| 摘要 |
Graphic data transcription apparatus comprising a writing plate made of an electrically resisting medium and having a given shape, two sets of terminals arranged along the periphery of said plate, means for alternately and rhythmically applying to one and the other of said sets biasing voltages to sequentially produce at a given frequency two mutually orthogonal electric fields in said medium, the terminals in each one of said sets being alternately interconnected and insulated from each other, a conductive point probe in bearing contact with and movable on the writing plate surface, and means for using the voltage alternately developed between said probe and a point at a fixed reference potential to visually reproduce on a receiver the geometric track followed by said probe on said surface. In the case of a rectangular writing plate, the ratio of the width of the terminals in each one of said sets to their mutual spacing is preferably comprised between one and two.
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