Image forming apparatus and electrophotographic photosensitive member
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United States of America Patent
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Sep 26, 2017
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app pub date -
May 19, 2015
filing date -
Nov 21, 2012
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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 μm2 or more and 90000 μm2 or less and a total area of a flat portion contained in a portion other than the recessed portion is 80000 μm2 or more and 240000 μm2 or 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.
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