| 摘要 |
A fixing device includes a belt heating a toner image on recording material, a member slidable on the belt inner surface, a pressor pressing the belt against the member to form a recording material nip, and a projection and recess provided on a nip forming surface of the member. When pressure applied when a toner temperature of the toner image reaches a softening temperature T1 (° C.) is P1 (kgf/cm2), pressure applied when the toner temperature reaches an incipient fluidization temperature T2 (° C.) is P2 (kgf/cm2), the toner temperature when P(t)/eta(t) wherein eta(t)is a toner melt viscosity (Pa·s) and P(t) is a pressure (kgf/cm2) applied with the toner melt viscosity eta(t) is maximum is T3 (° C.), and pressure applied when the toner temperature reaches T3 (° C.) is P3 (kgf/cm2), the following relationships are satisfied: 0.3<P1/(P1+P2+P3),1) 0.3<P2/(P1+P2+P3), and2) 0.2<P3/(P1+P2+P3)<0.3.3)
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