Improvements in thermal ink jet printheads

The temperature of a thermal ink jet and thermal printhead are controlled that the quality of black and white printing, gray-scale printing, and colour printing are improved. The methods control the average residual power of the columns of resistors (32,42) so that the average residual power of an a...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	YEUNG, KING-WAH W
Format:	Patent
Sprache:	eng ; fre ; ger
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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The temperature of a thermal ink jet and thermal printhead are controlled that the quality of black and white printing, gray-scale printing, and colour printing are improved. The methods control the average residual power of the columns of resistors (32,42) so that the average residual power of an addressed column (32) has a prescribed relationship to the average residual power of an unaddressed column (42). This is achieved by altering the magnitude of the drive voltages that drive the unaddressed resistors (34) of the printhead matrix (36) or by using nonprinting pulses. Methods for measuring the efficiency of the printhead are also presented.