Electrographic recording
AssigneeHoneywell Inc.
InventorRoger D. Erickson
Life of this patent
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Abstract
In an electrographic recording system wherein a dynamic bridge of toner particles, the particles having electrical and magnetic properties, corresponding to a concentrated magnetic field formed between a toner carrier and the recording medium, an improved stylus array is provided. The stylus array includes a thin strip of magnetically permeable material secured to the undersurface of the stylus array but insulated from the styli, themselves. The permeable strip tends to modify the configuration of the magnetic field, pulling the toner bridge into intimate contact with the tips of the styli.
Claims7
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;
- means for defining a recording station substantially at the position of nearest approach of said shell to the upper surface of said platen;
- an array of recording styli positioned at said recording station and spaced between the peripheral surface of said shell and said platen;
- said means for defining a recording station including a magnetically permeable strip secured to but insulated from the under surface of said array of recording styli, said magnetically permeable strip 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.
In an electrographic recording system for recording information on a recording medium wherein a dynamic bridge of toner particles having electrical and magnetic properties is formed corresponding to a concentrated magnetic field formed between a toner carrier and the recording medium, the improvement comprising a stylus array structure having stylus tips in physical and electrical contact with said toner particles in said bridge, and a magnetically permeable strip member secured to but insulated from the lower surface of the styli in said array whereby to draw said toner particles in said bridge into intimate contact with said stylus tips.
Dependencies are inferred from the claim text.