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:
Dec. 29, 2020
Filed:
Jun. 12, 2020
Kyocera Document Solutions Inc., Osaka, JP;
Keiya Nishimura, Osaka, JP;
Masahito Ishino, Osaka, JP;
Yoshitaka Imanaka, Osaka, JP;
Toshiki Fujita, Osaka, JP;
KYOCERA Document Solutions Inc., Osaka, JP;
Abstract
An image forming apparatus includes an image bearing member and a charging roller that charges a circumferential surface of the image bearing member to a positive polarity. The image bearing member includes a conductive substrate and a photosensitive layer of a single layer, and satisfies formula (1) shown below. The charging roller includes a conductive shaft, a base layer covering a surface of the conductive shaft, and a surface layer covering a surface of the base layer. In formula (1), Q represents a charge amount of the circumferential surface of the image bearing member. S represents a charge area of the circumferential surface of the image bearing member. d represents a film thickness of the photosensitive layer. εrepresents a specific permittivity of a binder resin contained in the photosensitive layer. εrepresents a vacuum permittivity. V represents a value calculated according to formula (2) V=V−V.