US Patent 7284839 Inkjet printhead with low power ink vaporizing heaters

There is disclosed an ink jet printhead which comprises a plurality of nozzles and one or more heater elements 10 corresponding to each nozzle. Each heater element 10 is configured to heat a bubble forming liquid 11 in the printhead to a temperature above its boiling point to form a gas bubble 12 therein. The generation of the bubble 12 causes the ejection of a drop of an ejectable liquid (such as ink) through an ejection aperture 5 in each nozzle, to effect printing. In each nozzle, the heater element 10 requires less than 8 volts and a current of less than 60 milliamps for less than 1.5 microseconds, in order to form the gas bubble 12 that causes the ejection of the drop of ejectable liquid 11.