Printhead driving method, printhead substrate, printhead, head cartridge, and printing apparatus
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United States of America Patent
Stats
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Aug 23, 2011
Grant Date -
Jan 31, 2008
app pub date -
Oct 1, 2007
filing date -
Nov 6, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An increase in energy applied to a heating element can be prevented and the service life of a printhead can be prolonged even when the temperature of the printing element having a negative temperature coefficient rises and the resistance of the heating element decreases. A printhead having heating elements connected to a common power supply comprises a switching element series-connected to and controlling driving of the heating element at a voltage applied to a control terminal; a constant voltage source; a wiring resistance generated at a connection wiring line serial-connected to the heating element; and a voltage control circuit which controls to make the potential difference between both ends of the wiring resistance equal to the voltage of the constant voltage source when driving the heating element. A current flowing through the heating element is made constant without any influence of the temperature.
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