Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2008-03-07
2009-11-03
Luu, Matthew (Department: 2861)
Incremental printing of symbolic information
Ink jet
Controller
Reexamination Certificate
active
07611221
ABSTRACT:
The liquid ejection apparatus comprises: a liquid ejection head having a plurality of ejection ports which eject droplets of liquid; a light emitting device which emits a determination light beam intersecting with flight paths of the droplets ejected from at least two of the ejection ports to be examined; a light receiving device which receives the determination light beam having passed through the flight paths of the droplets and outputs a determination signal corresponding to an amount of received light; an ejection port selection device which selects the at least two of the ejection ports to be examined so that the at least two of the ejection ports are disposed on a line parallel to an optical axis of the determination light beam, and that a distance between the at least two of the ejection ports along the optical axis of the determination light beam is smaller than a prescribed specific distance; an ejection control device which performs ejection driving to eject the droplets at substantially same time from the at least two ejection ports selected by the ejection port selection device; and an ejection state judgment device which judges droplet ejection state of the at least two ejection ports according to the determination signal outputted by the light receiving device when the droplets ejected due to the ejection driving performed by the ejection control device pass through the determination light beam.
REFERENCES:
patent: 2003/0090534 (2003-05-01), Valero et al.
patent: 2004/0196319 (2004-10-01), Aruga
patent: 2005/0122360 (2005-06-01), Sakagami et al.
patent: 10-296982 (1998-11-01), None
patent: 2002-361863 (2002-12-01), None
patent: 2003-191453 (2003-07-01), None
Kusakari Tsutomu
Takatsuka Tsutomu
Birch, Stewart, Kolasch and Birch LLP
Fuji Photo Film Co. , Ltd.
Luu Matthew
Seo Justin
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