The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 1997
Filed:
Mar. 21, 1994
Edward R Moynihan, Plainfield, NH (US);
David W Gailus, Merrimack, NH (US);
Robert G Palifka, Orford, NH (US);
Paul A Hoisington, Norwich, VT (US);
Spectra, Inc., Keene, NH (US);
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.