Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1994-03-21
1997-08-19
Tran, Huan H.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
298901, 347 20, 347 54, 347 45, 347 47, 347 69, 347 70, 347 71, 347 72, 347 88, 347 92, 347 67, B41J 214, B41J 216
Patent
active
056593465
ABSTRACT:
In the embodiments of the simplified ink jet head described in the specification, a carbon plate is formed with orifice passages extending through the plate, pressure chambers on one side of the plate, flow-through passages on the other side of the plate and ink supply passages, and a piezoelectric plate having a conductive coating on the exposed side is affixed to the pressure chamber side of the carbon plate by a thin layer of epoxy adhesive. The conductive coating on the piezoelectric plate is photo-etched to produce an electrode pattern corresponding to the pattern of the pressure chambers in the carbon plate, and an orifice plate is affixed by a thin layer of epoxy adhesive to the opposite surface of the carbon plate with orifices aligned with the orifice passages in the carbon plate. Since the carbon plate is conductive, it can be used, if desired, as an electrode on the opposite side of the piezoelectric plate and, since it is porous, it can provide a communication path between a vacuum source and an air-permeable, ink-impermeable layer on the ink passages to remove dissolved air from the ink in the passages. In one alternative embodiment, the orifice passages are formed in an edge of the plate and, in another alternative embodiment, a large plate is provided on one surface with a number of adjacent piezoelectric plates.
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Gailus David W.
Hoisington Paul A.
Moynihan Edward R.
Palifka Robert G.
Spectra Inc.
Tran Huan H.
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