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:
May. 20, 1980
Filed:
May. 31, 1978
Nippon Electric Co., Ltd., Tokyo, JP;
Abstract
A thermal printing head which effects printing on thermally sensitive paper with Joule's heat generated by passing a current through a thick-film resistor is featured by the surface configuration of the thick-film resistor. In a cross-section perpendicular to the direction of the current passing through the resistor, the resistor is formed in such shape that the center portion is lower than the opposite edge portions. Owing to such concave top surface, despite of the fact that the heating resistor is a thick-film resistor, printing of high quality that is compatible to printing quality by a thin-film resistor can be accomplished. A practically useful thermal head having the resistors with the concave top surface can be realized through the photo-resist pattern technique combined with the screen printing technique.