Thermal drop-on-demand ink jet print head
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United States of America Patent
Stats
-
Sep 26, 1989
Grant Date -
N/A
app pub date -
Jul 28, 1988
filing date -
Jul 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An array of resistive heater elements, each of which is connected in an electrical circuit between a common electrode and one of the control electrodes. Each of the resistive heater elements comprises a plurality of portions arranged so that a small elongated opening in provided at the middle of the heater element where no resistive material is present. Each of the resistive heater elements, when energized, has a bubble formed at each of the plurality of portions. All of the bubbles coalesce to form a single pillow-shaped bubble which causes a drop of ink to be ejected from the associated nozzle. During collapse of the bubble, the bubble collapses inwardly so that cavitational shock impacts the heater element at the opening and little or no damage to the resistive heater is produced.
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