The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 28, 2010
Filed:
Jun. 12, 2008
Kia Silverbrook, Balmain, AU;
Gregory John Mcavoy, Balmain, AU;
Angus John North, Balmain, AU;
Samuel George Mallinson, Balmain, AU;
Mehdi Azimi, Balmain, AU;
Paul Justin Reichl, Balmain, AU;
Kia Silverbrook, Balmain, AU;
Gregory John McAvoy, Balmain, AU;
Angus John North, Balmain, AU;
Samuel George Mallinson, Balmain, AU;
Mehdi Azimi, Balmain, AU;
Paul Justin Reichl, Balmain, AU;
Silverbrook Research Pty Ltd, Balmain, New South Wales, AU;
Abstract
An inkjet printhead is provided having nozzles, bubble forming chambers containing ejectable ink, generally planar heater elements each bonded on one side to an associated chamber so that the other side faces into the chamber, a MEMS fluid sensor having a MEMS sensing element for detecting the presence or otherwise of the ejectable ink in the chamber, and control circuitry for measuring the current passing through the sensing element during its heating. The heater elements receive heating pulses to form gas bubbles in the ejectable ink on the side facing into the chamber which cause ink ejection from the nozzle. Each chamber has a dielectric layer proximate the side of the heater element which has a thermal product less than 1495 JmKs, the thermal product being (ρCk), where ρ is the density of the layer, C is specific heat of the layer and k is thermal conductivity of the layer.