| 摘要 |
A fixing device (20; 20A) to fix a toner image on a sheet includes a. flexible endless belt (21) that rotates in a predetermined direction, an inner circumferential surface of which includes a fluorine-containing surface layer (21a), a rotary member (31) that contacts an outer circumferential surface of the belt (21), a fixed member (26) fixed inside the belt (21) to press against the rotary member (31) via the belt (21), forming a nip portion therebetween, a lubricant (Q) applied between the belt (21) and the fixed member (26), and a heat source (25; 50) to heat at least one of the belt (21) and the rotary member (31). A surface of the fixed member (26) that slidingly contacts the inner circumferential surface of the belt (21) includes a fluorine-containing surface layer (26a). One of the fluorine-containing surface layers (21a; 26a) is porous, and at least one of the fluorine-containing surface layers (21a; 26a) has a surface energy greater than a surface tension of the lubricant (Q). |
