THERMAL INK JET PRINTHEAD WITH SUSPENDED BEAM HEATER

摘要

There is disclosed an ink jet printhead which comprises a plurality of nozzl es (3) and one or more heater elements (10) corresponding to each nozzle. Each heater element is configured to heat a bubble (12) forming liquid in the printhead to a temperature above its boiling point to form a gas bubble therein. The generation of the bubble causes the ejection of a drop (16) of an ejectable liquid (such as ink) through respective corresponding nozzle, to effect printing. Each heater element is in the form of a beam suspended over at least a portion of the bubble forming liquid so as to be in thermal conta ct therewith. This configuration of printhead provides for a relatively high efficiency of operation.