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. 26, 2017
Filed:
May. 19, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Takahiro Mitsui, Kawasaki, JP;
Tomohisa Itagaki, Abiko, JP;
Koji Takahashi, Kashiwa, JP;
Hiroki Uematsu, Mishima, JP;
Yasuhiro Kawai, Abiko, JP;
Tsutomu Nishida, Mishima, JP;
Hideki Ogawa, Moriya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
In an image forming apparatus in which an electrostatic image is formed on an electrophotographic photosensitive member using at least a process of a pseudo halftone formed by dots as a method of representing gradation, the electrophotographic photosensitive member is provided on a surface thereof with a plurality of recessed portions of 0.5 μm more and 5 μm or less in depth and 20 μm or more and 80 μm or less in longest diameter of an opening, when a square region of 500 μm×500 μm is arbitrarily extracted on the surface of the electrophotographic photosensitive member, in the square region, a total area of the recessed portions is 10000 μmor more and 90000 μmor less and a total area of a flat portion contained in a portion other than the recessed portion is 80000 μmor more and 240000 μmor less, and an arrangement (A) of the plurality of recessed portions is such an arrangement that an image quality lowering index (f) calculated by specific processing is 14% or less.