| 摘要 |
PURPOSE:To form a sharp recording image with a long-term stability by a method wherein a cleaning electric field for transferring a developer on a recording electrode to an opposed electrode is formed in an electrode opposed part within a non-recording time. CONSTITUTION:Within a cleaning time t4 in a non-recording time t2, +20OV cleaning voltage V3 is applied to a cylindrical electrode 5, and a 0V OFF voltage is applied to all recording electrode lines. A cleaning electric field based on an electric potential difference of +200V in view from the cylindrical electrode 5 to the recording electrode lines is formed in an electrode opposed part. A magnetic toner on all the recording electrode lines is transferred onto the peripheral surface of the cylindrical electrode 5. An electric potential difference in this case is +50V larger than a +150V electric potential difference generated when an ON voltage is applied within a recording time t1. Therefore, the resulting strong electric field enables the magnetic toner remaining on the recording electrode lines in the recording time t1 to be also transferred to the peripheral surface of the cylindrical electrode 5. In this manner, the magnetic toner can be efficiently prevented from accumulating on the recording electrode lines, and a reduction of image contrast and an occurrence of a defective image caused by a voltage leak between recording electrode lines through an accumulated magnetic toner can be positively prevented. |
