......DE....FRGB..................................R0454133EUROPEAN PATENT APPLICATIONA319930113EP91106720.519910425enenen113879/9019900426JP113880/9019900426JP19930113199302199110301991445 5H 01C 17/22 A 5B 41J 2/345 BdeTrimmvorrichtung für thermischen Druckkopf und Verfahren zum Trimmen des Widerstandes eines thermischen DruckkopfesenThermal print head trimming apparatus and method for trimming resistance of a thermal print headfrDispositif pour l'ajustage d'une tête d'impression thermique et méthode pour ajuster la résistance d'une tête d'impression thermique1MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.00216883U241M(Dr.S/we)1006, Oaza KadomaKadoma-shi, Osaka-fu, 571JPYoshiike, Nobuyuki3-17, Asukano-Kita 3-chomeIkoma City, 630-01JPWatanabe, Yoshihiro20-19, Taishibashi 1-chomeAsahi-ku, Osaka City 535JPDr. Elisabeth Jung Dr. Jürgen Schirdewahn Dipl.-Ing. Claus Gernhardt00100421Postfach 40 14 6880714 MünchenDEDEFRGB19930113199302

A thermal print head trimming apparatus trims the resistances of heating resistor elements (4a). The apparatus divides the measured resistance data into plural groups by their variation range, and applies pulse signal of high-voltage by a probe electrode (6) to the heating resistor elements (4a) in the plural groups except a group that includes the lowest resistance values of the heating resistor elements (4a). Thereby the whole resistances of the heating resistor elements (4a) in the thermal print head are trimmed to agree with the lowest resistance values.