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US 4,364,071 AGranted
Electrographic recording
AssigneeHoneywell Inc.
InventorDonald E. Shafer
Life of this patent
Estimating the term…
Abstract
In an electrographic recorder of the type wherein a dynamic toner bridge is formed between a rotating shell and a permeable strip positioned a predetermined small distance from the periphery of the shell, to define a recording station, means are provided for varying the magnetic field defining the toner bridge by varying the intensity of the defining magnetic field.
Claims6
An electrographic recording system for recording information on an electrographic recording medium comprising
- a non-magnetic platen over which said recording medium passes;
- a multipolar magnetic structure;
- a non-magnetic shell;
- means mounting said shell for motion about said magnetic structure with the peripheral surface of said shell spaced a small predetermined distance above said platen
- means for supplying magnetic toner particles to the outer surface of said shell
- a magnetically permeable member positioned substantially in the plane of said platen and extending parallel to the rotational axis of said shell, defining a recording station, said magnetically permeable member concentrating the magnetic field produced by said magnetic structure to form a dynamic bridge of toner particles between said shell and said recording medium at said recording station;
- means for superimposing a selectively variable magnetic field on said permeable member whereby to selectively vary the definition of said dynamic bridge;
- a portion of said platen being electrically conductive;
- an array of recording electrodes spaced between the peripheral surface of said shell and said platen with the extremities of said electrodes positioned to conduct electrical energy to said toner particles in said bridge at said recording station.
6 more elements
Dependencies are inferred from the claim text.