Development device and image forming apparatus

Details Development device and image forming apparatus Development device and image forming apparatus

2008-09-24

2011-11-29

Gray, David (Department: 2852)

Electrophotography

Image formation

Development

C399S279000

Reexamination Certificate

active

08068772

ABSTRACT:
A development device includes a developer carrier supplying developer to an electrostatic latent image carrier which is rotatable. The developer carrier includes a conductive metal core and a conductive elastic layer that is disposed outside a circumference of the conductive metal core and includes a surface having a roughness formed thereon. The surface of the conductive elastic layer satisfies a relationship 1.0<Rz2/Rz1<1.60, where Rz1 and Rz2 are ten-point mean roughenesses in a circumference direction and an axial direction of the developer carrier, respectively, and satisfies a relationship 0.20<Sm2/Sm1<1.00, where Sm1 and Sm2 are mean widths of profile elements of the surface of the conductive elastic layer in the circumference direction and the axial direction of the developer carrier, respectively.

REFERENCES:
patent: 7078143 (2006-07-01), Hashimoto et al.
patent: 2005/0226659 (2005-10-01), Ebe
patent: 2006/0198664 (2006-09-01), Ebe
patent: 07-319287 (1995-12-01), None
patent: 2004341511 (2004-12-01), None
patent: 2006-243358 (2006-09-01), None

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