| 摘要 |
An electrostatic recording apparatus includes a recording member having a surface on which an electrostatic latent image is formed; a recording head, to effect discharging to produce the ions; first bias voltage source for applying a bias voltage to the second electrode; second bias voltage source for applying to the third electrode a bias voltage having the same polarity as that of the bias voltage applied to the second electrodes and having an absolute voltage which is smaller than that of the bias voltage applied to the second electrode. The parameters of the means for so determined that the ions produced by the recording head and moved to the recording surface are controlled so as to provide a high resolution image. For example, the number of occurrences of effective dischargeable voltages per one charge dot is not less than 10; a distance 1 (mm) between the recording surface and the third electrode, the bias voltage Vs (V) to the third electrode, a maximum surface potential Vd (V) of the recording surface in the area opposed to the recording head satisfy the relationships, 2.5x103 </=¦Vs-Vd¦/1, and 1</=0.25. When the recording member has a curved surface, the number n of time sharing for operating the first electrodes, a picture element density of recording p (dots/mm), a radius of curvature of the recording surface R (mm) and a distance m (mm) between adjacent first electrodes, satisfy a relationship, pxR1/2[/m(n-1)]>/=1.6.
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