Patent ID: 6672709
Filing Date: 2004-01-06
Classification: B41J

Abstract:
An ink jet printhead comprising:a plurality of nozzles; and at least one respective heater element corresponding to each nozzle, wherein the printhead is configured to receive a supply of an ejectable liquid at an ambient temperature, and wherein each heater element is arranged for being in thermal contact with a bubble forming liquid, each heater element is configured to heat at least part of the bubble forming liquid to a temperature above its boiling point to form a gas bubble therein thereby to cause the ejection of a drop of the ejectable liquid through the corresponding nozzle; and each heater element is configured such that the energy required to be applied thereto to heat said part to cause the ejection of a said drop is less than the energy required to heat a volume of said ejectable liquid equal to the volume of a said drop, from a temperature equal to said ambient temperature to said boiling point.