Electrographic a term used for punched card technology that allowed cards marked with a pencil to be converted into punched cards. That technology was sold by IBM, its developer, under the term mark sense. A "mark sense pencil lead" sold by IBM would meet federal specifications for "electrographic lead." International Business Machines Corporation (IBM, or colloquially, Big Blue) (NYSE: IBM) (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, New York, USA. The company manufactures and sells computer hardware, software, and services. ... Mark sense is a trade name used by IBM for punched card technology that allowed cards marked with a pencil to be converted into punched cards. ... International Business Machines Corporation (IBM, or colloquially, Big Blue) (NYSE: IBM) (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, New York, USA. The company manufactures and sells computer hardware, software, and services. ...
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The electrographic printing apparatus claimed in claim 1, wherein the driver circuitry and logic and control means are separate integrated circuits that are attached to the back of the substrate.
In electrographic printers utilizing a plurality of transfer electrodes, such as printers with wide-format print heads for fast writing speeds or high resolution print heads for high image quality, a large number of transfer electrodes, interconnects, and voltage sources are required.
Thus, there is clearly a need for an electrographic print head that incorporates a large number of transfer electrodes and their associated interconnects and drive electronics in a cost-effective, compact, and manufacturable manner that does not force compromises in system design.
An improved electrographic writing head according to claim 1 wherein said pull up resistor means have an impedance in a range from 5 to 10 mega ohms.
An improved electrographic writing head according to claim 1 wherein said shielding means comprises a continuous plane of conducting material having a connection with ground.
This invention relates to electrographic writing heads for recording information on a dielectric recording medium and in particular to an improved electrographic writing head employing interleaved arrays of writing nibs, small geometry thick film resistors and semiconductor driver circuits fabricated on adjacent glass epoxy substrates separated by a ground plane.
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