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MLC Technology for Print Head Transducers

IP.com Disclosure Number: IPCOM000045960D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 30K

Publishing Venue

IBM

Related People

Scranton, RA: AUTHOR [+2]

Abstract

A stylus print head array for a magnetic toner printer includes thousands of wires at a density of hundreds/inch. The styli are fabricated by patterning molybdenum paste onto ceramic green sheets by means of screen printing. Multilayered ceramic (MLC) technology is employed with the conductors comprising conductors made from conductive paste material fired with the MLC material. Integrated circuit driving circuits are attached to the substrate and connected to the array by means of connections to C4 solder-ball-type pads and welded pins.

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MLC Technology for Print Head Transducers

A stylus print head array for a magnetic toner printer includes thousands of wires at a density of hundreds/inch. The styli are fabricated by patterning molybdenum paste onto ceramic green sheets by means of screen printing. Multilayered ceramic (MLC) technology is employed with the conductors comprising conductors made from conductive paste material fired with the MLC material. Integrated circuit driving circuits are attached to the substrate and connected to the array by means of connections to C4 solder-ball-type pads and welded pins.

The magnetic printing system involves an array of electrodes juxtaposed with a magnetic structure where there is a substrate supporting the electrodes and the magnetic structure. The substrate is composed of an MLC material, and the conductors comprise conductive paste material fired with the MLC.

This printing process uses a fine chain of toner particles magnetically attracted to paper which is selectively charged electrostatically. Toner particles are attracted to the paper by the electrostatic charge and fused subsequently. Problems in implementing the printing scheme are to fabricate a large number of magnetically permeable electrodes economically on a durable insulator and to attach an integrated circuit driver to each electrode reliably.

The process for constructing a linear array of individually driven electrodes includes:

1) An alumina green sheet l0 is patterned with molybdenum paste ll by screen printing. The pattern consists of a number of conductor lines ll, routed from the edge l2 of the sheet l0 to pads l4. Each pad l4 corresponds to the solder ball position (C4) of an integrated circuit. Additional conductor lines correspond to connections between the integrated circuits (not shown) and inputs to the integrated circuits. 2) The green sh...