Invention Grant
- Patent Title: Belt member, transfer unit incorporating same, image forming apparatus incorporating same, and method of evaluating same
- Patent Title (中): 带构件,结合其的转移单元,结合其的图像形成装置及其评估方法
-
Application No.: US12329127Application Date: 2008-12-05
-
Publication No.: US08014708B2Publication Date: 2011-09-06
- Inventor: Yuuji Sawai
- Applicant: Yuuji Sawai
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Limited
- Current Assignee: Ricoh Company, Limited
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-316230 20071206
- Main IPC: G03G15/01
- IPC: G03G15/01

Abstract:
A multi-layer endless belt member with a high-resistance surface layer for use in an image forming apparatus. A volume resistivity thereof ranges from approximately 8.0 to approximately 11.0 in log [Ω·cm]. An amount of resistivity change of a first surface thereof is greater than an amount of resistivity change of a second surface thereof by 0.05 or greater in log [Ω/square], where the amount of resistivity change of the first surface indicates a difference between surface resistivity values measured after a given voltage is applied for 1 second and for 100 seconds on the first surface thereof and the amount of resistivity change of the second surface indicates a difference between surface resistivity values measured after a given voltage is applied for 1 second and for 100 seconds on the second surface thereof.
Public/Granted literature
Information query