IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD

To provide an image forming apparatus that can prevent the occurrence of a ghost image and charging unevenness.SOLUTION: An image forming apparatus comprises: image carriers; and charging rollers that charge the peripheral surfaces of the image carriers in a positive polarity. The charging rollers e...

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Bibliographic Details
Main Authors NISHIMURA KEIYA, IMANAKA YOSHITAKA, ISHINO MASATO, FUJITA TOSHIKI
Format Patent
LanguageEnglish
Japanese
Published 24.12.2020
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:To provide an image forming apparatus that can prevent the occurrence of a ghost image and charging unevenness.SOLUTION: An image forming apparatus comprises: image carriers; and charging rollers that charge the peripheral surfaces of the image carriers in a positive polarity. The charging rollers each include a conductive shaft, a base layer that covers the conductive shaft, and a surface layer that covers the base layer. The surface layer has a volume resistivity of 13.0 logΩ cm or more. On a peripheral surface of the charging roller, the ten-point average roughness Rz is 6 μm or more 25 μm or less, and the average interval Sm of profile curve irregularities is 55 μm or more and 130 μm or less.SELECTED DRAWING: Figure 12 【課題】ゴースト画像及び帯電ムラの発生を抑制できる画像形成装置を提供する。【解決手段】画像形成装置は、像担持体と、像担持体の周面を正極性に帯電させる帯電ローラーとを備える。帯電ローラーは、導電性シャフトと、導電性シャフトを覆う基層と、基層を覆う表層とを備える。前記表層の体積抵抗率は１３．０ｌｏｇΩ・ｃｍ以上である。前記帯電ローラーの周面において、十点平均粗さＲｚは６μｍ以上２５μｍ以下であり、断面曲線凹凸の平均間隔Ｓｍは５５μｍ以上１３０μｍ以下である。【選択図】図１２
Bibliography:Application Number: JP20190111502