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:
Mar. 10, 2020
Filed:
Apr. 24, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Takeshi Fujino, Abiko, JP;
Akinori Miyamoto, Bando, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A charging roller is configured to charge a surface of an image bearing member configured to bear an image. The charging roller includes: a shaft portion; an elastic layer formed around the shaft portion; and a surface layer formed around the elastic layer, wherein particles having particle diameters within a range of 2 μm or larger and 15 μm or smaller and dispersed in the surface layer, and wherein a reduced peak height Spk (μm), a reduced dale height Svk (μm), and a core height Sk (μm) with respected to the surface layer of the charging roller satisfy 4≤Spk+Sk≤8 and 0.5≤Svk≤1.