Inkjet print head with flow control manifold and columnar struct

Details Inkjet print head with flow control manifold and columnar struct Inkjet print head with flow control manifold and columnar struct

1999-08-30

2000-10-17

Metjahic, Safet

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 65, B41J 205

Patent

active

061320331

ABSTRACT:
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.

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Aden, J. Stephen, et al., "The Third-Generation HP thermal InkJet Printhead," Hewlett-Packard Journal, Feb. 1994, 41-45.
Askeland, Ronald A., et al., "The Second-Generation Thermal InkJet Structure," Hewlett-Packard Journal, Aug. 1998, 28-31.
Buskirk, William A., et al., "Development of a High-Resolution Thermal Inkjet Printhead," Hewlett-Packard Journal, Oct. 1988, 55-61.

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