High speed thin film stressed membrane print head

Details High speed thin film stressed membrane print head High speed thin film stressed membrane print head

1997-10-27

2000-06-27

Barlow, John

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 204

Patent

active

060798130

ABSTRACT:
This invention relates to a high speed print head for an inkjet printer which involves the integration of stressed thin film technology. The stressed thin film is applied over a basic substrate and some cavities are etched underneath the film creating a membrane film which has the tendency to bulge outward over cavity areas under the effect of its internal compressed forces. The membrane film, and the bottom of the cavity, have electrodes deposited. An electric signal corresponding with input data is applied to two electrodes creating an electric field between electrodes. As a result, the membrane film is attracted and repelled against the fixed cavity bottom, following the electric signal and providing a variation of an adjacent ink chamber's volume ejecting an ink drop. In its displacement, the membrane film snaps, after passing the zone where the force created by the electric field adds to the internal compressed forces of the film, accelerating its displacement from one stable position into another. This process acts in both directions of membrane movement. In a first embodiment of this invention, the ink drop is ejected perpendicular to the membrane displacement, while in the second embodiment the ink drop is ejected in a parallel direction to the membrane displacement. The invention increases the printing speed and quality, improves the ink flow and eliminates print head nozzles clogging, thus ensuring compatibility with different ink types, and also reducing the print head size and cost.

REFERENCES:
patent: 5825383 (1998-10-01), Abe et al.

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