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AssigneeRastergraphics, Inc.
InventorsAndreas Bibl, George H. Fellingham
Estimating the term…
An improved electrographic writing head employs interleaved arrays of writing nibs and small geometry, high impedance, thick film resistors and semiconductor driver circuits fabricated on a glass epoxy substrate. The writing head achieves significant savings in manufacturing costs by using low cost printed circuit and thick film technology. Power consumption may be reduced by more than half over prior art devices due to the high impedance of each thick film pull up resistor coupled with a associated writing neb. A ground plane is disposed internally of the substrate and between adjacent arrays of writing nibs. The ground plane prevents electrical interaction between the substrates and prevents the formation of parasitic nib-to-nib capacitance by shunting parasitic capacitance currents to ground. The ground plane thus reduces the possibility of flaring and substantially eliminates inadvertent writing by adjacent nibs.
A method for forming an electrographic writing head from a single planar substrate having opposite major surfaces including an array of writing nibs, a corresponding high impedance nib resistor and high voltage pull-up resistor associated with each nib of said array of writing nibs disposed on each of said opposite surfaces of the substrate comprising the steps of:
A method for forming an electrostatic writing head or the like from a single substrate including an array of writing nibs, corresponding nib resistors and pull-up resistors on each surface of said single substrate wherein each writing nib forms a dot of electrostatic charge on a recording medium and each writing nib has a connection with a corresponding nib resistor and high voltage pull-up resistor comprising the steps of:
Dependencies are inferred from the claim text.