Patent ID: 11971669
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. An electrophotographic image forming apparatus comprising an electrophotographic belt as an intermediate transfer belt, the electrophotographic belt comprising a cylindrical film as a base layer, wherein:
the cylindrical film comprises a crystalline polyester, an amorphous polyester and carbon black;
a content of the carbon black in the cylindrical film is 2.0% by mass or more; and
Fc1 is 0.30 or more, and Φc1 is −10° to +10°,
where Fc1 denotes an average degree of arrangement of the carbon black in a circumferential direction observed in a cross section in a direction along the circumferential direction of the cylindrical film, and Φc1 denotes an average arrangement angle of the carbon black in the circumferential direction observed in the cross section in the direction along the circumferential direction of the cylindrical film.