Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1997-07-14
2000-09-12
Le, N.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 40, 347 14, B41J 221, B41J 2145, B41J 215, B41J 2938
Patent
active
061167207
ABSTRACT:
A head for discharging yellow ink, magenta ink, cyan ink and first black ink having a relatively fast penetration velocity to a recording medium and a head for discharging second black ink having a relatively low penetration velocity are used to print an image. When a black image is adjacent to a color image, the black image is formed by using the first black ink, and when the black image is not adjacent to the color image, the black image is formed by using the second black ink. A black ink and a plurality of color inks having a different penetration velocity to a recording medium than that of the black ink are also used to print an image. Whether a color image area is present in the vicinity of a black image area of record data or not is determined, and whether the black image area is to be formed by the black ink or by the color inks is decided in accordance with the determination result, and when the black image is to be formed by the color inks, the color inks are used based on a mask pattern pseudo-randomly prepared to make the change in tonality less recognizable.
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Arai Atsushi
Ebisawa Isao
Inui Toshiharu
Iwasaki Osamu
Kanematsu Daigoro
Canon Kabushiki Kaisha
Le N.
Nguyen Thinh
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