Datametrics Corp.

William L Grummer

Clifton A Blake, Jr

An improved thermal printhead is disclosed which includes a plurality of addressable electrodes, each corresponding to a spot to be printed. In alternative embodiments, a single common electrode or a plurality of common electrodes are located in a plane below that of the addressable electrodes and are separated therefrom by an insulating layer. A portion of the common electrode is left exposed in the vicinity of each of the addressable electrodes and a covering of thermal resistive material electrically interconnects the two types of electrodes. Passage of a current through an addressable electrodes result in a current flow to the nearest points on a common electrode causing local heating in the resistive material. The electrode arrangement permits printing closer to the edge of the printhead and further, enables smaller, more clearly spaced printed 'dots'.

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Canyon Country, CA, United States of America

William L Grummer