Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2008-07-08
2008-07-08
Nguyen, Lamson D. (Department: 2861)
Incremental printing of symbolic information
Ink jet
Controller
C347S014000, C347S041000
Reexamination Certificate
active
07396100
ABSTRACT:
There is provided an ink jet printing apparatus that suppresses density unevenness caused by a difference in print time resulting from printing based on a bidirectional multi-pass printing system. With a relatively small print medium width, the time difference unevenness does not occur even in 2 pass printing. Accordingly, the 2 pass printing is selected. With a relatively large print medium width, selection of the 2 pass printing may make the density unevenness significant. Accordingly, the density unevenness is suppressed by selecting 8 pass printing. That is, in the 8 pass printing, the same area is scanned eight times, which is four times as frequent as the twice in the 2 pass printing. This reduces the size of each area having different densities, while increasing a cycle frequency at which a high and low densities are alternately repeated. As a result, the time difference unevenness is not perceived easily.
REFERENCES:
patent: 6050674 (2000-04-01), Hirabayashi et al.
patent: 6669331 (2003-12-01), Teshigawara et al.
patent: 2002/0171709 (2002-11-01), Teshigawara et al.
patent: 2003-034021 (2003-02-01), None
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Nguyen Lamson D.
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