BLOCK-DIVIDED DRIVING APPARATUS OF GRADATION THERMAL PRINTHEAD

A thermal recording apparatus having a thermal head including a plurality of heating element groups each of which consists of a plurality of heating elements driven simultaneously and arranged in a row is so improved that it can record images without forming printing gaps. The apparatus has a drivin...

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Bibliographische Detailangaben
Hauptverfasser:	ITO, TAICHI, TSUKUDA, MASATO
Format:	Patent
Sprache:	eng
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A thermal recording apparatus having a thermal head including a plurality of heating element groups each of which consists of a plurality of heating elements driven simultaneously and arranged in a row is so improved that it can record images without forming printing gaps. The apparatus has a driving unit for producing driving signals indicative of tones of the image data of pixels to drive the heating elements. The pixels correspond to the heating elements, respectively. The period of time of driving the heating elements is varied in accordance with the tones. The driving unit comprises a modification circuit for modifying the period of time of driving at least one of the heating elements which is disposed at each of both ends of each of the heating element groups.