Hewlett-packard Company

Hewlett-packard Development Company, L.P.

Robert N Browning

Joseph M Torgerson

Michael D Miller

Angela White Bakkom

Mark H Mackenzie

Michael W Cumbie

Storrs Townsend Hoen

Simon Dodd

Leslie Ann Field

Ralph L Stathem

Phillip W Barth

Matt G Driggers

Todd A Cleland

Robert C Maze

Michael B Hager

Mark Daniel Tucker

Patrick G Mahoney

Douglas M Collins

An ink jet print head with a substrate defining an ink aperture. A number of ink energizing elements are located on the major surface of the substrate. A barrier layer is connected to the upper surface, and peripherally encloses an ink manifold. The barrier encompasses the ink aperture. An orifice plate is connected to the barrier layer, spaced apart from the substrate's major surface, enclosing the ink manifold. The plate defines a number of orifices, each associated with a respective ink energizing element. The ink manifold is an elongated chamber having opposed ends defined by end wall portions of the barrier layer. The barrier end wall portions each have an intermediate end wall portion protruding into the manifold. Columnar structures placed at predetermined locations, including locations at the end of the ink aperture, and extending from the major surface to the orifice plate control the migration of coalescing bubbles.

Inkjet print head with flow control manifold and columnar structures

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Corvallis, OR, United States of America

Robert N Browning