Printhead substrate, printhead using the substrate, head...

Details Printhead substrate, printhead using the substrate, head... Printhead substrate, printhead using the substrate, head...

2007-03-23

2009-08-18

Stephens, Juanita D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S059000, C257S204000

Reexamination Certificate

active

07575294

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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