US 6,719,405 B1
Inkjet printhead having convex wall bubble chamberGeneral
US 6,719,405 B1
Inkjet printhead having convex wall bubble chamber
Tech Center:
2800 Semiconductors/Memory, Circuits/Measuring and Testing, Optics/Photocopying, Printing/Measuring and Testing
Examiner:
Michael S. Brooke
Art Unit:
2853 Printing/Measuring and Testing
Agent:
Inventors:
James H. Powers
Assignee:
Priority:
03/25/03
Filed:
03/25/03
Granted:
04/13/04
Expiration:
04/03/23
Abstract
In an inkjet printhead, a substantially rectangular heater element has a length and width dimension defining an aspect ratio of more than about 2.0. A bubble chamber with a curved or convex wall portion partially surrounds the heater element. A radius of an arc defining the convex wall portion is greater than one-half the width dimension while less than one-half the length dimension and none of the convex wall portion overlies a periphery of the heater element. An ink ejection orifice exists through a thickness of a nozzle plate covering the bubble chamber and resides above the heater element. Additionally, the bubble chamber may have a rectangular wall portion connected to the convex wall portion and either portion may occupy a terminal end of the bubble chamber. Preferred length and width dimensions include 35 and 13 or 40 and 10 microns with a radius of about 16 microns.