An electrostatic recording medium includes a charge retentive layer located on a conductive substrate. An image recording surface on the charge retentive layer includes an array of discrete, conductive segments present in the image recording surface. A multiple electrode assembly having an array of recording...http://www.google.co.uk/patents/US6362845?utm_source=gb-gplus-sharePatent US6362845 - Method and apparatus for electrostatographic printing utilizing an electrode array and a charge retentive imaging member
