| 主权项 |
1. A charging device comprising:
a discharge electrode configured to charge a surface of an image carrier; a charging device body including an opening portion for charging, the opening portion being provided so as to surround the discharge electrode and be opposed to a surface of the image carrier across a longitudinal direction of the discharge electrode; a charging duct member provided so as to surround at least the entire opening portion of the charging device body, the charging duct member being configured to introduce and exhaust an airflow within the surrounded area, the charging duct member including,
an intake port configured to communicate with the intake unit and divided into a first intake port and a second intake port, the first intake port being configured to communicate with a first independent airflow path formed independently in the charging duct member, the second intake port being configured to communicate with a second independent airflow path formed independently in the charging duct member, the first independent air flow path being formed relatively closer to the surface side of the image carrier to form an airflow wall, the second independent airflow path being formed to merge the airflow with the airflow wall via the discharge electrode, the first independent airflow path having a velocity of approximately 0.6 to 0.8 m/sec, the second independent airflow path being formed to merge an airflow with the airflow wall via the discharge electrode, the second independent airflow path having a velocity of approximately 0.2 to 0.4 m/sec; an intake unit configured to generate an airflow to be guided into the charging duct member; and an exhaust unit configured to exhaust the airflow guided into the charging duct member, the charging duct member including an airflow wall forming unit configured to cover, with the airflow wall, the entire opening portion from an upstream end in a rotation direction of the image carrier at the opening portion to a downstream end in the rotation direction of the image carrier at the opening portion, the airflow wall forming unit including,
an intake exit portion, provided between the charging device body and the charging duct member on an upstream side in the rotation direction of the image carrier at the opening portion, andan exhaust entry portion, provided between the charging device body and the charging duct member on a downstream side in the rotation direction of the image carrier at the opening portion, the airflow wall being formed by an airflow flowing from the intake exit portion to the exhaust entry portion. |
