Patent ID: 7363859

Claim:
A fixing apparatus, comprising: a fixing member which heats a toner image; an opposite member which forms a nip between said fixing member and said opposite member, where said toner image is fixed on a record medium passing through said nip; a temperature detecting sensor which receives infrared rays radiated by said fixing member, thereby detecting the temperature of said fixing member without contact with said fixing member; a window member, which is arranged between said fixing member and said temperature detecting sensor, and which transmits the infrared rays; a frame which holds said window member; a partition having an opening, which is arranged between said fixing member and said window member, wherein said window member includes a surface with a fluorination organic compound; a second window member, which is arranged between said window member and said temperature detecting sensor, and which transmits the infrared rays; and a second frame which holds said second window member, wherein said second window member includes the surface with a fluorination organic compound.