Patent ID: 7292801

Claim:
An image forming apparatus comprising: a fixing device including, a rotation body, a fixing belt arranged around the rotation body, a facing unit configured to face the rotation body, a first heat unit configured to heat a nipping area formed between the rotation body and the facing unit, a second heat unit configured to heat the nipping area, a high heat capacity unit configured to transfer heat from the first heat unit to the nipping area, a low heat capacity unit configured to transfer heat from the second heat unit to the nipping area, and a heat quantity controller configured to control heat quantity of the first heat unit and of the second heat unit, wherein, the first heat unit is configured to heat an edge portion and a center portion of the nipping area such that a heat quantity per unit area in an edge portion of the nipping area is higher than a heat quantity per unit area in a center portion of the nipping area, and the second heat unit is configured to heat the edge portion and the center portion of the nipping area such that the heat quantity per unit area in the edge portion is lower than the heat quantity per unit area in the center portion.