| 摘要 |
PURPOSE:To obtain an electrostatic recording head which can extract ions stably and uniformly, by applying an alternating voltage first and second electrodes and forming an electric field extending through covering dielectric and space regions between said electrodes then producing ions in the air regions and providing said ions selectively onto a recording face. CONSTITUTION:When an alternating voltage is applied first and second electrodes 1, 2 of a pair of electrodes, creeping discharge occurs near the surface of dielectric existing between said electrodes. In other word, application of alternating voltage causes formation of an electric field extending through a covering dielectric 3, an air region 5 and a dielectric 4 between said electrodes so as to produce discharge in the air region 5. On the other hand, a D.C. bias voltage is applied by a bias power source 10 across a selected third electrode 14 and a backface electrode or a conductive layer 8 of a recording material 6 to form an electric field which causes discharging and produces positive and negative ions each of which are transferred to the side of the recording material 6. The polarity of ion is determined by the polarity of the bias voltage and the surface of an insulation layer 7 in the recording member 6 is charged with that polarity thus forming a static dot image. |
