Patent ID: 7591549
Filing Date: 2009-09-22
Classification: B41J

Abstract:
1. A method for purging bubbles from a fluid chamber of a micro-fluid ejection head containing a plurality of fluid chambers, an ejection actuator respectively associated with each of the fluid chambers, and a common fluid supply area for the fluid chambers, the method comprising: pulsing one or more of the ejection actuators with energy sufficient to expand a bubble present in one of the fluid chambers without substantially boiling the fluid in the common fluid supply area; maintaining a first temperature of the ejection head for a first period of time during bubble expansion so that the bubble in the fluid chamber is urged away from the fluid chamber in the absence of applying a pressure to the fluid chamber; and decreasing the ejection head temperature over a second period of time to lower the ejection head temperature to a second temperature lower then the first temperature.