Color-mixing fixing device in which impact resilience of surface layer of fixing rotary member is 50% or less

摘要

A color-mixing fixing device includes a first fixing rotary member, and a second fixing rotary member for forming a nip together with the first fixing rotary member. After toner images of a plurality of colors stacked on one surface of a recording medium are fixed by a nip, toner images of a plurality of colors stacked on the other surface of the recording medium are fixed by the nip, thereby forming full-color images on both the surfaces of the recording medium. Each of the first and second fixing rotary members has a surface rubber layer with an impact resilience of 50% or less.