Patent ID: 6741824
Filing Date: 2004-05-25
Classification: G03G

Abstract:
An image forming apparatus comprising:an image bearing member; a charging member for forming a nip with said image bearing member thereby charging said image bearing member, wherein conductive particles are provided in said nip; wherein a time factor &agr; represented by a following equation satisfies a condition &agr;>15: &agr;=2&pgr;Â·kÂ·NcÂ·(W/Vc)/(&rgr;Â·CdÂ·Z) Z=âˆ’0.5Â·1n(&pgr;Â·kÂ·Nc)âˆ’1n({square root over (&bgr;)}Â·D/2) (&bgr;=1.1932) in which &rgr; (&OHgr;) represents a surface resistivity of said image bearing member; Cd (F/mm2) represents an electrostatic capacitance of the image bearing member; D (mm) represents a diameter of said conductive particle; Nc (particle/mm2) represents a density of said conductive particles present on said charging member; Vc (mm/sec) represents a surface moving speed of said charging member; Vd (mm/sec) represents a surface moving speed of said image bearing member; k=Vc/Vd; and W (mm) represents a width of said nip in the moving direction of said image bearing member.