Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1997-07-09
1999-11-30
Barlow, John
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 7, B41J 205
Patent
active
059929847
ABSTRACT:
This invention provides, in a novel liquid discharge method utilizing a movable member, a configuration for detecting presence or absence of liquid in the liquid path or discharge state of the liquid. In an embodiment of this invention, the element substrate of the liquid discharge head is rendered electrically conductive and a partition wall for separating a liquid path for the liquid to be discharged and a liquid path for generating energy for liquid discharge upon heating is also rendered electrically conductive, and a detecting pulse is applied to the partition wall to detect the difference in potential or the variation in electrostatic capacitance between the element substrate and the partition wall, whereby the presence or absence of liquid in the small liquid path is detected.
Also in another embodiment, the electrostatic capacitance between a fixed electrode provided in a fixed position of the liquid discharge head and a movable electrode provided on the movable member is detected, and the discharge state of the liquid is judged according to the function state of the movable member.
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Asakawa Yoshie
Imanaka Yoshiyuki
Kashino Toshio
Koyama Shuji
Shimizu Masashi
Barlow John
Canon Kabushiki Kaisha
Stephens Juanita
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