| 摘要 |
An ink jet printer is adapted to pass ink drops jetted from a nozzle of an ink head through a gap defined between parallel electrodes and to impart charges to these ink drops in the gap in response to video signals. Then, these ink drops are directed towards a record medium and their trajectories are deflected by passing the charged ink drops through a spacing defined between deflection electrodes, the ink drops being deflected in response to the quantity of electricity involved in the respective ink drops, whereby the ink drops impinge onto and adhere to the record medium at prescribed positions. The serial adhesions of the charged ink drops at suitable positions on the record medium, result in a desired image being recorded thereon. In this case, the parallel electrodes have a parallel distance related to the spacing lambda between successive ink drops, so that the jet column is not electrically affected by the charge of the preceding ink drop on the basis of resultant electric field from the charge of the preceding ink drop and virtual charge of electric image thereof. This parallel distance, for example, can be expressed d=0.77 lambda .
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