| 摘要 |
PURPOSE:To enable to form an image with gradations, by a method wherein a voltage varied at the same period as a dot period for recording and having a pulse width varied in accordance with a recording signal is impressed on an aperture electrode for controlling an ion flow. CONSTITUTION:The aperture electrode 5 is provided on a path along which ions generated by an ion generator 1 and a corona wire 2 are passed toward a counter electrode 3, and the ion flow is controlled, thereby forming an electrostatic image. In this operation, a voltage varied at the same period as the recording dot period and turned ON and OFF with a pulse width according to the recording signal is impressed on the electrode 5. Accordingly, the ion beam diameter of the ion flow which is passed when the voltage is ON is modulated, and the density of the ion flow is varied at the same period as the recording dot period, thereby enabling to record with gradations. |
