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:
Jan. 14, 1992
Filed:
Sep. 18, 1990
Lowell E Thomas, Tewksbury, MA (US);
Dynamics Research Corporation, Wilmington, MA (US);
Abstract
A true edge thermal printhead and method of fabrication wherein the printhead infrastructure is formed by thick film techniques and the individual laminations are formed in a predetermined order. The printhead infrastructure includes a dielectric substrate, a common electrode layer, a high temperature glaze, an electrode pattern, a low temperature glaze and a plurality of resistive heating elements formed on the edge of the infrastructure and interconnected to the electrode pattern and the common electrode layer. The common electrode layer is a unitary sheet of refractory conductive material that is compatible with the high firing temperatures required for the high temperature glaze, and includes multiple ground taps. The fine image electrode pattern is compatible with the reduced firing temperature of the low temperature glaze such that gold pastes may be efficaciously utilized in the formation of the electrode pattern. Driver chips for activating the resistive heating elements are mounted in the printhead infrastructure to enhance printhead performance. Thermistors may be mounted on the glaze and/or substrate to monitor printhead temperature.