Electrographic marking with modified addressing to eliminate striations

A method of producing an electrostatic image along a scan line of a recording medium utilizing a recording means including an array of stylus electrodes arranged in a series of groups cooperable with a series of complementary electrodes, each of said stylus electrode groups cooperating with a portion of two adjacent complementary electrodes, said recording medium including a conductive layer and a dielectric layer, whereby writing is accomplished by depositing a charge pattern upon said dielectric layer in the region of a stylus electrode group when both said stylus electrode group and a cooperating pair of complementary electrodes are pulsed contemporaneously, the method comprising:

• first perturbing a writing region of said recording medium, coextensive with a stylus electrode group, by causing a first non-uniform potential perturbation to be disposed upon one portion thereof,
• then perturbing said writing region further by imposing a second non-uniform potential perturbation upon another portion thereof, and
• then imposing a substantially uniform potential distribution upon said writing region over said first and second non-uniform potential perturbations, whereby said first and second non-uniform potential perturbations approximately cancel one another.

A method of producing an electrostatic image along a scan line of a recording medium utilizing a recording means including an array of stylus electrodes arranged in a series of groups cooperable with a series of complementary electrodes, each of said stylus electrode groups cooperating with a portion of two adjacent complementary electrodes, said recording medium including a conductive layer and a dielectric layer, whereby writing is accomplished by depositing a charge pattern upon said dielectric layer in the region of a stylus electrode group when both said stylus electrode group and a cooperating pair of complementary electrodes are pulsed contemporaneously, the method comprising the steps of alternately:

• first depositing a charge pattern, coextensive with a stylus electrode group, upon a first portion of said recording medium having substantially no residual potential perturbations thereon, and
• then depositing a charge pattern, coextensive with a stylus electrode group, upon a another portion of said recording medium having residual potential perturbations upon two portions thereof, which residual potential perturbations approximately cancel out one another.