Patent ID: 7347537
Filing Date: 2008-03-25
Classification: B41J

Abstract:
1. An ink jet printhead comprising: a plurality of nozzles; and at least one respective heater element corresponding to each nozzle, wherein each heater element is arranged to be 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 an ejectable liquid through the nozzle corresponding to that heater element, and each heater element is configured such that an actuation energy of less than 180 nanojoules (nJ) is required to be applied to that heater element to heat that heater element sufficiently to form a bubble in the bubble forming liquid thereby to cause the ejection of a drop of the ejectable liquid through a nozzle, the actuation energy being applied as an electrical pulse having a duration less than 2 microseconds.