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. 16, 1983
Filed:
May. 21, 1981
Joseph J Bakewell, Boxford, MA (US);
Dynamics Research Corporation, Wilmington, MA (US);
Abstract
A high resolution thermal print head and method of fabrication is provided in which resistive elements are located at the edge of a dielectric support which functions as a spacer and is sandwiched between opposing substrates which carry vertically running electrodes on their inner faces. The electrodes extend to the edge of the spacer where they make electrical contact with opposing sides of the resistive elements. In one embodiment, the resistive elements are recessed into the edge of the spacer to minimize wear. The edge-on contact provided by the print head with the printing paper provides that all the supporting circuitry is orthogonal to the plane of the paper. In one embodiment, the spacer is provided with channels for coolant which is circulated immediately beneath the resistive elements. In another embodiment, the writing surface of the print head is ground down over opposing electrodes to expose the tops of the electrodes and to provide channels at the positions where resistive elements are to be placed, with resistive material deposited in the channels and then ground off to the desired head configuration. Only that portion of a resistive material lying between the exposed opposing electrodes is heated upon the application of power to the electrodes.