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Abstract

This disclosure depicts an electrostatic grey tone printing device having a writing head for use with dielectric paper. The printing device comprises recording electrodes on the writing head having a substantially elongated cross-sectional geometry such that a width dimension is significantly less than a length dimension. Complementary electrodes are operatively associated with the recording electrodes and have a predetermined cross-sectional geometry. A means is provided for applying a first voltage of one polarity to one or more of the recording electrodes, and a means is provided for applying a second voltage of opposite polarity to one or more of the associated complementary electrodes. The printing device also comprises a means for advancing the dielectric paper past the complementary and recording electrodes in increments substantially equal to the width of the recording electrodes. The recording electrodes are oriented such that their width dimension is parallel to the direction of advancing paper. Also, the width dimension of the recording electrodes is sufficiently small to effect the appearance of grey tone areas.

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First Claim