Thick-film thermal printing head and method of manufacturing the same

摘要

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.