| 摘要 |
<p>A charging member (2) for being contactably disposed to an image bearing member and being supplied with a bias voltage includes a resistance layer having an ionic electrical conductivity. The resistance layer comprises a foamed elastic member and satisfies the following relationships: <DF>B </= (5/3) x A - 0.3, </DF> and <DF>B >/= 0.6, </DF> wherein A represents a surface bubble-containing density measured, in a state that air bubbles are attached to the surface of said resistance layer, by immersion method according to JIS Z 8807; and B represents a surface bubble-deaerated density measured, in a state that said air bubbles are removed from the surface of said resistance layer, by immersion method according to JIS Z 8807. <IMAGE></p> |
