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:
Sep. 04, 2018
Filed:
Dec. 27, 2017
Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;
Yuta Imase, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-shi, Hyogo, JP;
Abstract
A charging roller is provided which has a simple construction without provision of a coating film and yet is capable of uniformly electrically charging the surface of a photoreceptor body and more advantageously suppressing adhesion and accumulation of fine particles. A charging roller production method is also provided. The charging roller () includes a roller body () having an outer peripheral surface () which includes a surface roughness component including a multiplicity of asperities and having a void volume Vv of less than 0.3 ml/m, and a surface waviness component including a multiplicity of asperities having a lower frequency than the surface roughness component and having a void volume Vv of not less than 0.05 ml/mand not greater than 6 ml/m, the void volumes Vv being each defined as the sum Vvc+Vvv of a core void volume Vvc and a dale void volume Vvv. The production method includes the step of finishing the outer peripheral surface () into a surface geometry satisfying the aforementioned requirements for the void volumes Vv by at least one of laser processing, wet blasting and dry blasting after polishing the outer peripheral surface ().