Patent ID: 7221896
Filing Date: 2007-05-22
Classification: G03G

Abstract:
1. A fixing device, comprising: a fixing roller, where the fixing roller is a heat roller having a heat source; and at least two pressure rollers providing respective nip portions by pressing the fixing roller, wherein the fixing roller and the pressure rollers rotate, thereby transporting a recording medium to the nip portions and fixing a developing agent on the recording medium, the at least two pressure rollers including: wherein the heat roller, the first pressure roller, and the second pressure roller satisfy the following relationship; an outer diameter of the heat roller>an outer diameter of the first pressure roller>an outer diameter of the second pressure roller, and wherein the heat roller is made up of (a) a hollow cylinder having a wall thickness of 3 mm or less with thermal conductivity and (b) a heat-roller-side elastic layer having a thickness of 1 mm or less with elasticity, the heat-roller-side elastic layer being formed around the hollow cylinder.