Electrostatic recording device
AssigneeU.S. Philips Corporation
InventorUlf Rothgordt
Life of this patent
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Abstract
An electrostatic recording device in which an area on a record carrier is charged electrically. Electrodes are arranged on both sides of the carrier. The print electrodes arranged in groups on one side thereof serve to form the desirable charge image. The counter electrodes on the other side, serve to select the desirable print electrode group. The counter electrodes being arranged in spaced opposing relationship with portions of two groups of print electrodes. The print electrodes are arranged in even and odd groupings, with each alternating group set being electrically connected.
Claims5
An electrographic recording system for recording on a record medium having a charge retentive surface, said system comprising:
- a plurality of arrays of recording electrodes, with each recording electrode mounted with an area thereof in close proximity to said charge retentive surface;
- circuit means interconnecting like-numbered recording electrodes of separated arrays to establish at least two electrically independent groups of arryas, with each array of each group separated from every other array of said group by at least one array of another group;
- a plurality of complementary electrodes mounted with an area of each in electrical cooperative relationship with said record medium, each complementary electrode being mounted adjacent to a single array of a group of arrays and spaced from all other arrays of said group by at least a portion of an array of another group;
- means for applying a first voltage of one polarity to any selected recording electrode;
- means for applying a second voltage of opposite polarity to at least one complementary electrode adjacent to the selected recording electrode, in coincidence with said first voltage and wherein the record medium is threaded between the recording electrodes and the complementary electrodes and is in intimate contact with the complementary electrodes.
An electrographic recording system for recording on a record medium having a charge retentive surface said system comprising:
- a plurality of arrays of recording electrodes, with each recording electrode mounted with an area thereof in close proximity to said charge retentive surface;
- circuit means interconnecting like-numbered recording electrodes of separated arrays to establish at least two electrically independent groups of arrays, with each array of each group separated from ever other array of said group by at least one array of another group;
- a plurality of complementary electrodes mounted with an area of each in electrical cooperative relationship with said record medium, each complementary electrode being mounted adjacent to a single array of a group of arrays and spaced from all other arrays of said group by at least a portion of an array of another group;
- means for applying a first voltage of one polarity to any selected recording electrode;
- means for applying a second voltage of opposite polarity to at least one complementary electrode adjacent to the selected recording electrode, in coincidence with said first voltage and wherein the record medium has a conductive portion which is not held at ground potential, and the complementary electrodes are mounted in electrical contact with the conductive portion of the record medium.
Dependencies are inferred from the claim text.