Patent ID: 8971774
Filing Date: 2015-03-03
Classification: G03G

Abstract:
1. A fuser, comprising: a first roller that includes a first core formed in a pipe shape in a cross-section and a first elastic layer formed on an outer periphery side of the first core; an endless belt member that is provided on and rotates around the first roller; a second roller that includes a second core formed in a pipe shape in a cross-section and a second elastic layer formed on an outer periphery side of the second core and that forms a nip part by pressing, through the belt member, the first roller; and a heating member that is positioned on an inner periphery side of the belt member and that heats the belt member, wherein the first core and the second core are made of substantially the same material, the first elastic layer and the second elastic layer are made of substantially the same material, a thickness of the second elastic layer of the second roller is less than a thickness of the first elastic layer of the first roller, a heat capacity of the second roller is less than a heat capacity of the first roller by 59 or more [J/K ], and the second roller is heated by the belt member that has been heated by the heating member.