Method of driving a printhead using a constant current and operating MOS transistor in saturation region
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United States of America Patent
Stats
-
May 15, 2007
Grant Date -
Jun 30, 2005
app pub date -
Nov 4, 2004
filing date -
Nov 6, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a printhead substrate capable of suppressing an increase in wiring width and an increase in the size of a substrate formed by a film forming process while increasing the number of simultaneously driven printing elements in order to improve the printing performance, a printhead using the substrate, and a printing apparatus using the printhead. The wiring lines of the substrate are formed into a common wiring line, and energy applied to a heating resistance element is prevented from deviating from a stable ink discharge range owing to the difference in the number of simultaneously driven heating resistance elements. For this purpose, a driving element is greatly downsized in comparison with a conventional one, and the operation region of a MOS transistor is shifted from the non-saturation region to the saturation region.
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