Patent ID: 8052250
Filing Date: 2011-11-08
Classification: B41J

Abstract:
1. An inkjet printer comprising: an array of ink chambers, each ink chamber having a nozzle opening, a droplet stem anchor and a thermal actuator for generating a vapour bubble in the ink chamber to eject ink through the nozzle opening, wherein the ink ejected from the nozzle opening is attached to the droplet stem anchor by an ink stem until the ink stem breaks and the ejected ink forms a separate drop; wherein, the nozzle openings are elliptical and the droplet stem anchors are at the centre of respective elliptical nozzle openings, proximate the plane of the respective elliptical nozzle openings, the thermal actuator has two heater elements in parallel and a cross bracing structure extending between the two heater elements, the cross bracing structure being a single beam with a surface irregularity to locate the droplet stem actuator.