution of the thermal intensity of the first heat sources, and the second heat source is disposed inside a polygon whose vertices are the first heat sources when viewed from one end of the heating roller in a longitudinal direction of the heating roller. The image forming apparatus includes an image forming device to form an image on a sheet, and the heating device to heat the sheet. The liquid discharge apparatus includes a liquid discharge device to discharge liquid onto a sheet, and the heating device to heat the sheet.

Dependencies are inferred from the claim text.