The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2018
Filed:
Jun. 23, 2016
Canon Kabushiki Kaisha, Tokyo, JP;
Satoru Yamada, Numazu, JP;
Toshiro Suzuki, Gotemba, JP;
Yuya Tomomizu, Yokohama, JP;
Toshimitsu Nakazawa, Isehara, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electrophotographic roller includes an electro-conductive shaft core including a metallic layer at its surface, and an elastic layer on the shaft core. When kinetic friction coefficients of an outer peripheral surface of each end portion of the shaft core with respect to polyester resin are measured for one rotation of the shaft core, an average value μr of the kinetic friction coefficients is 0.05 to 0.50. When each outer peripheral surface is divided into three equal ranges, defined as a region A1, a region A2, and a region A3, in a peripheral direction of the shaft core, each of the regions has a location where the kinetic friction coefficients fall within a range of 1.5 μr to 1.8 μr, and a location where the kinetic friction coefficients fall within a range of 0.2 μr to 0.5 μr.