CHARGING MEMBER AND MANUFACTURING METHOD OF THE SAME, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide a charging member that can suppress the occurrence of image defects and contamination of a photoreceptor to provide good image quality, even when attached to a process cartridge or an image forming apparatus and left unused for a long period, when used after the unus...

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Bibliographic Details
Main Authors MIURA HIROYUKI, TOMARI SHOGO, HATTORI TAKAHIKO
Format Patent
LanguageEnglish
Japanese
Published 22.10.2015
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide a charging member that can suppress the occurrence of image defects and contamination of a photoreceptor to provide good image quality, even when attached to a process cartridge or an image forming apparatus and left unused for a long period, when used after the unused period.SOLUTION: There is provided a charging member that has a conductive support 31 and an elastic layer 33 provided on the conductive support 31, where the elastic layer 33 has a permanent compression set (Cs1) of 20% or less; when the permanent compression set of the elastic layer 33 after being heated at 120°C for 24 hours is Cs2, Cs1-Cs2 is 10% or less; and the elastic layer 33 has a degree of swelling of 2.0% or less. 【課題】プロセスカートリッジ又は画像形成装置に装着された状態で長期間未使用状態にあっても、その後の使用において、画質不良及び感光体汚染の発生が抑制され、良好な画質が得られる帯電部材の提供。【解決手段】導電性支持体３１と、導電性支持体３１上に設けられる弾性層３３とを有し、弾性層３３の圧縮永久歪量（Ｃｓ１）が２０％以下であり、弾性層３３を１２０℃で２４時間加熱した後の圧縮永久歪量をＣｓ２としたときにＣｓ１−Ｃｓ２が１０％以下であり、弾性層３３の膨潤度が２．０％以下である帯電部材。【選択図】図１
Bibliography:Application Number: JP20140060657