| 摘要 |
An image information signal is applied to an ion generator, which generates ions in accordance with the image information signal and extracts the ions to deposit them on one side of an image bearing member. An electric charge having the polarity opposite to that of those ions is injected into toner particles, so that the toners are deposited onto the other side of the image bearing member by the attraction force with the ions, and therefore, an image is formed on the image bearing member in accordance with the image information. The ion generator includes a first electrode, a second electrode, a third electrode so disposed that the second electrode lies between the first electrode and the third electrode, a first dielectric member between the first electrode and the second electrode, a second dielectric member between the second electrode and the third electrode. The second dielectric member and the third electrode are provided with plural apertures. By applying alternating potential between the first electrode and the second electrode, the ion generator generates positive and negative ions in the apertures. Between the second electrode and the third electrode, a bias voltage is applied in accordance with the image information so that the ions having a polarity determined by the polarity of the bias voltage are extracted from the positive and negative ions.
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